CN114471135B

CN114471135B - VOCs exhaust treatment device

Info

Publication number: CN114471135B
Application number: CN202210127831.XA
Authority: CN
Inventors: 江源
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-02-11
Filing date: 2022-02-11
Publication date: 2022-10-11
Anticipated expiration: 2042-02-11
Also published as: CN114471135A

Abstract

The invention discloses a VOCs waste gas treatment device which comprises a purification unit, a purification plate, a first replacement box, a purification bag placing box and a second replacement box, wherein the purification plate is arranged on the purification plate; through holes are formed in two sides of the inner wall of the purification unit, the first replacement box and the second replacement box are respectively located on two sides of the purification unit and are in sealed conduction with the through holes, and the purification bag placement box is connected to the interiors of the first replacement box and the second replacement box in a sliding mode and in the through holes in the inner wall of the purification unit; through the setting that the case was placed to the purification package, can make the purification package that is using and do not possess the purification package that uses once more and change automatically, make the slide bar drive the purification package through rotating the drive wheel and place the inside that is located the change case, the inside of change case is changed and is purified the package, the purification package of this device is placed the case and is provided with two cavitys for an intergral plate is inside, make when changing, the inside purification package of two cavitys can follow alternate use, does not influence the normal operating of device.

Description

VOCs exhaust treatment device

Technical Field

The present invention relates to the field of exhaust gas treatment. In particular to a VOCs waste gas treatment device.

Background

VOCs refer to volatile organic compounds, and when the concentration of the volatile organic compounds in indoor air is too high, acute poisoning is easily caused, and the mild people can have headache, dizziness, cough, nausea, vomiting or a drunk shape, so that the toxic and harmful effects on human bodies are great.

Chinese patent document CN 112973380B is a VOCs waste gas treatment device, which comprises a purification body and a purification component arranged inside the purification body, and by arranging multi-level purification units and purification plates, different concentrations and different types of VOCs can be treated, so that the device is efficient and complete in treatment, and different treatment requirements can be met.

Above-mentioned patent is when purifying, and the long-time use of purification package causes the jam etc. easily for purification package loses the effect, and purification package is difficult to change and is caused gaseous to be difficult to realize purifying.

Disclosure of Invention

Therefore, the invention aims to provide a VOCs waste gas treatment device which is convenient for replacing a purification bag.

In order to solve the technical problems, the invention provides the following technical scheme:

a VOCs waste gas treatment device comprises a purification unit, a purification plate, a first replacement box, a purification bag placing box and a second replacement box; through holes are formed in two sides of the inner wall of the purification unit, the first replacement box and the second replacement box are respectively located on two sides of the purification unit and are in sealed conduction with the through holes, the purification package placement box is connected to the inside of the first replacement box and the inside of the second replacement box in a sliding mode and the through holes in the inner wall of the purification unit, two cavities are formed in the purification package placement box, rotating shafts are rotatably mounted at the bottoms of two inner side walls of the cavities, spiral springs are mounted on the rotating shafts and fixedly connected with one end of a clamping plate, the purification plate is located in the cavities and abutted against the top of the clamping plate, purification holes are formed in the inner wall of the purification plate, and a purification package is arranged at the top of the purification plate; the inner walls of the first replacement box and the second replacement box and one end, close to the purification unit, of the second replacement box are rotatably connected with two driving wheels, the two driving wheels are oppositely arranged and driven by a driving belt, a sliding rod is arranged at a gap between the two driving wheels and fixedly arranged on the outer side wall of the purification bag placing box, first sealing plates are inserted into the inner top walls of the first replacement box and the second replacement box, and the structures inside the first replacement box and the second replacement box are the same; purify the package and place the case and for a whole inside two cavitys have been seted up, one of them is located the inside in first purification chamber all the time in two cavitys, place the setting of case through purifying the package, can make the purification package that is using and do not possess the purification package that uses once more and change automatically, make the slide bar drive through rotating the drive wheel and purify the inside that the package was placed the case and is located the change case of difference, the inside of change case is changed and is purified the package, the purification package of this device is placed the case and is provided with two cavitys for an integral plate is inside, make when changing, the inside purification package of two cavitys can be followed alternate use, do not influence the normal operating of device, and guarantee device's purifying effect, the purification package of this device is convenient for change, consequently, can purify to the gas of different gas and different concentration.

