A hydraulic support and coal mining system with a rock-blocking device

Abstract

This utility model relates to the technical field of coal mine safety devices, and more particularly to a hydraulic support and coal mining system with a rock-blocking device. The rock-blocking device includes a driver, a sliding assembly, and a protective net. When the protective net is in the protective position, it is suitable for blocking rock rolling down from directly above the conveyor connected to the hydraulic support during operation. When the protective net is in the avoidance position, it is located close to the support column and is suitable for moving away from the conveyor. Its advantages are that by setting the sliding assembly along the bottom of the top beam and driving the protective net to move flexibly along the sliding assembly, precise switching between the protective and avoidance positions can be achieved. In the protective position, the protective net covers directly above the conveyor, effectively intercepting rock rolling down from steeply inclined coal seams, fundamentally ensuring the safety of maintenance personnel. In the avoidance position, the protective net is away from the conveyor, avoiding interference and collision with the conveyor's operation, and protecting the stable operation of the equipment.

Description

Technical Field

[0001] This utility model relates to the technical field of coal protection devices, and in particular to a hydraulic support and coal mining system with a gangue blocking device. Background Technology

[0002] In the industry, steeply dipped coal seams typically refer to those with dip angles between 25° and 55°. These seams exhibit significantly different characteristics from gently dipping coal seams during mining. When the dip angle exceeds 25°, the falling rock in the goaf will slide down the dip direction under gravity, forming an asymmetrical goaf shape with the lower part filled and the upper part suspended. This characteristic directly leads to a fundamental difference in the rock strata movement pattern compared to gently dipping coal seams below 25°. Due to the high kinetic energy and difficulty in controlling the rockfall, personnel protection in steeply dipped working faces remains a core critical factor for safe coal mine operations. Among these, rockfall protection along the coal mining machine track (including the conveyor and the coal mining machine operating area) is particularly important. Once the protection fails, the falling rock will directly pose a serious safety threat to maintenance and operating personnel.

[0003] Currently, the protective measures for maintenance personnel on the track of coal mining machines in steeply inclined coal seams in China still largely rely on the traditional method of workers suspending simple chains or fixing metal guardrails on-site. This method has several prominent problems: First, the working space in steeply inclined working faces is tilted, and operators are prone to slipping and falling due to instability when suspending chains or installing metal guardrails. Second, these protective devices are all fixed structures, and the coal mining machine cannot actively avoid collisions as it moves along the track, leading to frequent collisions between the machine and the guardrails or chains. This can easily damage the coal mining machine and accelerate the wear and tear on the chains or wire ropes. Third, after repeated collisions, the chains and wire ropes are prone to breakage, and the metal guardrails or chains may fall off, creating new hazards and seriously affecting operational safety.

[0004] Therefore, there is an urgent need for a hydraulic support and coal mining system with a rock-blocking device that can be installed and operated without personnel inside the dangerous coal mining machine tunnel. Utility Model Content

[0005] (a) Technical problems to be solved In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a hydraulic support and coal mining system with a rock-blocking device, which solves the technical problem that the prior art requires personnel to perform installation and operation in the dangerous coal mining machine tunnel.

[0006] (II) Technical Solution To achieve the above objectives, the main technical solutions adopted by this utility model include: This utility model provides a hydraulic support with a rock-blocking device, including a top beam and a column, and a rock-blocking device comprising a driver, a sliding assembly, and a protective net. The driver is fixed to the top beam, the sliding assembly is arranged along the left-right direction at the bottom of the top beam outside the column, and the protective net is slidably connected to the sliding assembly. The driver is driven to move the protective net between a protected position and a clearance position along the sliding assembly. When the protective net is in the protected position, it is located away from the column and is suitable for blocking rock from rolling down directly above the transport machine adapted to the hydraulic support during operation. When the protective net is in the clearance position, it is located close to the column and is suitable for moving away from the transport machine.

