Mobile intelligent gas detector

Abstract

The invention discloses a mobile intelligent gas detector, and relates to the technical field of gas detection. The device comprises a shell, a pan-tilt camera module, an active air supply and centrifugal dust removal detection module and a multi-mode alarm device. External gas enters the separation cylinder through the gas guide cover and the tangential gas inlet channel, dust is settled under centrifugal force, and clean gas is driven by the gas wheel paddle to wash a carbon monoxide sensor, a hydrogen sulfide sensor, an oxygen sensor and a methane sensor in the gas detection pipe, so that high-speed and low-drift detection is realized. The holder intelligently distributes driving torque in an alarm or inspection mode through a friction and electromagnetic switching mechanism, and the camera is driven to view by 360 degrees and synchronously give an acousto-optic alarm. Active sensitization, dust removal protection and panoramic monitoring are integrated, and the hazardous gas early warning and on-site emergency disposal efficiency can be remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection, and particularly to a mobile intelligent gas detector. Background Art

[0002] Most of the current mobile gas detectors have a "passive sampling" structure: relying on natural diffusion in the environment or external pumps to adsorb a small amount of sample gas into a single detection chamber, and then using electrochemical or infrared sensing elements to complete the analysis. Its defects are mainly reflected in: the path of the gas entering the detection chamber is short and the flow rate is random, resulting in response lag and amplification of instantaneous concentration fluctuations, and it is impossible to lock the dangerous peak value in a short time; there is a lack of an active separation mechanism, and dust and oil mist entrained in the air are easily deposited on the sensor membrane surface, causing zero drift and sensitivity attenuation; the instrument usually only provides a fixed-angle screen display, and it is impossible to visualize and obtain evidence for dangerous spaces; the alarm information is not deeply integrated with video, positioning and other information, and it is difficult for on-site commanders to obtain multi-modal evidence in a timely manner, affecting the efficiency of emergency disposal. Summary of the Invention

[0003] To overcome the defects of the above-mentioned prior art, the present invention provides the following technical solutions: A mobile intelligent gas detector, including a base, on which an outer shell is fixedly installed. A cloud platform is rotatably installed on the top of the outer shell, and a camera is fixedly installed on the cloud platform. A display screen is fixedly installed on the circumferential surface of the outer shell, and an air inlet is also provided on the circumferential surface of the outer shell. A gas guide cover is fixedly installed on the inner wall of the outer shell at the position of the air inlet. The inside of the gas guide cover is communicated with the outside of the outer shell through the air inlet. A collection shell and a separation cylinder are arranged at the axial position of the outer shell. The collection shell and the separation cylinder are fixedly connected and communicated, and the collection shell is fixedly installed on the base; wherein a driving part is arranged inside the cloud platform, and the driving part is used to drive the cloud platform to rotate on the outer shell; a gas detection tube is arranged at the axial center position of the collection shell and the separation cylinder. An air wheel blade is rotatably installed inside the gas detection tube, and four gas detection sensors for detecting carbon monoxide, hydrogen sulfide, oxygen and methane respectively are fixedly installed on the inner wall of the gas detection tube. A separation opening is provided at the circumferential position of the top of the gas detection tube. The air wheel blade is used to drive the gas to move towards the gas detection sensors.

[0004] Preferably, an air inlet channel is fixedly connected and communicated at the tangential position of the circumferential surface of the separation cylinder, and the air inlet channel is communicated with the inside of the gas guide cover for guiding the gas outside the outer shell into the separation cylinder.

[0005] Preferably, a plurality of exhaust channels are provided in the radial direction of the inner wall of the base, and all the exhaust channels are communicated with the bottom of the gas detection tube for discharging the gas inhaled into the separation cylinder through the separation opening, the gas detection tube and the exhaust channels.

[0006] Preferably, a rotating disk bracket is fixedly installed on the top of the inner part of the shell, and a rotating disk and a gear ring are rotatably installed on the rotating disk bracket, wherein the rotating disk and the gear ring are coaxially fixedly matched, and the circumferential surfaces of the rotating disk and the gear ring are arranged flush; a planetary gear mounting disk is rotatably matched at the center position of the rotating disk, three switching planetary gears are rotatably installed at the edge position of the planetary gear mounting disk, and a center gear is rotatably matched at the center position of the planetary gear mounting disk, and the center gear and the gear ring are meshed and transmitted through switching planetary gears.

