Shot-rock diggability monitor

• US 5,844,800 A
• Filed: 12/18/1996
• Issued: 12/01/1998
• Est. Priority Date: 12/18/1996
• Status: Expired due to Term

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Brandt, Everett G., Evans, William C.
• Primary Examiner(s): Elmore, Reba I.
• Assistant Examiner(s): Garland, Steven R.
• Application Number:
  US08/769,282
• Time in Patent Office: 713 Days
• Field of Search: 364/400, 364/468.03, 364/468.01, 701/50, 702/2, 702/129, 702/174, 702/182, 702/183, 702/84, 702/81, 299/13, 299/1.05, 177/139
• US Class Current: 700/97
• CPC Class Codes: E02F 3/431 for bucket-arms, front-end loaders, dumpers or the like
• CPC Class Codes: E02F 9/2025 Particular purposes of control systems not otherwise provided for E02F3/16, E02F3/26, sub-groups of E02F3/43, E02F3/651, sub-groups of E02F3/84, E02F3/907, E02F5/145 take precedence
• CPC Class Codes: E02F 9/26 Indicating devices E02F5/145 takes precedence
• CPC Class Codes: G01G 19/10 having fluid weight-sensitive devices

Abstract

Method and Apparatus are disclosed for dynamically determining the efficiency of blast design parameters at a mine site from measured machine loader characteristics whereby a microprocessor system receives signals indicative of power train and work implement linkage measurements and develops diggability ratio indices therefrom to ascertain the blast design efficiency.

Claims

1. An apparatus for dynamically determining the efficiency of blast design parameters using muckpile condition at a mine site from measured machine loader characteristics, said loader including a drive train having an engine coupled through a torque converter and a transmission to a set of drive wheels and a digging apparatus including a bucket, comprising:

a payload sensor coupled to the digging apparatus and operative to determine a parameter indicative of a payload carried by said bucket during an operational loading cycle and produce an output signal indicative thereof;

A plurality of sensors coupled to the drive train components and to the digging apparatus and operative to measure operational parameters relating to an operational loading cycle of the loader, each sensor producing an output signal thereof; and

a microprocessor coupled to receive the payload and operational output signals and process the signals to produce diggability ratio indices indicative of the blast design parameter efficiency.

2. The apparatus of claim 1, wherein the operational loading cycle of the loader includes a DIG segment, a TRAVEL-FULL segment, a WAIT-FULL segment, a DUMP segment, a TRAVEL-EMPTY segment, and a WAIT-EMPTY segment, each segment taking a period of time to complete, the times being mutually exclusive, and coupled into the microprocessor;

and

the microprocessor operative to sum said mutually exclusive times to produce a total cycle time, and further operative to produce a Payload per Unit Cycle Time diggability ratio where;

Payload per Unit Cycle Time=Payload/Total Cycle Time

which diggability ratio is indicative of the blast design parameter efficiency.

3. The apparatus of claim 2, wherein the plurality of sensors coupled to the drive train provide signals indicative of engine speed, torque converter speed, and transmission state, and the sensors coupled to the digging apparatus provide signals indicative of tilt lever angle, tilt cylinder pressure, lift arm angle, and lift cylinder pressure.

4. The apparatus of claim 3, wherein the microprocessor is operative to calculate the machine energy expended during the DIG segment of the operational loading cycle by deriving a Drive line Energy signal, a Lift Cylinder Energy signal, and a Tilt Cylinder Energy signal and summing the derived signals in accordance with the formula:

space="preserve" listing-type="equation">DIG Energy=Drive line Energy During DIG+Lift Cylinder Energy During DIG+Tilt Cylinder Energy During DIG

the microprocessor operative to produce a Payload per Unit DIG energy diggability ratio where;

space="preserve" listing-type="equation">Payload per Unit DIG Energy=Payload/DIG Energy

which diggability ratio is indicative of the blast design parameter efficiency.

5. The apparatus of claim 3, wherein the microprocessor is operative to use the Payload and the DIG segment time to produce a Payload per Unit DIG Time diggability ratio where:

space="preserve" listing-type="equation">Payload per Unit DIG Time=Payload/DIG Time

which diggability ratio is indicative of the blast design parameter efficiency.

6. The apparatus of claim 3, wherein the microprocessor is operative to calculate an Average Lift Cylinder Pressure during DIG by summing sampled Lift Cylinder Pressure signals obtained during successive DIG segments and dividing by the number of samples thus obtained according to the formula:

space="preserve" listing-type="equation">Average Lift Cylinder Pressure during DIG=(Lift Cylinder Pressure samples)/total number of samples summed

the microprocessor further operative to use the Payload and the Average Lift Cylinder Pressure during DIG to produce a Payload per Unit Lift Cylinder Pressure during DIG diggability ratio where;

space="preserve" listing-type="equation">Payload per Unit Lift Cylinder Pressure during DIG=Payload/Average Lift Cylinder Pressure during DIG;

which diggability ratio is indicative of the blast design parameter efficiency.

