Support system for advanced-section roadway of fully-mechanized coal mining working face gateway

Abstract

A support system for an advanced section of a mining gateway in a fully-mechanized coal mining face includes a mining roadway in an underground working face, where an advanced section of the mining roadway in the underground working face is sequentially divided into an intense deformation zone, a severe deformation zone, and a mild deformation zone from inside to outside; and a plurality of advanced support groups are disposed in the intense deformation zone, a plurality of unit supports that are connected through connection oil cylinders are disposed inside each advanced support group, and a middle unit support connected to a side unit support through the connection oil cylinder is disposed between two of the advanced support groups.

Description

[0003] At present, a fully-mechanized longwall retreat mining method is developed rapidly, and is mainly characterized in that a roof of a goaf is processed by one-time full seam mining and an all collapse method. During underground mining, in order to prevent a roof of a mining roadway in a working face from subsiding, advanced supporting needs to be performed on the mining roadway in the mining working face. In the existing technology, advanced supports are configured to support, and the advanced supports include two ZCZ15000 / 25 / 42D advanced support groups, with a maximum supporting height of 4200 mm, a total width of 3560 mm, and a supporting length of 21.5 m. The advanced support retreats with movement of the working face.

[0004] However, the following special cases of underground mining (as shown in FIG. 11) are provided.

[0005] 1. In a mining process, due to changes in geological conditions, a 24106 working face is located in a scouring zone, and the souring zone is not conducive to surrounding rock control and can easily lead to roof subsidence and floor heave deformation. 2. Due to a combined effect of an advance supporting pressure of the 24106 working face and a lateral supporting pressure of a 24107 goaf, an advanced influence range and a stress value of the 24106 working face increase. 3. Affected by a mining operation of the 24106 working face, a roof abscission zone of the mining roadway is activated and subsided. During the overall subsidence of the roof, a pressure is transferred from two side slopes to a bottom plate, causing large floor heave deformation.

[0006] Specifically, within 20 m of an advanced working face, a strata pressure behavior is the most intense, the roof subsidence is the largest (up to 200 mm), and the floor heave deformation of the roadway is severe (the floor heave deformation exceeds 600 mm). Within 20m-50m of the advanced working face, the strata pressure behavior is severe, the floor heave deformation of the roadway is 300 mm, and the roof has subsidence of a specific extent. Within 50m-80m of the advanced working face, the strata pressure behavior trends to be alleviated, the roof subsidence of the roadway is small, and floor heave deformation of a specific extent appears (up to 150 mm). 80m after the advanced working face, overall deformation of the roadway is small, and is hardly affected by a mining operation.

[0007] For an advanced large-range deformation zone of the underground working face (an advanced influence range of the mining roadway in the 24106 working face is about 50m), existing advanced supporting (a supporting distance of the advanced support group is 21.6m) is not sufficient for supporting and protection. In addition, the advanced support of the mining roadway in the working face moves forward with the working face step by step from inside to outside. During the movement of the advanced support, the roof is repeatedly supported, and therefore, integrity and stability of the roof of the roadway are easily damaged. Moreover, the large-scale deformation zone also leads to an insufficient height of an end of the working face, and a problem of artificially lowering an underground water level due to an insufficient safety clearance between an end frame and conveyor. SUMMARY

[0008] To resolve the foregoing problem, the present application provides a support system for advanced section of a mining gateway in a fully-mechanized coal mining face.

[0009] The present application is implemented by the following technical solution:

[0010] A support system for an advanced section of a mining gateway in a fully-mechanized coal mining face includes a mining roadway in an underground working face, where an advanced section of the mining roadway in the underground working face is sequentially divided into an intense deformation zone, a severe deformation zone, and a mild deformation zone from inside to outside;

[0011] a plurality of advanced support groups that are connected through push-pull oil cylinders are disposed in the intense deformation zone, a plurality of unit supports that are connected through connection oil cylinders are disposed at a middle non-support roof inside each advanced support group, a middle unit support connected to a side unit support through the connection oil cylinder is disposed between two of the advanced support groups, and a roof of the advanced section is supported by the advanced support group in the intense deformation zone, the unit support, and a retreating frame of the middle unit support; and

[0012] along the advanced section in the mild deformation zone, the severe deformation zone is provided with a row of independent unit supports that are opposite to a center of the advanced support group for supporting.

