Logic combination control type mining electro-hydraulic control speed regulating system and hydraulic support assembly

Abstract

The invention provides a logic combination control type mining electro-hydraulic control speed regulating system and a hydraulic support assembly. The liquid inlet end of the system is connected with liquid inlets of a first reversing valve, a second reversing valve, a first electromagnetic pilot valve and a second electromagnetic pilot valve; a liquid outlet of the first electromagnetic pilot valve is connected with a control cavity of the first reversing valve and a liquid inlet of the first electromagnetic switch valve, a liquid outlet of the second electromagnetic pilot valve is connected with a control cavity of the second reversing valve, and liquid outlets of the first reversing valve and the second reversing valve are connected with a rodless cavity and a rod cavity respectively. A first overflow valve is arranged between a liquid outlet of the first electromagnetic pilot valve and a liquid inlet of the first electromagnetic switch valve, or throttling holes are formed in the positions behind the first electromagnetic reversing valve and the first electromagnetic switch valve respectively. According to the mining electro-hydraulic control reversing valve with the graded flow control function, the jack position control precision of a hydraulic support is improved.

Description

Technical Field

[0001] This disclosure relates to the technical field of control valves, and more specifically, to a logic combination control type electro-hydraulic speed control system for mining and a hydraulic support assembly. Background Technology

[0002] Electro-hydraulic directional control valves are core control components of electro-hydraulic control systems. They are hydraulic directional control valves that integrate an electromagnetic pilot valve and a main valve. Their working principle involves using high-pressure fluid in the electromagnetic pilot valve's hydraulic circuit to drive the main valve spool, thereby controlling the movement of the actuator. As a key component of the electro-hydraulic control system for hydraulic supports, they play a crucial role in the realization of mechanized and unmanned mining in coal mines. However, current electro-hydraulic directional control valves still have many shortcomings. For example, they struggle to precisely control the hydraulic support jacks, failing to meet the actual needs of mechanized and unmanned coal mining. The core issue lies in the inability to accurately control the flow rate through the electro-hydraulic directional control valve, particularly the inability to adjust the flow rate by controlling the control chamber pressure, thus failing to provide corresponding control for different flow rates. Summary of the Invention

[0003] To address the aforementioned problems in the prior art, this disclosure provides a logic combination control type electro-hydraulic speed regulation system for mining and a hydraulic support assembly.

[0004] In view of this, this disclosure provides a logic combination control type electro-hydraulic speed regulation system for mining, including a system inlet end, a system return end, a hydraulic cylinder, a valve assembly, and a controller. The hydraulic cylinder includes a rodless chamber and a rod chamber. The valve assembly includes a first directional valve, a second directional valve, a first solenoid pilot valve, a first solenoid switching valve, and a second solenoid pilot valve. The controller is connected to the control terminals of the first solenoid pilot valve, the first solenoid switching valve, and the second solenoid pilot valve. The system inlet end is connected to the first directional valve, the second directional valve, and the first solenoid pilot valve via... The first electromagnetic pilot valve is connected to the inlet of the second electromagnetic pilot valve, and the outlet of the first electromagnetic pilot valve is connected to the control chamber of the first directional valve and the inlet of the first electromagnetic switch valve. The outlet of the second electromagnetic pilot valve is connected to the control chamber of the second directional valve. The outlets of the first directional valve and the second directional valve are connected to the rodless chamber and the rod chamber, respectively. A first overflow valve is provided between the outlet of the first electromagnetic pilot valve and the inlet of the first electromagnetic switch valve, or a throttling orifice is provided at the downstream position of the first electromagnetic directional valve and the first electromagnetic switch valve, respectively.

[0005] In some embodiments, the system return port is connected to the return ports of the first electromagnetic pilot valve and the second electromagnetic pilot valve.

[0006] In some embodiments, the system inlet is connected to the inlet of the first directional valve and the inlet of the second directional valve via a first inlet pipe, and to the inlet of the first electromagnetic pilot valve and the second electromagnetic pilot valve via a second inlet pipe; the system return pipe is connected to the return port of the first directional valve and the return port of the second directional valve via a first return pipe, and to the return port of the first electromagnetic pilot valve, the electromagnetic switching valve, and the second electromagnetic pilot valve via a second return pipe.

