A cooling and shaping device for PVC plastic pipe production

Abstract

The application relates to the technical field of pipe processing, and particularly discloses a cooling and shaping device for PVC plastic pipe production, which comprises an extruder, a vacuum box and a cooling box arranged in sequence from front to back, a conveying roller is arranged in the vacuum box, and the cooling and shaping device further comprises an auxiliary assembly and a driving assembly; the auxiliary assembly comprises a traction rod, a clamping frame one and a clamping frame two rotatably assembled at the front end of the traction rod, and a cutting rope assembled on the clamping frame one; the driving assembly is connected with the clamping frame one, the clamping frame two and the cutting rope; the conveying roller cooperates with the traction rod to drive the traction rod to move; the front end of the traction rod extends out of the vacuum box; the driving assembly drives the front end of the clamping frame one and the clamping frame two to be retracted to clamp a pipe blank, simultaneously drives the cutting rope to move to cut off the waste on the pipe blank, and then the conveying roller drives the traction rod to move to pull the pipe blank into the vacuum box and the cooling box; the cooling and shaping device for PVC plastic pipe production has the effect of improving the processing efficiency.

Description

Technical Field

[0001] This invention relates to the technical field of pipe fitting processing, and specifically to a cooling and shaping device for PVC plastic pipe production. Background Technology

[0002] PVC plastic pipes are made primarily of polyvinyl chloride resin, supplemented with stabilizers, lubricants, fillers, and other modifying agents, and are produced through extrusion or injection molding. The main processing steps for PVC plastic pipes include raw material formulation, mixing and plasticizing, extrusion molding, and cooling and shaping.

[0003] Patent document CN113386322B discloses a cooling and shaping device for engineering plastic pipe production, including a water cooling device and an air cooling device. The water cooling device and the air cooling device are arranged side-by-side above a base plate, which is equipped with several telescopic hydraulic cylinders. The bottoms of both the water cooling device and the air cooling device are fixedly connected to the moving ends of the lower telescopic hydraulic cylinders. The water cooling device includes a water storage tank, a water-cooling box, a double-layer spray pipe, a spray head, and a spray pipe drive structure. The air cooling device includes an air-cooling box, a double-layer air-blowing pipe, an air-blowing head, and an air outlet pipe drive structure. Comprehensive and thorough cooling of the plastic pipe fittings is achieved through a primary annular water spray cooling and a secondary annular air-blowing cooling system.

[0004] However, this solution also has the following problems: during extrusion startup, unstable melt pressure or uneven plasticization can cause initial material to fail to form, resulting in paste, uneven color, or lumps. Additionally, transitional waste is generated during equipment commissioning. This waste needs to be removed from the production line via a cutting device or manual intervention to prevent it from entering the cooling system. Therefore, in the initial extrusion stage, manual monitoring of the extrusion process is required. If waste appears at the front end, it must be removed manually before connecting the front end to the traction device, which then sends it into the cooling system. Furthermore, as the extruder continues extruding, the material front end needs to be quickly connected to the traction device; otherwise, it will affect the subsequent molding quality. However, manual operation is cumbersome and affects processing efficiency. Summary of the Invention

[0005] This invention provides a cooling and shaping device for PVC plastic pipe production, aiming to solve the problem in related technologies where the efficiency is low and the processing efficiency is affected when the waste material needs to be manually removed during the initial stage of pipe blank extrusion and the pipe blank is connected to the traction device after removal.

[0006] The present invention provides a cooling and shaping device for PVC plastic pipe production, comprising an extruder, a vacuum chamber, and a cooling chamber arranged sequentially from front to back. A conveyor roller is provided inside the vacuum chamber. The device also includes an auxiliary component and a drive component. The auxiliary component includes a traction rod, a clamping frame 1 and a clamping frame 2 rotatably mounted on the front end of the traction rod, and a cutting rope mounted on the clamping frame 1. The drive component is connected to the clamping frame 1, the clamping frame 2, and the cutting rope respectively, so as to drive the clamping frame 1 and the clamping frame 2 to rotate and drive the cutting rope to move toward the front end of the clamping frame 1. The conveyor roller cooperates with the traction rod to drive the traction rod to move. The front end of the traction rod extends out of the vacuum box. The drive assembly drives the front ends of clamping frame one and clamping frame two to retract to clamp the tube blank. At the same time, it drives the cutting rope to move to remove the waste material on the tube blank. Then, the conveying roller drives the traction rod to move to pull the tube blank into the vacuum box and cooling box.

