A clamping fixture

Abstract

The utility model relates to the technical field of grinding equipment, and provides a clamping tool, including a bracket, a clamping assembly and a driving member, a first through hole and a second through hole are arranged on the first side of the bracket, the first through hole and the second through hole penetrate the bracket and intersect at the second side; the clamping assembly includes a tilting rod, a pull rod and a spring chuck, the middle axis of the tilting rod is hingedly arranged in the first through hole, the fixed end of the spring chuck is arranged in the second through hole, the spring chuck is provided with a core hole connecting the two ends, the pull rod is sleeved in the core hole, and one end of the pull rod is hingedly arranged with one end axis of the tilting rod; an expansion chuck is arranged at the other end of the spring chuck, a limiting portion abutting against the bracket is arranged on the spring chuck, and a protrusion for radially expanding or contracting the expansion chuck is arranged at the other end of the pull rod; and a driving member for driving the tilting rod to swing around the hinge axis. The clamping points of the expansion chuck are evenly distributed on the inner hole of the tubular workpiece, the positioning of the tubular workpiece will not be offset, and grinding without dead angles is possible.

Description

Technical Field

[0001] The utility model relates to the technical field of grinding equipment, in particular to a clamping tool. Background Art

[0002] During the processing of tubular workpieces, it is usually necessary to grind and polish their outer surfaces. For tubular workpieces with complex shapes, the tubular workpieces need to be rotated at multiple angles and directions during the grinding process in order to grind them evenly and completely. Therefore, people set a clamping tool on the robot to clamp the tubular workpiece, and use the robot to control the clamping tool to rotate the tubular workpiece to complete the automated grinding of the tubular workpiece.

[0003] However, the existing clamping tooling generally adopts the form of clamping the outer surface of the tubular workpiece, such as the utility model patent with application number CN202222077137.X and the name of "A surface polishing device for manipulator processing", which uses two clamping arms to approach each other to clamp the workpiece and move away from each other to release the workpiece, that is, the clamping arms clamp the outer surface of the workpiece to achieve the grasping and grinding of the workpiece. However, the clamping arms have a contact portion with the outer surface of the workpiece, and the clamping arms block the contact portion, making it impossible to fully grind the workpiece, and in order to avoid the clamping arms during the grinding process, the grinding effect will be affected. Utility Model Content

[0004] The utility model aims to provide a clamping tool, aiming to improve the problem that the existing clamping tool has a poor grinding effect when used in conjunction with a tubular workpiece.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A clamping tool, comprising:

[0007] A bracket, comprising a first side surface and a second side surface arranged opposite to each other, wherein a first through hole and a second through hole are arranged on the first side surface, and the first through hole and the second through hole penetrate the bracket and intersect at the second side surface;

[0008] A clamping assembly, comprising a tilting rod, a pulling rod and a spring chuck, wherein the middle axis of the tilting rod is hingedly arranged in the first through hole, the fixed end of the spring chuck is arranged in the second through hole, the spring chuck is provided with a core hole connecting the two ends, the pulling rod is sleeved in the core hole, and one end of the pulling rod is hingedly arranged with one end axis of the tilting rod;

[0009] The other end of the spring chuck is provided with an expansion chuck, the spring chuck is provided with a limiting portion abutting against the bracket, the limiting portion is located between the expansion chuck and the fixed end, and the other end of the pull rod is provided with a protrusion for radially expanding or contracting the expansion chuck; and

[0010] A driving member is arranged on the bracket, and an output end of the driving member is arranged on the other end of the tilting rod, driving the tilting rod to swing back and forth around the hinge axis.

[0011] Preferably, the axis of the second through hole forms an angle of 0° to 90° with the horizontal plane.

[0012] Preferably, a plurality of spacing holes are arranged in a circumferential array on the expansion chuck, and the spacing holes extend from one end of the expansion chuck to the other end of the expansion chuck.

[0013] Preferably, a circular hole is provided at one end of the spacing hole close to the limiting portion.

[0014] Preferably, a plurality of reinforcing protrusions are provided on the expansion chuck, and the reinforcing protrusions are located between two adjacent spacing holes.

