Steel ladle top slag thickness measuring device

Abstract

The utility model relates to a steel ladle top slag thickness measuring device which comprises a temperature measuring gun, a slag thickness probe, a laser generator, a control system, a stepping motor, a lead screw, an encoder and a proximity switch. The proximity switch is arranged at a detection position where the temperature measuring gun mechanical arm rotates to a preset position, a signal line of the proximity switch is connected to the control system, an IO port of the control system is connected with the stepping motor and the laser generator, the lead screw is arranged on a rotating output shaft of the stepping motor, the encoder is arranged at the tail of the lead screw, and the laser generator is arranged on the tail of the lead screw. The laser generator is arranged on the lead screw, and a laser beam of the laser generator and the slag thickness probe rotating to the preset position are located on the same plane and are perpendicular to each other in direction; the thickness of the top slag can be automatically and accurately measured, human participation is not needed, interference is avoided, the safety operation problem of operators is also avoided, and the device is simple, easy to implement and easy to popularize.

Description

Technical Field

[0001] This utility model relates to the field of steelmaking technology, and in particular to a device for measuring the thickness of top slag in a steel ladle. Background Technology

[0002] The measurement data of top slag thickness is a key technical indicator for blast furnace ladles, refining RH and LF furnaces, and continuous casting tundishes. It is related to product quality and production costs. Especially in the refining process, the viscosity, thickness, adhesion, and composition of the refining slag have a significant impact on the cleanliness of the molten steel in the refining furnace. Throughout the refining process, the characteristics of the refining slag change due to the reaction with the steel and the addition of slag materials. In the early stage of refining, the required refining slag should have good fluidity. With vigorous stirring, this results in very high slag-steel interface activity and a high desulfurization rate. After the molten steel is desulfurized, the viscosity and thickness of the refining slag change significantly. Therefore, real-time measurement of the refining top slag thickness directly affects the smooth operation of automated refining. In continuous casting production, slag added to the ladle will worsen the castability of the molten steel, cause nozzle blockage, and lead to the oxidation of alloying elements, resulting in inclusions and affecting the purity of the molten steel. In severe cases, it can lead to abnormal corrosion of refractory materials, "shelling" and "welding rods" in the tundish, and production interruption. Therefore, the measurement of tundish slag thickness is one of the indicators that technicians pay close attention to. Summary of the Invention

[0003] This utility model provides a ladle top slag thickness measuring device, which realizes automatic and accurate measurement of top slag thickness without human intervention, avoids interference, and avoids safety issues for operators. The device is simple, easy to implement, and easy to promote.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A ladle top slag thickness measuring device includes a temperature measuring gun, a slag thickness probe, a laser generator, a control system, a stepper motor, a lead screw, an encoder, and a proximity switch. The slag thickness probe is mounted on a robotic arm with a rotating shaft of the temperature measuring gun. The proximity switch is positioned at a detection position where the robotic arm of the temperature measuring gun rotates to a preset position. The signal line of the proximity switch is connected to the control system. The I / O port of the control system is connected to the stepper motor and the laser generator. The lead screw is mounted on the output shaft of the stepper motor. The encoder is located at the tail of the lead screw. The laser generator is mounted on the lead screw. The laser beam of the laser generator is in the same plane and perpendicular to the direction of the slag thickness probe that has rotated to the preset position.

[0006] Furthermore, it also includes a slider, which is mounted on the lead screw and moves synchronously with the lead screw, and the laser generator is mounted on the slider.

[0007] Furthermore, the slag thickness probe includes a steel pipe and a slag breaking head. The slag breaking head is made of steel pipe, and the outer layer of the slag breaking head is coated with a refractory coating with a melting point lower than the temperature of the top slag of the ladle.

[0008] Furthermore, the control system includes a PLC, a digital I / O module, an analog I / O module, and a high-speed counter. The temperature signal line of the temperature measuring gun and the signal line of the stepper motor are connected to the analog I / O module, the encoder is connected to the high-speed counter, and the signal lines of the laser generator, the stepper motor, and the proximity switch are connected to the digital I / O module.

[0009] Furthermore, the length of the slag thickness probe is 130-150cm, and the length of the slag breaking head is 30-50cm.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] 1) The entire probe installation and testing process is standardized, resulting in high testing accuracy;

[0012] 2) No human intervention is required, avoiding interference and operator safety issues, and enabling automatic and accurate measurement of top slag thickness;

[0013] 3) The device has a unique structural design, low cost, adapts to the trend of unmanned and automated operation in the metallurgical industry, and is easy to implement and promote. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 This is a schematic diagram showing the relative positions of the slag thickness probe and the laser generator described in this utility model.

