CN212761177U

CN212761177U - Hydraulic drive chuck

Info

Publication number: CN212761177U
Application number: CN202021057684.6U
Authority: CN
Inventors: 王永虎; 王慧庆
Original assignee: Shandong Dysenbote Intelligent Equipment Co ltd
Current assignee: Shandong Dysenbote Intelligent Equipment Co ltd
Priority date: 2020-06-10
Filing date: 2020-06-10
Publication date: 2021-03-23
Anticipated expiration: 2030-06-10

Abstract

The utility model discloses a hydraulic drive chuck, which comprises a turntable; a first clamping device and a second clamping device are respectively arranged on the front side of the turntable; the first clamping device comprises a first driving mechanism, a first roller carrier and a first roller; the second clamping device comprises a second driving mechanism, a second roller frame and a second roller; a cushion block is arranged between the second driving mechanism and the rotary table; the upper part and the lower part of the first clamping device are respectively provided with a synchronous centering device, and the two first roller carriers are connected through the two synchronous centering devices; and the left side and the right side of the second clamping device are respectively provided with a synchronous centering device, and the two second roller carriers are connected through the two synchronous centering devices. The utility model adopts a double-acting operation mode for the two groups of rollers, and is suitable for clamping various special-shaped workpieces; the mechanical centering mode of gear and rack meshing is adopted, so that the centering precision is improved; the hydraulic drive is adopted to improve the clamping force, and intelligent control is facilitated.

Description

Hydraulic drive chuck

Technical Field

The utility model relates to a machining equipment technical field especially relates to a hydraulic drive chuck.

Background

In the field of machining technology, a chuck is a common machining device, and is used for further machining such as cutting and punching after a workpiece is fastened. The chuck in the prior art has certain defects in the use process:

(1) in the chuck in the prior art, a pair of rollers is usually arranged in the vertical direction, and a pair of rollers is arranged in the horizontal direction, and the chuck generally operates in a manner that the two pairs of rollers are linked simultaneously, i.e. the two pairs of rollers operate together and start or stop simultaneously, so that each pair of rollers cannot operate independently.

This structure is effective in clamping a regular workpiece such as a round pipe or a square pipe, but there is a problem in clamping an irregular workpiece such as a rectangular pipe, for example, after a first pair of rollers clamp one pair of opposite sides of the rectangular pipe, the other pair of rollers, which have not clamped the rectangular pipe, stops operating as the first pair of rollers stops. Therefore, it is not suitable for holding various special-shaped workpieces.

(2) The piston rods of the driving device of the chuck are consistent in movement speed theoretically, but in the actual working process, strict synchronous action cannot be realized generally due to manufacturing errors and the like, and clamping and centering of workpieces are not facilitated. In addition, the chuck in the prior art mostly adopts a connecting rod or a guide groove mechanism, and is low in precision and easy to wear in the machining process, and the problem of low centering precision caused by the fact that the same group of rollers are not easy to realize high synchronous motion is solved.

(3) The chuck in the prior art usually adopts pneumatic type or electrodynamic type power to press from both sides tight the work piece, and the clamp force is little, and presss from both sides tight adjustable scope and is little, is unfavorable for carrying out intelligent control.

SUMMERY OF THE UTILITY MODEL

In order to make up the defects of the prior art, the utility model provides a hydraulic drive chuck, which enables two groups of rollers to adopt a double-acting operation mode, and the two groups of rollers are started simultaneously, do not interfere with each other, are clamped respectively, and are suitable for clamping various special-shaped workpieces; in addition, a mechanical centering mode of gear and rack meshing is adopted, each group of rollers are forced to move synchronously, and centering precision is improved; adopt hydraulic pressure as clamping power, improvement clamp force that can be very big, and the adjustment range of clamp force is great, easily realizes stepless speed regulation, and can adopt electric proportional control, is convenient for carry out intelligent control to solve the problem that exists among the prior art.

