An automatic turnaround system for the production of large-diameter polyethylene composite pipes

Abstract

This invention relates to the technical field of polyethylene composite pipe production equipment, specifically disclosing an automatic folding-back system for large-diameter polyethylene composite pipe production. The system includes a pipe clamping mechanism, a belt winding folding-back mechanism, and a belt shearing mechanism. The pipe clamping mechanism is equipped with a clamping cylinder and a positioning box, clamping the polyethylene pipe between the clamping cylinder and the positioning box. The belt winding folding-back mechanism is mounted on the positioning box and includes a belt, a winding box, and a winding box bracket. The winding box bracket is rotatably mounted inside the positioning box and rotates around the outer circumference of the polyethylene pipe. A winding box is slidably connected to the winding box bracket, and the belt roll is installed inside the winding box. The winding box bracket drives the belt to wind onto the polyethylene pipe. A belt shearing structure is installed above the polyethylene pipe. This invention features a high degree of automation, reduces production costs, and improves production efficiency. The folding-back motor controls the automatic folding of the belt, resulting in tighter winding of the unidirectional belt, preventing loosening, improving the quality of the polyethylene composite pipe, and extending its service life.

Description

Technical Field

[0001] This invention relates to the field of polyethylene composite pipe production equipment technology, specifically to an automatic folding system for the production of large-diameter polyethylene composite pipes. Background Technology

[0002] Polyethylene (PE) pipe is a commonly used plastic pipe material. It is a highly crystalline, non-polar thermoplastic resin with a wide range of applications, such as conduits for strong and weak current wiring, water supply pipes, and drainage pipes. To expand the applications of PE pipe, it is necessary to further improve its performance and overall strength. This requires repeatedly winding steel wire around the PE pipe to form a high-strength PE composite pipe with an outer steel wire mesh. To improve the thermal insulation performance of PE pipe, unidirectional tape needs to be wound around the outside of the PE pipe, forming a PE composite pipe with the original dimensions of the joints at both ends and a thick insulation layer in the middle. Current winding equipment is mainly an improvement on the original steel wire winding equipment. The PE pipe is rotated by a rotary motor, and the position of the unidirectional tape is fixed. The direction and angle of the unidirectional tape are changed by a lever, and the angle adjustment is not fixed. PE composite pipes produced in this way have wrinkles between the unidirectional tapes on the outside, poor sealing, and the unidirectional tape insulation layer may fall off during later use. Polyethylene pipes with a diameter of 300mm or more are classified as large-diameter polyethylene pipes. These pipes are relatively heavy and unsuitable for existing unidirectional tape fixing and polyethylene pipe rotation winding methods. Furthermore, this method cannot achieve automatic unidirectional tape rewinding; it can only forcibly change the angle, resulting in poor winding quality. Glue application and cutting are both done manually, leading to low automation, high production costs, and low production efficiency. Therefore, there is an urgent need to design an automatic rewinding system for the production of large-diameter polyethylene composite pipes to address the problems of the lack of corresponding winding equipment and rewinding systems for existing insulation layers, as well as the poor winding quality, low automation, and low production efficiency of existing winding machines. Summary of the Invention

[0003] To address the problems existing in the prior art, the purpose of this invention is to provide an automatic folding-back system for the production of large-diameter polyethylene composite pipes.

[0004] The technical solution adopted by the present invention to solve its technical problem is: an automatic folding system for the production of large-diameter polyethylene composite pipes, including a pipe clamping mechanism, a winding folding mechanism and a shearing mechanism, wherein the pipe clamping mechanism is provided with a clamping cylinder and a positioning box, and the polyethylene pipe is clamped between the clamping cylinder and the positioning box.

[0005] The belt winding and turning mechanism is installed on the positioning box. The belt winding and turning mechanism is equipped with a belt, a winding box and a winding box bracket. The winding box bracket is rotatably installed in the positioning box. The winding box bracket rotates around the outer circumference of the polyethylene pipe. The winding box is slidably connected to the winding box bracket. The belt drum is installed in the winding box. The winding box bracket drives the belt to wind on the polyethylene pipe.

[0006] The shearing structure is installed above the polyethylene pipe. The shearing mechanism is equipped with a semi-circular sleeve and a cutter. The semi-circular sleeve descends and wraps around the outside of the polyethylene pipe, and the cutter cuts the strip.

