Bidirectional driving electro-hydraulic proportional pilot valve
An electro-hydraulic proportional and two-way drive technology, applied in the hydraulic field, can solve the problems of not meeting the high-frequency response requirements of the whole machine, slow response of the pilot valve, and large consumption of materials, so as to save raw materials, reduce flow hysteresis, reduce Effect of Main Valve Volume
Pending Publication Date: 2022-08-09
JIANGSU ADVANCED CONSTR MASCH INNOVATION CENT LTD
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Problems solved by technology
[0004] In the existing traditional plug-in electro-hydraulic proportional pilot valve, the electromagnet adopts a single electromagnetic coil, which can only control the movement of the pilot spool in one direction, that is, it can only provide one-way driving force. Therefore, one main spool needs to be equipped with two electro-hydraulic coils. Proportional pilot valve, in order to realize the reversing movement of the main spool
Most of the pilot valve parts in the existing technical solutions are processed in one piece, which is difficult to process, consumes a lot of materials, and costs high
The traditional electro-hydraulic proportional pilot valve responds slowly, which cannot meet the high-frequency response requirements of the whole machine, and there is no filter device in the traditional solution, which often causes the whole machine to fail due to foreign matter stuck in the pilot valve
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[0030] Exemplary embodiments of the present invention are described below with reference to the accompanying drawings, which include various details of the embodiments of the present invention to facilitate understanding and should be considered as exemplary only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. Also, descriptions of well-known functions and constructions are omitted from the following description for clarity and conciseness.
[0031] like Figure 1 to Figure 4 As shown, a bidirectionally driven electro-hydraulic proportional pilot valve of the present invention includes a pilot valve sleeve 1.1, a pilot valve core 1.4, an electromagnetic drive unit for controlling the axial bidirectional movement of the pilot valve core 1.4, and the electromagnetic drive unit includes an armature 2.4 , The first pi...
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The invention relates to a bidirectionally-driven electro-hydraulic proportional pilot valve which comprises a pilot valve sleeve, a pilot valve element and an electromagnetic driving unit used for controlling the pilot valve element to axially move bidirectionally, and when a first electromagnetic coil or a second electromagnetic coil is powered on, electromagnetic force in different directions is generated on an armature to control the pilot valve element to move in different directions. The pilot valve element is at least provided with a first position and a second position, when the pilot valve element is located at the first position, the oil inlet P is communicated to the working oil port B, and the working oil port A is communicated to the oil return port T; and when in the second position, the oil inlet P is communicated to the working oil port A, and the working oil port B is communicated to the oil return port T. Two sets of electromagnetic coils with different winding directions are adopted in the electromagnetic driving unit, current is input into the different electromagnetic coils to control a pilot valve element to move in different directions, bidirectional driving of the pilot valve element is achieved, accordingly, on-off control over pilot pressure of a main valve element is achieved, the structure is reasonable, control is reliable, response is fast, and hysteresis is small.
Description
technical field [0001] The invention relates to the field of hydraulic technology, in particular to a bidirectionally driven electro-hydraulic proportional pilot valve. Background technique [0002] Proportional control technology is a control technology developed in the late 1960s, which is reliable, inexpensive, and whose control accuracy and response characteristics meet the requirements of industrial control systems. The electro-hydraulic proportional valve is the main power amplifying element in the proportional control system. It continuously proportionally controls the pressure, flow and other parameters of the hydraulic system according to the input electrical signal command. Compared with the servo valve, the control accuracy is still far behind, but the electro-hydraulic proportional valve It has strong anti-pollution ability, reduces the working failure caused by pollution, and improves the working stability and reliability of the hydraulic system. [0003] The i...
Claims
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IPC IPC(8): F15B13/02F15B21/041
CPCF15B13/02F15B21/041Y02P80/10
Inventor 孙辉孙珍菊肖刚刘灿杰王晓娟
Owner JIANGSU ADVANCED CONSTR MASCH INNOVATION CENT LTD