Electromagnetic pilot operated valve assembly and hydraulic system

Abstract

The utility model discloses an electromagnetic pilot operated valve assembly and a hydraulic system, the electromagnetic pilot operated valve assembly comprises a first pilot operated valve and a second pilot operated valve, the first pilot operated valve is provided with a first liquid inlet and a first working port, the second pilot operated valve is provided with a second liquid inlet and a main liquid return port, a first pipeline is connected between the first working port and the second liquid inlet, and a second pipeline is connected between the main liquid return port and the second liquid return port. A main working port is formed in the first pipeline; when the first pilot valve is in the first state, a liquid path between the main working port and the first pilot valve is cut off; when the first pilot valve is in the second state, the first pilot valve is communicated with the main working port; in the third state, the second pilot valve is stopped from the second liquid inlet to the main liquid return opening; and in the fourth state, the second pilot valve is conducted from the second liquid inlet to the main liquid return port. According to the electromagnetic pilot operated valve assembly, the pressure control function and the pressure maintaining function of a certain pressure interval can be achieved for one cavity, the overall structure integration degree is high, stepless pressure control of the certain pressure interval can be achieved, and power consumption is lower.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic technology, and more specifically, to an electromagnetic pilot valve assembly and a hydraulic system. Background Technology

[0002] Solenoid pilot valves are widely used electromechanical-hydraulic conversion devices. Intrinsically safe solenoid pilot valves are widely used in mine hydraulic systems and are one of the main components for realizing remote control. With the development of mine automation and intelligent construction, intrinsically safe solenoid pilot valves are developing towards intelligent control and remote control, and their uses and functions are becoming more and more diverse.

[0003] In existing technologies, two two-position three-way valves typically share a common P port and a common R port. By changing the energization of the electromagnets of the two two-position three-way valves, the two working ports can be switched separately. However, such electromagnetic pilot valve assemblies are difficult to use to achieve pressure control in the same chamber; or other solutions require intrinsically safe design. Utility Model Content

[0004] In view of this, the present invention aims to provide an electromagnetic pilot valve assembly and a hydraulic system to solve at least one of the technical problems of the prior art, such as the low integration level of electromagnetic pilot valve assemblies, the difficulty in achieving pressure control of a single chamber, and the difficulty in meeting intrinsically safe design requirements.

[0005] This utility model provides an electromagnetic pilot valve assembly, including a first pilot valve and a second pilot valve. The first pilot valve has a first inlet and a first working port, and the second pilot valve has a second inlet and a total return port. A first pipeline connects the first working port and the second inlet, and a total working port is provided on the first pipeline. When the first pilot valve is in a first state, the liquid path between the total working port and the first pilot valve is cut off. When the first pilot valve is in a second state, the liquid path from the first pilot valve to the total working port is opened. When the second pilot valve is in a third state, the liquid path from the second inlet to the total return port is cut off. When the second pilot valve is in a fourth state, the liquid path from the second inlet to the total return port is opened.

[0006] Furthermore, it also includes a first check valve, which is disposed on the first pipeline to allow unidirectional flow of the liquid path from the first pilot valve to the main working port.

[0007] Furthermore, the first pilot valve is provided with a first manual switch, and the second pilot valve is provided with a second manual switch.

[0008] Furthermore, the first pilot valve is an intrinsically safe electromagnetic pilot valve with at least two positions and at least two ports.

[0009] Furthermore, the second pilot valve is an intrinsically safe electromagnetic pilot valve with at least two positions and at least two ports.

[0010] The electromagnetic pilot valve assembly of this invention connects the first working port of the first pilot valve and the second inlet port of the second pilot valve through a first pipeline. When the first pilot valve is in the second state, the hydraulic path from the first pilot valve to the main working port is opened, and the high-pressure hydraulic fluid from the first inlet port reaches the main working port through the first working port and the first pipeline, realizing the pressurization function of the hydraulic circuit at the main working port. When the second pilot valve is in the fourth state, the hydraulic path from the second inlet port to the main return port is opened, and the high-pressure hydraulic fluid from the hydraulic circuit at the main working port reaches the main return port through the first pipeline and the second inlet port, realizing the pressure reduction function of the hydraulic circuit. When the first pilot valve is in the fourth state, the hydraulic path from the second inlet port to the main return port is opened, and the high-pressure hydraulic fluid from the hydraulic circuit at the main working port reaches the main return port through the first pipeline and the second inlet port, realizing the pressure reduction function of the hydraulic circuit. When the first state and the second pilot valve is in the third state, the hydraulic circuit between the main working port and the first pilot valve is cut off, and the hydraulic circuit from the second inlet to the main return port is also cut off, thus realizing the pressure holding function of the hydraulic circuit. The electromagnetic pilot valve assembly can realize pressure control and pressure holding functions within a certain pressure range for a chamber. The overall structure has a high degree of integration and can achieve stepless pressure control within a certain pressure range. Furthermore, the electromagnetic pilot valve assembly only needs to meet the intrinsically safe power supply requirements of the first and second pilot valves, resulting in lower power consumption and easier compliance with the intrinsically safe design of the hydraulic system. This is beneficial for meeting the requirements of mine automation and intelligent construction.