[0007] The effect is that after the extruder extrudes the tube blank, it passes through the vacuum chamber and cooling chamber in sequence to form the tube blank. After the tube blank is extruded and formed, the drive assembly drives the clamping frame one and clamping frame two to rotate, so that the front ends of clamping frame one and clamping frame two approach each other and gradually retract to clamp the formed tube blank. When the drive assembly moves clamping frame one and clamping frame two, it drives the cutting rope to move closer to the tube blank. Since the tube blank is initially extruded at a high temperature and is not hardened, the cutting rope can be used to cut the tube blank while it is being clamped to remove the waste material at the end of the tube blank. Then, the conveyor roller drives the traction rod to move to pull the tube blank into the vacuum chamber and cooling chamber for subsequent forming processes, thereby improving processing efficiency.

[0008] Preferably, the extruder includes an extrusion tube, and the centers of clamping frame one and clamping frame two correspond to the extrusion tube. The front ends of clamping frame one and clamping frame two are respectively provided with guide rod one and guide rod two for clamping the tube blank. Guide rod one is located below guide rod two. When the front ends of clamping frame one and clamping frame two are opened, the front end of the extruded tube blank hangs down under its own weight after passing guide rod one, and guide rod one supports the tube blank.

[0009] The effect is that when the tube blank is extruded, it passes above the first guide rod. Because the tube blank is in a high temperature and unhardened state in the early stage of extrusion, it is easy to deform. After the tube blank passes the first guide rod, the front end of the tube blank hangs down under its own weight. At this time, the first guide rod supports the tube blank. During the process, the first guide rod always supports the tube blank so that when the first clamping frame and the second clamping frame are retracted, the tube blank can be clamped by the first guide rod and the second guide rod.

[0010] Preferably, a slider is slidably mounted on the clamping frame, and a spring is provided on the clamping frame to drive the slider to move upward. The guide rod is connected to the slider. As the tube blank is formed, the pressure on the guide rod gradually increases and drives the slider to move downward. A control component is provided on the clamping frame to detect the slider's movement distance. The control component is connected to the drive component to control the opening and closing of the drive component.

[0011] Its effect is that, in the early stage of tube blank extrusion when it is not formed, as the extrusion continues, the length of the tube blank hanging down increases, and the unformed part will continue to fall off. When the tube blank is formed, the length of the tube blank hanging down gradually increases, and the weight applied to the guide rod one gradually increases. The guide rod one drives the slider to move downward and compresses the spring at the same time. When the slider moves to the specified distance, the control component controls the drive component to open, clamping and cutting the tube blank.

[0012] Preferably, the control component includes a controller and a sensor. The signal output terminal of the sensor is electrically connected to the signal receiving terminal of the controller, and the control terminal of the controller is connected to the drive component. The sensor is used to detect the moving distance of the slider.

[0013] Its effect is that when the slider moves, the sensor detects the distance the slider moves. After the sensor detects that the distance the slider has moved has reached a specified value, it sends a signal to the controller. After receiving the signal, the controller controls the drive component to start and perform subsequent processing on the tube blank.

[0014] Preferably, the drive assembly includes a drive component one, a lead screw, and a drive block. The lead screw is rotatably mounted on a clamping frame one. The output end of the drive component one is connected to the lead screw. The drive block is slidably mounted on the clamping frame one. The drive block is threadedly engaged with the lead screw. The drive block includes a locking block. A locking groove is provided on the clamping frame two. The locking block is slidably locked in the locking groove. When the drive block moves away from the traction rod, it drives the front end of the clamping frame one to retract through the locking block.

[0015] Its effect is that the first drive component drives the lead screw to rotate, the rotation of the lead screw drives the drive block to move on the first clamping frame, and when the drive block moves, it drives the card block to cooperate with different positions in the card slot, thereby driving the first clamping frame and the second clamping frame to rotate, so as to drive the first clamping frame and the second clamping frame to unfold or retract.

[0016] Preferably, the drive block includes a connecting part, and two sets of drive components are arranged horizontally on the clamping frame, with the two ends of the cutting rope connected to the connecting parts in the two drive components respectively.

