Nitrogen dioxide vapor detection device for silver nitrate preparation and detection method thereof

Abstract

The application discloses a kind of nitrogen dioxide vapor detection devices for silver nitrate preparation and its detection method, the detection device includes reaction kettle, reaction kettle is connected with detection box, detection box is provided with the gas inlet pipe connected with the kettle cavity of reaction kettle, gas inlet pipe is provided with suction assembly at gas inlet, pneumatic check valve is arranged in gas inlet pipe, the detection bottle for containing detection liquid is arranged at the end of detection box away from gas inlet pipe, glass tube connected with gas inlet pipe is arranged in detection bottle, drainage pipe is arranged in the bottom of detection bottle, first plugging component is arranged in drainage pipe, and liquid inlet pipe is connected to the top of detection bottle. The detection device of the application is simple in structure, easy to operate, and low in cost. The nitrogen dioxide content in the reaction kettle can be continuously and quickly detected, the nitrogen dioxide detection efficiency and detection effect are improved, and the silver nitrate preparation efficiency and preparation quality are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of chemical preparation, and particularly relates to a nitrogen dioxide vapor detection device for silver nitrate preparation and a detection method thereof. BACKGROUND

[0002] Currently, the main method for large-scale preparation of silver nitrate is a reaction process of dissolving silver with nitric acid, and then silver nitrate crystals are obtained through evaporation and concentration, crystallization, centrifugation and drying. Nitrogen oxides such as NO2 are generated in the preparation process of silver nitrate, and all the nitrogen dioxide vapor needs to be removed in the subsequent preparation process. The existing equipment generally observes whether there is vapor escaping through the human eye, which inevitably has inaccuracy. Even if a sensor is used for detection, the service life of the sensor is short, the use environment is high, and the price is expensive, which cannot meet the use demand of small and medium-sized enterprises.

[0003] The Chinese invention with the patent number CN202010185450.8 discloses a detection device for nitrogen dioxide and a use method thereof, which comprises a shell, a side wall of the shell is embedded with an air inlet pipe, and an air extraction device is arranged in the air inlet pipe. It can realize the detection of nitrogen dioxide in the air, and the nitrogen dioxide is detected by using the naphthalene ethylenediamine hydrochloride spectrophotometric method. The detection result is more intuitive and accurate, the absorption liquid can be replaced, the device can be repeatedly used, and it has a sufficient service life. However, in the specific operation process of the device, after the air is extracted, the staff needs to manually operate the screw rod to rotate and control the movement of the pressing plate to block the circulation of the air in the silica gel pipe to prevent the solution from being sucked back. Moreover, the detection liquid after the reaction cannot be quickly and automatically replaced, which reduces the continuous detection efficiency of the nitrogen dioxide and further affects the preparation progress of the silver nitrate. SUMMARY

[0004] The present application aims at solving the problems in the prior art, and provides a nitrogen dioxide vapor detection device for silver nitrate preparation and a detection method thereof.

[0005] Technical scheme: The nitrogen dioxide vapor detection device for silver nitrate preparation comprises a detection box connected to and communicating with a reaction kettle, an air inlet pipe connected to the kettle cavity is arranged on the detection box, an air extraction assembly is arranged at the air inlet of the air inlet pipe, a pneumatic check valve is arranged in the air inlet pipe, a detection bottle for containing a detection liquid is arranged at one end of the detection box away from the air inlet pipe, a glass tube connected to the air inlet pipe is arranged in the detection bottle, a liquid discharge pipe is arranged at the bottom of the detection bottle, a first plugging assembly is arranged in the liquid discharge pipe, a liquid inlet pipe is connected to the top of the detection bottle, two liquid supplementing mechanisms identical in structure and connected to the liquid inlet pipe are arranged on the detection box, and a driving mechanism for driving the liquid supplementing mechanism and the first plugging assembly to act is arranged on the detection box.

