The goal of energy saving and emission reduction of plastic granulator

　 The appearance of plastic granulator machine can be said to achieve the function of turning waste into treasure. In fact, in the production process, the working state should pay attention to the energy-saving effect of machinery, reduce production costs, and achieve true environmental protection.

　　In the actual operation process, the energy-saving measures of the granulator are mainly concentrated on one is the power part and the other is the heating part. Most of the power part energy-saving uses frequency converters. The energy-saving method is by saving the residual energy consumption of the motor.

Most of the energy saving in the heating part is to use electromagnetic heaters to save energy. The energy-saving rate is about 30%-70% of the old-style resistance coil. Compared with resistance heating, the electromagnetic heater has an extra layer of insulation, and the heat energy utilization rate increases; direct effect The heating of the feed tube reduces the loss of heat transfer heat energy; the heating speed is more than a quarter faster, which reduces the heating time.

　　The heating speed is fast, the production efficiency is improved, and the motor is in a saturated state, which reduces it, and the power loss caused by high power and low demand. Four of these are also the reasons for improving the energy saving of plastic granulators by as much as 30%-70%.

Utilization of plastic pellet making machine

The plastic pellet making machine is an important part of the plastic recycling process, and because it needs to be shaped for plastic, the mechanical structure is special. If you do not pay attention to the use of mechanical parts, it is easy to cause mechanical damage and production safety accidents.

　　 1. The granulator is going to run forward; avoid reversing.

　　 2. The granulator should not run on an empty stomach. The machine must be heated and fed to run, so as to avoid sticking (shaft holding).

　　 3. It is strictly forbidden to enter iron and other debris in the air inlet of the pelletizer. So as not to cause accidents and affect production.

　　 4. Pay attention to the temperature change of the body at any time. When touching the sliver with clean hands and not sticking your hands, you should immediately heat up. It is normal until the sliver touches the hand.

　　 5. When the bearing parts of the reducer are burnt, or accompanied by noise, they should be repaired in time and refueled.

　　 6. When the bearing parts at both ends of the bearing housing of the main engine are hot or have noise, stop the machine for maintenance and fill with butter. In normal operation, the bearing room is greased every 5-6 days.

　　 7. Pay attention to find out the operation rules of the machine; for example the temperature of the machine is high and low, the speed is fast and slow, and it can be dealt with in time according to the situation.

　　 8. When the body of the plastic pellet making machine is unstable, you should pay attention to check whether the gap between the couplings is too tight, and it should be loosened in time.

Reliable plastic pellet machine

　It is another very difficult thing to ensure that the entire system works normally on site. In the past, some units have tried several times to develop automatic controllers for plastic pellets machine, but none have succeeded.

One of the main reasons is that the working environment of the automatic controller of the granulator is very bad. Many types of equipment are in a workshop. Various motors start and stop continuously. The power in the motor can reach more than 13OkW, so the interference is very serious.

These interferences are fatal to the computer system. If the system fails, the system will crash. Once the controller crashes, the consequences can be imagined. Therefore, it is very important to fight interference. In response to the above situation, we have mainly taken the following measures:

　　All input and output, whether it is digital or analog, are photoelectrically isolated. The optical isolation of the switch is relatively simple, and the electrical isolation of the analog is more complicated. Both the cost and the linearity must be guaranteed. We chose a circuit that uses two optical couplings in series and uses the symmetry of the optical coupling to compensate, which not only ensures the accuracy but also reduces the cost.

　　Use one-point grounding for the analog and digital grounds on the printed circuit board wiring. Try to ensure that no two ground wires are parallel. Separate the digital and analog circuits as much as possible to avoid mixed wiring.

　　 Switching power supply with strong anti-interference ability is used as the control power supply. It can ensure normal operation within the range of AC input voltage 120V-27OV.

　　 Arrange the signal lines reasonably and minimize the length of the lines.

　　 After adopting the above measures, the effect is very obvious, and the plastic pellet machine has stood the test on the spot.

Summary of basic information of the new granulator

　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.

　　⒈Extrusion system The extrusion system includes a hopper and a machine head. The plastic is plasticized into a uniform melt through the extrusion system, and under the pressure established in this process, the screw is continuously extruded from the extrusion head.

　　1.1 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 generally made of high-strength corrosion-resistant alloy steel.

　　 1.2 Barrel: It is a metal cylinder, generally made of alloy steel or composite steel pipe lined with alloy steel lined with heat resistance, high compressive strength, strong wear resistance, and corrosion resistance. The barrel cooperates with the screw to realize the crushing, softening, melting, plasticizing, exhausting and compacting of the plastic, and continuously and uniformly transport the rubber material to the molding system. The length of the general barrel is 15~30 times its diameter so that the plastic is fully heated and fully plasticized.

　　1.3 Hopper: The bottom of the hopper is equipped with a cutting device to adjust and cut off the material flow, and the side of the hopper is equipped with a sight hole and a calibration metering device.

　　1.4 Machine head and mold: The machine head is composed of an alloy steel inner sleeve and a carbon steel outer sleeve, and a molding die is installed in the machine head. The role of the machine head is to transform the plastic melt in rotary motion into parallel linear motion, which is evenly and smoothly introduced into the mold sleeve and gives the plastic the necessary molding pressure.

