A safety helmet for fire investigators with an alarm function

Abstract

The present invention provides a safety helmet for fire investigators with an alarm function, which relates to the field of safety helmets. The safety helmet for fire investigators with an alarm function comprises a helmet, wherein the helmet is provided with a brim, and side ears are provided on both sides of the helmet, and a protective mask is installed and connected between the two side ears. The safety helmet for fire investigators with an alarm function provided by the present invention drives the drive shaft to rotate through the output end of the motor, drives the piston to move at the upper end of the vertical cylinder, so that the outside air flows into the interior of the vertical cylinder, and realizes the harmful gas detector inside the vertical cylinder to detect the harmful gases in the air in real time; the alarm and the two warning lights are controlled to work automatically by the controller, and the electromagnet is energized at the same time, so that the two magnetic blocks drive the two slide bars to slide, and the two warning lights then extend out of the outside of the top horizontal shell, thereby realizing automatic alarm to remind investigators to pay attention to the hazards of the air environment.

Description

Technical Field

[0001] The present invention relates to the field of safety helmets, in particular to a safety helmet with an alarm function for fire investigators. Background Art

[0002] Fire refers to a disaster caused by uncontrolled combustion in time or space. Among various disasters, fire is one of the most frequent and widespread threats to public safety and social development. Fire investigators must wear protective gear to protect themselves while fighting fires, often including helmets for head protection.

[0003] Existing safety helmets, when worn, can prevent injuries caused by impact and burns from high temperatures of flames to a certain extent. However, the fire scene environment is relatively complex. The air environment contains not only some ashes produced by burning, but also some harmful gases. Investigators cannot sense the conditions of the air environment in time during the rescue process. If they inhale harmful gases, they will become poisoned, which will directly endanger the lives of investigators.

[0004] Therefore, it is necessary to provide a new fire investigator safety helmet with an alarm function to solve the above-mentioned technical problems. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a safety helmet for fire investigators with an alarm function.

[0006] The present invention provides a safety helmet for fire investigators with an alarm function, comprising: a helmet, the helmet being provided with a brim, side ears being provided on both sides of the helmet, a protective mask being installed and connected between the two side ears, two elastic bands being provided at the lower end of the helmet, one end of one elastic band being provided with a snap buckle, and one end of the other elastic band being provided with a snap shell, a lighting lamp being installed and connected to the helmet, a first mounting slot being provided on the inner wall of the helmet, an embedded power supply being installed and connected in the first mounting slot, a second mounting slot being provided on the inner wall of the helmet, a controller being installed and connected in the second mounting slot; an environmental detection mechanism, the environmental detection mechanism comprising a vertical cylinder, the vertical cylinder being fixedly connected to the side wall of the helmet, a horizontal plate being provided at the middle part of the vertical cylinder, a partition being provided at the upper end of the vertical cylinder, a motor being installed and connected to the partition, an exhaust assembly being provided at the upper end of the horizontal plate, a harmful gas detector being provided below the horizontal plate, the harmful gas detector being fixedly connected to the inner wall of the vertical cylinder, an opening being provided at the lower end of the vertical cylinder, and an auxiliary exhaust assembly being provided below the horizontal plate.

[0007] Preferably, the vacuum assembly includes a drive shaft, one end of the drive shaft is fixedly connected to the output end of the motor, an inner connecting bar is fixedly connected to the inner wall of the vertical cylinder, the other end of the drive shaft is rotatably connected to the inner connecting bar, a piston is provided on the drive shaft, the side wall of the piston is abutted against the inner wall of the vertical cylinder, a threaded opening is provided in the middle of the piston, the drive shaft is a threaded rod, the piston is threadedly connected to the drive shaft, and two small circular openings are symmetrically provided on the horizontal plate, and an air intake valve is installed and connected in the two small circular openings.

[0008] Preferably, the auxiliary discharge assembly includes an outer branch pipe, one end of the outer branch pipe is connected to the upper side wall of the vertical cylinder, the other end of the outer branch pipe extends to the lower end of the vertical cylinder, an annular blowing shell is installed and connected on the inner wall of the lower end of the vertical cylinder, the other end of the outer branch pipe is connected to the annular blowing shell, a plurality of blowing ports are arranged in a ring on the annular blowing shell, and an exhaust valve is installed and connected on the pipe wall of the outer branch pipe.

