Large steel ladle flow monitoring method

Abstract

The embodiment of the invention provides a monitoring method for a large steel ladle flow, and relates to the field of cast steel. The ladle steel flow monitoring method comprises the steps that the oil speed of a sliding hydraulic cylinder in unit time is obtained; the moving time and the moving distance of the sliding hydraulic cylinder moving to the corresponding position are obtained; the steel flow change speed when the sliding hydraulic cylinder moves to the corresponding position is obtained; a steel flow lower limit value and a steel flow upper limit value are calculated according to the obtained oil speed of the sliding hydraulic cylinder in unit time, the movement time and the movement distance of the sliding hydraulic cylinder moving to the corresponding position and the steel flow change speed of the sliding hydraulic cylinder moving to the corresponding position; and the moving distance of the sliding plate is adjusted according to the steel flow lower limit value and the steel flow upper limit value. Data of the steel flow are monitored according to the steel flow upper limit value and the steel flow lower limit value, so that the steel flow is automatically adjusted and controlled between the steel flow upper limit value and the steel flow lower limit value, drainage accidents are avoided, and use safety is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of steel casting, and in particular to a method for monitoring a large ladle steel flow. Background Art

[0002] In the modern steel manufacturing process, the drainage operation of inserting the long shroud of the large ladle into the tundish is a key step, which aims to effectively control the flow of molten steel to ensure that the molten steel is evenly and stably injected into the mold, thereby producing high-quality steel. However, this process faces many technical challenges, mainly involving the accuracy and safety of steel flow control. Specifically, the judgment of the size of the large ladle steel flow is usually based on the weighing change of the tundish, that is, the size and speed of the steel flow are indirectly estimated by monitoring the increase or decrease in the weight of the molten steel in the tundish. Although this method is simple, it has significant limitations in practice.

[0003] In summary, although it is feasible to determine the size of the ladle steel flow by the change in the tundish weight after the ladle shroud is inserted into the tundish, its hysteresis and uncertainty in adjustment undoubtedly constitute a safety hazard in the production process and have an adverse impact on the quality of molten steel and production costs. Therefore, seeking more accurate and real-time steel flow control methods and technologies has become the key to improving the efficiency of steel manufacturing processes and product quality. Summary of the invention

[0004] The present invention provides a method for monitoring the steel flow of a large ladle, which can accurately collect steel flow data, automatically adjust the steel flow, and is safer to use.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] An embodiment of the present invention provides a method for monitoring a ladle steel flow, which comprises:

[0007] Get the oil speed of the sliding hydraulic cylinder per unit time;

[0008] Obtain the moving time and moving distance of the sliding hydraulic cylinder to the corresponding position;

[0009] Obtain the steel flow change speed when the sliding hydraulic cylinder moves to the corresponding position;

[0010] The lower limit value and the upper limit value of the steel flow are calculated based on the oil speed of the sliding hydraulic cylinder in unit time, the moving time and the moving distance to the corresponding position, and the steel flow change speed when the sliding hydraulic cylinder moves to the corresponding position;

[0011] The moving distance of the slide plate is adjusted according to the lower limit value of the steel flow and the upper limit value of the steel flow.

[0012] Optionally, the step of obtaining the moving time and moving distance of the sliding hydraulic cylinder to the corresponding position includes:

[0013] A first distance from when the sliding hydraulic cylinder is closed to when the slide plate is half open is obtained, and a third distance from when the sliding hydraulic cylinder is closed to when the slide plate is fully open is obtained.

[0014] Optionally, the step of obtaining the moving time and moving distance of the sliding hydraulic cylinder to the corresponding position further includes:

[0015] A first time when the sliding hydraulic cylinder moves to the first distance is obtained, a second time when the sliding hydraulic cylinder moves to the second distance is obtained, and a third time when the sliding hydraulic cylinder moves to the third distance is obtained.

