Adjustable door sagging prevention device and electric cabinet

Abstract

The utility model relates to the technical field of door accessories, in particular to an adjustable door sagging prevention device and an electric cabinet, and the adjustable door sagging prevention device comprises a supporting assembly and a roller assembly; the supporting assembly comprises a bottom frame, an adjusting plate, a supporting block and a fastener, and the adjusting plate is clamped and fixed to the bottom frame through the fastener. The supporting block is fixedly connected to the adjusting plate; the roller assembly comprises a roller support, a rotating shaft and a roller, and the roller is rotatably connected to the roller support through the rotating shaft; in the door closing state, the lower side of the supporting block abuts against the upper side of the rolling wheel. The adjusting plate is provided with the adjusting long hole in the vertical direction in a penetrating mode, the mounting height of the adjusting plate and the mounting height of the supporting block can be flexibly adjusted, the mounting height of the supporting block is matched with the mounting height of the rolling wheel, door closing blocking is avoided, and the door can be prevented from drooping in the door closing state; the technical problems that after a supporting block of an existing door sagging prevention device is welded, the installation height is difficult to adjust, the device cannot play a role easily, and door closing is blocked are solved.

Description

Technical Field

[0001] This utility model relates to the field of door fittings technology, and in particular to an adjustable anti-door sagging device and an electrical cabinet. Background Technology

[0002] The cabinet door of an electrical control cabinet is typically fixed to the cabinet body via hinges. Due to the weight of the door, the hinges can easily weaken and deform under the pressure of the door's weight after prolonged use, causing the door to sag and fail to close properly. Existing anti-sag devices usually include a support block and rollers. The support block is welded to the door, and the rollers are mounted on the cabinet body. When the door is closed, the lower side of the support block abuts against the rollers, thus transferring the weight of the door to the cabinet body via the support block and rollers, preventing the door from sagging. This existing anti-door sagging device is compact and widely used. However, because the support block is directly welded to the cabinet door, it is difficult to adjust the installation height of the support block after welding. Therefore, the welding and installation precision requirements for the support block are extremely high. If the welding position of the support block is too high, the support block will separate from the roller when the door is closed, causing the entire device to fail to prevent the cabinet door from sagging. If the welding position of the support block is too low, the support block will collide with the roller when the door is closed, causing the door to be obstructed and unable to close. Utility Model Content

[0003] In response to the problems raised in the background art, the purpose of this utility model is to propose an adjustable door sagging prevention device, which can flexibly adjust the installation height of the support block to match the installation height of the roller, and is convenient to debug and operate, improving the flexibility and practicality of the device installation. It solves the technical problem that the installation height of the support block of the existing door sagging prevention device is difficult to adjust after welding, which leads to the device being unable to function and the door being obstructed from closing.

[0004] Another objective of this utility model is to provide an electrical cabinet that, by employing the aforementioned adjustable anti-sag device, can effectively prevent the cabinet door from sagging, thus solving the technical problem of existing electrical cabinet doors being prone to sagging.

[0005] To achieve the above objectives, this utility model proposes an adjustable door sagging prevention device, including a support assembly and a roller assembly. The support assembly includes a base frame, an adjusting plate, a support block, and fasteners. The base frame has a first through hole. The adjusting plate is detachably connected to the base frame and has an adjusting elongated hole arranged vertically through it, corresponding to the first through hole. During installation, the fastener passes through the adjusting elongated hole and the first through hole in sequence to clamp and fix the adjusting plate to the base frame. The support block is fixedly connected to the adjusting plate. The roller assembly includes a roller bracket, a rotating shaft, and a roller. The roller is rotatably connected to the roller bracket via the rotating shaft. In the closed state, the lower side of the support block abuts against the upper side of the roller.

[0006] Optionally, the lower end of the bottom frame is provided with a first support plate that folds backward, the lower end of the adjustment plate is provided with a second support plate that folds backward, and a support member is provided between the first support plate and the second support plate. The lower part of the support member is fixedly connected to the first support plate, and the upper part of the support member is fixedly connected to the second support plate.

[0007] Optionally, the first support plate is provided with a second through hole, the second support plate is provided with a third through hole, the support member is a bolt, and the support member passes through the second through hole and the third through hole and is fastened to a nut.

[0008] Optionally, the side of the bottom frame is connected to a forward-folding frame, and a rivet nut is provided at the front end of the bottom frame corresponding to the first through hole. The fastener is a bolt, which passes through the adjustment elongated hole and is then fastened to the rivet nut.