[0007] Specifically, the bottom of the clamping cylinder is mounted on the column, and the bottom of both the column and the positioning box are mounted on the base.

[0008] Specifically, the end of the cylinder rod of the clamping cylinder is connected to a support shaft, the support shaft extends into one end of the polyethylene pipe, a baffle is fixedly connected to the support shaft, and a limiting groove is provided on the side of the baffle near the polyethylene pipe. The wall of the polyethylene pipe extends into the limiting groove, and the limiting groove positions the polyethylene pipe.

[0009] The positioning box is connected to the second support shaft. One end of the second support shaft extends into the positioning box and is fixed on the turntable. The other end of the second support shaft extends into the other end of the polyethylene pipe. The second support shaft is rotatably connected to the second baffle via a bearing. The second baffle rests against the end of the polyethylene pipe. The side of the second baffle near the polyethylene pipe is provided with the second limiting groove. The wall of the polyethylene pipe extends into the second limiting groove, which positions the polyethylene pipe. The second baffle remains stationary when the second support shaft rotates with the turntable.

[0010] Specifically, the positioning box has a circular groove on its outer wall, a rotary motor is installed inside the positioning box, the motor shaft of the rotary motor is connected to the turntable, the rotary motor drives the turntable to rotate, a tape box bracket is fixedly connected to the turntable, the tape box bracket extends out of the circular groove, and several support rollers are evenly arranged inside the positioning box and on the outer circumference of the turntable. The support rollers roll in contact with the outer circumference of the turntable, and support the turntable to rotate.

[0011] Specifically, the tape box bracket has two parallel slide rails, and a slide plate is slidably connected to the two slide rails. A reversing motor is fixedly connected to the bottom of the slide plate, and the bottom of the reversing motor is mounted on a lead screw seat. One side of the lead screw seat is threaded to a lead screw through a threaded hole, and an auxiliary roller is installed on the bottom of the other side of the lead screw seat. The auxiliary roller rolls on the inner wall of the tape box bracket, and supports and moves the auxiliary lead screw seat. The lead screw is rotatably mounted inside the tape box bracket through two bearing seats. One end of the lead screw is connected to the motor shaft of a moving motor, and the moving motor drives the slide plate and the reversing motor to move along the slide rails.

[0012] Specifically, the slide plate has a through hole in the middle, and the motor shaft of the rewind motor passes through the through hole and is connected to the bottom of the tape box. The rewind motor drives the tape box to rotate. A laser rangefinder is also provided on the tape box bracket. The laser of the laser rangefinder hits the side wall of the tape box. The laser rangefinder identifies and controls the reciprocating movement distance of the tape box.

[0013] Specifically, the tape box has a tape outlet near the polyethylene pipe. Two clamping cylinders are installed opposite each other at the tape outlet. The cylinder rods of the clamping cylinders are connected to an "L"-shaped bracket. An adjusting screw is rotatably connected to the base plate of the "L"-shaped bracket via a bearing. A clamping plate is also fixed to the base plate of the "L"-shaped bracket. A guide rail is provided on the inner side of the "L"-shaped bracket. A clamping slide plate is slidably connected to the guide rail. The clamping slide plate has a threaded hole, and an adjusting screw is threaded into the threaded hole. The rotation of the adjusting screw controls the raising and lowering of the clamping slide plate. The clamping slide plate also has a strip hole through which the clamping plate passes. The clamping cylinders and the adjusting screw control the tightness of the tape exiting from the tape box.

[0014] Specifically, the shearing mechanism also includes a gantry frame mounted on a base. Two lifting cylinders are mounted on the gantry frame, with the cylinder rods of the lifting cylinders connected to a mounting plate. Two semi-circular sleeves are rotatably connected to the mounting plate via pins. The semi-circular sleeves are arranged opposite each other. A cylinder mounting plate is mounted on the mounting plate, and two sleeve cylinders are movably connected to the cylinder mounting plate. The cylinder rods of the sleeve cylinders are movably connected to the outer wall of the semi-circular sleeves. The sleeve cylinders control the opening and closing of the semi-circular sleeves. A cutter is provided at the bottom of one semi-circular sleeve. When the two semi-circular sleeves are closed, the cutter cuts the strip.

