What Is a Syringe Plunger?

The beer (pí) machine is an injection molding machine (referred to as an injection machine or an injection molding machine), which is a main molding equipment that uses thermoplastic or thermosetting materials to make plastic products of various shapes using plastic molding molds. The beer word has only one pronunciation (pí), but in the field of printing. The word "beer" is often misinterpreted as bi, which is influenced by Cantonese, because injection molding developed earlier in Guangdong and Hong Kong.

Beer machine

Injection molding is achieved through injection molding machines and molds.
Automatic beer machine
The types of injection molding machines are: vertical, horizontal, and all-electric, but no matter what kind of injection molding machine, there are two basic functions:
(1) Heat the plastic to make it melt;
(2) Apply high pressure to the molten plastic to make it eject and fill the mold cavity.
Injection molding machine usually consists of injection system, mold clamping system, hydraulic transmission system, electrical control system, lubrication system, heating and cooling system, safety monitoring system and so on.
(3) Injection system
The role of the injection system: The injection system is one of the most important components of the injection molding machine. Generally, there are three main forms of plunger, screw, and screw pre-plastic plunger injection. Currently the most widely used is the screw type. Its function is that in a cycle of the injection molding machine, a certain amount of plastic can be heated and plasticized within a specified time, and the molten plastic is injected into the mold cavity through a screw under a certain pressure and speed. After the injection is completed, the molten material injected into the mold cavity is maintained in shape.
Composition of the injection system: The injection system consists of a plasticizing device and a power transmission device.
The plasticizing device of the screw type injection molding machine is mainly composed of a feeding device, a barrel, a screw and a nozzle. The power transmission device includes an injection oil cylinder, an injection seat moving oil cylinder, and a screw drive device (melt motor).
(4) clamping system
The role of the clamping system: the function of the clamping system is to ensure that the mold is closed, opened and ejected. At the same time, after the mold is closed, it is provided to give the mold sufficient clamping force to resist the cavity pressure caused by the molten plastic entering the mold cavity, to prevent the mold from opening and causing the undesirable status of the product.
The composition of the mold clamping system: The mold clamping system is mainly composed of a mold clamping device, a mold adjustment mechanism, an ejection mechanism, a front and rear fixed template, a moving template, a mold clamping cylinder and a safety protection mechanism.
(5) Hydraulic system
The function of the hydraulic transmission system is to realize that the injection molding machine provides power according to the various actions required by the process, and meets the requirements of the pressure, speed, temperature and other parts of the injection molding machine. It is mainly composed of various kinds of hydraulic components and hydraulic auxiliary components, of which the oil pump and motor are the power source of the injection molding machine. Various valves control oil pressure and flow to meet the requirements of the injection molding process.
(6) Electrical control system
The electric control system and the hydraulic system can cooperate reasonably to achieve the process requirements of the injection machine (
The working principle of the injection molding machine is similar to the injection syringe. It uses the thrust of the screw (or plunger) to inject the plasticized molten state (that is, viscous flow state) into the closed mold cavity. The process of obtaining products after curing and setting.
Injection molding is a cyclic process, and each cycle mainly includes: quantitative feeding-melt plasticization-pressure injection-filling cooling-opening and taking parts. After removing the plastic part, the mold is closed and the next cycle is performed. Injection molding is a cyclic process, and each cycle mainly includes: quantitative feeding-melt plasticizing-pressure injection-filling cooling-opening the mold to take the part, take out the plastic part and then close the mold, and proceed to the next cycle.
Injection molding machine operation items: Injection molding machine operation items include control keyboard operation, electrical control system operation, and hydraulic system operation. The injection process action, feeding action, injection pressure, injection speed, ejection type selection, temperature monitoring of each section of the barrel, and adjustment of injection pressure and back pressure are performed separately.