[0009] Optionally, the frame is connected to an outwardly folded edge, the surface of which is parallel to the surface of the bottom frame.

[0010] Optionally, the support block has a V-shaped structure that is wider at the front and narrower at the back, with the rear of the support block facing the roller bracket when the door is closed. The roller bracket includes an upper connector, a right connector, and a left connector, which are respectively located on the upper, right, and left sides of the roller bracket. The upper end of the right connector is connected to the right end of the upper connector, and the lower end of the right connector is connected to the right end of the rotating shaft. The upper end of the left connector is connected to the left end of the upper connector, and the lower end of the left connector is connected to the left end of the rotating shaft. The upper connector, the right connector, and the left connector are connected to form a cavity for the support block to be inserted.

[0011] Optionally, the lower rear end of the support block is inclined upward to form a buffer slope.

[0012] This utility model also proposes an electrical cabinet, including a cabinet door, a cabinet body, and an adjustable anti-door sagging device as described in any one of the above, wherein the support assembly is installed on the cabinet door, and the roller assembly is installed on the cabinet body.

[0013] Optionally, a first connecting plate is fixedly connected to the upper side of the roller bracket, and the cabinet is provided with a fixed bracket, which includes a fixed crossbar, and the fixed crossbar is detachably connected to the first connecting plate.

[0014] Optionally, a second connecting plate is fixedly connected to the right side of the roller bracket, and the fixed bracket further includes a fixed vertical rod, which is detachably connected to the right end of the second connecting plate.

[0015] Compared with the prior art, the embodiments of this utility model have the following beneficial effects:

[0016] 1. By setting a base frame and an adjustment plate, and by having an adjustment elongated hole running vertically through the adjustment plate, the installation height of the adjustment plate can be flexibly adjusted up and down within the longitudinal length range of the adjustment elongated hole. This adjusts the installation height of the support block fixedly connected to the adjustment plate accordingly, ultimately matching the installation height of the support block with that of the roller. This prevents obstruction when closing the door, and when the door is closed, the lower side of the support block abuts against the upper side of the roller. Thus, the weight of the cabinet door is borne by the support block and the roller, reducing the weight of the cabinet door borne by the door hinge and effectively preventing the door from sagging. This solves the technical problem of existing anti-door sagging devices where the installation height of the support block is difficult to adjust after welding, leading to the device's ineffectiveness and obstruction when closing the door. This improves the flexibility and practicality of the device's installation.

[0017] 2. By setting a support between the first support plate and the second support plate, longitudinal support can be provided between the bottom frame and the adjustment plate, which enhances the stability of the connection between the bottom frame and the adjustment plate. This prevents the fasteners between the bottom frame and the adjustment plate from loosening under the long-term pressure of the cabinet door weight, thus preventing the entire device from failing to prevent the door from sagging. This improves the durability of the device, and it has high overall strength and a wide range of applications, especially suitable for larger cabinet doors.

[0018] 3. By designing the support block with a V-shaped structure that is wider at the front and narrower at the back, and the roller bracket with a door frame shape and a cavity, the support block can be smoothly inserted into the cavity and abut against the roller when the door is closed. This effectively prevents the support block from colliding with the roller bracket and thus avoiding obstruction when closing the door. Furthermore, by designing the roller bracket with a door frame shape, the weight of the cabinet door borne by the roller can be evenly distributed to the roller bracket through the left and right ends of the pivot after the door is closed. This avoids stress concentration on a single point on the roller or roller bracket, which could lead to damage to the entire roller assembly, further enhancing the structural stability and durability of the roller assembly. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the adjustable door sagging device after the support component and roller component are assembled according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the support assembly of an adjustable door sagging device according to an embodiment of the present invention.

[0021] Figure 3 This is an exploded view of the support assembly of an adjustable door sagging device according to an embodiment of the present invention (fasteners and support members used for connection are omitted in the figure).

[0022] Figure 4 This is a schematic diagram of the bottom frame of the support assembly of an adjustable door sagging device according to an embodiment of the present invention.

[0023] Figure 5 This is a schematic diagram of the roller assembly of an adjustable door sagging device according to an embodiment of the present invention.

[0024] Figure 6 This is a schematic diagram of an adjustable anti-door sagging device installed in an electrical cabinet and in the closed state, according to an embodiment of the present invention.

[0025] Figure 7 This is a schematic diagram of an adjustable anti-door sagging device installed in an electrical cabinet and in the closed state, according to an embodiment of the present invention.

