Frequency conversion cabinet convenient to protect

Abstract

The invention relates to a frequency conversion cabinet convenient to protect, and relates to the technical field of electrical control equipment, the frequency conversion cabinet comprises a box body and a box door rotatably connected to the front side of the box body, and an electrical assembly is fixedly arranged in the box body; a protection plate is arranged on the outer side face, away from the box door, of the box body, an extension plate is vertically arranged on the top face, close to the box body, of the protection plate, the side face, close to the box body, of the protection plate is rotationally connected with the outer side face of the box body, and a protection protruding plate is detachably connected to the peripheral face of the protection plate. The protection plate can rotate to a horizontal protection state in the direction away from the box body and rotate to a vertical downward state in the direction close to the box body, a limiting piece for limiting the two states of the protection plate is arranged outside the box body, and a protection curtain is arranged on the bottom face of the protection protruding plate. The protective curtain can be unfolded downwards to accurately cover the heat dissipation net, and dust, sundries and the like are effectively prevented from entering the heat dissipation net.

Description

Technical Field

[0001] This application relates to the technical field of electrical control equipment, and in particular to a frequency converter cabinet that is easy to protect. Background Technology

[0002] Currently, in the fields of power electronics and industrial automation, frequency converters play a crucial role as core equipment. They are widely used in various scenarios that require adjusting motor speed and controlling power output, such as the drive of mechanical equipment in factories and ventilation and air conditioning systems in buildings. By precisely controlling the operating frequency of motors, frequency converters achieve energy-saving and efficient production and operation goals. They integrate a variety of key electrical components, which work together to ensure the stable operation of the entire system, making them an indispensable infrastructure in modern industrial and civil fields.

[0003] In related technologies, a frequency converter cabinet includes a cabinet and a door rotatably connected to the front of the cabinet; electrical components (such as circuit breakers, fast-acting fuses, frequency converters, etc.) are fixedly installed inside the cabinet; since the frequency converter cabinet generates a lot of heat during operation, a heat dissipation mesh is specially installed on the outer side of the cabinet to ensure the normal operation of the equipment; the heat dissipation mesh increases the air circulation area, accelerates heat dissipation, and keeps the temperature inside the cabinet within a suitable range, effectively ensuring the performance and lifespan of the electrical components.

[0004] In the aforementioned technologies, when the frequency converter cabinet is installed outdoors and encounters sand and dust, a large amount of dust will enter the interior of the heat dissipation mesh with the airflow. Once this dust enters, it will gradually accumulate on the surface of the electrical components, affecting the heat dissipation efficiency of the components, causing local temperature rise and accelerating component aging. More seriously, dust may also cause faults such as electrical short circuits, causing irreversible damage to the internal electrical components, affecting the normal operation of the frequency converter cabinet, and there is room for improvement. Summary of the Invention

[0005] The purpose of this application is to provide a frequency converter cabinet that is easy to protect, thereby solving the problem in the above-mentioned related technologies that dust and other substances can easily enter the inside of the frequency converter cabinet through the heat dissipation mesh and adhere to the surface of electrical components during sandy weather, affecting heat dissipation efficiency.

[0006] The frequency converter cabinet provided in this application adopts the following technical solution for easy protection: A variable frequency drive (VFD) cabinet with easy protection includes a cabinet and a door rotatably connected to the front of the cabinet. Electrical components are fixed inside the cabinet. A protective plate is provided on the outer side of the cabinet away from the door. An extension plate is vertically provided on the top surface of the protective plate near the cabinet. The side of the protective plate near the cabinet is rotatably connected to the outer side of the cabinet. A protective protrusion is detachably connected to the outer circumference of the protective plate. The protective plate can be rotated to a horizontal protection state away from the cabinet and to a vertical downward state near the cabinet. The outside of the cabinet is provided with limiting members to limit the two states of the protective plate. A protective curtain is provided on the bottom surface of the protective protrusion. The protective curtain can be unfolded downward to protect the heat dissipation mesh when the protective plate is in the horizontal protection state.

