Automatic protection device for radar stock rod of blast furnace

Abstract

The utility model discloses an automatic protection device for a radar stock rod of a blast furnace, the top of the blast furnace is connected with a vertical outer protection tube, and a radar antenna is connected to the top of the outer protection tube through a flange structure; the upper part of the tube wall of the outer protection tube is connected with a temperature measurement thermal resistor, the temperature measurement thermal resistor is mounted on a thermal resistor mounting base, and the thermal resistor mounting base is welded on the outer protection tube; the middle part of the pipe wall of the outer protection pipe is connected with first purging nitrogen and second purging nitrogen, the first purging nitrogen and the second purging nitrogen are used for blowing nitrogen into the outer protection pipe, and the first purging nitrogen and the second purging nitrogen are respectively connected with a nitrogen valve and a pressure sensor; a gate valve is connected to the lower part of the pipe wall of the outer protection pipe and is used for sealing the outer protection pipe and preventing dust in the blast furnace from entering the outer protection pipe; the device further comprises a control system which is connected with the temperature measuring thermal resistor and the gate valve, and the control system controls nitrogen purging.

Description

Technical Field

[0001] This utility model belongs to the technical field of blast furnace auxiliary equipment, specifically relating to an automatic protection device for blast furnace radar probes. Background Technology

[0002] The blast furnace radar gauge adopts a non-contact measurement method, which features high accuracy, large measurement range, simple installation, and reliable use. In principle, it is not limited by temperature, pressure, steam, mist, and dust, and is suitable for various harsh environments with high temperature, high pressure, and strong corrosion. It emits microwaves to the surface of the measured medium through a radar antenna, then measures the running time of microwave emission and reflection, and obtains the material level in the blast furnace through intelligent signal processing.

[0003] Blast furnace radar probes operate in a high-temperature, high-pressure, and dusty environment for extended periods. The main problems encountered during operation include: ① Low pressure in the purging nitrogen source or interruption of nitrogen supply, causing dust to adhere to the radar antenna and transmission channels, resulting in weakened signals and inaccurate measurements. ② Abnormal environmental conditions around the radar antenna, such as increased temperature, lead to signal anomalies and inaccurate measurements. This prevents the radar probe from accurately detecting the material level inside the furnace, affecting blast furnace charging operations, and in severe cases, causing low material levels and reduced blast. ③ During blast furnace maintenance, the purging nitrogen supply is interrupted. To prevent dust adhesion to the radar antenna or damage from high temperatures, maintenance personnel must disassemble the radar probe. Improper installation during reinstallation can also prevent measurements, requiring readjustment, resulting in significant daily maintenance workload. ④ During normal blast furnace production, if a radar probe malfunctions, it cannot be disassembled under pressure, making maintenance impossible, and the malfunction may persist for an extended period. Therefore, it is necessary to design an automatic protection device for blast furnace radar probes that can ensure the stable operation of radar probes, activate the protection device in a timely manner to perform maintenance in case of abnormalities, ensure that the radar antenna is not damaged, accurately identify faults and take measures to deal with them, and at the same time reduce the amount of daily maintenance and reduce labor. Utility Model Content

[0004] This utility model provides an automatic protection device for blast furnace radar probes, which can not only ensure the stable operation of radar probes, but also activate the protection device in time to perform maintenance in case of abnormalities, ensuring that the radar antenna is not damaged. It can also accurately identify faults and take measures to deal with them, while reducing daily maintenance and labor.

[0005] Therefore, the present invention adopts the following technical solution:

[0006] An automatic protection device for a blast furnace radar probe, wherein a vertical outer protective pipe is connected to the top of the blast furnace, and a radar antenna is connected to the top of the outer protective pipe through a flange structure.

[0007] A temperature measuring resistance thermometer is connected to the upper part of the outer protective tube wall. The temperature measuring resistance thermometer is installed on the resistance thermometer mounting base, which is welded to the outer protective tube.

[0008] The outer protective tube has a first purge nitrogen gas and a second purge nitrogen gas connected in the middle of its wall. The first purge nitrogen gas and the second purge nitrogen gas are used to purge nitrogen into the outer protective tube. The first purge nitrogen gas and the second purge nitrogen gas are respectively connected to a nitrogen valve and a pressure sensor.

[0009] A slide gate valve is connected to the lower part of the outer protective pipe wall. The slide gate valve is used to seal the outer protective pipe to prevent dust from the blast furnace from entering the outer protective pipe.

[0010] It also includes a control system, which connects the temperature measuring resistance thermometer and the gate valve, and controls the purging nitrogen gas.

[0011] Furthermore, the first and second purge nitrogen gases are arranged opposite each other and staggered vertically.

[0012] Furthermore, the slide gate valve is controlled by a pneumatic structure.

[0013] Furthermore, the pneumatic structure includes an air source, which is connected to the air inlet of a two-position five-way solenoid valve through an air source valve, and the air outlet is connected to the upper cylinder air source inlet and the lower cylinder air source inlet, respectively; then the cylinder piston rod and the protective insert are fastened with a locking nut, and the upper sealing cover, sealing gasket and lower sealing cover are fastened with a second fixing screw, then the cylinder is welded to the protective device, and finally the gap at the contact point between the protective device and the outer protective tube is welded.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. Equipped with a built-in temperature-sensing resistance thermometer, it can detect the ambient temperature around the radar antenna in real time, avoiding the failure to detect abnormalities in the surrounding environment in time, which could cause the radar antenna to burn out.

[0016] 2. Install a pressure sensor on the nitrogen gas supply line to monitor the pressure of the purging gas source in real time. This will help detect any problems with the gas source in a timely manner and prevent insufficient gas source pressure from causing dust to adhere to the radar antenna and transmission channel, resulting in inaccurate measurements.

