CN204869587U - A twin-screw extruder for molding plastic pellets - Google Patents

Abstract

A double-screw extrusion device for plastic particle forming comprises a main motor, a feeding hopper, a charging barrel, a die orifice, a cooling water tank, a granulator, a vibration material sieve, an air blower, a finished product bin and a base, wherein the main motor is arranged on the base, one side of the base, which is close to the main motor, is provided with a hopper support, the hopper support is provided with the feeding hopper, one side of the feeding hopper is provided with the feeding motor, a discharge port of the feeding hopper is connected with the charging barrel, the charging barrel is internally provided with double screws, the tail end of the charging barrel is provided with the extrusion die head, the die orifice is arranged on the die head, one side of the die orifice is provided with the cooling water tank, the lower end of the granulator is provided with the vibration material sieve, the vibration material sieve is connected with a pipeline arranged at the lower end of the vibration material sieve, the lower end of the finished product bin is provided with the air blower, the automation degree is high.

Description

A twin-screw extruder for molding plastic pellets

technical field

The utility model relates to the field of plastic processing equipment, in particular to a twin-screw extruder for forming plastic granules.

Background technique

Twin-screw extruders are widely used in the blending and modification of polymer materials such as general plastics, engineering plastics, and thermoplastic rubbers, such as filling, reinforcement, and toughening, as well as in the processing fields of special fibers and special adhesives. The melt (or viscous fluid) of the material is formed through a die of a certain shape under the extrusion of the extruder screw. The product is a continuous profile with a constant cross-sectional shape. At present, about 50% of thermoplastic products are formed by extrusion. Based on extrusion molding, combined with inflation, stretching and other technologies, it has been developed into extrusion-blow molding and extrusion tenter molding to manufacture products such as hollow blow molding and biaxial stretching films. The currently used biaxial The power of the transmission box of the screw extruder is relatively low, and the production capacity of the extruder is small. However, if a high-power transmission box is used, the overall structure, assembly accuracy, screw structure, torque, and strength of the twin-screw extruder must be in line with the In order to ensure the stability of equipment operation, reduce the failure rate, improve product quality and performance, and greatly increase production capacity.

Contents of the invention

Aiming at the deficiencies of the prior art, the utility model provides a twin-screw extrusion device for pelletizing plastics.

The technical scheme of the utility model is: a twin-screw extrusion device for forming plastic granules, including a main motor, a feeding motor, a feeding hopper, a barrel, a die opening, a cooling water tank, a granulator, a vibrating screen, and a blower , a finished product warehouse, and a base, the main motor is arranged on the base, the main motor is connected to the transmission device, a hopper support is provided on the side of the base close to the main motor, and a feed hopper is provided on the hopper support for feeding A feeding motor is arranged on one side of the hopper, and a feeding screw is arranged in the feeding hopper, and the outlet of the feeding hopper is connected with the barrel, and a twin screw is arranged in the barrel, and the The twin-screw is connected to the output shaft of the transmission device. The end of the barrel is provided with an extrusion die, and a die is provided on the die. The resin material is extruded into a linear shape from the die. One side of the die is provided with a cooling Water tank, the cooling water tank is set on the base, the cooling water tank cools the linear molding material extruded from the die, and the other side of the cooling water tank is provided with a drying device, the drying device is mainly for drying The water left on the linear plastic after the dry linear plastic is cooled by the water tank is provided with a granulator on the other side of the drying device, and a vibrating sieve is provided at the lower end of the granulator, and the vibrating sieve is connected with the The lower end of the pipeline is connected, the vibrating material screen is connected with the finished product warehouse through the pipeline, and the lower end of the finished product warehouse is provided with a blower, the pelletizer cuts the linear plastic into plastic granules and filters them into the pipeline through the vibrating material sieve, and blows the plastic to the pipeline through the blower. The pellets are sent to the finished product warehouse through the pipeline, and the plastic enters the finished product warehouse for further drying and then cooling.

The output shaft of the feeding motor is connected with the transmission box, and the transmission box is connected with the feeding screw and the stirring rod in the feeding hopper.

