Coal mining methods

Abstract

This invention provides a coal mining method, comprising: excavating a first cut-out on the side of the corner coal face near the cutterhead face; excavating a second cut-out on the side of the corner coal away from the cutterhead face; excavating a transport roadway side-continuing face on the cutterhead face, the transport roadway side-continuing face being located between the first and second cut-outs, both of which are connected to the transport roadway side-continuing face; and providing a storage chamber at the connection between the first cut-out and the transport roadway side-continuing face, the storage chamber being located on the side of the first cut-out, the storage chamber being used to store a spare hydraulic support, so that after the device in the transport roadway side-continuing face is removed, the spare hydraulic support is pushed out from the storage chamber to the connection between the first cut-out and the transport roadway side-continuing face for support. The technical solution provided by this invention can solve the technical problem of certain safety hazards in the prior art of mining corner coal using a cutterhead face.

Description

Technical Field

[0001] This invention relates to the field of coal mining technology, and more specifically, to a coal mining method. Background Technology

[0002] Currently, when excavating corner coal located at the edge of the cutterhead working face, the coal transportation system of the cutterhead working face necessitates the use of a side-continuation face via the transport roadway. To address the issues of large workload and long installation time associated with equipment relocation during the side-continuation face installation, the installation of hydraulic supports, scraper conveyors, transfer conveyors, and belt conveyors within the two cutters is completed during the initial stage of working face installation. This allows for coordinated management and efficient utilization of personnel during the face continuation phase, minimizing downtime and avoiding safety hazards caused by a large number of personnel relocating and installing equipment in the same location.

[0003] However, the following problems still exist on the side of the transport roadway: the southern extension face transport roadway needs to be connected with a belt conveyor and a transfer machine to the scraper conveyor laid in the cut of the northern normal face to complete the coal transport task of the working face. Since the belt conveyor with a laying width of 1.5m cannot be equipped with hydraulic supports, there is a 1.5m gap between the two supports when the southern extension face and the northern normal face are connected, which poses a hidden danger to the safe production of the working face. Summary of the Invention

[0004] The main objective of this invention is to provide a coal mining method to solve the technical problem of certain safety hazards in the process of mining edge coal using a cutterhead working face in the prior art.

[0005] To achieve the above objectives, according to one aspect of the present invention, a coal mining method is provided for mining corner coal located at the corner of the cutterhead working face; the coal mining method includes:

[0006] Dig the first cut on the side of the working face near the edge coal, and dig the second cut on the side of the edge coal away from the working face.

[0007] The side continuation face of the transport roadway is excavated on the working face of the cutter handle. The side continuation face of the transport roadway is located between the first cut and the second cut, and both the first cut and the second cut are connected to the side continuation face of the transport roadway.

[0008] A storage chamber is provided at the connection between the first cut and the side continuation surface of the transport roadway. The storage chamber is located on the side of the first cut and is used to store spare hydraulic supports. After the device in the side continuation surface of the transport roadway is removed, the spare hydraulic supports are pushed out from the storage chamber to the connection between the first cut and the side continuation surface of the transport roadway for support.

[0009] Furthermore, after the device within the side face of the transport roadway is removed, the spare hydraulic support is pushed out of the storage chamber to the connection point between the first cut and the side face of the transport roadway for support, including:

[0010] Coal is mined from the edge and corner along the direction from the second cut to the first cut, and a belt conveyor is installed in the side face of the transport roadway.

[0011] When the distance between the working face and the continuation face is less than or equal to the first preset distance, the belt conveyor is first removed, and then the spare hydraulic support is pushed out to the connection between the first cut and the side continuation face of the transport roadway.

[0012] Furthermore, after the backup hydraulic support is subsequently pushed out to the connection point between the first cut and the side face of the transport roadway, the coal mining method also includes:

[0013] A scraper conveyor is installed on the side of the transport roadway, and the spare hydraulic support is pushed back into the storage chamber.

[0014] Furthermore, after installing a scraper conveyor at the side face of the transport roadway and pushing the spare hydraulic support back into the storage chamber, the coal mining method also includes:

[0015] After the second cut is connected to the first cut, the scraper conveyor at the side continuation surface of the transport roadway is removed, and the spare hydraulic support is pushed out of the storage chamber to the connection point between the first cut and the side continuation surface of the transport roadway.

