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WO2013001565A1 - Appareil de guidage de barres pour un équipement de coulée continue - Google Patents

Appareil de guidage de barres pour un équipement de coulée continue Download PDF

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Publication number
WO2013001565A1
WO2013001565A1 PCT/JP2011/003658 JP2011003658W WO2013001565A1 WO 2013001565 A1 WO2013001565 A1 WO 2013001565A1 JP 2011003658 W JP2011003658 W JP 2011003658W WO 2013001565 A1 WO2013001565 A1 WO 2013001565A1
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WO
WIPO (PCT)
Prior art keywords
drive
drive motor
rollers
strand
worm
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.)
Ceased
Application number
PCT/JP2011/003658
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English (en)
Inventor
Hiroshi Kawaguchi
Fumiki Asano
Kazunori Okada
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.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
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 Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to PCT/JP2011/003658 priority Critical patent/WO2013001565A1/fr
Publication of WO2013001565A1 publication Critical patent/WO2013001565A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1281—Vertical removing

Definitions

  • the present invention relates to a strand guiding apparatus installed in continuous casting equipment.
  • a metal strand is allowed to solidify while being withdrawn downward from a bottom of a mold using a strand guiding apparatus, thereby producing cast pieces such as billets and slabs.
  • strand guiding apparatuses Many patent documents refer to strand guiding apparatuses.
  • Patent Document 1 discloses a strand guiding apparatus including a plurality of pairs of drive rollers along a moving direction of a strand. Each pair of drive rollers is provided to sandwich the strand to drivingly guide the strand. The driving force from a drive motor is transmitted to each drive roller via a speed reducer.
  • a worm reducer is used as the speed reducer.
  • the first reason relates to the installation space limitation. Specifically, multi-strand continuous casting is carried out in continuous casting equipment of recent years in view of the productiveness, and casting is carried out in multi-strand continuous casting equipment with strand guiding apparatuses arranged in a horizontal direction. In other words, two strand guiding apparatuses are arranged on the opposite sides of one strand guiding apparatus. Accordingly, enough installation spaces for drive motors and the like cannot be obtained at lateral sides in many cases.
  • worm reducers which can transmit a driving force in an orthogonal direction, can eliminate the likelihood that a positional interference occurs between drive motors of one strand guiding apparatus and those of another strand guiding apparatus.
  • the second reason relates to the installation space of a worm reducer.
  • a large speed reduction ratio can be accomplished simply by reducing the lead angle of a worm without changing the outer dimensions of the speed reducer. Since a large speed reduction ratio can be accomplished by a worm reducer, high performance is not required for a primary speed reducer, which thus makes it possible to employ a smaller-sized primary speed reducer and a universal joint. Therefore, worm reducers capable of giving a large speed reduction ratio by a compact mechanism without taking up a large installation space are suitably used in multi-strand continuous casting equipment having a limited installation space.
  • the third reason relates to the prevention of strand drop.
  • a worm reducer having a large gear ratio of 1/40 to 1/60 will cause self-locking which is specific to a drive mechanism using a worm.
  • the drive roller cannot rotate the drive motor while the drive motor can rotate the drive roller.
  • the drive rollers are locked in a stopped state when the worm reducer causes self-locking, therefore there is no likelihood that the strand drops.
  • worm reducers whose gear ratios are conventionally set at a large value of 1/40 to 1/60 are preferably used particularly in vertical continuous casting equipment which is likely to receive the weight of strand.
  • worm reducers used in continuous casting equipment are normally set at such a large gear ratio that self-locking is likely to work to prevent the strand from dropping under undesired conditions, e.g., power stoppage.
  • large weight of the strand or a dummy bar acts on drive rollers in continuous casting equipment, particularly in vertical continuous casting equipment during a start operation using the dummy bar and during a casting operation, which consequently causes drive rollers to rotate, i.e., "reverse-powering", owing to a friction force generated on contact surfaces of the drive roller and the strand due to a falling force exerted from the strand or the dummy bar.
  • the drive motor does not sense that the drive roller is in the "reverse-powering" condition, and it becomes difficult to control the output of the drive motor based on the load sensed by the drive motor.
