A high-low pressure adjustable hydraulic chuck and its adjusting method

Abstract

The application discloses a high-low pressure adjustable hydraulic chuck and an adjusting method thereof, and belongs to the technical field of hydraulic chucks. The high-low pressure adjustable hydraulic chuck comprises a device base, four clamping blocks are uniformly distributed on the outer side of the device base, a transmission block is provided with a transmission column on one side thereof, the transmission column is rotationally connected with one end of the transmission block through a second rotation connecting shaft, and the other end of the transmission block is rotationally connected with a transmission frame through a first rotation connecting shaft. The application solves the problem that the existing drill rod hydraulic chuck cannot timely adjust the internal pressure according to the size of the clamped article, the rotation angle of the second rotation connecting shaft is detected through a rotation sensor, and the first hydraulic pump and the second hydraulic pump are started or the second hydraulic pump is started alone, so that the consumption of the motor is avoided, and the power supply demand during the use of the device is improved.

Description

Technical Field

[0001] This invention relates to the field of hydraulic chuck technology, specifically to a hydraulic chuck with adjustable high and low pressure and its adjustment method. Background Technology

[0002] A hydraulic chuck is a mechanical device used to fix workpieces during machining. It typically consists of a hydraulic cylinder and a clamping plate. The hydraulic cylinder provides hydraulic pressure, while the clamping plate holds the workpiece in place. Hydraulic chucks offer advantages such as simple operation, high clamping force, and high precision, and are therefore widely used in machine tools.

[0003] Chinese patent CN211573427U discloses a drill pipe hydraulic chuck, including a chuck housing, a front end cover and a rear end cover respectively disposed at two ends of the chuck housing; the chuck housing is provided with a chuck spindle, a slip slidably engaged with the chuck spindle, a slip sleeve slidably engaged with the slip, and a high-pressure oil chamber mechanism disposed between the slip sleeve and the chuck housing for driving the axial movement of the slip sleeve and thus driving the radial movement of the slip. The drill pipe hydraulic chuck of this technical solution does not have a rubber sleeve, which solves the problem of the rubber sleeve of the existing hydraulic rubber sleeve chuck being easily damaged and requiring frequent replacement of the rubber sleeve, greatly improving the service life of the chuck, ensuring the reliability of the power head, and at the same time, it has a simple structure, high reliability, long service life, large torque transmission, and convenient replacement of parts.

[0004] In actual use, the hydraulic chuck of the drill pipe described in the above patent cannot adjust the internal pressure in a timely manner according to the size of the object being clamped during the transmission process. The inability to adjust the internal pressure according to the object will reduce the clamping stability during actual use. Therefore, it does not meet the existing requirements. To address this, we propose a hydraulic chuck with adjustable high and low pressure and its adjustment method. Summary of the Invention

[0005] The purpose of this invention is to provide a hydraulic chuck with adjustable high and low pressure and its adjustment method. A rotation sensor detects the rotation angle of the second rotating connecting shaft. The detected rotation angle roughly determines the size of the object to be clamped. Based on the size of the object, the first and second hydraulic pumps are simultaneously activated, or the second hydraulic pump is activated alone, to extract the medium stored in the device base and deliver the medium between the limiting plate and the support cylinder. Once delivery is complete, the limiting plate is pushed to clamp and fix the object. The hydraulic pressure is adjusted according to the size of the object being gripped. This adjustment can adapt to different usage needs and reduces the need for simultaneous activation of the first and second hydraulic pumps, avoiding excessive motor consumption and increasing the power supply requirements during device use. This solves the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a hydraulic chuck with adjustable high and low pressure, comprising a device base, wherein four clamping blocks are evenly distributed in a ring on one side of the outer side of the device base, and a transmission frame is provided at one end of each of the four clamping blocks;

[0007] It also includes a transmission block, which is disposed on one side outside the transmission frame. A transmission column is disposed on one side outside the transmission block. The transmission column is rotatably connected to one end of the transmission block through a second rotating connecting shaft. The other end of the transmission block is rotatably connected to the transmission frame through a first rotating connecting shaft. A total of four second rotating connecting shafts are provided. One end of one of the second rotating connecting shafts is provided with a rotation sensor, and the detection end of the rotation sensor is fixedly connected to the second rotating connecting shaft. The outside of the rotation sensor is fixedly connected to the transmission column by bolts.

