Crane and hoist braking control system thereof

Abstract

The invention discloses a crane and a hoist braking control system thereof. The control system comprises a winch motor, a hoist brake and a controller, wherein the hoist brake is communicated with a falling port of the winch motor and is also communicated with a braking oil inlet way or a braking oil drainage way by a directional control valve; an oil way communicated with a start port of the winch motor is provided with an oil pressure sensor; and the controller is configured to output a first signal for controlling to switch the directional control valve to enable the hoist brake to be communicated with the braking oil inlet way according to a signal of the oil pressure sensor and output a second signal for controlling to switch the directional control valve to enable the hoist brake to be communicated with the braking oil drainage way according to a signal representing the end of hoisting a weight. Therefore, when the weight is hoisted, the hoist brake can be started after a hydraulic system sets up a certain pressure, i.e., start time of the hoist brake can be controlled, so that secondary falling of the weight, which is generated when the weight is hoisted, is effectively avoided.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a winch braking control system for a crane. In addition, the present invention also relates to a crane comprising the above-mentioned hoist braking control system. Background technique [0002] During the working process of the crane, the hoisting system is responsible for lifting or lowering the heavy objects. During this process, it is often necessary to temporarily stop the heavy objects at a certain height for a period of time. Whether the braking of the hoisting system can stabilize the heavy objects Staying in the air plays a decisive role. [0003] In existing hoisting machinery, when heavy objects are lifted or dropped, the hoist brake all takes oil from the main oil circuit. Such as figure 1 as shown, figure 1 It is the hydraulic schematic diagram of the winch braking control system in the prior art. [0004] Under normal conditions, the hoist brake 12...

AI Technical Summary

Problems solved by technology

[0006] When the heavy object is lifted or dropped, the hoist brake 12 takes oil from the main oil circuit of the hydraulic system, and the opening time of the hoist brake 12 cannot be controlled; when the heavy object is lifted, the hydraulic system does not establish a certain pressure, that is, the hoist The driving torque of the hoist motor 11 is not fully formed, because the opening time of the hoist brake 12 cannot be controlled, if the hoist brake 12 is turned on at this time, it is easy to cause the secondary fall of the heavy object;

[0007] The hoist brake 12 has no separate oil drain circuit, and the oil drain is slow. After the heavy object falls, the hoist brake cannot drain the oil in time to realize the braking of the hoist motor 11, which will cause the heavy object to continue to fall, and in severe cases, a stall phenomenon will occur

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