Reinforcing lead screw and clamping assembly

Abstract

The invention relates to the technical field of clamping tools, and provides a reinforcement lead screw and a clamping assembly.The reinforcement lead screw comprises a shell, one end of the shell is provided with a first opening communicating with the interior of the shell, the peripheral wall of the shell is provided with a threaded structure, and the threaded structure is used for being in threaded connection with an external connecting piece so that the other end of the shell can apply clamping acting force to a workpiece; the cylinder body assembly comprises a cylinder body and a piston piece which is arranged in the cylinder body and movably connected to 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 to the cylinder body in the axial direction of the cylinder body, and a first sealing cavity is jointly formed between the side, corresponding to the other end of the shell, of the cylinder body and the inner wall of the shell; the first sealing cavity is used for containing a first medium. According to the technical scheme, the clamping force of the lead screw can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of clamping tooling, and in particular to a force-boosting lead screw and a clamping assembly. Background Art

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

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

[0004] In order to solve the above problems, the present invention provides a force-amplifying screw and a clamping assembly.

[0005] In a first aspect, the present invention provides a force-amplifying screw, comprising: a housing, one end of the housing being provided with a first opening communicating with its interior, an outer peripheral wall of the housing being provided with a threaded structure, the threaded structure being used to be threadedly connected to an external member so that the other end of the housing is used to apply a clamping force to a workpiece; a cylinder assembly, comprising a cylinder and a piston member disposed in the cylinder body and connected to the cylinder body for axial movement along the cylinder body, at least a portion of the cylinder body being disposed in the housing through the first opening, the housing being connected to the cylinder body for axial movement along the cylinder body, a first sealed chamber being formed between a side of the cylinder body corresponding to the other end of the housing and an inner wall of the housing, the first sealed chamber being used to accommodate a first medium; wherein an end of the piston member away from the first opening forms a driving end, the driving end having an initial position and a driving position which are relatively set, and when the driving end is in the initial position, the driving end is located in the cylinder body, and when the driving end is in the driving position, the driving end passes through the cylinder body and is located in the first sealed chamber to drive the housing to move toward a side away from the cylinder body.

[0006] The beneficial effects of the force-boosting screw and the clamping assembly of the present invention are: By arranging the first medium in the first sealed chamber and utilizing the compressibility and rigidity of the first medium, when the driving end of the piston moves from the initial position to the driving position, the driving end passes through the end of the cylinder body 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 first medium in the first sealed chamber is used to push the inner wall of the shell. Since the shell and the cylinder body are axially slidingly connected, the first medium can be used to convert the displacement of the driving end of the piston into the displacement of the shell, which can drive the shell to move relative to the cylinder body to increase the clamping force of the shell on the workpiece, thereby avoiding the loosening of the force-boosting screw during the clamping process; at the same time, when the workpiece vibrates and produces a displacement tendency during the processing, the first medium can absorb the energy generated by the vibration, thereby playing a role in buffering and absorbing vibrations, and improving the stability of the force-boosting screw during operation.

[0007] Optionally, the cylinder assembly further includes an end cover, the cylinder having a accommodating cavity and a second opening and an accommodating groove respectively connected to the accommodating cavity, the second opening and the first opening being located on the same side of the shell, the accommodating groove being arranged near the other end of the shell, the accommodating groove extending along the axial direction of the cylinder body and being connected to the first sealed chamber, the end cover being sealed and connected to the second opening, the piston being arranged in the accommodating cavity through the second opening, and the driving end being sealed and connected to the accommodating groove.

[0008] Optionally, the piston member includes: a piston head, sealed and connected to the accommodating chamber, the piston head being configured to separate the accommodating chamber into a second sealed chamber and a third sealed chamber along the axial direction of the cylinder body, the second sealed chamber being used to accommodate a second medium; a rod body, at least partially located in the third sealed chamber, the end of the rod body away from the first opening forming the driving end; wherein, when the second medium flows into the second sealed chamber, the piston head and the rod body move synchronously in a direction away from the first opening, so that the driving end moves from the initial position to the driving position.

[0009] Optionally, the end cover is provided with a first liquid inlet groove communicated with the second sealed chamber, and the first liquid inlet groove is configured to allow the second medium to flow into the second sealed chamber.

[0010] Optionally, the cylinder assembly further includes: an elastic member disposed in the third sealing chamber and connected to a portion of the outer periphery of the rod body, one end of the elastic member abuts against the end face of the piston head away from the first opening, and the other end of the elastic member abuts against the inner wall of the cylinder body, and the elastic member is configured to apply an axial force from the accommodating groove toward the second opening to the piston head.

