An internal hydraulic automatic tool change system for the tool magazine of a machining center

Abstract

The present invention provides a built-in hydraulic automatic tool change system for a machining center tool magazine, including an oil distribution block. There are 4 oil circuit holes opened at the lower left side of the oil distribution block, and an installation hole is opened in the middle of the oil distribution block. An output shaft is installed in the installation hole. A piston rod is installed in the output shaft through a sealing ring. The left end of the piston rod is fixed with an output shaft rear plug through a bolt. A signal induction coil is fixedly sleeved outside the output shaft rear plug. An oil cylinder assembly is installed on the right side of the oil distribution block. The oil cylinder assembly is sleeved outside the output shaft. An oil cylinder end cover is fixed by threads on the right side of the oil cylinder assembly. A guide groove is opened on the side surface of the output shaft. A tool arm is installed outside the output shaft. A guide cylinder is fixed on the right side of the tool arm. The guide cylinder is movably installed outside the output shaft. An output shaft front plug is installed at the right end of the output shaft. A guide cylinder end cover is fixed at the right end of the guide cylinder; this device is provided with a hydraulic automatic tool change system, which has a simple and compact structure, occupies a small space and is easy to protect, is easy to be processed and obtained, can be adapted to machine tools with short nose end spindles on the market, and has a wide application range.

Description

Technical Field

[0001] The invention belongs to the technical field of tool changing manipulator equipment for tool magazines, and in particular relates to a built-in hydraulic automatic tool changing system for tool magazines in machining centers. Background Art

[0002] The automatic tool changing system refers to a processing device that realizes the tool changing requirements for continuous processing between parts processes. The automatic tool changing system consists of a tool magazine and a tool changing device; among them, there are three main types of automatic tool changing systems that are most widely used, namely, turret tool changing system, spindle direct tool changing system with disc tool magazine and tool changing robot tool changing system with chain tool magazine. The automatic tool changing system usually consists of two parts: a tool magazine and a tool changing robot.

[0003] According to different implementation principles, the automatic tool changing of tool changing robots includes rotating tool holder tool changing, replacing spindle head tool changing, automatic tool changing with tool magazine, etc.; the working principle of rotating tool holder tool changing is similar to that of indexing table, and the exchange of old and new tools is achieved by rotating the tool holder at a fixed angle; when replacing the spindle head tool changing method, the tool is first placed on each spindle head, and the spindle head is replaced by rotating the turret to achieve the purpose of replacing the tool; these two methods are simple in design, short in tool changing time, and high in reliability. Their disadvantages are that the number of reserve tools is limited, especially the spindle system of the spindle head tool changing method has poor rigidity, so it is only suitable for machine tools with fewer processes and less high precision requirements; and the existing automatic tool changing robot usually clamps the robot on one side of the spindle box, and drives the operation to change tools through the spindle box. The conventional spindle box is used with machine tools, has a cumbersome structure, a large size, occupies a large space, has high processing and production costs, and is not easy to protect. Summary of the invention

[0004] The present invention aims to solve the technical problems raised by the above background technology, and provides a built-in hydraulic automatic tool changing system for a tool magazine of a machining center.

[0005] The technical solution adopted by the present invention to solve the technical problem is:

[0006] A built-in hydraulic automatic tool changing system for a tool magazine in a machining center, comprising an oil distributor, four oil passage holes are opened at the lower left side of the oil distributor, hose direct joints are installed in the four oil passage holes, a mounting hole is opened in the middle of the oil distributor, an output shaft is installed in the mounting hole, a piston rod is installed in the output shaft through a sealing ring, the left end of the piston rod is fixed with an output shaft rear plug by bolts, a signal sensing coil is movably sleeved on the outer side of the output shaft rear plug, a signal protection cover is threadedly fixed on the left side of the oil distributor, a cylinder assembly is installed on the right side of the oil distributor, and the cylinder assembly is sleeved on the output shaft On the outside, a cylinder end cover is threadedly fixed to the right side of the cylinder assembly, a guide groove is opened on the side of the output shaft, a bearing is movably installed in the guide groove, a knife arm is movably installed on the outside of the output shaft through the guide groove and the bearing, the knife arm is telescoped and rotated on the outside of the output shaft through the cylinder assembly, a guide sleeve is fixed on the right side of the knife arm, the guide sleeve is movably installed on the outside of the output shaft, an output shaft front plug is installed on the right end of the output shaft, the output shaft front plug is sleeved on the outside of the piston rod, a guide sleeve end cover is fixed to the right end of the guide sleeve, and the right end of the piston rod is threaded through the guide sleeve end cover and is connected with a nut and a locking cap.

