Multi-stage filtering device

Abstract

The utility model discloses a multistage filtering device which comprises a box body, a primary filtering mechanism and a secondary filtering mechanism, the box body is provided with a filtering cavity, a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are respectively communicated with the filtering cavity, and the filtering cavity is provided with a mounting port which is opened upwards; the primary filtering mechanism is arranged in the filtering cavity; the secondary filtering mechanism and the primary filtering mechanism are arranged in the filtering cavity at an interval; wherein the secondary filtering mechanism comprises a vibration support, at least one secondary filtering net and a driving mechanism, the vibration support is arranged in the filtering cavity in a reciprocating motion mode, and the at least one secondary filtering net is detachably installed on the vibration support from the installation opening; the driving mechanism is arranged in the filter cavity and used for driving the vibration support to drive the at least one secondary filter screen to vibrate, when the secondary filter screen needs to be replaced or cleaned, only the secondary filter screen needs to be detached from the vibration support, the secondary filter screen is taken out upwards from the mounting opening, operation is convenient, time and labor are saved, and cleaning and replacement are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of filtering devices, and particularly relates to a multi-stage filtering device. Background Art

[0002] The vibrating filtering device is a commonly used screening and grading device in the current production process. It uses a vibrating motor to vibrate the filter screen, so that the materials on the filter screen vibrate, and the filtering of the materials on the filter screen is completed during the vibration of the filter screen.

[0003] Currently, most filter screens are directly welded or bolted to the support frame. When the filter screen needs to be replaced and cleaned, it often takes a lot of time to separate the filter screen from the support frame, and the installation and disassembly processes are relatively cumbersome. Summary of the Utility Model

[0004] The main purpose of the utility model is to propose a multi-stage filtering device, aiming to solve the technical problem that the installation and disassembly processes of the filter screen of the existing multi-stage filtering device are relatively cumbersome.

[0005] To achieve the above purpose, the utility model proposes a multi-stage filtering device, including:

[0006] A box body, the box body has a filtering cavity, a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are respectively communicated with the filtering cavity, and the filtering cavity has an installation opening arranged upwardly and openly;

[0007] A primary filtering mechanism, the primary filtering mechanism is arranged in the filtering cavity;

[0008] A secondary filtering mechanism, the secondary filtering mechanism is arranged in the filtering cavity at an interval from the primary filtering mechanism;

[0009] Wherein, the secondary filtering mechanism includes a vibrating support, at least one secondary filter screen and a driving mechanism, the vibrating support is reciprocally movably arranged in the filtering cavity, the at least one secondary filter screen is detachably installed on the vibrating support from the installation opening, and the driving mechanism is arranged in the filtering cavity to drive the vibrating support to drive the at least one secondary filter screen to vibrate.

[0010] In some embodiments, the secondary filtering mechanism further includes a clamping member, the vibrating support is provided with a slot extending downward from top to bottom, the slot has a notch arranged upwardly and openly, the notch is communicated with the installation opening, the secondary filter screen is detachably inserted into the slot from the installation opening and the notch, and the clamping member is used to clamp the at least one secondary filter screen to the vibrating support.

[0011] In some embodiments, a bearing member extending laterally is provided at the bottom of the vibration bracket, and a first limiting member and a second limiting member extending on the same side as the bearing member are respectively provided on both sides of the vibration bracket. The bearing member, the first limiting member, and the second limiting member are respectively bent towards the inner side of the vibration bracket, and the slot is formed between the bearing member and the first limiting member and the second limiting member.

[0012] In some embodiments, the vibration bracket includes a first straight portion and at least one first bent portion connected to the first straight portion. The first straight portion and the at least one first bent portion both have a distance from the inner side wall of the box body, and a secondary filter screen is provided on both the first straight portion and the at least one first bent portion.

[0013] In some embodiments, the primary filtering mechanism and / or the secondary filtering mechanism are arranged along the axial direction of the box body.

[0014] In some embodiments, the secondary filtering mechanism further includes at least one first elastic member and at least one second elastic member. The at least one first elastic member connects the top of the vibration bracket to the top of the box body, and the at least one second elastic member connects the bottom of the vibration bracket to the bottom of the box body.

