A machine tool spindle tool release drive system

Abstract

A machine tool spindle tool loosening driving system, comprising: a cylinder body; a piston, one end of the piston being slidably inserted into the cylinder body and the other end of the piston extending out of the cylinder body to the outside; a limiting piece, the limiting piece being arranged at the other end of the piston; a spring, the spring being sleeved on the piston and located between the cylinder body and the limiting piece; a sealing assembly, the sealing assembly being sealingly connected between the piston and the cylinder body; and a tool loosening rod, the tool loosening rod penetrating through the piston in the axial direction and being rotationally connected with the piston, one end of the tool loosening rod extending into the machine tool spindle and being connected with a tool assembly, and the other end of the tool loosening rod being used for connecting a pipeline. The machine tool spindle tool loosening driving system disclosed by the present application is driven by a single-cylinder hydraulic oil cylinder composed of the cylinder body and the piston to extend the tool loosening rod towards the machine tool spindle to perform a tool loosening action, the piston end of the hydraulic oil cylinder extends out of the cylinder body, a spring is arranged between the limiting piece at the piston end and the cylinder body, and the spring restoring force is used to realize the retraction action of the tool loosening rod; and the sealing assembly is used to seal between the piston and the cylinder body.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of machining, and more particularly, to a machine tool spindle tool releasing driving system. BACKGROUND

[0002] Numerical control horizontal milling and boring machine is applied to various mechanical industries due to its wide machining range. With the rapid development of manufacturing industry, users have more and more requirements for the configuration of numerical control milling and boring machine, especially the tool magazine and spindle internal cooling. In this case, the tool releasing action of the machine tool spindle is required to be higher, and the tool releasing position and the response speed of the tool releasing mechanism after releasing the tool have a great influence on the precision of the machined workpiece. At present, the tool releasing mechanism of large machine tools mostly uses bidirectional oil cylinder action, and the hydraulic oil leakage occurs, and the response of the recovery action after releasing the tool is slow. Therefore, a machine tool spindle tool releasing driving system is needed to solve at least one of the above problems. SUMMARY

[0003] The purpose of the present application is to provide a machine tool spindle tool releasing driving system to at least solve one of the problems of slow action response and oil leakage of the existing structure.

[0004] In order to achieve the above purpose, the present application provides a machine tool spindle tool releasing driving system, comprising:

[0005] a cylinder body;

[0006] a piston, one end of the piston being slidably inserted into the cylinder body, the other end of the piston extending out of the cylinder body;

[0007] a limiting piece, the limiting piece being arranged at the other end of the piston;

[0008] a spring, the spring being sleeved on the piston and located between the cylinder body and the limiting piece;

[0009] a sealing assembly, the sealing assembly being sealingly connected between the piston and the cylinder body;

[0010] a tool releasing rod, the tool releasing rod penetrating the piston in the axial direction and being rotationally connected with the piston, one end of the tool releasing rod extending into the machine tool spindle and being connected with a tool assembly, the other end of the tool releasing rod being used for connecting a pipeline.

[0011] Preferably, a flange cover is further included, the flange cover comprising a flange cover main body and a boss located at one end of the flange cover main body, the flange cover main body being buckled at one end of the cylinder body, and the boss being embedded in the cylinder body, the other end of the cylinder body being arranged towards the machine tool spindle;

[0012] The piston comprises a straight cylinder section and a clamping table connected to the outer wall of one end of the straight cylinder section, the outer peripheral wall of the clamping table is sealingly connected to the inner wall of the cylinder body, the straight cylinder section passes through the flange cover and is sealingly connected to the flange cover, and the loosening tool rod is rotationally connected to the straight cylinder section through a bearing assembly.

