Crushing roller mill protective method and system

Claim 3

A method as claimed in claim 1 wherein the measurement taken of the oil is of its temperature and the operation of the mill is stopped if the measured temperature of the oil changes during operation by a predetermined amount.

Claim 4

A method as claimed in claim 1 wherein the measurement taken of the oil is of its level in the sump and the operation of the mill is stopped if the measured level of the oil changes during operation by a predetermined amount.

Claim 5

A method as claimed in claim 1 wherein the oil temperature and the oil level in the sump are measured and the operation of the mill is stopped if either the temperature or the level of the oil changes, by predetermined amounts, during operation of the mill.

Claim 6

A method as claimed in claim 1 comprising measuring at least one of the temperature and the level of the oil in the sump of each of the rollers rolling on the grinding strip of a mill, comparing the same among the foregoing measurements for all of said rollers determining if said compared measurements of one roller differ by a predetermined amount from those of the other rollers, and stopping the operation of the mill in response thereto.

Claim 7

In a crushing roller mill of the type including a rotating horizontal plate having an annular grinding strip over which roll one or more non-orbiting crushing rollers rotatably mounted to shafts by means of bearings splash lubricated by oil contained in a sump within the crushing roller bearing housing, the improvement comprising a system for monitoring the operation of the mill to protect it against unnecessary wear or breakdown comprising temperature measuring means positioned in the sump for measuring the temperature of the oil therein, signal generating and transmitting means operatively connected to the temperature measuring means for generating and transmitting a signal related to the temperature measured, control means responsive to the temperature signal for controlling the operation of the mill.

Claim 8

In a crushing roller mill of the type including a rotating horizontal plate having an annular grinding strip over which roll one or more non-orbiting crushing rollers rotatably mounted to shafts by means of bearings splash lubricated by oil contained in a sump within the crushing roller bearing housing, the improvement comprising a system for monitoring the operation of the mill to protect it against unnecessary wear or breakdown comprising temperature measuring means positioned in the sump for measuring the temperature of the oil therein, signal generating and transmitting means operatively connected to the temperature measuring means for generating and transmitting a signal related to the temperature measured, control means responsive to the temperature signal for controlling the operation of the mill.

Claim 9

In a crushing roller mill of the type including a rotating horizontal plate having an annular grinding strip over which roll one or more non-orbiting crushing rollers rotatably mounted to shafts by means of bearings splash lubricated by oil contained in a sump within the crushing roller bearing housing, the improvement comprising a system for monitoring the operation of the mill to protect it against unnecessary wear or breakdown comprising oil level measuring means positioned in the sump for measuring the level of the oil therein, signal generating and transmitting means operatively connected to the boil level measuring means for generating and transmitting a signal related to the oil level measured, control means responsive to the oil level signal for controlling the operation of the mill.

Claim 10

In a crushing roller mill of the type including a rotating horizontal plate having an annular grinding strip over which roll one or more non-orbiting crushing rollers rotatably mounted to shafts by means of bearings splash lubricated by oil contained in a sump within the crushing roller bearing housing, the improvement comprising a system for monitoring the operation of the mill to protect it against unnecessary wear or breakdown comprising oil level measuring means positioned in the sump for measuring the level of the oil therein, signal generating and transmitting means operatively connected to the boil level measuring means for generating and transmitting a signal related to the oil level measured, control means responsive to the oil level signal for controlling the operation of the mill.

Claim 11

The improvement as claimed in claim 7 wherein the oil level measuring means comprises a capacitor means having opposite capacitor surfaces penetrating below the level of the oil in the sump between which the oil acts as a dielectric so that the capacitance varies with the level of the oil, the signal generating means comprises a telemetering means including an oscillatory circuit means the oscillation frequency of which changes with the capacitance changes brought about by an oil level change, circuit means relating the oscillation frequency to a voltage potential and the control means includes means for acting in response to the voltage potential.

Claim 12

In a crushing roller mill of the type including a rotating horizontal plate having an annular grinding strip over which roll one or more non-orbiting crushing rollers rotatably mounted to shafts by means of bearings splash lubricated by oil contained in a sump within the crushing roller bearing housing, the improvement comprising a system for monitoring the operation of the mill to protect it against unnecessary wear or breakdown comprising providing a crushing roller shaft having an axially longitudinal bore therein arranged in communication with the sump so that oil in the sump rises in the bore, a resistance-type temperature measuring feeler means positioned in the bore to penetrate beneath the surface of the oil for measuring the temperature of the oil in the bore, a metal jacket means surrounding the temperature measuring feeler means concentrically positioned within the bore and forming an annular space therebetween, the metal jacket means being electrically insulated from the bore, the metal jacket means and the bore wall forming opposite capacitor surfaces with the oil in the bore as a dielectric therebetween, circuit means connected to the temperature measuring feeler for providing an electrical signal output related to the temperature of the oil in the bore, circuit means connected to the metal jacket means and bore wall for determining the capacitance change occurring from change in the oil level in the bore and providing an electrical signal output related to the oil level, indicating means responsive to the temperature and oil level signal means for indicating when the temperature or oil level varies from a predetermined value.

Claim 13

In a crushing roller mill of the type including a rotating horizontal plate having an annular grinding strip over which roll one or more non-orbiting crushing rollers rotatably mounted to shafts by means of bearings splash lubricated by oil contained in a sump within the crushing roller bearing housing, the improvement comprising a system for monitoring the operation of the mill to protect it against unnecessary wear or breakdown comprising providing a crushing roller shaft having an axially longitudinal bore therein arranged in communication with the sump so that oil in the sump rises in the bore, a resistance-type temperature measuring feeler means positioned in the bore to penetrate beneath the surface of the oil for measuring the temperature of the oil in the bore, a metal jacket means surrounding the temperature measuring feeler means concentrically positioned within the bore and forming an annular space therebetween, the metal jacket means being electrically insulated from the bore, the metal jacket means and the bore wall forming opposite capacitor surfaces with the oil in the bore as a dielectric therebetween, circuit means connected to the temperature measuring feeler for providing an electrical signal output related to the temperature of the oil in the bore, circuit means connected to the metal jacket means and bore wall for determining the capacitance change occurring from change in the oil level in the bore and providing an electrical signal output related to the oil level, indicating means responsive to the temperature and oil level signal means for indicating when the temperature or oil level varies from a predetermined value.

Claim 14

The improvement as claimed in claim 9 wherein the mill includes means for continuously comparing the same in each roller and determining whether one differs by a predetermined amount from the other.