A clamping device

Abstract

The present invention discloses a clamping device, comprising a plurality of clamping blocks that can move closer to or further away from each other to clamp or release a workpiece, the clamping block having a clamping surface, and the plurality of clamping surfaces enclose a clamping space, the clamping space having a center line; the clamping surface having a connecting section, and two clamping sections respectively connected to both ends of the connecting section, the minimum distance from the clamping section to the center line being smaller than the minimum distance from the connecting section to the center line. In the present invention, the distance from the two clamping sections to the center line is smaller than the distance from the connecting section, so that the two clamping sections are in direct contact with the workpiece surface and provide a clamping force. In this way, the original solution of clamping the workpiece by fitting the clamping surface to the workpiece surface can be replaced, solving the problem that the clamping surface cannot fit with the workpiece surface and thus cannot clamp due to the irregularity of the workpiece surface.

Description

Technical Field

[0001] The present invention relates to the technical field of clamps, and in particular to a clamping device. Background Art

[0002] During the machining process of tubular workpieces such as bearings, the workpieces need to be clamped. Generally, the arc surfaces of multiple clamping blocks are in contact with the workpiece surface and force is applied to the workpiece to achieve clamping.

[0003] As described in the patent document with publication number "CN209256764U" and patent name "A clamping device for a shaft member", it includes a chuck having a plurality of clamping petals with arc-shaped cross-sections elastically connected to each other, each clamping petal having a first end facing the clamped shaft member and a second end away from the clamped shaft member in the axial direction, wherein each clamping petal of the chuck has a first clamping portion and a second clamping portion extending toward the inner diameter, and the radial extension length of the first clamping portion is smaller than the radial extension length of the second clamping portion.

[0004] In the above solution, the curved surfaces of the first and second clamping parts mate with the workpiece, thereby achieving surface contact between the clamping parts and the workpiece. However, in the rough stage, tubular workpieces such as bearings have not yet undergone grinding and polishing. The side surfaces of the bearings are not standard arcs but rather irregular shapes. This prevents the clamping parts from mate with the bearing sides, ultimately rendering the fixture unable to provide stable clamping. This can lead to the workpiece becoming loose or even falling off during machining. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to propose a clamping device for solving the problems in the prior art where the irregular surface of the workpiece causes the fixture to be unable to fit with the workpiece surface, thereby causing the workpiece to loosen or even fall off.

[0006] The technical solution adopted by the present invention to solve its technical problem is a clamping device comprising a plurality of clamping blocks that can move closer to or farther away from each other to clamp or release a workpiece, wherein the clamping block has a clamping surface, and the plurality of clamping surfaces together form a clamping space, wherein the clamping space has a center line;

[0007] The clamping surface has a connecting section and two clamping sections respectively connected to both ends of the connecting section. The minimum distance between the clamping section and the center line is smaller than the minimum distance between the connecting section and the center line.

[0008] Furthermore, the connecting section is arranged in an arc shape, and the clamping section is located on the inner side of the arc surface where the connecting section is located.

[0009] Furthermore, the minimum distance between the clamping section and the center line gradually increases or decreases from the middle to both ends.

[0010] Furthermore, the clamping section is a curved surface or is composed of at least two planes connected in sequence.

[0011] Furthermore, the two clamping sections are symmetrical about the midpoint of the connecting section.

[0012] Furthermore, it includes a shrinking cylinder, the shrinking cylinder includes a plurality of elastic blocks, the elastic blocks have a first connecting end and a second connecting end opposite to each other, the plurality of the first connecting ends are fixedly connected to a circular ring, each of the second connecting ends is fixedly connected to a driving block, and a clamping block is provided on the inner side of each of the driving blocks;

[0013] There is a first gap between any two driving blocks, a second gap between any two adjacent elastic blocks, and the multiple elastic blocks are configured to be bendable so that the multiple driving blocks drive the multiple clamping blocks to move closer to or away from each other.

[0014] Furthermore, the clamping block is arranged in a fan ring shape;

[0015] A third gap is defined between the inner surface of the driving block and the outer surface of the clamping block, and a size of the third gap gradually increases from the middle to both ends.

[0016] Furthermore, the middle portion of the outer surface of the clamping block abuts against the outer surface of the driving block;

[0017] Two springs are arranged between the clamping block and the driving block, and the two springs are symmetrical about the middle of the clamping block.

