A pulling cutting device for plastic pipe forming

Abstract

The application discloses a traction cutting equipment for plastic pipe forming and relates to the technical field of plastic processing, aiming to solve the technical problem that the current traction cutting equipment adopts plane ring cutting, stress is easily concentrated, and the pipe cutting part is easily cracked and deformed due to stress. The traction cutting equipment comprises a traction equipment. Through the design of a cutting driving structure, a cutter head mounting structure and a deformable cutter head, the shaping of the annular and wave motion trajectory of the cutter head, and the cooperation of the cutter head, the annular path and the axial wave fluctuation composite cutting trajectory of the cutter head are synchronously formed; the stress concentration in the wave-shaped cutting is dispersed. Through the cooperation of the cutting driving structure, the cutter head mounting structure and the deformable cutter head, and through the three-dimensional wave-shaped cutting trajectory, the stress residual problem of traditional cutting is solved, the adaptability of subsequent pipe processing is optimized, and the comprehensive performance of the plastic pipe traction cutting is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of plastic processing technology, and more specifically, to a traction cutting device for forming plastic pipes. Background Technology

[0002] Plastic pipes are a core basic material in construction, municipal engineering, chemical industry, water conservancy, and communications. Their production efficiency, dimensional accuracy, and end-face quality directly determine the reliability of downstream applications. With the continuous growth of global demand for plastic pipes and the diversification of pipe materials and specifications, traction cutting equipment, as a key downstream process in plastic pipe extrusion molding production lines, is deeply intertwined with industry needs, becoming a core element determining the automation level, product qualification rate, and production capacity of the production line. During traction cutting, the pipe is transported by the traction equipment, which simultaneously moves the cutting equipment, completing the cutting process in motion. This achieves continuous plastic pipe cutting. Throughout the cutting process, the pipe is continuously subjected to certain compressive stress. This stress is easily released during a single cut, leading to burrs, chipping, and micro-cracks at the cut edge. Especially for brittle pipes, stress concentration can directly cause localized fragmentation of the cut, compromising edge integrity.

[0003] However, existing traction cutting equipment often uses a planar annular cutting method. This method concentrates the cutting force in a localized area of ​​the cut, exacerbating stress concentration during the cutting process. This results in a large amount of residual stress at the pipe cut that is difficult to eliminate, which can easily lead to pipe deformation and cracking, affecting the overall structural stability. Furthermore, the planar annular cut has a simple contact surface shape, resulting in poor sealing with connecting components. This can easily lead to leakage problems in fluid transport scenarios, failing to meet the requirements for high precision and high sealing performance, and the sealing performance is generally mediocre. Therefore, we propose a traction cutting device for plastic pipe forming. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art, adapt to practical needs, and provide a traction cutting device for plastic pipe forming, so as to solve the technical problem that the current traction cutting device adopts planar circumferential cutting, which easily concentrates stress and causes the pipe cut to be easily affected by stress and cracked and deformed.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a traction cutting device for forming plastic pipes, comprising a traction device and a cutting system disposed on one side thereof;

[0006] The cutting system includes a circumferential cutting assembly, which includes a mounting ring, a cutting drive structure, a ring plate, a cutter head mounting structure, and a deformable cutter head.

[0007] The cutting drive structure is located inside the mounting ring, and the ring plate is located on the drive part of the cutting drive structure;

[0008] The cutter head mounting structure includes a third telescopic drive, a mounting bracket, a fourth telescopic drive, and a mounting base. A plurality of the third telescopic drives are mounted equidistantly in a ring on a ring plate. A plurality of the mounting brackets are respectively mounted on the output ends of the plurality of third telescopic drives. A plurality of the fourth telescopic drives are respectively mounted on the plurality of mounting brackets. A plurality of mounting bases are respectively disposed on the output ends of the plurality of fourth telescopic drives, and the plurality of mounting bases are respectively movably connected to the plurality of mounting brackets. A plurality of deformable cutter heads are respectively disposed on the output ends of the plurality of fourth telescopic drives.

[0009] Several of the deformable cutting heads form an annular wave-shaped cutting trajectory through the cutting drive structure and the fourth telescopic drive.

[0010] Preferably, the cutting system further includes a follow-up component and a straightening component;

[0011] The follower component includes a first slide groove, a follower plate, and a second slide groove. The follower plate is slidably connected in the first slide groove, and the second slide groove is disposed on the follower plate.

[0012] The straightening assembly includes a fixed pipe clamp, a first telescopic drive, and a movable pipe clamp. The fixed pipe clamp and the first telescopic drive are both mounted on the follower plate. The movable pipe clamp is mounted on the output end of the first telescopic drive and is slidably connected in the second slide groove.

[0013] The circumferential cutting assembly is located between the fixed pipe clamp and the movable pipe clamp, and the circumferential cutting assembly is mounted on the follower plate.

[0014] Preferably, the follow-up component further includes a pushing device;

[0015] The pushing device is installed on the first slide groove, and the pushing device is used to push the follower plate to reset after sliding in the first slide groove.

