Coal wall protecting device

Abstract

The utility model provides a coal wall protecting device. The coal wall protecting device comprises a supporting seat, a supporting rod and a supporting rod, the protective nets extend in the vertical direction, the protective nets are rotatably arranged on the supporting seat, a driving part is arranged between each protective net and the supporting seat, and the protective nets can rotate relative to the supporting seat under the driving of the driving parts; and the baffles are movably arranged on the sides, facing the coal wall, of the protection nets, the baffles are arranged on at least one protection net, and the baffles can move in the vertical direction relative to the protection nets so as to adjust the shielding area of the coal wall protection device on the coal wall in the vertical direction. By means of the technical scheme, the problems that in the prior art, a protection net is small in supporting area and poor in protection effect can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mine production safety, in particular to a coal wall protecting device. Background Art

[0002] During the coal mining process, the triangular coal area of ​​the working face will be greatly affected by the stress changes in the area due to the cutting. The coal wall or rock wall will collapse or collapse under the action of mine pressure, which will cause great safety hazards to the safety of on-site personnel. Temporary coal wall protection devices are usually used on the production site to support the coal wall in the triangular coal area.

[0003] In traditional technical solutions, a protective net is usually used to support the coal wall. The protective net is made of multiple square rods welded together and installed at the top of the coal wall in the triangular coal area. In order not to affect the mining work in the triangular coal area, the protective net is usually set small and used in conjunction with a hydraulic column. The height of the protective net is adjusted by the hydraulic column so that the protective net can cooperate with the top of the coal wall in the triangular coal area to support the top of the coal wall and prevent the coal wall from collapsing from above. However, when the coal wall in the triangular coal area collapses, especially when a spalling accident occurs, the coal wall below the triangular coal area will also collapse. The existing protective net has a small support area and the protection effect is poor. Utility Model Content

[0004] The utility model provides a coal wall supporting device to solve the problems in the prior art of small supporting area of ​​the protective net and poor protective effect.

[0005] The utility model provides a coal wall protection device, which includes: a support seat; a protective net, which extends in a vertical direction and is rotatably arranged on the support seat, and two protective nets are provided. A driving member is provided between each protective net and the support seat, and the protective net can rotate relative to the support seat under the drive of the driving member; a baffle, which is movably arranged on a side of the protective net facing the coal wall, and at least one protective net is provided with a baffle, which can move in a vertical direction relative to the protective net to adjust the shielding area of ​​the coal wall by the coal wall protection device in the vertical direction.

[0006] Furthermore, a guide rail extending in a vertical direction is provided on the guard net, and a guide piece is provided on the baffle. The baffle cooperates with the guide rail through the guide piece to guide the movement of the baffle.

[0007] Furthermore, the guide member includes two sliders arranged opposite to each other in the horizontal direction, the sliders are provided with protrusions, the protrusions of the two sliders are arranged opposite to each other, and two guide grooves extending in the vertical direction are arranged opposite to each other on the side walls of the guide rail, and the protrusions are movably arranged in the guide grooves.

[0008] Furthermore, a snap-fit ​​groove is provided on the side wall of the guide groove close to the baffle side, and the snap-fit ​​groove extends in the horizontal direction. A snap-fit ​​protrusion is provided on one side of the protrusion corresponding to the snap-fit ​​groove. The snap-fit ​​protrusion is movably provided in the snap-fit ​​groove to limit the displacement of the guide member relative to the guide rail. The width of the guide groove is smaller than the thickness of the snap-fit ​​protrusion.

[0009] Furthermore, an extrusion block and an elastic member are provided between the guide member and the guide rail. The extrusion block is provided between the two sliders and abuts against the guide rail. The elastic member is provided between the extrusion block and the baffle. The elastic member is used to provide an elastic force to the extrusion block to move toward the guide rail.

[0010] Furthermore, a plurality of rollers are provided on the end surface of the extrusion block facing the guide rail.

[0011] Furthermore, a plurality of barrier rods are provided on a side of the baffle away from the guard net, the barrier rods extend in a horizontal direction, and the plurality of barrier rods are arranged at intervals in a vertical direction.

[0012] Furthermore, the support seat has a column, the protective net is hingedly connected to the column, and the driving part includes a telescopic rod, one telescopic end of the telescopic rod is hinged to the column, and the other telescopic end of the telescopic rod is hinged to the side of the protective net away from the baffle. The two telescopic ends of the telescopic rod can be relatively close to or relatively far away from each other to drive the protective net to rotate relative to the column.