The molding process of a general screw injection molding machine is: firstly add granular or powdered plastic into the barrel, and then turn the screw and the outer wall of the barrel to make the plastic into a molten state, and then the machine performs the mold clamping and injection seat forward, Keep the nozzle close to the gate of the mold, and then pass pressure oil into the injection cylinder to advance the screw, so that the melt is injected into the closed mold with a lower temperature at a higher pressure and faster speed. Time and pressure are maintained (also known as holding pressure), cooling, solidifying and forming, and the product can be opened to remove the mold (the purpose of holding pressure is to prevent the backflow of the melt in the cavity, replenish the material into the cavity, and ensure the product With certain density and dimensional tolerances). The basic requirements of injection molding are plasticization, injection and molding. Plasticization is a prerequisite for achieving and guaranteeing the quality of molded products. To meet the requirements of molding, injection must ensure sufficient pressure and speed. At the same time, due to the high injection pressure, a correspondingly high pressure is generated in the mold cavity (the average pressure in the mold cavity is generally between 20 and 45 MPa), so it must have a sufficient clamping force. It can be seen that the injection device and the mold clamping device are the key components of the injection molding machine.
There are mainly three aspects to the evaluation of plastic products. The first is the appearance quality, including integrity, color, gloss, etc .; the second is the accuracy between size and relative position; the third is the physical properties, chemical properties, Electrical properties, etc. These quality requirements are also different according to the product's use occasions. The defects of products are mainly in the aspects of mold design, manufacturing accuracy and wear degree. But in fact, the technicians of the plastic processing plant are often struggling to face the difficult situation of not much effect by using process means to make up for the problems caused by the defects of the mold.
The adjustment of the process in the production process is a necessary way to improve product quality and yield. Because the injection cycle itself is very short, if the process conditions are not well grasped, there will be endless waste products. When adjusting the process, it is best to change only one condition at a time and observe a few more times. If the pressure, temperature, and time are adjusted uniformly, it is easy to cause confusion and misunderstanding. If there is a problem, I do nt know why. The measures and means for adjusting the process are various. For example, there are more than a dozen possible solutions to the problem of product dissatisfaction. You must choose one or two major solutions to solve the crux of the problem to truly solve the problem. Also, pay attention to the dialectical relationships in the solution. For example: if the product has a depression, sometimes the material temperature should be increased, sometimes the material temperature should be lowered; sometimes the material amount should be increased, and sometimes the material amount should be reduced. The feasibility of reversing the problem should be acknowledged.
The injection molding machine has the ability to form complex, precise dimensions or densely textured plastic products with metal inserts at one time. It is widely used in national defense, machinery and electronics, automobiles, transportation, building materials, packaging, agriculture, culture, education, health and people's daily life. All areas of life. With the rapid development of the plastics industry today, injection molding machines occupy an important position in terms of both quantity and variety. The total production of plastic injection machines accounts for 20% -30% of the entire plastic molding equipment, thus becoming the fastest growing plastic production machine in the world today. One of the most models. According to relevant statistics, from 1996 to 1998, China exported 8,383 (sets) of injection molding machines and imported 42,959 (sets) of injection molding machines. Among them, China's output of injection molding machines reached 20,000 in 1998, and its sales accounted for the total sales of plastic machines. 42.9%.
China's plastics processing enterprises are scattered all over the country, and the technical level of the equipment is uneven. Most of the processing enterprises' equipment needs technical transformation. In the past few years, the technical progress of China's plastics machine industry has been very significant, especially the gap between the technical level of injection molding machines and famous foreign brands has been greatly reduced, and significant improvements have been made in terms of control level, product internal quality and appearance. Selecting domestic equipment, with a small investment, can also produce products of equivalent quality to imported equipment. These have created conditions for technological transformation of enterprises.
Generally speaking, most customers who have been engaged in the injection molding industry for many years have the ability to judge and choose the appropriate injection molding machine for production. However, in some cases, the customer may need the assistance of the manufacturer to decide which type of injection molding machine to use, or the customer may only have a sample or idea of the product, and then ask whether the manufacturer's machine can be produced or which model is compared Suitable for.
In addition, some special products may need to be equipped with special devices such as pressure accumulators, closed circuits, injection compression, etc. in order to produce more efficiently. It can be seen that how to determine the appropriate injection molding machine for production is an extremely important issue. The following information is provided for your reference.
