Coal car electromagnetic automatic emergency cut-off valve and control method

Abstract

The present application relates to a kind of coal car electromagnetic automatic emergency cut-off valve and control method, wherein emergency cut-off valve includes electromagnet, counterweight disc, and shell installed in series in coal car dust removal pipeline, shell is equipped with the shutter board compatible with coal car dust removal pipeline;Counterweight disc is adsorbed on the bottom surface of electromagnet by the magnetic force of electromagnet, and connecting rod is fixedly connected on counterweight disc, connecting rod is fixedly connected with the cover plate covering the upper opening of coal car diffusion pipe, and horizontal shaft I is arranged between counterweight disc and cover plate and passes through connecting rod, and connecting rod is rotatably connected with coal car diffusion pipe by horizontal shaft I;Counterweight disc is also connected with shutter board by connecting rod mechanism, and when counterweight disc moves downward, shutter board is closed by connecting rod mechanism, and cut-off is formed to coal car dust removal pipeline.The present application controls counterweight disc using the magnetic force characteristics of electromagnet, and using connecting rod and connecting rod mechanism, so that counterweight disc falls while opening the cover plate of the upper opening of coal car diffusion pipe, and closing shutter board, to realize timely and reliable cut-off action.

Description

Technical Field

[0001] This invention relates to the field of safety protection technology for coal loading operations in the coking industry, and in particular to an emergency shut-off valve, specifically an electromagnetic automatic emergency shut-off valve for coal cars and its control method. Background Technology

[0002] In the coking plant's production process, coal loading is a core production step. This process generates a large amount of raw coal gas, which must be collected and processed systematically using the negative pressure suction generated by the dust removal system to prevent leakage and environmental pollution. The emergency protection device of the coal loading car's dust removal system is a crucial piece of equipment for ensuring the safety of the dust removal pipeline and preventing sudden accidents. Its core function is to respond to abnormal operating conditions such as sudden power outages, dust removal fan malfunctions, and pipeline blockages, preventing raw coal gas from mixing with air and accumulating in the dust removal pipeline due to insufficient or absent suction, which could lead to major safety accidents such as explosions and fires.

[0003] Currently, the protection devices of traditional coal loading car dust removal systems have many technical defects and safety hazards in actual production applications, and can no longer meet the safe, efficient, and intelligent operation requirements of modern coking production. These defects are mainly reflected in the following three aspects: First, parameter monitoring relies on manual labor, resulting in a significant lag in emergency response. The existing equipment lacks automated interlocking control with the coal loading system and dust removal system. Key parameters such as dust suction power and equipment operating status depend entirely on real-time manual monitoring by operators. In actual production, operators are susceptible to factors such as inattention, visual errors, and environmental interference, making it impossible to achieve 24 / 7 uninterrupted and accurate monitoring. In the event of emergencies such as decreased dust suction power or abnormal power outages, it is difficult to detect problems in a timely manner, leading to significant delays in emergency judgment and operation, and missing the optimal window for safe handling.

[0004] Secondly, the cutting-off operation relies on manual operation, posing both high safety risks and high labor intensity. When the actual suction power of the dust removal system is detected to be lower than the suction power required for safe production, the traditional emergency cutting-off device cannot automatically perform the cutting-off action, and the coal car driver or on-site operator must manually operate the valve to cut off the gas. This manual operation mode not only significantly increases the labor intensity of the personnel on duty, but more importantly, manual operation suffers from slow reaction speed and untimely action. From the detection of the abnormality to the completion of manual cutting off, it takes several seconds or even longer. In the high-risk production environment of coking, this extremely short time difference may cause a large amount of raw coal gas to mix with air, forming an explosive mixture and causing a serious safety accident.

[0005] Third, the entire reset operation is manual, resulting in low production recovery efficiency. Even after the dust removal system malfunctions and suction returns to normal production conditions, the emergency shut-off device still requires manual reset. Operators must manually return the shut-off valve to the closed position and confirm that the equipment is functioning correctly before restarting the coal loading operation. This manual reset method not only further increases the workload of operators, prolongs production interruption time, and reduces the efficiency of coal car operations, but also may lead to problems such as improper operation and valve incomplete closure during the manual reset process, leaving new safety hazards.

