Guiding device for metal strip output from rolling mill

Abstract

The invention belongs to the technical field of metal calendaring, and relates to a guiding device for a metal belt output from a rolling mill, which comprises a guiding device arranged above a conveying roller way, the guiding device is composed of a plurality of embossing rollers arranged in parallel along the movement direction of the metal belt, and each embossing roller is provided with a plurality of roller rings. The distance between the surface of the roller ring and the metal belt conveying roller way is larger than the thickness of the metal belt so that the metal belt can pass through the conveying roller way. The rigidity and stability of the guiding device are improved, deformation is smaller, reliable operation can be kept even in the high-temperature environment of high-speed rolling, powerful support is provided for stable conveying of the metal thin strip, meanwhile, the maintenance and replacement cost in operation of a production line is effectively reduced, and economical efficiency and practicability of the guiding device are embodied.

Description

Technical Field

[0001] The invention belongs to the technical field of metal rolling and relates to a guiding device for a metal strip output from a rolling mill. Background Art

[0002] In the field of headless rolling technology, the non-continuous operation problems such as threading and tail swinging in the traditional single-block rolling process have been effectively solved by constant tension rolling technology. The hot rolling technology innovation represented by the ESP (headless strip production) production line has achieved low-cost, large-scale and stable production of thin and ultra-thin plate and strip steel through compact process design. This technical system has outstanding performance in improving the yield rate. Its energy-saving and emission-reduction characteristics and the process advantages of "thin instead of thick, hot instead of cold" have significantly reduced the energy consumption and carbon emissions per unit product. In the core process link of the ESP production line, the thin strip steel after being cut to length needs to be coiled at high speed through the coiling unit. However, the existing coiling system has a significant technical bottleneck: when the strip head enters the coiling machine, due to the insufficient rigidity of the strip steel, it is very easy to produce instability phenomena such as warping, vacancy, stacking and winding under high-speed operation, which seriously restricts the production capacity and increases maintenance costs.

[0003] In view of the above problems, the existing technology proposes to use belt transmission to solve the related problems. The existing improvement scheme mainly has two types of technical defects: first, although the high-temperature resistant belt transmission system can improve the running stability of the strip steel, the belt material ages rapidly in a high temperature environment, and its replacement cycle is short and the cost of a single replacement is high, resulting in a significant decrease in the economic efficiency of operation and maintenance; second, there is also a technology that replaces the belt with a number of traction rollers set at intervals to guide the thin metal strip. At the same time, in order to prevent the metal strip from passing through between adjacent traction rollers, a limit unit is set. However, when the interval traction roller group scheme is adopted, the limit unit set to prevent the strip steel from escaping from the roller gap forces the traction roller spacing to expand, resulting in the traction force presenting a non-continuous pulse characteristic, and the occurrence of intermittent instability cannot be avoided, which may cause problems such as warping, vacancy, stacking and winding.

[0004] The above technical contradictions reflect the lack of adaptability of the existing coiling guidance system under the triple constraints of high temperature, high speed and ultra-thin specifications. How to achieve continuous and stable guidance of the strip during the coiling process while taking into account the equipment's temperature resistance, operating economy and process reliability has become a key technical bottleneck restricting the improvement of the efficiency of headless rolling technology. Summary of the invention

[0005] In view of this, the object of the present invention is to provide a guiding device for a metal strip output from a rolling mill, so as to provide continuous friction for the metal strip head that is lifted up and warped during rapid movement, quickly flatten the metal strip head, and avoid problems such as warping, lifting, stacking and winding of the metal strip caused by the speed difference between the head and subsequent parts of the metal strip.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A guiding device for a metal strip output from a rolling mill comprises a guiding device arranged above a conveying roller, the guiding device being composed of a plurality of pattern rollers arranged in parallel along the moving direction of the metal strip, each pattern roller being provided with a plurality of roller rings, the distance between the roller ring surface and the metal strip conveying roller being greater than the thickness of the metal strip, so that the metal strip can pass on the conveying roller.

