Ironmaking pulverized coal bunker radar material level signal anti-interference device

Abstract

The utility model discloses a radar material level signal anti-interference device for an ironmaking pulverized coal bunker, and relates to the technical field of blast furnace ironmaking. According to the utility model, the surge protector is in a high-impedance state when no surge voltage occurs and is in a low-impedance state when voltage surge occurs, the GND of the radar level gauge is connected with the pulverized coal bunker main body, and then the pulverized coal bunker main body is grounded, so that static electricity generated by a steel cable of the radar level gauge can be gathered and released as soon as possible; according to the utility model, overvoltage generated by electrostatic interference can be effectively protected, and when peak current or voltage is suddenly generated by external interference, the surge protection device acts and is conducted and shunted in an extremely short time, so that the bottleneck problem on site is eliminated, the problem of measurement misalignment of a cable type radar level gauge is solved, and the potential safety hazard of electrostatic charge accumulation to a pulverized coal bunker is eliminated; therefore, smooth production of the ironmaking coal injection pulverizing system is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of blast furnace ironmaking, and particularly relates to an anti-interference device for radar level signals of a pulverized coal bin in ironmaking. Background Technique

[0002] Pulverized coal injection in ironmaking is a very important technological link in blast furnace ironmaking production, undertaking various functions such as pulverized coal preparation in the blast furnace and in-furnace injection. The pulverized coal prepared by each pulverized coal injection system is stored in a bin manner, and a German VAGE cable type radar level gauge is used for measuring the level of the pulverized coal bin. In the actual production process, due to the continuous scouring and friction of the steel cable of the radar level gauge by the suspended pulverized coal airflow in the bin, a large amount of static electricity accumulates. When the charge accumulates to a certain extent and cannot be released, it will cause the microwave echo signal of the radar level gauge to stop working, seriously affecting the real-time measurement of the level. Content of the Utility Model

[0003] In view of the above technical problems, the utility model provides an anti-interference device for radar level signals of a pulverized coal bin in ironmaking, which is used to solve the problem that after a large amount of static electricity accumulates in the pulverized coal bin by the radar level gauge, the microwave echo signal of the radar level gauge stops working, seriously affecting the real-time measurement of the level.

[0004] In order to achieve the above purpose, the technical solution of the utility model is specifically as follows:

[0005] An anti-interference device for radar level signals of a pulverized coal bin in ironmaking includes a radar level gauge and a pulverized coal bin. The radar level gauge is installed on the top of the pulverized coal bin, and also includes a surge protector, a computer control system, and a grounding busbar. The radar level gauge is connected to the surge protector through a signal line, the surge protector is connected to the computer control system through a detection transmission line, a signal transmission shielding layer is provided on the detection transmission line, a grounding electrode is provided on the ground surface, the first interface of the grounding busbar is connected to the grounding electrode, the second interface of the grounding busbar is connected to the signal transmission shielding layer, the third interface of the grounding busbar is connected to the metal bin wall of the pulverized coal bin, the metal bin wall of the pulverized coal bin is connected to the metal shell of the radar level gauge, and the metal shell of the radar level gauge is connected to the grounding wire of the surge protector.

[0006] Further, the model of the radar level gauge is a German VAGE cable type radar level gauge.

[0007] Further, the model of the surge protector is the AS24EX surge protector produced by Guangdong Anxun Lightning Protection Technology Co., Ltd.

[0008] Compared with the prior art, the beneficial effects of the present utility model are as follows: When there is no surge voltage, the surge protector presents a high impedance, and when a voltage surge appears, it changes to a low impedance state. Connect the GND of the radar level gauge to the main body of the coal powder bin, and then ground the main body of the coal powder bin, so that the static electricity accumulated by the steel cable of the radar level gauge can be released as soon as possible, and it can effectively protect against overvoltage caused by static electricity interference. When a sudden spike current or voltage occurs in the external interference, the surge protector acts, conducts and shunts in a very short time, eliminates the bottleneck problem on site, solves the problem of inaccurate measurement of the cable type radar level gauge, eliminates the potential safety hazard caused by the accumulation of static charges on the coal powder bin, and thus ensures the smooth production of the ironmaking pulverized coal injection system. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a structural schematic diagram of the present utility model;

[0010] In the figure:

[0011] 1, radar level gauge; 2, coal powder bin; 3, steel cable; 4, signal line; 6, surge protector; 7, detection and transmission line; 9, signal transmission shielding layer; 10, computer control system; 11, grounding busbar; 12, ground surface; 13, grounding electrode; 14, grounding wire; 15, weight; 16, first interface; 17, second interface; 18, third interface. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0012] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below in conjunction with the specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary and are not intended to limit the scope of the present utility model. In addition, in the following description, the descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present utility model.

