Multistage circulating absorption device for glue-making formaldehyde tail gas in medium density fiberboard production

Abstract

The invention relates to the technical field of formaldehyde purification, and discloses a medium density fiberboard production glue-making formaldehyde tail gas multi-stage circulation absorption device which comprises a formaldehyde absorption device, an upper door is installed at the upper end of the formaldehyde absorption device, and two sets of side doors are installed at the position, close to the front side, of one end of the formaldehyde absorption device. A switching assembly is arranged on the inner side of the formaldehyde absorbing device, multi-stage filtering assemblies are arranged in the positions, close to the front and rear sides of the switching assembly, in the lower side of the formaldehyde absorbing device, and regeneration assemblies are arranged in the positions, close to the front and rear sides of the switching assembly, in the upper side of the formaldehyde absorbing device; the switching assembly comprises a switching shell fixedly arranged in the formaldehyde absorption device, and cavities are formed between the switching shell and the inner walls of the front side and the rear side of the formaldehyde absorption device. According to the multi-stage circulating absorption device for the formaldehyde tail gas generated in glue making in medium density fiberboard production, through overall cooperative use, pores of activated carbon are automatically flushed through high-temperature water vapor, and the activated carbon is fully utilized.

Description

Technical Field

[0001] The invention relates to the technical field of formaldehyde purification, and in particular to a multi-stage circulation absorption device for formaldehyde tail gas in the production of medium-density fiberboard and glue making. Background Art

[0002] The glue making process in the production of medium density fiberboard (MDF) may produce formaldehyde, so in the industrial production process, the gas produced is monitored and controlled by equipment and data acquisition software, and formaldehyde purification equipment is used to work, thereby improving the factory production environment. During the long-term adsorption process of formaldehyde purification equipment, the internal activated carbon filter structure will be saturated with adsorption, which is easy to cause secondary pollution.

[0003] In the past, the activated carbon filter structure was replaced with a new one. However, activated carbon has the property of regeneration, so direct replacement resulted in the activated carbon not being fully utilized.

[0004] Another common way to restore the activity of activated carbon is to recycle it and place it in an activation recovery furnace for heating to restore its activity, but this method is time-consuming and labor-intensive. Summary of the invention

[0005] The main purpose of the present invention is to provide a multi-stage circulation absorption device for formaldehyde tail gas in the production of medium-density fiberboard and glue making, which can effectively solve the problems in the background technology.

[0006] To achieve the above object, the technical solution adopted by the present invention is: A multi-stage circulation absorption device for formaldehyde tail gas in the production and glue making of medium-density fiberboard, comprising a formaldehyde absorption device, an upper door is installed on the upper end of the formaldehyde absorption device, two groups of side doors are installed at one end of the formaldehyde absorption device near the front side, a switching component is arranged on the inner side of the formaldehyde absorption device, a multi-stage filtering component is arranged inside the lower side of the formaldehyde absorption device near the front and rear sides of the switching component, a regeneration component is arranged inside the upper side of the formaldehyde absorption device near the front and rear sides of the switching component, the switching component comprises a switching shell fixedly arranged inside the formaldehyde absorption device, cavities are arranged between the switching shell and the front and rear inner walls of the formaldehyde absorption device, sliding cavities are arranged inside both sides of the switching shell, activated carbon filter plates are slidably arranged inside the two groups of the sliding cavities, connecting rods are threadedly connected at both ends of the two groups of the activated carbon filter plates near the upper side, a hollow cavity is arranged in the middle position of the switching shell, a first motor is fixedly arranged on the inner walls on both sides of the hollow cavity, a push rod is fixedly arranged on the rotating shaft of the first motor, and movable openings are opened at positions corresponding to the connecting rods at both ends of the switching shell.

[0007] Preferably, ventilation holes are provided inside the switching shell near the upper and lower sides, two groups of arc grooves are provided inside the switching shell near the outside of the two groups of ventilation holes, a telescopic tube is fixedly provided on the inner wall of the arc groove, a conical sleeve is fixedly provided on one side of the telescopic tube, and a reset spring is fixedly provided on the outer side of the telescopic tube near the conical sleeve and the inner wall of the arc groove.

