CN202562804U - Connecting device used in hydraulic cylinder fixture of fatigue testing machine - Google Patents

Abstract

The utility model discloses a connecting device that fatigue testing machine hydraulic cylinder anchor clamps used. The device comprises a clamping block (1) and a connecting block (2), wherein the clamping block (1) and the connecting block (2) are fixed by threads. Furthermore, the clamping block (1) is provided with a depth positioning block (3) for clamping depth positioning; the connecting block (2) is provided with a threaded hole for mounting a sample; the connecting devices need to be used in pairs; the upper clamp and the lower clamp of the testing machine respectively clamp one connecting device. The device has the advantages of reasonable design, simple structure, safe use, low cost, convenient assembly and disassembly, easy operation and better applicability and practical value.

Description

Connecting device used in hydraulic cylinder fixture of fatigue testing machine

technical field

The utility model belongs to physical test equipment for metal materials, and relates to the design and improvement of a barrel-type fixture of a fatigue test machine.

Background technique

For the axial fatigue performance test of metal materials, most of the equipment currently used are electro-hydraulic servo fatigue testing machines and electromagnetic resonance fatigue testing machines. Usually fatigue testing machine clamps have wedge clamps, flat push clamps and barrel clamps. The cylindrical clamp has the advantages of good coaxiality, no damage to the clamping teeth on the clamping surface of the sample, and long service life. It is currently widely used in imported high-end fatigue testing machines, such as INSTRON, Zwick, MTS and other high-end fatigue testing machines. Its disadvantage is that the specification range of the sample clamped by the fixture is narrow (the general range is -2mm of the marked specification), and it needs to be equipped with various specifications of fixtures to meet the requirements of different specifications of the sample test. Moreover, it is cumbersome to replace the cylindrical fixture, which is time-consuming and laborious. More importantly, the price of the testing machine fixture is relatively expensive, and the cost of purchasing various specifications of fixtures is relatively high.

Contents of the invention

The purpose of this utility model is: on the basis of using the barrel clamp of the testing machine, through the design and manufacture of the connecting device adapted to the clamp, it is applicable to various sample specifications, and has good practical value.

The technical scheme that the present invention adopts:

A connecting device used for a hydraulic cylinder fixture of a fatigue testing machine, the connecting device includes a clamping block (1) and a connecting block (2), the clamping block (1) and the connecting block (2) are fixedly connected by threads, and the clamping The diameter of the block (1) matches the fixture, and the connecting block (2) is provided with a threaded hole (4) for installing the sample.

Furthermore, the clamping block (1) is provided with a depth positioning block (3), and the depth positioning block (3) is designed integrally with the clamping block (1) for positioning the clamping depth of the clamp, and its diameter is larger than that of the clamping block diameter of.

In order to facilitate better tightening between the clamping block (1) and the connecting block (2), the edge of the connecting block (2) is trimmed, and the size of the thread in the connecting block (2) matches the diameter of the sample; according to the test Replace the connecting block (2) according to the size of the sample diameter.

The utility model has the advantages of: making full use of the testing machine fixtures of limited specifications, through the connection device, one specification of the fixture can be used for samples of various specifications through the transformation of the connection block in the connection device, effectively reducing the number of fixtures. purchase, reduce costs, save manpower, material resources and time, and improve detection efficiency.

Description of drawings:

Fig. 1 is the front view structure schematic diagram of device of the present invention;

Detailed ways

The present invention will be further elaborated below in conjunction with accompanying drawing: the connecting device that the fatigue testing machine hydraulic cylinder type fixture as shown in the accompanying drawing uses comprises clamping block 1 and connecting block 2, and clamping block 1 and connecting block 2 are fixedly connected with screw thread, The clamping block 1 is provided with a depth positioning block 3, and the depth positioning block 3 can limit the clamping depth. The connecting device needs to be used in pairs, and the clamping block 1 and the connecting block 2 should be tightened. In order to facilitate the tightening of the two, the connecting block 2 can be used with chamfering. The sample is clamped in the threaded hole 4 of the connection block 2. When performing tension and compression fatigue, the sample should be screwed tightly in the threaded hole 4, and the connection block 2 can be replaced according to the sample specification. For example, if the sample diameter is 16mm, replace the connection block 2 so that the diameter of the threaded hole 4 in the connection block 2 is 16mm, and if the sample diameter is 20mm, replace the connection block 2 with a threaded hole with a diameter of 20mm. The connection devices are used in pairs, one for the upper and lower clamps of the testing machine.

Claims (2)

1. A connecting device used for a fatigue testing machine hydraulic cylinder clamp, characterized in that: the connecting device comprises a clamping block (1) and a connecting block (2), and the clamping block (1) and the connecting block (2) are used Threaded fixed connection, the connecting block (2) is provided with a threaded hole (4). 2. The connecting device used for the hydraulic cylinder clamp of the fatigue testing machine according to claim 1, characterized in that, the clamping block (1) is also provided with a depth positioning block (3).

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