Weighing method and system for ladle molten steel of continuous casting machine

Abstract

The invention discloses a weighing method and system for ladle molten steel of a continuous casting machine. The method comprises the steps that the net weight of the ladle molten steel of the continuous casting machine is read through a steelmaking system; when the molten steel in the large ladle flows into the tundish of the continuous casting machine and the capacity of the molten steel in the tundish of the continuous casting machine is the maximum capacity, weighing a first buggy ladle currently bearing the tundish of the continuous casting machine, and obtaining the constant net weight of the molten steel of the tundish of the continuous casting machine by removing the tare weight of the first buggy ladle; the tapping weight is determined by obtaining the pulling speed of the withdrawal and straightening machine; and according to the constant net weight of the molten steel in the tundish of the continuous casting machine, the tapping weight of the withdrawal and straightening machine and the net weight of the molten steel in the large ladle of the continuous casting machine, the real-time weight of the molten steel in the large ladle is obtained. And post personnel are guided to control exchange of molten steel in the steel ladle and accurate control of the residual steel amount through the current residual amount of the molten steel in the large ladle which is calculated in real time, so that the stability and continuity of production of the continuous mill are improved.

Description

Technical Field

[0001] The present invention relates to the field of automation control technology, and in particular to a method and system for weighing molten steel in a ladle of a continuous casting machine. Background Art

[0002] During continuous casting, controlling the weight of molten steel within the ladle is a critical parameter for efficient billet production. Currently, most ladle weighing systems utilize load cells mounted on the ladle support arms. However, in actual operation, when the ladle is being placed or lifted by the crane, it can easily collide with the load cell or its wiring, damaging it and affecting the accuracy of the load cell's measurement data, which in turn severely impacts the accuracy of the net weight of the molten steel.

[0003] Secondly, due to the dust and high temperature environment, the signal cables of the weighing sensors are often damaged or interfered with, affecting the inaccurate weighing data. At the same time, the production process is a high-risk working environment and cannot be handled quickly, resulting in the inability to control the weight of the molten steel in the current ladle, affecting production.

[0004] Therefore, how to accurately measure the real-time weight of molten steel while ensuring safety is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] In order to solve the above technical problems, this application proposes the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a method for weighing molten steel in a ladle of a continuous casting machine, comprising:

[0007] Read the net weight of molten steel in the continuous casting ladle through the steelmaking system;

[0008] When the molten steel in the ladle flows into the continuous casting machine tundish and the molten steel in the continuous casting machine tundish reaches its maximum capacity, weighing the first ladle car currently carrying the continuous casting machine tundish, and obtaining the constant net weight of the molten steel in the continuous casting machine tundish by tare weight of the first ladle car;

[0009] Determine the tapping weight by obtaining the pulling speed of the straightening machine;

[0010] The real-time weight of the molten steel in the ladle is obtained according to the constant net weight of the molten steel in the tundish of the continuous casting machine, the steel discharge weight of the straightening machine and the net weight of the molten steel in the ladle of the continuous casting machine.

[0011] In a possible implementation, reading the net weight of the molten steel in the continuous casting ladle by the steelmaking system includes:

[0012] determining the weight of the continuous casting machine ladle turret before the ladle of molten steel flows into the ladle turret of the continuous casting machine;

[0013] After the ladle is seated on the ladle turret of the continuous casting machine, weighing is performed again;

[0014] The net weight of the continuous casting machine ladle molten steel is obtained by subtracting the initial weight of the continuous casting machine ladle turret from the second weighing weight.

[0015] In a possible implementation, when the molten steel in the ladle flows into the continuous casting machine tundish and the molten steel in the continuous casting machine tundish reaches its maximum capacity, the first ladle car currently carrying the continuous casting machine tundish is weighed, and the constant net weight of the molten steel in the continuous casting machine tundish is obtained by tare weight of the first ladle car, including:

[0016] determining the tare weight of the continuous casting machine tundish before the molten steel in the ladle flows into the continuous casting machine tundish;

[0017] When the molten steel in the tundish of the continuous casting machine reaches the maximum capacity, determining the total weight of the current tundish;

[0018] The constant net weight of the molten steel in the continuous casting machine tundish is obtained by subtracting the tare weight of the continuous casting machine tundish from the total weight of the tundish.

