An electrical frequency conversion cabinet

Abstract

This invention discloses an electrical frequency converter cabinet, relating to the technical field of frequency converter cabinets. It includes a base cabinet, a top cabinet, a cross-shaped beam, and a lifting cabinet. The top of the base cabinet is connected to the bottom of the top cabinet and divided into four storage spaces by the cross-shaped beam. A mounting plate for installing frequency converters, reactors, and filter components is fixedly installed inside the base cabinet. A lifting cabinet is installed inside the top cabinet, and the lifting cabinet is driven to move up and down by a lifting drive component. The lifting cabinet and the mounting plate are staggered in the lateral projection direction. This invention optimizes the space utilization of the overall layout and enhances equipment safety and performance.

Description

Technical Field

[0001] This invention relates to the technical field of frequency converter cabinets, and in particular to an electrical frequency converter cabinet. Background Technology

[0002] A frequency converter cabinet is an electrical control device that integrates a frequency converter and related control components. Its core function is to precisely regulate the speed and torque of an AC motor. Given the frequent need to control high-power motors in modern industrial applications, multiple frequency converter cabinets are typically combined and operate in concert. To meet the demands of high-power supply, these combined frequency converter cabinets generally employ copper busbars for power distribution to ensure stable operation of the frequency converter.

[0003] However, the current design presents several potential challenges. First, the exposed copper busbars pose a risk of electric shock to maintenance personnel. To improve safety, some manufacturers choose to completely enclose the rear of the cabinet, but this results in wasted internal space. Second, the high-voltage, high-current environment required for inverter operation can easily cause electromagnetic interference to network communication signals, leading to communication instability and affecting the overall reliability of the system. Furthermore, some equipment inside the inverter cabinet that involves critical control functions is often exposed under traditional installation methods, making it highly susceptible to malfunction due to unintentional touch or misoperation, thus affecting production continuity.

[0004] However, existing electrical frequency converter cabinets typically house the high-voltage power supply components and the main working components, such as the frequency converter, within the same cabinet. This layout poses a safety hazard because electromagnetic interference between the high-voltage copper busbars and the low-voltage control components can easily cause malfunctions, and it also increases the risk of accidental electric shock to maintenance personnel. Summary of the Invention

[0005] This application provides an electrical frequency converter cabinet that optimizes the space utilization of the overall layout and enhances the safety and performance of the equipment.

[0006] This application provides an electrical frequency converter cabinet, which adopts the following technical solution: An electrical frequency converter cabinet includes a base cabinet, a top cabinet, a cross-shaped beam, and a lifting cabinet; the top of the base cabinet is connected to the bottom of the top cabinet and is divided into four storage spaces by the cross-shaped beam; a mounting plate for installing frequency converters, reactors, and filter components is fixedly installed inside the base cabinet; a lifting cabinet is provided inside the top cabinet, the lifting cabinet is driven to move up and down by a lifting drive, and the lifting cabinet and the mounting plate are staggered in the lateral projection direction.

[0007] Preferably, a lower limit bar is fixedly installed inside the base cabinet, and four lower stops are provided on the top of the lower limit bar. The lower stops are located directly below the four corners of the lifting cabinet and contact the outer wall of the lifting cabinet to limit the lowering limit position.

[0008] Preferably, the lifting drive component includes a drive motor, a guide rail, and a gear chain transmission assembly; the guide rail is symmetrically arranged on the inner wall of the top cabinet, and the back of the lifting cabinet is slidably connected to the guide rail via a slider; the output end of the drive motor is connected to a gear plate, the gear plate meshes to drive the gear chain to move, and the end of the gear chain is connected to the center position of the back of the lifting cabinet.

[0009] Preferably, the bottom cabinet side wall is provided with a cabinet door, and the cabinet door rotation shaft is electrically connected to the circuit breaker through a mechanical chain breaking locking mechanism. The mechanical chain breaking locking mechanism includes an insulating box, a trigger rod, a spherical insulator, and a conductive block. The trigger rod drives the insulating rod to move along the first strip hole as the cabinet door rotates to break the contact between the conductive block and the first conductive body.

[0010] Preferably, the mechanical chain breaking locking mechanism further includes a first connecting block, a rotating rod, and a rotating block; the radial surface of the rotating block is provided with a limiting hole that cooperates with a limiting post at the end of the trigger rod, and the rotating rod passes through the center of the spherical insulator and drives the first connecting block to rotate so as to move the insulating rod.

[0011] Preferably, the bottom cabinet is equipped with a high-impedance dynamic equalization discharge unit and a multi-point fiber optic isolation voltage detection module; the high-impedance dynamic equalization discharge unit is electrically connected to the DC bus capacitor, and the voltage detection module displays the safety status through a multi-color safety status indicator light on the outside of the top cabinet.

