Automatic zinc adding process for galvanized wire zinc pot

Abstract

The invention discloses an automatic zinc adding process for a galvanizing line zinc pot, which comprises the following closed-loop control process: when the liquid level of the galvanizing line zinc pot is at a preset liquid level height lower limit value, an electric hoist drives a zinc ingot to move downwards into the galvanizing line zinc pot, and the zinc ingot is gradually melted to form zinc liquid by the temperature of the galvanizing line zinc pot; the zinc adding effect on the zinc pot of the galvanized wire is achieved; when the temperature of the zinc liquid in the galvanized wire zinc pot exceeds the control temperature range, the electric hoist reduces the downward moving speed of the zinc ingot relative to the galvanized wire zinc pot or stops downward moving of the zinc ingot until the temperature of the zinc liquid in the galvanized wire zinc pot is within the control temperature range; if the liquid level of the zinc pot of the galvanizing line reaches the preset liquid level height upper limit value, the electric hoist drives the zinc ingot to be pulled upwards to be separated from the zinc pot; according to the method, automatic zinc adding of the zinc pot of the galvanizing line in production of household appliance plates of the galvanizing line is achieved, the abnormity that the temperature fluctuation of the zinc pot is too large due to automatic zinc adding abnormity of the zinc pot is greatly reduced, the operation process is simple and convenient, and the implementation cost is low.

Description

Technical Field

[0001] The invention relates to the field of galvanized household appliance plate production lines, and in particular to an automatic zinc adding process for a zinc pot of a galvanizing line. Background Art

[0002] In the production process of galvanized home appliance sheets, controlling the temperature of the zinc pot and the stability of its liquid level are two key factors in the quality control of galvanized home appliance sheets, and also directly determine the surface quality of the steel coils after galvanizing.

[0003] Specifically, during the production of galvanized household appliance sheets, the liquid level of the zinc pot will gradually decrease as the production progresses. In order to save costs, the existing technology will directly add zinc to the zinc pot. However, this direct zinc addition method will cause the zinc ingot to absorb the temperature of the zinc liquid and melt. The zinc liquid temperature is absorbed by the zinc ingot, causing the zinc liquid temperature to fluctuate violently, resulting in the fluctuation of the iron content in the zinc pot and the abnormal zinc flowers, which ultimately affects the appearance of the galvanized household appliance sheets. Since manual zinc addition cannot ensure that the temperature and liquid level of the zinc pot remain stable, the iron content in the zinc pot and the liquid level of the zinc pot will fluctuate, which will eventually cause the quality of the galvanized household appliance sheets to be unstable.

[0004] Therefore, the applicant urgently needs to seek technical solutions to solve the above technical problems. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide an automatic zinc adding process for the zinc pot of a galvanizing line, which realizes the automatic zinc adding of the zinc pot of the galvanizing line in the production of galvanized home appliance plates, greatly reduces the abnormal excessive temperature fluctuation of the zinc pot caused by the abnormal automatic zinc adding of the zinc pot, and the operation process is simple and convenient, and the implementation cost is low.

[0006] The technical solution adopted by the present invention is as follows: An automatic zinc adding process for a zinc pot of a galvanizing line, wherein an electric hoist is used to selectively pull up and move down a zinc ingot relative to the zinc pot of the galvanizing line; the electric hoist determines the descending speed of the zinc ingot relative to the zinc pot of the galvanizing line based on the liquid level height of the zinc pot of the galvanizing line and the temperature of the zinc liquid; wherein the automatic zinc adding process includes the following closed-loop control process: When the liquid level of the zinc pot of the galvanizing line is at the preset lower limit of the liquid level height, the electric hoist drives the zinc ingot to move down into the zinc pot of the galvanizing line, and the temperature of the zinc pot of the galvanizing line gradually melts the zinc ingot to form zinc liquid, thereby achieving the effect of adding zinc to the zinc pot of the galvanizing line; When it is found that the temperature of the zinc liquid in the zinc pot of the galvanizing line exceeds the control temperature range, the electric hoist reduces the downward movement speed of the zinc ingot relative to the zinc pot of the galvanizing line or stops the downward movement of the zinc ingot until the temperature of the zinc liquid in the zinc pot of the galvanizing line is within the control temperature range; If the liquid level of the zinc pot of the galvanizing line reaches a preset upper limit of the liquid level height, the electric hoist drives the zinc ingot to be pulled up and out of the zinc pot.

