Filter screen replacement device and power distribution cabinet

Abstract

The utility model relates to a filter screen replacing device and a power distribution cabinet, the filter screen replacing device comprises a driving mechanism, a driving filter screen reel, a driven filter screen reel, a filter screen and two crimping parts, the driving filter screen reel and the driven filter screen reel are oppositely arranged in parallel, two opposite side edges of the filter screen are respectively provided with two raised lines, and the two raised lines are connected with the driving mechanism. The other two opposite side edges of the filter screen are respectively connected with the driving filter screen reel and the driven filter screen reel; the driving mechanism is in transmission connection with the driving filter screen reel and drives the driving filter screen reel to rotate; and the two crimping parts are respectively arranged on the other two opposite side edges of the filter screen and are crimped on the filter screen on the inner sides of the two raised lines. According to the utility model, the raised lines are arranged at the side edges of the filter screen, when the crimping parts are crimped with the side edges of the filter screen, the raised lines and the crimping parts form a limiting structure, so that the edges of the side edges of the filter screen can be prevented from retracting, and the edges of the filter screen cannot be warped under the action of the crimping parts; and the covering and filtering effects of the filter screen on the grid area of the power distribution cabinet are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field related to filter screen replacement, in particular to a filter screen replacement device and a power distribution cabinet. Background Art

[0002] At the bottom of a wind power tower, several electrical devices are configured to cooperate with the normal operation of a wind turbine and are placed in a power distribution cabinet. Usually, multiple areas for air intake are provided with grids on the cabinet door, and a fresh air fan is arranged at the rear side of the power distribution cabinet body to realize the circulation of air flow inside the cabinet body, so as to achieve the purpose of taking away the heat dissipated by the electrical devices. Since the wind turbine is arranged in a field environment, there are many pollutants such as dust and poplar cotton, so a filter screen is covered on the grid area to block the entry of pollutants.

[0003] There are matching finished filter screens on the market, which are installed on the cabinet door by screws and can be replaced manually regularly. However, due to many deficiencies in manual replacement, technicians have developed filter screen replacement devices such as those with the publication number CN205402932U (disclosing a filter membrane automatic replacement device and a fresh air purifier), CN107192115A (disclosing a novel filter screen replacement device), and CN101400243A (disclosing a filter screen replacement system). The filter screen replacement device usually includes a driving filter screen reel, a driven filter screen reel, and a filter screen connected between the two. When the filter screen needs to be replaced, the motor drives the driving filter screen reel, so that the used filter screen is wound on the driving filter screen reel, and at the same time, a section of unused filter screen wound on the driven filter screen reel is pulled out to achieve the purpose of filter screen replacement.

[0004] During the filter screen replacement process, for some filter screens (filter membranes) with soft materials, due to the pulling of the driving filter screen reel, the middle two sides of the filter screen will have a waist shrinkage, resulting in the exposure of the grid and affecting the filtration of pollutants; in addition, for some filter screens with hard materials, the two sides of the partial area may have a phenomenon of edge warping, which may also affect the filtration effect. Summary of the Utility Model

[0005] The utility model provides a filter screen replacement device and a power distribution cabinet to solve one or several of the technical problems existing in the prior art.

[0006] The technical solution of the utility model to solve the above technical problems is as follows: A filter screen replacement device includes a driving mechanism, a driving filter screen reel, a driven filter screen reel, a filter screen, and two pressing parts. The driving filter screen reel and the driven filter screen reel are arranged parallel and opposite to each other. Two convex strips are respectively arranged on the opposite two sides of the filter screen. The opposite two sides of the filter screen are respectively connected to the driving filter screen reel and the driven filter screen reel. The driving mechanism is in transmission connection with the driving filter screen reel and drives the driving filter screen reel to rotate; the two pressing parts are respectively arranged at the opposite two sides of the filter screen and press on the filter screen inside the two convex strips.

[0007] The beneficial effect of the utility model is that the filter replacement device of the utility model provides a convex strip at the side of the filter. When the crimping part is crimped with the side of the filter, the convex strip and the crimping part form a limiting structure, which can prevent the side edge of the filter from shrinking, and under the action of the crimping part, the edge of the filter will not curl, thereby ensuring the coverage and filtering effect of the filter on the grid area of ​​the distribution cabinet.

