PVC extrusion die for improving impact performance of pipe

Abstract

The utility model discloses a PVC extrusion mould that improves the impact performance of pipe material, which comprises a shunt and a rear mould body, a plurality of shunt channels are arranged on the shunt, a confluence body is arranged between the shunt and the rear mould body, a plurality of confluence channels corresponding to the number of shunt channels are arranged on the confluence body, a flow guide plate is arranged on the side of the confluence body away from the shunt and located in the rear mould body and adhered to the inner wall of the rear mould body, a staggered confluence end is arranged at the end of the flow guide plate away from the shunt, the flow guide plate comprises a flow guide surface, and a flow guide cavity is formed between the flow guide surface and the rear mould body. The utility model provides a PVC extrusion mould that improves the impact performance of pipe material. When the materials converge at the confluence body, the staggered confluence end breaks and disrupts the convergence line, so that the convergence line is not in the same plane, and the influence of the convergence line on the impact performance of the product is eliminated.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, and in particular to a PVC extrusion mold for improving the impact performance of pipes. Background Technology

[0002] For example, announcement number "CN218701232U" discloses "an extrusion pipe die head using a turbine-driven dual-shaft orientation stretching device," comprising a die head body connector, a flow divider bracket, a die head body, a die orifice, and a pressure ring sleeve forming an external cavity structure. The cavity contains a flow divider cone, a mandrel connecting sleeve, a mandrel transition sleeve, and a hollow mandrel. A turbine-connected output shaft is located between the flow divider cone and the mandrel connecting sleeve. One end of the output shaft is fixedly connected to a steel wire rope, and the other end of the steel wire rope is connected to the orientation stretching device. The orientation stretching device is moved back and forth by the output shaft, which winds the steel wire rope around it, caused by rotating the turbine handle. However, in practical applications, products produced by this type of die will exhibit convergence lines. These convergence lines are generated after the material flows through the die, resulting in the worst impact performance at these convergence lines. Summary of the Invention

[0003] In view of the problem mentioned in the background art that the existing technology has poor impact resistance at the support line, this utility model provides a PVC extrusion die to improve the impact performance of the pipe. When the materials merge at the confluence point, the staggered confluence end will break and disrupt the confluence line, so that they are not on the same plane, thus eliminating its impact on the impact performance of the product.

[0004] To achieve the above objectives, the present invention adopts the following technical solution.

[0005] A PVC extrusion die for improving the impact performance of pipes includes a flow divider and a rear die body. The flow divider has a plurality of flow channels. A confluence flow is provided between the flow divider and the rear die body. The confluence flow has confluence channels corresponding to the number of flow channels. A guide plate is provided on the side of the confluence flow away from the flow divider, located inside the rear die body and abutting the inner wall of the rear die body. The guide plate has a staggered confluence end on the side away from the flow divider. The guide plate includes a guide surface, and a guide cavity is formed between the guide surface and the rear die body. In existing technologies, a splitter and a merging flow are typically incorporated. The splitter divides the material into multiple streams that flow into the merging flow. Upon reaching the merging flow, these streams merge together. During this merging process, a merging line is formed at the junction of the multiple streams. The impact resistance at the merging line is relatively poor compared to other areas, thus increasing the risk of damage and cracking under stress. Therefore, to address the aforementioned issues, this application incorporates a guide plate on the merging flow. The guide plate is fitted to the rear mold body, and the guide surface on the guide plate is aligned with the rear mold body. A flow guiding cavity is formed between the mold bodies. After the material is separated into different flow channels, it flows through several confluence channels in the confluence flow and then enters the flow guiding cavity. The flow guiding cavity guides the material. The end of the flow guiding plate is provided with a staggered confluence end. The staggered confluence end in this application is different from the conventional mold confluence point. The confluence line of the staggered confluence end in this application is not a complete straight line, but forms several staggered confluence lines. This makes the formed confluence lines not all on the same plane, thereby improving the impact resistance at this point.