[0007] In some embodiments, the outlet of the first electromagnetic pilot valve is connected to the control chamber of the first directional valve through a first pipeline and to the inlet of the first electromagnetic switch valve through a second pipeline. The first overflow valve is disposed on the second pipeline, and the outlet of the second electromagnetic pilot valve is connected to the control chamber of the second directional valve through a third pipeline.

[0008] In some embodiments, a filter device is provided on the second inlet pipeline, and the filter device is disposed between the system inlet end and the inlet of the first electromagnetic pilot valve and the second electromagnetic pilot valve.

[0009] In some embodiments, a first check valve is provided on the second inlet pipeline, the first check valve being disposed between the system inlet end and the filter device, and a second check valve is provided on the second return pipeline, the second check valve being disposed between the system return end and the first electromagnetic pilot valve, the second electromagnetic switch valve, and the return port of the second electromagnetic pilot valve.

[0010] In some embodiments, the first reversing valve and / or the second reversing valve are two-stage flow reversing valves.

[0011] In some embodiments, when the second reversing valve is a two-stage flow reversing valve, the valve assembly further includes a second solenoid switch valve, the controller is connected to the control terminal of the second solenoid switch valve, the outlet of the second solenoid pilot valve is connected to the inlet of the second solenoid switch valve through a fourth pipeline, and the return port of the second solenoid switch valve is connected to the return terminal of the system.

[0012] In some embodiments, a second relief valve is provided on the fourth pipeline, or throttling orifices are provided at the downstream positions of the first electromagnetic directional valve, the first electromagnetic switch valve, the second electromagnetic pilot valve, and the second electromagnetic switch valve, respectively.

[0013] This disclosure provides a hydraulic support assembly, including a hydraulic support, a jack, and the differential pressure throttling type electro-hydraulic speed control system for mining as described in any of the above technical solutions, wherein the hydraulic cylinder is connected to the jack.

[0014] This disclosure utilizes a mine-use electro-hydraulic directional valve with graded flow control to improve the jack position control accuracy of hydraulic supports. The combination of two throttle ports and two solenoid pilot valves allows for pressure control of the directional valve's control chamber, thereby regulating the flow rate through the valve. Specifically, a large flow rate is achieved when the hydraulic cylinder needs to extend rapidly, and a small flow rate is achieved when the hydraulic cylinder needs to extend slowly, thus precisely controlling the position of the hydraulic support.

[0015] To make the above-described objects, features and advantages of the embodiments of this disclosure more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0016] 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 illustrate various embodiments generally by way of example rather than limitation and are used, together with the description and claims, 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 embodiments of this disclosure and form part of this application, are illustrative embodiments of this disclosure and their descriptions are used to explain embodiments of this disclosure and do not constitute an undue limitation of the embodiments of this disclosure.

[0017] Figure 1 This is a schematic diagram of the structure of a logic combination control type electro-hydraulic speed regulation system for mining, according to one embodiment of the present disclosure;

[0018] Figure 2 This is a second schematic diagram of the structure of a logic combination control type electro-hydraulic speed regulation system for mining, according to one embodiment of this disclosure;

[0019] Figure 3 This is a third schematic diagram of the structure of a logic combination control type electro-hydraulic speed regulation system for mining, according to one embodiment of this disclosure;

[0020] Figure 4 This is the fourth schematic diagram of the structure of a logic combination control type mine electro-hydraulic speed regulation system in one embodiment of this disclosure.

[0021] Figure label:

[0022] 11-Hydraulic cylinder; 11a-Rodless chamber; 11b-Rod chamber; 21-First directional valve; 31-Second directional valve; 41-First relief valve; 42-Second relief valve; 51-First solenoid pilot valve; 52-First solenoid switching valve; 53-Second solenoid pilot valve; 54-Fourth solenoid switching valve; 61-First check valve; 62-Second check valve; 71-Filter device; 81-Controller; 91-First throttling orifice; 92-Second throttling orifice; 93-Third throttling orifice; 94-Fourth throttling orifice; 1-First pipeline; 2-Second pipeline; 3-Third pipeline; 4-Fourth pipeline; 101-First inlet pipeline; 102-First return pipeline; 103-Second inlet pipeline; 104-Second return pipeline. Detailed Implementation

[0023] The following detailed description of specific embodiments of the present disclosure is provided in conjunction with the accompanying drawings, but is not intended to limit the scope of the present disclosure.

