High-stability combined hydraulic supporting device and hydraulic system thereof

Abstract

The invention relates to a high-stability combined type hydraulic supporting device which comprises a base, a top beam and a bottom hydraulic column arranged between the base and the top beam, an upper inlet and a lower inlet are formed in the side wall of the bottom hydraulic column, the lower inlet is connected with a pressure relief assembly, the upper inlet is connected with a control valve, and the pressure relief assembly is connected with the control valve. The pressure relief assembly comprises a shell and a blocking plug, an inner cavity is formed in the shell, the blocking plug is matched in the inner cavity, a main inlet is formed in one end of the shell, a main outlet is formed in the other end of the shell, a pressure relief opening is formed in the side wall of the shell, and an elastic piece is arranged in the inner cavity and used for pushing the blocking plug to separate the main outlet from the pressure relief opening. And when the bottom hydraulic column relieves pressure, the blocking plug extrudes the elastic piece under the pressure of hydraulic oil, so that the main outlet communicates with the pressure relief opening after the blocking plug moves, and a liquid flow channel is formed in the center of the blocking plug. The bottom hydraulic column has the advantages that the stability of the bottom hydraulic column in the using process is improved, and damage caused when the bottom hydraulic column is impacted is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of a hydraulic support device, and in particular to a highly stable combined hydraulic support device and a hydraulic system thereof. Background Art

[0002] The hydraulic support device is used in the coal mining process. The hydraulic system is used in the hydraulic support device to provide support force and power for the self-movement of the hydraulic support device. The hydraulic support device is a mechanical device used to control the mine pressure of the coal mining working face and provide the coal mining working face. During the coal mining process, as the working face advances, the hydraulic support device also moves.

[0003] The prior art patent document CN220979552U discloses a coal mine integral roof beam combined hydraulic support, including a base, a hydraulic support, a roof beam and a shielding beam, the base is hingedly connected to the bottom end of the hydraulic support, the top end of the telescopic shaft of the hydraulic support is hingedly installed on the roof beam, and the rear end of the roof beam is hingedly installed with a shielding beam; it also includes a quick support device, the shielding beam and the base are hingedly matched through a connecting rod, and a quick support device is arranged on the side of the base, the quick support device includes a support beam, a hoop, a connecting rod and a length adjustment mechanism, a support beam is arranged on the side of the base, the top end of the support beam is hingedly matched with the hoop, the hoop is sleeved and fixed on the telescopic shaft surface of the hydraulic support, a connecting rod is hingedly installed on the side of the base, the end of the connecting rod is hingedly matched with the middle section of the support beam, and a length adjustment mechanism is arranged on the support beam.

[0004] The prior art patent document CN217176674U discloses a combined hydraulic support, comprising a base, a fixing part, a lower connecting rod, an upper connecting rod, a top beam, a front beam, a guard plate and a supporting assembly, wherein a bottom hydraulic column is symmetrically fixedly installed on the top of one end of the base, a fixing part is fixedly installed on one side of the top of the base, a lower connecting rod is movably installed on the top of the fixing part through an axle rod, an upper connecting rod is movably installed on one end of the lower connection through the axle rod, one end of the top beam rotates with the upper connecting rod, and the other end rotates with the front beam, one end of the front beam is rotatably connected to the guard plate, a top hydraulic rod is fixedly installed between the top beam and the front beam, and between the front beam and the guard plate, the supporting assembly comprises a connecting rod, a rotating rod, a screw, a sliding rod and a limiting slide plate, the limiting slide plate is slidably installed in the limiting slide groove, the sliding rod limit lifting and sliding is installed inside the limiting slide plate, a screw is fixedly installed on the bottom of the rotating rod, the screw is movably installed inside the sliding rod through a thread, a connecting rod is movably installed on the top of the rotating rod through a rotating shaft, and the connecting rod is movably installed on one side of the lower connecting rod through a rotating shaft. The support assembly can move with the rotation of the lower connecting rod, and the support of the lower connecting rod is increased by rotating the rod and the screw rod to improve the stability.

[0005] A plurality of bottom hydraulic columns are usually used for support between the top beam and the base. When the top beam is impacted, the bottom hydraulic columns bear the impact, so that the bottom hydraulic columns are easily damaged after being in the extended state. Summary of the invention

[0006] In order to improve the stability of the bottom hydraulic column during use and reduce damage to the bottom hydraulic column when it is impacted, the present application provides a highly stable combined hydraulic support device and a hydraulic system thereof.