[0008] Preferably, the multi-stage filtering assembly includes an air inlet pipe fixedly arranged at the front end of the switching shell near the lower side, two groups of filter boxes are fixedly arranged on the air inlet pipe, filter boxes are arranged on the inner sides of the two groups of filter boxes, an air outlet pipe is fixedly connected to the rear end of the switching shell near the lower side, a down fan is fixedly installed on the inner side of the air outlet pipe, and a filter net is fixedly arranged on the opposite end of the two groups of air inlet pipes to the air outlet pipes.

[0009] Preferably, the regeneration component includes a steam pipe fixedly arranged at the rear end of the switching shell near the upper side, an upper fan is fixedly installed on the inner side of the steam pipe, an air intake pipe is fixedly arranged on the upper side of the steam pipe, a first electric valve is installed on the upper side of the air intake pipe, an exhaust pipe is fixedly arranged at the front end of the switching shell near the upper side, a convex shell is arranged on the exhaust pipe, a rotating ring is rotatably arranged on the inner side of the convex shell, a toothed ring is arranged on the outer side of the rotating ring, a water-absorbing sponge is fixedly arranged on the inner side of the rotating ring, a second motor is fixedly arranged on the upper end of the exhaust pipe, a gear is fixedly arranged on the outer side of the rotating shaft of the water-absorbing sponge, a drain pipe is fixedly arranged at the lower end of the convex shell, a second electric valve is fixedly installed on the drain pipe, a circulation pipe is fixedly arranged at the front end of the exhaust pipe, and a third electric valve is fixedly installed on the circulation pipe.

[0010] Preferably, the connecting rod passes through the inner side of the movable opening into the cavity, the first motor passes through the inner wall of the hollow cavity, the push rod is located in the cavity, and the push rod is respectively sleeved on the outer side of the connecting rod on the two groups of activated carbon filter plates.

[0011] Preferably, the two groups of ventilation holes correspond to the center positions of the two groups of activated carbon filter plates respectively, the two groups of telescopic tubes arranged in the two groups of arc grooves are in stretched and contracted states respectively, one group of the two groups of conical sleeves fits the inner wall of one side of the sliding cavity, and the other group fits one end of the activated carbon filter plate, and one group of the two groups of reset springs is in a compressed state.

[0012] Preferably, the air inlet pipe and the air outlet pipe correspond to the front and rear sides of the lower ventilation port respectively, the air inlet pipe and the air outlet pipe are connected to the interior of the switching shell, the air inlet pipe and the air outlet pipe pass through the front and rear outer shells of the formaldehyde absorption device respectively, and the filter elements in the two groups of filter boxes correspond to the interior of the air inlet pipe.