[0007] Optionally, the sliding assembly includes a slide rail fixed to the top beam, and the slide rail has an elongated hole extending in the left-right direction; the protective net includes a mesh panel, a long strip-shaped slider, and multiple pins; the length direction of the slider is the same as the extension direction of the elongated hole, the top of the mesh panel is fixed to the slider, and the multiple pins are arranged at intervals along the length direction of the slider, with each pin passing through the slider and the elongated hole in sequence, so as to slide the slider to the slide rail.

[0008] Optionally, a connecting ear is provided between the driver and the slider, with one end of the connecting ear fixedly connected to the slider and the other end of the connecting ear connected to the driver.

[0009] Optionally, the actuator is a hydraulic rod, the axis of which is parallel to the length direction of the elongated hole and the length direction of the slider.

[0010] Optionally, the width of the mesh is in the range of 1m-1.2m, and the length of the mesh is in the range of 2m-2.2m.

[0011] Optionally, the length of the elongated hole is in the range of 2m-2.2m.

[0012] Optionally, the sliding assembly also includes multiple connecting pieces; the two ends of the connecting pieces are fixedly connected to the top beam and the slide rail respectively, and the multiple connecting pieces are spaced apart in the left-right direction.

[0013] Another embodiment of this utility model provides a coal mining system with a rock-blocking device, including multiple hydraulic supports and a conveyor. The conveyor is located in an area away from the columns below the top beams of the multiple hydraulic supports, and the running direction of the conveyor is perpendicular to the length direction of the top beams. At least some of the multiple hydraulic supports are hydraulic supports with rock-blocking devices.

[0014] Optionally, a hydraulic support with a rock-blocking device may be installed every 15-20 hydraulic supports in a plurality of hydraulic supports.

[0015] (III) Beneficial Effects The beneficial effects of this utility model are: This utility model provides a hydraulic support with a rock-blocking device, including a top beam and a column, and a rock-blocking device comprising a driver, a sliding assembly, and a protective net. The driver is fixed to the top beam, the sliding assembly is arranged along the entire length of the top beam at the bottom of the top beam outside the column, and the protective net is slidably connected to the sliding assembly. The driver is driven to move the protective net along the sliding assembly between a protected position and a clearance position. When the protective net is in the protected position, it is located away from the column, suitable for blocking rock from rolling down directly above the transport machine used by the hydraulic support during operation. When the protective net is in the clearance position, it is located close to the column, suitable for moving away from the transport machine. Compared with the prior art, the structure of the sliding assembly extending along the entire length of the bottom of the top beam allows the driver to drive the protective net to move flexibly along the sliding assembly, achieving precise switching between the protected and clearance positions. When in the protective position, the protective netting covers directly above the conveyor, effectively intercepting rockfalls from steeply inclined coal seams and fundamentally ensuring the safety of maintenance personnel. When in the avoidance position, the protective netting is away from the conveyor, preventing interference and collisions and protecting the stable operation of the equipment. The device is directly integrated into the top beam, eliminating the need for on-site installation in dangerous sections of the conveyor, avoiding the risk of slipping during operations, perfectly adapting to steeply inclined working faces, balancing protective reliability with equipment compatibility, and significantly improving operational safety and production efficiency.

[0016] This utility model also provides a coal mining system with a rock-blocking device, including multiple hydraulic supports and a conveyor. The conveyor is located below the top beam of the multiple hydraulic supports, away from the columns, and its running direction is perpendicular to the length direction of the top beam. At least some of the hydraulic supports are equipped with rock-blocking devices. Compared with the prior art, by integrating the hydraulic supports with rock-blocking devices and the conveyor, efficient coordination between protection and operation is achieved. The protective net can flexibly switch positions along the sliding components at the bottom of the top beam. In the protection position, it accurately intercepts rock rolling down from above the conveyor, fundamentally ensuring the safety of maintenance personnel; in the avoidance position, it is far away from the conveyor, avoiding interference and collisions during equipment operation, and ensuring production continuity. The system does not require personnel to install it on-site in dangerous machine tracks, avoids the risk of slipping during operation, perfectly adapts to steeply inclined coal seam conditions, balances protection reliability and equipment compatibility, and significantly improves operational safety and production efficiency. Attached Figure Description

