Three-dimensional laser cutting device and method for tubular workpiece

Abstract

The invention relates to the technical field of cutting, in particular to a three-dimensional laser cutting device and method for a tubular workpiece. The rotating mechanism comprises a first panel and a cross-shaped bottom plate, the first panel is installed on the workbench, the cross-shaped bottom plate is used for bearing a workpiece, and the cross-shaped bottom plate is rotationally connected with the first panel through a driven gear, a first output motor and a driving gear; the bottom of the cross-shaped bottom plate is connected with the driven gear, the driven gear is rotationally installed on the first panel, a first output motor is installed below the first panel, the output end of the first output motor penetrates through the first panel and is connected with a driving gear, and the driving gear is meshed with the driven gear. The center of the driven gear and the center of the cross-shaped bottom plate are coaxial. On the basis of the X axis, the Y axis and the Z axis, the rotating shaft is additionally arranged, it can be better guaranteed that a welding head is perpendicular to a cut face all the time for a workpiece of a rotary structure, and the welding effect is improved.

Description

Technical Field

[0001] The invention relates to the field of cutting technology, in particular to a three-dimensional laser cutting device for a tubular workpiece and a cutting method thereof. Background Art

[0002] As an advanced material processing method, laser cutting technology has been widely used in the field of metal material processing due to its non-contact processing, small heat-affected zone, fast cutting speed and high precision.

[0003] With the increasing demand for high-precision and high-efficiency processing in the manufacturing industry, traditional two-dimensional laser cutting technology has gradually been unable to meet the processing needs of complex-shaped workpieces. Three-dimensional laser cutting technology has emerged. Through multi-axis linkage control, it has achieved all-round and multi-directional cutting of workpieces; however, when facing workpieces with rotating body characteristics such as tubular ones, the existing laser cutting device has certain limitations. The essence is that laser cutting cannot always be perpendicular to the cut surface, which is not conducive to cutting quality. Summary of the invention

[0004] In view of the problems in the prior art, the present invention provides a three-dimensional laser cutting device and a cutting method for a tubular workpiece. The specific technical scheme is as follows:

[0005] On the one hand, the present application provides a three-dimensional laser cutting device for a tubular workpiece, comprising:

[0006] Workbench;

[0007] A rotating mechanism, the rotating mechanism comprising a panel 1 and a cross bottom plate, the panel 1 is mounted on a workbench, the cross bottom plate is used to carry a workpiece, the cross bottom plate is rotatably connected to the panel 1 through a driven gear, an output motor 1 and a driving gear; the bottom of the cross bottom plate is connected to the driven gear, the driven gear is rotatably mounted on the panel 1, an output motor 1 is mounted below the panel 1, the output end of the output motor 1 passes through the panel 1 and is connected to the driving gear, the driving gear meshes with the driven gear, and the center of the driven gear is coaxial with the center of the cross bottom plate;

[0008] A multi-axis linkage mechanism, the multi-axis linkage mechanism comprising a panel 2, an X-axis driving assembly for driving the welding head to slide along the X-axis direction, a Z-axis driving assembly for driving the welding head to slide along the Z-axis, and a Y-axis driving assembly for driving the welding head to slide along the Y-axis direction;

[0009] And a welding head, which is installed on the multi-axis linkage mechanism and has an output end facing the workpiece.

[0010] As a further technical solution of the present invention, the rotating mechanism further includes a tensioning assembly;

[0011] The tensioning assembly includes a slide rail, two groups of expansion plates, a screw rod, a hand wheel and a column. The slide rail is laid on the cross base plate along the X-axis direction. The two groups of expansion plates are slidably set on the slide rail and are symmetrical relative to the center of the cross base plate. The screw rod is rotatably set above the cross base plate and parallel to the slide rail. The screw rod is rotatably connected to the two expansion plates and is divided into two parts by the two expansion plates. The two parts of the screw rod have opposite thread patterns. The hand wheel is connected to one end of the screw rod. The column is laid in two rows equidistantly along the X-axis trajectory, and the two rows of columns are symmetrically distributed relative to the center of the cross base plate.

