Multiway valve, hydraulic system and land leveller
A hydraulic system and multi-way valve technology, applied in the field of hydraulic systems, can solve problems such as poor operating feel, poor composite action effect, and large system heat generation
Pending Publication Date: 2018-03-09
XUZHOU XUGONG ROAD CONSTR MACHINERY +1
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Problems solved by technology
[0005] (1) The flow allocated by each actuator cannot be allocated according to the actual demand, and the compound action effect is poor
[0006] (2) Due to the use of the open center multi-way valve, if the loads of each connection are different, when the handle of the main valve is moved for the same stroke, the flow allowed by the main valve will be different due to the difference in load, so when the handle is pushed to change direction Operation feel is poor
[0007] (3) Since the hydraulic system uses a quantitative pump to supply oil, when working under low load conditions, the gear pump is still supplying oil at a constant flow rate, and most of the excess oil can only return to the oil tank through the overflow valve 3a, so this There is also a large loss in the application of this kind of multi-way valve, which leads to a large heat generation in the system
Method used
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[0032] The present invention will be described in detail below. In the following paragraphs, different aspects of the embodiments are defined in more detail. Aspects so defined may be combined with any other aspect or aspects unless specifically stated otherwise. In particular, any feature considered to be preferred or advantageous may be combined with one or more other features which are considered to be preferred or advantageous.
[0033] Terms such as "first" and "second" appearing in the present invention are only for convenience of description, to distinguish different components with the same name, and do not indicate a sequence or a primary and secondary relationship.
[0034] In order to overcome the defects of the multi-way valve in the prior art, the present invention provides an improved multi-way valve, such as Figure 2 to Figure 8 shown. In an exemplary embodiment, the multi-way valve includes: a control valve link arranged in series on the oil supply circuit ...
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The invention relates to a multiway valve, a hydraulic system and a land leveller. The multiway valve comprises control valve units which are arranged on an oil supply line of the hydraulic system inseries and correspond to a plurality of actuating elements. Each control valve unit comprises a compensating component (3), wherein the control end of the compensating component (3) can lead in the maximum load pressure of the actuating element of each subsystem, the control ends of the control valve units communicate with one another, and the oil supply amount of the subsystem where the compensating component (3) is located can be adjusted according to the result of the comparison of the load pressure of the subsystem where the compensating component (3) is located with the maximum load pressure. When the multiple actuating elements with the different loads act at the same time, by means of the multiway valve, the flow in the control valve units can be allocated according to the proportion of the loads, so that the effect that the actuating elements act in a coordinated manner is achieved.
Description
technical field [0001] The invention relates to the technical field of hydraulic systems, in particular to a multi-way valve, a hydraulic system and a grader. Background technique [0002] Motor graders generally have the following actions: left and right blade lifting, rear loosening, front bulldozing, blade extraction, soil angle change, motor rotation, front wheel tilting hinged steering and blade swing, in order to simplify the structure of the hydraulic system Generally, multi-way valves are used to control the actuators required to complete these actions. [0003] Such as figure 1 The scheme shown is the multi-way valve used by the mainstream grader. The multi-way valve sets four main valves in series. According to different control requirements, there are first main valve 1a and second main valve 2a, first main valve 1a and The structure of the second main valve 2a is different. The hydraulic system where the multi-way valve is located can use a gear pump to supply...
Claims
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IPC IPC(8): F15B13/06F15B13/01E02F3/85
CPCF15B13/01F15B13/06E02F3/84
Inventor 梁帮修姜洪范杨张晓磊
Owner XUZHOU XUGONG ROAD CONSTR MACHINERY