A supporting device for coal mine roadway surrounding rock

Abstract

The application provides a supporting device for surrounding rock of a coal mine tunnel, comprising: a support body; a force bearing plate assembly comprising a first support plate and a second support plate, a first buffer unit is arranged between the first support plate and the support body, and a second buffer unit is arranged between the first support plate and the second support plate, the first buffer unit is used for providing a buffer force along the height direction of the tunnel to the first support plate and the support body, and the second buffer unit is used for providing a buffer force along a plane perpendicular to the height direction of the tunnel to the first support plate and the second support plate; through the arrangement, the first buffer unit and the second buffer unit can buffer and filter the tiny vibration shock waves generated in the mining process of the coal mine, so that the probability of structural damage of the rigid support body and the first support plate and the second support plate is reduced, and the safety of the support is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mine roadway surrounding rock reinforcement, and particularly relates to a supporting device for coal mine roadway surrounding rock. BACKGROUND

[0002] In the process of coal mining, due to the complexity and variability of surrounding rock conditions, coal mines in China mainly adopt underground mining, and a large number of roadways need to be excavated underground. In order to ensure the smoothness of the roadway and the stability of the surrounding rock, supporting is generally adopted to ensure the smoothness of the roadway. The basic purpose of supporting the roadway is to alleviate and reduce the movement of the surrounding rock, so that the cross section of the roadway does not become too small, and at the same time, prevent the surrounding rock from falling off and being damaged.

[0003] At present, in the process of supporting the roadway, rigid support frames or anchor columns are usually arranged on the sidewall of the roadway to reinforce the surrounding rock of the roadway. These reinforcement methods are mostly hard support. However, in the process of coal mining, small vibration shock waves are generated. The bearing capacity of most roadway support systems can meet the support needs. However, after the surrounding rock is subjected to the action of small vibration shock and gravity for a long time, the rigid support frame or anchor column of the surrounding rock of the roadway is easily structurally damaged, and there is a certain safety hazard. SUMMARY

[0004] In view of the above problems, the present application provides a supporting device for coal mine roadway surrounding rock, which is used for supporting the coal mine roadway surrounding rock, has a buffering support effect, can buffer and absorb part of the shock waves generated in the process of mining, reduces the probability of structural damage of the supporting device, improves the supporting effect, and reduces the safety hazard.

[0005] The present application provides a supporting device for coal mine roadway surrounding rock, comprising:

[0006] a support body;

[0007] a force bearing plate assembly arranged above the support body, comprising a first support plate and a second support plate arranged in the height direction of the roadway, the first support plate and the support body are provided with a first buffer unit, the first support plate and the second support plate are provided with a second buffer unit, the first buffer unit is used for providing a buffering force in the height direction of the roadway to the first support plate and the support body, and the second buffer unit is used for providing a horizontal buffering force to the first support plate and the second support plate.

[0008] Further, the first buffering unit comprises a plurality of first buffering components, each of which comprises a first piston cavity arranged on one of the support body and the first support plate and extending along the height direction of the roadway, a first piston rod arranged in the first piston cavity, and a first buffering body arranged between the first piston rod and the first piston cavity. Specifically, when an impact wave along the height direction of the roadway is generated, the first buffering unit can be compressed to move the first piston rod in the first piston cavity, thereby compressing the first buffering body, which can filter the vibration impact wave along the height direction of the roadway.

[0009] Further, the second buffering unit comprises a plurality of second buffering components arranged between the first support plate and the second support plate, each of which comprises a first support body arranged on one of the first support plate and the second support plate, at least one second support body arranged on the other of the first support plate and the second support plate and surrounding the first support body, and a second buffering member arranged between the first support body and the second support body. Specifically, when a vibration impact wave in the horizontal direction is generated, the second support plate in contact with the roof of the roadway and the first support plate in contact with the floor of the roadway can move slightly in the horizontal direction, thereby compressing or stretching the second buffering member between the first support body and the second support body, so as to filter the impact wave through the deformation of the second buffering member.

[0010] Further, the second buffering component comprises four first support bodies arranged at the four corners of the first support plate, and three second support bodies arranged around each first support body at an angle of 90 degrees. Specifically, the first support bodies can provide support in the height direction of the roadway, and the three second support bodies around each first support body can be arranged in mutually perpendicular directions in the horizontal plane, thereby ensuring that the second buffering member can be compressed or stretched in all directions.