[0007] The present application provides a highly stable combined hydraulic support device, which adopts the following technical solution:

[0008] A highly stable combined hydraulic support device comprises a base, a top beam and a bottom hydraulic column arranged between the base and the top beam, an upper inlet and a lower inlet are arranged on the side wall of the bottom hydraulic column, a pressure relief assembly is connected to the lower inlet, the upper inlet is connected to a control valve, the pressure relief assembly is connected to the control valve, the pressure relief assembly comprises a shell and a blocking plug, the interior of the shell is an inner cavity, the blocking plug is fitted in the inner cavity, a main inlet is arranged at one end of the shell, a main outlet is arranged at the other end, a pressure relief port is provided on the side wall of the shell, an elastic member is provided in the inner cavity, the elastic member is used to push the blocking plug to separate the main outlet and the pressure relief port, and when the bottom hydraulic column is relieving pressure, the blocking plug is subjected to the pressure of the hydraulic oil to squeeze the elastic member, so that the main outlet is connected to the pressure relief port after the blocking plug moves, and a liquid flow channel is provided in the center of the blocking plug.

[0009] When the above technical scheme is adopted, a bottom hydraulic column is arranged between the top beam and the base as a support during use, and the lower inlet of the bottom hydraulic column is connected to the pressure relief assembly. When the bottom hydraulic column is providing support, the interior of the bottom hydraulic column is subjected to a large pressure, and the internal pressure oil will directly act on the position of the main outlet of the shell from the lower inlet. The blocking plug is used to separate the main outlet from the pressure relief port. When the pressure at the main outlet suddenly increases, the blocking plug will be subjected to a large force and move, so that the pressure relief port is connected to the main outlet, thereby releasing a small part of the pressure oil in the bottom hydraulic column, and then returning to the state of separating the main outlet from the pressure relief port under the action of the elastic member, and promptly restoring the supporting state of the bottom hydraulic column, thereby enabling the bottom hydraulic column to buffer the impact, so as to reduce the damage to the bottom hydraulic column when it is impacted, and improve the safety and stability of the bottom hydraulic column during use.

[0010] Preferably, an inner baffle is provided inside the inner cavity, and the two sides of the inner baffle are an upper cavity and a lower cavity respectively, the blocking plug is in the lower cavity, a control plug is provided in the upper cavity, and an elastic member is also provided between the control plug and the inner baffle, the control plug comprises an upper cylindrical portion and a lower cylindrical portion, the diameter of the lower cylindrical portion is greater than the diameter of the upper cylindrical portion, and the lower cylindrical portion cooperates with the upper cavity, a top cavity is also provided in the shell body, the top cavity is connected with the main inlet, the upper cylindrical portion cooperates in the top cavity, a main oil channel is opened in the control plug, one end of the main oil channel is at the connection between the upper cylindrical portion and the lower cylindrical portion, and the other end is at the end face of the lower cylindrical portion away from the upper cylindrical portion.

[0011] Preferably, a cylinder body 1 is provided on a side of the control plug facing the blocking plug, and a cylinder body 2 is provided on a side of the blocking plug facing the control plug. One end of the cylinder body 2 is fitted in the cylinder body 1, and a filter is provided in the cylinder body 2.

[0012] Preferably, a slag discharge port is provided on the shell, a hand valve is installed on the slag discharge port, and one end of the slag discharge port away from the hand valve is used to be connected to the connection between the upper cavity and the top cavity.

[0013] Preferably, the blocking plug is provided with a cylindrical head at one end away from the second cylinder, and the diameter of the cylindrical head is larger than the diameter of the second cylinder.

[0014] Preferably, the blocking plug is connected to one side of the cylindrical head and the inner cavity of the shell to form an open cavity, and the open cavity is connected to an opening port, and the opening port is used to simultaneously introduce hydraulic oil into the open cavity when the hydraulic oil enters the upper inlet, and a radial channel is opened on the blocking plug, one end of the radial channel is used to connect to the liquid flow channel, and the other end is on the side wall of the blocking plug.