[0006] Further, the air extraction assembly of the detection device comprises a support fixed at the end of the air inlet pipe, a first motor is arranged on the support, the output end of the first motor penetrates through the support and is connected with a rotating shaft, an air extraction fan blade is arranged on the rotating shaft, the pneumatic one-way valve comprises a fixed block fixed in the air inlet pipe, a tapered port is formed in the fixed block, a tapered plug is movably connected in the tapered port, a first elastic element is arranged on the tapered plug, the end of the first elastic element away from the tapered plug is connected with a connecting ring, and the connecting ring is arranged outside the rotating shaft.

[0007] Further, the inner wall of the air inlet pipe of the detection device is connected with a shell through a connecting rod, the first bevel gear and the second bevel gear are movably connected in the shell and are in engagement with each other, the first bevel gear is connected with the rotating shaft, the second bevel gear is connected with a T-shaped connecting rod, the connecting rod is connected with a connecting rod, and the connecting rod is uniformly provided with stirring rods.

[0008] Further, the liquid supplementing mechanism of the detection device comprises a support plate fixed on the detection box, the end of the support plate away from the detection box is connected with a liquid storage tank, the liquid storage tanks of the two liquid supplementing mechanisms are respectively used for storing detection liquid and clean water, the bottom of each liquid storage tank is connected with a liquid supplementing pipe, the second plugging assembly is arranged in the liquid supplementing pipe, and the end of the liquid supplementing pipe away from the liquid storage tank is connected with a liquid inlet pipe.

[0009] Further, the driving mechanism of the detection device comprises a second motor fixed in the detection box, the output end of the second motor is connected with a first gear, the outer side of the first gear is in engagement with a second gear, the second gear is connected with a rotating ring rotatably arranged outside the liquid inlet pipe, the rotating ring is connected with a straight rod, the end of the straight rod away from the rotating ring is connected with a moving block, and the moving block is provided with a pressing inclined surface.

[0010] Further, the first plugging assembly of the detection device comprises a containing groove formed in the detection box, a stress block is slidably connected in the containing groove, the second elastic element is arranged between the stress block and the inner wall of the containing groove, a gas bag movably abuts against the stress block is further arranged in the containing groove, the gas bag is connected with a pneumatic telescopic rod through an air pipe, the pneumatic telescopic rod is arranged at the bottom of the detection box, the first plugging assembly further comprises a first plugging block slidably connected in the liquid outlet pipe, the bottom of the first plugging block is connected with a first connecting rod, and the connecting plate is connected between the telescopic end of the pneumatic telescopic rod and the first connecting rod.

[0011] Furthermore, the second sealing component of the detection device includes a second connecting rod slidably connected inside the replenishment tube, a second sealing block slidably disposed inside the replenishment tube connected to the second connecting rod, one end of the second connecting rod away from the second sealing block moving against the moving block, a fixing plate connected to the rod body of the second connecting rod placed outside the replenishment tube, and a third elastic element disposed between the fixing plate and the replenishment tube.

[0012] Furthermore, the drain pipe and replenishment pipe of the detection device are both composed of a conducting section and a blocking section connected together. The outer wall of the first blocking block is in contact with the inner wall of the drain pipe blocking section, and the second blocking block is in contact with the inner wall of the replenishment pipe blocking section.

[0013] The present invention uses the above-mentioned detection device for detection, comprising the following steps:

[0014] (1) Silver and nitric acid are poured into the reaction vessel to produce nitrogen dioxide. After the reaction is completed, the steam valve on the reaction vessel is opened to heat and remove the nitrogen dioxide.

[0015] (2) Operate the air extraction component on the air inlet pipe to extract the air in the reactor. After extraction is complete, close the pneumatic check valve and perform a test.

[0016] (3) When nitrogen dioxide is detected in the reactor, the drive mechanism is controlled to work, so that the drive mechanism drives the first sealing component and the second sealing component to work together to rinse the test bottle that has been used with the test liquid until there is no more nitrogen dioxide in the reactor.