[0011] Further, the first support plate is provided with a cavity, which is in communication with the first piston cavity and the second piston cavity, and the first buffering body and the second buffering body each comprise a flow medium filled in the cavity.

[0012] Further, the cavity is communicated with a constant pressure cavity, which can provide the flowing medium with a constant pressure range to the cavity.

[0013] Further, the first buffer body further comprises a first compression spring arranged between the first piston cavity and the first piston rod.

[0014] Further, the cavity is provided with a flow outlet, the flow outlet is connected with a recovery cavity through a communication channel, and an adjusting valve is arranged on the communication channel, which is used to open when the pressure of the flowing medium in the cavity is instantaneously increased.

[0015] Further, a pump body is arranged between the constant pressure cavity and the recovery cavity, which is used to pump the flowing medium in the recovery cavity into the constant pressure cavity.

[0016] Advantages

[0017] The application provides a supporting device for surrounding rock of a coal mine tunnel, which comprises a supporting body, a force bearing plate assembly arranged above the supporting body, a first supporting plate and a second supporting plate arranged in a tunnel height direction from bottom to top, a first buffer unit arranged between the first supporting plate and the supporting body, a second buffer unit arranged between the first supporting plate and the second supporting plate, the first buffer unit is used to provide a buffer force in the tunnel height direction to the first supporting plate and the supporting body, and the second buffer unit is used to provide a buffer force in a plane perpendicular to the tunnel height direction to the first supporting plate and the second supporting plate. Through the arrangement, the upper end of the supporting body can provide a supporting force for the force bearing plate assembly, the lower end of the supporting body supports the bottom surface of the tunnel, the force bearing plate assembly supports the upper part of the tunnel, the tunnel is supported, and the first buffer unit and the second buffer unit can buffer and filter the small vibration shock waves generated in the mining process of the coal mine, so that the probability of structural damage of the rigid supporting body and the first supporting plate and the second supporting plate is reduced, and the safety of the support is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Other characteristics, objects and advantages of the application will become more apparent from the following detailed description of non-restrictive embodiments, made with reference to the attached drawings.

[0019] Figure 1 A structure schematic view of the supporting device for surrounding rock of a coal mine tunnel provided by the application is arranged in a tunnel.

[0020] Figure 2 A structure schematic view of the supporting device for surrounding rock of a coal mine tunnel provided by the application is arranged in a tunnel. Figure 1 A sectional structure schematic view of the supporting device for surrounding rock of a coal mine tunnel provided by the application is arranged at A-A.

[0021] Figure 3 As shown in Figure 1 A cross-sectional structure schematic view of B-B in a supporting device for surrounding rock of a coal mine tunnel provided by the present application is shown.

[0022] Figure 4 As shown in Figure 3 A local enlarged structure schematic view of C in a supporting device for surrounding rock of a coal mine tunnel provided by the present application is shown.

[0023] Figure 5 As shown in Figure 4 A local enlarged structure schematic view of D in a supporting device for surrounding rock of a coal mine tunnel provided by the present application is shown.

[0024] Figure 6 A structure schematic view of an upper surface of a first supporting plate in a supporting device for surrounding rock of a coal mine tunnel provided by the present application is shown.

[0025] Figure 7 A structure schematic view of a pump body and a constant pressure cavity in a supporting device for surrounding rock of a coal mine tunnel provided by the present application is shown.

[0026] Figure 8 A top view structure schematic view of a pump body, a second pump body, and a constant pressure cavity, a buffer cavity in a supporting device for surrounding rock of a coal mine tunnel provided by the present application is shown.

[0027] Figure 9 A principle structure schematic view of a supporting device for surrounding rock of a coal mine tunnel provided by the present application is shown.

[0028] Figure 10 A structure schematic view of a control valve in a supporting device for surrounding rock of a coal mine tunnel provided by the present application is shown. DETAILED DESCRIPTION

[0029] The present application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related application, and are not a limitation on the application. In addition, it should be noted that only the parts related to the application are shown in the drawings for ease of description.