[0006] Preferably, the merging channel includes a channel opening located on the side away from the flow divider, and guide plates are located on both sides of the channel opening. Positioning the guide plates on both sides of the channel opening allows them to uniformly guide the material flowing out of the channel opening, ensuring uniform material flow within the guiding cavity, improving molding quality, and preventing blockages at the channel opening, thus avoiding the formation of dead zones.

[0007] Preferably, the flow channel opening and the guide plate are tilted at the same angle. The guide surface on the guide plate is tilted, which makes the guide plate have a toothed structure. The flow channel opening is tilted at the same angle as the guide plate, which can improve the uniform flow of material flowing out of the flow channel opening. It can prevent the material from rushing out of the flow channel quickly due to strong extrusion pressure, so that the material speed in the axial direction of the branch channel is too fast, while the material speed in the main channel and the guide surface is slower. This effectively prevents the problem of uneven material flow rate and material accumulation due to slow speed at the guide surface.

[0008] Preferably, the confluence channel includes a flow channel opening, which includes an expansion ramp. The expansion ramp smoothly transitions into the guide surface to form a guide surface. By providing an expansion ramp at the flow channel opening and ensuring a smooth transition between the expansion ramp and the guide surface, significant obstruction is avoided during material flow, preventing sharp angles and ensuring rapid material filling of the cavity. This allows more material to flow to both sides, preventing material accumulation.

[0009] Preferably, the staggered confluence end includes several tail corners, with each adjacent tail corner being staggered. The staggered confluence end is provided with several tail corners, typically two, which have a toothed structure. The staggered arrangement of the tail corners causes the guide surfaces on both sides of the guide plate to converge at different locations, thus forming staggered confluence lines.

[0010] Preferably, the flow channel includes an inlet and an outlet, and the flow area of ​​the flow channel gradually decreases from the inlet towards the outlet. The inlet and outlet are provided on the flow channel, and the cross-sectional area of ​​the flow channel is not the same at different points. The flow channel inside the flow channel is a gradually compressing structure. The diameter at the inlet matches the size of the extruder's confluence core, and then the diameter gradually decreases within the flow channel structure. This allows compression to begin as soon as the material enters the die, promoting plasticization of the preform and resulting in dense compression of the material.

[0011] Preferably, the rear mold body is connected to the front mold body on the side away from the confluence fluid, and the front mold body is connected to the inner mold body. The inner mold body is connected to the end of the confluence fluid, and an extrusion channel is formed between the front mold body and the inner mold body. The front mold body is connected to the rear mold body, while the inner mold body is connected to the confluence fluid. An extrusion channel is formed between the front mold body and the inner mold body, and the extrusion channel communicates with the guide cavity, allowing the material flowing back in the backflow cavity to enter the extrusion channel. The inner mold body is provided with a ring of damping protrusions, which plays a role in stabilizing the flow and allowing the material to flow more evenly at this point.

[0012] Preferably, the front mold body is connected to a die on the side away from the rear mold body, and the inner mold body is connected to a mandrel on the side away from the confluence fluid. A forming flow channel is formed between the mandrel and the die. The forming flow channel is connected to the extrusion flow channel.

[0013] Preferably, a connecting section is provided between the front mold body and the rear mold body. Furthermore, a connecting section is provided between the front mold body and the rear mold body, and the connecting section is connected to the rear mold body and the mixing fluid by bolts, thereby ensuring structural stability and facilitating processing and subsequent maintenance.

[0014] Preferably, the system also includes several corner joints, each with rounded corners. To ensure uniform and efficient material flow within the flow channel, all corner joints must be rounded to create a smooth, circular transition.

