A method and system for detecting a steel ladle car and a moving tow cable

Abstract

The present invention discloses a method and system for detecting a molten steel car and a mobile towline. The detection system includes: a voltage collector, a controller, and a host computer. The input end of the voltage collector is connected to the towline of the molten steel car for collecting the measured voltage value of the towline. The input end of the controller is connected to the output end of the voltage collector for processing the measured voltage value and transmitting damage information of the towline, wherein the damage information is generated based on a comparison between a set damage voltage limit and the measured voltage value. The communication end of the host computer is connected to the communication end of the controller for receiving and displaying the damage information. The present invention collects the measured voltage value of the towline through the voltage collector, determines whether the measured voltage value is within the damage voltage limit corresponding to the towline, and can detect the deterioration trend of the towline at any time based on the judgment result, thereby quickly determining the current status of the towline.

Description

Technical Field

[0001] The present invention relates to the technical field of tow cable safety detection, and in particular to a detection method and system for a molten steel car and a mobile tow cable. Background Art

[0002] The moving towline of the steelmaking molten steel car is wound and lowered on the drum along with the ladle car. Since the towline will stretch the main line and control line inside the towline when it is wound and lowered, and the winding and lowering action itself is equivalent to constantly "bending" the towline, long-term use or problems with the towline manufacturing process will cause the main line and control line of the towline to gradually break and be damaged, making it impossible to transmit electric energy to the equipment on the molten steel car or the power loss is too large. It takes time to replace the spare control line. Moreover, since the spare control line also moves with the drum, like the control line in use, the integrity of the spare control line cannot be guaranteed, and the detection time will be longer. The main line has no spare core. Once the main line is damaged, the motor will not be able to get power, and the molten steel car will not be able to run. The towline needs to be replaced as a whole, which takes longer and has a greater impact on production.

[0003] Therefore, how to accurately and quickly detect the current status of the tow cable in real time is a technical problem that needs to be solved urgently. Summary of the Invention

[0004] The present invention provides a method and system for detecting a molten steel car and a mobile tow cable, which can accurately and quickly detect the current state of the tow cable in real time.

[0005] The embodiments of the present invention provide the following solutions:

[0006] In a first aspect, an embodiment of the present invention provides a detection system for a mobile streamer, the detection system comprising: a voltage collector, a controller, and a host computer;

[0007] The input end of the voltage collector is connected to the towline of the molten steel car, and is used to collect the measured voltage value of the towline;

[0008] The input end of the controller is connected to the output end of the voltage collector, and is used to process the measured voltage value and send damage information of the streamer, wherein the damage information is generated based on a comparison between a set damage voltage limit and the measured voltage value;

[0009] The communication terminal of the host computer is connected to the communication terminal of the controller for receiving and displaying the damage information.

[0010] In an optional embodiment, the control end of the controller is connected to the control end of the electric terminal of the molten steel car, and is used to give control instructions to the control terminal.

[0011] In an optional embodiment, the power terminal includes a brake, and the control end of the controller is configured to output a delayed braking signal; the delayed braking signal is used to control the molten steel car to reach a preset position to perform a braking action when the power supply voltage of the brake is at a critical voltage, wherein the critical voltage is within the deterioration voltage limit.

[0012] In an optional embodiment, the voltage collector includes voltage transformers, the number of which is the same as the number of streamers, and is used to collect measured voltage values of corresponding streamers;

[0013] The primary winding of the voltage transformer is configured as an input end, connected to the corresponding towline, and the secondary winding of the voltage transformer is configured as an output end, connected to the input end of the controller. The voltage transformer is used to convert the original voltage value into the measured voltage value.

[0014] In an optional embodiment, one input end of the primary winding is connected to the live wire of the streamer, and the other input end is connected to the neutral wire.

