A warning device for coal mines

Abstract

The utility model provides a kind of warning device for coal mine, it is related to warning device technical field.A kind of warning device for coal mine, including support column, support column upper side is equipped with retraction device, retraction device is rotatably equipped with retraction shaft, retraction shaft is connected with flexible identification element, flexible identification element free end is equipped with counterweight, it is equipped with multiple intervally arranged warning sign unit element on flexible identification element, support column lower side is equipped with receiving device relative to retraction device, receiving device is rotatably equipped with receiving shaft, counterweight and receiving shaft are detachably connected.The different warning sign unit element on flexible identification element in the warning device for coal mine can be quickly replaced, so that the warning device can quickly switch warning sign, reduce the situation without identification time period;While the warning device has greater warning sign, it occupies relatively smaller storage space, ensures warning effect while reducing the hindrance of warning sign to personnel passage.

Description

Technical Field

[0001] This utility model relates to the field of warning device technology, and more specifically, to a warning device for coal mines. Background Technology

[0002] Warning signs constitute a large proportion of coal mine safety devices and are commonly used, including reflective signs and LED displays, to indicate escape routes, hazardous areas, or equipment status. Equipment status warning signs are crucial for ensuring safe production in coal mines and preventing accidents caused by equipment malfunctions. Clear visual cues can quickly convey equipment operating status, maintenance needs, and hazard information, enhancing the safety awareness of on-site personnel. Traditional equipment status warning signs are ineffective if too small, and cumbersome and labor-intensive to replace if too large. Failure to update signs after status changes can lead to misunderstandings and render them meaningless; furthermore, disassembly and relocation are extremely inconvenient.

[0003] A coal mine safety warning sign with a foldable storage structure is disclosed in patent number CN216999403U. Through the coordinated design of a storage device, a lifting structure, and a display device, the folding and lifting function of the lifting structure allows the warning sign to be folded and stored when its position needs to be changed or after use, saving space and making it easy to move. While the replacement and storage angles of this warning device are innovative, although it folds to a certain degree, it still occupies some space and obstructs worker passage. When not in use, it can only be stored away, and when needed, workers must first find the warning device, which is very inconvenient. Furthermore, coal mine equipment has many statuses and requires rapid communication of equipment operating status, maintenance needs, and hazard information. When equipment problems are discovered, personnel need to search for the warning device, and the search gaps can easily lead to periods without warning signs, creating safety loopholes. Utility Model Content

[0004] In order to solve the safety hazards caused by the changing status and placement of current warning devices, this utility model provides a warning device for coal mines.

[0005] The embodiments of this utility model are implemented as follows: A warning device for coal mines includes a support column, a retractable device on the upper side of the support column, a retractable shaft rotatably mounted inside the retractable device, a flexible marker connected to the retractable shaft, a counterweight at the free end of the flexible marker, and multiple warning marker units spaced apart on the flexible marker. A receiving device is located on the lower side of the support column opposite the retractable device, a receiving shaft rotatably mounted inside the receiving device, and the counterweight is detachably connected to the receiving shaft.

[0006] Compared to other warning devices in existing technologies, this design saves more space. When equipment malfunctions, personnel do not need to search for warning signs, thus preventing dangerous situations. In the absence of personnel, different safety signs can be changed and adjusted as needed, making it more convenient and faster to quickly convey equipment operating status, maintenance requirements, and hazard information, thereby improving the safety awareness of on-site personnel.

[0007] In some technical solutions of this utility model, the support column is provided with a control cavity, and a central processing unit is provided in the control cavity. The retracting device and the receiving device are both electrically connected to the central processing unit.

[0008] In this design, the central processing unit controls the operation of the first and second drive motors, resulting in more accurate control of speed and start-up.

[0009] In some technical solutions of this utility model, the above-mentioned retracting device, the above-mentioned supporting column and the above-mentioned receiving device are connected in sequence and arranged in a C-shape, and the supporting column is provided with a limiting channel for the passage of the flexible marking piece.

[0010] This design makes good use of the length of the extension and receiving devices to allow the flexible signs to display warnings. At the same time, a limiting channel is opened in the support column so that when the flexible signs are in operation, part of them are located inside the support column. This provides the flexible signs with some support on the side, making them more stable.

[0011] In some technical solutions of this utility model, the receiving shaft is provided with a placement groove, and multiple locking blocks are arranged at intervals in the placement groove. The counterweight includes a first counterweight rod, and the first counterweight rod is provided with a locking groove that engages with the locking block.