[0008] Furthermore, the central axes of several pattern rollers are arranged in parallel and located in the same plane, which is parallel to or at a certain angle to the conveying roller surface; in the parallel state, the distance between each pattern roller and the roller surface is constant; in the angled state, the distance between the pattern roller and the conveying roller surface gradually decreases along the moving direction of the metal strip.

[0009] Furthermore, the linear speed of the roller ring of the pattern roller during operation is greater than or equal to the production movement speed of the metal strip, so as to provide friction for the head of the metal strip that is in the air or warped upward, and quickly pull the head of the metal strip.

[0010] Furthermore, the linear speed of the roller ring of the pattern roller during operation does not exceed 1.5 times the production movement speed of the metal strip.

[0011] Furthermore, the roller rings between adjacent pattern rollers are arranged in a staggered manner to ensure the continuity of friction.

[0012] Furthermore, the pattern roller spacing D between adjacent pattern rollers is greater than the sum of the pattern roller shaft radius R and the roller ring radius r, and the pattern roller gap s between adjacent pattern rollers is the thickness value of the metal belt.

[0013] Furthermore, the number of roller rings of the first and last flower rollers in the guiding device is at least 2, and the number of roller rings of adjacent flower rollers differs by 1.

[0014] Furthermore, the roller ring in the flower roller adopts a hollow design and is made of high-temperature resistant steel to reduce the weight of the flower roller.

[0015] Furthermore, the conveying roller is a plurality of staggeredly arranged pattern rollers to enhance the supporting effect on the metal belt.

[0016] The beneficial effects of the present invention are:

[0017] 1. The present invention provides a guiding device for a metal strip output from a rolling mill, adopting a rigidly connected flower roll structure for conveying thin metal strips output from the rolling mill. Compared with traditional belt guiding devices, this design significantly improves the stiffness and stability of the device, with less deformation, and can operate reliably even in the high-temperature environment of high-speed rolling. The flower roll collar is made of high-temperature resistant steel, which not only has excellent heat resistance and a much longer service life than high-temperature resistant belts, but also greatly reduces production costs. The combination of this rigid structure and high durability provides strong support for the smooth conveying of thin metal strips, while effectively reducing maintenance and replacement costs during the operation of the production line, reflecting its economic efficiency and practicality.

[0018] 2. Compared with traditional guiding devices with a limiting plate arranged between traction rolls, the present invention adopts a flower roll design with a hollowed-out collar, which is lighter in weight, reduces equipment energy consumption, and has significant innovation. Due to the limiting plate, the friction between adjacent rolls of traditional traction rolls is discontinuous, and problems such as upward warping, levitation, stacking, and winding are likely to occur during the high-speed movement of thin metal strips. However, through the staggered arrangement of adjacent flower roll collars in the present invention, continuous friction is provided, effectively flattening the head of the thin strip and enabling it to quickly pass through the strip into the coiler. This design not only avoids production accidents caused by speed differences, but also reduces downtime and reject rates caused by failed threading, greatly improving production efficiency, and fully demonstrating the innovative advantages of the technical solution in solving practical problems.

[0019] 3. The present invention further replaces the traditional conveying roller path with a staggered flower roll path, optimizing the support and conveying path of thin metal strips. The traditional roller path is prone to causing strip jamming due to the gaps between the rollers, while the staggered design of the flower roll path effectively avoids this problem, ensuring the smoothness and continuity of the thin strip during transmission. This improvement not only enhances the operating efficiency of the production line, but also strengthens the practicality of the device, enabling it to better adapt to high-speed and high-load working conditions in actual production, fully reflecting the practical value of this technical solution in improving the overall production performance.

[0020] Other advantages, objectives, and features of the present invention will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be learned from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in preferred detail below in conjunction with the drawings, where:

[0022] Figure 1 It is a side view of the outlet section of a continuous hot rolling equipment containing a guiding device for a metal strip output from a rolling mill;

[0023] Figure 2 Front view of a guiding device for a metal strip output from a rolling mill in Embodiment 1;

[0024] Figure 3 Top view of a guiding device for a metal strip output from a rolling mill in Embodiment 1;

[0025] Figure 4 Cross-sectional view of the first and second patterned rollers in Embodiment 1;

[0026] Figure 5 Cooperating state diagram of the guiding device with the pinch rolls at the flying shear outlet and the metal strip conveying roller table in Embodiment 1;

[0027] Figure 6 Cooperating state diagram of the guiding device with the pinch rolls at the flying shear outlet and the metal strip conveying roller table in Embodiment 2;

[0028] Figure 7 Structural schematic diagram of the metal strip conveying roller table in Embodiment 2.