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

[0012] Optionally, a protrusion is provided on the outer peripheral wall of the cylinder body, and a guide groove corresponding to the protrusion is provided on the inner wall of the shell, the guide groove extends along the axial direction of the cylinder body, the protrusion is movably provided in the guide groove, and the protrusion cooperates with the guide groove to form the guide structure.

[0013] Optionally, the cylinder assembly further includes: a fixing ring threadedly connected to the outer peripheral wall of the portion of the cylinder located outside the shell, and the side of the fixing ring close to the first opening is configured to abut against the end face of the shell to limit the position of the shell relative to the cylinder.

[0014] Optionally, the housing is provided with a second liquid inlet groove communicated 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] In a second aspect, the present invention provides a clamping assembly comprising a force-amplifying screw as described above.

[0016] The beneficial effects of the clamping assembly of this embodiment relative to the prior art are the same as those of the above-mentioned force-amplifying screw, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of a force-amplifying screw provided in an embodiment of the present invention; Figure 2 for Figure 1 Schematic diagram of the cross section at AA in the middle; Figure 3 A schematic structural diagram of a cylinder assembly provided in an embodiment of the present invention; Figure 4 A schematic structural diagram of a housing provided in an embodiment of the present invention.

[0018] Description of reference numerals: Housing 10, first opening 11, Cylinder assembly 20, cylinder 21, piston 22, piston head 221, rod 222, end cover 23, accommodating chamber 24, second sealed chamber 241, third sealed chamber 242, accommodating groove 26, The first sealed chamber 30, First liquid inlet tank 40, Elastic member 50, The protrusion 61, the guide groove 62, Fixed ring 70, The second liquid inlet groove 80 and the axial direction X of the cylinder body. DETAILED DESCRIPTION

[0019] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the 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] The X-axis in the accompanying drawings represents the horizontal direction and is designated as left and right. 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 be noted that the aforementioned X-axis designation is intended solely to facilitate and simplify the description of the present invention and is not intended to indicate or imply that the device or component referred to must have, be constructed, or operate in a specific orientation. Therefore, it should not be construed as limiting the present invention.

[0021] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0022] It should be noted that the modifications of "one" and "multiple" mentioned in the present invention are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0023] like Figures 1 to 4As shown, the present invention provides a force-enhancing screw, comprising: a housing 10, one end of the housing 10 is provided with a first opening 11 connected to the interior thereof, the outer peripheral wall of the housing 10 is provided with a threaded structure, the threaded structure is used to be threadedly connected to an external member, so that the other end of the housing 10 is used to apply a clamping force to a workpiece; a cylinder assembly 20, comprising a cylinder 21 and a piston member 22 arranged in the cylinder 21 and connected to the cylinder 21 along the axial movement of the cylinder 21, at least a portion of the cylinder 21 is arranged in the housing 10 through the first opening 11, and the housing 10 is connected to the cylinder 21 along the axial movement of the cylinder 21 It is connected to the cylinder body 21, and a first sealed chamber 30 is formed between the side of the cylinder body 21 corresponding to the other end of the shell 10 and the inner wall of the shell 10. The first sealed chamber 30 is used to accommodate the first medium; wherein, the end of the piston member 22 away from the first opening 11 forms a driving end, and the driving end has a relatively set initial position and a driving position. When the driving end is at the initial position, the driving end is located in the cylinder body 21. When the driving end is at the driving position, the driving end passes through the cylinder body 21 and is located in the first sealed chamber 30 to drive the shell 10 to move toward the side away from the cylinder body 21.

[0024] In this embodiment, a sealing ring is provided between the outer wall of the cylinder body 21 and the inner wall of the housing 10, and the sealing ring is sleeved on the outer periphery of the cylinder body 21, so as to ensure the sealing degree of the first sealed chamber 30 to prevent the first medium from leaking from the first sealed chamber 30, thereby ensuring the stability of the booster screw during operation.

[0025] At the same time, there are three sealing rings between the outer wall of the cylinder body 21 and the inner wall of the shell 10, and the three sealing rings are arranged in sequence along the axial direction of the cylinder body 21, so as to improve the sealing degree of the first sealed chamber 30 as much as possible to meet the use requirements of the device.