  • the drive motor continues to generate driving forces even for the case that outputs of the drive roller should be reduced, thereby leading to the problem that excessive loads damage the worm reducer.
  • An object of the present invention is to provide a strand guiding apparatus for continuous casting equipment which has overcome the above-mentioned problems.
  • Another object of the present invention is to provide a strand guiding apparatus for continuous casting equipment which can reliably control drive rollers so as to have a proper rotational speed without causing a reduction in the surface quality and chatter while using worm reducers capable of obtaining a large speed reduction ratio by a compact mechanism.
  • a strand guiding apparatus for continuous casting equipment comprises a pair of rollers to sandwich a strand; a drive motor for generating a driving force to drive at least one of the pair of rollers; a worm reducer for transmitting the driving force of the drive motor to the at least one of the pair of rollers while reducing the rotational speed of the drive motor, the worm reducer having a worm extending in a direction orthogonal to an axis of the at least one of the pair of rollers, and operable to transmit a load occurring at the roller to the drive motor; and a control unit for controlling the rotational speed of the roller and/or the driving force of the drive motor based on the load to the drive motor.
  • the strand guiding apparatus can control the roller at a proper rotational speed without lowering the surface quality of the strand and causing chatter, while keeping the compact arrangement.
  • FIG. 1 is a schematic diagram showing a basic construction of a strand guiding apparatus according to an embodiment of the invention
  • FIG. 2 is a schematic diagram showing a drive roller arrangement at part A marked in FIG. 1
  • FIG. 3 is an enlarged view showing a drive roller arrangement at a part B marked in FIG. 2
  • FIG. 4 is a partial front view in section of a worm reducer used in the strand guiding apparatus
  • FIG. 5 is a perspective view of multi-strand continuous casting equipment using the strand guiding apparatus
  • FIG. 6 is a graph showing a self-lock limit characteristic curve of the worm reducer
  • FIG. 7 is a graph showing a relationship between a torque input to a control unit and a command value concerning a rotational speed output from the control unit.
  • the present inventors studied the possibility of controlling the rotational speed of a drive roller somehow based on a load transmitted to a drive motor while taking advantage of a worm reducer known to ensure a large speed reduction ratio by a compact mechanism.
  • the present invention was completed based on knowledge that if the gear ratio of the worm reducer is set at a small value, self-locking does not occur and a load occurring on the drive roller is transmitted to the drive motor, and the rotational speed of the drive roller can be accurately controlled based on the load transmitted to the drive motor without causing a reduction in the surface quality and chatter.
  • FIG. 1 shows a vertical continuous casting equipment 2 in which a strand guiding apparatus 1 embodying the present invention is installed.
  • the continuous casting equipment 2 is equipment to continuously cast a strand S for blooms, billets or slabs, and includes a tundish 4 in the form of a bottomed box for temporarily storing molten steel supplied from a ladle 3, a mold 6 to which the molten steel is supplied from a submerged nozzle 5 provided at a bottom of the tundish 4, and the strand guiding apparatus 1 provided below the mold 6 along a casting direction or longitudinal direction.
  • casting is carried out by withdrawing a long strand S having a substantially rectangular cross section vertically downward from the mold 6 using the strand guiding apparatus 1.
  • the strand guiding apparatus 1 is an apparatus to guide the strand S withdrawn from the mold 6 in a moving direction or a vertical direction in FIG. 1.
  • the strand guiding apparatus 1 includes a frame 7 arranged around the strand S to surround the strand S, a plurality of guide rollers 8 (free rollers) disposed in the frame 7 for guiding the strand S while sandwiching it, and drive rollers 9 for moving the strand S in the moving direction while sandwiching it.
  • the strand guiding apparatus 1 includes drive motors 10 for generating driving forces for drivingly rotating the drive rollers 9, worm reducers 11 for transmitting the driving forces of the drive motors 10 to the drive rollers 9 while reducing the driving speed or the rotational speed of the drive motor 10, and a control unit 12 for controlling the rotational speeds of the drive rollers 9 and/or the driving forces.
  • the worm reducer changes the transmitting direction of the driving force to the axis of the drive roller 9 from the direction orthogonal to the axis of the drive roller 9.
