RU216636U1 - Cyclic Load Testing Device - Google Patents

Abstract

The utility model relates to the construction industry and can be used for mechanical testing of wooden elements for short-term or long-term cyclic loads. The utility model can be used to control the quality of wooden elements and determine the mechanical characteristics of the material under cyclic loading. The technical objective of the utility model is to expand the range of applied test loads. The technical result is achieved by using supports for the test sample in the structure, which prohibit the movement of the supporting parts of the sample up and down in the vertical direction. 2 ill.

Description

The utility model relates to the construction industry and can be used for mechanical testing of wooden elements for short-term or long-term cyclic loads. The utility model can be used to control the quality of wooden elements and determine the mechanical characteristics of the material under cyclic loading.

A device for testing wood for endurance is known (RU, patent for utility model No. 209867, published on March 23, 2022, Bull. No. 9) useful model "Device for testing wood for endurance", which also allows you to test wooden samples for cyclic loading.

The disadvantage of this device is the inability to create alternating loads on the sample.

The technical task of the utility model is to be able to test wooden elements with sign-constant and sign-alternating long-term cyclic loads.

The technical result is achieved by using supports for the test sample in the design, which prohibit the movement of the supporting parts of the sample up and down in the vertical direction.

In FIG. 1 shows a side view of the device;

in fig. 2 shows a top view.

The device consists of a frame 1, to which the support of the lever 2 is attached, the lever 3 is connected to the support of the lever 2 by means of a swivel, a stop 4 is installed on the lever. The table 5 for the test sample and the sample itself 6 are located on the frame. support table 5 detachable support 7. An eccentric vibration exciter 8 is rigidly fixed on the movable lever 3, which is a rotating axis with a load eccentrically fixed on it (the weight of which can be changed). The eccentric oscillation exciter 8 is driven by an electric motor 9 with a gearbox 10 using a flexible shaft 11. The flexible shaft 11 is attached to the gearbox shaft, as well as the shaft of the eccentric oscillation exciter using clamps 12. The lever is also equipped with a cycle counter (revolutions) 13. To create For the static component of the load on the sample, weights 14 are used, which are fixed on the lever 3. A limiter 15 with a limit switch 16 is installed on the frame 1, which serves to automatically turn off the power to the electric motor after the destruction of the sample.

The device works as follows.

A sample 6 is installed on the support table 5 and fixed in detachable supports 7, the selected load is fixed on the shaft of the eccentric vibration exciter 8 and the selected load 14 on the lever 3. The load 14 creates a constant component of the load through the lever. Voltage is applied to the electric motor 9, which drives the gearbox 10, which, in turn, through the flexible shaft 11 rotates the eccentric vibration exciter 7. Due to the rotation of the shaft of the eccentric vibration exciter 7, a variable load component arises on the movable lever 3 and the lever transmits load on the test sample 6. As a result, after a certain number of cycles (taken into account by the cycle counter 13), the sample 6 is destroyed and the lever 3 is lowered onto the limiter 15, pressing the limit switch 16. After that, the engine stops and the test is completed.

The installation for testing for cyclic load allows you to create an alternating load during testing. Also, the installation is small.

Claims (1)

A device for testing for cyclic load, containing a table for the test sample, a frame with a support, on which a movable lever with a stop is mounted by means of a hinge joint, with an oscillation exciter fixed on the lever, which is driven by an electric motor with a gearbox, which rotates an eccentric exciter through a flexible shaft oscillations, while a cycle counter is installed on the lever, as well as a limiter with a limit switch, characterized in that a detachable support for the test sample is rigidly fixed on the test table.

Images