Dangerous condition alarm device based on laboratory environment safety

Abstract

The invention relates to the technical field of laboratory alarm devices, in particular to a dangerous condition alarm device based on laboratory environment safety, which comprises a monitor and an alarm and further comprises a shell, the alarm is arranged on the shell, a vertical cylinder is arranged in the shell, an air outlet is formed in the top of the vertical cylinder, and a first fan is arranged at the air outlet. A mounting opening is formed in the bottom of the vertical cylinder, a lock cover is arranged at the mounting opening, a mounting frame is arranged on the lock cover, air inlet cylinders are arranged on the two sides of the vertical cylinder in the shell and communicate with the interior of the lower end of the vertical cylinder through guide pipes, an air inlet is formed in one end of each air inlet cylinder, a filter screen is arranged at the air inlet, and a second fan is arranged in each air inlet cylinder; according to the invention, through rotation of the second fan and cooperation of the linkage rod and the vibration mechanism, the filter screen is vibrated, so that dust on the filter screen falls off, and the dust is prevented from entering the vertical cylinder to influence work of the monitor.

Description

Technical Field

[0001] The invention relates to the technical field of laboratory alarm devices, and in particular to a dangerous situation alarm device based on laboratory environmental safety. Background Art

[0002] In modern scientific research and industrial production, the safety and stability of the laboratory environment are of vital importance. Laboratories often involve various chemical reagents, biological samples and precision instruments. The presence of these elements makes the monitoring of laboratory air quality a key link in protecting the health of laboratory personnel, maintaining the normal operation of equipment and preventing environmental pollution. However, traditional laboratory environment monitoring systems often have problems such as limited monitoring range, slow response speed, and high maintenance costs, especially in dealing with dust, particulate matter and potentially hazardous gases in the air.

[0003] The currently disclosed Chinese patent CN218676211U provides a chemical laboratory toxic gas leakage alarm, which belongs to the technical field of alarms. The key points of its technical solution include a main body box, a ventilation box fixedly connected to the top of the ventilation box, a fixed block fixedly connected to the top of the ventilation box, four alarms arranged on the surface of the fixed block, and a drug absorption mechanism fixedly connected to the inside of the main body box; the drug absorption mechanism includes a fan, a pipeline, a first stretching tube and an air expansion bucket, and the surface of the fan is fixedly connected to the inner wall of the main body box, which solves the problem that the existing poison gas alarm is generally fixed on the wall and fixed at one point for detection. When the poison gas leaks, it takes a certain amount of time to move to the inside of the alarm. During the movement, the personnel cannot feel the poison gas. When the alarm sounds, the personnel will evacuate. During this process, the poison gas has entered the inside of the personnel's body to harm the personnel, thereby affecting the safety of the personnel.

[0004] However, the alarm device described in the above patent is prone to filter clogging due to dust accumulation after long-term operation, which in turn affects air circulation and monitoring accuracy. In addition, when there is a leak of harmful gas or abnormal air quality in the laboratory environment, the traditional monitoring method cannot respond quickly and issue an alarm, posing a potential threat to experimenters and laboratory safety. Therefore, in order to overcome the above technical defects and improve the efficiency and accuracy of laboratory environment monitoring, there is an urgent need for an alarm device that can automatically clean the filter, monitor air quality in real time and quickly respond to dangerous situations. Summary of the invention

[0005] In view of the above problems, the present invention provides a dangerous situation alarm device based on laboratory environmental safety, which specifically adopts the following technical solutions.

[0006] A dangerous situation alarm device based on laboratory environmental safety includes a monitor and an alarm, and also includes a shell. The alarm is arranged on the shell, a vertical cylinder is provided at the inner center of the shell, an air outlet is provided at the top of the vertical cylinder, a first fan is provided at the air outlet, a mounting port is provided at the bottom of the vertical cylinder, a detachable lock cover is provided at the mounting port, a mounting frame is provided on the lock cover located inside the vertical cylinder, the monitor is arranged on the mounting frame, vertically arranged air inlets are respectively provided on both sides of the vertical cylinder in the shell, the air inlet is connected with the lower end of the vertical cylinder through a guide pipe, an air inlet is provided at one end of the air inlet, a filter screen that can move up and down is provided at the air inlet, a second fan is provided at the inner upper end of the air inlet, a linkage rod is provided at the center of the fan, one end of the linkage rod extends in the direction of the filter screen and is provided with a vibration mechanism that can vibrate the filter screen.