[0007] Preferably, a switching shaft is fixedly installed at the axis center of the planetary gear mounting plate, and a toggle gear is coaxially fixed above the center gear through a shaft sleeve, and the center gear, the shaft sleeve and the toggle gear are all rotatably sleeved on the circumferential surface of the switching shaft; a sealing rubber ring is used to rotationally seal the gimbal and the top of the outer shell, and there is a rotational friction resistance between the outer shell and the gimbal through the sealing rubber ring; the shaft sleeve passes through the top of the outer shell to the inside of the gimbal.

[0008] Preferably, a driving motor and a resistance motor are fixedly mounted on the inner wall of the gimbal, wherein an input planetary gear is fixedly mounted on the output shaft of the driving motor, wherein the toggle gear is rotationally mounted at the center position of the top of the outer shell, and the input planetary gear meshes with the toggle gear for transmission.

[0009] Preferably, a friction limiting plate is fixedly mounted on the inner wall of the gimbal, an electromagnet bow bracket is fixedly mounted on the friction limiting plate, and an electromagnet is fixedly mounted on the electromagnet bow bracket, wherein a switching shaft passes through the friction limiting plate, the electromagnet bow bracket and the electromagnet to the interior of the gimbal, so that the switching shaft rotates in coordination with the friction limiting plate, the electromagnet bow bracket and the electromagnet.

[0010] Preferably, the upper surface of the friction limiting plate is frictionally overlapped with a friction disc that cooperates with the magnetic force of the electromagnet, and the friction disc is sleeved on the circumferential surface of the switching shaft in a spline sliding manner. An extrusion spring is rotatably arranged between the opposite surfaces of the electromagnet arch bracket and the friction disc, and the extrusion spring is arranged around the switching shaft. Both ends of the extrusion spring are rotatably matched with the electromagnet arch bracket and the friction disc, so that the extrusion spring provides the friction disc with an extrusion force toward the friction limiting plate, and the rotation of the switching shaft is limited by the friction force between the friction disc and the friction limiting plate.

[0011] Preferably, the top end of the switching shaft is fixedly matched with the rotating shaft of the resistance motor; a connecting rotating shaft is fixedly installed at the axial position of the rotating disk, the connecting rotating shaft extends to the interior of the gas detection tube, and the connecting rotating shaft is fixedly matched with the turbine blades through a linkage rotating shaft; a plurality of warning lights are also fixedly installed on the circumferential surface of the outer shell.

[0012] The present invention has the following beneficial effects compared with the prior art: (1) The present invention utilizes a built-in air supply system composed of a rotating disk and air turbine blades to continuously introduce external sample gas tangentially into the separation cylinder along the tangential direction, and then spray it into the detection tube at high speed through the separation port. By means of active air flow scouring, the gas intake volume of the sensor per unit time is significantly increased, the response time is shortened, and the concentration dilution or accumulation error caused by natural convection is effectively suppressed, revealing the danger threshold several times earlier than the traditional passive diffusion type; (2) The tangential air intake of the present invention forms a strong centrifugal field with the rotating cylinder wall, and particles with a larger density are thrown towards the wall surface and settle into the collection shell within the first rotation, and no longer enter the detection cavity. This arrangement reduces the dust load, keeps the sensing membrane surface clean for a long time, extends the calibration period, reduces manual maintenance, and significantly reduces the interruption rate; (3) The top pan-tilt of the present invention is coupled with the camera through a driving and resistance dual-motor and planetary gear switching mechanism, and can automatically cruise in different directions before and after an alarm to capture the on-site picture in real time. A single device can complete the integrated monitoring of 360° environmental gas and video; (4) The instrument of the present invention integrates four high-precision sensors for carbon monoxide, hydrogen sulfide, oxygen, and methane, an omnidirectional warning light, and a buzzer. When any index exceeds the standard, an audible and visual alarm is triggered and the camera is linked to align with the direction of the leakage source, which significantly improves the intuitive perception of the personnel on the dangerous position and concentration level compared with the traditional single light prompt, and shortens the evacuation and risk elimination decision-making time. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 FIG. is a schematic diagram of the overall structure of the present invention.

