CN216525135U

CN216525135U - Flexible adjustable clamp for fatigue performance test of arc-shaped plate sample

Info

Publication number: CN216525135U
Application number: CN202122423835.6U
Authority: CN
Inventors: 李松柏; 王宇航; 谷楚; 梁伟
Original assignee: Central South University
Current assignee: Central South University
Priority date: 2021-10-09
Filing date: 2021-10-09
Publication date: 2022-05-13
Anticipated expiration: 2031-10-09

Abstract

The utility model relates to the field of mechanical experiment equipment, and discloses a flexible adjustable clamp for testing fatigue performance of arc-shaped plate samples, which comprises a clamp body, a horizontal guide rail, a sliding block, a positioning bolt, a clamping table, a supporting plate, a long bolt, a wedge block, a bolt for fastening, a nut and the like, wherein the clamp body comprises a horizontal base and two side supporting wall plates, the two side supporting wall plates of the clamp body are provided with lateral threaded holes, the long bolt is arranged in the lateral threaded hole, the horizontal base of the clamp body is provided with the horizontal guide rail, the horizontal guide rail is provided with the sliding block, the middle of the sliding block is provided with a through hole, the positioning bolt is arranged in the through hole and can move up and down, the clamping table and the positioning bolt are fixedly connected together, the clamping table is provided with the wedge block and the supporting plate, compared with the prior art, the flexible adjustable clamp has simple structure and good flexibility, and can clamp samples with different curvatures and different thicknesses, and can suppress the change of curvature of the specimen when a force is applied.

Description

Flexible adjustable clamp for fatigue performance test of arc-shaped plate sample

Technical Field

The utility model relates to the field of mechanical experimental equipment, in particular to a flexible adjustable clamp for testing fatigue performance of an arc-shaped plate sample.

Background

The fatigue testing machine is a mechanical property testing instrument used in the field of mechanics, and adopts microcomputer controlled full-digital wide-frequency electro-hydraulic servo valve to drive precise hydraulic cylinder, and the microcomputer control system can automatically control test force, displacement and deformation in several modes so as to implement the tests of tensile, compression, bending resistance, fatigue and fracture properties of various samples.

The clamp has wide application in the machining and assembling processes. Generally, a tool clamp can only clamp a standard workpiece, the clamping processing of a non-standard workpiece is usually careless, and the design of a new clamp is required according to the shape and the processing requirement of an actual workpiece. In the field of the existing tool clamp, the problems of inaccurate positioning, unstable clamping and inconvenient operation still exist in the clamp for different curvature arc-shaped plate samples.

At present, the clamp for the arc plate samples does not have a unified standard, and has the defects of small application range, poor positioning precision, lack of flexibility, low clamping efficiency and the like, so that how to improve the positioning precision of the arc plate samples with different curvatures, realize stable clamping and easy operation becomes the technical problem to be solved by technical personnel in the field.

Disclosure of Invention

In order to solve the defects of the problems, the utility model aims to provide a flexible adjustable clamp for testing the fatigue performance of an arc-shaped plate sample, which has the advantages of simplicity and convenience in clamping, high clamping efficiency and accuracy and reliability in positioning.

The utility model is realized by the following technical scheme: the utility model provides a carry out fatigue performance test's flexible adjustable fixture to arc plate sample, its characterized in that, the anchor clamps part includes the anchor clamps body, horizontal guide, slider, positioning bolt, presss from both sides tight platform, backup pad, stay bolt, side direction screw hole, voussoir and the bolt and the nut etc. of fastening usefulness, the anchor clamps body comprises horizontal base and two side support wallboards, be provided with a plurality of side direction screw holes on the specific both sides face support wallboard of anchor clamps, the stay bolt is installed in the side direction screw hole, be provided with horizontal guide on the specific horizontal base of anchor clamps, be provided with the slider on the horizontal guide, open in the middle of the slider has the through-hole, positioning bolt installs in the through-hole and can reciprocate, press from both sides tight platform with positioning bolt fixed connection is in the same place, be provided with voussoir and backup pad on the tight platform of clamp.

Preferably, one end of the long bolt is spherical.

Preferably, the number of the horizontal guide rails is two, and the horizontal guide rails are symmetrical with respect to the horizontal base.

Preferably, a sliding block is arranged on the horizontal guide rail, the sliding block is a square sliding block, and the width of the sliding block is consistent with that of the horizontal guide rail.

Preferably, threaded holes are symmetrically formed in the periphery of the sliding block, and bolts and nuts are screwed into the threaded holes, so that the sliding block is fastened on the horizontal guide rail.

Preferably, a through hole is formed in the center of the sliding block, and the diameter of the through hole is slightly larger than that of the positioning bolt.

Preferably, the positioning bolt is connected with the clamping table through a bolt, and after the positioning bolt and the clamping table are located, the positioning bolt and the clamping table are fastened through double nuts.