[0007] By adopting the above technical solution, the protective plate can be rotated to a horizontal protective state. At this time, the protective curtain on the bottom surface of the protective convex plate can be unfolded downwards to accurately cover the heat dissipation mesh, effectively blocking dust, debris and other objects from entering. This avoids the electrical components from aging due to poor heat dissipation and temperature rise caused by the blockage of the heat dissipation mesh, and even causes electrical short circuits and other faults, greatly improving the stability and safety of equipment operation.

[0008] Optionally, a storage groove is provided on the bottom surface of the protective protrusion, and one side edge of the protective curtain is fixedly connected to the inner wall of the storage groove; a square cover plate is fixedly provided on the edge of the protective curtain away from the protective protrusion, and a pull ring is fixedly provided on the side of the square cover plate away from the protective plate; when the protective curtain is placed into the storage groove, the square cover plate can be detachably installed at the opening edge of the storage groove; when the protective curtain is unfolded in a vertically downward direction, the square cover plate drives the protective curtain to unfold vertically downward.

[0009] By adopting the above technical solution, the storage slot allows the protective curtain to be neatly stored when not in use, preventing it from being damaged by random placement or affecting the overall aesthetics of the inverter cabinet; the detachable installation of the square cover and the edge of the storage slot opening ensures the sealing when stored, preventing dust and other contaminants from entering the storage slot and polluting the protective curtain, while also making it easy to open quickly when needed.

[0010] Optionally, a pull ring is fixed on the side of the square cover away from the protective plate.

[0011] By adopting the above technical solution, the pull ring design allows workers to easily pull the square cover plate, thereby causing the protective curtain to unfold vertically downwards, accurately covering the heat dissipation mesh for protection.

[0012] Optionally, the limiting member is a sliding ladder that is slidably mounted on the right side of the box and can slide up and down and be fixed. The extension plate has a limiting groove on its top surface when the protective plate is in a horizontal protective state. The lower end of the sliding ladder can slide down and insert into the limiting groove when the protective plate is in a horizontal protective state.

[0013] By adopting the above technical solution, the sliding ladder is slidably installed on the right side of the box and can move up and down flexibly. When the protective plate is rotated to the horizontal protective state, the sliding ladder is slid down so that its lower end is accurately inserted into the limiting groove on the top surface of the extension plate. This design cleverly utilizes the cooperation between the sliding ladder and the limiting groove to effectively limit the positional movement of the protective plate in this state and prevent it from rotating due to external force or accidental collision.

[0014] Optionally, dovetail slide rails are fixedly arranged side by side in the vertical direction on the outer side of the box body away from the box door, and a sliding plate is rotatably connected to the upper end of the sliding ladder away from the protective plate. A dovetail groove is opened on the side of the sliding plate near the box body to slide with the dovetail slide rails. A fixing component is provided on the outside of the box body to limit the sliding state of the sliding plate.

[0015] By adopting the above technical solution, this unique dovetail groove structure makes the sliding plate slide more smoothly and steadily on the dovetail slide rail, effectively avoiding shaking and deviation during the sliding process, and ensuring the accuracy of the slide ladder's up and down movement.

[0016] Optionally, the protective protrusion is rotatably connected to the outer circumferential surface of the protective plate; when the protective plate is in a horizontal state, the protective protrusion can rotate towards the sliding ladder to a horizontal protective state, and when the protective plate is in a vertical state, it can rotate away from the sliding ladder to a vertically upward transportation state and to a horizontal maintenance state. The box body is provided with locking elements to lock the protective protrusion in these three states.

[0017] By adopting the above technical solution, when the protective plate is in a horizontal state, it can rotate towards the sliding ladder to a horizontal protective state, further strengthening the protection of the frequency converter cabinet and effectively blocking external factors from interfering with the internal electrical components; when the protective plate is in a vertical state, the protective protrusion can be flexibly rotated to a vertically upward transport state, reducing the space occupied and facilitating the transportation and handling of the frequency converter cabinet; it can also be rotated to a horizontal maintenance state, providing sufficient and convenient operating space for staff to inspect the inside of the cabinet.