[0015] Specifically, the inner wall of the semi-circular sleeve is provided with a brush, and the upper inner side of the semi-circular sleeve is provided with a glue outlet pipe, which is connected to an external glue supply pump and supplies glue to the brush.

[0016] A method for operating an automatic folding-back system for the production of large-diameter polyethylene composite pipes includes the following steps:

[0017] 1) First, set the winding angle and winding spacing of the tape on the polyethylene pipe on the electronic control system, that is, determine the speed of the moving motor and the rotating motor and the distance limited by the laser rangefinder.

[0018] 2) Manually clamp one end of the polyethylene pipe into the limiting groove of the second baffle, and use a remote control to control the cylinder rod of the clamping cylinder to extend, so that the limiting groove of the first baffle is pressed against the other end of the polyethylene pipe.

[0019] 3) Start the lifting cylinder to control the two semi-circular sleeves to descend, the cylinder rod of the sleeve cylinder extends to control the two semi-circular sleeves to close inward, the glue on the brush is applied to the outer wall of the polyethylene pipe, and the sleeve cylinder and the lifting cylinder control the semi-circular sleeves to reset.

[0020] 4) Determine the belt tension by adjusting the screw and belt clamping cylinder according to the width and thickness of the belt, and attach the head of the belt to the edge of the polyethylene pipe where the belt needs to be wrapped;

[0021] 5) Turn on the equipment switch. The rotary motor and the moving motor work simultaneously. The rotary motor drives the tape box to wrap around the polyethylene tube through the turntable and tape box bracket. The tape in the tape box is evenly wound on the polyethylene tube at a set angle. When the tape wraps to the edge of the set winding tape on the other side of the polyethylene tube, the folding motor controls the tape box to rotate 180°. At the same time, it controls the tape to automatically fold 180° and the tape angle to automatically return to the opposite direction of the previous winding. The rotary motor continues to rotate in the original direction, and the moving motor reverses to control the tape box to move in the opposite direction and start winding the tape in the opposite direction. The tape is wound in the same way.

[0022] 6) After the polyethylene pipe is wound, turn off the equipment switch, start the lifting cylinder to control the two semi-circular sleeves to descend, extend the cylinder rod of the sleeve cylinder to control the two semi-circular sleeves to close inward, cut the tape with the cutter, apply the adhesive on the brush to the outer layer of the tape for bonding and fixing, control the semi-circular sleeves to reset with the sleeve cylinder and the lifting cylinder, retract and reset with the clamping cylinder, remove the composite pipe, replace with a new polyethylene pipe and repeat steps 1)-6).

[0023] The present invention has the following beneficial effects:

[0024] The automatic folding system for producing large-diameter polyethylene composite pipes designed in this invention employs automated tape feeding, glue application, winding, and cutting processes. This high degree of automation reduces production costs and improves efficiency. The system utilizes a combination of a rotary motor and a moving motor to keep the polyethylene pipe stationary while the unidirectional tape automatically winds around it, reducing power loss and increasing efficiency. The designed folding motor controls the tape box and tape to automatically rotate 180°, with the unidirectional tape pressing against the seam of the previous loop and continuing to rotate. The rotary motor remains in operation, resulting in tighter winding of the unidirectional tape, preventing loosening and improving the quality and service life of the polyethylene composite pipe. Attached Figure Description

[0025] Figure 1 This is a front view of an automatic turnaround system used in the production of large-diameter polyethylene composite pipes.

[0026] Figure 2 This is a schematic diagram of the structure on which a polyethylene pipe is installed on a pipe clamping mechanism.

[0027] Figure 3 This is a schematic diagram of a structure with a winding and turning mechanism controlling the turning state.

[0028] Figure 4 This is a side view of an automatic folding system used in the production of large-diameter polyethylene composite pipes.

[0029] Figure 5 It is a cross-sectional view with a winding and turning mechanism.

[0030] Figure 6 yes Figure 5Sectional view along the AA direction.

[0031] Figure 7 yes Figure 6 Enlarged view of point A in the middle.

[0032] Figure 8 This is a schematic diagram of the structure at the tape exit point of the tape box.

[0033] Figure 9 This is a schematic diagram of the structure with the polyethylene pipe wrapped around its edge.

