A hydraulic clamp

Abstract

The present invention relates to a hydraulic clamp, which belongs to the hydraulic clamp of a horizontal machining center. A trapezoidal clamping device, a supporting positioning device, and a fork-shaped clamping device are respectively fixed on a basic device, and a hook-shaped clamping device, a limiting device, and a reset device are respectively installed on the supporting positioning device. The advantages are that the clamping surface is selected on the left and right planes behind the workpiece, which is a solid and will not cause elastic recovery deformation of the machining surface affected by the clamping force; the two sides of the workpiece are clamped synchronously and symmetrically by using a curved back clamp, which is accurate in positioning, and the relative position accuracy of each surface is high, and will not cause elastic deformation after processing; the workpiece can complete multiple processes by clamping it once, namely, the opening groove, semi-circular arc surface, mounting holes on both sides, end face and main hole processing, which improves production efficiency, improves product quality, and reduces the labor intensity of employees.

Description

Technical Field

[0001] The invention belongs to a hydraulic clamp for a horizontal machining center. Background Art

[0002] The machining center can achieve multi-axis linkage through computer program control and has linear and circular interpolation functions. It can realize face milling, contour milling, surface milling, centering, drilling, reaming, boring, internal hole milling, internal and external groove milling, tapping, internal and external thread milling functions. It can process various complex parts such as boxes, molds, valve bodies, etc., and plays an important role in the production of deformed and complex parts.

[0003] In the production process, if the fixture design is unreasonable, the process will be scattered, the clamping surface will be set unreasonable, elastic deformation will occur, the size will exceed, and the workpiece will be scrapped. Designing a fixture to merge the scattered processes together can not only improve production efficiency, but also improve product quality and reduce the labor intensity of employees. Summary of the invention

[0004] The invention provides a hydraulic clamp, which uses a medium to enable the clamp to adopt a downward pushing, upward pressing and symmetrical clamping method for a workpiece, so that the workpiece is not affected by the clamping force to cause elastic deformation after processing, and multiple processes can be completed by one clamping.

[0005] The technical solution adopted by the present invention is to include a basic device, a trapezoidal clamping device, a supporting and positioning device, a hook-shaped clamping device, a limiting device, a fork-shaped pressing device, and a resetting device, wherein the trapezoidal clamping device, the supporting and positioning device, and the fork-shaped pressing device are respectively fixed on the basic device, and the hook-shaped clamping device, the limiting device, and the resetting device are respectively installed on the supporting and positioning device.

[0006] The basic device described in the present invention includes a basic plate, which includes a countersunk hole, a cylindrical hole, a threaded hole one, a threaded hole two, a threaded hole three, and an oil circuit island. The oil circuit island is fixed to the front end of the basic plate through the threaded hole three by using three groups of bolts one, and a two-way control valve is provided on it. The valve is fixed through the threaded hole of the oil circuit island by using a sealing cover and bolt two. The oil circuit hole of the two-way control valve is connected to the oil circuit hole of the oil circuit island. Quick-plug connector one and quick-plug connector two are respectively fixed to the threaded holes on both sides of the front of the oil circuit island. The ferrule connector one is installed at the right end of the oil circuit island, and the connected oil pipe one and the three-way connector one, the two ferrule connector two, the three ferrule connector four form a right-side oil circuit system. The ferrule connector five is installed at the left end of the oil circuit island. The connected oil pipe two and the three-way connector two, the six ferrule connector six, the seven ferrule connector eight form a left-side oil circuit system. The cylindrical pin is installed in the cylindrical hole of the basic plate to limit the displacement of the supporting positioning seat on the basic plate. The bolt three is used for connection with the supporting positioning device.