[0016] Furthermore, coal mining methods also include:

[0017] When mining along the mining direction from the second cut to the first cut, when the distance between the working face and the first cut is less than or equal to the fourth preset distance, the dip length, the upper and lower elevations of the working face, and the pseudo-inclination are measured at every fifth preset distance, and the change in the length of the working face is calculated.

[0018] The specific position of the docking bracket is marked at the lower opening of the first cut, and a position detector is installed at the first cut to control the movement of the scraper conveyor through the detection of the position detector, so that the upper support of the working surface docks with the lower support of the first cut.

[0019] Furthermore, coal mining methods also include:

[0020] A measure roadway is excavated at one end of the first cut near the return air roadway. The measure roadway is located between the first cut and the return air roadway, and its two ends are connected to the first cut and the return air roadway, respectively.

[0021] Furthermore, coal mining methods also include:

[0022] Let the construction width of the tunnel be 'a', the support width of the spare hydraulic support be 'b', and the minimum working width of the scraper conveyor be 'c'; so that a, b, and c satisfy the following relationship:

[0023] a+b≥c.

[0024] Furthermore, during the process of mining the corner coal along the direction from the second cut to the first cut, the mining method also includes:

[0025] When the distance between the working face and the second cut is less than or equal to the second preset distance, the working face is used to carry out unmarked layer mining, and the working face is controlled to carry out layer mining layer by layer according to the predetermined layer-penetrating slope during the mining process, while avoiding the goaf area in the cutter face.

[0026] The second preset distance is greater than the first preset distance.

[0027] Furthermore, controlling the working face to mine layer by layer according to the predetermined cross-layer slope during the mining process includes:

[0028] Every third preset distance, the current elevation of the working face is measured, and the measured current elevation is compared and analyzed with the elevation of the goaf floor. Based on the comparison and analysis results, it is determined whether there is a deviation in the working layer of the working face.

[0029] Furthermore, in the process of mining unmarked seams using the working face, the coal mining methods also include:

[0030] A layer of interbedded rock at the mining site is marked as a marker layer, and the extension trend of the interbedded rock is predicted based on relevant parameters of the interbedded rock.

[0031] The relative positions of the interbedded rocks within the current excavation face are measured, and the measured positions are compared with the predicted extension trends of the interbedded rocks. The excavation of the working face is then corrected based on the comparison results.

[0032] By applying the technical solution of this invention, a storage chamber and hydraulic supports are provided. After the equipment in the transport roadway side face is dismantled, the hydraulic supports are promptly moved out of the storage chamber to improve support strength and ensure operational safety. When it is necessary to install coal mining equipment in the transport roadway side face, the hydraulic supports are moved into the storage chamber to avoid interference with other coal mining equipment. Attached Figure Description

[0033] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0034] Figure 1A schematic diagram is shown of a coal mining method according to an embodiment of the present invention, in which a hydraulic support is stored in a support storage chamber;

[0035] Figure 2 A schematic diagram of a construction measures roadway in a coal mining method provided according to an embodiment of the present invention is shown;

[0036] Figure 3 A schematic diagram is shown of removing a hydraulic support from a support storage chamber in a coal mining method according to an embodiment of the present invention;

[0037] Figure 4 This diagram illustrates a coal mining operation according to a predetermined crossing slope in an embodiment of the present invention.

[0038] Figure 5 This diagram illustrates a coal mining operation according to another predetermined crossing slope in a coal mining method provided by an embodiment of the present invention.

[0039] Figure 6 A schematic diagram of the operation of retaining 0.5m of top coal when calculating the cross-layer slope is shown in the coal mining method provided according to an embodiment of the present invention;

[0040] Figure 7 A schematic diagram of marker layer intercalation prediction parameters provided according to an embodiment of the present invention is shown;

[0041] Figure 8 A schematic diagram of the measured slope of the top and bottom plates of the working face in a coal mining method provided according to an embodiment of the present invention is shown;

[0042] Figure 9 It shows in Figure 8 A schematic diagram of the installation of hydraulic supports in the middle section;

[0043] Figure 10 This diagram illustrates a coal mining operation from a southern extension of a small face to a northern normal face, provided by an embodiment of the present invention.