[0008] On the basis of the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, the crimping portion includes a pressure strip and a connecting piece, the pressure strip is arranged parallel to the extension direction of the convex strip, and the pressure strip is provided with a connecting piece for installation and fixation.

[0010] The beneficial effect of adopting the above further solution is: by providing the pressure strip and the connecting piece, it is convenient to lift the pressure strip and achieve light touch pressure connection of the filter screen without affecting the movement of the filter screen.

[0011] Furthermore, the pressure strip is a long strip structure, comprising a straight section and arc sections located at both ends of the straight section and warped upward, and the straight section is pressed onto the filter screen on the inner side of the two convex strips.

[0012] The beneficial effect of adopting the above further solution is that by providing the arc segment, under the guidance of the arc segment, the filter can be ensured to smoothly enter and exit the gap between the straight segment and the cabinet door, and the pressure strip can be prevented from damaging the filter.

[0013] Furthermore, the connecting piece is formed with an accommodating opening for the convex strip to pass through.

[0014] The beneficial effect of adopting the above further solution is that by providing the receiving opening, the convex strips of the filter screen can be accommodated to avoid interference.

[0015] Furthermore, the connecting member includes a first bending section, a second bending section and a third bending section which are vertically connected in sequence, the first bending section and the third bending section are respectively vertically connected to the head and tail ends of the second bending section and are located on both sides of the second bending section, the free end of the first bending section is fixed to the top surface of the pressure strip, and the third bending section is used for the installation and fixation of the connecting member; the first bending section, the second bending section and the pressure strip are surrounded to form the accommodating opening.

[0016] Furthermore, the pressure strip is provided with at least two connecting pieces for installation and fixation.

[0017] The beneficial effect of adopting the above further solution is that at least two connecting pieces can effectively and stably connect and fix the pressure strip to the cabinet door.

[0018] Further, the convex strip is formed by folding the side edge of the filter screen inward and then pasting or sewing it.

[0019] A power distribution cabinet includes the above-mentioned filter screen replacement device, and also includes a cabinet body and a cabinet door. The cabinet door is installed on the cabinet body. The cabinet door is provided with a grid area. The driving mechanism, the active filter screen reel, the driven filter screen reel and the two crimping parts are all installed on the cabinet door. The active filter screen reel and the driven filter screen reel are respectively located above and below the grid area. The filter screen covers the grid area. A crimping gap for the filter screen to pass through is formed between the crimping part and the cabinet door.

[0020] The beneficial effects of the present utility model are as follows: For the power distribution cabinet of the present utility model, since the filter screen replacement device is arranged on the cabinet body, it is very convenient to obtain power. In order to increase the degree of automation, a timing device can be added, for example, set to replace the filter screen once a month; or a temperature sensor is arranged inside the cabinet. Due to the blockage of the filter screen, the heat dissipation inside the cabinet is not smooth. Set a temperature threshold, and the filter screen can also be automatically replaced after exceeding the threshold. In short, with the help of automation technology, the replacement efficiency of the filter screen can be improved.

[0021] Further, the crimping length of the crimping part in the up and down direction is not less than the width of the grid area in the up and down direction.

[0022] Further, the driving mechanism, the active filter screen reel, the driven filter screen reel, the filter screen and the two crimping parts are all installed on the inner side of the cabinet door;

[0023] Or, the driving mechanism, the active filter screen reel, the driven filter screen reel, the filter screen and the two crimping parts are all installed on the outer side of the cabinet door;

[0024] Or, the cabinet door is respectively provided with strip holes above and below the grid area. The driving mechanism, the active filter screen reel and the driven filter screen reel are all installed on the inner side of the cabinet door. The middle part of the filter screen passes through the two strip holes and is located on the outer side of the cabinet door. The two crimping parts are also installed on the outer side of the cabinet door. Description of the Drawings

[0025] Figure 1 is a schematic structural diagram of the power distribution cabinet according to Embodiment 3 of the present utility model;

[0026] Figure 2 is Figure 1 an enlarged schematic structural diagram of a part of

