Hydraulic clamping device for machine tools

Abstract

This invention relates to the field of clamping technology and discloses a hydraulic clamping device for machine tools, comprising a base and two connecting cylinders. A rotating shaft is rotatably connected to the inner surface of the base. A handwheel is fixedly connected to the rotating shaft on the front outer surface of the base. A transmission gear is fixedly sleeved on the outer surface of the rotating shaft. A rack is movably meshed on both the top and bottom outer surfaces of the transmission gear. Two adjusting plates are movably inserted inside a hollow plate. Fixing screw holes are provided on the outer surfaces of both the adjusting plates and the hollow plate. L-shaped fixing feet are fixedly connected to the bottom outer surface of the adjusting plates. The rotating shaft is rotated by the handwheel, causing the transmission gear to rotate, which in turn moves the rack to adjust the positions of the L-shaped fixing feet on the left and right sides. The positions of the L-shaped fixing feet on the front and rear sides are adjusted by adjusting the positions of the adjusting plates within the hollow plate. This allows the device to be used with various machine tool models, increasing its versatility.

Description

Technical Field

[0001] This invention relates to the field of clamping technology, specifically to a hydraulic clamping device for machine tools. Background Technology

[0002] Machine tool processing refers to the process of using a machine tool to ensure the relative movement relationship between the cutting tool and the fixture, and using the cutting tool (or other tools) to process the workpiece mounted on the fixture. However, this process is not necessarily cutting; it may also be pressure processing, such as knurling or spinning on a lathe. In the machine tool processing production process, fixtures are needed to hold the workpiece to prevent processing errors caused by the workpiece shifting during processing.

[0003] In the prior art, when hydraulic clamps are installed on machine tools, the fixed size of the bottom fixing plate prevents the hydraulic clamps from being well adapted to and connected to different models of machine tools. Different models of machine tools require different clamps, which limits their use. In addition, most existing clamps clamp the outer circle of the workpiece. However, when machining thin-walled kits or pipes, the thin outer wall of the workpiece will cause it to deform inward due to the force during machining, resulting in incomplete machining and affecting the machining accuracy. Therefore, a machine tool hydraulic clamping device is proposed. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention provides a hydraulic clamping device for machine tools to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a machine tool hydraulic clamping device, comprising a base and two connecting cylinders, wherein a rotating shaft is rotatably connected to the inner surface of the base, the rotating shaft rotatably penetrates the front outer surface of the base, a hand crank is fixedly connected to the rotating shaft on the front outer surface of the base, a transmission gear is fixedly sleeved on the outer surface of the rotating shaft, racks are movably meshed on the top and bottom outer surfaces of the transmission gear, two racks respectively movably penetrate the left and right outer surfaces of the base, vertical rods are fixedly connected to the opposite outer surfaces of the two racks, hollow plates are fixedly connected to the outer surfaces of the two vertical rods, two adjusting plates are movably inserted into the interior of each hollow plate, fixing screw holes are opened on the outer surfaces of the adjusting plates and the hollow plates, the number of fixing screw holes on the outer surface of the adjusting plates is several, an L-shaped fixing foot is fixedly connected to the bottom outer surface of the adjusting plate, and mounting screw holes are opened on the outer surface of the L-shaped fixing foot;

[0006] The outer surface of the rotating shaft is fixedly fitted with a first ratchet and a second ratchet. The inner front surface of the base is fixedly connected with a first connecting shaft and a second connecting shaft. The outer surface of the first connecting shaft is rotatably connected with a first pawl. The first pawl engages with the ratchet teeth of the first ratchet, and the second pawl engages with the ratchet teeth of the second ratchet.

[0007] The outer surfaces of the first and second pawls are both fixedly connected with pull ropes. The front outer surface of the base is fixedly connected with two support plates. The top outer surfaces of the two support plates are fixedly connected with two return springs. The outer surfaces of the two return springs are fixedly connected with movable plates. The other ends of the two pull ropes are respectively fixedly connected to the top outer surfaces of the two movable plates.

