Pipe cutting apparatus and method of cutting

Abstract

The present application relates to a kind of pipeline cutting equipment and its cutting method, including chassis, support guard frame and discharge frame;The support guard frame and discharge frame are configured at the end of the outer periphery of chassis, wherein the support guard frame is loaded to cutting sword and is shielded to the waste chip generated by cutting point, and the support guard frame and discharge frame are adjacent, and the rolling frame is symmetrically installed on the chassis, and the rolling frame is auxiliary effect for the rotation of pipeline;The top end of the support guard frame has cutting sword in the extension and retraction movement, wherein cutting sword is used to cut pipeline processing. By the auxiliary limiting mechanism, support from inside the pipeline is provided to the outside, and in the cutting process, the cutting position is avoided to be concave or to be position deviation, to ensure the integrity of the incision and the overall accuracy of pipeline cutting.

Description

Technical Field

[0001] This invention belongs to the field of pipeline cutting technology, specifically a pipeline cutting device and its cutting method. Background Technology

[0002] Chinese Patent CN201721637242.7 discloses a pipe cutting device, which includes a frame, a sliding seat, a drive mechanism, and a cutting tool. The sliding seat is mounted on the frame, the drive mechanism is mounted on the sliding seat, a support arm is mounted on the sliding seat, a rotating shaft is mounted on the support arm, the cutting tool is mounted on the rotating shaft, and the drive mechanism drives the rotating shaft. During use, the drive mechanism drives the rotating shaft to rotate, which in turn drives the cutting tool to rotate, achieving cutting of the outer or inner wall of the pipe. It can cut the pipe in one pass, producing high-quality cuts comparable to lathe cutting, and has high efficiency.

[0003] In the aforementioned patent and current pipe cutting, when the cutting tool holder cuts the pipe, its force is concentrated on the outer wall of the pipe. At the moment of cutting, the cut is subjected to unidirectional radial force, which easily causes concave, elliptical deformation or wavy edge, resulting in uneven cut and out-of-roundness. This is especially serious for thin-walled pipes, often resulting in "cut collapse". Subsequent direct docking is not possible, and the pipe is prone to positional changes during cutting, making it difficult to ensure the safety of overall operation.

[0004] In view of this, a pipe cutting device and its cutting method are proposed. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] Given the following technical problems in the existing technology: When the cutting tool holder cuts the pipe, the force is concentrated on the outer wall of the pipe. At the moment of cutting, the cut is subjected to unidirectional radial force, which easily causes concave, elliptical deformation or wavy edge, resulting in uneven cut and out-of-roundness. This is especially serious for thin-walled pipes, often resulting in "cut collapse". Subsequent direct docking is not possible. Moreover, the pipe is prone to positional changes during cutting, making it difficult to ensure the safety of overall operation.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a pipe cutting device, comprising a base frame, a support and protective frame, and a discharge frame;

[0008] The support and protective frame and the discharge frame are configured at the outer periphery of the end of the base frame. The support and protective frame supports the cutting tool and shields the waste generated at the cutting point, thus providing a protective effect. The support and protective frame and the discharge frame are arranged adjacent to each other. Rolling frames are symmetrically installed on the base frame, and the rolling frames assist the rotation of the pipe.

[0009] The top inner edge of the support and protective frame has a cutting tool that can extend and retract, and the cutting tool is used to cut the pipe.

[0010] The discharge rack has a discharge port on one side and an extension seat on the other side. The extension seat facilitates the directional discharge of the cut portion of the pipe for unified management. A movable seat is slidably connected to both the discharge rack and the extension seat.

[0011] A bearing plate is installed at the upper end of the base frame, and a hydraulic cylinder is mounted on the bearing plate. A baffle plate is installed at the output end of the hydraulic cylinder. A linkage shaft is rotatably mounted on the inner edge of the baffle plate. The linkage shaft is smaller than the pipe specification to facilitate smooth entry into the pipe. An auxiliary limiting mechanism and an adjustment mechanism are installed on the linkage shaft. The auxiliary limiting mechanism is used to ensure the stability of the pipe during cutting, and the adjustment mechanism is used to change the state of the auxiliary limiting mechanism.

