A hydraulic four-jaw double-acting centering chuck

Abstract

The present invention relates to a hydraulic four-jaw double-acting centering chuck, comprising a disc body, a clamping jaw, a sliding seat, a T-block, a wedge core sleeve 1 and a wedge core sleeve 2, the sliding seat is slidably mounted on the disc body, the clamping jaw is indirectly fixed on the sliding seat through the T-block, the opposing clamping jaws of the four clamping jaws form a group of two, the wedge core sleeve 1 and the wedge core sleeve 2 are installed inside the disc body, a cylindrical cavity is provided inside the disc body, the wedge core sleeve 1 is slidably mounted in the cylindrical cavity after being wedge-shaped with one group of clamping jaws, a square cavity is provided at the upper end of the wedge core sleeve 1, the wedge core sleeve 2 is slidably mounted in the square cavity after being wedge-shaped with another group of clamping jaws, and a double-acting oil cylinder on the same side is installed on a lathe, which independently pulls the wedge core sleeve 1 and the wedge core sleeve 2 respectively, and moves the two groups of clamping jaws opposite to each other to clamp a square workpiece. The two groups of clamping jaws of the present invention form a double-acting effect, and clamp from the sides of the breaker cylinder body respectively, which reduces the requirements for the operator to adjust the position of the clamping jaws, and can increase the service life of the oil cylinder at the same time.

Description

Technical Field

[0001] The invention relates to the technical field of tooling fixtures, and in particular to a hydraulic four-jaw double-acting centering chuck. Background Art

[0002] A breaker hammer is a kind of engineering machinery commonly used in construction. The shape of the breaker hammer cylinder is a rectangular parallelepiped, and an inner hole that needs to be processed is provided inside, and the center of the inner hole is eccentric to the center of the rectangular parallelepiped.

[0003] At present, the processing of the eccentric inner hole on the breaker cylinder in my country generally adopts a four-jaw self-centering hydraulic chuck to clamp from the four sides of the cylinder. Since the breaker cylinder is a rectangular block and the processed inner hole is located at the eccentric position of the cylinder, the operator needs to adjust the positions of the four jaws according to the size of the workpiece, and further needs to add pads to the jaws to adapt to the eccentric position of the processed inner hole. This places high requirements on the operator and takes a long time to operate, resulting in low work efficiency.

[0004] Usually, the cylinder height of the breaker is relatively high, and a relatively large clamping force is required for the clamping of the claws. A chuck is usually provided with the clamping force of the claws by a cylinder. To increase the clamping force, the cylinder pressure must be increased. Due to the influence of the cylinder itself, the cylinder pressure is limited, and the increased pressure is limited, resulting in poor clamping effect of the claws. Summary of the invention

[0005] In view of the deficiencies in the prior art in processing the eccentric hole on the breaker cylinder body, firstly, when the jaws clamp the breaker cylinder body, the adjustment of the jaws is complicated, the operation time is long, the requirements on the operator are high, and the work efficiency is low; secondly, the clamping force of the jaws is difficult to increase and the clamping effect is poor. The present invention provides a hydraulic four-jaw double-centering chuck, which can independently control the movement of two groups of opposing jaws to form a double-action effect, and clamp from the sides of the breaker cylinder body respectively, thereby reducing the time for the operator to adjust the jaws, and also reduces the requirements on the operator, and greatly improves the work efficiency. At the same time, the double-action cylinder pulls the two groups of jaws to move independently to clamp the breaker cylinder body, and the clamping force of the chuck is doubled. Compared with the traditional hydraulic four-jaw chuck, the double-action cylinder can achieve a stable clamping effect by maintaining a normal pressure. There is no need to increase the cylinder pressure, and the service life of the cylinder is greatly increased.

