SU1589119A1 - Installation for testing specimens for bending - Google Patents

Abstract

The invention relates to a testing technique and can be used when testing specimens for bending. The purpose of the invention is to expand the functionality. The installation comprises frame 1 with pairs of supports 2.3 and 4.5 with rollers 6.7 for sample 8. The supports are mounted on the ends of the coupled wheels 12.13 in such a way that their axes of rotation lie on the same straight axis wheel rotation. A frame 10 is mounted on the frame to load the sample. Wheels 12, 13 are associated with the drives for their rotation. When the wheels rotate 12.13, pairs of supports 2.3 and 4.5 alternately act on the sample, making reciprocating movements along the sample. At a constant rotation of the wheel 13 clockwise, the loading occurs at a sign-constant change in the curvature of the span, and at the reciprocating rotation of the wheels 12, 13 - at an alternating change of the curvature of the span, which expands the functionality of the installation. 2 Il.

Description

01/2. f

 The invention relates to test equipment, in particular to installations for testing specimens for bending.

The purpose of the invention is to expand the functional capabilities of the installation by providing tests for both alternating and constant sign cycles for changing the span between the axes of the supports.

FIG. 1 shows a diagram of a pre-: lagged installation; in FIG. 2 - the same top view.

I The installation contains a frame 1 with a loading mechanism placed on it, including two pairs of supports 2 and 3: and it and 5 with mounted, respectively, rollers 6 and 7 for image-: Tsa 8, and spring-loaded with help; springs 9 rod 10 with a load; in addition, on frame 1 there is an eccentric; risky drive reciprocating; displacement of supports 2 and 3 and 5; along sample 9 when tested, made in the form of interlocking wheels 12 and 13, the axes of rotation of which are parallel to each other and perpendicular to the axis of the rod 10, with the drive of the wheels of rotation 12 and 13. According to sled; made in the form of an electric motor; T +, kinematically connected with: using an eccentric 15, frame 16, rei; ki 17, gear wheel 18 and coupling | 19 with wheel 12, and electric motor 120, kinematically connected with: using coupling 21 with a wheel 13. When; This supports 2 and 3 J A and 5 are mounted Ipair on the face surface of the wheels 12 and 13 so that their rotation axes are located on one straight line passing through the axes of rotation of the wheels 12 and 13, and the stem 10 is set so that that its axis is located between the axles of the supports

The installation works as follows.

Sample 8 is mounted on rollers 6 and 7 when worn pads 22. To test when changing alternately, the span between the axles of supports 2 and 3 and A and 5 includes a clutch 19 and an electric motor 14. At the same time, the eccentric 15 uses frame 16, rails 17 and the wheels 18 notify the wheels 12 and 13 in a reciprocating rotation up to 180, as a result of which one of the pairs of supports 2 and 3 or t and 5 (depending on the direction of rotation of the wheels 12 and 13) performs reciprocating movements

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and the rod 10 loads the sample 8. The loading cycle consists of gradually increasing the span between the axes of a pair of supports 2 and 3 or 4 and 5 interacting with the sample 8 and gradually decreasing it. In this case, due to the deformation of the spring 9, a synchronous change in the load on the sample 8 occurs, and the relationship between the flexural span and the load is determined by the characteristic of the spring 9. When using the load 11, cyclic changes in the bending moment occur due to the modified flexure span of the specimen.

To carry out tests with a sign of changing the span between the axles of the supports. 2 and 3 and i and 5, turn off the clutch 19 and the electric motor I, and turn on the clutch 21 and the electric motor 20. At the same time, the wheel 13 is rotated clockwise for loading with a cyclically increasing span of bending. the arrow, as a result of which the supports (and 5 move to the ends of the sample 8 and lift the latter with a simultaneous increase in the span of the bend. The wheels 12 and 13 turn to 90, due to the deformation of the spring 9 the bending load increases (or does not change when 11). With further rotation of the wheels 12 and 13, the supports and 5 increase the span and lower the sample 8 with a decrease in load, and when they turn 180, the supports S and k leave the interaction with the sample 8. At the same time, the supports 2 and 3. Then the loading cycle is repeated.

Thus, placing the supports on the ends of the wheels of the eccentric drive when combining their axes of rotation with the straight through the axis of rotation of the wheels provides the opportunity to test both alternating and sign-constant cycles of change of the span between the axles of the supports, which expand em installation functionality.

Claims (1)

Invention Formula A bend test set containing a frame, a loading mechanism mounted on it, including a pair of supports with sample rollers, a spring-loaded rod, an axis which is located between the axes of the supports, designed to interact with the sample from the side, opposite supports, and kinematically associated with the supports eccentric drive of their reciprocating movement along the sample during the test, made in the form of wheels coupled to each other with a drive, the axes of rotation of the wheels are parallel to each other and perpendicular to the axis of the rod, characterized in that the purpose of extending the functionality by providing tests as with alternating signs as follows: and for sign-constant cycles of span change between the axles of the supports, the installation is equipped with an additional pair of supports with rollers, the supports are installed in pairs on the front surface of the wheels, respectively, so that their axes epauie are located on one straight through the axles of rotation of the wheels. 1