Preparation before use of wire extrusion machine

Taizheng is a professional wire extrusion machine manufacturer in China. Many customers will ask about the operation method of wire extrusion machine. Now Taizheng will first explain the preparation work before wire extrusion machine.

Operators must be familiar with the structural characteristics of the cable extrusion machine they are operating, especially to correctly grasp the structural characteristics of the screw, heating and cooling control instrument characteristics, head characteristics and assembly conditions, etc., in order to correctly grasp the extrusion process conditions. To operate the machine.

Preparation before use of wire extrusion machine

(1) Plastics used for extrusion molding. The raw materials should meet the required drying requirements, and further drying should be done 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, to ensure that the water and gas paths are unblocked and leak-free, whether the electrical system is normal, whether the heating system, temperature control, and various instruments are working reliably; low-speed test of the auxiliary machine empty car Operate and observe whether the equipment is operating normally; start the vacuum pump of the sizing table to observe whether it works normally; add oil to lubricate the lubricated parts of various equipment. If any fault is found, remove it in time.

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

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

② Before assembling the machine head, wipe off the grease applied during storage, carefully check the surface of the cavity for bruises, 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 in order, apply high-temperature grease to the threads of the bolts, and then tighten the bolts and flanges.

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

⑤ Adjust the horizontal position of the die before tightening the fastening bolts of the connecting flange between the die head and the extruder. The square die head can be adjusted horizontally, and the round die head should be based on the bottom surface of the finalized 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, pay attention to the heating ring to be close to the outer surface of the machine head.

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

⑧ Turn on the heating power to heat up the machine head and the machine evenly. At the same time, 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, the temperature of each section is first adjusted to 140°C, and when the temperature rises to 140°C, the temperature is kept for 30-40min, and then the temperature is raised to the temperature during normal production. When the temperature rises to the temperature required for normal production, keep it for about 10 minutes to stabilize the temperature of each part of the machine before it can start production. The length of the heat preservation time varies according to different types of extruders and types of plastic raw materials. Keep the temperature for a period of time to keep the temperature inside and outside the machine consistent, so as to prevent the meter indicating that the temperature has reached the required temperature, but the actual temperature is too low. At this time, if the material is put into the extruder, the actual temperature is too low and the melt viscosity of the material is too high Causes axial force overload and damages the machine.

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