[0027] Figure 3 is a schematic structural diagram of the power distribution cabinet according to Embodiment 4 of the present utility model Figure 1 ;

[0028] Figure 4 is a schematic structural diagram of the power distribution cabinet according to Embodiment 4 of the present utility modelFigure 2 ;

[0029] Figure 5 is Figure 4 a schematic enlarged view of a partial structure in

[0030] Figure 6 a schematic diagram of the external structure of the cabinet door of the power distribution cabinet according to Embodiment 4 of the present utility model;

[0031] Figure 7 a schematic diagram of the structure of the crimping part of the present utility model;

[0032] Figure 8 a schematic diagram of the structure of the cooperation between the crimping part and the filter screen of the present utility model.

[0033] In the drawings, the list of components represented by each reference numeral is as follows:

[0034] 100, cabinet body; 110, cabinet door; 120, grid area; 130, strip hole; 200, first filter screen replacement device; 210, driving mechanism; 220, active filter screen reel; 230, driven filter screen reel; 240, filter screen; 241, rib; 250, pressing strip; 251, straight section; 252, arc section; 253, connecting piece; 300, second filter screen replacement device. Detailed implementation manners

[0035] The principles and features of the present utility model will be described below with reference to the accompanying drawings. The examples given are only for explaining the present utility model and are not intended to limit the scope of the present utility model.

[0036] Embodiment 1

[0037] Generally, there are multiple grid areas 120 on the cabinet door 110 of the power distribution cabinet 100. For example, as Figure 1 shown, there are six grids on each cabinet door. In order to implement the replacement function with fewer filter screen replacement devices, the two upper grids are regarded as one grid, and the four lower grids are regarded as one grid, and a filter screen replacement device is configured respectively. The upper one is the first filter screen replacement device 200, and the lower one is the second filter screen replacement device 300. The structures of the filter screen replacement devices are the same, except that the length of the pressing strip 250 needs to be designed according to the width of the grid. The width of the grid mentioned here is the length in the vertical direction. Hereinafter, this embodiment will be described in detail according to the first filter screen replacement device 200.

[0038] As Figures 1 to 8As shown in the figure, a filter screen replacement device according to this embodiment includes a driving mechanism 210, a driving filter screen reel 220, a driven filter screen reel 230, a filter screen 240, and two crimping parts. The driving filter screen reel 220 and the driven filter screen reel 230 are arranged parallel and opposite to each other. Two convex strips 241 are respectively provided on the opposite sides of the filter screen 240. The other opposite sides of the filter screen 240 are respectively connected to the driving filter screen reel 220 and the driven filter screen reel 230. The driving mechanism 210 is in transmission connection with the driving filter screen reel 220 and drives the driving filter screen reel 220 to rotate. The two crimping parts are respectively arranged at the other opposite sides of the filter screen 240 and are crimped on the filter screen 240 inside the two convex strips 241. Among them, the driving mechanism 210 can select a motor as the driver.

[0039] As Figure 7 shown in the figure, the crimping part of this embodiment includes a pressing strip 250 and a connecting piece 253. The pressing strip 250 is arranged parallel to the extending direction of the convex strip 241, and the connecting piece 253 for installation and fixation is provided on the pressing strip 250. By setting the pressing strip and the connecting piece, it is convenient to set the pressing strip up, realize the light-touch crimping of the filter screen, and does not affect the movement of the filter screen.

[0040] It should be noted here that the state of the pressing strip 250 pressing the filter screen 240 should be a light-touch state to avoid excessive pressure and prevent the driving filter screen reel 220 from driving the filter screen 240 to move.

[0041] As Figure 7 shown in the figure, the pressing strip 250 of this embodiment is of a long-strip structure. The pressing strip 250 includes a straight section 251 and arc sections 252 that are upwardly warped at both ends of the straight section 251. The straight section 251 is crimped on the filter screen 240 inside the two convex strips 241. The straight section 251 is used to lightly press the filter screen 240. After the pressing strip 250 is installed on the cabinet door 110, a gap is provided between the straight section 251 and the cabinet door 110 for the filter screen 240 to pass through. And the length of the straight section 251 should be equal to or greater than the width of the grid area 120 of the filter screen to be installed, so as to better cover the grid area with the filter screen 240. The arc sections 252 are used as guiding structures. During the movement of the filter screen 240, under the guiding action of the arc sections 252, it can ensure that the filter screen 240 smoothly enters and exits the gap between the straight section 251 and the cabinet door 110, and can also prevent the pressing strip 250 from damaging the filter screen 240. The connecting piece 253 is connected to one side of the straight section 251 to make the straight section 251 rise and there is no obstacle below. Specifically, the length of the straight section is greater than or equal to the width of the grid of the filter screen to be installed.