[0017] Figure 1 This is a front view of Embodiment 1 of the hydraulic support with a rock-blocking device of the present invention, wherein the protective net is in the clearance position; Figure 2 for Figure 1 The diagram shows a front view of a hydraulic support with a rock-blocking device, where the protective netting is in the protective position; Figure 3 for Figure 1A bottom view of the top beam in a hydraulic support with a rock-blocking device is shown. Figure 4 for Figure 1 A partial front view of the top beam in a hydraulic support with a rock-blocking device is shown. Figure 5 for Figure 1 A front view of the slider in a hydraulic support with a rock-blocking device; Figure 6 for Figure 1 A front view of the slide rail in a hydraulic support with a rock-blocking device is shown. Figure 7 This is a schematic diagram of Embodiment 2 of the coal mining system with a gangue-blocking device of this utility model.

[0018] Explanation of reference numerals in the attached figures 1: Hydraulic support; 1': Ordinary hydraulic support; 11: Top beam; 12: Column; 2: Conveyor; 3: Rockfall retaining device; 31: Driver; 32: Sliding assembly; 321: Slide rail; 3211: Elongated hole; 322: Connecting piece; 33: Protective net; 331: Mesh panel; 332: Sliding block; 333: Pin; 34: Connecting lug. Detailed Implementation

[0019] To better explain and facilitate understanding of this utility model, a detailed description of its specific embodiments is provided below with reference to the accompanying drawings. In this document, directional terms such as "upper," "lower," "left," "right," "front," and "rear" are used interchangeably with other directional terms. Figure 1 The orientation is used as a reference. Here, "up" refers to the direction closer to the top beam, "down" refers to the direction farther from the top beam, "left" refers to the direction closer to the transport aircraft, "right" refers to the direction farther from the transport aircraft, "forward" refers to the direction the transport aircraft is traveling, and "backward" refers to the opposite direction the transport aircraft is traveling. Example 1: Reference Figures 1 to 6 This embodiment describes a hydraulic support with a rock-blocking device, used in steeply inclined coal seams to prevent rockfalls that could cause injury. Specifically, the hydraulic support 1 with a rock-blocking device in this embodiment includes a top beam 11, a column 12, and a rock-blocking device 3, as detailed below.

[0020] The hydraulic support 1 in this embodiment is used in a fully mechanized coal mining face. The fully mechanized coal mining face includes the hydraulic support 1 (i.e., the hydraulic support with a rock-blocking device 3), the ordinary hydraulic support 1' without the rock-blocking device 3, the conveyor 2, and the coal mining machine. All hydraulic supports 1 (whether or not they have a rock-blocking device 3) are spaced apart along the extension direction of the coal mine passage. The conveyor 2 extends along the extension direction of the coal mine passage. The coal mining machine is located on the side of the conveyor 2 away from the hydraulic support 1. Multiple coal mining machines are spaced apart along the extension direction of the conveyor 2. The coal mining machine mines coal along the side adjacent to the coal mine passage. When the coal mining machine is mining coal, in addition to the normal coal, there is also rock, which will fall from the coal mining machine onto the conveyor 2.

[0021] The hydraulic support 1 in this embodiment, which prevents injury from falling coal gangue, includes a top beam 11 and a column 12. A coal gangue blocking device 3 is connected to the top beam 11 and includes a driver 31, a sliding component 32, and a protective net 33. The driver 31 is fixed to the end of the top beam 11 by welding, screwing, or snapping. The sliding component 32 is arranged along the entire length of the top beam 11 at the bottom and is located outside the column 12, avoiding spatial interference with the column 12 and providing a stable sliding support foundation for the protective net 33.

