CN112781653B - Chemical laboratory environment detection monitoring device and monitoring method thereof - Google Patents
Chemical laboratory environment detection monitoring device and monitoring method thereof Download PDFInfo
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- CN112781653B CN112781653B CN202011627336.2A CN202011627336A CN112781653B CN 112781653 B CN112781653 B CN 112781653B CN 202011627336 A CN202011627336 A CN 202011627336A CN 112781653 B CN112781653 B CN 112781653B
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- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Abstract
The invention discloses a chemical laboratory environment detection monitoring device and a monitoring method thereof, the device comprises a detection box, a gas detector and a buzzer, wherein the outer side wall of the detection box is provided with a through groove, the inner side wall of the through groove is provided with a sealing groove, the inner side wall of the sealing groove is connected with a purification mechanism in a sliding way, the purification mechanism is tightly propped against the inner side wall of the through groove, the gas detector is fixedly arranged on the inner side wall of the detection box, the inner side wall of the detection box is fixedly connected with a shaft sleeve, the inner side wall of the shaft sleeve is connected with a connecting rod in a sliding way, the outer side wall of the connecting rod is fixedly connected with an impact plate, the tail end of the connecting rod is fixedly connected with a pull rope, a fan rotates to suck gas in a chemical laboratory into the detection box through an air inlet pipe, and harmful gas in the air can be detected through the gas detector along with the suction of the gas, the harm to the body of an experimenter caused by the exceeding of harmful gas in a chemical laboratory is avoided.
Description
Technical Field
The invention relates to the technical field of environmental detection and monitoring, in particular to a chemical laboratory environmental detection monitoring device and a monitoring method thereof.
Background
Chemical laboratories are an important place for providing chemical experimental conditions and scientific exploration thereof. There are a number of instruments inside: an iron stand, an asbestos net, an alcohol lamp and other experimental tools. Usually, a chemical cabinet is provided, and the medicine cabinet contains the commonly used chemicals.
The chemical experiment often can produce toxic gas, such as nitrogen monoxide, nitrogen dioxide, sulfur dioxide and benzene class gas etc. and in the chemical laboratory that often carries out the chemical experiment, all there is toxic gas to because the complexity of chemical experiment, the composition of toxic gas is also more complicated, can cause very big harm to staff's healthy, can threaten life safety even, consequently it is very necessary to carry out the toxic gas detection to the chemical laboratory. In chemical reactions, heat is often required to accelerate the reaction, and many chemical agents are flammable, thereby easily causing fire.
Traditional chemistry experiment room environmental detection monitoring device only can detect the gas content in the laboratory, nevertheless can't filter the harmful gas in the laboratory to the filter screen exposes for a long time or reduces the filter efficiency of filter screen to harmful gas, when the conflagration breaing out in the laboratory simultaneously, lacks the timely warning and effectively putting out a fire to the conflagration, makes the conflagration bigger and bigger, thereby leads to personnel and property to receive the injury.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a chemical laboratory environment detection monitoring device and a monitoring method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a chemical laboratory environment detection monitoring device comprises a detection box, a gas detector and a buzzer, wherein a through groove is formed in the outer side wall of the detection box, a sealing groove is formed in the inner side wall of the through groove, a purifying mechanism is connected to the inner side wall of the sealing groove in a sliding manner and is abutted against the inner side wall of the through groove, the gas detector is fixedly installed on the inner side wall of the detection box, a shaft sleeve is fixedly connected to the inner side wall of the detection box, a connecting rod is connected to the inner side wall of the shaft sleeve in a sliding manner, an impact plate is fixedly connected to the outer side wall of the connecting rod, a pull rope is fixedly connected to the tail end of the connecting rod, a fixed pulley is fixedly connected to the inner side wall of the detection box, the pull rope and the outer side wall of the fixed pulley are arranged in a winding manner, the pull rope penetrates through the outer side wall of the detection box and extends into the through groove, and fixed boxes are symmetrically and fixedly connected to the inner side wall of the detection box, the detection box comprises a fixed box, a detection box and a buzzer, wherein the outer side wall of the fixed box is provided with a connecting groove, the inner side wall of the fixed box is fixedly connected with an air bag, the tail end of the air bag is fixedly connected with a transmission rod, the outer side wall of the transmission rod is fixedly connected with a string, the string penetrates through the outer side wall of the detection box, the buzzer is fixedly installed on the inner side wall of the detection box, the tail end of the buzzer sequentially penetrates through the outer side wall of the detection box and the outer side wall of the fixed box, the tail end of the buzzer extends to the inside of the fixed box, the outer side wall of the detection box is symmetrically and fixedly connected with a water pipe, the outer side wall of the water pipe is provided with a limiting groove, the inner side wall of the limiting groove is slidably connected with a closing mechanism, the closing mechanism is abutted against the inner side wall of the water pipe, the outer side wall of the detection box is provided with a positioning groove, and the inner side wall of the positioning groove is fixedly connected with an air inlet pipe, the air inlet pipe comprises an air inlet pipe and is characterized in that a first filter screen is fixedly connected to the inner side wall of the air inlet pipe, a supporting rod is fixedly connected to the inner side wall of the air inlet pipe, a fan is fixedly connected to the outer side wall of the supporting rod, and a spray head is fixedly connected to the tail end of a water pipe.
