What are the Different Types of Conveyor Belts?

Conveyor belt, the English name conveying belt, also known as conveyor belt, is a rubber and fiber, metal composite product, or plastic and fabric composite product used in belt conveyors to carry and carry materials. Conveyor belts are widely used in cement, coking, metallurgy, chemical, steel and other industries where the transportation distance is short and the transportation volume is small.

Conveyor belts, conveyor belts are widely used in agriculture, industrial and mining enterprises and transportation industries to transport various solid block and powder materials or pieces. The conveyor belt can be transported continuously, efficiently, and at a large inclination. It is safe to operate, the conveyor belt is easy to use, easy to maintain, the freight is low, and it can shorten the transportation distance, reduce the engineering cost, and save manpower and material resources.

Conveyor belt, the English name conveying belt, also known as conveyor belt, is a rubber and fiber, metal composite product, or plastic and fabric composite product used in belt conveyors to carry and carry materials.

Conveyor belt strength standard

Ordinary conveyor belts comply with GB7984-2001 standards.

Ordinary conveyor belt: cover layer: tensile strength is not less than 15Mpa, elongation at break is not less than 350%, abrasion amount is less than or equal to 200mm3; average interlayer adhesion strength of longitudinal samples is not less than 3.2N / mm; covering rubber The distance from the cloth layer is not less than 2.1N / mm; the longitudinal elongation at full thickness is not less than 10%; the longitudinal reference force elongation at full thickness is not more than 1.5%.

Nylon (NN), polyester (EP) conveyor belt cover, tensile strength is not less than 15Mpa, elongation at break is not less than 350%, the average interlayer adhesive strength of longitudinal samples is not less than 4.5N / mm, covering rubber and cloth layer is not less than 3.2N / mm, full-length longitudinal breaking elongation is not less than 10%, full-thickness longitudinal reference force elongation is not more than 4%, covering rubber adopts rubber and plastic blending, skeleton The national standard level tensile strength coefficient can be overlapped into a ring.

Product Category

All conveyor belts must be connected in a ring to be used, so the quality of the conveyor belt joints directly affects the service life of the conveyor belt and whether the conveyor line can run smoothly. Common methods for conveyor belt joints are mechanical joints, cold bonded joints, and thermal vulcanized joints.

Conveyor belt mechanical joint method: Generally refers to the use of belt buckle joints. This joint method is convenient, convenient and relatively economical, but the efficiency of the joint is low and easily damaged, which has a certain impact on the service life of the conveyor belt products. Among the joints of PVC and PVG whole-core flame-retardant antistatic conveyor belts, this type of joint method is generally used for products below the level 8 belt.

Conveyor cold bonding head method: cold bonding adhesive is used for joints. This joint method is more efficient and more economical than mechanical joints, and should be able to have a better joint effect, but from a practical point of view, because of the difficult process conditions, and the quality of the adhesive has a great impact on the joint, So it is not very stable.

Conveyor belt thermal vulcanization joint method: It has been proved to be the most ideal joint method, which can ensure high joint efficiency, is also very stable, and has a long joint life, which is easy to grasp. However, there are disadvantages such as troublesome process, high cost and long joint time.

Cold vulcanization repair of conveyor belt

Cold vulcanization repair of conveyor belt

1. Grind the damaged part of the conveyor belt with an angle grinder and a tungsten steel grinding disc.

2. According to the size of the damaged part of the conveyor belt, select the corresponding repair belt or repair strip with a semi-vulcanized layer (the repair strip or patch is at least 15-20 mm larger than the damaged part). 3, repair sheet, material without semi-vulcanized layer is recommended to deep-grind the bonding surface.

3. Brush the damaged part of the conveyor belt and the semi-vulcanized surface of the repair strip of the conveyor belt, apply the belt glue, allow it to dry for a while, and then apply it for the second time (leave it dry until it is not sticky, usually at room temperature for five minutes) .

4. Straighten the repair strip to the abrasive surface of the conveyor belt, and use a rubber hammer or a compaction roller to perform compaction to drive out the air.

Tips: If the ambient temperature is too low, it is recommended to use an iodine tungsten lamp or a hot air gun for heating for 0.5-1 hour. If the time is allowed to extend the heating time properly, it will be beneficial to the strength of the bonding surface.

Conveyor belt hot vulcanization repair

1. According to the damage size of the conveyor belt, at least 15-20mm larger around the damage, draw a cutting repair line, cut it at an angle of 45 degrees, and peel off the damaged cover rubber. Be careful not to damage the underlying cloth layer or Steel wire layer.

