EP2605872A2 - Installation de décalaminage - Google Patents

Installation de décalaminage

Info

Publication number
EP2605872A2
EP2605872A2 EP11732419.4A EP11732419A EP2605872A2 EP 2605872 A2 EP2605872 A2 EP 2605872A2 EP 11732419 A EP11732419 A EP 11732419A EP 2605872 A2 EP2605872 A2 EP 2605872A2
Authority
EP
European Patent Office
Prior art keywords
pump motor
entzunderungsanlage
winding
descaling
pole
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP11732419.4A
Other languages
German (de)
English (en)
Other versions
EP2605872B1 (fr
Inventor
Jens Georgi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Primetals Technologies Germany GmbH
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to EP11732419.4A priority Critical patent/EP2605872B1/fr
Publication of EP2605872A2 publication Critical patent/EP2605872A2/fr
Application granted granted Critical
Publication of EP2605872B1 publication Critical patent/EP2605872B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically

Definitions

  • the invention relates to a descaling plant for
  • Descaling in hot rolling mills comprising at least one hydraulic pump driven by a pump motor.
  • the invention relates to a method for operating the Entzu matterssstrom.
  • Hydraulic descalers (Descaler) are almost indispensable components of hot rolling mills.
  • Descaling of a rolling stock surface occurs by blasting high pressure water onto the surface of the material by means of special nozzles.
  • a descaling system works today with an operating pressure between 180 bar and 400 bar.
  • the pressure is generated by a rotary or piston pump.
  • Impeller diameter Centrifugal pumps are characterized
  • Pump motor with a power range of 2000kW to 3000kW driven.
  • the pump motor is as
  • a usual supply voltage is in the range between 6kV and 10kV.
  • Throttle fitting and a bypass is a common and simple method, which causes low investment costs.
  • the invention is based, for a
  • this object is achieved by a
  • the descaling plant for descaling in hot rolling mills comprises at least one hydraulic pump, which is driven by means of a pump motor.
  • This pump motor is designed as a pole-changing motor and connected to a controller, which for pole change between
  • Descaling and descaling intervals is set up.
  • the stator of the pole-changing three-phase motor thus has at least two winding systems, which cause different speeds of the rotor.
  • a plurality of pumps are connected in parallel to generate pressure, each pump by means of a
  • pole-changing pump motor is driven.
  • a hot strip mill or a plate mill it makes sense if 2 to 3 pumps are used.
  • a pump will be in standby mode parallel to the in
  • each pump motor is controlled by a common control.
  • Descaling plants in rolling mills usually have a powerful one
  • each pump motor has two winding systems, which alternately by means of pole change to a
  • Supply voltage can be switched. It is advantageous if a first winding system of the respective pump motor is designed to have four poles and if a second winding system of the respective pump motor is designed with two poles. By switching from the second winding system to the first winding system thus the speed of the pump motor is halved. Such halving is enough to get one
  • the vacuum contactors are controlled by the control and allow far higher switching cycles than ordinary circuit breakers.
  • the respective pump motor is coupled to a speed sensor.
  • the determined engine speed is compared with the synchronous speed and avoided in this way over-synchronous deceleration.
  • the respective pump motor is briefly removed from the grid during a changeover.
  • the engine brakes down automatically.
  • the respective pump motor is briefly removed from the grid during a changeover.
  • the engine brakes down automatically.
  • the respective pump motor is briefly removed from the grid during a changeover.
  • the engine brakes down automatically.
  • the respective pump motor is briefly removed from the grid during a changeover.
  • winding systems of a respective pump motor are designed as two separately arranged winding systems.
  • the inventive method provides that two
  • Winding systems of a respective pump motor means
  • Control be switched alternately to a supply voltage.
  • Winding system is switched to the other winding system.
  • Fig. 1 star / double star connection of a stator
  • Fig. 3 shows two separate winding systems of a stator
  • Fig. 4 shows circuitry for a Polumscrien with
  • Fig. 5 Characteristics
  • two winding systems of a pump motor M are shown, wherein these are arranged in a so-called star / double star connection.
  • a four-pole first winding system is shown as a star connection.
  • first stator terminals 1U, IV, 1W are arranged in series.
  • second stator terminals 2U, 2V, 2W are connected to one
  • a two-pole second winding system is formed by the first stator terminals 1U, IV, 1W of the
  • Double star connection During star connection with the first winding system, the motor runs at a low speed. Switching to the double star connection with the second winding system causes a higher
  • the power ratio is about 0.3: 1.
  • a similar variant is the triangular
  • Triangular circuit again has two windings arranged in series. At the vertices of the triangle are the first stator terminals 1U, IV, 1W.
  • FIG. 2 shows an exemplary external connection of a Dahlander circuit.
  • the second stator terminals 2U, 2V, 2W can be connected via a first contactor Ql to the phases LI, L2, L3 of a supply voltage.
  • the first stator terminals 1U, IV, 1W can be connected to the phases LI, L2, L3 of a supply voltage via a second contactor Q2 and can be connected to one another via a third contactor Q3.
  • a motor protection switch QS1, QS2 is arranged in each case. Instead of two circuit breakers QS1, QS2 can only one
  • the preferred trained as vacuum contactors contactors Ql, Q2, Q3 and the circuit breaker are connected to a controller STR. This control is also the signal of a
  • the pole change takes place by means of the control STR.
  • the STR control monitors the starts and shifts, so that when switching from high speed to the lower speed does not come to super-synchronous braking.
  • the pump motor M is powered up by means of a pole change circuit, whereby the starter currents are significantly reduced compared to systems with fixed speed.
  • the controller is also set up to perform protection functions. These include about the
  • additional pumps P2, P3, PS are connected to the control STR.
  • some pumps PI, P2, Pn operate in normal mode and one pump PS in standby mode.
  • FIGS. 3 and 4 An alternative embodiment of the invention is shown in FIGS. 3 and 4.
  • Fig. 3 shows two separate winding systems of a stator. The four-pole first winding system shown on the left is a star connection with the first stator terminals 1U, IV, 1W. The right
  • bipolar winding system is a
  • Fig. 4 shows an exemplary structure of a circuit for switching between two separate winding systems.
  • two contactors Ql, Q2 are arranged, by means of which in each case a winding system to the phases LI, L2, L3 a
  • Supply voltage can be switched.
  • supply voltage can be switched.
  • Fig. 5 the characteristics of a pump PI, P2, Pn, PS and a Entzu matterssstrom are shown.
  • a head H is indicated above a flow Q.
  • the lower diagram shows the pump or motor power L over the flow rate Q.
  • the system curve A does not change. Due to the pole changeover from a higher speed to a lower speed, however, the pump characteristic curve W1, W2 changes.
  • the delivery head If the delivery rate is reduced from 100% to 50% during a descaling break, the delivery head also drops from 100% to, for example, 25%. The switching causes the
  • Power L drops from 100% to, for example, 12.5%.
  • a halving of the speed (for example 3000U / min to 1500U / min at 50Hz mains frequency) thus results in a considerable

