Ventilation equipment for chemical experiment

Abstract

The invention relates to the technical field of ventilation equipment, and discloses chemical experiment ventilation equipment which comprises a chemical laboratory, an experiment operation table is arranged in the chemical laboratory, a ventilation pipe is fixedly installed on the right side wall of the chemical laboratory, a ventilation fan is fixedly installed in the ventilation pipe, and an exhaust guide pipe is fixed to the top end in the chemical laboratory. An exhaust nozzle is arranged above the experiment operation table, a lengthening pipe is fixed to the upper side of the exhaust nozzle, an electromagnetic valve is installed on the lengthening pipe, the lengthening pipe is connected with an exhaust guide pipe through a corrugated hose, an adapter frame is fixed to the outer side of the lengthening pipe, and a height adjusting mechanism is installed at the top end in the chemical laboratory; and a peculiar smell adsorption mechanism connected with the extension pipe is mounted in the transfer frame. The ventilation effect is good, pungent smell can be adsorbed, and pollution to outside air is reduced; the height of the exhaust nozzle is convenient to adjust, so that the exhaust nozzle is closer to a peculiar smell gas source, and the peculiar smell absorption and exhaust effects are better; and ash removal is convenient.

Description

Technical Field

[0001] The invention relates to the technical field of ventilation equipment, in particular to chemical experiment ventilation equipment. Background Art

[0002] The so-called chemical laboratory refers to an important place that provides chemical experimental conditions and conducts scientific research. It contains a large number of instruments: iron stands, asbestos nets, alcohol lamps and other experimental tools. At present, chemical laboratories are mainly used for teaching and scientific research. Because chemical chemicals and substances that are irritating to the skin can easily cause harm to workers during chemical experiments, safety protection should be paid attention to during chemical experiments. In addition to the damage of chemical reagents to the human body, many chemical reagents will produce toxic and harmful gases during the reaction, so chemical laboratories also need to be equipped with complete ventilation equipment.

[0003] When used, the existing chemical experiment ventilation equipment directly discharges the harmful gases in the laboratory into the outside air. Although it can improve the environment inside the laboratory, it will pollute the outside air. In addition, the installation height of the exhaust nozzle of the existing ventilation equipment is fixed and cannot be adjusted according to demand. When odor is generated in the laboratory, the exhaust nozzle cannot be adjusted to make it closer to the odor source to improve the absorption and exhaust effect of the odor. Therefore, in view of the above situation, it is urgent to develop a chemical experiment ventilation equipment with good ventilation effect, which can adsorb irritating odors and reduce pollution to the outside air, and the height of the exhaust nozzle can be easily adjusted so that the exhaust nozzle can be closer to the odor source, so as to achieve better absorption and exhaust effect of the odor, so as to overcome the shortcomings in current practical applications and meet current needs. Summary of the invention

[0004] The object of the present invention is to provide chemical experiment ventilation equipment to solve the problems raised in the above background technology.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] Chemical experiment ventilation equipment, including a chemical laboratory, an experimental operation table, a ventilation pipe, a dust filter, a ventilation fan, an exhaust duct, an exhaust nozzle, an adapter frame, a limit guide rod, a height adjustment mechanism, an odor adsorption mechanism, a corrugated hose and a limit mechanism, wherein an experimental operation table is arranged in the chemical laboratory, a ventilation pipe is fixedly installed on the right side wall of the chemical laboratory, a ventilation fan is fixedly installed in the ventilation pipe, a dust filter is fixedly installed on the right end of the ventilation pipe, the exhaust duct is fixed to the inner top of the chemical laboratory, an exhaust nozzle is arranged above the experimental operation table, an extension pipe is fixed on the upper side of the exhaust nozzle, a solenoid valve is installed on the extension pipe, the extension pipe is connected to the exhaust duct through a corrugated hose, and an adapter is fixed on the outer side of the extension pipe The rack is provided with a height adjustment mechanism at the top of the interior of the chemical laboratory, and the height adjustment mechanism is used to drive the adapter rack, the extension tube and the exhaust nozzle to move up and down; an odor adsorption mechanism connected to the extension tube is installed in the adapter rack, and the odor adsorption mechanism comprises: an air pump, an air inlet pipe, a filter box, an air supply pipe, a storage net box, a push-pull handle and an air outlet pipe; the air pump and the filter box are both fixedly installed in the adapter rack, the air inlet of the air pump is connected to the air inlet pipe inserted into the extension tube, the air outlet of the air pump is connected to the air supply pipe inserted into the filter box, the air outlet pipe inserted into the extension tube is installed on the right side of the filter box, a storage net box is slidably installed in the filter box, the storage net box is filled with activated carbon, and a push-pull handle is fixed on the front side of the storage net box.

