Workpiece clamping and positioning tool

Abstract

The utility model relates to the technical field of clamping tools, in particular to a workpiece clamping and positioning tool. The workpiece clamping and positioning tool comprises a rack, a first clamping and positioning assembly and a second clamping and positioning assembly. The first clamping and positioning assembly comprises a first guide rail, a positive and negative tooth lead screw, a first sliding block, a second sliding block, a first clamping piece, a second clamping piece and a first motor. The second clamping and positioning assembly comprises a second guide rail, a first lifting driving piece, a lifting support, a third sliding block, a second lifting driving piece, a lifting shaft, a connecting rod, a third guide rail and a fourth sliding block. By means of the structural improvement, the clamping stability of large workpieces such as crane supporting legs is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of clamping tooling technology, and in particular to workpiece clamping and positioning tooling. Background Technology

[0002] When large workpieces such as crane outriggers need to be clamped on machine tools, the accuracy and stability of their clamping and positioning are very important to ensure the positioning accuracy of the workpiece during turning and milling. In the existing clamping and positioning fixtures for crane outriggers, clamping is generally achieved by holding the outriggers from the outside with clamping arms; this clamping method has the problem of low stability. Utility Model Content

[0003] The technical problem to be solved by this utility model is to improve the workpiece clamping and positioning fixture structure and enhance the clamping stability of large workpieces such as crane outriggers.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] The workpiece clamping and positioning fixture includes a frame, a first clamping and positioning assembly, and a second clamping and positioning assembly.

[0006] The first clamping and positioning assembly includes a first guide rail, a positive and negative threaded screw, a first slider, a second slider, a first clamping member, a second clamping member, and a first motor;

[0007] The first guide rail is connected to the frame along the X direction, the positive and negative threaded screws are rotatably connected to the frame along the X direction, the first slider is slidably connected to the first guide rail, the first slider is provided with a first nut that mates with the positive thread of the positive and negative threaded screws, the second slider is slidably connected to the second guide rail, the second slider is provided with a second nut that mates with the negative thread of the positive and negative threaded screws, the first clamping member is connected to the upper part of the first slider, the second clamping member is connected to the upper part of the second slider, and the first motor is driven by the positive and negative threaded screws to drive the positive and negative threaded screws to rotate.

[0008] The second clamping and positioning assembly includes a second guide rail, a first lifting drive component, a lifting bracket, a third slider, a second lifting drive component, a lifting shaft, a connecting rod, a third guide rail, and a fourth slider;

[0009] The second guide rail is vertically connected to the frame, the third slider is slidably connected to the second guide rail, and the lifting bracket is connected to the third slider;

[0010] The first lifting drive component is connected between the frame and the third slider, and is used to drive the third slider to move up and down along the second guide rail;

[0011] The lifting support includes a lower base, an upper base, and a fixing plate connecting the upper base and the lower base;

[0012] The second lifting drive is connected to the lower part of the lower seat, and the lifting shaft is vertically connected to the second lifting drive, with the lifting shaft located between the upper seat and the lower seat;

[0013] The upper and lower seats are each provided with multiple third guide rails arranged in a circular array, and the direction of each third guide rail is radial to the lifting shaft;

[0014] Each of the third guide rails is slidably connected to a fourth slider, and a tensioning block is connected to the fourth slider.

[0015] One end of the connecting rod is pivotally connected to the lifting shaft, and the other end is pivotally connected to the tensioning block.

[0016] Furthermore, in the above-mentioned workpiece clamping and positioning fixture structure, the first lifting drive component is a pneumatic cylinder, a hydraulic cylinder, or an electric cylinder.

[0017] Furthermore, in the above-mentioned workpiece clamping and positioning fixture structure, the second lifting drive component is a pneumatic cylinder, a hydraulic cylinder, or an electric cylinder.

[0018] Furthermore, in the above-mentioned workpiece clamping and positioning fixture structure, there are 3 expansion blocks, and the 3 expansion blocks are distributed in a circular array with the axis of the lifting shaft as the center.

[0019] Furthermore, in the above-mentioned workpiece clamping and positioning fixture structure, each expansion block and lifting shaft is connected by two connecting rods.

