CN108612549B - Buffer system for hydraulic support to resist impact and pressure and application thereof - Google Patents
Buffer system for hydraulic support to resist impact and pressure and application thereof Download PDFInfo
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- CN108612549B CN108612549B CN201810772399.3A CN201810772399A CN108612549B CN 108612549 B CN108612549 B CN 108612549B CN 201810772399 A CN201810772399 A CN 201810772399A CN 108612549 B CN108612549 B CN 108612549B
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- 239000007853 buffer solution Substances 0.000 title claims abstract description 27
- 239000000872 buffer Substances 0.000 claims abstract description 67
- 239000011435 rock Substances 0.000 claims abstract description 31
- 230000003139 buffering effect Effects 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 24
- 230000035939 shock Effects 0.000 claims abstract description 15
- 230000001105 regulatory effect Effects 0.000 claims abstract description 6
- 238000013016 damping Methods 0.000 claims description 19
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 238000005056 compaction Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000006096 absorbing agent Substances 0.000 claims description 2
- 239000003245 coal Substances 0.000 description 10
- 239000012530 fluid Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000011217 control strategy Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000004058 oil shale Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 230000009528 severe injury Effects 0.000 description 1
- 238000007619 statistical method Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/14—Telescopic props
- E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props
- E21D15/445—Hydraulic, pneumatic, or hydraulic-pneumatic props comprising a fluid cushion
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/14—Telescopic props
- E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/14—Telescopic props
- E21D15/46—Telescopic props with load-measuring devices; with alarm devices
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/50—Component parts or details of props
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/50—Component parts or details of props
- E21D15/502—Prop bodies characterised by their shape, e.g. of specified cross-section
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Vibration Prevention Devices (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The invention relates to a buffer system for hydraulic support rock burst resistance and application thereof, comprising a stand column, wherein the stand column comprises a movable column, a middle oil cylinder, a bottom oil cylinder and an impact buffer which are sequentially connected, the impact buffer is provided with a pressure sensor and a controller which are connected, and the controller is also electrically connected with a magneto-rheological coil in the impact buffer; pressure information is acquired through the pressure sensor, and the current of the magneto-rheological coil is regulated and switched on and off in real time by the controller, so that the shock-resistant buffer assists in buffering the rock burst received by the upright post. The impact-pressure-resistant buffer system can be conveniently integrated on the existing hydraulic support structure, and is convenient to install and matched with the existing hydraulic support for use. The single mode of traditional dependence large-traffic relief valve pressure release is changed, can effectively protect the buffering pressure release process of stand after adopting this buffer system, promotes the reliability when hydraulic support presses against impact simultaneously, guarantee hydraulic support work safely and effectively.
Description
Technical Field
The invention relates to a buffer system for hydraulic support rock burst resistance and application thereof, and belongs to the technical field of mine support.
Background
Along with the increase of coal resource exploitation depth and exploitation intensity, dynamic disasters such as mine rock burst and the like are increasingly aggravated, and the safety of coal exploitation is seriously threatened. Rock burst refers to dynamic phenomenon of sudden and severe damage caused by instantaneous release of elastic deformation energy of rock mass around a roadway or a working surface, and is often accompanied by phenomena such as coal rock mass throwing, ringing, air waves and the like.
Statistical analysis shows that various mines have reports of rock burst, various coal beds have impact phenomena, the geological structure is simple to complex, the coal beds are thin to super-thick, the dip angle is horizontal to steep, and the roof of conglomerate, sandstone, limestone and oil shale has the rock burst. The rock burst of the coal mine is large in hazard degree and wide in influence range, and is a root cause for inducing other serious accidents of the coal mine. The occurrence of rock burst may induce heavy disasters such as abnormal gas emission, gas explosion and the like.
To cope with the problem that rock burst seriously affects coal mine safety production, many solutions proposed by technicians can be broadly divided into active and passive ones:
the active scheme adopts the measure of preprocessing the top plate, so that the top plate can be controllably and naturally collapsed, and the damage to equipment and operators caused by the impact generated by sudden collapse of the top plate during normal production of the coal mine is prevented. An active scheme is often adopted for areas where the roof of the working face is broken and the risk of collapsing occurs.