[0014] Figure 2 FIG. is a schematic diagram of the structure at the air inlet of the present invention.

[0015] Figure 3 FIG. is a schematic diagram of the internal structure of the outer shell of the present invention.

[0016] Figure 4 FIG. is a schematic diagram of the structure at the gas detection sensor of the present invention.

[0017] Figure 5 FIG. is a schematic diagram of the structure at the shaft sleeve of the present invention.

[0018] In the figure: 101-base; 102-exhaust channel; 103-gas detection tube; 104-turbine blade; 105-gas detection sensor; 106-linked shaft; 107-separation port; 108-connecting shaft; 109-rotating disk; 110-housing; 111-collecting shell; 112-separation cylinder; 113-rotating disk bracket; 114-gear ring; 115-planetary gear mounting disk; 116-central gear; 117-shaft sleeve; 11 8-shift gear; 119-input planetary gear; 120-friction limiting plate; 121-drive motor; 122-electromagnet; 123-electromagnet bow bracket; 124-extrusion spring; 125-friction disc; 126-switching shaft; 127-resistance motor; 128-camera; 129-pan head; 130-intake duct; 131-air guide hood; 132-air inlet; 133-warning light; 134-display screen; 135-switch planetary gear. DETAILED DESCRIPTION

[0019] The following is combined with Figures 1 - 5 , and further illustrate the technical solution of the present invention through specific implementation methods.

[0020] The present invention provides a mobile intelligent gas detector, which includes a base 101. A housing 110 is fixedly installed on the base 101. A pan-tilt 129 is rotatably installed at the top of the housing 110. A camera 128 is fixedly installed on the pan-tilt 129. A display screen 134 is fixedly installed on the circumferential surface of the housing 110. An air inlet 132 is further provided on the circumferential surface of the housing 110. A gas guide cover 131 is fixedly installed on the inner wall of the housing 110 at the position of the air inlet 132. The inside of the gas guide cover 131 is communicated with the outside of the housing 110 through the air inlet 132. A collection shell 111 and a separation cylinder 112 are arranged at the axial position of the housing 110. The collection shell 111 and the separation cylinder 112 are fixedly connected and arranged, and the collection shell 111 is fixedly installed on the base 101. Among them, a driving part is arranged inside the pan-tilt 129, and the driving part is used to drive the pan-tilt 129 to rotate on the housing 110. A gas detection tube 103 is arranged at the axial center position of the collection shell 111 and the separation cylinder 112. An air wheel blade 104 is rotatably installed inside the gas detection tube 103. Four gas detection sensors 105 for detecting carbon monoxide, hydrogen sulfide, oxygen and methane respectively are also fixedly installed on the inner wall of the gas detection tube 103. A separation opening 107 is formed at the circumferential position at the top of the gas detection tube 103. Among them, the air wheel blade 104 is used to drive the gas to move towards the gas detection sensor 105. An air inlet channel 130 is fixedly connected at the tangential position of the circumferential surface of the separation cylinder 112. The air inlet channel 130 is communicated with the inside of the gas guide cover 131, and is used to guide the gas outside the housing 110 into the inside of the separation cylinder 112. A plurality of exhaust channels 102 are formed in the radial direction of the inner wall of the base 101. All the exhaust channels 102 are communicated with the bottom of the gas detection tube 103, and are used to discharge the gas inhaled into the inside of the separation cylinder 112 through the separation opening 107, the gas detection tube 103 and the exhaust channels 102.

