A kind of overhauls power box

Abstract

This invention discloses a maintenance power box, comprising an outer shell, terminals, a cover plate, and an adjustment switch, and further including: an external power-off structure, wherein an air switch is installed inside the outer shell and is turned on and off by a handle; an opening is provided at one end of the outer shell; the external power-off structure includes a mounting base embedded in the opening; a swing cylinder is provided on the inner side of the mounting base; a movable clamp is provided on the side of the swing cylinder near the outer shell and is clamped to the outside of the handle; and a linkage rod is provided on the side of the swing cylinder away from the outer shell; and an internal expansion structure, wherein a plurality of wire grooves are provided on the inner sidewall of the outer shell, the wire grooves being spaced apart; the internal expansion structure includes a stacking frame disposed in the intervals between the wire grooves; an elastic element is provided in the stacking frame; a locking plate is connected to the elastic element; and an electrical component is locked onto the locking plate. This invention can improve the strength of the entire box without increasing the thickness of the shell, and also provides higher safety.

Description

Technical Field

[0001] This invention relates to an electrical device, and more particularly to a maintenance power box. Background Technology

[0002] The maintenance power box, which is equipped with a main power switch, branch power switches, air switches, terminals, and small circuit breakers, is an intermediate maintenance device that connects an external power source to the electrical components to be maintained. It has a simple structure, low cost, and high safety, and can meet various power needs at power maintenance sites. It is widely used in various electrical systems.

[0003] Power boxes for maintenance are mostly used for on-site repairs, where workers operate them. However, operating power boxes for maintenance poses a risk of electric shock. Furthermore, the overall enclosure is too thin, the equipment is cramped, and there are many exposed live parts, making operation difficult. Some existing power boxes have their outer shells made into explosion-proof shells to increase the overall strength of the enclosure. However, increasing the wall thickness within the same volume directly reduces the installation space for internal electrical components. On the other hand, increasing the volume directly increases the overall size of the power box, affecting its portability. Moreover, thicker metal does not improve the overall safety; electric shock can still occur in the event of a leak.

[0004] Therefore, this case aims to provide a maintenance power box that can cut off the power with one button when the worker is about to retrieve the maintenance power box, and improve the strength of the entire box without increasing the thickness of the shell, and allow enough space inside the box to lay cables, thereby greatly improving the safety of the maintenance power box. Summary of the Invention

[0005] This invention provides a method for overhauling power boxes, which can effectively solve the above-mentioned problems.

[0006] This invention is implemented as follows:

[0007] A maintenance power box includes an outer casing for installing electrical components. The top surface of the casing is open, and several terminals are provided on the sides of the casing. A cover plate is provided on the top surface of the casing, and the side of the cover plate is hinged to the casing via a hinge. The cover plate has a handle and several adjustment switches. The maintenance power box further includes:

[0008] An external power-off structure is provided, wherein an air switch is installed inside the outer casing, and the air switch is turned on and off by a handle. One end of the outer casing has an opening, and the external power-off structure includes a mounting base embedded in the opening. A swing cylinder is provided on the inner side of the mounting base, and a movable clamp is provided on the side of the swing cylinder near the outer casing. The movable clamp is clamped on the outside of the handle, and a linkage rod is provided on the side of the swing cylinder away from the outer casing. When the maintenance power box needs to be de-energized, the linkage rod is rotated, causing the linkage rod to swing the swing cylinder, which in turn causes the movable clamp to rotate the handle, thus de-energizing the air switch.

[0009] The inner expansion structure includes a plurality of wire grooves on the inner sidewall of the outer casing. The wire grooves are spaced apart. The inner expansion structure includes a stacking frame disposed in the space between the wire grooves. An elastic element is disposed in the stacking frame. A locking plate is connected to the elastic element. An electrical component is locked onto the locking plate. After the wires are laid in the wire grooves, the side of the locking plate without the electrical component is compressed to the elastic element and locked to the stacking frame.

[0010] As a further improvement, the mounting base includes a connecting ring embedded in the opening position. An inner guide cylinder is connected to the side of the connecting ring near the outer shell, and an outer guide cylinder is connected to the side of the connecting ring away from the outer shell. The length of the outer guide cylinder is less than that of the inner guide cylinder, and the swing cylinder passes through the outer guide cylinder, the connecting ring, and the inner guide cylinder.

[0011] As a further improvement, the inner guide cylinder is located within the projection range of the outer edge of the cover plate.