[0009] Preferably, a filter frame is installed and connected at the opening, filter ports are provided at both ends of the filter frame, and filter screens are installed and connected at both filter ports.

[0010] Preferably, an auxiliary cleaning mechanism is provided at the opening, and the auxiliary cleaning mechanism includes a thin shaft, the upper end of the thin shaft is fixedly connected to the lower end of the driving shaft, the thin shaft is rotatably connected to the horizontal plate, the lower end of the thin shaft is fixedly connected to the main gear, and the lower end outer wall of the vertical cylinder is fixedly connected to a base frame, and two cleaning brush assemblies are symmetrically provided on the base frame.

[0011] Preferably, the cleaning brush assembly includes a short shaft, one end of the short shaft is rotatably connected to the base frame, a moving block is provided on the short shaft, a cleaning plate is fixedly connected to the moving block, a threaded opening is provided on the moving block, the short shaft is a reciprocating screw, the moving block is threadedly connected to the short shaft, and the other end of the short shaft is fixedly connected to a sub-gear, which is engaged with the main gear.

[0012] Preferably, a top transverse shell is provided at the upper end of the helmet, an automatic alarm mechanism is provided inside the top transverse shell, the automatic alarm mechanism includes a siren, the siren is fixedly installed in the middle of the top transverse shell, an electromagnet is fixedly connected to the inner wall of the middle part of the top transverse shell, both ends of the top transverse shell are fixedly connected with embedded blocks, both end walls of the top transverse shell are provided with small openings, and both ends of the top transverse shell are provided with ejection warning components.

[0013] Preferably, the ejection warning assembly includes a sliding rod, which is slidably connected to the embedded block, one end of the sliding rod is fixedly connected to a magnetic block, the magnetic block has the same magnetic pole as the electromagnet, a spring is sleeved on the sliding rod, one end of the spring is connected to the magnetic block, and the other end of the spring is connected to the embedded block, one end of the sliding rod is installed and connected to a warning light, the other end of the sliding rod is fixedly connected to a protective plate, a small contact block is provided on the magnetic block, and a contact strip is provided on the inner wall of the top transverse shell.

[0014] Compared with related technologies, the fire investigator safety helmet with alarm function provided by the present invention has the following beneficial effects:

[0015] 1. The present invention provides a safety helmet for fire investigators with an alarm function. The motor output drives a drive shaft to rotate, driving a piston at the upper end of a vertical cylinder to move. When the piston moves away from the air inlet valve at the two small circular openings, outside air flows into the interior of the vertical cylinder through the opening at the lower end of the vertical cylinder. The harmful gas detector inside the vertical cylinder can detect harmful gases in the air in real time, thereby preventing investigators from being poisoned by harmful air in the fire environment.

[0016] 2. The present invention provides a safety helmet for fire investigators with an alarm function. A driving shaft drives a thin shaft to rotate, which in turn drives a main gear to rotate stably. The main gear drives two sub-gears to rotate accordingly. The two sub-gears drive two short shafts to rotate relative to two base frames. This allows two moving blocks to drive two cleaning plates to reciprocate, thereby scraping dust and impurities off two filter screens using the two cleaning plates.

[0017] 3. The present invention provides a safety helmet for fire investigators with an alarm function. When a drive shaft drives a piston to slide in the opposite direction inside a vertical cylinder and approach an air inlet valve, the piston discharges the air inside the vertical cylinder through an outer branch pipe into the interior of an annular air blowing shell. The evenly blown air automatically blows away dust swept off the two filter screens at the opening, thereby ensuring good air permeability of the two filter screens.

[0018] 4. The present invention provides a safety helmet for fire investigators with an alarm function. A controller automatically controls the alarm and two warning lights. Simultaneously, the electromagnet is energized, causing the two magnetic blocks to drive two slide bars to slide relative to the two embedded blocks. The warning lights at one end of the two slide bars then extend outside the top transverse shell, thereby automatically sounding an alarm to alert investigators to hazards in the air environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of a preferred embodiment of a safety helmet for fire investigators with an alarm function provided by the present invention;

[0020] Figure 2 for Figure 1 The structural diagram of the environmental detection mechanism shown;

[0021] Figure 3 for Figure 2 The structural diagram of A shown;

[0022] Figure 4 for Figure 2 The structural diagram of B shown;

[0023] Figure 5 for Figure 4 The structural diagram of the auxiliary cleaning mechanism shown;

[0024] Figure 6 for Figure 1 The structural diagram of the automatic alarm mechanism shown;

[0025] Figure 7 for Figure 6 Schematic diagram of the structure at C shown.