[0021] A rotating disk bracket 113 is fixedly installed on the top of the inner part of the shell 110, and a rotating disk 109 and a gear ring 114 are rotatably installed on the rotating disk bracket 113, wherein the rotating disk 109 and the gear ring 114 are coaxially fixedly matched, and the circumferential surfaces of the rotating disk 109 and the gear ring 114 are arranged flush; a planetary gear mounting disk 115 is rotatably mounted at the center position of the rotating disk 109, and three switching planetary gears 135 are rotatably mounted at the edge position of the planetary gear mounting disk 115, and a central gear 116 is rotatably mounted at the center position of the planetary gear mounting disk 115, and the central gear 116 and the gear ring 114 are meshed and transmitted through the switching planetary gears 135. A switching shaft 126 is fixedly installed at the axis center of the planetary gear mounting plate 115, and a toggle gear 118 is coaxially fixed above the central gear 116 through a shaft sleeve 117. The central gear 116, the shaft sleeve 117 and the toggle gear 118 are all rotatably sleeved on the circumferential surface of the switching shaft 126; a sealing rubber ring is used to rotationally seal the gimbal 129 and the top of the outer shell 110, and there is a rotational friction resistance between the outer shell 110 and the gimbal 129 through the sealing rubber ring; the shaft sleeve 117 passes through the top of the outer shell 110 to the inside of the gimbal 129.

[0022] A driving motor 121 and a resistance motor 127 are fixedly mounted on the inner wall of the pan-tilt 129, wherein an input planetary gear 119 is fixedly mounted on the output shaft of the driving motor 121, wherein a toggle gear 118 is rotationally mounted at the center of the top of the housing 110, and the input planetary gear 119 is meshed with the toggle gear 118 for transmission. A friction limiting plate 120 is also fixedly mounted on the inner wall of the pan-tilt 129, an electromagnet bow bracket 123 is fixedly mounted on the friction limiting plate 120, and an electromagnet 122 is fixedly mounted on the electromagnet bow bracket 123, wherein a switching shaft 126 penetrates the friction limiting plate 120, the electromagnet bow bracket 123 and the electromagnet 122 to the interior of the pan-tilt 129, so that the switching shaft 126 is rotationally matched with the friction limiting plate 120, the electromagnet bow bracket 123 and the electromagnet 122.

[0023] The upper surface of the friction limiting plate 120 is frictionally overlapped with a friction disc 125 that is magnetically matched with the electromagnet 122. The friction disc 125 is sleeved on the circumferential surface of the switching shaft 126 in a spline sliding manner. A compression spring 124 is rotatably arranged between the opposite surfaces of the electromagnet arch bracket 123 and the friction disc 125. The compression spring 124 is arranged around the switching shaft 126. Both ends of the compression spring 124 are rotationally matched with the electromagnet arch bracket 123 and the friction disc 125, so that the compression spring 124 provides the friction disc 125 with a compression force toward the friction limiting plate 120, and the rotation of the switching shaft 126 is limited by the friction between the friction disc 125 and the friction limiting plate 120.

[0024] The top end of the switching shaft 126 is fixedly matched with the rotating shaft of the resistance motor 127; a connecting shaft 108 is fixedly installed at the axial position of the rotating disk 109, the connecting shaft 108 extends to the interior of the gas detection tube 103, and the connecting shaft 108 is fixedly matched with the turbine blade 104 through the linkage shaft 106; a plurality of warning lights 133 are also fixedly installed on the circumferential surface of the outer shell 110.