Preferably, purification mechanism includes the second filter screen of sliding connection on the seal groove inside wall, the first spring of fixedly connected with on the lateral wall of second filter screen, the terminal of first spring and the inside wall fixed connection of seal groove, the terminal fixed connection of the terminal of stay cord and second filter screen, the terminal of second filter screen offsets tightly with the inside wall that runs through the groove.
Preferably, the closing mechanism includes the closing plate of sliding connection on the spacing inslot lateral wall, fixedly connected with second spring on the lateral wall of closing plate, the terminal lateral wall fixed connection of second spring and water pipe, the terminal lateral wall fixed connection of end and closing plate of string, the terminal inside wall counterbalance of closing plate and water pipe is tight.
Preferably, the second spring is wound around the outer side wall of the sealing plate, and the second spring is made of spring steel.
Preferably, the string is in a relaxed state.
Preferably, a plurality of spraying holes are formed in the outer side wall of the spray head.
Preferably, the joint of the inner side wall of the fixed box and the inner side wall of the detection box is provided with heat-conducting silicone grease.
Preferably, the first filter screen is made of austenitic stainless steel.
A chemical laboratory environment detection monitoring method comprises the following steps:
s1: the air blower is started, rotates to absorb gas in the chemical laboratory, the gas is sucked into the detection box through the gas inlet pipe, and harmful gas in the chemical laboratory can be monitored and detected in real time through the gas detector;
s2: the fan generates wind power to blow the impact plate in the rotating process, so that the impact plate moves upwards, the impact plate drives the pull rope to move upwards through the connecting rod, the second filter screen moves leftwards, and harmful gas in a chemical laboratory can be filtered through the second filter screen;
s3: when the conflagration condition appeared in the chemistry experiment room, the temperature risees and makes the gasbag begin to expand, and gasbag inflation promotion transfer line outside motion offsets tightly with bee calling organ, and then makes bee calling organ begin to work and warn staff on every side, and the outside spur string of transfer line simultaneously to make the inside rivers of water pipe flow into the shower nozzle, the rethread is seted up the hole that sprays on the shower nozzle inside wall and is discharged, carries out water spray to conflagration department and puts out a fire.
Compared with the prior art, the invention has the beneficial effects that:
1. through starting the fan, the fan rotates the inside that inhales the detection case with gas in the chemistry experiment room through the intake pipe, along with gaseous the absorption, can detect harmful gas in the air through the gas detection appearance, avoids the harmful gas in the chemistry experiment room to exceed standard and causes the harm to laboratory staff's health.
2. The inside gas that emits into the detection case can strike the impingement plate, thereby make the impingement plate upward movement, the impingement plate passes through the connecting rod and drives stay cord upward movement, because the outside wall of stay cord and fixed pulley is around establishing, and then make stay cord pulling second filter screen move left and with the inside wall that runs through the groove counterbalance tightly, the material of second filter screen is active carbon, can absorb the harmful gas in the air, avoid harmful gas directly to discharge to cause the influence to surrounding environment, at laboratory non-live time, fan stall, the connecting rod loses the ascending pulling force to the stay cord, because first spring has right pulling force to make the second filter screen move to the seal groove, avoid the second filter screen to expose in the air for a long time, reduce the purification efficiency to harmful gas of second filter screen.