[0015] In some embodiments, the secondary filtering mechanism further includes at least one elastic sealing member, and the at least one elastic sealing member is sealingly connected to the bottom of the vibration bracket and the bottom of the box body.

[0016] In some embodiments, the multi-stage filtering device further includes a rectifying mechanism, which is arranged in the filtering cavity and is spaced from the primary filtering mechanism. The rectifying mechanism is used to rectify the flowing water into a laminar flow state;

[0017] And / or, at least one sewage outlet is provided at the bottom of the box body, and the multi-stage filtering device further includes a sewage discharging mechanism, which is connected to the at least one sewage outlet and is used to discharge the sediment at the bottom of the box body.

[0018] In some embodiments, the primary filtering mechanism includes a first filtering component, and the first filtering component includes a first primary filter screen, and the first primary filter screen and the secondary filter screen are spaced from each other in the filtering cavity.

[0019] In some embodiments, the primary filtering mechanism further includes a second filtering component, and the second filtering component includes a filtering bracket and at least one second primary filter screen. The at least one second primary filter screen is installed on the filtering bracket, and the second filtering component is arranged between the first primary filter screen and the secondary filter screen;

[0020] Among them, the filtering bracket includes a second straight portion and at least one second bending portion connected to the second straight portion. The second straight portion and at least one second bending portion are both spaced apart from the inner side wall of the box body, and a second primary filter screen is provided on both the second straight portion and at least one second bending portion.

[0021] For the multi-stage filtering device provided by the present application, a primary filtering mechanism and a secondary filtering mechanism are arranged at intervals in the filtering cavity. The secondary filtering mechanism includes a vibration bracket and at least one secondary filter screen. The vibration bracket is reciprocally movably arranged in the filtering cavity, and at least one secondary filter screen is detachably installed on the vibration bracket from the installation opening. When it is necessary to replace or clean the secondary filter screen, only the secondary filter screen needs to be detached from the vibration bracket and taken out upward from the installation opening, which is convenient to operate, time-saving and labor-saving, and is convenient for cleaning and replacement. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of an embodiment of the multi-stage filtering device of the present utility model;

[0023] Figure 2 is Figure 1 the disassembly schematic diagram of the multi-stage filtering device in

[0024] Figure 3 is a schematic structural diagram of an embodiment of the vibration bracket of the present utility model;

[0025] Figure 4 is Figure 3 the top view of the vibration bracket in

[0026] Figure 5 is the disassembly schematic diagram of an embodiment of the secondary filtering mechanism of the present utility model;

[0027] Figure 6 is a schematic structural diagram of an embodiment of the first filtering component of the present utility model;

[0028] Figure 7 is a schematic structural diagram of an embodiment of the second filtering component of the present utility model.

[0029] Explanation of the Reference Numerals in the Drawings:

[0030] Label Name Label Name 100 Multi-stage filtering device 10 Box body 11 Filter chamber 12 Liquid inlet 13 Liquid outlet 14 Installation port 20 Primary filtering mechanism 30 Secondary filtering mechanism 31 Vibration support 32 Secondary filter screen 311 Slot 312 Notch 313 Carrier 314 First limiting member 315 Second limiting member 316 First straight part 317 First bending part 33 First elastic member 34 Second elastic member 35 Elastic seal 15 Sewage outlet 21 First filtering component 211 First primary filter screen 22 Second filtering component 221 Filter support 222 Second straight part 223 Second bending part

[0031] The realization of the purpose, functional characteristics and advantages of the present utility model will be further described with reference to the embodiments and the drawings. Detailed Embodiments

[0032] The following will clearly and completely describe the solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present utility model.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If this specific posture changes, the directional indications will also change accordingly.

[0034] It should also be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time.

[0035] In addition, the descriptions involving "first", "second", etc. in the present utility model are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0036] An embodiment of the present application provides a multi-stage filtering device 100, which can be applied in a polishing machine to filter out impurities in the polishing liquid to ensure the recycling of the polishing liquid.