[0016] Preferably, the cutting drive structure includes a first rotary drive unit, a drive wheel, a transmission wheel, a second telescopic drive, a follower wheel, a V-groove, a gear, and a gear ring;

[0017] The first rotary drive unit is mounted on the mounting ring. The drive wheel is mounted on the output end of the first rotary drive unit. The transmission wheel is mounted on the output end of the second telescopic drive, which is also mounted on the mounting ring. Both the drive wheel and the follower wheel have V-shaped grooves, and the V-shaped grooves are adapted to the V-shaped protrusions on the outer side of the transmission wheel. The follower wheel is rotatably connected inside the mounting ring. The gear is mounted on the follower wheel. The gear ring is rotatably connected to the mounting ring, and the gear ring meshes with the gear. The top end of the gear ring passes through the mounting ring and is connected to the ring plate.

[0018] Preferably, when the transmission wheel is at the beginning stroke of the second telescopic drive, the drive wheel and the follower wheel are rotatably connected through the transmission wheel; when the transmission wheel is at the end stroke of the second telescopic drive, the transmission wheel disengages from the drive wheel and the follower wheel.

[0019] Preferably, the mounting ring has a cutting drive structure on both the inner and outer rings, and the first rotation drive unit of the two cutting drive structures is a high-speed motor and a low-speed motor, respectively. The output ends of the two cutting drive structures are respectively connected to the two ring plates, and the two ring plates are connected by a connecting structure.

[0020] Preferably, the deformable cutter head includes a cutter body, a second rotary drive unit, a telescopic groove, a screw, a movable cutter, and a fixed cutter;

[0021] The second rotary drive unit is installed inside the blade body. The telescopic groove is opened at the front end of the blade body. One end of the screw is installed at the output end of the second rotary drive unit and is rotatably connected in the telescopic groove. The movable blade is threadedly connected to the screw and is slidably connected in the telescopic groove. The fixed blade is installed at the front end of the blade body.

[0022] Preferably, the deformable cutter head has a first deformable state and a second deformable state. In the first deformable state, the movable cutter extends and is used for wide-width cutting of the pipe. In the second deformable state, the movable cutter retracts and is used for narrow-width cutting of the pipe.

[0023] Preferably, the connection structure includes a bracket, a fifth telescopic drive, and a connecting plate;

[0024] The bracket is mounted on the outer ring plate, the fifth telescopic drive is mounted on the bracket, the connecting plate is mounted on the output end of the fifth telescopic drive, and the connecting plate is inserted into the slot of the two ring plates.

[0025] Preferably, the two ring plates are provided with a processing structure, the processing structure including a sixth telescopic drive, a scraping wheel and a debris extraction device;

[0026] The sixth telescopic drive is mounted on the inner ring plate, the scraping wheel is mounted on the output end of the sixth telescopic drive and is slidably connected to the inner ring plate, and the debris extraction device is mounted on the outer ring plate.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. This invention, through the design of a cutting drive structure, a cutter head mounting structure, and a deformable cutter head, provides a stable reference for the circular motion of the cutter head. The cutter head mounting structure precisely shapes the cutter head's motion trajectory. Together, these two components enable the cutter head to synchronously form a composite cutting trajectory of a circular path and axial wave-like undulations. The wave-shaped cut disperses stress concentration during the cutting process, preventing cracking and deformation of the pipe cut edge caused by a single flat cut, making it particularly suitable for plastic pipes with high toughness or high brittleness. It also increases the contact area of ​​the cut, providing a more stable connection foundation for subsequent pipe splicing and sealing, improving assembly sealing and structural strength. This invention, through the synergy of the cutting drive structure, cutter head mounting structure, and deformable cutter head, upgrades the cutting trajectory from a planar circular shape to a three-dimensional wave-shaped shape. This solves the stress residue problem of traditional cutting, optimizes the adaptability of subsequent pipe processing, and significantly improves the overall performance of plastic pipe traction cutting.

[0029] 2. This invention, through the collaborative design of the follow-up component and the straightening component, applies a balanced clamping force radially to the pipe by using the opposing clamping of the fixed and movable pipe clamps of the straightening component. This not only corrects slight bending that occurs during pipe traction but also fixes the pipe in a straight stress state before cutting, dispersing local stress concentration. The circumferential cutting component is precisely positioned between the two sets of clamps, ensuring that both ends of the pipe are firmly clamped during cutting. The cutting force acts only on the local cutting area, and because the overall force is balanced, no additional torque or thrust is generated, further preventing pipe bending due to uneven force. This invention, through the collaborative design of the follow-up component and the straightening component, optimizes the stress state of the pipe, ensures the stability of the cutting process, effectively avoids pipe bending caused by pressure accumulation, and significantly improves the cutting accuracy and finished product quality of plastic pipes.