[0012] Preferably, a digital display screen is installed on the outside of the top cabinet, and an electromagnetic interlock device is installed on the cabinet door. The digital display screen is connected to the voltage detection module. The multi-color safety status indicator includes red, yellow, and green indicators. The electromagnetic interlock device locks or releases the cabinet door in response to the voltage detection module signal.

[0013] Preferably, a second conductor is provided inside the insulating box, and the second conductor is connected to the power supply of the drive motor through a second spring wire; a second strip hole is provided on the spherical insulator and forms an L-shaped path with the first strip hole, and the insulating rod can move along the L-shaped path to the second conductor to establish an electrical connection.

[0014] Preferably, the inner end of the insulating rod is connected to a limiting ball, the surface of which is provided with a strip groove, and the outside of the insulating box is provided with a handle and a damping shaft. The handle drives the limiting ball to rotate through the second connecting block to guide the insulating rod to move along the second strip hole.

[0015] Preferably, the cross-shaped beam is formed by welding two mutually perpendicular I-beams, and the four corners of the lifting cabinet are provided with anti-collision buffer pads.

[0016] In summary, this application has the following beneficial effects: 1. The drive motor in this frequency converter cabinet provides power, which drives the gear chain via a rotating gear disc, thereby pulling the lifting cabinet smoothly up to the preset height along the guide rail. The guide rail ensures the vertical stability of the lifting cabinet, preventing lateral deviation or swaying during the ascent. The cooperation between the gear chain and the gear disc ensures the accuracy and reliability of the movement. When the lifting cabinet reaches its highest position, the copper busbars are raised to a position away from the operating area, effectively reducing the risk of operators touching high-voltage areas. Simultaneously, the components within the top and bottom cabinets are horizontally staggered, maintaining a certain physical distance between the high-voltage copper busbars and the frequency converters of the low-voltage components, thus reducing electromagnetic interference and improving system stability and network communication efficiency. Overall, the lifting cabinet, through the coordinated work of the drive motor, guide rail, gear disc, and gear chain, achieves flexible lifting of the copper busbars, thereby optimizing the space utilization of the overall layout and enhancing the safety and performance of the equipment.

[0017] 2. The lifting drive unit and motor in this frequency converter cabinet work together to drive the lifting cabinet to descend smoothly via a counter-rotating gear disc and chain. The lower limit bar and lower stop block provide physical restraint during descent; once the bottom of the lifting cabinet contacts the lower stop block, descent immediately stops, ensuring a safe operating height. The lower stop block ensures the copper busbars are lowered to a safe position and remain laterally offset from the mounting plate assembly, thus providing an independent operating space for maintenance and reducing downtime during maintenance. Specifically, this mechanism is activated by first initiating the descent. After receiving the command, the lifting drive unit starts the motor to rotate in the opposite direction, driving the gear disc and chain downwards, pushing the lifting cabinet to descend smoothly along the guide rail. Simultaneously, the lower limit bar and lower stop block at the four corners of the lifting cabinet provide physical restraint during descent; once the bottom contacts the lower stop block, descent immediately stops, ensuring safety. Finally, the copper busbars are lowered to a safe position in the bottom cabinet, maintaining a lateral offset from the mounting plate assembly, creating a safe and independent space for maintenance operations, thereby reducing the time required for maintenance interruptions.

[0018] 3. When the trigger rod in the frequency converter cabinet rotates via the hinge shaft as the cabinet door opens, it drives the L-shaped first connecting block and the limiting post, causing the limiting ball to rotate within the spherical insulator cavity, ensuring the circuit breaker control circuit is disconnected and achieving mechanical forced power disconnection. The insulating rod moves along the first strip hole, causing the outer spherical conductive block to detach from the first conductor, cutting off the current path. The high-impedance dynamic equalization discharge unit rapidly and in a controlled manner discharges the internal DC bus capacitors, eliminating the risk of residual charge. The multi-point fiber optic isolation voltage detection module monitors the voltage of key nodes inside the cabinet in real time. When the voltage drops to a preset safety threshold and stabilizes, the multi-color safety status indicator light on the outside of the top cabinet displays "Safe and ready for maintenance," and the digital display screen also shows relevant information. The electromagnetic interlock device keeps the cabinet door locked to prevent accidental opening. When the cabinet door opens, the trigger control rod rotates, driving other components, thereby cutting off the circuit and starting discharge. After the multi-point fiber optic isolation voltage detection module detects that the voltage has dropped to a safe range, the indicator light displays a safe status, ensuring that maintenance personnel can safely enter for maintenance.

[0019] 4. During maintenance, if the lifting drive requires power to operate the lifting cabinet, the linkage mechanism in Example 3 comes into play. First, after the cabinet door is fully opened, the insulating rod has moved to the "L"-shaped intersection of the first and second slots. Then, the operator manually drives the mounting component, guiding the limiting ball to rotate through the slot and protrusion, pushing the insulating rod horizontally along the second slot, ultimately establishing an electrical connection with the second conductor. This allows external power to supply power to the drive motor through the second spring wire, driving the lifting drive without requiring a separate external power supply, simplifying wiring and improving reliability. The damping shaft ensures smooth operation and prevents malfunctions.