[0012] As a further improvement, a number of guide ribs are fixed on the inner side of the connecting ring, and a protruding rib is formed on the inner side of the guide rib. A number of rib grooves are provided on the outer side of the swing cylinder, and a groove is formed in the middle section of the rib groove, so that the swing cylinder can rotate along the connecting ring and slide back and forth along the connecting ring at the same time.

[0013] As a further improvement, the movable clamp includes a connecting arm axially connected to the swing cylinder, a U-shaped clamping handle is connected to the connecting arm, the opening of the U-shaped clamping handle is adapted to the handle of the air switch, and a soft pad is provided on the inner side of the U-shaped clamping handle.

[0014] As a further improvement, heat-permeable holes are provided on both sides of the soft pad, on the side facing the handle.

[0015] As a further improvement, the stacking frame includes several stacked pieces arranged in the spacing of the wire slots, the height of the stacked pieces being higher than the wire slots, and both sides of all the stacked pieces being locked and fixed by a series connecting plate.

[0016] As a further improvement, the elastic element includes a plurality of spring seats disposed on the outer side of the stack, wherein a plurality of springs higher than the stack are disposed on the spring seats, and the top end of the springs is connected to the locking plate.

[0017] As a further improvement, the locking plate includes a support plate for mounting components. The back of the support plate is provided with guide ribs corresponding to the number of laminations. The support plate has several threaded holes through which the support plate is locked to the laminations and the connecting plate. The support plate also has several through slots for making way for cables in the wire slots.

[0018] The beneficial effects of this invention are:

[0019] Existing maintenance power boxes typically have very thin outer shells for convenience and mobility, sacrificing shell strength. Therefore, many explosion-proof maintenance power boxes have emerged on the market. Most of these use thicker explosion-proof shells to increase strength, but this thickness directly reduces the internal space for wiring. Therefore, this invention, through an added internal expansion structure, allows for the installation of locking plates on the wire troughs after conventional wiring. First, the connection between the locking plate and the stacking frame is released, allowing the locking plate to hang naturally via an elastic element. Wiring is then performed in the wire troughs. After wiring is complete, the locking plate is locked onto the stacking frame, allowing for further wiring or installation of electrical components on the locking plate, achieving a double-layer wiring effect. This improves space utilization. Simultaneously, the raised stacking frame directly increases the side wall strength of the outer shell, thereby enhancing the overall strength of the maintenance power box. This achieves the desired protective effect without occupying the entire box's usable space or requiring additional thickness.

[0020] When the stacking rack is installed, if it is placed inside the wire trough, it will directly obstruct the cable arrangement and occupy the original space of the cable. Therefore, the present invention sets the stacking pieces of the stacking rack in the interval between the wire troughs, avoiding the wire troughs, and makes the height of the stacking pieces higher than the wire troughs. This way, the setting of the stacking pieces does not affect the cable arrangement in the wire troughs, thereby achieving the effect of having installation space on both planes, and thus improving the space utilization rate inside the maintenance power box.

[0021] During the wiring process of the wire trough, it needs to connect with the electrical components arranged on the locking plate. Therefore, if the locking plate is separate from the whole structure, someone needs to assist in the installation. Thus, this invention adds an elastic element to the stacking frame and locking plate. Through the design of the spring seat and spring, the locking plate can be connected, avoiding its direct separation without connection. In addition, the spring connection can also play a certain temporary linking role when the connection nodes of the locking plate and the stacking frame separate, thereby improving the practical effect of this invention.

[0022] During installation, since there are multiple stacked plates, in order to improve the cooperation between the locking plate and the stacked plates, guide ribs corresponding to the number of stacked plates are set on the back of the locking plate to hold the stacked plates in place. Then, the support plate is locked to the stacked plates and the connecting plate, thereby overcoming the repulsive force of the spring on the support plate and balancing the entire internal expansion structure.

[0023] Although the strength was not reduced after the outer shell was made thinner, the overall leakage problem could not be solved. Once leakage occurred, the outer shell would also become electrified, making it unsafe for personnel to operate during maintenance. Therefore, this invention, through the setting of an external power-off structure, allows the power to be turned off after maintenance without opening the cover. Simply rotate the linkage rod to make the swing cylinder rotate, which in turn makes the movable clamp rotate, which in turn makes the handle rotate, directly turning off the air switch and cutting off the power. At this time, the staff can then open the cover and disconnect the corresponding terminals, thus safely disconnecting the maintenance power box from the power cabinet or electrical equipment.

