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Descaling assembly

A technology for descaling and equipment, applied in metal processing equipment, workpiece surface treatment equipment, metal rolling, etc., can solve problems such as reducing power and increasing water pressure, reducing load, improving energy saving, and improving power grid characteristics Effect

Inactive Publication Date: 2013-04-17
PRIMETALS TECH GERMANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the conveying flow is reduced, the water pressure is simultaneously increased, so that the power is reduced only slightly

Method used

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  • Descaling assembly
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Examples

Experimental program
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Embodiment Construction

[0030] exist figure 1 shows the two winding systems of the pump motor M, where they are arranged in a so-called star / double star connection. exist figure 1 On the left, a four-pole first winding system is shown in star connection. Two windings are respectively arranged in series in each branch of the star structure. At the ends of the branches there are first stator connections 1U, 1V, 1W. Between every two windings of a branch there is a second stator connection 2U, 2V, 2W. During operation with the first winding system, only the first stator connections 1U, 1V, 1W are connected to the supply voltage.

[0031] By separating the first stator connections 1U, 1V, 1W from the supply voltage and interconnecting them, a bipolar second winding system is produced. Furthermore, the second stator connections 2U, 2V, 2W are connected to the supply voltage. This results in a double star connection. During star connection with the first winding system, the electric machine runs at ...

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Abstract

The invention relates to a descaling system for descaling in hot rolling mills, comprising at least one hydraulic pump (P1) which is driven by means of a pump motor (M). Here, the pump motor (M) is configured as a pole-changing motor and is connected to a controller (STR) which is set up for pole changing between descaling times and descaling pauses. A considerable amount of energy is saved in this way during a descaling pause, by the rotational speed of the pump motor (M) being reduced by means of pole changing.

Description

technical field [0001] The invention relates to a descaling plant for descaling in a hot rolling mill, comprising at least one hydraulic pump driven by means of a pump motor. The invention also relates to a method for operating a descaling plant. Background technique [0002] Hydraulic descaling plants (descalers) are an almost indispensible component of hot rolling mills. The descaling of the rolled product surface is achieved by spraying water under high pressure onto the surface of the material with a special nozzle. The development of thin slab casting and rolling equipment requires higher and higher operating pressures. Descaling plants are currently operating at operating pressures between 180bar and 400bar. Centrifugal or piston pumps are used to generate pressure. A disadvantage of piston pumps is uneven delivery, which causes pressure fluctuations or pressure pulsations at the pump outlet. [0003] In a centrifugal pump the operating characteristics are directl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B45/06B21B45/08
CPCB21B45/08
Inventor J.格奥尔基
Owner PRIMETALS TECH GERMANY