[0019] In a possible implementation, when the molten steel in the tundish of the continuous casting machine reaches the maximum capacity, determining the total weight of the current tundish includes:

[0020] Get the liquid level position of the preset scale of the continuous casting machine tundish;

[0021] The liquid level position of the molten steel in the tundish of the continuous casting machine is detected by edge detection algorithm;

[0022] When the difference between the liquid level position at the preset scale and the liquid level position of the molten steel in the tundish is within a preset range, the molten steel in the tundish of the continuous casting machine reaches the maximum capacity;

[0023] The total weight of the current tundish is determined based on the maximum capacity of the molten steel in the tundish of the continuous casting machine.

[0024] In a possible implementation, the calculation of the steel tapping weight using the pulling speed of the pulling and leveling machine includes:

[0025] Determining the weight of each meter of the steel billet drawn out by the drawing and leveling machine;

[0026] Determine the total length of the drawn billet in combination with the drawing speed and working time of the drawing and leveling machine;

[0027] The actual weight of the drawn steel is obtained according to the weight of the steel billet per meter and the total length of the drawn steel billet.

[0028] In a possible implementation, obtaining the real-time weight of the molten steel in the ladle according to the constant net weight of the molten steel in the tundish of the continuous casting machine, the steel tapping weight of the straightening machine, and the net weight of the molten steel in the ladle of the continuous casting machine includes:

[0029] The real-time weight of the molten steel in the ladle = the net weight of the molten steel in the continuous casting machine ladle read by the steelmaking system - (the constant net weight of the molten steel in the continuous casting machine ladle + the steel output weight calculated by the pulling speed of the straightening machine).

[0030] In a possible implementation, when a new ladle is replaced, the constant net weight of molten steel of the previous tundish and the tapping weight calculated by the pulling speed of the straightening machine are stored;

[0031] After the new ladle is poured, the actual amount of steel discharged from the ladle is calculated by subtracting the net weight of the new ladle of molten steel read by the steelmaking system from the stored constant net weight of the previous tundish and the weight of steel discharged calculated by the pulling speed of the straightening machine.

[0032] The real-time weight of the molten steel in the ladle is obtained by subtracting the actual amount of steel added from the net weight of the new ladle of molten steel read by the steelmaking system.

[0033] In one possible implementation, when a new bale is reweighed, the weight of the drawn steel from the previous bale is cleared.

[0034] In a possible implementation, if the first ladle car fails, the casting of the slab is stopped, the weight of the tundish in the first ladle car and the tare weight of the second ladle car are determined, and then the ladle car is switched to the second ladle car.

[0035] In a second aspect, an embodiment of the present application provides a continuous casting machine ladle molten steel weighing system, comprising:

[0036] A reading module is used to read the net weight of molten steel in the continuous casting ladle through the steelmaking system;

[0037] a net weight acquisition module, configured to weigh the first ladle car currently carrying the continuous casting machine tundish when the molten steel in the ladle flows into the continuous casting machine tundish and the molten steel in the continuous casting machine tundish reaches its maximum capacity, and obtain the constant net weight of the molten steel in the continuous casting machine tundish by tare weight of the first ladle car;

[0038] The confirmation module is used to determine the steel tapping weight by obtaining the pulling speed of the straightening machine;

[0039] The calculation module is used to obtain the real-time weight of the molten steel in the ladle according to the constant net weight of the molten steel in the ladle of the continuous casting machine, the steel output weight of the straightening machine and the net weight of the molten steel in the ladle of the continuous casting machine.

[0040] Compared with the prior art, the present invention has the following advantages:

[0041] This application calculates the current remaining amount of molten steel in the ladle through the constant net weight of molten steel in the continuous casting machine's tundish, the steel output weight calculated by the pulling speed of the straightening machine, and the current net weight of molten steel in the ladle read from the steelmaking system, thereby guiding the on-site personnel to control the replacement of molten steel in the ladle and the precise control of the remaining steel amount, realizing redundant control, improving the stability and continuity of the continuous rolling mill production, thereby improving the economic benefits, and having a high application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic flow chart of a method for weighing molten steel in a ladle of a continuous casting machine provided in an embodiment of the present application;

[0043] Figure 2 A schematic diagram of the structure of a continuous casting machine ladle molten steel weighing system provided in an embodiment of the present application;

[0044] Figure 3 A schematic diagram of a continuous casting machine ladle molten steel weighing system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] The present invention will be described below with reference to the accompanying drawings and specific implementation methods.

