Extrusion forming device for HDPE double-wall corrugated pipe production

Abstract

The application belongs to the field of corrugated pipe production, in particular to an extrusion forming device for HDPE double-wall corrugated pipe production, which comprises an upper former and a lower former, the upper former and the lower former each comprise a conveyor and a plurality of forming dies, the surface of the conveyor is provided with a limiting groove, the bottom of the forming die is slidably connected in the limiting groove and connected with the conveying end of the conveyor, the top of the forming die is formed in a semicircular ring shape, through such a setting, not only can the raw material be closely attached to the die groove, but also the raw material can be uniformly diffused outward, through the proportion of internal air pressure and external negative pressure, a corrugated pipe completely matched with the forming die is prepared, and the product quality is further improved; at the same time, the negative pressure device is detachably arranged, can be removed from the forming die, does not need to be connected with the negative pressure pipeline from the outside, can independently carry out negative pressure adsorption work, and ensures the normal working process of negative pressure suction.

Description

Technical Field

[0001] This invention belongs to the field of corrugated pipe production, specifically an extrusion molding device for producing HDPE double-wall corrugated pipes. Background Technology

[0002] HDPE double-wall corrugated pipe is a new type of pipe made of high-density polyethylene with a corrugated outer layer and a smooth inner wall. Its unique corrugated structure gives it high ring stiffness, light weight, and low cost. The smooth inner wall results in low frictional resistance and strong water flow capacity. With its excellent corrosion resistance, flexibility, and impact resistance, it is widely used to replace traditional cement pipes in municipal drainage, sewage, agricultural irrigation, and cable sheathing applications.

[0003] Corrugated pipe extrusion molding process: HDPE raw material is heated and melted, and a pipe blank is formed through the extruder die head; the inner diameter is precisely controlled by internal water cooling or a shaping sleeve; the pipe blank is blown into corrugations under the action of compressed air or vacuum through an external corrugated die; it is rapidly cooled and shaped; and finally, it is continuously pulled out by a traction machine.

[0004] Traditional corrugated pipe extrusion molding equipment has a relatively simple structure, often simply extruding and molding the raw material. However, because the raw material is relatively soft before molding, it is difficult to form a shape that fits the mold, resulting in low quality corrugated pipes. Therefore, the present invention provides an extrusion molding apparatus for the production of HDPE double-wall corrugated pipes. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: The extrusion molding device for producing HDPE double-wall corrugated pipes according to the present invention includes an upper molding device and a lower molding device. Both the upper molding device and the lower molding device include a conveyor and multiple molding dies. A limiting groove is opened on the surface of the conveyor. The bottom of the molding die is slidably engaged in the limiting groove and connected to the conveying end of the conveyor. The top of the molding die is formed into a semi-circular ring. A mold groove is opened in the inner ring of the molding die. Negative pressure devices are provided on both sides of the molding die. Multiple adsorption holes communicating with the negative pressure devices are opened in the mold groove. To ensure the extrusion effect, a negative pressure device is used to expel the air pressure between the mold and the raw material, creating negative pressure. This not only ensures a tight fit between the raw material and the mold, but also allows the raw material to diffuse evenly outward. By matching the internal air pressure and the external negative pressure, a corrugated tube that perfectly fits the molding die is produced, further improving the quality of the finished product. At the same time, the negative pressure device is detachable and can be removed from the molding die. It does not require an external connection to a negative pressure pipeline and can perform negative pressure adsorption independently, ensuring the normal operation of the negative pressure extraction process.

[0007] Preferably, airflow holes communicating with adsorption holes are provided on both sides near the top of the molding die. A driver is provided on the outside of the negative pressure device to drive its operation. When the negative pressure device is working, it generates negative pressure, which is transmitted to the internal mold groove through the airflow holes to form negative pressure, ensuring that the raw material adheres to the mold groove. The driver can remotely control the operation of the negative pressure device without contact, and can use magnetic attraction or other methods to control the operation of the negative pressure device. In this way, the negative pressure device can generate negative pressure directly on the molding die without the need for electricity or negative pressure pipes, allowing the molding process to proceed smoothly and reducing the problem of negative pressure leakage when using pipes or other connecting equipment.

