CN114536713B

CN114536713B - Extruder devolatilization degassing device and extruder

Info

Publication number: CN114536713B
Application number: CN202210157562.1A
Authority: CN
Inventors: 吴浩; 佟毅; 卢翔; 李义; 瞿金平; 刘颖慰; 郭昱滢
Original assignee: SUZHOU COFCO BIOCHEMICAL CO Ltd; Huazhong University of Science and Technology; Cofco Jilin Bio Chemical Technology Co Ltd
Current assignee: SUZHOU COFCO BIOCHEMICAL CO Ltd; Huazhong University of Science and Technology; Cofco Jilin Bio Chemical Technology Co Ltd
Priority date: 2022-02-21
Filing date: 2022-02-21
Publication date: 2023-03-31
Anticipated expiration: 2042-02-21
Also published as: CN114536713A

Abstract

The invention discloses a devolatilization degassing device of an extruder and the extruder, belonging to the technical field of devolatilization degassing of extruders, wherein the devolatilization degassing device is arranged at a devolatilization degassing port of a machine barrel of the extruder and comprises a power transmission component, a first connecting rod, a second connecting rod, a first push plate, a second push plate and a vacuum seat; the vacuum seat and the machine barrel form a closed cavity, one ends of the first connecting rod and the second connecting rod are respectively connected to the power transmission assembly, and the other ends of the first connecting rod and the second connecting rod respectively penetrate through the vacuum seat and are connected to the first pushing plate and the second pushing plate; the power transmission assembly drives the first connecting rod and the second connecting rod to respectively drive the first pushing plate and the second pushing plate to do vertical reciprocating linear motion along the inner wall of the devolatilization port of the machine barrel, so that materials rushing out from the devolatilization port are pushed and pressed into the machine barrel. The invention can realize high-efficiency devolatilization and degassing of the high polymer material in the processing process in the extruder, can effectively solve the problem of difficult devolatilization and degassing caused by the gushing of the material at the devolatilization and degassing port, and has wide application range to the material.

Description

Extruder devolatilization degassing device and extruder

Technical Field

The invention belongs to the technical field of devolatilization and degassing of extruders, and particularly relates to a devolatilization and degassing device of an extruder and the extruder.

Background

The extruder has the advantages of continuous production, direct extrusion molding, good mixing effect, high production efficiency, low cost and the like, and is the most common equipment in the field of processing of high polymer materials. However, most of the raw materials of the polymer material are powder or granular, so that part of air is often trapped inside the extruder during the process of melting and plasticizing in the extruder; in addition, part of the polymer material can also generate chemical reaction in the processing process in the extruder to generate volatile gas. If the gas cannot be exhausted in time during the processing of the extruder, the performance of the polymer product can be seriously affected.

The devolatilization degassing method commonly used by the existing extruder is to arrange a devolatilization degassing port at the rear half section of a cylinder of the extruder, utilize a vacuum pump to perform devolatilization degassing on the processing process of the high polymer material at the position, and the screw structure at the position needs special design, and has longer screw pitch and more complex structure. However, some polymer materials have high viscosity, so that once the material amount is large and the head pressure is too high, the material is easy to gush out at the devolatilization degassing port, and the devolatilization degassing port is blocked, so that the devolatilization degassing efficiency of the vacuum pump in the process of processing the polymer materials is influenced, and the devolatilization is not thorough.

For some extruders with special screw structures, for example, chinese patent CN104002447 discloses a method and a device for plasticizing and transporting materials by pulsating deformation of the volume of an eccentric rotor, which utilizes the meshing relationship between the eccentric rotor and a stator to plasticize and transport the materials, and if a devolatilization degassing port is directly formed on a machine barrel by using a conventional devolatilization degassing method, the materials are discharged from the devolatilization degassing port under the driving of the eccentric rotor, and the devolatilization degassing of the processing process cannot be realized.

Therefore, in order to overcome the defects in the prior art, a new devolatilization degassing device needs to be developed to meet the devolatilization degassing requirements of the materials with higher viscosity and the extruder with a special structure.

Disclosure of Invention

The invention provides a devolatilization degassing device of an extruder and an extruder aiming at overcoming the defects or the improvement requirements of the prior art, and aims to drive a first connecting rod and a second connecting rod to respectively drive a first pushing plate and a second pushing plate to do reciprocating linear motion up and down through a power transmission component, so that a material emerging from the devolatilization degassing port can be pushed into a machine barrel through the reciprocating motion of the first pushing plate and the second pushing plate, and the technical problem of difficult devolatilization degassing caused by the emerging of the material at the devolatilization degassing port is solved.

