Grinding apparatus with load control
AssigneeC.M.E. Blasting & Mining Equipment Ltd.
InventorsBo Thomas Sjolander, Bjorn Sjolander
Life of this patent
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Abstract
The present disclosure relates to grinding apparatus for grinding the hard metal inserts of rock drill bits, said grinding apparatus having said grinding machine equipped with a grinding cup driven by a motor to rotate about its longitudinal axis wherein the support system comprises an arm or lever system to control vertical movement of the grinding machine and means to provide grinding pressure, wherein the means to provide grinding pressure may be a linear actuator and load cell assembly pivotally connected to the arm or lever system.
Claims31
A grinding apparatus for grinding hard metal inserts of rock drill bits, said grinding apparatus having a grinding machine carried on an support system and means for holding one or more bits to be ground, said grinding machine equipped with a grinding cup driven by a motor to rotate about its longitudinal axis, wherein the support system comprises an arm or lever system to control movement of the grinding machine for alignment of the grinding machine with a hard metal insert to be ground, means to provide grinding pressure, means to monitor and control one or more operational functions of the grinding apparatus selected from the group consisting of force, grinding pressure, movement and speed of movement of the grinding machine during alignment with the hard metal insert, wherein the means to provide grinding pressure includes a linear actuator and a load cell assembly to quantify and measure the force being applied during grinding, the linear actuator and load cell assembly or other part or assembly of the grinding machine further includes means to enable the grinding machine to move slightly during grinding over an uneven surface on the hard metal insert without adjustment of the linear actuator, and a programmable control system to monitor, control and adjust grinding pressure based on input from the load cell by adjusting the speed and length of travel of said linear actuator.
A control system for grinding apparatus for grinding the hard metal inserts of rock drill bits, said grinding apparatus having a grinding machine carried on an support system journaled on a frame and means for holding one or more bits to be ground, said grinding machine equipped with a grinding cup driven by a motor to rotate the grinding cup about its longitudinal axis, wherein the support system comprises an arm or lever system to control movement of the grinding machine for alignment of the grinding machine with a hard metal insert to be ground and means that provides a feed pressure for said grinding machine during grinding, wherein the means to provide feed pressure is a first actuator connected to the arm or lever system and the support system has an upper and lower parallel arm with a first end of each arm pivotally mounted to a front side of said frame, and a second end of each arm is pivotally connected to a back side of a control box wherein the first actuator is connected to the upper arm, wherein the means for holding one or more bits to be ground has one or more apertures to hold one or more bits to be ground and includes a moveable pressure plate for each aperture wherein the shank of a bit is held between said pressure plate and the sides of one of said apertures wherein movement of said pressure plate is controlled by a second actuator, said control system comprising a programmable control system to monitor, control and adjust one or more operational parameters selected from the group consisting of feed pressure, grinding cup RPM, grinding time, movement of the moveable pressure plate and movement of the actuators.
A grinding apparatus for grinding the hard metal inserts of rock drill bits, said grinding apparatus having a grinding machine carried on an support system and means for holding one or more bits to be ground, said grinding machine equipped with a grinding cup driven by a motor to rotate about its longitudinal axis, wherein the support system comprises an arm or lever system to control movement of the grinding machine for alignment of the grinding machine with a hard metal insert to be ground, means to provide grinding pressure, means to monitor and control one or more operational functions of the grinding apparatus selected from the group consisting of force, grinding pressure, movement and speed of movement of the grinding machine during alignment with a hard metal insert, wherein the means to provide grinding pressure includes a linear actuator and means to quantify and measure the force being applied during grinding, the linear actuator or other part or assembly of the grinding machine further includes means to enable the grinding machine to move slightly during grinding over an uneven surface on the hard metal insert without adjustment of the linear actuator, and a programmable control system to monitor, control and adjust grinding pressure by adjusting the speed and length of travel of said linear actuator.
A grinding apparatus for grinding rock drill bits, said grinding apparatus having a grinding machine carried on an support system and means for holding one or more rock drill bits to be ground, said grinding machine equipped with a grinding cup driven by a motor to rotate about its longitudinal axis, wherein the support system comprises an arm or lever system to control movement of the grinding machine for alignment of the grinding machine with a rock drill bit to be ground, means to provide grinding pressure, means to monitor and control one or more operational functions of the grinding apparatus selected from the group consisting of force, grinding pressure, movement and speed of movement of the grinding machine during alignment with the rock drill bit, wherein the means to provide grinding pressure includes a linear actuator and a load cell assembly to quantify and measure the force being applied during grinding, the linear actuator and load cell assembly or other part or assembly of the grinding machine further includes means to enable the grinding machine to move slightly during grinding over an uneven surface on the rock drill bit without adjustment of the linear actuator, and a programmable control system to monitor, control and adjust grinding pressure based on input from the load cell by adjusting the speed and length of travel of said linear actuator.
Dependencies are inferred from the claim text.