[0013] Furthermore, the support seat also includes a telescopic column, and the upright column is fixedly arranged at the telescopic end of the telescopic column to adjust the height of the protective net.

[0014] Furthermore, a first folding arm and a second folding arm hinged to each other are provided between the telescopic column and the column. The first folding arm and the second folding arm extend in a horizontal direction. The end of the first folding arm away from the second folding arm is hinged to the telescopic column, and the end of the second folding arm away from the first folding arm is fixedly provided with the column. A first hydraulic cylinder is provided between the first folding arm and the telescopic column to adjust the angle between the first folding arm and the column, and a second hydraulic cylinder is provided between the second folding arm and the first folding arm to adjust the angle between the second folding arm and the first folding arm.

[0015] The technical solution of the present invention is applied to support a seat, a guard net and a baffle. The two guard nets can rotate relative to each other under the drive of a driving member to adjust the angle between the two guard nets, so that the coal wall side protection device provided by the present application can adapt to coal walls with different surface shapes, so that the guard net can be close to the coal wall, thereby improving the protective effect of the coal wall side protection device. In addition, a baffle is provided on the guard net. When the coal wall below the triangular coal area collapses, the baffle can be moved vertically toward the bottom of the guard net to supplement the shielding area of ​​the baffle guard net, shield the coal wall below the guard net, increase the support area of ​​the coal wall side protection device, and reduce the probability of coal mine safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 The figure shows the structural diagram of the coal wall protection device provided by the utility model;

[0018] Figure 2 Shows a schematic structural diagram of the baffle provided by the utility model;

[0019] Figure 3 Shows a schematic structural diagram of the guide member provided by the utility model;

[0020] Figure 4 Shows a schematic structural diagram of the guide rail provided by the utility model;

[0021] Figure 5 Shows a cross-sectional view of the guide rail provided by the utility model;

[0022] Figure 6 The figure shows a structural schematic diagram of the extrusion block provided by the utility model.

[0023] The above drawings include the following reference numerals:

[0024] 100, support seat;

[0025] 110, upright column; 111, telescopic rod; 120, telescopic column; 130, first folding arm; 140, second folding arm;

[0026] 200, protective net;

[0027] 210, guide rail; 211, guide groove; 212, snap-fit ​​groove;

[0028] 220, dust shield;

[0029] 300, baffle;

[0030] 310, guide member; 311, slider; 312, protrusion; 313, clamping protrusion; 314, extrusion block; 315, elastic member; 316, roller; 317, sleeve; 318, connecting block; 319, fixing block;

[0031] 320, gear lever;

[0032] 330. Weight reduction hole. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] like Figure 1 As shown, an embodiment of the present invention provides a coal wall protection device, which includes: a support base 100, a protective net 200, and a baffle 300. The protective net 200 extends in the vertical direction and is rotatably disposed on the support base 100. Two protective nets 200 are provided, and a driving member is provided between each protective net 200 and the support base 100. The protective net 200 can rotate relative to the support base 100 under the drive of the driving member. The baffle 300 is movably provided on the side of the protective net 200 facing the coal wall. At least one protective net 200 is provided with a baffle 300. The baffle 300 can move in the vertical direction relative to the protective net 200 to adjust the vertical shielding area of ​​the coal wall by the coal wall protection device.

[0035] The technical solution of the present invention is applied, including a support seat 100, a protective net 200 and a baffle 300. The two protective nets 200 can rotate relative to each other under the drive of a driving member to adjust the angle between the two protective nets 200, so that the coal wall protection device provided by the present application can adapt to coal walls with different surface shapes, so that the protective nets 200 can be close to the coal wall, thereby improving the protective effect of the coal wall protection device. In addition, a baffle 300 is provided on the protective net 200. When the coal wall below the triangular coal area collapses, the baffle 300 can be moved vertically toward the bottom of the protective net 200 to supplement the shielding area of ​​the baffle protective net 200, shield the coal wall below the protective net 200, increase the support area of ​​the coal wall protection device, and reduce the probability of coal mine safety accidents.

[0036] Specifically in this application, baffles 300 can be provided on both protective nets 200 to maximize the shielding area of ​​the coal wall protection device; or a baffle 300 can be provided on one of the protective nets 200 to selectively protect a certain coal wall.

[0037] Specifically, the support base 100 includes a column 110, and the protective net 200 is hingedly connected to the column 110. The driving member includes a telescopic rod 111. One telescopic end of the telescopic rod 111 is hingedly connected to the column 110, and the other telescopic end of the telescopic rod 111 is hingedly connected to the side of the protective net 200 facing away from the baffle 300. The two telescopic ends of the telescopic rod 111 can be moved relatively close to or relatively apart to drive the protective net 200 to rotate relative to the column 110. With this arrangement, the protective net 200 can be rotated by adjusting the distance between the two telescopic ends of the telescopic rod 111. Specifically, the telescopic rod 111 can be a hydraulic rod or an electro-hydraulic push rod.