[0008] Preferably, a first hydraulic pump is provided on one side of the device base, a second hydraulic pump is provided on one side between the first hydraulic pump and the device base, and a third hydraulic pump is provided between the second hydraulic pump and the device base. The lower ends of the first hydraulic pump, the second hydraulic pump and the third hydraulic pump are all fixedly connected to one side of the device base by bolts.

[0009] Preferably, a support cylinder is provided between the device base and the clamping block, the clamping block is located on one side outside the support cylinder, the transmission column is located inside the support cylinder, the second hydraulic pump is sealed to the support cylinder through a second transmission pipe, the third hydraulic pump is sealed to the support cylinder through a first transmission pipe, and the first hydraulic pump is sealed to the second transmission pipe through a third transmission pipe.

[0010] Preferably, a limiting plate is provided at one end of the transmission column, and the limiting plate and one end of the transmission column are integrally formed. A sliding through hole is provided inside the clamping block. The sliding through hole extends through and to the upper and lower ends of the clamping block. A sliding block is provided inside the sliding through hole. The outside of the sliding block is connected to the slot of the sliding through hole. The sliding block and the support cylinder are integrally formed.

[0011] Preferably, one side of one of the clamping blocks is provided with a transmission frame, the inside of the transmission frame is provided with a transmission threaded rod, one end of the transmission threaded rod is provided with a rotating handle, and the rotating handle is fixedly connected to one end of the transmission threaded rod. The lower end of the transmission threaded rod is rotatably connected to the lower end inside the transmission frame. A transmission ring is provided on one side outside the transmission threaded rod, and the inside of the transmission ring is engaged with the external thread of the transmission threaded rod.

[0012] Preferably, a longitudinal transmission rod is provided on one side of the upper end of the transmission ring, and a fixing plate is provided at the upper end of the longitudinal transmission rod. The fixing plate, the longitudinal transmission rod and the transmission ring are welded and fixed together in sequence.

[0013] Preferably, a second pressure sensor is provided at the lower end of the fixed plate, and the upper end of the second pressure sensor is fixedly connected to the lower end of the fixed plate by bolts. Both the second pressure sensor and the rotation sensor are electrically connected to the first hydraulic pump and the second hydraulic pump.

[0014] Preferably, a first pressure sensor is provided at the upper end of one side of the rotation sensor, and the first pressure sensor is electrically connected to the first hydraulic pump and the second hydraulic pump.

[0015] Preferably, the transmission ring is provided with a longitudinal sliding rail on its outside, and the longitudinal sliding rail extends into the interior of the transmission frame, and the transmission ring is connected to the transmission frame groove.

[0016] A hydraulic chuck with adjustable high and low pressure and its adjustment method, including the following steps:

[0017] Step 1: Start the third hydraulic pump and have the user manually pull the clamping block to extend it to its maximum position, then place the clamping position between the four clamping blocks.

[0018] Step 2: Start the second hydraulic pump. The second hydraulic pump draws liquid from inside the device base and delivers it to the device base through the second transmission pipe, squeezing the limiting plate.

[0019] Step 3: After the limiting piece is squeezed, the second rotating connecting shaft will pull the transmission block. The transmission block will pull the transmission frame through the first rotating connecting shaft. The transmission frame will pull the clamping block at one end, so that the clamping block slides outside the sliding block through the sliding through hole.

[0020] Step 4: The four clamping blocks are pulled and moved relative to each other to complete the contact and clamping of the outer wall of the item. During the pulling process of the transmission block, the rotation sensor detects the rotation angle of the second rotation connecting shaft. When the detected rotation angle is less than 45 degrees, it is considered that the clamping of the item between the four clamping blocks is too large.