[0018] Optionally, the sliding ladder can slide downwards when the protective protrusion is in a horizontal maintenance state; at this time, the lower end of the sliding ladder can contact the ground and be climbed by workers, and the protective curtain can be unfolded to protect the maintenance area.

[0019] By adopting the above technical solution, when the protective protrusion is in a horizontal maintenance state, the sliding ladder can slide down until the lower end touches the ground, forming a stable climbing structure. This makes it convenient for staff to safely climb to a high place to perform maintenance operations on the frequency converter cabinet, avoiding safety hazards caused by climbing with unstable tools. At the same time, the protective curtain can be deployed simultaneously to effectively protect the maintenance area.

[0020] Optionally, when the protective protrusion is in the transport state, two guide rods are fixed side by side on the side near the sliding ladder, and a bending rod is fixed on the side of the two guide rods that are close to each other. Both the guide rods and the bending rods can undergo elastic deformation and return to their original position. The extension plate has a support groove on the top surface when the protective plate is in the vertical downward state. A first groove is formed on the inner wall of the limiting groove, and a second groove is formed on the inner wall of the support groove. When the protective protrusion is in the transport state, the protective curtain can be pre-placed into the storage groove. Then, when the sliding ladder slides down to the lower end and can be inserted into the support groove, the outer side of the sliding ladder abuts against the side of the bending rod near the box.

[0021] By adopting the above technical solution, the guide rod and the upper limit groove of the bending rod provide guidance and limit for the slide ladder's descent, ensuring that the slide ladder can accurately slide to the predetermined position and avoid deviation or shaking during the descent, thus improving operational safety and convenience. At the same time, the protective curtain is pre-installed in the storage slot, and the slide ladder slides down into the support slot with its outer side abutting against the side of the bending rod near the box. This structural design makes the components compact and orderly during transportation, effectively saving space and facilitating transportation and storage.

[0022] Optionally, a plurality of elastic elements are fixedly provided at the lower end of the sliding ladder near the protective plate; the elastic elements can be engaged in the first groove when the lower end of the sliding ladder is inserted into the limiting groove, and the elastic elements can be engaged in the second groove when the lower end of the sliding ladder is inserted into the second groove.

[0023] By adopting the above technical solution, when the limiting groove (when the protective plate is in a horizontal protective state) or the support groove (when the protective plate is in a vertical downward state) is inserted into the lower end of the sliding ladder, the elastic element can be accurately locked into the corresponding first groove or second groove. This locking structure forms an effective locking mechanism, which can prevent the sliding ladder from loosening, shifting or even falling off due to external forces during equipment operation, maintenance or transportation, thereby ensuring that the sliding ladder always stably performs its limiting or supporting functions.

[0024] Optionally, the lower end of the sliding ladder is provided with an installation groove for inserting an elastic element. The elastic element includes a positioning protrusion and a spring. One end of the spring presses one side of the positioning protrusion so that a part of the positioning protrusion protrudes out of the opening of the installation groove. The protruding part of the positioning protrusion is an arc surface, and the arc length corresponding to the arc surface of the protruding part is a minor arc.