2. Use an angle grinder with a tungsten steel grinding disc to perform deep grinding on the damaged part of the conveyor belt. It is recommended to grind 3mm.

3. Lay the polished conveyor belt with a fabric reinforcing layer or a steel wire reinforcing layer, apply thermal curing agent to the reinforcing layer and damaged parts, cut the periphery of the unvulcanized core rubber into oblique openings, and perform the same with the thermal curing agent. Brush and tile (the size of the unvulcanized face gel should be the same as the size of the damaged part).

4. Use hot vulcanizing repairer or vulcanizing machine to pressurize and heat vulcanize.

Tips: The temperature of the controller of the vulcanizing machine is controlled between 145-150 ° C. When the temperature of the upper and lower vulcanizing plates is stable, the vulcanization timer starts 35 ~ 45 minutes. (Depending on the thickness of the belt, each vulcanizing plate can vulcanize about 1mm of rubber every 4 minutes.) The vulcanizing machine water pressure can be released after the vulcanizing plate temperature drops below 70 ° C, and then the vulcanizing machine is removed.

Quick spray repair of conveyor belt

The conveyor belt quickly sprays repair materials. It has super strong adhesion, excellent abrasion resistance and excellent tensile properties, cohesive strength, tensile strength, peel strength and good hardness, toughness and elongation. Disassembly-free, heat-free vulcanization, fast repair of rubber conveyor belt scratches on site, low repair cost, short time, avoid major losses caused by scrap replacement and long-term shutdown, good self-leveling, bright appearance, can quickly repair damaged rubber Conveyor belts and rubber products can also be pre-coated with a protective layer on the product surface, and the repaired conveyor belt can fully reach the service life of the new conveyor.

With the popularity of conveyor belts in industrial production, multi-variety, high performance, light weight, multi-function, and long life are several aspects that manufacturers are concerned about. In industrial production, it is particularly important to use the conveyor belt correctly. The conveyor belt should pay attention to the following matters in use:

1. Avoid the rollers being covered by the material, which will cause the rotation to be ineffective and prevent the leaked material from getting stuck on the roller and

In the long-term use of the conveyor belt, it will inevitably encounter longitudinal tearing of the conveyor belt, cracking of the conveyor belt, and damage to the belt surface. We call it conventional damage to the conveyor belt. Every time I see this situation, it is very For the headache, if it is light, do some cold vulcanization repair, if it is heavy, you need to replace the belt and heat vulcanize the joint. Not only caused trouble to themselves, but more importantly caused unnecessary economic losses to the enterprise.

How to avoid these situations? Let us briefly analyze the reasons.

1. Reasons for longitudinal tearing of the conveyor belt:

(1) The vibration and shock caused the fasteners to loosen and fall off, causing the falling coal lining board, the material guide plate and the like to fall.

(2) Foreign matter is mixed in the material, the foreign matter is hard, has edges and corners, and the falling coal pipe is blocked and squeezed.

(3) The roller is missing, and the roller frame causes scratches.

(4) The conveyor belt was hung by the rack after it was seriously deflected.

(5) The cleaner is drawn into the drum (return cleaner), the bolts are loose, and there is a precursor of bouncing.

Second, the cause of cracked conveyor belt:

(1) Due to the limitation of space size, the number of bending times of the conveyor belt is large.

(2) The vulcanization of the joint has been vulcanized more than twice due to various reasons.

Third, the reasons for the tear of the vulcanized joint of the conveyor belt:

(1) The diameter of the redirecting roller is small, and the bending stress on the conveyor belt is large.

(2) The quality of the vulcanized joints of the conveyor belt is poor, especially if the vulcanized joints have been vulcanized more than twice, the joint strength is significantly reduced, or the canvas layer is cut off, or the wear is leaked during the bonding, and the strength is reduced here.

(3) For reversible conveyors, because they can only overlap in up and down directions, they can be easily scratched by the sharp corners of the cleaners and unloaders on the belt.

(4) Short working cycle of the conveyor, frequent starting and large instantaneous tension.

Fourth, the cause of damage to the rubber surface of the conveyor belt:

(1) The gap between the lining of the material guide groove and the tape is not suitable, causing abnormal wear, or foreign matter is embedded in the gap, causing abnormal wear or scratches.

(2) The material flow rate at the material guide groove is not consistent with the speed of the conveyor belt, the drop is large, and the rubber surface is accelerated to wear.

(3) The roller is damaged, causing abnormal wear or scratch of the tape.

(4) Irregular operations, slag burns during cleaning, and scratches on the cleaner.

(5) Slipping of the tape may cause abnormal wear of the tape.