  • Each drive roller 9 has a length longer than the width of a wider surface of the strand S, and can thus come into contact with the entire wider surface of the strand.
  • Pairs of guide rollers 8 are arranged while being spaced apart in a horizontal direction, each pair of guide rollers 8 being rotatable about axes extending in the horizontal direction of the frame 7 and being able to guide the strand S while sandwiching the strand S therebetween. Further, a plurality of pairs of guide rollers are provided on the opposite narrower surfaces of the strand at a position near the mold 6 or right below the mold 6. However, description of the guide rollers provided on the narrower surfaces is hereinafter omitted for clarification.
  • each pair is composed of a drive roller 9a and a drive roller 9b.
  • the drive roller 9a is held in contact with the surface of the strand S that is closer to the drive motor 10
  • the drive roller 9b is held in contact with the surface of the strand S that is distant from the drive motor 10.
  • the distant surface of the strand S with which the drive roller 9b is held in contact serves as a reference surface.
  • the strand S is sandwiched in the horizontal direction by these two drive rollers 9a, 9b, and conveyed in the vertical direction by them.
  • Each drive roller 9 has a shaft extending from the opposite ends thereof, and is rotatably supported on the frame 7 by supporting the shaft using an unillustrated bearing. The leading end of the shaft of the drive roller 9 penetrates through the frame 7 and projects out, and is coupled with the worm reducer 11.
  • the strand guiding apparatus 1 may be used in multi-strand continuous casting equipment capable of casting a plurality of strands.
  • a plurality of strand guiding apparatuses may be provided for the plurality of strands, respectively.
  • the worm reducer 11 is a device to transmit the driving force transmitted from the drive motor 10 via a universal joint 17 to the drive roller 9 while reducing the driving speed or the rotational speed of the drive motor 10.
  • the worm reducer 11 is provided for each of the drive roller 9b at the reference surface side and the drive roller 9a at the other surface side.
  • the worm reducer 11 includes a worm wheel 13 mounted on the shaft of each drive roller 9 and rotatable together with the drive roller 9, a worm 14 arranged in a direction orthogonal to the axis of each drive roller 9 and engaged with the worm wheel 13, and a worm shaft 15 for rotating the worm 14.
  • a coupling 16 for transmitting the driving force from the drive motor 10 to the two drive rollers 9 at the same time.
  • the driving force from the drive motor 10 is transmitted via the coupling 16 to drive both the drive roller 9b at the reference surface side and the drive roller 9a at the other surface side, in other words, the common drive is performed.
  • the diameters of the drive roller 9b at the reference surface side and the drive roller 9a at the other surface side need to be strictly managed so that the circumferential speeds of the two rollers match to each other.
  • the worm reducer 11 and the drive motor 10 for the drive roller 9a and the worm reducer 11 and the drive motor 10 for the drive roller 9b are arranged at the opposite sides of the strand S, and the respective drive rollers 9 are individually driven by the respective drive motors 10.
  • speed reduction is carried out by engagement of teeth 18 formed on the outer circumferential surface of the worm wheel 13 and an externally threaded portion 19 formed on the outer circumferential surface of the worm 14.
  • This external threaded portion 19 is formed to be at a lead angle Z to be described later to the axis of the worm shafts 15 in the sideway view of the worm 14, and a speed reduction ratio can be arbitrarily set by changing the lead angle Z of the worm 14, pitch diameter and teeth number of the worm wheel 13 or the like.
  • This lead angle Z is set such that an absolute value thereof is the same, but with positive and negative signs for the drive roller 9a at the other surface side and the drive roller 9b at the reference surface side, so that the drive roller 9a and the drive roller 9b can be rotated in the opposite rotating directions from each other.
  • the drive motors 10 are horizontally spaced apart from the drive rollers 9 in a direction perpendicular to the axes of the drive rollers 9.
  • One drive motor 10 is provided for a pair of drive rollers 9.
  • a primary speed reducer 20 including a planetary gear inside and the universal joint 17 are arranged between the drive motor 10 and the drive rollers 9.
  • the worm of the worm reducer 11 is made to have a lead angle Z which causes the driver rollers 9 to enter a non-self locking operational region.