[0015] Preferably, the control valve is a two-position five-way reversing valve, which has a P port, a T port, and a A port, a B port, and a C port. The P port is connected to the pump, the T port is connected to the oil tank, and the B port and the C port are connected. When the control valve controls the extension of the bottom hydraulic column, the P port is connected to the A port, and the B port is connected to the T port; when the control valve contracts the bottom hydraulic column, the P port is connected to the B port, and the T port and the A port are both in a closed state, the A port is connected to the main inlet, the B port is connected to the upper inlet, the C port is connected to the opening port, and the T port is also connected to the pressure relief port.

[0016] Preferably, one end of the hand valve away from the slag discharge port is connected to the T port.

[0017] The present application also provides a hydraulic system of a highly stable combined hydraulic support device, which adopts the following technical solution:

[0018] A hydraulic system of a high-stability combined hydraulic support device controls a bottom hydraulic column by adopting the above-mentioned high-stability combined hydraulic support device.

[0019] In summary, the present application includes at least one of the following beneficial technical effects:

[0020] 1. When the bottom hydraulic column is impacted, the lower inlet of the bottom hydraulic column is connected to the main outlet of the shell, so that the pressure at the main outlet increases, and then the pressure at the main outlet exerts a force on the blocking plug, so that the blocking plug moves in the inner cavity, so that the main outlet is connected to the pressure relief port, so that the impact on the bottom hydraulic column can be buffered by the pressure relief port to reduce damage, thereby improving the stability of the bottom hydraulic column during use;

[0021] 2. The control plug is arranged in the upper chamber. When the hydraulic oil enters from the main inlet, the control plug moves so that the main inlet is connected to the main outlet through the top chamber and the main oil channel. When the position of the bottom hydraulic column is maintained, the control plug disconnects the main inlet from the main oil channel, thereby reducing the impact transmitted to the control valve by the bottom hydraulic column. Since the upper cylindrical part on the control plug cooperates with the top chamber, the control plug automatically opens when the hydraulic oil enters the main inlet, and the lower cylindrical part can further bear the force of resisting the elastic member after the control plug is in the open state, so that the control plug can be further kept open in the state of hydraulic oil, that is, the control plug can be in the open state when it is relatively stable after opening, and the hydraulic oil can stably flow into the bottom hydraulic column, and the hydraulic oil is decompressed through the main oil channel to ensure that the bottom hydraulic column is smoothly extended;

[0022] 3. Cylinder one is arranged on the control plug, and cylinder two is arranged on the blocking plug. Cylinder one and cylinder two can form a sealed space without affecting the movement of cylinder one and cylinder two. The filter in cylinder two filters the hydraulic oil that passes through cylinder one and cylinder two and enters into the bottom hydraulic column, thereby reducing the bottom hydraulic column from being subjected to a large pressure under the support. If there are impurities in the hydraulic oil, the impurities may affect the bottom hydraulic column and easily reduce the service life of the bottom hydraulic column. The filter is located in the space between cylinder one and cylinder two so that the filter can be closer to the bottom hydraulic column to reduce the impurities in the pipeline from entering into the bottom hydraulic column.

[0023] 4. A slag discharge port is provided on the shell. When the impurities in the filter need to be cleaned regularly, the hand valve can be opened when the bottom hydraulic column needs to be contracted. Since the hand valve connects the slag discharge port to the main oil channel, the hydraulic oil that flows back from the main oil channel due to the contraction of the bottom hydraulic column will pass through the filter, thereby flushing the filter to reduce the replacement of the filter.

[0024] 5. The opening port is connected to the opening cavity. When the bottom hydraulic column needs to be retracted, the pressure oil is first introduced into the opening cavity through the opening port, so that the blocking plug connects the radial channel with the pressure relief port, and the hydraulic oil in the lower part of the bottom hydraulic column is discharged through the pressure relief port. The opening order of the opening port and the slag discharge port for oil discharge is that when the slag discharge port is opened, the opening port cannot be opened even if the pressure oil enters, because the hydraulic oil passing through the filter flows out directly, and the opening port must first pass a large pressure to move the elastic part against the blocking plug when opening, so that when the slag discharge port is opened, the hydraulic oil can only flow out through the filter, and will not flow out directly from the opening port, and the filter cannot be backwashed.