[0024] It should be understood that various modifications can be made to the embodiments disclosed herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of the embodiments disclosed will be apparent to those skilled in the art.

[0025] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the present disclosure and, together with the general description of the embodiments of the present disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the embodiments of the present disclosure.

[0026] These and other features of the embodiments of this disclosure will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0027] It should also be understood that although embodiments of the present disclosure have been described with reference to specific examples, those skilled in the art can certainly implement many other equivalent forms of the embodiments of the present disclosure, which have the features as described in the claims and are therefore all within the scope of protection defined herein.

[0028] The above and other aspects, features and advantages of embodiments of the present disclosure will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0029] Specific embodiments of the present disclosure are described thereafter with reference to the accompanying drawings; however, it should be understood that the disclosed embodiments are merely examples of embodiments of the present disclosure, which may be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that would obscure the embodiments of the present disclosure. Therefore, the specific structural and functional details disclosed herein are not intended to be limiting, but merely to serve as the basis and representative basis for the claims to teach those skilled in the art to use the embodiments of the present disclosure in a variety of substantially any suitable detailed structures.

[0030] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this disclosure 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 embodiments of this disclosure 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 explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0031] This specification may use the phrases “in one embodiment,” “in another embodiment,” “in yet another embodiment,” or “in still another embodiment,” all of which may refer to one or more of the same or different embodiments according to the present disclosure.

[0032] One embodiment of this disclosure provides a logic combination control type electro-hydraulic speed regulation system for mining, such as... Figures 1-4 As shown, the system includes a system inlet P, a system return R, a hydraulic cylinder 11, a valve assembly, and a controller 81. The hydraulic cylinder 11 includes a rodless chamber 11a and a rod chamber 11b, which are separated by a piston. A piston rod is connected to the piston and passes through the rod chamber 11b. The piston rod is connected to an actuator (e.g., a jack), so that the movement of the piston rod drives the movement of the jack, which in turn drives the movement of the hydraulic support.

[0033] Furthermore, the valve assembly includes a first directional valve 21, a second directional valve 31, a first solenoid pilot valve 51, a first solenoid switching valve 52, and a second solenoid pilot valve 53. Here, the first directional valve 21 is a two-stage flow directional valve.

[0034] Specifically, the system inlet P is connected to the inlet of the first reversing valve 21 and the inlet of the second reversing valve 31 via the first inlet pipe 101, the outlet of the first reversing valve 21 is connected to the rodless chamber 11a, and the outlet of the second reversing valve 31 is connected to the rod chamber 11b; the system return end R is connected to the return port of the first reversing valve 21 and the return port of the second reversing valve 31 via the first return pipe 102.

[0035] To control the first electromagnetic pilot valve 51, the first electromagnetic switching valve 52, and the second electromagnetic pilot valve 53, the controller 81 is connected to the control terminals of the first electromagnetic pilot valve 51, the first electromagnetic switching valve 52, and the second electromagnetic pilot valve 53. The system inlet P is connected to the inlet of the first electromagnetic pilot valve 51 and the inlet of the second electromagnetic pilot valve 53 via the second inlet pipe 103, and the system return end R is connected to the return port of the first electromagnetic pilot valve 51, the return port of the electromagnetic switching valve 52, and the return port of the second electromagnetic pilot valve 53 via the second return pipe 104.

[0036] Furthermore, the outlet of the first electromagnetic pilot valve 51 is connected to the control chamber of the first directional valve 21 via the first pipeline 1, and the outlet of the first electromagnetic pilot valve 51 is also connected to the inlet of the first electromagnetic switching valve 52 via the second pipeline 2. Here, a first overflow valve 41 is installed on the second pipeline 2. In this embodiment, the first overflow valve 41 is used to generate back pressure. The outlet of the second electromagnetic pilot valve 53 is connected to the control chamber of the second directional valve 31 via the third pipeline 3.

