Method for detecting inflammable gas in hazardous chemical substance storage area and detection alarm device

Abstract

The invention relates to the technical field of hazardous chemical substance storage areas, and discloses a hazardous chemical substance storage area inflammable gas detection method and a detection alarm device, and the detection alarm device comprises a device main body, a pressure reduction device, a balance device, a protection device and a reset device. According to the hazardous chemical substance storage area inflammable gas detection method and the detection alarm device, when encountering a strong storm, the balance between the bottom surface of an upper plate and a lower plate is broken and the upper plate begins to incline, and further when the upper plate inclines to form a radian, a support rod is converted from a vertical state to a bent state, so that the inflammable gas is detected; when the vertical plate slides downwards, the tail end of the shaft rod is driven to slide downwards synchronously, the tail end of the shaft rod is connected with the hydraulic rod, at the moment, the output end of the hydraulic rod is driven to be compressed, and when the external force is too large, the hydraulic rod is driven to be compressed; when the output end of the hydraulic rod is continuously pressed downwards and reaches the detection end of the sensor, the beneficial effects of monitoring the condition of the hazardous chemical substance storage area in real time and giving an alarm in time when external force is encountered are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of flammable gas detection, and in particular to a flammable gas detection method and a detection alarm device in a hazardous chemical storage area. Background Art

[0002] The hazardous chemicals storage area is used to store some hazardous chemicals. These chemicals are generally stored in strict sealed conditions, such as filling in pressure tanks. However, in order to further ensure safety, corresponding detection alarm devices must be installed in the storage area to detect the storage area and warn of the leakage of hazardous chemical gases.

[0003] There are many existing methods for real-time monitoring of hazardous chemical gases, mainly by installing corresponding detection equipment and alarm devices in the storage area. When flammable gases containing hazardous chemicals are detected in the air or the concentration of flammable gases exceeds the standard, an alarm is issued. However, due to the large area of ​​the storage area, the alarm alone cannot quickly assist in locating the leakage area. Maintenance personnel still need to conduct regional screening to ultimately determine the leakage area, resulting in a lack of timeliness. There is also a way to set up multiple detection devices and alarm equipment at different locations, but this method is very costly and not economical. Since the existing hazardous chemical storage area is not equipped with an alarm device, it is difficult to detect and repair it in time after damage. In addition, the alarm device in the hazardous chemical storage area usually needs to be replaced when a fault occurs, and the maintenance efficiency is low due to the need to report the replacement. Summary of the invention

[0004] Technical issues solved In view of the deficiencies in the prior art, the present invention provides a method and a detection alarm device for flammable gas in hazardous chemical storage areas, which have the advantages of being able to withstand strong external forces and not be damaged, being suitable for coastal areas, real-time monitoring of the hazardous chemical storage area, timely alarming when encountering external forces, and improving maintenance efficiency, thereby solving the above-mentioned technical problems.

[0005] Technical solution: In order to achieve the above-mentioned ability to withstand strong external forces without being damaged, suitable for coastal areas, real-time monitoring of hazardous chemical storage areas, timely alarm when encountering external forces, and improve maintenance efficiency, the present invention provides the following technical solutions: A flammable gas detection method and detection alarm device in hazardous chemical storage areas, including a device body, a pressure relief device, a balancing device, a protective device and a reset device. The device body includes a support rod and a detection device. The detection device is arranged on both sides of the top of the support rod. The side wall of the device body is provided with a pressure relief device. The pressure relief device includes an upper plate, a support rod, a groove, a rotating shaft, a lower plate and a socket. Support rods are arranged on both sides of the lower surface of the upper plate, a groove is arranged in the center of the lower surface of the upper plate, a rotating shaft is arranged on the inner side of the groove, the bottom of the rotating shaft is connected to the upper surface of the lower plate, and the socket is opened on both sides of the upper surface of the lower plate The support rod is inserted into the inner side, the balancing device is arranged at the bottom of the pressure reducing device, the balancing device includes a hinge, a bearing and a torsion spring, the hinge is arranged on the bottom surface of the support rod and a bearing is arranged at the middle end, the outer surface of the bearing is arranged with a torsion spring, the protective device is arranged at the tail end of the detection device, the protective device includes a cover plate, a vertical plate, a block and a slide groove, the cover plate is located above the detection device, the tail end of the cover plate is connected to the vertical plate, a block is arranged on one side of the rear wall of the vertical plate, the block is slidably connected to the slide groove opened on the side wall of the support rod, the reset device is arranged on the inner top of the support rod, the reset device includes a hydraulic rod, a shaft rod, a through groove, a sensor and a signal transmitter, the output end of the hydraulic rod is connected to the shaft rod, the shaft rod passes through the through groove opened on the side wall of the support rod, the tail end of the shaft rod is connected to the vertical plate, and the sensor is arranged at the bottom of the hydraulic rod and connected to the signal transmitter.

