A formaldehyde adsorption treatment device for polyurethane adhesive production

Abstract

This invention belongs to the field of formaldehyde separation and treatment technology, and discloses a formaldehyde adsorption treatment device for polyurethane adhesive production. The device includes an adsorption chamber with an air inlet on one side and an air outlet on the other side. Several support plates are fixed to the side wall of the adsorption chamber. Through the combination of fan blades and arc-shaped plates, an air curtain is blown out using inclined and circular arc-shaped plates, effectively promoting the stratified diffusion of formaldehyde gas. The airflow is evenly directed towards the filter cartridge cross-section, causing the filter cartridge to rotate. The fan blades on the upper and lower sides also rotate accordingly, promoting airflow at both ends of the adsorption chamber and preventing the formation of angular vortices in the upper and lower corners of the air inlet area. Simultaneously, the direction of the circular arc-shaped plates can be adjusted, such as switching from an upward to a downward angle, allowing for full adsorption on both sides of the adsorption bed, thereby improving the adsorption efficiency of activated carbon and increasing the overall rate.

Description

Technical Field

[0001] This invention belongs to the field of formaldehyde separation and treatment technology, specifically a formaldehyde adsorption and treatment device for polyurethane adhesive production. Background Technology

[0002] Polyurethane adhesives exhibit excellent bonding properties to a wide variety of materials, including metals, rubber, glass, ceramics, plastics, wood, fabrics, and leather, achieving strong adhesion. Therefore, they are widely used. However, during the production process of polyurethane adhesives, especially in the reaction, molding, and curing stages, waste gas containing volatile organic compounds such as formaldehyde is generated. Formaldehyde is highly irritating and a recognized carcinogen, thus requiring specialized equipment for effective treatment. Formaldehyde treatment equipment used in polyurethane adhesive production typically employs fixed-bed adsorbent technology, utilizing porous adsorbents such as activated carbon to physically or chemically adsorb harmful substances like formaldehyde from the waste gas, thereby purifying the gas.

[0003] The prior art document, CN219111242U, discloses a formaldehyde treatment device for the production of water-based adhesives, belonging to the technical field of formaldehyde treatment equipment. It includes a first housing with a fan chamber inside, and a fan inside the fan chamber. The device comprises an air intake head, a connecting mechanism, a fan, a filter assembly, and activated carbon particles. During use, the air intake head is fixed to the bottom of the water-based adhesive preparation tank via the connecting mechanism, allowing the discharge pipe at the bottom of the preparation tank to pass through a hole in the middle of the air intake head. When filling, the fan is activated to draw formaldehyde volatilized from the discharge pipe into the distribution box through the air intake head, the first inlet pipe, and the second inlet pipe. The formaldehyde is then distributed to the activated carbon particles inside the filter assembly for adsorption treatment before being discharged through the exhaust pipe. This device allows for targeted treatment of the water-based adhesive filling location, improving the accuracy of formaldehyde treatment.

[0004] Although the above-mentioned device is designed with formaldehyde adsorption, there are dead zones in the activated carbon bed stored in the box during adsorption. This leads to uneven airflow distribution inside the box, which can easily form short circuits or eddies. In particular, the four inner corners of the adsorption box, especially the upstream and downstream corners in the airflow direction, are prone to short circuits or eddies when the mainstream airflow passes through right angles. Due to the viscosity of the fluid, the gas in the corners hardly moves and separates from the mainstream, forming stable corner eddies. As a result, the activated carbon in these areas does not participate fully in adsorption, which reduces the overall purification efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a formaldehyde adsorption treatment device for polyurethane adhesive production that improves the adsorption efficiency of activated carbon and extends the service life of the entire filter element, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a formaldehyde adsorption treatment device for polyurethane adhesive production, comprising an adsorption chamber, an air inlet on one side of the adsorption chamber, an air outlet on the other side of the adsorption chamber, several support plates fixedly connected to the side wall of the adsorption chamber, a door rotatably connected to the support plates, several filter cartridges arranged longitudinally inside the adsorption chamber near the air inlet, and multiple adsorption beds arranged equidistantly on the sides of the filter cartridges, further comprising:

[0007] A graded adsorption mechanism, wherein the graded adsorption mechanism is located inside the adsorption chamber;

[0008] A diversion mechanism is connected to the adsorption box;

