Mining explosion-proof electromagnetic starter
By introducing 32-bit computer technology and fully digital AC direct sampling into mining explosion-proof electromagnetic starters, the protection function and measurement accuracy are enhanced, the overload protection errors and lack of insulation detection problems of existing starters are solved, remote control and local interaction are realized, and the reliability and intelligence level of the equipment are improved.
Patent Information
- Application Number
- CN202422692114.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-04
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2034-11-04
AI Technical Summary
Existing explosion-proof electromagnetic starters for mining have large overload protection errors, lack motor insulation detection functions, cannot be remotely set parameters, and have unstable power supply conditions, resulting in insufficient functionality and reliability.
Adopting 32-bit computer technology and combining with full digital AC direct sampling, it is equipped with signal processing module, insulation detection module, 485 communication module, operation key module, LCD display and power conversion circuit to enhance the protection function. It has short circuit protection, overload protection, phase failure protection, unbalance protection, leakage lockout, undervoltage/overvoltage protection and self-diagnosis functions to realize remote telemetry and remote control.
It improves the measurement accuracy and operational safety of the starter, has complete protection functions, supports remote control and local human-computer interaction, simplifies parameter setting and troubleshooting, and improves the intelligence level of the equipment.
Smart Images
Figure CN223428365U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of starters, in particular to an explosion-proof electromagnetic starter for mining. Background Art
[0002] With the accelerated automation of coal mines, explosion-proof electromagnetic starters for mines have become one of the primary motor starting devices. Electromagnetic starters utilize electromagnetic principles to control mechanical start and stop operations. They are widely used in various motor starting control applications, primarily to control and protect motors. However, the unstable power supply and variability of downstream motor loads have placed new demands on the functionality and reliability of electromagnetic starters.
[0003] However, existing electromagnetic starters have shortcomings such as large overload protection errors, lack of motor insulation detection function, and inability to remotely set parameters according to on-site conditions.
[0004] Therefore, how to realize a reliable explosion-proof electromagnetic starter for mining is a technical problem to be solved urgently in this field. Summary of the Invention
[0005] In order to solve the above technical problems, the present invention proposes the following technical solutions:
[0006] In the first aspect, an embodiment of the utility model provides an explosion-proof electromagnetic starter for mining, comprising: a starter body and a remote controller, the starter body comprising an isolating reversing switch electrically connected to a three-phase power input terminal, the output end of the isolating reversing switch being electrically connected to the input end of a vacuum contactor and the input end of an isolation transformer, respectively, the output end of the isolation transformer being electrically connected to a first end of an intermediate relay and an input end of a protector, respectively, the second end of the intermediate relay being electrically connected to a remote controller, the output end of the vacuum contactor being electrically connected to the input end of a three-phase current transformer, and the output end of the three-phase current transformer being electrically connected to a motor.
[0007] In one possible implementation, the upper end of the primary coil of the isolation transformer is electrically connected to the first terminal of the three-phase power supply through a first fuse, and the lower end of the primary coil of the isolation transformer is electrically connected to the second terminal of the three-phase power supply; the upper end of the secondary coil of the isolation transformer is electrically connected to the first end of the intermediate relay and the input end of the protector, respectively.
[0008] In a possible implementation, the IA terminal, the IB terminal, the IC terminal and the GND terminal of the protector are electrically connected with the IA terminal, the IB terminal, the IC terminal and the GND terminal of the three-phase current transformer, the leakage detection terminal of the protector is electrically connected with the vacuum contactor, the methane+ terminal, the methane signal terminal and the methane- terminal of the protector are electrically connected with the methane sensor, and the protection terminal of the protector is electrically connected with the explosion-proof double-press switch and the explosion-proof emergency stop switch respectively.
[0009] In a possible implementation, the protector comprises a microcontroller and a signal processing module, an insulation detection module, a 485 communication module, an operation key module, a liquid crystal display screen, a peripheral voltage detection circuit and a power conversion circuit electrically connected with the microcontroller.
[0010] The signal processing module is configured to convert an alternating current signal into a direct current voltage signal recognizable by the microcontroller and input the direct current voltage signal into the microcontroller.
[0011] The insulation detection module is configured to exclude motor self-failure and avoid short circuit during power-on.
[0012] The 485 communication module is configured to realize mutual conversion between a differential signal and a direct current signal.
[0013] The operation key module is configured to set functions and parameters.
[0014] The liquid crystal display screen is configured to display an output signal.
[0015] The peripheral voltage detection circuit is configured to protect the circuit from voltage abnormality.
[0016] The power conversion circuit is configured to convert a power supply.
