Roadway support device pressure alarm structure

Abstract

The utility model relates to pressure alarm structure technical field, and disclose roadway support device pressure alarm structure, including base, still including having set up installation component on base. Through the extension length control of telescopic inner rod relative to fixed frame the inclination angle of support plate, and then conveniently support different roadway, through the damping telescopic link and compression spring buffer support plate, and then absorb a part of the impact degree, make collapse is small, support plate can support, when the damping telescopic link and compression spring absorb the collapse that cannot be borne, through the sliding block and slide up and the pressure sensor of both sides and touch, pressure sensor sends instruction to PLC controller, and PLC controller receives instruction synchronous starting buzzer and alarm lamp, and then the staff in the roadway inside carries out alarm, makes the staff in the roadway have time to escape, and then will operating personnel detect the danger of collapse in advance, reduce the occurrence of safety accidents.

Description

Technical Field

[0001] This utility model relates to the field of pressure alarm structure technology, and in particular to a pressure alarm structure for roadway support devices. Background Technology

[0002] Roadways are artificially excavated or constructed passages in underground engineering to meet the needs of mining, transportation, ventilation, and drainage. They are widely found in coal mines, metal mines, tunnel engineering, underground transportation, and water conservancy. They are the "blood vessels" and "skeleton" of underground space development and are directly related to the safety, efficiency, and economy of the project. Roadway support devices are key structural systems used in underground operations such as coal mines, metal mines, and tunnel engineering to maintain the stability of the surrounding rock of roadways (or tunnels) and prevent collapse.

[0003] In existing technologies, most roadway support devices do not have a pressure alarm structure, which means they cannot provide workers with valuable evacuation time when the surrounding rock pressure rises abnormally or when there are signs of roadway collapse. This leaves the support system in a "passive load" state for a long time, and because workers cannot detect potential dangers in advance, their lives are directly exposed to a huge threat, which may lead to serious safety accidents at any time. Therefore, it is necessary to improve the pressure alarm structure of roadway support devices to solve the above problems. Utility Model Content

[0004] To overcome the problem that most existing roadway support devices do not have a pressure alarm structure, which makes it impossible for them to buy precious evacuation time for workers when the surrounding rock pressure rises abnormally or when there are signs of roadway collapse.

[0005] The technical solution of this utility model is as follows: a pressure alarm structure for a roadway support device, including a base, and further including an installation component mounted on the base, a semi-circular block fixedly connected to the top of the base, a support plate rotatably connected to the semi-circular block, a PLC controller fixedly connected to one side of the support plate, a buzzer fixedly connected to the support plate near the PLC controller, an alarm light fixedly connected to the support plate near the PLC controller, a fixed frame fixedly connected to the support plate near the PLC controller, a sliding block slidably connected inside the fixed frame, a damping telescopic rod fixedly connected between the fixed frame and the sliding block, and a fixed... A compression spring is connected between the fixed frame and the sliding block; a pressure sensor is fixedly connected to the fixed frame; a movable bracket is rotatably connected to the sliding block; a fixed frame is fixedly connected to the top of the base; a telescopic inner rod is slidably connected inside the fixed frame; a fixed block is fixedly connected to the end of the telescopic inner rod away from the fixed frame; a buzzer is electrically connected to the PLC controller; an alarm light is electrically connected to the PLC controller; a pressure sensor is electrically connected to the PLC controller; the sliding block slides inside the fixed frame to contact the pressure sensor; and the end of the movable bracket away from the sliding block is rotatably connected to the fixed block.

[0006] Preferably, the fixed frame has a matching through groove at the corresponding position of the sliding block, and the sliding block slides inside the through groove of the fixed frame.

[0007] Preferably, the fixing frame has a groove at the corresponding position of the telescopic inner rod, and the telescopic inner rod slides in the groove of the fixing frame.

[0008] Preferably, a limiting block is fixedly connected inside the fixed frame, and the limiting block is located inside the telescopic inner rod. A protective frame is fixedly connected to the fixed frame, and a rotating handwheel is rotatably connected inside the protective frame. A first bevel gear is fixedly connected to the rotating handwheel, and a second bevel gear meshes with the outside of the first bevel gear. A worm gear is fixedly connected inside the second bevel gear, and the worm gear is rotatably connected inside the protective frame. A worm wheel meshes with the outside of the worm gear, and a long rod is fixedly connected inside the worm wheel. The long rod is rotatably connected inside the fixed frame, and a circular gear is fixedly connected to the long rod, which is located inside the fixed frame. A toothed plate is fixedly connected to one side of the telescopic inner rod, and the circular gear meshes with the outside of the toothed plate. The telescopic inner rod is moved by the circular gear meshing with the outside of the toothed plate.

