RH preheating gun wireless remote control lifting ignition control device and control method thereof

Abstract

The application discloses an RH preheating gun wireless remote control lifting ignition control device and a control method thereof, and belongs to the technical field of steelmaking, and comprises a wireless remote control transmitter, a wireless remote control receiver, a lifting control loop, a high-voltage ignition transformer, a first control relay, a second control relay, an ignition signal indicator lamp and an ascending signal indicator lamp, wherein a wireless remote control system is independently arranged outside a PLC control system, the two systems are redundant backups of each other, when the PLC control is abnormal, the wireless remote control can be used to independently complete the preheating gun lifting and ignition full-process operation, and shutdown maintenance is not needed; and the device has the characteristics of simple structure, parallel installation on the basis of the existing PLC system, low cost and easy popularization.

Description

Technical Field

[0001] This invention relates to the technical field of steelmaking, and in particular to a wireless remote control lifting and ignition control device for an RH preheating gun and its control method. Background Technology

[0002] RH vacuum refining is a crucial process in steelmaking, and the preheating lance is used to preheat the vacuum chamber at high temperatures. Currently, RH preheating lance ignition control generally employs a PLC control system to output ignition control commands. After receiving the PLC command, the preheating lance ignition control device begins to descend, and simultaneously, the high-voltage ignition coil emits a high-voltage pulse. After nitrogen is purged from the pipeline within the preheating lance, coal gas and oxygen are introduced. The mixed gas is ignited upon encountering the high-voltage pulse at the lance muzzle, completing the ignition process.

[0003] However, existing technologies have the following shortcomings: First, the control method is simplistic and lacks redundancy. When the PLC control system malfunctions with an abnormal ignition command (e.g., PLC crash, output module failure, communication interruption), the preheating gun cannot complete the ignition process, necessitating a production halt for maintenance. This causes the RH furnace vacuum chamber to cool down, requiring re-baking before production can resume, disrupting production for several hours and resulting in significant economic losses.

[0004] Secondly, fault diagnosis relies on manual intervention, which is inefficient. When preheating gun ignition malfunctions, individual maintenance personnel cannot independently pinpoint the fault; production staff must operate the HMI screen in the control room to systematically check PLC input / output status, relay logic, power supply circuits, etc., to locate the problem. This approach suffers from drawbacks such as wasted personnel, high communication costs, and long repair times.

[0005] Third, the steelmaking plant has a harsh environment (temperatures are above 40°C year-round, and there is strong electromagnetic interference). Maintenance personnel face health risks from working in high-temperature areas for extended periods, and electromagnetic interference can affect the stable transmission of wireless signals.

[0006] Therefore, there is an urgent need for a technical solution that can independently complete ignition control when PLC control is abnormal and can achieve remote and rapid fault diagnosis. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a wireless remote control lifting and ignition control device and its control method for an RH preheating gun, so as to solve the technical problems of single control mode, lack of redundancy backup, low fault diagnosis efficiency and difficulty in operation in high temperature environment in the prior art.

[0008] To achieve the above objectives, the present invention provides a wireless remote control lifting and ignition control device for an RH preheating gun, comprising: A wireless remote control transmitter is used to transmit coded lifting and ignition control commands. A wireless remote control receiver, wirelessly connected to the wireless remote control transmitter, is used to receive and decode control commands; The lifting control circuit is used to drive the lifting action of the preheating gun; A high-voltage ignition transformer is used to generate a high-voltage pulse to ignite the gas mixture at the preheating gun muzzle; The first control relay has its coil electrically connected to the output terminal of the wireless remote control receiver, and its contact group is respectively connected to the lifting motor control circuit and the high-voltage ignition transformer, and is used to realize the timing control of the preheating gun's descent, ascent and ignition pulse according to the control command. The second control relay has its coil connected in parallel between the first control relay and the high-voltage ignition transformer to achieve linkage. The ignition signal indicator is electrically connected to the contact group of the second control relay and is used to emit a light signal when the ignition is in progress. The rising signal indicator light is electrically connected to the contact group of the second control relay and is used to emit a light signal when the preheating gun rises to the correct position.

[0009] Furthermore, it also includes a wireless signal gain antenna, which is connected to the signal input terminal of the wireless remote control receiver, and is used to enhance the sensitivity of radio frequency signal reception in the electromagnetic interference environment of the steelmaking site.

