An adaptive and adjustable self-locking fixing device for CNC machine tools

Abstract

The present invention discloses an adaptable and adjustable self-locking fixing device for a numerically controlled machine tool, comprising a pipe fitting, an adaptable and adjustable device, a supporting processing platform, a supporting mounting platform, a control connecting arm, a hydraulic cylinder and a self-locking mechanism, wherein the middle part of the self-locking mechanism is fixedly connected to the upper end of the supporting processing platform, the bottom of the adaptable and adjustable device is fixedly connected to the upper end of the self-locking mechanism, the pipe fitting is clamped and fixed to the middle part of the adaptable and adjustable device and the self-locking mechanism, and the supporting mounting platform is evenly and fixedly distributed in a circular shape at the bottom end of the self-locking mechanism. During the use of the present invention, pipe fittings of different diameters can be automatically adapted and adjusted to complete self-locking fixation, so that pipe fittings of different diameters can complete self-locking fixation before processing conveniently and quickly.

Description

Technical Field

[0001] The invention relates to the technical field of self-locking and fixing of machine tool processing, in particular to an adaptive and adjustable self-locking and fixing device for a numerically controlled machine tool. Background Art

[0002] During the high-precision processing of pipe fittings using machine tools, it is necessary to fix and limit the bottom of the pipe fittings so that the pipe fittings will not shake or shift during the processing. However, the fixing devices currently used in the CNC machine tool processing process need to be adjusted accordingly according to the different diameters of the pipe fittings when limiting and fixing the pipe fittings of different diameters, so that the self-locking fixing device cannot automatically and autonomously adjust according to the different pipe diameters and control the clamping and fixing strength during use. Therefore, a device is urgently needed to solve the above problem so that pipe fittings of different diameters can automatically adapt and adjust the clamping performance and strength during the clamping and fixing process. Summary of the invention

[0003] The object of the present invention is to provide an adaptive and adjustable self-locking fixing device for a numerically controlled machine tool to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an adaptive and adjustable self-locking fixing device for a CNC machine tool, comprising a pipe fitting, an adaptive and regulating device, a supporting processing table, a supporting mounting table, a control connecting arm, a hydraulic cylinder and a self-locking mechanism, wherein the middle part of the self-locking mechanism is fixedly connected to the upper end of the supporting processing table, the bottom of the adaptive and regulating device is fixedly connected to the upper end of the self-locking mechanism, the pipe fitting is clamped and fixed to the middle part of the adaptive and regulating device and the self-locking mechanism, the supporting mounting table is evenly and fixedly distributed in a circular shape at the bottom end of the self-locking mechanism, the hydraulic cylinder is fixedly installed at the upper end of the outer end of the supporting mounting table, and the control connecting arm is fixedly connected to the front end of the hydraulic cylinder, the adaptive and regulating device comprises a movable adjusting splint, an extrusion adjusting wheel, an extrusion adjusting plate, an extrusion limiting groove, a reset spring, an installation fixing plate, an adjusting control rope, a limiting plate, a sliding adjusting block, a supporting fixing frame and a blocking wheel, the supporting fixing frame is provided with six evenly distributed in a circular shape, the limiting plate The cam is fixedly mounted on the top of the support frame, and the cam is fixedly mounted on the top of the support frame, and the cam is slidably connected to the inner side of the cam body. The cam body is fixedly mounted on the top of the support frame, and the cam body is slidably connected to the inner side of the cam body.

[0005] As an optimization, the self-locking mechanism includes a limit support frame and a self-locking adjustment part. There are six self-locking adjustment parts. The six self-locking adjustment parts are circular and evenly distributed on the outside of the limit support frame. The upper end of the limit support frame is evenly provided with sliding slots.