[0012] As a preferred technical solution for pipe cutting equipment, the discharge rack and the extension seat are jointly equipped with a lead screw and a guide rod. The lead screw is rotatably configured on the discharge rack and the extension seat, and the guide rod is fixedly configured on the discharge rack and the extension seat. The lead screw is used to change the position of the variable seat, and the guide rod is guided by a helical drive.

[0013] As a preferred technical solution for pipe cutting equipment, a pair of transmission seats are installed on the back of the variable seat. The pair of transmission seats are respectively threaded to the lead screw and slidably connected to the guide rod, so that the lead screw can drive the variable seat to perform telescopic movement when rotating. A bearing seat is installed on the upper surface of the variable seat, wherein the bearing seat is used to temporarily support the pipe after cutting.

[0014] As a preferred technical solution for pipe cutting equipment, the auxiliary limiting mechanism includes an inner bracket 1, an inner bracket 2, a guide channel, a toothed groove, and a gear. The surface of the linkage shaft is provided with a guide channel. The inner bracket 1 and the inner bracket 2 extend and retract within the guide channel. Multiple inner brackets 1 and 2 are arranged in a circumferential array. The number of guide channels is the same as the total number of inner brackets 1 and 2. The inner brackets 1 and 2 are used to abut against the inner edge of the pipe. This not only helps to prevent the cutting position from being crushed during cutting, but also facilitates the rotation of the pipe to ensure comprehensive and accurate cutting.

[0015] As a preferred technical solution for pipe cutting equipment, the linkage shaft has a toothed groove milled on the circumferential surface of one end outside the baffle plate. The gear is installed at the contour position of the baffle plate, and the gear and the toothed groove mesh for transmission. When the gear is controlled to rotate by another motor, it can drive the linkage shaft to rotate through the toothed groove, thereby driving the pipe to rotate and facilitating its full cutting.

[0016] As a preferred technical solution for pipe cutting equipment, both inner bracket one and inner bracket two are fixedly installed with limiting plates at one end of the linkage shaft. A spring is arranged between the limiting plate and the inner edge of the linkage shaft, wherein the spring can drive inner bracket one or inner bracket two to reset when no force is applied.

[0017] As a preferred technical solution for pipe cutting equipment, the adjustment mechanism includes a linkage roller, an acute-angle protrusion, a fan-shaped protrusion, and a passive protrusion. The linkage roller is hinged at the center of the linkage shaft. One end of the linkage roller extending out of the linkage shaft is connected to a servo motor, wherein the servo motor controls the rotation of the linkage roller. The servo motor is mounted on the linkage shaft via a bracket.

[0018] As a preferred technical solution for pipe cutting equipment, the surface of the linkage roller near the servo motor is provided with multiple fan-shaped protrusions, which are distributed in a 90° rotational arrangement from left to right. The surface of the linkage roller away from the servo motor is provided with multiple acute-angle protrusions, which are distributed in a 90° rotational arrangement from left to right.

[0019] As a preferred technical solution for pipe cutting equipment, both inner bracket one and inner bracket two have passive protrusions installed at one end of their extension into the linkage shaft. The thickness of the passive protrusions is 1 / 4 of the thickness of inner bracket one or inner bracket two, and multiple passive protrusions on inner bracket one or inner bracket two are staggered in a clockwise direction.

[0020] A pipe cutting method further includes the following steps:

[0021] S1. Adjust the pipe to the cutting zone position, control the hydraulic cylinder to move the baffle towards the pipe position, and smoothly enter the pipe. When the appropriate position is reached, control the servo motor to make the linkage roller rotate 180°. The linkage roller drives the acute-angle protrusion and the fan-shaped protrusion to rotate. The fan-shaped protrusion and the acute-angle protrusion squeeze the passive protrusion, so that the inner bracket one and the inner bracket two move towards the inner wall of the pipe, and push the inside of the pipe outward.

[0022] S2. The passive protrusion is designed to be 1 / 4 thickness, which facilitates the synchronous extension and retraction of multiple inner brackets one or two. The center point of the linkage shaft is defined as line A. Inner brackets one and two are symmetrically distributed about line A. At the same time, the position of line A is lower than that of inner brackets one and two. This can ensure that the linkage shaft is not overly affected during cutting.

[0023] S3. Control the gear to rotate. The gear grooves can make the linkage shaft rotate. Under the action of inner bracket one and inner bracket two, the pipe can rotate, thereby cutting the pipe completely.