To achieve the above object, according to one aspect of the present invention, there is provided an extruder devolatilization degassing apparatus provided at a devolatilization degassing port of a barrel of an extruder, comprising: the vacuum pump comprises a power transmission assembly, a first connecting rod, a second connecting rod, a first pushing plate, a second pushing plate, a vacuum seat and a vacuumizing assembly;

the vacuum seat is arranged at the upper part of the machine barrel and forms a closed cavity with the machine barrel, and the vacuumizing assembly is arranged on the side of the machine barrel and is communicated with the vacuum seat; one end of the first connecting rod is connected to the power transmission assembly, and the other end of the first connecting rod penetrates through the vacuum seat and is connected to the first push plate; one end of the second connecting rod is connected to the power transmission assembly, and the other end of the second connecting rod penetrates through the vacuum seat and is connected to the second pushing plate; the first pushing plate and the second pushing plate are arranged oppositely along the inner wall of the devolatilization air outlet of the machine barrel;

the power transmission assembly is used for driving the first connecting rod and the second connecting rod to respectively drive the first pushing plate and the second pushing plate to do reciprocating linear motion up and down along the inner wall of the devolatilization port of the machine barrel, so that the material rushing out from the devolatilization port is pushed and pressed into the machine barrel.

Further preferably, the stroke of the up-and-down movement of the first pushing plate and the second pushing plate is less than the height of the inner wall of the devolatilization and degassing port, and the bottom dead center of the movement is the inner wall surface of the extruder cylinder.

Further preferably, the up-and-down movement speed of the first pushing plate and the second pushing plate can be freely adjusted according to the rotating speed of the extruder, the material amount and the material state.

Further preferably, the vacuum seat is of a hollow structure, and the space between the vacuum seat and the extruder barrel and the connecting rod is sealed by a second sealing ring, so that a closed negative pressure environment is formed at the devolatilization degassing port.

Further preferably, the vacuum seat is used for connecting a vacuum pump and a devolatilization degassing port of the extruder through a connecting pipe, and the first connecting rod and the second connecting rod are sealed with the inner hole of the vacuum seat through the first sealing ring and are in sliding fit with the inner hole of the guide sleeve.

Preferably, the first pushing plate comprises a first connecting part and a first arc part; the first connecting part is connected to the first connecting rod; one side of the first arc part is provided with an arc-shaped protrusion, and the diameter of the arc-shaped protrusion is the same as that of the inner wall hole of the machine barrel, so that the first arc part is tangent to the inner wall hole of the machine barrel at the lower stopping point and is tightly attached to a first screw rod located in the machine barrel.

Preferably, the first connecting portion is provided with a protruding structure, and the protruding structure is used for abutting against the upper wall surface of the devolatilization and degassing port when the first arc portion is located at the bottom dead center so as to prevent the first pushing plate from falling off.

Preferably, the second pushing plate comprises a second connecting part and a second arc part; the second connecting part is connected to the second connecting rod; one side of the second arc part is provided with an arc-shaped bulge, and the diameter of the arc-shaped bulge is the same as that of the inner wall hole of the machine barrel, so that the second arc part is tangent to the inner wall hole of the machine barrel at the lower stopping point and is tightly attached to a second screw rod positioned in the machine barrel.

Preferably, the second connecting portion is provided with a protruding structure, and the protruding structure is used for abutting against the upper wall surface of the devolatilization and degassing port at the position of the lower dead center so as to prevent the second pushing plate from falling off.

Preferably, the power transmission assembly comprises a first bearing seat, a first connecting rod, a crankshaft, a second connecting rod, a second bearing seat, a coupling, a second speed reducer and a second motor;

a first bearing seat and a second bearing seat are respectively arranged at two ends of the crankshaft, and the first connecting rod and the second connecting rod are assembled on the crankshaft and synchronously rotate with the crankshaft; the first connecting rod is connected to the first connecting rod, and the second connecting rod is connected to the second connecting rod; one end of the crankshaft is sequentially connected with the coupler and the second speed reducer, and the second speed reducer is connected with an output shaft of the second motor.

Preferably, the crankshaft is provided with two eccentric shaft sections having eccentricity with the axis thereof, and the first connecting rod and the second connecting rod are respectively arranged on the two eccentric shaft sections.

Preferably, the movement stroke of the first pushing plate and the second pushing plate is twice of the eccentric amount at the eccentric shaft section on the crankshaft.