[0042] As Figure 7 and Figure 8As shown, a receiving opening for the rib 241 to pass through is formed on the connecting member 253 of this embodiment. By providing the receiving opening, the rib of the filter screen can be received to avoid interference.

[0043] As Figure 7 and Figure 8 As shown, the connecting member 253 of this embodiment includes a first bending section, a second bending section, and a third bending section that are sequentially and perpendicularly connected. The first bending section and the third bending section are respectively perpendicularly connected to the head and tail ends of the second bending section and are located on both sides of the second bending section. The free end of the first bending section is fixed to the top surface of the pressing strip 250, and the third bending section is used for the installation and fixation of the connecting member 253; a receiving opening is formed by enclosing between the first bending section, the second bending section, and the pressing strip 250. The third bending section extends beyond the bottom surface of the pressing strip. The connecting member 250 is bent to form a Z-shaped structure and is fixedly connected to the straight section 251. The purpose of the straight section 251 rising is to form a gap with the cabinet door 110. Connecting the connecting member 253 to one side of the straight section does not affect the movement of the filter screen 240. The connecting member 253 is bent to form a receiving opening space with the straight section 251, which can receive the rib 241 of the filter screen. The connecting member 253 is provided with mounting holes and is connected to the cabinet door by screws.

[0044] As Figure 7 and Figure 8 As shown, at least two connecting members 253 for installation and fixation are provided on the pressing strip 250 of this embodiment. At least two connecting members 253 can effectively and stably connect and fix the pressing strip 250 to the cabinet door 110.

[0045] In this embodiment, two connecting members 253 are provided on the pressing strip in the first filter screen replacement device 200, and three connecting members 253 are provided on the pressing strip in the second filter screen replacement device 300. It can be understood that the number of connecting members 253 is determined according to the length of the structure of the pressing strip 250. The longer the pressing strip, the more connecting members 253 are required to ensure the stability of the pressing strip 250.

[0046] As Figure 8 As shown, the rib 241 of this embodiment is formed by folding the side edge of the filter screen 240 inward and then pasting or sewing.

[0047] In the filter screen replacement device of this embodiment, when all the filter screens are used up, only the filter screens can be disassembled, and then new filter screens can be installed later.

[0048] It should also be noted that due to the presence of the convex strip 241, when the filter screen 240 is wound around the reel, the edge of the filter screen 240 will be wound more tightly, and the filter screen between the two edges will be wound more loosely. Therefore, this embodiment is applicable to relatively thin filter screens. At the same time, through testing, even if the above phenomenon occurs under the action of the pressing strip, it does not affect the covering effect of the filter screen.

[0049] In the filter screen replacement device of this embodiment, by providing the convex strip 241 at the side of the filter screen 240, when the pressing part is pressed against the side of the filter screen 240, the convex strip 241 and the pressing part form a limiting structure, which can prevent the side edge of the filter screen 240 from retracting, and under the action of the pressing part, the edge of the filter screen 240 will not curl up, ensuring the covering and filtering effect of the filter screen 240 on the grid area 120 of the distribution cabinet.

[0050] Embodiment 2

[0051] A distribution cabinet of this embodiment includes a filter screen replacement device of the above Embodiment 1, and further includes a cabinet body 100 and a cabinet door 110. The cabinet door 110 is installed on the cabinet body 100. The cabinet door 110 is provided with a grid area 120. The driving mechanism 210, the active filter screen reel 220, the driven filter screen reel 230 and two pressing parts are all installed on the cabinet door 110. The active filter screen reel 220 and the driven filter screen reel 230 are respectively located above and below the grid area 120. The filter screen 240 covers the grid area 120, and a pressing gap for the filter screen 240 to pass through is formed between the pressing part and the cabinet door 110.