[0013] Preferably, an oil inlet is arranged on the side wall of the cylinder body close to the flange cover, the oil inlet is in communication with a hydraulic oil circuit through a pipe joint, the clamping table of the piston can move away from the flange cover under the action of hydraulic oil and drive the loosening tool rod to move synchronously;

[0014] The sealing assembly comprises at least one first sealing element, a second sealing element and a third sealing element, at least one first sealing element is arranged between the outer peripheral wall of the clamping table and the inner wall of the cylinder body, the second sealing element is arranged between the outer peripheral wall of the straight cylinder section and the inner wall of the boss, and the third sealing element is arranged between the end face of the flange cover body and the end face of the cylinder body.

[0015] Preferably, the first sealing element is a pair of first and second gaskets arranged in parallel;

[0016] And / or,

[0017] The second sealing element is a stellite seal.

[0018] Preferably, the limiting member is annular, the inner wall of the limiting member is provided with threads, and the limiting member is threadedly connected to the piston;

[0019] The limiting member is provided with a tool hole perpendicular to the axial direction for connecting a tightening tool.

[0020] Preferably, a guide sleeve and a guide key are further included, the guide sleeve is sleeved on the other end of the loosening tool rod, the inner wall of the straight cylinder section of the piston is provided with a key groove parallel to the axial direction, the guide key is arranged on the guide sleeve in the axial direction and is slidingly connected in the key groove.

[0021] Preferably, the loosening tool rod comprises a first rod section, a second rod section and a third rod section connected in sequence and decreasing in diameter, and the guide sleeve is rotationally connected to the third rod section.

[0022] The bearing assembly comprises a spacer sleeve, a first bearing, a first inner spacer sleeve, a second bearing, a second inner spacer sleeve and a locking nut, which are sequentially sleeved between the third rod section and the guide sleeve in the direction away from the cylinder body.

[0023] The inner wall of one end of the guide sleeve towards the flange cover is provided with a limiting step for clamping the first bearing, the guide sleeve is internally provided with a first outer spacer sleeve sleeved on the first inner spacer sleeve, a second outer spacer sleeve sleeved on the second inner spacer sleeve, and an elastic stop ring sleeved on the loosening tool rod between the second outer spacer sleeve and the locking nut.

[0024] Preferably, an adjusting pad is further included, the inner wall of the straight cylinder section of the piston is provided with a support ring, the second rod section of the loosening tool rod passes through the support ring, and the adjusting pad is connected to one side of the support ring towards the machine tool spindle.

[0025] Preferably, the distance between the adjusting pad and the first rod section of the loosening tool rod is 2.5-7.5mm when no oil is injected into the cylinder body.

[0026] Preferably, the loosening tool rod is provided with an axial through hole, the other end of the loosening tool rod is provided with a rotary joint in communication with the through hole, and the rotary joint is used for communicating with an air pipe or a water pipe.

[0027] The machine tool spindle loosening tool driving system has the advantages that the loosening tool rod is driven to extend towards the machine tool spindle by the single-cylinder hydraulic oil cylinder composed of a cylinder body and a piston to perform a loosening tool action, the piston end of the hydraulic oil cylinder extends out of the cylinder body, a spring is arranged between the limiting member at the piston end and the cylinder body, the return action of the loosening tool rod is realized by the restoring force of the spring, and the loosening tool rod is quickly and stably and reliably returned; the piston and the cylinder body are sealed by the sealing assembly, and leakage of hydraulic oil is prevented.

[0028] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0029] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which like reference characters refer to like parts throughout the several views.

[0030] Figure 1 A structural schematic view of a machine tool spindle loosening tool driving system of one exemplary embodiment of the present application is shown.

