Cast rolling pouring system

Abstract

The utility model belongs to the field of metal cast-rolling plate preparation, and relates to a cast-rolling pouring system which comprises a chute, a front box, a flow guide pipe, a flow distributor, an inner cooling water roller, a molten pool liquid level detector, a front box liquid level flow control mechanism, a stopper rod flow control mechanism in the front box and a PLC (Programmable Logic Controller) system, the molten pool liquid level detector is used for directly detecting the molten pool liquid level, the PLC control system is combined to adjust the position of the stopper rod, and accurate flow control is achieved; immersion type flow distribution is adopted for the flow distributor, and it is guaranteed that molten metal is evenly distributed; meanwhile, the system has the advantages of small liquid level fluctuation, quick response, stable casting and rolling process and the like, and is suitable for producing metal casting and rolling plates with high surface quality requirements; by optimizing the pouring speed and the flow control strategy, the system can achieve efficient and high-quality metal plate casting and rolling.

Description

Technical Field

[0001] This utility model belongs to the field of metal casting and rolling plate preparation, and relates to a casting and rolling pouring system. Background Technology

[0002] Casting and rolling is a production process in which molten metal is directly poured into a pair of casting rolls equipped with internal cooling water, and the metal sheet is directly formed through the cooling and rolling action of the casting rolls. Compared with traditional hot rolling or cold rolling processes, casting and rolling has significant advantages such as shorter process, higher efficiency, and lower energy consumption, and therefore has attracted much attention in the field of metal sheet and strip production.

[0003] In the casting and rolling process, molten metal enters between the casting rolls to form a molten pool. The flow, temperature distribution, and surface fluctuations of the molten metal directly affect the forming quality of the strip. Among these factors, surface fluctuation is one of the key factors influencing the stability of the casting and rolling process and the surface quality of the strip. Excessive surface fluctuation can intensify the impact of the molten metal on the solidification point, thereby affecting the surface quality of the strip and even causing defects such as oscillation marks and cracks. As casting and rolling speeds continue to increase, the difficulty of controlling the molten pool surface also increases. Traditional surface control methods often cannot meet the production demands of high-speed, high-quality production.

[0004] Currently, liquid level control in casting and rolling production mainly relies on flow regulation at the front end of the distributor. However, due to the limited space above the molten pool, liquid level fluctuations are difficult to detect and adjust in a timely manner, resulting in long response times and adjustment cycles for liquid level control. Furthermore, traditional liquid level control methods struggle to achieve precise level regulation, especially under high casting speeds, where large liquid level fluctuations can easily affect the surface quality and forming stability of the strip.

[0005] Therefore, developing a casting and rolling system capable of real-time detection of molten pool surface fluctuations, rapid response to level changes, and precise control is of great significance for improving the surface quality of cast and rolled strips, increasing production efficiency, and reducing energy consumption. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a casting and rolling system that solves the problems of inaccurate liquid level control in existing metal plate casting and rolling production, inability to respond to changes in the liquid level in the molten pool in a timely manner, long response time and cycle of liquid level fluctuation adjustment, and inability to meet the production requirements of high casting speed and high plate and strip surface requirements.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a casting and rolling system, comprising a chute, a front box, a guide pipe, a distributor, an internal cooling water roller, a molten pool level detector, a front box level control mechanism, a stopper rod control mechanism inside the front box, and a PLC system; the chute is horizontally arranged and connected to the front box, and the liquid level inside the front box is maintained stable by the front box level control mechanism; the bottom of the front box has an opening, the upper end of the guide pipe is sealed to the opening, and the lower end of the guide pipe is connected to the distributor; the stopper rod control mechanism includes a stopper rod and a driving mechanism, the stopper rod being movably inserted into... The flow rate of the guide pipe is controlled by adjusting the size of the opening at the bottom of the front box through the drive mechanism; the upper part of the distributor is a closed structure, and the lower part narrows to form a parallel channel, and there are distribution holes around its bottom. The distributor is immersed in the molten pool formed by the inner cooling water roller and the side sealing plate; the molten pool level detector is fixed on the outer side of the end of the distributor and is located 50-300mm above the molten pool surface; the inner cooling water roller is a pair of horizontally parallel metal rollers with a roller diameter of 500-1200mm. The two rollers form a gradually narrowing cavity channel to accommodate the molten metal and form a molten pool.

[0008] Optionally, the front tank liquid level control mechanism includes a refractory fiber float and a mechanical plug, which realizes automatic control of the front tank liquid level through buoyancy and mechanical linkage.