[0006] As an optimization, the self-locking adjustment part includes a direction-changing blocking wheel, a support bracket, an L-shaped fixing frame, a sliding adjustment card block, a pulling reset spring, an extrusion fixing card plate, a sliding extrusion plate, an adjustment card slot, an installation adjustment plate, a pulling control column, a control arm and an adjustment arm. The L-shaped fixing frame is evenly fixedly connected to the bottom of the limit support frame, the sliding adjustment card block is slidably connected to the L-shaped fixing frame, the pulling reset spring is fixedly installed between the bottom end of the sliding adjustment card block and the bottom of the L-shaped fixing frame, the support bracket is fixedly installed on the upper end of the L-shaped fixing frame, and the direction-changing blocking wheel is rotatably installed on the upper part of the support bracket. The sliding extrusion plate is slidably clamped in the sliding slot, the extrusion fixing plate is fixedly connected to the front end of the sliding extrusion plate by bolts, the front end of the adjusting arm is rotatably connected to the middle part of the sliding extrusion plate through a rotating shaft, the end of the adjusting arm is rotatably connected to the upper end of the control arm through a rotating shaft, the adjusting slot is opened in the control arm, the pulling control column is fixedly connected to the bottom end of the control arm, the installing adjustment plate is symmetrically fixedly installed in the middle part of the outer end of the sliding adjustment block, the blocking column is rotatably installed between the outer end heads of the installing adjustment plate, and the blocking column is slidably clamped in the inside of the adjusting slot.

[0007] As an optimization, the outer end of the pulling control column is fixedly connected to a stabilizing swing arm, the upper end of the stabilizing swing arm is connected to a fixed connecting plate, and the upper end of the stabilizing swing arm is rotatably clamped inside the fixed connecting plate, and the fixed connecting plate is fixedly connected to the L-shaped fixing frame.

[0008] As an optimization, the adjustment control rope is fixedly connected to the upper end of the sliding adjustment block through the blocking end of the direction-changing blocking wheel.

[0009] As an optimization, one end of the control connecting arm away from the hydraulic cylinder is rotatably connected to the pulling control column, and the supporting mounting platform is fixedly connected to the bottom end of the L-shaped fixing frame.

[0010] As an optimization, the front end surface of the extrusion fixing clamping plate is arranged in a concave arc shape.

[0011] As an optimization, the bottom end of the limit support frame is fixedly connected to the upper end surface of the support processing table, the bottom end of the support fixing frame is fixedly connected to the upper end of the limit support frame, the upper end surface of the extrusion adjustment plate is in extrusion contact with the outer wall of the pipe fitting, and the front end surface of the extrusion fixing clamp is in extrusion contact with the outer wall of the pipe fitting.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] First, the present invention sets an adapting and regulating device. When pipes of different diameters are inserted into the middle of the adapting and regulating device, the squeezing and regulating plate and the squeezing and regulating wheel in the adapting and regulating device can synchronously squeeze outwards to push each movable regulating clamp and the sliding regulating block to synchronously slide outwards along the limit plate by a specified distance. The distances by which the sliding regulating block slides outwards along the limit plate are different for pipes of different diameters. Therefore, during the sliding process, the control rope can be adjusted to control each self-locking regulating part in the self-locking mechanism to adapt and squeeze and fix the bottom of the pipe. Therefore, the adapting and regulating device plays a role of detection, so that when pipes of different diameters are inserted into the middle of the adapting and regulating device, the adapting and regulating device can automatically control and adjust the clamping and locking strength of each self-locking regulating part after detection. Moreover, the squeezing and regulating plate in the adapting and regulating device also plays a role of limiting and fixing the pipe.

[0014] Second, the present invention sets a self-locking adjustment part, and pulls the sliding adjustment block by adjusting the control rope so that the sliding adjustment block slides upward along the L-shaped fixing frame. When different pipes are inserted into the middle of the adapting and regulating device and the limit support frame, the adjustment control rope pulls the sliding adjustment block to rise to different positions. Therefore, when the hydraulic cylinder pulls the control arm by controlling the connecting arm and the pulling control column to rotate with the position of the blocking column as the axis, the rotation amplitude of the control arm changes. At this time, the adjustment arm is controlled by the control arm so that the sliding extrusion plate slides forward along the sliding card slot at different distances, so that when a pipe with a smaller diameter is inserted When it reaches the middle of the adapting and regulating device and the limit support frame, the sliding extrusion plate slides forward a long distance along the sliding slot, so that the extrusion fixing plate can fully contact and squeeze and lock the outer wall of the pipe fitting. Similarly, when the diameter of the pipe fitting is larger, the distance that the sliding extrusion plate slides forward along the sliding slot is shortened, so that the extrusion fixing plate can be squeezed, contacted and locked with the outer wall of the pipe fitting with a larger diameter with appropriate strength. Therefore, during the use of this device, it has the function of adaptive automatic adjustment according to the different diameters of the pipe fittings, so that pipe fittings of different diameters can be adaptively locked and fixed after being inserted into the interior of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0016] Figure 2 It is a schematic diagram of the bottom structure of the adaptation and regulation device of the present invention;

