CN207717512U - A kind of bar tensile test fixture - Google Patents

Abstract

The utility model discloses a kind of bar tensile test fixtures, it includes clamping fixture seat, and the clamping fixture seat includes fixture set, and the fixture set is internal to be equipped with secondary clamping device, and once clamping device is connected on the secondary clamping device.Clamping device includes fastening sleeve and lower end clamping piece, the lower end clamping piece includes rectangle frame, the lower end of the rectangle frame is provided with elastic bayonet lock, the inner wall of elastic bayonet lock is provided with pawl, the fastening sleeve is connected through a screw thread the outside for being sleeved on elastic bayonet lock；The lower end of the fastening sleeve is tapered.Clamping can be realized to general non-standard component.The holding capability to bar is improved, while can also meet the bar sample of test different-diameter to a certain extent, it is cost-effective.

Description

A bar tensile test fixture

technical field

The utility model belongs to the technical field of auxiliary equipment for stretching experiments of bar materials in material mechanics, and relates to a tensile test fixture for general bar materials.

Background technique

At present, the bar tensile test of material mechanics generally needs to be made into a standard part. Usually, the sample needs to be made into a flange shape with thick ends and a thin middle to facilitate clamping, or a wedge-shaped block is used for clamping, but it can only be realized once. Clamping, in extreme cases, it is easy to cause errors such as clamping instability and slippage, and it is difficult to perform tensile tests on some special bar clamping.

Utility model content

The problem to be solved by the utility model is to provide a clamp which realizes twice clamping on bar material, and can realize clamping on general non-standard parts. Improve the clamping ability of the bar, and at the same time meet the test of bar samples with different diameters to a certain extent, saving costs.

In order to solve the above technical problems, the utility model proposes the following technical solutions: a bar tensile test fixture, which includes a fixture seat, the fixture seat includes a clamp cover, and a secondary clamping device is installed inside the clamp cover. A primary clamping device is connected to the secondary clamping device.

The primary clamping device includes a fastening sleeve and a lower clamping piece, the lower clamping piece includes a rectangular frame, the lower end of the rectangular frame is provided with an elastic bayonet, and the inner wall of the elastic bayonet is provided with inverted teeth, The fastening sleeve is sleeved on the outside of the elastic bayonet through threaded connection; the lower end of the fastening sleeve is tapered.

The secondary clamping device includes a half-clamping block, a pressure block and a stopper. The inner side of the half-clamping block is provided with inverted teeth, and the two ends of the stopper are processed with threaded holes; the stopper is processed with The through hole is symmetrically hinged with two half-clamping blocks through the top pair, and the pressing block adopts a wedge-shaped structure and is arranged between the two symmetrically arranged half-clamping blocks.

The clamp seat includes a clamp cover, the top of the clamp cover is equipped with a collet, and the side wall of the clamp cover is fixedly connected with the stopper of the secondary clamping device through a fixing screw, and the side wall of the clamp cover is processed There is a chute, and the chute forms a sliding fit with the thimble of the secondary clamping device.

The utility model has the following beneficial effects:

1. The clamping device of the present invention can realize two times of clamping on the bar material to improve the clamping capacity, and at the same time, it can also satisfy bar material samples with different diameters to a certain extent, saving cost.

2. There is a tapered sleeve through the fastening sleeve, and the clamping part of the lower clamping part has good elasticity. The two are connected by threads to squeeze and clamp the bar in the circumferential direction, and realize the first clamping.

3. There is a thimble on the half-clamping block, and the thimble is inserted into the through hole of the half-clamping block to limit the movement of the half-clamping block. When the chuck is tightened to realize the connection to the clamp sleeve, the chuck is also clamped in half by the pressure block. The wedge at the upper end of the block is extruded and separated to realize the lever movement of the half-clamped block, ensuring that the part with the inverted teeth at the lower end of the half-clamped block realizes the secondary clamping of the bar.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is a structural diagram of the utility model.

Fig. 2 is a diagram of a clamping device of the present invention.

Fig. 3 is a structural diagram of the lower end clamping part of the present invention.

Fig. 4 is a diagram of the secondary clamping device of the present invention.

Fig. 5 is a diagram of the fixture seat device of the present invention.

In the figure: primary clamping device 1, secondary clamping device 2, clamp seat 3, fastening sleeve 11, lower clamping piece 12, rectangular frame 121, elastic bayonet 122, half clamping block 21, pressing block 22 , Block 23, threaded hole 231, thimble 211, set screw 31, clamp cover 32, collet 33, chute 321, thimble 211.

Detailed ways

Embodiments of the present utility model will be further described below in conjunction with the accompanying drawings.

