A force-increasing screw and clamping assembly

Abstract

The application relates to the technical field of clamping tools, and provides a force-amplifying screw rod and a clamping assembly, which comprise a shell, one end of the shell is provided with a first opening which is in communication with the inside of the shell, the outer peripheral wall of the shell is provided with a threaded structure, the threaded structure is used for being threadedly connected with an external connecting piece, so that the other end of the shell is used for exerting a clamping force on a workpiece; a cylinder body assembly comprises a cylinder body and a piston piece arranged in the cylinder body and movably connected with the cylinder body in the axial direction of the cylinder body, at least part of the cylinder body is arranged in the shell through the first opening, the shell is movably connected with the cylinder body in the axial direction of the cylinder body, and the side of the cylinder body corresponding to the other end of the shell and the inner wall of the shell jointly form a first sealed chamber, and the first sealed chamber is used for containing a first medium. Through the technical scheme of the application, the clamping force of the screw rod can be improved.

Description

Technical Field

[0001] This invention relates to the field of clamping tooling technology, and more specifically, to a force-increasing lead screw and a clamping assembly. Background Technology

[0002] Currently, when heavy-duty horizontal lathes, vertical lathes, and other equipment process large casting and forging blanks weighing 300 tons or more, the workpiece will vibrate frequently under complex working conditions. At this time, the traditional clamping screw cannot maintain a stable and sufficient clamping force under such conditions, which will cause the screw to loosen during the clamping process, reducing the machining accuracy and safety of the workpiece. Summary of the Invention

[0003] The problem solved by this invention is how to improve the clamping force of the lead screw.

[0004] To address the above problems, the present invention provides a force-boosting lead screw and a clamping assembly.

[0005] In a first aspect, the present invention provides a force-enhancing screw, comprising: a housing, one end of which has a first opening communicating with its interior, the outer peripheral wall of which has a threaded structure for threaded connection with an external component, so that the other end of the housing is used to apply a clamping force to a workpiece; a cylinder assembly, including a cylinder and a piston disposed in the cylinder and axially connected to the cylinder, at least a portion of the cylinder being disposed in the housing through the first opening, the housing being axially connected to the cylinder, and a first sealed chamber being formed between the side of the cylinder corresponding to the other end of the housing and the inner wall of the housing, the first sealed chamber being used to contain a first medium; wherein, the end of the piston away from the first opening forms a driving end, the driving end having an initial position and a driving position relatively disposed therebetween, when the driving end is in the initial position, the driving end is located in the cylinder, and when the driving end is in the driving position, the driving end passes through the cylinder and is located in the first sealed chamber, so as to drive the housing to move toward the side away from the cylinder.

[0006] The beneficial effects of the force-boosting screw and clamping assembly of this invention are: By setting a first medium in the first sealed chamber, and utilizing the compressibility and rigidity of the first medium, when the piston drive end moves from the initial position to the drive position, the drive end passes through the cylinder end and enters the first sealed chamber. At this time, it is equivalent to squeezing the first medium in the first sealed chamber, resulting in an increase in the pressure of the first medium. The high pressure of the first medium in the first sealed chamber pushes the inner wall of the housing. Since the housing and the cylinder are axially slidingly connected, the displacement of the piston drive end can be converted into the displacement of the housing by the first medium. This can drive the housing to move relative to the cylinder, thereby increasing the clamping force of the housing on the workpiece and preventing the force-enhancing screw from loosening during the clamping process. At the same time, when the workpiece vibrates and tends to displace during processing, the first medium can absorb the energy generated by the vibration, thereby playing a buffering and vibration-absorbing role and improving the stability of the force-enhancing screw during operation.

[0007] Optionally, the cylinder assembly further includes an end cap, the cylinder having a receiving cavity and a second opening and a receiving groove respectively communicating with the receiving cavity, the second opening and the first opening being located on the same side of the housing, the receiving groove being disposed near the other end of the housing, the receiving groove extending axially along the cylinder and communicating with the first sealing chamber, the end cap being sealed to the second opening, the piston being disposed in the receiving cavity through the second opening, and the drive end being sealed to the receiving groove.

