A clamping device that automatically switches hydraulic force boosting via CNC control

Abstract

This utility model relates to the field of tooling and fixture technology, and discloses a clamping device that automatically switches hydraulic force amplification via CNC control. It includes a clamp body, with two jaws arranged in a front-to-back configuration at the center of the rear inner wall of the clamp body. Multiple first hexagon socket head caps are located at the center of the rear end face of the rear jaw and the center of the front end face of the front jaw. A clamp cap is located at the front end of the multiple first hexagon socket head caps. The two jaws are connected to the clamp body and the clamp cap respectively by multiple first hexagon socket head caps. A hydraulic cylinder assembly is located inside the clamp cap at one end near the jaw. A small disc spring is fitted on the outer side of the hydraulic cylinder assembly away from the jaw, and a transmission screw assembly is fitted on the outer side of the hydraulic cylinder assembly on the side with the small disc spring. In this utility model, the hydraulic cylinder assembly and transmission screw assembly can be switched under force, making operation simple, and the clutch does not need to bear a large force, resulting in stable and durable operation.

Description

Technical Field

[0001] This utility model relates to the field of tooling and fixture technology, and in particular to a clamping device that automatically switches hydraulic force through CNC control. Background Technology

[0002] Tooling fixtures are tools used in manufacturing to fix and position workpieces. They play a vital role in machining, assembly, welding, and inspection processes. Tooling fixtures are devices used to fix, support, and position workpieces to ensure that the workpieces can be accurately machined or inspected during the processing. They are used to improve production efficiency, ensure machining accuracy, reduce human error, and protect the safety of operators. General tooling clamping devices use manual, hydraulic, and pneumatic methods for clamping.

[0003] Existing clamping devices still have some problems. Pneumatic clamping systems usually rely on compressed air for power. However, air is highly compressible, which means that the clamping force under high pressure is not as stable and powerful as that of hydraulic systems. For machining processes that require high clamping force, pneumatic clamping may not be able to provide sufficient force, affecting machining accuracy and stability. Once the power is cut off or the air supply is interrupted, the air pressure in the system will drop rapidly, causing the clamping force to disappear. Hydraulic clamping requires an external hydraulic control system and requires the laying of complex hydraulic pipelines to connect various components such as hydraulic pumps, valves, and cylinders. After installation, the hydraulic system needs to be precisely debugged to ensure the coordinated operation between the components and avoid problems such as leakage and pressure instability. The operation is relatively cumbersome. Therefore, those skilled in the art have provided a clamping device that automatically switches hydraulic force boosting through CNC control to solve the problems mentioned in the background art. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology and propose a clamping device that automatically switches hydraulic force by CNC control. It adopts a brand-new structure, can switch when under force, is simple to operate, and the clutch does not need to bear a large force. It is stable and durable.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a clamping device that automatically switches hydraulic force by numerical control, comprising a clamp body, wherein two jaws are arranged in a front-to-back pattern at the center of the rear inner wall of the clamp body, and multiple first hexagon socket screws are provided at the center of the rear end face of the jaws and the center of the front end face of the jaws, respectively. A clamp cover is provided at the front end of the multiple first hexagon socket screws, and the two jaws are respectively connected to the clamp body and the clamp cover by multiple first hexagon socket screws. A hydraulic cylinder assembly is provided inside the clamp cover at one end near the jaws, and a small disc spring is sleeved on the outer side of the hydraulic cylinder assembly away from the jaws. A transmission screw assembly is sleeved on the outer side of the hydraulic cylinder assembly on the side of the small disc spring.

[0006] The transmission screw assembly includes a second pad, an outer screw is fitted on the end of the second pad away from the cylinder assembly, a positioning sleeve is provided inside the outer screw on the side near the second pad, an inner screw is provided inside the positioning sleeve, a push rod is slidably connected inside the inner screw, a large spring is fitted on the end of the inner screw away from the second pad, a clutch is fitted on the outer side of the inner screw at the other end of the large spring, a steel ball is provided on the upper surface of the inner screw inside the clutch, a small spring is provided at the end of the push rod, a fourth hexagon socket screw is provided at the end of the inner screw at the end of the inner screw away from the second pad, a handle is fitted on the outer side of the push rod on the side of the clutch away from the second pad, a thrust bearing is fitted on the outer side of the handle away from the clutch, a sleeve is fitted on the outer side of the handle on the side of the thrust bearing away from the clutch, and a retaining ring for the hole is fitted on the outer side of the handle on the side of the sleeve away from the clutch.