[0030] 3. This invention utilizes a synergistic design of a cutting drive structure and a deformable cutter head. The cutting drive structure, centered on a dual-speed motor and gear transmission, forms a switchable power output system, providing a suitable speed range for multiple cyclic cutting. High-speed cutting can quickly release surface stress initially, while low-speed cutting can precisely control the stress transmission rhythm during deep cutting. In the first deformable state of the deformable cutter head, the wide-width cutting structure utilizes a larger cutting contact area to initially disperse surface stress in the pipe. In the second deformable state, the narrow-width cutting gradually penetrates deeper into the pipe, releasing residual stress in layers. Through the dual-speed switching of the cutting drive structure and the cyclic switching of the deformable cutter head's state, multiple alternating processes of high-speed wide cutting and low-speed narrow cutting can be achieved. In each cycle, high-speed cutting quickly breaks the stress balance, while low-speed cutting finely guides the newly generated stress. After multiple cycles, the accumulated stress inside the pipe is continuously reduced, ultimately minimizing the stress in the cut area. This invention, through its switchable power, deformable cutter head, and cyclical cutting design, achieves continuous stress reduction in pipes throughout the entire process, from processing rhythm and cutting range to stress relief. It effectively solves the problems of stress concentration and residue caused by traditional single cutting, and significantly improves the structural stability of plastic pipes after cutting.

[0031] 4. This invention utilizes a collaborative design between the connecting structure and the processing structure in the ring-cutting assembly. This detachable rigid connection design allows for the independent driving of a single ring plate when control of the processing structure is required. The processing structure can be driven independently by two ring plates. After the secondary cutting is completed, the scraping wheel precisely fits against the cut edge to instantly scrape away the burrs and flash generated during cutting. These burrs not only affect the appearance of the pipe and its compatibility with subsequent connections, but also often retain local stress at their roots. The scraping process effectively eliminates these stress concentration points, preventing the pipe from cracking due to stress release during subsequent use. Simultaneously, the debris extraction device on the outer ring plate can be activated to promptly extract plastic debris generated during cutting and scraping. This prevents debris from accumulating at the cut edge and affecting the scraping effect, and also prevents additional stress from friction between debris and the pipe surface, ensuring the integrity of the pipe surface. This invention, through the coordinated design of the connecting structure and the processing structure in the circumferential cutting assembly, enables the cutting drive structure to drive the processing structure to eliminate residual stress and potential damage through scraping, burr removal, and debris cleaning. This effectively solves the problems of stress concentration at the cut, burr residue, and debris contamination in traditional cutting equipment, and is suitable for the molding and processing needs of high-quality plastic pipes. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the present invention.

[0033] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0034] Figure 3 This is a schematic diagram of the cutting system of the present invention.

[0035] Figure 4 This is a schematic diagram of the structure of the follower component and the straightening component of the present invention.

[0036] Figure 5 This is a bottom view of the follower plate structure of the present invention.

[0037] Figure 6 This is a schematic diagram of the structure of the circumferential cutting component of the present invention.

[0038] Figure 7 This is a schematic diagram of the cutting drive structure of the present invention.

[0039] Figure 8 This is a schematic diagram of the structure of the first rotary drive unit of the cutting drive structure of the present invention.

[0040] Figure 9 This is a schematic diagram of the structure in a single deformation state of the present invention.

[0041] Figure 10 This is a schematic diagram of the structure in the secondary deformation state of the present invention.

[0042] Figure 11 This is a schematic diagram of the pipe structure after being cut and shaped according to the present invention.

[0043] Figure 12 This is a schematic diagram illustrating the cutting process of the pipe during multiple cutting operations according to the present invention.

[0044] Explanation of the labels in the diagram:

[0045] 1. Traction equipment; 2. Cutting system; 3. Follow-up assembly; 4. Straightening assembly; 5. Ring cutting assembly;

[0046] 301. First slide rail; 302. Follower plate; 303. Second slide rail; 304. Pushing device;

[0047] 401. Fixed pipe clamp; 402. First telescopic drive; 403. Movable pipe clamp;

[0048] 501. Mounting ring; 502. Cutting drive structure; 503. Ring plate; 504. Cutter head mounting structure; 505. Deformable cutter head; 506. Connecting structure; 507. Processing structure;

[0049] 5021, First rotary drive unit; 5022, Drive wheel; 5023, Transmission wheel; 5024, Second telescopic drive; 5025, Follower wheel; 5026, V-groove; 5027, Gear; 5028, Gear ring;

[0050] 5041, Third telescopic drive; 5042, Mounting bracket; 5043, Fourth telescopic drive; 5044, Mounting base;

[0051] 5051, Blade body; 5052, Second rotary drive unit; 5053, Telescopic groove; 5054, Screw; 5055, Movable blade; 5056, Fixed blade;

[0052] 5061, bracket; 5062, fifth telescopic drive; 5063, connecting plate;

[0053] 5071, Sixth telescopic drive; 5072, Scraper wheel; 5073, Debris extraction device. Detailed Implementation