[0012] As a further technical solution of the present invention, the rotating mechanism further includes a clamping assembly;

[0013] The clamping assembly includes two slide rails, two groups of clamping plates, two screw rods, two hand wheels and two columns. The two slide rails are laid on the cross base plate along the Y-axis direction, and the two groups of clamping plates are slidably set on the two slide rails and are symmetrical relative to the center of the cross base plate. The two screw rods are rotatably set above the cross base plate and parallel to the two slide rails. The two screw rods are rotatably connected to the two clamping plates and are divided into two parts by the two clamping plates. The two parts of the two screw rods have opposite thread patterns. The two hand wheels are connected to one end of the two screw rods. The two columns are laid in two rows equidistantly along the Y-axis trajectory, and the two rows of two columns are symmetrically distributed relative to the center of the cross base plate.

[0014] As a further technical solution of the present invention, the tensioning assembly and the clamping assembly are cross-arranged on the cross base plate and correspond to the shape of the cross base plate, and in the tensioning assembly and the clamping assembly, the screw rod 1 and the screw rod 2 are staggered on the Z axis.

[0015] As a further technical solution of the present invention, the X-axis drive assembly includes a slide rail three, an output motor two, a screw rod three and a support plate one. The slide rail three is laid on the panel two along the X-axis direction. The output motor two is installed on the panel two and is located on one side of the slide rail three. The screw rod three is connected to the output end of the output motor two and is parallel to the slide rail three. The support plate one is slidably connected to the slide rail three and is rotationally connected to the screw rod three.

[0016] As a further technical solution of the present invention, the Z-axis drive assembly includes a slide rail four, an output motor three, a screw rod four and a support plate two. The slide rail four is laid on the support plate one along the Z-axis direction, the output motor three is installed on the end of the slide rail four away from the support plate one, the screw rod four is connected to the output end of the output motor three and is parallel to the laying direction of the slide rail four, and the support plate two is slidably connected to the slide rail four and is rotationally connected to the screw rod four.

[0017] As a further technical solution of the present invention, the Y-axis drive assembly includes a slide rail five, a push rod and a support plate three. The slide rail three is laid on the support plate two along the Z-axis direction. The push rod is installed on the slide rail five and is located on the side thereof away from the workpiece. The support plate three is connected to the output end of the push rod and is slidably connected to the slide rail five.

[0018] On the other hand, the present application also provides a cutting method of a tubular workpiece three-dimensional laser cutting device, the specific steps of which are as follows:

[0019] S1, place the workpiece;

[0020] Align the center of the workpiece with the center of the cross bottom plate, and place the workpiece on the cross bottom plate, with the two expansion plates covered by the workpiece, and the two clamping plates distributed on the outer sides of the workpiece;

[0021] S2, tighten the workpiece;

[0022] Turning hand wheel 1 drives screw rod 1 and expansion plate to rotate relative to each other and forces the two expansion plates to move away from each other to tighten the workpiece from inside to outside;

[0023] S3, clamping the workpiece;

[0024] Turn the second hand wheel to drive the second screw rod and the clamping plate to rotate relative to each other and force the two expansion plates to approach each other to clamp the workpiece from the outside to the inside, so that the workpiece is centered;

[0025] S4, adjust the position of the welding head on the X axis;

[0026] Start the output motor 2 to drive the screw rod 3 to rotate and drive the support plate 1 and the welding head to slide along the X-axis track until the welding head output head is perpendicular to the workpiece. At this time, the output motor 2 stops and the position of the welding head on the X-axis is locked. The output direction of the welding head is always perpendicular to the cut surface.

[0027] S5, adjust the position of the welding head on the Y axis;

[0028] Start the push rod to drive the support plate and the welding head on the Y axis until the distance between the welding head and the workpiece meets the welding conditions;

[0029] S6, adjust the position of the welding head on the Z axis and cooperate with the rotating axis for welding;

[0030] By starting the output motor three, the lead screw four can be driven to rotate to drive the welding head to slide on the Z axis. At the same time, the output motor one is started to drive the driven gear and the workpiece to rotate, thereby welding the circumference of the workpiece.