[0034] Figure 10 This is a schematic diagram of a structure with the tube wrapped around the edge of a polyethylene pipe and then folded back.

[0035] Figure 11 This is a schematic diagram of the structure where the polyethylene pipe is wound around and then folded back before continuing to be wound.

[0036] In the figure: 1-pipe clamping mechanism, 1.1-clamping cylinder, 1.2-positioning box, 1.3-support shaft one, 1.4-support shaft two, 1.5-baffle one, 1.6-baffle two, 1.7-limiting groove one, 1.8-limiting groove two, 1.9-column, 1.10-base;

[0037] 2-With winding and turning mechanism, 2.1-Belt, 2.2-Belt box, 2.3-Belt box bracket, 2.4-Slide rail, 2.5-Slide plate, 2.6-Moving motor, 2.7-Lead screw, 2.8-Bearing seat, 2.9-Turnaround motor, 2.10-Lead screw nut seat, 2.11-Auxiliary roller, 2.12-Circular slide groove, 2.13-Turntable, 2.14-Rotary motor, 2.15-Laser rangefinder, 2.16-Belt outlet, 2.17-With clamping cylinder, 2.18-"L" shaped bracket, 2.19-Guide rail, 2.20-Clamping slide plate, 2.21-Adjusting screw, 2.22-Clamping plate, 2.23-Supporting roller;

[0038] 3-With shearing mechanism, 3.1-Gantry frame, 3.2-Lifting cylinder, 3.3-Mounting plate, 3.4-Semi-circular sleeve, 3.5-Sleeve cylinder, 3.6-Brush, 3.7-Cutter, 3.8-Cylinder mounting plate;

[0039] 4-Polyethylene pipe. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0041] like Figure 1-11As shown, an automatic folding system for the production of large-diameter polyethylene composite pipes includes a pipe clamping mechanism 1, a folding mechanism with winding function 2, and a shearing mechanism 3. The pipe clamping mechanism 1 is equipped with a clamping cylinder 1.1, a positioning box 1.2, and a base 1.10. The polyethylene pipe 4 is clamped between the clamping cylinder 1.1 and the positioning box 1.2. The bottom of the clamping cylinder 1.1 is mounted on a column 1.9, and the bottoms of both the column 1.9 and the positioning box 1.2 are mounted on the base 1.10.

[0042] The cylinder rod end of clamping cylinder 1.1 is connected to support shaft 1.3. Support shaft 1.3 extends into one end of polyethylene pipe 4. Baffle 1.5 is fixedly connected to support shaft 1.3. Baffle 1.5 has a limiting groove 1.7 on the side near polyethylene pipe 4. The wall of polyethylene pipe 4 extends into limiting groove 1.7, which positions polyethylene pipe 4. Positioning box 1.2 is connected to support shaft 1.4. One end of support shaft 1.4 extends into positioning box 1.2 and is fixed to the rotating... On disc 2.13, the other end of support shaft 2.4 extends into the other end of polyethylene pipe 4. Support shaft 2.4 is rotatably connected to baffle 2.6 via bearing. Baffle 2.6 rests against the end of polyethylene pipe 4. Baffle 2.6 has a limiting groove 2.8 on the side near polyethylene pipe 4. The wall of polyethylene pipe 4 extends into limiting groove 2.8. Limiting groove 2.8 positions polyethylene pipe 4. When support shaft 2.4 rotates with disc 2.13, baffle 2.6 remains stationary.

[0043] The winding and turning mechanism 2 is installed on the positioning box 1.2. The winding and turning mechanism 2 includes a belt 2.1, a winding box 2.2, a winding box bracket 2.3, a moving motor 2.6, a turning motor 2.9, a circular groove 2.12, a turntable 2.13, a rotary motor 2.14, and a belt outlet 2.16. The belt 2.1 is a unidirectional belt. The winding box bracket 2.3 is rotatably installed in the positioning box 1.2 and rotates around the outer circumference of the polyethylene pipe 4. The winding box 2.2 is slidably connected to the winding box bracket 2.3. The drum of the belt 2.1 is installed in the winding box 2.2. The winding box bracket 2.3 drives the unidirectional belt to wind onto the polyethylene pipe 4.