[0007] Preferably, the cylinder assembly includes a cylinder spacer ring, a dynamic oil ring, a dynamic ring oil seal, a fixed oil ring and a fixed ring oil seal. The cylinder spacer ring is threadedly fixed between the oil distributor seat and the cylinder end cover. An oil groove is opened on the left side of the cylinder spacer ring. The fixed oil ring is fixedly installed on the inner half of the oil groove by an elastic cylindrical pin on the side of the cylinder spacer ring. The fixed ring oil seal is fixedly clamped at the fixed oil ring. The dynamic oil ring is movably installed in the other half of the oil groove. The dynamic oil ring is fixed to the side of the output shaft. The dynamic ring oil seal is clamped on the dynamic oil ring. The dynamic oil ring and the fixed oil ring are installed in coordination.

[0008] Preferably, the four oil circuit holes include a rotating oil inlet, a rotating oil return port, a telescopic oil inlet and a telescopic oil return hole. The rotating oil inlet and the rotating oil return port are respectively connected to both sides of the moving oil ring to form a knife arm rotating oil circuit. The telescopic oil inlet and the telescopic oil return port are respectively connected to between the output shaft and the piston rod to form a knife arm telescopic oil circuit.

[0009] Preferably, a signal connection protrusion is provided on one side of the inner wall of the signal sensing coil, a connection groove matching the signal connection protrusion is provided on one side of the rear plug of the output shaft, the signal connection protrusion is embedded in the connection groove, the right end of the output shaft passes through to the left end and a first signal hole is axially opened, a first signal rod group is installed between one side of the right end of the output shaft and the front plug of the output shaft, the first signal rod group includes a long signal rod, a connecting block, a short signal rod and a first proximity switch, the left side of the long signal rod passes through the first signal hole and is fixedly inserted in the signal connection protrusion, the right side of the long signal rod group is fixedly connected to the right side of the short signal rod through the connecting block, the left side of the short signal rod passes through the right side of the output shaft and extends to the right part of the guide groove, and the first proximity switch is inserted in the side of the signal protection cover and is electrically connected to the signal sensing coil.

[0010] Preferably, a second signal rod group is also installed on the left rear side of the oil separator seat, and the second signal rod group includes a signal protection block, a signal guide sleeve, a compression spring, a movable signal rod and a second proximity switch. The signal protection block is threadedly fixed to the left side of the oil separator seat, and a second signal hole is penetrated through the signal protection block on the left side of the oil separator seat. The left section of the movable signal rod is movably installed in the second signal hole through the signal guide sleeve and the compression spring, and the right side of the movable signal rod passes through the cylinder spacer ring and the cylinder end cover and extends to the right surface of the cylinder end cover. The second proximity switch is inserted from the lower end of the signal protection block to the second signal hole and is electrically connected to the movable signal rod.

[0011] Preferably, a muffler is installed on the right side of the guide tube end cover.

[0012] Preferably, return springs are embedded and installed at the long signal rod and the short signal rod on the left side of the front plug of the output shaft, and the two return springs correspond to the positions of the long signal rod and the short signal rod respectively.

[0013] Preferably, the oil distributor seat, the oil cylinder spacer ring and the inner ring of the oil cylinder end cover are all embedded with a plurality of Gly rings.

[0014] Preferably, the bearing is a curved roller bearing.

[0015] Preferably, a sealing ring is also sleeved on the outer side of the piston rod fixing section.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. This device is equipped with a hydraulic tool-changing manipulator, which connects the hydraulic oil circuit and the tool arm into a whole. It has a simple and compact structure, occupies a small space, is easy to process, and can be adapted to machine tools with short nose spindles on the market, with a wide range of applications.