[0007] The trapezoidal clamping device of the present invention comprises a straight hydraulic cylinder, a piston rod, a threaded step shaft, a trapezoidal slider, a trapezoidal slider countersunk hole, a trapezoidal slider inclined surface 1, a trapezoidal slider inclined surface 2, a bolt 4, and a bolt 5, wherein the straight hydraulic cylinder is fixedly mounted with a threaded hole 1 of a base plate through four groups of bolts 5 near the oil circuit island, a ferrule joint 4 is installed with the upper threaded hole of the straight hydraulic cylinder, and a ferrule joint 8 is installed with the lower threaded hole, one end of the threaded step shaft is fastened in the threaded hole of the hydraulic cylinder piston rod, and the other end is fixedly mounted with the trapezoidal slider.

[0008] The supporting and positioning device described in the present invention includes a supporting and positioning seat, and the supporting and positioning seat includes a supporting surface and a tooth-shaped surface 1 and a tooth-shaped surface 2 for mounting a workpiece. The supporting and positioning seat is positioned on the base plate by a cylindrical pin, and is fixed by six groups of bolts through a countersunk hole through a threaded hole 4. The straight hydraulic cylinder of the trapezoidal clamping device is arranged in the groove below the supporting and positioning seat, and the piston rod extends through the middle hole of the lower groove and the upper groove to the semicircular hole of the upper groove and produces a sliding fit; the trapezoidal slider countersunk hole of the trapezoidal slider is connected to the other end of the threaded step shaft and is fastened with bolt 4, the bottom surface is in contact with the end surface of the piston rod, and the front and rear parallel surfaces are in sliding contact with the upper groove of the supporting and positioning seat. The curved back clamp 1 and the curved back clamp 2 are respectively arranged on both sides of the upper groove of the supporting and positioning seat, and are respectively fixed with steps through the left and right cylindrical pin holes 1 and the cylindrical pin holes 2. The cam face 1 and the cam face 2 are respectively in sliding contact with the inclined surface 1 and the inclined surface 2 of the trapezoidal slider, and the trapezoidal slider pushes the cam face 1 and the cam face 2 to rotate along the step axis respectively when the trapezoidal slider moves upward, and the jaw tooth surface 1 and the jaw tooth surface 2 are used to simultaneously contact the surface 1 and the surface symmetrically clamp the workpiece; the threaded step holes below the tooth-shaped supporting surface 1 and the tooth-shaped supporting surface 2 are respectively provided with a round head sliding rod, a spring 1 and a threaded plug, and the opposite surface bosses are respectively fixed with threaded locating pins, and the middle ferrule joint 2 and the ferrule joint 6 of the oil circuit system are respectively fixed with the oil circuit threaded hole 1 and the oil circuit threaded hole 2 of the supporting locating seat, and the medium enters the hydraulic cylinder through the oil hole 1, the hydraulic cylinder oil hole 1 and the oil hole 2, and the hydraulic cylinder oil hole 2, and the hook-shaped pressure head is executed to tighten and loosen the workpiece.

[0009] The hook-shaped tightening device of the present invention includes: a hook-shaped lever hydraulic cylinder is installed in a blind hole of a groove of a supporting positioning seat, and is fixed to the groove plane by bolt six, oil hole one and oil hole two are respectively connected to hydraulic cylinder oil hole one and hydraulic cylinder oil hole two, and a hook-shaped pressure head is connected to a piston rod through a small shaft and a connecting plate, and is locked with an open retaining spring ring.

[0010] The structure of the limit device of the present invention is that the limit body is fixed through the threaded hole five on the step surface of the supporting positioning seat, symmetrical with the curved back clamp one and the curved back clamp two, a spring two is arranged in the hole of the limit body, and spherical steel balls are installed at both ends of the spring two and locked by riveting.

[0011] The fork-shaped clamping device described in the present invention includes: a pad block is arranged behind the supporting positioning seat, and is fixed to the threaded hole 2 of the base plate by four groups of bolts 8 through the countersunk hole 1, the fork-shaped lever hydraulic cylinder is fixed to the threaded hole of the pad block by four groups of bolts 7, the fork-shaped pressure head is connected to the hydraulic cylinder piston rod through a pin shaft 1, a pin shaft 2, and a connecting plate, and is locked with an open retaining spring ring, and the rear end ferrule joints 3 and ferrule joints 7 of the left and right oil circuit systems of the basic device are respectively fixed to the hydraulic cylinder threaded hole 1 and the hydraulic cylinder threaded hole 2.