[0038] In the present application, the width of the baffle 300 can be equal to or less than the width of the protective net 200. When the width of one of the baffles 300 is equal to the width of the protective net 200, the minimum angle between the two protective nets 200 is 90°. When the width of both baffles 300 is less than the width of the protective net 200, the minimum angle between the two protective nets 200 can be less than 90°.

[0039] Specifically, a pivot can be provided on the side wall of the column 110 , and the guard net 200 is hinged to the pivot, thereby reducing the distance between the two guard nets 200 and preventing small coal blocks from falling from the gap between the two guard nets 200 .

[0040] Furthermore, the support base 100 also includes a telescopic column 120, and the column 110 is fixedly mounted at the telescopic end of the telescopic column 120 to adjust the height of the protective net 200. Through this arrangement, the protective net 200 fixed to the column 110 can be adjusted in height by the telescopic column 120, so that the protective net 200 can support coal walls at different heights, meeting the support requirements of working surfaces at different heights.

[0041] Specifically, the telescopic column 120 may be a hydraulic column.

[0042] Furthermore, a first folding arm 130 and a second folding arm 140 hinged to each other are provided between the telescopic column 120 and the column 110. The first folding arm 130 and the second folding arm 140 extend in the horizontal direction. The end of the first folding arm 130 away from the second folding arm 140 is hinged to the telescopic column 120, and the end of the second folding arm 140 away from the first folding arm 130 is fixedly provided with the column 110. A first hydraulic cylinder is provided between the first folding arm 130 and the telescopic column 120 to adjust the angle between the first folding arm 130 and the column 110, and a second hydraulic cylinder is provided between the second folding arm 140 and the first folding arm 130 to adjust the angle between the second folding arm 140 and the first folding arm 130. The present invention can adjust the angle between the first folding arm 130 and the telescopic column 120 by using a first hydraulic cylinder; and adjust the angle between the second folding arm 140 and the first folding arm 130 by adjusting a second hydraulic cylinder, so as to flexibly adjust the orientation of the protective net 200. The working space underground is relatively small. By providing the first folding arm 130 and the second folding arm 140, the present invention can improve the use effect of the coal wall protection device. Furthermore, the first folding arm 130 and the second folding arm 140 can be rotated relative to each other until they are parallel to each other, thereby reducing the overall space occupied by the coal wall protection device and facilitating its transportation and movement.

[0043] Specifically, a plurality of weight-reducing holes 330 may be provided on the baffle 300 to reduce the overall weight of the baffle 300 , thereby further facilitating the transportation of the coal wall protection device.

[0044] like Figure 2 As shown, the guard net 200 is provided with a guide rail 210 extending in a vertical direction, and the baffle 300 is provided with a guide member 310. The baffle 300 cooperates with the guide rail 210 through the guide member 310 to guide the movement of the baffle 300. Through the above arrangement, the guide member 310 can guide the movement of the baffle 300, ensure the movement direction of the baffle 300, and enable the baffle 300 to move accurately below the guard net 200.

[0045] Specifically, a plurality of guide rails 210 may be provided at intervals in the width direction of the protective net 200 to improve the guiding effect on the baffle 300 .

[0046] Furthermore, a plurality of guide members 310 may be arranged at intervals along the extension direction of the guide rail 210 , and each guide rail 210 is provided with a plurality of guide members 310 .

[0047] In a specific embodiment of the present application, refer to Figure 3As shown, the guide member 310 includes two horizontally opposed sliders 311, a connecting block 318, and two fixed blocks 319. The fixed blocks 319 are fixedly connected to the baffle 300. The connecting block 318 is disposed between the two fixed blocks 319. The two sliders 311 are disposed on the connecting block 318, and the fixed blocks 319 and the connecting block 318 provide support for the sliders 311. The sliders 311 are provided with protrusions 312, and the protrusions 312 of the two sliders 311 are disposed opposite each other. Two vertically extending guide slots 211 are disposed opposite each other on the sidewalls of the guide rail 210, and the protrusions 312 are movably disposed within the guide slots 211. Through this arrangement, the guide slots 211 can cooperate with the protrusions 312 to guide the baffle 300. The provision of two guide slots 211 can thus limit the horizontal shaking of the baffle 300 relative to the guard net 200, ensuring the stability of the movement of the baffle 300.