[0011] This utility model also provides a hydraulic system, including a component to be operated and the electromagnetic pilot valve assembly, wherein the component to be operated is provided with a control chamber, and the main working port is connected to the control chamber.

[0012] Furthermore, it also includes a liquid tank, and the main return port is connected to the liquid tank.

[0013] Furthermore, it also includes a second one-way valve, and a second pipeline is connected between the main return port and the liquid tank. The second one-way valve is disposed on the second pipeline to enable one-way flow from the main return port to the liquid tank.

[0014] Furthermore, it also includes an energy accumulator, and a third pipeline connects the main working port and the control chamber, with the energy accumulator disposed on the third pipeline.

[0015] Furthermore, it also includes a filter, and the first inlet is connected to a fourth pipeline for connection to the high-pressure end, with the filter disposed on the fourth pipeline.

[0016] The hydraulic system of this utility model uses an electromagnetic pilot valve assembly in which the first working port of the first pilot valve and the second inlet port of the second pilot valve are connected through a first pipeline. When the first pilot valve is in the second state, the hydraulic path from the first pilot valve to the main working port is opened, and the high-pressure fluid from the first inlet port reaches the main working port through the first working port and the first pipeline, realizing the pressurization function of the hydraulic circuit at the main working port. When the second pilot valve is in the fourth state, the hydraulic path from the second inlet port to the main return port is opened, and the high-pressure fluid of the hydraulic circuit at the main working port reaches the main return port through the first pipeline and the second inlet port, realizing the pressure reduction function of the hydraulic circuit. When the first pilot valve is in the first state and the second pilot valve is in the third state, the hydraulic circuit between the main working port and the first pilot valve is cut off, and the hydraulic circuit from the second inlet to the main return port is also cut off, thus realizing the pressure holding function of the hydraulic circuit. The electromagnetic pilot valve assembly can realize pressure control and pressure holding functions within a certain pressure range for a chamber. The overall structure has a high degree of integration and can achieve stepless pressure control within a certain pressure range. Furthermore, the electromagnetic pilot valve assembly only needs to meet the intrinsically safe power supply requirements of the first and second pilot valves, resulting in lower power consumption and easier compliance with the intrinsically safe design of the hydraulic system, which is beneficial for meeting the requirements of mine automation and intelligent construction.

[0017] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] In drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with or without letter suffixes may indicate different instances of similar parts. The drawings generally illustrate various embodiments by way of example rather than limitation and, together with the description and claims, serve to illustrate the disclosed embodiments. Where appropriate, the same reference numerals are used in all drawings to refer to the same or similar parts. Such embodiments are illustrative and not intended to be exhaustive or exclusive embodiments of the apparatus or method. The accompanying drawings, which are provided to further understand the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with their description, serve to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0019] Figure 1 This is a schematic diagram of the electromagnetic pilot valve assembly in this utility model;

[0020] Figure 2 This is a schematic diagram of the hydraulic system in this utility model.

[0021] The above figures include the following reference numerals:

[0022] 100. Hydraulic system; 1001. Second pipeline; 1002. Third pipeline; 1003. Fourth pipeline; 10. Electromagnetic pilot valve assembly; 101. First pipeline; 1011. Main working port; 11. First pilot valve; 111. First inlet; 112. First working port; 113. First return port; 114. First manual switch; 12. Second pilot valve; 121. Second inlet; 122. Main return port; 123. Second return port; 124. Second manual switch; 13. First check valve; 20. Component to be operated; 21. Control chamber; 30. Liquid tank; 40. Second check valve; 50. Accumulator; 60. Filter. Detailed Implementation

[0023] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, but these are not intended to limit the scope of the present invention.