[0037] Please refer to Figure 1 and Figure 2 , a multi-stage filtering device 100 according to an embodiment of the present application includes a box body 10, a primary filtering mechanism 20 and a secondary filtering mechanism 30. The box body 10 has a filtering cavity 11, a liquid inlet 12 and a liquid outlet 13. The liquid inlet 12 and the liquid outlet 13 are respectively communicated with the filtering cavity 11, and the filtering cavity 11 has an installation opening 14 that is open upward; the primary filtering mechanism 20 is disposed in the filtering cavity 11; the secondary filtering mechanism 30 is spaced apart from the primary filtering mechanism 20 and disposed in the filtering cavity 11, so as to form a multi-stage filtering effect.

[0038] In this embodiment, the polishing liquid can enter the filtration chamber 11 from the liquid inlet 12, and is filtered successively through the primary filtration mechanism 20 and the secondary filtration mechanism 30, and finally discharged through the liquid outlet 13.

[0039] Among them, the secondary filtration mechanism 30 includes a vibration bracket 31, at least one secondary filter screen 32, and a driving mechanism. The vibration bracket 31 is reciprocally movably arranged in the filtration chamber 11. At least one secondary filter screen 32 is detachably installed on the vibration bracket 31 from the installation port 14. The driving mechanism is arranged in the filtration chamber 11 to drive the vibration bracket 31 to drive at least one secondary filter screen 32 to vibrate.

[0040] In this embodiment, the detachable installation method of the secondary filter screen 32 and the vibration bracket 31 can be snap connection, slide rail connection, etc., which is convenient for the detachment of the secondary filter screen 32 and the vibration bracket 31. Moreover, since the installation port 14 is arranged at the upper end of the box body 10, when it is necessary to replace or clean the secondary filter screen 32, only the secondary filter screen 32 needs to be detached from the vibration bracket 31, and the secondary filter screen 32 can be taken out upward from the installation port 14. The operation is convenient, time-saving and labor-saving, and is convenient for cleaning and replacement.

[0041] In this embodiment, the driving mechanism can be a vibration motor. The vibration motor drives the vibration bracket 31 to drive at least one secondary filter screen 32 to vibrate, so that the impurities vibrate and move on the secondary filter screen 32, thereby facilitating the discharge of the impurities and preventing the impurities in the polishing liquid from blocking the secondary filter screen 32. Specifically in use, the driving mechanism can adopt different vibration frequencies according to different types of debris.

[0042] Of course, in other embodiments, the driving mechanism can also be other power mechanisms, such as a hydraulic mechanism, etc., as long as the purpose of driving the vibration bracket 31 to drive the secondary filter screen 32 to vibrate is achieved. The embodiments of the present application do not make limitations here.

[0043] As a preferred embodiment, the primary filtration mechanism 20 and / or the secondary filtration mechanism 30 are arranged along the axial direction of the box body 10, that is, the multi-stage filtration device 100 of the present application is vertical, which can make full use of space and is convenient for the user to pull out the secondary filter screen 32 upward for replacement. Of course, in other embodiments, the primary filtration mechanism 20 and / or the secondary filtration mechanism 30 are inclined relative to the axial direction of the box body 10.

[0044] In some embodiments, the secondary filtering mechanism 30 further includes a clamping member. The vibration bracket 31 is provided with a slot 311 extending downward from top to bottom. The slot 311 has a notch 312 opening upward. The notch 312 communicates with the installation opening 14. The secondary filter screen 32 is detachably inserted into the slot 311 from the installation opening 14 and the notch 312. The clamping member is used to clamp at least one secondary filter screen 32 to the vibration bracket 31, improving the connection stability between the two and preventing the secondary filter screen 32 from separating from the vibration bracket 31 when following the vibration of the vibration bracket 31.

[0045] In this embodiment, when installing the secondary filter screen 32, the secondary filter screen 32 can be inserted into the slot 311 through the installation opening 14 and aligned with the notch 312. After the secondary filter screen 32 is inserted in place, at least one secondary filter screen 32 is clamped to the vibration bracket 31 by the clamping member, thus completing the installation of the secondary filter screen 32. When it is necessary to disassemble the secondary filter screen 32, the clamping member is controlled to unlock at least one secondary filter screen 32 from the vibration bracket 31. At this time, the user can apply force to the secondary filter screen 32 through the installation opening 14 and the notch 312, and pull the secondary filter screen 32 upward to remove the secondary filter screen 32 from the slot 311, the notch 312 and the installation opening 14 for cleaning or replacing the secondary filter screen 32. In this embodiment, when the secondary filter screen 32 needs to be cleaned or replaced, it can be quickly replaced, avoiding the trouble of screwing when replacing the existing filter screen.