[0048] Specifically, both ends of the guide groove 211 do not penetrate the guide rail 210 . In this configuration, the movement range of the protrusion 312 can be limited by the end surfaces of the guide groove 211 .

[0049] Further, refer to Figure 3 and Figure 4 As shown, a snap-fit ​​groove 212 is provided on the side wall of the guide groove 211 close to the baffle 300, and the snap-fit ​​groove 212 extends in the horizontal direction. A snap-fit ​​protrusion 313 is provided on one side of the protrusion 312 corresponding to the snap-fit ​​groove 212, and the snap-fit ​​protrusion 313 is movably provided in the snap-fit ​​groove 212 to limit the displacement of the guide member 310 relative to the guide rail 210. The width of the guide groove 211 is smaller than the thickness of the snap-fit ​​protrusion 313. The baffle 300 has a clamping state and a moving state relative to the protective net 200. When the clamping protrusion 313 is located in the clamping groove 212, the baffle 300 is in the clamping state, and the baffle 300 can be fixed on the guide rail 210 through the clamping protrusion 313 and the clamping groove 212; when the coal wall slides, the falling coal blocks can hit the baffle 300, causing the baffle 300 to move toward the protective net 200. At this time, the protrusion 312 can move in the guide groove 211 along the width direction of the guide groove 211, driving the clamping protrusion 313 to move in the direction away from the clamping groove 212. The protrusion 312 is not limited by the clamping groove 212 and can move in the clamping groove 212. At this time, the baffle 300 is in a moving state. In the present application, by setting a snap-fit ​​protrusion 313 to cooperate with the snap-fit ​​groove 212, when the coal wall collapse does not occur, the baffle 300 can be in a snap-fit ​​state, which facilitates the movement and installation of the coal wall protection net device; when the coal wall collapse occurs, the baffle 300 can automatically fall down due to the impact of the coal blocks, so as to increase the shielding area of ​​the coal wall protection net device and improve the protection effect.

[0050] Specific as Figure 5As shown, the two side walls of the clamping protrusion 313 facing each other in the vertical direction and the two inner walls of the clamping groove 212 facing each other in the vertical direction are both provided with guiding inclined surfaces, so that the clamping protrusion 313 can be moved out of the clamping groove 212 after the baffle 300 is impacted by the coal block.

[0051] Furthermore, an extrusion block 314 and an elastic member 315 are disposed between the guide member 310 and the guide rail 210. The extrusion block 314 is disposed between the two sliders 311 and abuts the guide rail 210. The elastic member 315 is disposed between the extrusion block 314 and the baffle 300. The elastic member 315 is configured to provide an elastic force to the extrusion block 314, causing it to move toward the guide rail 210. Through this arrangement, the elastic force of the elastic member 315 can drive the baffle 300 away from the guard net 200, allowing the engaging protrusion 313 to be stably fixed within the engaging groove 212. This maintains the stability of the baffle 300 in the engaged state and prevents the engaging protrusion 313 from accidentally disengaging from the engaging groove 212 after the baffle 300 is subjected to only minor impact or shaking.

[0052] In some optional embodiments of the present application, refer to Figure 6 As shown, the guide member 310 also includes a sleeve 317, which is fixedly arranged on the connecting block 318. The elastic member 315 is a spring, which is arranged in the sleeve 317. A connecting rod is provided on the side of the extrusion block 314 away from the protective net 200. The end of the connecting rod away from the extrusion block 314 has a ring-shaped boss, which is movably arranged in the sleeve 317. The boss abuts against the spring to provide an elastic force for the extrusion block 314 to move toward the guide rail 210.

[0053] Furthermore, a plurality of rollers 316 are provided on the end surface of the extrusion block 314 facing the guide rail 210. Through the above arrangement, the rollers 316 can reduce the friction between the extrusion block 314 and the guide rail 210 when the baffle 300 moves, thereby facilitating the movement of the baffle 300.

[0054] Specifically, a plurality of baffles 320 are provided on the side of the baffle 300 away from the protective net 200. The baffles 320 extend horizontally and are spaced vertically. The baffles 320 are positioned so that when a coal wall collapses, large lumps of coal impact the baffles 320, increasing the driving force for the baffle 300 to move toward the protective net 200 and allowing the baffle 300 to descend more quickly.

[0055] Furthermore, the blocking rod 320 may be composed of a plurality of fixed plates arranged in a stepped manner, and the area of ​​the upper fixed plate is smaller than the area of ​​the lower fixed plate.

