A hydraulic support push-pull frame hydraulic control system

Abstract

This invention relates to the field of hydraulic support technology and discloses a hydraulic support push-pull hydraulic control system. The hydraulic support push-pull hydraulic control system includes a main inlet pipe, a main return pipe, a main valve, a push jack, a first pipe, a second pipe, and a bypass pipe. The main valve includes a pull-pull function port and a push-pull function port, both of which can be connected to one of the main inlet pipe and the main return pipe. The push jack has a first chamber and a second chamber. The first pipe connects to the first chamber through the pull-pull function port, and the second pipe connects to the second chamber through the push-pull function port. The bypass pipe connects the main inlet pipe and the second chamber, allowing liquid in the main inlet pipe to flow towards the second chamber. This invention achieves increased push-pull speed by adding a bypass without requiring additional control components, enabling both rapid and precise push-pull operation.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic support technology, specifically relating to a hydraulic control system for a hydraulic support push-pull frame. Background Technology

[0002] Currently, some well-manufactured hydraulic supports, when used according to standardized procedures, can be reused after a 10-year overhaul. However, when these overhauled hydraulic supports are applied to other working faces and integrated with new scraper conveyors, they often face issues such as slow moving speeds and failure to meet design requirements, severely hindering safe and efficient production at the working face. The slow moving speed is mainly due to insufficient fluid flow in the cylinders of the moving jacks. To ensure economic efficiency, the main valve is usually not replaced during hydraulic support overhauls, and the limited flow rate at the moving port of the main valve makes it difficult to increase the moving speed. Related technologies include increasing the flow rate of the hydraulic support by adding bypass inlet and bypass return channels to improve the moving speed. However, this method completely abandons the original circuitry, resulting in high costs, and the newly added high-flow-rate channels cannot meet the requirements for precise moving. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose a hydraulic support push-pull frame hydraulic control system. This hydraulic support push-pull frame hydraulic control system requires minimal modification, has low cost, and can meet the dual requirements of rapid and precise push-pull.

[0004] The hydraulic support system of the present invention includes:

[0005] Main inlet pipe;

[0006] Main return pipeline;

[0007] The main valve includes a pull-out port and a push-flow port; both the pull-out port and the push-flow port can be connected to one of the main inlet pipe and the main return pipe.

[0008] A push-pull jack, wherein the push-pull jack has a first chamber and a second chamber;

[0009] A first conduit connects the first chamber to the pull-out functional port;

[0010] The second pipe connects the second chamber to the push-pull function port;

[0011] A bypass pipe connects the main inlet pipe to the second chamber, so that the liquid in the main inlet pipe flows toward the second chamber.

[0012] The hydraulic support push-pull hydraulic control system of this invention uses a newly added bypass pipe to assist the original second pipe in the push-pull operation. The bypass pipe bypasses the push-pull function port of the main valve, thereby greatly improving the push-pull speed. Furthermore, the original wiring does not need to be discarded; the original pipeline can still be used for the pull-up operation, resulting in low modification costs and a significant increase in push-pull speed.

[0013] Optionally, the hydraulic support push-pull frame hydraulic control system further includes a bypass hydraulic control check valve. The bypass hydraulic control check valve is located on the bypass pipeline. The inlet of the bypass hydraulic control check valve is connected to the second chamber, the outlet of the bypass hydraulic control check valve is connected to the main inlet pipeline, and the control port of the bypass hydraulic control check valve is connected to the second pipeline. This allows the bypass hydraulic control check valve to allow the liquid in the main inlet pipeline to flow towards the second chamber when the push-pull function port is connected to the main inlet pipeline.

[0014] Optionally, the hydraulic support push-pull frame hydraulic control system further includes a bypass check valve, which is located on the bypass pipeline. The inlet of the bypass check valve is connected to the inlet of the bypass hydraulic control check valve, and the outlet of the bypass check valve is connected to the second chamber. The bypass check valve allows the liquid flowing out of the bypass hydraulic control check valve to flow unidirectionally towards the second chamber.

