A CNC machine tool fixture

Abstract

The present invention discloses a CNC machine tool fixture, comprising: a workbench, a chuck assembly is installed in the workbench, the chuck assembly comprises a shell, an outer locking assembly and an inner locking assembly are rotatably arranged in the shell, and a driving assembly is arranged between the outer locking assembly and the inner locking assembly. The present invention drives the inner locking assembly and the outer locking assembly to move through a driving mechanism, so that the claws on the outer locking assembly and the inner locking assembly are close to each other to clamp the pipe, the claws on the inner locking assembly abut against the inner side of the pipe to perform inner diameter centering and locking, and then the claws on the outer locking assembly clamp the outer side of the steel pipe, thereby enhancing the stability of the pipe when it is clamped, and at the same time, the inner diameter centering method is adopted to improve the precision of pipe processing, so that the wall thickness of the product processed from the pipe is consistent and the quality is higher.

Description

Technical Field

[0001] The invention relates to the technical field of fixtures, and in particular to a fixture for a numerically controlled machine tool. Background Art

[0002] CNC machine tools have better solved the problems of complex, precise, small-batch, and multi-variety parts processing. They are flexible, high-efficiency automated machine tools, represent the development direction of modern machine tool control technology, and are a typical mechatronics product. During the processing of products, CNC machine tools need to use fixtures to clamp and fix the products to facilitate processing.

[0003] During the pipe processing, the pipe is fixed by a chuck. Since the pipe to be processed inevitably has wall thickness errors, that is, the inner and outer diameters of the pipe are different, the chuck uses the outer diameter as the centering standard, resulting in different wall thicknesses in the processed products. This cannot meet the requirements for some high-precision processed products. Summary of the invention

[0004] The purpose of the present invention is to provide a CNC machine tool fixture to solve the above-mentioned deficiencies in the prior art.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a CNC machine tool fixture, comprising: a workbench, a chuck assembly is installed in the workbench, the chuck assembly includes a shell, an outer locking assembly and an inner locking assembly are rotatably arranged in the shell, a driving assembly is arranged between the outer locking assembly and the inner locking assembly, when the pipe needs to be processed, the driving assembly drives the inner locking assembly and the outer locking assembly to respectively press against the inner and outer walls of the pipe to be processed.

[0006] Further, the outer locking assembly includes a first rotating disk, a driving thread is provided on the first rotating disk, a first ratchet tooth is provided on the inner side of the first rotating disk, a plurality of first claws are clamped on the driving thread, and the first claws are slidably arranged on the housing.

[0007] The driving assembly includes a driving disk, a first mounting groove is formed on the driving disk, a first pawl is rotatably arranged in the first mounting groove, a first elastic sheet for supporting the first pawl is fixedly installed in the first mounting groove, and a second ratchet tooth is formed on the inner side of the driving disk.

[0008] The inner locking assembly includes a second rotating disk, a reverse driving thread is provided on the second rotating disk, a plurality of second claws are clamped on the reverse driving thread, the second claws are slidably arranged on the housing, a second mounting groove is provided on the second rotating disk, a second pawl is rotatably arranged in the second mounting groove, and a second spring piece for supporting the second pawl is fixedly installed in the second mounting groove.

[0009] The first pawl abuts against the first ratchet tooth under the support of the first spring sheet, and the second pawl abuts against the second ratchet tooth under the support of the second spring sheet, and the opening directions of the first ratchet tooth and the second ratchet tooth are opposite.

[0010] Furthermore, a slide bar is provided on the workbench, a mobile platform is slidably provided on the slide bar, a movable plate is slidably provided on the mobile platform, and an adjustment component is fixedly connected to a side of the mobile platform close to the chuck component.

[0011] Furthermore, a conical tube is rotatably provided on one side of the movable platform close to the chuck assembly, and the conical tube is located above the movable plate.

[0012] Furthermore, an arc groove is provided on the top of the movable plate, and the movable plate is connected to the moving platform via a first spring.

[0013] Furthermore, the adjustment assembly includes a U-shaped rod, one end of the U-shaped rod is fixedly connected to the mobile platform, the other end of the U-shaped rod is fixedly connected to a second wedge block, a sliding block is slidably sleeved on the outside of the second wedge block, a first wedge block is slidably arranged inside the sliding block, and the second wedge block abuts against the first wedge block.

