Filtering equipment for polyurethane curing agent

Abstract

The utility model discloses filtering equipment for a polyurethane curing agent, and relates to the technical field of curing agent processing. The polyurethane curing agent filtering device comprises a filtering box, a feeding hopper is fixedly installed in the filtering box, the feeding hopper is located at the position close to an opening in the top of the filtering box, and the feeding hopper is used for conveying a polyurethane curing agent into the filtering box; the device further comprises a first filtering assembly, and the first filtering assembly is used for preliminarily filtering the polyurethane curing agent input into the filtering box. According to the filtering equipment disclosed by the utility model, through the design of the double filtering components, the high-efficiency fine filtering of a polyurethane curing agent is realized; an air cylinder, a piston block, a pipe clamp and an abutting rod are used in cooperation, intelligent extrusion filtering of the polyurethane curing agent is achieved, and the filtering effect is improved; meanwhile, the detachable design of the filter box is matched with the arrangement of the movable door, so that a user can conveniently clean impurities filtered out of the equipment, and the overall design has remarkable practicability and innovativeness.

Description

TECHNICAL FIELD

[0001] The utility model belongs to curing agent processing technical field, especially, relate to a filter equipment for polyurethane curing agent. BACKGROUND

[0002] Polyurethane curing agent usually refers to the component containing isocyanate group in two-component polyurethane product, and is mainly used with the component containing active hydrogen. In the production and use process of polyurethane curing agent, filtering treatment is an important link to ensure the quality and performance of the curing agent. However, the existing filter equipment still has the following problems when in use:

[0003] The traditional filter equipment usually adopts a single filter layer, which is difficult to effectively remove the fine impurities in the polyurethane curing agent, resulting in unstable quality of the filtered curing agent; the cleaning effect of the accumulated impurities in the filter equipment and the maintenance effect of the filter structure are not good enough after the filtering operation is completed, which can easily affect the use effect and service life of the filter equipment. SUMMARY

[0004] The utility model discloses a kind of filter equipment for polyurethane curing agent, in the utility model, the filter equipment is realized by the design of double filter assembly, efficient fine filtering of polyurethane curing agent is realized, ensure product quality stability;Cylinder, piston block and pipe clamp, the use of abutment rod, realize intelligent extrusion filtering to polyurethane curing agent, improve filtering effect;At the same time, filter box can be dismantled Design cooperates the setting of movable door, can conveniently user to the impurities filtered in equipment is cleaned and carries out corresponding equipment maintenance, can ensure that device continues efficient operation, overall design has remarkable practicality and innovativeness, solve the existing technical problem.

[0005] To solve the above technical problems, the utility model is realized by the following technical schemes:

[0006] A kind of filter equipment for polyurethane curing agent, comprising:

[0007] Filter box, the inside fixed mounting of the filter box has feeding hopper, the feeding hopper is located at the position close to filter box top opening, the feeding hopper is used to deliver polyurethane curing agent to filter box inside;

[0008] Further comprising first filter assembly, the first filter assembly is used to carry out preliminary filtering to the polyurethane curing agent input to filter box inside;

[0009] Further comprising second filter assembly, the second filter assembly is used to carry out secondary filtering to the polyurethane curing agent after preliminary treatment;

[0010] The discharge pipe is fixedly installed at the bottom of the filter box, and a valve is arranged on the discharge pipe, which is used for discharging the polyurethane curing agent filtered in the filter box.

[0011] Optionally, the first filter assembly comprises a communication pipe fixedly installed in the filter box, which is located below the feeding hopper and fixedly connected with the bottom of the feeding hopper, the top of the communication pipe is connected with the feeding hopper through a through hole, one end of the communication pipe penetrates through one side of the filter box, the bottom of the communication pipe is fixedly installed with a connecting hose for discharging the polyurethane curing agent, and the filter box is slidably installed in the communication pipe.

[0012] Optionally, the bottom inner wall of the filter box is fixedly installed with a flow guide seat, which is located on the side of the filter screen away from the connecting hose, and the top of the flow guide seat is provided with an inclined surface, which is used to ensure that the polyurethane curing agent entering the filter box can flow towards the filter screen and the connecting hose.