[0008] Preferably, the outer side of the molding die is provided with a connecting arm that moves with the molding die. The top of the connecting arm is fixedly connected to a series frame, which is connected to multiple drivers. Both sides of the molding die are fixedly connected to connecting seats that are adapted to the connecting arm. When the upper and lower molding dies are merged to form, the driver is located on the outer side of the molding die and controls the negative pressure device to generate negative pressure. After the two molding dies are separated, the driver stops driving. The connecting arm can be inserted into the connecting seat to ensure that the connecting arm is always located on the outer side of the connecting seat, thereby ensuring that the driver is always aligned with the negative pressure device.

[0009] Preferably, the negative pressure device has multiple extrusion grooves inside, and a rotating disk is rotatably connected to the extrusion groove. A lever is slidably engaged in the middle of the rotating disk. The negative pressure device has an airflow groove inside that connects to the outside and the extrusion groove. The rotating disk rotates, and the top of the rotating disk is sealed to the extrusion groove. When rotating, the lever slides due to the extrusion groove, thereby generating air pressure changes inside the extrusion groove, thus forming a constant airflow in the airflow groove and generating negative pressure on the surface of the mold groove.

[0010] Preferably, the outer surface of the rotating disk is composed of multiple magnetic blocks arranged in a row. The driver includes a drive motor fixedly connected to the series frame. A magnetic coupling disk is fixedly connected to the output end of the drive motor. The magnetic coupling disk and the rotating disk are arranged concentrically and parallel. The drive motor drives the magnetic coupling disk to rotate, and under the magnetic attraction, the magnetic blocks and the rotating disk rotate, thereby realizing the negative pressure pumping operation of the negative pressure device.

[0011] Preferably, the surface of the negative pressure device is provided with an adapter groove, the end of the series frame is fixedly connected to an adapter post, and the outside of the drive motor is fixedly connected to a protective cylinder. The end of the protective cylinder extends beyond the end face of the magnetic coupling disk. In order to ensure the installation position of the connecting arm, when the connecting arm is installed in place, the adapter post should be pressed against the adapter groove. In this state, the position is accurate during connection and the vibration problem during the movement of the connecting arm is reduced. When the adapter post and the adapter groove are pressed together, the protective cylinder will be pressed against the outside of the negative pressure device, ensuring the alignment and connection of the magnetic coupling disk and the rotating disk.

[0012] Preferably, the end of the connecting arm is fixedly connected to multiple insert rods, and multiple binding holes are opened through the surface of the insert rods. The surface of the connecting seat is opened with multiple insertion holes that are adapted to the insert rods. The side of the connecting seat is connected to a locking bolt that is adapted to the binding hole. In order to ensure the connection stability of the connecting arm, the insert rods are connected to the binding holes, and then the locking bolts are used for insertion and fixation to ensure that the connecting arm is firmly fixed to the connecting seat.

[0013] Preferably, the conveyor surface has two energized slots, and a pantograph is rotatably connected to the bottom of the connecting seat. The pantograph is located above the energized slots. To achieve electric drive of the drive motor, energized slots are provided on the conveyor surface. When the forming molds are merged, the pantograph will be in contact with the energized slots, completing the energization and allowing the drive motor to work. When the forming mold moves to the rear, the pantograph is no longer energized, the drive motor is turned off, and the negative pressure will also stop. This setting achieves the energization effect of the drive motor and also realizes the function of controlling the start and stop of negative pressure. At the same time, the detachable design of the connecting arm makes the forming mold more independent. Even if the connecting arm and the negative pressure device are removed, it can still work independently, increasing its applicability and facilitating disassembly and replacement in case of component failure. Alternatively, the negative pressure device can be converted into a direct electric drive, removing the connecting arm and the driver, and integrating the negative pressure device and the pantograph onto the forming mold. This method has a lower cost, but reduces maintenance and applicability.