During the use of the conveyor belt, the most common problems are: foreign object scratches, local foreign object damage, wear, and perforation.

Usually, the conveyor belt is locally damaged due to foreign objects. After being completely disassembled according to the traditional method, it is repaired and heated for vulcanization or scrapped and replaced.

It can be repaired with polymer rubber, which has super strong adhesion, excellent abrasion resistance and excellent tensile properties. Using polymer

During transportation and storage, the conveyor belt should be kept clean to avoid direct sunlight or rain and snow, and prevent contact with acids, alkalis, oils, organic solvents and other substances, and be one meter away from the heating device.

During storage, the temperature of the warehouse should be maintained between 18-40 , and the relative humidity should be maintained between 50-80%.

During storage, the conveyor belt must be placed in rolls and must not be folded. It should be turned once a quarter during the storage period.

Conveyor belts of different types and specifications should not be connected together, and the joints should preferably be glued together.

The type, structure, specifications, and number of layers of the conveyor belt should be reasonably selected according to the use conditions.

Generally, the running speed of the conveyor belt should not be greater than 2.5 meters per second. For materials with large block size and high abrasion and the use of fixed unloading devices, low speed should be used as far as possible.

The relationship between the diameter of the transmission roller of the conveyor and the layer of the conveyor belt,

1.Conveyor belt pricing unit

Layered conveyor belt: RMB / standard square meter

Wire rope core conveyor belt: Yuan / standard square meter

PVC and PVG flame retardant conveyor belt: RMB / natural square meter

2. Calculation method

Layered conveyor belt:

Standard square meters = Bandwidth (m) × (Number of cloth layers + (Upper rubber thickness + Lower rubber thickness) / 1.5) × Belt length (m)

Wire rope core conveyor belt:

Standard square meters = bandwidth (m) × product thickness (mm) / 1.5 × belt length (m)

The calculation of natural square meters of PVC and PVG flame retardant conveyor belts is the bandwidth × belt length.

1. Belt tear caused by impurities in conveying materials. The impurities in the conveyed materials are mainly for the coal port. The quality of the coal is not good. Large blocks of coal and various impurities in the raw coal, such as ironware and wood rods, cause about 70-80% tearing, thus ensuring the source coal. Quality is the key to tear resistance.

2. Belt tear caused by improper installation of auxiliary equipment of belt conveyor. There are many auxiliary equipment for belt conveyors. Dropping of linings, sharp irons adsorbed by iron removers, improper installation of cleaners, etc. may cause tearing and scraping of conveyor belts. Ordinary conveyor belts do not have lateral protection structures and cannot prevent tearing.

3. Belt tear caused by incomplete structure of belt conveyor. Because the structure of the belt conveyor is not perfect, the drop point of the conveyor belt is large, the relative speed of the impurities in the coal flow is large, the impact force is large, and the sharp and hard ultra-long impurities are easy to insert into the conveyor belt at the discharge point, causing The belt is torn.

4. Conveyor belt tear caused by blocked materials. The transfer chute is small, which easily hinders the passage of materials and impurities and causes the belt to tear.

5. Deviation of the conveyor belt causes ripping.

6, the return trip with rolled coal, etc.

In addition, the aging of the adhesive at the joints of the conveyor belt causes water to enter the core layer of the conveyor belt, which causes the steel wire to rust out and cause tearing.

1. According to the use of conveyor belt, it can be divided into:

Oil-proof, non-slip, climbing, anti-acid and alkali transportation conveyor.

2. The conveyor belt can be divided into:

PVC conveyor belt, PU conveyor belt, polyethylene conveyor belt, plastic chain conveyor belt, modular mesh conveyor belt, polypropylene conveyor belt, nylon conveyor belt, Teflon conveyor belt, stainless steel conveyor belt.

3. The conveyor belt is divided into:

, heat-resistant conveyor belt: TI type <100 degrees, T2 type <125 degrees, T3 type <150 degrees

, high temperature resistant conveyor belt: temperature resistance is not greater than 200 degrees

Burn-resistant conveyor belt (metal mesh core conveyor belt): temperature resistance 200-500 degrees

1. During transportation and storage, the conveyor belt should be kept clean, avoid direct sunlight, rain and snow, prevent contact with acids, alkalis, oils, organic solvents and other substances that affect rubber quality, and be 1 meter away from the heating device.

2. The temperature in the warehouse should be kept between -15 ° C and + 40 ° C, and the relative humidity should be kept between 50-80%.

3. During storage, the conveyor belt must be placed in rolls and must not be folded. It should be turned once a quarter during storage.