[0006] Preferably, the lower surface of the support rod is connected to the ground, and the detection device is symmetrically arranged on the four sides of the top of the side wall of the support rod.

[0007] Through the above technical solution, the detection devices on the four sides of the top of the support pole can maximize the lighting of the surrounding environment. At the same time, when energy saving is required, the detection devices in the area that does not need lighting can be turned off, and the detection devices in the area that needs lighting can be retained.

[0008] Preferably, the pressure reducing device is arranged around the side wall of the supporting rod, the head end of the supporting rod is connected to the front and rear ends of the lower surface of the upper plate, the tail end of the supporting rod is engaged with the socket and connected to the head end of the hinge, the groove is opened at the center of the bottom surface of the upper plate and fixedly connected to the top of the rotating shaft, and the sockets are symmetrically opened on both sides of the top surface of the lower plate.

[0009] Through the above technical solution, when the support pole encounters a strong storm, the airflow blows through the upper plate, and the balance between the bottom surface of the upper plate and the lower plate is broken and begins to tilt. Further, when the upper plate tilts, an arc is formed. At this time, the support pole changes from a vertical state to a bent state, and the swing amplitude of the upper plate is used to offset the strong external force impact, thereby preventing the support pole from being directly destroyed.

[0010] Preferably, the decompression device also includes the screw hole, a positioning plate and a screw, the screw hole is opened on the side wall of the supporting rod, the screw hole is located at the connection between the upper plate and the lower plate, the front wall of the positioning plate is threadedly connected to the screw at the head and tail ends, and the tail end of the screw is threadedly connected to the screw hole.

[0011] Through the above technical solution, when the decompression function of the upper plate is not needed, the positioning plate is used to fit the side wall of the support rod. Furthermore, since the screw holes are respectively opened at the top of the side wall of the upper plate and the top of the side wall of the lower plate, screws are used to thread the screw holes, and the upper plate and the lower plate are fixed using the positioning plate.

[0012] Preferably, both ends of the hinge are connected to the bottom surface of the support rod, the bearing is rotatably connected to the inner side of the lower plate and the outer shaft is wrapped around the middle end of the hinge, and the torsion spring is arranged on the inner side of the bearing and the head and tail ends are connected to the inner wall of the lower plate.

[0013] Through the above technical scheme, when the upper plate is tilted, the support rod at the other end of the inclined side of the upper plate is lifted upward, and the lifting of the support rod drives the hinge to move. Furthermore, since the hinge is wrapped around the bearing, when the hinge moves, it will drive the other end of the hinge to move by rotating the side wall of the bearing. When the other end of the hinge moves, it pulls the other end of the support rod connected to the top. At this time, as one side of the support rods on both sides rises and the other side falls, the bottom surface of the upper plate is driven to fit the top surface of the lower plate. At this time, the side wall of the support rod is in a bent state, and after the strong external force, the torsion spring releases the pressure to drive the bearing to reset. The further rotation of the bearing drives the hinge to move, so that the support rod drives the upper plate to reset.

[0014] Preferably, the cover plate is obliquely arranged on the top of the front wall of the vertical plate, the lower surface of the cover plate is connected to the detection device, and the vertical plate slides in the slide groove through a block arranged on the rear wall.

