Slab continuous casting machine protection device and system

Abstract

The utility model discloses a protection device and system for a slab continuous casting machine, relates to the field of steel making, and aims to solve the problem that when the slab continuous casting machine works for a long time, a brake clearance of a brake component of an electromagnetic brake changes along with the brake clearance, and the change of the brake clearance also leads to the increase of the working voltage of the electromagnetic brake. Therefore, according to the scheme, the brake clearance of the brake component of the corresponding electromagnetic valve is measured through the brake clearance measuring device, the voltage value of the loop where the corresponding electromagnetic brake is located is measured through the voltage collecting device, the fault condition of the electromagnetic brake is verified at the same time from two aspects, the controller can find out the faulted electromagnetic brake more accurately, and the fault detection accuracy is improved. And a power supply loop where the fault electromagnetic brake is located is controlled to be disconnected, so that the phenomenon that part of fault electromagnetic brakes burn out motors connected with the fault electromagnetic brakes due to changes of brake gaps is prevented.

Description

Technical Field

[0001] This utility model relates to the field of steelmaking, and in particular to a protective device and system for a slab continuous casting machine. Background Technology

[0002] With the development of science and technology, steelmaking technology has become increasingly advanced. Currently, the more advanced steelmaking technologies include continuous casting steelmaking technology, which requires the use of slab continuous casting machines. The role of the slab continuous casting machine is to continuously cast molten steel into slabs. This process replaces the ingot casting process in traditional steelmaking technology, greatly improving efficiency and product quality. Its stable operation is directly related to the connection efficiency of the entire steelmaking-rolling process, and it is also a key technological support for steel companies to reduce costs and enhance market competitiveness.

[0003] Existing slab continuous casting machines consist of a rectifier and an electromagnetic gate, such as... Figure 1 As shown, the rectifier is connected to the motor and the electromagnetic gate respectively. The rectifier is used to convert the AC power output by the motor into DC power required for the operation of the electromagnetic gate. When the slab continuous casting machine operates for a long time, the braking gap of the braking component of the electromagnetic gate will change accordingly, resulting in an increase in the operating voltage of the electromagnetic gate. This can lead to the electromagnetic gate coil or the motor connected to the slab continuous casting machine being burned out, which greatly reduces the safety of the casting process. Utility Model Content

[0004] The purpose of this utility model is to provide a protection device and system for a slab continuous casting machine. This solution not only measures the braking gap of the braking component of the corresponding battery valve, but also measures the voltage value of the circuit where the corresponding solenoid gate is located. It verifies the fault condition of the solenoid gate from two aspects at the same time, so that the controller can more accurately find the faulty solenoid gate and control the disconnection of the power supply circuit where the faulty solenoid gate is located, so as to prevent the motor connected to the faulty solenoid gate from burning out due to the change of its own braking gap.

[0005] To solve the above-mentioned technical problems, this utility model provides a protection device for a slab continuous casting machine, including: a plurality of rectifiers, an electromagnetic gate of the same number as each rectifier, a first switch of the same number as each rectifier, a voltage acquisition device of the same number as each rectifier, and a brake gap measuring device of the same number as each rectifier.

[0006] The input terminal of each rectifier is connected to the motor, and the output terminal is connected to the first terminal of the corresponding first switch;

[0007] The voltage acquisition terminal of each voltage acquisition device is connected to the second terminal of the corresponding first switch, and the output terminal is connected to the controller, for acquiring the voltage value of the circuit where the corresponding electromagnetic gate is located;

[0008] Each of the aforementioned brake gap measuring devices is set within a preset distance range of the brake component of the corresponding electromagnetic gate, and is used to measure the brake gap of the brake component of the corresponding battery valve;

[0009] The second end of each of the first switches is connected to the corresponding electromagnetic gate, and the control end is connected to the controller. It is used to disconnect the switch based on the control of the controller when the voltage value of the circuit where each electromagnetic gate is located is greater than a preset voltage threshold and / or the braking gap of the braking component of each electromagnetic gate is greater than a preset braking gap threshold.

[0010] Optional, also includes:

[0011] A plurality of temperature acquisition devices are provided, each of which is connected to a corresponding electromagnetic gate to acquire the temperature value of the corresponding electromagnetic gate, so that the corresponding first switch is disconnected under the control of the controller when the temperature value of the corresponding electromagnetic gate is greater than a preset temperature threshold.

