A centralized transmission line bar rolling mill

Abstract

The invention discloses an integrated driving wire and bar mill. The wire and bar mill comprises a first roller box, a second roller box and a transmission, wherein the transmission comprises a first output shaft, a second output shaft, a middle shaft, an input shaft and an input gearshift fixedly connected with the input shaft, wherein the input shaft and the middle shaft are provided with two pairs of input gear pairs of different drive ratios; two middle gears with different numbers of teeth on the middle shaft are correspondingly engaged with two first gears on the first output shaft, the two middle gears are correspondingly engaged with two second gears on the second output shaft, a first gearshift which is used for switching different first gears and is fixedly connected with the first output shaft is arranged between two first gears, and a second gearshift which is used for switching different second gears and is fixedly connected with a second output shaft is arranged between two second gears; an output shaft is connected with an input shaft of a power plant. According to the integrated driving wire and bar mill provided by the invention, the roller boxes have a flexible speed ratio relationship under a condition of ensuring rolling mass flows per second to be equal, therefore the investment and use and maintenance cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of steel rolling equipment, in particular to a concentrated transmission line bar rolling mill. Background technique [0002] As the main equipment in the steel hot rolling production line, the rolling mill is used to roll the blank into shape, such as for the rolling of threaded steel bars, round steel, etc., and usually passes through rough rolling, intermediate rolling, pre-finishing rolling, finishing rolling, etc. Passes are rolled to produce finished products. [0003] At present, due to the high rolling speed of the finishing mill used for wire rod rolling, the rolling mill usually adopts the racks arranged alternately with the top of the roll to realize the non-twist rolling of the rolled piece, reduce the vibration and facilitate the replacement of the roll, and due to the requirement of the machine The distance between the racks is small and the flow rate of each rack is required to be equal durin...

AI Technical Summary

Problems solved by technology

[0004] This method well ensures that the second flow rate between the racks is equal, but the continuous multiple racks are driven by a main motor, resulting in a huge power of the main motor, and the need to use a high-voltage motor, which greatly increases the cost, and this kind of High-voltage large motors and their electrical control device technologies are mostly monopolized in the market, with high costs and difficult maintenance, making it difficult to be popularized and used

[0005] In addition, this multi-rack centralized transmission method, because its transmission chain is too long, its no-load power even reaches about thousands of kilowatts, resulting in a huge loss of energy consumption, especially now that steel production enterprises are increasingly competitive and difficult to survive In some cases, this kind of transmission mode and rolling mill with high investment cost and large energy loss cannot meet the needs of cost reduction, energy saving and emission reduction.

[0006] In this kind of centralized transmission, the gear speed ratio of each rolling mill is fixed, and the gear cannot be changed. Only the frequency conversion of the motor can be used to meet the wide range of rolling speed requirements from about 20m / s to 110m / s, and it is difficult to give full play to the performance of the motor. Efficacy, that is, it is difficult to achieve an effective matching output of torque and speed by shifting gears during rolling, and it is necessary to amplify the power of the motor to meet the rolling demand, resulting in loss

At the same time, since the speed ratio between the racks is fixed and driven by one motor, when the wear amount of the roll ring of one of the racks is more, that is, the diameter of the roll ring becomes smaller, and the linear speed of the roll ring becomes smaller, resulting in a second flow rate. The second flow rate of the adjacent rolling mill is less than that of the adjacent rolling mill, and piles of steel are generated. At this time, because the speed ratio of the rolling mill is fixed, and it is driven by a motor, the roll ring must be replaced, or even the roll ring of multiple stands can be re-established. The relationship between the flow rate per second is equal, and the normal rolling of steel will cause a large loss of roll rings, many spare parts, difficult maintenance, and a corresponding increase in rolling costs

Images