A pipe circumferential cutting device

Abstract

This utility model discloses a circumferential cutting device for pipes, belonging to the field of plastic pipe processing. It includes a drive mechanism, a cam ring, and a cutting tool mechanism. In the drive mechanism, a rotating bushing is rotatably mounted within a fixed plate mounting opening. The cam ring is fixed to the fixed plate, and its inner wall has a cam-shaped profile surface. The cutting tool mechanism includes a tool holder that rotates synchronously with the rotating bushing and a radial cutting assembly. The radial cutting assembly includes an axially movable tool bar, with a cutting blade and a rotating component at its two ends, respectively. The rotating component is in contact with the cam ring profile surface. An elastic reset component is fitted on the tool bar, forcing the rotating component to always remain in contact with the profile surface. When the rotating bushing drives the tool holder to rotate, the rotating component moves along the cam profile surface, triggering the cutting blade to sequentially complete radial feed cutting and elastic reset retraction cycles within a single rotation cycle. This design automatically controls the cutting blade's feed and retraction through the cam trajectory, ensuring a smooth cut end face, preventing damage to the internal ropes of the pipe, and improving work efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of plastic pipe cutting technology, specifically relating to a pipe circumferential cutting device. Background Technology

[0002] In municipal engineering, communication cable protection and other fields, some plastic pipes (such as conduit pipes and corrugated pipes) have traction ropes embedded inside to assist in cable laying. These pipes need to be cut into sections during construction, but it is required to strictly avoid damaging the internal ropes during the cutting process, and at the same time ensure that the pipe end face is flat for subsequent connection.

[0003] Currently, the industry commonly uses manual hand-held cutting tools, which has the following significant drawbacks:

[0004] 1. Loss of control over cutting precision: Uneven manual force can easily lead to bevels or burrs on the pipe cut, and the flatness of the end face cannot meet the requirements, requiring secondary trimming.

[0005] 2. Rope protection failure: It is difficult for the operator to perceive the relative position of the cutter and the internal rope in real time during the cutting process. Especially in non-transparent pipes, the rope is easily cut or scratched due to excessive cutting depth. Utility Model Content

[0006] This invention addresses the aforementioned problems in the existing technology by proposing a circumferential pipe cutting device that ensures a smooth cutting surface and avoids damage to pipes and ropes.

[0007] This utility model can be achieved through the following technical solutions:

[0008] A pipe circumferential cutting device, comprising:

[0009] The driving mechanism includes a fixed plate with a mounting port and a rotating bushing rotatably disposed in the mounting port, wherein the rotating bushing has an axial through hole for the pipe to pass through;

[0010] A cam ring, which is connected to the fixed plate, has an inner wall with a cam-shaped profile surface;

[0011] The cutting tool mechanism includes a tool holder connected to the rotating bushing, and at least one set of radial cutting components. The tool holder has a cutting channel communicating with the axial through hole.

[0012] The radial cutting assembly includes:

[0013] A cutter bar is axially movable and connected to the cutter holder. One end of the cutter bar is provided with a cutter and extends into the cutting channel, and the other end is provided with a rotating component that rolls with the contour surface.

[0014] An elastic reset unit is sleeved on the tool bar and its two ends abut against the tool bar and the tool holder, respectively, to provide elastic force to force the rotating part to always conform to the contour surface;

[0015] When the rotating bushing drives the tool holder to rotate, the rotating component moves along the contour surface, triggering the cutter to complete the cyclic action of radial infeed cutting and elastic reset retraction in a single rotation cycle.

[0016] As a further improvement of this utility model, the rotating component is configured as a bearing, which is mounted on the tool holder via an eccentric shaft. By rotating the eccentric shaft, the bearing is driven to rotate to adjust the distance between it and the contour surface.

[0017] As a further improvement of this utility model, the contour surface is provided with a recessed point, and when the bearing moves to the recessed point, the cutter separates from the surface of the pipe.

[0018] As a further improvement of this utility model, the number of cam rings is set to two, the recessed points of the two cam rings are symmetrically arranged, and the radial cutting components are correspondingly set in two sets and arranged symmetrically.