[0025] The working principle of a mobile intelligent gas detector disclosed in the present invention is as follows: start the drive motor 121, the output shaft of the drive motor 121 drives the input planetary gear 119 to rotate, the rotation of the input planetary gear 119 drives the toggle gear 118 to rotate, the rotation of the toggle gear 118 drives the shaft sleeve 117 to rotate, the rotation of the shaft sleeve 117 drives the central gear 116 to rotate, the rotation of the central gear 116 drives the gear ring 114 to rotate through the switching planetary gear 135, at this time, the friction plate 125 limits the rotation of the switching shaft 126 through the friction force between the friction limiting plate 120 (the friction plate 125 and the switching shaft 126 are splined and slidingly matched), which will cause the planetary gear mounting plate 115 fixed to the switching shaft 126 to be unable to rotate, so the switching planetary gear 135 cannot revolve, and at this time all the power will be transmitted to the gear ring 114 through the central gear 116 (friction resistance is not calculated), and the rotation of the gear ring 114 will drive the rotating disk 109 to rotate, and the rotating disk 109 will rotate. The turntable 109 drives the turbine blades 104 to rotate by connecting the rotating shaft 108 and the linkage rotating shaft 106. The turbine blades 104 will drive the gas inside the gas detection tube 103 to flow from top to bottom, and discharge the gas inside the separation port 107 into the exhaust channel 102, and then be discharged through the exhaust channel 102. In this process, the gas inside the separation cylinder 112 will enter the gas detection tube 103 through the separation port 107, and the gas inside the air guide cover 131 will enter the separation cylinder 112 along the tangential direction of the inner wall of the separation cylinder 112 through the air inlet 130, and the external gas will enter the air guide cover 131 through the air inlet 132. Finally, the external gas is driven by the turbine blades 104 to contact the gas detection sensor 105 (the detection gas range of the four gas detection sensors 105 is: carbon monoxide 0-1000ppm; hydrogen sulfide 0-100ppm; oxygen 0-30%vol; methane 0-100%LEL). Compared with the traditional passive gas detection method, this method can actively allow the gas to contact the gas detection sensor 105, so as to detect whether the gas concentration exceeds the standard earlier.

[0026] After the device is powered on and working properly, carry the device into the construction operation area. Place the device on a flat area and manually rotate the pan-tilt 129 so that the camera 128 is aligned with the area to be monitored and the monitoring image is clear. At the same time, the exhaust channel 102 can also be fixed on a tripod for use (when there is no installation position on the site). When the device detects that the ambient gas exceeds the safety threshold, the warning light 133 stays on constantly and the buzzer emits a warning sound (a buzzer is also installed on the housing 110).

[0027] When no one is around, the pan / tilt 129 can also drive the camera 128 to rotate actively to observe the field of view in different directions. Specifically, the electromagnet 122 needs to be started, and the electromagnet 122 generates magnetic force to attract the friction disk 125, so that the friction disk 125 moves toward the electromagnet 122, and the extrusion spring 124 is in a compressed state. At this time, the friction between the friction limiting plate 120 and the friction disk 125 disappears, and the switching shaft 126 is no longer restricted by the friction between the friction disk 125 and the friction limiting plate 120. At this time, the central gear 116 drives the gear ring 114 to rotate by switching the planetary gear 135. Part of the power will be transmitted to the planetary gear mounting plate 115, and then the switching shaft 126 will rotate, and the planetary gear 135 will be switched at the same time. The switching shaft 126 will rotate in an orbit (the switching shaft 126 will drive the rotating shaft of the resistance motor 127 to move. The resistance motor 127 is a rotating accessory. Here, the rotor rotating shaft of the resistance motor 127 mainly provides resistance to the rotation of the switching shaft 126, because the resistance motor 127 rotor has resistance when rotating; it is used to distribute part of the power to the gear ring 114. Otherwise, if the switching shaft 126 is in a completely free rotation, this will cause the power input to the planetary gear 119 to be fully transmitted to the switching shaft 126, because the resistance to driving the air turbine blades 104 to rotate is greater than the resistance to driving the switching shaft 126 to rotate (the transmission friction is not considered). At this time, the output rotation of the driving motor 121 drives the input planetary gear 119 to rotate, and the input planetary gear 119 will revolve around the toggle gear 118. This is because there is a relative rotation between the switching shaft 126 and the pan / tilt head 129. When the electromagnet 122 is not started, that is, there is friction between the friction disk 125 and the friction limiting plate 120, the switching shaft 126 and the pan / tilt head 129 are equivalent to a fixed state, that is, the driving motor 121 and the switching shaft 126 are both fixed on the pan / tilt head 129 (the fixing of the switching shaft 126 and the pan / tilt head 129 means that there is no relative rotation). Similarly, The switching planetary gear 135 on the planetary gear mounting plate 115 is equivalent to being rotatably mounted on the pan-tilt head 129. The output shaft of the driving motor 121 drives the turbine blades 104 to rotate through the input planetary gear 119, the shifting gear 118, the shaft sleeve 117, the central gear 116, the switching planetary gear 135, the gear ring 114, the rotating plate 109, the connecting shaft 108, and the linkage shaft 106 in sequence (when the turbine blades 104 rotate, the force of the air reaction on the turbine blades 104 is offset by the rotational friction between the housing 110 and the pan-tilt head 129, so the pan-tilt head 129 cannot be driven to rotate);When the switching shaft 126 rotates relative to the gimbal 129, that is, the switching planetary gear 135 and the gimbal 129 have a relative motion relationship (revolution), the torque applied to the gimbal 129 by the output shaft of the drive motor 121 (the input planetary gear 119 revolves around the toggle gear 118) and the switching shaft 126 cannot be offset. At this time, the output shaft of the drive motor 121 drives the input planetary gear 119, the toggle gear 118, the shaft sleeve 117, the central gear 116, the switching planetary gear 135, the gear ring 114, the rotating disk 109, the connecting shaft 108, the linkage shaft 106, and the turbine blades 104 to rotate, which requires resistance (where the turbine blades 104 and the air The resistance between them is ignored here, mainly the mechanical friction transmission resistance), and the reaction force of the resistance is applied to the drive motor 121, which will cause the output shaft of the drive motor 121 to drive the input planetary gear 119 to revolve on the toggle gear 118 (the rotational friction resistance of the pan-tilt 129 and the housing 110 is less than the transmission resistance on the path of the input planetary gear 119, the toggle gear 118, the shaft sleeve 117, the central gear 116, the switching planetary gear 135, the gear ring 114, the rotating disk 109, the connecting shaft 108, the linkage shaft 106, and the air turbine blade 104), so that the pan-tilt 129 rotates on the top of the housing 110, thereby changing the illumination angle of the camera 128. ;