The important factors that usually affect the choice of injection molding machine include molds, products, plastics, molding requirements, etc. Therefore, the following information must be collected or available before selection:
mold size (width, height, thickness), weight, special design, etc .;
Type and quantity of plastic used (single raw material or multiple plastics);
Appearance dimensions (length, width, height, thickness), weight, etc. of the injection molded product;
Forming requirements, such as quality conditions and production speed.
After obtaining the above information, you can follow the steps below to select the appropriate injection machine:
1. Selecting the right type: The model and series are determined by the product and plastic.
Because there are many types of injection machines, it is necessary to correctly determine which injection molding machine or series of products to produce this product at the beginning. For example, it is a general thermoplastic plastic or bakelite raw material or PET raw material. Color, two-color, multi-color, sandwich or mixed color, etc. In addition, certain products require conditions such as high stability (closed loop), high precision, super high rate of fire, high injection pressure, or rapid production (multi-loop), and must also choose the appropriate series to produce.
2. Lowering: Determine whether the large column distance, mold thickness, minimum mold size and mold plate size of the machine are appropriate according to the mold size to confirm whether the mold can be placed.
The width and height of the mold must be less than or at least one side is smaller than the inner distance of the large column;
The width and height of the mold should be within the size of the mold plate;
The thickness of the mold must be between the thickness of the injection molding machine;
The width and height of the mold must conform to the minimum mold size recommended by the injection molding machine.
3. It can be obtained that the mold and finished product are used to determine whether the mold opening stroke and the supporting die stroke are sufficient for the finished product to be taken out.
The mold opening stroke must be at least more than twice the height of the finished product in the direction of the switching mold, and the length of the sprue must be included;
The support stroke should be enough to eject the finished product;
4. Locking: The "clamping force" tonnage is determined by the product and plastic.
When the raw material is injected into the cavity under high pressure, a mold supporting force is generated, so the clamping unit of the injection molding machine must provide sufficient "clamping force" so that the mold will not be opened. The calculation of clamping force requirements is as follows:
Calculate the projected area of the finished product in the direction of the switch mold from the appearance of the finished product;
Supporting mold force = projected area of the finished product in the direction of the switching mold (cm2) × number of mold cavities × pressure in the mold (kg / cm2);
The pressure in the mold varies with the raw materials, and the general raw materials take 350 400kg / cm2;
The clamping force of the machine must be greater than the supporting die force, and for the sake of insurance, the clamping force of the machine must generally be greater than 1.17 times the supporting die force;
So far, the specifications of the clamping unit have been initially determined, and the tonnage of the model has been roughly determined, and then the following steps must be performed to confirm which screw diameter of the injection unit is more suitable.
5. Full injection: Determine the required "injection amount" from the weight of the finished product and the number of mold cavities and select the appropriate "screw diameter".
The number of mold cavities (one mold and several cavities) should be considered in calculating the weight of the finished product;
For the sake of stability, the injection amount must be more than 1.35 times the weight of the finished product, that is, the weight of the finished product must be within 75% of the injection amount;
6, shot well: determine the "screw compression ratio" and "injection pressure" and other conditions from plastic.
Some engineering plastics require a higher injection pressure and a suitable screw compression ratio design in order to have a better molding effect. Therefore, in order to make the finished product better injection, the need for injection pressure and compression ratio issues must be considered when selecting the screw. .
Generally speaking, smaller diameter screws provide higher injection pressure.
7, shot fast: and "shot speed" confirmation.
Some finished products require high injection rate and rapid injection to stabilize the molding, such as ultra-thin finished products. In this case, it may be necessary to confirm whether the injection rate and injection speed of the machine are sufficient, and whether it needs to be equipped with pressure accumulators and closed-loop control devices. In general, under the same conditions, a screw that can provide a higher injection pressure usually has a lower rate of fire, and a screw that can provide a lower injection pressure usually has a higher rate of fire. Therefore, when selecting the diameter of the screw, the injection amount, injection pressure, and injection rate (injection speed) need to be cross-considered and selected.
