Pipe laser cutting supporting centering device and centering method thereof

Abstract

The invention belongs to the technical field of pipe cutting, and particularly relates to a pipe laser cutting material supporting and centering device which comprises a machine tool, a front chuck structure and a rear chuck structure which are distributed in the Y direction are arranged on the machine tool, the front chuck structure is provided with a front chuck center L1, the rear chuck structure is provided with a rear chuck center L2, and the rear chuck center L2 and the front chuck center L1 are collinear; a longitudinal limiting mechanism; a transverse limiting mechanism; and a plurality of centering mechanisms are arranged. According to the technical scheme, the height value of the lowest point of the transverse plate for limiting the pipe in the Z direction and the side edge value of the rightmost side of the longitudinal plate for limiting the pipe in the X direction are determined according to the type and the size of the pipe to be cut, and the supporting piece is driven by the transverse moving assembly to move in the X-axis direction till the pipe makes contact with the longitudinal plate; the longitudinal moving assembly is used for driving the supporting piece to move in the Z-axis direction till the pipe makes contact with the transverse plate, the operation that the center point L3 of the pipe is centered with the center L2 of the rear chuck and the center L1 of the front chuck is completed, precision is high, operation is easy, and the application range is wide.

Description

Technical Field

[0001] The invention belongs to the technical field of tube cutting, and in particular relates to a tube laser cutting support centering device and a centering method of the tube laser cutting support centering device. Background Art

[0002] Pipe laser cutting is an efficient and precise processing method, which is often used for cutting metal and non-metallic pipes. It has the advantages of high precision, fast cutting speed, small heat impact and high degree of automation.

[0003] In order to solve the problem of deformation of the cut pipe, a support mechanism is set on the machine body for follow-up support, and a centering mechanism is set on the support mechanism to center the pipe to improve the processing accuracy. The existing centering mechanism is suitable for a single pipe. For example, multiple annularly distributed telescopic rods are set to synchronously extend and retract to support a round pipe, which is only suitable for the centering operation of the round pipe.

[0004] In view of the above problems, a tube laser cutting support centering device and a tube laser cutting support centering method are designed. Summary of the invention

[0005] The present invention aims at solving the problems in the prior art and proposes the following technical solutions:

[0006] The tube laser cutting support centering device includes:

[0007] A machine tool, wherein the machine tool is provided with a front chuck structure and a rear chuck structure distributed in the Y direction, the front chuck structure has a front chuck center L1, the rear chuck structure has a rear chuck center L2, and the rear chuck center L2 and the front chuck center L1 are collinear;

[0008] A longitudinal limiting mechanism, the longitudinal limiting mechanism comprising a horizontal plate that moves in the up-down direction, the horizontal plate limiting the Z direction of the pipe;

[0009] A transverse limiting mechanism, the transverse limiting mechanism comprises a longitudinal plate movable in the left and right directions, the longitudinal plate limiting the X direction of the pipe;

[0010] A plurality of centering mechanisms, each of which comprises a base shell with an upper end opening, wherein a support member, a transverse movement assembly for driving the support member to move in a left-right direction, and a longitudinal movement assembly for driving the support member to move in an up-down direction are arranged inside the base shell;

[0011] Adjust the transverse plate and the longitudinal plate to the predetermined position, place the pipe on the support, and the transverse movement assembly drives the support to move in the left and right direction until the pipe contacts the longitudinal plate, and the longitudinal movement assembly drives the support to move in the up and down direction until the pipe contacts the transverse plate.

[0012] As a preferred embodiment of the above technical solution, the longitudinal limiting mechanism further includes a longitudinally distributed electric push rod 1, and the output end of the electric push rod 1 is connected to the horizontal plate;

[0013] The machine tool is provided with a cavity and a strip groove connecting the cavity and the outside of the machine tool. The electric push rod and the cross plate are assembled inside the cavity. The cross plate passes through the strip groove and extends to the outside of the machine tool.

[0014] As a preferred embodiment of the above technical solution, the lateral limiting mechanism includes a second electric push rod arranged laterally, and the output end of the second electric push rod is connected to the longitudinal plate;

[0015] The transverse plate is provided with a mounting groove 1, the electric push rod 2 is assembled on the side wall of the mounting groove 1, and the longitudinal plate passes through the mounting groove 1.

[0016] As a preferred embodiment of the above technical solution, a roller is rotatably provided on the upper end of the support member, and the roller is arranged parallel to the X direction.