[0021] Step 5: The rotation sensor will give the first hydraulic pump a start signal. The first hydraulic pump starts in the same way as the second hydraulic pump to draw liquid from the base of the device, and transport the liquid through the third transmission pipe to the second transmission pipe and into the support cylinder together. Once inside the support cylinder, it further pushes the limiting plate.

[0022] Step 6: After the clamping block is fixed, rotate the handle to drive the transmission threaded rod to rotate. The rotation of the transmission threaded rod and the transmission ring will generate relative motion. After the transmission ring is restricted by the longitudinal sliding rail, the rotational motion will change into longitudinal linear motion.

[0023] Step 7: The longitudinal linear motion of the transmission ring will drive the fixed plate to adjust its longitudinal position through the longitudinal transmission rod. The movement of the fixed plate can drive the second pressure sensor, so that the second pressure sensor is in contact with the upper end of the clamping block.

[0024] Step 8: During the rotation of the clamping block, the inertia of the clamping block and the clamped item will cause shaking. After the shaking occurs, it will be detected by the second pressure sensor, and the user can manually adjust the starting power of the first hydraulic pump and the second hydraulic pump.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1. This invention features a transmission block positioned between the transmission frame and the transmission column. One end of the transmission block is rotatably connected to the transmission frame via a first rotating connecting shaft, and the other end is rotatably connected to the transmission column via a second rotating connecting shaft. A rotation sensor is mounted on one end of the second rotating connecting shaft. In actual use, after the object is clamped and fixed by the clamping blocks, the second rotating connecting shaft rotates as the four clamping blocks move relative to each other and clamp in four directions. The rotation angle of the second rotating connecting shaft is detected by the rotation sensor. The size of the object to be clamped is roughly determined based on the detected rotation angle. Depending on the size of the object, the first and second hydraulic pumps are activated simultaneously, or the second hydraulic pump is activated alone, to extract the medium stored in the device base and deliver the medium between the limiting plate and the support cylinder. Once the delivery is complete, the limiting plate is pushed to clamp and fix the object. The hydraulic pressure is adjusted according to the size of the object being gripped. This adjustment can adapt to different usage requirements and reduces the need to simultaneously activate the first and second hydraulic pumps, thus avoiding excessive motor consumption and increasing the power supply requirements during device use.

[0027] 2. This invention features a transmission frame on one side of the clamping block, a transmission threaded rod inside the transmission frame, a transmission ring on one side of the transmission threaded rod, a longitudinal transmission rod on one side of the upper end of the transmission ring, a fixing plate at one end of the longitudinal transmission rod, and a second pressure sensor between the fixing plate and the clamping block. After the four clamping blocks clamp an item, the position of the fixing plate is adjusted by rotating the transmission threaded rod, causing the fixing plate to drive the second pressure sensor to contact the clamping block. The second pressure sensor detects the position of the clamping block during rotation, and can detect whether the clamping block shakes or shifts position during rotation. This detection allows the user to adjust the starting of the first and second hydraulic pumps, as well as their starting power, in a timely manner. Attached Figure Description

[0028] Figure 1 This is a perspective view of the overall external structure of the present invention;

[0029] Figure 2This is a cross-sectional view of the internal structure of the support cylinder of the present invention;

[0030] Figure 3 This is a perspective view of the positional relationship of the rotation sensor of the present invention;

[0031] Figure 4 For the present invention Figure 3 Enlarged view of a portion of region A in the middle;

[0032] Figure 5 This is a schematic diagram showing the positional relationship of the fixing plate and the internal structure of the transmission frame of the present invention;

[0033] Figure 6 For the present invention Figure 5 Enlarged view of a portion of region B in the middle;

[0034] Figure 7 This is a perspective view of the positional relationship of the second pressure sensor of the present invention.