[0007] With the above technical solution, when the device is not clamped, the clutch and handle are connected. Turning the handle causes the clutch to rotate, allowing the external screw to move forward or backward within the fixed nut. This, in turn, moves the clamp cover forward or backward. When clamping a workpiece is required, the clamp cover moves forward. When the clamp cover contacts the workpiece and cannot move forward, turning the handle allows the external screw to continue moving forward, compressing the large piston. The forward movement of the large piston compresses the hydraulic oil in the hydraulic cylinder, which then transmits pressure to the small piston, applying a backward pushing force. As the external screw continuously pushes the large piston forward, compressing the hydraulic oil, the backward pushing force on the small piston increases. When this force reaches a certain value, the small piston moves backward, pushing the push rod in the transmission screw assembly backward. Through mechanical interaction... When the push rod moves backward, the steel ball moves upward along the push rod ramp. The clutch ramp moves forward under the force of the steel ball, disengaging the clutch from the handle. Continuing to crank the handle causes the internal screw to move forward through the threaded action, pushing the small piston forward, compressing the hydraulic oil, and increasing the clamping force. When it is necessary to release the workpiece, the clutch and handle are disengaged. Cranking the handle causes the internal screw to move backward, pushing the small piston backward by the hydraulic oil, reducing the hydraulic oil pressure and decreasing the clamping force of the clamp cover. When the internal screw returns to a certain position and the pressure is released, the large spring pushes the clutch backward, and the small spring pushes the push rod forward. The steel ball and push rod return to their original positions, and the clutch and handle reconnect. Continuing to rotate the handle causes the external screw to rotate, moving the entire device backward and thus releasing the workpiece.

[0008] Furthermore, a large disc spring is fitted at the end of the external lead screw away from the second pad, and a coupling is provided at the end of the external lead screw on the side of the large disc spring away from the second pad. An end cover is fitted on the outside of the coupling and the large disc spring. A speed reducer is provided on one side wall of the end cover. A second hexagon socket screw is provided at both the upper and lower ends of the output end of the speed reducer. The speed reducer is connected to the end cover through multiple second hexagon socket screws. A servo motor is fixedly connected to the input end of the speed reducer.

[0009] Through the above technical solution, the reducer can reduce the speed of the servo motor and increase the torque of the servo motor. The servo motor drives the handle to rotate, and the device moves forward and backward to clamp and release the workpiece.

[0010] Furthermore, the cylinder assembly includes a cylinder liner, a cylinder plug is provided at one end of the cylinder liner near the jaws, a large piston is provided at the end of the cylinder liner away from the cylinder plug, a first gasket is fitted on the outer wall of the large piston near the cylinder plug, a large oil seal is fitted on the outer wall of the large piston near the cylinder plug, and a small piston is provided at the end of the large piston away from the cylinder plug. The small piston passes through one end face of the large piston and extends into the interior of the large piston, and a small oil seal is fitted on its outer wall.

[0011] Through the above technical solution, the large piston and the small piston achieve a pressurization effect through Bernoulli's principle.

[0012] Furthermore, a nut is fitted on the outer side wall of the lead screw inside the clamp cover, and an internal thread is provided on the upper part of the inner side wall of the nut. The nut is slidably connected to the clamp body in the middle and on both sides, and a first pin hole is provided on the lower part of the nut.

[0013] The above technical solution facilitates the connection of the transmission screw assembly to the equipment via a lead screw nut.

[0014] Furthermore, the clamp body has two guide rails arranged laterally on one inner side wall near the clamp cover. Multiple second pin holes are arranged in a front-to-back pattern at the center of one side wall of each of the two guide rails. A movable pin is provided on the upper end face of one of the guide rails near the clamp jaws. The clamp cover has pressure plates at both the upper and lower ends on one end face near the two guide rails. Multiple hexagonal bolts are provided on one end face of each of the two pressure plates near the two guide rails. The multiple hexagonal bolts pass through one end face of each of the two pressure plates and are threaded to one end face of the clamp cover.

[0015] The above technical solution involves two pressure plates that fit together with the clamp cover and are sleeved on the outside of the two guide rails.

[0016] Furthermore, the two pressure plates are slidably connected to the outside of the two guide rails respectively;

[0017] The above technical solution facilitates the movement of the clamp cover back and forth along the two guide rails.

[0018] Furthermore, four positioning keys are provided at the rear center of the lower end face of the clamp body. Each of the four positioning keys has a slotted cylindrical head screw on its lower end face. The four slotted cylindrical head screws pass through the four positioning keys and extend to the upper end of the four positioning keys, and their ends are threaded to the lower end face of the clamp body.

