CA2361973A1 - Method for assessing the operation of a conveyor apparatus - Google Patents
Method for assessing the operation of a conveyor apparatus Download PDFInfo
- Publication number
- CA2361973A1 CA2361973A1 CA 2361973 CA2361973A CA2361973A1 CA 2361973 A1 CA2361973 A1 CA 2361973A1 CA 2361973 CA2361973 CA 2361973 CA 2361973 A CA2361973 A CA 2361973A CA 2361973 A1 CA2361973 A1 CA 2361973A1
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- CA
- Canada
- Prior art keywords
- motor
- measuring
- processed
- electrical
- conveyor
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G11/00—Apparatus for weighing a continuous stream of material during flow; Conveyor belt weighers
- G01G11/04—Apparatus for weighing a continuous stream of material during flow; Conveyor belt weighers having electrical weight-sensitive devices
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention is directed to an apparatus and method for measuring the weight of material such as rock, earth, wood, grain, gravel, sand, ore, cement etc.
being processed or moved by an apparatus such as a conveyor driven by an electrical motor. The apparatus comprises a means for measuring the electrical energy consumed by the motor powering the apparatus during operation of the apparatus and a calibration formula for converting the power consumption of the motor to tons per minute of raw material processed by the apparatus.
being processed or moved by an apparatus such as a conveyor driven by an electrical motor. The apparatus comprises a means for measuring the electrical energy consumed by the motor powering the apparatus during operation of the apparatus and a calibration formula for converting the power consumption of the motor to tons per minute of raw material processed by the apparatus.
Description
TITLE: Method for Assessing the Operation of a Conveyor AQparatus FIELD OF THE INVENTION
The present invention is directed to a method for measuring the weight of material, such as ore, rock, sand, gravel, earth, wood, grain, cement, etc., being processed by an apparatus such as a conveyor system by an electric motor. In particular, the method is directed to converting electrical power consumption of the electric motor powering the apparatus into weight per minute movement of raw material processed by the apparatus..
BACKGROUND OF THE INVENTION
In many mining, quarrying, sand and gravel operations it is desirable to measure the amount of raw material, such as aggregate, gravel, ore etc. being processed or moved, in order to maximize production at the operation. In the past, this has been accomplished either by weighing the amount of material loaded into transport vehicles, such as trucks or railway cars or through the use of auto weigh feeders, belt scales or load cells all based on the use of strain gauge load cells combined with high speed sensors to measure tonnage. This can be an expensive set up, requiring installation of new equipment, wiring and material testing for calibration for each piece of equipment to be monitored. To maintain accuracy the belt scales or load cells also require regular calibration and zeroing of cells.
There remains a need for a means of measuring the amount of material being processed or moved in an operation such as a quarrying or mining operation which is inexpensive, simple to operate and simple to adapt to existing operations.
TITLE: Method for Assessing the Operation of a Convenor Apparatus FIELD OF THE INVENTION
The present invention is directed to a method for measuring the weight of material, such as ore, rock, sand, gravel, earth, wood, grain, cement, etc., being processed by an apparatus such as a conveyor system by an electric motor. In particular, the method is directed to converting electrical power consumption of the electric motor powering the apparatus into weight per minute movement of raw material processed by the apparatus.
BACKGROUND OF THE INVENTION
In many mining, quarrying, sand and gravel operations it is desirable to measure the amount of raw material, such as aggregate, gravel, ore etc. being processed or moved, in order to maximize production at the operation. In the past, this has been accomplished either by weighing the amount of material loaded into transport vehicles, such as trucks or railway cars or through the use of auto weigh feeders, belt scales or load cells all based on the use of strain gauge load cells combined with high speed sensors to measure tonnage. This can be an expensive set up, requiring installation of new equipment, wiring and material testing for calibration for each piece of equipment to be monitored. To maintain accuracy the belt scales or load cells also require regular calibration and zeroing of cells.
There remains a need for a means of measuring the amount of material being processed or moved in an operation such as a quarrying or mining operation which is inexpensive, simple to operate and simple to adapt to existing operations.
SUMMARY OF THE INVENTION
The present invention is directed to an apparatus and method for measuring the weight of material such as rock, earth, wood, grain, gravel, sand, ore, cement etc.
being processed or moved by an apparatus such as a conveyor driven by an electrical motor. The apparatus comprises a means for measuring the electrical energy consumed by the motor powering the apparatus during operation of the apparatus and a calibration formula for converting the power consumption of the motor to tons per minute of raw material processed by the apparatus.
