A high-precision angle trimmer for pipe fittings

Abstract

This invention discloses a high-precision angle trimming tool for pipe fittings, belonging to the technical field of pipe installation auxiliary devices. The technical solution is as follows: a high-precision angle trimming tool for pipe fittings includes a clamping assembly for holding the pipe fitting, a trimming assembly for cutting the surface of the pipe fitting to be trimmed, a control unit for controlling the trimming assembly's proximity to or distance from the surface of the pipe fitting to be trimmed, and for adjusting the angle of the trimming surface of the trimming assembly, a controller for controlling the clamping assembly, the trimming assembly, and the control unit, and a base for mounting the clamping assembly and the trimming assembly. The beneficial effects of this invention are: the high-precision angle trimming tool for pipe fittings provided by this invention has a simple structure, is easy to operate, and can meet the fine-trimming operations of different types of pipe fittings; the high-precision angle trimming method for pipe fittings provided by this invention has a simple procedure, is easy to operate, and has a wide range of applications.

Description

Technical Field

[0001] This invention relates to the field of pipeline installation auxiliary devices, and in particular to a high-precision angle trimmer for pipeline fittings. Background Technology

[0002] Pipe fittings are common accessories in pipelines, playing roles in connecting, controlling, changing direction, diverting flow, sealing, and supporting pipeline systems. Examples include 90° elbows, 45° elbows, and tees. The following problems mainly exist in the current installation process of pipe fittings: 1. Low pipeline assembly accuracy: Currently, large pipe fittings such as carbon steel or stainless steel 90° elbows, 45° elbows, and tees are mainly manufactured using pressing or push-forming processes. The dimensional and angular accuracy of these fittings is insufficient, thus affecting the pipeline assembly accuracy. 2. Large angular errors in fittings: To adjust the pipeline installation accuracy, uneven weld seams occur during the assembly of fittings and pipes. After the weld seams cool, thermal expansion and contraction cause uneven shrinkage of the weld metal, thus affecting the pipeline assembly accuracy. 3. Slow construction progress: During pipeline construction and installation, large angular errors in fittings require manual cutting and adjustment. Insufficient adjustment accuracy and low efficiency indirectly affect the construction progress.

[0003] How to solve the above-mentioned technical problems is the challenge facing this invention. Summary of the Invention

[0004] In order to solve the problems in the prior art, the present invention provides a high-precision angle trimmer for pipe fittings that is simple in structure, easy to operate, and can meet the fine repair operations of different types of pipe fittings. At the same time, it provides a high-precision angle trimmer for pipe fittings that is simple in process, easy to operate, and has a wide range of applications.

[0005] To achieve the above-mentioned objectives, the present invention provides a high-precision angle trimmer for pipe fittings, comprising:

[0006] Clamping assembly for clamping pipe fittings;

[0007] A finishing assembly used to cut the surfaces of pipe fittings that require finishing.

[0008] The control unit is used to control the trimming assembly to move closer to or further away from the surface of the pipe to be trimmed, and to adjust the angle of the trimming surface of the trimming assembly.

[0009] A controller for controlling the clamping assembly, the trimming assembly, and the control unit;

[0010] And a base for mounting the clamping assembly and the trimming assembly.

[0011] During operation, the pipe fitting is clamped by the clamping component. After controlling the angle of the trimming surface of the trimming component, the trimming component is brought close to the surface of the pipe fitting to be trimmed. When a whole circle of milling chips appears on the surface of the pipe fitting to be trimmed, the trimming operation is completed. The structure is simple, the operation is convenient, the trimming efficiency is high or the trimming effect is good, ensuring the assembly accuracy of the pipe fitting in the later use, avoiding uneven deformation after assembly, saving subsequent processing steps, and thus improving the construction progress during use.

[0012] Another specific feature of the present invention is that the control unit includes a distance adjustment component for controlling the trimming component to move closer to or further away from the surface to be trimmed on the pipe fitting, and an angle adjustment component for adjusting the trimming component. The angle of the trimming surface and the operation of the trimming component moving closer to or further away from the pipe fitting can be performed step by step or in combination, thereby improving work efficiency.

