Filter housing sheet bending device

Abstract

This utility model discloses a filter housing sheet bending device, comprising: an upper die assembly including a bracket, a lifting mechanism, a first elastic module, a second elastic module, and a punching punch; the lifting mechanism is connected to a push plate, the push plate is provided with a deflector; the punching punch is provided with a lifting cavity and a translation groove; a lifting component is slidably connected in the lifting cavity; an outwardly expanding punch is slidably connected in the translation groove; two outwardly expanding punches are connected to the lifting component through a wedge steering module; a linkage arm and a cam are rotatably connected to the punching punch; the linkage arm is provided with a first elongated hole and a second elongated hole; one side of the cam is provided with a deflector, and the other side of the cam is provided with a second shaft pin slidably connected to the second elongated hole; the lifting component is provided with a first shaft pin slidably connected to the first elongated hole; the lower die assembly includes a base and two folding modules; the base is provided with a punching die, and the two folding modules are located on both sides of the punching die. This utility model has high bending efficiency, high consistency in bending processing, and reliable stripping action.

Description

Technical Field

[0001] This utility model relates to the field of filter housing bending, and in particular to a filter housing sheet bending device. Background Technology

[0002] An air filter is a device that uses porous filter materials to capture and purify the gas from a two-phase flow of gas and solid. An air filter mainly consists of a housing and a filter element composed of filter media such as non-woven fabric and fiber filter paper. The housing is usually made of aluminum sheet metal to reduce weight and improve structural strength.

[0003] The performance of the housing affects the sealing and filtration performance of the filter, and the bending of the housing sheet is a crucial step. To improve the structural strength of the filter housing, the housing sheet is usually bent multiple times to form a C-shaped housing structure. In the existing technology, a bending punching device including a bending punch and a bending die is used to perform four alignment bends on the housing sheet, which is cumbersome and has low bending efficiency. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a filter housing sheet bending device, which can efficiently bend and form the housing sheet, and the bending and unloading action is stable and reliable.

[0005] A filter housing sheet bending device according to an embodiment of the present invention includes: The upper die assembly includes a bracket, a lifting mechanism, a first elastic module, a second elastic module, and a punch. The lifting mechanism is connected to a push plate located above the punch, and the push plate is provided with a deflector. The first elastic module connects the bracket and the punch. The punch is provided with a lifting cavity, and both sides of the lifting cavity are provided with translation grooves. A lifting component is slidably connected in the lifting cavity. The second elastic module connects the bracket and the lifting component. An outwardly expanding punch is slidably connected in the translation groove. The two outwardly expanding punches are connected to both sides of the lifting component through a wedge steering module. A linkage arm and a cam are rotatably connected on the punch. The linkage arm has a first long hole and a second long hole on both sides of its rotation axis. One side of the cam is provided with a deflector protrusion that matches the deflector, and the other side of the cam is provided with a second shaft pin that is slidably connected to the second long hole. The lifting component is provided with a first shaft pin that is slidably connected to the first long hole. The lower die assembly includes a base and two folding dies. The base is provided with a punching die that matches the punching punch, and the two folding dies are located on both sides of the punching die.

[0006] In this embodiment, the bottom of the deflector is arc-shaped.

[0007] In this embodiment, the wedge steering module includes a first wedge structure and a second wedge structure. The bottom sides of the lifting member are provided with the first wedge structure, and one side of each outward expansion punch is provided with a second wedge structure that connects to the first wedge structure.

[0008] In this embodiment, the first wedge structure is a dovetail groove inclined to the horizontal plane, and the second wedge structure is a dovetail-shaped slider that matches the dovetail groove.

[0009] In this embodiment, punch sliders are provided at both ends of the outward expansion punch, and punch grooves are provided at both ends of the translation groove. The punch sliders are slidably connected in the punch grooves.

[0010] In this embodiment, the folding module includes a folding drive mechanism and a folding upright plate. The folding upright plate is connected to the folding drive mechanism, and a folding top plate is connected to the side of the folding upright plate near the punching die.

[0011] In this embodiment, both ends of the flanged upright plate are provided with flanged side plates, which protrude from the side of the flanged upright plate near the punching die.

[0012] In this embodiment, the flanged upright plate is provided with a flanged slider, and the base is provided with a flanged groove, which is slidably connected to the flanged slider.