[0007] Preferably, the controlled temperature range is 458-463°C.

[0008] Preferably, the electric hoist binds the zinc ingot with an iron chain, and the zinc ingot is added into the zinc pot of the galvanizing line by pulling the iron chain.

[0009] Preferably, the electric hoist is a variable frequency electric hoist, and the motor speed of the electric hoist is precisely controlled by a frequency converter.

[0010] Preferably, the electric hoist is hoisted on a track to achieve the effect of moving the electric hoist and hoisting the zinc ingot.

[0011] Preferably, an ultrasonic liquid level detection device or an infrared liquid level detection device is used to monitor the liquid level of the zinc pot of the galvanizing line, wherein the ultrasonic liquid level detection device detects the liquid level in a non-contact manner. When performing liquid level monitoring, an ultrasonic pulse is emitted to the liquid level of the zinc pot of the galvanizing line. The ultrasonic pulse encounters the surface of the zinc liquid and is reflected back. The liquid level height of the zinc pot of the galvanizing line is calculated by measuring the time difference between the pulse emission and the pulse reception.

[0012] Preferably, a thermocouple is used to detect the temperature of the zinc liquid in the zinc pot of the galvanizing line.

[0013] Preferably, the electric hoist, the ultrasonic liquid level detection device and the thermocouple are connected for communication control via a controller.

[0014] Preferably, the controller uses a PLC control chip provided by Siemens.

[0015] Preferably, the device structure mounting parts used in the automatic zinc adding process are all welded with stainless steel, and the stainless steel is solution treated at a temperature not lower than 700° C. to avoid oxidation or deformation in the zinc pot of the galvanizing line.

[0016] The present application adopts an automatic zinc adding process in a closed-loop control process: when the liquid level of the zinc pot of the galvanizing line is at a preset lower limit of the liquid level height, the electric hoist drives the zinc ingot to move down into the zinc pot of the galvanizing line, and the temperature of the zinc pot of the galvanizing line gradually melts the zinc ingot to form zinc liquid, thereby achieving the zinc adding effect on the zinc pot of the galvanizing line; when it is found that the zinc liquid temperature of the zinc pot of the galvanizing line exceeds the control temperature range, the electric hoist reduces the downward movement speed of the zinc ingot relative to the zinc pot of the galvanizing line or stops the downward movement of the zinc ingot until the zinc liquid temperature of the zinc pot of the galvanizing line is within the control temperature range; if the liquid level of the zinc pot of the galvanizing line reaches a preset upper limit of the liquid level height, the electric hoist drives the zinc ingot to pull up and out of the zinc pot; the automatic zinc adding process provided by the present application realizes the automatic zinc adding of the zinc pot of the galvanizing line in the production of galvanized home appliance panels, greatly reducing the abnormal excessive temperature fluctuation of the zinc pot caused by the abnormal automatic zinc adding of the zinc pot, and the operation process is simple and convenient, and the implementation cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the installation structure of the electric hoist under the specific implementation mode of the present application. DETAILED DESCRIPTION

[0018] The embodiment of the present invention discloses an automatic zinc adding process for a zinc pot of a galvanizing line, wherein an electric hoist is used to selectively pull up and move down a zinc ingot relative to the zinc pot of the galvanizing line; the electric hoist determines the descending speed of the zinc ingot relative to the zinc pot of the galvanizing line based on the liquid level height of the zinc pot of the galvanizing line and the temperature of the zinc liquid; wherein the automatic zinc adding process includes the following closed-loop control process: when the liquid level of the zinc pot of the galvanizing line is at a preset lower limit value of the liquid level height, the electric hoist drives the zinc ingot to move down into the zinc pot of the galvanizing line, and the temperature of the zinc pot of the galvanizing line gradually melts the zinc ingot to form zinc liquid, thereby achieving the effect of adding zinc to the zinc pot of the galvanizing line; when it is found that the temperature of the zinc liquid of the zinc pot of the galvanizing line exceeds a control temperature range, the electric hoist reduces the downward moving speed of the zinc ingot relative to the zinc pot of the galvanizing line or stops the downward moving of the zinc ingot until the temperature of the zinc liquid of the zinc pot of the galvanizing line is within the control temperature range; if the liquid level of the zinc pot of the galvanizing line reaches a preset upper limit value of the liquid level height, the electric hoist drives the zinc ingot to pull up and leave the zinc pot.