[0017] Beneficial effects: Compared with the prior art, the significant advantages of the present invention are:

[0018] 1. The nitrogen dioxide vapor detection device for silver nitrate preparation drives the first and second sealing components through a drive mechanism, which can automatically replace the detection liquid in the detection bottle and automatically clean the residual detection liquid in the detection bottle, thereby achieving continuous and rapid detection of nitrogen dioxide content in the reaction vessel, improving the detection efficiency and effect of nitrogen dioxide, and thus ensuring the efficiency and quality of silver nitrate preparation.

[0019] 2. The nitrogen dioxide vapor detection device for silver nitrate preparation uses a ventilation assembly to rotate a rotating shaft. The rotating shaft drives a first bevel gear to mesh with a second bevel gear on a T-shaped connecting rod, which in turn drives a connecting rod to rotate inside the detection bottle. This causes the stirring rod to mix the extracted air and the detection liquid, accelerating the gas-liquid mixing rate and thus improving the detection efficiency of nitrogen dioxide in the air.

[0020] 3. The nitrogen dioxide vapor detection device for silver nitrate preparation uses an exhaust assembly to draw air from the reactor through the inlet pipe. The drawn air exerts force on the pneumatic check valve, causing it to open. When the exhaust assembly stops operating, the pneumatic check valve automatically closes, effectively blocking the flow of air in the inlet pipe and preventing backflow of the solution. The entire device is simple in structure, low in cost, highly stable, and reusable. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is a cross-sectional structural diagram of the detection box of the present invention;

[0023] Figure 3 This is a cross-sectional structural diagram of the intake pipe of the present invention;

[0024] Figure 4 This is a schematic diagram of the fluid replenishment mechanism of the present invention;

[0025] Figure 5 For the present invention Figure 2 A partially enlarged structural diagram of section A in the middle;

[0026] Figure 6 For the present invention Figure 2 A partially enlarged structural diagram of section B in the middle;

[0027] Figure 7 This is a cross-sectional structural diagram of the pneumatic telescopic rod of the present invention.

[0028] In the diagram: 1. Reactor; 2. Detection box; 201. Support plate; 3. Inlet pipe; 301. Bracket; 4. Pneumatic check valve; 401. Fixing block; 402. Conical inlet; 403. Conical plug; 404. First elastic element; 405. Connecting ring; 5. Detection bottle; 6. Glass tube; 7. Drain pipe; 8. Inlet pipe; 9. First motor; 901. Rotating shaft; 902. Exhaust fan blade; 10. Housing; 1001. First bevel gear; 1002. Second bevel gear; 11. T-shaped connecting rod; 111. Connecting rod. 112. Stirring rod; 12. Liquid storage tank; 13. Liquid replenishment pipe; 14. Second motor; 141. First gear; 15. Rotating ring; 151. Second gear; 152. Straight rod; 153. Moving block; 16. Receiving tank; 161. Force-bearing block; 162. Second elastic element; 163. Airbag; 164. Pneumatic telescopic rod; 17. First sealing block; 171. First connecting rod; 172. Connecting plate; 18. Second connecting rod; 181. Second sealing block; 182. Fixing plate; 183. Third elastic element. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0030] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 The nitrogen dioxide vapor detection device for silver nitrate preparation of the present invention includes a reaction vessel 1, a detection box 2 connected to the outside of the reaction vessel 1, an air inlet pipe 3 connected to the cavity of the reaction vessel 1 on the detection box 2, an air extraction component at the air inlet of the air inlet pipe 3, a pneumatic one-way valve 4 inside the air inlet pipe 3, a detection bottle 5 for holding the detection liquid at the end of the detection box 2 away from the air inlet pipe 3, a glass tube 6 connected to the air inlet pipe 3 inside the detection bottle 5, a drain pipe 7 at the bottom of the detection bottle 5, a first sealing component inside the drain pipe 7, an inlet pipe 8 connected to the top of the detection bottle 5, two identical liquid replenishment mechanisms connected to the inlet pipe 8 on the detection box 2, and a drive mechanism for driving the liquid replenishment mechanism and the first sealing component on the detection box 2.