[0026] In this embodiment, the first medium is specifically hydraulic oil. Optionally, in other embodiments of the present application, the first medium can also be set to compressed air, etc., as long as it can meet the use 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 the clamping assembly of the present invention are: By arranging the 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 member 22 moves from the initial position to the driving position, the driving end passes through the end of the cylinder body 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, resulting in an increase in the pressure of the first medium. The high-pressure first medium in the first sealed chamber 30 is used to push the inner wall of the shell 10. Since the shell 10 and the cylinder body 21 are axially slidingly connected, the first medium can be used to convert the displacement of the driving end of the piston member 22 into the displacement of the shell 10, which can drive the shell 10 to move relative to the cylinder body 21, so as to increase the clamping force of the shell 10 on the workpiece, thereby preventing the force-boosting screw from loosening during the clamping process; at the same time, when the workpiece vibrates and produces a displacement tendency during the processing, the first medium can absorb the energy generated by the vibration, thereby playing a role in buffering and absorbing vibrations, thereby improving the stability of the force-boosting screw during operation.

[0029] like Figure 1 and Figure 2 As shown, optionally, the cylinder assembly 20 further includes an end cover 23, the cylinder 21 has an accommodating chamber 24 and a second opening and an accommodating groove 26 respectively connected to the accommodating chamber 24, the second opening and the first opening 11 are located on the same side of the shell 10, the accommodating groove 26 is arranged near the other end of the shell 10, the accommodating groove 26 extends along the axial direction of the cylinder 21 and is connected to the first sealed chamber 30, the end cover 23 is sealed connected to the second opening, the piston member 22 is arranged in the accommodating chamber 24 through the second opening, and the driving end is sealed connected to the accommodating groove 26.

[0030] By providing the above-described structure, the end cap 23 is sealedly connected to the second opening, effectively preventing leakage of the medium within the accommodating chamber 24. This arrangement ensures the stability of the internal pressure of the accommodating chamber 24, ensuring that the piston member 22 can move stably within the accommodating chamber 24, and avoiding pressure fluctuations caused by leakage of the medium within the accommodating chamber 24, which could affect the performance of the entire system. At the same time, the sealed connection between the drive end and the accommodating groove 26 further improves the sealing performance of the cylinder assembly 20, preventing the first medium from flowing between the accommodating groove 26 and the first sealed chamber 30, thereby ensuring the stability of the pressure in each chamber.

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

[0032] By setting up the above structure, the second medium is effectively prevented from leaking from the second sealed chamber 241 to the third sealed chamber 242, 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 of the second sealed chamber 241 can be accurately adjusted, thereby achieving precise control of the movement of the piston head 221, thereby 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 body 21, and the sealing ring is sleeved on the outer periphery of the piston head 221, so as to ensure the sealing degree of the second sealed chamber 241 to prevent the second medium from leaking from the second sealed chamber 241, thereby ensuring the stability of the booster screw during operation.

[0034] At the same time, there are three sealing rings between the outer wall of the piston head 221 and the inner wall of the cylinder body 21, and the three sealing rings are arranged in sequence along the axial direction of the piston head 221, so as to improve the sealing degree of the second sealing chamber 241 as much as possible to meet the use requirements of the device.

[0035] In this embodiment, the second medium is specifically hydraulic oil. Optionally, in other embodiments of the present application, the second medium can also be set to compressed air, etc., as long as it can meet the use requirements of the device.

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

[0037] By setting the above structure, the second medium can directly enter the second sealed chamber 241 through the first liquid inlet groove 40 without the need for an additional pipeline structure designed on the cylinder body 21. This simplifies the overall structure of the booster screw, which is conducive to reducing the manufacturing difficulty and cost of the booster screw.

[0038] At the same time, during the installation process of this embodiment, it is only necessary to connect the external medium delivery pipeline to the first liquid inlet groove 40 on the end cover 23 to realize the delivery of the second medium to the second sealed chamber 241. The installation is more convenient and quick, which is conducive to reducing installation time and labor costs.

[0039] like Figure 2 As shown, the cylinder assembly 20 also includes: an elastic member 50, which is arranged in the third sealed chamber 242 and is connected to the outer periphery of a portion of the rod body 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 body 21, and the elastic member 50 is configured to apply an axial force from the accommodating groove 26 toward the second opening to the piston head 221.

[0040] By providing 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 member 50 applies an axial force from the receiving groove 26 toward the second opening to the piston head 221. This axial force pushes the piston head 221 and the rod body 222 toward the initial position, thereby enabling the piston member 22 to return to the initial position without the need for an additional drive device, thereby simplifying the control process of the booster screw and improving the working efficiency of the booster screw. In addition, the elastic member 50 is disposed in the third sealed chamber 242 and is connected to a portion of the rod body 222. This rationally utilizes the space within the cylinder body 21 without increasing the overall size of the booster screw. This makes the booster screw more compact, convenient for installation and use in limited space, and conducive to miniaturization of the booster screw.

