Clamping device
By designing the limiting rod and rotating chuck structure in the clamping device, the machining accuracy problem caused by inaccurate piston placement is solved, and the accurate positioning of the piston in high-precision process is achieved, and the machining quality of the piston is improved.
Patent Information
- Application Number
- CN202422377950.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-09-27
AI Technical Summary
When the existing handling device places the piston in a production process with high accuracy, it is difficult to ensure the accuracy of the placement position, resulting in unsatisfactory piston processing accuracy.
A clamping device is designed, including a drive member, a clamp, a limiting rod and a rotating chuck. Through the cooperation of the limiting rod and a rotating chuck, the piston is automatically centered to the center position of the multiple rotating chucks when placed, ensuring the accuracy of the placement position.
The placement accuracy of the piston in the production process is improved, the processing accuracy is avoided due to position deviation, and the yield rate of the piston is improved.
Smart Images
Figure CN223117523U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of piston processing, and particularly relates to a clamping device. Background Art
[0002] As an important component of an engine, a piston is often automatically mass-produced through a production line. The piston handling device, as a transfer medium between various production processes of the piston, plays an important role in the process of automatic piston production. When transferring the piston, the handling device needs to first clamp the piston from the previous production process and transfer it to the next production process, and then place the piston at a designated position. However, for some production processes, such as the piston drilling process, there are relatively strict requirements for the placement position of the piston. The placement accuracy of the current handling device is difficult to meet the requirements of these production processes. After the piston is placed in these production processes, the processing accuracy of the piston is often not ideal due to inaccurate placement positions.
[0003] In view of this, it is necessary to provide a clamping device to solve or at least alleviate the above technical problems. Summary of the Utility Model
[0004] The main purpose of the utility model is to propose a clamping device, aiming to solve the technical problem that the processing accuracy of the piston is not ideal due to inaccurate placement positions.
[0005] To achieve the above purpose, the utility model proposes a clamping device, including:
[0006] A driving member;
[0007] A clamping member, the clamping member is installed on the driving member, the clamping member includes a first clamping jaw and a second clamping jaw, the driving member is used to drive the first clamping jaw and the second clamping jaw to move away from or close to each other, the first clamping jaw includes at least two first clamping fingers, the second clamping jaw includes at least two second clamping fingers, and the first clamping fingers and the second clamping fingers are arranged opposite to each other;
[0008] A plurality of limiting rods, each first clamping finger is provided with an independent limiting rod, and each second clamping finger is provided with an independent limiting rod;
[0009] A rotating chuck, the rotating chuck is sleeved on the limiting rod, and the rotating chuck can freely rotate around the limiting rod.
[0010] In an embodiment, the rotating chuck includes a main body and an annular protrusion provided on the outer peripheral surface of the main body. The main body is a cylindrical structure, the number of the annular protrusions is at least one, and at least one annular protrusion is coaxially arranged with the main body.
[0011] In one embodiment, the number of the annular protrusions is at least two, and the at least two annular protrusions are arranged at intervals along the axial direction of the main body. An anti-slip rubber sleeve is sleeved on the outer surface of the annular protrusion.
[0012] In one embodiment, the clamping device further includes an elastic rubber layer, and the elastic rubber layer is disposed around the outer peripheral surface of the rotating chuck.
[0013] In one embodiment, the limiting rod includes a threaded portion, a mounting portion, and a limiting portion;
[0014] The threaded portion is mounted at the bottom of the first clamping finger, or,
[0015] The threaded portion is mounted at the bottom of the second clamping finger;
[0016] The rotating chuck is sleeved on the outside of the mounting portion, and the limiting portion is disposed at the bottom end of the mounting portion to prevent the rotating chuck from falling off.
[0017] In one embodiment, the threaded portion can rotate and extend or retract into the first clamping finger, or,
[0018] The threaded portion can rotate and extend or retract into the second clamping finger.
[0019] In one embodiment, the first clamping finger and the second clamping finger are symmetrically arranged.
[0020] In one embodiment, the driving member includes a driving main body and two sliders. A chute is formed at the bottom of the driving main body, and the sliders are slidably disposed in the chute;
[0021] The top of the first clamping jaw is connected to one of the sliders, and the top of the second clamping jaw is connected to the other slider.