[0018] 2. The device is provided with a first signal rod group and a second signal rod group to realize tool position detection when the tool arm is extended and retracted, thereby ensuring that the tool arm is extended and retracted to the correct position, and the tool is accurately replaced, which greatly reduces the error in tool change and affects the processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 A front view of the present invention;

[0021] Figure 2 An exploded view of an embodiment of the present invention;

[0022] Figure 3 A half-section view of an embodiment of the present invention;

[0023] The embodiment of the present invention mainly includes the following component symbols:

[0024] Oil distributor seat-1, oil passage hole-101, hose straight connector-102, mounting hole-103, second signal hole-104, output shaft-2, guide groove-201, first signal hole-202, piston rod-3, sealing ring-301, output shaft rear plug-4, connecting groove-401, signal induction ring-5, signal connection protrusion-501, signal protection cover-6, cylinder assembly-7, cylinder spacer ring-701, dynamic oil ring-702, dynamic ring oil seal-703, fixed oil ring-704, fixed ring oil seal-705, elastic cylindrical pin-706, cylinder end cover-8 , knife arm-9, bearing-901, guide cylinder-10, first signal rod group-11, long signal rod-1101, connecting block-1102, short signal rod-1103, first proximity switch-1104, return spring-1105, output shaft front plug-12, second signal rod group-13, signal protection block-1301, signal guide sleeve-1302, compression spring-1303, movable signal rod-1304, second proximity switch-1305, guide cylinder end cover-14, muffler-1401, nut-15, locking cap-16, grid ring-17. DETAILED DESCRIPTION

[0025] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0026] Example 1

[0027] like Figures 1 to 3As shown, a built-in hydraulic automatic tool changing system for a tool magazine of a machining center comprises an oil distributor 1, four oil passage holes 101 are opened at the lower left side of the oil distributor 1, and hose direct connectors 102 are installed in the four oil passage holes 101, a mounting hole 103 is opened in the middle of the oil distributor 1, an output shaft 2 is installed in the mounting hole 103, a piston rod 3 is installed in the output shaft 2 through a sealing ring 301, an output shaft rear plug 4 is fixed to the left end of the piston rod 3, a signal sensing coil 5 is movably sleeved on the outer side of the output shaft rear plug 4, a signal protection cover 6 is threadedly fixed on the left side of the oil distributor 1, a cylinder assembly 7 is installed on the right side of the oil distributor 1, and the cylinder assembly 7 is sleeved on the outer side of the output shaft 2. A cylinder end cover 8 is threadedly fixed to the right side of the component 7, a guide groove 201 is opened on the side of the output shaft 2, a bearing 901 is movably installed in the guide groove 201, a knife arm 9 is movably installed on the outside of the output shaft 2 through the guide groove 201 and the bearing 901, the knife arm 9 is telescoped and rotated on the outside of the output shaft 2 through the cylinder component 7, a guide sleeve 10 is fixed to the right side of the knife arm 9, the guide sleeve 10 is movably installed on the outside of the output shaft 2, an output shaft front plug 12 is installed at the right end of the output shaft 2, the output shaft front plug 12 is sleeved on the outside of the piston rod 3, a guide sleeve end cover 14 is fixed to the right end of the guide sleeve 10, and the right end of the piston rod 3 is threaded through the guide sleeve end cover 14 and is connected with a nut 15 and a locking cap 16.

[0028] The device is provided with a hydraulic automatic tool changing system, which connects the hydraulic oil circuit and the tool arm 9 into a whole, has a simple and compact structure, occupies a small space, is easy to process, can be adapted to machine tools with short nose spindles on the market, and has a wide range of applications.

[0029] The cylinder assembly 7 includes a cylinder spacer ring 701, a dynamic oil ring 702, a dynamic ring oil seal 703, a fixed oil ring 704 and a fixed ring oil seal 705. The cylinder spacer ring 701 is threadedly fixed between the oil distributor seat 1 and the cylinder end cover 8. An oil groove is opened on the left side of the cylinder spacer ring 701. The fixed oil ring 704 is fixedly installed on the inner half of the oil groove by an elastic cylindrical pin 706 on the side of the cylinder spacer ring 701. The fixed ring oil seal 705 is fixedly clamped on the fixed oil ring 704. The dynamic oil ring 702 is movably installed on the other half of the oil groove. The dynamic oil ring 702 is fixed on the side of the output shaft 2. The dynamic ring oil seal 703 is clamped on the dynamic oil ring 702. The dynamic oil ring 702 and the fixed oil ring 704 are installed in coordination.