[0037] Furthermore, a filter device 71 is provided on the second liquid inlet pipeline 103, and the filter device 71 is particularly located between the liquid inlet P of the system and the liquid inlet of the first electromagnetic pilot valve 51 and the second electromagnetic pilot valve 53.

[0038] In addition, a first check valve 61 is provided on the second liquid inlet pipe 103, and the first check valve 61 is particularly located between the liquid inlet P of the system and the filter device 71.

[0039] Furthermore, a second check valve 62 is provided on the second return line 104. The second check valve 62 is particularly located between the system return end R and the first electromagnetic pilot valve 51, the second electromagnetic switch valve 52 and the return port of the second electromagnetic pilot valve 52.

[0040] The logic combination control type electro-hydraulic speed control system for mines described in this embodiment, through the cooperation of electromagnetic switching valves and electromagnetic pilot valves, regulates the flow rate through the directional control valve by controlling the pressure in the control chamber of the directional control valve. This enables functions such as slow extension, rapid extension, and retraction of the hydraulic cylinder. Especially when the hydraulic cylinder needs to extend rapidly, a large flow rate can be provided for control; when precise position control is required, a small flow rate can be provided.

[0041] When the piston rod in the hydraulic cylinder needs to extend slowly: the controller 81 opens the first electromagnetic pilot valve 51. Based on the control of the first electromagnetic pilot valve 51, part of the high-pressure fluid input from the system inlet P enters the first electromagnetic switch valve 52 through the first overflow valve 41 and flows back to the system return end R through the first check valve 61. The remaining part of the high-pressure fluid flows into the control chamber of the first directional valve 21. At this time, under the action of the first overflow valve 41, the control chamber of the first directional valve 21 can only reach the preset pressure Pc.

[0042] Under a preset pressure Pc, the return valve core of the first directional valve 21 is closed, while the inlet valve core is opened at a small flow rate to supply fluid to the rodless chamber 11a of the hydraulic cylinder 11. Simultaneously, since both the second solenoid pilot valve 53 and the second directional valve 31 are in the return position, fluid returns to the rod chamber 11b of the hydraulic cylinder 11, causing the piston inside the hydraulic cylinder 11 to slowly extend the piston rod outward. By controlling the shape and size of the inlet valve core of the first directional valve 21, the output flow rate of the first directional valve 21 can be controlled, thereby controlling the moving speed of the hydraulic cylinder 11.

[0043] When the piston rod in the hydraulic cylinder needs to extend rapidly: the controller 81 simultaneously opens the first solenoid pilot valve 51 and the first solenoid switching valve 52. Since the first solenoid switching valve 52 is in the closed state, the first solenoid pilot valve 51 is in the working position. The high-pressure fluid output from the first solenoid pilot valve 51 is directly input into the control chamber of the first directional valve 21, increasing its internal pressure to the system pressure P0, thereby enabling the first directional valve 21 to open at full flow. Meanwhile, since the third solenoid pilot valve 53 and the second directional valve 31 are in the return fluid position, the rod chamber 11b of the hydraulic cylinder 11 is connected to the system return fluid end R via the second directional valve 31, allowing the piston in the hydraulic cylinder 11 to drive the piston rod to extend rapidly.

[0044] When the piston rod in the hydraulic cylinder needs to retract, the controller 81 opens the second electromagnetic pilot valve 53. Based on the control of the second electromagnetic pilot valve 53, the high-pressure fluid input through the system inlet P enters the control chamber of the second directional valve 31. The control chamber of the second directional valve 31 is pressurized to the system pressure P0, so that the second directional valve 31 is fully open. The rod chamber 11b of the hydraulic cylinder 11 is input with high-pressure fluid, and the rodless chamber 11a is connected to the system return end R through the first directional valve 21. The piston of the hydraulic cylinder 11 drives the piston rod to retract.