[0008] Optionally, the piston assembly includes: a piston head, sealingly connected to the receiving cavity, the piston head being configured to divide the receiving cavity along the axial direction of the cylinder into a second sealing chamber and a third sealing chamber, the second sealing chamber being used to receive a second medium; and a rod, at least partially located within the third sealing chamber, the end of the rod remote from the first opening forming the drive end; wherein, when the second medium flows into the second sealing chamber, the piston head and the rod move synchronously in a direction away from the first opening, so that the drive end moves from the initial position to the drive position.

[0009] Optionally, the end cap is provided with a first liquid inlet groove communicating with the second sealing chamber, the first liquid inlet groove being configured to allow the second medium to flow into the second sealing chamber.

[0010] Optionally, the cylinder assembly further includes: an elastic element disposed in the third sealed chamber and sleeved and connected to the outer periphery of a portion of the rod, one end of the elastic element abutting against the end face of the piston head away from the first opening, the other end of the elastic element abutting against the inner wall of the cylinder, and the elastic element being configured to apply an axial force to the piston head from the receiving groove toward the second opening.

[0011] Optionally, a guide structure is provided between the housing and the cylinder, the guide structure being used to guide the movement of the housing.

[0012] Optionally, the outer peripheral wall of the cylinder is provided with a protrusion, and the inner wall of the housing is provided with a guide groove corresponding to the protrusion. The guide groove extends along the axial direction of the cylinder, and the protrusion is movably disposed in the guide groove. The protrusion and the guide groove cooperate to form the guide structure.

[0013] Optionally, the cylinder assembly further includes a retaining ring threadedly connected to the outer peripheral wall of a portion of the cylinder located outside the housing, wherein the retaining ring is configured to abut against the end face of the housing on the side near the first opening to limit the position of the housing relative to the cylinder.

[0014] Optionally, the housing is provided with a second liquid inlet groove that communicates with the first sealed chamber, and the second liquid inlet groove is configured to allow the first medium to flow into the first sealed chamber.

[0015] Secondly, the present invention provides a clamping assembly including the force-increasing screw as described above.

[0016] The clamping assembly of this embodiment has the same beneficial effects over the prior art as the force-increasing screw described above, and will not be repeated here. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the force-boosting screw provided in an embodiment of the present invention; Figure 2 for Figure 1 Schematic diagram of the cross section at point AA; Figure 3 This is a schematic diagram of the cylinder block assembly provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the shell structure provided in an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: 10. Shell 10, First opening 11 Cylinder assembly 20, cylinder 21, piston assemblies 22, piston head 221, rod 222, end cap 23, receiving cavity 24, second sealing chamber 241, third sealing chamber 242, receiving groove 26. First sealed chamber 30 First liquid inlet tank 40, Elastic component 50 Protrusion 61, guide groove 62 70 retaining rings Second liquid inlet tank 80, cylinder body axial direction X. Detailed Implementation

[0019] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0020] In the accompanying drawings, the X-axis represents the horizontal direction and is designated as left and right positions. The positive direction of the X-axis represents the left side, and the negative direction of the X-axis represents the right side. It should also be noted that the aforementioned representation of the X-axis is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0021] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0022] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0023] like Figures 1 to 4As shown, the present invention provides a force-multiplying lead screw, comprising: a housing 10, one end of which has a first opening 11 communicating with its interior, and the outer peripheral wall of the housing 10 having a threaded structure for threaded connection with an external component, so that the other end of the housing 10 is used to apply a clamping force to a workpiece; and a cylinder assembly 20, including a cylinder 21 and a piston 22 disposed within the cylinder 21 and axially movable and connected to the cylinder 21, wherein at least a portion of the cylinder 21 is disposed within the housing 10 through the first opening 11, and the housing 10 is axially movable and connected to the cylinder 21. Connected to the cylinder body 21, the cylinder body 21 and the inner wall of the housing 10 together form a first sealed chamber 30, which is used to contain the first medium; wherein, the end of the piston member 22 away from the first opening 11 forms a driving end, which has an initial position and a driving position respectively. When the driving end is in the initial position, the driving end is located inside the cylinder body 21. When the driving end is in the driving position, the driving end passes through the cylinder body 21 and is located in the first sealed chamber 30, so as to drive the housing 10 to move away from the cylinder body 21.