[0017] The effect is that when the drive block moves towards the front end of clamping frame one, causing clamping frame one and clamping frame two to retract, the cutting rope also moves closer to the tube blank. When clamping frame one and clamping frame two clamp the tube blank, the cutting rope moves to the tube blank to cut it. In addition, the cutting rope is set to move with the drive block so that when clamping frame one and clamping frame two open, the cutting rope moves away from guide rod one, so that the drooping part of the tube blank enters between guide rod one and the cutting rope, reducing the interference of the cutting rope with the drooping of the tube blank, and facilitating subsequent cutting.

[0018] Preferably, the traction rod is provided with an intermediate block, and both the clamping frame one and the clamping frame two include two sliding parts. The intermediate block is provided with a driving member two, and the output end of the driving member two is connected to the sliding part to drive the sliding part to slide along its rotation axis.

[0019] The effect is that during extrusion, the sliding part moves away from the middle block, at which point the distance between the two sliding parts is at its maximum, so that the billet can enter between guide rod one and guide rod two. After the billet is clamped and cut, drive member two moves the sliding part closer to the middle block, at which point the distance between the two sliding parts is at its minimum, so as to reduce the space occupied by clamping frame one and clamping frame two, so that clamping frame one and clamping frame two can move with the traction rod through the conveyor roller to pull the billet.

[0020] Preferably, a reel is rotatably arranged inside the connecting part, the end of the cutting rope is wound around the reel, and a torsion spring connected to the reel is provided inside the connecting part, the torsion spring causing the cutting rope to be in a tensioned state.

[0021] Its effect is that when the sliding part moves, it drives the connecting part to move as well. At the same time, the winding wheel rotates, and under the action of the torsion spring, the cutting rope is unfolded or retracted as the sliding part moves. However, the cutting rope is always kept taut during the process, and when the distance between the sliding parts is at its maximum, the cutting rope is fully unfolded and taut, so as to cut the tube blank.

[0022] Preferably, multiple sets of conveyor rollers are arranged in the vacuum chamber along the conveying direction of the tube blank. The conveyor rollers are provided with relief grooves. When the conveyor rollers convey the traction rod, the inner wall of the relief groove abuts against the outer side of the traction rod.

[0023] The effect is that the conveyor roller contacts the traction rod through the inner wall of the relief groove, which is set in an arc shape to increase the contact area between the conveyor roller and the traction rod, thereby improving the stability of the traction rod when it moves.

[0024] Preferably, both guide rod one and guide rod two include an outer rod and an inner rod. Both ends of the outer rod are provided with inner rods. The outer rod is slidably sleeved outside the inner rod, and the inner rod is connected to the sliding part.

[0025] Its effect is that when the sliding part moves, it drives the inner rod to move relative to the outer rod. That is, the lengths of guide rod one and guide rod two will change with the movement of the sliding part, reducing the phenomenon of guide rod one and guide rod two interfering with the movement of the sliding part.

[0026] Beneficial effects: This invention, by setting up a clamping frame one, a clamping frame two, and a cutting rope, after the tube blank is extruded by the extruder, after the control component detects the tube blank forming, the control component controls the drive component to start. The drive component drives the front ends of clamping frame one and clamping frame two to clamp the tube blank after it is formed. At the same time, it drives the cutting rope to move to remove the waste material at the end of the tube blank. Then, the conveying roller drives the traction rod to move and pull the tube blank, thereby improving the processing efficiency of the tube blank.

[0027] During tube extrusion, a guide rod supports the tube. In the initial, unformed stage, due to its high temperature and unhardened state, material continuously detaches from the ends, resulting in a consistently short drooping length and thus relatively low pressure on the guide rod. After forming, material at the ends of the tube stops detaching, and the drooping length gradually increases. The weight applied to the guide rod also gradually increases, simultaneously moving the slider. The forming process can be assessed by detecting the distance the slider moves, reducing manual intervention and improving processing efficiency. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention.

[0029] Figure 2 yes Figure 1 A schematic diagram of the structure at point A in the middle.

[0030] Figure 3 This is a state view of the auxiliary component when it is opened in an embodiment of the present invention.

[0031] Figure 4 This is a state view of the auxiliary component when it is closed in an embodiment of the present invention.

[0032] Figure 5 This is a partial exploded view of clamping frame one and clamping frame two in an embodiment of the present invention.

[0033] Figure 6 This is a schematic diagram of the structure of the cutting rope and the connecting part in an embodiment of the present invention.

