Power-Down Electrical Locking for Explosion Protection Frequency Converter
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Solution Overview
Problem
Existing converter products for coal mines rely on pure mechanical locking structures, requiring manual calculation of safe discharge time and control, leading to instability and reliability issues in safety and device control during the cover opening process.
Innovation Solution
A power-down electrical locking protection device for underground explosion-proof converter cabinets, featuring a steering control part with a steering lever, sector plate, and isolated steering switch, and a locking control part with a locking button, positioning plate, and auxiliary control point, connected via a PLC module and discharge resistors, eliminating the need for manual discharge time calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a pure mechanical locking structure is used, then the device complexity is reduced, but the reliability and stability of safety control deteriorate due to manual calculation and control requirements
Solution Approach 1:
The patent replaces the pure mechanical locking structure with an electrical locking control system that uses electrical signals to control the locking and unlocking of the cabinet door. The PLC module receives signals from the steering switch and controls the locking motor, substituting manual mechanical operations with automated electrical control to improve reliability while maintaining operational simplicity
Solution Approach 2:
The system implements self-service through automatic discharge time calculation and control. The PLC module automatically calculates the required discharge time based on system parameters and controls the discharge process without requiring manual intervention, thereby improving safety control reliability while reducing operational complexity
2Device complexity
If manual calculation of discharge time is required, then the device complexity is reduced, but the productivity and response rate deteriorate due to manual intervention
Solution Approach 1:
The patent substitutes manual calculation and control with an automated electrical system. The PLC module automatically calculates discharge time based on system parameters and controls the locking motor and discharge process, eliminating manual intervention and significantly improving the response rate for cover opening operations
Solution Approach 2:
The system incorporates feedback mechanisms where the PLC module continuously monitors system state and adjusts the discharge process accordingly. The steering switch provides input signals that are processed by the PLC, which then provides appropriate control signals to the locking motor, creating a closed-loop control system that improves both productivity and response rate
3Ease of operation
If manual control of cover opening process is used, then the ease of operation is improved, but the stability and reliability of the product deteriorate
Solution Approach 1:
The patent replaces manual control operations with an automated electrical control system. The steering switch and PLC module work together to automatically control the locking motor and discharge process, maintaining ease of operation through simple switch activation while dramatically improving product stability and reliability through automated control
Solution Approach 2:
The PLC module serves as an intermediary between the simple steering switch input and the complex locking motor control. It processes the operator's simple input signal and translates it into precise control signals for the motor, maintaining ease of operation while ensuring stable and reliable automated control of the cover opening process
Data Source
AI summary
A power-down electrical locking protection device for an underground explosion protection frequency converter comprises a reversing control part and a locking control part. The reversing control part comprises a reversing handle (1), a sector plate (2) of a reversing switch, and an isolated reversing switch (3). The locking control part comprises a locking button (4), a locking positioning plate (5), and an auxiliary control point (6). The reversing handle (1) is fixedly connected to the sector plate (2). The reversing handle (1) is connected to the isolated reversing switch (3). The locking button (4) is fixedly connected to the locking positioning plate (5). The locking button (4) is connected to the auxiliary control point (6). A positioning stud (7) is fixed outside a cupboard door (8). The locking button (4) is electrically connected to a PLC module and a power supply. The isolated reversing switch (3) is connected to a discharge resistor. The power-down electrical locking protection device for an underground explosion protection frequency converter has the following advantages: the discharge time does not need to be calculated manually and the usage is stable and safe.