CN216260830U

CN216260830U - Biological safety cabinet

Info

Publication number: CN216260830U
Application number: CN202122978788.1U
Authority: CN
Inventors: 王志鸿; 伍国梁
Original assignee: Dalian Zhongxing Precision Technology Co ltd
Current assignee: Dalian Zhongxing Precision Technology Co ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-04-12
Anticipated expiration: 2031-11-30

Abstract

The utility model relates to the technical field of experimental instruments, in particular to a biological safety cabinet.A set of first filter screens are rotated by ninety degrees when an exhaust device of the biological safety cabinet runs, a set of electric push rods are extended, a third motor is simultaneously started to rotate a cleaning roller, the first filter screens are cleaned, a dust collector is opened again, dust cleaned by the cleaning roller is sucked into a filter box, the dust is filtered by a plurality of sets of dust filter screens, gas is exhausted through a ventilation port of the filter box, then the first filter screens are reset, the first filter screens of the other set rotate by ninety degrees, the other cleaning device is used for cleaning the first filter screens of the other set, and meanwhile, the two cleaning devices on the air suction device repeat the steps to clean the second filter screens, so that the blockage of the first filter screens and the second filter screens is reduced, and the safety of equipment is improved; comprises an exhaust device, an air suction device, a plurality of groups of cleaning devices and a biological safety cabinet.

Description

Biological safety cabinet

Technical Field

The utility model relates to the technical field of experimental instruments, in particular to a biological safety cabinet.

Background

A biological safety cabinet (bsc) is a box-type air purification negative pressure safety device that can prevent aerosol from escaping from some dangerous or unknown biological particles contained in the experimental operation treatment process. The existing biological safety cabinet has a simpler structure, dust and impurities easily block a filter screen after long-time use, air inflow and exhaust of equipment are influenced, air in the safety cabinet is exhausted outside the cabinet, physical health of workers and surrounding environment are influenced, safety is low, and therefore the existing equipment needs to be improved.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model provides a biosafety cabinet which enables a group of first filter screens to rotate ninety degrees when an exhaust device operates, extends through a group of electric push rods, simultaneously opens a third motor, enables a cleaning roller to rotate, cleans the group of first filter screens, then opens a dust collector, sucks dust cleaned by the cleaning roller into a filter box, discharges air through a ventilation port of the filter box after being filtered by a plurality of groups of dust filter screens, then resets one group of first filter screens, rotates the other group of first filter screens ninety degrees, enables the other group of cleaning devices to clean the other group of first filter screens, and simultaneously repeats the steps by two groups of cleaning devices on an air suction device, cleans two groups of second filter screens, reduces blockage of the first filter screens and the second filter screens, and improves the safety of equipment.

The utility model discloses a biological safety cabinet, which comprises an exhaust device, an air suction device, a plurality of groups of cleaning devices and a biological safety cabinet, wherein the exhaust device is arranged at the top end of the biological safety cabinet and discharges air into the biological safety cabinet;

the cleaning device comprises slide rails, sliding blocks, electric push rods, cleaning rollers, a third motor, a support, a rotary connecting pipe, a filter box, a plurality of groups of dust filtering nets and a dust collector, the slide rails on the plurality of groups of cleaning devices are respectively arranged at the top ends of the exhaust device and the air suction device, the electric push rods on the plurality of groups of cleaning devices are respectively arranged on the side walls of the exhaust device and the air suction device, the top ends of the sliding blocks are slidably arranged with the bottom ends of the slide rails, one ends of the electric push rods are connected with the side ends of the sliding blocks, the cleaning rollers are arranged at the bottom ends of the sliding blocks, a plurality of dust collecting holes are arranged on the cleaning rollers, air ducts are arranged in the cleaning rollers, the third motor is arranged at the front ends of the cleaning rollers and drives the cleaning rollers, the rotary connecting pipe is rotatably arranged at the rear ends of the cleaning rollers through the support, one ends of the rotary connecting pipe are connected with the air ducts of the cleaning rollers, and the other ends of the rotary connecting pipe are connected with the filter box through a connecting hose, the filter boxes and the dust collectors on the cleaning devices are respectively arranged at the top ends of the exhaust device and the suction device, the dust filtering nets are all arranged inside the filter boxes, and the filter boxes are provided with air exchange ports;

