Liquid level control device for zinc pot for continuous hot galvanizing of strip steel

Abstract

The utility model provides a strip steel continuous hot galvanizing zinc pot liquid level control device which comprises a radar liquid level meter, the radar liquid level meter is installed above the liquid level of a zinc pot, the position and the height of the radar liquid level meter can be adjusted, a grating baffle used for isolating liquid level fluctuation interference is arranged in the zinc pot, a zinc ingot supplementing mechanism is further arranged above the zinc pot, and the grating baffle is connected with the zinc ingot supplementing mechanism. The zinc ingot supplementing mechanism and the radar liquid level meter are arranged in different areas of the zinc pot in an isolated mode through a grating baffle, and the zinc ingot supplementing mechanism is communicated with the radar liquid level meter in a communication mode. The device strictly controls the liquid level of the zinc liquid to be accurate and stable, meanwhile, the factors such as the zinc pot temperature, zinc slag formation and zinc ingot loss are considered, comprehensive automatic control is achieved, and compared with other zinc adding operation control methods at present, the device is high in comprehensive control performance and safer, more stable and more efficient.

Description

Technical Field

[0001] The utility model relates to the field of color steel production, in particular to a zinc pot liquid level control device for continuous hot-dip galvanizing of strip steel. Background Art

[0002] In the continuous hot-dip galvanizing production process of strip steel, before the strip steel enters the zinc pot and completes galvanizing, it must pass through an annealing furnace to reduce the surface to sponge-like pure iron, and then pass through a furnace nose immersed in the zinc pot and zinc liquid to a certain depth to ensure sealing for galvanizing. In order to ensure that the activated surface of the strip steel does not come into contact with the air and thus avoid oxidation, resulting in poor galvanizing production quality accidents, a stable zinc liquid level must be maintained during hot-dip galvanizing.

[0003] During normal production, the zinc liquid in the zinc pot is constantly consumed, and zinc must be added to the zinc pot in time. During the zinc adding operation, the zinc pot liquid level is generally controlled at about 100mm below the pot edge, and the liquid level fluctuation is controlled within ±2mm. However, it is difficult to strictly meet the standards specified by the process for manual zinc adding. Too high a liquid level obviously brings safety hazards. Too low a liquid level directly affects the sealing of the strip entering the zinc pot, and it is easy to cause slag sticking to the upper stabilizing roller, leading to production safety accidents. When zinc is added, the zinc ingot will absorb a lot of heat and melt after entering the pot, which will reduce the temperature of the melting area. If the temperature fluctuation range is too large, more zinc slag will be generated, and together with the ash in the furnace nose, it will spread to the surface of the strip with the fluctuation of the liquid level, which is easy to cause leakage and slag sticking to the strip, directly affecting the quality of the galvanized sheet. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a zinc pot liquid level control device for continuous hot-dip galvanizing of strip steel. The device strictly controls the zinc liquid level accurately and stably, and at the same time considers factors such as zinc pot temperature, zinc slag formation, zinc ingot loss, etc. to achieve comprehensive automatic control. It has higher comprehensive controllability than other current zinc adding operation control methods, and is safer, more stable and efficient.

[0005] A zinc pot level control device for continuous hot-dip galvanizing of strip steel, comprising a radar level gauge, which is installed above the zinc pot level and has adjustable position and height, a grille baffle for isolating interference from liquid level fluctuations is provided in the zinc pot, a zinc ingot replenishing mechanism is also provided above the zinc pot, the zinc ingot replenishing mechanism and the radar level gauge are isolated and arranged in different areas of the zinc pot by the grille baffle, and the zinc ingot replenishing mechanism is in communication with the radar level gauge.

[0006] Preferably, the zinc ingot replenishing mechanism comprises a lifting device with adjustable position, an electronic hanging scale is connected below the lifting device, and the zinc ingot is connected below the electronic hanging scale.

[0007] Preferably, a temperature transmitter is provided on the side wall of the zinc pot, and the temperature transmitter is connected to a control system, and the control system is connected to a radar level meter and a zinc ingot replenishing mechanism.

[0008] Preferably, the radar level gauge is connected to a horizontal rotating rod, and the horizontal rotating rod is rotatably connected to a liftable column.

[0009] Preferably, a temporary positioning mechanism is provided between the horizontal rotating rod and the column.

[0010] Preferably, the control system includes a frequency converter, and the frequency converter is provided with a PID regulator.

[0011] Beneficial effects:

[0012] 1. The utility model has the characteristics of strong comprehensive controllability, which not only maintains the stability of the zinc liquid level in the zinc pot, but also maintains the stability of the temperature in the zinc pot. It solves the common problems in other zinc adding operations, such as the difficulty in controlling the zinc pot level, resulting in large errors, and the uneven zinc addition, which leads to large temperature fluctuations in the zinc pot, resulting in more zinc slag, uncontrollable zinc consumption and other unfavorable production factors, directly or indirectly causing comprehensive technical problems in production such as non-galvanizing, sticky slag, and missed plating on the product surface.