[0008] As a further explanation of the present invention, two symmetrically arranged vertical plates are fixedly connected to the top outer surface of the base. Hydraulic cylinders are fixedly mounted on the opposing outer surfaces of the two vertical plates, and the opposing outer surfaces of the two vertical plates are respectively fixedly connected to the drive ends of the two hydraulic cylinders. Mounting brackets are fixedly connected to the output ends of the two hydraulic cylinders. A support cylinder is fixedly connected to the other end of the mounting bracket. A drive shaft is rotatably connected to the inner surface of the support cylinder. A drive motor is fixedly mounted on the outer surface of the support cylinder near the mounting bracket. The output end of the drive motor is fixedly connected to the drive shaft. A drive bevel gear is fixedly sleeved on the outer surface of the drive shaft. The inner surface of the support cylinder... Four lead screws are arranged in a circular array and rotate. Each of the four lead screws has a driven bevel gear fixedly sleeved on its outer surface. Each of the four driven bevel gears is movably meshed with the outer surface of the driving bevel gear. Each of the four lead screws has a threaded block threaded to its outer surface. Each of the four threaded blocks has a slider fixedly connected to its outer surface. Each of the four sliders has a connecting block fixedly connected to its outer surface on the side away from the center of the support cylinder. Each of the four connecting blocks has two support springs and a pressure sensor fixedly connected to its outer surface. The other end of each support spring is fixedly connected to an arc-shaped top plate. A controller is installed on the outer surface of the base. The controller is electrically connected to the pressure sensor (not shown in the figure).

[0009] As a further explanation of the present invention, C-shaped seats are fixedly connected to the opposite outer surfaces of the two connecting cylinders, and threaded rods are threaded through the top outer surfaces of the two C-shaped seats, and pressure plates are rotatably connected to the bottom outer surfaces of the threaded rods.

[0010] As a further explanation of the present invention, four support frames are fixedly connected to the bottom inner surface of the base, and support bars are fixedly connected to the front and rear outer surfaces of the rack. Ball bearings are provided on the top outer surfaces of the four support frames, and the four support bars are respectively in contact with the top outer surfaces of the four ball bearings.

[0011] As a further explanation of the present invention, through holes are provided on the outer surfaces of both the left and right sides of the base, and the area of ​​the through holes is larger than the cross-sectional area of ​​the rack and the support bar as a whole.

[0012] As a further explanation of the present invention, two first fixed pulleys are installed on the inner front surface of the base, and two second fixed pulleys are installed on the outer front surface of the base. The pull rope on the left side is respectively laid on the outer surface of the first and second fixed pulleys on the left side, and the pull rope on the right side is respectively laid on the outer surface of the first and second fixed pulleys on the right side.

[0013] As a further explanation of the present invention, two slide rods are fixedly connected to the top outer surfaces of the two support plates, the two movable plates are respectively sleeved on the outer surfaces of the four slide rods, and the four return springs are respectively sleeved on the outer surfaces of the four slide rods.

[0014] As a further explanation of the present invention, flanges are fixedly connected to the outer surfaces of both the support cylinder and the connecting cylinder.

[0015] As a further explanation of the present invention, the outer surface of the support cylinder is provided with four sliding grooves, and the four sliders are respectively slidably connected to the interior of the four sliding grooves.

[0016] As a further explanation of the present invention, two limiting rods are movably inserted into the top outer surface of the C-shaped seat, and the bottom outer surfaces of the two limiting rods are fixedly connected to the top outer surface of the pressure plate.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. In the machine tool hydraulic clamping device provided by the present invention, the rotating shaft is driven by a hand crank, which causes the transmission gear to rotate and drives the rack to move and adjust the position of the L-shaped fixing feet on the left and right sides. The position of the front and rear L-shaped fixing feet is adjusted by adjusting the position of the adjusting plate in the hollow plate, so that the device can be used for multiple models of machine tools, thus increasing the applicability of the device.