[0015] Optionally, the hydraulic support push-pull frame hydraulic control system further includes a push-pull hydraulic control check valve, which is located on the second pipeline. The inlet of the push-pull hydraulic control check valve is connected to the push-pull function port, the outlet of the push-pull hydraulic control check valve is connected to the second chamber, and the control port of the push-pull hydraulic control check valve is connected to the first pipeline.

[0016] Optionally, the pushing jack is provided with an interface that communicates with the second chamber, and the hydraulic support push-pull frame hydraulic control system further includes a tee that connects the interface with the second pipeline and the bypass pipeline.

[0017] Optionally, the hydraulic support push-pull frame hydraulic control system further includes a safety valve, which is located on the second pipeline between the three-way valve and the push-pull hydraulic control check valve, so that the safety valve can release pressure when the pressure in the second pipeline or the bypass pipeline pressure exceeds a safe value.

[0018] Optionally, the hydraulic support push-pull frame hydraulic control system further includes a spray function port, which can be connected to one of the main inlet pipe and the main return pipe. The spray function port is connected to a spray assembly, and the spray function port is used to control the spray assembly to open or close the spray.

[0019] Optionally, the hydraulic support push-pull frame hydraulic control system further includes a hydraulically controlled throttle valve, which is located on the bypass pipeline. One side of the hydraulically controlled throttle valve is connected to the main inlet pipeline, and the other side of the hydraulically controlled throttle valve is connected to the outlet of the bypass hydraulically controlled check valve. The control port of the hydraulically controlled throttle valve is connected to the spray function port, so that the valve opening of the hydraulically controlled throttle valve can be reduced when the spray function port is connected to the main inlet pipeline.

[0020] Optionally, the hydraulic support push-pull frame hydraulic control system further includes a main throttle valve, which is located on the bypass pipeline. One side of the main throttle valve is connected to the main inlet pipeline, and the other side of the main throttle valve is connected to the outlet of the bypass hydraulic control check valve. The main throttle valve is used to control the flow rate and pressure of the bypass pipeline.

[0021] Optionally, the spray assembly includes a water spray pipe, one end of which is connected to a nozzle, and the other end of which is connected to a water source. The water spray pipe is equipped with a water spray control valve, the control port of which is connected to the spray function port, so that when the spray function port is connected to the main liquid inlet pipe, the valve of the water spray control valve is opened.

[0022] The hydraulic support push-pull frame hydraulic control system of this invention adds a bypass pipeline and installs a bypass hydraulic control check valve and a bypass check valve on the bypass pipeline, and uses the existing second pipeline to control the bypass hydraulic control check valve. This achieves synchronous control of the bypass pipeline without the need for additional control components, still relying on the push-pull function port of the main valve, realizing sensorless operation and increasing the push-pull speed without increasing learning costs. In addition, a water spray hydraulic control valve is added, using the existing spray function port on the main valve for control, to throttle the bypass pipeline and thus achieve precise push-pull. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall invention.

[0024] Figure 2 This is a partial schematic diagram of the present invention.

[0025] Figure 3 This is a schematic diagram of the pushing and sliding state of the present invention.

[0026] Figure 4 This is a schematic diagram of the pull frame state of the present invention.

[0027] Figure label:

[0028] 1. Main liquid inlet pipe;

[0029] 2. Main return fluid pipeline;

[0030] 3. Main valve; 31. Pull-out port; 32. Push-out port; 33. Spray port;

[0031] 4. Moving the jack; 41. First chamber; 42. Second chamber;

[0032] 5. First pipeline;

[0033] 6. Second pipeline;

[0034] 7. Bypass pipes;

[0035] 8. Bypass hydraulic check valve;

[0036] 9. Bypass check valve;

[0037] 10. Push-type hydraulic control check valve;

[0038] 11. Three-way connector;

[0039] 12. Safety valve;

[0040] 13. Spray assembly; 131. Spray pipe; 132. Nozzle; 133. Spray hydraulic control valve;

[0041] 14. Hydraulic control throttle valve;

[0042] 15. Main throttle valve. Detailed Implementation

[0043] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0044] This embodiment describes a hydraulic control system for a hydraulic support push-pull mechanism, applied to a mining hydraulic support. It includes a main inlet pipe 1, a main return pipe 2, a main valve 3, a pushing jack 4, a first pipe 5, a second pipe 6, and a bypass pipe 7. The main valve 3 includes a pull-pull function port 31 and a push-pull function port 32.