[0054] Examples, such as Figures 1 to 6 and Figure 11 As shown, the present invention relates to a traction cutting device for forming plastic pipes, comprising a traction device 1 and a cutting system 2 disposed on one side thereof; the cutting system 2 includes a ring cutting assembly 5, which includes a mounting ring 501, a cutting drive structure 502, a ring plate 503, a cutter head mounting structure 504, and a deformable cutter head 505; the cutting drive structure 502 is disposed inside the mounting ring 501, and the ring plate 503 is disposed on the drive part of the cutting drive structure 502; the cutter head mounting structure 504 includes a third telescopic drive 5041, a mounting bracket 5042, a fourth telescopic drive 5043, and a mounting base 5044, wherein the four third telescopic drives 5041, 5042, 5043, and 5044 are respectively. 41 are equidistantly arranged in a ring on the ring plate 503. Four mounting brackets 5042 are respectively mounted on the output ends of the four third telescopic drives 5041. Four fourth telescopic drives 5043 are respectively mounted on the four mounting brackets 5042. Four mounting seats 5044 are respectively located on the output ends of the four fourth telescopic drives 5043, and the four mounting seats 5044 are movably connected to the four mounting brackets 5042. Four deformable cutter heads 505 are respectively located on the output ends of the four fourth telescopic drives 5043. The four deformable cutter heads 505 form a ring-shaped wave-shaped cutting trajectory through the cutting drive structure 502 and the fourth telescopic drives 5043.

[0055] This invention innovatively constructs a ring-shaped wave-like cutting trajectory through the precise coordination of the cutting drive structure 502, the cutter head mounting structure 504, and the deformable cutter head 505. This overcomes the limitations of traditional ring-shaped flat cutting and significantly improves the safety and subsequent adaptability of plastic pipe cutting. The cutting drive structure 502 provides the basic power for trajectory shaping, driving the ring plate 503 to rotate at a constant speed, providing a stable reference for the ring motion of the deformable cutter head 505. The cutter head mounting structure 504 achieves precise shaping of the cutter head's motion trajectory through the dual control of the third telescopic drive 5041 and the fourth telescopic drive 5043. The third telescopic drive 5041 can adjust the radial extension distance of the cutter head. The fourth telescopic drive 5043 controls the axial feed depth of the cutter head. Together with the rotational motion of the cutting drive structure 502, these two components enable the four cutters to synchronously form a composite cutting trajectory of annular path and axial wave-like undulations. This annular wave-shaped cutting trajectory has significant advantages over the traditional flat cutting trajectory: firstly, the wave-shaped cut can disperse stress concentration during the cutting process, avoiding cracking and deformation of the pipe cut edge caused by a single flat cut, especially suitable for plastic pipes with high toughness or high brittleness; secondly, the wave-shaped structure can increase the contact area of ​​the cut, providing a more stable connection foundation for subsequent pipe splicing and sealing, improving assembly sealing and structural strength. Simultaneously, the equidistant annular layout of the four cutters ensures the uniformity of the wave-shaped trajectory. The stable transmission of the cutting drive structure 502 and the precise control of the telescopic drive guarantee the consistency of each wave pattern, avoiding the impact of trajectory deviation on cutting quality. This invention upgrades the cutting trajectory from a planar ring shape to a three-dimensional wave shape through the synergy of the cutting drive structure 502, the cutter head mounting structure 504, and the deformable cutter head 505. This not only solves the problem of residual stress in traditional cutting but also optimizes the adaptability of subsequent pipe processing, significantly improving the overall performance of plastic pipe traction cutting.

[0056] Specifically, such as Figures 1 to 5 As shown, the cutting system 2 of the present invention further includes a follower component 3 and a straightening component 4; the follower component 3 includes a first slide groove 301, a follower plate 302 and a second slide groove 303, the follower plate 302 is slidably connected in the first slide groove 301, and the second slide groove 303 is disposed on the follower plate 302; the straightening component 4 includes a fixed pipe clamp 401, a first telescopic drive 402 and a movable pipe clamp 403, the fixed pipe clamp 401 and the first telescopic drive 402 are both mounted on the follower plate 302, the movable pipe clamp 403 is mounted on the output end of the first telescopic drive 402, and the movable pipe clamp 403 is slidably connected in the second slide groove 303; the circumferential cutting component 5 is located at the middle of the fixed pipe clamp 401 and the movable pipe clamp 403, and the circumferential cutting component 5 is disposed on the follower plate 302.

[0057] The follower assembly 3 also includes a pushing device 304; the pushing device 304 is installed on the first slide groove 301 and is used to push the follower plate 302 to reset after sliding in the first slide groove 301.

[0058] This invention effectively solves the problem of pipe bending caused by pressure accumulation in traditional traction cutting equipment through the coordinated design of the follower component 3 and the straightening component 4. In traditional equipment, the traction device 1 continuously pushes the pipe forward during cutting, and the cutting device needs to fix the pipe and cut it during the pipe's movement. This cutting method causes the pipe to be subjected to reverse forces between the fixed end and the traction end, and the pressure continuously accumulates in the cutting area, which in turn causes the pipe to bend and deform, affecting the cutting accuracy and pipe quality. This invention, however, uses the opposing clamping of the fixed pipe clamp 401 and the movable pipe clamp 403 of the straightening component 4 to apply a balanced clamping force radially to the pipe. This not only corrects the slight bending that has occurred during the pipe traction process, but also fixes the pipe in a straight force state before cutting, dispersing local stress concentration. The circumferential cutting component 5 is precisely positioned between the two sets of clamps. During cutting, both ends of the pipe are firmly clamped, and the cutting force only acts on the local cutting area. Moreover, because the overall force is balanced, no additional torque or thrust is generated, further preventing the pipe from bending due to uneven force. This invention, through the collaborative design of the follow-up component 3 and the straightening component 4, optimizes the stress state of the pipe, ensures the stability of the cutting process, effectively avoids the pipe bending problem caused by pressure accumulation, and significantly improves the cutting accuracy and finished product quality of plastic pipes.

