Handheld hazardous gas detection set

Abstract

The invention discloses a handheld hazardous gas detection kit, which comprises a shell, a dustproof net, a gas suction mechanism, a gas detection mechanism, a storage battery, a controller, a gas storage tank, a switch group, a display panel, a material storage shell, a cover plate and a handle, and is characterized in that the dustproof net is slidably mounted at one end of the shell, and the gas suction mechanism is arranged on one side of the dustproof net; a gas detection mechanism is fixed to one end of the shell, a handle, a display panel and a storage shell are fixed to the outer side face of the shell, and a cover plate is buckled to the outer side face of the storage shell; a storage battery, a controller and an air storage tank are fixed in the handle, and a switch set is fixed to the outer side face of the handle. When the dust screen is used, the using effect of the dust screen can be guaranteed, secondly, single dangerous components in gas can be conveniently detected, various dangerous components in the gas can be detected at the same time, in addition, a gas detection sensor can be conveniently replaced, and finally, the gas at the position of the gas detection sensor can be cleaned.

Description

Technical Field

[0001] This invention relates to the field of gas detection technology, specifically a handheld hazardous gas detection kit. Background Technology

[0002] In many fields such as industrial production, environmental monitoring, and emergency rescue, handheld hazardous gas detection kits are important devices used to detect the composition and concentration of harmful gases in the environment in real time. By detecting hazardous gases, they can provide safety warnings for workers, prevent safety accidents such as poisoning and explosions caused by inhaling harmful gases, and ensure the safety of personnel and the smooth progress of production activities.

[0003] Currently, most handheld hazardous gas detection kits on the market consist of a housing, a gas detection sensor, a suction device, a power module, and a display module. The housing protects the internal components, the suction device introduces external gas into the detection area, the gas detection sensor detects the gas composition and concentration, and the detection data is presented to the user through the display module. However, existing detection kits of this type have many shortcomings in practical applications.

[0004] Firstly, regarding air intake dust prevention, traditional detection kits typically use fixed-installation dust filters. Over time, dust accumulates on the filter surface, reducing intake efficiency and affecting the timeliness and accuracy of gas detection. Cleaning requires manual disassembly, which is cumbersome and increases operating costs and maintenance difficulty. Secondly, in terms of gas detection functionality, traditional detection kits can only detect single types of hazardous gases. Detecting multiple hazardous gas components requires multiple detectors of different types. Even if some devices have multi-component detection capabilities, the switching process is complex and requires professional personnel, making it difficult to meet the rapid response needs of emergency detection scenarios. Furthermore, existing gas detection sensors are mostly fixed-installation. If a sensor malfunctions or its performance deteriorates, replacement is difficult and can easily damage other components, further increasing maintenance costs and downtime. Finally, after a gas detection, existing kits cannot clean residual gas in the detection area. Residual gas not only affects the accuracy of subsequent detections but may also corrode the sensor, shortening its lifespan.

[0005] Therefore, it is very necessary to invent a handheld hazardous gas detection kit. Summary of the Invention

[0006] The purpose of this invention is to provide a handheld hazardous gas detection kit to solve the following problems of existing hazardous gas detection kits: First, dust accumulates on the dustproof screen, which reduces the air intake efficiency and affects the timeliness and accuracy of detection. Second, it can only detect a single type of hazardous gas. To detect multiple hazardous gas components, multiple different types of detectors are required. In addition, the gas detection sensor is fixedly installed, making replacement difficult. Finally, after completing a gas detection, existing detection kits cannot clean the residual gas in the detection area.

[0007] To achieve the above objectives, the present invention provides the following technical solution: comprising a housing, a dustproof net, an air intake mechanism, a gas detection mechanism, a battery, a controller, a gas storage tank, a switch assembly, a display panel, a storage shell, a cover plate, and a handle. A dustproof net is slidably installed at one end of the housing, and an air intake mechanism is provided on one side of the dustproof net, which is fixed inside the housing by bolts. A gas detection mechanism is threadedly fixed to the end of the housing away from the dustproof net, and the detection end of the gas detection mechanism is located inside the housing. A handle is bolted to the outer side of the housing, and the battery, controller, and gas storage tank are bolted to the inside of the handle, with the output end of the gas storage tank located inside the housing. A switch assembly is bolted to the outer side of the handle, and the switch assembly is electrically connected to the controller via a data cable. The controller is electrically connected to the air intake mechanism, the gas detection mechanism, the battery, the gas storage tank, and the display panel via data cables. A display panel and a storage shell are bolted to the outer side of the housing, and a cover plate is fastened to the outer side of the storage shell.

