Gas supply system for galvanization air knife and galvanization thickness control system

Abstract

The utility model relates to a gas supply system for a galvanizing air knife, which comprises a gas supply main pipe, a first nitrogen supply pipe, a second nitrogen supply pipe, a first air supply pipe and a second air supply pipe, a nitrogen-air mixing station is arranged on the gas supply main pipe, and the first nitrogen supply pipe and the first air supply pipe are both connected with the nitrogen-air mixing station. The second nitrogen supply pipe and the second air supply pipe are connected to the air supply main pipe in a bypass mode, supply pipe bypass connection points are located on the downstream of the nitrogen-air mixing station, and control valves are arranged on the first nitrogen supply pipe, the second nitrogen supply pipe, the first air supply pipe, the second air supply pipe and the air supply main pipe respectively. And the control valve on the air supply main pipe is positioned between the nitrogen-air mixing station and the adjacent supply pipe side connection point. In addition, the utility model also relates to a galvanization thickness control system equipped with the gas supply system. The multi-mode working of the galvanizing air knife can be realized, the process flexibility and the application range of the galvanizing air knife are effectively improved, the surface quality of a strip steel galvanizing product is ensured, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to a gas supply system for a galvanizing air knife and a galvanizing thickness control system equipped with the gas supply system. Background Art

[0002] In the galvanizing production line of the metallurgical industry, the annealed strip is immersed in a hot zinc pot. When it comes out of the zinc pot, a layer of zinc liquid is attached to the surface of the strip. The specific thickness of the zinc layer depends on the walking speed and surface structure of the strip, but it will obviously exceed the required coating thickness. At this time, air knives are installed on both sides of the strip to spray air or nitrogen to remove excess zinc liquid to control the coating thickness.

[0003] The air knife with air as the medium has a lower cost, but the surface quality of the coating obtained is not high, which can meet the requirements of low-quality galvanized sheets. The air knife with nitrogen as the medium has a higher cost, but the surface quality of the coating obtained is higher, which can meet the higher requirements of galvanized automotive sheets and other sheets; at the same time, nitrogen air knives can also increase the speed of galvanizing strip. In order to save costs, a galvanizing production line often needs to be able to switch to produce galvanized sheets with different surface quality requirements. It is difficult to meet the production needs of multiple steel grades using air knives, and the use of nitrogen air knives will increase production costs. Utility Model Content

[0004] The utility model relates to a gas supply system for a galvanizing air knife and a galvanizing thickness control system equipped with the gas supply system, which can at least solve some defects of the prior art.

[0005] The utility model relates to a gas supply system for a galvanizing air knife, comprising a gas supply main pipe connected to the galvanizing air knife, and also comprising a first nitrogen supply pipe, a second nitrogen supply pipe, a first air supply pipe and a second air supply pipe, a nitrogen-air mixing station is arranged on the gas supply main pipe, the first nitrogen supply pipe and the first air supply pipe are both connected to the nitrogen-air mixing station, the second nitrogen supply pipe and the second air supply pipe are respectively connected to the gas supply main pipe, and the supply pipe side connection points are all located downstream of the nitrogen-air mixing station, the first nitrogen supply pipe, the second nitrogen supply pipe, the first air supply pipe, the second air supply pipe and the gas supply main pipe are respectively provided with control valves, and the control valve on the gas supply main pipe is located between the nitrogen-air mixing station and the adjacent supply pipe side connection points.

[0006] As one of the implementation modes, the nitrogen-air mixing station is provided with a heating unit for heating the gas.

[0007] As one of the implementation modes, the heating unit adopts an electric heating device.

[0008] As one of the implementation modes, the first nitrogen supply pipe and the second nitrogen supply pipe are both connected to an air separation plant.

[0009] As one of the implementation modes, the first nitrogen supply pipe and the second nitrogen supply pipe are both connected to a nitrogen main pipe, and the nitrogen main pipe is connected to a nitrogen source; a nitrogen buffer pipe is connected to the nitrogen main pipe, and the nitrogen buffer pipe is connected to a nitrogen buffer tank.

[0010] As one of the implementation modes, the first air supply pipe and the second air supply pipe are both connected to an air compression station.

[0011] As one of the implementation modes, the first air supply pipe and the second air supply pipe are both connected to a compressed air main pipe, and the compressed air main pipe is connected to a compressed air source; an air buffer pipe is connected to the compressed air main pipe, and the air buffer pipe is connected to a compressed air buffer tank.

[0012] The utility model also provides a galvanizing thickness control system, comprising a galvanizing air knife, and is also equipped with the above-mentioned gas supply system for the galvanizing air knife, wherein the gas supply main pipe is connected to the galvanizing air knife.

[0013] As one of the implementation modes, the galvanizing thickness control system is also equipped with a coating thickness gauge, and the coating thickness gauge is located downstream of the galvanizing air knife.

