Gripper with adjustable clamping force

Abstract

The application discloses a clamping force adjustable clamp, and relates to the technical field of clamps, wherein the clamping force adjustable clamp comprises an elastic component, a first chuck component, a second chuck component, a first adjusting piece and a shell, one end of the first chuck component is provided with a first contact part; one end of the second chuck component is provided with a second contact part; the first chuck component and the second chuck component are rotatably connected with the shell; the elastic component is arranged in a containing cavity formed between the first chuck component and the second chuck component; the first chuck component is further provided with an adapting hole, the adapting hole penetrates through the first chuck component and is in communication with the containing cavity, the first adjusting piece is arranged in the adapting hole, and the first adjusting piece is movable along the adapting hole; the clamping force of the clamping force adjustable clamp is adjusted through cooperation of the first adjusting piece and the elastic component, the situation that a bar is separated from a machine and damaged due to mismatching of the clamping force is effectively avoided, and the production cost is reduced.

Description

Technical Field

[0001] This application relates to the field of clamping device structure technology, and in particular to a clamping device with adjustable clamping force. Background Technology

[0002] In the existing technology, clamps are widely used. When clamping bar stock, the bar stock is easy to detach from the clamp, so the requirements for clamps are higher. However, the existing clamps commonly used have a relatively simple clamping force. The clamping force of such clamps is not adjustable, which may cause the clamping force to be mismatched when clamping small diameter bar stock, resulting in the bar stock detaching from the clamp and thus increasing production costs. Utility Model Content

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a clamping device with adjustable clamping force, which can adjust the clamping force to prevent the bar stock from detaching and reduce production costs.

[0004] An adjustable clamping force clamp according to a first aspect embodiment of this application includes a first chuck assembly, one end of which has a first contact portion; a second chuck assembly, one end of which has a second contact portion, the first contact portion and the second contact portion forming a clamping hole for clamping a bar stock; a housing, to which both the first and second chuck assemblies are rotatably connected; an elastic component, between which a receiving cavity is formed for housing the elastic component, the elastic component providing clamping force to the bar stock; and a first adjusting member, the first chuck assembly further having an adapter hole, the adapter hole penetrating the first chuck assembly and communicating with the receiving cavity, the first adjusting member being disposed within the adapter hole and movable along the adapter hole, the first adjusting member being used to compress or release the elastic component to increase or decrease the clamping force on the bar stock.

[0005] The adjustable clamping force clamp according to the embodiments of this application has at least the following beneficial effects: In this application, the first clamping assembly and the second clamping assembly are connected through a housing, and the first contact portion and the second contact portion are provided to abut against the bar stock to be clamped, thereby achieving the clamping effect on the bar stock; the first adjusting member is configured to abut against the elastic component, so that when the first adjusting member compresses the elastic component, the clamping force of the first contact portion and the second contact portion on the bar stock increases, and when the first adjusting member releases the elastic component, the clamping force of the first contact portion and the second contact portion on the bar stock decreases, thereby achieving the adjustment of the clamping force, increasing the application scenarios of the adjustable clamping force clamp of this application, effectively preventing the bar stock from detaching, and reducing production costs.

[0006] According to some embodiments of this application, the other end of the first clamping assembly is provided with a first limiting portion, and the other end of the second clamping assembly is provided with a second limiting portion that matches the first limiting portion. The first limiting portion and the second limiting portion are used to restrict the second clamping assembly from disengaging from the first clamping assembly.

[0007] According to some embodiments of this application, an eccentric rod is also included. The first chuck assembly has a through hole at one end near the first contact portion. A first region is formed between the first contact portion and the second contact portion. The through hole communicates with the first region. The eccentric rod is used to abut against the bottom of one end of the bar stock.

[0008] According to some embodiments of this application, the vertical distances from each point on the outer surface of the eccentric rod in the circumferential direction about the rotation axis of the eccentric rod to the rotation axis are not equal.

[0009] According to some embodiments of this application, it further includes a first wear-resistant block and a second wear-resistant block. The first wear-resistant block is disposed on the side of the first contact portion near the bar stock, and the first contact portion is in contact with the bar stock through the first wear-resistant block. The second wear-resistant block is disposed on the side of the second contact portion near the bar stock, and the second contact portion is in contact with the bar stock through the second wear-resistant block.

[0010] According to some embodiments of this application, the first contact portion is a dovetail groove structure.