[0019] 2. In the hydraulic clamping device for machine tools provided by the present invention, the pipe workpiece is sleeved on the outside of the arc-shaped top plate. The drive shaft is driven by the drive motor to rotate, and the active bevel gear and the driven bevel gear are used to make the lead screw rotate. The screw block drives the arc-shaped top plate to tighten the inner wall of the pipe workpiece. With the help of the support spring and pressure sensor, the clamping force can be controlled to avoid damage to the pipe workpiece caused by excessive clamping force.

[0020] 3. In the machine tool hydraulic clamping device provided by the present invention, the flange is used to install the connecting cylinder, and together with the threaded rod and the pressure plate, it clamps and fixes rectangular or other non-pipe workpieces.

[0021] 4. The machine tool hydraulic clamping device provided by the present invention is applicable to clamping tubular workpieces and also applicable to clamping non-tubular workpieces such as rectangular ones, and has high applicability. Attached Figure Description

[0022] Figure 1 This is a front view structural diagram of the present invention;

[0023] Figure 2 This is a schematic diagram of the frontal cross-sectional structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the left sectional view of the present invention;

[0025] Figure 4 For the present invention Figure 1 Enlarged structural diagram at point A in the middle;

[0026] Figure 5 For the present invention Figure 3 Enlarged structural diagram at point B;

[0027] Figure 6 This is a schematic diagram of the hydraulic cylinder and related structures of the present invention;

[0028] Figure 7 This is a schematic diagram of the internal structure of the support cylinder of the present invention;

[0029] Figure 8 This is a front view schematic diagram of the support cylinder structure of the present invention;

[0030] Figure 9 For the present invention Figure 8 Enlarged structural diagram at point C;

[0031] Figure 10 This is a schematic diagram of the structure of the present invention when used to clamp rectangular or other non-cylindrical workpieces;

[0032] Figure 11 This is a schematic diagram of the C-shaped seat and related structures of the present invention.

[0033] In the diagram: 1. Base; 2. Rotating shaft; 3. Transmission gear; 4. Rack; 5. Vertical rod; 6. Hollow plate; 7. Adjusting plate; 8. L-shaped fixing foot; 9. First ratchet; 10. Second ratchet; 11. First connecting shaft; 12. First pawl; 13. Second connecting shaft; 14. Second pawl; 15. Pull rope; 16. Support plate; 17. Return spring; 18. Movable plate; 19. Hand crank; 20. Vertical plate; 21. Hydraulic cylinder; 22. Mounting bracket; 23. Support cylinder; 24. Drive shaft; 25. Driving bevel gear; 26. Lead screw; 27. Driven bevel gear; 28. Threaded block; 29. ​​Connecting block; 30. Support spring; 31. Arc-shaped top plate; 32. Pressure sensor; 33. Connecting cylinder; 34. C-shaped seat; 35. Threaded rod; 36. Pressure plate; 37. Flange; 38. Drive motor. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0035] Please refer to the following: Figures 1-5This invention provides a technical solution: a machine tool hydraulic clamping device, comprising a base 1 and two connecting cylinders 33. A rotating shaft 2 is rotatably connected to the inner surface of the base 1, and the rotating shaft 2 rotatably passes through the front outer surface of the base 1. A hand crank 19 is fixedly connected to the rotating shaft 2 on the front outer surface of the base 1. A transmission gear 3 is fixedly sleeved on the outer surface of the rotating shaft 2. A rack 4 is movably meshed on both the top and bottom outer surfaces of the transmission gear 3. The two racks 4 respectively movably pass through the left and right outer surfaces of the base 1. Vertical rods 5 are fixedly connected to the opposite outer surfaces of the two racks 4. Hollow plates 6 are fixedly connected to the outer surfaces of the two vertical rods 5. Two adjusting plates 7 are movably inserted into the interior of each hollow plate 6. Fixing screw holes are opened on the outer surfaces of both the adjusting plates 7 and the hollow plates 6. The number of fixing screw holes on the outer surface of the adjusting plates 7 is several. The bottom outer surface of the adjusting plates 7 is fixedly connected to... The base 1 is equipped with an L-shaped fixed foot 8, the outer surface of which has a mounting screw hole. The outer surface of the rotating shaft 2 is fixedly fitted with a first ratchet 9 and a second ratchet 10. The inner front surface of the base 1 is fixedly connected to a first connecting shaft 11 and a second connecting shaft 13. The outer surface of the first connecting shaft 11 is rotatably connected to a first pawl 12, which engages with the ratchet teeth of the first ratchet 9. The second pawl 14 engages with the ratchet teeth of the second ratchet 10. Pull ropes 15 are fixedly connected to the outer surfaces of both the first pawl 12 and the second pawl 14. Two support plates 16 are fixedly connected to the outer front surface of the base 1. Two return springs 17 are fixedly connected to the top outer surfaces of both support plates 16. Movable plates 18 are fixedly connected to the outer surfaces of both return springs 17. The other ends of the two pull ropes 15 are fixedly connected to the top outer surfaces of the two movable plates 18, respectively.