[0012] The reset device described in the present invention includes: a reset body has an inclined left-right symmetrical stepped threaded blind hole, a spring three and a ball-shaped sliding rod are arranged in the hole and locked with a threaded sleeve, the reset body is arranged on both sides of the groove plane above the supporting positioning seat, and is fixed with bolts using countersunk holes two respectively, and the ball-shaped sliding rod supports the lower part of the inclined surface of the curved back clamp one and the curved back clamp two.

[0013] The advantages of the present invention are:

[0014] 1. The clamping surface of the present invention is selected on the left and right planes at the rear of the workpiece, which is a solid and will not cause elastic recovery deformation of the processing surface affected by the clamping force.

[0015] 2. The present invention utilizes curved back pliers to synchronously and symmetrically clamp the two sides of the workpiece, with accurate positioning and high relative position accuracy of each surface, and will not cause elastic deformation after processing.

[0016] 3. The workpiece can be clamped once to complete multiple processes, namely, the opening groove, semi-circular arc surface, mounting holes on both sides, end face and main hole processing, which improves production efficiency, improves product quality and reduces the labor intensity of employees. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the present invention and workpiece clamping;

[0019] Figure 3 It is a schematic diagram of the assembly of the basic device and the trapezoidal clamping device of the present invention;

[0020] Figure 4A It is a schematic diagram of the assembly of the supporting positioning device, the hook-shaped tightening device, the limiting device, and the resetting device of the present invention;

[0021] Figure 4B yes Figure 4A Right view of

[0022] Figure 5A It is a structural schematic diagram of the limiting device of the present invention;

[0023] Figure 5B is a cross-sectional view of the limiting device of the present invention;

[0024] Fig. 6A yes Figure 2 The structural diagram on the left;

[0025] Figure 6B yes Fig. 6A AA section view;

[0026] Figure 6C yes Fig. 6A The left structural diagram of ;

[0027] Fig. 7A yes Fig. 6A Schematic diagram on the right;

[0028] Figure 7B yes Fig. 7A BB cross-sectional view;

[0029] Figure 7C yes Fig. 7A CC section view;

[0030] Numbers in the figure:

[0031] Basic device 1, basic plate 101, countersunk hole 1011, cylindrical hole 1012, threaded hole 1013, threaded hole 2 1014, threaded hole 3 1015, oil circuit island 102, bolt 1021, oil circuit island threaded hole 1022, two-way control valve 103, sealing cover 1031, bolt 2 1032, cylindrical pin 104, quick-connect connector 105, ferrule connector 1 1051, oil pipe 1 1052, tee connector 1 1053, ferrule connector 2 1054, ferrule connector 3 1055, ferrule connector 4 1056, quick-connect connector 2 106, ferrule connector 5 1061, oil pipe 2 1062, tee connector 2 1063, ferrule connector 6 1064, ferrule connector 7 1065, ferrule connector 8 1066, bolt 3 107;

[0032] Trapezoidal clamping device 2, straight hydraulic cylinder 201, piston rod 2011, threaded step shaft 202, trapezoidal slider 203, trapezoidal slider countersunk hole 2031, trapezoidal slider inclined surface 1 2032, trapezoidal slider inclined surface 2 2033, bolt 4 204, bolt 5 205,

[0033] Support positioning device 3, support positioning seat 301, support surface 30101, tooth surface 1 30102, tooth surface 2 30103, upper groove 30104, lower groove 30105, groove 30106, cylindrical pin hole 1 30107, cylindrical pin hole 2 30108, oil line threaded hole 1 30109, oil line threaded hole 2 30110, oil hole 1 30111, oil hole 2 30112, hydraulic cylinder oil hole 1 30113, hydraulic cylinder oil hole 2 30114, threaded hole 4 30115, threaded Hole five 30116, middle hole 30117, square groove semicircular hole 30118, opposite face boss 30119, blind hole 30120, support and positioning seat step surface 30121, curved back clamp one 302, jaw tooth surface one 3021, curved back clamp arc surface one 3022, curved back clamp two 303, jaw tooth surface two 3031, curved back clamp arc surface two 3032, step shaft 304, open spring retaining ring 305, threaded plug 306, spring one 307, round head sliding rod 308, threaded positioning pin 309;