[0020] The beneficial effects of this utility model are as follows: When large workpieces such as crane outriggers need to be clamped on machine tools, since the overall shape of the crane outriggers is cuboid with a round hole at the bottom, this utility model designs a specific clamping and positioning fixture structure for the structural characteristics of such workpieces. During clamping, the first and second clamping parts can be moved synchronously towards each other or away from each other by the positive and negative screws to center and clamp the outer part of the workpiece. Then, the first lifting drive drives the lifting bracket to move upward, so that the upper and lower seats extend into the round hole at the bottom of the workpiece. Then, by controlling the second lifting drive, the lifting shaft moves upward, so that the connecting rod pushes each tensioning block to move outward along the third guide rail and tightens it against the inner wall of the round hole. The above structural improvements effectively improve the clamping stability of large workpieces such as crane outriggers. When used to clamp conventional workpieces that do not have a round hole at the bottom, the first lifting drive can be controlled to move the lifting bracket downward to a height lower than the first and second clamping parts to avoid interference with the bottom of the workpiece, thereby adapting to the clamping needs of various different workpieces. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a workpiece clamping and positioning fixture according to a specific embodiment of the present utility model;

[0022] Figure 2 for Figure 1 Enlarged view of part A;

[0023] Figure 3 This is a partial structural diagram of the crane outriggers involved in a specific embodiment of the present utility model.

[0024] Label Explanation:

[0025] 1. Rack;

[0026] 2. First clamping and positioning assembly; 21. First guide rail; 22. Positive and negative threaded screw; 23. First slider; 24. Second slider; 25. First clamping component; 26. Second clamping component; 27. First motor;

[0027] 3. Second clamping and positioning assembly; 31. Second guide rail; 32. First lifting drive component; 33. Lifting bracket; 331. Lower seat; 332. Upper seat; 333. Fixing plate; 34. Third slider; 35. Second lifting drive component; 36. Lifting shaft; 37. Connecting rod; 38. Third guide rail; 39. Fourth slider; 310. Tensioning block;

[0028] 4. Crane outriggers; 41. Round hole. Detailed Implementation

[0029] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0030] Please refer to Figures 1 to 3 The present invention relates to a workpiece clamping and positioning fixture, comprising a frame 1, a first clamping and positioning component 2, and a second clamping and positioning component 3.

[0031] The first clamping and positioning assembly 2 includes a first guide rail 21, a positive and negative threaded screw 22, a first slider 23, a second slider 24, a first clamping member 25, a second clamping member 26, and a first motor 27;

[0032] The first guide rail 21 is connected to the frame 1 along the X direction, the positive and negative threaded screw 22 is rotatably connected to the frame 1 along the X direction, the first slider 23 is slidably connected to the first guide rail 21, the first slider 23 is provided with a first nut that engages with the positive thread of the positive and negative threaded screw 22, the second slider 24 is slidably connected to the second guide rail 31, the second slider 24 is provided with a second nut that engages with the negative thread of the positive and negative threaded screw 22, the first clamping member 25 is connected to the upper part of the first slider 23, the second clamping member 26 is connected to the upper part of the second slider 24, and the first motor 27 is drivenly connected to the positive and negative threaded screw 22 to drive the positive and negative threaded screw 22 to rotate;

[0033] The second clamping and positioning assembly 3 includes a second guide rail 31, a first lifting drive component 32, a lifting bracket 33, a third slider 34, a second lifting drive component 35, a lifting shaft 36, a connecting rod 37, a third guide rail 38, and a fourth slider 39.

[0034] The second guide rail 31 is vertically connected to the frame 1, the third slider 34 is slidably connected to the second guide rail 31, and the lifting bracket 33 is connected to the third slider 34;

[0035] The first lifting drive unit 32 is connected between the frame 1 and the third slider 34, and is used to drive the third slider 34 to move up and down along the second guide rail 31;

[0036] The lifting support 33 includes a lower base 331, an upper base 332, and a fixing plate 333 connecting the upper base 332 and the lower base 331;

[0037] The second lifting drive 35 is connected to the lower part of the lower seat 331, and the lifting shaft 36 is vertically connected to the second lifting drive 35. The lifting shaft 36 is located between the upper seat 332 and the lower seat 331.

[0038] The upper seat 332 and the lower seat 331 are respectively provided with multiple third guide rails 38 in a circumferential array, and the direction of each third guide rail 38 is the radial direction of the lifting shaft 36;

[0039] Each third guide rail 38 is slidably connected to a fourth slider 39, and a tensioning block 310 is connected to the fourth slider 39;

[0040] One end of the connecting rod 37 is pivotally connected to the lifting shaft 36, and the other end is pivotally connected to the tensioning block 310.