[0018] Furthermore, it also includes a drive ring provided on the outer periphery of the shrinking tube, wherein the drive ring can slide axially relative to the shrinking tube;

[0019] A first inclined surface is provided on the inner side of the driving ring, and a second inclined surface is provided on the outer side of the driving block, wherein the second inclined surface abuts against the first inclined surface.

[0020] Furthermore, both the first inclined surface and the second inclined surface are gradually inclined from the first connection end toward the second connection end toward a direction away from the center line.

[0021] Compared with the prior art, the present invention has at least the following beneficial effects:

[0022] (1) The workpiece is placed in the clamping space between the multiple clamping blocks, and the multiple clamping surfaces are brought close to each other to clamp the workpiece. Since the distance between the two clamping segments and the centerline is less than the distance between the connecting segment and the centerline, the two clamping segments directly contact the workpiece surface and provide clamping force. This replaces the existing solution of clamping the workpiece by fitting the clamping surface to the workpiece surface, solving the problem of the workpiece surface being unable to fit the clamping surface and thus being unable to clamp due to irregularities in the workpiece surface.

[0023] (2) There is a third gap between the driving block and the clamping block, so that when the driving blocks approach each other, the clamping block can swing at a certain angle relative to the driving block, thereby enabling the two clamping sections to better fit the shape and curvature of the workpiece surface, thereby achieving more stable clamping and being able to clamp workpieces of more shapes. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the structure of the clamping device in the embodiment;

[0025] Figure 2 Schematic diagram of the structure of the shrinking cylinder, the clamping block and the workpiece in the embodiment;

[0026] Figure 3 A side view of the shrinking cylinder, the clamping block and the workpiece in the embodiment;

[0027] Figure 4 for Figure 3 A partial enlarged view of point A in the middle;

[0028] Figure 5 Schematic diagram of the structure of the clamping block in the embodiment;

[0029] Figure 6 Schematic diagram of the structure of the shrink tube in the embodiment;

[0030] Figure 7 Schematic diagram of the structure of the drive ring in the embodiment;

[0031] In the picture:

[0032] 100, clamping block; 110, clamping space; 120, clamping surface; 121, connecting section; 122, clamping section;

[0033] 200, shrinking cylinder; 210, elastic block; 211, second gap; 220, ring; 230, driving block; 231, second inclined surface; 232, first gap; 233, third gap;

[0034] 300, driving ring; 310, first inclined surface;

[0035] 400. Workpiece. DETAILED DESCRIPTION

[0036] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0037] Please refer to Figure 1-Figure 7 The present invention discloses a clamping device, comprising a plurality of clamping blocks 100 that can move closer to or farther from each other to clamp or release a workpiece 400, wherein the clamping block 100 has a clamping surface 120, and the plurality of clamping surfaces 120 together form a clamping space 110, wherein the clamping space 110 has a center line;

[0038] The clamping surface 120 has a connecting section 121 and two clamping sections 122 connected to both ends of the connecting section 121 respectively. The minimum distance between the clamping section 122 and the center line is smaller than the minimum distance between the connecting section 121 and the center line.

[0039] The present application divides the clamping surface 120 into a connecting section 121 and two clamping sections 122 connected to both ends of the connecting section 121. The distance between the two clamping sections 122 and the center line is smaller than the distance between the connecting section 121 and the center line. When clamping the workpiece 400, the connecting section 121 does not contact the surface of the workpiece 400, and the two clamping sections 122 contact the surface of the workpiece 400 and provide a force to achieve clamping of the workpiece 400.

[0040] Specifically, the workpiece 400 is placed in the clamping space 110 between the multiple clamping blocks 100, and the multiple clamping surfaces 120 are brought together to clamp the workpiece 400. Because the distance between the two clamping segments 122 and the centerline is shorter than the distance between the connecting segment 121 and the centerline, the two clamping segments 122 directly contact the surface of the workpiece 400 and provide clamping force. This replaces the existing method of clamping the workpiece 400 by contacting the clamping surfaces 120 with the surface of the workpiece 400, resolving the problem of the clamping surface 120 not being able to contact the workpiece 400 due to irregularities in the workpiece 400 surface, thus preventing the workpiece 400 from being clamped.

[0041] It should be noted that this application is directed to workpieces 400, such as bearings, which, in their blank state, are generally cylindrical (but not perfectly circular, with varying curvatures at various locations on their side surfaces, or with protrusions and depressions). Therefore, the minimum distance from the clamping segment 122 to the centerline is smaller than the distance from the connecting segment 121 to the centerline. This can be understood as the minimum distance from the clamping segment 122 to the surface of the workpiece 400 being smaller than the distance from the connecting segment 121 to the surface of the workpiece 400, thereby ensuring that both clamping segments 122 can contact the surface of the workpiece 400 and provide clamping force.

