How to maintain the sheet machine daily?

Use the plastic sheet extruder correctly and rationally to give full play to the efficiency of the machine, maintain a good working condition, and prolong the service time of the machine. The use of plastic sheet extruder includes a series of links such as installation, adjustment, commissioning, operation, maintenance and repair of the machine. However, the working system is the extrusion system, and special attention should be paid to its characteristics when using the screw extruder. The installation, adjustment and commissioning of the machine are generally clearly stipulated in the extruder's operating instructions. Here, the use method, maintenance and maintenance of the extruder are briefly described as follows:

1. How to use the extruder:

Operators must be familiar with the structural characteristics of the extruder they are using, especially the structural characteristics of the screw, the characteristics of the heating and cooling control instruments, the characteristics of the machine head and the assembly conditions, etc., in order to correctly grasp the extrusion process conditions, correct operate the machine. The use of extruding different plastic products is different, but there are also similarities.

1. Preparations before driving

(1) Plastics for extrusion molding. The raw materials should meet the required drying requirements, and further drying is required if necessary. The raw materials are sieved to remove agglomerates and mechanical impurities.

(2) Check whether the water, electricity and gas systems in the equipment are normal, ensure that the water and gas paths are unobstructed and leak-proof, whether the electrical system is normal, whether the heating system, temperature control, and various instruments work reliably; auxiliary machines are empty at low speed Trial operation to observe whether the equipment is running normally; start the vacuum pump of the setting table to observe whether the work is normal; lubricate the lubricating parts of various equipment. If a fault is found, remove it in time.

(3) Install the machine head and the setting sleeve. According to the variety and size of the product, select the head specification. Install the handpiece in the following order.

①The machine head should be assembled together and installed on the extruder as a whole.

②Before assembling the machine head, wipe off the grease applied during storage, carefully check the cavity surface for bumps, scratches and rust spots, perform necessary polishing, and then apply a layer of silicone oil on the surface of the runner.

③ Assemble the plates of the machine head together in sequence, apply high temperature grease to the threads of the bolts, and then screw on the bolts and flanges.

④ Place the perforated plate between the flanges of the machine head to ensure that the perforated plate is pressed without overflowing.

⑤ The horizontal position of the die should be adjusted before tightening the fastening bolts of the connecting flange of the die head and the extruder. The level of the square die head can be adjusted horizontally, and the circular die head should be based on the rubber bottom surface of the stereotyped model. The bottom surface of the mold is leveled.

⑥ Tighten the connecting flange bolts, tighten the machine head fastening bolts, install the heating ring and thermocouple, and pay attention to the heating ring and the outer surface of the machine head.

⑦ Install the setting sleeve and adjust it in place, check whether the main engine, the setting sleeve and the line of the tractor are aligned. After adjustment, tighten the fixing bolts. Connect the water pipes and vacuum pipes of the setting sleeve.

⑧Turn on the heating power, and evenly heat the machine head and machine body. Open the cooling water at the bottom of the hopper and the gear box and the water inlet valve of the exhaust vacuum pump. When heating and heating, the temperature of each section is first adjusted to 140 ° C, and when the temperature rises to 140 ° C, the temperature is kept for 30-40 minutes, and then the temperature is raised to the normal production temperature. When the temperature rises to the temperature required for normal production, keep it for about 10 minutes, so that the temperature of each part of the machine tends to be stable, and then the production can be started. The length of holding time varies according to different models of extruders and varieties of plastic raw materials. Keep warm for a period of time to make the temperature inside and outside the machine consistent, so as to avoid the indicator indicating that the temperature has reached the required temperature, but the actual temperature is low. Causes axial force overload and damages the machine.

⑨ Feed the raw materials used for driving into the hopper for use.