[0030] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0031] The present application provides a supporting device for surrounding rock of a coal mine tunnel, referring to Figures 1-6 , as a specific embodiment, which comprises:

[0032] a supporting body 1;

[0033] The load-bearing plate assembly 2 is disposed above the support body and includes a first support plate 21 and a second support plate 22 spaced apart from bottom to top along the height direction of the tunnel. A first buffer unit 23 is disposed between the first support plate and the support body 1, and a second buffer unit 24 is disposed between the first support plate 21 and the second support plate 22. The first buffer unit 23 is used to provide buffering force to the first support plate 21 and the support body 1 along the height direction of the tunnel, and the second buffer unit 24 is used to provide buffering force to the first support plate and the second support plate in the horizontal direction.

[0034] For details, please refer to Figure 1 , Figure 2 This is a schematic diagram of the structure of the support device provided in this application installed in a roadway. The support devices are spaced apart along the extension direction of the roadway, thus providing continuous support. The support device provided in this application is mainly used in transport roadways, which are primarily roadways equipped with conveyor belts or other conveying devices. As a specific implementation, the support body 1 in the support device provided in this application is a support column, support wall, or other structure. Its main function is to provide support between the bottom of the roadway and the load-bearing plate assembly 2. The first support plate 21 and the second support plate 22 are both rigid plates and can be configured according to the structure of the roadway's top surface, for example, as flat plates, curved plates, etc. Its function is to provide support for the top of the roadway. The first buffer unit connects the support body 1 and the first support plate, and mainly provides support for the first support plate. During coal mining or when a minor earthquake occurs, the first buffer unit can buffer and filter the shock wave along the height of the roadway, and the second buffer unit can buffer and filter the shock wave along the plane perpendicular to the height of the roadway. This reduces the damage of the shock wave to the support device, thereby reducing the probability of structural damage to the rigid support body and the first and second support plates, and improving the safety of the support. The specific structure and connection method of the first and second buffer units are described below.

[0035] Furthermore, as a specific implementation, the first buffer unit 23 includes a plurality of first buffer components 23a. The first buffer component 23a includes a first piston cavity 230 disposed on one of the support body 1 and the first support plate 21, a first piston rod 231 guided and disposed in the first piston cavity 230, and a first buffer body 232 disposed between the first piston rod and the first piston cavity.

[0036] Specific, exemplary, reference Figures 1-4 , Figure 6, the first piston cavity is arranged on the lower surface of the first support plate, the lower end of the first piston rod 231 is supported and connected with the upper end surface of the support body, the first buffer body 232 is arranged in the first piston cavity, the first buffer body provides support force for the first piston rod, thereby supporting the first support plate, and when the shock wave is received, the first buffer body 232 can be compressed, thereby achieving the effect of buffering and filtering vibration, wherein the first buffer body 232 can be an elastic member capable of supporting in the prior art, and as a specific embodiment, the first buffer body includes but is not limited to a first compression spring 232a, and the first buffer body can further include a compressible flow medium filled in the first piston cavity.

[0037] Further, as a preferred embodiment, referring to Figure 4 , the cylindrical cavity 11 is arranged on the top surface of the support body 1 and is guided and slidably inserted with the side wall of the first piston cavity, when the first buffer body is in a free state without being compressed, the first piston cavity is inserted into the inside of the cylindrical cavity 11, by this arrangement, on the one hand, the first piston cavity can be radially limited by the cylindrical cavity, avoiding the sliding of the support body and the first support plate, on the other hand, when filtering the shock wave, the sliding friction between the outer side wall of the first piston cavity and the side wall of the cylindrical cavity can achieve better filtering effect.

[0038] Further, as a specific embodiment, the second buffer unit 24 includes a plurality of second buffer assemblies 24a uniformly arranged between the first support plate 21 and the second support plate 22, the second buffer assembly 24a includes a first support body 241 arranged on one of the first support plate 21 and the second support plate 22, at least one second support body 242 arranged on the other of the first support plate 21 and the second support plate 22 and surrounding the first support body 241, and a second buffer member 243 arranged between the first support body 241 and the second support body.