[0045] Both the pull-out port 31 and the push-flow port 32 can be connected to one of the main inlet pipe 1 and the main return pipe 2. The push-flow jack 4 has a first chamber 41 and a second chamber 42. The first pipe 5 connects the first chamber 41 to the pull-out port 31. The second pipe 6 connects the second chamber 42 to the push-flow port 32. The bypass pipe 7 connects the main inlet pipe 1 to the second chamber 42, so that the liquid in the main inlet pipe 1 flows toward the second chamber 42.

[0046] In fully mechanized coal mining operations, "pushing the conveyor" refers to the operation of using the thrust of the pushing jack 4 on the hydraulic support to push the scraper conveyor towards the coal face. "Pulling the support" refers to the operation of using the pulling force of the pushing jack 4 on the hydraulic support to pull the hydraulic support itself towards the scraper conveyor. Pushing the conveyor and pulling the support are achieved through the pushing port 32 and pulling port 31 on the main valve 3.

[0047] The specific operation is as follows: In the initial state, all function ports on the main valve 3 are connected to the main return fluid pipe 2. When push-pull is required, by operating the control part corresponding to the push-pull function port 32, the push-pull function port 32 can be connected to the main inlet fluid pipe 1. The liquid in the main inlet fluid pipe 1 will enter the second chamber 42 of the hydraulic jack through the push-pull function port 32 and the second pipe 6, realizing push-pull. At the same time, the main inlet fluid pipe 1 enters the second chamber 42 through the bypass pipe 7 to assist in push-pull, thereby increasing the push-pull speed. During push-pull, the liquid in the first chamber 41 will flow into the main return fluid pipe 2 through the first pipe 5 and the pull-frame function port 31. When pull-frame is required, by operating the control part on the main valve 3 corresponding to the pull-frame function port 31, the pull-frame function port 31 can be connected to the main inlet fluid pipe 1. The liquid in the main inlet fluid pipe 1 will enter the first chamber 41 of the hydraulic jack through the pull-frame function port 31 and the first pipe 5, realizing pull-frame. At this time, the bypass pipe 7 can be closed, and the liquid in the second chamber 42 will flow into the main return pipe 2 along the second pipe 6 and the push-pull function port 32.

[0048] The hydraulic support push-pull frame hydraulic control system of this embodiment increases the flow rate and improves the pushing speed by adding a bypass pipe 7 without modifying the original pipeline. Furthermore, the original pipeline continues to perform some functions. Compared to the complete abandonment method in related technologies, this saves costs, increases flow rate, and requires less additional pipeline.

[0049] In some specific embodiments, each functional port of the main valve 3 is composed of a pilot valve and a post-functional valve. The pilot valve is a solenoid two-position three-way valve, and the post-functional valve is a hydraulically controlled two-position three-way valve. Both the pilot valve and the post-functional valve have one common port and two working ports. The two working ports of the two valves are respectively connected to the main inlet pipe 1 and the main return pipe 2. The common port of the post-functional valve is connected to the functional port via a pipe. The common port of the post-functional valve can be regarded as the functional port. This sequentially enables the functional ports on the main valve to be connected to the main inlet pipe 1 and the main return pipe 2 respectively. The post-functional valve also has a control port, and the common port of the pilot valve is connected to the control port of the post-functional valve via a pipe. When the pilot valve is energized, the common port of the pilot valve can first connect to the main inlet pipe 1, and then the fluid will enter the control port of the post-functional valve to create pressure in the control port. After the post-functional valve is activated, the common port of the post-functional valve connects to the main inlet pipe 1. This embodiment enables the switching of liquid inlet or liquid return at each functional port on the main valve 3.