[0016] Optionally, the step of obtaining the moving time and moving distance of the sliding hydraulic cylinder to the corresponding position further includes:

[0017] The formula for obtaining the moving time of the sliding hydraulic cylinder to the corresponding position is:

[0018] T=C / V

[0019] In the formula: T is the moving time; C is the moving distance; V is the oil speed of the sliding hydraulic cylinder per unit time.

[0020] Optionally, the step of obtaining the steel flow change speed when the sliding hydraulic cylinder moves to the corresponding position includes:

[0021] The change speed K1 of the tundish steel flow when the slide plate is opened is obtained, the change speed K2 of the tundish steel flow when the slide plate is half opened is obtained, and the change speed K3 of the tundish steel flow when the slide plate is fully opened is obtained.

[0022] Optionally, the step of calculating the lower limit value and the upper limit value of the steel flow according to the oil speed of the sliding hydraulic cylinder per unit time, the moving time and the moving distance to the corresponding position, and the steel flow change speed when the sliding hydraulic cylinder moves to the corresponding position comprises:

[0023] The lower limit value of the steel flow is obtained according to the lower limit steel flow calculation formula, and the upper limit value of the steel flow is obtained according to the upper limit steel flow calculation formula.

[0024] Optionally, the lower limit steel flow calculation formula is:

[0025] D1=K1 / (T2-T1)

[0026] Wherein: D1 is the lower limit of the steel flow; T1 is the first time when the sliding hydraulic cylinder moves to the first distance; T2 is the second time when the sliding hydraulic cylinder moves to the second distance.

[0027] Optionally, the upper limit steel flow calculation formula is:

[0028] D3=K3 / (T3-T1)

[0029] Wherein: D3 is the upper limit of the steel flow; T3 is the third time when the sliding hydraulic cylinder moves to the third distance.

[0030] Optionally, the step of adjusting the moving distance of the slide plate according to the steel flow lower limit value and the steel flow upper limit value comprises:

[0031] When the steel flow value reaches the lower limit of the steel flow, the slide plate reaches the minimum closing position and the slide plate is no longer closed; when the steel flow value reaches the upper limit of the steel flow, the slide plate reaches the maximum opening position and the slide plate is no longer opened.

[0032] Optionally, the step of adjusting the moving distance of the slide plate according to the steel flow lower limit value and the steel flow upper limit value further includes:

[0033] The steel flow value per unit minute of operation is the total product of the cast steel section, pulling speed, flow rate and specific gravity of the ingot.

[0034] The beneficial effects of the ladle steel flow monitoring method of the embodiment of the present invention include, for example:

[0035] The method for monitoring the steel flow of a large package includes obtaining the oil speed of the sliding hydraulic cylinder in a unit time; obtaining the moving time and moving distance of the sliding hydraulic cylinder to the corresponding position; obtaining the steel flow change speed when the sliding hydraulic cylinder moves to the corresponding position; calculating the steel flow lower limit value and the steel flow upper limit value according to the obtained oil speed of the sliding hydraulic cylinder in a unit time, the moving time and moving distance to the corresponding position, and the steel flow change speed when the sliding hydraulic cylinder moves to the corresponding position; adjusting the moving distance of the slide plate according to the steel flow lower limit value and the steel flow upper limit value. When in use, the steel flow change speed is calculated by collecting and obtaining the movement data of the sliding hydraulic cylinder, and then the steel flow upper limit value and the steel flow lower limit value are obtained. The steel flow data is monitored according to the steel flow upper limit value and the steel flow lower limit value, so as to automatically adjust the steel flow, control the steel flow between the steel flow upper limit value and the steel flow lower limit value, avoid diversion accidents, and ensure safety in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 A schematic flow chart of the method for monitoring large ladle steel flow provided in this embodiment. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, 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 part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0040] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0041] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0042] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0043] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0044] In the modern steel manufacturing process, the drainage operation of inserting the long shroud of the large ladle into the tundish is a key step, which aims to effectively control the flow of molten steel to ensure that the molten steel is evenly and stably injected into the mold, thereby producing high-quality steel. However, this process faces many technical challenges, mainly involving the accuracy and safety of steel flow control. Specifically, the judgment of the size of the large ladle steel flow is usually based on the weighing change of the tundish, that is, the size and speed of the steel flow are indirectly estimated by monitoring the increase or decrease in the weight of the molten steel in the tundish. Although this method is simple, it has significant limitations in practice.

