Low voltage switchgear for a power distribution center

Abstract

The application relates to the technical field of low-voltage switch cabinets, and discloses a low-voltage switch cabinet of a power distribution center, which comprises an outer box and a sealing door on the outer box, the top end of the outer box is additionally provided with a filter screen, a cleaning component is arranged on the inner wall of the outer box and close to the filter screen, the cleaning component is operatively abutted on the filter screen, a window penetrating through one side of the outer box is arranged on one side of the outer box, and a driving component is arranged on the other side of the outer box. The application utilizes a brush to rub a rotating shaft to clean dust on the rotating shaft, when a connecting frame moves, the connecting frame drives dust-free cloth to be unfolded, the dust-free cloth is used to receive the dust falling from the rotating shaft, after the dust-free cloth is completely unfolded, the dust-free cloth is completely same in size with the inner part of the outer box, the dust-free cloth can completely separate the electric appliance parts in the filter screen from the rotating shaft, so that foreign matters falling into the inner part of the low-voltage switch cabinet are reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of low-voltage switch cabinets, in particular to a low-voltage switch cabinet of a power distribution center. BACKGROUND

[0002] The switch cabinet is a kind of electrical equipment. External lines first enter the main control switch in the cabinet, and then enter the branch control switch. Each branch is set according to its needs. For example, instruments, automatic controls, motor magnetic switches, various AC contactors, etc. Some also have high-voltage and low-voltage switch cabinets, and have high-voltage buses, such as power plants. The components in the switch cabinet mainly include circuit breakers, disconnectors, load switches, operating mechanisms, transformers, and various protection devices. There are many classification methods for switch cabinets. For example, according to the installation method of the circuit breaker, the switch cabinet can be divided into removable switch cabinet and fixed switch cabinet. Or according to the different structures of the cabinet body, the switch cabinet can be divided into open switch cabinet, metal enclosed switch cabinet, and metal enclosed armored switch cabinet. According to the voltage level, the switch cabinet can be divided into high-voltage switch cabinet, medium-voltage switch cabinet and low-voltage switch cabinet, etc. It is mainly suitable for power plants, substations, petroleum and chemical industry, metallurgy and steel rolling, light industry and textile, factories, mines, enterprises and residential areas, high-rise buildings and other different occasions. The low-voltage switch cabinet is suitable for power plants, petroleum, chemical industry, metallurgy, textile, high-rise building and other industries, and is used for power transmission, power distribution and power conversion.

[0003] The existing low-voltage switch cabinet is used for a long time, and the filter screen is full of dust, which affects heat dissipation. Therefore, the filter screen needs to be cleaned and maintained. However, when the maintenance and cleaning are performed, the filter screen is installed at a high position and is not convenient for personnel to disassemble and clean. When the filter screen is disassembled, the dust on the filter screen may fall on the electrical parts inside the filter screen, which affects the normal use of the low-voltage switch cabinet. In addition, after the filter screen is pulled out, the upper end of the low-voltage switch cabinet is not protected by the filter screen, which may cause foreign matters to fall into the interior of the low-voltage switch cabinet. In summary, the existing low-voltage switch cabinet is not convenient for cleaning the filter screen, and the maintenance efficiency is low. SUMMARY

[0004] The application provides a low-voltage switch cabinet of a power distribution center, which has the beneficial effect of automatic cleaning, maintenance and repair.

[0005] The application provides the following technical scheme: a low-voltage switch cabinet of a power distribution center, comprising an outer box and a sealing door on the outer box, wherein the top end of the outer box is further provided with a filter screen, and the inner wall of the outer box is provided with a cleaning component near the filter screen, the cleaning component is operatively abutted on the filter screen, one side of the outer box is provided with a window penetrating through one side of the outer box, and the other side of the outer box is provided with a driving component, and the driving component is used to drive the cleaning component to slide.

[0006] The cleaning component is also equipped with a lint-free cloth at its lower end. One end of the lint-free cloth is installed on the inner wall of the outer casing and near the lower end of the window. The cleaning component includes a connecting frame that is slidably connected to the inner wall of the outer casing. Short shafts are rotatably connected to both sides of one end of the connecting frame. A semi-cylinder is connected between the two short shafts. Air holes are provided on the semi-cylinder. The air holes can operably spray gas to impact the outer surface of the lint-free cloth and the filter screen. A brush is installed at the upper end of the semi-cylinder. The brush is used to rub the lower end face of the filter screen.

