Forming equipment for producing HPVC double-wall corrugated pipes and forming method thereof

Abstract

The application relates to the technical field of bellows production equipment, in particular to a forming equipment for HPVC double-wall bellows production and a forming method thereof; the forming equipment comprises an extruder, a controller and a setting machine; two groups of setting dies are arranged on the setting machine; the setting dies are composed of a No.1 die, a No.2 die and a No.3 die; the No.1 die, the No.2 die and the No.3 die are sequentially spliced, and the No.1 die, the No.2 die and the No.3 die are connected through a connecting mechanism; the No.1 die, the No.2 die and the No.3 die are connected into the setting die through the connecting mechanism; when the ring structure is extruded on the outer wall of HPVC double-wall bellows of different specifications, the No.1 die or the No.2 die is disassembled, the setting die can correspond to the outer wall of the HPVC double-wall bellows, so that one set of die corresponds to HPVC double-wall bellows of different specifications, and the use value of the die is increased.

Description

Technical Field

[0001] This invention relates to the field of corrugated pipe production equipment technology, and in particular to a molding equipment and molding method for producing HPVC double-wall corrugated pipes. Background Technology

[0002] HPVC double-wall corrugated pipe is a new type of lightweight pipe with an annular outer wall and a smooth inner wall. The annular structure of its outer wall greatly increases the ring stiffness of HPVC double-wall corrugated pipe, and it is widely used in water supply, drainage, ventilation and irrigation.

[0003] During the production of HPVC double-wall corrugated pipe, the raw material of HPVC double-wall corrugated pipe is extruded from the extruder and then shaped by the mold, forming a ring structure on the outer wall of HPVC double-wall corrugated pipe.

[0004] HPVC double-wall corrugated pipes come in different specifications and models, with different pipe diameters. Therefore, different specifications of molds are needed to extrude the ring structure onto the outer wall of the HPVC double-wall corrugated pipe. If the specifications of the HPVC double-wall corrugated pipe production equipment are changed, the molds of the HPVC double-wall corrugated pipe forming equipment need to be changed. One set of molds corresponds to only one specification of HPVC double-wall corrugated pipe forming equipment molds, which reduces the utilization value of the molds.

[0005] Therefore, we propose a molding equipment and molding method for producing HPVC double-wall corrugated pipes. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the present invention provides a molding equipment and molding method for producing HPVC double-wall corrugated pipes, which overcomes the shortcomings of the prior art and aims to solve the problems in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a molding device for producing HPVC double-wall corrugated pipes, comprising...

[0008] Extruder;

[0009] Controller;

[0010] A shaping machine; the shaping machine is equipped with two sets of shaping molds; the shaping molds are semi-circular; both sets of shaping molds are distributed in a U-shape, and the shaping molds in close proximity to each other can be joined together to form a ring;

[0011] The shaping mold consists of mold number one, mold number two, and mold number three; mold number one, mold number two, and mold number three are sequentially assembled and connected by a connecting mechanism; the connecting mechanism includes a fixing block and connects mold number one, mold number two, and mold number three by inserting the fixing block into mold number two and mold number three.

[0012] Preferably, the connecting mechanism includes a rotating rod, a fixing block, and a sealing block; rotating grooves are provided on the end faces of both ends of the first mold and the second mold, and the first mold has a first groove at both ends; the second mold and the third mold have a second groove at both ends; the second groove passes through the second mold and the third mold; the fixing block is slidably connected to the first groove and the second groove on the first mold and the second mold, respectively; the rotating rod is threadedly connected to the rotating groove, and when the rotating rod rotates and presses the fixing block downward, the fixing block slides toward the corresponding first groove or second groove; the sealing block is slidably connected in the second groove; a return spring is fixedly connected in the second groove; the other end of the return spring is fixedly connected to the sealing block.