[0031] Specifically, after silver and nitric acid are poured into reactor 1, they react to produce nitrogen dioxide. After the reaction is complete, the steam valve on reactor 1 is opened to heat and expel the nitrogen dioxide. The operator observes whether any steam escapes from reactor 1. When no steam is seen escaping, the system controls the air extraction component on the air inlet pipe 3 to run for a period of time, causing the air inlet pipe 3 to extract air from reactor 1. This air automatically passes through the pneumatic one-way valve 4 and enters the detection bottle 5. After the air extraction is complete, the pneumatic one-way valve 4 automatically closes to block the airflow in the air inlet pipe 3, preventing backflow of the solution. The nitrogen dioxide in the air is detected by the detection liquid in the detection bottle 5. After the detection is completed, the detection liquid in the detection bottle 5 needs to be replaced. The drive mechanism drives the first sealing component and the liquid replenishment mechanism to automatically replace the detection liquid in the detection bottle 5 and automatically clean any residual detection liquid in the detection bottle 5. This enables continuous and rapid detection of the nitrogen dioxide content in reactor 1, improving the efficiency and effectiveness of nitrogen dioxide detection, and thus ensuring the efficiency and quality of silver nitrate preparation.

[0032] Reference Figure 2 and Figure 3The air extraction assembly includes a bracket 301 fixed at the end of the air inlet pipe 3. A first motor 9 is mounted on the bracket 301. The output end of the first motor 9 passes through the bracket 301 and is connected to a rotating shaft 901. An exhaust fan blade 902 is mounted on the rotating shaft 901. The pneumatic one-way valve 4 includes a fixing block 401 fixed inside the air inlet pipe 3. A conical opening 402 is provided on the fixing block 401. A conical plug 403 is movably connected inside the conical opening 402. A first elastic element 404 is provided on the conical plug 403. A connecting ring 405 is connected to the end of the first elastic element 404 away from the conical plug 403. The connecting ring 405 is located outside the rotating shaft 901.

[0033] Specifically, by controlling the operation of the first motor 9, the output end of the first motor 9 drives the rotating shaft 901 to rotate. The rotating shaft 901 drives the exhaust fan blade 902 to rotate, extracting gas from the reactor 1. The extracted air exerts force on the conical plug 403 in the pneumatic one-way valve 4, causing the pneumatic one-way valve 4 to open, and the gas is sent into the test bottle 5. When the exhaust assembly is no longer running, the first elastic element 404 pushes the conical plug 403 to block the conical opening 402, and the pneumatic one-way valve 4 automatically closes, effectively blocking the flow of air in the air inlet pipe 3 and preventing the solution from being drawn back. The entire device is simple in structure, low in cost, highly stable, and reusable.

[0034] Reference Figure 2 and Figure 3 The inner wall of the intake pipe 3 is connected to the housing 10 via a connecting rod. The housing 10 contains a first bevel gear 1001 and a second bevel gear 1002 that mesh with each other. The first bevel gear 1001 is connected to the rotating shaft 901. The second bevel gear 1002 is connected to a T-shaped connecting rod 11. A connecting rod 111 is connected to the T-shaped connecting rod 11. A stirring rod 112 is evenly distributed on the connecting rod 111.

[0035] Specifically, when the exhaust assembly is running, the rotating shaft 901 rotates, and the rotating shaft 901 drives the first bevel gear 1001 to mesh with the second bevel gear 1002 on the T-shaped connecting rod 11. This causes the T-shaped connecting rod 111 to rotate inside the detection bottle 5, and the stirring rod 112 to stir and mix the extracted air and detection liquid, thereby accelerating the gas-liquid mixing rate and improving the detection efficiency of nitrogen dioxide in the air.

