Method for improving plate blank transportation efficiency and reliability in sizing machine area

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By spot welding of threaded steel bars at the roller inlet of the fixed width machine and local cooling, the problem of slipping and jamming at the inlet of the fixed width machine is solved, the transportation efficiency and stability are improved, and the roller surface wear is reduced.

CN119951878APending Publication Date: 2025-05-09SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE

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Patent Information

Application Number: CN202411863671.0
Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner
Filing Date: 2024-12-17
Publication Date: 2025-05-09

AI Technical Summary

Technical Problem

At the entrance of the fixed width machine of the hot rolling production line, the slab is prone to mass defects such as slippage and resistance, which affects the stability of the subsequent rolling process, and the roller surface wears rapidly, affecting transportation efficiency.

Method used

The curved threaded steel bars are spot welded in obliquely in the length direction at the inlet roller of the fixed width machine and the lower roller surface of the pinch roller to increase the roughness of the roller surface, and a cooling water pipe is installed at the roller group and the roller neck of the pinch roller to achieve local cooling through the nozzle to maintain the roller surface temperature.

Benefits of technology

The friction between the roller track and the pinch roller is improved, the stability and efficiency of slab conveying are improved, the roller surface wear is reduced, and the slippage and the clamping resistance of the slab at the inlet of the fixed width machine are avoided, ensuring the stability of the subsequent rolling process.

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Abstract

The invention discloses a method for improving plate blank transportation efficiency and reliability in a width fixing machine area, which comprises the following steps of: obliquely spot-welding bent threaded steel bars on an inlet roller way of a width fixing machine and a roller surface of a lower roller of a pinch roller at intervals along the length direction, and enabling the threaded steel bars to obliquely and uniformly wrap the roller way surface; cooling water pipelines are arranged on the working side and the transmission side of the width fixing machine front and rear roller way sets and the pinch roll, cooling water branch pipes are arranged at the roll necks of the width fixing machine front and rear roller way sets and the pinch roll through a supporting fixing frame, one ends of the cooling water branch pipes are communicated with the cooling water pipelines, the other ends of the cooling water branch pipes are provided with sprayers, and the sprayers directly face the roll necks. According to the set control logic, the front and rear roller bed groups of the width fixing machine and the roller neck parts of the pinch rollers are cooled through the nozzles, so that local cooling is realized, and the roller surface temperature is kept. The method improves the friction force of the roller surface of the width fixing machine, improves the capability of the roller way for conveying the plate blank to the width fixing machine, effectively reduces the abrasion of the roller surface of the width fixing machine, prevents the plate blank from slipping and jamming at the inlet of the width fixing machine, and ensures the stability of the plate blank in the subsequent rolling process.

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Description

Technical Field

[0001] The invention relates to the technical field of material conveying equipment in the metallurgical industry, and in particular to a method for improving the efficiency and reliability of slab transportation in a width setting machine area. Background Art

[0002] At present, the hot rolling production line slabs are transported by roller conveyor. The high-temperature slabs are drawn out from the heating furnace by a steel drawing machine, placed on the first set of rollers, and passed through a descaling box to remove impurities such as surface oxide scale. They are then transported forward to the entrance of the width fixing machine and sent into side pressure rolling, while the pinch rollers and the lower rollers provide assistance.

[0003] The width setting machine is an important equipment in the hot-rolled strip production line. Its function is to increase the width reduction of the slab in the hot rolling process, so that the same width of slab can be used to produce products of different widths, thereby improving the production efficiency of the continuous casting process. In the width setting process, the slab often has quality defects such as jamming, slipping, head warping, and arching due to the incoming material shape, which affects the stability of the subsequent rolling process.

[0004] In the actual rolling process of the width mill of the hot rolling production line, the slab is transported to the entrance of the width mill by rollers after the descaling step is completed, and the side pressure rolling is completed by matching the speed of the rollers with the side pressure module of the width mill and the entrance pinch rollers.

