compacting device

Abstract

The application relates to a pressing device, comprising: a driving assembly comprising a piston rod; a transmission assembly comprising a connecting rod and a rotating piece, a first end of the connecting rod being connected with the piston rod, a second end of the connecting rod being connected with the rotating piece, the piston rod being capable of moving between a first position and a second position to drive the rotating piece to rotate through the connecting rod; a pressing arm being connected with the rotating piece, the rotating piece being capable of driving the pressing arm to rotate; and the connecting rod being arranged perpendicularly to the piston rod when the piston rod is located at the first position. The pressing device provided by the application transmits the driving force generated by the driving assembly to the pressing arm through the transmission assembly, so that the pressing arm presses a workpiece. The pressing device can provide high torque output without replacing a strong driving assembly, and the application range of the pressing device is expanded.

Description

Technical Field

[0001] This application relates to the field of welding tooling technology, and in particular to a clamping device. Background Technology

[0002] With the development of the times and the progress of technology, the tooling field is showing a trend of small-batch and diversified production. Clamping devices are needed in the process of processing and manufacturing workpieces.

[0003] A typical clamping device (such as a clamping cylinder) includes a drive assembly, a transmission assembly, and a clamping arm. The power assembly (such as a high-power cylinder) generates the driving force. The transmission assembly typically employs a multi-link structure (such as a four-stage linkage) to transmit the driving force to the clamping arm, causing it to clamp the workpiece. The reaction force generated by the clamping arm on the workpiece is transmitted back to the drive assembly, requiring the drive assembly to provide the force to counteract it. Therefore, if a high torque output is required in an existing clamping device, a more powerful power assembly must be installed, resulting in high costs. Utility Model Content

[0004] This application addresses the shortcomings of the prior art by providing a pressing device, comprising: a driving assembly including a piston rod; a transmission assembly including a connecting rod and a rotating member, wherein a first end of the connecting rod is connected to the piston rod, a second end of the connecting rod is connected to the rotating member, the piston rod is movable between a first position and a second position to drive the rotating member to rotate via the connecting rod; and a pressure arm connected to the rotating member, the rotating member being capable of driving the pressure arm to rotate; wherein, when the piston rod is in the first position, the connecting rod is perpendicular to the piston rod.

[0005] Furthermore, the rotating component includes a first gear and a second gear; the first gear is connected to the second end of the connecting rod, and the first gear meshes with the second gear, and the pressure arm is connected to the second gear; wherein, the transmission ratio between the first gear and the second gear is less than 1.

[0006] Furthermore, the first end of the pressure arm is provided with a pressing part, and the second end of the pressure arm is provided with a locking member, which can lock or release the central shaft of the second gear; wherein, when the locking member locks the central shaft, the pressure arm can rotate with the second gear; when the locking member releases the central shaft, the pressure arm can rotate relative to the central shaft to adjust the pressing angle of the pressing part.

[0007] Furthermore, there are multiple locking elements, and along the axial direction of the second gear, the multiple locking elements are respectively located on both sides of the second gear.

[0008] Furthermore, the first gear includes teeth and a wheel body, the teeth being disposed on the circumferential edge of the wheel body, and the wheel body being fan-shaped.

[0009] Furthermore, the clamping device further includes: a housing having a receiving cavity, wherein the connecting rod and at least a portion of the rotating member are disposed within the receiving cavity.

[0010] Furthermore, the sidewall of the receiving cavity is provided with a first sliding groove, which extends along the movement direction of the piston rod; the drive assembly also includes a sliding rod, the first part of which is connected to the piston rod, the second part of which is located in the first sliding groove, and the sliding rod is movable relative to the first sliding groove.

[0011] Furthermore, when the piston rod is in the first position, the sliding rod is located at the end of the first sliding groove to restrict the piston rod from continuing to move in the direction from the second position toward the first position.

[0012] Furthermore, the drive assembly also includes a bearing, the inner ring of which is fitted onto the second rod portion of the sliding rod, and the outer ring of which is connected to the inner wall of the first sliding groove.

[0013] Furthermore, the sidewall of the receiving cavity is provided with a second sliding groove, the extension direction of the second sliding groove corresponding to the movement direction of the second end of the connecting rod; the second end of the connecting rod is provided with a protruding shaft, the protruding shaft is located in the second sliding groove, and can move relative to the second sliding groove.