[0015] The beneficial effects of this utility model are as follows: (1) Due to the flow guiding structure, the material will be filled and flowed evenly inside the flow guiding cavity. When the material merges at the confluence point, the staggered confluence end will break and disrupt the confluence line, making it not on the same plane, thus eliminating its impact on the product's impact performance. (2) Ensure the stability and uniformity of materials during internal flow to improve molding quality. Attached Figure Description

[0016] Figure 1 This is an isometric view of the combined fluid in this utility model.

[0017] Figure 2 This is a cross-sectional view of Example 1.

[0018] Figure 3 yes Figure 1 A magnified view of a portion of point A in the middle.

[0019] Figure 4 This is a cross-sectional view of Example 3.

[0020] Figure 5 yes Figure 1 A magnified view of a section at point B in the middle.

[0021] In the picture: 1-way flow divider, 11-way flow channels, 111-inlet, 112-outlet; 2. Rear mold body; 3. Flow confluence, 31. Flow confluence channel, 32. Flow guide plate, 321. Staggered Flow Confluence End, 322. Flow guide surface, 323. Tail End Angle, 33. Flow guide cavity, 34. Flow channel opening, 341. Expansion ramp, 35. Flow guide curved surface. 4. Front mold body, 5. Inner mold body, 6. Extrusion runner, 7. Die, 8. Mandrel, 9. Molding runner, 10. Connecting section. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] Example 1: like Figure 1 , 2As shown, a PVC extrusion die for improving the impact performance of pipes includes a flow divider 1 and a rear die body 2. The flow divider 1 is provided with a plurality of flow divider channels 11. A confluencer 3 is provided between the flow divider 1 and the rear die body 2. The confluencer 3 is provided with confluencer channels 31 corresponding to the number of flow divider channels 11. A guide plate 32 is provided on the side of the confluencer 3 away from the flow divider 1, located inside the rear die body 2 and attached to the inner wall of the rear die body 2. A staggered confluence end 321 is provided on the end of the guide plate 32 away from the flow divider 1. The guide plate 32 includes a guide surface 322. A guide cavity 33 is formed between the guide surface 322 and the rear die body 2. In existing technologies, a splitter fluid 1 and a merging fluid 3 are typically provided. The splitter fluid 1 divides the material into multiple streams that flow into the merging fluid 3. Upon passing through the merging fluid 3, the multiple streams of material are then merged together. During this merging process, a merging line is generated at the junction of the multiple streams. The impact resistance at the merging line is relatively poor compared to other areas, thus increasing the risk of damage and cracking under stress. Therefore, to address the above problems, this application provides a guide plate 32 on the merging fluid 3. The guide plate 32 is attached to the rear mold body 2, and the guide surface 322 on the guide plate 32 is flush with the rear mold body 2. A flow guiding cavity 33 is formed between the flow guides. After the material is separated by the flow divider 1, it flows through several confluence channels 31 on the confluence 3 and then enters the flow guiding cavity 33. The flow guiding cavity 33 guides the material. The end of the flow guide plate 32 is provided with a staggered confluence end 321. The staggered confluence end 321 in this application is different from the conventional mold confluence point. The confluence line of the staggered confluence end 321 in this application is not a complete straight line, but is formed with several staggered confluence lines. This makes the formed confluence lines not all on the same plane, thereby improving the impact resistance at this point.