[0044] Figure 11 A schematic diagram of the arrangement of the first cut, the second cut, the measures roadway, and the return airway in the coal mining method provided according to an embodiment of the present invention is shown. Detailed Implementation

[0045] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0046] like Figures 1 to 11As shown, an embodiment of the present invention provides a coal mining method for mining corner coal located at the corner of a cutterhead working face. The method includes: excavating a first cut on the side of the cutterhead working face closest to the corner coal, and excavating a second cut on the side of the corner coal furthest from the cutterhead working face; excavating a transport roadway side-continuing face on the cutterhead working face, the transport roadway side-continuing face being located between the first and second cuts, both of which are connected to the transport roadway side-continuing face; and providing a storage chamber at the connection between the first cut and the transport roadway side-continuing face, the storage chamber being located on the side of the first cut and used to store a spare hydraulic support, so that after the device in the transport roadway side-continuing face is removed, the spare hydraulic support can be pushed out of the storage chamber to the connection between the first cut and the transport roadway side-continuing face for support.

[0047] This method, using storage chambers and hydraulic supports, allows for the timely removal of hydraulic supports from the storage chambers after the equipment in the transport roadway side face is dismantled, thereby improving support strength and ensuring operational safety. When coal mining equipment needs to be installed in the transport roadway side face, the hydraulic supports are moved into the storage chambers to avoid interfering with other coal mining equipment.

[0048] Specifically, the storage chamber here corresponds to Figure 1 The support structure is stored in the chamber. The transport roadway corresponds to this. Figure 1 0102 in 1 03 Southern extension of the small van transport roadway, the transport roadway also corresponds to Figure 10 Small transport troughs in the middle.

[0049] In this embodiment, after the device in the side face of the transport roadway is removed, the spare hydraulic support is pushed out of the storage chamber to the connection between the first cut and the side face of the transport roadway for support. This includes: mining the corner coal along the direction from the second cut towards the first cut, and installing a belt conveyor in the side face of the transport roadway; when the distance between the working face and the side face is less than or equal to a first preset distance, the belt conveyor is first removed, and then the spare hydraulic support is pushed out to the connection between the first cut and the side face of the transport roadway. This improves the support strength at the connection point and effectively ensures safe production.

[0050] Specifically, after pushing the spare hydraulic support to the connection point between the first cut and the side face of the transport roadway, the coal mining method further includes: installing a scraper conveyor at the side face of the transport roadway, and pushing the spare hydraulic support back into the storage chamber. This method facilitates the smooth installation of the scraper conveyor and avoids interference from the hydraulic support.

[0051] In this embodiment, after installing a scraper conveyor at the side face of the transport roadway and pushing the spare hydraulic support back into the storage chamber, the coal mining method further includes: after the second cutter connects with the first cutter, removing the scraper conveyor at the side face of the transport roadway and pushing the spare hydraulic support from the storage chamber to the connection point between the first cutter and the side face of the transport roadway. This method effectively improves the structural support strength at the connection point, thereby ensuring safe production in the future.

[0052] Specifically, the coal mining method in this embodiment further includes: when mining along the mining direction from the second cut to the first cut, when the distance between the working face and the first cut is less than or equal to a fourth preset distance, measuring the dip length, upper and lower elevations, and pseudo-inclination of the working face at fifth preset distance intervals, and calculating the change in the length of the working face; marking the specific position of the docking support at the lower opening of the first cut, and installing a position detector at the first cut to control the movement of the scraper conveyor through the detection of the position detector, and docking the upper support of the working face with the lower support of the first cut. This method improves the accuracy of coal mining, ensuring that the support at the upper opening of the working face can smoothly dock with the support at the lower opening of the first cut, thus improving the accuracy of mining.

[0053] In this embodiment, the coal mining method further includes: excavating a measure roadway at one end of the first cut near the return air roadway, the measure roadway being located between the first cut and the return air roadway, and the two ends of the measure roadway being connected to the first cut and the return air roadway respectively.

[0054] Specifically, the coal mining method also includes: setting the construction width of the access roadway as 'a', the support width of the standby hydraulic support as 'b', and the minimum working width of the scraper conveyor as 'c'; ensuring that a, b, and c satisfy the following relationship: a + b ≥ c. This method facilitates the smooth operation of the scraper conveyor.

