Double-wall corrugated pipe extrusion die

Abstract

The utility model discloses an extrusion die for a double-wall corrugated pipe, which relates to the technical field of double-wall corrugated pipe production and particularly comprises a die holder connected with an extruder, a shell is arranged on one side of the die holder far away from the extruder, an inner cavity of the shell is provided with an outer die part and an inner die part, the outer side wall of the inner die part is tightly attached to the inner wall of the outer die part, and the outer die part is connected with the outer die part. An inner cavity of the outer die part is an outer runner, a first feeding port is formed in the inner side of the outer runner, a first connecting hole matched with the first feeding port is formed in the die base, an inner cavity of the inner die part is an inner runner, and a second feeding port is formed in the inner side of the inner runner. According to the double-wall corrugated pipe extrusion die, through the arrangement of the outer die part and the inner die part, the precision of the outer flow channel and the precision of the inner flow channel can be guaranteed, the extrusion die is convenient to use, and when the size of the flow channel is adjusted, the outer die part or the inner die part needs to be replaced, so that carbonization pollution caused by residual materials in a dead angle area in the flow channel can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of double-wall corrugated pipe production technology, specifically a double-wall corrugated pipe extrusion die. Background Technology

[0002] Double-wall corrugated pipe is a new type of pipe with a ring-shaped outer wall and a smooth inner wall. It is currently widely used as buried drainage pipe, underground cable pipe, etc., and has largely replaced traditional cast iron pipes, cement pipes, ordinary plastic pipes, and spiral corrugated pipes. The current production process for double-wall corrugated pipe typically involves the material being extruded from an extruder in a molten rod shape to an extrusion die. The extrusion die transforms the rod-shaped material into a ring, which is then extruded into a forming module. The material is formed under the constraints of the forming module (where a vacuum is used to ensure the outer wall adheres tightly to the outer wall of the forming module) and a water jacket (which cools and shapes the inner wall). The formed double-wall corrugated pipe continues to be conveyed forward, passing through a cooling water tank, and then to a cutting machine. The cutting machine cuts the corrugated pipe according to production needs and technical requirements.

[0003] The inner flow channel of existing double-wall corrugated pipe extrusion dies is usually formed by the gap between the inner die and the middle die, and the outer flow channel is usually formed by the gap between the middle die and the outer die. During assembly, due to the cumulative tolerance effect between the multiple die parts, this type of die is prone to loss of flow channel dimensional accuracy. Furthermore, when changing the die, the residual material in the dead corner area of ​​the flow channel is not easy to find, which can easily lead to carbonization and pollution. Based on this, this application proposes a double-wall corrugated pipe extrusion die. Utility Model Content

[0004] This invention provides a double-wall corrugated pipe extrusion die, which solves the problems of the three-layer die structure double-wall corrugated pipe extrusion die proposed in the background art, where the flow channel accuracy is easily affected by construction errors during assembly; and the residual material in the dead corner area of ​​the flow channel is not easy to find when replacing the die, which can easily lead to carbonization pollution.

[0005] This utility model provides the following technical solution: a double-walled corrugated pipe extrusion die, including a die base connected to an extruder. A shell is provided on the side of the die base away from the extruder. An outer die portion and an inner die portion are provided within the inner cavity of the shell. The outer wall of the inner die portion is tightly fitted to the inner wall of the outer die portion. The inner cavity of the outer die portion is an outer flow channel, and a feed inlet is provided on the inner side of the outer flow channel. A connecting hole adapted to the feed inlet is provided on the die base. The inner cavity of the inner die portion is an inner flow channel, and a second feed inlet is provided on the inner side of the inner flow channel. A connecting hole adapted to the second feed inlet is provided on the die base. Both the outer die portion and the inner die portion are connected to the die base via a connecting structure.

[0006] Preferably, the connection structure includes a fixing block and a fixing bolt threadedly connected to the fixing block. The mold base is provided with a fixing groove on the side near the outer shell. The fixing block is adapted to the fixing groove. A threaded hole adapted to the fixing bolt is provided in the middle of the fixing groove.

[0007] Preferably, a spring is provided on the inner side of the cavity of the fixing groove, and a push plate is fixedly connected to the other end of the spring.

[0008] Preferably, a feed inlet is provided on both sides of the closed end of the outer mold portion, and a feed inlet is provided on both sides of the closed end of the inner mold portion.

[0009] Preferably, the inner mold portion's closed end and the outer mold portion's blocking end are symmetrically provided with fixing blocks.

[0010] Preferably, the outer ring of the mold base is provided with a fixing flange, and the middle part of the mold base is provided with a central cooling rod.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The double-walled corrugated pipe extrusion die, through the setting of the outer die and the inner die, can ensure the accuracy of the outer flow channel and the accuracy of the inner flow channel, which facilitates the use of the extrusion die. When adjusting the flow channel size, it is necessary to replace the outer die or the inner die, thereby avoiding carbonization pollution caused by residual material in the dead corner area of ​​the flow channel.