[0034] Figure 7 This is a schematic diagram of the structure of the driving component in an embodiment of the present invention.

[0035] Figure 8 This is a schematic diagram of the internal structure of the vacuum chamber in an embodiment of the present invention.

[0036] Figure 9 yes Figure 8 A sectional view of section AA in the middle.

[0037] Figure label: 1. Extruder; 11. Extrusion tube; 12. Tube blank; 2. Vacuum box; 21. Conveyor roller; 211. Relief groove; 3. Cooling box; 4. Auxiliary components; 41. Traction rod; 411. Intermediate block; 42. Clamping frame one; 421. Guide rod one; 422. Outer rod; 423. Inner rod; 43. Clamping frame two; 431. Guide rod two; 432. Slot; 44. Cutting rope; 5. Drive assembly; 51. Drive component one; 52. Lead screw; 53. Drive block; 531. Slot block; 6. Mounting groove; 61. Slider; 62. Spring; 7. Connecting part; 71. Winding wheel; 8. Sliding part; 9. Drive component two. Detailed Implementation

[0038] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0039] like Figures 1 to 9 As shown, the cooling and shaping device for PVC plastic pipe production of the present invention includes an extruder 1, a vacuum chamber 2, a cooling chamber 3, an auxiliary component 4, and a drive component 5. The extruder 1, vacuum chamber 2, and cooling chamber 3 are arranged sequentially in the front-to-back direction. The extruder 1 is used to melt the raw material and extrude it to form a pipe blank 12. The pipe blank 12 moves back and forth, passing through the vacuum chamber 2 and the cooling chamber 3 in sequence. During the process, the vacuum chamber 2 uses negative pressure adsorption to make the high-temperature pipe blank 12 stick tightly to the inner wall of the sizing sleeve. At the same time, water is sprayed to make the surface of the pipe blank 12 harden quickly, avoiding the phenomenon of collapse caused by gravity sagging or shrinkage. Finally, the cooling chamber 3 cools and shapes the pipe blank 12 to form a plastic pipe. During the process, the drive component 5, in conjunction with the auxiliary component 4, is used to clamp the pipe blank 12 extruded by the extruder 1 and to remove the waste material at the end of the pipe blank 12.

[0040] Reference Figure 2 , Figure 3 , Figure 4The auxiliary component 4 includes: a traction rod 41, a clamping frame 42, a clamping frame 43, and a cutting rope 44. The traction rod 41 is placed inside the vacuum chamber 2, and the front end of the traction rod 41 extends outside the vacuum chamber 2. The clamping frame 42 and the clamping frame 43 are rotatably mounted on the front end of the traction rod 41, that is, the front ends of the clamping frame 42 and the clamping frame 43 are set close to the extruder 1. The cutting rope 44 is installed on the clamping frame 42. The drive component 5 is connected to the clamping frame 42, the clamping frame 43, and the cutting rope 44 respectively, so as to drive the clamping frame 42 and the clamping frame 43 to rotate and drive the cutting rope 44 to move closer to the front end of the clamping frame 42. A conveying roller 21 is provided inside the vacuum chamber 2. The conveying roller 21 conveys the tube blank 12. At the same time, the conveying roller 21 cooperates with the side of the traction rod 41 to convey the traction rod 41.

[0041] When the extruder 1 extrudes the tube blank 12, the drive assembly 5 drives the clamping frame 1 42 and the clamping frame 2 43 to rotate, so that the front ends of the clamping frame 1 42 and the clamping frame 2 43 retract to clamp the end of the tube blank 12. At the same time, the drive assembly 5 drives the cutting rope 44 to move closer to the tube blank 12 to cut off the waste material at the end of the tube blank 12. Then the conveying roller 21 drives the traction rod 41 to move. The movement of the traction rod 41 drives the tube blank 12 to move into the vacuum box 2. At the same time, a conveying roller 21 is also set in the cooling box 3 so that when the traction rod 41 separates from the vacuum box 2, it drives the traction rod 41 to move into the cooling box 3, thereby pulling the tube blank 12 into the cooling box 3.

[0042] Reference Figure 1 , Figure 2 , Figure 3 The extruder 1 includes an extrusion tube 11, which is located at the output end of the extruder 1. That is, the tube blank 12 is formed into a tubular structure through the extrusion tube 11. In the early stage of extrusion and before being treated by the vacuum box 2, the tube blank 12 is in a high temperature and unhardened state, and its end is prone to drooping under its own weight.

