An intrinsically safe isolated remote control panel

Abstract

The utility model relates to remote control board technical field especially, it is a kind of intrinsic safety isolation type remote control board, including power supply end, transformer primary side is connected after transformer primary protection in the power supply end, transformer passes through electromagnetic induction output main loop, remote control loop two-way voltage, wherein, remote control loop is connected after half-wave rectification equipment external control button, still install safety protection and current-limiting unit on the remote control loop, there is the capacitor through the charge and discharge stability coil both ends voltage, parallel pressure relief diode in the side of isolation relay.The utility model is through setting transformer primary fuse, safety protection and current-limiting unit and parallel protection components such as pressure relief diode, can effectively guarantee the safe operation of circuit under overcurrent, voltage abnormality etc., improves the security and reliability of overall circuit, satisfies the intrinsic safety requirement of explosive environment such as coal mine underground.

Description

Technical Field

[0001] This utility model relates to the field of remote control board technology, and in particular to an intrinsically safe isolated remote control board. Background Technology

[0002] In underground mining operations such as coal and metal mines, the operating environment for mining electrical equipment is filled with flammable and explosive gases and dust, thus requiring extremely stringent explosion-proof requirements. For intrinsically safe circuits, the safe values ​​of voltage and current are strictly limited, which generally restricts the power of intrinsically safe equipment.

[0003] Taking the explosion-proof and intrinsically safe multi-circuit vacuum electromagnetic starter for mining as an example, its remote control circuit must also meet intrinsic safety requirements to ensure that when a metal open circuit fault occurs in the wires of the remote control circuit, the resulting spark energy is insufficient to ignite the gas, thereby ensuring the safety of underground operations.

[0004] Traditional mining remote control boards typically have many shortcomings: First, during long-distance signal transmission, the current is not effectively limited and isolated, making the signal susceptible to interference. This results in unstable control signals and makes it impossible to reliably control the start and stop of explosion-proof electrical equipment remotely.

[0005] Second, the circuit does not fully consider inherent safety performance. When the remote control circuit malfunctions, the generated electrical sparks may exceed the safety threshold, posing a safety hazard of igniting gas.

[0006] Third, the lack of a sound isolation and protection mechanism results in poor electrical isolation between the remote control board and the main circuit, which can easily lead to mutual influence of electrical faults and reduce the stability and reliability of the entire system.

[0007] With the increasing automation of underground mining operations, more stringent requirements have been placed on the long-distance remote control and intrinsic safety performance of explosion-proof electrical equipment.

[0008] Clearly, existing remote control boards are no longer sufficient to meet practical needs. Therefore, designing an intrinsically safe isolated remote control board that can reliably achieve remote control, meet intrinsic safety requirements, and provide a stable and reliable remote control circuit for downhole magnetic starters has significant practical significance and application value. Utility Model Content

[0009] To solve one of the above-mentioned technical problems, the present invention adopts the following technical solution: an intrinsically safe isolated remote control board. The circuit of the intrinsically safe isolated remote control board includes a power supply terminal. After the transformer is protected by a primary fuse at the power supply terminal, it is connected to the primary side of the transformer. The transformer outputs two voltages, a main circuit and a remote control circuit, through electromagnetic induction. The remote control circuit is connected to the external control button of the device after half-wave rectification. A safety protection and current limiting unit is also installed on the remote control circuit. The current limited by the safety protection and current limiting unit flows into the coil of the isolation relay and causes its normally open contact to close. A capacitor that stabilizes the voltage across the coil through charging and discharging and a voltage relief diode are connected in parallel on one side of the isolation relay. The power supply is shunted through the normally open contact of the isolation relay and flows to one end of the coil of the signal output relay and the self-locking relay, respectively.

[0010] Based on any of the above technical solutions, a further optimization is made: the parallel-connected voltage relief diodes have two paths.

[0011] Based on any of the above technical solutions, a further optimization is made: the safety protection and current limiting unit includes a fuse and a current limiting resistor installed in series on the remote control circuit.