[0019] As a further improvement of this utility model, the driving mechanism further includes a driving cylinder and a rack. Meanwhile, one end face of the rotating bushing is set as a gear surface. The cylinder shaft of the driving cylinder is connected to the rack and is used to drive the rack to move axially. The gear surface meshes with the rack, and the driving cylinder drives the rotating bushing to rotate.

[0020] As a further improvement of this utility model, it also includes a pair of clamping mechanisms, respectively located on the front and rear sides of the driving mechanism, and used to clamp the front and rear sides of the pipe cutting surface. The clamping mechanisms include:

[0021] Mounting plate, which is connected to the fixing plate;

[0022] A retaining sleeve, used for the passage of pipes;

[0023] An elastic sleeve, which is axially slidable within the fixed sleeve, is used to clamp the pipe.

[0024] As a further improvement of this utility model, the end of the fixing sleeve away from the mounting plate is provided with an inner conical surface, and the clamping end of the elastic sleeve is provided with grooves distributed circumferentially to form a radially retractable clamping opening. When the elastic sleeve moves toward the inner conical surface, the clamping opening is compressed and contracted to clamp the pipe.

[0025] As a further improvement of this utility model, the clamping mechanism further includes a clamping cylinder and a driving block disposed on its piston rod. The driving block is provided with a wedge-shaped member, and the end of the elastic sleeve is provided with a wedge-shaped groove that cooperates with the wedge-shaped member.

[0026] As a further improvement of this utility model, a compression spring is fitted on the elastic sleeve. The two ends of the compression spring abut against the inner wall of the mounting plate and the end of the elastic sleeve, respectively, and always provide elastic force to the elastic sleeve in the direction of the driving block, so that the wedge-shaped member keeps in contact with the wedge-shaped groove.

[0027] As a further improvement of this utility model, it also includes a follower cylinder, wherein the mounting plate is connected to the cylinder shaft of the follower cylinder, and the follower cylinder is used to drive the entire pipe cutter to move synchronously with the pipe.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. Precise control of cutting depth and rope protection: By combining the cam ring profile with the rolling action of the elastic reset unit and the rotating part, precise control of the cutter's forward and backward movements is achieved. This design ensures that the cutting depth is strictly limited within the pipe wall thickness range, which can not only complete the cutting task efficiently, but also prevent the cutter from extending to the area that may touch the internal rope, significantly improving the safety and reliability of the cutting operation.

[0030] 2. Smooth cutting surface: Since the cutter completes the radial infeed and retraction cycle according to the preset trajectory in a single rotation cycle, and the cutting depth remains consistent, it can ensure the smoothness of the pipe end face after cutting. Compared with the bevel or burr problems that are easy to occur in traditional manual cutting, it can obtain a high-quality cutting end face in one go without subsequent trimming, which greatly improves work efficiency and product quality.

[0031] 3. Increased automation: The entire cutting process is completed automatically by mechanical mechanisms, reducing the impact of human factors. This not only improves cutting accuracy but also lowers the technical threshold for operators, further enhancing the practicality and applicability of the equipment.

[0032] 4. Stable clamping: The clamping jaws of the elastic sleeve contract under pressure, providing a full-around wrapping clamping method for the pipe, ensuring that the pipe remains highly stable throughout the entire cutting process and will not shift or vibrate.

[0033] 5. Follow-up cutting: The follow-up cylinder is used to drive the pipe cutter to move synchronously with the pipe, so that the pipe cutter has a follow-up function and can achieve circumferential cutting of the pipe while the pipe is being transported in a straight line. Attached Figure Description

[0034] Figure 1 This is an exploded view of the circumferential pipe cutting device of this utility model;

[0035] Figure 2 This is an exploded view of the circumferential pipe cutting device of this utility model from another perspective;

[0036] Figure 3 This is a schematic diagram of the assembled structure of the pipe circumferential cutting device of this utility model;

[0037] Figure 4 This is a schematic diagram of the pipe circumferential cutting device after assembly from another perspective.

[0038] Figure 5 This is a schematic diagram of the connection between the drive mechanism and the cutting tool mechanism of the pipe circumferential cutting device of this utility model;

[0039] Figure 6 This is a schematic diagram of the cutting tool mechanism of this utility model;

[0040] Figure 7 This is a schematic diagram of the structure of the eccentric shaft and the rotating component of this utility model after connection;

[0041] Figure 8 This is a schematic diagram of the structure of the two cam rings of this utility model after they are connected;

[0042] Figure 9 This is a cross-sectional view of one of the clamping mechanisms of this utility model.

