CN211697261U

CN211697261U - Wire drawing clamp

Info

Publication number: CN211697261U
Application number: CN202020126350.3U
Authority: CN
Inventors: 李红英; 靳东
Original assignee: Central South University
Current assignee: Central South University
Priority date: 2020-01-20
Filing date: 2020-01-20
Publication date: 2020-10-16
Anticipated expiration: 2030-01-20

Abstract

The utility model provides a wire rod stretching clamp, include: the clamp comprises a clamp body, a clamping part, a locking connecting piece, a locking bolt and a compression spring. An inner cavity is formed in the center of the clamp main body in a penetrating manner along the vertical direction, the upper end face of the inner cavity is larger than the lower end face of the inner cavity, and at least two bolt holes which are symmetrically distributed and penetrate through the inner cavity along the vertical direction are formed in the mode of surrounding the inner cavity; the shape of the clamping component is matched with the shape of the inner cavity of the clamp main body, and the clamping component consists of at least two clamping blocks, the inner walls of which are provided with clamping arc grooves and anti-skid grains; the locking connecting piece is installed on the clamp main body through a locking bolt, and a compression spring is arranged between the locking connecting piece and the clamping component. The clamp can be used for testing the tensile property and the creep property of the wire rods under the conditions of different temperatures and different speeds, the sample is convenient to clamp, the coaxiality requirement of the tensile test can be guaranteed, the sample is prevented from slipping and abnormal fracture is prevented, the data accuracy is improved, and the clamp has practicability.

Description

Wire drawing clamp

Technical Field

The utility model relates to a material detects technical field, in particular to wire rod stretching clamp.

Background

The tensile test is a common method for measuring the mechanical properties of materials, and different types of samples are usually fixed by using corresponding types of clamps. For the measurement of the mechanical properties of the wire, a winding, wedge or clamp type fixture is generally used to clamp the sample. Although the winding type clamp can clamp the sample, the wire can generate larger plastic deformation in the winding and clamping process, and the tensile sample is difficult to break within the sample gauge length, so that the validity of the measured mechanical property data cannot be ensured. When a wedge-shaped or clamp-type clamp is used for clamping an isometric wire to perform a tensile test, a clamping section of a sample generates certain plastic deformation, and when the clamping section is serious, a part of the clamping section is fractured, so that the validity of a test result, especially the validity of elongation data, cannot be ensured; when the wedge-shaped or clamp-type clamp sample is adopted for high-temperature tensile test, the clamping section of the sample is easy to loosen and soften, the phenomenon of sample slip is very likely to occur, and in addition, the wedge-shaped or clamp-type clamp has large volume and complex structure and is not easy to install on a high-temperature tensile testing machine.

SUMMERY OF THE UTILITY MODEL

The utility model provides a tensile anchor clamps of wire rod, its purpose is not good, the sample skids or the clamping section fracture in order to solve current anchor clamps clamping effect, and then can't guarantee the problem of data accuracy or validity.

In order to achieve the above object, the utility model provides a wire rod tensile jig, include:

the clamp comprises a clamp body, wherein an inner cavity and at least two symmetrically distributed bolt holes which are communicated in the vertical direction are formed in the center of the clamp body in a through manner along the vertical direction, the bolt holes are formed around the inner cavity in a through manner along the vertical direction, and the upper end surface of the inner cavity is larger than the lower end surface of the inner cavity;

the shape of the clamping component is matched with that of the inner cavity, the lower end face of the clamping component is smaller than that of the inner cavity, the upper end face of the clamping component is larger than that of the inner cavity, the clamping component is composed of at least two clamping blocks which are symmetrically distributed, and the inner wall of each clamping block is provided with a clamping arc groove and anti-skid grains;

the clamp comprises a locking connecting piece, wherein an upper bolt hole corresponding to the bolt hole is formed in the locking connecting piece, the locking connecting piece is installed on the clamp body in a matched mode with the bolt hole and the upper bolt hole through a locking bolt and a nut, a compression spring is arranged at the bottom of the locking connecting piece, and a connecting section capable of being connected with a stretching machine is fixedly arranged at the top of the locking connecting piece.

Furthermore, a clamping groove is formed in the top surface of one of the clamping blocks, which is located beside the clamping arc groove, and the clamping arc groove is communicated with the clamping groove.

Furthermore, a boss is arranged at the bottom of the locking connecting piece, the shape of the boss is matched with that of the inner cavity, and the compression spring is placed below the boss.

The above technical scheme of the utility model has following beneficial effect:

1. the clamp has a simple structure and is easy and convenient to operate, and the wire is bent and placed into the clamping groove and is pre-tightened by the compression spring, so that the clamping section of the wire cannot generate obvious plastic deformation, and abnormal fracture is avoided;

2. the boss below the locking connecting piece can help to position, ensure the wire and the clamp to be coaxial and ensure the coaxiality requirement of a tensile test;

3. the wire rod clamping device has a self-locking function, and when a wire rod tensile test is carried out, the clamping force can be increased by reducing the diameter of the clamping part, so that the test sample is effectively prevented from slipping and dropping off.