[0013] The connecting mechanism allows molds No. 1, No. 2, and No. 3 to form a shaping mold. When extruding ring structures onto the outer wall of HPVC double-wall corrugated pipes of different specifications, mold No. 1 or No. 2 can be removed so that the shaping mold can correspond to the outer wall of the HPVC double-wall corrugated pipe. Thus, one set of molds can correspond to different specifications of HPVC double-wall corrugated pipes, increasing the value of the mold.

[0014] Preferably, the two sets of shaping molds are provided with a mold storage mechanism on both sides; the mold storage mechanism includes a storage compartment, a fixed base, a loading and unloading block and a second motor; the storage compartment is located on both sides of the shaping machine, and two first motors are fixedly connected in the storage compartment; the output ends of the two first motors are fixedly connected with lead screws; and the two lead screws are threaded with top blocks;

[0015] The two fixed seats are fixedly connected to both sides of the shaping machine and located at one end of the storage compartment opening. A No. 3 motor is fixedly connected to the fixed seats. The loading and unloading block is slidably connected to the fixed seats. A lead screw that is threadedly engaged with the loading and unloading block is fixedly connected to the output end of the No. 3 motor.

[0016] A second electric push rod is fixedly connected to the loading / unloading block, and the loading / unloading block has a concave cross-sectional shape. The second electric push rod is located within the concave area, and a third electric push rod is fixedly connected to the output end of the second electric push rod. The bottom of the third electric push rod is slidably connected to the loading / unloading block, and the third electric push rod is perpendicular to the second electric push rod. The output end of the third electric push rod is fixedly connected to the second motor. The output end of the second motor is square. A square groove is provided at the end of the rotating rod. An electromagnet is embedded in the loading / unloading block. A fourth electric push rod is fixedly connected to the fixed base. A push block is fixedly connected to the output end of the fourth electric push rod.

[0017] By setting up mold storage mechanisms on both sides of the forming machine to replace workers, the No. 1 and No. 2 molds on the forming machine are automatically disassembled and installed, thus achieving automation. The originally tedious, labor-intensive process of disassembling and installing molds is replaced by machines, reducing the labor intensity of workers.

[0018] Preferably, connecting springs are uniformly fixed inside the storage compartment; an arc-shaped plate is fixed to the other end of the connecting spring; the length of the arc-shaped plate is the same as the length of the first mold.

[0019] Preferably, a buffer is fixedly connected to the side of the top block near the fixed base. In this embodiment, the buffer is made of rubber.

[0020] Preferably, the surface of the arc-shaped plate that contacts the first mold or the second mold is rotatably connected with ball bearings.

[0021] Preferably, the loading and unloading block is inclined on the side near the storage compartment, and the opening of the storage compartment is chamfered.

[0022] A molding method for producing HPVC double-wall corrugated pipes, applicable to the aforementioned molding equipment for producing HPVC double-wall corrugated pipes, comprises the following steps:

[0023] S1, HPVC double-wall corrugated pipe is extruded from the extruder and moves forward, entering between two sets of shaping molds on the shaping machine. The motor on the shaping machine drives two sets of conveyor belts to rotate the two sets of shaping molds, resulting in a ring structure in the HPVC double-wall corrugated pipe.

[0024] S2. The No. 2 motor on the loading and unloading block rotates the rotating rod, causing the fixed block to retract into the corresponding No. 1 or No. 2 mold. At the same time, the electromagnet attracts the corresponding No. 1 or No. 2 mold, and the No. 4 electric push rod pushes the disassembled No. 1 or No. 2 mold into the storage chamber. Thus, the shaping mold on the shaping machine changes the specifications of the HPVC double wall corrugated pipe, and can extrude a ring structure on the outer wall of HPVC double wall corrugated pipes of different specifications.

[0025] S3. The No. 1 motor drives the top block to push the No. 1 mold or the No. 2 mold in the storage compartment. After the No. 1 mold or the No. 2 mold is attracted by the electromagnet, the loading and unloading block takes the No. 1 mold or the No. 2 mold to contact the shaping mold on the shaping machine, and then loads the No. 1 mold or the No. 2 mold onto the shaping mold on the shaping machine.