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

[0032] (1) In the present application, a rotation axis is added on the basis of the X, Y, and Z axes, so as to better target the workpiece with a rotating structure, ensure that the welding head is always perpendicular to the cut surface, and improve the welding effect.

[0033] (2) In the present application, a tensioning assembly and a clamping assembly are provided to cooperate with each other, and the cooperation from inside to outside and from outside to inside is adopted to ensure the stability of the workpiece during cutting, and the tensioning and clamping is used to achieve the centering of the workpiece to ensure stability during rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The overall structural schematic diagram of the three-dimensional laser cutting device for tubular workpieces is shown;

[0035] Figure 2 The schematic diagram of the structure of the multi-axis linkage mechanism and the welding head is shown;

[0036] Figure 3 A schematic diagram of the structure of the rotating mechanism is shown;

[0037] Figure 4 The schematic diagram of the structure of the driven gear, output motor 1 and driving gear is shown.

[0038] Description of the drawings: 100, workbench; 200, rotating mechanism; 210, panel 1; 220, cross bottom plate; 230, tensioning assembly; 231, slide rail 1; 232, expansion plate; 233, screw rod 1; 234, hand wheel 1; 235, column 1; 240, clamping assembly; 241, slide rail 2; 242, clamping plate; 243, screw rod 2; 244, hand wheel 2; 245, column 2; 250, driven gear; 260, output motor 1; 270, Driving gear; 300, multi-axis linkage mechanism; 310, panel two; 320, X-axis drive assembly; 321, slide rail three; 322, output motor two; 323, screw rod three; 324, support plate one; 330, Z-axis drive assembly; 331, slide rail four; 332, output motor three; 333, screw rod four; 334, support plate two; 340, Y-axis drive assembly; 341, slide rail five; 342, push rod; 343, support plate three; 400, welding head. DETAILED DESCRIPTION

[0039] 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.

[0040] Figure 1 The overall structural schematic diagram of the three-dimensional laser cutting device for tubular workpieces is shown; Figure 1In the figure, the three-dimensional laser cutting device for tubular workpieces includes a workbench 100, a rotating mechanism 200, a multi-axis linkage mechanism 300 and a welding head 400. The workbench 100 is installed on the ground and is used to support the table top. The rotating mechanism 200 and the multi-axis linkage mechanism 300 are both installed on the workbench 100 and arranged closely together. The rotating mechanism 200 is used to fix the pipe fittings. The welding head 400 is installed at the output end of the multi-axis linkage mechanism 300. The multi-axis linkage mechanism 300 can drive the welding head 400 to translate on the X, Y and Z axes to achieve position change in space. The output end of the welding head 400 faces the workpiece on the rotating mechanism 200.