[0009] Optionally, the molten pool level detector is a laser detector or an eddy current detector, and its detection signal is connected to the PLC system. The PLC system is linked with the drive mechanism signal of the stopper rod flow control mechanism.

[0010] Optionally, the flow distribution holes of the flow distributor are evenly distributed around its bottom, adopting an immersion flow distribution design, and the diameter of the flow distribution holes gradually decreases along the direction of the molten pool flow.

[0011] Optionally, the gap width of the internal cooling water roller is 3-10mm, and the liquid level height of the molten pool is controlled within the range of 50-500mm.

[0012] Optionally, the surfaces of the chute, front box, guide pipe, distributor and stopper are all coated with a high-temperature resistant ceramic coating, and the preheating temperature is not lower than 100℃; the preheating temperature of the internal cooling water roller is not lower than 40℃.

[0013] Optionally, the side sealing plate is sealed to the end face of the inner cooling water roller to form a closed sidewall of the cavity channel. The side sealing plate is made of high-temperature resistant alloy or graphite composite material.

[0014] Optionally, the guide tube is a segmented, detachable structure with guide grooves on its inner wall to reduce the resistance to the flow of molten metal.

[0015] Optionally, the driving mechanism of the stopper rod flow control mechanism is a servo motor or a hydraulic cylinder, which realizes the vertical movement of the stopper rod through a linear guide rail.

[0016] Optionally, the system is suitable for cast steel, aluminum, magnesium, titanium or copper alloy metal sheets.

[0017] The beneficial effects of this utility model are as follows:

[0018] (1) This utility model directly detects the liquid level in the melting pool, controls the flow rate at the front end of the distributor, makes the liquid level control more direct and accurate, the liquid level adjustment response more rapid and efficient, and the surface quality of the produced products is higher.

[0019] (2) This invention produces less liquid level fluctuation and more stable liquid surface during casting and rolling production. There are no cooling vibration marks on the surface of the metal and the casting roll, making it suitable for producing metal casting and rolling plates with high surface requirements.

[0020] (3) The present invention has small liquid level fluctuations during casting and rolling production, less disturbance to the metal in the molten pool, less impact on solidification and welding points, and is more conducive to the stability of the casting and rolling process, thus realizing high-speed casting and rolling.

[0021] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0024] Attached reference numerals: 1. Sluice box; 2. Front box level control mechanism; 3. Guide pipe; 4. Distributor; 5. Internal cooling water roller; 6. Molten pool level detector; 7. Stopper rod control mechanism; 8. Detailed Implementation

[0025] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0026] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0027] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0028] Please see Figure 1 A casting and rolling system includes a chute 1, a front box 2, a front box liquid level control mechanism 3, a guide pipe 4, a distributor 5, an internal cooling water roller 6, a molten pool liquid level detector 7, and a stopper rod control mechanism 8 inside the front box.

[0029] In this system, a pair of horizontally parallel internally cooled metal casting rollers are arranged with a certain gap between them. The two casting rollers and the side sealing plates on the roller end faces together form a gradually narrowing cavity channel. During operation, a certain amount of molten metal is carried in the cavity channel to form a molten pool. The chute 1 and the front box 2 are arranged horizontally. The front box 2 maintains a certain amount of molten metal. The flow rate of the channel between the chute 1 and the front box 2 is controlled by a float flow control mechanism to maintain a stable liquid level in the front box. The bottom of the front box 2 has an opening and is connected to the guide pipe 4. A stopper rod for controlling the flow rate is inserted into the opening at the bottom of the front box. The stopper rod moves up and down through a moving mechanism to adjust the size of the opening at the bottom of the front box. The lower part of the guide pipe 4 is connected to the distributor 5. The upper part of the distributor 5 is closed on all sides to carry the molten metal; the lower part narrows to form a parallel channel with flow holes for the molten metal to flow around it and is immersed in the molten pool. A molten pool level detector 7 is arranged above the molten pool, located on the outer side of the end of the distributor 5. The detection signal from the molten pool level detector 7 is transmitted to the PLC system, and then the position of the stopper rod is controlled by the stopper rod adjustment mechanism to adjust the opening degree, control the flow rate of the guide pipe 4, and keep the molten pool level at the working position.

[0030] In this invention, the liquid level detection source can be either laser or eddy current. The liquid level detector 7 is directly arranged above the molten pool in the casting and rolling zone, on the outer side of the end of the distributor 5. The liquid level detector 7 is 50-300mm above the molten pool. The liquid level detection signal is associated with the stopper rod control mechanism, and the flow is controlled by the stopper rod control mechanism above the distributor 5.

