A hydraulic clamping device

Abstract

The present invention provides a hydraulic clamping device, which relates to the technical field of fixtures; the hydraulic clamping device includes: a clamping mechanism, a first oil delivery assembly, a second oil delivery assembly, and a four-axis turntable; the first oil delivery assembly is arranged on the turntable of the four-axis turntable; the clamping mechanism includes a transition flange and a plurality of hydraulic collet assemblies; the transition flange is connected to the first oil delivery assembly; the second oil delivery assembly includes an oil guiding rod and an oil delivery sleeve; a first oil delivery channel and a second oil delivery channel are arranged inside the oil guiding rod, and are respectively communicated with the oil circuits of the hydraulic collet assemblies through the first oil delivery assembly; one end of the oil guiding rod is connected to the first oil delivery assembly, and the other end is inserted into the oil delivery sleeve; a first annular oil guiding groove and a second annular oil guiding groove are arranged on the inner side of the oil delivery sleeve, and a first oil delivery hole and a second oil delivery hole are arranged on the outer side wall, and are respectively communicated with the first oil delivery channel and the second oil delivery channel through the first annular oil guiding groove and the second annular oil guiding groove; the present invention can clamp a plurality of workpieces simultaneously.

Description

Technical Field

[0001] The present invention relates to the field of fixtures, and particularly to a hydraulic clamping device. Background Art

[0002] A collet is a locking device for a shaft or other shaft-shaped workpiece, usually used in the machining process of a shaft or shaft-shaped workpiece. In the existing clamping device using a collet, there is only one set of collet mechanism; wherein, the collet mechanism generally includes a collet, a locking sleeve and a hydraulic cylinder. The collet is movably arranged inside the locking sleeve, and the telescopic rod of the hydraulic cylinder is connected to the collet for driving the collet to move inside the locking sleeve, so that the collet and the locking sleeve cooperate to clamp the workpiece. During use, the clamping device can only clamp one workpiece at a time, with low working efficiency and inconvenient use. Summary of the Invention

[0003] The present invention aims to solve the technical problem that the existing hydraulic clamping device can only clamp one workpiece at a time, resulting in low working efficiency.

[0004] The present invention provides a hydraulic clamping device, comprising: a clamping mechanism, a first oil delivery assembly, a second oil delivery assembly and a four-axis turntable;

[0005] A central through hole is axially arranged on the four-axis turntable;

[0006] The first oil delivery assembly is fixedly arranged on the turntable of the four-axis turntable;

[0007] The clamping mechanism includes a transition flange and a plurality of hydraulic collet assemblies penetrating through the transition flange; the transition flange is fixedly connected to the first oil delivery assembly;

[0008] The second oil delivery assembly includes an oil guiding rod and an oil delivery sleeve; the oil guiding rod penetrates through the central through hole; a first oil delivery channel and a second oil delivery channel are arranged inside the oil guiding rod; the first oil delivery channel and the second oil delivery channel are respectively communicated with the first oil inlet hole and the second oil inlet hole of the hydraulic collet assembly through the first oil delivery assembly; one end of the oil guiding rod is fixedly connected to the first oil delivery assembly, and the other end is rotatably inserted into the oil delivery sleeve; a first annular oil guiding groove and a second annular oil guiding groove are arranged on the inner side wall of the oil delivery sleeve, and a first oil delivery hole and a second oil delivery hole for communicating with an external hydraulic system are arranged on the outer side wall; the first oil delivery hole and the second oil delivery hole are respectively communicated with the first oil delivery channel and the second oil delivery channel through the first annular oil guiding groove and the second annular oil guiding groove.

