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Main valve and hydraulic control system thereof

A main spool and telescopic control technology, applied in the hydraulic field, can solve problems such as the inability to realize the hoisting function, a large number of pump sets, and high cost, and achieve the effects of rich functions, simplified pipeline layout, and small pressure loss

Inactive Publication Date: 2018-05-18
XUZHOU HEAVY MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The telescopic and luffing systems of large-tonnage hoisting machinery generally adopt an open pump-controlled hydraulic system, while the winch adopts a closed system. The cartridge-type main valve selected by the system can only meet the logical switching of telescopic and luffing actions, and cannot realize The hoisting function requires two separate pumps to control the hoisting action, the number of pump sets is large, the cost is high, and the weight is heavy
Existing cartridge master valves such as figure 1 As shown, the P1 and P2 oil ports are respectively connected to two oil pumps, the P3, P4, and P5 oil ports are used to control the telescopic action, and the P6, P7, P8, and P9 are used to control the luffing action. The switching of the width action, the action of the main and auxiliary winches needs a separate oil pump to perform

Method used

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  • Main valve and hydraulic control system thereof
  • Main valve and hydraulic control system thereof

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0029] Construction cranes mainly have four actions: luffing, telescopic, main hoisting, and auxiliary hoisting. Small-scale hoisting machinery mostly uses valve-controlled hydraulic systems, while large-scale hoisting machinery has a large flow rate in the system, and ordinary spool-type main valves cannot To meet the demand, the pump control system is often used, and four oil pumps are used to drive the four movements of the crane. The utilization rate of each oil pump is low, the weight of the pump unit is high, and the cost is high. Therefore, with the development of the industry, there is an urgent need for a cartridge-type main valve with logic control function, which can use two oil pumps...

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Abstract

The invention discloses a main valve and a hydraulic control system thereof. The main valve comprises a logic switching module, an amplitude-change control module, a pressure selecting module and a telescopic control module; the amplitude-change control module is used for realizing an amplitude-change action; the telescopic control module is used for realizing a telescopic action; the logic switching module is used for realizing the switch of the amplitude-change action and the telescopic action; and the pressure selecting module automatically matches the current system pressure value according to the telescopic action and / or amplitude-change action performed by the telescopic control module and / or the amplitude-change control module. The main valve is large in oil mass and small in pressure loss, and the hydraulic control system of the main valve can simplify piping layout of the hydraulic system.

Description

technical field [0001] The invention relates to a main valve and its hydraulic control system, belonging to the technical field of hydraulic pressure. Background technique [0002] The hydraulic system of small and medium-sized tonnage cranes generally adopts a valve-controlled hydraulic system. The action of each actuator is realized by controlling the opening of the spool-type main valve. However, the rated flow rate of the main valve in this form is usually within 400L / min. The open pump control hydraulic system is adopted, and the system flow rate is above 700L / min, so only the cartridge valve can be used to realize the logic function. The cartridge type main valve has a large flow rate, but it is difficult to realize compound action. Therefore, for a long time, large-scale hoisting machinery can only realize the compound action of hoisting machinery by increasing the number of oil pumps. [0003] The telescopic and luffing systems of large-tonnage hoisting machinery ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B13/02
CPCF15B13/021
Inventor 王守伟王冬任印美戚厚保章钟伟周飞鹏
Owner XUZHOU HEAVY MASCH CO LTD
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