[0015] Through the above technical solution, the top of the detection device is protected by covering the detection device with a cover plate to prevent falling objects from high altitude. At the same time, since the cover plate is inclined, when typhoon weather comes, the cover plate converts the lateral impact of the external force into a vertical impact, forcing the vertical plate connected to the tail end to descend, and reducing the friction of the vertical plate under the action of the slide groove.

[0016] Preferably, the protective device is also provided with a backup detection device, and the backup detection device is arranged at the bottom of the front wall of the vertical plate.

[0017] Through the above technical solution, the spare detection device is of the same model as the detection device, and the spare detection device is placed in a sealed box at the bottom of the front wall of the vertical plate in a sealed form. When a detection device fails, the repair personnel will carry out repairs as quickly as possible to avoid carrying the detection device to take up space.

[0018] Preferably, the side wall of the output end of the hydraulic rod is rotationally connected to the tail end of the shaft rod, the middle end of the shaft rod is slidably connected to the through groove, the sensor is arranged at the bottom of the hydraulic rod and the output end is connected to the signal transmitter, the sensor and the signal transmitter are common devices on the market and no further explanation is given.

[0019] Through the above technical solution, when the vertical board slides down, the tail end of the shaft rod located on the rear wall of the vertical board is driven to slide down synchronously, and because the tail end of the shaft rod is connected to the hydraulic rod, the output end of the hydraulic rod is also driven to be compressed. When the external force is too large, as the output end of the hydraulic rod continues to press down and reaches the sensor detection end, the sensor sends an alarm signal to the signal transmitter, and the signal transmitter further sends the signal to the Internet terminal for early warning.

[0020] Compared with the prior art, the present invention provides a method and a detection alarm device for flammable gas in a hazardous chemical storage area, which has the following beneficial effects: 1. The flammable gas detection method and detection alarm device in the hazardous chemical storage area, when encountering a strong storm, the airflow blows through the upper plate, at this time the balance between the bottom surface of the upper plate and the lower plate is broken and begins to tilt, and further when the upper plate tilts, an arc is formed, at this time the support rod changes from a vertical state to a bent state, and the swing amplitude of the upper plate is used to offset the strong external force impact, avoiding the support rod from being directly destroyed, achieving the beneficial effect of being able to withstand strong external forces without being damaged and being suitable for coastal areas.

[0021] 2. The flammable gas detection method and detection alarm device in the hazardous chemical storage area is that when the vertical plate slides down, the tail end of the shaft rod located on the rear wall of the vertical plate is driven to slide down synchronously, and because the tail end of the shaft rod is connected to the hydraulic rod, the output end of the hydraulic rod is also driven to be compressed. When the external force is too large, as the output end of the hydraulic rod continues to press down and reaches the sensor detection end, the sensor sends an alarm signal to the signal transmitter, and the signal transmitter further sends the signal to the Internet terminal for early warning, thereby achieving the beneficial effect of real-time monitoring of the situation in the hazardous chemical storage area and timely alarm when encountering external force.

[0022] 3. The flammable gas detection method and detection alarm device in the hazardous chemical storage area use a backup detection device that is of the same model as the detection device. At the same time, the backup detection device is placed in a sealed box at the bottom of the front wall of the vertical plate in a sealed form. When a detection device fails, the repair personnel will carry out repairs as quickly as possible, thereby achieving the beneficial effect of improving maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic cross-sectional view of the overall structure of the present invention; Figure 3 It is a top view schematic diagram of the support rod structure of the present invention; Figure 4 This is a schematic diagram of the vertical plate structure of the present invention; Figure 5 It is a front cross-sectional schematic diagram of the support rod structure of the present invention; Figure 6 for Figure 2 A is an enlarged schematic diagram.