[0045] Considering that the first overflow valve 41 is used to generate back pressure, in another embodiment, such as Figure 2 As shown, the first overflow valve 41 can be replaced by two throttling orifices, namely a first throttling orifice 91 and a second throttling orifice 92. The first throttling orifice 91 can be set on the first pipeline 1, especially at the valve downstream of the first electromagnetic pilot valve 51. The second throttling orifice 92 can be set on the second pipeline 2, especially at the valve downstream of the first electromagnetic switch valve 52.

[0046] This embodiment improves the position control accuracy of the hydraulic support jack by providing a mine-use electro-hydraulic directional valve with graded flow control. Specifically, by combining two throttle ports and two solenoid pilot valves, the pressure in the control chamber of the directional valve can be controlled to regulate the flow rate through it. This allows for a large flow rate when the hydraulic cylinder needs to extend rapidly, and a small flow rate when a slow extension is required for precise position control.

[0047] Another embodiment of this disclosure provides a logic combination control type electro-hydraulic speed control system for mining. Unlike the embodiments described above, this electro-hydraulic speed control system can achieve bidirectional control of the extension and retraction of the piston rod, such as... Figure 3 As shown, the second directional valve 31 is a two-stage flow directional valve, which further enables the piston rod in the hydraulic cylinder 11 to also have flow control function during retraction, thereby realizing both slow and fast retraction of the piston rod. Figure 3 As shown, the valve assembly further includes a second solenoid valve 54. The controller 81 is connected to the control terminal of the second solenoid valve 54. The outlet of the second solenoid pilot valve 53 is connected to the inlet of the second solenoid valve 54 via a fourth pipeline 4. A second overflow valve 42 is installed on the fourth pipeline 4. The return port of the second solenoid valve 54 is connected to the second return pipeline 104 to connect the system return terminal R. In this embodiment, both the first overflow valve 41 and the second overflow valve 42 are used to generate back pressure.

[0048] The logic combination control type electro-hydraulic speed control system for mining described in this embodiment can realize functions such as slow extension, rapid extension, slow retraction, and rapid retraction of the piston rod in the hydraulic cylinder, wherein:

[0049] When the piston rod in the hydraulic cylinder needs to extend slowly: the controller 81 opens the first electromagnetic pilot valve 51. Based on the control of the first electromagnetic pilot valve 51, part of the high-pressure liquid input at the system inlet P flows back to the system return end R through the first overflow valve 41, the second electromagnetic switch valve 52, and the second check valve 62. The remaining part of the high-pressure liquid flows into the control chamber of the first directional valve 21. At this time, under the action of the first overflow valve 41, the control chamber of the first directional valve 21 can only reach the preset pressure Pc.

[0050] Under a preset pressure Pc, the return valve core of the first directional valve 21 is closed, while the inlet valve core is opened at a small flow rate to supply fluid to the rodless chamber 11a of the hydraulic cylinder 11. Simultaneously, since both the second solenoid pilot valve 53 and the second solenoid switching valve 54 are in the return position, fluid returns to the rod chamber 11b of the hydraulic cylinder 11, causing the piston within the hydraulic cylinder 11 to slowly extend its piston rod outward. The output flow rate of the first directional valve 21 can be controlled by adjusting the shape and size of its valve core, thereby controlling the piston's movement speed within the hydraulic cylinder 11.

[0051] When the piston rod in the hydraulic cylinder needs to extend rapidly: the controller 81 simultaneously opens the first solenoid pilot valve 51 and the second solenoid switching valve 52. Since the second solenoid switching valve 52 is in the off state, the first solenoid pilot valve 51 is in the working position. The high-pressure fluid output from the first solenoid pilot valve 51 connects to the control chamber of the first directional valve, increasing its internal pressure to the system pressure P0, thus enabling the first directional valve 21 to open at full flow. Meanwhile, since the second solenoid pilot valve 53 and the second solenoid switching valve 54 are in the return fluid position, the rod chamber 11b of the hydraulic cylinder 11 connects to the system return fluid end R via the second directional valve 22, causing the piston in the hydraulic cylinder 11 to drive the piston rod to extend rapidly.