The utility model discloses a realize through following technical scheme:

a hydraulic drive chuck comprises a rotary table, wherein a first workpiece machining hole is formed in the center of the rotary table;

a first clamping device and a second clamping device are respectively arranged on the front side of the turntable; the first clamping device comprises two first oil cylinders which are symmetrically distributed in the horizontal direction, piston rods of the first oil cylinders are connected with first roller carriers, and the inner sides of the first roller carriers are provided with first rollers;

the second clamping device comprises two second oil cylinders which are symmetrically distributed in the vertical direction, piston rods of the second oil cylinders are connected with second roller carriers, and the inner sides of the second roller carriers are provided with second rollers;

a cushion block is arranged between the second oil cylinder and the turntable, and the second roller carrier is positioned at the front part of the first roller carrier;

the upper part and the lower part of the first clamping device are respectively provided with a synchronous centering device, and the two first roller carriers are connected through the two synchronous centering devices;

and the left side and the right side of the second clamping device are respectively provided with a synchronous centering device, and the two second roller carriers are connected through the two synchronous centering devices.

Further optimally, the synchronous centering device comprises a gear box, and a first installation cavity is arranged inside the gear box; a synchronous gear is arranged in the first mounting cavity, centering shafts are arranged at two ends of the synchronous gear, and the two centering shafts are movably mounted on the side wall of the gear box respectively;

two centering through holes are formed in the gear box and are respectively positioned at the upper part and the lower part of the synchronous gear; two racks are movably mounted in the two centering through holes respectively, the two racks are meshed with the synchronous gear respectively, and the two racks are distributed in a centrosymmetric manner by taking the synchronous gear as a circle center; two centering bearings are arranged in the first mounting cavity, and the two centering bearings are sleeved on the two centering shafts respectively.

Preferably, pre-tightening covers are movably mounted at the upper end and the lower end of the first mounting cavity, and second mounting cavities are arranged in the pre-tightening covers; a plurality of pre-tightening bearings are respectively sleeved on the pre-tightening shafts; the upper pre-tightening bearing is contacted with the upper rack, and the lower pre-tightening bearing is contacted with the lower rack.

Preferably, the upper part and the lower part of the gear box are respectively provided with a plurality of threaded holes, and the pre-tightening cover is respectively provided with a pre-tightening hole corresponding to the threaded hole; the pre-tightening cover is fixedly connected with the gear box through screws, and the screws respectively penetrate through the pre-tightening holes and the threaded holes.

Preferably, the upper ends of the two first roller frames are fixedly connected with the two racks of the upper synchronous centering device respectively, and the lower ends of the two first roller frames are fixedly connected with the two racks of the lower synchronous centering device respectively; the left ends of the two second roller carriers are fixedly connected with the two racks of the left synchronous centering device respectively, and the right ends of the two second roller carriers are fixedly connected with the two racks of the right synchronous centering device respectively.

Preferably, the upper part and the lower part of the first oil cylinder are provided with first guide blocks; the upper part and the lower part of the first clamping device are respectively provided with a first guide rod; the upper end and the lower end of the first roller carrier are provided with first guide holes; two ends of the upper first guide rod are respectively fixedly connected with the upper two first guide blocks, and the upper first guide rod respectively penetrates through the upper two first guide holes; two ends of the lower first guide rod are respectively fixedly connected with the two lower first guide blocks, and the lower first guide rod respectively penetrates through the two lower first guide holes;

the left side and the right side of the second oil cylinder are both provided with a second guide block; the left side and the right side of the second clamping device are both provided with a second guide rod; second guide holes are formed in the left end and the right end of the second roller carrier; two ends of the left second guide rod are respectively fixedly connected with the left two second guide blocks, and the left second guide rod respectively penetrates through the left two second guide holes; the two ends of the second guide rod on the right side are fixedly connected with the two second guide blocks on the right side respectively, and the second guide rod on the right side penetrates through the two second guide holes on the right side respectively.

Further optimally, an oil supply device is arranged at the rear part of the rotary table, the oil supply device comprises an oil distribution ring, and a first oil inlet and a first oil outlet are respectively arranged on the outer side wall of the oil distribution ring; the inner side wall of the oil distribution ring is respectively provided with an annular oil inlet groove and an annular oil outlet groove, the first oil inlet is communicated with the oil inlet groove, and the first oil outlet is communicated with the oil outlet groove;

a rotating shaft is movably arranged in the oil distribution ring, and a second workpiece machining hole is formed in the center of the rotating shaft; 4 oil supply assemblies which are uniformly distributed along the circumferential direction are arranged on the rotating shaft, and each oil supply assembly comprises a second oil inlet, a second oil outlet, an oil inlet pipe and an oil outlet pipe; the second oil inlet and the second oil outlet are positioned on the side wall of the front part of the rotating shaft; the oil inlet pipe and the oil outlet pipe are located inside the rotating shaft, the second oil inlet is communicated with the oil inlet groove through the oil inlet pipe, and the second oil outlet is communicated with the oil outlet groove through the oil outlet pipe.