[0009] The graded adsorption mechanism includes multiple triangular rotating shafts rotatably connected to the inner wall of the adsorption chamber, each of which is fitted with a double-sided ferrule. Formaldehyde gas enters the adsorption chamber through the inlet, passes through the filter cartridge and adsorption bed in sequence, and then exits through the outlet. The formaldehyde is graded and adsorbed through the primary and secondary filter layers inside the filter cartridge and adsorption bed, thereby improving the cleanliness of the gas finally emitted from the outlet. The activated carbon filled in the filter cartridge has a relatively large pore size, which can effectively adsorb dust, water droplets, aerosols, and large molecular organic matter that may remain in the previous pretreatment step.

[0010] Preferably, the graded adsorption mechanism further includes a vertical plate abutting against the side wall of the adsorption box. The upper and lower ends of the vertical plate are both clamped to the edge of the adsorption box by locking posts. Several supports are fixedly connected to the inner side of the adsorption box and the support plate. The top of each support is slidably connected to the adsorption bed through a groove.

[0011] Preferably, both ends of the double-sided retaining sleeves on the upper and lower sides are fixedly connected to inner retaining plates, and several fan blades are fixedly connected at equal intervals to the side walls of the inner retaining plates. The ends of the fan blades are fixedly connected to the double-sided retaining sleeves. After being blown by the air curtain, the filter cartridges on the upper and lower sides rotate, and the fan blades at both ends of the double-sided retaining sleeves can ensure the stable rotation of the filter cartridges. In addition, the fan blades can also drive the airflow at the right angles at the upper and lower ends of the adsorption box, avoiding the formation of corner vortices in the corners of the air inlet area of ​​the adsorption box, thereby allowing the airflow to fully flow to the corners of the adsorption bed and improving the full adsorption of activated carbon.

[0012] Preferably, the upper and lower sides of the support plate are fixed with arc-shaped plates, the curvature of the arc-shaped plates is consistent with the outer diameter of the double-sided ferrule, and the width of the arc-shaped plates is consistent with the width of the fan blade.

[0013] Preferably, the inner cavity of the filter cartridge is filled with a primary filter layer, the inner cavity of the adsorption bed is filled with a secondary filter layer, and the height of the arc-shaped plate is greater than the height of the secondary filter layer. Since the width of the arc-shaped plate is the same as the width of the fan blade, and the height of the arc-shaped plate is greater than the height of the secondary filter layer, the arc-shaped plate can block the area of ​​the adsorption bed to prevent the fan blade from driving the local airflow to repeat adsorption, thus ensuring that the airflow can flow evenly to all corners of the adsorption bed.

[0014] Preferably, the diversion mechanism includes a sealing plate fixed to the inner cavity of the adsorption box, and a guide plate is fixed to the side of the sealing plate near the air inlet.

[0015] Preferably, the guide plate and the sealing plate are provided with a circular arc groove in the middle, and a circular arc tapering plate is slidably connected between them through the circular arc groove. After the formaldehyde gas enters the adsorption box, it first reaches the side area of ​​the sealing plate, and then disperses into the inclined tapering plate and the circular arc tapering plate through the diversion groove and the circular arc groove. The formaldehyde gas flows through the tapering space, which can increase the flow rate. When it is discharged, it forms an air curtain. The ends of the inclined tapering plates are all inclined towards the surface of the filter cartridge. Therefore, the air curtain continuously cuts and blows on the surface of the filter cartridge, which can make the filter cartridge rotate automatically and adsorb impurities in the gas from all directions.

[0016] Preferably, the sealing plate has flow dividers at both the top and bottom ends, and a pair of inclined tapering plates are fixedly connected to both ends of the sidewall of the sealing plate through the flow dividers, with the ends of the pair of inclined tapering plates inclined toward the surface of the filter cartridge.

[0017] Preferably, an electric push rod is fixedly connected to the edge of the guide plate, a sliding plate is fixedly connected to the output end of the electric push rod, a fixed column is movably connected inside the sliding plate, the end of the fixed column is fixedly connected to the arc tapering plate, and heat dissipation holes are provided on the outer wall of the adsorption box.