[0059] It is worth noting that, such as Figures 6 to 8 and Figure 12 As shown, the cutting drive structure 502 of the present invention includes a first rotary drive unit 5021, a drive wheel 5022, a transmission wheel 5023, a second telescopic drive 5024, a follower wheel 5025, a V-groove 5026, a gear 5027, and a gear ring 5028; the first rotary drive unit 5021 is mounted on a mounting ring 501, the drive wheel 5022 is mounted on the output end of the first rotary drive unit 5021, and the transmission wheel 5023 is mounted on the output end of the second telescopic drive 5024, and the second telescopic drive... 5024 is installed on the mounting ring 501. Both the drive wheel 5022 and the follower wheel 5025 have V-shaped grooves 5026, and the V-shaped grooves 5026 are adapted to the V-shaped protrusions on the outside of the transmission wheel 5023. The follower wheel 5025 is rotatably connected in the mounting ring 501. The gear 5027 is installed on the follower wheel 5025. The gear ring 5028 is rotatably connected to the mounting ring 501, and the gear ring 5028 is meshed with the gear 5027. The top of the gear ring 5028 passes through the mounting ring 501 and is connected to the ring plate 503.

[0060] When the transmission wheel 5023 is at the beginning stroke of the second telescopic drive 5024, the drive wheel 5022 and the follower wheel 5025 are rotatably connected through the transmission wheel 5023; when the transmission wheel 5023 is at the end stroke of the second telescopic drive 5024, the transmission wheel 5023 disengages from the drive wheel 5022 and the follower wheel 5025.

[0061] The mounting ring 501 has a cutting drive structure 502 on both the inner and outer rings. The first rotation drive unit 5021 of the two cutting drive structures 502 is a high-speed motor and a low-speed motor, respectively. The output ends of the two cutting drive structures 502 are connected to the two ring plates 503, and the two ring plates 503 are connected by a connecting structure 506.

[0062] The deformable cutter head 505 includes a cutter body 5051, a second rotary drive unit 5052, a telescopic groove 5053, a screw 5054, a movable cutter 5055, and a fixed cutter 5056. The second rotary drive unit 5052 is installed inside the cutter body 5051. The telescopic groove 5053 is opened at the front end of the cutter body 5051. One end of the screw 5054 is installed at the output end of the second rotary drive unit 5052 and is rotatably connected to the telescopic groove 5053. The movable cutter 5055 is threadedly connected to the screw 5054 and is slidably connected to the telescopic groove 5053. The fixed cutter 5056 is installed at the front end of the cutter body 5051.

[0063] It is worth noting that in this embodiment, the first rotary drive unit 5021 and the second rotary drive unit 5052 are both conventional deceleration drive structures in the prior art, and will not be described in detail here.

[0064] The deformable cutter head 505 has a first deformable state and a second deformable state. In the first deformable state, the movable cutter 5055 extends out and is used for wide-width cutting of the pipe. In the second deformable state, the movable cutter 5055 retracts and is used for narrow-width cutting of the pipe.

[0065] This invention, through the synergistic design of the cutting drive structure 502 and the deformable cutter head 505, constructs a stress reduction mechanism of dual-speed drive, state switching, and cyclic cutting, realizing multiple cyclic processing of pipelines to continuously disperse and release accumulated stress during the cutting process. The cutting drive structure 502, with a dual-speed motor and gear 5027 as its core, forms a switchable power output system: when the transmission wheel 5023 is in the initial stroke, the drive wheel 5022 driven by the high-speed motor drives the follower wheel 5025 to rotate through the transmission wheel 5023, and then through the gear 5027... 027 meshes with the gear ring 5028 to drive the ring plate 503, which in turn drives the deformable cutter head 505 to perform the initial cut at high speed. When the transmission wheel 5023 switches to the end stroke and disengages from the transmission, the low-speed motor drives the cutting structure to start, which drives the ring plate 503 to rotate at low speed. The connecting structure 506 ensures the coordinated movement of the two ring plates 503. This dual-speed drive switching provides a suitable speed basis for multiple cyclic cutting. High-speed cutting can quickly complete the initial release of surface stress, while low-speed cutting can accurately control the stress transmission rhythm in deep cutting.