[0013] Preferably, the steam pipe and the exhaust pipe are connected to the interior of the switching shell, the air inlet pipe passes through the formaldehyde absorption device and is connected to an external high-temperature steam generator, the exhaust pipe, the circulation pipe and the air inlet pipe are connected to the interior, an opening is provided at the position of the gear on the upper side of the convex shell, an overflow hole is provided on the rotating ring, the gear is meshed with the toothed ring, the drain pipe is connected to the interior of the convex shell, and the drain pipe passes through the lower side of the formaldehyde absorption device.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The downwind fan works to extract the formaldehyde exhaust gas from the production of medium-density fiberboard and glue and enter the air inlet duct. The air containing formaldehyde is initially filtered through two sets of filter boxes to isolate large particles in the air. By opening the two sets of side doors, the two sets of filter boxes can be opened and the filter boxes placed inside can be replaced. The air after the initial filtration then enters the switching component to filter the formaldehyde in the air, and then the purified air is discharged from the air outlet duct, thereby purifying the air in the factory and avoiding harm to the workers' health. When the activated carbon filter plate on the lower side is saturated, the two groups of first motors drive the two groups of push rods to rotate clockwise in the front and rear cavities respectively, and the push rods lift the front activated carbon filter plate upward along the movable opening through the two groups of connecting rods to the corresponding upper vents. On the contrary, the activated carbon filter plate on the rear side is pushed down by the push rods to the corresponding lower vents, thereby realizing the switching of the two groups of vents, improving the filtration efficiency, and facilitating maintenance and regeneration. When the two sets of activated carbon filter plates move, they will contact the conical sleeve, push the conical sleeve to move into the arc groove, squeeze the reset spring, and retract the telescopic tube at the same time, while the compressed reset spring on the other side will push the connected conical sleeve out of the arc groove. When the two sets of activated carbon filter plates are switched, the telescopic tubes on both sides respectively fit the activated carbon filter plates and the inner wall of the switching shell for sealing to prevent airflow leakage. When activated carbon regeneration is required, a high-temperature steam generator connected to the air inlet pipe generates high-temperature steam that enters the steam pipe, and the fan blows the steam toward the upper activated carbon filter plate, thereby utilizing the high-temperature steam "100 to 150°C" to automatically flush the activated carbon pores and make full use of them. During the blowing process, the water vapor and formaldehyde gas behind the activated carbon filter plate are respectively adsorbed by the water absorbent sponge, and then the gear is driven by the second motor to rotate, so that the water absorbed by the water absorbent sponge is thrown out and discharged to the outside through the drain pipe and the second electric valve, so that the water absorbent sponge can continue to perform the adsorption work. When the high-temperature steam generator is stopped, the fan can be quickly turned off, and the use of the circulation pipe and the third electric valve can discharge the gas containing formaldehyde into the air inlet pipe again to complete the purification process and avoid direct discharge to affect the external environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of a multi-stage circulation absorption device for formaldehyde tail gas in the production and glue making of medium-density fiberboard according to the present invention; Figure 2 It is a side view structural schematic diagram of a multi-stage circulation absorption device for formaldehyde tail gas in the production and glue making of medium-density fiberboard according to the present invention; Figure 3 This is a schematic diagram of the internal structure of a multi-stage circulating absorption device for formaldehyde tail gas in the production of medium-density fiberboard according to the present invention; Figure 4 It is a partial structural schematic diagram of a multi-stage circulating absorption device for formaldehyde tail gas in the production of medium-density fiberboard according to the present invention; Figure 5 It is a schematic cross-sectional structure diagram of a switching component of a multi-stage circulating absorption device for formaldehyde tail gas in the production and glue making of medium-density fiberboard according to the present invention; Figure 6 It is a partial structural schematic diagram of a switching component of a multi-stage circulating absorption device for formaldehyde tail gas in the production and glue making of medium-density fiberboard according to the present invention; Figure 7 The invention relates to a multi-stage circulation absorption device for formaldehyde tail gas in the production of medium fiberboard and glue making. Figure 6 A schematic diagram of the enlarged structure of the middle part A; Figure 8 The present invention is a schematic diagram of the internal structure of a regeneration component of a multi-stage circulation absorption device for formaldehyde tail gas in the production of medium-density fiberboard.

[0016] In the figure: 1, formaldehyde absorption device; 2, upper door; 3, side door; 4, switching assembly; 41, switching shell; 42, cavity; 43, sliding cavity; 44, activated carbon filter plate; 45, connecting rod; 46, hollow cavity; 47, first motor; 48, push rod; 49, movable opening; 410, vent; 411, arc groove; 412, telescopic tube; 413, conical sleeve; 414, reset spring; 5, multi-stage filter assembly; 51, air inlet pipe; 52, filter box; 53, filter box; 54, air outlet pipe; 55, lower fan; 56, filter; 6, regeneration component; 61, steam pipe; 62, upper fan; 63, air inlet pipe; 64, first electric valve; 65, exhaust pipe; 66, convex shell; 67, rotating ring; 68, toothed ring; 69, water-absorbing sponge; 610, second motor; 611, gear; 612, drain pipe; 613, second electric valve; 614, circulation pipe; 615, third electric valve. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0018] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are relative relationships of directions or positions, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0019] See also Figure 1-Figure 8 The present invention provides an embodiment: a multi-stage circulation absorption device for formaldehyde tail gas in the production of medium fiberboard and glue, comprising a formaldehyde absorption device 1, an upper door 2 is installed on the upper end of the formaldehyde absorption device 1, two sets of side doors 3 are installed near the front side of one end of the formaldehyde absorption device 1, a switching component 4 is arranged on the inner side of the formaldehyde absorption device 1, a multi-stage filtering component 5 is arranged near the front and rear sides of the switching component 4 on the lower side of the formaldehyde absorption device 1, a regeneration component 6 is arranged near the front and rear sides of the switching component 4 on the upper side of the formaldehyde absorption device 1, and the switching component 4 includes a switching component 4 fixedly arranged inside the formaldehyde absorption device 1. A cavity 42 is provided between the switching shell 41 and the inner walls of the front and rear sides of the formaldehyde absorption device 1, sliding cavities 43 are provided inside both sides of the switching shell 41, activated carbon filter plates 44 are slidably provided inside the two groups of sliding cavities 43, and connecting rods 45 are threadedly connected to both ends of the two groups of activated carbon filter plates 44 near the upper side. A hollow cavity 46 is provided in the middle of the switching shell 41, and first motors 47 are fixedly provided on the inner walls of both sides of the hollow cavity 46, and a push rod 48 is fixedly provided on the rotating shaft of the first motor 47, and movable openings 49 are provided at the positions corresponding to the connecting rods 45 at both ends of the switching shell 41.