[0036] Reference Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7The replenishment mechanism includes a support plate 201 fixed on the detection box 2. The end of the support plate 201 away from the detection box 2 is connected to a liquid storage tank 12. The liquid storage tanks 12 of the two replenishment mechanisms are used to store detection liquid and clean water, respectively. The bottom of each liquid storage tank 12 is connected to a replenishment pipe 13. A second sealing component is provided in the replenishment pipe 13. The end of the replenishment pipe 13 away from the liquid storage tank 12 is connected to the liquid inlet pipe 8.

[0037] The drive mechanism includes a second motor 14 fixed inside the detection box 2. The output end of the second motor 14 is connected to a first gear 141. A second gear 151 is meshed with the outer side of the first gear 141. A rotating ring 15 is rotatably disposed on the outer side of the liquid inlet pipe 8 and connected to the second gear 151. A straight rod 152 is connected to the rotating ring 15. A moving block 153 is connected to the end of the straight rod 152 away from the rotating ring 15. A squeezing inclined surface is provided on the moving block 153.

[0038] The first sealing assembly includes a receiving groove 16 formed on the detection box 2. A force-bearing block 161 is slidably connected in the receiving groove 16. A second elastic element 162 is provided between the force-bearing block 161 and the inner wall of the receiving groove 16. An airbag 163 is also provided in the receiving groove 16 to move against the force-bearing block 161. The airbag 163 is connected to a pneumatic telescopic rod 164 through an air pipe. The pneumatic telescopic rod 164 is located at the bottom of the detection box 2. The first sealing assembly also includes a first sealing block 17 slidably connected in the drain pipe 7. A first connecting rod 171 is connected to the bottom of the first sealing block 17. A connecting plate 172 is connected between the first connecting rod 171 and the telescopic end of the pneumatic telescopic rod 164.

[0039] The second sealing assembly includes a second connecting rod 18 slidably connected inside the replenishment tube 13. A second sealing block 181 is slidably disposed inside the replenishment tube 13 and connected to the second connecting rod 18. One end of the second connecting rod 18 away from the second sealing block 181 is movably abutted against the moving block 153. A fixing plate 182 is connected to the rod body of the second connecting rod 18 located outside the replenishment tube 13. A third elastic element 183 is disposed between the fixing plate 182 and the replenishment tube 13.

[0040] Both the drain pipe 7 and the replenishment pipe 13 are composed of a conducting section and a blocking section. The outer wall of the first blocking block 17 is in contact with the inner wall of the blocking section of the drain pipe 7, and the second blocking block 181 is in contact with the inner wall of the blocking section of the replenishment pipe 13.