[0013] Optionally, the second filter assembly comprises a filter cartridge fixedly penetrating through one side of the filter box, which is located below the communication pipe, the outer wall of the filter cartridge is provided with a plurality of filter holes, and the plurality of filter holes are located in the filter box and used for secondary filtering of the polyurethane curing agent entering the filter cartridge, the inner wall of the filter cartridge is sealingly and slidably connected with a piston block, one end of the connecting hose slidably penetrates through one side of the filter cartridge and is fixedly penetrated through the piston block, and the connecting hose is used for conveying the polyurethane curing agent into the filter cartridge; the filter box is fixedly installed with an air cylinder through a support on one side, one end of the piston rod of the air cylinder slidably and sealingly penetrates through the inner wall of one side of the filter box and one side of the filter cartridge, and one end of the piston rod of the air cylinder is fixedly connected with one side of the piston block, which is used to push the piston block to move in the filter cartridge to extrude the polyurethane curing agent to make it more efficiently complete the filtering.

[0014] Optionally, the two side inner walls of the filter box are fixedly provided with fixed supports, the connecting hose is slidably penetrated through the fixed supports, the inner part of the fixed support is slidably provided with a pipe clamp, the inner part of the pipe clamp is provided with a clamping groove, the inner diameter of the clamping groove gradually increases along the direction towards the filter cartridge, one end of the connecting hose is penetrated through the clamping groove and the outer wall of the connecting hose is slidably matched with the inner wall of the clamping groove, and the pipe clamp is used for clamping and closing the connecting hose.

[0015] Optionally, the one end of the filter cartridge towards the outside of the filter box is provided with an opening, and the one end of the filter cartridge is hingedly provided with a movable door, which is matched with the filter cartridge through a lock buckle and is used for closing the opening of the filter cartridge so as to clean the impurities in the filter cartridge.

[0016] Optionally, the inner wall of one side of the filter box is fixedly provided with an arc-shaped cover plate, the arc-shaped cover plate is located above the filter cartridge, and the arc-shaped cover plate is tightly attached to the outer wall of the filter cartridge and is used for shielding the upper part of the filter cartridge so as to ensure that the polyurethane curing agent can be extruded to the outside of the filter cartridge from below.

[0017] Optionally, the top of the filter box is provided with a top cover, and the top cover is used for shielding the opening of the feeding hopper.

[0018] The embodiment of the utility model has the following beneficial effects:

[0019] In the utility model, through setting first filter assembly and second filter assembly, realized to polyurethane curing agent's double filtration, first filter assembly carries out preliminary filtration to polyurethane curing agent through filter screen, removes larger impurity, second filter assembly then carries out secondary filtration to the polyurethane curing agent after preliminary treatment through multiple filter holes, further removes small impurity, thereby ensured that the quality of the filtered polyurethane curing agent is stable and excellent performance;

[0020] In the utility model, by setting the flow guide seat in the first filter assembly, the slope of the flow guide seat can guide the flow direction of the polyurethane curing agent to the filter screen, avoiding the accumulation and blockage of the polyurethane curing agent on the filter layer, and improving the filtering efficiency.

[0021] The utility model discloses, through the cylinder push piston block moves in the filter cartridge, can extrude to polyurethane curing agent, can make it more efficiently complete filtration, simultaneously, through the cooperation of pipe clamp and abutment rod, realized the intelligent closing and opening of connecting hose, ensured that piston block in extrusion process will not have new polyurethane curing agent continue to join, thereby improved the filtering effect,

[0022] The filter box is convenient to disassemble and take out, and the user can conveniently clean the impurities filtered.

[0023] Of course, implementing any product of the utility model does not necessarily need to achieve all the advantages mentioned above. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will be to the embodiment description needed to use the drawing briefly introduced, obviously, the following description in the drawing is only some embodiments of the utility model, for those skilled in the art, under the premise of not paying creative labor, can also obtain other drawings according to these drawings.

[0025] Figure 1 It is a three-dimensional structure schematic view of an embodiment of the utility model;

[0026] Figure 2 It is a sectional structure schematic view of an embodiment of the utility model;

[0027] Figure 3 It is a first filter assembly structure schematic view of an embodiment of the utility model;

[0028] Figure 4 It is a second filter assembly structure schematic view of an embodiment of the utility model;

[0029] Figure 5 It is a pipe clamp installation structure schematic view of an embodiment of the utility model.

