Impact-resistant adjusting system and method for large-mining-height hydraulic support

Abstract

The invention discloses a large-mining-height hydraulic support anti-impact adjusting system and method. The large-mining-height hydraulic support anti-impact adjusting system comprises a stand column, a reversing valve, a pump station, a first energy accumulator and a hydraulic support. When the hydraulic support is impacted by mine pressure, instantly-increased pressure of hydraulic oil in the first oil cavity can be rapidly absorbed, the system can rapidly respond to the mine pressure impact, and the pressure borne by the stand column in the initial stage of impact is reduced. Damage of mine pressure impact to the stand column is effectively relieved, the service life of the stand column is prolonged, overall stability of a working face in the coal recovery process can be kept, and safety and efficiency of coal production are improved. Due to the fact that the system can more effectively cope with mine pressure impact, the downtime caused by damage of the stand column is shortened, and the production cost is reduced. In addition, the system can provide extra oil liquid during pressure fluctuation or absorb redundant oil liquid during impact, so that the pressure in the stand column is kept stable, and the buffering and adjusting capacity of the system is improved.

Description

Technical Field

[0001] This invention relates to the field of hydraulic support technology, specifically to an impact-resistant adjustment system and method for a high-extraction hydraulic support. Background Technology

[0002] In current coal mining practices, high-extraction hydraulic supports are widely used in coal mining processes, and their load-bearing capacity and stability are crucial for ensuring the safety and efficiency of coal production. However, during operation, high-extraction supports are subjected to significant impacts and pressures from intense surrounding rock activity and frequent periodic rock pressure events.

[0003] To mitigate the damage to vertical supports caused by mine impacts, the industry typically installs safety valves at the hydraulic inlet of the supports to release pressure during impacts. However, in the initial stages of a mine impact, the safety valve may not react quickly enough and fail to open immediately, causing the supports to bear excessive pressure in the early stages of the impact. Furthermore, under high-energy impacts, even if the safety valve opens in time, the pressure may continue to rise due to limited flow capacity, failing to effectively alleviate the impact. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, embodiments of the present invention propose an impact-resistant adjustment system and method for hydraulic supports with high mining height.

[0006] The impact-resistant adjustment system of the high-extraction hydraulic support in this invention includes a column, a reversing valve, a pump station, a first accumulator, and a hydraulic support. The hydraulic support includes a column, which includes a cylinder, a first piston, and a first piston rod. The first piston is disposed in the cylinder and is movable along the length of the cylinder. The first piston divides the chamber of the cylinder into a first oil chamber and a second oil chamber. The first piston rod is disposed in the second oil chamber and connected to the first piston. The reversing valve has an inlet, a return port, a first working port, and a second working port. The first working port is connected to the first oil chamber, and the second working port is connected to the second oil chamber. The reversing valve can switch between a first state and a second state. In the first state, the inlet is connected to the first working port, the return port is connected to the second working port, and the first piston rod moves out of the cylinder. In the second state, the inlet is connected to the second working port, the return port is connected to the first working port, and the first piston rod moves into the cylinder. The pumping station has an outlet pipeline and a return pipeline. The outlet pipeline is connected to the inlet, and the return pipeline is connected to the return outlet. The first accumulator is located between the column and the reversing valve. The first accumulator has a first oil inlet and outlet, which are respectively connected to the first oil chamber and the first working port.

[0007] In some embodiments, the hydraulic oil pressure of the pump station is P0, and the pre-charge pressure of the air bladder in the first accumulator is P1, where P1 > P0.

[0008] In some embodiments, the column further includes a second piston and a second piston rod. The first piston rod has a chamber. The second piston is disposed in the chamber of the first piston rod and is movable along the length direction of the first piston rod. The second piston divides the chamber of the first piston rod into a third oil chamber and a fourth oil chamber. The second piston rod is disposed in the fourth oil chamber and connected to the second piston. The third oil chamber communicates with the first oil chamber, and the fourth oil chamber communicates with the second working port.

[0009] In some embodiments, the high-extraction hydraulic support shock-resistant adjustment system includes a hydraulically controlled check valve, which is located between the first accumulator and the reversing valve. The hydraulically controlled check valve has a control port, a first inlet and a second inlet and a third inlet. The control port is connected to at least one of the second oil chamber and the fourth oil chamber. The first inlet and the third inlet are connected to the first working port, and the second inlet and the third inlet are connected to the first oil chamber.