[0042] Furthermore, the connecting section 121 is arranged in an arc shape, and the clamping section 122 is located on the inner side of the arc surface where the connecting section 121 is located. The inner side of the arc surface refers to the side having the center of the circle.

[0043] The connecting section 121 is configured to be in an arc shape for ease of processing; at the same time, the force from the clamping sections 122 at both ends can be dispersed at various positions of the connecting section 121, making the force at various positions of the connecting section 121 more uniform.

[0044] Furthermore, the minimum distance between the clamping section 122 and the center line gradually increases or decreases from the middle to both ends.

[0045] Specifically, the clamping section 122 is set to gradually tilt outward from the middle to both ends. When clamping different workpieces 400, different positions on the clamping section 122 can be made to contact the workpiece 400 according to the different shapes and curvatures of the surface of the workpiece 400, thereby being able to clamp more workpieces 400 with different surface curvatures.

[0046] Furthermore, the clamping section 122 is a curved surface or is composed of at least two planes connected in sequence.

[0047] If the clamping section 122 is a curved surface, the curved surface has a separation line closest to the centerline, and the separation line is located in the middle of the curved surface. The distance from the curved surface to the centerline gradually increases from the separation line to the ends. If the clamping section 122 is two flat surfaces, the distance from the intersection of the two flat surfaces to the centerline is the smallest, and the distance from the clamping section 122 to the centerline gradually increases from the intersection to the ends.

[0048] Furthermore, the two clamping sections 122 are symmetrical about the midpoint of the connecting section 121 .

[0049] The two clamping sections 122 are symmetrical about the midpoint of the connecting section 121 , so that the forces exerted by the two clamping sections 122 on the surface of the workpiece 400 are closer, enabling more stable clamping.

[0050] Furthermore, the invention further comprises a shrinking tube 200, wherein the shrinking tube 200 comprises a plurality of elastic blocks 210, wherein the elastic blocks 210 have a first connecting end and a second connecting end opposite to each other, wherein the plurality of first connecting ends are fixedly connected to a ring 220, and each second connecting end is fixedly connected to a driving block 230, and each driving block 230 is provided with a clamping block 100 on its inner side;

[0051] There is a first gap 232 between any two driving blocks 230, and a second gap 211 between any two adjacent elastic blocks 210, and the multiple elastic blocks 210 are configured to be bendable so that the multiple driving blocks 230 drive the multiple clamping blocks 100 to move closer to or away from each other.

[0052] Specifically, the elastic block 210 on the shrinking tube 200 can bend, thereby causing the multiple driving blocks 230 at the second connecting end to move closer to or farther away from each other, thereby driving the multiple clamping blocks 100 to move closer to or farther away from each other, thereby clamping the workpiece 400.

[0053] During the process of moving closer to each other, the first gap 232 and the second gap 211 decrease; during the process of moving away from each other, the first gap 232 and the second gap 211 increase. The first gap 232 and the second gap 211 are provided to facilitate the bending of the elastic block 210 so that it has deformation space.

[0054] Furthermore, the clamping block 100 is arranged in a fan ring shape; wherein, the clamping block 100 is a fan ring with an angle of 90°, and a total of four clamping blocks 100 are arranged.

[0055] A third gap 233 is defined between the inner surface of the driving block 230 and the outer surface of the clamping block 100 , and the size of the third gap 233 gradually increases from the middle to both ends.

[0056] Specifically, there is a third gap 233 between the driving block 230 and the clamping block 100, so that when the driving blocks 230 approach each other, the clamping block 100 can swing a certain angle relative to the driving block 230, thereby enabling the two clamping sections 122 to better fit the shape and curvature of the surface of the workpiece 400 to achieve more stable clamping.

[0057] Furthermore, the middle portion of the outer surface of the clamping block 100 abuts against the outer surface of the driving block 230;

[0058] Two springs are provided between the clamping block 100 and the driving block 230 , and the two springs are symmetrical about the middle of the clamping block 100 .

[0059] Specifically, there is a contact position between the clamping block 100 and the driving block 230. In the process of multiple clamping blocks 100 clamping the workpiece 400, one of the clamping segments 122 first contacts the surface of the workpiece 400, and then the clamping block 100 rotates a certain angle relative to the driving block 230; during the rotation process, one of the springs is compressed and the other spring is stretched, and at the same time, the contact position with the driving block 230 is changed until the other clamping segment 122 also contacts the workpiece 400, so that the two clamping segments 122 can abut against the workpiece 400 at the same time and achieve clamping of the workpiece 400.