[0030] In the drawing: 1, filter box, 2, feed hopper, 3, communication pipeline, 4, filter box, 5, connecting hose, 6, filter cartridge, 7, movable door, 8, piston block, 9, cylinder, 10, discharge pipe, 11, valve, 12, filter screen, 13, flow guide seat, 14, filter hole, 15, arc-shaped cover plate, 16, fixed support, 17, pipe clamp, 18, clamping groove, 19, fixed block, 20, guide rod, 21, spring, 22, abutment rod, 23, top cover. DETAILED DESCRIPTION

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0032] In the description of this utility model, it should be understood that the terms "opening", "upper", "middle", "length", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0033] To keep the following description of the embodiments of this utility model clear and concise, detailed descriptions of known functions and known components are omitted.

[0034] Example 1: Please refer to Figures 1-5 As shown, this embodiment provides a filtration device, including:

[0035] A filter box 1 is equipped with a feed hopper 2 fixedly installed inside. The feed hopper 2 is located near the top opening of the filter box 1 and is used to deliver polyurethane curing agent into the filter box 1. The design of the feed hopper 2 facilitates the pouring of polyurethane curing agent into the filter box 1 for processing.

[0036] To perform preliminary filtration of the polyurethane curing agent, a first filtration assembly is installed inside the filter box 1 in this embodiment. The first filtration assembly includes a connecting pipe 3 fixedly installed inside the filter box 1. The connecting pipe 3 is located below the feed hopper 2 and is fixedly connected to the bottom of the feed hopper 2. The top of the connecting pipe 3 is connected to the feed hopper 2 through a through hole, ensuring that the polyurethane curing agent can smoothly enter the connecting pipe 3. One end of the connecting pipe 3 penetrates one side of the filter box 1, and a connecting hose 5 is fixedly installed at its bottom for discharging the polyurethane curing agent. A filter box 4 is slidably installed inside the connecting pipe 3. A filter screen 12 is fixedly installed on the inner wall of the filter box 4, located between the feed hopper 2 and the connecting hose 5, for preliminary filtration of the polyurethane curing agent entering the filter box 4. Furthermore, the filter box 4 is engaged with the inner wall of the connecting pipe 3 via a rubber gasket, ensuring stable installation of the filter box 4 within the connecting pipe 3.

[0037] In order to further improve the filtering effect, the bottom inner wall of the filter box 4 is fixedly installed with a flow guide seat 13, which is located on the side of the filter screen 12 away from the connecting hose 5. The top of the flow guide seat 13 is provided with an inclined surface, which can ensure that the polyurethane curing agent entering the filter box 4 can flow towards the direction of the filter screen 12 and the connecting hose 5, thereby more fully contacting the filter screen 12 and improving the filtering effect.

[0038] After the preliminary filtration is completed, the second filtering assembly is arranged to perform secondary filtration on the polyurethane curing agent. The second filtering assembly includes a filter cartridge 6 fixedly penetrating one side of the filter box 1, and the filter cartridge 6 is located below the communication pipeline 3. The outer wall of the filter cartridge 6 is provided with a plurality of filter holes 14, which are located in the filter box 1 and used for secondary filtration of the polyurethane curing agent entering the filter cartridge 6. The inner wall of the filter cartridge 6 is sealingly and slidingly connected with a piston block 8, one end of the connecting hose 5 slidingly penetrates one side of the filter cartridge 6 and is fixedly penetrated through the piston block 8, and is used for conveying the polyurethane curing agent into the filter cartridge 6.

[0039] In order to push the piston block 8 to move in the filter cartridge 6 to extrude the polyurethane curing agent and make it more efficient to complete the filtration, a gas cylinder 9 is fixedly installed on one side of the filter box 1 through a support. One end of the piston rod of the gas cylinder 9 slidingly and sealingly penetrates the inner wall of one side of the filter box 1 and one side of the filter cartridge 6, and is fixedly connected with one side of the piston block 8. When the piston rod of the gas cylinder 9 is extended and retracted, it can drive the piston block 8 to move in the filter cartridge 6, thereby extruding and filtering the polyurethane curing agent.

[0040] In order to ensure that the connecting hose 5 can remain stable when conveying the polyurethane curing agent, a fixed support 16 is fixedly installed between the inner walls of both sides of the filter box 1, and the connecting hose 5 slidingly penetrates the fixed support 16.