[0012] Based on any of the above technical solutions, a further optimization is made: the external control buttons of the equipment include a trip button and a close button.

[0013] Based on any of the above technical solutions, a further optimization is made as follows: the current flowing through the signal output relay and the self-locking relay flows out from the other end of their respective coils and is connected to the common terminal of the circuit, so that the coils of the signal output relay and the self-locking relay are energized and engaged.

[0014] Based on any of the above technical solutions, the following optimizations are made: After the signal output relay is energized, its contacts close, outputting control signals to the outside and used to control the start and stop of mining equipment; the self-locking relay has its normally open contacts closed and connected in parallel across the two ends of the external closing button to form a self-locking circuit. Even if the external closing button is opened, its contacts remain closed and continuously supply power to the coils of the isolation relay and the signal output relay.

[0015] Based on any of the above technical solutions, a further optimization is made: the normally open contact of the self-locking relay is connected in parallel to both ends of the closing button of the external control button of the equipment.

[0016] Based on any of the above technical solutions, the following further optimization is made: the main circuit voltage is 36V AC voltage, and the remote control circuit voltage is 15V AC voltage.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model, by setting up a transformer primary fuse, a safety protection and current limiting unit (including fuse and current limiting resistor), and parallel voltage relief diodes and other protective components, can effectively ensure the safe operation of the circuit under overcurrent, abnormal voltage and other conditions, improve the overall circuit safety and reliability, and meet the inherent safety requirements of explosive environments such as underground coal mines.

[0018] 2. In this utility model, the capacitor connected in parallel on one side of the isolation relay can stabilize the voltage across the coil. The normally open contact of the self-locking relay is connected in parallel across the two ends of the external closing button to form a self-locking circuit. Even if the external closing button is disconnected, power can still be supplied continuously, ensuring the stability of the circuit operation and the continuity of equipment operation, and reducing equipment abnormalities caused by voltage fluctuations or button operation problems.

[0019] 3. This utility model uses opening and closing buttons as external control buttons for the equipment, and together with components such as isolation relays, signal output relays and self-locking relays, it realizes precise control of the start and stop of mining equipment. The operation logic is clear, the response is accurate, and it is convenient for operators to remotely control the equipment, thus improving the convenience and accuracy of control.

[0020] 4. The overall circuit structure of this utility model is reasonably designed. It uses common components such as transformers, relays, resistors, and capacitors, and achieves the required functions through a simple and effective connection method. It does not require complex electronic circuits, which reduces the complexity of the circuit and production costs. It is also easy to install and maintain on site, making it suitable for promotion and application in industrial sites. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, the elements or components are not necessarily drawn to scale.

[0022] Figure 1 This is the circuit diagram of this utility model.

[0023] In the diagram, Um is the power supply terminal; FU1 is the transformer primary fuse; T is the transformer; F1 is the fuse; R2 is the current-limiting resistor; C2 is the capacitor; VD1 is the voltage relief diode; K1 is the isolation relay; K2 is the signal output relay; K3 is the self-locking relay; K3' is the normally open contact of the self-locking relay; A is the external control button; SB1 is the closing button; and SB2 is the opening button. Detailed Implementation

[0024] The embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of the present utility model, and are therefore merely examples and should not be construed as limiting the scope of protection of the present utility model. The specific structure of the present utility model is as follows: Figure 1 As shown in the image.

[0025] Example 1: An intrinsically safe isolated remote control board. The circuit of the intrinsically safe isolated remote control board includes a power supply terminal. After the transformer is protected by a primary fuse at the power supply terminal, it is connected to the primary side of the transformer. The transformer outputs two voltages, a main circuit and a remote control circuit, through electromagnetic induction. The remote control circuit is connected to the external control button of the device after half-wave rectification. A safety protection and current limiting unit is also installed on the remote control circuit. The current limited by the safety protection and current limiting unit flows into the coil of the isolation relay and causes its normally open contact to close. A capacitor that stabilizes the voltage across the coil through charging and discharging and a voltage relief diode are connected in parallel on one side of the isolation relay.