[0015] Preferably, the core hole includes a first core hole and a second core hole which are connected to each other, the diameter of the first core hole gradually increases toward one end of the expansion chuck, and the diameter of the second core hole is loosely matched with the diameter of the pull rod; the diameter of the raised portion is smaller than the maximum diameter of the first core hole, and the diameter of the raised portion is larger than the diameter of the second core hole.

[0016] Preferably, the side wall of the protrusion is provided with a first arc surface, and the side wall of the first core hole is provided with a second arc surface matched with the first arc surface.

[0017] Preferably, an adapter is provided at one end of the pull rod, the adapter is hinged to the tilting rod shaft, and the diameter of the adapter is larger than the diameter of the pull rod.

[0018] Preferably, it further comprises a connecting portion, the connecting portion comprising a first flange and a second flange, the second flange is sleeved outside the first flange, an inwardly recessed clamping groove is provided in the middle of the first flange, and one end of the bracket is vertically arranged on the clamping groove;

[0019] The first flange is provided with a plurality of connection holes, and the second flange is provided with a plurality of mounting holes.

[0020] Preferably, the driving member is a cylinder, the output end of the driving member is the rod end of the cylinder, and the rod end of the cylinder is hinged to the strip hole at the other end of the tilting rod through a pin.

[0021] After adopting the above technical solution, the utility model has the following advantages compared with the background technology:

[0022] 1. The expansion chuck can be radially expanded so that the clamping points of the expansion chuck are evenly distributed on the inner wall of the inner hole of the tubular workpiece. The positioning of the tubular workpiece will not be offset, and the tubular workpiece can be clamped more firmly and stably, ensuring that the tubular workpiece is polished evenly without dead angles.

[0023] 2. The position where the spring chuck clamps the tubular workpiece is the inner hole of the tubular workpiece, which will not block the outer surface of the tubular workpiece and can grind the tubular workpiece without dead angles. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of the clamping tooling described in the utility model;

[0025] Figure 2 This is a disassembly schematic diagram of the clamping tooling described in the utility model;

[0026] Figure 3 It is a cross-sectional view of the connection between the bracket and the connecting part of the clamping tool described in the utility model;

[0027] Figure 4 It is a cross-sectional view of the spring chuck of the clamping tool described in the utility model;

[0028] Figure 5 It is a cross-sectional view of the clamping tool of the utility model clamping a tubular workpiece;

[0029] Figure 6 for Figure 5 A local enlarged schematic diagram of point A in the middle.

[0030] Description of reference numerals:

[0031] 1. bracket; 11. first side surface; 111. first through hole; 112. second through hole;

[0032] 12. second side surface; 13. driving member;

[0033] 2. Clamping assembly; 21. Crank rod; 211. Strip hole; 22. Pull rod; 222. Adapter;

[0034] 223, raised portion; 2231, first arc surface; 23, spring chuck; 231, fixed end;

[0035] 232, core hole; 2321, first core hole; 23211, second arc surface; 2322, second core hole;

[0036] 233, expansion chuck; 2331, spacing hole; 23311, round hole; 2332, strengthening convex block;

[0037] 234, limit part;

[0038] 3. Connecting portion; 31. First flange; 311. Connecting groove; 312. Connecting hole;

[0039] 32. second flange; 321. mounting hole;

[0040] 4. Tubular workpieces. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0042] In addition, it should be noted that the terms "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element of the present invention must have a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0043] When an element is referred to as being “fixed to” or “disposed on” or “provided on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0044] Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0045] Example

[0046] Please refer to Figure 1-Figure 6As shown, the present embodiment provides a clamping tool, including a bracket 1, a clamping assembly 2 and a driving member 13. The bracket 1 includes a first side surface 11 and a second side surface 12 that are arranged opposite to each other, and a first through hole 111 and a second through hole 112 are arranged on the first side surface 11, and the first through hole 111 and the second through hole 112 pass through the bracket 1 and intersect at the second side surface 12, that is, the first through hole 111 is connected with the second through hole 112 and an opening is formed on the second side surface 12, and the axis of the first through hole 111 and the axis of the second through hole 112 are arranged at an angle. The clamping assembly 2 includes a tilting rod 21, a pull rod 22 and a spring chuck 23. The middle axis of the tilting rod 21 is hingedly arranged in the first through hole 111, and the pull rod 22 is arranged in the second through hole 112, that is, the tilting rod 21 and the pull rod 22 are also arranged at an angle. The first through hole 111 can be a long strip through hole, so that the tilting rod 21 can swing in the first through hole 111, and one end of the pull rod 22 is hingedly arranged with one end of the tilting rod 21. When the tilting rod 21 swings, it drives the pull rod 22 to move along the spring chuck 23, so that the pull rod 22 pushes the expansion chuck 233 radially open through the protrusion 223 to expand or contract. The tubular workpiece 4 can be clamped by expansion, and on the contrary, it is released by contraction, and the tubular workpiece can be removed.