[0014] Preferably, reinforcing ropes are fixed to both sides of the molding die, and a through hole is provided on the outer side of the connecting arm near the top. A fixing lock for fixing the reinforcing rope is installed on the outer side of the connecting arm near the top. By passing the reinforcing rope through the through hole and then fixing it with the fixing lock, the stability of the connecting arm can be improved and the smooth transmission of power can be ensured.

[0015] Preferably, the bottom of the forming mold is fixedly connected to a transmission seat connected to a conveyor, the two sides of the conveyor are detachable structures, the top of the forming mold is provided with multiple closed slots, and a closing block is inserted into several of the closed slots. Sealing gaskets are fixedly connected to both sides of the forming mold. After the two forming molds are merged, the closed slots and closing blocks are connected to each other to complete the mold closing. The airflow between the two can be connected through the closing blocks and closed slots. In this way, only a connecting arm and a driver need to be set on the conveyor below to complete the pneumatic conveying work. The sealing gasket can ensure the connection and sealing of adjacent forming molds.

[0016] The beneficial effects of this invention are as follows: 1. The extrusion molding device for producing HDPE double-wall corrugated pipes according to the present invention, through the setting of an upper molding device and a lower molding device, in order to ensure the extrusion effect, simultaneously uses a negative pressure device to discharge the air pressure between the die cavity and the raw material, forming a negative pressure. This not only ensures the tight fit between the raw material and the die cavity, but also allows the raw material to diffuse evenly outward. Through the ratio of internal air pressure and external negative pressure, a corrugated pipe that perfectly fits the molding die is produced, further improving the quality of the finished product. At the same time, the negative pressure device is detachable and can be removed from the molding die. It does not require an external connection to a negative pressure pipeline and can perform negative pressure adsorption work independently, ensuring the normal operation of the negative pressure extraction process.