[0013] Further optionally, the advanced support group includes a plurality of hinged bottom frames on two sides of a bottom of the advanced support group, upper portions of the bottom frames are connected to corresponding top beams through a plurality of hydraulic props for supporting, and two of the bottom frames and outside ends of the top beams are transversely connected through adjustment oil cylinders.

[0014] Further optionally, the unit support inside the advanced support group is further provided with a stable supporting device, and when the unit support moves, the stable supporting device is supported at the bottom frames of the advanced support group to achieve stable support.

[0015] Further optionally, the stable supporting device includes two supporting arms that are hinged on two sides of a base of the unit support, a lower portion of each supporting arm is hinged with and fastened to the base of the unit support through a supporting oil cylinder, and an outside end of the supporting arm is connected to a supporting block that is supported on an inside edge of the bottom frame.

[0016] Further optionally, the supporting arm is a telescopic arm, and is fastened through insertion via a pin shaft, a plurality of rotation slots are provided on an upper portion inside the bottom frame of the advanced support group, and a rolling body for supporting is disposed in each rotation slot.

[0017] Further optionally, a tilting prevention device is disposed on a side portion of the independent unit support, the tilting prevention device includes tilting prevention chains that are connected to two sides of a top beam on an upper portion of the independent unit support, and an outer end of the tilting prevention chain is connected and fastened to an anchor rod cap on an end portion of an anchor rod disposed on the roof of the roadway.

[0018] Further optionally, an adjustment bolt for adjusting a tightness state of the tilting prevention chain is mounted on the tilting prevention chain.

[0019] Further optionally, an offset alarm that is configured to laterally move the independent unit support is disposed at a joint of the anchor rod cap and the tilting prevention chain, the offset alarm includes a frame connected to a lower portion of the anchor rod cap, a mounting sleeve is in threaded connection to an opening at a bottom of the frame, a gas cylinder extending into the frame is disposed in the mounting sleeve, a bursting disc is mounted on an exhaust pipe at a bottom of the gas cylinder, and an alarm whistle connected to an outlet of the exhaust pipe is disposed on a lower portion of the bursting disc.

[0020] Further optionally, a stirrup buckle connected to an outer end of the tilting prevention chain is disposed in the frame in a penetrating manner, and an inner side of the stirrup buckle is attached to a side wall of the gas cylinder.

[0021] Further optionally, the unit supports inside the advanced support group and oil cylinder pillars of the middle unit support are connected through a hydraulic pipeline and a hydraulic directional valve of the advanced support group, the hydraulic directional valve is electrically connected to a hydraulic valve driver, and the hydraulic valve driver is electrically connected to a support controller.

[0022] Compared with the prior art, the present application has the following beneficial effects:

[0023] 1. A dynamic damage caused to the roof by repeated lifting and lowering during the movement of the advanced support group can be remarkably reduced in the solution. During the movement, lowering, and lifting of the advanced support group, the unit support inside is kept in a supporting state, and during the movement of the unit support, the advanced support group is kept in a supporting state. During the movement, the roof of the advanced section is kept in a supporting state without a significant change in an internal stress, and the roof is not damaged by repeated supporting from the advanced support group.

[0024] 2. Alternating movement of the advanced support group and the unit support achieves no weak link supporting for the advanced section of the working face, reducing subsidence of the roof during the movement when there is no passive supporting, and avoiding the problem that artificial underground water level lowering is required due to an insufficient safety clearance, caused by the insufficient height of the end, between an end frame and a conveyor.

[0025] 3. The plurality of unit supports within the range of the advanced support group are moved step by step through change. A hydraulic system of the unit support is connected to an electro-hydraulic control system of the advanced support group to achieve support automatic control, reducing a workload of support movement and improving safety.

[0026] 4. A length and a strength of the advanced support are increased, effectively controlling floor heave caused by pressure transfer in the goaf, and avoiding an insufficient strength of the advanced supporting due to the roof pressure exceeding a design range when the working face is pushed to a zone of a special geological structure, which may cause the roof pressures at both ends of the working face to appear to block the advanced support or cause a roof collapse.