  • the worm reducer 11 is generally set at a speed reduction ratio of 1/40 or lower, preferably, 1/20 or 1/30. This worm reducer 11 will transmit a load generated on the drive rollers 9 to the drive motor 10.
  • the worm reducer 11 is different from conventionally used worm reducers having a large speed reduction ratio of 1/40 to 1/60 or larger to prevent a strand from dropping actively using self-locking.
  • FIG. 6 is a self-locking limit characteristic curve diagram showing a relationship between the lead angle Z of the worm 14 of a certain worm reducer 11 and a friction coefficient F between the worm 14 and the worm wheel 13.
  • the lead angle Z is represented by a horizontal axis and the friction coefficient F is represented by a vertical axis.
  • a region above a self-locking limit characteristic curve L is a self-locking operational region where self-locking occurs and a region below the curve L is a non-self-locking operational region shown in gray in FIG. 6 where self-locking does not occur.
  • worm 14 and the worm wheel 13 are made of a certain material and finished by polishing their surfaces, and the friction coefficient between the worm 14 and the worm wheel 13 is 0.10 as shown in FIG. 6 with lubricant supplied between them.
  • the worm reducer 11 including the worm 14 with a lead angle Z of 3 degrees self-locking occurs since the lead angle of 3 degrees lies in the self-locking operational region.
  • the lead angle Z of the worm 14 is 6 degrees or larger, e.g., 9 degrees, it lies in the non-self-locking operational region, and self-locking does not occur.
  • the lead angle Z of the worm 14 is set in the non-self-locking operational region as described above or if the worm reducer 11 having a speed reduction ratio of 1/40 or lower is used, self-locking does not occur in the worm reducer 11 and a load generated on the drive rollers 9 is transmitted to the drive motor 10 without any trouble.
  • a load of the drive rollers 9 can be known from the load to the drive motor 10. Therefore, either one or the both of the rotational speed of the drive rollers 9 and the driving force can be controlled based on the load to the drive motor 10.
  • the strand guiding apparatus 1 further includes speed detectors 24 for detecting the rotational speeds of the drive motors 10, drive controllers 23 for controlling the outputs of the drive motors 10, and the control unit 12 for sending commands to the drive controllers 23 based on the rotational speeds of the drive motors 10 detected by the speed detectors 24.
  • speed detectors 24 for detecting the rotational speeds of the drive motors 10
  • drive controllers 23 for controlling the outputs of the drive motors 10
  • the control unit 12 for sending commands to the drive controllers 23 based on the rotational speeds of the drive motors 10 detected by the speed detectors 24.
  • the speed detector 24 is mounted on a drive shaft of the drive motor 10 to detect the rotational speed of the drive motor 10 from the rotational speed of this drive shaft.
  • the speed detector 24 includes a pulse logic generator (PLG).
  • PPG pulse logic generator
  • One speed detector 24 is mounted on each drive motor 10 to detect the rotational speed of each drive motor 10, and sends the detected rotational speed to the control unit 12.
  • the drive controller 23 is a component for controlling the output of the drive motor 10, and is provided with a current control type inverter whose output is changed by changing a current supplied to the drive motor 10.
  • the drive controller 23 includes a current controller (ACR) for controlling the current supplied to the drive motor 10 and a speed controller (ASR) for outputting a control signal corresponding to a speed to the current controller.
  • ACR current controller
  • ASR speed controller
  • One drive controller 23 is mounted on each drive motor 10 similar to the speed detector 24 to control the output of each drive motor 10.
  • the control unit 12 controls the rotational speeds of the drive rollers 9 and/or the driving forces based on loads to the drive motors 10 by a program installed therein, and includes a speed controller 22 and a load controller 21.
  • the control unit 12 is constructed by a computer or a PLC, and outputs control signals to the respective drive controllers 23 based on the rotational speeds of the drive motors 10 detected by the respective speed detectors 24, a casting speed entered beforehand, and the like.
  • the speed controller 22 is a device for rotating a reference drive roller 9c at a predetermined rotational speed so that the circumferential speed of the reference drive roller 9c out of a plurality of pairs of drive rollers 9 arranged in a vertical direction conforms to the predetermined casting speed.
  • the reference drive roller 9c is the one arranged bottommost out of the plurality of pairs of drive rollers 9 arranged in the vertical direction.