[0013] In this embodiment, the lower die assembly further includes a third elastic module and a pre-clamping plate. The pre-clamping plate is slidably connected in the punching die, and the third elastic module connects the pre-clamping plate and the base.

[0014] In this embodiment, the base is also provided with a buffer baffle located below the pre-clamping plate.

[0015] The embodiments of this utility model have at least the following beneficial effects: By using a punch and die in combination, the center of the shell sheet can be bent into a concave shape. Combined with the folding dies on both sides, the edges of the shell sheet can be folded upwards to form a C-shaped shell structure. Multiple bending operations can be completed in one go, resulting in high bending efficiency and simple loading and unloading bending operations. This effectively reduces manual intervention, improves bending accuracy and consistency, and lowers labor costs. The system utilizes a multi-stage motion transmission chain consisting of a pusher plate, paddle wheel, cam, linkage arm, and lifting components. It can drive the outward expanding punch and the forming punch separately to achieve accurate timing coordination. Before forming and bending, it can drive the outward expanding punch to translate and protrude from the side of the forming punch. After completing the flanging process with the flanging assembly, the outward expanding punch can translate and retract into the translation groove to release the C-shaped shell structure. The stripping action after bending is reliable and the stripping efficiency is high. In addition, the conversion between vertical punching force and horizontal outward expanding driving force is realized through the wedge steering module. The reaction force of the outward expanding punch during the forming and bending process is perpendicular to the horizontal outward expanding driving force, which can effectively improve the reliability of the punching action. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a three-dimensional structural diagram of the filter housing sheet bending device according to an embodiment of the present utility model; Figure 2 This is a three-dimensional structural diagram of the filter housing sheet bending device according to another perspective of an embodiment of the present utility model. Figure 3 This is a front view schematic diagram of the filter housing sheet bending device according to an embodiment of the present utility model; Figure 4 For along Figure 3 A schematic diagram of the cross-sectional structure of line A-A'; Figure 5 For the corresponding Figure 4 A structural schematic diagram under another processing condition; Figure 6 For the corresponding Figure 4 A structural diagram under another processing condition; Figure 7 This is a front view schematic diagram of the filter housing sheet bending device of this utility model in another processing state; Figure 8 This is a partial exploded structural diagram of the filter housing sheet bending device according to an embodiment of the present utility model; Figure 9 This is a schematic diagram of the shell sheet under different processing conditions.

[0017] Figure label: Upper die assembly 100, bracket 110, lifting mechanism 120, push plate 121, deflector 122, first elastic module 130, second elastic module 140, punching punch 150, lifting cavity 151, translation groove 152, punch slide 153, lifting component 160, first shaft pin 161, first wedge structure 162, outwardly expanding punch 170, second wedge structure 171, punch slider 172, linkage arm 180, first elongated hole 181, second elongated hole 182, cam 190, deflecting protrusion 191, second shaft pin 192; The components include: lower mold assembly 200, base 210, punching die 211, flanging slide 212, folding module 220, flanging drive mechanism 221, flanging upright plate 222, flanging top plate 223, flanging side plate 224, flanging slider 225, third elastic module 230, pre-clamping plate 240, and buffer baffle 250. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, left, right, front, and back, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] In the description of this utility model, if the wire sleeve or bracket is mentioned, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0021] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0022] Air filters mainly consist of a housing and a filter element composed of filter media such as non-woven fabric and fiber filter paper. To reduce weight and increase structural strength, the housing is typically made of sheet metal from aluminum plates. The performance of the housing affects the filter's sealing and filtration performance, making the bending and sheet metal processing of the housing a crucial step.

[0023] To improve the structural strength of the filter housing, the housing sheet is usually bent multiple times to form a C-shaped housing structure. In the existing technology, a bending punching device including a bending punch and a bending die is used to perform four alignment bends on the housing sheet. The bending operation is cumbersome and the bending processing efficiency is low. The semi-automatic bending processing with manual assistance requires workers to perform four loading and unloading operations, which will significantly increase the fatigue of workers, resulting in unstable bending consistency of the housing sheet, difficulty in controlling bending accuracy, and large bending errors.

[0024] The following is for reference only. Figure 1 To be continued Figure 9 The present invention describes a filter housing sheet bending device that can efficiently bend and form the housing sheet, and the bending and unloading action is stable and reliable with high unloading efficiency.

