A speed limiting valve instantaneous flow characteristic testing device and testing method thereof

Abstract

The invention relates to a speed limit valve instantaneous flow rate characteristic testing device and method. An oil pressing port of a proportional variable pump (3) is communicated with an oil inlet of a proportional overflow valve (4), an oil port of a first pressure sensor (5) and an oil inlet of a gear flowmeter (6), ports P, T, A and B of an electromagnetic reversing valve (7) are sequentially communicated with an oil outlet of the gear flowmeter (6), an oil tank (1) and an oil inlet and an oil outlet of a to-be-tested speed limit valve (8), and the oil outlet of the to-be-tested speedlimit valve (8) is communicated with an oil port of a second pressure sensor (9); signal output ends of the first pressure sensor (5), the second pressure sensor (9) and the gear flowmeter (6) and signal input ends of the proportional overflow valve (4) and an amplifier (12) are sequentially connected with channels A / D-2, A / D-0, A / D-1, D / A-0 and D / A-1 of a data collection card (10), a signal output signal of the amplifier (12) is connected with a signal input end of the proportional variable pump (3), and a computer (11) is installed with the data collection card (10) and computer-aided testing software. The speed limit valve instantaneous flow rate characteristic testing device is high in testing accuracy, low in heat generation value and high in automation level.

Description

technical field [0001] The invention belongs to the technical field of hydraulic component testing. In particular, it relates to a device for testing instantaneous flow characteristics of a velocity limiting valve and a testing method thereof. Background technique [0002] The speed limiting valve is one of the key control elements of the hydraulic system, which is used to control the speed of the load drop and reduce the hydraulic shock formed by the lifting hydraulic cylinder at the end of the piston stroke. When the load speed suddenly increases, the speed limiting valve needs to respond quickly to reduce the passing flow, so as to control the load drop speed. The instantaneous flow characteristic test of speed limiting valve is an important means to measure its quality. At present, the instantaneous flow characteristics test of the speed limiting valve mainly adopts the multi-pump source scheme and the oil cylinder loading scheme. When using the multi-pump source sche...

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Problems solved by technology

When using the multi-pump source scheme to test the instantaneous flow characteristics, first close the outlet proportional throttle valve, and then suddenly open the proportional throttle valve to simulate a sudden increase in the flow rate through the speed limiting valve to be tested. This scheme is only applicable to a single oil return port Secondly, the proportional throttle valve at the outlet of the speed limiting valve to be tested is used to control the flow rate, and the proportional throttle valve forms a back pressure at the outlet of the speed limiting valve to be tested, which is different from the actual working condition of the speed limiting valve; The scheme uses the counterweight to simulate the load, which can simulate the actual working conditions, but the cost is high and it is dangerous

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