[0022] The protective net 33 and the sliding component 32 form a slidable fit. The driver 31 is connected to the protective net 33, and the action of the driver 31 drives the protective net 33 to move back and forth along the sliding component 32, realizing the switching between the protective position and the avoidance position. When the protective net 33 moves to the protective position away from the column 12, the protective net 33 is located directly above the conveyor 2 adapted to the hydraulic support 1, which can effectively intercept the rolling gangue, making it convenient for maintenance personnel to carry out maintenance on the stopped conveyor 2. When the protective net 33 moves to the avoidance position close to the column 12, it actively moves away from the area where the conveyor 2 is located, avoiding affecting the operation of the conveyor 2.

[0023] In summary, the sliding assembly 32 is installed along the bottom of the top beam 11, and the protective net 33 is driven by the driver 31 to move flexibly along the sliding assembly 32, achieving precise switching between the protective position and the avoidance position. In the protective position, the protective net 33 covers the area directly above the conveyor 2, effectively intercepting the gangue rolling down from the steeply inclined coal seam, fundamentally ensuring the safety of maintenance personnel on the track. In the avoidance position, the protective net 33 is away from the conveyor 2, avoiding interference and collision with the operation of the conveyor 2, and protecting the stable operation of the equipment. The gangue blocking device 3 is directly integrated into the top beam 11, eliminating the need for personnel to install it on-site in the dangerous track, avoiding the risk of slipping during operation, perfectly adapting to the working conditions of steeply inclined working faces, balancing protective reliability and equipment operation compatibility, and significantly improving operational safety and production efficiency.

[0024] Furthermore, the sliding component 32 includes a slide rail 321, which is fixedly connected to the top beam 11 by means of screwing, welding, or snap-fitting. The extension direction of the slide rail 321 is adapted to the length direction of the top beam 11. An elongated hole 3211 is provided on the slide rail 321, which extends through the slide rail 321 in the left-right direction, providing a guiding foundation for the sliding of the protective net 33.

[0025] The protective net 33 includes a mesh panel 331, a long slider 332, and multiple pins 333. The length direction of the slider 332 is consistent with the extension direction of the slide rail 321 and the elongated hole 3211 to ensure stability during sliding. The top of the mesh panel 331 is fixedly connected to the slider 332 by means of screwing, welding, or snap-fitting, so that the mesh panel 331 can move synchronously with the slider 332.

[0026] Multiple pins 333 are evenly spaced along the length of the slider 332. Each pin 333 passes through the elongated hole 3211 of the slider 332 and the slide rail 321 in sequence. Through the cooperation of the pins 333 and the elongated hole 3211, the slider 332 is movably assembled onto the slide rail 321, so that the slider 332 drives the mesh 331 to slide along the elongated hole 3211, providing structural support for switching between the protective position and the avoidance position.

[0027] Furthermore, to achieve stable power transmission between the actuator 31 and the slider 332, a connecting lug 34 is added as a transition component. One end of the connecting lug 34 is fixedly connected to the slider 332 by welding, screwing, or snap-fitting to ensure sufficient connection strength to drive the slider 332 to slide along the slide rail 321, preventing loosening or detachment during power transmission. The other end of the connecting lug 34 is connected to the output end of the actuator 31 by a pin 333, screwing, or snap-fitting to form an anti-detachment connection, enabling the extension or driving action of the actuator 31 to be accurately transmitted to the slider 332. In turn, the slider 332 drives the mesh 331 to smoothly switch positions along the elongated hole 3211 of the slide rail 321, ensuring the stable realization of the protective function.

[0028] Specifically, the actuator 31 is a hydraulic rod, and the adapter hydraulic support 1 includes multiple hydraulic rods to provide a power source for the actuator 31, meeting the power transmission requirements of underground coal mine working conditions. The axial direction of the hydraulic rod is consistent with the extension direction of the elongated hole 3211 of the slide rail 321 and the length direction of the slider 332, and the three are arranged in parallel. This structural design allows the driving force output by the hydraulic rod to be accurately transmitted along the sliding direction of the protective net 33, avoiding off-center loading or interference during power transmission, ensuring that the slider 332 drives the net 331 to move smoothly and steadily along the elongated hole 3211, and ensuring the reliability and stability of the switching action between the protective position and the avoidance position.