[0026] Numbers in the figure: 1. Helmet; 11. Brim; 12. Side ears; 13. Top transverse shell; 2. Protective mask; 3. Elastic belt; 31. Snap buckle; 32. Snap shell; 4. Light; 5. Embedded power supply; 51. Controller; 6. Environmental detection mechanism; 61. Vertical cylinder; 611. Horizontal plate; 612. Internal connecting strip; 613. Harmful gas detector; 62. Motor; 63. Drive shaft; 64. Piston; 65. Intake valve; 66. External branch pipe; 6 7. Annular blowing shell; 68. Exhaust valve; 7. Filter frame; 71. Filter; 8. Auxiliary cleaning mechanism; 81. Thin shaft; 82. Main gear; 83. Base; 84. Short shaft; 85. Moving block; 851. Cleaning plate; 86. Sub-gear; 9. Automatic alarm mechanism; 91. Siren; 92. Electromagnet; 93. Sliding rod; 931. Magnetic block; 932. Protective plate; 94. Spring; 95. Warning light; 96. Small contact block; 97. Contact strip. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] Please refer to Figures 1 to 7A safety helmet for fire investigators with an alarm function includes: a helmet 1, a brim 11 provided on the helmet 1, side ears 12 provided on both sides of the helmet 1, a protective mask 2 installed and connected between the two side ears 12, two elastic bands 3 provided at the lower end of the helmet 1, one end of one elastic band 3 provided with a snap buckle 31, and one end of the other elastic band 3 provided with a snap shell 32, a lighting lamp 4 installed and connected to the helmet 1, a first mounting groove provided on the inner wall of the helmet 1, an embedded power supply 5 installed and connected in the first mounting groove, and a second mounting groove provided on the inner wall of the helmet 1. A controller 51 is installed and connected in the second installation slot; the environmental detection mechanism 6 includes a vertical cylinder 61, which is fixedly connected to the side wall of the helmet 1, a horizontal plate 611 is provided in the middle of the vertical cylinder 61, a partition is provided at the upper end of the vertical cylinder 61, a motor 62 is installed and connected on the partition, an exhaust assembly is provided at the upper end of the horizontal plate 611, a harmful gas detector 613 is provided below the horizontal plate 611, the harmful gas detector 613 is fixedly connected to the inner wall of the vertical cylinder 61, an opening is provided at the lower end of the vertical cylinder 61, and an auxiliary exhaust assembly is provided below the horizontal plate 611.

[0029] In the specific implementation process, Figure 2 and Figure 3 As shown, the vacuum assembly includes a drive shaft 63, one end of which is fixedly connected to the output end of the motor 62, an inner connecting bar 612 is fixedly connected to the inner wall of the vertical cylinder 61, and the other end of the drive shaft 63 is rotatably connected to the inner connecting bar 612, a piston 64 is provided on the drive shaft 63, the side wall of the piston 64 is abutted against the inner wall of the vertical cylinder 61, a threaded opening is provided in the middle of the piston 64, the drive shaft 63 is a threaded rod, the piston 64 is threadedly connected to the drive shaft 63, and two small circular openings are symmetrically provided on the horizontal plate 611, and an air intake valve 65 is installed and connected to the two small circular openings.

[0030] It should be noted that: when the motor 62 works, its output end drives the drive shaft 63 to rotate, driving the piston 64 to move back and forth at the upper end of the vertical cylinder 61. When the piston 64 moves away from the air intake valve 65 at the two small circular openings, the outside air flows into the interior of the vertical cylinder 61 through the opening at the lower end of the vertical cylinder 61, and the harmful gas detector 613 inside the vertical cylinder 61 detects harmful gases in the air.

[0031] refer to Figure 3 and Figure 4 As shown, the auxiliary discharge assembly includes an outer branch pipe 66, one end of the outer branch pipe 66 is connected to the upper end side wall of the vertical cylinder 61, and the other end of the outer branch pipe 66 extends to the lower end of the vertical cylinder 61. An annular blowing shell 67 is installed and connected on the inner wall of the lower end of the vertical cylinder 61. The other end of the outer branch pipe 66 is connected to the annular blowing shell 67. A plurality of blowing ports are arranged in a ring on the annular blowing shell 67. An exhaust valve 68 is installed and connected on the pipe wall of the outer branch pipe 66.