[0024] S4. After the cutting is completed, the servo motor is reversed 90°. At this time, the acute-angle protrusion and the corresponding passive protrusion are misaligned. Under the action of the spring, the inner bracket 1 retracts. At this time, the longer section of pipe is no longer affected by the inner bracket 1. After the linkage roller rotates 90°, point B of the fan-shaped protrusion no longer supports the passive protrusion. Point C of the fan-shaped protrusion supports the passive protrusion. The inner bracket 2 still supports the section of pipe after cutting. At this time, the hydraulic cylinder can drive this section of pipe.

[0025] S5. When the bearing seat of the variable seat is reached, the servo motor is controlled to reverse 90°. At this time, the pipe falls on the variable seat. As the hydraulic cylinder continues to move, the linkage shaft disengages from this section of the pipe. The control screw causes the transmission seat to drive the variable seat to perform telescopic movement, so that the variable seat reaches the extension seat position.

[0026] The beneficial effects of this invention are:

[0027] 1. By using an auxiliary limiting mechanism to provide outward support from inside the pipe, the cutting position is prevented from being stressed and sinking or shifting during the cutting process, ensuring the integrity of the cut and the overall precision of the pipe cutting;

[0028] 2. Through the meshing transmission of the linkage shaft, tooth groove and gear, and the function of the inner bracket, the pipe can be driven to rotate stably, realizing full circumferential cutting of the pipe, improving cutting efficiency and uniformity.

[0029] 3. The protective frame shields the chips generated at the cutting point, protecting the operator's safety; the symmetrical distribution and low position of the inner bracket about the center line A of the linkage shaft further reduces the impact on the linkage shaft during cutting and improves overall safety.

[0030] 4. In this solution, the discharge rack is combined with the extension seat and the variable seat, and driven by the lead screw and guide rod to realize the directional discharge and unified management of the cut pipe; the step-by-step reverse control (i.e., first release the long section of pipe at 90°, and then release the short section of pipe at 90°) is combined with the hydraulic cylinder to push the cut pipe to the bearing seat, realize automated temporary bearing and detachment, and improve the convenience of operation.

[0031] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0033] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0034] Figure 2 This is a schematic diagram from another perspective of the present invention.

[0035] Figure 3 This invention is based on Figure 1 Plan view.

[0036] Figure 4 This invention is based on Figure 1 A partial schematic diagram of the end.

[0037] Figure 5 This is a schematic diagram of the linkage shaft structure of the present invention.

[0038] Figure 6 This is a schematic diagram of the variable seat structure of the present invention.

[0039] Figure 7 This invention is based on Figure 5 Cross-sectional diagram.

[0040] Figure 8 This is a schematic diagram showing the single acute-angle protrusion, the fan-shaped protrusion, and the passive protrusion of the present invention.

[0041] Figure 9 This is a schematic diagram of the inner bracket and passive protrusion structure of the present invention.

[0042] Figure 10 This is a schematic diagram of the linkage roller of the present invention.

[0043] Reference numerals: 100, base frame; 101, rolling frame; 200, support and protective frame; 201, cutting tool holder; 300, discharge frame; 300a, discharge port; 301, extension seat; 302, variable seat; 303, lead screw; 304, guide rod; 305, transmission seat; 306, bearing seat; 400, bearing plate; 401, hydraulic cylinder; 402, baffle plate; 403, linkage shaft; 404, inner bracket one; 404a, inner bracket two; 405, guide channel; 406, tooth groove; 407, gear; 408, limiting plate; 409, spring; 500, linkage roller; 501, servo motor; 502, acute angle protrusion; 503, fan-shaped protrusion; 504, passive protrusion. Detailed Implementation

[0044] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0045] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0046] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0047] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0048] Example, refer to Figures 1 to 4 A pipe cutting device and its cutting method, comprising a base frame 100, a support and protective frame 200, and a discharge frame 300;

[0049] The support and protective frame 200 and the discharge frame 300 are arranged at the outer periphery of the end of the base frame 100. The support and protective frame 200 supports the cutting tool 201 and shields the waste generated at the cutting point, thus providing a protective effect. The support and protective frame 200 and the discharge frame 300 are arranged adjacent to each other. The rolling frame 101 is symmetrically installed on the base frame 100, and the rolling frame 101 provides an auxiliary effect for the rotation of the pipe.