[0045] First, the hysteresis of the weighing change is a major problem. When the steel flow in the ladle begins to change, the weight of the molten steel in the tundish does not immediately reflect this change, because it takes time for the weight to increase or decrease, especially in a large-capacity tundish. This hysteresis causes the control system to be unable to adjust the steel flow in time, which may cause the steel flow to be too large or too small, thereby affecting the stability and efficiency of the entire casting process. Secondly, the inaccuracy of the steel flow adjustment may lead to extreme situations. If the control system fails to respond in an appropriate time, the steel flow may suddenly stop or change drastically, which not only increases safety risks, such as steel splashing that may injure operators, but also easily causes steel overflow during operation, further increasing the risk of production accidents. These accidents not only threaten the personal safety of employees, but also cause damage to the production environment and increase maintenance costs. Especially when producing special steels (special steels), the requirements for molten steel quality are more stringent. The production process of special steels often requires more sophisticated steel flow control to avoid direct impact and rapid cooling of molten steel, thereby protecting the alloy elements in the molten steel and ensuring the performance of the final product. However, inaccuracies in the tapping operation, especially when it comes to closing the ladle flow, can lead to anomalies in the cast billet, such as cracks, inclusions, etc. These problems not only affect the appearance and performance of the product, but may also lead to product scrapping and increase production costs.

[0046] In summary, although the technical means of judging the size of the ladle steel flow by the change in the tundish weight after the ladle shroud is inserted into the tundish is feasible, its hysteresis and uncertainty in adjustment undoubtedly constitute a safety hazard in the production process and have an adverse impact on the quality of molten steel and production costs. Therefore, seeking more accurate and real-time steel flow control methods and technologies has become the key to improving the efficiency of steel manufacturing processes and product quality.

[0047] Please refer to Figure 1 This embodiment provides a method for monitoring the flow of large-package steel, which can effectively improve the technical problems mentioned above, can accurately collect steel flow data, automatically adjust the steel flow, and is safer to use.

[0048] The ladle steel flow monitoring method comprises:

[0049] S1: Get the oil speed of the sliding hydraulic cylinder per unit time.

[0050] In this embodiment, the oil speed of the large-bale sliding hydraulic cylinder per unit time is V=0.28m / s.

[0051] S2: Obtain the moving time and moving distance of the sliding hydraulic cylinder to the corresponding position.

[0052] Specifically, a first distance from the closing position of the sliding hydraulic cylinder to the sliding plate position is obtained, a second distance from the closing position of the sliding hydraulic cylinder to the half-open position of the sliding plate is obtained, and a third distance from the closing position of the sliding hydraulic cylinder to the full-open position of the sliding plate is obtained. A first time when the sliding hydraulic cylinder moves to the first distance is obtained, a second time when the sliding hydraulic cylinder moves to the second distance is obtained, and a third time when the sliding hydraulic cylinder moves to the third distance is obtained.

[0053] In this embodiment, the formula for obtaining the moving time of the sliding hydraulic cylinder to the corresponding position is:

[0054] T=C / V

[0055] In the formula: T is the moving time; C is the moving distance; V is the oil speed of the sliding hydraulic cylinder per unit time.

[0056] It should be noted that, during the movement of the sliding hydraulic cylinder, if drainage sand flows out, it means that the sliding hydraulic cylinder has reached the slide plate position.

[0057] Specifically, the first distance C1, the second distance C2, and the third distance C3 are respectively substituted into the formula for calculation, thereby obtaining the first time T1, the second time T2, and the third time T3, respectively.

[0058] S3: Obtain the steel flow change speed when the sliding hydraulic cylinder moves to the corresponding position.

[0059] Specifically, the change speed K1 of the tundish steel flow when the slide plate is opened is obtained, the change speed K2 of the tundish steel flow when the slide plate is half-open is obtained, and the change speed K3 of the tundish steel flow when the slide plate is fully opened is obtained.