[0009] Preferably, the telescopic inner rod has a matching groove at the corresponding position of the limiting block, and the limiting block is set inside the groove of the telescopic inner rod.

[0010] Preferably, the fixing frame has a matching through groove at the corresponding position of the circular gear, and the circular gear is set inside the through groove of the fixing frame.

[0011] Preferably, the mounting assembly includes a rotating rod rotatably connected inside the base, a fixed plate fixedly connected to the rotating rod, a conical auger fixedly connected to the rotating rod, an insert cone fixedly connected to the bottom of the rotating rod, and a rotating plate fixedly connected to the top of the rotating rod, with the fixed plate rotatably connected inside the base.

[0012] Preferably, the base has a matching circular groove at the corresponding position of the fixing plate, and the fixing plate rotates within the circular groove of the base.

[0013] The beneficial effects of this utility model are:

[0014] 1. The tilt angle of the support plate is controlled by the extension length of the telescopic inner rod relative to the fixed frame, which facilitates the support of different roadways. The support plate is buffered by the damping telescopic rod and compression spring, which absorbs part of the impact force. When the collapse is small, the support plate can provide support. When the collapse cannot be absorbed by the damping telescopic rod and compression spring, the sliding block slides upward and contacts the pressure sensors on both sides. The pressure sensors send a command to the PLC controller. Upon receiving the command, the PLC controller simultaneously activates the buzzer and alarm light, which alarms the workers in the roadway, giving them time to escape. This allows workers to be aware of the danger of collapse in advance and reduces the occurrence of safety accidents.

[0015] 2. The workers place the base on the support of the tunnel, and then rotate the rotating disc to drive the rotating rod to rotate. With the cooperation of the cone and the cone auger, the rotating rod is inserted into the soil, and the base is installed, providing stability for the base. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of one embodiment of the pressure alarm structure of the roadway support device of this utility model;

[0017] Figure 2 This is a schematic diagram of the support plate structure of this utility model;

[0018] Figure 3 This is a cross-sectional view of the fixed frame structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the limiting block structure of this utility model;

[0020] Figure 5 This is a cross-sectional view of the protective frame of this utility model;

[0021] Figure 6 This is a schematic diagram of the installation component structure of this utility model.

[0022] Explanation of reference numerals in the attached drawings: 1. Base; 21. Semicircular block; 22. Support plate; 23. PLC controller; 24. Buzzer; 25. Alarm light; 26. Telescopic inner rod; 27. Fixing block; 28. Fixing frame; 29. ​​Sliding block; 210. Damping telescopic rod; 211. Compression spring; 212. Movable bracket; 213. Pressure sensor; 214. Limiting block; 215. Toothed plate; 216. Protective frame; 217. Rotating handwheel; 218. First bevel gear; 219. Second bevel gear; 220. Worm gear; 221. Worm wheel; 222. Long rod; 223. Circular gear; 224. Fixing frame; 31. Rotating rod; 32. Fixing disc; 33. Conical auger; 34. Insert cone; 35. Rotating disc. Detailed Implementation

[0023] Implementable methods already discovered in this field:

[0024] In the field of underground engineering, tunnels, as artificially excavated or constructed passages to meet diverse needs such as mining, transportation, ventilation, and drainage, are of paramount importance. Widely distributed across numerous industries including coal mines, metal mines, tunnel engineering, underground transportation, and water conservancy, they act as the "blood vessels" and "skeleton" of underground space development, providing fundamental support for the normal operation of the entire underground engineering system. The safety and stability of tunnels directly affect the safety, efficiency, and economy of the project. Problems with tunnels can not only lead to production interruptions but also trigger serious safety accidents, causing significant casualties and property losses. Tunnel support devices, as a key structural system for maintaining the stability of the surrounding rock and preventing collapse, directly impact the safety of the tunnel.

[0025] Roadways play multiple crucial functions in underground engineering. In coal mining, roadways serve as channels for transporting coal, using conveyor belts or mine cars to move mined coal from the working face to the surface. They also act as access routes for personnel and equipment, providing necessary space for miners' operations and the installation and maintenance of equipment. Ventilation roadways are responsible for supplying fresh air to the working face and expelling stale air, creating a good working environment for miners and preventing safety hazards such as gas accumulation and excessive dust. Drainage roadways are used to remove accumulated water in underground engineering projects, preventing flooding from affecting project safety and the normal operation of equipment. Furthermore, in some underground transportation and water conservancy projects, roadways also serve important functions such as vehicle passage and water transport.