[0024] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0025] This specification may use the phrases “in one embodiment,” “in another embodiment,” “in yet another embodiment,” or “in other embodiments,” all of which may refer to one or more of the same or different embodiments according to the present invention.

[0026] This utility model provides an electromagnetic pilot valve assembly 10, including a first pilot valve 11 and a second pilot valve 12. The first pilot valve 11 is provided with a first inlet 111 and a first working port 112. The second pilot valve 12 is provided with a second inlet 121 and a total return port 122. A first pipeline 101 is connected between the first working port 112 and the second inlet 121. The first pipeline 101 is provided with a total working port 1011. The first pilot valve 11 is in a first state. When the first pilot valve 11 is in the second state, the liquid path between the main working port 1011 and the first pilot valve 11 is cut off; when the first pilot valve 11 is in the second state, the liquid path from the first pilot valve 11 to the main working port 1011 is opened; when the second pilot valve 12 is in the third state, the liquid path from the second inlet port 121 to the main return port 122 is cut off; when the second pilot valve 12 is in the fourth state, the liquid path from the second inlet port 121 to the main return port 122 is opened.

[0027] The first pilot valve 11 and the second pilot valve 12 can be controlled by electromagnets, so that the first pilot valve 11 can switch between a first state and a second state, and the second pilot valve 12 can switch between a third state and a fourth state (the first, second, third, and fourth states usually change with the movement of the valve cores of the first pilot valve 11 and the second pilot valve 12; for example, the first state is the de-energized state, the second state is the energized state, the third state is the de-energized state, and the fourth state is the energized state). In practical applications, the first pilot valve 11 can be selected as needed, and it can be a pilot valve with at least two positions and at least two ports; the second pilot valve 12 can be selected as needed, and it can be a pilot valve with at least two positions and at least two ports.

[0028] Preferably, it further includes a first check valve 13, which is disposed on the first pipeline 101 to allow unidirectional flow of the liquid path from the first pilot valve 11 to the main working port 1011.

[0029] Combination Figure 1As shown, in this embodiment, the first pilot valve 11 is a two-position three-way valve, and the second pilot valve 12 is a two-position three-way valve. The first pilot valve 11 is also provided with a first return port 113, and the second pilot valve 12 is also provided with a second return port 123. The first check valve 13 is provided on the first pipeline 101. The first check valve 13 realizes the function of opening the liquid path from the first pilot valve 11 to the main working port 1011 and closing the liquid path from the main working port 1011 to the first pilot valve 11. When the first pilot valve 11 is in the second state, the first working port 112 is connected to the first inlet port 111 (i.e., the hydraulic path from the first pilot valve 11 to the main working port 1011 is open), and the first return port 113 is closed. At this time, the high-pressure fluid enters the first pipeline 101 through the first inlet port 111 and the first working port 112, and then increases the hydraulic circuit pressure through the main working port 1011. When the second pilot valve 12 is in the fourth state, the second inlet port 121 is connected to the main return port 122 (i.e., the hydraulic path from the second inlet port 121 to the main return port 122 is open), and the second return port 123 is closed. At this time, the high-pressure fluid at the main working port 1011 is depressurized by passing through the first pipeline 101 and the second inlet port 121, and then through the main return port 122. When valve 11 is in the first state and the second pilot valve 12 is in the third state, the first working port 112 is connected to the first return port 113. The first check valve 13 cuts off the hydraulic circuit from the main working port 1011 to the first pilot valve 11, and at the same time, the first inlet port 111 is cut off (that is, the hydraulic circuit between the main working port 1011 and the first pilot valve 11 is cut off, that is, the hydraulic circuit from the main working port 1011 to the first pilot valve 11 and from the first pilot valve 11 to the main working port 1011 is cut off). The main return port 122 is connected to the second return port 123, and the second inlet port 121 is cut off (that is, the hydraulic circuit from the second inlet port 121 to the main return port 122 is cut off). The high pressure of the main working port 1011 is cut off by the first check valve 13 and the second pilot valve 12, realizing the pressure holding function of the hydraulic circuit.