[0007] Preferably, the connection between the air inlet pipe and the extension pipe is located below the solenoid valve, and the connection between the air outlet pipe and the extension pipe is located above the solenoid valve.

[0008] Preferably, the left end outlet of the exhaust duct extends to the outside of the chemical laboratory.

[0009] Preferably: a limit slider is fixed on both sides of the adapter frame, two limit guide rods are fixed on the inner top of the chemical laboratory, each of the limit guide rods passes through a limit slider, and the limit slider is in sliding contact with the limit guide rod.

[0010] Preferably, a stopper is fixed at the bottom of each of the limit guide rods.

[0011] Preferably: an automatic dust cleaning device is installed in the ventilation duct, and the automatic dust cleaning device is used to clean the dust filter.

[0012] Preferably: the automatic dust cleaning device includes: a first motor, a first gear, a second gear, a transmission shaft and a cleaning brush, the first motor is fixed inside the ventilation duct, the first motor has a first gear fixedly mounted on its output shaft, a second gear meshing with the first gear is provided on one side of the first gear, the second gear is fixedly mounted on the transmission shaft, the transmission shaft is rotatably connected to the ventilation duct, and the transmission shaft is fixed to the cleaning brush.

[0013] Preferably: the height adjustment mechanism comprises: a bearing seat, a drive shaft, a second motor, a winding wheel and a steel wire rope, two bearing seats are fixedly installed on the inner top of the chemical laboratory, a drive shaft is rotatably connected between the two bearing seats, two winding wheels are fixedly installed on the drive shaft, a steel wire rope is wound around each winding wheel, the upper end of the steel wire rope is fixed to the winding wheel, the lower end of the steel wire rope is fixed to the adapter frame, the second motor is fixedly installed on the inner top of the chemical laboratory, and the output shaft of the second motor is fixed to the drive shaft.

[0014] Preferably, two limiting mechanisms for blocking the storage net box are installed on the filter box.

[0015] Preferably: the limiting mechanism includes: an adapter block, a shielding rod and a spring, the adapter block is fixed to the filter box, a shielding rod is slidably installed on the adapter block, the shielding rod is located at the front side of the storage net box to block it, a spring is installed on the outer side of the lower half of the shielding rod, the upper end of the spring is fixed to the adapter block and the lower end is fixed to the shielding rod.

[0016] The beneficial effects of the present invention are:

[0017] 1. When the chemical experiment ventilation equipment is used normally, the solenoid valve is opened, and air is blown into the chemical laboratory through the ventilation fan. The outside air passes through the dust filter and enters the chemical laboratory. The dust in the air flow is filtered out by the dust filter. The air in the chemical laboratory enters from the exhaust nozzle and is discharged outside the chemical laboratory along the extension pipe, corrugated hose and exhaust duct, thereby realizing the air flow in the chemical laboratory;

[0018] 2. When there is a lot of irritating odor in the chemical laboratory, close the solenoid valve and open the vacuum pump. The vacuum pump sucks the air in the chemical laboratory. The vacuum pump transports the air to the filter box. The activated carbon in the filter box absorbs the irritating odor in the air. The adsorbed air enters the extension pipe again from the outlet pipe, and then the airflow is discharged outside the chemical laboratory along the corrugated hose and the exhaust duct, thereby reducing the pollution to the outside air;

[0019] 3. The second motor drives the driving shaft to rotate, the driving shaft drives the winding wheel to rotate, the winding wheel drives the wire rope to extend and retract, the wire rope drives the adapter to move up and down, and the adapter drives the exhaust nozzle to move up and down, so that the exhaust nozzle is closer to the odor source, so that the exhaust nozzle has a better absorption effect on the odor;

[0020] 4. After using for a period of time, the first motor drives the first gear to rotate, the first gear drives the second gear to rotate, the second gear drives the transmission shaft to rotate, the transmission shaft drives the cleaning brush to rotate, and the cleaning brush rotates to clean the dust accumulated on the dust filter;

[0021] In summary, the present invention has good ventilation effect, and can absorb irritating odors to reduce pollution to the outside air; the height of the exhaust nozzle can be easily adjusted so that the exhaust nozzle can be closer to the odor source, thereby achieving better absorption and discharge effect of the odor; and dust cleaning is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The three-dimensional structure of the present invention is shown in FIG. Figure 1 .