[0008] Furthermore, the suction mechanism includes a micro servo motor, a transmission column, a positioning frame, and a fan body. The micro servo motor is fixed inside the housing by bolts, and its output end is rotatably connected to the housing via a support bearing. The output end of the micro servo motor is also connected to the transmission column via two meshing bevel gears. The transmission column is rotatably connected to the positioning frame via a support bearing, and the positioning frame is fixed to the inner wall of the housing by bolts. One end of the transmission column is fixed with a fan body by bolts, and the fan body is movably disposed inside the housing. The micro servo motor is electrically connected to the controller via a data cable. This configuration enables external gas to be delivered to the gas detection mechanism.

[0009] Furthermore, a turntable is bolted to the end of the transmission column away from the fan body. The turntable is located on one side of the dustproof net, and its outer edge is rotatably connected to the inner wall of the outer casing via a support bearing. A first magnet and a second magnet are bolted to the side of the turntable closest to the dustproof net, with opposite polarities. A third magnet and a fourth magnet are bolted to the side of the dustproof net closest to the turntable, with opposite polarities. The first and third magnets have the same polarity, and the second and fourth magnets have the same polarity. This arrangement allows the dustproof net to reciprocate under the drive of the suction mechanism, thereby causing the dust on the dustproof net to fall off.

[0010] Furthermore, the gas detection mechanism includes a mounting frame, a fixing frame, a gas detection sensor, a rotating hole, a rotating column, a baffle, and a vent. The mounting frame is fixed inside the housing by threaded engagement, and a fixing frame is welded to the side of the mounting frame near the suction mechanism. Several different types of gas detection sensors are evenly embedded on the side of the fixing frame away from the mounting frame, and the side of the fixing frame away from the mounting frame is fitted against the baffle. The baffle is rotatably connected to the inner wall of the housing by a sealed bearing, and a vent is formed through the interior of the baffle, the diameter of which is smaller than the size of the gas detection sensor. A rotating column is welded to the side of the baffle, and the rotating column is rotatably installed inside the rotating hole, which is formed through the middle of the mounting frame and the fixing frame. This arrangement not only facilitates the detection of a single hazardous component in the gas but also enables the detection of multiple hazardous components in the gas.

[0011] Furthermore, the mounting brackets are printed with scale lines corresponding to the positions of the gas detection sensors, and the rotating column is printed with scale lines corresponding to the positions of the vents. This arrangement makes it easier for users to determine the positions of the vents.

[0012] Furthermore, the mounting bracket includes a frame, slots, a sixth magnet, a first energized contact, and a sealing gasket. The frame is fixed to the side of the mounting bracket by welding, and several slots are provided on the side of the frame away from the mounting bracket. The sixth magnet and the first energized contact are fixed inside each slot, and the first energized contact is electrically connected to the controller via a data cable. A sealing gasket is fixed on the side of the frame near the baffle, and a rotating hole is provided through the middle of the frame. The gas detection sensor includes a sensor body, a seventh magnet, a second energized contact, and a pick-and-place slot. The seventh magnet and the second energized contact are fixed on the side of the sensor body, and the positions of the seventh magnet and the second energized contact correspond to the positions of the corresponding sixth magnet and the first energized contact, respectively. The second energized contact is electrically connected to the sensor body. A pick-and-place slot is provided at the edge of the sensor body. This design facilitates the replacement of the gas detection sensor.