when the exhaust device operates, a group of first filter screens rotate ninety degrees, the first filter screens extend through a group of electric push rods, the third motor is simultaneously opened, the cleaning rollers are enabled to rotate, a group of first filter screens are cleaned, the dust collector is opened again, dust cleaned by the cleaning rollers is sucked into the filter box, the dust is filtered by the plurality of groups of dust filter screens, gas is discharged through the ventilation ports of the filter box, then the first filter screens are reset, the first filter screens of the other group rotate ninety degrees, the other group of cleaning devices are enabled to clean the first filter screens of the other group, meanwhile, the two groups of cleaning devices on the air suction device repeat the steps, two groups of second filter screens are cleaned, the blockage of the first filter screens and the second filter screens is reduced, and the safety of equipment is improved.

Preferably, the exhaust device comprises an air inlet box, a first exhaust pump, an exhaust hopper and two groups of first motors, the bottom end of the air inlet box is mounted at the top end of the biological safety cabinet, an inlet is formed in the left end of the air inlet box, the two groups of first filter screens are rotatably mounted inside the air inlet box, the two groups of first motors are mounted at the front end of the air inlet box and respectively drive the two groups of first filter screens, the top end of the first exhaust pump is connected with the top end inside the biological safety cabinet, an air suction pipe is arranged at the right end of the first exhaust pump, an exhaust port is formed in the bottom end of the first exhaust pump, and the air suction pipe of the first exhaust pump is communicated with the inside of the air inlet box; through opening first exhaust pump, with the inside of air suction to the inlet box, after two sets of first filter screens filter, first exhaust pump is discharging the air to the biological safety cabinet to improve equipment's practicality.

Preferably, the air suction device comprises a workbench, an exhaust box, a second exhaust pump, an air suction hopper and two groups of second motors, the top end of the workbench is arranged at the bottom end of the biological safety cabinet, and a chamber is arranged in the workbench, the interior of the biological safety cabinet is communicated with the interior of the workbench, the bottom end of the exhaust box is connected with the bottom end in the workbench, and the right end of the exhaust box is provided with a discharge port, two groups of second filter screens are rotatably arranged in the exhaust box, the bottom end of a second exhaust pump is connected with the top end of the exhaust box, the left end of the second exhaust pump is provided with a gas pipe, the top end of the second exhaust pump is provided with a gas inlet, the bottom end of the gas suction hopper is connected with the top end of the gas inlet of the second exhaust pump, the gas pipe of the second exhaust pump is communicated with the interior of the exhaust box, the two groups of second motors are both arranged at the front end of the workbench, and the two groups of second motors respectively drive the two groups of second filter screens; through opening the second air pump, in discharging the air in the biosafety cabinet to the air-out case, after two sets of second filter screens filter, the air-out case is discharged the air to carry out centralized processing to air-out case exhaust air, thereby improve equipment's practicality.

Preferably, the cleaning device further comprises two groups of springs, one ends of the two groups of springs are connected with one end of the sliding block, and the other ends of the two groups of springs are connected with one end of the cleaning roller; the elastic extrusion through two sets of springs cleans the roller, makes the roller that cleans on the multiunit cleaning device clear up first filter screen and second filter screen to improve the clearance effect.

Preferably, the device also comprises a plurality of groups of ultraviolet germicidal lamps, wherein the ultraviolet germicidal lamps are respectively arranged in the biological safety cabinet, the air inlet box, the exhaust box and the filter box; the biosafety cabinet, the air inlet box, the exhaust box, the filter box and the multiple groups of ultraviolet germicidal lamps are controlled to be opened independently, so that light rays emitted by the multiple groups of ultraviolet germicidal lamps sterilize the biosafety cabinet, the air inlet box, the exhaust box and the filter box, and the safety of equipment is improved.

Preferably, the biological safety cabinet comprises a cabinet body, a transparent sealing plate, a transparent control door and two groups of sealing doors, wherein the top end of the cabinet body is connected with the bottom end of the air inlet box, the bottom end of the cabinet body is connected with the top end of the workbench, the side end of the transparent sealing plate is connected with the front end of the cabinet body, the left end and the right end of the transparent control door are both slidably installed with the front end of the cabinet body, and the side ends of the two groups of sealing doors are both rotatably connected with the front end of the cabinet body; through upwards raising the transparent door of controlling, make things convenient for the staff to stretch into the inside of the cabinet body with the hand and carry out the experiment operation, later after the equipment uses, close two sets of sealing doors, open the multiunit sterilamp in the biosafety cabinet, disinfect the disinfection to the inside of biosafety cabinet to improve equipment's convenience.