[0022] In one embodiment, two chutes are formed at the bottom of the driving main body, and the two chutes are arranged in parallel. The two sliders are arranged in one-to-one correspondence with the two chutes.
[0023] In one embodiment, the first clamping jaw is detachably connected to one of the sliders, and the second clamping jaw is detachably connected to the other slider.
[0024] In the technical solution provided by the present utility model, the clamping device includes a driving member, a clamping member, a limiting rod, and a rotating chuck. Among them, the clamping member is installed on the driving member. The clamping member includes a first clamping jaw and a second clamping jaw. The driving member is used to drive the first clamping jaw and the second clamping jaw to move away from or close to each other. The first clamping jaw includes at least two first clamping fingers, and the second clamping jaw includes at least two second clamping fingers. The first clamping fingers and the second clamping fingers are arranged opposite to each other. The number of limiting rods is multiple. Each first clamping finger is provided with an independent limiting rod, and each second clamping finger is provided with an independent limiting rod. The rotating chuck is sleeved on the limiting rod, and the rotating chuck can freely rotate around the limiting rod. Through this setting, since the rotating chuck can freely rotate around the limiting rod, the rotating chuck can rotate under the action of the reaction force on the surface of the piston after clamping the piston, so that the piston automatically centers to the central position of multiple rotating chucks. At this time, when the piston is placed in the next production process, the placement position of the piston can be accurately guaranteed, thereby avoiding affecting the processing accuracy of the piston in this production process. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.
[0026] Figure 1 is a schematic structural diagram of an embodiment of the clamping device provided by the present utility model;
[0027] Figure 2 is Figure 1 an exploded schematic diagram of;
[0028] Figure 3 is Figure 2 an enlarged schematic structural diagram of part A in;
[0029] Explanation of the reference numerals in the drawings:
[0030] 100, clamping device; 1, driving member; 11, driving body; 111, chute; 12, slider; 2, clamping member; 21, first clamping jaw; 211, first clamping finger; 22, second clamping jaw; 221, second clamping finger; 3, limiting rod; 31, threaded portion; 32, mounting portion; 33, limiting portion; 4, rotating chuck; 41, annular groove; 42, annular protrusion; 43, body;
[0031] 200, piston.
[0032] The realization, functional features, and advantages of the object of the present utility model will be further described in conjunction with the embodiments with reference to the drawings. Detailed implementation manners
[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0034] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present utility model, such directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.
[0035] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.
[0036] The piston of an engine is one of the core components of the engine, and its design and quality directly affect the thermal efficiency of the engine. With the wide application of automation technology in industrial production, especially in the field of automated production of aluminum alloy gravity casting, the production and processing process of pistons is becoming more and more intelligent and unmanned.
[0037] In each production process of piston production, the piston handling device plays an important role. They are responsible for safely and accurately transferring the piston from one production process to the next, ensuring the continuity and efficiency of the entire production process. On an automated production line, the piston handling device first needs to accurately grip the piston at the end of the previous production process and then smoothly transfer it to the next production process. This process requires the handling device to not only have a strong clamping force to ensure the stability of the piston during handling but also have precise positioning ability to ensure that the piston can be placed in the correct position. Especially in some production processes with strict requirements for the piston placement position, such as the drilling process of the piston, the accuracy and stability of the handling device are particularly important.
[0038] However, according to the applicant's statistical research, it is found that the existing handling devices often fail to meet the production requirements when facing production processes with high-precision requirements. When these handling devices place the piston in production processes such as the drilling process, due to insufficient placement accuracy, the position of the piston often deviates. This deviation will directly affect the machining accuracy of the piston, thereby affecting the quality of the final product. For example, if the hole position of the piston is inaccurate, it may cause unstable performance during the operation of the engine and even may lead to engine failure.
[0039] In view of this, the present utility model proposes a clamping device to solve the above technical problems.