BRIEF DESCRIPTION OF THE DRAWINGS
Preferred embodiments of the present invention are shown in the attached drawings, wherein:
Figure 1 is a picture of the components making up the apparatus of the present invention;
Figure 2 is a schematic drawing showing a typical layout of the components of the invention;
Figure 3 is a graph illustrating the method used to calibrate a typical conveyor belt with the resulting regression formula to convert amperage to tonnes per minute for two typical conveyor belts;
Figure 4 is a sample of a typical daily summary report for a typical conveyor belt showing current readings and conversion to tonnes per minute; and Figure 5 is a table illustrating the correlation between the method of the present invention and actual measurement of tonnage of material processed in a typical quarry over several weeks of operation with measurements with the current invention taking place with three conveyor belts.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
A preferred embodiment of an apparatus according to the present invention is illustrated by the picture in figure 1, and the schematic drawing, figure 2.
The apparatus is used with a conveyor system which has a motor 11 which is used to drive a conveyor system 10. The motor 11 is electrically powered with the electrical power being provided by wires, item 1 connected to a suitable source of electrical energy such as the local electrical grid or a local generator. As the conveyor motor 11 operates to drive the conveyor system 10 it draws the required electrical energy from the electrical power source. The amount of electrical energy drawn by the motor 10 is related to the load placed upon the motor 10 which in turn is related to the weight of material on the conveyor system 11.
In order to measure the amount of electrical energy being drawn by the motor 10, a suitable means for measuring the power consumption of the motor is required.
Normally to get an actual measurement of power a watt measuring device would be used. However it was found that measuring the current or both the current and voltage of the electrical energy passing through the wire, item 1 provided a close correlation to watts being consumed with utility power grid installations. This means for measuring the electrical energy may be hardwired into the system by being connected in series or parallel with the motor 10 depending upon whether the current or both the current and voltage are being measured. Preferably, in order to easily adapt the apparatus of the present invention to existing mining or quarry operations the measuring device is selected so that it can be clamped or attached to the wire, item 1 and provide an indication of the current or both the current and voltage passing through the wire, item 1. One example of such a device is an AMPROBE current clamp, item 3 or a GREYSTONE Split Core Current Transducer, item 2. The output of the device, item 2 or 3 is connected to a suitable recording device such as an ACR Smart Reader Plus 3 or Plus 7 data loggers, item 4 which records and stores the electrical readings. The data from the data logger, item 4 is passed to a suitable computer, item 6 which, using suitable derived calibration formulas as described below, converts the electrical readings recorded by the data logger, item 4 into tonnage per minute of material passing over the conveyor system 10. This information may be provided on a live basis as the recordings are being measured or the data of electrical readings for a period of time of operation of the conveyor system 10 may be downloaded from the data logger, item 4 for processing by the computer, item 6 in a batch mode.
The present invention is based on the measurement of electrical energy supplied to an electrical motor driving a processing apparatus such as a conveyor system either by the utility power grid or a generator. The electrical energy supplied by the utility power grid is normally well-balanced in the three phases allowing the system of the present invention to measure the current component on one wire feeding the motor to determine the tonnage per minute for a preselected interval. The typical electrical motor operating a piece of equipment such as a conveyor system in a mine, quarry, sand and gravel or pulp and paper plant will consume a certain amount of electrical energy for a short period after start-up to initially turn over the motor. A second level of power consumption is reached to operate a piece of equipment in an idle manner with no load of material applied to the equipment. If the equipment settings are kept the same i.e. the angle of conveyor, length of conveyor, size, speed, no mud build-up etc. or in the case of a non fly-wheel assisted crusher the settings between the plates and jaws are kept constant, then once the load is applied, the additional power consumed to move or crush the material is directly proportional to the weight of the load so long as at least a minimum load of about 10 percent of the total load is applied on the equipment.
The electrical consumption of the power is measured as electrical current in amperes measured over a short interval such as about 8 seconds or less per reading and provided to the recording device such as the data logger to record and store the readings. Once several different loads have been timed accurately for a particular piece of equipment the proper formula for the factors necessary to convert power consumption in electrical current amps to tons per minute for a piece of equipment may be derived. Once this formula has been derived, any subsequent readings from the equipment may be easily converted into tonnage per minute utilizing the formula.