[0027] 5. Supporting of independent unit support is safer and more reliable, ensuring safety of operating space around the independent unit support and greatly reducing a safety risk caused by tilting of the independent unit support. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG. 1 is a schematic diagram of a system layout according to an embodiment of the present application;

[0029] FIG. 2 is a structural stereoscopic view of an advanced support group and a unit support according to an embodiment of the present application;

[0030] FIG. 3 is a schematic diagram of an advanced support group and a unit support in another state according to an embodiment of the present application;

[0031] FIG. 4 is an enlarged view of a partial structure in FIG. 3;

[0032] FIG. 5 is a schematic structural diagram of a supporting arm of a unit support according to an embodiment of the present application;

[0033] FIG. 6 is a schematic diagram of a structure of an independent unit support in a use state according to an embodiment of the present application;

[0034] FIG. 7 is a structural stereoscopic view of an alarm device in FIG. 6;

[0035] FIG. 8 is a schematic diagram of a mounting structure of a bursting disc in FIG. 7;

[0036] FIG. 9 is a schematic diagram of movement of an independent unit support according to an embodiment of the present application;

[0037] FIG. 10 is a schematic diagram of a hydraulic control system for an advanced support group and a unit support according to an embodiment of the present application; and

[0038] FIG. 11 is a schematic diagram of the prior art.

[0039] In the figures: 1, mining roadway in a working face; 2, advanced support group; 201, bottom frame; 202, hydraulic prop; 203, top beam; 204, adjustment oil cylinder; 205, rolling body; 3, push-pull oil cylinder; 4, unit support; 5, middle unit support; 501, supporting arm; 502, supporting oil cylinder; 503, supporting block; 504, pin shaft; 6, connection oil cylinder; 7, independent unit support; 8, tilting prevention chain; 9, adjustment bolt; 10, anchor rod; 11, offset alarm; 12, frame; 13, mounting sleeve; 14, gas cylinder; 15, exhaust pipe; 16, bursting disc; 17, alarm whistle; 18, charging port; 19, stirrup buckle; 20, anchor rod cap; 21, hydraulic directional valve; 22, hydraulic valve driver; 23, support controller; 24, pipeline; 25, steel wire rope; 26, air winch; and 27, device train. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] The present application is further described in detail below in combination with accompanying drawings and specific implementations.

[0041] As shown in FIG. 1, a support system for an advanced section of a mining gateway in a fully-mechanized coal mining face includes a mining roadway 1 in an underground working face. An advanced section of the mining roadway 1 in an underground working face is sequentially divided into an intense deformation zone, a severe deformation zone, and a mild deformation zone from inside to outside. In the intense deformation zone, roof subsidence is large (up to 200 mm), and floor heave deformation of the roadway is severe (the floor heave deformation exceeds 600 mm). In the severe deformation zone that is within 20m-50m of the advanced working face, a strata pressure behavior is severe, the floor heave deformation is 300 mm, and the roof has subsidence of a specific extent. In the mild deformation zone that is within 50m-80m of the advanced working face, the strata pressure behavior trends to be alleviated, the roof subsidence of the roadway is small, and floor heave deformation of a specific extent appears (up to 150 mm).

[0042] Division of the above zones can also be adjusted according to actual data on site. In this way, different supports can be combined to support the deformation zones divided according to different deformation amounts. While stable supporting is ensured, the use of advanced supports can be minimized as much as possible (the advanced support has a large size and occupies large space, and is also difficult to move). Different zones can better adapt to different combinations of supports and supports with better adaptability.

[0043] Embodiment 1

[0044] As shown in FIG. 1 and FIG. 2, a plurality of advanced support groups 2 that are connected through push-pull oil cylinders 3 are disposed in an intense deformation zone. Two of the advanced support groups 2 are connected through the push-pull oil cylinder 3 to move step by step. An overall length of the two advanced support groups 2 and the push-pull oil cylinder 3 is 21.6 m that can completely cover the entire intense deformation zone. A plurality of unit supports 4 that are connected through connection oil cylinders 6 are disposed at a middle non-support roof inside each advanced support group 2. Two of the unit supports 4 may be disposed between left and right supports of each advanced support group. Bases of two unit supports 4 within a same advanced support group are connected through the push-pull oil cylinder 3 of 1.2 m, to move step by step.