[0026] Figure 8 yes Figure 7 Enlarged structural diagram at point A.

[0027] The components include: support assembly 1, bottom frame 11, first through hole 111, press-fit nut 1111, first support plate 112, second through hole 1121, frame 113, folded edge 1131, adjusting plate 12, adjusting elongated hole 121, second support plate 122, third through hole 1221, support block 13, buffer slope 131, fastener 14, support member 15, nut 16, roller assembly 2, roller bracket 21, upper connector 211, first connecting plate 2111, right connector 212, second connecting plate 2121, left connector 213, rotating shaft 22, roller 23, cavity 24, electrical cabinet 3, cabinet door 31, cabinet body 32, fixed bracket 321, fixed horizontal bar 3211, and fixed vertical bar 3212. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these 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.

[0029] In the description of this utility model, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" and "second" may explicitly or implicitly include one or more of these features, used to distinguish descriptive features, without any order or emphasis.

[0030] like Figures 1 to 8 As shown, to solve the above-mentioned technical problems, this utility model proposes an adjustable door sagging prevention device, including a support assembly 1 and a roller assembly 2. The support assembly 1 includes a base frame 11, an adjusting plate 12, a support block 13, and a fastener 14. The base frame 11 is provided with a first through hole 111. The adjusting plate 12 is detachably connected to the base frame 11. The adjusting plate 12 is provided with an adjusting elongated hole 121 arranged in the vertical direction. The adjusting elongated hole 121 corresponds to the first through hole 111. During installation, the fastener 14 passes through the adjusting elongated hole 121 and the first through hole 111 in sequence to clamp and fix the adjusting plate 12 to the base frame 11. The support block 13 is fixedly connected to the adjusting plate 12. The roller assembly 2 includes a roller bracket 21, a rotating shaft 22, and a roller 23. The roller 23 is rotatably connected to the roller bracket 21 through the rotating shaft 22. In the closed state, the lower side of the support block 13 abuts against the upper side of the roller 23.

[0031] In practical applications, the support component 1 is installed on the cabinet door 31, and the roller component 2 is installed on the cabinet body 32 corresponding to the cabinet door 31. By setting a base frame 11 and an adjustment plate 12, and by providing an adjustment elongated hole 121 through the adjustment plate 12 in the vertical direction, the installation height of the adjustment plate 12 can be flexibly adjusted up and down within the longitudinal length range of the adjustment elongated hole 121. This causes the installation height of the support block 13, which is fixedly connected to the adjustment plate 12, to be adjusted accordingly. Ultimately, the installation height of the support block 13 matches the installation height of the roller 23, thereby preventing obstruction when closing the door. In the closed state, the lower side of the support block 13 abuts against the upper side of the roller 23, and the support block 13 presses against the roller 23. The roller 23 then transfers the weight of the cabinet door 31 to the cabinet body 32, thus reducing the weight of the cabinet door 31 borne by the door hinge and effectively preventing the door from sagging. This solves the technical problem that the installation height of the support block of the existing anti-door sagging device is difficult to adjust after welding, which leads to the device being ineffective and obstructing the closing of the door. This improves the flexibility and practicality of the device installation.

[0032] Specifically, when installing the adjustable anti-sag device, first install the roller assembly 2 on the cabinet 32, and then install the support assembly 1 on the cabinet door 31 corresponding to the cabinet 32. Specifically, when installing the support assembly 1, first weld the bottom frame 11 to the preset position on the cabinet door 31, and weld the support block 13 to the adjusting plate 12. Then, install and fix the adjusting plate 12 on the bottom frame 11 (in this operation, first align the adjusting elongated hole 121 with the first through hole 111, then use fasteners 14 to pass through the adjusting elongated hole 121 and the first through hole 111, and then tighten the fasteners 14 to clamp and fix the adjusting plate 12 on the bottom frame 11). Next, perform a door-closing test to observe whether the installation height of the support block 13 matches the installation height of the roller 23 (that is, whether the installation position of the support block 13 is too high or too low relative to the installation position of the roller 23). If the installation position of the support block 13 is too high, causing the support block 13 to separate from the roller 23 when the door is closed, or if the installation position of the support block 13 is too low, causing the support block 13 to collide with the roller 23 when the door is closed and thus obstructing the closing, then it is necessary to loosen the fastener 14 between the adjusting plate 12 and the bottom frame 11, and readjust the installation height of the adjusting plate 12 along the adjusting elongated hole 121 (in this operation, if the installation position of the support block 13 is too high, lower the installation height of the adjusting plate 12; if the installation position of the support block 13 is too low, raise the installation height of the adjusting plate 12). Then tighten the fastener 14 to clamp and fix the adjusting plate 12 to the bottom frame 11, and perform the closing test again until the installation height of the support block 13 matches the installation height of the roller 23 (that is, the door will not be obstructed when closing, and the lower side of the support block 13 can abut against the upper side of the roller 23 when the door is closed). The test is then complete.

