A movable slurry blocking device and a slurry blocking method for filling mining

Abstract

The embodiment of the present invention discloses a movable slurry blocking device and a slurry blocking method for backfilling mining, which relates to the technical field of underground engineering construction. It is convenient to improve construction efficiency. The equipment includes: a walking system, a hydraulic lifting frame and a slurry blocking plate. The walking system is provided with a hydraulic control console. The hydraulic lifting frame has a hydraulic cylinder. The hydraulic control console is connected to the hydraulic cylinder through an oil circuit. The slurry blocking plate includes a plurality of columns arranged side by side at intervals. The plurality of columns are connected into a whole through a connecting beam. The connecting beam is provided with a plurality of beams along the longitudinal direction of the column, and the connecting beam can slide up and down on the column. A bag that can be filled with a medium is fixed between adjacent columns and on the connecting beam, and a medium channel is reserved on the bag. The embodiment of the present invention is suitable for backfilling mining in coal mines.

Description

Technical Field

[0001] The invention relates to the technical field of underground engineering construction, and in particular to a movable slurry blocking device and a slurry blocking method for filling mining. Background Art

[0002] Backfill mining is a green coal mining technology that solves the problems of "three coal pressures", coal gangue emissions, and land resource shortages. It can effectively control surface subsidence and ensure coal mine production safety. Backfill mining will account for an increasingly larger proportion in coal mining.

[0003] In the process of coal mine roadway cementing filling mining, installing slurry retaining plates is an essential work before filling the branch roadway. The slurry retaining plates play a role of airtight isolation, separating the first branch roadway from the external roadway to prevent the filling slurry from overflowing.

[0004] At present, domestic coal mines use engineering analogy and empirical methods to design slurry retaining plates. The retaining plates are mostly in the form of steel formwork, which has a complex construction process, takes a long time to set up, and has high labor intensity, which affects construction efficiency. Summary of the invention

[0005] In view of this, an embodiment of the present invention provides a movable slurry blocking device and a slurry blocking method for backfill mining, which can solve the above-mentioned technical problems in the prior art and facilitate improving construction efficiency.

[0006] In the first aspect, an embodiment of the present invention provides a movable slurry blocking device, comprising: a walking system, a hydraulic lifting frame and a slurry blocking plate, the walking system is provided with a hydraulic control console, the hydraulic lifting frame has a hydraulic cylinder, the hydraulic control console is connected to the hydraulic cylinder through an oil circuit, the slurry blocking plate comprises a plurality of columns arranged side by side and spaced apart, the plurality of columns are connected into a whole by a connecting beam, a plurality of connecting beams are provided along the longitudinal direction of the columns, and the connecting beams can slide up and down on the columns, a bag fillable with a medium is fixed between adjacent columns and on the connecting beam, a medium channel is reserved on the bag; one end of the hydraulic lifting frame is connected to the walking system and is located at the front of the walking system, and the other end of the hydraulic lifting frame is connected to the connecting beam of the slurry blocking plate.

[0007] According to a specific implementation method of the embodiment of the present application, the connecting beam includes a first clamping plate and a second clamping plate, a first side surface of the first clamping plate is respectively provided with a plurality of first recesses at intervals, and the portion between adjacent first recesses is a first straight portion, a second side surface of the second clamping plate is respectively provided with a plurality of second recesses at intervals, and the portion between adjacent second recesses is a second straight portion, the first recesses of the first clamping plate are wrapped around a portion of the side surface of the column, the second recesses of the second clamping plate are wrapped around another portion of the side surface of the column, the first side surface of the first clamping plate is mate-jointed with the second side surface of the second clamping plate, and the first straight portion is mate-jointed with the second straight portion to form a bag clamping portion.

[0008] According to a specific implementation of the embodiment of the present application, a sliding film is provided on the inner concave surfaces of the first concave portion and the second concave portion.

[0009] According to a specific implementation of the embodiment of the present application, the wrapping space formed after the first recess and the second recess are matched is consistent with the outer contour of the column.

[0010] According to a specific implementation method of the embodiment of the present application, the first recessed portion and the second recessed portion are respectively concave arc-shaped structures.

[0011] According to a specific implementation method of an embodiment of the present application, the bag includes a slurry retaining body and a stamping part, the slurry retaining body is a hollow structure, the medium channel is located on the slurry retaining body, the stamping part is located around the slurry retaining body, and the bag is connected to the connecting beam through the stamping part.