In addition, a multi-loop design can also be used to reduce the molding time by synchronizing the compound action.
After the above steps, the injection molding machine that meets the requirements can be determined in principle, but some special issues may also need to be considered, including:
The size problem:
Under certain special conditions, the customer's mold or product may have a small mold volume but a large shot volume, or a large mold volume but a small shot volume. In this case, the standard specifications set by the manufacturer may not be available. In line with customer needs, the so-called "big and small match", that is, "big wall small shot" or "small wall large shot". The so-called "big wall and small shot" refers to the original standard clamping unit with a small injection screw. On the other hand, "small wall and big shot" refers to the original standard clamping unit with a large injection screw. Of course, there may be several stages in clamping and injection.
Concept of fast machine or high speed machine:
In practical applications, more and more customers will require the purchase of so-called "high-speed machines" or "fast machines". In general, in addition to the needs of the product itself, most of the purpose is to shorten the molding cycle, increase the output per unit time, and then reduce production costs and improve competitiveness. Generally, there are several ways to achieve the above purpose:
Faster injection speed: increase the motor and pump, or increase the accumulator (preferably closed circuit control);
Faster feeding speed: increase the motor and pump, or reduce the feeding hydraulic motor to increase the screw speed;
Multi-loop system: adopts double-loop or triple-loop design to synchronize compound actions to reduce molding time;
Increase the mold waterway to improve the cooling efficiency of the mold;
However, "there is no such thing as a free lunch". Although the improvement and improvement of machine performance can increase production efficiency, it often increases.
The directional movement of current charge is called current, and current is usually expressed by I. There are two types of current: DC and AC. The magnitude and direction of the current that does not change with time is called direct current. The magnitude and direction of the current that changes with time is called alternating current. The unit of current is ampere (A). Milliampere (mA) or microampere (uA) is also commonly used as the unit. 1A = 1000mA, 1mA = 1000uA.
The current can be measured with an ammeter. When measuring, connect the ammeter in series in the circuit, and select the range of the ammeter pointer close to full deflection. This can prevent the ammeter from being damaged by excessive current.
Voltage
The reason why river water can flow is because of the difference in water level; the reason why electric charge can flow is because of the potential difference. The potential difference is also the voltage. Voltage is the cause of the current. In the circuit, the voltage is usually expressed by U. The unit of voltage is volt (V). Millivolt (mV) or microvolt (uV) is also commonly used as the unit. 1V = 1000mV, 1mV = 1000uV.
The voltage can be measured with a voltmeter. When measuring, connect the voltmeter in parallel to the circuit, and select the range of the voltmeter pointer close to full deflection. If the voltage on the circuit cannot be estimated, use a large range first, and then use a suitable range after a rough measurement. This will prevent damage to the voltmeter due to excessive voltage.
resistance
The part of the circuit that hinders the passage of current and causes energy consumption is called resistance. The resistance is usually expressed by R. The unit of resistance is Europe (), and it is usually used in kiloohms (k) or megohms (M). 1k = 1000, 1M = 1000000. The resistance of a conductor is determined by the material, cross-sectional area, and length of the conductor.
Resistance can be measured with multimeter ohms. When measuring, select the ohm range of the meter pointer close to half deflection. If the resistance is in the circuit, measure the resistance after heating one end.