[0045] A middle unit support 5 connected to a side unit support 4 through the connection oil cylinder 6 is disposed between two advanced support groups 2. A base of the middle unit support 5 is connected to an outside unit support 4 through an oil cylinder of 1.4 m, to achieve supporting for a non-support zone at a joint between the advanced support groups 2. The roof of the advanced section is supported by the advanced support group 2 in the intense deformation zone, the unit support 4 and the retreating frame of the middle unit support 5. Therefore, a dynamic damage caused to the roof by repeated lifting and lowering during the movement of the advanced support group 2 can be remarkably reduced. During the movement, lowering, and lifting of the advanced support group 2, the unit support inside is kept in a supporting state, and during the movement of the unit support, the advanced support group 2 is kept in a supporting state. During the movement, the roof of the advanced section is kept in a supporting state without a significant change in an internal stress, and the roof is not damaged by repeated supporting from the advanced support group.

[0046] In the severe deformation zone, a row of independent unit supports 7 that are opposite to a center of the advanced support group are disposed along the advanced section in the mild deformation zone for supporting. The independent unit supports 7, 16 independent unit supports 7 in total, are disposed between the advanced support group 2 and a device train 27 in the mild deformation zone. A center distance between the independent unit supports is 2.5 m, and an overall supporting length is 40 meters. Along the roadway, the independent unit supports are disposed opposite to a center of the advanced support group 2, and a distance from an edge of a base of the advanced support group to a working side slope is not less than 1600 mm, increasing an advanced supporting length, effectively controlling floor heave caused by pressure transfer in a goaf, reducing a workload of artificially lowering an underground water level, and preventing the advanced support from tilting due to the floor heave.

[0047] The advanced support group 2 includes a plurality of hinged bottom frames 201 on two sides of a bottom of the advanced support group 2. Upper portions of the bottom frames 201 are connected with corresponding top beams 203 through a plurality of hydraulic props 202 for supporting. Two bottom frames 201 and an outside end of the top beam 203 are transversely connected through an adjustment oil cylinder 204. The adjustment oil cylinders 204 on a top and the bottom of the advanced support group 2 are shrunken to be the shortest, ensuring that a spacing between bases of left and right support parts of the advanced support group 2 is not greater than 1.2 m, enabling five unit supports 5 and five middle unit supports 5 within an advanced range form an integer for supporting, and helping prevent the middle unit support 5 from tilting (the unit support 5 is independently arranged without support).

[0048] Embodiment 2

[0049] As shown in FIG. 3 and FIG. 4, the unit support 4 inside the advanced support group 2 is further provided with a stable supporting device, and when the unit support 4 moves, the stable supporting device is supported at the bottom frames 201 of the advanced support group 2 to achieve stable support. Therefore, the unit support 4 is not prone to tilting while not supporting a roof of a roadway under force (in a free state).

[0050] The stable supporting device includes two supporting arms 501 that are hinged on two sides of a base of the unit support 4. A lower portion of each supporting arm 501 is hinged and fixed to the base of the unit support 4 through a supporting oil cylinder 502. An outside end of the supporting arm 501 is connected to a supporting block 503 supported on an inside edge of the bottom frame 201. When the unit support 4 is configured to support the roof under force, the supporting oil cylinder 502 is started through an operation to eject the supporting arm 501 to attach to a side portion of the unit support 4, avoiding space occupation. When the unit support 4 moves, the supporting arm 501 is unfolded through the supporting oil cylinder 502 to support a side edge of the advanced support group 2, to stably support the unit support 4. Therefore, a width of the advanced support group 2 is not needed to be reduced, and a range for the advanced support group 2 to support the roof is greatly increased. In addition, the unit support is always kept at a center position of the advanced support group 2 to support and apply force to the roof more uniformly, and an additional position of a hydraulic prop is not needed to be adjusted.