[0010] Furthermore, the contact group of the first control relay includes: The descent control contact group engages when the first control relay coil is energized, connecting the motor forward rotation circuit in the lifting control circuit to drive the preheating gun to descend. The lifting control contact group is reset and engaged when the first control relay coil is de-energized, connecting the motor reversal circuit in the lifting control circuit to drive the preheating gun to rise. The ignition control contact group engages when the first control relay coil is energized, connecting the primary coil power supply circuit of the high-voltage ignition transformer to generate a high-voltage pulse.

[0011] Furthermore, the contact group of the second control relay includes: The ignition indicator contact group is activated to turn on the ignition signal indicator light when the second control relay coil is energized. The rising indicator contact group resets and engages to activate the rising signal indicator when the second control relay coil is de-energized.

[0012] Furthermore, the ignition signal indicator is a red indicator; the rise signal indicator is a green indicator.

[0013] Furthermore, the wireless remote control receiver, the first control relay coil, and the second control relay coil are powered by DC24V.

[0014] Furthermore, the coil of the high-voltage ignition transformer and the ignition signal indicator and rise signal indicator are powered by AC220V.

[0015] A wireless remote control method for raising, lowering, and igniting an RH preheating gun includes the following control methods: When the preset PLC control system malfunctions and the ignition command is abnormal, the wireless remote control transmitter transmits the coded lifting and ignition control commands. After decoding, the wireless remote control receiver drives the coil of the first control relay to be energized or de-energized, thereby controlling the descent and ascent of the preheating gun and the switching on and off of the high-voltage ignition transformer. At the same time, the second control relay controls the ignition signal indicator and the ascent signal indicator to be turned on and off.

[0016] Furthermore, when the descent and ignition button of the wireless remote transmitter is pressed, the encoded descent and ignition command is transmitted. After decoding, the wireless remote receiver drives the first control relay coil to be energized, controlling the preheating gun to descend and simultaneously connecting the high-voltage ignition transformer to generate a high-voltage pulse to achieve ignition.

[0017] Furthermore, when the ignition stop button on the wireless remote transmitter is pressed, the coded ignition stop command is transmitted, the first control relay coil is de-energized, the high-voltage ignition transformer is de-energized and ignition stops, and at the same time the preheating gun is controlled to rise and return to the standby position.

[0018] The present invention adopts the above-mentioned solution, and its beneficial effects are as follows: 1) An independent wireless remote control system is set up outside the PLC control system, with the two serving as redundant backups for each other. When the PLC ignition command malfunctions, on-site personnel can independently complete the entire process of lowering, igniting, extinguishing, and raising the preheating gun via the wireless remote control, without the need for shutdown maintenance, thus avoiding production interruptions caused by PLC failures. 2) The device has a simple structure and can be added in parallel to the existing PLC system, resulting in low cost and ease of promotion. 3) By setting red ignition signal indicator lights and raising signal indicator lights, maintenance personnel can determine the source of the fault by observing whether the red lights are lit: a lit red light indicates that the ignition device is normal and the PLC is abnormal, allowing for direct wireless remote control ignition to restore production; an unlit red light indicates a faulty ignition device, enabling more intuitive and rapid troubleshooting. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the modular components of the lifting ignition control device.

[0020] Figure 2 This is a schematic diagram of the circuit principle of the lifting ignition control device.

[0021] Among them, 1-wireless remote control transmitter, 2-wireless remote control receiver, 3-lifting control circuit, 4-high voltage ignition transformer, 5-first control relay, 51-lowering control contact group, 52-upper control contact group, 53-ignition control contact group, 6-second control relay, 61-ignition indicator contact group, 62-upper indicator contact group, 7-ignition signal indicator light, 8-upper signal indicator light. Detailed Implementation

[0022] To more fully illustrate the present invention, a detailed description will be provided below in conjunction with the accompanying drawings. The drawings illustrate preferred embodiments of the invention. However, it is worth noting that the present invention is not limited to these specific forms and can be implemented in various ways. These embodiments are provided to enable the reader to gain a deeper understanding of the present invention.

[0023] See appendix Figure 1 and 2 As shown in this embodiment, a wireless remote control lifting and ignition control device for an RH preheating gun includes a wireless remote control transmitter 1, a wireless remote control receiver 2, a lifting control circuit 3, a high-voltage ignition transformer 4, a first control relay 5, a second control relay 6, an ignition signal indicator 7, and an upward signal indicator 8. The wireless remote control transmitter 1 is powered by a DC12V 23Ah dry battery and is equipped with buttons such as "lower ignition" and "extinguish and rise". The corresponding button commands are encoded and encrypted before being transmitted outward via a radio frequency carrier.