[0010] In some embodiments, the high-extraction hydraulic support shock-resistant adjustment system includes a safety valve, which is connected to the first oil chamber. When the hydraulic oil pressure in the first oil chamber exceeds a preset value, the safety valve opens.

[0011] In some embodiments, the high-extraction hydraulic support shock-resistant adjustment system includes a displacement monitoring device and a pressure sensor. The displacement monitoring device is used to monitor the extension and retraction of the column, and the pressure sensor is used to monitor the hydraulic oil pressure in the first oil chamber.

[0012] In some embodiments, the high-extraction hydraulic support shock-resistant adjustment system includes a second accumulator, the second accumulator having a second oil inlet and outlet, the second oil inlet and outlet being connected to the liquid outlet pipeline.

[0013] In some embodiments, the pre-charge pressure of the air bladder inside the second accumulator is P2, where P2 is less than P0.

[0014] The impact resistance adjustment method for high-extraction hydraulic supports according to embodiments of the present invention, wherein the method is applied to the high-extraction hydraulic support impact resistance adjustment system described in any of the above embodiments, includes: Calculate the impact energy E1 of the mine pressure on the column:

[0015] (1) In the formula, v is the descent speed of the column, r is the inner diameter of the cylinder (101), and P is the hydraulic oil pressure in the first oil chamber; the pre-charge pressure of the air bladder in the first accumulator is defined as P1, and the maximum mine pressure impact pressure is defined as P max The maximum descent of the column is L. max The maximum bearing capacity of the column is P. design ; When P max ≤P design At that time, L is reduced by increasing P1. max ; When P max ≥P design At the same time, by reducing P1, the column is given sufficient time to buffer, thereby reducing the maximum impact of the mine pressure.

[0016] In some embodiments, the maximum energy E2 absorbed by the first accumulator is calculated based on the maximum mine pressure impact, and the calculation formula is as follows:

[0017] (2) In the formula, V1 is the volume of the first accumulator; When E1≤E2, the first accumulator can completely absorb the impact energy of the mine pressure. When E1≥E2, the first accumulator cannot fully absorb the impact energy of the mine pressure. The value of E2 is adjusted by changing P1 and V1 so that E1≤E2.

[0018] The impact-resistant adjustment system and method for high-extraction hydraulic supports of this invention, in the event of a mine pressure impact, transmits the impact force borne by the top plate of the hydraulic support to the column. The impact force on the column is then transmitted to the first piston rod, which in turn transmits the instantaneous pressure to the piston, which in turn transmits the pressure to the hydraulic oil in the first oil chamber. Because the first accumulator, located between the column and the reversing valve, acts as a buffer, it can quickly absorb the instantaneous increase in pressure of the hydraulic oil in the first oil chamber when the hydraulic support is subjected to a mine pressure impact. This allows the system to respond quickly to the mine pressure impact, reducing the pressure borne by the column in the initial stage of the impact. This effectively reduces the damage to the column caused by the mine pressure impact, extends the column's service life, helps maintain the overall stability of the working face during coal mining, and improves the safety and efficiency of coal production. Since the system can more effectively cope with mine pressure impacts, it reduces downtime caused by column damage, thereby lowering production costs. Furthermore, through the action of the first accumulator, the system can provide additional oil during pressure fluctuations or absorb excess oil when subjected to impacts, thereby maintaining pressure stability inside the column and improving the system's buffering and adjustment capabilities. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the impact-resistant adjustment system of the high-extraction hydraulic support according to an embodiment of the present invention.

[0020] Figure label: 100. High-extraction hydraulic support anti-impact adjustment system; 1. Column; 101. Cylinder; 1011. First oil chamber; 1012. Second oil chamber; 102. First piston; 103. First piston rod; 1031. Third oil chamber; 1032. Fourth oil chamber; 104. Second piston; 105. Second piston rod; 2. Reversing valve; 201. Inlet; 202. Return port; 203. First working port; 204. Second working port; 3. Pump station; 301. Outlet pipeline; 302. Return pipeline; 4. First accumulator; 401. First inlet / outlet; 5. Hydraulic check valve; 501. Control port; 502. First inlet / outlet; 503. Second inlet / outlet; 6. Safety valve; 7. Displacement monitoring device; 8. Pressure sensor; 9. Second accumulator; 901. Second inlet / outlet. Detailed Implementation

[0021] 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.