[0009] Further, the first oil delivery assembly includes a connecting plate, an oil passage transition plate, and a connecting column; the connecting plate is fixedly connected to the turntable of the four-axis turntable; the oil passage transition plate is disposed on one side of the transition flange; one end of the connecting column is fixedly disposed on one side of the connecting plate; the transition flange is fixedly connected to the connecting plate such that the oil passage transition plate abuts against the other end of the connecting column; the connecting plate is provided with a first through hole and a second through hole; the connecting column is provided with a third oil delivery channel and a fourth oil delivery channel; the oil passage transition plate is respectively provided with a plurality of fifth oil delivery channels and sixth oil delivery channels communicating with the first oil inlet hole and the second oil inlet hole; the first oil delivery channel is sequentially communicated with the first oil inlet hole through the first through hole, the third oil delivery channel, and the fifth oil delivery channel; the second oil delivery channel is sequentially communicated with the second oil inlet hole through the second through hole, the fourth oil delivery channel, and the sixth oil delivery channel.

[0010] Further, the first oil delivery assembly further includes a housing, and the housing is a cylindrical structure with both ends open; one end of the housing is fixedly connected to one side of the connecting plate, and the other end is connected to the transition flange by a stop.

[0011] Further, the hydraulic collet assembly includes an elastic collet, a locking sleeve, and a hydraulic cylinder; the transition flange is provided with a mounting through hole; the locking sleeve and the hydraulic cylinder are coaxially disposed at both ends of the mounting through hole and are respectively fixedly connected to the transition flange; the elastic collet is movably inserted into the locking sleeve and is fixedly connected to the piston rod of the hydraulic cylinder through a connecting member; the connecting member is located in the mounting through hole; the elastic collet and the locking sleeve cooperate to clamp a workpiece; the hydraulic cylinder is used to drive the elastic collet to move back and forth along the axial direction of the locking sleeve; the first oil inlet hole and the second oil inlet hole are respectively disposed on the hydraulic cylinder for introducing hydraulic oil into the interior of the hydraulic cylinder.

[0012] Further, one end of the elastic collet is provided with a connecting portion; one end of the connecting member is provided with a stud; one end of the piston rod is provided with a threaded mounting hole for cooperating with the stud; one end of the connecting member is connected to the connecting portion, and the other end is threadedly connected to the piston rod through the stud.

[0013] Further, a guiding groove is provided on the outer side wall of the connecting portion, and the guiding groove is arranged along the axial direction of the locking sleeve; a limiting bolt is penetratingly arranged on the side wall of the locking sleeve; the limiting bolt is threadedly connected to the locking sleeve; the limiting bolt cooperates with the guiding groove to prevent the elastic collet from rotating relative to the locking sleeve.

[0014] Further, an annular limiting cover plate is detachably arranged at one end of the locking sleeve for preventing the elastic collet from falling off from the locking sleeve.

[0015] Further, the hydraulic clamping device further comprises a mounting plate; the four-axis turntable is fixedly arranged on the mounting plate.

[0016] Further, the hydraulic clamping device further comprises a connecting flange; the first oil delivery assembly is fixedly connected with the turntable of the four-axis turntable through the connecting flange.

[0017] Further, the second oil delivery assembly further comprises a fixing member; the oil delivery sleeve is fixedly connected with the housing of the four-axis turntable through the fixing member.

[0018] The beneficial effects brought by the technical solution provided by the embodiment of the present invention are as follows: The hydraulic clamping device in the embodiment of the present invention integrates a plurality of hydraulic collet assemblies on the transition flange, and through the first oil delivery assembly and the second oil delivery assembly, the first oil inlet holes and the second oil inlet holes on each hydraulic collet assembly are connected with an external hydraulic system, so that a plurality of workpieces can be clamped simultaneously, improving the clamping efficiency of the workpieces; in addition, by selecting a four-axis turntable with a central through hole as the rotation driving device of the clamping mechanism, arranging the oil guiding rod through the central through hole, fixedly connecting one end of the oil guiding rod with the first oil delivery assembly, and movably inserting the other end into the oil delivery sleeve, when the clamping mechanism and the first oil delivery assembly rotate with the turntable of the four-axis turntable, the oil guiding rod can rotate with the first oil delivery assembly and is communicated with the external hydraulic system through the oil delivery sleeve, effectively overcoming the technical problem of oil pipeline entanglement when a plurality of hydraulic collet assemblies rotate with the four-axis turntable, and the structure is compact. Description of the Drawings