[0011] According to some embodiments of this application, the housing includes a first housing and a second housing, and the first clamping assembly and the second clamping assembly are disposed between the first housing and the second housing;

[0012] The first clamp assembly has a first connecting rod extending through it, one end of the first connecting rod is connected to the first housing, and the other end of the first connecting rod is connected to the second housing;

[0013] The second clamp assembly has a second connecting rod extending through it. One end of the second connecting rod is connected to the first housing, and the other end of the second connecting rod is connected to the second housing.

[0014] According to some embodiments of this application, a second adjusting member and a third adjusting member are also included, wherein the first contact portion and the first wear-resistant block are connected by the second adjusting member, and the second contact portion and the second wear-resistant block are connected by the third adjusting member.

[0015] According to some embodiments of this application, a connecting plate is also included, which covers the receiving cavity, one side of the connecting plate abuts against the elastic component, the other side of the connecting plate abuts against the second clamping component, and one end of the first adjusting member near the receiving cavity abuts against the elastic component through the connecting plate.

[0016] According to some embodiments of this application, the first wear-resistant block is provided with a first arc-shaped contact surface, the arc surface of the first arc-shaped contact surface facing the second wear-resistant block, the second wear-resistant block is provided with a second arc-shaped contact surface and a third arc-shaped contact surface, the arc surfaces of the second arc-shaped contact surface and the arc surfaces of the third arc-shaped contact surface both facing the first wear-resistant block, one end of the second arc-shaped contact surface is connected to the adjacent end of the third arc-shaped contact surface to form a connecting part for contacting the outer peripheral surface of the bar stock, the two ends of the first arc-shaped contact surface are used to contact the outer peripheral surface of the bar stock respectively, and the first arc-shaped contact surface and the connecting part are used to form a three-point contact clamping structure for the outer peripheral surface of the bar stock.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a cross-sectional schematic diagram of a clamping device with adjustable clamping force according to an embodiment of this application;

[0020] Figure 2 This is a schematic diagram of an adjustable clamping force holder according to an embodiment of this application;

[0021] Figure 3 for Figure 2 A schematic diagram of the disassembled clamp with adjustable clamping force shown.

[0022] Figure 4 for Figure 2 A schematic diagram of the clamping force adjustable device from another perspective.

[0023] Figure label:

[0024] First chuck assembly 100; slot 101; first contact portion 102; first wear-resistant block 103; connecting plate 104; second chuck assembly 110; first protrusion 111; second contact portion 112; second wear-resistant block 113; through hole 114; second protrusion 115; spring 120; first adjusting member 130; first connecting rod 140; second connecting rod 150; eccentric rod 160; positioning pin 170; bar stock 180; first housing 190; second housing 200. Detailed Implementation

[0025] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0026] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do 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. Therefore, they should not be construed as limitations on this application.

[0027] In the description of this application, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0028] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0029] Currently, clamps are widely used in various fields, but most clamps have relatively simple functions and are highly targeted. They are often designed only for the bar stock 180 that needs to be clamped, resulting in a relatively simple clamping force and a small range of applications. That is, when faced with bar stock 180 with a smaller diameter to be clamped, the clamping force may not be suitable, causing the bar stock 180 to fall off the clamp, resulting in damage to the bar stock 180 and increasing production costs.

[0030] Based on this, this application proposes a clamping device with adjustable clamping force, which can adjust the clamping force to prevent the bar stock from detaching and reduce production costs.

[0031] It is understood that the clamping force adjustable clamp of this application includes an elastic component, a first chuck assembly 100, a second chuck assembly 110, a first adjusting member 130, and a housing. One end of the first chuck assembly is provided with a first contact portion 102; one end of the second chuck assembly 110 is provided with a second contact portion 112, and the first contact portion 102 and the second contact portion 112 form a clamping hole for clamping the bar stock. Both the first chuck assembly 100 and the second chuck assembly 110 are rotatably connected to the housing. An elastic component is formed between the first chuck assembly 100 and the second chuck assembly 110 for providing a receiving cavity for the elastic component. The elastic component is used to provide clamping force for the bar stock. The first chuck assembly 100 is also provided with an adapter hole, which penetrates the first chuck assembly 100 and communicates with the receiving cavity. The first adjusting member 130 is disposed in the adapter hole and can move along the adapter hole. The first adjusting member 130 is used to compress or release the elastic component to increase or decrease the clamping force on the bar stock.

