Stand change carriage comprising a hydraulic motor

Abstract

The invention relates to a stand change carriage (10) for simultaneously receiving and transporting a plurality of stands of a rolling mill for rolling metal rods, wires or pipes, the stand change carriage (10) comprising a plurality of stand places (16), one of the stands being receivable individually in each of the stand places (16), the stand change carriage (10) comprising a plurality of steerable wheels (20), in order to transport the stands on rails or along a rail-less mill floor, and the stand change carriage comprising at least one hydraulic motor (21) which is operatively connected to at least one of the wheels (20) in order to drive it.

1 . A stand change carriage for simultaneously receiving and transporting a plurality of stands of a rolling mill for rolling metal rods, wires, or pipes, the stand change carriage comprising:
 a plurality of stand places, wherein one of the stands is receivable individually in each of the stand places;   a plurality of steerable wheels for transporting the stands on rails or along a rail-less mill floor, and   at least one hydraulic motor operatively connected to at least one of the wheels such that the hydraulic motor drives the stand change carriage.   
     
     
         2 . The stand change carriage according to  claim 1 ,
 wherein the hydraulic motor is a radial piston motor or an axial piston motor.   
     
     
         3 . The stand change carriage according to  claim 1 ,
 wherein each of the wheels is operatively connected to a respective hydraulic motor of the at least one hydraulic motor.   
     
     
         4 . The stand change carriage according to  claim 1 ,
 wherein at least two of the wheels are steerable, such that the at least two of the wheels are able to perform a change in direction of travel of at least 30°.   
     
     
         5 . The stand change carriage according to  claim 1 , wherein contact surfaces of the stand places have an installation height of 50 cm or less above the mill floor. 
     
     
         6 . The stand change carriage according to  claim 1 , further comprising:
 a steering drive configured to steer at least two wheels,   wherein the steering drive comprises a chain drive.   
     
     
         7 . The stand change carriage according to  claim 6 ,
 wherein the at least one hydraulic motor and an associated wheel form a drive unit which is pivotable about a steering axis and on which a ring gear is non-rotatably mounted.   
     
     
         8 . The stand change carriage according to  claim 1 ,
 wherein at least one of the stand places is arranged between at least two of the wheels during operation of the stand change carriage when viewed from above.   
     
     
         9 . The stand change carriage according to  claim 1 , further comprising
 an energy source configured to supply the at least one hydraulic motor with energy.   
     
     
         10 . The stand change carriage according to  claim 1 ,
 wherein the at least one hydraulic motor is part of a closed hydraulic circuit comprising a pump, and   wherein the hydraulic circuit is configured to not include tank.   
     
     
         11 . The stand change carriage according to  claim 1 ,
 wherein a battery-operated electric motor is mounted on the stand change carriage and is configured to supply the at least one hydraulic motor with hydraulic pressure, such that the hydraulic pressure drive the battery-operated electric motor.   
     
     
         12 . The stand change carriage according to  claim 1 , further comprising an inductive charging mechanism. 
     
     
         13 . The stand change carriage according to  claim 1 , further comprising a wireless data gearbox device for controlling the stand change carriage. 
     
     
         14 . The stand change carriage according to  claim 1 ,
 wherein the stand change carriage comprises at least four stand places.   
     
     
         15 . The stand change carriage according to  claim 1 ,
 wherein the stand places are configured to receive a stand having a hexagonal outside shape when viewed along a rolling direction of the stand.   
     
     
         16 . The stand change carriage according to  claim 1 , wherein all of the wheels are steerable, such that all of the wheels are able to perform a change in direction of travel of at least 30°. 
     
     
         17 . The stand change carriage according to  claim 4 , wherein the at least two of the wheels are able to perform a change in direction of travel of at least 90°. 
     
     
         18 . The stand change carriage according to  claim 1 , wherein contact surfaces of the stand places have an installation height of 40 cm or less above the mill floor. 
     
     
         19 . The stand change carriage according to  claim 6 , wherein the steering drive is configured to steer all of the wheels. 
     
     
         20 . The stand change carriage according to  claim 13 , wherein the data gearbox device is configured to transmit operating states of the stand change carriage.