[0005] Since the slab is thicker at this position and the horizontal surface contacts the roller less, the surface of a single roller must be subjected to greater pressure and friction. At the same time, due to the plate shape, temperature and actual status of the upstream incoming slab and the on-site equipment, the slab often slips and gets stuck at the entrance of the width setting machine during the on-site production process, and the width setting rolling cannot be carried out normally. When the operator finds out and manually pours the steel back into the furnace or hangs the slab, it will cause a lot of unplanned downtime and affect production capacity.

[0006] At the same time, the rollers before and after the width setting machine are cooled by roller body cooling, which has the advantage of keeping the roller temperature at a low range. Even if the slab stays on the roller for a long time, the roller temperature will not rise too high and cause the roller to lock. However, its disadvantage is that the roller surface wears quickly, especially the roller surface that is in direct contact with the slab. Over time, the roller surface is worn into a concave arc surface in the middle, making the slabs of different widths have different elevations on the roller, resulting in different biting ability of the pinch roller and roller friction. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a method for improving the efficiency and reliability of slab transportation in the width gauge area. The method improves the friction of the roller table and the lower roller surface of the pinch roller at the entrance of the width gauge, increases the roller surface roughness, and improves the ability of the roller table to transport slabs to the width gauge. At the same time, it effectively reduces the wear of the front and rear roller tables and the pinch roller surface of the width gauge, avoids the slab from slipping and getting stuck at the entrance of the width gauge, and ensures the stability of the subsequent rolling process of the slab.

[0008] In order to solve the above technical problems, the method for improving the slab transportation efficiency and reliability in the width setting machine area of the present invention comprises the following steps: Step 1: spot weld the bent threaded steel bars at intervals along the length direction on the roller surface of the entrance roller table and the lower roller of the pinch roller of the width setting machine, so that the threaded steel bars evenly wrap the roller surface obliquely; Step 2: Cooling water pipelines are laid out on the working side and transmission side of the front and rear roller table groups and the pinch rollers of the width setting machine, and cooling water manifolds are set at the roll necks of the front and rear roller table groups and the pinch rollers of the width setting machine through a supporting fixed frame. One end of the cooling water manifold is connected to the cooling water pipeline, and a nozzle is set at the other end, and the nozzle is directly facing the roll neck position; Step 3: According to the set control logic, the nozzle is used to cool the front and rear roller sets of the width setting machine and the roller neck of the pinch roller to achieve local cooling and maintain the roller surface temperature.

[0009] Furthermore, the threaded steel bar is spirally wrapped around the roller surface by spot welding.

[0010] Furthermore, the diameter of the threaded steel bar is 8 mm, and the spacing between the rollers is 10 cm.

[0011] Since the method for improving the slab transportation efficiency and reliability in the width setting machine area of the present invention adopts the above-mentioned technical scheme, that is, the method obliquely spot welds the bent threaded steel bars at intervals along the length direction on the roller surface of the entrance roller and the lower roller of the pinch roller of the width setting machine, so that the threaded steel bars obliquely and evenly wrap the roller surface; cooling water pipelines are arranged on the working side and the transmission side of the front and rear roller groups and the pinch rollers of the width setting machine, and cooling water pipes are arranged at the roller necks of the front and rear roller groups and the pinch rollers of the width setting machine through a supporting fixed frame, one end of the cooling water pipe is connected to the cooling water pipeline, and a nozzle is arranged at the other end, and the nozzle is directly opposite to the roller neck position; the roller necks of the front and rear roller groups and the pinch rollers of the width setting machine are cooled by the nozzle according to the set control logic, so as to achieve local cooling and maintain the roller surface temperature. The method improves the friction force of the roller table and the lower roller surface of the pinch roller at the width setting machine entrance, increases the roller surface roughness, and improves the ability of the roller table to convey the slab to the width setting machine. At the same time, it effectively reduces the roller surface wear of the front and rear roller table groups and the pinch rollers of the width setting machine, avoids the slab from slipping and getting stuck at the width setting machine entrance, and ensures the stability of the subsequent rolling process of the slab. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments: Figure 1 Schematic diagram of the arrangement of the threaded steel bar and roll neck cooling structure in this method. DETAILED DESCRIPTION