[0020] 5. Through multi-layered linkage of mechanical, electrical, and control systems, safe isolation of high-voltage components, automated maintenance, and efficient space utilization are achieved. The overall operation process unfolds clearly in chronological order, ensuring a balance between safety and efficiency during normal operation, maintenance, and repair phases.

[0021] 6. By mechanically cutting off power, automatically discharging rapidly, and monitoring voltage at multiple points in real time, the dangers caused by live work and residual charge are eliminated at the source. The shutdown, discharge, and safety verification processes are automated and supplemented by physical interlocks, effectively preventing personal injury caused by negligence, misjudgment, or omissions. Multi-color safety status indicator lights and digital displays provide immediate and clear safety status information, eliminating the need for professional judgment and reducing communication and understanding barriers. In summary, the "Zero-Energy Safety Maintenance Station," through its integrated mechanical, electrical, and control systems, constructs a multi-level, proactive safety protection system, effectively solving the problems of low efficiency and high safety risks in traditional electrical equipment maintenance. This allows for automated and visual assurance that all potential energy sources are completely isolated and safely discharged before maintenance, significantly simplifying the pre-maintenance safety verification process and providing 100% energy safety status assurance. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the electrical frequency converter cabinet in Embodiment 1; Figure 2 This is a schematic diagram of the overall connection structure between the bottom cabinet and the top cabinet in Embodiment 1. Figure 3 This is a schematic diagram of the internal structure of the lifting drive component in Embodiment 1. Figure 4 This is a schematic diagram of the overall structure of the distribution between the multi-color safety status indicator lights and the digital display screen in Embodiment 2. Figure 5 This is a schematic diagram of the overall connection structure between the hinge shaft and the insulation box in Embodiment 2. Figure 6 This is a schematic diagram of the internal structure of the mechanical chain breaking locking mechanism in Embodiment 2; Figure 7 This is a schematic diagram of the overall connection structure between the insulating rod, the conductive block, and the limiting ball in Embodiment 2. Figure 8 This is a schematic diagram of the connection structure between the first strip hole and the second strip hole in Embodiment 3; Figure 9 This is a schematic diagram of the internal structure of the mounting component in embodiment 3; Explanation of reference numerals in the attached drawings: 1. Base cabinet; 2. Top cabinet; 3. Crossbeam; 4. Mounting plate; 5. Lifting cabinet; 6. Lifting drive component; 601. Drive motor; 602. Guide rail; 603. Gear plate; 604. Gear chain; 7. Lower limit rod; 8. Lower stop block; 9. Circuit breaker; 10. Cabinet door; 11. Hinge shaft; 12. Mechanical chain breakage locking mechanism; 1201. Insulation box; 1202. Actuating rod; 1203. First conductor; 1204. Spherical insulator; 1205. First spring wire; 1206. First strip hole; 1207. Insulating rod; 120 8. Conductive block; 1209. Limiting ball; 13. Multi-color safety status indicator light; 14. Digital display screen; 15. High-impedance dynamic equalization discharge unit; 16. Linking component; 1601. First connecting block; 1602. Limiting post; 1603. Rotating rod; 1604. Rotating block; 1605. Limiting hole; 17. Second conductor; 18. Second spring wire; 19. Second strip hole; 20. Mounting component; 2001. Strip groove; 2002. Handle; 2003. Damping rotating shaft; 2004. Second connecting block; 2005. Fixed shaft; 2006. Protrusion block. Detailed Implementation

[0023] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content. Example 1

[0024] This invention discloses an electrical frequency converter cabinet, such as Figure 1 and Figure 2 As shown, it includes a base cabinet 1, a top cabinet 2 on the top of the base cabinet 1, the top of the base cabinet 1 and the bottom of the top cabinet 2 are connected and a cross-shaped beam 3 is provided at the junction. The cross-shaped beam 3 divides the internal cavity of the base cabinet 1 and the top cabinet 2 into four storage spaces in the horizontal direction.

[0025] like Figure 1 and Figure 2 As shown, the storage space of the bottom cabinet 1 is fixedly equipped with a mounting plate 4 for installing frequency converters, reactors and filter components. The storage space of the top cabinet 2 is equipped with a lifting cabinet 5 that can be raised and lowered. The lifting cabinet 5 is driven by a lifting drive component 6 fixed in the top cabinet 2. The lifting cabinet 5 is used to install copper busbars. The lifting cabinet 5 and the mounting plate 4 and the components installed on them are all horizontally offset.

[0026] The cabinet is vertically divided by a bottom cabinet 1 and a top cabinet 2, and horizontally divided into four storage spaces by a cross-shaped beam 3. This layering first physically separates the copper busbars of the high-voltage power supply section from the main working components such as frequency converters, reactors, and filters.