[0050] In some specific embodiments, the main inlet pipe 1 is connected to the emulsion pump station, and the main inlet pipe 1 is also equipped with an overflow valve, filter, etc., to prevent blockages in the entire system. The main return pipe 2 is connected to the emulsion tank; the emulsion pump station provides pressure to the entire system.

[0051] In some specific embodiments, the push jack 4 has a rod-type chamber and a rodless chamber. In this embodiment, the first chamber 41 is the rodless chamber, and the second chamber 42 is the rod-type chamber. The push jack 4 uses a reverse installation method: the piston rod end of the push jack 4 is fixed, and the cylinder of the push jack 4 is connected to the chute. When pushing the chute: the cylinder extends, pushing the scraper conveyor towards the coal wall; when pulling the support: the cylinder retracts, pulling the support towards the scraper conveyor (away from the coal wall). The reverse installation method is suitable for steeply inclined coal seams and avoids the piston rod being scratched or contaminated by coal gangue, resulting in a longer service life for the seals of the push jack 4.

[0052] In some specific embodiments, the bypass pipe 7 can be equipped with a valve for active opening and closing, or a flow control valve, to coordinate with the push-pull and pull-pull operations. The diameter of the bypass pipe 7 is larger than that of the first pipe 5 and the second pipe 6, which can increase the flow rate and pressure of the entire system during push-pull operations.

[0053] In some embodiments, the hydraulic control system of the hydraulic support push-pull frame further includes a bypass hydraulic control check valve 8, which is disposed on the bypass pipe 7. The inlet of the bypass hydraulic control check valve 8 is connected to the second chamber 42, the outlet of the bypass hydraulic control check valve 8 is connected to the main inlet pipe 1, and the control port of the bypass hydraulic control check valve 8 is connected to the second pipe 6 so that when the push-pull function port 32 is connected to the main inlet pipe 1, the bypass hydraulic control check valve 8 can allow the liquid in the main inlet pipe 1 to flow toward the second chamber 42.

[0054] In this embodiment, a bypass hydraulic control check valve 8 is installed on the bypass pipe 7, and the bypass hydraulic control check valve 8 is installed in reverse. In other words, in the initial state, the fluid in the main inlet pipe 1 cannot enter the second chamber 42 through the bypass hydraulic control check valve 8. When push-flow is not required, the bypass pipe 7 is in a closed state. Only when push-flow is required can the control port of the bypass hydraulic control check valve 8 receive pressure through the second pipe 6. At this time, the valve of the bypass hydraulic control check valve 8 is fully opened, presenting a bidirectional flow state, and the fluid in the main inlet pipe 1 can flow towards the second chamber 42. The control port of the bypass hydraulic control check valve 8 utilizes the pressure in the second pipe 6, eliminating the need for additional control components. When the push-flow function is activated, the state of the bypass hydraulic control check valve 8 can be automatically switched to achieve flow through the bypass pipe 7. This achieves sensorless operation.

[0055] In some embodiments, the hydraulic support push-pull frame hydraulic control system further includes a bypass check valve 9, which is disposed on the bypass pipe 7. The inlet of the bypass check valve 9 is connected to the inlet of the bypass hydraulic control check valve 8, and the outlet of the bypass check valve 9 is connected to the second chamber 42. The bypass check valve 9 allows the liquid flowing out of the bypass hydraulic control check valve 8 to flow unidirectionally towards the second chamber 42.