[0017] Figure 3 It is a schematic diagram of the structure of the adaptation and control device of the present invention;

[0018] Figure 4 It is a schematic diagram of the structure of the self-locking mechanism of the present invention;

[0019] Figure 5It is a structural schematic diagram of the self-locking adjustment part of the present invention;

[0020] Figure 6 It is a schematic diagram of the internal structure of the self-locking adjustment part of the present invention.

[0021] In the figure: 1-pipe fitting, 2-adaptation and control device, 3-support processing table, 4-support installation table, 5-control connecting arm, 6-hydraulic cylinder, 7-self-locking mechanism, 8-movable adjustment clamp, 9-extrusion adjustment wheel, 10-extrusion adjustment plate, 11-extrusion limit groove, 12-reset spring, 13-installation fixed plate, 14-adjustment control rope, 15-limit plate, 16-sliding adjustment block, 17-support fixed frame, 18-blocking wheel, 19-limit Support frame, 20-self-locking adjustment part, 21-sliding slot, 22-direction-changing blocking wheel, 23-support bracket, 24-L-shaped fixing frame, 25-sliding adjustment block, 26-pulling return spring, 27-extrusion fixing card plate, 28-sliding extrusion plate, 29-adjusting slot, 30-installing adjustment plate, 31-pulling control column, 32-stable swing arm, 33-blocking card column, 34-fixed connecting plate, 35-control arm, 36-adjusting arm. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] See also Figure 1-3, an embodiment of the present invention: an adaptive self-locking fixing device for a numerically controlled machine tool, comprising a pipe fitting 1, an adaptive control device 2, a supporting processing platform 3, a supporting mounting platform 4, a control connecting arm 5, a hydraulic cylinder 6 and a self-locking mechanism 7, the middle part of the self-locking mechanism 7 is fixedly connected to the upper end of the supporting processing platform 3, the bottom of the adaptive control device 2 is fixedly connected to the upper end of the self-locking mechanism 7, the pipe fitting 1 is clamped and fixed in the middle of the adaptive control device 2 and the self-locking mechanism 7, and the supporting mounting platform 4 is evenly and fixedly distributed in a circular shape. At the bottom end of the self-locking mechanism 7, the hydraulic cylinder 6 is fixedly mounted on the upper end of the outer end of the support mounting platform 4, and the control connecting arm 5 is fixedly connected to the front end of the hydraulic cylinder 6. The adapting and regulating device 2 includes a movable adjustment clamping plate 8, an extrusion adjustment wheel 9, an extrusion adjustment plate 10, an extrusion limit groove 11, a reset spring 12, an installation fixing plate 13, an adjustment control rope 14, a limit plate 15, a sliding adjustment block 16, a support fixing frame 17 and a blocking wheel 18. The support fixing frame 17 is provided with six circularly evenly distributed limit plates 15. The outer end is fixedly mounted on the middle part of the upper end of the supporting fixing frame 17, the mounting fixing plate 13 is fixedly mounted on the upper part of the outer end of the limiting plate 15, the sliding adjustment block 16 is slidably clamped inside the limiting plate 15, the return spring 12 is fixedly mounted between the mounting fixing plate 13 and the upper part of the outer end of the sliding adjustment block 16, the movable adjustment splint 8 is provided with six circularly evenly distributed, and the middle part of the bottom end of the movable adjustment splint 8 is fixedly connected to the upper part of one end of the sliding adjustment block 16 away from the mounting fixing plate 13, the extrusion limiting groove 11 is opened in the middle part of the upper end surface of the movable adjustment splint 8, the extrusion adjusting plate 10 is provided with six circularly evenly distributed, the extrusion adjusting wheel 9 is rotatably mounted on the middle part of the outer end surface of the extrusion adjusting plate 10, the extrusion adjusting wheel 9 is rotatably clamped in the inside of the extrusion limiting groove 11, the front ends of the two adjusting control ropes 14 are respectively fixedly connected to the two sides of the sliding adjustment block 16, the blocking wheel 18 is rotatably mounted on both sides of one end of the limiting plate 15 close to the bottom of the movable adjustment splint 8, and the adjusting control rope 14 passes through the middle part of the blocking wheel 18.