[0006] Currently, the industry's conventional approach to addressing these issues primarily involves increasing staffing, assigning two operators—one in the dust removal control room and the other in the coal truck—to closely monitor suction parameters in real time. This is coupled with intensive job training to deliberately improve the emergency response speed of coal truck drivers, attempting to shorten reaction and operation time in abnormal situations. However, in practice, this purely manual intervention is a passive approach and fails to address the fundamental technical problem. The inherent lag and uncertainty of manual operation remain, personnel are under constant high-pressure monitoring, experience high labor intensity, and suffer immense physical and mental stress. Furthermore, the explosion safety risks under abnormal operating conditions cannot be effectively controlled, making this a pressing technical challenge in coal loading operations within the coking industry. Summary of the Invention

[0007] This invention addresses the shortcomings of existing technologies by providing an electromagnetic automatic emergency shut-off valve and control method for coal trucks. This not only ensures the timeliness of emergency shut-off but also achieves automatic shut-off through the valve's structural design, significantly reducing the labor intensity of workers.

[0008] This invention is achieved through the following technical solution: providing an electromagnetic automatic emergency shut-off valve for coal cars, comprising a fixedly installed electromagnet, a counterweight plate located below the electromagnet, and a housing connected in series with the dust removal pipe of the coal car. The housing contains a gate adapted to the dust removal pipe of the coal car. The counterweight plate is magnetically attracted to the bottom surface of the electromagnet. A connecting rod is fixedly connected to the counterweight plate, and the connecting rod is fixedly connected to a cover plate covering the upper opening of the coal car's vent pipe. A horizontal shaft I is provided between the counterweight plate and the cover plate, passing through the connecting rod. The connecting rod is rotatably connected to the coal car's vent pipe via the horizontal shaft I. The counterweight plate is also connected to the gate plate via a linkage mechanism. When the counterweight plate moves downward, the gate plate is closed via the linkage mechanism, thus shutting off the dust removal pipe of the coal car.

[0009] This solution utilizes the properties of electromagnets to become magnetic when energized and demagnetize when de-energized to fix and release the counterweight plate. After the electromagnet is de-energized, the counterweight plate moves downward under its own weight. The lever action of the connecting rod opens the cover plate at the top of the coal car's vent pipe, and at the same time, the force is transmitted through the linkage mechanism to close the gate, achieving timely cut-off.

[0010] As an optimization, the linkage mechanism includes a crank arm, a connecting rod I rotatably connected to the counterweight plate via a horizontal shaft II, a connecting rod II hinged to the lower end of connecting rod I, and a connecting rod III hinged to the end of connecting rod II away from connecting rod I. The angle between connecting rod II and connecting rods I and III is greater than zero degrees, and both connecting rod II and the connecting rod extend forward. The crank arm includes a horizontal shaft III rotatably connected to the side wall of the housing, and a pull rod eccentrically set and fixedly connected to the horizontal shaft III. The pull rod is located above the gate and connected to the gate via a pull rope. The horizontal shaft III is fixedly connected to connecting rod III. The linkage mechanism of this optimized scheme transmits force through the sequential hinged connection of connecting rods I, II, and III, driving the crank arm to rotate and thus driving the gate. It has a simple structure and high reliability.

[0011] As an optimization, the air outlet connecting the housing and the dust removal duct is located below the gate. The pull rope is connected to one end of the gate, and the other end of the gate is hinged to the bottom of the housing. This optimized design allows the gate to close under its own weight when the crank arm rotates, resulting in a simpler and more reliable structure.

[0012] As an optimization, the crank arm further includes connecting rods extending from both ends of the pull rod towards the same side, and crossbars extending outward from the ends of the two connecting rods away from the pull rod, passing through the sidewall of the housing, wherein the crossbars extending towards the connecting rod III form the horizontal axis III. This optimized crank arm adopts a symmetrical structure, improving stability during rotation and further enhancing the reliability of the operation.

[0013] As an optimization, the system also includes a winch and a mounting bracket for mounting the electromagnet. A fixed pulley is rotatably mounted on the mounting bracket, and the movable end of the winch's lifting rope extends downwards through the fixed pulley and connects to the counterweight plate. This optimized solution, by incorporating a winch, allows the counterweight plate to be lifted to the electromagnet when working conditions return to normal, significantly reducing the labor intensity for workers.

[0014] As an optimization, a buffer is fixed on the mounting bracket, and the buffer is located on the movement trajectory below the counterweight plate. This optimization scheme prevents damage to the equipment from the impact of the counterweight by setting up a buffer.