[0019] Figure 1 is a three-dimensional structural schematic diagram of the hydraulic clamping device in an embodiment of the present invention;

[0020] Figure 2 is Figure 1 the top view of the hydraulic clamping device in

[0021] Figure 3 is Figure 2 the sectional structural schematic diagram of the hydraulic clamping device in the A-A direction;

[0022] Figure 4 is Figure 1 the combined structural schematic diagram of the clamping mechanism 5, the first oil delivery assembly 4 and the second oil delivery assembly 6 in the hydraulic clamping device;

[0023] Figure 5 is Figure 1 the top view of the second oil delivery assembly 6 in the hydraulic clamping device;

[0024] Figure 6 is Figure 5 Schematic cross-sectional structure diagram in the C-C direction of the second oil delivery assembly 6;

[0025] Figure 7 is Figure 1 Top view of the first oil delivery assembly 4 in the hydraulic clamping device;

[0026] Figure 8 is Figure 7 Schematic cross-sectional structure diagram in the H-H direction of the first oil delivery assembly 4;

[0027] Figure 9 is Figure 8 Schematic three-dimensional structure diagram of the oil path transition plate 43 in the first oil delivery assembly 4;

[0028] Figure 10 is Figure 9 Side view of the oil path transition plate 43;

[0029] Figure 11 is Figure 10 Schematic cross-sectional structure diagram in the D-D direction of the oil path transition plate 43;

[0030] Figure 12 is Figure 10 Schematic cross-sectional structure diagram in the E-E direction of the oil path transition plate 43;

[0031] Figure 13 is Figure 9 Front view of the oil path transition plate 43;

[0032] Figure 14 is Figure 13 Schematic cross-sectional structure diagram in the F-F direction of the oil path transition plate 43;

[0033] Figure 15 is Figure 1 Schematic three-dimensional structure diagram of the clamping mechanism 5 in the hydraulic clamping device;

[0034] Figure 16 is Figure 15 Combined structure diagram of the transition flange 51 and the oil path transition plate 43 in the clamping mechanism 5;

[0035] Figure 17 is Figure 15 Schematic three-dimensional structure diagram of the transition flange 51 in the clamping mechanism 5;

[0036] Figure 18 is Figure 15 Schematic three-dimensional structure diagram of the hydraulic collet assembly 52 in the clamping mechanism 5;

[0037] Figure 19 is Figure 18Side view of the hydraulic collet assembly 52;

[0038] Figure 20 Is Figure 19 Schematic cross-sectional structure diagram of the hydraulic collet assembly 52 in the B-B direction;

[0039] Figure 21 Is Figure 18 Exploded structure diagram of the hydraulic collet assembly 52;

[0040] Figure 22 Is Figure 21 Schematic three-dimensional structure diagram of the elastic collet 524 in the hydraulic collet assembly 52;

[0041] Figure 23 Is Figure 21 Schematic three-dimensional structure diagram of the connecting member 522 in the hydraulic collet assembly 52;

[0042] Figure 24 Is Figure 21 Front view of the hydraulic cylinder 521 in the hydraulic collet assembly 52;

[0043] Figure 25 Is Figure 24 Schematic cross-sectional structure diagram of the hydraulic cylinder 521 in the G-G direction;

[0044] Among them, 1. mounting plate; 2. four-axis turntable; 21. central through hole; 3. connecting flange; 4. first oil delivery assembly; 41. connecting plate; 411. first through hole; 412. second through hole; 42. connecting column; 421. third oil delivery channel; 422. fourth oil delivery channel; 43. oil path transition plate; 431. fifth oil delivery channel; 432. sixth oil delivery channel; 433. first mounting groove; 44. housing; 5. clamping mechanism; 51. transition flange; 511. mounting through hole; 512. second mounting groove; 52. hydraulic collet assembly; 521. hydraulic cylinder; 5211. first oil inlet hole; 5212. second oil inlet hole; 5213. piston rod; 5214. threaded mounting hole; 522. connecting member; 5221. stud; 523. locking sleeve; 5231. limit bolt; 524. elastic collet; 5241. connecting portion; 5242. guiding groove; 525. annular limiting cover plate; 6. second oil delivery assembly; 61. oil guiding rod; 611. first oil delivery channel; 612. second oil delivery channel; 62. oil delivery sleeve; 621. first oil delivery hole; 622. second oil delivery hole; 623. first annular oil guiding groove; 624. second annular oil guiding groove; 63. fixing member; 7. workpiece. Detailed implementation manners

