A chuck centering clamping device for a laser pipe cutting machine

Abstract

The present application belongs to the technical field of hot cutting, and in particular to a chuck centering and clamping device for a laser pipe cutting machine, comprising a housing, a driving assembly, a clamping assembly and a lifting mechanism; the driving assembly and the clamping assembly are respectively arranged inside and above the housing, and the bracket is connected with the limiting ring through the connecting rod; wherein the bracket and the clamping assembly are arranged in a staggered manner, and when the bracket moves along the axial direction of the connecting rod, the bracket and the clamping assembly do not interfere with each other. When different sections of the pipe are processed, and the outer wall of a certain section has completed precision machining or is plated with a special plating layer, the device can switch from clamping the outer wall to the inner wall. With the help of a special supporting and positioning structure, the pipe can be stably fixed without holding the pipe body, and the use of inner wall space fixation can avoid damage such as indentation and plating layer falling off of the processed outer wall section caused by clamping force, thereby ensuring the overall quality of the pipe.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of hot cutting, and particularly relates to a chuck centering and clamping device for a laser pipe cutting machine. BACKGROUND

[0002] In the field of laser pipe cutting processing, stable clamping and accurate centering of the pipe are the key prerequisites for ensuring cutting accuracy. At present, when a laser pipe cutting machine is cutting a pipe, it often needs to switch the clamping position of the pipe according to the processing requirements, that is, to switch from clamping a certain part of the pipe to another part, which is specifically switching from clamping the outer wall of the pipe to clamping the inner wall, or switching from clamping the inner wall to clamping the outer wall. Specifically, the processing requirements for clamping position switching of the same pipe mainly manifest in the following scenarios:

[0003] When different sections of the pipe are processed, if the outer wall of a certain section has been precisely processed or plated with a special plating layer, and subsequent processing needs to be performed on other sections of the pipe, continuing to clamp the processed outer wall section will easily cause damage such as indentation or plating layer peeling due to clamping force, affecting the overall quality of the pipe. At this time, it is necessary to switch to clamping the inner wall of the pipe to fix the pipe using the inner wall space and avoid damaging the processed outer wall section.

[0004] When a complex multi-process cutting is performed on the same pipe, for example, a hole is first made in the middle of the pipe, and then the end of the pipe is cut into a special shape, when the middle hole is made, clamping the outer wall of the pipe may be more convenient, but when the end is cut into a special shape, if the outer wall is still clamped, the clamping assembly may block the cutting path of the laser, causing the laser to not accurately reach the processing position of the end. At this time, it is necessary to switch the clamping position to clamp the inner wall of the pipe to avoid the cutting area of the end and provide sufficient operation space for laser cutting.

[0005] However, the existing chuck clamping device of the laser pipe cutting machine has obvious technical defects when performing the above-mentioned clamping position switching operation on the same pipe: due to the lack of a special pipe supporting and positioning structure, the operator needs to hold the pipe to adjust its position to cooperate with the switching action of the clamping assembly. This manual operation increases the labor intensity and is not convenient for single-person operation.

[0006] In view of the above-mentioned deficiencies in the prior art, it is urgent to develop a chuck centering and clamping device for a laser pipe cutting machine, which can stably support the same pipe, avoid interference with the clamping assembly, and facilitate quick switching of the clamping position, so as to improve the accuracy, efficiency and automation degree of laser pipe cutting processing. SUMMARY

[0007] To solve the problems raised in the background art, the present application provides a chuck centering and clamping device for a laser pipe cutting machine.

[0008] To achieve the above object, the present application provides the following technical scheme: a chuck centering and clamping device for a laser pipe cutting machine, comprising a housing, a driving assembly, a clamping assembly and a lifting mechanism; the driving assembly and the clamping assembly are respectively arranged inside and above the housing, and the driving assembly is used to drive the clamping assembly to clamp a pipe;

[0009] The lifting mechanism comprises a bracket, a connecting rod and a limiting ring;

[0010] The bracket is connected with the limiting ring through the connecting rod;

[0011] The bracket and the clamping assembly are arranged in a staggered manner, and when the bracket moves along the axial direction of the connecting rod, the bracket and the clamping assembly do not interfere with each other.

[0012] Preferably, the lifting device is further provided, and the output end of the lifting device is connected with the limiting ring.