[0025] By adopting the above technical solution, this design enables the positioning protrusion to automatically pop out, facilitating smooth insertion into the corresponding groove when the limiting groove or support groove is inserted at the bottom of the slide ladder. Furthermore, the protruding part of the positioning protrusion is designed as a curved surface with a slight arc. On one hand, the curved surface structure makes insertion and removal from the groove smoother, reducing friction and resistance, lowering the operational difficulty, and allowing workers to easily complete the installation and disassembly of the slide ladder. On the other hand, this curved surface design provides stable clamping force after being inserted into the groove, ensuring a secure connection of the slide ladder under various conditions and effectively preventing loosening due to shaking or external impact.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The protective plate can be rotated to a horizontal protective state. At this time, the protective curtain on the bottom surface of the protective protrusion can be unfolded downwards to accurately cover the heat dissipation mesh, effectively blocking dust, debris and other objects from entering. This avoids poor heat dissipation of electrical components and accelerated aging due to temperature rise caused by blockage of the heat dissipation mesh, and even electrical short circuits and other faults, greatly improving the stability and safety of equipment operation. 2. When the limiting groove (with the protective plate in a horizontal protective state) or the support groove (with the protective plate in a vertical downward state) is inserted into the lower end of the sliding ladder, the elastic element can be precisely engaged in the corresponding first or second groove. This engaging structure forms an effective locking mechanism, which can prevent the sliding ladder from loosening, shifting or even falling off due to external forces during equipment operation, maintenance or transportation, thereby ensuring that the sliding ladder always stably performs its limiting or supporting functions. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram illustrating the overall structure of the enclosure and the enclosure door installation and assembly in an embodiment of this application; Figure 2 This is a cross-sectional structural diagram illustrating the installation and cooperation of the protective plate and the extension plate in an embodiment of this application; Figure 3 This is a cross-sectional structural diagram illustrating the installation and cooperation of the sliding ladder and the box body in an embodiment of this application; Figure 4 yes Figure 3 A magnified view of part A in the middle; Figure 5 This is a cross-sectional structural diagram illustrating the installation and cooperation of the sliding plate and the dovetail slide rail in an embodiment of this application; Figure 6 yes Figure 5 A magnified view of part B in the middle section; Figure 7 This is a partially enlarged schematic diagram illustrating the installation and cooperation of the protective curtain and the protective protruding plate in an embodiment of this application; Figure 8 This is a schematic diagram illustrating the overall structure of the protective protruding plate and the protective curtain installation and cooperation in an embodiment of this application; Figure 9 This is a schematic diagram illustrating the overall structure of the protective protrusion and the protective plate in the embodiment of this application. Figure 10 This is a cross-sectional structural diagram illustrating the installation and cooperation of the bent plate and the sliding ladder in an embodiment of this application; Figure 11 This is a cross-sectional structural diagram illustrating the installation and cooperation of the slide ladder and the extension plate in an embodiment of this application; Figure 12 yes Figure 11 A magnified view of part C in the middle; Figure 13 This is a cross-sectional structural diagram illustrating the installation and cooperation of the positioning protrusion and the extension plate in an embodiment of this application.

[0029] In the diagram, 1. Box body; 11. Box door; 12. Dovetail slide rail; 2. Protective plate; 21. Extension plate; 211. Limiting groove; 2111. First groove; 212. Support groove; 2121. Second groove; 3. Protective protrusion; 31. Storage groove; 32. Guide rod; 321. Bending rod; 3211. Limiting groove; 4. Limiting component; 41. Sliding ladder; 411. Guide slot; 412. Mounting slot; 5. Protective curtain; 6. Square cover plate; 61. Pull ring; 7. Sliding plate; 71. Dovetail slide rail; 8. Locking component; 9. Elastic component; 91. Positioning protrusion; 92. Spring. Detailed Implementation

[0030] The present application will be further described in detail below with reference to all the accompanying drawings.

[0031] Example: Reference Figure 1 A variable frequency cabinet with easy protection includes a cabinet 1 and a door 11 rotatably connected to the front side of the cabinet 1. Electrical components (not shown in the figure) are fixedly installed inside the cabinet 1. A protective plate 2 is provided on the outer side of the cabinet 1 away from the door 11. An extension plate 21 is integrally formed vertically on the top surface of the protective plate 2 near the cabinet 1. The side of the protective plate 2 near the cabinet 1 is rotatably connected to the outer side of the cabinet 1. A protective protrusion plate 3 is detachably connected to the outer peripheral surface of the protective plate 2. The protective plate 2 can rotate to a horizontal protective state in the direction away from the box 1 and to a vertical downward state in the direction close to the box 1. The box 1 is provided with a limiting member 4 to limit the two states of the protective plate 2. The bottom surface of the protective protrusion 3 is provided with a protective curtain 5. In daily work scenarios, once the protective plate 2 is in a horizontal protective state, the staff can unfold the protective curtain 5 downwards and cover the outside of the heat dissipation mesh, thereby providing effective protection for the heat dissipation mesh and preventing dust and other impurities from entering the heat dissipation mesh.