[0015] In an optional embodiment, the controller includes an analog wireless transmitter, an analog wireless receiver and a PLC controller;

[0016] The input end of the analog wireless transmitter is connected to the output end of the voltage collector, and is used to wirelessly transmit the measured voltage value collected by the voltage collector;

[0017] The wireless receiving end of the analog wireless receiver is wirelessly connected to the wireless transmitting end of the analog wireless transmitter for forwarding the measured voltage value wirelessly transmitted by the analog wireless transmitter;

[0018] The input end of the PLC controller is connected to the output end of the analog wireless receiver, and is used to receive the measured voltage value forwarded by the analog wireless receiver.

[0019] In a second aspect, an embodiment of the present invention further provides a method for detecting a moving streamer, which is applied to the detection system described in any one of the first aspects, and the detection method comprises the following steps:

[0020] Get the measured voltage value of the steel car towing cable;

[0021] According to the type of the streamer, calling the corresponding damage voltage limit;

[0022] Determining whether the measured voltage value is within the breakdown voltage limit;

[0023] If yes, generating damage information of the streamer;

[0024] If not, continue to test the streamer.

[0025] In an optional embodiment, calling a corresponding breakdown voltage limit according to the type of the streamer includes:

[0026] If the tow cable is a motor power cable, the voltage dropout limit corresponding to the current given speed of the motor to which the motor power cable is connected is called according to the current given speed; wherein the voltage dropout limit corresponding to the current given speed is a low speed voltage dropout limit or a high speed voltage dropout limit;

[0027] If the type of the streamer is an online control line or a standby control line, the control line loss voltage limit is called.

[0028] In an optional embodiment, calling a corresponding breakdown voltage limit according to the type of the streamer further includes:

[0029] If the type of the towline is a limit control line, determining whether the molten steel car is in a preset position;

[0030] If so, calling the limit damage voltage limit according to the limit control line;

[0031] If not, detect the damage status of the towline outside the limit control line.

[0032] In an optional embodiment, the streamer is a brake control line, and after generating the damage information of the streamer, the method further includes:

[0033] Determining whether the molten steel car is in operation;

[0034] If so, the brake is controlled to remain on, and the braking action is performed after the molten steel car reaches a preset position.

[0035] In a third aspect, an embodiment of the present invention further provides a molten steel car, which includes the detection system described in any one of the first aspects.

[0036] Compared with the prior art, the method and system for detecting a molten steel car and a mobile tow cable provided by the present invention have the following advantages:

[0037] The present invention uses a voltage collector to collect the measured voltage of the streamer cable and determine whether the measured voltage is within the corresponding voltage limit for the streamer cable. Based on the judgment result, the degradation trend of the streamer cable can be detected at any time, and the current condition of the streamer cable can be quickly determined. This condition can be used as a basis for replacing the backup cable, eliminating the need for manual calibration and shortening troubleshooting time. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 A schematic structural diagram of a molten steel car provided in an embodiment of the present invention;

[0040] Figure 2 A schematic structural diagram of a detection system for a mobile streamer provided in an embodiment of the present invention;

[0041] Figure 3 A control logic diagram of the detection system provided by an embodiment of the present invention;

[0042] Figure 4 The present invention provides a flow chart of a method for detecting a moving streamer. DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field fall within the scope of protection of the embodiments of the present invention.

[0044] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of a molten steel car. The car is equipped with a reel to control the winding and unwinding of the towline. The number of towlines is determined by the car's power supply requirements. Typically, the towline consists of three main lines, 12 online control lines, and 14 backup control lines. The main lines power the motors, the online control lines power the brakes, warning lights, reel, and limit switches, and the backup control lines are used to replace the online control lines in the event of damage. The motor can be a 380V AC motor, or a DC motor. It is mechanically connected to the wheels of the molten steel car to drive the car. The brake is mechanically connected to the wheels to brake the car. The molten steel car typically operates within a range. When it reaches the end of its travel, it brakes to a stop, detected by the limit switches. If a fault occurs during operation, a warning light issues an alarm. The detection system and method provided by the present invention are used to detect the status of the towline on a molten steel car. The detection system and method of the present invention are described below with reference to specific embodiments.