[0019] The above technical solution facilitates the connection of the device with other devices.

[0020] This utility model has the following beneficial effects:

[0021] In this utility model, the clamping device with automatic switching of hydraulic force amplification by CNC control is equipped with a cylinder assembly and a transmission screw assembly. It can switch when under force, which is simple to operate, and the clutch does not need to bear a large force, and the function is stable and durable. Attached Figure Description

[0022] Figure 1 This is a perspective view of a clamping device that automatically switches hydraulic force by numerical control, as proposed in this utility model.

[0023] Figure 2 This is a top sectional view of a clamping device that automatically switches hydraulic force by numerical control, as proposed in this utility model.

[0024] Figure 3 This is a front view of a clamping device that automatically switches hydraulic force by numerical control, as proposed in this utility model.

[0025] Figure 4 A top sectional view of a clamping device transmission screw assembly that automatically switches hydraulic force amplification via CNC control, as proposed in this utility model.

[0026] Figure 5 This is a top sectional view of a hydraulic cylinder assembly of a clamping device that automatically switches hydraulic force boosting via CNC control, as proposed in this utility model.

[0027] Legend:

[0028] 1. Clamp body; 2. Clamp cover; 3. Reducer; 4. Servo motor; 5. Clamp jaws; 6. First hex socket head cap screw; 7. Coupling; 8. Large disc spring; 9. Hydraulic cylinder assembly; 10. Drive screw assembly; 11. Small disc spring; 12. Nut; 13. End cap; 14. Second hex socket head cap screw; 15. Locating key; 16. Slotted cylindrical head screw; 17. Moving pin; 18. Hex bolt; 19. Pressure plate; 20. Guide rail;

[0029] 901. Cylinder liner; 902. Cylinder plug; 903. Large piston; 904. First gasket; 905. Large oil seal; 906. Small piston; 907. Small oil seal;

[0030] 1001, Second pad; 1002, External lead screw; 1003, Positioning sleeve; 1004, Large spring; 1005, Clutch; 1006, Handle; 1007, Sleeve; 1008, Hole retaining ring; 1009, Fourth internal hex screw; 1010, Small spring; 1011, Thrust bearing; 1012, Steel ball; 1013, Internal lead screw; 1014, Push rod. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figure 1-5 The present invention provides an embodiment of a clamping device that automatically switches hydraulic force by numerical control, comprising a clamp body 1. Two jaws 5 are arranged in a front-to-back pattern at the center of the rear inner wall of the clamp body 1. Multiple first hexagon socket screws 6 are provided at the center of the rear end face of the jaw 5 and the center of the front end face of the jaw 5. A clamp cover 2 is provided at the front end of the multiple first hexagon socket screws 6. The two jaws 5 are respectively connected to the clamp body 1 and the clamp cover 2 by multiple first hexagon socket screws 6. A hydraulic cylinder assembly 9 is provided inside the clamp cover 2 at one end near the jaw 5. A small disc spring 11 is sleeved on the side of the outer wall of the hydraulic cylinder assembly 9 away from the jaw 5. A transmission screw assembly 10 is sleeved on the outer side of the hydraulic cylinder assembly 9 on the side of the small disc spring 11.

[0033] The transmission screw assembly 10 includes a second pad 1001. An outer screw 1002 is fitted onto the end of the second pad 1001 furthest from the cylinder assembly 9. A positioning sleeve 1003 is located inside the outer screw 1002, near the side of the second pad 1001. An inner screw 1013 is located inside the positioning sleeve 1003. A push rod 1014 is slidably connected inside the inner screw 1013. A large spring 1004 is fitted onto the end of the inner screw 1013 furthest from the second pad 1001. A clutch 1005 is fitted onto the outer side of the inner screw 1013 at the other end of the large spring 1004. A steel ball 10 is located on the upper surface of the inner screw 1013 inside the clutch 1005. 12. A small spring 1010 is provided at the end of the push rod 1014. A fourth internal hex screw 1009 is provided at the end of the lead screw 1013 on the side of the small spring 1010 away from the second pad 1001. A handle 1006 is sleeved on the outside of the push rod 1014 on the side of the clutch 1005 away from the second pad 1001. A thrust bearing 1011 is sleeved on the outside of the handle 1006 away from the clutch 1005. A sleeve 1007 is sleeved on the outside of the handle 1006 on the side of the thrust bearing 1011 away from the clutch 1005. A retaining ring 1008 for holes is sleeved on the outside of the handle 1006 on the side of the sleeve 1007 away from the clutch 1005.