[0007] As an optional solution for the low-voltage switchgear of the power distribution center described in this invention, wherein: the semi-cylinder and the brush form a cylindrical structure, and the axis of the cylinder is far from the axis of the short axis.

[0008] As an optional solution for the low-voltage switchgear of the power distribution center described in this invention, wherein: a gear ring is installed on the outer circle of one of the short shafts, and a rack is also installed on the inner wall of the outer casing, and the gear ring meshes with the rack.

[0009] As an optional solution for the low-voltage switchgear of the power distribution center described in this invention, a torque spring is also installed on the outer circle of the two short shafts. The torque spring is connected to the connecting frame. There are several racks, which are divided into several equal parts and arranged in an array along the movement direction of the connecting frame.

[0010] As an optional solution for the low-voltage switchgear of the power distribution center described in this invention, wherein: a connecting slider is slidably connected to the top of the inner wall of the outer box, the lower end of the connecting slider is slidably connected to one end of the connecting frame, and a fourth spring is installed on the connecting frame, the fourth spring being connected to the connecting slider;

[0011] The inner wall of the outer casing is also equipped with a protrusion near the connecting frame, and the connecting frame is operably abutted against one side of the protrusion.

[0012] As an optional solution for the low-voltage switchgear of the power distribution center described in this invention, a circular sleeve is installed at one end of the short shaft, a push rod is slidably connected inside the circular sleeve, a third spring is also installed on the inner wall of the circular sleeve, the third spring is connected to the push rod, and the push rod can operably strike the clean cloth.

[0013] As an optional solution for the low-voltage switchgear of the power distribution center of the present invention, the driving component includes a power box installed on one side of the outer casing, a rotating shaft is rotatably connected inside the power box, a steel cable and an extension block are sequentially installed on the outer circle of the rotating shaft, the steel cable passes through the outer casing and is connected to the connecting frame, and a limit plate is also installed at one end of the rotating shaft;

[0014] The outer circumference of the rotating shaft is also equipped with a gear, one end of the sealing door is equipped with a rack, the rack is operable through the power box and is used to drive the gear to rotate, and the inner wall of the outer box is also equipped with a first spring, which is connected to the connecting frame.

[0015] As an optional embodiment of the low-voltage switchgear of the power distribution center described in this invention, wherein: an air box is also installed at the lower end of the power box, a piston is slidably connected inside the air box, a cylinder is installed at the upper end of the piston, the cylinder penetrates the air box, the protruding block is used to squeeze the cylinder to slide downward, a second spring is also installed on the inner wall of the air box, the second spring is connected to the piston, a hose is also installed at one end of the connecting frame, the hose is used to supply air to the air hole, and one end of the hose penetrates the outer box and communicates with the inside of the air box.

[0016] As an optional solution for the low-voltage switchgear of the power distribution center described in this invention, wherein: the interior of the short shaft is provided with a first conveying groove communicating with an air hole, the outer circle of one end of the short shaft is provided with a plurality of first holes, the plurality of first holes are arranged in a circumferential array around the axis of the short shaft, and the interior of the connecting frame is provided with a second conveying groove communicating with a flexible hose, the second conveying groove being operably connected to the first holes.

[0017] As an optional solution for the low-voltage switchgear of the power distribution center described in this invention, wherein: both ends of the protrusion are provided with inclined surfaces, and the connecting frame is used to abut against the inclined surfaces.

[0018] The present invention has the following beneficial effects:

[0019] 1. The low-voltage switchgear in this power distribution center uses a brush to rub the rotating shaft to clean the dust on the rotating shaft. When the connecting frame moves, the connecting frame drives the dust-free cloth to unfold, using the dust-free cloth to catch the dust falling from the rotating shaft, thereby reducing the amount of dust on the filter screen falling onto the electrical parts inside the filter screen. When the dust-free cloth is fully unfolded, the size of the dust-free cloth is exactly the same as the size of the inner part of the outer casing. The dust-free cloth can completely separate the electrical parts inside the filter screen from the rotating shaft, thereby reducing the amount of foreign objects falling into the interior of the low-voltage switchgear.

[0020] 2. The low-voltage switchgear of this power distribution center uses air holes on a semi-cylinder to spray high-pressure air. This air impacts the dust on the outer surface of the cleanroom cloth and filter, causing the dust on the cleanroom cloth to flow out of the inner casing through the window. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 This is a side view of the entire invention.

[0023] Figure 3 This is a schematic diagram of the cleaning component of the present invention.

[0024] Figure 4 This is a schematic diagram of the structure of the connecting slider and the connecting frame of the present invention.

