Oil and gas dual control anti-deformation tailstock and its application

Abstract

The present invention relates to an oil-gas dual-control anti-deformation tailstock, comprising a tail shaft, a sealing ring, a rear end cover, a round nut, a front interface, a bushing, an annular hydraulic groove, an oil inlet, a bearing, a core shaft, a tapered shank, a front end cover, a fixing sleeve, a tailstock wall, an ejector shaft, a sliding cavity, and a rear interface. The core shaft is a shaft with an inner hole cavity, a fixing sleeve is provided in the inner hole of the core shaft, and a tapered shank is fastened to one end of the ejector cavity inside the core shaft through the fixing sleeve and a hexagon socket screw. Bearings are provided at both ends of the core shaft, and the core shaft is slidably inserted in the middle of the sliding cavity of the tailstock wall. The device and application of the present invention can not only install the ejector to automatically push the ejector to press the workpiece, but also install a spring clamp (18) to hold or tighten the workpiece to prevent deformation caused by processing thin-walled parts.

Description

Technical Field

[0001] The invention relates to a tooling fixture for processing rotary parts, in particular to an oil-gas dual-control anti-deformation tailstock and its application. Background Art

[0002] With the continuous improvement of precision requirements for aircraft engine processing, the requirements for machining precision of thin-walled rotary parts are also getting higher and higher. The rotary workpiece is obtained by rotating a generatrix around the rotary axis. The generatrix can be a straight line segment, an arc or a curve, and the surface shape can be a cylindrical surface and a conical surface, etc. For example, when machining shaft workpieces, one end is fixed on the chuck, and the other end needs to be held or pulled outward by a rotary device to ensure that the workpiece does not deform during machining. If the traditional tailstock wall ejector is directly used to support the machining, the machining precision of the workpiece cannot be controlled, resulting in the scrapping of the workpiece and losses.

[0003] The existing processing uses two processing methods: dual-drive rotary shaft equipment (auxiliary rotary shaft has power) or driven rotary device (auxiliary rotary shaft has no power). When the dual-drive rotary shaft equipment is processed at more than 200 rpm, inertia will produce additional torque on the product, causing deformation of thin-walled parts; and the driven rotary device generally requires a certain torque to rotate. During the processing, when the active rotary shaft rotates, the driven rotary device is driven by the thin-walled part to produce hysteresis torque, causing the part to deform. Therefore, the driven rotary device is more suitable for heavy parts. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a device that can automatically push the ejector pin to press, tighten or keep the workpiece stationary, and can effectively lock the axial position of the ejector pin, so that the workpiece can be clamped conveniently and the tool clamping efficiency is high. The oil-gas dual-control anti-deformation tailstock and its application, the specific technical scheme is:

[0005] The oil-gas dual-control anti-deformation tailstock comprises a tail shaft 1, a sealing ring 2, a rear end cover 3, a round nut 5, a front interface (air or oil inlet) 6, a bushing 7, an annular hydraulic groove 8, an oil inlet 9, a bearing 14 / 27, a mandrel 17, a taper handle 19, a front end cover 20, a fixed sleeve 21, a tailstock wall 24, a pin shaft 25, a sliding cavity 26, and a rear interface 28. The mandrel 17 is a shaft with an inner hole cavity, a fixed sleeve 21 is provided in the inner hole of the mandrel, and a taper handle 19 is provided through The fixing sleeve 21 and the hexagon socket screw 22 are fastened to one end of the inner hole cavity (thrust pin cavity 23) of the core shaft 17. The two ends of the core shaft 17 are supported by (tapered roller) bearings 14 / 27, and the core shaft 17 is slidably inserted in the middle of the sliding cavity 26 of the tail seat wall 24; the tail shaft 1 is slidably inserted in one end of the sliding cavity 26, and one end of the tail shaft 1 extends out of the end hole of the tail seat wall 24 and is located at the end of the tail seat wall 24 away from the ejector, that is, the left end, and the second end of the tail shaft 1 is the right end. The first end, i.e., the left end, of the ejector shaft 25 is also fixed; the second end of the ejector shaft 25 is a Y-shaped opening fixed front end cover 20; the ejector shaft 25 is sleeved on the outside of the core shaft 17, and the cone handle 19 extends out of the ejector shaft 25; the bushing 7 is installed in the sliding hole 26 and clamps the ejector shaft 25, and the bushing 7 is fixed to the left end of the near tailstock wall 24, and the outer circumferential side of the bushing 7 is provided with an annular hydraulic groove 8, and the ejector shaft 25 is slidably inserted in the bushing 7; the left side of the tailstock wall 24 A rear end cover is provided at the end, and a rear interface 28 is provided on the side of the rear end cover 3, and the rear interface 28 is connected to the cavity near the right end of the tail shaft 1 (the pneumatic air pressure of the cavity drives the entire ejector shaft and the core shaft to slide). The tail seat wall 24 is also provided with a (air intake or oil intake) front interface 6 connected to the sliding cavity 26, and the (air intake or oil intake) front interface 6 is located on the left side of the bushing 7 (the other side of the cavity), and the tail seat wall 24 is provided with an oil inlet 9, which is communicated with the annular hydraulic groove 8.