Active methods cannot fully control the occurrence of rock burst due to uncertainty in the occurrence of rock burst. Therefore, a passive scheme is often adopted for a working surface with good top plate condition and less prone to rock burst. The passive method mainly adopts the pressure relief buffer of supporting equipment such as a hydraulic support and the like to reduce the rock burst damage. For hydraulic support in a passive method, the main solution at present is as follows:
(1) At present, a large-flow safety valve is additionally arranged in an upright post to solve the impact problem, and the impact ground pressure is prevented from damaging the structure of the bracket and the upright post by means of unloading after the large-flow safety valve exceeds a set pressure; (2) The patent (CN 105134260B) proposes to solve the problem of impact by using the idea of capacity expansion of an expansion cylinder, wherein the capacity expansion and buffering powerful impact-resistant double-telescopic upright post is divided into an air chamber capacity expansion powerful impact-resistant double-telescopic upright post and an expansion cylinder capacity expansion powerful impact-resistant double-telescopic upright post, the air chamber capacity expansion double-telescopic upright post is provided with an air chamber pneumatic hydraulic rod device inside a movable column, and the air chamber inside the movable column is compressed by using the pressure of a middle cylinder after the upright post is impacted to realize buffering; the expansion cylinder capacity-increasing double-telescopic upright post is characterized in that an expansion cylinder structure is arranged in the movable post, and buffering is realized through elastic deformation of the expansion cylinder. (3) The high-speed energy-absorbing anti-impact yielding hydraulic support for the coal mine (patent number CN 201110363855.7) is mainly characterized in that an energy-absorbing anti-impact structure (porous foam aluminum, polyurethane materials, rubber materials and the like) is additionally arranged at the bottom of an upright post of the hydraulic support to absorb impact energy so as to realize buffering.
The following problems remain unsolved in the above method:
1. the support can not be actively regulated and dealt with according to the compaction intensity and strength of rock burst.
2. The buffer structure is additionally arranged on the upright post body, so that the original bracket and the upright post structure are influenced, and the complexity of the manufacturing process and the production cost are increased;
3. when the rock burst happens, huge impact pressure is often generated, and for the mode of installing a large-flow safety valve in the upright post, the large-flow safety valve needs to release a large amount of oil to unload the impact pressure. Because the impact pressure has short action time, the duration of the impact pressure process is from a few seconds to tens of seconds, but the impact load is the largest and only lasts from a few milliseconds to tens of milliseconds, the high-flow safety valve can not respond in time in the process from occurrence to ending of the impact pressure, and therefore the problems of bending, breaking, cylinder explosion and the like of the upright post are caused, and the production safety is seriously influenced.
Therefore, the buffer system for the hydraulic support shock-resistant pressure (hereinafter referred to as the hydraulic support shock-resistant system) provided by the invention solves the problems of timely buffer unloading with overhigh peak pressure and active buffer damping adjustment according to the incoming pressure when the shock-resistant pressure occurs. The method can effectively solve the problem of impact resistance, improves the response speed and the effectiveness of the upright post, and is convenient to apply and replace.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a buffer system for the hydraulic support to resist impact pressure.
The invention also provides a working method of the buffer system for the hydraulic support to resist the impact pressure.
The technical scheme of the invention is as follows:
the buffer system for the hydraulic support to resist the impact pressure comprises a stand column, wherein the stand column comprises a movable column, a middle oil cylinder, a bottom oil cylinder and an impact buffer which are sequentially connected, the impact buffer is provided with a pressure sensor and a controller which are connected, and the controller is also electrically connected with a magneto-rheological coil in the impact buffer; pressure information is acquired through the pressure sensor, and the current of the magneto-rheological coil is regulated and switched on and off in real time by the controller, so that the shock-resistant buffer assists in buffering the rock burst received by the upright post.
Preferably, the shock-resistant buffer comprises a movable column, an upper oil cylinder, an explosion-proof shell and a lower oil cylinder which are connected in sequence; the explosion-proof housing is internally provided with a connector which is used for connecting the upper oil cylinder and the lower oil cylinder, the magnetorheological coil is wound on the connector, and a plurality of damping holes are axially penetrated through the connector.
Preferably, the top end of the movable column is provided with a concave supporting seat, and the concave supporting seat is rigidly connected with a cylinder barrel of the bottom oil cylinder.
