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
  • B21B45/02—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 lubricating, cooling, or cleaning
  • B21B45/0203—Cooling
  • B21B45/0209—Cooling devices, e.g. using gaseous coolants
  • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
  • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
• • G—PHYSICS
  • G05—CONTROLLING; REGULATING
  • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
  • G05D7/00—Control of flow
  • G05D7/06—Control of flow characterised by the use of electric means
  • G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
  • G05D7/0623—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the set value given to the control element
• • G—PHYSICS
  • G05—CONTROLLING; REGULATING
  • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
  • G05D7/00—Control of flow
  • G05D7/06—Control of flow characterised by the use of electric means
  • G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
  • G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
  • G05D7/0635—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on throttling means
  • G05D7/0641—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on throttling means using a plurality of throttling means
  • G05D7/0652—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on throttling means using a plurality of throttling means the plurality of throttling means being arranged in parallel
• • 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
  • B21B45/02—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 lubricating, cooling, or cleaning
  • B21B45/0203—Cooling
  • B21B45/0209—Cooling devices, e.g. using gaseous coolants
  • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
  • B21B45/0233—Spray nozzles, Nozzle headers; Spray systems

Definitions

• the invention relates to a cooling group of a laminar cooling device, of which at least one is arranged above and below a belt to be cooled to act on the band with a cooling liquid, comprising a central inlet, is supplied via the cooling liquid, supplied from the central inlet with cooling liquid distributor pipe and a number of admission units, which are supplied with cooling fluid from the distributor tube, wherein a plurality of cooling nozzles is arranged on each loading unit, is applied via the cooling liquid on the tape.
• a generic laminar cooling device (laminar cooling section) is divided into individual cooling groups for cooling rolled metal strip.
• Each cooling group consists of a central inlet and a manifold, which opens into at least four or more loading units (chilled beams), which are arranged above or below the metal strip to be cooled.
• the groups which are arranged immediately after the rolling process are preferably filled with a higher flow rate than those located at the cooling end or those which are arranged shortly before the reel.
• Generic cooling devices disclose, for example, CN 103861879, CN 102397888, CN 102513385 and CN 203419952 U.
• Setting a defined cooling curve requires a specific cooling strategy according to which individual admission units of a cooling group release the amounts of water so that the predetermined cooling curve is reached and at changing process parameters (for example change in rolling speed or final rolling temperature) the desired target temperature during reeling (reel temperature) is maintained.
• process parameters for example change in rolling speed or final rolling temperature
• the desired target temperature during reeling reeling
• a flow control is arranged before each admission unit.
• the desired amount is then set regardless of the form.
• the invention is therefore based on the object of designing a laminar cooling device of the type mentioned at the outset such that the influence of the number of adjacent or switched off admission units to the flow rate and amount of water remains minimal. Here, however, care must be taken to ensure that the investment costs remain as low as possible.
• the solution to this problem by the invention is characterized in that a volume flow control valve is arranged in or in front of the central inlet, with which a defined volume of cooling liquid per time is passed through the central inlet.
• the laminar cooling device is preferably designed to conduct a volume flow between 30 and 200 m 3 / m 2 h per band side by means of a device arranged above or below the band to be cooled.
• the cross section of the distributor tube and the cross section of the loading units are preferably in a ratio of at least 1.0; particularly preferably, a ratio of at least 1.5 is provided for the ratio.
• this is preferably formed so that the ratio of the flow velocity in the manifold to the flow velocity in the loading unit in the range between 0.6 and 3.0.
• the ratio of the flow velocity in the distributor tube to the flow velocity in the loading unit is preferably in the range between 0.2 and 1.0.
• the Reynolds number in the central inlet, in the distributor tube and / or and in the application units is preferably between 2,000 and 3,000.
• the Reynolds number is the product of the density of the cooling medium with the flow velocity and the characteristic length (reference length) of the flow-through body divided by the dynamic viscosity of the cooling medium.
• the laminar cooling device is preferably designed such that the pressure in an admission unit arranged above the belt is kept above 0.05 bar.
• the adjustment of the flow control valve is preferred from the relationship
• Admission units (4.1, 4.2, ).
• the desired volume flow is controlled with a controlled system, with which the volume flow control valve is changed in its setting, preferably taking into account a correction value for flow rate adjustment.