[0034] Hook-shaped tightening device 4, hydraulic cylinder 401, piston rod 4011, hook-shaped pressing head 402, bolt six 403, small shaft 404, connecting plate 405;

[0035] Limiting device 5, limiting body 501, spring 2 502, spherical steel ball 503;

[0036] Fork-shaped clamping device 6, fork-shaped lever hydraulic cylinder 601, hydraulic cylinder piston rod 6011, pin shaft 1 6012, open spring ring 6013, pin shaft 2 6014, connecting plate 6015, hydraulic cylinder threaded hole 1 6016, hydraulic cylinder threaded hole 2 6017, cushion block 602, countersunk hole 1 6021, cushion block threaded hole 6022, fork-shaped pressing head 603, bolt 7 604, bolt 8 605;

[0037] Reset device 7, reset body 701, step thread blind hole 7011, countersunk hole 2 7012, spring 3 702, ball head sliding rod 703, threaded sleeve 704;

[0038] Workpiece 8, mounting surface one 801, mounting surface two 802, mounting surface three 803, small plane 804, crescent-shaped positioning surface 805, arc surface 806 of workpiece bottom, surface one 807, surface two 808, workpiece notch 809, pressing surface one 810, pressing surface two 811. DETAILED DESCRIPTION

[0039] See also Figure 1 , Figure 2, including a basic device 1, a trapezoidal clamping device 2, a supporting and positioning device 3, a hook-shaped jacking device 4, a limiting device 5, a fork-shaped clamping device 6, and a reset device 7, wherein the trapezoidal clamping device 2, the supporting and positioning device 3, and the fork-shaped clamping device 6 are fixed on the basic device 1, and the hook-shaped jacking device 4, the limiting device 5, and the reset device 7 are installed on the supporting and positioning device 3. The supporting and positioning device 3 implements installation and positioning of the workpiece 8, and the limiting device 5 floats symmetrically, and the hook-shaped jacking device 4 supports the workpiece. When the trapezoidal clamping device 2 moves upward, it drives the curved back clamp 1 302 and the curved back clamp 2 303 in the supporting and positioning device 3 to clamp the workpiece 8, and when it moves downward, the reset device 7 supports the two curved back clamps to open.

[0040] See also Figure 3 , Figure 4B , Fig. 7A The basic device 1 includes a basic plate 101, which includes a countersunk hole 1011, a cylindrical hole 1012, a threaded hole 1013, a threaded hole 2 1014, and a threaded hole 3 1015, and an oil circuit island 102. The oil circuit island is fixed to the front end of the basic plate through the threaded hole 3 1015 using three sets of bolts 1021, and a two-way control valve 103 is provided on it, and is fixed through the threaded hole 1022 of the oil circuit island with a sealing cover 1031 and a bolt 2 1032. The oil circuit hole of the two-way control valve is connected to the oil circuit hole of the oil circuit island, and a quick connector 105 , the quick-connect connector 106 is respectively fixed to the threaded holes on both sides of the front of the oil circuit island 102, the ferrule connector 1 1051 is installed at the right end of the oil circuit island, and the connected oil pipe 1 1052 and the tee connector 1 1053, the ferrule connector 2 1054, the ferrule connector 3 1055, and the ferrule connector 4 1056 form the right oil circuit system, and the ferrule connector 5 1061 is installed at the left end of the oil circuit island, and the connected oil pipe 2 1062 and the tee connector 2 1063, the ferrule connector 6 1064, the ferrule connector 7 1065, and the ferrule connector 8 1066 form the left oil circuit system, see Figure 3 The cylindrical pin 104 is installed in the cylindrical hole of the base plate 1012 to limit the displacement of the support and positioning seat 301 on the base plate, see Figure 4B , bolt three 107 is used for connection with the supporting positioning device 3;

