Device and method for improving special steel bar marshalling sizing precision

Abstract

The invention relates to a device for improving special steel bar marshalling sizing precision. The device comprises a sizing rack, a sizing baffle, a baffle lifting device and a baffle displacement device, wherein the sizing baffle, the baffle lifting device and the baffle displacement device are arranged on the sizing rack; the baffle lifting device comprises a lifting hydraulic cylinder and a crank connecting rod; one end of the crank connecting rod is hinged with a piston rod of the lifting hydraulic rod, and the other end of the crank connecting rod is hinged with the sizing baffle; the bent part of the crank connecting rod is hinged with the inner wall of the sizing rack; the baffle displacement device comprises two pushing mechanisms, and the two pushing mechanisms are both hinged to the sizing baffle; each pushing mechanism comprises a displacement hydraulic cylinder and a connecting rod; one end of each connecting rod is hinged with a piston rod of the corresponding displacement hydraulic cylinder, and the other end of each connecting rod is hinged with the sizing baffle; and the lifting hydraulic cylinder and the displacement hydraulic cylinders are controlled by a PLC control system. According to the device, the transverse temperature deviation and the longitudinal temperature deviation of the marshalled multiple-length base metal are compensated, and the sizing precision of a sizing machine is greatly improved.

Description

technical field [0001] The invention relates to the technical field of on-line finishing of metallurgical steel rolling, more specifically, it relates to a device and method for improving the precision of grouping and sizing of special steel bars. Background technique [0002] For large and medium-sized bars of special steel, the length of each billet after rolling varies from more than 100 meters to 500 or 600 meters, and the final rolling temperature is generally 900-950°C. The finished billets are cut into 60-110m long base metals by flying shears. The base metals are thrown by the throwing device and then distributed in rows on the cooling bed or traverse device. After air cooling or heat preservation Carry out grouping, and the number of double-foot parent materials in each group ranges from several to dozens of pieces. The grouped double-foot parent materials are sawed or cut by sawing machine or shearing machine, and the sawn or sheared The length of the finished bar...

AI Technical Summary

Problems solved by technology

[0005] When shearing or sawing in the prior art, the position of the fixed-length baffle is fixed. During the cutting process, the length of the double-length parent material shrinks due to the continuous drop in temperature. In addition, the position of the fixed-length baffle is According to the length from the cut-to-size baffle to the sawing or shearing center line plus the preset cold shrinkage, but the preset shrinkage is determined based on the overall shrinkage of the double-size base material and the number of cutting segments, which does not conform to the actual production situation , will cause the length of the finished product after cutting to be uneven after it is completely cooled

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