[0026] The beneficial effects of this invention are:

[0027] 1. The present invention uses a connecting mechanism to form a shaping mold consisting of mold No. 1, mold No. 2, and mold No. 3. When extruding ring structures onto the outer wall of HPVC double-wall corrugated pipes of different specifications, mold No. 1 or mold No. 2 can be removed so that the shaping mold can correspond to the outer wall of the HPVC double-wall corrugated pipe. Thus, one set of molds can be used for different specifications of HPVC double-wall corrugated pipes, increasing the utility value of the mold.

[0028] 2. This invention replaces manual laborers by setting up mold storage mechanisms on both sides of the forming machine to automatically disassemble and install the No. 1 and No. 2 molds on the forming machine, thereby achieving automation. The original tedious and labor-intensive process of disassembling and installing molds is replaced by machines, reducing the labor intensity of the workers. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention;

[0030] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0031] Figure 3 This is a partial sectional view of the shaping mold in this invention;

[0032] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0033] Figure 5 This is a schematic diagram of the loading and unloading block, the second electric push rod, the third electric push rod, the fourth electric push rod, and the second motor in this invention.

[0034] Figure 6 for Figure 5 Enlarged view of point C in the middle;

[0035] Figure 7 This is a partial cross-sectional view of the storage compartment in this invention;

[0036] Figure 8 This is a schematic diagram of the structure connecting the spring, the arc plate, and the ball bearing in this invention.

[0037] In the diagram: 1. Extruder; 2. Shaping machine; 3. Shaping mold; 31. Mold No. 1; 32. Mold No. 2; 33. Mold No. 3; 4. Connecting mechanism; 41. Fixing block; 42. Rotating rod; 43. Sealing block; 44. Rotating groove; 45. Groove No. 1; 46. Groove No. 2; 47. Return spring; 5. Mold storage mechanism; 51. Storage compartment; 52. Fixing seat; 53. Loading / unloading block; 54. Motor No. 2; 55. Motor No. 1; 56. Lead screw; 57. Top block; 58. Motor No. 3; 59. Electric push rod No. 2; 6. Electric push rod No. 3; 61. Electromagnet; 62. Electric push rod No. 4; 63. Push block; 7. Connecting spring; 71. Arc plate; 72. Buffer; 73. Ball bearing. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0039] Refer to the instruction manual appendix Figure 1 A molding equipment for producing HPVC double-wall corrugated pipes, comprising:

[0040] Extruder 1;

[0041] Controller;

[0042] The shaping machine 2 is equipped with two sets of shaping molds 3; the shaping molds 3 are semi-circular rings; both sets of shaping molds 3 are distributed in a U-shape, and the shaping molds 3 that are close to each other can be joined together to form a ring;

[0043] Refer to the instruction manual appendix Figure 3 The shaping mold 3 consists of mold 1 31, mold 2 32 and mold 33; mold 1 31, mold 2 32 and mold 33 are sequentially assembled and connected by a connecting mechanism 4; the connecting mechanism 4 includes a fixing block 41 and connects mold 1 31, mold 2 32 and mold 33 by inserting the fixing block 41 into mold 2 32 and mold 33.

[0044] Refer to the instruction manual appendix Figure 4In this embodiment, the connecting mechanism 4 includes a rotating rod 42, a fixing block 41, and a sealing block 43. Rotating grooves 44 are provided on the end faces of both ends of mold 1 31 and mold 2 32. Mold 1 31 has a first groove 45 at both ends. Mold 2 32 and mold 33 have second grooves 46 at both ends. The second groove 46 penetrates mold 2 32 and mold 33. The fixing block 41 is slidably connected to the first groove 45 and the second groove 46 on mold 1 31 and mold 2 32, respectively. The rotating rod 42 is threadedly connected to the rotating groove 44. When the rotating rod 42 rotates and presses down on the fixing block 41, the fixing block 41 slides towards the corresponding first groove 45 or second groove 46. The sealing block 43 is slidably connected to the second groove 46. A return spring 47 is fixedly connected to the second groove 46. The other end of the return spring 47 is fixedly connected to the sealing block 43.