[0055] In this embodiment, during the mining of corner coal along the direction from the second cut to the first cut, the mining method further includes: when the distance between the working face and the second cut is less than or equal to a second preset distance, using the working face to mine unmarked layers, and controlling the working face to mine layer by layer according to a predetermined cross-layer slope during the mining process, while avoiding the goaf within the cutterhead working face; wherein, the second preset distance is greater than the first preset distance. This method can improve the accuracy of cross-layer mining, avoid mining to the bottom of the goaf, and also avoid mining to locations too far from the goaf, thus preventing the omission of some mining areas. Specifically, the distance between the cross-layer and the goaf can be maintained at 0.5m, i.e., maintaining 0.5m of safe top coal.

[0056] Specifically, in this embodiment, the working face is controlled to mine layer by layer according to a predetermined stratification slope during the mining process. This includes: measuring the current elevation of the working face at every third preset distance, comparing and analyzing the measured current elevation with the elevation of the goaf floor, and determining whether there is a deviation in the working layer position of the working face based on the comparison and analysis results. This method can better improve the accuracy of stratification and facilitate precise directional stratification.

[0057] In this embodiment, during the mining of unmarked layers using the working face, the coal mining method further includes: marking a layer of interbedded rock at the mining location as a marker layer; predicting the extension trend of the interbedded rock based on relevant parameters; measuring the relative position of the interbedded rock within the current mining face; comparing the measured position of the interbedded rock with the predicted extension trend of the interbedded rock; and correcting the mining of the working face based on the comparison results. This method facilitates further improvement in the precise control of cross-layer mining.

[0058] Specifically, such as Figure 2 As shown, a 4.0m wide extension roadway will be constructed between the northern normal face cutting head and the return roadway. A support storage chamber will be built at the intersection of the southern extended face transport roadway and the northern normal face cutting head. A hydraulic support will be pre-installed in the support storage chamber. When the working face begins to continue, the belt conveyor in the transport roadway will be removed, and the pre-installed hydraulic support will be installed at the position where the belt conveyor was removed.

[0059] When the southern extension face is 20m from the continuation face, the transfer machine and belt conveyor will be dismantled and recycled, and a scraper conveyor will be installed. Because a 4.0m wide measure tunnel and an 8m long hydraulic support will be constructed in advance, the total distance is 12m, ensuring the shortest distance for the scraper conveyor to operate normally.

[0060] After the small and large faces of the southern extension are connected, the working face transport scraper conveyor is removed, and the spare hydraulic support in the support storage chamber is pulled back to complete the docking work of the small and large faces.

[0061] When the southern extended face is 60m away from the goaf of the northern normal face, unmarked layer-crossing mining begins. Based on the measured bottom plate profile of the 0102103 working face and the top and bottom plate elevations of the southern extended face, the top and bottom elevations of the corresponding cross-layer supports of the 0102103 working face goaf and the southern extended face are compared and analyzed, and the cross-layer slope is calculated for each. Then, areas with similar cross-layer slope values ​​are grouped together, and the average cross-layer slope of that area is calculated. Finally, the amount of bottoming or leaving per cycle of the working face is determined based on the average cross-layer slope value. Simultaneously, the top and bottom plate elevations of the working face are measured again every 20m and compared with the bottom plate elevation of the goaf to verify the quality of the working face's layer control. If a deviation in layer control is found, the amount of bottoming or leaving per cycle of the working face is corrected and adjusted to ensure that the southern extended face is mined according to the elevation measurement cross-layer slope requirements.

[0062] When the distance from the southern extended face to the goaf (0102103 working face) is 6.4m (8 cycles), the actual measured elevation of the bottom plate of the southern extended face is compared with the elevation of the bottom plate of the normal northern face (0102203) to calculate the cross-layer slope. To ensure the safe passage of the southern extended face through the goaf, 0.5m of top coal is retained when calculating the cross-layer slope. Every 10m within the southern extended face, at a position raised 2m from the bottom plate elevation, boreholes are drilled towards the goaf according to the calculated cross-layer slope. After drilling, PVC pipes filled with quicklime are used for filling. When the coal mining machine cuts coal, the quicklime inside the PVC pipes is exposed. The height of the exposed quicklime from the top and bottom plates of the working face is used to control the amount of top and bottom lifting by the coal mining machine, achieving precise control of the strata when the working face is connected.

