CN104924574A - A hydraulically driven rubber dynamic plasticizing extrusion method and equipment - Google Patents

Abstract

The invention belongs to the technical field of polymer material processing machinery, and relates to a hydraulically driven rubber dynamic plasticizing extrusion method and equipment. The extrusion method plasticizes the rubber material through the reciprocating motion of the hydraulic mechanism to reduce the Mooney viscosity. The extrusion equipment is composed of head, barrel, plasticizing system, transmission system, etc. The plasticizing system is located at the head of the extruder and is driven by hydraulic pressure, including two hydraulic cylinders, hydraulic connecting rods, and plasticizing blocks. The hydraulic cylinders are respectively distributed at the upper and lower ends of the barrel, and the plasticizing block is installed at the lower end of the hydraulic connecting rod. The method and the device have simple structure and good effect, and are widely used in rubber and plastic industries.

Description

A hydraulically driven rubber dynamic plasticizing extrusion method and equipment

Technical field:

The invention belongs to the technical field of polymer material processing machinery, and in particular relates to a hydraulically driven rubber dynamic plasticizing extrusion method and equipment.

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, to seek to design and provide a hydraulically driven rubber dynamic plasticizing extrusion method and equipment, which can effectively reduce the Mooney viscosity of the rubber at the machine head and Provide a certain pressure so that the rubber compound can have better fluidity and the resulting rubber product will be 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. at the end of the screw. The dynamic plasticizing system is driven by hydraulic pressure. It 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, which can be realized by reverse reciprocating operation through the two hydraulic pressures. The dynamic plasticization of the rubber during the extrusion process breaks the macromolecular chain to further reduce the viscosity of the rubber, because although the effect of the mechanical force is reduced when the temperature is high, the mechanical force acts as a strong activation to make the rubber and Oxygen is fully contacted, so that the rubber molecule hydroperoxide is broken into molecules with a relatively small molecular weight when encountering oxygen; and this reciprocating extrusion also provides a certain pressure for the rubber material so that the rubber material can be kneaded again and provided. The pressure helps to extrude the compound and improve 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 ways:

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

The present invention provides a hydraulically driven rubber dynamic plasticizing extrusion method and equipment. As shown in Figure 2, the screw rod 8 in the present invention is connected with the gear in the reduction box 11 through a key, and the head 1 of the extruder is connected to the machine barrel. , the feeding device 9 and the machine barrel, and other joints are all connected by fastening bolts, and the plasticizing block 5 is installed at 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 feeding 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 the plasticizing effect on 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 hydraulically driven rubber dynamic plasticizing extrusion method and equipment. The present invention designs a dynamic plasticizing system at the machine head without changing the main structure of the traditional extruder. , simple in structure and good in effect, and can be widely used in rubber and plastic industries.

Claims (3)

1. a hydraulic-driven rubber dynamic plasticizing extruder method and apparatus, is characterized in that: main part comprises head 1, hydraulic cylinder petroleum pipeline 2, hydraulic cylinder 3, hydraulic cylinder connecting rod 4, plasticizing block 5, fastening bolt 6, machine barrel 7, screw rod 8, drawing-in device 9, bearing 10, reduction box 11, pedestal 12, support 13; Link with fastening bolt 6 between head 1 with machine barrel 7, machine barrel 7 is arranged on drawing-in device 9, tandem type shaft is shaped with to circulating cooling runner in barrel wall, plasticizing block 5 is installed to the lower end of hydraulic cylinder connecting rod 4, screw rod 8 right-hand member is installed bearing 10 and is linked by pin and the gear in reduction box 11, head and machine barrel link with support 13, and support is fixed on pedestal 12, wholely constitute rubber dynamic plasticizing extrusion equipment.

2. a kind of hydraulic-driven rubber dynamic plasticizing extruder method and apparatus according to claim 1, is characterized in that: the dynamic plasticizing system of head feed end i.e. screw rod end that is positioned at is comprising two hydraulic cylinders 3, cylinder pressure connecting rod 4, plasticizing block 5; Two hydraulic cylinders lay respectively at the two ends up and down of head, and plasticizing block is arranged on the lower end of connecting rod in two hydraulic cylinders.

3. a kind of hydraulic-driven rubber dynamic plasticizing extrusion equipment according to claim 1, it is characterized in that: plasticizing system is completed by hydraulic-driven, two reciprocal 2-10 time per second of hydraulic mechanism reverse operatings, realize the dynamic plasticizing of sizing material.