Double non-return ring structure of extruder

Abstract

The utility model relates to the technical field of plastic extruders, and discloses a double non-return ring structure of an extruder, which comprises a material mixing pipe, a screw rod is arranged in the material mixing pipe, and a first thread part, a second thread part, a first notch part, a third thread part, a second notch part and a fourth thread part are sequentially arranged on the screw rod. A first groove and a second groove are formed in the inner wall of the mixing pipe, a first lantern ring and a second lantern ring are arranged in the first groove and the second groove, a plurality of elastic pieces are arranged in the first groove and the second groove, the first lantern ring is provided with a non-return thread a, the second lantern ring is provided with a non-return thread b, and the elastic pieces are arranged in the first lantern ring and the second lantern ring. A plurality of air holes are formed in the inner walls of the first groove and the second groove; the mixing pipe has the advantages that the non-return thread a in the mixing pipe can move forwards to relieve the pressure in the feeding direction of the mixing pipe, the non-return thread b can move backwards to relieve the pressure in the discharging direction of the mixing pipe, the pressure in the mixing pipe can be automatically adjusted, and the safety is high.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic extruders, in particular to a double check valve ring structure of an extruder. Background Art

[0002] The mixing tube of a plastic extruder, also called an extrusion tube, can stir solid plastic mixtures into plastic fluid and transport them to a shaping machine. When the materials are melted and mixed in the extrusion tube, in order to improve the fusion degree and adjust the consistency, additives are usually injected in each link. To avoid the influence of material backflow on the mixing quality, a check valve ring is usually arranged in the extrusion tube to prevent material backflow.

[0003] However, the existing check valve structure of the extruder is relatively simple. For example, the check valve structure of the extruder disclosed in Chinese Patent CN217803199U. Such a check valve structure is not impact-resistant and is prone to component deformation and damage when the pressure difference between the front and rear parts of the check valve component is too large. In view of this, the inventor has made a new invention. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a double check valve ring structure of an extruder for the deficiencies of the prior art, which has the advantage of automatically relieving the internal pressure.

[0005] To achieve the above purpose, a double check valve ring structure of an extruder of the utility model includes a mixing tube. A screw is arranged in the mixing tube. A first thread part, a second thread part, a first notch part, a third thread part, a second notch part and a fourth thread part are sequentially arranged on the screw. Mirror-symmetrical first and second grooves are arranged on the inner wall of the mixing tube. A first collar is arranged on the first groove, and a second collar is arranged on the second groove. A number of elastic parts are arranged in the first and second grooves. The first collar is provided with a check valve thread a corresponding to the position of the first notch part, and the second collar is provided with a check valve thread b corresponding to the position of the second notch part. A number of air holes are arranged on the inner walls of the first and second grooves; A cutting collar is arranged in the mixing tube. The cutting collar is provided with a fixing thread matching with the second thread part, and a heater is arranged on the back of the cutting collar.

[0006] Further, the mixing tube is provided with a first feed inlet, and the first thread part is arranged below the first feed inlet.

[0007] Preferably, a first feeder is arranged on the first feed inlet.

[0008] Further, the mixing tube is provided with a second feed inlet, and the fourth thread part is arranged below the second feed inlet.

[0009] Preferably, a second feeder is arranged on the second feed inlet.

[0010] Further, the elastic member is an electromagnetic elastic device.

[0011] Further, a positioning hole is arranged inside the screw rod, and three positioning holes are arranged at equal intervals.

[0012] Beneficial effects: Compared with the prior art, the double check valve ring structure of an extruder of the present utility model includes a mixing pipe, a screw rod is arranged inside the mixing pipe, a first thread part, a second thread part, a first notch part, a third thread part, a second notch part and a fourth thread part are sequentially arranged on the screw rod, a first groove and a second groove are arranged on the inner wall of the mixing pipe, a first collar and a second collar are arranged in the first concave and second grooves, a plurality of elastic members are arranged in the first groove and the second groove, the first collar is provided with a check thread a, the second collar is provided with a check thread b, and a plurality of air holes are arranged on the inner walls of the first groove and the second groove; the present utility model has the following advantages: the check thread a in the mixing pipe of the present utility model can move forward, which can slow down the pressure in the feeding direction of the mixing pipe, the check thread b can move backward, which can slow down the pressure in the discharging direction of the mixing pipe, and can automatically adjust the pressure in the mixing pipe, with high safety. Description of the Drawings

[0013] Figure 1 It is a schematic connection diagram of the mixing pipe and the screw rod of the present utility model.