Preferably, the clamping table is provided with a groove, the wedge blocks are installed in the groove, the wedge blocks are fixed on the clamping table through anti-falling springs, the number of the wedge blocks is two, and a clamping cavity is arranged between the two wedge blocks.

Preferably, the bottom surface of the clamping table is provided with a threaded hole, the supporting plate is installed on the bottom surface of the clamping table, the supporting plate is provided with a bolt matched with the threaded hole, and the supporting plate is fastened on the clamping table through a nut.

Compared with the prior art, the utility model has the beneficial effects that:

1. the method is applicable to arc-shaped plate samples with different curvatures, when the samples are clamped, a clamp body is firstly fastened at one end of a clamping device of a material testing machine, then a clamping table is connected with a positioning bolt on a sliding block by a bolt, then the position of the clamping table is moved and rotated, a clamping cavity between two wedge blocks in the clamping table is aligned with one end of the arc-shaped plate sample, then the bolt on a supporting plate is screwed, the supporting plate drives the wedge blocks to move upwards together with the supporting plate until the wedge blocks can not move upwards any more, the supporting plate is fastened on the clamping device by double nuts, at the moment, one end of the sample is clamped by the wedge blocks, then the sliding block on a horizontal guide rail and the rotating clamping table are moved to proper positions, the other end of the arc-shaped plate sample is aligned with the clamping device of the material testing machine, at the moment, the sliding block, the positioning bolt and the clamping table are fastened at the current position by screwing a matching nut among all parts, because the sliding block, the positioning bolt and the clamping table of the clamp are movable, aiming at arc-shaped plate samples with different curvatures, the wedge block on the clamping table can clamp the arc-shaped plate samples by properly moving and rotating the sliding block, the positioning bolt and the clamping table, and therefore, the clamp has certain universality.

2. The change of the curvature of the arc-shaped plate sample in the stress process can be inhibited, a plurality of lateral threaded holes are formed in two lateral supporting wall plates of the clamp body, the long bolt can be screwed in the lateral threaded holes, after the arc-shaped plate sample is fixedly clamped, the long bolt is screwed in the proper lateral threaded hole, so that the long bolt is fixed by the nut after the two lateral surfaces of the arc-shaped plate sample are clamped, the curvature change of the arc-shaped plate sample in the stress process can be effectively controlled, and the long bolt is spherical with one end in contact with the sample, so that the damage of the clamp to the surface of the sample is effectively avoided.

3. Can guarantee that the atress of arc sample is along the radian direction, when carrying out fatigue test to the arc sample on material testing machine, two sides of arc sample are pressed from both sides with the long bolt tightly, and the upper end of arc sample is along the fixture device of the tight material testing machine of radian direction centering, and the radian direction along the arc can be guaranteed to exerting force to the upper end of arc.

4. The arc plate samples of different thickness are all applicable, and when the sample is clamped, the distance between the two wedge blocks can be adjusted by moving the supporting plate for the samples of different thicknesses, so that the two wedge blocks can tightly clamp the sample.

5. The utility model has the advantages of simple structure, convenient installation, low cost, convenient clamping and dismounting of the arc-shaped plate sample, time and labor saving, and effectively improves the efficiency of mechanical experiments such as fatigue fracture and the like.

Drawings

Fig. 1 is a schematic diagram of the operation of the present invention.

FIG. 2 is a schematic structural view of the clamp body of the present invention.

FIG. 3 is a schematic cross-sectional view at A in FIG. 1 according to the present invention.

Fig. 4 is a schematic structural view of the clamping table of the present invention.

FIG. 5 is a schematic view of the wedge of the present invention.

FIG. 6 is a schematic view of the slider structure of the present invention.

Fig. 7 is a schematic structural view of the positioning bolt of the present invention.

Fig. 8 is a schematic structural view of the long bolt of the present invention.

Fig. 9 is a schematic structural view of the support plate of the present invention.

In the figure: 1 is the arc sample, 2 testing machine clamping device, 3 is the anchor clamps body, 4 are tight platforms, 5 are the voussoir, 6 are the backup pad, 7 are positioning bolt, 8 are the slider, 9 are the through-hole, 10 are the horizontal guide rail, 11 are the side direction screw hole, 12 are the stay bolt, 13 are the spring.

Detailed Description

The following detailed description of the present invention is provided in connection with the accompanying drawings and the detailed description of the present invention. The following examples or figures are illustrative of the present invention and are not intended to limit the scope of the present invention.

Referring to fig. 1-9, the present example provides a flexible and adjustable fixture for fatigue performance testing of arc-shaped plate samples, and the fixture device is mainly divided into a fixture body 3 and a clamping table 4.

The fixture body 3 is composed of a horizontal base and two lateral supporting wall plates, a plurality of lateral threaded holes 11 are formed in the two lateral supporting wall plates of the fixture body, and the long bolts 12 are installed in the lateral threaded holes 11.

The horizontal base of the fixture body 3 is provided with a horizontal guide rail 10, the horizontal guide rail is provided with a sliding block 8, and the sliding block 8 can slide along the horizontal guide rail 10 in a certain direction.