In the above device for treating VOCs waste gas, the purification unit includes a first purification chamber, a first exhaust chamber, a second purification chamber, a second exhaust chamber, a third purification chamber and a third exhaust chamber; the top of the first purification cavity is communicated with the bottom of the first exhaust cavity through fluid, the top of the second purification cavity is communicated with the bottom of the second exhaust cavity through fluid, the top of the third purification cavity is communicated with the bottom of the third exhaust cavity through fluid, the first exhaust cavity and the second purification cavity as well as the second exhaust cavity and the third purification cavity are connected through a communicating pipe and a circulating pipe and communicated through fluid, the outlet end of the communicating pipe is hermetically connected with the exhaust pipe and the inlet end of the circulating pipe respectively, the circulating pipe is provided with a first electromagnetic valve, the exhaust pipe is provided with a second electromagnetic valve, the inlet end of the communicating pipe is fixedly connected with the bottoms of the side walls of the first exhaust cavity, the second exhaust cavity and the third exhaust cavity respectively and communicated through fluid, the inner wall of the communicating pipe is provided with a detector, and the detector is electrically connected with the first electromagnetic valve and the second electromagnetic valve; only install the evacuation pipe on the third exhaust chamber, every purifies the structure of chamber and exhaust intracavity portion and is unanimous, sets up mutually independent gas filter and constructs, can carry out the layering to gas and filter, abundant purge gas.

In the above VOCs waste gas treatment device, the inner top wall of the first exhaust cavity is fixedly connected with one end of a compression spring, the other end of the compression spring is fixedly connected with one end surface of a lifting plate, the lifting plate is slidably connected inside the first exhaust cavity, one end of the lifting plate, which is far away from the compression spring, is fixedly connected with the top of a fixed rod, the side wall of the fixed rod is fixedly connected with one end of a slide box, the inner wall of the slide box is provided with a slide groove with an open side wall, the inside of the slide groove is rotatably connected with a first lead screw, the outer wall of the first lead screw is in threaded connection with a slide block, and one end of the first lead screw, which is far away from the fixed rod, is fixedly connected with the output end of a rotating motor; the bottom of the fixed rod is fixedly connected with the outer wall of the fixed ring, the interior of the fixed ring is rotatably connected with a rotary drum, one end face of the rotary drum is fixedly provided with a first sliding plate, the other end face of the rotary drum is fixedly provided with a second sliding plate, the first sliding plate and the second sliding plate are obliquely arranged, the first sliding plate is slidably connected in a strip-shaped groove in the groove plate, one end of the groove plate is hinged to the outer wall of the sliding block, the second sliding plate is slidably connected in a sliding disc, the bottom of the sliding disc is fixedly provided with a second sealing plate, the second sealing plate is slidably connected in an insertion plate, the insertion plate is positioned between the first purification cavity and the first exhaust cavity, and the insertion plate is positioned at the top of the purification bag; through the setting of lifter plate, can be so that the air after the purification is stored, through detecting the back with qualified gaseous exhaust air, unqualified entering into the second through the circulating pipe purifies the chamber and carries out circulation purification once more, through the setting of rotary drum and sliding tray, make when storing gas, the second closing plate seals the second exhaust chamber, prevent that gas leakage from causing the pollution, and through the sealing of second closing plate, the filtering component that can be convenient for changes, prevent gaseous backward flow, cause the filtering difficulty, influence the filter effect.

According to the VOCs waste gas treatment device, the first purification cavity is vertically and rotatably connected with the second lead screw, the top of the second lead screw is rotatably connected inside the pore plate, the pore plate is fixedly installed inside the first purification cavity, the pore plate is abutted to the bottom of the purification bag placing box, one end of the second lead screw is fixedly connected with the output end of the driving motor, the driving motor is fixedly installed at the inner bottom of the first purification cavity, the outer wall of the second lead screw is in threaded connection with the sliding block, the outer wall of the sliding block is provided with the bearing, and the bearing is installed inside the push plate; an airflow channel is formed in the inner wall of the push plate, a fixed plate is mounted on the inner bottom wall of the airflow channel, airflow holes are formed in the inner wall of the fixed plate, two baffles are abutted to the top of the fixed plate, the two baffles are oppositely hinged to the inner wall of the airflow channel, a limit stop is fixedly mounted at the top of the inner side wall of the airflow channel and located at the top of each baffle, and the waste gas inlet pipe is inserted into the side wall of the first purification cavity; the waste gas intake pipe only has the outer wall of first purification chamber to peg graft and has, setting through the push pedal, can make the inside gas that will purify intracavity portion push into the inside of exhaust chamber completely, make the gas that purifies intracavity portion can purify through purifying the package completely, prevent that the residual has gaseous unpurified phenomenon, simultaneously through airflow channel's setting can make behind the push pedal propelling movement gas, follow-up gas gets into fast, be convenient for quick the gaseous upper portion of filtering of going on arrange the back, can make the push pedal descend directly to carry out the inside that extrusion air once more enters into the exhaust chamber, make this device purify more fast, purifying effect is stronger.