[0007] Preferably, the vibration mechanism includes an end head, a bent rod and an annular slide, the annular slide is arranged around the bottom edge of the filter screen, the linkage rod extends downward along the center of the filter screen, the filter screen is provided with a through hole for allowing the linkage rod to pass through, the end head is arranged at the extended end of the linkage rod, the bent rod is symmetrically arranged at the end of the end head, the ends of the two bent rods extend toward the interior of the annular slide respectively, the extended end of the bent rod is provided with a first ball that can slide in the annular slide, the interior of the annular slide is provided with two symmetrically arranged slopes, the height of the slope is lower than the depth of the annular slide.

[0008] Preferably, the top of the filter is provided with a plurality of limit posts distributed at equal intervals along the circumferential direction of the filter, and the inner wall of the lower end of the air inlet tube is provided with an extension plate corresponding to each limit post, and the extension plate is provided with a through hole for the limit post to pass through, and a spring is sleeved on the limit post, and the two ends of the spring are respectively abutted against the upper surface of the filter and the bottom of the extension plate.

[0009] Preferably, the air inlet tube is provided with an anti-collision cover at the position of the air inlet, an opening is provided at the center of the anti-collision cover, and the end and the bent rod are both arranged inside the anti-collision cover.

[0010] Preferably, a plurality of second balls are provided on the circumferential surface of the filter and are evenly spaced along the circumferential direction of the filter. The second balls are freely rotatable on the circumferential surface of the filter, and a vertical slide groove is provided on the inner wall of the air inlet cylinder for the second balls to move up and down.

[0011] Preferably, a synchronous belt transmission mechanism is provided inside the shell between the two air inlet cylinders, and the synchronous belt transmission mechanism includes a rotating motor, a driving wheel and a driven wheel. A rotating shaft is vertically provided at the center of the upper end of the air inlet cylinder, one end of the rotating shaft extends to the inside of the air inlet cylinder and is connected to the center of the second fan. The number of driven wheels is the same as the number of rotating shafts and are installed on the rotating shafts in a one-to-one correspondence. The rotating motor is arranged inside the shell through a bracket, and the driving wheel is arranged on the output shaft of the rotating motor. The driving wheel and the two driven wheels are connected by a synchronous belt transmission.

[0012] Preferably, the mounting frame is composed of a plurality of disc-shaped frames, and any two adjacent disc-shaped frames are rotatably connected via a first rotating shaft, and the bottom center of the lowest disc-shaped frame is rotatably connected to the top center of the lock cover via a second rotating shaft, and a mounting groove for horizontally placing the monitor is provided on the disc-shaped frame.

[0013] Preferably, the lock cover is provided with a plug extending toward the interior of the vertical cylinder, and the plug is sleeved with a sealing ring that fits tightly with the inner wall of the vertical cylinder.

[0014] Preferably, the lock cover is arranged at the installation opening of the vertical cylinder by means of a threaded connection, and a handle is arranged on the outside of the lock cover.

[0015] Preferably, a top cover is provided on the shell at the air outlet of the vertical cylinder, and the top cover is located directly above the air outlet of the vertical cylinder. A plurality of air vents are provided at the edge of the top cover.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. When the present invention is in use, the air in the laboratory enters the lower end of the vertical cylinder through the guide tube, and under the suction of the first fan, the air flows from bottom to top along the vertical cylinder. The air is monitored in real time by various monitors in the vertical cylinder. The monitor detects the air passing through the vertical cylinder in real time. If abnormal or dangerous gases are detected, the monitor will trigger the alarm to sound an alarm, reminding laboratory personnel to take necessary safety measures to ensure that the air quality or potential dangerous gases in the laboratory environment can be detected in time.

[0018] 2. The present invention rotates the second fan and drives the linkage rod to rotate at the same time, and the linkage rod drives the vibration mechanism to vibrate the filter. Specifically, the first ball and the slope cooperate with each other to drive the filter to vibrate, so that dust on the filter falls off, thereby automatically cleaning the filter, maintaining smooth air flow, and preventing dust from entering the vertical cylinder to affect the work of the monitor, thereby affecting the alarm and failing to sound an alarm in time.