[0014] The utility model has at least the following beneficial effects:

[0015] In the utility model, nitrogen-air mixed gas can be supplied to the galvanizing air knife through a nitrogen-air mixing station, nitrogen can be supplied to the galvanizing air knife through a second nitrogen supply pipe, or compressed air can be supplied to the galvanizing air knife through a second air supply pipe, thereby realizing multi-mode operation of the galvanizing air knife, effectively improving the process flexibility and application scope of the galvanizing air knife, ensuring the surface quality of the galvanized steel strip products, and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic structural diagram of a gas supply system provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] like Figure 1 The utility model embodiment provides a gas supply system for a galvanizing air knife 1, comprising a gas supply main pipe 24 connected to the galvanizing air knife 1, the gas supply system further comprising a first nitrogen supply pipe 213, a second nitrogen supply pipe 214, a first air supply pipe 223 and a second air supply pipe 224, a nitrogen-air mixing station 23 is arranged on the gas supply main pipe 24, the first nitrogen supply pipe 213 and the first air supply pipe 223 are both connected to the nitrogen-air mixing station 23, the second nitrogen supply pipe 214 and the second air supply pipe 224 are respectively connected to the gas supply main pipe 24 and the supply pipe side connection points are all located downstream of the nitrogen-air mixing station 23, the first nitrogen supply pipe 213, the second nitrogen supply pipe 214, the first air supply pipe 223, the second air supply pipe 224 and the gas supply main pipe 24 are respectively provided with control valves, and the control valve on the gas supply main pipe 24 is located between the nitrogen-air mixing station 23 and the adjacent supply pipe side connection points.

[0020] In one embodiment, if Figure 1 The first nitrogen supply pipe 213 and the second nitrogen supply pipe 214 are both connected to a nitrogen main pipe, and the nitrogen main pipe is connected to a nitrogen source 211.

[0021] In one embodiment, if Figure 1 , the first air supply pipe 223 and the second air supply pipe 224 are both connected to a compressed air main pipe, and the compressed air main pipe is connected to a compressed air source 221;

[0022] The nitrogen source 211 includes but is not limited to an air separation plant, that is, the first nitrogen supply pipe 213 and the second nitrogen supply pipe 214 are both connected to the air separation plant.

[0023] The compressed air source 221 includes but is not limited to an air compression station, that is, the first air supply pipe 223 and the second air supply pipe 224 are both connected to the air compression station.

[0024] Furthermore, if Figure 1A nitrogen buffer pipe is connected to the nitrogen main pipe, and the nitrogen buffer pipe is connected to a nitrogen buffer tank 212. Control valves are provided on the nitrogen main pipe and the nitrogen buffer pipe, respectively, and the control valve on the nitrogen main pipe is located between the nitrogen source 211 and the nitrogen buffer pipe side connection point. By providing the nitrogen buffer tank 212, a certain amount of nitrogen can be buffered. In actual production, nitrogen can be selectively supplied through the nitrogen source 211 and the nitrogen buffer tank 212, which can improve the working reliability of the gas supply system.

[0025] Optionally, the control valves on the nitrogen main pipe and the nitrogen buffer pipe may be switch valves.

[0026] Furthermore, if Figure 1 , an air buffer pipe is connected to the compressed air main pipe, and the air buffer pipe is connected to a compressed air buffer tank 222. Control valves are provided on the compressed air main pipe and the air buffer pipe respectively, and the control valve on the compressed air main pipe is located between the compressed air source 221 and the air buffer pipe side connection point. By providing the compressed air buffer tank 222, a certain amount of compressed air can be buffered. In actual production, compressed air can be selectively supplied through the compressed air source 221 and the compressed air buffer tank 222, which can improve the working reliability of the gas supply system.

[0027] Optionally, the control valves on the compressed air main pipe and the air buffer pipe can be switch valves.

[0028] Optionally, the control valve on the first nitrogen supply pipe 213 may include a regulating valve and a check valve.

[0029] Optionally, the control valve on the second nitrogen supply pipe 214 may be a switch valve.

[0030] Optionally, the control valve on the first air supply pipe 223 may include a regulating valve and a check valve.

[0031] Optionally, the control valve on the second air supply pipe 224 may be a switch valve.

[0032] The nitrogen-air mixing ratio can be adjusted by the regulating valve on the first nitrogen supply pipe 213 and the regulating valve on the first air supply pipe 223 to ensure the stability of the air knife spray flow rate and spray pressure while saving costs as much as possible.

[0033] In one embodiment, the nitrogen-air mixing station 23 is provided with a heating unit for heating the gas, which can adjust the temperature of the mixed gas, ensure the working reliability of the galvanizing air knife 1, and improve the surface quality of the galvanized product. The heating unit includes but is not limited to an electric heating device.