Preferably, the power transmission assembly comprises a first cylinder and a second cylinder; the output end of the first air cylinder is connected to the first connecting rod, and the output end of the second air cylinder is connected to the second connecting rod; two upper and lower intake ducts have been seted up respectively to first cylinder and second cylinder, the intake duct is used for connecting outside air supply, through outside air supply in order to promote the piston rod up-and-down reciprocating motion of first cylinder and second cylinder.

According to another aspect of the invention, an extruder is provided, which comprises the extruder devolatilization degassing device as described above, and further comprises a first motor, a first speed reducer and a hopper, wherein an output shaft of the first motor is connected to the first speed reducer, and the hopper is arranged above the machine barrel; the first motor drives a first screw and a second screw in the cylinder to rotate in an opposite outward turning way through the first speed reducer so as to melt, plasticize and mix the material falling from the hopper, and the material is conveyed forwards; the extruder devolatilization degassing device is used for pushing materials gushing out from a devolatilization degassing port of the machine barrel into the machine barrel so as to enable the devolatilization degassing port to be kept smooth.

In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:

1. according to the devolatilization degassing device of the extruder, the power transmission assembly drives the first connecting rod and the second connecting rod to respectively drive the first pushing plate and the second pushing plate to do vertical reciprocating linear motion, materials gushing out from the devolatilization degassing port can be pushed and enter the machine barrel through the reciprocating motion of the first pushing plate and the second pushing plate, so that the devolatilization degassing port is kept smooth, meanwhile, the devolatilization degassing area of the materials can be increased through the extrusion of the first pushing plate and the second pushing plate, and the devolatilization degassing efficiency is improved.

2. According to the devolatilization degassing device of the extruder, the lowest ends of the first pushing plate and the second pushing plate are designed to be arc-shaped structures, and the radius of the arc is the same as that of the inner hole of the machine barrel, so that the arc-shaped structures can be tangent to the inner hole of the machine barrel at the lower stopping point and can be tightly attached to the first screw and the second screw, and materials are prevented from flowing out of the devolatilization degassing port to the maximum extent.

3. According to the devolatilizing and degassing device of the extruder, the upper parts of the first pushing plate and the second pushing plate are designed to be protruding structures, so that the first pushing plate and the second pushing plate, the first connecting rod and the second connecting rod are prevented from falling into a machine barrel to damage equipment.

4. The devolatilization and degassing device of the extruder provided by the invention has the advantages of simple structure, stable operation, high reliability, small volume and low cost.

Drawings

FIG. 1 is a schematic view of a devolatilization degassing apparatus installed in an extruder in accordance with an embodiment of the present invention;

FIG. 2 is a schematic view showing the construction of a devolatilizer apparatus in an embodiment of the present invention;

FIG. 3 is a schematic three-dimensional view of a pusher plate according to an embodiment of the present invention;

FIG. 4 is a schematic structural view of a crankshaft in one embodiment of the present invention;

FIG. 5 is a schematic view showing the structure of a devolatilizer apparatus in an embodiment of the present invention.

The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein: 1-a first electric machine; 2-a first reducer; 3-machine barrel; 4-a hopper; 5-devolatilizing and degassing device of extruder; 6-a vacuum pump; 7-connecting pipe; 8-vacuum seat; 9-a first sealing ring; 10-a second sealing ring; 11-a first screw; 12-a second screw; 13-a first pusher plate; 14-a second pusher plate; 15-a first connecting rod; 16-a second connecting rod; 17-a guide sleeve; 18-a first bearing seat; 19-a first link; 20-a crankshaft; 21-a second link; 22-a second bearing block; 23-a coupler; 24-a second reducer; 25-a second motor; 26-a first cylinder; 27-second cylinder.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The invention provides a devolatilization degassing device of an extruder, which is used for a high polymer material continuous processing or synthesizing system taking the extruder as processing equipment.

Example 1

As shown in fig. 1 and fig. 2, the devolatilization and degassing device of the extruder according to the present embodiment is located at a devolatilization and degassing port of the extruder, and needs to be used in combination with a host machine of the extruder to form a whole set of system, and the system is composed of a first motor 1, a first speed reducer 2, an extruder extrusion system, and an extruder devolatilization and degassing device 5. The extruder extrusion system is composed of a machine barrel 3, a first screw 13, a second screw 14, a hopper 4 and the like. The devolatilization and degassing device 5 of the extruder comprises a vacuum pump 6, a connecting pipe 7, a vacuum seat 8, a first sealing ring 9, a second sealing ring 10, a first push plate 13, a second push plate 14, a first connecting rod 15, a second connecting rod 16, a guide sleeve 17, a first bearing seat 18, a first connecting rod 19, a crankshaft 20, a second connecting rod 21, a second bearing seat 22, a coupling 23, a second speed reducer 24, a second motor 25 and the like.