[0014] The embodiments described in this application have the following beneficial effects: The clamping device provided in this application transmits the driving force generated by the drive assembly to the pressure arm through the transmission assembly, thereby causing the pressure arm to clamp the workpiece. In the first position, the connecting rod in the transmission assembly is arranged perpendicularly to the piston rod of the drive assembly so that the reaction force of the workpiece on the pressure arm cannot be transmitted to the axial direction of the piston rod. The clamping device of this application provides high torque output without replacing the powerful drive assembly, thus expanding the applicability of the clamping device. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. The accompanying drawings in the following description are merely exemplary embodiments of this disclosure.

[0016] Figure 1A This is a schematic diagram of the clamping device in one example of this application (with the housing shown).

[0017] Figure 1BThis is a schematic diagram of the clamping device in one example of this application (with part of the housing removed).

[0018] Figure 2 This is a structural schematic diagram of the locking element and related components in one example of this application.

[0019] Figure 3 This is a schematic diagram of the internal structure of the shell in one example of this application. Figure 4 This is a schematic diagram of the piston rod, sliding rod, connecting rod, and first gear in one example of this application.

[0020] Figure Labels 10. Clamping device; 110. Drive assembly; 111. Piston rod; 112. Sliding rod; 1121. First rod part; 1122. Second rod part; 113. Bearing; 120. Transmission assembly; 121. Connecting rod; 1211. Protruding shaft; 122. First gear; 1221. Tooth; 1222. Wheel body; 123. Second gear; 1231. Central shaft; 130. Pressure arm; 131. Lowering part; 132. Locking element; 140. Housing; 141. First sliding groove; 142. Second sliding groove. Detailed Implementation

[0021] In the following description, exemplary embodiments of the present application will be described in more detail with reference to the accompanying drawings. As will be appreciated by those skilled in the art, the described embodiments can be modified in various ways without departing from the concept or scope of the present application. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive. These embodiments are provided so that this application will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art. Furthermore, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily obscuring the concepts of the present application.

[0022] The accompanying drawings illustrate various structural schematics according to embodiments of this application. These drawings are not to scale, and some details have been enlarged for clarity, while others may be omitted. The shapes of the various structures and devices shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design alternatives according to actual needs. The following related technologies are optional solutions and can be arbitrarily combined with the technical solutions of the embodiments of this application, all of which fall within the protection scope of the embodiments of this application.

[0023] This application provides a clamping device for clamping a workpiece. The workpiece refers to, for example, a workpiece in a machining process. The workpiece can be a single part or an assembly of several parts fixed together. The workpiece can be processed in various ways, including turning, milling, planing, grinding, casting, forging, etc. The clamping device can clamp the workpiece to change its shape or press multiple parts of the workpiece together, or it can be used to fix the workpiece so that other devices can perform other processing steps on it.

[0024] The following is combined with Figure 1A and Figure 1B The clamping device of this application is described in detail. Figure 1A A schematic diagram of the clamping device of this application is shown (with housing). Figure 1B A schematic diagram of the clamping device of this application is shown (with part of the housing removed).

[0025] Figure 1A and Figure 1B As shown, this application provides a pressing device 10, including: a drive assembly 110, including a piston rod 111; a transmission assembly 120, including a connecting rod 121 and a rotating member, wherein a first end of the connecting rod 121 is connected to the piston rod 111, and a second end of the connecting rod 121 is connected to the rotating member, the piston rod 111 is movable between a first position and a second position to drive the rotating member to rotate via the connecting rod 121; and a pressure arm 130 connected to the rotating member, the rotating member being able to drive the pressure arm 130 to rotate; wherein, when the piston rod 111 is in the first position, the connecting rod 121 is arranged perpendicularly to the piston rod 111.

[0026] It is understood that the drive assembly 110 may be, for example, a cylinder. The drive assembly 110 may include, for example, a piston rod 111, a partition, and a chamber, wherein pressure changes within the chamber can cause changes in the volume of the chamber, thereby moving the partition and causing the piston rod 111 to reciprocate.

[0027] It is understandable that a portion of the piston rod 111 extends out of the cylinder, and the length of the portion of the piston rod 111 extending out of the cylinder changes during the reciprocating motion of the piston rod 111.

[0028] The transmission assembly 120 may, for example, consist of multiple transmission elements. The transmission assembly 120 may, for example, include a connecting rod 121 and a rotating element.