Preferably, the upper cylinder comprises an upper cavity cylinder body, an upper cavity piston and an upper cavity end cover, the bottom of the upper cavity cylinder body is connected with the upper end of the connecting body, the upper cavity piston is positioned in the upper cavity cylinder body and is encapsulated through the upper cavity end cover, the movable column penetrates through the upper cavity end cover to be connected with the upper cavity piston, the pressure sensor is arranged at the bottom of the upper cavity cylinder body, and the upper cavity cylinder body is further provided with a liquid injection port.
Preferably, the lower cylinder comprises a lower cavity cylinder body, a lower cavity piston, a spring and a base, the top of the lower cavity cylinder body is connected with the lower end of the connecting body, and the lower cavity piston and the spring are sequentially arranged in the lower cavity cylinder body and are packaged through the base.
Preferably, sealing rings are respectively arranged at the joints of the bottom of the upper cavity cylinder body and the upper end of the connecting body and the joints of the top of the lower cavity cylinder body and the lower end of the connecting body.
Preferably, the shape of the base is hemispherical. The design has the advantages that the base is designed into a spherical structure similar to a traditional upright post, and the base is convenient to be connected with a post nest of the hydraulic support base.
Preferably, the connector is provided with a spiral groove, and the magneto-rheological coil is wound on the connector along the spiral groove.
The hydraulic support comprises a top beam, a base and the buffering system, wherein the upright post is positioned between the top beam and the base, the movable post is connected with the top beam, and the base of the shock-resistant buffer is connected with the base of the hydraulic support.
A method of operating a cushioning system for hydraulic mount impact compaction, comprising the steps of:
(1) The upright post in the buffer system is arranged on the hydraulic support instead of the traditional upright post, wherein the movable post is connected with the top beam, the base of the shock-resistant buffer is connected with the base of the hydraulic support, and the pressure sensor and the controller are respectively connected with an external power supply;
(2) When the roof beam of the hydraulic support has rock burst and the upright post receives impact load, the roof beam moves downwards, the pressure sensor acquires a pressure signal and transmits the pressure signal to the controller, and the controller regulates and switches on and off the current of the magneto-rheological coil in real time, so that the impact-resistant buffer generates damping force and realizes the buffering function;
(3) When the impact buffer consumes impact energy, the high-flow safety valve of the hydraulic support upright post has enough time to open pressure relief, and residual impact energy is released by the high-flow safety valve.
The invention has the beneficial effects that:
1. in the buffer system, the magnetorheological coil is arranged outside the damping channel and isolated from the outside by the explosion-proof shell, and the magnetorheological coil can be operated by opening the explosion-proof shell, so that the buffer system is convenient to replace and maintain. The controller adopts a dynamic regulation strategy, the damping force of the hydraulic support impact-resistant system is regulated in real time in the buffering process, and the yielding amount is actively increased when the pressure in the cavity of the buffer is too high, so that the buffering performance is improved.
2. The improved hydraulic support adopts a series connection buffering thought, the peak pressure and maximum output current parameters of a system controller can be set according to the working environment of the hydraulic support used under different working conditions, and the coil current is controlled so as to provide corresponding damping force for an impact-resistant system of the hydraulic support, so that the application of the buffering system is more flexible, and the buffering process is more stable and reliable.
And meanwhile, the peak pressure parameter is added into the controller, when the impact pressure is greater than the peak pressure of the hydraulic support impact system, the controller controls the coil to be powered off, so that the buffer rapidly decompresses and protects the support upright post, and the response speed is better than that of a high-flow safety valve.
3. The impact-pressure-resistant buffer system can be conveniently integrated on the existing hydraulic support structure, and is convenient to install and matched with the existing hydraulic support for use. The single mode of traditional dependence large-traffic relief valve pressure release is changed, can effectively protect the buffering pressure release process of stand after adopting this buffer system, promotes the reliability when hydraulic support presses against impact simultaneously, guarantee hydraulic support work safely and effectively.
