Vertical plate roll gap plugging device for vertical double-roll cast rolling and control method of vertical plate roll gap plugging device

Abstract

The invention discloses a vertical double-roll cast-rolling vertical plate roll gap plugging device and a control method thereof, the device comprises a swing arm, a swing arm driving device and a casting plug, one end of the swing arm is rotatably connected to a rolling mill stand or a foundation, and the other end of the swing arm is connected with the casting plug. The swing arm is controlled by the driving device to swing, so that the plug is clamped into or separated from the roll gap. The cast-on plug and the swing arm are connected through a round hole and a kidney-shaped hole, so that position fine adjustment and matched plugging with a roll gap can be achieved. The driving device is a hydraulic cylinder or an air cylinder with a pressure sensor, and stable plugging pressure is ensured. According to the control method, the opening time of the swing arm is controlled through a pressure sensor, a liquid level sensor or time, it is guaranteed that the metal strip flows out properly, and it is prevented that too thick solidification blocks a roll gap or causes rolling mill overload. The device is simple in structure and convenient to operate, the plate erecting efficiency and the finished product yield are improved, and the device is suitable for a high-speed thin strip casting and rolling scene and has high safety and economical efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of vertical twin-roller casting and rolling, and relates to a vertical twin-roller casting and rolling vertical plate roll gap blocking device and a control method thereof. Background Art

[0002] When the vertical twin-roll casting mill starts working, the molten metal solution is directly poured into the molten pool composed of two relatively rotating rolls and side sealing plates installed on the two end faces of the rolls. When the two rolls rotate relative to each other, a thin metal strip is cast and rolled out from the roll gap formed by the two rolls.

[0003] Because it is a vertical twin-roll casting and rolling mill, when the molten metal poured from the top is poured on the vertical plate, if there is no blocking measure, the molten metal will flow directly from the gap between the rolls and flow into the waste hopper just below the rolls, which is easy to splash and cause danger to nearby operators; or it will hit other equipment when flowing downward, damaging the equipment, or forming metal debris, affecting the operation of the equipment and damaging the surface of the metal strip rolled out later. The leaked molten metal causes waste, reduces the yield of finished products, and also causes a longer time for each vertical plate.

[0004] Some vertical casting and rolling mills are equipped with dummy rods, including rigid dummy rods that are lifted from the bottom and chain dummy rods that move in and out on an arc roller. Rigid dummy rods are long and have a large lifting stroke, requiring civil engineering to dig a pit to leave space for movement; for high-speed thin strip casting and rolling mills, the descent speed of the rigid dummy rod will hinder the plate and strip. The chain dummy rod equipment structure and operation are very complicated.

[0005] At the same time, due to the particularity of twin-roll casting, the timing of opening the dummy rod is very important. If it is opened too early, the molten metal has not yet solidified to form a shell and cannot play a sealing role; if it is opened too late, the molten metal solidifies too thickly on the rolls, resulting in excessive rolling force and even equipment jamming. Summary of the invention

[0006] In view of this, the purpose of the present invention is to solve the above problems and provide a vertical twin-roller casting and rolling vertical plate roll gap plugging device and a control method thereof. The plugging device is simple, relatively small, and opens quickly, and is suitable for high-speed thin strip casting and rolling applications. At the same time, a control method is provided to ensure that the plugging device opens at an accurate time and improves the vertical plate efficiency.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A vertical double-roller casting and rolling vertical plate roll gap plugging device, comprising a swing arm, a swing arm driving device and a pouring plug;

[0009] The swing arm is arranged on one side of the rolling mill, one end of the swing arm is rotatably connected to the frame arch or foundation of the rolling mill, and the other end is connected to the pouring plug; the swing arm driving device is connected to the swing arm, driving the swing arm to swing, thereby driving the pouring plug to be stuck under the roll gap between the rolling mills or to be detached from the roll gap.

[0010] Furthermore, two holes are provided at the connection between the swing arm and the pouring plug, one is a round hole and the other is a waist-shaped hole; the pouring plug is connected to the two holes through two pin shafts. When sealing the roller gap, the pouring plug swings in the waist-shaped hole with the round hole as the center to achieve fine-tuning of the position, thereby matching the roller gap.

[0011] Furthermore, the swing arm driving device is a hydraulic cylinder or a pneumatic cylinder with a pressure sensor; the swing arm driving device is hingedly mounted on the casting and rolling mill frame or on the frame base.

[0012] Furthermore, arc surfaces are provided on both sides of the end of the opening and pouring plug, and the arc surfaces match the outer circle of the roller to seal the roller gap.