[0041] See also Figure 3 , Figure 4A-4B , Figure 6B , Figure 7B The trapezoidal clamping device 2 includes a straight hydraulic cylinder 201, a piston rod 2011, a threaded stepped shaft 202, a trapezoidal slider 203, a trapezoidal slider counterbore 2031, a trapezoidal slider inclined surface 1 2032, a trapezoidal slider inclined surface 2 2033, a bolt 4 204, and a bolt 5 205. The straight hydraulic cylinder 201 is fixedly mounted to the threaded hole 1013 of the base plate 101 by four sets of bolts 5 205 near the oil circuit island 102. Figure 4B, the upper threaded hole of the straight hydraulic cylinder 201 is installed with a ferrule joint 4 1056, and the lower threaded hole is installed with a ferrule joint 8 1066, see Figure 6B One end of the threaded step shaft 202 is fastened in the threaded hole of the hydraulic cylinder piston rod 2011, and the other end is fixed to the trapezoidal slider 203.

[0042] See also Figure 4A , 4B , Fig. 6A , 6B , 7A, 7C, the support and positioning device 3 includes; a support and positioning seat 301, the support and positioning seat 301 includes a support surface 30101 and a tooth surface 1 30102, a tooth surface 2 30103, for mounting the workpiece 8, the support and positioning seat 301 is positioned on the base plate 101 through a cylindrical pin 104, and is fixed with six sets of bolts 107 through a countersunk hole 1011 through a threaded hole 4 30115, and the straight hydraulic cylinder 201 of the trapezoidal clamping device 2 is arranged in a groove 30105 below the support and positioning seat, and the piston rod 2 011 passes through the middle hole 30117 of the lower groove 30105 and the upper groove 30104 and extends into the semicircular hole 30118 of the upper groove, and produces a sliding fit; the trapezoidal slider countersunk hole 2031 of the trapezoidal slider 203 is connected to the other end of the threaded step shaft 202 and is fastened with bolt four 204, the bottom surface contacts the end surface of the piston rod 2011, and the front and rear parallel surfaces are in sliding contact with the upper groove 30104 of the support positioning seat, and can reciprocate freely up and down. The curved back clamp 1 302 and the curved back clamp 2 303 are respectively arranged on both sides of the upper groove 30104 of the support positioning seat The left and right cylindrical pin holes 1 30107 and the second cylindrical pin hole 30108 are connected with the step shaft 304 respectively, and locked with the open spring clamp 305. The curved back clamp arc surface 1 3022 and the curved back clamp arc surface 2 3032 are in sliding contact with the trapezoidal slider inclined surface 1 2032 and the trapezoidal slider inclined surface 2 2033 respectively. When the trapezoidal slider 203 moves upward, it pushes the curved back clamp 1 302 and the curved back clamp 2 303 to rotate along the step shaft 304 respectively. The jaw tooth surface 1 3021 and the jaw tooth surface 2 3031 are used to contact the surface of the workpiece 8 at the same time. The first surface 807 and the second surface 808 symmetrically clamp the workpiece 8; the threaded step holes below the tooth-shaped supporting surface 1 30102 and the second tooth-shaped supporting surface 30103 are respectively provided with a round-headed sliding rod 308, a spring 1 307 and a threaded plug 306, and the opposite surface bosses 30119 are respectively fixed with threaded positioning pins 309. The round-headed sliding rod 308 pushes the small plane 804 at the back of the workpiece to move forward under the action of the spring 1 307, so that the front crescent positioning surface 805 is positioned against the plane of the threaded positioning pin 309 to prevent the workpiece from moving forward and backward during clamping. Figure 4BThe middle ferrule joint 2 1054 and the ferrule joint 6 1064 of the oil circuit system are respectively fixed to the oil circuit threaded hole 1 30109 and the oil circuit threaded hole 2 30110 of the supporting positioning seat, and the medium enters the hydraulic cylinder through the oil hole 1 30111, the hydraulic cylinder oil hole 1 30113 and the oil hole 2 30112, and the hydraulic cylinder oil hole 2 30114 to execute the hook-shaped pressure head to tighten and loosen the workpiece.