[0015] This solution also provides a control method for an electromagnetic automatic emergency shut-off valve for coal cars, including the following steps: S1. Set up a control system and pre-set a first preset suction signal as an emergency start threshold in the control system. During the entire cycle of coal loading operation, the control system collects dust removal suction data in real time through the pressure transmitter of the dust removal system and continuously compares and analyzes the data; S2. When the suction value is detected to be lower than the first preset signal, the control system immediately generates an emergency cut-off command, the electromagnet is de-energized and demagnetized, and the counterweight plate moves downward under its own weight; S3. During the downward movement of the counterweight plate, the lever action of the connecting rod is used to open the cover plate covering the upper opening of the coal car vent pipe upward; at the same time, the rotational connection between the connecting rod and the coal car vent pipe is used to make the counterweight plate move forward during the downward movement, and then through the force transmission of connecting rod I, connecting rod II and connecting rod III, the crank arm is driven to rotate downward and close the gate. S4. When production conditions are restored, the electromagnet is energized, the counterweight plate moves upward and is attracted to the bottom of the electromagnet, and the cover plate covers the upper opening of the coal car vent pipe under the lever action of the connecting plate. At the same time, under the force transmission action of the linkage mechanism, the crank arm rotates upward and opens the gate.

[0016] The beneficial effects of this invention are as follows: By utilizing the magnetic properties of an electromagnet to control the counterweight plate, and using a connecting rod and linkage mechanism, the counterweight plate opens the cover plate at the top of the coal car's vent pipe and closes the gate plate as it falls, achieving a timely and reliable cutting-off action. After production conditions are restored, the counterweight plate is reset by a winch. Simultaneously with the reset of the counterweight plate, the cover plate closes and the gate plate opens. This not only effectively reduces the labor intensity of personnel and eliminates the safety hazards caused by manual operation, but also fundamentally improves the safety protection level of coal loading operations in coking plants, avoiding explosion accidents caused by abnormal dust suction. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is the front view of the present invention; As shown in the figure: 1. Electromagnet, 2. Mounting bracket, 3. Winch, 4. Lifting rope, 5. Buffer, 6. Dust collector main pipe, 7. Dust collector guide sleeve, 8. Housing, 9. Vent pipe, 10. Cover plate, 201. Counterweight plate, 202. Connecting rod I, 203. Connecting rod II, 204. Gate plate, 205. Connecting rod III, 206. Connecting rod. Detailed Implementation

[0018] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0019] like Figure 1 and 2 The diagram shows an electromagnetic automatic emergency shut-off valve for a coal car, comprising a mounting frame 2, an electromagnet 1 fixedly mounted on the mounting frame 2, a counterweight plate 201 located below the electromagnet, and a housing 8 connected in series with the dust removal pipeline of the coal car. The housing contains a gate 204 adapted to the dust removal pipeline. In this embodiment, the rear side wall of the housing is connected to the dust removal main pipe 6 of the dust removal pipeline, and an air inlet communicating with the dust removal main pipe is opened on the rear side wall of the housing. The bottom of the housing is connected to a dust removal guide sleeve 7, and an air outlet communicating with the dust removal guide sleeve 7 is opened at the bottom of the housing.

[0020] The counterweight plate 201 is attracted to the bottom surface of the electromagnet 1 by the magnetic force of the electromagnet 1. A connecting rod 206 is fixed to the front side of the counterweight plate 201. The connecting rod 206 extends forward and is fixed to the cover plate 10 covering the upper opening of the coal car vent pipe 9. A horizontal shaft I is provided between the counterweight plate 201 and the cover plate 10, which passes through the connecting rod. The connecting rod 206 is rotatably connected to the coal car vent pipe 9 through the horizontal shaft I, so that the connecting rod forms a lever structure with the horizontal shaft I as the fulcrum.

[0021] The counterweight plate 201 is also connected to the gate 204 via a linkage mechanism. When the counterweight plate moves downward, the gate is closed via the linkage mechanism, cutting off the dust removal pipeline of the coal car. When the counterweight plate moves upward, the gate is opened via the linkage mechanism.

[0022] Specifically, the linkage mechanism includes a crank arm, a connecting rod I 202 rotatably connected to the counterweight plate via a horizontal shaft II, a connecting rod II 203 hinged to the lower end of connecting rod I, and a connecting rod III 205 hinged to the end of connecting rod II away from connecting rod I. The angle between connecting rod II and connecting rods I and III is greater than zero degrees. Connecting rod II 203 and connecting rod 206 both extend forward, while connecting rods I and III both extend downward. The connecting rods I, II, and III as a whole form a transverse Z-shape.

