An early warning device for disaster prevention and mitigation monitoring

Abstract

This invention discloses an early warning device for disaster prevention and mitigation monitoring, relating to the field of meteorological early warning technology. It includes: a support frame for fixing to a slope; a displacement sensor fixedly installed at the bottom of the support frame, comprising a primary detection module and a primary communication module; a measuring cup fixedly installed on the inner wall of the support frame; a water level sensor fixedly penetrating the inner and outer walls of the measuring cup, comprising a secondary detection module and a secondary communication module; a mounting frame fixedly installed inside the measuring cup; and a lifting plate slidably penetrating the bottom of the mounting frame. The lifting plate dynamically adjusts the drainage volume, with the water level rise rate positively correlated with rainfall intensity, effectively shortening the alarm time and preventing delayed alarms during tunnel construction caused by fixed drainage holes.

Description

Technical Field

[0001] This invention relates to the field of meteorological early warning technology, specifically to an early warning device for disaster prevention and mitigation monitoring. Background Technology

[0002] The disaster prevention and mitigation monitoring and early warning device designed for underground tunnel construction aims to monitor natural disasters that may occur during tunnel construction, such as heavy rainfall, water accumulation, or landslides, and provide real-time early warnings so that corresponding emergency measures can be taken to ensure construction safety and project progress.

[0003] Patent publication number CN222088142U relates to an early warning device for disaster prevention and mitigation monitoring. Existing early warning devices are relatively complex and subject to significant terrain limitations. The early warning device includes a mounting column, a support unit, a water cup, and a rainfall sensor. The mounting column is partially buried in a predetermined area. The support unit is located on the unburied portion of the mounting column and has a support cavity. The water cup is located within the support cavity and includes a water inlet, a water outlet, and a water-holding chamber. The rainfall sensor is located on the support unit and includes a sensor body, a probe, and a first communication module. The probe is connected to the sensor body, penetrates the side wall of the water cup, and extends into the water-holding chamber. This patent uses the water cup and rainfall sensor to detect real-time rainfall in a predetermined area to determine the severity of natural disasters and issue early warnings. This solution has a simple structure, is easy to install, and has low cost. It is not subject to terrain limitations and is suitable for areas with high rainfall and frequent natural disasters.

[0004] The aforementioned patent features a simple structure, convenient installation, and low cost. It detects real-time rainfall in a predetermined area using a water cup and a rain sensor to determine the severity of natural disasters and issue early warnings, which helps reduce losses caused by natural disasters. However, during underground tunnel construction, timely monitoring and alarms are required at the tunnel entrance. Since the size of the water cup's leak outlet is fixed, the drainage rate cannot be dynamically adjusted according to the rainfall intensity. The fixed drainage rate prevents the sensor from reflecting the actual rainfall in a timely manner, leading to a lag in early warning information. This delay can cause the best emergency response time to be missed, thus affecting the timely implementation of preventive measures and increasing the safety risks and economic losses caused by rainfall during tunnel construction. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an early warning device for disaster prevention and mitigation monitoring, which solves the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an early warning device for disaster prevention and mitigation monitoring, comprising: a support frame for fixing to a slope; a displacement sensor fixedly installed at the bottom of the support frame, the displacement sensor including a primary detection module and a primary communication module; a measuring cup fixedly installed on the inner wall of the support frame; a water level sensor fixedly penetrating the inner and outer walls of the measuring cup, the water level sensor including a secondary detection module and a secondary communication module; a mounting frame fixedly installed inside the measuring cup; a lifting plate slidably penetrating the bottom of the mounting frame, the lifting plate having several through holes for rainwater to pass through; a primary spring disposed between the lifting plate and the mounting frame; and a circular plate fixedly installed on the inner wall of the measuring cup, the circular plate having circular holes for rainwater to pass through. The lifting plate dynamically adjusts the drainage volume, and the water level rise rate is positively correlated with the rainfall intensity, effectively shortening the alarm time.

[0007] According to the above technical solution, a filter plate is provided on the top of the mounting frame, and two clamping plates are fixedly installed on the surface of the filter plate. The filter plate is in contact with the top of the measuring cup, and a conical surface is provided at the bottom of the filter plate. By setting the filter plate, foreign objects in rainwater are effectively blocked, preventing impurities from entering the interior of the measuring cup and affecting the measurement accuracy.