[0006] A piston is provided in the cavity; the rear interface 28 and the (air or oil inlet) front interface 6 are both communicated with the sliding hole cavity 26.

[0007] The round nut 5 fixes the mandrel 17 to the ejector shaft 25 (such as through the end cover and the step structure); and the bushing 7, and the round nut 5, the round nut 5 is fixed to one end of the mandrel;

[0008] By adopting the above technical solution, the rear interface 28 is connected to the air pressure electromagnetic valve, and the (oil inlet) front interface 6 and the oil inlet 9 are respectively connected to the hydraulic electromagnetic valve. The air inlet front interface 6 is connected to the air circuit.

[0009] When the workpiece is pressed, air is taken in through the rear interface 28 (air or oil is taken in), and oil or air is returned through the front interface 6. The high-pressure gas pushes the tail shaft 1 to move along the axis of the sliding bore 26 toward the front end of the tail seat wall 24. The tail shaft 1 pushes the core shaft 17 to move, and the core shaft 17 presses the ejector onto the center hole of the workpiece. When the set pressure is reached, the high-pressure hydraulic oil then enters the oil inlet 9, and the high-pressure hydraulic oil enters the annular hydraulic groove 8. The bushing 7 is deformed by force and pressed onto the ejector shaft 25, and the core shaft 17 is fixed in the ejector shaft 25 by the round nut 5, thereby realizing the positioning of the core shaft 17.

[0010] When the workpiece is loosened, the oil inlet 9 releases pressure, the front interface 6 takes in oil or air (air or oil), and the rear interface 28 exhausts air. The air pressure pushes the tail shaft 1 to move toward the rear end of the tailstock wall 24, and the core shaft 17 drives the ejector pin to leave the center hole of the workpiece.

[0011] The present invention is particularly applied to the oil return or oil inlet of the front oil inlet port 6. One end of the piston is gas and the other end is oil. When the workpiece is pressed, the rear port 28 is gas-intaken and the front port 6 is oil-returned. When the workpiece is released, the oil inlet port 9 is depressurized and the front port 6 is oil-intaken.

[0012] High-pressure gas is used to automatically push the mandrel 17 to move. There is no need to manually turn the handwheel. The worker only needs to ensure that the axis of the workpiece and the axis of the ejector are basically aligned, and then start the solenoid valve to automatically press the ejector in and automatically lock the mandrel 17 to fix the position of the ejector. It is very convenient to use, greatly shortens the clamping time of the workpiece, and improves processing efficiency.

[0013] When the air pressure pushing the mandrel 17 reaches a certain value, the hydraulic system starts to lock the mandrel 17.

[0014] Preferably, it further comprises a rear end cover 3 , which is fixed to one end of the tailstock wall 24 , and the mandrel 17 is slidably inserted on the rear end cover 3 . A rear interface 28 is provided on the rear end cover 3 , and the rear interface 28 is communicated with the sliding hole 26 .

[0015] By adopting the above technical solution and using the rear end cover 3 , the difficulty of processing the sliding hole 26 of the tailstock wall 24 can be reduced, so that the sliding hole 26 is a long through hole and is easy to install.

[0016] Preferably, the rear end cover 3 is provided with a first dustproof sealing ring 2 and a first Y-shaped sealing ring 29 .

[0017] By adopting the above technical solution, the first dustproof sealing ring 2 can prevent dust and other debris from entering the sliding cavity 26 , thereby protecting the tail shaft 1 and the sliding hole cavity 26 .

