US 12,303,983 B2
Control system for grinding apparatus
Bjorn Sjolander, Oakville (CA); and Bo Thomas Sjolander, Oakville (CA)
Assigned to C.M.E. BLASTING & MINING EQUIPMENT LTD., Oakville (CA)
Appl. No. 17/621,245
Filed by C.M.E. BLASTING & MINING EQUIPMENT LTD., Oakville (CA)
PCT Filed Jun. 25, 2020, PCT No. PCT/CA2020/000076
§ 371(c)(1), (2) Date Dec. 21, 2021,
PCT Pub. No. WO2020/257911, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 3048076 (CA), filed on Jun. 25, 2019.
Prior Publication US 2022/0410342 A1, Dec. 29, 2022
Int. Cl. B23B 31/117 (2006.01); B24B 3/33 (2006.01); B24B 41/04 (2006.01); B24B 51/00 (2006.01)
CPC B23B 31/1175 (2013.01) [B24B 3/33 (2013.01); B24B 41/04 (2013.01); B24B 51/00 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A grinding apparatus for grinding working tips of hard metal inserts of rock drill bits, comprising:
a grinding machine, means for holding a rock drill bit to be ground and a support system, the support system comprising an arm or lever system for providing a controlled variable feed pressure during grinding,
the grinding machine equipped with a spindle assembly having an output drive shaft having a longitudinal axis, the spindle assembly providing a controlled variable speed of rotation during grinding,
a grinding cup detachably connected to the output drive shaft for grinding the working tips of hard metal inserts of rock drill bits; and
a control system comprising:
a programmable operator control panel configured to directly or indirectly monitor and adjust at least one operational parameter wherein the operation parameter comprises feed pressure, grinding cup RPM, grinding time or coolant flow, and
a programmable control card comprising a circuit board and a central processor, and
an RFID reader connected to the control system, the RFID reader having a proximity sensor configured to detect an RFID tag on a grinding cup containing specific ID data including a size and profile of the grinding cup, the RFID reader configured to transmit the specific ID data to the control system to control the speed of rotation of the output drive shaft and the feed pressure during grinding.