Working face full-section telescopic gangue blocking support
By designing a full-section telescopic rock-blocking support, a continuous barrier is formed by hydraulically driven top, middle, and bottom guard plates, which solves the problem of rock inrush in the absence of coal pillars and ventilation, thus improving safety and mining efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-21
- Publication Date
- 2026-03-10
AI Technical Summary
Existing rock-blocking devices cannot form a continuous barrier under conditions of no coal pillars and no ventilation, leading to the influx of gravel, occupying a large space, reducing mining efficiency, and having poor adaptability, making them unable to effectively cope with the unique risks of 'L'-shaped working faces.
Design a full-section telescopic rock-blocking support for the working face, including a hydraulic support body and a lateral rock-blocking assembly, which consists of a top guard plate, a middle guard plate and a bottom guard plate. It forms a continuous closed rock-blocking barrier through hydraulic drive, covering the full height and width of the working face, and achieves dynamic response by combining pressure sensors.
It achieves blind-spot-free protection across the entire working face, reduces the amount of gangue entering by 30%, improves operational safety and production continuity, and reduces the intensity of gangue removal operations and equipment wear.
Smart Images
Figure CN121630495A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of coal mine safety support technology, and in particular to a full-section telescopic rock retaining support for the working face. Background Technology
[0002] In the field of mining engineering, especially in coal mining technology, face protection is a crucial aspect of ensuring safe production. Pillarless longwall mining improves resource recovery and reduces mining costs by eliminating the need for pillars separating adjacent faces. However, the pillarless design directly exposes the goaf, making it easy for gravel and residual coal to flow into the longwall face, causing safety hazards and equipment damage. Especially in L-shaped, unventilated longwall faces (i.e., only one transport roadway and one cut-off), the incidence of goaf intrusion accidents increases significantly, severely impacting mining efficiency and worker safety. Currently, common rock-blocking devices, such as fixed baffles or simple hydraulic supports, use rigid protective plates fixed to the outside of the hydraulic support, achieving basic protection through bolted connections. These technologies block gravel through physical barriers but only cover a portion of the cross-section and rely on manual operation for deployment and retraction.
[0003] In the process of developing this invention, the inventors discovered at least the following problems in the existing technology: While these devices can be used with difficulty in conventionally ventilated working faces, their limitations are significant in situations without coal pillars or ventilation. Specifically, existing rock-blocking supports have certain defects, mainly in terms of structural design, spatial adaptability, and functionality. First, incomplete protection is the core issue: existing devices, such as fixed baffles, only cover a partial section of the working face (e.g., the top or bottom), failing to form a continuous barrier, allowing gravel to seep in through gaps. For example, at the tail of the scraper conveyor, the gap between the guard plates of existing supports often reaches 20-30 cm, with measured gravel inflow exceeding 15%, increasing equipment jamming and accident risks. Second, excessive space occupation: traditional supports are quite thick when retracted (usually over 0.5m), occupying the operating space of the coal mining machine, forcing the equipment to frequently maneuver and reducing mining efficiency by more than 30%. This not only prolongs the coal mining cycle time but also increases energy consumption. Third, it has poor adaptability. Under conditions of no ventilation and no coal pillar, the existing supports lack dynamic response mechanisms and compatibility with harsh environments. Specifically, it cannot effectively cope with the unique risks of the "L"-shaped working face, namely, the wide exposed surface on the goaf side and the sudden influx of crushed rock under the action of mine pressure. The static support design of the existing supports cannot adjust the support strength in real time, which leads to an increased risk of rock block failure. Summary of the Invention
[0004] The present invention aims to at least partially solve one of the technical problems in the related art.
[0005] Therefore, the purpose of this invention is to provide a telescopic rock-blocking support for the entire working face, covering the full height and width of the working face and eliminating blind spots in protection.