[0024] Example 2: like Figure 1 , 2As shown in Figure 3, a PVC extrusion mold for improving the impact performance of pipes includes a flow divider 1 and a rear mold body 2. The flow divider 1 is provided with two flow dividers 11. A confluencer 3 is provided between the flow divider 1 and the rear mold body 2. The confluencer 3 is provided with confluencer channels 31 corresponding to the number of flow dividers 11. A guide plate 32 is provided on the side of the confluencer 3 away from the flow divider 1, located inside the rear mold body 2 and attached to the inner wall of the rear mold body 2. There are two guide plates 32, which are staggered on both sides of the confluencer channels 31. The end of the guide plate 32 away from the flow divider 1 is provided with a staggered confluence end 321, which includes two tail corners 323. The guide plate 32 includes a guide surface 322. A guide cavity 33 is formed between the guide surface 322 and the rear mold body 2. The two tail corners 323 form four guide surfaces 322, wherein the four guide surfaces 322 intersect each other, and each adjacent tail corner 323 is staggered. In existing technologies, a splitter fluid 1 and a merging fluid 3 are typically provided. The splitter fluid 1 divides the material into multiple streams that flow into the merging fluid 3. Upon passing through the merging fluid 3, the multiple streams of material are then merged together. During this merging process, a merging line is generated at the junction of the multiple streams. The impact resistance at the merging line is relatively poor compared to other areas, thus increasing the risk of damage and cracking under stress. Therefore, to address the above problems, this application provides a guide plate 32 on the merging fluid 3. The guide plate 32 is attached to the rear mold body 2, and the guide surface 322 on the guide plate 32 is flush with the rear mold body 2. A flow guiding cavity 33 is formed between the flow divider 1 and the flow guide 3. After the material is separated, it flows through several confluence channels 31 on the confluence 3 and then enters the flow guiding cavity 33. The flow guiding cavity 33 guides the material. The end of the flow guide plate 32 is provided with a staggered confluence end 321. The staggered confluence end 321 in this application is different from the conventional mold confluence point. The confluence line of the staggered confluence end 321 in this application is not a complete straight line, but forms several staggered confluence lines. This makes the formed confluence lines not all on the same plane, thereby improving the impact resistance at this point. The staggered confluence end 321 is provided with tail corners 323. There are two tail corners 323. The tail corners 323 have a tooth-like structure and are staggered. This makes the flow guiding surfaces 322 on both sides of the flow guide plate 32 converge at different positions at this point, thereby forming staggered confluence lines.

[0025] After being extruded by the screw, the material enters the distributor 1. After being split, it enters two streams into the cavity of the confluence fluid 3 and the rear die 2. Due to the flow guiding structure, the material flows evenly within the cavity. When the material merges at the confluence fluid, the staggered confluence end 321 breaks and disrupts the confluence line, preventing it from being on the same plane and eliminating its impact on the product's impact performance. Throughout the extrusion process, compared to traditional die structures, the product extruded by this invention does not produce obvious support lines, thus improving its impact performance and effectively solving the problem of poor impact performance of PVC pipes.

[0026] Example 3: like Figure 4 As shown, a PVC extrusion die for improving the impact performance of pipes includes a flow divider 1 and a rear die body 2. The flow divider 1 has several flow channels 11. A confluence flow 3 is disposed between the flow divider 1 and the rear die body 2. The confluence flow 3 has confluence channels 31 corresponding to the number of flow channels 11. A guide plate 32 is disposed on the side of the confluence flow 3 away from the flow divider 1, located inside the rear die body 2 and adhering to the inner wall of the rear die body 2. A staggered confluence end 321 is disposed at the end of the guide plate 32 away from the flow divider 1. The guide plate 32 includes a guide surface 322, and a guide cavity 33 is formed between the guide surface 322 and the rear die body 2. The staggered confluence end 321 includes several tail corners 323, with each adjacent tail corner 323 staggered. A connecting section 10 is connected to the side of the rear mold body 2 away from the confluent 3. A front mold body 4 is connected to the side of the connecting section 10 away from the rear mold body 2. An inner mold body 5 is connected inside the front mold body 4, and the inner mold body 5 is connected to the end of the confluent 3. An extrusion channel 6 is formed between the front mold body 4 and the inner mold body. A die 7 is connected to the side of the front mold body 4 away from the rear mold body 2. A mandrel 8 is connected to the end of the inner mold body 5 away from the confluent 3. A forming channel 9 is formed between the mandrel 8 and the die 7. The forming channel 9 communicates with the extrusion channel 6. The system also includes several corner joints with rounded corners.

