A test bench hydraulic system for central swivel joints

Abstract

The invention discloses a test bench hydraulic system used for a central swivel joint. The test bench hydraulic system comprises a first high pressure pump, and a high pressure pump station, wherein an oil outlet of the first high pressure pump is connected to a system oil inlet way; an oil supply way is provided with a first switch valve; a system oil return way is provided with a second switch valve; an oil outlet of the high pressure pump station is connected to the system oil inlet way; the oil supply way is provided with a third switch valve; an electromagnetic overflow valve is arranged at the downstream of the second switch valve. Through the design mentioned above, the oil way where the high pressure pump station is can perform pressure loss test on the central swivel joint during the test, so that the flow is adjusted conveniently, a large-flow pressure loss test is realized, completeness of the pressure loss test is ensured, and reliability of the test result is improved.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a test bench hydraulic system for a central rotary joint. Background technique [0002] The central rotary joint is one of the important parts of construction machinery such as excavators, cranes, and truck-mounted cranes. As a component connecting two relatively rotating oil circuits, it can avoid torsion caused by relative rotation between hydraulic lines. Therefore, it is necessary to conduct various performance tests on the central rotary joint before it is put into use. [0003] When testing the central rotary joint, the mandrel and the shell of the central rotary joint rotate relatively, so it is impossible to test one oil channel of the central rotary joint alone, and at least two oil channels need to be connected in series. In practice, only the Two oil passages are connected in series, because the more oil passages are connected in series, the more difficu...

AI Technical Summary

Problems solved by technology

[0006] First, since the hydraulic system has only one high-pressure oil circuit and the hydraulic oil flow is small, it is impossible to conduct a large-flow pressure loss test during the pressure loss test, resulting in an incomplete test and a lack of credibility in the test results;

[0007] Second, since the hydraulic system only has one high-pressure oil circuit, it can only be tested on one set of oil channels (two oil channels connected in series) on the central rotary joint, and then the other groups of oil channels need to be tested one by one , the number of tests is more, and the test time is longer;

[0008] Third, because the switch valve of the high-pressure oil circuit is a slide valve, the leakage is large and the test results are inaccurate;

[0009] Fourth, the hydraulic system cannot perform pulse tests, and cannot test extreme working conditions such as the pressure loss of the central rotary joint

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