[0013] Preferably, the lifting mechanism further comprises a sliding rail, a protrusion and a bolt;

[0014] The sliding rail is connected with the housing, the sliding rail is connected with the protrusion, the protrusion is connected on the limiting ring, the protrusion is threadedly connected with the bolt, and the sliding rail is slidingly connected with the limiting ring;

[0015] A threaded hole matched with the bolt is arranged on the housing, and when the bracket is at the highest point, the bolt can pass through the protrusion and be fixed in the threaded hole on the housing.

[0016] Preferably, the clamping assembly comprises a clamping head, a first clamping part, a second clamping part and a seat body;

[0017] The seat body is slidingly connected with the housing, the clamping head is arranged on the seat body, and the first clamping part and the second clamping part are arranged at both ends of the clamping head in the running direction;

[0018] The first clamping part and the second clamping part are respectively used to fix the outer wall and the inner wall of the pipe.

[0019] Preferably, the first clamping part and the second clamping part are detachably connected with the clamping head.

[0020] Preferably, the clamping assembly further comprises a clamping strip and a clamping groove;

[0021] The clamping strip is integrally formed on the clamping head, the clamping groove is processed on the seat body, and the clamping strip can be clamped on the clamping groove;

[0022] The position of the clamping groove is perpendicular to the advancing direction of the seat body.

[0023] Preferably, the driving assembly comprises an electric push rod, a top plate, a limiting rod, a first driving member, a second driving member and a groove body.

[0024] The output end of the electric push rod is connected with the top plate, the top plate is in sliding connection with the limiting rod, the limiting rod is connected with the shell, the top plate is in rotary connection with the first driving member, the first driving member is in rotary connection with the second driving member, the groove body is processed below the seat body, one end of the second driving member is arranged inside the groove body, and the middle part of the second driving member is in rotary connection with the shell.

[0025] When the electric push rod drives the top plate to move, the electric push rod indirectly drives the second driving member to move inside the groove body and indirectly drives the seat body to slide.

[0026] Preferably, at least two positioning assemblies arranged on the bracket are further arranged; the positioning assembly comprises a bottom plate, a first rotary part, a second rotary part, a connecting rod, an elastic assembly, a fixing head, a shaft body and a torsional spring.

[0027] The bottom plate is detachably connected with the bracket, the bottom plate is connected with the shaft body, the shaft body is in rotary connection with the first rotary part, the torsional spring is sleeved on the shaft body, the two ends of the torsional spring are connected with the shaft body and the first rotary part respectively, the first rotary part is in rotary connection with the second rotary part, the second rotary part is in rotary connection with the connecting rod, the connecting rod is in sliding connection with the bottom plate, the elastic assembly is arranged between the connecting rod and the fixing head, and the outer wall of the fixing head is in sliding connection with the inner wall of the connecting rod.

[0028] When the torsional spring does not have elastic deformation, that is, the first rotary part and the second rotary part are parallel, at this time, the fixing head has the maximum movement stroke.

[0029] Preferably, the elastic assembly comprises a spring; the spring is sleeved on the fixing head, and the two ends of the spring are connected with the connecting rod and the annular protrusion on the fixing head respectively.

[0030] At least two fixing heads are used to abut against the inner wall of the pipe to be fixed.

[0031] Preferably, the positioning assembly further comprises a contact part, a contact rod and a circular wheel.

[0032] The contact part is horizontally arranged above the first rotary part, the contact rod is connected with the top of the shell, and the circular wheel is in rotary connection with the contact rod.

[0033] When the bracket is attached to the shell, the round wheel and the contact rod can pass through the bottom plate and drive the contact part to move away from the shell, and at this time the fixed head moves towards the bottom plate.

[0034] Compared with the prior art, the device can switch from clamping the outer wall to the inner wall when different sections of the pipe are processed, and the outer wall of a certain section has been precisely processed or plated with a special plating layer. With the help of a special supporting and positioning structure, the pipe can be stably fixed without holding the pipe body, and the use of inner wall space fixation can avoid damage such as indentation and plating layer falling off caused by clamping force on the processed outer wall section, thereby ensuring the overall quality of the pipe.