[0019] 3. Through the coordinated action of the linkage rod, the bent rod and the first ball, the filter screen will be subjected to an upward force and generate vibration. At this time, the limit column will slide along the perforation on the extension plate and will quickly return to its original position with the action of the spring. During this process, the filter screen will generate obvious vibration, thereby effectively shaking off the dust and impurities attached to the surface. The presence of the spring enables the filter screen to maintain a certain elasticity and stability during the vibration process, thereby avoiding damage or deformation caused by excessive vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the three-dimensional structure of the dangerous situation alarm device based on laboratory environment safety in the present invention. Figure 1 .

[0021] Figure 2 yes Figure 1 Another perspective of the three-dimensional structure Figure 2 .

[0022] Figure 3 It is a partial cross-sectional view of the dangerous situation alarm device based on laboratory environment safety in the present invention.

[0023] Figure 4 yes Figure 3 Schematic diagram of the three-dimensional structure.

[0024] Figure 5 yes Figure 4 Enlarged view of point A in the middle.

[0025] Figure 6 It is a partial three-dimensional structural schematic diagram of the vibration mechanism of the dangerous situation alarm device based on laboratory environment safety in the present invention.

[0026] Figure 7 yes Figure 4 Enlarged view of point B in the middle.

[0027] Figure 8 It is a three-dimensional structural schematic diagram of a synchronous belt transmission mechanism of a dangerous situation alarm device based on laboratory environment safety in the present invention.

[0028] Fig. 9 yes Figure 4 Enlarged view of point C in the middle.

[0029] Fig.10 It is a schematic diagram of the installation of the mounting frame in the present invention.

[0030] Fig.11 It is a schematic diagram of the disassembled structure of the mounting frame in the present invention.

[0031] The numbers in the figure are: 1, monitor; 2, alarm; 3, housing; 31, top cover; 32, vent; 4, vertical tube; 41, air outlet; 411, first fan; 42, installation port; 421, lock cover; 4211, installation groove; 4212, plug; 4213, sealing ring; 4214, handle; 422, mounting frame; 4221, disc frame; 42211, first rotating shaft; 42212, second rotating shaft; 5, air inlet; 51, air inlet; 511, filter; 5 111, through-hole; 5112, limit column; 5113, extension plate; 5114, spring; 5115, second ball; 5116, vertical slide; 512, anti-collision cover; 52, linkage rod; 53, vibration mechanism; 531, end; 532, bent rod; 5321, first ball; 533, annular slide; 5331, slope; 54, second fan; 6, guide pipe; 71, rotating motor; 72, driving wheel; 73, driven wheel; 74, synchronous belt; 75, rotating shaft. DETAILED DESCRIPTION

[0032] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] like Figures 1 to 4 As shown, it is a schematic diagram of the structure of the dangerous situation alarm device based on laboratory environment safety in the present invention. The alarm device in this embodiment includes a monitor 1, an alarm 2 and a housing 3. The alarm 2 is arranged on the housing 3. Figure 3 as well as Figure 4 As shown, a vertical cylinder 4 is provided at the inner center of the shell 3, an air outlet 41 is provided at the top of the vertical cylinder 4, a first fan 411 is provided at the air outlet 41, a mounting opening 42 is provided at the bottom of the vertical cylinder 4, a detachable lock cover 421 is provided at the mounting opening 42, a mounting frame 422 is provided inside the vertical cylinder 4 on the lock cover 421, and the monitor 1 is provided on the mounting frame 422. In this embodiment, the monitor 1 is provided with a variety of sensors, such as a gas leak detector, a smoke detector, a temperature sensor, and a humidity sensor, etc. The monitor 1 is mounted on the mounting frame 422. 2 is assembled in the vertical cylinder 4, and vertical air inlet cylinders 5 are respectively arranged on both sides of the vertical cylinder 4 in the housing 3, and the air inlet cylinder 5 is communicated with the lower end of the vertical cylinder 4 through the guide pipe 6. An air inlet port 51 is arranged at one end of the air inlet cylinder 5, and a filter screen 511 that can move up and down is arranged at the air inlet port 51. A second fan 54 is arranged at the upper end of the air inlet cylinder 5, and a linkage rod 52 is arranged at the center of the fan, and one end of the linkage rod 52 extends toward the direction of the filter screen 511 and is provided with a vibration mechanism 53 that can drive the filter screen 511 to vibrate.

