SU1716358A1 - Impact test stand - Google Patents

Abstract

This invention relates to a testing technique. The aim of the invention is to expand the operational capabilities of the stand by providing control of the amplitude and shape of the acceleration pulse. This is achieved by supplying the stand, which includes an accelerator device with an energy accumulator in the form of a pressure chamber and a plunger hermetically inserted into the pressure chamber, installed in the bottom of the pressure chamber with the possibility of axial mounting movements by a cylinder with several cavities insulated from each other a plunger with independent control of the operation of each part of the plunger. The stand contains a platform 1 for fastening the test article 2 connected to the stems 4 of the brake cylinders 5. The platform stem 11 enters the central opening of the plunger 7, hermetically inserted into the pressure chamber 6 of the housing 8. A pressurized cavity 9 is formed between the end of the plunger 7 and the bottom of the pressure chamber 6 in which the ends of the parts 12-14 of the telescopic plunger 15 are placed, the other ends of which are placed in isolated cavities 16-18 of the cylinder 22. When a control pressure is applied to the sealed cavity 9, the area of the end face of the plunger 7. The pressure that the accelerating plunger 7 will act on will depend on how much and how many parts of the telescopic plunger 15 will move together with the plunger 7. A stepwise change in the accelerating acceleration can also be provided when the telescopic plunger 15 moves off from the end of the plunger 7.1 Il. w o eat

Description

The invention relates to a test apparatus, in particular, to stands for impact testing of products, comprising an accelerating device comprising an energy accumulator in the form of a pressure chamber and a plunger which is hermetically inserted into the pressure chamber.

The purpose of the invention is the expansion of operational capabilities is achieved by providing a cylinder installed in the bottom of the pressure chamber with cavities isolated from each other, into which parts of a telescopic plunger with annular shoulders are hermetically inserted, and the ends of parts of a telescopic plunger and

the end of the plunger of the accelerating device placed in the sealed cavity is made with the possibility of forming hermetic contact pairs, which makes it possible to control the amplitude and shape of the acceleration pulse.

The drawing shows the proposed test stand.

The stand contains a platform 1 with a test article 2 installed on it, connected by means of hinges 3 to the rods 4 of the brake cylinders 5. The accelerating device including the pressure chamber 6 with the plunger 7 sealed into it, which separates the pressure chamber 6 inside the accelerating device 8 from the sealed cavity 9, which is connected to the pressure-controlling channels 10. The rod 11 of the platform 1 enters the central opening of the plunger 7 of the accelerating device. At the lower end of the plunger 7, the portions 12-14 of the telescopic plunger 15 rest, forming a sealed contact pair. Parts 12-14 of the telescopic plunger 15 are hermetically inserted into insulated cavities 16-18, housed in a cylinder 22, having the possibility of an installation movement in the axial direction (for example, using a helical gear 23). Case 8 accelerating device and brake cylinders 5 mounted on the base 24.

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The proposed percussion test bench works as follows.

In the pressure chamber 6, the necessary pressure is created (liquid or gas), while the necessary energy is accumulated here for the test.

In order to operate the stand, the sealed cavity 9 is connected via channel 10 with a source of control pressure. In this case, all isolated cavities 16-18 are connected to a drain or one of the cavities 16 and 17 or 18 with a pressure source, and the other two cavities communicate with the drain. The cavity 9 is depressurized, and the pressure existing in the pressure chamber 6 begins to act on the entire area of the plunger 7 end face (if all the cavities 16-18 are connected to the drain), or on its corresponding part (if one of the cavities 16.17 or 18 is fed pressure, and the other two cavities are connected to a drain). The piston 7 begins to accelerate moving upwards, passing through the platform 1 acceleration to the tested product 2. The platform 1 is braked by the brake cylinders 5. After the braking is completed, the stand is reset.

To create a step-shaped acceleration pulse, the cylinder 22, by moving in the axial direction, is placed in a position where, at the stage of acceleration of the plunger 7 with the corresponding part 12.13 or 14 of the telescopic plunger 15, it is separated from

the ram 7 of the accelerating device as a result of the interaction of the annular collar with the corresponding partition of the cylinder 22 dividing the isolated cavities 16-18.

The construction of the cylinder 22 located in the bottom of the pressure chamber 6 with the possibility of axial movement with several cavities isolated from each other and a telescopic plunger 15. of which parts 12-14 have annular

collars, which act to interact with partitions dividing cavities 16-18, allow testing of products with acceleration pulses of various amplitudes and shapes.

Claims (1)

Invention Formula Impact test bench containing base mounted on rod a platform for securing the tested product; an accelerating device mounted on the base, including an energy accumulator in the form of a pressure chamber and hermetically inserted into the pressure chamber a plunger, between the end of which and the bottom of the pressure chamber, is formed a sealed cavity to connect it to the source of control pressure, and brake cylinders, the rods of which are connected to platform, characterized in that, in order to expand operational capabilities by providing control of the amplitude and shape of the acceleration pulse, it is equipped with the bottom of the pressure chamber with the possibility of axial installation movement by a cylinder with several cavities isolated from each other, each communicating with an independent source of control pressure, and a telescopic plunger inserted with a seal into the cylinder, one end of each part of which is placed in a sealed cavity, and the other end is placed in one 5 of the insulated cavities and is provided with an annular shoulder serving to interact with the partition dividing the isolated cavities, wherein the ram end of the accelerating device and the ends The telescopic plunger parts accommodated in the sealed cavity are adapted to form airtight contact peers.