[0034] When the device is not clamped, the clutch 1005 and the handle 1006 are connected. Turning the handle 1006 causes the clutch 1005 to rotate the external lead screw 1002, allowing the external lead screw 1002 to move forward or backward within the fixed nut 12. This, in turn, moves the clamp cover 2 forward or backward. When clamping a workpiece is required, the clamp cover 2 is moved forward. When the clamp cover 2 contacts the workpiece and cannot move forward, turning the handle causes the external lead screw 1002 to continue moving forward, compressing the large piston 903. The large piston 903 then moves forward. The movement compresses the hydraulic oil in the hydraulic cylinder, which then transmits pressure to the small piston 906, applying a backward pushing force to it. As the external lead screw 1002 continuously pushes the large piston 903 forward, compressing the hydraulic oil, the backward pushing force on the small piston 906 increases. When this force reaches a certain value, the small piston 906 moves backward, pushing the push rod 1014 in the transmission lead screw assembly 10 backward. Through mechanical interaction, the push rod 1014 moves backward, and the steel ball 1012 moves upward along the ramp of the push rod 1014. As the clutch 1005 moves forward under the force of the steel ball 1012, it disengages from the handle 1006. Continuing to crank the handle 1006 causes the internal screw 1013 to move forward via the threaded action, thus pushing the small piston 906 forward, compressing the hydraulic oil and increasing the clamping force. When it is necessary to release the workpiece, the clutch 1005 and handle 1006 are disengaged. Cranking the handle 1006 causes the internal screw 1013 to move backward. The small piston 906 is pushed backward by the hydraulic oil, reducing the hydraulic oil pressure and the clamping force of the clamp cover 2. When the inner screw 1013 returns to a certain position to release the pressure, the large spring 1004 pushes the clutch 1005 backward, and the small spring 1010 pushes the push rod 1014 forward. The steel ball 1012 returns to its original position with the push rod 1014, and the clutch 1005 is connected to the handle 1006. The handle 1006 continues to rotate, and the handle 1006 drives the outer screw 1002 to rotate, causing the entire device to move backward, thereby releasing the workpiece.

[0035] like Figure 2 and 4 As shown, a large disc spring 8 is fitted at the end of the external lead screw 1002 away from the second pad 1001. A coupling 7 is provided at the end of the external lead screw 1002 on the side of the large disc spring 8 away from the second pad 1001. An end cover 13 is fitted on the outside of the coupling 7 and the large disc spring 8. A reducer 3 is provided on one side wall of the end cover 13. Multiple second hexagon socket screws 14 are provided at both the upper and lower ends of the output end of the reducer 3. The reducer 3 is connected to the end cover 13 through the multiple second hexagon socket screws 14. A servo motor 4 is fixedly connected to the input end of the reducer 3. The reducer 3 can reduce the speed of the servo motor 4 and increase the torque of the servo motor 4. The servo motor 4 drives the handle 1006 to rotate, and the device moves forward to pre-clamp the workpiece.

[0036] like Figure 2and 5 As shown, the cylinder assembly 9 includes a cylinder liner 901. A cylinder plug 902 is provided at one end of the cylinder liner 901 near the jaw 5. A large piston 903 is provided at the end of the cylinder liner 901 away from the cylinder plug 902. A first gasket 904 is fitted on the outer wall of the end of the large piston 903 near the cylinder plug 902. A large oil seal 905 is fitted on the outer wall of the large piston 903 at the end of the first gasket 904 near the cylinder plug 902. A small piston 906 is provided at the end of the large piston 903 away from the cylinder plug 902. The small piston 906 passes through one end face of the large piston 903 and extends into the interior of the large piston 903. A small oil seal 907 is fitted on its outer wall. The large piston 903 will push the small piston 906 to move.

[0037] A nut 12 is fitted on the outer wall of the lead screw 1002 inside the clamp cover 2. The inner wall of the nut 12 has an internal thread near the top. The nut 12 is slidably connected to the clamp body 1 in the middle and on both sides. The lower part of the nut 12 has a first pin hole, which facilitates the connection of the transmission lead screw assembly 10 to the equipment through the nut 12.