[0031] EXPLANATION OF REFERENCE CHARACTERS:

[0032] 1, limiting piece; 101, tool hole; 102, top screw; 2, spring; 3, flange cover; 301, boss; 4, pipe joint; 5, third sealing element; 6, piston; 601, clamping table; 7, loosening tool rod; 8, adjusting pad; 9, second sealing element; 10, first garter; 11, second garter; 12, cylinder; 13, spacer sleeve; 14, first bearing, first angular contact ball bearing; 15, first outer spacer sleeve; 16, first inner spacer sleeve; 17, second bearing, second angular contact ball bearing; 18, locking nut; 19, rotary joint; 20, second inner spacer sleeve; 21, elastic retainer; 22, second outer spacer sleeve; 23, guide sleeve; 24, guide key. DETAILED DESCRIPTION

[0033] The preferred embodiments of the present application will be described in more detail below. Although the preferred embodiments of the present application are described below, it is understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present application is more thoroughly and completely conveyed to those skilled in the art, and the scope of the present application is fully conveyed to those skilled in the art.

[0034] To solve the problems existing in the prior art, the present application provides a machine tool spindle loosening tool driving system, as shown in the accompanying drawings, comprising: Figure 1

[0035] cylinder 12;

[0036] piston 6, one end of the piston 6 is slidably inserted into the cylinder 12, and the other end extends out of the cylinder 12;

[0037] limiting piece 1, the limiting piece 1 is arranged at the other end of the piston 6;

[0038] spring 2, the spring 2 is sleeved on the piston 6 and located between the cylinder 12 and the limiting piece 1;

[0039] sealing assembly, the sealing assembly is sealingly connected between the piston 6 and the cylinder 12;

[0040] loosening tool rod 7, the loosening tool rod 7 axially penetrates the piston 6 and is rotationally connected with the piston 6, one end of the loosening tool rod 7 extends into the machine tool spindle and is connected with the tool assembly, and the other end is used for connecting the pipeline.

[0041] The machine tool spindle loosening tool driving system of the present application is driven by the single-cylinder hydraulic oil cylinder composed of the cylinder 12 and the piston 6 to extend the loosening tool rod 7 towards the machine tool spindle to perform the loosening tool action, the piston 6 end of the hydraulic oil cylinder is extended out of the cylinder 12, and the spring 2 is arranged between the limiting piece 1 at the piston 6 end and the cylinder 12, the retracting action of the loosening tool rod is realized by the restoring force of the spring 2, which is fast, stable and reliable; the piston 6 and the cylinder 12 are sealed by the sealing assembly to prevent the leakage of hydraulic oil. ​

[0042] The following is described in detail with the direction towards the machine tool spindle as front and the direction away from the machine tool spindle as back as an example.

[0043] The machine tool spindle tool loosening driving system further comprises a flange cover 3, the flange cover 3 comprises a flange cover main body and a boss 301 located at one end of the flange cover main body, the flange cover main body is buckled at one end of the cylinder body 12, and the boss 301 is embedded in the cylinder body 12, and the other end of the cylinder body 12 is arranged towards the machine tool spindle;

[0044] The piston 6 comprises a straight cylinder segment and a clamping table 601 connected to the outer wall of one end of the straight cylinder segment, the outer peripheral wall of the clamping table 601 is sealingly connected to the inner wall of the cylinder body 12, the straight cylinder segment passes through the flange cover 3 and is sealingly connected with the flange cover 3, and the tool loosening rod 7 is rotationally connected to the straight cylinder segment through a bearing assembly.

[0045] The cylinder body 12 is a cylinder structure, the flange cover 3 is buckled at the rear end of the cylinder body 12 and is fastened with the cylinder body 12 through bolts or screws, the boss 301 is embedded in the cylinder body 12, and the piston 6 extends out of the flange cover 3, and the extended part cooperates with the limiting piece 1 to provide a restoring force through the spring 2, wherein the boss 301 of the flange cover 3 and the inner wall of the cylinder body 12 adopt an axial hole fit tolerance requirement such as H7 / h6.