[0024] In this embodiment, a sealing ring is provided between the outer peripheral wall of the cylinder body 21 and the inner wall of the housing 10. The sealing ring is fitted around the outer periphery of the cylinder body 21, which can ensure the sealing degree of the first sealing chamber 30 and prevent the first medium from leaking from the first sealing chamber 30, thereby ensuring the stability of the force-boosting screw during operation.

[0025] Meanwhile, there are three sealing rings between the outer peripheral wall of the cylinder 21 and the inner wall of the housing 10. The three sealing rings are arranged sequentially along the axial direction of the cylinder 21, which maximizes the sealing of the first sealing chamber 30 to meet the usage requirements of the device.

[0026] In this embodiment, the first medium is specifically hydraulic oil. Optionally, in other embodiments of this application, the first medium may also be compressed air or the like, as long as it meets the usage requirements of the device.

[0027] In this embodiment, X is the axial direction of the cylinder 21.

[0028] The beneficial effects of the force-boosting screw and clamping assembly of this invention are: By setting a first medium in the first sealed chamber 30, and utilizing the compressibility and rigidity of the first medium, when the driving end of the piston 22 moves from the initial position to the driving position, the driving end passes through the end of the cylinder 21 and enters the first sealed chamber 30. At this time, it is equivalent to squeezing the first medium in the first sealed chamber 30, which leads to an increase in the pressure of the first medium. The high pressure of the first medium in the first sealed chamber 30 pushes the inner wall of the housing 10. Since the housing 10 and the cylinder 21 are axially slidingly connected, the displacement of the driving end of the piston 22 can be converted into the displacement of the housing 10 by the first medium. This can drive the housing 10 to move relative to the cylinder 21, thereby increasing the clamping force of the housing 10 on the workpiece and preventing the force-enhancing screw from loosening during the clamping process. At the same time, when the workpiece vibrates during the processing and has a tendency to displace, the first medium can absorb the energy generated by the vibration, thereby playing a buffering and vibration-absorbing role and improving the stability of the force-enhancing screw during operation.

[0029] like Figure 1 and Figure 2 As shown, optionally, the cylinder assembly 20 further includes an end cap 23. The cylinder 21 has a receiving cavity 24 and a second opening and a receiving groove 26 respectively connected to the receiving cavity 24. The second opening and the first opening 11 are located on the same side of the housing 10. The receiving groove 26 is disposed near the other end of the housing 10. The receiving groove 26 extends axially along the cylinder 21 and is connected to the first sealing chamber 30. The end cap 23 is sealed to the second opening. The piston 22 is disposed in the receiving cavity 24 through the second opening, and the drive end is sealed to the receiving groove 26.

[0030] By setting up the above structure, the end cap 23 is sealed to the second opening, effectively preventing leakage of the medium inside the receiving cavity 24. This arrangement ensures the stability of the internal pressure of the receiving cavity 24, ensuring that the piston 22 can move stably within the receiving cavity 24, and avoiding pressure changes caused by leakage of the medium inside the receiving cavity 24, thereby affecting the performance of the entire system. At the same time, the sealed connection between the drive end and the receiving groove 26 further improves the sealing performance of the cylinder assembly 20, preventing the flow of the first medium between the receiving groove 26 and the first sealed chamber 30, which helps to ensure the stability of the pressure in each chamber.

[0031] like Figure 1 and Figure 2As shown, the piston component 22 includes: a piston head 221, which is sealed to the receiving cavity 24, the piston head 221 being configured to divide the receiving cavity 24 along the axial direction of the cylinder body 21 into a second sealing chamber 241 and a third sealing chamber 242, the second sealing chamber 241 being used to receive a second medium; a rod 222, which is at least partially located in the third sealing chamber 242, the end of the rod 222 away from the first opening 11 forming a drive end; wherein, when the second medium flows into the second sealing chamber 241, the piston head 221 and the rod 222 move synchronously in a direction away from the first opening 11, so that the drive end moves from the initial position to the drive position.

[0032] By setting the above structure, the leakage of the second medium from the second sealed chamber 241 to the third sealed chamber 242 is effectively prevented, thereby ensuring the stability of the pressure in each chamber. At the same time, by controlling the inflow and outflow of the second medium in the second sealed chamber 241, the pressure in the second sealed chamber 241 can be precisely adjusted, thereby achieving precise control of the movement of the piston head 221, thus ensuring the stability of the clamping force.