• the cooling water quantity of each admission unit is calculated in accordance with the specification of a cooling strategy known per se.
• the total coolant requirement results according to the above formula from the sum of the cooling water quantities of the individual admission units (1 to n).
• Cooling water quantity of the individual admission units can be the same or different in the individual units.
• At least six, more preferably at least eight, impingement units are preferably arranged consecutively in a cooling group in the conveying direction of the strip.
• the proposed concept accordingly aims to set before each cooling group a flow control valve, which regulates the desired flow rate in the group regardless of the form. Furthermore, the
• Diameter ratios cross-sectional ratios of the leads to the chilled beams selected in a special way. This ensures that the activation or deactivation of charging units (regardless of the constellation) of the group has no influence on the local flow rate of a single charging unit.
• a group-controlled cooling section in which a specific Beaufschlagungsmenge is provided between 30 and 200 m 3 / m 2 h per band side.
• the cross-sectional ratio between manifold / chilled beam is at least 1, 0, preferably at least 1.5.
• the speed ratio between manifold / loading unit of upper cooling group is preferably between 0.6 and 3.0; that of the lower cooling group is preferably between 0.2 and 1.0.
• the operating pressure of the upper impingement unit is at least 0.050 bar, that of the lower impingement unit is at least 0.025 bar.
• a cooling system for cooling a slab or a belt is provided with which an improved cooling effect can be achieved
• the flow of the coolant is measured and regulated directly so that a given value of the volume flow can be precisely maintained.
• at least one controlled system is provided to control a flow rate range.
• at least one flow meter and at least one control valve are provided, which are arranged at corresponding positions of the supply line.
• the amount of coolant and the applied surface can be varied.
• the cooling system and its cooling capacity are preferably integrated into a process model.
• the single FIGURE shows a schematic representation of a cooling group of a laminar cooling device, which cools the top of a belt, not shown.
• the cooling group of a laminar cooling device 1 comprises in the exemplary embodiment five loading units 4 in the form of cooling bars which are arranged successively in the conveying direction F of the belt (not shown).
• 6 to 8 admission units 4 are combined to form a cooling group.
• the chilled beams 4 are provided with a plurality of cooling nozzles 5 which apply coolant from above to the belt (not shown).
• the supply of coolant takes place through a central inlet 2 from which a distributor pipe 3 is supplied with coolant. From the manifold 3, the coolant reaches the chilled beams 4.
• a volume flow control valve 6 is arranged, with which a defined volume of cooling liquid per time is passed through the central inlet 2.
• the flow through the central inlet is measured directly by means of the flow measurement 7 and regulated on the basis of the measurement result.
• one controlled system 8 is provided, in which the measured actual value is compared with the desired value and optionally with a correction value (Korr.)
• the control valve 6 is changed in its setting.
• at least one flow meter and / or a control valve are used on separate lines.
• individual admission units 4.n can be adjusted in their flow rate, but can also be switched on or off. Thereby not only the cooling rate, but also the application area can be varied.
• the valve 9 may also be formed as a pure switching valve (on / off) for the exclusive setting of the button.
• the amount of coolant and the loading surface can be varied.
• the control device regulates against the back pressure (at least 40% of the total pressure loss) a diaphragm and thus allows a continuous, volume-controlled water supply, in particular between 40% and 100% of the total amount of water.
• the desired switching state can be checked or monitored in the automation.
• a functionality for checking the functional unit of the cooling device or the loading units can be provided.
• an active reaction can be enabled during operation in the context of a process model. In the maintenance cycle malfunctions can be detected.
• the complete water management can be integrated and the pump control can be carried out via the calculated and adjusted water quantities. So only the amount of mass necessary for the cooling task is released by the pumps.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Automation & Control Theory (AREA)
• Heat Treatment Of Strip Materials And Filament Materials (AREA)
• Control Of Metal Rolling (AREA)

Priority Applications (4)

Applications Claiming Priority (4)

Publications (1)

Family

ID=67701738

Family Applications (1)

Country Status (6)

Families Citing this family (1)

Citations (8)

Family Cites Families (15)

• 2018
  • 2018-11-12 DE DE102018219276.6A patent/DE102018219276A1/de active Pending
• 2019
  • 2019-02-07 EP EP19704295.5A patent/EP3765216B1/de active Active
  • 2019-02-07 CN CN201980018198.7A patent/CN111836687B/zh active Active
  • 2019-02-07 WO PCT/EP2019/053000 patent/WO2019174826A1/de not_active Ceased
  • 2019-02-07 JP JP2020548822A patent/JP7125500B2/ja active Active
  • 2019-02-07 US US16/980,699 patent/US11745237B2/en active Active

Patent Citations (8)

Also Published As

Similar Documents

Legal Events