[0027] In this application, a guide plate 32 is provided on the confluence fluid 3. The guide plate 32 is attached to the rear mold body 2, and a guide cavity 33 is formed between the guide surface 322 on the guide plate 32 and the rear mold body 2. After the material is separated by the split fluid 1, it flows through several confluence channels 31 on the confluence fluid 3 and then enters the guide cavity 33. The material is guided by the guide cavity 33. The end of the guide plate 32 is provided with a staggered confluence end 321. The staggered confluence end 321 in this application is different from the conventional mold confluence point. The confluence line of the staggered confluence end 321 in this application is not a complete straight line, but forms several staggered confluence lines, so that the formed confluence lines are not all on the same plane, thereby improving the impact resistance at this point. The staggered confluence end 321 is provided with tail end angles 323, of which several are provided, generally two. The tail end angles 323 have a toothed structure and are staggered, so that the guide surfaces 322 on both sides of the guide plate 32 converge at different positions, thus forming staggered confluence lines. The front mold body 4 is connected to the rear mold body 2, while the inner mold body 5 is connected to the confluence fluid 3. An extrusion channel 6 is formed between the front mold body 4 and the inner mold body 5. The extrusion channel 6 is connected to the guide cavity 33, allowing the material flowing back in the backflow cavity to enter the extrusion channel 6. The inner mold body 5 is provided with a ring of damping protrusions, which plays a role in stabilizing the flow and allowing the material to flow more evenly here. A connecting section 10 is provided between the front mold body 4 and the rear mold body 2. The connecting section 10 is connected to the rear mold body 2 and the confluence fluid 3 by bolts, thereby ensuring the stability of the structure and facilitating processing and subsequent maintenance. In order to ensure that the material inside the flow channel flows evenly and reasonably, all corners and joints must be rounded to make them smooth transitions.

[0028] Example 4: like Figure 1 , 5As shown, a PVC extrusion die for improving the impact performance of pipes includes a flow divider 1 and a rear die body 2. The flow divider 1 has several flow channels 11. A confluence flow 3 is disposed between the flow divider 1 and the rear die body 2. The confluence flow 3 has confluence channels 31 corresponding to the number of flow channels 11. A guide plate 32 is disposed on the side of the confluence flow 3 away from the flow divider 1, located inside the rear die body 2 and adhering to the inner wall of the rear die body 2. A staggered confluence end 321 is disposed at the end of the guide plate 32 away from the flow divider 1. The guide plate 32 includes a guide surface 322, and a guide cavity 33 is formed between the guide surface 322 and the rear die body 2. The confluence channel 31 includes a flow outlet 34 disposed on the side away from the flow divider 1, and the guide plate 32 is disposed on both sides of the flow outlet 34. The flow outlet 34 and the guide plate 32 have the same inclination angle. The confluence channel 31 includes a flow channel opening 34, which includes an expansion ramp 341. The expansion ramp 341 is smoothly connected to the guide surface 322 to form a guide surface 35. The branch channel 11 includes an inlet 111 and an outlet 112. The flow area of ​​the branch channel 11 gradually decreases from the inlet 111 toward the outlet 112.