[0012] Optional, also includes:

[0013] A plurality of magnetoresistive detection devices are provided, each of which is connected to the coil of a corresponding electromagnetic gate and is used to collect the magnetoresistive value of the coil of the corresponding electromagnetic gate, so that the corresponding first switch is disconnected under the control of the controller when the magnetoresistive value of the coil of the corresponding electromagnetic gate is greater than a preset magnetoresistive threshold.

[0014] Optional, also includes:

[0015] Several current acquisition devices are provided, with the current acquisition terminal of each current acquisition device connected to the second terminal of the corresponding first switch and the output terminal connected to the controller. They are used to acquire the current value of the circuit where the corresponding electromagnetic gate is located, so that the corresponding first switch is disconnected based on the control of the controller when the current value of the circuit where the corresponding electromagnetic gate is located is greater than a preset temperature threshold.

[0016] Optional, also includes:

[0017] A main switch, the first end of which is connected to the motor, and the second end of which is connected to the input end of each of the rectifiers.

[0018] Optional, also includes:

[0019] A protection device is provided, wherein a first end of the protection device is connected to the motor and a second end is connected to the input end of each of the rectifiers, and is used to disconnect when an overvoltage and / or overcurrent occurs in the circuit where the corresponding motor is located.

[0020] Optionally, the brake clearance measuring device is a feeler gauge, which is set within a preset distance range of the brake component of the corresponding electromagnetic gate, and is used to measure the brake clearance of the brake component of the corresponding solenoid valve.

[0021] Optionally, the brake gap measuring device includes: a laser measuring instrument and a processor that are vertically arranged within a preset distance range of the braking component of the corresponding electromagnetic gate;

[0022] The laser measuring instrument is used to emit a measuring laser into the braking gap of the braking component of the corresponding electromagnetic gate, and to receive the reflected measuring laser.

[0023] Optionally, the brake gap measuring device further includes: an infrared detection device disposed within a preset distance range of the laser measuring instrument and an ultrasonic sensor disposed within a preset distance range of the laser measuring instrument;

[0024] The infrared detection device is used to emit infrared light of a preset wavelength into the laser measuring instrument and to receive the reflected infrared light.

[0025] The ultrasonic sensor is used to transmit a first ultrasonic wave and a second ultrasonic wave to the laser measuring instrument and the electromagnetic gate, respectively, and to receive the reflected first ultrasonic wave and the reflected second ultrasonic wave.

[0026] To solve the above-mentioned technical problems, this utility model also provides a slab continuous casting machine protection system, including: a motor, a controller, and a slab continuous casting machine protection device as described above, wherein the slab continuous casting machine protection device is connected to the motor and the controller respectively.

[0027] The purpose of this invention is to provide a protection device and system for a slab continuous casting machine. Considering that when the slab continuous casting machine operates for a long time, the braking gap of the solenoid gate's braking component will change accordingly, and the change in braking gap will also lead to an increase in the operating voltage of the solenoid gate, this solution not only measures the braking gap of the corresponding solenoid valve's braking component through a braking gap measuring device, but also measures the voltage value of the circuit where the corresponding solenoid gate is located through a voltage acquisition device. It verifies the fault condition of the solenoid gate from two aspects at the same time, so that the controller can more accurately find the faulty solenoid gate and control the power supply circuit of the faulty solenoid gate to disconnect, so as to prevent some faulty solenoid gates from burning out the motor connected to them due to the change in their own braking gap. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0029] Figure 1A schematic diagram of the structure of a slab continuous casting machine provided by this utility model;

[0030] Figure 2 A schematic diagram of the structure of a protective device for a slab continuous casting machine provided by this utility model;

[0031] Figure 3 A schematic diagram of another protective device for a slab continuous casting machine provided by this utility model. Detailed Implementation

[0032] The core of this utility model is to provide a protection device and system for a slab continuous casting machine. This solution not only measures the braking gap of the braking component of the corresponding battery valve, but also measures the voltage value of the circuit where the corresponding solenoid gate is located. It verifies the fault condition of the solenoid gate from two aspects at the same time, so that the controller can more accurately find the faulty solenoid gate and control the disconnection of the power supply circuit where the faulty solenoid gate is located, so as to prevent the motor connected to the faulty solenoid gate from burning out due to the change of its own braking gap.