[0043] Reference Figure 3 , Figure 6 The cutting rope 44 is made of steel wire rope because when the cutting rope 44 cuts the tube blank 12, it is in a high temperature and unhardened state, and the end of the tube blank 12 can be quickly cut by the steel wire rope.

[0044] Reference Figure 2 , Figure 3 , Figure 4The center of clamping frame 1 42 and clamping frame 2 43 corresponds to the extrusion tube 11. The front ends of clamping frame 1 42 and clamping frame 2 43 are respectively provided with guide rod 1 421 and guide rod 2 431. Guide rod 1 421 and guide rod 2 431 are both arranged in the horizontal direction and are parallel to each other. When the front ends of clamping frame 1 42 and clamping frame 2 43 are retracted, guide rod 1 421 and guide rod 2 431 approach each other and abut against tube blank 12 to clamp tube blank 12.

[0045] Reference Figure 2 , Figure 3 Guide rod 421 is located below guide rod 431 and is parallel to the cutting rope 44. When clamping frame 42 and clamping frame 43 are in the open state, both guide rod 421 and guide rod 431 are positioned close to the extrusion tube 11. As the tube blank 12 is continuously extruded, it moves past guide rod 421. Because the tube blank 12 is at a high temperature and not yet hardened, its end droops after passing guide rod 421. Figure 4 The image shows the tube blank 12 with its end drooping, at which point the guide rod 421 supports the tube blank 12. This allows the cutting rope 44 to move closer to the guide rod 421 and cut the tube blank 12.

[0046] Reference Figure 5 , Figure 7 To facilitate the removal of waste material from the end of the tube blank 12 during tube blank forming, an installation groove 6 is provided on the side of the clamping frame 42. A slider 61 is provided in the installation groove 6. The slider 61 is slidably mounted on the clamping frame 42. A spring 62 is provided on the clamping frame 42. The spring 62 is located in the installation groove 6 and is a spring. The spring is set along the sliding direction of the slider 61. One end of the spring 62 is connected to the inner wall of the installation groove 6, and the other end is connected to the slider 61. The spring 62 is used to drive the slider 61 to move upward.

[0047] A control component (not shown in the figure) is provided on the clamping frame 42. The control component is connected to the drive component 5 to control the opening and closing of the drive component 5. At the same time, the control component detects the distance the slider 61 moves.

[0048] As the tube blank 12 is extruded, the guide rod 421 supports the tube blank 12. Since the tube blank 12 cannot be formed in the early stage of extrusion and is in a high-temperature unhardened state, as the extrusion proceeds, the unformed part at the end of the tube blank 12 will continue to fall off until the tube blank 12 is formed and the end stops falling off, that is, the length of the drooping gradually increases, which causes the pressure on the guide rod 421 to gradually increase. The guide rod 421 drives the slider 61 to move downward. After the control component detects that the distance moved by the slider 61 has reached the specified value, the control component controls the drive component 5 to start, which drives the clamping frame 42 and the clamping frame 43 to retract and clamp the tube blank 12. At the same time, the drooping part of the tube blank 12 is cut off by the cutting rope 44.

[0049] When the cutting rope 44 cuts off the tube blank 12, the front end of the tube blank 12 hangs down to a certain length. At this time, although the tube blank 12 has been formed, there will still be uneven material distribution in the hanging part. In order to ensure product quality, the entire hanging part is cut off.

[0050] When the guide rod 421 drives the slider 61 to move downward, it compresses the spring 62. After the tube blank 12 separates from the guide rod 421, the spring 62 drives the guide rod 421 to move back to the initial position so that the tube blank 12 can be clamped again during the next processing.

[0051] The control components include: a controller and a sensor. The sensor is a distance sensor and is mounted on the clamping frame 42 to detect the distance the slider 61 moves. The controller is also mounted on the clamping frame 42. The signal output terminal of the sensor is electrically connected to the signal receiving terminal of the controller. The control terminal of the controller is connected to the drive component 5 to control the opening and closing of the drive component 5.