[0013] 2. The utility model has advanced and mature technology, is easy to manufacture and install, has strong applicability, and relatively reduces the overall cost; the wireless electronic measurement of zinc consumption and its early warning control function further improve the controllability of production costs. It has stable performance, is easy to promote, and is significantly safe and economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0015] Figure 1 This is a schematic diagram of the mechanical structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the control circuit structure of the utility model;

[0017] In the figure, 1. gantry, 2. lifting device, 3. hook, 4. electronic crane scale, 5. zinc liquid, 6. zinc pot, 7. grille baffle, 8. radar level meter, 9. rotating shaft, 10. column, 11. temperature transmitter, 12. fixed bracket, 13. signal cable, 14. frequency converter, 15. control cabinet, 16. zinc ingot. DETAILED DESCRIPTION

[0018] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0019] like Figure 1 As shown, the utility model discloses a zinc pot level control device for continuous hot-dip galvanizing of strip steel, and the liquid level control of the zinc liquid 5 is completed by the radar level meter 8, the temperature transmitter 11, the frequency converter 14 and the zinc ingot replenishing mechanism. The radar level meter 8 is installed on the upper right side of the zinc pot 6. According to the required height of the zinc liquid level, the radar level meter 8 can be freely adjusted left and right and up and down around the column 10 by the rotating shaft 9; the zinc ingot replenishing mechanism is arranged on the upper left side of the zinc pot 6, and the zinc ingot replenishing mechanism includes a gantry 1 erected above the zinc pot, and a lifting device is slidably installed on the gantry. The lifting device is preferably an electric hoist, and the electric hoist can move along the gantry beam guide rail, thereby improving the flexibility of moving the material zinc ingot. An electronic crane scale 4 is connected between the hook 3 of the electric hoist and the zinc ingots 16 entering the pot, which is convenient for recording the consumption measurement of the zinc ingots and has a zero-weight alarm function to prompt timely zinc replenishment. It synchronizes the output signal of the wireless communication alarm with the secondary metering instrument scale and the high and low limit alarm output signal of the liquid level meter to control the start and stop of the inverter 14, effectively preventing the inverter from malfunctioning.

[0020] The inverter is installed in the control cabinet, and a control vector inverter with main and auxiliary dual channels and PID adjustment function is selected, and its output power matches the electric crane motor. A fixed bracket is installed on the side wall of the zinc pot 6, and the temperature transmitter 11 connected to the fixed bracket is deeply inserted into the zinc liquid 5. The temperature transmitter is a thermocouple temperature transmitter.

[0021] The zinc liquid level control principle is as follows Figure 2 As shown, the control process is as follows: when the radar level meter 8 detects the main signal of the zinc liquid level and the secondary signal of the thermocouple temperature measurement, the cascade adjustment signal is formed, and there is a difference compared with the liquid level setting value, the difference is processed and amplified by the inverter PID regulator, and the inverter output vector frequency is adjusted to control the speed and lifting of the electric crane motor, and at the same time, the zinc ingot under the hook of the electric hoist is synchronized. When the measured value is equal to the set value, the zinc ingot in the pot is stationary. If the zinc liquid is consumed and the zinc liquid level drops, that is, the measured value is less than the set value, the crane motor reverses, and the hook and the zinc ingot fall slowly. The above process is always repeated, so as to maintain a stable zinc pot zinc level, realize automatic control of the zinc liquid level, stabilize the zinc pot temperature, reduce zinc slag, monitor zinc consumption, and improve production efficiency and product quality.

[0022] The above describes in detail the structure, features and effects of the utility model based on the embodiments shown in the drawings. The above is only a preferred embodiment of the utility model, but the utility model is not limited to the scope of implementation shown in the drawings. Any changes made in accordance with the concept of the utility model, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and the drawings, should be within the protection scope of the utility model.

Claims

1. A zinc pot liquid level control device for continuous hot-dip galvanizing of strip steel, characterized in that: The invention comprises a radar liquid level meter (8), which is installed above the liquid level of the zinc pot and has adjustable position and height. A grille baffle (7) is provided in the zinc pot for isolating interference from liquid level fluctuations. A zinc ingot replenishing mechanism is also provided above the zinc pot. The zinc ingot replenishing mechanism and the radar liquid level meter are isolated and arranged in different areas of the zinc pot through the grille baffle. The zinc ingot replenishing mechanism is in communication with the radar liquid level meter.

2. The device for controlling the liquid level of a zinc pot for continuous hot-dip galvanizing of steel strip according to claim 1, characterized in that: The zinc ingot replenishing mechanism comprises a lifting device with adjustable position, an electronic hanging scale (4) is connected below the lifting device, and a zinc ingot (16) is connected below the electronic hanging scale.

3. The device for controlling the liquid level of a zinc pot for continuous hot-dip galvanizing of a steel strip according to claim 1, characterized in that: A temperature transmitter (11) is provided on the side wall of the zinc pot, and the temperature transmitter is connected to a control system, and the control system is connected to a radar level meter and a zinc ingot replenishing mechanism.

4. A zinc pot liquid level control device for continuous hot-dip galvanizing of strip steel according to claim 3, characterized in that: The control system comprises a frequency converter, and the frequency converter is provided with a PID regulator.

5. The device for controlling the liquid level of a zinc pot for continuous hot-dip galvanizing of steel strip according to claim 1, characterized in that: The radar liquid level meter (8) is connected to a horizontal rotating rod, and the horizontal rotating rod is rotatably connected to a liftable column (10).

6. A zinc pot liquid level control device for continuous hot-dip galvanizing of strip steel according to claim 5, characterized in that: A temporary positioning mechanism is arranged between the horizontal rotating rod and the column.

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