[0014] Furthermore, the first wedge block is connected to the slider via a second spring, a first permanent magnet is fixedly connected to the first wedge block, and a second permanent magnet is fixedly connected to the second wedge block, and the first permanent magnet and the second permanent magnet attract each other.

[0015] Furthermore, a first bevel gear is fixedly connected to the bottom of the driving disk, a rotating shaft is rotatably arranged in the shell, a second bevel gear is fixedly sleeved on the rotating shaft, the second bevel gear is meshed with the first bevel gear, and a spur gear is fixedly sleeved on the outside of one end of the rotating shaft extending out of the shell, and the first wedge block and the spur gear can mesh and transmit.

[0016] Furthermore, a sealing column is spirally connected to the shell, the end of the sealing column is located on the inner side of the second rotating disk, and the sealing column and the second rotating disk have the same axis.

[0017] Furthermore, a slot is provided on the workbench, and when the pipe is clamped, the slider extends into the slot.

[0018] In the above technical solution, the CNC machine tool fixture provided by the present invention has the beneficial effects of:

[0019] The present invention drives the inner locking component and the outer locking component to move through a driving mechanism, so that the claws on the outer locking component and the inner locking component are close to each other to clamp the pipe, and the claws on the inner locking component abut against the inner side of the pipe to perform inner diameter centering and locking. Subsequently, the claws on the outer locking component clamp the outer side of the steel pipe, thereby enhancing the stability of the pipe when being clamped. At the same time, the inner diameter centering method is used to improve the accuracy of pipe processing, so that the wall thickness of the product processed from the pipe is consistent and the quality is higher.

[0020] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

[0021] This application document provides an overview of various implementations or examples of the technology described in the present disclosure, and is not a comprehensive disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0023] Figure 1 A schematic diagram of the structure of a pipe in a clamping process provided by an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the structure of a pipe provided by an embodiment of the present invention when it is not clamped;

[0025] Figure 3 The embodiment of the present invention provides Figure 2 Enlarged view of point A in the middle;

[0026] Figure 4 A schematic diagram of the internal front structure of a chuck assembly provided in an embodiment of the present invention;

[0027] Figure 5 A schematic diagram of the internal back structure of a chuck assembly provided in an embodiment of the present invention;

[0028] Figure 6 The embodiment of the present invention provides Figure 4 Enlarged view of point B in the middle;

[0029] Figure 7 A schematic diagram of the structure of an adjustment component provided in an embodiment of the present invention;

[0030] Figure 8 A cross-sectional view of an adjustment assembly provided in an embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 1. workbench; 11. slide bar; 12. notch; 2. chuck assembly; 21. housing; 22. first turntable; 221. first ratchet tooth; 222. drive thread; 23. drive disk; 231. second ratchet tooth; 232. first bevel gear; 233. first mounting groove; 234. first pawl; 235. first spring piece; 24. second turntable; 241. second mounting groove; 242. reverse drive thread; 243. second Ratchet; 244, second spring; 25, first claw; 26, second claw; 27, sealing column; 28, second bevel gear; 29, rotating shaft; 291, spur gear; 3, moving platform; 31, tapered tube; 4, movable plate; 41, first spring; 5, adjustment assembly; 51, U-shaped rod; 52, slider; 53, first wedge block; 54, second spring; 55, first permanent magnet; 56, second permanent magnet; 57, second wedge block. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0034] Please refer to 1-8, a CNC machine tool fixture includes: a workbench 1, a chuck assembly 2 is installed in the workbench 1, the chuck assembly 2 is rotatably set on the workbench 1, and can be driven to rotate by a driving mechanism to cooperate with a tool to process the pipe clamped on the chuck assembly 2, the chuck assembly 2 includes a shell 21, an outer locking assembly and an inner locking assembly are rotatably set in the shell 21, a driving assembly is arranged between the outer locking assembly and the inner locking assembly, when the pipe needs to be processed, the driving assembly drives the inner locking assembly and the outer locking assembly to respectively press against the inner and outer walls of the pipe to be processed.

[0035] Specifically, the present invention drives the inner locking assembly and the outer locking assembly to move through a driving mechanism, so that the claws on the outer locking assembly and the inner locking assembly are close to each other to clamp the pipe, and the claws on the inner locking assembly abut against the inner side of the pipe to perform inner diameter centering and locking. Subsequently, the claws on the outer locking assembly clamp the outer side of the steel pipe, thereby enhancing the stability of the pipe when being clamped. At the same time, the inner diameter centering method is used to improve the accuracy of pipe processing, so that the wall thickness of the product processed from the pipe is consistent and the quality is higher.