[0044] The positioning box 1.2 has a circular groove 2.12 on its outer wall. A rotary motor 2.14 is installed inside the positioning box 1.2. The motor shaft of the rotary motor 2.14 is connected to a turntable 2.13. The rotary motor 2.14 drives the turntable 2.13 to rotate. A tape box bracket 2.3 is fixedly connected to the turntable 2.13. The tape box bracket 2.3 extends out of the circular groove 2.12. Several support rollers 2.23 are evenly arranged inside the positioning box 1.2 and on the outer circumference of the turntable 2.13. The support rollers 2.23 roll in contact with the outer circumference of the turntable 2.13 and support and assist the rotation of the turntable 2.13.

[0045] Two parallel slide rails 2.4 are provided on the tape box bracket 2.3. A slide plate 2.5 is slidably connected to the two slide rails 2.4. A return motor 2.9 is fixedly connected to the bottom of the slide plate 2.5. The bottom of the return motor 2.9 is mounted on a lead screw nut 2.10. One side of the lead screw nut 2.10 is threaded to a lead screw 2.7 through a threaded hole. An auxiliary roller 2.11 is mounted on the bottom of the other side of the lead screw nut 2.10. The auxiliary roller 2.11 rolls on the inner wall of the tape box bracket 2.3. The auxiliary roller 2.11 supports and moves the auxiliary lead screw nut 2.10. The lead screw 2.7 is rotatably mounted inside the tape box bracket 2.3 through two bearing seats 2.8. One end of the lead screw 2.7 is connected to the motor shaft of a moving motor 2.6. The moving motor 2.6 drives the slide plate 2.5 and the return motor 2.9 to move along the slide rails 2.4.

[0046] A through hole is provided in the middle of the slide plate 2.5. The motor shaft of the reversing motor 2.9 passes through the through hole and is connected to the bottom of the tape box 2.2. The reversing motor 2.9 drives the tape box 2.2 to rotate. A laser rangefinder 2.5 is also provided on the tape box bracket 2.3. The laser of the laser rangefinder 2.15 hits the side wall of the tape box 2.2. The laser rangefinder 2.15 identifies and controls the reciprocating movement distance of the tape box 2.2 to determine the length of the unidirectional tape wound on the polyethylene pipe 4, that is, to determine the position of the two sides of the winding.

[0047] The tape box 2.2 has a tape outlet 2.16. Two clamping cylinders 2.17 are installed opposite each other at the tape outlet 2.16. The cylinder rods of the clamping cylinders 2.17 are connected to an "L"-shaped bracket 2.18. The base plate of the "L"-shaped bracket 2.18 is rotatably connected to an adjusting screw 2.21 via a bearing. A clamping plate 2.22 is also fixed to the base plate of the "L"-shaped bracket 2.18. A guide rail 2.19 is provided on the inner side of the "L"-shaped bracket 2.18, and a clamping slide plate is slidably connected to the guide rail 2.19. 2.20 The clamping slide plate 2.20 is provided with a threaded hole, and an adjusting screw 2.21 is threaded into the threaded hole. The rotation of the adjusting screw 2.21 controls the lifting and lowering of the clamping slide plate 2.20. The clamping slide plate 2.20 is also provided with a strip hole, through which the clamping plate 2.22 passes. The clamping cylinder 2.17 and the adjusting screw 2.21 control the tension of the tape output from the tape box 2.2. The two sides of the unidirectional tape are located between the "L"-shaped bracket 2.18, the clamping slide plate 2.20 and the clamping plate 2.22.

[0048] The shearing structure 3 is installed above the polyethylene pipe 4. The shearing mechanism 3 is equipped with a gantry 3.1, a lifting cylinder 3.2, a semi-circular sleeve 3.4, a brush 3.5, and a cutter 3.7. The semi-circular sleeve 3.4 descends and wraps around the outside of the polyethylene pipe 4, and the cutter 3.7 cuts the strip 2.1.