Drawings
FIG. 1 is a schematic view of the overall structure of a cushioning system of the present invention;
FIG. 2 is a schematic diagram of an impact buffer according to the present invention;
FIG. 3 is a cross-sectional view of an impact damper according to the present invention;
FIG. 4 is a schematic view of the upper cylinder structure of the buffer system of the present invention;
FIG. 5 is a block diagram of a damping channel according to the present invention;
FIG. 6 is a schematic view of the lower cylinder structure of the buffer system of the present invention;
wherein: 1. a movable column; 2. a middle oil cylinder; 3. a bottom cylinder; 4. an impact buffer; 401. a movable column; 402. an upper cylinder; 403. an explosion-proof housing; 404. a lower cylinder; 405. a seal ring; 406. a spring; 407. an upper cavity end cap; 408. a liquid injection port; 409. a seal ring; 4010. a magneto-rheological coil; 4011. a damping hole; 4012. a lower chamber cylinder; 4013. a lower chamber piston; 4014. a base; 4015. a connecting body; 4016. an upper chamber cylinder; 4017. a lower cavity end cap; 5. a pressure sensor; 6. a controller; 7. damping channel.
Detailed Description
The invention will now be further illustrated by way of example, but not by way of limitation, with reference to the accompanying drawings.
Example 1:
as shown in fig. 1 to 6, the present embodiment provides a buffer system for hydraulic support impact compression, the buffer system mainly includes an improved upright post, the upright post includes a movable post 1, a middle cylinder 2, a bottom cylinder 3 and an impact buffer 4 which are sequentially connected from top to bottom, the impact buffer 4 is provided with a pressure sensor 5 and a controller 6 which are connected, and the controller 6 is also electrically connected with a magneto-rheological coil in the impact buffer 4; pressure information is acquired through the pressure sensor 5, and the current of the magneto-rheological coil is regulated and switched on and off in real time by the controller 6, so that the impact-resistant buffer 4 is used for assisting in buffering the rock burst received by the upright post.
According to the technical scheme provided by the embodiment, under the mode that the column is used for buffering rock burst by the large-flow safety valve in the traditional mode, the intelligent control shock-resistant buffer is additionally arranged at the bottom end of the column, and the intelligent control shock-resistant buffer is combined with the large-flow safety valve, so that the column can be guaranteed to be rapidly and effectively depressurized when being subjected to the rock burst, and the situation that the column is damaged due to untimely buffering and depressurization is avoided.
The main structure of the shock-resistant buffer comprises a movable column 401, an upper oil cylinder 402, an explosion-proof shell 403 and a lower oil cylinder 404 which are sequentially connected from top to bottom; a connector 4015 is arranged in the flameproof housing 403, the connector 4015 is used for connecting the upper oil cylinder 402 and the lower oil cylinder 404, the magnetorheological coil 4010 is wound on the connector 4015, four damping holes 4011 are axially penetrated through the connector, and the four damping holes 4011 form a damping channel 7 for connecting (an oil cavity of) the upper oil cylinder and (an oil cavity of) the lower oil cylinder.
The top end of the movable column 401 is specially designed into a concave supporting seat, and the concave supporting seat is rigidly connected with a cylinder barrel of the bottom oil cylinder 3. When the hydraulic support upright post is assembled with the base, the spherical surface of the lower part of the upright post is attached to the spherical surface of the support column nest, so that the support base achieves the purpose of bearing the upright post. When the support is lifted or lowered, the stand column and the support base move relatively, and the support column nest and the spherical surface at the bottom of the stand column rub dry. Therefore, in order to reduce the influence on the whole structure of the bracket and the structure of the column after the buffer designed by the invention is additionally arranged as far as possible, the column head of the movable column of the buffer is designed to be consistent with the column nest structure of the bracket, namely to be a spherical surface (shown in the structure of fig. 2 and 401), and is also consistent with the assembly of the column and the bracket base when the column is assembled with the buffer, namely the spherical surface at the bottom of the column is combined with the spherical surface of the column head of the movable column of the buffer, and dry friction occurs during the relative movement. The supporting force and the impact force are ensured to be transmitted along the axis of the impact-resistant system, and the normal work of the hydraulic support is prevented from being influenced by the conditions of pressure deflection and the like.
The upper cylinder 402 comprises an upper cavity cylinder 4016, an upper cavity piston and an upper cavity end cover 407, wherein the bottom of the upper cavity cylinder 4016 is connected with the upper end of a connecting body 4015, the upper cavity piston is positioned in the upper cavity cylinder 4016 and is encapsulated by the upper cavity end cover 407, the movable column 401 penetrates through the upper cavity end cover 407 to be connected with the upper cavity piston, the pressure sensor 5 is arranged in a leading hole at the bottom of the upper cavity cylinder 4016 and is connected with the controller 6 and an external power supply, and the upper cavity cylinder 4016 is also provided with a liquid injection port 408.