[0018] Preferably, both sides of the inner cavity of the arc-shaped tapered plate are fixed with cylindrical rotating shafts via fixing plates, and both ends of the cylindrical rotating shafts are rotatably connected to the adsorption box. The arc-shaped tapered plate in the middle can be rotated to adjust the air outlet angle. When the electric push rod moves the sliding plate upward, the outlet air curtain of the arc-shaped tapered plate obliquely cuts upward on the surface of the middle filter cartridge. At this time, the rotation direction of the middle filter cartridge is the same as the rotation direction of the lower filter cartridge. Conversely, if the outlet air curtain of the arc-shaped tapered plate is adjusted to obliquely cut downward on the surface of the filter cartridge, the rotation direction of the middle filter cartridge is opposite and the rotation direction of the upper filter cartridge is the same. This allows the double sides of the middle adsorption bed to fully adsorb formaldehyde, further improving the activated carbon utilization efficiency of the adsorption bed. After the formaldehyde gas is initially adsorbed from the filter cartridge, it is re-adsorbed on the adsorption bed. The formaldehyde gas passes through the microporous activated carbon of the secondary filter layer, which can extend the replacement cycle of the entire filter element.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] This invention, through the combination of fan blades and arc-shaped plates, utilizes inclined and circular arc-shaped reducing plates to guide the airflow and create an air curtain, effectively promoting the stratified diffusion of formaldehyde gas. The airflow is evenly directed towards the cross-section of the filter cartridge, causing the cartridge to rotate. The fan blades on the upper and lower sides also rotate accordingly. The fan blades promote airflow at both ends of the adsorption chamber, preventing the formation of angular vortices in the upstream and downstream corners of the air inlet area. The arc-shaped plates shield the adsorption bed area, preventing the fan blades from driving local airflow for repeated adsorption, ensuring that the airflow can flow evenly to all corners of the adsorption bed. At the same time, the direction of the circular arc-shaped reducing plates can be adjusted, such as switching from an upward to a downward angle, allowing both sides of the adsorption bed to fully adsorb, thereby improving the adsorption efficiency of activated carbon and increasing the overall rate.

[0021] This invention utilizes a combination design of filter cartridges and adsorption beds to achieve staged adsorption. The filter cartridges, acting as the primary filtration layer, reduce formaldehyde concentration and effectively intercept dust, water droplets, aerosols, and large organic molecules, preventing impurities from entering the dense-pore secondary filtration layer of the fixed bed and avoiding blockage of micropores that could reduce adsorption efficiency. The loose structure of the activated carbon in the filter cartridges reduces airflow resistance, protects the highly efficient dense-pore activated carbon, and reduces the impact of waste gas on the secondary filtration layer through buffering, maintaining stable system operation. Furthermore, the filter cartridges are easy to replace, extending the service life of the entire filter element and reducing operating costs. When treating high-formaldehyde waste gas from polyurethane production, the system fully leverages the synergistic effect of the primary filtration of the filter cartridges and the secondary filtration of the fixed bed, achieving the triple goals of extending equipment lifespan, improving purification efficiency, and ensuring stable operation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the internal structure of the housing of the present invention;

[0023] Figure 2 This is a three-dimensional structural diagram of the present invention;

[0024] Figure 3 This is a schematic diagram showing the structural fit between the bracket and the support plate of the present invention;

[0025] Figure 4 This is a partial side-section structural diagram of the present invention;

[0026] Figure 5 For the present invention Figure 4 A magnified view of the structure at point A in the middle;

[0027] Figure 6 This is a schematic diagram showing the structural fit between the arc tapered plate and the sealing plate of the present invention;

[0028] Figure 7 This is a schematic diagram showing the structural fit between the inclined tapering plate and the sealing plate of the present invention;

[0029] Figure 8This is a schematic diagram showing the structural fit between the fixed column and the arc-shaped tapered plate of the present invention;

[0030] Figure 9 This is a schematic diagram showing the structural fit between the arc-shaped plate and the support plate of the present invention;

[0031] Figure 10 This is a schematic diagram showing the structural fit between the inner card plate and the fan blade of the present invention;

[0032] Figure 11 This is a schematic diagram showing the structural fit between the card post and the vertical plate of the present invention.