[0029] Reference numerals: metal strip 1, pinch rolls at the flying shear inlet 2, flying shear 3, pinch rolls at the flying shear outlet 4, metal strip conveying roller table 5, first guiding device 6, first pinch / steering roll 7, first coiler 701, second guiding device 8, second pinch / steering roll 9, second coiler 901;

[0030] First guiding device 6: first patterned roller 61, second patterned roller 62, third patterned roller 63, fourth patterned roller 64, fifth patterned roller 65, sixth patterned roller 66, seventh patterned roller 67, eighth patterned roller 68, ninth patterned roller 69, first patterned roller ring 611, second patterned roller ring 621. Detailed implementation manners

[0031] The following illustrates the implementation manners of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present invention schematically. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0032] Among them, the accompanying drawings are only for illustrative purposes, showing only schematic diagrams rather than actual diagrams, and should not be construed as limiting the present invention; in order to better illustrate the embodiments of the present invention, some components in the accompanying drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0033] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings. This 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 operated in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0034] Embodiment 1

[0035] This embodiment provides a guiding device for a metal strip output from a rolling mill. As Figure 1 shown, the first guiding device 6 is arranged above the metal strip conveying roller table 5 and is used to guide the metal strip 1 output from the pinch roll 2 at the flying shear inlet, which has been sheared by the flying shear 3, to smoothly enter the first pinch / turning roll 7 and the first coiler 701.

[0036] 1.1 Structure of the guiding device

[0037] As Figure 2 and Figure 3 shown, the first guiding device 6 is composed of nine pattern rolls, namely the first pattern roll 61, the second pattern roll 62, the third pattern roll 63, the fourth pattern roll 64, the fifth pattern roll 65, the sixth pattern roll 66, the seventh pattern roll 67, the eighth pattern roll 68 and the ninth pattern roll 69. These pattern rolls are arranged in parallel along the moving direction of the metal strip 1, and their central axes are located in the same plane, and this plane is parallel to the roller table surface of the metal strip conveying roller table 5, that is, the distance between each pattern roll and the roller table surface remains constant.

[0038] Each pattern roller is provided with a number of roller rings. For example, the first pattern roller 61 is provided with four first pattern roller rings 611, the second pattern roller 62 is provided with three second pattern roller rings 621, the third pattern roller 63 is provided with four third pattern roller rings, and so on. The number of roller rings of adjacent pattern rollers differs by one, and the number of roller rings of the first and last pattern rollers (i.e., the first pattern roller 61 and the ninth pattern roller 69) are both four, so as to ensure that the guiding force of the guide device on the metal strip 1 is evenly distributed. The density of the traction force of the guide device can be adjusted by the number of roller rings of a single pattern roller. The more roller rings there are, the smoother the traction of the guide device.

[0039] like Figure 4 As shown, the cross-sectional view of the first pattern roller 61 and the second pattern roller 62 shows that the first pattern roller ring 611 and the second pattern roller ring 621 (i.e., roller rings) adopt a hollow design to reduce the weight of the pattern roller and reduce the power consumption of the equipment. At the same time, the roller rings between adjacent pattern rollers are staggered to ensure that the friction provided by the roller rings continuously acts on the metal belt 1 during the movement of the metal belt 1, avoiding the unstable guidance caused by intermittent friction.

[0040] 1.2 Working principle of the guidance device

[0041] like Figure 5 As shown, after the metal strip 1 is output from the pinch roller 4 at the flying shear outlet, it enters the metal strip conveying roller 5. During the conveying process, due to the speed difference between the head and the subsequent parts of the metal strip 1, it is easy to warp up or float. The first guiding device 6 provides downward friction to the metal strip 1 through the roller ring on the pattern roller to prevent it from warping up or floating.