[0041] In the above embodiments, when large workpieces such as crane outrigger 4 need to be clamped on a machine tool, since the overall shape of crane outrigger 4 is a cuboid with a round hole 41 at the bottom, this utility model designs a specific clamping and positioning fixture structure for the structural characteristics of such workpieces. During clamping, the positive and negative threaded screws 22 can be used to drive the first clamping member 25 and the second clamping member 26 to move synchronously towards each other or away from each other to center and clamp the outer part of the workpiece. Then, the first lifting drive member 32 drives the lifting bracket 33 to move upward, so that the upper seat 332 and the lower seat 331 extend into the round hole 41 at the bottom of the workpiece. Then, by controlling the second lifting drive member 35 to drive the lifting shaft 36 to move upward, the connecting rod 37 pushes each tensioning block 310 to move outward along the third guide rail 38 and tighten it against the inner wall of the round hole 41. The above structural improvement effectively improves the clamping stability of large workpieces such as crane outrigger 4.

[0042] When used to clamp conventional workpieces that do not have a round hole 41 at the bottom, the lifting bracket 33 can be moved downwards to a height lower than the first clamping member 25 and the second clamping member 26 by controlling the first lifting drive member 32, so as to avoid interference with the bottom of the workpiece and thus adapt to the clamping requirements of various different workpieces.

[0043] In a preferred embodiment, the first lifting drive component 32 is a cylinder, a hydraulic cylinder, or an electric cylinder, preferably a cylinder.

[0044] In a preferred embodiment, the second lifting drive component 35 is a cylinder, a hydraulic cylinder, or an electric cylinder, preferably a cylinder.

[0045] In a preferred embodiment, the number of tensioning blocks 310 is three, and the three tensioning blocks 310 are arranged in a circular array with the axis of the lifting shaft 36 as the center, which further improves the stability of the tensioning clamping.

[0046] In a preferred embodiment, two connecting rods 37 are connected between each tensioning block 310 and the lifting shaft 36 to further improve the stability of the tensioning clamp.

[0047] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A workpiece clamping and positioning fixture, characterized in that, Includes a frame, a first clamping and positioning assembly, and a second clamping and positioning assembly; The first clamping and positioning assembly includes a first guide rail, a positive and negative threaded screw, a first slider, a second slider, a first clamping member, a second clamping member, and a first motor; The first guide rail is connected to the frame along the X direction, the positive and negative threaded screws are rotatably connected to the frame along the X direction, the first slider is slidably connected to the first guide rail, the first slider is provided with a first nut that mates with the positive thread of the positive and negative threaded screws, the second slider is slidably connected to the second guide rail, the second slider is provided with a second nut that mates with the negative thread of the positive and negative threaded screws, the first clamping member is connected to the upper part of the first slider, the second clamping member is connected to the upper part of the second slider, and the first motor is driven by the positive and negative threaded screws to drive the positive and negative threaded screws to rotate. The second clamping and positioning assembly includes a second guide rail, a first lifting drive component, a lifting bracket, a third slider, a second lifting drive component, a lifting shaft, a connecting rod, a third guide rail, and a fourth slider; The second guide rail is vertically connected to the frame, the third slider is slidably connected to the second guide rail, and the lifting bracket is connected to the third slider; The first lifting drive component is connected between the frame and the third slider, and is used to drive the third slider to move up and down along the second guide rail; The lifting support includes a lower base, an upper base, and a fixing plate connecting the upper base and the lower base; The second lifting drive is connected to the lower part of the lower seat, and the lifting shaft is vertically connected to the second lifting drive, with the lifting shaft located between the upper seat and the lower seat; The upper and lower seats are each provided with multiple third guide rails arranged in a circular array, and the direction of each third guide rail is radial to the lifting shaft; Each of the third guide rails is slidably connected to a fourth slider, and a tensioning block is connected to the fourth slider. One end of the connecting rod is pivotally connected to the lifting shaft, and the other end is pivotally connected to the tensioning block.

2. The workpiece clamping and positioning fixture according to claim 1, characterized in that, The first lifting drive component is a pneumatic cylinder, a hydraulic cylinder, or an electric cylinder.

3. The workpiece clamping and positioning fixture according to claim 1, characterized in that, The second lifting drive component is a pneumatic cylinder, a hydraulic cylinder, or an electric cylinder.

4. The workpiece clamping and positioning fixture according to claim 1, characterized in that, There are 3 tensioning blocks, which are arranged in a circular array with the axis of the lifting shaft as the center.

5. The workpiece clamping and positioning fixture according to claim 4, characterized in that, Two connecting rods connect each tensioning block to the lifting shaft.

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