[0029] Understandably, link 121 can be a straight rod, a curved rod, or other irregular rod.

[0030] For example, the first end of the connecting rod 121 may be rotatably connected to the piston rod 111 (e.g., hinged or riveted). The reciprocating motion of the piston rod 111 can drive the connecting rod 121 to move. The second end of the connecting rod 121 may be connected to a rotating component. When the connecting rod 121 moves, the connecting rod 121 can drive the rotating component to rotate through the movement of its second end.

[0031] It is understood that the rotating component can be one or more gears. Driven by the connecting rod 121, the rotating component can drive the pressure arm 130 to produce a downward or upward action by rotating.

[0032] The pressure arm 130 can perform a clamping action on the workpiece under the drive of the rotating component. For example, the pressure arm 130 can rotate under the drive of the rotating component, and generate downward pressure on the workpiece by rotation.

[0033] Understandably, the piston rod 111 is capable of moving between the first position and the second position.

[0034] In the first position, piston rod 111 is perpendicular to connecting rod 121. With piston rod 111 in this position, the axial movement of connecting rod 121 generates a force perpendicular to the surface of piston rod 111. That is, in the first position, the movement of piston rod 111 can drive the movement of connecting rod 121, but the movement of connecting rod 121 cannot drive the movement of piston rod 111. At this time, the output torque of pressure arm 130 is independent of the driving force of drive assembly 110. The maximum torque that pressure arm 130 can output depends on the material strength of each component (especially the material strength of the transmission assembly and the piston rod).

[0035] In the second position, the piston rod 111 is not perpendicular to the connecting rod 121. It is worth noting that in the second position, the tendency of the connecting rod 121 to move along its own axial direction can generate a force along the axial direction of the piston rod 111. That is, in the second position, the movement of the connecting rod 121 can drive the piston rod 111 to move.

[0036] The rotating component will now be described in detail.

[0037] like Figure 1B As shown, the rotating component includes a first gear 122 and a second gear 123; the first gear 122 is connected to the second end of the connecting rod 121, and the first gear 122 meshes with the second gear 123, and the pressure arm 130 is connected to the second gear 123; wherein, the transmission ratio between the first gear 122 and the second gear 123 is less than 1.

[0038] For example, the second end of the connecting rod 121 is rotatably connected to the first gear 122 at a non-axial position so that the axial movement of the connecting rod 121 can drive the first gear 122 to rotate.

[0039] The first gear 122 meshes with the second gear 123, for example, the teeth of the first gear 122 mesh with the teeth of the second gear 123. That is, the rotation of the first gear 122 can drive the second gear 123 to rotate. For example, if the first gear 122 rotates clockwise, the second gear 123 will be driven to rotate counterclockwise.

[0040] The pressure arm 130 can be coaxially arranged with the second gear 123. When the second gear 123 rotates, the pressure arm 130 also rotates synchronously to provide pressure (e.g., downward pressure) applied to the workpiece. For example, if the second gear 123 rotates 90° counterclockwise, the pressure arm 130 will also rotate 90° counterclockwise accordingly.

[0041] The transmission ratio between the first gear 122 and the second gear 123 is less than 1. That is, when the first gear 122 rotates, driving the second gear 123 to rotate, the angular velocity of the first gear 122 is less than the angular velocity of the second gear 123. In this case, a smaller rotation angle of the first gear 122 can drive the second gear 123 to rotate a larger rotation angle, thereby increasing the opening and closing angle range of the pressure arm 130. For example, the transmission ratio between the first gear 122 and the second gear 123 is 1:3. If the first gear 122 can rotate 60°, then the second gear 123 can rotate 180°, thus enabling the opening and closing range of the pressure arm 130 to reach 180°.

[0042] For details on the structure of the first gear 122, please refer to [link / reference]. Figure 4 . Figure 4 The structure of the first gear 122 in this application is shown. The first gear 122 includes teeth 1221 and a wheel body 1222. The teeth 1221 are located on the circumferential edge of the wheel body 1222, and the wheel body 1222 is fan-shaped.

[0043] It is understood that the shape of the wheel 1222 can be a portion of a circle, such as a sector or other irregular shape. The central angle of the sector is an acute angle, such as 60°.