[0039] Specifically, referring to Figures 1-6 , as a specific embodiment, the first support body 241 is arranged on the lower surface of the second support plate, the second support body is arranged on the upper surface of the first support plate, and the upper end of the second support body is slidably supported and matched with the lower surface of the second support plate, the second buffer member is arranged between the side surface of the first support body and the side surface of the second support body, when the shock wave in any direction perpendicular to the height direction of the roadway is generated, the first support plate and the second support plate can be displaced in the direction of the plate surface, thereby the second buffer member 243 can be extruded to deform the second buffer member, thereby buffering and filtering the shock wave through the second buffer member, reducing the damage of the shock wave to the support device.

[0040] Further, continuing to refer toFigures 3-6 As a specific embodiment, the second buffering assembly 24a includes four second buffering assemblies arranged at the four corners of the first support plate 21. Each of the first support bodies 241 is provided with three second support bodies arranged at an interval of 90 degrees. Each of the first support body and the second support body is provided with a second buffering member 243. Referring to Figure 6 As a preferred embodiment, the relative position relationship between the second support body and the first support body is shown in the figure. Along the extension direction of the roadway, each two second buffering assemblies are arranged in pairs. Each pair of second buffering assemblies includes two second support bodies arranged on both sides of the first support body along the extension direction of the roadway and one second support body arranged close to the middle region of the first support plate. Through this arrangement, better vibration filtering effect can be achieved.

[0041] Further, the second buffering member 243 includes a second piston cavity 2431 arranged horizontally along the axis, a second piston rod 2432 arranged in the second piston cavity, and a second buffering body 2433 arranged in the second piston cavity. The axis of each of the three first piston cavities arranged around the first support body is arranged along the length direction or the width direction of the roadway.

[0042] Specifically, referring to Figure 4 、 Figure 5 As a specific embodiment, the second buffering member 243 is arranged on the second support body. The specific structure of the second buffering member is as follows: a second piston cavity 2431 arranged on the second support body, a second piston rod 2432 arranged in the second piston cavity, and a second buffering body 2433 arranged between the second piston rod and the second piston cavity. The end of the second piston rod is in contact with the first support body. When the shock wave occurs, the displacement occurs between the first support body and the second support body, thereby extruding the first piston rod of part of the second buffering member 243 to extrude the second buffering body 2433. The second buffering body 2433 filters the buffering agent. The second buffering body can also be selected from elastic members such as compression springs.

[0043] Further, as a preferred embodiment, referring to Figure 4The first support plate 21 is provided with a cavity 210, which is in communication with the first piston cavity and the second piston cavity, and the first buffer body 212 and the second buffer body 2433 each comprise a flow medium filled in the cavity. Specifically, the first piston cavity and the second piston cavity are both in communication with the cavity 210, and the cavity 210 is filled with the flow medium, so that when the first piston rod and / or the second piston rod is pressed, the flow medium in the first piston cavity and / or the second piston cavity can be pressed to flow into the cavity 210, and the flow medium can consume the kinetic energy generated by the shock wave during the flow process, and the kinetic energy can be converted into internal energy during the compression process, so that the shock wave can be buffered and filtered by the flow and compression of the liquid, and a better buffering and filtering effect can be achieved.

[0044] Further, as a preferred embodiment, the cavity 210 is in communication with a constant pressure cavity 3, which can provide the cavity 210 with flow medium with a constant pressure range. Specifically, it can be understood that when the second buffer member filters the shock wave, the second piston rod is displaced in the second piston to press the flow medium in the second piston, thereby buffering and filtering the vibration. When the shock wave is large, the displacement of the second piston rod will be large, and the flow medium in the cavity will be pressed to a greater extent. After the flow medium is compressed to a certain range, it will be more difficult to continue to compress, and the second buffer member will not be able to continue to buffer. To solve this problem, the cavity 210 is in communication with the constant pressure cavity, and the cavity is provided with flow medium with a constant pressure range, so that when the shock wave is buffered, the second buffer member can generate a constant range of buffering resistance, the flow medium is prevented from being excessively compressed, and the buffering effect of the second buffer member is ensured.

[0045] Further, as a specific embodiment, a pump body 5 is arranged between the constant pressure cavity 3 and the recovery cavity 4, and the pump body 5 is used to pump the flow medium in the recovery cavity 4 into the constant pressure cavity 3.