[0023] Figure 2 The three-dimensional structure of the present invention is shown in FIG. Figure 2 .

[0024] Figure 3 It is a partial structural diagram of the present invention. Figure 1 .

[0025] Figure 4 For the present invention Figure 3 Schematic diagram of the cleaning status.

[0026] Figure 5 For the present invention Figure 3 Internal cross-sectional view of .

[0027] Figure 6 It is a partial structural diagram of the present invention. Figure 2 .

[0028] Figure 7 It is a partial structural diagram of the present invention. Figure 3 .

[0029] Figure 8 It is a partial structural diagram of the present invention. Figure 4 .

[0030] Fig. 9 It is a partial structural diagram of the present invention. Figure 5 .

[0031] Fig.10 For the present invention Fig. 9Schematic diagram of the open state.

[0032] Fig.11 For the present invention Fig. 9 Partial view at point A in the middle.

[0033] Legend:

[0034] 1. Chemical laboratory; 2. Experimental operation table; 3. Ventilation duct; 4. Dust filter; 5. Automatic dust cleaning device; 501. First motor; 502. First gear; 503. Second gear; 504. Transmission shaft; 505. Cleaning brush; 6. Ventilation fan; 7. Exhaust duct; 8. Exhaust nozzle; 801. Extension pipe; 802. Solenoid valve; 9. Adapter frame; 901. Limiting slider; 10. Limiting guide rod; 1001. In-place baffle; 11. Height adjustment mechanism; 1 101. bearing seat; 1102. driving shaft; 1103. second motor; 1104. winding wheel; 1105. wire rope; 12. odor adsorption mechanism; 1201. vacuum pump; 1202. air inlet pipe; 1203. filter box; 1204. air supply pipe; 1205. storage net box; 1206. push-pull handle; 1207. air outlet pipe; 13. corrugated hose; 14. limiting mechanism; 1401. adapter block; 1402. shielding rod; 1403. spring. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Specific examples are given below.