The system of the present invention as described above was applied to a conveyor system in a quarry operation. The current measuring device was attached to one wire of the three-phase electrical input to the motor driving a conveyor belt of the quarry system. This motor was fed by the local utility grid. The output of the current measuring device was connected to the input of a GLOWE-TECH Tonnage Analyzer data logger which measures AC
current and voltage, and temperature.
The output from the data logger was connected to a suitable computer utilizing a standard interface port such as RS 232 or USB and the measurements for tonnage per minute were calculated using a regression analysis function in a suitable computer spreadsheet. The calibration of this system is illustrated in figure 3 which is a graph of the power consumption of the motor vs. tonnage per minute of the conveyor belt system. As can be seen from figure 4, the motor in a no-load situation draws approximately 35.0 amps and as the load on the motor i.e. the amount of material applied to the conveyor system is increased, the amount of current drawn by the motor increases gradually until the load on the motor is sufficient to provide a linear relationship between power consumption and tonnage per minute on the conveyor. Typically this will be on the order of 10 percent of the rated capacity of the conveyor system and well below the normal operating parameters of the system.
From the data measurements as shown on figure 4, the regression analysis formula for this particular setup was derived. A number of test runs were then conducted in which known loads of material were placed on the conveyor system and the predicted tonnage per minute output based on the regression analysis formula compared to the actual tonnage per minute of the samples. The results of this are shown in figure 3. As clearly seen in figure 4, there is an excellent correlation between the predicted and actual tonnage per minute for this system.
If the electrical power is supplied by a generator and the power is not well balanced it may be necessary to measure both electric current in amps and voltage readings simultaneously to obtain a more accurate measurement of the power consumed to relate to tonnage per interval of time. In each case it is necessary to isolate the readings of electrical current or both current and voltage which correspond a no-load situation on the equipment to ensure that the cumulative data per period of time only includes readings when the equipment is running loaded to ensure daily power consumed as related tonnage is only applied to readings were there is an actual load on the equipment. As mentioned earlier if still more accurate measurements were required, especially with a generator supplied plant, then a watt measuring instrument could be used at a greater expense though.
While the above example is described in connection with a conveyor system in a quarry operation, the present invention is not so limited. In addition to quarry or mine operations, conveyor systems in many processing industries such as mills and processing plants for grain and other food stuffs, pulp and paper operations, sand and gravel etc. can also use the apparatus and method of the present invention.
The present invention is applicable to any operation where an apparatus or machinery is powered by an electrical motor and where it is desired to measure the tonnage output of the machinery such as a cone crusher.
The apparatus and method of the present invention provides an improved and faster method of measuring weight in tons (tonnes) of material over a device or removed by a piece of equipment at lower cost and with the capability of showing these tonnage reports locally or by telecommunications device to a remote location.
This method may be applied at several locations in an operation and will provide a new way to measure tonnage and productivity through out the operation. The method may also be applied to several locations in a multistep process to provide a new way of measuring productivity at each step through the process.
Although various preferred embodiments of the present invention have been described herein in detail, it will be appreciated by those skilled in the art, that variations may be made thereto without departing from the spirit of the invention or the scope of the appended claims.
The present invention is directed to a method for measuring the weight of material, such as ore, rock, sand, gravel, earth, wood, grain, cement, etc., being processed by an apparatus such as a conveyor system by an electric motor. In particular, the method is directed to converting electrical power consumption of the electric motor powering the apparatus into weight per minute movement of raw material processed by the apparatus..
BACKGROUND OF THE INVENTION
In many mining, quarrying, sand and gravel operations it is desirable to measure the amount of raw material, such as aggregate, gravel, ore etc. being processed or moved, in order to maximize production at the operation. In the past, this has been accomplished either by weighing the amount of material loaded into transport vehicles, such as trucks or railway cars or through the use of auto weigh feeders, belt scales or load cells all based on the use of strain gauge load cells combined with high speed sensors to measure tonnage. This can be an expensive set up, requiring installation of new equipment, wiring and material testing for calibration for each piece of equipment to be monitored. To maintain accuracy the belt scales or load cells also require regular calibration and zeroing of cells.
There remains a need for a means of measuring the amount of material being processed or moved in an operation such as a quarrying or mining operation which is inexpensive, simple to operate and simple to adapt to existing operations.
TITLE: Method for Assessing the Operation of a Convenor Apparatus FIELD OF THE INVENTION
The present invention is directed to a method for measuring the weight of material, such as ore, rock, sand, gravel, earth, wood, grain, cement, etc., being processed by an apparatus such as a conveyor system by an electric motor. In particular, the method is directed to converting electrical power consumption of the electric motor powering the apparatus into weight per minute movement of raw material processed by the apparatus.