[0046] In the present application, an oil inlet is arranged on the side wall of the cylinder body 12 close to the flange cover 3, the oil inlet is communicated with a hydraulic oil circuit through a pipe joint 4, and the clamping table 601 of the piston 6 can move away from the flange cover 3 under the action of the hydraulic oil and drive the tool loosening rod 7 to move synchronously;

[0047] The sealing assembly comprises at least one first sealing piece, a second sealing piece 9 and a third sealing piece 5, the at least one first sealing piece is arranged between the outer peripheral wall of the clamping table 601 and the inner wall of the cylinder body 12, the second sealing piece 9 is arranged between the outer peripheral wall of the straight cylinder segment and the inner wall of the boss 301, and the third sealing piece 5 is arranged between the end face of the flange cover main body and the end face of the cylinder body 12.

[0048] The oil inlet is arranged between the boss 301 of the flange cover 3 and the clamping table 601 of the piston 6 and is communicated with a hydraulic oil source, when the hydraulic oil enters the cylinder body 12 through the oil inlet and is located between the piston 6 and the flange cover 3, the clamping table 601 of the piston 6 is pushed forward under the action of the hydraulic oil and drives the tool loosening rod 7 to move synchronously to loosen the tool.

[0049] In an embodiment of the present application, the first sealing piece is a pair of first and second gaskets 10 and 11 which are parallel to each other, the first and second gaskets 10 and 11 are sleeved between the outer peripheral wall of the clamping table 601 of the piston 6 and the inner peripheral wall of the cylinder body 12;

[0050] And / or,

[0051] The second sealing member 9 is a Teflon seal, and the third sealing member 5 is an O-shaped sealing ring.

[0052] In the present application, the first garter 10 and the second garter 11 are used to achieve double-layer sealing between the piston 6 and the cylinder 12, so as to prevent hydraulic oil from leaking when the piston 6 moves. The first garter 10 and the second garter 11 can be Tacon garters, which can achieve sealing under pressure adjustment. The second sealing member 9 is a Teflon seal, for example, a Tacon Teflon seal can be selected, which is used to achieve sealing between the piston 6 and the flange cover 3 when the piston 6 moves. The third sealing member 5 can be an O-shaped sealing ring, which is used to seal the connection between the end surface of the flange cover 3 and the cylinder 12, and is used to block the hydraulic oil in the cylinder 12. The triple sealing structure can effectively prevent the leakage of hydraulic oil. The Tacon garter and the Teflon seal are both existing products, which have good pressure resistance characteristics. The Teflon seal used between the piston 6 and the cylinder 12 has good adaptability to the pressure between the piston 6 and the cylinder 12, and has good sealing effect. The specific structure is not described in detail.

[0053] In other embodiments of the present application, only one first sealing member can be arranged between the outer peripheral wall of the clamping table 601 of the piston 6 and the inner peripheral wall of the cylinder 12, or three or more first sealing members can be arranged, which is determined according to the process requirements or needs.

[0054] In the present application, the limiting member 1 is annular, the inner wall of the limiting member 1 is provided with a thread, and the limiting member 1 is screwed with the piston 6.

[0055] The limiting member 1 is provided with a tool hole 101 perpendicular to the axial direction, which is used to connect a tightening tool.

[0056] In other embodiments of the present application, the limiting member 1 can also be fixed with the piston 6 by welding, which is determined according to the actual needs, the relative positions of the components, and the convenience of assembly.

[0057] The spring 2 can be a round steel cylindrical compression spring, which is sleeved between the limiting member 1 and the flange cover 3. The outer end surface of the flange cover 3 can be provided with a limiting groove for accommodating the spring 2. The spring 2 extends into the limiting groove. The rear end of the piston 6 is provided with an external thread. The limiting member 1 is provided with a threaded hole. The limiting member 1 can be tightened to the rear end of the piston 6 through the threaded hole with a thread on the inner wall. During assembly, the limiting member 1 can be tightened and fastened with the piston 6 by using a tightening tool according to actual needs. When the limiting member 1 is fastened, a certain pre-compression can be formed on the spring 2, and the spring 2 can be prevented from loosening by being in contact with the top wire 102 of the piston 6 along the radial direction of the limiting member 1. The outer diameter of the rear end of the piston 6 is smaller than the outer diameter of the part sleeved with the spring 2, so that the spring 2 can fully contact with the limiting member 1.