[0032] The beneficial effects of the adjustable clamping force clamp of this application embodiment can be manifested as follows: In this application, the first clamping assembly 100 and the second clamping assembly 110 are connected through a housing. The first contact portion 102 and the second contact portion 112 are provided to abut against the bar stock 180 to be clamped, thereby achieving the clamping effect on the bar stock 180. The first adjusting member 130 is set to abut against the elastic component, so that when the first adjusting member 130 compresses the elastic component, the clamping force of the first contact portion 102 and the second contact portion 112 on the bar stock 180 increases, and when the first adjusting member 130 releases the elastic component, the clamping force of the first contact portion 102 and the second contact portion 112 on the bar stock 180 decreases, thereby achieving the adjustment of the clamping force, increasing the application scenarios of the adjustable clamping force clamp of this application, and effectively preventing the bar stock 180 from detaching, reducing production costs.

[0033] For example, in some embodiments, reference is made to Figure 1In this embodiment, the first clamp assembly 100 is connected to the second clamp assembly 110 through the housing to prevent the second clamp assembly 110 from detaching from the first clamp assembly during use, thus affecting the performance. The first clamp assembly 100 and the second clamp assembly 110 are detachably connected, which facilitates the individual replacement of the first clamp assembly 100 and the second clamp assembly 110. Compared with the traditional integrated clamp, the detachable design allows the clamp to be disassembled and replaced individually when the first clamp assembly 100 or the second clamp assembly 110 is damaged, without having to replace the entire clamp, thereby reducing the cost of use.The elastic component is a spring 120, which is disposed in the receiving cavity of the second chuck assembly 110. The end of the spring 120 away from the first chuck assembly 100 abuts against the receiving cavity. When in use, the adjustable clamping force clamp of this application provides an upward thrust to the end of the second chuck assembly 110 with the receiving cavity, compressing the spring 120. The end of the second chuck assembly 110 with the receiving cavity moves towards the first chuck assembly 100, thereby causing the first contact portion 102 to move away from the second contact portion 112. At this time, the clamp is in an open state, allowing the bar stock 180 to be removed or placed in. When the thrust disappears, the spring 120 returns to its original position, causing the first contact portion 102 to move away from the second contact portion 112. The end of the second chuck assembly 110 with a receiving cavity moves away from the first chuck assembly 100, thereby driving the first contact part 102 to move closer to the second contact part 112, so that the first contact part 102 and the second contact part 112 clamp the bar stock 180. At this time, the chuck is in a clamping state. The first adjusting member 130 is a grommet screw, and the adapter hole is a threaded hole with a thread that is compatible with the grommet screw. The first adjusting member 130 can move along the adapter hole. When the first adjusting member 130 moves closer to the spring 120 and compresses the spring 120, the spring 120 will generate a reaction force on the first adjusting member 130, so that the first adjusting member 130 drives the second chuck assembly 100 to move closer to the first contact part 112. A chuck assembly 100 moves away from the spring 120. Since the end of the spring 120 away from the first chuck assembly 100 abuts against the receiving cavity, the second chuck assembly 110 also moves away from the spring 120 due to the force of the spring 120. That is, the first chuck assembly 100 and the second chuck assembly 110 move away from each other, thereby causing the first contact portion 102 and the second contact portion 112 to move closer to each other. This increases the clamping force on the bar stock 180. In other words, the greater the compression of the spring 120 by the first adjusting member 130, the greater the clamping force of the first contact portion 102 and the second contact portion 112 on the bar stock 180. Conversely, when the first adjusting member 130 moves away from the spring 120 along the adapter hole, the compression of the spring 120 by the first adjusting member 130 gradually decreases. Therefore, the clamping force of the first contact portion 102 and the second contact portion 112 when clamping the bar stock 180 also gradually decreases. Thus, the clamping force of the clamping device is adjusted by the first adjusting member 130. Compared with the traditional clamping device with a single clamping force, the clamping force adjustable clamping device of this application can adjust the clamping force, thereby effectively avoiding the situation where the bar stock 180 is detached from the clamping device due to the mismatch between the clamping force of the clamping device and the diameter of the bar stock 180, resulting in damage to the bar stock 180, thereby reducing production costs.

[0034] It should be noted that: spring 120 is a disc spring 120, and the clamping force adjustment range is 5 to 200N; the thrust can be achieved in pneumatic mode or hydraulic mode. In pneumatic mode, it is driven by 0.6MPa compressed air, and in hydraulic mode, it is driven by 10MPa oil pressure.

[0035] It is understood that the other end of the first clamp assembly 100 is provided with a first limiting part, and the other end of the second clamp assembly 110 is provided with a second limiting part that matches the first limiting part. The first limiting part and the second limiting part are used to restrict the second clamp assembly 110 from disengaging from the first clamp assembly 100.