[0052] When the piston rod in the hydraulic cylinder needs to retract slowly: the controller 81 opens the second electromagnetic pilot valve 53. Based on the control of the second electromagnetic pilot valve 53, part of the high-pressure fluid input at the system inlet P flows back to the system return end R through the second overflow valve 42, the second electromagnetic switch valve 54, and the second check valve 62. The remaining part of the high-pressure fluid flows into the control chamber of the second directional valve 22. At this time, under the action of the second overflow valve 42, the control chamber of the second directional valve 22 can only reach the preset pressure Pc.

[0053] Under a preset pressure Pc, the return valve core of the second directional valve 22 is closed, while the inlet valve core is opened at a small flow rate to supply fluid to the rod chamber 11b of the hydraulic cylinder 11. Simultaneously, since both the first solenoid pilot valve 51 and the first solenoid switching valve 52 are in the return position, fluid returns to the rodless chamber 11a of the hydraulic cylinder 11, causing the piston within the hydraulic cylinder 11 to slowly retract its piston rod. The output flow rate of the second directional valve 22 can be controlled by adjusting the shape and size of the valve core, thereby controlling the movement speed of the piston within the hydraulic cylinder 11.

[0054] When rapid retraction of the piston rod in the hydraulic cylinder is required: the controller 81 simultaneously opens the second solenoid pilot valve 53 and the second solenoid switching valve 54. Since the second solenoid switching valve 54 is in the closed state, the second solenoid pilot valve 53 is in the working position. The high-pressure fluid output by the second solenoid pilot valve 53 flows directly into the control chamber of the second directional valve 22, increasing its internal pressure to the system pressure P0, thus enabling the second directional valve 22 to open at full flow. Meanwhile, since the first solenoid pilot valve 51 and the first solenoid switching valve 52 are in the return fluid position, the rodless chamber 11a of the hydraulic cylinder 11 is connected to the system return fluid end R via the first directional valve 21, and the piston in the hydraulic cylinder 11 drives the piston rod to retract rapidly.

[0055] Considering that the first overflow valve 41 is used to generate back pressure, in another embodiment, such as Figure 4As shown, the first overflow valve 41 can be replaced by four throttling orifices, namely a first throttling orifice 91, a second throttling orifice 92, a third throttling orifice 93, and a fourth throttling orifice 94. The first throttling orifice 91 can be provided on the first pipeline 1, especially at the downstream position of the first electromagnetic pilot valve 51; the second throttling orifice 92 can be provided on the second pipeline 2, especially at the downstream position of the first electromagnetic switch valve 52; the third throttling orifice 93 can be provided on the third pipeline 3, especially at the downstream position of the second electromagnetic pilot valve 53; and the fourth throttling orifice 94 can be provided on the fourth pipeline 4, especially at the downstream position of the second electromagnetic switch valve 52.

[0056] This embodiment uses a mine-use electro-hydraulic directional valve with graded flow control to improve the jack position control accuracy of the hydraulic support. The combination of two throttle ports and two solenoid pilot valves can control the pressure in the control chamber of the directional valve to regulate the flow rate through the directional valve. When the hydraulic cylinder needs to extend quickly, a large flow rate is achieved; when the hydraulic cylinder needs to extend slowly, a small flow rate is achieved, thereby accurately controlling the position of the hydraulic support.

[0057] Another embodiment of this disclosure provides a hydraulic support assembly, which includes a hydraulic support, a jack, and a differential pressure throttling type electro-hydraulic speed control system for mining as described in any of the above embodiments. The logic combination controls the electro-hydraulic speed control system for mining to drive the movement of the jack, thereby driving the movement of the hydraulic support through the jack.

[0058] This disclosure discloses a mine-use electro-hydraulic directional valve that improves the position control accuracy of hydraulic support jacks by providing graded flow control. The valve utilizes a relief valve or throttle orifice in conjunction with a solenoid pilot valve to control the pressure in the control chamber, thereby regulating the flow rate through the directional valve. A large flow rate is provided when the hydraulic cylinder needs to extend rapidly, and a small flow rate is provided when the hydraulic cylinder needs to extend slowly for precise position control.

[0059] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0060] 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.