[0016] In the diagram: 1. Temperature measuring gun; 2. Slag breaking head; 3. Laser generator; 4. Stepper motor; 5. Lead screw; 6. Proximity switch; 7. Steel pipe; 8. Slider; 9. Laser beam. Detailed Implementation

[0017] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings:

[0018] See Figure 1This is a schematic diagram of the structure of this utility model. This utility model discloses a ladle top slag thickness measuring device, including a temperature measuring gun 1, a slag thickness probe, a laser generator 3, a control system, a stepper motor 4, a lead screw 5, an encoder, a slider 8, and a proximity switch 6. The slag thickness probe is mounted on a robotic arm with a rotating shaft of the temperature measuring gun 1. The proximity switch 6 is positioned at a detection position where the robotic arm of the temperature measuring gun 1 has rotated to a preset position. The signal line of the proximity switch 6 is connected to the control system. The I / O port of the control system is connected to the stepper motor 4 and the laser generator 3. The lead screw 5 is mounted on the output shaft of the stepper motor 4. The encoder is located at the tail of the lead screw 5. The slider 8 is mounted on the lead screw 5 and moves synchronously with it. The laser generator 3 is mounted on the slider 8. The laser beam 9 of the laser generator 3 is on the same plane and perpendicular to the direction of the slag thickness probe rotated to the preset position.

[0019] See Figure 2 The slag thickness probe includes a steel pipe 7 and a slag breaking head 2. The slag breaking head 2 is made of steel pipe and has a refractory coating on its outer layer with a melting point lower than the temperature of the top slag of the ladle. The slag thickness probe is 130cm long and the slag breaking head 2 is 30cm long.

[0020] The control system includes a PLC, a digital I / O module, an analog I / O module, and a high-speed counter. The temperature signal line of the temperature gun 1 and the signal line of the stepper motor 4 are connected to the analog I / O module. The encoder is connected to the high-speed counter. The signal lines of the laser generator 3, the stepper motor 4, and the proximity switch 6 are connected to the digital I / O module.

[0021] Working principle: The robotic arm of the temperature measuring gun 1 is equipped with a slag thickness probe. The temperature measuring gun 1 automatically rotates the robotic arm to insert the slag thickness probe into the molten steel for 3-5 seconds. The rotating robotic arm then moves the slag thickness probe out of the molten steel to a preset position. The color of the slag breaking head 2 of the slag thickness probe changes, indicating that the part in contact with the molten steel melts. The coating on the surface of the part in contact with the slag changes color, while the part not inserted remains unchanged. The robotic arm rotates to the preset position and triggers the proximity switch 6 of the detection position. The PLC outputs a control signal, the stepper motor 4 rotates, and drives the lead screw 5 to run. The laser generator 3 scans and detects along the slag breaking head 2 under the drive of the lead screw 5. When the color change of the slag breaking head 2 is detected, a timer is triggered to start. The timer stops when the slag breaking head 2 is melted. The length of the slag breaking head 2 inserted into the slag is calculated by combining the encoder and the speed of the stepper motor 4. Then, the thickness of the top slag of the ladle is calculated based on the insertion angle of the slag thickness probe.

[0022] The above embodiments are implemented based on the technical solution of this utility model, providing detailed implementation methods and specific operation processes. However, the protection scope of this utility model is not limited to the above embodiments. Unless otherwise specified, the methods used in the above embodiments are conventional methods.

Claims

1. A device for measuring the thickness of top slag in a steel ladle, characterized in that, The device includes a temperature measuring gun, a slag thickness probe, a laser generator, a control system, a stepper motor, a lead screw, an encoder, and a proximity switch. The slag thickness probe is mounted on a robotic arm with a rotating shaft of the temperature measuring gun. The proximity switch is positioned at a detection position where the robotic arm of the temperature measuring gun has rotated to a preset position. The signal line of the proximity switch is connected to the control system. The I / O port of the control system is connected to the stepper motor and the laser generator. The lead screw is mounted on the output shaft of the stepper motor. The encoder is located at the tail of the lead screw. The laser generator is mounted on the lead screw. The laser beam of the laser generator is on the same plane and perpendicular to the direction of the slag thickness probe that has rotated to the preset position.

2. The ladle top slag thickness measuring device according to claim 1, characterized in that, It also includes a slider, which is mounted on a lead screw and moves synchronously with the lead screw, and the laser generator is mounted on the slider.

3. The ladle top slag thickness measuring device according to claim 1, characterized in that, The slag thickness probe includes a steel pipe and a slag breaking head. The slag breaking head is made of steel pipe and has a refractory coating on its outer layer with a melting point lower than that of the top slag of the ladle.

4. The ladle top slag thickness measuring device according to claim 1, characterized in that, The control system includes a PLC, a digital I / O module, an analog I / O module, and a high-speed counter. The temperature signal line of the temperature measuring gun and the signal line of the stepper motor are connected to the analog I / O module. The encoder is connected to the high-speed counter. The signal lines of the laser generator, the stepper motor, and the proximity switch are connected to the digital I / O module.

5. The ladle top slag thickness measuring device according to claim 1, characterized in that, The length of the slag thickness probe is 130-150cm, and the length of the slag breaking head is 30-50cm.

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