4. The running speed of the conveyor belt should not be greater than 5.0 m / s, the material with large block size and high abrasion and the use of fixed plow-type unloading device should be used as low as possible. Exceeding the specified speed will affect the service life of the tape.

5. The relationship between the diameter of the transmission roller of the conveyor and the layer of the conveyor belt, the matching of the transmission roller to the roller, and the requirements for the groove angle of the idler should be selected reasonably according to the design requirements of the conveyor.

6. In order to reduce the impact and abrasion of the material on the tape, the receiving section of the tape should shorten the gap between the idlers and take buffer measures. In order to prevent the tape from being scratched, the contact part between the scraper cleaning device and the unloading device of the blocking device and the tape should use a rubber plate with appropriate hardness, and do not use a tape head with a cloth layer.

7. During the use of the conveyor belt, please note the following:

A. Avoid the rollers being covered by the material, which will cause the rotation to be ineffective, and prevent the leaked material from being caught between the roller and the tape. Pay attention to the lubrication of the moving parts, but not oil the conveyor belt.

B. Strive to avoid starting with load.

C. Deviation of the tape should be corrected in time.

D. Local damage to the tape should be repaired in time to avoid expansion.

E. Prevent the tape from being blocked by racks, pillars or block materials, and prevent it from tearing.

Depending on the use environment, the thickness of the working surface of the heat-resistant, cold-resistant, oil-resistant, and acid-resistant alkali conveyor belt must not be less than 4.5mm, and the thickness of the upper and lower cover rubbers should be a multiple of 1.5. Order of conveyor belt indicates the width (mm), the number of cloth layers, the thickness of the upper cover rubber (mm) + the thickness of the lower cover rubber (mm), length, and the strong conveyor belt indicates the type of the canvas; heat, cold, oil, and acid and alkali resistant conveyor The band should be written. Endless belts and patterned belts shall be specified. Such as NN200 conveyor belt, bandwidth 800, 6 layers of canvas, glue thickness 4.5mm, glue thickness 1.5mm custom made 100 meters. Represents the following NN200-B800 × 6 4.5 + 1.5 100 meters

Conveyor belt deviation is the most common failure of belt conveyors. If the conveyor belt is not handled in time, it will cause severe friction between the conveyor belt and the frame, and the edges of the conveyor belt will be pulled or even torn, which will not only affect the life of the conveyor belt At the same time, it is also easy to spread materials outward, affecting civilized production. When the deviation is serious, the conveyor belt will fall off the idler and fall down, causing a major accident during the shutdown. Therefore, in the installation, commissioning, operation and maintenance of the belt conveyor, special attention should be paid to the running status of the conveyor belt to prevent the conveyor belt from running Cause accidents.

The deviation of the conveyor belt refers to the phenomenon that the centerline of the conveyor belt is inconsistent with the centerline of the conveyor during the operation of the conveyor, and is skewed to one side.

1 The cause of the deviation of the conveyor belt The fundamental cause of the deviation of the conveyor belt is the lateral force imbalance caused by the conveyor belt during operation. The main reasons are: 11 Installation quality reasons 1) The rack and roller are not adjusted straight.

2) The roller axis is not perpendicular to the centerline of the conveyor belt.

3) The strength of the connection between the rack and the ground is insufficient, and the rack is unstable.

4) The guide baffle of the material guide groove and the discharge groove are improperly installed and subjected to uneven force.

12 Conveyor belt quality reasons 1) Conveyor belt joints are not straight with the centerline.

2) The edge of the conveyor belt is S-shaped.

13 Loading mass The loading point is not in the center of the conveyor.

14Maintenance quality Drum cleaning is not clean, sticky coal, material, drum tilt, deformation, etc.

2 Handling of the deviation of the conveyor belt There are many factors affecting the deviation of the conveyor belt. At the same time, due to the different types of belt conveyors, the method of correcting the deviation is also different. Care should be taken to analyze the occurrence of deviations and take corresponding measures.

Fixed belt conveyors use fixed brackets. Usually, the outer ends of the rollers on both sides of the trough-shaped roller are installed at an angle to the running direction of the conveyor belt. In this way, due to the inclination of the idler, the idler on both sides generates a certain lateral thrust on the running conveyor belt. When the conveyor belt is in the normal position, the thrust on both sides is equal and the directions are opposite. Once deviation occurs, deviation

The lateral thrust on one side is greater than the other. The conveyor belt is restored to its normal position by this lateral thrust. It must be pointed out that the relative slippage between the conveyor belt and the deflection roller in this way will cause the belt to wear. Therefore, the inclination angle of the side rollers cannot be too large, generally 2 ° ~ 3 °. Therefore, this method is only effective in the case of a small deviation.