[0008] According to the above technical solution, a rectangular groove is provided on the side of the mounting frame near the card plate, and the two card plates are in contact with the inner wall of the rectangular groove. By applying effective limiting to the filter plate, it can effectively resist the impact of slope falling rocks and strong winds.

[0009] According to the above technical solution, the mounting frame is internally equipped with a pushing device for quickly disassembling the filter plate and an auxiliary device for controlling the pushing speed. The pushing device includes a fixed tube, a telescopic frame, a second spring, and a contact tube. The fixed tube is fixedly installed inside the mounting frame, the telescopic frame slides through the top of the fixed tube, the second spring is disposed between the telescopic frame and the fixed tube, the contact tube is fixedly installed on the top of the telescopic frame, and the telescopic frame contacts the bottom of the filter plate. By setting the second spring, the operator needs to apply a certain downward pressure when installing the filter plate to prevent improper installation due to careless operation.

[0010] According to the above technical solution, a rubber plate slides through the inner and outer walls of the contact tube, and a reset spring is provided between the rubber plate and the contact tube. The side of the rubber plate away from the reset spring contacts the circumferential surface of the filter plate. A C-shaped buckle is fixedly installed at the bottom of the telescopic frame. The rubber plate applies a stable clamping force to the filter plate, which not only ensures that the filter plate rises smoothly, but also prevents the filter plate from falling out of control at the pop-out endpoint.

[0011] According to the above technical solution, the auxiliary device includes a hollow tube, a sliding rod, a linkage plate, and a T-shaped rod. The hollow tube is fixedly installed on the inner wall of the mounting frame. The sliding rod slides through the inner and outer walls of the hollow tube. The linkage plate is fixedly installed on the surface of the sliding rod. The T-shaped rod is fixedly installed on the top of the linkage plate. The T-shaped rod contacts the inner wall of two C-shaped buckles. By evenly transmitting the supporting force to the bottom of the telescopic frame, it helps to improve the overall stability of movement, thereby improving the efficiency of maintenance.

[0012] According to the above technical solution, a fixing plate is fixedly installed on the surface of the linkage plate, and a rectangular piece is rotatably installed on the inner wall of the fixing plate. Several V-shaped pieces are fixedly installed on the inner wall of the hollow tube. The rectangular piece itself is elastic. By setting the rectangular piece with elasticity, it helps to extend the service life of the rectangular piece itself, thereby ensuring long-term use.

[0013] According to the above technical solution, the side of the rectangular piece away from the T-shaped rod is in contact with the inner wall of the fixed plate, and the side of the V-shaped piece close to the rectangular piece has an arc surface. By applying the continuous vibration generated by the collision to the telescopic frame, the telescopic frame is prevented from being exposed to rainwater for a long time, and the surface rusting will have an adverse effect on the movement.

[0014] This invention provides an early warning device for disaster prevention and mitigation monitoring. It has the following beneficial effects:

[0015] (1) The early warning device for disaster prevention and mitigation monitoring releases the limiting function by disengaging the card plate from the rectangular groove. By applying effective limiting to the filter plate, it can effectively resist the impact of falling rocks and strong winds on the tunnel entrance slope, preventing the filter plate from accidentally falling off and causing the disaster prevention and mitigation monitoring operation to fail. At the same time, the circular plate blocks part of the through holes on the lifting plate, accelerating the rise of the water level in the measuring cup. The drainage volume is dynamically adjusted by the lifting plate. The water level rise rate is positively correlated with the rainfall intensity, effectively shortening the alarm time and preventing the problem of delayed alarm caused by fixed drainage holes.

[0016] (2) In this early warning device for disaster prevention and mitigation monitoring, the rubber plate is closely attached to the circumference of the filter plate to apply flexible clamping to the filter plate. The rubber plate applies a stable clamping force to the filter plate, which not only ensures that the filter plate rises smoothly, but also prevents the filter plate from falling out of control at the pop-out endpoint. At the same time, the operator rotates the filter plate clockwise to complete the installation of the filter plate. By setting a second spring, the operator needs to apply a certain downward pressure when installing the filter plate to prevent the problem of improper installation caused by careless operation.