Preferably, the inner side wall of the oil distribution ring is provided with a plurality of annular seal grooves, the outer side wall of the rotating shaft is provided with a plurality of seal rings corresponding to the seal grooves, and the seal rings are movably arranged in the corresponding seal grooves.

Further optimally, the rotating shaft is fixedly connected with the rotating disc; the rear part of the oil distribution ring is provided with a supporting bearing, and the oil distribution ring is fixedly connected with the outer ring of the supporting bearing; the lower part of the outer ring of the support bearing is fixedly connected with a base; a driven gear is arranged at the rear part of the supporting bearing and is connected with an inner ring of the supporting bearing; the upper part of the outer ring of the support bearing is fixedly connected with a transmission case, a driving gear is movably arranged in the transmission case, and the driving gear is meshed with a driven gear; a speed reducer is arranged on the transmission case and is connected with the driving gear; the speed reducer is connected with a servo motor.

Further optimally, a protective cover is arranged at the front part of the rotary table, and a third workpiece machining hole is formed in the protective cover.

The utility model has the advantages that:

(1) the two groups of rollers of the chuck adopt a double-acting operation mode, and the two groups of rollers are started simultaneously, do not interfere with each other, are clamped respectively, and are suitable for clamping various special-shaped workpieces.

(2) And a mechanical centering mode of gear and rack meshing is adopted, so that each group of rollers can move synchronously forcibly, and the centering precision is improved.

(3) Adopt hydraulic pressure as clamping power, improvement clamp force that can be very big, and the adjustment range of clamp force is great, easily realizes stepless speed regulation, and can adopt electric proportional control, is convenient for carry out intelligent control.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a schematic structural view of the first clamping device of the present invention.

Fig. 3 is a schematic structural view of the second clamping device of the present invention.

Fig. 4 is a schematic perspective view of the middle synchronous centering device of the present invention.

Fig. 5 is a schematic diagram of the front section structure of the middle synchronous centering device of the present invention.

Fig. 6 is a schematic side sectional view of the synchronous centering device of the present invention.

Fig. 7 is a schematic structural diagram of the middle gear box of the present invention.

Fig. 8 is a schematic structural view of the pre-tightening cover of the present invention.

Fig. 9 is a schematic structural view of the front portion of the middle oil distribution ring of the present invention.

Fig. 10 is a rear structure schematic diagram of the middle oil distribution ring of the present invention.

Fig. 11 is a schematic side sectional view of the oil distribution ring of the present invention.

Fig. 12 is an enlarged schematic view of a portion a in fig. 11.

Fig. 13 is an enlarged schematic view of the structure at B in fig. 11.

Fig. 14 is a schematic side view of the present invention.

Fig. 15 is a schematic structural view of the middle protective cover of the present invention.

In the figure, 1, a turntable; 11. machining a hole in a first workpiece; 12. cushion blocks; 13. a synchronous centering device; 14. a rack; 15. an oil supply device;

2. a first holding device; 21. a first cylinder; 22. a first roller frame; 23. a first roller; 24. a first guide block; 25. a first guide bar; 26. a first guide hole;

3. a second holding device; 31. a second cylinder; 32. a second roller frame; 33. a second roller; 34. a second guide block; 35. a second guide bar; 36. a second guide hole;

4. a gear box; 41. a first mounting cavity; 42. a synchronizing gear; 43. aligning the middle shaft; 44. centering the through hole; 45. Centering the bearing; 46. a threaded hole;

5. pre-tightening a cover; 51. a second mounting cavity; 52. pre-tightening the shaft; 53. pre-tightening the bearing; 54. pre-tightening the hole; 55. A screw;

6. an oil distribution ring; 61. a first oil inlet; 62. a first oil outlet; 63. an oil inlet groove; 64. an oil outlet groove; 65. A sealing groove;

7. a rotating shaft; 71. machining a hole in the second workpiece; 72. an oil supply assembly; 73. a second oil inlet; 74. a second oil outlet; 75. an oil inlet pipe; 76. an oil outlet pipe; 77. a seal ring;

8. a support bearing; 81. a base; 82. a driven gear; 83. a transmission case; 84. a speed reducer; 85. a servo motor; 86. a protective cover; 87. and machining a hole in the third workpiece.