[0013] 2. This double-walled corrugated pipe extrusion die utilizes the mutual limiting between the outer shell, outer mold part and inner mold part, and the positioning between the fixing block and the fixing groove to reduce installation errors and improve the installation accuracy of the extrusion die; the synergistic effect of the spring and the push plate allows the outer mold part and the inner mold part to be ejected by themselves, improving the convenience of replacing the outer mold part and the inner mold part. Attached Figure Description

[0014] Figure 1 This is a front view of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the back of the structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the internal structure of this utility model;

[0017] Figure 4 This is a schematic cross-sectional view of the structural mold base of this utility model;

[0018] Figure 5 This is an exploded view of the structure of this utility model.

[0019] In the diagram: 1. Mold base; 2. Outer shell; 3. Outer mold part; 4. Inner mold part; 5. Connecting hole two; 6. Connecting hole one; 7. Central cooling rod; 8. Fixing groove; 9. Spring; 10. Push plate; 11. Fixing block; 12. Feed port two; 13. Feed port one; 14. Fixing bolt; 15. Outer flow channel; 16. Inner flow channel. Detailed Implementation

[0020] 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.

[0021] This utility model provides an embodiment: Please refer to Figures 1-5 A double-wall corrugated pipe extrusion die includes a die base 1 connected to an extruder. The outer ring of the die base 1 is provided with a fixed flange. The die base 1 is connected to the extruder of the double-wall corrugated pipe through the fixed flange. A central cooling rod 7 is provided in the middle of the die base 1. The central cooling rod 7 directly cools the central area of ​​the die core through the internal circulating cooling medium (water / oil) to avoid the central temperature of the melt being too high. The central cooling rod 7 is prior art and will not be described in detail here.

[0022] A housing 2 is provided on the side of the die holder 1 away from the extruder. An outer die part 3 and an inner die part 4 are provided in the inner cavity of the housing 2. The outer side wall of the outer die part 3 is tightly fitted with the inner wall of the housing 2, and the outer side wall of the inner die part 4 is tightly fitted with the inner wall of the outer die part 3, so as to realize the positioning of the outer die part 3 and the inner die part 4 and ensure the installation accuracy of the die.

[0023] like Figure 1 and Figure 5 As shown, the inner cavity of the outer mold part 3 is the outer flow channel 15, and the inner cavity of the inner mold part 4 is the inner flow channel 16. With this configuration, the accuracy of the outer flow channel 15 and the inner flow channel 16 can be guaranteed during use. The dimensions of the outer flow channel 15 and the inner flow channel 16 can be set according to requirements and are not limited here.

[0024] The inner side of the outer flow channel 15 is provided with a feed inlet 13, and the die base 1 is provided with a connection hole 6 that matches the feed inlet 13. Both sides of the closed end of the outer die part 3 are provided with feed inlets 13. When the die is in use, the feed inlet 13 and the matching connection hole 6 are aligned. The double-wall corrugated tube production material in the extruder can enter the inner cavity of the outer flow channel 15 through the connection hole 6 and the feed inlet 13. The inner side of the inner flow channel 16 is provided with a feed inlet 2 12, and both sides of the closed end of the inner die part 4 are provided with feed inlets 2 12. The die base 1 is provided with a connection hole 2 5 that matches the feed inlet 2 12. When the die is in use, the feed inlet 2 12 and the connection hole 2 5 are aligned. The double-wall corrugated tube production material in the extruder can enter the inner flow channel 16 through the feed inlet 2 12 and the connection hole 2 5.

[0025] Both the outer mold part 3 and the inner mold part 4 are connected to the mold base 1 via a connecting structure. The connecting structure includes a fixing block 11 and a fixing bolt 14 threadedly connected to the fixing block 11. A fixing groove 8 is provided on the side of the mold base 1 near the outer shell 2. The fixing block 11 is adapted to the fixing groove 8. A threaded hole adapted to the fixing bolt 14 is provided in the middle of the fixing groove 8. Fixing blocks 11 are symmetrically arranged at the closed end of the inner mold part 4 and the sealing end of the outer mold part 3. Through the connecting structure, when the fixing block 11 is inserted into the fixing groove 8, the fixing bolt 14 can be used to fix either the outer mold part 3 or the inner mold part 4 to the mold base 1. Furthermore, the outer mold part 3 and the inner mold part 4 can be quickly assembled and disassembled. During use, operators can replace the appropriate outer mold part 3 and inner mold part 4 as needed, and change the dimensions of the inner flow channel 16 and the outer flow channel 15, thereby enabling the mold to adapt to various sizes of double-wall corrugated pipes and improving its adaptability. The fixing bolt 14 has a pre-tightening design to prevent loosening due to vibration.