[0058] The rear end of the piston 6 is screwed into the limiting piece 1, the front end of the spring 2 is in contact with the flange cover 3, the rear end of the spring 2 is in contact with the limiting piece 1, the limiting piece 1 is screwed to realize the compression of the spring 2, when the piston 6 moves towards the spindle of the machine tool under the thrust of the hydraulic oil, the spring 2 is compressed, the loosening rod 7 moves synchronously with the piston 6 to loosen the tool, after the loosening is completed, the injection of the hydraulic oil is stopped, and the piston 2 is quickly returned to the original position under the restoring force of the spring 2. The process is stable and reliable.

[0059] In use, the front end of the spindle of the machine tool is usually provided with a disc spring, and the thrust of the hydraulic oil on the piston 6 needs to overcome the counterforce of the disc spring and the spring 2 at the same time, therefore, the pre-compression amount of the spring 2 needs to be moderate, and cannot be too large to affect the thrust of the hydraulic oil on the piston 6, and at the same time, the spring 2 also needs to be able to provide sufficient restoring force to avoid the situation that the restoring is not in place.

[0060] In an embodiment of the present application, the original length of the spring 2 is 100 mm, and the spring 2 is pre-compressed by the limiting piece 1 and the piston 6, and the spring 2 is compressed from the original length of 100 mm to 82 mm during the pre-compression process.

[0061] In the present application, the spindle loosening driving system of the machine tool further comprises a guide sleeve 23 and a guide key 24, the guide sleeve 23 is sleeved on the other end of the loosening rod 7, the inner wall of the straight cylinder section of the piston 6 is provided with a key groove parallel to the axial direction, the guide key 24 is arranged on the guide sleeve 23 in the axial direction and is slidably connected in the key groove. The guide key 24 is guided when sliding through the key groove, and the guide sleeve 23 can move forward and backward under the limiting of the guide key 24.

[0062] The loosening rod 7 comprises a first rod section, a second rod section and a third rod section connected in sequence from front to back and decreasing in diameter, and the guide sleeve 23 is rotationally connected to the third rod section;

[0063] The bearing assembly comprises a spacer sleeve 13, a first bearing 14, a first inner spacer sleeve 16, a second bearing 17, a second inner spacer sleeve 20 and a locking nut 18, which are sleeved in sequence between the third rod section and the guide sleeve 23 away from the cylinder body 12;

[0064] The inner wall of one end of the guide sleeve 23 towards the flange cover 3 is provided with a limiting step for clamping the first bearing 14, the guide sleeve 23 is provided with a first outer spacer sleeve 15 sleeved on the first inner spacer sleeve 16, a second outer spacer sleeve 22 sleeved on the second inner spacer sleeve 20, and an elastic stop ring 21 sleeved on the loosening rod 7 between the second outer spacer sleeve 22 and the locking nut 18.

[0065] The limiting step is used for axially limiting the first bearing 14, the elastic check ring 21 is inlaid in the inner wall of the guide sleeve 23 and is sleeved on the loosening rod 7, the locking nut 18 is used for axially limiting the elastic check ring 21 and the second outer spacer 22, the first bearing 14 and the second bearing 17 can be angular contact bearings, the loosening rod 7 is relatively rotated between the first bearing 14 and the second bearing 17 and the guide sleeve 23, and the axial guidance of the loosening rod 7 is realized by cooperating with the guide key 24.

[0066] The machine tool spindle loosening driving system further comprises an adjusting pad 8, the inner wall of the straight section of the piston 6 is provided with a supporting ring, the second rod section of the loosening rod 7 passes through the supporting ring, and the adjusting pad 8 is connected to one side of the supporting ring towards the machine tool spindle through bolts or screws. The adjusting pad 8 can realize the axial limiting of the piston 6 and the loosening rod 7 pushed by the piston 6.