Detailed Description

In order to clearly illustrate the technical features of the present invention, the present invention is explained in detail by the following embodiments in combination with the accompanying drawings.

As shown in fig. 1-15, the present embodiment discloses a hydraulically driven chuck, which includes a rotary table 1, and a first workpiece processing hole 11 (shown in fig. 1) is provided at a central position of the rotary table 1, for allowing a workpiece to pass through the first workpiece processing hole 11 for processing.

A first clamping device 2 and a second clamping device 3 (shown in figure 1) are respectively arranged at the front side of the rotary table 1; the first clamping device 2 comprises two first oil cylinders 21 which are symmetrically distributed in the horizontal direction, piston rods of the first oil cylinders 21 are connected with first roller carriers 22, first rollers 23 (shown in fig. 2) are arranged on the inner sides of the first roller carriers 22, and the first oil cylinders 21 drive the first rollers 23 to clamp the workpiece in the horizontal direction.

The second clamping device 3 includes two second oil cylinders 31 symmetrically distributed in the vertical direction, the piston rods of the second oil cylinders 31 are connected to second roller frames 32, the inner sides of the second roller frames 32 are provided with second rollers 33 (as shown in fig. 3), and the second oil cylinders 31 clamp the workpiece in the vertical direction.

A spacer 12 (shown in fig. 3) is provided between the second cylinder 31 and the turntable 1, so that the second roller frame 32 is located at the front of the first roller frame 22, and the two sets of rollers are at different positions in the vertical direction to clamp different positions of the workpiece. The first clamping device 2 and the second clamping device 3 can independently act without interference, and respectively drive the first roller 23 and the second roller 33 to clamp the workpiece, so that the clamping device is suitable for clamping various special-shaped workpieces.

Through using first hydro-cylinder 21 and second hydro-cylinder 31, adopt hydraulic pressure as clamping power, improvement clamp force that can be very big, and the adjustment range of clamp force is great, easily realizes stepless speed control, and can adopt electric proportional control, is convenient for carry out intelligent control.

Synchronous centering devices 13 (as shown in fig. 2) are arranged at the upper part and the lower part of the first clamping device 2, and the two first roller frames 22 are connected through the two synchronous centering devices 13, so that the two first rollers 23 can synchronously act, and the centering precision is improved.

Synchronous centering devices 13 (as shown in fig. 3) are arranged on the left side and the right side of the second clamping device 3, and the two second roller frames 32 are connected through the two synchronous centering devices 13, so that the two second rollers 33 can synchronously act, and the centering precision is improved.

As a preferred embodiment, the synchronous centering device 13 includes a gear box 4 (shown in fig. 4), and a first mounting cavity 41 (shown in fig. 5) is provided inside the gear box 4; a synchronizing gear 42 is arranged in the first mounting cavity 41, two ends of the synchronizing gear 42 are respectively provided with a counter center shaft 43, and the two counter center shafts 43 are respectively movably mounted on the side wall of the gear box 4, so that the synchronizing gear 42 can rotate around the counter center shafts 43.

Two centering through holes 44 (shown in fig. 7) are formed in the gear box 4, and the two centering through holes 44 are respectively located at the upper part and the lower part of the synchronizing gear 42; two racks 14 are movably mounted in the two centering through holes 44 respectively, the two racks 14 are engaged with the synchronizing gear 42 respectively, and the two racks 14 are distributed in a centrosymmetric manner by taking the synchronizing gear 42 as a circle center. By simultaneously engaging the two racks 14 with the synchronizing gear 42, the two racks 14 can be forcibly operated in synchronization. Two centering bearings 45 (as shown in fig. 6) are arranged in the first mounting cavity 41, the two centering bearings 45 are respectively sleeved on the two centering shafts 43, and resistance to rotation of the centering shafts 43 is reduced by the centering bearings 45.