[0027] The lifting cabinet 5 inside the top cabinet 2 carries the copper busbars and moves up and down via an independent lifting drive 6. During normal operation, the copper busbars are located at the top. When maintenance or to ensure operational safety, the lifting cabinet 5 lowers the copper busbars to the bottom cabinet 1 or a safer, more protected location. By centrally housing the high-voltage, energized copper busbars in the top lifting cabinet 5 and keeping them in a high or retracted position during daily operation, the risk of maintenance personnel accidentally touching the energized copper busbars is greatly reduced, resolving the safety hazards present in traditional frequency converter cabinet combinations. When maintenance is required, the independent lifting drive 6 lowers the copper busbars, allowing operation in a power-off or more controlled environment, further enhancing maintenance safety.

[0028] The copper busbars inside the lifting cabinet 5 are horizontally staggered from the mounting plate 4 and its inverter components inside the base cabinet 1. This means that even when the copper busbars are lowered, they will not interfere with important operating components inside the base cabinet 1, ensuring efficient use of space and operational independence. By utilizing the top space of the cabinet to install the copper busbars, combined with the lifting mechanism and horizontal staggered design, the problem of completely enclosing the rear of the cabinet for safety reasons, thus avoiding wasted space, is avoided. This design makes the overall cabinet structure more compact and the functional areas clearly defined. The clever use of vertical and horizontal staggered space integrates additional safety and functional features without increasing the external dimensions of the cabinet.

[0029] The physical separation and optimized layout of the copper busbars in the high-voltage section and the frequency converters and control components in the low-voltage control section help reduce electromagnetic interference from high-voltage to low-voltage signals, potentially indirectly improving network communication stability and resolving communication instability issues present in traditional designs. When copper busbar maintenance is required, the lifting drive unit 6 can conveniently and safely lower the copper busbars to an operable position, simplifying the maintenance process and improving maintenance efficiency.

[0030] like Figure 1 and Figure 2As shown, furthermore, a lower limit bar 7 is fixedly installed inside the base cabinet 1 and directly below the lifting cabinet 5. Lower stop blocks 8 are fixedly installed on the lower limit bar 7. Four lower stop blocks 8 are provided, each located directly below one of the four corners of the lifting cabinet 5. During the descent of the lifting cabinet 5, the bottom of the four corners of the lifting cabinet 5 will physically contact the lower stop blocks 8 fixedly installed on the lower limit bar 7. Since the lower stop blocks 8 are fixed and sturdy, this physical contact will forcibly prevent the lifting cabinet 5 from continuing to descend, thereby limiting the descent height of the lifting cabinet 5 to a preset safe range. Through physical restriction, it can be ensured that the lifting cabinet 5 will not descend to a height that could cause squeezing, collision, or provide an unsafe working space for maintenance personnel, thereby effectively avoiding accidents and ensuring personnel safety.

[0031] like Figure 2 and Figure 3 As shown, the lifting drive component 6 further includes a drive motor 601 fixed inside the top cabinet 2 and symmetrically arranged guide rails 602. The back of the lifting cabinet 5 slides inside the guide rails 602 via a slider. The output end of the drive motor 601 is connected to a gear disc 603, and a gear chain 604 is meshed with the outer side of the gear disc 603. The gear chain 604 is connected to the center of the back of the lifting cabinet 5 via a connecting block. When the drive motor 601 rotates forward, the gear disc 603 drives the gear chain 604 to move upward, thereby pulling the lifting cabinet 5 up. When the motor rotates in the reverse direction, the gear disc 603 drives the gear chain 604 to move downward, thereby pushing or guiding the lifting cabinet 5 down. The back of the lifting cabinet 5 is slidably connected to the symmetrically arranged guide rails 602 via a slider. The function of the guide rails 602 is to provide a stable vertical movement path for the lifting cabinet 5, preventing it from swaying, tilting, or jamming during rising or falling, and ensuring the smoothness and accuracy of the movement.

[0032] The symmetrically arranged guide rails 602 and sliders ensure the stable and smooth movement of the lifting cabinet 5 in the vertical direction, effectively reducing shaking and friction during operation and improving the reliability of equipment operation. Example 2

[0033] In large industrial production lines, "zero-energy safety maintenance stations" require maintenance personnel to perform strict shutdown and energy isolation procedures before routine inspections or troubleshooting of electrical frequency converter cabinets. Currently, these operations often involve multiple manual steps, such as disconnecting the main power switch, waiting for capacitors to discharge naturally, and using a multimeter to measure point by point to confirm the absence of power. This process is time-consuming and carries the risk of human error, especially in the detection and handling of residual internal charges. Misjudgment can easily lead to electric shock or arc flashover accidents, seriously threatening the lives of maintenance personnel.