[0024] Among them: 1. Device body; 101. Support rod; 102. Detection device; 2. Pressure relief device; 201. Upper plate; 202. Support rod; 203. Groove; 204. Rotating shaft; 205. Lower plate; 206. Socket; 207. Screw hole; 208. Positioning plate; 209. Screw; 3. Balancing device; 301. Hinge; 302. Bearing; 303. Torsion spring; 4. Protective device; 401. Cover plate; 402. Vertical plate; 403. Block; 404. Slide; 405. Spare detection device; 5. Reset device; 501. Hydraulic rod; 502. Shaft rod; 503. Through slot; 504. Sensor; 505. Signal transmitter. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1-6A method and an alarm device for detecting flammable gas in a hazardous chemical storage area, comprising a device body 1, a decompression device 2, a balancing device 3, a protective device 4 and a reset device 5, wherein the device body 1 comprises a support rod 101 and a detection device 102, the detection device 102 is arranged on both sides of the top of the support rod 101, and a decompression device 2 is arranged on the side wall of the device body 1, and the decompression device 2 comprises an upper plate 201, a support rod 202, a groove 203, a rotating shaft 204, a lower plate 205 and a socket 206, support rods 202 are arranged on both sides of the lower surface of the upper plate 201, a groove 203 is arranged at the center of the lower surface of the upper plate 201, a rotating shaft 204 is arranged inside the groove 203, and the bottom of the rotating shaft 204 is connected to the upper surface of the lower plate 205, and the socket 206 is opened on both sides of the upper surface of the lower plate 205 and the support rod 202 is inserted inside, and the balancing device 3 is arranged at the bottom of the decompression device 2, and the balancing device comprises a hinge 301, a bearing 302 and a torsion spring 303, and the hinge 301 is provided with A bearing 302 is arranged at the bottom of the support rod 202 and at the middle end thereof, a torsion spring 303 is arranged on the outer surface of the bearing 302, a protective device 4 is arranged at the tail end of the detection device 102, the protective device 4 comprises a cover plate 401, a vertical plate 402, a block 403 and a slide groove 404, the cover plate 401 is located above the detection device 102, the tail end of the cover plate 401 is connected to the vertical plate 402, a block 403 is arranged on one side of the rear wall of the vertical plate 402, and the block 403 is slidably connected to the side wall of the support rod 101 The slide groove 404, the reset device 5 is arranged at the inner top of the support rod 101, the reset device 5 includes a hydraulic rod 501, an axle rod 502, a through groove 503, a sensor 504 and a signal transmitter 505, the output end of the hydraulic rod 501 is connected to the axle rod 502, the axle rod 502 passes through the through groove 503 opened on the side wall of the support rod 101, the tail end of the axle rod 502 is connected to the vertical plate 402, and the sensor 504 is arranged at the bottom of the hydraulic rod 501 and connected to the signal transmitter 505.

[0027] Specifically, the lower surface of the support rod 101 is connected to the ground, and the detection devices 102 are symmetrically arranged on the four sides of the top of the side wall of the support rod 101. The advantage is that the detection devices 102 on the four sides of the top of the support rod 101 can maximize the lighting of the surrounding environment. At the same time, when energy saving is needed, the detection devices 102 in the area that does not need lighting can be turned off, and the detection devices 102 in the area that needs lighting can be retained.

[0028] Specifically, the pressure reducing device 2 is arranged around the side wall of the supporting rod 101, the head end of the supporting rod 202 is connected to the front and rear ends of the lower surface of the upper plate 201, the tail end of the supporting rod 202 is clamped in the socket 206 and connected to the head end of the hinge 301, the groove 203 is opened at the center of the bottom surface of the upper plate 201 and fixedly connected to the top of the rotating shaft 204, and the socket 206 is symmetrically opened on both sides of the top surface of the lower plate 205. The advantage is that when the supporting rod 101 encounters a strong storm, the airflow blows through the upper plate 201. At this time, the balance between the bottom surface of the upper plate 201 and the lower plate 205 is broken and begins to tilt. Further, when the upper plate 201 tilts, an arc is formed. At this time, the supporting rod 101 changes from a vertical state to a bent state, and the swing amplitude of the upper plate 201 is used to offset the strong external force impact, thereby avoiding the supporting rod 101 from being directly destroyed.

