Temporary supporting device and method for coal mine

Abstract

The invention relates to the technical field of roadway supporting, and discloses a temporary supporting device for a coal mine and a supporting method.The temporary supporting device is characterized in that a pair of bottom plates are arranged on the ground of a roadway in parallel; the supporting rod assembly comprises a plurality of first supporting rods, a plurality of second supporting rods and a plurality of third supporting rods, and the first supporting rods, the second supporting rods and the third supporting rods can stretch out and draw back through the hydraulic driving system. The supporting beam assembly comprises a pair of first supporting beams with inclined plate structures and a second supporting beam with an arc-shaped structure, the pair of first supporting beams are parallel to the pair of bottom plates in the height direction, and the second supporting beam is located between the pair of first supporting beams; the reel type protective net is contained in the bottom plate and can be pulled out to cover the supporting assemblies and the supporting beam assemblies, a comprehensive, efficient and safe comprehensive solution is provided for solving the long-term existing pain points in underground coal mine roadway supporting, the technical and economic benefits are remarkable, and the application and popularization prospects are wide.

Description

Technical Field

[0001] This invention relates to the field of tunnel support technology, and in particular to a temporary support device and support method for coal mines. Background Technology

[0002] In underground coal mining, tunnel support is a crucial element in ensuring safe underground operations and maintaining the stability of the surrounding rock. Traditional tunnel support methods mainly rely on timber and concrete supports, but these methods have many limitations. Timber supports exhibit significant variations in load-bearing capacity, greatly influenced by the type of wood and its moisture content. Their supporting capacity is limited and unpredictable, and they are prone to decay in humid environments, resulting in rapid strength loss and a short service life. While concrete supports can provide high support strength, the components are extremely heavy, making handling, transportation, and installation extremely difficult. Furthermore, they have poor adhesion to the surrounding rock, leading to unsatisfactory initial support effects. Existing adjustable support devices, such as support frames that use hydraulic cylinders or mechanical screws for height adjustment, have improved the support effect to some extent, but still have problems such as poor adaptability, single function, complex installation process, limited adjustability and poor stability. They cannot fully meet the needs of efficient, safe and highly adaptable modern mining. Especially in deep, high-stress, extremely soft coal roadways, the surrounding rock has poor integrity, low strength and weak self-bearing capacity, the coal body is loose and prone to collapse, and roof leakage occurs frequently. Conventional machine-mounted temporary support or single-pillar support is difficult to provide effective support, roof control is extremely difficult, and there are significant safety hazards.

[0003] Therefore, there is an urgent need for an innovative support device that can adapt to extremely soft surrounding rock, be installed quickly, and provide reliable temporary support. Summary of the Invention

[0004] The purpose of this invention is to provide a temporary support device and support method for coal mines, aiming to solve or improve at least one of the above-mentioned technical problems.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention provides a temporary support device for coal mines, comprising: A pair of base plates, set parallel to each other on the tunnel floor; The support rod assembly includes several first support rods, several second support rods, and several third support rods, wherein the first support rods, second support rods, and third support rods are capable of telescopic movement via a hydraulic drive system; The support beam assembly includes a pair of first support beams with inclined plate structures and a second support beam with an arc structure. The pair of first support beams are parallel to the pair of base plates in the height direction, and the second support beam is located between the pair of first support beams. A roll-up protective net is stored inside the base plate and can be pulled out to cover the support assembly and the support beam assembly; Wherein, at least two first support rods and at least two second support rods are detachably connected between the base plate and the first support beam, so that a spatial multi-triangular support unit is formed between the base plate, the first support beam, the first support rods and the second support rods, and at least two third support rods are detachably connected between the first support beam and the second support beam.

[0006] Optionally, a first slot is provided on the base plate, a second slot is provided on the first support beam, and the two ends of the first support rod are respectively connected to the first slot and the second slot via plugs.

[0007] Optionally, a third slot is provided on the base plate, a fourth slot is provided on the first support beam, and the two ends of the second support rod are respectively connected to the third slot and the fourth slot via plugs.

[0008] Optionally, the second support rod is locked to the base plate and the first support beam by bolts. The third slot is provided with a first limiting hole corresponding to the bolt, and the fourth slot is provided with a second limiting hole corresponding to the bolt. The two ends of the second support rod are respectively provided with through holes that cooperate with the first limiting hole and the second limiting hole for bolt insertion.