[0049] The gantry frame 3.1 is mounted on the base 1.10. Two lifting cylinders 3.2 are mounted on the gantry frame 3.1. The cylinder rods of the lifting cylinders 3.2 are connected to the mounting plate 3.3. Two semi-circular sleeves 3.4 are rotatably connected to the mounting plate 3.3 via pins. The semi-circular sleeves 3.4 are arranged opposite to each other. A cylinder mounting plate 3.8 is mounted on the mounting plate 3.3. Two sleeve cylinders 3.5 are rotatably connected to the cylinder mounting plate 3.8. The cylinder rods of the sleeve cylinders 3.5 are rotatably connected to the outer wall of the semi-circular sleeves 3.4. The sleeve cylinders 3.5 control the opening and closing of the semi-circular sleeves 3.4. A cutter 3.7 is provided at the bottom end of one semi-circular sleeve 3.4. When the sleeve cylinders 3.5 control the two semi-circular sleeves 3.4 to close, the cutter 3.7 cuts the strip 2.1.

[0050] A brush 3.6 is provided on the inner wall of the semi-circular sleeve 3.4. A glue outlet pipe is provided on the upper inner side of the semi-circular sleeve 3.4. The glue outlet pipe is connected to an external glue supply pump. The glue outlet pipe supplies glue to the brush 3.6. The glue on the brush 3.6 is evenly applied to the outer wall of the polyethylene pipe 4 and the outer wall of the unidirectional tape.

[0051] A method for operating an automatic winding device for producing polyethylene composite pipes includes the following steps:

[0052] 1) First, set the winding angle and winding spacing of the belt on the polyethylene pipe 4 on the electronic control system, that is, determine the rotation speed of the moving motor 2.6 and the rotating motor 2.14 and the distance limited by the laser rangefinder 2.15;

[0053] 2) Manually clamp one end of the polyethylene pipe 4 into the limiting groove 1.8 of the baffle 1.6, and use a remote control to control the cylinder rod of the clamping cylinder 1.1 to extend, so that the limiting groove 1.7 of the baffle 1.5 limits and presses against the other end of the polyethylene pipe 4.

[0054] 3) Start the lifting cylinder 3.2 to control the two semi-circular sleeves 3.4 to descend, the cylinder rod of the sleeve cylinder 3.5 extends to control the two semi-circular sleeves 3.4 to close inward, the adhesive on the brush 3.6 is applied to the outer wall of the polyethylene pipe 4, and the sleeve cylinder 3.5 and the lifting cylinder 3.2 control the semi-circular sleeves 3.4 to rise and reset.

[0055] 4) Adjust the tension of the belt 2.1 by adjusting the screw 2.21 and the belt clamping cylinder 2.17 according to the width and thickness of the unidirectional belt, and stick the head of the unidirectional belt to the edge of the polyethylene pipe 4 where the belt needs to be wrapped;

[0056] 5) Turn on the equipment switch. The rotary motor 2.14 and the moving motor 2.6 work simultaneously. The rotary motor 2.14 drives the tape box 2.2 to wrap around the polyethylene pipe 4 via the turntable 2.13 and the tape box bracket 2.3. The unidirectional tape in the tape box 2.2 is evenly wound onto the polyethylene pipe 4 at a set angle (e.g., ...). Figure 9As shown), when the unidirectional tape winds to the edge of the winding tape set on the other side of the polyethylene pipe 4, the folding motor 2.9 controls the winding box 2.2 to rotate 180°, and at the same time controls the unidirectional tape to automatically fold 180°, and the tape angle automatically returns to the opposite direction of the previous winding (as shown). Figure 3 and 10 As shown), the rotary motor 2.14 continues to rotate in its original direction, while the moving motor 2.6 reverses to control the tape box 2.2 to move in the opposite direction, beginning the reverse winding of the tape (as shown). Figure 11 As shown), the strip is wound back and forth in sequence;

[0057] 6) After the polyethylene pipe 4 tape 2.1 is wound, turn off the equipment switch, start the lifting cylinder 3.2 to control the two semi-circular sleeves 3.4 to descend, and extend the cylinder rod of the sleeve cylinder 3.5 to control the two semi-circular sleeves 3.4 to close inward. The cutter 3.7 cuts the tape, and the adhesive on the brush 3.6 is applied to the outer layer of tape 2.1 for pasting and fixing. The sleeve cylinder 3.5 and the lifting cylinder 3.2 control the semi-circular sleeves 3.4 to rise and reset. The clamping cylinder 1.2 is retracted and reset. Remove the polyethylene composite pipe, replace it with a new polyethylene 4 pipe, and repeat steps 1)-6).