[0035] The bracket and the clamping assembly are arranged in a staggered manner in the device, and when the bracket moves axially along the connecting rod, they do not interfere with each other. This makes it unnecessary to disassemble the support structure when adjusting the support height or switching the clamping position, reducing the operation steps, saving time, and effectively improving the processing efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0036] The accompanying drawings are included to provide a further understanding of the application and constitute a part of the specification, together with the embodiments of the application, to explain the application, and do not constitute a limitation on the application. In the drawings:

[0037] Figure 1 It is a schematic diagram of the overall structure of the application;

[0038] Figure 2 It is an exploded view of the application;

[0039] Figure 3 It is a schematic diagram of the connection structure of the shell and the power part in the application;

[0040] Figure 4 It is a schematic diagram of the connection structure of the lifting mechanism in the application;

[0041] Figure 5 It is a schematic diagram of the connection structure of the bolt and the connecting rod in the application;

[0042] Figure 6 It is a schematic diagram of the connection structure of the driving assembly and the clamping assembly in the application;

[0043] Figure 7 It is a partial enlarged view of the driving assembly in the application;

[0044] Figure 8 It is a schematic diagram of the connection structure of the second driving member and the groove in the application;

[0045] Figure 9 It is a schematic diagram of the connection structure of the positioning assembly in the application.

[0046] Explanation of reference signs:

[0047] 1, housing; 2, power unit; 3, lifting mechanism; 301, limiting ring; 302, sliding rail; 303, protrusion; 304, bolt; 305, connecting rod; 306, bracket; 4, positioning assembly; 401, bottom plate; 402, contact rod; 403, round wheel; 404, first rotating part; 405, contact part; 406, second rotating part; 407, fixed head; 408, connecting rod; 409, spring; 411, shaft body; 410, torsional spring; 5, driving assembly; 501, electric push rod; 502, top plate; 503, limiting rod; 504, first driving part; 505, second driving part; 506, groove body; 6, clamping assembly; 601, clamping head; 602, first clamping part; 603, second clamping part; 604, seat body; 605, clamping groove; 606, clamping strip. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0049] As Figures 1 to 5As shown: a kind of centering clamping device for laser pipe cutting machine chuck, the centering clamping device mainly includes shell 1, power part 2, drive assembly 5, clamping assembly 6 and lifting mechanism 3.Power part 2 is used to drive shell 1 rotation in turn and adjust the position of pipe material, and power part 2 can be servo motor with speed reducer transmission. Among them, drive assembly 5 is arranged in the inside of shell 1, clamping assembly 6 is located above shell 1, and the action of drive assembly 5 is to drive clamping assembly 6 to carry out clamping operation to pipe material.Lifting mechanism 3 is mainly composed of bracket 306, connecting rod 305 and limit ring 301.Bracket 306 is connected with limit ring 301 by connecting rod 305, and bracket 306 is arranged in staggered position with clamping assembly 6, and such design ensures that when bracket 306 moves along the axial direction of connecting rod 305, bracket 306 will not interfere with clamping assembly 6.Lifting mechanism 3 is also provided with slide rail 302, lug 303 and bolt 304.Slide rail 302 is fixedly connected with shell 1, lug 303 is slidably connected with slide rail 302, and lug 303 is connected on limit ring 301.Threaded hole is provided on lug 303, and bolt 304 is threadedly connected with threaded hole.Threaded hole matched with bolt 304 is provided on shell 1, when bracket 306 is lifted to the highest point under the action of lifting device, bolt 304 can pass through the threaded hole on lug 303 and is screwed into the threaded hole on shell 1, so as to fix the position of bracket 306, prevent it from being displaced due to the gravity of pipe material and other factors during work, and ensure the stability of the device when clamping pipe material and other operations.

[0050] In another embodiment, the above-mentioned manual fixing mode is replaced by lifting device (the specific form is not shown in the figure, and common lifting power sources such as air cylinder and hydraulic cylinder can be used), the output end of lifting device is connected with limit ring 301, and through the telescopic action of lifting device, limit ring 301 can be driven to move along a certain direction, and then bracket 306 is driven to rise or fall through connecting rod 305.

[0051] As shown: Figures 6 to 8 The specific structure of clamping assembly 6 and drive assembly 5 of the device is as follows:

[0052] Clamping assembly 6 includes clamping head 601, first clamping part 602, second clamping part 603, seat body 604, clamping strip 606 and clamping groove 605.