[0037] See also Figures 1 to 11In the embodiment of the present invention, the chemical experiment ventilation equipment includes a chemical laboratory 1, an experimental operating table 2, a ventilation pipe 3, a dust filter 4, an automatic dust cleaning device 5, a ventilation fan 6, an exhaust duct 7, an exhaust nozzle 8, an adapter frame 9, a limiting guide rod 10, a height adjustment mechanism 11, an odor adsorption mechanism 12, a corrugated hose 13 and a limiting mechanism 14. The chemical laboratory 1 is provided with an experimental operating table 2, and people do chemical experiments on the experimental operating table 2. The ventilation pipe 3 is fixedly installed on the right side wall of the chemical laboratory 1, and the ventilation fan 6 is fixedly installed in the ventilation pipe 3. Air is blown into the chemical laboratory 1 through the ventilation fan 6. The right end of the ventilation pipe 3 is fixedly installed with a dust filter 4, and the ventilation pipe 3 is installed with an automatic dust cleaning device 5. The automatic dust cleaning device 5 is used to clean The dust filter 4 is provided, the exhaust duct 7 is fixed at the internal top of the chemical laboratory 1, the left end outlet of the exhaust duct 7 extends to the outside of the chemical laboratory 1, an exhaust nozzle 8 is arranged above the experimental operation table 2, an extension pipe 801 is fixed on the upper side of the exhaust nozzle 8, a solenoid valve 802 is installed on the extension pipe 801, the extension pipe 801 is connected to the exhaust duct 7 through a corrugated hose 13, an adapter frame 9 is fixed on the outside of the extension pipe 801, a limit slider 901 is fixed on the left and right sides of the adapter frame 9, two limit guide rods 10 are fixed on the internal top of the chemical laboratory 1, each limit guide rod 10 passes through a limit slider 901, the limit slider 901 is in sliding contact with the limit guide rod 10, and the limit guide rod 10 and the limit slider 901 are in sliding contact with each other. The restriction makes the adapter frame 9 only move up and down in a straight line. A stopper 1001 is fixed at the bottom of each limit guide rod 10. The stopper 1001 is set to prevent the limit slider 901 from falling off the limit guide rod 10. A height adjustment mechanism 11 is installed at the top of the interior of the chemical laboratory 1. The height adjustment mechanism 11 is used to drive the adapter frame 9, the extension tube 801 and the exhaust nozzle 8 to move up and down, so as to adjust the distance between the exhaust nozzle 8 and the experimental operation table 2. An odor adsorption mechanism 12 connected to the extension tube 801 is installed in the adapter frame 9. The odor adsorption mechanism 12 includes: an air pump 1201, an air inlet pipe 1202, a filter box 1203, an air supply pipe 1204, a storage net box 1205, a push-pull handle 1206 and an air outlet pipe 1 207, the vacuum pump 1201 and the filter box 1203 are both fixedly installed in the adapter frame 9, the air inlet of the vacuum pump 1201 is connected to the air inlet pipe 1202 inserted into the extension pipe 801, the air outlet of the vacuum pump 1201 is connected to the air delivery pipe 1204 inserted into the filter box 1203, the right side of the filter box 1203 is installed with an air outlet pipe 1207 inserted into the extension pipe 801, the connection between the air inlet pipe 1202 and the extension pipe 801 is located below the solenoid valve 802, and the connection between the air outlet pipe 1207 and the extension pipe 801 is located above the solenoid valve 802, a storage net box 1205 is slidably installed in the filter box 1203, the storage net box 1205 is filled with activated carbon, and a push-pull handle 1206 is fixed to the front side of the storage net box 1205,Two limiting mechanisms 14 for blocking the storage net box 1205 are installed on the filter box 1203. During normal use, the solenoid valve 802 is opened, and air is blown into the chemical laboratory 1 through the ventilation fan 6. The outside air passes through the dust filter 4 and enters the chemical laboratory 1. The dust in the air flow is filtered out by the dust filter 4. The air in the chemical laboratory 1 enters from the exhaust nozzle 8 and is discharged to the outside of the chemical laboratory 1 along the extension pipe 801, the corrugated hose 13 and the exhaust duct 7, thereby realizing the air flow in the chemical laboratory 1. When more irritating odors are generated in the chemical laboratory 1, the solenoid valve 802 is closed and the air is exhausted. Pump 1201, through the vacuum pump 1201 to suck the air in the chemical laboratory 1, the vacuum pump 1201 transports the air to the filter box 1203, the activated carbon in the filter box 1203 absorbs the irritating odor in the air, the adsorbed air enters the extension pipe 801 again from the outlet pipe 1207, and then the airflow is discharged to the outside of the chemical laboratory 1 along the corrugated hose 13 and the exhaust duct 7, thereby reducing the pollution to the outside air. After a period of use, the dust accumulated on the dust filter 4 can be cleaned by the automatic dust cleaning device 5, and then the activated carbon in the storage net box 1205 can be replaced.

[0038] The automatic dust cleaning device 5 includes: a first motor 501, a first gear 502, a second gear 503, a transmission shaft 504 and a cleaning brush 505. The first motor 501 is fixed inside the ventilation pipe 3. The first gear 502 is fixedly installed on the output shaft of the first motor 501. A second gear 503 meshing with the first gear 502 is provided on one side of the first gear 502. The second gear 503 is fixedly installed on the transmission shaft 504. The transmission shaft 504 is rotatably connected to the ventilation pipe 3. The transmission shaft 504 is fixed to the cleaning brush 505. When in use, the first motor 501 drives the first gear 502 to rotate, the first gear 502 rotates to drive the second gear 503 to rotate, the second gear 503 rotates to drive the transmission shaft 504 to rotate, the transmission shaft 504 rotates to drive the cleaning brush 505 to rotate, and the cleaning brush 505 rotates to clean up the dust accumulated on the dust filter 4.

[0039] The height adjustment mechanism 11 includes: a bearing seat 1101, a drive shaft 1102, a second motor 1103, a winding wheel 1104 and a wire rope 1105. Two bearing seats 1101 are fixedly installed on the top of the interior of the chemical laboratory 1. The drive shaft 1102 is rotatably connected between the two bearing seats 1101. Two winding wheels 1104 are fixedly installed on the drive shaft 1102. Each winding wheel 1104 is wound with a wire rope 1105. The upper end of the wire rope 1105 is connected to the winding wheel 1101. 104 is fixed, the lower end of the wire rope 1105 is fixed to the adapter frame 9, the second motor 1103 is fixedly installed on the internal top of the chemical laboratory 1, and the output shaft of the second motor 1103 is fixed to the driving shaft 1102. When in use, the driving shaft 1102 is driven to rotate by the second motor 1103, and the winding wheel 1104 is driven to rotate by the driving shaft 1102. The wire rope 1105 is extended and retracted by the winding wheel 1104, and the adapter frame 9 is driven to move up and down by the wire rope 1105.