[0033] In this embodiment, a sealing ring is provided between the outer peripheral wall of the piston head 221 and the inner wall of the cylinder 21. The sealing ring is fitted around the outer periphery of the piston head 221, which can ensure the sealing of the second sealing chamber 241 and prevent the second medium from leaking from the second sealing chamber 241, thereby ensuring the stability of the force-boosting screw during operation.

[0034] Meanwhile, there are three sealing rings between the outer peripheral wall of the piston head 221 and the inner wall of the cylinder 21. The three sealing rings are arranged sequentially along the axial direction of the piston head 221, which maximizes the sealing of the second sealing chamber 241 to meet the usage requirements of the device.

[0035] In this embodiment, the second medium is specifically hydraulic oil. Optionally, in other embodiments of this application, the second medium may also be compressed air or the like, as long as it meets the usage requirements of the device.

[0036] like Figure 2 As shown, the end cap 23 is provided with a first liquid inlet groove 40 that communicates with the second sealing chamber 241. The first liquid inlet groove 40 is configured to allow the second medium to flow into the second sealing chamber 241.

[0037] By setting the above structure, the second medium can directly enter the second sealed chamber 241 through the first liquid inlet 40 without the need for additional pipeline structure designed on the cylinder body 21. This simplifies the overall structure of the force-boosting screw, thereby helping to reduce the manufacturing difficulty and cost of the force-boosting screw.

[0038] Meanwhile, during the installation process of this embodiment, it is only necessary to connect the external medium delivery pipeline to the first liquid inlet 40 on the end cap 23 to deliver the second medium to the second sealed chamber 241, making the installation more convenient and quick, and helping to reduce installation time and labor costs.

[0039] like Figure 2 As shown, the cylinder assembly 20 further includes an elastic member 50, which is disposed in the third sealed chamber 242 and sleeved and connected to the outer periphery of a portion of the rod 222. One end of the elastic member 50 abuts against the end face of the piston head 221 away from the first opening 11, and the other end of the elastic member 50 abuts against the inner wall of the cylinder 21. The elastic member 50 is configured to apply an axial force to the piston head 221 from the receiving groove 26 toward the second opening.

[0040] By configuring the above structure, when the second medium no longer flows into the second sealed chamber 241 or the pressure of the second medium decreases, the elastic element 50 applies an axial force to the piston head 221 from the receiving groove 26 toward the second opening. This axial force pushes the piston head 221 and the rod 222 toward the initial position, thus allowing the piston 22 to return to its initial position without the need for an additional drive device. This simplifies the control process of the force-amplifying screw and improves its working efficiency. Furthermore, the elastic element 50 is located in the third sealed chamber 242 and is sleeved and connected to part of the rod 222. This makes reasonable use of the space inside the cylinder 21, without increasing the overall size of the force-amplifying screw. This makes the structure of the force-amplifying screw more compact, facilitating installation and use in limited spaces and contributing to the miniaturization of the force-amplifying screw.

[0041] In this embodiment, the elastic element 50 is specifically a spring. The above structure is simple and easy to process, which can not only reduce the production cost of the component, but also improve the production efficiency of the component.

[0042] In this embodiment, when the housing 10 needs to be moved, a second medium flows into the second sealed chamber 241. As the second medium flows in continuously, the pressure in the second sealed chamber 241 gradually increases. This pressure generates a thrust on the piston head 221 in a direction away from the first opening 11. Under the action of the pressure thrust in the second sealed chamber 241, the piston head 221 and the rod 222 move synchronously in a direction away from the first opening 11, and the drive end on the rod 222 gradually extends out from the cylinder 21. At this time, the elastic element 50 is further compressed to store elastic potential energy. The reverse force exerted by the elastic element 50 on the piston head 221 gradually increases. However, the thrust generated by the pressure of the second medium in the initial stage is greater than the reverse force of the elastic element 50. Therefore, the piston 22 can continue to move away from the first opening 11. When the driving end moves to the driving position, that is, when the driving end passes through the cylinder 21 and is located in the first sealed chamber 30, the driving end contacts the first medium in the first sealed chamber 30. The first medium generates a reaction force on the driving end and transmits it to the housing 10 through the mechanical action between the driving end and the housing 10, pushing the housing 10 to move away from the first opening 11 relative to the cylinder 21. The other end of the housing 10 applies a clamping force to the workpiece, thereby realizing the function of improving the clamping force. When it is necessary to reduce the clamping force, the input of the second medium into the second sealed chamber 241 is stopped. This will cause the pressure in the second sealed chamber 241 to decrease. At this time, the elastic potential energy stored in the elastic element 50 is released, and the reverse force applied to the piston head 221 is greater than the thrust generated by the remaining pressure in the second sealed chamber 241. This will push the piston head 221 and the rod 222 to move toward the initial position. As the driving end of the piston element 22 retracts, the driving effect on the housing 10 disappears, the pressure in the first sealed chamber 30 gradually decreases, and the housing 10 moves relative to the cylinder 21 toward the side closer to the first opening 11, returning to the initial state.