F is the resistance of the idler to the conveyor belt, which can be decomposed into two component forces. The component force Ft is perpendicular to the axis of the idler roller and forms a pair of acting force with the force that the conveyor belt acts on the idler to rotate the idler roller. Reaction force

1. Prevent the conveyor belt from starting.

2. Deviation of the conveyor belt should be corrected in time.

3. Different types and specifications of the number of layers of conveyor belts should not be used together, its joints are best to use vulcanization.

4. The type, structure, specifications, and number of layers of the conveyor belt should be reasonably selected according to the conditions of use.

5. Generally, the running speed of the conveyer belt should not be greater than 2.5m / s. Materials with large block size and high abrasion and the unloading device using fixed pear should use low speed as much as possible.

6. The relationship between the diameter of the driving roller of the roller conveyor and the layer of the conveyor belt, the matching of the driving roller, the redirecting roller, and the requirements of the groove angle of the supporting roller should be reasonably selected according to the design requirements of the conveyor.

7. The feeding direction should follow the running direction of the conveyor belt. In order to reduce the impact on the conveyor belt when the material falls, the chute should be adopted to reduce the material drop distance. The receiving section of the conveyor belt should shorten the distance between the idler rollers and use buffer idler rollers. For material leakage, the conveyor belt conforms to a soft and moderate blanking plate to prevent the blanking plate from being too hard and scratching the belt surface of the conveyor belt.

8. When the conveyor is in use, it should be added and repaired in time for the lack of supporting rollers. The supporting rollers are covered by the material, causing the rotation to be ineffective, preventing the leakage of materials between the roller and the tape. Pay attention to the lubrication of the moving part of the conveyor belt, but Do not oil the conveyor belt.

9. Prevent the conveyor belt from being blocked by racks, pillars, or block materials, and prevent it from being torn. If the conveyor belt is partially damaged, repair it with artificial cotton in time to avoid expansion.

The rubber materials used for various parts of ordinary conveyor belts include cover rubber, buffer rubber, cloth rubbing, and cloth sticking.

1. Cover rubber

In use, it is subject to the impact of materials, abrasion and microbial erosion, and various aging effects. Therefore, it is required that the covering rubber has good tensile strength (18Mpa) and abrasion resistance (abrasion amount0.8cm3 / 1.61Km), and is resistant to aging and biological erosion. In addition, it also requires good process properties such as viscosity. The main points of the formula design are as follows: Rubber technology. Net rubber is mainly composed of natural rubber or a suitable amount of styrene-butadiene rubber.

2.Buffer rubber

Buffer rubber between the cover rubber and the core layer can increase the adhesion between the two, and can absorb and disperse the impact force of the conveyed material, and play a buffering role. It is required that the rubber material has good adhesion (adhesion between rubber and cloth 3.15N / mm), large elasticity, small heat generation, good heat dissipation, and good process performance.

3.Erase the glue

The main function of the eraser is to bond the core canvas layer into a whole. Requires good adhesion to the core material (adhesion strength between cloth and cloth is not less than 4.5N / mm), fatigue resistance (number of cloth layer flexures 25,000 times / full peel), and sufficient Plasticity (plasticity 0.5 ~ 0.6) and anti-scorching process performance.

4. Raw rubber is mainly natural rubber, and 20-30 parts by mass of styrene-butadiene rubber is used, and the rubber content is about 50%. The vulcanization system is the same as the general sulfur and accelerator system. Accelerators are generally used in combination with M and DM, or a small amount of TMTD is added to accelerate the vulcanization speed, but care must be taken to prevent scorching of the rubber compound. The carbon black should be semi-reinforced carbon black or other soft carbon black, and the amount is about 10 parts by mass. Dope rubber mixed with styrene-butadiene rubber should appropriately increase the amount of coumarone resin and petroleum resin, otherwise the adhesion of the cloth layer will be reduced.