[0025] 6. When the control valve is controlling the extension of the bottom hydraulic column, the P port is connected to the A port, and the B port is connected to the T port. Since the P port is connected to the A port, the hydraulic oil entering the P port can flow out from the A port. The A port is connected to the main inlet, so that the hydraulic oil enters the housing. The control plug is opened to allow the main oil channel to flow oil, and then the hydraulic oil enters the bottom hydraulic column along the liquid flow channel. The hydraulic oil in the upper part of the bottom hydraulic column can enter the position of the T port from the B port connected to the upper inlet, so that it can flow back to the oil tank to achieve the extension of the bottom hydraulic column. On the contrary, When the control valve contracts the bottom hydraulic column, port P is connected to port B, port T and port A are both in a closed state, and the hydraulic oil in port P flows out directly from port B and port C, and port C is directly connected to the open port, so that the pressure relief port separated by the blocking plug can be connected to the main outlet first, so that the hydraulic oil in the lower part of the bottom hydraulic column can be directly discharged from the pressure relief port, and the hydraulic oil at port B can flow into the bottom hydraulic column from the upper inlet, and then can push the bottom hydraulic column downward to contract, so that the control valve can accurately control the extension and retraction of the bottom hydraulic column after switching its position. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0027] Figure 2 It is a structural schematic diagram of the bottom hydraulic column in the embodiment of the present application;

[0028] Figure 3 is a schematic structural diagram of a pressure relief assembly in an embodiment of the present application;

[0029] Figure 4 It is a schematic diagram of the connection structure of the control valve in the embodiment of the present application.

[0030] Description of reference numerals: 1. base; 11. upper connecting rod; 12. lower connecting rod; 13. top beam; 14. bottom hydraulic column; 141. lower inlet; 142. upper inlet; 2. pressure relief assembly; 21. shell; 211. main inlet; 212. main outlet; 213. slag discharge port; 214. pressure relief port; 215. opening port; 22. blocking plug; 221. liquid flow channel; 222. cylindrical head; 23. inner cavity; 231. upper cavity; 232. lower cavity; 24 , top cavity; 25, opening cavity; 31, first sealing ring; 32, second sealing ring; 33, third sealing ring; 34, fourth sealing ring; 35, fifth sealing ring; 4, elastic member; 5, inner stop edge; 51, guide hole; 6, control plug; 61, upper cylindrical portion; 62, lower cylindrical portion; 63, annular groove; 64, main oil channel; 65, step surface; 71, cylinder body one; 72, cylinder body two; 73, filter; 8, hand valve; 9, radial channel; 10, control valve. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-4 This application is described in further detail.

[0032] The present application discloses a highly stable combined hydraulic support device, referring to Figure 1 , including a base 1, an upper connecting rod 11, a lower connecting rod 12, a top beam 13 and four bottom hydraulic columns 14. The base 1 is arranged horizontally, the top beam 13 is located directly above the base 1 and is parallel to the base 1. The top beam 13 is used to support the top of the tunnel. One end of the upper connecting rod 11 is connected to one end of the top beam 13, and the other end is rotatably connected to one end of the lower connecting rod 12. The four bottom hydraulic columns 14 are arranged on the base 1 in a rectangular shape. The four bottom hydraulic columns 14 are connected to the base 1 by ball hinges, and the upper ends of the four bottom hydraulic columns 14 are hinged to the top beam 13 by rotating shafts. The top beam 13 can be raised and lowered by the extension of the four bottom hydraulic columns 14, so that the top beam 13 can be supported or released. The four bottom hydraulic columns 14 all use double-section hydraulic cylinders.

[0033] refer to Figure 2 A lower inlet 141 and an upper inlet 142 are provided on the side wall of the bottom hydraulic column 14. The lower inlet 141 is used to extend the bottom hydraulic column 14 when the hydraulic oil enters, and the upper inlet 142 is used to contract the bottom hydraulic column 14 when the hydraulic oil enters. After the bottom hydraulic column 14 is extended, the top beam 13 can be abutted against the top of the tunnel to support the tunnel. Since the bottom hydraulic column 14 needs to bear a larger supporting force, the pressure of the hydraulic oil entering from the lower inlet 141 is greater and the bottom hydraulic column 14 is required to have a higher airtightness to make the supporting capacity of the bottom hydraulic column 14 higher.