The twin-screw comprises two parallel first and second screws that rotate in different directions, and one end of the first screw and the second screw is engaged to form a meshing section, and a kneading block is provided on the screw of the meshing section , and the end of the meshing section is the outlet.

The barrel is divided into a feeding section, a melting section and a homogenizing section, and a heating system is arranged inside the barrel.

The upper end of the die mouth of the material barrel is provided with a draft device, and the draft device is connected with a purification filter device.

The outlet of the feed hopper is provided with a cut-off device, which can adjust and cut off the material flow. There is a cooling jacket around the outlet to prevent the high temperature of the barrel from transferring heat to the feed hopper, and avoid the feed hopper The inner plastic becomes sticky when it heats up, causing uneven feeding and obstruction of material flow.

The beneficial effects of the utility model are: simple structure, high assembly precision, convenient operation, large output, fast extrusion speed, good mixing and plasticizing performance, and the resin material to be processed passes through different stages of the barrel to make the mixing more uniform and automatic. high degree.

Description of drawings

Fig. 1 is the structural representation of the utility model.

In the figure, 1-base, 2-main motor, 3-hopper bracket, 4-feeding motor, 5-feeding hopper, 6-transmission box, 7-transmission device, 8-barrel, 9-extrusion die , 10-die opening, 11-cooling water tank, 12-granulator, 13-vibrating material screen, 14-blower, 15-pipeline, 16 finished product warehouse, 17-exhaust device.

Detailed ways

The specific embodiment of the utility model will be further described below in conjunction with accompanying drawing:

As shown in Figure 1, a twin-screw extrusion device for forming plastic pellets includes a base 1, a main motor 2, a feeding motor 4, a feeding hopper 5, a barrel 8, a die opening 10, a cooling water tank 11, a pelletizer Machine 12, material vibrating screen 13, blower 14, finished product warehouse 16, the main motor 2 is arranged on the base 1, the main motor 2 is connected with the transmission device 7, and the side of the base 1 close to the main motor 2 is provided with material Bucket support 3, described hopper support 3 is provided with feeding hopper 5, and feeding hopper 5 side is provided with feeding motor 4, and described feeding hopper 5 is provided with feeding screw rod, and described feeding hopper 5 The discharge port is connected with the barrel 8, the barrel 8 is provided with a twin-screw, the twin-screw is connected with the output shaft of the transmission device 7, the end of the barrel 8 is provided with an extrusion die 9, and the extruder The die head 9 is provided with a die opening 10, and the resin material is extruded into a linear shape from the die opening 10. One side of the die opening 10 is provided with a cooling water tank 11, and the cooling water tank 11 is arranged on the base 1. The cooling water tank 11 cools the linear molding material extruded from the die opening 10, and the other side of the cooling water tank 11 is provided with a drying device. The other side of the drying device is provided with a granulator 12, the lower end of the granulator 12 is provided with a vibrating material screen 13, and the vibrating material sieve 13 is connected with a pipeline 15 arranged at its lower end, The vibrating material sieve 13 is connected with the finished product warehouse 16 through the pipeline 15, and the lower end of the finished product warehouse 16 is provided with a blower 14, and the pelletizer 12 cuts the linear plastic into plastic pellets and filters it to the pipeline 15 through the vibrating material sieve 13. The blower 14 sends the plastic pellets from the pipeline 15 into the finished product warehouse 16, and the plastic enters the finished product warehouse 16 for further drying and then cooling.

The output shaft of the feeding motor 4 is connected to the transmission box 6, and the transmission box 6 is connected to the feeding screw and the stirring rod in the feeding hopper 5.

The twin-screw comprises two first and second screws arranged in parallel and rotating in the same direction. One end of the first screw and the second screw is engaged to form a meshing section, and a kneading block is arranged on the screw of the meshing section. , and the end of the meshing section is the outlet.

The barrel 8 is divided into a feeding section, a melting section, and a homogenizing section, and a heating system is arranged inside the barrel 8 .

The upper ends of the extruding die head 9 and the die opening 10 are provided with a ventilation device 17, and the ventilation device 17 is connected with a purification filter device.