3. When the conflagration breaing out in chemistry experiment room, the temperature in laboratory constantly risees, the temperature risees makes the gasbag begin to expand, gasbag inflation promotes the transfer line and outwards removes, the transfer line outwards removes and offsets tightly with the end of bee calling organ, bee calling organ begins to work and sends the police dispatch newspaper to staff on every side, make personnel withdraw fast, avoid causing the personnel accident, the transfer line outwards removes the pulling string, the string drives the closing plate outwards to remove, thereby make the inside rivers of water pipe flow into the shower nozzle, the rethread is seted up and is discharged in the hole that sprays on the shower nozzle inside wall, carry out water spray to conflagration department and put out a fire.
Drawings
Fig. 1 is a schematic structural diagram of a chemical laboratory environment detection monitoring apparatus and a monitoring method thereof according to the present invention;
FIG. 2 is an enlarged view of part A of the present invention;
FIG. 3 is an enlarged view of portion B of the present invention;
FIG. 4 is an enlarged view of portion C of the present invention;
FIG. 5 is an enlarged view of portion D of the present invention;
fig. 6 is an enlarged view of part E of the present invention.
In the figure: the device comprises a detection box 1, a through groove 2, a gas detector 3, a water pipe 4, a pull rope 5, a fixing box 6, a connecting groove 7, an air bag 8, a transmission rod 9, a positioning groove 10, an air inlet pipe 11, a first filter screen 12, a support rod 13, a fan 14, a sealing groove 15, a second filter screen 16, a first spring 17, a shaft sleeve 18, a connecting rod 19, an impact plate 20, a fixed pulley 21, a sealing plate 22, a limiting groove 23, a second spring 24, a string 25, a buzzer 26, a spray nozzle 27 and a spray hole 28.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-6, a chemical laboratory environment detecting and monitoring device comprises a detection box 1, a gas detector 3, a buzzer 26, a through groove 2 is arranged on the outer side wall of the detection box 1, a sealing groove 15 is arranged on the inner side wall of the through groove 2, a purifying mechanism is connected on the inner side wall of the sealing groove 15 in a sliding manner and is abutted against the inner side wall of the through groove 2, the purifying mechanism comprises a second filter screen 16 connected on the inner side wall of the sealing groove 15 in a sliding manner, a first spring 17 is fixedly connected on the outer side wall of the second filter screen 16, the tail end of the first spring 17 is fixedly connected with the inner side wall of the sealing groove 15, the tail end of a pull rope 5 is fixedly connected with the tail end of the second filter screen 16, the tail end of the second filter screen 16 is abutted against the inner side wall of the through groove 2, harmful gas contained in air can be absorbed by the purifying mechanism, the second filter screen 16 moves into the sealing groove 15 by the right tensile force of the first spring 17, the second filter screen 16 is prevented from being exposed to the air for a long time, and the purification efficiency of the second filter screen 16 on harmful gas is reduced;
the gas detector 3 is fixedly arranged on the inner side wall of the detection box 1, a shaft sleeve 18 is fixedly connected on the inner side wall of the detection box 1, a connecting rod 19 is slidably connected on the inner side wall of the shaft sleeve 18, an impact plate 20 is fixedly connected on the outer side wall of the connecting rod 19, a pull rope 5 is fixedly connected at the tail end of the connecting rod 19, a fixed pulley 21 is fixedly connected on the inner side wall of the detection box 1, the pull rope 5 and the outer side wall of the fixed pulley 21 are arranged in a winding way, the pull rope 5 penetrates through the outer side wall of the detection box 1 and extends to the inside of the through groove 2, a fixed box 6 is symmetrically and fixedly connected on the inner side wall of the detection box 1, heat-conducting silicone grease is arranged at the joint of the fixed box 6 and the inner side wall of the detection box 1, the external temperature can be