Hydraulic circuit for lifting load of hoisting equipment

By introducing a combination design of control valve and lowering brake valve into the hydraulic circuit of the lifting equipment, the problem of uncontrolled load when the hydraulic pipeline is broken is solved, the safe and controllable load drop is achieved, and the safety of the equipment is improved.

CN223254761UActive Publication Date: 2025-08-22SANT (CHANGSHA) HYDRAULIC CO LTD
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Patent Information

Application Number
CN202422186972.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-06
Publication Date
2025-08-22
Estimated Expiration
2034-09-06

AI Technical Summary

Technical Problem

In lifting equipment, the load drops uncontrollably when the hydraulic pipeline breaks, affecting the safety of the equipment.

Method used

A hydraulic circuit is designed, including the first and second hydraulic pipelines, a downward brake valve and a control valve. The connecting pipeline is blocked at the blocking position through the biasing device of the control valve. The valve core of the downward brake valve is switched to the open position when the pressure exceeds the preload force, allowing or blocking the flow of hydraulic oil to ensure safe control of the load.

Benefits of technology

When the hydraulic pipeline breaks, the lowering brake valve automatically switches to the blocking position to prevent the load from losing control and dropping, improve equipment safety, and ensure controllable operation of the load.

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Abstract

The utility model belongs to the field of hydraulic systems, and particularly relates to a hydraulic circuit for a lifting load of hoisting equipment, when the hydraulic circuit operates normally, especially when a first hydraulic pipeline is intact, control pressure applied to a descending brake valve is sufficient to overcome pre-tightening force of an elastic pre-tightening piece; on the contrary, if the first hydraulic pipeline is broken and the pressure in the first hydraulic pipeline is sharply reduced, the pressure of the control end of the descending brake valve is not enough to overcome the pre-tightening force of the elastic pre-tightening piece, at the moment, the valve element of the descending brake valve is switched back to the blocking position, the second hydraulic pipeline is blocked, and the load is prevented from being further reduced; therefore, the load can be safely prevented from being out of control and falling.
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