[0056] In this embodiment of the hydraulic support push-pull hydraulic control system, a bypass check valve 9 is installed between the second chamber 42 and the bypass hydraulic control check valve 8. The bypass check valve 9 allows fluid in the main inlet pipe 1 to flow unidirectionally towards the second chamber 42. Through the cooperation of the bypass hydraulic control check valve 8 and the bypass check valve 9, the entire bypass pipe 7 is kept closed during the pull-pull operation. Only during the push-pull operation can fluid enter the second chamber 42 unidirectionally along the bypass pipe 7, ensuring that the inlet and outlet fluids do not interfere with each other on the bypass pipe 7.

[0057] The specific pushing and sliding operation is as follows: See appendix Figure 3First, operate the pilot valve corresponding to the push-pull function port 32 to connect the push-pull function port 32 with the main inlet pipe 1, while the pull-pull function port 31 remains connected to the main return pipe 2. At this time, the fluid will flow along the second pipe 6 towards the second chamber 42. Part of the fluid will enter the second chamber 42, and the other part will control the bypass hydraulic control check valve 8 to open. Then, after the bypass hydraulic control check valve 8 opens, the fluid in the main inlet pipe 1 will enter the second chamber 42 along the bypass hydraulic control check valve 8. Due to the larger diameter of the bypass pipe 7 and the absence of many accessories on the pipe, the flow rate and pressure of the fluid in the bypass pipe 7 are both relatively high. Part of the fluid in the bypass pipe 7 will flow back along the second pipe 6, and upon encountering the push-pull hydraulic control check valve 10, it will be blocked by the push-pull hydraulic control check valve 10, preventing backflow in the second pipe 6. The fluid in the bypass pipe 7 will then enter the second chamber 42 to achieve the push-pull function. The fluid in the corresponding first chamber 41 will enter the puller function port 31 along the first pipe 5, and finally flow into the main return pipe 2. After the push-pull is completed, the pilot valve corresponding to the push-pull function port 32 will be reset.

[0058] The specific steps for pulling the frame are as follows: See appendix. Figure 4 First, operate the pilot valve corresponding to the pull-out function port 31 to connect the pull-out function port 31 with the main inlet pipe 1. At this time, the push-pull function port 32 remains connected to the main return pipe 2. Fluid will enter the first chamber 41 along the first pipe 5 to realize the pull-out function. The fluid in the corresponding second chamber 42 flows along the bypass pipe 7 to the bypass check valve 9 and is blocked. The fluid in the second chamber 42 will eventually flow along the second pipe 6 towards the push-pull function port 32 and finally flow into the main return pipe 2. After the pull-out is completed, reset the pilot valve corresponding to the pull-out function port 31.

[0059] In some embodiments, the hydraulic control further includes a push-flow hydraulic control check valve 10, which is disposed on the second pipeline 6. The inlet of the push-flow hydraulic control check valve 10 is connected to the push-flow function port 32, the outlet of the push-flow hydraulic control check valve 10 is connected to the second chamber 42, and the control port of the push-flow hydraulic control check valve 10 is connected to the first pipeline 5.

[0060] In this embodiment, a push-flow hydraulic control check valve 10 is provided on the second pipe 6. Under normal conditions, the fluid in the second pipe 6 can flow unidirectionally towards the second chamber 42, preventing backflow in the second pipe 6 when the pushing resistance is high. In other words, it ensures that the flow can only go forward and not backward. Furthermore, the control port of the push-flow hydraulic control check valve 10 is connected to the first pipe 5. During the pulling process, the fluid in the first pipe 5 enters the control port of the push-flow hydraulic control check valve 10, causing the valve to fully open and lose its unidirectional function. This ensures that the second pipe 6 can handle normal backflow during the pulling process.

[0061] In some embodiments, the push jack 4 is provided with an interface that communicates with the second chamber 42. The hydraulic support push-pull frame hydraulic control system also includes a tee 11, which connects the interface with the second pipe 6 and the bypass pipe 7. Through this embodiment, the push jack 4 does not need to have an additional interface; the bypass pipe can be added using the original interface, reducing modification costs.

