CN204269471U

CN204269471U - A kind of multi-functional uni-directional stretching test clamp

Info

Publication number: CN204269471U
Application number: CN201420805227.9U
Authority: CN
Inventors: 闫雪燕; 庄蔚敏; 解东旋; 郭帅; 李晓鹏
Original assignee: Jilin University
Current assignee: Jilin University
Priority date: 2014-12-17
Filing date: 2014-12-17
Publication date: 2015-04-15
Anticipated expiration: 2024-12-17

Abstract

The utility model discloses a kind of multi-functional uni-directional stretching test clamp, relate to the technical field of mechanics experimental equipment, comprise stiff end axle, rotating nut, clamp body, mandrel, T-shaped mandrel, spring, fixture block, filling block, lower clamp body, dowel hole, register pin, rotating nut and mandrel are threaded connection, mandrel is connected by feather key with between stiff end axle and clamp body, spring connecting mandrel and T-shaped mandrel, fixture block and T-shaped mandrel overlap, filling block is assembled by register pin and fixture block, it is characterized in that: after given fixture initial clamping force, in the drawing process of test specimen, fixture block will be promoted by the spring compressed and continue motion, contributing to fixture block draws tighter and tighter, and make fixture block motion in tapered fixture consistent, improve drawing effect, when pressing from both sides bar, add the contact between test specimen and fixture compared with conventional brace, friction force becomes large, improves clamping effect, one group of fixture block can realize the clamping of polytype test specimen, labor and material saving.

Description

A kind of multi-functional uni-directional stretching test clamp

Technical field

The utility model relates to a kind of multi-functional uni-directional stretching test clamp, relates to the technical field of mechanics experimental equipment, and same group of fixture block can realize the clamping of polytype test specimen, effectively can improve drawing effect for traditional stretching clamp.

Background technology

Tension test is the important channel obtaining material mechanical parameters, utilizes tension test can determine the data such as elastic modulus, length growth rate, yield strength, tensile strength of material, is therefore widely used again because this method is simple and reliable.

Fixture is requisite important component part on various cupping machine, and on existing fixture, same group of fixture block can only clamping one type test specimen, and expense of taking a lot of work like this is expected; For traditional tapered fixture, there is fixture block to move inconsistent deficiency, and in the process stretched, because the friction force between fixture block and test specimen not skidding occur, drawing effect can be affected.

Summary of the invention

In order to improve existing stretching clamp, the utility model provides a kind of multi-functional uni-directional stretching test clamp, this fixture not only can realize the clamping of polytype test specimen, and to add between test specimen with fixture effective contacts, increase the friction force of test specimen and fixture, improve drawing effect, this fixture can play the feature that tapered fixture draws tighter and tighter better, can improve tapered fixture fixture block in drawing process simultaneously and to move inconsistent deficiency.

The technical scheme that the utility model adopts is: a kind of multi-functional uni-directional stretching test clamp, comprise stiff end axle, rotating nut, clamp body, mandrel, T-shaped mandrel, spring, fixture block, filling block, lower clamp body, dowel hole, register pin, its feature is: rotating nut and clamp body and stiff end axle limit degree of freedom in the axial direction, rotating nut can only rotate centered by mandrel, mandrel and rotating nut are threaded connection, mandrel is connected by feather key with between stiff end axle and clamp body, mandrel is under the rotary motion effect of rotating nut, by the guiding of feather key, rectilinear motion is done along stiff end axle and clamp body, spring connecting mandrel and T-shaped mandrel, fixture block and T-shaped mandrel overlap, two fixture blocks can be made like this to be synchronized with the movement, avoid because fixture block moves inconsistent and affect clamping force, dismountable filling block is assembled together by register pin and fixture block, the clamping of dissimilar test specimen can be realized by the dismounting of filling block.

Fixture block is fluted, when fixture block fits together, the xsect of groove is an orthohexagonal part, when test specimen is bar, and just can realize with six of groove faces tangent when meeting certain size, and then realize " six bar line " clamping, compared with the fixture block clamped with traditional " four bar line ", add surface of contact, increase the friction force between test specimen and fixture block, thus be conducive to clamping.

The utility model has the advantages that: after having applied initial pretightning force, in the process stretched, continued to promote fixture block together with T-shaped mandrel by the spring compressed in fixture, be conducive to fixture block draws tighter and tighter under the drive of test specimen, and ensure that two fixture blocks motions are consistent, thus play the feature that tapered fixture draws tighter and tighter in drawing process better; When pressing from both sides bar, adding the surface of contact between fixture block and test specimen, improving friction force, improving clamping effect; And one group of fixture block can the polytype test specimen of clamping, both can save the material producing fixture block, and also can reduce processing consuming time.

Accompanying drawing explanation

Below the content expressed by each accompanying drawing of this instructions and the mark in figure are briefly described:

Fig. 1 is the schematic diagram of upper fixture described in the utility model;

Vertical view when Fig. 2 is the tight test specimen of fixture block in fixture described in the utility model;

Fig. 3 is the vertical view of traditional fixture block when clamping test specimen;

Fig. 4 is the wiring layout of fixture described in the utility model;

Fig. 5 is the schematic diagram of fixture block in fixture described in the utility model;

Fig. 6 is the schematic diagram of filling block in fixture described in the utility model;

1, stiff end axle; 2, rotating nut; 3, clamp body; 4, mandrel; 5, spring; 6, T-shaped mandrel; 7, a fixture block; 8, two fixture blocks; 9, filling block; 10, test specimen; 11, three fixture blocks; 12, four fixture blocks; 13, lower clamp body; 14, dowel hole; 15, register pin.