[0006] To achieve the above objectives, this invention proposes a full-section telescopic rock-blocking support for the working face, comprising: The hydraulic support body includes a base, a top beam, and a rear shield beam. The top beam is located above the base, the top end of the rear shield beam is hinged to the rear end of the top beam, and the bottom end of the rear shield beam is hinged to the rear end of the base. A lateral rock-blocking assembly is located on the goaf side of the hydraulic support body and includes a top guard plate, a middle guard plate, a bottom guard plate, and a first hydraulic mechanism. The top guard plate is located at the side end of the top beam, the bottom guard plate is located at the side end of the base, the middle guard plate is slidably connected to the top guard plate in the vertical direction, and the first hydraulic mechanism is used to drive the middle guard plate to move downward, so that the top guard plate, the middle guard plate, and the bottom guard plate together form a closed rock-blocking barrier.
[0007] According to one embodiment of the present invention, the front end of the top guard plate is flush with the front end of the top beam or extends beyond the front end of the top beam, and the rear end of the top guard plate at least partially overlaps with the rear shield beam.
[0008] According to one embodiment of the present invention, the front end of the middle protective plate is flush with the front end of the top beam or extends beyond the front end of the top beam, and the rear end of the middle protective plate at least partially overlaps with the rear protective beam.
[0009] According to one embodiment of the present invention, it further includes a plurality of fasteners, and the top guard plate is provided with a plurality of mounting holes, the fasteners passing through the mounting holes and connecting to the side end of the top beam.
[0010] According to one embodiment of the present invention, the top guard plate is provided with multiple slide rails arranged in the vertical direction on the side near the hydraulic support body, and the middle guard plate is provided with multiple track grooves adapted to the slide rails on the side near the goaf.
[0011] According to one embodiment of the present invention, the middle guard plate is provided with a plurality of support grooves on the side near the hydraulic support body, the first hydraulic mechanism is a hydraulic cylinder, and there are a plurality of them. One end of the first hydraulic mechanism is hinged to the bottom end of the top beam, and the other end of the first hydraulic mechanism is hinged to the support groove.
[0012] According to one embodiment of the present invention, the bottom protective plate includes multiple sections of housing and a second hydraulic mechanism, wherein the second hydraulic mechanism is disposed within the housing and is used to drive the multiple sections of housing to extend and retract.
[0013] According to one embodiment of the present invention, the top guard plate has a recessed portion on the lower side near the hydraulic support body, and the middle guard plate is slidably disposed in the recessed portion in the vertical direction.
[0014] According to one embodiment of the present invention, when the multiple sections of the housing are fully extended, the end face of the last section of the housing is flush with the end face of the middle protective plate.
[0015] According to one embodiment of the present invention, a plurality of pressure sensors are also included, which are installed on the top guard plate or the middle guard plate for detecting the compressive force of gangue from the goaf side.
[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The telescopic rock-blocking support for the working face according to the present invention, by setting a lateral rock-blocking assembly consisting of a top guard plate, a middle guard plate, and a bottom guard plate on the goaf side of the hydraulic support body, this assembly can be deployed under hydraulic drive to form a continuous, closed rock-blocking barrier from the top plate to the bottom plate, achieving blind-spot-free protection of the entire working face except for the area through which the coal mining machine passes. After adopting the rock-blocking support of the present invention, the amount of rock inflow into the working face is reduced from more than 15% in the traditional structure to less than 10%, a reduction of more than 30%, which significantly reduces the intensity of rock-blocking operations and equipment wear, and improves the operational safety and production continuity of the working face.
[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. Wherein: Figure 1 This is a left view of the side rock-blocking assembly in one embodiment of the present invention, showing the rock-blocking support in an extended state when the rock-blocking support is retracted.
[0019] Figure 2 This is a right view of the side rock-blocking component in one embodiment of the present invention, showing the rock-blocking support in an extended state when the side rock-blocking component is retracted.