[0043] Optionally, a guide structure is provided between the housing 10 and the cylinder 21, the guide structure being used to guide the movement of the housing 10.

[0044] By setting the above structure, the guide structure can ensure that the housing 10 always moves in a straight line along the axis of the cylinder 21 during the movement, avoiding deviation, shaking or tilting, thus ensuring the stability of the housing 10 when it moves.

[0045] like Figure 3 and Figure 4 As shown, a protrusion 61 is provided on the outer peripheral wall of the cylinder body 21, and a guide groove 62 corresponding to the protrusion 61 is provided on the inner wall of the housing 10. The guide groove 62 extends along the axial direction of the cylinder body 21, and the protrusion 61 is movably disposed in the guide groove 62. The protrusion 61 and the guide groove 62 cooperate to form a guide structure.

[0046] By setting the above structure, the protrusion 61 moves axially along the cylinder 21 within the guide groove 62, which effectively prevents the housing 10 from shifting, shaking, or tilting during movement. This ensures that each movement of the housing 10 is axial, which helps to ensure the accuracy of clamping and thus improves the processing quality of the workpiece.

[0047] In this embodiment, the protrusion 61 has a waist-shaped structure. The structure is simple and easy to process, which can not only reduce the production cost of the component, but also improve the production efficiency of the component.

[0048] Optionally, the cylinder assembly 20 further includes a retaining ring 70, which is threadedly connected to the outer peripheral wall of a portion of the cylinder 21 located outside the housing 10. The side of the retaining ring 70 near the first opening 11 is configured to abut against the end face of the housing 10 to limit the position of the housing 10 relative to the cylinder 21.

[0049] By setting the above structure, the retaining ring 70 is fixed to the cylinder body 21 by a threaded connection. By utilizing the contact between the retaining ring 70 and the end face of the housing 10, the position of the housing 10 relative to the cylinder body 21 can be precisely limited. During the assembly process of the force-increasing screw, the position of the retaining ring 70 on the cylinder body 21 can be adjusted according to actual needs, thereby accurately setting the initial position and stroke range of the housing 10, ensuring that the housing 10 is always in the preset position during the movement, which is beneficial to the working accuracy and reliability of the force-increasing screw.

[0050] In this embodiment, the inner wall of the fixing ring 70 is provided with an internal thread structure, and the outer peripheral wall of the part of the cylinder 21 located outside the housing 10 is provided with an external thread structure. The above structure is simple and easy to process, which can not only reduce the production cost of the component, but also improve the production efficiency of the component.

[0051] like Figure 2 As shown, the housing 10 is provided with a second liquid inlet groove 80 that communicates with the first sealed chamber 30. The second liquid inlet groove 80 is configured to allow the first medium to flow into the first sealed chamber 30.

[0052] By setting the above structure, the first medium can directly enter the first sealed chamber 30 through the second liquid inlet 80 without the need for additional pipeline structure designed on the housing 10. This simplifies the overall structure of the force-boosting screw, thereby helping to reduce the manufacturing difficulty and cost of the force-boosting screw.

[0053] The present invention provides a clamping assembly, including the force-increasing screw as described above.

[0054] The clamping assembly of this embodiment has the same beneficial effects over the prior art as the force-increasing screw described above, and will not be repeated here.