[0053] The seat body 604 is in sliding connection with the shell 1, and specifically, an adaptive sliding channel structure can be arranged on the shell 1 to enable the seat body 604 to stably slide along a preset track. The clamping head 601 is arranged on the seat body 604 and is connected by cooperation of a clamping strip 606 and a clamping groove 605, wherein the clamping strip 606 is integrally formed on the clamping head 601, the clamping groove 605 is processed on the seat body 604, and the clamping groove 605 is arranged perpendicularly to the advancing direction of the seat body 604. Such a design can ensure stable connection of the clamping head 601 and the seat body 604 and facilitate quick disassembly and replacement of the clamping head 601. After the clamping head 601 and the seat body 604 are positioned at different positions by the clamping strip 606 and the clamping groove 605, fasteners such as bolts can be used for positioning.

[0054] The first clamping part 602 and the second clamping part 603 are respectively arranged at two ends of the advancing direction of the clamping head 601, and both are in detachable connection with the clamping head 601, for example, screw connection or buckle connection, so as to facilitate replacement of clamping parts of different sizes according to the specifications and models of the pipe. The first clamping part 602 is used for fixing the outer wall of the pipe, and the second clamping part 603 is used for fixing the inner wall of the pipe. Through cooperation of the two, the pipe can be stably clamped from the inner and outer sides, and the centering accuracy and clamping stability are improved.

[0055] The driving assembly 5 comprises an electric push rod 501, a top plate 502, a limiting rod 503, a first driving piece 504, a second driving piece 505 and a groove body 506.

[0056] The electric push rod 501 is fixedly installed in the interior of the shell 1, and its output end is fixedly connected with the top plate 502, for providing power for the entire driving assembly. The limiting rod 503 is fixedly connected with the shell 1, and a through hole adapted to the limiting rod 503 is arranged on the top plate 502, so that the top plate 502 can stably slide along the axial direction of the limiting rod 503, thereby ensuring linear movement and stability of the top plate 502.

[0057] The top plate 502 is rotationally connected with one end of the first driving piece 504 through a rotating shaft, and the other end of the first driving piece 504 is also rotationally connected with one end of the second driving piece 505 through a rotating shaft. The middle part of the second driving piece 505 is rotationally connected with the shell 1 through a fixed shaft, so that the second driving piece 505 can rotate about the fixed shaft. The groove body 506 is processed below the seat body 604, and one end of the second driving piece 505, which is away from the first driving piece 504, is arranged in the interior of the groove body 506 and is in sliding cooperation with the inner wall of the groove body 506.

[0058] When the electric push rod 501 is started and drives the top plate 502 to move axially along the limiting rod 503, the top plate 502 drives the first driving part 504 to move, and the first driving part 504 in turn drives the second driving part 505 to rotate around the fixed shaft at the middle part of the second driving part 505. At this time, one end of the second driving part 505 in the groove body 506 slides in the groove body 506, and drives the seat body 604 to slide along the slide on the shell 1 through the groove body 506, so as to finally realize the clamping or loosening action of the clamping assembly 6.

[0059] As shown in the figure, the device further comprises at least two positioning assemblies 4 arranged on the bracket 306, which can further improve the positioning stability of the pipe during the machining process. The specific structure and working principle are as follows: Figure 9

[0060] The positioning assembly 4 comprises a bottom plate 401, a first rotating part 404, a second rotating part 406, a connecting rod 408, an elastic assembly, a fixed head 407, a shaft body 411, a torsional spring 410, a contact part 405, a contact rod 402 and a circular wheel 403.

[0061] The bottom plate 401 is detachably connected to the bracket 306, and can be connected by bolts, buckles or other common detachable structures, so as to facilitate the disassembly, assembly and maintenance of the positioning assembly 4. The bottom plate 401 is fixedly connected with the shaft body 411, and the shaft body 411 is arranged in a direction perpendicular to the bottom plate 401. The shaft body 411 is rotatably connected with the first rotating part 404, so that the first rotating part 404 can rotate freely around the axis of the shaft body 411. The torsional spring 410 is sleeved on the shaft body 411, one end of the torsional spring 410 is fixedly connected with the shaft body 411, and the other end is fixedly connected with the first rotating part 404. Under the elastic force of the torsional spring 410, the first rotating part 404 can be provided with a reset power.

[0062] One end of the first rotating part 404 away from the shaft body 411 is rotatably connected with one end of the second rotating part 406 through a pin shaft, the other end of the second rotating part 406 is rotatably connected with one end of the connecting rod 408 through a pin shaft, and the end of the connecting rod 408 away from the second rotating part 406 is slidably connected with the bottom plate 401. Specifically, a sliding groove matched with the connecting rod 408 can be arranged on the bottom plate 401 to ensure that the connecting rod 408 can stably slide along the extension direction of the sliding groove.