[0041] Further, in the embodiment, a pipe clamp 17 is arranged to slide in the interior of the fixing support 16, the pipe clamp 17 is provided with a clamping groove 18 in the interior, and the inner diameter of the clamping groove 18 gradually increases along the direction towards the filter cartridge 6. One end of the connecting hose 5 penetrates through the clamping groove 18 and the outer wall of the connecting hose 5 is in sliding fit with the inner wall of the clamping groove 18, so that the pipe clamp 17 can clamp and close the connecting hose 5. Meanwhile, two guide rods 20 are fixedly installed on the inner wall of one side of the filter box 1, and the other ends of the two guide rods 20 are fixedly connected with one side of the filter cartridge 6. The two guide rods 20 are located on the two sides of the pipe clamp 17, and the outer walls of the two guide rods 20 are both sleeved with a fixing block 19. The two fixing blocks 19 are fixedly connected with the two sides of the pipe clamp 17, for keeping the stable sliding of the pipe clamp 17. The outer walls of the two guide rods 20 are both sleeved with a spring 21, one end of the two springs 21 is fixedly connected with one side of the adjacent fixing block 19, and the other end is fixedly connected with the inner wall of one side of the filter box 1. The arrangement of the spring 21 can ensure that the pipe clamp 17 can keep clamping the connecting hose 5 when not subjected to external force. In addition, a butt rod 22 is also fixedly installed on one side of the pipe clamp 17, one end of the butt rod 22 slides through one side of the filter cartridge 6 and cooperates with the piston block 8. When the piston block 8 returns to the original position after extrusion, the piston block 8 can push the butt rod 22 to drive the pipe clamp 17 to move, so as to open the connecting hose 5, and the polyurethane curing agent can smoothly enter the filter cartridge 6.

[0042] The present application can be used in the field of curing agent processing technology, and can also be used in other fields applicable to the present application.

[0043] Embodiment 2: Reference Figure 2 4 Improvement based on embodiment 1: a filtering device for polyurethane curing agent, which is applied to the field of curing agent processing technology.

[0044] In order to facilitate the subsequent cleaning of impurities in the filter cartridge 6, in the embodiment, an opening is formed on one end of the filter cartridge 6 towards the outside of the filter box 1, and a movable door 7 is hinged. The movable door 7 cooperates with the filter cartridge 6 through a lock catch, for closing the opening of the filter cartridge 6. When it is necessary to clean the impurities in the filter cartridge 6, the movable door 7 can be opened.

[0045] In addition, in order to shield the upper part of the filter cartridge 6 and ensure that the polyurethane curing agent can be extruded from the lower part to the outside of the filter cartridge 6, in the embodiment, an arc-shaped cover plate 15 is fixedly installed on the inner wall of one side of the filter box 1. The arc-shaped cover plate 15 is located above the filter cartridge 6 and closely abuts the outer wall of the filter cartridge 6.

[0046] ​Finally, in order to shield the opening of the feeding hopper 2, prevent impurities from entering the filter box 1, the top cover 23 is arranged at the top of the filter box 1. When the filter device needs to be used, the polyurethane curing agent can be poured into the feeding hopper 2 by removing the top cover 23.

[0047] However, as known to those skilled in the art, the working principle and wiring method of the air cylinder 9 are common, which are all conventional means or common general knowledge, and will not be described here again, and those skilled in the art can make any selection according to their needs or convenience.

[0048] The use process and working principle of the technical scheme of the utility model are as follows:

[0049] In use, the user can pour the polyurethane curing agent to be treated into the feed hopper 2, and then the polyurethane curing agent will enter the communication pipe 3 under the action of gravity and fall into the filter box 4; as the polyurethane curing agent flows along the inclined surface of the flow guide seat 13, the polyurethane curing agent will eventually pass through the filter screen 12, which can preliminarily filter the polyurethane curing agent, and the filtered polyurethane curing agent will enter the connecting hose 5 and continue to move under the action of gravity; the polyurethane curing agent after preliminary treatment can move along the connecting hose 5 to the filter cartridge 6, and the polyurethane curing agent in the filter cartridge 6 can pass through the filter holes 14 to complete the corresponding secondary filtration, and then the polyurethane curing agent after two filtrations will finally be collected at the bottom of the filter box 1; when the polyurethane curing agent enters the filter cartridge 6, the user can start the air cylinder 9 to push the piston block 8 to move, the piston block 8 can push and extrude the polyurethane curing agent in the filter cartridge 6, so that the polyurethane curing agent in the filter cartridge 6 can be more efficiently filtered; and when the air cylinder 9 pushes the piston block 8 to move, the piston block 8 no longer abuts against the abutting rod 22, at this time the pipe clamp 17 will move towards the filter cartridge 6 under the action of the two springs 21, at this time the connecting hose 5 will be clamped into the position with smaller inner diameter of the clamping groove 18, thereby the connecting hose 5 can be closed, so that when the piston block 8 extrudes the polyurethane curing agent in the filter cartridge 6, no new polyurethane curing agent will continue to be added to the filter cartridge 6; on the contrary, when the piston block 8 returns to the original position, at this time the piston block 8 will abut against the abutting rod 22 and push the pipe clamp 17 to move, the connecting hose 5 will move to the position with larger inner diameter of the clamping groove 18, at this time the polyurethane curing agent can continue to be supplemented to the filter cartridge 6, thereby the filtering effect of the polyurethane curing agent can be ensured to be good; when the user needs to take out the filtered polyurethane curing agent, the user only needs to open the valve 11 and use the discharge pipe 10 to discharge the polyurethane curing agent stored at the bottom of the filter box 1; and when the user completes the filtering operation, the user can pull out the filter box 4 from the communication pipe 3, and at the same time the movable door 7 can be opened, at this time the filter impurities collected in the filter box 4 and the filter cartridge 6 can be cleaned to ensure that the subsequent working effect of the device is good.

[0050] It should be noted that in the description of the present application, descriptions such as "first", "second", etc. are only used to distinguish various features, and do not have actual order or directional meanings, and the present application is not limited thereto.

[0051] In the description of the specification, the description of the terms "one embodiment", "an example", "a specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0052] The preferred embodiments of the utility model disclosed above are only used for helping to set forth the utility model. The preferred embodiments do not describe all the details exhaustively, and also do not limit the utility model to only the specific implementation manners described. Obviously, according to the content of the specification, many modifications and changes can be made. The specification selects and specifically describes these embodiments, in order to better explain the principles and practical applications of the utility model, so that the persons skilled in the art can well understand and utilize the utility model. The utility model is limited only by the claims and the whole scope and equivalents thereof.

Claims

1. A filtering apparatus for polyurethane curing agents, characterized by, The utility model relates to a polyurethane curing agent filtering device, which comprises the following components: a filtering box (1) is internally fixedly installed with a feeding hopper (2) located close to the top opening of the filtering box (1), which is used to deliver polyurethane curing agent into the filtering box (1); a first filtering assembly is further included for the preliminary filtering of the polyurethane curing agent input into the filtering box (1); a second filtering assembly is further included for the secondary filtering of the polyurethane curing agent after preliminary processing; a discharge pipe (10) is further included, which is fixedly installed at the bottom of the filtering box (1) and is provided with a valve (11) on the discharge pipe (10), which is used to discharge the polyurethane curing agent after filtering treatment in the filtering box (1).

2. A filter apparatus for polyurethane curing agents as claimed in claim 1, characterised in that, The first filtering assembly comprises a communication pipe (3) fixedly installed in the filtering box (1), which is located below the feeding hopper (2) and is fixedly connected with the bottom of the feeding hopper (2), the top of the communication pipe (3) is connected with the feeding hopper (2) through a through hole, one end of the communication pipe (3) penetrates through one side of the filtering box (1), the bottom of the communication pipe (3) is fixedly installed with a connecting hose (5) for discharging polyurethane curing agent, and the inside of the communication pipe (3) is slidably installed with a filter box (4), the inner wall of the filter box (4) is fixedly installed with a filter screen (12) located between the feeding hopper (2) and the connecting hose (5) for the preliminary filtering of the polyurethane curing agent entering the filter box (4).