[0067] During the loosening action, the hydraulic oil enters between the piston 6 and the flange cover 3 through the pipe joint 4, pushes the piston 6 to move, and further pushes the loosening rod 7 to move to realize the loosening after the adjusting pad 8 contacts the loosening rod 7. At the same time, the loosening rod 7 rotates with the spindle when the spindle rotates, and the relative rotation between the piston 6 and the loosening rod 7 is realized through the bearing assembly.

[0068] During assembly, the adjusting pad 8 and the first rod section of the loosening rod 7 are kept a certain distance apart by matching grinding of the adjusting pad 8 to prevent the adjusting pad 8 and the loosening rod 7 from being worn. In an embodiment of the present application, the distance between the adjusting pad 8 and the first rod section of the loosening rod 7 is 2.5-7.5 mm when no oil is injected into the cylinder body 12.

[0069] The loosening rod 7 is provided with a through hole penetrating in the axial direction, the other end of the loosening rod 7 is provided with a rotary joint 19 communicating with the through hole, and the rotary joint 19 is used for connecting the air pipe or the water pipe to ventilate or water the spindle when needed, so as to realize the process requirements such as dust removal and cooling.

[0070] The process of using the machine tool spindle loosening driving system related to the present application is as follows:

[0071] When the driving system is not working, the spring 2 is pre-tightened between the limiting part 1 and the flange cover 3, and at this time, the piston 6 and the loosening rod 7 are located at the rear end preset position;

[0072] When the hydraulic oil is injected into the cylinder body 12 through the oil inlet, the piston 6 moves forward under the action of the hydraulic oil, the spring 2 is pressed, the piston 6 moves to the position where the adjusting pad 8 contacts the loosening rod 7 and pushes the loosening rod 7 to move forward, the guide sleeve 23 slides along the key groove through the guide key 24, at this time, the loosening rod 7 rotates synchronously with the spindle and relatively rotates between the bearing assembly and the guide sleeve 23, when the loosening rod 7 moves to the front end preset position to perform the loosening action, at this time, the hydraulic oil injection is stopped, and the hydraulic oil maintains a certain pressure;

[0073] When the loosening lever 7 needs to be retracted, the pressure of the hydraulic oil is released, the limiting piece 1 connected with the rear end of the piston 6 drives the piston 6 to reset under the restoring force of the spring 2, and the loosening lever 7 is synchronously reset under the cooperation of the guide key 24 and the key groove, so that the whole loosening and retracting process is stable and reliable.

[0074] Embodiments of the application have been described above, with the understanding that these descriptions are exemplary only, and are not intended to be exhaustive or to limit the embodiments disclosed to the precise details of the description. Changes and modifications can be made to the described embodiments by those of ordinary skill in the art, without departing from the scope and spirit of the described embodiments.