[0006] One of the above-mentioned invention objects of the present invention is achieved through the following technical solutions:

[0007] A hydraulic four-jaw double-acting centering chuck comprises a disc body, a clamping jaw, a sliding seat, a T-block, a wedge core sleeve 1 and a wedge core sleeve 2, characterized in that: a slide groove is arranged on the upper end surface of the disc body, the sliding seat is slidably arranged inside the slide groove, a comb tooth 1 is arranged on the upper end surface of the sliding seat, a comb tooth 2 is arranged on the lower end surface of the clamping jaw, the clamping jaw is indirectly fixed to the sliding seat through the T-block, the comb tooth 1 and the comb tooth 2 are meshed, the clamping jaw comprises a first clamping jaw, a second clamping jaw, a third clamping jaw and a fourth clamping jaw, the first clamping jaw and the third clamping jaw are arranged oppositely, the second clamping jaw and the fourth clamping jaw are arranged oppositely, a cylindrical cavity is opened inside the disc body, an oblique wedge-shaped T-shaped groove 1 is arranged at both ends of the wedge core sleeve 1, the inner ends of the first clamping jaw and the third clamping jaw are both An inclined wedge-shaped T-key is provided, and a wedge core sleeve is slidably installed in a cylindrical cavity by cooperation of a T-groove and a T-key. A square cavity is opened at the upper end of the wedge core sleeve, and the upper end of the wedge core sleeve is located inside the square cavity. The lower end of the wedge core sleeve is correspondingly inserted into the central long hole of the wedge core sleeve. Two inclined wedge-shaped T-grooves are provided at both ends of the wedge core sleeve, and the inner ends of the second clamping jaw and the fourth clamping jaw are both provided with an inclined wedge-shaped T-key. The wedge core sleeve is slidably installed in the wedge core sleeve by cooperation of a T-groove and a T-key. A power cylinder is installed on the lathe, and the power cylinder independently pulls the wedge core sleeve and the wedge core sleeve, respectively, and independently drives the two opposite groups of clamping jaws to move.

[0008] Two opposing jaws among the four jaws each form a group, the first jaw and the third jaw form a group, and the second jaw and the fourth jaw form a group. Through the wedge core sleeve 1 and the wedge core sleeve 2, the two groups of jaws are independently pushed to move and clamp the workpiece, forming a double-action effect. When processing the eccentric hole on the damaged hammer cylinder body, the position of the jaws is convenient and simple to adjust, which reduces the requirements for the operator, shortens the adjustment time, and greatly improves the work efficiency. At the same time, the clamping effect is good, and the breaker hammer cylinder body can be stably clamped.

[0009] Preferably, the power cylinder is a double-acting cylinder on the same side, including a large piston rod and a small piston rod, the piston parts of the large piston rod and the small piston rod are movably installed in the cylinder body cavity of the double-acting cylinder, the upper end of the small piston rod extends into the central long hole 1 of the wedge core sleeve 1, the upper end of the small piston rod and the lower end of the wedge core sleeve 2 are connected and fixed by the same long bolt, the upper end of the large piston rod is threadedly connected to the lower end of the wedge core sleeve 1 to pull the wedge core sleeve 1, and the double-acting cylinder pulls the two groups of claws to move independently to clamp the breaker cylinder body, and the clamping force of the chuck is doubled. Compared with the traditional hydraulic four-jaw chuck, the double-acting cylinder can achieve a stable clamping effect by maintaining normal pressure, and there is no need to increase the cylinder pressure, and the service life of the cylinder is greatly increased.

[0010] Preferably, the height of the upper end of the wedge core sleeve 2 is smaller than the depth of the square cavity, and a sliding space is formed between the upper bottom surface of the wedge core sleeve 2 and the bottom surface of the square cavity, so that a gap is left between the upper bottom surface of the wedge core sleeve 2 and the bottom surface of the square cavity, forming a sliding space, so that the wedge core sleeve 2 always slides along the side of the square cavity, thereby enhancing stability during sliding.

[0011] Preferably, a dust cover is provided on the disk body, and the dust cover is located at the center of the upper end surface of the disk body. A dust cover plate is provided on the outer side of the dust cover, and the upper end of the dust cover plate is pressed against the edge of the dust cover. A sealing groove 1 is provided at the position of the edge of the dust cover corresponding to the dust cover plate, and a dust strip 1 is installed inside the sealing groove 1. A blocking cover is provided at the position of the middle part of the dust cover corresponding to the wedge core sleeve 2, and the blocking cover is located inside the dust cover and the upper end of the blocking cover is fixed to the dust cover by bolts.