  • the casting speed of the strand S is given to the speed controller 22 beforehand, accordingly the rotational speed of the reference drive roller 9c, at which the strand S is cast at the casting speed given beforehand, can be calculated.
  • a difference between the thus calculated rotational speed of the reference drive roller 9c and the rotational speed of the drive motor 10 actually detected by the speed detector 24 is calculated in the speed controller 22. Then, the calculated difference is fed back as a speed command, and the fed-back speed command is output to a speed controller of the drive controller 23, thereby executing a control to conform the rotational speed of the drive motor 10 to the casting speed given beforehand.
  • the reference drive roller 9c may be a drive roller other than the bottommost one.
  • the reference drive roller 9c may be uppermost one or one located at an intermediate vertical position out of the plurality of drive rollers 9. Further, a construction for arbitrarily selecting any one of the plurality of drive rollers 9 as a reference drive roller 9c may be adopted.
  • the load controller 21 executes a load sharing control for detecting the loads of the respective drive motors 10 for all the drive rollers 9 other than the reference drive roller 9c and, if the detected load exceeds the predetermined load, an excess load is shared by the other drive motors 10.
  • This load sharing control is executed by setting a droop characteristic for each drive motor 10 and outputting a speed command of the rotational speed obtained by multiplying a load variation of each drive motor 10 by a droop rate to the current controller of the drive controller 23.
  • FIG. 7 shows the control based on the droop characteristic. Specifically, a torque of the drive motor 10 generated when the drive roller 9 rotates at the same speed as the rotational speed of the reference drive roller 9c is a reference torque. The command value for the rotational speed is reduced according to the droop rate if a torque (torque command) actually required by the drive motor 10 is larger than this reference torque while being increased according to the droop rate if the torque (torque command) is lower than the reference torque.
  • a torque of the reference drive roller 9c can be used for control of torque compensations to the drive rollers 9 other than the reference drive roller 9c by driving the reference drive roller 9c by a PI control and driving the drive rollers 9 other than the reference drive roller 9c by a P control.
  • a reference torque to be shared by the respective drive rollers 9 is calculated and deviations from the reference torques are used as torque compensations.
  • the reference torque may be obtained, for example, by dividing the sum total of the loads acting on all the drive rollers 9 including the reference drive roller 9c by the total number of the drive rollers 9.
  • the worm reducer 11 including the worm 14 whose lead angle Z is set in the non-self-locking operational region, or generally the worm reducer 11 set at a speed reduction ratio of 1/40 or lower can transmit the load occurring on the drive roller 9 to the drive motor 10 without causing self-locking in the worm reducer 11.
  • the outputs of the plurality of drive motors 10 can be reliably adjusted according to the loads on the drive rollers 9 while checking the loads on the drive rollers 9.
  • the rotation of the drive rollers can be controlled while the rotational speeds and torques are balanced among the plurality of drive rollers 9 by reducing the rotational speed and torque for the drive roller having a large load placed thereon and increasing the rotational speed and torque for the drive roller 9 having a small load placed thereon.
  • the plurality of drive motors 10 are either in a reverse-powering where the drive roller 9 is to rotate the drive motor 10 or in a powering state where the drive motor 10 rotates the drive roller 9, and the outputs of the drive motors 10 need to be adjusted according to their respective operation states.
  • the strand guiding apparatus which adjusts the outputs of the drive motors 10 according to the loads on the drive rollers 9 respectively, can efficiently control the outputs of the plurality of drive motors 10 according to the driving condition. Accordingly, there is no likelihood that the worm reducers 11 are damaged by excessive loads.
  • the strand guiding apparatus 1 can eliminate the problem that slippage occurs between the strand and surfaces of the drive rollers to lower the surface quality of the strand, and the problem that a force acts in a tensile direction or compression direction to cause "chatter" of the strands.
  • the strand guiding apparatus 1 remains to have the effect obtained by using the worm reducers 11, i.e., the effect of reducing the installation space and obtaining a large speed reduction rate.
  • the strand guiding apparatus 1 is particularly preferable for the multi-strand continuous casting equipment 2 which has a limited installation space.