The outlet of the feed hopper 5 is provided with a cut-off device, which can adjust and cut off the material flow. There is a cooling jacket around the outlet to prevent the high temperature of the barrel from transferring heat to the feed hopper and avoid feeding The plastic in the hopper becomes sticky when it heats up, causing uneven feeding and obstruction of material flow.

The twin-screws rotate in the same direction. Because the speed directions of the twin-screws rotating in the same direction are opposite at the meshing position, one screw will pull the material into the meshing gap, while the other screw will push the material out of the gap. As a result, the material will From one screw to another, it advances in an ∞ shape. Since the gap in the meshing area is small, the speed of the thread and the groove at the meshing point are opposite, so the shearing speed is high.

The plastic enters the barrel 8 of the extruder from the feed hopper 5, and under the rotation of the screw, it moves forward due to the friction between the inner wall of the barrel 8 and the surface of the screw. In the feeding section, the main function of the screw is to compact the plastic and provide the power to transport it forward. The material still exists in a solid state, although due to the strong frictional heat, the plastic that is in contact with the inner wall of the barrel 8 is close to the end. Or when the viscous flow temperature is reached, the surface of the solid particles becomes sticky, but the melting has not yet started. This area is called the hysteresis zone, which refers to the viscous fluid state from the end of the solid conveying zone to the beginning of melting. The material entering the homogenization section from the melting section is a viscous fluid that has been completely melted, and the viscous fluid transported forward is in the Under the resistance of the die opening 10 of the die, a part of the return flow is further mixed and plasticized, and part of it is extruded from the die die 10 of the die at a fixed quantity and pressure.

What described in above-mentioned embodiment and description just illustrates the principle of the utility model and the best embodiment, under the premise of not departing from the spirit and scope of the utility model, the utility model also can have various changes and improvements, these changes and improvements All fall within the scope of the utility model claimed.

Claims (6)

1. the double screw extruder that a plastic pellet is shaping, comprise mair motor, feeding motor, feed hopper, barrel, die orifice, bosh, pelleter, shake material screen, air blast, finished bin, base, described mair motor is arranged on base, described mair motor is connected with transmission device, described base is provided with hopper base on mair motor side, described hopper base is provided with feed hopper, feed hopper side is provided with feeding motor, feed screw is provided with in described feed hopper, the discharging opening of described feed hopper is connected with described barrel, twin-screw is provided with in described barrel, described twin-screw is connected with the output shaft of transmission device, described barrel end is provided with material extrusion die head, die head is provided with die orifice, the side of die orifice is provided with bosh, described bosh is arranged on base, the opposite side of described bosh is provided with drying unit, the opposite side of drying unit is provided with pelleter, described pelleter lower end is provided with shake material screen, described shake material screen is connected with the pipeline being arranged on its lower end, described shake material screen is connected with finished bin by pipeline, described finished bin lower end is provided with air blast.

2. the double screw extruder that a kind of plastic pellet according to claim 1 is shaping, is characterized in that: described feeding motor output shaft is connected with transmission case, and described transmission case is connected with the feed screw in feed hopper, puddler.

3. the double screw extruder that a kind of plastic pellet according to claim 1 is shaping, it is characterized in that: described twin-screw comprise two be arranged in parallel and along different directions rotate the first screw rod and the second screw rod, one end of first screw rod and the second screw rod forms engaged section by engagement, the screw rod of described engaged section is provided with kneading block, and the end of engaged section is discharging opening.

4. the double screw extruder that a kind of plastic pellet according to claim 1 is shaping, is characterized in that: described barrel is divided into feeding section, melt zone, homogenizing zone, is provided with heating system in described barrel.

5. the double screw extruder that a kind of plastic pellet according to claim 1 is shaping, is characterized in that: described barrel die orifice upper end is provided with extractor fan, and described extractor fan is connected with filtration equipment for clarifying.

6. the double screw extruder that a kind of plastic pellet according to claim 1 is shaping, is characterized in that: the discharge outlet of described feed hopper is provided with cutting device, around discharging opening, have cooling jacket.