[0020] Figure 3 This is a left view of the lateral rock-blocking assembly in an embodiment of the present invention, showing the rock-blocking support in the unfolded state.
[0021] Figure 4 This is a right view of the lateral rock-blocking assembly in an embodiment of the present invention, showing the rock-blocking support in the unfolded state.
[0022] Figure 5 This is a left view of the side rock-blocking assembly in one embodiment of the present invention, showing the rock-blocking bracket in a retracted state.
[0023] Figure 6 This is a right view of the side rock-blocking component in a retracted state according to an embodiment of the present invention.
[0024] Figure 7 This is a front view of the side rock-blocking assembly in one embodiment of the present invention, showing the rock-blocking support in the unfolded state when the side rock-blocking assembly is retracted.
[0025] Figure 8 This is a front view of the rock-blocking support in the unfolded state when the lateral rock-blocking assembly is unfolded, according to an embodiment of the present invention.
[0026] Figure 9 This is a right view of the top guard plate in one embodiment of the present invention.
[0027] Figure 10 This is a left view of the top guard plate in one embodiment of the present invention.
[0028] Figure 11 This is a right view of the protective plate in one embodiment of the present invention.
[0029] Figure 12 This is a left view of the protective plate in one embodiment of the present invention.
[0030] Figure 13 This is a front view of the top guard plate in one embodiment of the present invention.
[0031] Figure 14 This is a front view of the protective plate in one embodiment of the present invention.
[0032] Figure 15 This is a cross-sectional view of the bottom protective plate in an unfolded state according to an embodiment of the present invention.
[0033] Figure 16 This is a cross-sectional view of the bottom guard plate in a retracted state according to an embodiment of the present invention.
[0034] Figure 17 This is a schematic diagram of the working state of the rock-blocking support in one embodiment of the present invention.
[0035] Explanation of reference numerals in the attached figures: 1-Top guard plate, 2-Middle guard plate, 3-Bottom guard plate, 4-First hydraulic mechanism, 5-Mounting hole, 6-Slide rail, 7-Railway groove, 8-Support groove, 9-Fastener, 10-Top beam, 11-Base, 12-Rear shield beam, 31-Box body, 32-Second hydraulic mechanism. Detailed Implementation
[0036] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the invention, and should not be construed as limiting the invention. Rather, embodiments of the invention include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.
[0037] The following is for reference. Figures 1 to 17 This describes a telescopic rock-blocking support with a full cross-section according to an embodiment of the present invention.
[0038] Combination Figures 1 to 8 As shown, the working face full-section telescopic rock-blocking support according to an embodiment of the present invention includes a hydraulic support body and a lateral rock-blocking assembly.
[0039] The hydraulic support body includes a base 11, a top beam 10, and a rear shield beam 12. The top beam 10 is located above the base 11. The top end of the rear shield beam 12 is hinged to the rear end of the top beam 10, and the bottom end of the rear shield beam 12 is hinged to the rear end of the base 11. Specifically, the bottom end of the rear shield beam 12 is hinged to the base 11 via a rear connecting rod, forming a four-bar linkage for stability. Several support columns are provided between the top beam 10 and the base 11. The base 11 is the basic support component of the rock-blocking support. The top beam 10 directly contacts the roof plate to prevent roof collapse and is the most important load-bearing component of the rock-blocking support. The function of the rear shield beam 12 is to prevent rockfall behind it. The middle of the rear shield beam 12 has a hinge point, which allows for attitude adjustment during the raising and lowering of the support columns. When the support columns are raised, the rock-blocking support is in the extended state; conversely, when the support columns are retracted, the rock-blocking support is in the retracted state.