[0060] S4: Calculate the lower limit value and the upper limit value of the steel flow based on the oil speed of the sliding hydraulic cylinder per unit time, the moving time and distance to the corresponding position, and the steel flow change speed when the sliding hydraulic cylinder moves to the corresponding position.

[0061] Specifically, the lower limit value of the steel flow is obtained according to the lower limit steel flow calculation formula, and the upper limit value of the steel flow is obtained according to the upper limit steel flow calculation formula.

[0062] In this embodiment, the lower limit steel flow calculation formula is:

[0063] D1=K1 / (T2-T1)

[0064] Wherein: D1 is the lower limit of the steel flow; T1 is the first time when the sliding hydraulic cylinder moves to the first distance; T2 is the second time when the sliding hydraulic cylinder moves to the second distance.

[0065] In this embodiment, the upper limit steel flow calculation formula is:

[0066] D3=K3 / (T3-T1)

[0067] Wherein: D3 is the upper limit of steel flow; T3 is the third time when the sliding hydraulic cylinder moves to the third distance.

[0068] S5: Adjust the moving distance of the slide plate according to the lower limit value and the upper limit value of the steel flow.

[0069] Specifically, the control device drives the sliding hydraulic cylinder to move. During the movement, the control device monitors the steel flow value of the ladle. When the steel flow value reaches the lower limit of the steel flow, the slide plate reaches the minimum closing position, the control device stops driving, the sliding hydraulic cylinder stops moving, and the slide plate is no longer closed, thereby avoiding complete closure of the steel flow; when the steel flow value reaches the upper limit of the steel flow, the slide plate reaches the maximum opening position, the control device stops driving, the sliding hydraulic cylinder stops moving, and the slide plate is no longer opened, thereby avoiding waste caused by molten steel overflowing from the ladle.

[0070] In this embodiment, the steel flow value within an operating unit minute is the total product of the cast steel section, the pulling speed, the flow rate and the specific gravity of the ingot.

[0071] After obtaining the lower limit and upper limit of the steel flow through the lower limit steel flow calculation formula and the upper limit steel flow calculation formula, the control device adjusts the steel flow of the large package according to the formula Da=±(|D1|+|D2|) / 2. Among them, Da is the steel flow value within the operating unit minute.

[0072] The large ladle steel flow monitoring method provided in this embodiment can control the large ladle steel flow between the lower limit value and the upper limit value of the steel flow, ensuring the full operation of the tundish. It not only eliminates the risk of completely shutting off the steel flow during the tundish steel flow control process, but also avoids the waste caused by overflow of molten steel in the tundish. It also prevents slag rolling caused by the low liquid level of the molten steel in the tundish due to too small control of the large ladle steel flow.

[0073] In summary, the embodiment of the present invention provides a method for monitoring the flow of large-sized steel sheets, which includes obtaining the oil speed of the sliding hydraulic cylinder in a unit time; obtaining the moving time and moving distance of the sliding hydraulic cylinder to the corresponding position; obtaining the steel flow change speed when the sliding hydraulic cylinder moves to the corresponding position; calculating the lower limit value and the upper limit value of the steel flow according to the oil speed of the sliding hydraulic cylinder in a unit time, the moving time and moving distance to the corresponding position, and the steel flow change speed when the sliding hydraulic cylinder moves to the corresponding position; adjusting the moving distance of the slide plate according to the lower limit value and the upper limit value of the steel flow. When in use, the steel flow change speed is calculated by collecting and obtaining the movement data of the sliding hydraulic cylinder, and then the upper limit value and the lower limit value of the steel flow are obtained. The steel flow data is monitored according to the upper limit value and the lower limit value of the steel flow, so as to automatically adjust the steel flow, control the steel flow between the upper limit value and the lower limit value of the steel flow, avoid diversion accidents, and ensure safety in use.