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] Please refer to Figure 2 , Figure 2 This utility model provides a structural schematic diagram of a protection device for a slab continuous casting machine. The protection device for the slab continuous casting machine includes: a plurality of rectifiers 1, an electromagnetic gate 2 in the same number as each rectifier 1, a first switch 3 in the same number as each rectifier 1, a voltage acquisition device 4 in the same number as each rectifier 1, and a brake gap measuring device 5 in the same number as each rectifier 1;

[0035] The input terminal of each rectifier 1 is connected to the motor, and the output terminal is connected to the first terminal of the corresponding first switch 3;

[0036] The voltage acquisition terminal of each voltage acquisition device 4 is connected to the second terminal of the corresponding first switch 3, and the output terminal is connected to the controller to acquire the voltage value of the circuit where the corresponding electromagnetic gate 2 is located.

[0037] Each brake gap measuring device 5 is set within a preset distance range of the brake component of the corresponding electromagnetic gate 2, and is used to measure the brake gap of the brake component of the corresponding solenoid valve.

[0038] The second end of each first switch 3 is connected to the corresponding electromagnetic gate 2, and the control end is connected to the controller. It is used to disconnect the circuit based on the controller when the voltage value of the circuit where each electromagnetic gate 2 is located is greater than the preset voltage threshold and / or the braking gap of the braking component of each electromagnetic gate 2 is greater than the preset braking gap threshold.

[0039] In this invention, considering that the braking gap of the braking component of the electromagnetic gate 2 will change when the slab continuous casting machine operates for a long time, and the change in braking gap will also lead to an increase in the operating voltage of the electromagnetic gate 2, this solution sets up a voltage acquisition device 4, a braking gap measuring device 5, and a first switch 3, which are the same number as the rectifiers 1 in the slab continuous casting machine. The voltage acquisition device 4 can acquire the voltage value of the circuit where the corresponding electromagnetic gate 2 is located, and the braking gap measuring device 5 can measure the braking gap of the braking component of the corresponding solenoid valve. The controller can accurately determine whether the corresponding electromagnetic gate 2 is faulty by acquiring the voltage value and the braking gap. That is, when the voltage value of the circuit where the electromagnetic gate 2 is located is greater than the preset voltage threshold and / or the braking gap of the braking component of the electromagnetic gate 2 is greater than the preset braking gap threshold, the controller determines that the corresponding electromagnetic gate 2 is faulty. In order to prevent the faulty electromagnetic gate 2 from burning out the motor connected to it, the controller will control the first switch 3 on the circuit where the faulty electromagnetic gate 2 is located to be disconnected, thus ensuring the safety of each component in the circuit.

[0040] This embodiment provides a protection device for a slab continuous casting machine. Considering that when the slab continuous casting machine operates for a long time, the braking gap of the braking component of the electromagnetic gate 2 will change accordingly, and the change in the braking gap will also lead to an increase in the operating voltage of the electromagnetic gate 2, this solution not only measures the braking gap of the corresponding solenoid valve's braking component through the braking gap measuring device 5, but also measures the voltage value of the circuit where the corresponding electromagnetic gate 2 is located through the voltage acquisition device 4. The fault condition of the electromagnetic gate 2 is verified from two aspects at the same time, so that the controller can more accurately find the faulty electromagnetic gate 2 and control the power supply circuit of the faulty electromagnetic gate 2 to disconnect, so as to prevent the motor connected to the faulty electromagnetic gate 2 from burning out due to the change in its own braking gap.

[0041] Based on the above embodiments:

[0042] As an optional embodiment, it also includes:

[0043] Several temperature acquisition devices are connected to the corresponding electromagnetic gate 2 to acquire the temperature value of the corresponding electromagnetic gate 2, so that the corresponding first switch 3 will disconnect based on the controller when the temperature value of the corresponding electromagnetic gate 2 is greater than the preset temperature threshold.