As a preferred embodiment, a pre-tightening cover 5 (as shown in fig. 8) is movably mounted at both the upper end and the lower end of the first mounting cavity 41, and a second mounting cavity 51 is arranged in each pre-tightening cover 5; a plurality of pre-tightening bearings 53 are respectively sleeved on the pre-tightening shafts 52, and a plurality of pre-tightening shafts 52 are movably mounted in the second mounting cavities 51; the upper preloaded bearing 53 is in contact with the upper rack 14, and the lower preloaded bearing 53 is in contact with the lower rack 14 (as shown in fig. 5), so as to press the two racks 14, and the resistance of the racks 14 during movement is not increased by the preloaded bearing 53. When the synchronizing gear 42 is meshed with the two racks 14, proper clearance is needed, too large or too small is unfavorable for synchronism, the pre-tightening bearing 53 is arranged on the pre-tightening shaft 52, the cylindrical surface of the bearing is contacted with the back surface of the rack, the pre-tightening shaft 52 is arranged on the pre-tightening cover 5, and the clearance between the racks 14 and the synchronizing gear 42 can be adjusted by adjusting the distance between the pre-tightening cover 5 and the gear box 4.

As a preferred embodiment, a plurality of threaded holes 46 are formed in the upper and lower portions of the gear box 4, and a pre-tightening hole 54 corresponding to the threaded hole 46 is formed in each pre-tightening cover 5; the pre-tightening cover 5 is fixedly connected with the gear box 4 through screws 55, and the screws 55 respectively penetrate through the pre-tightening holes 54 and the threaded holes 46 (as shown in fig. 6) and are used for adjusting the size of the gap between the pre-tightening cover 5 and the gear box 4. Due to manufacturing errors of the racks and the gears, abrasion in the using process and other factors, the clearance between the racks and the gears needs to be adjusted to enable the racks and the gears to be meshed properly. Through setting up pretension axle 52 and pretension bearing 53 to adjusting screw 55 to adjust the elasticity degree that pretension bearing 53 pressed at the rack back, and then the clearance of adjustment rack and pinion can strengthen reliability and compactness between rack and the gear, prolong the life of gear and rack, improved the precision of pressing from both sides tight work piece.

As a preferred embodiment, the upper ends of the two first roller frames 22 are fixedly connected with the two racks 14 of the upper synchronous centering device 13, respectively, and the lower ends of the two first roller frames 22 are fixedly connected with the two racks 14 of the lower synchronous centering device 13, respectively (as shown in fig. 2); the two racks 14 are meshed with the synchronous gear 42 together, when the first oil cylinders 21 act, the two racks 14 move oppositely, when the action speeds of the two first oil cylinders 21 are different, the movement speeds of the two racks 14 are different, but the two racks 14 are meshed with the synchronous gear 42 together, and the speeds of the two racks 14 are forcibly synchronized through the synchronous gear 42, so that the two first rollers 23 realize high synchronous movement, and the centering precision is improved.

The left ends of the two second roller frames 32 are respectively and fixedly connected with the two racks 14 of the left synchronous centering device 13, and the right ends of the two second roller frames 32 are respectively and fixedly connected with the two racks 14 of the right synchronous centering device 13 (as shown in fig. 3); the two racks 14 are meshed with the synchronizing gear 42 together, when the second oil cylinder 31 acts, the two racks 14 move oppositely, when the acting speeds of the two first oil cylinders 31 are different, the moving speeds of the two racks 14 are different, but the two racks 14 are meshed with the synchronizing gear 42 together, and the speeds of the two racks 14 are forcibly synchronized through the synchronizing gear 42, so that the two second rollers 33 realize high-degree synchronous movement, and the centering precision is improved.

As a preferred embodiment, a first guide block 24 is provided at both upper and lower portions of the first cylinder 21; a first guide rod 25 is arranged at the upper part and the lower part of the first clamping device 2; the upper end and the lower end of the first roller carrier 22 are provided with first guide holes 26; two ends of the upper first guide rod 25 are respectively fixedly connected with the upper two first guide blocks 24, and the upper first guide rod 25 respectively penetrates through the upper two first guide holes 26; both ends of the lower first guide rod 25 are fixedly connected with the lower two first guide blocks 24, respectively, and the lower first guide rod 25 passes through the lower two first guide holes 26, respectively (as shown in fig. 2). The first roller frame 22 moves along the first guide rod 25, so that the guiding function can be achieved, the angular deviation generated during the operation of the first roller frame 22 is reduced, and the centering precision is further improved.