[0058] This invention is not limited to the above-described embodiments. Anyone should know that any structural changes made under the guidance of this invention, and any technical solutions that are the same as or similar to this invention, fall within the protection scope of this invention.

[0059] The technologies, shapes, and structures not described in detail in this invention are all known technologies.

Claims

1. An automatic folding-back system for the production of large-diameter polyethylene composite pipes, characterized in that, The device includes a pipe clamping mechanism, a winding and folding mechanism, and a shearing mechanism. The pipe clamping mechanism is equipped with a clamping cylinder and a positioning box, which clamps a polyethylene pipe. The cylinder rod of the clamping cylinder is connected to a support shaft 1, which extends into one end of the polyethylene pipe. A baffle 1 is fixedly connected to the support shaft 1, and a limiting groove 1 is provided on the side of the baffle 1 near the polyethylene pipe. The wall of the polyethylene pipe extends into the limiting groove 1, which positions the polyethylene pipe. The positioning box is connected to a support shaft 2, one end of which extends into the positioning box and is fixed on a turntable. The other end of the support shaft 2 extends into the other end of the polyethylene pipe. A baffle 2 is rotatably connected to the support shaft 2 via a bearing. The baffle 2 rests against the end of the polyethylene pipe. A limiting groove 2 is provided on the side of the baffle 2 near the polyethylene pipe, and the wall of the polyethylene pipe extends into the limiting groove 2, which positions the polyethylene pipe. The baffle 2 remains stationary when the support shaft 2 rotates with the turntable. The winding and folding mechanism is mounted on the positioning box. The mechanism includes a belt, a winding box, and a winding box bracket. The winding box bracket is rotatably mounted inside the positioning box and rotates around the outer circumference of the polyethylene pipe. The winding box is slidably connected to the winding box bracket, and the belt spool is installed inside the winding box. The winding box bracket drives the belt to wind onto the polyethylene pipe. A circular groove is provided on the outer wall of the positioning box. A rotary motor is installed inside the positioning box, and the motor shaft is connected to a turntable. The rotary motor drives the turntable to rotate, and the winding box bracket is fixedly connected to the turntable. The winding box bracket extends out of the circular groove. Several support rollers are evenly distributed inside the positioning box and around the outer circumference of the turntable. The roller makes rolling contact with the outer circumference of the turntable, supporting the roller and assisting the turntable in rotation; two parallel slide rails are provided on the tape box bracket, and a slide plate is slidably connected to the two slide rails. The bottom of the slide plate is fixedly connected to the return motor, and the bottom of the return motor is mounted on the lead screw seat. One side of the lead screw seat is threaded to the lead screw through a threaded hole, and the other side of the lead screw seat is equipped with an auxiliary roller. The auxiliary roller rolls on the inner wall of the tape box bracket, and the auxiliary roller supports and assists the lead screw seat in movement. The lead screw is rotatably mounted inside the tape box bracket through two bearing seats. One end of the lead screw is connected to the motor shaft of the moving motor, and the moving motor drives the slide plate and the return motor to move along the slide rails. The shearing structure is installed above the polyethylene pipe. The shearing mechanism is equipped with a semi-circular sleeve and a cutter. The semi-circular sleeve descends and wraps around the outside of the polyethylene pipe, and the cutter cuts the strip.

2. The automatic folding-back system for the production of large-diameter polyethylene composite pipes according to claim 1, characterized in that, The bottom of the clamping cylinder is mounted on the column, and the bottom of both the column and the positioning box are mounted on the base.

3. The automatic folding-back system for the production of large-diameter polyethylene composite pipes according to claim 1, characterized in that, The slide has a through hole in the middle. The motor shaft of the reversing motor passes through the through hole and is connected to the bottom of the tape box. The reversing motor drives the tape box to rotate. A laser rangefinder is also provided on the tape box bracket. The laser of the laser rangefinder hits the side wall of the tape box. The laser rangefinder identifies and controls the reciprocating movement distance of the tape box.