[0036] Four support frames are fixedly connected to the bottom inner surface of the base 1. Support bars are fixedly connected to the front and rear outer surfaces of the rack 4. Ball bearings are provided on the top outer surfaces of the four support frames. The four support bars are respectively in contact with the top outer surfaces of the four ball bearings. The ball bearings on the support frames support the support bars, which in turn support the rack 4, allowing the rack 4 to move relatively stably.

[0037] Through holes are provided on the outer surfaces of both sides of the base 1. The area of ​​the through holes is larger than the cross-sectional area of ​​the rack 4 and the support bar as a whole. The through holes provide a channel for the movement of the rack 4 and the support bar.

[0038] Two first fixed pulleys are installed on the inner front surface of the base 1, and two second fixed pulleys are installed on the outer front surface of the base 1. The left pull rope 15 is laid on the outer surface of the first and second fixed pulleys on the left, and the right pull rope 15 is laid on the outer surface of the first and second fixed pulleys on the right.

[0039] Two slide rods are fixedly connected to the top outer surfaces of the two support plates 16. Two movable plates 18 are respectively sleeved on the outer surfaces of the four slide rods, and four return springs 17 are respectively sleeved on the outer surfaces of the four slide rods. When the movable plates 18 move, they slide on the outer surfaces of the slide rods. By setting the slide rods, the movable rods can move stably, and the return springs 17 are limited to prevent them from tilting or deforming.

[0040] The outer surface of the support cylinder 23 has four grooves, and the four sliders are slidably connected to the inside of the four grooves respectively. When the lead screw 26 rotates, it drives the threaded block 28 to make the slider slide inside the groove, and the groove provides a channel for the movement of the slider.

[0041] In the specific implementation process, the base 1 is fixed in a suitable position on the machine tool. Depending on the machine tool model, the position of the L-shaped fixing feet 8 is adjusted. When it is necessary to expand the position of the L-shaped fixing feet 8 on both sides, the right movable plate 18 is pressed down. The right movable plate 18 moves downward, causing the return spring 17 to compress and pull the pull rope 15. The pull rope 15 drives the first pawl 12, causing it to disengage from the ratchet teeth of the first ratchet wheel 9, allowing the rotating shaft 2 to rotate clockwise. At this time, the hand crank 19 is rotated clockwise, causing the rotating shaft 2 to rotate, which in turn causes the transmission gear 3 to rotate, thereby causing the two racks 4 to move away from each other, thus adjusting the distance between the left and right L-shaped fixing feet 8. After adjustment, the force applied to the movable rod is stopped, allowing the return spring 18 to return to its original position. The spring 17 drives the movable rod to reset. Under the gravity of the first pawl 12, the first pawl 12 engages with the ratchet teeth of the first ratchet 9, limiting the first ratchet 9. Under the action of the second ratchet 10 and the second pawl 14, the rotating shaft 2 cannot rotate, thus completing the adjustment of the distance between the L-shaped fixing feet 8 on both sides. Then, as needed, the fixing bolts are unscrewed, the position of the adjusting plate 7 in the hollow plate 6 is adjusted, and the fixing screw holes on the adjusting plate 7 are aligned with the hollow screw holes on the hollow plate 6. The fixing bolts are then screwed in to fix the adjusting plate 7 and the hollow plate 6. Finally, the mounting bolts are screwed into the mounting screw holes to fix the L-shaped fixing feet 8, thus fixing the base 1. This allows the device to be fixed on different types of machine tools, thereby increasing the applicability of the clamping device. Example 2