[0018] The first Y-shaped sealing ring 29 improves the sealing effect and prevents air leakage.

[0019] Preferably, the core shaft 17 is a stepped shaft (with steps), which is wrapped with the end steps of the tail shaft 1 and the ejector shaft 25 which are arranged in sequence and have increasing diameters. The tail shaft 1 is slidably inserted in the inner hole of the rear end cover 3, and the end of the tail shaft 1 is fixed on the ejector shaft 25. The inner center hole of the core shaft 17 is provided with an ejector cavity 23, and the outer side wall of the ejector shaft 25 is slidably inserted into the bushing 7.

[0020] By adopting the above technical solution, the tail shaft 1 with an increased diameter, that is, the step at the right end of the tail shaft 1 , limits the moving position of the core shaft 17 on the rear end cover 3 .

[0021] Preferably, it also includes a round nut 5, which is fixed on the core shaft 17, and the round nut 5 fixes the core shaft 17 on the ejector shaft 25; the front end cover 20 is fixed to the front end surface of the ejector shaft 25; and a first sealing ring 4, which is sleeved and fixed on the tail shaft 1 and is located between the tail shaft 1 and the tail seat wall 24.

[0022] By adopting the above technical solution, the round nut 5 and the end of the ejector shaft 25 limit the position of the tail shaft 1 to prevent the tail shaft 1 from axial movement.

[0023] By adopting the above technical solution, the two first sealing rings 4 can improve the sealing performance of the tail shaft 1 and prevent the hydraulic oil from entering the cavity of the tail shaft 1 .

[0024] Preferably, a second sealing ring 10 is installed at both ends of the outer cylindrical surface of the bushing 7, i.e., at both ends of the annular hydraulic groove 8; two third Y-shaped sealing rings 12 are symmetrically installed on the inner cylindrical surface of the bushing 7, which are used to seal the sliding of the outer wall of the ejector shaft 25, and the third Y-shaped sealing ring 12 and the second sealing ring 10 are both located at one end of the tail seat wall 24.

[0025] By adopting the above technical solution, the second sealing ring 10 prevents the leakage of hydraulic oil.

[0026] Preferably, an anti-rotation sleeve 30 is further included, and the anti-rotation sleeve 30 is fixed to the top end (left end) of the tail shaft 1.

[0027] By adopting the above technical solution, a set screw is installed on the anti-rotation sleeve 30 when necessary, and the set screw is screwed into the anti-rotation groove on the tail shaft 1. The anti-rotation sleeve 30 is connected to the limiting mechanism on the machine tool to prevent the core shaft 17 from rotating.

[0028] Preferably, an annular deformation groove 11 is provided on the inner circumferential surface of the bushing 7 , and the deformation groove 11 is located at the lower sides of both ends of the annular hydraulic groove 8 .

[0029] By adopting the above technical solution, the deformation groove 11 allows the bushing 7 to have a radially deformable gap, which facilitates the deformation of the hydraulic groove.

[0030] Preferably, the bearings provided at both ends of the mandrel 17 are tapered roller bearings 14 / 27, and the tapered roller bearings 14 / 27 are located at both ends of the sliding cavity 26. The function of the tapered roller bearings 14 / 27 is to facilitate the high-speed rotation of the mandrel 17 and prevent the mandrel 17 from moving left and right.

[0031] Preferably, a fastening device is provided inside the core shaft 17 , and the fastening device includes a hexagon socket screw 22 and a fixing sleeve 21 .

[0032] By adopting the above technical solution, the fixing sleeve 21 is fixed to the inner hole of the core shaft 17 through threads, and the hexagon socket screw 22 is connected to the workpiece through the tapered shank 19.

[0033] Preferably, a volute spring 13 is provided inside the front end cover 20, and the volute spring 13 is fixed between the front end cover 20 and the tail seat wall 24. The function of the volute spring 13 is to prevent iron filings and foreign matter from entering the tail seat wall 24 device and prevent the tail seat wall 24 from getting stuck.