[0041] In this embodiment, the elastic member 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 drive housing 10 needs to move, the second medium flows into the second sealed chamber 241. As the second medium continues to flow in, the pressure in the second sealed chamber 241 gradually increases. This pressure generates a thrust on the piston head 221 in the 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 body 222 move synchronously in the direction away from the first opening 11, and the driving end on the rod body 222 gradually extends from the cylinder body 21. At this time, the elastic member 50 is further compressed, storing elastic potential energy, and the reverse force exerted by the elastic member 50 on the piston head 221 gradually increases. However, in the initial stage, the thrust generated by the second medium pressure is greater than the reverse force of the elastic member 50, so the piston member 22 can still continue to move in the direction away from the first opening 11. When the driving end moves to the driving position, that is, the driving end passes through the cylinder body 21 and is located in the first sealed chamber 30, the driving end contacts the first medium in the first sealed chamber 30, and the first medium generates a reaction force on the driving end, which is transmitted to the housing 10 through the mechanical action between the driving end and the housing 10, pushing the housing 10 to move relative to the cylinder body 21 toward the side away from the first opening 11. The other end of the housing 10 exerts a clamping force on the workpiece, thereby achieving the function of increasing the clamping force. When the clamping force needs to be reduced, the input of the second medium into the second sealed chamber 241 is stopped, which will cause the pressure in the second sealed chamber 241 to decrease. At this time, the elastic potential energy stored in the elastic member 50 is released, and the reverse force applied to the piston head 221 is greater than the thrust generated by the residual pressure in the second sealed chamber 241, thereby pushing the piston head 221 and the rod body 222 toward the initial position. As the driving end of the piston member 22 retracts, the driving effect on the shell 10 disappears, the pressure in the first sealed chamber 30 gradually decreases, and the shell 10 moves relative to the cylinder body 21 toward the side close to the first opening 11 and returns to its initial state.

[0043] Optionally, a guide structure is provided between the housing 10 and the cylinder body 21 , and the guide structure is 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 linearly along the axial direction of the cylinder 21 during movement, avoiding deviation, shaking or tilting, thereby ensuring the stability of the housing 10 during movement.

[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 shell 10. The guide groove 62 extends along the axial direction of the cylinder body 21, and the protrusion 61 is movably provided in the guide groove 62. The protrusion 61 cooperates with the guide groove 62 to form a guiding structure.

[0046] By setting the above structure, the protrusion 61 moves axially along the cylinder body 21 in the guide groove 62, which effectively prevents the shell 10 from deflecting, shaking or tilting during the movement, thereby ensuring that each movement of the shell 10 is carried out in the axial direction, which is beneficial to ensure the accuracy of clamping and thus improve the processing quality of the workpiece.

[0047] In this embodiment, the protrusion 61 is 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 fixing ring 70, which is threadedly connected to the outer peripheral wall of the portion of the cylinder 21 located outside the shell 10, and the side of the fixing ring 70 close to the first opening 11 is configured to abut against the end face of the shell 10 to limit the position of the shell 10 relative to the cylinder 21.

[0049] By setting the above structure, the fixing ring 70 is fixed to the cylinder body 21 through a threaded connection, and the abutment between the fixing ring 70 and the end face of the shell 10 can be used to accurately limit the position of the shell 10 relative to the cylinder body 21. During the assembly of the booster screw, the position of the fixing ring 70 on the cylinder body 21 can be adjusted according to actual needs, so as to accurately set the initial position and stroke range of the shell 10, ensuring that the shell 10 is always in the preset position during the movement, which is beneficial to the working accuracy and reliability of the booster screw.

[0050] In this embodiment, an internal thread structure is provided on the inner wall of the fixing ring 70, and an external thread structure is provided on the outer peripheral wall of the cylinder body 21 located outside the shell 10. The above structure is simple and easy to process, which not only reduces the production cost of the components, but also improves the production efficiency of the components.

[0051] like Figure 2 As shown, the housing 10 is provided with a second liquid inlet groove 80 communicating with the first sealed chamber 30 , and 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 groove 80 without the need for an additional pipeline structure designed on the shell 10. This simplifies the overall structure of the booster screw, which is conducive to reducing the manufacturing difficulty and cost of the booster screw.