[0013] Implementation example Figure 1 As shown, the method for improving the slab transportation efficiency and reliability in the width setting machine area of the present invention comprises the following steps: Step 1: spot weld the bent threaded steel bars 2 at intervals along the length direction on the roller surface 1 of the entrance roller table and the lower roller of the pinch roller of the width setting machine, so that the threaded steel bars 2 evenly wrap the roller surface 1 obliquely; Step 2: Cooling water pipelines 3 are arranged on the working side and the transmission side of the front and rear roller sets and the pinch rollers of the width setting machine, and cooling water manifolds 5 are arranged at the roll necks 11 of the front and rear roller sets and the pinch rollers of the width setting machine through the supporting fixed frame 4. One end of the cooling water manifold 5 is connected to the cooling water pipeline 3, and a nozzle 6 is arranged at the other end, and the nozzle 6 is directly facing the roll neck 11; Step 3: According to the set control logic, the nozzle 6 is used to cool the front and rear roller sets of the width setting machine and the roller neck 11 of the pinch roller to achieve local cooling and maintain the roller surface temperature.

[0014] Preferably, the threaded steel bar 2 is spirally wrapped around the roller surface 1 by spot welding.

[0015] Preferably, the diameter of the threaded steel bars 2 is 8 mm, and the spacing on the roller surface 1 is 10 cm.

[0016] This method improves the friction of the roller surfaces of the front and rear rollers of the width setting machine to solve the problem of slipping caused by the inability of the slab to fully contact the rollers when the slab is transported to the width setting machine. The roller surface is roughened by electric welding and steel bars in the longitudinal direction to increase the roughness of the roller surface of the pinch roller at the entrance of the width setting machine, improve the friction of the roller, ensure that the conveying force of the roller motor can be transmitted to the slab, and improve the ability of the width setting machine to transport the slab.

[0017] In order to solve the defects of fast wear and short service life of the widening mill roller, the cooling method of the roller is transformed into a local cooling method of the roller neck. After the original cooling method of the roller surface is cancelled, the temperature of the roller surface can always be maintained at a high temperature. On the one hand, the roller surface lacks water flushing, which greatly reduces the roller surface wear; on the other hand, when the roller is in contact with the slab, the temperature drop on the lower surface of the slab is reduced, the uniformity of the slab temperature is improved, and the stability of the slab rolling process is ensured.

[0018] This method basically eliminates the phenomenon that the roller surface of the slab slips at the entrance of the width-fixing machine and cannot bite into the rolling machine normally, reduces the abnormal failure time on site, increases the on-site production capacity, and ensures the stability of the subsequent rolling process of the slab.

Claims

1. A method for improving the efficiency and reliability of slab transportation in the width setting machine area, characterized in that The steps include: Step 1: spot weld the bent threaded steel bars at intervals along the length direction on the roller surface of the entrance roller table and the lower roller of the pinch roller of the width setting machine, so that the threaded steel bars evenly wrap the roller surface obliquely; Step 2: Cooling water pipelines are laid out on the working side and transmission side of the front and rear roller table groups and the pinch rollers of the width setting machine, and cooling water manifolds are set at the roll necks of the front and rear roller table groups and the pinch rollers of the width setting machine through a supporting fixed frame. One end of the cooling water manifold is connected to the cooling water pipeline, and a nozzle is set at the other end, and the nozzle is directly facing the roll neck position; Step 3: According to the set control logic, the nozzle is used to cool the front and rear roller sets of the width setting machine and the roller neck of the pinch roller to achieve local cooling and maintain the roller surface temperature.

2. The method for improving the efficiency and reliability of slab transportation in the width setting machine area according to claim 1 is characterized in that: The threaded steel bar is spot welded to wrap the roller surface in a spiral shape.

3. The method for improving the slab transportation efficiency and reliability in the width setting machine area according to claim 1, characterized in that: The diameter of the threaded steel bar is 8 mm, and the distance between them on the roller surface is 10 cm.