[0026] The power supply is shunted through the normally open contact of the isolation relay and flows to one end of the coil of the signal output relay and the self-locking relay, respectively.

[0027] The current output from the power supply first passes through the transformer's primary fuse for protection, and then is connected to the transformer's primary side. Utilizing the principle of electromagnetic induction, the transformer outputs two voltage paths: one for the main circuit and one for the remote control circuit, achieving voltage conversion and distribution to provide suitable power for subsequent circuit operations. The voltage in the remote control circuit is half-wave rectified before being connected to the external control buttons on the equipment. Simultaneously, the safety protection and current-limiting units installed on the remote control circuit process the current.

[0028] After being current-limited by this unit, the current flows into the coil of the isolation relay, causing the normally open contacts of the isolation relay to close. During this process, the safety protection and current-limiting unit ensures that the current is within a safe range, ensuring the stable operation of the remote control circuit. The capacitor connected in parallel on one side of the isolation relay stabilizes the voltage across the coil through charging and discharging, reducing the impact of voltage fluctuations on the relay; the parallel-connected voltage relief diode plays a protective role, preventing abnormal voltage from damaging the components.

[0029] The current from the power supply is shunted through the normally open contact of the isolation relay and flows to one end of the coil of the signal output relay and the self-locking relay, thereby controlling the working state of these two relays and realizing the signal output and self-locking function control of related equipment.

[0030] The circuit incorporates a transformer primary fuse and safety protection and current limiting unit, effectively preventing damage from overcurrent and ensuring safe operation. The presence of a voltage relief diode further enhances the circuit's resilience and reduces the probability of component failure. A capacitor stabilizes the voltage across the isolation relay coil, reducing voltage fluctuations and ensuring reliable relay engagement and disengagement, thus guaranteeing circuit stability. Through the coordination of the isolation relay, signal output relay, and self-locking relay, the circuit accurately responds to external control button operations, enabling precise control of related equipment and meeting the control requirements of practical applications.

[0031] Based on any of the above technical solutions, a further optimization is made: the parallel-connected voltage relief diodes have two paths.

[0032] Two voltage-relief diodes are connected in parallel across the coil of the isolation relay, forming a parallel circuit with the coil and capacitor. When the isolation relay coil is de-energized, the coil generates a reverse electromotive force due to its inductive characteristics. At this time, both voltage-relief diodes conduct simultaneously, releasing the reverse electromotive force through the circuit (forming a freewheeling circuit), preventing high voltage from impacting the coil and subsequent components. Simultaneously, if abnormal conditions such as reverse connection of the rectifier diodes occur in the circuit, the two diodes can jointly shunt the reverse current, limiting the voltage peak.

[0033] Based on any of the above technical solutions, a further optimization is made: the safety protection and current limiting unit includes a fuse and a current limiting resistor installed in series on the remote control circuit.

[0034] The fuse and current-limiting resistor are connected in series in the remote control circuit, together forming a safety protection and current-limiting unit. When the remote control circuit is connected, the current is output from the secondary side of the transformer, rectified by half-wave, flows first through the fuse, then through the current-limiting resistor, and finally into the coil of the isolating relay. The function of the fuse is to quickly melt and disconnect the circuit when the current in the circuit exceeds its rated value, preventing excessive current from damaging subsequent components; the current-limiting resistor, through its own resistance characteristics, limits the current in the circuit, keeping the current flowing through the coil of the isolating relay within a safe range, meeting the requirements of intrinsically safe circuits.

[0035] Based on any of the above technical solutions, a further optimization is made: the external control buttons of the equipment include a trip button and a close button.

