Screw rod of countercurrent prevention structure

Abstract

The utility model relates to the technical field of injection molding screws, and discloses a screw with an anti-backflow structure, which comprises an injection molding pipe and an extrusion rod arranged on the inner wall of the injection molding pipe and used for extruding injection molding materials, and further comprises a feeding pipe fixedly connected to the outer wall of the injection molding pipe, the guiding device is used for guiding molten injection molding materials into the injection molding pipe; and the extrusion screw is arranged on the outer wall of the extrusion rod, is spirally arranged and extrudes the injection molding material in the injection molding pipe to move during rotation. The sealing screw and the sealing push block are arranged and matched with the extrusion screw, so that the interior of an injection molding pipe can be effectively sealed, a molten injection molding material is prevented from flowing reversely in the extrusion process, the extrusion effect is remarkably improved, the injection molding material can be smoothly pushed forwards, and the problem of non-uniform injection molding or blockage caused by reverse flow is solved.

Description

Technical Field

[0001] This utility model relates to the field of injection molding screw technology, specifically a screw with an anti-backflow structure. Background Technology

[0002] In injection molding, the screw is one of the key components of the injection molding machine. Its main function is to push the molten injection material forward through the injection tube and shape it. However, traditional screw designs have some problems and shortcomings, especially in preventing backflow of injection material. These problems directly affect the quality and efficiency of injection molding.

[0003] During injection molding, molten injection material is prone to backflow when the screw stops rotating or the pressure changes suddenly. Backflow not only causes material to flow back into the injection tube, but also leads to uneven molding and may even cause blockages inside the injection molding machine, affecting production efficiency. Simultaneously, pressure changes within the injection tube are unavoidable during injection molding. When the pressure is too high, the molten injection material may flow back through the gap between the screw and the injection tube; conversely, when the pressure is too low, the propulsion of the injection material is affected. Traditional screw designs lack effective pressure balancing mechanisms and struggle to address this pressure variation problem. Therefore, a screw with an anti-backflow structure is proposed to solve the aforementioned problems. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a screw with a backflow prevention structure to address the shortcomings of the prior art.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a screw with an anti-backflow structure, comprising an injection tube and an extrusion rod, wherein the extrusion rod is disposed on the inner wall of the injection tube for extruding injection molding material, and further comprising:

[0006] The feed pipe is fixedly connected to the outer wall of the injection tube, and the connection is interconnected, for introducing molten injection material into the injection tube;

[0007] An extrusion auger is disposed on the outer wall of the extrusion rod and is spirally arranged. When it rotates, it squeezes the injection material inside the injection tube to move.

[0008] Preferably, the outer wall of the extrusion auger is fitted to the inner wall of the injection molding tube, and the outer wall of the extrusion auger is provided with an installation groove, and a sealing auger is installed in the installation groove. The inner wall of the sealing auger is fitted to the inner wall of the injection molding tube to seal the airtightness between the injection molding tube and the extrusion auger.

[0009] Preferably, the outer wall of the extrusion rod is provided with a sealing ring, and the sealing ring is fixedly connected to the inner wall of the injection tube;

[0010] The outer wall of the extrusion rod is provided with a plurality of sealing push blocks, and the two ends of the sealing push blocks are respectively attached to the inner wall of the injection tube and the outer wall of the extrusion rod.

[0011] Preferably, one end of the sealing ring is fixedly connected to a plurality of sliding rods, and the sliding rods are movably inserted into the sealing push block;

[0012] A spring is fitted on the outer wall of the slide rod, and the two ends of the spring are respectively connected to the sealing push block and the sealing ring, which are used to push the sealing push block to move towards the extrusion screw side.

[0013] Preferably, a conical head is fixedly connected to the left side of the extrusion rod, and the conical head has a receiving cavity inside for receiving the counterflowing injection molding material;

[0014] The outer wall of the conical head has multiple counterflow holes that are connected to the receiving cavity, used to guide the injection molding material to flow counterflow into the receiving cavity.

[0015] Preferably, the inner wall of the receiving cavity is provided with an extrusion plate for extruding the injection molding material in the receiving cavity;

[0016] A second spring is installed inside the receiving cavity, and the second spring is connected to the extrusion plate to push the extrusion plate to move towards the counterflow hole side.