[0025] Reference Figures 1 to 9 A filter housing sheet bending device according to an embodiment of the present invention includes: The upper die assembly 100 includes a bracket 110, a lifting mechanism 120, a first elastic module 130, a second elastic module 140, and a punching die 150. The fixed part of the lifting mechanism 120 is connected to the bracket 110, and the driving part of the lifting mechanism 120 is connected to a push plate 121 located above the punching die 150. The lifting mechanism 120 is used to drive the push plate 121 to move vertically to the horizontal plane to achieve lifting motion. The lifting mechanism 120 can be configured as a hydraulic cylinder that outputs lifting driving force. The side of the push plate 121 is provided with a deflector 122. The telescopic ends of the first elastic module 130 are respectively connected to the bracket 110. The punch 150 is provided with a lifting cavity 151, and a translation groove 152 is provided on both sides of the bottom of the lifting cavity 151. A lifting component 160 is slidably connected in the lifting cavity 151. The telescopic ends of the second elastic module 140 are respectively connected to the bracket 110 and the lifting component 160, so that the lifting component 160 forms an upward movement trend. An outwardly expanding punch 170 is slidably connected in each translation groove 152. The two outwardly expanding punches 170 are respectively connected to the opposite sides of the bottom of the lifting component 160 through corresponding inclined wedge steering modules. The outward-expanding punch wedge steering module is used to achieve the motion effect of steering linkage. A linkage arm 180 and a cam 190 are rotatably connected to the punch 150. The middle part of the linkage arm 180 is rotatably connected to the punch 150. The linkage arm 180 has a first elongated hole 181 and a second elongated hole 182 located on opposite sides of the rotation axis of the linkage arm 180. Both the first elongated hole 181 and the second elongated hole 182 are elongated slots, meaning the length of the slot is greater than its width. One side of the cam 190 has a rotating protrusion 191 that matches the deflector 122. The deflector 122 is used to actuate the rotating protrusion 191. A drive cam 190 is rotated. The cam 190 is located on the side of the deflector 122 away from the push plate 121. The deflector 191 is located on the side of the cam 190 close to the push plate 121. The side of the cam 190 away from the push plate 121 is provided with a second shaft pin 192 that is slidably connected to the second elongated hole 182. Preferably, the second shaft pin 192 is rotatably connected to the cam 190, which can improve the smoothness of the operation. The lifting member 160 is provided with a first shaft pin 161 that is slidably connected to the first elongated hole 181. Preferably, the first shaft pin 161 is rotatably connected to the lifting member 160, which can improve the smoothness of the operation. The lower die assembly 200 is located below the upper die assembly 100. The lower die assembly 200 includes a base 210 and two folding modules 220. The base 210 is provided with a punching die 211 that matches the punching punch 150. The base 210 is located below the punching punch 150. The two folding modules 220 are located on opposite sides of the punching die 211. The folding modules 220 are used to drive folding in the horizontal direction. The folding part of the folding module 220 matches the shape of the outwardly expanding punch 170 and is used to bend the edge of the shell sheet into a U-shape.