[0043] See also Figure 4A , 4B , Figure 7B The hook-shaped tightening device 4 includes: a hook-shaped lever hydraulic cylinder 401 is installed in the blind hole 30120 of the groove 30106 of the supporting positioning seat 301, and is fixed on the groove plane by bolt six 403, and the oil hole 1 30111 and the oil hole 2 30112 are respectively connected with the hydraulic cylinder oil hole 1 30113 and the hydraulic cylinder oil hole 2 30114, and the hook-shaped pressure head 402 is connected to the piston rod 4011 through the small shaft 404 and the connecting plate 405, and is locked with an open retaining ring. The hook-shaped pressure head 402 uses the hydraulic cylinder to apply a tightening force to the threaded locating pin 309 on the arc surface 806 at the bottom of the workpiece to prevent the workpiece from moving backward when processing the main hole.

[0044] See also Figure 4A , Figure 5A , 5B , Figure 6B , Figure 7B The structure of the limiting device 5 is that the limiting body 501 is fixed through the threaded hole 5 30116 on the step surface of the supporting positioning seat 30121, and is symmetrical with the curved back clamp 1 302 and the curved back clamp 2 303. A spring 2 502 is provided in the hole of the limiting body 501. Spherical steel balls 503 are installed at both ends of the spring 2 502 and locked by riveting. The limiting device 5 penetrates into the workpiece slot 809. The spherical steel balls 503 float on the workpiece under the action of the spring to maintain left-right symmetry.

[0045] See also Fig. 6A , Figure 6C , Figure 7B The fork-shaped clamping device 6 includes: a pad 602 is arranged behind the supporting positioning seat 301, and is fixed to the threaded hole 1014 of the base plate 101 by four groups of bolts 605 through the countersunk hole 1 6021, and the fork-shaped lever hydraulic cylinder 601 is fixed to the pad threaded hole 6022 by four groups of bolts 7 604, and the fork-shaped pressure head 603 is connected to the hydraulic cylinder piston rod 6011 through the pin 1 6012, the pin 2 6014, and the connecting plate 6015, and is locked with an open spring ring 6013, and the rear end ferrule joints 3 1055 and ferrule joints 7 1065 of the left and right oil circuit systems of the basic device 1 are respectively fixed to the hydraulic cylinder threaded hole 1 6016 and the hydraulic cylinder threaded hole 2 6017, and the fork-shaped pressure head 603 avoids obstacles and clamps the clamping surface 1 810 and the clamping surface 2 811 on the left and right sides of the rear of the workpiece.

[0046] See also Figure 4A , Figure 6B The reset device 7 includes: a reset body 701 having an inclined bilaterally symmetrical step threaded blind hole 7011, a spring 3 702 and a ball-shaped sliding rod 703 are arranged in the hole, and are locked with a threaded sleeve 704. The reset body 701 is arranged on both sides of the plane of the groove 30104 above the supporting positioning seat, and is fixed with bolts using countersunk holes 7012. The ball-shaped sliding rod 703 supports the lower part of the inclined surface of the curved back clamp 302 and the curved back clamp 303. When the trapezoidal slider 203 moves downward, the spring 702 is used to support the curved back clamp 302 and the curved back clamp 303 to open.