[0041] Specifically, when nitrogen dioxide is detected in the test solution in test bottle 5, the test solution needs to be replaced for subsequent use. By controlling the operation of the second motor 14, the output of the second motor 14 drives the first gear 141 to rotate. The first gear 141 meshes with the second gear 151 on the outer side of the rotating ring 15, causing the second gear 151 to drive the rotating ring 15 to rotate. The rotating ring 15 drives the moving block 153 to rotate via the straight rod 152. During this process, the moving block 153 first abuts against the force-bearing block 161. An inclined plane is provided between the force-bearing block 161 and the force-bearing block 161. After the force-bearing block 161 moves downward under force, it squeezes the airbag 163. The air in the airbag 163 enters the pneumatic telescopic rod 164 through the air tube. The pneumatic telescopic rod 164 is stretched under force. The telescopic end of the pneumatic telescopic rod 164 drives the connecting plate 172 to move downward. The connecting plate 172 drives the first sealing block 17 to move downward through the first connecting rod 171. The first sealing block 17 is no longer in contact with the inner wall of the sealing section of the drain pipe 7. At this time, the used test liquid in the test bottle 5 can be discharged along the drain pipe 7. Figure 2 For example, as the moving block 153 continues to rotate, based on the pressure of the moving block 153 against the force-bearing block 161, the moving block 153 begins to exert force on the second connecting rod 18 of the right-side replenishment mechanism. The liquid storage tank 12 of the right-side replenishment mechanism contains clean water. The second connecting rod 18 in the right-side replenishment mechanism is moved upward under force, so that the second sealing block 181 at the top of the second connecting rod 18 no longer adheres to the inner wall of the sealing section of the replenishment pipe 13. At this time, the clean water stored in the right-side liquid storage tank 12 enters the test bottle 5 along the right-side replenishment pipe 13 and the inlet pipe 8 to rinse the residual test liquid in the test bottle 5, so as to avoid liquid residue affecting the accuracy of the subsequent nitrogen dioxide test results. As the moving block 153 continues to rotate, the moving block 153 no longer presses against the right-side second connecting rod 18. The right-side second connecting rod 18 is reset under the elastic force of the third elastic element 183. The right-side second sealing block 181 seals the replenishment pipe 13 containing clean water, and the moving block 153 no longer exerts force on the force-bearing block 161. Block 161 presses against the pressure, and under the elastic force of the second elastic element 162, the pressure block 161 resets, and the compressed air in the airbag 163 returns, causing the pneumatic telescopic rod 164 to reset and drive the first sealing block 17 to seal the drain pipe 7. As the moving block 153 continues to rotate, the moving block 153 begins to press against the second connecting rod 18 on the left. The second connecting rod 18 on the left drives the second sealing block 181 to move upward, so that the detection liquid stored in the left storage tank 12 enters the inlet pipe 8 through the left replenishment pipe 13 and finally enters the detection bottle 5, realizing the automatic replacement of the detection liquid in the detection bottle 5. As the liquid level of the detection liquid gradually rises but does not exceed the height of the glass tube 6, the moving block 153 no longer presses against the second connecting rod 18 on the left, and the left storage tank 12 no longer replenishes the detection liquid into the detection bottle 5, thereby realizing continuous and rapid detection of nitrogen dioxide content in the reactor 1, improving the detection efficiency and detection effect of nitrogen dioxide, and thus ensuring the preparation efficiency and preparation quality of silver nitrate.

[0042] Reference Figure 2 The test solution is prepared from 20% anhydrous acetic acid, 10% p-aminobenzenesulfonic acid, and 70% naphthylethylenediamine hydrochloride. Specifically, if nitrogen dioxide is present in the extracted air, nitrous acid reacts with p-aminobenzenesulfonic acid in the presence of anhydrous acetic acid, and then couples with naphthylethylenediamine hydrochloride to generate a rose-red azo dye. The color intensity is directly proportional to the nitrogen dioxide concentration in the gas sample. The color intensity is determined by spectrophotometry. Staff can observe the color of the test solution by opening an observation window on the test chamber 2.

[0043] The present invention uses the above-mentioned detection device for detection, comprising the following steps:

[0044] (1) Silver and nitric acid are poured into reactor 1 and react to generate nitrogen dioxide. After the reaction is completed, the steam valve on reactor 1 is opened to heat and remove the nitrogen dioxide.

[0045] (2) The staff observes whether there is steam escaping from the reactor 1. When no steam is seen escaping, the background controls the air extraction component on the air inlet pipe 3 to run for a period of time, so that the air inlet pipe 3 extracts the air in the reactor 1. The air automatically passes through the pneumatic one-way valve 4 and enters the test bottle 5. When the air extraction is completed, the pneumatic one-way valve 4 automatically closes to block the air flow in the air inlet pipe 3 and prevents the solution from being drawn back.