[0013] Furthermore, the gas storage tank includes a tank body, an exhaust pipe, a first solenoid valve, an inlet pipe, and a second solenoid valve. The tank body is fixed inside the handle with bolts, and the exhaust pipe is fixed to the upper end of the tank body via a connector. The first solenoid valve is fixed to the middle of the exhaust pipe. The end of the exhaust pipe away from the tank body is located between the mounting bracket and the baffle. The inlet pipe is fixed to the outer side of the tank body via a connector, and the second solenoid valve is fixed to the other end of the inlet pipe. The second solenoid valve is located on the outside of the handle. The interior of the tank body is filled with high-pressure inert gas. Both the first and second solenoid valves are electrically connected to the controller via data lines. This configuration allows the remaining gas at the gas detection sensor location to be cleaned with inert gas after gas detection is completed.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] When external gas is delivered to the gas detection mechanism via the suction mechanism, the turntable rotates. With the cooperation of the first, second, third, and fourth magnets, the dust screen moves back and forth, causing dust to fall off. Furthermore, the gas detection mechanism facilitates the detection of not only a single hazardous component in the gas but also multiple hazardous components simultaneously. Additionally, the gas detection sensor inside the mechanism is easy to replace. Finally, the gas storage tank allows for the introduction of inert gas between the mounting bracket and the baffle after gas detection, thus cleaning any remaining gas at the gas detection sensor location. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of the present invention from a first perspective.

[0017] Figure 2 This is a structural schematic diagram of the invention from a second perspective.

[0018] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0019] Figure 4 This is a schematic diagram of the air intake mechanism of the present invention.

[0020] Figure 5 This is a schematic diagram of the structure of the turntable, the first magnet, and the second magnet of the present invention.

[0021] Figure 6 This is a schematic diagram of the structure of the dustproof net, the third magnet, and the fourth magnet of the present invention.

[0022] Figure 7 This is a schematic diagram of the exploded structure of the gas detection mechanism of the present invention.

[0023] Figure 8 This is a schematic diagram of the structure of the fixing frame of the present invention.

[0024] Figure 9 This is a schematic diagram of the structure of the gas detection sensor of the present invention.

[0025] Figure 10 This is a schematic diagram of the structure of the gas storage tank of the present invention.

[0026] In the picture:

[0027] 1-Outer casing, 2-Dustproof net, 3-Suction mechanism, 31-Miniature servo motor, 32-Transmission column, 33-Positioning frame, 34-Fan body, 4-Gas detection mechanism, 41-Mounting frame, 42-Fixing frame, 421-Frame body, 422-Slot, 423-Sixth magnet, 424-First energizing contact, 425-Sealing gasket, 43-Gas detection sensor, 431-Sensor body, 432-Seventh magnet, 433-Second energizing contact, 434 - Picking and placing slot, 44- Rotating hole, 45- Rotating column, 46- Baffle, 47- Vent hole, 5- Battery, 6- Controller, 7- Gas tank, 71- Tank body, 72- Exhaust pipe, 73- First solenoid valve, 74- Inlet pipe, 75- Second solenoid valve, 8- Switch group, 9- Display panel, 10- Storage shell, 11- Cover plate, 12- Handle, 13- Turntable, 14- First magnet, 15- Second magnet, 16- Third magnet, 17- Fourth magnet. Detailed Implementation

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0029] As attached Figure 1-10 As shown:

[0030] This invention provides a handheld hazardous gas detection kit, comprising a shell 1, a dustproof net 2, a suction mechanism 3, a gas detection mechanism 4, a battery 5, a controller 6, a gas storage tank 7, a switch assembly 8, a display panel 9, a storage shell 10, a cover plate 11, and a handle 12. A dustproof net 2 is slidably mounted on one end of the shell 1. The dustproof net 2 is a mesh structure woven from stainless steel wire, and its edges are fixed with a frame. A suction mechanism 3 is located on one side of the dustproof net 2 and is bolted to the inside of the shell 1. A gas detection mechanism 4 is threadedly fixed to the end of the shell 1 away from the dustproof net 2, and the detection end of the gas detection mechanism 4 is located inside the shell 1. The outer surface of the shell 1 is... A handle 12 is bolted to the outside of the housing 1. Inside the handle 12, a battery 5, a controller 6, and a gas tank 7 are bolted together. The output end of the gas tank 7 is located inside the housing 1. A switch assembly 8 is bolted to the outside of the handle 12. The switch assembly 8 is electrically connected to the controller 6 via a data cable. The controller 6 is electrically connected to the suction mechanism 3, the gas detection mechanism 4, the battery 5, the gas tank 7, and the display panel 9 via data cables. The display panel 9 and the storage shell 10 are bolted to the outside of the housing 1. A cover plate 11 is fastened to the outside of the storage shell 10. The battery 5 is a 3000mAh lithium-ion battery pack. The controller 6 is an ARM Cortex-M series microcontroller. The display panel 9 is a TFT color LCD screen with a resolution of (480×320).