[0040] The lateral rock-blocking assembly is located on the goaf side of the hydraulic support body. Figure 7 The top guard plate 1, middle guard plate 2, bottom guard plate 3, and first hydraulic mechanism 4 are located on the right side of the top beam 10. The top guard plate 1 is located on the side end of the top beam 10, the bottom guard plate 3 is located on the side end of the base 11, the middle guard plate 2 is slidably connected to the top guard plate 1 in the vertical direction, and the first hydraulic mechanism 4 is used to drive the middle guard plate 2 to move downward, so that the top guard plate 1, middle guard plate 2 and bottom guard plate 3 together form a closed rock barrier.
[0041] Both the top guard plate 1 and the middle guard plate 2 adopt a flat plate structure. The top guard plate 1 can be connected to the top beam 10 by welding, detachable connection, or other methods. The top guard plate 1 and the top beam 10 rise and fall synchronously to form the upper area of the rock-blocking barrier, preventing rock from the goaf from entering the working face from the top. The middle guard plate 2, as an adjustable-height intermediate protective layer, extends and retracts vertically under the drive of the first hydraulic mechanism 4, realizing dynamic adjustment of the height of the rock-blocking barrier. The bottom guard plate 3 is the bottom area of the rock-blocking barrier. The top of the bottom guard plate 3 overlaps with the bottom of the middle guard plate 2 to form a sealed protection. The first hydraulic mechanism 4 is used to drive the middle guard plate 2 to move vertically relative to the top guard plate 1, realizing the unfolding and folding of the lateral rock-blocking components.
[0042] According to an embodiment of the present invention, a full-section telescopic rock-blocking support for the working face, by installing a lateral rock-blocking assembly consisting of a top guard plate, a middle guard plate, and a bottom guard plate on the goaf side of the hydraulic support body, can deploy under hydraulic drive to form a continuous, closed rock-blocking barrier from the top plate to the bottom plate, achieving blind-spot-free protection of the entire working face except for the area through which the coal mining machine passes. After adopting the rock-blocking support of the present invention, the amount of rock inflow into the working face is reduced from more than 15% in the traditional structure to less than 10%, a reduction of more than 30%, which significantly reduces the intensity of rock-blocking operations and equipment wear, and improves the operational safety and production continuity of the working face.
[0043] In some embodiments, combined with Figure 1 and Figure 3 As shown, the front end of the top protection plate 1 is flush with or extends beyond the front end of the top beam 10, forming continuous support for the goaf. The rear end of the top protection plate 1 at least partially overlaps with the rear shield beam 12. In other words, the overlapping area covers the hinged area between the top beam 10 and the rear shield beam 12, eliminating structural gaps and blocking the path of gangue from the top hinge into the goaf.
[0044] The front end of the middle protective plate 2 is flush with or extends beyond the front end of the top beam 10, forming continuous support for the goaf. The rear end of the middle protective plate 2 at least partially overlaps with the rear shield beam 12, effectively sealing the connection gap between the middle protective plate 2 and the rear shield beam 12, preventing gangue from the goaf from entering the working face from above, and improving the reliability of the gangue retaining structure.
[0045] The top guard plate 1, middle guard plate 2 and bottom guard plate 3 are all made of high-strength alloy steel, and the surface coating enhances wear resistance.
[0046] In some embodiments, combined with Figure 9 , Figure 10 and Figure 13As shown, it also includes multiple fasteners 9. The top guard plate 1 has multiple mounting holes 5. The fasteners 9 pass through the mounting holes 5 and connect to the side end of the top beam 10. The number of mounting holes 5 is set according to actual needs and is not limited. The type of fastener 9 is set according to actual needs and is not limited. For example, the mounting holes 5 are threaded holes, and the fasteners 9 are bolts. Figure 13 As shown, mounting hole 5 can also be a countersunk hole, which avoids the bolt head protruding and improves flatness.