[0013] The invention also features that the clamping surface of the clamping assembly is horizontal, the distance adjustment assembly includes a vertically arranged mounting plate and a telescopic cylinder that controls the mounting plate to move back and forth in the horizontal direction, and the angle adjustment assembly is connected to the mounting plate. During operation, only the telescopic cylinder needs to be controlled to adjust the trimming assembly to move closer to or further away from the pipe, which is convenient to operate.

[0014] Another specific feature of the present invention is that the trimming assembly includes a mechanism box, a rotating plate disposed on one side of the mechanism box, and a plurality of milling cutters disposed on the rotating plate. The structure is simple and the trimming operation can be performed when the rotating plate rotates.

[0015] The invention also features that the mounting plate has a plurality of parallel slide rails on its side near the clamping assembly; the angle adjustment assembly includes a first sliding block that cooperates with the slide rails, a sliding drive component that controls the movement of the first sliding block along the slide rails, a motor mounted on the first sliding block, and a gear set driven by the motor; one end of the mechanism box is rotatably connected to the first sliding block, and the mechanism box cooperates with the gear set; the gear set includes two meshing gears, one of which has its shaft coaxial with the output shaft of the motor, and the other gear is fixedly connected to the mechanism box, and its shaft is coaxial with the rotational connection between the mechanism box and the first sliding block.

[0016] Further features of this invention include: a second sliding groove is provided on each side of the mounting plate of the mechanism box; the second sliding groove is parallel to the slide rail; the angle adjustment assembly also includes two auxiliary support components corresponding to the two second sliding grooves; the auxiliary support components include a second sliding block that slides with the second sliding groove, and a first connecting rod and a second connecting rod whose ends are rotatably connected to each other via a rotating shaft; the other end of the first connecting rod is connected to the second sliding block, and the other end of the second connecting rod is connected to the other end of the mechanism box; preferably, the first connecting rod and the second sliding block are fixedly connected, and the second connecting rod and the mechanism box are fixedly connected via a sleeve ring; the rotating shaft is coaxial with the rotating connection part between the mechanism box and the first sliding block.

[0017] The present invention also features that the base includes a worktable and a back plate fixed to one end of the worktable. The top surface of the worktable away from the back plate is provided with a clamping surface. In use, the pipe is placed on the clamping surface and clamped by the clamping assembly. Preferably, the clamping assembly is configured as a centering and locking structure. Specifically, a plurality of through slots are opened on the clamping surface. The plurality of through slots are evenly arranged circumferentially and connected to each other at one end. The clamping claws of the clamping assembly correspond one-to-one with the plurality of through slots. The control component of the clamping assembly controls the plurality of clamping claws to move closer or further away synchronously to achieve clamping of pipes of different sizes and to ensure that the clamping part of the pipe is perpendicular to the clamping surface. Controlling the plurality of clamping claws to move closer or further away synchronously is prior art and will not be described in detail here. Preferably, the worktable is provided with a straightening component (not shown in the figure), so that when the pipe is clamped or in the clamping state, the plane where the center line of the pipe is located is perpendicular to the plane where the plurality of milling cutters are located.

[0018] The straightening assembly includes two straightening plates that are parallel and symmetrically located on both sides of the clamping assembly, and a straightening drive component that controls the two straightening plates to move closer or further away synchronously. The two straightening plates are perpendicular to the planes where several milling cutters are located, and the two straightening plates are symmetrical about the planes where several through slots intersect. The bottom surface of the straightening plate is slightly higher than the top surface of the clamping claw. When the pipe is clamped but not tightened, the two straightening plates are controlled to move closer to each other until the opposite sides of the two straightening plates are in contact with the pipe, and the clamping assembly is tightened to straighten the pipe. After straightening, the two straightening plates are reset. The reset two straightening plates are located outside the trimming assembly to avoid interference during the trimming process.

[0019] The structure that allows the two straightening plates to move closer or further apart synchronously, i.e., the straightening drive component, is existing technology. For example, a guide rod is set to slide with the two straightening plates. The sliding direction of the straightening plates is the direction in which the two straightening plates move closer or further apart. A double-threaded rod is set along the direction parallel to the guide rod, and the thread directions at both ends of the double-threaded rod are opposite. The two straightening plates are respectively threaded with the two ends of the double-threaded rod. When the double-threaded rod rotates, the two straightening plates will move closer or further apart synchronously along the guide rod. This will not be elaborated further here.