[0066] The deformable cutter head 505 controls the extension and retraction of the movable cutter 5055 through the second rotary drive unit 5052, realizing flexible switching between the first and second deformation states: In the first deformation state, the movable cutter 5055 extends to form a wide cutting structure with the fixed cutter 5056, and completes a cut with high-speed rotation, using a larger cutting contact area to initially disperse the stress on the surface of the pipe; In the second deformation state, the movable cutter 5055 retracts, and only the fixed cutter 5056 participates in the cutting, and performs a second cut with low-speed rotation, using narrow-width cutting to gradually penetrate into the pipe and release residual stress in layers. Through the dual-speed switching of the cutting drive structure 502 and the cyclic switching of the deformable cutter head 505, multiple alternating processes of high-speed wide cutting and low-speed narrow cutting can be realized; In each cycle, high-speed cutting quickly breaks the stress balance, while low-speed cutting finely guides the newly generated stress. After multiple cycles, the accumulated stress inside the pipe is continuously reduced, ultimately minimizing the stress in the cutting area.

[0067] Furthermore, the precise fit between the V-shaped groove 5026 and the V-shaped protrusion ensures the stability of power transmission during the switching process of the drive wheel 5023, avoiding sudden stress changes caused by power interruption or fluctuation. The meshing transmission between the gear 5027 and the gear ring 5028 ensures the consistency of the rotation trajectory of the ring plate 503, resulting in a high degree of path overlap in multiple cyclic cuttings and preventing new stress concentration points from being generated due to trajectory deviation. Through the design of switchable power, deformable cutter head, and cyclic cutting, this invention achieves continuous reduction of pipeline stress throughout the entire process from processing rhythm and cutting range to stress relief, effectively solving the problems of stress concentration and residue caused by traditional single cutting, and significantly improving the structural stability of plastic pipes after cutting.

[0068] Furthermore, such as Figure 6 As shown, the connection structure 506 involved in this invention includes a bracket 5061, a fifth telescopic drive 5062, and a connecting plate 5063; the bracket 5061 is mounted on the outer ring plate 503, the fifth telescopic drive 5062 is mounted on the bracket 5061, and the connecting plate 5063 is mounted on the output end of the fifth telescopic drive 5062, and the connecting plate 5063 is inserted into the slots of the two ring plates 503.

[0069] The two ring plates 503 are provided with a processing structure 507, which includes a sixth telescopic drive 5071, a scraper wheel 5072 and a debris extraction device 5073. The sixth telescopic drive 5071 is installed on the inner ring plate 503, the scraper wheel 5072 is installed on the output end of the sixth telescopic drive 5071 and is slidably connected to the inner ring plate 503, and the debris extraction device 5073 is installed on the outer ring plate 503.

[0070] This invention, through the coordinated design of the connecting structure 506 and the processing structure 507 in the ring-cutting assembly 5, further enhances the stress relief effect of secondary cutting, while simultaneously achieving immediate and refined processing of the cut surface after cutting. It constructs an integrated processing system encompassing precise synchronous cutting, residual stress elimination, and efficient debris removal. The connecting structure 506 uses the bracket 5061 as a fixed foundation, and the extension and retraction of the connecting plate 5063 are controlled by the fifth telescopic drive 5062. When cutting is required, the connecting plate 5063 precisely inserts into the slots of the two ring plates 503, firmly connecting the outer ring plate 503 and the inner ring plate 503 into a whole. This detachable rigid connection design allows for the independent driving of a single ring plate 503 when the processing structure 507 needs to be controlled, improving the flexibility of equipment operation. The stability of synchronous rotation provides a fundamental guarantee for the progressive stress release of secondary cutting, ensuring a uniform distribution of cutting forces between the two cuts, further reducing pipe... The residual stress at the cut edge of the material; the treatment structure 507 can be driven independently by two ring plates 503, thus forming an effective solution to the stress hazards and processing environment problems after cutting: the sixth telescopic drive 5071 can push the scraping wheel 5072 to slide along the inner ring plate 503. After the secondary cutting is completed, the scraping wheel 5072 precisely fits the edge of the cut and immediately scrapes away the burrs and flash generated by the cutting. These burrs not only affect the appearance of the pipe and the compatibility of subsequent connections, but also often leave local stress at their roots. The scraping treatment can effectively eliminate these stress concentration points and prevent the pipe from cracking due to stress release during subsequent use. At the same time, the debris extraction device 5073 on the outer ring plate 503 can be started simultaneously to promptly extract the plastic debris generated during the cutting and scraping process. This not only prevents the debris from accumulating at the cut edge and affecting the scraping effect, but also prevents the debris from rubbing against the pipe surface and generating additional stress, thus ensuring the integrity of the pipe surface. The present invention, through the coordinated design of the connecting structure 506 and the processing structure 507 in the circumferential cutting component 5, enables the cutting drive structure 502 to drive the processing structure 507 to eliminate residual stress and potential damage through scraping and deburring, effectively solving the problems of cutting stress concentration, burr residue and deburr contamination in traditional cutting equipment, and adapting to the molding and processing needs of high-quality plastic pipes.

[0071] A method of using a traction cutting device for forming plastic pipes includes the following steps:

[0072] S1. Follow-up positioning and pipe straightening: Start the pushing device 304 of the follow-up component 3 to push the follow-up plate 302 to slide along the first slide groove 301 to the initial position adapted to the pipe traction speed. Start the first telescopic drive 402 of the straightening component 4 to push the movable pipe clamp 403 to move along the second slide groove 303 towards the fixed pipe clamp 401. The two sets of clamps clamp the pipe radially from opposite directions. The clamping force is preset according to the pipe material and diameter. During the clamping process, the slight bending generated during the pipe traction process is corrected by the balanced force of the two sets of clamps, so that the pipe maintains a straight force state in the cutting area, disperses the local stress concentration, and completes the pipe straightening and positioning. The traction device 1 pushes the pipe to move. The fixed pipe drives the follow-up plate 302 to move along the first slide groove through the two clamps.