[0044] In this invention, considering that long-term operation of the electromagnetic gate 2 leads to wear, loosening, or thermal deformation of the braking components, causing the gap of the braking components to exceed the preset range, when the braking gap of the electromagnetic gate 2 increases, the magnetic resistance of the electromagnetic gate 2's magnetic circuit will increase. Therefore, in order to maintain the braking force of the electromagnetic gate 2, it is necessary to increase the current in the power supply circuit of the electromagnetic gate 2, which will lead to an increase in the temperature of the electromagnetic gate 2. Therefore, in order to accurately detect the fault condition of the electromagnetic gate 2, this solution also needs to set up temperature acquisition devices with the same number as the rectifier 1. The temperature of the corresponding electromagnetic gate 2 is collected by the temperature acquisition devices so that the controller can control the first switch 3 corresponding to the faulty electromagnetic gate 2 to open when the temperature value of the corresponding electromagnetic gate 2 is greater than the preset temperature threshold, to prevent the faulty electromagnetic gate 2 from burning out the motor connected to it, and to ensure the safety of each device in the circuit.

[0045] As an optional embodiment, it also includes:

[0046] Several magnetoresistive detection devices are connected to the coil of the corresponding electromagnetic gate 2 to collect the magnetoresistive value of the coil of the corresponding electromagnetic gate 2, so that the corresponding first switch 3 will disconnect based on the controller when the magnetoresistive value of the coil of the corresponding electromagnetic gate 2 is greater than a preset magnetoresistive threshold.

[0047] In this invention, considering that long-term operation of the electromagnetic gate 2 can lead to wear, loosening, or thermal deformation of the braking components, causing the gap of the braking components to exceed the preset range, and that the increase in the braking gap of the electromagnetic gate 2's braking components will cause the magnetic resistance of the electromagnetic gate 2's magnetic circuit to rise, this solution requires the same number of magnetic resistance detection devices as the rectifier 1 to accurately detect the fault condition of the electromagnetic gate 2. The magnetic resistance detection devices collect the magnetic resistance value corresponding to the coil of the electromagnetic gate 2, so that the controller can control the first switch 3 corresponding to the faulty electromagnetic gate 2 to open when the magnetic resistance value corresponding to the coil of the electromagnetic gate 2 is greater than the preset magnetic resistance threshold, thereby preventing the faulty electromagnetic gate 2 from burning out the motor connected to it and ensuring the safety of each device in the circuit.

[0048] As an optional embodiment, it also includes:

[0049] Several current acquisition devices are provided. The current acquisition end of each current acquisition device is connected to the second end of the corresponding first switch 3, and the output end is connected to the controller. They are used to acquire the current value of the circuit where the corresponding electromagnetic gate 2 is located, so that the corresponding first switch 3 will disconnect based on the controller's control when the current value of the circuit where the corresponding electromagnetic gate 2 is located is greater than a preset temperature threshold.

[0050] In this invention, considering that long-term operation of the electromagnetic gate 2 leads to wear, loosening, or thermal deformation of the braking components, causing the gap of the braking components to exceed the preset range, when the braking gap of the electromagnetic gate 2's braking components increases, the magnetic reluctance of the electromagnetic gate 2's magnetic circuit will increase. Therefore, in order to maintain the braking force of the electromagnetic gate 2, it is necessary to increase the current in the electromagnetic gate 2's power supply circuit. Thus, in order to accurately detect the fault condition of the electromagnetic gate 2, this solution also requires the same number of current acquisition devices as the rectifier 1. The current acquisition devices acquire the current value of the circuit corresponding to the electromagnetic gate 2, so that when the current value of the circuit corresponding to the electromagnetic gate 2 is greater than the preset temperature threshold, the controller controls the first switch 3 corresponding to the faulty electromagnetic gate 2 to open, preventing the faulty electromagnetic gate 2 from burning out the motor connected to it, and ensuring the safety of each component in the circuit.

[0051] As an optional embodiment, it also includes:

[0052] The main switch 6 has its first end connected to the motor and its second end connected to the input end of each rectifier 1.

[0053] In this utility model, considering that the slab continuous casting machine may need to be stopped urgently due to the operator's personal circumstances during the continuous casting of molten steel into slabs, a main switch 6 is added to facilitate disconnecting the power supply circuit of the electromagnetic switch 2. Figure 3 As shown, the power supply circuits of all electromagnetic gates 2 can be controlled to be turned on and off by controlling the opening and closing of the main switch 6, which is convenient for users or operators in practical applications.

[0054] As an optional embodiment, it also includes:

[0055] The protection device 7 has a first end connected to the motor and a second end connected to the input end of each rectifier 1. It is used to disconnect when an overvoltage and / or overcurrent occurs in the circuit where the corresponding motor is located.