[0017] In a possible implementation, the starter body further comprises a resistance-capacitance protector arranged between the current transformer and the motor, the resistance-capacitance protector comprises a first resistor, a first end of the first resistor is electrically connected with a first output end of the current transformer, a second end of the first resistor is electrically connected with a first end of a first capacitor, a second end of the first capacitor is electrically connected with a first end of a second capacitor and a first end of a third capacitor respectively, a second end of the second capacitor is electrically connected with a first end of a second resistor, a second end of the second resistor is electrically connected with a second output end of the current transformer, a second end of the third capacitor is electrically connected with a first end of a third resistor, and a second end of the third resistor is electrically connected with a third output end of the current transformer.
[0018] In a possible implementation, the microcontroller adopts an STMF3 single-chip microcomputer.
[0019] In a possible implementation, the isolation transformer is a transformer with a primary coil and an intermediate tap.
[0020] Compared with the prior art, the beneficial effects of the present invention are:
[0021] This utility model utilizes 32-bit computer technology and fully digital AC direct sampling, offering comprehensive protection functions, high sensitivity, reliability, and measurement accuracy. It features short-circuit protection, overload protection, phase loss protection / unbalance protection, leakage lockout, undervoltage / overvoltage protection, and comprehensive self-diagnosis. It can also achieve motor commutation via switching in the event of a power outage, improving operational safety.
[0022] The utility model can realize remote telemetry and remote control, has a liquid crystal display and operation buttons, facilitates local human-computer interaction, information viewing, parameter setting and fault troubleshooting, and provides equipment intelligence. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 A schematic structural diagram of a mining explosion-proof electromagnetic starter provided in an embodiment of the present utility model;
[0024] Figure 2 An electrical schematic diagram of a protector provided in an embodiment of the present utility model;
[0025] Figure 3 This is a schematic structural diagram of a protector provided in an embodiment of the present utility model. DETAILED DESCRIPTION
[0026] The present invention will be described below with reference to the accompanying drawings and specific implementation methods.
[0027] Figure 1 A schematic diagram of the structure of a mine explosion-proof electromagnetic starter provided by the embodiment of the utility model is shown in FIG. Figure 1 In this embodiment, a mining electromagnetic starter includes: a starter body and a remote controller, wherein the starter body includes an isolation reversing switch GHK, a vacuum contactor, an isolation transformer, an intermediate relay, a protector, a three-phase current transformer, a resistor-capacitor protector, and a motor. In this embodiment, the input end of the isolation reversing switch is electrically connected to the three-phase power input terminal, the output end of the isolation reversing switch is electrically connected to the input end of the vacuum contactor and the input end of the isolation transformer, the output end of the isolation transformer is electrically connected to the first end of the intermediate relay and the input end of the protector, the second end of the intermediate relay is electrically connected to the remote controller, the output end of the vacuum contactor is electrically connected to the input end of the three-phase current transformer, and the output end of the three-phase current transformer is electrically connected to the motor.
[0028] In this embodiment, the isolation transformer adopts a transformer with an intermediate tap on the primary coil. The upper end of the primary coil of the isolation transformer is electrically connected to the first terminal of the three-phase power supply through a first fuse, the lower end of the primary coil of the isolation transformer is electrically connected to the second terminal of the three-phase power supply, and the upper end of the secondary coil of the isolation transformer is electrically connected to the first end of the intermediate relay and the input end of the protector respectively.
[0029] See further Figure 1 The RC protector in this embodiment is arranged between the current transformer and the motor for surge protection, and includes a first resistor R1, a first end of the first resistor R1 electrically connected to the first output end of the current transformer, a second end of the first resistor R1 electrically connected to the first end of the first capacitor C1, a second end of the first capacitor C1 electrically connected to the first end of the second capacitor C2 and the first end of the third capacitor C3 respectively, a second end of the second capacitor C2 electrically connected to the first end of the second resistor R2, a second end of the second resistor R2 electrically connected to the second output end of the current transformer, a second end of the third capacitor C3 electrically connected to the first end of the third resistor R3, and a second end of the third resistor R3 electrically connected to the third output end of the current transformer.
[0030] See also Figure 2 , the electrical schematic diagram of the protector provided in an embodiment of the present application, in which the IA terminal, IB terminal, IC terminal and GND terminal of the protector in this embodiment are electrically connected to the IA terminal, IB terminal, IC terminal and GND terminal of the three-phase current transformer, the leakage detection terminal of the protector is electrically connected to the vacuum contactor, the methane + terminal, methane signal terminal and methane - terminal of the protector are all electrically connected to the methane sensor, and the protection terminals of the protector are electrically connected to the explosion-proof double-press switch and the explosion-proof emergency stop switch respectively.
[0031] See also Figure 3 In this embodiment, the protector includes a microcontroller and a signal processing module electrically connected to the microcontroller, an insulation detection module, a 485 communication module, an operation button module, a liquid crystal display, a peripheral voltage detection circuit and a power conversion circuit. Among them, the microcontroller adopts an STMF3 single-chip microcomputer, and the signal processing module is used to convert the AC signal into a DC voltage signal that can be recognized by the microcontroller and input it into the microcontroller. The insulation detection module can detect the insulation resistance between the motor coils, eliminate the motor's own faults before the motor is powered on, and avoid short-circuit faults when powered on. The 485 communication module is used to realize the mutual conversion between differential signals and DC signals. The operation button module is used to set functions and parameters. The liquid crystal display is used to convert the output signal of the microcontroller into text or graphics for display. The peripheral voltage detection circuit adopts the existing voltage detection circuit to protect the circuit from voltage abnormalities. The power conversion circuit adopts the existing power conversion circuit to convert the power supply.