[0062] In some embodiments, the hydraulic control further includes a safety valve 12, which is disposed on the second pipeline 6 and located between the three-way valve 11 and the push-pull hydraulic control check valve 10. The safety valve 12 is used to relieve pressure when the pressure in the second pipeline 6 or the bypass pipeline 7 exceeds a safe value. In the hydraulic support push-pull frame hydraulic control system of this embodiment, the safety valve 12 can be reused. That is, it can relieve pressure when the pressure in the second pipeline 6 is too high, and it can also relieve pressure when the pressure in the bypass pipeline 7 is too high. One safety valve 12 achieves pressure relief on both pipelines, ensuring safety during push-pull operation.

[0063] In some embodiments, the hydraulic control further includes a spray port 33, which can be connected to one of the main inlet pipe 1 and the main return pipe 2. The spray port 33 is connected to a spray assembly 13 and is used to control the spray assembly 13 to open or close the spray. The spray assembly 13 includes a water spray pipe 131, one end of which is connected to a nozzle 132, and the other end of which is connected to a water source. A water spray control valve 133 is provided on the water spray pipe 131, and the control port of the water spray control valve 133 is connected to the spray port 33 so that when the spray port 33 is connected to the main inlet pipe 1, the valve of the water spray control valve 133 is opened. Through the design of the spray port 33, dust suppression of the surrounding area can be achieved by spraying.

[0064] In some embodiments, the hydraulic control further includes a hydraulically controlled throttle valve 14, which is disposed on the bypass pipeline 7. One side of the hydraulically controlled throttle valve 14 is connected to the main inlet pipeline 1, and the other side of the hydraulically controlled throttle valve 14 is connected to the outlet of the bypass hydraulically controlled check valve 8. The control port of the hydraulically controlled throttle valve 14 is connected to the spray function port 33, so that the valve opening of the hydraulically controlled throttle valve 14 can be reduced when the spray function port 33 is connected to the main inlet pipeline 1.

[0065] In this embodiment, the hydraulic support push-pull hydraulic control system adds a hydraulically controlled throttle valve 14 to the existing bypass pipe 7. The control port of the hydraulically controlled throttle valve 14 is connected to the spray function port 33. Thus, when the spray function port 33 is connected to the main inlet pipe 1, not only can the spray assembly 13 be opened, but the hydraulically controlled throttle valve 14 can also be controlled, reducing its opening degree. This slows down the flow rate on the bypass pipe 7, achieving precise push-pull. In other words, to achieve precise push-pull, both the pilot valves corresponding to the pull-up function port 31 and the pilot valves corresponding to the spray function port 33 need to be operated simultaneously. Since opening and closing the spray does not affect the push-pull function, precise push-pull can be achieved without separately occupying the main valve 3 function port. This avoids the problem of excessive flow and excessive movement speed in the bypass pipe 7, achieving precise control. That is, when the original push-pull function port is open, it is in a rapid push-pull state; when precise push-pull is needed, the spray function port is opened.

[0066] In some embodiments, the hydraulic support push-pull frame hydraulic control system further includes a main throttle valve 15, which is located on the bypass pipeline 7. One side of the main throttle valve 15 is connected to the main inlet pipeline 1, and the other side of the main throttle valve 15 is connected to the outlet of the bypass hydraulic control check valve 8. The main throttle valve 15 is used to control the flow rate and pressure of the bypass pipeline 7.

[0067] The hydraulic support push-pull frame hydraulic control system of this implementation utilizes the cooperation of the hydraulically controlled throttle valve 14 and the main throttle valve 15. The main throttle valve 15 acts as the maximum flow regulating valve, and after adjustment, it remains essentially stationary, eliminating the need for difficult manual operation later. When precise pushing is required, remote control is achieved through the hydraulically controlled throttle valve 14. This allows all requirements to be met using the system's own interface, eliminating the need for additional control units, saving costs, simplifying modifications, and making operation easy to learn.