[0063] During the cross-layer mining stage of the working face, a layer of interbedded rock will be exposed. This interbedded rock is relatively stable and will be used as a marker layer. Based on the exploration line boreholes, exploration line profiles, and relevant geological data, the trend of the interbedded rock's extension is predicted. The corresponding positions of the exposed interbedded rock on the working face are measured daily using a measuring tape, and compared with the predicted data of the marker layer interbedded rock. This comparison is used to verify the quality of the stratigraphic control guided by long-distance macroscopic elevation measurement.

[0064] The 0102103 working face is excavating along the roof of the second and third coal seams. Due to the unevenness of the roof of the second and third coal seams, the floor of the goaf in the 0102103 working face is also uneven. To ensure the safe passage of the southern extension face through the goaf, the undulation of the roof and floor of the southern extension face must be the same as that of the goaf floor. When the southern extension face is 10m from the stop line, a reference line with the same undulation as the goaf floor is laid on the support of the southern extension face every two days, based on the measured undulation of the goaf floor. The difference between the undulation of the working face roof and the goaf floor is compared and analyzed to verify the quality of the stratum control through long-distance macroscopic guidance of elevation measurement and precise positioning by close-range drilling.

[0065] Within a 30m radius of the northern normal face, the dip length (horizontal distance) of the working face is measured every 10m. Parameters such as the elevation of the upper and lower edges of the working face and the pseudo-inclination are used, and trigonometric functions are employed to accurately calculate the changes in the working face length. The specific location of the docking support is marked at the lower edge of the cutting eye on the northern normal face, and a laser pointer is installed. The scraper conveyor on the working face is controlled according to the position indicated by the laser pointer to ensure accurate docking between the upper edge support of the southern extension face and the lower edge support of the cutting eye on the northern normal face.

[0066] In this invention, a 4.0m wide extension roadway is constructed along the northern normal face cutting face to connect with the return roadway. A support storage chamber is located at the intersection of the southern extension face transport roadway and the northern normal face cutting face, ensuring normal connection between the southern extension face and the northern face after the southern extension face reaches its next face position. A comprehensive stratigraphic control method is employed, utilizing long-distance macroscopic guidance via elevation measurement, precise positioning via close-range drilling, and stratigraphic verification using marker rock inclusions and auxiliary reference lines for the working face. This ensures that the southern extension face passes under a single layer of goaf in the northern normal face. Within a 30m radius of the northern normal face, the dip length (horizontal distance) of the working face is measured every 10m. Parameters such as the elevation of the upper and lower edges of the working face and the pseudo-inclination are used, and trigonometric relationships are used to accurately calculate the changes in the working face length. Mark the specific location of the docking support below the normal large-face incision in the north, and install a laser pointer. Control the scraper conveyor on the working face to move up and down according to the position indicated by the laser pointer to ensure accurate docking between the support at the top of the extended small face in the south and the support at the bottom of the normal large-face incision in the north.

[0067] From the above description, it can be seen that the above embodiments of the present invention solve the following technical problems: In the continuous mining of the transport side, the 1.5m space occupied by the belt conveyor in the small face transport side makes it impossible to install supports. During the continuous mining, there is a 1.5m gap between the upper and lower supports, posing a safety hazard to the working face. Simultaneously, when the distance between the southern extended small face and the northern normal large face reaches the minimum size for the transfer machine and belt conveyor, the equipment cannot operate normally, and the southern extended small face cannot be connected to the large face. In the joint mining of the southern extended small face and the northern normal large face at different strata, the working face lacks a marker layer for cross-layer mining, making it impossible to accurately pass through the goaf. Using a "knife handle" arrangement for the fully mechanized mining face forms two openings, which requires that when the lower opening of the fully mechanized mining face advances to the upper opening, it can successfully connect with the supports pre-installed in the upper opening. The above-described embodiments of the present invention achieve the following technical effects: By utilizing existing production systems and equipment to mine marginal coal, the resource recovery rate is improved, resulting in the recovery of an additional 569,600 tons of coal resources. This enables the precise and thorough mining of precious and scarce Taixi anthracite, extending the service life of the working face and significantly alleviating the tight mine continuity situation. Through optimizing the layout of working face roadways, rationally matching working face transportation equipment, and applying precise working face docking technology, safe, rapid, and efficient docking of the working face is achieved. This ensures the continuity of working face production, greatly improves the working face's production capacity, and effectively reduces the 10,000-ton tunneling rate. It also ensures the safety of personnel and equipment under difficult conditions.