[0023] The crank arm includes a horizontal shaft III rotatably connected to the side wall of the housing, and a pull rod eccentrically positioned and fixedly integrated with the horizontal shaft III. The pull rod is located above the gate and connected to the gate via a pull rope. The horizontal shaft III is fixedly connected to the connecting rod III. The horizontal shafts I, II, and III are parallel to each other. The crank arm also includes connecting rods extending from both ends of the pull rod to the same side, and crossbars extending outward from the ends of the two connecting rods away from the pull rod, passing through the side wall of the housing. The crossbars extending toward the connecting rod III form the horizontal shaft III. The pull rod, connecting rods, and crossbars are integrally formed. The crossbars are parallel to the pull rods, and the connecting rods are perpendicular to the pull rods.

[0024] In this embodiment, the air outlet connecting the housing and the dust removal pipe is located below the gate. The pull rope is connected to one end of the gate, and the other end of the gate is hinged to the bottom of the housing. When the crank arm rotates upward, the gate is pulled up and opened by the pull rope. When the crank arm rotates downward, the gate rotates downward and closes under its own gravity.

[0025] This embodiment also includes a winch 3 and a mounting frame 2 for mounting the electromagnet. A fixed pulley is rotatably mounted on the mounting frame. The movable end of the hoisting rope 4 of the winch extends downward through the fixed pulley and is connected to the counterweight plate 201. The fixed pulley is higher than the bottom surface of the electromagnet in the height direction, and the fixed pulley is located on the side of the electromagnet away from the coal car vent pipe.

[0026] A buffer 5 is fixed on the mounting bracket. The buffer 5 is located on the movement trajectory below the counterweight plate. When the counterweight plate contacts the buffer, the gate is in the closed state. By setting the buffer, the impact when the counterweight plate falls is buffered to avoid damage to the equipment.

[0027] The working process of the emergency shut-off valve in this embodiment is as follows: During coal loading operations, when the suction power of the dust removal system cannot meet the safety requirements for loading, the system sends a control signal through the dust removal system suction detection to de-energize the electromagnet. Under the force of the counterweight plate, the connecting rod and linkage mechanism are driven to operate in conjunction, simultaneously closing the emergency valve gate and opening the vent pipe cover. The buffer reduces the impact of the counterweight plate on the electromagnet mounting frame and mitigates the force between the vent pipe cover and the emergency valve gate, preventing damage to the equipment from the impact.

[0028] Dust and raw coal gas generated during operations are transported to the vent pipe 9 via the coal car dust removal main pipe 6 for external release, preventing them from entering the dust removal pipeline through the dust removal guide sleeve 7, thus cutting off the risk of pipeline explosion. In the event of a sudden power outage, the overall emergency operation procedure is the same as described above.

[0029] Once production conditions are restored, the winch lifts the counterweight plate by using the hoisting rope, while simultaneously opening the emergency valve gate and closing the vent pipe cover, allowing the coal car to resume normal operation.

[0030] This embodiment also includes a control system. During continuous coal loading operations, a first preset suction signal and a second preset suction signal are pre-set on the pressure transmitter of the dust removal system as core control parameters. When the real-time suction value detected by the pressure transmitter is less than the first preset signal, the control system immediately instructs the electromagnet to de-energize and demagnetize, and the emergency shut-off valve quickly switches to the open state, effectively preventing the raw coal gas from mixing with air and entering the dust removal pipeline, thus avoiding the accumulation of mixed gas and causing an explosion safety accident at the source. When the dust removal system returns to stable operation and the real-time suction value rises back to the second preset suction signal, the control system automatically starts the winch, driving the emergency shut-off valve to move smoothly to the closed position. At the same time, the electromagnet is re-energized and magnetically locked, and the coal car quickly returns to the normal coal loading operation state.