[0040] The limiting mechanism 14 includes: an adapter block 1401, a shielding rod 1402 and a spring 1403. The adapter block 1401 is fixed to the filter box 1203. The shielding rod 1402 is slidably installed on the adapter block 1401. The shielding rod 1402 is located at the front side of the storage net box 1205 to block it. A spring 1403 is installed on the outer side of the lower half of the shielding rod 1402. The upper end of the spring 1403 is fixed to the adapter block 1401 and the lower end is fixed to the shielding rod 1402. When the activated carbon needs to be replaced, the shielding rod 1402 is first pulled down to move it away from the front side of the storage net box 1205, and then the storage net box 1205 is pulled out of the filter box 1203, so that the activated carbon in the storage net box 1205 can be replaced.

[0041] Working principle: When the chemical experiment ventilation equipment is used normally, the solenoid valve 802 is opened, and air is blown into the chemical laboratory 1 through the ventilation fan 6. The outside air passes through the dust filter 4 and enters the chemical laboratory 1. The dust in the air flow is filtered out by the dust filter 4. The air in the chemical laboratory 1 enters from the exhaust nozzle 8 and is discharged to the outside of the chemical laboratory 1 along the extension pipe 801, the corrugated hose 13 and the exhaust duct 7, thereby realizing the air flow in the chemical laboratory 1;

[0042] When more pungent odors are generated in the chemical laboratory 1, the electromagnetic valve 802 is closed and the air pump 1201 is turned on. The air in the chemical laboratory 1 is sucked by the air pump 1201, and the air pump 1201 transports the air to the filter box 1203. The activated carbon in the filter box 1203 adsorbs the pungent odors in the air. The adsorbed air enters the extension tube 801 again from the outlet pipe 1207, and then the airflow is discharged to the outside of the chemical laboratory 1 along the corrugated hose 13 and the exhaust duct 7, thereby reducing the pollution to the outside air.

[0043] The second motor 1103 drives the driving shaft 1102 to rotate, and the driving shaft 1102 drives the winding wheel 1104 to rotate, and the winding wheel 1104 drives the wire rope 1105 to extend and retract, and the wire rope 1105 drives the adapter frame 9 to move up and down, and the adapter frame 9 drives the exhaust nozzle 8 to move up and down, so that the exhaust nozzle 8 is closer to the odor source, so that the exhaust nozzle 8 has a better absorption effect on the odor;

[0044] After a period of use, the first motor 501 drives the first gear 502 to rotate, the first gear 502 drives the second gear 503 to rotate, the second gear 503 drives the transmission shaft 504 to rotate, the transmission shaft 504 drives the cleaning brush 505 to rotate, and the cleaning brush 505 rotates to clean the dust accumulated on the dust filter 4;

[0045] After using for a period of time, the shielding rod 1402 is pulled down to move it away from the front side of the storage net box 1205, and then the storage net box 1205 is pulled out of the filter box 1203 to replace the activated carbon in the storage net box 1205.

[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. Chemical experiment ventilation equipment, characterized in that: The invention comprises a chemical laboratory (1), an experimental operation table (2), a ventilation pipe (3), a dust filter (4), a ventilation fan (6), an exhaust duct (7), an exhaust nozzle (8), an adapter frame (9), a limiting guide rod (10), a height adjustment mechanism (11), an odor adsorption mechanism (12), a corrugated hose (13) and a limiting mechanism (14). The chemical laboratory (1) is provided with an experimental operation table (2), a ventilation pipe (3) is fixedly installed on the right side wall of the chemical laboratory (1), a ventilation fan (6) is fixedly installed in the ventilation pipe (3), and the ventilation pipe (3) is provided with a plurality of air-conditioning devices. A dust filter (4) is fixedly installed at the right end, the exhaust duct (7) is fixed to the internal top of the chemical laboratory (1), an exhaust nozzle (8) is arranged above the experimental operation table (2), an extension tube (801) is fixed on the upper side of the exhaust nozzle (8), a solenoid valve (802) is installed on the extension tube (801), the extension tube (801) is connected to the exhaust duct (7) through a corrugated hose (13), an adapter frame (9) is fixed on the outside of the extension tube (801), a height adjustment mechanism (11) is installed at the internal top of the chemical laboratory (1), and the height adjustment mechanism (11) is installed at the internal top of the chemical laboratory (1). The degree adjustment mechanism (11) is used to drive the adapter frame (9), the extension tube (801) and the exhaust nozzle (8) to move up and down. The adapter frame (9) is equipped with an odor adsorption mechanism (12) connected to the extension tube (801). The odor adsorption mechanism (12) includes: an air pump (1201), an air inlet pipe (1202), a filter box (1203), an air delivery pipe (1204), a storage net box (1205), a push-pull handle (1206) and an air outlet pipe (1207). The air pump (1201) and the filter box (1203) are both fixedly installed in the adapter frame (9). The air inlet of the vacuum pump (1201) is connected to an air inlet pipe (1202) inserted into the extension pipe (801), the air outlet of the vacuum pump (1201) is connected to an air supply pipe (1204) inserted into the filter box (1203), the right side of the filter box (1203) is equipped with an air outlet pipe (1207) inserted into the extension pipe (801), a storage net box (1205) is slidably installed in the filter box (1203), the storage net box (1205) is filled with activated carbon, and a push-pull handle (1206) is fixed to the front side of the storage net box (1205).