[0033] In the picture:

[0034] 100. Adsorption chamber; 200. Air inlet; 300. Air outlet; 400. Support plate; 500. Adsorption bed; 600. Filter cartridge; 700. Staged adsorption mechanism; 710. Double-sided clamping sleeve; 720. Inner clamping plate; 730. Fan blade; 740. Vertical plate; 750. Bracket; 760. Arc plate; 770. Triangular rotating shaft; 780. Secondary filter layer; 790. Primary filter layer; 7100. Clamping column; 800. Diverting mechanism; 810. Guide plate; 820. Arc tapering plate; 830. Fixing plate; 840. Heat dissipation hole; 850. Electric actuator; 860. Cylindrical rotating shaft; 870. Sealing plate; 880. Diverting groove; 890. Inclined tapering plate; 8100. Sliding groove plate; 8110. Fixing column; 900. Chamber door. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] like Figures 1 to 11 As shown, this invention provides a formaldehyde adsorption treatment device for polyurethane adhesive production, including an adsorption chamber 100. An air inlet 200 is provided on one side of the adsorption chamber 100, and an air outlet 300 is provided on the other side. Several support plates 400 are fixed to the side wall of the adsorption chamber 100, and a door 900 is rotatably connected to the support plates 400. Several filter cartridges 600 are arranged longitudinally inside the adsorption chamber 100 near the air inlet 200, and multiple adsorption beds 500 are arranged equidistantly on the sides of the filter cartridges 600. The device also includes:

[0037] The graded adsorption mechanism 700 is located inside the adsorption chamber 100;

[0038] Diverting mechanism 800, which is connected to adsorption box 100;

[0039] The graded adsorption mechanism 700 includes multiple triangular rotating shafts 770 rotatably connected to the inner wall of the adsorption box 100, and each of the triangular rotating shafts 770 has a double-sided ferrule 710 sleeved on its outer wall.

[0040] The above scheme employs the following: The adsorption chamber 100 is equipped with an air inlet 200 and an air outlet 300, forming an airflow channel. Waste gas enters through the air inlet 200 and is treated inside the adsorption chamber 100. A support plate 400 is fixed to the side wall of the adsorption chamber 100, providing support and connecting to the chamber door 900 for easy opening and maintenance. Inside the adsorption chamber 100, multiple filter cartridges 600 are arranged longitudinally, serving as a primary filter to effectively reduce formaldehyde concentration. Multiple adsorption beds 500 are evenly distributed beside the filter cartridges 600 for further adsorption of formaldehyde molecules. A staged adsorption mechanism 700 is located inside the adsorption chamber 100. Through the rotation of multiple triangular rotating shafts 770, it drives the airflow distribution of the adsorption beds 500 and the rotation of the filter cartridges 600, ensuring uniform distribution of formaldehyde molecules and accelerating the adsorption process. A flow distribution mechanism 800 is connected to the adsorption chamber 100 to adjust the airflow direction and speed, further improving adsorption efficiency. The coordinated use of various components effectively enhances the stability and adsorption capacity of waste gas treatment, enabling the equipment to efficiently adsorb and remove formaldehyde during the production of polyurethane adhesives, thus ensuring the safety of the production environment.

[0041] like Figure 3 , Figure 4 , Figure 6 , Figures 9 to 11 As shown, the graded adsorption mechanism 700 also includes a vertical plate 740 abutting against the side wall of the adsorption chamber 100. Both ends of the vertical plate 740 are secured to the edge of the adsorption chamber 100 via locking posts 7100. Several supports 750 are fixedly connected to the inner sides of the adsorption chamber 100 and the support plate 400. The tops of the supports 750 are slidably connected to the adsorption bed 500 via grooves. Inner locking plates 720 are fixedly connected to both ends of the double-sided locking sleeves 710 on both the upper and lower sides. The side walls of the inner locking plates 720, etc. Several fan blades 730 are fixedly connected to the support plate 400, and the ends of the fan blades 730 are fixedly connected to the double-sided clamping sleeves 710. Arc-shaped plates 760 are fixedly connected to the upper and lower sides of the support plate 400. The curvature of the arc-shaped plates 760 is consistent with the outer diameter of the double-sided clamping sleeves 710, and the width of the arc-shaped plates 760 is consistent with the width of the fan blades 730. The inner cavity of the filter cartridge 600 is filled with a primary filter layer 790, and the inner cavity of the adsorption bed 500 is filled with a secondary filter layer 780. The height of the arc-shaped plates 760 is greater than the height of the secondary filter layer 780.