[0061] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0062] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A logic combination control type electro-hydraulic speed regulation system for mines, characterized in that, The system includes a system inlet, a system return, a hydraulic cylinder, a valve assembly, and a controller. The hydraulic cylinder includes a rodless chamber and a rod chamber. The valve assembly includes a first directional valve, a second directional valve, a first solenoid pilot valve, a first solenoid switching valve, and a second solenoid pilot valve. The controller is connected to the control terminals of the first solenoid pilot valve, the first solenoid switching valve, and the second solenoid pilot valve. The system inlet is connected to the inlets of the first directional valve, the second directional valve, the first solenoid pilot valve, and the second solenoid pilot valve. The outlet of the first solenoid pilot valve is connected to the control chamber of the first directional valve and the inlet of the first solenoid switching valve, respectively. The outlet of the second solenoid pilot valve is connected to the control chamber of the second directional valve. The outlets of the first directional valve and the second directional valve are connected to the rodless chamber and the rod chamber, respectively. A first relief valve is provided between the outlet of the first solenoid pilot valve and the inlet of the first solenoid switching valve, or a throttling orifice is provided downstream of the first solenoid directional valve and the first solenoid switching valve, respectively.

2. The logic combination control type electro-hydraulic speed regulation system for mines according to claim 1, characterized in that, The system's return end is connected to the return ports of the first and second electromagnetic pilot valves.

3. The logic combination control type electro-hydraulic speed regulation system for mines according to claim 2, characterized in that, The system's inlet end is connected to the inlet of the first directional valve and the inlet of the second directional valve via a first inlet pipe, and to the inlet of the first electromagnetic pilot valve and the second electromagnetic pilot valve via a second inlet pipe. The system's return end is connected to the return port of the first directional valve and the return port of the second directional valve via a first return pipe, and to the return ports of the first electromagnetic pilot valve, the electromagnetic switching valve, and the second electromagnetic pilot valve via a second return pipe.

4. The logic combination control type electro-hydraulic speed regulation system for mines according to claim 3, characterized in that, The outlet of the first electromagnetic pilot valve is connected to the control chamber of the first directional valve through a first pipeline and to the inlet of the first electromagnetic switch valve through a second pipeline. The first overflow valve is installed on the second pipeline. The outlet of the second electromagnetic pilot valve is connected to the control chamber of the second directional valve through a third pipeline.

5. The logic combination control type electro-hydraulic speed regulation system for mines according to claim 4, characterized in that, A filter device is installed on the second inlet pipeline, and the filter device is located between the inlet end of the system and the inlet of the first electromagnetic pilot valve and the second electromagnetic pilot valve.

6. The logic combination control type electro-hydraulic speed regulation system for mines according to claim 5, characterized in that, A first check valve is provided on the second inlet pipe, which is located between the system inlet and the filter device. A second check valve is provided on the second return pipe, which is located between the system return and the first electromagnetic pilot valve, the second electromagnetic switch valve, and the return port of the second electromagnetic pilot valve.

7. The logic combination control type electro-hydraulic speed regulation system for mines according to any one of claims 1-6, characterized in that, The first reversing valve and / or the second reversing valve are two-stage flow reversing valves.

8. The logic combination control type electro-hydraulic speed regulation system for mines according to claim 7, characterized in that, When the second reversing valve is a two-stage flow reversing valve, the valve assembly further includes a second solenoid switch valve. The controller is connected to the control terminal of the second solenoid switch valve. The outlet of the second solenoid pilot valve is connected to the inlet of the second solenoid switch valve through a fourth pipeline. The return port of the second solenoid switch valve is connected to the return terminal of the system.

9. The logic combination control type electro-hydraulic speed regulation system for mines according to claim 8, characterized in that, A second relief valve is provided on the fourth pipeline, or throttling orifices are provided at the downstream positions of the first electromagnetic directional valve, the first electromagnetic switch valve, the second electromagnetic pilot valve, and the second electromagnetic switch valve, respectively.

10. A hydraulic support assembly, characterized in that, It includes hydraulic supports, jacks, and a logic combination control type electro-hydraulic speed regulation system for mining, as described in any one of claims 1-9.

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