[0024] See also Figure 4 The self-locking mechanism 7 includes a limit support frame 19 and a self-locking adjustment portion 20. Six self-locking adjustment portions 20 are provided. The six self-locking adjustment portions 20 are circular and evenly distributed on the outside of the limit support frame 19. The upper end of the limit support frame 19 is evenly provided with sliding slots 21.

[0025] See also Figure 5-6The self-locking adjustment part 20 includes a direction-changing blocking wheel 22, a support bracket 23, an L-shaped fixing frame 24, a sliding adjustment card block 25, a pull reset spring 26, an extrusion fixed card plate 27, a sliding extrusion plate 28, an adjustment card slot 29, an installation adjustment plate 30, a pull control column 31, a control arm 35 and an adjustment arm 36. The L-shaped fixing frame 24 is evenly fixedly connected to the bottom of the limit support frame 19, the sliding adjustment card block 25 is slidably connected to the L-shaped fixing frame 24, the pull reset spring 26 is fixedly installed between the bottom end of the sliding adjustment card block 25 and the bottom of the L-shaped fixing frame 24, the support bracket 23 is fixedly installed at the upper end of the L-shaped fixing frame 24, and the direction-changing blocking wheel 22 is rotatably installed on the support bracket. 23, the sliding extrusion plate 28 is slidably connected to the inside of the sliding slot 21, the extrusion fixing plate 27 is fixedly connected to the front end of the sliding extrusion plate 28 by bolts, the front end of the adjusting arm 36 is rotatably connected to the middle of the sliding extrusion plate 28 through a rotating shaft, the end of the adjusting arm 36 is rotatably connected to the upper end of the control arm 35 through a rotating shaft, the adjusting slot 29 is opened inside the control arm 35, the pulling control column 31 is fixedly connected to the bottom end of the control arm 35, the installation adjustment plate 30 is symmetrically fixedly installed in the middle of the outer end of the sliding adjustment block 25, the blocking column 33 is rotatably installed between the outer end heads of the installation adjustment plate 30, and the blocking column 33 is slidably connected to the inside of the adjusting slot 29.

[0026] The outer end of the pulling control column 31 is fixedly connected to a stabilizing swing arm 32 , the upper end of the stabilizing swing arm 32 is connected to a fixed connecting plate 34 , and the upper end of the stabilizing swing arm 32 is rotatably clamped in the interior of the fixed connecting plate 34 , and the fixed connecting plate 34 is fixedly connected to the L-shaped fixing frame 24 .

[0027] The adjustment control rope 14 is fixedly connected to the upper end of the sliding adjustment block 25 through the blocking end of the direction-changing blocking wheel 22 .

[0028] One end of the control connecting arm 5 away from the hydraulic cylinder 6 is rotatably connected to the pulling control column 31 , and the supporting mounting platform 4 is fixedly connected to the bottom end of the L-shaped fixing frame 24 . The hydraulic cylinder 6 can pull the pulling control column 31 by controlling the connecting arm 5 .

[0029] The front end surface of the extrusion fixing clamp 27 is arranged in a concave arc shape, so that each of the circularly distributed extrusion fixing clamps 27 can be synchronously fitted and extruded to the outer wall of the pipe 1, so that the locking effect is better.

[0030] The bottom end of the position-limiting support frame 19 is fixedly connected to the upper end surface of the support processing table 3, the bottom end of the support fixing frame 17 is fixedly connected to the upper end of the position-limiting support frame 19, the upper end surface of the extrusion adjustment plate 10 is in extrusion contact with the outer wall of the pipe fitting 1, and the front end surface of the extrusion fixing clamping plate 27 is in extrusion contact with the outer wall of the pipe fitting 1. The pipe fitting 1 can be limited and self-locked by the extrusion adjustment plate 10 and the extrusion fixing clamping plate 27, so that the upper part of the pipe fitting 1 will not be displaced or shaken during the fine processing.