Selection and marking of common rubber conveyor belt materials

The rubber belt industry standard needs to adopt the following definitions, which can be used as a preliminary understanding by the user. The contents are summarized as follows: Compression strength: The maximum compressive stress that the sample can withstand in a compression test;

Melt flow rate: the amount of thermoplastic material extruded within a certain period of time under specified test conditions;

Elastic modulus: the ratio of stress to the corresponding strain of the material within the proportional limit;

Plastic: A material that uses polymers as its main component and can be flow-molded at a certain stage of processing into finished products;

Rubber: Elastomer that can be modified or has been modified to be insoluble but swellable in boiling solvents such as benzene, methyl ethyl ketone and ethanol toluene azeotrope. Modified rubber is not easy to heat and moderate pressure. Re-moulded, without diluent, stretch to twice the length at standard room temperature and then relax for 1 minute, and can be retracted to less than 1.5 times the original length in 1 minute;

Curing temperature: the temperature at which the adhesive or adhesive in the assembly is cured;

Curing time adhesive: the time required for the adhesive to cure in the assembly under the specified temperature or pressure or both;

Curing time plastic: the time for the plastic to fully harden;

Solid content: mass percentage of non-volatile substances determined under specified test conditions;

Tensile strength: The maximum stress experienced by a material before tensile fracture. When the maximum stress occurs at the yield point, it is called the yield tensile strength. When the maximum stress occurs at fracture, it is called the tensile strength at break.

Viscosity: The resistance to stable flow shown in the interior of a fluid. The test is the ratio of the shear stress to the shear rate of the liquid. Viscosity usually refers to "Newtonian viscosity." At this time, the ratio of shear stress to shear strain is constant. ;

After the above description of the term attributive, we can elaborate on the general rules of selection and labeling methods. Among them, the name, brand abbreviation code, relevant description or performance index code, standard number should be indicated in the plastic labeling; if there is no brand or Code, only its name and standard number. When there is no relevant standard, only the material name or commercial grade can be marked. At this time, the performance indicators of the material should be clearly specified in the product drawings or technical documents. In the plastic marking, if there is a grade The name is unified with plastic. If there is no brand name, the detailed name of the material should be clearly stated. Except for the name and the abbreviation code, the other components are connected by a half-width connector. The standard number is valid as of now. For standard references, only the standard code and standard sequence number are noted. The year of publication of the standard does not need to be noted. The standard code and standard sequence number are usually separated by a space of half a character, such as polyethylene PE. Please indicate the name, abbreviation code, recommended use and processing method code, and important properties Additive code, density, melt mass flow rate, standard number, and polypropylene, PP, should also be marked with the type code of the polymer, the main use code, the melt flow rate code, the standard number, the type code of the polymer Written after the abbreviation code, with a connector in the middle as a connection;

In addition, in terms of synthetic rubber, its brand name is composed of a rubber variety code and four Arabic numerals. The first two digits of the four digits represent the main characteristics of the rubber variety, and the last two digits are based on the filling situation, Mooney viscosity or molecular weight, etc. The serial numbers are arranged according to different properties. The rubber materials are marked by name, type, grade, basic physical properties, grade number, standard number, and the name is uniformly written as rubber. The label of the rubber plate should indicate the product name, rubber plate, nominal thickness, Technical characteristics code oil resistance, tensile strength, elongation at break, nominal hardness, heat resistance, low temperature resistance and other indicators, standard numbers and other content, if there is no relevant standard, it should be clearly specified in the product drawings or technical documents Just specify the performance indicators of the rubber sheet.

1. During transportation and storage, the conveyor belt should be kept clean to avoid direct sunlight or rain or snow, and prevent contact with acids, alkali oils, organic solvents and other substances, and be one meter away from the heating device.

2. The temperature in the warehouse should be kept between -18 -40 during storage, and the relative temperature should be kept between 50-80% RH.

3. During storage, the product must be placed in rolls, not folded, and it should be turned once a quarter during storage.

4. Conveyor belts of different types and specifications should not be connected together, and the joints should preferably be glued together.

5. The type, structure, specifications, and number of layers of the conveyor belt should be reasonably selected according to the conditions of use.

6. Generally, the running speed of the conveyor belt should not be larger than 2.5 meters per second, and the materials with large block size and high abrasion and the use of fixed plow-type unloading devices should use low speed as much as possible.

7. The diameter of the transmission drum of the conveyor and the relationship between the cloth layer of the conveyor belt, the rumbling drum, the redirecting drum, and the requirements for the groove angle of the supporting roller should be reasonably selected according to the design rules of the conveyor.

8. The feeding direction should follow the running direction of the tape. In order to reduce the impact of the material on the tape, a chute should be used to reduce the distance of the material. The receiving section of the tape should shorten the gap between the rollers and use a buffer roller. In order to prevent material leakage, The side of the belt should be soft and moderate to prevent the material from being too hard and scratching the belt surface of the conveyor belt.