[0035] In the diagram: 1. Device base; 2. First hydraulic pump; 3. Second hydraulic pump; 4. Third hydraulic pump; 5. First transmission pipe; 6. Second transmission pipe; 7. Third transmission pipe; 8. Support cylinder; 9. Clamping block; 10. Sliding block; 11. Sliding through hole; 12. Transmission frame; 13. First rotating connecting shaft; 14. Transmission block; 15. Second rotating connecting shaft; 16. Transmission column; 18. Limiting plate; 19. First pressure sensor; 20. Rotation sensor; 21. Transmission frame; 22. Transmission threaded rod; 23. Rotating handle; 24. Longitudinal sliding rail; 25. Longitudinal transmission rod; 26. Fixing plate; 27. Transmission ring; 28. Second pressure sensor. Detailed Implementation

[0036] 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.

[0037] To address the issue of the drill pipe hydraulic chuck disclosed in Chinese Patent Publication No. CN211573427U, which fails to adjust its internal pressure in a timely manner according to the size of the object being clamped during transmission, resulting in reduced clamping stability during actual use, please refer to [the relevant documentation / reference]. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7This embodiment provides the following technical solution:

[0038] A hydraulic chuck with adjustable high and low pressure includes a device base 1. Four clamping blocks 9 are evenly distributed in a ring on one side of the outer surface of the device base 1, and a transmission frame 12 is provided at one end of each of the four clamping blocks 9. It also includes a transmission block 14 disposed on one side of the outer surface of the transmission frame 12. A transmission column 16 is provided on one side of the outer surface of the transmission block 14. The transmission column 16 is rotatably connected to one end of the transmission block 14 via a second rotating connecting shaft 15. The other end of the transmission block 14 is rotatably connected to the transmission frame 12 via a first rotating connecting shaft 13. The second rotating connecting shaft 13... There are four hydraulic pumps in total. One of them has a rotation sensor 20 installed at one end of the second rotating connecting shaft 15, and the detection end of the rotation sensor 20 is fixedly connected to the second rotating connecting shaft 15. The outside of the rotation sensor 20 is fixedly connected to the transmission column 16 by bolts. A first hydraulic pump 2 is installed on one side of the device base 1. A second hydraulic pump 3 is installed on one side between the first hydraulic pump 2 and the device base 1. A third hydraulic pump 4 is installed between the second hydraulic pump 3 and the device base 1. The lower ends of the first hydraulic pump 2, the second hydraulic pump 3, and the third hydraulic pump 4 are all connected to the device base 1. One side of the base 1 is fixedly connected by bolts. A support cylinder 8 is provided between the device base 1 and the clamping block 9. The clamping block 9 is located on one side outside the support cylinder 8. The transmission column 16 is located inside the support cylinder 8. The second hydraulic pump 3 is sealed to the support cylinder 8 through the second transmission pipe 6. The third hydraulic pump 4 is sealed to the support cylinder 8 through the first transmission pipe 5. The first hydraulic pump 2 is sealed to the second transmission pipe 6 through the third transmission pipe 7. The rotation angle of the second rotation connecting shaft 15 is detected by the rotation sensor 20. The size of the clamped item is roughly determined based on the detected rotation angle. Depending on the size of the item, the first hydraulic pump 2 and the second hydraulic pump 3 are started simultaneously or the second hydraulic pump 3 is started alone to extract the medium stored in the device base 1 and transport the medium between the limiting plate 18 and the support cylinder 8. After the transport is completed, the limiting plate 18 is pushed to clamp and fix the item. The hydraulic intensity is adjusted according to the size of the gripped item. The intensity adjustment can adapt to different usage needs and reduce the simultaneous start of the first hydraulic pump 2 and the second hydraulic pump 3, avoiding the consumption of a large amount of motor and increasing the power supply requirements when the device is in use.