[0024] In order to avoid electric shock, the external power-off structure needs to be mechanical and insulated. This way, when the staff needs to cut off the power with one button, they do not need to touch the outer shell and cover plate. Therefore, the mounting base of this invention is divided into inner and outer connecting parts. Through the guidance of the outer guide cylinder, connecting ring and inner guide cylinder, the swing cylinder is guided, so that the swing cylinder can be kept within a fixed range whether it is rotating or retracting or expanding.

[0025] In the process of cooperating with the swing cylinder, the connecting ring needs to achieve not only forward and backward movement, but also circumferential rotation. Therefore, the present invention sets guide ribs and convex ribs on the connecting ring, and sets rib grooves and recesses in the swing cylinder to cooperate with the guide ribs and convex ribs, thereby realizing the rotation of the rib grooves and guide ribs and the lateral movement of the convex ribs and recesses, realizing positional changes in two dimensions, so as to achieve the effect of opening and closing the air switch, and also to retract into the outer edge of the cover plate, facilitating the transportation of the entire box.

[0026] To better coordinate the movable clamp with the handle, the end of the movable clamp in this embodiment is provided with a U-shaped clamping handle that matches the shape of the handle. The U-shaped clamping handle itself is made of plastic, which can provide insulation, and the soft pad inside the U-shaped clamping handle is made of rubber, which can also provide insulation. Even if there is a leakage, it will not be conducted to the linkage rod. Furthermore, the rotation angle of the U-shaped clamping handle is consistent with the rotation angle of the handle, so that the handle will only rotate when the U-shaped clamping handle rotates. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0029] Figure 2 This is a top view of the structure of the present invention.

[0030] Figure 3 This is the present invention. Figure 3 Cross-sectional view at point AA.

[0031] Figure 4 This is a schematic diagram of the structure of the present invention after the cover plate has been removed (electrical components have not yet been assembled).

[0032] Figure 5 This is a schematic diagram of the mounting base of the present invention.

[0033] Figure 6 This is a schematic diagram of the external power-off structure of the present invention.

[0034] Figure 7 This is a schematic diagram of the internal extension structure of the present invention.

[0035] Figure 8 This is a schematic diagram of the internal expansion structure of the present invention (with the locking plate removed).

[0036] In the picture:

[0037] 10. Outer shell, 11. Wire groove, 20. Terminal block, 30. Adjustment switch, 40. External power-off structure, 50. Mounting base, 51. Connecting ring, 511. Guide rib, 5111. Protruding rib, 5112. Inner guide cylinder, 512. Outer guide cylinder, 513. Swing cylinder, 52. Rib groove, 522. Movable clamp, 53. Connecting arm, 532. U-shaped clamping handle, 533. Soft pad, 533. Linkage rod, 54. Inner expansion structure, 60. Stacking frame, 61. Stacking plate, 612. Series plate, 62. Elastic element, 621. Spring seat, 622. Locking plate, 63. Support plate, 631. Guide rib, 632. Detailed Implementation

[0038] All embodiments of the present invention are intended to fall within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0039] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating that the purpose, technical solution, and advantages of the method are clearer. The technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort indicate or imply the relative importance of the indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] Reference Figures 1 to 8As shown, a maintenance power box includes an outer casing 10 for installing electrical components. The top surface of the outer casing 10 is open, and several terminals 20 are provided on the side of the outer casing 10. A cover plate 30 is provided on the top surface of the outer casing 10, and the side of the cover plate 30 is hinged to the outer casing 10 by a hinge. The cover plate 30 is provided with a handle and several adjustment switches 40. The maintenance power box also includes an external power-off structure 50. An air switch is provided inside the outer casing 10, and the air switch is turned on and off by a handle. One end of the outer casing 10 has an opening, and the external power-off structure 50 includes a mounting base 51 embedded in the opening. A swing cylinder 52 is provided on the inner side of the mounting base 51, and a movable clamp 53 is provided on the side of the swing cylinder 52 near the outer casing 10. The movable clamp 53 is clamped on the outside of the handle. A linkage rod 54 is provided on the side of the swing cylinder 52 away from the outer shell 10. When the maintenance power box needs to be de-energized, the linkage rod 54 is rotated, causing the swing cylinder 52 to swing, which in turn causes the movable clamp 53 to rotate the handle, thus de-energizing the air switch. The inner expansion structure 60 includes several wire grooves 11 on the inner side wall of the outer shell 10. The wire grooves 11 are spaced apart. The inner expansion structure 60 includes a stacking frame 61 arranged in the space between the wire grooves 11. An elastic element 62 is provided in the stacking frame 61. A locking plate 63 is connected to the elastic element 62. An electrical component is locked onto the locking plate 63. After the wires are laid in the wire grooves 11, the side of the locking plate 63 without the electrical component is compressed to the elastic element 62 and locked to the stacking frame 61.