[0044] It is worth noting that in this application, the rotation angle range of the first gear 122 is limited, and the number of teeth 1221 that contact the second gear 123 during rotation is also limited. The teeth 1221 do not need to completely cover the circumferential edge of the wheel body 1222. In this case, the shape of the wheel body 1222 can be part of a circle, which can reduce the cost of the gear and also reduce the size of the clamping device 10.

[0045] The following is combined with Figure 2 The pressure arm is described in detail. Figure 2 This is a schematic diagram of the pressure arm in this application.

[0046] The first end of the pressure arm 130 is provided with a pressing part 131, and the second end of the pressure arm 130 is provided with a locking member 132. The locking member 132 can lock or release the central shaft 1231 of the second gear 123. When the locking member 132 locks the central shaft 1231, the pressure arm 130 can rotate with the second gear 123. When the locking member 132 releases the central shaft 1231, the pressure arm 130 can rotate relative to the central shaft 1231 to adjust the pressing angle of the pressing part 131.

[0047] It is understood that the pressing plane of the pressing part 131 may be a shape that matches the workpiece, such as a plane or other shape. The pressing part 131 is used to contact the workpiece surface and provide downward pressure when the pressure arm 130 is rotated to a preset position.

[0048] It is understood that the locking element 132 may include, for example, a first part and a second part (such as...). Figure 2 As shown, the locking member 132 includes an upper part and a lower part. The first part and the second part can engage the central shaft 1231 of the second gear 123. The locking member 132 can be used to rigidly connect the pressure arm 130 to the second gear 123 when the pressure device 10 is performing a pressure operation.

[0049] Exemplarily, the locking member 132 can lock the central shaft 1231 of the second gear 123. The first portion and the second portion can be fastened, for example, by bolts to increase the normal pressure on the surface of the central shaft 1231, thereby providing friction between the central shaft 1231 and the first portion and / or the second portion. When the locking member 132 is in the locked state, rotation of the second gear 123 can drive the pressure arm 130 to rotate, providing downward pressure acting on the surface of the workpiece.

[0050] For example, the locking member 132 can also release the central shaft 1231 of the second gear 123. For instance, the first and second portions can relax the central shaft 1231 to reduce or eliminate the normal pressure on the surface of the central shaft 1231, thereby allowing the locking member 132 and the central shaft 1231 to rotate relative to each other to adjust the position of the pressure arm 130. In this way, the pressure arm 130 can rotate relative to the central shaft 1231, thereby adjusting the pressing angle of the pressing portion 131 (e.g., the angle at which the pressing portion 131 protrudes from the locking member 132) to adapt to workpieces of different shapes. The pressing angle of the pressing portion 131 can, for example, be any value between 0° and 90°.

[0051] There are multiple locking elements 132, which are located on both sides of the second gear 123 along the axial direction of the second gear 123.

[0052] Understandably, the number of locking elements 132 can be, for example, two. Multiple locking elements 132 respectively engage the central shaft 1231 from both sides of the second gear 123. During the rotation of the pressure arm 130 driven by the second gear 123, the frictional force between the locking elements 132 and the central shaft 1231 is distributed on both sides of the central shaft 1231. In this case, the torsional force on the central shaft 1231 is distributed at multiple locations on the central shaft 1231, reducing the risk of breakage of the central shaft 1231.

[0053] The following is combined with Figure 3 and Figure 4 The housing and / or drive components are described in detail. Figure 3 This is a schematic diagram of the shell structure in this application. Figure 4 The structure of the piston rod, sliding rod, connecting rod, and first gear in this application is shown.

[0054] like Figure 3 As shown, the clamping device 10 further includes: a housing 140 having a receiving cavity, and a connecting rod 121 and at least part of the rotating member being disposed within the receiving cavity.

[0055] Exemplarily, portions of the connecting rod 121, the first gear 122, and the second gear 123 are disposed within the receiving cavity, with the central shaft 1231 of the second gear 123 extending out of the receiving cavity and thus connected to the pressure arm 13. The housing 140 may be made of a rigid material, such as aluminum alloy. The housing 140 may be used to protect the components within the receiving cavity.

[0056] The side wall of the receiving cavity is provided with a first sliding groove 141, which extends along the movement direction of the piston rod 111; the drive assembly 110 also includes a sliding rod 112, the first rod portion 1121 of the sliding rod 112 is connected to the piston rod 111, the second rod portion 1122 of the sliding rod 112 is located in the first sliding groove 141, and the sliding rod 112 can move relative to the first sliding groove 141.