[0033] Preferably, there are four first through holes 111 and four adjusting elongated holes 121, and the four adjusting elongated holes 121 correspond to the four corners of the adjusting plate 12, thereby making the connection between the adjusting plate 12 and the bottom frame 11 more stable.

[0034] like Figure 2 and Figure 3 As shown, to further illustrate, the lower end of the bottom frame 11 is provided with a first support plate 112 that folds backward, and the lower end of the adjustment plate 12 is provided with a second support plate 122 that folds backward. A support member 15 is provided between the first support plate 112 and the second support plate 122. The lower part of the support member 15 is fixedly connected to the first support plate 112, and the upper part of the support member 15 is fixedly connected to the second support plate 122.

[0035] By providing a support member 15 between the first support plate 112 and the second support plate 122, longitudinal support can be provided between the bottom frame 11 and the adjusting plate 12, enhancing the stability of the connection between the bottom frame 11 and the adjusting plate 12. This prevents the fasteners 14 between the bottom frame 11 and the adjusting plate 12 from loosening under the long-term pressure of the cabinet door 31's weight, thus preventing the entire device from failing to prevent the door from sagging. This improves the durability of the device, and it has high overall strength and a wide range of applications, especially suitable for larger cabinet doors 31.

[0036] Specifically, after the installation height of the support block 13 is adjusted, the lower part of the support member 15 is then connected to the first support plate 112, and the upper part of the support member 15 is connected to the second support plate 122.

[0037] Preferably, there are two support members 15, which are respectively located on the left and right sides between the first support plate 112 and the second support plate 122, thereby further enhancing the longitudinal support between the bottom frame 11 and the adjustment plate 12 and making the connection between the bottom frame 11 and the adjustment plate 12 more stable.

[0038] like Figure 2 and Figure 3 As shown, to further illustrate, the first support plate 112 is provided with a second through hole 1121, the second support plate 122 is provided with a third through hole 1221, the support member 15 is a bolt, and the support member 15 is fastened to the nut 16 after passing through the second through hole 1121 and the third through hole 1221.

[0039] By setting the support member 15 between the first support plate 112 and the second support plate 122 as a bolt, and the support member 15 passing through the second through hole 1121 and the third through hole 1221 and being fastened to the nut 16, the installation operation can be made more convenient, and the support member 15 can be adjusted or disassembled for easy maintenance or replacement in the future.

[0040] It should be noted that, in one embodiment of the present invention, the support member 15 passes through the second through hole 1121 and then through the third through hole 1221 before being fastened to the nut 16; in another embodiment of the present invention, the support member 15 passes through the third through hole 1221 and then through the second through hole 1121 before being fastened to the nut 16.

[0041] like Figures 2 to 4 As shown, to further illustrate, the side of the bottom frame 11 is connected to a forward-folding frame 113, and the bottom frame 11 is provided with a press-fit nut 1111 at the front end corresponding to the first through hole 111. The fastener 14 is a bolt, which passes through the adjustment elongated hole 121 and is then fastened to the press-fit nut 1111.

[0042] To allow the rivet nut 1111 to be installed in the first through hole 111, a forward-folding frame 113 needs to be connected to the side of the bottom frame 11, thus forming a receiving cavity that can accommodate the rivet nut 1111. Furthermore, by connecting the adjusting plate 12 to the bottom frame 11 with a fastener 14 (bolt), the connection and installation between the adjusting plate 12 and the bottom frame 11 becomes more convenient. During door-closing debugging, simply loosening the fastener 14 between the adjusting plate 12 and the bottom frame 11 allows for vertical adjustment of the adjusting plate 12's installation height within the longitudinal length range of the adjusting hole 121. This, in turn, adjusts the installation height of the support block 13 fixedly connected to the adjusting plate 12, improving the flexibility and convenience of the debugging operation.

[0043] like Figure 3 As shown, to further illustrate, the frame 113 is connected to an outwardly folded edge 1131, the surface of which is parallel to the surface of the bottom frame 11.