[0051] As shown in FIG. 4 and FIG. 5, the supporting arm 501 is a telescopic arm, and is fixed through insertion via a pin shaft 504. A length of the supporting arm 501 is adjusted through the pin shaft 504 to adapt to the advanced support groups 2 of different widths. A plurality of rotation slots are provided on an upper portion inside the bottom frame 201 of the advanced support group 2. A rolling body 205 for supporting is disposed in each rotation slot. The unit support 4 is quickly moved conveniently through the rolling body 205.

[0052] Embodiments

[0053] As shown in FIG. 6, a tilting prevention device is disposed on a side portion of the independent unit support 7. The tilting prevention device includes tilting prevention chains 8 that are connected to two sides of a top beam on an upper portion of the independent unit support 7. The tilting prevention chain 8 is processed by using a 5t anchor chain. An outer end of the tilting prevention chain 8 is connected and fixed to an anchor rod cap 20 on an end portion of an anchor rod 10 disposed on the roof of the roadway. An adjustment bolt 9 for adjusting a tightness state of the tilting prevention chain is mounted on the tilting prevention chain 8. Tilting is avoided through the tilting prevention chains 8 on two sides of the independent unit support 7, and stability of the independent unit support 7 that is matched with the advanced support group 2 in the severe deformation zone for use is improved.

[0054] As shown in FIG. 6 and FIG. 7, an offset alarm 11 that is configured to laterally move the independent unit support 7 is disposed at a joint of the anchor rod cap 20 and the tilting prevention chain 8. The offset alarm 11 includes a frame 12 connected to a lower portion of the anchor rod cap 20, a mounting sleeve 13 is in threaded connection to an opening at a bottom of the frame 12, a gas cylinder 14 extending into the frame 12 is disposed in the mounting sleeve 13, a bursting disc 16 (as shown in FIG. 8) is mounted on an exhaust pipe 15 at a bottom of the gas cylinder 14, and an alarm whistle 17 connected to an outlet of the exhaust pipe 15 is disposed on a lower portion of the bursting disc 16.

[0055] When the independent unit support 7 locally tilts during supporting, the stirrup buckle 19 is pulled by the tilting prevention chain 8 on the other side of the tilting direction to squeeze the gas cylinder 14 of the offset alarm 11. The gas cylinder 14 is stressed to deform, and the exhaust pipe 15 is opened through the bursting disc 16 after gas pressure inside the gas cylinder 14 is rapidly raised to a set bursting pressure of the bursting disc 16. Gas in the gas cylinder 14 is quickly rushed to the alarm whistle 17 on the lower portion, and sound is made by the alarm whistle 17, to remind personnel around to quickly leave the zone. The independent unit support 7 is adjusted and supported again, ensuring safety of operating space around, and greatly reducing a safety risk caused by tilting of the independent unit support 7. In addition, direct impact of the stirrup buckle 19 on the anchor rod cap 20 further can be buffered through the gas cylinder 14, avoiding a damage to an end portion of the anchor rod 10 by direct impact.

[0056] According to a site condition, a pressure of the bursting disc 16 can be set to 2 bar, and a volume of gas in the gas cylinder 14 is 1.5-1.8 bar, ensuring that the bursting disc 16 is burst after the gas cylinder 14 is stressed to deform. In addition, the gas in the gas cylinder 14 is nitrogen gas with high safety. The gas cylinder 14 may be made of metal or polytetrafluoroethylene. The gas cylinder 14 made of polytetrafluoroethylene can be recycled, and is used after being re-inflated through a charging port 18.

[0057] The stirrup buckle 19 that is connected to an outer end of the tilting prevention chain 8 is arranged in the frame 12 in a penetrating manner, and an inner side of the stirrup buckle 19 is attached to a side wall of the gas cylinder 14. The adjustment bolt 9 on the tilting prevention chain 8 can be always kept in a tightened state to ensure attaching between the stirrup buckle 19 and the side wall of the gas cylinder 14.