[0024] In this embodiment, the wireless remote control receiver 2 is powered by a DC24V industrial control power supply. It has a built-in decoding circuit that can demodulate and decode the received radio frequency signal to restore the original control command. Furthermore, the wireless remote control receiver 2 is built into a pre-designed electrical control cabinet. Its signal input terminal is led out to the outside of the control cabinet via a coaxial cable and connected to a pre-designed wireless signal gain antenna to enhance the sensitivity of radio frequency signal reception in the electromagnetic interference environment of the steelmaking site.

[0025] In this embodiment, the lifting control circuit 3 is used to drive the preheating gun to lift. Specifically, it drives a preset motor (whose drive end is connected to the preheating gun for transmission) to rotate forward and reverse to achieve the lifting action of the preheating gun. The forward rotation of the motor corresponds to the preheating gun descending, and the reverse rotation of the motor corresponds to the preheating gun rising.

[0026] In this embodiment, the high-voltage ignition transformer 4 is used to generate a high-voltage pulse to ignite the gas mixture at the preheating gun nozzle. Specifically, the primary coil of the high-voltage ignition transformer 4 is connected to an AC220V power supply, and the secondary coil outputs an 8kV high-voltage pulse, which is connected to the ignition electrode at the preheating gun nozzle through a high-voltage cable.

[0027] In this embodiment, the first control relay 5 has its coil ends connected to the decoding output terminal (DC24V+) of the wireless remote control receiver 2 and the power ground, respectively. Its contact group is specifically divided into three paths: The descent control contact group 51 includes contacts A5 and A6 (normally open) and contacts A9 and A10 (common terminal, external DC12V power supply, for power supply). When the coil of the first control relay 5 is energized, it is energized (A5 and A6 are energized, A9 and A10 are energized), which connects the motor forward rotation circuit in the lifting control circuit 3 to drive the preheating gun to descend. The lifting control contact group 52 includes contacts A1 and A2 (normally closed) and contacts A9 and A10 (common terminal, connected to an external DC12V power supply, serving as a power supply). When the coil of the first control relay 5 is de-energized, it resets and engages (A1 and A2 engage, A9 and A10 engage), connecting the motor reversal circuit in the lifting control circuit 3 to drive the preheating gun to rise.

[0028] The ignition control contact group 53 includes contacts A7 and A8 (normally open) and contacts A11 and A12 (common terminal, external AC220V). When the coil of the first control relay 5 is energized, it is energized (A7 and A8 are energized, A11 and A12 are energized), which connects the primary coil power supply circuit (AC220V) of the high-voltage ignition transformer 4 to generate a high-voltage pulse in the secondary coil.

[0029] In this embodiment, the second control relay 6 is a multi-contact relay, and its coil is connected in parallel between the first control relay 5 and the high-voltage ignition transformer 4 to achieve linkage (i.e., the second control relay 6 and the first control relay 5 are simultaneously energized or de-energized); its contact group is specifically divided into two paths: The ignition indicator contact group 61 includes contacts B7 and B8 (normally open) and contacts B11 and B12 (common terminal, connected to an external DC24V power supply, serving as a power supply). When the coil of the second control relay 6 is energized, it is energized (B7 and B8 are energized, and B11 and B12 are energized) to turn on the ignition signal indicator 7 (preferably, the ignition signal indicator 7 is a red indicator).

[0030] The rising indicator contact group 62 includes contacts B3 and B4 (normally open) and contacts B11 and B12 (common terminal, external DC24V power supply, for power supply). When the coil of the second control relay 6 is de-energized, it resets and engages (B3 and B4 engage, B11 and B12 engage) to turn on the rising signal indicator 8 (preferably, the rising signal indicator 8 is a green indicator).

[0031] In this embodiment, the ignition signal indicator 7 is electrically connected to the contact group B7 and B8 of the second control relay 6, and is used to emit a light signal when the ignition is in progress; the rise signal indicator 8 is electrically connected to the contact group B3 and B4 of the second control relay 6, and is used to emit a light signal when the preheating gun rises to the correct position.

[0032] In this embodiment, the control device is connected in parallel with the original PLC control system to the same actuator (lifting motor and high-voltage ignition transformer 4). Thus, when the PLC ignition command is abnormal, it can be manually controlled through the wireless remote control transmitter 1 to complete the corresponding control actions of the preheating gun.

[0033] Under normal production conditions, the PLC control system completes the raising, lowering, and ignition control of the preheating gun according to the original program, and the wireless remote control transmitter 1 of this device is in standby mode.