[0036] The opening and closing buttons serve as input components for external control commands to the equipment, connected to the remote control circuit after half-wave rectification. When the closing button is closed, the remote control circuit is activated, and current flows sequentially through the safety protection and current limiting units (fuse, current limiting resistor) into the coil of the isolation relay, causing the normally open contact of the isolation relay to close. This triggers the signal output relay and the self-locking relay to operate, achieving the start-up control of the mining equipment. When the opening button is closed, the control logic of the remote control circuit is cut off, the coil of the isolation relay is de-energized, its normally open contact opens, and the coils of the signal output relay and the self-locking relay are de-energized, stopping the mining equipment. Through independent switching actions, they correspond to the start and stop commands of the equipment, forming a complete remote control logic closed loop.

[0037] Based on any of the above technical solutions, a further optimization is made as follows: the current flowing through the signal output relay and the self-locking relay flows out from the other end of their respective coils and is connected to the common terminal of the circuit, so that the coils of the signal output relay and the self-locking relay are energized and engaged.

[0038] When the normally open contact of the isolating relay closes, the current from the power supply is shunted through this contact, flowing into one end of the coil of the signal output relay and the other end of the coil of the self-locking relay. Subsequently, the current flowing through the coil of the signal output relay flows out from the other end of its coil, and the current flowing through the coil of the self-locking relay flows out from the other end of its coil. These two currents merge and connect to the common terminal of the circuit, forming a complete current loop. In this loop, the current passes through the coils of the signal output relay and the self-locking relay, causing the coils to generate an electromagnetic effect, which in turn energizes the coils of both relays, triggering their respective contacts to operate and achieve the corresponding function.

[0039] High circuit stability: The current flows from the coils of both relays and connects to the common terminal of the same circuit, ensuring that the power supply circuits of the two relays are independent yet ultimately converge, reducing interference between circuits. This design allows the current to flow stably through the coils, ensuring that the signal output relay and the self-locking relay can be reliably energized and engaged, avoiding abnormal relay operation due to circuit connection problems.

[0040] Example 2: Compared with Example 1, this example also includes the following technical features: Based on any of the above technical solutions, the following optimizations are made: After the signal output relay is energized, its contacts close, outputting control signals to the outside and used to control the start and stop of mining equipment; the self-locking relay has its normally open contacts closed and connected in parallel across the two ends of the external closing button to form a self-locking circuit. Even if the external closing button is opened, its contacts remain closed and continuously supply power to the coils of the isolation relay and the signal output relay.

[0041] The control logic of the signal output relay is as follows: When the normally open contact of the isolation relay closes, the coil of the signal output relay is energized and closes, causing its contacts to close. The closed contacts transmit the control signal to the mining equipment, directly triggering the equipment's start-up action. When the normally open contact of the isolation relay opens (e.g., triggered by a trip button), the coil of the signal output relay is de-energized, its contacts open, the control signal terminates, and the mining equipment stops operating.

[0042] The self-locking mechanism of the self-locking relay: The coil of the self-locking relay is energized synchronously with the coil of the signal output relay. After its normally open contact closes, it is connected in parallel across the external closing button. At this time, even if the external closing button is opened (e.g., the operator releases the button), the closed self-locking relay contact can still maintain the conduction state of the remote control circuit, continuously supplying power to the coils of the isolation relay and the signal output relay, ensuring that both relays remain engaged and the mining equipment continues to operate.

[0043] The signal output relay directly outputs control signals through contact action, realizing physical isolation control of the start and stop of mining equipment and avoiding the risk of interference in electronic signal transmission; the mechanical action characteristics of its contacts ensure the stability of control commands and are suitable for the strong electromagnetic interference environment in underground coal mines.

[0044] Based on any of the above technical solutions, a further optimization is made: the normally open contact of the self-locking relay is connected in parallel to both ends of the closing button of the external control button of the equipment.