[0009] Optionally, the first support beam is provided with a first connecting device with a third limiting hole, the second support beam is provided with a second connecting device with a fourth limiting hole, and the third support rod has pin holes at both ends that cooperate with the third limiting hole and the fourth limiting hole.

[0010] Optionally, the bottom of the base plate is provided with an anti-slip rubber layer.

[0011] Optionally, one of the base plates has a receiving space with a side cover, and the receiving space contains the roll-type protective net.

[0012] Optionally, the base plate is provided with a fifth limiting hole, and the end of the shaft of the roll-type protective net is provided with an end plate. The end plate is provided with a plurality of sixth limiting holes corresponding to the positions of the fifth limiting hole in the circumferential direction. Bolts are inserted between the fifth limiting hole and the sixth limiting hole.

[0013] Optionally, the roll-type protective net adopts a double-layer composite structure, with an outer layer of high-strength steel wire mesh and an inner layer of buffer foam.

[0014] The present invention also provides a method for temporary support in coal mines, comprising the following steps: Clean the installation area in the tunnel and place the base plate; Install the first support rod and the second support rod onto the base plate; The hydraulic drive system is activated to lift the first support rod, and then the first support beam is installed to form a stable triangular support structure. Unroll and secure the roll-type protective net to form a safety protection layer; Install the second support beam, and drive the third support rod through the hydraulic drive system to adjust its inclination and height, so that the second support beam fits tightly against the roadway roof. The load is transferred through the hydraulic drive system, so that the second support rod participates in bearing the load, completing the installation and entering the working state; After the tunnel has been excavated a certain distance, the above steps are repeated at the new working face to install the next set of the temporary support device for coal mines.

[0015] This invention discloses the following technical effects: The temporary support device for coal mines of this invention, through its modular, adjustable, self-protective, and functionally integrated design, can quickly adapt to roadways of different heights and cross-sectional shapes, and fit tightly against the roof, significantly improving support effectiveness and safety. The built-in all-around protection design effectively intercepts falling debris from the roof and walls during construction, ensuring the safety of equipment and personnel below. The modular design and quick-connect structure make the installation process as simple and intuitive as assembling building blocks, greatly shortening installation time and improving work efficiency. The design that simultaneously completes support and reinforcement significantly reduces the exposure time of personnel in insufficiently supported hazardous areas, improving work safety. The multi-redundant support system and rigid mechanical interlocking design enhance the overall stability and long-term reliability of the device. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the base plate structure of the present invention; Figure 3 This is a bottom view of the first support beam structure of the present invention; Figure 4 This is a bottom view of the second support beam structure of the present invention; Figure 5 This is a schematic diagram of the roll-type protective net structure of the present invention; Figure 6 This is a schematic diagram of the first support rod structure of the present invention; Figure 7 This is a schematic diagram of the second support rod structure of the present invention; Figure 8 This is a schematic diagram of the structure of the base plate for fixing the end of the roll-type protective net according to the present invention; Figure 9 This is a set of illustrations demonstrating the alternating advancement of the present invention; Figure 10 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0017] In the diagram: 1. First support rod; 2. Second support rod; 3. Third support rod; 4. Base plate; 5. Roll-up protective net; 6. First support beam; 7. Second support beam; 8. First slot; 9. Third slot; 10. Side cover; 11. Anti-slip rubber layer; 12. First limiting hole; 13. Fifth limiting hole; 14. Fourth slot; 15. Second slot; 16. Third limiting hole; 17. First connecting device; 18. Second limiting hole; 19. Fourth limiting hole; 20. Second connecting device; 21. Sixth limiting hole; 22. Fixing bolt hole; 23. Protruding tooth. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Example 1, referring to Figures 1 to 9 This invention provides a temporary support device for coal mines, comprising: A pair of base plates 4 are set parallel to each other on the tunnel floor; The support rod assembly includes several first support rods 1, several second support rods 2, and several third support rods 3. The first support rods 1, second support rods 2, and third support rods 3 can extend and retract via a hydraulic drive system. The main function of the first support rods 1 is to bear most of the vertical load of the roof and to achieve precise and rapid adjustment of the device height through the hydraulic system. The second support rods 2 greatly enhance the device's resistance to lateral forces and overall stability. By extending and retracting the third support rods 3, the inclination angle and height of the second support beam 7 can be adjusted so that it can perfectly fit the roadway roof with different curvatures. The support beam assembly includes a pair of first support beams 6 with inclined plate structures and a second support beam 7 with arc structures. The pair of first support beams 6 are parallel to a pair of base plates 4 in the height direction, and the second support beam 7 is located between the pair of first support beams 6. The roll-up protective net 5 is stored inside the base plate 4 and can be pulled out to cover the support components and support beam components; Among them, at least two first support rods 1 and at least two second support rods 2 are detachably connected between the base plate 4 and the first support beam 6, so that the base plate 4, the first support beam 6, the first support rods 1 and the second support rods 2 form a spatial multi-triangular support unit, and at least two third support rods 3 are detachably connected between the first support beam 6 and the second support beam 7.