[0020] Among them, the connecting rod 45 passes through the inner side of the movable opening 49 to the cavity 42, the first motor 47 passes through the inner wall of the hollow cavity 46, the push rod 48 is located in the cavity 42, and the push rod 48 is respectively sleeved on the outer side of the connecting rod 45 on the two groups of activated carbon filter plates 44.

[0021] With such arrangement, when the activated carbon filter plate 44 on the lower side is saturated, the two groups of first motors 47 respectively drive the two groups of push rods 48 to rotate clockwise in the front and rear cavities 42, and the push rods 48 lift the front activated carbon filter plate 44 upward along the movable opening 49 through the two groups of connecting rods 45 to the corresponding upper vent 410. On the contrary, the activated carbon filter plate 44 on the rear side is pushed down by the push rods 48 to the corresponding lower vent 410, thereby realizing the switching operation of the two groups of vents 410, improving the filtration efficiency, and facilitating maintenance and regeneration processing.

[0022] See also Figures 5 to 7Ventilation holes 410 are provided inside the switching shell 41 near the upper and lower sides, and two groups of arc grooves 411 are provided inside the switching shell 41 near the outside of the two groups of ventilation holes 410. A telescopic tube 412 is fixedly provided on the inner wall of the arc groove 411, and a conical sleeve 413 is fixedly provided on one side of the telescopic tube 412. A return spring 414 is fixedly provided on the outer side of the telescopic tube 412 near the conical sleeve 413 and the inner wall of the arc groove 411.

[0023] Among them, the two groups of ventilation holes 410 correspond to the center positions of the two groups of activated carbon filter plates 44 respectively, the two groups of telescopic tubes 412 arranged in the two groups of arc grooves 411 are in the stretched and contracted states respectively, one of the two groups of conical sleeves 413 fits the inner wall of one side of the sliding cavity 43, and the other group fits one end of the activated carbon filter plate 44, and one of the two groups of reset springs 414 is in the compressed state.

[0024] With such arrangement, the two groups of activated carbon filter plates 44 will contact the conical sleeve 413 while moving, pushing the conical sleeve 413 to move into the arc groove 411, squeezing the return spring 414, and retracting the telescopic tube 412 at the same time, while the compressed return spring 414 on the other side pushes the connected conical sleeve 413 out of the arc groove 411, so that when the two groups of activated carbon filter plates 44 are switched, the telescopic tubes 412 on both sides respectively adhere to the activated carbon filter plates 44 and the inner wall of the switching shell 41 for sealing to prevent airflow leakage.

[0025] See also Figure 3 to Figure 4 The multi-stage filtering component 5 includes an air inlet pipe 51 fixedly arranged at the front end of the switching shell 41 near the lower side, two groups of filter boxes 52 are fixedly arranged on the air inlet pipe 51, and filter boxes 53 are arranged on the inner sides of the two groups of filter boxes 52. An air outlet pipe 54 is fixedly connected to the rear end of the switching shell 41 near the lower side, and a down fan 55 is fixedly installed on the inner side of the air outlet pipe 54. A filter screen 56 is fixedly arranged at the opposite end of the two groups of air inlet pipes 51 to the air outlet pipe 54.

[0026] Among them, the air inlet pipe 51 and the air outlet pipe 54 correspond to the front and rear sides of the lower ventilation port 410 respectively, the air inlet pipe 51 and the air outlet pipe 54 are connected to the interior of the switching shell 41, the air inlet pipe 51 and the air outlet pipe 54 pass through the front and rear side outer shells of the formaldehyde absorption device 1 respectively, and the filter elements in the two groups of filter boxes 53 correspond to the interior of the air inlet pipe 51.