[0052] As guide rod 421 moves downward, the sensor detects the distance the slider 61 moves. Once the slider 61 has reached the specified distance, a signal is sent to the controller. Upon receiving the signal, the controller activates the drive assembly 5 to perform clamping and other operations on the tube blank 12. In actual processing, the detection distance of the sensor on the slider 61 can be adjusted according to the forming condition of the tube blank 12 to control the timing of cutting off the end of the tube blank 12.

[0053] Reference Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7The drive assembly 5 includes: a drive component 51, a lead screw 52, ​​and a drive block 53. The lead screw 52 is rotatably mounted on the clamping frame 42 and slides towards the front end of the clamping frame 42. The drive block 53 is slidably mounted on the clamping frame 42 and slides along the length of the lead screw 52. The lead screw 52 passes through the drive block 53, and the lead screw 52 and drive block 53 are threadedly engaged. The drive component 51 is a motor, and its output end is connected to the lead screw 52. That is, when the drive component 51 drives the lead screw 52 to rotate, it can drive the drive block 53 to move. The drive block 53 includes a locking block 531. A locking groove 432 is provided on the clamping frame 43, which faces the front end of the clamping frame 43. The locking block 531 is slidably locked in the locking groove 432.

[0054] The controller's control terminal is electrically connected to the switch of the drive unit 51 to control the switch of the drive unit 51.

[0055] Reference Figure 5 , Figure 6 The drive component 51 drives the drive block 53 to move via the lead screw 52. The movement of the drive block 53 causes the locking block 531 to engage with different positions within the slot 432, causing the clamping frame 42 and the clamping frame 43 to rotate synchronously, thereby causing the front end of the clamping frame 42 to retract or unfold. The locking block 531 is cylindrical, and as the clamping frame 42 and the clamping frame 43 rotate, the angle between them gradually changes. While moving within the slot 432, the locking block 531 can rotate relative to the clamping frame 43 to reduce interference between the locking block 531 and the rotation of the clamping frame 43.

[0056] Reference Figure 5 , Figure 6 The drive block 53 includes a connecting part 7, and two sets of drive components 5 are arranged horizontally. The two ends of the cutting rope 44 are respectively connected to the connecting parts 7 in the two sets of drive components 5. This allows the drive block 53 to move while driving the cutting rope 44 to move. After the clamping frame 1 42 and the clamping frame 2 43 clamp the tube blank 12, the cutting rope 44 moves to the tube blank 12 to achieve cutting of the tube blank 12 while clamping it.

[0057] Reference Figure 2 , Figure 3Both clamping frame 1 (42) and clamping frame 2 (43) include two sliding parts 8. An intermediate block 411 is located at the front end of the traction rod 41, and a driving component 2 (9) is mounted on the intermediate block 411. The driving component 2 (9) is a two-way cylinder. The two sliding parts 8 in clamping frame 1 (42) and clamping frame 2 (43) are rotatably mounted at the output end of the driving component 2 (9). The piston rod of the driving component 2 (9) and the rotation axis of clamping frame 1 (42) are aligned on the same straight line. After clamping frame 1 (42) and clamping frame 2 (43) clamp the tube blank 12, the driving component 2 (9) moves the sliding parts 8 closer to the intermediate block 411 to reduce the distance between the two sliding parts 8 in clamping frame 1 (42), thus reducing the space occupied by clamping frame 1 (42) and clamping frame 2 (43) in the retracted state, so that the traction rod 41 can move clamping frame 1 (42) and clamping frame 2 (43) through the vacuum chamber 2 and the cooling chamber 3.

[0058] Reference Figure 7 The drive block 53 is provided on the sliding part 8. A winding wheel 71 is provided in the connecting part 7. The winding wheel 71 is rotatably mounted in the connecting part 7. A torsion spring is provided on the connecting part 7. The torsion spring is connected to the winding wheel 71. The end of the cutting rope 44 is wound around the winding wheel 71. The torsion spring drives the winding wheel 71 to rotate and wind up the cutting rope 44, so that the cutting rope 44 is in a taut state.

[0059] By setting up the reel 71 and torsion spring, when the driving component 2 9 moves the sliding part 8 closer to or away from the intermediate block 411, the torsion spring can drive the reel 71 to rotate accordingly, so that the cutting rope 44 is always kept taut. This avoids the phenomenon that the cutting rope 44 is in a slack state and affects the operation of other structures when the sliding part 8 moves closer to the intermediate block 411 and is retracted. In addition, when the sliding part 8 is away from the intermediate block 411 and in the open state, it is convenient for the tube blank 12 to enter between the two sliding parts 8, and when the sliding part 8 is in the open state, the cutting rope 44 is fully stretched, that is, the cutting rope 44 has a certain tension when it moves with the driving block 53, so as to cut the tube blank 12.