[0020] Another specific feature of the present invention is that the base also includes a plurality of foot pads disposed on the bottom surface of the workbench. Preferably, the foot pads are adjustable foot pads, which can be adjusted to make the clamping surface level.

[0021] The telescopic cylinder is driven by an air compressor, and the telescopic cylinder is connected to the output end of the air compressor through a connecting pipe. Preferably, the air compressor is placed on the workbench.

[0022] Another specific feature of the present invention is that a first sliding groove is provided on each of the opposite sides of the clamping surface on the worktable, and the bottom end of the mounting plate cooperates with the first sliding groove to ensure the stability of the mounting plate during movement.

[0023] A method for adjusting the angle of a pipe fitting using a high-precision angle adjuster includes the following steps:

[0024] Step S1: Clamp one end of the pipe fitting with the clamping assembly, while ensuring that the plane containing the center line of the pipe fitting is perpendicular to the working surface of the trimming assembly.

[0025] Step S2: Control the angle between the working surface of the trimming component and the surface of the pipe to be trimmed by the control unit, control the trimming component to approach the surface of the pipe to be trimmed, and start the trimming component until milling chips appear around the surface of the pipe to be trimmed. Preferably, the control unit and trimming component automatically reset as a whole.

[0026] In step S1, the plane containing the center line of the pipe fitting is made perpendicular to the working surface of the trimming component by using the straightening component. The method includes the following steps:

[0027] Step S101: Control the clamping assembly to pre-clamp the pipe fitting;

[0028] Step S102: Control the straightening assembly to straighten the pre-clamped pipe fitting;

[0029] Step S103: Control the clamping assembly to clamp the pipe fitting;

[0030] Step S104: Control the repositioning component to reset.

[0031] Step S2, the method for controlling the angle between the working surface of the trimming component and the surface of the pipe fitting to be finely trimmed, includes the following steps:

[0032] Step S201: Control the first sliding block to slide along the slide rail as needed;

[0033] Step S202: The motor drives the gear set to rotate, which in turn causes the mechanism box to rotate. During this process, the second connecting rod rotates along the rotation axis to ensure the stability of the rotation.

[0034] Specifically, when trimming 90° elbow fittings or straight tee fittings, the trimming working surface is at a 90° angle to the clamping surface;

[0035] When trimming a 45° elbow pipe fitting, the trimming working surface is facing downwards and at a 45° angle to the clamping surface. During operation, after the angle adjustment component is adjusted, the trimming surface moves closer to or further away from the pipe fitting surface to be trimmed by moving the mounting plate and the first sliding block.

[0036] When the pipe fitting is being adjusted for parallelism, the adjustment working surface is facing downwards and parallel to the clamping surface. During operation, after the angle adjustment component has been adjusted, the adjustment surface moves closer to or further away from the pipe fitting surface to be finely adjusted by moving the first sliding block.

[0037] The beneficial effects of this invention are as follows: The high-precision pipe fitting angle trimmer provided by this invention, through the cooperation of the clamping component, trimming component and control unit, can efficiently complete the fine trimming operation of pipe fittings in a simple process, ensuring the assembly accuracy of the pipe fittings during later use, avoiding uneven deformation after assembly, saving subsequent processing steps, and thus improving the construction progress during use; This invention has a simple structure, is easy to operate, can meet the fine trimming operation of different types of pipe fittings, and has a wide range of applications; The trimming method provided by this invention is easy to operate, applicable to different types of pipe fittings, and suitable for widespread application. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of the present invention;

[0039] Figure 2 This is the left view of the present invention.

[0040] The attached figures are labeled as follows: 1. Base; 11. Worktable; 111. Clamping surface; 112. First slide groove; 12. Back plate; 13. Foot pad; 2. Controller; 3. Distance adjustment assembly; 31. Mounting plate; 311. Second slide groove; 312. Slide rail; 32. Telescopic cylinder; 33. Air compressor; 34. Connecting pipe; 41. First sliding block; 42. Motor; 43. Gear set; 44. Second sliding block; 45. First connecting rod; 46. Rotating shaft; 47. Second connecting rod; 48. Sleeve ring; 51. Mechanism box; 52. Turning plate; 53. Milling cutter;

[0041] 6. Clamping components. Detailed Implementation

[0042] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0043] See Figures 1 to 2 This invention provides a high-precision angle trimmer for pipe fittings, comprising:

[0044] Clamping assembly 6 is used to clamp the pipe fitting;

[0045] A finishing assembly used to cut the surfaces of pipe fittings that require finishing.