[0012] In this design, the installation and disassembly of the counterweight and the bearing shaft are more convenient.

[0013] In some technical solutions of this utility model, the receiving shaft is provided with an embedding groove, and a plurality of first magnetic blocks are arranged at intervals in the embedding groove. The counterweight includes a second counterweight rod and a plurality of second magnetic blocks, which are disposed on the second counterweight rod near the receiving shaft and correspond one-to-one with the plurality of first magnetic blocks.

[0014] This design further simplifies the connection between the counterweight and the receiving shaft. In certain environments, the connection between the counterweight and the receiving shaft can be completed simply by gravity and magnetic attraction, and personnel only need to make directional adjustments.

[0015] In some technical solutions of this utility model, the first magnetic block is an electromagnet, the receiving shaft is provided with a placement cavity, the placement cavity is provided with a battery, the battery is electrically connected to an electronic control switch, multiple electromagnets are electrically connected to the electronic control switch, and the electronic control switch provided in the placement cavity is electrically connected to the central processing unit.

[0016] This design can further increase the magnetic attraction between the first and second magnetic blocks without worrying about the magnetic attraction being too strong and affecting the disassembly of the counterweight and the receiving shaft later. It can also reduce the manpower involved in the installation and disassembly process.

[0017] In some technical solutions of this utility model, the flexible marking component is provided with a positioning color block near the counterweight component, and the receiving device is provided with a color mark sensor for detecting the positioning color block, which is electrically connected to the central processing unit.

[0018] This design allows for more precise and faster installation between the counterweight and the receiving shaft, further reducing manual operation; personnel only need to observe and supervise.

[0019] In some technical solutions of this utility model, the flexible sign is provided with multiple transparent protective films for covering individual warning sign units.

[0020] Transparent protective film can protect the warning sign components of flexible signs to a certain extent, reducing the rate of wear and tear.

[0021] As a preferred embodiment, the transparent protective film is a square film with an injection port on the upper side.

[0022] In the above embodiments, the dispensing port allows personnel to affix adhesive warning signs to the warning sign unit area, giving the flexible sign a wider marking effect.

[0023] Compared with the prior art, the embodiments of this utility model have at least the following advantages or beneficial effects: In this coal mine warning device, the take-up and receive devices are set along the direction of gravity by a support column. The take-up and receive shafts are rotated. Based on this, the detachable connection between the counterweight and the receive shaft allows for the replacement of various warning sign units on the flexible sign. This enables the warning device to quickly switch between warning signs to adapt to different equipment states, reducing the need for replacement in case of emergencies. At the same time, this warning device has larger warning signs but occupies relatively less storage space, ensuring the warning effect while reducing the obstruction of personnel passage by the warning signs. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of a warning device for coal mines in one embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a flexible marker in a warning device for coal mines, according to another embodiment of the present invention. Figure 3 This is a schematic diagram of the structure of a receiving shaft in a warning device for coal mines, as described in another embodiment of this utility model. Figure 4 This is a partial structural schematic diagram of a warning device for coal mines in another embodiment of the present utility model; Figure 5 This is a second schematic diagram of a partial structure of a warning device for coal mines in another embodiment of this utility model.

[0026] Icons: 1-Support column, 2-Retracting device, 3-Receiving device, 4-Retracting shaft, 5-Flexible marker, 6-Counterweight, 7-Warning marker unit, 8-Receiving shaft, 9-Control cavity, 10-Central processor, 11-Limiting channel, 12-Placement slot, 13-Snap-fit ​​block, 14-First counterweight rod, 15-Snap-fit ​​slot, 16-Embedding slot, 17-First magnetic block, 18-Second counterweight rod, 19-Second magnetic block, 20-Placement cavity, 21-Battery, 22-Positioning color block, 23-Color mark sensor, 24-Transparent protective film, 25-Dispensing port, 26-First drive motor, 27-Second drive motor, 28-Sliding groove, 29-Mounting groove, 30-L-shaped positioning block, 31-Retracting housing, 32-Receiving housing, 33-First insertion port, 34-Second insertion port, 35-Electrical control switch. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0031] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the various embodiments and features described below can be combined with each other.