[0047] How it works

[0048] The two small planes 804 at the back of the workpiece 8 are brought into contact with the round-headed sliding rod 308 to push the compression spring 1 307 backwards, and the workpiece notch 809 is aligned with the spherical steel ball 503 of the limiting device 5 and pressed down, while ensuring that the mounting surface 1 801, the mounting surface 2 802, and the mounting surface 3 803 are in contact with the supporting surface 30101, the tooth-shaped surface 1 30102, and the tooth-shaped surface 2 30103 of the supporting positioning seat 301. Under the action of the spring 1 307, the round-headed sliding rod 308 pushes the workpiece 8 forward, so that the front crescent-shaped positioning surface 805 is positioned against the plane of the threaded positioning pin 309, and the spherical steel ball 503 of the limiting device 5 is elastically pressed. The force of spring 2 502 floats the workpiece downward to maintain left-right symmetry; with a manual switch or program instruction control, the hook-shaped pressure head 402 presses the bottom arc surface 806 of the workpiece, and the fork-shaped pressure head 603 presses the clamping surface 1 810 and the clamping surface 2 811, and the trapezoidal slider 203 pushes the curved back clamp 1 302 and the curved back clamp 2 303 upward to rotate along the step shaft 304, and the jaw tooth surface 1 3021 and the jaw tooth surface 2 3031 simultaneously contact the workpiece surface 1 807 and the surface 2 808, symmetrically clamping the workpiece; when the workpiece 8 is processed, the machine tool stops, and the clamp is released by manual touch switch or program instruction control to take out the workpiece.

Claims

1. A hydraulic clamp, characterized in that: It includes a basic device, a trapezoidal clamping device, a supporting and positioning device, a hook-shaped jacking device, a limiting device, a fork-shaped pressing device, and a resetting device, wherein the trapezoidal clamping device, the supporting and positioning device, and the fork-shaped pressing device are respectively fixed on the basic device, and the hook-shaped jacking device, the limiting device, and the resetting device are respectively installed on the supporting and positioning device; The trapezoidal clamping device comprises a straight hydraulic cylinder, a piston rod, a threaded step shaft, a trapezoidal slider, a trapezoidal slider counterbore, a trapezoidal slider inclined surface 1, a trapezoidal slider inclined surface 2, a bolt 4, and a bolt 5, wherein the straight hydraulic cylinder is fixedly mounted with a threaded hole 1 of a base plate through four groups of bolts 5 near the oil circuit island, a ferrule joint 4 is mounted on the upper threaded hole of the straight hydraulic cylinder, and a ferrule joint 8 is mounted on the lower threaded hole, one end of the threaded step shaft is fastened in the threaded hole of the hydraulic cylinder piston rod, and the other end is fixedly mounted with the trapezoidal slider; The supporting and positioning device includes a supporting and positioning seat, and the supporting and positioning seat includes a supporting surface and a tooth-shaped surface 1 and a tooth-shaped surface 2 for mounting a workpiece. The supporting and positioning seat is positioned on the base plate by a cylindrical pin, and is fixed with six groups of bolts through a countersunk hole through a threaded hole 4. The straight hydraulic cylinder of the trapezoidal clamping device is arranged in the groove below the supporting and positioning seat, and the piston rod extends through the middle hole of the lower groove and the upper groove to the semicircular hole of the upper groove, and a sliding fit is generated; the trapezoidal slider countersunk hole of the trapezoidal slider is connected to the other end of the threaded step shaft and is fastened with bolt 4, the bottom surface is in contact with the end surface of the piston rod, and the front and rear parallel surfaces are in sliding contact with the upper groove of the supporting and positioning seat. The curved back clamp 1 and the curved back clamp 2 are respectively arranged on both sides of the upper groove of the supporting and positioning seat, and are respectively fixed with a step shaft through the left and right cylindrical pin holes 1 and the cylindrical pin holes 2. The two ends of the cam are connected and locked with an open spring collar. The arc surface 1 and the arc surface 2 of the curved back clamp are in sliding contact with the inclined surface 1 and the inclined surface 2 of the trapezoidal slider respectively. When the trapezoidal slider moves upward, the curved back clamp 1 and the curved back clamp 2 are pushed to rotate along the step axis respectively. The jaw tooth surface 1 and the jaw tooth surface 2 are used to simultaneously contact the surface 1 and the surface symmetrically clamp the workpiece; the threaded step holes below the tooth-shaped supporting surface 1 and the tooth-shaped supporting surface 2 are respectively provided with a round head sliding rod, a spring 1 and a threaded plug, and the opposite surface bosses are respectively fixed with threaded locating pins, and the middle ferrule joint 2 and the ferrule joint 6 of the oil circuit system are respectively fixed with the oil circuit threaded hole 1 and the oil circuit threaded hole 2 of the supporting locating seat, and the medium enters the hydraulic cylinder through the oil hole 1, the hydraulic cylinder oil hole 1 and the oil hole 2, and the hydraulic cylinder oil hole 2, and the hook-shaped pressure head is executed to tighten and loosen the workpiece; The hook-shaped tightening device includes: a hook-shaped lever hydraulic cylinder is installed in a blind hole of a groove of a supporting positioning seat, and is fixed to the groove plane by bolt six, oil hole one and oil hole two are respectively connected to hydraulic cylinder oil hole one and hydraulic cylinder oil hole two, and a hook-shaped pressure head is connected to a piston rod through a small shaft and a connecting plate, and is locked with an open retaining ring.