[0038] like Figure 1 , 2 As shown in Figure 3, two guide rails 20 are arranged laterally on the inner side wall of the clamp body 1 near the clamp cover 2. Multiple second pin holes are arranged front to back at the center of one side wall of each guide rail 20. A movable pin 17 is provided on the side of the upper end face of one guide rail 20 near the clamp jaw 5. The clamp cover 2 is provided with pressure plates 19 at both the upper and lower ends on one end face near the two guide rails 20. Multiple hexagonal bolts 18 are provided on the end face of each pressure plate 19 near the two guide rails 20. The multiple hexagonal bolts 18 pass through one end face of each pressure plate 19 and are threaded to one end face of the clamp cover 2. The clamp cover 2 is fitted on the outside of the two guide rails 20 through the cooperation of the two pressure plates 19 and the clamp cover 2. The two pressure plates 19 are slidably connected to the outside of the two guide rails 20, which facilitates the clamp cover 2 to move back and forth along the two guide rails 20.

[0039] Four positioning keys 15 are provided at the rear center of the lower end face of the clamp body 1. Each of the four positioning keys 15 has a slotted cylindrical head screw 16 on its lower end face. The four slotted cylindrical head screws 16 pass through the four positioning keys 15 and extend to the upper end of the four positioning keys 15, and their ends are threaded to the lower end face of the clamp body 1, which facilitates the connection of the equipment with other equipment.

[0040] Working principle: Fix the screw nut 12 and rotate the handle 1006. At this time, the clutch 1005 and the handle 1006 are engaged. The handle 1006 drives the outer screw 1002 to rotate, thereby driving the entire device to move forward or backward. When clamping the workpiece, the workpiece is pre-tightened first. The pressure of the large piston 903 will push the small piston 906 to move backward, pushing the push rod 1014 to move backward. The steel ball 1012 located on the inclined surface of the push rod 1014 will move upward, thereby pushing the clutch 1005 to move forward, so that the clutch 1005 and the handle 1006 are disengaged. Continue to rotate the handle 1006, which will only cause the inner screw 1013 to move forward. The inner screw 1013 pushes the small piston 906 to move forward to achieve hydraulic force amplification.

[0041] When released, the handle 1006 and the external lead screw 1002 are in a disengaged state. Turning the handle 1006 will cause the internal lead screw 1013 to move backward, releasing the pressure. The large spring 1004 pushes the clutch 1005 backward, and the small spring 1010 pushes the push rod 1014 forward, connecting the clutch 1005 and the handle 1006. The steel ball 1012 and the push rod 1014 return to their original positions. Continuing to turn the handle 1006 will cause the handle 1006 to drive the external lead screw 1002 to rotate, causing the entire device to move backward, thereby releasing the workpiece.

[0042] The servo control system of the control equipment consists of a reducer 3, a servo motor 4, a servo driver, a control unit, and a power switch. The control unit has touch screen and PLC functions. The reducer 3 can reduce the speed of the servo motor 4 and increase its torque. The control unit can control the servo motor 4 and read its status through the servo driver. The control unit sets the actions and internal parameters. The workpiece clamping is divided into two steps: pre-clamping and hydraulic force increase. The servo motor 4 drives the handle 1006 to rotate, and the device moves forward to pre-clamp the workpiece. As the resistance increases, the torque of the servo motor 4 also increases. When the torque increases to the preset value, the servo motor 4 stops, the clutch 1005 disengages from the handle 1006, and the servo motor 4 restarts to perform hydraulic force increase. When the set value is reached, the workpiece clamping is achieved. When releasing, the servo motor 4 reverses, driving the device to move backward. When the backward position reaches the set value, the workpiece clamping is stopped. This control and program is a commonly used control method in existing control systems and will not be elaborated on further here.

[0043] The control unit has a reserved signal interface, which can be connected to automated equipment such as machining centers to realize automated production.