[0046] Further, referring to Figure 4 , Figure 5 , Figures 7-10 As a specific embodiment, the connection mode of the constant pressure cavity and the cavity and the working principle thereof are as follows: a columnar cavity is provided, a first piston plate 3a is slidably arranged in the columnar cavity, the first piston plate divides the columnar cavity into a constant pressure cavity 3 and a first adjusting cavity, a second compression spring 3b is arranged between the bottom of the first adjusting cavity and the first piston plate, the constant pressure cavity 3 is provided with at least one first flow port 30, the cavity 210 is in communication with the first flow port 30, and Figure 2 , Figure 7 , Figure 9A load bearing plate 8 is designed at the bottom of the tunnel, and a pump body 5 is arranged below the load bearing plate. The load bearing plate 8 supports the conveying structure, such as a conveyor belt, arranged in the tunnel. During the conveying of the coal blocks by the conveying structure, the gravity applied to the load bearing plate changes due to the uneven distribution of the coal blocks on the conveyor belt. Referring to Figure 7 The specific structure of the pump body is as follows: a guide cavity is arranged in the vertical direction or in the height direction of the tunnel, an extrusion cavity 51 is connected to the bottom of the guide cavity, a first piston 53 is slidingly arranged in the guide cavity, a top rod 54 is arranged on the top of the piston, a third compression spring 52 is arranged below the first piston, the top rod 54 is connected to the load bearing plate 8, and the third compression spring 52 provides a support force to the load bearing plate 8. During the conveying of the coal blocks, the degree of compression of the third compression spring 52 changes due to the change of the gravity applied to the load bearing plate 8, and thus the load bearing plate 8 vibrates up and down during the conveying of the coal blocks, so that the first piston reciprocates, and the pressure in the extrusion cavity 51 changes alternately. Two passages are arranged on the extrusion cavity 51, a first one-way valve 5a is arranged on one passage to allow the flowing medium to flow into the extrusion cavity 51, and a second one-way valve 5b opposite to the first one-way valve 5a is arranged on the other passage. The second one-way valve is connected to the constant pressure cavity 3, and the first one-way valve is connected to the recovery cavity 4. Through the above arrangement, the pump body 5 can pump the flowing medium in the recovery cavity 4 to the constant pressure cavity during the conveying of the coal blocks, and the pressure of the flowing medium in the constant pressure cavity is adjusted to be within a constant range by adjusting the pressure of the constant pressure cavity through the adjusting cavity.

[0047] Further, as a specific embodiment, the specific structure of the adjusting cavity is as follows: an adjusting valve 33 is arranged in the adjusting cavity, referring to Figure 10 The adjusting valve includes a valve body, a first valve channel 331, a second valve channel 332, and a third valve channel 333 arranged in parallel and spaced apart in the valve body, and the third valve channel is arranged coaxially with a third piston cavity 335 at one end, a third piston 336 is arranged in the third piston cavity, a valve rod 334 is arranged in the third valve channel, the valve rod 334 is connected to the third piston 336, a first flow port 3351 is arranged at the end of the third piston cavity away from the valve rod and connected to the constant pressure cavity 3, a fourth compression spring 337 is arranged on the side of the third piston away from the first flow port, a flow channel 3341 is arranged on the valve rod, a blind hole 338 is arranged on the side wall of the third piston cavity, a second flow port 3381 is arranged at the bottom of the blind hole and connected to the recovery cavity 4, one end of the first valve channel is connected to the first connecting port 31 of the adjusting cavity, the other end 3312 is connected to the atmosphere, one end of the second valve channel 3321 is connected to the second connecting port 32 of the adjusting cavity, and the other end 3322 is connected to the air pump 6. The specific structure of the air pump 6 is the same as that of the pump body 5 and its working principle, and the vibration generated during the conveying of the coal blocks drives the air pump to work and pump the gas in the tunnel to the adjusting cavity.Figure 10 When the pressure inside the constant pressure chamber is lower than the predetermined pressure range, the second piston is in position. Figure 10 At the position shown, the blind hole 338 is blocked, and the flow groove 3341 corresponds to the second valve channel, allowing the air pump to pump air into the regulating chamber. At the same time, the pump body also pumps the flowing medium inside the return chamber into the constant pressure chamber, thereby increasing the pressure inside the constant pressure chamber. When the pressure inside the constant pressure chamber exceeds the constant range, the second piston is pushed by the flowing medium inside the constant pressure chamber to squeeze the fourth spring, thereby causing the valve stem to move upward. At this time, the blind hole 338 is gradually exposed, and the flow groove on the valve stem corresponds to the first valve channel. At this time, the gas pumped by the air pump cannot flow into the regulating chamber, and the gas inside the regulating chamber flows out through the first regulating valve. The flowing medium inside the constant pressure chamber flows back to the return chamber 4 through the first flow port 3351, the blind hole 338, and the second flow port 3381, thereby reducing the pressure inside the constant pressure chamber. After it is reduced to the predetermined range, the third piston returns to its original position, reopening the second valve channel. This process is repeated to keep the pressure inside the constant pressure chamber within a constant pressure range.