[0029] Specifically, the decompression device also includes a screw hole 207, a positioning plate 208 and a screw 209. The screw hole 207 is opened on the side wall of the support rod 101, and the screw hole 207 is located at the connection between the upper plate 201 and the lower plate 205. The front wall of the positioning plate 208 is threadedly connected to the screw 209 at both ends, and the tail end of the screw 209 is threadedly connected to the screw hole 207. The advantage is that when the decompression function of the upper plate 201 is not needed, the positioning plate 208 is used to fit the side wall of the support rod 101. Furthermore, since the screw holes 207 are respectively opened on the top of the side wall of the upper plate 201 and the top of the side wall of the lower plate 205, the screw 209 is used to thread the screw hole 207, and the positioning plate 208 is used to fix the upper plate 201 and the lower plate 205.

[0030] Specifically, both ends of the hinge 301 are connected to the bottom surface of the support rod 202, the bearing 302 is rotatably connected to the inner side of the lower plate 205 and is wound around the outer axis to connect the middle end of the hinge 301, and the torsion spring 303 is arranged on the inner side of the bearing 302 and is connected to the inner wall of the lower plate 205 at both ends. The advantage is that when the upper plate 201 is tilted, the support rod 202 at the other end of the tilted side of the upper plate 201 is lifted upward, and the hinge 301 is moved due to the lifting of the support rod 202. Furthermore, since the hinge 301 is wound around the bearing 302, the hinge 301 will move when it moves. By rotating the side wall of the bearing 302, the hinge 301 at the other end is driven to move. When the hinge 301 at the other end moves, it pulls the other end support rod 202 connected to the top. At this time, as one side of the support rods 202 rises and the other side falls, the bottom surface of the upper plate 201 is driven to fit the top surface of the lower plate 205. At this time, the side wall of the support rod 101 is in a bent state, and after a strong external force, the torsion spring 303 releases the pressure to drive the bearing 302 to reset. The bearing 302 further rotates to drive the hinge 301 to move, so that the support rod 202 drives the upper plate 201 to reset.

[0031] Specifically, the cover plate 401 is tilted at the top of the front wall of the vertical plate 402, the lower surface of the cover plate 401 is connected to the detection device 102, and the vertical plate 402 slides in the slide groove 404 through the block 403 set on the rear wall. The advantage is that the detection device 102 is covered by the cover plate 401 to protect the top of the detection device 102 to prevent falling objects from high altitude. At the same time, since the cover plate 401 is tilted, when typhoon weather comes, the cover plate 401 converts the lateral impact of the external force into a vertical impact, forcing the vertical plate 402 connected to the tail end to descend, and the friction of the vertical plate 402 is reduced under the action of the slide groove 404.

[0032] Specifically, the protective device 4 is also provided with a spare detection device 405, and the spare detection device 405 is arranged at the bottom of the front wall of the vertical plate 402. The advantage is that the spare detection device 405 is of the same model as the detection device 102, and the spare detection device 405 is placed in a sealed form in a sealed box at the bottom of the front wall of the vertical plate 402. When the detection device 101 fails, the repair personnel will carry out repairs as quickly as possible to avoid carrying the detection device to occupy space.

[0033] Specifically, the side wall of the output end of the hydraulic rod 501 is rotatably connected to the tail end of the shaft rod 502, and the middle end of the shaft rod 502 is slidably connected to the through groove 503. The sensor 504 is arranged at the bottom of the hydraulic rod 501 and the output end is connected to the signal transmitter 505. The sensor 504 and the signal transmitter 505 are both common devices on the market and will not be explained in detail. The advantage is that when the vertical plate 402 slides down, the tail end of the shaft rod 502 located on the rear wall of the vertical plate 402 is driven to slide down synchronously, and because the tail end of the shaft rod 502 is connected to the hydraulic rod 501, the output end of the hydraulic rod 501 is also driven to be compressed. When the external force is too large, as the output end of the hydraulic rod 501 continues to press down when it reaches the detection end of the sensor 504, the sensor 504 sends an alarm signal to the signal transmitter 505, and the signal transmitter 505 further sends the signal to the Internet terminal for early warning.