[0025] Figure 5 This is a cross-sectional view of the power box of the present invention.

[0026] Figure 6 This is a cross-sectional view of the connecting frame of the present invention.

[0027] In the diagram: 1. Outer casing; 2. Filter screen; 3. Cleaning component; 4. Dust-free cloth; 5. Window; 6. Sealing door; 7. Rack; 8. Power box; 9. First spring; 10. Steel cable; 11. Hose; 12. Rotating shaft; 13. Gear; 14. Extending block; 15. Air box; 16. Piston; 17. Cylinder; 18. Second spring; 19. Limiting plate; 31. Connecting frame; 32. Short shaft; 33. Semi-cylinder; 34. Brush; 35. Air hole; 36. Torque spring; 37. Gear ring; 38. Rack; 39. Protrusion; 40. Inclined surface; 41. Circular sleeve; 42. Third spring; 43. Push rod; 44. Connecting slider; 45. Fourth spring; 46. First hole; 47. First conveying groove; 48. Second conveying groove. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1

[0030] Please see Figures 1-3 A low-voltage switchgear for a power distribution center includes an outer enclosure 1 and a sealed door 6 on the outer enclosure 1. A filter screen 2 is installed on the top of the outer enclosure 1. A cleaning component 3 is installed on the inner wall of the outer enclosure 1 near the filter screen 2. The cleaning component 3 is operablely against the filter screen 2. A window 5 penetrating one side of the outer enclosure 1 is provided on one side. A driving component is installed on the other side of the outer enclosure 1. The driving component is used to drive the cleaning component 3 to slide.

[0031] The cleaning component 3 is also equipped with a lint-free cloth 4 at its lower end. One end of the lint-free cloth 4 is installed on the inner wall of the outer casing 1 and near the lower end of the window 5. The cleaning component 3 includes a connecting frame 31 that is slidably connected to the inner wall of the outer casing 1. Short shafts 32 are rotatably connected to both sides of one end of the connecting frame 31. A semi-cylinder 33 is connected between the two short shafts 32. An air hole 35 is provided on the semi-cylinder 33. The air hole 35 can operably spray gas to impact the outer surface of the lint-free cloth 4 and the filter screen 2. A brush 34 is installed at the upper end of the semi-cylinder 33. The brush 34 is used to rub the lower end surface of the filter screen 2.

[0032] After prolonged use, the filter screen 2 of the existing low-voltage switchgear will accumulate dust, which will affect heat dissipation. Therefore, the filter screen 2 needs to be cleaned and maintained. However, when cleaning and maintaining the filter screen 2, it is inconvenient for personnel to disassemble it due to its high installation position. Furthermore, when the filter screen 2 is removed, the upper part of the low-voltage switchgear will be without filtration protection, which may cause foreign objects to fall into the interior of the low-voltage switchgear. In summary, the existing low-voltage switchgear is inconvenient to clean the filter screen 2 and has low maintenance efficiency.

[0033] To solve the above problems, a brush 34 is installed inside the outer casing 1 of the device, according to... Figure 3 As shown, the connecting frame 31 and the brush 34 are driven to slide left and right by the driving component, and the brush 34 is used to rub the rotating shaft 12 to clean the dust on the rotating shaft 12. When the connecting frame 31 moves, the connecting frame 31 drives the dust-free cloth 4 to unfold. The dust-free cloth 4 is used to catch the dust falling from the rotating shaft 12, thereby reducing the dust on the filter screen 2 from falling onto the electrical parts inside the filter screen 2. After the dust-free cloth 4 is fully unfolded, the dust-free cloth 4 is exactly the same size as the inside of the outer box 1. The dust-free cloth 4 can completely separate the electrical parts inside the filter screen 2 from the rotating shaft 12, thereby reducing the amount of foreign objects falling into the interior of the low-voltage switch cabinet.

[0034] Air blowing dust removal: According to Figure 3 As shown, by setting air holes 35 on the semi-cylinder 33, high-pressure air is sprayed through the air holes 35. The air impacts the dust on the outer surface of the cleanroom cloth 4 and the filter screen 2, so that the dust on the cleanroom cloth 4 flows out of the interior of the outer box 1 through the window 5.

[0035] It should be noted that when the cleanroom cloth 4 is fully unfolded, the horizontal plane of the cleanroom cloth 4 forms an angle with the horizontal plane of the outer box 1, so that the dust falling on the cleanroom cloth 4 will flow from the cleanroom cloth 4 at the lower end of the connecting frame 31 to the window 5.