[0034] When the preset PLC control system malfunctions due to an abnormal ignition command (such as PLC crash, output module damage, communication interruption, etc.), the wireless remote control transmitter 1 transmits coded lifting and ignition control commands. The wireless remote control receiver 2 decodes the commands and drives the coil of the first control relay 5 to be energized or de-energized, thereby controlling the descent and ascent of the preheating gun and the switching on and off of the high-voltage ignition transformer 4. At the same time, the second control relay 6 controls the ignition signal indicator 7 and the ascent signal indicator 8 to be on and off.

[0035] Specifically, for descent ignition: The operator stands in a safe area and presses the "Descent Ignition" button on the wireless remote transmitter 1. The transmitter encodes and encrypts this button command and transmits it via radio frequency signal. The wireless remote receiver 2 receives this radio frequency signal through a gain antenna, demodulates and decrypts it to recover the "Descent Ignition" command. The decoder output of the receiver outputs a DC24V voltage, energizing the coil of the first control relay 5. After the first control relay 5 is energized: the descent control contact group 51 closes, the lifting motor rotates forward, and the preheating gun descends; simultaneously, the ignition control contact group 53 closes, energizing the high-voltage ignition transformer 4 to generate an 8kV high-voltage pulse; simultaneously, the coil of the second control relay 6 is energized, its ignition indicator contact group 61 closes, and the red indicator light illuminates. When the preheating gun descends to the lower limit (or the set ignition position), the gas mixture at the nozzle is ignited upon encountering the high-voltage pulse.

[0036] Specifically, for the "Shutdown and Rise" sequence: After successful ignition, the operator presses the "Shutdown and Rise" button on the wireless remote transmitter 1. The transmitter sends out the corresponding coded command. After decoding by the receiver, the coil of the first control relay 5 is de-energized. After the first control relay 5 is de-energized: the rise control contact group 52 resets and engages, the lifting motor reverses, and the preheating gun rises; simultaneously, the ignition control contact group 53 opens, the high-voltage ignition transformer 4 is de-energized, and the high-voltage pulse stops; at the same time, the coil of the second control relay 6 is de-energized, its ignition indicator contact group 61 opens, and the red indicator light goes out; its rise indicator contact group 62 resets and engages, and the green indicator light illuminates, indicating that the preheating gun has risen to the standby position.

[0037] In summary, this device and the PLC control system are two completely independent control loops, and they do not affect each other electrically. Once the PLC returns to normal operation, on-site personnel can turn off the wireless remote control and return control to the PLC without any physical switching operation. Both systems can be in standby mode simultaneously without interfering with each other.

[0038] In this embodiment, after the PLC control system issues an ignition command, if the preset flame detection sensor (not shown in the figure) fails to detect a flame signal within a preset time, an ignition fault is determined and an alarm signal is output. At this time, the operator or maintenance personnel go to the site (or observe the lighting status of the ignition signal indicator 7 (red indicator) through a remote observation window).

[0039] Scenario 1: The red indicator light is not lit. When the red indicator light is not illuminated, the fault is located on the ignition control unit side. Possible causes include: no output from the wireless remote receiver 2, a fault in the power supply circuit of the first control relay 5 coil, poor contact at the contacts, or an open circuit in the power supply circuit of the primary coil of the high-voltage ignition transformer 4. In this case, the fault is unrelated to the PLC control system.

[0040] Scenario 2: The red indicator light is on normally. When the red indicator light is observed to be lit normally (i.e., the red light illuminates after pressing the ignition button), but the flame detection device still reports an ignition fault, it is determined that the source of the fault is on the PLC control system side (such as a damaged PLC output module, an abnormal control program, or an interruption in communication between the PLC and the actuator, etc.), while the wireless remote control ignition device of the present invention itself is working normally.

[0041] In summary, the device of this invention not only provides a backup control method when the PLC malfunctions, but more importantly, it can clearly distinguish the source of the fault into two categories—"ignition device failure" and "PLC control system failure"—based on the status of the indicator lights, allowing for targeted handling measures in each case. For PLC control system failures, wireless remote control can directly ensure continuous production; for ignition device failures, indicator lights assist in rapid location and replacement. In both cases, production personnel do not need to operate the HMI screen in the control room; a single person can complete fault diagnosis and handling, significantly improving maintenance efficiency and production reliability.

[0042] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Any modifications or variations made by those skilled in the art, without departing from the scope of the present invention, using the disclosed technical content, are equivalent embodiments of the present invention. Therefore, all equivalent changes made based on the concept of the present invention without departing from the scope of the present invention should be covered within the protection scope of the present invention.