[0042] Please refer to the following: Figure 1-3 and Figures 6-9The present invention provides a technical solution: Two symmetrically arranged vertical plates 20 are fixedly connected to the top outer surface of the base 1. Hydraulic cylinders 21 are fixedly installed on the opposite outer surfaces of the two vertical plates 20. The opposite outer surfaces of the two vertical plates 20 are respectively fixedly connected to the driving ends of the two hydraulic cylinders 21. Mounting brackets 22 are fixedly connected to the output ends of the two hydraulic cylinders 21. A support cylinder 23 is fixedly connected to the other end of the mounting bracket 22. A drive shaft 24 is rotatably connected to the inner surface of the support cylinder 23. A drive motor 38 is fixedly installed on the outer surface of the support cylinder 23 near the mounting bracket 22. The output end of the drive motor 38 is fixedly connected to the drive shaft 24. An active bevel gear 25 is fixedly sleeved on the outer surface of the drive shaft 24. The inner surface of the support cylinder 23... Four lead screws 26 are arranged in a circumferential array on the surface. Each of the four lead screws 26 has a driven bevel gear 27 fixedly sleeved on its outer surface. Each of the four driven bevel gears 27 is movably meshed with the outer surface of the driving bevel gear 25. Each of the four lead screws 26 has a threaded block 28 threadedly connected to its outer surface. Each of the four threaded blocks 28 has a slider fixedly connected to its outer surface. Each of the four sliders has a connecting block 29 fixedly connected to its outer surface. Each of the four connecting blocks 29 has two support springs 30 and a pressure sensor 32 fixedly connected to its outer surface on the side away from the center of the support cylinder 23. The other end of the support spring 30 is fixedly connected to an arc-shaped top plate 31. A controller is installed on the outer surface of the base 1. The controller is electrically connected to the pressure sensor 32 (not shown in the figure).

[0043] In the specific implementation process, when clamping the cylindrical tube workpiece, one end of the cylindrical tube is fitted onto the arc-shaped top plate 31 on one side. Then, the hydraulic cylinders 21 on both sides are activated. The hydraulic cylinders 21 drive the support cylinders 23 to move, so that the two support cylinders 23 clamp the tube workpiece. Then, the drive motor 38 is activated, which drives the drive shaft 24 to rotate, and drives the active bevel gear 25 to rotate. The active bevel gear 25 drives multiple driven bevel gears 27, causing multiple lead screws 26 to rotate. The lead screws 26 drive the threaded block 28 to move, so that the threaded block 28 drives the slider, which in turn drives the connecting block 29 to move the arc-shaped top plate 31. Multiple arc-shaped top plates 31 push outward to support the inner wall of the pipe fitting, making the workpiece less prone to inward deformation during processing and thus improving the processing accuracy of the workpiece. When the arc-shaped top plates 31 are in contact with the inner wall of the workpiece, the support spring 30 deforms and the arc-shaped top plates 31 come into contact with the pressure sensor 32, causing the pressure sensor 32 to sense the value. When the value of the pressure sensor 32 reaches the set value, it sends a signal to the controller. The controller receives the signal and causes the drive motor 38 to stop working, so that the clamping force can be controlled, thereby providing stable support and clamping for the pipe fitting workpiece without causing damage to it. Example 3

[0044] Please refer to the following: Figures 10-11The present invention provides a technical solution: C-shaped seats 34 are fixedly connected to the opposite outer surfaces of the two connecting cylinders 33, and threaded rods 35 are threaded through the top outer surfaces of the two C-shaped seats 34, and pressure plates 36 are rotatably connected to the bottom outer surfaces of the threaded rods 35.