[0047] Combination Figure 4 and Figure 11 As shown, the top guard plate 1 has multiple slide rails 6 arranged vertically on the side near the hydraulic support body, and the middle guard plate 2 has multiple track grooves 7 adapted to the slide rails 6 on the side near the goaf. The track grooves 7 are slidably connected to the slide rails 6. The number of slide rails 6 and track grooves 7 is the same, and the specific number is set according to actual needs. For example, there are two slide rails 6 and two track grooves 7. The two slide rails 6 are arranged in parallel. The gap between the track grooves 7 and the slide rails 6 is ≤0.5mm to achieve a precise fit.
[0048] Combination Figure 1 , Figure 12 and Figure 14 As shown, the middle guard plate 2 has multiple support grooves 8 on the side near the hydraulic support body. The first hydraulic mechanism 4 is a hydraulic cylinder, and there are multiple of them. One end of the first hydraulic mechanism 4 is hinged to the bottom end of the top beam 10, and the other end of the first hydraulic mechanism 4 is hinged to the support groove 8. The specific connection method is as follows: when the first hydraulic mechanism 4 is a hydraulic cylinder, the cylinder body and the end of the telescopic rod of the hydraulic cylinder have pin holes. Connecting lugs are installed at corresponding positions on the support groove 8 and the top beam 10. The two ends of the hydraulic cylinder are hinged to the connecting lugs through pins.
[0049] In some embodiments, combined with Figure 1 , Figure 15 and Figure 16 As shown, the bottom protective plate 3 includes multiple sections of housing 31 and a second hydraulic mechanism 32. The second hydraulic mechanism 32 is located inside the housing 31 and is used to drive the extension and retraction of the multiple sections of housing 31. The number of housings 31 depends on actual needs; for example, there are 3 sections of housing 31. The second hydraulic mechanism 32 also uses hydraulic cylinders. When the bottom protective plate 3 is in the retracted state, its length is only 0.5m, maximizing space utilization. When the multiple sections of housing 31 are fully extended, the end face of the last housing 31 is flush with the end face of the middle protective plate 2, effectively sealing the gap between the middle protective plate 2 and the bottom protective plate 3, preventing gangue from the goaf from entering the working face.
[0050] Combination Figure 7 and Figure 8As shown, the top guard plate 1 has a recessed portion on its lower side near the hydraulic support body, and the middle guard plate 2 is slidably disposed within the recessed portion in the vertical direction. After the middle guard plate 2 is retracted upwards into the recessed portion, its top end is at least partially accommodated in the recessed portion, thereby reducing the entry of external coal dust and rock fragments into the sliding fit gap, preventing jamming, and simultaneously reducing the overall height of the rock retaining support, improving the convenience of transportation and storage.
[0051] In some embodiments, the full-section telescopic rock-blocking support at the working face also includes multiple pressure sensors mounted on the top guard plate 1 or the middle guard plate 2 to detect the compressive pressure of rock from the goaf side. The pressure sensors, combined with an automatic detection system, respond in real time to the rock pressure. Once the pressure exceeds a set value, the full-section telescopic rock-blocking support immediately deploys, ensuring stable operation in a non-ventilated environment and improving protection efficiency. The automatic detection system has a data acquisition unit and a control unit. The data acquisition unit receives data from the pressure sensors, and the control unit judges the received data. For example, when the detected pressure value exceeds a set threshold, the control unit issues a command to deploy the rock-blocking support.
[0052] like Figure 17 As shown, in this embodiment of the invention, the full-section telescopic rock-blocking support covers the working face in three ways during operation: the top guard plate 1, the middle guard plate 2, and the bottom guard plate 3 work together to cover the working face. The top guard plate 1 protects against falling rocks from the top, the middle guard plate 2 blocks rockfalls from the middle section, and the bottom guard plate 3 prevents coal from flowing in from the bottom, forming a full-section barrier (except for the operating space of the coal cutter). The second hydraulic mechanism 32 drives the multi-section box 31 to telescopically extend, allowing the bottom guard plate 3 to adapt to different working face widths. The extension stroke control of the first hydraulic mechanism 4 ensures the precise displacement of the middle guard plate 2, avoiding jamming. In practical applications, the rock-blocking support is placed outside the tail of the scraper conveyor. Under conditions without coal pillars, it effectively blocks the inflow of coal and rock mass into the goaf, improving the working environment of the working face.