[0032] Reference Figure 2 A storage groove 31 is provided on the bottom surface of the protective protrusion 3, and one side edge of the protective curtain 5 is fixedly connected to the inner wall of the storage groove 31; a square cover plate 6 is fixedly installed on the edge of the protective curtain 5 away from the protective protrusion 3, wherein a pull ring 61 is integrally formed on the side of the square cover plate 6 away from the protective plate 2. When the protective curtain 5 is stored in the storage slot 31, the square cover plate 6 is detachably installed at the opening edge of the storage slot 31 to close the storage slot 31. During daily operation of the frequency converter cabinet, the operator only needs to pull the pull ring 61 to move the square cover plate 6, thereby unfolding the protective curtain 5 downward from the storage slot 31 to provide protection for the heat dissipation mesh.

[0033] Reference Figure 2 , Figure 3 and Figure 4 The limiting component 4 is a sliding ladder 41 that is slidably installed on the right side of the box 1 and can slide up and down and be fixed. When the protective plate 2 is rotated to the horizontal protective state, a limiting groove 211 is opened on the top surface of the extension plate 21. At this time, the staff can slide the sliding ladder 41 down so that its lower end is inserted into the limiting groove 211, thereby stably limiting the protective plate 2 in the horizontal protective state.

[0034] Reference Figure 3 , Figure 5 and Figure 6 Box 1 is far from box door 11 (see Figure 1 On the outer side of the slide, dovetail slide rails 12 are fixedly installed side by side in the vertical direction, and the slide ladder 41 is away from the protective plate 2 (see Figure 2 The upper end of the slide plate 7 is rotatably connected to the slide plate 1. The slide plate 7 has a dovetail groove 71 on the side near the box 1 that slides with the dovetail slide rail 12 to ensure that the slide plate 7 can slide smoothly. The box 1 is provided with a fixing component that limits the sliding state of the slide plate 7. The fixing component is a conventional bolt structure, which will not be described in detail here.

[0035] Reference Figure 7 , Figure 8 and Figure 9The protective protrusion 3 is rotatably connected to the outer circumferential surface of the protective plate 2. When the protective plate 2 is in a horizontal state, the protective protrusion 3 can rotate towards the sliding ladder 41 to a horizontal protective state. When the protective plate 2 is in a vertical state, it can rotate away from the sliding ladder 41 to a vertically upward transportation state and to a horizontal maintenance state. The box 1 is equipped with a locking element 8 that locks the protective protrusion 3 in the three states, ensuring that the protective protrusion 3 remains stable in different states. The locking element 8 is a conventional bolt structure, which will not be described in detail here.

[0036] Reference Figure 8 When the protective protruding plate 3 is in a horizontal maintenance state, the sliding ladder 41 can slide downwards. At this time, the lower end of the sliding ladder 41 can contact the ground and allow workers to climb. The protective curtain 5 can be unfolded at this time to protect the maintenance area and effectively prevent external factors from interfering with the maintenance process.

[0037] Reference Figure 9 , Figure 10 and Figure 11 When the protective protruding plate 3 is in the transport state, two guide rods 32 are fixedly installed side by side on the side near the sliding ladder 41. The two guide rods 32 are integrally formed with bent rods 321 on the side that are close to each other. Both the guide rods 32 and the bent rods 321 can undergo elastic deformation and return to their original position. The extension plate 21 has a support groove 212 on the top surface when the protective plate 2 is in the vertical downward state. When the protective protruding plate 3 is in transport condition, the protective curtain 5 (see Figure 2 ) can be pre-placed into the storage slot 31 (see Figure 2 Inside; then move the slide ladder 41 up to a position that does not affect the rotation of the protective protrusion 3, then rotate the protective protrusion 3 to a vertical position and slide the slide ladder 41 down to the lower end where it can be inserted into the support groove 212 of the extension plate 21. At this time, the outer side of the slide ladder 41 abuts against the side of the bending rod 321 near the box, achieving a stable connection and positioning of the protective protrusion 3 and the slide ladder 41; if you want to release the transport state, the staff can first move the slide ladder 41 up, at which time the slide ladder 41 can be released using the bending plate and guide rod 32 with elastic deformation.