[0034] When the environment in the laboratory is monitored, the first fan 411 rotates, and suction is formed inside the vertical tube 4, which prompts the outside air to enter the vertical tube 4 through the air inlet cylinders 5 located on both sides of the vertical tube 4. The air enters from the air inlet 51 of the air inlet cylinder 5 and passes through the filter 511 to filter out dust and particulate matter in the air to prevent impurities from entering the vertical tube 4. After being filtered by the filter 511, the air enters the lower end of the vertical tube 4 through the guide pipe 6, and under the suction of the first fan 411, the air flows from bottom to top along the vertical tube 4. The air passes through various monitors 1 in the vertical tube 4, such as gas leak detectors, smoke detectors, temperature sensors, and humidity sensors, for real-time monitoring. The monitor 1 detects the air passing through the vertical tube 4 in real time. If abnormal or dangerous gas is detected, the monitor 1 will trigger the alarm 2 to sound an alarm, reminding laboratory personnel to take necessary safety measures to ensure that the air quality or potential dangerous gases in the laboratory environment can be detected in time. Secondly, in order to prevent the filter 511 from being blocked due to dust accumulation, the filter 511 can be cleaned regularly. During cleaning, the second fan 54 rotates and drives the linkage rod 52 to rotate at the same time. The linkage rod 52 drives the vibration mechanism 53 to vibrate the filter 511, so that the dust on the filter 511 falls off, thereby automatically cleaning the filter 511, maintaining smooth air flow, and preventing dust from entering the vertical cylinder 4 to affect the operation of the monitor 1, thereby affecting the alarm 2 from being able to alarm in time.

[0035] Reference Figures 3 to 6 The vibration mechanism 53 includes an end 531, a bent rod 532 and an annular slide 533. The annular slide 533 is arranged around the bottom edge of the filter screen 511. The linkage rod 52 extends downward along the center of the filter screen 511. The filter screen 511 is provided with a through hole 5111 for avoiding the linkage rod 52 to pass through. The end 531 is arranged at the extended end of the linkage rod 52. The bent rod 532 is symmetrically arranged at the end of the end 531. The ends of the two bent rods 532 extend toward the inside of the annular slide 533 respectively. The extended end of the bent rod 532 is provided with a first ball 5321 that can slide in the annular slide 533. The inside of the annular slide 533 is provided with two symmetrically arranged slopes 5331. The height of the slope 5331 is lower than the depth of the annular slide rail.

[0036] When the second fan 54 starts to rotate, the second fan 54 drives the linkage rod 52 to rotate, and the linkage rod 52 drives the end 531 and the two bent rods 532 to rotate, so that the bent rod 532 can rotate synchronously with the rotation of the linkage rod 52. During the rotation, the first roller arranged at the end of the bent rod 532 rolls along the inner wall of the annular slide 533. The interior of the annular slide 533 is provided with two symmetrical slopes 5331. When the first ball 5321 on the bent rod 532 rolls onto the slope 5331, due to the inclination of the slope 5331, the filter 511 can be driven to vibrate, and the dust and impurities attached to the filter 511 will be effectively shaken off and separated from the filter 511, thereby maintaining the cleanliness and ventilation efficiency of the filter 511, thereby realizing the vibration cleaning function of the filter 511.

[0037] Reference Figure 7 As shown: the top of the filter 511 is provided with a plurality of limit posts 5112 distributed at equal intervals along the circumferential direction of the filter 511, and the inner wall of the lower end of the air inlet tube 5 is provided with an extension plate 5113 corresponding to each limit post 5112, and the extension plate 5113 is provided with a through hole for the limit post 5112 to pass through, and the limit post 5112 is sleeved with a spring 5114, and the two ends of the spring 5114 are respectively abutted against the upper surface of the filter 511 and the bottom of the extension plate 5113.