[0068] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0069] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0070] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0071] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0072] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0073] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A hydraulic control system for a hydraulic support push-pull frame, characterized in that, include: Main inlet pipe (1); Main return pipeline (2); The main valve (3) includes a pull-out port (31) and a push-out port (32); both the pull-out port (31) and the push-out port (32) can be connected to one of the main inlet pipe (1) and the main return pipe (2); Push jack (4), the push jack (4) having a first chamber (41) and a second chamber (42); The first pipe (5) connects the first chamber (41) to the pull frame functional port (31). The second pipe (6) connects the second chamber (42) to the push-pull function port (32); A bypass pipe (7) connects the main inlet pipe (1) to the second chamber (42) so that the liquid in the main inlet pipe (1) flows toward the second chamber (42); A bypass hydraulic control check valve (8) is provided on the bypass pipeline (7). The inlet of the bypass hydraulic control check valve (8) is connected to the second chamber (42), and the outlet of the bypass hydraulic control check valve (8) is connected to the main inlet pipeline (1). The control port of the bypass hydraulic control check valve (8) is connected to the second pipeline (6) so that when the push-pull function port (32) is connected to the main inlet pipeline (1), the bypass hydraulic control check valve (8) can make the liquid in the main inlet pipeline (1) flow toward the second chamber (42). A bypass check valve (9) is provided on the bypass pipeline (7). The inlet of the bypass check valve (9) is connected to the inlet of the bypass hydraulic check valve (8), and the outlet of the bypass check valve (9) is connected to the second chamber (42). The bypass check valve (9) allows the liquid flowing out of the bypass hydraulic check valve (8) to flow unidirectionally into the second chamber (42). A push-flow hydraulic control check valve (10) is provided on the second pipeline (6). The inlet of the push-flow hydraulic control check valve (10) is connected to the push-flow function port (32), the outlet of the push-flow hydraulic control check valve (10) is connected to the second chamber (42), and the control port of the push-flow hydraulic control check valve (10) is connected to the first pipeline (5). The spray function port (33) can be connected to one of the main liquid inlet pipe (1) and the main liquid return pipe (2). The spray function port (33) is connected to a spray assembly (13). The spray function port (33) is used to control the spray assembly (13) to open or close the spray. A hydraulic throttle valve (14) is provided on the bypass pipe (7). One side interface of the hydraulic throttle valve (14) is connected to the main inlet pipe (1), and the other side interface of the hydraulic throttle valve (14) is connected to the outlet of the bypass hydraulic check valve (8). The control port of the hydraulic throttle valve (14) is connected to the spray function port (33) so that the valve opening of the hydraulic throttle valve (14) can be reduced when the spray function port (33) is connected to the main inlet pipe (1). The main throttle valve (15) is located on the bypass pipeline (7). One side of the main throttle valve (15) is connected to the main inlet pipeline (1), and the other side of the main throttle valve (15) is connected to the outlet of the bypass hydraulic check valve (8). The main throttle valve (15) is used to control the flow rate and pressure of the bypass pipeline (7). The spray assembly (13) includes a water spray pipe (131), one end of which is connected to a nozzle (132), and the other end of which is used to connect to a water source. A water spray control valve (133) is provided on the water spray pipe (131), and the control port of the water spray control valve (133) is connected to the spray function port (33) so that when the spray function port (33) is connected to the main liquid inlet pipe (1), the valve of the water spray control valve (133) is opened.

2. The hydraulic control system for the hydraulic support push-pull frame according to claim 1, characterized in that, The pushing jack (4) is provided with an interface, which is connected to the second chamber (42). The hydraulic support push-pull frame hydraulic control system also includes a tee (11), which connects the interface to the second pipe (6) and the bypass pipe (7).

3. The hydraulic control system for the hydraulic support push-pull frame according to claim 2, characterized in that, It also includes a safety valve (12), which is located on the second pipeline (6) and between the three-way valve (11) and the push-pull hydraulic control check valve (10) so that the safety valve (12) can be used to release pressure when the pressure in the second pipeline (6) or the pressure in the bypass pipeline (7) is greater than a safe value.

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