[0045] The normally open contact of the self-locking relay is connected in parallel with the closing button of the external control button. When the closing button is closed, the remote control circuit is activated, and current flows through the safety protection and current limiting unit into the coil of the isolation relay, causing the normally open contact of the isolation relay to close. This, in turn, supplies power to the coil of the self-locking relay, causing its normally open contact to close. At this time, even if the closing button is opened (e.g., the operator releases the button), the closed normally open contact of the self-locking relay can still maintain the conduction state of the remote control circuit. Current can continue to flow to the coil of the isolation relay through this contact, ensuring that the isolation relay and signal output relay are continuously energized, and the mining equipment remains operational. When the opening button is closed, the control circuit is cut off, the coil of the self-locking relay is de-energized, its normally open contact opens, and the self-locking state is released.

[0046] Based on any of the above technical solutions, the following further optimization is made: the main circuit voltage is 36V AC voltage, and the remote control circuit voltage is 15V AC voltage.

[0047] The transformer outputs two voltages via electromagnetic induction. The main circuit voltage is 36V AC, providing power to the main circuit section containing the remote control board and ensuring the normal operation of the core components within the main circuit. The remote control circuit voltage is 15V AC, which, after half-wave rectification, is connected to the external control buttons to provide energy for the transmission of remote control commands. The two voltages serve different circuit sections. The main circuit voltage meets the power and voltage requirements of the main circuit, while the remote control circuit voltage is adapted to the operating characteristics of the external control buttons and subsequent current-limiting and isolation components, enabling the entire circuit system to operate in a coordinated manner.

[0048] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model. For those skilled in the art, any alternative improvements or transformations made to the implementation of this utility model fall within the protection scope of this utility model.

[0049] Any aspects of this utility model not described in detail are known to those skilled in the art.

Claims

1. An intrinsically safe isolated remote control board, characterized in that: The circuit of the intrinsically safe isolated remote control board includes a power supply terminal. After the transformer is protected by a primary fuse at the power supply terminal, it is connected to the primary side of the transformer. The transformer outputs two voltages, the main circuit and the remote control circuit, through electromagnetic induction. The remote control circuit is connected to the external control button of the device after half-wave rectification. A safety protection and current limiting unit is also installed on the remote control circuit. The current after being limited by the safety protection and current limiting unit flows into the coil of the isolation relay and causes its normally open contact to close. A capacitor that stabilizes the voltage across the coil through charging and discharging and a voltage relief diode are connected in parallel on one side of the isolation relay. The power supply is shunted through the normally open contact of the isolation relay and flows to one end of the coil of the signal output relay and the self-locking relay, respectively.

2. The intrinsically safe isolated remote control board according to claim 1, characterized in that: in, The parallel-connected voltage relief diodes have two paths.

3. The intrinsically safe isolated remote control board according to claim 2, characterized in that: The safety protection and current limiting unit includes a fuse and a current limiting resistor installed in series on the remote control circuit.

4. The intrinsically safe isolated remote control board according to claim 3, characterized in that: The external control buttons for the equipment include the trip button and the close button.

5. The intrinsically safe isolated remote control board according to claim 4, characterized in that: The current flowing through the signal output relay and the self-locking relay flows out from the other end of their respective coils and is connected to the common terminal of the circuit, which energizes and engages the coils of the signal output relay and the self-locking relay.

6. The intrinsically safe isolated remote control board according to claim 5, characterized in that: After the signal output relay is energized, its contacts close, outputting control signals to control the start and stop of mining equipment; the self-locking relay has its normally open contacts closed and connected in parallel across the two ends of the external closing button to form a self-locking circuit. Even if the external closing button is opened, its contacts remain closed and continuously supply power to the coils of the isolation relay and the signal output relay.

7. The intrinsically safe isolated remote control board according to claim 6, characterized in that: The normally open contact of the self-locking relay is connected in parallel across the closing button of the external control button of the equipment.

8. The intrinsically safe isolated remote control board according to claim 7, characterized in that: in, The main circuit voltage is 36V AC, and the remote control circuit voltage is 15V AC.

Images