[0060] Reference Figure 3 , Figure 5 Guide rod 1 421 and guide rod 2 431 have the same structure. Both guide rod 1 421 and guide rod 2 431 include an outer rod 422 and an inner rod 423. There are two inner rods 423 at both ends of the outer rod 422. The outer rod 422 and the inner rod 423 are slidably engaged. The outer rod 422 is sleeved on the outside of the inner rod 423. The inner rod 423 is connected to the sliding part 8 in the clamping frame 1 42 through the slider 61. The sliding part 8 in the clamping frame 2 43 is connected to the inner rod 423.

[0061] When the two sliding parts 8 inside the clamping frame 42 move away from or close to each other, the inner rod 423 slides relative to the outer rod 422, so that the lengths of the guide rod 421 and the guide rod 431 change with the distance between the two sliding parts 8, thereby reducing the phenomenon of the guide rod 421 and the guide rod 431 interfering with the movement of the sliding parts 8.

[0062] The outer rod 422 is sleeved outside the inner rod 423 and contacts the tube blank 12. In order to ensure that the outer rod 422 is always in the middle position between the two inner rods 423, a spring can be installed inside the outer rod 422. The middle of the spring is connected to the inner wall of the outer rod 422, and the two ends of the spring are respectively connected to the two inner rods 423. When the sliding part 8 moves, the outer rod 422 is always between the two inner rods 423 under the action of the spring, so as to support and clamp the tube blank 12.

[0063] Reference Figure 8 , Figure 9 Multiple sets of conveyor rollers 21 are arranged along the conveying direction of the tube blank 12, and multiple sets are also arranged in the vacuum box 2 and the cooling box 3. Multiple conveyor rollers 21 are arranged at intervals. When the traction rod 41 moves, there is always a contact state between the conveyor rollers 21 and the traction rod 41, which improves the stability of the traction rod 41 when it moves.

[0064] Reference Figure 8 , Figure 9 A clearance groove 211 is provided on the side of the conveyor roller 21. The inner wall of the clearance groove 211 is set to be an arc shape corresponding to the traction rod 41. The inner wall of the clearance groove 211 abuts against the outer side of the traction rod 41 to increase the contact area between the conveyor roller 21 and the traction rod 41, thereby improving the stability of the traction rod 41 when it moves.

[0065] The implementation principle of the present invention is as follows: In the initial state, the traction rod 41 is located in the vacuum box 2 and cooperates with the conveying roller 21 in the vacuum box 2. The front ends of the clamping frame 1 42 and the clamping frame 2 43 are in an open state. After the extruder 1 extrudes the tube blank 12, the end of the tube blank 12 hangs down after passing through the guide rod 1 421. The guide rod 1 421 supports the tube blank 12. In the initial stage of extrusion, the tube blank 12 is not formed. As extrusion continues, the material at the end of the tube blank 12 continues to fall.

[0066] After the tube blank 12 is formed, the length of the tube blank 12 hanging down will gradually increase, and the pressure applied to the guide rod 421 by the tube blank 12 will also gradually increase. The guide rod 421 drives the slider 61 to move accordingly, and at the same time compresses the spring 62. Meanwhile, the sensor detects the distance the slider 61 moves. After the sensor detects that the slider 61 has moved a certain distance, the tube blank 12 is formed evenly. The sensor sends a signal to the controller, and the controller controls the drive component 51 to start. The drive component 51 drives the drive block 53 to move, which drives the front ends of the clamping frame 42 and the clamping frame 43 to retract. The guide rod 421 and the guide rod 431 move closer to clamp the tube blank 12. At the same time, the drive block 53 drives the cutting rope 44 to move closer to the tube blank 12 to cut the hanging part of the tube blank 12.

[0067] After clamping and cutting the tube blank 12, the driving component 2 9 drives the sliding part 8 to approach the middle block 411. Then, the conveying roller 21 rotates and drives the traction rod 41 to move sequentially through the vacuum box 2 and the cooling box 3 to pull the tube blank 12 into the vacuum box 2 and the cooling box 3 for shaping.