[0030] It should be noted that for the first pilot valve 11 with the first return port 113 (i.e., the first pilot valve 11 with at least two positions and at least three ports), optionally, the first check valve 13 can be replaced by blocking the first return port 113 (that is, blocking the first return port 113, or the electromagnetic pilot valve assembly also includes the first check valve 13, which is disposed on the first pipeline 101 to make the liquid path from the first pilot valve 11 to the main working port 101 unidirectional). This solution (blocking the first return port 113) can achieve a similar function to the solution of setting the first check valve 13, that is, in the first state of the first pilot valve 11, the liquid path between the main working port 1011 and the first pilot valve 11 is cut off; in the second state of the first pilot valve 11, the liquid path from the first pilot valve 11 to the main working port 1011 is open. Optionally, a sealing structure can be used to seal the first return port 112, or other methods can be used to seal the first return port 112; no limitation is made here.

[0031] Preferably, the first pilot valve 11 is an intrinsically safe electromagnetic pilot valve with at least two positions and at least two ports, and the second pilot valve 12 is an intrinsically safe electromagnetic pilot valve with at least two positions and at least two ports.

[0032] For example, the first pilot valve 11 is a two-position two-way intrinsically safe electromagnetic pilot valve, which has a first inlet 111 and a first working port 112; the second pilot valve 12 is a two-position two-way intrinsically safe electromagnetic pilot valve, which has a second inlet 121 and a total return port 122 (the above-mentioned two-position two-way valve scheme is not shown in the figure). When the first pilot valve 11 is in the first state, the first inlet port 111 and the first working port 112 are closed. When the second pilot valve 12 is in the third state, the second inlet port 121 and the total return port 122 are closed. Therefore, the power-off pressure-maintaining function of the hydraulic circuit at the total working port 1011 can be realized. When the first pilot valve 11 is in the second state, the first inlet port 111 and the first working port 112 are connected (that is, the hydraulic passage from the first pilot valve 11 to the total working port 1011 is opened), realizing the pressure boosting function of the hydraulic circuit. When the second pilot valve 12 is in the fourth state, the second inlet port 121 and the total return port 122 are connected (that is, the hydraulic passage from the second inlet port 121 to the total return port 122 is opened), realizing the pressure reduction function.

[0033] It is understood that electromagnetic pilot valve assemblies can be applied to various hydraulic systems. Therefore, the schemes of using at least two-position, at least two-way first pilot valve 11 and at least two-position, at least two-way second pilot valve 12 to meet different needs are all within the scope of this utility model (wherein, the position and position of the first pilot valve 11 and the second pilot valve 12 may not be equal, for example, the first pilot valve 11 is a two-position, two-way valve and the second pilot valve 12 is a two-position, three-way valve).

[0034] In this way, the intrinsically safe electromagnetic pilot valve can better meet the needs of safe production in mines. By energizing the first pilot valve 11 and the second pilot valve 12, remote control can be achieved. It has the advantages of fast response, stability and reliability, and is easy to realize intelligent control.

[0035] Optionally, combined Figure 1 As shown, the first pilot valve 11 is provided with a first manual switch 114, and the second pilot valve 12 is provided with a second manual switch 124.

[0036] The first manual switch 114 and the second manual switch 124 can be designed with appropriate switching structures as needed, as long as they can achieve the switching function of the first pilot valve 11 and the second pilot valve 12. In this way, in case of unexpected situations such as electrical control failure, manual operation can be achieved through the first manual switch 114 and the second manual switch 124, which is beneficial to the safety of the hydraulic system.

[0037] The electromagnetic pilot valve assembly 10 of this invention connects the first working port 112 of the first pilot valve 11 and the second inlet port 121 of the second pilot valve 12 through a first pipeline 10. When the first pilot valve 11 is in the second state, the hydraulic path from the first pilot valve 11 to the main working port 1011 is opened, and the high-pressure hydraulic fluid from the first inlet port 111 reaches the main working port 1011 through the first working port 112 and the first pipeline 101, thereby realizing the pressurization function of the hydraulic circuit at the main working port 1011. When the second pilot valve 12 is in the fourth state, the hydraulic path from the second inlet port 121 to the main return port 122 is opened, and the high-pressure hydraulic fluid from the hydraulic circuit at the main working port 1011 reaches the main return port 122 through the first pipeline 101 and the second inlet port 121. The hydraulic circuit achieves pressure reduction; when the first pilot valve 11 is in the first state and the second pilot valve 12 is in the third state, the hydraulic passage between the main working port 1011 and the first pilot valve 11 is cut off, and the hydraulic passage from the second inlet port 121 to the main return port 122 is cut off, thus realizing the pressure holding function of the hydraulic circuit; the electromagnetic pilot valve assembly 10 can realize pressure control and pressure holding functions for a certain pressure range in a chamber. The overall structure has a high degree of integration and can realize stepless pressure control within a certain pressure range. Moreover, the electromagnetic pilot valve assembly 10 only needs to meet the intrinsically safe power supply requirements of the first pilot valve 11 and the second pilot valve 12, resulting in lower power consumption and easier compliance with the intrinsically safe design of the hydraulic system, which is conducive to meeting the requirements of mine automation and intelligent construction.