[0060] That is, the clamping block 100 has a certain rotation angle, so that the two clamping segments 122 on each clamping block 100 always keep in contact with the workpiece 400, so as to clamp workpieces 400 of more shapes, such as elliptical bearings.

[0061] Furthermore, it further comprises a driving ring 300 provided on the outer periphery of the shrinking tube 200, and the driving ring 300 can slide axially relative to the shrinking tube 200;

[0062] A first inclined surface 310 is provided on the inner side of the driving ring 300 , and a second inclined surface 231 is provided on the outer side of the driving block 230 . The second inclined surface 231 abuts against the first inclined surface 310 .

[0063] Furthermore, both the first inclined surface 310 and the second inclined surface 231 are gradually inclined from the first connection end toward the second connection end toward a direction away from the center line.

[0064] Specifically, the drive ring 300 can be moved from the first connection end toward the second connection end relative to the shrinking tube 200, so that the first inclined surface 310 is pressed against the second inclined surface 231 and drives the multiple drive blocks 230 to squeeze the multiple clamping blocks 100 closer to each other to achieve clamping of the workpiece 400; similarly, the drive ring 300 moves in the opposite direction to achieve the release of the workpiece 400.

[0065] The shrinking tube 200 can also be moved from the second connection end toward the first connection end relative to the drive ring 300, and the second inclined surface 231 moves inward under the action of the first inclined surface 310, thereby driving the drive block 230 to squeeze the clamping block 100, so that multiple clamping blocks 100 move inward and clamp the workpiece 400; similarly, the shrinking tube 200 can release the workpiece 400 by moving in the opposite direction.

[0066] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0067] In addition, in the present invention, descriptions such as "first," "second," and "one" are for descriptive purposes only and should not be understood to indicate or imply their relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0068] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0069] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A clamping device, characterized in that: The invention comprises a plurality of clamping blocks which can move closer to or farther from each other to clamp or release a workpiece, wherein the clamping blocks have a clamping surface, and the plurality of clamping surfaces together form a clamping space, and the clamping space has a center line; The clamping surface has a connecting section and two clamping sections connected to both ends of the connecting section respectively, and the minimum distance between the clamping section and the center line is smaller than the minimum distance between the connecting section and the center line; The invention also includes a shrinking cylinder, the shrinking cylinder including a plurality of elastic blocks, the elastic blocks having a first connecting end and a second connecting end opposite to each other, the plurality of first connecting ends being fixedly connected to a circular ring, each of the second connecting ends being fixedly connected to a driving block, and a clamping block being provided on the inner side of each of the driving blocks; The clamping block is arranged in a fan ring shape; A third gap is defined between the inner surface of the driving block and the outer surface of the clamping block, and the size of the third gap gradually increases from the middle to both ends; The middle portion of the outer surface of the clamping block abuts against the outer surface of the driving block; Two springs are arranged between the clamping block and the driving block, and the two springs are symmetrical about the middle of the clamping block.

2. A clamping device according to claim 1, characterized in that: The connecting section is arranged in an arc shape, and the clamping section is located on the inner side of the arc surface where the connecting section is located.

3. A clamping device according to claim 1, characterized in that: The minimum distance between the clamping section and the center line gradually increases from the middle to both ends.

4. A clamping device according to claim 3, characterized in that: The clamping section is an arc surface or is composed of at least two planes connected in sequence.

5. The clamping device according to claim 1, characterized in that: The two clamping sections are symmetrical about the midpoint of the connecting section.

6. A clamping device according to any one of claims 1 to 5, characterized in that: There is a first gap between any two driving blocks, a second gap between any two adjacent elastic blocks, and the multiple elastic blocks are configured to be bendable so that the multiple driving blocks drive the multiple clamping blocks to move closer to or away from each other.

7. The clamping device according to claim 1, characterized in that: It also includes a drive ring arranged on the outer periphery of the shrinking tube, and the drive ring can slide axially relative to the shrinking tube; A first inclined surface is provided on the inner side of the driving ring, and a second inclined surface is provided on the outer side of the driving block, wherein the second inclined surface abuts against the first inclined surface.

8. A clamping device according to claim 7, characterized in that: The first inclined surface and the second inclined surface are both inclined gradually away from the center line from the first connection end toward the second connection end.

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