[0034] like Figure 4As shown, a cabinet door 10 is provided on one side of the base cabinet 1. The cabinet door 10 rotates inside the base cabinet 1 via a hinge shaft 11. A circuit breaker 9 is installed inside the base cabinet 1. The external power supply of the circuit breaker 9 is connected to the hinge shaft 11 of the cabinet door 10 via a mechanical chain-breaking locking mechanism 12 to ensure that all main power inputs are physically disconnected the moment the cabinet door 10 is attempted to be opened. At the same time, the base cabinet 1 is equipped with a high-impedance dynamic equalization discharge unit 15. After the main power is disconnected, the high-impedance dynamic equalization discharge unit 15 can immediately, automatically and in a controlled manner rapidly discharge the large-capacity DC bus capacitor inside and monitor the discharge process in real time. A multi-point fiber optic isolation voltage detection module continuously monitors the voltage of multiple key nodes inside the cabinet. Once the voltage at all monitoring points synchronously drops to a preset safety threshold (e.g., below 50V) and remains stable for a certain period, a multi-color safety status indicator light 13 on the outside of the top cabinet 2 clearly and intuitively informs maintenance personnel that "safely discharged, door can be opened for maintenance" via a digital display screen 14. For example, red indicates "electrical danger," yellow indicates "discharging," and green indicates "safe for maintenance." Before this safe state is achieved, the electromagnetic interlock device on the cabinet door 10 will remain locked, physically preventing any attempt to open the cabinet door 10.

[0035] like Figure 5 and Figure 6 As shown, specifically, the mechanical chain breaking locking mechanism 12 includes an insulating box 1201 and an actuating rod 1202 fixed on the hinge shaft 11. The insulating box 1201 has a first conductor 1203 and a hollow spherical insulator 1204 inside. The first conductor 1203 is electrically connected to the circuit breaker 9 through a first spring wire 1205. The surface of the spherical insulator 1204 is provided with a first strip hole 1206. The central axis of the first strip hole 1206 faces the first conductor 1203. The inside of the first strip hole 1206 is provided with an insulating rod 1207. The outer end of the insulating rod 1207 is provided with a spherical conductive block 1208. The inner end of the insulating rod 1207 passes through the first strip hole 1206 and is connected to a limiting ball 1209. The inside of the insulating rod 1207 is provided with a power line for electrically connecting an external power source and the conductive block 1208.

[0036] The spherical conductive block 1208 at the outer end of the insulating rod 1207 is in close contact with the first conductor 1203, forming a conductive path. Current flows through the power line, the conductive block 1208, and the first conductor 1203, and is electrically connected to the circuit breaker 9 through the first spring wire 1205, putting the equipment in a powered state.

[0037] When the actuating rod 1202, which is fixed to the hinge pivot 11, rotates, the actuating rod 1202 will drive the limiting ball 1209 to rotate within the internal cavity of the spherical insulator 1204 via the linkage 16. Since the limiting ball 1209 is connected to the inner end of the insulating rod 1207, the rotation of the limiting ball 1209 will drive the insulating rod 1207 to move along the central axis of the first strip hole 1206.

[0038] As the insulating rod 1207 moves, the spherical conductive block 1208 at its outer end gradually moves away and eventually completely disengages from the first conductor 1203. Once the conductive block 1208 separates from the first conductor 1203, the current conduction path is cut off, thereby achieving the power-off function of the circuit breaker 9 and disconnecting the entire circuit.

[0039] This system achieves interlocking between mechanical and electrical systems. Before any safe operation is required, the power supply is forcibly cut off to prevent electric shock or accidental equipment startup, significantly improving operational safety. The aforementioned mechanical linkage method boasts a relatively stable and reliable physical structure, making it less susceptible to electromagnetic interference or software malfunctions, ensuring effective power-off operations at critical moments. This physical linkage also eliminates the risk of forgetting to disconnect the power. Power is automatically cut off upon performing a specific mechanical action, reducing accidents caused by human negligence.

[0040] like Figure 6 and Figure 7As shown, the linkage 16 further includes an L-shaped first connecting block 1601 disposed in the cavity of the spherical insulator 1204 and a limiting post 1602 fixed to the end of the trigger rod 1202. The first connecting block 1601 is located in the interlayer between the limiting ball 1209 and the cavity of the spherical insulator 1204. The first connecting block 1601 and the limiting ball 1209 are movably connected. A rotating rod 1603 is disposed at the bottom center of the first connecting block 1601. The extension line of the central axis of the rotating rod 1603 passes through the center point of the spherical insulator 1204. The bottom of the rotating rod 1603 passes through the bottom of the spherical insulator 1204 and is connected to the rotating block 1604. The radial surface of the rotating block 1604 is provided with a strip structure and a limiting hole 1605 that matches the limiting post 1602. Specifically, the rotation of the hinge shaft 11 causes one end of the trigger rod 1202 to move in a circular motion around its central axis. The limiting post 1602 at the end of the actuating rod 1202 is confined within the sliding trajectory of the strip-shaped limiting hole 1605 on the radial surface of the rotating block 1604. When the actuating rod 1202 makes a circular motion, the limiting post 1602 slides within the limiting hole 1605. This special geometric fit effectively converts the circular motion of the actuating rod 1202 into the rotational motion of the rotating block 1604. The rotation of the rotating block 1604 drives the rotating rod 1603 connected to it to rotate synchronously. Since the central axis of the rotating rod 1603 passes through the center point of the spherical insulator 1204 and is connected to the first connecting block 1601 with an L-shaped structure, the rotation of the rotating rod 1603 drives the first connecting block 1601 to rotate within the cavity of the spherical insulator 1204. Example 3