[0039] To address the issue that existing devices do not detect vibrations generated during rotation, and thus fail to detect and adjust the internal fluid strength, please refer to [link to relevant documentation]. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 This embodiment provides the following technical solution:

[0040] One of the clamping blocks 9 has a transmission frame 21 on one side. Inside the transmission frame 21 is a transmission threaded rod 22. One end of the transmission threaded rod 22 has a rotating handle 23, which is fixedly connected to one end of the transmission threaded rod 22. The lower end of the transmission threaded rod 22 is rotatably connected to the lower end inside the transmission frame 21. A transmission ring 27 is provided on one side of the outer side of the transmission threaded rod 22, and the inner thread of the transmission ring 27 engages with the outer thread of the transmission threaded rod 22. A longitudinal transmission rod 25 is provided on one side of the upper end of the transmission ring 27, and a fixing plate 26 is provided on the upper end of the longitudinal transmission rod 25. The fixing plate 26, the longitudinal transmission rod 25, and the transmission ring 27 are sequentially welded and fixed together. A second pressure sensor 28 is provided on the lower end of the fixing plate 26, and the upper end of the second pressure sensor 28 is connected to the lower end of the fixing plate 26. The two hydraulic pumps are fixedly connected by bolts. The second pressure sensor 28 and the rotation sensor 20 are electrically connected to the first hydraulic pump 2 and the second hydraulic pump 3. The transmission ring 27 is provided with a longitudinal sliding rail 24 on its outside, and the longitudinal sliding rail 24 extends into the inside of the transmission frame 21. The transmission ring 27 is connected to the transmission frame 21 in a slot. The position of the fixed plate 26 is adjusted by rotating the transmission threaded rod 22, so that the fixed plate 26 drives the second pressure sensor 28 to fit against the clamping block 9. The position of the clamping block 9 is detected by the second pressure sensor 28 during the rotation. The second pressure sensor 28 can detect whether the clamping block 9 shakes or shifts in position during the rotation. The detection allows the user to adjust the start of the first hydraulic pump 2 and the second hydraulic pump 3, as well as the start power of the first hydraulic pump 2 and the second hydraulic pump 3 in a timely manner.

[0041] A limiting piece 18 is provided at one end of the transmission column 16, and the limiting piece 18 and one end of the transmission column 16 are integrally formed. A sliding through hole 11 is provided inside the clamping block 9. The sliding through hole 11 passes through and extends to the upper and lower ends of the clamping block 9. A sliding block 10 is provided inside the sliding through hole 11. The outside of the sliding block 10 is connected to the sliding through hole 11 through a slot. The sliding block 10 and the support cylinder 8 are integrally formed. The clamping block 9 can be moved laterally during the pulling process by the limitation of the sliding through hole 11. The clamping can be completed by the relative movement of the four clamping blocks 9.

[0042] A first pressure sensor 19 is provided at the upper end of one side of the rotation sensor 20, and the first pressure sensor 19 is electrically connected to the first hydraulic pump 2 and the second hydraulic pump 3. The longitudinal movement of the transmission frame 12 is detected by the first pressure sensor 19 to avoid the internal pressure causing the upper end of the transmission frame 12 to squeeze the support cylinder 8 and damage the support cylinder 8.

[0043] To better demonstrate the adjustment process of a hydraulic chuck with adjustable high and low pressure, this embodiment proposes an adjustment method for a hydraulic chuck with adjustable high and low pressure, including the following steps:

[0044] Step 1: Start the third hydraulic pump 4 and have the user manually pull the clamping block 9 to extend the clamping block 9 to its maximum position and place the clamping position between the four clamping blocks 9.

[0045] Step 2: Start the second hydraulic pump 3. The second hydraulic pump 3 draws liquid from the inside of the device base 1 and delivers it to the device base 1 through the second transmission pipe 6, and squeezes the limiting plate 18.

[0046] Step 3: After the limiting piece 18 is squeezed, the second rotating connecting shaft 15 will pull the transmission block 14. The transmission block 14 will pull the transmission frame 12 through the first rotating connecting shaft 13. The transmission frame 12 will pull the clamping block 9 at one end, so that the clamping block 9 will slide outside the sliding block 10 through the sliding through hole 11.