[0045] Flanges 37 are fixedly connected to the outer surfaces of both the support cylinder 23 and the connecting cylinder 33. The support cylinder 23 and the connecting cylinder 33 are connected by two corresponding flanges 37.

[0046] Two limiting rods are movably inserted into the top outer surface of the C-shaped seat 34, and the bottom outer surfaces of the two limiting rods are fixedly connected to the top outer surface of the pressure plate 36. When the threaded rod 35 is rotated to move the pressure plate 36, the limiting rods slide on the top outer surface of the C-shaped seat 34, preventing the pressure plate 36 from rotating with the rotation of the threaded rod 35.

[0047] In the specific implementation process, when clamping rectangular or other non-pipe workpieces, the connecting cylinder 33 is installed on the support cylinder 23 with the flange 37 corresponding to it. The rectangular or other non-pipe workpiece is placed on the bottom and upper outer surface of the C-shaped seat 34. The hydraulic cylinder 21 is turned on, and the two hydraulic cylinders 21 drive the two C-shaped seats 34 respectively, so that the two C-shaped seats 34 clamp the two sides of the rectangular or other non-pipe workpiece. The threaded rod 35 is rotated, and the threaded rod 35 drives the pressure plate 36 to move downward, so that the pressure plate 36 contacts the top of the rectangular workpiece, pressing the rectangular or other non-pipe workpiece, thereby clamping the non-pipe workpiece.

[0048] Working Principle: In use, the base 1 is fixed to a suitable position on the machine tool. Depending on the machine tool model, the position of the L-shaped fixing feet 8 is adjusted. When it is necessary to widen the position of the L-shaped fixing feet 8 on both sides, the right movable plate 18 is pressed down. The right movable plate 18 moves downward, causing the return spring 17 to compress and pull the pull rope 15. The pull rope 15 drives the first pawl 12, causing it to disengage from the ratchet teeth of the first ratchet wheel 9, allowing the rotating shaft 2 to rotate clockwise. At this time, rotating the hand crank 19 clockwise causes the rotating shaft 2 to rotate, causing the transmission gear 3 to rotate. This, in turn, causes the two racks 4 to move away from each other, thereby adjusting the distance between the left and right L-shaped fixing feet 8. After adjustment, the force applied to the movable rod is stopped, allowing... The return spring 17 drives the movable rod to return to its original position. Under the gravity of the first pawl 12, the first pawl 12 engages with the ratchet teeth of the first ratchet 9, limiting the first ratchet 9. Under the action of the second ratchet 10 and the second pawl 14, the rotating shaft 2 cannot rotate, thus completing the adjustment of the distance between the L-shaped fixed feet 8 on both sides. Then, as needed, the fixing bolts are unscrewed, the position of the adjusting plate 7 in the hollow plate 6 is adjusted, and the fixing screw holes on the adjusting plate 7 are aligned with the hollow screw holes on the hollow plate 6. The fixing bolts are then screwed in to fix the adjusting plate 7 and the hollow plate 6. Finally, the mounting bolts are screwed into the mounting screw holes to fix the L-shaped fixed feet 8, thus fixing the base 1. This allows the device to be fixed on different types of machine tools, thereby increasing the applicability of the clamping device.