A second guide block 34 is arranged on the left side and the right side of the second oil cylinder 31; a second guide rod 35 is arranged on the left side and the right side of the second clamping device 3; second guide holes 36 are formed in the left end and the right end of the second roller carrier 32; two ends of the left second guide rod 35 are respectively fixedly connected with the left two second guide blocks 34, and the left second guide rod 35 respectively passes through the left two second guide holes 36; the two ends of the right second guide rod 35 are fixedly connected to the right two second guide blocks 34, respectively, and the right second guide rod 35 passes through the right two second guide holes 36 (as shown in fig. 3). The second roller frame 32 moves along the second guide rod 35, so that a guiding effect can be achieved, the angular deviation generated during the operation of the second roller frame 32 is reduced, and the centering precision is further improved.

As a preferred embodiment, an oil supply device 15 is provided at the rear of the rotating disk 1, the oil supply device 15 includes an oil distribution ring 6 (as shown in fig. 9-13), and a first oil inlet 61 and a first oil outlet 62 are respectively provided on the outer side wall of the oil distribution ring 6 for connecting with an oil supply mechanism of the chuck for inputting and outputting corresponding oil. The inner side wall of the oil distribution ring 6 is respectively provided with an annular oil inlet groove 63 and an annular oil outlet groove 64, the first oil inlet 61 is communicated with the oil inlet groove 63 and used for inputting oil into the oil inlet groove 63, and the first oil outlet 62 is communicated with the oil outlet groove 64 and used for outputting the oil in the oil outlet groove 64.

And a rotating shaft 7 is movably arranged in the oil distribution ring 6 and is fixedly connected with the turntable 1 and drives the turntable 1 to rotate. A second workpiece machining hole 71 is formed in the center of the rotating shaft 7; and 4 oil supply assemblies 72 which are uniformly distributed along the circumferential direction are arranged on the rotating shaft 7 and are used for corresponding to 4 oil cylinders on the rotating disc 1. The oil supply assembly 72 comprises a second oil inlet 73, a second oil outlet 74, an oil inlet pipe 75 and an oil outlet pipe 76; the second oil inlet 73 and the second oil outlet 74 are located on the front side wall of the rotating shaft 7, and are respectively used for being connected with an oil inlet and an oil outlet of an oil cylinder on the chuck to input and output oil to and from the oil cylinder. The oil inlet pipe 75 and the oil outlet pipe 76 are positioned inside the rotating shaft 7, and the second oil inlet 73 is communicated with the oil inlet groove 63 through the oil inlet pipe 75, so that oil in the oil inlet groove 63 can be input into the oil cylinder of the chuck; the second oil outlet 74 is communicated with the oil outlet groove 64 through an oil outlet pipe 76, so that the oil of the chuck cylinder can be output to the oil outlet groove 64.

In the using process, the oil distribution ring 6 is fixed, the rotating shaft 7 rotates, the oil distribution ring 6 is arranged in an oil way and is kept static, so that the sealing performance is better, and an external oil supply mechanism can continuously supply oil to the oil cylinder on the rotating disc 1.

As a preferred embodiment, a plurality of annular seal grooves 65 are formed in the inner side wall of the oil distribution ring 6, a plurality of seal rings 77 corresponding to the seal grooves 65 are formed in the outer side wall of the rotating shaft 7, and the seal rings 77 are movably installed in the corresponding seal grooves 65. The oil way sealing device is used for sealing oil ways of the oil inlet groove 63 and the oil outlet groove 64 and ensuring that oil liquid does not leak.

As a preferred embodiment, the rotating shaft 7 is fixedly connected to the rotating disc 1, and is used for driving the rotating disc 1 to rotate. The rear part of the oil distribution ring 6 is provided with a supporting bearing 8, and the oil distribution ring 6 is fixedly connected with the outer ring of the supporting bearing 8, so that the oil distribution ring 6 can be kept fixed. A base 81 (shown in fig. 14) is fixedly connected to a lower portion of the outer ring of the support bearing 8, and the outer ring of the support bearing 8 is kept stationary. A driven gear 82 is arranged at the rear part of the support bearing 8, and the driven gear 82 is connected with the inner ring of the support bearing 8; a transmission case 83 is fixedly connected to the upper part of the outer ring of the support bearing 8, a driving gear is movably mounted in the transmission case 83, and the driving gear is meshed with the driven gear 82; a speed reducer 84 is arranged on the transmission case 83, and the speed reducer 84 is connected with a driving gear; the speed reducer 84 is connected with a servo motor 85, and the servo motor 85 drives the driving gear and the driven gear 82 to rotate, so as to further drive the turntable 1 to rotate and process the workpiece.