[0057] For example, the first sliding groove 141 may be a strip-shaped groove on the inner surface of the receiving cavity. The first sliding groove 141 may, for example, limit the movement trajectory of the piston rod 111 by restricting the movement of the sliding rod 112.

[0058] like Figure 4 As shown, the first rod portion 1121 of the sliding rod 112 is fixedly connected to the piston rod 111, and the fixed connection may be, for example, a bolt connection or a key connection.

[0059] The second rod portion 1122 of the sliding rod 112 is located in the first sliding groove 141, for example, a part of the second rod portion 1122 can extend into the first sliding groove 141.

[0060] The sliding rod 112 can move relative to the first sliding groove 141, for example, the sliding rod 112 can move along the extension direction of the first sliding groove 141.

[0061] It should be noted that during the process of the drive assembly 110 driving the piston rod 111 to move, the piston rod 111 drives the sliding rod 112 to move. The first sliding groove 141 ensures that the piston rod 111 moves along the extension direction of the first sliding groove 141 by restricting the movement direction of the second rod part 1122.

[0062] When the piston rod 111 is in the first position, the sliding rod 112 is located at the end of the first sliding groove 141 to limit the piston rod 111 from continuing to move in the direction from the second position toward the first position.

[0063] As described above, when the piston rod 111 is in the first position, the connecting rod 121 is perpendicular or substantially perpendicular to the piston rod 111. The perpendicularity means that the angle between the connecting rod 121 and the piston rod 111 is 90°. The substantially perpendicularity means that the angle between the connecting rod 121 and the piston rod 111 has a certain margin of error compared to 90°.

[0064] When the sliding rod 112 is located at the end of the first sliding groove 141, the end of the first sliding groove 141 restricts the sliding rod 112 from continuing to move towards the end. In this case, the end of the first sliding groove 141 can restrict the piston rod 111 from continuing to move from the second position toward the first position.

[0065] For example, as the piston rod 111 moves from the second position to the first position, the connecting rod 121 drives the first gear 122 to rotate clockwise. The first gear 122 drives the second gear 123 to rotate counterclockwise. The pressure arm 130 is driven by the second gear 123 to rotate counterclockwise to generate downward pressure on the workpiece.

[0066] It is worth noting that after the piston rod 111 reaches the first position, it moves from the second position toward the first position. This causes the connecting rod 121 to rotate, driving the first gear 122 to rotate counterclockwise (the opposite of the aforementioned clockwise direction). The second gear 123 is driven clockwise by the first gear 122, which in turn causes the pressure arm 130 to rotate clockwise. During this process, the downward pressure exerted by the pressure arm 130 on the workpiece decreases or disappears.

[0067] In summary, when the piston rod 111 is in the first position, the pressure arm 130 can maintain maximum downward pressure on the workpiece. It is worth noting that the piston rod 111 can be held in the first position by the end restriction of the first sliding groove 141, thereby allowing the pressure arm 130 to maintain maximum downward pressure on the workpiece.

[0068] The drive assembly 110 also includes a bearing 113, the inner ring of which is fitted onto the second rod portion 1122 of the sliding rod 112, and the outer ring of which is connected to the inner wall of the first sliding groove 141.

[0069] For example, the inner ring of the bearing 113 can be fixed relative to the second rod portion 1122 via an interference fit, and the outer ring of the bearing 113 can abut against the interior of the first sliding groove 141. During the movement of the second rod portion 1122 along the first sliding groove 141, the bearing 113 can convert the original sliding friction between the second rod portion and the inner wall of the first sliding groove 141 into rolling friction within the bearing 113, thereby reducing resistance.

[0070] The side wall of the receiving cavity is also provided with a second sliding groove 142, the extension direction of the second sliding groove 142 is corresponding to the movement direction of the second end of the connecting rod 121; the second end of the connecting rod 121 is provided with a protruding shaft 1211, the protruding shaft 1211 is located in the second sliding groove 142, and can move relative to the second sliding groove 142.

[0071] For example, the second sliding groove 142 may be a strip-shaped groove on the inner surface of the receiving cavity. The second sliding groove 142 may, for example, limit the movement trajectory of the second end of the connecting rod 121 by restricting the movement of the protruding shaft 1211. For example, the second sliding groove 142 may be an arc-shaped groove.