[0028] If there are floating particles (dust) in the ambient gas, when the gas enters the separation cylinder 112 along the tangent of the inner wall of the separation cylinder 112, the gas will rotate with the gas. During the rotation, the particles will be separated from the gas under the action of centrifugal force. The lighter gas will enter the gas detection tube 103 through the separation port 107, while the larger particle dust will rotate along the inner wall of the separation cylinder 112 and then fall into the collection shell 111 under the action of gravity, so that the dust is separated from the gas to be tested, reducing the impact of dust on the gas detection sensor 105.

Claims

1. A mobile intelligent gas detector, characterized in that: It includes a base (101), on which a housing (110) is fixedly installed. A pan-tilt (129) is rotatably installed at the top of the housing (110), and a camera (128) is fixedly installed on the pan-tilt (129). A display screen (134) is fixedly installed on the circumferential surface of the housing (110). An air inlet (132) is also provided on the circumferential surface of the housing (110). An air guide cover (131) is fixedly installed at the position of the inner wall of the housing (110) corresponding to the air inlet (132). The interior of the air guide cover (131) is communicated with the exterior of the housing (110) through the air inlet (132). A collection shell (111) and a separation cylinder (112) are arranged at the axial position of the housing (110). The collection shell (111) and the separation cylinder (112) are fixedly and communicatively arranged, and the collection shell (111) is fixedly installed on the base (101). Among them, a driving part is arranged inside the pan-tilt (129), and the driving part is used to drive the pan-tilt (129) to rotate on the housing (110). A gas detection tube (103) is arranged at the axial center position of the collection shell (111) and the separation cylinder (112). An air turbine blade (104) is rotatably installed inside the gas detection tube (103). Four gas detection sensors (105) for detecting carbon monoxide, hydrogen sulfide, oxygen, and methane respectively are also fixedly installed on the inner wall of the gas detection tube (103). A separation opening (107) is formed at the circumferential position of the top of the gas detection tube (103). Among them, the air turbine blade (104) is used to drive the gas to move towards the gas detection sensor (105).

2. The mobile intelligent gas detector according to claim 1, wherein: An air inlet duct (130) is fixedly and communicatively arranged at the tangential position of the circumferential surface of the separation cylinder (112). The air inlet duct (130) is communicated with the interior of the air guide cover (131) and is used to guide the gas outside the housing (110) into the interior of the separation cylinder (112).