The utility model discloses can be used for wire rod tensile properties, creep property test under different temperature and the different speed condition, have the practicality.

Drawings

FIG. 1 is a sectional view of the overall structure of the stretching jig of the present invention;

FIG. 2 is a cross-sectional view of the main body of the stretching clamp of the present invention;

fig. 3 is a top view of the clamp body of the stretching clamp of the present invention;

fig. 4 is a cross-sectional view of a clamping member of the stretching clamp of the present invention, which is composed of three clamping blocks;

fig. 5 is a top view of a clamping member of the stretching clamp of the present invention, which is composed of three clamping blocks;

fig. 6 is a schematic structural view of a clamping block of the stretching clamp of the present invention;

fig. 7 is a schematic structural view of a locking connector of the stretching clamp of the present invention;

fig. 8 is a first installation view of the wire stretching jig of the present invention;

fig. 9 is a second installation view of the wire stretching jig of the present invention.

[ description of reference ]

1-a clamp body; 2-a clamping member; 3-locking the connecting piece; 4-locking the bolt; 5-a nut; 6-a compression spring; 7-wire rod; 11-lumen; 12-bolt holes; 21-a clamping block; 22-a clamping channel; 31-upper bolt holes; 32-a connecting segment; 33-a boss; 211-clamping arc groove; 212-non-slip pattern; 213-grip recess.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.

To current anchor clamps clamping effect not good, the clamping sample of institute skids or the clamping section fracture, and then can't guarantee the problem of data validity or accuracy, the utility model provides a wire rod tensile anchor clamps.

An embodiment of the utility model provides a wire rod stretching clamp, include: the clamp comprises a clamp body 1, wherein an inner cavity 11 and at least two symmetrically distributed bolt holes 12 which are communicated in the vertical direction are formed in the center of the clamp body 1 in a through manner along the vertical direction, the bolt holes 12 are formed around the inner cavity 11 in a through manner along the vertical direction, and the upper end surface of the inner cavity 11 is larger than the lower end surface; the shape of the clamping component 2 is matched with that of the inner cavity 11, the lower end face of the clamping component 2 is smaller than that of the inner cavity 11, the upper end face of the clamping component 2 is larger than that of the inner cavity 11, the clamping component 2 is composed of at least two clamping blocks 21 which are symmetrically distributed, and the inner wall of each clamping block 21 is provided with a clamping arc groove 211 and an anti-skid pattern 212; the clamp comprises a locking connecting piece 3, wherein an upper bolt hole 31 corresponding to the bolt hole 12 is formed in the locking connecting piece 3, the locking connecting piece 3 is installed on the clamp body 1 in a matched mode with the bolt hole 12 and the upper bolt hole 31 through a locking bolt 4 and a nut 5, a compression spring 6 is arranged at the bottom of the locking connecting piece 3, and a connecting section 32 capable of being connected with a stretching machine is fixedly arranged at the top of the locking connecting piece 3.

In the wire stretching clamp provided by the embodiment of the utility model, the shape of the clamp body 1 includes but is not limited to a cylinder, so as to ensure compact shape and reduce the processing difficulty and the installation difficulty; the number of the bolt holes 12 may be two, three or four, and as shown in fig. 2 and fig. 3, according to needs, three bolt holes 12 are symmetrically formed in the present embodiment, and the number of the locking bolts 4, the number of the nuts 5, and the number of the upper bolt holes 31 are all three and symmetrically distributed, so that the locking connecting member 3 and the fixture body 1 are stressed uniformly after a sample is clamped, and the bottom surface of the locking connecting member 3 is parallel to the top surface of the fixture body 1, so that the compression spring 6 can provide uniform pre-tightening force to the clamping member 2.

The clamping part 2 of the present invention is composed of at least two symmetrically distributed clamping blocks 21, and the present embodiment is preferably composed of three symmetrically distributed clamping blocks 21, as shown in fig. 4 and 5. The plurality of clamping blocks 21 are arranged to facilitate clamping of the wire 7, a clamping groove 213 is formed in the top surface of one of the clamping blocks 21, which is located beside the clamping arc groove 211, the clamping groove 213 is communicated with the clamping arc groove 211, and when the wire 7 is clamped, the end of the wire 7 can be bent along the bottom surface of the clamping groove 213, so that the wire 7 is fixed; each clamping block 21 is provided with a clamping arc groove 211 and an anti-slip pattern 212, as shown in fig. 6, so as to prevent the wire 7 from being deformed and/or slipping obviously when being stretched; in this embodiment, when three clamping blocks 21 are combined to form the clamping part 2, a clamping channel 22 is formed in the center of the clamping part 2, after the wire 7 is put into the clamping channel 22, the clamping part 2 is put into the inner cavity 11 together with the wire 7, then the compression spring 6 is placed on the top end of the clamping part 2, the locking bolt 4 is used to fasten the locking connector 3 and the clamp body 1, since the lower end surface of the clamping part 2 is smaller than the lower end surface of the inner cavity 11 and the upper end surface of the clamping part 2 is larger than the lower end surface of the inner cavity 11, as the clamping part 2 moves down, the gap between each clamping block 21 becomes smaller and smaller, and the clamping part 2 is reduced in diameter so that the clamping arc groove 211 clamps the wire 7.