[0034] refer to Figure 2 and Figure 3A pressure relief assembly 2 is provided on one side of the bottom hydraulic column 14. The pressure relief assembly 2 includes a housing 21 and a blocking plug 22. The housing 21 is cylindrical and can be fixed on the side wall of the bottom hydraulic column 14. The center line of the housing 21 is parallel to the center line of the bottom hydraulic column 14. A main inlet 211 is provided at the upper end of the housing 21, and a main outlet 212 is provided at the lower end of the housing 21. The main inlet 211 is used to enter the housing 21 with hydraulic oil, and the main outlet 212 is used to flow hydraulic oil out of the housing 21. The interior of the housing 21 is a hollow structure to form an inner cavity 23, and the blocking plug 22 is in the inner cavity 23. A first sealing ring 31 is also provided on the cylindrical outer wall of the blocking plug 22, and the blocking plug 22 is sealed and matched with the inner cavity 23 through the first sealing ring 31, and the blocking plug 22 can be slidably connected inside the inner cavity 23. The blocking plug 22 is located at a position of the housing 21 close to the main outlet 212, and a liquid flow channel 221 is provided at the center of the blocking plug 22, and the liquid flow channel 221 is used to pass hydraulic oil. An elastic member 4 is also provided in the housing 21, and the elastic member 4 adopts a spiral spring, and the axis of the elastic member 4 coincides with the axis of the blocking plug 22, and the force of the elastic member 4 is used to drive the blocking plug 22 to move to one end of the housing 21 close to the main outlet 212, and a pressure relief port 214 is provided on the side wall of the housing 21 close to the main outlet 212. When the blocking plug 22 moves to abut against the lower bottom surface of the inner cavity 23 through the elastic member 4, the blocking plug 22 separates the pressure relief port 214 from the main outlet 212. When pressure relief is required, for example, when the bottom hydraulic column 14 is subjected to a large impact force and pressure relief is necessary to protect the bottom hydraulic column 14, the main outlet 212 is connected to the lower inlet 141. At this time, the pressure inside the bottom hydraulic column 14 increases, causing the pressure at the main outlet 212 to also increase. The blocking plug 22 will move upward under the action of the oil pressure, causing the pressure relief port 214 to be connected to the main outlet 212, so that the hydraulic oil at the main outlet 212 can flow out from the pressure relief port 214 to cushion the impact on the bottom hydraulic column 14.

[0035] An inner stop 5 is arranged in the housing 21, and a circular guide hole 51 is formed in the middle of the inner stop 5. The inner stop 5 divides the inner cavity 23 into an upper cavity 231 and a lower cavity 232, and the stop plug 22 is in the lower cavity 232. A control plug 6 is arranged in the upper cavity 231, and the control plug 6 includes an upper cylindrical portion 61 and a lower cylindrical portion 62 which are arranged integrally. An annular groove 63 is provided on the side walls of the upper cylindrical portion 61 and the lower cylindrical portion 62. A second sealing ring 32 is arranged in the annular groove 63 of the upper cylinder, and a third sealing ring 33 is arranged in the annular groove 63 of the side wall of the lower cylindrical portion 62. The third sealing ring 33 cooperates with the inner wall of the upper cavity 231 to seal. The diameter of the upper cylindrical portion 61 is smaller than that of the lower cylindrical portion 62. A top cavity 24 which cooperates with the upper cylinder is also arranged in the housing 21. The top cavity 24 is located above the upper cavity 231, and the top cavity 24 is communicated with the main inlet 211. A main oil passage 64 is provided inside the control plug 6. The main oil passage 64 is provided at the connection between the upper cylindrical portion 61 and the lower cylindrical portion 62 and extends to the lower cylindrical portion 62 away from the end surface center of the upper cylindrical portion 61. When the hydraulic oil enters the housing 21 from the main inlet 211, the control plug 6 first moves downward due to the pressure of the hydraulic oil, so that the upper cylindrical portion 61 is separated from the top cavity 24, so that the hydraulic oil enters the top cavity 24 from the main inlet 211 and then enters the upper cavity 231, and enters the liquid flow channel 221 along the main oil passage 64, so that the hydraulic oil pushes the bottom hydraulic column 14. After the extension of the bottom hydraulic column 14 is completed, the pressure at the main inlet 211 is reduced, and the control plug 6 moves upward, so that the hydraulic oil is blocked in the housing 21, reducing the pressure applied to the control valve 10 connected to the main inlet 211, thereby protecting the control valve 10. One end of the elastic member 4 abuts against the inner stop edge 5 , and the other end abuts against the blocking plug 22 . Meanwhile, an elastic member 4 is also provided in the upper cavity 231 . One end of the elastic member 4 in the upper cavity 231 abuts against the inner stop edge 5 , and the other end abuts against the control plug 6 .

