Split ratio load sensing multi-way valve
A load-sensitive, multi-way valve technology, used in fluid pressure actuation devices, servo motor assemblies, mechanical equipment, etc., can solve problems such as reduced work coordination, reduced valve stem sensitivity, and insignificant increase in flow rate for small loads combined. , to achieve the effect of improving coordination and ensuring sensitivity
Inactive Publication Date: 2010-04-21
ZHEJIANG UNIV
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Problems solved by technology
In order to increase the movement speed of the small load, usually the staff adjusts the working stroke of the valve rod of the small load to the maximum, but the increase in the working flow of the small load is not obvious
Therefore, while reducing the sensitivity of the valve stem and increasing the operating difficulty of the staff, it also greatly reduces the work coordination of the various mechanisms of the machine.
Method used
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[0017] The present invention will be described in detail below with reference to the accompanying drawings, and the objects and effects of the present invention will become more apparent.
[0018] As shown in the figure, the split ratio load-sensitive multi-way valve of the present invention is mainly composed of a large-load valve plate, a load-sensitive pressure signal selection valve plate, a small-load valve plate and a conventional load valve plate connected in sequence, and they pass through the four bolt holes. Bolted.
[0019] like figure 1 As shown, the large-load valve plate includes a valve body 101 , a main valve spool 103 , a first spring 114 , a one-way valve 121 , a compensation valve spool 129 , screws 160 and plugs 146 and 147 . The valve body 101 includes an inner hole 104 , an oil inlet 105 , an oil return port 102 , a first working oil port 144 , a second working oil port 145 , a first flow channel 111 , a second flow channel 161 , and a third flow channel...
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The invention discloses a split ratio load sensing multi-way valve which is formed by sequentially connecting a heavy-load valve plate, a load sensing pressure signal selecting valve plate, a low-load valve plate and a conventional load valve. Because the pressure ranges of each unit of loads of the split ratio load sensing multi-way valve can be predicted, pressure differences at both ends of a choke of a minimum load unit is decided whether to be increased or not through comparing a pressure difference value of a maximum load and a minimum load. When the pressure difference value of the two loads is smaller than a preset value, the pressure difference of the choke of the minimum load unit is indicated to be large enough and does not need to be increased; when the pressure difference value of the two loads is larger than the preset value, the pressure difference of the choke of the minimum load unit is indicated to be too small to influence the sensitivity of a valve rod and the working harmony of the whole machine, thus at the moment, the pressure difference of the choke is increased, and the increase valve of the pressure difference is just the pressure difference value of the maximum load and the minimum load; when the pressure difference of different load units is larger, the sensitivity of the valve rod is guaranteed, and the working harmony of the whole machine is improved.
Description
technical field [0001] The invention relates to a load-sensitive hydraulic system for construction machinery and other machinery with a split ratio, in particular to a split ratio load-sensitive multi-way valve with automatic compensation for small loads. Background technique [0002] In the split ratio load-sensing system, since the highest load pressure controls the compensation valve and the variable pump at the same time, on the one hand, the variable pump almost only outputs the hydraulic power required by the system, which minimizes the power loss. On the other hand, using the load balancing function of the compensation valve, the pressure difference across all operating valves is equal, and the flow through the multi-way valve is only related to the stroke of the operating valve stem. When the flow required by the load is greater than the maximum flow of the variable pump, each valve distributes the flow in proportion to ensure the coordination of the work of each mec...
Claims
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IPC IPC(8): F15B13/02
Inventor 管成武建伟陆姜全
Owner ZHEJIANG UNIV