[0046] The control unit is used to control the trimming assembly to move closer to or further away from the surface of the pipe to be trimmed, and to adjust the angle of the trimming surface of the trimming assembly.

[0047] Controller 2 is used to control clamping assembly 6, trimming assembly, and control unit;

[0048] And base 1, for mounting clamping assembly 6 and trimming assembly.

[0049] During operation, the pipe fitting is clamped by the clamping component 6. After controlling the angle of the trimming surface of the trimming component, the trimming component is brought close to the surface of the pipe fitting to be trimmed. When a whole circle of milling chips appears on the surface of the pipe fitting to be trimmed, the trimming operation is completed. The structure is simple, the operation is convenient, the trimming efficiency is high or the trimming effect is good, ensuring the assembly accuracy of the pipe fitting in the later use, avoiding uneven deformation after assembly, saving subsequent processing steps, and thus improving the construction progress during use.

[0050] Another specific feature of the present invention is that the control unit includes a distance adjustment component 3 for controlling the trimming component to move closer to or further away from the surface to be trimmed on the pipe, and an angle adjustment component for adjusting the trimming component. The angle of the trimming surface and the operation of the trimming component moving closer to or further away from the pipe can be carried out step by step or in combination, thereby improving work efficiency.

[0051] The present invention also features that the clamping surface of the clamping component 6 is horizontal, the distance adjustment component 3 includes a vertically arranged mounting plate 31 and a telescopic cylinder 32 that controls the mounting plate 31 to move back and forth in the horizontal direction, and the angle adjustment component is connected to the mounting plate 31. During operation, only the telescopic cylinder 32 needs to be controlled to move the adjustment component closer to or further away from the pipe, which is convenient to operate.

[0052] Another specific feature of the present invention is that the trimming assembly includes a mechanism box 51, a rotating plate 52 disposed on one side of the mechanism box 51, and a plurality of milling cutters 53 disposed on the rotating plate 52. The structure is simple and the trimming operation can be performed when the rotating plate 52 rotates.

[0053] The present invention also features that the mounting plate 31 has a plurality of parallel slide rails 312 on the side near the clamping assembly 6, the angle adjustment assembly includes a first sliding block 41 that cooperates with the slide rail 312, a sliding drive component that controls the movement of the first sliding block 41 along the slide rail 312, a motor 42 mounted on the first sliding block 41, and a gear set 43 driven to rotate by the motor 42; one end of the mechanism box 51 is rotatably connected to the first sliding block 41, and the mechanism box 51 cooperates with the gear set 43. The gear set 43 includes two meshing gears, one of which has a shaft coaxial with the output shaft of the motor 42, and the other gear is fixedly connected to the mechanism box 51, and the shaft of the other gear is coaxial with the rotational connection between the mechanism box 51 and the first sliding block 41.

[0054] In addition, the mounting plate 31 has a second slide groove 311 on each side of the mechanism box 51. The second slide groove 311 is parallel to the slide rail 312. The angle adjustment component also includes two auxiliary support components that correspond one-to-one with the two second slide grooves 311. The auxiliary support components include a second sliding block 44 that slides with the second slide groove 311, and a first connecting rod 45 and a second connecting rod 47 that are rotatably connected to each other at one end by a rotating shaft 46. The other end of the first connecting rod 45 is connected to the second sliding block 44, and the other end of the second connecting rod 47 is connected to the other end of the mechanism box 51. Preferably, the first connecting rod 45 and the second sliding block 44 are fixedly connected, and the second connecting rod 47 and the mechanism box 51 are fixedly connected by a sleeve ring 48. The rotating shaft is coaxial with the rotating connection part between the mechanism box 51 and the first sliding block 41.