[0045] In the initial state, mold 31, mold 32 and mold 33 form a shaping mold 3. The fixing block 41 on mold 32 is inserted into the second groove 46 on mold 33, and the sealing block 43 on mold 33 is pushed into the second groove 46. The fixing block 41 on mold 31 is inserted into the second groove 46 on mold 32, and the sealing block 43 on mold 32 is pushed into the second groove 46.

[0046] In operation, the controller controls the extruder 1 and the shaping machine 2 to start working. The HPVC double-wall corrugated pipe is extruded from the extruder 1. The extruded HPVC double-wall corrugated pipe moves forward and enters between two sets of shaping dies 3 on the shaping machine 2. The motor on the shaping machine 2 drives two sets of conveyor belts to rotate the two sets of shaping dies 3. The two shaping dies 3 closest to the extruder 1 come into contact with each other, forming a ring and clamping the HPVC double-wall corrugated pipe. At this time, the outer wall of the HPVC double-wall corrugated pipe comes into contact with the inner wall of the shaping die 3, so that the outer wall of the HPVC double-wall corrugated pipe is squeezed out into a ring structure by the shaping die 3. The shaping die 3 that squeezes the HPVC double-wall corrugated pipe moves forward together with the HPVC double-wall corrugated pipe. When the shaping die 3 moves to the side of the conveyor belt away from the extruder 1, the two shaping dies 3 that clamp the HPVC double-wall corrugated pipe separate from each other, so that a ring structure is extruded from the HPVC double-wall corrugated pipe.

[0047] When it is necessary to change the specifications of the shaping mold 3 to adapt to the extruder 1 to extrude HPVC double-wall corrugated pipes of different diameters, the operator twists the connecting rod on the first mold 31, so that the connecting rod moves upward through the threaded engagement with the rotating groove 44. At the same time, the return spring 47 pushes the sealing block 43, pushing the fixing block 41 into the first groove 45 on the first mold 31 until the fixing block 41 retracts into the first groove 45. At this time, the sealing block 43 blocks the opening of the second groove 46, thereby preventing the HPVC double-wall corrugated pipe from entering the second groove 46 when the second mold 32 or the third mold 33 extrudes the HPVC double-wall corrugated pipe, thus preventing the HPVC double-wall corrugated pipe from forming a bulge.

[0048] After retracting the two fixing blocks 41 on mold 31 into slot 45, the worker moves mold 31 to detach it from mold 32, exposing its inner wall. The worker then uses a controller to drive a conveyor belt to rotate intermittently, moving the shaping mold 3 forward a short distance each time. This brings the shaping mold 3 (without removing mold 31) to the worker's view until both sets of shaping molds have had their molds 31 completely removed, thus completing the change in mold 3 specifications. Similarly, the worker can rotate the rotating rod 4 on mold 32. 2. This causes the fixing block 41 to retract into the second groove 46 on the second mold 32, completing the disassembly of the second mold 32 and exposing the inner wall of the third mold 33. When installing the second mold 32 onto the third mold 33, or installing the first mold 31 onto the second mold 32, align the second mold 32 with the inner wall of the third mold 33, and then rotate the rotating rod 42 in the opposite direction. This causes the rotating rod 42 to move downward, pressing the inclined surface of the fixing block 41. As a result, the fixing block 41 moves toward the second groove 46 and pushes the sealing block 43 into the second groove 46, thus completing the fixing. Similarly, the first mold 31 is fixed onto the second mold 32 in the same way.

[0049] The present invention uses a connecting mechanism 4 to form a shaping mold 3 consisting of mold 31, mold 32, and mold 33. When extruding ring structures onto the outer wall of HPVC double-wall corrugated pipes of different specifications, mold 31 or mold 32 can be removed so that the shaping mold 3 can correspond to the outer wall of the HPVC double-wall corrugated pipe. Thus, one set of molds can be used for different specifications of HPVC double-wall corrugated pipes, increasing the utility value of the mold. Example

[0050] Compared with Example 1, the difference in this example is that...