[0068] By setting up clamping frame 1 42, clamping frame 2 43 and cutting rope 44, after the tube blank 12 is formed, the formed tube blank 12 is clamped and the waste is removed. Then, the tube blank 12 is pulled by traction rod 41 to improve processing efficiency.

[0069] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A cooling and shaping device for PVC plastic pipe production, comprising an extruder, a vacuum chamber, and a cooling chamber arranged sequentially from front to back, wherein a conveyor roller is provided inside the vacuum chamber, characterized in that, It also includes auxiliary components and drive components; the auxiliary components include: a traction rod, a clamping frame one and a clamping frame two rotatably mounted on the front end of the traction rod, and a cutting rope mounted on the clamping frame one; the drive components are respectively connected to the clamping frame one, the clamping frame two, and the cutting rope to drive the clamping frame one and the clamping frame two to rotate and drive the cutting rope to move toward the front end of the clamping frame one; the conveying roller cooperates with the traction rod to drive the traction rod to move. The front end of the traction rod extends out of the vacuum box, and the drive assembly drives the front ends of clamping frame one and clamping frame two to retract to clamp the tube blank. At the same time, it drives the cutting rope to move to remove the waste on the tube blank. Then the conveying roller drives the traction rod to move to pull the tube blank into the vacuum box and cooling box. A slider is slidably mounted on the clamping frame 1. A spring is provided on the clamping frame 1 and connected to the slider. The spring is used to drive the slider to move upward. A guide rod 1 is connected to the slider. As the tube blank is formed, the pressure on the guide rod 1 gradually increases and drives the slider to move downward. A control component is provided on the clamping frame 1 to detect the slider movement distance. The control component is connected to the drive component to control the opening and closing of the drive component. The extruder includes an extrusion tube, and clamping frames one and two are positioned at their centers corresponding to the extrusion tube. The front ends of clamping frames one and clamping frames two are respectively provided with guide rod one and guide rod two for clamping the tube blank. Guide rod one is located below guide rod two. When the front ends of clamping frames one and clamping frames two are opened, the front end of the extruded tube blank hangs down under its own weight after passing guide rod one, and guide rod one supports the tube blank. The drive assembly includes a drive component 1, a lead screw, and a drive block. The lead screw is rotatably mounted on a clamping frame 1. The output end of the drive component 1 is connected to the lead screw. The drive block is slidably mounted on the clamping frame 1. The drive block is threadedly engaged with the lead screw. The drive block includes a locking block. A locking groove is provided on the clamping frame 2. The locking block is slidably locked in the locking groove. When the drive block moves away from the traction rod, the front end of the clamping frame 1 is retracted through the locking block. The drive block includes a connecting part, and two sets of drive components are arranged horizontally on the clamping frame. The two ends of the cutting rope are respectively connected to the connecting parts in the two drive components.

2. The cooling and shaping device for PVC plastic pipe production according to claim 1, characterized in that, The control component includes a controller and a sensor. The signal output terminal of the sensor is electrically connected to the signal receiving terminal of the controller. The control terminal of the controller is connected to the drive component. The sensor is used to detect the moving distance of the slider.

3. The cooling and shaping device for PVC plastic pipe production according to claim 1, characterized in that, The traction rod is provided with a middle block. Both the clamping frame one and the clamping frame two include two sliding parts. The middle block is provided with a driving component two. The output end of the driving component two is connected to the sliding part to drive the sliding part to slide along its rotation axis.

4. The cooling and shaping device for PVC plastic pipe production according to claim 3, characterized in that, A rotatable reel is installed inside the connecting part, and the end of the cutting rope is wound around the reel. A torsion spring connected to the reel is installed inside the connecting part, and the torsion spring drives the cutting rope to be in a tensioned state.

5. The cooling and shaping device for PVC plastic pipe production according to claim 1, characterized in that, Multiple sets of conveyor rollers are arranged inside the vacuum chamber along the conveying direction of the tube blank. The conveyor rollers are provided with relief grooves. When the conveyor rollers convey the traction rod, the inner wall of the relief groove abuts against the outer side of the traction rod.

6. The cooling and shaping device for PVC plastic pipe production according to claim 3, characterized in that, Both guide rod one and guide rod two include an outer rod and an inner rod. The outer rod has an inner rod at both ends. The outer rod is slidably sleeved outside the inner rod, and the inner rod is connected to the sliding part.

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