[0017] (3) The early warning device for disaster prevention and mitigation monitoring uses a T-shaped rod to evenly transmit the supporting force to the bottom of the telescopic frame. By evenly transmitting the supporting force to the bottom of the telescopic frame, it helps to improve the stability of the overall movement, thereby increasing the efficiency of maintenance. At the same time, the rectangular plate acts on the telescopic frame through the T-shaped rod. By acting on the telescopic frame with the continuous vibration generated by the collision, it prevents the telescopic frame from being exposed to rainwater for a long time and the surface from rusting, which would have an adverse effect on the movement. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the working scenario structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 3 This is a schematic diagram of the internal structure of the measuring cup of the present invention;

[0021] Figure 4 This is a schematic diagram of the mounting frame and card plate structure of the present invention;

[0022] Figure 5 This is a schematic diagram of a half-section of the mounting frame of the present invention;

[0023] Figure 6 For the present invention Figure 5 Enlarged structural diagram at point A in the middle;

[0024] Figure 7 This is a schematic diagram of the internal structure of the fixed tube and the hollow tube of the present invention;

[0025] Figure 8 For the present invention Figure 7 Enlarged structural diagram at point B.

[0026] In the diagram: 1. Support frame; 2. Displacement sensor; 3. Measuring cup; 4. Water level sensor; 5. Mounting frame; 6. Lifting plate; 7. Spring No. 1; 8. Circular plate; 9. Filter plate; 10. Clamping plate; 111. Fixing tube; 112. Telescopic frame; 113. Spring No. 2; 114. Contact tube; 115. Rubber plate; 116. Reset spring; 117. C-shaped buckle; 121. Hollow tube; 122. Sliding rod; 123. Linkage plate; 124. T-shaped rod; 125. Fixing plate; 126. Rectangular piece; 127. V-shaped piece. Detailed Implementation

[0027] 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figure 1 - Figure 8 One embodiment of the present invention is: an early warning device for disaster prevention and mitigation monitoring, comprising: a support frame 1, which is fixed to the slope at the tunnel entrance; a displacement sensor 2, which is fixedly installed at the bottom of the support frame 1, the displacement sensor 2 including a primary detection module and a primary communication module, wherein after the primary detection module of the displacement sensor 2 detects information, it sends an alarm to the monitoring platform through the primary communication module; a measuring cup 3, which is fixedly installed on the inner wall of the support frame 1; and a water level sensor 4, which is fixedly inserted through the measuring cup 3. The inner and outer walls of the measuring cup 3 include a water level sensor 4 comprising a second detection module and a second communication module; a mounting frame 5, which is fixedly installed inside the measuring cup 3; a lifting plate 6, which slides through the bottom of the mounting frame 5, and has several through holes for rainwater to pass through; a first spring 7, which is located between the lifting plate 6 and the mounting frame 5; and a circular plate 8, which is fixedly installed on the inner wall of the measuring cup 3, and has circular holes for rainwater to pass through. Rainwater is discharged through the through holes on the lifting plate 6 and the circular holes on the circular plate 8.

[0029] A filter plate 9 is installed on the top of the mounting frame 5. Rainwater enters the measuring cup 3 through the filter plate 9. The filter plate 9 blocks foreign objects in the rainwater. Two clamping plates 10 are fixedly installed on the surface of the filter plate 9. The filter plate 9 is in contact with the top of the measuring cup 3. A conical surface is opened at the bottom of the filter plate 9.

[0030] A rectangular groove is provided on the side of the mounting frame 5 near the card plate 10. The two card plates 10 are in contact with the inner wall of the rectangular groove. When the card plates 10 are no longer in contact with the rectangular groove, the limiting effect of the mounting frame 5 on the filter plate 9 in the vertical direction is released.