[0031] Specifically, the suction mechanism 3 includes a micro servo motor 31, a transmission column 32, a positioning frame 33, and a fan body 34. The micro servo motor 31 is fixed inside the housing 1 by bolts. The output end of the micro servo motor 31 is rotatably connected to the housing 1 through a support bearing, and the output end of the micro servo motor 31 is connected to the transmission column 32 through two bevel gears. The transmission column 32 is rotatably connected to the positioning frame 33 through a support bearing, and the positioning frame 33 is fixed to the inner wall of the housing 1 by bolts. One end of the transmission column 32 is fixed to the fan body 34 by bolts. The fan body 34 is movably disposed inside the housing 1 and is an axial flow fan body made of engineering plastic (polycarbonate). The micro servo motor 31 is electrically connected to the controller 6 through a data cable. The micro servo motor 31 is a Maxon EC 16 series micro servo motor. In use, the micro servo motor 31 can drive the transmission column 32 and the fan body 34 to rotate accordingly under the control of the controller 6, thereby delivering external gas to the gas detection mechanism 4 through the rotation of the fan body 34.

[0032] Specifically, a turntable 13 is bolted to the end of the transmission column 32 away from the fan body 34. The turntable 13 is located on one side of the dustproof net 2, and its outer edge is rotatably connected to the inner wall of the outer casing 1 via a support bearing. A first magnet 14 and a second magnet 15 are bolted to the side of the turntable 13 near the dustproof net 2, with opposite polarities. A third magnet 16 and a fourth magnet 17 are bolted to the side of the dustproof net 2 near the turntable 13, with opposite polarities. The first magnet 14 and the third magnet 16 have the same polarity, and the second magnet 15 and the fourth magnet 17 have the same polarity. In use, the turntable 13 can... Driven by the transmission column 31 and the drive column 32, the first magnet 14 and the second magnet 15 will rotate accordingly. When the first magnet 14 moves to the side of the third magnet 16 and the second magnet 15 moves to the side of the fourth magnet 17, the first magnet 14 and the second magnet 15 can attract the third magnet 16 and the fourth magnet 17, thereby driving the dustproof net 2 closer to the turntable 13. When the first magnet 14 moves to the side of the fourth magnet 17 and the second magnet 15 moves to the side of the third magnet 16, the first magnet 14 and the second magnet 15 can repel the third magnet 16 and the fourth magnet 17, thereby causing the dustproof net 2 to move away from the turntable 13. Then, through the reciprocating movement of the dustproof net 2, the dust on the dustproof net 2 will fall off.

[0033] Specifically, the gas detection mechanism 4 includes a mounting bracket 41, a fixing bracket 42, a gas detection sensor 43, a rotating hole 44, a rotating column 45, a baffle 46, and a vent 47. The mounting bracket 41 is fixed inside the housing 1 by threaded engagement, and the fixing bracket 42 is welded to the side of the mounting bracket 41 near the suction mechanism 3. Several different types of gas detection sensors 43 are evenly embedded on the side of the fixing bracket 42 away from the mounting bracket 41, and the side of the fixing bracket 42 away from the mounting bracket 41 is fitted against the baffle 46. The baffle 46 is rotatably connected to the inner wall of the housing 1 by a sealed bearing, and a vent 47 is opened through the inside of the baffle 46. The diameter of the vent 47 is smaller than the size of the gas detection sensor 43. The rotating column 45 is welded to the side of the baffle 46. 5. The rotating device is installed inside the rotating hole 44, which is opened through the middle of the mounting bracket 41 and the fixing bracket 42. When it is necessary to detect a single hazardous component in the gas, the vent 47 can be moved to the side of the corresponding gas detection sensor 43 by manually rotating the rotating column 45. This allows the gas delivered by the suction mechanism 3 to contact the gas detection sensor 43 alone, and thus detect the gas by the gas detection sensor 43 alone. When it is necessary to detect multiple hazardous components in the gas, the mounting bracket 41 can be manually rotated to move the fixing bracket 42 away from the baffle 46. This allows the gas passing through the vent 7 to contact multiple gas detection sensors 43, and thus detect the hazardous components in the gas by the multiple gas detection sensors 43.