[0032] Example

[0033] Please refer to Figures 1-5 A warning device for coal mines includes a support column 1, a retractable device 2 on the upper side of the support column 1, a retractable shaft 4 rotatably mounted inside the retractable device 2, a flexible marker 5 connected to the retractable shaft 4, a counterweight 6 at the free end of the flexible marker 5, and multiple warning marker units 7 spaced apart on the flexible marker 5. A receiving device 3 is provided on the lower side of the support column 1 opposite to the retractable device 2, and a receiving shaft 8 rotatably mounted inside the receiving device 3. The counterweight 6 is detachably connected to the receiving shaft 8.

[0034] The principle of this warning device is as follows: the flexible sign 5 is a waterproof cloth, and the warning sign unit 7 can be a sign cloth with fluorescent safety signs printed on it in advance (preferably made of fluorescent waterproof cloth). The warning sign unit 7 can be sewn onto the flexible sign 5; existing adhesive signs can also be pasted onto the flexible sign 5 at intervals; the longitudinal length of the warning sign unit 7 is less than or equal to the distance between the retracting device 2 and the receiving device 3, that is, it ensures that when the counterweight 6 is connected to the receiving shaft 8, the warning sign unit 7 is fully unfolded to meet its warning function.

[0035] The retracting device 2 includes a retracting housing 31, with a first insertion port 33 on its lower side. A first drive motor 26 is housed within the retracting housing 31 and is rotatably connected to the retracting shaft 4. The receiving device 3 includes a receiving housing 32, with a second insertion port 34 on its upper side. A second drive motor 27 is housed within the receiving housing 32 and is rotatably connected to the receiving shaft 8. Figure 4-5 The receiving shaft 8 has an installation groove 29. The longer sidewalls of the installation groove 29 have sliding grooves 28. Multiple L-shaped positioning blocks 30 are slidably mounted on both sliding grooves 28. The L-shaped positioning blocks 30 on the two sliding grooves 28 confine the counterweight 6 within the installation groove 29. A gap is left between the opposite faces of the L-shaped positioning blocks 30 in the two sliding grooves 28. The gap value is greater than or equal to the thickness value of the flexible marking element 5. The receiving device 3 is pre-embedded in the ground. The upper surface of the receiving device 3 is flush with the ground (that is, the receiving housing 32 is pre-embedded underground. The upper surface of the receiving housing 32 is flush with the ground. Preferably, the receiving housing 32 is covered with a cover at the second insertion port 34. When the warning device needs to be used, the cover needs to be opened by personnel). The retraction device 2, the support column 1, and the receiving device 3 are all connected by welding.

[0036] When it is necessary to transmit safety signs such as equipment operating status, maintenance requirements, and hazard information, firstly (if the receiving housing 32 is covered with a cover, it needs to be opened) the first drive motor 26 starts, driving the take-up shaft 4 to rotate. The flexible sign 5 wound on the take-up shaft 4 begins to fall. The counterweight 6, under the influence of gravity, pulls the flexible sign 5 to fall. The counterweight 6 first passes through the first insertion port 33, and then reaches the second insertion port 34. Personnel push multiple L-shaped positioning blocks 30 to both ends of the mounting groove 29 to avoid the counterweight 6. Then, under the action of gravity and human force, the counterweight blocks enter the mounting groove 29 through the sliding groove 28. The first drive motor 26 stops working. Personnel slide the L-shaped positioning blocks 30 and place them above the counterweight 6. The installation of the flexible sign 5 is completed. When the warning sign unit 7 exposed is not the required one, the first drive motor 26 and the second drive motor 27 start synchronously, rotating in the same direction and at the same speed. The warning sign unit 7 begins to change. Once the required warning sign unit 7 is fully exposed, the first drive motor 26 and the second drive motor 27 stop working, and the warning device begins to function. If the warning sign needs to be replaced, the first drive motor 26 and the second drive motor 27 are rotated according to the position of the corresponding warning sign unit 7 to locate the appropriate warning sign unit 7. When the warning device is no longer needed, the first drive motor 26 and the second drive motor 27 rotate synchronously and at the same speed in opposite directions. When the first warning sign unit 7 is fully exposed, the first drive motor 26 and the second drive motor 27 stop rotating synchronously. At this time, the sliding groove 28 of the receiving shaft 8 is exposed. The personnel push the slider open, the load-bearing component is exposed, the first drive motor 26 starts, and the counterweight 6 moves upward. When the counterweight 6 moves upward and enters the storage housing 31, the second drive device stops working, and the flexible sign 5 is stored and waits for the next operation (if there is a cover on the receiving housing 32, it must be covered).