The technical scheme of the invention achieves the following beneficial technical effects:

1. the invention is provided with mutually independent gas filtering mechanisms which can carry out layered filtration on gas and fully purify the gas, the purifying bag which is in use and has not been used again can be automatically replaced by arranging the purifying bag placing box, the sliding rod drives the purifying bag placing box to be positioned in different replacing boxes by rotating the driving wheel, and the purifying bag is replaced in the replacing boxes.

2. According to the invention, through the arrangement of the lifting plate, purified air can be stored, qualified gas is discharged after detection, unqualified gas enters the second purification cavity through the circulating pipe to be subjected to secondary circulating purification, and through the arrangement of the rotary drum and the sliding disc, the second sealing plate seals the second exhaust cavity when gas is stored, so that pollution caused by gas leakage is prevented, and through the sealing of the second sealing plate, the replacement of a filter assembly can be facilitated, the backflow of gas is prevented, the difficulty in filtration is prevented, and the filtration effect is influenced.

3. According to the invention, through the arrangement of the push plate, the gas in the purification cavity can be completely pushed into the exhaust cavity, so that the gas in the purification cavity can be completely purified through the purification bag, the phenomenon that residual gas is not purified is prevented, meanwhile, through the arrangement of the gas flow channel, after the push plate pushes the gas, subsequent gas quickly enters, after the upper part of the filtered gas is exhausted quickly, the push plate can descend to directly extrude air into the exhaust cavity again, so that the device can purify more quickly, and has a stronger purification effect.

Drawings

FIG. 1 is a schematic front view of a VOCS exhaust treatment device according to the present invention;

FIG. 2 is a schematic front view of the interior of a VOCS waste gas treatment device according to the present invention;

FIG. 3 is a schematic view of the structure of a purification plate of a VOCS waste gas treatment device according to the present invention;

FIG. 4 is a schematic view of the structure of a rotating drum and a sliding disk of a VOCS waste gas treatment device of the present invention;

FIG. 5 is an enlarged schematic view of a VOCS exhaust treatment device of the present invention at A in FIG. 2.

The reference numbers in the figures denote: 1-a first purification chamber; 2-a first exhaust cavity; 3-a second purification chamber; 4-a second exhaust chamber; 5-a third purifying cavity; 6-a third exhaust chamber; 7-clamping plate; 8-a purification plate; 9-purification holes; 10-purifying the bag; 11-a rotating shaft; 12-a volute spring; 13-a first change bin; 14-a clean-up bag holding box; 15-a slide bar; 16-a first sealing plate; 17-a drive wheel; 18-a transmission belt; 19-a second change bin; 20-compression spring; 21-a lifting plate; 22-a plugboard; 23-a fixing rod; 24-a fixed ring; 25-a rotating drum; 26-a first slide plate; 27-a channel plate; 28-a slide box; 29-a chute; 30-a first lead screw; 31-a slide block; 32-a second sled; 33-a sliding disc; 34-a second seal plate; 35-communicating tube; 36-circulation pipe; 37-a first solenoid valve; 38-evacuation pipe; 39-a second solenoid valve; 40-a second lead screw; 41-driving motor; 42-a bearing; 43-push plate; 44-an air flow channel; 45-fixing the plate; 46-airflow holes; 47-a baffle; 49-well plate; 50-exhaust gas inlet pipe.