[0034] Compared with the prior art, the present invention has the following beneficial effects: the oil-gas dual-control anti-deformation tailstock provided by the present invention can automatically push the ejector pin to press the workpiece, and can effectively lock the axial position of the ejector pin, making the workpiece clamping convenient, the tool clamping efficiency high, the structure simple, and adaptable to a variety of machine tools. The device and application of the present invention can not only install the ejector pin, by automatically pushing the ejector pin to press the workpiece, but also install the spring collet 18 to hold or tighten the workpiece to prevent deformation caused by the processing of thin-walled parts. According to the requirements for the workpiece to be processed, these two methods can effectively lock the ejector pin to the axial positioning of the workpiece, making the workpiece clamping convenient, the tool clamping efficiency high, the structure simple, and adaptable to a variety of machine tools, and have a certain degree of interchangeability. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural diagram of the oil-gas dual-control anti-deformation tailstock;

[0036] Figure 2 It is a cross-sectional structural diagram of the top clamping method of the oil-gas dual-control anti-deformation tailstock;

[0037] Figure 3 It is a schematic diagram of the cross-sectional structure of different tops (staying still, stretching mode) of the oil-gas dual-control anti-deformation tailstock; DETAILED DESCRIPTION

[0038] The present invention will be further described with reference to the accompanying drawings.

[0039] like Figures 1 to 3As shown, the oil-gas dual-control anti-deformation tailstock includes a core shaft 17 and a tailstock wall 24, and an ejector shaft 25. The core shaft 17 is a core shaft with an inner hole cavity, and the inner hole is provided with a fixing sleeve 21. The tapered handle 19 is fastened to the inside of the core shaft 17 through the fixing sleeve 21 and the hexagon socket screw 22. The two ends of the core shaft 17 are provided with tapered roller bearings 14 / 27, and one end of the core shaft 17 is provided with an ejector inner hole cavity 23. The core shaft 17 is slidably inserted in the sliding cavity 26 of the tailstock wall 24; it also includes a tail shaft 1, the tail shaft 1 is slidably inserted in the sliding hole cavity 26, and the tail shaft 1 is located at the other end (left end) of the tailstock wall 24 away from the ejector, and the tail shaft 1 is also fixed to the core shaft 17 and to one end (left end) of the ejector shaft 25; the front end cover 20 is fixed to the other end of the ejector shaft 25; The round nut 5 is fixed to one end of the core shaft; the round nut 5 fixes the core shaft 17 to the ejector shaft 25; the bushing 7 is installed in the sliding hole 26, and the bushing 7 is fixed to the other end of the tail seat wall 24, the outer cylindrical surface of the bushing 7 is provided with an annular hydraulic groove 8, and the ejector shaft 25 is slidably inserted on the bushing 7; the left end of the tail seat wall 24 is provided with a rear end cover, and the side of the rear end cover 3 is provided with a rear interface 28, and the rear interface 28 is located at the left end of the tail shaft 1, and the tail seat wall 24 is also provided with a (air intake or oil intake) front interface 6, and the (air intake or oil intake) front interface 6 is located at one end of the bushing 7, and the rear interface 28 and the (air intake or oil intake) front interface 6 are both communicated with the sliding hole 26; the tail seat wall 24 is provided with an oil inlet 9, and the oil inlet 9 is communicated with the annular hydraulic groove 8.

[0040] The (air or oil inlet) front interface 6, the oil inlet 9 and the rear interface 28 are respectively connected to the solenoid valves, the solenoid valve of the rear interface 28 is connected to the high-pressure air source, and the (air or oil inlet) front interface 6 and the oil inlet 9 solenoid valve are connected to the hydraulic pump.

[0041] Specifically, it also includes a rear end cover 3, one end of which is provided with a flange, and the rear end cover 3 is fixed to the rear end of the tail seat wall 24 through the flange, and the rear end cover 3 is inserted in the sliding hole 26, and a sealing ring is installed between the rear end cover 3 and the sliding hole 26, and the core shaft 17 is slidably inserted on the rear end cover 3, and a rear interface 28 is provided on the side of the rear end cover 3, and the rear interface 28 is communicated with the cavity on the left side of the left end piston of the sliding hole 26, and the rear interface 28 is connected to the cavity near the right end of the tail shaft 1, and the piston fixes the ejector shaft 25, which is close to the sealing ring 4. The use of the rear end cover 3 can reduce the difficulty of processing the sliding hole 26 of the tail seat wall 24, so that the sliding hole 26 is a long through hole, and it is easy to install.