[0022] like Figure 1 As shown, the high-extraction hydraulic support anti-impact adjustment system 100 of this invention includes a column 1, a reversing valve 2, a pump station 3, a first accumulator 4, and a hydraulic support. The hydraulic support includes the column 1. The column 1 includes a cylinder 101, a first piston 102, and a first piston rod 103. The first piston 102 is located inside the cylinder 101 and is movable along the length of the cylinder 101. The first piston 102 divides the chamber of the cylinder 101 into a first oil chamber 1011 and a second oil chamber 1012. The first piston rod 103 is located in the second oil chamber 1012 and is connected to the first piston 102.

[0023] The reversing valve 2 has an inlet port 201, a return port 202, a first working port 203, and a second working port 204. The first working port 203 is connected to the first oil chamber 1011, and the second working port 204 is connected to the second oil chamber 1012. The reversing valve 2 can switch between a first state and a second state. In the first state, the inlet port 201 is connected to the first working port 203, the return port 202 is connected to the second working port 204, and the first piston rod 103 moves outward from the cylinder body 101. In the second state, the inlet port 201 is connected to the second working port 204, the return port 202 is connected to the first working port 203, and the first piston rod 103 moves inward from the cylinder body 101.

[0024] Pump station 3 has an outlet pipe 301 and a return pipe 302. The outlet pipe 301 is connected to the inlet 201, and the return pipe 302 is connected to the return outlet 202.

[0025] The first accumulator 4 is located between the column 1 and the reversing valve 2. The first accumulator 4 has a first oil inlet and outlet port 401, which is connected to the first oil chamber 1011 and the first working port 203, respectively.

[0026] In this embodiment of the invention, the high-extraction hydraulic support impact-resistant adjustment system 100 operates with the switching directional valve 2 in a first state, where the inlet 201 is connected to the first working port 203 and the return port 202 is connected to the second working port 204. Hydraulic oil flowing from the outlet pipe 301 of the pump station 3 sequentially passes through the inlet 201 and the first working port 203 of the switching valve 2 into the first oil chamber 1011. Hydraulic oil in the second oil chamber 1012 sequentially returns through the second working port 204, the return port 202, and the return pipe 302 of the pump station 3, thereby achieving the lifting of the column 1. Conversely, when the switching directional valve 2 is in a second state, the inlet 201 is connected to the second working port 204 and the return port 202 is connected to the first working port 203. Hydraulic oil flowing from the outlet pipe 301 of the pump station 3 sequentially passes through the inlet 201 and the second working port 204 of the switching valve 2 into the second oil chamber 1012. The hydraulic oil in the first oil chamber 1011 returns to the first working port 203, the return port 202 and the return pipeline 302 of the pump station 3 in sequence, thereby realizing the descent of the column 1.

[0027] When a mine pressure impact occurs, the impact force borne by the hydraulic support top plate is transmitted to the column 1. The impact force on the column 1 is then transmitted to the first piston rod 103, which in turn transmits the instantaneous pressure to the piston. The piston then transmits the pressure to the hydraulic oil in the first oil chamber 1011. Since the first accumulator 4, located between the column 1 and the reversing valve 2, acts as a buffer, it can quickly absorb the instantaneous increase in pressure of the hydraulic oil in the first oil chamber 1011 when the hydraulic support is subjected to a mine pressure impact. This allows the system to respond quickly to the mine pressure impact, reducing the pressure borne by the column 1 in the initial stage of the impact. This effectively reduces the damage to the column 1 caused by the mine pressure impact, extends its service life, helps maintain the overall stability of the working face during coal mining, and improves the safety and efficiency of coal production. Because the system can more effectively cope with mine pressure impacts, it reduces downtime caused by damage to the column 1, thereby lowering production costs. Furthermore, through the action of the first accumulator 4, the system can provide additional oil during pressure fluctuations or absorb excess oil when subjected to impacts, thus maintaining the internal pressure stability of the column 1 and improving the system's buffering and regulating capabilities.

[0028] In some embodiments, the hydraulic oil pressure of the pump station 3 is P0, and the pre-charge pressure of the air bladder in the first accumulator 4 is P1, where P1 > P0. For example, P0 is generally equal to 31.5 MPa or 37.5 MPa, and P1 can be set to other values ​​greater than P0, such as 40 MPa.