[0038] Reference Figure 11 , Figure 12 and Figure 13 Slide 41 is near protective panel 2 (see Figure 2Two elastic elements 9 are fixedly installed at the lower end of the sliding ladder 41. The inner wall of the limiting groove 211 is provided with a first groove 2111, and the inner wall of the support groove 212 is provided with a second groove 2121. The lower end of the sliding ladder 41 is provided with an installation groove 412 for the elastic elements 9 to be inserted. The elastic element 9 includes a positioning protrusion 91 and a spring 92. One end of the spring 92 presses one side of the positioning protrusion 91 so that a part of the positioning protrusion 91 protrudes out of the opening of the installation groove 412. The protruding part of the positioning protrusion 91 is an arc surface, and the arc length corresponding to the arc surface of the protruding part is a minor arc. When the lower end of the slide ladder 41 is inserted into the limiting groove 211 and the support groove 212, the positioning protrusion 91 of the elastic element 9 can be locked into the corresponding first groove 2111 or second groove 2121 by the elastic force of the spring 92, so as to achieve a stable lock of the slide ladder 41 in the corresponding position.

[0039] The implementation principle of this application embodiment is as follows: During daily work, staff can first rotate the protective plate 2 to the horizontal protective state, and then pull the pull ring 61 to unfold the protective curtain 5 downwards and protect the heat dissipation mesh; during maintenance, staff can first rotate the protective plate 2 to the vertical state, and then rotate the protective protrusion 3 to the horizontal maintenance state, and the sliding ladder 41 slides down to contact the ground for staff to climb. At this time, the protective curtain 5 unfolds to protect the maintenance area; during transportation, the protective curtain 5 can first be placed into the storage slot 31, and then the protective protrusion 3 can be rotated to the vertical upward state to ensure safe and stable transportation.

[0040] Unless otherwise defined, the terms or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar words used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "a" or "one," and similar words do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising," "including," and similar words mean that the element or object preceding "comprising" encompasses the element or object listed following "comprising" or "including," and their equivalents, but do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0041] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A variable frequency drive cabinet that is easy to protect, comprising a cabinet (1) and a door (11) rotatably connected to the front side of the cabinet (1), wherein electrical components are fixedly disposed inside the cabinet (1); characterized in that, The outer side of the box (1) away from the box door (11) is provided with a protective plate (2). An extension plate (21) is provided on the top surface of the protective plate (2) near the box (1). The side of the protective plate (2) near the box (1) is rotatably connected to the outer side of the box (1). A protective protrusion plate (3) is detachably connected to the outer peripheral surface of the protective plate (2). The protective plate (2) can rotate to a horizontal protective state away from the box (1) and to a vertically downward state towards the box (1). The box (1) is provided with a limiting member (4) to limit the two states of the protective plate (2). The bottom surface of the protective protrusion (3) is provided with a protective curtain (5). When the protective plate (2) is in the horizontal protective state, the protective curtain (5) can be unfolded downward to protect the heat dissipation mesh.

2. The frequency converter cabinet with easy protection according to claim 1, characterized in that, A storage groove (31) is provided on the bottom surface of the protective protrusion (3), and one side edge of the protective curtain (5) is fixedly connected to the inner wall of the storage groove (31); a square cover plate (6) is fixedly provided on the edge of the protective curtain (5) away from the protective protrusion (3). When the protective curtain (5) is placed into the storage slot (31), the square cover plate (6) is detachably installed at the edge of the opening of the storage slot (31); when the protective curtain (5) is unfolded in the vertically downward direction, the square cover plate (6) drives the protective curtain (5) to unfold vertically downward.