[0056] In this invention, considering that the output voltage or output current of the motor may fluctuate due to environmental factors during operation, which may lead to overvoltage and / or overcurrent in the motor circuit, this solution is equipped with a protection device 7 to protect the safety of the motor circuit. When overvoltage and / or overcurrent occurs in the motor circuit, the device will disconnect to ensure the safety of all electronic components in the motor circuit.

[0057] As an optional embodiment, the brake clearance measuring device 5 is a feeler gauge, which is set within a preset distance range of the brake component of the corresponding solenoid gate 2, and is used to measure the brake clearance of the brake component of the corresponding solenoid valve.

[0058] In this invention, a feeler gauge can be inserted into the braking gap of the braking component of the electromagnetic gate 2, and the size of the braking gap can be accurately measured simply by pushing the feeler gauge, thereby accurately measuring the braking gap of the braking component of the electromagnetic gate 2. Furthermore, the feeler gauge can be inserted into different positions within the braking gap, and multiple measurements can be taken by moving the feeler gauge up and down within the braking gap of the braking component to determine whether there are uneven changes in the braking gap of the braking component based on the average value of the collected braking gap measurements.

[0059] As an optional embodiment, the brake gap measuring device 5 includes: a laser measuring instrument and a processor that are vertically disposed within a preset distance range of the braking component of the corresponding electromagnetic gate 2;

[0060] A laser measuring instrument is used to emit a measuring laser into the braking gap of the braking component of the corresponding electromagnetic gate 2, and to receive the reflected measuring laser.

[0061] In this invention, considering that the laser measuring instrument can calculate the braking gap of the braking component by measuring the time of laser reflection or scattering by emitting laser, a laser measuring device is selected to set the braking gap of the braking component of the vertical electromagnetic gate 2. The controller can determine the braking gap of the braking component based on the time taken from the laser measuring device emitting the measuring laser to receiving the reflected laser, thus ensuring the integrity of the solution.

[0062] As an optional embodiment, the brake gap measuring device 5 further includes: an infrared detection device and an ultrasonic sensor disposed within a preset distance range of the laser measuring instrument;

[0063] An infrared detection device is used to emit infrared light of a preset wavelength into a laser measuring instrument and to receive the reflected infrared light.

[0064] An ultrasonic sensor is used to transmit a first ultrasonic wave and a second ultrasonic wave to the laser measuring instrument and the electromagnetic gate 2, respectively, and to receive the reflected first ultrasonic wave and the reflected second ultrasonic wave.

[0065] In this invention, considering that for a laser measuring instrument to accurately measure the braking gap of the braking component of the electromagnetic gate 2, it must emit a measuring laser perpendicularly, meaning the position of the laser measuring instrument must be perpendicular to the braking gap of the braking component. To measure in real time whether the laser measuring device maintains a perpendicular relationship with the braking gap of the braking component, this solution adds an infrared detection device and an ultrasonic sensor. The infrared detection device emits infrared light of a preset wavelength to the laser measuring instrument and receives the reflected infrared light. The processor can detect the material and texture of the laser measuring instrument's surface based on the reflected infrared light, thus first identifying the measuring object as the laser measuring instrument. The ultrasonic sensor emits a first ultrasonic wave and a second ultrasonic wave to the laser measuring instrument and the electromagnetic gate 2 respectively, and receives the reflected first ultrasonic wave and the reflected second ultrasonic wave. The processor determines the position and orientation of the laser measuring instrument and the electromagnetic gate 2 based on the reflected first ultrasonic wave and the reflected second ultrasonic wave, thereby accurately determining whether the laser measuring device maintains a perpendicular relationship with the braking gap of the braking component, improving the accuracy and reliability of the solution.

[0066] This utility model also provides an embodiment of a protection system for a slab continuous casting machine, including: a motor, a controller, and a slab continuous casting machine protection device as described above, wherein the slab continuous casting machine protection device is connected to the motor and the controller respectively.

[0067] The slab continuous casting machine protection system provided in this embodiment corresponds to the slab continuous casting machine protection device described above, and therefore has the same beneficial effects as the slab continuous casting machine protection device described above. Therefore, for the embodiment of the slab continuous casting machine protection system, please refer to the description of the embodiment of the slab continuous casting machine protection device, which will not be repeated here.

