Dual-spindle circular saw for sawing wood
View Patent ↗A dual-spindle circular saw ( 1 ) for sawing wood ( 2 ) with two saw groups ( 3 ) is proposed, wherein each saw group ( 3 ) comprises a drive ( 7 ) having an armature ( 5 ) and a stator ( 6 ) for rotary driving of a saw spindle ( 9 ) which is mounted in a housing ( 8 ) and which is connected in a rotationally fixed manner to at least one saw tool ( 11 ) comprising at least one exchangeable circular saw blade ( 10 ), and wherein the center distance (A) of the saw spindles ( 9 ) is adjustable by an actuator. In order to create particularly advantageous design conditions, it is proposed that the armature ( 5 ) is arranged in a rotationally fixed manner on the saw spindle ( 9 ) and the stator ( 6 ) is arranged in a rotationally fixed manner in the housing ( 8 ) between a fixed bearing ( 13 ) and a floating bearing ( 14 ) of the saw spindle ( 9 ), wherein the saw tool ( 11 ) is floatingly mounted on the saw spindle ( 9 ).
1. A dual-spindle circular saw for sawing wood, said saw comprising:
two saw groups, wherein each saw group has a drive having an armature and a stator providing rotary driving of a saw spindle that is mounted in a housing and that is connected in a rotationally fixed manner to a saw tool, and
wherein an actuator provides adjustment of a center distance of the saw spindles,
wherein the armature is rotationally fixed on the saw spindle and the stator is rotationally fixed in the housing between a fixed bearing and a floating bearing of the saw spindle, and
wherein the saw tool is cantileveredly mounted on the saw spindle;
wherein the saw tool comprises exchangeable circular saw blades in a circular saw blade group interchangeably supported on a tool clamp;
wherein the tool clamp is detachably fastened via a quick-change cone to the saw spindle, which has a corresponding counterpart in the form of a conical axle stub; and
wherein the tool clamp is secured with a screw connection that extends coaxially with an axis of the saw spindle, and
wherein the screw connection includes a head actuating the screw connection, and the head of the screw connection is mounted in the tool clamp so as to be freely rotatable but axially secured therein such that said head is configured so that a portion of the head engages a portion of the tool clamp and the head is a pull-off tool pulling the tool clamp off the axle stub when the screw connection is loosened.
2. A dual-spindle circular saw according to claim 1 , wherein the armature or the stator of the drive, or both, are liquid-cooled.
3. A dual-spindle circular saw according to claim 2 , wherein the liquid cooling is provided by a liquid cooling system that is equipped with a temperature control preventing undershooting of a dew point in the housing.
4. A dual-spindle circular saw according to claim 1 , wherein the armature, the stator, the fixed bearing, and the floating bearing are liquid-cooled.
5. A dual-spindle circular saw according to claim 1 , wherein the saw spindle is liquid-cooled by a rotary union operatively associated with an end of the saw spindle facing away from the saw tool, a sleeve being connected to the rotary union is inserted into a bore coaxial with an axis of the saw spindle, such that a flow channel is formed between the bore wall and sleeve.
6. A dual-spindle circular saw according to claim 5 , wherein the flow channel extends helically around an axis of the saw spindle.
7. A dual-spindle circular saw according to claim 5 , wherein the sleeve is inserted into the bore in an axial direction through the floating bearing, the armature, and the fixed bearing.
8. A dual-spindle circular saw according to claim 1 , wherein the stator is inserted into the housing so as to form a flow channel providing liquid cooling of the stator between the stator and the housing, or the housing enclosing the stator has a flow channel providing liquid cooling of the stator.
9. A dual-spindle circular saw according to claim 8 , wherein the housing includes a jacket tube extending around an outer circumference of the housing, and wherein the flow channel providing liquid cooling of the stator is formed between the jacket tube and the stator.
10. A dual-spindle circular saw according to claim 8 , wherein the housing is provided with a jacket tube around an outer circumference thereof, and wherein the flow channel providing liquid cooling of the stator is formed between the jacket tube and the housing.
11. A dual-spindle circular saw according to claim 8 , wherein the flow channel extends helically around an axis of the saw spindle.
12. A dual-spindle circular saw according to claim 1 , wherein the floating bearings or the fixed bearings are inserted into a bushing supported rotationally fixed in the housing in a bearing block, wherein a flow channel providing liquid cooling of the bearings is formed between the bushing and the bearing block.
13. A dual-spindle circular saw according to claim 1 , wherein the floating bearing and the fixed bearing each comprise at least one rolling bearing connected via fluid lines to an oil-air lubrication device.
14. A dual-spindle circular saw according to claim 1 , wherein the stator has coils that are formed of shaped wire.
15. A dual-spindle circular saw according to claim 1 , wherein the stator has coils with pole ends, and the pole ends of the coils of the stator are guided out of the housing on an end face side or a floating bearing side in an axial direction parallel to an axis of the saw spindle.
16. A dual-spindle circular saw according to claim 1 , wherein a screw connection coaxial with an axis of the saw spindle secures the tool clamp in a mounting position.
17. A dual-spindle circular saw according to claim 1 , wherein the floating bearing and the fixed bearing each comprise at least one rolling bearing connected via fluid lines to a central oil-air lubrication device.