[0017] 2. The extrusion molding device for producing HDPE double-wall corrugated pipes according to the present invention, wherein when the upper and lower molding dies are combined for molding, the driver is located just outside the molding die and controls the negative pressure device to generate negative pressure. After the two molding dies are separated, the driver stops driving. The connecting arm can be inserted into the connecting seat to ensure that the connecting arm is always located outside the connecting seat, thereby ensuring that the driver is always aligned with the negative pressure device. The drive motor drives the magnetic coupling disk to rotate, and under the magnetic attraction, it drives the magnetic block and the rotating disk to rotate, thus realizing the negative pressure extraction operation of the negative pressure device. Through this setting, the function of generating negative pressure without contact is realized, reducing the problem of negative pressure leakage when using pipes and other connecting equipment. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is a perspective view of the present invention; Figure 2 This is a perspective view of the molding device of the present invention; Figure 3 This is a perspective view of the molding die and part of the lower molding device of the present invention; Figure 4 This is a perspective view of the connecting arm of the present invention; Figure 5 This is a perspective view of the molding die of the present invention; Figure 6 This is a perspective view of the molding die and connecting arm of the present invention; Figure 7 This is a perspective view of the connecting arm and the driver of the present invention; Figure 8 This is an internal structural diagram of the negative pressure device of the present invention; In the diagram: 1. Lower forming device; 2. Upper forming device; 3. Conveyor; 4. Forming mold; 5. Limiting groove; 6. Power supply groove; 7. Mold groove; 8. Connecting arm; 9. Insert rod; 10. Binding hole; 11. Fixing lock; 12. Connecting frame; 13. Driver; 14. Sealing gasket; 15. Closing groove; 16. Closing block; 17. Reinforcing rope; 18. Negative pressure device; 19. Connecting seat; 20. Transmission seat; 21. Through hole; 22. Airflow hole; 23. Pantograph; 24. Locking bolt; 25. Adapter post; 26. Drive motor; 27. Protective cylinder; 28. Magnetic coupling plate; 29. ​​Adapter groove; 30. Airflow groove; 31. Rotating disk; 33. Extrusion groove; 34. Paddle; 35. Magnetic block. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0021] like Figures 1 to 8 As shown in the embodiment of the present invention, an extrusion molding device for producing HDPE double-wall corrugated pipe includes an upper molding device 2 and a lower molding device 1. Both the upper molding device 2 and the lower molding device 1 include a conveyor 3 and multiple molding dies 4. The surface of the conveyor 3 is provided with a limiting groove 5. The bottom of the molding die 4 is slidably engaged in the limiting groove 5 and connected to the conveying end of the conveyor 3. The top of the molding die 4 is formed into a semi-circular ring. The inner ring of the molding die 4 is provided with a mold groove 7. Negative pressure devices 18 are provided on both sides of the molding die 4. Multiple adsorption holes communicating with the negative pressure devices 18 are provided in the mold groove 7. By arranging the upper forming unit 2 and the lower forming unit 1 vertically, multiple forming dies 4 are merged between the upper forming unit 2 and the lower forming unit 1. When the multiple forming dies 4 are in a horizontal state, there is no gap between adjacent forming dies 4; gaps only occur when they are flipped over. Hydraulic lifting modules need to be installed on both sides of the upper forming unit 2 to control its lifting and lowering. During the forming process, the upper forming unit 2 is lowered, and the upper and lower forming dies 4 are joined together to form a ring structure. At the same time, the outlet end of the extruder is set at the end of the equipment, allowing the extruded raw material to enter the ring structure. Through the rotation of the two conveyors 3, the two sets of forming dies 4 move in the same direction. After the extruded raw material is formed in the first ring structure, as the ring structure moves backward, in conjunction with the continuous extrusion of the extruder, a non-fractured corrugated tube can be formed. The completed corrugated tube will be continuously discharged from the rear end of the equipment. The separated forming dies 4 allow the corrugated tube to be easily demolded, thus completing the forming process. In order to manufacture... To produce a double-walled corrugated pipe, the center of the extruder's end needs to continuously eject airflow, causing the inner wall of the corrugated pipe being formed to be subjected to uniform outward extrusion. Due to the presence of the die groove 7, the outer wall of the corrugated pipe forms the same corrugated groove as the die groove 7. As the corrugated pipe continues to form, the internal air pressure can be better concentrated at the forming position at the end, ensuring the quality of the corrugated pipe formation. Under the internal extrusion action, the raw material is squeezed into the die groove 7. To ensure the extrusion effect, a negative pressure device 18 is used to discharge the air pressure between the die groove 7 and the raw material, forming a negative pressure. This not only ensures the tight fit between the raw material and the die groove 7, but also allows the raw material to diffuse evenly outward. Through the ratio of internal air pressure and external negative pressure, a corrugated pipe that perfectly fits the forming mold 4 is produced, further improving the quality of the finished product. At the same time, the negative pressure device 18 is detachable and can be removed from the forming mold 4. It does not require external connection to a negative pressure pipeline and can perform negative pressure adsorption work independently, ensuring the normal operation of the negative pressure extraction process.

[0022] The molding die 4 has airflow holes 22 on both sides near the top that communicate with the adsorption holes, and the negative pressure device 18 has a driver 13 on its outer side for driving the negative pressure device 18 to operate. During operation, the negative pressure device 18 generates negative pressure, which is transmitted to the internal mold groove 7 through the airflow hole 22 to form negative pressure, ensuring that the raw material adheres to the mold groove 7. The driver 13 can remotely control the operation of the negative pressure device 18 without contact, and can control the operation of the negative pressure device 18 by means of magnetic attraction, so that the negative pressure device 18 can generate negative pressure directly on the molding mold 4 without electricity or negative pressure pipes, so that the molding process can proceed smoothly and reduce the problem of negative pressure leakage when using pipes or other connecting equipment.