[0042] Specifically, the pattern roller is connected to a driving device (such as a motor or a hydraulic motor) for driving it to rotate around the axis, and the linear speed of the roller ring of the pattern roller when working is set to be greater than or equal to the production movement speed of the metal strip 1, and not more than 1.5 times. For example, if the production speed of the metal strip 1 is 10m / s, the linear speed of the roller ring can be set between 10m / s and 15m / s. In this way, when the head of the metal strip 1 contacts the roller ring, the roller ring can quickly flatten the strip head to ensure that the metal strip 1 passes smoothly through the conveyor roller 5.

[0043] 1.3 Parameter setting

[0044] In this embodiment, the spacing D between adjacent pattern rollers is set to be greater than the sum of the pattern roller shaft radius R and the roller ring radius r, so as to ensure that there is sufficient pattern roller gap s between adjacent pattern rollers. The pattern roller gap s is usually taken as the thickness value of the metal belt 1. For example, if the thickness of the metal belt 1 is 2mm, the gap s is set to 2mm, the pattern roller shaft radius R is 50mm, and the roller ring radius r is 20mm, then the spacing D should be greater than 70mm, and can be specifically set to 72mm.

[0045] In addition, the distance between the flower roll and the conveying roller path 5 is adjustable to adapt to metal strips 1 of different thicknesses. Generally, the distance between the surface of the roller ring and the metal strip 1 is set to be slightly greater than the thickness of the metal strip 1. For example, for a metal strip with a thickness of 2 mm, the distance can be set to 2.5 mm to ensure that the metal strip 1 can pass through smoothly, and at the same time, the roller ring can contact the metal strip 1 to provide a guiding force when needed.

[0046] For the metal strip 1, its width W1 should be less than the sum of the width W of the roller ring multiplied by 4 and the spacing H of the roller rings multiplied by 3 to ensure that the guiding force of the flower roll completely covers the metal strip.

[0047] 1.4 Arrangement of the guiding device

[0048] In this embodiment, the flower rolls of the first guiding device 6 are arranged in parallel, that is, the distances between all the flower rolls and the conveying roller path 5 are kept the same, and the rotation direction is counterclockwise (so that the moving direction of the end of the roller ring close to the conveying roller path 5 is the same as the moving direction of the metal strip 1), as Figure 5 shown. This arrangement is suitable for the case where the thickness of the metal strip 1 is uniform and the production speed is stable, and can provide a uniform guiding force. It should be noted that on the premise of ensuring the guiding effect, the distance between the flower roll and the conveying roller path is adjustable so that the metal strip 1 can pass through the conveying roller path quickly.

[0049] Furthermore, a second guiding device 8, a second pinch / turning roller 9, and a second coiler 901 cooperating with the second pinch / turning roller 9 are provided behind the first pinch / turning roller 7. When the coiling of the first coiler 701 is completed, the metal strip 1 can be guided into the second coiler 901 through the first pinch / turning roller 7, the second guiding device 8, and the second pinch / turning roller 9 for coiling, thereby realizing the alternate coiling of the first coiler 701 and the second coiler 901.

[0050] Furthermore, since the temperature during the operation of the guiding device is between 500 °C and 800 °C, the flower roll is made of high-temperature resistant steel (such as cobalt-based superalloy, 2520 stainless steel, ferritic oxidation-resistant steel, etc.), and its heat-resistant temperature is not lower than 800 °C.

[0051] Embodiment 2

[0052] This embodiment provides another guiding device for the metal strip output from the rolling mill. The main difference from Embodiment 1 lies in the arrangement method of the flower roll and the structure of the conveying roller path.

[0053] 2.1 Inclined arrangement of the guiding device

[0054] As Figure 6As shown, in this embodiment, the plane where the central axis of the flower roller of the first guiding device 6 is located forms a certain angle α with the roller surface of the conveying roller path 5. The angle α can be adjusted according to actual needs, for example, set to 5°. Specifically, along the moving direction of the metal strip 1, the distance between the flower roller and the conveying roller path 5 gradually decreases. For example, the distance between the first flower roller 61 and the roller surface is 10 mm, and the distance between the ninth flower roller 69 and the roller surface decreases to 5 mm. This inclined arrangement can better adapt to the upward warping trend of the metal strip 1 in the initial stage of movement, and provide a stronger guiding force through the gradually decreasing distance to ensure that the head of the metal strip 1 can be quickly flattened.