[0021] In one embodiment of the present invention, a first slot 8 is provided on the base plate 4, a second slot 15 is provided on the first support beam 6, and the two ends of the first support rod 1 are respectively connected to the first slot 8 and the second slot 15 via plugs.

[0022] The first slot 8 and the second slot 15 are fitted with the plugs at both ends of the first support rod 1 with a clearance. Through the slot-type connection of the first slot 8 and the second slot 15, the first support rod 1 is quickly and accurately positioned and installed with the base plate 4 and the first support beam 6, which greatly simplifies the assembly process and reduces the dependence on the operator's skills.

[0023] In one embodiment of the present invention, a third slot 9 is provided on the base plate 4, a fourth slot 14 is provided on the first support beam 6, and the two ends of the second support rod 2 are respectively connected to the third slot 9 and the fourth slot 14 via plugs.

[0024] The connection method of the second support rod 2 was further clarified to ensure that it can immediately participate in load bearing after installation, form a stable triangular support structure, and enhance the overall resistance to lateral forces.

[0025] In one embodiment of the present invention, the second support rod 2 is locked to the base plate 4 and the first support beam 6 by bolts. The third slot 9 is provided with a first limiting hole 12 corresponding to the bolt, and the fourth slot 14 is provided with a second limiting hole 18 corresponding to the bolt. The two ends of the second support rod 2 are respectively provided with through holes that cooperate with the first limiting hole 12 and the second limiting hole 18 for bolt insertion.

[0026] A rigid interlocking mechanism consisting of bolts, first limiting hole 12, second limiting hole 18, and through hole is adopted to prevent the second support rod 2 from coming off or loosening after being subjected to force, thereby improving the connection reliability and structural stability during long-term use.

[0027] In one embodiment of the present invention, a first connecting device 17 with a third limiting hole 16 is provided on the first supporting beam 6, a second connecting device 20 with a fourth limiting hole 19 is provided on the second supporting beam 7, and pin holes that cooperate with the third limiting hole 16 and the fourth limiting hole 19 are respectively opened at both ends of the third supporting rod 3.

[0028] By using a pin shaft to connect the first connecting device 17, the second connecting device 20, the third limiting hole 16, the fourth limiting hole 19, and the pin shaft hole, the angle and height of the second support beam 7 can be finely adjusted, so that it can better fit the contour of the roadway roof, while ensuring a firm connection.

[0029] In one embodiment of the present invention, an anti-slip rubber layer 11 is provided on the bottom of the base plate 4.

[0030] The anti-slip rubber layer 11 enhances the friction between the base plate 4 and the roadway floor, preventing the support device from sliding under vibration or lateral force, and improving the static stability of the support.

[0031] In one embodiment of the present invention, a receiving space with a side cover 10 is provided on the side of one of the base plates 4, and a roll-type protective net 5 is provided in the receiving space.

[0032] The roll-type protective net 5 is integrated inside the base plate 4, which does not occupy additional transportation and storage space, realizing the "on-demand" protection function and improving the timeliness of safety response.

[0033] When installing the roll-type protective net 5, pull it out from one side of the base plate 4, upwards and around the entire side and top of the support device, and finally fix the end to the other side of the base plate 4. This design can effectively prevent the falling of broken rocks from the top plate and both sides, protecting the equipment and personnel below.