[0036] A cylinder body 1 71 is integrally provided on the side of the control plug 6 facing the blocking plug 22, and a cylinder body 2 72 is integrally provided on the side of the blocking plug 22 facing the control plug 6. The axis of the cylinder body 2 72 coincides with that of the cylinder body 1 71, and one end of the cylinder body 2 72 is inserted into the cylinder body 1 71, and a fourth sealing ring 34 is provided on the outer wall of the cylinder body 2 72, and the fourth sealing ring 34 is used to seal between the cylinder body 1 71 and the cylinder body 2 72. The cylinder body 1 71 and the cylinder body 2 72 can slide relative to each other, and a filter 73 is provided inside the cylinder body 2 72, and the filter 73 is fixed in the cylinder body 2 72. When the hydraulic oil enters the cylinder 1 71 from the main oil channel 64, the hydraulic oil must first pass through the filter 73 in the cylinder 2 72 and then enter the liquid flow channel 221, so that the hydraulic oil can be filtered again before entering the bottom hydraulic column 14, improving the cleanliness of the hydraulic oil, so as to reduce the damage of impurities to the bottom hydraulic column 14 when the bottom hydraulic column 14 is subjected to a large load. The outer wall of the cylinder 1 71 is slidably matched with the guide hole 51. The end where the lower cylindrical part 62 is connected to the upper cylindrical part 61 forms a step surface 65, and the area enclosed by the inside of the cylinder 1 71 on the lower cylindrical part 62 is larger than the area of ​​the step surface 65, ensuring that the hydraulic oil will not open the control plug 6 from one side of the cylinder 1 71.

[0037] refer to Figure 3 and Figure 4 A slag discharge port 213 is also provided on the side wall of one end of the housing 21 close to the main inlet 211. A hand valve 8 is installed on the slag discharge port 213. The slag discharge port 213 is connected from the housing 21 to the connection between the top chamber 24 and the upper chamber 231, and is directly opposite to the opening of the main oil passage 64. The hand valve 8 is usually in a closed state. When the filter 73 needs to be backwashed, the hand valve 8 is opened, and the hydraulic oil refluxed by the bottom hydraulic column 14 during expansion and contraction will backwash the filter 73 through the liquid flow channel 221, and then flow out through the main oil passage 64 and the hand valve 8, thereby reducing the need to remove the filter 73 for cleaning, and can facilitate the regular cleaning of the filter 73.

[0038] A cylindrical head 222 is provided at one end of the blocking plug 22 away from the cylinder body 72, and a fifth sealing ring is provided on the peripheral wall of the cylindrical head 222. The fifth sealing ring 35 seals the cylindrical head 222 and the inner wall of the main outlet 212. The diameter of the cylindrical head 222 is set according to the maximum bearing capacity of the bottom hydraulic column 14. The diameter of the cylindrical head 222 needs to be larger than the diameter of the cylinder body 72 so that when the pressure of the hydraulic oil at the main outlet 212 is too large, the hydraulic oil will push the blocking plug 22 upward. The area between the side of the blocking plug 22 connected to the cylindrical head 222 and the inner wall of the housing 21 is an opening cavity 25, which is connected to the opening port 215. The opening port 215 is located on the side wall of the housing 21. When hydraulic oil is introduced into the opening port 215, the opening port 215 can exert a force on the blocking plug 22 to push the blocking plug 22 upward, and can also connect the pressure relief port 214 with the main outlet 212, so as to allow the hydraulic oil in the bottom hydraulic column 14 to flow back when the filter 73 does not need to be cleaned. In the middle of the blocking plug 22, a radial channel 9 is provided, one end of the radial channel 9 is connected to the liquid flow channel 221, and the other end leads to the side wall of the blocking plug 22 between the two first sealing rings 31, so that the radial channel 9 and the liquid flow channel 221 connect the main outlet 212 with the pressure relief port 214 to ensure that the opening port 215 is disconnected from the main outlet 212.