[0023] The outer side of the molding mold 4 is provided with a connecting arm 8 that moves with the molding mold 4. A series frame 12 is fixedly connected to the top of the connecting arm 8. The series frame 12 is connected to multiple drivers 13. Both sides of the molding mold 4 are fixedly connected with connecting seats 19 that are adapted to the connecting arm 8. During operation, when the upper and lower molding dies 4 merge to perform molding, the driver 13 is located on the outside of the molding die 4 and controls the negative pressure device 18 to generate negative pressure. After the two molding dies 4 separate, the driver 13 stops driving. The connecting arm 8 can be inserted into the connecting seat 19 to ensure that the connecting arm 8 is always located on the outside of the connecting seat 19, thereby ensuring that the driver 13 is always aligned with the negative pressure device 18.

[0024] The negative pressure device 18 has multiple squeezing grooves 33 inside, and a rotating disk 31 is rotatably connected to the squeezing groove 33. A lever 34 is slidably engaged in the middle of the rotating disk 31. The negative pressure device 18 has an airflow groove 30 inside that connects the outside to the squeezing groove 33. During operation, the rotating disk 31 rotates, and the top of the rotating disk 31 is sealed to the extrusion groove 33. When rotating, the paddle 34 slides due to the extrusion groove 33, thereby generating air pressure changes inside the extrusion groove 33, thus forming a constant airflow in the airflow groove 30 and generating negative pressure on the surface of the mold groove 7.

[0025] The outer surface of the rotating disk 31 is composed of a plurality of magnetic blocks 35 arranged together. The driver 13 includes a drive motor 26 fixedly connected to the series frame 12. The output end of the drive motor 26 is fixedly connected to a magnetic coupling disk 28. The magnetic coupling disk 28 and the rotating disk 31 are arranged concentrically and parallel. During operation, the drive motor 26 drives the magnetic coupling disk 28 to rotate, and under the magnetic attraction, the magnetic block 35 and the rotating disk 31 rotate, thus realizing the negative pressure pumping operation of the negative pressure pump 18.

[0026] The surface of the negative pressure device 18 is provided with an adapter groove 29, the end of the series frame 12 is fixedly connected with an adapter post 25, and the outside of the drive motor 26 is fixedly connected with a protective cylinder 27, the end of the protective cylinder 27 extending beyond the end face of the magnetic coupling disk 28. During operation, in order to ensure the installation position of the connecting arm 8, after the connecting arm 8 is installed in place, the adapter post 25 should be pressed against the adapter groove 29. This state ensures accurate positioning during connection and reduces the vibration problem when the connecting arm 8 moves. When the adapter post 25 and the adapter groove 29 are pressed against each other, the protective cylinder 27 will be pressed against the outside of the negative pressure device 18, ensuring the alignment and connection between the magnetic coupling disk 28 and the rotating disk 31.

[0027] The end of the connecting arm 8 is fixed with a plurality of insert rods 9, and a plurality of binding holes 10 are provided through the surface of the insert rods 9. The surface of the connecting seat 19 is provided with a plurality of insertion holes that are adapted to the insert rods 9, and the side of the connecting seat 19 is connected with a locking bolt 24 that is adapted to the binding holes 10. During operation, in order to ensure the connection stability of the connecting arm 8, the connecting rod 9 is connected to the binding hole 10, and then the locking bolt 24 is used for insertion and fixation to ensure that the connecting arm 8 is firmly fixed to the connecting seat 19.

