Special extruder for manufacturing rubber

Abstract

The invention relates to a special extruder for manufacturing rubber, which comprises a base, a temperature control portion, a screw device, a driving motor, a speed reducer and a controller portion. The screw device comprises an outer cylinder, an inner cylinder and a screw, wherein the outer cylinder is fixed onto the base, the inner cylinder is arranged in the outer cylinder, and the screw is arranged in the inner cylinder. A spiral cold water injection cavity is arranged between the inner wall of the outer cylinder and the outer wall of the inner cylinder, a water inlet and a water outlet are respectively arranged on the outer cylinder and communicated with the cold water injection cavity, a cooling device comprises at least one water tank and coolers mounted on the water tanks, two ends of each water tank are connected with a water inlet pipe and a water outlet pipe respectively, the water inlet pipe is communicated with the water outlet, and the water outlet pipe is communicated with the water inlet. The cooling device is added into the screw device of the special extruder for manufacturing the rubber, the temperature of the screw and the rubber can be effectively reduced during extrusion of the rubber, heat exchange rate is increased, and premature melting of the rubber is avoided.

Description

technical field [0001] The invention relates to the field of rubber manufacture, in particular to a special extruder for rubber manufacture. Background technique [0002] Rubber extruder is a basic equipment in the rubber industry and one of the key equipment that affects product quality. It plays a very important role in the production process of tires and rubber products. The development of foreign rubber extruders has experienced plunger extruders, screw-type hot-feed extruders, ordinary cold-feed extruders, primary and secondary thread cold-feed extruders, cold-feed exhaust extrusion Machine, pin cold feed extruder, compound extruder and other stages. [0003] At present, in the production process of many products, the screw-type hot-feed extruder is still used in the production of tires for the extrusion of various treads and various types of rubber, as well as in the production of rubber hoses, cables and other rubber products. It is used for the extrusion of rubber ...

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Problems solved by technology

[0003] At present, in the production process of many products, the screw-type hot-feed extruder is still used in the production of tires for the extrusion of various treads and various types of rubber, as well as in the production of rubber hoses, cables and other rubber products. It is used for the extrusion of rubber wrapping and rubber base. The rubber material fed by it must be heat-refined, and the material should be fed uniformly and stably. The constant-speed material temperature should be kept at 50-70°C. Extruder, when the material enters the extrusion section, the temperature of the material is difficult to control, resulting in low production quality of the material

[0004] In rubber products, it is very important to ensure good density of the product. Now many screw extruders use the same thread width on the screw. When the rubber material is discharged from the machine head, it is easy to generate air bubbles in the rubber material. The density of the extruded product is low, the pressure of the rubber material gradually increases from the feeding section, and the cross-sectional area of ​​the thread groove increases in the exhaust section, which may easily cause the thread groove to not be filled and gas will be discharged from the exhaust port.

[0005] In addition, during the extrusion process of the rubber material, due to the high temperature of the screw of the extruded material, it is easy to cause the rubber body melt to melt prematurely in the conveying section, resulting in early decomposition. In order to reduce the temperature of the rubber material, most of the methods used Several cavities are set up around the cylinder as cooling water cavities. After adding cooling water, the rubber material of the screw is cooled. Because of this cooling method, after the temperature of the cooling water reaches a certain temperature, new injection is required. Cooling water, which is very troublesome to operate and wastes labor

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