In a preferred embodiment, a protective cover 86 (shown in fig. 15) is provided at the front of the turntable 1 for protecting the equipment. A third workpiece machining hole 87 is provided in the protective cover 86 for machining a workpiece.

In summary, the hydraulic drive chuck of the utility model adopts a double-acting operation mode for the two groups of rollers, the two groups of rollers are started simultaneously without mutual interference and are respectively clamped, thus being suitable for clamping various abnormal-shaped workpieces; in addition, a mechanical centering mode of gear and rack meshing is adopted, each group of rollers are forced to move synchronously, and centering precision is improved; adopt hydraulic pressure as clamping power, improvement clamp force that can be very big, and the adjustment range of clamp force is great, easily realizes stepless speed regulation, and can adopt electric proportional control, is convenient for carry out intelligent control.

The parts of the present invention not described in detail are the known techniques of those skilled in the art. Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims

1. A hydraulically driven chuck comprising a turntable (1), characterized in that: a first workpiece machining hole (11) is formed in the center of the turntable (1);

a first clamping device (2) and a second clamping device (3) are respectively arranged on the front side of the turntable (1); the first clamping device (2) comprises two first oil cylinders (21) which are symmetrically distributed in the horizontal direction, piston rods of the first oil cylinders (21) are connected with first roller carriers (22), and the inner sides of the first roller carriers (22) are provided with first rollers (23);

the second clamping device (3) comprises two second oil cylinders (31) which are symmetrically distributed in the vertical direction, piston rods of the second oil cylinders (31) are connected with second roller carriers (32), and the inner sides of the second roller carriers (32) are provided with second rollers (33);

a cushion block (12) is arranged between the second oil cylinder (31) and the rotary table (1), and the second roller carrier (32) is positioned at the front part of the first roller carrier (22);

the upper part and the lower part of the first clamping device (2) are respectively provided with a synchronous centering device (13), and the two first roller carriers (22) are connected through the two synchronous centering devices (13);

synchronous centering devices (13) are arranged on the left side and the right side of the second clamping device (3), and the two second roller carriers (32) are connected through the two synchronous centering devices (13).

2. The hydraulically driven chuck as set forth in claim 1, wherein: the synchronous centering device (13) comprises a gear box (4), and a first installation cavity (41) is arranged inside the gear box (4); a synchronous gear (42) is arranged in the first mounting cavity (41), two ends of the synchronous gear (42) are respectively provided with a centering shaft (43), and the two centering shafts (43) are respectively movably mounted on the side wall of the gear box (4);

two centering through holes (44) are formed in the gear box (4), and the two centering through holes (44) are respectively positioned at the upper part and the lower part of the synchronous gear (42); two racks (14) are movably mounted in the two centering through holes (44), the two racks (14) are respectively meshed with the synchronous gear (42), and the two racks (14) are distributed in a central symmetry manner by taking the synchronous gear (42) as a circle center; two centering bearings (45) are arranged in the first mounting cavity (41), and the two centering bearings (45) are respectively sleeved on the two centering shafts (43).

3. The hydraulically driven chuck as set forth in claim 2, wherein: pre-tightening covers (5) are movably mounted at the upper end and the lower end of the first mounting cavity (41), and second mounting cavities (51) are arranged in the pre-tightening covers (5); a plurality of pre-tightening shafts (52) are movably mounted in the second mounting cavities (51), and a plurality of pre-tightening bearings (53) are sleeved on the pre-tightening shafts (52); the upper pre-tightening bearing (53) is contacted with the upper rack (14), and the lower pre-tightening bearing (53) is contacted with the lower rack (14).

4. The hydraulically driven chuck as set forth in claim 3, wherein: the upper part and the lower part of the gear box (4) are respectively provided with a plurality of threaded holes (46), and the pre-tightening cover (5) is respectively provided with a pre-tightening hole (54) corresponding to the threaded holes (46); the pre-tightening cover (5) is fixedly connected with the gear box (4) through screws (55), and the screws (55) respectively penetrate through the pre-tightening holes (54) and the threaded holes (46).

5. The hydraulically driven chuck as set forth in claim 2, wherein: the upper ends of the two first roller carriers (22) are respectively and fixedly connected with the two racks (14) of the upper synchronous centering device (13), and the lower ends of the two first roller carriers (22) are respectively and fixedly connected with the two racks (14) of the lower synchronous centering device (13); the left ends of the two second roller carriers (32) are respectively and fixedly connected with the two racks (14) of the left synchronous centering device (13), and the right ends of the two second roller carriers (32) are respectively and fixedly connected with the two racks (14) of the right synchronous centering device (13).