[0037] In this design, the receiving device 3 is pre-embedded underground, largely eliminating the possibility of tripping over it. Only the supporting column 1 is exposed on the ground. Compared to other warning devices in existing technologies, this design saves more space. When equipment malfunctions, personnel do not need to search for warning signs, preventing dangerous situations. Furthermore, when personnel are not present, they can easily and quickly change and adjust different safety signs as needed, enabling rapid transmission of equipment operating status, maintenance requirements, and hazard information. This efficiently provides on-site personnel with the latest safety information and improves safety awareness. To increase visibility, the supporting column 1 can be as high as possible. This increases visibility and allows the deployment and retraction device 2 to be placed higher, reducing its impact on pedestrians or vehicles. It is worth noting that the height of the supporting column 1, i.e., the distance between the deployment and retraction device 2 and the receiving device 3, is also the longitudinal length of the warning sign unit 7. Increasing the height of the supporting column 1 increases the longitudinal length of the warning sign unit 7, ensuring that when the counterweight 6 is connected to the receiving shaft 8, the warning sign unit 7 is fully deployed, fulfilling its warning function.

[0038] In a preferred embodiment, the support column 1 is provided with a control cavity 9, and a central processing unit 10 is provided in the control cavity 9. The retracting device 2 and the receiving device 3 are both electrically connected to the central processing unit 10.

[0039] In the above embodiment, the support column 1 has a control door communicating with the control cavity 9. One side of the control door is hinged to the support column 1, and the other side is installed using a mounting lock. The central processing unit 10 (CPU) is the core component of the computer system, responsible for executing program instructions, processing data, and coordinating the work of various parts of the computer. The first drive motor 26 of the receiving device 2 is electrically connected to the central processing unit 10, and the second drive motor 27 of the receiving device 3 is also connected to the central processing unit. The first drive motor 26 and the second drive motor 27 are preferably servo motors. In this design, the central processing unit 10 controls the operation of the first drive motor 26 and the second drive motor 27, and the control of the speed and start-up is more accurate.

[0040] In a preferred embodiment, the above-mentioned retractable device 2, the above-mentioned support column 1 and the above-mentioned receiving device 3 are connected in sequence in a C-shape, and the support column 1 is provided with a limiting channel 11 for the flexible marker 5 to pass through.

[0041] In the above embodiments, such as Figure 1As shown, the retraction device 2, the support column 1 and the receiving device 3 are sequentially arranged along the direction of gravity, so that the warning device is in a "匚"-shape when it is not in operation; this design greatly utilizes the lengths of the retraction device 2 and the receiving device 3 for the flexible identification member 5 to display warnings. Meanwhile, a limiting channel 11 is opened in the support column 1, so that a part of the flexible identification member 5 is located inside the support column 1 when it is in working state, which provides a certain limiting effect on the side of the warning flexible identification member 5, can resist wind to a certain extent, and is more stable; it should be noted that the warning identification unit 7 needs to be completely exposed outside the support column 1, that is, when in use or during installation, the area of the flexible identification member 5 inside the limiting channel 11 needs to be left vacant to prevent the content in the warning identification unit 7 from being blocked by the support column 1.

[0042] As Figures 2-3 shown, as a preferred embodiment, the receiving shaft 8 is provided with a placement groove 12, a plurality of clamping blocks 13 are arranged at intervals in the placement groove 12, and the counterweight 6 includes a first counterweight rod 14, and the first counterweight rod 14 is provided with clamping grooves 15 that are in clamping engagement with the corresponding clamping blocks 13.

[0043] In the above embodiment, when the first counterweight rod 14 enters the receiving device 3, that is, when the counterweight 6 needs to be connected to the receiving shaft 8, an operator manually presses the first counterweight rod 14, so that the plurality of clamping grooves 15 are respectively clamped with the corresponding clamping blocks 13, and the connection between the counterweight 6 and the receiving shaft 8 is completed; when the counterweight 6 and the receiving shaft 8 need to be disassembled, the operator holds the first counterweight rod 14 and pulls it out upward to complete the disassembly between the plurality of clamping blocks and the corresponding clamping grooves 15; this design makes the assembly and disassembly of the counterweight 6 and the receiving shaft 8 more convenient.