[0053] It should be noted that in the description of this invention, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.
[0054] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0055] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0056] In the description of this invention, the terms "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0057] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0058] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.
Claims
1. A full-face telescopic gangue blocking support for a working face, characterized in that, The hydraulic support body comprises a base (11), a top beam (10) arranged above the base (11), and a rear shield beam (12) with a top end hinged to a rear end of the top beam (10) and a bottom end hinged to a rear end of the base (11). The lateral gangue blocking assembly is arranged on the goaf side of the hydraulic support body and comprises a top guard plate (1), a middle guard plate (2), a bottom guard plate (3), and a first hydraulic mechanism (4). The top guard plate (1) is arranged at a side end of the top beam (10), the bottom guard plate (3) is arranged at a side end of the base (11), the middle guard plate (2) is slidably connected to the top guard plate (1) in the up-down direction, and the first hydraulic mechanism (4) is used to drive the middle guard plate (2) to move downward, so that the top guard plate (1), the middle guard plate (2), and the bottom guard plate (3) jointly form a closed gangue blocking barrier. The front end of the top guard plate (1) is flush with the front end of the top beam (10) or extends beyond the front end of the top beam (10), and the rear end of the top guard plate (1) at least partially overlaps the rear shield beam (12).
2. The full-face telescopic gangue blocking support for working face according to claim 1, characterized in that, The front end of the middle guard plate (2) is flush with the front end of the top beam (10) or extends beyond the front end of the top beam (10), and the rear end of the middle guard plate (2) at least partially overlaps the rear shield beam (12).
3. The full face telescopic gangue blocking support of the working face according to claim 1, characterized in that, A plurality of fasteners (9) are arranged on the top guard plate (1), and the fasteners (9) are connected to the side end of the top beam (10) through the mounting holes (5).
4. The full-face telescopic gangue blocking support for working face according to claim 1, characterized in that, The top guard plate (1) is provided with a plurality of slide rails (6) arranged in the up-down direction on the side close to the hydraulic support body, and the middle guard plate (2) is provided with a plurality of track grooves (7) matched with the slide rails (6) on the side close to the goaf.
5. The full face telescopic gangue blocking support of the working face according to claim 1, characterized in that, The middle guard plate (2) is provided with a plurality of support grooves (8) on the side close to the hydraulic support body, the first hydraulic mechanism (4) is a plurality of hydraulic oil cylinders, one end of the first hydraulic mechanism (4) is hinged to the bottom end of the top beam (10), and the other end of the first hydraulic mechanism (4) is hinged to the support grooves (8).
6. The full face telescopic gangue blocking support of the working face according to claim 1, characterized in that, The bottom guard plate (3) comprises a plurality of box bodies (31) and a second hydraulic mechanism (32), the second hydraulic mechanism (32) is arranged in the box body (31) and used to drive the plurality of box bodies (31) to extend and retract.
7. The full face telescopic gangue blocking support for working face according to claim 1, characterized in that, The top guard plate (1) is provided with a recess on the lower side close to the hydraulic support body, and the middle guard plate (2) is slidably arranged in the recess in the up-down direction.
8. The full face telescopic gangue blocking support of the working face according to claim 1, characterized in that, When the plurality of box bodies (31) are fully extended, the end face of the last box body (31) is flush with the end face of the middle guard plate (2).
9. The full face retractable gangue blocking support for working face according to claim 7, characterized in that, A plurality of pressure sensors are arranged on the top guard plate (1) or the middle guard plate (2) and used to detect the extrusion force of the gangue from the goaf side.
10. The full-face telescopic gangue blocking support for working face according to any one of claims 1 to 9, characterized in that,