[0034] Specifically, the mounting bracket 41 is printed with scale lines corresponding to the position of the gas detection sensor 43, and the rotating column 44 is printed with scale lines corresponding to the position of the vent 47. With this setup, the position of the vent 47 can be determined by observing the scale lines on the rotating column 44 and the mounting bracket 41.

[0035] Specifically, the mounting bracket 42 includes a frame 421, slots 422, a sixth magnet 423, a first energized contact 424, and a sealing gasket 425. The frame 421 is fixed to the side of the mounting bracket 41 by welding, and several slots 422 are provided on the side of the frame 421 away from the mounting bracket 41. The sixth magnet 423 and the first energized contact 424 are fixed inside each slot 422, wherein the first energized contact 424 is electrically connected to the controller 6 via a data cable. A sealing gasket 425 is fixed on the side of the frame 421 near the baffle 46, and a rotating hole 44 is provided through the middle of the frame 421. The gas detection sensor 43 includes a sensor body 431, a seventh magnet 432, a second energized contact 433, and a pick-and-place slot 434. The seventh magnet 432 and the second energized contact 433 are fixed on the side of the sensor body 431, respectively, wherein the positions of the seventh magnet 432 and the second energized contact 433 are respectively connected to the corresponding sixth magnet 423 and the first energized contact 424. A first energized contact 424 is positioned accordingly, and a second energized contact 433 is electrically connected to the sensor body 431. Both the first energized contact 424 and the second energized contact 433 are made of silver-plated copper alloy. A pick-and-place slot 434 is provided on the edge of the sensor body 431. The sensor body 431 is an electrochemical sensor (for CO, H2S, O2), a catalytic combustion sensor (for combustible gases), an infrared sensor (for CO2, CH4), and a photoionization detector (PID, VOCs). In use, the gas detection sensor 43 can be placed into the corresponding slot 422 through the pick-and-place slot 434. The position of the gas detection sensor 43 is fixed by the cooperation of the sixth magnet 423 and the seventh magnet 432. Furthermore, the first energized contact 424 and the second energized contact 433 can be fitted together, thereby transmitting the data detected by the sensor body 431 to the controller 6.

[0036] Specifically, the gas storage tank 7 includes a tank body 71, an exhaust pipe 72, a first solenoid valve 73, an intake pipe 74, and a second solenoid valve 75. The tank body 71 is fixed inside the handle 12 by bolts, and the exhaust pipe 72 is fixed to the upper end of the tank body 71 by a connector. The first solenoid valve 73 is fixed to the middle of the exhaust pipe 72. The end of the exhaust pipe 72 away from the tank body 71 is located between the mounting bracket 41 and the baffle 46. The intake pipe 74 is fixed to the outer side of the tank body 71 by a connector, and the second solenoid valve 75 is fixed to the other end of the intake pipe 74. The second solenoid valve 75 is equipped with... It is placed on the outside of the handle 12; the inside of the tank 71 is filled with high-pressure inert gas; the first solenoid valve 73 and the second solenoid valve 75 are both electrically connected to the controller 6 via data lines; the tank 71 is made of high-strength aluminum alloy; the first solenoid valve 73 and the second solenoid valve 75 are both normally closed electromagnetic direct-acting valves. After the gas detection is completed, the controller 6 can open the first solenoid valve 73, thereby allowing the inert gas inside the tank 71 to be discharged between the mounting bracket 41 and the baffle 46, thereby cleaning the remaining gas at the gas detection sensor 43 position.