[0044] In order to securely install the bottom frame 11 onto the cabinet door 31, the bottom frame 11 is welded onto the cabinet door 31 by means of a folded edge 1131 during installation. Therefore, by connecting the outwardly folded edge 1131 to the frame 113, the welding area between the bottom frame 11 and the cabinet door 31 can be increased, thereby improving the welding strength of the bottom frame 11.

[0045] like Figure 3 and Figure 5 As shown, to further illustrate, the support block 13 has a V-shaped structure that is wider at the front and narrower at the back, and the rear of the support block 13 faces the roller bracket 21 when the door is closed.

[0046] The roller bracket 21 includes an upper connector 211, a right connector 212, and a left connector 213. The upper connector 211, right connector 212, and left connector 213 are respectively located on the upper side, right side, and left side of the roller bracket 21. The upper end of the right connector 212 is connected to the right end of the upper connector 211, and the lower end of the right connector 212 is connected to the right end of the rotating shaft 22. The upper end of the left connector 213 is connected to the left end of the upper connector 211, and the lower end of the left connector 213 is connected to the left end of the rotating shaft 22. The upper connector 211, right connector 212, and left connector 213 are connected to form a cavity 24 for the support block 13 to be inserted.

[0047] By designing the support block 13 into a V-shaped structure (wider at the front and narrower at the back) and the roller bracket 21 into a door frame shape with a cavity 24, the support block 13 can smoothly insert into the cavity 24 and abut against the roller 23 when the door is closed. This prevents the support block 13 from colliding with the roller bracket 21 and obstructing the closing process. Furthermore, by designing the roller bracket 21 into a door frame shape, the weight of the cabinet door 31 borne by the roller 23 can be evenly distributed to the roller bracket 21 through the left and right ends of the pivot 22 after the door is closed. This avoids stress concentration at a single point on the roller 23 or roller bracket 21, which could damage the entire roller assembly 2, further enhancing the structural stability and durability of the roller assembly 2.

[0048] Specifically, the upper connector 211, the right connector 212, and the left connector 213 are all plate-shaped structures. The maximum width of the left and right sides of the support block 13 is less than the distance between the right connector 212 and the left connector 213. The maximum height of the upper and lower sides of the support block 13 is less than the distance between the lower side of the upper connector 211 and the upper side of the roller 23.

[0049] like Figure 3 As shown, preferably, the lower end of the rear part of the support block 13 is inclined upward to form a buffer slope 131.

[0050] By providing an upwardly inclined buffer slope 131 at the lower rear end of the support block 13, the impact of the support block 13 on the roller 23 can be reduced when the door is closed, ensuring that the support block 13 can make smooth and stable contact with the roller 23, thereby improving the durability of the roller 23.

[0051] like Figure 6 As shown, this utility model also proposes an electrical cabinet 3, including a cabinet door 31, a cabinet body 32, and an adjustable anti-door sagging device as described in any one of the above. The support component 1 is installed on the cabinet door 31, and the roller component 2 is installed on the cabinet body 32.

[0052] By installing the adjustable anti-sag device in the electrical cabinet 3, the installation height of the support block 13 can be flexibly adjusted to match the installation height of the roller 23, so that the support assembly 1 and the roller assembly 2 can cooperate with each other to bear the weight of the cabinet door 31 onto the cabinet body 32, thereby reducing the weight of the door hinge and effectively preventing the cabinet door 31 from sagging, thus solving the technical problem of the cabinet door of the existing electrical cabinet being prone to sagging.

[0053] like Figures 5 to 8 As shown, to further illustrate, a first connecting plate 2111 is fixedly connected to the upper side of the roller bracket 21, and a fixed bracket 321 is provided on the cabinet 32. The fixed bracket 321 includes a fixed crossbar 3211, which is detachably connected to the first connecting plate 2111.

[0054] By setting the first connecting plate 2111 and the fixed crossbar 3211, it is easy to install and fix the roller bracket 21 onto the cabinet 32.

[0055] Specifically, both the first connecting plate 2111 and the fixed crossbar 3211 are provided with horizontally arranged mounting holes with the same spacing. When installing the roller bracket 21, first align the mounting holes of the first connecting plate 2111 with the mounting holes of the fixed crossbar 3211, and then use fasteners (such as screws or bolts) to pass through the mounting holes to fasten the first connecting plate 2111 and the fixed crossbar 3211, thereby fixing the roller bracket 21 to the cabinet 32.

[0056] like Figures 5 to 8 As shown, preferably, a second connecting plate 2121 is fixedly connected to the right side of the roller bracket 21, and the fixed bracket 321 also includes a fixed vertical rod 3212, which is detachably connected to the right end of the second connecting plate 2121.

