SU977979A1 - Stand for bellows-testing - Google Patents

Description

The invention relates to testing equipment, namely, stands for fatigue testing of bellows.

A stand for fatigue testing of bellows is known, comprising a fixed support for fixing the end of the test bellows, guides mounted at an angle to the fixed support moving into the guide rod, a movable support cooperating with the STOCK, and a drive for reciprocating movement of the rod 1.

A disadvantage of the known stand is that it does not allow independent loading of the bellows with axial and shear forces.

The closest to the proposed technical entity is a fatigue test of bellows, containing mobile and fixed supports for mounting the ends of the test bellows, the drive of the reciprocating movement of the mobile support in the plane perpendicular to the axis of the bellows, the pressure source connected to the inner cavity of the bellows, and means of adjusting the pressure in the bellows 2.

The disadvantage of this test bench is the impossibility of conducting fatigue tests under independent effects of shear and axial loads: In this case, the bellows is loaded only with a shearing force and internal pressure.

The purpose of the invention is to enhance the functional capabilities of the stand by creating various forms of complex loading cycles.

ten

The goal is achieved by the fact that the stand is equipped with a rod fixed at one end of the bellows, which is installed in a movable support with the possibility of axial movement and

15 is spring-loaded in the direction of the fixed support.

FIG. 1 shows the proposed stand, section; in fig. 2 - the same, top view.

20

The stand contains a base 1, on which a fixed 2 and a movable 3 support are mounted, which are used to attach the ends of the tested bellows 4 to them, the drive 5 of reciprocating movement of the movable support 3 in the plane, perpendicular to the axis of the bellows 4, the pressure power source connected bellows inner cavity 4, and adjustment means

Claims (2)

30 pressure in the bellows 4 with a control system for this pressure (not shown) The movable support 3 is made with a pilot hole 7 in which the rod 8 is mounted with axial movement, fastened to the end of the test bellows 4. The rod 8 is spring-loaded in the direction to fixed spring 2 spring 9. Between the movable 3 and the fixed 2 legs are installed the gi 10, pivotally connected to the supports 2 and 3. To carry out tests in the mode of specified deformations, adjustable stops are fixed to the rod 8 on both sides of the mobile support 3 11 and 12, contactors (not shown), which are included in the pressure control system in the bellows 4. Similar stops 13 are fixed on the base 1 on both sides of the movable support 3 in the plane perpendicular to the axis of the bellows 4. They serve to initiate contacts in the control circuit of the actuator 5 (not shown) of the reciprocating movement of the movable support 3, the Stand also contains a nut 14 and a screw 15, which serve to adjust the pressing force of the spring 9. The stand operates as follows. Before the tests, depending on the chosen ratio of deformations in the loading cycle, gaps are established between the movable support 3 and the stops 11-13, corresponding to the values specified for shear deformation and compression in the bellows. If it is necessary to set the compression deformation B to the loading cycle of the bellows 4, preload the spring 9, select the gap between the movable support 3 and the stops 12. Simultaneously, the drive 5 of the reciprocating movement of the movable support 3 and the pressure source b are connected. The actuator 5, by moving the support 3, creates in the bellows 4 shear deformations, and the increased extension inside the bellows 4 - tensile deformations, as the rod 8 moves c in the guide hole 7 under the action of the pressure force. stops 11 and 13. After the contacts stop, the stop 13 rotates the actuator 5 to reverse and the movable support 3 returns to the neutral position, the actuator 5 turns off, at the same time the stop 11 closes the contacts in the pressure control system in the bellows 4 and the pressure in it P At the same time, the free end of the bellows 4, fastened to the rod 8, is moved, choosing the gap between the movable support 3 and the stops 12, which is equal to the amount of compression deformation. The loading cycle is then repeated with the movement of the movable support 3 to the right of the longitudinal axis of the bellows 4, creating a shear deformation of another sign. The proposed stand allows one to test the bellows under various loading conditions, namely, with symmetric and asymmetric cycles for tensile and shear deformations, as well as cycles for the joint and separate effects of these deformations. Claims for fatigue testing of bellows containing movable and fixed supports for fastening the ends of the test bellows, driving the reciprocating movement of the movable support in a plane perpendicular to the axis of the bellows characterized in that, in order to extend the functionality by creating various forms of complex loading cycles, it is equipped with The boom has a boom that is installed in the movable support with the possibility of axial movement and is spring-loaded in the direction of the fixed support. Sources of information taken into account during the examination 1. USSR author's certificate number 328361, cl. G 01 M 13/00, 1978. 2. USSR Author's Certificate No. 340934, cl. G 01 N 3/34, 1970 (prototype). It 10 8 b b Fng.2