[0041] Figure 2 A schematic diagram of the structure of a multi-axis linkage mechanism 300 and a welding head 400 is shown; Figure 2In the embodiment, the multi-axis linkage mechanism 300 includes a panel 2 310, an X-axis drive assembly 320, a Z-axis drive assembly 330 and a Y-axis drive assembly 340, wherein the panel 2 310 is connected to the workbench 100 by bolts, carries the entire multi-axis linkage mechanism 300, and can separate the entire multi-axis linkage mechanism 300 from the workbench 100 during disassembly, thereby improving the maneuverability of the entire multi-axis linkage mechanism 300; the X-axis drive assembly 320 is used to drive the welding head 400 to slide along the X-axis direction, and the X-axis drive assembly 320 includes a slide rail 321, an output motor 2 322, a screw rod 323 and a support plate 1 324, the slide rail 321 is laid on the panel 2 310 along the X-axis direction, and the output motor 2 322 is installed on the panel The second 310 is on the second 310 and is located on one side of the slide rail three 321. The screw rod three 323 is connected to the output end of the output motor two 322 and is parallel to the slide rail three 321. The support plate one 324 is slidably connected to the slide rail three 321 and is rotatably connected to the screw rod three 323. Among them, the output motor two 322 serves as a power source for driving the support plate one 324 to move, the screw rod three 323 serves as a transmission member for driving the support plate one 324 to slide, and the slide rail three 321 serves as a trajectory limiting member for limiting the sliding of the support plate one 324. When the output motor two 322 drives the screw rod three 323 to rotate, the slide rail three 321 limits the support plate one 324 to force the support plate one 324 and the screw rod three 323 to rotate relative to each other, and the screw rod three 323 and the support plate one 324 are threaded. The Z-axis driving assembly 330 is used to drive the welding head 400 to slide along the Z-axis. The Z-axis driving assembly 330 includes a slide rail 4 331, an output motor 332, a screw rod 4 333 and a support plate 2 334. The slide rail 4 331 is laid on the support plate 1 324 along the Z-axis direction. The output motor 332 is installed on the end of the slide rail 4 331 away from the support plate 1 324. The screw rod 4 333 is connected to the output end of the output motor 332 and is parallel to the laying direction of the slide rail 4 331. The support plate 2 334 is slidably connected to the slide rail 4 331 and is rotatably connected to the screw rod 4 333. Among them, the output motor 332 serves as a power source for driving the support plate 2 334 to move. The screw rod 4 333 33 is used as a transmission member for driving the second support plate 334 to slide, and the fourth slide rail 331 is used as a trajectory limiting member for limiting the sliding of the second support plate 334. When the output motor 332 drives the fourth screw rod 333 to rotate, the fourth slide rail 331 limits the second support plate 334 to force the second support plate 334 and the fourth screw rod 333 to rotate relative to each other, and the fourth screw rod 333 and the second support plate 334 are threadedly matched to drive the second support plate 334 to slide. In addition, since the fourth slide rail 331 of the cornerstone of the entire Z-axis driving assembly 330 is installed on the first support plate 324, the entire Z-axis driving assembly 330 will move along the X-axis direction with the first support plate 324, and the Z-axis driving of the Z-axis driving assembly 330 is based on this.The Y-axis driving assembly 340 is used to drive the welding head 400 to slide along the Y-axis direction. The Y-axis driving assembly 340 includes a slide rail 5 341, a push rod 342 and a support plate 343. The slide rail 321 is laid on the support plate 2 334 along the Z-axis direction. The push rod 342 is installed on the slide rail 5 341 and is located on the side away from the workpiece. The support plate 343 is connected to the output end of the push rod 342 and is slidably connected to the slide rail 5 341. The push rod 342 is used to drive the support plate 343 to move. The slide rail 5 341 is used as a track limiting member to limit the sliding of the support plate 3 343. When the push rod 342 drives the support plate 3 343 to slide, the support plate 3 343 will slide on the surface of the slide rail 5 341 and along the Y-axis path. The welding head 400 is installed on the support plate 3 343 and the output end faces the workpiece. Here, the push rod 342 is used as a power source to drive the welding head 400 to move on the Y-axis in order to improve the accuracy and accurately ensure the accuracy of the welding head 400 when it contacts the workpiece. ;

