A clamping device for small cylindrical workpieces

Abstract

This invention proposes a clamping device for small cylindrical workpieces, comprising a mounting frame on which a push-pull plate is movably mounted via a driving component; a pair of triangular swing arms, mirror-symmetrically arranged on both sides of the lower part of the push-pull plate, with the first end of each arm rotatably connected to the plate via a first shaft, and the middle end of each arm facing outward and rotatably connected to the mounting frame via a second shaft; and a pair of clamping arms, mirror-arranged below the swing arms and perpendicular to the mounting frame, capable of left-right displacement relative to the mounting frame, with the movement trajectory fixed in the horizontal direction of the mounting frame. One side of each clamping arm extends upward and is rotatably connected to the second end of each swing arm via a third shaft. This invention forms a highly reliable, low-maintenance, and easily integrated clamping device, solving the problems of centering accuracy and structural compactness in clamping small cylindrical workpieces.

Description

Technical Field

[0001] This utility model relates to the field of workpiece clamping technology, specifically, it demonstrates a clamping device for a small cylindrical workpiece. Background Technology

[0002] When machining cylindrical workpieces, a clamp is usually used to hold and fix the cylindrical workpiece to ensure the machining accuracy and quality.

[0003] Current clamping fixtures either use threaded connections for clamping and fixing, but this is complicated to operate and requires manual rotation of the threads; or they use pneumatic fingers or linear guides to drive the grippers, but when the cylinder directly pushes the grippers, the workpiece is subject to unbalanced force and is prone to tilting, and in severe cases, it may not be able to be gripped stably, which may lead to problems such as loosening or slipping of the workpiece. Therefore, this utility model provides a clamping device suitable for small cylindrical workpieces. Utility Model Content

[0004] The purpose of this invention is to provide a clamping device for small cylindrical workpieces that saves time and effort and has a good clamping effect.

[0005] The technical solution is as follows:

[0006] A clamping device for a small cylindrical workpiece, comprising:

[0007] The mounting frame has a push-pull plate that can be movably mounted on it via a drive mechanism, and the drive mechanism enables the push-pull plate to move up and down relative to the mounting frame.

[0008] A pair of triangular swing arms are mirror-symmetrically arranged on both sides of the lower part of the push-pull plate. The first end of the triangular swing arm is rotatably connected to the push-pull plate through the No. 1 shaft, and the middle end of the triangular swing arm faces outward and is rotatably connected to the mounting frame through the No. 2 shaft.

[0009] A pair of clamping arms are positioned mirror-image below the triangular swing arm and perpendicular to the mounting frame. Their inner walls have clamping end faces. The clamping arms can move left and right relative to the mounting frame. The movement trajectory of the clamping arms is fixed in the horizontal direction of the mounting frame. One side of the clamping arm extends upward and is rotatably connected to the second end of the triangular swing arm through a third shaft.

[0010] In addition, the above embodiments of this utility model may also have the following additional technical features:

[0011] According to one embodiment of this utility model, it further includes a first extension plate and a second extension plate respectively disposed on the mounting frame and the push-pull plate. A vertical shaft is disposed on the first extension plate, the top of the shaft movably passes through the second extension plate, and a spring is sleeved on the outside of the shaft. The elastic pressure of the spring can suppress the return impact of the drive component and reduce device vibration.

[0012] Both the first and second extension plates are provided with gaskets for contacting the ends of the spring. The gaskets have higher wear resistance than the plates, reducing wear on the contact surface with the spring and maintaining cushioning stability.

[0013] According to one embodiment of this utility model, the clamping end face of the clamping arm is configured as a V-groove or a circular arc groove. This adapts to workpieces of different diameters and can automatically center, improving the clamping effect.

[0014] The clamping arm also features an anti-slip layer on its clamping end face. This increases the coefficient of friction on the clamping end face, preventing the workpiece from rotating or slipping.