[0041] In Embodiment 1, if the drive motor 601 within the lifting drive unit 6 requires a separate external power supply for continuous power, this would significantly complicate the wiring scheme. The added power lines would not only occupy the limited space inside the inverter cabinet, causing a cluttered internal environment, but would also bring significant inconvenience during routine maintenance and fault diagnosis.

[0042] This wiring method inevitably increases the complexity of initial installation and the corresponding labor costs. More importantly, the dense and complex wiring harness layout not only greatly increases the difficulty and time required for troubleshooting electrical faults, but may also affect the long-term operational stability and reliability of the equipment due to mutual interference between harnesses or insufficient local heat dissipation. From a life-cycle perspective, this design will undoubtedly prolong unplanned downtime and significantly increase overall operation and maintenance costs.

[0043] The second conductor 17 is fixedly installed inside the insulation box 1201. The second conductor 17 is electrically connected to the power supply of the drive motor 601 in the lifting drive component 6 through the second spring wire 18. The first conductor 1203 and the second conductor 17 are staggered and are located on both sides of the spherical insulator 1204. The spherical insulator 1204 is provided with a second strip hole 19. The second strip hole 19 is perpendicular to the first strip hole 1206 and the first strip hole 1206 and the second strip hole 19 are interconnected and form an "L" shaped structure. The central axis of the second strip hole 19 faces the second conductor 17.

[0044] When the cabinet door 10 of the frequency converter cabinet is fully opened, the rotation of the hinge shaft 11 drives an insulating rod 1207 to move along the first strip hole 1206 until it reaches the intersection with the second strip hole 19, forming an "L" shaped corner.

[0045] After the insulating rod 1207 reaches the corner, the operator manually drives the mounting piece 20 to rotate the limiting ball 1209. The limiting ball 1209 is designed to guide the insulating rod 1207 to turn from the vertical first strip hole 1206 path into the horizontal second strip hole 19 path.

[0046] After turning, the insulating rod 1207 continues to move along the second slot 19. Since the central axis of the second slot 19 is oriented toward the second conductor 17, the insulating rod 1207 eventually moves to the end of the second slot 19 and establishes a stable electrical connection with the second conductor 17, which is fixedly installed inside the insulating box 1201.

[0047] Once the insulating rod 1207 is connected to the second conductor 17, a closed electrical circuit is formed between the external power supply and the power supply of the drive motor 601 in the lifting drive component 6. The second conductor 17 is electrically connected to the power supply of the drive motor 601 through the second spring wire 18. The establishment of the closed circuit enables the drive motor 601 to receive continuous power, thereby achieving synchronous driving of the lifting drive component 6.

[0048] This device primarily addresses the wiring complexity and maintenance inconvenience associated with traditional independent power supply methods. Specifically, it eliminates the need for a separate external power supply for the drive motor 601 within the lifting drive unit 6. This means fewer additional power lines, resulting in cleaner and more organized wiring within the frequency converter cabinet. The reduced power lines allow for more efficient use of the limited space inside the cabinet, preventing congestion and clutter, and improving the overall layout efficiency. Integrating the power connection into the cabinet door 10 operation and manual drive creates a unified solution, reducing external intervention and potential contact defects, and improving power supply reliability and system integration.

[0049] Furthermore, compared to a straight line, an L-shaped path requires the user to complete a more complex and conscious sequence of actions (e.g., rotating in one direction and then turning in another), rather than simply pushing, pulling, or rotating on a single axis. This significantly reduces the possibility of accidental power switching due to accidental touches, shaking, or unintentional operation.

[0050] like Figure 9 As shown, the mounting component 20 includes a strip groove 2001 formed on the surface of the limiting ball 1209 and a handle 2002 that rotates on the insulation box 1201. A damping shaft 2003 is provided on the handle 2002. The damping shaft 2003 passes through the inner wall of the insulation box 1201 and is connected to a second connecting block 2004. The second connecting block 2004 is fixedly connected to the limiting ball 1209 by a fixing shaft 2005. The opening of the strip groove 2001 faces and is parallel to the surface. On the long side axis of the second strip hole 19, the first connecting block 1601 and the limiting ball 1209 are movably disposed. Specifically, the first connecting block 1601 is provided with a protrusion 2006, and the limiting block slides inside the strip groove 2001. When the first connecting block 1601 rotates, the width of the strip groove 2001 matches the protrusion 2006, which first restricts the limiting ball 1209 from moving in a specific direction inside the spherical insulator 1204.