[0030] The four oil circuit holes 101 include a rotating oil inlet, a rotating oil return port, a telescopic oil inlet and a telescopic oil return hole. The rotating oil inlet and the rotating oil return port are respectively connected to both sides of the movable oil ring 702 to form a rotating oil circuit for the knife arm 9. The telescopic oil inlet and the telescopic oil return port are respectively connected to between the output shaft 2 and the piston rod 3 to form a telescopic oil circuit for the knife arm 9.

[0031] A signal connection protrusion 501 is provided on one side of the inner wall of the signal induction coil 5, a connection groove 401 matching the signal connection protrusion 501 is provided on one side of the output shaft rear plug 4, and the signal connection protrusion 501 is embedded in the connection groove 401. A first signal hole 202 is axially opened from the right end of the output shaft 2 to the left end, and a first signal rod group 11 is installed between one side of the right end of the output shaft 2 and the output shaft front plug 12. The first signal rod group 11 includes a long signal rod 1101, a connection block 1 102, a short signal rod 1103 and a first proximity switch 1104, the left side of the long signal rod 1101 passes through the first signal hole 202 and is fixedly inserted into the signal connection protrusion 501, the right side of the long signal rod 1101 group is fixedly connected to the right side of the short signal rod 1103 through the connecting block 1102, the left side of the short signal rod 1103 passes through the right side of the output shaft 2 and extends to the right part of the guide groove 201, the first proximity switch 1104 is inserted in the side of the signal protection cover 6 and is electrically connected to the signal induction coil 5.

[0032] A second signal rod group 13 is also installed on the left rear side of the oil separator seat 1, and the second signal rod group 13 includes a signal protection block 1301, a signal guide sleeve 1302, a compression spring 1303, a movable signal rod 1304 and a second proximity switch 1305. The signal protection block 1301 is threadedly fixed on the left side of the oil separator seat 1, and a second signal hole 104 is penetrated through the signal protection block 1301 on the left side of the oil separator seat 1. The left section of the movable signal rod 1304 is movably installed in the second signal hole 104 through the signal guide sleeve 1302 and the compression spring 1303. The right side of the movable signal rod 1304 passes through the cylinder spacer ring 701 and the cylinder end cover 8 and extends to the right surface of the cylinder end cover 8. The second proximity switch 1305 is inserted from the lower end of the signal protection block 1301 to the second signal hole 104 and is electrically connected to the movable signal rod 1304.

[0033] The device is provided with a first signal rod group 11 and a second signal rod group 13 to realize tool position detection when the tool arm 9 is extended and retracted, thereby ensuring that the tool arm 9 is extended and retracted to the correct position, and tools are accurately replaced, which greatly reduces errors in tool change and affects processing efficiency.

[0034] A muffler 1401 is installed on the right side of the guide tube end cover 14 to eliminate the noise generated when the knife arm 9 rotates and retracts.

[0035] Reset springs 1105 are embedded and installed at the long signal rod 1101 and the short signal rod 1103 on the left side of the output shaft front plug 12. The two reset springs 1105 correspond to the positions of the long signal rod 1101 and the short signal rod 1103 respectively, and are used to move the knife arm 9 to the right to compress the long signal rod 1101, so that the signal sensing coil 5 moves forward to sense the first proximity switch 1104.

[0036] The oil distributor seat 1, the cylinder spacer ring 701 and the inner ring of the cylinder end cover 8 are all embedded with a plurality of grid rings 17; the outer side of the fixed section of the piston rod 3 is also covered with a sealing ring 301; O-rings are installed between the cylinder end cover 8, the cylinder spacer ring 701 and the oil distributor seat 1 to ensure the hydraulic sealing of the rotation of the knife arm 9, and the cylinder end cover 8, the cylinder spacer ring 701 and the oil distributor seat 1 are sealed with grid rings 17 as well as the output shaft. The grid rings 17 and the sealing rings 301 effectively ensure the sealing of the piston rod 3 and the output shaft 2, and ensure the normal operation of the hydraulic oil without leakage.