[0045] See also Figure 2 , Figure 2A structural schematic diagram of a detection system for a mobile towline provided in an embodiment of the present invention, the detection system comprising: a voltage collector, a controller, and a host computer; the input end of the voltage collector is connected to the towline of a molten steel car for collecting the measured voltage value of the towline; the input end of the controller is connected to the output end of the voltage collector for processing the measured voltage value and sending damage information of the towline, wherein the damage information is generated based on a comparison between a set damage voltage limit and the measured voltage value; the communication end of the host computer is connected to the communication end of the controller for receiving and displaying the damage information.

[0046] Specifically, the voltage collector can be a digital voltmeter or a voltage acquisition board constructed by an operational amplifier and an AD chip to accurately collect the measured voltage value of the tow cable; the controller can be a control board equipped with a single-chip microcomputer, which can detect in real time whether the measured voltage value is within the damage voltage limit when the molten steel car is in operation, and send the generated damage information to the host computer; the host computer can be a PC (Personal Computer) or a touch screen to display the damage information accordingly. Of course, the host computer can also adjust the set damage voltage limit according to the hardware changes of the molten steel car.

[0047] To minimize the impact of cable breakage on the detection system, a control box is installed on the molten steel car, fixedly mounted on the outer end face of the drum. A voltage collector is installed inside the control box. If the voltage collector needs to be powered, its power line does not wrap around the drum, but enters separately from the side of the control box. The input end of the voltage collector can also be arranged on the side of the control box, connected to the connection point between the cable and the power terminal to collect the measured voltage value of the cable. Of course, if power is needed in the control box, it can also be powered by a battery-powered mobile power supply installed in the control box or on the molten steel car.

[0048] When the detection system needs to inspect the towline, the voltage collector collects the measured voltage value of the towline. Of course, depending on the matching between the voltage collector and the controller, the measured voltage value can also be converted into a corresponding voltage signal and output to the controller. The controller determines whether the measured voltage value is within the damage voltage limit and generates damage information for display on the host computer. The damage information can be set as general damage or severe damage, so that on-site personnel can clearly understand the current status of the towline. If no damage is found, the towline inspection continues.

[0049] In an optional embodiment, the control end of the controller is connected to the control end of the electric terminal of the molten steel car, and is used to give control instructions to the control terminal.

[0050] Specifically, the power terminal can be a motor, and the controller controls the motor to run or stop through control instructions. Of course, the power terminal can also include a speed regulator, and the controller is connected to the speed regulator, which is connected to the motor, and controls the motor to rotate at different speeds through control instructions. For an AC motor, the speed regulator can be a frequency converter; for a DC motor, the speed regulator can be a DC speed regulating board that sends PWM (Pulse Width Modulation). It can be understood that the motor corresponds to different drive voltages at different speeds. Within the rated speed, the higher the speed, the higher the drive voltage; conversely, the lower the drive voltage. Therefore, the voltage limit can be set in multiple intervals to match the current speed of the motor for determination.

[0051] See Figure 3 , Figure 3 The control logic diagram of the detection system provided in an embodiment of the present invention shows a controller that controls the motor's given speed to high or low speed. The motor is a 380V AC motor, and the voltage collector collects the voltages of the motor's main lines A, B, and C, and the neutral line. Due to the presence of operating load, the voltage fluctuates within a certain range during the motor's operating state. Therefore, for example, when the molten steel car is running at high speed, the motor's operating frequency is 40Hz, and the normal range of the motor phase voltage is set to 175V to 190V; for example, when the molten steel car is running at low speed, the motor's operating frequency is 25Hz, and the normal range of the motor phase voltage is set to 105V to 115V. At high speed, the voltage limit is less than or equal to 170V; at low speed, the voltage limit is less than or equal to 100V. If the voltage of any main line is within the voltage limit, the controller generates voltage information and displays it on the host computer.