[0049] When clamping a cylindrical tube workpiece, one end of the cylindrical tube is fitted onto the arc-shaped top plate 31 on one side. Then, the hydraulic cylinders 21 on both sides are activated. The hydraulic cylinders 21 drive the support cylinders 23 to move, so that the two support cylinders 23 clamp the tube workpiece. Then, the drive motor 38 is activated, which drives the drive shaft 24 to rotate, and drives the driving bevel gear 25 to rotate. The driving bevel gear 25 drives multiple driven bevel gears 27, which causes multiple lead screws 26 to rotate. The lead screws 26 drive the threaded block 28 to move, which in turn drives the slider, which in turn drives the connecting block 29 to move the arc-shaped top plate 31, so that the multiple arc-shaped top plates 26 can be clamped. The top plate 31 pushes outward to support the inner wall of the pipe, making it less prone to concave deformation during processing and thus improving the processing accuracy of the workpiece. When the arc-shaped top plate 31 is in contact with the inner wall of the workpiece, the support spring 30 deforms and the arc-shaped top plate 31 comes into contact with the pressure sensor 32, causing the pressure sensor 32 to sense the value. When the value of the pressure sensor 32 reaches the set value, it sends a signal to the controller. The controller receives the signal and causes the drive motor 38 to stop working, so that the clamping force can be controlled, thereby providing stable support and clamping for the pipe workpiece without causing damage.

[0050] When clamping rectangular or other non-pipe workpieces, the connecting cylinder 33 is installed on the support cylinder 23 with the flange 37 corresponding to it. The rectangular or other non-pipe workpiece is placed on the bottom and upper outer surface of the C-shaped seat 34. The hydraulic cylinder 21 is activated, and the two hydraulic cylinders 21 drive the two C-shaped seats 34 respectively, so that the two C-shaped seats 34 clamp the two sides of the rectangular or other non-pipe workpiece. The threaded rod 35 is rotated, and the threaded rod 35 drives the pressure plate 36 to move downward, so that the pressure plate 36 contacts the top of the rectangular workpiece, pressing the rectangular or other non-pipe workpiece, thereby clamping the non-pipe workpiece.

[0051] The controller is an existing structure, and the control circuit can be implemented by a person skilled in the art through simple programming. It is common knowledge in the field. It is only used and not modified. Therefore, the control method and circuit connection will not be described in detail.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hydraulic clamping device for a machine tool, comprising a base (1) and two connecting cylinders (33), characterized in that: A rotating shaft (2) is rotatably connected to the inner surface of the base (1). The rotating shaft (2) rotatably passes through the front outer surface of the base (1). A hand crank (19) is fixedly connected to the rotating shaft (2) on the front outer surface of the base (1). A transmission gear (3) is fixedly sleeved on the outer surface of the rotating shaft (2). A rack (4) is movably meshed on both the top and bottom outer surfaces of the transmission gear (3). The two racks (4) movably pass through the left and right outer surfaces of the base (1) respectively. Vertical rods (5) are fixedly connected to the outer surfaces of the two opposite sides. Hollow plates (6) are fixedly connected to the outer surfaces of the two vertical rods (5). Two adjusting plates (7) are movably inserted inside the hollow plates (6). Fixed screw holes are opened on the outer surfaces of the adjusting plates (7) and the hollow plates (6). The number of fixed screw holes on the outer surface of the adjusting plates (7) is several. An L-shaped fixing foot (8) is fixedly connected to the bottom outer surface of the adjusting plate (7). The outer surface of the L-shaped fixing foot (8) is opened with mounting screw holes. The outer surface of the rotating shaft (2) is fixedly fitted with a first ratchet (9) and a second ratchet (10). The inner front surface of the base (1) is fixedly connected with a first connecting shaft (11) and a second connecting shaft (13). The outer surface of the first connecting shaft (11) is rotatably connected with a first pawl (12). The first pawl (12) is movably engaged with the ratchet teeth of the first ratchet (9), and the second pawl (14) is movably engaged with the ratchet teeth of the second ratchet (10). Pull ropes (15) are fixedly connected to the outer surfaces of the first pawl (12) and the second pawl (14). Two support plates (16) are fixedly connected to the front outer surface of the base (1). Two return springs (17) are fixedly connected to the top outer surfaces of the two support plates (16). Movable plates (18) are fixedly connected to the outer surfaces of the two return springs (17). The other ends of the two pull ropes (15) are fixedly connected to the top outer surfaces of the two movable plates (18).