[0031] This embodiment describes a control method for an electromagnetic automatic emergency shut-off valve for coal cars, comprising the following steps: S1. Set up a control system and pre-set a first preset suction signal as an emergency start threshold in the control system. During the entire cycle of coal loading operation, the control system collects dust removal suction data in real time through the pressure transmitter of the dust removal system and continuously compares and analyzes the data; S2. When the suction value is detected to be lower than the first preset signal, the control system immediately generates an emergency cut-off command, the electromagnet is de-energized and demagnetized, and the counterweight plate moves downward under its own weight; S3. During the downward movement of the counterweight plate, the lever action of the connecting rod is used to open the cover plate covering the upper opening of the coal car vent pipe upward; at the same time, the rotational connection between the connecting rod and the coal car vent pipe is used to make the counterweight plate move forward during the downward movement, and then through the force transmission of connecting rod I, connecting rod II and connecting rod III, the crank arm is driven to rotate downward and close the gate. S4. When production conditions are restored, the electromagnet is energized, the counterweight plate moves upward and is attracted to the bottom of the electromagnet, and the cover plate covers the upper opening of the coal car vent pipe under the lever action of the connecting plate. At the same time, under the force transmission action of the linkage mechanism, the crank arm rotates upward and opens the gate.

[0032] This invention establishes an automated interlocking control system between the suction signal of the dust removal system and the coal loading signal of the coal car, replacing the traditional manual real-time monitoring mode. The system autonomously completes suction detection and command issuance; by receiving interlocking control commands, it controls the electromagnet to automatically switch on and off, achieving automatic shut-off of the emergency shut-off valve without delay, replacing manual shut-off operation; by receiving system reset commands, it precisely controls the winch to drive the valve to reset, combined with the electromagnet's energized locking, achieving fully automatic reset after shut-off, replacing manual reset operation. Ultimately, it realizes fully automated and unmanned operation of the emergency isolation device from real-time monitoring, command generation, action execution to state recovery, comprehensively improving the equipment's emergency response speed and safety protection capabilities.

[0033] The entire coal loading process is deeply integrated with the suction signal from the pressure transmitter of the dust removal system, establishing a stable and reliable electrical interlock control loop. A first preset suction signal is set as an emergency activation threshold in the control system. Throughout the entire coal loading cycle, the control system collects dust removal suction data in real time via the pressure transmitter, continuously comparing and analyzing the data. Once the suction value is detected to be lower than the first preset signal, the system immediately generates an emergency cut-off command, eliminating the need for manual judgment or manual instructions. This achieves 24 / 7, fully automatic real-time monitoring of suction parameters during the coal loading process, fundamentally eliminating the reaction lag problem caused by manual monitoring and reducing emergency response time to milliseconds.

[0034] This invention employs a combined electromagnet and counterweight cutting mechanism to achieve automatic emergency cutting with no delay. During normal coal loading operations, the electromagnet is energized and magnetic, firmly attracting and locking the valve cover plate, keeping the valve stably closed. When an emergency cutting command is received from the control system, the electromagnet instantly de-energizes and loses its magnetic force. At this time, the counterweight plate moves rapidly under gravity, driving the emergency cutting valve to automatically switch to the open state. Simultaneously, this mechanism has a power failure protection function. When the coal car experiences a sudden power outage, the electromagnet automatically demagnetizes without a command, and the counterweight mechanism immediately triggers the cutting action, achieving dual emergency protection. This design completely eliminates manual operation, achieving automatic execution and zero-delay response of emergency cutting under abnormal operating conditions, minimizing emergency response time and preventing safety accidents.

[0035] This invention achieves fully automatic reset after shut-off by incorporating a winch. To address the challenge of manual reset in traditional devices, a dedicated winch actuator is added to the emergency shut-off valve, forming a closed-loop control system with the dust removal system's interlock signal and the cover plate positioning detection signal. When the dust removal system fault is cleared and the real-time suction power recovers to the second preset suction power signal, the control system automatically generates a reset command. Upon receiving the command, the winch starts and smoothly moves the electromagnet cover plate to the closed position. When the cover plate reaches the designated closed position, the positioning detection sensor immediately feeds back a signal, and the control system instructs the electromagnet to be energized and magnetically attracted, firmly locking the cover plate, thus fully restoring the emergency shut-off valve to its normal operating state. The entire reset process requires no manual intervention, is completed automatically and precisely, significantly reducing the labor intensity of operators, quickly resuming coal loading operations, improving production efficiency, and ensuring valve reset accuracy and sealing reliability.

[0036] This invention, through three major technological innovations—automated interlocking monitoring, automated cutting-off action, and automated reset operation—completely solves all the defects of traditional coal car dust removal emergency protection devices, achieving an upgrade of the emergency protection device. It has extremely high practical value and promotion prospects, and is suitable for the safety renovation and new construction of dust removal systems for coal cars in various coking plants.

[0037] Of course, the above description is not limited to the examples above. Technical features not described in this invention can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solutions of this invention and are not intended to limit this invention. This invention has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention do not depart from the spirit of this invention and should also fall within the scope of protection of the claims of this invention.