Claims

1. A wireless remote control lifting and ignition control device for an RH preheating gun, characterized in that, include: Wireless remote control transmitter (1) is used to transmit encoded lifting and ignition control commands; The wireless remote control receiver (2) is wirelessly connected to the wireless remote control transmitter (1) and is used to receive and decode control commands; The lifting control circuit (3) is used to drive the lifting action of the preheating gun; High-voltage ignition transformer (4) is used to generate high-voltage pulses to ignite the gas mixture at the preheating gun muzzle; The first control relay (5) has its coil electrically connected to the output terminal of the wireless remote control receiver (2), and its contact group is connected to the lifting motor control circuit and the high-voltage ignition transformer (4) respectively, for realizing the timing control of the preheating gun's descent, ascent and ignition pulse according to the control command; The second control relay (6) has its coil connected in parallel between the first control relay (5) and the high-voltage ignition transformer (4) to achieve linkage; The ignition signal indicator (7) is electrically connected to the contact group of the second control relay (6) and is used to emit a light signal when the ignition is in progress. The rising signal indicator (8) is electrically connected to the contact group of the second control relay (6) and is used to emit a light signal when the preheating gun rises to the position.

2. The RH preheating gun wireless remote control lifting and ignition control device according to claim 1, characterized in that, It also includes a wireless signal gain antenna, which is connected to the signal input terminal of the wireless remote control receiver (2) to enhance the sensitivity of radio frequency signal reception in the electromagnetic interference environment of the steelmaking site.

3. The RH preheating gun wireless remote control lifting and ignition control device according to claim 1, characterized in that, The contact group of the first control relay (5) includes: The descent control contact group (51) is activated when the coil of the first control relay (5) is energized, which connects the motor forward rotation circuit in the lifting control circuit (3) to drive the preheating gun to descend. The lifting control contact group (52) is reset and engaged when the coil of the first control relay (5) is de-energized, thereby connecting the motor reversal circuit in the lifting control circuit (3) to drive the preheating gun to rise. The ignition control contact group (53) is energized when the coil of the first control relay (5) is energized, connecting the primary coil power supply circuit of the high-voltage ignition transformer (4) to generate a high-voltage pulse.

4. The RH preheating gun wireless remote control lifting and ignition control device according to claim 1, characterized in that, The contact group of the second control relay (6) includes: The ignition indicator contact group (61) is activated when the coil of the second control relay (6) is energized to turn on the ignition signal indicator (7). The rising indicator contact group (62) is reset and engaged when the coil of the second control relay (6) is de-energized to turn on the rising signal indicator (8).

5. The RH preheating gun wireless remote control lifting and ignition control device according to claim 1, characterized in that, The ignition signal indicator (7) is a red indicator; the rise signal indicator (8) is a green indicator.

6. The RH preheating gun wireless remote control lifting and ignition control device according to claim 1, characterized in that: The wireless remote control receiver (2), the coil of the first control relay (5), and the coil of the second control relay (6) are powered by DC24V.

7. The RH preheating gun wireless remote control lifting and ignition control device according to claim 1, characterized in that: The coil of the high-voltage ignition transformer (4) and the ignition signal indicator (7) and rise signal indicator (8) are powered by AC220V.

8. A wireless remote control lifting and ignition control method for an RH preheating gun based on the device described in any one of claims 1 to 7, characterized in that, The following control methods are included: When the preset PLC control system malfunctions and the ignition command is abnormal, the wireless remote control transmitter (1) transmits the encoded lifting and ignition control commands. The wireless remote control receiver (2) decodes the commands and drives the coil of the first control relay (5) to be energized or de-energized, thereby controlling the descent and ascent of the preheating gun and the on / off state of the high-voltage ignition transformer (4). At the same time, the second control relay (6) controls the ignition signal indicator (7) and the ascent signal indicator (8) to be lit and extinguished.

9. A wireless remote control lifting and ignition control method for an RH preheating gun according to claim 8, characterized in that: When the descent ignition button of the wireless remote transmitter (1) is pressed, the coded descent ignition command is transmitted. After the wireless remote receiver (2) decodes the command, it drives the coil of the first control relay (5) to be energized, controls the preheating gun to descend and simultaneously connects the high-voltage ignition transformer (4) to generate a high-voltage pulse to achieve ignition.

10. A wireless remote control lifting and ignition control method for an RH preheating gun according to claim 9, characterized in that: When the ignition-off and rise button of the wireless remote transmitter (1) is pressed, the coded ignition-off and rise command is transmitted. The coil of the first control relay (5) is de-energized, the high-voltage ignition transformer (4) is de-energized and stops ignition, and at the same time the preheating gun is controlled to rise and return to the standby position.

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