[0017] 3. Reduce unnecessary disassembly and assembly work during routine maintenance to avoid malfunctions caused by improper disassembly and assembly, thereby reducing the amount of daily maintenance and labor costs;

[0018] 4. The automatic protection device can automatically activate when the temperature or pressure is abnormal, blocking the rising airflow of high temperature and high pressure inside the blast furnace to protect the radar probe.

[0019] 5. During normal blast furnace production, the protection device can be manually activated to perform routine maintenance and troubleshooting on the radar probe. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the automatic protection device of this utility model;

[0021] Figure 2 This is a structural diagram of an automatic protection device;

[0022] In the diagram: 1—Radar housing and electronic components; 2—Process connector; 3—Radar antenna; 4—Upper sealing flange; 5—First fixing screw; 6—Lower sealing flange; 7—Temperature measuring resistance thermometer; 8—Resistor mounting base; 9—First purging nitrogen; 10—First pressure sensor; 11—First purging nitrogen valve; 12—Second purging nitrogen valve; 13—Second pressure sensor; 14—Second purging nitrogen; 15—Gas source valve; 16—Two-position five-way solenoid valve; 17—Upper cylinder gas source inlet; 18—Lower cylinder gas source inlet; 19—Cylinder; 20—Cylinder piston; 21—Cylinder piston rod; 22—Locking nut; 23—Protective insert plate; 24—Protective device; 25—Second fixing screw; 26—Upper sealing cover; 27—Sealing gasket; 28—Lower sealing cover; 29—Outer protective tube; 30—High-temperature ore and rising airflow. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0024] like Figure 1 and 2 As shown, firstly, the radar housing and electronic components 1 are connected to the radar antenna 3 via the process connector 2 and installed on the upper sealing flange 4, then secured to the lower sealing flange 6 with the first fixing screw 5. Next, the temperature measuring resistor 7 is installed on the resistor mounting base 8, which is welded to the outer protective tube 29. The temperature measuring resistor 7 is then connected to the PLC. Next, the first purging nitrogen 9 and the second purging nitrogen 14 are introduced into the outer protective tube 29 through the first purging nitrogen valve 11 and the second purging nitrogen valve 12 to purge the radar transmission channel. The first pressure sensor 10 and the second pressure sensor 13 are installed on the purging pipe and connected to the PLC. Then, the air source is connected to the inlet of the two-position five-way solenoid valve 16 through the air source valve 15, and the outlet is connected to the upper cylinder air source inlet 17 and the lower cylinder air source inlet 18 of the cylinder 19. Next, tighten the cylinder piston rod 21 and the protective insert plate 23 with the lock nut, tighten the upper sealing cover 26, the sealing gasket 27 and the lower sealing cover 28 with the second fixing screw 25, then weld the cylinder 19 to the protective device 24, and finally weld the gap at the contact point between the protective device 24 and the outer protective tube 29.

[0025] Under normal operating conditions, the two-position five-way solenoid valve 16 is energized, the upper cylinder air inlet 17 is open, and the lower cylinder air inlet 18 is closed. Cylinder 19 drives the protective slide plate 23 to be closed. The radar probe measures the material level normally. When the temperature measured by the temperature measuring resistor 7 is >100℃, or the pressure measured by the pressure sensor 10 is <0.2MPa, or the pressure measured by the pressure sensor 13 is <0.2MPa, the PLC sends a command to activate the protection device. The two-position five-way solenoid valve 16 is de-energized, the upper cylinder air inlet 17 is closed, and the lower cylinder air inlet 18 is open. Cylinder 19 drives the protective slide plate 23 to open, inserting it into the outer protective tube 29 to block the high-temperature ore and rising airflow 30 in the blast furnace, preventing the radar antenna from burning out or dust from adhering to the transmission channel. At the same time, the PLC can also manually issue a command to manually activate the protection device 24 during normal blast furnace production for routine maintenance and repair of the radar probe.

Claims

1. An automatic protection device for a blast furnace radar probe, characterized in that, The top of the blast furnace is connected to a vertical outer protective pipe, and the radar antenna is connected to the top of the outer protective pipe through a flange structure. A temperature measuring resistance thermometer is connected to the upper part of the outer protective tube wall. The temperature measuring resistance thermometer is installed on the resistance thermometer mounting base, which is welded to the outer protective tube. The outer protective tube has a first purge nitrogen gas and a second purge nitrogen gas connected in the middle of its wall. The first purge nitrogen gas and the second purge nitrogen gas are used to purge nitrogen into the outer protective tube. The first purge nitrogen gas and the second purge nitrogen gas are respectively connected to a nitrogen valve and a pressure sensor. A slide gate valve is connected to the lower part of the outer protective pipe wall. The slide gate valve is used to seal the outer protective pipe to prevent dust from the blast furnace from entering the outer protective pipe. It also includes a control system, which connects the temperature measuring resistance thermometer and the gate valve, and controls the purging nitrogen gas.

2. The automatic protection device for blast furnace radar probes according to claim 1, characterized in that, The first and second purge nitrogen gases are arranged opposite each other and staggered vertically.

3. The automatic protection device for blast furnace radar probes according to claim 1, characterized in that, The slide gate valve is controlled by a pneumatic mechanism.

4. The automatic protection device for blast furnace radar probes according to claim 3, characterized in that, The pneumatic structure includes an air source, which is connected to the air inlet of a two-position five-way solenoid valve through an air source valve. The air outlet is connected to the upper cylinder air source inlet and the lower cylinder air source inlet, respectively. The cylinder piston rod and the protective insert are then fastened with a locking nut. The upper sealing cover, sealing gasket, and lower sealing cover are fastened with a second fixing screw. The cylinder is then welded to the protective device. Finally, the gap between the protective device and the outer protective tube is welded.

Images