[0012] According to a specific implementation of the embodiment of the present application, a needle valve is provided on the medium injection channel, an electrical signal contact is provided on the needle valve, a pressure sensor is provided inside the bladder, and a wiring terminal of the pressure sensor is connected to the electrical signal contact of the needle valve.

[0013] According to a specific implementation of the embodiment of the present application, the material of the bag is mainly polyphthalamide fabric.

[0014] According to a specific implementation of the embodiment of the present application, a side slurry retaining seal is provided on the outer side of the column located at the edge, and one end of the side slurry retaining seal is connected to the column at the edge.

[0015] In the second aspect, the present invention provides a slurry blocking method for backfill mining, which is implemented based on the above-mentioned movable slurry blocking device, including: after the excavation at both ends of the first branch tunnel is through, the movable slurry blocking device is docked at the two ends of the first branch tunnel, and the column is supported on the bottom plate close to the coal seam side and corresponding to the port of the first branch tunnel, so that the top of the column is supported on the top plate; after the column is supported, the hydraulic control console is used to control the lifting of the hydraulic lifting frame to drive the connecting beam connected to the other end of the hydraulic lifting frame to slide upward along the column; while the connecting beam slides upward, the bag connected to the connecting beam is pulled upward to gradually unfold; after sliding on the connecting beam until the bag is fully unfolded, a medium injection device is connected to the medium channel of the bag; after the connection is completed, the medium is injected into the bag through the medium channel to fill the bag; as the medium in the bag is injected, the port of the first branch tunnel is automatically blocked for slurry blocking in the subsequent grouting process.

[0016] The movable slurry blocking device and the slurry blocking method for backfill mining provided in the embodiments of the present invention inject medium into the bag through the medium injection equipment to quickly form a fully enclosed slurry blocking board. Compared with traditional wooden slurry blocking boards and steel slurry blocking boards, this slurry blocking device is easy and quick to set up, and the slurry blocking board is installed on the walking system through a hydraulic lifting frame, which greatly reduces the time for moving the large-volume integral slurry blocking board underground, thereby facilitating the improvement of construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a schematic structural diagram of a movable slurry retaining device according to an embodiment of the present invention;

[0019] Figure 2 for Figure 1 The schematic diagram of the arrangement of the movable slurry retaining device and the first branch lane is shown;

[0020] Figure 3 for Figure 1 A schematic diagram of the structure of a hydraulic lifting frame of a movable slurry retaining device;

[0021] Figure 4 for Figure 1 A schematic diagram of a first clamping portion and a second clamping portion of the movable slurry retaining device;

[0022] Figure 5 for Figure 1A schematic structural diagram of a connecting beam of a movable slurry retaining device shown;

[0023] Figure 6 for Figure 1 A schematic structural diagram of a slurry blocking plate and a side slurry blocking seal of a movable slurry blocking device is shown. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] It should be clear that in order to more clearly illustrate the present invention, many technical details are described in the following specific embodiments. Those skilled in the art should understand that the present invention can also be implemented without some of the details. In addition, in order to highlight the main purpose of the present invention, some methods, means, parts and their applications well known to those skilled in the art are not described in detail, but this does not affect the implementation of the present invention. The embodiments described herein are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0026] Embodiment 1

[0027] like Figures 1 to 6 As shown, the movable slurry blocking device provided by the embodiment of the present invention includes: a walking system 1, a hydraulic lifting frame 2 and a slurry blocking plate 3. The walking system 1 is provided with a hydraulic control console 4. The hydraulic lifting frame 2 has a hydraulic cylinder 5. The hydraulic control console 4 is connected with the hydraulic cylinder 5 through an oil circuit. The slurry blocking plate 3 includes a plurality of columns 6 arranged side by side and at intervals. The plurality of columns 6 are connected into a whole through a connecting beam 7. A plurality of connecting beams 7 are provided along the longitudinal direction of the columns 6, and the connecting beams 7 can slide up and down on the columns 6. A bag 8 that can be filled with a medium is fixed between adjacent columns 6 and on the connecting beam 7, and a medium channel is reserved on the bag 8 (not shown in the figure); one end of the hydraulic lifting frame 2 is connected to the walking system 1 and is located at the front of the walking system 1, and the other end of the hydraulic lifting frame 2 is connected to the connecting beam 7 of the slurry blocking plate 3.

