Drive for a pilger roller system
View Patent ↗A pilger rolling mill comprising a roll stand, a flywheel on a drive shaft which is mounted rotatably about an axis of rotation, and a thrust rod having a first end and a second end, wherein the first end of the thrust rod is fixed to the flywheel at a radial spacing from the axis of rotation and wherein the second end of the thrust rod is fixed to the roll stand so that in operation of the mill a rotary movement of the flywheel is converted into a translatory movement of the roll stand, comprising a drive motor having a motor shaft, wherein the motor shaft of the drive motor and the drive shaft are connected together in such a way that a rotary movement of the motor shaft leads to a rotary movement of the drive shaft and thus the drive motor drives the flywheel. To provide a pilger rolling mill whose drive for the roll stand exhibits no or only very little wear and which in addition permits a precise displacement of the roll stand with a high degree of repetition accuracy, according to the invention it is proposed that that the drive motor is a torque motor.
1. A pilger rolling mill comprising:
a roll stand,
a flywheel on a drive shaft which is mounted rotatably about an axis of rotation,
a thrust rod having a first end and a second end, wherein the first end of the thrust rod is fixed to the flywheel at a radial spacing from the axis of rotation and wherein the second end of the thrust rod is fixed to the roll stand so that in operation of the mill a rotary movement of the flywheel is converted into a translatory movement of the roll stand, and
a drive motor having a motor shaft, wherein the motor shaft of the drive motor and the drive shaft are connected together in such a way that a rotary movement of the motor shaft leads to a rotary movement of the drive shaft and thus the drive motor drives the flywheel,
wherein the drive motor is a torque motor, and
wherein the motor shaft and the drive shaft are connected together in such a way that a full revolution of the motor shaft causes a full revolution of the drive shaft.
2. A pilger rolling mill as set forth in claim 1 wherein the motor shaft and the drive shaft are in one piece.
3. A pilger rolling mill as set forth in claim 1 wherein the drive motor is a hollow-shaft motor.
4. A pilger rolling mill as set forth in claim 1 wherein the motor shaft and the drive shaft are connected together by way of a coupling.
5. A pilger rolling mill as set forth in claim 4 wherein the coupling connects the two shafts together in force-locking relationship.
6. A pilger rolling mill as set forth in claim 4 wherein the coupling connects the two shafts together in positively locking relationship.
7. A pilger rolling mill as set forth in claim 4 wherein the motor shaft and the drive shaft are connected together by way of a bevel gear transmission.
8. A pilger rolling mill as set forth in claim 1 wherein the motor shaft has a first gear which engages in positively locking relationship into a second gear of the drive shaft so that a rotation of the motor shaft causes a rotation of the drive shaft.
9. A pilger rolling mill as set forth in claim 1 wherein the motor shaft and/or the drive shaft are so mounted that movements in a direction perpendicularly to the shaft and/or in the longitudinal direction of the shaft are damped.
10. A pilger rolling mill as set forth in claim 1 wherein the drive motor has a rotor and a stator, wherein the stator has a mounting which receives the torque exerted on the stator, and wherein the mounting has a damping element.
11. A pilger rolling mill as set forth in claim 10 wherein the drive motor has a housing, and wherein the stator is connected to the housing by way of the damping element.
12. A pilger rolling mill as set forth in claim 10 wherein the drive motor has a housing, wherein the stator is connected to the housing, and wherein the housing is connected by way of the damping element to a holding means.
13. A pilger rolling mill as set forth in claim 12 wherein the holding means includes a housing of the crank drive.
14. A pilger rolling mill as set forth in claim 10 wherein the damping element has an elastically deformable material portion.
15. A pilger rolling mill as set forth in claim 10 wherein the damping element is hydraulically or pneumatically damped.