[0041] In this embodiment, it is necessary to install the required air switches, circuit breakers, cables and other structures in the maintenance power box. Therefore, in the early wiring stage, it is necessary to consider the possible leakage problems that may occur later.

[0042] Existing maintenance power boxes typically have very thin outer shells for convenience and mobility, sacrificing shell strength. Therefore, many explosion-proof maintenance power boxes have emerged on the market. Most of these explosion-proof power boxes use thicker explosion-proof shells to increase strength, but this thicker shell directly reduces the internal layout space. Therefore, this invention, through the addition of an internal expansion structure 60, allows for the installation of a locking plate 63 on the wire trough 11 after the conventional wiring. First, the tight connection between the locking plate 63 and the stacking frame 61 is released. The locking plate 63 is allowed to hang naturally through the elastic element 62. Wiring is first carried out in the wire channel 11. After the wire channel 11 is completed, the locking plate 63 is locked onto the stacking frame 61. This allows for wiring or installation of electrical components on the locking plate 63, thus achieving the effect of double-layer wiring. This makes better use of the space. At the same time, the raised stacking frame 61 can directly increase the strength of the side wall of the outer shell 10, thereby improving the strength of the entire maintenance power box. It does not require occupying the entire box's usable space and can achieve the corresponding protective effect without increasing the thickness.

[0043] If the stacking rack 61 is placed inside the wire trough 11, it will directly obstruct the cable arrangement and occupy the original space of the cable. Therefore, the stacking rack 61 in this embodiment includes several stacked pieces 611 arranged in the intervals of the wire trough 11. The height of the stacked pieces 611 is higher than the wire trough 11. Both sides of all the stacked pieces 611 are locked and fixed by a connecting plate 612. By placing the stacked pieces 611 of the stacking rack 61 in the intervals between the wire troughs 11, avoiding the wire trough 11, and making the height of the stacked pieces 611 higher than the wire trough 11, the arrangement of the stacked pieces 611 does not affect the cable arrangement in the wire trough 11, thereby achieving the effect of having installation space on both planes, and thus improving the space utilization rate inside the maintenance power box.

[0044] During the wiring process of the wire trough 11, it needs to connect with the electrical components arranged on the locking plate 63. Therefore, if the locking plate 63 is separate from the whole structure, someone needs to assist in the installation. Thus, the elastic element 62 in this embodiment includes several spring seats 621 arranged on the outer side of the stack 611. Several springs 622 higher than the stack 611 are arranged on the spring seats 621. The top of the springs 622 is connected to the locking plate 63. The elastic element 62 is set on the basis of the stack frame 61 and the locking plate 63. Through the design of the spring seats 621 and the springs 622, the locking plate 63 can be connected, avoiding its direct separation without connection. In addition, the connection of the springs 622 can also play a certain temporary connection role when the connection nodes of the locking plate 63 and the stack frame 61 are separated, thereby improving the practical effect of the present invention.

[0045] During installation, since there are multiple stacked pieces 611, the locking plate 63 includes a support plate 631 for mounting components to improve the fit between the locking plate 63 and the stacked pieces 611. The back of the support plate 631 is provided with guide ribs 632 corresponding to the number of stacked pieces 611. The support plate 631 has several threaded holes, which are used to lock the support plate 631 onto the stacked pieces 611 and the connecting plate 612. The support plate 631 also has several through slots, which are used to make way for the cables in the wire groove 11. Thus, the guide ribs 632 on the back of the locking plate 63, corresponding to the number of stacked pieces 611, hold the stacked pieces 611 in place, and then the support plate 631 is locked onto the stacked pieces 611 and the connecting plate 612. This can overcome the repulsive force of the spring 622 on the support plate 631 and balance the entire inner expansion structure 60.