Detailed Description

A VOCs waste gas treatment device, as shown in figures 1-3, comprises a purification unit, a purification plate 8, a first replacement box 13, a purification bag placing box 14 and a second replacement box 19; through holes are formed in two sides of the inner wall of the purification unit, a first replacement box 13 and a second replacement box 19 are respectively located on two sides of the purification unit and are in sealed conduction with the through holes, a purification package placement box 14 is connected to the first replacement box 13 in a sliding mode, the interior of the second replacement box 19 and the through holes of the inner wall of the purification unit in a sliding mode, two cavities are formed in the purification package placement box 14, rotating shafts 11 are rotatably installed at the bottoms of two inner side walls of the cavities, spiral springs 12 are installed on the rotating shafts 11, the rotating shafts 11 are fixedly connected with one ends of clamping plates 7, purification plates 8 are located in the cavities and abut against the tops of the clamping plates 7, purification holes 9 are formed in the inner walls of the purification plates 8, and purification packages 10 are arranged at the tops of the purification plates 8; the inner walls of the first replacement box 13 and the second replacement box 19 and one end close to the purification unit are rotatably connected with two driving wheels 17, the two driving wheels 17 are oppositely arranged, the driving wheels 17 are driven by a driving belt 18, a sliding rod 15 is arranged at a gap between the two driving wheels 17, the sliding rod 15 is fixedly arranged on the outer side wall of the purification bag placing box 14, the inner top walls of the first replacement box 13 and the second replacement box 19 are respectively inserted with a first sealing plate 16, and the inner structures of the first replacement box 13 and the second replacement box 19 are the same; through the setting that the case 14 was placed to the purification package, can make the purification package 10 that is using and do not possess the purification package 10 that uses once more and change automatically, make slide bar 15 drive through rotating drive wheel 17 and purify the inside that the case 14 was placed to the package and be located the change case of difference, the inside of change case is changed and is purified package 10, the purification package of this device is placed case 14 and is provided with two cavitys for an intergral plate is inside, make when changing, the inside purification package 10 of two cavitys can follow alternate use, do not influence the normal operating of device, and guarantee the purifying effect of device, the purification package of this device is convenient for change, consequently, can purify to the gas of different gases and different concentrations.

As shown in fig. 1-2, the purifying unit includes a first purifying chamber 1, a first exhaust chamber 2, a second purifying chamber 3, a second exhaust chamber 4, a third purifying chamber 5, and a third exhaust chamber 6; the top of the first purifying cavity 1 is in fluid communication with the bottom of the first exhaust cavity 2, the top of the second purifying cavity 3 is in fluid communication with the bottom of the second exhaust cavity 4, the top of the third purifying cavity 5 is in fluid communication with the bottom of the third exhaust cavity 6, the space between the first exhaust cavity 2 and the second purifying cavity 3 and the space between the second exhaust cavity 4 and the third purifying cavity 5 are both connected and in fluid communication with a communicating pipe 35 and a circulating pipe 36, the outlet end of the communicating pipe 35 is respectively in sealed connection with the inlet ends of an exhaust pipe 38 and the circulating pipe 36, the circulating pipe 36 is provided with a first electromagnetic valve 37, the exhaust pipe 38 is provided with a second electromagnetic valve 39, the inlet end of the communicating pipe 35 is respectively fixedly connected and in fluid communication with the bottoms of the side walls of the first exhaust cavity 2, the second exhaust cavity 4 and the third exhaust cavity 6, the inner wall of the communicating pipe 35 is provided with a detector, and the detector is electrically connected with the first electromagnetic valve 37 and the second electromagnetic valve 39; the third exhaust cavity 6 is only provided with an exhaust pipe 36, the structure of each purification cavity is consistent with that of the inside of the exhaust cavity, and mutually independent gas filtering mechanisms are arranged, so that the gas can be filtered in a layered mode, and the gas can be purified fully.