[0038] When the vibration mechanism 53 is working, the filter screen 511 vibrates through the coordinated action of the linkage rod 52, the bent rod 532 and the first ball 5321. At this time, the limiting column 5112 will slide along the perforation on the extension plate 5113, and the spring 5114 will be compressed and store energy. When the force of the vibration mechanism 53 disappears or weakens, the filter screen 511 will quickly return to its original position due to its own gravity and the elastic force of the spring 5114. In this process, the filter screen 511 will produce obvious vibrations, thereby effectively shaking off the dust and impurities attached to the surface. The existence of the spring 5114 enables the filter screen 511 to maintain a certain elasticity and stability during the vibration process, thereby avoiding damage or deformation caused by excessive vibration.

[0039] Reference Figure 5 As shown, the air inlet tube 5 is provided with an anti-collision cover 512 at the position of the air inlet, an opening is provided at the center of the anti-collision cover 512 , and the end 531 and the bent rod 532 are both arranged inside the anti-collision cover 512 .

[0040] The anti-collision cover 512 is mounted on the air inlet of the air inlet tube 5, and is mainly used to prevent the staff, equipment or other objects in the laboratory from accidentally colliding with the rotating bent rod 532. An opening is provided at the center of the anti-collision cover 512 to allow air to smoothly enter the air inlet tube 5.

[0041] Reference Figure 7As shown: a plurality of second balls 5115 are arranged on the circumferential surface of the filter 511 and are distributed at equal intervals along the circumferential direction of the filter 511. The second balls 5115 are freely rotatable on the circumferential surface of the filter 511, and a vertical slide groove 5116 is arranged on the inner wall of the air inlet cylinder 5 for the second balls 5115 to move up and down.

[0042] When the vibration mechanism 53 is working, the filter 511 is subjected to an upward force and vibrates. At this time, the second ball 5115 rolls freely in the vertical slide groove 5116, reducing the sliding friction between the filter 511 and the inner wall of the air inlet tube 5, thereby reducing the resistance and wear during the vibration process, helping to maintain the stability of the filter 511 and preventing the filter 511 from shifting or rotating during the vibration process.

[0043] Reference Figure 8 and Fig. 9 As shown: a synchronous belt transmission mechanism is provided inside the shell 3 between the two air inlet cylinders 5, and the synchronous belt transmission mechanism includes a rotating motor 71, a driving wheel 72 and a driven wheel 73. A rotating shaft 75 is vertically provided at the center of the upper end of the air inlet cylinder 5. One end of the rotating shaft 75 extends into the air inlet cylinder 5 and is connected to the center of the second fan 54. The number of driven wheels 73 is the same as the number of rotating shafts 75 and they are installed on the rotating shafts 75 in a one-to-one correspondence. The rotating motor 71 is arranged inside the shell 3 through a bracket, and the driving wheel 72 is arranged on the output shaft of the rotating motor 71. The driving wheel 72 and the two driven wheels 73 are connected through a synchronous belt 74.

[0044] When it is necessary to drive the second fan 54 in each air inlet tube 5 to rotate, start the rotating motor 71, and the output shaft of the rotating motor 71 drives the driving wheel 72 to rotate. The driving wheel 72 is connected to the two driven wheels 73 through a synchronous belt 74, so that the second fans 54 in the two air inlet tubes 5 can achieve synchronous rotation, ensuring that the fans in the two air inlet tubes 5 rotate at the same speed and direction, thereby avoiding the problem of unstable air flow caused by inconsistent fan speeds. In addition, the rotation of the second fan 54 drives the linkage rod 52 to rotate, which can drive the filter screen 511 to vibrate to remove dust and impurities on the surface of the filter screen 511.

[0045] Reference Fig.10 and Fig.11As shown: the mounting frame 422 is composed of a plurality of disc-shaped frames 4221, and any two adjacent disc-shaped frames 4221 are rotatably connected via a first rotating shaft 42211, and the bottom center of the lowest disc-shaped frame 4221 is rotatably connected to the top center of the lock cover 421 via a second rotating shaft 42212, and a mounting groove 4211 for horizontally placing the monitor 1 is provided on the disc-shaped frame 4221, and a plurality of disc-shaped frames 4221 can be provided to mount monitors 1 with different functions, so as to facilitate monitoring of the air in the laboratory.