[0056] In this application, a dust shield 220 can be fixedly installed at the top of the guide rail 210 to block impurities such as fine coal gangue and coal ash falling from the top plate of the working surface, reduce the impact of impurities on the cooperation between the guide member 310 and the guide rail 210, and ensure the smooth sliding of the baffle 300.

[0057] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0058] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0059] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0060] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0061] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0062] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A coal wall protection device, characterized in that: The coal wall protection device comprises: Support seat (100); A protective net (200) extends in a vertical direction and is rotatably disposed on the support base (100). Two protective nets (200) are provided, and a driving member is provided between each protective net (200) and the support base (100). The protective net (200) can rotate relative to the support base (100) under the drive of the driving member. A baffle (300) is movably arranged on a side of the protective net (200) facing the coal wall. The baffle (300) is arranged on at least one of the protective nets (200). The baffle (300) can move in a vertical direction relative to the protective net (200) to adjust the shielding area of ​​the coal wall by the coal wall protection device in the vertical direction.

2. The coal wall protection device according to claim 1, characterized in that: The guard net (200) is provided with a guide rail (210) extending in a vertical direction, and the baffle (300) is provided with a guide member (310). The baffle (300) is guided and matched with the guide rail (210) through the guide member (310) to guide the movement of the baffle (300).

3. The coal wall protection device according to claim 2, characterized in that: The guide member (310) comprises two sliders (311) arranged opposite to each other in a horizontal direction, the sliders (311) are provided with protrusions (312), the protrusions (312) of the two sliders (311) are arranged opposite to each other, and two guide grooves (211) extending in a vertical direction are arranged opposite to each other on the side walls of the guide rail (210), and the protrusions (312) are movably arranged in the guide grooves (211).

4. The coal wall protection device according to claim 3, characterized in that: A clamping groove (212) is provided on the side wall of the guide groove (211) close to the baffle (300), and the clamping groove (212) extends in the horizontal direction. A clamping protrusion (313) is provided on the side of the protrusion (312) corresponding to the clamping groove (212). The clamping protrusion (313) is movably provided in the clamping groove (212) to limit the displacement of the guide member (310) relative to the guide rail (210). The width of the guide groove (211) is smaller than the thickness of the clamping protrusion (313).

5. The coal wall protection device according to claim 4, characterized in that: An extrusion block (314) and an elastic member (315) are further provided between the guide member (310) and the guide rail (210); the extrusion block (314) is provided between two sliders (311) and abuts against the guide rail (210); the elastic member (315) is provided between the extrusion block (314) and the baffle (300); the elastic member (315) is used to provide an elastic force to the extrusion block (314) to move toward the guide rail (210).

6. The coal wall protection device according to claim 5, characterized in that: A plurality of rollers (316) are provided on the end surface of the extrusion block (314) facing the guide rail (210).

7. The coal wall protection device according to claim 4, characterized in that: A plurality of blocking rods (320) are provided on a side of the blocking plate (300) away from the protective net (200), the blocking rods (320) extend in a horizontal direction, and the plurality of blocking rods (320) are spaced apart in a vertical direction.

8. The coal wall protection device according to claim 1, characterized in that: The support seat (100) has a column (110), the protective net (200) is hingedly connected to the column (110), and the driving member includes a telescopic rod (111), one telescopic end of the telescopic rod (111) is hingedly connected to the column (110), and the other telescopic end of the telescopic rod (111) is hingedly connected to a side of the protective net (200) away from the baffle (300), and the two telescopic ends of the telescopic rod (111) can be relatively close to or relatively far away from each other to drive the protective net (200) to rotate relative to the column (110).

9. The coal wall protection device according to claim 8, characterized in that: The support base (100) further comprises a telescopic column (120), and the upright column (110) is fixedly arranged at the telescopic end of the telescopic column (120) to adjust the height of the protective net (200).

10. The coal wall protection device according to claim 9, characterized in that: A first folding arm (130) and a second folding arm (140) hinged to each other are further provided between the telescopic column (120) and the column (110). The first folding arm (130) and the second folding arm (140) extend in a horizontal direction. An end of the first folding arm (130) away from the second folding arm (140) is hinged to the telescopic column (120). An end of the second folding arm (140) away from the first folding arm (130) is fixedly provided with the column (110). A first hydraulic cylinder is provided between the first folding arm (130) and the telescopic column (120) to adjust the angle between the first folding arm (130) and the column (110). A second hydraulic cylinder is provided between the second folding arm (140) and the first folding arm (130) to adjust the angle between the second folding arm (140) and the first folding arm (130).

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