4. The automatic folding-back system for the production of large-diameter polyethylene composite pipes according to claim 1, characterized in that, The tape box has a tape outlet near the polyethylene pipe. Two clamping cylinders are installed opposite each other at the tape outlet. The cylinder rods of the clamping cylinders are connected to an "L"-shaped bracket. An adjusting screw is rotatably connected to the base plate of the "L"-shaped bracket via a bearing. A clamping plate is also fixed to the base plate of the "L"-shaped bracket. A guide rail is provided on the inner side of the "L"-shaped bracket. A clamping slide plate is slidably connected to the guide rail. The clamping slide plate has a threaded hole, and an adjusting screw is threaded into the threaded hole. The rotation of the adjusting screw controls the raising and lowering of the clamping slide plate. The clamping slide plate also has a strip hole through which the clamping plate passes. The clamping cylinders and the adjusting screw control the tightness of the tape exiting from the tape box.

5. The automatic folding-back system for the production of large-diameter polyethylene composite pipes according to claim 1, characterized in that, The shearing mechanism also includes a gantry frame mounted on a base. Two lifting cylinders are mounted on the gantry frame, with the cylinder rods of the lifting cylinders connected to a mounting plate. Two semi-circular sleeves are rotatably connected to the mounting plate via pins. The semi-circular sleeves are arranged opposite each other. A cylinder mounting plate is mounted on the mounting plate, and two sleeve cylinders are movably connected to the cylinder mounting plate. The cylinder rods of the sleeve cylinders are movably connected to the outer wall of the semi-circular sleeves. The sleeve cylinders control the opening and closing of the semi-circular sleeves. A cutter is provided at the bottom of one semi-circular sleeve. When the two semi-circular sleeves are closed, the cutter cuts the strip.

6. The automatic folding-back system for the production of large-diameter polyethylene composite pipes according to claim 1, characterized in that, The inner wall of the semi-circular sleeve is equipped with a brush, and the upper inner side of the semi-circular sleeve is equipped with a glue outlet pipe. The glue outlet pipe is connected to an external glue supply pump and supplies glue to the brush.

7. The working method of the automatic reversing system for the production of large-diameter polyethylene composite pipes according to any one of claims 1-6, characterized in that, Includes the following steps: 1) First, set the winding angle and winding spacing of the tape on the polyethylene pipe on the electronic control system, that is, determine the speed of the moving motor and the rotating motor and the distance limited by the laser rangefinder. 2) Manually clamp one end of the polyethylene pipe into the limiting groove of the second baffle, and use a remote control to control the cylinder rod of the clamping cylinder to extend, so that the limiting groove of the first baffle is pressed against the other end of the polyethylene pipe. 3) Start the lifting cylinder to control the two semi-circular sleeves to descend. The cylinder rod of the sleeve cylinder extends to control the two semi-circular sleeves to close inward. The glue on the brush is applied to the outer wall of the polyethylene pipe. The sleeve cylinder and the lifting cylinder control the semi-circular sleeves to rise and reset. 4) Determine the belt tension by adjusting the screw and belt clamping cylinder according to the width and thickness of the belt, and attach the head of the belt to the edge of the polyethylene pipe where the belt needs to be wrapped; 5) Turn on the equipment switch. The rotary motor and the moving motor work simultaneously. The rotary motor drives the tape box to wrap around the polyethylene pipe through the turntable and tape box bracket. The tape in the tape box is evenly wound on the polyethylene pipe at a set angle. When the tape wraps to the edge of the winding tape set on the other side of the polyethylene pipe, the folding motor controls the tape box to rotate 180°. At the same time, it controls the tape to automatically fold 180° and the tape angle to automatically return to the opposite direction of the previous winding. The rotary motor continues to rotate in the original direction, and the moving motor reverses to control the tape box to move in the opposite direction and start winding the tape in the opposite direction. The tape is wound in the same way. 6) After the polyethylene pipe is wound, turn off the equipment switch, start the lifting cylinder to control the two semi-circular sleeves to descend, the cylinder rod of the sleeve cylinder extends to control the two semi-circular sleeves to close inward, the cutter cuts the tape, the adhesive on the brush is applied to the outer layer of the tape for adhesion and fixation, the sleeve cylinder and the lifting cylinder control the semi-circular sleeves to rise and reset, the clamping cylinder retracts and resets, remove the polyethylene composite pipe, replace it with a new polyethylene pipe and repeat steps 1)-6).

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