Hydraulic closed type flushing loop

Abstract

The invention relates to a hydraulic closed type flushing loop and belongs to the technical field of hydraulic equipment. The hydraulic closed type flushing loop comprises a hydraulic oil pump, a hydraulic motor, a hot oil shuttle valve and a speed adjustment valve. An opening A of the hydraulic oil pump communicates with an opening A of the hydraulic motor and a first oil inlet A of the hot oil shuttle valve. An opening B of the hydraulic oil pump communicates with an opening B of the hydraulic motor and a second oil inlet B of the hot oil shuttle valve. An oil outlet T of the hot oil shuttlevalve communicates with an oil inlet P of the speed adjustment valve. An oil outlet T of the speed adjustment valve communicates with a first oil drainage opening of the hydraulic motor. A second oildrainage opening of the hydraulic motor communicates with a hydraulic oil tank. After a closed type system is started, the nominal flushing flow can be generated no matter whether people operate thesystem or not; when the hydraulic motor is at the high position, part of hydraulic oil enters a shell of the hydraulic motor after start, and dry rubbing is avoided; the defect that heating cannot beconducted after start can be avoided; the flushing flow is forced to be constant through the speed adjustment valve; and the problem that the flushing flow is excessively large when a high-pressure oil opening A and a high-pressure oil opening B are switched rapidly can be avoided.

Description

technical field [0001] The invention relates to a hydraulic closed flushing circuit, which belongs to the technical field of hydraulic equipment. Background technique [0002] The current hydraulic closed flushing circuit such as image 3 As shown, the middle position of the hot oil shuttle valve is that the high pressure oil port A, the high pressure oil port B and the oil outlet T port are all unconnected, and the hot oil shuttle valve is directly connected in series with the hydraulic oil tank with a relief valve. [0003] When the hydraulic motor is at a high position, due to the siphon phenomenon, the motor casing may lack oil. When rotating at high speed, it will cause dry grinding due to lack of oil, which will easily damage the motor; when the machine is just started for construction in extremely cold regions, the oil in the closed circuit cannot be circulated and heated. ;When the closed circuit high-pressure oil ports A and B are switched quickly, due to the hyster...

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Problems solved by technology

[0003] When the hydraulic motor is at a high position, due to the siphon phenomenon, the motor casing may lack oil. When rotating at high speed, it will cause dry grinding due to lack of oil, which will easily damage the motor; when the machine is just started for construction in extremely cold regions, the oil in the closed circuit cannot be circulated and heated. ;When the closed circuit high-pressure oil ports A and B are switched quickly, due to the lag of the hot oil shuttle valve, the flushing flow will be too large

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