[0031] In this embodiment, rainwater enters the measuring cup 3 through the filter plate 9. The filter plate 9 blocks foreign objects in the rainwater, preventing impurities from entering the measuring cup 3 and affecting the measurement accuracy. When the rainfall is low, less rainwater enters the measuring cup 3, and most of the rainwater is quickly discharged through the through holes on the lifting plate 6 and the circular holes on the circular plate 8. At this time, the drainage rate is greater than the inflow rate, and there is no water accumulation in the measuring cup 3, so the water level sensor 4 does not trigger an alarm. When the rainfall intensity gradually increases, the amount of rainwater entering the measuring cup 3 exceeds the drainage capacity of the through holes, and rainwater begins to accumulate in the measuring cup 3. The pressure exerted by the rainwater on the lifting plate 6 increases accordingly, causing the lifting plate 6 to move downward under the pressure. The moving lifting plate 6 compresses the first spring 7, and at the same time, the lifting plate 6 moves down until it contacts the circular plate 8. At this time, the circular plate 8 blocks part of the through holes on the lifting plate 6, resulting in a decrease in the drainage rate, thereby accelerating the rise of the water level in the measuring cup 3. When the water level rises to a preset threshold, the second detection module of the water level sensor 4 detects a signal and triggers an alarm. The second communication module sends an alarm to the monitoring platform. The drainage volume is dynamically adjusted by the lifting plate 6. The water level rise rate is positively correlated with the rainfall intensity, effectively shortening the alarm time and preventing delayed alarms caused by fixed drainage holes. When the operator performs maintenance, the operator manually rotates the filter plate 9 counterclockwise. The rotation of the filter plate 9 causes the clamping plate 10 to move away from the rectangular groove. During the movement, the clamping plate 10 disengages from the rectangular groove, releasing the vertical limiting effect of the mounting frame 5 on the filter plate 9. The operator then pulls the filter plate 9 upwards, completely separating it from the mounting frame 5. At this time, the operator can perform maintenance or replacement on the filter plate 9. After maintenance, the filter plate 9 is reinserted into the mounting frame 5 and rotated clockwise, causing the clamping plate 10 to re-clamp into the rectangular groove, restoring the limiting state. By applying effective limiting to the filter plate 9, the impact of falling rocks and strong winds at the tunnel entrance slope can be effectively resisted, preventing the filter plate 9 from accidentally falling off and causing the disaster prevention and mitigation monitoring operation to fail.

[0032] Please see Figure 1 - Figure 8 Based on the above embodiments, in another embodiment of the present invention, the mounting frame 5 is provided with a pushing device for quickly disassembling the filter plate 9 and an auxiliary device for controlling the pushing speed. The pushing device includes a fixed tube 111, a telescopic frame 112, a second spring 113, and a contact tube 114. The stretched second spring 113 returns to its original position and pushes the telescopic frame 112 upward. The fixed tube 111 is fixedly installed inside the mounting frame 5. The telescopic frame 112 slides through the top of the fixed tube 111. The second spring 113 is disposed between the telescopic frame 112 and the fixed tube 111. The contact tube 114 is fixedly installed on the top of the telescopic frame 112. The telescopic frame 112 contacts the bottom of the filter plate 9. The movement of the telescopic frame 112 applies a pushing force to the bottom of the filter plate 9, causing the telescopic frame 112 to move and drive the filter plate 9 upward.

[0033] A rubber plate 115 slides through the inner and outer walls of the contact tube 114. A reset spring 116 is provided between the rubber plate 115 and the contact tube 114. When the deformed reset spring 116 returns to its original state, it causes the rubber plate 115 to move away from the contact tube 114. The side of the rubber plate 115 away from the reset spring 116 contacts the circumferential surface of the filter plate 9. A C-shaped buckle 117 is fixedly installed at the bottom of the telescopic frame 112.

[0034] The auxiliary device includes a hollow tube 121, a sliding rod 122, a linkage plate 123, and a T-shaped rod 124. When the sliding rod 122 moves, the hollow tube 121 provides support for the sliding rod 122. The hollow tube 121 is fixedly installed on the inner wall of the mounting frame 5. The sliding rod 122 slides through the inner and outer walls of the hollow tube 121. The linkage plate 123 is fixedly installed on the surface of the sliding rod 122. The T-shaped rod 124 is fixedly installed on the top of the linkage plate 123. The T-shaped rod 124 contacts the inner wall of two C-shaped buckles 117. The movement of the C-shaped buckles 117 drives the movement of the T-shaped rod 124, and the movement of the T-shaped rod 124 drives the movement of the linkage plate 123.