[0046] Figure 1 This is a flow chart of a method for weighing molten steel in a ladle of a continuous casting machine provided in an embodiment of the present application, see Figure 1 The method for weighing molten steel in a ladle of a continuous casting machine in this embodiment includes:

[0047] S101, read the net weight of molten steel in the continuous casting ladle through the steelmaking system.

[0048] In this embodiment, in order to improve the accuracy of obtaining the real-time weight of the molten steel in the ladle, the weight of the ladle turret of the continuous casting machine is determined before the molten steel in the ladle flows into the ladle turret of the continuous casting machine. After the ladle is seated on the ladle turret of the continuous casting machine, it is weighed again. The net weight of the molten steel in the continuous casting machine ladle is obtained by subtracting the initial weight of the ladle turret from the second weighing weight. Figure 2 In this embodiment, the net weight of the molten steel in the continuous casting machine ladle read by the steelmaking system is 52, and the read data is stored in 400328. After the net weight of the molten steel in the ladle is read, you can click the 000416 button to obtain the real-time weight of the molten steel in the ladle, and store the above real-time weight in 400330.

[0049] S102, when the molten steel in the large ladle flows into the continuous casting machine tundish and the molten steel in the continuous casting machine tundish reaches the maximum capacity, the first ladle car currently carrying the continuous casting machine tundish is weighed, and the constant net weight of the molten steel in the continuous casting machine tundish is obtained by tare weight of the first ladle car.

[0050] In this embodiment, the tare weight of the continuous casting machine tundish is determined before the molten steel in the large ladle flows into the continuous casting machine tundish. When the molten steel in the continuous casting machine tundish reaches the maximum capacity, the total weight of the current tundish is determined. The tare weight of the continuous casting machine tundish is subtracted from the total weight of the tundish to obtain the constant net weight of the molten steel in the continuous casting machine tundish.

[0051] Since the molten steel produced during the steelmaking process has an extremely high temperature and corrosiveness, it poses a great hazard to the human body. Therefore, in this embodiment of the present application, a preset scale is set on the top of the continuous casting machine tundish, and the liquid level line position of the preset scale of the continuous casting machine tundish is obtained. The liquid level line position of the molten steel in the continuous casting machine tundish is detected by an edge detection algorithm. When the difference between the liquid level line position at the preset scale and the liquid level line position of the molten steel in the tundish is within the range of 4-5 cm, it indicates that the molten steel in the continuous casting machine tundish has reached its maximum capacity at this time. The total weight of the current tundish is determined based on the maximum capacity of the molten steel in the continuous casting machine tundish at this time.

[0052] In this embodiment, 000412 and 000413 are tundish selection buttons, 400186 stores the tare weight of the first ladle car, 400188 stores the tare weight of the second ladle car, and 400146 stores the constant net weight of molten steel in the tundish of the continuous casting machine.

[0053] If the first ladle car breaks down during this process, the casting is stopped and the weight of the tundish in the first ladle car and the tare weight of the second ladle car are determined, and the tundish selection button 000413 is used to switch to the second ladle car.

[0054] S103, determining the steel output weight by obtaining the pulling speed of the straightening machine.

[0055] In this embodiment, the weight of each meter of steel billet pulled out by the straightening machine is first determined, and then the total length of the pulled steel billet is determined in combination with the pulling speed and working time of the straightening machine. The actual weight of the pulled steel is obtained based on the weight of each meter of steel billet and the total length of the pulled steel billet.

[0056] S104, obtaining the real-time weight of the molten steel in the ladle according to the constant net weight of the molten steel in the tundish of the continuous casting machine, the steel tapping weight of the straightening machine, and the net weight of the molten steel in the ladle of the continuous casting machine.

[0057] In this embodiment, the real-time weight of the molten steel in the ladle = the net weight of the molten steel in the continuous casting machine ladle read by the steelmaking system - (the constant net weight of the molten steel in the continuous casting machine tundish + the steel output weight calculated by the pulling speed of the straightening machine).

[0058] In order to further improve the accuracy of the real-time weight calculation of the molten steel in the ladle, corresponding compensation and correction are also carried out. Each time a new ladle is replaced, the constant net weight of the molten steel in the last tundish and the weight calculated by the pulling speed are stored. Afterwards, after the new ladle is poured, the net weight of the new ladle of molten steel read by the steelmaking system is deducted from the stored constant net weight of the previous tundish and the weight of the steel calculated by the pulling speed of the straightener as the actual amount of steel discharged from the ladle.