[0032] In this embodiment, the isolation commutating switch is closed before starting, the isolation transformer provides AC 15V, 36V output power, the protector works normally, and the leakage locking detection is carried out, if the leakage detection of the main circuit load side is normal, the normally open contact is closed, and the starting is prepared. When starting, the intermediate relay is attracted by pressing the near control starting button or the remote control starting button, then the contact of the intermediate relay drives the vacuum contactor to be attracted, the main circuit is connected, the auxiliary normally open contact of the vacuum contactor is closed for self-protection, and the connection of the main control circuit is maintained. During the starting process, the leakage detection circuit of the main circuit load side is disconnected in advance before the vacuum contactor is attracted, so that the voltage of the main circuit cannot be connected to the protector. When stopping, the near control stopping button or the remote control stopping button is pressed, and the action process is opposite to the starting process.
[0033] It should be noted that, in the present document, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.
[0034] The above description is merely a specific implementation of the present application. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered by the protection scope of the present application. The protection scope of the present application should be subject to the protection scope of the claims.
Claims
1. A mining explosion-proof electromagnetic starter, characterized in that: include: A starter body and a remote controller, wherein the starter body includes an isolating reversing switch electrically connected to the three-phase power input terminal, the output end of the isolating reversing switch is electrically connected to the input end of the vacuum contactor and the input end of the isolation transformer, respectively, the output end of the isolation transformer is electrically connected to the first end of the intermediate relay and the input end of the protector, the second end of the intermediate relay is electrically connected to the remote controller, the output end of the vacuum contactor is electrically connected to the input end of the three-phase current transformer, and the output end of the three-phase current transformer is electrically connected to the motor.
2. The explosion-proof electromagnetic starter for mining according to claim 1, characterized in that: include: The upper end of the primary coil of the isolation transformer is electrically connected to the first terminal of the three-phase power supply through the first fuse, and the lower end of the primary coil of the isolation transformer is electrically connected to the second terminal of the three-phase power supply; the upper end of the secondary coil of the isolation transformer is electrically connected to the first end of the intermediate relay and the input end of the protector respectively.
3. The explosion-proof electromagnetic starter for mining according to claim 2, characterized in that: The IA terminal, IB terminal, IC terminal and GND terminal of the protector are electrically connected to the IA terminal, IB terminal, IC terminal and GND terminal of the three-phase current transformer respectively, the leakage detection terminal of the protector is electrically connected to the vacuum contactor, the methane + terminal, methane signal terminal and methane - terminal of the protector are all electrically connected to the methane sensor, and the protection terminals of the protector are respectively electrically connected to the explosion-proof double-press switch and the explosion-proof emergency stop switch.
4. The explosion-proof electromagnetic starter for mining according to claim 3, characterized in that: The protector includes a microcontroller and a signal processing module electrically connected to the microcontroller, an insulation detection module, a 485 communication module, an operation button module, a liquid crystal display, a peripheral voltage detection circuit and a power conversion circuit; The signal processing module is used to convert the AC signal into a DC voltage signal that can be recognized by the microcontroller and input it into the microcontroller; The insulation detection module is used to eliminate motor faults and avoid short circuits when powered on; The 485 communication module is used to realize the mutual conversion between differential signals and DC signals; The operation button module is used to set functions and parameters; The liquid crystal display screen is used to display the output signal; The peripheral voltage detection circuit is used to protect the circuit from voltage anomalies; The power conversion circuit is used to convert the power supply.
5. The explosion-proof electromagnetic starter for mining according to claim 1, characterized in that: The starter body also includes a resistor-capacitor protector, which is arranged between the current transformer and the motor. The resistor-capacitor protector includes a first resistor, a first end of the first resistor is electrically connected to the first output end of the current transformer, a second end of the first resistor is electrically connected to the first end of the first capacitor, a second end of the first capacitor is electrically connected to the first end of the second capacitor and the first end of the third capacitor, respectively, a second end of the second capacitor is electrically connected to the first end of the second resistor, a second end of the second resistor is electrically connected to the second output end of the current transformer, a second end of the third capacitor is electrically connected to the first end of the third resistor, and a second end of the third resistor is electrically connected to the third output end of the current transformer.
6. The explosion-proof electromagnetic starter for mining according to claim 4, characterized in that: The microcontroller adopts STMF3 single chip microcomputer.
7. The explosion-proof electromagnetic starter for mining according to claim 2, characterized in that: The isolation transformer adopts a transformer with a primary coil and a middle tap.