[0027] With such arrangement, the down fan 55 is operated to extract the formaldehyde exhaust gas in the production of medium-density fiberboard and the formaldehyde exhaust gas enters the interior of the air inlet pipe 51, and the air containing formaldehyde is initially filtered through two sets of filter boxes 53 to isolate large particles in the air. By opening the two sets of side doors 3, the two sets of filter boxes 52 can be opened to replace the filter boxes 53 placed inside, and the air after the initial filtration subsequently enters the switching component 4 to filter the formaldehyde in the air, and then the purified air is discharged from the air outlet pipe 54, so as to purify the air in the factory and avoid harm to the workers' bodies.

[0028] See also Figure 3 , Figure 4 , Figure 8 The regeneration component 6 includes a steam pipe 61 fixedly arranged at the rear end of the switching shell 41 near the upper side, an upper fan 62 is fixedly installed inside the steam pipe 61, an air intake pipe 63 is fixedly arranged on the upper side of the steam pipe 61, and a first electric valve 64 is installed on the upper side of the air intake pipe 63; an exhaust pipe 65 is fixedly arranged at the front end of the switching shell 41 near the upper side, a convex shell 66 is arranged on the exhaust pipe 65, a rotating ring 67 is rotatably arranged inside the convex shell 66, a toothed ring 68 is arranged on the outer side of the rotating ring 67, a water-absorbing sponge 69 is fixedly arranged on the inner side of the rotating ring 67, a second motor 610 is fixedly arranged on the upper end of the exhaust pipe 65, a gear 611 is fixedly arranged on the outer side of the rotating shaft of the water-absorbing sponge 69, a drain pipe 612 is fixedly arranged at the lower end of the convex shell 66, a second electric valve 613 is fixedly installed on the drain pipe 612, a circulation pipe 614 is fixedly arranged at the front end of the exhaust pipe 65, and a third electric valve 615 is fixedly installed on the circulation pipe 614.

[0029] Among them, the steam pipe 61 and the exhaust pipe 65 are connected to the interior of the switching shell 41, the air inlet pipe 63 passes through the formaldehyde absorption device 1 and is connected to an external high-temperature steam generator, the exhaust pipe 65, the circulation pipe 614, and the air inlet pipe 51 are connected to each other, an opening is provided on the upper side of the convex shell 66 corresponding to the position of the gear 611, the rotating ring 67 is provided with an overflow hole, the gear 611 is meshed with the toothed ring 68, the drain pipe 612 is connected to the interior of the convex shell 66, and the drain pipe 612 passes through the lower side of the formaldehyde absorption device 1.

[0030] With such arrangement, when activated carbon regeneration is required, high-temperature steam is generated by the high-temperature steam generator connected to the air inlet pipe 63, and enters the steam pipe 61. The steam is blown to the upper activated carbon filter plate 44 by the blower 62, so that the activated carbon pores are automatically flushed with the high-temperature steam "100 to 150°C", and the activated carbon pores are fully utilized. In the blowing process, the water vapor and the formaldehyde gas contained in the activated carbon filter plate 44 are respectively adsorbed by the water-absorbing sponge 69, and then the gear 611 is driven to rotate by the second motor 610 to throw out the water source absorbed by the water-absorbing sponge 69, and discharged to the outside through the drain pipe 612 and the second electric valve 613, so that the water-absorbing sponge 69 can continue to perform the adsorption work. When the high-temperature steam generator is stopped, the fan 62 can be quickly turned off, and the use of the circulation pipe 614 and the third electric valve 615 can discharge the gas containing formaldehyde from the air inlet pipe 51 again to complete the purification process and avoid direct discharge to affect the external environment.