3. The mobile intelligent gas detector according to claim 2, characterized in that: A plurality of exhaust channels (102) are formed in the radial direction of the inner wall of the base (101). All the exhaust channels (102) are communicated with the bottom of the gas detection tube (103) and are used to discharge the gas inhaled into the interior of the separation cylinder (112) through the separation opening (107), the gas detection tube (103), and the exhaust channels (102).

4. The mobile intelligent gas detector according to claim 3, wherein: A rotating disk support (113) is fixedly installed at the top inside the housing (110). A rotating disk (109) and a gear ring (114) are rotatably installed on the rotating disk support (113). Among them, the rotating disk (109) and the gear ring (114) are coaxially and fixedly fitted, and the circumferential surfaces of the rotating disk (109) and the gear ring (114) are flush. A planetary gear mounting disk (115) is rotatably fitted at the center position of the rotating disk (109). Three switching planetary gears (135) are rotatably installed at the edge position of the planetary gear mounting disk (115). A central gear (116) is rotatably fitted at the center position of the planetary gear mounting disk (115). The central gear (116) and the gear ring (114) are meshed and driven through the switching planetary gears (135).

5. The mobile intelligent gas detector according to claim 4, wherein: A switching shaft (126) is fixedly installed at the axis center of the planetary gear mounting disc (115). Above the central gear (116), a shifting gear (118) is coaxially fixed through a shaft sleeve (117). The central gear (116), the shaft sleeve (117), and the shifting gear (118) are all rotatably sleeved on the circumferential surface of the switching shaft (126); a rotary seal fit is adopted between the pan-tilt (129) and the top of the outer shell (110) by means of a sealing rubber ring, and there is a rotational frictional resistance between the outer shell (110) and the pan-tilt (129) through the sealing rubber ring; wherein the shaft sleeve (117) penetrates through the top of the outer shell (110) to the inside of the pan-tilt (129).

6. The mobile intelligent gas detector according to claim 5, characterized in that: A driving motor (121) and a resistance motor (127) are fixedly installed on the inner wall of the pan-tilt (129). An input planetary gear (119) is fixedly installed on the output shaft of the driving motor (121). The shifting gear (118) is rotatably fitted at the center position of the top of the outer shell (110), and the input planetary gear (119) is in meshing transmission with the shifting gear (118).

7. The mobile intelligent gas detector according to claim 6, characterized in that: A friction limiting plate (120) is also fixedly installed on the inner wall of the pan-tilt (129). An electromagnet bow-shaped bracket (123) is fixedly installed on the friction limiting plate (120). An electromagnet (122) is fixedly installed on the electromagnet bow-shaped bracket (123). The switching shaft (126) penetrates through the friction limiting plate (120), the electromagnet bow-shaped bracket (123), and the electromagnet (122) to the inside of the pan-tilt (129), so that the switching shaft (126) is rotatably fitted with the friction limiting plate (120), the electromagnet bow-shaped bracket (123), and the electromagnet (122).

8. The mobile intelligent gas detector according to claim 7, wherein: A friction disc (125) magnetically matched with the electromagnet (122) is frictionally lapped on the upper surface of the friction limiting plate (120). The friction disc (125) is sleeved on the circumferential surface of the switching shaft (126) in a spline sliding manner. A compression spring (124) is rotatably arranged between the opposite surfaces of the electromagnet bow-shaped bracket (123) and the friction disc (125), and the compression spring (124) is arranged around the switching shaft (126).

9. The mobile intelligent gas detector according to claim 8, characterized in that: The top end of the switching shaft (126) is fixedly fitted with the rotating shaft of the resistance motor (127); a connecting rotating shaft (108) is fixedly installed at the axis center of the rotating disc (109). The connecting rotating shaft (108) extends into the inside of the gas detection tube (103), and the connecting rotating shaft (108) is fixedly fitted with the gas turbine blade (104) through a linkage rotating shaft (106); a plurality of warning lights (133) are also fixedly installed on the circumferential surface of the outer shell (110).

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