[0029] Specifically, the dimensions of mesh panel 331 are determined by combining the protection requirements of the steep-angle working face with the available space for equipment layout. The width of mesh panel 331 is determined based on the distance between the column 12 and the conveyor 2, as well as the width of the conveyor 2, ensuring that it covers the area directly above the conveyor 2. The width of mesh panel 331 is set within the range of 1m-1.2m, which can accurately cover the core protection area directly above the conveyor 2, ensuring that no rock debris is missed during interception. The length of the mesh 331 is based on the vertical distance between the top beam 11 and the conveyor 2. The length of the mesh 331 is controlled between 2m and 2.2m. This not only meets the protection height requirement from the bottom of the top beam 11 to the side of the conveyor 2, but also allows it to fit snugly against the side space of the hydraulic support 1 column 12 when retracted to the clearance position, avoiding interference with surrounding equipment. During the process of moving the mesh 331 from the clearance position to the protection position, the mesh 331 can remain vertical and not be blocked or curled by the conveyor 2. At the same time, when the mesh 331 is in the protection position, the distance between the bottom edge of the mesh 331 and the conveyor 2 is insufficient for the gangue to pass through.

[0030] Preferably, the mesh 331 is any one of the following: high-strength polyester fiber mesh 331, flame-retardant aramid fiber, or a composite fiber material made of steel wire rope core and polyester fiber. The mesh 331 can be rolled up in the vertical direction. In order to adapt to different heights of the conveyor 2, the mesh 331 can be fixed by binding wire or iron wire after being rolled up to maintain a reasonable height difference with the conveyor 2.

[0031] Specifically, the length of the elongated hole 3211 is set according to the movement stroke requirements of the protective net 33, and the value ranges from 2m to 2.2m. The length-adaptive slider 332 drives the net 331 to switch between the protective position and the avoidance position. This ensures that the protective net 33 completely covers the protective area directly above the transport machine 2 when it moves to the protective position, and also meets the storage requirements of the net 331 close to the column 12 when it is in the avoidance position. At the same time, it provides sufficient space for the pin 333 to slide in the elongated hole 3211, avoiding the limitation of stroke affecting the switching action. The cooperation relationship between the pin 331 and the slider 332 forms a stable guiding structure.

[0032] Furthermore, the sliding assembly 32 also includes multiple connecting pieces 322. The two ends of each connecting piece 322 are fixedly connected to the top beam 11 and the slide rail 321 respectively by welding, screwing, or snap-fitting, ensuring the assembly stability between the slide rail 321 and the top beam 11. The multiple connecting pieces 322 are evenly spaced along the left-right direction, providing uniform support for the slide rail 321 to prevent deformation during stress or sliding. They also adapt to the spatial layout of the bottom of the top beam 11, without affecting the installation and operation of other components. This, combined with the elongated hole 3211 structure of the slide rail 321 and the sliding requirements of the slider 332, provides a reliable structural foundation for the smooth movement of the protective net 33.

[0033] Example 2: Reference Figure 7 This embodiment proposes a coal mining system with a gangue blocking device, which includes multiple hydraulic supports and a conveyor 2, as detailed below.

[0034] In this embodiment, the rock-blocking system is adapted to a steeply inclined coal seam fully mechanized mining face and consists of multiple hydraulic supports and a conveyor 2 working together. The multiple hydraulic supports are arranged at intervals along the direction of the coal mine passage. The top beam 11 serves as the main load-bearing structure of the hydraulic support 1, and the column 12 is supported below the top beam 11.

[0035] The conveyor 2 is deployed along the direction of the coal mine passage, and is located in the area below the top beam of all hydraulic supports and away from the column 12. Its running direction is perpendicular to the length direction of the top beam, and it can just receive the coal cut off by the coal mining machine and transport it outward.