[0052] In an optional embodiment, the power terminal includes a brake, and the control end of the controller is configured to output a delayed braking signal; the delayed braking signal is used to control the molten steel car to reach a preset position to perform a braking action when the power supply voltage of the brake is at a critical voltage, wherein the critical voltage is within the damage voltage limit; or lower than the damage voltage limit. The critical voltage refers to the voltage that ensures that when the brake is in the open state, this voltage can maintain the open state, but cannot enable the brake to be opened again when the brake is in the closed state. The critical voltage indicates that the brake control line used to power the brake may have a partial cable break and is in a "virtual break" state. In this state, due to the structural limitations of the brake itself, the instantaneous current is large when it is opened. Therefore, after closing the brake, there may be a risk that it cannot be opened again.

[0053] Specifically, the brake is a holding brake for a hydraulic cylinder driven by a three-phase motor installed at the motor drive end. The brake's online control lines include z1, z2, and z3. A voltage collector collects the voltage between each of these three online control lines and the neutral line. During normal operation, the measured voltage is 220±10V. When the molten steel car needs to brake, the controller outputs a braking signal to activate the brake. Because the braking action directly affects the stopping position of the molten steel car, which is primarily used to transfer molten steel from the converter, ensuring the car can be moved out of the furnace position can prevent production from being affected by cable failures during the current transfer cycle. Taking online control line z1 as an example, the corresponding damage voltage limit is set to 200V or less. When the measured voltage value is within the damage voltage limit, damage information is generated and sent to the host computer as an alarm. At the same time, the current measured voltage value is further determined to be within the critical voltage. If it is within the critical voltage, it indicates that the voltage carried by the brake's online control line can keep the brake in the open state. At this time, the brake is determined to be in the open state. If it is in the open state, the brake will no longer be controlled to close, and the damage information will be transmitted to the host computer. The molten steel car will be automatically controlled to operate at a low speed to prevent slipping. The open state of the brake can be determined by the open and closed state of the auxiliary contacts of the contactor in the brake main circuit.

[0054] The critical voltage is 190V to 200V. It should be noted that this critical voltage is determined based on the selected brake type and multiple on-site tests. When the brake is open, it can remain open within this low voltage range. However, once closed, this voltage range no longer controls the brake opening. Therefore, when the brake is within this voltage range, the three control lines of the brake not only detect and alarm as described above, but the controller also sends an alarm signal to the host computer indicating that the brake is always open, based on this voltage range, and automatically controls the molten steel car to operate at a low speed of 25Hz to prevent slippage. The logic control of online control lines z2 and z3 is the same as that of z1.

[0055] Other electrical terminals on the molten steel car include an alarm light, a reel, and a limit switch. The alarm light's online control lines are j1 and j2, while the reel's online control lines are t1, t2, and t3, with corresponding voltage limits of 200V or less. There are two limit switches (not shown), and the online control lines are x1, x2, x3, and x4, with corresponding voltage limits of 195V or less.

[0056] In an optional embodiment, the voltage collector includes voltage transformers, the number of which is the same as the number of streamers, and is used to collect measured voltage values of corresponding streamers;

[0057] The primary winding of the voltage transformer is configured as an input end and connected to the corresponding tow cable. The secondary winding of the voltage transformer is configured as an output end and connected to the input end of the controller. The voltage transformer is used to convert the original voltage value into a measured voltage value.

[0058] Specifically, the voltage transformer converts high voltage by a certain multiple to low voltage for output detection, which is then directly output to the controller. This makes it highly suitable for AC power supply scenarios in molten steel cars. The number of voltage transformers is set to 29, with one voltage transformer for each of the three main lines and 26 control lines. The voltage transformers are arranged spatially within the control box, mounted on the ribs in rows of four, three rows, and three columns. By configuring the same number of voltage transformers as the number of tow cables, the measured voltage value of each tow cable is collected, allowing rapid identification of the abnormal cable. During maintenance, no further testing and calibration is required, allowing for rapid replacement of spare cables, shortening troubleshooting time.

