Load sensitive system and engineering hoisting machinery

Abstract

The invention relates to a load sensitive technology, and discloses a load sensitive system which comprises a pumping device connected with an engine and a downstream compensation load sensitive multi-way valve, and the pumping device is connected with a plurality of executing mechanisms through the downstream compensation load-sensitive multi-way valve; a maximum load pressure feedback port of the pumping device is connected to the downstream compensation load sensitive multi-way valve so as to control the flow of the pumping device according to the maximum load pressure fed back by the downstream compensation load sensitive multi-way valve; and the load sensitive system further comprises a control unit used for controlling the output pressure of a plurality of pressure control devices, and the pressure control devices are connected with the executing mechanisms in a one-to-one correspondence mode through the downstream compensation load sensitive multi-way valve so as to control the flow of hydraulic oil flowing into the executing mechanisms. The invention further discloses an engineering hoisting machine. According to the load sensitive system and the engineering hoisting machine, all the executing mechanisms can be well made to move in a coordinated mode, and good flow distribution performance is achieved.

Description

technical field [0001] The invention relates to load sensing technology, in particular to a load sensing system, and also to an engineering hoisting machine. Background technique [0002] A load sensing system is a hydraulic circuit that senses system pressure-flow requirements and only provides the required flow and pressure. With the rapid development of hydraulic technology, the load-sensing technology is becoming more and more mature. The power loss of the load-sensing control system is lower, and the efficiency is much higher than that of the conventional hydraulic system. Widely used in industry equipment. Especially in the case of multiple loads and large changes in working conditions, the load-sensing technology is more advantageous. [0003] In the existing technical solution, the load sensing system is divided into pre-valve compensation and post-valve compensation according to the arrangement relationship between the pressure compensation valve and the main valv...

AI Technical Summary

Problems solved by technology

[0004] Among them, if the post-valve compensation is applied to the hydraulic system of the crane, the rated flow rate of the oil source pump changes with the change of the engine speed. Generally speaking, in order to meet the full speed of the engine, the main valve core needs to open the flow area to the maximum; However, when the engine is running at idle speed, the flow area that the main spool actually needs to open is very small, but the operator will drive the spool to the maximum flow area, resulting in an extreme gap between the actual flow area and the required flow area. Matching, so that the performance of flow distribution drops sharply, making the coordination of multiple working joints compound actions poor

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