Compared with the prior art, the utility model has the beneficial effects that: when the exhaust device operates, a group of first filter screens rotate ninety degrees, the first filter screens extend through a group of electric push rods, the third motor is simultaneously opened, the cleaning rollers are enabled to rotate, a group of first filter screens are cleaned, the dust collector is opened again, dust cleaned by the cleaning rollers is sucked into the filter box, the dust is filtered by the plurality of groups of dust filter screens, gas is discharged through the ventilation ports of the filter box, then the first filter screens are reset, the first filter screens of the other group rotate ninety degrees, the other group of cleaning devices are enabled to clean the first filter screens of the other group, meanwhile, the two groups of cleaning devices on the air suction device repeat the steps, two groups of second filter screens are cleaned, the blockage of the first filter screens and the second filter screens is reduced, and the safety of equipment is improved.

Drawings

FIG. 1 is a schematic view of the front cross-sectional structure of the present invention;

FIG. 2 is a schematic elevation view of the present invention;

FIG. 3 is an enlarged schematic view of the cleaning roller and the third motor;

FIG. 4 is an enlarged view of portion A of FIG. 1 according to the present invention;

in the drawings, the reference numbers: 1. a biological safety cabinet; 2. an air intake box; 3. a first filter screen; 4. a first exhaust pump; 5. an exhaust hopper; 6. a first motor; 7. a work table; 8. an exhaust box; 9. a second filter screen; 10. a second exhaust pump; 11. an air suction hopper; 12. a second motor; 13. a slide rail; 14. a slider; 15. an electric push rod; 16. cleaning the roller; 17. a third motor; 18. a support; 19. rotating the connecting pipe; 20. a filter box; 21. a dust filter screen; 22. a vacuum cleaner; 23. a spring; 24. an ultraviolet germicidal lamp; 25. a cabinet body; 26. a transparent sealing plate; 27. a transparent operating door; 28. and (4) sealing the door.

Detailed Description

To facilitate an understanding of the utility model, the utility model will now be described more fully with reference to the accompanying drawings. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Example 1

The air exhaust device is arranged at the top end of the biological safety cabinet 1 and exhausts air into the biological safety cabinet 1, the air suction device is arranged at the bottom end of the biological safety cabinet 1 and exhausts the air in the biological safety cabinet 1, two groups of first filter screens 3 and two groups of second filter screens 9 are respectively arranged in the air exhaust device and the air suction device, and a plurality of groups of cleaning devices are respectively arranged in the air exhaust device and the air suction device and clean dust in the air exhaust device and the air suction device;

the cleaning device comprises slide rails 13, a slide block 14, electric push rods 15, a cleaning roller 16, a third motor 17, a support 18, a rotary connecting pipe 19, a filter box 20, a plurality of groups of dust filtering nets 21 and a dust collector 22, wherein the slide rails 13 on the plurality of groups of cleaning devices are respectively arranged at the top ends of an exhaust device and an air suction device, the electric push rods 15 on the plurality of groups of cleaning devices are respectively arranged on the side walls of the exhaust device and the air suction device, the top end of the slide block 14 is slidably arranged with the bottom end of the slide rail 13, one end of the electric push rod 15 is connected with the side end of the slide block 14, the cleaning roller 16 is arranged at the bottom end of the slide block 14, a plurality of dust collecting holes are arranged on the cleaning roller 16, an air duct is arranged in the cleaning roller 16, the third motor 17 is arranged at the front end of the cleaning roller 16 and drives the cleaning roller 16, the rotary connecting pipe 19 is rotatably arranged at the rear end of the cleaning roller 16 through the support 18, and one end of the rotary connecting pipe 19 is connected with the air duct of the cleaning roller 16, the other end of the rotary connecting pipe 19 is connected with a filter box 20 through a connecting hose, the filter boxes 20 and dust collectors 22 on the multiple groups of cleaning devices are respectively arranged at the top ends of an exhaust device and an air suction device, the multiple groups of dust filtering nets 21 are all arranged inside the filter box 20, and the filter box 20 is provided with a ventilation port;