6. The hydraulically driven chuck as set forth in claim 2, wherein: the upper part and the lower part of the first oil cylinder (21) are provided with first guide blocks (24); the upper part and the lower part of the first clamping device (2) are provided with first guide rods (25); the upper end and the lower end of the first roller carrier (22) are provided with first guide holes (26); two ends of the first guide rod (25) at the upper part are respectively fixedly connected with the two first guide blocks (24) at the upper part, and the first guide rod (25) at the upper part respectively penetrates through the two first guide holes (26) at the upper part; two ends of a first guide rod (25) at the lower part are respectively fixedly connected with two first guide blocks (24) at the lower part, and the first guide rod (25) at the lower part respectively penetrates through two first guide holes (26) at the lower part;

a second guide block (34) is arranged on the left side and the right side of the second oil cylinder (31); a second guide rod (35) is arranged on the left side and the right side of the second clamping device (3); the left end and the right end of the second roller carrier (32) are both provided with a second guide hole (36); two ends of the left second guide rod (35) are respectively fixedly connected with the left two second guide blocks (34), and the left second guide rod (35) respectively penetrates through the left two second guide holes (36); two ends of the right second guide rod (35) are respectively fixedly connected with the right two second guide blocks (34), and the right second guide rod (35) respectively penetrates through the right two second guide holes (36).

7. The hydraulically driven chuck as set forth in claim 1, wherein: an oil supply device (15) is arranged at the rear part of the turntable (1), the oil supply device (15) comprises an oil distribution ring (6), and a first oil inlet (61) and a first oil outlet (62) are respectively arranged on the outer side wall of the oil distribution ring (6); the inner side wall of the oil distribution ring (6) is respectively provided with an annular oil inlet groove (63) and an annular oil outlet groove (64), the first oil inlet (61) is communicated with the oil inlet groove (63), and the first oil outlet (62) is communicated with the oil outlet groove (64);

a rotating shaft (7) is movably arranged in the oil distribution ring (6), and a second workpiece machining hole (71) is formed in the center of the rotating shaft (7); 4 oil supply assemblies (72) which are uniformly distributed along the circumferential direction are arranged on the rotating shaft (7), and each oil supply assembly (72) comprises a second oil inlet (73), a second oil outlet (74), an oil inlet pipe (75) and an oil outlet pipe (76); the second oil inlet (73) and the second oil outlet (74) are positioned on the front side wall of the rotating shaft (7); the oil inlet pipe (75) and the oil outlet pipe (76) are located inside the rotating shaft (7), the second oil inlet (73) is communicated with the oil inlet groove (63) through the oil inlet pipe (75), and the second oil outlet (74) is communicated with the oil outlet groove (64) through the oil outlet pipe (76).

8. The hydraulically driven chuck as set forth in claim 7, wherein: be equipped with a plurality of ring shape seal grooves (65) on the inside wall of oil distribution ring (6) be equipped with a plurality of sealing washer (77) that correspond with seal groove (65) on the lateral wall of pivot (7), sealing washer (77) movable mounting is in seal groove (65) that correspond.

9. The hydraulically driven chuck as set forth in claim 7, wherein: the rotating shaft (7) is fixedly connected with the turntable (1); a supporting bearing (8) is arranged at the rear part of the oil distribution ring (6), and the oil distribution ring (6) is fixedly connected with the outer ring of the supporting bearing (8); a base (81) is fixedly connected to the lower part of the outer ring of the support bearing (8); a driven gear (82) is arranged at the rear part of the supporting bearing (8), and the driven gear (82) is connected with the inner ring of the supporting bearing (8); a transmission case (83) is fixedly connected to the upper part of the outer ring of the support bearing (8), a driving gear is movably mounted in the transmission case (83), and the driving gear is meshed with a driven gear (82); a speed reducer (84) is arranged on the transmission case (83), and the speed reducer (84) is connected with the driving gear; the speed reducer (84) is connected with a servo motor (85).

10. The hydraulically driven chuck as set forth in claim 9, wherein: the front part of the turntable (1) is provided with a protective cover (86), and the protective cover (86) is provided with a third workpiece machining hole (87).