[0045] The preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings. The accompanying drawings form a part of this application and are used together with the embodiments of the present invention to explain the principles of the present invention, rather than to limit the scope of the present invention.

[0046] Please refer to Figures 1 to 6 , an embodiment of the present invention provides a hydraulic clamping device, including: a clamping mechanism 5, a first oil delivery component 4, a second oil delivery component 6, and a four-axis turntable 2;

[0047] A central through hole 21 is axially provided in the four-axis turntable 2; the four-axis turntable 2 is used to drive the clamping mechanism 5 to rotate, changing the position of the workpiece 7 clamped on the clamping mechanism 5, so as to facilitate the machining of the workpiece 7 clamped on the clamping mechanism 5;

[0048] The first oil delivery component 4 is fixedly arranged on the turntable of the four-axis turntable 2;

[0049] The clamping mechanism 5 includes a transition flange 51 and a plurality of hydraulic collet assemblies 52 penetrating through the transition flange 51; the transition flange 51 is fixedly connected to the first oil delivery component 4;

[0050] The second oil delivery component 6 includes an oil guiding rod 61 and an oil delivery sleeve 62; the oil guiding rod 61 penetrates through the central through hole 21; a first oil delivery channel 611 and a second oil delivery channel 612 are arranged inside the oil guiding rod 61; the first oil delivery channel 611 and the second oil delivery channel 612 are respectively communicated with the first oil inlet hole 5211 and the second oil inlet hole 5212 of the hydraulic collet assembly 52 through the first oil delivery component 4; one end of the oil guiding rod 61 is fixedly connected to the first oil delivery component 4, and the other end is rotatably inserted into the oil delivery sleeve 62; a first annular oil guiding groove 623 and a second annular oil guiding groove 624 are arranged on the inner side wall of the oil delivery sleeve 62, and a first oil delivery hole 621 and a second oil delivery hole 622 for communicating with an external hydraulic system are arranged on the outer side wall; the first oil delivery hole 621 and the second oil delivery hole 622 are respectively communicated with the first oil delivery channel 611 and the second oil delivery channel 612 through the first annular oil guiding groove 623 and the second annular oil guiding groove 624.

[0051] It should be noted that the four-axis turntable 2 with an axial central through hole 21 is a prior art, so its specific structure will not be described in detail here.

[0052] Refer to Figure 1 and Figure 3 , the hydraulic clamping device further includes a mounting plate 1 and a connecting flange 3; the four-axis turntable 2 is fixedly arranged on the mounting plate 1; the first oil delivery component 4 is fixedly connected to the turntable of the four-axis turntable 2 through the connecting flange 3.

[0053] Refer to Figure 3 and Figure 6, the second oil delivery assembly 6 further includes a fixing member 63; one end of the fixing member 63 is fixedly arranged on the oil delivery sleeve 62, and the other end is fixedly connected to the housing of the four-axis turntable 2, so that the oil delivery sleeve 62 will not rotate with the oil guiding rod 61; the first oil delivery hole 621 and the second oil delivery hole 622 on the oil delivery sleeve 62 are respectively communicated with the pipelines of the external hydraulic system, and the external hydraulic oil is introduced into the first oil delivery channel 611 and the second oil delivery channel 612 through the first annular oil guiding groove 623 and the second annular oil guiding groove 624.