[0012] Preferably, a second sealing groove is provided on the upper end surface of the disc body on both sides of the slide seat, and a second dustproof strip is installed inside the second sealing groove.

[0013] By adding a dust cover, a dust cover plate, and dust strips 1 and 2, a good seal can be formed on the upper end surface of the disk body, effectively preventing foreign matter such as dust and iron powder generated by cutting from entering the interior of the disk body, thereby forming good protection for the components inside the disk body.

[0014] Preferably, an insert is fixed on the clamping surface of the jaw and the workpiece, and a pad is provided between the insert and the jaw. When the position of the jaw is adjusted, when the offset is an integer multiple of the comb tooth pitch, it can be adjusted by moving the comb teeth. When the offset is not an integer multiple of the comb tooth pitch, it can be adjusted by adding pads of different thicknesses to ultimately meet the eccentricity requirements.

[0015] In summary, the present invention includes at least one of the following beneficial technical effects:

[0016] 1. The double-action oil cylinder and the wedge core sleeve 1 and wedge core sleeve 2 are used together to form a double-action effect. The two sets of opposing jaws move independently to clamp the workpiece. The operator can adjust the position of each jaw independently according to the offset and adjust the meshing of the comb teeth at different positions, which greatly reduces the requirements for the operator. The jaw position adjustment is convenient and fast, which effectively shortens the time for adjusting the jaws and improves work efficiency. At the same time, the double-action oil cylinder pulls the two sets of jaws to move independently to clamp the breaker cylinder body, and the clamping force of the chuck is doubled. Compared with the traditional hydraulic four-jaw chuck, the double-action oil cylinder can achieve a stable clamping effect by maintaining normal pressure, and it is no longer necessary to increase the cylinder pressure, which greatly increases the service life of the cylinder;

[0017] 2. When the offset is not an integer multiple of the tooth pitch, it is difficult to meet the adjustment requirements by simply adjusting the meshing of the comb teeth at different positions. At this time, pads of different thicknesses are added to adjust the pads to meet the eccentricity requirements;

[0018] 3. A dust cover, a dust cover plate, and dust strips 1 and 2 are provided on the upper end surface of the disk body, which can form a good seal on the upper end surface of the disk body, effectively prevent dust, iron powder generated by cutting and other foreign matter from entering the interior of the disk body, and provide good protection for the components inside the disk body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a stereogram of the present invention;

[0020] Figure 2 It is an exploded view showing the positional relationship of each component on the disk;

[0021] Figure 3 It is a three-dimensional image of the disk;

[0022] Figure 4 It is a schematic diagram of the combination of the wedge core sleeve 1 and the wedge core sleeve 2;

[0023] Figure 5 It is a three-dimensional diagram with a wedge-shaped center and a wedge-shaped center;

[0024] Figure 6 It is a stereogram of the wedge core set II;

[0025] Figure 7 It is a cross-sectional schematic diagram showing the pulling mode of the wedge core sleeve 1 and the wedge core sleeve 2;

[0026] Figure 8 is a cross-sectional schematic diagram showing the pulling mode of the second clamping claw and the fourth clamping claw;

[0027] Fig. 9 It is a cross-sectional schematic diagram showing the pulling mode of the first clamping jaw and the third clamping jaw;

[0028] Fig.10 It is a schematic diagram showing the working state of the claw.