The lower cylinder 404 comprises a lower cavity cylinder body 4012, a lower cavity piston 4013, a spring 406 and a base 4014, wherein the top of the lower cavity cylinder body 4012 is connected with the lower end of a connecting body 4015, and the lower cavity piston 4013 and the spring 406 are sequentially arranged in the lower cavity cylinder body and are encapsulated through the base 4014. The appearance of base 4014 is the hemisphere, designs the base into the sphere structure similar with traditional stand, and the convenience is connected with the post nest of hydraulic support base.
In addition, sealing rings 409 and 405 are respectively installed at the connection part of the bottom of the upper cavity cylinder 4016 and the upper end of the connecting body 4015 and the connection part of the top of the lower cavity cylinder 4012 and the lower end of the connecting body 4015.
The connector 4015 is provided with a spiral groove, and the magnetorheological coil 4010 is wound on the connector 4015 along the spiral groove. The controller 6 is electrically connected with the magnetorheological coil 4010, and the operation of the shock absorber is realized by adjusting and controlling the current of the magnetorheological coil 4010 in real time.
The working principle of the buffer system of this embodiment is as follows:
1. system parameter settings (including controller current parameter settings and pressure sensor peak pressure parameter settings)
(1) Controller current parameter setting
The controller is fixed on the outer wall of the buffer cylinder barrel, compares the pressure signals acquired by the pressure sensor, and inputs current with corresponding magnitude to the magnetorheological coil.
The current is determined according to the following steps:
on the one hand, the damping force provided by the buffer under the current operation is required to be larger than or equal to the working resistance of the hydraulic support upright post when the hydraulic support upright post normally works, so that the impact-resistant system is ensured not to act when the hydraulic support normally works.
On the other hand, when the pressure sensor detects the pressure increase, the pressure sensor transmits signals to the controller, and the controller adjusts the current value in real time to enable the rigidity of the buffer to be smaller than that of the upright post, so that the upright post is prevented from being crushed.
(2) Controller peak pressure parameter setting
When the peak pressure of the pressure sensor is set, the hydraulic support is adjusted according to the maximum working resistance of the hydraulic support upright post, so that the hydraulic support impact resistance system is ensured to be corresponding rapidly when the rock burst occurs, and the hydraulic support upright post high-flow safety valve acts before.
2. Control strategy of hydraulic support impact system (program setting in controller)
The controller adopts a real-time adjusting on-off control strategy in the working process of the hydraulic support impact-resistant system, the pressure sensor transmits the measured pressure of the upper cavity of the buffer to the controller, and the controller compares the measured pressure with the set maximum value of the pressure of the upper cavity of the buffer when the impact-free ground pressure exists.
And when the rock burst is avoided, the maximum value of the pressure of the upper cavity of the buffer is P1, the pressure of the upper cavity of the buffer measured in real time is P2, and the peak pressure set by the controller is Pm.
When p1=p2 < Pm, the controller controls the power supply to output normal current to the magnetorheological coil;
when P1< P2< Pm, the controller controls the power supply to output current to the magneto-rheological coil to be correspondingly reduced;
when P1< Pm < P2, the controller controls the magneto-rheological coil to be powered off, so that the magneto-rheological fluid is recovered to a Newtonian fluid state and quickly passes through the damping channel to reduce the pressure of the upper cavity, and therefore the buffer obtains larger yielding pressure to reduce the peak impact pressure, and the buffering process is more stable.
3. Working process of hydraulic support impact-resistant system (action process of whole column impact-resistant ground pressure)
(1) When the upright post is not subjected to impact load, the movable post of the impact-resistant buffer is in a jacking state under the action of the lower cavity spring. The power supply is connected to supply power to the coil power-on system, at the moment, the upper cavity pressure is smaller than the set peak pressure, the controller controls the power supply to supply power to the coil, and the buffer provides corresponding damping force for the buffer system, so that the buffer has certain rigidity, and the normal operation of the hydraulic support is not influenced.