  • the strand guiding apparatus 1 is not limited to the above embodiments and various changes and modifications are possible without changing the substance of the invention.
  • the strand guiding apparatus 1 is described in the embodiment with reference to the use in the vertical continuous casting equipment 2.
  • the strand guiding apparatus 1 may be used, for example, in vertical and bending continuous casting equipment.
  • the plurality of drive rollers 9 are arranged in the moving direction of the strand S in the strand guiding apparatus 1.
  • only one pair of drive rollers is provided to guide the strand. This construction having only one pair of driver rollers will accomplish the above-mentioned advantageous effects.
  • the drive roller 9a at the other surface side and the drive roller 9b at the reference surface side are driven by one drive motor 10.
  • a drive roller is provided either at the reference surface side of the strand S or at the other surface side, but a freely drivable roller is provided at the remaining side as far as this construction does not cause any problem with the ability to hold the strand S.
  • two drive motors may be provided at the reference surface side of strand S and at the other surface side to individually drive the pair of drive rollers.
  • the speed control is executed for the reference drive roller 9c and the load sharing control is executed for the drive rollers 9 other than the reference drive roller 9c.
  • the load sharing control may be applied for all the drive rollers 9 including the reference drive roller 9c.
  • a novel strand guiding apparatus for continuous casting equipment comprises: a pair of rollers for sandwiching a strand; a drive motor for generating a driving force to drive at least one of the pair of rollers; a worm reducer for transmitting the driving force of the drive motor to the at least one of the pair of rollers while reducing the rotational speed of the drive motor, the worm reducer having a worm extending in a direction orthogonal to an axis of the at least one of the pair of rollers, and operable to transmit a load occurring at the roller to the drive motor; and a control unit for controlling the rotational speed of the roller and/or the driving force of the drive motor based on the load to the drive motor.
  • the rotational speed of the roller can be controlled at a desired speed more reliably. Accordingly, casting can be performed without lowering the surface quality of the strand and causing chatter.
  • the strand guiding apparatus may be further provided with another drive motor for driving the other one of the pair of rollers.
  • the drive motor may drive the both of the pair of rollers, and another worm reducer transmits the driving force of the drive motor to the other roller.
  • the strand guiding apparatus may be further provided with another pairs of rollers arranged along a moving direction of the strand for sandwiching the strand; another drive motors for generating driving forces to drive the another pairs of rollers; another worm reducers for transmitting the driving forces of the another drive motors to the another pairs of rollers while reducing the rotational speed of the drive motors, each worm reducer having a worm extending in a direction orthogonal to an axis of the corresponding roller, and operable to transmit a load occurring on the roller to the corresponding drive motor.
  • the control unit controls the respective rotational speeds of the rollers and/or the respective driving forces of the drive motors based on the load to the drive motors. The provision of the plurality of pairs of rollers can guide the strand more reliably.
  • the strand guiding apparatus may be further provided with a detector for detecting loads to the drive motors.
  • the control unit judges on a detection of the detector whether a load to a specified drive motor exceeds a predetermined load, and executes a load sharing control to cause the other drive motors to share an excess load when the load to the specified drive motor is judged to exceed the predetermined load.
  • the load sharing control is executed. Accordingly, the respective plurality of the rollers can be strictly conformed to the moving speed of the strand while the loads are balanced among the plurality of rollers.
  • the strand guiding apparatus may be further provided with a reference drive roller for giving a reference moving speed to the strand; a further drive motor for generating a driving force to drive the reference drive roller; a further worm reducer for transmitting the driving force of the further drive motor to the reference drive roller while reducing the rotational speed of the further drive motor.
  • the control unit allows the reference drive roller to rotate without executing the control of the rotational speed of the roller and/or the driving force of the further drive motor. In this arrangement, the reference drive roller is provided. Accordingly, the control can be performed more reliably.
  • the worm of the worm reducer may have a lead angle which is in a non-self-locking operational region.
  • the worm reducer having such a lead angle can perform the speed reduction in a simpler construction.