[0034] When in use, when a strong external force blows the support rod 101 to drive the upper plate 201 to tilt, the support rod 202 at the other end of the tilted side of the upper plate 201 is lifted upward, and the lifting of the support rod 202 drives the hinge 301 to move. Furthermore, since the hinge 301 is wrapped around the bearing 302, when the hinge 301 moves, it will drive the other end hinge 301 to move by rotating the side wall of the bearing 302. When the other end hinge 301 moves, it pulls the other end support rod 202 connected to the top. At this time, as the support rods 202 on both sides rise on one side and fall on the other side, the bottom surface of the upper plate 201 is driven to fit the top surface of the lower plate 205. At this time, the side wall of the support rod 101 is in a bent state, and after the strong external force, the torsion spring 303 releases the pressure to drive the bearing 302 to reset, and the bearing 302 further rotates to drive the hinge 301 to move, so that the support rod 202 drives the upper plate 201 to reset, and covers the detection device 102 through the cover plate 401 to protect the top of the detection device 102 to prevent falling objects from high altitude. At the same time, since the cover plate 401 is inclined, when typhoon weather comes, the cover plate 401 converts the lateral impact of the external force into a vertical impact, and presses the vertical plate 402 connected at the tail end to descend. When the vertical plate 402 slides down, the tail end of the shaft rod 502 located on the rear wall of the vertical plate 402 is driven to slide down synchronously, and since the tail end of the shaft rod 502 is connected to the hydraulic rod 501, the output end of the hydraulic rod 501 is also driven to be compressed. When the external force is too large, as the output end of the hydraulic rod 501 continues to press down when it reaches the detection end of the sensor 504, the sensor 504 sends an alarm signal to the signal transmitter 505, and the signal transmitter 505 further sends the signal to the Internet terminal for early warning.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flammable gas detection alarm device for hazardous chemicals storage areas, comprising a device body (1), a pressure reducing device (2), a balancing device (3), a protective device (4) and a reset device (5), characterized in that: The device body (1) comprises a support rod (101) and a detection device (102), wherein the detection device (102) is arranged on both sides of the top of the support rod (101), and a pressure relief device (2) is arranged on the side wall of the device body (1), wherein the pressure relief device (2) comprises an upper plate (201), a support rod (202), a groove (203), a rotating shaft (204), a lower plate (205) and a socket (206), wherein the support rods (202) are arranged on both sides of the lower surface of the upper plate (201), and the groove (203) is arranged at the center of the lower surface of the upper plate (201). ), a rotating shaft (204) is arranged inside the groove (203), the bottom of the rotating shaft (204) is connected to the upper surface of the lower plate (205), the plug hole (206) is opened on both sides of the upper surface of the lower plate (205) and the support rod (202) is inserted inside, the balancing device (3) is arranged at the bottom of the pressure reducing device (2), the balancing device comprises a hinge (301), a bearing (302) and a torsion spring (303), the hinge (301) is arranged on the bottom surface of the support rod (202) and the bearing (302) is arranged at the middle end, and the outer surface of the bearing (302) is provided with A torsion spring (303) is arranged, the protective device (4) is arranged at the rear end of the detection device (102), the protective device (4) comprises a cover plate (401), a vertical plate (402), a block (403) and a slide groove (404), the cover plate (401) is located above the detection device (102), the rear end of the cover plate (401) is connected to the vertical plate (402), a block (403) is arranged on one side of the rear wall of the vertical plate (402), the block (403) is slidably connected to the slide groove (404) provided on the side wall of the support rod (101), and the reset device (5) The reset device (5) is arranged at the top of the inner side of the support rod (101), and comprises a hydraulic rod (501), an axle rod (502), a through slot (503), a sensor (504) and a signal transmitter (505). The output end of the hydraulic rod (501) is connected to the axle rod (502), the axle rod (502) passes through the through slot (503) provided on the side wall of the support rod (101), the rear end of the axle rod (502) is connected to the vertical plate (402), and the sensor (504) is arranged at the bottom of the hydraulic rod (501) and connected to the signal transmitter (505).

2. A flammable gas detection alarm device for hazardous chemicals storage areas according to claim 1, characterized in that: The lower surface of the support rod (101) is connected to the ground, and the detection device (102) is symmetrically arranged on four sides of the top of the side wall of the support rod (101).