2. A hydraulic clamp according to claim 1, characterized in that: The basic device includes a basic plate, which includes a countersunk hole, a cylindrical hole, a threaded hole one, a threaded hole two, a threaded hole three, and an oil circuit island. The oil circuit island is fixed to the front end of the basic plate through the threaded hole three by using three sets of bolts one, and a two-way control valve is provided on it. The oil circuit hole of the two-way control valve is connected to the oil circuit hole of the oil circuit island, and a quick-plug connector one and a quick-plug connector two are respectively fixed to the threaded holes on both sides of the front of the oil circuit island. A ferrule connector one is installed at the right end of the oil circuit island, and an oil pipe one connected with a three-way connector one, a ferrule connector two, a ferrule connector three, and a ferrule connector four form a right-side oil circuit system. A ferrule connector five is installed at the left end of the oil circuit island, and an oil pipe two connected with a three-way connector two, a ferrule connector six, a ferrule connector seven, and a ferrule connector eight form a left-side oil circuit system. A cylindrical pin is installed in the cylindrical hole of the basic plate to limit the displacement of the supporting positioning seat on the basic plate, and a bolt three is used for connection with the supporting positioning device.

3. A hydraulic clamp according to claim 1, characterized in that: The structure of the limit device is that the limit body is fixed through the threaded hole 5 on the step surface of the supporting positioning seat, symmetrical with the curved back clamp 1 and the curved back clamp 2, and a spring 2 is arranged in the hole of the limit body, and spherical steel balls are installed at both ends of the spring 2 and locked by riveting.

4. A hydraulic clamp according to claim 1, characterized in that: The fork-shaped clamping device includes: a pad block is arranged behind the supporting positioning seat, and is fixed to the threaded hole 2 of the base plate by four groups of bolts 8 through the countersunk hole 1, the fork-shaped lever hydraulic cylinder is fixed to the threaded hole of the pad block by four groups of bolts 7, the fork-shaped pressure head is connected to the hydraulic cylinder piston rod through the pin shaft 1, the pin shaft 2, and the connecting plate, and is locked with an open retaining spring ring, and the rear end ferrule joints 3 and ferrule joints 7 of the left and right oil circuit systems of the basic device are respectively fixed to the hydraulic cylinder threaded hole 1 and the hydraulic cylinder threaded hole 2.

5. A hydraulic clamp according to claim 1, characterized in that: The reset device includes: a reset body having an inclined left-right symmetrical stepped threaded blind hole, a spring three and a ball-shaped sliding rod are arranged in the hole and locked with a threaded sleeve, the reset body is arranged on both sides of the groove plane above the supporting positioning seat, and is fixed with bolts using countersunk holes two respectively, and the ball-shaped sliding rod supports the lower part of the inclined surface of the curved back clamp one and the curved back clamp two.

Images