[0044] As Figure 1 shown, as a preferred embodiment, the receiving shaft 8 is provided with an embedding groove 16, a plurality of first magnetic attraction blocks 17 are arranged at intervals in the embedding groove 16, and the counterweight 6 includes a second counterweight rod 18 and a plurality of second magnetic attraction blocks 19 arranged on a side of the second counterweight rod 18 close to the receiving shaft 8 and corresponding to the plurality of first magnetic attraction blocks 17 one by one.

[0045] In the above embodiment, when the first counterweight rod 14 enters the receiving housing 32 of the receiving device 3, the plurality of mutually attracting first magnetic attraction blocks 17 and second magnetic attraction blocks 19 complete the fixation of the second counterweight rod 18; when an operator needs to disassemble the second counterweight rod 18, the operator manually takes out the second counterweight rod 18, and the separation of the first magnetic attraction blocks 17 and the second magnetic attraction blocks 19 completes the disassembly; this design further simplifies the connection between the counterweight 6 and the receiving shaft 8, and in certain environments, the connection between the counterweight 6 and the receiving shaft 8 can be completed only by gravity and magnetic attraction, and the operator only needs to adjust the orientation.

[0046] In a preferred embodiment, the first magnetic block 17 is an electromagnet, the receiving shaft 8 is provided with a placement cavity 20, the placement cavity 20 is provided with a battery 21, the battery 21 is electrically connected to an electronic control switch 35, multiple electromagnets are electrically connected to the electronic control switch 35, and the electronic control switch 35 located in the placement cavity 20 is electrically connected to the central processing unit 10.

[0047] In the above embodiment, the receiving shaft 8 has a placement opening on its side that communicates with the placement cavity 20. The receiving shaft 8 is snapped with a placement plate, and personnel can replace the battery 21 by opening and closing the placement plate. Multiple electromagnets are connected in parallel and are connected to the battery 21 through an electric control switch 35 (the electric control switch 35 controls the connection or disconnection of the circuit by receiving electrical signals (such as changes in current and voltage) to realize remote or automatic control of electrical equipment). When it is necessary to connect the counterweight 6 to the receiving shaft 8, that is, when the second counterweight rod 18 enters the receiving housing 32, the central processing unit 10 controls the electric control switch 35, so that the battery 21 supplies power to multiple electromagnets, so that the first magnetic block 17 becomes magnetic. Subsequently, the magnetic attraction of multiple sets of first magnetic blocks 17 and second magnetic blocks 19 will complete the fixation of the second counterweight rod 18. When the flexible marker 5 of the warning device is retracted, when the first drive motor 26 and the second drive motor 27 begin to rotate in opposite directions, the central processing unit 10 activates the electronic control switch 35 to cut off the power supply between the battery 21 and the first magnetic block 17. When the second drive motor 27 stops rotating and the first drive motor 26 continues to rotate, the flexible marker 5, under the rotation of the first drive motor 26, can be easily pulled out of the receiving device 3 because there is no longer any magnetic attraction between the first magnetic block 17 and the second magnetic block 19. This design can further increase the magnetic attraction between the first magnetic block 17 and the second magnetic block 19 without worrying about the magnetic attraction being too strong and affecting the disassembly of the counterweight 6 and the receiving shaft 8. It can also reduce the human involvement in the installation and disassembly process.

[0048] In a preferred embodiment, the flexible marker 5 is provided with a positioning color block 22 near the counterweight 6, and the receiving device 3 is provided with a color mark sensor 23 for detecting the positioning color block 22, which is electrically connected to the central processing unit 10.

[0049] In the above embodiment, the color mark sensor 23 can be set outside the receiving housing 32 or inside the receiving housing 32, preferably outside the receiving housing 32, so that the first magnetic block 17 and the second magnetic block 19 can work earlier, that is, they can cooperate with gravity to guide the flexible marker 5 to a certain extent; the color mark sensor 23 can detect the positioning color block 22 on the flexible marker 5, identify the position of the flexible part, that is, identify the specific position of the counterweight 6, and send the position signal to the central processing unit 10, so that the central processing unit can supply power to the electromagnet in a timely and accurate manner; this design makes the installation between the counterweight 6 and the receiving shaft 8 more precise and faster, further reducing manual operation. Personnel only need to observe and supervise, and play an auxiliary role in solving problems, reducing the workload of personnel.

[0050] As a preferred embodiment, the flexible sign 5 is provided with a plurality of transparent protective films 24, each for covering a single warning sign unit 7.