[0026] In the coal mining sector, coal mine roadways are intricately interconnected, including main shafts, auxiliary shafts, haulage roadways, return air roadways, and mining area roadways. These roadways form a complete coal mining and transportation system. The main shaft is primarily used for hoisting coal, while the auxiliary shaft is used for transporting personnel, materials, and equipment. The haulage roadways collect coal from various mining areas and transport it to the main shaft, while the return air roadways are responsible for expelling polluted air from the working face. Mining area roadways directly serve the coal mining operations and include haulage roadways, return air roadways, and cutting holes.

[0027] In the metal mining sector: Metal mine roadways are primarily used for ore extraction, transportation, and ventilation. Compared to coal mine roadways, metal mine roadways face more complex geological conditions, with varying types and properties of ore, thus requiring more stringent design and construction standards. For instance, in some non-ferrous metal mines, the presence of high levels of sulfides in the ore can easily generate acidic water, causing corrosion to the roadway's support structure, necessitating special anti-corrosion measures.

[0028] In the field of tunnel engineering, tunnels are primarily used for transportation and water conservancy. Transportation tunnels, including railway and highway tunnels, provide convenient passageways for people's travel. Water conservancy tunnels are used for water diversion and drainage, such as some water conveyance tunnels in the South-to-North Water Diversion Project. Tunnels in tunnel engineering are typically characterized by their long length and large span, placing extremely high demands on their stability and safety.

[0029] In the field of underground transportation: With the acceleration of urbanization, underground transportation is developing rapidly, with subways, underground parking lots, and other underground transportation facilities constantly increasing. These underground transportation tunnels must not only meet the needs of transportation functions but also consider factors such as personnel evacuation and fire safety. For example, the tunnel design of subway stations requires the rational planning of spaces such as station halls, platforms, and passageways to ensure that people can evacuate quickly in emergencies.

[0030] In the field of water conservancy: In water conservancy projects, tunnels are mainly used for the construction, maintenance, and flow control of hydraulic structures. For example, underground powerhouses and water diversion tunnels in hydropower stations are important water conservancy tunnels. The construction of these tunnels is challenging, requiring solutions to technical problems under complex geological conditions such as high ground stress and high water pressure.

[0031] The safety and stability of tunnels are prerequisites for the smooth progress of underground engineering projects. Collapses or deformations in tunnels directly threaten personnel safety, leading to equipment damage and production interruptions. For example, in coal mines, tunnel collapses can block ventilation routes, causing gas accumulation and potentially triggering gas explosions; in tunnel engineering, tunnel deformation can affect tunnel capacity and increase maintenance costs. Furthermore, the design and construction quality of tunnels also affect the efficiency and economy of the project. A well-planned tunnel layout can reduce transportation distances, improve transportation efficiency, and lower production costs; while a good tunnel support structure can extend the tunnel's service life, reduce maintenance frequency, and save on maintenance costs.

[0032] The main function of roadway support devices is to maintain roadway stability by providing a certain level of support resistance, limiting the deformation and fracture development of the surrounding rock. Common roadway support methods include bolt support, cable support, metal support, and concrete support. Bolt support involves anchoring bolts into the surrounding rock, utilizing the anchoring force of the bolts and the bearing capacity of the surrounding rock itself to form a shared load-bearing structural system, thereby improving the stability of the surrounding rock. Cable support, based on bolt support, uses high-strength steel strands as anchor cables to connect unstable rock strata with deeper stable rock strata, enhancing the support effect. Metal support utilizes the strength and rigidity of metal materials to withstand the pressure of the surrounding rock and prevent roadway collapse. Concrete support involves pouring concrete to form a monolithic support structure, improving the roadway's load-bearing capacity.