[0017] As a preferred embodiment of the above technical solution, the longitudinal movement assembly includes three longitudinally distributed electric push rods;

[0018] A lower groove is formed at the lower end of the support member, the bottom of the electric push rod 3 is assembled inside the base shell, and the output end of the electric push rod 3 is assembled inside the lower groove.

[0019] As a preferred embodiment of the above technical solution, a side wall of the lower groove is provided with a transversely distributed slide groove three, and an output end of the electric push rod three is connected to a slider three, and the slider three is slidably matched with the slide groove three;

[0020] The transverse movement assembly includes a motor and a frame sleeved on the support member, the output end of the motor is connected to a gear, and the gear is meshed with a rack arranged on the frame;

[0021] The frame is provided with a second slide block, the inner wall of the base shell is provided with a second slide groove, and the second slide block is slidably matched with the second slide groove.

[0022] As a preferred embodiment of the above technical solution, a second installation groove is provided in the longitudinal plate, a longitudinally distributed slide groove is provided on the side wall of the second installation groove, a slider is slidably matched in the slider, and a spring is provided between the slider and the bottom wall of the second installation groove;

[0023] One end of the sliding block three extends to the outside of the lower groove and is connected with a protrusion, the protrusion is higher than the supporting member, and the longitudinal plate is located on the moving path of the protrusion.

[0024] The centering method of the tube laser cutting support centering device according to any one of the above items comprises the following steps:

[0025] S1. Coordinate system generation: Generate a coordinate system with the front chuck center L as the base point. The coordinates of the front chuck center L1 are (X1, Y1, Z1), and the coordinates of the rear chuck center L2 are (X2, Y2, Z2), where X1 is the same as X2, and Z1 is the same as Z2;

[0026] S2. Determine the pipe data: input the pipe data into the operating system of the machine tool, select support points on the pipe whose quantity and position match the centering mechanism, and determine the data of each support point, including the center point L3 (X3, Y3, Z3), the distance A from the extension line of the center point L3 to the top, and the distance B from the extension line of the center point L3 to the side;

[0027] S3, limit mechanism adjustment: assume that the center point L is collinear with L1 and L2, that is, X1, X2, X3 are the same, Z1, Z2, Z3 are the same, adjust the horizontal plate in the up and down direction, and the height value of the lowest point of the horizontal plate is Z1+A;

[0028] Adjust the longitudinal plate to the right and left sides, and the rightmost side value of the longitudinal plate is -X1-B;

[0029] S4. Pipe alignment: Place the pipe on the support, with multiple support points corresponding to multiple support, and the transverse moving assembly drives the pipe to move in the left and right directions until it contacts the longitudinal plate;

[0030] The longitudinal movement assembly drives the pipe to move in the up and down directions until it contacts the horizontal plate.

[0031] The beneficial effects of the present invention are:

[0032] In the technical solution of the device for centering the support for laser cutting of pipes, the lowest point height value of the horizontal plate for limiting the pipe in the Z direction is determined according to the type and size of the pipe to be cut, and the rightmost side value of the vertical plate for limiting the pipe in the X direction is determined. The horizontal movement component is used to drive the support to move in the X-axis direction until the pipe contacts the vertical plate, and the vertical movement component is used to drive the support to move in the Z-axis direction until the pipe contacts the horizontal plate, so as to complete the operation of aligning the center point L3 of the pipe with the center L2 of the rear chuck and the center L1 of the front chuck. The operation has high precision, simple operation and wide application range. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The figure shows a schematic diagram of the structure of the tube laser cutting support centering device in Example 1;

[0034] Figure 2 It is shown that Figure 1 Schematic diagram of the partial structure of the support centering device for medium-sized tube laser cutting;

[0035] Figure 3 It is shown that Figure 2 a schematic cross-sectional view from the middle side;

[0036] Figure 4 It shows Figure 3 Schematic diagram of the local structure;

[0037] Figure 5 What is shown is a schematic diagram of the pipe structure adapted to the pipe laser cutting support centering device in Example 1.