[0047] In this embodiment, the fixed end 231 of the spring clamp 23 is disposed in the second through hole 112 , and an expansion clamp 233 is disposed at the other end. A limiting portion 234 abutting against the bracket 1 is disposed between the fixed end 231 and the expansion clamp 233 .

[0048] Specifically, the expansion chuck 233 is a plurality of expansion teeth spaced apart in the circumferential direction, and the expansion teeth are elastic sheets with good elastic properties, which can be radially lifted and reset by the protrusion 223. When the expansion chuck 233 is in the retracted state, the diameter of the expansion joint 233 matches the inner hole clearance of the tubular workpiece 4, and can be inserted into the inner hole of the tubular workpiece 4. Under the action of force, the expansion chuck 233 can be expanded to increase its diameter, so as to clamp on the inner wall of the inner hole of the tubular workpiece 4, thereby clamping the tubular workpiece 4.

[0049] In this embodiment, the spring chuck 23 is also provided with a core hole 232 with two ends connected, and the pull rod 22 is sleeved in the core hole 232 and slidably cooperates with the core hole 232, and is fixed on the bracket 1 due to the limit portion 234. At the same time, the other end of the pull rod 22 is provided with a protrusion 223, and the protrusion 223 is a structure protruding along the radial direction of the pull rod 22, and the diameter of the protrusion 223 is greater than the diameter of the core hole 232.

[0050] During operation, when the protrusion 223 is located at the maximum diameter of the expansion chuck 233, the expansion chuck 233 is in a retracted state, and when the lifting rod 21 drives the pull rod 22 to move along the inside of the core hole 232, the expansion chuck 233 will be radially pushed open, so that the head diameter of the expansion chuck 233 opens like an umbrella, thereby clamping the inner hole of the tubular workpiece 4; otherwise, it is loosened and the tubular workpiece 4 can be removed from the expansion chuck 233.

[0051] The driving member 13 is arranged on the bracket 1, and the output end of the driving member 13 is arranged on the other end of the tilting rod 21, driving the tilting rod 21 to swing in a seesaw manner around the hinge axis in the first through hole 111. When the driving member 13 lifts one end of the tilting rod 21, the tilting rod 21 swings around the hinge axis in the first through hole 111, and the other end of the tilting rod 21 hinged to the pull rod 22 is pressed down, thereby driving the pull rod 22 to move downward.

[0052] Specifically, the driving member 13 may be a cylinder, which drives the tilting rod 21 to rotate around the hinge axis, and then drives the pull rod 22 to move along the spring clamp 23 and the second through hole 112. At this time, the protrusion 223 on the head of the pull rod 22 will be pulled into the expansion clamp 233. Since the diameter of the protrusion 223 is larger than the diameter of the core hole 232 of the spring clamp 233 (also the diameter of the expansion clamp 233), the expansion clamp 233 is radially expanded; if it moves in the opposite direction, the expansion clamp 233 is retracted.

[0053] In this way, if a tubular workpiece 4 with an inner hole is to be clamped, it can be achieved that: in the retracted state, the expansion chuck 233 is extended into the inner hole of the tubular workpiece 4, and then the pull rod 22 is pulled by the cylinder to expand the expansion chuck 233 to clamp the inner hole of the tubular workpiece 4; conversely, it is retracted and released, and the tubular workpiece 4 can be removed from the expansion chuck 233, achieving a fast and stable clamping effect.

[0054] Furthermore, if Figure 4 and Figure 6 As shown, in this embodiment, a plurality of spacing holes 2331 are arranged in a circumferential array on the expansion chuck 233, and the spacing holes 2331 extend from one end of the expansion chuck 233 to the other end of the expansion chuck 233. The arrangement of the spacing holes 2331 enables the expansion chuck 233 to form an alternating design of expansion teeth and spacing holes 2331.