[0013] A control method for the vertical twin-roll casting vertical plate roll gap blocking device as described above comprises the following steps:

[0014] S1: Before erecting the plate, adjust the roller gap distance according to the thickness of the metal strip to be produced;

[0015] S2: Control the swing arm driving device to drive the swing arm, drive the pouring plug to rise, and the pouring plug reaches the bottom of the roll gap. The pressure sensor of the swing arm driving device feeds back the pressure value, and determines that the pouring plug seals the roll gap with the set pressure.

[0016] S3: After the vertical slab is poured and the pouring reaches the preset conditions, the swing arm opens quickly to separate the pouring plug from the roller gap;

[0017] S4: The metal strip formed by casting and rolling flows out from the roll gap and the vertical plate is completed.

[0018] Furthermore, the preconditions in S3 are:

[0019] When the vertical plate is poured, the molten metal poured into the molten pool exerts a certain pressure on the pouring plug. At the same time, the billet shell formed by the cooling of the molten metal in the molten pool also exerts a certain force on the pouring plug under the rotation of the roller. The combined force of the two forces is finally transmitted to the swing arm drive device. When the increase value of the pressure sensor of the swing arm drive device reaches the set value, the swing arm opens quickly; or:

[0020] When the vertical plate starts pouring, the level of the molten metal poured into the molten pool is detected by the molten pool level sensor. When the level reaches the set value, the swing arm opens quickly; or:

[0021] When the vertical plate starts to be poured, the pouring time of the molten metal is recorded. When the time reaches the set value, the swing arm opens quickly.

[0022] The beneficial effects of the present invention are:

[0023] 1. In a traditional vertical twin-roll casting mill, if there is no reliable plugging device, molten metal will leak from the gap between the rolls when casting begins, resulting in a waste of time and materials. The present invention uses a casting plug driven by a swing arm to accurately plug the gap between the rolls, effectively preventing the leakage of molten metal and improving the efficiency of plate erection. At the same time, by reasonably controlling the opening timing of the casting plug (with the help of a pressure sensor, a liquid level sensor or time control), it ensures that the metal strip flows out smoothly after proper solidification, improves the success rate of plate erection, and avoids production failures caused by premature or delayed opening of the plug.

[0024] 2. Compared with the traditional dummy rod structure, the blocking device of the present invention is simple in design and reduces the need for complex mechanical structures.

[0025] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0027] Figure 1 It is a schematic diagram of the vertical twin-roller casting and rolling plate roll gap sealing device of the present invention.

[0028] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0029] Figure 3 It is a flow chart of the control method of the present invention.

[0030] Figure numerals: 1-casting and rolling mill; 2-arch; 3-roller; 4-molten metal; 5-roller gap; 6-swing arm; 7-swing arm driving device; 8-casting plug; 8-1-round hole; 8-2-waist-shaped hole; 9-liquid level sensor. DETAILED DESCRIPTION

[0031] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0032] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0033] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0034] See also Figures 1 to 3 , is a device for sealing the roll gap 5 of a vertical twin-roll casting mill 1, mainly comprising a swing arm 6, a swing arm driving device 7 and a casting plug 8. The swing arm driving device 7 is connected to the swing arm 6; the casting plug 8 is connected to the swing arm 6 at the end of the swing arm 6, and two holes are set at the connection, one is a round hole 8-1, and the other is a waist-shaped hole 8-2. Since the two rolls 3 need to move to adjust the roll gap 5, the two rolls 3 are not strictly symmetrical along the center of the roll gap 5. At this time, when the casting plug 8 is sealing the roll gap 5, the casting plug 8 will slightly rotate around the round hole 8-1, and the waist-shaped hole 8-2 leaves a swing space for fine adjustment.

[0035] The swing arm 6 is mounted on the frame arch 2 of the casting and rolling mill 1. The swing arm driving device 7 is a hydraulic cylinder or a pneumatic cylinder with a pressure sensor; the other end of the swing arm driving device 7 is hingedly mounted on the frame of the casting and rolling mill 1 or on the frame base.

[0036] The control method of the roll gap blocking device of the vertical twin-roll casting mill in this embodiment comprises the following steps:

[0037] S1: Before the plate is erected, the roller gap 5 distance is adjusted according to the thickness of the metal strip to be produced. This step can be omitted if the roller gap does not need to be adjusted;

[0038] S2: The swing arm driving device 7 drives the swing arm 6 to lift the pouring plug 8, and the pouring plug 8 reaches the bottom of the roll gap 5. The pressure sensor of the swing arm driving device 7 feeds back the pressure value to determine that the pouring plug 8 blocks the roll gap 5 with a certain pressure.