rapidly transmitted into the fixed box 6 through the heat-conducting silicone grease, a connecting groove 7 is arranged on the outer side wall of the fixed box 6, and an air bag 8 is fixedly connected on the inner side wall of the fixed box 6, the tail end of the air bag 8 is fixedly connected with a transmission rod 9, the outer side wall of the transmission rod 9 is fixedly connected with a string 25, the string 25 penetrates through the outer side wall of the detection box 1, a buzzer 26 is fixedly installed on the inner side wall of the detection box 1, the tail end of the buzzer 26 sequentially penetrates through the outer side wall of the detection box 1 and the outer side wall of the fixing box 6, and the tail end of the buzzer 26 extends into the fixing box 6;
the outer side wall of the detection box 1 is symmetrically and fixedly connected with a water pipe 4, the outer side wall of the water pipe 4 is provided with a limiting groove 23, the inner side wall of the limiting groove 23 is connected with a closing mechanism in a sliding manner, the closing mechanism is abutted against the inner side wall of the water pipe 4 and comprises a sealing plate 22 connected to the inner side wall of the limiting groove 23 in a sliding manner, the outer side wall of the sealing plate 22 is fixedly connected with a second spring 24, the tail end of the second spring 24 is fixedly connected with the outer side wall of the water pipe 4, the second spring 24 is wound with the outer side wall of the sealing plate 22, the second spring 24 is made of spring steel, the spring steel has high tensile strength, elastic limit, fatigue strength and good flexibility, so that a damping effect is achieved through contraction when external force is applied, the tail end of a thin rope 25 is fixedly connected with the outer side wall of the sealing plate 22, the thin rope 25 is in a loose state, when the temperature change in a chemical laboratory is small, string 25 is in the pulling force that can not be right to 22 all the time in lax state, the terminal of closing plate 22 offsets tightly with the inside wall of water pipe 4, constant head tank 10 has been seted up on the lateral wall of detection case 1, fixedly connected with intake pipe 11 on the inside wall of constant head tank 10, first filter screen 12 of fixedly connected with on the inside wall of intake pipe 11, the material of first filter screen 12 is the austenite stainless steel, austenite stainless steel structure is stable difficult for rustting, can use for a long time and need not change, fixedly connected with bracing piece 13 on the inside wall of intake pipe 11, fixedly connected with fan 14 on bracing piece 13's the lateral wall, the terminal fixedly connected with shower nozzle 27 of water pipe 4, a plurality of spray holes 28 have been seted up on shower nozzle 27's the lateral wall, through the rivers can effectively put out a fire to the department of getting on fire.
A chemical laboratory environment detection monitoring method comprises the following steps:
s1: the fan 14 is started, the fan 14 rotates to absorb gas in the chemical laboratory, the gas is sucked into the detection box 1 through the gas inlet pipe 11, and harmful gas in the chemical laboratory can be monitored and detected in real time through the gas detector 3;
s2: the fan 14 generates wind power to blow the impact plate 20 in the rotation process, so that the impact plate 20 moves upwards, the impact plate 20 drives the pull rope 5 to move upwards through the connecting rod 19, the second filter screen 16 moves leftwards, and harmful gas in a chemical laboratory can be filtered through the second filter screen 16;
s3: when the conflagration condition appeared in the chemistry experiment room, the temperature risees and makes gasbag 8 begin to expand, and gasbag 8 inflation promotion transfer line 9 outside motion offsets tightly with bee calling organ 26, and then makes bee calling organ 26 begin to work and warn the staff on every side, and transfer line 9 outwards stimulates the string 25 simultaneously to make the inside rivers of water pipe 4 flow into in the shower nozzle 27, the rethread is seted up and is discharged at the hole 28 that sprays on the shower nozzle 27 inside wall, puts out a fire to the department of conflagration water spray.