[0031] Working principle: First, insert the pipe fitting 1 between each extrusion adjustment plate 10. At this time, the bottom of the pipe fitting 1 squeezes each movable adjustment clamping plate 8 by squeezing the extrusion adjustment plate 10 and utilizing the extrusion adjustment wheel 9 located inside the extrusion limit groove 11. At this time, the six movable adjustment clamping plates 8 distributed in a circle slide along the limit plate 15 through the sliding adjustment block 16 to open outward. At this time, each sliding adjustment block 16 slides outward along the limit plate 15 to pull the front end of the adjustment control rope 14 to move along the limit plate 15. Since the adjustment control rope 14 passes through the blocking wheel 18 and the direction-changing blocking wheel 22 and changes direction, the other end is fixedly connected to the upper end of the sliding adjustment block 25. When the pulling force of the adjustment control rope 14 is greater than the elastic force of the pull reset spring 26, the pull reset The spring 26 is stretched, and the sliding adjustment block 25 slides upward along the L-shaped fixing frame 24 for a specified distance, and the blocking column 33 slides along the adjustment slot 29 to the specified position on the control arm 35. When the pipe 1 is stably inserted into the middle of the device through the guidance of each extrusion adjustment plate 10 in the adaptation and regulation device 2 and the bottom end of the pipe 1 contacts the middle of the upper end of the supporting processing table 3, each hydraulic cylinder 6 is started synchronously, and the control column 31 is pulled outward by the control connecting arm 5 through the contraction of the hydraulic cylinder 6. At this time, the control column 31 can be pulled to make the control arm 35 rotate with the blocking column 33 as the axis. The rotating control arm 35 squeezes the adjustment arm 36 through the upper end so that the adjustment arm 36 pushes the sliding extrusion plate 28 along the sliding slot. 21 can slide forward a specified distance, so the sliding extrusion plate 28 that slides forward a specified distance makes the extrusion fixing card plate 27 installed at its front end squeeze and contact with the bottom outer wall of the pipe fitting 1, and the sliding extrusion plate 28 and the extrusion fixing card plate 27 are evenly arranged, so each sliding extrusion plate 28 and the extrusion fixing card plate 27 synchronously squeeze and limit the outer wall of the pipe fitting 1 at different angles to complete the locking, and the upper end of the stable swing arm 32 rotates on the fixed connecting plate 34 during the rotation of the control arm 35, so that the control arm 35 is stable during the rotation process. When the diameter of the pipe fitting 1 is larger, the adjustment control rope 14 will pull the sliding adjustment block 25 and the partition card column 33 to rise to a higher distance. At this time, the partition card column 33 slides upward along the adjustment card slot 29. The larger the distance, the smaller the distance will be when the control arm 35 rotates around the blocking column 33. When the device is used, when pipes 1 of different diameters are inserted into the middle of the adapting and regulating device 2, the extrusion regulating plate 10 and the extrusion regulating wheel 9 in the adapting and regulating device 2 can be used to synchronously squeeze outwards to push each movable adjustment splint 8 and the sliding adjustment block 16 to synchronously slide outwards along the limit plate 15 by a specified distance. The distances that the sliding adjustment block 16 slides outwards along the limit plate 15 are different for pipes 1 of different diameters. Therefore, during the sliding process, the control rope 14 can be adjusted to control each self-locking adjustment part 20 in the self-locking mechanism 7 to adaptively squeeze and fix the bottom of the pipe 1.Therefore, the adapting and regulating device 2 plays a detection role, so that when pipe fittings 1 of different diameters are inserted into the middle part of the adapting and regulating device 2, the adapting and regulating device 2 can automatically control and adjust the clamping and locking strength of each self-locking adjustment part 20 after detection, and the squeezing and adjusting plate 10 in the adapting and regulating device 2 also plays a role in limiting and fixing the pipe fittings 1. The sliding adjustment block 25 is pulled by the adjusting control rope 14 so that the sliding adjustment block 25 slides upward along the L-shaped fixing frame 24, and when different pipe fittings 1 are inserted into the middle part of the adapting and regulating device 2 and the limiting support frame 19, the adjusting control rope 14 pulls the sliding adjustment block 25 to rise to different positions. Therefore, when the hydraulic cylinder 6 pulls the control arm 35 to rotate around the position of the blocking column 33 by controlling the connecting arm 5 and pulling the control column 31, the rotation amplitude of the control arm 35 changes. At this time, the adjusting arm 36 is controlled by the control arm 35 so that the sliding squeezing plate 28 slides along The sliding slot 21 slides forward at different distances, so that when the pipe 1 with a smaller diameter is inserted into the middle of the adapting and regulating device 2 and the limit support frame 19, the sliding extrusion plate 28 slides forward along the sliding slot 21 for a longer distance, so that the extrusion fixing plate 27 can fully contact and squeeze and lock with the outer wall of the pipe 1. Similarly, when the diameter of the pipe 1 is larger, the sliding extrusion plate 28 slides forward along the sliding slot 21 for a shorter distance, so that the extrusion fixing plate 27 can squeeze and contact with the outer wall of the pipe 1 with a larger diameter and lock and fix. Therefore, during the use of this device, it has the function of adaptive automatic adjustment according to the different diameters of the pipe 1, so that pipes 1 with different diameters can be adaptively locked and fixed after being inserted into the interior of this device. During the use of this device, pipes 1 with different diameters can be automatically adapted and adjusted to complete self-locking fixation, so that pipes 1 with different diameters can complete self-locking fixation before processing conveniently and quickly.