Claims

1. A coal car electromagnetic automatic emergency shut-off valve, characterized in that: It includes a fixed electromagnet (1), a counterweight plate (201) located below the electromagnet, and a housing (8) installed in series with the dust removal pipeline of the coal car. The housing is provided with a gate (204) adapted to the dust removal pipeline of the coal car. The counterweight plate (201) is attracted to the bottom surface of the electromagnet (1) by the magnetic force of the electromagnet (1). A connecting rod (206) is fixedly connected to the counterweight plate (201). The connecting rod (206) is fixedly connected to the cover plate (10) covering the upper opening of the coal car vent pipe (9). A horizontal shaft I is provided between the counterweight plate (201) and the cover plate (10) and passes through the connecting rod. The connecting rod (206) is rotatably connected to the coal car vent pipe (9) through the horizontal shaft I. The counterweight plate (201) is also connected to the gate (204) through a linkage mechanism. When the counterweight plate moves downward, the gate is closed through the linkage mechanism, thus cutting off the dust removal pipeline of the coal car.

2. The electromagnetic automatic emergency shut-off valve for coal cars according to claim 1, characterized in that: The linkage mechanism includes a crank arm, a connecting rod I (202) rotatably connected to the counterweight plate via a horizontal shaft II, a connecting rod II (203) hinged to the lower end of the connecting rod I, and a connecting rod III (205) hinged to the end of the connecting rod II away from the connecting rod I. The angle between the connecting rod II and the connecting rods I and III is greater than zero degrees, and both the connecting rod II and the connecting rod extend forward. The crank arm includes a horizontal shaft III rotatably connected to the side wall of the housing, and a pull rod that is eccentrically set to the horizontal shaft III and fixedly connected to it. The pull rod is located above the gate and is connected to the gate via a pull rope. The horizontal shaft III is fixedly connected to the connecting rod III.

3. The electromagnetic automatic emergency shut-off valve for coal trucks according to claim 2, characterized in that: The air outlet connecting the housing to the dust removal pipe is located below the gate. The pull rope is connected to one end of the gate, and the other end of the gate is hinged to the bottom of the housing.

4. The electromagnetic automatic emergency shut-off valve for coal cars according to claim 2, characterized in that: The crank arm also includes connecting rods extending from both ends of the pull rod toward the same side, and crossbars extending outward from the ends of the two connecting rods away from the pull rod and passing through the sidewall of the housing, wherein the crossbars extending toward the connecting rod III form the horizontal axis III.

5. The electromagnetic automatic emergency shut-off valve for coal trucks according to claim 1, characterized in that: It also includes a winch (3) and a mounting frame (2) for mounting the electromagnet. A fixed pulley is rotatably mounted on the mounting frame. The movable end of the hoisting rope (4) of the winch extends downward through the fixed pulley and is connected to the counterweight plate (201).

6. The electromagnetic automatic emergency shut-off valve for coal trucks according to claim 5, characterized in that: A buffer (5) is fixed on the mounting bracket, and the buffer (5) is located on the movement trajectory below the counterweight plate.

7. A control method for an electromagnetic automatic emergency shut-off valve for coal cars according to any one of claims 2 to 4, characterized in that, Includes the following steps: S1. Set up a control system and pre-set a first preset suction signal as an emergency start threshold in the control system. During the entire cycle of coal loading operation, the control system collects dust removal suction data in real time through the pressure transmitter of the dust removal system and continuously compares and analyzes the data; S2. When the suction value is detected to be lower than the first preset signal, the control system immediately generates an emergency cut-off command, the electromagnet is de-energized and demagnetized, and the counterweight plate moves downward under its own weight; S3. During the downward movement of the counterweight plate, the lever action of the connecting rod is used to open the cover plate covering the upper opening of the coal car vent pipe upward; at the same time, the rotational connection between the connecting rod and the coal car vent pipe is used to make the counterweight plate move forward during the downward movement, and then through the force transmission of connecting rod I, connecting rod II and connecting rod III, the crank arm is driven to rotate downward and close the gate. S4. When production conditions are restored, the electromagnet is energized, the counterweight plate moves upward and is attracted to the bottom of the electromagnet, and the cover plate covers the upper opening of the coal car vent pipe under the lever action of the connecting plate. At the same time, under the force transmission action of the linkage mechanism, the crank arm rotates upward and opens the gate.

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