[0038] Reference numerals: machine tool 10; rear chuck structure 12; rear chuck center L2; front chuck structure 11; front chuck center L1; cavity 13; strip groove 131;

[0039] Longitudinal limit mechanism 20; horizontal plate 21; mounting slot 1 211; electric push rod 1 22;

[0040] Horizontal limiting mechanism 30; longitudinal plate 31; second mounting groove 311; first slide groove 312; second electric push rod 32; first slide block 33; spring 34;

[0041] Centering mechanism 40; base shell 41; slide groove 2 411; support member 42; roller 421; lower groove 422; transverse movement assembly 43; motor 431; gear 432; rack 433; frame 434; slide block 2 435; longitudinal movement assembly 44; electric push rod 3 441; slide block 3 442; protrusion 443. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0043] Example 1

[0044] like Figure 1 , Figure 2 , Figure 3 , Figure 5 As shown, the device for centering the material support for laser cutting of a tube comprises: a machine tool 10, on which a front chuck structure 11 and a rear chuck structure 12 distributed in the Y direction are arranged. After the centering operation is performed on the tube, the front chuck structure 11 and the rear chuck structure 12 clamp the tube, and the longitudinal limiting mechanism 20, the transverse limiting mechanism 30 and the centering mechanism 40 avoid the tube, and the machine tool 10 performs a laser cutting operation on the tube. The machine tool 10, the front chuck structure 11 and the rear chuck structure 12 are all mature structures in the prior art and are not described in detail here. The X-axis in this embodiment corresponds to the left-right direction, the Y-axis corresponds to the front-back direction, and the Z-axis corresponds to the up-down direction.

[0045] The front chuck structure 11 has a front chuck center L1, and the rear chuck structure 12 has a rear chuck center L2, and the rear chuck center L2 and the front chuck center L1 are collinear;

[0046] A longitudinal limiting mechanism 20, the longitudinal limiting mechanism 20 comprises a horizontal plate 21 which moves in the vertical direction, and the horizontal plate 21 limits the position of the pipe in the Z direction;

[0047] A transverse limiting mechanism 30, the transverse limiting mechanism 30 comprises a longitudinal plate 31 movable in the left and right directions, the longitudinal plate 31 limits the position of the pipe in the X direction;

[0048] A plurality of centering mechanisms 40, each of which comprises a base shell 41 with an upper end opening, wherein a support member 42, a transverse movement assembly 43 for driving the support member 42 to move in a left-right direction, and a longitudinal movement assembly 44 for driving the support member 42 to move in an up-down direction are arranged inside the base shell 41;

[0049] Adjust the transverse plate 21 and the longitudinal plate 31 to the predetermined positions, place the pipe on the support 42, and the transverse movement component 43 drives the support 42 to move in the left and right direction until the pipe contacts the longitudinal plate 31, and the longitudinal movement component 44 drives the support 42 to move in the up and down direction until the pipe contacts the transverse plate 21.

[0050] The centering method of the tube laser cutting support centering device includes the following steps: In this embodiment, the tube is a round tube as an example,

[0051] S1. Coordinate system generation: Generate a coordinate system with the front chuck center L1 as the base point. The coordinates of the front chuck center L1 are (X1, Y1, Z1), that is, X1, Y1, and Z1 are all 0, and the coordinates of the rear chuck center L2 are (X2, Y2, Z2), where X1 is the same as X2, and Z1 is the same as Z2;

[0052] S2, pipe data determination: input the pipe data into the operating system of the machine tool 10, select support points on the pipe whose quantity and position match the centering mechanism 40, and determine the data of each support point, including the center point L3 (X3, Y3, Z3), the distance A from the extension line of the center point L3 to the top end, A is the outer radius R1 of the pipe, and the distance B from the extension line of the center point L3 to the side end, B is the outer radius R2 of the pipe;

[0053] S3, limit mechanism adjustment: assume that the center point L3 is collinear with L1 and L2, that is, X1, X2, X3 are the same, Z1, Z2, Z3 are the same, adjust the horizontal plate 21 in the vertical direction, the lowest point height value of the horizontal plate 21 is Z1+A, and the lowest point height value of the horizontal plate 21 is R1;

[0054] Adjust the longitudinal plate 31 in the left-right direction to the right, the rightmost side value of the longitudinal plate 31 is -X1-B, and the rightmost side value of the longitudinal plate 31 is -R2;

[0055] S4, pipe centering: the pipe is placed on the support member 42, and multiple support points correspond to multiple support members 42 respectively, and the transverse moving assembly 43 drives the pipe to move in the left and right directions until it abuts against the longitudinal plate 31;

[0056] The longitudinal moving assembly 44 drives the pipe to move in the vertical direction until it contacts the transverse plate 21 . At this time, L3 is in line with L1 and L2 , and the centering operation is completed.