[0059] In an optional embodiment, one input end of the primary winding is connected to the live wire of the streamer cable, and the other input end is connected to the neutral wire.

[0060] Specifically, a voltage transformer is used to collect the measured voltage value of the towline. Directly connected to the live and neutral wires, the corresponding measured voltage value can be used to determine whether the cable is damaged, without the need for logical judgment. Alternatively, for the voltage measurement of three main lines, two can be grouped together to measure the 380V voltage of the live phase. If a problem is found in one of the three lines, a logical judgment is performed to determine the main line with the problem and display the damage information.

[0061] In an optional embodiment, the controller includes an analog wireless transmitter, an analog wireless receiver and a PLC controller;

[0062] The input end of the analog wireless transmitter is connected to the output end of the voltage collector, and is used to wirelessly transmit the measured voltage value collected by the voltage collector; the wireless receiving end of the analog wireless receiver is wirelessly connected to the wireless transmitting end of the analog wireless transmitter, and is used to forward the measured voltage value wirelessly transmitted by the analog wireless transmitter; the input end of the PLC controller is connected to the output end of the analog wireless receiver, and is used to receive the measured voltage value forwarded by the analog wireless receiver.

[0063] Specifically, wireless communication is performed through an analog wireless transmitter and an analog wireless receiver, which simplifies the cable laying and installation process. For existing molten steel car structures, the detection system is easier to install and implement detection.

[0064] The embodiment of the present invention provides a method for detecting a mobile streamer, which is applied to any of the above-mentioned systems. Figure 4 , the detection method comprises the following steps:

[0065] Step S11: obtaining the measured voltage value of the molten steel car tow cable.

[0066] Specifically, the measured voltage value is obtained when the molten steel car is running. The running and non-running states of the molten steel car can be obtained by giving a control instruction for the motor operation. The control instruction is used as a flag to obtain the measured voltage value of the tow cable on time, wherein the measured voltage value can be collected and obtained through a voltage transformer.

[0067] Step S12: According to the type of the streamer, the corresponding damage voltage limit is called.

[0068] Specifically, the towlines of a molten steel car include motor power lines, online control lines, backup control lines, and limit control lines. Different towlines supply different power terminals, resulting in varying supply voltages. Consequently, the corresponding voltage limits are also different. For ease of use, each towline is numbered, and the type is determined by the number, which then determines the corresponding voltage limit.

[0069] Step S13: determine whether the measured voltage value is within the damage voltage limit; if so, generate damage information of the streamer; if not, continue to detect the streamer.

[0070] Specifically, if the measured voltage falls within the damage voltage limit, it indicates a possible cable breakage. To eliminate safety hazards and prevent production disruptions, damage information is generated for the cable, and on-site personnel can then replace the cable based on this information. Alternatively, a spare cable can be switched to replace the damaged cable. This switching can be automatic via a control contactor or manual, eliminating the need for further testing, significantly reducing troubleshooting time. It is understood that damage information can include both general and severe damage, generated based on the deviation range between the measured voltage and the damage voltage limit.

[0071] In an optional embodiment, calling a corresponding breakdown voltage limit according to the type of the streamer includes:

[0072] If the tow cable is a motor power line, the voltage loss limit corresponding to the current given speed is called according to the current given speed of the motor connected to the motor power line; among which, the voltage loss limit corresponding to the current given speed is the low speed voltage loss limit or the high speed voltage loss limit; if the tow cable is an online control line or a standby control line, the control line voltage loss limit is called.

[0073] Specifically, at a high speed of 40Hz, the normal range of the motor voltage is 175V~190V; at a low speed of 25Hz, the normal range of the motor voltage is 105V~115V; the high-speed voltage loss limit is less than or equal to 170V, and the low-speed voltage loss limit is less than or equal to 100V; when the molten steel car is running, the standby control line is connected to an AC 218~230V voltage, both are in a no-load state, and the control line voltage loss limit is set to less than or equal to 200V.