[0054] Reference Figures 7 to 14 , the first oil delivery assembly 4 includes a connecting plate 41, an oil path transition plate 43 and a connecting column 42; one side of the connecting flange 3 is fixedly connected to the turntable of the four-axis turntable 2, and the other side is fixedly connected to the connecting plate 41; the oil path transition plate 43 is arranged on one side of the transition flange 51; one end of the connecting column 42 is fixedly arranged on one side of the connecting plate 41; the transition flange 51 is fixedly connected to the connecting plate 41, so that the oil path transition plate 43 abuts against the other end of the connecting column 42; a first installation groove 433 is arranged on the oil path transition plate 43; one end of the connecting column 42 is inserted into the first installation groove 433 and abuts against the bottom of the first installation groove 433; a first through hole 411 and a second through hole 412 are arranged on the connecting plate 41; a third oil delivery channel 421 and a fourth oil delivery channel 422 are arranged on the connecting column 42; a plurality of fifth oil delivery channels 431 and sixth oil delivery channels 432 respectively communicated with the first oil inlet hole 5211 and the second oil inlet hole 5212 are arranged on the oil path transition plate 43; the oil inlets of the fifth oil delivery channels 431 and the sixth oil delivery channels 432 are respectively arranged in the first installation groove 433; the first oil delivery channel 611 is sequentially communicated with the first oil inlet hole 5211 through the first through hole 411, the third oil delivery channel 421 and the fifth oil delivery channel 431; the second oil delivery channel 612 is sequentially communicated with the second oil inlet hole 5212 through the second through hole 412, the fourth oil delivery channel 422 and the sixth oil delivery channel 432.

[0055] Reference Figure 3 and Figure 8 , the first oil delivery assembly 4 further includes a housing 44, and the housing 44 is a cylindrical structure with openings at both ends; one end of the housing 44 is fixedly connected to one side of the connecting plate 41, and the other end is connected to the transition flange 51 by a rabbet; the housing 44 is welded to the connecting plate 41.

[0056] Reference Figures 15 to 21, the hydraulic collet assembly 52 includes an elastic collet 524, a locking sleeve 523 and a hydraulic cylinder 521; the transition flange 51 is provided with a mounting through hole 511 and a second mounting groove 512; the oil circuit transition plate 43 is embedded in the second mounting groove 512 and is fixedly connected to the transition flange 51 by bolts; the locking sleeve 523 and the hydraulic cylinder 521 are coaxially arranged at both ends of the mounting through hole 511 and are respectively fixedly connected to the transition flange 51 by bolts; the elastic collet 524 is movably inserted into the locking sleeve 523 and is fixedly connected to the piston rod 5213 of the hydraulic cylinder 521 through a connecting member 522; the connecting member 522 is located in the mounting through hole 511; the elastic collet 524 and the locking sleeve 523 cooperate to clamp the workpiece 7; the hydraulic cylinder 521 is used to drive the elastic collet 524 to move back and forth along the axial direction of the locking sleeve 523; a first oil inlet hole 5211 and a second oil inlet hole 5212 are respectively arranged on the hydraulic cylinder 521 for introducing hydraulic oil into the interior of the hydraulic cylinder 521; during use, the workpiece 7 is placed in the elastic collet 524, and the elastic collet 524 is driven by the hydraulic cylinder 521 to move inward until the side wall contracts, so as to clamp the workpiece 7; when the workpiece 7 needs to be taken out, the elastic collet 524 is driven by the hydraulic cylinder 521 to move outward until the side wall expands, and then the workpiece 7 can be taken out, which is convenient to use.

[0057] It should be noted that the first oil inlet hole 5211 has the functions of oil inlet and oil outlet; similarly, the second oil inlet hole 5212 has the functions of oil inlet and oil outlet; when the first oil inlet hole 5211 intakes oil, the second oil inlet hole 5212 discharges oil; when the second oil inlet hole 5212 intakes oil, the first oil inlet hole 5211 discharges oil; the working principle of the hydraulic cylinder 521 is prior art, so the specific internal structure thereof will not be described in detail here.