[0043] In the diagram, 100 is the drive mechanism; 110 is the fixed plate; 120 is the rotating bushing; 121 is the gear surface; 130 is the drive cylinder; and 140 is the rack.

[0044] 200, Cam ring; 210, Profile surface; 220, Recessed point;

[0045] 300. Tool mechanism; 310. Tool holder; 320. Tool shank; 330. Cutting blade; 340. Rotating component; 341. Eccentric shaft; 350. Return spring;

[0046] 400 Clamping mechanism; 410 Mounting plate; 420 Fixing sleeve; 421 Inner conical surface; 430 Elastic sleeve; 431 Clamping jaw; 432 Wedge groove; 440 Clamping cylinder; 450 Drive block; 451 Wedge; 460 Compression spring;

[0047] 500, Follow-up cylinder;

[0048] 600. Pipes. Detailed Implementation

[0049] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. The technical methods of the present invention will be further described, but the present invention is not limited to these embodiments.

[0050] like Figures 1-9 As shown, this utility model provides a pipe circumferential cutting device, comprising:

[0051] The drive mechanism 100 includes a fixed plate 110 with an installation port and a rotating bushing 120 rotatably disposed in the installation port. The rotating bushing 120 has an axial through hole for the pipe 600 to pass through.

[0052] The cam ring 200 is connected to the fixed plate 110. The inner wall of the cam ring 200 has a profile surface 210 arranged in a cam shape. The design of the profile surface 210 is one of the key points, as it determines the radial feed and retraction action mode of the tool during rotation.

[0053] The cutting tool mechanism 300 includes a tool holder 310 connected to a rotating bushing 120, and at least one set of radial cutting components. The tool holder 310 has a cutting channel communicating with an axial through hole to ensure that the cutter 330 can accurately act on the surface of the pipe 600.

[0054] The radial cutting component is further subdivided into:

[0055] The tool holder 320 is axially movable and connected to the tool holder 310. One end of the tool holder 320 is provided with a cutter 330 and extends into the cutting channel, and the other end is provided with a rotating member 340 that rolls with the profile surface 210. As the rotating member 340 moves along the profile surface 210 of the cam ring 200, the radial advance or retraction of the cutter 330 is realized.

[0056] The elastic reset unit is configured as a reset spring 350, which is sleeved on the tool holder 320. Both ends of the reset spring 350 abut against the tool holder 320 and the tool support 310, respectively. The reset spring 350 provides elastic force to force the rotating component 340 to always conform to the contour surface 210, ensuring that the rotating component 340 can always move in conformity to the contour surface 210 of the cam ring 200.

[0057] In general, when the rotating bushing 120 drives the tool holder 310 to rotate, the rotating part 340 can move along the contour surface 210, triggering the cutter 330 to complete the cyclic action of radial feed cutting and elastic reset retraction in a single rotation cycle.

[0058] Specifically, the cutting action of the 600mm circumferential pipe cutting device provided in this embodiment can be described in detail as follows:

[0059] I. Initial State:

[0060] Before cutting is started, the cutter 330 in the tool mechanism 300 is in its initial position. At this time, the cutter 330 does not contact the surface of the pipe 600, and the rotating part 340 is located at the recessed point 220 of the inner wall contour surface 210 of the cam ring 200.

[0061] II. Drive mechanism 100 starts:

[0062] When the drive mechanism 100 starts working, the rotating bushing 120 drives the tool holder 310 connected to it to rotate. Since the tool holder 310 is connected to the radial cutting assembly, this causes the entire tool mechanism 300 to rotate around the tube 600.

[0063] III. Cutting process:

[0064] (1) As the tool holder 310 rotates, the rotating part 340 rolls along the contour surface 210 of the cam ring 200. Once the rotating part 340 disengages from the recessed point 220, it will push the tool bar 320 to move outward and make the cutter 330 gradually approach and eventually contact the surface of the pipe 600, thus realizing the cutting process.