[0042] The mandrel 17 is a stepped shaft, including a tail shaft 1 and an ejector shaft 25 which are arranged in sequence and whose diameters increase in sequence, the tail shaft 1 is slidably inserted on the rear end cover 3, the ejector shaft 25 is equipped with the tail shaft 1, the mandrel 17 is provided with an ejector cavity 23, and the ejector shaft 25 is slidably inserted on the bushing 7. The tail shaft 1 limits the moving position of the mandrel 17 on the rear end cover 3.

[0043] A first dustproof sealing ring 2 and a first Y-shaped sealing ring 29 are mounted on the rear end cover 3 , and the first dustproof sealing ring 2 and the first Y-shaped sealing ring 29 are used to seal the tail shaft 1 .

[0044] The first dustproof sealing ring 2 can prevent dust and other debris from entering the movable cavity, thereby protecting the tail shaft 1 and the sliding hole cavity 26 .

[0045] The first Y-shaped sealing ring 29 improves the sealing effect and prevents air leakage.

[0046] Two first sealing rings 2 are symmetrically mounted on the outer circumferential surface of the tail shaft 1. The two first sealing rings 2 can improve the sealing performance of the tail shaft 1 and prevent air leakage when the rear interface air intake pushes the tail shaft 1 forward.

[0047] It also includes a round nut 5, which is fixed on the core shaft 17 and is used to fix the tapered roller bearing 27 on the core shaft 17; the round nut 5 fixes the core shaft 17 on the ejector shaft 25; the front end cover 20 is fixed on the ejector shaft 25; and the tapered roller bearing 14 / 27, which is fixed on both ends of the core shaft 17 and is located between the core shaft 17 and the ejector shaft 25.

[0048] A flange is provided at one end of the bushing 7 , and the bushing 7 is fixed to the front end of the tailstock wall 24 through the flange.

[0049] The second sealing ring 10 is installed at both ends of the outer circumferential surface of the bushing 7, and the second sealing ring 10 is located at both ends of the annular hydraulic groove 8; the third Y-shaped sealing ring 12 is installed on the inner circumferential surface of the bushing 7, and the third Y-shaped sealing ring 12 is located at the front end of the tail seat wall 24.

[0050] The second sealing ring 10 prevents the hydraulic oil from entering the bore of the tail shaft 1 .

[0051] The inner circumferential surface of the bushing 7 is provided with an annular deformation groove 10 , and the deformation groove 10 is located at both ends of the annular hydraulic groove 8 .

[0052] The anti-rotation sleeve 30 is also included and fixed to the other end of the core shaft 17 .

[0053] The anti-rotation sleeve 30 is provided with a set screw, which is screwed into the anti-rotation groove on the mandrel 17. The anti-rotation sleeve 30 is connected to a limiting mechanism on the machine tool to prevent the mandrel 17 from rotating.

[0054] When the workpiece is pressed, air is taken in through the rear interface 28, and the high-pressure gas through the front interface (air or oil) pushes the tail shaft 1 to move along the axis of the sliding cavity 26 toward the front end of the inner wall of the tail seat wall 24, and the tail shaft 1 pushes the core shaft 17 to move, and the core shaft 17 presses the ejector onto the center hole of the workpiece, and then the high-pressure hydraulic oil enters the oil inlet 9, and the high-pressure hydraulic oil enters the annular hydraulic groove 8. The annular hydraulic groove 8 is radially deformed after being stressed, and the bushing 7 is deformed and pressed on the ejector shaft 25, and the core shaft 17 is fixed in the ejector shaft 25 through the round nut 5 and the front end cover 20, thereby realizing the positioning of the core shaft 17.

[0055] When the workpiece needs to be loosened, the oil inlet 9 is depressurized, the front interface 6 takes in air (air or oil), and the rear interface 28 exhausts air. The high-pressure gas pushes the tail shaft 1 to move toward the rear end of the tailstock wall 24, and the core shaft 17 drives the ejector pin to leave the center hole of the workpiece.

[0056] Workpiece 15 spring collet 18, locking nut 18-1. Tapered roller bearing 14 / 27 is used to maintain thrust, bearing force and rotation support.

[0057] High-pressure gas is used to automatically push the mandrel 17 to move. There is no need to manually turn the handwheel. The worker only needs to ensure that the axis of the workpiece and the axis of the ejector are basically aligned, and then start the solenoid valve to automatically press the ejector in and automatically lock the mandrel 17 to fix the position of the ejector. It is very convenient to use, greatly shortens the clamping time of the workpiece, and improves processing efficiency.