[0046] The corresponding monitor 1 is horizontally installed on the disc frame 4221 through the installation groove 4211, and the multiple disc frames 4221 are rotatably connected through the first rotating shaft 4221, so that adjacent disc frames 4221 can rotate relative to each other, so that the angle between each disc frame 4221 can be adjusted according to actual installation requirements, so that the monitor 1 in each disc frame 4221 is staggered at the center of the vertical cylinder 4, thereby improving the coverage and contact efficiency of the monitor 1 to the air. When the air enters the vertical cylinder 4 and flows from bottom to top, the staggered monitors 1 enable the monitor 1 to more effectively capture harmful substances or dangerous gases in the air, thereby improving the accuracy and reliability of monitoring.

[0047] Reference Fig.10 As shown: the lock cover 421 is provided with a plug 4212 extending a certain distance into the vertical tube 4, the extending end of the plug 4212 is close to and does not exceed the connection between the guide tube 6 and the vertical tube 4, and the plug 4212 is sleeved with a sealing ring 4213 that fits tightly with the inner wall of the vertical tube 4.

[0048] The plug 4212 extends toward the interior of the vertical cylinder 4, ensuring that the lock cover 421 can tightly seal the installation opening 42 of the vertical cylinder 4 when closed, preventing external air or pollutants from directly entering the interior of the vertical cylinder 4 without being monitored and affecting the accuracy of the monitoring results. A sealing ring 4213 is sleeved on the plug 4212, which fits tightly with the inner wall of the vertical cylinder 4, further enhancing the sealing between the lock cover 421 and the vertical cylinder 4.

[0049] Reference Fig.10 As shown, the locking cover 421 is arranged at the installation opening 42 of the vertical tube 4 by means of threaded connection, and a handle 4214 is arranged on the outside of the locking cover 421 .

[0050] When the monitor 1 needs to be installed or replaced, the user can easily open or close the installation opening 42 of the vertical cylinder 4 by rotating the lock cover 421 through the handle 4214, thereby improving user convenience.

[0051] Reference Figure 2 and Figure 4As shown, a top cover 31 is provided on the shell 3 at the air outlet 41 of the vertical tube 4 . The top cover 31 is located directly above the air outlet 41 of the vertical tube 4 . A plurality of vents 32 are provided at the edge of the top cover 31 .

[0052] The top cover 31 is designed to serve as a barrier layer to prevent dust and pollutants in the air from entering the interior of the vertical cylinder 4 and thus affecting the monitoring performance.

[0053] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A dangerous situation alarm device based on laboratory environmental safety, comprising a monitor (1) and an alarm (2), characterized in that: The dangerous situation alarm device also includes a shell (3), the alarm (2) is arranged on the shell (3), a vertical tube (4) is arranged at the center of the shell (3), an air outlet (41) is arranged at the top of the vertical tube (4), a first fan (411) is arranged at the air outlet (41), a mounting opening (42) is arranged at the bottom of the vertical tube (4), a detachable lock cover (421) is arranged at the mounting opening (42), a mounting frame (422) is arranged on the lock cover (421) and located inside the vertical tube (4), the monitor (1) is arranged on the mounting frame (422), and a lock cover (421) is arranged at the bottom of the vertical tube (4). A vertically arranged air inlet cylinder (5) is provided on both sides of the vertical cylinder (4), the air inlet cylinder (5) is connected to the interior of the lower end of the vertical cylinder (4) through a guide tube (6), an air inlet port (51) is provided at one end of the air inlet cylinder (5), a filter screen (511) that can move up and down is provided at the air inlet port (51), a second fan (54) is provided at the upper end of the interior of the air inlet cylinder (5), a linkage rod (52) is provided at the center of the fan, one end of the linkage rod (52) extends in the direction of the filter screen (511) and is provided with a vibration mechanism (53) that can vibrate the filter screen (511).