[0065] (2) The elastic reset unit (e.g., a spring) provides the necessary elastic force to ensure that the rotating part 340 fits tightly against the profile surface 210 of the cam ring 200, thereby ensuring that the tool holder 320 and the cutter 330 can move along a predetermined trajectory.

[0066] IV. Cutting and Retraction Cycle:

[0067] (1) During a single rotation cycle, as the rotating bushing 120 continues to rotate, the rotating part 340 moves along the contour surface 210 of the cam ring 200, causing the cutter 330 to complete an action from approaching the surface of the pipe 600 to cutting deeply and then returning to the initial position during each rotation.

[0068] (2) When the rotating part 340 moves to the recessed point 220 on the contour surface 210, the cutter 330 separates from the surface of the pipe 600, realizing the retraction action and preparing for the next round of cutting cycle.

[0069] This automated circumferential pipe cutting device has at least the following advantages compared to existing methods that use manual pipe cutting:

[0070] 1. Precise control of cutting depth and rope protection: By combining the contour surface 210 of the cam ring 200 with the rolling action of the elastic reset unit and the rotating part 340, precise control of the forward and backward movement of the cutter 330 is achieved. This design ensures that the cutting depth is strictly limited within the 600mm wall thickness of the pipe, which can not only complete the cutting task efficiently, but also prevent the cutter 330 from extending into the area that may touch the internal rope, significantly improving the safety and reliability of the cutting operation.

[0071] 2. Smooth cutting surface: Since the cutter 330 completes the radial infeed and retraction cycle according to the preset trajectory in a single rotation cycle, and the cutting depth is always consistent, it can ensure the smoothness of the pipe end face after cutting. Compared with the bevel or burr problems that are easy to occur in traditional manual cutting, it can obtain a high-quality cutting end face in one go without subsequent trimming, which greatly improves work efficiency and product quality.

[0072] 3. Increased automation: The entire cutting process is completed automatically by mechanical mechanisms, reducing the impact of human factors. This not only improves cutting accuracy but also lowers the technical threshold for operators, further enhancing the practicality and applicability of the equipment.

[0073] Preferably, the rotating component 340 is configured as a bearing, which is mounted on the tool holder 320 via an eccentric shaft 341. Specifically, the design of the eccentric shaft 341 allows it to be offset by a certain distance relative to the center line of the tool holder 320, so that when the eccentric shaft 341 rotates, it can drive the bearing to make a corresponding radial displacement to adjust the distance between the bearing and the profile surface 210 of the cam ring 200.

[0074] This design allows the operator to fine-tune the maximum cutting depth of the cutter 330 by simply rotating the eccentric shaft 341, adapting to pipes 600 of different thicknesses or adjusting cutting parameters, without having to replace the entire cutter assembly or make complex mechanical adjustments, greatly improving the equipment's versatility and work efficiency.

[0075] Preferably, the number of cam rings 200 is set to two, and the recessed points 220 of the two cam rings 200 are symmetrically arranged. At the same time, two sets of radial cutting components are correspondingly provided and symmetrically distributed on the tool holder 310.

[0076] This design allows the two sets of radial cutting components to work together as the cutter 330 moves along the contour surface 210 of the cam ring 200, performing cutting operations at different positions on the pipe 600. Since the recessed points 220 of the two cam rings 200 are symmetrically set, the cutter 330 can complete the complete cut of the pipe 600 in less than one rotation stroke, significantly reducing the number of rotations required to complete the cut and greatly improving the cutting efficiency.

[0077] In addition, the two sets of cutters 330 act simultaneously on different positions of the pipe 600, which can effectively avoid the deviation that may occur at a single cutting point, ensuring that the cut end face is flatter and smoother, and meeting the application scenarios with high precision requirements.

[0078] Preferably, the drive mechanism 100 further includes a drive cylinder 130 and a rack 140. Meanwhile, one end face of the rotating bushing 120 is set as a gear surface 121. The cylinder shaft of the drive cylinder 130 is connected to the rack 140 and is used to drive the rack 140 to move axially. The gear surface 121 meshes with the rack 140, so that the drive cylinder 130 can drive the rotating bushing 120 to rotate and drive the tool mechanism 300 to rotate synchronously to complete the circumferential cutting of the pipe 600.