9. The following matters should be noticed in the use of the conveyor belt:

(1) Prevent the rollers from being covered by the material, causing the rotation to be ineffective, and prevent the leaked material from being caught between the drum and the tape. Pay attention to the lubrication of the moving parts, but not oil the conveyor belt;

(2) Avoid starting with load;

(3) Deviation of the tape should be corrected in time;

(4) It is found that the local operation of the tape should be repaired in time to avoid expansion;

(5) Prevent the tape from being blocked by the frame, pillars or block materials, and prevent it from being torn and torn.

Features: Cotton canvas, nylon canvas or polyester canvas is used as the belt core, the belt body has good elasticity, good groove forming performance and low elongation. Covering rubber is made of acid and alkali resistant materials, which has good chemical resistance and good physical properties.

Uses: Suitable for conveying corrosive materials such as acid or alkali with chemical factories, fertilizer plants, paper mills and other factories and mines.

Acid and alkali resistant conveyor belt performance:

project		unit	index
Overlay performance	Tensile Strength	MPa	10
	Elongation at break	%	300
	Amount of wear	cm3 / 1.61km	1.0
	Acid resistance coefficient 30% H2SO4 normal temperature 24h		0.7
Adhesive strength	Between cover and cloth	N / mm	2.7
	Between layers	N / mm	2.7

Whole core flame retardant conveyor belt The whole core flame retardant conveyor belt is mainly used in coal mines: Features: belt body does not delaminate, small elongation, impact resistance, tear resistance. According to the different structure, it can be divided into PVC type, (plastic surface), PVG type (with rubber surface added on the basis of PVC), and the whole core flame retardant tape, which implements the MT / 914-2002 standard. The PVC type is suitable for conveying materials in dry conditions with an inclination angle below 16 degrees. PVG type is suitable for the transportation of wet watery materials with an inclination below 20 degrees. Model N / mm tensile strength:

level	level 4	Level 5	Level 6	Level 7	Level 8	Level 9	10 levels
model	680S	800S	1000S	1250S	1400S	1600S	1800S

Safety performance: The conveyor belt has passed tests such as flame retardant test and static test, and has obtained the certificate of coal safety certification and customer approval. Mechanical properties: Excellent mechanical properties, can provide users with the longest service life and economical installation and use. Longest service life: The service life of the belt body is determined by the following factors: a dense belt core woven from warp and weft filaments and covered cotton; dipped in a specially formulated PVC material to make the belt core and cover rubber It achieves extremely high bonding strength between the two; specially formulated cover rubber; thus making the belt body impact resistant, tear resistant and abrasion resistant. This product has the whole core flame retardant belt abrasion resistance, antistatic, waterproof, flame retardant, high strength, excellent safety performance, and lower cost and lower price compared with other flame retardant conveyor belts. One of the varieties of flame-retardant conveyor belts, especially suitable for coal mines and other wells with low slopes. Product features: Product structure: This product uses the overall core as the skeleton material, and is made by dipping, coating and hanging PVC materials with excellent antistatic and flame retardant properties. Joint performance: According to the strength of the belt body and the core structure, the mechanical buckle connection is used, and its strength can reach 50% -90% of the belt body strength; using vulcanized joints, its strength can reach 60% -90% of the belt strength. Various forms of joints can meet the different needs of customers and ensure the safe and efficient operation of the system.

Rubber conveyor belt enterprises belong to the process industry and have the characteristics of discrete "multi-variety, small-batch" production. The production of semi-finished products needs to be produced according to the formula process, and the production of finished products needs to be produced according to the order and according to the single-piece process. The products include conveyor belts, conveyors, rollers, rollers, and conveyors. There are more than forty varieties, and each variety involves multiple specifications. This results in large changes in the specifications of ordered products and complex production processes. Difficulties in production planning and production process management.

1. The structure, specifications, and number of layers of the conveyor belt required by the user should be reasonably applied according to the use conditions (materials of conveying materials and conveying environment, etc.).

Layers of conveyor frame 3-4 5-8 9-12

Safety factor 10 11 12

The strength of the conveyor belt should meet the following requirements with a safety factor:

2. Different types, specifications, and layers of conveyor belts cannot be connected together. It is best to use glue joints for conveyor belt joints.

3. The running speed of the conveyor belt should generally not be greater than 2.5m / s. Materials with large block size and high abrasion and those using fixed plow-type unloading devices should use low speed.

4. The diameter of the conveyor belt of the conveyor, the relationship between the layers of the conveyor belt, the matching of the drive roller, the redirecting roller, and the requirements for the idler should meet the design requirements of the TD62 conveyor.