In the invention, when the gas detector is used, the fan 14 is started, the fan 14 starts to rotate to generate suction force to suck air in an experiment into the detection box 1, and harmful gas in the air can be detected through the gas detector 3, so that the detection of the harmful gas in the air of a laboratory is realized, and the influence on the health of the experimenter caused by the fact that the surrounding experimenter is in a harmful gas environment for a long time is avoided;
the first filter screen 12 can filter dust and impurities in the air, the air sucked by the rotation of the fan 14 can impact the impact plate 20, the impact plate 20 is a light foam plate, the area is large, the weight is light, the impact plate 20 can move upwards, the impact plate 20 drives the pull rope 5 to move upwards through the connecting rod 19, the pull rope 5 is wound around the outer side wall of the fixed pulley 21, the pull rope 5 pulls the second filter screen 16 to move leftwards and tightly abut against the inner side wall of the through groove 2, the second filter screen 16 is made of activated carbon, harmful gas in the air can be absorbed, the influence of the harmful gas directly discharged to the surrounding environment is avoided, the fan 14 stops rotating during the non-use time of a laboratory, the connecting rod 19 loses the upward pulling force of the pull rope 5, and the second filter screen 16 moves into the sealing groove 15 due to the rightward pulling force of the first spring 17, the second filter 16 is prevented from being exposed to the air for a long time, and the purification efficiency of the second filter 16 to harmful gas is reduced;
when a fire disaster happens in a chemical laboratory, the fire disaster enables the temperature inside the detection box 1 to rise, high temperature enables the air bag 8 to begin to expand, the air bag 8 expands to push the transmission rod 9 to move outwards, the transmission rod 9 moves outwards and abuts against the tail end of the buzzer 26, the buzzer 26 starts to work, the buzzer 26 sends out buzzing to alarm surrounding workers, personnel are evacuated quickly, personnel accidents are avoided being caused, the transmission rod 9 pulls the string 25 outwards again, the string 25 drives the sealing plate 22 to move outwards, water flow inside the water pipe 4 flows into the spray head 27, the water is discharged through the spray holes 28 formed in the inner side wall of the spray head 27, effective fire extinguishment is conducted on the fire disaster, the fire disaster is prevented from being further expanded, and detection and monitoring of the internal environment of the chemical laboratory are achieved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (9)
1. The utility model provides a chemistry experiment room environmental detection monitoring device, includes detection case (1), gas detection appearance (3), bee calling organ (26), its characterized in that, seted up on the lateral wall of detection case (1) and run through groove (2), seted up seal groove (15) on the inside wall that runs through groove (2), sliding connection has purification mechanism on the inside wall of seal groove (15), purification mechanism offsets tightly with the inside wall that runs through groove (2), gas detection appearance (3) fixed mounting is on the inside wall of detection case (1), fixedly connected with axle sleeve (18) on the inside wall of detection case (1), sliding connection has connecting rod (19) on the inside wall of axle sleeve (18), fixedly connected with impingement plate (20) on the outside wall of connecting rod (19), the terminal fixedly connected with stay cord (5) of connecting rod (19), the detection box comprises a detection box (1), a fixed pulley (21) is fixedly connected to the inner side wall of the detection box (1), a pull rope (5) and the outer side wall of the fixed pulley (21) are wound, the pull rope (5) penetrates through the outer side wall of the detection box (1) and extends to the inside of a through groove (2), a fixed box (6) is symmetrically and fixedly connected to the inner side wall of the detection box (1), a connecting groove (7) is formed in the outer side wall of the fixed box (6), an air bag (8) is fixedly connected to the inner side wall of the fixed box (6), a transmission rod (9) is fixedly connected to the tail end of the air bag (8), a thin rope (25) is fixedly connected to the outer side wall of the transmission rod (9), the thin rope (25) penetrates through the outer side wall of the detection box (1), a buzzer (26) is fixedly installed on the inner side wall of the detection box (1), and the tail end of the buzzer (26) penetrates through the outer side wall of the detection box (1) and the outer side wall of the fixed box (6) in sequence, the tail end of the buzzer (26) extends into the fixed box (6), the outer side wall of the detection box (1) is symmetrically and fixedly connected with water pipes (4), a limiting groove (23) is arranged on the outer side wall of the water pipe (4), a closing mechanism is connected on the inner side wall of the limiting groove (23) in a sliding way, the closing mechanism is tightly propped against the inner side wall of the water pipe (4), a positioning groove (10) is arranged on the outer side wall of the detection box (1), an air inlet pipe (11) is fixedly connected on the inner side wall of the positioning groove (10), a first filter screen (12) is fixedly connected on the inner side wall of the air inlet pipe (11), a support rod (13) is fixedly connected on the inner side wall of the air inlet pipe (11), the outer side wall of the supporting rod (13) is fixedly connected with a fan (14), and the tail end of the water pipe (4) is fixedly connected with a spray head (27).