[0042] The above scheme employs a primary filter layer 790 with relatively large activated carbon pores, used to adsorb dust, water droplets, aerosols, and large organic molecules. The secondary filter layer 780, however, uses microporous activated carbon, effectively adsorbing formaldehyde molecules. When the filter cartridge 600 rotates due to the air curtain, the fan blades 730 on both sides also rotate, promoting airflow at the top and bottom of the adsorption chamber 100. This prevents vortices from forming in the corners of the air intake area, ensuring that the airflow is evenly distributed to all corners of the adsorption bed 500, thereby improving the adsorption efficiency of the activated carbon. After primary adsorption in the filter cartridge 600, the formaldehyde gas enters the re-adsorption process in the adsorption bed 500. The microporous activated carbon treatment in the secondary filter layer 780 not only extends the filter cartridge's lifespan but also effectively reduces equipment operating costs.

[0043] like Figures 4 to 8 As shown, the diversion mechanism 800 includes a sealing plate 870 fixedly attached to the inner cavity of the adsorption box 100. A guide plate 810 is fixedly attached to the side of the sealing plate 870 near the air inlet 200. The guide plate 810 and the sealing plate 870 are both provided with an arc-shaped groove in the middle, and an arc-shaped tapered plate 820 is slidably connected to the middle of the two through the arc-shaped groove. Diversion grooves 880 are provided at the upper and lower ends of the sealing plate 870. A pair of inclined tapered plates 890 are fixedly connected to the two ends of the side wall of the sealing plate 870 through the diversion grooves 880. The ends of the pair of inclined tapered plates 890 are all The surface of the filter cartridge 600 is inclined towards the surface of the flow guide plate 810; an electric push rod 850 is fixedly connected to the edge of the flow guide plate 810, and a sliding groove plate 8100 is fixedly connected to the output end of the electric push rod 850. A fixed column 8110 is movably connected inside the sliding groove plate 8100, and the end of the fixed column 8110 is fixedly connected to the arc tapering plate 820. The outer wall of the adsorption box 100 is provided with heat dissipation holes 840; cylindrical rotating shafts 860 are fixedly connected to both sides of the inner cavity of the arc tapering plate 820 through fixed plates 830, and both ends of the cylindrical rotating shafts 860 are rotatably connected to the adsorption box 100.

[0044] The above scheme employs a double-sided clamping sleeve 710 with detachable outer clamping plates at its ends. These outer clamping plates are installed via snap-fit ​​connections for easy replacement of the filter cartridge 600. Formaldehyde gas reaches the side area of ​​the sealing plate 870 and is guided by the diversion groove 880 and the arc-shaped perforated groove, resulting in uniform dispersion of the gas into the inclined tapering plate 890 and the arc-shaped tapering plate 820. This process, through the gradually contracting spatial flow, accelerates the airflow speed and effectively enhances the airflow guidance effect through the formation of an air curtain. The ends of the pair of inclined tapering plates 890 are angled towards the surface of the filter cartridge 600. This design allows the air curtain to continuously and obliquely blow across the surface of the filter cartridge 600, causing it to rotate automatically. The rotation of the filter cartridge 600 not only enhances the adsorption capacity of impurities in the gas but also effectively adsorbs dust, water droplets, aerosols, and large molecular organic matter that may remain from the pretreatment process through the large pores of the activated carbon filling. The stable rotation of the filter cartridge 600 is ensured by the double-sided retaining sleeves 710 and the fan blades 730 at both ends. The rotation of the fan blades 730 also promotes airflow at the upper and lower ends of the adsorption chamber 100, preventing the formation of angular vortices in the corners of the air intake area and ensuring that the airflow can flow evenly to all corners of the adsorption bed 500. Furthermore, the arc-shaped tapered plate 820 can be rotated to adjust its angle. When the air curtain is angled upwards, the airflow is biased towards the upper side of the adsorption chamber 100, making full use of the upper adsorption bed 500 area; conversely, when the air curtain is adjusted downwards, the airflow will be biased towards the lower area, thus making full use of the lower adsorption bed 500. This adjustment mechanism enables the central adsorption bed 500 to adsorb formaldehyde on both sides.

