Hydraulic control circuit of winding mechanism

Abstract

The invention discloses a hydraulic control circuit of a winding mechanism. The winding mechanism comprises a winding rolling barrel (1), a first normally-closed-type brake (13), a reducer and a winding motor (2). An input end of the winding rolling barrel and an output end of the reducer are connected through a clutch (3). The first normally-closed-type brake is used for braking the winding rolling barrel, wherein a control opening of the first normally-closed-type brake is connected to a first electromagnetic reversing valve (12) through a braking oil channel; a first oil-supplying branch and a second oil-supplying branch are in parallel connection, and the first electromagnetic reversing valve is connected on a first pressure oil source (19) through the first oil-supplying branch and the second oil-supplying branch; the first pressure oil source selectively passes the first oil-supplying branch or the second oil-supplying branch to provide oil to the control opening of the first normally-closed-type brake; a control opening of the clutch (3) is connected to a second pressure oil source (17) through a clutch oil channel; and a second electromagnetic reversing valve (4) is in series connection with the clutch oil channel, and selectively ensures that the control opening of the clutch is communicated to the second pressure oil source or an oil tank. The first electromagnetic reversing valve and the second electromagnetic reversing valve are controlled through the same electrical switching. The hydraulic control circuit of the winding mechanism is high in reliability and construction safety.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a hydraulic control circuit of a winch mechanism. Background technique [0002] The hoisting mechanism of construction machinery (such as crawler cranes and dynamic compaction equipment, etc.) usually includes a hoisting drum, a reducer and a hoisting motor. The input end of the hoisting drum and the output end of the reducer are connected through a clutch, and the input end of the reducer The end is connected with the output end of the hoist motor, and the hoist motor is controlled by a hydraulic control circuit to drive the hoist drum. The clutch is usually a hydraulically controlled clutch. In the hydraulic control circuit of the existing winch mechanism, the clutch is usually controlled by a two-position three-way reversing valve. The working oil port of the reversing valve is connected with the control port of the clutch. The pressure oil port communicates with the pres...

AI Technical Summary

Problems solved by technology

The hoisting mechanism is usually manually operated by the operator. If the operator does not misuse according to the regulations, for example, when the hoisting mechanism needs to be lifted, the reversing valve that controls the clutch is misoperated, so that the control port of the clutch and the pressure oil source Connected, it will cause the clutch to disengage and cause a safety accident

Or, when the winch mechanism needs to be lowered freely, the reversing valve that controls the clutch is misoperated, so that the control port of the clutch is communicated with the oil tank, which will cause the clutch to engage and cause the clutch to wear

Therefore, the reliability and construction safety of the hydraulic control circuit of the existing winch mechanism are relatively low

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