[0014] Figure 2 It is a schematic diagram of the thread structure and position of the screw rod of the present utility model.

[0015] Figure 3 It is a schematic cross-sectional view of the mixing pipe of the present utility model.

[0016] Figure 4 It is a schematic diagram of the structures of the first collar and the second collar of the present utility model.

[0017] The reference numerals include:

[0018] Mixing pipe - 1, First groove - 11, Second groove - 12, Elastic member - 13, Air hole - 14, First feeding port - 15, Second feeding port - 16, Screw rod - 2, First thread part - 21, Second thread part - 22, First notch part - 23, Third thread part - 24, Second notch part - 25, Fourth thread part - 26, Positioning hole - 27, First collar - 3, Check thread a - 31, Second collar - 4, Check thread b - 41, Cutting collar - 5, Fixed thread - 51, Heater - 52, First feeder - 6, Second feeder - 7. Detailed Description of the Invention

[0019] The following Figures 1 to 4 will describe the present utility model in detail with reference to the attached

[0020] A double check valve ring structure of an extruder of the utility model includes a mixing pipe 1. A screw 2 is arranged in the mixing pipe 1. The screw 2 is successively provided with a first thread part 21, a second thread part 22, a first notch part 23, a third thread part 24, a second notch part 25 and a fourth thread part 26. After materials such as plastic particles are put into the mixing pipe 1, the materials are pushed by the first thread part 21 to the second thread part 22, and then pushed by the second thread part 22 to the first notch part 23 to accumulate. After the materials in the first notch part 23 accumulate to a certain amount, they will gradually flow to the third thread part 24. The third thread part 24 pushes the materials to the second notch part 25 to accumulate. After the materials accumulate to a certain amount in the second notch part 25, they will gradually flow to the fourth thread part 26. The fourth thread part 26 extrudes the materials out of the mixing pipe 1. The inner wall of the mixing pipe 1 is provided with a first groove 11 and a second groove 12 which are mirror-symmetrical. A first collar 3 is arranged on the first groove 11, and a second collar 4 is arranged on the second groove 12. A number of elastic members 13 are arranged in the first groove 11 and the second groove 12. The first collar 3 is provided with a check thread a31 corresponding to the position of the first notch part 23, and the second collar 4 is provided with a check thread b41 corresponding to the position of the second notch part 25. A number of air holes 14 are arranged on the inner walls of the first groove 11 and the second groove 12. Specifically, the elastic members 13 enable the first collar 3 to stretch and move in the first groove 11, and the second collar 4 to stretch and move in the second groove 12. One end of the elastic members 13 is fixedly connected to the first collar 3 and the second collar 4, and the other end of the elastic members 13 is fixedly connected to the bottoms of the first groove 11 and the second groove 12. Therefore, the first collar 3 and the second collar 4 are restricted from rotating. The elastic members 13 drive the first collar 3 to protrude towards the feeding end of the mixing pipe 1, and the elastic members 13 drive the second collar 4 to protrude towards the discharging end of the mixing pipe 1. The check thread a31 can prevent the materials accumulated in the first notch part 23 from flowing back to the second thread part 22. When more materials in the second thread part 22 are pushed towards the first notch part 23, the generated pressure will push the check thread a31, causing the first collar 3 to retract, providing a stacking space for the materials pushed by the second thread part 22, and at the same time pushing the materials accumulated in the first notch part 23. This structure can slow down the pressure in the feeding direction of the mixing pipe 1; the check thread b41 can prevent the materials from flowing back from the fourth thread part 26 to the second notch part 25. When liquid additives are put into the fourth thread part 26 to be mixed with the materials, the pressure generated by the increase in the volume of the materials will push the check thread b41, causing the second collar 4 to retract. This structure can slow down the pressure in the discharging direction of the mixing pipe 1; when the first collar 3 and the second collar 4 are moving, the air pressure in the first groove 11 and the second groove 12 can be discharged through the air holes 14, and the structural stability is high. When the materials pushed by the second thread part 22 and the fourth thread part 26 decrease, the first collar 3 and the second collar 4 will continue to protrude and reset.

[0021] A cutting material sleeve ring 5 is arranged inside the mixing tube 1. The cutting material sleeve ring 5 is provided with a fixed thread 51 that cooperates with the second thread part 22, and a heater 52 is arranged on the back of the cutting material sleeve ring 5. The cutting material sleeve ring 5 is fixed inside the mixing tube 1. When the solid material is pushed from the first thread part 21 to the second thread part 22, the fixed thread 51 is heated by the heater 52. The fixed thread 51 and the second thread part 22 cooperate to gradually melt and knead and stir the solid material, so that the fixed material is mixed and stirred into a fluid state. The cutting material sleeve ring 5 has a certain length, can knead the material over a long distance, increase the degree of fusion of the material, and the mixing quality of the material is high.