[0055] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A force-multiplying lead screw, characterized in that, include: The housing (10) has a first opening (11) at one end that communicates with its interior, and a threaded structure on the outer peripheral wall of the housing (10). The threaded structure is used to connect with an external component, so that the other end of the housing (10) can be used to apply a clamping force to the workpiece. The cylinder assembly (20) includes a cylinder (21) and a piston (22) disposed within the cylinder (21) and movably connected to the cylinder (21) along the axial direction of the cylinder (21). At least a portion of the cylinder (21) is disposed within the housing (10) through the first opening (11). The housing (10) is movably connected to the cylinder (21) along the axial direction of the cylinder (21). A first sealed chamber (30) is formed between the side of the cylinder (21) corresponding to the other end of the housing (10) and the inner wall of the housing (10). The first sealed chamber (30) is used to contain a first medium. Wherein, the piston (22) has a drive end at the end away from the first opening (11). The drive end has an initial position and a drive position that are set opposite to each other. When the drive end is in the initial position, the drive end is located inside the cylinder (21). When the drive end is in the drive position, the drive end passes through the cylinder (21) and is located inside the first sealed chamber (30) to drive the housing (10) to move toward the side away from the cylinder (21). The cylinder assembly (20) further includes an end cap (23). The cylinder (21) has a receiving cavity (24) and a second opening and a receiving groove (26) respectively connected to the receiving cavity (24). The second opening and the first opening (11) are located on the same side of the housing (10). The receiving groove (26) is disposed near the other end of the housing (10). The receiving groove (26) extends along the axial direction of the cylinder (21) and is connected to the first sealing chamber (30). The end cap (23) is sealed to the second opening. The piston (22) is disposed in the receiving cavity (24) through the second opening, and the drive end is sealed to the receiving groove (26). The piston component (22) includes: A piston head (221) is sealed to the receiving cavity (24), the piston head (221) being configured to divide the receiving cavity (24) along the axial direction of the cylinder body (21) into a second sealing chamber (241) and a third sealing chamber (242), the second sealing chamber (241) being used to receive a second medium; The rod (222) is at least partially located within the third sealed chamber (242), and the end of the rod (222) away from the first opening (11) forms the drive end; When the second medium flows into the second sealed chamber (241), the piston head (221) and the rod (222) move synchronously away from the first opening (11) so that the driving end moves from the initial position to the driving position.

2. The force-boosting screw according to claim 1, characterized in that, The end cap (23) is provided with a first liquid inlet groove (40) that communicates with the second sealing chamber (241). The first liquid inlet groove (40) is configured to allow the second medium to flow into the second sealing chamber (241).

3. The force-boosting screw according to claim 1, characterized in that, The cylinder block assembly (20) also includes: An elastic element (50) is disposed in the third sealed chamber (242) and sleeved and connected to the outer periphery of a portion of the rod (222). One end of the elastic element (50) abuts against the end face of the piston head (221) away from the first opening (11), and the other end of the elastic element (50) abuts against the inner wall of the cylinder (21). The elastic element (50) is configured to apply an axial force to the piston head (221) from the receiving groove (26) toward the second opening.

4. The force-increasing screw according to any one of claims 1 to 3, characterized in that, A guide structure is provided between the housing (10) and the cylinder (21), the guide structure being used to guide the movement of the housing (10).

5. The force-boosting screw according to claim 4, characterized in that, The cylinder body (21) has a protrusion (61) on its outer peripheral wall, and the housing (10) has a guide groove (62) corresponding to the protrusion (61) on its inner wall. The guide groove (62) extends along the axial direction of the cylinder body (21), and the protrusion (61) is movably disposed in the guide groove (62). The protrusion (61) and the guide groove (62) cooperate to form the guide structure.

6. The force-increasing screw according to any one of claims 1 to 3, characterized in that, The cylinder block assembly (20) also includes: A retaining ring (70) is threaded to the outer peripheral wall of a portion of the cylinder (21) located outside the housing (10). The side of the retaining ring (70) near the first opening (11) is configured to abut against the end face of the housing (10) to limit the position of the housing (10) relative to the cylinder (21).

7. The force-increasing screw according to any one of claims 1 to 3, characterized in that, The housing (10) is provided with a second liquid inlet groove (80) that communicates with the first sealed chamber (30). The second liquid inlet groove (80) is configured to allow the first medium to flow into the first sealed chamber (30).

8. A clamping assembly, characterized in that, Including the force-boosting screw as described in any one of claims 1 to 7.

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