5. The feeding direction should be consistent with the running direction of the conveyor belt. In order to reduce the impact of the material falling on the conveyor belt, a chute is used to reduce the material falling distance. The receiving section of the conveyor belt should be shortened. Material, the side of the belt should be soft and moderate, to prevent the material from being too hard and scratching the belt surface

Calculation of the length of the conveyor belt joint:
L = L + L (n-1) S + 1 / 2B (single)
L = M [L + (n-1) S] + 1 / 2B (multiple)
Wherein L

Introduction of PU conveyor belt: PU environmentally-friendly materials: Polyurethane (PU) is used as the raw material for the production of conveyor belts. The product formula is scientific and reasonable. It can meet the food hygiene standards and can be in direct contact with food. And has: oil resistance, corrosion resistance, cold resistance, cutting resistance and other characteristics. Polyurethane (PU) conveyor belts use specially treated high-strength synthetic polyurethane fabrics as the supporting frame, and the coating layer is made of polyurethane (PU) resin. It not only has the characteristics of high tensile strength, good flexibility, lightness, thinness, and toughness of ordinary conveyor belts, but also is oil-resistant, non-toxic and hygienic, and easy to clean. This type of conveyor belt fully meets the US FDA sanitary standards, is abrasion-resistant, and resistant to physical aging. It is a durable conveyor product.

This conveyor belt uses fiber fabric as the core and general rubber as the covering material, and the surface is smooth and flat (Figure 1. The belt core is a layered or integrated fabric woven from fibers such as cotton, nylon, polyester, or vinylon. Cotton Fiber is the earliest core material used. It is easy to adhere to rubber. The strength is slightly increased in the wet state, but the breaking strength is low (mostly around 56 N / mm). The corrosion resistance and mold resistance are poor, and the use is gradually decreasing. In the late 1950s, nylon fiber fabrics were used as core materials, and it has become the largest amount. The strength of nylon fibers is as high as 700 N / mm, and it is resistant to water, corrosion, and bending fatigue; but it has elastic elongation. Larger. The performance of polyester fiber is similar to that of nylon fiber, and its elastic elongation is only half that of nylon fiber when used. It is a promising material. Vinylon fiber has a strength of 200 N / mm. It is smaller than nylon fiber, easy to be bonded to rubber, and has good heat resistance, but the strength should be reduced by 10-25% in wet state. It is only used in a few countries such as China and Japan. Only one fiber can be used when weaving the core. , Also available in two fibers Spinning or intertwined.

The endless conveyor belt is a jointless endless conveyor belt that has been made in the production process. The strength of the core joint can reach 90% of the strength of the tape body. The tape is transported in a balanced manner and uses a small amount of elongation. The endless conveyor belt core is made of high-quality cotton or cotton interwoven canvas. The endless conveyor belt produces ordinary endless conveyor belts of suitable length, width and thickness, heat-resistant endless conveyor belts, cold-resistant endless conveyor belts, and acid resistance. Alkali, high temperature resistant and sanitary endless conveyor belt .

NBR has good mechanical properties and is resistant to mineral oil, hot water, ozone, A, B, C, butane, etc. -40 ~ 120. Manufacture of O-rings, oil seals, etc. are commonly used in general hydraulic starting systems. For static or dynamic sealing.

EPDM EPDM is used at high temperature, is resistant to steam, weak acid, and does not contain mineral oil. -40 ~ 160 For high temperature gas seal up to (200 degrees)

Fluorine rubber FKM heat resistance, acid and alkali resistance, chemical resistance, resistance to various

Aramid conveyor belt combines high strength, low elongation, resistance to flexion, impact resistance, puncture and tear resistance, high temperature resistance, fire resistance, and corrosion resistance. It is suitable for long-distance, large-volume, high-speed conveying materials. More prominently, the aramid conveyor belt has a smaller mass and thickness than steel wire core conveyor belts and polyester conveyor belts, which can reduce conveyor manufacturing costs and work energy consumption, save energy, and better reflect and highlight the lightweight Features.

In developed regions and countries such as Europe and the United States, the application of aramid conveyor belts has become widespread and has achieved significant results. At present, China's aramid conveyor belts are in their infancy. With the continuous progress of domestic aramid production technology and the expansion of the production capacity of major foreign manufacturers, the price of aramid materials will be greatly reduced; the country's advocacy of energy saving and environmental protection concepts and the use of manufacturers' long-distance, high-strength, long-life pursuit , Will inevitably promote the development and application of aramid high-performance conveyor belts. The development direction of future conveyor belts is functionalization, low energy consumption, long distance, high strength and high load, all of which indicate that aramid high-performance conveyor belts have broad development prospects. In the near future, aramid conveyor belts will be very It is possible to replace steel wire conveyor belts to undertake long-distance, high-load material transportation tasks ^[1] .