[0037] The bearing 901 is a curved roller bearing.

[0038] Working principle of this device:

[0039] When the knife arm 9 rotates, hydraulic oil is passed through the rotating oil inlet, and the oil hole on one side of the movable oil ring 702 passes oil to drive the movable oil ring 702 to rotate, thereby driving the output shaft 2 to rotate, and the output shaft 2 drives the knife arm 9 to complete the rotation; when rotating, oil is passed through the rotating oil return port, and the oil hole on the other side of the movable oil ring 702 passes oil to drive the movable oil ring 702 to rotate, thereby driving the output shaft 2 to rotate, and the output shaft 2 drives the knife arm 9 to complete the rotation;

[0040] When the knife arm 9 is telescopic, hydraulic oil is passed through the telescopic oil inlet, and oil is passed through the piston of the piston rod 3 to drive the telescopic rod to extend, and the telescopic rod drives the output shaft 2 to extend, and the output shaft 2 drives the knife arm 9 to extend, and the bearing on which the knife arm 9 is installed touches the short signal rod 1103 of the first signal rod group 11, and the long signal rod 1101 and the short signal rod 1103 compress the reset spring 1105, and the output shaft 2 drives the signal sensing coil 5 to extend to the right, and the first proximity switch 1104 senses the signal sensing coil 5 and gets energized, that is, it is detected that the knife arm 9 is extended to the full extent, and the knife arm 9 is extended; when retracting, hydraulic oil is passed through the telescopic oil return port, and the telescopic rod of the piston rod 3 is pushed to retract, driving the output shaft 2 to retract, and the signal sensing coil 5 at the left end of the output shaft 2 is reset to touch the first proximity switch 1104 of the first signal rod group 11, then the output shaft 2 is reset, and the left side of the knife arm 9 touches the second proximity switch 1305 of the second signal rod group 13, then the knife arm 9 is reset, and the knife arm 9 is retracted.

[0041] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An internal hydraulic automatic tool changing system for a tool magazine of a machining center, characterized in that: It includes an oil distribution seat (1). Four oil circuit holes (101) are opened below the left side of the oil distribution seat (1). Hose nipples (102) are installed in all four oil circuit holes (101). An installation hole (103) is opened in the middle of the oil distribution seat (1). A power output shaft (2) is installed in the installation hole (103). A piston rod (3) is installed in the power output shaft (2) through a sealing ring (301). The left end of the piston rod (3) is fixed with a power output shaft rear plug (4) by bolts. A signal induction ring (5) is movably sleeved outside the power output shaft rear plug (4). A signal protection cover (6) is fixed to the left side of the oil distribution seat (1) by threads. An oil cylinder assembly (7) is installed on the right side of the oil distribution seat (1). The oil cylinder assembly (7) is sleeved outside the power output shaft (2). An oil cylinder end cover (8) is fixed to the right side of the oil cylinder assembly (7) by threads. A guide groove (201) is opened on the side of the power output shaft (2). A bearing (901) is movably installed in the guide groove (201). A tool arm (9) is movably installed outside the power output shaft (2) through the guide groove (201) and the bearing (901). The tool arm (9) expands, contracts and rotates outside the power output shaft (2) through the oil cylinder assembly (7). A guide cylinder (10) is fixed to the right side of the tool arm (9). The guide cylinder (10) is movably installed outside the power output shaft (2). A power output shaft front plug (12) is installed at the right end of the power output shaft (2). The power output shaft front plug (12) is sleeved outside the piston rod (3). A guide cylinder end cover (14) is fixed to the right end of the guide cylinder (10). The right end of the piston rod (3) is threaded through the guide cylinder end cover (14) and connected with a nut (15) and a locking cap (16); The oil cylinder assembly (7) includes an oil cylinder spacer ring (701), a moving oil ring (702), a moving ring oil seal (703), a fixed oil ring (704) and a fixed ring oil seal (705). The oil cylinder spacer ring (701) is fixed between the oil distribution seat (1) and the oil cylinder end cover (8) by threads. An oil groove is opened on the left side of the oil cylinder spacer ring (701). The fixed oil ring (704) is fixedly installed in the inner half of the oil groove through an elastic cylindrical pin (706) on the side of the oil cylinder spacer ring (701). The fixed ring oil seal (705) is fixedly clamped at the fixed oil ring (704). The moving oil ring (702) is movably installed in the other half of the oil groove. The moving oil ring (702) is fixed to the side of the power output shaft (2). The moving ring oil seal (703) is clamped on the moving oil ring (702). The moving oil ring (702) and the fixed oil ring (704) are installed in cooperation.

