Incongruous double-screw non-return structure

Abstract

The utility model discloses a counter-rotating double-screw non-return structure which comprises a non-return ring, the non-return ring is arranged in a machine barrel, the non-return ring comprises a fixing piece and an installing piece, the installing piece is arranged in the middle of the fixing piece, the installing piece is arranged on rod heads of two screws in a sleeved mode, a liquid guide groove is formed between the fixing piece and the installing piece, and the fixing piece and the installing piece are fixedly connected through the liquid guide groove. A connecting pile is fixedly mounted in the middle of the mounting part, a push-pull plug plate is mounted on the connecting pile in a sliding manner, rod heads of the two screws are also sleeved with the push-pull plug plate, the device is arranged in a double-screw injection molding machine barrel and mounted at the front end of the double screws, and the rod heads of the double screws are all sleeved with the mounting part, the rear supporting plate and the push-pull plug plate. During injection molding, materials flow backwards through the liquid guide groove by pushing the push-pull plug plate, and the push-pull plug plate can seal the liquid guide groove under the action of the push-press spring to prevent backflow.

Description

Technical Field

[0001] The utility model relates to the technical field of injection screws, and particularly relates to a reverse stopping structure for a counter-rotating twin screw. Background Art

[0002] The check valve is equivalent to a one-way valve inside the barrel. It is conductive during plasticization. After the plastic particles are plasticized, they enter the front space of the barrel through the check valve. Then, when the screw is pushed for injection, the check valve isolates the front part and the rear part of the barrel to prevent pressure relief during injection into the mold cavity, thus ensuring the smooth progress of the injection process. For a twin-screw injection molding machine, the barrel space is larger and more complex, and ordinary check rings cannot be directly applied. Content of the Utility Model

[0003] Aiming at the deficiencies existing in the prior art, the purpose of the utility model is to provide a reverse stopping structure for a counter-rotating twin screw, which solves the current pain points in this field.

[0004] The above technical purpose of the utility model is achieved through the following technical solutions:

[0005] A reverse stopping structure for a counter-rotating twin screw includes a check ring. The check ring is arranged in the barrel. The check ring includes a fixing part and a mounting part. The mounting part is arranged in the middle of the fixing part. The mounting part is sleeved on the rod heads of two screws. A liquid guiding groove is arranged between the fixing part and the mounting part. A connecting pile is fixedly installed in the middle of the mounting part. A push-pull plug plate is slidably installed on the connecting pile. The push-pull plug plate is also sleeved on the rod heads of two screws. The outer edge of the push-pull plug plate is an inclined surface, and the side wall of the liquid guiding groove is an inclined surface with the same angle. The push-pull plug plate can fit with the side wall of the liquid guiding groove to close the liquid guiding groove.

[0006] The other end of the connecting pile is fixedly installed with a rear support plate. The rear support plate is also sleeved on the rod heads of two screws. A top push rod is fixedly installed on the rear support plate. The top push rod is slidably installed in the push-pull plug plate. A push spring connected to the top push rod is arranged on the top push rod. The push spring can make the push-pull plug plate closely adhere to the side wall of the liquid guiding groove.

[0007] In summary, the beneficial effect of the utility model compared with the prior art is that the device is arranged in the barrel of a twin-screw injection molding machine and installed at the front end of the twin screw. The mounting part, the rear support plate and the push-pull plug plate are all sleeved on the rod heads of the twin screw. During injection molding, the material pushes the push-pull plug plate and flows backward through the liquid guiding groove. The push-pull plug plate can close the liquid guiding groove under the action of the push spring to prevent backflow. Description of the Drawings

[0008] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features, and advantages of the exemplary embodiments of the present utility model will become readily understandable. In the drawings, several embodiments of the present utility model are shown in an exemplary rather than restrictive manner, wherein:

[0009] Figure 1 It is a schematic structural diagram of a reverse-rotation prevention structure of a counter-rotating twin screw.

[0010] Figure 2 It is Figure 1 The schematic cross-sectional structure diagram in the A-A direction in

[0011] Figure 3 It is Figure 1 The schematic cross-sectional structure diagram in the B-B direction in

[0012] Explanation of reference numerals: 1, barrel; 2, screw head; 3, reverse-rotation prevention ring; 31, fixing part; 32, mounting part; 33, liquid guide groove; 4, rear support plate; 5, connecting pile; 6, push-pull plug plate; 7, push rod; 8, compression spring. Specific embodiments

[0013] The following further details the present utility model with reference to the accompanying drawings.

[0014] A reverse-rotation prevention structure of a counter-rotating twin screw includes a reverse-rotation prevention ring 3. The reverse-rotation prevention ring 3 is arranged in the barrel 1. The reverse-rotation prevention ring 3 includes a fixing part 31 and a mounting part 32. The mounting part 32 is arranged in the middle of the fixing part 31. The mounting part 32 is sleeved on the screw heads 2 of the two screws. A liquid guide groove 33 is arranged between the fixing part 31 and the mounting part 32. A connecting pile 5 is fixedly installed in the middle of the mounting part 32. A push-pull plug plate 6 is slidably installed on the connecting pile 5. The push-pull plug plate 6 is also sleeved on the screw heads 2 of the two screws. The outer edge of the push-pull plug plate 6 is a slope. The side wall of the liquid guide groove 33 is a slope with a through angle. The push-pull plug plate 6 can be attached to the side wall of the liquid guide groove 33 to close the liquid guide groove 33.

[0015] The other end of the connecting pile 5 is fixedly installed with a rear support plate 4. The rear support plate 4 is also sleeved on the screw heads 2 of the two screws. A push rod 7 is fixedly installed on the rear support plate 4. The push rod 7 is slidably installed in the push-pull plug plate 6. A compression spring 8 connected to the push rod 7 is arranged on the push rod 7. The compression spring 8 can make the push-pull plug plate 6 closely attached to the side wall of the liquid guide groove 33.

[0016] The above is only an exemplary embodiment of the present utility model, rather than used to limit the protection scope of the present utility model. The protection scope of the present utility model is determined by the appended claims.

Claims

1. An anti-backflow structure for a co-rotating twin screw, characterized in that: It includes a check valve ring (3), the check valve ring (3) is arranged in the barrel (1), the check valve ring (3) includes a fixing part (31) and a mounting part (32), the mounting part (32) is arranged in the middle of the fixing part (31), the mounting part (32) is sleeved on the rod heads (2) of two screws, a liquid guide groove (33) is arranged between the fixing part (31) and the mounting part (32), a connecting pile (5) is fixedly installed in the middle of the mounting part (32), a push-pull plug plate (6) is slidably installed on the connecting pile (5), the push-pull plug plate (6) is also sleeved on the rod heads (2) of two screws, the outer edge of the push-pull plug plate (6) is an inclined surface, the side wall of the liquid guide groove (33) is an inclined surface with the same angle, and the push-pull plug plate (6) can be attached to the side wall of the liquid guide groove (33) to close the liquid guide groove (33).

2. The reverse-stopping structure of a counter-rotating twin screw according to claim 1, wherein: The other end of the connecting pile (5) is fixedly installed with a rear support plate (4), the rear support plate (4) is also sleeved on the rod heads (2) of two screws, a push rod (7) is fixedly installed on the rear support plate (4), the push rod (7) is slidably installed in the push-pull plug plate (6), a push spring (8) connected to the push rod (7) is arranged on the push rod (7), and the push spring (8) can make the push-pull plug plate (6) closely attached to the side wall of the liquid guide groove (33).

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