3. The frequency converter cabinet with easy protection according to claim 2, characterized in that, A pull ring (61) is fixed on the side of the square cover plate (6) away from the protective plate (2).

4. The frequency converter cabinet with easy protection according to claim 1, characterized in that, The limiting member (4) is a sliding ladder (41) that is slidably mounted on the right side of the box (1) and can slide up and down and be fixed. The extension plate (21) has a limiting groove (211) on the top surface of the protective plate (2) when it is in a horizontal protective state. The lower end of the sliding ladder (41) can slide down and insert into the limiting groove (211) when the protective plate (2) is in a horizontal protective state.

5. The frequency converter cabinet with easy protection according to claim 4, characterized in that, The box body (1) is provided with dovetail slide rails (12) arranged vertically on the outer side away from the box door (11). The upper end of the sliding ladder (41) away from the protective plate (2) is rotatably connected to a sliding plate (7). The sliding plate (7) has a dovetail groove (71) on the side near the box body (1) that slides with the dovetail slide rails (12). The box body (1) is provided with a fixing member to limit the sliding state of the sliding plate (7).

6. The frequency converter cabinet with easy protection according to claim 1, characterized in that, The protective protrusion (3) is rotatably connected to the outer circumferential surface of the protective plate (2); when the protective plate (2) is in a horizontal state, the protective protrusion (3) can rotate towards the sliding ladder (41) to a horizontal protective state, and when the protective plate (2) is in a vertical state, it can rotate away from the sliding ladder (41) to a vertically upward transportation state and to a horizontal maintenance state. The box (1) is provided with a locking member (8) on the outside to lock the three states of the protective protrusion (3).

7. A frequency converter cabinet with easy protection according to claim 6, characterized in that, The sliding ladder (41) can slide downwards when the protective protrusion (3) is in a horizontal maintenance state; at this time, the lower end of the sliding ladder (41) can contact the ground and be climbed by workers, and the protective curtain (5) can be unfolded to protect the maintenance area.

8. A frequency converter cabinet with easy protection according to claim 4, characterized in that, When the protective protrusion (3) is in the transport state, two guide rods (32) are fixedly arranged side by side on the side of the sliding ladder (41). A bent rod (321) is fixedly arranged on the side of the two guide rods (32) that are close to each other. Both the guide rod (32) and the bent rod (321) can undergo elastic deformation and return to their original position. The extension plate (21) has a support groove (212) on its top surface when the protective plate (2) is in a vertically downward state. The inner wall of the limiting groove (211) has a first groove (2111) and the inner wall of the support groove (212) has a second groove (2121). The protective curtain (5) can be pre-placed into the storage groove (31) when the protective protrusion (3) is in the transport state. Then, when the sliding ladder (41) slides down to the point where the lower end can be inserted into the support groove (212), the outer side of the sliding ladder (41) abuts against the side of the bending rod (321) near the box (1).

9. A frequency converter cabinet with easy protection according to claim 8, characterized in that, The sliding ladder (41) is fixed with several elastic members (9) near the lower end of the protective plate (2). When the lower end of the sliding ladder (41) is inserted into the limiting groove (211), the elastic member (9) can be inserted into the first groove (2111); when the lower end of the sliding ladder (41) is inserted into the second groove (2121), the elastic member (9) can be inserted into the second groove (2121).

10. A frequency converter cabinet with easy protection according to claim 9, characterized in that, The lower end of the sliding ladder (41) is provided with an installation groove (412) for inserting the elastic element (9). The elastic element (9) includes a positioning protrusion (91) and a spring (92). One end of the spring (92) presses one side of the positioning protrusion (91) so that a part of the positioning protrusion (91) protrudes out of the opening of the installation groove (412). The protruding part of the positioning protrusion (91) is an arc surface, and the arc length corresponding to the arc surface of the protruding part is a minor arc.

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