[0052] In this embodiment, the driving mechanism 210, the active filter screen reel 220, the driven filter screen reel 230, the filter screen 240 and two pressing parts are all installed inside the cabinet door 110;

[0053] A preferred solution of this embodiment is that the pressing length of the pressing part in the up and down direction is not less than the width of the grid area 120 in the up and down direction.

[0054] For the distribution cabinet of this embodiment, since the filter screen replacement device is installed on the cabinet body, it is very convenient to obtain power. In order to increase the degree of automation, a timing device can be added, for example, set to replace the filter screen once a month; or a temperature sensor can be set inside the cabinet. Since the filter screen is blocked and the heat dissipation in the cabinet is not smooth, set a temperature threshold, and the filter screen can also be automatically replaced after exceeding the threshold. In short, with the help of automation technology, the replacement efficiency of the filter screen can be improved.

[0055] Embodiment 3

[0056] Such as Figure 1 and Figure 2As shown in the figure, a power distribution cabinet in this embodiment includes a filter replacement device in the above-mentioned Embodiment 1, and further includes a cabinet body 100 and a cabinet door 110. The cabinet door 110 is installed on the cabinet body 100. A grid area 120 is provided on the cabinet door 110. The driving mechanism 210, the active filter scroll 220, the driven filter scroll 230 and two crimping parts are all installed on the cabinet door 110. The active filter scroll 220 and the driven filter scroll 230 are respectively located above and below the grid area 120. The filter 240 covers the grid area 120. A crimping gap for the filter 240 to pass through is formed between the crimping part and the cabinet door 110.

[0057] In this embodiment, as Figure 1 and Figure 2 shown, the driving mechanism 210, the active filter scroll 220, the driven filter scroll 230, the filter 240 and two crimping parts are all installed on the outer side of the cabinet door 110;

[0058] A preferred solution in this embodiment is that the crimping length of the crimping part in the up and down direction is not less than the width of the grid area 120 in the up and down direction.

[0059] For the power distribution cabinet in this embodiment, since the filter replacement device is arranged on the cabinet body, it is very convenient to obtain power. In order to increase the degree of automation, a timing device can be added. For example, it is set to replace the filter once a month; or a temperature sensor is arranged inside the cabinet. Since the filter is blocked and the heat dissipation in the cabinet is not smooth, a temperature threshold is set, and the filter can also be automatically replaced after the threshold is exceeded. In short, with the help of automated technology, the replacement efficiency of the filter can be improved.

[0060] Embodiment 4

[0061] As Figures 3 to 6 shown, a power distribution cabinet in this embodiment includes a filter replacement device in the above-mentioned Embodiment 1, and further includes a cabinet body 100 and a cabinet door 110. The cabinet door 110 is installed on the cabinet body 100. A grid area 120 is provided on the cabinet door 110. The driving mechanism 210, the active filter scroll 220, the driven filter scroll 230 and two crimping parts are all installed on the cabinet door 110. The active filter scroll 220 and the driven filter scroll 230 are respectively located above and below the grid area 120. The filter 240 covers the grid area 120. A crimping gap for the filter 240 to pass through is formed between the crimping part and the cabinet door 110.

[0062] As Figure 5 and Figure 6As shown in the figure, the cabinet door 110 of this embodiment is respectively provided with strip holes 130 above and below the grid area 120. The driving mechanism 210, the active filter scroll 220, and the driven filter scroll 230 are all installed inside the cabinet door 110. The middle of the filter screen 240 passes through the two strip holes 130 and is located outside the cabinet door 110. The two crimping parts are also installed outside the cabinet door 110.

[0063] It can be seen that, different from Embodiment 2, in this embodiment, except that the filter screen 240 is outside the cabinet door 110, the rest of the structures are arranged inside the cabinet door 110. Compared with the layout method in Embodiment 2, the layout method of this embodiment is more beautiful and does not affect the layout outside the cabinet door. However, it should also be noted that this setting method requires the opening of strip holes 130. If the cabinet door 110 was not originally provided with this structure, it would be more troublesome to open it later. While in Embodiment 2, it is not necessary, and it can be directly installed outside the cabinet door 110. To ensure the smooth passing of the filter screen 240, the length of the strip hole 130 should be greater than the width of the filter screen 240.