[0050] The top inner edge of the support and protective frame 200 has a cutting tool 201 that can extend and retract, and the cutting tool 201 is used to cut the pipe.

[0051] A discharge port 300a is provided on one side of the discharge rack 300, and an extension seat 301 is installed on one side of the discharge rack 300. The extension seat 301 facilitates the directional discharge of the cut part of the pipe, which is convenient for unified management. A variable seat 302 is slidably connected to both the discharge rack 300 and the extension seat 301.

[0052] refer to Figure 6 The discharge rack 300 and the extension seat 301 are both equipped with a lead screw 303 and a guide rod 304. The lead screw 303 is rotatably mounted on the discharge rack 300 and the extension seat 301, while the guide rod 304 is fixedly mounted on the discharge rack 300 and the extension seat 301. The lead screw 303 is used to change the position of the variable seat 302, and the guide rod 304 is guided by a screw drive. A pair of transmission seats 305 are installed on the back of the variable seat 302. The pair of transmission seats 305 are threadedly connected to the lead screw 303 and slidably connected to the guide rod 304, respectively, so that the lead screw 303 can drive the variable seat 302 to perform telescopic movement when rotating. A bearing seat 306 is installed on the upper surface of the variable seat 302, and the bearing seat 306 is used to temporarily support the cut pipe.

[0053] refer to Figure 4 , Figure 5 and Figure 7 A bearing plate 400 is installed above the end of the base frame 100. A hydraulic cylinder 401 is mounted on the bearing plate 400. A baffle plate 402 is installed at the output end of the hydraulic cylinder 401. A linkage shaft 403 is rotatably mounted on the inner edge of the baffle plate 402. The linkage shaft 403 is smaller than the pipe specification to facilitate smooth entry into the pipe. An auxiliary limiting mechanism and an adjustment mechanism are installed on the linkage shaft 403. The auxiliary limiting mechanism is used to ensure the stability of the pipe during cutting, and the adjustment mechanism is used to change the state of the auxiliary limiting mechanism.

[0054] refer to Figure 5 and Figure 7The auxiliary limiting mechanism includes an inner bracket 1 404, an inner bracket 2 404a, a guide channel 405, a toothed groove 406, and a gear 407. A guide channel 405 is formed on the surface of the linkage shaft 403. The inner bracket 1 404 and inner bracket 2 404a extend and retract within the guide channel 405. Multiple inner brackets 1 404 and 2 404a are arranged in a circumferential array. The number of guide channels 405 is the same as the total number of inner brackets 1 404 and 2 404a. The inner brackets 1 404 and 2 404a are used to abut against the inner edge of the pipe, which helps to prevent the cutting position from being crushed during cutting and facilitates the rotation of the pipe to ensure comprehensive and precise cutting. A toothed groove 406 is milled on the circumferential surface of one end of the shaft 403 outside the baffle 402. A gear 407 is installed at the contour position of the baffle 402. The gear 407 and the toothed groove 406 mesh and drive each other. When the gear 407 is controlled to rotate by another motor, it can drive the linkage shaft 403 to rotate through the toothed groove 406, thereby driving the pipe to rotate and facilitating its full cutting. A limiting plate 408 is fixedly installed on both sides of the inner bracket 1 404 and inner bracket 2 404a that extend into the linkage shaft 403. A spring 409 is placed between the limiting plate 408 and the inner edge of the linkage shaft 403. The spring 409 can drive the inner bracket 1 404 or inner bracket 2 404a to return to its original position when no force is applied.

[0055] refer to Figures 7 to 10 The adjustment mechanism includes a linkage roller 500, an acute-angle protrusion 502, a fan-shaped protrusion 503, and a passive protrusion 504. The linkage roller 500 is hinged at the center of the linkage shaft 403. One end of the linkage roller 500 extending out of the linkage shaft 403 is connected to a servo motor 501, which controls the rotation of the linkage roller 500. The servo motor 501 is mounted on the linkage shaft 403 via a bracket. Multiple fan-shaped protrusions 503 are installed on the surface of the end of the linkage roller 500 near the servo motor 501, and the multiple fan-shaped protrusions 503 are arranged from left to right. The multiple acute-angle protrusions 502 are arranged in a 90° rotational distribution. The surface of the linkage roller 500 away from the servo motor 501 is provided with multiple acute-angle protrusions 502, which are arranged in a 90° rotational distribution from left to right. The inner bracket 1 404 and inner bracket 2 404a are both equipped with passive protrusions 504 at the ends of the inner bracket 1 404 or inner bracket 2 404a that extend into the linkage shaft 403. The thickness of the passive protrusions 504 is 1 / 4 of the thickness of the inner bracket 1 404 or inner bracket 2 404a. The passive protrusions 504 on the multiple inner bracket 1 404 or inner bracket 2 404a are arranged in a clockwise staggered distribution.