[0040] Please refer to Figure 1 and Figure 2 , in an embodiment of the present utility model, the clamping device 100 includes a driving member 1, a clamping member 2, a limiting rod 3, and a rotating chuck 4. Among them, the clamping member 2 is installed on the driving member 1. The clamping member 2 includes a first jaw 21 and a second jaw 22. The driving member 1 is used to drive the first jaw 21 and the second jaw 22 to move away from or close to each other. The first jaw 21 includes at least two first fingers 211, and the second jaw 22 includes at least two second fingers 221. The first fingers 211 and the second fingers 221 are arranged opposite to each other; the number of limiting rods 3 is multiple, and an independent limiting rod 3 is provided on each first finger 211, and an independent limiting rod 3 is provided on each second finger 221; the rotating chuck 4 is sleeved on the limiting rod 3, and the rotating chuck 4 can rotate freely around the limiting rod 3.
[0041] Specifically, please refer to Figure 2, in this embodiment, the first jaw 21 is provided with two first finger members 211, and the second jaw 22 is provided with two second finger members 221. The first finger members 211 and the second finger members 221 are arranged oppositely. The tops of the first jaw 21 and the second jaw 22 are both connected to the bottom of the driving member 1. The driving member 1 can indirectly drive the first finger members 211 and the second finger members 221 to approach or move away from each other by driving the first jaw 21 and the second jaw 22 to move relatively. In this way, the first finger members 211 and the second finger members 221 can cooperate with each other to realize the function of clamping or placing the piston 200. In another embodiment, the first finger members 211 and the second finger members 221 can both be provided in multiple numbers. For example, the first finger members 211 are provided in two numbers, and the second finger members 221 are provided in three numbers. The arc formed by the tips of the three second finger members 221 can be adapted to the circumferential arc of the surface of the piston 200. In addition, in this embodiment, the clamping device 100 further includes a self-centering adjustment structure, which includes a limiting rod 3 and a rotating chuck 4. At the bottoms of the first finger members 211 and the second finger members 221, the limiting rods 3 are vertically installed. Only one limiting rod 3 is installed at the bottom of each first finger member 211 or each second finger member 221. A rotating chuck 4 is sleeved outside each limiting rod 3. During the process of clamping and transporting the piston 200, only the surface of the piston 200 needs to contact the rotating chuck 4. In this embodiment, the overall shape of the rotating chuck 4 is cylindrical, and the central axis of the rotating chuck 4 coincides with the central axis of the limiting rod 3. Since the rotating chuck 4 can rotate around the limiting rod 3, when clamping the piston 200, even if the placement position of the piston 200 in the previous production process is inaccurate, the piston 200 can be automatically centered by the rotation of the rotating chuck 4, that is, the piston 200 can be moved to the center of the four rotating chucks 4, so as to ensure the accuracy of the placement position when the piston 200 is placed in the next production process, thereby improving the yield rate of the piston 200 production. In this embodiment, one rotating chuck 4 is installed on each limiting rod 3. In other embodiments, according to the different models of the piston 200, two or more rotating chucks 4 can be installed on each limiting rod 3.
[0042] To improve the sensitivity when the rotating chuck 4 rotates, a bearing is installed between the outer surface of the limiting rod 3 and the inner surface of the rotating chuck 4. The bearing includes one of a sliding bearing and a rolling bearing. Through this setting, after each rotating chuck 4 clamps the piston 200, it can rotate in a short time, avoiding the situation that the rotating chuck 4 is difficult to rotate due to excessive friction between the rotating chuck 4 and the limiting rod 3. In addition, in another embodiment, a lubricating layer is coated between the rotating chuck 4 and the limiting rod 3. The lubricating layer includes one of an oil-based lubricating layer, a water-based lubricating layer, and a graphite lubricating layer.