A feeding port and a devolatilization and degassing port are arranged on the extruder barrel 3, and the hopper 4 is arranged at the feeding port; the vacuum pump 6 is connected with the extruder barrel 3 at the devolatilization degassing port through the vacuum seat 8 and the connecting pipe 7, and a power transmission component of a devolatilization degassing device is arranged above the vacuum pump. The first pushing plate 13 and the second pushing plate 14 are respectively connected through the first connecting rod 15 and the second connecting rod 16 and penetrate through the vacuum seat 8 to be installed at two side walls in a devolatilizing port of the extruder barrel 3; the bottom of the vacuum seat 8 and the barrel 3 are sealed by the second sealing ring 10; the first connecting rod 15 and the second connecting rod 16 are sealed with the vacuum seat 8 by the first sealing ring 9; the first connecting rod 15 and the second connecting rod 16 respectively penetrate through the shaft hole inside the guide sleeve 17 and are connected with two eccentric shaft sections on the crankshaft 20 through the first connecting rod 19 and the second connecting rod 21, two ends of the crankshaft 20 are fixedly installed in the first bearing seat 18 and the second bearing seat 22 through bearings and are connected with an output shaft of the second speed reducer 24 through the coupler 23, and an input shaft of the second speed reducer 24 is connected with an output shaft of the second motor 25.

Specifically, the first pushing plate 13 and the second pushing plate 14 are symmetrically arranged on the inner wall of the devolatilization and degassing port of the extruder, and are closely attached to the inner walls on two sides of the devolatilization and degassing port to perform vertical reciprocating motion.

To be further explained, the up-and-down movement stroke of the first pushing plate 13 and the second pushing plate 14 is less than the height of the inner wall of the devolatilization and degassing port, and the bottom dead center of the movement is at the inner wall surface of the cylinder 3 of the extruder.

In a further description, the up-and-down movement speed of the first pushing plate 13 and the second pushing plate 14 can be adjusted by adjusting the rotation speed of the second motor 25 according to the rotation speed of the extruder, the material amount and the material state.

Specifically, as shown in fig. 3, the first pushing plate 13 and the second pushing plate 14 have the same structure and are thin plate-like structures, so that the volume inside the devolatilization port can be maintained to the maximum extent, and the thin plate-like structures can be tightly attached to the devolatilization port side walls; the lowest ends of the first pushing plate 13 and the second pushing plate 14 are arc-shaped structures, and the arc radius is the same as the radius of the inner hole of the machine barrel 3, so that the arc-shaped structures can be tangent to the inner hole of the machine barrel 3 at the lower stopping point and tightly attached to the first screw 11 and the second screw 12, and the materials are prevented from being gushed out from a devolatilization degassing port to the maximum extent; the upper parts of the first pushing plate 13 and the second pushing plate 14 are of a protruding structure, so that the first pushing plate 13 and the second pushing plate 14, the first connecting rod 15 and the second connecting rod 16 are prevented from falling off and falling into the cylinder 3 to damage equipment.

Specifically, as shown in fig. 4, two eccentric shaft sections having an eccentric amount e with respect to the axis of the crankshaft 20 are provided on the crankshaft 20, the two eccentric shaft sections are connected to the first pushing plate 13 and the second pushing plate 14 through the first connecting rod 19, the second connecting rod 21, the first connecting rod 15, and the second connecting rod 16, respectively, the crankshaft 20 can convert the rotary motion of the crankshaft into the vertical reciprocating linear motion of the first pushing plate 13 and the second pushing plate 14 through the eccentric shaft sections, and the vertical reciprocating linear motion distance of the first pushing plate 13 and the second pushing plate 14 is 2e.