[0032] It should be noted that: when the drive shaft 63 drives the piston 64 to slide in the opposite direction inside the vertical cylinder 61 and approach the air inlet valve 65, the piston 64 discharges the air inside the vertical cylinder 61 through the outer branch pipe 66, and the discharged air is discharged to the interior of the annular blowing shell 67 through the exhaust valve 68 on the outer branch pipe 66. The evenly blown air automatically blows away the dust swept off the two filter screens 71 at the opening, ensuring that the two filter screens 71 have good permeability.

[0033] refer to Figure 4 and Figure 5 As shown, a filter frame 7 is installed and connected at the opening, and filter ports are provided at both ends of the filter frame 7, and filter screens 71 are installed and connected at both filter ports.

[0034] It should be noted that the two filter screens 71 at the opening can effectively filter dust and impurities in the air.

[0035] refer to Figure 5 As shown, an auxiliary cleaning mechanism 8 is provided at the opening, and the auxiliary cleaning mechanism 8 includes a thin shaft 81, the upper end of the thin shaft 81 is fixedly connected to the lower end of the driving shaft 63, the thin shaft 81 is rotatably connected to the horizontal plate 611, the lower end of the thin shaft 81 is fixedly connected to the main gear 82, and the lower end outer wall of the vertical cylinder 61 is fixedly connected to the base frame 83, and two cleaning brush assemblies are symmetrically provided on the base frame 83; the cleaning brush assembly includes a short shaft 84, one end of the short shaft 84 is rotatably connected to the base frame 83, a moving block 85 is provided on the short shaft 84, a cleaning plate 851 is fixedly connected to the moving block 85, a threaded opening is provided on the moving block 85, the short shaft 84 is a reciprocating screw, the moving block 85 is threadedly connected to the short shaft 84, and the other end of the short shaft 84 is fixedly connected to the sub-gear 86, which meshes with the main gear 82.

[0036] It should be noted that: the rotation of the drive shaft 63 drives the thin shaft 81 to rotate accordingly, the rotation of the thin shaft 81 drives the main gear 82 to rotate stably, the main gear 82 drives the two sub-gears 86 to rotate accordingly, the two sub-gears 86 drive the two short shafts 84 to rotate stably, and the two short shafts 84 rotate relative to the two base frames 83, so that the two moving blocks 85 can drive the two cleaning plates 851 to move back and forth, and the two cleaning plates 851 scrape off the dust and impurities on the two filter screens 71.

[0037] refer to Figure 6 and Figure 7As shown, the upper end of the helmet 1 is provided with a top transverse shell 13, and the interior of the top transverse shell 13 is provided with an automatic alarm mechanism 9, which includes a siren 91, which is fixedly mounted in the middle of the top transverse shell 13, and an electromagnet 92 is fixedly connected to the inner wall of the middle of the top transverse shell 13, and both ends of the top transverse shell 13 are fixedly connected with an embedded block, and both ends of the shell wall of the top transverse shell 13 are provided with a small opening, and both ends of the top transverse shell 13 are provided with an ejection warning component; the ejection warning component includes a slide bar 9 3. The slide bar 93 is slidably connected to the embedded block. One end of the slide bar 93 is fixedly connected to a magnet 931. The magnet 931 has the same magnetic pole as the electromagnet 92. A spring 94 is sleeved on the slide bar 93. One end of the spring 94 is connected to the magnet 931, and the other end of the spring 94 is connected to the embedded block. A warning light 95 is installed and connected to one end of the slide bar 93. The other end of the slide bar 93 is fixedly connected to a protective plate 932. A small contact block 96 is provided on the magnet 931, and a contact strip 97 is provided on the inner wall of the top transverse shell 13.