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0034] Please see Figure 1 - Figure 6This utility model provides an embodiment of a roadway support device pressure alarm structure, including a base 1, and further including an installation assembly mounted on the base 1, a semi-circular block 21 fixedly connected to the top of the base 1, a support plate 22 rotatably connected to the semi-circular block 21, a PLC controller 23 fixedly connected to one side of the support plate 22, a buzzer 24 fixedly connected to the side of the support plate 22 near the PLC controller 23, an alarm light 25 fixedly connected to the side of the support plate 22 near the PLC controller 23, a fixing frame 28 fixedly connected to the side of the support plate 22 near the PLC controller 23, and a sliding block slidably connected inside the fixing frame 28. 29. A damping telescopic rod 210 fixedly connected between the fixed frame 28 and the sliding block 29; a compression spring 211 fixedly connected between the fixed frame 28 and the sliding block 29; a pressure sensor 213 fixedly connected to the fixed frame 28; a movable bracket 212 rotatably connected to the sliding block 29; a fixed frame 224 fixedly connected to the top of the base 1; a telescopic inner rod 26 slidably connected inside the fixed frame 224; a fixed block 27 fixedly connected to the end of the telescopic inner rod 26 away from the fixed frame 224; a buzzer 24 electrically connected to the PLC controller 23; an alarm light 25 electrically connected to the PLC controller 23; and a pressure sensor. Device 213 is electrically connected to PLC controller 23. It slides inside fixed frame 28 via sliding block 29 to contact pressure sensor 213. The end of movable bracket 212 away from sliding block 29 is rotatably connected to fixed block 27. The extension length of telescopic inner rod 26 relative to fixed frame 224 controls the tilt angle of support plate 22, facilitating support for different roadways. Damping telescopic rod 210 and compression spring 211 buffer the support plate 22, absorbing some of the impact force. This allows the support plate 22 to provide support when the collapse is small. In the event of a collapse, the damping telescopic rod 210 and compression spring 211... When the collapse is too large to be absorbed by the sliding block 29, it slides upward and comes into contact with the pressure sensors 213 on both sides. The pressure sensors 213 send a command to the PLC controller 23. Upon receiving the command, the PLC controller 23 synchronously activates the buzzer 24 and the alarm light 25, thereby alarming the workers inside the tunnel and giving them time to escape. The installation component is installed by the workers placing the base 1 at the support of the tunnel, and then rotating the rotating disk 35 to drive the rotating rod 31 to rotate. By inserting the rotating rod 31 into the soil, the base 1 is installed, providing stability for the base 1.

[0035] Please see Figure 1 - Figure 5In this embodiment, the fixed frame 28 has a corresponding through groove at the position of the sliding block 29. The sliding block 29 slides inside the through groove of the fixed frame 28, thereby limiting the sliding block 29 and improving the support stability of the support plate 22. When the sliding block 29 moves to the point of contact with the pressure sensor 213, an alarm is triggered, thereby improving practicality. The fixed frame 224 has a groove at the corresponding position of the telescopic inner rod 26. The telescopic inner rod 26 slides inside the groove of the fixed frame 224, thereby controlling the tilt angle of the support plate 22 by the extension length of the telescopic inner rod 26 relative to the fixed frame 224, thereby facilitating support for different roadways and improving the adaptability of the support. The fixed frame 224 is internally fixedly connected to a limit block 214. 4. Inside the telescopic inner rod 26, a protective frame 216 is fixedly connected to the fixing frame 224. A rotating handwheel 217 is rotatably connected inside the protective frame 216. A first bevel gear 218 is fixedly connected to the rotating handwheel 217. A second bevel gear 219 meshes with the first bevel gear 218. A worm gear 220 is fixedly connected inside the second bevel gear 219. The worm gear 220 is rotatably connected inside the protective frame 216. A worm wheel 221 meshes with the worm gear 220. A long rod 222 is fixedly connected inside the worm wheel 221. The long rod 222 is rotatably connected inside the fixing frame 224. A circular gear 223 is fixedly connected to the long rod 222. The circular gear 223 is located inside the fixing frame 224. The telescopic inner rod 26... A toothed plate 215 is fixedly connected to the side, and a circular gear 223 meshes with the outside of the toothed plate 215. The circular gear 223 meshes with the outside of the toothed plate 215, driving the telescopic inner rod 26 to move. The extension length of the telescopic inner rod 26 relative to the fixed frame 224 controls the tilt angle of the support plate 22, thus facilitating support for different roadways. The damping telescopic rod 210 and compression spring 211 buffer the support plate 22, absorbing some of the impact force. This allows the support plate 22 to provide support when the collapse is minor. In the event of a collapse that the damping telescopic rod 210 and compression spring 211 cannot absorb, the sliding block 29 slides upwards and contacts the pressure sensors 213 on both sides. The pressure sensors 213 send commands to the PLC control unit. When the PLC controller 23 receives the instruction, it synchronously activates the buzzer 24 and the alarm light 25 to alert the workers inside the tunnel, giving them time to escape. The telescopic inner rod 26 has a matching groove at the corresponding position of the limit block 214. The limit block 214 is located inside the groove of the telescopic inner rod 26, thereby limiting the extension distance of the telescopic inner rod 26 and improving the adaptability of the support plate 22 to different tunnels. The fixed frame 224 has a matching through groove at the corresponding position of the circular gear 223. The circular gear 223 is located inside the through groove of the fixed frame 224. When the circular gear 223 rotates, the fixed frame 224 does not affect it, thus improving the rotational stability of the circular gear 223.