[0036] Example 2

[0037] This embodiment is an improvement upon embodiment 1. For details, please refer to [link / reference]. Figures 1-3 The semi-cylinder 33 and the brush 34 form a cylindrical structure, with the axis of the cylinder being far from the axis of the short axis 32.

[0038] One of the short shafts 32 has a gear ring 37 installed on its outer circle, and a rack 38 is installed on the inner wall of the outer box 1. The gear ring 37 and the rack 38 mesh with each other.

[0039] Spinning strike: according to Figure 3 As shown, when the connecting frame 31 and the short shaft 32 slide to one side, the gear ring 37 meshes with the rack 38, causing the rack 38 to drive the gear ring 37 and the short shaft 32 to rotate. This, in turn, causes the short shaft 32 to drive the semi-cylinder 33 and the brush 34 to rotate, making the brush 34 rotate and rub against the filter screen 2, further improving the cleaning effect. In addition, the semi-cylinder 33 drives the air hole 35 to rotate and spray air, increasing the cleaning area of ​​the air hole 35. This allows the air sprayed by the air hole 35 to blow dust over a large area and flow out of the interior of the outer box 1 through the window 5.

[0040] It should be noted that, since the center of the cylindrical structure formed by the semi-cylinder 33 and the brush 34 is far from the axis of the short axis 32, the brush 34 can strike and rub the filter screen 2 with great force, thereby improving the cleaning effect of the brush 34.

[0041] Example 3

[0042] This embodiment is an improvement upon embodiment 2. For details, please refer to [link / reference]. Figures 1-4 Torque springs 36 are also installed on the outer circles of the two short shafts 32. The torque springs 36 are connected to the connecting frame 31. There are several racks 38. The racks 38 are divided into several equal parts and arranged in an array along the movement direction of the connecting frame 31.

[0043] Repeated friction: according to Figure 3 As shown, when one of the racks 38 drives the gear ring 37 and the short shaft 32 to rotate, the short shaft 32 also drives the torque spring 36 to rotate, thereby compressing the torque spring 36. Then, when the gear ring 37 is no longer meshing with the rack 38, the compressed force is released through the torque spring 36, and the torque spring 36 drives the short shaft 32 to rotate in the opposite direction, so that the brush 34 rubs the rotating filter screen 2 in the opposite direction, thereby improving the friction effect. In addition, the air ejected from the air hole 35 can be ejected in the opposite direction to clean the dust.

[0044] Example 4

[0045] This embodiment is an improvement upon embodiment 3. For details, please refer to [link / reference]. Figures 1-4The top of the inner wall of the outer box 1 is also slidably connected to a connecting slider 44. The lower end of the connecting slider 44 is slidably connected to one end of the connecting frame 31. A fourth spring 45 is also installed on the connecting frame 31. The fourth spring 45 is connected to the connecting slider 44.

[0046] A protrusion 39 is installed on the inner wall of the outer casing 1 near the connecting frame 31. The connecting frame 31 is operable to abut against one side of the protrusion 39. Both ends of the protrusion 39 are provided with inclined surfaces 40, and the connecting frame 31 is used to abut against the inclined surfaces 40.

[0047] Left and right friction: according to Figure 4 As shown, when the connecting frame 31 slides to one side, the connecting frame 31 will abut against the protrusion 39, and the protrusion 39 will squeeze the connecting frame 31 to slide to one end, so that the connecting slider 44 will compress the fourth spring 45. Then, when the protrusion 39 no longer abuts the connecting frame 31, the fourth spring 45 pushes the connecting slider 44 back to reset, thereby realizing that the connecting frame 31 drives the brush 34 to slide left and right. The brush 34 rubs the filter screen 2 left and right, so that the brush 34 can clean the filter screen 2 better.

[0048] Example 5

[0049] This embodiment is an improvement upon embodiment 4. For details, please refer to [link / reference]. Figures 1-4 A sleeve 41 is installed at one end of the short shaft 32. A push rod 43 is slidably connected inside the sleeve 41. A third spring 42 is also installed on the inner wall of the sleeve 41. The third spring 42 is connected to the push rod 43. The push rod 43 can be operated to strike the clean cloth 4.