[0038] It should be noted that: when the harmful gas detector 613 detects that the concentration of harmful gases in the air reaches the harmful range, the controller 51 (existing technology) controls the alarm 91 and the two warning lights 95 to automatically work;

[0039] At the same time, the electromagnet 92 is energized, and the electromagnet 92 repels the two magnetic blocks 931, causing the two magnetic blocks 931 to drive the two slide bars 93 to slide relative to the two embedded blocks. The two springs 94 are elastically deformed, and the warning lights 95 at the opposite ends of the two slide bars 93 are extended out of the top transverse shell 13, thereby realizing an automatic alarm to remind investigators to pay attention to the hazards of the air environment.

[0040] The working principle of the fire investigator safety helmet with an alarm function provided by the present invention is as follows: the motor 62 operates so that its output end drives the drive shaft 63 to rotate, driving the piston 64 to reciprocate at the upper end of the vertical cylinder 61. When the piston 64 moves away from the two small circular openings of the air inlet valve 65, the outside air flows into the interior of the vertical cylinder 61 through the opening at the lower end of the vertical cylinder 61. The two filter screens 71 at the opening can effectively filter dust and impurities in the air. The harmful gas detector 613 (existing technology) inside the vertical cylinder 61 detects harmful gases in the air.

[0041] The rotation of the drive shaft 63 drives the thin shaft 81 to rotate accordingly, and the rotation of the thin shaft 81 drives the main gear 82 to rotate stably. The main gear 82 drives the two sub-gears 86 to rotate accordingly, and the two sub-gears 86 drive the two short shafts 84 to rotate stably. The two short shafts 84 rotate relative to the two base frames 83, so that the two moving blocks 85 drive the two cleaning plates 851 to move back and forth accordingly. The two cleaning plates 851 scrape dust and impurities off the two filter screens 71;

[0042] When the drive shaft 63 drives the piston 64 to slide in the opposite direction inside the vertical cylinder 61 and approach the air inlet valve 65, the piston 64 discharges the air inside the vertical cylinder 61 through the outer branch pipe 66. The discharged air is discharged to the interior of the annular blowing shell 67 through the exhaust valve 68 on the outer branch pipe 66. The evenly blown air automatically blows away the dust swept off the two filter screens 71 at the opening, ensuring that the two filter screens 71 have good permeability, thereby ensuring a good alarm detection effect.

[0043] When the harmful gas detector 613 detects that the concentration of harmful gases in the air reaches a harmful range, the controller 51 (existing technology) controls the alarm 91 and the two warning lights 95 to work automatically, and at the same time energizes the electromagnet 92. The electromagnet 92 repels the two magnetic blocks 931, causing the two magnetic blocks 931 to drive the two slide bars 93 to slide relative to the two embedded blocks. The two springs 94 undergo elastic deformation, and the warning lights 95 at the opposite ends of the two slide bars 93 extend out of the top transverse shell 13, thereby realizing an automatic alarm to remind investigators to pay attention to the hazards of the air environment.

[0044] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A safety helmet for fire investigators with an alarm function, characterized in that: include: A helmet (1) is provided with a brim (11), side ears (12) are provided on both sides of the helmet (1), a protective mask (2) is installed and connected between the two side ears (12), two elastic bands (3) are provided at the lower end of the helmet (1), one end of one elastic band (3) is provided with a snap-on buckle (31), and one end of the other elastic band (3) is provided with a snap-on shell (32), a lighting lamp (4) is installed and connected to the helmet (1), a first mounting slot is provided on the inner wall of the helmet (1), an embedded power supply (5) is installed and connected in the first mounting slot, a second mounting slot is provided on the inner wall of the helmet (1), and a controller (51) is installed and connected in the second mounting slot; An environmental detection mechanism (6), the environmental detection mechanism (6) comprising a vertical tube (61), the vertical tube (61) being fixedly connected to the side wall of the helmet (1), a horizontal plate (611) being provided in the middle of the vertical tube (61), a partition being provided at the upper end of the vertical tube (61), a motor (62) being mounted and connected to the partition, an air extraction component being provided at the upper end of the horizontal plate (611), a harmful gas detector (613) being provided below the horizontal plate (611), the harmful gas detector (613) being fixedly connected to the inner wall of the vertical tube (61), an opening being provided at the lower end of the vertical tube (61), and an auxiliary exhaust component being provided below the horizontal plate (611); The air extraction assembly comprises a drive shaft (63), a piston (64) is provided on the drive shaft (63), the side wall of the piston (64) abuts against the inner wall of the vertical cylinder (61), and two small circular openings are symmetrically provided on the horizontal plate (611), and an air intake valve (65) is installed and connected in the two small circular openings; The auxiliary discharge assembly comprises an outer branch pipe (66), one end of which is connected to the upper side wall of the vertical cylinder (61), and the other end of which extends to the lower end of the vertical cylinder (61). An annular blowing shell (67) is installed and connected on the inner wall of the lower end of the vertical cylinder (61). The other end of the outer branch pipe (66) is connected to the annular blowing shell (67), and a plurality of blowing ports are arranged in an annular shape on the annular blowing shell (67). An exhaust valve (68) is installed and connected on the pipe wall of the outer branch pipe (66). A filter frame (7) is installed and connected at the opening, and filter ports are provided at both ends of the filter frame (7), and filter screens (71) are installed and connected at both filter ports; When the driving shaft (63) drives the piston (64) to slide in the opposite direction inside the vertical cylinder (61) and approaches the air inlet valve (65), the piston (64) discharges the air inside the vertical cylinder (61) through the outer branch pipe (66), and the discharged air is discharged to the inside of the annular blowing shell (67) through the exhaust valve (68) on the outer branch pipe (66). The evenly blown air automatically blows away the dust swept off the two filter screens (71) at the opening.

