CN205086336U - Rubber developments plastify extruder - Google Patents

Abstract

The utility model belongs to the technical field of polymer material processing machinery, and relates to a rubber dynamic plasticizing extruder. The extruder is composed of head, barrel, plasticizing system, transmission system, etc. The plasticizing system is located at the rear end of the extruder head and close to the end of the screw and is driven by hydraulic pressure. The plasticizing system includes two hydraulic cylinders. , two hydraulic connecting rods, two plasticizing blocks, the hydraulic cylinders are respectively distributed at the upper and lower ends of the machine barrel, and the plasticizing blocks are installed at the lower end of the hydraulic connecting rods. The extruder plasticizes the rubber through the reciprocating motion of the hydraulic mechanism in the plasticizing system, has a simple structure and good effect, and can be widely used in the rubber and plastic industry.

Description

A rubber dynamic plasticizing extruder

Technical field:

The utility model belongs to the technical field of polymer material processing machinery, and particularly relates to a rubber dynamic plasticizing extruder.

Background technique:

Rubber extruder is a basic equipment in the rubber industry, which plays a very important role in the production process of tires and rubber products. The rubber extruder first appeared in 1851 by the British Guttabo Company using a plunger extruder to manufacture submarine cables. The development of foreign rubber extruders has experienced plunger extruders, screw type hot feed Extruder, ordinary cold feed extruder, main and auxiliary thread cold feed extruder, cold feed exhaust extruder, pin cold feed extruder, compound extruder and other stages. Since the 1950s in China, some domestic rubber machinery manufacturers have successively developed hot-feed extruders, and since 1984, they have conducted research on pin cold-feed extruder technology. At present, pin-type cold-feed extruders have been developed. Become the leading product in the extruder market.

Mastication is a process of rubber processing, which refers to the use of mechanical or chemical methods to reduce the relative molecular weight and viscosity of raw rubber to improve its plasticity and obtain appropriate fluidity to meet the needs of further processing of mixing and molding. The rubber extruder is to use the mechanical method to plasticize the rubber. The process of extruding the rubber from the rubber extruder is generally divided into three sections: the conveying section, the plasticizing section, and the metering section. The conveying section is located at the lower end of the hopper. The rubber is transported to the plasticizing section. The plasticizing section breaks the molecular chain of the rubber through the mechanical shear force between the screw and the barrel and the action of high temperature heat, thereby reducing the viscosity of the rubber and increasing the fluidity of the rubber. The first stage is to keep the temperature of the rubber material and quantitatively deliver the melt rubber material to the machine head. The rubber material is further plasticized and homogenized at the head of the extruder and a certain pressure is applied to the rubber material to ensure the excellent compactness and quality of the rubber product.

For the traditional extruder, the rubber is masticated by the shear force between the extruder screw and the barrel, but the Mooney viscosity of the rubber remains the same when the rubber enters the head of the extruder. A lot of this causes the difficulty of rubber molding and affects the production efficiency. Moreover, when the viscosity of the rubber material at the head part is high, more pressure is required when the rubber material is extruded through the die, and it may cause accumulation of rubber at the head part, so that the rubber material stays in the screw part of the extruder for too long If the temperature of the long rubber material rises too high, the phenomenon of rubber burning will affect the quality of rubber products.

Invention content:

The purpose of the present invention is to overcome the deficiencies of the prior art, seek to design and provide a rubber dynamic plasticizing extruder, which can effectively reduce the Mooney viscosity of the rubber at the machine head and provide a certain pressure to make the rubber The material can have better fluidity, and the resulting rubber product is more dense.

The present invention is different from the traditional rubber extruder. This rubber dynamic plasticizing extruder adds a dynamic plasticizing system on the basis of the original rubber extruder. to the end of the screw. The dynamic plasticizing system is driven by hydraulic pressure. The plasticizing system has two hydraulic cylinders located at the upper and lower ends of the machine head. The lower part of the connecting rod in the hydraulic cylinder has a plasticizing block. The operation realizes the dynamic plasticization of the rubber compound during the extrusion process, which further reduces the viscosity of the rubber compound by breaking the macromolecular chain. When the temperature is high, although the effect of mechanical force is reduced, the mechanical force plays a strong activation role to make the rubber material fully contact with oxygen, so that the rubber molecule hydroperoxide is broken into molecules with a relatively small molecular weight when encountering oxygen; Moreover, this reciprocating extrusion also provides a certain pressure to the rubber material so that the rubber material can be kneaded again and the pressure provided is conducive to the extrusion of the rubber material and the improvement of the quality of the rubber product.