[0015] According to one embodiment of this utility model, a horizontal guide rail is provided on the mounting frame, and two sliders are slidably mounted on the guide rail in a snap-fit ​​manner. The two sliders are respectively connected to the two clamping arms. The cooperation between the guide rail and the sliders can constrain the clamping arms to perform purely horizontal movements, eliminating the swaying of the clamping arms during movement.

[0016] The clamping arm has an upwardly extending hinge at its end for rotatable connection with the third shaft. The hinge is integrally formed with the clamping arm to reduce assembly errors.

[0017] According to one embodiment of this utility model, the driving component is a slide module, and the push-pull plate is connected to the slide of the slide module. The slide module is used to precisely control the push-pull stroke, providing flexible clamping.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: the driving component can provide sufficient clamping force through the lever mechanism (triangular swing arm), and it is adjustable. The triangular swing arm cleverly realizes the conversion of motion direction and form; the pure horizontal motion constraint of the clamping arm ensures the consistency of clamping and the positioning accuracy of the workpiece, which is very suitable for small cylindrical workpieces. The symmetrical design allows the clamping arms on both sides to move towards or away from the center at the same distance, realizing self-centering clamping. Finally, a set of highly reliable, low-maintenance, and easy-to-integrate clamping devices is formed, which solves the problems of centering accuracy and structural compactness in clamping small cylindrical workpieces. Attached Figure Description

[0019] Figure 1 This is an overall schematic diagram of a clamping device for a small cylindrical workpiece according to an embodiment of the present invention;

[0020] Figure 2 for Figure 1 Front view diagram;

[0021] Figure 3 This is a schematic diagram of the clamping arm portion in an embodiment of the present invention;

[0022] The relevant markings in the attached diagram are as follows: 1-Mounting frame, 2-Push-pull plate, 3-Drive component, 4-Triangular swing arm, 5-Clamping arm, 6-First extension plate, 7-Second extension plate, 8-Shaft, 11-Guide rail, 12-Slider, 41-Shaft No. 1, 42-Shaft No. 2, 43-Shaft No. 3, 51-Clamping end face, 52-Hinge, 81-Spring component, 82-Washer body. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Reference Figure 1 , Figure 2 , Figure 3 As shown in the figure, this utility model embodiment proposes a clamping device for small cylindrical workpieces, mainly for clamping small cylindrical workpieces. The clamping device mainly includes a mounting frame 1, a push-pull plate 2, a pair of triangular swing arms 4, and a pair of clamping arms 5. The mounting frame 1 provides a rigid support base to ensure stable support. It has a horizontal support surface and a vertical mounting surface. The push-pull plate 2 is movably mounted on the vertical mounting surface of the mounting frame 1 by a driving component 3. The driving component 3 realizes the vertical displacement movement of the push-pull plate 2 relative to the mounting frame 1. That is to say, the movement direction of the push-pull plate 2 is vertical. The driving component can be a slide module (such as a lead screw / linear motor slide module). The main body of the slide module is fixed on the mounting frame, while its slide part is connected to the push-pull plate to achieve precise control of the push-pull stroke. Of course, the driving component can also be a cylinder, which is simple and direct.

[0025] Two triangular swing arms 4 are symmetrically arranged on the lower sides of the push-pull plate 2 in a mirror image, one on the left and one on the right. The first end (i.e., the upper end) of the triangular swing arm 4 is rotatably connected to the push-pull plate 2 through a first shaft 41, while the middle end (i.e., the middle) of the triangular swing arm 4 faces outward and is also rotatably connected to the push-pull plate 2 through a second shaft 42. The rotatable connection is achieved by bearing components, which are all set on the triangular swing arms. One end of the first / second shaft is tightly inserted into the bearing component to achieve the rotatable connection. It should be noted that the middle end of the triangular swing arm serves as a fixed rotation fulcrum.