[0047] Step 4: The four clamping blocks 9 are pulled and moved relative to each other to complete the contact and clamping of the outer wall of the item. During the pulling process by the transmission block 14, the rotation sensor 20 detects the rotation angle of the second rotation connecting shaft 15. When the detected rotation angle is less than 45 degrees, it is considered that the item is clamped between the four clamping blocks 9.

[0048] Step 5: Rotation sensor 20 will give a start signal to the first hydraulic pump 2. The start of the first hydraulic pump 2 is the same as that of the second hydraulic pump 3. It draws the liquid inside the device base 1, and delivers the liquid through the third transmission pipe 7 to the second transmission pipe 6 and enters the support cylinder 8 together. It enters the support cylinder 8 and further pushes the limiting piece 18.

[0049] Step 6: After the clamping block 9 is fixed, rotate the rotating handle 23 to drive the transmission threaded rod 22 to rotate. The rotation of the transmission threaded rod 22 generates relative motion with the transmission ring 27. After being restricted by the longitudinal sliding rail 24, the transmission ring 27 changes from rotational motion to longitudinal linear motion.

[0050] Step 7: The longitudinal linear motion of the transmission ring 27 will drive the fixing plate 26 to adjust its longitudinal position through the longitudinal transmission rod 25. The movement of the fixing plate 26 can drive the second pressure sensor 28, so that the second pressure sensor 28 fits against the upper end of the clamping block 9.

[0051] Step 8: During the rotation of the clamping block 9, the inertia of the clamping block 9 and the clamped item itself will cause shaking. After the shaking occurs, it will be detected by the second pressure sensor 28, and the user can manually adjust the starting power of the first hydraulic pump 2 and the second hydraulic pump 3.

[0052] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0053] 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 chuck with adjustable high and low pressure, comprising a device base (1), wherein four clamping blocks (9) are evenly distributed in a ring on one side of the outer side of the device base (1), and a transmission frame (12) is provided at one end of each of the four clamping blocks (9), characterized in that... ； It also includes a transmission block (14), which is disposed on one side outside the transmission frame (12). A transmission column (16) is disposed on one side outside the transmission block (14). The transmission column (16) is rotatably connected to one end of the transmission block (14) through a second rotating connecting shaft (15). The other end of the transmission block (14) is rotatably connected to the transmission frame (12) through a first rotating connecting shaft (13). There are a total of four second rotating connecting shafts (15). One end of one of the second rotating connecting shafts (15) is provided with a rotation sensor (20), and the rotation sensor... The detection end of the device (20) is fixedly connected to the second rotating connecting shaft (15). The outside of the rotation sensor (20) is fixedly connected to the transmission column (16) by bolts. A first hydraulic pump (2) is provided on one side of the device base (1). A second hydraulic pump (3) is provided on one side between the first hydraulic pump (2) and the device base (1). A third hydraulic pump (4) is provided between the second hydraulic pump (3) and the device base (1). The lower ends of the first hydraulic pump (2), the second hydraulic pump (3) and the third hydraulic pump (4) are all connected to one side of the device base (1) by bolts. The device is fixedly connected by bolts. A support cylinder (8) is provided between the device base (1) and the clamping block (9). The clamping block (9) is located on one side outside the support cylinder (8). The transmission column (16) is located inside the support cylinder (8). The second hydraulic pump (3) is sealed to the support cylinder (8) through the second transmission pipe (6). The third hydraulic pump (4) is sealed to the support cylinder (8) through the first transmission pipe (5). The first hydraulic pump (2) is sealed to the second transmission pipe (6) through the third transmission pipe (7). One end of the transmission column (16) is provided with a... The limiting plate (18) and one end of the limiting plate (18) and the transmission column (16) are integrated. The rotation angle of the second rotating connecting shaft (15) is detected by the rotation sensor (20). The size of the clamped item is detected based on the rotation angle. Based on the size of the item, the first hydraulic pump (2) and the second hydraulic pump (3) are started simultaneously or the second hydraulic pump (3) is started alone to extract the medium stored in the device base (1) and transport the medium between the limiting plate (18) and the support cylinder (8). After the transport is completed, the limiting plate (18) is pushed and the item is clamped and fixed.