[0074] In an optional embodiment, calling a corresponding breakdown voltage limit according to the type of the streamer further includes:

[0075] If the type of the tow cable is a limit control line, determine whether the molten steel car is in the preset position; if so, call the limit damage voltage limit according to the limit control line; if not, detect the damage status of the tow cable outside the limit control line.

[0076] Specifically, the limit control line is used to conduct the limit signal of the molten steel car. When the molten steel car reaches the preset position, the limit switch sends the limit signal to the PLC controller through the limit control line. The normal voltage of the limit signal is between 218V and 230V (caused by power supply voltage fluctuations). Regardless of whether the molten steel car is running or not, there will be a limit signal as long as it is at the preset position. There are usually 4 limit control lines, numbered x1, x2, x3 and x4. When the voltage is less than or equal to 195V, the limit signal is lost. At this time, the control line is broken. Therefore, when any limit control line is less than or equal to 195V, that is, the limit damage voltage limit is less than or equal to 195V, the PLC controller generates a damage information alarm and transmits it to the host computer, indicating that this limit control line is abnormal.

[0077] In an optional embodiment, the streamer is a brake control line, and after generating the damage information of the streamer, the method further includes:

[0078] Determining whether the molten steel car is in operation;

[0079] If so, the brake is controlled to remain on, and the braking action is performed after the molten steel car reaches a preset position.

[0080] Specifically, the type of tow cable is a brake control line. It is determined whether the measured voltage value is within the damage voltage limit, and damage information of the tow cable is generated, indicating that there is a risk of "virtual break" in the brake control line. The control brake is continuously turned on to avoid the inability to turn it on again to perform the braking action after the controller is turned off. The brake is continuously turned on when the brake is continuously powered on. The size of its braking force is controlled by the power supply parameters (voltage or current). It can control the molten steel car to run at a low speed, which is conducive to using a relatively small braking force to brake and stop the molten steel car. The motor operating frequency is controlled to 25-28Hz, and the molten steel car is in a low-speed running state, which can prevent the molten steel car from slipping. When the molten steel car is not in operation, the upper computer displays the damage information of the brake control line and inspects and repairs the brake control line.

[0081] Based on the same inventive concept as the mobile tow cable detection system, an embodiment of the present invention further provides a molten steel car, which includes any of the above-mentioned detection systems.

[0082] The technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0083] 1. The voltage collector collects the measured voltage of the streamer and determines whether it is within the corresponding voltage limit for the streamer. This determination can be used to identify the streamer's deterioration trend and quickly determine its current condition. This condition can be used as a basis for replacing a backup cable, eliminating the need for manual calibration and shortening troubleshooting time.

[0084] 2. Reduce the steel plant's production costs. According to the statistics of the annual failure frequency of the five converters, shorten the fault handling time, predict the status of the backup control line, and arrange maintenance in advance, etc., at least 30,000 yuan can be saved each year.

[0085] Since the electronic device described in this embodiment is an electronic device used to implement the information processing method in the embodiment of this application, based on the information processing method described in the embodiment of this application, those skilled in the art will be able to understand the specific implementation of the electronic device of this embodiment and its various variations, so how the electronic device implements the method in the embodiment of this application will not be described in detail here. As long as those skilled in the art implement the electronic device used by the information processing method in the embodiment of this application, it falls within the scope of protection to be provided by this application.

