What is the structure of screw plastic extrusion production line?

Ⅰ, the structure of plastic extrusion line

1, reducer system: reducer system using high-efficiency plastic machinery reducer box, transmission parts are used, ultra-high alloy carburized steel, combined with carburization, quenching, grinding tooth process manufacturing, key parts increased surface strengthening treatment, tooth surface strength HRC54-62, core hardness HRC30-40, gear 6 grade. A plastic extrusion line system with high speed, high torque, low energy consumption, low noise and other characteristics.

2、Feeding system: Adopt stainless steel twin-screw with agitator quantitative feeding system, feed evenly and accurately, no shelf material phenomenon.

3、Electrical control system: imported electrical components, human-machine interface control panel, "modular" control for each part of the equipment (can also be configured according to user requirements), clear multi-functional module structure, with safety interlocking devices (such as lubrication loss of pressure protection, head pressure protection, over-current protection, etc.), true reflection of the equipment operating conditions. Accurate control, high sensitivity and easy operation. Heating system: using cast aluminum, cast copper, ceramic resistance heating device, uniform heating, fast temperature rise, high precision temperature control.

4、Temperature control system: Adopt double-channel temperature control meter, with sensitive response, convenient temperature setting and adjustment, and high temperature control precision.

5、Cooling system: water cooling, oil cooling and wind cooling are adopted, with rapid, even and good cooling effect.

6、Vacuum system: built-in vacuum system, vacuum degree can reach -0.09Mpa, thus ensuring full plasticization of materials and improving product quality.

7、Auxiliary machinery: according to the shape, material, size and weight of different plastic products, choose different functions of auxiliary equipment.

Ⅱ, plastic extrusion line maintenance

1, routine maintenance is a regular routine work, does not account for the equipment running hours, usually completed during the drive. The focus is on cleaning the machine, lubricating the moving parts, tightening the easy to loosen the threaded parts, timely inspection, adjustment of the motor, control instruments, the work parts and pipelines, etc.

2, regular maintenance is generally in the screw extruder after continuous operation 2500-5000h stop, the machine needs to pull out the screw to check, measure, identify the wear of the main parts, replace the parts that have reached the specified wear limit, repair the damaged parts.

3, the extruder is not recommended to run empty to avoid damage to the screw and barrel.

4, screw extruder operation if the occurrence of abnormal sound, should immediately stop, check or repair.

5, strictly prevent metal or other debris from falling into the hopper to avoid damage to the screw and barrel. To prevent ferrous debris from entering the barrel, you can install a magnetic frame at the barrel filling port; or sieve the material beforehand.

6, when the extruder needs to stop using for a long time, should clean out the screw barrel and die internal material, the screw should be placed in the barrel do not take out, the head and other working surfaces coated with anti-rust grease.

7, regularly calibrate the temperature control instrument, check the correctness of its adjustment and the sensitivity of the control.

8, the screw extruder gearbox maintenance and general standard gearbox the same. The main thing is to check the gears, bearings and other wear and failure. Reducing box should use the machine manual lubricant, according to the specified oil height to join the oil, too little oil, poor lubrication, reduce the service life of the parts; too much oil, heat, energy consumption, oil is easy to deteriorate, the same lubrication failure, resulting in damage to the parts of the consequences.

9, the inner wall of the cooling water tube of the machine barrel is easy to scale, should be regularly cleared of scale, to ensure that the waterway is smooth. Distilled water should be added to the cooling water tank.

10, the drive screw rotation of the DC motor to focus on checking brush wear and contact, the insulation resistance of the motor whether the value of the specified value should also be measured regularly. In addition, we should check whether the connection line and other parts are rusted, and adopt protective measures.

11. A person is responsible for the maintenance of the equipment. A detailed record of each maintenance and repair should be included in the factory equipment management file.

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