[0028] The surface of the conveyor 3 is provided with two energized grooves 6, and the bottom of the connecting seat 19 is rotatably connected to a pantograph 23, which is located above the energized grooves 6. During operation, to achieve electric drive of the drive motor 26, an electrified groove 6 is opened on the surface of the conveyor 3. When the forming molds 4 are combined, the pantograph 23 will be in contact with the electrified groove 6 to complete the electrification, allowing the drive motor 26 to work. When the forming mold 4 moves to the rear, the pantograph 23 is no longer energized, the drive motor 26 is turned off, and the negative pressure will also stop. With this setting, the energization effect of the drive motor 26 is achieved, and the function of controlling the start and stop of negative pressure is also realized. At the same time, the detachable setting of the connecting arm 8 makes the forming mold 4 more independent. Even if the connecting arm 8 and the negative pressure device 18 are removed, it can work independently, which increases its applicability and makes it convenient to disassemble and replace parts when they fail. Alternatively, the negative pressure device 18 can be converted into a direct electric drive, removing the connecting arm 8 and the driver 13, and integrating the negative pressure device 18 and the pantograph 23 onto the forming mold 4. This method has a lower cost, but reduces maintenance and applicability.

[0029] Both sides of the molding mold 4 are fixed with reinforcing ropes 17. A through hole 21 is opened on the outer side of the connecting arm 8 near the top. A fixing lock 11 for fixing the reinforcing ropes 17 is installed on the outer side of the connecting arm 8 near the top. During operation, the stability of the connecting arm 8 can be improved by passing the reinforcing rope 17 through the through hole 21 and then securing it with the fixing lock 11, thus ensuring smooth power transmission.

[0030] The bottom of the forming mold 4 is fixedly connected to a transmission seat 20 connected to the conveyor 3. The two sides of the conveyor 3 are detachable structures. The top of the forming mold 4 is provided with multiple closed slots 15. A closing block 16 is inserted into several of the closed slots 15. A sealing gasket 14 is fixedly connected to both sides of the forming mold 4. During operation, after the two molding dies 4 are combined, the closing groove 15 and the closing block 16 are connected to each other to complete the mold closing. The airflow between the two can be connected through the closing block 16 and the closing groove 15. In this way, only the connecting arm 8 and the driver 13 need to be set on the conveyor 3 below to complete the pneumatic conveying work. The sealing gasket 14 can ensure the connection and sealing of adjacent molding dies 4.

[0031] During operation, the upper forming unit 2 and the lower forming unit 1 are arranged vertically, allowing multiple forming dies 4 to merge between them. When the multiple forming dies 4 are in a horizontal state, there are no gaps between adjacent forming dies 4; gaps only occur when they are flipped over. Hydraulic lifting modules need to be installed on both sides of the upper forming unit 2 to control its lifting and lowering. During the forming process, the upper forming unit 2 is lowered, and the upper and lower forming dies 4 merge to form a ring structure. The outlet end of the extruder is positioned at the end of the equipment, allowing the extruded material to enter this ring structure. Through the rotation of the two conveyors 3, the two sets of forming dies 4 move in the same direction. After the extruded material is formed in the first ring structure, as the ring structure moves backward, combined with the continuous extrusion of the extruder, a non-fractured corrugated pipe is formed. The completed corrugated pipe is continuously discharged from the rear end of the equipment. The separated forming dies 4 allow the corrugated pipe to be easily demolded, thus completing the forming process. To produce a double-walled corrugated pipe, the center of the extruder's end needs to continuously eject airflow, causing the inner wall of the corrugated pipe being formed to be subjected to uniform outward extrusion. Due to the presence of the die groove 7, the outer wall of the corrugated pipe forms the same corrugated groove as the die groove 7. As the corrugated pipe continues to form, the internal air pressure can be better concentrated at the forming position at the end, ensuring the quality of the corrugated pipe formation. Under the internal extrusion action, the raw material is squeezed into the die groove 7. To ensure the extrusion effect, a negative pressure device 18 is used to discharge the air pressure between the die groove 7 and the raw material, forming a negative pressure. This not only ensures the tight fit between the raw material and the die groove 7, but also allows the raw material to diffuse evenly outward. Through the ratio of internal air pressure and external negative pressure, a corrugated pipe that perfectly fits the forming mold 4 is produced, further improving the quality of the finished product. At the same time, the negative pressure device 18 is detachable and can be removed from the forming mold 4. It does not require external connection to a negative pressure pipeline and can perform negative pressure adsorption work independently, ensuring the normal operation of the negative pressure extraction process.