[0036] Further, the outer locking assembly includes a first rotating disk 22, a driving thread 222 is provided on the first rotating disk 22, a first ratchet tooth 221 is provided on the inner side of the first rotating disk 22, a plurality of first claws 25 are clamped on the driving thread 222, and the first claws 25 are slidably arranged on the housing 21, Figure 3 The first claws 25 slide on the shell 21, and the driving thread 222 is driven to rotate by the rotation of the first turntable 22. Under the limiting effect of the shell 21, the first claws 25 can slide radially on the shell 21, so that the three first claws 25 clamp the outside of the pipe.

[0037] The driving assembly includes a driving disk 23, a first mounting groove 233 is formed on the driving disk 23, a first ratchet 234 is rotatably disposed in the first mounting groove 233, a first elastic piece 235 for supporting the first ratchet 234 is fixedly mounted in the first mounting groove 233, and a second ratchet tooth 231 is formed on the inner side of the driving disk 23.

[0038] The inner locking assembly includes a second rotating disk 24, on which a reverse driving thread 242 is formed, and on which a plurality of second claws 26 are clamped, and the second claws 26 are slidably disposed on the housing 21, as shown in FIG. Figure 3 The second claw 26 is radially slidably arranged on the housing 21, and the reverse driving thread 242 is driven by the rotation of the second rotary disk 24. Under the limiting effect of the housing 21, the second claw 26 can radially slide on the housing 21, so that the three second claws 26 can press the pipe tightly from the inside of the pipe. The second rotary disk 24 is provided with a second mounting groove 241, and a second ratchet 243 is rotatably arranged in the second mounting groove 241. A second spring piece 244 for supporting the second ratchet 243 is fixedly installed in the second mounting groove 241.

[0039] The first pawl 234 abuts against the first ratchet tooth 221 under the support of the first spring sheet 235. Figure 4 Under the elastic force of the first spring piece 235, the first pawl 234 is pressed against the first ratchet tooth 221, and the side of the first pawl 234 that abuts against the first ratchet tooth 221 is treated to increase the friction force, such as installing a friction gasket. The second pawl 243 abuts against the second ratchet tooth 231 under the support of the second spring piece 244. Under the elastic force of the second spring piece 244, the second pawl 243 is pressed against the second ratchet tooth 231. Similarly, the side of the second pawl 243 that abuts against the second ratchet tooth 231 is treated to increase the friction force, and the opening directions of the first ratchet tooth 221 and the second ratchet tooth 231 are opposite.

[0040] Specifically, refer to Figure 3 , Figure 4 as well as Figure 6First, the drive disk 23 is rotated clockwise. Under the elastic force of the first spring piece 235, a large static friction force is generated between the first pawl 234 and the first ratchet tooth 221. Due to the static friction force between the first pawl 234 and the first ratchet tooth 221, the drive disk 23 drives the first rotating disk 22 to rotate clockwise. At the same time, under the elastic force of the second spring piece 244, there is also static friction between the second pawl 243 and the second ratchet tooth 231. The drive disk 23 also drives the second rotating disk 24 to rotate clockwise, so that the driving thread 222 drives the three first claws 25 to the center. The reverse driving thread 242 drives the three second claws 26 to slide outward. When the three second claws 26 are pressed against the inner wall of the pipe, the second claws 26 cannot continue to slide, and the second rotating disk 24 cannot rotate. Since the driving disk 23 continues to rotate, in order to prevent the driving disk 23 and the second rotating disk 24 from continuing to move synchronously, the abutting force brought by the second ratchet teeth 231 to the second pawl 243 is required to overcome the elastic force of the second spring piece 244, so that the second pawl 243 rotates downward a certain distance, so that the driving disk 23 no longer drives the second rotating disk 24 to move together. The claws 25 still do not abut against the outer wall of the pipe, and the driving disk 23 continues to drive the first rotating disk 22 to rotate until the three first claws 25 clamp the pipe. When the abutment force between the first pawl 234 and the first ratchet tooth 221 can overcome the elastic force of the first spring piece 235, the driving disk 23 no longer drives the first rotating disk 22 to rotate, thereby achieving the clamping of the pipe by the three first claws 25 and the three second claws 26. The three first claws 25 and the three second claws 26 correspond to each other one by one, clamping the pipe from both inside and outside, thereby enhancing the stability of the pipe being clamped, and when clamping thin-walled pipes, It can avoid dents in the pipe and improve the quality of the processed products. The initial positions of the first jaw 25 and the second jaw 26 are adjustable and can be adjusted according to actual needs. For example, in order to use inner diameter centering, it is necessary to adjust the initial positions of the first jaw 25 and the second jaw 26 so that the second jaw 26 contacts the pipe before the first jaw 25. Since the thread directions of the driving thread 222 and the reverse driving thread 242 are opposite, when the first turntable 22 and the second turntable 24 rotate in the same direction, the first jaw 25 and the second jaw 26 driven by them slide in opposite directions on the shell 21.