In the embodiment of the present invention, a boss 33 is disposed at the bottom of the locking connector 3, as shown in fig. 7, the shape of the boss 33 is matched with the shape of the inner cavity 11 and has the same inclination, so as to facilitate positioning when the locking connector 3 is installed; the pressing spring 6 is arranged below the boss 33, can apply pressure to the clamping component 2, and provides pretightening force to prevent the wire 7 from slipping off in the initial stage; through the arrangement, when the wire 7 is clamped, the boss 33 can conveniently and smoothly enter the inner cavity 11, so that the compression spring 6 can push the clamping part 2, and a certain pre-clamping force is provided.

When the clamp of the present invention is used for clamping a wire, as shown in fig. 8 and 9, the end of the wire 7 is bent along the bottom surface of the clamping groove 213, the bent section of the wire 7 is disposed in the clamping groove 213, the non-bent section of the clamping section of the wire 7 is disposed in the clamping channel 22 formed by the combination of the clamping blocks 21, the clamping arc groove 211 clamps the wire 7, and then the clamping part 2 and the clamped wire 7 are sent into the inner cavity 11; placing the compression spring 6 on the top end of the clamping part 2, fastening the locking connector 3 and the clamp body 1 by using the locking bolt 4, sinking the boss 33 into the inner cavity 11 along with the locking connector 3, and applying pressure to the clamping part 2 by the compression spring 6 below the boss 33 to prevent the wire 7 from slipping off at the initial stage; as the clamping part 2 moves downwards, the gap between each clamping block 21 becomes smaller, the clamping part 2 is reduced in diameter to enable the inner wall of the clamping arc groove 211 to clamp the wire 7, and the anti-skid thread 212 arranged on the inner wall of the clamping block 21 can increase the friction force of the contact surface of the clamping arc groove 211 and the wire 7; after the tensile fixture completely clamped wire 7, the connecting section 32 of the locking connecting piece 3 is connected with a tensile testing machine, the shape of the connecting section 32 can be designed according to the clamping type of the testing machine, if the hydraulic clamping stretching machine is used, the connecting section 32 can be processed into a plate shape, and a hanging through hole can be opened on the connecting section 32 for hanging the stretching machine.

The embodiment of the utility model provides an use locking bolt 4 and nut 5 will locking

connection piece

3 and 1 fastening connection of anchor clamps main part are in the same place, because bolt hole 12 and last bolt hole 31 all are the symmetric distribution, consequently use when locking bolt 4 and nut 5 compress tightly, locking connection piece 3 with atress is balanced between the anchor clamps main part 1, and then makes clamping part 2 receives even pretightning force, clamping wire rod 7 receives even clamping-force. When the tensile testing machine runs, the clamping part 2 further reduces the diameter along with the increase of the tensile force to increase the clamping force of the clamping channel 22 on the wire 7, so that the wire 7 is ensured not to slip or fall off in the stretching process.

Tensile fixture is used for installing in pairs on tensile testing machine, can be used for wire rod tensile properties, creep property test under different temperature and the different speed condition, simple structure, easy and simple to handle, can guarantee tensile test's axiality requirement and test data's credibility, have the practicality.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A wire stretching clamp, comprising:

the clamp comprises a clamp main body (1), wherein an inner cavity (11) is formed in the center of the clamp main body (1) in a penetrating manner along the vertical direction, at least two bolt holes (12) which are symmetrically distributed and penetrate through the inner cavity (11) along the vertical direction are formed in a surrounding manner, and the upper end surface of the inner cavity (11) is larger than the lower end surface of the inner cavity (11);

the shape of the clamping component (2) is matched with the shape of the inner cavity (11), the lower end face of the clamping component (2) is smaller than the lower end face of the inner cavity (11), the upper end face of the clamping component (2) is larger than the lower end face of the inner cavity (11), the clamping component (2) is composed of at least two clamping blocks (21) which are symmetrically distributed, and the inner wall of each clamping block (21) is provided with a clamping arc groove (211) and an anti-skid pattern (212);

locking connecting piece (3), set up on locking connecting piece (3) with last bolt hole (31) that bolt hole (12) are corresponding, locking connecting piece (3) through locking bolt (4) and nut (5) with bolt hole (12) and last bolt hole (31) cooperate to install on anchor clamps main part (1), the bottom of locking connecting piece (3) is provided with pressure spring (6), the top of locking connecting piece (3) is fixed to be provided with can be with linkage segment (32) that the stretcher links to each other.

2. The wire stretching jig according to claim 1, wherein a clamping groove (213) is formed on the top surface of one of the clamping blocks (21) beside the clamping arc groove (211), and the clamping arc groove (211) communicates with the clamping groove (213).

3. Wire stretching clamp according to claim 1, characterized in that the bottom of the locking connection (3) is provided with a boss (33), the outer shape of the boss (33) matching the shape of the inner cavity (11), the compression spring (6) being placed under the boss.