[0026] In addition, a spring 9 is provided on the inner side of the cavity of the fixing groove 8. The other end of the spring 9 is fixedly connected to a push plate 10. When the fixing block 11 is connected to the mold base 1 by the fixing bolt 14, the spring 9 is in a compressed state. When the fixing bolt 14 is separated from the fixing block 11, the push plate 10 can push the fixing block 11 outward under the action of the spring 9, so that the opening end of the outer mold part 3 or the opening end of the inner mold part 4 connected to the fixing block 11 can be in a protruding state, making it convenient for the staff to remove the outer mold part 3 or the inner mold part 4.

[0027] All electrical components involved in this application are prior art. Those skilled in the art understand their connection methods. With the help of those skilled in the art, all electrical components in this application and their compatible power supplies can be connected by wires. According to the actual situation, a suitable controller can be selected to meet the control requirements. For specific connections and control sequences, please refer to the description below. The electrical connection between each electrical component is completed in the order of operation. The detailed connection methods are well known in the art. The following mainly introduces the working principle and process, and will not describe the electrical control.

[0028] In summary: When using this double-wall corrugated pipe extrusion die, the extrusion die is fixed to the double-wall corrugated pipe extruder by a fixing flange. The double-wall corrugated pipe production material in the extruder can enter the inner flow channel 16 through the feed port 2 12 and the connecting hole 2 5. The double-wall corrugated pipe production material in the extruder can enter the inner cavity of the outer flow channel 15 through the connecting hole 1 6 and the feed port 13. The material in the inner flow channel 16 and the material in the outer flow channel 15 can be squeezed into the forming die of the double-wall corrugated pipe through the opening end of the extrusion die. During use, the operator can change the dimensions of the outer flow channel 15 and the inner flow channel 16 by replacing the outer mold part 3 and the inner mold part 4, thereby making the extrusion mold adaptable to double-walled corrugated pipes of various sizes and improving the versatility of the mold. Furthermore, during the removal of the outer mold part 3 and the inner mold part 4, the rebound force of the spring 9 can push the outer mold part 3 or the inner mold part 4 outward through the push plate 10, realizing the self-ejection of the outer mold part 3 and the inner mold part 4, which facilitates the replacement of the outer mold part 3 and the inner mold part 4.

[0029] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each structure adopt conventional technical means such as bolt connection that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art. Although the embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A double-wall corrugated pipe extrusion die comprising a die shoe (1) connected to an extruder, characterized in that: The mold base (1) is provided with a shell (2) away from the side of the extruder, the inner cavity of the shell (2) is provided with an outer mold part (3) and an inner mold part (4), the outer side wall of the inner mold part (4) is tightly fitted with the inner wall of the outer mold part (3), the inner cavity of the outer mold part (3) is an outer flow channel (15), the inner side of the outer flow channel (15) is provided with a feeding port one (13), the mold base (1) is provided with a connecting hole one (6) matched with the feeding port one (13), the inner cavity of the inner mold part (4) is an inner flow channel (16), the inner side of the inner flow channel (16) is provided with a feeding port two (12), the mold base (1) is provided with a connecting hole two (5) matched with the feeding port two (12); the outer mold part (3) and the inner mold part (4) are connected with the mold base (1) through a connecting structure.

2. A double wall corrugated pipe extrusion die according to claim 1, characterized in that: The connecting structure comprises a fixed block (11) and a fixed bolt (14) threadedly connected with the fixed block (11), the side of the mold base (1) close to the shell (2) is provided with a fixed groove (8), the fixed block (11) is matched with the fixed groove (8), and the middle part of the fixed groove (8) is provided with a threaded hole matched with the fixed bolt (14).

3. A double wall corrugated pipe extrusion die according to claim 2, characterized in that: The inner side of the inner cavity of the fixed groove (8) is provided with a spring (9), and the other end of the spring (9) is fixedly connected with a push plate (10).

4. A double wall corrugated pipe extrusion die according to claim 1, characterized in that: The two sides of the closed end of the outer mold part (3) are provided with feeding ports one (13), and the two sides of the closed end of the inner mold part (4) are provided with feeding ports two (12).

5. A double wall corrugated pipe extrusion die according to claim 2, characterized in that: The closed end of the inner mold part (4) and the closed end of the outer mold part (3) are symmetrically provided with fixed blocks (11).

6. A double wall corrugated pipe extrusion die according to claim 1, characterized in that: The outer ring of the mold base (1) is provided with a fixed flange, and the middle part of the mold base (1) is provided with a central cooling rod body (7).

Images