What Is a Plastic Granulator?
The extruder divides the machine head into a beveled machine head (120o included angle) and a right-angle machine head according to the angle between the head material flow direction and the screw centerline. The shell of the machine head is fixed to the fuselage with bolts. The die in the machine head has a core seat and is fixed to the wire inlet port of the head with a nut. There is a hole in the center for passing the core wire. There is a pressure equalizing ring on the front of the machine head for equalizing the pressure. The extrusion molding part is composed of a die sleeve and a die sleeve. The position of the die sleeve can be adjusted by the bolt through the support In order to adjust the relative position of the mold sleeve to the mold core, it is easy to adjust the uniformity of the thickness of the extrusion cladding. The head is equipped with a heating device and a temperature measuring device.
Plastic granulator
- The extruder divides the machine head into a beveled machine head (120o included angle) and a right-angle machine head according to the angle between the head material flow direction and the screw centerline. The shell of the head is used
- The main machine of the plastic granulator is an extruder, which is composed of an extrusion system, a transmission system and a heating and cooling system. Vigorously develop renewable resources and turn waste into treasure.
- Extrusion system The extrusion system includes a hopper and a head. Plastic is plasticized into a uniform melt through the extrusion system, and is continuously extruded by the screw under the pressure established in the process.
- Screw: It is the most important part of the extruder. It is directly related to the application range and productivity of the extruder. It is made of high-strength and corrosion-resistant alloy steel.
- Machine barrel: It is a metal cylinder. It is generally made of alloy steel or composite steel pipe lined with alloy steel that is heat-resistant, high compressive strength, strong, wear-resistant and corrosion-resistant. The barrel cooperates with the screw to realize the crushing, softening, melting, plasticizing, venting and compacting of the plastic, and continuously and uniformly convey the rubber to the molding system. Generally, the length of the barrel is 15 to 30 times its diameter. The principle is to fully heat and plasticize the plastic.
- (3) Hopper: The bottom of the hopper is equipped with a cutting device to adjust and cut off the material flow. The side of the hopper is equipped with a sight hole and a calibration measuring device.
- Machine head and mold: The head is composed of alloy steel inner sleeve and carbon steel outer sleeve, and the head is equipped with a forming mold. The function of the machine head is to transform the plastic melt that rotates into parallel and linear motion, and evenly and smoothly introduce it into the mold sleeve, and give the plastic the necessary forming pressure. The plastic is plasticized and compacted in the barrel. It passes through the porous filter plate through a certain flow channel through the neck of the head and flows into the head forming mold. The core mold sleeve is properly matched to form a ring-shaped gap with a decreasing cross-section. A continuous and dense tubular coating is formed around the core wire. In order to ensure that the plastic flow path in the machine head is reasonable and to eliminate the dead angle of the accumulated plastic, a shunt sleeve is often installed. In order to eliminate the pressure fluctuation during the extrusion of the plastic, there is also a pressure equalizing ring. The head is also equipped with a mold correction and adjustment device, which is convenient for adjusting and correcting the concentricity of the mold core and the mold sleeve. 2. Transmission system The function of the transmission system is to drive the screw and supply the torque and speed required by the screw in the extrusion process. It usually consists of a motor, a reducer and a bearing.
- Heating and cooling device Heating and cooling are necessary conditions for the plastic extrusion process.
- In 2013, the extruder usually uses electric heating, which is divided into resistance heating and induction heating. The heating sheet is installed in the body, neck and head. The heating device heats the plastic in the cylinder externally to increase the temperature to reach the temperature required for the process operation.
- The cooling device is set to ensure that the plastic is in the temperature range required by the process. Specifically, it is to eliminate the excess heat generated by the shear friction caused by screw rotation, so as to avoid plastic decomposition, scorching, or setting difficulties due to excessive temperature. The barrel cooling is divided into two types: water cooling and air cooling. Generally, small and medium-sized extruders are more suitable for air cooling, and large-sized ones are mostly water-cooled or combined with two forms of cooling. Screw cooling is mainly used for central water cooling. To stabilize the amount of glue and improve the quality of the product; but the cooling at the hopper is to strengthen the transport of solid materials to prevent the plastic particles from sticking due to temperature rise and blocking the material mouth, and the second is to ensure the normal operation of the transmission part.
- The energy saving of plastic granulator can be divided into two parts: one is the power part and the other is the heating part.
- Power saving : Most use
- The plastic granulator mold is divided into manual and electric. The granulator needs to change the screen frequently to remove impurities. The extrusion die is usually 18 holes. The filter is blocked after the filter is blocked. The original manual screen change will be tiring. Electric molds can be used instead of labor with electric motors, saving time and effort.
- Automatic granulating plastic granulator is a kind of plastic granulating machinery and equipment suitable for waste film, waste silk, waste woven bags, waste plastic bottles, waste plastic barrels, boards, and crushed materials.