[0046] Exemplarily, the clamping member can be an elbow clamp for clamping the upper end of the secondary filter screen 32 and the upper end of the vibration bracket 31, facilitating quick installation and disassembly. Of course, this is only exemplary, and the clamping member can also be other structures that can be used to clamp the secondary filter screen 32 and the vibration bracket 31. The embodiments of the present application are not limited thereto.

[0047] Please refer to Figure 3 , a bearing member 313 extending laterally is provided at the bottom of the vibration bracket 31. A first limiting member 314 and a second limiting member 315 extending on the same side as the bearing member 313 are respectively provided on both sides of the vibration bracket 31. The bearing member 313, the first limiting member 314, and the second limiting member 315 are respectively bent toward the inner side of the vibration bracket 31, and a slot 311 is formed between the bearing member 313 and the first limiting member 314 and the second limiting member 315.

[0048] In this embodiment, the bearing member 313 is used to bear the secondary filter screen 32, and the first limiting member 314 and the second limiting member 315 are used to limit the secondary filter screen 32 to prevent the secondary filter screen 32 from shifting left and right. The structure for connecting the secondary filter screen 32 and the vibration bracket 31 in this embodiment is simple and easy to implement.

[0049] In this embodiment, the number of the carrier 313, the first limiting member 314, and the second limiting member 315 can be one or more respectively, so as to achieve the effect of limiting the secondary filter screen 32 at multiple positions, and further improve the connection stability between the secondary filter screen 32 and the vibration bracket 31.

[0050] In some embodiments, please refer to Figure 4 , the vibration bracket 31 includes a first straight portion 316 and at least one first bent portion 317 connected to the first straight portion 316. The first straight portion 316 and at least one first bent portion 317 both have a distance from the inner side wall of the box body 10, and a secondary filter screen 32 is arranged on each of the first straight portion 316 and at least one first bent portion 317. With such an arrangement, compared with the straight filter screen, in this embodiment, by bending the secondary filter screen 32, the filtering area of the secondary filter screen 32 is increased, the flow rate is increased, which is beneficial to improving the filtering effect.

[0051] In this embodiment, two first bent portions 317 are provided, which respectively extend from both ends of the first straight portion 316 towards the primary filtering mechanism 20. Of course, in other embodiments, the number of the first bent portions 317 can also be one, three, etc., which is not limited thereto.

[0052] Please refer to Figure 5 , in some embodiments, the secondary filtering mechanism 30 further includes at least one first elastic member 33 and at least one second elastic member 34. At least one first elastic member 33 connects the top of the vibration bracket 31 to the top of the box body 10, and at least one second elastic member 34 connects the bottom of the vibration bracket 31 to the bottom of the box body 10.

[0053] In this embodiment, both the first elastic member 33 and the second elastic member 34 can be springs. By connecting the vibration bracket 31 and the box body 10 with springs, the vibration bracket 31 is balanced and connected inside the box body 10, and can vibrate relative to the box body 10 under the drive of the drive mechanism to drive the secondary filter screen 32 to vibrate.

[0054] Furthermore, the number of the first elastic member 33 and the second elastic member 34 can be respectively set to two or more to improve the balance of the vibration bracket 31.

[0055] In some embodiments, the secondary filtering mechanism 30 further includes at least one elastic sealing member 35. At least one elastic sealing member 35 is hermetically connected to the bottom of the vibration bracket 31 and the bottom of the box body 10. The elastic sealing member 35 can be made of silicone material, and is used for hermetically connecting the bottom of the vibration bracket 31 and the bottom of the box body 10 to prevent debris from flowing through the gap between the bottom of the vibration bracket 31 and the bottom of the box body 10.