[0026] Two clamping arms 5 are also mirror-shaped and positioned below the triangular swing arm 4, both perpendicular to the vertical mounting surface of the mounting frame 1. The inner front wall of the clamping arm 5 has a clamping end face 51. The clamping arm 5 can move left and right relative to the mounting frame 1, and the movement trajectory of the clamping arm 5 is fixed in the horizontal direction of the mounting frame 1. That is to say, the two clamping arms 5 can move closer to each other or further away from each other, thereby achieving clamping or releasing of the workpiece. One side of the clamping arm 5 extends upward and is rotatably connected to the second end of the triangular swing arm 4 through the third shaft 43. Similarly, one end of the third shaft is also mounted on the triangular swing arm through a bearing.

[0027] Implementation principle:

[0028] Initial state: The drive unit 3 is in the extended state, the push-pull plate 2 is in the lowest position, and at this time the first end of the triangular swing arm 4 (near the connection point of the push-pull plate) is in the lowest position.

[0029] Clamping action (drive component retraction): Drive component 3 retracts upward, pulling the push-pull plate 2 upward. Since the first end of the triangular swing arm 4 is rotatably connected to the push-pull plate 2 through the first shaft 41, the upward movement of the push-pull plate 2 will drive the first end of the triangular swing arm 4 to move upward together. The middle end of the triangular swing arm 4 is fixed to the mounting frame 1 through the second shaft 42. This point acts as the rotation fulcrum (or pivot) of the triangular swing arm 4. When the first end of the triangular swing arm 4 is lifted upward, and its fulcrum (middle end) position is fixed, according to the lever principle, the second end (far end) of the triangular swing arm 4 will swing inward (towards the center line of the device) around the fulcrum (second shaft).

[0030] The upper end of the clamping arm 5 is connected to the second end of the triangular swing arm 4 via the third shaft 43. Therefore, the inward swing of the second end of the triangular swing arm 4 will force the clamping arm 5 to move inward. Since the clamping arm 5 is constrained on the mounting frame 1, it can only move horizontally left and right (the movement trajectory is fixed in the horizontal direction). When the upper end of the clamping arm 5 is pulled inward, the entire clamping arm 5 will move horizontally inward (closer to each other).

[0031] 3. Release action (drive unit extends again): Drive unit 3 extends, pushing the push-pull plate 2 downward. The downward movement of the push-pull plate 2 causes the first end of the triangular swing arm 4 to move downward together. The first end of the triangular swing arm 4 moves downward and rotates around the fixed fulcrum (the second axis). The second end of the triangular swing arm 4 then swings outward (away from the center line of the device). The outward swing of the second end of the triangular swing arm 4 will push the upper end of the clamping arm 5 to move outward. Therefore, the clamping arms 5 are forced to move horizontally outward (away from each other). The two clamping arms 5 separate and release the workpiece.

[0032] In some embodiments of this application, a first extension plate 6 and a second extension plate 7 are respectively disposed on the mounting frame 1 and the push-pull plate 2. A vertical shaft 8 is disposed on the first extension plate 6, and the top of the shaft 8 can movably pass through the second extension plate 7. A spring member 81 is sleeved on the outside of the shaft 8. The elastic pressure of the spring member can suppress the return impact of the drive member and reduce the vibration of the device. Moreover, the first extension plate is also located directly below the push-pull plate, which can also provide overload protection for the push-pull plate to a certain extent and prevent the push-pull plate from moving too far downward.

[0033] Both the first extension plate 6 and the second extension plate 7 are provided with a gasket 82 for contacting the end of the spring member 81. The gasket has higher wear resistance than the plate, which reduces wear on the contact surface with the spring and maintains buffer stability.

[0034] It should be noted that the clamping end face 51 of the clamping arm 5 can be set as a V-shaped groove or a circular arc groove. The V-shaped groove is suitable for workpieces of different diameters and can automatically center, improving the clamping effect. The circular arc groove fits the curved surface of the cylindrical workpiece, which can disperse the clamping force and avoid indentation damage.