[0032] When the negative pressure device 18 is working, it generates negative pressure. The negative pressure is transmitted to the internal mold groove 7 through the air flow hole 22 to form negative pressure, ensuring that the raw material adheres to the mold groove 7. The driver 13 can remotely control the operation of the negative pressure device 18 without contact. The operation of the negative pressure device 18 can be controlled by magnetic attraction or other methods. In this way, the negative pressure device 18 can generate negative pressure directly on the molding mold 4 without electricity or negative pressure pipes, so that the molding process can proceed smoothly and reduce the problem of negative pressure leakage when using pipes or other connecting equipment.

[0033] When the upper and lower molding dies 4 are combined to perform molding, the driver 13 is located outside the molding die 4 and controls the negative pressure device 18 to generate negative pressure. After the two molding dies 4 are separated, the driver 13 stops driving. The connecting arm 8 can be inserted into the connecting seat 19 to ensure that the connecting arm 8 is always located outside the connecting seat 19, thereby ensuring that the driver 13 is always aligned with the negative pressure device 18.

[0034] The rotating disk 31 is rotated, and the top of the rotating disk 31 is sealed to the extrusion groove 33. When rotating, the paddle 34 will slide due to the extrusion groove 33, thereby generating air pressure change inside the extrusion groove 33, thus forming a constant airflow in the airflow groove 30 and generating negative pressure on the surface of the mold groove 7.

[0035] By driving the magnetic coupling disk 28 to rotate through the drive motor 26, the magnetic block 35 and the rotating disk 31 will rotate under the magnetic attraction, thus realizing the negative pressure pumping operation of the negative pressure pump 18.

[0036] To ensure the correct installation position of the connecting arm 8, the adapter pin 25 should be pressed against the adapter groove 29 after the connecting arm 8 is installed. This ensures accurate positioning during connection and reduces vibration during the movement of the connecting arm 8. When the adapter pin 25 and the adapter groove 29 are pressed together, the protective cylinder 27 will press against the outside of the negative pressure device 18, ensuring the alignment and connection between the magnetic coupling disk 28 and the rotating disk 31.

[0037] To ensure the connection stability of the connecting arm 8, the connecting rod 9 is connected to the binding hole 10, and then the locking bolt 24 is used for insertion and fixation to ensure that the connecting arm 8 is firmly fixed to the connecting seat 19.

[0038] To achieve electric drive of the drive motor 26, an electrified groove 6 is opened on the surface of the conveyor 3. When the forming molds 4 are combined, the pantograph 23 will be in contact with the electrified groove 6 to complete the electrification, allowing the drive motor 26 to work. When the forming mold 4 moves to the rear, the pantograph 23 is no longer energized, the drive motor 26 is turned off, and the negative pressure will also stop. This setting completes the electrification effect of the drive motor 26 and also realizes the function of controlling the start and stop of negative pressure. At the same time, the detachable setting of the connecting arm 8 makes the forming mold 4 more independent. Even if the connecting arm 8 and the negative pressure device 18 are removed, it can work independently, increasing its applicability and making it convenient to disassemble and replace parts in case of failure. Alternatively, the negative pressure device 18 can be converted to direct electric drive, removing the connecting arm 8 and the driver 13, and integrating the negative pressure device 18 and the pantograph 23 onto the forming mold 4. This method has a lower cost, but reduces maintenance and applicability.

[0039] By passing the reinforcing rope 17 through the through hole 21 and then securing it with the fixing lock 11, the stability of the connecting arm 8 can be improved, ensuring smooth power transmission.