the air exhaust device comprises an air inlet box 2, a first exhaust pump 4, an exhaust hopper 5 and two groups of first motors 6, wherein the bottom end of the air inlet box 2 is installed at the top end of the biological safety cabinet 1, an inlet is formed in the left end of the air inlet box 2, two groups of first filter screens 3 are rotatably installed inside the air inlet box 2, two groups of first motors 6 are installed at the front end of the air inlet box 2, the two groups of first motors 6 are used for driving the two groups of first filter screens 3 respectively, the top end of the first exhaust pump 4 is connected with the top end inside the biological safety cabinet 1, an air suction pipe is formed in the right end of the first exhaust pump 4, an exhaust port is formed in the bottom end of the first exhaust pump 4, and the air suction pipe of the first exhaust pump 4 is communicated with the inside of the air inlet box 2;

the air suction device comprises a workbench 7, an exhaust box 8, a second exhaust pump 10, an air suction hopper 11 and two groups of second motors 12, wherein the top end of the workbench 7 is arranged at the bottom end of the biological safety cabinet 1, a chamber is arranged inside the workbench 7, the interior of the biological safety cabinet 1 is communicated with the interior of the workbench 7, the bottom end of the exhaust box 8 is connected with the bottom end inside the workbench 7, the right end of the exhaust box 8 is provided with a discharge port, two groups of second filter screens 9 are rotatably arranged inside the exhaust box 8, the bottom end of the second exhaust pump 10 is connected with the top end of the exhaust box 8, the left end of the second exhaust pump 10 is provided with an air pipe, the top end of the second exhaust pump 10 is provided with an air inlet, the bottom end of the air suction hopper 11 is connected with the top end of the air inlet of the second exhaust pump 10, the air pipe of the second exhaust pump 10 is communicated with the interior of the exhaust box 8, and two groups of second motors 12 are arranged at the front end of the workbench 7, two groups of second motors 12 respectively drive two groups of second filter screens 9;

by opening the first exhaust pump 4, sucking air into the air intake box 2, filtering by two sets of first filter screens 3, the first exhaust pump 4 discharges air into the biosafety cabinet 1, simultaneously rotating one set of first filter screens 3 by ninety degrees, extending by one set of electric push rod 15, simultaneously opening the third motor 17, rotating the cleaning roller 16, cleaning one set of first filter screens 3, then opening the dust collector 22, sucking dust cleaned by the cleaning roller 16 into the filter box 20, filtering by a plurality of sets of dust filter screens 21, discharging air through the ventilation port of the filter box 20, then resetting one set of first filter screens 3, rotating the other set of first filter screens 3 by ninety degrees, and enabling the other set of cleaning device to clean the other set of first filter screens 3, simultaneously discharging air in the biosafety cabinet 1 into the exhaust box 8 by opening the second exhaust pump 10, filtering by the second filter screen 9, the exhaust box 8 discharges air, the air discharged by the exhaust box 8 is processed in a centralized mode, the steps are repeated, the two groups of second filter screens 9 are cleaned, the blockage of the first filter screens 3 and the blockage of the second filter screens 9 are reduced, and therefore the safety of the equipment is improved.

Example 2

a plurality of groups of ultraviolet germicidal lamps 24 are respectively arranged inside the biological safety cabinet 1, the air inlet box 2, the exhaust box 8 and the filter box 20;

the biological safety cabinet 1 comprises a cabinet body 25, a transparent sealing plate 26, a transparent control door 27 and two groups of sealing doors 28, wherein the top end of the cabinet body 25 is connected with the bottom end of the air inlet box 2, the bottom end of the cabinet body 25 is connected with the top end of the workbench 7, the side end of the transparent sealing plate 26 is connected with the front end of the cabinet body 25, the left end and the right end of the transparent control door 27 are both slidably mounted with the front end of the cabinet body 25, and the side ends of the two groups of sealing doors 28 are both rotatably connected with the front end of the cabinet body 25;