The plastic is plasticized and compacted in the barrel and flows into the die forming mold through the neck of the nose through the porous filter plate along a certain flow channel. A continuous and dense tubular coating is formed around the core wire. In order to ensure that the plastic flow channel in the machine head is reasonable and eliminate the dead corner of the accumulated plastic, a shunt sleeve is often arranged. In order to eliminate the pressure fluctuation during plastic extrusion, there are also pressure-equalizing rings. The machine 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. The torque and speed required for the screw during the extrusion process are usually composed of motors, reducers, and bearings.

　　⒊Heating and cooling device Heating and cooling are the necessary conditions for the plastic extrusion process.

　　 3.1 In recent years, extruders usually use 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 externally heats the plastic in the cylinder to make it warm up to reach the temperature required for the process operation.

　　3.2 The cooling device is set to ensure that the plastic is within the temperature range required by the process. Specifically, in order to eliminate the excess heat generated by the shear friction of the screw rotation, to avoid the temperature being too high to cause the plastic to decompose, scorch or styling difficult. 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 ones are mostly water cooling or a combination of two forms. , Stabilize the amount of glue, and improve product quality; but the cooling at the hopper is to strengthen the conveyance of solid materials and prevent the plastic particles from sticking to the material port due to temperature rise, and second, to ensure that the transmission part works normally.

Daily maintenance of plastic recycling pellet machine

The "daily maintenance" of the plastic recycling pellet machine is performed by the production line operator, and it must be carried out every time the shift is handed over and must be recorded. The main contents are as follows:

  1. Check the production record and product quality record of the last shift. Check whether the operation of the transmission system of the equipment is normal; whether the lubricating oil level and oil temperature of the reduction gearbox and transmission are normal, whether there is any leakage of the lubricating oil; whether the belt and the chain are slack. produce;

  2. Carefully monitor and check the rotation of the screw and other rotating parts (motor, gearbox, gearbox, water pump, vacuum pump, etc.) for abnormal noise and abnormal vibration; touch and check whether the temperature of the bearing end cover is normal, check the hopper seat Whether the temperature is normal; check whether the motor safety protection device is in place; whether the belt and chain safety protection device is in place. If any abnormal situation is found, it should be notified to the mechanic repairer in time for repair. After the abnormal situation is eliminated, it can take over to continue production;

  3. Check the meter showing temperature, pressure, vacuum, current, voltage, etc., and confirm whether the displayed data is correct and stable. If problems are found, adjust and deal with them immediately. If the treatment is difficult, notify the instrument technician or electrician to repair;

  4. Check the cooling water and compressed air ports for leaks and deal with problems immediately;

  5. Add lubricating oil (grease) to each oil cup and nipple according to regulations;

  6. Wipe the machine to remove dust and oil and clean the workplace;

  7. Make succession records, especially repair records.

What are the raw materials of plastic pellet machine

The raw material of the plastic pellet machine is waste plastic, which mainly has the following three aspects:

1. Waste plastics produced when producing new plastics

    1. During the maintenance, the plastic or unqualified plastic attached to the new plastic production equipment;

    2. Cleaning the plastic extruder waste and unqualified compounding plastic during the compounding process;

    3. Floor material during transportation and storage;

    4. The waste material generated during the molding process is commonly known as scrap material;

    These raw materials account for the smallest proportion of the entire waste plastic, but the quality of the particles made by the plastic pellet machine is also the best.

2. Waste plastics generated in secondary processing

     Secondary processing is usually the semi-finished plastic products purchased from the molding processing plant through transfer, sealing, thermoforming, mechanical processing, etc. into finished products, the waste generated here is often more difficult to handle than the waste generated by the molding processing plant.

For example, the wastes after printing and electroplating are very difficult and costly to remove the printed layer and electroplated layer. The value of recycled materials obtained by direct crushing or granulation is much lower. The waste edges and waste pears produced by thermoforming and mechanical cutting are relatively easy to recycle and regenerate, and the value of the recycled materials is relatively high.

3. Waste plastics generated after the use

     This type of waste plastic has a wide range of sources and complex usage conditions and must be treated before it can be recycled. Such waste plastics include:

    1. Waste plastics produced in agriculture, such as mulch film, greenhouse film, fertilizer bag, etc.;

    2. Waste plastics in urban household garbage, such as fresh-keeping bags, shopping bags, etc.;

    3. Packaging materials, foam shockproof pads, etc. in the home appliance industry;

    4. Building materials, pipes, etc. in the construction industry;

    5. Shrink film and stretch film in the filling industry;

    6. Bumpers and battery boxes removed from scrapped vehicles;

    7. Turnover boxes and egg trays in the food processing industry;

    8. Containers and waste man-made fiber yarns in the textile industry;

    9. Bags and barrels used in the chemical industry;

    10. Fishing nets and floats in fisheries.

    There are many types of waste plastic products in domestic garbage, and they are actually the main source of raw materials for plastic pellet machines. Including all kinds of packaging products, such as bottles, films, irrigation, etc.; daily-use products, such as barrels, basins, cups, plates, etc.; toy accessories, entertainment products, clothing and footwear, strapping ropes, packing straps, woven bags, Health care supplies, etc.