[0051] After the insulating rod 1207 reaches the corner, as the operation continues, the operator manually rotates the second connecting block 2004 via the damping shaft 2003 connected to the handle 2002. This second connecting block 2004 is fixedly connected to the limiting ball 1209. At this time, the long side of the strip groove 2001 coincides with and is parallel to the second strip hole 19. Under the guidance of the strip groove 2001, the limiting ball 1209 is forced to change its axis of rotation or direction inside the spherical insulator 1204, thereby achieving an "L"-shaped turn.

[0052] The presence of the damping pivot 2003 means that the operation will be smoother and more controllable, avoiding the rapid or unexpected movements of the handle 2002.

[0053] Working Principle: First, under normal operating conditions, the frequency converter cabinet starts running. At this time, the lifting cabinet 5 is raised to the preset height of the top cabinet 2 by the lifting drive component 6 (including drive motor 601, guide rail 602, gear disc 603, and gear chain 604), placing the lifting cabinet 5 with copper busbars installed at the top of the cabinet. It is horizontally offset from the mounting plate 4 and its frequency converter, reactor, and other components in the bottom cabinet 1 to avoid physical interference. The output end of the drive motor 601 drives the gear disc 603 to rotate, and the gear chain 604 pulls the slider on the back of the lifting cabinet 5 to rise smoothly along the guide rail 602, ensuring that the copper busbars are away from the operating area and reducing the risk of personnel accidentally touching high voltage. At the same time, the physical separation of the high-voltage copper busbars and the low-voltage control components (such as the frequency converter) suppresses electromagnetic interference and improves the stability of equipment operation and the reliability of network communication. Spatially, four storage spaces are separated between the bottom cabinet 1 and the top cabinet 2 by a cross-shaped beam 3, optimizing the vertical and horizontal layout and making the overall structure compact without sacrificing functionality.

[0054] Then, when copper busbar inspection or maintenance is required, the operator activates the lowering mechanism. First, the lifting drive 6 responds to the command, the drive motor 601 rotates in the opposite direction, and the gear disc 603 drives the gear chain 604 to move downward, pushing the lifting cabinet 5 smoothly down along the guide rail 602. During the descent, the lower limit bar 7 and lower stop block 8, which are fixedly installed directly below the four corners of the lifting cabinet 5, provide physical restraint: once the bottom of the lifting cabinet 5 contacts the lower stop block 8, the descent is immediately forced to stop, ensuring that the height is controlled within a safe range. Subsequently, the copper busbar is lowered to a safe position inside the bottom cabinet 1, maintaining lateral misalignment with the mounting plate 4 assembly, creating an independent operating space for inspection and reducing maintenance downtime.

[0055] Subsequently, before opening cabinet door 10 for maintenance, the safety system automatically intervenes to ensure a "zero-energy" state. First, when cabinet door 10 is attempted to be opened via hinge shaft 11, the trigger rod 1202 rotates with the shaft, driving the limiting ball 1209 to rotate within the cavity of the spherical insulator 1204 via the linkage 16, including the L-shaped first connecting block 1601 and the limiting post 1602. The limiting ball 1209 drives the insulating rod 1207 to move along the first strip hole 1206, causing the outer spherical conductive block 1208 to disengage from the first conductor 1203, cutting off the current path; the circuit breaker 9 immediately disconnects the main power input, achieving a mechanical forced power-off. Then, the high-impedance dynamic equalization discharge unit 15 automatically starts, rapidly and controllably discharging the internal DC bus capacitor to eliminate the risk of residual charge. The multi-point fiber optic isolation voltage detection module monitors the voltage of key nodes inside the cabinet in real time. When the voltage at all points drops to a preset safety threshold (e.g., below 50V) and stabilizes, the multi-color safety status indicator 13 (red indicates danger, yellow indicates discharge, and green indicates safety) and the digital display screen 14 on the outside of the top cabinet 2 display "Safe and ready for maintenance". During this process, the electromagnetic interlock device keeps the cabinet door 10 locked to prevent accidental opening; only after the voltage reaches the standard is the interlock released, allowing maintenance personnel to enter safely.

[0056] Next, during maintenance, if the lifting drive 6 requires power to operate the lifting cabinet 5, the linkage mechanism of Embodiment 3 comes into play. First, after the cabinet door 10 is fully opened, the insulating rod 1207 has moved to the "L"-shaped intersection of the first strip hole 1206 and the second strip hole 19. Subsequently, the operator manually drives the mounting component 20, guiding the limiting ball 1209 to turn through the strip groove 2001 and the protrusion 2006, pushing the insulating rod 1207 to move horizontally along the second strip hole 19, and finally establishing an electrical connection with the second conductor 17. This allows the external power supply to power the drive motor 601 through the second spring wire 18, driving the lifting drive 6 to work, eliminating the need for a separate external power supply line, simplifying wiring and improving reliability. The damping shaft 2003 ensures smooth operation and avoids malfunctions.