[0034] Furthermore, on the other side of the base plate 4, there are multiple fixing bolt holes 22, and the ends of the roll-type protective net 5 are provided with a corresponding number of through holes. The ends of the roll-type protective net 5 are locked and fixed to the base plate 4 by the cooperation of the long bolts, fixing bolt holes 22 and through holes on the roll-type protective net 5.

[0035] In one embodiment of the present invention, a fifth limiting hole 13 is provided on the base plate 4, and an end plate is provided at the end of the shaft of the roll-type protective net 5. The end plate is provided with a plurality of sixth limiting holes 21 corresponding to the positions of the fifth limiting hole 13 in the circumferential direction. Bolts are inserted between the fifth limiting hole 13 and the sixth limiting holes 21.

[0036] By using bolts to engage the fifth limiting hole 13 and the sixth limiting hole 21, the roll-type protective net 5 can be quickly fixed and its tension adjusted after being pulled out, ensuring that the roll-type protective net 5 tightly covers the support area without loosening or sagging.

[0037] In one embodiment of the present invention, the roll-type protective net 5 adopts a double-layer composite structure. The outer layer is a high-strength steel wire mesh layer to resist impact, and the inner layer is a buffer foam layer to buffer and absorb energy and reduce the kinetic energy of falling rocks.

[0038] The double-layer composite protective netting combines high-strength impact resistance with buffering and energy absorption functions, significantly reducing the risk of injury to personnel and equipment below from falling rocks and improving the level of safety protection.

[0039] Furthermore, the hydraulic drive system is a centrally controlled system that provides power to the first support rod 1, the second support rod 2, and the third support rod 3. The system is preferably equipped with both electric and manual pump modes to ensure that emergency lifting and lowering operations can still be performed by hand in the event of a power outage underground, thereby improving the reliability of the device.

[0040] Furthermore, in specific application scenarios, the first support rod 1, the second support rod 2, and the third support rod 3 can be replaced with mechanical spiral telescopic rods. Although the adjustment speed is slower, the cost may be lower.

[0041] Furthermore, the material for the roll-type protective net 5 can also be a new type of material such as high-strength polymer net.

[0042] Furthermore, for applications requiring quick assembly and disassembly, the limit holes and plugs can be designed with quick-locking mechanisms such as eccentric wheels or pins.

[0043] Furthermore, in this embodiment, a single support device includes a pair of base plates 4, four first support rods 1, four second support rods 2, four third support rods 3, a pair of first support beams 6, and a second support beam 7.

[0044] The present invention also provides a method for temporary support in coal mines, comprising the following steps: Clean the installation area in the tunnel and place the base plate 4; Install the first support rod 1 and the second support rod 2 onto the base plate 4. Specifically, insert the bottom end of the first support rod 1 into the first slot 8 of the base plate 4, and insert the bottom end of the second support rod 2 into the third slot 9 of the base plate 4 for initial fixation. Start the hydraulic drive system to lift the first support rod 1, and then install the first support beam 6 to form a stable triangular support structure. Specifically, insert the top of the first support rod 1 into the second slot 15 of the first support beam 6, insert the top of the second support rod 2 into the fourth slot 14 of the first support beam 6, and then fix the second support rod 2 with bolts. Unroll and fix the roll-type protective net 5 to form a safety protection layer. Specifically, pull out the roll-type protective net 5 from one side of the base plate 4, so that it wraps around the entire device and is fixed on the other side of the base plate 4. Install the second support beam 7, and drive the third support rod 3 through the hydraulic drive system to adjust its inclination and height so that the second support beam 7 fits tightly against the roadway roof. The load is transferred through the hydraulic drive system, so that the second support rod 2 can participate in the load-bearing, and the installation is completed and the machine enters the working state. After the tunnel has been excavated a certain distance, the above steps are repeated at the new working face to install the next set of a temporary support device for coal mines.

[0045] This invention achieves precise three-dimensional adjustment of the support device in terms of height and inclination angle by controlling the height of the main body with the first support rod 1 and adjusting the posture of the second support beam 7 with the third support rod 3. This allows the device to quickly adapt to changes in the cross-sectional dimensions and roof undulations of the tunnel under different tunneling stages and geological conditions, ensuring that the first support beam 6 and the second support beam 7 can achieve large-area, tight contact with the tunnel roof and sides, effectively avoiding stress concentration caused by point or line contact, and evenly distributing the roof pressure, greatly improving the support effect and safety. This is a revolutionary improvement over fixed-size or simply adjustable support devices.