2. A dangerous situation alarm device based on laboratory environment safety according to claim 1, characterized in that: The vibration mechanism (53) comprises an end (531), a bent rod (532) and an annular slideway (533). The annular slideway (533) is arranged around the bottom edge of the filter screen (511). The linkage rod (52) extends downward along the center of the filter screen (511). The filter screen (511) is provided with a through hole (5111) for avoiding the linkage rod (52) to pass through. The end (531) is arranged at the extended end of the linkage rod (52). The bent rod (532) is symmetrically arranged at the end of the end (531). The ends of the two bent rods (532) extend toward the inside of the annular slideway (533) respectively. The extended end of the bent rod (532) is provided with a first ball (5321) capable of sliding in the annular slideway (533). The inside of the annular slideway (533) is provided with two symmetrically arranged slopes (5331). The height of the slope (5331) is lower than the depth of the annular slideway.

3. A dangerous situation alarm device based on laboratory environment safety according to claim 2, characterized in that: A plurality of limiting posts (5112) are arranged at equal intervals along the circumferential direction of the filter screen (511) at the top of the filter screen (511); an extension plate (5113) corresponding to each limiting post (5112) is arranged on the inner wall of the lower end of the air inlet cylinder (5); a through hole is arranged on the extension plate (5113) for the limiting post (5112) to pass through; a spring (5114) is sleeved on the limiting post (5112); two ends of the spring (5114) are respectively in contact with the upper surface of the filter screen (511) and the bottom of the extension plate (5113).

4. A dangerous situation alarm device based on laboratory environment safety according to claim 3, characterized in that: The air inlet tube (5) is provided with an anti-collision cover (512) at the position of the air inlet, the center of the anti-collision cover (512) is provided with an opening, and the end head (531) and the bent rod (532) are both arranged inside the anti-collision cover (512).

5. A dangerous situation alarm device based on laboratory environment safety according to claim 4, characterized in that: A plurality of second balls (5115) are arranged on the circumferential surface of the filter screen (511) and are distributed at equal intervals along the circumferential direction of the filter screen (511). The second balls (5115) are arranged on the circumferential surface of the filter screen (511) so as to be freely rotatable. A vertical slide groove (5116) for the second balls (5115) to move up and down is arranged on the inner wall of the air inlet cylinder (5).

6. A dangerous situation alarm device based on laboratory environment safety according to claim 1, characterized in that: A synchronous belt transmission mechanism is provided inside the housing (3) and between the two air inlet cylinders (5). The synchronous belt transmission mechanism comprises a rotating motor (71), a driving wheel (72) and a driven wheel (73). A rotating shaft (75) is vertically provided at the center of the upper end of the air inlet cylinder (5). One end of the rotating shaft (75) extends into the interior of the air inlet cylinder (5) and is connected to the center of the second fan (54). The number of driven wheels (73) is the same as the number of rotating shafts (75) and they are mounted on the rotating shafts (75) in a one-to-one correspondence. The rotating motor (71) is arranged inside the housing (3) through a bracket. The driving wheel (72) is arranged on the output shaft of the rotating motor (71). The driving wheel (72) and the two driven wheels (73) are connected to each other through a synchronous belt (74).

7. The dangerous situation alarm device based on laboratory environment safety according to claim 1 is characterized in that: The mounting frame (422) is composed of a plurality of disc-shaped frames (4221), wherein two adjacent disc-shaped frames (4221) of the plurality of disc-shaped frames (4221) are rotationally connected via a first rotating shaft (42211), and the bottom center of the lowest disc-shaped frame (4221) is rotationally connected to the top center of the lock cover (421) via a second rotating shaft (42212), and a mounting groove (4211) for horizontally placing the monitor (1) is provided on the disc-shaped frame (4221).

8. The dangerous situation alarm device based on laboratory environment safety according to claim 1 is characterized in that: The lock cover (421) is provided with a plug (4212) extending toward the interior of the vertical cylinder (4), and the plug (4212) is sleeved with a sealing ring (4213) that fits tightly against the inner wall of the vertical cylinder (4).

9. The dangerous situation alarm device based on laboratory environment safety according to claim 1 is characterized in that: The locking cover (421) is arranged at the installation opening (42) of the vertical cylinder (4) by means of threaded connection, and a handle (4214) is arranged outside the locking cover (421).

10. The dangerous situation alarm device based on laboratory environment safety according to claim 1 is characterized in that: A top cover (31) is provided on the shell (3) at the air outlet (41) of the vertical cylinder (4). The top cover (31) is located directly above the air outlet (41) of the vertical cylinder (4). A plurality of vents (32) are provided at the edge of the top cover (31).

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