[0028] The walking system 1 is a crawler walking system. Since the contact area between the crawler and the ground is relatively large, the movable slurry retaining device in this embodiment can move smoothly, quickly and safely in complex underground road conditions.

[0029] There are also stable legs 9 on both sides of the walking system 1. The stable legs 9 can be in the form of a rotating rod with threaded fit. When the movable slurry retaining device needs to be moved, the stable legs 9 can be retracted by rotating; see Figure 2 When the movable slurry blocking device needs to be fixed to isolate the branch tunnel in a closed manner, the stabilizing legs 9 are lowered by rotating and placed at a suitable height, thereby placing the movable slurry blocking device in a stable state.

[0030] The stabilizing legs 9 can also be in the form of hydraulic struts, connected to the hydraulic control console 4, and the stabilizing legs 9 can be raised and lowered through the hydraulic control console 4, so that the movable slurry retaining device can be easily moved and can be in a stable state when the branch tunnel is closed and isolated.

[0031] The hydraulic lifting frame 2 can be a connecting rod hydraulic lifting frame or a swing type hydraulic lifting frame. Figure 3 In this embodiment, a connecting rod hydraulic lifting mechanism is adopted, which has a hydraulic cylinder 5 and a five-link telescopic end 10. After the five-link telescopic end 10 is connected to the connecting beam 7, under the action of the hydraulic cylinder 5, the rotation of the cross bar drives the remaining rods directly connected to the connecting beam 7 to rotate, so that the connecting beam 7 moves up and down, thereby realizing the expansion and contraction of the bag 8.

[0032] The column 6 is composed of a cylinder 11 and a plunger 12, wherein the cylinder 11 is connected to the hydraulic control console 4 through an oil circuit, and the cylinder 11 can move up and down along the plunger 12. Therefore, the cylinder 11 can be automatically raised and lowered by the hydraulic control console 4, thereby controlling the automatic raising and lowering of the column 6, thereby realizing the automatic raising and lowering of the slurry shield 3, thereby enabling the movable slurry shield device to be moved conveniently and quickly.

[0033] The bladder bag 8 can be a whole large bladder bag 8, or it can be formed by connecting a plurality of small bladder bags through the bladder bag clamping portion 13. In order to enable an external device to inject a medium into the bladder bag 8 and realize the airtight isolation of the first branch lane 14, a medium channel is reserved on the bladder bag 8.

[0034] The medium refers to gas or liquid. For the convenience of description, the following description is made by taking the medium being gas and the medium channel being a gas channel as an example.

[0035] The movable slurry blocking device provided in the embodiment of the present invention injects medium into the bag 8 through the medium injection equipment to quickly form a fully enclosed slurry blocking board 3. Compared with traditional wooden slurry blocking boards and steel slurry blocking boards, this slurry blocking device is convenient and quick to set up, and the slurry blocking board 3 is installed on the walking system 1 through the hydraulic lifting frame 2, which greatly reduces the time for moving the large-volume integral slurry blocking board 3 underground, facilitates improving construction efficiency, and can reduce the labor intensity of workers.

[0036] See also Figure 4 and Figure 5In one embodiment, the connecting beam 7 includes a first clamping plate 15 and a second clamping plate 16. A plurality of first recesses 17 are respectively provided on the first side surface of the first clamping plate 15, and the portion between adjacent first recesses 17 is a first straight portion 18. A plurality of second recesses 19 are respectively provided on the second side surface of the second clamping plate 16, and the portion between adjacent second recesses 19 is a second straight portion 20. The first recesses 17 of the first clamping plate 15 are wrapped around a portion of the side surface of the column 6, and the second recesses 19 of the second clamping plate 16 are wrapped around another portion of the side surface of the column 6. The first side surface of the first clamping plate 15 is connected to the second side surface of the second clamping plate 16, and the first straight portion 18 is connected to the second straight portion 20 to form a bag clamping portion 13.