[0041] Furthermore, a slide bar 11 is provided on the workbench 1, and the slide bar 11 is fixedly installed on the workbench 1. A mobile platform 3 is slidably provided on the slide bar 11. The mobile platform 3 can be driven by an external driving mechanism, such as a cylinder, to drive the mobile platform 3 to reciprocate. A movable plate 4 is slidably provided on the mobile platform 3, and the movable plate 4 is used to place pipes. An adjustment component 5 is fixedly connected to one side of the mobile platform 3 close to the chuck assembly 2.

[0042] Specifically, refer to Figure 1When the mobile platform 3 approaches the chuck assembly 2, the pipe placed on the movable plate 4 first contacts the chuck assembly 2, and then the mobile platform 3 continues to slide, the movable plate 4 moves to the right relative to the pipe, and the front end of the adjustment assembly 5 begins to contact the chuck assembly 2, so that the adjustment assembly 5 drives the chuck assembly 2 to self-adaptively clamp the pipe, thereby realizing automatic clamping and unloading of the pipe.

[0043] Furthermore, a conical tube 31 is rotatably provided on one side of the mobile platform 3 close to the chuck assembly 2 , the axis of the conical tube 31 coincides with the axis of the chuck assembly 2 , and the conical tube 31 is located above the movable plate 4 .

[0044] Specifically, refer to Figure 1 and Figure 2 As the pipe contacts the chuck assembly 2, the mobile platform 3 continues to move toward the side of the chuck assembly 2, and the tapered tube 31 is gradually inserted into the pipe. The pipe will move along the outer side of the tapered tube 31, and the pipe will gradually become concentric with the tapered tube 31, reducing the adjustment range of the second clamping jaw 26 when centering the pipe, thereby improving the accuracy of the automatic clamping of the chuck assembly 2 on the pipe.

[0045] Furthermore, an arc groove is opened on the top of the movable plate 4, and the setting of the arc groove facilitates the placement of the pipe. The movable plate 4 is connected to the mobile platform 3 through the first spring 41, one end of the first spring 41 is fixedly connected to the mobile platform 3, and the other end of the first spring 41 is fixedly connected to the movable plate 4.

[0046] Specifically, refer to Figure 1 and Figure 3 When the conical tube 31 adjusts the position of the chuck assembly 2, the tube gradually separates from the arc groove provided on the movable plate 4 until the tube is no longer in contact with the movable plate 4, and the movable plate 4 slides toward the direction of the chuck assembly 2 under the elastic force of the first spring 41.