[0050] Straighten: According to Figure 3 As shown, when the cleanroom cloth 4 is not unfolded, it will be folded together, resulting in a gap in the middle of the cleanroom cloth 4. This may cause dust to fall into the gap of the cleanroom cloth 4, so the air ejected by the air hole 35 may not be effective in blowing out the dust. Therefore, the short shaft 32 drives the round sleeve 41 and the push rod 43 to rotate and squeeze the cleanroom cloth 4, so that the cleanroom cloth 4 squeezes the push rod 43 to straighten, thus making the cleanroom cloth 4 form an inclined surface in advance, so that the air hole 35 can eject air to blow the dust to the window 5.

[0051] It should be noted that when the connecting frame 31 moves the cleanroom cloth 4 to the right side of the outer box 1, in order to prevent the push rod 43 from getting stuck on the cleanroom cloth 4, the push rod 43 is slidably connected to the inside of the round sleeve 41. When the cleanroom cloth 4 is not squeezed and stretched by the push rod 43, it is retracted into the inside of the round sleeve 41 by the push rod 43, thereby avoiding jamming.

[0052] Example 6

[0053] This embodiment is an improvement upon embodiment 5. For details, please refer to [link / reference].Figures 1-6 The driving component includes a power box 8 installed on one side of the outer box 1. A rotating shaft 12 is rotatably connected inside the power box 8. A steel cable 10 and an extension block 14 are sequentially installed on the outer circle of the rotating shaft 12. The steel cable 10 passes through the outer box 1 and is connected to the connecting frame 31. A limit plate 19 is also installed at one end of the rotating shaft 12.

[0054] A gear 13 is also installed on the outer circle of the rotating shaft 12, and a rack 7 is installed on one end of the sealing door 6. The rack 7 can operate through the power box 8 and is used to drive the gear 13 to rotate. A first spring 9 is also installed on the inner wall of the outer box 1. The first spring 9 is connected to the connecting frame 31.

[0055] An air box 15 is installed at the lower end of the power box 8. A piston 16 is slidably connected inside the air box 15. A cylinder 17 is installed at the upper end of the piston 16. The cylinder 17 passes through the air box 15. An extension block 14 is used to squeeze the cylinder 17 to slide downward. A second spring 18 is also installed on the inner wall of the air box 15. The second spring 18 is connected to the piston 16. A hose 11 is also installed at one end of the connecting frame 31. The hose 11 is used to supply air to the air hole 35. One end of the hose 11 passes through the outer box 1 and communicates with the inside of the air box 15.

[0056] Drive: When the sealing door 6 is opened, the sealing door 6 drives the rack 7 to slide out of the power box 8, so that the rack 7 drives the gear 13 to rotate, the gear 13 drives the rotating shaft 12 to rotate, and the rotating shaft 12 pulls the steel cable 10, so that the steel cable 10 will gradually wrap around the outer surface of the rotating shaft 12, and then the steel cable 10 pulls the connecting frame 31 to slide to one side, so that the connecting frame 31 drives the brush 34 and the semi-cylinder 33 to clean the filter screen 2. When the rack 7 is inserted into the power box 8 again, the rotating shaft 12 rotates in the opposite direction, and the first spring 9 pushes the connecting frame 31 to reset.

[0057] The short shaft 32 has a first conveying groove 47 that communicates with the air hole 35 inside. The outer circle of one end of the short shaft 32 has a plurality of first holes 46 arranged in a circumferential array around the axis of the short shaft 32. The connecting frame 31 has a second conveying groove 48 that communicates with the hose 11 inside. The second conveying groove 48 is operably connected to the first holes 46.

[0058] Air delivery: according to Figure 5 As shown, when the rotating shaft 12 rotates, the rotating shaft 12 will also drive the extension block 14 to rotate. The extension block 14 continuously squeezes the cylinder 17 to slide downwards. The cylinder 17 drives the piston 16 to slide downwards. The piston 16 squeezes the air inside the air box 15, so that the piston 16 squeezes the air to the hose 11, and then the air is delivered to the air hole 35 through the hose 11 and ejected.

[0059] It should be noted that when the piston 16 slides downward, the piston 16 will drive the second spring 18, and then when the protruding block 14 is no longer pressing the cylinder 17, the second spring 18 will pull the piston 16 to reset.