[0038] This utility model also provides a hydraulic system 100, including a component to be operated 20 and the electromagnetic pilot valve assembly 10, wherein the component to be operated 20 is provided with a control chamber 21, and the main working port 1011 is connected to the control chamber 21.

[0039] Combination Figure 2As shown, the hydraulic system 100 includes at least an electromagnetic pilot valve assembly 10 and a component to be acted 20. The component to be acted 20 can be any hydraulic element selected as needed, such as a relief valve, a control valve, etc. The component to be acted 20 is provided with a control chamber 21, and the main working port 1011 of the electromagnetic pilot valve assembly 10 is connected to the control chamber 21, so that the control chamber 21 can be pressure controlled and pressure maintained.

[0040] The hydraulic system 100 of this invention uses an electromagnetic pilot valve assembly 10, in which the first working port 112 of the first pilot valve 11 and the second inlet port 121 of the second pilot valve 12 are connected through a first pipeline 10. When the first pilot valve 11 is in the second state, the hydraulic path from the first pilot valve 11 to the main working port 1011 is opened, and the high-pressure hydraulic fluid from the first inlet port 111 reaches the main working port 1011 through the first working port 112 and the first pipeline 101, realizing the pressurization function of the hydraulic circuit at the main working port 1011. When the second pilot valve 12 is in the fourth state, the hydraulic path from the second inlet port 121 to the main return port 122 is opened, and the high-pressure hydraulic fluid of the hydraulic circuit at the main working port 1011 reaches the main return port 122 through the first pipeline 101 and the second inlet port 121. The return port 122 enables the hydraulic circuit to reduce pressure. When the first pilot valve 11 is in the first state and the second pilot valve 12 is in the third state, the hydraulic circuit between the main working port 1011 and the first pilot valve 11 is cut off, and the hydraulic circuit from the second inlet port 121 to the main return port 122 is also cut off, thus realizing the pressure holding function of the hydraulic circuit. The electromagnetic pilot valve assembly 10 can achieve pressure control and pressure holding functions within a certain pressure range for a chamber. The overall structure has a high degree of integration and can achieve stepless pressure control within a certain pressure range. Furthermore, the electromagnetic pilot valve assembly 10 only needs to meet the intrinsically safe power supply requirements of the first pilot valve 11 and the second pilot valve 12, resulting in lower power consumption and easier compliance with the intrinsically safe design of the hydraulic system, which is beneficial for meeting the requirements of mine automation and intelligent construction.

[0041] Furthermore, the hydraulic system 100 also includes a liquid tank 30, and the main return port 122 is connected to the liquid tank 30.

[0042] Combination Figure 2 As shown, the main return port 122 is connected to the liquid tank 30 via, for example, a pipeline. When the second pilot valve 12 is in the fourth state, the high-pressure liquid in the control chamber 21 can smoothly return to the liquid tank 30, thereby achieving the pressure reduction function.

[0043] Furthermore, it also includes a second one-way valve 40, and a second pipeline 1001 is connected between the main return port 122 and the liquid tank 30. The second one-way valve 40 is disposed on the second pipeline 1001 so that the main return port 122 can be unidirectionally connected to the liquid tank 30.

[0044] Combination Figure 2 As shown, the main return port 122 is connected to the liquid tank 30 through the second pipeline 1001, and the second one-way valve 40 is installed on the second pipeline 1001 to make the main return port 122 to the liquid tank 30 unidirectionally connected, preventing the return liquid from flowing back into the control chamber 21.

[0045] Furthermore, it also includes an energy storage device 50, and a third pipeline 1002 is connected between the main working port 1011 and the control chamber 21, with the energy storage device 50 disposed on the third pipeline 1002.