Claims

1. A machine tool spindle tool release drive system, characterized by, The utility model relates to a kind of hydraulic tool holder, including: Cylinder (12); Piston (6), one end of the piston (6) is slidably inserted into the cylinder (12), the other end extends out of the cylinder (12); Limiting piece (1), the limiting piece (1) is provided at the other end of the piston (6); Spring (2), the spring (2) is sleeved on the piston (6), and is located between the cylinder (12) and the limiting piece (1); Sealing assembly, the sealing assembly is sealed between the piston (6) and the cylinder (12); Loosen the sword bar (7), the sword bar (7) is axially through the piston (6) and is rotatably connected with the piston (6), one end of the sword bar (7) extends into machine tool spindle and is connected to tool assembly, the other end is used for connecting pipeline; It further includes flange cover (3), the flange cover (3) includes flange cover main body and boss (301) at one end of the flange cover main body, the flange cover main body is buckled at one end of the cylinder (12), and the boss (301) is embedded in the cylinder (12), the other end of the cylinder (12) is arranged towards the machine tool spindle; The piston (6) includes straight cylinder section and clamping table (601) connected to the outer wall of one end of the straight cylinder section, the outer peripheral wall of the clamping table (601) is sealingly connected to the inner wall of the cylinder (12), the straight cylinder section passes through the flange cover (3) and is sealingly connected with the flange cover (3), the sword bar (7) is rotatably connected to the straight cylinder section through bearing assembly; The side wall of the cylinder (12) is provided with an oil inlet near the flange cover (3), the oil inlet is communicated with hydraulic oil circuit through pipe joint (4), the clamping table (601) of the piston (6) can move away from the flange cover (3) under the action of hydraulic oil, and drive the sword bar (7) to move synchronously; The sealing assembly includes at least one first sealing element, second sealing element (9) and third sealing element (5), at least one first sealing element is arranged between the outer peripheral wall of the clamping table (601) and the inner wall of the cylinder (12), the second sealing element (9) is arranged between the outer peripheral wall of the straight cylinder section and the inner wall of the boss (301), and the third sealing element (5) is arranged between the end face of the flange cover main body and the end face of the cylinder (12);It further includes guide sleeve (23) and guide key (24), the guide sleeve (23) is sleeved on the other end of the sword bar (7), the inner wall of the straight cylinder section of the piston (6) is provided with key groove parallel to the axial direction, the guide key (24) is arranged on the guide sleeve (23) in the axial direction and is slidingly connected in the key groove; The sword bar (7) includes first rod section, second rod section and third rod section connected in sequence and decreasing in diameter, the guide sleeve (23) is rotatably connected to the third rod section. The bearing assembly comprises, in sequence from the direction away from the cylinder body (12), a spacer sleeve (13), a first bearing (14), a first inner spacer sleeve (16), a second bearing (17), a second inner spacer sleeve (20) and a locking nut (18) sleeved between the third rod section and the guide sleeve (23). Further comprising an adjusting pad (8), an inner wall of the straight section of the piston (6) is provided with a support ring, the second rod section of the loosening tool rod (7) passes through the support ring, and the adjusting pad (8) is connected to one side of the support ring facing the machine tool spindle.

2. A machine tool spindle tool release drive system according to claim 1, characterised in that, The first seal is a pair of first and second gaskets (10) and (11) parallel to each other. And / or, The second seal (9) is a stellite seal.

3. The machine tool spindle tool release drive system according to claim 1, wherein, The limiting member (1) is annular, the inner wall of the limiting member (1) is provided with threads, and the limiting member (1) is threadedly connected with the piston (6). The limiting member (1) is provided with a tool hole (101) perpendicular to the axial direction, used for connecting a tightening tool.

4. The machine tool spindle loosening tool driving system according to claim 1, characterized in that, An inner wall of one end of the guide sleeve (23) facing the flange cover (3) is provided with a limiting step for clamping the first bearing (14), the guide sleeve (23) is provided with a first outer spacer sleeve (15) sleeved on the first inner spacer sleeve (16), a second outer spacer sleeve (22) sleeved on the second inner spacer sleeve (20), and an elastic retainer ring (21) sleeved on the loosening tool rod (7) between the second outer spacer sleeve (22) and the locking nut (18).

5. The machine tool spindle tool release drive system according to claim 1, wherein, The distance between the adjusting pad (8) and the first rod section of the loosening tool rod (7) is 2.5-7.5mm when no oil is injected into the cylinder body (12).

6. The machine tool spindle tool release drive system according to claim 1, wherein, The loosening tool rod (7) is provided with a through hole penetrating in the axial direction, the other end of the loosening tool rod (7) is provided with a rotary joint (19) communicating with the through hole, and the rotary joint (19) is used for communicating an air pipe or a water pipe.

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