The working process of the embodiment is as follows: the first motor 1 drives the first screw rod 11 and the second screw rod 12 in the machine barrel 3 to rotate in an outward turning way through the first speed reducer 2, the high polymer material is fed into the machine barrel 3 through the hopper 4, and under the rotating action of the first screw rod 11 and the second screw rod 12, the material is continuously melted, plasticized and mixed and is conveyed forwards. When the materials reach the devolatilization degassing port, a vacuum pump is started to devolatilize and degas the materials. Because the higher viscosity of macromolecular material can make the material great at the pressure of extrusion opening department to make the material in taking off and wave off gas port department and produce the backpressure, if the screw rod can not in time carry the material forward, then will have the material to gush out taking off gas port department, the jam takes off and waves the degasification passageway, and then seriously influences and takes off and wave degasification efficiency, leads to the gas in the material can not be removed to the greatest extent. At this moment, the second motor 25 is started, the second motor 25 drives the crankshaft 20 to rotate through the second speed reducer 24, the crankshaft 20 drives the first pushing plate 13 and the second pushing plate 14 to do vertical reciprocating linear motion through the first connecting rod 19, the second connecting rod 21, the first connecting rod 15 and the second connecting rod 16 respectively, through the reciprocating motion of the first pushing plate 13 and the second pushing plate 14, materials gushing out from a devolatilization degassing port can be pushed and pressed into the machine barrel 3, so that the devolatilization degassing port is kept smooth, meanwhile, the devolatilization degassing area of the materials can be increased through the extrusion of the first pushing plate 13 and the second pushing plate 14, and the devolatilization degassing efficiency is improved.

Example 2

As shown in fig. 5, the present embodiment proposes a pneumatic devolatilization and degassing device, which uses a cylinder as a power source to drive a pushing plate to perform a reciprocating linear motion, and compared with the structure in which a motor drives the pushing plate to perform a reciprocating linear motion through a crankshaft in embodiment 1, the structure of the device in this embodiment is simpler and more compact. The devolatilization degassing device of the embodiment comprises a vacuum pump 6, a connecting pipe 7, a vacuum seat 8, a first sealing ring 9, a second sealing ring 10, a first pushing plate 13, a second pushing plate 14, a first connecting rod 15, a second connecting rod 16, a first cylinder 26, a second cylinder 27 and the like. The piston rods of the first cylinder 26 and the second cylinder 27 are connected to the first pushing plate 13 and the second pushing plate 14 through the first connecting rod 15 and the second connecting rod 16, respectively.

Specifically, two upper and lower air inlets are respectively formed in the first air cylinder 26 and the second air cylinder 27, and are used for connecting an external air source and pushing the piston rod to reciprocate up and down through the external air source.

More specifically, the piston rod movement stroke of the first cylinder 26 and the second cylinder 27 is the up-and-down reciprocating distance of the first pushing plate 13 and the second pushing plate 14.

The working process of the embodiment is as follows: a first motor 1 drives a first screw rod 11 and a second screw rod 12 in a machine barrel 3 to rotate in an opposite-direction outward turning mode through a first speed reducer 2, a high polymer material matrix is fed into the machine barrel 3 through a hopper 4, and under the rotating action of the first screw rod 11 and the second screw rod 12, the material is continuously melted, plasticized and mixed and conveyed forwards. When the materials reach the devolatilization degassing port, the vacuum pump is started to devolatilize and degas the materials, and simultaneously, the external air source is started to enable the first air cylinder 26 and the second air cylinder 27 to start to act, and piston rods of the first air cylinder 26 and the second air cylinder 27 drive the first pushing plate 13 and the second pushing plate 14 to reciprocate up and down through the first connecting rod 15 and the second connecting rod 16 respectively. Through the reciprocating pushing and pressing movement of the first pushing and pressing plate 13 and the second pushing and pressing plate 14, the materials can be prevented from overflowing at the devolatilization degassing port, and the efficient devolatilization degassing of the materials can be further ensured.

It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. The utility model provides an extruder devolatilizes gas removal equipment, its characterized in that, the device sets up in the devolatilization gas outlet department of extruder barrel (3), includes: the device comprises a power transmission assembly, a first connecting rod (15), a second connecting rod (16), a first pushing plate (13), a second pushing plate (14), a vacuum seat (8) and a vacuum pumping assembly;

the vacuum seat (8) is arranged at the upper part of the machine barrel (3) and forms a closed cavity with the machine barrel, and the vacuumizing assembly is arranged at the side of the machine barrel (3) and is communicated with the vacuum seat (8); one end of the first connecting rod (15) is connected to the power transmission assembly, and the other end of the first connecting rod penetrates through the vacuum seat (8) and is connected to the first pushing plate (13); one end of the second connecting rod (16) is connected to the power transmission assembly, and the other end of the second connecting rod passes through the vacuum seat (8) and is connected to the second pushing plate (14); the first pushing plate (13) and the second pushing plate (14) are arranged along the machine barrel (3) and closely attached to the inner wall of the devolatilization and degassing port oppositely;