As shown in Figures 1-5, a bar tensile test fixture includes a fixture seat 3, and the fixture seat 3 includes a clamp cover 32, and a secondary clamping device 2 is installed inside the clamp cover 32. The primary clamping device 1 is connected to the secondary clamping device 2 . The primary clamping device 1 includes a fastening sleeve 11 and a lower clamping piece 12, the lower clamping piece 12 includes a rectangular frame 121, the lower end of the rectangular frame 121 is provided with an elastic bayonet 122, and the elastic bayonet The inner wall of 122 is provided with inverted teeth, and the fastening sleeve 11 is fitted on the outside of the elastic bayonet 122 through threaded connection; the lower end of the fastening sleeve 11 is tapered.

Further, the secondary clamping device 2 includes a half-clamping block 21, a pressure block 22 and a stopper 23, the inside of the half-clamping block 21 is provided with inverted teeth, and the two ends of the stopper 23 are processed with threads hole 231; the stopper 23 is processed with a through hole, and two half clamping blocks 21 are symmetrically hinged on the through hole through the thimble 211, and the pressing block 22 adopts a wedge-shaped structure, and is arranged on two symmetrically arranged Between the half-clamping blocks 21.

Further, the clamp seat 3 includes a clamp cover 32, a chuck 33 is installed on the top of the clamp cover 32, and is fixed to the stopper 23 of the secondary clamping device 2 by a fixing screw 31 on the side wall of the clamp cover 32 Connected, the side wall of the clamp cover 32 is processed with a sliding groove 321 , and the sliding groove 321 forms a sliding fit with the thimble 211 of the secondary clamping device 2 .

Working process and working principle of the present utility model are:

First, the bar sample is inserted into the fastening sleeve 11 and the lower clamping part 12, and the fastening sleeve 11 is tightened so that the tapered sleeve of the sleeve and the elastic clamping part of the lower clamping part 12 form a radial direction. The compressive force realizes one-time clamping of the bar.

Put the lower end clamping part 12 that has clamped the bar into the bayonet of the clamp cover 32, the pressing block 22 penetrates into the round hole of the clamp cover 32, and put the two and a half clamping blocks 21 into the clamp cover 32 symmetrically. In the notch, one side of the thimble 211 is inserted into the chute of the clamp sleeve 32, adjust the distance between the half clamping blocks 21 according to the diameter of the bar, and align the round hole of the block 23 with the thimble according to the position of the thimble 211 of the half clamping block 211, after being adjusted to a proper position, fix the stopper 23 with a fixing screw 31.

Insert one end of the chuck 33 into the connection port of the press clamp, and screw the other end into the threaded hole of the clamp sleeve 32 with a wrench until the clamp 33 is screwed in so that the pressing block 22 moves down, and the half clamping block 21 is wedged apart. The principle of leverage enables the half-clamping block 21 to realize secondary clamping on the bar.

Insert the pin of the press, connect the press with the fixture, and after the inspection is completed, the press can be started to start the test.

Through the above description, those skilled in the art can make various changes and modifications without departing from the technical idea of the utility model, all of which are within the protection scope of the utility model. Unfinished matters of the utility model belong to the common knowledge of those skilled in the art.

Claims (4)

1. a kind of bar tensile test fixture, it is characterised in that：It includes clamping fixture seat（3）, the clamping fixture seat（3）Including fixture set （32）, the fixture set（32）Inside is equipped with secondary clamping device（2）, the secondary clamping device（2）Upper connection is once Clamping device（1）.

2. a kind of bar tensile test fixture according to claim 1, it is characterised in that：Clamping device（1） Including fastening sleeve（11）With lower end clamping piece（12）, the lower end clamping piece（12）Including rectangle frame（121）, the rectangle frame （121）Lower end be provided with elastic bayonet lock（122）, in elastic bayonet lock（122）Inner wall be provided with pawl, the fastening sleeve （11）It is connected through a screw thread and is sleeved on elastic bayonet lock（122）Outside；The fastening sleeve（11）Lower end it is tapered.

3. a kind of bar tensile test fixture according to claim 1, it is characterised in that：The secondary clamping device（2） Including half grip block（21）, briquetting（22）And block（23）, half grip block（21）Inside is provided with pawl, the block （23）Both ends be threaded hole（231）；The block（23）On be machined with through-hole, pass through thimble on the through-hole（211） It is symmetrically hinged that there are two half grip blocks（21）, the briquetting（22）Using wedge structure, and half be arranged symmetrically at two pieces is set Grip block（21）Between.

4. a kind of bar tensile test fixture according to claim 1, it is characterised in that：The clamping fixture seat（3）Including folder Tool set（32）, the fixture set（32）Top collet is installed（33）, in fixture set（32）Side wall on pass through fixing screws （31）With secondary clamping device（2）Block（23）It is fixedly linked, the fixture set（32）Side wall on be machined with sliding slot （321）, the sliding slot（321）With secondary clamping device（2）Thimble（211）Composition is slidably matched.