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Rotary control valve unit, rotary control hydraulic system and crane

A hydraulic system and control valve technology, applied in the hydraulic field, can solve the problems of unstable load flow, unstable crane rotation and fretting, and unstable valve port pressure difference.

Active Publication Date: 2013-08-14
SANY AUTOMOBILE HOISTING MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The defect of the existing slewing control valve is that: the load pressure is not constant, resulting in the valve port pressure difference is not constant, resulting in unstable load flow, which changes with the change of the load, that is, the slewing speed of the crane on the car changes with the change of the load (such as the slewing clearance The size will affect the size of the slewing friction, which will affect the slewing fretting, and the weight of the load will also affect the slewing fretting, etc.), which will eventually make the slewing fretting of the crane unstable.

Method used

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  • Rotary control valve unit, rotary control hydraulic system and crane
  • Rotary control valve unit, rotary control hydraulic system and crane

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Embodiment Construction

[0035] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. Various preferred embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0036] In this document, unless otherwise specified, the orientation words such as left, right, upper, lower, and middle are determined based on the corresponding drawings. The following describes the embodiments provided by the present invention by taking a hydraulic system applied to a crane as an example.

[0037] Please refer to figure 1 , which is a schematic diagram of the principle of the rotary control valve group provided in Embodiment 1 of the present invention. The rotary control valve group includes a proportional reversing valve 2 , a shuttle valve 5 and a differential relief valve 7 . in:

[0038] The proportional reversing valve 2 can be an existing reversin...

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Abstract

The invention discloses a rotary control valve unit, a rotary control hydraulic system and a crane. The rotary control valve unit comprises a proportional reversing valve, a shuttle valve and a fixed-difference overflow valve, wherein two oil inlets of the shuttle valve are respectively communicated with two working oil ports of the proportional reversing valve, oil outlets of the shuttle valve are communicated with a second pressure sensing port of the fixed-difference overflow valve, a first pressure sensing port of the fixed-difference overflow valve is communicated with oil inlets of the proportional reversing valve, and overflow oil ports are communicated with an oil return path. Under the loading state, the two pressure sensing ports of the fixed-difference overflow valve sense the pressure of the oil inlets and the high-pressure working oil ports of the proportional reversing valve, when the difference of the two pressures is larger than a preset value, the overflow pressure of the fixed-difference overflow valve is correspondingly adjusted, part hydraulic oil of a high-pressure oil source enters the oil return path for decompression through the overflow oil ports of the fixed-difference overflow valve so as to stabilize the difference of oil pressure of the oil inlets and load pressure of the proportional reversing valve, accordingly the influence on flow of the high-pressure working oil ports caused by load pressure changing is reduced, and load flow stability is improved.

Description

technical field [0001] The invention relates to hydraulic technology, in particular to a slew control valve group, a slew control hydraulic system and a crane. Background technique [0002] Crane is a kind of engineering machinery capable of lifting, transporting and loading and unloading materials. It is widely used in construction sites, ports, oil fields, railways, warehouses, wind power and other working conditions for lifting and hoisting operations. Bridges, installation of power generation equipment, shipbuilding, erection of wind turbines, etc. Cranes play a very important role in reducing labor intensity, saving manpower, reducing construction costs, increasing construction weight, speeding up construction, and realizing engineering construction mechanization. In recent years, with the rapid development of the national economy, cranes have played an increasingly important role in many industries. The improvement of the performance of the crane is also more and mor...

Claims

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Application Information

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IPC IPC(8): F15B13/02F15B11/08
Inventor 侯敏刘正雷易迪升
Owner SANY AUTOMOBILE HOISTING MACHINERY
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