[0022] The mixing tube 1 is provided with a first feed inlet 15, and the first thread part 21 is arranged below the first feed inlet 15. There is at least one first feed inlet 15. Solid materials such as plastic particles enter the mixing tube 1 from the first feed inlet 15, and the first thread part 21 pushes the solid physics towards the second thread part 22. Multiple first feed inlets 15 can also be provided to facilitate the separate input of solid materials of different colors.

[0023] A first feeder 6 is arranged on the first feed inlet 15. The first feeder 6 can adopt an existing stirring feeder on the market. The solid physics is first put into the first feeder 6, and after being dispersed by the first feeder 6, it is then put into the first feed inlet 15 to prevent the solid physics from blocking the first feed inlet 15.

[0024] The mixing tube 1 is provided with a second feed inlet 16, and the fourth thread part 26 is arranged below the second feed inlet 16. The position of the second feed inlet 16 is close to the second notch part 25. When the material enters the fourth thread part 26, the state of the material has been mixed and stirred into a fluid state. The second feed inlet 16 can facilitate the input of liquid additives or other liquid materials.

[0025] A second feeder 7 is arranged on the second feed inlet 16. The second feeder 7 can adopt an existing stirring feeder with a heating function on the market. The liquid material is stirred and heated in the second feeder 7 and then put into the second feed inlet 16 to facilitate mixing with the material.

[0026] The elastic member 13 is an electromagnetic elastic device. The rotation speed of the screw 2 is adjustable, and the elasticity of the electromagnetic elastic device is also adjustable. The staff can adjust the elasticity of the elastic member 13 according to the rotation speed of the screw 2 to avoid the excessive elasticity of the elastic member 13 affecting the mixing quality of the material.

[0027] Three positioning holes 27 are equidistantly arranged inside the screw 2. One end of the screw 2 is connected to a power motor, and the power motor can position the three positioning holes 27 to accurately rotate the screw 2 and prevent the screw 2 from slipping.

[0028] The above content is only a preferred embodiment of the present utility model. For those of ordinary skill in the art, based on the idea of the present invention, there will be changes in the specific implementation manners and application scopes. The content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A double check ring structure of an extruder, comprising a mixing tube (1), characterized in that: The mixing tube (1) is provided with a screw (2), and the screw (2) is provided with a first threaded portion (21), a second threaded portion (22), a first notch portion (23), a third threaded portion (24), a second notch portion (25) and a fourth threaded portion (26) in sequence. The inner wall of the mixing tube (1) is provided with a first groove (11) and a second groove (12) which are mirror-symmetrical. The first groove (11) is provided with a first sleeve ring (3), and the second groove (12) is provided with a second sleeve ring (4). A plurality of elastic members (13) are provided in the first groove (11) and the second groove (12). The first sleeve ring (3) is provided with a non-return thread a (31) at a position corresponding to the first notch portion (23), and the second sleeve ring (4) is provided with a non-return thread b (41) at a position corresponding to the second notch portion (25). The inner walls of the first groove (11) and the second groove (12) are provided with a plurality of air holes (14). A cutting sleeve (5) is arranged in the mixing tube (1), the cutting sleeve (5) is provided with a fixing thread (51) matched with the second threaded portion (22), and a heater (52) is arranged on the back of the cutting sleeve (5).

2. The double check ring structure of an extruder according to claim 1, characterized in that: The mixing tube (1) is provided with a first feed port (15), and the first threaded portion (21) is arranged below the first feed port (15).

3. The double check ring structure of an extruder according to claim 2, characterized in that: The first feed port (15) is provided with a first feeder (6).

4. The double check ring structure of an extruder according to claim 1, characterized in that: The mixing tube (1) is provided with a second feed port (16), and the fourth threaded portion (26) is arranged below the second feed port (16).

5. The double check ring structure of an extruder according to claim 4, characterized in that: The second feed port (16) is provided with a second feeder (7).

6. The double check ring structure of an extruder according to claim 1, characterized in that: The elastic member (13) is an electromagnetic elastic device.

7. A double check ring structure for an extruder according to any one of claims 1 to 6, characterized in that: The screw rod (2) is provided with positioning holes (27) inside, and three positioning holes (27) are arranged at equal distances.

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