[0055] 2.2 Improvement of the Conveying Roller Path

[0056] As Figure 7 shown, in this embodiment, the conveying roller path 5 in this embodiment uses a number of flower rollers arranged in a staggered manner to replace the traditional roller path structure (i.e., an analogous transformation of the metal strip guiding device). These flower rollers are similar to the flower rollers in the first guiding device 6, but are arranged below the metal strip 1 for supporting and conveying the metal strip 1. For example, the conveying roller path 5 can include five flower rollers. The first flower roller is provided with four roller rings, and the difference in the number of roller rings between adjacent flower rollers is 1, and the roller rings are arranged in a staggered manner. Through this design, the conveying roller path 5 can provide a more uniform supporting force and prevent the metal strip 1 from getting stuck between the rollers during conveying.

[0057] 2.3 Working Principle and Parameter Setting

[0058] Similar to Embodiment 1, the first guiding device 6 in this embodiment provides a guiding force for the metal strip 1 through the roller rings on the flower roller. The linear speed of the flower roller is set to be greater than or equal to the production movement speed of the metal strip 1 and not exceed 1.5 times. For example, when the production speed is 12 m / s, the linear speed can be set to 12 m / s to 18 m / s. The gap s between adjacent flower rollers still takes the thickness value of the metal strip 1. For example, for a metal strip with a thickness of 1.5 mm, the gap s is 1.5 mm.

[0059] Compared with Embodiment 1, this embodiment can better adapt to the dynamic changes of the metal strip 1 during high-speed movement through the inclined arrangement of the flower roller and the improved conveying roller path structure, and provide a more stable and effective guiding effect, which is particularly suitable for the production of ultra-thin metal strips, such as metal strips with a thickness less than 1 mm.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the present technical solution, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A guiding device for a metal strip discharged from a rolling mill, characterized in that It includes a guiding device arranged above the conveying roller, which is composed of a plurality of pattern rollers arranged in parallel along the moving direction of the metal belt. Each pattern roller is provided with a plurality of roller rings. The distance between the roller ring surface and the metal belt conveying roller is greater than the thickness of the metal belt, so that the metal belt can pass on the conveying roller.

2. The guiding device according to claim 1, characterized in that The central axes of several pattern rollers are arranged in parallel and located in the same plane, which is parallel to the conveying roller surface or forms a certain angle with it; in the parallel state, the distance between each pattern roller and the roller surface is constant; in the angled state, the distance between the pattern roller and the conveying roller surface gradually decreases along the moving direction of the metal strip.

3. The guiding device according to claim 1, characterized in that The roller ring of the pattern roller has a linear speed greater than or equal to the production speed of the metal strip when in operation, so as to provide friction force for the head of the metal strip that is in the air or warped upward, and quickly pull the head of the metal strip.

4. The guiding device according to claim 1, characterized in that The linear speed of the roller ring of the pattern roller when working does not exceed 1.5 times the production movement speed of the metal strip.

5. The guiding device according to claim 1, characterized in that The roller rings between adjacent pattern rollers are arranged in a staggered manner to ensure the continuity of friction.

6. The guiding device according to claim 1, characterized in that The spacing D between adjacent pattern rollers is greater than the sum of the pattern roller shaft radius R and the roller ring radius r, and the pattern roller gap s between adjacent pattern rollers is the thickness value of the metal belt.

7. The guiding device according to claim 1, characterized in that The number of roller rings of the first and last pattern rollers in the guiding device is at least 2, and the number of roller rings of adjacent pattern rollers differs by 1.

8. The guiding device according to claim 1, characterized in that The roller ring in the flower roller adopts a hollow design and is made of high-temperature resistant steel to reduce the weight of the flower roller.

9. The guiding device according to claim 1, characterized in that The conveying roller is a plurality of staggeredly arranged pattern rollers to enhance the supporting effect on the metal belt.

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