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Control Of Ac Motors In General (AREA)
  • Metal Rolling (AREA)

Abstract

La présente invention concerne une installation de décalaminage conçue pour assurer le décalaminage dans des laminoirs à chaud, comprenant au moins une pompe hydraulique (P1) qui est entraînée par un moteur (M) de pompe. Le moteur (M) de pompe est un moteur à changement du nombre de pôles qui est relié à une commande (STR) conçue pour assurer le changement du nombre de pôles entre des moments de décalaminage et des pauses de décalaminage. On obtient ainsi une économie d'énergie considérable lors d'une pause de décalaminage, grâce à un régime réduit du moteur (M) de la pompe au moyen d'un changement du nombre de pôles.
EP11732419.4A 2010-08-18 2011-07-07 Installation de décalaminage Not-in-force EP2605872B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11732419.4A EP2605872B1 (fr) 2010-08-18 2011-07-07 Installation de décalaminage

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP10173232A EP2420329A1 (fr) 2010-08-18 2010-08-18 Installation d'allumage
EP11732419.4A EP2605872B1 (fr) 2010-08-18 2011-07-07 Installation de décalaminage
PCT/EP2011/061487 WO2012022536A2 (fr) 2010-08-18 2011-07-07 Installation de décalaminage

Publications (2)

Publication Number Publication Date
EP2605872A2 true EP2605872A2 (fr) 2013-06-26
EP2605872B1 EP2605872B1 (fr) 2016-01-20

Family

ID=43479622

Family Applications (2)

Application Number Title Priority Date Filing Date
EP10173232A Withdrawn EP2420329A1 (fr) 2010-08-18 2010-08-18 Installation d'allumage
EP11732419.4A Not-in-force EP2605872B1 (fr) 2010-08-18 2011-07-07 Installation de décalaminage

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP10173232A Withdrawn EP2420329A1 (fr) 2010-08-18 2010-08-18 Installation d'allumage

Country Status (3)

Country Link
EP (2) EP2420329A1 (fr)
CN (1) CN103052454B (fr)
WO (1) WO2012022536A2 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3231698B2 (ja) * 1998-03-19 2001-11-26 株式会社神戸製鋼所 表面性状の優れた熱延鋼板の製造方法
US6255755B1 (en) * 1998-06-04 2001-07-03 Renyan W. Fei Single phase three speed motor with shared windings
CN100563862C (zh) * 2007-11-12 2009-12-02 二重集团（德阳）重型装备股份有限公司 热连轧生产线的高压水除鳞系统
EP2174729A1 (fr) * 2008-10-07 2010-04-14 Siemens Aktiengesellschaft Dispositif d'allumage doté d'un entraînement de pompe à vitesse de rotation variable

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2012022536A2 *

Also Published As

Publication number Publication date
WO2012022536A2 (fr) 2012-02-23
CN103052454B (zh) 2015-09-02
WO2012022536A3 (fr) 2012-09-20
EP2605872B1 (fr) 2016-01-20
CN103052454A (zh) 2013-04-17
EP2420329A1 (fr) 2012-02-22

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