[0029] Because P1 is greater than P0, the air bladder in the first accumulator 4 is in a pre-charged state during normal system operation, meaning the air bladder has been compressed to a certain extent. Since P1 is greater than P0, the hydraulic oil pressure in the system will not compress the air bladder in the first accumulator 4 during normal operation. In other words, only when subjected to mine pressure impact will the hydraulic oil pressure in the first oil chamber 1011 increase instantaneously beyond P1, causing the first accumulator 4 to be compressed and absorb energy. This avoids repeated compression of the air bladder in the first accumulator 4 during normal operation; energy absorption is only achieved when a mine pressure impact occurs, thus helping to extend the service life of the first accumulator 4.

[0030] In some embodiments, the column 1 further includes a second piston 104 and a second piston rod 105. The first piston rod 103 has a chamber. The second piston 104 is disposed in the chamber of the first piston rod 103 and is movable along the length direction of the first piston rod 103. The second piston 104 divides the chamber of the first piston rod 103 into a third oil chamber 1031 and a fourth oil chamber 1032. The second piston rod 105 is disposed in the fourth oil chamber 1032 and connected to the second piston 104. The third oil chamber 1031 communicates with the first oil chamber 1011, and the fourth oil chamber 1032 communicates with the second working port 204.

[0031] Specifically, such as Figure 1As shown, in the embodiment of the present invention, when the high-extraction hydraulic support anti-impact adjustment system 100 is working, the switching directional valve 2 is in the first state, with the inlet 201 connected to the first working port 203 and the return port 202 connected to the second working port 204. The hydraulic oil flowing from the outlet pipe 301 of the pump station 3 sequentially passes through the inlet 201 and the first working port 203 of the switching valve 2 into the first oil chamber 1011, and then through the first oil chamber 1011 into the third oil chamber 1031. The hydraulic oil in the second oil chamber 1012 and the fourth oil chamber 1032 sequentially returns through the second working port 204, the return port 202, and the return pipe 302 of the pump station 3, thereby raising the first piston rod 103 and the second piston rod 104. Conversely, when the switching directional valve 2 is in the second state, the inlet 201 is connected to the second working port 204 and the return port 202 is connected to the first working port 203. The hydraulic oil flowing out of the outlet pipe 301 of pump station 3 passes sequentially through the inlet 201 and the second working port 204 of the reversing valve 2 into the second oil chamber 1012 and the fourth oil chamber 1032. The hydraulic oil in the first oil chamber 1011 and the third oil chamber 1031 returns sequentially through the first working port 203, the return port 202 and the return pipe 302 of pump station 3, thereby realizing the descent of the first piston rod 103 and the second piston rod 104.

[0032] By setting up multi-stage piston rods, it is beneficial to increase the support height of the hydraulic support, which can adapt to roadways of different heights and improve the versatility of the equipment.

[0033] In some embodiments, the high-extraction hydraulic support anti-impact adjustment system 100 of the present invention includes a hydraulically controlled check valve 5, which is disposed between a first accumulator 4 and a reversing valve 2. The hydraulically controlled check valve 5 has a control port 501, a first inlet / outlet 502, and a second inlet / outlet 503. The control port 501 is connected to at least one of a second oil chamber 1012 and a fourth oil chamber 1032. The first inlet / outlet 502 is connected to a first working port 203, and the second inlet / outlet 503 is connected to the first oil chamber 1011.

[0034] Specifically, when the column 1 rises, the hydraulic control check valve 5 allows unidirectional flow of hydraulic oil, that is, hydraulic oil flows in from the first inlet / outlet 502 and flows to the first oil chamber 1011 through the second inlet / outlet 503. When the column 1 falls, the hydraulic oil in the second oil chamber 1012 and the fourth oil chamber 1032 enters the control port 501 of the hydraulic control check valve 5. The hydraulic oil entering the control port 501 controls the internal structure of the hydraulic control check valve 5 to change, so that the hydraulic control check valve 5 can achieve reverse flow, that is, hydraulic oil flows in through the second inlet / outlet 503 and flows out through the first inlet / outlet 502.

[0035] The hydraulically controlled check valve 5 can respond quickly to pressure changes, improving the system's reaction speed. During mine pressure shocks, the hydraulically controlled check valve 5 prevents oil from flowing backwards due to pressure fluctuations, protecting the column 1 from damage. The hydraulically controlled check valve 5 can adjust the oil flow direction based on the pressure signal from the control port 501, facilitating more precise control of the pressure and position of the column 1. By controlling the oil flow direction, the hydraulically controlled check valve 5 helps maintain the system's stability and reliability. The hydraulically controlled check valve 5 works in conjunction with other components such as the first accumulator 4 and the reversing valve 2 to form a complex shock-resistant regulation system. In this system, the hydraulically controlled check valve 5 not only prevents oil backflow but also allows the accumulator to rapidly release energy when needed to mitigate mine pressure shocks.