[0048] Furthermore, as a preferred embodiment, refer to Figure 9 An air storage chamber 7 is provided between the air pump 6 and the regulating valve 33. A third piston plate 7a is designed inside the air storage chamber. A fifth compression spring 7b is provided between the third piston plate and the end of the air storage chamber. A first air port 71 is provided on the air storage chamber, which is connected to the other end 3322 of the second valve channel 332. The air storage chamber is also connected to the air pump. By providing the air storage chamber, the gas pumped out by the air pump when the second valve channel is disconnected can be stored in the air storage chamber. Thus, even when the air pump is not working, the gas stored in the air storage chamber can regulate the air pressure in the regulating chamber, thereby regulating the pressure in the constant pressure chamber.

[0049] Furthermore, as a specific implementation method, refer to Figure 4 , Figure 5 , Figure 9 The cavity 210 is provided with an outlet 2101, which is connected to a recovery chamber 4 via a connecting channel 215. A regulating valve 216 is configured on the connecting channel 215, and the regulating valve 216 is used to open when the pressure of the flowing medium inside the cavity 210 increases instantaneously. Specifically, as a specific embodiment, refer to... Figure 4, the container cavity is communicated with the second piston cavity through the liquid channel 24310, the outlet 2101 is arranged at the end of the second piston cavity 2431 away from the second piston rod and communicated, the side wall of the second piston cavity is provided with a third valve channel 2150 intersecting with the communication channel 215, the adjusting valve comprises a cylindrical valve body 2160 coaxially arranged with the third valve channel 2150, a piston block 2161 arranged in the cylindrical valve body, a second valve rod 2162 arranged on the piston block and penetrating into the third valve channel, and a sixth compression spring 2163 arranged between the end of the cylindrical valve body away from the third valve channel and the piston block, under the elastic force of the sixth compression spring, the second valve rod can extend into the third valve channel, at this time, the second valve rod can prevent the flowing medium from flowing out of the third valve channel, and the bottom of the second piston cavity is further provided with a liquid channel 2443 communicated with the third valve channel, one end of the liquid channel is located in the middle region of the inner wall surface of the third valve channel, the third valve rod is provided with a liquid guide groove 21620 matched with the liquid channel, and the piston block is provided with a flow channel 21610 penetrating through the piston block, and the cylindrical valve body 2160 is designed to have a second outlet 21601 communicated with the backflow cavity. Figure 5 When no vibration shock wave is generated, the pressure of the flowing medium in the container cavity is within the constant pressure range consistent with the constant pressure cavity, at this time, under the elastic force of the sixth compression spring, the third valve rod closes the communication channel, at this time, the flowing medium in the container cavity 210 can flow back to the backflow cavity through the liquid channel 2443, the liquid guide groove 21620, the flow channel 21610 and the second outlet 21601, so that the pressure in the container cavity is within a constant range, when the vibration shock wave is generated, the first piston cavity or the second piston cavity is extruded and impacted, so that the pressure of the flowing medium in the container cavity can be instantaneously increased, at this time, the pressure on the side of the cylindrical cavity body, which is close to the third valve channel 2150, is instantaneously increased, so that the piston block 2161 generates an instantaneous pressure difference on both sides, thereby pushing the piston block to extrude the sixth compression spring and move, pulling the second valve rod to move and open the communication channel 215, at this time, the flowing medium in the container cavity flows back to the backflow cavity from the communication channel, at this time, the flowing medium can flow out of the communication channel 215 and the liquid channel 2443 at a speed greater than the pumping speed of the liquid pump to the container cavity, so as to reduce the pressure in the container cavity 210, after the pressure in the container cavity is reduced, the pressure on both sides of the piston block tends to be balanced, under the elastic force of the sixth compression spring, the piston block is reset, and the valve rod re-closes the communication channel 215, through the above arrangement, the phenomenon that the instantaneous pressure is too high and the buffering resistance of the first buffering assembly and the second buffering assembly is too large can be further reduced, and a better buffering effect can be achieved.