[0064] A preferred solution of this embodiment is that the crimping length of the crimping part in the up and down direction is not less than the width of the grid area 120 in the up and down direction.

[0065] For the power distribution cabinet of this embodiment, since the filter replacement device is arranged on the cabinet body, it is very convenient to take power. To increase the degree of automation, a timing device can be added, for example, set to replace the filter once a month; or a temperature sensor can be set inside the cabinet. Since the filter is blocked and the heat dissipation in the cabinet is not smooth, set a temperature threshold, and the filter can also be automatically replaced after exceeding the threshold. In short, with the help of automation technology, the replacement efficiency of the filter can be improved.

[0066] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0067] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0068] In the present utility model, unless otherwise clearly specified and defined, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0069] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0070] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. 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 present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0071] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. A filter replacement device, characterized in that: It includes a driving mechanism, an active filter reel, a driven filter reel, a filter and two crimping parts, the active filter reel and the driven filter reel are arranged parallel to each other, two opposite side edges of the filter are respectively provided with two convex strips, the other opposite side edges of the filter are respectively connected to the active filter reel and the driven filter reel, the driving mechanism is transmission-connected to the active filter reel and drives the active filter reel to rotate; the two crimping parts are respectively arranged at the other opposite side edges of the filter and are crimped onto the filter inside the two convex strips.

2. A filter replacement device according to claim 1, characterized in that: The crimping portion includes a pressure strip and a connecting piece. The pressure strip is arranged parallel to the extending direction of the convex strip, and the pressure strip is provided with a connecting piece for installation and fixing.

3. A filter replacement device according to claim 2, characterized in that: The pressure strip is a long strip structure, comprising a straight section and arc sections located at both ends of the straight section and warped upwards, and the straight section is pressed onto the filter screen on the inner side of the two convex strips.

4. A filter replacement device according to claim 2, characterized in that: The connecting piece is formed with an accommodating opening for the convex strip to pass through.

5. A filter replacement device according to claim 4, characterized in that: The connecting piece includes a first bending section, a second bending section and a third bending section which are vertically connected in sequence. The first bending section and the third bending section are respectively vertically connected to the head and tail ends of the second bending section and are located on both sides of the second bending section. The free end of the first bending section is fixed to the top surface of the pressure strip, and the third bending section is used for the installation and fixation of the connecting piece; the first bending section, the second bending section and the pressure strip together form the accommodating opening.

6. A filter replacement device according to claim 2, characterized in that: The pressure strip is provided with at least two connecting pieces for installation and fixation.

7. A filter screen replacement device according to claim 1, characterized in that: The convex strips are formed by folding the side edges of the filter screen inwardly and then gluing or sewing them.

8. A power distribution cabinet, characterized in that: A filter replacement device comprising any one of claims 1 to 7, further comprising a cabinet body and a cabinet door, wherein the cabinet door is mounted on the cabinet body, a grid area is provided on the cabinet door, the driving mechanism, active filter reel, driven filter reel and two crimping parts are all mounted on the cabinet door, the active filter reel and driven filter reel are respectively located above and below the grid area, the filter covers the grid area, and a crimping gap for the filter to pass through is formed between the crimping part and the cabinet door.

9. A power distribution cabinet according to claim 8, characterized in that: The crimping length of the crimping portion in the up-down direction is not less than the width of the grid region in the up-down direction.

10. A power distribution cabinet according to claim 8, characterized in that: The driving mechanism, the active filter screen reel, the driven filter screen reel, the filter screen and the two crimping parts are all installed on the inner side of the cabinet door; Or, the driving mechanism, the active filter screen reel, the driven filter screen reel, the filter screen and the two crimping parts are all installed on the outside of the cabinet door; Alternatively, the cabinet door is provided with strip holes above and below the grid area respectively, the driving mechanism, active filter reel, and driven filter reel are all installed on the inner side of the cabinet door, the middle part of the filter passes through two strip holes and is located on the outer side of the cabinet door, and two crimping parts are also installed on the outer side of the cabinet door.

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