[0035] A fixed plate 125 is fixedly installed on the surface of the linkage plate 123. A rectangular piece 126 is rotatably installed on the inner wall of the fixed plate 125. When the linkage plate 123 moves, it also drives the fixed plate 125 to move upward. The movement of the fixed plate 125 drives the rectangular piece 126 to move upward. Several V-shaped pieces 127 are fixedly installed on the inner wall of the hollow tube 121. The rectangular piece 126 itself is elastic.

[0036] The side of the rectangular piece 126 away from the T-shaped rod 124 contacts the inner wall of the fixing plate 125. The side of the V-shaped piece 127 near the rectangular piece 126 has an arc surface. The arc surface of the V-shaped piece 127 applies resistance to the rectangular piece 126, and the rectangular piece 126 bends downward under the influence of the resistance.

[0037] In this embodiment, when the clamping plate 10 disengages from the rectangular groove, the stretched second spring 113 quickly returns to its original position. This return pushes the telescopic frame 112 upwards. The movement of the telescopic frame 112 applies a pushing force to the bottom of the filter plate 9, causing the filter plate 9 to move upwards, reducing the need for manual lifting. Simultaneously, the movement of the telescopic frame 112 causes the contact tube 114 and the C-shaped buckle 117 to move upwards together. The movement of the contact tube 114 causes the rubber plate 115 to move upwards, and the rubber plate 115 remains in close contact with the filter plate during this movement. The circumferential surface of the filter plate 9 is used to apply a flexible clamp to ensure that the filter plate 9 remains stable during its ascent. When the second spring 113 fully returns to its original position, the telescopic frame 112 stops moving, but the clamping force of the rubber plate 115 is maintained to prevent the filter plate 9 from accidentally falling off due to inertia. At this time, the operator can remove the filter plate 9. The filter plate 9 separates from the rubber plate 115 during the movement, causing the deformed reset spring 116 to return to its original position and drive the rubber plate 115 to move away from the contact tube 114. The rubber plate 115 applies a stable clamp to the filter plate 9. The force is designed to ensure the filter plate 9 rises smoothly while preventing it from falling uncontrollably at the ejection endpoint. During installation, the operator aligns the conical surface of the filter plate 9 downwards with the mounting frame 5 and slowly controls its downward movement. The conical surface of the filter plate 9 first contacts the rubber plate 115 and gradually compresses it, causing it to move towards the reset spring 116. This movement compresses the reset spring 116, and the deformed spring 116 generates a reverse elastic force, causing the rubber plate 115 to adhere tightly to the circular surface of the filter plate 9. The filter plate 9 continues to move downwards until it contacts the top of the telescopic frame 112, causing the filter plate 9 to move and drive the telescopic frame 112 to move downwards. The telescopic frame 112 moves and stretches the second spring 113. When the filter plate 9 contacts the mounting frame 5, the operator rotates the filter plate 9 clockwise so that the clamping plate 10 contacts the rectangular groove to complete the installation of the filter plate 9. By setting the second spring 113, the operator needs to apply a certain downward pressure when installing the filter plate 9 to prevent improper installation caused by careless operation.