[0031] Working principle: When in use, the lower fan 55 is operated to extract the formaldehyde tail gas in the production of medium-density fiberboard and enter the interior of the air inlet pipe 51. The air containing formaldehyde is filtered through two sets of filter boxes 53 respectively to isolate large particles in the air. By opening the two sets of side doors 3, the two sets of filter boxes 52 can be opened to replace the filter boxes 53 placed inside. The air after the initial filtration then enters the switching component 4 to filter the formaldehyde in the air, and then the purified air is discharged from the air outlet pipe 54 to purify the air in the factory and avoid harm to the workers' bodies. When the activated carbon filter plate 44 on the lower side is saturated, it passes through the two sets of filter boxes 53 to filter the formaldehyde in the air. The first motor 47 drives the two groups of push rods 48 to rotate clockwise in the front and rear cavities 42 respectively. The push rods 48 lift the front activated carbon filter plate 44 upward along the movable opening 49 through the two groups of connecting rods 45 to the corresponding upper vent 410. On the contrary, the rear activated carbon filter plate 44 is pushed down by the push rods 48 to the corresponding lower vent 410, so that the two groups of vents 410 can be switched, thereby improving the filtration efficiency and facilitating maintenance and regeneration. The other two groups of activated carbon filter plates 44 will contact the conical sleeve 413 while moving, pushing the conical sleeve 413 to move into the arc groove 411, squeezing the reset spring 414, and at the same time retracting the telescopic tube 412. The return spring 414 compressed on the other side pushes the connected conical sleeve 413 out of the arc groove 411, so that when the two sets of activated carbon filter plates 44 are switched, the telescopic tubes 412 on both sides respectively adhere to the activated carbon filter plates 44 and the inner wall of the switching shell 41 for sealing to prevent airflow leakage; when activated carbon regeneration is required, the high-temperature steam generator connected to the air inlet pipe 63 generates high-temperature steam to enter the steam pipe 61, and the upper fan 62 blows the steam to the upper activated carbon filter plate 44, so that the high-temperature water vapor "100 to 150 ℃" is used to automatically flush the activated carbon pores, and the activated carbon is fully utilized. The water vapor and the formaldehyde gas contained therein after the activated carbon filter plate 44 are respectively adsorbed by the water-absorbing sponge 69, and then the gear 611 is driven to rotate by the second motor 610 to throw out the water source absorbed by the water-absorbing sponge 69, and discharged to the outside through the drain pipe 612 and the second electric valve 613, so that the water-absorbing sponge 69 can continue to perform the adsorption work, and then when the high-temperature steam generator is stopped, the fan 62 can be quickly turned off, and the use of the circulation pipe 614 and the third electric valve 615 can discharge the gas containing formaldehyde into the air inlet pipe 51 again to complete the purification process and avoid direct discharge to affect the external environment.

[0032] The electrical components of the formaldehyde absorption device 1, activated carbon filter plate 44, first motor 47, telescopic tube 412, filter box 53, down fan 55, up fan 62, first electric valve 64, second motor 610, second electric valve 613 and third electric valve 615 in the present invention are existing structures in the field, and the usage and connection methods are common knowledge in the field. The working principle is already a well-known technology, and the model is selected according to the actual use, so it will not be explained in detail.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-stage circulation absorption device for formaldehyde tail gas in the production of medium fiberboard and glue, comprising a formaldehyde absorption device (1), characterized in that: An upper door (2) is installed at the upper end of the formaldehyde absorption device (1); two sets of side doors (3) are installed at one end of the formaldehyde absorption device (1) near the front; a switching component (4) is arranged inside the formaldehyde absorption device (1); a multi-stage filtering component (5) is arranged inside the lower side of the formaldehyde absorption device (1) near the front and rear sides of the switching component (4); a regeneration component (6) is arranged inside the upper side of the formaldehyde absorption device (1) near the front and rear sides of the switching component (4); the switching component (4) comprises a switching shell (41) fixedly arranged inside the formaldehyde absorption device (1); the switching shell (41) and the front and rear sides of the formaldehyde absorption device (1) are connected to each other. A cavity (42) is provided between the inner walls, a sliding cavity (43) is provided inside both sides of the switching shell (41), an activated carbon filter plate (44) is slidably provided inside the two groups of sliding cavities (43), connecting rods (45) are threadedly connected to both ends of the two groups of activated carbon filter plates (44) near the upper side, a hollow cavity (46) is provided in the middle of the switching shell (41), a first motor (47) is fixedly provided on the inner walls of both sides of the hollow cavity (46), a push rod (48) is fixedly provided on the rotating shaft of the first motor (47), and movable openings (49) are provided at positions corresponding to the connecting rod (45) at both ends of the switching shell (41).

2. The multi-stage circulation absorption device for formaldehyde tail gas in the production of medium fiberboard according to claim 1, characterized in that: Ventilation holes (410) are arranged inside the switching shell (41) near the upper and lower sides, and two groups of arc-shaped grooves (411) are arranged inside the switching shell (41) near the outside of the two groups of ventilation holes (410). A telescopic tube (412) is fixedly arranged on the inner wall of the arc-shaped groove (411), a conical sleeve (413) is fixedly arranged on one side of the telescopic tube (412), and a return spring (414) is fixedly arranged on the outer side of the telescopic tube (412) between the conical sleeve (413) and the inner wall of the arc-shaped groove (411).