[0039] The control valve 10 adopts a two-position five-way reversing valve, and the control valve 10 has a P port, a T port, and an A port, a B port, and a C port. The P port is connected to the pump, the T port is connected to the oil tank, and the B port is connected to the C port. When the control valve 10 controls the extension of the bottom hydraulic column 14, the P port is connected to the A port, and the B port is connected to the T port; when the control valve 10 contracts the bottom hydraulic column 14, the P port is connected to the B port, and the T port and the A port are both in a closed state. The A port is connected to the main inlet 211, the B port is connected to the upper inlet 142, the C port is connected to the opening port 215, and the T port is also connected to the pressure relief port 214. At the same time, the manual valve 8 can also be connected to the T port, and the impurities are processed after being recovered into the oil tank.

[0040] The working process of this embodiment is as follows: when in use, when the P port is connected to the A port, and the B port is connected to the T port, when the pressure oil enters the P port toward the A port, the pressure oil opens the control plug 6 and enters the bottom hydraulic column 14 from the lower inlet 141 after passing through the main oil channel 64 and the filter 73. At the same time, the position of the upper inlet 142 is connected to the B port, and the B port is connected to the T port, so that the hydraulic oil on the top of the bottom hydraulic column 14 is directly discharged into the oil tank. At this time, the bottom hydraulic column 14 moves in the direction of extension; when the P port is connected to the B port, the P port enters the pressure oil toward the B port. When the hydraulic oil is supplied to the bottom hydraulic column 14, the B port and the C port are kept in communication, so that the pressure oil first exerts a force on the blocking plug 22 at the opening 215 from the C port, so that the blocking plug 22 can move upward, and the main outlet 212 is connected to the pressure relief port 214 through the radial channel 9, and then the hydraulic oil of the B port enters the bottom hydraulic column 14 from the position of the upper inlet 142, and the hydraulic oil at the lower part of the bottom hydraulic column 14 flows directly back to the oil tank through the main outlet 212, the radial channel 9 and the pressure relief port 214, so that the bottom hydraulic column 14 will move in the direction of contraction under the action of the pressure oil. When the bottom hydraulic column 14 maintains the supporting function, the pump can stop working. Of course, a switch valve can also be set between the pump and the control valve 10 so that the pump can provide pressure oil for multiple hydraulic support devices at the same time, or the control valve 10 can use a reversing valve with an intermediate position. In the intermediate position, the P port is not connected to the A port or the B port, and the T port is not connected to the A port or the B port. When the bottom hydraulic column 14 is in a normal supporting state, the control plug 6 prevents the hydraulic oil in the bottom hydraulic column 14 from flowing back, thereby maintaining the supporting force of the bottom hydraulic column 14. At the same time, when the bottom hydraulic column 14 is subjected to too great an impact, the blocking plug 22 can move upward under the action of the hydraulic oil, so that the hydraulic oil in the bottom hydraulic column 14 is released from the pressure relief port 214, and can be quickly restored after being released under the action of the elastic member 4, so as to cushion the impact on the bottom hydraulic column 14. When the impact is relieved, the blocking plug 22 can still block the pressure relief port 214 to prevent the top beam 13 from falling directly, thereby reducing damage to the bottom hydraulic column 14 when it is impacted, thereby improving safety and stability.

[0041] This embodiment also discloses a hydraulic system of a high-stability combined hydraulic support device, which uses the above-mentioned high-stability combined hydraulic support device to control the bottom hydraulic column.

[0042] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A highly stable combined hydraulic support device, comprising a base (1), a top beam (13) and a bottom hydraulic column (14) arranged between the base (1) and the top beam (13), characterized in that: An upper inlet (142) and a lower inlet (141) are provided on the side wall of the bottom hydraulic column (14); the lower inlet (141) is connected to a pressure relief assembly (2); the upper inlet (142) is connected to a control valve (10); the pressure relief assembly (2) is connected to the control valve (10); the pressure relief assembly (2) comprises a shell (21) and a blocking plug (22); the interior of the shell (21) is an inner cavity (23); the blocking plug (22) is fitted in the inner cavity (23); one end of the shell (21) is provided with a main inlet (211); the other end is provided with a A main outlet (212) is provided, a pressure relief port (214) is provided on the side wall of the housing (21), an elastic member (4) is provided in the inner cavity (23), the elastic member (4) is used to push the blocking plug (22) to separate the main outlet (212) and the pressure relief port (214), and when the bottom hydraulic column (14) releases pressure, the blocking plug (22) is pressed by the pressure of the hydraulic oil to squeeze the elastic member (4), so that the main outlet (212) and the pressure relief port (214) are connected after the blocking plug (22) moves, and a liquid flow channel (221) is provided in the center of the blocking plug (22).