[0057] In the technical solution of the device for centering the support for laser cutting of pipes, the lowest point height value of the transverse plate 21 for limiting the pipe in the Z direction is determined according to the type and size of the pipe to be cut, and the rightmost side value of the longitudinal plate 31 for limiting the pipe in the X direction is determined. The transverse movement component 43 is used to drive the support member 42 to move in the X-axis direction until the pipe contacts the longitudinal plate 31, and the longitudinal movement component 44 is used to drive the support member 42 to move in the Z-axis direction until the pipe contacts the transverse plate 21, thereby completing the operation of aligning the center point L3 of the pipe with the rear chuck center L2 and the front chuck center L1. The operation has high precision, simple operation, and wide applicability.

[0058] In order to solve the need for the horizontal plate 21 to move in the up and down directions, as Figure 3 As shown, the longitudinal limiting mechanism 20 also includes a longitudinally distributed electric push rod 22, and the output end of the electric push rod 22 is connected to the horizontal plate 21; by controlling the change of the overall length of the electric push rod 22, the horizontal plate 21 is controlled to move in the up and down directions.

[0059] In order to solve the distribution and installation problem of the longitudinal limit mechanism 20, a cavity 13 and a strip groove 131 connecting the cavity 13 and the outside of the machine tool 10 are opened on the machine tool 10, and the electric push rod 22 and the cross plate 21 are assembled inside the cavity 13, and the cross plate 21 passes through the strip groove 131 and extends to the outside of the machine tool 10.

[0060] The extension or contraction of the electric push rod 1 22 drives the horizontal plate 21 to move upward or downward inside the cavity 13 and the strip groove 131, so that the longitudinal limiting mechanism 20 limits the pipe in the Z-axis direction.

[0061] In order to realize the movement requirement of the longitudinal plate 31 in the left and right directions, as Figure 3 As shown, the transverse limiting mechanism 30 includes a transversely arranged electric push rod 2 32 , and the output end of the electric push rod 2 32 is connected to the longitudinal plate 31 ; by controlling the change of the overall length of the electric push rod 2 32 , the longitudinal plate 31 is controlled to move in the left and right directions.

[0062] In order to solve the problem of distributed installation of the transverse limiting mechanism 30 and installation coordination of the transverse limiting mechanism 30 and the longitudinal limiting mechanism 20, a mounting groove 211 is opened on the transverse plate 21, the electric push rod 2 32 is assembled on the side wall of the mounting groove 211, and the longitudinal plate 31 passes through the mounting groove 211.

[0063] The second electric push rod 32 is extended or shortened, driving the longitudinal plate 31 to move to the right or left in the first installation groove 211, so that the transverse limiting mechanism 30 limits the position of the pipe in the X-axis direction.

[0064] The transverse limiting mechanism 30 is installed in the installation groove 211 on the transverse plate 21, and is reasonably distributed to reduce the occupied space. A set of longitudinal limiting mechanisms 20 and transverse limiting mechanisms 30 corresponds to one centering mechanism 40, reducing the supporting points that need to be determined.

[0065] To improve the convenience of placing the pipe on the support 42, as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, a roller 421 is rotatably provided at the upper end of the support member 42, and the roller 421 is arranged parallel to the X direction.

[0066] The setting of the roller 421 changes the sliding friction between the tube and the support 42 into the rolling friction between the tube and the roller 421. When the tube is placed on the support 42, it is convenient to move the tube in the Y-axis direction, and it is convenient to move the tube to multiple support points to match the corresponding centering mechanisms 40.

[0067] In order to realize the arrangement of driving the support member 42 to move in the up and down directions in the base shell 41, as shown in FIG. Figure 3 , Figure 4 As shown, the longitudinal movement assembly 44 includes a longitudinally distributed electric push rod 3 441; by controlling the change in the overall length of the electric push rod 3 441, the support member 42 is driven to move in the up and down direction (Z-axis direction).

[0068] A lower groove 422 is formed at the lower end of the support member 42 , the bottom of the electric push rod 3 441 is assembled inside the base shell 41 , and the output end of the electric push rod 3 441 is assembled inside the lower groove 422 .