Embodiment

Below in conjunction with example figure, the utility model is described further.

If figure the utility model is a kind of fixture of tension test not being only applicable to bar sample and being applicable to sheet coupon, the mechanical property parameters of bar and sheet material accurately can be obtained by this tensile test fixture.

In Fig. 1, rotating nut 2 limits degree of freedom in the axial direction with clamp body 3 and stiff end axle 1, rotating nut 2 can only rotate centered by mandrel 4, mandrel 4 and rotating nut 2 are threaded connection, mandrel 4 is connected by feather key with between stiff end axle 1 and clamp body 3, mandrel 4 is under the rotary motion effect of rotating nut 2, by the guiding of feather key, rectilinear motion is done along stiff end axle 1 and clamp body 3, spring 5 connecting mandrel 4 and T-shaped mandrel 6, turn rotating nut 2 to mandrel 4 one power straight up, mandrel 4 is made to drive spring 5 and T-shaped mandrel 6, and then drive the fixture block 7 be overlapped on T-shaped mandrel 6, two fixture blocks 8 synchronously move upward, make a fixture block 7, two fixture blocks 8 open, test specimen 10 is placed in the middle of a fixture block 7 and two fixture blocks 8, then rotating nut 2 is oppositely turned to the downward power of mandrel 4 one, Compress Spring 5, make a fixture block 7, two fixture blocks 8 synchronously move downward and clamp, thus given test specimen 10 1 initial clamping force, at this moment spring 5 is compressed to extreme position, this is the clamping process of upper fixture, on, effect after lower clamp clamping test specimen 10 as shown in Figure 4.Wherein the clamping process of the same fixture of the clamping process of lower clamp is identical.

Stiff end axle 1 is connected with cupping machine, pull stiff end axle 1, clamp body 3 is moved upward, lower clamp body 13 transfixion, test specimen 10 is stretched, due to the tapered structure of fixture, so stretch process in test specimen 10 by drive one fixture block 7, two fixture blocks 8, three fixture blocks 11, four fixture blocks 12 continue to move along draw direction, fixture block is made to draw tighter and tighter, at this moment mandrel 4 and rotating nut 2 are threaded connection, so geo-stationary moves upward with stiff end axle 1, and at this moment still promoted fixture block by the spring compressed, contribute to a fixture block 7, two fixture blocks 8, three fixture blocks 11, four fixture blocks 12 continue motion and draw tighter and tighter under the drive of test specimen 10, the feature making tapered fixture draw tighter and tighter is brought into play better, T-shaped mandrel 6 can ensure that fixture block motion is consistent, so upper lower clamp is hit by a bullet, spring and T-shaped mandrel is added with the drawing effect helping improve fixture.

As shown in Figure 2, when fixture block fits together, the xsect of groove is an orthohexagonal part, when stretching bar, bar can be realized and groove six faces are tangent, and then fixture block and test specimen just can realize " six bar line " and clamp, and traditional fixture block as shown in Figure 3, and test specimen can only clamp with fixture block four tangent realizations in face " four bar line ".Fixture block of the present utility model adds contact, and test specimen and fixture block friction force are increased, and clamping effect improves.In Fig. 2, the groove of fixture block will ensure that in manufacturing process AB limit equals CD limit, is greater than the half on BC limit and is less than BC limit, and the fixture block groove of two clampings is symmetrical.

Filling block 9 can load and unload, register pin 15 on filling block 9 is matched with the dowel hole 14 of fixture block, filling block is assembled to groove, groove is filled and led up, the clamping that just can be used for sheet material, the surface that surface and fixture block 7, two fixture block 8, three fixture block 11, four fixture block 12 of filling block 9 contact with test specimen is all passed through and is processed increasing friction force.

The utility model mainly provides a kind of multi-functional uni-directional stretching test clamp, mainly after given fixture block initial clamping force, still power can be applied to fixture block in the process that spring stretches at test specimen, contribute to fixture block under the drive of test specimen, to continue motion draw tighter and tighter, and ensure the consistance that fixture block moves; Add contact compared with traditional fixture block, thus increase the friction force between fixture block and test specimen, clamping effect is improved; One group of fixture block can realize the clamping of polytype test specimen, so both can save the material producing fixture block, also can reduce processing consuming time.By reference to the accompanying drawings the utility model is exemplarily described above; everyly have employed the improvement that method of the present utility model conceives the various unsubstantialities carried out; or design of the present utility model and technical scheme directly applied to other occasion, all within protection domain of the present utility model without to improve.

Claims

1. a multi-functional uni-directional stretching test clamp, comprise stiff end axle, rotating nut, clamp body, mandrel, T-shaped mandrel, spring, fixture block, filling block, lower clamp body, dowel hole, register pin, it is characterized in that: rotating nut and clamp body and stiff end axle limit degree of freedom in the axial direction, rotating nut can only rotate centered by mandrel, mandrel and rotating nut are threaded connection, mandrel is connected by feather key with between stiff end axle and clamp body, mandrel is under the rotary motion effect of rotating nut, by the guiding of feather key, rectilinear motion is done along stiff end axle and clamp body, spring connecting mandrel and T-shaped mandrel, fixture block and T-shaped mandrel overlap, two fixture blocks can be made like this to be synchronized with the movement, avoid because fixture block moves inconsistent and affect clamping force, dismountable filling block is assembled together by register pin and fixture block, the clamping of dissimilar test specimen can be realized by the dismounting of filling block.

2. a kind of multi-functional uni-directional stretching test clamp as claimed in claim 1, is characterized in that: the groove fit of described fixture block is to time together, and groove cross section is an orthohexagonal part.