[0029] In the figure, 1, plate body; 2, clamping claw; 3, slide seat; 4, T-block; 5, wedge core sleeve 1; 6, wedge core sleeve 2; 7, slide groove; 8, comb tooth 1; 9, comb tooth 2; 11, first clamping claw; 12, second clamping claw; 13, third clamping claw; 14, fourth clamping claw; 15, cylindrical cavity; 16, T-groove 1; 17, T-key 1; 18, square cavity; 19, center long hole 1; 20, T-groove 2; 2 1. T-key 2; 22. Large piston rod; 23. Small piston rod; 24. Dust cover; 25. Dust cover plate; 26. Sealing groove 1; 27. Dust strip 1; 28. Plug cover; 29. ​​Sealing groove 2; 30. Dust strip 2; 31. Insert; 32. Spacer; 33. T-shaped long groove; 34. Fitting groove; 35. Give way groove; 36. Annular groove; 37. O-ring; 38. Power cylinder; 39. Center long hole 2. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0031] Reference Figure 1-3 A hydraulic four-jaw double-acting chuck includes a chuck body 1, which is flat and cylindrical and is installed on a lathe. Four slide grooves 7 are symmetrically distributed in a cross shape on the upper end surface of the chuck body 1. A slide seat 3 is slidably installed inside the slide groove 7. A clamping claw 2 is correspondingly fixed on the slide seat 3. A comb tooth 8 is provided on the upper end surface of the slide seat 3, and a comb tooth 2 is provided on the lower end surface of the clamping claw 2. A T-shaped long groove 33 is provided on the upper end surface of the slide seat 3 along the length direction. A clamping claw 2 is installed inside the T-shaped long groove 33. A matching T-block 4, the upper end of which protrudes from the upper end surface of the slide 3, and a long strip-shaped engaging groove 34 is provided on the lower end surface of the claw 2 corresponding to the portion of the T-block 4 protruding from the slide 3. The claw 2 is indirectly fixed to the slide 3 through the T-block 4 and the comb teeth 1 8 and the comb teeth 2 9 are meshed. At the same time, the portion of the T-block 4 protruding from the upper end surface of the slide 3 extends into the engaging groove 34 below the claw 2, and the claw 2 and the T-block 4 are connected by the same long bolt.

[0032] Reference Figure 1-9The clamping jaw 2 includes a first clamping jaw 11, a second clamping jaw 12, a third clamping jaw 13 and a fourth clamping jaw 14. The first clamping jaw 11 and the third clamping jaw 13 are arranged opposite to each other and are combined into a group of clamping jaws. The second clamping jaw 12 and the fourth clamping jaw 14 are arranged opposite to each other and are combined into another group of clamping jaws. A cylindrical cavity 15 is opened in the middle of the disc body 1. A wedge core sleeve 5 is slidably installed inside the cylindrical cavity 15. The wedge core sleeve 5 is corresponding to the first clamping jaw 11 and the third clamping jaw 14. The two ends of the three clamping claws 13 are provided with an oblique wedge-shaped T-shaped groove 16, and the inner ends of the first clamping claw 11 and the third clamping claw 13 are provided with an oblique wedge-shaped T-shaped key 17, and the T-shaped key 17 is slidably installed in the T-shaped groove 16. Pull the wedge core sleeve 5, and the T-shaped key 17 and the T-shaped groove 16 cooperate with each other to drive the slide seat 3 under the first clamping claw 11 and the third clamping claw 13 to move, and then drive the first clamping claw 11 and the third clamping claw 13 to move, and the wedge core sleeve A square cavity 18 is provided at the upper end of the wedge core sleeve 15, and a wedge core sleeve 2 6 is slidably connected inside the wedge core sleeve 15. The wedge core sleeve 15 and the wedge core sleeve 2 6 are coaxial, and the lower end of the wedge core sleeve 2 6 is inserted into the central long hole 19 of the wedge core sleeve 15. The upper end of the wedge core sleeve 2 6 is correspondingly installed inside the square cavity 18 and the shape is adapted to the square cavity 18. The two ends of the wedge core sleeve 15 corresponding to the second clamping claw 12 and the fourth clamping claw 14 are provided with a clearance groove 35. The two ends extend out of the clearance groove 35 and are provided with an oblique wedge-shaped T-shaped groove 20. The inner ends of the second clamping jaw 12 and the fourth clamping jaw 14 are fixed with an oblique wedge-shaped T-shaped key 21. The T-shaped key 21 is slidably installed in the T-shaped groove 20. Pull the wedge core sleeve 26, and through the cooperation of the T-shaped key 21 and the T-shaped groove 20, the slide seat 3 under the second clamping jaw 12 and the fourth clamping jaw 14 is driven to move, and then the second clamping jaw 12 and the fourth clamping jaw 14 are driven to move. The wedge core sleeve 15 and the wedge core sleeve 26 cooperate with each other, and can independently control the movement of the two groups of opposing clamping jaws 2, forming a double-action effect, which is suitable for clamping square workpieces.