Threaded holes are formed in the periphery of the sliding block 8, and bolts and nuts are screwed into the threaded holes of the sliding block 8, so that the sliding block can be fixed in the horizontal guide rail 10.

A through hole 9 is arranged in the middle of the sliding block 8, the positioning bolt 7 is arranged in the through hole 9 and can move up and down,

the clamping table 4 is fixedly connected with the positioning bolt 7, and a wedge block 5 and a supporting plate 6 are arranged on the clamping table 4.

The use method of the utility model is as follows with the attached drawings:

when a sample is clamped, the clamp body 3 is firstly installed at one end of the clamping device 2 of the material testing machine, then the clamping table 4 is connected with the positioning bolt 7 on the sliding block 8 through a bolt, then the position of the clamping table 4 is moved and rotated, a clamping cavity between two wedge blocks 5 in the clamping table 4 is aligned to one end of the arc-shaped plate sample 1, then the bolt on the support plate 6 in the clamping table 4 is screwed, the support plate 6 drives the wedge blocks 5 to move upwards together, the upward movement is stopped until the wedge blocks 5 can not move upwards, and the support plate 6 is fastened on the clamping table 4 through double nuts, namely, one end of the arc-shaped plate sample 1 is clamped by the wedge blocks 5.

Then, the sliding block 8 on the horizontal guide rail 10 and the rotary clamping table 4 are moved to proper positions, so that the clamping device 2 of the material testing machine can clamp the other end of the arc-shaped plate sample 1 in a centering manner, and at the moment, the sliding block 8, the positioning bolt 7, and bolts and nuts between the positioning bolt 7 and the clamping table 4 are screwed, so that the sliding block 8, the positioning bolt 7 and the clamping table 4 are fastened at the current positions.

After the arc-shaped plate sample 1 is completely fixed and clamped, the long bolt 12 is screwed into the lateral threaded hole 11 on the supporting wall plates on the two side surfaces of the clamp body 3, so that the long bolt 12 can tightly abut against the two surfaces of the arc-shaped plate sample 1, because one end of the long bolt 12 in contact with the sample is spherical, the change of curvature of the arc-shaped plate sample 1 when stressed can be effectively inhibited, and the damage of the long bolt 12 to the surface of the arc-shaped plate sample 1 can be avoided.

The above description is only a preferred embodiment of the present invention, and is not limited to the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a carry out fatigue performance test's flexible adjustable fixture to arc plate sample, its characterized in that, the anchor clamps part includes the anchor clamps body, horizontal guide, slider, positioning bolt, presss from both sides tight platform, backup pad, stay bolt, side direction screw hole, voussoir and the bolt and the nut of fastening usefulness, the anchor clamps body comprises horizontal base and two side support wallboards, be provided with a plurality of screw holes on the specific both sides face support wallboard of anchor clamps, the stay bolt is installed in the screw hole, be provided with horizontal guide on the specific horizontal base of anchor clamps, be provided with the slider on the horizontal guide, be provided with the through-hole in the middle of the slider, positioning bolt installs in the through-hole and can reciprocate, press from both sides tight platform with positioning bolt fixed connection is in the same place, it is provided with voussoir and backup pad to press from both sides tight bench.

2. The flexible adjustable fixture for testing the fatigue performance of arc-shaped plate samples according to claim 1, wherein the slide block is a square slide block, and the width of the slide block is consistent with that of the horizontal guide rail.

3. The flexible adjustable fixture for testing the fatigue performance of the arc-shaped plate sample as claimed in claim 1, wherein the sliding block is symmetrically provided with threaded holes around the sliding block, the threaded holes are screwed with bolts and nuts to fasten the sliding block on the horizontal guide rail, the diameter of the through hole is slightly larger than that of the positioning bolt, and the positioning bolt is fastened on the sliding block by the nut.

4. The flexible adjustable clamp for testing the fatigue performance of the arc-shaped plate test piece as claimed in claim 1, wherein the positioning bolt is connected with the clamping table through a bolt, and after the positioning bolt and the clamping table are positioned, the positioning bolt and the clamping table are fastened through double nuts.

5. The flexible adjustable fixture for testing the fatigue performance of the arc-shaped plate sample according to claim 1, wherein the clamping table is provided with a groove, the wedge block is installed in the groove, the wedge block is fixed on the clamping table by an anti-falling spring, the number of the wedge blocks is two, and a space between the two wedge blocks is a clamping cavity.

6. The flexible adjustable fixture for testing the fatigue performance of the arc-shaped plate sample according to claim 1, wherein a threaded hole is formed in the bottom surface of the clamping table, the supporting plate is mounted on the bottom surface of the clamping table, a bolt matched with the threaded hole is arranged on the supporting plate, and the supporting plate is fastened on the clamping table through a nut.

7. The flexible adjustable fixture for testing the fatigue performance of arc-shaped plate samples according to claim 1, wherein one end of the long bolt is spherical.