[0039] S3: After the vertical slab is poured, when the pouring reaches the preset condition, the swing arm 6 is quickly opened to separate the pouring plug 8 from the roller gap 5; wherein the preset condition may be any one of the following S31, S32, and S33;

[0040] S31. After the vertical plate is poured, the molten metal 4 poured into the molten pool generates a certain pressure on the opening of the pouring plug 8. At the same time, the billet shell formed by the cooling of the molten metal 4 in the molten pool also generates a certain force on the opening of the pouring plug 8 under the rotation of the rolling roller 3. The combined force of the two forces is finally transmitted to the swing arm drive device 7. When the increased value of the pressure sensor of the swing arm drive device 7 reaches the set value, the swing arm 6 opens quickly.

[0041] S32. After the vertical plate is poured, the liquid level of the molten metal 4 poured into the molten pool is detected by the molten pool level sensor 9. When the liquid level reaches the set value, the swing arm 6 opens quickly.

[0042] S33, after the vertical plate starts to be poured, the pouring time of the molten metal 4 is recorded, and when the time reaches the set value, the swing arm 6 opens quickly.

[0043] S4: The metal strip formed by casting and rolling flows out from the roll gap 5, and the vertical plate is completed.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A vertical twin-roller casting and rolling vertical plate roll gap plugging device, characterized in that: It includes a swing arm, a swing arm driving device and a pouring plug; The swing arm is arranged on one side of the rolling mill, one end of the swing arm is rotatably connected to the frame arch or foundation of the rolling mill, and the other end is connected to the pouring plug; the swing arm driving device is connected to the swing arm, driving the swing arm to swing, thereby driving the pouring plug to be stuck under the roll gap between the rolling mills or to be detached from the roll gap.

2. The vertical twin-roll casting and rolling vertical plate roll gap plugging device according to claim 1 is characterized in that: Two holes are provided at the connection between the swing arm and the pouring plug, one is a round hole and the other is a waist-shaped hole; the pouring plug is connected to the two holes through two pin shafts. When sealing the roller gap, the pouring plug swings in the waist-shaped hole with the round hole as the center to achieve fine position adjustment to match the roller gap.

3. The vertical twin-roll casting vertical plate roll gap plugging device according to claim 1, characterized in that: The swing arm driving device is a hydraulic cylinder or a pneumatic cylinder with a pressure sensor; the swing arm driving device is hingedly mounted on the casting and rolling mill frame or on the frame base.

4. The vertical twin-roll casting and rolling vertical plate roll gap plugging device according to claim 1, characterized in that: The ends of the pouring plug are provided with arc surfaces on both sides, and the arc surfaces match the outer circle of the roller to seal the roller gap.

5. A control method for a vertical twin-roll casting vertical plate roll gap plugging device according to any one of claims 1 to 4, characterized in that: The steps include: S1: Before erecting the plate, adjust the roller gap distance according to the thickness of the metal strip to be produced; S2: Control the swing arm driving device to drive the swing arm, drive the pouring plug to rise, and the pouring plug reaches the bottom of the roll gap. The pressure sensor of the swing arm driving device feeds back the pressure value, and determines that the pouring plug seals the roll gap with the set pressure. S3: After the vertical slab is poured and the pouring reaches the preset conditions, the swing arm opens quickly to separate the pouring plug from the roller gap; S4: The metal strip formed by casting and rolling flows out from the roll gap and the vertical plate is completed.

6. The control method of the vertical twin-roll casting vertical plate roll gap plugging device according to claim 5, characterized in that: The preset conditions in S3 are: When the vertical plate is poured, the molten metal poured into the molten pool exerts a certain pressure on the pouring plug. At the same time, the billet shell formed by the cooling of the molten metal in the molten pool also exerts a certain force on the pouring plug under the rotation of the roller. The combined force of the two forces is finally transmitted to the swing arm drive device. When the increase value of the pressure sensor of the swing arm drive device reaches the set value, the swing arm opens quickly. or: When the vertical plate starts pouring, the liquid level of the molten metal poured into the molten pool is detected by the molten pool level sensor. When the liquid level reaches the set value, the swing arm opens quickly. or: When the vertical plate starts to be poured, the pouring time of the molten metal is recorded. When the time reaches the set value, the swing arm opens quickly.

Images