[0033] Reference Figure 7-9 A power cylinder 38 is provided at the position corresponding to the wedge core sleeve 1 5 and the wedge core sleeve 2 6 below the disk body 1. The power cylinder 38 is installed on the lathe. The power cylinder 38 is a double-acting oil cylinder on the same side, including a large piston rod 22 and a small piston rod 23. The piston parts of the large piston rod 22 and the small piston rod 23 are movably inserted in the cylinder body cavity of the double-acting oil cylinder. The upper end of the small piston rod 23 extends into the center long hole 19 with the wedge core sleeve 1 5. The upper ends of the wedge core sleeve 2 6 and the small piston rod 23 are connected by the same long bolt. The top of the long bolt is clamped in the center long hole 2 39 of the wedge core sleeve 2 6. The bottom of the long bolt is screwed with the upper end of the small piston rod 23. The lower section of the center long hole 19 of the wedge core sleeve 5 is provided with an internal thread, so that the bottom of the wedge core sleeve 5 and the top pitch of the large piston rod 22 are fixed. The large piston rod 22 of the power cylinder 38 pulls the wedge core sleeve 1 5, and the small piston rod 23 pulls the wedge core sleeve 2 6, and they work independently.

[0034] The height of the upper end of the wedge-shaped sleeve 6 is smaller than the depth of the square cavity 18, thereby forming a sliding space between the upper bottom surface of the wedge-shaped sleeve 6 and the bottom surface of the square cavity 18. A space is left between the upper bottom surface of the wedge-shaped sleeve 6 and the bottom surface of the square cavity 18 to facilitate the up and down sliding of the wedge-shaped sleeve 6, so that the wedge-shaped sleeve 6 always slides along the side of the square cavity 18, thereby enhancing stability during sliding.

[0035] Reference Figure 1 and Figure 2 A dust cover 24 is provided at the upper end opening of the cylindrical cavity 15 corresponding to the upper end surface of the disk body 1. The dust cover 24 is fixed to the disk body 1 by bolts. The dust cover 24 is a square dust cover 24 and is located at the center position of the upper end surface of the disk body 1. The four sides of the dust cover 24 correspond to the positions of the four claws 2 respectively. A plugging cover 28 is provided at the center of the dust cover 24 corresponding to the position of the wedge core sleeve 26. The upper end of the plugging cover 28 is fixed to the dust cover 24 by bolts. The lower end of the plugging cover 28 extends into the center long hole 239 of the wedge core sleeve 26 and is slidably connected with the wedge core sleeve 26. The dust cover 24 and the plugging cover 28 can achieve sealing of the upper end opening of the disk body 1, and can effectively prevent foreign matter from entering the wedge core sleeve 26 and the disk body 1 during the processing of the workpiece, and protect the internal parts of the disk body 1. The upper end of the dust cover 24 plate is always pressed against the dust strip 27, and the gap between the dust cover 24 plate and the dust cover 24 is further sealed through the dust strip 27.

[0036] Reference Figure 1-3 A sealing groove 29 is provided at the position on the upper end surface of the disk body 1 corresponding to both sides of the slide seat 3, and a dustproof strip 30 is installed inside the sealing groove 29. The dustproof strip 30 is fixed to the disk body 1 by bolts. The side of the dustproof strip 30 is in close contact with the side of the slide seat 3 and the side of the dust cover 24. The dustproof strip 30 can effectively prevent foreign matter from entering the inside of the disk body 1 through the gap between the slide seat 3 and the disk body 1.

