SU1548680A1 - Exciter of pressure pulse to beds for testing shells - Google Patents

Abstract

This invention relates to a testing technique. The aim of the invention is to enhance the operational capabilities by providing the test shell under pressure after exposure to a pressure pulse. The pressure pulse exciter comprises a hammer 1 and a device for converting a mechanical shock into a pressure pulse. The latter includes a single-cylinder hydraulic cylinder 2 connected by line 3 with the test shell 4, a hollow piston 5 placed in the hydraulic cylinder 2, a cup 6 installed in the cavity of the piston 5, facing down to the hammer 1, a spring 7 placed between the bottoms of the cup 6 and piston 5, and clips 8 of the cup 6 mounted on the hydraulic cylinder 2 and passing through the longitudinal grooves 9 in the side wall of the piston 5. The adjusting screw 10 allows adjusting the pre-compression of the spring 7. Upon impact on the piston 5, the latter moves down, creating a pressure pulse and displacing fluid in the test shell 4. Spacers 8 provide an elastic fixing of the piston 5 in the lower position, whereby the test pressure does not drop to zero. 1 hp f-ly, 4 ill.

Description

The invention relates to a testing technique, in particular to pressure pulse exciters used in test stands for testing the shell against the effect of internal pressure.

The aim of the invention is to expand the operational capabilities by providing the test shell under pressure after exposure to a pressure pulse. The piston transferring the impact to the fluid, after the end of the impact, is spring-loaded in the lower position.

Figure 1 shows the proposed pressure pulse exciter | Fig. 2 shows the characteristic curve of the change. - the pressure in the test shell when using the exciter.

The pressure pulse exciter comprises a hammer 1 and a device for converting a mechanical shock into a pressure pulse, made in the form of a single-cavity hydraulic cylinder 2 connected by line 3 with the test shell 4 placed in cylinder 2 of a hollow piston 5, which serves to interact with a drummer installed in a CAMPER 5 a blade 6, facing down to the impactor 1, a spring 7 placed between the bottom of the bowl 6 and the bottom of the piston 5, and clamps 8 of the bowl 6, mounted on the hydraulic cylinder 2 and passing through the longitudinal grooves 9, A piston 10 is installed in the side wall of the piston 5. An adjusting screw 10 is installed in the bottom of the piston 5 facing the hammer 1, the end of which rests on the bottom of the glass 6. The compressor also includes a liquid compressor 11 with a pressure gauge 12, a plate 13 for fixing the test shell 4, pressure sensor 14 and indicator light 15

The pressure pulse exciter operates as follows.

Before testing, the supercharger 11 fills the hydraulic cylinder 2, line 3 and the test shell 4 with a fluid that controls the pressure gauge 12. The drummer 1 strikes the piston 5, which under the impact of the shock moves in the hydraulic cylinder 2 and creates an increasing pressure in the test shell 49 with clamps 8 slots 9 slides over glass 6 when piston 5 reaches the lowest point

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(FIG. 2, II), the clips 8 are extended and abutted against the end of the glass 6; By overpressure of the fluid created by the piston 5, the shell 4 is deformed with increasing volume, which is filled with fluid by moving the piston 5. Then the pressure of the fluid in the system, acting on the piston 59, moves it upwards (Fig. 2, III). In this case, the bottom of the piston 5 compresses the spring 1, the upper end abuts against the bottom of the glass 6, fixed by the clips 8 (Fig. 2, IV). The reaction of the spring 7 to the piston 5 reduces its speed of return to the upper position and reduces the length of the return stroke. Due to this, the trailing edge of the pressure change curve becomes flatter, and the pressure value in the test shell 4 when the piston 5 is stopped in the upper position exceeds the value created by the supercharger 11 before striking. Moving the adjusting screw 10 creates a preliminary compression of the spring 7, which ensures that the required pressure drop rate is reached during the return stroke of the piston 5. When the specified maximum pressure is reached in the test shell 4, the sensor 14 generates a signal to the indicator light 15.

The possibility of elastically fixing the piston 5 in the lower position makes it possible to create laws of pressure change in the test shell, close to the law of pressure change during the explosion of the gas-air mixture in the same shell, without using explosive mixtures. This increases the reliability and reduces the complexity and risk of testing.

Claims (2)

Invention Formula 1 o Pressure pulse exciter to test stands for shells containing a hammer and a device for converting a mechanical shock to a pressure pulse including a single-cavity hydraulic cylinder, the piston of which serves to interact with the hammer, and a spring interacting with the piston. , g the purpose of expanding operational capabilities through the provision of nasadrzhki shell under pressure after pressure is applied, it is provided with a cup that is installed in a cavity made in the piston and facing the drummer, and a glass retainer fixed to the cylinder body and passing through longitudinal grooves made in the side wall of the piston, and the spring is installed between the bottom of the glass and the bottom of the piston. 2. The pathogen according to claim 1, characterized in that it is provided with an adjusting screw mounted on the bottom of the piston facing the drummer, the end of which is resting on the bottom of the cup. Pfo P2 Tax 2 2 Pf const