[0055] The present invention also features that the base 1 includes a worktable 11 and a back plate 12 fixed to one end of the worktable 11. The end of the top surface of the worktable 11 away from the back plate 12 is provided with a clamping surface 111. In use, the pipe is placed on the clamping surface 111 and clamped by the clamping assembly 6. Preferably, the clamping assembly 6 is configured as a centering and locking structure. Specifically, a plurality of through slots are opened on the clamping surface 111. The plurality of through slots are evenly arranged circumferentially and connected to each other at one end. The clamping claws of the clamping assembly 6 correspond one-to-one with the plurality of through slots. The control component of the clamping assembly 6 controls the plurality of clamping claws to move closer or further away synchronously, so as to realize the clamping of pipes of different sizes and ensure that the clamping part of the pipe is perpendicular to the clamping surface 111. Controlling the plurality of clamping claws to move closer or further away synchronously is the prior art and will not be described in detail here. Preferably, the worktable 11 is provided with a straightening component (not shown in the figure), so that when the pipe is clamped or in the clamping state, the plane where the center line of the pipe is located is perpendicular to the plane where the plurality of milling cutters 53 are located.

[0056] The straightening assembly includes two straightening plates that are parallel and symmetrically located on both sides of the clamping assembly 6, and a straightening drive component that controls the two straightening plates to move closer or further away synchronously. The two straightening plates are perpendicular to the plane containing several milling cutters 53, and the two straightening plates are symmetrical about the plane containing several through slots. The bottom surface of the straightening plate is slightly higher than the top surface of the clamping claw. When the pipe is clamped but not tightened, the two straightening plates are controlled to move closer to each other until the opposite sides of the two straightening plates are in contact with the pipe. Then the clamping assembly 6 is tightened to straighten the pipe. After straightening, the two straightening plates are reset. The reset two straightening plates are located outside the trimming assembly to avoid interference during the trimming process.

[0057] The structure that allows the two straightening plates to move closer or further apart synchronously, i.e., the straightening drive component, is existing technology. For example, a guide rod is set to slide with the two straightening plates. The sliding direction of the straightening plates is the direction in which the two straightening plates move closer or further apart. A double-threaded rod is set along the direction parallel to the guide rod, and the thread directions at both ends of the double-threaded rod are opposite. The two straightening plates are respectively threaded with the two ends of the double-threaded rod. When the double-threaded rod rotates, the two straightening plates will move closer or further apart synchronously along the guide rod. This will not be elaborated further here.

[0058] Another specific feature of the present invention is that the base 1 also includes a plurality of foot pads 13 disposed on the bottom surface of the workbench 11. Preferably, the foot pads 13 are adjustable foot pads, which can be adjusted to make the clamping surface 111 horizontal.

[0059] The telescopic cylinder 32 is driven by the air compressor 33. The telescopic cylinder 32 and the output end of the air compressor 33 are connected through the connecting pipe 34. Preferably, the air compressor 33 is placed on the workbench 11.

[0060] Another specific feature of the present invention is that a first sliding groove 112 is provided on each of the opposite sides of the clamping surface 111 on the workbench 11, and the bottom end of the mounting plate 31 cooperates with the first sliding groove 112 to ensure the stability of the mounting plate 31 during the movement process.

[0061] A method for adjusting the angle of pipe fittings using a high-precision angle adjuster includes the following steps:

[0062] Step S1: Clamp one end of the pipe fitting with clamping component 6, while ensuring that the plane containing the center line of the pipe fitting is perpendicular to the working surface of the trimming component.

[0063] Step S2: Control the angle between the working surface of the trimming component and the surface of the pipe to be trimmed by the control unit, control the trimming component to approach the surface of the pipe to be trimmed, and start the trimming component until milling chips appear around the surface of the pipe to be trimmed. Preferably, the control unit and trimming component automatically reset as a whole.

[0064] In step S1, the plane containing the center line of the pipe fitting is made perpendicular to the working surface of the trimming component by using the straightening component. The method includes the following steps:

[0065] Step S101: Control the clamping assembly 6 to pre-clamp the pipe fitting;

[0066] Step S102: Control the straightening assembly to straighten the pre-clamped pipe fitting;

[0067] Step S103: Control the clamping assembly 6 to clamp the pipe fitting;

[0068] Step S104: Control the repositioning component to reset.