[0017] The present invention adopts the above technical solution, which can bring the following beneficial effects:

[0018] 1. The screw with the anti-backflow structure, by setting a sealing spiral and a sealing pusher, and cooperating with the extrusion spiral, can effectively seal the inside of the injection tube and prevent the molten injection material from flowing back during the extrusion process. This design significantly improves the extrusion effect, ensures that the injection material can move forward smoothly, and avoids uneven injection or blockage caused by backflow.

[0019] 2. The screw of the anti-backflow structure has a sealing spiral installed in the mounting groove of the extrusion spiral. Its inner wall is tightly fitted with the inner wall of the injection tube, which further enhances the airtightness between the injection tube and the extrusion spiral. At the same time, the sealing push block can move flexibly under the action of spring one, further optimizing the sealing effect and ensuring the stability and reliability of the injection molding process.

[0020] 3. The anti-backflow screw, with its conical head housing cavity and backflow hole design, can automatically accommodate backflowing injection material when injection stops, balancing the pressure inside the injection tube. When injection continues, spring two pushes the extrusion plate to extrude the injection material from the housing cavity, achieving automatic discharge and preventing injection material retention or backflow due to pressure changes.

[0021] 4. The screw with the anti-backflow structure not only pushes the injection molding material forward with the rotation of the extrusion screw, but also further compresses the injection molding material through the cooperation of the sealing pusher, improving the propulsion effect. This design significantly improves the extrusion efficiency and ensures that the injection molding material can be extruded quickly and evenly. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a schematic cross-sectional view of the present invention.

[0024] Figure 3 This is a cross-sectional exploded structural diagram of the present invention.

[0025] In the diagram: 1. Injection tube; 2. Feed tube; 3. Extrusion rod; 4. Extrusion screw; 5. Sealing screw; 6. Sealing push block; 7. Sealing ring; 8. Slide rod; 9. Spring 1; 10. Conical head; 11. Receiving cavity; 12. Counterflow hole; 13. Extrusion plate; 14. Spring 2. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1-3 One embodiment of this utility model is: a screw with an anti-backflow structure, including an injection tube 1 and an extrusion rod 3, the extrusion rod 3 being disposed on the inner wall of the injection tube 1 for extruding injection molding material, and further comprising:

[0028] The feed pipe 2 is fixedly connected to the outer wall of the injection tube 1, and the connection is connected to each other, for introducing molten injection material into the injection tube 1;

[0029] The extrusion screw 4 is located on the outer wall of the extrusion rod 3 and is spirally arranged. When it rotates, it squeezes the injection material inside the injection tube 1 to move.

[0030] The outer wall of the extrusion screw 4 is fitted with the inner wall of the injection tube 1, and the outer wall of the extrusion screw 4 is provided with an installation groove, and a sealing screw 5 is installed in the installation groove. The inner wall of the sealing screw 5 is fitted with the inner wall of the injection tube 1 to seal the airtightness between the injection tube 1 and the extrusion screw 4.

[0031] A sealing ring 7 is provided on the outer wall of the extrusion rod 3, and the sealing ring 7 is fixedly connected to the inner wall of the injection tube 1;

[0032] The outer wall of the extrusion rod 3 is provided with multiple sealing push blocks 6, and the two ends of the sealing push blocks 6 are respectively attached to the inner wall of the injection tube 1 and the outer wall of the extrusion rod 3.

[0033] One end of the sealing ring 7 is fixedly connected to multiple sliding rods 8, and the sliding rods 8 are movably inserted into the sealing push block 6;

[0034] A spring 9 is fitted on the outer wall of the slide bar 8, and the two ends of the spring 9 are connected to the sealing push block 6 and the sealing ring 7 respectively, which are used to push the sealing push block 6 to move towards the extrusion screw 4.

[0035] A conical head 10 is fixedly connected to the left side of the extrusion rod 3. The conical head 10 has a receiving cavity 11 inside, which is used to receive the reverse-flowing injection molding material.

[0036] The outer wall of the conical head 10 is provided with multiple counterflow holes 12, which are connected to the receiving cavity 11 to guide the injection molding material to flow back into the receiving cavity 11.

[0037] The inner wall of the receiving cavity 11 is provided with an extrusion plate 13 for extruding the injection molding material in the receiving cavity 11;

[0038] A second spring 14 is provided inside the receiving cavity 11, and the second spring 14 is connected to the extrusion plate 13 to push the extrusion plate 13 to move towards the side of the counterflow hole 12.