[0051] Refer to the instruction manual appendix Figure 1 , 5In this embodiment, two sets of shaping molds are provided with mold storage mechanisms 5 on both sides; the mold storage mechanism 5 includes a storage compartment 51, a fixed base 52, a loading and unloading block 53 and a second motor 54; the storage compartment 51 is located on both sides of the shaping machine 2, and two first motors 55 are fixedly connected inside the storage compartment 51; the output ends of the two first motors 55 are fixedly connected with lead screws 56; both lead screws 56 are threadedly fitted with top blocks 57;

[0052] Two fixed seats 52 are fixedly connected to both sides of the shaping machine 2 and located at one end of the opening of the storage compartment 51. A No. 3 motor 58 is fixedly connected to the fixed seat 52. The loading and unloading block 53 is slidably connected to the fixed seat 52. The output end of the No. 3 motor 58 is fixedly connected to a lead screw 56 that is threadedly engaged with the loading and unloading block 53.

[0053] Refer to the instruction manual appendix Figure 5 A second electric push rod 59 is fixedly connected to the loading / unloading block 53. The cross-sectional shape of the loading / unloading block 53 is concave. The second electric push rod 59 is located in the concave area. The output end of the second electric push rod 59 is fixedly connected to a third electric push rod 6. The bottom of the third electric push rod 6 is slidably connected to the loading / unloading block 53. The third electric push rod 6 is perpendicular to the second electric push rod 59. The output end of the third electric push rod 6 is fixedly connected to a second motor 54. The output end of the second motor 54 is square. A square groove is provided at the end of the rotating rod 42. An electromagnet 61 is embedded in the loading / unloading block 53. A fourth electric push rod 62 is fixedly connected to the fixed base 52. A push block 63 is fixedly connected to the output end of the fourth electric push rod 62.

[0054] In this embodiment, a mold storage mechanism 5 is used to replace the worker in removing mold No. 1 31 and mold No. 2 32 and installing mold No. 1 31 and mold No. 2 32. The specific process is as follows:

[0055] The controller controls the output of motor 58 to rotate, which in turn causes motor 58 to move loading / unloading block 53 via lead screw 56. Loading / unloading block 53, carrying electric push rod 6 and motor 54, moves closer to the corresponding forming mold 3. As electric push rod 6 and motor 54 approach the forming mold 3, the controller further controls electric push rod 59 to move, adjusting the position of motor 54. Since the vertical position of rotating rod 42 on mold 31 and mold 32 is fixed, moving the output of electric push rod 6 with motor 54 a corresponding distance will adjust the output of motor 54. Align the end with the corresponding rotating rod 42; after the output end of the second motor 54 enters the groove on the rotating rod 42, the loading / unloading block 53 contacts the two ends of mold 31, mold 32, and mold 33. The controller controls the second motor 54 to rotate while simultaneously supplying current to the electromagnet 61, thereby driving the rotating rod 42 to rotate, replacing manual rotation of the rotating rod 42. The electromagnet 61 generates magnetic force, attracting mold 31, mold 32, and mold 33. After the second motor 54 rotates the rotating rod 42, the controller controls the third electric push rod 6 to move the second motor 54 away from the fixed shape. The mold 3 moves in a certain direction, causing the output end of motor 54 to disengage from the rotating rod 42. Then, the controller controls the output end of motor 58 to move the loading / unloading block 53 away from the forming mold 3. As the loading / unloading block 53 moves, it also moves mold 31 along with it. Molds 32 and 33 remain fixed together by the fixing block 41. Next, the controller controls the output end of electric push rod 62 to push push block 63, causing push block 63 to contact mold 31 attached to loading / unloading block 53. Under the push of push block 63, sliding occurs between mold 31 and loading / unloading block 53, thus allowing mold 31 to... Pushed by push block 63, it enters the storage compartment 51. Then, the output end of the fourth electric push rod 62 takes push block 63 back to its original position. Then, the controller controls the motor to drive the conveyor belt to rotate intermittently. Each time it rotates, it moves the shaping mold 3 forward a small distance, so that the shaping mold 3 that has not been disassembled rotates to the front of the loading and unloading block 53. The loading and unloading block 53, the third electric push rod 6, and the second motor 54 unload the first mold 31 on the shaping mold 3 again, until the first mold 31 on both sets of shaping molds 3 is completely unloaded and stored in the storage compartment 51. The first molds 31 in the storage compartment 51 are in contact with each other and arranged in a row.