[0074] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for monitoring the flow of large ladle steel, characterized in that: include: Get the oil speed of the sliding hydraulic cylinder per unit time; Obtain the moving time and moving distance of the sliding hydraulic cylinder to the corresponding position; Obtain the steel flow change speed when the sliding hydraulic cylinder moves to the corresponding position; The lower limit value and the upper limit value of the steel flow are calculated based on the oil speed of the sliding hydraulic cylinder in unit time, the moving time and the moving distance to the corresponding position, and the steel flow change speed when the sliding hydraulic cylinder moves to the corresponding position; The moving distance of the slide plate is adjusted according to the lower limit value of the steel flow and the upper limit value of the steel flow.

2. The method for monitoring ladle steel flow according to claim 1, characterized in that: The step of obtaining the moving time and moving distance of the sliding hydraulic cylinder to the corresponding position includes: A first distance from when the sliding hydraulic cylinder is closed to when the slide plate is half open is obtained, and a third distance from when the sliding hydraulic cylinder is closed to when the slide plate is fully open is obtained.

3. The method for monitoring ladle steel flow according to claim 2, characterized in that: The step of obtaining the moving time and moving distance of the sliding hydraulic cylinder to the corresponding position also includes: A first time when the sliding hydraulic cylinder moves to the first distance is obtained, a second time when the sliding hydraulic cylinder moves to the second distance is obtained, and a third time when the sliding hydraulic cylinder moves to the third distance is obtained.

4. The method for monitoring ladle steel flow according to claim 3, characterized in that: The step of obtaining the moving time and moving distance of the sliding hydraulic cylinder to the corresponding position also includes: The formula for obtaining the moving time of the sliding hydraulic cylinder to the corresponding position is: T=C / V In the formula: T is the moving time; C is the moving distance; V is the oil speed of the sliding hydraulic cylinder per unit time.

5. The method for monitoring ladle steel flow according to claim 3, characterized in that: The step of obtaining the steel flow change speed when the sliding hydraulic cylinder moves to the corresponding position comprises: The change speed K1 of the tundish steel flow when the slide plate is opened is obtained, the change speed K2 of the tundish steel flow when the slide plate is half opened is obtained, and the change speed K3 of the tundish steel flow when the slide plate is fully opened is obtained.

6. The method for monitoring ladle steel flow according to claim 5, characterized in that: The step of calculating the lower limit value and the upper limit value of the steel flow according to the oil speed of the sliding hydraulic cylinder in unit time, the moving time and the moving distance to the corresponding position, and the steel flow change speed when the sliding hydraulic cylinder moves to the corresponding position comprises: The lower limit value of the steel flow is obtained according to the lower limit steel flow calculation formula, and the upper limit value of the steel flow is obtained according to the upper limit steel flow calculation formula.

7. The method for monitoring ladle steel flow according to claim 6, characterized in that: The lower limit steel flow calculation formula is: D1=K1 / (T2-T1) Wherein: D1 is the lower limit of the steel flow; T1 is the first time when the sliding hydraulic cylinder moves to the first distance; T2 is the second time when the sliding hydraulic cylinder moves to the second distance.

8. The method for monitoring ladle steel flow according to claim 7, characterized in that: The upper limit steel flow calculation formula is: D3=K3 / (T3-T1) Wherein: D3 is the upper limit of the steel flow; T3 is the third time when the sliding hydraulic cylinder moves to the third distance.

9. The method for monitoring ladle steel flow according to claim 8, characterized in that: The step of adjusting the moving distance of the slide plate according to the lower limit value of the steel flow and the upper limit value of the steel flow comprises: When the steel flow value reaches the lower limit of the steel flow, the slide plate reaches the minimum closing position and the slide plate is no longer closed; when the steel flow value reaches the upper limit of the steel flow, the slide plate reaches the maximum opening position and the slide plate is no longer opened.

10. The method for monitoring ladle steel flow according to claim 9, characterized in that: The step of adjusting the moving distance of the slide plate according to the lower limit value of the steel flow and the upper limit value of the steel flow also includes: The steel flow value per unit minute of operation is the total product of the cast steel section, pulling speed, flow rate and specific gravity of the ingot.

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