[0040] After the two molding dies 4 are combined, the closing groove 15 and the closing block 16 are connected to each other to complete the mold closing. The airflow between the two can be connected through the closing block 16 and the closing groove 15. In this way, only the connecting arm 8 and the driver 13 need to be set on the conveyor 3 below to complete the pneumatic conveying work. The sealing gasket 14 can ensure the connection and sealing of adjacent molding dies 4.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An extrusion molding apparatus for producing HDPE double-wall corrugated pipes, characterized in that: The device includes an upper forming device and a lower forming device. Both the upper forming device and the lower forming device include a conveyor and multiple forming molds. The surface of the conveyor is provided with a limiting groove. The bottom of the forming mold is slidably engaged in the limiting groove and connected to the conveying end of the conveyor. The top of the forming mold is formed into a semi-circular ring. The inner ring of the forming mold is provided with a mold groove. Negative pressure devices are provided on both sides of the forming mold. Multiple suction holes communicating with the negative pressure devices are provided in the mold groove.

2. The extrusion molding apparatus for producing HDPE double-wall corrugated pipes according to claim 1, characterized in that: The molding die has airflow holes on both sides near the top that communicate with the adsorption holes, and the negative pressure device has a driver on the outside for driving the negative pressure device to operate.

3. The extrusion molding apparatus for producing HDPE double-wall corrugated pipes according to claim 2, characterized in that: The outer side of the molding die is provided with a connecting arm that moves with the molding die. A series frame is fixed to the top of the connecting arm. The series frame is connected to multiple drivers. Connecting seats adapted to the connecting arm are fixed to both sides of the molding die.

4. The extrusion molding apparatus for producing HDPE double-wall corrugated pipes according to claim 3, characterized in that: The negative pressure device has multiple squeezing grooves inside, and a rotating disk is rotatably connected to each squeezing groove. A lever is slidably engaged in the middle of the rotating disk. The negative pressure device also has an airflow groove inside that connects the outside world to the squeezing grooves.

5. The extrusion molding apparatus for producing HDPE double-wall corrugated pipes according to claim 4, characterized in that: The outer surface of the rotating disk is composed of multiple magnetic blocks arranged in a row. The driver includes a drive motor fixedly connected to the series frame. The output end of the drive motor is fixedly connected to a magnetic coupling disk. The magnetic coupling disk and the rotating disk are arranged concentrically and parallel to each other.

6. The extrusion molding apparatus for producing HDPE double-wall corrugated pipes according to claim 5, characterized in that: The surface of the negative pressure device is provided with an adapter groove, the end of the series frame is fixedly connected with an adapter post, and the outside of the drive motor is fixedly connected with a protective cylinder, the end of which extends beyond the end face of the magnetic coupling disk.

7. The extrusion molding apparatus for producing HDPE double-wall corrugated pipes according to claim 6, characterized in that: The end of the connecting arm is fixed with multiple insertion rods, and multiple binding holes are opened through the surface of the insertion rods. The surface of the connecting seat is opened with multiple insertion holes that are adapted to the insertion rods, and the side of the connecting seat is connected with a locking bolt that is adapted to the binding holes.

8. The extrusion molding apparatus for producing HDPE double-wall corrugated pipes according to claim 7, characterized in that: The surface of the conveyor is provided with two energized grooves, and a pantograph is rotatably connected to the bottom of the connecting seat, with the pantograph located above the energized grooves.

9. The extrusion molding apparatus for producing HDPE double-wall corrugated pipes according to claim 8, characterized in that: The molding die is fixed with reinforcing ropes on both sides. A through hole is opened on the outer side of the connecting arm near the top. A fixing lock for fixing the reinforcing ropes is installed on the outer side of the connecting arm near the top.

10. An extrusion molding apparatus for producing HDPE double-wall corrugated pipes according to claim 9, characterized in that: The bottom of the forming mold is fixedly connected to a transmission seat that is connected to a conveyor. The two sides of the conveyor are detachable structures. The top of the forming mold has multiple closed slots, and a closing block is inserted into several of the closed slots. Sealing gaskets are fixedly connected to both sides of the forming mold.

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