[0043] In the technical solution provided by the present utility model, the clamping device 100 includes a driving member 1, a clamping member 2, a limiting rod 3 and a rotating chuck 4. Among them, the clamping member 2 is installed on the driving member 1. The clamping member 2 includes a first clamping jaw 21 and a second clamping jaw 22. The driving member 1 is used to drive the first clamping jaw 21 and the second clamping jaw 22 to move away from or close to each other. The first clamping jaw 21 includes at least two first clamping fingers 211, and the second clamping jaw 22 includes at least two second clamping fingers 221. The first clamping fingers 211 and the second clamping fingers 221 are arranged opposite to each other. The number of limiting rods 3 is multiple. Each first clamping finger 211 is provided with an independent limiting rod 3, and each second clamping finger 221 is provided with an independent limiting rod 3. The rotating chuck 4 is sleeved on the limiting rod 3, and the rotating chuck 4 can freely rotate around the limiting rod 3. Through this setting, since the rotating chuck 4 can freely rotate around the limiting rod 3, the rotating chuck 4 can rotate under the action of the reaction force on the surface of the piston 200 after clamping the piston 200, so that the piston 200 automatically centers to the central position of the multiple rotating chucks 4. At this time, when the piston 200 is placed in the next production process, the placement position of the piston 200 can be accurately guaranteed, thereby avoiding affecting the processing accuracy of the piston 200 in this production process.
[0044] Further, in an embodiment of the present utility model, the rotating chuck 4 includes a main body 43 and an annular protrusion 42 provided on the outer peripheral surface of the main body 43. The main body 43 is a cylindrical structure. The number of annular protrusions 42 is at least one, and at least one annular protrusion 42 is coaxially arranged with the main body 43. Please refer to Figure 3 , an annular protrusion 42 is circumferentially arranged on the outer peripheral surface of the main body 43 of the rotating chuck 4. An annular groove 41 is formed between two adjacent annular protrusions 42. The annular groove 41 and the annular protrusion 42 are arranged alternately. The annular groove 41 and the annular protrusion 42 are uniformly distributed along the axial direction of the main body 43. By providing the annular groove 41 and the annular protrusion 42, a self-locking structure can be formed between the rotating chucks 4, avoiding the vertical sliding of the piston 200 after being clamped, and improving the stability of the clamping device 100 during the process of clamping the piston 200. At the same time, the rotating chuck 4 can be produced by an integral molding method. By providing the annular groove 41, the amount of material used can be reduced, and the manufacturing cost can be lowered.
[0045] Furthermore, in an embodiment of the present utility model, the number of the annular protrusions 42 is at least two. The at least two annular protrusions 42 are arranged at intervals along the axial direction of the main body 43, and an anti-slip rubber sleeve is sleeved on the outer surface of the annular protrusion 42. Specifically, between the annular grooves 41 are the annular protrusions 42. There are at least two annular protrusions 42 arranged at intervals along the axial direction of the main body 43. The interval distance between two adjacent annular protrusions 42 can be adjusted according to the curved surface radian of the surface of the piston 200, so that the contact area when the rotating chuck 4 contacts the piston 200 is larger. And a layer of anti-slip rubber sleeve is sleeved on the surface of the annular protrusion 42. The types of the anti-slip rubber sleeve include one of a rubber anti-slip rubber sleeve, a silica gel anti-slip rubber sleeve, a PVC anti-slip rubber sleeve, a polyurethane anti-slip rubber sleeve, and a nitrile rubber anti-slip rubber sleeve. Through this setting, the friction between the rotating chuck 4 and the piston 200 can be increased, and the piston 200 can be prevented from falling during transportation.
[0046] In another embodiment, due to the large number of the annular grooves 41 and the small thickness of the annular protrusions 42, it is difficult to individually arrange the anti-slip rubber sleeve on the outside of each annular protrusion 42. Therefore, in an embodiment of the present utility model, the clamping device 100 further includes an elastic rubber layer, and the elastic rubber layer is arranged annularly on the outer peripheral surface of the rotating chuck 4. Specifically, the elastic rubber layer is integrally arranged on the outer peripheral surface of the rotating chuck 4. In this embodiment, the elastic rubber layer is sleeved on the outer peripheral surface of the rotating chuck 4 after being prefabricated in the factory. The production material of the elastic rubber layer includes one of rubber, silica gel, PVC, polyurethane, and nitrile rubber. In another embodiment, the elastic rubber layer is directly coated on the outer peripheral surface of the rotating chuck 4, and the coated elastic rubber layer includes one of a rubber coating, a polyurethane coating, a nano-composite coating, and a particle coating. By providing the elastic rubber layer, the friction between the outer peripheral surface of the rotating chuck 4 and the piston 200 is increased, and the anti-slip rubber layer is arranged on the outer peripheral surface of the rotating chuck 4 by the way of integral prefabrication or direct coating, with simple processes and convenient processing.