[0073] S2. Initial High-Speed ​​Wide-Width Cut: After confirming the pipe is straightened, during the pipe movement, the first rotary drive unit 5021 corresponding to the high-speed motor in the cutting drive structure 502 is activated. Power is transmitted to the gear 5027 via the drive wheel 5022, transmission wheel 5023, and follower wheel 5025. Through the meshing of the gear 5027 and the gear ring 5028, the ring plate 503 is driven to rotate at a uniform speed. Simultaneously, the third telescopic drive 5041 and the fourth telescopic drive 5043 of the cutter head mounting structure 504 are activated. The third telescopic drive 5041 adjusts the radial extension distance of the deformable cutter head 505 to the outer wall of the pipe, and the fourth telescopic drive 5043 controls the axial feed of the cutter head according to the preset wave trajectory parameters. At the same time, the deformable cutter head 505 switches to the first deformation state, and the movable cutter 5055 extends to form a wide cutting structure with the fixed cutter 5056. Under the synergistic effect of rotational motion and telescopic drive, the four cutters form a ring-shaped wave cutting trajectory along the outer circumference of the pipe, completing the initial high-speed wide cut and initially dispersing the surface stress of the pipe.

[0074] S3. Dual-speed switching and secondary low-speed narrow cut: After the initial cut, the second telescopic drive 5024 is activated, pushing the transmission wheel 5023 along the mounting ring 501 to the end stroke, causing the transmission wheel 5023 to disengage from the drive wheel 5022 and the follower wheel 5025, disconnecting the power transmission of the high-speed motor. Then, the first rotary drive unit 5021 corresponding to the low-speed motor in the cutting drive structure 502 is activated, driving the ring plate 503 to rotate at low speed through another set of gears 5027 and gear ring 5028. The deformable cutter head 505 switches to the second deformable state, the movable cutter 5055 retracts, and only the fixed cutter 5056 participates in the cut. The fourth telescopic drive 5043 continues to control the axial feed of the cutter head according to the wave trajectory parameters, penetrating deep into the pipe to complete the secondary low-speed narrow cut, releasing residual stress layer by layer, ensuring the integrity and consistency of the wave-shaped cut structure. Then, steps S2 and S3 are repeated to cyclically cut the pipe.

[0075] S4. Cutting and Debris Removal: After the secondary cutting, maintain the low-speed rotation of the ring plate 503 and activate the sixth telescopic drive 5071 of the processing structure 507. This drives the scraping wheel 5072 to slide along the inner ring plate 503, ensuring precise contact between the scraping wheel 5072 and the cut edge. The scraping wheel then rotates and scrapes away the burrs and flash generated during cutting, eliminating localized stress concentration points at the burr roots. Simultaneously, the debris extraction device 5073 is activated. The suction port is aimed at the cutting and scraping area to immediately extract the generated plastic debris to the collection device, preventing debris accumulation from affecting the cut quality or causing additional stress due to friction with the pipe surface. The scraping and debris removal process lasts 30-60 seconds, ensuring a smooth cut without burrs or debris residue.

[0076] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. A pulling cutting apparatus for the forming of plastic pipe, characterized in that The cutting system (2) is arranged on one side of the traction device (1); The cutting system (2) comprises a ring cutting assembly (5), the ring cutting assembly (5) comprises a mounting ring (501), a cutting driving structure (502), a ring plate (503), a tool head mounting structure (504) and a deformable tool head (505); The cutting driving structure (502) is arranged in the mounting ring (501), and the ring plate (503) is arranged on a driving part of the cutting driving structure (502); The tool head mounting structure (504) comprises third telescopic drives (5041), mounting racks (5042), fourth telescopic drives (5043) and mounting seats (5044), a plurality of third telescopic drives (5041) are equidistantly arranged in a ring on the ring plate (503), a plurality of mounting racks (5042) are respectively arranged on output ends of the third telescopic drives (5041), a plurality of fourth telescopic drives (5043) are respectively arranged on the mounting racks (5042), a plurality of mounting seats (5044) are respectively arranged on output ends of the fourth telescopic drives (5043), and the mounting seats (5044) are movably connected to the mounting racks (5042), and a plurality of deformable tool heads (505) are respectively arranged on the output ends of the fourth telescopic drives (5043); The deformable tool heads (505) form a ring wave-shaped cutting track through the cutting driving structure (502) and the fourth telescopic drives (5043); The deformable tool head (505) comprises a tool body (5051), a second rotary driving unit (5052), a telescopic groove (5053), a screw rod (5054), a movable cutter (5055) and a fixed cutter (5056); The second rotary driving unit (5052) is arranged in the tool body (5051), the telescopic groove (5053) is arranged at a front end of the tool body (5051), one end of the screw rod (5054) is arranged on an output end of the second rotary driving unit (5052), and the screw rod (5054) is rotatably connected to the telescopic groove (5053), the movable cutter (5055) is threadedly connected to the screw rod (5054) and slidably connected to the telescopic groove (5053), and the fixed cutter (5056) is arranged at the front end of the tool body (5051); The deformable tool head (505) has a first deformation state and a second deformation state, in the first deformation state, the movable cutter (5055) is extended, the first deformation state is used for wide cutting of a pipeline, in the second deformation state, the movable cutter (5055) is retracted, and the second deformation state is used for narrow cutting of the pipeline.