[0058] Exemplarily, in this embodiment, in order to facilitate the first oil inlet hole 5211 and the second oil inlet hole 5212 to communicate with the fifth oil transmission channel 431 and the sixth oil transmission channel 432 on the oil circuit transition plate 43 respectively, the first oil inlet hole 5211 and the second oil inlet hole 5212 are opened on the end surface of the piston rod 5213 output from the hydraulic cylinder 521 and extend into the interior of the hydraulic cylinder 521 respectively; the fifth oil transmission channel 431 on the oil circuit transition plate 43 is a one-in-six-out channel structure, and the oil inlet and the oil outlet are both located on the end surface of the oil circuit transition plate 43 and on the same side; the sixth oil transmission channel 432 on the oil circuit transition plate 43 is a one-in-six-out channel structure, and the oil inlet and the oil outlet are both located on the end surface of the oil circuit transition plate 43 and on the same side; the number of the hydraulic collet assemblies 52 is six groups, that is, the number of the hydraulic cylinders 521 is six, and they are respectively communicated with the fifth oil transmission channel 431 and the sixth oil transmission channel 432 through the first oil inlet hole 5211 and the second oil inlet hole 5212; it can be understood that the number of the oil outlets on the fifth oil transmission channel 431 and the sixth oil transmission channel 432 is determined according to the number of the hydraulic cylinders 521.

[0059] Reference Figure 22 and Figure 23 , one end of the elastic collet 524 is provided with a connecting portion 5241; one end of the connecting member 522 is provided with a stud 5221; one end of the piston rod 5213 is provided with a threaded mounting hole 5214 for cooperating with the stud 5221; one end of the connecting member 522 is connected to the connecting portion 5241, and the other end is threadedly connected to the piston rod 5213 through the stud 5221.

[0060] Reference Figure 18 and Figure 22 , in order to prevent the relative rotation of the elastic collet 524 and the locking sleeve 523, a guide groove 5242 is provided on the outer side wall of the connecting portion 5241, and the guide groove 5242 is arranged along the axial direction of the locking sleeve 523; a limit bolt 5231 is penetrated through the side wall of the locking sleeve 523; the limit bolt 5231 is threadedly connected to the locking sleeve 523; one end of the limit bolt 5231 extends into the guide groove 5242.

[0061] Reference Figure 20 , in order to prevent the elastic collet 524 from moving out of the locking sleeve 523 and falling off, a ring-shaped limit cover plate 525 is detachably provided at one end of the locking sleeve 523; the ring-shaped limit cover plate 525 is detachably connected to one end of the locking sleeve 523 through a bolt; during use, the workpiece 7 is inserted into the elastic collet 524 through the through hole in the middle of the ring-shaped limit plate.

[0062] For the parts not involved above, the prior art is applicable.

[0063] In this article, the front, back, up, down and other orientation words are defined based on the positions of the components in the drawings and the positions of the components relative to each other, only for the clarity and convenience of expressing the technical solution. It should be understood that the use of the orientation words should not limit the scope of protection claimed in this application.

[0064] Without conflict, the above-mentioned embodiments and the features in the embodiments in this article can be combined with each other.