[0037] The number of the first recesses 17 and the second recesses 19 is the same as the number of the columns 6. The first recesses 17 and the second recesses 19 are wrapped around the side surfaces of the columns 6, and after being matched, a closed wrapping space consistent with the outer contour of the columns 6 is formed, so that the first recesses 17 and the second recesses 19 can be tightly wrapped around the columns 6 after being matched. As a result, the connecting beam 7 moves up and down under the guidance of the columns 6, which has an anti-mistake effect.

[0038] A lubricating membrane (not shown in the figure) is provided on the inner concave surfaces of the first recess 17 and the second recess 19. The lubricating membrane here refers to a membrane-like object made of oil or smooth material, which can reduce the friction between the connecting beam 7 and the column 6, making the connecting beam 7 move up and down on the column 6 smoother, avoiding damage to the hydraulic lifting frame 2 due to the jamming of the connecting beam 7, thereby improving construction efficiency.

[0039] The first straight portion 18 and the second straight portion 20 are combined to form the bag clamping portion 13; when the bag 8 is formed by connecting multiple small bags, the bag clamping portion 13 can connect them into a whole, thereby achieving full closure of the slurry retaining plate 3 and the branch lane opening, and ensuring the airtightness of the site; when the bag 8 is an integral bag, the bag clamping portion 13 can divide it into multiple small parts, and the part of the bag 8 in contact with the bag clamping portion 13 has no gas, thereby making the gas between the various parts of the bag 8 uniform.

[0040] The first straight portion 18 and the second straight portion 20 can be joined by gluing, welding or threaded connection. In this embodiment, screws 21 and screw holes (not shown in the figure) are provided at both ends of the connecting beam, and a threaded connection is adopted. By tightening the screws 21, the first clamping portion 15 and the second clamping portion are connected as a whole to form a connecting beam 7.

[0041] In one embodiment, the first concave portion 17 and the second concave portion 19 are respectively concave arc-shaped structures.

[0042] The shapes of the first recess 17 and the second recess 19 may also be other shapes, such as a triangular prism, a quadrangular prism, etc., which may vary according to the different outer contour shapes of the pillar 6 .

[0043] In one embodiment, the bag 8 includes a slurry retaining body 22 and a stamping portion (not shown in the figure), the slurry retaining body 22 is a hollow structure, the gas channel is located on the slurry retaining body 22, the stamping portion is located around the slurry retaining body 22, and the bag 8 is connected to the connecting beam 7 through the stamping portion.

[0044] The slurry retaining body 22 is a hollow structure, and gas can be injected through the gas channel to prop up the bag 8, or the bag 8 can be in a contracted state when there is no gas. This makes it convenient to install and support the slurry retaining plate 3, and can also be quickly propped up to achieve closed isolation of the branch tunnel when filling and mining are required.

[0045] When installing the bag 8, the positions of the stamped portion and the first straight portion 18 / or the second straight portion 20 on the connecting beam 7 are matched one by one, and the first straight portion 18 / or the second straight portion 20 is installed to complete the installation of the bag 8, which is convenient and quick, and increases construction efficiency.

[0046] In one embodiment, a needle valve (not shown in the figure) is provided on the gas channel, an electrical signal contact is provided on the needle valve, a pressure sensor (not shown in the figure) is provided inside the bag 8, and a wiring terminal of the pressure sensor (not shown in the figure) is connected to the electrical signal contact of the needle valve (not shown in the figure).

[0047] A gas injection device (not shown in the figure) is connected to a needle valve, and injects gas into the bag 8 through the needle valve; a pressure sensor is provided in the bag 8 for detecting pressure changes in the bag 8, and is capable of converting pressure changes in the bag 8 into electrical signals; in order to transmit the electrical signals to a control device (not shown in the figure) of the gas injection device, electrical signal contacts are provided on the needle valve, thereby facilitating connection between the wiring terminals on the pressure sensor and the electrical signal contacts on the needle valve; thereby, the control device can determine whether the bag 8 is filled with gas based on the received electrical signal, and close the gas passage when the bag 8 is filled with gas.

[0048] It can be understood that, in this embodiment, by providing an electrical signal contact on the needle valve, the functions of injecting the medium and transmitting the electrical signal can be achieved.

[0049] The gas may be injected as the bladder 8 is expanded, or may be injected after the bladder 8 is fully expanded.

[0050] In one embodiment, the material of the bag 8 is mainly polyphthalamide fabric.

[0051] In order to enable the bladder bag 8 to withstand greater pressure, a semi-hard polymer material is used to make the bladder bag 8. In this embodiment, polyphthalamide fabric is selected.