[0057] Finally, after maintenance, the system returns to its initial state. First, manually reverse the mounting component 20 to return the insulating rod 1207 to its original position in the first slot 1206, disconnecting the second conductor 17. Then, when the cabinet door 10 is closed, the trigger rod 1202 resets, the conductive block 1208 re-contacts the first conductor 1203, and the circuit breaker 9 is energized again. The lifting cabinet 5 rises to its high position under the forward rotation of the drive motor 601, and the entire frequency converter cabinet returns to operating mode. This process ensures safe and efficient operation throughout the entire cycle through multiple layers of physical and electrical interlocks.

[0058] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An electrical frequency conversion cabinet, characterized in that, It includes a base cabinet (1), a top cabinet (2), a cross-shaped beam (3), and a lifting cabinet (5); the top of the base cabinet (1) is connected to the bottom of the top cabinet (2) and is divided into four storage spaces by the cross-shaped beam (3); a mounting plate (4) for installing frequency converters, reactors, and filter components is fixedly installed inside the base cabinet (1); a lifting cabinet (5) is provided inside the top cabinet (2), and the lifting cabinet (5) is driven to rise and fall by a lifting drive component (6), and the lifting cabinet (5) and the mounting plate (4) are staggered in the horizontal projection direction; The lower limit rod (7) is fixedly installed inside the base cabinet (1). The lower limit rod (7) has four lower blocks (8) on its top. The lower blocks (8) are located directly below the four corners of the lifting cabinet (5) and contact the outer wall of the lifting cabinet (5) to limit the lowering limit position. The lifting drive component (6) includes a drive motor (601), a guide rail (602), and a gear chain (604) transmission assembly; the guide rail (602) is symmetrically arranged on the inner wall of the top cabinet (2), and the back of the lifting cabinet (5) is slidably connected to the guide rail (602) via a slider; the output end of the drive motor (601) is connected to a gear disc (603), the gear disc (603) meshes with and drives the gear chain (604) to move, and the end of the gear chain (604) is connected to the center position of the back of the lifting cabinet (5); The bottom cabinet (1) is provided with a cabinet door (10) on its side wall. The rotating shaft of the cabinet door (10) is electrically connected to the circuit breaker (9) through a mechanical chain breaking locking mechanism (12). The mechanical chain breaking locking mechanism (12) includes an insulating box (1201), an actuating rod (1202), a spherical insulator (1204), and a conductive block (1208). The actuating rod (1202) drives the insulating rod (1207) to move along the first strip hole (1206) as the cabinet door (10) rotates to break the contact between the conductive block (1208) and the first conductive body (1203). The mechanical chain breaking locking mechanism (12) further includes a first connecting block (1601), a rotating rod (1603), and a rotating block (1604); the radial surface of the rotating block (1604) is provided with a limiting hole (1605) that cooperates with the limiting post (1602) at the end of the trigger rod (1202); the rotating rod (1603) passes through the center of the spherical insulator (1204) and drives the first connecting block (1601) to rotate so as to move the insulating rod (1207).

2. The electrical variable frequency cabinet of claim 1, wherein, The bottom cabinet (1) is equipped with a high-impedance dynamic equalization discharge unit (15) and a multi-point fiber optic isolation voltage detection module; the high-impedance dynamic equalization discharge unit (15) is electrically connected to the DC bus capacitor, and the voltage detection module displays the safety status through the multi-color safety status indicator (13) outside the top cabinet (2).

3. The electrical variable frequency cabinet of claim 2, wherein, The top cabinet (2) is equipped with a digital display screen (14) on the outside, and an electromagnetic interlock device is provided on the cabinet door (10). The digital display screen (14) is connected to the voltage detection module signal. The multi-color safety status indicator (13) includes red, yellow and green markings. The electromagnetic interlock device locks or releases the cabinet door (10) in response to the voltage detection module signal.

4. The electrical variable frequency cabinet of claim 1, wherein, The insulating box (1201) is provided with a second conductor (17), which is connected to the power supply of the drive motor (601) through a second spring wire (18); the spherical insulator (1204) is provided with a second strip hole (19) and forms an L-shaped path with the first strip hole (1206); the insulating rod (1207) can move along the L-shaped path to the second conductor (17) to establish an electrical connection.

5. The electrical variable frequency cabinet of claim 4, wherein, The inner end of the insulating rod (1207) is connected to a limiting ball (1209), and the surface of the limiting ball (1209) is provided with a strip groove (2001). The outside of the insulating box (1201) is provided with a handle (2002) and a damping shaft (2003). The handle (2002) drives the limiting ball (1209) to turn through the second connecting block (2004) to guide the insulating rod (1207) to move along the second strip hole (19).

6. The electrical variable frequency cabinet of claim 1, wherein, The cross-shaped beam (3) is made of two mutually perpendicular I-beams welded together, and the lifting cabinet (5) is provided with anti-collision buffer pads at the four corners.

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