Claims

1. A detection system for a mobile streamer, characterized in that: The detection system includes: a voltage collector, a controller and a host computer; The input end of the voltage collector is connected to the towline of the molten steel car, and is used to collect the measured voltage value of the towline; The input end of the controller is connected to the output end of the voltage collector, and is used to process the measured voltage value and send damage information of the streamer, wherein the damage information is generated based on a comparison between a set damage voltage limit and the measured voltage value; The communication terminal of the host computer is connected to the communication terminal of the controller, and is used to receive and display the damage information; If the towline is a motor power line, the voltage dropout limit corresponding to the current given speed is called based on the current given speed of the motor to which the motor power line is connected; wherein the voltage dropout limit corresponding to the current given speed is either a low speed voltage dropout limit or a high speed voltage dropout limit; If the type of the towline is an online control line or a spare control line, the control line loss voltage limit is called; The type of the streamer is a brake control line, and after generating the damage information of the streamer, the method further includes: Determining whether the molten steel car is in operation; If so, the brake is controlled to remain on, and the braking action is performed after the molten steel car reaches a preset position.

2. The detection system for a mobile streamer according to claim 1, characterized in that: The control end of the controller is connected to the control end of the electric terminal of the molten steel car, and is used to give control instructions to the control terminal.

3. The detection system for a mobile streamer according to claim 2, characterized in that: The power terminal includes a brake, and the control end of the controller is configured to output a delayed braking signal; the delayed braking signal is used to control the molten steel car to reach a preset position and perform a braking action when the power supply voltage of the brake is at a critical voltage, wherein the critical voltage is within the breakdown voltage limit.

4. The detection system for a mobile streamer according to claim 1, characterized in that: The voltage collector includes a voltage transformer, the number of which is the same as the number of the tow cables, and is used to collect the measured voltage values of the corresponding tow cables; The primary winding of the voltage transformer is configured as an input end, connected to the corresponding towline, and the secondary winding of the voltage transformer is configured as an output end, connected to the input end of the controller. The voltage transformer is used to convert the original voltage value into the measured voltage value.

5. The detection system for a mobile streamer according to claim 1, characterized in that: The controller includes an analog wireless transmitter, an analog wireless receiver and a PLC controller; The input end of the analog wireless transmitter is connected to the output end of the voltage collector, and is used to wirelessly transmit the measured voltage value collected by the voltage collector; The wireless receiving end of the analog wireless receiver is wirelessly connected to the wireless transmitting end of the analog wireless transmitter for forwarding the measured voltage value wirelessly transmitted by the analog wireless transmitter; The input end of the PLC controller is connected to the output end of the analog wireless receiver, and is used to receive the measured voltage value forwarded by the analog wireless receiver.

6. A method for detecting a moving streamer, characterized in that: Applied to the detection system according to any one of claims 1 to 5, the detection method comprises the following steps: Get the measured voltage value of the steel car towing cable; According to the type of the streamer, calling the corresponding damage voltage limit; Determining whether the measured voltage value is within the breakdown voltage limit; If yes, generating damage information of the streamer; If not, continue to test the streamer.

7. The method for detecting a moving streamer according to claim 6, wherein: The step of calling a corresponding voltage limit for damage according to the type of the streamer includes: If the tow cable is a motor power cable, the voltage dropout limit corresponding to the current given speed of the motor to which the motor power cable is connected is called according to the current given speed; wherein the voltage dropout limit corresponding to the current given speed is a low speed voltage dropout limit or a high speed voltage dropout limit; If the type of the streamer is an online control line or a standby control line, the control line loss voltage limit is called.

8. The method for detecting a mobile streamer according to claim 6, wherein: The step of calling a corresponding voltage limit for damage according to the type of the streamer also includes: If the type of the towline is a limit control line, determining whether the molten steel car is in a preset position; If so, calling the limit damage voltage limit according to the limit control line; If not, detect the damage status of the towline outside the limit control line.

9. The method for detecting a mobile streamer according to claim 6, wherein: The type of the streamer is a brake control line, and after generating the damage information of the streamer, the method further includes: Determining whether the molten steel car is in operation; If so, the brake is controlled to remain on, and the braking action is performed after the molten steel car reaches a preset position.

10. A molten steel car, characterized in that: The molten steel car comprises the detection system according to any one of claims 1-5.

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