[0019] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0020] Please combine Figure 1As shown, an automatic zinc adding process for a zinc pot of a galvanizing line is used, wherein an electric hoist 1 is used to selectively pull up and move down a zinc ingot 2 relative to the zinc pot of the galvanizing line; the electric hoist 1 determines the descending speed of the zinc ingot 2 relative to the zinc pot of the galvanizing line based on the liquid level height of the zinc pot of the galvanizing line and the temperature of the zinc liquid; wherein the automatic zinc adding process includes the following closed-loop control process: When the liquid level of the zinc pot of the galvanizing line is at the preset lower limit of the liquid level height (specifically set according to actual needs), the electric hoist 1 drives the zinc ingot 2 to move down into the zinc pot of the galvanizing line. The temperature of the zinc pot of the galvanizing line gradually melts the zinc ingot 2 to form zinc liquid, thereby achieving the effect of adding zinc to the zinc pot of the galvanizing line. When it is found that the zinc liquid temperature of the zinc pot of the galvanizing line exceeds the control temperature range, the electric hoist 1 reduces the downward movement speed of the zinc ingot 2 relative to the zinc pot of the galvanizing line or stops the downward movement of the zinc ingot 2 until the zinc liquid temperature of the zinc pot of the galvanizing line is within the control temperature range; preferably, in this embodiment, the control temperature range is 458-463°C; the specific control temperature range conditions may also include: if the temperature change difference exceeds 1°C, then reduce the downward movement speed of the zinc ingot 2 relative to the zinc pot of the galvanizing line until the temperature change difference is controlled within the range of 1°C; If the liquid level of the zinc pot of the galvanizing line reaches a preset upper limit of the liquid level height (specifically set according to actual needs, and an alarm signal can be sent to the controller), the electric hoist 1 drives the zinc ingot 2 to pull up and out of the zinc pot.

[0021] Preferably, in the present embodiment, the electric hoist 1 is bound with the zinc ingot 2 by the iron chain 4, and the zinc ingot 2 is added into the zinc pot of the galvanizing line by the traction of the iron chain 4; further preferably, the electric hoist 1 adopts a variable frequency electric hoist 1, and the motor speed of the electric hoist 1 is accurately controlled by the frequency converter, so as to achieve the purpose of stepless speed regulation; wherein, the frequency converter can automatically sense the load and speed of the motor, automatically adjust the power supply frequency and voltage, so that the output speed of the motor is kept within the required range, and has the advantages of wide speed regulation range and high precision, and can flexibly adjust the speed according to actual work requirements; there is no impact and shaking at startup, and the stability of the hoisted object is guaranteed, which is particularly suitable for the automatic zinc adding process occasions with high requirements for hoisting stability in the present embodiment, and has good energy-saving effect, and can automatically adjust the output power of the motor according to the load condition; further preferably, in the present embodiment, the electric hoist 1 is hoisted on the track 3 to realize the movement of the electric hoist 1 and the effect of hoisting the zinc ingot 2.

[0022] Preferably, in this embodiment, an ultrasonic liquid level detection device or an infrared liquid level detection device is used to monitor the liquid level of the zinc pot of the galvanizing line. More preferably, in this embodiment, an ultrasonic liquid level detection device is used to monitor the liquid level of the zinc pot of the galvanizing line. The ultrasonic liquid level detection device detects the liquid level in a non-contact manner. When performing liquid level monitoring, an ultrasonic pulse is emitted to the liquid level of the zinc pot of the galvanizing line. The ultrasonic pulse encounters the surface of the zinc liquid and is reflected back. The liquid level height of the zinc pot of the galvanizing line is calculated by measuring the time difference between the pulse emission and the pulse reception. The ultrasonic liquid level detection device used in this embodiment does not directly contact the zinc liquid in the zinc pot of the galvanizing line during the monitoring process, thereby avoiding the influence of high temperature and corrosion, and has the characteristics of easy installation and low maintenance cost.

[0023] Preferably, in this embodiment, a thermocouple is used to detect the temperature of the molten zinc in the zinc pot of the galvanizing line; wherein, the temperature detection working principle of the thermocouple is: the two ends of two conductors of different components are connected to form a loop, when the temperatures of the two junctions are different, an electromotive force will be generated in the loop, and the temperature is determined by measuring the magnitude of the electromotive force; the characteristics of the thermocouple are: high measurement accuracy, fast response speed, adaptability to high temperature environment, and it is very suitable for the detection of the molten zinc temperature in the zinc pot of the galvanizing line.