[0046] (3) If there is no nitrogen dioxide in the air, the air and the detection liquid will not react, and the reaction vessel 1 will continue the subsequent preparation steps; if there is nitrogen dioxide in the air, in the presence of anhydrous acetic acid, nitrous acid and p-aminobenzenesulfonic acid will undergo a diazotization reaction, and then couple with naphthylethylenediamine hydrochloride to generate a rose-red azo dye. The color intensity is proportional to the nitrogen dioxide concentration in the gas sample. The color intensity is determined by spectrophotometry.

[0047] (4) When nitrogen dioxide is detected in the reactor 1, the staff controls the drive mechanism to work, so that the drive mechanism drives the first sealing component and the second sealing component to work together. The first sealing component no longer blocks the drain pipe 7, and the test liquid in the test bottle 5 is discharged from the drain pipe 7. The second sealing component, which stores clean water in the two replenishment mechanisms, works first, so that clean water enters the test bottle 5 from the replenishment pipe 13 and the inlet pipe 8 to rinse the test bottle 5 that has used the test liquid before. At this time, the first sealing component has not yet blocked the drain pipe 7, so that the clean water is automatically discharged after rinsing the test bottle 5. Then the second sealing component, which stores clean water, blocks the replenishment pipe 13 on this side, so that the clean water no longer flows down, and the first sealing component blocks the drain pipe 7. The replenishment mechanism on the other side, which stores the test liquid, starts to work, so that the test liquid enters the test bottle 5 through the replenishment pipe 13 and the inlet pipe 8 on this side, in preparation for the subsequent re-testing of the nitrogen dioxide content in the reactor 1, until the reactor 1 no longer contains nitrogen dioxide.

[0048] (5) After the nitrogen dioxide is discharged from reactor 1, the subsequent preparation steps are continued. The reactants are concentrated by evaporation, crystallization, centrifugation and drying to obtain silver nitrate crystals.

Claims

1. A nitrogen dioxide vapor detection device for silver nitrate preparation, characterized in that: The detection device includes a detection box (2) externally connected to and communicating with the reaction vessel (1). The detection box (2) is provided with an air inlet pipe (3) connected to the cavity of the reaction vessel (1). An air extraction component is provided at the air inlet of the air inlet pipe (3). A pneumatic one-way valve (4) is provided inside the air inlet pipe (3). A detection bottle (5) for holding the detection liquid is provided at one end of the detection box (2) away from the air inlet pipe (3). A glass tube (6) connected to the air inlet pipe (3) is provided inside the detection bottle (5). A drain pipe (7) is provided at the bottom of the detection bottle (5). A first sealing component is provided inside the drain pipe (7). An inlet pipe (8) is connected to the top of the detection bottle (5). Two liquid replenishment mechanisms with the same structure and connected to the inlet pipe (8) are provided on the detection box (2). A drive mechanism for driving the liquid replenishment mechanism and the first sealing component is provided on the detection box (2). The air extraction assembly includes a bracket (301) fixed at the end of the air inlet pipe (3), a first motor (9) is provided on the bracket (301), the output end of the first motor (9) passes through the bracket (301) and is connected to a rotating shaft (901), an exhaust fan blade (902) is provided on the rotating shaft (901), and the pneumatic one-way valve (4) includes a fixing block (401) fixed inside the air inlet pipe (3), a conical opening (402) is provided on the fixing block (401), a conical plug (403) is movably connected inside the conical opening (402), a first elastic element (404) is provided on the conical plug (403), a connecting ring (405) is connected to the end of the first elastic element (404) away from the conical plug (403), and the connecting ring (405) is located outside the rotating shaft (901); The driving mechanism includes a second motor (14) fixed inside the detection box (2). The output end of the second motor (14) is connected to a first gear (141). A second gear (151) is meshed with the outer side of the first gear (141). A rotating ring (15) is rotatably disposed on the outer side of the liquid inlet pipe (8) connected to the second gear (151). A straight rod (152) is connected to the rotating ring (15). A moving block (153) is connected to the end of the straight rod (152) away from the rotating ring (15). An extrusion slope is provided on the moving block (153).