[0036] In some embodiments, the high-extraction hydraulic support anti-impact adjustment system 100 of the present invention includes a safety valve 6, which is connected to a first oil chamber 1011. When the hydraulic oil pressure in the first oil chamber 1011 exceeds a preset value, the safety valve 6 opens.

[0037] Safety valve 6 is typically set with an opening pressure threshold. When the pressure in the first oil chamber 1011 exceeds this threshold, safety valve 6 will automatically open, releasing some oil to reduce the pressure within the system. The opening and closing of safety valve 6 is automatic and does not require an external control signal.

[0038] Safety valve 6 provides an overpressure protection mechanism. When the system pressure exceeds the designed safe range, safety valve 6 automatically opens to prevent system damage due to overpressure. By releasing excess pressure, safety valve 6 helps maintain system stability and avoids damage to column 1 caused by pressure fluctuations. The timely response of safety valve 6 reduces fatigue damage to column 1 and other system components, thereby extending the service life of the equipment. Safety valve 6 provides a safety barrier for the system, reducing potential safety accidents caused by pressure runaway. Safety valve 6 works together with other components such as the first accumulator 4, hydraulic check valve 5, and directional valve 2 to form a comprehensive shock-resistant regulation system. In the event of mine pressure shock or system abnormalities, safety valve 6 can coordinate with other components to quickly respond to and adjust the system pressure, ensuring safe system operation. The preset opening pressure value of safety valve 6 needs to be set according to the design strength of column 1, operating conditions, and actual system requirements. The preset value should ensure that safety valve 6 does not open frequently under normal operating conditions, but can open promptly to protect the system under abnormal conditions.

[0039] In some embodiments, the high-extraction hydraulic support anti-impact adjustment system 100 of the present invention includes a displacement monitoring device 7 and a pressure sensor 8. The displacement monitoring device 7 is used to monitor the extension and retraction of the column 1, and the pressure sensor 8 is used to monitor the hydraulic oil pressure in the first oil chamber 1011.

[0040] The displacement monitoring device 7 is used to monitor the expansion and contraction of the column 1 in real time, that is, the extension and retraction length of the column 1. This device can be mechanical (such as a gear ruler, encoder, etc.) or electronic (such as a linear variable differential transformer (LVDT), laser sensor, etc.). By monitoring the expansion and contraction of the column 1, the system can control the position of the column 1 to ensure that it provides the necessary support force in the correct position.

[0041] Pressure sensor 8 is used to monitor the hydraulic oil pressure in the first oil chamber 1011, and this pressure data is crucial for system control. Pressure sensor 8 can be analog or digital, and can convert pressure values ​​into electrical signal outputs. Based on the data from pressure sensor 8, the system can adjust the oil supply pressure of pump station 3, the pre-charge pressure P1 of the air bladder in the first accumulator 4, and the opening of safety valve 6 in real time.

[0042] The data provided by the displacement monitoring device 7 and the pressure sensor 8 can be used in the closed-loop control system, enabling the system to automatically adjust the working state of the column 1. When abnormal extension or contraction of the column 1 or abnormal pressure in the first oil chamber 1011 is detected, the system can make immediate adjustments to protect the column 1 and ensure the stable operation of the system.

[0043] The use of displacement monitoring device 7 and pressure sensor 8 improves the system's monitoring accuracy of the position and pressure of column 1, facilitating more precise control. Through real-time monitoring, the system can react promptly before potential problems occur, reducing safety risks. The system can optimize the working performance of column 1 based on the monitored data, improving the efficiency and safety of coal mining. The data from the monitoring devices and sensors provides maintenance personnel with detailed information on the status of column 1 and the system, facilitating timely maintenance and troubleshooting. The data collected by displacement monitoring device 7 and pressure sensor 8 needs to be transmitted to the control system for processing. The control system can execute corresponding control strategies based on this data, such as adjusting the working pressure of pump station 3, controlling the pre-charge pressure P1 of the air bladder in the first accumulator 4, and controlling the opening and closing of safety valve 6.