the power transmission assembly is used for driving the first connecting rod (15) and the second connecting rod (16) to respectively drive the first pushing plate (13) and the second pushing plate (14) to do reciprocating linear motion up and down along the inner wall of the devolatilization and degassing port of the machine barrel (3), so that the material gushed from the devolatilization and degassing port is pushed into the machine barrel (3);

the first pushing plate (13) comprises a first connecting part and a first arc part; the first connection is connected to the first connecting rod (15); one surface of the first arc part is provided with an arc-shaped bulge, and the diameter of the arc-shaped bulge is the same as that of the inner wall hole of the machine barrel (3), so that the first arc part is tangent to the inner wall hole of the machine barrel at the lower stop point and is tightly attached to a first screw (11) positioned in the machine barrel; the first connecting part is provided with a convex structure, and the convex structure is used for abutting against the upper wall surface of the devolatilization and degassing port when the first arc part is positioned at the lower dead point so as to prevent the first pushing plate (13) from falling off;

the second pushing plate (14) comprises a second connecting part and a second arc part; the second connecting portion is connected to the second connecting rod (16); one surface of the second arc part is provided with an arc-shaped bulge, and the diameter of the arc-shaped bulge is the same as that of the inner wall hole of the machine barrel (3), so that the second arc part is tangent to the inner wall hole of the machine barrel at the lower stop point and is tightly attached to a second screw (12) positioned in the machine barrel; the second connecting portion are provided with protruding structures, and the protruding structures are used for acting as the second arc portion is located the lower dead center and leans on in taking off and volatilizing the gas vent upper wall face so as to prevent that the second push-press plate (14) drops.

2. The devolatilization and degassing device of an extruder as claimed in claim 1, wherein said power transmission assembly comprises a first bearing seat (18), a first connecting rod (19), a crankshaft (20), a second connecting rod (21), a second bearing seat (22), a coupling (23), a second decelerator (24) and a second motor (25);

a first bearing seat (18) and a second bearing seat (22) are respectively arranged at two ends of the crankshaft (20), and the first connecting rod (19) and the second connecting rod (21) are assembled on the crankshaft (20) and rotate synchronously with the crankshaft; the first connecting rod (19) is connected to the first connecting rod (15), and the second connecting rod (21) is connected to the second connecting rod (16); one end of the crankshaft (20) is sequentially connected with the coupler (23) and the second speed reducer (24), and the second speed reducer (24) is connected with an output shaft of the second motor (25).

3. The devolatilization and degassing device of an extruder as claimed in claim 2, wherein said crankshaft (20) is provided with two eccentric shaft sections having an eccentric amount with respect to the axis thereof, and said first connecting rod (19) and said second connecting rod (21) are respectively provided with two eccentric shaft sections.

4. The devolatilization and degassing device of an extruder as claimed in claim 3, wherein the stroke of the movement of said first pushing plate (13) and said second pushing plate (14) is twice the amount of eccentricity at the eccentric shaft section of said crankshaft.

5. The devolatilization and degassing apparatus as claimed in claim 1 in which said power transmission assembly comprises a first cylinder (26) and a second cylinder (27); the output end of the first air cylinder (26) is connected to the first connecting rod (15), and the output end of the second air cylinder (27) is connected to the second connecting rod (16); two upper and lower intake ducts have been seted up respectively to first cylinder (26) and second cylinder (27), the intake duct is used for connecting external air supply, through external air supply in order to promote the piston rod up-and-down reciprocating motion of first cylinder (26) and second cylinder (27).

6. An extruder, characterized by comprising the extruder devolatilization degassing device (5) as set forth in any one of claims 1 to 5, further comprising a first motor (1), a first decelerator (2), and a hopper (4), wherein an output shaft of the first motor (1) is connected to the first decelerator (2), and the hopper (4) is disposed above the barrel (3); the first motor (1) drives a first screw (11) and a second screw (12) in a machine barrel (3) to rotate in an outward turning mode in different directions through the first speed reducer (2) so as to enable materials falling from the hopper (4) to be melted, plasticized and mixed, and the materials are conveyed forwards; the extruder devolatilization degassing device (5) is used for pushing materials which gush out from a devolatilization degassing opening of the machine barrel (3) into the machine barrel (3) so as to enable the devolatilization degassing opening to keep smooth.