[0034] Generally, the galvanizing air knife 1 includes a pair of air knife bodies, which are used to spray air knife media on both sides of the strip, respectively, wherein the two air knife bodies are respectively equipped with air inlet pipes, and the two air inlet pipes are respectively connected to the above-mentioned air supply main pipe 24. In one embodiment, it also includes a third nitrogen supply pipe and a third air supply pipe, and the third nitrogen supply pipe and the third air supply pipe are both connected to one of the air inlet pipes (defined as the first air inlet pipe), and control valves are set on the third nitrogen supply pipe, the third air supply pipe and the first air inlet pipe, and the third nitrogen supply pipe and the third air supply pipe are connected to the first air inlet pipe. The side connection points of the third nitrogen supply pipe and the third air supply pipe on the first air inlet pipe are both located downstream of the control valve of the first air inlet pipe. Based on this scheme, the two air inlet pipes can spray different air knife media at the same time, which can effectively improve the working flexibility and reliability of the galvanizing air knife 1. Pressure regulating devices can be set on the two air inlet pipes respectively, so that the spraying pressures of the two air knife bodies can be adjusted independently, which can further improve the working flexibility and reliability of the galvanizing air knife 1.

[0035] Embodiment 2

[0036] An embodiment of the utility model provides a galvanizing thickness control system, including a galvanizing air knife 1, and is also equipped with a gas supply system for the galvanizing air knife 1 provided in the above-mentioned embodiment 1, and the gas supply main pipe 24 is connected to the galvanizing air knife 1.

[0037] In one embodiment, the galvanizing thickness control system also includes an intelligent control system, and the galvanizing air knife 1 and each control valve are electrically connected to the intelligent control system; when a heating unit is provided, the heating unit is also electrically connected to the intelligent control system.

[0038] The above intelligent control system can be used for:

[0039] The nitrogen-air mixing ratio is adjusted by controlling the regulating valve on the first nitrogen supply pipe 213 and the regulating valve on the first air supply pipe 223;

[0040] The gas knife gas medium is switched by adjusting the switch valves on the second nitrogen supply pipe 214, the second air supply pipe 224 and the gas supply main pipe 24;

[0041] The temperature of the mixed gas is adjusted by controlling the heating unit.

[0042] The intelligent control system preferably utilizes the central control system of the galvanizing workshop, without the need for additional configuration of central controllers and other equipment.

[0043] In one of the embodiments, the galvanizing thickness control system is further configured with a coating thickness gauge 3, which is located downstream of the galvanizing air knife 1, and is used for real-time monitoring of the coating thickness on the surface of the strip.

[0044] Furthermore, the coating thickness gauge 3 is electrically connected to the above-mentioned intelligent control system, and the intelligent control system is used to determine whether the coating thickness is within a preset range based on the information fed back by the active coating thickness gauge 3. When the coating thickness is not within the preset range, the feedback control module in the intelligent control system performs calculations and outputs an air knife blowing pressure correction value, which is then adjusted in real time by the air knife actuator to complete the air knife blowing pressure control process.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas supply system for a galvanizing air knife, comprising a gas supply main connected to the galvanizing air knife, characterized in that: The invention also includes a first nitrogen supply pipe, a second nitrogen supply pipe, a first air supply pipe and a second air supply pipe. A nitrogen-air mixing station is arranged on the gas supply main pipe. The first nitrogen supply pipe and the first air supply pipe are both connected to the nitrogen-air mixing station. The second nitrogen supply pipe and the second air supply pipe are respectively connected to the gas supply main pipe and the supply pipe side connection points are both located downstream of the nitrogen-air mixing station. The first nitrogen supply pipe, the second nitrogen supply pipe, the first air supply pipe, the second air supply pipe and the gas supply main pipe are respectively provided with control valves. The control valve on the gas supply main pipe is located between the nitrogen-air mixing station and the adjacent supply pipe side connection points.

2. The gas supply system for a galvanizing air knife according to claim 1, characterized in that: The nitrogen-air mixing station is provided with a heating unit for heating the gas.

3. The gas supply system for a galvanizing air knife according to claim 2, characterized in that: The heating unit adopts an electric heating device.

4. The gas supply system for a galvanizing air knife according to claim 1, characterized in that: The first nitrogen supply pipe and the second nitrogen supply pipe are both connected to an air separation plant.

5. The gas supply system for a galvanizing air knife according to claim 1 or 4, characterized in that: The first nitrogen supply pipe and the second nitrogen supply pipe are both connected to a nitrogen main pipe, and the nitrogen main pipe is connected to a nitrogen source; a nitrogen buffer pipe is connected to the nitrogen main pipe, and the nitrogen buffer pipe is connected to a nitrogen buffer tank.

6. The gas supply system for a galvanizing air knife as claimed in claim 1, characterized in that: The first air supply pipe and the second air supply pipe are both connected to an air compression station.

7. The gas supply system for a galvanizing air knife according to claim 1 or 6, characterized in that: The first air supply pipe and the second air supply pipe are both connected to a compressed air main pipe, and the compressed air main pipe is connected to a compressed air source; an air buffer pipe is connected to the compressed air main pipe, and the air buffer pipe is connected to a compressed air buffer tank.

8. A galvanizing thickness control system, comprising a galvanizing air knife, characterized in that: A gas supply system for a galvanizing air knife according to any one of claims 1 to 7 is also provided, and the gas supply main is connected to the galvanizing air knife.

9. The galvanizing thickness control system according to claim 8, characterized in that: A coating thickness gauge is also provided, and the coating thickness gauge is located downstream of the galvanizing air knife.

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