[0065] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hydraulic clamping device, characterized in that, Including: A clamping mechanism, a first oil delivery assembly, a second oil delivery assembly, and a four-axis turntable; A central through hole is axially provided on the four-axis turntable; The first oil delivery assembly is fixedly arranged on the turntable of the four-axis turntable; The clamping mechanism includes a transition flange and a plurality of hydraulic collet assemblies penetrating through the transition flange; the transition flange is fixedly connected to the first oil delivery assembly; The second oil delivery assembly includes an oil guiding rod and an oil delivery sleeve; the oil guiding rod penetrates through the central through hole; a first oil delivery channel and a second oil delivery channel are arranged inside the oil guiding rod; the first oil delivery channel and the second oil delivery channel are respectively communicated with a first oil inlet hole and a second oil inlet hole of the hydraulic collet assembly through the first oil delivery assembly; one end of the oil guiding rod is fixedly connected to the first oil delivery assembly, and the other end is rotatably inserted into the oil delivery sleeve; a first annular oil guiding groove and a second annular oil guiding groove are arranged on the inner side wall of the oil delivery sleeve, and a first oil delivery hole and a second oil delivery hole for communicating with an external hydraulic system are arranged on the outer side wall; the first oil delivery hole and the second oil delivery hole are respectively communicated with the first oil delivery channel and the second oil delivery channel through the first annular oil guiding groove and the second annular oil guiding groove; The first oil delivery assembly includes a connecting plate, an oil path transition plate, and a connecting column; the connecting plate is fixedly connected to the turntable of the four-axis turntable; the oil path transition plate is arranged on one side of the transition flange; one end of the connecting column is fixedly arranged on one side of the connecting plate; the transition flange is fixedly connected to the connecting plate, so that the oil path transition plate abuts against the other end of the connecting column; a first through hole and a second through hole are arranged on the connecting plate; a third oil delivery channel and a fourth oil delivery channel are arranged on the connecting column; a plurality of fifth oil delivery channels and sixth oil delivery channels respectively communicated with the first oil inlet hole and the second oil inlet hole are arranged on the oil path transition plate; the first oil delivery channel is sequentially communicated with the first oil inlet hole through the first through hole, the third oil delivery channel, and the fifth oil delivery channel; the second oil delivery channel is sequentially communicated with the second oil inlet hole through the second through hole, the fourth oil delivery channel, and the sixth oil delivery channel; an installation plate is also included; the four-axis turntable is fixedly arranged on the installation plate.

2. The hydraulic clamping device according to claim 1, characterized in that, The first oil delivery assembly further includes a housing, and the housing is a cylindrical structure with both ends open; one end of the housing is fixedly connected to one side of the connecting plate, and the other end is connected to the transition flange by a rabbet joint.

3. The hydraulic clamping device according to claim 1, wherein, The hydraulic collet assembly includes an elastic collet, a locking sleeve, and a hydraulic cylinder; an installation through-hole is provided on the transition flange; the locking sleeve and the hydraulic cylinder are coaxially arranged at both ends of the installation through-hole and are respectively fixedly connected to the transition flange; the elastic collet is movably inserted into the locking sleeve and is fixedly connected to the piston rod of the hydraulic cylinder through a connecting piece; the connecting piece is located in the installation through-hole; the elastic collet and the locking sleeve cooperate to clamp a workpiece; the hydraulic cylinder is used to drive the elastic collet to move back and forth along the axial direction of the locking sleeve; the first oil inlet hole and the second oil inlet hole are respectively arranged on the hydraulic cylinder for introducing hydraulic oil into the interior of the hydraulic cylinder.

4. The hydraulic clamping device according to claim 3, characterized in that, One end of the elastic collet is provided with a connecting portion; one end of the connecting piece is provided with a stud; one end of the piston rod is provided with a threaded installation hole that cooperates with the stud; one end of the connecting piece is connected to the connecting portion, and the other end is threadedly connected to the piston rod through the stud.

5. The hydraulic clamping device according to claim 4, wherein A guiding groove is provided on the outer sidewall of the connecting portion, and the guiding groove is arranged along the axial direction of the locking sleeve; a limiting bolt is penetrated through the sidewall of the locking sleeve; the limiting bolt is threadedly connected to the locking sleeve; the limiting bolt cooperates with the guiding groove to prevent the elastic collet from rotating relative to the locking sleeve.

6. The hydraulic clamping device according to claim 3, wherein, A ring-shaped limiting cover plate is detachably arranged at one end of the locking sleeve to prevent the elastic collet from falling off from the locking sleeve.

7. The hydraulic clamping device according to claim 1, characterized in that, It further includes a connecting flange; the first oil delivery assembly is fixedly connected to the turntable of the four-axis turntable through the connecting flange.

8. The hydraulic clamping device according to claim 1, characterized in that, The second oil delivery assembly further includes a fixing member; the oil delivery sleeve is fixedly connected to the housing of the four-axis turntable through the fixing member.

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