2. The machine tool hydraulic clamping device according to claim 1, characterized in that: Two symmetrically arranged vertical plates (20) are fixedly connected to the top outer surface of the base (1). Hydraulic cylinders (21) are fixedly installed on the opposite outer surfaces of the two vertical plates (20). The opposite outer surfaces of the two vertical plates (20) are respectively fixedly connected to the driving ends of the two hydraulic cylinders (21). Mounting brackets (22) are fixedly connected to the output ends of the two hydraulic cylinders (21). A support cylinder (23) is fixedly connected to the other end of the mounting bracket (22). A drive shaft (24) is rotatably connected to the inner surface of the support cylinder (23). A drive motor (38) is fixedly installed on the outer surface of the support cylinder (23) near the mounting bracket (22). The output end of the drive motor (38) is fixedly connected to the drive shaft (24). An active bevel gear (25) is fixedly sleeved on the outer surface of the drive shaft (24). The support cylinder (23)... Four lead screws (26) are arranged in a circular array on the inner surface. The outer surfaces of the four lead screws (26) are fixedly fitted with driven bevel gears (27). The four driven bevel gears (27) are movably meshed with the outer surfaces of the driving bevel gears (25). The outer surfaces of the four lead screws (26) are threaded with threaded blocks (28). The outer surfaces of the four threaded blocks (28) are fixedly connected with sliders. The outer surfaces of the four sliders are fixedly connected with connecting blocks (29). The outer surfaces of the four connecting blocks (29) away from the center of the support cylinder (23) are fixedly connected with two support springs (30) and pressure sensors (32). The other end of the support springs (30) is fixedly connected with an arc-shaped top plate (31). The outer surface of the base (1) is equipped with a controller, which is electrically connected to the pressure sensor (32).

3. The machine tool hydraulic clamping device according to claim 1, characterized in that: C-shaped seats (34) are fixedly connected to the opposite outer surfaces of the two connecting cylinders (33). Threaded rods (35) are threaded through the top outer surfaces of the two C-shaped seats (34). A pressure plate (36) is rotatably connected to the bottom outer surface of the threaded rods (35).

4. The machine tool hydraulic clamping device according to claim 1, characterized in that: The bottom inner surface of the base (1) is fixedly connected with four support frames, and the front and rear outer surfaces of the rack (4) are fixedly connected with support bars. The top outer surfaces of the four support frames are provided with balls, and the four support bars are respectively attached to the top outer surfaces of the four balls.

5. A machine tool hydraulic clamping device according to claim 1, characterized in that: The base (1) has through holes on both the left and right outer surfaces, and the area of ​​the through holes is larger than the cross-sectional area of ​​the rack (4) and the support bar as a whole.

6. A machine tool hydraulic clamping device according to claim 1, characterized in that: Two first fixed pulleys are installed on the inner front surface of the base (1), and two second fixed pulleys are installed on the outer front surface of the base (1). The pull rope (15) on the left side is laid on the outer surface of the first and second fixed pulleys on the left side, and the pull rope (15) on the right side is laid on the outer surface of the first and second fixed pulleys on the right side.

7. A machine tool hydraulic clamping device according to claim 1, characterized in that: Two slide rods are fixedly connected to the top outer surfaces of the two support plates (16), two movable plates (18) are respectively sleeved on the outer surfaces of the four slide rods, and four return springs (17) are respectively sleeved on the outer surfaces of the four slide rods.

8. A machine tool hydraulic clamping device according to claim 2, characterized in that: Flanges (37) are fixedly connected to the outer surfaces of both the support cylinder (23) and the connecting cylinder (33).

9. A machine tool hydraulic clamping device according to claim 2, characterized in that: The outer surface of the support cylinder (23) is provided with four sliding grooves, and the four sliders are respectively slidably connected to the inside of the four sliding grooves.

10. A machine tool hydraulic clamping device according to claim 3, characterized in that: Two limiting rods are movably inserted on the top outer surface of the C-shaped seat (34), and the bottom outer surfaces of the two limiting rods are fixedly connected to the top outer surface of the pressure plate (36).

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