A rotary control valve, a rotary hydraulic system and construction machinery

A technology for controlling valves and rotary pumps, applied in mechanical equipment, cranes, fluid pressure actuating devices, etc., can solve the problems of no action of the main reversing valve core, no speed regulation, etc., and achieve large speed regulation range, low The effect of steady speed

Active Publication Date: 2022-04-19
XUZHOU HEAVY MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing rotary hydraulic system does not have speed regulation when the engine is at low speed and the maximum oil supply flow of the rotary system is small, or when the load is large, there is a phenomenon that the initial displacement of the main reversing spool does not move.

Method used

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  • A rotary control valve, a rotary hydraulic system and construction machinery

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Embodiment Construction

[0013] In order to better understand the essence of the present invention, the present invention will be further described below in conjunction with specific embodiments and accompanying drawings.

[0014] The invention provides a slewing control valve and a slewing hydraulic system, which are especially suitable for truck cranes.

[0015] Such as figure 1 As shown, the swing control valve 2 includes a main reversing valve 4, a relief valve, a charge check valve 6 and a shuttle valve 7. The relief valve is a fixed difference relief valve 5, wherein ports c1 and c2 are oil outlets, and port c3 is an oil inlet.

[0016] The main reversing valve 4 is a hydraulically controlled three-position six-way reversing valve, wherein a and b are control ports, ports d1 and d2 are oil inlets; ports d4 and d6 are oil outlets. The d1 port and the d2 port are respectively connected with the c1 port and the c2 port of the differential overflow valve 5 . Outside the main reversing valve 4, th...

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Abstract

The invention discloses a rotary control valve, which comprises a main reversing valve, an overflow valve, a one-way valve, a P port, an A port, a B port and an oil return port T; the oil inlet of the overflow valve and the P port The oil outlet is connected with the oil inlet of the main reversing valve; the oil outlet of the main reversing valve is connected with the A port and the B port respectively; the P port is the oil inlet of the rotary control valve, Ports A and B are the oil outlets of the rotary control valve; a check valve is provided between the oil circuit connected to the overflow valve and the main reversing valve; the main reversing valve communicates with the oil return port T. The invention can realize low and stable speed, has a large speed regulation range, and is not affected by the size of the load and the maximum flow of the pump.

Description

technical field [0001] The invention relates to a rotary control valve, a rotary hydraulic system and construction machinery, belonging to the field of construction machinery. Background technique [0002] The truck crane boarding mainly completes lifting, luffing, slewing, telescopic and other actions. The speed regulation of the slewing action is an important performance index of the truck crane, which mainly includes two aspects: the minimum stable slewing speed and the speed regulation range. During the use of the truck crane, due to the increasing number of precise installation conditions, the speed regulation requirements for the truck crane's slewing action are also increasing. However, the existing rotary hydraulic system does not have speed regulation when the engine is at low speed and the maximum oil supply flow of the rotary system is small, or when the load is large, there is a phenomenon that the initial displacement of the main reversing spool does not move. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B66C23/86B66C23/82B66C13/18F15B13/04F15B13/02
CPCB66C23/86B66C23/82B66C13/18F15B13/0401F15B13/027F15B13/028B66C2700/03
Inventor 东权焦国旺袁丛林周彬
Owner XUZHOU HEAVY MASCH CO LTD
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