[0079] Preferably, it also includes a pair of clamping mechanisms 400, located on the front and rear sides of the drive mechanism 100 respectively, and used to clamp the front and rear sides of the cutting surface of the pipe 600, which can effectively prevent the pipe 600 from shifting or vibrating during the cutting process, and ensure the flatness of the cutting surface and the cutting accuracy.

[0080] Specifically, the clamping mechanism 400 includes:

[0081] Mounting plate 410, which is connected to fixed plate 110, provides a stable base support for the entire clamping mechanism 400;

[0082] The retaining sleeve 420 is used for the pipe 600 to pass through and guide the pipe 600 to accurately enter the cutting area. The end of the retaining sleeve 420 away from the mounting plate 410 is provided with an inner conical surface 421. This design helps to effectively perform subsequent clamping operations.

[0083] An elastic sleeve 430 is axially slidably disposed within a fixed sleeve 420 and used to clamp the pipe 600. The clamping end of the elastic sleeve 430 is provided with grooves distributed circumferentially, which make the clamping end form a radially retractable jaw 431. When the elastic sleeve 430 moves toward the inner conical surface 421 of the fixed sleeve 420, the jaw 431 is squeezed and contracted, thereby achieving a firm clamping of the pipe 600.

[0084] It should be noted that, since the clamping jaw 431 of the elastic sleeve 430 has the property of contraction after being compressed, it can adapt to pipes 600 of different diameters. Specifically, when the elastic sleeve 430 moves toward the inner conical surface 421 of the fixed sleeve 420, the circumferential groove design of its clamping end allows the clamping jaw 431 to perform appropriate radial contraction according to the actual size of the pipe 600, thereby achieving effective clamping of pipes 600 of various specifications.

[0085] Furthermore, this design goes beyond simple clamping; it uses a comprehensive, wrapping clamping method to ensure that the pipe 600 remains highly stable throughout the entire cutting process, without shifting or vibrating.

[0086] Furthermore, the clamping mechanism 400 also includes a clamping cylinder 440 and a drive block 450 disposed on its piston rod. The drive block 450 is provided with a wedge-shaped member 451, and the end of the elastic sleeve 430 is provided with a wedge-shaped groove 432 that cooperates with the wedge-shaped member 451. When the clamping cylinder 440 is working, its piston rod pushes the drive block 450 to move. Since the drive block 450 always moves in a straight line, as the wedge-shaped member 451 on the drive block 450 slides along the wedge-shaped groove 432, the elastic sleeve 430 can be pushed to move in its axial direction, thereby realizing the clamping or releasing of the elastic sleeve 430 on the pipe 600.

[0087] By designing the wedge 451 and the wedge groove 432, the linear motion of the cylinder is converted into the radial contraction action of the elastic sleeve 430 using mechanical principles, ensuring reliability and consistency during the clamping process.

[0088] In addition, in order to ensure that the wedge 451 and the wedge groove 432 always maintain good contact and that the elastic sleeve 430 can stably perform the clamping operation, a compression spring 460 is sleeved on the outside of the elastic sleeve 430. The two ends of the compression spring 460 abut against the inner wall of the mounting plate 410 and the end of the elastic sleeve 430 respectively, and always provide the elastic sleeve 430 with elastic force in the direction of the drive block 450.

[0089] This design ensures that the wedge 451 and the wedge groove 432 are always in close contact, avoiding loosening or separation. This ensures that the action of the clamping cylinder 440 can be effectively transmitted to the elastic sleeve 430 and cause it to move axially to switch the clamping or releasing of the pipe 600.

[0090] Furthermore, the compression spring 460 also serves as a buffer, ensuring that the elastic sleeve 430 and the wedge 451 always maintain appropriate contact pressure, reducing unnecessary wear and impact, and helping to extend the service life of key components of the equipment.

[0091] Preferably, it also includes a follower cylinder 500. The mounting plate 410 is connected to the cylinder shaft of the follower cylinder 500. The follower cylinder 500 is used to drive the entire pipe cutter 600 to move synchronously with the pipe 600, so that the entire pipe cutter 600 has a follower function and can perform circumferential cutting on the pipe 600 while the pipe 600 is being conveyed forward in a straight line.