[0031] In the operation of this system, at the start of casting, the gap between the casting rolls is closed, and the stopper rod opens to pour at a relatively large flow rate, which is 2 to 10 times the outlet working flow rate, quickly filling the molten pool and establishing the liquid level. When the liquid level is close to the target level, the stopper rod control mechanism adjusts the stopper rod to pour at a small flow rate, which is no more than twice the outlet working flow rate. At the same time, the casting rolls are turned on to control the flow rate, stabilizing the molten pool level, with fluctuations not exceeding 1 mm. When establishing the molten pool level, the liquid level in the front box is automatically controlled within the working range by the front box liquid level control mechanism 3.

[0032] In this invention, the actuator of the molten pool level detector 7 moves with the liquid level. When the molten pool level is higher than the target level and the distance between it and the molten pool level detector is less than 30mm, the level detector moves with the liquid level. When the liquid level returns to normal, the level detector also returns to its initial position. The internal cooling metal casting rollers are arranged horizontally in parallel, with a roller diameter of 500-1200mm, and the liquid level in the molten pool is controlled at 50-500mm. The front box liquid level control mechanism 3 uses a combination of refractory fiber floats and mechanical plugs for automatic flow control. The bottom of the distributor 5 has distribution holes around the perimeter for the flow of molten metal, using an immersion distribution method.

[0033] In this invention, before casting and rolling, the chute 1, front box 2, stopper rod, flow distributor 5, and casting roll are preheated. The preheating temperature of the chute 1, front box 2, stopper rod, and flow distributor 5 is greater than 100℃, and the preheating temperature of the casting roll is greater than 40℃. The metal used for casting and rolling is any one of steel, aluminum, magnesium, titanium, or copper alloy. Specific Implementation Example 1:

[0035] A pair of horizontally parallel internally cooled metal casting rolls, each with a diameter of 800mm and a 5mm gap between them, are arranged horizontally. A chute 1 and a front box 2 are horizontally arranged, with the front box 2 maintaining a certain amount of molten metal. The flow rate between the chute 1 and the front box 2 is controlled by a float-controlled flow mechanism to maintain a stable liquid level in the front box. The bottom of the front box 2 has an opening connected to a guide pipe 4. A stopper rod for controlling the flow rate is inserted into the opening at the bottom of the front box, and the stopper rod moves up and down via a moving mechanism to adjust the size of the opening at the bottom of the front box. The lower part of the guide pipe 4 is connected to a distributor 5. The upper part of the distributor 5 is enclosed on all sides to carry the molten metal; the lower part narrows to form a parallel channel with flow holes around it for the molten metal to flow through, and it is immersed in the molten pool. A molten pool level detector 7 is arranged above the molten pool, 70mm above the pool, located on the outer side of the end of the distributor 5.

[0036] Before casting and rolling, the chute 1, front box 2, stopper rod, flow distributor 5, and casting rolls must be preheated. The preheating temperature of the chute 1, front box 2, stopper rod, and flow distributor 5 is 180℃, and the preheating temperature of the casting rolls is 60℃.

[0037] The alloy used for casting is aluminum alloy 1100. At the start of casting, the casting roll gap is closed, and the stopper rod is opened to pour at a relatively high flow rate, five times the outlet working flow rate, quickly filling the molten pool and establishing a liquid level. The liquid level is controlled at 250mm. When the liquid level is close to the target level, the roll gap is opened, and the stopper rod control mechanism adjusts the stopper rod to pour at a low flow rate, 1.2 times the outlet working flow rate. Simultaneously, the casting rolls are turned on to control the flow rate, stabilizing the molten pool level with fluctuations below 0.5mm. During the establishment of the molten pool level, the front box liquid level is automatically controlled within the working range by the front box liquid level control mechanism 3. The cast aluminum plate has no vibration marks on its surface and exhibits good surface quality. Specific Implementation Example 2:

[0039] A pair of horizontally parallel internally cooled metal casting rolls, each with a diameter of 900 mm and a 3 mm gap between them, are arranged horizontally. A chute 1 and a front box 2 are horizontally arranged, with the front box 2 maintaining a certain amount of molten metal. The flow rate between the chute 1 and the front box 2 is controlled by a float-based flow control mechanism to maintain a stable liquid level in the front box. The bottom of the front box 2 has an opening connected to a guide pipe 4. A stopper rod for controlling the flow rate is inserted into the opening at the bottom of the front box, and the stopper rod moves up and down via a moving mechanism to adjust the size of the opening at the bottom of the front box. The lower part of the guide pipe 4 is connected to a distributor 5. The upper part of the distributor 5 is enclosed on all four sides to carry the molten metal; the lower part narrows to form a parallel channel with flow holes around it for the molten metal to flow through, and it is immersed in the molten pool. A molten pool level detector 7 is arranged above the molten pool, 80 mm above it, located on the outer side of the end of the distributor 5.

