CN-224228982-U - Multifunctional pump source of hydraulic valve

CN224228982UCN 224228982 UCN224228982 UCN 224228982UCN-224228982-U

Abstract

The utility model discloses a multifunctional pump source of a hydraulic valve, which comprises two-position three-way electromagnetic valves, a proportional overflow valve, a safety overflow valve and a pilot proportional direction valve, and is characterized by further comprising an Ls electric override load sensitive pump, wherein a constant frequency motor is arranged between the Ls electric override load sensitive pump and the Ls electric override load sensitive pump, an inlet of the Ls electric override load sensitive pump is communicated with an oil tank, an outlet of the Ls electric override load sensitive pump is connected with the pilot proportional direction valve, a C port of the first two-position three-way electromagnetic valve is connected with an Ls port of the Ls electric override load sensitive pump, an A port of the first two-position three-way electromagnetic valve is connected with an outlet of the pilot proportional direction valve, a B port of the first two-position three-way electromagnetic valve is connected with a feedback port of the tested valve Ls, a C port of the second two-position three-way electromagnetic valve is connected with an P1 port of the Ls electric override load sensitive pump, and an A port of the second two-position three-way electromagnetic valve is connected with an inlet of the pilot proportional direction valve. The test bed can be compatible with the testing of various hydraulic valves such as overflow valves, has high adjusting precision, and eliminates the influence of pipeline pressure loss on the testing result.

Inventors

WANG YINGZHOU
ZHANG CHEN
Jing Dengjie
BAI QINGPENG
TANG CHENGJIANG

Assignees

贵州安飞精密制造有限公司

Dates

Publication Date: 20260512
Application Date: 20250611

Claims (5)

1. The multifunctional pump source of the hydraulic valve comprises a first two-position three-way electromagnetic valve (3), a second two-position three-way electromagnetic valve (5), a proportional overflow valve (2), a safety overflow valve (6) and a pilot proportional directional valve (4) with an outlet connected with a test bed system, and is characterized by further comprising an Ls electric override load sensitive pump (1) and a fixed-frequency motor (8) arranged with the Ls electric override load sensitive pump; The inlet of the Ls electric override load sensitive pump is communicated with the oil tank, and the outlet of the Ls electric override load sensitive pump is connected with the pilot proportional directional valve; The port C of the first two-position three-way electromagnetic valve is connected with the port Ls of the Ls electric override load sensitive pump, the port A of the first two-position three-way electromagnetic valve is connected to the outlet of the pilot proportional directional valve, and the port B is connected with the feedback port of the tested valve Ls; The port C of the second two-position three-way electromagnetic valve is connected with the port P1 of the Ls electric override load sensitive pump, the port A is connected with the inlet of the pilot proportional directional valve, and the port B is connected with the port P of the tested valve.
2. The hydraulic valve multifunctional pump source according to claim 1, wherein an Ls electric override control valve (9) and a load sensitive compensation valve (10) are integrated in the Ls electric override load sensitive pump (1), the Ls electric override control valve is a proportional pressure reducing valve, and the Ls electric override control valve is used for completing the working pressure difference adjustment of the Ls electric override load sensitive pump.
3. The multifunctional pump source of the hydraulic valve according to claim 1, wherein the safety relief valve (6) is arranged at the outlet of the Ls electric override load sensitive pump (1), the outlet of the safety relief valve is connected with a flow switch (7), and the pressure of the safety relief valve is higher than the rated working pressure of the test bed.
4. A hydraulic valve multifunction pump according to claim 3, characterized in that the proportional relief valve (2) is arranged at the Ls port of the Ls electrical override load sensitive pump (1), the rated pressure of the proportional relief valve being lower than the set pressure of the safety relief valve (6).
5. The hydraulic valve multifunctional pump source according to claim 1, wherein the first two-position three-way electromagnetic valve (3) and the second two-position three-way electromagnetic valve (5) are zero leakage electromagnetic valves capable of bidirectionally flowing.

Description

Multifunctional pump source of hydraulic valve Technical Field The utility model relates to a hydraulic transmission pump source technology, in particular to a multifunctional pump source of a hydraulic valve. Background In the hydraulic valve test bed, the tested hydraulic valves are various, including pressure valves, multi-way valves and the like, and typical factory test items include steady-state pressure-flow characteristic tests, pressure loss tests, flow inching tests, output flow-input signal characteristic tests under constant pressure drop, internal leakage tests and the like. When the steady-state pressure-flow characteristic test and the pressure loss test are carried out, the pump source is required to be in an electric proportional variable pump working mode and can accurately regulate the flow, when the constant-pressure-drop output flow-input signal characteristic test is carried out, the pump source is required to be in a load sensitive variable pump working mode, and when the internal leakage detection test is carried out, the pump source is required to be in a constant-pressure variable pump working mode and can remotely regulate the constant-pressure. In view of the above requirements, the hydraulic valve test stand pump source is required to have extremely high flexibility so as to be compatible with various test projects of various hydraulic valves. The working pressure difference of the load sensitive multi-way valve is different due to different working conditions, and when the output flow-input signal characteristic test is carried out under constant pressure drop, the pressure difference of the pump source is required to be adjusted according to the working pressure difference of the multi-way valve. In the prior art, the flow compensation valve of the pump can only be manually adjusted, and the test result is directly influenced due to the fact that the energy pump is far away from the tested multi-way valve. Meanwhile, in the case of performing test items such as hydraulic valve pressure loss detection, it is necessary to accurately and rapidly control the pump source flow rate. In the prior art, a variable frequency motor is adopted to control a load sensitive variable pump to realize flow regulation, and the control precision is low and the response is slow due to the influence of the low-speed performance of the load sensitive variable pump and the lifting speed time of a frequency converter. At present, no test bed energy source can comprehensively meet the requirements, and automatic and rapid switching of the working mode is realized. Disclosure of Invention The utility model aims to solve the problems and provide a multifunctional pump source of a hydraulic valve and a control switching method thereof, which have the characteristics that the pump source of a test bed can be basically compatible with power source supply of various hydraulic valves and the like. The technical problem is mainly solved by the technical scheme that the hydraulic valve multifunctional pump source comprises a first two-position three-way electromagnetic valve, a second two-position three-way electromagnetic valve, a proportional overflow valve, a safety overflow valve and a pilot proportional directional valve with an outlet connected with a test bed system, and is characterized by further comprising an Ls electric override load sensitive pump, and a fixed-frequency motor is arranged with the Ls electric override load sensitive pump. And an inlet of the Ls electric override load sensitive pump is communicated with the oil tank, and an outlet of the Ls electric override load sensitive pump is connected with the pilot proportional directional valve. And the port C of the first two-position three-way electromagnetic valve is connected with the port Ls of the Ls electric override load sensitive pump, the port A of the first two-position three-way electromagnetic valve is connected to the outlet of the pilot proportional directional valve, and the port B is connected with the feedback port of the tested valve Ls. The port C of the second two-position three-way electromagnetic valve is connected with the port P1 of the Ls electric override load sensitive pump, the port A is connected with the inlet of the pilot proportional directional valve, and the port B is connected with the port P of the tested valve. In the hydraulic valve multifunctional pump source, preferably, an Ls electric override control valve and a load sensitive compensation valve are integrated in the Ls electric override load sensitive pump, wherein the Ls electric override control valve is a proportional pressure reducing valve, and the Ls electric override control valve is used for completing the working pressure difference adjustment of the Ls electric override load sensitive pump. In the hydraulic valve multifunctional pump source, preferably, the safety overflow valve is arranged at the outlet of the Ls electric override load sen