[0056] When the liquid enters the filtration chamber 11 through the liquid inlet 12, turbulence will be generated, which affects the sinking of impurities to be filtered out. To solve this problem, in some embodiments, the multi-stage filtration device 100 further includes a rectifying mechanism. The rectifying mechanism is disposed in the filtration chamber 11 and is spaced apart from the primary filtration mechanism 20. The rectifying mechanism is used to rectify the flowing water into a laminar flow state, which plays a role in stabilizing the water flow, reducing turbulence, facilitating the sinking of impurities, and thus facilitating the subsequent discharge of impurities. At the same time, the water flow is smoother, which facilitates the water flow to pass through the primary filtration mechanism 20 and the secondary filtration mechanism 30, and further helps to improve the filtration effect.

[0057] In this embodiment, the rectifying mechanism includes a honeycomb rectifying plate. The honeycomb rectifying plate is spaced apart from the primary filtration mechanism 20 in the filtration chamber 11 to rectify the flowing water into a laminar flow state.

[0058] In some embodiments, at least one sewage outlet 15 is provided at the bottom of the box body 10. In this embodiment, the number of sewage outlets 15 is set to three, one of which is located at the bottom between the primary filtration mechanism 20 and the box body 10, and the other two are located between the primary filtration mechanism 20 and the secondary filtration mechanism 30. Of course, this is only exemplary, and it can also be set to other numbers, such as two, four, five, etc., and is not limited thereto.

[0059] The multi-stage filtration device 100 further includes a sewage discharge mechanism. The sewage discharge mechanism is connected to at least one sewage outlet 15 and is used to discharge the sediment at the bottom of the box body 10. In this embodiment, the sewage discharge mechanism includes a sewage pump and a sewage pipe. The sewage pump is communicated with at least one sewage outlet 15 through the sewage pipe. When the sewage pump works, the sediment at the bottom of the box body 10 is discharged out of the box body 10 through the sewage pipe, so as to prevent the sediment at the bottom of the box body 10 from accumulating too much and affecting the normal filtration function of the primary filtration mechanism 20 and the secondary filtration mechanism 30, and ensure the cleanliness of the box body 10.

[0060] In this embodiment, by setting the sewage discharge mechanism, it is possible to continuously or intermittently discharge the impurities in the box body 10 without stopping the machine, which is beneficial to extending the filtration time of the multi-stage filtration device 100 and improving the filtration efficiency.

[0061] Please refer to Figure 6 In some embodiments, the primary filtration mechanism 20 includes a first filtration component 21. The first filtration component 21 includes a first primary filter screen 211. The first primary filter screen 211 is spaced apart from the secondary filter screen 32 in the filtration chamber 11.

[0062] Please refer to Figure 7, in some embodiments, the primary filtering mechanism 20 further includes a second filtering component 22. The second filtering component 22 includes a filtering bracket 221 and at least one second primary filter screen. The at least one second primary filter screen is installed on the filtering bracket 221, and the second filtering component 22 is disposed between the first primary filter screen 211 and the secondary filter screen 32.

[0063] As a preferred embodiment, the diameters of the filtering holes of the first primary filter screen 211, the second primary filter screen, and the secondary filter screen 32 decrease gradually, achieving gradual filtering with good filtering effect.

[0064] It should be noted that the primary filtering mechanism 20 of this embodiment is not limited to two filtering components, and can also be set to other numbers of filtering components, such as three or more. The mesh numbers of the multi-stage filtering are set according to the requirements of coarse filtering and fine filtering.

[0065] Among them, the filtering bracket 221 includes a second straight portion 222 and at least one second bending portion 223 connected to the second straight portion 222. Both the second straight portion 222 and the at least one second bending portion 223 have a spacing from the inner side wall of the box body 10, and a second primary filter screen is provided on both the second straight portion 222 and the at least one second bending portion 223. With this setting, compared with the straight filter screen, in this embodiment, by bending the second primary filter screen, the filtering area of the second primary filter screen is increased, the flow rate is increased, which is beneficial to improving the filtering effect.

[0066] In this embodiment, there are two second bending portions 223, which respectively extend from both ends of the second straight portion 222 towards the secondary filter screen 32. Of course, in other embodiments, the second bending portion 223 can also be set to one, three, etc., and is not limited thereto.