[0036] For example, in some embodiments, reference is made to Figure 1 In this embodiment, the first limiting part is the first protrusion 111 and the second limiting part is the groove 101. The cooperation between the first protrusion 111 and the groove 101 facilitates the prevention of the adjustable clamping force clamp of this application from detaching from the first clamping assembly 100 when using the second clamping assembly 110, thereby affecting the clamping effect.

[0037] It is understood that the clamping force adjustable clamp of this application also includes an eccentric rod 160, and the first chuck assembly 100 is provided with a through hole 114 at one end near the first contact portion 102. A first region is formed between the first contact portion 102 and the second contact portion 112. The through hole 114 communicates with the first region. The eccentric rod 160 is used to abut against the bottom of one end of the bar stock 180.

[0038] For example, in some embodiments, reference is made to Figure 1 In this embodiment, the eccentric rod 160 abuts against the bottom of the bar stock 180, which can better stabilize the clamped bar stock 180.

[0039] Furthermore, in some embodiments, the first chuck assembly 100 is also provided with a second protrusion 115, which is used to lock and connect with the processing equipment of the external tool. The axis of the second protrusion 115 overlaps with the axis of the first region to ensure the concentricity of the clamping force adjustable clamp of this application after it is connected with the external tool equipment, thereby making the processing of the bar stock 180 more stable and efficient.

[0040] It is understandable that the perpendicular distances from each point on the outer surface of the eccentric rod 160 in the circumferential direction around the rotation axis of the eccentric rod 160 to the rotation axis are not equal.

[0041] For example, in some embodiments, reference is made to Figure 1In this embodiment, the eccentric rod 160 is movably disposed within the through hole 114. The eccentric rod 160 can rotate along its own rotation axis. The bottom of the bar stock 180 abuts against the outer surface of the eccentric rod 160. The vertical distances from each point on the outer surface of the eccentric rod 160 to the rotation axis in the circumferential direction are not equal. This allows the eccentric rod 160 to be rotated to adjust the feeding depth of the bar stock 180, i.e., to increase or decrease the portion of the bar stock 180 that penetrates into the adjustable clamping force holder of this application. This changes the clamping position of the first contact portion 102 and the second contact portion 112 on the bar stock 180, so as to adapt to more specifications of bar stock 180 and increase the application range and scenarios of clamping of this application. The adjustment range of the feeding depth is 0 to 0.2 mm. The outer surface of the eccentric rod 160 is also connected to the positioning pin 170 on the side near the bar stock 180. The positioning pin 170 is used to rotate the positioning pin 170 towards the eccentric rod 160 after the eccentric rod 160 is rotated to the appropriate position, until it abuts against the eccentric rod 160, so as to fix the eccentric rod 160 and prevent the eccentric rod 160 from rotating and affecting the clamping effect when the clamping force adjustable clamp is used.

[0042] It is understood that the clamping force adjustable clamp of this application also includes a first wear-resistant block 103 and a second wear-resistant block 113. The first wear-resistant block 103 is disposed on the side of the first contact portion 102 near the bar stock 180, and the first contact portion 102 is in contact with the bar stock 180 through the first wear-resistant block 103. The second wear-resistant block 113 is disposed on the side of the second contact portion 112 near the bar stock 180, and the second contact portion 112 is in contact with the bar stock 180 through the second wear-resistant block 113.

[0043] For example, in some embodiments, reference is made to Figure 4 and Figure 2 In this embodiment, the first wear-resistant block 103 is embedded in the first contact portion 102, and the second wear-resistant block 113 is embedded in the second contact portion 112. The materials of the first wear-resistant block 103 and the second wear-resistant block 113 can be diamond, cubic boron nitride (CBN) coating, etc. The arrangement of the first wear-resistant block 103 and the second wear-resistant block 113 helps to reduce the wear rate, improve the service life of the clamping force adjustable clamp of this application, and reduce production costs.

[0044] It is understandable that the first contact part 102 has a dovetail groove structure.

[0045] For example, in some embodiments, reference is made to Figure 4 and Figure 2 In this embodiment, the first contact part 102 and the first wear-resistant block 103 are detachable structures. The first contact part 102 is a dovetail groove structure. The design of the dovetail groove structure facilitates the quick alignment of the first contact part 102 and the first wear-resistant block 103, thereby improving the replacement efficiency of the first wear-resistant block 103.