[0042] Figure 3 shows a schematic structural diagram of the rotating mechanism 200; Figure 3In the embodiment, the rotating mechanism 200 includes a panel 210, a cross bottom plate 220, a tensioning assembly 230 and a clamping assembly 240, wherein the panel 210 is used as a support member of the entire rotating mechanism 200, and is connected to the workbench 100 by bolts, so that the rotating mechanism 200 can be transferred as a whole during disassembly, and the cross bottom plate 220 is installed on the panel 210. The cross bottom plate 220 is used as a bearing member for the workpiece. When the workpiece is placed vertically, the end of the workpiece is placed on the cross bottom plate 220 to keep the workpiece in a vertical state; the tensioning assembly 230 and the clamping assembly 240 are cross-arranged on the cross bottom plate 2 20 and corresponds to the shape of the cross bottom plate 220, that is, the tensioning assembly 230 and the clamping assembly 240 are vertically crossed to form a "cross" structure, and this "cross" structure is consistent with the shape of the cross bottom plate 220, and the two match each other on the projection surface; the tensioning assembly 230 includes a slide rail 231, two sets of expansion plates 232, a screw rod 233, a hand wheel 234 and a column 235, the slide rail 231 is laid on the cross bottom plate 220 along the X-axis direction, the two sets of expansion plates 232 are both slidably arranged on the slide rail 231 and are symmetrical relative to the center of the cross bottom plate 220, and the screw rod 233 is rotatably arranged on the slide rail 231. The screw rod 233 is rotatably connected to the two expansion plates 232 and is divided into two parts by the two expansion plates 232. The thread patterns of the two parts of the screw rod 233 are opposite. The hand wheel 234 is connected to one end of the screw rod 233. Two rows of columns 235 are equidistantly laid along the X-axis track. The two rows of columns 235 are symmetrically distributed relative to the center of the cross bottom plate 220. The two rows of columns 235 can limit the position of the workpiece in advance, so that the workpiece is pre-limited within a certain range, and the workpiece is covered with two expansion plates 232. At this time, the worker can manually The hand wheel 234 is turned to drive the screw rod 233 to rotate, and the expansion plate 232 is restricted by the slide rail 231, so that the screw rod 233 and the expansion plate 232 rotate relative to each other, and the screw rod 233 and the expansion plate 232 are threadedly connected, so the expansion plate 232 will move along the X-axis direction. Due to the interference of the opposite thread patterns of the two parts of the screw rod 233, the two expansion plates 232 move in opposite directions, that is, they move to the side away from the center of the cross base plate 220, tightening and fixing the workpiece from the inside to the outside. It should be noted here that in the initial state, the two expansion plates 232 are close to each other and reach the minimum distance.

[0043] The clamping assembly 240 includes a second slide rail 241, two groups of clamping plates 242, a second screw rod 243, a second hand wheel 244 and a second column 245. The second slide rail 241 is laid on the cross bottom plate 220 along the Y-axis direction. The two groups of clamping plates 242 are both slidably set on the second slide rail 241 and are symmetrical relative to the center of the cross bottom plate 220. The second screw rod 243 is rotatably set above the cross bottom plate 220 and parallel to the second slide rail 241. The second screw rod 243 is rotatably connected to the two clamping plates 242 and is divided into two parts by the two clamping plates 242. The two parts of the second screw rod 243 have opposite thread patterns. The second hand wheel 244 is connected to one end of the second screw rod 243. The second column 245 is laid in two rows equidistantly along the Y-axis trajectory. The two rows of the second column 245 are symmetrically distributed relative to the center of the cross bottom plate 220; the two rows of the second column 245 can cooperate with the two rows of the first column 235 to pre-limit the workpiece The position of the workpiece is pre-restricted within a certain range. At this time, the worker can manually crank the hand wheel 244 to drive the screw rod 243 to rotate. The clamping plate 242 is restricted by the slide rail 241, so that the screw rod 243 and the clamping plate 242 rotate relative to each other, and cooperate with the threaded connection between the screw rod 243 and the clamping plate 242, so the clamping plate 242 will move along the Y-axis direction. Affected by the opposite interference of the thread patterns of the two parts of the screw rod 243, the two clamping plates 242 move in opposite directions, that is, move toward the side close to the center of the cross bottom plate 220, clamping and fixing the workpiece from the outside to the inside. It should be noted here that, in the initial state, the two expansion plates 232 are away from each other and reach the maximum distance; through the cooperation of the tensioning assembly 230 and the clamping assembly 240, the workpiece can be clamped in a centered manner, that is, the center of the workpiece coincides with the center of the cross bottom plate 220.

[0044] In the tensioning assembly 230 and the clamping assembly 240, the screw rod 1 233 and the screw rod 243 are staggered on the Z axis; this is to avoid interference between the two and facilitate simultaneous rotation of the two.