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An adaptable and adjustable self-locking fixing device for a numerically controlled machine tool, comprising a pipe fitting (1), an adaptable and adjustable device (2), a supporting processing table (3), a supporting and mounting table (4), a control connecting arm (5), a hydraulic cylinder (6) and a self-locking mechanism (7), characterized in that: The middle part of the self-locking mechanism (7) is fixedly connected to the upper end of the supporting processing platform (3); the bottom of the adapting and regulating device (2) is fixedly connected to the upper end of the self-locking mechanism (7); the pipe (1) is clamped and fixed to the middle part of the adapting and regulating device (2) and the self-locking mechanism (7); the supporting mounting platform (4) is evenly fixedly distributed in a circular shape at the bottom end of the self-locking mechanism (7); the hydraulic cylinder (6) is fixedly mounted on the upper end of the outer end of the supporting mounting platform (4); the control connecting arm (5) is fixedly connected to the front end of the hydraulic cylinder (6); the adapting and regulating device (2) comprises a movable adjustment clamping plate (8), an extrusion adjustment wheel (9), an extrusion adjustment plate (10), an extrusion limiting groove (11), a return spring (12), an installation fixing plate (13), an adjustment control rope (14), a limiting plate (15), a sliding adjustment block (16), a support fixing frame (17) and a blocking wheel (18), wherein the support fixing frame (17) is provided with six uniformly distributed circular shapes, the outer end of the limiting plate (15) is fixedly mounted on the middle part of the upper end of the support fixing frame (17), and the installation fixing plate (13) is fixedly mounted on the limiting plate The sliding adjustment block (16) is slidably connected to the inner part of the limiting plate (15), the return spring (12) is fixedly installed between the mounting plate (13) and the upper part of the outer end of the sliding adjustment block (16), the movable adjustment clamping plate (8) is provided with six circular evenly distributed ones, and the middle part of the bottom end of the movable adjustment clamping plate (8) is fixedly connected to the upper part of one end of the sliding adjustment block (16) away from the mounting plate (13), the extrusion limiting groove (11) is opened in the middle part of the upper end surface of the movable adjustment clamping plate (8), the The extrusion adjustment plate (10) is provided with six evenly distributed circular wheels, the extrusion adjustment wheel (9) is rotatably mounted on the middle of the outer end surface of the extrusion adjustment plate (10), the extrusion adjustment wheel (9) is rotatably clamped inside the extrusion limiting groove (11), the front ends of the two adjustment control ropes (14) are respectively fixedly connected to the two sides of the sliding adjustment block (16), the blocking wheel (18) is rotatably mounted on the two sides of one end of the limiting plate (15) close to the bottom of the movable adjustment clamping plate (8), and the adjustment control rope (14) passes through the middle of the blocking wheel (18); The self-locking mechanism (7) comprises a limit support frame (19) and a self-locking adjustment part (20), six self-locking adjustment parts (20) are provided, and the six self-locking adjustment parts (20) are evenly distributed on the outer side of the limit support frame (19) in a circular shape, and the upper end of the limit support frame (19) is evenly provided with a sliding slot (21); The self-locking adjustment part (20) comprises a direction-changing blocking wheel (22), a support bracket (23), an L-shaped fixed frame (24), a sliding adjustment block (25), a pulling reset spring (26), an extrusion fixed card plate (27), a sliding extrusion plate (28), an adjustment slot (29), an installation adjustment plate (30), a pulling control column (31), a control arm (35) and an adjustment arm (36); the L-shaped fixed frame (24) is evenly fixedly connected to the bottom of the limit support frame (19); the sliding adjustment block (25) is slidably connected to the L-shaped fixed frame (24); the pulling reset spring (26) is fixedly installed between the bottom end of the sliding adjustment block (25) and the bottom of the L-shaped fixed frame (24); the support bracket (23) is fixedly installed on the upper end of the L-shaped fixed frame (24); the direction-changing blocking wheel (22) is rotatably installed on the support bracket (23); The upper part of the bracket (23), the sliding extrusion plate (28) is slidably clamped in the interior of the sliding clamping groove (21), the extrusion fixing clamping plate (27) is fixedly connected to the front end of the sliding extrusion plate (28) by bolts, the front end of the adjustment arm (36) is rotatably connected to the middle part of the sliding extrusion plate (28) by a rotating shaft, the end of the adjustment arm (36) is rotatably connected to the upper end of the control arm (35) by a rotating shaft, the adjustment clamping groove (29) is opened in the interior of the control arm (35), the pulling control column (31) is fixedly connected to the bottom end of the control arm (35), the installation adjustment plate (30) is symmetrically fixedly installed in the middle part of the outer end of the sliding adjustment block (25), the blocking clamping column (33) is rotatably installed between the outer end heads of the installation adjustment plate (30), and the blocking clamping column (33) is slidably clamped in the interior of the adjustment clamping groove (29).