2. The hydraulic chuck with adjustable high and low pressure according to claim 1, characterized in that: One of the clamping blocks (9) is provided with a transmission frame (21) on one side. A transmission threaded rod (22) is provided inside the transmission frame (21). A rotating handle (23) is provided at one end of the transmission threaded rod (22), and the rotating handle (23) is fixedly connected to one end of the transmission threaded rod (22). The lower end of the transmission threaded rod (22) is rotatably connected to the lower end inside the transmission frame (21). A transmission ring (27) is provided on one side outside the transmission threaded rod (22), and the inside of the transmission ring (27) is threaded with the outside of the transmission threaded rod (22).

3. A hydraulic chuck with adjustable high and low pressure according to claim 2, characterized in that: A longitudinal transmission rod (25) is provided on one side of the upper end of the transmission ring (27), and a fixing plate (26) is provided on the upper end of the longitudinal transmission rod (25). The fixing plate (26), the longitudinal transmission rod (25) and the transmission ring (27) are welded and fixed in sequence.

4. A hydraulic chuck with adjustable high and low pressure according to claim 3, characterized in that: The lower end of the fixed plate (26) is provided with a second pressure sensor (28), and the upper end of the second pressure sensor (28) is fixedly connected to the lower end of the fixed plate (26) by bolts. The second pressure sensor (28) and the rotation sensor (20) are both electrically connected to the first hydraulic pump (2) and the second hydraulic pump (3).

5. A hydraulic chuck with adjustable high and low pressure according to claim 4, characterized in that: The upper end of one side of the rotation sensor (20) is provided with a first pressure sensor (19), and the first pressure sensor (19) is electrically connected to the first hydraulic pump (2) and the second hydraulic pump (3).

6. The adjustment method based on the hydraulic chuck with adjustable high and low pressure as described in claim 5, characterized in that: Includes the following steps: Step 1: Place the clamping position between the four clamping blocks (9); Step 2: The second hydraulic pump (3) draws the liquid inside the device base (1) and delivers it to the device base (1) through the second transmission pipe (6) and squeezes the limiting plate (18). Step 3: After the limiting piece (18) is squeezed, the second rotating connecting shaft (15) will pull the transmission block (14), and the transmission block (14) will pull the transmission frame (12) through the first rotating connecting shaft (13). The transmission frame (12) will pull the clamping block (9) at one end. Step 4: The four clamping blocks (9) are pulled and moved relative to each other to complete the adhesion and clamping of the outer wall of the item. The rotation sensor (20) detects the rotation angle of the second rotation connecting shaft (15). Step 5: Rotation sensor (20) will give a start signal to the first hydraulic pump (2). The start of the first hydraulic pump (2) is the same as that of the second hydraulic pump (3) to extract the liquid inside the base (1) of the extraction device. Step 6: After the clamping block (9) is fixed, rotate the rotating handle (23) to drive the transmission threaded rod (22) to rotate. The transmission ring (27) is restricted by the longitudinal sliding rail (24) and changes from rotational motion to longitudinal linear motion. Step 7: The longitudinal linear motion of the transmission ring (27) will drive the fixed plate (26) to adjust its longitudinal position through the longitudinal transmission rod (25). The movement of the fixed plate (26) can drive the second pressure sensor (28). Step 8: The inertia of the clamping block (9) and the clamped item itself will cause shaking. After the shaking occurs, it will be detected by the second pressure sensor (28), and the user can manually adjust the starting power of the first hydraulic pump (2) and the second hydraulic pump (3).

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