2. The hydraulic automatic tool changing system according to claim 1, characterized in that: The four oil circuit holes (101) include a rotary oil inlet, a rotary oil return port, a telescopic oil inlet and a telescopic oil return hole. The rotary oil inlet and the rotary oil return port are respectively connected to both sides of the moving oil ring (702) to form a rotary oil circuit for the tool arm (9). The telescopic oil inlet and the telescopic oil return port are respectively connected between the power output shaft (2) and the piston rod (3) to form a telescopic oil circuit for the tool arm (9).

3. The hydraulic automatic tool changing system according to claim 2, characterized in that: On one side of the inner wall of the signal induction coil (5), there is a signal connection protrusion (501). On one side of the rear plug of the output shaft (4), there is a connection groove (401) that cooperates with the signal connection protrusion (501). The signal connection protrusion (501) is embedded in the connection groove (401). An axial first signal hole (202) is opened from the right end to the left end of the output shaft (2). Between the right side of the output shaft (2) and the front plug of the output shaft (12), a first signal rod group (11) is installed. The first signal rod group (11) includes a long signal rod (1101), a connection block (1102), a short signal rod (1103), and a first proximity switch (1104). The left side of the long signal rod (1101) passes through the first signal hole (202) and is fixedly inserted into the signal connection protrusion (501). The right side of the long signal rod (1101) group is fixedly connected to the right side of the short signal rod (1103) through the connection block (1102). The left side of the short signal rod (1103) passes through the right side of the output shaft (2) and extends to the right part of the guide groove (201). The first proximity switch (1104) is inserted into the side of the signal protection cover (6) and is electrically connected to the signal induction coil (5).

4. The hydraulic automatic tool changing system according to claim 3, characterized in that: On the left rear side of the oil distribution seat (1), a second signal rod group (13) is further installed. The second signal rod group (13) includes a signal protection block (1301), a signal guide sleeve (1302), a compression spring (1303), a movable signal rod (1304), and a second proximity switch (1305). The signal protection block (1301) is threadedly fixed on the left side of the oil distribution seat (1). A second signal hole (104) is opened through the left side of the oil distribution seat (1) at the position of the signal protection block (1301). The left section of the movable signal rod (1304) is movably installed in the second signal hole (104) through the signal guide sleeve (1302) and the compression spring (1303). The right side of the movable signal rod (1304) passes through the oil cylinder spacer ring (701) and the oil cylinder end cover (8) and extends to the right surface of the oil cylinder end cover (8). The second proximity switch (1305) is inserted from the lower end of the signal protection block (1301) to the second signal hole (104) and is electrically connected to the movable signal rod (1304).

5. The hydraulic automatic tool changing system according to claim 4, characterized in that: A muffler (1401) is installed on the right side of the guide cylinder end cover (14).

6. The hydraulic automatic tool changing system according to claim 5, characterized in that: On the left side of the front plug of the output shaft (12), reset springs (1105) are embedded at the positions of the long signal rod (1101) and the short signal rod (1103). The two reset springs (1105) correspond to the positions of the long signal rod (1101) and the short signal rod (1103) respectively.

7. The hydraulic automatic tool changing system according to claim 6, characterized in that: A plurality of Gleason rings (17) are embedded and installed in the inner rings of the oil distribution seat (1), the oil cylinder spacer ring (701), and the oil cylinder end cover (8).

8. The hydraulic automatic tool changing system according to claim 7, characterized in that: A sealing ring (301) is also sleeved on the outer side of the fixed section of the piston rod (3).

9. The hydraulic automatic tool changing system according to claim 8, characterized in that: The bearing (901) is a curved roller bearing.

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