[0046] It should be noted that the cone angle of the dovetail groove structure is 7 degrees.

[0047] It is understood that: the housing includes a first housing and a second housing, and a first clamping assembly and a second clamping assembly are disposed between the first housing and the second housing; a first connecting rod passes through the first clamping assembly, one end of the first connecting rod is connected to the first housing, and the other end of the first connecting rod is connected to the second housing; a second clamping assembly passes through the second connecting rod, one end of the second connecting rod is connected to the first housing, and the other end of the second connecting rod is connected to the second housing.

[0048] For example, in some embodiments, reference is made to Figure 1 and Figure 3 In this embodiment, the first clamp assembly 100 and the second clamp assembly 110 are detachably connected through a first housing, a second housing, a first connecting rod, and a second connecting rod. The first housing 190 and the second housing 200 are located on opposite sides of the first clamp assembly 100 and the second clamp assembly 110. The first clamp assembly 100 has a first connecting rod 140 passing through it, and both ends of the first connecting rod 140 are connected to the first housing 190 and the second housing 200, respectively. The second clamp assembly 110 has a second connecting rod 150 passing through it, and both ends of the second connecting rod 150 are connected to the first housing 190 and the second housing 200, respectively. The arrangement of the first housing 190 and the second housing 200 facilitates further fixing the position of the first clamp assembly 100 and the second clamp assembly 110, preventing them from detaching from each other during use and affecting the clamping effect. At the same time, the arrangement of the first housing 190 and the second housing 200 can also provide some protection for internal components such as the spring 120 and the first adjusting member 130, reducing the risk of damage and lowering costs.

[0049] It is understood that the clamping force adjustable clamp of this application also includes a second adjusting member and a third adjusting member, the first contact part 102 and the first wear-resistant block 103 are connected by the second adjusting member, and the second contact part 112 and the second wear-resistant block 113 are connected by the third adjusting member.

[0050] For example, in some embodiments, the first connecting part is detachably connected to the first wear-resistant block 103 via a second adjusting member, and the second connecting part is detachably connected to the second wear-resistant block 113 via a third adjusting member. The detachable connection facilitates the replacement of the first wear-resistant block 103 and the second wear-resistant block 113 with different inner diameters, so as to adapt to more specifications of bar stock 180 and increase the application scenarios and scope of the clamping force adjustable clamp of this application.

[0051] It is understood that the clamping force adjustable clamp of this application also includes a connecting plate 104, which covers the receiving cavity. One side of the connecting plate 104 abuts against the elastic component, and the other side of the connecting plate 104 abuts against the second clamping assembly 110. The end of the first adjusting member 130 near the receiving cavity abuts against the elastic component through the connecting plate 104.

[0052] For example, in some embodiments, reference is made to Figure 1 and Figure 3 In this embodiment, one end of the connecting plate 104 abuts against the spring 120, and the other end of the connecting plate 104 abuts against the first adjusting member 130. The first connecting plate 104 covers the receiving cavity, so that when the first adjusting member 130 compresses the spring 120 through the connecting plate 104, the spring 120 is subjected to more uniform force, avoiding the spring 120 from being subjected to uneven force for a long time and reducing the service life of the spring 120, thereby reducing production costs.

[0053] It is understood that: the first wear-resistant block 103 is provided with a first arc-shaped contact surface, the arc surface of the first arc-shaped contact surface faces the second wear-resistant block 113, the second wear-resistant block 113 is provided with a second arc-shaped contact surface and a third arc-shaped contact surface, the arc surfaces of the second arc-shaped contact surface and the arc surfaces of the third arc-shaped contact surface both face the first wear-resistant block 103, one end of the second arc-shaped contact surface is connected to the adjacent end of the third arc-shaped contact surface to form a connecting part for contacting the outer peripheral surface of the bar stock 180, the two ends of the first arc-shaped contact surface are used to contact the outer peripheral surface of the bar stock 180 respectively, and the first arc-shaped contact surface and the connecting part are used to form a three-point contact clamping structure for the outer peripheral surface of the bar stock 180.

[0054] For example, in some embodiments, reference is made to Figure 4 In this embodiment, the first wear-resistant block 103 is provided with a first arc-shaped contact surface, and the second wear-resistant block 113 is provided with a second arc-shaped contact surface and a third arc-shaped contact surface. The design of forming three contact points with the bar stock 180 through the first arc-shaped contact surface, the second arc-shaped contact surface and the third arc-shaped contact surface, that is, the two ends of the first arc-shaped contact surface contact the bar stock 180 respectively, and the connection part of the second arc-shaped contact surface and the third arc-shaped contact surface also contacts the bar stock 180, thereby realizing three-point positioning of the bar stock 180. Compared with the traditional two-point positioning with two contact points, the three-point contact positioning structure can ensure that the bar stock 180 is more stable and firm during processing.