[0092] The technical means disclosed in this utility model are not limited to those described above, but also include technical solutions composed of any combination of the above technical features. The above are specific embodiments of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

[0093] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0094] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0095] The technical solutions of the various embodiments of this utility model can be combined with each other, but only if they can be implemented by those skilled in the art. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

[0096] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A pipe girth cutting apparatus, characterised in that, include: The driving mechanism includes a fixed plate with a mounting port and a rotating bushing rotatably disposed in the mounting port, wherein the rotating bushing has an axial through hole for the pipe to pass through; A cam ring, which is connected to the fixed plate, has an inner wall with a cam-shaped profile surface; The cutting tool mechanism includes a tool holder connected to the rotating bushing, and at least one set of radial cutting components. The tool holder has a cutting channel communicating with the axial through hole. The radial cutting assembly includes: A cutter bar is axially movable and connected to the cutter holder. One end of the cutter bar is provided with a cutter and extends into the cutting channel, and the other end is provided with a rotating component that rolls with the contour surface. An elastic reset unit is sleeved on the tool bar and its two ends abut against the tool bar and the tool holder, respectively, to provide elastic force to force the rotating part to always conform to the contour surface; When the rotating bushing drives the tool holder to rotate, the rotating component moves along the contour surface, triggering the cutter to complete the cyclic action of radial infeed cutting and elastic reset retraction in a single rotation cycle.

2. A pipe circumferential cutting device according to claim 1, wherein The rotating component is configured as a bearing, which is mounted on the tool holder via an eccentric shaft. By rotating the eccentric shaft, the bearing is driven to rotate, thereby adjusting the distance between it and the contour surface.

3. The pipe circumferential cutting device according to claim 2, characterized in that, The contour surface has a recessed point. When the bearing moves to the recessed point, the cutter separates from the pipe surface.

4. The pipe circumferential cutting device according to claim 3, characterized in that, The number of cam rings is set to two, and the recessed points of the two cam rings are symmetrically arranged. At the same time, the radial cutting components are set to two sets and arranged symmetrically.

5. A pipe circumferential cutting device according to claim 1, characterized in that, The driving mechanism also includes a driving cylinder and a rack. One end face of the rotating bushing is set as a gear surface. The cylinder shaft of the driving cylinder is connected to the rack and is used to drive the rack to move axially. The gear surface meshes with the rack, and the driving cylinder drives the rotating bushing to rotate.

6. The pipe circumferential cutting device according to claim 1, characterized in that, It also includes a pair of clamping mechanisms, located on the front and rear sides of the drive mechanism respectively, for clamping the front and rear sides of the pipe cutting surface. The clamping mechanisms include: Mounting plate, which is connected to the fixing plate; A retaining sleeve, used for the passage of pipes; An elastic sleeve, which is axially slidable within the fixed sleeve, is used to clamp the pipe.

7. A pipe circumferential cutting device according to claim 6, characterized in that, The fixed sleeve has an inner conical surface at one end away from the mounting plate, and the clamping end of the elastic sleeve has grooves distributed circumferentially to form a radially retractable clamping opening. When the elastic sleeve moves toward the inner conical surface, the clamping opening is compressed and contracted to clamp the pipe.

8. A pipe circumferential cutting device according to claim 6, characterized in that, The clamping mechanism further includes a clamping cylinder and a drive block disposed on its piston rod. The drive block is provided with a wedge-shaped element, and the end of the elastic sleeve is provided with a wedge-shaped groove that cooperates with the wedge-shaped element.

9. A pipe circumferential cutting device according to claim 8, characterized in that, A compression spring is fitted onto the elastic sleeve. The two ends of the compression spring abut against the inner wall of the mounting plate and the end of the elastic sleeve, respectively, and always provide elastic force to the elastic sleeve in the direction of the driving block, so that the wedge-shaped member keeps in contact with the wedge-shaped groove.

10. A pipe circumferential cutting device according to claim 6, characterized in that, It also includes a follower cylinder, the mounting plate is connected to the cylinder shaft of the follower cylinder, and the follower cylinder is used to drive the entire pipe cutter to move synchronously with the pipe.

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