[0050] The above description is only the preferred embodiment of the present application and the explanation of the technical principles. It should be understood by those skilled in the art that the scope of the protection of the present application is not limited to the technical solutions formed by the specific combinations of the above technical features. It should also cover other technical solutions formed by the combinations of the above technical features or their equivalent features without departing from the concept of the present application. For example, the technical solutions formed by the mutual replacements of the above features and the technical features disclosed in the present application (but not limited to) with similar functions.

Claims

1. A supporting device for the surrounding rock of a coal mine roadway, characterized in that, include: Support (1); The load-bearing plate assembly (2) is disposed above the support body and includes a first support plate (21) and a second support plate (22) spaced apart from bottom to top along the height direction of the roadway. A first buffer unit (23) is disposed between the first support plate and the support body (1), and a second buffer unit (24) is disposed between the first support plate (21) and the second support plate (22). The first buffer unit (23) is used to provide buffer force in the height direction of the roadway to the first support plate (21) and the support body (1), and the second buffer unit (24) is used to provide buffer force in the horizontal direction to the first support plate and the second support plate. The first buffer unit (23) includes a plurality of first buffer components (23a). The first buffer component (23a) includes a first piston chamber (230) disposed on one of the support body (1) and the first support plate (21) and disposed along the height direction of the roadway, a first piston rod (231) guided and disposed in the first piston chamber (230), and a first buffer body (232) disposed between the first piston rod (231) and the first piston chamber. The second buffer unit (24) includes a plurality of second buffer components (24a) evenly disposed between the first support plate (21) and the second support plate (22). The second buffer component (24a) includes a first support (241) disposed on one of the first support plate (21) and the second support plate (22), at least one second support (242) disposed on the other of the first support plate (21) and the second support plate (22) and disposed around the first support (241), and a second buffer member (243) disposed between the first support (241) and the second support. The second buffer (243) includes a second piston chamber (2431) with its axis horizontally arranged, a second piston rod (2432) disposed in the second piston chamber, and a second buffer body (2433) disposed in the second piston chamber. The axes of the three first piston chambers disposed around each first support body are arranged along the length or width direction of the roadway. The first support plate (21) is provided with a cavity (210), which is connected to both the first piston cavity and the second piston cavity. The first buffer body (232) and the second buffer body (2433) both include a flow medium filled in the cavity. The cavity (210) is connected to a constant pressure cavity (3), which can provide the cavity (210) with a flowing medium with a constant pressure. The cavity (210) is provided with an outlet (2101), and the outlet (2101) is connected to a recovery cavity (4) through a connecting channel (215). A regulating valve (216) is provided on the connecting channel (215), and the regulating valve (216) is used to open when the pressure of the flowing medium inside the cavity (210) increases instantaneously. A pump body (5) is arranged between the constant pressure cavity (3) and the recovery cavity (4), and is used for pumping the flowing medium in the recovery cavity (4) into the constant pressure cavity (3).

2. The supporting device for the surrounding rock of a coal mine roadway according to claim 1, characterized in that, The second buffer assembly (24a) comprises four first support plates (21) arranged at four corners of the second buffer assembly (24a), and each of the first support plates (21) is provided with three second support bodies (242) at intervals of 90 degrees around the first support plate (21).

3. The supporting device for the surrounding rock of a coal mine roadway according to claim 2, characterized in that, The first buffer body (232) further comprises a first compression spring (212a) arranged between the first piston cavity and the first piston rod.

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