[0055] Specifically, the structural design of the multiple spacing holes 2331 can make the expansion chuck 233 have good elastic properties, and the spacing holes 2331 are arranged in a circular array, so that the expansion chuck 233 can be evenly stretched in all directions, and the clamping points falling on the inner wall of the inner hole of the tubular workpiece 4 are evenly distributed, achieving the effect of automatic centering and improving the stability of clamping.

[0056] Furthermore, if Figure 4 As shown, in this embodiment, a circular hole 23311 is provided at one end of the spacing hole 2331 near the limiting portion 234. The design of the circular hole 23311 makes the root of the expansion tooth of the expansion chuck 233 thinner (that is, it is convenient for the expansion tooth to bend), and it is convenient for the protrusion 223 to radially push and reset the head of the expansion chuck 233, which has good practicality.

[0057] like Figure 2 and Figure 3 As shown, in this embodiment, the axis of the second through hole 112 forms an angle of 0° to 90° with the horizontal plane.

[0058] Specifically, the axis of the second through hole 112 can form an angle of 45° with the horizontal plane. When the driving member 13 drives one end of the lifting rod 21 to lift or press down, the lifting rod 21 can more easily drive the pull rod 22 to move downward or upward along the core hole 232, and make the axis of the spring clamp 23 also form an angle of 45° with the horizontal plane, so that the tubular workpiece 4 can be picked up in an oblique insertion manner, the operation is more convenient, and the positioning of the tubular workpiece 4 is more accurate.

[0059] like Figure 2 , Figure 4 and Figure 6 As shown, in this embodiment, a plurality of reinforcing protrusions 2332 are provided on the expansion chuck 233, and the reinforcing protrusions 2332 are located between two adjacent spacing holes 2331. Since a plurality of spacing holes 2331 are provided on the expansion chuck 233, the structural strength of the expansion chuck 233 can be enhanced by providing reinforcing protrusions 2332 between two adjacent spacing holes 2331. At the same time, when picking up the tubular workpiece 4, the bottom edge of the tubular workpiece 4 can be abutted against the reinforcing protrusions 2332 to position the tubular workpiece 4, avoid the tubular workpiece 4 from deflecting, and further ensure the accuracy and stability of clamping.

[0060] like Figure 4 As shown, in this embodiment, the core hole 232 includes a first core hole 2321 and a second core hole 2322 that are connected to each other. The diameter of the first core hole 2321 gradually increases toward one end of the expansion chuck 233, and the diameter of the second core hole 2322 is matched with the diameter clearance of the pull rod 22; the diameter of the protrusion 223 is smaller than the maximum diameter of the first core hole 2321, and the diameter of the protrusion 223 is larger than the diameter of the second core hole 2322.

[0061] Specifically, when the expansion chuck 233 is in a retracted state, the protrusion 223 of the pull rod 22 is located at the maximum diameter of the first core hole 2321, and when the pull rod 22 moves downward along the core hole 232, the design of the first core hole 2321 facilitates guiding the protrusion 223 of the pull rod 22 into the first core hole 2321 and the second core hole 2322, and allows the expansion chuck 233 to be radially expanded by the protrusion 223, thereby clamping on the inner wall of the inner hole of the tubular workpiece 4.

[0062] like Figure 4 and Figure 6 As shown, in this embodiment, the side wall of the protrusion 223 is provided with a first arc surface 2231, and the side wall of the first core hole 2321 is provided with a second arc surface 23211 adapted to the first arc surface 2231. The first arc surface 2231 and the second arc surface 23211 are concentric arc surface designs, and the second arc surface 23211 is slightly larger than the first arc surface 2231, so that the protrusion 223 is convenient to move along the first core hole 2321 and enter the second core hole 2322 to open the expansion chuck 233.

[0063] like Figure 2 and Figure 5 As shown, in this embodiment, an adapter 222 is provided at one end of the pull rod 22, and the adapter 222 is hinged to the axis of the tilting rod 21. The adapter 222 is provided to strengthen the firmness of the hinge between the pull rod 22 and the tilting rod 21, and the diameter of the adapter 222 is larger than the diameter of the pull rod 22, which makes it easier for the tilting rod 21 to drive the pull rod 22 to move.