[0045] Figure 4 It shows a schematic structural diagram of a driven gear 250, an output motor 260 and a driving gear 270; Figure 4 In the figure, a driven gear 250 is connected to the bottom of the cross bottom plate 220, and the driven gear 250 is rotatably installed on the panel 1 210. An output motor 260 is installed below the panel 1 210. The output end of the output motor 260 passes through the panel 1 210 and is connected to a driving gear 270. The driving gear 270 meshes with the driven gear 250, and the center of the driven gear 250 is coaxial with the center of the cross bottom plate 220. When the output motor 260 is started, the driving gear 270 can be driven to rotate, thereby driving the driven gear 250 to rotate. On the basis of the X, Y, and Z axes, a rotating axis is added, which can better target the workpiece of the rotating structure, ensure that the welding head 400 is always perpendicular to the cut surface, and improve the welding effect.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A three-dimensional laser cutting device for tubular workpieces, characterized in that: include: Workbench(100); The rotating mechanism (200) comprises a panel (210) and a cross bottom plate (220), wherein the panel (210) is mounted on a workbench (100), the cross bottom plate (220) is used to carry a workpiece, and the cross bottom plate (220) is rotatably connected to the panel (210) via a driven gear (250), an output motor (260) and a driving gear (270); the bottom of the cross bottom plate (220) is connected to The driven gear (250) is rotatably mounted on the panel one (210); an output motor one (260) is mounted below the panel one (210); an output end of the output motor one (260) passes through the panel one (210) and is connected to a driving gear (270); the driving gear (270) meshes with the driven gear (250); and the center of the driven gear (250) is coaxial with the center of the cross bottom plate (220); A multi-axis linkage mechanism (300), the multi-axis linkage mechanism (300) comprising a second panel (310), an X-axis driving assembly (320) for driving the welding head (400) to slide along the X-axis direction, a Z-axis driving assembly (330) for driving the welding head (400) to slide along the Z-axis, and a Y-axis driving assembly (340) for driving the welding head (400) to slide along the Y-axis direction; and a welding head (400), wherein the welding head (400) is mounted on the multi-axis linkage mechanism (300) and the output end faces the workpiece.

2. The three-dimensional laser cutting device for tubular workpieces according to claim 1, characterized in that: The rotating mechanism (200) further includes a tensioning assembly (230); The tensioning assembly (230) comprises a slide rail (231), two sets of expansion plates (232), a screw rod (233), a hand wheel (234) and a column (235); the slide rail (231) is laid on the cross bottom plate (220) along the X-axis direction; the two sets of expansion plates (232) are both slidably arranged on the slide rail (231) and are symmetrical relative to the center of the cross bottom plate (220); the screw rod (233) is rotatably arranged on the cross bottom plate (220) The guide rail 1 (231) is parallel to the guide rail 1 (231), the guide rod 1 (233) is rotatably connected to the two expansion plates (232) and is divided into two parts by the two expansion plates (232), the thread patterns on the two parts of the guide rod 1 (233) are opposite, the hand wheel 1 (234) is connected to one end of the guide rod 1 (233), and the column 1 (235) is equidistantly arranged in two rows along the X-axis trajectory, and the two rows of column 1 (235) are symmetrically distributed relative to the center of the cross base plate (220).

3. The three-dimensional laser cutting device for tubular workpieces according to claim 2, characterized in that: The rotating mechanism (200) further comprises a clamping assembly (240); The clamping assembly (240) comprises a second slide rail (241), two groups of clamping plates (242), a second screw rod (243), a second hand wheel (244) and a second column (245). The second slide rail (241) is laid on the cross bottom plate (220) along the Y-axis direction. The two groups of clamping plates (242) are both slidably arranged on the second slide rail (241) and are symmetrical relative to the center of the cross bottom plate (220). The second screw rod (243) is rotatably arranged on the cross bottom plate (220). The second screw rod (243) is rotatably connected to the two clamping plates (242) and is divided into two parts by the two clamping plates (242). The thread patterns on the two parts of the second screw rod (243) are opposite. The second hand wheel (244) is connected to one end of the second screw rod (243). The second column (245) is equidistantly arranged in two rows along the Y-axis trajectory. The two rows of the second column (245) are symmetrically distributed relative to the center of the cross base plate (220).