2. The nitrogen dioxide vapor detection device for silver nitrate preparation according to claim 1, characterized in that: The inner wall of the air intake pipe (3) is connected to a housing (10) via a connecting rod. A first bevel gear (1001) and a second bevel gear (1002) are rotatably connected inside the housing (10). The first bevel gear (1001) is connected to a rotating shaft (901). The second bevel gear (1002) is connected to a T-shaped connecting rod (11). A connecting rod (111) is connected to the T-shaped connecting rod (11). A stirring rod (112) is evenly distributed on the connecting rod (111).

3. The nitrogen dioxide vapor detection device for silver nitrate preparation according to claim 1, characterized in that: The replenishment mechanism includes a support plate (201) fixed on the detection box (2). The end of the support plate (201) away from the detection box (2) is connected to a storage tank (12). The storage tanks (12) of the two replenishment mechanisms are used to store detection liquid and clean water, respectively. The bottom of each storage tank (12) is connected to a replenishment pipe (13). A second sealing component is provided in the replenishment pipe (13). The end of the replenishment pipe (13) away from the storage tank (12) is connected to the inlet pipe (8).

4. The nitrogen dioxide vapor detection device for silver nitrate preparation according to claim 3, characterized in that: The first sealing assembly includes a receiving groove (16) opened on the detection box (2), a force-bearing block (161) is slidably connected in the receiving groove (16), a second elastic element (162) is provided between the force-bearing block (161) and the inner wall of the receiving groove (16), an airbag (163) is also provided in the receiving groove (16) to move against the force-bearing block (161), the airbag (163) is connected to a pneumatic telescopic rod (164) through an air pipe, the pneumatic telescopic rod (164) is set at the bottom of the detection box (2), the first sealing assembly also includes a first sealing block (17) slidably connected in the drain pipe (7), a first connecting rod (171) is connected to the bottom of the first sealing block (17), and a connecting plate (172) is connected between the first connecting rod (171) and the telescopic end of the pneumatic telescopic rod (164).

5. The nitrogen dioxide vapor detection device for silver nitrate preparation according to claim 4, characterized in that: The second sealing assembly includes a second connecting rod (18) slidably connected inside the replenishment tube (13). A second sealing block (181) is slidably disposed inside the replenishment tube (13) on the second connecting rod (18). One end of the second connecting rod (18) away from the second sealing block (181) is movably abutted against the moving block (153). A fixing plate (182) is connected to the rod body of the second connecting rod (18) located outside the replenishment tube (13). A third elastic element (183) is disposed between the fixing plate (182) and the replenishment tube (13).

6. The nitrogen dioxide vapor detection device for silver nitrate preparation according to claim 5, characterized in that: Both the drain pipe (7) and the replenishment pipe (13) are connected by a conducting section and a blocking section. The outer wall of the first blocking block (17) is in contact with the inner wall of the blocking section of the drain pipe (7), and the second blocking block (181) is in contact with the inner wall of the blocking section of the replenishment pipe (13).

7. A method for detection using the detection device according to claim 1, characterized in that: Includes the following steps: (1) Silver and nitric acid are poured into the reaction vessel (1) and react to produce nitrogen dioxide. After the reaction is completed, the steam valve on the reaction vessel (1) is opened to heat and remove the nitrogen dioxide. (2) Run the air extraction assembly on the air inlet pipe (3) to extract the air in the reactor (1). After the extraction is completed, close the pneumatic check valve (4) and perform a test. (3) When nitrogen dioxide is detected in the reactor (1), the drive mechanism is controlled to work, so that the drive mechanism drives the first sealing component and the second sealing component to work together to rinse the test bottle (5) that has been used with the test liquid until there is no more nitrogen dioxide in the reactor (1).

Images