[0045] Working principle and usage process of this invention:

[0046] First, formaldehyde gas enters the adsorption chamber 100 through the inlet 200, passes through the filter cartridge 600 and the adsorption bed 500 in sequence, and then exits through the outlet 300. The formaldehyde is adsorbed in stages through the primary filter layer 790 and the secondary filter layer 780 inside the filter cartridge 600 and the adsorption bed 500, thereby improving the cleanliness of the gas finally discharged from the outlet 300.

[0047] Furthermore, the formaldehyde gas generated during the reaction molding and curing stages of the polyurethane adhesive is collected and pretreated to remove most of the dust, water droplets, aerosols, and large molecular organic matter. The relatively pure formaldehyde gas is then discharged into the adsorption chamber 100. After entering the adsorption chamber 100, the formaldehyde gas first reaches the side area of ​​the sealing plate 870, and is dispersed into the inclined tapering plate 890 and the arc-shaped perforated groove through the diversion groove 880. The formaldehyde gas flows through the tapered space, increasing the flow rate and forming an air curtain upon discharge. Since the ends of both inclined tapering plates 890 are inclined towards the surface of the filter cartridge 600, the air curtain continuously cuts and blows obliquely across the surface of the filter cartridge 600, causing the filter cartridge 600 to rotate automatically, adsorbing impurities in the gas from all directions. Furthermore, the activated carbon filling the filter cartridge 600 has relatively large pore sizes, effectively adsorbing any dust, water droplets, aerosols, and large molecular organic matter that may remain from the previous pretreatment step. Figure 6 As shown, the filter cartridges 600 on both the upper and lower sides rotate in the direction indicated by the arrows, and the stable rotation of the filter cartridges 600 is ensured by the fan blades 730 at both ends of the double-sided retaining sleeves 710. In addition, the fan blades 730 can also drive the airflow at the right angles at the upper and lower ends of the adsorption box 100, avoiding the formation of corner vortices in the corners of the air intake area of ​​the adsorption box 100, thereby allowing the airflow to fully flow to the corners of the adsorption bed 500 and improving the full adsorption capacity of the activated carbon;

[0048] Furthermore, the central arc-shaped tapered plate 820 can be rotated to adjust the air outlet angle. When the electric actuator 850 moves the sliding plate 8100 upward, the sliding plate 8100 presses against the fixed column 8110, thereby causing the arc-shaped tapered plate 820 to rotate around the cylindrical pivot 860. This causes the outlet air curtain of the arc-shaped tapered plate 820 to cut upward at an angle onto the surface of the central filter cartridge 600. At this time, the rotation direction of the central filter cartridge 600 is the same as that of the lower filter cartridge 600. As a result, the main airflow will be biased upward within the adsorption box 100, and the area above the central adsorption bed 500 can fully adsorb formaldehyde. Conversely, if the outlet air curtain of the arc-shaped tapered plate 820 is adjusted to cut downwards at an angle onto the surface of the filter cartridge 600, the rotation direction of the middle filter cartridge 600 will be opposite to that of the upper filter cartridge 600. In this case, the main airflow will be biased downwards within the adsorption chamber 100, ensuring that the area below the middle adsorption bed 500 also fully adsorbs formaldehyde. Adjusting the angle of the arc-shaped tapered plate 820 allows for the full adsorption of formaldehyde on both sides of the middle adsorption bed 500, further improving the activated carbon utilization efficiency of the adsorption bed 500. Furthermore, after primary adsorption in the filter cartridge 600, the formaldehyde gas is re-adsorbed onto the adsorption bed 500. Passing through the microporous activated carbon of the secondary filter layer 780, the formaldehyde gas extends the replacement cycle of the entire filter element, reducing operating costs.

[0049] Finally, when replacing filter cartridge 600, the operator opens the chamber door 900, then pulls the vertical plate 740 outwards with both hands, disengaging the retaining column 7100 from the adsorption chamber 100. After removing the vertical plate 740, the double-sided retaining sleeve 710 and filter cartridge 600 are simultaneously pulled out from the triangular rotating shaft 770. Next, the inner retaining plate 720 and outer retaining plate on the edge of the double-sided retaining sleeve 710 are removed, allowing the filter cartridge 600 to be replaced. The process can then be reversed for reinstallation. Furthermore, the adsorption bed 500 can be slid out from the support 750 for direct replacement of the internal activated carbon.