2. A highly stable combined hydraulic support device according to claim 1, characterized in that: An inner retaining edge (5) is arranged inside the inner cavity (23), and the inner retaining edge (5) is provided with an upper cavity (231) and a lower cavity (232) on both sides thereof. The retaining plug (22) is located in the lower cavity (232). A control plug (6) is arranged inside the upper cavity (231), and an elastic member (4) is also arranged between the control plug (6) and the inner retaining edge (5). The control plug (6) comprises an upper cylindrical portion (61) and a lower cylindrical portion (62), and the diameter of the lower cylindrical portion (62) is larger than that of the upper cylindrical portion (61). 1), and the lower cylindrical portion (62) cooperates with the upper cavity (231), a top cavity (24) is further provided in the housing (21), the top cavity (24) is communicated with the main inlet (211), the upper cylindrical portion (61) cooperates in the top cavity (24), a main oil passage (64) is provided in the control plug (6), one end of the main oil passage (64) is located at the connection between the upper cylindrical portion (61) and the lower cylindrical portion (62), and the other end is located at the end surface of the lower cylindrical portion (62) away from the upper cylindrical portion (61).

3. A highly stable combined hydraulic support device according to claim 2, characterized in that: The control plug (6) is provided with a cylinder body (71) on one side facing the blocking plug (22), and the blocking plug (22) is provided with a cylinder body (72) on one side facing the control plug (6). One end of the cylinder body (72) is fitted in the cylinder body (71), and a filter (73) is provided in the cylinder body (72).

4. A highly stable combined hydraulic support device according to claim 3, characterized in that: The shell (21) is provided with a slag discharge port (213), on which a hand valve (8) is installed. The end of the slag discharge port (213) away from the hand valve (8) is used to be connected to the connection between the upper chamber (231) and the top chamber (24).

5. A highly stable combined hydraulic support device according to claim 4, characterized in that: The blocking plug (22) is provided with a cylindrical head (222) at one end away from the second cylinder body (72), and the diameter of the cylindrical head (222) is greater than the diameter of the second cylinder body (72).

6. A highly stable combined hydraulic support device according to claim 5, characterized in that: The blocking plug (22) is connected to one side of the cylindrical head (222) and the inner cavity (23) of the shell (21) to form an open cavity (25). The open cavity (25) is connected to an open port (215). The open port (215) is used to simultaneously allow hydraulic oil to flow into the open cavity (25) when the hydraulic oil enters the upper inlet (142). The blocking plug (22) is provided with a radial channel (9). One end of the radial channel (9) is used to connect to the liquid flow channel (221), and the other end is attached to the side wall of the blocking plug (22).

7. A highly stable combined hydraulic support device according to claim 6, characterized in that: The control valve (10) is a two-position five-way reversing valve, the control valve (10) having a P port, a T port, and an A port, a B port, and a C port. The P port is connected to a pump, the T port is connected to an oil tank, and the B port is connected to the C port. When the control valve (10) controls the extension of the bottom hydraulic column (14), the P port is connected to the A port, and the B port is connected to the T port. When the control valve (10) contracts the bottom hydraulic column (14), the P port is connected to the B port, the T port and the A port are both in a closed state, the A port is connected to the main inlet (211), the B port is connected to the upper inlet (142), the C port is connected to the opening port (215), and the T port is also connected to the pressure relief port (214).

8. A highly stable combined hydraulic support device according to claim 7, characterized in that: One end of the hand valve (8) away from the slag discharge port (213) is connected to the T port.

9. A hydraulic system of a highly stable combined hydraulic support device, characterized in that: A high-stability combined hydraulic support device as described in any one of claims 1 to 8 is used to control the bottom hydraulic column.

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