[0055] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A clamping device with adjustable clamping force, characterized in that, include: A first chuck assembly, wherein one end of the first chuck assembly is provided with a first contact portion; The second chuck assembly has a second contact portion at one end, and the first contact portion and the second contact portion form a clamping hole for clamping the bar stock. The housing, the first chuck assembly and the second chuck assembly are both rotatably connected to the housing; An elastic component is provided, wherein a receiving cavity for providing the elastic component is formed between the first chuck assembly and the second chuck assembly, and the elastic component is used to provide clamping force for the bar stock; The first adjusting member, the first chuck assembly is further provided with an adapter hole, the adapter hole penetrates the first chuck assembly and communicates with the receiving cavity, the first adjusting member is disposed in the adapter hole, the first adjusting member can move along the adapter hole, the first adjusting member is used to compress or release the elastic component to increase or decrease the clamping force on the bar stock.

2. The clamping force adjustable clamping device according to claim 1, characterized in that, The other end of the first clamping assembly is provided with a first limiting part, and the other end of the second clamping assembly is provided with a second limiting part that matches the first limiting part. The first limiting part and the second limiting part are used to restrict the second clamping assembly from disengaging from the first clamping assembly.

3. The clamping force adjustable clamping device according to claim 1, characterized in that, It also includes an eccentric rod, and the first chuck assembly has a through hole at one end near the first contact portion. A first region is formed between the first contact portion and the second contact portion. The through hole communicates with the first region. The eccentric rod is used to abut against the bottom of one end of the bar stock.

4. The clamping force adjustable clamping device according to claim 3, characterized in that, The perpendicular distances from each point on the outer surface of the eccentric rod in the circumferential direction around the rotation axis to the rotation axis are not equal.

5. The clamping force adjustable clamping device according to claim 1, characterized in that, It also includes a first wear-resistant block and a second wear-resistant block. The first wear-resistant block is disposed on the side of the first contact portion near the bar stock, and the first contact portion is in contact with the bar stock through the first wear-resistant block. The second wear-resistant block is disposed on the side of the second contact portion near the bar stock, and the second contact portion is in contact with the bar stock through the second wear-resistant block.

6. The clamping force adjustable clamping device according to claim 5, characterized in that, The first contact portion has a dovetail groove structure.

7. The clamping force adjustable clamping device according to claim 1, characterized in that, The housing includes a first housing and a second housing, with the first clamp assembly and the second clamp assembly disposed between the first housing and the second housing; The first clamp assembly has a first connecting rod extending through it, one end of the first connecting rod is connected to the first housing, and the other end of the first connecting rod is connected to the second housing; The second clamp assembly has a second connecting rod extending through it. One end of the second connecting rod is connected to the first housing, and the other end of the second connecting rod is connected to the second housing.

8. The clamping force adjustable clamping device according to claim 5, characterized in that, It also includes a second adjusting member and a third adjusting member, wherein the first contact portion and the first wear-resistant block are connected by the second adjusting member, and the second contact portion and the second wear-resistant block are connected by the third adjusting member.

9. The clamping force adjustable clamping device according to claim 1, characterized in that, It also includes a connecting plate that covers the receiving cavity, one side of the connecting plate abutting against the elastic component, the other side of the connecting plate abutting against the second clamping component, and the end of the first adjusting member near the receiving cavity abutting against the elastic component through the connecting plate.

10. The clamping force adjustable clamping device according to claim 5, characterized in that, The first wear-resistant block has a first arc-shaped contact surface, the arc surface of the first arc-shaped contact surface faces the second wear-resistant block. The second wear-resistant block has a second arc-shaped contact surface and a third arc-shaped contact surface, the arc surfaces of the second arc-shaped contact surface and the third arc-shaped contact surface both face the first wear-resistant block. One end of the second arc-shaped contact surface is connected to the adjacent end of the third arc-shaped contact surface to form a connecting part for contacting the outer peripheral surface of the bar stock. The two ends of the first arc-shaped contact surface are used to contact the outer peripheral surface of the bar stock respectively. The first arc-shaped contact surface and the connecting part are used to form a three-point contact clamping structure for the outer peripheral surface of the bar stock.

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