[0046] This invention integrates a roll-type protective net 5 inside the base plate 4. After the support is installed, the protective net can be quickly pulled out and fixed around the base plate, immediately forming a continuous physical barrier above and to the sides of the support space. This design transforms passive protection into active integrated protection, effectively intercepting debris that may fall from the roof and walls during construction, fundamentally ensuring the safety of equipment and personnel below.

[0047] The preferred double-layer protective netting structure of this invention (steel wire mesh layer + buffer foam layer) not only has high strength to resist impact, but also has good buffering and energy absorption performance, further reducing the risk of falling rocks. This function is completely absent in traditional support systems and most existing adjustable support devices, representing an upgrade in support safety concepts.

[0048] The device of this invention adopts a fully modular design, with each component (support rod, base plate, top beam) connected to the others via slots and limiting holes and bolts. This "mortise and tenon-locking" structure makes the installation process as simple and intuitive as assembling building blocks, significantly reducing reliance on operator skills and shortening installation time.

[0049] This invention utilizes the second support rod 2, which is arranged in conjunction with the first support rod 1 during the initial installation stage. The installation process naturally forms a stable triangular support frame. This means that the support work and stability reinforcement work are completed simultaneously, completely eliminating the cumbersome secondary process of "support first, then reinforce," significantly reducing the exposure time of personnel in insufficiently supported hazardous areas, and simultaneously improving work efficiency and safety.

[0050] All key connection points in this invention employ a rigid interlocking method with bolts passing through limiting holes, ensuring a firm and reliable connection. This avoids loosening and slippage that may occur under complex dynamic load environments downhole, thus ensuring the long-term effectiveness of the support.

[0051] Load distribution: By slightly depressurizing after installation to allow the second support rod 2 to participate in load-bearing, most of the constant load is shared by all the support rods, while the hydraulic system mainly handles dynamic loads and adjustments. This reduces the long-term load on the hydraulic system, lowers the failure rate, and also takes advantage of the good stability of the rigid structure.

[0052] Because of its modular design and bolted connections, this invention allows for easy and complete disassembly of the entire device, enabling it to be transported to new work sites for repeated assembly and use. This significantly improves material utilization, meeting the requirements of green mining and cost reduction.

[0053] As attached Figure 2 As shown, this invention inherently supports an alternating cyclical operation mode of "installing forward and retrieving backward." During continuous tunnel excavation, new support units can be installed forward, and then the support units that have passed through the pressure stabilization zone can be dismantled and retrieved for installation further forward. After the rear support units are retrieved, the workers and the tunneling process move forward, leaving sufficient space for the construction of permanent supports in areas where there are currently no temporary supports. This mode allows the support to closely follow the tunneling face, achieving an efficient, continuous, and safe production cycle.

[0054] The upper support structure design of the device of the present invention (such as below the second support beam 6) naturally creates an open and unobstructed space. This provides an ideal location for laying out the necessary ventilation ducts, water supply pipelines, drainage pipes, dust suppression spray systems, cables and communication lines in the mine, making the use of roadway space more rational and tidy, and improving the underground working environment.

[0055] In summary, this invention, through its innovative modular, adjustable, self-protective, and integrated design, successfully combines multiple advantages such as high-strength support, efficient installation, active safety, space optimization, and recyclability. It provides a comprehensive, efficient, and safe integrated solution to address the long-standing pain points in underground coal mine roadway support, with significant technical and economic benefits and broad prospects for promotion and application.

[0056] Example 2, refer to Figure 10 As shown, the difference between this embodiment and embodiment 1 is that both base plates 4 are provided with receiving spaces with side cover 10. One receiving space is provided with a roll-type protective net 5, and the other receiving space is provided with a shaft and end plate with the same structure as the roll-type protective net 5. The shaft is provided with a row of protruding teeth 23, which can engage the end plane of the roll-type protective net 5 with the protruding teeth 23. After engaging, rotate half a turn and then use the fifth limiting hole 13, the sixth limiting hole 21 and the bolt position to fix the extension length of the roll-type protective net 5.