[0044] In some embodiments, the high-extraction hydraulic support shock-resistant adjustment system 100 includes a second accumulator 9, which has a second inlet / outlet port 901 connected to an outlet pipe 301. For example, during the lifting and lowering of the hydraulic support column, the second accumulator 9 can supply high-pressure emulsion to the outlet pipe 301 through the outlet pipe 301 to accelerate the lifting and lowering speed of the column 1 and improve the dynamic response capability of the system.

[0045] In some embodiments, the pre-charge pressure of the air bladder inside the second accumulator 9 is P2, where P2 is less than P0.

[0046] The design, where P2 is less than P0, ensures that the second accumulator 9 can store oil under normal operating conditions. When the system pressure drops, the bladder inside the second accumulator 9 expands, releasing oil to replenish the system pressure. The second accumulator 9 can respond quickly to pressure changes, replenishing system pressure in a timely manner and improving the system's dynamic response capability.

[0047] The impact resistance adjustment method for high-extraction hydraulic supports according to embodiments of the present invention, wherein the method is applied to the impact resistance adjustment system for high-extraction hydraulic supports in any of the above embodiments, includes: Calculate the impact energy E1 of the mine pressure on column 1:

[0048] (1) In the formula, v is the descent speed of column 1, r is the inner diameter of cylinder 101, and P is the hydraulic oil pressure in the first oil chamber 1011; the pre-charge pressure of the air bladder in the first accumulator 4 is defined as P1, and the maximum mine pressure impact pressure is P max The maximum descent of column 1 is L. max The maximum bearing capacity of column 1 is P. design ; When P max ≤P design At that time, L is reduced by increasing P1. max ; When P max ≥P design At the same time, by reducing P1, sufficient time buffer is ensured for column 1 to reduce the maximum impact of mine pressure.

[0049] By adjusting the pre-charge pressure P1 of the first accumulator 4, the system can effectively control the descent of the column 1 and the system pressure under different intensities of mine pressure impact, protecting the column 1 from damage. This adjustment method helps improve the system's adaptability and shock resistance, ensuring the safety and efficiency of coal production.

[0050] In some embodiments, the maximum energy E2 absorbed by the first accumulator 4 is calculated based on the maximum mine pressure impact, and the calculation formula is as follows:

[0051] (2) In the formula, V1 is the volume of the first accumulator 4; When E1≤E2, the first accumulator 4 can completely absorb the impact energy of the mine pressure. When E1≥E2, the first accumulator 4 cannot completely absorb the impact energy of the mine pressure. The value of E2 is adjusted by changing P1 and V1 so that E1≤E2.

[0052] By calculating and adjusting the value of E2, the system can ensure that the first accumulator 4 can effectively absorb the impact energy when mine pressure shock occurs, protecting the column 1 from damage. This adjustment method helps improve the system's adaptability and shock resistance, ensuring the safety and efficiency of coal production.

[0053] Optionally, such as Figure 1 As shown, there are two columns 1, arranged at intervals. When two double telescopic columns 1 are installed, the calculation of the mine pressure impact energy E1 of the column 1 and the maximum energy E2 absorbed by the first accumulator 4 should be calculated as twice that of a single column 1.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A shock-resistant adjustment system for a high-extraction hydraulic support, characterized in that, include: A hydraulic support includes a column (1), the column (1) includes a cylinder (101), a first piston (102) and a first piston rod (103), the first piston (102) is disposed in the cylinder (101) and is movable along the length of the cylinder (101), the first piston (102) divides the chamber of the cylinder (101) into a first oil chamber (1011) and a second oil chamber (1012), and the first piston rod (103) is disposed in the second oil chamber (1012) and connected to the first piston (102); A reversing valve (2) has an inlet (201), a return port (202), a first working port (203), and a second working port (204). The first working port (203) is connected to the first oil chamber (1011), and the second working port (204) is connected to the second oil chamber (1012). The reversing valve (2) can switch between a first state and a second state. In the first state, the inlet (201) is connected to the first working port (203), the return port (202) is connected to the second working port (204), and the first piston rod (103) moves outward from the cylinder (101). In the second state, the inlet (201) is connected to the second working port (204), the return port (202) is connected to the first working port (203), and the first piston rod (103) moves inward from the cylinder (101). Pump station (3), the pump station (3) has an outlet pipe (301) and a return pipe (302), the outlet pipe (301) is connected to the inlet (201), and the return pipe (302) is connected to the return outlet (202); The first accumulator (4) is located between the column (1) and the reversing valve (2). The first accumulator (4) has a first oil inlet and outlet (401), which is connected to the first oil chamber (1011) and the first working port (203) respectively.