[0038] When the C-shaped buckle 117 moves upward, it drives the T-shaped rod 124 upward. The movement of the T-shaped rod 124 drives the linkage plate 123 upward, which in turn drives the sliding rod 122 upward. As the sliding rod 122 moves, the hollow tube 121 provides support. Under this support, the sliding rod 122 improves the stability of the T-shaped rod 124. The T-shaped rod 124 evenly distributes the support force to the bottom of the telescopic frame 112, thus improving the stability of the telescopic frame 112 during movement. By evenly distributing the support force to the bottom of the telescopic frame 112, the overall stability of movement is improved, thereby increasing maintenance efficiency. When the linkage plate 123 moves, it also drives the fixed plate 125 upward. The movement of the fixed plate 125 drives the rectangular piece 126 upward. During movement, the rectangular piece 126 comes into contact with several V-shaped pieces 127. Each time it comes into contact, the curved surface of the V-shaped piece 127 applies resistance to the rectangular piece 126. The rectangular piece 126 bends downward due to the resistance. The bent rectangular piece 126 stores energy under the action of elasticity. When the rectangular piece 126 separates from the V-shaped piece 127, the deformed rectangular piece 126 quickly recovers and collides with the newly contacted V-shaped piece 127 to generate vibration. This causes the rectangular piece 126 to collide with multiple V-shaped pieces 127 to generate continuous vibration. The rectangular piece 126 applies the vibration to the telescopic frame 112 through the T-shaped rod 124. The telescopic frame 112 moves smoothly under the action of vibration. By applying the continuous vibration generated by the collision to the telescopic frame 112, the long-term exposure of the telescopic frame 112 to rainwater and the rusting of the surface are prevented from having an adverse effect on the movement.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An early warning device for disaster prevention and mitigation monitoring, characterized in that, Used for early warning of heavy rain, including: A support frame (1) is used to fix it to the slope; Displacement sensor (2), the displacement sensor (2) is fixedly installed at the bottom of the support frame (1), the displacement sensor (2) includes a first detection module and a first communication module; Measuring cup (3), which is fixedly installed on the inner wall of support frame (1); A water level sensor (4) is fixedly inserted through the inner and outer walls of the measuring cup (3). The water level sensor (4) includes a second detection module and a second communication module. A mounting bracket (5) is fixedly installed inside the measuring cup (3); The lifting plate (6) slides through the bottom of the mounting frame (5). The lifting plate (6) has several through holes for rainwater to pass through. Spring No. 1 (7) is disposed between the lifting plate (6) and the mounting frame (5); A circular plate (8) is fixedly installed on the inner wall of the measuring cup (3). A circular hole is provided on the circular plate (8) for rainwater to pass through. The top of the mounting frame (5) is provided with a filter plate (9), and two clamping plates (10) are fixedly installed on the surface of the filter plate (9). The filter plate (9) is in contact with the top of the measuring cup (3), and a conical surface is provided at the bottom of the filter plate (9). The mounting frame (5) is equipped with a pushing device for quickly removing the filter plate (9) and an auxiliary device for controlling the pushing speed. The pushing device includes a fixed tube (111), a telescopic frame (112), a second spring (113), and a contact tube (114). The fixed tube (111) is fixedly installed inside the mounting frame (5). The telescopic frame (112) slides through the top of the fixed tube (111). The second spring (113) is disposed between the telescopic frame (112) and the fixed tube (111). The contact tube (114) is fixedly installed on the top of the telescopic frame (112). The telescopic frame (112) contacts the bottom of the filter plate (9). A rubber plate (115) slides through the inner and outer walls of the contact tube (114). A reset spring (116) is provided between the rubber plate (115) and the contact tube (114). The side of the rubber plate (115) away from the reset spring (116) contacts the circumferential surface of the filter plate (9). A C-shaped buckle (117) is fixedly installed at the bottom of the telescopic frame (112). The auxiliary device includes a hollow tube (121), a sliding rod (122), a linkage plate (123), and a T-shaped rod (124). The hollow tube (121) is fixedly installed on the inner wall of the mounting frame (5). The sliding rod (122) slides through the inner and outer walls of the hollow tube (121). The linkage plate (123) is fixedly installed on the surface of the sliding rod (122). The T-shaped rod (124) is fixedly installed on the top of the linkage plate (123). The T-shaped rod (124) contacts the inner walls of two C-shaped buckles (117). A fixing plate (125) is fixedly installed on the surface of the linkage plate (123). A rectangular piece (126) is rotatably installed on the inner wall of the fixing plate (125). Several V-shaped pieces (127) are fixedly installed on the inner wall of the hollow tube (121). The rectangular piece (126) itself is elastic.

2. The early warning device for disaster prevention and mitigation monitoring according to claim 1, characterized in that: The mounting frame (5) has a rectangular groove on the side near the card plate (10), and the two card plates (10) are in contact with the inner wall of the rectangular groove.

3. The early warning device for disaster prevention and mitigation monitoring according to claim 2, characterized in that: The side of the rectangular piece (126) away from the T-shaped rod (124) is in contact with the inner wall of the fixing plate (125), and the side of the V-shaped piece (127) near the rectangular piece (126) has an arc surface.

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