[0046] Although the strength is not reduced after the outer shell is made thinner, the overall leakage problem still cannot be solved. Once leakage occurs, the outer shell will also become electrified, which is unsafe for personnel to operate during the maintenance phase. Therefore, the present invention has an external power-off structure 50. When the power needs to be turned off after maintenance, there is no need to open the cover 30. Simply rotate the linkage rod 54 to make the swing cylinder 52 rotate, which in turn makes the swing cylinder 52 rotate the movable clamp 53, which in turn makes the handle rotate, so that the air switch is directly turned off and the power is cut off. At this time, the staff can then open the cover 30 and disconnect the corresponding terminal 20, thereby safely disconnecting the maintenance power box from the power cabinet or electrical equipment.

[0047] In setting up an external power-off structure 50, to avoid electric shock, it needs to be a mechanical and insulated structure so that when the operator needs to cut off the power with one button, they do not need to touch the outer shell 10 and the cover plate 30. Therefore, the mounting base 51 in this embodiment includes a connecting ring 511 embedded in the opening position. The side of the connecting ring 511 near the outer shell 10 is connected to an inner guide cylinder 512, and the side of the connecting ring 511 away from the outer shell 10 is connected to an outer guide cylinder 513. The length of the outer guide cylinder 513 is less than that of the inner guide cylinder 512. The swing cylinder 52 passes through the outer guide cylinder 513, the connecting ring 511, and the inner guide cylinder 512. The mounting base 51 is divided into inner and outer connecting parts. Through the guidance of the outer guide cylinder 513, the connecting ring 511, and the inner guide cylinder 512, the swing cylinder 52 is guided, so that the swing cylinder 52 can be kept within a fixed range whether it is rotating or retracting or expanding.

[0048] In order to avoid expanding the lateral area of ​​the entire box after setting the inner guide cylinder 512, the inner guide cylinder 512 is located within the projection range of the outer edge of the cover plate 30, and the swing cylinder 52 is also located within the projection range of the outer edge of the cover plate 30 after retracting into the inner guide cylinder 512.

[0049] During the engagement of the connecting ring 511 with the swing cylinder 52, it needs to achieve not only forward and backward movement but also circumferential rotation. Therefore, in this embodiment, the inner side of the connecting ring 511 is fixed with several guide ribs 5111, and the inner side of each guide rib 5111 has a protruding rib 5112. The outer side of the swing cylinder 52 is provided with several rib grooves 521, and the middle section of each rib groove 521 has a groove 522, so that the swing cylinder 52 can rotate along the connecting ring 511 while also moving along the connecting ring 511. 1. Sliding back and forth: By setting guide ribs 5111 and convex ribs 5112 on the connecting ring 511, and setting rib grooves 521 and grooves 522 in the swing cylinder 52 to cooperate with guide ribs 5111 and convex ribs 5112, the rib grooves 521 and guide ribs 5111 are rotated and the convex ribs 5112 and grooves 522 are moved laterally, realizing positional changes in two dimensions. This achieves the effect of opening and closing the air switch, and can also be retracted into the outer edge of the cover plate 30, facilitating the transportation of the entire box.

[0050] To better coordinate the movable clamp 53 with the handle, the movable clamp 53 in this embodiment includes a connecting arm axially connected to the swing cylinder 52. A U-shaped clamping handle 532 is connected to the connecting arm. The opening of the U-shaped clamping handle 532 is adapted to the handle of the air switch. A soft pad 533 is provided on the inner side of the U-shaped clamping handle 532. The end of the movable clamp 53 is provided with a U-shaped clamping handle 532 adapted to the shape of the handle. The U-shaped clamping handle 532 itself is made of plastic, which can provide insulation. The soft pad 533 inside the U-shaped clamping handle 532 is made of rubber, which can also provide insulation. Even if there is leakage, it will not be conducted to the linkage rod 54. Moreover, the rotation angle of the U-shaped clamping handle 532 is consistent with the rotation angle of the handle, so that the handle will only rotate when the U-shaped clamping handle 532 rotates.