[0056] This implementation allows for the following: the pipe to be cut is placed on the base frame 100, the pipe is adjusted to the cutting area, and the hydraulic cylinder 401 is controlled to move the baffle 402 toward the pipe. At this time, the inner bracket 404 is in a retracted state, and the linkage shaft 403 can smoothly enter the pipe. When the appropriate position is reached, the servo motor 501 is controlled to rotate the linkage roller 500 180°. The linkage roller 500 drives the acute-angle protrusion 502 and the fan-shaped protrusion 503 to rotate. 02. The passive protrusion 504 is compressed, causing the inner bracket 1 404 and inner bracket 2 404a to move towards the inner wall of the pipe, providing an outward support effect for the pipe. When the cutting tool 201 cuts the pipe, it ensures the integrity of the cutting edge and prevents the pipe from shifting during cutting. By designing the passive protrusion 504 to be 1 / 4 thickness, multiple inner brackets 1 404 or inner bracket 2 404a can move synchronously, ensuring a better outward support effect on the inner wall of the pipe. This solution... Figure 5 In this process, the center point of the linkage shaft 403 is defined as line A. Inner bracket 1 404 and inner bracket 2 404a are symmetrically distributed about line A, ensuring a more stable pipe cutting effect. Simultaneously, the position of line A is lower than that of inner bracket 1 404 and inner bracket 2 404a, thus preventing excessive impact on the linkage shaft 403 during cutting and improving cutting safety. After cutting at one point, the control gear 407 rotates, and the linkage shaft 403 rotates through the tooth groove 406. Under the action of inner bracket 1 404 and inner bracket 2 404a, the pipe rotates, allowing for comprehensive pipe cutting. The support and protective frame 200 shields the debris during cutting, ensuring operator safety. After cutting, the control servo motor 501 first reverses 90°, at which point the acute-angle protrusion 502 and the corresponding passive protrusion 504 are misaligned. Under the action of spring 409, the inner bracket 404 retracts. At this moment, the longer section of pipe is no longer supported by the inner bracket 404. After the linkage roller 500 rotates 90°, point B of the fan-shaped protrusion 503 no longer supports the passive protrusion 504. Instead, point C of the fan-shaped protrusion 503 supports the passive protrusion 504. The inner bracket 404a still supports the cut section of pipe. At this moment, the driving hydraulic cylinder 401 can drive this section of pipe. When it reaches the position of the bearing seat 306 of the variable seat 302, the servo motor 501 is controlled to reverse 90°. At this time, the pipe falls on the variable seat 302. As the hydraulic cylinder 401 continues to move, the linkage shaft 403 disengages from this section of pipe. By controlling the lead screw 303, the transmission seat 305 drives the variable seat 302 to perform telescopic movement, so that the variable seat 302 reaches the position of the extension seat 301, which facilitates subsequent unified management.