[0026] The operation process of a filter housing sheet bending device according to an embodiment of this utility model is as follows: I. Preparations for expansion, see reference Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the lifting mechanism 120 drives the push plate 121 to descend. During the descent, the deflector 122 deflects the rotating protrusion 191 to descend, causing the cam 190 to rotate, which in turn causes the second shaft pin 192 to rise synchronously. Through the second elongated hole 182, the linkage arm 180 is driven to rotate around the rotation axis. The end of the linkage arm 180 away from the second shaft pin 192 descends, and through the first elongated hole 181, the first shaft pin 161 is driven to descend, thereby driving the lifting component 160 to descend. Under the steering transmission action of the inclined wedge steering module, the outwardly expanding punch 170 slides along the translation groove 152 away from the lifting cavity 151, thus protruding to the outside of the punching punch 150. The two outwardly expanding punches 170 and the punching punch 150 combine to form an inverted T-shaped punch structure. The shell sheet is placed on the base 210. At this time, the straight shell sheet is referenced. Figure 9 As shown; II. Stamping process, see reference Figure 5 As shown, the lifting mechanism 120 further drives the push plate 121 to descend. The push plate 121 contacts the punching punch 150 and pushes the punching punch 150 to descend. The lifting component 160 and the outward expanding punch 170 descend synchronously. The two outward expanding punches 170 combine with the punching punch 150 to form an inverted T-shaped punch structure, which presses the shell sheet into the punching die 211 to press and bend the shell sheet into a U-shape. At this time, the U-shaped shell sheet is referenced. Figure 9 As shown; III. Flanging process, see reference Figure 5 As shown, the folding module 220 moves horizontally towards the punching die 211 to fold the edge of the shell sheet along the outward-expanding punch 170 toward the punching punch 150, thereby stamping the shell sheet into a C-shape. The C-shaped shell sheet at this time is referenced... Figure 9 As shown; IV. Shrinkage and desizing, see reference. Figure 6 and Figure 7As shown, the folding module 220 moves away from the punching die 211 and moves backward. The lifting mechanism 120 drives the push plate 121 to rise. Under the elastic restoring force of the first elastic module 130, the two outwardly expanding punches 170 and the punching punch 150 combine to form an inverted T-shaped punch structure, which then moves away from the punching die 211 and rises. The deflector 122 releases the deflector 191 and rises to release the limit formed on the cam 190. The lifting component 160 rises under the elastic restoring force of the second elastic module 140. Under the motion state steering transmission of the wedge steering module, the outwardly expanding punch 170 slides along the translation groove 152 close to the lifting cavity 151 so that the outwardly expanding punch 170 is housed in the translation groove 152. At this time, the outwardly expanding punch 170 is disengaged from the C-shaped shell sheet. The C-shaped shell sheet, which has lost its locking position, is disengaged from the punching punch 150 under the action of gravity, thereby achieving reliable material removal.

[0027] By using the punching punch 150 in conjunction with the punching die 211, the middle part of the shell sheet can be bent by punching and recessing. Furthermore, with the folding dies 220 on both sides, the edges of the shell sheet can be folded upwards to form a C-shaped shell structure. Multiple bending operations can be achieved in a single loading and unloading operation, resulting in high bending efficiency and simple loading and unloading bending operations. This effectively reduces manual intervention, not only reducing operational errors caused by fatigue and improving bending accuracy, but also ensuring high consistency in bending processes and lowering labor costs. Through a multi-stage motion transmission chain consisting of the push plate 121, the deflector 122, the cam 190, the linkage arm 180, and the lifting component 160, the outward expanding punch 170 and the punching punch 150 can be driven respectively. With precise timing coordination, before punching and bending, the outward-expanding punch 170 can be driven to translate and protrude from the side of the punching punch 150 to form an inverted T-shaped punch structure. After the flanging process is completed with the flanging assembly, the outward-expanding punch 170 can be driven by the second elastic module 140 to translate and retract into the translation groove 152 to release the C-shaped shell structure. The stripping action after bending is reliable, which can effectively reduce the stripping difficulty and achieve high stripping efficiency. In addition, the conversion between vertical punching force and horizontal outward-expanding driving force is realized through the wedge steering module. The reaction force of the outward-expanding punch 170 during the punching and bending process is perpendicular to the horizontal outward-expanding driving force, which can effectively improve the reliability of the punching action and prevent the outward-expanding punch 170 from retracting into the translation groove 152 due to the reaction force during the punching process.

[0028] Understandably, the bottom of the deflector 122 is arc-shaped. The arc-shaped deflector 122 is used to push the deflector 191 of the cam 190, which can effectively improve the smoothness of the deflector action. It can not only improve the reliability of the action when the outward expansion punch 170 is pushed outward, but also effectively reduce the collision impact between structures, thereby effectively extending the service life of the overall structure.

[0029] It is understood that the wedge steering module includes a first wedge structure 162 and a second wedge structure 171. A first wedge structure 162 is provided on both sides of the bottom of the lifting member 160. Each outwardly expanding punch 170 is provided with a second wedge structure 171 that matches and connects to the first wedge structure 162 on the side near the lifting cavity 151. The first wedge structure 162 and the second wedge structure 171 form a steering linkage motion effect.

[0030] Specifically, the first wedge structure 162 is a dovetail groove inclined to the horizontal plane, that is, the first wedge structure 162 is a dovetail groove inclined to the lifting direction of the push block, and the second wedge structure 171 is a dovetail-shaped slider matched with the dovetail groove. Through the dovetail groove and the dovetail slider inclined to the horizontal plane, the movement and steering between the punching lifting part 160 and the outward expanding punch 170 can be realized, and the steering effect is reliable and the structure is stable.