4. The three-dimensional laser cutting device for tubular workpieces according to claim 3, characterized in that: The tensioning assembly (230) and the clamping assembly (240) are cross-arranged on the cross base plate (220) and correspond to the shape of the cross base plate (220), and in the tensioning assembly (230) and the clamping assembly (240), the screw rod 1 (233) and the screw rod 2 (243) are staggered on the Z axis.

5. The three-dimensional laser cutting device for tubular workpieces according to claim 4, characterized in that: The X-axis driving assembly (320) comprises a slide rail three (321), an output motor two (322), a screw rod three (323) and a support plate one (324); the slide rail three (321) is laid on the panel two (310) along the X-axis direction; the output motor two (322) is installed on the panel two (310) and is located on one side of the slide rail three (321); the screw rod three (323) is connected to the output end of the output motor two (322) and is parallel to the slide rail three (321); the support plate one (324) is slidably connected to the slide rail three (321) and is rotationally connected to the screw rod three (323).

6. The three-dimensional laser cutting device for tubular workpieces according to claim 5, characterized in that: The Z-axis driving assembly (330) includes a slide rail four (331), an output motor three (332), a screw rod four (333) and a support plate two (334); the slide rail four (331) is laid on the support plate one (324) along the Z-axis direction; the output motor three (332) is installed on the end of the slide rail four (331) away from the support plate one (324); the screw rod four (333) is connected to the output end of the output motor three (332) and is parallel to the laying direction of the slide rail four (331); the support plate two (334) is slidably connected to the slide rail four (331) and is rotationally connected to the screw rod four (333).

7. The three-dimensional laser cutting device for tubular workpieces according to claim 6, characterized in that: The Y-axis driving assembly (340) comprises a slide rail five (341), a push rod (342) and a support plate three (343); the slide rail three (321) is laid on the support plate two (334) along the Z-axis direction; the push rod (342) is installed on the slide rail five (341) and is located on a side thereof away from the workpiece; the support plate three (343) is connected to the output end of the push rod (342) and is slidably connected to the slide rail five (341).

8. The cutting method of the tubular workpiece three-dimensional laser cutting device according to any one of claims 1 to 7, characterized in that: The specific steps are as follows: S1, place the workpiece; Aligning the center of the workpiece with the center of the cross bottom plate (220), and placing the workpiece on the cross bottom plate (220), with the two expansion plates (232) being covered by the workpiece, and the two clamping plates (242) being distributed on both sides of the outside of the workpiece; S2, tighten the workpiece; Turning the hand wheel 1 (234) drives the screw rod 1 (233) and the expansion plate (232) to rotate relative to each other and force the two expansion plates (232) to move away from each other to tighten the workpiece from the inside to the outside; S3, clamping the workpiece; The second hand wheel (244) is rotated to drive the second screw rod (243) and the clamping plate (242) to rotate relative to each other and force the two expansion plates (232) to move closer to each other to clamp the workpiece from the outside to the inside, so that the workpiece is centered; S4, adjusting the position of the welding head (400) on the X-axis; Start the output motor 2 (322), which can drive the screw rod 3 (323) to rotate and drive the support plate 1 (324) and the welding head (400) to slide along the X-axis track until the output head of the welding head (400) is perpendicular to the workpiece. At this time, the output motor 2 (322) stops, and the position of the welding head (400) on the X-axis is locked, and the output direction of the welding head (400) is always perpendicular to the cut surface; S5, adjusting the position of the welding head (400) on the Y axis; By starting the push rod (342), the support plate (343) and the welding head (400) can be driven to move on the Y axis until the distance between the welding head (400) and the workpiece meets the welding conditions; S6, adjusting the position of the welding head (400) on the Z axis and cooperating with the rotating axis for welding; By starting the output motor three (332), the screw rod four (333) can be driven to rotate to drive the welding head (400) to slide on the Z axis. At the same time, the output motor one (260) is started to drive the driven gear (250) and the workpiece to rotate, thereby welding the circumference of the workpiece.

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