[0058] As shown in FIG. 10, the unit supports 4 inside the advanced support group 2 and an oil cylinder pillar of the middle unit support 5 are connected through a hydraulic pipeline 24 and a hydraulic directional valve 21 of the advanced support group 2, the hydraulic directional valve 21 is electrically connected to a hydraulic valve driver 22, and the hydraulic valve driver 22 is electrically connected to a support controller 23. A hydraulic system of a plurality of unit supports within the advanced support group 2 is connected to an electro-hydraulic control system of the advanced support group, achieving support automatic control, reducing a support movement workload, and improving safety.

[0059] Working principle:

[0060] When the working face retreats after mining, the advanced supporting for the mining roadway needs to retreat with movement of the working face.

[0061] 1. The unit support 4 and the middle unit support 5 are moved.

[0062] (1) An outside unit support 4 close to the working face is firstly lowered. When the unit support 4 is lowered, an electro-hydraulic control system of the advanced support group is operated by a support worker to lower. During lowering, it is ensured that there is no personnel within a range of 5 m. It should be noted that personnel should not stand at a valve port, preventing the unit support from tilting or a return liquid from harming personnel during lowering.

[0063] (2) The unit support needs to be lowered to a smallest height, and the lowering operation is completed after the unit support is lowered to the smallest height.

[0064] (3) After lowering is completed, the unit supports are moved to a specified step pitch (0.8m) through the connection oil cylinder 6 for connecting bases of two unit supports 4.

[0065] (4) The unit support 4 is lifted to support the roof. After the support unit is lifted, the unit support is tightly connected to the roof, and an initial support force of the unit support is 11.5 MPa or higher.

[0066] (5) The forgoing steps are repeated, a unit support on a rear side is pulled and moved to the specified step pitch, and the middle unit support 5 and the unit support 4 connected to the middle unit support 5 are moved according to the forgoing step principle.

[0067] 2. The independent unit support 7 in the severe deformation zone is moved (as shown in FIG. 9).

[0068] After the device train is moved, the first independent unit support 7 close to the working face is moved to the outmost side for supporting again. The following provides a specific process flow.

[0069] (1) Before the independent unit support is lowered, the tilting prevention chain 8 is artificially removed through the stirrup buckle 19. During lowering, a handle of a hydraulic manual valve is operated by the support worker for lowering. It should be noted that personnel should not stand at a valve port, preventing the unit support from tilting or a return liquid from harming personnel during lowering.

[0070] (2) The independent unit support 7 is lowered to a smallest height, and the lowering operation is completed after the independent unit support 7 is lowered to the smallest height.

[0071] (3) After lowering is completed, the independent unit support 7 is pushed and laterally moved to adjust a position of the independent unit support 7 to a walkway side via the hydraulic pilar.

[0072] (4) A steel wire rope ((pl5.5) is suspended above the roof on a transport path for the independent unit support 7. During transportation, a top beam on the independent unit support 7 is connected to the steel wire rope above for tilting prevention via a special tilting prevention rope (with stirrup buckles at two ends) for transportation.

[0073] (5) The steel wire rope is connected to lifting rings on two sides of the base of the independent unit support through cooperation between a JQHS-50X12 type air winch 26 and a return pulley, to transport the unit support to a position near the device train, at 2.5 m from the unit support at the outermost side.

[0074] (6) The independent unit support 7 is adjusted to a preset support position through the hydraulic prop.

[0075] (7) The independent unit support is lifted to support the roof. After the independent support unit is lifted, the independent unit support is tightly connected to the roof, and an initial support force of the independent unit support is 11.5 MPa or higher.

[0076] (8) After the independent unit support is lifted, the tilting prevention chain 8 of the independent unit support 7 is timely connected to prevent tilting.

[0077] 3. The advanced support group is moved: Firstly, the independent unit support 7 in the severe deformation zone is removed, and supported to the outmost side near the device train, then the unit support inside is moved, and finally, the advanced support group is gradually moved from front to rear, and from outside to inside.

[0078] (1) The bracket controller 23 is operated to lower the hydraulic prop, making the top beam 203 of the advanced support group 2 close to the working face slightly separate from the roof.

[0079] (2) When the advanced support group 2 moves, the hydraulic prop 202 is immediately stopped; and the push-pull oil cylinder 3 is operated to pull the advanced support group 2 close to the working face move forward along the working face, moving the advanced support group 2 to the specified step pitch.