[0063] ​The elastic assembly is arranged between the connecting rod 408 and the fixing head 407, and the elastic assembly comprises a spring 409, the spring 409 is sleeved on the fixing head 407, the outer wall of the fixing head 407 is in sliding connection with the inner wall of the connecting rod 408, the annular protrusion is arranged on the fixing head 407, one end of the spring 409 is in abutment with the end of the connecting rod 408, and the other end is in abutment with the annular protrusion on the fixing head 407. At least two fixing heads 407 are used to abut against the inner wall of the pipe to be fixed, and through the elastic force of the spring 409, the fixing head 407 can always be in close contact with the inner wall of the pipe, so that the positioning requirement of the pipe with different diameters can be met.

[0064] When the torsional spring 410 does not have elastic deformation, that is, the first rotating part 404 and the second rotating part 406 are in a parallel state, at this time, under the linkage of various components, the fixing head 407 is in the maximum movement stroke position, and sufficient space can be provided for the pipe to be put in.

[0065] The contact part 405 is horizontally arranged above the first rotating part 404, the contact part 405 is fixedly connected with the first rotating part 404 and moves synchronously with the first rotating part 404. The contact rod 402 is fixedly connected to the top of the shell 1, the contact rod 402 extends in a direction perpendicular to the top surface of the shell 1, and the circular wheel 403 is rotationally connected to the contact rod 402 through a wheel shaft, and the circular wheel 403 can freely rotate around the wheel shaft.

[0066] When the bracket 306 moves downward along the axial direction of the connecting rod 305 and is attached to the shell 1, the circular wheel 403 and the contact rod 402 can pass through the through hole prearranged on the bottom plate 401, the circular wheel 403 is in contact with the contact part 405 and drives the contact part 405 to move away from the shell 1, at this time, the first rotating part 404 rotates around the shaft body 411 and causes the torsional spring 410 to have elastic deformation, the first rotating part 404 drives the second rotating part 406 to move, the second rotating part 406 pulls the connecting rod 408 to slide along the sliding groove on the bottom plate 401 towards the shaft body 411, and then drives the fixing head 407 to move towards the bottom plate 401, so as to realize the contraction action of the fixing head 407; when the bracket 306 moves upward and away from the shell 1, under the elastic force of the torsional spring 410, the first rotating part 404 is reset, and the linkage of various components drives the fixing head 407 to extend outward, and the fixing head 407 is reset to abut against the inner wall of the pipe. When the bracket 306 is reset, the pipe is not contacted, after the bracket 306 is lifted, the pipe is fixed, the pipe is prevented from falling off from the bracket 306 when the clamping assembly 6 below switches the clamping position, the safety is greatly improved, and the linkage mode of the circular wheel 403 and the contact rod 402 is adopted, so that the steps of manual operation and the number of electric equipment are reduced, and the production cost of the device is saved. The positioning assembly 4 can be detachably connected to the bracket 306 according to the corresponding size of the pipe, so as to realize the adjustment of the clamping position.