[0056] The storage compartment 51 is equipped with two cavities and two sets of No. 1 motors 55, lead screws 56 and top blocks 57. The two cavities respectively store No. 1 mold 31 and No. 2 mold 32.

[0057] When it is necessary to install the No. 1 mold 31 in the storage compartment 51 onto the No. 2 mold 32 on the shaping machine 2, the controller controls the No. 1 motor 55 to rotate, which in turn drives the lead screw 56 to rotate. When the lead screw 56 rotates, the top block 57 pushes a row of No. 1 molds 31 towards the loading and unloading block 53, so that the outermost No. 1 mold 31 in the storage compartment 51 comes into contact with the loading and unloading block 53. At this time, part of the No. 1 mold 31 is attracted by the electromagnet 61, and the other part is located in the storage compartment 51. As the top block 57 continues to push, the No. 1 mold 31 slides relative to the loading and unloading block 53 until the No. 1 mold 31 is completely attracted by the loading and unloading block 53. Then the controller controls the No. 3 motor 58 to push the loading and unloading block 53, so that the loading and unloading block 53 carries the No. 1 mold 31 towards the corresponding shaping mold 3, until the No. 1 mold 31 is attracted by the loading and unloading block 53. Mold 31 fits against the inner wall of the corresponding mold 32 on the shaping mold 3. Then, the controller controls the third electric push rod 6 to move the second motor 54 towards the direction of the rotating rod 42, so that the output end of the second motor 54 enters the groove on the rotating rod 42. The second motor 54 rotates in the opposite direction, so that the fixing block 41 extends out of the first slot 45 and enters the second slot 46 on the second mold 32, thus installing the first mold 31 onto the corresponding shaping mold 3. Then, the output end of the third motor 58 moves backward with the loading and unloading block 53 back to its original position. The motor drives the conveyor belt to move intermittently, and the mold storage mechanism 5 repeats the above actions until all the first molds 31 are installed onto the corresponding shaping molds 3. The second mold 32 is installed onto the shaping machine 2 in the same way in another cavity of the storage chamber 51.

[0058] This invention replaces manual laborers by setting up mold storage mechanisms 5 on both sides of the shaping machine 2 to automatically disassemble and install the first mold 31 and the second mold 32 of the shaping mold 3 on the shaping machine 2, thereby achieving automation. The original tedious and labor-intensive process of disassembling and installing molds is replaced by machines, reducing the labor intensity of the workers.

[0059] Refer to the instruction manual appendix Figure 7 , 8 In this embodiment, connecting springs 7 are uniformly fixed inside the storage compartment 51; an arc-shaped plate 71 is fixed to the other end of the connecting springs 7; the length of the arc-shaped plate 71 is the same as the length of the first mold 31.

[0060] Refer to the instruction manual appendix Figure 7 In this embodiment, a buffer 72 is fixedly connected to the side of the top block 57 near the fixed base 52. In this embodiment, the buffer 72 is made of rubber.

[0061] In this embodiment, a connecting spring 7 and an arc-shaped plate 71 are provided inside the storage compartment 51. When mold 1 31 or mold 2 32 enters the storage compartment 51, the connecting spring 7 is compressed, and the arc-shaped plate 71 pushes mold 1 31 or mold 2 32 under the action of the connecting spring 7, so that the two ends of mold 1 31 or mold 2 32 fit against the side wall of the storage compartment 51. When the loading and unloading block 53 and the second motor 54 directly remove mold 2 32 from mold 3 33, while mold 1 31 is still installed on mold 2 32, and mold 1 31 and mold 2 32 enter the storage compartment 51 together, the degree of compression of the connecting spring 7 increases. At this time, mold 1 31 and mold 2 32 can still be pushed by the corresponding arc-shaped plate 71 and fit against the side wall of the storage compartment 51, thereby increasing the applicability of the present invention.