[0080] (3) The hydraulic prop 202 is lifted, making a main top beam of the moved advanced support group 2 be in tight contact with the roof for continuously suppling a liquid for 3-5 s, to ensure an initial support force to be 88.5 KN (11.5 MPa).

[0081] (4) The foregoing steps are repeated to move another advanced support group 2 step by step.

[0082] The above shows and describes the basic principles, main features, and advantages of the present application. It should be understood by those skilled in the art that, the present application is not limited by the above embodiments, and the above embodiments and the description only illustrate the principle of the present application. Various changes and modifications may be made to the present application without departing from the spirit and scope of the present application, and such changes and modifications all fall within the claimed scope of the present application. The claimed protection scope of the present application is defined by the appended claims and equivalents thereof.

Claims

1. A support system for an advanced section of a mining gateway in a fully-mechanized coal mining face, comprising a mining roadway in an underground working face, wherein an advanced section of the mining roadway in the underground working face is sequentially divided into an intense deformation zone, a severe deformation zone, and a mild deformation zone from inside to outside;a plurality of advanced support groups that are connected through push-pull oil cylinders are disposed in the intense deformation zone, a plurality of unit supports that are connected through connection oil cylinders are disposed at a middle non-support roof inside each advanced support group, a middle unit support connected to a side unit support through the connection oil cylinder is disposed between two of the advanced support groups, and a roof of the advanced section is supported by the advanced support group in the intense deformation zone, the unit support, and a retreating frame of the middle unit support; andalong the advanced section in the mild deformation zone, the severe deformation zone is provided with a row of independent unit supports that are opposite to a center of the advanced support group for supporting.

2. The support system for an advanced section of a mining gateway in a fully-mechanized coal mining face according to claim 1, wherein the advanced support group comprises a plurality of hinged bottom frames on two sides of a bottom of the advanced support group, upper portions of the bottom frames are connected to corresponding top beams through a plurality of hydraulic props for supporting, and two of the bottom frames and outside ends of the top beams are transversely connected through adjustment oil cylinders.

3. The support system for an advanced section of a mining gateway in a fully-mechanized coal mining face according to claim 1, wherein the unit support inside the advanced support group is further provided with a stable supporting device, and when the unit support moves, the stable supporting device is supported at the bottom frames of the advanced support group to achieve stable support.

4. The support system for an advanced section of a mining gateway in a fully-mechanized coal mining face according to claim 3, wherein the stable supporting device comprises two supporting arms that are hinged on two sides of a base of the unit support, a lower portion of each supporting arm is hinged with and fastened to the base of the unit support through a supporting oil cylinder, and an outside end of the supporting arm is connected to a supporting block that issupported on an inside edge of the bottom frame.

5. The support system for an advanced section of a mining gateway in a fully-mechanized coal mining face according to claim 4, wherein the supporting arm is a telescopic arm, and is fastened through insertion via a pin shaft, a plurality of rotation slots are provided on an upper portion inside the bottom frame of the advanced support group, and a rolling body for supporting is disposed in each rotation slot.

6. The support system for an advanced section of a mining gateway in a fully-mechanized coal mining face according to claim 1, wherein a tilting prevention device is disposed on a side portion of the independent unit support, the tilting prevention device comprises tilting prevention chains that are connected to two sides of a top beam on an upper portion of the independent unit support, and an outer end of the tilting prevention chain is connected and fastened to an anchor rod cap on an end portion of an anchor rod disposed on the roof of the roadway.

7. The support system for an advanced section of a mining gateway in a fully-mechanized coal mining face according to claim 6, wherein an adjustment bolt for adjusting a tightness state of the tilting prevention chain is mounted on the tilting prevention chain.

8. The support system for an advanced section of a mining gateway in a fully-mechanized coal mining face according to claim 6, wherein an offset alarm that is configured to laterally move the independent unit support is disposed at a joint of the anchor rod cap and the tilting prevention chain, the offset alarm comprises a frame connected to a lower portion of the anchor rod cap, a mounting sleeve is in threaded connection to an opening at a bottom of the frame, a gas cylinder extending into the frame is disposed in the mounting sleeve, a bursting disc is mounted on an exhaust pipe at a bottom of the gas cylinder, and an alarm whistle connected to an outlet of the exhaust pipe is disposed on a lower portion of the bursting disc.