[0067] The above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation manners of the present utility model. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation manners here. Any obvious changes or modifications derived from the technical solutions of the present utility model still fall within the protection scope of the present utility model.

Claims

1. A multi-stage filtering device, characterized in that: include: A box body, the box body having a filter cavity, a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are respectively connected to the filter cavity, and the filter cavity has a mounting port that is open upward; A primary filtering mechanism, wherein the primary filtering mechanism is disposed in the filtering cavity; A secondary filtering mechanism, the secondary filtering mechanism and the primary filtering mechanism are arranged in the filtering cavity at intervals; Wherein, the secondary filtering mechanism includes a vibration bracket, at least one secondary filter screen and a driving mechanism. The vibration bracket can be reciprocated and arranged in the filter chamber. The at least one secondary filter screen can be detachably installed on the vibration bracket from the installation port. The driving mechanism is arranged in the filter chamber to drive the vibration bracket to drive the at least one secondary filter screen to vibrate.

2. The multi-stage filtering device according to claim 1, characterized in that: The secondary filtering mechanism also includes a clamping piece, the vibration bracket is provided with a slot extending from top to bottom, the slot has a notch opened upward, the notch is connected to the mounting port, the secondary filter net is detachably inserted into the slot from the mounting port and the notch, and the clamping piece is used to clamp the at least one secondary filter net to the vibration bracket.

3. The multi-stage filtering device according to claim 2, characterized in that: A bearing member extending laterally is provided at the bottom of the vibration bracket, and a first limiting member and a second limiting member extending on the same side as the bearing member are respectively provided on both sides of the vibration bracket, the bearing member, the first limiting member and the second limiting member are respectively bent toward the inner side of the vibration bracket, and the slot is formed between the bearing member and the first limiting member and the second limiting member.

4. The multi-stage filtering device according to claim 2, characterized in that: The vibration bracket includes a first straight portion and at least one first bent portion connected to the first straight portion, the first straight portion and the at least one first bent portion are spaced apart from the inner wall of the box body, and a secondary filter is disposed on the first straight portion and the at least one first bent portion.

5. The multi-stage filtering device according to any one of claims 1 to 4, characterized in that: The primary filtering mechanism and / or the secondary filtering mechanism are arranged along the axial direction of the box body.

6. The multi-stage filtering device according to any one of claims 1 to 4, characterized in that: The secondary filtering mechanism also includes at least one first elastic member and at least one second elastic member, wherein the at least one first elastic member connects the top of the vibration support and the top of the box, and the at least one second elastic member connects the bottom of the vibration support and the bottom of the box.

7. The multi-stage filtering device according to any one of claims 1 to 4, characterized in that: The secondary filtering mechanism further comprises at least one elastic seal, and the at least one elastic seal seals and connects the bottom of the vibration support with the bottom of the box body.

8. The multi-stage filtering device according to any one of claims 1 to 4, characterized in that: The multi-stage filtering device further comprises a rectifying mechanism, which is arranged in the filtering cavity and spaced apart from the primary filtering mechanism, and is used to rectify the water flow passing through into a horizontal flow state; And / or, at least one sewage outlet is provided at the bottom of the box body, and the multi-stage filtering device further comprises a sewage discharge mechanism, and the sewage discharge mechanism is connected to the at least one sewage outlet and is used to discharge the sediment at the bottom of the box body.

9. The multi-stage filtering device according to any one of claims 1 to 4, characterized in that: The primary filter mechanism comprises a first filter assembly, the first filter assembly comprises a first primary filter screen, and the first primary filter screen and the secondary filter screen are arranged in the filter cavity at intervals.

10. The multi-stage filtering device according to claim 9, characterized in that: The primary filter mechanism further comprises a second filter assembly, the second filter assembly comprises a filter support and at least one second primary filter screen, the at least one second primary filter screen is mounted on the filter support, and the second filter assembly is arranged between the first primary filter screen and the secondary filter screen; Wherein, the filter support includes a second straight portion and at least one second bent portion connected to the second straight portion, the second straight portion and the at least one second bent portion are spaced apart from the inner wall of the box body, and the second straight portion and the at least one second bent portion are each provided with a second primary filter net.

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