2. The high-extraction hydraulic support impact-resistant adjustment system according to claim 1, characterized in that, The hydraulic oil pressure of the pump station (3) is P0, and the pre-charge pressure of the air bladder in the first accumulator (4) is P1, where P1 > P0.

3. The impact-resistant adjustment system for a high-extraction hydraulic support according to claim 2, characterized in that, The column (1) further includes a second piston (104) and a second piston rod (105). The first piston rod (103) has a chamber. The second piston (104) is disposed in the chamber of the first piston rod (103) and is movable along the length direction of the first piston rod (103). The second piston (104) divides the chamber of the first piston rod (103) into a third oil chamber (1031) and a fourth oil chamber (1032). The second piston rod (105) is disposed in the fourth oil chamber (1032) and connected to the second piston (104). The third oil chamber (1031) is connected to the first oil chamber (1011), and the fourth oil chamber (1032) is connected to the second working port (204).

4. The high-extraction hydraulic support impact-resistant adjustment system according to claim 3, characterized in that, The high-extraction hydraulic support anti-impact adjustment system includes a hydraulically controlled check valve (5), which is located between the first accumulator (4) and the reversing valve (2). The hydraulically controlled check valve (5) has a control port (501), a first inlet / outlet (502), and a second inlet / outlet (503). The control port (501) is connected to at least one of the second oil chamber (1012) and the fourth oil chamber (1032). The first inlet / outlet (502) is connected to the first working port (203), and the second inlet / outlet (503) is connected to the first oil chamber (1011).

5. The high-extraction hydraulic support impact-resistant adjustment system according to claim 1, characterized in that, The high-extraction hydraulic support anti-impact adjustment system includes a safety valve (6), which is connected to the first oil chamber (1011). When the hydraulic oil pressure in the first oil chamber (1011) exceeds a preset value, the safety valve (6) opens.

6. The high-extraction hydraulic support impact-resistant adjustment system according to claim 1, characterized in that, The high-extraction hydraulic support impact-resistant adjustment system includes a displacement monitoring device (7) and a pressure sensor (8). The displacement monitoring device (7) is used to monitor the extension and retraction of the column (1), and the pressure sensor (8) is used to monitor the hydraulic oil pressure in the first oil chamber (1011).

7. The impact-resistant adjustment system for a high-extraction hydraulic support according to claim 1, characterized in that, The high-extraction hydraulic support anti-impact adjustment system includes a second accumulator (9), which has a second inlet and outlet (901) and is connected to the outlet pipeline (301).

8. The high-extraction hydraulic support impact-resistant adjustment system according to claim 7, characterized in that, The pre-charge pressure of the air bladder inside the second accumulator (9) is P2, where P2 is less than P0.

9. A method for adjusting the impact resistance of a high-extraction hydraulic support, wherein the method is applied to the high-extraction hydraulic support impact resistance adjustment system according to any one of claims 1-8, characterized in that, include: Calculate the impact energy E1 of the rock pressure on the column (1): (1) In the formula, v is the descent speed of the column (1), r is the inner diameter of the cylinder (101), and P is the hydraulic oil pressure in the first oil chamber (1011); the pre-charge pressure of the air bladder in the first accumulator (4) is defined as P1, and the maximum mine pressure impact pressure is P max The maximum descent of the column (1) is L. max The maximum bearing capacity of the column (1) is P. design ; When P max ≤P design At that time, L is reduced by increasing P1. max ; When P max ≥P design At that time, by reducing P1, the column (1) is guaranteed to have enough time to buffer, thereby reducing the maximum impact of the mine pressure.

10. The method for adjusting the impact resistance of a high-extraction hydraulic support according to claim 9, characterized in that, The maximum energy E2 absorbed by the first accumulator (4) is calculated based on the maximum mine pressure impact. The calculation formula is as follows: (2) In the formula, V1 is the volume of the first accumulator (4); When E1≤E2, the first accumulator (4) can completely absorb the impact energy of the mine pressure; When E1≥E2, the first accumulator (4) cannot fully absorb the impact energy of the mine pressure. The value of E2 is adjusted by changing P1 and V1 so that E1≤E2.

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