SU932199A1 - Device for measuring article deformation - Google Patents

Description

one

The invention relates to a measurement technique and can be used to measure the deformation of products during mechanical testing.

A strain gauge for measuring the deformation of products is known, which contains strain gauges and mounting prisms with centering screws and a squeezing mechanism mounted on one of the Cl prisms.

This strain gauge is of limited use due to the impossibility of measuring the deformation of specimens of different dimensions.

In addition, they do not allow them to be wound on a sample installed in the grippers of an executive machine.

Closest to the present invention is a device for measuring the deformation of products, containing two strain gauges with brackets and a mechanism for mounting the gauges on the product. The mechanism for mounting the gauges on the product consists of guide pins with hooks and gland springs 2.

A disadvantage of the known device is the low accuracy of strain measurement, due to the fact that when the gauges are installed on the product, the force of the tension of the pressure springs is not controlled and on different samples of the same batch

10 & 1 different, which does not provide repeatable results.

The purpose of the invention is to improve the measurement accuracy.

This goal is achieved by

Claims (2)

15 that in a device for measuring deformation, containing two strain gauges with brackets and a mechanism for mounting the gauges on the product, each bracket is provided with a groove at the free end and a side threaded hole, and the mechanism for mounting the gauges is made as a groove 3 9 bracket brackets with a support in the middle part of a screw mounted in a threaded one, the hole of one of the brackets and interacting with one end of the bracket, an adjustable spring designed to press the gauges, a guide studs for a spring disposed between the bracket support and its free one; end and passing through the hole of the other bracket, having a stop, and an eccentric cam mounted on the axis of the support and interacting with the stop bracket. The drawing shows the device installed on the product. A device for measuring the deformation of products contains two gauges 1 and 2 deformations with brackets 3 and 4. Each bracket 3 and 4 has a free end groove b and 6 a side threaded hole 7 and 8. Mechanisms for installing the gauges are designed as a bracket 9 with a support 10 in the middle part of the screw 11 installed in the threaded hole 8 of the bracket k and cooperating with the end 12 of the bracket 9, the adjustable spring 13, the guide pin I placed between the support 10 and the free end 15 of the bracket 9 and the opening 7 of the bracket 3 passing through the cutters having an emphasis 16, and eccent Cam 17 fixed to the axis 18 of the support and cooperating with the support 16 of the bracket 3. The eccentric cam 17 has a turning lever 19 and a return spring (not shown), under the action of which it is always in its original position (shown in the drawing). The compression of the spring 13 is carried out by the nut 20 before the installation of the device for. measuring the deformation of the product on the sample 21. Before installing the proposed device on the sample, adjustment work is carried out, which consists in the fact that the nut 20 installs a spring 13 preload, which provides the necessary force of the installation of the meters on the sample 21 Then the eccentric cam 17 is rotated around the axis 18, with This cam presses the stop 16, and through it the bracket 3 retracts the strain gauge 1 from the gauge 2, after which the screw 11 sets the distance between the gauges 1 and 2 according to the diameter of the test piece 21, so that it freely enters between the meters. The installation of the device on the sample is made by returning the eccentric cam 17 with the turn lever 19 to its original position. With this prism, the strain gauges (not shown) are pressed against the surface of the sample 21, and the stop 16 comes out of contact with the eccentric cam 17. The distance between the stop 16 and the eccentric cam 77 is the stroke of the meter 1 under the action of the spring 13. The device is adjusted for measuring the deformation of the product, it is possible to measure the deformation of any number of the same type of samples without additional adjustment of the installation force of the gauges on the sample, which allows to increase the accuracy of measurements and the duration of labor. An apparatus for measuring the deformation of products, comprising two strain gauges with brackets and a mechanism for mounting the gauges on a product, characterized in that, in order to improve the accuracy of the measurements, each bracket is made with a groove at the free end and a side screw hole, and a mechanism for mounting The gauges are made as a clamp bracket entering the grooves with a support in the middle part, a screw installed in the threaded hole of one of the brackets and interacting with one end of the bracket an adjustable spring intended to press the gauges; A spring stud for a spring placed between the bracket support and its free end and passing through the hole of another bracket having a stop and an eccentric cam fixed on the axis of the stop and cooperating with the stop bracket. Sources of information taken into account in the examination 1. USSR author's certificate number 315006, cl. G 01 B 7/16, 19b9. 2. Machines and instruments for testing materials. M., Metallurgists, 1968, p. (prototype). 1 Itf P 7 d 21t