[0060] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0061] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A low-voltage switchgear for a power distribution center, comprising an outer casing (1) and a sealed door (6) on the outer casing (1), wherein a filter screen (2) is also installed on the top of the outer casing (1), characterized in that: A cleaning component (3) is installed on the inner wall of the outer casing (1) near the filter screen (2). The cleaning component (3) is operable against the filter screen (2). A window (5) is provided on one side of the outer casing (1) and a drive component is installed on the other side of the outer casing (1). The drive component is used to drive the cleaning component (3) to slide. The drive component includes a power box (8) installed on one side of the outer casing (1). A rotating shaft (12) is rotatably connected inside the power box (8). A steel cable (10) and an extension block (14) are installed on the outer circle of the rotating shaft (12) in sequence. The steel cable (10) passes through the outer casing (1) and is connected to the connecting frame (31). A limit plate (19) is also installed at one end of the rotating shaft (12). The outer circle of the rotating shaft (12) is also equipped with a gear (13), and one end of the sealing door (6) is equipped with a rack (7). The rack (7) can operate through the power box (8) and the rack (7) is used to drive the gear (13) to rotate. The inner wall of the outer box (1) is also equipped with a first spring (9), which is connected to the connecting frame (31). The cleaning component (3) is also equipped with a lint-free cloth (4) at its lower end. One end of the lint-free cloth (4) is installed on the inner wall of the outer casing (1) and near the lower end of the window (5). The cleaning component (3) includes a connecting frame (31) that is slidably connected to the inner wall of the outer casing (1). Short shafts (32) are rotatably connected to both sides of one end of the connecting frame (31). A semi-cylinder (33) is connected between the two short shafts (32). An air hole (35) is provided on the semi-cylinder (33). The air hole (35) can operably spray gas to impact the outer surface of the lint-free cloth (4) and the filter screen (2). A brush (34) is installed at the upper end of the semi-cylinder (33). The brush (34) is used to rub the lower end face of the filter screen (2).

2. The low-voltage switchgear of the power distribution center according to claim 1, characterized in that: The semi-cylinder (33) and the brush (34) form a cylindrical structure, with the axis of the cylinder being far from the axis of the short axis (32).

3. The low-voltage switchgear of the power distribution center according to claim 1, characterized in that: One of the short shafts (32) has a gear ring (37) installed on its outer circle, and a rack (38) is also installed on the inner wall of the outer box (1), with the gear ring (37) meshing with the rack (38).

4. The low-voltage switchgear of the power distribution center according to claim 3, characterized in that: The outer circles of the two short shafts (32) are also equipped with torque springs (36), which are connected to the connecting frame (31). There are several racks (38), which are divided into several equal parts and arranged in an array along the movement direction of the connecting frame (31).

5. The low-voltage switchgear of the power distribution center according to claim 4, characterized in that: The top of the inner wall of the outer box (1) is also slidably connected to a connecting slider (44), the lower end of the connecting slider (44) is slidably connected to one end of the connecting frame (31), and a fourth spring (45) is also installed on the connecting frame (31), the fourth spring (45) is connected to the connecting slider (44); A protrusion (39) is also installed on the inner wall of the outer casing (1) near the connecting frame (31), and the connecting frame (31) is operably abutting against one side of the protrusion (39).

6. The low-voltage switchgear of the power distribution center according to claim 4, characterized in that: A sleeve (41) is installed at one end of the short shaft (32). A push rod (43) is slidably connected inside the sleeve (41). A third spring (42) is also installed on the inner wall of the sleeve (41). The third spring (42) is connected to the push rod (43). The push rod (43) can be operated to strike the clean cloth (4).

7. The low-voltage switchgear of the power distribution center according to claim 1, characterized in that: An air box (15) is installed at the lower end of the power box (8). A piston (16) is slidably connected inside the air box (15). A cylinder (17) is installed at the upper end of the piston (16). The cylinder (17) passes through the air box (15). The protruding block (14) is used to squeeze the cylinder (17) to slide downward. A second spring (18) is also installed on the inner wall of the air box (15). The second spring (18) is connected to the piston (16). A hose (11) is also installed at one end of the connecting frame (31). The hose (11) is used to supply air to the air hole (35). One end of the hose (11) passes through the outer box (1) and communicates with the inside of the air box (15).

8. The low-voltage switchgear of the power distribution center according to claim 7, characterized in that: The short shaft (32) has a first conveying groove (47) that communicates with the air hole (35) inside. The outer circle of one end of the short shaft (32) has a plurality of first holes (46) arranged in a circumferential array around the axis of the short shaft (32). The connecting frame (31) has a second conveying groove (48) that communicates with the hose (11) inside. The second conveying groove (48) is operably connected to the first holes (46).

9. The low-voltage switchgear of the power distribution center according to claim 5, characterized in that: Both ends of the protrusion (39) are provided with inclined surfaces (40), and the connecting frame (31) is used to abut against the inclined surfaces (40).

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