[0059] The actual amount of steel removed is subtracted from the net weight of the new ladle of molten steel read by the steelmaking system to obtain the real-time weight of the molten steel in the ladle. This compensates for the weight of molten steel removed from the tundish when the ladle is replaced, ensuring the accuracy of the ladle weight.

[0060] In this embodiment, correction refers to calculating the weight of the steel billets drawn from the straightening machine. Normal operation requires clicking the "Calculate Weight" button before each ladle change to clear the weight of the steel drawn from the previous ladle. If the "Calculate Weight" button is not clicked, the weight of the steel drawn from each ladle will be accumulated. The more the weight is accumulated, the greater the error, and the calculation of the real-time weight of the steel in the ladle will be erroneous, resulting in inaccurate results. Therefore, production operators must ensure that they can click the "Calculate Weight" button every time a ladle is changed to recalculate the actual weight of the steel drawn from the new ladle.

[0061] Corresponding to the method for weighing molten steel in a ladle of a continuous casting machine provided in the above embodiment, the present application also provides an embodiment of a system for weighing molten steel in a ladle of a continuous casting machine.

[0062] See also Figure 3 The continuous casting machine ladle molten steel weighing system 20 provided in the embodiment of the present application includes:

[0063] A reading module 201 is used to read the net weight of molten steel in a ladle of a continuous casting machine through a steelmaking system;

[0064] The net weight acquisition module 202 is configured to weigh the first ladle car currently carrying the tundish when the molten steel in the ladle flows into the tundish of the continuous casting machine and the molten steel in the tundish of the continuous casting machine reaches its maximum capacity, and obtain the constant net weight of the molten steel in the tundish of the continuous casting machine by tare weight of the first ladle car;

[0065] Module 203 is used to determine the steel tapping weight by obtaining the pulling speed of the straightening machine;

[0066] The calculation module 204 is used to obtain the real-time weight of the molten steel in the ladle according to the constant net weight of the molten steel in the continuous casting machine ladle, the steel output weight of the straightening machine, and the net weight of the molten steel in the continuous casting machine ladle.

[0067] In the embodiments of this application, "multiple" refers to two or more. "And / or" describes the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can mean that A exists alone, A and B exist simultaneously, or B exists alone. A and B can be singular or plural. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0068] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0069] The above description is merely a specific embodiment of the present application. Any person skilled in the art may easily conceive of variations or substitutions within the technical scope disclosed in this application, and such variations or substitutions shall be within the scope of protection of this application. The scope of protection of this application shall be subject to the scope of protection of the claims.

Claims

1. A method for weighing molten steel in a ladle of a continuous casting machine, characterized in that: include: Read the net weight of molten steel in the continuous casting ladle through the steelmaking system; When the molten steel in the large ladle flows into the continuous casting machine tundish and the molten steel in the continuous casting machine tundish reaches the maximum capacity, the first ladle car currently carrying the continuous casting machine tundish is weighed, and the constant net weight of the molten steel in the continuous casting machine tundish is obtained by tare weight of the first ladle car; Determine the steel output weight by obtaining the pulling speed of the pulling and leveling machine; The real-time weight of the molten steel in the ladle is obtained according to the constant net weight of the molten steel in the tundish of the continuous casting machine, the steel output weight of the straightening machine and the net weight of the molten steel in the ladle of the continuous casting machine.

2. The method for weighing molten steel in a ladle of a continuous casting machine according to claim 1, characterized in that: The method of reading the net weight of molten steel in a ladle of a continuous casting machine through a steelmaking system includes: Determining the weight of the ladle turret of the continuous casting machine before the ladle of molten steel flows into the ladle turret of the continuous casting machine; After the ladle is seated on the ladle turntable of the continuous casting machine, weighing is performed again; The net weight of the molten steel in the continuous casting ladle is obtained by subtracting the initial weight of the continuous casting ladle turret from the second weighing.