[0068] It should be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0069] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A protective device for a slab continuous casting machine, characterized in that, include: A plurality of rectifiers, an electromagnetic gate of the same number as each of the rectifiers, a first switch of the same number as each of the rectifiers, a voltage acquisition device of the same number as each of the rectifiers, and a brake gap measuring device of the same number as each of the rectifiers; The input terminal of each rectifier is connected to the motor, and the output terminal is connected to the first terminal of the corresponding first switch; The voltage acquisition terminal of each voltage acquisition device is connected to the second terminal of the corresponding first switch, and the output terminal is connected to the controller, for acquiring the voltage value of the circuit where the corresponding electromagnetic gate is located; Each of the aforementioned brake gap measuring devices is set within a preset distance range of the brake component of the corresponding electromagnetic gate, and is used to measure the brake gap of the brake component of the corresponding battery valve; The second end of each of the first switches is connected to the corresponding electromagnetic gate, and the control end is connected to the controller. It is used to disconnect the switch based on the control of the controller when the voltage value of the circuit where each electromagnetic gate is located is greater than a preset voltage threshold and / or the braking gap of the braking component of each electromagnetic gate is greater than a preset braking gap threshold.

2. The slab continuous casting machine protection device as described in claim 1, characterized in that, Also includes: A plurality of temperature acquisition devices are provided, each of which is connected to a corresponding electromagnetic gate to acquire the temperature value of the corresponding electromagnetic gate, so that the corresponding first switch is disconnected under the control of the controller when the temperature value of the corresponding electromagnetic gate is greater than a preset temperature threshold.

3. The slab continuous casting machine protection device as described in claim 1, characterized in that, Also includes: A plurality of magnetoresistive detection devices are provided, each of which is connected to the coil of a corresponding electromagnetic gate and is used to collect the magnetoresistive value of the coil of the corresponding electromagnetic gate, so that the corresponding first switch is disconnected under the control of the controller when the magnetoresistive value of the coil of the corresponding electromagnetic gate is greater than a preset magnetoresistive threshold.

4. The slab continuous casting machine protection device as described in claim 1, characterized in that, Also includes: Several current acquisition devices are provided, with the current acquisition terminal of each current acquisition device connected to the second terminal of the corresponding first switch and the output terminal connected to the controller. They are used to acquire the current value of the circuit where the corresponding electromagnetic gate is located, so that the corresponding first switch is disconnected based on the control of the controller when the current value of the circuit where the corresponding electromagnetic gate is located is greater than a preset temperature threshold.

5. The slab continuous casting machine protection device as described in claim 1, characterized in that, Also includes: A main switch, the first end of which is connected to the motor, and the second end of which is connected to the input end of each of the rectifiers.

6. The slab continuous casting machine protection device as described in claim 1, characterized in that, Also includes: A protection device is provided, wherein a first end of the protection device is connected to the motor and a second end is connected to the input end of each of the rectifiers, and is used to disconnect when an overvoltage and / or overcurrent occurs in the circuit where the corresponding motor is located.

7. The slab continuous casting machine protection device as described in any one of claims 1 to 6, characterized in that, The brake clearance measuring device is a feeler gauge, which is set within a preset distance range of the brake component of the corresponding electromagnetic gate and is used to measure the brake clearance of the brake component of the corresponding solenoid valve.

8. The slab continuous casting machine protection device as described in any one of claims 1 to 6, characterized in that, The brake gap measuring device includes: a laser measuring instrument and a processor that are vertically arranged within a preset distance range of the braking component of the corresponding electromagnetic gate; The laser measuring instrument is used to emit a measuring laser into the braking gap of the braking component of the corresponding electromagnetic gate, and to receive the reflected measuring laser.

9. The slab continuous casting machine protection device as described in claim 8, characterized in that, The brake gap measuring device further includes: an infrared detection device disposed within a preset distance range of the laser measuring instrument and an ultrasonic sensor disposed within a preset distance range of the laser measuring instrument; The infrared detection device is used to emit infrared light of a preset wavelength into the laser measuring instrument and to receive the reflected infrared light. The ultrasonic sensor is used to transmit a first ultrasonic wave and a second ultrasonic wave to the laser measuring instrument and the electromagnetic gate, respectively, and to receive the reflected first ultrasonic wave and the reflected second ultrasonic wave.

10. A protection system for a slab continuous casting machine, characterized in that, include: The slab continuous casting machine protection device as described in any one of claims 1 to 9 is provided, wherein the slab continuous casting machine protection device is connected to the motor and the controller respectively.

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