As shown in fig. 2 and 4, an inner top wall of the first exhaust cavity 2 is fixedly connected with one end of a compression spring 20, the other end of the compression spring 20 is fixedly connected with one end surface of a lifting plate 21, the lifting plate 21 is slidably connected inside the first exhaust cavity 2, one end of the lifting plate 21, which is far away from the compression spring 20, is fixedly connected with the top of a fixed rod 23, a side wall of the fixed rod 23 is fixedly connected with one end of a slide box 28, the inner wall of the slide box 28 is provided with a slide groove 29 with an open side wall, the inside of the slide groove 29 is rotatably connected with a first lead screw 30, the outer wall of the first lead screw 30 is in threaded connection with a slide block 31, and one end of the first lead screw 30, which is far away from the fixed rod 23, is fixedly connected with an output end of a rotating motor; the bottom of the fixed rod 23 is fixedly connected with the outer wall of the fixed ring 24, the interior of the fixed ring 24 is rotatably connected with the rotary drum 25, one end face of the rotary drum 25 is fixedly provided with a first sliding plate 26, the other end face of the rotary drum 25 is fixedly provided with a second sliding plate 32, the first sliding plate 26 and the second sliding plate 32 are both obliquely arranged, the first sliding plate 26 is slidably connected in a strip-shaped groove in the groove plate 27, one end of the groove plate 27 is hinged on the outer wall of the sliding block 31, the second sliding plate 32 is slidably connected in the sliding disc 33, the bottom of the sliding disc 33 is fixedly provided with a second sealing plate 34, the second sealing plate 34 is slidably connected in the insertion plate 22, the insertion plate 22 is positioned between the first purifying cavity 1 and the first exhausting cavity 2, and the insertion plate 22 is positioned at the top of the purifying bag 10; through the setting of lifter plate 21, can make the air after the purification store, through detecting the back with qualified gas exhaust air, unqualified entering second through circulating pipe 36 purifies chamber 3 and carries out circulation purification once more, through the setting of rotary drum 25 and sliding plate 33, make when storing gas, second closing plate 34 seals second exhaust chamber 2, prevent that gas leakage from causing the pollution, and through the sealing of second closing plate 34, the filtering component that can be convenient for changes, prevent gaseous backward flow, cause the filtration difficulty, influence the filter effect.

As shown in fig. 2 and 5, the inside of the first purification chamber 1 is vertically and rotatably connected with a second lead screw 40, the top of the second lead screw 40 is rotatably connected inside a pore plate 49, the pore plate 49 is fixedly installed inside the first purification chamber 1, the pore plate 49 is abutted against the bottom of the purification bag placing box 14, one end of the second lead screw 40 is fixedly connected with the output end of a driving motor 41, the driving motor 41 is fixedly installed at the inner bottom of the first purification chamber 1, the outer wall of the second lead screw 40 is in threaded connection with a sliding block, the outer wall of the sliding block is provided with a bearing 42, and the bearing 42 is installed inside a push plate 43; an airflow channel 44 is formed in the inner wall of the push plate 43, a fixed plate 45 is mounted on the inner bottom wall of the airflow channel 44, airflow holes 46 are formed in the inner wall of the fixed plate 45, two baffles 47 are abutted to the top of the fixed plate 45, the two baffles 47 are hinged to the inner wall of the airflow channel 44 relatively, a limit stop 48 is fixedly mounted at the top of the inner side wall of the airflow channel 44, the limit stop 48 is located at the top of the baffle 47, and an exhaust gas inlet pipe 50 is inserted into the side wall of the first purification cavity 1; waste gas intake pipe 50 only has the outer wall of first purification chamber 1 to peg graft and have, setting through push pedal 43, can make the gas that will purify intracavity portion push completely to the inside in exhaust chamber, make the gas that purifies intracavity portion can purify through purifying package 10 completely, prevent that the residual has gaseous unpurified phenomenon, setting up through airflow channel 44 simultaneously can make push pedal 43 propelling movement gaseous after, follow-up gas gets into fast, be convenient for quick carry on filter gas upper portion and discharge the back, can make push pedal 43 descend and directly carry out the inside that extrusion air once more enters into exhaust chamber, make this device purify more fast, purifying effect is stronger.