[0039] Working principle: When using this anti-backflow screw, after the molten injection material enters the injection tube 1 from the feed pipe 2, the extrusion rod 3 is rotated by the external drive device. The molten injection material on the injection tube 1 is rotated by the extrusion rod 3, which drives the extrusion screw 4 to rotate, compressing the space inside the injection tube 1. This pushes the molten injection material to the left and extrudes it outward.

[0040] Furthermore, during the extrusion of molten injection molding material, the sealing screw 5 on the extrusion screw 4 further improves the sealing with the inside of the injection tube 1, preventing the molten injection molding material from flowing back and improving the extrusion effect;

[0041] Furthermore, by rotating the extrusion screw 4, one side of it is continuously squeezed against the sealing push block 6, generating a push. When the extrusion screw 4 disengages from the sealing push block 6 in turn, the spring 9 pushes the sealing push block 6 to reset. At this time, the sealing push block 6 will move to the left on the slide bar 8, thereby compressing the molten injection molding material to the left and improving the pushing effect.

[0042] Based on this, when the molten injection material stops injection, if the pressure on the left side is too high, it will force the injection material to move to one side of the base spiral 4. At this time, the internal pressure of the injection tube 1 will increase. The molten injection material will then enter the receiving cavity 11 through the counterflow hole 12 for storage to balance the internal pressure. When the injection continues, the internal pressure of the injection tube 1 decreases. At this time, under the push of the second spring 14, the extrusion plate 13 is pushed to move, which will automatically extrude the molten injection material inside the receiving cavity 11 to achieve the effect of automatic discharge.

[0043] This utility model provides a screw with an anti-backflow structure. There are many methods and approaches to implement this technical solution. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model. All components not explicitly stated in this embodiment can be implemented using existing technology.

Claims

1. A screw preventing a backflow structure comprising an injection tube (1) and an extrusion rod (3) provided to an inner wall of the injection tube (1) for extruding an injection material, characterized in that, Also include: The feeding pipe (2) is fixedly connected to the outer wall of the injection pipe (1), and the connection is communicated, which is used for guiding the molten injection material into the injection pipe (1); The extrusion screw (4) is arranged on the outer wall of the extrusion rod (3) and is spirally arranged, and rotates to extrude the injection material in the injection pipe (1) to move.

2. A reverse flow preventing structure screw according to claim 1, wherein: The outer wall of the extrusion screw (4) is attached to the inner wall of the injection pipe (1), and the outer wall of the extrusion screw (4) is provided with a mounting groove, and a sealing screw (5) is mounted in the mounting groove, and the inner wall of the sealing screw (5) is attached to the inner wall of the injection pipe (1), which is used for sealing the air tightness between the injection pipe (1) and the extrusion screw (4).

3. A reverse flow preventing structure screw according to claim 2, wherein: The outer wall of the extrusion rod (3) is provided with a sealing ring (7), and the sealing ring (7) is fixedly connected to the inner wall of the injection pipe (1); The outer wall of the extrusion rod (3) is provided with a plurality of sealing push blocks (6), and the two ends of the sealing push block (6) are respectively attached to the inner wall of the injection pipe (1) and the outer wall of the extrusion rod (3).

4. A reverse flow preventing structure screw according to claim 3, wherein: One end of the sealing ring (7) is fixedly connected with a plurality of slide rods (8), and the slide rod (8) is movably inserted into the sealing push block (6); The outer wall of the slide rod (8) is sleeved with a spring (9), and the two ends of the spring (9) are respectively connected with the sealing push block (6) and the sealing ring (7), which is used for pushing the sealing push block (6) to move to one side of the extrusion screw (4).

5. A reverse flow preventing structure screw according to claim 4, wherein: The left side of the extrusion rod (3) is fixedly connected with a conical head (10), and the inside of the conical head (10) is provided with a containing cavity (11) for containing the backflow of the injection material; The outer wall of the conical head (10) is provided with a plurality of backflow holes (12) which are communicated with the containing cavity (11) and are used for guiding the injection material to flow back into the containing cavity (11).

6. A reverse flow preventing structure screw according to claim 5, wherein: The inner wall of the containing cavity (11) is provided with an extrusion plate (13) for extruding the injection material in the containing cavity (11); The inside of the containing cavity (11) is provided with a spring (14), and the spring (14) is connected with the extrusion plate (13), which is used for pushing the extrusion plate (13) to move to one side of the backflow hole (12).

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