[0036] Please see Figure 1 , Figure 6 In this embodiment, the installation assembly includes a rotating rod 31 rotatably connected inside the base 1, a fixed plate 32 fixedly connected to the rotating rod 31, a conical auger 33 fixedly connected to the rotating rod 31, an insert cone 34 fixedly connected to the bottom of the rotating rod 31, and a rotating plate 35 fixedly connected to the top of the rotating rod 31. The fixed plate 32 is rotatably connected inside the base 1. The worker places the base 1 at the support of the tunnel, and then rotates the rotating plate 35 to drive the rotating rod 31 to rotate. The insert cone 34 and the conical auger 33 cooperate to insert the rotating rod 31 into the soil, thereby installing the base 1 and providing stability for the base 1. The base 1 has a matching circular groove at the corresponding position of the fixed plate 32. The fixed plate 32 rotates in the circular groove of the base 1, thereby limiting the rotation rod 31, thereby improving the stability of the conical auger 33 inside the soil, and improving the installation stability of the base 1.

[0037] In operation, the operator first places two sets of bases 1 symmetrically on both sides of the tunnel. Then, by rotating the rotating disc 35, the rotating rod 31 is driven to rotate. Through the cooperation of the insert cone 34 and the conical auger 33, the rotating rod 31 is inserted into the ground to fix the position of the base 1. Then, the operator rotates the rotating handwheel 217, which drives the first conical gear 218 to rotate. Through the engagement of the second conical gear 219 with the outside of the first conical gear 218, the worm gear 220 is driven to rotate inside the protective frame 216. The worm gear 221 meshes with the outside of the worm 220, thereby driving the long rod 222 to rotate inside the fixed frame 224. The toothed plate 215 meshes with the outside of the circular gear 223, thereby driving the telescopic inner rod 26 to extend and retract inside the fixed frame 224. The movable bracket 212 drives the support plate 22 to rotate on the semi-circular block 21, thereby adjusting the support angle of the support plate 22. This allows the outer wall of the support plate 22 to contact the inner side of the roadway for support, improving the adaptability of the support device. When the roadway outside the support plate 22 collapses... The collapsed surrounding rock exerts pressure on the support plate 22, causing it to rotate inside the semicircular block 21. This causes the sliding block 29 to slide within the through groove of the fixed frame 28. The damping telescopic rod 210 and compression spring 211 buffer the support plate 22, absorbing some of the impact force. This allows the support plate 22 to provide support when the collapse is minor, improving the stability of the support. When the damping telescopic rod 210 and compression spring 211 can no longer absorb the collapse, the sliding block 29 slides upwards within the fixed frame 28. The sliding block 29 then slides upwards within the two... The pressure sensor 213 on the side is activated, and the pressure sensor 213 sends a command to the PLC controller 23. Upon receiving the command, the PLC controller 23 synchronously activates the buzzer 24 and the alarm light 25. The working principle of the PLC controller 23, the buzzer 24, the alarm light 25 and the pressure sensor 213 is a common technical means in this field, so it will not be described in detail. The buzzer 24 emits a warning sound and the alarm light 25 emits a bright flashing light, thereby alarming the staff inside the tunnel and giving them time to escape.

[0038] Through the above steps, the damping telescopic rod 210 and compression spring 211 buffer the support plate 22, thereby absorbing part of the impact force. When the collapse is small, the support plate 22 can provide support. When a collapse occurs that the damping telescopic rod 210 and compression spring 211 cannot absorb, the sliding block 29 slides upward to contact the pressure sensors 213 on both sides. The pressure sensors 213 send a command to the PLC controller 23. Upon receiving the command, the PLC controller 23 synchronously activates the buzzer 24 and the alarm light 25, thereby alarming the workers inside the tunnel and giving them time to escape. This solves the problem that most existing tunnel support devices do not have a pressure alarm structure, which makes it impossible for them to buy valuable evacuation time for workers when the surrounding rock pressure rises abnormally or when there are signs of a tunnel collapse.