2. The chemical laboratory environment detecting and monitoring device according to claim 1, wherein the purifying mechanism comprises a second filter screen (16) slidably connected to the inner side wall of the sealing groove (15), a first spring (17) is fixedly connected to the outer side wall of the second filter screen (16), the end of the first spring (17) is fixedly connected to the inner side wall of the sealing groove (15), the end of the pull rope (5) is fixedly connected to the end of the second filter screen (16), and the end of the second filter screen (16) is abutted to the inner side wall of the through groove (2).
3. The chemical laboratory environment detecting and monitoring device according to claim 1, wherein the closing mechanism comprises a sealing plate (22) slidably connected to an inner side wall of a limiting groove (23), a second spring (24) is fixedly connected to an outer side wall of the sealing plate (22), a terminal end of the second spring (24) is fixedly connected to an outer side wall of the water pipe (4), a terminal end of the string (25) is fixedly connected to an outer side wall of the sealing plate (22), and a terminal end of the sealing plate (22) abuts against an inner side wall of the water pipe (4).
4. The environmental monitoring device for chemical laboratories according to claim 3, wherein the second spring (24) is wound around the outer sidewall of the sealing plate (22), and the second spring (24) is made of spring steel.
5. A chemical laboratory environment detection monitoring device according to claim 1, characterized in that said string (25) is in a relaxed state.
6. The chemical laboratory environment detecting and monitoring device according to claim 1, wherein a plurality of spraying holes (28) are opened on the outer side wall of the spraying head (27).
7. The chemical laboratory environment detecting and monitoring device according to claim 1, characterized in that the joint of the inner side wall of the fixing box (6) and the detecting box (1) is provided with heat-conducting silicone grease.
8. The chemical laboratory environment detecting and monitoring device according to claim 1, characterized in that the material of the first filter screen (12) is austenitic stainless steel.
9. A chemical laboratory environment detection monitoring method is characterized by comprising the following steps:
s1: the air blower (14) is started, the air blower (14) rotates to absorb gas in a chemical laboratory, the gas is sucked into the detection box (1) through the gas inlet pipe (11), and harmful gas in the chemical laboratory can be monitored and detected in real time through the gas detector (3);
s2: the fan (14) generates wind power to blow the impact plate (20) in the rotating process, so that the impact plate (20) moves upwards, the impact plate (20) drives the pull rope (5) to move upwards through the connecting rod (19), the second filter screen (16) moves leftwards, and harmful gas in a chemical laboratory can be filtered through the second filter screen (16);
s3: when the conflagration condition appeared in the chemistry experiment room, the temperature risees and makes gasbag (8) begin to expand, gasbag (8) inflation promotion transfer line (9) outside motion offsets tightly with bee calling organ (26), and then make bee calling organ (26) begin to work and warn staff on every side, transfer line (9) outwards spur string (25) simultaneously, thereby make the inside rivers of water pipe (4) flow into shower nozzle (27), the rethread is seted up and is being discharged in spraying hole (28) on shower nozzle (27) inside wall, it puts out a fire to spray water to the conflagration department.
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| CN210803405U (en) * | 2019-09-09 | 2020-06-19 | 广州市盛通建设工程质量检测有限公司 | Indoor environment detection monitoring device |
| CN211855421U (en) * | 2020-03-23 | 2020-11-03 | 无锡环威科技有限公司 | Intelligent laboratory environment monitoring system |
| CN111905314A (en) * | 2020-08-13 | 2020-11-10 | 杭州圣枪科技有限公司 | Family hidden type recyclable fire detection device |
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| CN112781653A (en) | 2021-05-11 |
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