[0035] It should also be noted that an anti-slip layer (not shown) is provided on the clamping end face 51 of the clamping arm 5, such as an elastic rubber layer, to increase the friction coefficient between the clamping end face and the workpiece, prevent the workpiece from rotating or slipping, and to a certain extent, it can also play a buffering and shock-absorbing role, protecting the outer surface of the workpiece.

[0036] In some embodiments of this application, a horizontal guide rail 11 is provided on the mounting frame 1, and two sliders 12 are slidably disposed on the guide rail 11 in a snap-fit ​​manner. The two sliders 12 are respectively connected to two clamping arms 5. The cooperation between the guide rail and the sliders can constrain the clamping arms to make purely horizontal movements and eliminate the swaying when the clamping arms move.

[0037] It should be noted that the end of the clamping arm 5 has an upwardly extending hinge portion 52 for rotatably connecting with the No. 3 shaft 43. The hinge portion is integrally formed with the clamping arm, which can reduce assembly errors.

[0038] The clamping device provided in this application mainly converts the vertical movement of the driving component into the horizontal clamping of the clamping arm, thereby achieving a flexible clamping effect on small cylindrical workpieces.

[0039] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A clamping device for a small cylindrical workpiece, characterized in that, include: The mounting frame (1) has a push-pull plate (2) movably mounted on it via a drive component (3), and the drive component (3) enables the push-pull plate (2) to move up and down relative to the mounting frame (1). A pair of triangular swing arms (4) are mirror-symmetrically arranged on both sides of the lower part of the push-pull plate (2). The first end of the triangular swing arm (4) is rotatably connected to the push-pull plate (2) through the first shaft (41), and the middle end of the triangular swing arm (4) faces outward and is rotatably connected to the mounting frame (1) through the second shaft (42). A pair of clamping arms (5) are mirror-positioned below the triangular swing arm (4) and perpendicular to the mounting frame (1). Their inner walls have clamping end faces (51). The clamping arms (5) can move left and right relative to the mounting frame (1). The movement trajectory of the clamping arms (5) is fixed in the horizontal direction of the mounting frame (1). One side of the clamping arm (5) extends upward and is rotatably connected to the second end of the triangular swing arm (4) through a third shaft (43).

2. The clamping device for a small cylindrical workpiece according to claim 1, characterized in that, It also includes a first extension plate (6) and a second extension plate (7) respectively disposed on the mounting frame (1) and the push-pull plate (2). A vertical shaft (8) is disposed on the first extension plate (6), the top of the shaft (8) is movably connected through the second extension plate (7), and a spring (81) is sleeved on the outside of the shaft (8).

3. The clamping device for a small cylindrical workpiece according to claim 2, characterized in that, Both the first extension plate (6) and the second extension plate (7) are provided with a gasket (82) for contacting the end of the spring (81).

4. The clamping device for a small cylindrical workpiece according to claim 1, characterized in that, The clamping end face (51) of the clamping arm (5) is configured as a V-shaped groove or a circular arc groove.

5. The clamping device for a small cylindrical workpiece according to claim 4, characterized in that, An anti-slip layer is also provided on the clamping end face of the clamping arm (5).

6. The clamping device for a small cylindrical workpiece according to claim 1, characterized in that, The mounting frame (1) is provided with a horizontal guide rail (11), and two sliders (12) are slidably mounted on the guide rail (11) in a snap-fit ​​manner. The two sliders (12) are respectively connected to the two clamping arms (5).

7. The clamping device for a small cylindrical workpiece according to claim 6, characterized in that, The end of the clamping arm (5) has an upwardly extending hinge (52) for rotatably connecting with the third shaft (43).

8. The clamping device for a small cylindrical workpiece according to claim 1, characterized in that, The driving component (3) is a slide module, and the push-pull plate (2) is connected to the slide of the slide module.

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