  • the worm reducer may preferably be made to reduce the rotational speed of the drive motor at a speed reduction rate of 1/40 or lower. It has been known that the self-locking does not occur in the case where a normally available worm reducer is set at a speed reduction ratio of 1/40 or lower, thereby enabling the load occurring on the roller to be reliably transmitted to the drive motor. Accordingly, the use of the worm reducer having a speed reduction of 1/40 or lower can ensure the transmission of the load occurring on the roller to the drive motor without doing the cumbersome preparation of self-locking limit characteristic curve to define a relationship between a frictional state or slippery state and the lead angle of the worm.
  • the strand guiding apparatus may be installed in vertical continuous casting equipment.
  • the drive rollers are likely to enter a reverse-powering state since most of the weight of a strand or a dummy bar act on the drive rollers.
  • the respective rotational speeds of the drive rollers are controlled based on the loads transmitted from the drive rollers to the drive motors in this arrangement.
  • the reverse-powering condition of the drive roller is transmitted as a load to the drive motor. Therefore, the drive motor can be operated or controlled according to the reverse-powering state.
  • the strand guiding apparatus may be installed in multi-strand continuous casting equipment operable to continuously cast a plurality of strands.
  • the worm reducers are arranged between adjacent strands. The arrangement of the worm reducers between the adjacent strands enables the drive motors and the like for supplying the driving forces to the worm reducers to be installed at such positions as not to positionally interfere with the strands. Accordingly, a plurality of strand guiding apparatuses can be reliably installed even in multi-strand continuous casting equipment having a limited installed space.
  • the strand guiding apparatus may be further provided with a primary speed reducer between the worm reducer and the drive motor for transmitting the driving force of the drive motor to the worm reducer while reducing the rotational speed of the drive motor.
  • This arrangement in which the drive force is reduced by the primary speed reducer and further reduced by the worm reducer, enables the use of a small-sized primary speed reducer and universal joints because a large speed reduction ratio is managed by the worm reducer.

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  • Mechanical Engineering (AREA)
  • Gear Transmission (AREA)

Abstract

L'invention concerne un appareil de guidage de barres comprenant plusieurs paires de rouleaux agencées dans une direction d'avance d'une barre, plusieurs moteurs d'entraînement générant les forces d'entraînement des paires de rouleaux, plusieurs réducteurs à vis sans fin transmettant les forces d'entraînement des moteurs d'entraînement aux paires de rouleaux en réduisant la vitesse de rotation des moteurs d'entraînement, chaque réducteur à vis sans fin présentant une vis sans fin s'étendant dans une direction orthogonale à un axe du rouleau concerné et pouvant transmettre une charge présente au niveau du rouleau au moteur d'entraînement concerné, et une unité de commande qui commande les vitesses de rotation respectives des rouleaux et/ou les forces d'entraînement respectives des moteurs d'entraînement sur la base de la charge transmise aux moteurs d'entraînement. L'invention permet d'obtenir une commande fiable de l'entraînement des rouleaux pour assurer une vitesse de rotation appropriée sans provoquer une réduction de la qualité de surface et un broutage dans un appareil de guidage de barres destiné à un équipement de coulée continue utilisant des réducteurs à vis sans fin.
PCT/JP2011/003658 2011-06-27 2011-06-27 Appareil de guidage de barres pour un équipement de coulée continue Ceased WO2013001565A1 (fr)

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PCT/JP2011/003658 WO2013001565A1 (fr) 2011-06-27 2011-06-27 Appareil de guidage de barres pour un équipement de coulée continue

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PCT/JP2011/003658 WO2013001565A1 (fr) 2011-06-27 2011-06-27 Appareil de guidage de barres pour un équipement de coulée continue

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0494136U (fr) * 1990-12-26 1992-08-14
JP2001300706A (ja) * 2000-04-20 2001-10-30 Sumitomo Metal Ind Ltd 連続鋳造設備のロールセグメント
JP2008260026A (ja) * 2007-04-10 2008-10-30 Kobe Steel Ltd 連続鋳造設備における鋳片引抜装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0494136U (fr) * 1990-12-26 1992-08-14
JP2001300706A (ja) * 2000-04-20 2001-10-30 Sumitomo Metal Ind Ltd 連続鋳造設備のロールセグメント
JP2008260026A (ja) * 2007-04-10 2008-10-30 Kobe Steel Ltd 連続鋳造設備における鋳片引抜装置

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