3. A filter apparatus for polyurethane curing agents as claimed in claim 2, characterised in that, The bottom inner wall of the filter box (4) is fixedly installed with a flow guide seat (13) located on the side of the filter screen (12) away from the connecting hose (5), the top of the flow guide seat (13) is provided with an inclined surface, and the flow guide seat (13) is used to ensure that the polyurethane curing agent entering the filter box (4) can flow towards the direction of the filter screen (12) and the connecting hose (5).

4. A filter apparatus for polyurethane curing agents as claimed in claim 2, wherein, The second filtering assembly comprises a filtering cylinder (6) fixedly penetrating through one side of the filtering box (1), the filtering cylinder (6) is located below the communicating pipeline (3), a plurality of filter holes (14) are formed in the outer wall of the filtering cylinder (6), the plurality of filter holes (14) are located in the filtering box (1), and the filter holes (14) are used for secondary filtering of the polyurethane curing agent entering the filtering cylinder (6); a piston block (8) is sealingly and slidably connected to the inner wall of the filtering cylinder (6), one end of the connecting hose (5) is slidably penetrated through one side of the filtering cylinder (6) and fixedly penetrated through the piston block (8), and the connecting hose (5) is used for conveying the polyurethane curing agent into the filtering cylinder (6); the filtering box (1) is fixedly installed with an air cylinder (9) on one side through a support, one end of the piston rod of the air cylinder (9) is slidably and sealingly penetrated through the inner wall of one side of the filtering box (1) and one side of the filtering cylinder (6), one end of the piston rod of the air cylinder (9) is fixedly connected to one side of the piston block (8), and the piston block (8) is used for moving in the filtering cylinder (6) to extrude the polyurethane curing agent so that the polyurethane curing agent can be more efficiently filtered.

5. A filter apparatus for polyurethane curing agents as claimed in claim 4, characterised in that, The filtering box (1) is fixedly installed with a fixed support (16) between the inner walls of the two sides, the connecting hose (5) is slidably penetrated through the fixed support (16), the fixed support (16) is slidably provided with a pipe clamp (17) inside, the pipe clamp (17) is provided with a clamping groove (18) inside, the inner diameter of the clamping groove (18) gradually increases along the direction towards the filtering cylinder (6), one end of the connecting hose (5) penetrates through the clamping groove (18), the outer wall of the connecting hose (5) is in sliding fit with the inner wall of the clamping groove (18), and the pipe clamp (17) is used for clamping and closing the connecting hose (5); two guide rods (20) are fixedly installed on the inner wall of one side of the filtering box (1), the other ends of the two guide rods (20) are fixedly connected to one side of the filtering cylinder (6), the two guide rods (20) are located on the two sides of the pipe clamp (17) respectively, the outer walls of the two guide rods (20) are slidably sleeved with fixed blocks (19), the two fixed blocks (19) are fixedly connected to the two sides of the pipe clamp (17) respectively, the outer walls of the two guide rods (20) are sleeved with springs (21), one end of each of the two springs (21) is fixedly connected to one side of the adjacent fixed block (19), and the two springs (21) are fixedly connected to the inner wall of one side of the filtering box (1); a butt rod (22) is fixedly installed on one side of the pipe clamp (17), one end of the butt rod (22) is slidably penetrated through one side of the filtering cylinder (6) and matched with the piston block (8).

6. A filter apparatus for polyurethane curing agents as claimed in claim 4, wherein, An opening is formed in one end of the filtering cylinder (6) towards the outside of the filtering box (1), a movable door (7) is hinged to one end of the filtering cylinder (6), the movable door (7) is matched with the filtering cylinder (6) through a lock buckle, and the movable door (7) is used for closing the opening of the filtering cylinder (6) so as to clean the impurities in the filtering cylinder (6) subsequently.

7. The filtering device for polyurethane curing agent according to claim 4, wherein an arc-shaped cover plate (15) is fixedly installed on the inner wall of one side of the filtering box (1), the arc-shaped cover plate (15) is located above the filtering cylinder (6), and the arc-shaped cover plate (15) is tightly attached to the outer wall of the filtering cylinder (6) to shield the upper part of the filtering cylinder (6), so that the polyurethane curing agent can be extruded to the outside of the filtering cylinder (6) from below.

8. The filtering device for polyurethane curing agent according to claim 1, wherein a top cover (23) is arranged on the top of the filtering box (1) to shield the opening of the feeding hopper (2).

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