[0062] In this embodiment, a buffer member 72 is fixedly connected to the top block 57, thereby buffering the top block 57 and the first mold 31 or the second mold 32 when the top block 57 comes into contact with the top block 57, thereby preventing the first mold 31 or the second mold 32 near the top block 57 from accumulating in front of the top block 57 and being damaged.

[0063] Refer to the instruction manual appendix Figure 8 In this embodiment, a ball bearing 73 is rotatably connected to the surface of the arc plate 71 that contacts the first mold 31 or the second mold 32.

[0064] In this embodiment, the loading and unloading block 53 is inclined on the side near the storage compartment 51, and the opening of the storage compartment 51 is chamfered.

[0065] In this embodiment, ball bearings 73 are provided on the arc-shaped plate 71, thereby changing the sliding friction between the original mold 31 or mold 32 and the arc-shaped plate 71 into rolling friction. This reduces the friction between the arc-shaped plate 71 and the outer wall of the mold 31 or mold 32, thus reducing the wear on the outer surface of the mold 31 or mold 32. Consequently, it reduces the adhesion of particles generated by the wear on the outer surface of the mold 31 or mold 32 to the inner surface of the mold 33 when they come into contact with it. This reduces the impact on the outer wall of the HPVC double-wall corrugated pipe when the mold 32 or mold 33 shapes the pipe. The smoothness of the HPVC double-wall corrugated pipe surface improves the surface accuracy of the HPVC double-wall corrugated pipe. In this embodiment, the loading and unloading block 53 is inclined on both sides and the opening of the storage compartment 51 is chamfered. So even if there is a deviation in the position when the first mold 31 or the second mold 32 enters the storage compartment 51, the first mold 31 or the second mold 32 can still enter the storage compartment 51 along the chamfer at the opening of the storage compartment 51. Similarly, if there is a deviation in the position when the first mold 31 or the second mold 32 is adsorbed onto the loading and unloading block 53, the first mold 31 or the second mold 32 can also slide along the inclined surface of the loading and unloading block 53 to the end face close to the third mold 33.

[0066] 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. A molding device for producing HPVC double-wall corrugated pipes, comprising: Extruder (1); Controller; A shaping machine (2); the shaping machine (2) is provided with two sets of shaping molds (3); the shaping molds (3) are semi-circular; the two sets of shaping molds (3) are distributed in a U-shape, and the shaping molds (3) that are close to each other can be assembled into a ring; Its features are: The shaping mold (3) is composed of mold No. 1 (31), mold No. 2 (32) and mold No. 3 (33); mold No. 1 (31), mold No. 2 (32) and mold No. 3 (33) are assembled in sequence, and mold No. 1 (31), mold No. 2 (32) and mold No. 3 (33) are connected by a connecting mechanism (4); the connecting mechanism (4) includes a fixing block (41) and connects mold No. 1 (31), mold No. 2 (32) and mold No. 3 (33) by inserting the fixing block (41) into mold No. 2 (32) and mold No. 3 (33); The connecting mechanism (4) includes a rotating rod (42), a fixing block (41), and a sealing block (43); rotating grooves (44) are provided on the end faces of both ends of the first mold (31) and the second mold (32), and first grooves (45) are provided at both ends of the first mold (31); second grooves (46) are provided at both ends of the second mold (32) and the third mold (33); the second grooves (46) penetrate the second mold (32) and the third mold (33). The fixing block (41) is slidably connected to the first groove (45) and the second groove (46) on the first mold (31) and the second mold (32), respectively; the rotating rod (42) is threadedly connected to the rotating groove (44); the sealing block (43) is slidably connected to the second groove (46); a return spring (47) is fixedly connected in the second groove (46); the other end of the return spring (47) is fixedly connected to the sealing block (43); The two sets of shaping molds (3) are provided with mold storage mechanisms (5) on both sides; the mold storage mechanism (5) includes a storage compartment (51), a fixed base (52), a loading and unloading block (53) and a second motor (54); the storage compartment (51) is located on both sides of the shaping machine (2), and two first motors (55) are fixedly connected inside the storage compartment (51); the output ends of the two first motors (55) are fixedly connected with lead screws (56); the two lead screws (56) are threadedly fitted with top blocks (57); Two fixed seats (52) are fixedly connected to both sides of the shaping machine (2), and a No. 3 motor (58) is fixedly connected to the fixed seat (52); the loading and unloading block (53) is slidably connected to the fixed seat (52); the output end of the No. 3 motor (58) is fixedly connected to a lead screw (56) that is threadedly engaged with the loading and unloading block (53). A second electric push rod (59) is fixedly connected to the loading / unloading block (53), and a third electric push rod (6) is fixedly connected to the output end of the second electric push rod (59); the bottom of the third electric push rod (6) is slidably connected to the loading / unloading block (53), and the output end of the third electric push rod (6) is fixedly connected to the second motor (54); the output end of the second motor (54) is square; a square groove is provided at the end of the rotating rod (42); an electromagnet (61) is embedded in the loading / unloading block (53); a fourth electric push rod (62) is fixedly connected to the fixed base (52); and a push block (63) is fixedly connected to the output end of the fourth electric push rod (62).