[0052] See also Figure 6 In one embodiment, a side slurry blocking seal 23 is provided on the outer side of the column 6 located at the edge, and one end of the side slurry blocking seal 23 is connected to the column 6 at the edge.

[0053] In some embodiments, the side slurry blocking seal 23 is a bag that can be filled with a medium. A medium injection port (not shown in the figure) is provided on the bag. The medium injection port is used to inject medium such as gas, liquid or flowing particles into the bag. A support frame 24 is provided in the bag to assist in shaping the bag after the medium is filled into the bag. Support ribs 25 are provided on the edge of the bag. When the slurry blocking plate is set at the end of the branch tunnel for slurry blocking, after the side slurry blocking bag is filled with the medium, it relies on the support ribs 25 on the edge to rest against the coal wall, thereby enhancing the performance of the side slurry blocking seal in resisting the reaction impact force of the internal slurry. The top and bottom ends of the support ribs are connected to the support frame. The side slurry blocking seal formed as a whole can better prevent the slurry from leaking out from the side of the branch tunnel.

[0054] In some preferred embodiments, the support rib 25 is provided with a threaded rib (not shown in the figure) extending from the side, and an expansion nut with a wedge-shaped end is sleeved on the threaded rib. When it is necessary to fill and grout into the branch tunnel, the device is docked at the end of the branch tunnel, and the support rib is anchored in the coal wall through the threaded rib arranged on the side and the wedge-shaped end of the expansion nut to enhance the slurry retaining performance of the slurry retaining plate.

[0055] In some preferred embodiments, the support ribs are wrapped with rubber sleeves to enhance the sealing performance after contact with the coal wall, thereby further enhancing the slurry blocking effect of the slurry blocking device.

[0056] Embodiment 2

[0057] The slurry blocking method for backfill mining provided by the embodiment of the present invention is based on the above-mentioned device and includes:

[0058] After the two ends of the first branch tunnel are mined and connected, the movable slurry blocking device is parked at the two ends of the first branch tunnel, and the column is supported on the bottom plate near the coal seam side and corresponding to the first branch tunnel port, so that the top of the column is supported on the top plate. Specifically, when the two ends of the branch tunnel are connected, the slurry blocking device can be immediately installed at the two ends of the branch tunnel to start the filling operation.

[0059] After the support of the column is completed, the hydraulic control console is used to control the lifting of the hydraulic lifting frame, so as to drive the connecting beam connected to the other end of the hydraulic lifting frame to slide upward along the column.

[0060] When the connecting beam slides upward, the bag connected to the connecting beam is pulled upward to gradually expand.

[0061] After the bladder is completely unfolded after sliding on the connecting beam, a gas injection device is connected to the gas channel of the bladder.

[0062] After the connection is completed, gas is injected into the bag through the gas channel to fill the bag. Specifically, the gas channel of the bag can be connected to the gas injection device before the bag is unfolded, and gas is injected to fill the bag during the unfolding process.

[0063] As the gas in the bag is injected, the port of the first branch tunnel is automatically blocked to prevent slurry from leaking out from the side of the first branch tunnel. Specifically, as the gas in the bag is injected, the side slurry blocking seal is also deployed to block the port of the first branch tunnel together with the bag to prevent slurry from leaking out from the side of the first branch tunnel.

[0064] After the first branch lane is grout-filled, the device is moved to the second branch lane, and the above steps are repeated to perform grout-filling of the second branch lane. Specifically, when the binder solidifies and stops flowing, the grout-blocking device is moved to the next branch lane.

[0065] The present invention provides a movable slurry blocking device with superior force bearing, safety and high efficiency, and a slurry blocking method for backfill mining. The slurry blocking plate of the slurry blocking device is of a fully enclosed airbag type, which can automatically extend and retract up and down as the backfill slurry rises. A pressure sensor is installed in the airbag to monitor the force condition of the backfill body in real time. The slurry blocking plate is installed on a crawler walking system, thereby avoiding the complicated process of supporting the slurry blocking plate and the time of moving the large-volume integral slurry blocking plate underground.