[0036] Among the multiple hydraulic supports, at least some are the hydraulic supports 1 used in steeply inclined coal seams as described in Example 1. All hydraulic supports 1 used in steeply inclined coal seams are equipped with the rock-blocking device 3 as described in Example 1. By adapting the position of the rock-blocking device 3 to the conveyor 2, a targeted track protection system is formed. The remaining hydraulic supports are ordinary hydraulic supports 1' without the rock-blocking device 3.

[0037] Specifically, the hydraulic supports 1 equipped with rock-blocking devices are arranged at intervals, with one hydraulic support 1 equipped with a rock-blocking device as described in Example 1 placed every 15 to 20 hydraulic supports. This interval distance is determined in conjunction with the working face width and the coverage area of ​​the rock-rolling debris.

[0038] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0039] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0040] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0042] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A hydraulic support with a rock-blocking device, comprising a top beam (11) and a column (12), characterized in that: It also includes a rock-blocking device (3), which includes a driver (31), a sliding assembly (32), and a protective net (33). The driver (31) is fixed to the top beam (11), the sliding component (32) is arranged along the left and right direction in the area outside the column (12) at the bottom of the top beam (11), the protective net (33) is slidably connected to the sliding component (32), the driver (31) is driven to connect with the protective net (33) to drive the protective net (33) to move along the sliding component (32) between the protective position and the avoidance position; When the protective net (33) is in the protective position, the protective net (33) is located away from the column (12), which is suitable for blocking the gangue rolling down directly above the transport machine (2) adapted to the hydraulic support when it is working; When the protective net (33) is in the clearance position, the protective net (33) is located close to the column (12) and is suitable for being far away from the transport aircraft (2).

2. The hydraulic support with a rock-blocking device as described in claim 1, characterized in that: The sliding assembly (32) includes a slide rail (321), which is fixed to the top beam (11). The slide rail (321) has an elongated hole (3211) extending in the left-right direction. The protective net (33) includes a mesh panel (331), a long strip slider (332), and multiple pins (333). The length direction of the slider (332) is the same as the extension direction of the elongated hole (3211). The top end of the mesh (331) is fixed on the slider (332). A plurality of pins (333) are arranged at intervals along the length direction of the slider (332), and each pin passes through the slider (332) and the elongated hole (3211) in sequence, so that the slider (332) is slidably connected to the slide rail (321).

3. The hydraulic support with a rock-blocking device as described in claim 2, characterized in that: A connecting ear (34) is provided between the driver (31) and the slider (332). One end of the connecting ear (34) is fixedly connected to the slider (332), and the other end of the connecting ear (34) is connected to the driver (31).

4. The hydraulic support with a rock-blocking device as described in claim 2, characterized in that: The actuator (31) is a hydraulic rod, and the axis of the hydraulic rod is parallel to the length direction of the elongated hole (3211) and the length direction of the slider (332).

5. The hydraulic support with a rock-blocking device as described in claim 2, characterized in that: The width of the mesh (331) is in the range of 1m-1.2m, and the length of the mesh (331) is in the range of 2m-2.2m.

6. The hydraulic support with a rock-blocking device as described in claim 2, characterized in that: The length of the elongated hole (3211) is in the range of 2m-2.2m.

7. The hydraulic support with a rock-blocking device as described in claim 2, characterized in that: The sliding component (32) also includes a plurality of connecting pieces (322); The two ends of the connecting piece (322) are fixedly connected to the top beam (11) and the slide rail (321) respectively, and multiple connecting pieces (322) are spaced apart in the left and right direction.

8. A coal mining system with a rock-blocking device, comprising a plurality of hydraulic supports and a conveyor (2), wherein the conveyor (2) is located below the top beams (11) of the plurality of hydraulic supports in an area away from the columns (12), and the running direction of the conveyor (2) is perpendicular to the length direction of the top beams (11), characterized in that: At least some of the hydraulic supports (1) are hydraulic supports with a rock-blocking device as described in any one of claims 1-7.

9. The coal mining system with a gangue-blocking device as described in claim 8, characterized in that: In the plurality of hydraulic supports, a hydraulic support with a rock-blocking device as described in any one of claims 1-7 is provided every 15-20 hydraulic supports.

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