2. A fire investigator safety helmet with an alarm function according to claim 1, characterized in that: One end of the drive shaft (63) is fixedly connected to the output end of the motor (62); an inner connecting bar (612) is fixedly connected to the inner wall of the vertical cylinder (61); the other end of the drive shaft (63) is rotatably connected to the inner connecting bar (612); a threaded opening is provided in the middle of the piston (64); the drive shaft (63) is a threaded rod; and the piston (64) is threadedly connected to the drive shaft (63).

3. A fire investigator safety helmet with an alarm function according to claim 2, characterized in that: An auxiliary cleaning mechanism (8) is provided at the opening, and the auxiliary cleaning mechanism (8) comprises a thin shaft (81), the upper end of the thin shaft (81) is fixedly connected to the lower end of the driving shaft (63), the thin shaft (81) is rotatably connected to the horizontal plate (611), the lower end of the thin shaft (81) is fixedly connected to the main gear (82), and the lower end outer wall of the vertical cylinder (61) is fixedly connected to a base frame (83), and two cleaning brush assemblies are symmetrically provided on the base frame (83).

4. A fire investigator safety helmet with an alarm function according to claim 3, characterized in that: The cleaning brush assembly comprises a short shaft (84), one end of the short shaft (84) is rotatably connected to the base frame (83), a moving block (85) is provided on the short shaft (84), a cleaning plate (851) is fixedly connected to the moving block (85), a threaded opening is provided on the moving block (85), the short shaft (84) is a reciprocating screw, the moving block (85) is threadedly connected to the short shaft (84), and the other end of the short shaft (84) is fixedly connected to a sub-gear (86), and the sub-gear (86) is meshed with the main gear (82).

5. The fire investigator safety helmet with alarm function according to claim 1, characterized in that: The upper end of the helmet (1) is provided with a top transverse shell (13), and an automatic alarm mechanism (9) is provided inside the top transverse shell (13). The automatic alarm mechanism (9) includes a siren (91), and the siren (91) is fixedly installed in the middle of the top transverse shell (13). An electromagnet (92) is fixedly connected to the inner wall of the middle part of the top transverse shell (13). Both ends of the top transverse shell (13) are fixedly connected with embedded blocks. Both end walls of the top transverse shell (13) are provided with small openings, and both ends of the top transverse shell (13) are provided with ejection warning components.

6. A fire investigator safety helmet with an alarm function according to claim 5, characterized in that: The ejection warning assembly includes a slide bar (93), the slide bar (93) is slidably connected to the embedded block, one end of the slide bar (93) is fixedly connected to a magnetic block (931), the magnetic pole of the magnetic block (931) is the same as that of the electromagnet (92), a spring (94) is sleeved on the slide bar (93), one end of the spring (94) is connected to the magnetic block (931), and the other end of the spring (94) is connected to the embedded block, one end of the slide bar (93) is installed and connected to a warning light (95), the other end of the slide bar (93) is fixedly connected to a protective plate (932), a small contact block (96) is provided on the magnetic block (931), and a contact strip (97) is provided on the inner wall of the top transverse shell (13).

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