9. The support system for an advanced section of a mining gateway in a fully-mechanized coal mining face according to claim 8, wherein a stirrup buckle connected to an outer end of the tilting prevention chain is disposed in the frame in a penetrating manner, and an inner side of the stirrup buckle is attached to a side wall of the gas cylinder.

10. The support system for an advanced section of a mining gateway in a fully-mechanized coal mining face according to claim 1, wherein the unit supports inside the advanced support group and oil cylinder pillars of the middle unit support are connected through a hydraulic pipeline anda hydraulic directional valve of the advanced support group, the hydraulic directional valve is electrically connected to a hydraulic valve driver, and the hydraulic valve driver is electrically connected to a support controller.INTERNATIONAL SEARCH REPORT International application No. PCT / CN2024 / 143083A. CLASSIFICATION OF SUBJECT MATTER E21D 23 / 00(2006.01)i; E21D 23 / 12(2006.01)i According to International Patent Classification (IPC) or to both national classification and IPC B. FIELDS SEARCHED Minimum documentation searched (classification system followed by classification symbols) IPC:E21D Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched Electronic data base consulted during the international search (name of data base and, where practicable, search terms used) CNKI, CNABS, VEN: SIH, II, fi, support+, bracket, hollow top, group, unit C. DOCUMENTS CONSIDERED TO BE RELEVANT Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No. Y CN 104453970 A (TIANDI SCIENCE &TECHNOLOGY CO., LTD.) 25 March 2015 (2015-03-25) description, paragraphs [0007]-[0021], and figures 1-2 1-7, 10 Y CN 203008942 U (SHANDONG LIYE MACHINERY EQUIPMENT CO., LTD.) 19 June 2013 (2013-06-19) description, paragraphs [0014]-[0024], and figures 1-2 1-7, 10 PX CN 117627706 A (INNER MONGOLIA SHUANGXIN MINING INDUSTRY CO., LTD.) 01 March 2024 (2024-03-01) claims 1-10 1-10 A CN 216950440 U (BEIJING TIANDI HUATAI MINING MANAGEMENT CO., LTD. et al.) 12 July 2022 (2022-07-12) entire document 1-10 A GB 1492586 A (GROETSCHEL KARL MARIA) 23 November 1977 (1977-11-23) entire document 1-10 | | Further documents are listed in the continuation of Box C. | f | See patent family annex. * Special categories of cited documents: “A” document defining the general state of the art which is not considered to be of particular relevance "D" document cited by the applicant in tire international application “E” earlier application or patent but published on or after the international filing date "L" document which may throw doubts on priority claim(s) or which is cited to establish the publication date of another citation or other special reason (as specified) “O” document referring to an oral disclosure, use, exhibition or other means “P” document published prior to the international filing date but later than the priority date claimed “T” later document published after the international filing date or priority date and not in conflict with the application but cited to understand the principle or theory underlying the invention “X” document of particular relevance; the claimed invention cannot be considered novel or cannot be considered to involve an inventive step when the document is taken alone “Y” document of particular relevance; the claimed invention cannot be considered to involve an inventive step when the document is combined with one or more other such documents, such combination being obvious to a person skilled in the art document member of the same patent family Date of the actual completion of the international search Date of mailing of the international search report 12 February 2025 22 February 2025 Name and mailing address of the ISA / CN Authorized officer China National Intellectual Property Administration (ISA / CN) China No. 6, Xitucheng Road, Jimenqiao, Haidian District, Beijing 100088 Telephone No.INTERNATIONAL SEARCH REPORT Information on patent family membersInternational application No.PCT / CN2024 / 143083Patent document cited in search report Publication date (day / month / year) Patent family member(s) Publication date (day / month / year) CN 104453970 A 25 March 2015 None CN 203008942 U 19 June 2013 None CN 117627706 A 01 March 2024 None CN 216950440 U 12 July 2022 None GB 1492586 A 23 November 1977 DE 2355234 Al 07 May 1975

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