The working principle is as follows: when the device is used for purification, waste gas firstly enters the first purification cavity 1 through the air inlet pipe 50, at the moment, the second lead screw 40 drives the sliding block to enable the push plate 43 to move upwards by starting the driving motor 41, at the moment, under the action of gravity and the pressure of the waste gas in the first purification cavity 1, sealing is realized between the baffle plate 47 and the airflow hole 46, the push plate 43 is completely extruded to enable the waste gas in the first purification cavity 1 to enter the purification bag 10 for purification through the pore plate 49 and the purification hole 9, and then enter the first exhaust cavity 2, in an initial state, a certain gap is reserved between the second sealing plate 34 and the plug plate 22, so that the filtered gas can enter the first exhaust cavity 2, at the moment, the compression spring 20 in the first exhaust cavity 2 is compressed, the lifting plate 21 moves upwards, and the fixed rod 23 is moved upwards, meanwhile, the fixing ring 24 drives the rotating drum 25 to move upwards, and the second sliding plate 32 is not placed obliquely, so that the sliding disc 33 moves, the second sealing plate 34 slides, so that the fluid hole between the first purifying chamber 1 and the first exhaust chamber 2 is enlarged, waste gas can enter rapidly, at the moment, the detector inside the communicating pipe 35 detects the filtered air, the first electromagnetic valve 37 is opened after the air is unqualified to enter the second purifying chamber 3, when the air is qualified, the second electromagnetic valve 39 is opened to discharge to the atmosphere, the second purifying chamber 3 purifies qualified air and discharges to the atmosphere, the unqualified air enters the third purifying chamber 5 to be purified again, after the air in the first exhaust chamber 2 is discharged, the lifting plate 21 moves downwards under the action of the compression spring 20, the second sealing plate 34 resets, and in order to adjust the original gap between the second sealing plate 34 and the plug-in plate 22, the rotating motor is started, the first lead screw 30 rotates the sliding block 31 to displace, the groove plate 27 rotates to enable the rotating drum 25 to rotate, further, the oblique angle of the second sliding plate 32 deflects, the displacement distance of the second sealing plate 34 changes when the lifting distance of the lifting plate 21 is fixed, the second sealing plate 34 can be completely inserted into the inner part of the plug-in board 22 by adjusting the oblique angle of the second sliding plate 32, the purification bag 10 is convenient to replace, the push plate 43 is abutted against the pore plate 49 to realize sealing, the gap between the pore plate 49 and the plug-in board 22 is in a sealing state, at the moment, the two driving wheels 17 rotate relatively by using the driving belt 18, the purification bag placing box 14 displaces, make the purification package 10 that the inside cavity of case 14 is placed to the purification package that is using enter into the inside that 19 was changed to the second, the inside cavity that the case 14 was placed to the purification package of first change case 13 enters into the inside of first purification chamber 1, make purification package 10 get changed, this moment through dismantling first closing plate 16, make the inside purification package 10 of second change case 19 change and then reserve, the purification package of this device places case 14 and is an integral board, inside two cavities, one is located the inside of first purification chamber 1, one is located the inside of first change case 13, it is convenient for change, push pedal 43 is descended because of its effect that receives the resistance, baffle 47 rotates, make air current hole 46 and airflow channel 44 be the conducting state, be convenient for the decline of push pedal 43, accelerate the processing of waste gas.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications are possible which remain within the scope of the appended claims.

Claims

1. A VOCs waste gas treatment device is characterized by comprising a purification unit, a purification plate (8), a first replacement box (13), a purification bag placing box (14) and a second replacement box (19); through holes are formed in two sides of the inner wall of the purification unit, the first replacement box (13) and the second replacement box (19) are respectively located on two sides of the purification unit and are in sealed conduction with the through holes, the purification package placement box (14) is connected to the interiors of the first replacement box (13) and the second replacement box (19) and the through holes in the inner wall of the purification unit in a sliding mode, two cavities are formed in the purification package placement box (14), rotating shafts (11) are rotatably mounted at the bottoms of two inner side walls of the cavities, scroll springs (12) are mounted on the rotating shafts (11), the rotating shafts (11) are fixedly connected with one ends of clamping plates (7), the purification plates (8) are located in the cavities and are abutted to the tops of the clamping plates (7), purification holes (9) are formed in the inner wall of the purification plates (8), and purification packages (10) are arranged at the tops of the purification plates (8);

one ends, close to the purifying unit, of the inner walls of the first replacing box (13) and the second replacing box (19) are rotatably connected with two driving wheels (17), the two driving wheels (17) are oppositely arranged, the driving wheels (17) are driven by a driving belt (18), a sliding rod (15) is arranged at a gap between the two driving wheels (17), the sliding rod (15) is fixedly arranged on the outer side wall of the purifying bag placing box (14), first sealing plates (16) are respectively inserted into the inner top walls of the first replacing box (13) and the second replacing box (19), and the structures of the inner parts of the first replacing box (13) and the second replacing box (19) are the same;