2. A pulling cutting apparatus for forming plastic pipe according to claim 1, wherein The cutting system (2) further comprises a follow-up assembly (3) and a straightening assembly (4); The follow-up assembly (3) comprises a first sliding groove (301), a follow-up plate (302) and a second sliding groove (303), the follow-up plate (302) is slidably connected to the first sliding groove (301), and the second sliding groove (303) is arranged on the follow-up plate (302). The straightening assembly (4) comprises a fixed pipe clamp (401), a first telescopic drive (402) and a movable pipe clamp (403), the fixed pipe clamp (401) and the first telescopic drive (402) are both mounted on the follow-up plate (302), the movable pipe clamp (403) is mounted on the output end of the first telescopic drive (402), and the movable pipe clamp (403) is slidingly connected in the second sliding groove (303); The ring cutting assembly (5) is located at the middle of the fixed pipe clamp (401) and the movable pipe clamp (403), and the ring cutting assembly (5) is arranged on the follow-up plate (302).

3. A pulling cutting apparatus for use in the forming of plastic pipe according to claim 2, wherein, The follow-up assembly (3) further comprises a pushing device (304); The pushing device (304) is mounted on the first sliding groove (301), and the pushing device (304) is used for resetting the follow-up plate (302) after the follow-up plate (302) slides in the first sliding groove (301).

4. A pulling cutting apparatus for plastic pipe forming according to claim 1, wherein The cutting drive structure (502) comprises a first rotary drive unit (5021), a driving wheel (5022), a transmission wheel (5023), a second telescopic drive (5024), a follow-up wheel (5025), a V-shaped groove (5026), a gear (5027) and a gear ring (5028); The first rotary drive unit (5021) is mounted on the mounting ring (501), the driving wheel (5022) is mounted on the output end of the first rotary drive unit (5021), the transmission wheel (5023) is mounted on the output end of the second telescopic drive (5024), and the second telescopic drive (5024) is mounted on the mounting ring (501), the driving wheel (5022) and the follow-up wheel (5025) are both provided with V-shaped grooves (5026), and the V-shaped grooves (5026) are matched with V-shaped protrusions on the outer side of the transmission wheel (5023), the follow-up wheel (5025) is rotatably connected in the mounting ring (501), the gear (5027) is mounted on the follow-up wheel (5025), the gear ring (5028) is rotatably connected on the mounting ring (501), and the gear ring (5028) is in meshing connection with the gear (5027), and the top end of the gear ring (5028) penetrates through the mounting ring (501) and is connected on the ring plate (503).

5. A pulling cutting apparatus for use in the forming of plastic pipe according to claim 4 wherein, When the transmission wheel (5023) is at the initial stroke of the second telescopic drive (5024), the driving wheel (5022) and the follow-up wheel (5025) are rotatably connected through the transmission wheel (5023); when the transmission wheel (5023) is at the terminal stroke of the second telescopic drive (5024), the transmission wheel (5023) is separated from the driving wheel (5022) and the follow-up wheel (5025).

6. A pulling cutting apparatus for use in the forming of plastic pipe according to claim 4 wherein, The mounting ring (501) is provided with the cutting drive structure (502) on the inner ring and the outer ring, the first rotary drive units (5021) of the two cutting drive structures (502) are high-speed motors and low-speed motors respectively, the output ends of the two cutting drive structures (502) are connected with two ring plates (503) respectively, and the two ring plates (503) are connected through a connecting structure (506).

7. A pulling cutting apparatus for use in the forming of plastic pipe according to claim 6 wherein, The connecting structure (506) comprises a support (5061), a fifth telescopic drive (5062) and a connecting plate (5063); The support (5061) is installed on the outer ring plate (503), the fifth telescopic drive (5062) is installed on the support (5061), the connecting plate (5063) is installed on the output end of the fifth telescopic drive (5062), and the connecting plate (5063) is inserted into the slot of the two ring plates (503).

8. A pulling cutting apparatus for plastic pipe forming according to claim 6, wherein Two ring plates (503) are provided with a processing structure (507), and the processing structure (507) comprises a sixth telescopic drive (5071), a scraping wheel (5072) and a debris extraction device (5073); The sixth telescopic drive (5071) is installed on the inner ring plate (503), the scraping wheel (5072) is installed on the output end of the sixth telescopic drive (5071), and the scraping wheel (5072) is slidingly connected to the inner ring plate (503), and the debris extraction device (5073) is installed on the outer ring plate (503).

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