[0068] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0069] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0070] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0071] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0072] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0073] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A coal mining method, characterized in that, The coal mining method is used to extract corner coal, which is located at the corner of the cutterhead working face; the coal mining method includes: A first cutting hole is excavated on the side of the cutting tool working face closest to the corner coal, and a second cutting hole is excavated on the side of the corner coal away from the cutting tool working face. The working face of the cutter handle is used to excavate the side continuation surface of the transport roadway, which is located between the first cut and the second cut, and both the first cut and the second cut are connected to the side continuation surface of the transport roadway. A storage chamber is provided at the connection between the first cut and the side continuation surface of the transport roadway. The storage chamber is located on the side of the first cut and is used to store a spare hydraulic support. After the device in the side continuation surface of the transport roadway is removed, the spare hydraulic support is pushed out from the storage chamber to the connection between the first cut and the side continuation surface of the transport roadway for support. After the device in the side continuation surface of the transport roadway is removed, the spare hydraulic support is pushed out of the storage chamber to the connection between the first cut and the side continuation surface of the transport roadway for support, including: The corner coal is mined along the second cut towards the first cut, and a belt conveyor is installed in the side face of the transport roadway. When the distance between the working face and the continuation face is less than or equal to the first preset distance, the belt conveyor is first removed, and then the spare hydraulic support is pushed out to the connection between the first cut and the side continuation face of the transport roadway. After the backup hydraulic support is then pushed out to the point where the first cut and the side face of the transport roadway connect, the coal mining method further includes: A scraper conveyor is installed at the side continuation of the transport roadway, and the spare hydraulic support is pushed back into the storage chamber; After installing a scraper conveyor at the side face of the transport roadway and pushing the spare hydraulic support back into the storage chamber, the coal mining method further includes: After the second cut is connected to the first cut, the scraper conveyor at the side continuation surface of the transport roadway is removed, and the spare hydraulic support is pushed out of the storage chamber to the connection point between the first cut and the side continuation surface of the transport roadway.

2. The coal mining method according to claim 1, characterized in that, The coal mining method also includes: When mining along the mining direction from the second cut to the first cut, when the distance between the working face and the first cut is less than or equal to a fourth preset distance, the dip length, the upper and lower elevations of the working face, and the pseudo-inclination are measured every fifth preset distance, and the change in the length of the working face is calculated. The specific position of the docking bracket is marked at the lower opening of the first cut, and a position detector is installed at the first cut to control the movement of the scraper conveyor through the detection of the position detector, so as to dock the upper support of the working surface with the lower support of the first cut.

3. The coal mining method according to claim 1, characterized in that, The coal mining method also includes: A measure roadway is excavated at one end of the first cut near the return air roadway. The measure roadway is located between the first cut and the return air roadway, and its two ends are respectively connected to the first cut and the return air roadway.

4. The coal mining method according to claim 3, characterized in that, The coal mining method also includes: Let the construction width of the tunnel be 'a', the support width of the backup hydraulic support be 'b', and the minimum working width of the scraper conveyor be 'c'; so that a, b, and c satisfy the following relationship: a+b≥c.

5. The coal mining method according to claim 1, characterized in that, During the process of mining the corner coal along the second cut towards the first cut, the mining method further includes: When the distance between the working face and the second cut is less than or equal to the second preset distance, the working face is used to carry out unmarked layer mining, and the working face is controlled to carry out layer-by-layer mining according to the predetermined layer-penetrating slope during the mining process, while avoiding the goaf area in the cutterhead working face. Wherein, the second preset distance is greater than the first preset distance.

6. The coal mining method according to claim 5, characterized in that, Controlling the working face to mine layer by layer according to a predetermined cross-layer slope during the mining process includes: At every third preset distance, the current elevation of the working face is measured, and the measured current elevation is compared and analyzed with the elevation of the goaf floor. Based on the comparison and analysis results, it is determined whether there is a deviation in the working layer of the working face.

7. The coal mining method according to claim 5, characterized in that, During the mining of unmarked seams using the aforementioned working face, the coal mining method further includes: A layer of interbedded rock at the mining site is marked as a marker layer, and the extension trend of the interbedded rock is predicted based on the relevant parameters of the interbedded rock. The relative position of the interbedded rock within the current excavation face is measured, and the measured position of the interbedded rock is compared with the predicted extension trend of the interbedded rock, so as to correct the mining of the working face based on the comparison results.

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