7. The apparatus of claim 3, wherein the microprocessor is operative to calculate an Average Tilt Cylinder Pressure during DIG by summing sampled Tilt Cylinder Pressure signals obtained during successive DIG segments and dividing by the number of samples thus obtained according to the formula:

space="preserve" listing-type="equation">Average Tilt Cylinder Pressure during DIG=Σ

(Tilt Cylinder Pressure samples)/total number of samples summed

the microprocessor is further operative to use the Payload and the Average Tilt Cylinder Pressure during DIG to produce a Payload per Unit Tilt Cylinder Pressure during DIG diggability ratio where;

space="preserve" listing-type="equation">Payload per Unit Tilt Cylinder Pressure during DIG=Payload/Average Tilt Cylinder Pressure during DIG;

which diggability ratio is indicative of the blast design parameter efficiency.

8. The apparatus of claim 1, further including a Global Positioning System (GPS) receiver connected to the machine loader for receiving X,Y,Z coordinate information relative to the position of the machine loader with respect to the mine site;

the GPS receiver having an output signal coupled to the microprocessor for loading the coordinate information therein; and

the microprocessor operative to generate a database relating the X,Y,Z coordinate position of the machine loader to the mine site with respect to successive operational loading cycles.

9. The apparatus of claim 8, further including a display unit coupled to the microprocessor and operative to receive signals from the database and display the relative position of the machine loader with respect to the mine site for a given point in time.

10. A method for dynamically determining the efficiency of blast design parameters at a mine site from measured machine loader characteristics, said loader including a drive train having an engine coupled through a torque converter and a transmission to a set of drive wheels and a digging apparatus including a bucket, including the steps of:

sensing a parameter indicative of a payload carried by said bucket during an operational loading cycle and producing an output signal indicative thereof;

measuring operational parameters relating to an operational loading cycle of the loader and producing an output signal representative thereof; and

coupling the payload and operational output signals into a microprocessor and processing the signals to produce diggability ratio indices indicative of the blast design parameter efficiency.

11. The method of claim 10, wherein the operational loading cycle of the loader includes a DIG segment, a TRAVEL-FULL segment, a WAIT-FULL segment, a DUMP segment, a TRAVEL-EMPTY segment, and a WAIT-EMPTY segment, each segment taking a separate and distinct period of time to complete, and coupling a signal representative of each segment time into the microprocessor;

including the step of summing, in the microprocessor, said mutually exclusive times and producing a total cycle time, and further producing a Payload per Unit Cycle Time diggability ratio where;

space="preserve" listing-type="equation">Payload per Unit Cycle Time=Payload/Total Cycle Time

which diggability ratio is indicative of the blast design parameter efficiency.

12. The method of claim 11, including sensing parameters relating to engine speed, torque converter speed, and transmission state, and coupling same into the microprocessor for developing therein signals indicative of tilt lever angle, tilt cylinder pressure, lift arm angle, and lift cylinder pressure.

13. The method of claim 12, including calculating the machine energy expended during the DIG segment of the operational loading cycle by deriving a Driveline Energy signal, a Lift Cylinder Energy signal, and a Tilt Cylinder Energy signal and summing the derived signals in accordance with the formula:

space="preserve" listing-type="equation">DIG Energy=Drive line Energy During DIG+Lift Cylinder Energy During DIG+Tilt Cylinder Energy During DIG

and thereafter producing a Payload per Unit DIG energy diggability ratio where;

space="preserve" listing-type="equation">Payload per Unit DIG Energy=Payload/DIG Energy

which diggability ratio is indicative of the blast design parameter efficiency.

14. The method of claim 12, including the step of using the Payload and the DIG segment time and producing a Payload per Unit DIG Time diggability ratio where:

space="preserve" listing-type="equation">Payload per Unit DIG Time=Payload/DIG Time

which diggability ratio is indicative of the blast design parameter efficiency.

15. The method of claim 12, including the step of calculating an Average Lift Cylinder Pressure during DIG by summing sampled Lift Cylinder Pressure signals obtained during successive DIG segments and dividing by the number of samples thus obtained according to the formula:

space="preserve" listing-type="equation">Average Lift Cylinder Pressure during DIG=Σ

(Lift Cylinder Pressure samples)/total number of samples summed

thereafter using the Payload and the Average Lift Cylinder Pressure during DIG for producing a Payload per Unit Lift Cylinder Pressure during DIG diggability ratio where;

space="preserve" listing-type="equation">Payload per Unit Lift Cylinder Pressure during DIG=Payload/Average Lift Cylinder Pressure during DIG;

which diggability ratio is indicative of the blast design parameter efficiency.

16. The method of claim 12, including the step of calculating an Average Tilt Cylinder Pressure during DIG by summing sampled Tilt Cylinder Pressure signals obtained during successive DIG segments and dividing by the number of samples thus obtained according to the formula:

space="preserve" listing-type="equation">Average Tilt Cylinder Pressure during DIG=(Tilt Cylinder Pressure signals)/total number of samples summed

the microprocessor is further operative to use the Payload and the Average Tilt Cylinder Pressure during DIG to produce a Payload per Unit Tilt Cylinder Pressure during DIG diggability ratio where;

space="preserve" listing-type="equation">Payload per Unit Tilt Cylinder Pressure during DIG=Payload/Average Tilt Cylinder Pressure during DIG;

which diggability ratio is indicative of the blast design parameter efficiency.