3. The flammable gas detection alarm device for hazardous chemicals storage area according to claim 1 is characterized by: The pressure reducing device (2) is arranged around the side wall of the support rod (101), the head end of the support rod (202) is connected to the front and rear ends of the lower surface of the upper plate (201), the tail end of the support rod (202) is clamped in the socket (206) and connected to the head end of the hinge (301), the groove (203) is opened at the center of the bottom surface of the upper plate (201) and is fixedly connected to the top of the rotating shaft (204) inside, and the socket (206) is symmetrically opened on both sides of the top surface of the lower plate (205).

4. The flammable gas detection alarm device for hazardous chemicals storage area according to claim 1 is characterized by: The decompression device further comprises the screw hole (207), a positioning plate (208) and a screw (209); the screw hole (207) is formed on a side wall of the support rod (101); the screw hole (207) is located at a connection between the upper plate (201) and the lower plate (205); the front wall of the positioning plate (208) is threadedly connected to the screw (209) at its front and rear ends; and the rear end of the screw (209) is threadedly connected to the screw hole (207).

5. The flammable gas detection alarm device for hazardous chemicals storage area according to claim 1 is characterized by: The hinge (301) has two ends connected to the bottom surface of the support rod (202), the bearing (302) is rotatably connected to the inner side of the lower plate (205) and is externally axially wound around the middle end of the hinge (301), and the torsion spring (303) is arranged on the inner side of the bearing (302) and is connected to the inner wall of the lower plate (205) at both ends.

6. The flammable gas detection alarm device for hazardous chemicals storage area according to claim 1 is characterized by: The cover plate (401) is arranged obliquely on the top of the front wall of the vertical plate (402); the lower surface of the cover plate (401) is connected to the detection device (102); and the vertical plate (402) slides in the slide groove (404) through a clamping block (403) arranged on the rear wall.

7. The flammable gas detection alarm device for hazardous chemicals storage area according to claim 1 is characterized by: The protective device (4) is also provided with a backup detection device (405), and the backup detection device (405) is arranged at the bottom of the front wall of the vertical plate (402).

8. The flammable gas detection alarm device for hazardous chemicals storage area according to claim 1 is characterized by: The side wall of the output end of the hydraulic rod (501) is rotatably connected to the tail end of the shaft rod (502), the middle end of the shaft rod (502) is slidably connected to the through groove (503), and the sensor (504) is arranged at the bottom of the hydraulic rod (501) and the output end is connected to the signal transmitter (505).

9. A method for detecting flammable gas in a hazardous chemicals storage area according to claim 1, characterized in that: The following steps are included Step 1: First, lay the exhaust and alarm modules on the roof of the storage area. The adjacent exhaust and alarm modules should be laid at equal distances, and the final distribution pattern of the exhaust and alarm modules should be determined according to the room type of the civil engineering design of the storage area. Install the detection device at the relative center of the roof of the storage area, and the interface of the detection device must be connected to the exhaust pipe of the exhaust and alarm module through a slender hose; Step 2: The exhaust fan will extract air from various parts of the storage area, and the airflow will enter the exhaust pipe and then be transported to the air duct through the slender hose and the inner cavity of the conductive detection device. The airflow will flow through the gas detection sensor and be checked by the gas detection sensor. If the flammable gas contained in the airflow exceeds the standard, the processor and controller module will control the electromagnet to energize, and the interface selection cover originally located at the relatively lower part of the inner cavity of the detection device will be magnetically attracted upward by the electromagnet, and the interface selection cover will partially block the interfaces distributed on the surface of the detection device, leaving only one conductive interface. Step 3: The motor controls the interface selection cover to rotate, and switches the interfaces to be turned on one by one, so that the detection device checks the airflow sucked by a single exhaust and alarm module one by one, that is, the gas in each part of the storage area is screened one by one until all the screening is completed; Step 4: The processor and controller module compare the concentration of flammable gas in each part of the gas, obtain the storage area corresponding to the gas with the highest concentration, and control the alarm light and buzzer on the gas extraction and alarm module of that part to flash and sound an alarm respectively.

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