2. The chemical experiment ventilation equipment according to claim 1, characterized in that: The connection point between the air inlet pipe (1202) and the extension pipe (801) is located below the solenoid valve (802), and the connection point between the air outlet pipe (1207) and the extension pipe (801) is located above the solenoid valve (802).

3. The chemical experiment ventilation equipment according to claim 1, characterized in that: The left end outlet of the exhaust duct (7) extends to the outside of the chemical laboratory (1).

4. The chemical experiment ventilation equipment according to claim 1, characterized in that: A limiting slider (901) is fixed on both the left and right sides of the adapter frame (9), and two limiting guide rods (10) are fixed on the inner top of the chemical laboratory (1), each limiting guide rod (10) passes through a limiting slider (901), and the limiting slider (901) is in sliding contact with the limiting guide rod (10).

5. The chemical experiment ventilation equipment according to claim 4, characterized in that: A stopper (1001) is fixed to the bottom of each of the position-limiting guide rods (10).

6. The chemical experiment ventilation equipment according to claim 1, characterized in that: An automatic dust cleaning device (5) is installed in the ventilation pipe (3), and the automatic dust cleaning device (5) is used to clean the dust filter (4).

7. The chemical experiment ventilation equipment according to claim 6, characterized in that: The automatic dust cleaning device (5) comprises: a first motor (501), a first gear (502), a second gear (503), a transmission shaft (504) and a cleaning brush (505); the first motor (501) is fixed inside the ventilation pipe (3); the first gear (502) is fixedly mounted on the output shaft of the first motor (501); a second gear (503) meshing with the first gear (502) is provided on one side of the first gear (502); the second gear (503) is fixedly mounted on the transmission shaft (504); the transmission shaft (504) is rotatably connected to the ventilation pipe (3); and the transmission shaft (504) is fixed to the cleaning brush (505).

8. The chemical experiment ventilation equipment according to claim 1, characterized in that: The height adjustment mechanism (11) comprises: a bearing seat (1101), a drive shaft (1102), a second motor (1103), a winding wheel (1104) and a steel wire rope (1105); two bearing seats (1101) are fixedly installed at the top of the interior of the chemical laboratory (1); a drive shaft (1102) is rotatably connected between the two bearing seats (1101); two winding wheels (1104) are fixedly installed on the drive shaft (1102); a steel wire rope (1105) is wound around each winding wheel (1104); the upper end of the steel wire rope (1105) is fixed to the winding wheel (1104); the lower end of the steel wire rope (1105) is fixed to the adapter frame (9); the second motor (1103) is fixedly installed at the top of the interior of the chemical laboratory (1); and the output shaft of the second motor (1103) is fixed to the drive shaft (1102).

9. The chemical experiment ventilation equipment according to claim 1, characterized in that: The filter box (1203) is provided with two limiting mechanisms (14) for blocking the storage net box (1205).

10. The chemical experiment ventilation equipment according to claim 9, characterized in that: The limiting mechanism (14) comprises: an adapter block (1401), a shielding rod (1402) and a spring (1403); the adapter block (1401) is fixed to the filter box (1203); a shielding rod (1402) is slidably mounted on the adapter block (1401); the shielding rod (1402) is located at the front side of the storage net box (1205) to block it; a spring (1403) is mounted on the outer side of the lower half of the shielding rod (1402); the upper end of the spring (1403) is fixed to the adapter block (1401) and the lower end is fixed to the shielding rod (1402).

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