[0040] Before casting and rolling, the chute 1, front box 2, stopper rod, flow distributor 5, and casting rolls must be preheated. The preheating temperature of the chute 1, front box 2, stopper rod, and flow distributor 5 is 345℃, and the preheating temperature of the casting rolls is 55℃.

[0041] The alloy used for casting is Q235 steel. At the start of casting, the casting roll gap is closed, and the stopper rod is opened to pour at a relatively high flow rate, four times the outlet working flow rate, quickly filling the molten pool and establishing a liquid level. The liquid level is controlled at 300mm. When the liquid level is close to the target level, the roll gap is opened, and the stopper rod control mechanism adjusts the stopper rod to pour at a low flow rate, 1.2 times the outlet working flow rate. Simultaneously, the casting rolls are turned on to control the flow rate, stabilizing the molten pool level, with fluctuations below 0.7mm. During the establishment of the molten pool level, the front box liquid level is automatically controlled within the working range by the front box liquid level control mechanism 3. The cast steel plate has no vibration marks on its surface and exhibits good surface quality.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A casting and rolling gating system, characterized in that: It includes a chute, a front box, a guide pipe, a distributor, an internal cooling water roller, a molten pool level detector, a front box level control mechanism, a stopper rod control mechanism inside the front box, and a PLC system. The chute is horizontally arranged and connected to the front box. The front box maintains a stable liquid level through the front box level control mechanism. The bottom of the front box has an opening, the upper end of the guide pipe is sealed to the opening, and the lower end of the guide pipe is connected to the distributor. The stopper rod control mechanism includes a stopper rod and a drive mechanism. The stopper rod is movably inserted into the opening at the bottom of the front box, and the size of the opening is adjusted by the drive mechanism to control the flow rate of the guide pipe. The upper part of the distributor is a closed structure, and the lower part narrows to form a parallel channel. The bottom of the distributor is provided with distribution holes around its perimeter. The distributor is immersed in the molten pool formed by the inner cooling water roller and the side sealing plate. The molten pool level detector is fixed on the outer side of the end of the distributor and is located 50-300mm above the molten pool surface. The inner cooling water roller is a pair of horizontally parallel metal rollers with a roller diameter of 500-1200mm. The two rollers form a gradually narrowing cavity channel to accommodate the molten metal and form a molten pool.

2. The casting and rolling gating system according to claim 1, characterized in that: The front tank liquid level control mechanism includes a refractory fiber float and a mechanical plug, which achieves automatic control of the front tank liquid level through buoyancy and mechanical linkage.

3. The casting and rolling gating system according to claim 1, characterized in that: The molten pool level detector is a laser detector or an eddy current detector. Its detection signal is connected to the PLC system, and the PLC system is linked with the drive mechanism signal of the stopper rod flow control mechanism.

4. The casting and rolling gating system according to claim 1, characterized in that: The flow distribution holes of the flow distributor are evenly distributed around its bottom, and it adopts an immersion flow distribution design. The diameter of the flow distribution holes gradually decreases along the direction of the molten pool flow.

5. A casting and rolling gating system according to claim 1, characterized in that: The gap width of the internal cooling water roller is 3-10mm, and the liquid level height of the molten pool is controlled within the range of 50-500mm.

6. A casting and rolling gating system according to claim 1, characterized in that: The surfaces of the chute, front box, guide pipe, distributor and stopper are all coated with high-temperature resistant ceramic coating, and the preheating temperature is not lower than 100℃; the preheating temperature of the internal cooling water roller is not lower than 40℃.

7. A casting and rolling gating system according to claim 1, characterized in that: The side sealing plate is sealed to the end face of the inner cooling water roller to form a closed side wall of the cavity channel. The side sealing plate is made of high-temperature resistant alloy or graphite composite material.

8. A casting and rolling gating system according to claim 1, characterized in that: The guide tube has a segmented and detachable structure, and its inner wall is provided with a guide groove to reduce the resistance to the flow of molten metal.

9. A casting and rolling gating system according to claim 1, characterized in that: The stopper rod flow control mechanism is driven by a servo motor or hydraulic cylinder, and the vertical movement of the stopper rod is achieved through a linear guide rail.

10. A casting and rolling gating system according to claim 1, characterized in that: The system is suitable for cast and rolled steel, aluminum, magnesium, titanium or copper alloy metal plates.

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