[0057] By setting the second connecting plate 2121 and the fixed vertical rod 3212, the stability of the connection between the roller bracket 21 and the cabinet 32 ​​can be further enhanced.

[0058] Specifically, both the second connecting plate 2121 and the fixed vertical rod 3212 are provided with longitudinally arranged mounting holes with the same spacing. During installation, the mounting holes of the second connecting plate 2121 are aligned with the mounting holes of the fixed vertical rod 3212, and then fasteners (such as screws or bolts) are passed through the mounting holes to secure the second connecting plate 2121 and the fixed vertical rod 3212, which further enhances the stability of the connection between the roller bracket 21 and the cabinet 32.

[0059] In addition, during the installation process, the lateral installation position of the roller 23 can be flexibly adjusted by welding a second connecting plate 2121 of different lengths to the right side of the roller bracket 21, so that the lateral installation position of the roller 23 matches the lateral installation position of the support block 13, thereby further improving the flexibility of installation.

[0060] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. An adjustable anti-sag device for doors, characterized in that, It includes a support assembly and a roller assembly. The support assembly includes a base frame, an adjusting plate, a support block, and fasteners. The base frame is provided with a first through hole. The adjustment plate is detachably connected to the bottom frame. The adjustment plate has an adjustment elongated hole arranged in the vertical direction. The adjustment elongated hole corresponds to the first through hole. During installation, the fastener passes through the adjustment elongated hole and the first through hole in sequence to clamp and fix the adjustment plate to the bottom frame. The support block is fixedly connected to the adjustment plate; The roller assembly includes a roller bracket, a rotating shaft, and a roller. The roller is rotatably connected to the roller bracket via the rotating shaft. In the closed state, the lower side of the support block abuts against the upper side of the roller.

2. The adjustable anti-sag door device according to claim 1, characterized in that, The lower end of the base frame is provided with a first support plate that folds backward, and the lower end of the adjustment plate is provided with a second support plate that folds backward. A support member is provided between the first support plate and the second support plate. The lower part of the support member is fixedly connected to the first support plate, and the upper part of the support member is fixedly connected to the second support plate.

3. The adjustable anti-sag device for doors according to claim 2, characterized in that, The first support plate is provided with a second through hole, the second support plate is provided with a third through hole, the support member is a bolt, and the support member passes through the second through hole and the third through hole and is fastened to the nut.

4. The adjustable anti-sag device for doors according to claim 1, characterized in that, The bottom frame is connected to a forward-folding frame on its side. A rivet nut is provided on the front end of the bottom frame corresponding to the first through hole. The fastener is a bolt. The fastener passes through the adjustment elongated hole and is fastened to the rivet nut.

5. The adjustable anti-sag device for doors according to claim 4, characterized in that, The frame is connected to an outwardly folded edge, the surface of which is parallel to the surface of the bottom frame.

6. The adjustable anti-sag door device according to claim 1, characterized in that, The support block has a V-shaped structure that is wider at the front and narrower at the back, and the rear of the support block faces the roller bracket when the door is closed. The roller bracket includes an upper connector, a right connector, and a left connector. The upper connector, the right connector, and the left connector are respectively located on the upper side, the right side, and the left side of the roller bracket. The upper end of the right connector is connected to the right end of the upper connector, and the lower end of the right connector is connected to the right end of the rotating shaft. The upper end of the left connector is connected to the left end of the upper connector, and the lower end of the left connector is connected to the left end of the rotating shaft. The upper connector, the right connector, and the left connector are connected to form a cavity for the support block to be inserted.

7. The adjustable anti-sag door device according to claim 6, characterized in that, The lower rear end of the support block slopes upward to form a buffer slope.

8. An electrical cabinet, comprising a cabinet door and a cabinet body, characterized in that, It also includes an adjustable anti-sag device as described in any one of claims 1 to 7, wherein the support assembly is mounted on the cabinet door and the roller assembly is mounted on the cabinet body.

9. The electrical cabinet according to claim 8, characterized in that, A first connecting plate is fixedly connected to the upper side of the roller bracket, and the cabinet is provided with a fixed bracket, which includes a fixed crossbar and is detachably connected to the first connecting plate.

10. The electrical cabinet according to claim 9, characterized in that, A second connecting plate is fixedly connected to the right side of the roller bracket. The fixed bracket also includes a fixed vertical rod, which is detachably connected to the right end of the second connecting plate.

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