[0069] like Figure 3 , Figure 4 As shown, the side wall of the lower groove 422 is provided with a transversely distributed slide groove three, the output end of the electric push rod three 441 is connected to the slider three 442, and the slider three 442 is slidably matched with the slide groove three;

[0070] The transverse movement assembly 43 includes a motor 431 and a frame 434 mounted on the support member 42. The output end of the motor 431 is connected to a gear 432, and the gear 432 is meshed with a rack 433 arranged on the frame 434. A slider 435 is arranged on the frame 434, and a slide groove 411 is opened on the inner wall of the base shell 41. The slider 435 slidably cooperates with the slide groove 411 to limit the frame 434 when it moves in the left and right directions.

[0071] In the transverse movement assembly 43 , the forward or reverse rotation of the motor 431 drives the frame 434 to move in the left-right direction through the rack 433 meshing with the gear 432 , thereby realizing the movement of the support member 42 in the left-right direction (X-axis direction).

[0072] In the centering mechanism 40, the electric push rod 3 441 of the longitudinal movement component 44 is arranged inside the lower groove 422, and the slider 3 442 is slidably matched with the slide groove 3, which does not affect the transverse movement component 43 driving the support member 42 to move in the left and right directions; the frame 434 of the transverse movement component 43 is sleeved on the outside of the support member 42, which does not affect the longitudinal movement component 44 driving the support member 42 to move in the up and down directions; the position distribution of the transverse movement component 43 and the longitudinal movement component 44 is reasonable, and they cooperate with each other to achieve the requirements of the centering setting of the pipe.

[0073] After the X-axis position of the longitudinal plate 31 and the Y-axis position of the transverse plate 21 are determined, the support member 42 drives the pipe to move. There is a situation where the left end of the support member 42 contacts the right end of the longitudinal plate 31, and the support member 42 cannot drive the pipe to move in the X-axis direction. To solve the above problem, Figure 3 , Figure 4 As shown, a second mounting groove 311 is provided in the longitudinal plate 31, a longitudinally distributed slide groove 1 312 is provided on the side wall of the second mounting groove 311, a slider 1 33 is slidably fitted in the slide groove 1 312, and a spring 34 is provided between the slider 1 33 and the bottom wall of the second mounting groove 311; one end of the slider 3 442 extends to the outside of the lower groove 422 and is connected to a protrusion 443, the protrusion 443 is higher than the support member 42, and the longitudinal plate 31 is located on the moving path of the protrusion 443.

[0074] When the lower end of the longitudinal plate 31 is pushed by the protrusion 443, the longitudinal plate 31 moves upward. At this time, the spring 34 is compressed, the slider 33 slides with the slide groove 312, and the longitudinal plate 31 is reset under the action of the spring 34 after the longitudinal plate 31 is no longer under force.

[0075] When the support member 42 gradually drives the tube to move upward, the protrusion 443 first contacts the longitudinal plate 31, driving the longitudinal plate 31 to move upward, so that the longitudinal plate 31 is always higher than the support member 42, avoiding the longitudinal plate 31 affecting the movement of the support member 42, ensuring that the support member 42 drives the tube to contact with the transverse plate 21 in the Z-axis direction, and drives the tube to contact with the longitudinal plate 31 in the X-axis direction.

[0076] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A device for centering the support material for laser cutting of pipes, characterized in that: include: A machine tool (10), wherein the machine tool (10) is provided with a front chuck structure (11) and a rear chuck structure (12) distributed in the Y direction, the front chuck structure (11) having a front chuck center L1, the rear chuck structure (12) having a rear chuck center L2, and the rear chuck center L2 and the front chuck center L1 are collinear; A longitudinal limiting mechanism (20), the longitudinal limiting mechanism (20) comprising a horizontal plate (21) movable in the up-down direction, the horizontal plate (21) limiting the position of the pipe in the Z direction; A transverse limiting mechanism (30), the transverse limiting mechanism (30) comprising a longitudinal plate (31) movable in the left-right direction, the longitudinal plate (31) limiting the position of the pipe in the X direction; A plurality of centering mechanisms (40), the centering mechanisms (40) comprising a base shell (41) with an upper end opening, the base shell (41) being provided with a support member (42), a transverse movement assembly (43) for driving the support member (42) to move in a left-right direction, and a longitudinal movement assembly (44) for driving the support member (42) to move in an up-down direction; The transverse plate (21) and the longitudinal plate (31) are adjusted to predetermined positions, the pipe is placed on the support member (42), the transverse moving assembly (43) drives the support member (42) to move in the left-right direction until the pipe contacts the longitudinal plate (31), and the longitudinal moving assembly (44) drives the support member (42) to move in the up-down direction until the pipe contacts the transverse plate (21).