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

[0054] The beneficial effects of the clamping assembly of this embodiment relative to the prior art are the same as those of the above-mentioned force-amplifying screw, and will not be repeated here.

[0055] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A force-enhancing screw, characterized in that: include: A housing (10), wherein one end of the housing (10) is provided with a first opening (11) communicating with the interior thereof, and an outer peripheral wall of the housing (10) is provided with a threaded structure, wherein the threaded structure is used for threaded connection with an external component, so that the other end of the housing (10) is used for applying a clamping force to a workpiece; A cylinder assembly (20) comprises a cylinder (21) and a piston member (22) disposed in the cylinder (21) and connected to the cylinder (21) in an axially movable manner along the cylinder (21); at least a portion of the cylinder (21) is disposed in the housing (10) through the first opening (11); the housing (10) is connected to the cylinder (21) in an axially movable manner along the cylinder (21); a first sealed chamber (30) is formed between one side of the cylinder (21) corresponding to the other end of the housing (10) and an inner wall of the housing (10); the first sealed chamber (30) is used to accommodate a first medium; The end of the piston member (22) away from the first opening (11) forms a driving end, and the driving end has an initial position and a driving position that are relatively set. When the driving end is at the initial position, the driving end is located in the cylinder body (21); when the driving end is at the driving position, the driving end passes through the cylinder body (21) and is located in the first sealed chamber (30) to drive the housing (10) to move toward the side away from the cylinder body (21).

2. The force-boosting screw according to claim 1, characterized in that: The cylinder assembly (20) further includes an end cover (23), the cylinder (21) having a receiving chamber (24) and a second opening and a receiving groove (26) respectively connected to the receiving chamber (24), the second opening and the first opening (11) being located on the same side of the housing (10), the receiving groove (26) being arranged near the other end of the housing (10), the receiving groove (26) extending along the axial direction of the cylinder (21) and being connected to the first sealed chamber (30), the end cover (23) being sealedly connected to the second opening, the piston member (22) being arranged in the receiving chamber (24) through the second opening, and the driving end being sealedly connected to the receiving groove (26).

3. The force-boosting screw according to claim 2, characterized in that: The piston member (22) comprises: a piston head (221) sealedly connected to the accommodating chamber (24), the piston head (221) being configured to separate the accommodating chamber (24) into a second sealed chamber (241) and a third sealed chamber (242) along the axial direction of the cylinder body (21), the second sealed chamber (241) being used to accommodate a second medium; a rod body (222), at least partially located in the third sealed chamber (242), and an end of the rod body (222) away from the first opening (11) forms the driving end; When the second medium flows into the second sealed chamber (241), the piston head (221) and the rod body (222) move synchronously in a direction away from the first opening (11), so that the driving end moves from the initial position to the driving position.

4. The force-boosting screw according to claim 3, characterized in that: The end cover (23) is provided with a first liquid inlet groove (40) in communication with the second sealed chamber (241), and the first liquid inlet groove (40) is configured to allow the second medium to flow into the second sealed chamber (241).

5. The force-boosting screw according to claim 3, characterized in that: The cylinder assembly (20) further comprises: An elastic member (50) is disposed in the third sealed chamber (242) and is sleeved and connected to a portion of the outer periphery of the rod body (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 body (21). The elastic member (50) is configured to apply an axial force from the accommodating groove (26) toward the second opening to the piston head (221).

6. The force-boosting screw according to any one of claims 1 to 5, characterized in that: A guide structure is provided between the housing (10) and the cylinder (21), and the guide structure is used to guide the movement of the housing (10).

7. The force-boosting screw according to claim 6, characterized in that: 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 provided in the guide groove (62). The protrusion (61) cooperates with the guide groove (62) to form the guide structure.

8. The force-boosting screw according to any one of claims 1 to 5, characterized in that: The cylinder assembly (20) further comprises: A fixing ring (70) is threadedly connected to the outer peripheral wall of the cylinder body (21) located outside the shell (10), and the side of the fixing ring (70) close to the first opening (11) is configured to abut against the end face of the shell (10) to limit the position of the shell (10) relative to the cylinder body (21).

9. The force-boosting screw according to any one of claims 1 to 5, characterized in that: The housing (10) is provided with a second liquid inlet groove (80) in communication with the first sealed chamber (30), and the second liquid inlet groove (80) is configured to allow the first medium to flow into the first sealed chamber (30).

10. A clamping assembly, characterized in that: Comprising a force-amplifying screw as described in any one of claims 1 to 9.

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