[0067] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that the technical solutions described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalent ones. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A centering and clamping device for a laser tube cutting machine chuck, characterized by: The utility model provides a pipe lifting device, including shell (1), drive assembly (5), clamping assembly (6) and lifting mechanism (3), drive assembly (5) and clamping assembly (6) are arranged inside and above shell (1) respectively, drive assembly (5) is used for driving clamping assembly (6) pipe clamping, The lifting mechanism (3) comprises a bracket (306), a connecting rod (305) and a limiting ring (301); The bracket (306) is connected with the limiting ring (301) through the connecting rod (305); Wherein, the bracket (306) and the clamping assembly (6) are misaligned, when the bracket (306) moves along the axial direction of the connecting rod (305), the bracket (306) and the clamping assembly (6) do not interfere with each other; Further comprising a lifting device, the output end of the lifting device is connected with the limiting ring (301); The lifting mechanism (3) further comprises a sliding rail (302), a protruding block (303) and a bolt (304); The sliding rail (302) is connected with the shell (1), the sliding rail (302) is connected with the protruding block (303), the protruding block (303) is connected on the limiting ring (301), the protruding block (303) is screwed with the bolt (304), and the sliding rail (302) is slidably connected with the limiting ring (301); A threaded hole matched with the bolt (304) is arranged on the shell (1), when the bracket (306) is at the highest point, the bolt (304) can pass through the protruding block (303) and be fixed in the threaded hole on the shell (1); The clamping assembly (6) comprises a clamping head (601), a first clamping part (602), a second clamping part (603) and a seat body (604); The seat body (604) is slidably connected with the shell (1), the clamping head (601) is arranged on the seat body (604), and the first clamping part (602) and the second clamping part (603) are arranged at two ends of the clamping head (601) in the running direction; Wherein, the first clamping part (602) and the second clamping part (603) are respectively used for fixing the outer wall and the inner wall of the pipe; Further comprising at least two positioning assemblies (4) arranged on the bracket (306); the positioning assembly (4) comprises a bottom plate (401), a first rotating part (404), a second rotating part (406), a connecting rod (408), an elastic assembly, a fixed head (407), a shaft body (411) and a torsional spring (410); The bottom plate (401) is detachably connected to the bracket (306), the bottom plate (401) is connected with the shaft body (411), the shaft body (411) is rotationally connected with the first rotating part (404), the torsional spring (410) is sleeved on the shaft body (411), the two ends of the torsional spring (410) are connected with the shaft body (411) and the first rotating part (404) respectively, the first rotating part (404) is rotationally connected with the second rotating part (406), the second rotating part (406) is rotationally connected with the connecting rod (408), the connecting rod (408) is slidingly connected with the bottom plate (401), the elastic assembly is arranged between the connecting rod (408) and the fixed head (407), and the outer wall of the fixed head (407) is slidingly connected with the inner wall of the connecting rod (408); When the torsional spring (410) does not elastically deform, that is, the first rotating part (404) and the second rotating part (406) are parallel, at this time, the fixed head (407) is the maximum movement stroke; The positioning assembly (4) further comprises a contact part (405), a contact rod (402) and a circular wheel (403); The contact part (405) is horizontally arranged above the first rotating part (404), the contact rod (402) is connected to the top of the shell (1), and the circular wheel (403) is rotationally connected with the contact rod (402); When the bracket (306) is attached to the shell (1), the circular wheel (403) and the contact rod (402) can pass through the bottom plate (401) and drive the contact part (405) to move away from the shell (1), at this time, the fixed head (407) moves towards the bottom plate (401).

2. The centering and clamping device for a laser tube cutting machine chuck of claim 1, characterized in that: The first clamping part (602) and the second clamping part (603) are detachably connected with the clamping head (601).

3. The centering and clamping device for a laser tube cutting machine chuck of claim 2, characterized in that: The clamping assembly (6) further comprises a clamping strip (606) and a clamping groove (605); The clamping strip (606) is integrally formed on the clamping head (601), the clamping groove (605) is processed on the seat body (604), and the clamping strip (606) can be clamped on the clamping groove (605). The clamping groove (605) is arranged vertically to the advancing direction of the seat body (604).

4. The centering and clamping device for a laser tube cutting machine chuck of claim 1, wherein: The driving assembly (5) comprises an electric push rod (501), a top plate (502), a limiting rod (503), a first driving piece (504), a second driving piece (505) and a groove body (506). The output end of the electric push rod (501) is connected with the top plate (502), the top plate (502) is slidably connected with the limiting rod (503), the limiting rod (503) is connected with the shell (1), the top plate (502) is rotatably connected with the first driving piece (504), the first driving piece (504) is rotatably connected with the second driving piece (505), the groove (506) is formed in the lower portion of the seat body (604), one end of the second driving piece (505) is arranged in the groove (506), and the middle portion of the second driving piece (505) is rotatably connected with the shell (1). When the electric push rod (501) drives the top plate (502) to move, the electric push rod (501) indirectly drives the second driving piece (505) to move in the groove (506) and indirectly drives the seat body (604) to slide.

5. The centering and clamping device for a laser tube cutting machine chuck of claim 1, wherein: The elastic assembly comprises a spring (409); the spring (409) is sleeved on the fixed head (407), and the two ends of the spring (409) are connected with the connecting rod (408) and the annular protrusion on the fixed head (407) respectively. At least two fixed heads (407) are arranged to abut against the inner wall of the pipe and fix the pipe.

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