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Emergency descent valve bank

A valve group and pressure reducing valve technology, applied in servo motor components, fluid pressure actuating devices, servo motors, etc., can solve problems such as danger, motor cavitation, load drop, etc., to reduce energy consumption and weight , the effect of improving safety

Active Publication Date: 2016-05-11
SHANGHAI ZHENHUA HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Even if the motor AB port is connected and the hook head can be lowered after the brake is turned on, because the motor A port is dragged back by the load to generate high pressure, the pressure oil at the motor B port will leak from the motor and run into the oil tank. Cavitation occurs inside the load pulled, and the load will fall directly to cause danger

Method used

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  • Emergency descent valve bank

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Embodiment Construction

[0026] The above-mentioned features and advantages of the present invention can be better understood after reading the detailed description of the embodiments of the present disclosure in conjunction with the following drawings. In the drawings, components are not necessarily drawn to scale, and components with similar related properties or characteristics may have the same or similar reference numerals.

[0027] figure 1 The structure of the preferred embodiment of the emergency lowering valve group of the present invention is shown. See figure 1 In this embodiment, the motor-driven hoisting winch is taken as an example for illustration. The entire emergency lowering valve group includes a system for opening the brake and a system for realizing emergency lowering.

[0028] The emergency lowering valve group in this embodiment is externally connected to a motor 6 , a hydraulic brake 7 and an oil source. The oil source includes, for example, a pump 8 , a one-way valve 9 and a...

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Abstract

The invention discloses an emergency descent valve bank which is simple in structure, emergency descent can be achieved without additionally arranging a hook-headed balance weight, and the descent speed can be steplessly adjusted. According to the technical scheme, the valve bank is externally connected with a motor, a hydraulic brake and an oil source and internally comprises a throttling valve, a pilot operated directional control valve, a reducing valve, a one-way valve and a hand-directional valve; the throttling valve and the pilot operated directional control valve are connected to a first branch located at a high-pressure side end opening of the motor, and the reducing valve and the one-way valve are connected to a second branch of a low-pressure side end opening of the motor; and the hydraulic brake is connected with the motor, the first end of the hand-directional valve is connected to the first branch, the second end of the hand-directional valve is connected to the second branch, and the third end of the hand-directional valve is connected with the hydraulic brake.

Description

technical field [0001] The invention relates to the technical field of fluid transmission and control, in particular to a device for emergency lowering of a valve group when a main pump of a crane fails. Background technique [0002] When the main pump of the existing large-tonnage crane fails, the hook head cannot drop emergency under the action of gravity after the AB port of the motor is connected and the brake is turned on. The resistance makes it impossible to descend. [0003] The practice that has been adopted in the market is to design the counterweight of the hook head when designing, that is, to consider the weight of the hook head. After the motor AB port is connected, the hook head can overcome the resistance and drop under the action of gravity. This method increases the weight of the hook head. The weight of the hook head increases the energy consumption during lifting. [0004] Even if the motor AB port is connected and the hook head can be lowered after the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B11/08F15B13/04B66D1/08
CPCB66D1/08B66D2700/0133F15B11/08F15B13/025F15B13/0401F15B2211/205
Inventor 陈栋叶建华
Owner SHANGHAI ZHENHUA HEAVY IND
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