[0037] By adding the dust cover 24, the dust cover 24 plate, the dust strip 1 27 and the dust strip 2 30, a good seal can be formed on the upper end surface of the disk body 1, effectively preventing dust, iron powder generated by cutting and other foreign matter from entering the interior of the disk body 1, and forming good protection for the components inside the disk body 1.

[0038] Reference Figure 2 A horizontal closed annular groove 36 is provided on the outer side surface of the lower end of the wedge core sleeve 2 6, and an O-ring 37 is installed inside the annular groove 36. The inner side surface of the central long hole 19 of the wedge core sleeve 1 5 contacts and squeezes the O-ring 37. The O-ring 37 can seal the gap between the wedge core sleeve 1 5 and the wedge core sleeve 2 6 to prevent foreign matter from entering, so that the wedge core sleeve 2 6 has good smoothness when sliding.

[0039] Reference Figure 1 and Fig.10 , an insert 31 is provided on the surface of the jaw 2 that contacts the workpiece, a pad 32 is provided between the insert 31 and the side of the jaw 2, the pad 32 is made of 45 steel, the insert 31 is made of 20CrMnTi, the insert 31 and the pad 32 are fixed to the jaw 2 by the same bolt, and the work is first adjusted by moving the comb teeth at different positions to meet the eccentricity requirements. Since the tooth pitch between the comb teeth is constant, when the offset is an integer multiple of the comb tooth pitch, it can be adjusted by moving the comb teeth. When the offset is not an integer multiple of the comb tooth pitch, it can be adjusted by adding pads 32 of different thicknesses. 20CrMnTi has good low-temperature impact toughness, small processing deformation, and good fatigue resistance, which can meet the extrusion requirements on the side of the breaker cylinder body.

[0040] Since two groups of opposing jaws 2 move independently to clamp the side of the breaker cylinder body, the first jaw 11 and the third jaw 13 form a group, and the second jaw 12 and the fourth jaw 14 form a group, the staff independently adjusts the position of each jaw 2 and adds a cushion block 32 according to the different offsets of the side of the breaker cylinder body. The first jaw 11 and the third jaw 13 are symmetrically arranged with the center of the eccentric hole. When adjusting, the meshing condition of the comb teeth and the thickness of the cushion block 32 can be kept consistent. The second jaw 12 and the fourth jaw 14 can be independently adjusted in position according to the size of the workpiece. The two groups of jaws 2 are clamped from the opposite sides of the breaker cylinder body, which reduces the time for the operator to adjust the jaws 2, reduces the requirements for the operator, and greatly improves work efficiency.

[0041] Working process: Place the breaker cylinder body on the upper end of the disc body 1, and align the eccentric hole on the breaker cylinder body with the center of the disc body 1. The staff first adjusts the position of the claw 2 according to the size of the breaker cylinder body, and adjusts the position of the claw 2 by moving the comb teeth in different positions. When the comb tooth pitch does not meet the adjustment requirements, the eccentricity requirements are met by adding pads 32 of different thicknesses. The two groups of claws 2 are independently driven by the double-acting cylinder to move and clamp the sides of the breaker cylinder body. The large piston rod 22 pulls the wedge core sleeve 1 5, driving the slide 3 and the first and third claws 11 and 13 to move and clamp the left and right sides of the breaker cylinder body. The small piston rod 23 pulls the wedge core sleeve 2 6, driving the slide 3 and the second and fourth claws 12 and 14 to move and clamp the front and rear sides of the breaker cylinder body. Finally, the breaker cylinder body is clamped and the eccentric hole can be processed.