[0047] Further, the adjustment assembly 5 includes a U-shaped rod 51, and the U-shaped rod 51 can be placed in multiple ways, which can be Figure 7The arrangement shown can also be that the U-shaped opening of the U-shaped rod 51 is arranged upward, the purpose is to prevent the chuck assembly 2 from driving the spur gear 291 to collide with the U-shaped rod 51 during the rotation process. A notch 12 is provided on the workbench 1 to allow the adjustment assembly 5 to extend into. One end of the U-shaped rod 51 is fixedly connected to the mobile platform 3, and the other end of the U-shaped rod 51 is fixedly connected to a second wedge block 57. A slider 52 is slidably sleeved on the outside of the second wedge block 57. An elastic member such as a spring can be provided between the slider 52 and the U-shaped rod 51 to ensure that the slider 52 and the second wedge block 57 will not separate. A first wedge block 53 is slidably provided inside the slider 52, and the second wedge block 57 abuts against the first wedge block 53. The first wedge 53 is connected to the slider through a second spring 54. Block 52, one end of the second spring 54 is fixedly connected to the inner wall of the slider 52, and the other end of the second spring 54 is fixedly connected to the top of the first wedge block 53. The first wedge block 53 is fixedly connected with a first permanent magnet 55, and the second wedge block 57 is fixedly connected with a second permanent magnet 56. The first permanent magnet 55 and the second permanent magnet 56 attract each other. The bottom of the driving disk 23 is fixedly connected with a first bevel gear 232. A rotating shaft 29 is rotatably arranged in the housing 21, and a second bevel gear 28 is fixedly sleeved on the rotating shaft 29. The second bevel gear 28 meshes with the first bevel gear 232. A spur gear 291 is fixedly sleeved on one end of the rotating shaft 29 extending out of the housing 21. The first wedge block 53 and the spur gear 291 can mesh with each other for transmission. Figure 7 The first wedge block 53 is provided with a tooth groove, which meshes with the spur gear 291. The housing 21 is spirally connected with a sealing column 27, and the end of the sealing column 27 is located on the inner side of the second rotary disk 24, and the axis of the sealing column 27 and the second rotary disk 24 are the same. The housing 21 is spirally connected with a sealing column 27, and the end of the sealing column 27 is located on the inner side of the second rotary disk 24, and the axis of the sealing column 27 and the second rotary disk 24 are the same. The sealing column 27 can prevent the debris generated during the processing of the pipe from entering the chuck assembly 2. In order to ensure that the first jaw 25 and the second jaw 26 are not When the chuck assembly 2 is disengaged, the first jaw 25 and the second jaw 26 are both limited in the chuck assembly 2. A limiting member of the first jaw 25 is provided on the shell 21. For example, the first jaw 25 is limited in a slide groove provided on the shell 21 so that the first jaw 25 will not slide out of the shell 21, and the second jaw 26 is blocked by the sealing column 27 and will not slide out of the shell 21. A slot 12 is provided on the workbench 1. When the pipe is clamped, the slider 52 extends into the slot 12 so that the U-shaped rod 51 is located below the chuck assembly 2 to prevent the adjustment assembly 5 from affecting the operation of the chuck assembly 2.

[0048] Specifically, refer to Figures 1 to 8First, place the pipe on the movable plate 4, and as the moving platform 3 is driven to approach the chuck assembly 2, as the pipe contacts the chuck assembly 2, the first spring 41 is gradually compressed, and as the moving platform 3 continues to slide, the tapered tube 31 begins to be inserted into the pipe to adjust the position of the pipe, and then the first wedge block 53 is engaged with the spur gear 291, and the first wedge block 53 drives the spur gear 291 to rotate, so that the second bevel gear 28 drives the driving disk 23 to rotate, thereby realizing the clamping and fixing of the pipe by the chuck assembly 2, and the moving platform 3 continues to slide until the U-shaped rod 51 is located below the spur gear 291 and stops sliding. At this time, the pipe is turned. After the pipe processing is completed, refer to Figure 1 , through the rightward movement of the mobile platform 3, the first wedge block 53 meshes with the spur gear 291, so that the first claw 25 and the second claw 26 in the chuck assembly 2 successively release the pipe, and the processed pipe is sleeved on the tapered tube 31 or falls on the movable plate 4 to complete the pipe processing. How to follow the movement of the mobile platform 3 depends on the length of the pipe. If the pipe is short, the pipe will fall on the movable plate 4. If the pipe is long, it will be sleeved on the tapered tube 31 and brought back. When the first claw 25 or the second claw 26 runs to the maximum stroke of being opened, the spur gear 291 will be locked and no longer rotated, and the first wedge block 53 will also be locked. As the mobile platform 3 moves, the pipe will be locked. Continuing to move right, the first permanent magnet 55 and the second permanent magnet 56 are disengaged, and the second wedge block 57 gradually slides out of the slider 52. The second wedge block 57 no longer abuts against the first wedge block 53. Under the elastic force of the second spring 54, the first wedge block 53 retracts into the slider 52 and no longer meshes with the spur gear 291. Finally, under the adsorption force of the first permanent magnet 55 and the second permanent magnet 56, the slider 52 slides on the second wedge block 57, and the second wedge block 57 continues to abut against the first wedge block 53, so that the first wedge block 53 overcomes the elastic force of the second spring 54 and slides out of the slider 52 for use in the next loading, thereby realizing automatic unloading of the pipe and greatly improving the efficiency of pipe processing.