[0047] In an embodiment of the present utility model, the limiting rod 3 includes a threaded portion 31, a mounting portion 32, and a limiting portion 33; the threaded portion 31 is mounted at the bottom of the first clamping finger 211, or the threaded portion 31 is mounted at the bottom of the second clamping finger 221; the rotating chuck 4 is sleeved on the outside of the mounting portion 32, and the limiting portion 33 is arranged at the bottom end of the mounting portion 32 to prevent the rotating chuck 4 from falling. Please refer to Figure 2 and Figure 3, the threaded portion 31 is provided with threads, and the limiting rod 3 is connected to the first clamping finger 211 or the second clamping finger 221 through its threaded portion 31. The limiting rod 3 is vertically installed at the bottom of the first clamping finger 211 or the second clamping finger 221. An installation portion 32 is connected to the bottom end of the threaded portion 31. The rotating chuck 4 is installed on the outside of the installation portion 32. At the same time, a limiting portion 33 is connected to the bottom end of the installation portion 32. The limiting portion 33 is used to limit the position of the rotating chuck 4 to prevent the rotating chuck 4 from falling off. Through this setting, the rotating chuck 4 can rotate around the circumference of the installation portion 32 without falling off, so that the piston 200 can be automatically centered under the external force of the first clamping jaw 21 and the second clamping jaw 22 after being clamped.
[0048] Furthermore, in an embodiment of the present invention, the threaded portion 31 can rotate and extend or retract into the first clamping finger 211, or the threaded portion 31 can rotate and extend or retract into the second clamping finger 221. Specifically, the threaded portion 31 adjusts the vertical height of the rotating chuck 4 by adjusting the length of its extension into the bottom end of the first clamping finger 211 or the second clamping finger 221 to adapt to the external shape of pistons 200 of different models. When making adjustments, the vertical heights of all the rotating chucks 4 need to be kept the same to avoid applying an eccentric moment to the piston 200, thereby preventing the piston 200 from shaking or falling during transportation.
[0049] In an embodiment of the present invention, the first clamping finger 211 and the second clamping finger 221 are symmetrically arranged. Specifically, in this embodiment, the number of the first clamping fingers 211 on the first clamping jaw 21 and the number of the second clamping fingers 221 on the second clamping jaw 22 are the same and are symmetrically arranged, such as Figure 1 and Figure 2 , both the first clamping finger 211 and the second clamping finger 221 are provided with two. The two first clamping fingers 211 and the two second clamping fingers 221 are respectively symmetrically arranged. The first clamping finger 211 and the second clamping finger 221 move relatively synchronously. When the piston 200 is clamped or placed, the forces applied to both sides of the piston 200 are the same, preventing the piston 200 from tilting when being clamped, thereby improving the stability of the piston 200 during transportation and further improving the accuracy of placing the piston 200.
[0050] In an embodiment of the present invention, the driving member 1 includes a driving body 11 and two sliders 12. A sliding groove 111 is formed at the bottom of the driving body 11. The sliders 12 are slidably arranged in the sliding groove 111; the top of the first clamping jaw 21 is connected to one of the sliders 12, and the top of the second clamping jaw 22 is connected to the other slider 12. Please refer to Figure 2, a chute 111 is formed at the bottom of the driving body 11. The cross-section of the chute 111 is in a "convex" shape. The chute 111 can accommodate the slider 12. A driving assembly is arranged inside the driving body 11. The driving assembly is connected to the slider 12 and can drive the slider 12 to slide in the chute 111. In this embodiment, the shape of the slider 12 is suitable for sliding in the chute 111. The slider 12 is arranged in a long strip shape, and the length of the slider 12 is less than the length of the chute 111. The top of the first jaw 21 is connected to one of the sliders 12, and the top of the second jaw 22 is connected to the other slider 12. As the two sliders 12 slide relatively synchronously, the first jaw 21 and the second jaw 22 can approach or move away from each other, so that the first finger 211 and the second finger 221 can cooperate with each other to complete the actions of clamping, transporting, and placing the piston 200.