[0044] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A clamping device that automatically switches hydraulic force via CNC control, comprising a clamp body (1), characterized in that: Two jaws (5) are arranged in a front-to-back arrangement at the center of the rear inner wall of the clamp body (1). Multiple first hexagonal screws (6) are provided at the center of the rear end face of the jaw (5) and the center of the front end face of the jaw (5) at the front. A clamp cover (2) is provided at the front end of the multiple first hexagonal screws (6). The two jaws (5) are connected to the clamp body (1) and the clamp cover (2) respectively through multiple first hexagonal screws (6). A hydraulic cylinder assembly (9) is provided inside the clamp cover (2) at one end near the jaw (5). A small disc spring (11) is sleeved on the side of the outer wall of the hydraulic cylinder assembly (9) away from the jaw (5). A transmission screw assembly (10) is sleeved on the outer side of the hydraulic cylinder assembly (9) on the side of the small disc spring (11). The transmission screw assembly (10) includes a second pad (1001). An outer screw (1002) is fitted at one end of the second pad (1001) away from the cylinder assembly (9). A positioning sleeve (1003) is provided inside the outer screw (1002) on one side near the second pad (1001). An inner screw (1013) is provided inside the positioning sleeve (1003). A push rod (1014) is slidably connected inside the inner screw (1013). A large spring (1004) is fitted at one end of the inner screw (1013) away from the second pad (1001). A clutch (1005) is fitted on the outer side of the inner screw (1013) at the other end of the large spring (1004). A steel ball (1) is provided on the upper surface of the inner screw (1013) inside the clutch (1005). 012), the end of the push rod (1014) is provided with a small spring (1010), the end of the small spring (1010) away from the second pad (1001) is provided with a fourth internal hexagon screw (1009), the outer side of the push rod (1014) away from the second pad (1001) of the clutch (1005) is provided with a handle (1006), the outer side of the handle (1006) away from the clutch (1005) is provided with a thrust bearing (1011), the outer side of the handle (1006) away from the clutch (1005) is provided with a sleeve (1007), and the outer side of the handle (1007) away from the clutch (1005) is provided with a retaining ring (1008).

2. The clamping device for automatically switching hydraulic force amplification via CNC control according to claim 1, characterized in that: A large disc spring (8) is fitted at the end of the external lead screw (1002) away from the second pad (1001). A coupling (7) is provided at the end of the external lead screw (1002) on the side of the large disc spring (8) away from the second pad (1001). An end cover (13) is fitted on the outside of the coupling (7) and the large disc spring (8). A speed reducer (3) is provided on one side wall of the end cover (13). Multiple second internal hexagon screws (14) are provided at both the upper and lower ends of the output end of the speed reducer (3). The speed reducer (3) is connected to the end cover (13) through multiple second internal hexagon screws (14). A servo motor (4) is fixedly connected to the input end of the speed reducer (3).

3. The clamping device for automatically switching hydraulic force amplification via CNC control according to claim 1, characterized in that: The cylinder assembly (9) includes a cylinder liner (901). A cylinder plug (902) is provided at one end of the cylinder liner (901) near the jaw (5). A large piston (903) is provided at the end of the cylinder liner (901) away from the cylinder plug (902). A first gasket (904) is provided on the outer wall of the end of the large piston (903) near the cylinder plug (902). A large oil seal (905) is provided on the outer wall of the large piston (903) near the cylinder plug (902). A small piston (906) is provided at the end of the large piston (903) away from the cylinder plug (902). The small piston (906) penetrates one end face of the large piston (903) and extends into the interior of the large piston (903). A small oil seal (907) is provided on the outer wall of the small piston (906).

4. A clamping device for automatically switching hydraulic force boosting via CNC control according to claim 1, characterized in that: A nut (12) is fitted on the outer side wall of the lead screw (1002) inside the clamp cover (2). The inner side wall of the nut (12) is provided with an internal thread near the top. The nut (12) is slidably connected to the clamp body (1) in the middle and on both sides. The lower part of the nut (12) has a first pin hole.

5. A clamping device for automatically switching hydraulic force amplification via CNC control according to claim 1, characterized in that: The clamp body (1) has two guide rails (20) arranged horizontally on one inner side wall near the clamp cover (2). Multiple second pin holes are arranged in the center of one side wall of each of the two guide rails (20). A movable pin (17) is provided on the side of the upper end face of one guide rail (20) near the clamp jaw (5). The clamp cover (2) has pressure plates (19) at both ends on one end face near the two guide rails (20). Multiple hexagonal bolts (18) are provided on one end face of each pressure plate (19) near the two guide rails (20). The multiple hexagonal bolts (18) pass through one end face of each pressure plate (19) and are threaded to one end face of the clamp cover (2).

6. A clamping device for automatically switching hydraulic force amplification via CNC control according to claim 5, characterized in that: The two pressure plates (19) slide on the outside of the two guide rails (20), respectively.

7. A clamping device for automatically switching hydraulic force amplification via CNC control according to claim 1, characterized in that: The clamp body (1) has four positioning keys (15) located at the rear center of the lower end face. The lower end face of each of the four positioning keys (15) is provided with a slotted cylindrical head screw (16). The four slotted cylindrical head screws (16) pass through the four positioning keys (15) and reach the upper end of the four positioning keys (15), and their ends are threaded to the lower end face of the clamp body (1).

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