[0037] The usage method of this embodiment includes the following steps:

[0038] 1) In the preparation stage, first, high-pressure inert gas is filled into the interior of the gas storage tank 7, and the spare gas detection sensor 43 is placed inside the storage shell 10 and the cover plate 11 so that it can be used when the gas detection sensor 43 inside the gas detection mechanism 4 is damaged. Then, hold the handle 12 so that the dustproof net 2 of the outer shell 1 is in the detection position.

[0039] 2) During the detection phase, the suction mechanism 3 and the gas detection mechanism 4 are activated by the switch group 8. The suction mechanism 3 delivers external gas to the gas detection mechanism 4, which then detects the gas composition. After the gas composition is detected, the data is transmitted to the controller 6. The controller 6 processes the data and displays it on the display panel 9.

[0040] 3) Dustproof treatment: During use, the dustproof net 2 can prevent external dust from entering the gas detection mechanism 4. Secondly, through the cooperation of the suction mechanism 3, the turntable 13, the first magnet 14, the second magnet 15, the third magnet 16 and the fourth magnet 17, the dustproof net 2 can move back and forth, thereby causing the dust attached to the dustproof net 2 to fall off.

[0041] All components used in this application are standard parts, and the specific connection methods of each part adopt conventional methods such as sewing and gluing that are mature in the prior art. All structures use conventional materials in the prior art, and will not be described in detail here.

[0042] In summary, this handheld hazardous gas detection kit solves the following problems of existing hazardous gas detection kits: First, dust accumulates on the dustproof mesh, reducing air intake efficiency and affecting detection timeliness and accuracy; second, it can only detect a single type of hazardous gas, requiring multiple detectors of different types to detect multiple hazardous gas components; third, the gas detection sensor is fixedly installed, making replacement difficult; and finally, existing detection kits cannot clean residual gas in the detection area after a gas detection is completed.

[0043] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A handheld hazardous gas detection kit, comprising a shell (1), a dustproof net (2), a suction mechanism (3), a gas detection mechanism (4), a battery (5), a controller (6), a gas storage tank (7), a switch assembly (8), a display panel (9), a storage shell (10), a cover plate (11), and a handle (12), characterized in that: A dustproof net (2) is slidably installed at one end of the outer shell (1), wherein a suction mechanism (3) is provided on one side of the dustproof net (2), and the suction mechanism (3) is fixed inside the outer shell (1); a gas detection mechanism (4) is fixed to the end of the outer shell (1) away from the dustproof net (2) by thread engagement, and the detection end of the gas detection mechanism (4) is located inside the outer shell (1); a handle (12) is fixed to the outer side of the outer shell (1), wherein a battery (5), a controller (6) and a gas tank (7) are fixed inside the handle (12). The output end of the gas tank (7) is located inside the outer shell (1); a switch group (8) is fixed on the outer side of the handle (12), wherein the switch group (8) is electrically connected to the controller (6) via a data line, and the controller (6) is electrically connected to the suction mechanism (3), the gas detection mechanism (4), the battery (5), the gas tank (7) and the display panel (9) via data lines respectively; a display panel (9) and a storage shell (10) are fixed on the outer side of the outer shell (1), wherein a cover plate (11) is fastened to the outer side of the storage shell (10).

2. The handheld hazardous gas detection kit as described in claim 1, characterized in that: The suction mechanism (3) includes a micro servo motor (31), a transmission column (32), a positioning frame (33), and a fan body (34). The micro servo motor (31) is fixed inside the outer shell (1), wherein the output end of the micro servo motor (31) is rotatably connected to the outer shell (1), and the output end of the micro servo motor (31) is connected to the transmission column (32) through two bevel gears meshing. The transmission column (32) is rotatably connected to the positioning frame (33), wherein the positioning frame (33) is fixed to the inner wall of the outer shell (1). One end of the transmission column (32) is fixed with a fan body (34), wherein the fan body (34) is movably arranged inside the outer shell (1). The micro servo motor (31) is electrically connected to the controller (6) through a data cable.