N1600XR Fully Automatic Flat Die Cutting Machine
Automatic beer machine
Top-suction paper feeding section, die cutting section, waste cleaning section, high stack paper receiving section
Maximum paper size: 1600x1100mm
Applicable paper range: cardboard thickness = 0.1 ~ 2mm corrugated box and color-mounted corrugated board (F, E, B) thickness = 0.7 ~ 4mm
Maximum mechanical speed: 5000 times / hour
This model is mainly equipped with the following:
Feida / Feeding Department
* The up-suction feeder with eight vacuum nozzles can adapt to paper and corrugated cardboard of various thicknesses; (especially suitable for color-mounted corrugated cardboard)
* Gantry frame pre-stacking device;
* Non-stop Feida lifting platform device;
* Double sheet control device;
* Pull and push side gauge device, easy to switch;
* One original imported vacuum pump for blowing and suction;
* Unique phase adjustment device can fine-tune the cardboard of different widths without stopping;
Die-cutting department
* The worm gear crank drives the elbow-type high-precision plane die-cutting table;
* Fixed high-precision plane die-cutting table;
* The die-cutting section operates the safety door and plate frame safety locking system;
* Imported high torque pneumatic clutch / brake;
* Pitch-type pressure fine adjustment device <reading table with display>;
* The latest technology of multi-disc parallel cam intermittent mechanism and overload protection imported torque clutch;
* High-precision imported guillotine transmission chain;
* The connection between the die-cutting knife plate and the die-cutting plate frame adopts the form of grasping nails and screws, and the central positioning system is used when loading, which is fast and accurate.
* 8 strips of paper teeth, each of 12 imported stainless steel teeth and supporting pillows;
* Detect the electric eye of the paper in place at the paper inlet of the die-cutting part, and monitor and monitor the whole process of the whole paper delivery route;
* Two sets of pre-determined bit blocks can be adjusted on one or both sides at the same time;
* The fault display and speed display adopt computer-controlled human-machine interface (LCD). The display data, operation instructions and fault analysis of the entire machine can be quickly and intuitively reflected and processed;
* Each component is forced circulation lubrication system and equipped with oil pressure display and oil cut off alarm device;
* Tooth row drive chain is equipped with independent automatic lubricating oil device;
Waste removal department
* Three-frame coordinated waste cleaning device, harmonious action, accurate and powerful, can effectively remove all kinds of special-shaped waste;
* Double-layer drawer-type upper and lower cleaning mold clamping frame, which can quickly load and unload and adjust the cleaning tool;
* The middle frame adopts a central positioning system, which is fast to adjust and easy to adjust;
* Electric upper waste frame lifting device;
* The cleaning frame adopts a central positioning system, which can make the size of the cleaning mold consistent with that of the die cutter blade;
* The front waste cleaning device can completely remove the waste material at the paper edge, and the waste material at the paper edge is sent out of the machine by the conveyor belt (the process can be interchanged without accessories)
High stack delivery department
* Automatic high stack paper receiving lifting platform;
* Non-stop cloth curtain type fast secondary paper receiving table;
* Electronic counter and counting insert device;
* Spring-type chain tension buffer device and main chain safety device;
Electrical part
* Original imported programmable controller PLC controls the operation of the whole machine and performs fault monitoring;
* The electrical components and electrical circuits adopt European and American advanced national safety standards (CE standards);
Standard accessories
* One large operating platform
* One piece of 7mm thick die-cut steel plate (HRC45 °)
* One die-cut plate frame (with one 5mm thick polished hard pad, HRC45 °)
* One stick of backing paper teeth
* One set of tools (including one portable toolbox)
* One box of waste removal accessories
Performance specifications
Paper size
: 1600x1100mm
Minimum paper size
: 800x500mm
Maximum die cutting range
: 1570x1080mm
Applicable paper range
: Thickness of cardboard = 0.1 ~ 2mm, thickness of corrugated box and colored corrugated board (F, E, B) = 0.7 ~ 4mm
Minimum scrap width
: 10mm (depending on the arrangement of die-cut products, paper factors and operating factors)
Minimum bite width
: 6 ~ 12mm
Knife wire high
: 23.8mm
Mechanical speed
: 5000 times / hour
Common working speed
: 2000 ~ 4500 times / hour (depending on the arrangement of die-cut products, paper factors and operating factors)
Die cutting pressure
: 400 tons
Total electrical power
: 36KW (main motor power: 22KW, variable frequency speed regulation)
Power requirements
: 380V, three-phase, 50HZ
Compressed air pump
Air compressor displacement 0.35m3 / min - user-supplied
Pressure adjustment range
: ± 1.5mm
Overall dimensions
: 8570x5155x2500mm (length x width x height) stepping platform)
Machine net weight
: 30 tons
Gross machine weight
: 38 tons

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