[0031] It is understood that each end of the outward expanding punch 170 is provided with a punch slider 172, and each end of the translation groove 152 is provided with a punch groove 153 that matches the punch slider 172. The extension direction of the punch groove 153 is parallel to the horizontal plane, and the extension direction of the punch slider 172 is perpendicular to the extension direction of the translation groove 152. The punch slider 172 is slidably connected in the punch groove 153. Through the cooperation of the punch slider 172 and the punch groove 153, a reliable guiding effect can be provided for the translation and extension action of the outward expanding punch 170. The structure is reliably distributed and the assembly, maintenance and other operations are convenient.

[0032] It is understood that the folding module 220 includes a flanging drive mechanism 221 and a flanging upright plate 222. The flanging drive mechanism 221 is connected to the base 210, and the flanging upright plate 222 is connected to the flanging drive mechanism 221. The flanging drive mechanism 221 is used to drive the flanging upright plate 222 to slide horizontally. The sliding direction of the flanging upright plate 222 is the same as the translation direction of the outward expansion punch 170. The flanging drive mechanism 221 can be a cylinder that outputs horizontal driving force. The two flanging upright plates 222 are located on opposite sides of the punching die 211. On the side, two flanged upright plates 222 are distributed parallel to each other in the front-to-back direction, and two outward expanding punches 170 are also distributed parallel to each other in the front-to-back direction. A flanged top plate 223 is connected to the side of the flanged upright plate 222 near the punching die 211. The 7-shaped flanged structure formed by the flanged upright plate 222 and the flanged top plate 223 matches the shape of the outward expanding punch 170 and is used to bend the edge of the shell into a U-shape. It can form a reliable limiting effect on the edge of the shell sheet, thereby effectively realizing the 180-degree flanged action. The flanged action is stable and reliable.

[0033] Specifically, the bottom of the flanged top plate 223 near the punching die 211 is provided with an arc-shaped anti-collision surface. The arc-shaped anti-collision surface can effectively prevent the flanged top plate 223 from scratching the shell sheet, thereby effectively improving the reliability of the flanged processing action.

[0034] It is understandable that both ends of the flanged upright plate 222 are provided with flanged side plates 224, and the flanged side plates 224 protrude from the side of the flanged upright plate 222 near the punching die 211. The two flanged side plates 224 can provide a positioning reference for the alignment of the shell sheet.

[0035] When the shell sheet is fed in, the flanged upright plate 222 and the two flanged side plates 224 at its opposite ends form a U-shaped surrounding structure, which can provide a reliable alignment base for the shell sheet. The shell sheet is fed to the plate wall that abuts the flanged upright plate 222 and the flanged side plates 224. The feeding and alignment operation is convenient, the positioning effect is reliable, and it can effectively improve the accuracy of bending and forming.

[0036] It is understood that the flange plate 222 is provided with a flange slider 225, and the base 210 is provided with a flange groove 212 that matches the flange slider 225. The flange groove 212 is slidably connected to the flange slider 225. The extension direction of the flange groove 212 is parallel to the driving direction of the flange driving mechanism 221. The flange groove 212 and the flange slider 225 can effectively improve the reliability of the push block translation operation and further improve the stability of the flange operation.

[0037] Understandably, the lower die assembly 200 also includes a third elastic module 230 and a pre-clamping plate 240. The pre-clamping plate 240 is slidably connected to the punching die 211. The telescopic ends of the third elastic module 230 are respectively connected to the pre-clamping plate 240 and the base 210, so that the pre-clamping plate 240 forms an upward movement trend. The third elastic module 230 forms an upward pre-tightening force on the pre-clamping plate 240, which, together with the punching punch 150, can form a dynamic clamping positioning effect.

[0038] During the stamping process, the lifting mechanism 120 drives the push plate 121 to descend. The two outwardly expanding punches 170 and the stamping punch 150 combine to form an inverted T-shaped punch structure, which presses the shell sheet onto the pre-clamping plate 240. The clamped pre-clamping plate 240 descends continuously and is stamped into the stamping die 211, which can effectively reduce the vibration generated during the stamping of the shell sheet, thereby effectively improving the reliability of the bending and forming action.

[0039] Understandably, the base 210 is also equipped with a buffer baffle 250 located below the pre-clamping plate 240. The buffer baffle 250 can effectively limit the extreme position of the pre-clamping plate 240, thereby effectively controlling the bending depth during the punching process, and ensuring stable and reliable bending operation. The buffer baffle 250 can specifically be a rubber pad.