[0046] Combination Figure 2 As shown, the main working port 1011 is connected to the control chamber 21 through the third pipeline 1002. The accumulator 50 is installed on the third pipeline 1002. When pressurizing (the first pilot valve 11 is in the second state), the high-pressure liquid from the first inlet 111 passes through the first working port 112 and the first pipeline 101 to reach the main working port 1011 and is introduced into the accumulator 50. Due to the shut-off of the first check valve 13 and the second pilot valve 12, the accumulator 50 achieves pressurization of the control chamber 21. When depressurizing (the second pilot valve 12 is in the fourth state), the high-pressure liquid at the main working port 1011 passes through the first pipeline 101 and the second inlet 121 to reach the main return port 122. The accumulator 50 depressurizes, causing the control chamber 21 to depressurize.

[0047] Thus, the accumulator 50 facilitates the pressure control function of the control chamber 21.

[0048] Furthermore, the hydraulic system 100 also includes a filter 60, and the first inlet 111 is connected to a fourth pipeline 1003 to connect to the high-pressure end P, and the filter 60 is disposed on the fourth pipeline 1003.

[0049] Combination Figure 2 As shown, the inlet of the component to be used 20 is connected to a fifth pipeline. The first inlet 111 is connected to the fifth pipeline through the fourth pipeline 1003, and then connected to the high-pressure end P through the fifth pipeline. The high-pressure end P can be the port of a certain hydraulic branch, and its pressure is greater than the pressure of the control chamber 21 to a certain extent, so as to realize the function of pressurizing the control chamber 21. The filter 60 is set on the fourth pipeline 1003 so that the high-pressure liquid is filtered before entering the first pilot valve 11, ensuring the service life of the hydraulic system 100.

[0050] In addition, in the hydraulic system 100 of this utility model, a pressure detection element and a controller can be added. The pressure detection element acquires the system pressure value in real time. The controller can compare the preset pressure value with the system pressure value to determine whether to increase pressure, decrease pressure or maintain pressure, and then transmit the corresponding control signal to the remote first pilot valve 11 and second pilot valve 12 (an intrinsically safe electromagnetic pilot valve can be used to facilitate remote control), and finally realize the remote pressure regulation function of the control chamber 21 of the component to be acted 20.

[0051] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, rotated 90 degrees, or in other orientations, and the spatial relative descriptions used herein will be interpreted accordingly.

[0052] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this utility model.

[0053] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An electromagnetic pilot valve assembly, characterized in that, It includes a first pilot valve and a second pilot valve. The first pilot valve is provided with a first inlet and a first working port. The second pilot valve is provided with a second inlet and a main return port. A first pipeline is connected between the first working port and the second inlet. The first pipeline is provided with a main working port. When the first pilot valve is in the first state, the liquid passage between the main working port and the first pilot valve is cut off; when the first pilot valve is in the second state, the liquid passage from the first pilot valve to the main working port is opened. When the second pilot valve is in the third state, the liquid path from the second inlet to the main return port is cut off; When the second pilot valve is in the fourth state, the liquid path from the second inlet to the main return port is opened.

2. The electromagnetic pilot valve assembly according to claim 1, characterized in that, It also includes a first check valve, which is disposed on the first pipeline to allow unidirectional flow of the liquid path from the first pilot valve to the main working port.

3. The electromagnetic pilot valve assembly according to claim 1, characterized in that, The first pilot valve is equipped with a first manual switch, and the second pilot valve is equipped with a second manual switch.

4. The electromagnetic pilot valve assembly according to claim 1, characterized in that, The first pilot valve is an intrinsically safe electromagnetic pilot valve with at least two positions and at least two ports.

5. The electromagnetic pilot valve assembly according to claim 1, characterized in that, The second pilot valve is an intrinsically safe electromagnetic pilot valve with at least two positions and at least two ports.

6. A hydraulic system, characterized in that, The device includes a component to be operated and an electromagnetic pilot valve assembly as described in any one of claims 1 to 5, wherein the component to be operated is provided with a control chamber, and the main working port is connected to the control chamber.

7. The hydraulic system according to claim 6, characterized in that, It also includes a liquid tank, and the main return port is connected to the liquid tank.

8. The hydraulic system according to claim 7, characterized in that, It also includes a second one-way valve, and a second pipeline is connected between the main return port and the liquid tank. The second one-way valve is installed on the second pipeline to allow one-way flow from the main return port to the liquid tank.

9. The hydraulic system according to claim 6, characterized in that, It also includes an energy accumulator, and a third pipeline connects the main working port and the control chamber, with the energy accumulator disposed on the third pipeline.

10. The hydraulic system according to claim 6, characterized in that, It also includes a filter, and the first inlet is connected to a fourth pipeline to connect to the high-pressure end, with the filter disposed on the fourth pipeline.

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