[0042] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic four-jaw double-acting centering chuck, comprising a chuck body (1), a chuck jaw (2), a slide seat (3), a T-block (10), a wedge core sleeve 1 (5) and a wedge core sleeve 2 (6), characterized in that: The upper end surface of the disk body (1) is provided with a slide groove (7), the slide seat (3) is slidably arranged inside the slide groove (7), the upper end surface of the slide seat (3) is provided with a comb tooth 1 (8), the lower end surface of the clamping claw (2) is provided with a comb tooth 2 (9), the clamping claw (2) is indirectly fixed to the slide seat (3) through a T-shaped block (10), the comb tooth 1 (8) and the comb tooth 2 (9) are meshed, the clamping claw (2) includes a first clamping claw (11), a second clamping claw (12), a third clamping claw (13) and a fourth clamping claw (14), the first clamping claw (11) and the third clamping claw (13) are arranged opposite to each other, the second clamping claw (12) and the fourth clamping claw (14) are arranged opposite to each other, the disk body (1) is provided with a cylindrical cavity (15), the wedge core The two ends of the sleeve (5) are provided with oblique wedge-shaped T-shaped grooves (16), the inner ends of the first clamping claw (11) and the third clamping claw (13) are provided with oblique wedge-shaped T-shaped keys (17), and the wedge core sleeve (5) is slidably installed in the cylindrical cavity (15) by matching the T-shaped grooves (16) and the T-shaped keys (17). The upper end of the wedge core sleeve (5) is provided with a square cavity (18), the upper end of the wedge core sleeve (6) is located inside the square cavity (18), and the lower end of the wedge core sleeve (6) is correspondingly inserted into the center long hole (19) of the wedge core sleeve (5). The two ends of the wedge core sleeve (6) are provided with oblique wedge-shaped T-shaped grooves (20), the second clamping claw (12) and the fourth clamping claw (14) are provided with oblique wedge-shaped grooves (20). ) are provided with an oblique wedge-shaped T-shaped key 2 (21), and the wedge core sleeve 2 (6) is slidably installed in the wedge core sleeve 1 (5) by matching the T-shaped groove 2 (20) and the T-shaped key 2 (21). A power cylinder (38) is installed on the lathe, and the power cylinder (38) independently pulls the wedge core sleeve 1 (5) and the wedge core sleeve 2 (6) respectively, and independently drives the two opposite groups of claws (2) to move. The upper end height of the wedge core sleeve 2 (6) is less than the depth of the square cavity (18), and a sliding space is formed between the upper end bottom surface of the wedge core sleeve 2 (6) and the bottom surface of the square cavity (18). A dust cover (24) is provided on the disk body (1), and the dust cover (24) is located on the upper end surface of the disk body (1). A dust cover plate (25) is provided on the outside of the dust cover (24) at the center position, the upper end of the dust cover plate (25) is pressed against the edge of the dust cover (24), a sealing groove (26) is provided at the edge of the dust cover (24) corresponding to the position of the dust cover plate (25), a dust strip (27) is installed inside the sealing groove (26), a plug cover (28) is provided at the middle of the dust cover (24) corresponding to the position of the wedge core sleeve (6), the plug cover (28) is located inside the dust cover (24) and the upper end of the plug cover (28) is fixed to the dust cover (24) by bolts, an insert (31) is fixed on the clamping surface of the clamping claw (2) and the workpiece, and a cushion block (32) is provided between the insert (31) and the clamping claw (2).

2. A hydraulic four-jaw double-acting centering chuck according to claim 1, characterized in that: The power cylinder is a double-acting cylinder on the same side, comprising a large piston rod (22) and a small piston rod (23). The piston parts of the large piston rod (22) and the small piston rod (23) are movably installed in the inner cavity of the cylinder body of the double-acting cylinder. The upper end of the small piston rod (23) extends into the center long hole (19) of the wedge core sleeve (5). The upper end of the small piston rod (23) is connected and fixed to the lower end of the wedge core sleeve (6) by the same long bolt. The upper end of the large piston rod (22) is screwed to the lower end of the wedge core sleeve (5) to pull the wedge core sleeve (5).

3. A hydraulic four-jaw double-acting centering chuck according to claim 1, characterized in that: The upper end surfaces of the disc body (1) on both sides of the slide seat (3) are provided with sealing grooves 2 (29), and dustproof strips 2 (30) are installed inside the sealing grooves 2 (29).

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