3. The method for weighing molten steel in a ladle of a continuous casting machine according to claim 1, characterized in that: When the molten steel in the ladle flows into the tundish of the continuous casting machine and the molten steel in the tundish of the continuous casting machine reaches the maximum capacity, the first ladle car currently carrying the tundish of the continuous casting machine is weighed, and the constant net weight of the molten steel in the tundish of the continuous casting machine is obtained by tare weight of the first ladle car, including: Determining the tare weight of the continuous casting machine tundish before the molten steel in the ladle flows into the continuous casting machine tundish; When the molten steel in the tundish of the continuous casting machine reaches the maximum capacity, determining the total weight of the current tundish; The constant net weight of molten steel in the tundish of the continuous casting machine is obtained by subtracting the tare weight of the tundish of the continuous casting machine from the total weight of the tundish.

4. The method for weighing molten steel in a ladle of a continuous casting machine according to claim 3, characterized in that: When the molten steel in the tundish of the continuous casting machine reaches the maximum capacity, determining the total weight of the current tundish includes: Obtain the liquid level position of the preset scale of the tundish of the continuous casting machine; The position of the liquid level line of the molten steel in the tundish of the continuous casting machine is detected by edge detection algorithm; When the difference between the liquid level position at the preset scale and the liquid level position of the molten steel in the tundish is within a preset range, the molten steel in the tundish of the continuous casting machine reaches the maximum capacity; The total weight of the current tundish is determined based on the maximum capacity of the molten steel in the tundish of the continuous casting machine.

5. The method for weighing molten steel in a ladle of a continuous casting machine according to claim 1, characterized in that: The method of calculating the steel output weight by using the pulling speed of the pulling and leveling machine comprises: Determining the weight of each meter of the steel billet pulled out by the drawing and leveling machine; Determine the total length of the drawn billet in combination with the drawing speed and working time of the drawing and leveling machine; The actual weight of the drawn steel is obtained according to the weight of the steel billet per meter and the total length of the drawn steel billet.

6. The method for weighing molten steel in a ladle of a continuous casting machine according to claim 1, characterized in that: The real-time weight of the molten steel in the ladle is obtained according to the constant net weight of the molten steel in the tundish of the continuous casting machine, the steel output weight of the straightening machine, and the net weight of the molten steel in the ladle of the continuous casting machine, including: The real-time weight of the molten steel in the ladle = the net weight of the molten steel in the continuous casting ladle read by the steelmaking system - (the constant net weight of the molten steel in the tundish of the continuous casting machine + the steel output weight calculated by the pulling speed of the straightening machine).

7. The method for weighing molten steel in a ladle of a continuous casting machine according to claim 1, characterized in that: include: When replacing a new ladle, the constant net weight of molten steel of the previous ladle and the steel output weight calculated by the pulling speed of the straightening machine are stored; After the new ladle is poured, the actual amount of steel discharged from the ladle is calculated by deducting the net weight of the new ladle of molten steel from the constant net weight of the previous tundish stored and the weight of steel discharged calculated by the pulling speed of the straightening machine from the net weight of molten steel read by the steelmaking system. The real-time weight of the molten steel in the ladle is obtained by subtracting the actual amount of steel put in from the net weight of the new ladle of molten steel of the continuous casting machine read by the steelmaking system.

8. The method for weighing molten steel in a ladle of a continuous casting machine according to claim 1, characterized in that: include: When a new bale is reweighed, the weight of the drawn steel from the previous bale is cleared.

9. The method for weighing molten steel in a ladle of a continuous casting machine according to claim 1, characterized in that: If the first ladle car fails, the casting of the steel strands is stopped, the weight of the tundish in the first ladle car and the tare weight of the second ladle car are determined, and the steel strands are switched to the second ladle car.

10. A continuous casting machine ladle molten steel weighing system, characterized in that: include: A reading module is used to read the net weight of molten steel in a ladle of a continuous casting machine through a steelmaking system; A net weight acquisition module is used to weigh the first ladle car currently carrying the continuous casting machine tundish when the molten steel in the large ladle flows into the continuous casting machine tundish and the molten steel in the continuous casting machine tundish is at maximum capacity, and obtain the constant net weight of the molten steel in the continuous casting machine tundish by removing the tare weight of the first ladle car; The confirmation module is used to determine the steel output weight by obtaining the pulling speed of the pulling and leveling machine; The calculation module is used to obtain the real-time weight of the molten steel in the ladle according to the constant net weight of the molten steel in the ladle of the continuous casting machine, the steel output weight of the straightening machine and the net weight of the molten steel in the ladle of the continuous casting machine.

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