(2) When the stand column receives impact load, the power supply is reduced or disconnected to the coil current through the controller according to the load condition, impact energy is conducted to the impact buffer through the stand column of the hydraulic support, magnetorheological fluid in the upper cavity is pushed by the movable column to enable the upper cavity to be changed into a high-pressure cavity, the magnetorheological fluid flows into the lower cavity through the damping channel from the upper cavity under the pressure action, the buffer action is achieved, and a large-flow safety valve installed on the stand column of the hydraulic support is enabled to be provided with enough time to open for pressure relief, and residual impact energy is released. In the whole buffering process, the rigidity of the buffer is smaller than that of the upright post of the hydraulic support, so that the buffer acts before the high-flow safety valve of the upright post when impact occurs. When the pressure of the buffer is insufficient to dissipate impact energy, the pressure in the column cavity of the hydraulic support rises, and the high-flow safety valve of the column opens to release pressure.
(3) After the rock burst process is finished, the top plate moves downwards by a certain amount and cannot recover.
Example 2:
the hydraulic support comprises a top beam, a base and the buffer system described in the embodiment 1, wherein the improved upright post of the embodiment 1 is arranged between the top beam and the base, the movable post 1 is connected with the top beam, and the base 4014 of the impact buffer is connected with the base of the hydraulic support.
Example 3:
the method of embodiment 1 for operating a hydraulic bracket impact-pressure buffer system, comprising the steps of:
(1) The upright post in the buffer system of the embodiment 1 is arranged on a hydraulic support instead of the traditional upright post, wherein the movable post 1 is connected with a top beam, a base 4014 of an impact-resistant buffer is connected with the base of the hydraulic support, and the pressure sensor 5 and the controller 6 are respectively connected with an external power supply;
(2) When the roof of the hydraulic support has rock burst and the upright is subjected to impact load, the top beam of the support moves downwards, the pressure sensor 5 acquires a pressure signal and transmits the pressure signal to the controller 6, and the controller 6 regulates and switches on and off the current of the magneto-rheological coil in real time, so that the impact-resistant buffer generates damping force, and the impact-resistant buffer works before a high-flow safety valve to realize the buffering function;
(3) When the impact buffer consumes impact energy, the large-flow safety valve of the hydraulic support upright post has enough time to open pressure relief, and residual impact energy is released by the impact buffer later (after the maximum impact energy consumed by the impact buffer is exceeded, the residual impact energy is released by the large-flow safety valve, and the impact buffer strives for enough time for the response of the large-flow safety valve).
When the rock burst process is finished, the top beam has a certain downward movement amount and cannot recover, so that the height of the hydraulic support impact resistance system is required to be reduced after the rock burst process is finished, the power supply of the impact resistance buffer is disconnected, the magnetorheological fluid is restored to a Newton fluid state, under the action of a spring in an oil cylinder at the lower part of the impact resistance buffer, the magnetorheological fluid in the lower cavity is pushed to the upper cavity to completely eject the compressed movable column in the buffering process, and the reset of the impact resistance buffer is completed.
Claims (6)
1. The buffer system for the hydraulic support to resist the impact and the pressure is characterized by comprising a stand column, wherein the stand column comprises a movable column, a middle oil cylinder, a bottom oil cylinder and an impact buffer which are sequentially connected, the impact buffer is provided with a pressure sensor and a controller which are connected, and the controller is also electrically connected with a magneto-rheological coil in the impact buffer; the pressure information is acquired through the pressure sensor, and the current of the magneto-rheological coil is regulated and switched on and off in real time by the controller, so that the impact-resistant buffer assists in buffering the rock burst received by the upright post;
the shock-resistant buffer comprises a movable column, an upper oil cylinder, an explosion-proof shell and a lower oil cylinder which are connected in sequence; the explosion-proof shell is internally provided with a connecting body which is used for connecting the upper oil cylinder and the lower oil cylinder, the magnetorheological coil is wound on the connecting body, and a plurality of damping holes are axially penetrated through the connecting body;
the top end of the movable column is provided with a concave supporting seat, and the concave supporting seat is rigidly connected with a cylinder barrel of the bottom oil cylinder;
the upper cylinder comprises an upper cavity cylinder body, an upper cavity piston and an upper cavity end cover, the bottom of the upper cavity cylinder body is connected with the upper end of the connecting body, the upper cavity piston is positioned in the upper cavity cylinder body and is encapsulated through the upper cavity end cover, the movable column penetrates through the upper cavity end cover to be connected with the upper cavity piston, the pressure sensor is arranged at the bottom of the upper cavity cylinder body, and the upper cavity cylinder body is also provided with a liquid injection port;
the lower cylinder comprises a lower cavity cylinder body, a lower cavity piston, a spring and a base, the top of the lower cavity cylinder body is connected with the lower end of the connecting body, and the lower cavity piston and the spring are sequentially arranged in the lower cavity cylinder body and are packaged through the base.
