SU1183854A1 - Bed for testing rubber-fabric diaphragms - Google Patents

Abstract

STAND FOR TESTING RUBBER DIAFRAGM, containing brake Hbie chambers with spring-loaded springs with spring-loaded rods installed, a distribution-regulating mechanism for pulsing the working medium into the brake chambers and its discharge and a source of working medium pressure, communicating with the distribution-regulating mechanism, distinguishes and so that, in order to raise. precision imitation of operating conditions, it is equipped with an adjustable valve installed on the line of discharge of the working medium from the distribution and control mechanism, and in the brake chambers of the diaphragm are installed in pairs with their brushes towards each other.

Description

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four; I The invention relates to testing equipment, as well as to stands for resource, comparative or control tests of rubber-fabric diaphragms of brake systems of automobiles and tractors, the purpose of the invention is to improve the accuracy of simulating the conditions of operation of diaphragms by creating a counter pressure loading that simulates the load on the test diaphragm arising at the time of braking. FIG. 1 is a schematic diagram i of a test bench for rubber-fabric diaphragms; in fig. 2 - brake chambers with test diaphragms, general view: in section. The stand contains brake chambers 1 with diaphragms 2 installed in them, a distribution-regulating mechanism including an electric actuator 3, a gearbox 4, eccentric pushers 5 located in antiphase on the output shaft of the gearbox 4, a brake crane 6, distribution columns 7. The mechanism communicates with the source of pressure of the working medium is the receiver 8, which has a rel 9 minimum pressure, which serves to shut off the stand when the pressure drops below the permissible pressure. An adjustable valve 10 is installed on the discharge lines of the distribution mechanism. Diaphragms 2 in the brake chamber 1 are installed in pairs with their brushes 1 opposite one another. The rods 11 are loaded with springs 12. The brake chambers I are mounted on racks 13 (in Fig. 2, the position corresponds to the end of the stroke of the right-hand shaft stroke, where P (is the pressure in the cavity of the brake chamber, which creates a loading force on the test diaphragm, and Pr is the pressure installed at the outlet of the adjustable valve 10, which creates a back pressure force.) The test of diffraction is carried out as follows. Compressed air from the receiver 8 through the brake valve 6 enters one of the distribution columns 7 and through the pipes 14 into the brake pipes measures 1 and drives rubberized diaphragms 2, 4 into motion, which press on the rods 11 of the brake chambers 1. At the next moment, the eccentric pusher 5 opens the compressed air through the brake valve 6 to another distribution column 7. The direction of movement of the tested rubber diaphragms 2 and Pggock 11 is reversed. The compressed air from the cavity of the brake chambers 1 and the distribution column 7, which fills them at the previous moment, is squeezed through the adjustable valve 10 into the atmosphere and creates the necessary force against pressure applied to rubber-diaphragm test. The next time the direction of movement of the diaphragms reverses and the test cycle repeats. After stopping the stand and shutting off the air of the diaphragm with the help of springs 12, they occupy the initial position. The stand design allows testing all sizes of rubber-fabric diaphragms in different modes. The bench allows you to accurately and for a long time simulate the load on the tested rubber-fabric diaphragms that occur at the time of braking. Rubber cloth diaphragms are tested under the same conditions. If necessary, change the magnitude of the load (adjustable valve) and the intensity of loading (changing the gear ratio of the electric drive-reducer), you can set different test modes. The stand design allows simultaneous testing of an even number of diaphragms. Using several pairs of distribution columns connected in pairs with the outputs of the brake valve, racks with brake chambers connected by a pair of distribution columns, and an appropriate receiver, you can simultaneously test a large number of diaphragms, slightly increasing the dimensions of the stand, which will allow for resource, comparative or reference tests. a large batch of rubber-fabric diaphragms, the results of which can be used to judge the quality and reliability of these products.

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Claims (1)

'' A STAND FOR TESTING RUBBER-TISSUE DIAPHRAGMS, containing brake chambers with diaphragms installed in them with spring-loaded rods, a distribution-regulating mechanism for pulsed supply of a working medium to brake chambers and its pressure source of a working medium, communicated with a distribution-regulating mechanism, distinguishing and I with that in order to increase. accuracy of simulating operating conditions, it is equipped with an adjustable valve installed on the line for discharging the working medium from the distribution-control mechanism, and in the brake chambers the diaphragms are installed in pairs with their rods facing one another.