[0057] It should be understood that numerous specific implementation decisions can be made during the development of any actual implementation method, and in any engineering or design project. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0058] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A pipe cutting device, characterized in that: Includes base frame, support and protective frame, and discharge rack; The support and protective frame and the discharge frame are located at the outer periphery of the end of the base frame. The support and protective frame and the discharge frame are arranged adjacent to each other. Rolling frames are symmetrically installed on the base frame. The top inner edge of the support and protective frame has a cutting tool that can extend and retract, and the cutting tool is used to cut the pipe. The discharge rack has a discharge port on one side and an extension seat on one side. A movable seat is slidably connected to both the discharge rack and the extension seat. A bearing plate is installed at the upper end of the base frame. A hydraulic cylinder is mounted on the bearing plate. A stop plate is installed at the output end of the hydraulic cylinder. A linkage shaft is rotatably mounted on the inner edge of the stop plate. An auxiliary limiting mechanism and an adjustment mechanism are installed on the linkage shaft. The auxiliary limiting mechanism includes an inner bracket one, an inner bracket two, a guide channel, a tooth groove, and a gear. The surface of the linkage shaft is provided with a guide channel. The inner bracket one and the inner bracket two move telescopically in the guide channel. There are multiple inner brackets one and two in a circumferential array. The number of guide channels is the same as the total number of inner brackets one and two. Both inner bracket one and inner bracket two are fixedly installed with limiting plates at one end of the linkage shaft, and a spring is placed between the limiting plate and the inner edge of the linkage shaft. The adjustment mechanism includes a linkage roller, an acute-angle protrusion, a fan-shaped protrusion, and a passive protrusion. The linkage roller is hinged at the center of the linkage shaft. One end of the linkage roller extending out of the linkage shaft is connected to a servo motor. The servo motor is mounted on the linkage shaft via a bracket. The surface of the linkage roller near the servo motor is provided with multiple fan-shaped protrusions, which are arranged in a 90° rotational arrangement from left to right. The surface of the linkage roller away from the servo motor is provided with multiple acute-angle protrusions, which are arranged in a 90° rotational arrangement from left to right. Both inner bracket one and inner bracket two have a passive protrusion installed at one end that extends into the linkage shaft. The thickness of the passive protrusion is 1 / 4 of the thickness of inner bracket one or inner bracket two. Multiple passive protrusions on inner bracket one or inner bracket two are staggered in a clockwise direction.

2. The pipe cutting equipment according to claim 1, characterized in that: The discharge rack and the extension seat are both equipped with a lead screw and a guide rod. The lead screw is rotatably mounted on the discharge rack and the extension seat, and the guide rod is fixedly mounted on the discharge rack and the extension seat.

3. The pipe cutting equipment according to claim 2, characterized in that: A pair of transmission seats are installed on the back of the variable seat. The pair of transmission seats are respectively threaded to the lead screw and slidably connected to the guide rod. A bearing seat is installed on the upper surface of the variable seat.

4. The pipe cutting equipment according to claim 1, characterized in that: The linkage shaft has a toothed groove milled on one end of the circumference outside the baffle plate. The gear is installed at the contour position of the baffle plate, and the gear and the toothed groove mesh for transmission.

5. A pipe cutting method, characterized in that: The pipe cutting device according to any one of claims 1-4 further includes the following steps: S1. Adjust the pipe to the cutting zone position, control the hydraulic cylinder to move the baffle towards the pipe position, and the linkage shaft smoothly enters the pipe. When it reaches the appropriate position, control the servo motor to make the linkage roller rotate 180°. The linkage roller drives the acute-angle protrusion and the fan-shaped protrusion to rotate. The fan-shaped protrusion and the acute-angle protrusion squeeze the passive protrusion, so that the inner bracket one and the inner bracket two move towards the inner wall of the pipe, and push the inside of the pipe outward. S2. The passive protrusion is designed to be 1 / 4 thickness, which facilitates the synchronous extension and retraction of multiple inner brackets one or two. The center point of the linkage shaft is defined as line A. Inner brackets one and two are symmetrically distributed about line A. At the same time, the position of line A is lower than that of inner brackets one and two. This can ensure that the linkage shaft is not overly affected during cutting. S3. Control the gear to rotate. The gear grooves can make the linkage shaft rotate. Under the action of inner bracket one and inner bracket two, the pipe can rotate, thereby cutting the pipe completely. S4. After the cutting is completed, the servo motor is controlled to reverse 90°. At this time, the acute-angle protrusion and the corresponding passive protrusion are misaligned. Under the action of the spring, the inner bracket 1 retracts. At this time, the longer section of the pipe is no longer under the action of the inner bracket 1. After the linkage roller rotates 90°, the B point of the fan-shaped protrusion no longer bears the passive protrusion. The C point of the fan-shaped protrusion bears the passive protrusion. The inner bracket 2 still supports the section of pipe after cutting. At this time, the hydraulic cylinder can drive this section of pipe. S5. When the bearing seat of the variable seat is reached, the servo motor is controlled to reverse 90°. At this time, the pipe falls on the variable seat. As the hydraulic cylinder continues to move, the linkage shaft disengages from this section of the pipe. The control screw causes the transmission seat to drive the variable seat to perform telescopic movement, so that the variable seat reaches the extension seat position.

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