Claims

1. Oil and gas dual control anti-deformation tailstock, its characteristics are: The invention comprises a tail shaft (1), a sealing ring (2), a rear end cover (3), a round nut (5), a front interface (6), a bushing (7), an annular hydraulic groove (8), an oil inlet (9), a bearing (14 / 27), a core shaft (17), a tapered handle (19), a front end cover (20), a fixed sleeve (21), a tail seat wall (24), an ejector shaft (25), a sliding cavity (26), and a rear interface (28), wherein the core shaft is a shaft having an inner hole cavity, a fixed sleeve (21) is provided in the inner hole of the core shaft, and a tapered handle is provided, and the tapered handle is fastened to one end of the ejector cavity (23) inside the core shaft through the fixed sleeve and a hexagon socket screw, bearings are provided at both ends of the core shaft, and the core shaft is slidably inserted in the middle of the sliding cavity of the tail seat wall; the tail shaft is slidably inserted in one end of the sliding cavity, and one end of the tail shaft extends The end hole of the tailstock wall and the end of the tailstock wall away from the ejector, i.e., the left end, the second end, i.e., the right end, of the tail shaft also fixes the first end, i.e., the left end, of the ejector shaft; the second end of the ejector shaft is a Y-shaped opening that fixes the front end cover; the ejector shaft sleeve is on the outside of the core shaft, and the tapered handle extends out of the ejector shaft; the bushing is installed in the sliding hole and clamps the ejector shaft, and the bushing is fixed to the left end near the tailstock wall, and the outer circular side surface of the bushing is provided with an annular hydraulic groove, and the ejector shaft is slidably inserted in the bushing; the left end of the tailstock wall is provided with a rear end cover, and the side surface of the rear end cover is provided with a rear interface, and the rear interface is connected to the cavity near the right end of the tail shaft, and the tailstock wall is also provided with an oil inlet front interface connected to the sliding cavity, and the oil inlet front interface is located on the left side of the bushing, and the tailstock wall is provided with an oil inlet, which is communicated with the annular hydraulic groove; The front interface for oil inlet returns oil or inlets oil; one end of the piston is air and the other end is oil; when the workpiece is compressed, air is inlet through the rear interface and oil is returned through the front interface; when the workpiece is released, the oil inlet is depressurized and oil is inlet through the front interface.

2. The oil-gas dual-control anti-deformation tailstock according to claim 1 is characterized in that: The round nut fixes the mandrel on the ejector shaft; the round nut is fixed to one end of the mandrel.

3. The oil-gas dual-control anti-deformation tailstock according to claim 1, characterized in that: The rear end cover is provided with a first dustproof sealing ring and a first Y-shaped sealing ring.

4. The oil-gas dual-control anti-deformation tailstock according to claim 1, characterized in that: The core shaft is a stepped shaft, which is wrapped by the tail shaft end steps and the ejector shaft which are arranged in sequence and have increasing diameters. The tail shaft is slidably inserted in the inner hole of the rear end cover, and the tail shaft end is fixed on the ejector shaft. The inner center hole of the core shaft is provided with an ejector cavity, and the outer side wall of the ejector shaft is slidably inserted into the bushing.

5. The oil-gas dual-control anti-deformation tailstock according to claim 1, characterized in that: The two ends of the outer circumferential surface of the bushing are provided with second sealing rings, and the second sealing rings are located at the two ends of the annular hydraulic groove; The inner circle of the bushing is provided with a third Y-shaped sealing ring; the interior of the front end cover is provided with a second dustproof sealing ring, and the third Y-shaped sealing ring and the second dustproof sealing ring are both located at one end of the tailstock wall.

6. The oil-gas dual-control anti-deformation tailstock according to claim 1, characterized in that: An anti-rotation sleeve is also provided, and the anti-rotation sleeve is fixed to the other end of the core shaft (17).

7. The oil-gas dual-control anti-deformation tailstock according to claim 1, characterized in that: The inner circular surface of the bushing is provided with an annular deformation groove, and the deformation groove is located at two ends of the annular hydraulic groove.

8. The oil-gas dual-control anti-deformation tailstock according to claim 1, characterized in that: A piston is arranged in the cavity.

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