[0029] In this application, a guide plate 32 is provided on the confluence fluid 3. The guide plate 32 is attached to the rear mold body 2, and a guide cavity 33 is formed between the guide surface 322 on the guide plate 32 and the rear mold body 2. After the material is separated by the split fluid 1, it flows through several confluence channels 31 on the confluence fluid 3 and then enters the guide cavity 33. The material is guided by the guide cavity 33. The end of the guide plate 32 is provided with a staggered confluence end 321. The staggered confluence end 321 in this application is different from the conventional mold confluence point. The confluence line of the staggered confluence end 321 in this application is not a complete straight line, but forms several staggered confluence lines, so that the formed confluence lines are not all on the same plane, thereby improving the impact resistance at this point. The guide plates 32 are positioned on both sides of the flow channel opening 34, enabling them to uniformly guide the material flowing out of the flow channel opening 34. This ensures uniform material flow within the guide cavity 33, improves molding quality, and prevents blockage at the flow channel opening 34, thus avoiding dead zones. The guide surface 322 on the guide plate 32 is inclined, giving it a toothed structure. The flow channel opening 34 is set at the same inclination angle as the guide plate 32, which improves the uniform flow of material flowing out of the flow channel opening 34. This prevents the material from rushing out of the flow channel due to strong extrusion pressure, thus preventing excessively high material speed in the axial direction of the branch channel 11 while maintaining a slower material speed in the main flow channel and at the guide surface 322. This effectively prevents uneven material flow and material accumulation at the guide surface 322 due to excessively slow speed. The flow channel 34 is provided with an expansion ramp 341, which smoothly transitions to the guide surface 322. This prevents significant obstruction during material flow, avoids sharp bends, ensures rapid filling of the cavity, and allows more material to flow to both sides, preventing material accumulation. The flow channel 11 has an inlet 111 and an outlet 112. The cross-sectional area of ​​the flow channel 11 varies. The flow channel 11 inside the flow channel 1 is a gradually compressing structure. The diameter at the inlet matches the size of the extruder's confluence core, and then gradually decreases in diameter within the flow channel 11. This allows compression to begin as soon as the material enters the mold, promoting material plasticization and resulting in dense compression.

Claims

1. A PVC extrusion die for improving impact properties of pipe, characterized by, The device includes a flow divider and a rear mold body. The flow divider is provided with a plurality of flow channels. A confluence flow is provided between the flow divider and the rear mold body. The confluence flow is provided with confluence channels corresponding to the number of flow channels. A guide plate is provided on the side of the confluence flow away from the flow divider, located inside the rear mold body and attached to the inner wall of the rear mold body. A staggered confluence end is provided on the end of the guide plate away from the flow divider. The guide plate includes a guide surface. A guide cavity is formed between the guide surface and the rear mold body.

2. The PVC extrusion die for improving the impact performance of pipe material according to claim 1, characterized in that, The merging channel includes a channel opening located on the side away from the flow divider, and the guide plates are located on both sides of the channel opening.

3. The PVC extrusion die for improving the impact performance of pipe material according to claim 2, characterized in that, The flow channel opening and the guide plate are tilted at the same angle.

4. The PVC extrusion die for improving the impact performance of pipe material according to claim 1, characterized in that, The confluence channel includes a flow channel opening, which includes an expansion ramp. The expansion ramp smoothly transitions and connects with the guide surface to form a guide surface.

5. The PVC extrusion die for improving the impact performance of pipe material according to claim 1, characterized in that, The staggered confluence end includes several tail corners, and each adjacent tail corner is staggered.

6. The PVC extrusion die for improving the impact performance of pipe material according to claim 1, characterized in that, The diversion channel includes an inlet and an outlet, and the channel area of ​​the diversion channel gradually decreases from the inlet towards the outlet.

7. The PVC extrusion die for improving impact performance of pipe material according to any one of claims 1-6, characterized in that, The rear mold body is connected to the front mold body on the side away from the confluence fluid. The front mold body is connected to the inner mold body, which is connected to the end of the confluence fluid. An extrusion channel is formed between the front mold body and the inner mold body.

8. The PVC extrusion die for improving the impact performance of pipe material according to claim 7, characterized in that, The front mold body is connected to a die on the side away from the rear mold body, and the inner mold body is connected to a mandrel on the side away from the confluence fluid. A forming flow channel is formed between the mandrel and the die.

9. The PVC extrusion die for improving the impact performance of pipe material according to claim 7, characterized in that, A connecting section connects the front mold body and the rear mold body.

10. The PVC extrusion die for improving impact performance of pipe material according to claim 1, wherein It also includes several corner joints, and the corner joints are provided with rounded corners.

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