- Technical parameters of automatic mixing plastic granulator:
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- Note: Dimensions (mm):
- Host: 2100 × 850 × 1050
- Deputy machine: 1500 × 650 × 750
- Screw is operating normally, but does not discharge
- Reasons: the hopper feed is discontinuous; foreign matter is blocked at the feed port or a "bridge" is formed; metal hard objects fall into the screw groove to block the screw groove, and the material cannot be fed normally;
- Treatment method: increase the feeding amount to make the screw feeding continuously stable; stop the foreign matter in the feed port to eliminate the "bridge" phenomenon; if it is confirmed that metal foreign matter has fallen into the screw groove, stop the screw immediately to remove the metal foreign matter.
- The main unit does not rotate or stops immediately
- Cause: The power of the main motor is not turned on; the heating time is insufficient, or one of the heaters does not work, resulting in excessive torque and overloading the motor.
- Handling method: check whether the main circuit is turned on, and turn on the power; check the temperature display of each section, confirm the preheating temperature rise time, check whether each heater is damaged or has poor contact, and eliminate it.
- Exhaust hole
- Reasons: The raw materials are not clean enough with impurities; the fast feeding speed makes the screw extrusion unstable; the plasticization temperature is not enough, screw extrusion becomes a problem.
- Treatment method: clean the raw materials before feeding or replace the filter; reduce the amount of feeding to make the plasticizing stable screw extrude smoothly; increase the plasticizing temperature (the temperature should not be too high to prevent burning plastic and affect the production quality).
- The main motor rotates, but the screw does not rotate
- Reason: The V bandwidth of the transmission is loose, and the wear and tear is slippery; the safety key is loosened or disconnected loosely.
- Treatment method: adjust the center distance of the V-belt, tighten the belt, or replace with a new V-belt; check the safety key, analyze the cause of the break, and replace the safety key.
- First, the purpose
- The purpose of standardized equipment operation and equipment maintenance is to ensure the normal operation of the equipment and extend its life, reduce maintenance costs and improve production efficiency.
- Application
- Only applicable to the production guidance of TPR EVA PVC / color masterbatch / non- cable material / rubber high filling engineering material produced by this company.
- Third, special duties
- The special equipment operators and maintenance personnel designated by the users must not operate illegally, and must be skilled in operating the equipment. They must supervise the responsibilities of unrelated personnel not to approach and disturb or damage the equipment.
- Fourth, the operating rules
- Turn on the power in turn, set the temperature and pay attention to whether the heating is normal.
- Clean the hopper and other units, inlet and outlet pipes, check the oil level and lubrication status of each gear oil, engine oil, high temperature butter, the gear oil of the new machine should be replaced at least six months at the latest, and the active part should be added with lubricant at least once a week.
- When the temperature is close to the set temperature, prepare the materials and start the main motor in turn.
- The temperature of the extruder must reach the set temperature, and the feeding device can be turned on to pour the remaining material in the cleaning material or the raw material cleaning screw until the new material is squeezed out, then suspend the extrusion, and quickly install the filter plate and mold in place. head. Only close the die head, and then turn on the main screw motor of the granulator after closing the die head. At this time, the operator should stay away from the die head to prevent the hard material from blocking the die and blasting until the die head squeezes out the silk material, and then close the die head. The pellet hood is connected to the cutter holder and locked.
- After the above operations are in place, turn on all fans in sequence>; vibrating screen>; pelletizer>; operation of the host.
- Adjust the granulator when the granulation is normal, and adjust the particle size by frequency conversion. Before the screw is discharged, the pelletizer must be kept rotating. If it is water-cooled spray pelletizing, the pelletizing hood must first pass water, and finally the main machine is turned on for formal production.
- Start the extrusion host and adjust the frequency conversion speed of the host and the pelletizer slowly and quickly according to the particle size requirements. Only when the two are coordinated can the particles cut out be more uniform and the particle output maximized.
- The operation sequence of stopping operations is the opposite of the sequence of starting production operations. First, turn off the main engine drive, then turn off the auxiliary machine power in turn, and finally clear the die head quickly to prevent the die cooling blockage (Special attention: the die head is discharged after each shift is stopped. The holes and filter plates must be completely cleared before they can be installed and produced again, otherwise the die head may explode due to blockage).
- Five, matters needing attention
- It is strictly forbidden to talk with unrelated personnel and equipment operators, and only one person can operate the button instructions on the electric control panel;
- Regularly check the insulation effect of the wire circuit, and pay attention to the warning content on the machine warning board at all times;
- Before the power distribution cabinet is powered off, non-professionals are strictly prohibited from opening the cabinet door and adjusting the cutter before the pelletizer is completely stationary;
- When the moving parts and the hopper are blocked, do not handle it with your hands or iron rods, but only with plastic sticks;
- Be careful of burns when contacting high temperature parts. When the kneader is working, it is strictly forbidden that staff members reach into the barrel to visit or chop materials;
- If there is a power failure during work, the motor circuits should be cut off and the machine's memory materials should be cleaned in time. The carbonization of the materials will affect the next production;
- When the machine fails, the machine should be stopped in the first time, and you should not claim it by yourself. And notify and wait for the mechanic to come to check the repair or telephone to guide the repair;
- Prevent all factors leading to machine damage and industrial accidents; strictly follow the standard operating methods to reduce the occurrence of failures or accidents.