3. The handheld hazardous gas detection kit as described in claim 2, characterized in that: A turntable (13) is fixed at the end of the transmission column (32) away from the fan body (34). The turntable (13) is set on one side of the dustproof net (2), and the outer edge of the turntable (13) is rotatably connected to the inner wall of the outer shell (1). A first magnet (14) and a second magnet (15) are fixed on the side of the turntable (13) near the dustproof net (2), respectively. The polarities of the first magnet (14) and the second magnet (15) are opposite. A third magnet (16) and a fourth magnet (17) are fixed on the side of the dustproof net (2) near the turntable (13), respectively. The polarities of the third magnet (16) and the fourth magnet (17) are opposite. The polarities of the first magnet (14) and the third magnet (16) are the same, and the polarities of the second magnet (15) and the fourth magnet (17) are the same.

4. The handheld hazardous gas detection kit as described in claim 1, characterized in that: The gas detection mechanism (4) includes a mounting bracket (41), a fixing bracket (42), a gas detection sensor (43), a rotating hole (44), a rotating column (45), a baffle (46), and a vent (47). The mounting bracket (41) is fixed inside the outer shell (1) by threaded engagement, and the fixing bracket (42) is fixed to the side of the mounting bracket (41) near the suction mechanism (3). Several different types of gas detection sensors (43) are evenly embedded on the side of the fixing bracket (42) away from the mounting bracket (41), and fixed... The side of the frame (42) away from the mounting frame (41) is fitted with the baffle (46); the baffle (46) is rotatably connected to the inner wall of the outer shell (1), and a vent hole (47) is provided through the inside of the baffle (46), the diameter of which is smaller than the size of the gas detection sensor (43); a rotating column (45) is fixed on the side of the baffle (46), wherein the rotating column (45) is rotatably installed inside the rotating hole (44), which is opened through the middle of the mounting frame (41) and the fixed frame (42).

5. A handheld hazardous gas detection kit as described in claim 4, characterized in that: The mounting bracket (41) is printed with scale lines corresponding to the position of the gas detection sensor (43), and the rotating column (44) is printed with scale lines corresponding to the position of the vent (47).

6. A handheld hazardous gas detection kit as described in claim 4, characterized in that: The fixing frame (42) includes a frame body (421), a slot (422), a sixth magnet (423), a first power contact (424), and a sealing gasket (425). The frame body (421) is fixed to the side of the mounting frame (41), and a plurality of slots (422) are provided on the side of the frame body (421) away from the mounting frame (41). The sixth magnet (423) and the first power contact (424) are fixed inside each slot (422), and the first power contact (424) is electrically connected to the controller (6) through a data cable. The sealing gasket (425) is fixed on the side of the frame body (421) near the baffle (46), and a rotating hole (44) is provided through the middle of the frame body (421). The gas detection sensor (43) includes a sensor body (431), a seventh magnet (432), a second energized contact (433), and a pick-and-place slot (434). The seventh magnet (432) and the second energized contact (433) are fixed on the side of the sensor body (431), respectively. The positions of the seventh magnet (432) and the second energized contact (433) correspond to the positions of the corresponding sixth magnet (423) and the first energized contact (424), respectively. The second energized contact (433) is electrically connected to the sensor body (431). The pick-and-place slot (434) is provided at the edge of the sensor body (431).

7. A handheld hazardous gas detection kit as described in claim 1, characterized in that: The gas storage tank (7) includes a tank body (71), an exhaust pipe (72), a first solenoid valve (73), an air inlet pipe (74), and a second solenoid valve (75). The tank body (71) is fixed inside the handle (12), and the exhaust pipe (72) is fixed at the upper end of the tank body (71). The first solenoid valve (73) is fixed in the middle of the exhaust pipe (72). The end of the exhaust pipe (72) away from the tank body (71) is located between the mounting bracket (41) and the baffle (46). The air inlet pipe (74) is fixed on the outer side of the tank body (71), and the second solenoid valve (75) is fixed at the other end of the air inlet pipe (74). The second solenoid valve (75) is located on the outside of the handle (12). The tank body (71) is filled with high-pressure inert gas. The first solenoid valve (73) and the second solenoid valve (75) are both electrically connected to the controller (6) via data lines.

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