[0049] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A CNC machine tool fixture, comprising: A workbench (1), characterized in that: a chuck assembly (2) is installed in the workbench (1), the chuck assembly (2) comprises a shell (21), an outer locking assembly and an inner locking assembly are rotatably arranged in the shell (21), a driving assembly is arranged between the outer locking assembly and the inner locking assembly, and when a pipe needs to be processed, the driving assembly drives the inner locking assembly and the outer locking assembly to respectively press against the inner and outer walls of the pipe to be processed, The external locking assembly comprises a first rotating disk (22), a driving thread (222) is provided on the first rotating disk (22), a first ratchet tooth (221) is provided on the inner side of the first rotating disk (22), a plurality of first claws (25) are clamped on the driving thread (222), and the first claws (25) are slidably arranged on the housing (21). The driving assembly comprises a driving disk (23), a first mounting groove (233) being formed on the driving disk (23), a first ratchet pawl (234) being rotatably disposed in the first mounting groove (233), a first elastic piece (235) for supporting the first ratchet pawl (234) being fixedly mounted in the first mounting groove (233), and a second ratchet tooth (231) being formed on the inner side of the driving disk (23). The inner locking assembly comprises a second rotating disk (24), the second rotating disk (24) is provided with a reverse driving thread (242), a plurality of second claws (26) are clamped on the reverse driving thread (242), the second claws (26) are slidably arranged on the housing (21), the second rotating disk (24) is provided with a second mounting groove (241), a second pawl (243) is rotatably arranged in the second mounting groove (241), and a second spring piece (244) for supporting the second pawl (243) is fixedly installed in the second mounting groove (241). The first pawl (234) abuts against the first ratchet tooth (221) under the support of the first spring sheet (235), and the second pawl (243) abuts against the second ratchet tooth (231) under the support of the second spring sheet (244), and the opening directions of the first ratchet tooth (221) and the second ratchet tooth (231) are opposite. The workbench (1) is provided with a slide bar (11), a movable platform (3) is slidably provided on the slide bar (11), a movable plate (4) is slidably provided on the movable platform (3), and an adjustment component (5) is fixedly connected to a side of the movable platform (3) close to the chuck component (2). An arc-shaped groove is formed on the top of the movable plate (4), and the movable plate (4) is connected to the movable platform (3) via a first spring (41). The adjustment assembly (5) comprises a U-shaped rod (51), one end of the U-shaped rod (51) is fixedly connected to the mobile platform (3), the other end of the U-shaped rod (51) is fixedly connected to a second wedge block (57), a sliding block (52) is slidably sleeved outside the second wedge block (57), a first wedge block (53) is slidably arranged inside the sliding block (52), and the second wedge block (57) abuts against the first wedge block (53).

2. A CNC machine tool fixture according to claim 1, characterized in that: A conical tube (31) is rotatably arranged on one side of the movable platform (3) close to the chuck assembly (2), and the conical tube (31) is located above the movable plate (4).

3. A CNC machine tool fixture according to claim 1, characterized in that: The first wedge block (53) is connected to the slider (52) via a second spring (54); a first permanent magnet (55) is fixedly connected to the first wedge block (53); a second permanent magnet (56) is fixedly connected to the second wedge block (57); the first permanent magnet (55) and the second permanent magnet (56) attract each other.

4. A CNC machine tool fixture according to claim 3, characterized in that: A first bevel gear (232) is fixedly connected to the bottom of the driving disk (23); a rotating shaft (29) is rotatably arranged in the housing (21); a second bevel gear (28) is fixedly sleeved on the rotating shaft (29); the second bevel gear (28) is meshed with the first bevel gear (232); a spur gear (291) is fixedly sleeved on the outside of one end of the rotating shaft (29) extending out of the housing (21); and the first wedge block (53) and the spur gear (291) are capable of meshing and transmitting.

5. The CNC machine tool fixture according to claim 1, characterized in that: A sealing column (27) is spirally connected to the housing (21), the end of the sealing column (27) is located on the inner side of the second rotating disk (24), and the axis of the sealing column (27) and the second rotating disk (24) are the same.

6. A CNC machine tool fixture according to claim 1, characterized in that: The workbench (1) is provided with a slot (12), and when the pipe is clamped, the slider (52) extends into the slot (12).

Images