[0050] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A formaldehyde adsorption treatment device for polyurethane adhesive production, comprising an adsorption chamber (100), wherein an air inlet (200) is provided on one side of the adsorption chamber (100), and an air outlet (300) is provided on the other side of the adsorption chamber (100); a plurality of support plates (400) are fixedly connected to the side wall of the adsorption chamber (100); a door (900) is rotatably connected to the support plate (400); a plurality of filter cartridges (600) are arranged longitudinally on the side of the adsorption chamber (100) near the air inlet (200); and a plurality of adsorption beds (500) are arranged equidistantly on the sides of the filter cartridges (600), characterized in that: Also includes: A graded adsorption mechanism (700) is located inside the adsorption chamber (100); A diversion mechanism (800) is connected to the adsorption box (100); The graded adsorption mechanism (700) includes a plurality of triangular rotating shafts (770) rotatably connected to the inner wall of the adsorption box (100), and the outer wall of each triangular rotating shaft (770) is fitted with a double-sided ferrule (710).

2. The formaldehyde adsorption treatment equipment for polyurethane adhesive production according to claim 1, characterized in that: The graded adsorption mechanism (700) also includes a vertical plate (740) abutting against the side wall of the adsorption box (100). The upper and lower ends of the vertical plate (740) are both clamped to the edge of the adsorption box (100) by a locking post (7100). Several supports (750) are fixedly connected to the inner side of the adsorption box (100) and the support plate (400). The top of each support (750) is slidably connected to the adsorption bed (500) through a groove.

3. The formaldehyde adsorption treatment equipment for polyurethane adhesive production according to claim 2, characterized in that: Both ends of the double-sided sleeve (710) on the upper and lower sides are fixed with inner clamping plates (720), and a number of fan blades (730) are fixed at equal intervals on the side wall of the inner clamping plate (720), and the ends of the fan blades (730) are fixed to the double-sided sleeve (710).

4. The formaldehyde adsorption treatment equipment for polyurethane adhesive production according to claim 3, characterized in that: The upper and lower sides of the support plate (400) are fixed with arc-shaped plates (760), the curvature of the arc-shaped plates (760) is consistent with the outer diameter of the double-sided ferrule (710), and the width of the arc-shaped plates (760) is consistent with the width of the fan blade (730).

5. The formaldehyde adsorption treatment equipment for polyurethane adhesive production according to claim 4, characterized in that: The inner cavity of the filter cartridge (600) is filled with a primary filter layer (790), the inner cavity of the adsorption bed (500) is filled with a secondary filter layer (780), and the height of the arc plate (760) is greater than the height of the secondary filter layer (780).

6. The formaldehyde adsorption treatment equipment for polyurethane adhesive production according to claim 1, characterized in that: The diversion mechanism (800) includes a sealing plate (870) fixed to the inner cavity of the adsorption box (100), and a guide plate (810) is fixed to the side of the sealing plate (870) near the air inlet (200).

7. The formaldehyde adsorption treatment equipment for polyurethane adhesive production according to claim 6, characterized in that: The guide plate (810) and the sealing plate (870) are provided with a circular arc groove in the middle, and a circular arc tapering plate (820) is slidably connected between them through the circular arc groove.

8. The formaldehyde adsorption treatment equipment for polyurethane adhesive production according to claim 7, characterized in that: The sealing plate (870) has a diversion groove (880) at both the upper and lower ends. A pair of inclined tapering plates (890) are fixedly connected to the two ends of the side wall of the sealing plate (870) through the diversion groove (880). The ends of the pair of inclined tapering plates (890) are inclined towards the surface of the filter cartridge (600).

9. The formaldehyde adsorption treatment equipment for polyurethane adhesive production according to claim 8, characterized in that: An electric push rod (850) is fixedly connected to the edge of the guide plate (810), and a sliding plate (8100) is fixedly connected to the output end of the electric push rod (850). A fixed column (8110) is movably connected inside the sliding plate (8100), and the end of the fixed column (8110) is fixedly connected to the arc tapering plate (820). The outer wall of the adsorption box (100) is provided with heat dissipation holes (840).

10. The formaldehyde adsorption treatment equipment for polyurethane adhesive production according to claim 9, characterized in that: Both sides of the inner cavity of the arc tapering plate (820) are fixed with cylindrical rotating shafts (860) by fixing plates (830), and both ends of the cylindrical rotating shafts (860) are rotatably connected to the adsorption box (100).

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