[0069] Step S2, the method for controlling the angle between the working surface of the trimming component and the surface of the pipe fitting to be finely trimmed, includes the following steps:

[0070] Step S201: Control the first sliding block 41 to slide along the slide rail 312 as needed;

[0071] Step S202: The motor 42 drives the gear set 43 to rotate, which in turn causes the mechanism box 51 to rotate. During this process, the second connecting rod 47 rotates along the rotation axis 46 to ensure the stability of the rotation.

[0072] Specifically, when trimming 90° elbow fittings or straight tee fittings, the trimming working surface is at a 90° angle to the clamping surface 111;

[0073] When trimming a 45° elbow pipe fitting, the trimming working surface faces downward and is at a 45° angle to the clamping surface 111. During operation, after the angle adjustment component has been adjusted, the trimming surface moves closer to or further away from the pipe fitting surface to be trimmed by moving the mounting plate and the first sliding block.

[0074] When the pipe fitting is being adjusted for parallelism, the adjustment working surface is facing downwards and parallel to the clamping surface 111. During operation, after the angle adjustment component has been adjusted, the adjustment surface moves closer to or further away from the pipe fitting surface to be finely adjusted by moving the first sliding block.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-precision angle trimmer for pipe fittings, characterized in that, include: Clamping assembly (6) for clamping pipe fittings; A finishing assembly used to cut the surfaces of pipe fittings that require finishing. The control unit is used to control the trimming assembly to move closer to or further away from the surface of the pipe to be trimmed, and to adjust the angle of the trimming surface of the trimming assembly. Controller (2) is used to control the clamping assembly (6), the trimming assembly, and the control unit; and a base (1) for mounting the clamping assembly (6) and the trimming assembly; The control unit includes a distance adjustment component (3) for controlling the trimming component to move closer to or further away from the surface of the pipe to be trimmed, and an angle adjustment component for adjusting the trimming component. The clamping surface of the clamping assembly (6) is horizontal. The distance adjustment assembly (3) includes a vertically arranged mounting plate (31) and a telescopic cylinder (32) that controls the mounting plate (31) to move back and forth in the horizontal direction. The angle adjustment assembly is connected to the mounting plate (31). The trimming assembly includes a mechanism box (51), a rotating plate (52) disposed on one side of the mechanism box (51), and a plurality of milling cutters (53) disposed on the rotating plate (52). The mounting plate (31) has a plurality of parallel slide rails (312) on its side near the clamping assembly (6). The angle adjustment assembly includes a first sliding block (41) that cooperates with the slide rail (312), a sliding drive component that controls the first sliding block (41) to move along the slide rail (312), a motor (42) mounted on the first sliding block (41), and a gear set (43) driven to rotate by the motor (42). One end of the mechanism box (51) is rotatably connected to the first sliding block (41), and the mechanism box (51) cooperates with the gear set (43). The mounting plate (31) has a second slide groove (311) on each side of the mechanism box (51). The angle adjustment assembly also includes two auxiliary support components that correspond one-to-one with the two second slide grooves (311). The auxiliary support components include a second sliding block (44) that slides with the second slide groove (311), and a first connecting rod (45) and a second connecting rod (47) that are rotatably connected to each other at one end by a rotating shaft (46). The other end of the first connecting rod (45) is connected to the second sliding block (44), and the other end of the second connecting rod (47) is connected to the other end of the mechanism box (51). The base (1) includes a workbench (11) and a back plate (12) fixed to one end of the workbench (11). The end of the top surface of the workbench (11) away from the back plate (12) is provided with a clamping surface (111). When in use, the pipe is placed on the clamping surface (111) and clamped by the clamping assembly (6). The base (1) also includes several foot pads (13) disposed on the bottom surface of the workbench (11). On the workbench (11), there is a first sliding groove (112) on each side of the clamping surface (111) that is parallel to each other, and the bottom end of the mounting plate (31) is engaged with the first sliding groove (112).

2. A method for trimming pipe fittings using the high-precision angle trimmer as described in claim 1, characterized in that, Includes the following steps: Step S1: Clamp one end of the pipe fitting with the clamping assembly (6) while making the plane of the pipe fitting centerline perpendicular to the working surface of the trimming assembly. Step S2: Control the angle between the working surface of the trimming component and the surface of the pipe to be trimmed by the control unit, control the trimming component to move closer to the surface of the pipe to be trimmed, and start the trimming component until milling chips appear all around the surface of the pipe to be trimmed, then stop.

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