when the exhaust device operates, a group of first filter screens 3 rotate ninety degrees, the first filter screens 3 are extended through a group of electric push rods 15, the third motor 17 is simultaneously opened, the cleaning roller 16 rotates, the first filter screens 3 are cleaned, the dust collector 22 is opened, dust cleaned by the cleaning roller 16 is sucked into the filter box 20, after being filtered by a plurality of groups of dust filter screens 21, air is exhausted through the ventilation port of the filter box 20, then the first filter screens 3 are reset, the other group of first filter screens 3 rotate ninety degrees, the other group of cleaning devices are used for cleaning the other group of first filter screens 3, meanwhile, the two groups of cleaning devices on the air suction device repeat the steps to clean the two groups of second filter screens 9, the blockage of the first filter screens 3 and the second filter screens 9 is reduced, and simultaneously, the transparent control door 27 is lifted upwards, so that a worker can conveniently stretch hands into the cabinet body 25 for experimental operation, after the equipment is used, the two groups of sealing doors 28 are closed, and then the biosafety cabinet 1, the air inlet box 2, the exhaust box 8, the filter box 20 and the multiple groups of ultraviolet sterilizing lamps 24 are independently controlled to be opened, so that the light rays emitted by the multiple groups of ultraviolet sterilizing lamps 24 sterilize and disinfect the interiors of the biosafety cabinet 1, the air inlet box 2, the exhaust box 8 and the filter box 20, and the safety of the equipment is improved.

As shown in fig. 1 to 4, in the biosafety cabinet of the present invention, when operating, first, the first exhaust pump 4 is opened to suck air into the air inlet box 2, after the air is filtered by two sets of first filter screens 3, the first exhaust pump 4 discharges the air into the biosafety cabinet 1, the second exhaust pump 10 is opened to discharge the air in the biosafety cabinet 1 into the exhaust box 8, after the air is filtered by two sets of second filter screens 9, the exhaust box 8 discharges the air, at the same time, one set of first filter screens 3 rotates ninety degrees, the third motor 17 is opened by extending through one set of electric push rod 15, the cleaning roller 16 rotates, the cleaning roller 16 is pressed by the elasticity of two sets of springs 23 to clean one set of first filter screens 3, the dust collector 22 is opened to suck the dust cleaned by the cleaning roller 16 into the filter box 20, after the dust is filtered by multiple sets of dust filter screens 21, the air is discharged through the ventilation port of the filter box 20, later a set of first filter screen 3 resets, another a set of first filter screen 3 is ninety degrees rotatory, and make another group of cleaning device clear up another group of first filter screen 3, two sets of cleaning device on the getter device repeat above-mentioned step simultaneously, clear up two sets of second filter screens 9, reduce the jam of first filter screen 3 and second filter screen 9, then through upwards lifting up transparent control door 27, make things convenient for the staff to stretch into the inside of the cabinet body 25 with the hand and carry out the experiment operation, later after the equipment uses, close two sets of sealing door 28, through independent control biosafety cabinet 1, air inlet box 2, exhaust box 8 and rose box 20 and the opening of multiunit sterilamp 24, the light that makes multiunit sterilamp 24 send can to biosafety cabinet 1, air inlet box 2, the inside of exhaust box 8 and rose box 20 is disinfected.

The main functions realized by the utility model are as follows: under the condition of not shutting down, clear up first filter screen 3 and second filter screen 9, reduce the jam of first filter screen 3 and second filter screen 9, improve equipment's security.

According to the biological safety cabinet, the installation mode, the connection mode or the arrangement mode are common mechanical modes, and the biological safety cabinet can be implemented as long as the beneficial effects of the biological safety cabinet are achieved; the first exhaust pump 4, the first motor 6, the second exhaust pump 10, the second motor 12, the electric push rod 15, the third motor 17 and the multiple groups of ultraviolet germicidal lamps 24 of the biological safety cabinet are purchased from the market, and technicians in the industry only need to install and operate according to the attached operating instructions without creative labor of the technicians in the field.

All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. A biosafety cabinet is characterized by comprising an exhaust device, an air suction device, a plurality of groups of cleaning devices and a biosafety cabinet (1), wherein the exhaust device is installed at the top end of the biosafety cabinet (1) and discharges air into the biosafety cabinet (1), the air suction device is installed at the bottom end of the biosafety cabinet (1) and discharges the air in the biosafety cabinet (1), two groups of first filter screens (3) and two groups of second filter screens (9) are respectively installed in the exhaust device and the air suction device, and the plurality of groups of cleaning devices are respectively installed in the exhaust device and the air suction device and clean dust in the exhaust device and the air suction device;