Claims

1. A pressure alarm structure for a roadway support device, comprising a base (1), characterized in that: It also includes a mounting assembly mounted on the base (1), a semicircular block (21) fixedly connected to the top of the base (1), a support plate (22) rotatably connected to the semicircular block (21), a PLC controller (23) fixedly connected to one side of the support plate (22), a buzzer (24) fixedly connected to the side of the support plate (22) near the PLC controller (23), an alarm light (25) fixedly connected to the side of the support plate (22) near the PLC controller (23), a fixed frame (28) fixedly connected to the side of the support plate (22) near the PLC controller (23), a sliding block (29) slidably connected inside the fixed frame (28), a damping telescopic rod (210) fixedly connected between the fixed frame (28) and the sliding block (29), and a compression spring (211) fixedly connected between the fixed frame (28) and the sliding block (29). The following components are connected to the fixed frame (28): a pressure sensor (213), a movable bracket (212) rotatably connected to a sliding block (29), a fixed frame (224) fixedly connected to the top of the base (1), a telescopic inner rod (26) slidably connected inside the fixed frame (224), and a fixed block (27) fixedly connected to the end of the telescopic inner rod (26) away from the fixed frame (224). The buzzer (24) is electrically connected to the PLC controller (23), the alarm light (25) is electrically connected to the PLC controller (23), and the pressure sensor (213) is electrically connected to the PLC controller (23). The movable bracket (212) slides inside the fixed frame (28) through the sliding block (29) to contact the pressure sensor (213). The end of the movable bracket (212) away from the sliding block (29) is rotatably connected to the fixed block (27).

2. The roadway support device pressure alarm structure according to claim 1, characterized in that: The fixed frame (28) has a corresponding through groove at the corresponding position of the sliding block (29), and the sliding block (29) slides inside the through groove of the fixed frame (28).

3. The roadway support device pressure alarm structure according to claim 1, characterized in that: The fixing frame (224) has a groove at the corresponding position of the telescopic inner rod (26), and the telescopic inner rod (26) slides in the groove of the fixing frame (224).

4. The roadway support device pressure alarm structure according to claim 1, characterized in that: A limiting block (214) is fixedly connected inside the fixed frame (224). The limiting block (214) is located inside the telescopic inner rod (26). A protective frame (216) is fixedly connected to the fixed frame (224). A rotating handwheel (217) is rotatably connected inside the protective frame (216). A first bevel gear (218) is fixedly connected to the rotating handwheel (217). A second bevel gear (219) meshes with the outside of the first bevel gear (218). A worm gear (220) is fixedly connected inside the second bevel gear (219). The worm gear (220) is rotatably connected inside the protective frame (216). The worm gear (220) is externally meshed with a worm wheel (221), and a long rod (222) is fixedly connected inside the worm wheel (221). The long rod (222) is rotatably connected inside the fixed frame (224). A circular gear (223) is fixedly connected to the long rod (222). The circular gear (223) is located inside the fixed frame (224). A toothed plate (215) is fixedly connected to one side of the telescopic inner rod (26). The circular gear (223) meshes with the outside of the toothed plate (215). The telescopic inner rod (26) is moved by the circular gear (223) meshing with the outside of the toothed plate (215).

5. The roadway support device pressure alarm structure according to claim 4, characterized in that: The telescopic inner rod (26) has a matching groove at the corresponding position of the limiting block (214), and the limiting block (214) is set inside the groove of the telescopic inner rod (26).

6. The roadway support device pressure alarm structure according to claim 4, characterized in that: The fixing frame (224) has a corresponding through groove at the corresponding position of the circular gear (223), and the circular gear (223) is located inside the through groove of the fixing frame (224).

7. The roadway support device pressure alarm structure according to claim 1, characterized in that: The mounting components include a rotating rod (31) rotatably connected inside the base (1), a fixed plate (32) fixedly connected to the rotating rod (31), a conical auger (33) fixedly connected to the rotating rod (31), an insert cone (34) fixedly connected to the bottom of the rotating rod (31), and a rotating plate (35) fixedly connected to the top of the rotating rod (31). The fixed plate (32) is rotatably connected inside the base (1).

8. The roadway support device pressure alarm structure according to claim 7, characterized in that: The base (1) has a matching circular groove at the corresponding position of the fixed plate (32), and the fixed plate (32) rotates in the circular groove of the base (1).

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