[0040] It should be noted that the first elastic module 130, the second elastic module 140 and the third elastic module 230 can all be configured as the following elastic telescopic mechanism: including a guide sleeve, a guide post, a spring and a limiting block. The guide post is slidably connected in the guide sleeve, the limiting block is connected to one end of the guide post, the other end of the guide post is the first telescopic end of the elastic telescopic mechanism, the guide sleeve is the other telescopic end of the elastic telescopic mechanism, the spring is sleeved outside the guide post, and the two ends of the spring abut against the limiting block and the guide sleeve respectively, so that the limiting plate forms a movement tendency away from the guide sleeve.

[0041] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A filter housing sheet bending device, characterized in that, include: The upper die assembly (100) includes a bracket (110), a lifting mechanism (120), a first elastic module (130), a second elastic module (140), and a punch (150). The lifting mechanism (120) is connected to a push plate (121) located above the punch (150). The push plate (121) is provided with a deflector (122). The first elastic module (130) connects the bracket (110) and the punch (150). The punch (150) is provided with a lifting cavity (151). Both sides of the lifting cavity (151) are provided with translation grooves (152). A lifting component (160) is slidably connected in the lifting cavity (151). The second elastic module (140) connects the bracket (110) and the lifting component. (160), an outward expansion punch (170) is slidably connected in the translation groove (152). The two outward expansion punches (170) are connected to both sides of the lifting member (160) through a wedge steering module. A linkage arm (180) and a cam (190) are rotatably connected on the punch (150). The linkage arm (180) has a first long hole (181) and a second long hole (182) on both sides of its rotation axis. One side of the cam (190) has a rotating protrusion (191) that matches the deflector (122). The other side of the cam (190) has a second shaft pin (192) that is slidably connected to the second long hole (182). The lifting member (160) has a first shaft pin (161) that is slidably connected to the first long hole (181). The lower die assembly (200) includes a base (210) and two folding dies (220). The base (210) is provided with a punching die (211) that matches the punching punch (150). The two folding dies (220) are located on both sides of the punching die (211).

2. The filter housing sheet bending device according to claim 1, characterized in that, The bottom of the flap (122) is arc-shaped.

3. The filter housing sheet bending device according to claim 1, characterized in that, The wedge steering module includes a first wedge structure (162) and a second wedge structure (171). The first wedge structure (162) is provided on both sides of the bottom of the lifting member (160), and a second wedge structure (171) connected to the first wedge structure (162) is provided on one side of each of the outward expansion punches (170).

4. The filter housing sheet bending device according to claim 3, characterized in that, The first wedge structure (162) is a dovetail groove inclined to the horizontal plane, and the second wedge structure (171) is a dovetail-shaped slider that matches the dovetail groove.

5. A filter housing sheet bending device according to claim 1, characterized in that, The outer expansion punch (170) has punch sliders (172) at both ends, and the translation groove (152) has punch grooves (153) at both ends. The punch sliders (172) are slidably connected in the punch grooves (153).

6. The filter housing sheet bending device according to claim 1, characterized in that, The folding module (220) includes a folding drive mechanism (221) and a folding stand plate (222). The folding stand plate (222) is connected to the folding drive mechanism (221), and a folding top plate (223) is connected to the side of the folding stand plate (222) near the punching die (211).

7. A filter housing sheet bending device according to claim 6, characterized in that, Both ends of the flanged upright plate (222) are provided with flanged side plates (224), and the flanged side plates (224) protrude from the side of the flanged upright plate (222) near the punching die (211).

8. A filter housing sheet bending device according to claim 6 or 7, characterized in that, The flanged upright plate (222) is provided with a flanged slider (225), and the base (210) is provided with a flanged groove (212), which is slidably connected to the flanged slider (225).

9. A filter housing sheet bending device according to claim 1, characterized in that, The lower die assembly (200) further includes a third elastic module (230) and a pre-clamping plate (240), the pre-clamping plate (240) being slidably connected in the punching die (211), and the third elastic module (230) connecting the pre-clamping plate (240) and the base (210).

10. A filter housing sheet bending device according to claim 9, characterized in that, The base (210) is also provided with a buffer baffle (250) located below the pre-clamp plate (240).

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