[0051] The air switch generates heat during use. To prevent the soft pad 533 from affecting the heat dissipation of the handle after it is in contact with the handle, heat-permeable holes are provided on the side of the soft pad 533 facing the handle and on both sides of the soft pad 533. This allows for heat dissipation at the handle position, ensuring that the setting of the movable clip 53 does not affect the normal use of the air switch.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A maintenance power box, comprising an outer casing (10) for installing electrical components, wherein the top surface of the outer casing (10) is open, and a plurality of terminals (20) are provided on the side of the outer casing (10), a cover plate (30) is provided on the top surface of the outer casing (10), the side of the cover plate (30) is hinged to the outer casing (10) by a hinge, the cover plate (30) is provided with a handle, and a plurality of adjustment switches (40) are provided on the cover plate (30), characterized in that, The power box under maintenance also includes: An external power-off structure (50) is provided. An air switch is installed inside the outer shell (10). The air switch is turned on and off by a handle. An opening is opened at one end of the outer shell (10). The external power-off structure (50) includes a mounting base (51) embedded in the opening. A swing cylinder (52) is provided on the inner side of the mounting base (51). A movable clamp (53) is provided on the side of the swing cylinder (52) close to the outer shell (10). The movable clamp (53) is clamped on the outside of the handle. A linkage rod (54) is provided on the side of the swing cylinder (52) away from the outer shell (10). When the maintenance power box needs to be de-energized, the linkage rod (54) is rotated, causing the linkage rod (54) to drive the swing cylinder (52) to swing, causing the movable clamp (53) to drive the handle to rotate, thereby de-energizing the air switch. The inner expansion structure (60) includes a plurality of wire grooves (11) on the inner sidewall of the outer shell (10). The wire grooves (11) are spaced apart. The inner expansion structure (60) includes a stacking frame (61) arranged in the space between the wire grooves (11). An elastic element (62) is provided in the stacking frame (61). A locking plate (63) is connected to the elastic element (62). An electrical component is locked on the locking plate (63). After the wires are laid in the wire groove (11), the side of the locking plate (63) without the electrical component is compressed to the elastic element (62) and locked to the stacking frame (61).

2. The power box for maintenance according to claim 1, characterized in that, The mounting base (51) includes a connecting ring (511) embedded in the opening position. The side of the connecting ring (511) close to the outer shell (10) is connected to an inner guide cylinder (512), and the side of the connecting ring (511) away from the outer shell (10) is connected to an outer guide cylinder (513). The length of the outer guide cylinder (513) is less than that of the inner guide cylinder (512). The swing cylinder (52) passes through the outer guide cylinder (513), the connecting ring (511), and the inner guide cylinder (512).

3. The power box for maintenance according to claim 2, characterized in that, The inner guide cylinder (512) is located within the projection range of the outer edge of the cover plate (30).

4. The power box for maintenance according to claim 2, characterized in that, The inner side of the connecting ring (511) is fixed with several guide ribs (5111), and a rib (5112) is opened on the inner side of the guide ribs (5111). The outer side of the swing cylinder (52) is provided with several rib grooves (521), and a groove (522) is opened in the middle section of the rib grooves (521), so that the swing cylinder (52) can rotate along the connecting ring (511) and slide back and forth along the connecting ring (511) at the same time.

5. A power box for maintenance according to claim 1, characterized in that, The movable clamp (53) includes a connecting arm axially connected to the swing cylinder (52), and a U-shaped clamping handle (532) is connected to the connecting arm. The opening of the U-shaped clamping handle (532) is adapted to the handle of the air switch, and a soft pad (533) is provided on the inner side of the U-shaped clamping handle (532).

6. A power box for maintenance according to claim 5, characterized in that, The soft pad (533) has heat-permeable holes on the side facing the handle and on both sides of the soft pad (533).

7. A power box for maintenance according to claim 1, characterized in that, The stacking frame (61) includes a number of stacked pieces (611) arranged in the intervals of the wire groove (11). The height of the stacked pieces (611) is higher than that of the wire groove (11). Both sides of all the stacked pieces (611) are locked and fixed by a connecting plate (612).

8. A power box for maintenance according to claim 7, characterized in that, The elastic element (62) includes a plurality of spring seats (621) disposed on the outer side of the stack (611), and a plurality of springs (622) higher than the stack (611) are disposed on the spring seats (621), and the top end of the springs (622) is connected to the locking plate (63).

9. A power box for maintenance according to claim 7, characterized in that, The locking plate (63) includes a support plate (631) for mounting components. The back of the support plate (631) is provided with guide ribs (632) corresponding to the number of laminations (611). The support plate (631) has several threaded holes, through which the support plate (631) is locked onto the laminations (611) and the connecting plate (612). The support plate (631) also has several through slots, which are used to make way for the cables in the wire groove (11).

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