[0013] An anti-interference device for radar level signals in a pulverized coal bin for ironmaking, comprising a radar level gauge 1 and a pulverized coal bin 2. The radar level gauge is installed on the top of the pulverized coal bin 2. It also includes a surge protector 6, a computer control system 10, and a grounding busbar 11. The radar level gauge is connected to the surge protector 6 through a signal line 4. The surge protector 6 is connected to the computer control system 10 through a detection transmission line 7. A signal transmission shielding layer 9 is provided on the detection transmission line 7. A grounding electrode 13 is provided on the ground surface 12. The first interface 16 of the grounding busbar 11 is connected to the grounding electrode 13. The second interface 17 of the grounding busbar 11 is connected to the signal transmission shielding layer 9. The third interface 18 of the grounding busbar 11 is connected to the metal bin wall of the pulverized coal bin 2. The metal bin wall of the pulverized coal bin 2 is connected to the metal housing of the radar level gauge 1. The metal housing of the radar level gauge 1 is connected to the grounding wire 14 of the surge protector 6. When there is no surge voltage in the surge protector 6, it presents a high impedance, and when a voltage surge appears, it changes to a low impedance state, connecting the GND of the radar level gauge 1 to the main body of the pulverized coal bin 2, and then grounding the main body of the pulverized coal bin 2, which can make the static electricity accumulation generated by the steel cable 3 of the radar level gauge 1 be released as soon as possible, and can effectively protect against overvoltage caused by static electricity interference. When a sudden spike current or voltage is generated by external interference, the surge protector 6 acts, conducts and shunts within a very short time, eliminates the bottleneck problem on site, solves the problem of inaccurate measurement of the cable-type radar level gauge 1, and eliminates the potential safety hazard caused by static charge accumulation to the pulverized coal bin 2, thus ensuring the smooth production of the ironmaking pulverized coal injection system.

[0014] The model of the radar level gauge is the German VAGE cable-type radar level gauge.

[0015] The model of the surge protector is the AS24EX surge protector produced by Guangdong Anxun Lightning Protection Technology Co., Ltd.

[0016] Embodiment

[0017] At the 1 / 2 radius of the upper end cover of the top of the pulverized coal bin 2, make an opening, weld a lower flange with a height of 100 mm and a diameter of 200 mm, and fixedly install the radar level gauge 1 on the lower flange. The steel cable 3 of the radar level gauge 1 is freely dropped into the pulverized coal bin 2 through the opening on the end cover under the gravity traction of the front weight 15. The measurement signal of the radar level gauge 1 is connected to the signal input side of the surge protector 6 through the signal line 4. The output signal of the surge protector 6 sends the level detection signal of the radar level gauge 1 to the computer control system 10 through the detection transmission line 7 for level monitoring and display of the pulverized coal bin 2. Make an independent grounding pit grounding electrode 13 for the measurement and control system on the ground surface 12, connect the signal transmission shielding layer 9 of the instrument transmission signal cable to the grounding busbar 11, and use a 4 mm with good metal conductivity 2The copper wire makes the grounding wire 14 connected to the metal shell of the radar level gauge 1, and the metal shell of the radar level gauge 1 is in turn connected to the metal wall of the pulverized coal bin 2, and finally connected to the grounding busbar 11 through the grounding wire 14. In this way, all the grounding systems in this design form an equipotential connection, which can effectively release the static electricity accumulation generated by the waveguide radar level steel cable 3 instantaneously and quickly.

[0018] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. An anti-interference device for radar level signals in a pulverized coal bin for ironmaking, comprising a radar level gauge (1) and a pulverized coal bin (2), the radar level gauge being installed on the top of the pulverized coal bin (2), and characterized in that: It also includes a surge protector (6), a computer control system (10) connected thereto, and a grounding busbar (11). The radar level gauge is connected to the surge protector (6) through a signal line (4). The surge protector (6) is connected to the computer control system (10) through a detection transmission line (7). A signal transmission shielding layer (9) is provided on the detection transmission line (7). A grounding electrode (13) is provided on the ground surface (12). The first interface (16) of the grounding busbar (11) is connected to the grounding electrode (13). The second interface (17) of the grounding busbar (11) is connected to the signal transmission shielding layer (9). The third interface (18) of the grounding busbar (11) is connected to the metal bin wall of the pulverized coal bin (2). The metal bin wall of the pulverized coal bin (2) is connected to the metal housing of the radar level gauge (1). The metal housing of the radar level gauge (1) is connected to the grounding wire (14) of the surge protector (6).

2. The anti-interference device for radar level signals of a pulverized coal bin for ironmaking according to claim 1, characterized in that: The model of the radar level gauge (1) is the cable type radar level gauge of VAGE in Germany.

3. The anti-interference device for radar level signals of a pulverized coal bin in iron smelting according to claim 1, characterized in that: The model of the surge protector (6) is the AS24EX surge protector produced by Guangdong Anxun Lightning Protection Technology Co., Ltd.

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