the purification unit comprises a first purification cavity (1), a first exhaust cavity (2), a second purification cavity (3), a second exhaust cavity (4), a third purification cavity (5) and a third exhaust cavity (6);

the top of the first purification cavity (1) is in fluid communication with the bottom of the first exhaust cavity (2), the top of the second purification cavity (3) is in fluid communication with the bottom of the second exhaust cavity (4), the top of the third purification cavity (5) is in fluid communication with the bottom of the third exhaust cavity (6), the first exhaust cavity (2) and the second purification cavity (3) and the second exhaust cavity (4) and the third purification cavity (5) are connected and in fluid communication through a communicating pipe (35) and a circulating pipe (36), the outlet end of the communicating pipe (35) is in sealed connection with the inlet ends of an exhaust pipe (38) and the circulating pipe (36), the circulating pipe (36) is provided with a first electromagnetic valve (37), the exhaust pipe (38) is provided with a second electromagnetic valve (39), the inlet end of the communicating pipe (35) is respectively in fixed connection with the bottoms of the side walls of the first exhaust cavity (2), the second exhaust cavity (4) and the third exhaust cavity (6), the inner wall of the communicating pipe (35) is electrically connected with the second electromagnetic valve (37), and the detector (39) is electrically connected with the second electromagnetic valve (39);

the inner top wall of the first exhaust cavity (2) is fixedly connected with one end of a compression spring (20), the other end of the compression spring (20) is fixedly connected with one end face of a lifting plate (21), the lifting plate (21) is connected to the inside of the first exhaust cavity (2) in a sliding mode, one end, far away from the compression spring (20), of the lifting plate (21) is fixedly connected with the top of a fixed rod (23), the side wall of the fixed rod (23) is fixedly connected with one end of a sliding box (28), the inner wall of the sliding box (28) is provided with a sliding groove (29) with an opened side wall, the inside of the sliding groove (29) is rotatably connected with a first lead screw (30), the outer wall of the first lead screw (30) is connected with a sliding block (31) in a threaded mode, and one end, far away from the fixed rod (23), of the first lead screw (30) is fixedly connected with the output end of a rotating motor;

the bottom of dead lever (23) and the outer wall fixed connection of solid fixed ring (24), the inside rotation of solid fixed ring (24) is connected with rotary drum (25), a terminal surface fixed mounting of rotary drum (25) has first slide (26), another terminal surface fixed mounting of rotary drum (25) has second slide (32), first slide (26) and second slide (32) all install to the slant, first slide (26) sliding connection is in the inside bar inslot of frid (27), the one end of frid (27) articulates on the outer wall of slider (31), second slide (32) sliding connection is in the inside of sliding disk (33), the bottom fixed mounting of sliding disk (33) has second closing plate (34), second closing plate (34) sliding connection is in the inside of plugboard (22), plugboard (22) are located between first purification chamber (1) and first row (2), plugboard (22) are located the top of purification package (10).

2. A VOCs waste gas treatment device according to claim 1, wherein a second lead screw (40) is vertically and rotatably connected to the inside of the first purification cavity (1), the top of the second lead screw (40) is rotatably connected to the inside of a pore plate (49), the pore plate (49) is fixedly installed inside the first purification cavity (1), the pore plate (49) abuts against the bottom of the purification bag placing box (14), one end of the second lead screw (40) is fixedly connected with the output end of a driving motor (41), the driving motor (41) is fixedly installed at the inner bottom of the first purification cavity (1), the outer wall of the second lead screw (40) is in threaded connection with a sliding block, a bearing (42) is installed on the outer wall of the sliding block, and the bearing (42) is installed inside a push plate (43);

the inner wall of the push plate (43) is provided with an airflow channel (44), a fixing plate (45) is installed on the inner bottom wall of the airflow channel (44), airflow holes (46) are formed in the inner wall of the fixing plate (45), baffle plates (47) are abutted to the top of the fixing plate (45), the number of the baffle plates (47) is two, the two baffle plates (47) are hinged to the inner wall of the airflow channel (44) relatively, a limit stop (48) is fixedly installed at the top of the inner side wall of the airflow channel (44), the limit stop (48) is located at the top of the baffle plates (47), and an exhaust gas inlet pipe (50) is inserted into the side wall of the first purification cavity (1).