2. The adaptive and adjustable self-locking fixing device for a CNC machine tool according to claim 1, characterized in that: The outer end of the pulling control column (31) is fixedly connected to a stabilizing swing arm (32), the upper end of the stabilizing swing arm (32) is connected to a fixed connecting plate (34), and the upper end of the stabilizing swing arm (32) is rotatably clamped inside the fixed connecting plate (34), and the fixed connecting plate (34) is fixedly connected to the L-shaped fixing frame (24).

3. The adaptive and adjustable self-locking fixing device for a CNC machine tool according to claim 2, characterized in that: The adjustment control rope (14) is fixedly connected to the upper end of the sliding adjustment block (25) through the blocking end of the direction-changing blocking wheel (22).

4. The adaptive and adjustable self-locking fixing device for a CNC machine tool according to claim 3, characterized in that: One end of the control connecting arm (5) away from the hydraulic cylinder (6) is rotatably connected to the pulling control column (31), and the supporting mounting platform (4) is fixedly connected to the bottom end of the L-shaped fixing frame (24).

5. The adaptive and adjustable self-locking fixing device for a CNC machine tool according to claim 4, characterized in that: The front end surface of the pressing and fixing clamping plate (27) is arranged in a concave arc shape.

6. The adaptive and adjustable self-locking fixing device for a CNC machine tool according to claim 5, characterized in that: The bottom end of the position-limiting support frame (19) is fixedly connected to the upper end surface of the support processing table (3), the bottom end of the support fixing frame (17) is fixedly connected to the upper end of the position-limiting support frame (19), the upper end surface of the extrusion adjustment plate (10) is in extrusion contact with the outer wall of the pipe fitting (1), and the front end surface of the extrusion fixing clamping plate (27) is in extrusion contact with the outer wall of the pipe fitting (1).

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