2. The buffer system of claim 1, wherein sealing rings are respectively arranged at the connection part of the bottom of the upper cavity cylinder body and the upper end of the connecting body and the connection part of the top of the lower cavity cylinder body and the lower end of the connecting body.
3. The cushioning system of claim 1, wherein said base is hemispherical in shape.
4. The cushioning system of claim 1, wherein the connector is formed with a helical groove, and the magnetorheological coil is wound around the connector along the helical groove.
5. A hydraulic mount comprising a top beam, a base and a cushioning system according to any one of claims 1-4, wherein the upright is located between the top beam and the base, the live post is connected to the top beam, and the base of the shock absorber is connected to the base of the hydraulic mount.
6. A method of operating a cushioning system for hydraulic bracket impact compaction according to any one of claims 1-4, comprising the steps of:
(1) The upright post in the buffer system is arranged on the hydraulic support instead of the traditional upright post, wherein the movable post is connected with the top beam, the base of the shock-resistant buffer is connected with the base of the hydraulic support, and the pressure sensor and the controller are respectively connected with an external power supply;
(2) When the roof beam of the hydraulic support has rock burst and the upright post receives impact load, the roof beam moves downwards, the pressure sensor acquires a pressure signal and transmits the pressure signal to the controller, and the controller regulates and switches on and off the current of the magneto-rheological coil in real time, so that the impact-resistant buffer generates damping force and realizes the buffering function;
(3) When the impact buffer consumes impact energy, the high-flow safety valve of the hydraulic support upright post has enough time to open pressure relief, and residual impact energy is released by the high-flow safety valve.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810772399.3A CN108612549B (en) | 2018-07-13 | 2018-07-13 | Buffer system for hydraulic support to resist impact and pressure and application thereof |
| PCT/CN2019/089090 WO2019192627A1 (en) | 2018-07-13 | 2019-05-29 | Buffer system for hydraulic support impact ground pressure resistance, and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810772399.3A CN108612549B (en) | 2018-07-13 | 2018-07-13 | Buffer system for hydraulic support to resist impact and pressure and application thereof |
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| CN108612549A CN108612549A (en) | 2018-10-02 |
| CN108612549B true CN108612549B (en) | 2023-10-24 |
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| WO (1) | WO2019192627A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108612549B (en) * | 2018-07-13 | 2023-10-24 | 山东科技大学 | Buffer system for hydraulic support to resist impact and pressure and application thereof |
| CN109707678B (en) * | 2018-12-28 | 2020-12-11 | 北京天地玛珂电液控制系统有限公司 | Pressure cylinder, hydraulic impact testing system and method |
| CN110206567B (en) * | 2019-05-23 | 2021-06-22 | 天地科技股份有限公司 | Energy-absorbing impact-resistant telescopic upright column and impact-resistant method thereof |
| CN110284912B (en) * | 2019-07-20 | 2020-08-25 | 山西能源学院 | Self-gravity pressure relief buffer device for mining hydraulic prop |
| CN111075483B (en) * | 2019-12-10 | 2020-10-30 | 新昌县陆恒机械有限公司 | Mining suspension monomer hydraulic means |
| CN113586107A (en) * | 2021-09-06 | 2021-11-02 | 山西银锋科技有限公司 | Power generation system utilizing mine pressure |
| CN113818927B (en) * | 2021-10-14 | 2024-03-15 | 山东省煤田地质规划勘察研究院 | Rock burst control device with energy guiding function |
| CN114086996B (en) * | 2021-11-16 | 2023-12-01 | 重庆大学 | Hierarchical energy-absorbing self-starting anti-impact device and method |
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| GB201104679D0 (en) * | 2011-03-21 | 2011-05-04 | Cenpart Ltd | Improvements in or relating to shock absorbing member or safety barriers |
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| WO2019192627A1 (en) | 2019-10-10 |
| CN108612549A (en) | 2018-10-02 |
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