[0024] It should be particularly noted that the automatic zinc adding process provided in this embodiment is an independently executed control program and does not rely on the secondary system of galvanizing control. Therefore, the automatic zinc adding process program has good stability, strong anti-interference and independence; preferably, in this embodiment, the electric hoist 1, the ultrasonic liquid level detection device and the thermocouple are connected for communication control through the controller; further preferably, in this embodiment, the controller adopts the PLC control chip provided by Siemens.

[0025] Preferably, in this embodiment, the device structure mounting parts used in the automatic zinc adding process (especially including the related structure mounting parts of the thermocouple) are all welded with stainless steel, and the stainless steel is solution treated at a temperature not lower than 700°C to avoid oxidation or deformation in the zinc pot of the galvanizing line.

[0026] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0027] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An automatic zinc adding process for a zinc pot of a galvanizing line, characterized in that: An electric hoist is used to selectively pull up and move down the zinc ingot relative to the zinc pot of the galvanizing line; the electric hoist determines the descending speed of the zinc ingot relative to the zinc pot of the galvanizing line based on the liquid level height of the zinc pot of the galvanizing line and the temperature of the zinc liquid; wherein the automatic zinc addition process includes the following closed-loop control process: When the liquid level of the zinc pot of the galvanizing line is at the preset lower limit of the liquid level height, the electric hoist drives the zinc ingot to move down into the zinc pot of the galvanizing line, and the temperature of the zinc pot of the galvanizing line gradually melts the zinc ingot to form zinc liquid, thereby achieving the effect of adding zinc to the zinc pot of the galvanizing line; When it is found that the temperature of the zinc liquid in the zinc pot of the galvanizing line exceeds the control temperature range, the electric hoist reduces the downward movement speed of the zinc ingot relative to the zinc pot of the galvanizing line or stops the downward movement of the zinc ingot until the temperature of the zinc liquid in the zinc pot of the galvanizing line is within the control temperature range; If the liquid level of the zinc pot of the galvanizing line reaches a preset upper limit of the liquid level height, the electric hoist drives the zinc ingot to be pulled up and out of the zinc pot.

2. The automatic zinc adding process for the zinc pot of a galvanizing line according to claim 1 is characterized in that: The controlled temperature range is 458-463°C.

3. The automatic zinc adding process for the zinc pot of the galvanizing line according to claim 1 is characterized in that: The electric hoist binds the zinc ingots through iron chains, and the zinc ingots are added into the zinc pot of the galvanizing line by pulling the iron chains.

4. The automatic zinc adding process for the zinc pot of a galvanizing line according to claim 1 is characterized in that: The electric hoist adopts a variable frequency electric hoist, and the motor speed of the electric hoist is accurately controlled by a frequency converter.

5. The automatic zinc adding process for the zinc pot of a galvanizing line according to claim 1 is characterized in that: The electric hoist is hoisted on the track to achieve the effect of moving the electric hoist and hoisting the zinc ingot.

6. The automatic zinc adding process for the zinc pot of a galvanizing line according to claim 1 is characterized in that: An ultrasonic liquid level detection device or an infrared liquid level detection device is used to monitor the liquid level of the zinc pot of the galvanizing line. The ultrasonic liquid level detection device detects the liquid level in a non-contact manner. When performing liquid level monitoring, an ultrasonic pulse is emitted to the liquid level of the zinc pot of the galvanizing line. The ultrasonic pulse is reflected back when it encounters the surface of the zinc liquid. The liquid level height of the zinc pot of the galvanizing line is calculated by measuring the time difference between the pulse emission and the pulse reception.

7. The automatic zinc adding process for the zinc pot of a galvanizing line according to claim 6 is characterized in that: Thermocouples are used to detect the temperature of the zinc liquid in the zinc pot of the galvanizing line.

8. The automatic zinc adding process for the zinc pot of a galvanizing line according to claim 7, characterized in that: The electric hoist, ultrasonic level detection device and thermocouple are connected for communication control via the controller.

9. The automatic zinc adding process for the zinc pot of a galvanizing line according to claim 8, characterized in that: The controller adopts PLC control chip provided by Siemens.

10. The automatic zinc adding process for the zinc pot of the galvanizing line according to claim 1, characterized in that: The device structure mounting parts used in the automatic zinc adding process are all welded with stainless steel, and the stainless steel is solution treated at a temperature not lower than 700° C. to avoid oxidation or deformation in the zinc pot of the galvanizing line.

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