[0051] Furthermore, in an embodiment of the present invention, two chutes 111 are formed at the bottom of the driving body 11. The two chutes 111 are arranged in parallel. The two sliders 12 are arranged in one-to-one correspondence with the two chutes 111. By arranging two parallel chutes 111, the two sliders 12 can slide in their respective corresponding chutes 111, avoiding interference between the two sliders 12, making the stroke of the slider 12 longer, so that the opening and closing range between the first finger 211 and the second finger 221 is larger, and finally making the applicability of the clamping device 100 higher, and it can clamp more pistons 200 of different models.
[0052] In addition, in an embodiment of the present invention, the first jaw 21 is detachably connected to one of the sliders 12, and the second jaw 22 is detachably connected to the other slider 12. Specifically, the first jaw 21 is connected to its corresponding slider 12 by screws, and the second jaw 22 is connected to its corresponding slider 12 by screws. It should be noted that there are various models of the piston 200. When the strokes of the first jaw 21 and the second jaw 22 do not satisfy the requirement for the rotating chuck 4 to grasp a certain model of the piston 200, it is necessary to replace the first jaw 21 and the second jaw 22 with smaller or larger sizes. By setting the first jaw 21 and the second jaw 22 and their corresponding sliders 12 in a detachable connection manner, different-sized first jaws 21 and second jaws 22 can be replaced in time to improve the versatility of the clamping device 100.
[0053] The above is only an exemplary embodiment of the present invention, and it does not limit the patent scope of the present invention accordingly. All equivalent structural transformations made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.
Claims
1. A clamping device, characterized in that, Comprising: A driving member; A clamping member, the clamping member being mounted on the driving member, the clamping member including a first jaw and a second jaw, the driving member being configured to drive the first jaw and the second jaw to move away from or close to each other, the first jaw including at least two first finger members, the second jaw including at least two second finger members, the first finger members and the second finger members being disposed opposite to each other; A plurality of limiting rods, each of the first finger members being provided with an independent limiting rod, and each of the second finger members being provided with an independent limiting rod; A rotating chuck, the rotating chuck being sleeved on the limiting rod, and the rotating chuck being capable of freely rotating around the limiting rod.
2. The clamping device according to claim 1, characterized in that, The rotating chuck includes a main body and an annular protrusion provided on the outer peripheral surface of the main body, the main body being of a cylindrical structure, the number of the annular protrusions being at least one, and at least one of the annular protrusions being coaxially arranged with the main body.
3. The clamping device according to claim 2, characterized in that, The number of the annular protrusions is at least two, at least two of the annular protrusions being spaced apart along the axial direction of the main body, and an anti-slip rubber sleeve being sleeved on the outer surface of the annular protrusion.
4. The clamping device according to claim 1, characterized in that The clamping device further includes an elastic rubber layer, the elastic rubber layer being disposed annularly on the outer peripheral surface of the rotating chuck.
5. The clamping device according to claim 1, characterized in that, The limiting rod includes a threaded portion, a mounting portion and a limiting portion; The threaded portion is mounted at the bottom of the first finger member, or, The threaded portion is mounted at the bottom of the second finger member; The rotating chuck is sleeved on the outside of the mounting portion, and the limiting portion is provided at the bottom end of the mounting portion to prevent the rotating chuck from falling off.
6. The clamping device according to claim 5, wherein, The threaded portion can rotate and extend or retract into the first finger member, or, The threaded portion can rotate and extend or retract into the second finger member.
7. The clamping device according to claim 1, characterized in that The first finger member and the second finger member are symmetrically arranged.
8. The clamping device according to claim 1, wherein The driving member includes a driving main body and two sliders, a chute being formed at the bottom of the driving main body, and the sliders being slidably disposed in the chute; The top of the first jaw is connected to one of the sliders, and the top of the second jaw is connected to the other slider.
9. The clamping device according to claim 8, wherein Two chutes are formed at the bottom of the driving main body, the two chutes being arranged in parallel with each other, and the two sliders being arranged in one-to-one correspondence with the two chutes.
10. The clamping device according to claim 8, wherein, The first jaw is detachably connected to one of the sliders, and the second jaw is detachably connected to the other slider.