[0057] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to 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 of this invention.

[0058] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A temporary support device for coal mines, characterized in that, include: A pair of base plates (4) are set parallel to the roadway floor; The support rod assembly includes several first support rods (1), several second support rods (2), and several third support rods (3), wherein the first support rods (1), the second support rods (2), and the third support rods (3) are capable of telescopic movement via a hydraulic drive system; The support beam assembly includes a pair of first support beams (6) with inclined plate structures and a second support beam (7) with arc-shaped structures. The pair of first support beams (6) are parallel to the pair of bottom plates (4) in the height direction, and the second support beam (7) is located between the pair of first support beams (6). A roll-up protective net (5) is stored inside the base plate (4) and can be pulled out to cover the support assembly and the support beam assembly; Among them, at least two first support rods (1) and at least two second support rods (2) are detachably connected between the base plate (4) and the first support beam (6), so that a spatial multi-triangular support unit is formed between the base plate (4), the first support beam (6), the first support rod (1) and the second support rod (2), and at least two third support rods (3) are detachably connected between the first support beam (6) and the second support beam (7).

2. A temporary support device for coal mines according to claim 1, characterized in that, The base plate (4) has a first slot (8) and the first support beam (6) has a second slot (15). The two ends of the first support rod (1) are respectively connected to the first slot (8) and the second slot (15) through plugs.

3. A temporary support device for coal mines according to claim 1, characterized in that, The base plate (4) has a third slot (9) and the first support beam (6) has a fourth slot (14). The two ends of the second support rod (2) are respectively connected to the third slot (9) and the fourth slot (14) via plugs.

4. A temporary support device for coal mines according to claim 3, characterized in that, The second support rod (2) is locked to the base plate (4) and the first support beam (6) by bolts. The third slot (9) is provided with a first limiting hole (12) corresponding to the bolt, and the fourth slot (14) is provided with a second limiting hole (18) corresponding to the bolt. The two ends of the second support rod (2) are respectively provided with through holes that cooperate with the first limiting hole (12) and the second limiting hole (18) for bolt insertion.

5. A temporary support device for coal mines according to claim 1, characterized in that, The first support beam (6) is provided with a first connecting device (17) with a third limiting hole (16), and the second support beam (7) is provided with a second connecting device (20) with a fourth limiting hole (19). The third support rod (3) has pin holes at both ends that cooperate with the third limiting hole (16) and the fourth limiting hole (19).

6. A temporary support device for coal mines according to claim 1, characterized in that, The bottom of the base plate (4) is provided with an anti-slip rubber layer (11).

7. A temporary support device for coal mines according to claim 1, characterized in that, One of the base plates (4) has a receiving space with a side cover (10) on its side, and the receiving space is provided with the roll-type protective net (5).

8. A temporary support device for coal mines according to claim 1, characterized in that, The base plate (4) is provided with a fifth limiting hole (13), and the shaft end of the roll-type protective net (5) is provided with an end plate. The end plate is provided with a plurality of sixth limiting holes (21) corresponding to the position of the fifth limiting hole (13) in the circumferential direction. Bolts are inserted between the fifth limiting hole (13) and the sixth limiting hole (21).

9. A temporary support device for coal mines according to claim 1, characterized in that, The roll-type protective net (5) adopts a double-layer composite structure, with the outer layer being a high-strength steel wire mesh layer and the inner layer being a buffer foam layer.

10. A method for temporary support in coal mines, based on a temporary support device for coal mines as described in any one of claims 1-9, characterized in that, Includes the following steps: Clean the installation area of ​​the tunnel and place the base plate (4); Install the first support rod (1) and the second support rod (2) onto the base plate (4); Start the hydraulic drive system to lift the first support rod (1), and then install the first support beam (6) to form a stable triangular support structure; Unroll and secure the roll-type protective net (5) to form a safety protection layer; Install the second support beam (7), and drive the third support rod (3) through the hydraulic drive system to adjust its inclination and height so that the second support beam (7) fits tightly against the roadway roof; The load is transferred through the hydraulic drive system, so that the second support rod (2) participates in the load-bearing, and the installation is completed and the working state is entered. After the tunnel has been excavated a certain distance, the above steps are repeated at the new working face to install the next set of the temporary support device for coal mines.

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