[0072] The protruding shaft 1211 can be fixed relative to the second end of the connecting rod 121. In addition, the protruding shaft 1211 can also serve as a hinge shaft to be hinged to the first gear 122 so that the connecting rod 121 and the first gear 122 can be rotatably connected.

[0073] At least a portion of the protruding shaft 1211 extends into the second sliding groove 142. During the movement of the protruding shaft 1211 relative to the second sliding groove 142, the second sliding groove 142 guides the protruding shaft 1211 to move along the extension direction of the second sliding groove 142, thereby restricting the movement of the second end of the connecting rod 121.

[0074] A bearing can also be provided between the protruding shaft 1211 and the second sliding groove 142 to reduce the resistance to relative movement. The bearing is arranged in a similar manner to the bearing 113 described above, and will not be repeated here.

[0075] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0076] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0077] In this application, unless otherwise stated, directional terms such as "up" and "down" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" are generally used in relation to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this application.

[0078] The above description is merely an exemplary embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope described in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A clamping device, comprising: The drive assembly (110) includes a piston rod (111). The transmission assembly (120) includes a connecting rod (121) and a rotating member. The first end of the connecting rod (121) is connected to the piston rod (111), and the second end of the connecting rod (121) is connected to the rotating member. The piston rod (111) can move between a first position and a second position to drive the rotating member to rotate via the connecting rod (121). as well as The pressure arm (130) is connected to the rotating component, which can drive the pressure arm (130) to rotate; When the piston rod (111) is in the first position, the connecting rod (121) is arranged perpendicular to the piston rod (111).

2. The clamping device according to claim 1, wherein, The rotating component includes a first gear (122) and a second gear (123); the first gear (122) is connected to the second end of the connecting rod (121), and the first gear (122) meshes with the second gear (123), and the pressure arm (130) is connected to the second gear (123); The transmission ratio between the first gear (122) and the second gear (123) is less than 1.

3. The clamping device according to claim 2, wherein, The first end of the pressure arm (130) is provided with a pressing part (131), and the second end of the pressure arm (130) is provided with a locking member (132). The locking member (132) can lock or release the central shaft (1231) of the second gear (123). When the locking member (132) locks the central shaft (1231), the pressure arm (130) can rotate with the second gear (123); when the locking member (132) releases the central shaft (1231), the pressure arm (130) can rotate relative to the central shaft (1231) to adjust the pressing angle of the pressing part (131).

4. The clamping device according to claim 3, wherein, The number of locking elements (132) is multiple, and along the axial direction of the second gear (123), the multiple locking elements (132) are respectively located on both sides of the second gear (123).

5. The clamping device according to claim 2, wherein, The first gear (122) includes teeth (1221) and a wheel body (1222). The teeth (1221) are located on the circumferential edge of the wheel body (1222), and the wheel body (1222) is fan-shaped.

6. The clamping device according to any one of claims 1 to 5, wherein, The clamping device further includes: The housing (140) has a receiving cavity, in which the connecting rod (121) and at least part of the rotating member are disposed.

7. The clamping device according to claim 6, wherein, The side wall of the receiving cavity is provided with a first sliding groove (141), which extends along the movement direction of the piston rod (111). The drive assembly (110) further includes a sliding rod (112), the first rod portion (1121) of the sliding rod (112) is connected to the piston rod (111), the second rod portion (1122) of the sliding rod (112) is located in the first sliding groove (141), and the sliding rod (112) is movable relative to the first sliding groove (141).

8. The clamping device according to claim 7, wherein, When the piston rod (111) is in the first position, the sliding rod (112) is located at the end of the first sliding groove (141) to restrict the piston rod (111) from continuing to move in the direction from the second position toward the first position.

9. The clamping device according to claim 7, wherein, The drive assembly (110) also includes a bearing (113), the inner ring of which is fitted onto the second rod portion (1122) of the sliding rod (112), and the outer ring of which is connected to the inner wall of the first sliding groove (141).

10. The clamping device according to claim 6, wherein, The side wall of the receiving cavity is also provided with a second sliding groove (142), and the extension direction of the second sliding groove (142) corresponds to the movement direction of the second end of the connecting rod (121); The second end of the connecting rod (121) is provided with a protruding shaft (1211), which is located in the second sliding groove (142) and can move relative to the second sliding groove (142).

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