[0066] This slurry blocking device mainly installs fully enclosed air bag slurry blocking plates at the upper and lower exits of the working face connecting tunnel, which can reduce the probability of slurry leakage during filling, increase the speed of supporting the slurry blocking plates during filling, and reduce the pressure on the working face roof and the sinking amount of the overlying tunnel; and the fully enclosed air bag slurry blocking plates ensure the airtightness of the first branch tunnel, improve the slurry blocking effect, reduce the complexity of the filling process, reduce the time spent on the filling process, and improve the filling coal mining efficiency.

[0067] It should be noted that, in this article, the emphasis of the scheme described between the various embodiments is different, but the various embodiments have a certain interrelated relationship. When understanding the scheme of the present application, the various embodiments can refer to each other; in addition, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements inherent to such a process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0068] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A movable slurry retaining device, characterized in that: include: A walking system, a hydraulic lifting frame and a slurry guard, wherein the walking system is provided with a hydraulic control console, the hydraulic lifting frame has a hydraulic cylinder, the hydraulic control console is connected to the hydraulic cylinder through an oil circuit, the slurry guard comprises a plurality of columns arranged side by side at intervals, the plurality of columns are connected into a whole through a connecting beam, a plurality of connecting beams are provided along the longitudinal direction of the columns, and the connecting beams can slide up and down on the columns, a bag that can be filled with a medium is fixed between adjacent columns and on the connecting beam, and a medium channel is reserved on the bag; One end of the hydraulic lifting frame is connected to the walking system and is located in front of the walking system, and the other end of the hydraulic lifting frame is connected to the connecting beam of the slurry guard plate; The connecting beam includes a first clamping plate and a second clamping plate, a plurality of first recesses are respectively arranged on the first side surface of the first clamping plate, and the portion between adjacent first recesses is a first straight portion, a plurality of second recesses are respectively arranged on the second side surface of the second clamping plate, and the portion between adjacent second recesses is a second straight portion, the first recesses of the first clamping plate are wrapped around a part of the side surface of the column, and the second recesses of the second clamping plate are wrapped around another part of the side surface of the column, the first side surface of the first clamping plate is connected to the second side surface of the second clamping plate, and the first straight portion is connected to the second straight portion to form a bag clamping portion; The bag comprises a slurry retaining body and a stamping part, the slurry retaining body is a hollow structure, the medium channel is located on the slurry retaining body, the stamping part is located around the slurry retaining body, and the bag is connected to the connecting beam through the stamping part; The medium channel is provided with a needle valve, the needle valve is provided with an electrical signal contact, a pressure sensor is provided inside the bladder, and a wiring terminal of the pressure sensor is connected to the electrical signal contact of the needle valve.

2. The movable slurry retaining device according to claim 1, characterized in that: A lubricating film is provided on the inner concave surfaces of the first concave portion and the second concave portion.

3. The movable slurry retaining device according to claim 1, characterized in that: The wrapping space formed by the first recess and the second recess being aligned is consistent with the outer contour of the column.

4. The movable slurry blocking device according to claim 3 is characterized in that: The first concave portion and the second concave portion are respectively concave arc-shaped structures.

5. The movable slurry retaining device according to claim 1, characterized in that: The material of the bag is polyphthalamide fabric.

6. The movable slurry retaining device according to claim 1, characterized in that: A side slurry blocking seal is arranged on the outer side of the column located at the edge, and one end of the side slurry blocking seal is connected to the column at the edge.

7. A slurry blocking method for backfill mining, characterized in that: The movable slurry retaining device according to any one of claims 1 to 6 is implemented, comprising: After the two ends of the first branch tunnel are mined and connected, the movable slurry blocking device is parked at the two ends of the first branch tunnel, and the column is supported on the bottom plate close to the coal seam side and corresponding to the first branch tunnel port, so that the top of the column is supported on the top plate; After the support of the column is completed, the hydraulic control console is used to control the lifting of the hydraulic lifting frame, driving the connecting beam connected to the other end of the hydraulic lifting frame to slide upward along the column; When the connecting beam slides upward, the bag connected to the connecting beam is pulled upward and gradually expanded; After the bladder bag is fully unfolded after sliding on the connecting beam, a medium injection device is connected to the medium channel of the bladder bag; After the connection is completed, the medium is injected into the pouch through the medium channel to fill the pouch; As the medium in the bag is injected, the port of the first branch tunnel is automatically blocked to block grouting during the subsequent grouting process.

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