2. The molding equipment for producing HPVC double-wall corrugated pipes according to claim 1, characterized in that: The storage compartment (51) is uniformly fixed with connecting springs (7); the other end of the connecting springs (7) is fixed with an arc plate (71); the length of the arc plate (71) is the same as the length of the first mold (31).

3. The molding equipment for producing HPVC double-wall corrugated pipes according to claim 2, characterized in that: A buffer (72) is fixedly connected to the side of the top block (57) near the fixed seat (52).

4. The molding equipment for producing HPVC double-wall corrugated pipes according to claim 3, characterized in that: The arc plate (71) has a ball bearing (73) rotatably connected to the surface of the plate that contacts the mold (31) or the mold (32).

5. The molding equipment for producing HPVC double-wall corrugated pipes according to claim 1, characterized in that: The loading and unloading block (53) is inclined on the side near the storage compartment (51), and the opening of the storage compartment (51) is chamfered.

6. A molding method for producing HPVC double-wall corrugated pipes, the molding method being applicable to any one of the molding equipment for producing HPVC double-wall corrugated pipes according to claims 1-5, characterized in that: Includes the following steps: S1, HPVC double-wall corrugated pipe is extruded from the extruder (1) and moves forward, entering between the two sets of shaping molds (3) on the shaping machine (2). The motor on the shaping machine (2) drives the two sets of conveyor belts to rotate the two sets of shaping molds (3), and the HPVC double-wall corrugated pipe exits the ring structure. S2, the second motor (54) on the loading and unloading block (53) rotates the rotating rod (42), causing the fixed block (41) to retract into the corresponding first mold (31) or second mold (32), while the electromagnet (61) attracts the corresponding first mold (31) or second mold (32), and the fourth electric push rod (62) pushes the disassembled first mold (31) or second mold (32) into the storage chamber (51), so that the shaping mold (3) on the shaping machine (2) corresponds to the change of the specifications of the HPVC double wall corrugated pipe, and can extrude a ring structure on the outer wall of the HPVC double wall corrugated pipe of different specifications; S3. The first motor (55) drives the top block (57) to push the first mold (31) or the second mold (32) in the storage compartment (51). After the first mold (31) or the second mold (32) is attracted by the electromagnet (61), the loading and unloading block (53) takes the first mold (31) or the second mold (32) to contact the shaping mold (3) on the shaping machine (2), and then the first mold (31) or the second mold (32) is loaded onto the shaping mold (3) on the shaping machine (2).

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