[0051] In the above embodiments, the transparent protective film 24 can be made of PVC transparent film (PVC transparent film is a transparent film material made of polyvinyl chloride (PVC) as the main raw material, which has the characteristics of high transparency, good flexibility and excellent processing performance); the transparent protective film 24 and the flexible sign 5 (the flexible sign 5 can be made of fluorescent waterproof cloth) can be connected by heat sealing, high frequency welding, glue or tape, etc.; the transparent protective film 24 can protect the warning sign unit 7 of the flexible sign to a certain extent and reduce its wear rate.

[0052] As a preferred embodiment, the transparent protective film 24 is a square film with an injection port 25 on the upper side.

[0053] In the above embodiment, the dispensing port 25 allows personnel to affix adhesive warning signs to the warning sign unit 7, thus giving the flexible sign 5 a wider marking effect.

[0054] In summary, the embodiments of this utility model provide a warning device for coal mines. This warning device has more types of warning signs, and personnel can adjust the warning signs according to the actual condition of the equipment on site, which is more convenient. At the same time, the warning device can be stored away when not in use. Compared with existing warning signs, it has a larger warning area and occupies less space when stored, minimizing the obstruction of personnel passage by the warning signs. This allows the warning device to be located near the equipment for a long time, reducing the time that personnel spend searching for the corresponding warning signs when a warning is needed, reducing the situation where warning signs are not in place when danger occurs, and providing greater safety assurance.

Claims

1. A warning device for coal mines, comprising a support column (1), a retractable device (2) on the upper side of the support column (1), a retractable shaft (4) rotatably mounted inside the retractable device (2), a flexible marker (5) connected to the retractable shaft (4), and a counterweight (6) at the free end of the flexible marker (5), characterized in that, The flexible sign (5) is provided with multiple warning sign units (7) arranged at intervals. The support column (1) is provided with a receiving device (3) on the lower side opposite to the retracting device (2). The receiving device (3) is provided with a receiving shaft (8) that rotates inside. The counterweight (6) is detachably connected to the receiving shaft (8). The receiving device (3) is embedded in the ground and the upper surface of the receiving device (3) is flush with the ground. The retracting device (2), the support column (1) and the receiving device (3) are connected in sequence in a U-shape. The support column (1) is provided with a limiting channel (11) for the flexible sign (5) to pass through.

2. A warning device for use in a coal mine as claimed in claim 1 wherein, The supporting column (1) is provided with a control cavity (9), and a central processing unit (10) is provided in the control cavity (9). The retracting device (2) and the receiving device (3) are both electrically connected to the central processing unit (10).

3. A warning device for use in a coal mine as claimed in claim 1 or 2, characterised in that, The receiving shaft (8) has a placement groove (12), and multiple snap-fit ​​blocks (13) are spaced apart in the placement groove (12). The counterweight (6) includes a first counterweight rod (14), and the first counterweight rod (14) has a snap-fit ​​groove (15) that engages with the snap-fit ​​block (13).

4. A warning device for use in a coal mine as defined in claim 2, wherein The receiving shaft (8) has an embedding groove (16), and multiple first magnetic blocks (17) are spaced apart in the embedding groove (16). The counterweight (6) includes a second counterweight rod (18) and multiple second magnetic blocks (19) on the second counterweight rod (18) near the receiving shaft (8) that correspond one-to-one with the multiple first magnetic blocks (17).

5. A warning device for use in a coal mine as claimed in claim 4 wherein, The first magnetic block (17) is an electromagnet. The receiving shaft (8) has a placement cavity (20). The placement cavity (20) has a battery (21). The battery (21) is electrically connected to an electric control switch (35). Multiple electromagnets are electrically connected to the electric control switch (35). The electric control switch (35) located in the placement cavity (20) is electrically connected to the central processing unit (10).

6. A warning device for use in a coal mine as claimed in claim 5 wherein, The flexible marker (5) has a positioning color block (22) near the counterweight (6), and the receiving device (3) has a color mark sensor (23) electrically connected to the central processor (10) for detecting the positioning color block (22).

7. The warning device for coal mine according to claim 1 or 2, characterized in that, The flexible sign (5) is provided with multiple transparent protective films (24) for covering individual warning sign units (7).

8. A warning device for use in a coal mine as claimed in claim 7, characterised in that, The transparent protective film (24) is a square film with an injection port (25) on the upper side.

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