the cleaning device comprises slide rails (13), slide blocks (14), electric push rods (15), cleaning rollers (16), a third motor (17), a support (18), a rotary connecting pipe (19), a filter box (20), a plurality of groups of dust filtering nets (21) and a dust collector (22), the slide rails (13) on the plurality of groups of cleaning devices are respectively arranged at the top ends of an exhaust device and an air suction device, the electric push rods (15) on the plurality of groups of cleaning devices are respectively arranged on the side walls in the exhaust device and the air suction device, the top ends of the slide blocks (14) are slidably arranged at the bottom ends of the slide rails (13), one ends of the electric push rods (15) are connected with the side ends of the slide blocks (14), the cleaning rollers (16) are arranged at the bottom ends of the slide blocks (14), a plurality of dust suction holes are arranged on the cleaning rollers (16), air ducts are arranged in the cleaning rollers (16), the third motor (17) is arranged at the front ends of the cleaning rollers (16), the cleaning roller (16) is driven, a rotary connecting pipe (19) is rotatably arranged at the rear end of the cleaning roller (16) through a support (18), one end of the rotary connecting pipe (19) is connected with an air channel of the cleaning roller (16), the other end of the rotary connecting pipe (19) is connected with a filter box (20) through a connecting hose, the filter boxes (20) and dust collectors (22) on a plurality of groups of cleaning devices are respectively arranged at the top ends of an exhaust device and an air suction device, a plurality of groups of dust filtering nets (21) are arranged inside the filter boxes (20), and air exchange ports are formed in the filter boxes (20).

2. The biosafety cabinet according to claim 1, characterized in that the air exhaust device comprises an air inlet box (2), a first exhaust pump (4), an exhaust hopper (5) and two sets of first motors (6), the bottom end of the air inlet box (2) is installed at the top end of the biosafety cabinet (1), an inlet is arranged at the left end of the air inlet box (2), two groups of first filter screens (3) are rotatably arranged inside the air inlet box (2), two groups of first motors (6) are arranged at the front end of the air inlet box (2), and two groups of first motors (6) respectively drive two groups of first filter screens (3), the top end of the first exhaust pump (4) is connected with the top end in the biological safety cabinet (1), and the right end of the first exhaust pump (4) is provided with an air suction pipe, the bottom end of the first exhaust pump (4) is provided with an air outlet, and the air suction pipe of the first exhaust pump (4) is communicated with the inside of the air inlet box (2).

3. The biosafety cabinet according to claim 1, wherein the air suction device comprises a workbench (7), an air discharge box (8), a second air discharge pump (10), an air suction hopper (11) and two sets of second motors (12), the top end of the workbench (7) is installed at the bottom end of the biosafety cabinet (1), a chamber is arranged inside the workbench (7), the interior of the biosafety cabinet (1) is communicated with the interior of the workbench (7), the bottom end of the air discharge box (8) is connected with the bottom end inside the workbench (7), the right end of the air discharge box (8) is provided with an exhaust port, two sets of second filter screens (9) are rotatably installed inside the air discharge box (8), the bottom end of the second air discharge pump (10) is connected with the top end of the air discharge box (8), the left end of the second air discharge pump (10) is provided with an air delivery pipe, the top end of the second air discharge pump (10) is provided with an air inlet, the bottom end of the air suction hopper (11) is connected with the top end of an air inlet of a second exhaust pump (10), an air delivery pipe of the second exhaust pump (10) is communicated with the inside of the exhaust box (8), two groups of second motors (12) are arranged at the front end of the workbench (7), and the two groups of second motors (12) respectively drive two groups of second filter screens (9).

4. A biosafety cabinet according to claim 1, further comprising two sets of springs (23), one end of each set of springs (23) being connected to one end of the slide block (14), the other end of each set of springs (23) being connected to one end of the cleaning roller (16).

5. The biosafety cabinet according to claim 4, further comprising a plurality of groups of ultraviolet germicidal lamps (24), wherein the plurality of groups of ultraviolet germicidal lamps (24) are respectively installed inside the biosafety cabinet (1), the air inlet box (2), the exhaust box (8) and the filter box (20).

6. The biosafety cabinet according to claim 1, characterized in that the biosafety cabinet (1) comprises a cabinet body (25), a transparent sealing plate (26), a transparent control door (27) and two sets of sealing doors (28), wherein the top end of the cabinet body (25) is connected with the bottom end of the air inlet box (2), the bottom end of the cabinet body (25) is connected with the top end of the workbench (7), the side end of the transparent sealing plate (26) is connected with the front end of the cabinet body (25), the left end and the right end of the transparent control door (27) are both slidably mounted with the front end of the cabinet body (25), and the side ends of the two sets of sealing doors (28) are both rotatably connected with the front end of the cabinet body (25).