2. The tube laser cutting support centering device according to claim 1 is characterized in that: The longitudinal limiting mechanism (20) further comprises a longitudinally distributed electric push rod 1 (22), wherein the output end of the electric push rod 1 (22) is connected to the transverse plate (21); The machine tool (10) is provided with a cavity (13) and a strip groove (131) connecting the cavity (13) and the outside of the machine tool (10); the electric push rod (22) and the cross plate (21) are assembled inside the cavity (13); the cross plate (21) passes through the strip groove (131) and extends to the outside of the machine tool (10).

3. The tube laser cutting support centering device according to claim 2 is characterized in that: The transverse limiting mechanism (30) comprises a second electric push rod (32) arranged transversely, and the output end of the second electric push rod (32) is connected to the longitudinal plate (31); The transverse plate (21) is provided with a mounting groove (211), the electric push rod (32) is mounted on the side wall of the mounting groove (211), and the longitudinal plate (31) passes through the mounting groove (211).

4. The tube laser cutting support centering device according to claim 1, characterized in that: A roller (421) is rotatably arranged at the upper end of the support member (42), and the roller (421) is arranged parallel to the X direction.

5. The tube laser cutting support centering device according to claim 1, characterized in that: The longitudinal movement assembly (44) includes three longitudinally distributed electric push rods (441); The lower end of the support member (42) is provided with a lower groove (422), the bottom of the electric push rod three (441) is assembled inside the base shell (41), and the output end of the electric push rod three (441) is assembled inside the lower groove (422).

6. The tube laser cutting support centering device according to claim 5, characterized in that: The side wall of the lower groove (422) is provided with a transversely distributed slide groove three, the output end of the electric push rod three (441) is connected with a slider three (442), and the slider three (442) is slidably matched with the slide groove three; The transverse movement assembly (43) comprises a motor (431) and a frame (434) sleeved on the support member (42); the output end of the motor (431) is connected to a gear (432), and the gear (432) is meshed with a rack (433) arranged on the frame (434); The frame (434) is provided with a second slide block (435), the inner wall of the base shell (41) is provided with a second slide groove (411), and the second slide block (435) is slidably matched with the second slide groove (411).

7. The tube laser cutting support centering device according to claim 6, characterized in that: The longitudinal plate (31) is provided with a second installation groove (311), a longitudinally distributed slide groove (312) is provided on the side wall of the second installation groove (311), a slider (33) is slidably matched in the slider (312), and a spring (34) is provided between the slider (33) and the bottom wall of the second installation groove (311); One end of the slider (442) extends to the outside of the lower groove (422) and is connected to a protrusion (443). The protrusion (443) is higher than the support member (42), and the longitudinal plate (31) is located on the moving path of the protrusion (443).

8. The centering method of the tube laser cutting support centering device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Coordinate system generation: Generate a coordinate system with the front chuck center L1 as the base point. The coordinates of the front chuck center L1 are (X1, Y1, Z1), and the coordinates of the rear chuck center L2 are (X2, Y2, Z2), where X1 is the same as X2, and Z1 is the same as Z2; S2, determining the pipe data: inputting the pipe data into the operating system of the machine tool (10), selecting support points on the pipe whose number and position match the centering mechanism (40), and determining the data of each support point, including the center point L3 (X3, Y3, Z3), the distance A from the extension line of the center point L3 to the top end, and the distance B from the extension line of the center point L3 to the side end; S3, limit mechanism adjustment: assume that the center point L3 is collinear with L1 and L2, that is, X1, X2, X3 are the same, Z1, Z2, Z3 are the same, and adjust the horizontal plate (21) in the vertical direction to the position where the lowest point height of the horizontal plate (21) is Z1+A; Adjust the longitudinal plate (31) to the right position in the left-right direction, and the rightmost side value of the longitudinal plate (31) is -X1-B; S4, pipe centering: placing the pipe on the support member (42), with multiple support points corresponding to multiple support members (42), and the transverse moving assembly (43) driving the pipe to move in the left-right direction until it abuts against the longitudinal plate (31); The longitudinal moving assembly (44) drives the pipe to move in the up-down direction until it contacts the transverse plate (21).

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