A rubber dynamic plasticizing extruder according to the present invention, its main structure includes: machine head 1, hydraulic cylinder oil delivery pipe 2, hydraulic cylinder 3, hydraulic cylinder connecting rod 4, plasticizing block 5, fastening bolt 6, machine Cylinder 7, screw rod 8, feeding device 9, bearing 10, reduction box 11, base 12, bracket 13; machine head 1 and machine barrel 7 are connected by fastening bolt 6, and machine barrel 7 is installed on feeding device 9 On the top, a serial axial circulation cooling channel is formed in the wall of the machine barrel, the plasticizing block 5 is installed on the lower end of the hydraulic cylinder connecting rod 4, the right end of the screw rod 8 is installed with a bearing 10 and is linked with the gear in the reduction box 11 through a pin, the machine The head and the machine barrel are linked with the support 13, and the support is fixed on the base 12, and the whole constitutes a rubber dynamic plasticizing extruder.

Description of drawings:

Figure 1 is the overall schematic diagram of the rubber dynamic plasticizing extruder

Figure 2 is a partial sectional view of the rubber dynamic plasticizing extruder

Figure 3 is a cross-sectional view of the head of the rubber dynamic plasticizing extruder

Among them, 1 is the machine head, 2 is the oil delivery pipe of the hydraulic cylinder, 3 is the hydraulic cylinder, 4 is the connecting rod of the hydraulic cylinder, 5 is the plasticizing block, 6 is the fastening bolt, 7 is the barrel, 8 is the screw, and 9 is the feeding device , 10 is a bearing, 11 is a reduction box, 12 is a base, and 13 is a support.

detailed description:

The present invention will be further described below with reference to the accompanying drawings and in conjunction with specific embodiments.

What the present invention provides is a kind of rubber dynamic plasticizing extruder, as shown in Fig. 2 in the present invention, screw rod 8 is connected with the gear in the reduction box 11 by key, and the nose 1 of extruder is connected with machine barrel, feeding device 9 and the machine barrel, and other joints are all connected by fastening bolts, and the plasticizing block 5 is installed on the lower end of the hydraulic cylinder connecting rod. Turn on the power, the gear in the reduction box drives the screw to rotate; the hydraulic cylinder is filled with oil, and the connecting rod of the hydraulic cylinder makes reciprocating motions 2-10 times per second. The rubber is added from the feeding device, and the conveying section of the screw starts to eat the material and transport the rubber to the plasticizing section. Due to the reduction of the pitch of the plasticizing section, the rubber begins to be squeezed and causes friction between the rubber and the barrel wall. The rubber material is sheared and heated by friction to achieve plasticization of the rubber material. The rubber material enters the metering section through the plasticizing section and then keeps the temperature of the rubber material and is transported to the machine head. The plastic at the machine head The chemical system starts to work on the rubber material, kneading the rubber material through the reciprocating extrusion of two hydraulic mechanisms to reduce the Mooney viscosity of the rubber material to realize the secondary plasticization of the rubber material, and the reciprocating action of the hydraulic mechanism returns to the rubber material A certain pressure makes the rubber compound easier to be extruded and the resulting rubber product is more dense and of better quality.

The present invention overcomes the deficiencies of the prior art and designs a rubber dynamic plasticizing extruder. The present invention designs a dynamic plasticizing system at the machine head without changing the main structure of the traditional extruder, and the structure is simple and effective Good, can be widely used in the rubber and plastic industry.

Claims (3)

1. A rubber dynamic plasticizing extruder, characterized in that: the main body comprises a head (1), a hydraulic cylinder oil delivery pipe (2), a hydraulic cylinder (3), a hydraulic cylinder connecting rod (4), a plasticizing block ( 5), fastening bolts (6), machine barrel (7), screw rod (8), feeding device (9), bearing (10), reduction box (11), base (12), bracket (13); The machine head (1) and the machine barrel (7) are connected by fastening bolts (6), and the machine barrel (7) is installed on the feeding device (9). Road, the plasticizing block (5) is installed to the lower end of the hydraulic cylinder connecting rod (4), the bearing (10) is installed on the right end of the screw rod (8) and is connected with the gear in the reduction box (11) through pins, and the machine head and machine barrel are connected with the The support (13) is linked, and the support is fixed on the base (12), and the whole constitutes a rubber dynamic plasticizing extruder. 2. A kind of rubber dynamic plasticizing extruder according to claim 1, characterized in that: the dynamic plasticizing system which is positioned at the rear section of the extruder head close to the end of the screw rod includes two hydraulic cylinders (3 ), a hydraulic cylinder connecting rod (4), and a plasticizing block (5); the two hydraulic cylinders are respectively located at the upper and lower ends of the machine head, and the plasticizing block is installed at the lower end of the connecting rod in the two hydraulic cylinders. 3. A rubber dynamic plasticizing extruder according to claim 1, characterized in that: the plasticizing system is driven by hydraulic pressure, and the connecting rod of the hydraulic cylinder reciprocates 2-10 times per second to realize the plasticizing dynamic plasticization.