3. The multi-stage circulation absorption device for formaldehyde tail gas in the production of medium fiberboard according to claim 1, characterized in that: The multi-stage filter assembly (5) comprises an air inlet pipe (51) fixedly arranged at a front end of the switching shell (41) near the lower side, two groups of filter boxes (52) fixedly arranged on the air inlet pipe (51), the inner sides of the two groups of filter boxes (52) are both provided with filter boxes (53), an air outlet pipe (54) fixedly connected to a rear end of the switching shell (41) near the lower side, a down fan (55) fixedly installed on the inner side of the air outlet pipe (54), and a filter screen (56) fixedly arranged at the ends of the two groups of air inlet pipes (51) opposite to the air outlet pipe (54).

4. The multi-stage circulation absorption device for formaldehyde tail gas in the production of medium fiberboard according to claim 1, characterized in that: The regeneration component (6) comprises a steam pipe (61) fixedly arranged at a rear end of the switching shell (41) near an upper side, an upper fan (62) fixedly installed inside the steam pipe (61), an air intake pipe (63) fixedly arranged at an upper side of the steam pipe (61), a first electric valve (64) installed at an upper side of the air intake pipe (63), an exhaust pipe (65) fixedly arranged at a front end of the switching shell (41) near an upper side, a convex shell (66) arranged on the exhaust pipe (65), a rotating ring (67) rotatably arranged inside the convex shell (66), and the rotating ring (67) A toothed ring (68) is arranged on the outside, a water-absorbing sponge (69) is fixedly arranged on the inside of the rotating ring (67), a second motor (610) is fixedly arranged on the upper end of the exhaust pipe (65), a gear (611) is fixedly arranged on the outer side of the rotating shaft of the water-absorbing sponge (69), a liquid discharge pipe (612) is fixedly arranged on the lower end of the convex shell (66), a second electric valve (613) is fixedly mounted on the liquid discharge pipe (612), a circulation pipe (614) is fixedly arranged on the front end of the exhaust pipe (65), and a third electric valve (615) is fixedly mounted on the circulation pipe (614).

5. The multi-stage circulation absorption device for formaldehyde tail gas in the production of medium fiberboard according to claim 1, characterized in that: The connecting rod (45) passes through the inner side of the movable opening (49) to the cavity (42); the first motor (47) passes through the inner wall of the hollow cavity (46); the push rod (48) is located in the cavity (42); and the push rod (48) is respectively sleeved on the outer side of the connecting rod (45) on the two sets of activated carbon filter plates (44).

6. The multi-stage circulation absorption device for formaldehyde tail gas in the production of medium fiberboard according to claim 2, characterized in that: The two groups of ventilation holes (410) correspond to the center positions of the two groups of activated carbon filter plates (44), respectively; the two groups of telescopic tubes (412) provided in the two groups of arc-shaped grooves (411) are in a stretched state and a contracted state, respectively; one of the two groups of conical sleeves (413) fits against the inner wall of one side of the sliding cavity (43), and the other fits against one end of the activated carbon filter plate (44); and one of the two groups of return springs (414) is in a compressed state.

7. The multi-stage circulation absorption device for formaldehyde tail gas in the production of medium fiberboard according to claim 3, characterized in that: The air inlet pipe (51) and the air outlet pipe (54) correspond to the front and rear sides of the lower ventilation opening (410) respectively; the air inlet pipe (51) and the air outlet pipe (54) are in communication with the interior of the switching shell (41); the air inlet pipe (51) and the air outlet pipe (54) pass through the front and rear outer shells of the formaldehyde absorption device (1) respectively; and the filter elements in the two groups of filter boxes (53) correspond to the interior of the air inlet pipe (51).

8. The multi-stage circulation absorption device for formaldehyde tail gas in the production of medium fiberboard according to claim 4, characterized in that: The steam pipe (61) and the exhaust pipe (65) are in communication with the interior of the switching shell (41); the air intake pipe (63) passes through the formaldehyde absorption device (1) and is connected to an external high-temperature steam generator; the exhaust pipe (65), the circulation pipe (614), and the air intake pipe (51) are in communication with each other; an opening is provided on the upper side of the convex shell (66) at a position corresponding to the gear (611); the rotating ring (67) is provided with a water overflow hole; the gear (611) is meshed with the toothed ring (68); the liquid discharge pipe (612) is in communication with the interior of the convex shell (66); and the liquid discharge pipe (612) passes through the lower side of the formaldehyde absorption device (1).

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