[0064] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, this embodiment also includes a connection part 3 for mounting the clamping tool on the manipulator, the connection part 3 includes a first flange 31 and a second flange 32, the second flange 32 is sleeved outside the first flange 31, the middle of the first flange 31 is provided with an inwardly recessed clamping groove 311, one end of the bracket 1 can be bolted or welded vertically on the clamping groove 311 to ensure the stability and accuracy of the connection. The first flange 31 is provided with a plurality of connection holes 312 for mounting on the manipulator by bolting, and the second flange 32 is provided with a plurality of mounting holes 321 for connecting with the output end of the manipulator. The manipulator delivers the tubular workpiece 4 to the grinding station, and realizes the grinding and polishing of the tubular workpiece 4 through operations such as swinging and rotating.

[0065] like Figure 1 , Figure 2 and Figure 5 As shown, in this embodiment, the driving member 13 is a cylinder, and the output end of the driving member 13 is the rod end of the cylinder. The rod end of the cylinder is hinged to the strip hole 211 at the other end of the lifting rod 21 through a pin to lift or pull down one end of the lifting rod 21.

[0066] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A clamping tool, characterized in that: include: A bracket, comprising a first side surface and a second side surface arranged opposite to each other, wherein a first through hole and a second through hole are arranged on the first side surface, and the first through hole and the second through hole penetrate the bracket and intersect at the second side surface; A clamping assembly, comprising a tilting rod, a pulling rod and a spring chuck, wherein the middle axis of the tilting rod is hingedly arranged in the first through hole, the fixed end of the spring chuck is arranged in the second through hole, the spring chuck is provided with a core hole connecting the two ends, the pulling rod is sleeved in the core hole, and one end of the pulling rod is hingedly arranged with one end axis of the tilting rod; The other end of the spring chuck is provided with an expansion chuck, the spring chuck is provided with a limiting portion abutting against the bracket, the limiting portion is located between the expansion chuck and the fixed end, and the other end of the pull rod is provided with a protrusion for radially expanding or contracting the expansion chuck; and A driving member is arranged on the bracket, and an output end of the driving member is arranged on the other end of the tilting rod, driving the tilting rod to swing back and forth around the hinge axis.

2. The clamping tool according to claim 1, characterized in that: The axis of the second through hole forms an angle of 0° to 90° with the horizontal plane.

3. The clamping tool according to claim 1, characterized in that: A plurality of spacing holes are arranged in a circumferential array on the expansion chuck, and the spacing holes extend from one end of the expansion chuck to the other end of the expansion chuck.

4. The clamping tool according to claim 3, characterized in that: A round hole is arranged at one end of the spacing hole close to the limiting portion.

5. The clamping tool according to claim 4, characterized in that: The expansion chuck is provided with a plurality of reinforcing protrusions, and the reinforcing protrusions are located between two adjacent spacing holes.

6. The clamping tool according to claim 1, characterized in that: The core hole includes a first core hole and a second core hole that are connected to each other. The diameter of the first core hole gradually increases toward one end of the expansion chuck, and the diameter of the second core hole is loosely matched with the diameter of the pull rod. The diameter of the protrusion is smaller than the maximum diameter of the first core hole, and the diameter of the protrusion is larger than the diameter of the second core hole.

7. The clamping tool according to claim 6, characterized in that: The side wall of the protrusion is provided with a first arc surface, and the side wall of the first core hole is provided with a second arc surface matched with the first arc surface.

8. The clamping tool according to claim 6, characterized in that: An adapter is provided at one end of the pull rod, the adapter is hinged to the tilting rod shaft, and the diameter of the adapter is larger than the diameter of the pull rod.

9. The clamping tool according to claim 1, characterized in that: It also includes a connecting portion, the connecting portion includes a first flange and a second flange, the second flange is sleeved outside the first flange, the middle of the first flange is provided with an inwardly recessed clamping groove, and one end of the bracket is vertically arranged on the clamping groove; The first flange is provided with a plurality of connection holes, and the second flange is provided with a plurality of mounting holes.

10. The clamping tool according to claim 1, characterized in that: The driving member is a cylinder, and the output end of the driving member is the rod end of the cylinder. The rod end of the cylinder is hinged to the strip hole at the other end of the tilting rod through a pin.

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