BACKGROUND OF THE INVENTION
In many mining, quarrying, sand and gravel operations it is desirable to measure the amount of raw material, such as aggregate, gravel, ore etc. being processed or moved, in order to maximize production at the operation. In the past, this has been accomplished either by weighing the amount of material loaded into transport vehicles, such as trucks or railway cars or through the use of auto weigh feeders, belt scales or load cells all based on the use of strain gauge load cells combined with high speed sensors to measure tonnage. This can be an expensive set up, requiring installation of new equipment, wiring and material testing for calibration for each piece of equipment to be monitored. To maintain accuracy the belt scales or load cells also require regular calibration and zeroing of cells.
There remains a need for a means of measuring the amount of material being processed or moved in an operation such as a quarrying or mining operation which is inexpensive, simple to operate and simple to adapt to existing operations.
SUMMARY OF THE INVENTION
The present invention is directed to an apparatus and method for measuring the weight of material such as rock, earth, wood, grain, gravel, sand, ore, cement etc.
being processed or moved by an apparatus such as a conveyor driven by an electrical motor. The apparatus comprises a means for measuring the electrical energy consumed by the motor powering the apparatus during operation of the apparatus and a calibration formula for converting the power consumption of the motor to tons per minute of raw material processed by the apparatus.
BRIEF DESCRIPTION OF THE DRAWINGS
Preferred embodiments of the present invention are shown in the attached drawings, wherein:
Figure 1 is a picture of the components making up the apparatus of the present invention;
Figure 2 is a schematic drawing showing a typical layout of the components of the invention;
Figure 3 is a graph illustrating the method used to calibrate a typical conveyor belt with the resulting regression formula to convert amperage to tonnes per minute for two typical conveyor belts;
Figure 4 is a sample of a typical daily summary report for a typical conveyor belt showing current readings and conversion to tonnes per minute; and Figure 5 is a table illustrating the correlation between the method of the present invention and actual measurement of tonnage of material processed in a typical quarry over several weeks of operation with measurements with the current invention taking place with three conveyor belts.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
A preferred embodiment of an apparatus according to the present invention is illustrated by the picture in figure 1, and the schematic drawing, figure 2.
The apparatus is used with a conveyor system which has a motor 11 which is used to drive a conveyor system 10. The motor 11 is electrically powered with the electrical power being provided by wires, item 1 connected to a suitable source of electrical energy such as the local electrical grid or a local generator. As the conveyor motor 11 operates to drive the conveyor system 10 it draws the required electrical energy from the electrical power source. The amount of electrical energy drawn by the motor 10 is related to the load placed upon the motor 10 which in turn is related to the weight of material on the conveyor system 11.
In order to measure the amount of electrical energy being drawn by the motor 10, a suitable means for measuring the power consumption of the motor is required.
Normally to get an actual measurement of power a watt measuring device would be used. However it was found that measuring the current or both the current and voltage of the electrical energy passing through the wire, item 1 provided a close correlation to watts being consumed with utility power grid installations. This means for measuring the electrical energy may be hardwired into the system by being connected in series or parallel with the motor 10 depending upon whether the current or both the current and voltage are being measured. Preferably, in order to easily adapt the apparatus of the present invention to existing mining or quarry operations the measuring device is selected so that it can be clamped or attached to the wire, item 1 and provide an indication of the current or both the current and voltage passing through the wire, item 1. One example of such a device is an AMPROBE current clamp, item 3 or a GREYSTONE Split Core Current Transducer, item 2. The output of the device, item 2 or 3 is connected to a suitable recording device such as an ACR Smart Reader Plus 3 or Plus 7 data loggers, item 4 which records and stores the electrical readings. The data from the data logger, item 4 is passed to a suitable computer, item 6 which, using suitable derived calibration formulas as described below, converts the electrical readings recorded by the data logger, item 4 into tonnage per minute of material passing over the conveyor system 10. This information may be provided on a live basis as the recordings are being measured or the data of electrical readings for a period of time of operation of the conveyor system 10 may be downloaded from the data logger, item 4 for processing by the computer, item 6 in a batch mode.
The present invention is based on the measurement of electrical energy supplied to an electrical motor driving a processing apparatus such as a conveyor system either by the utility power grid or a generator. The electrical energy supplied by the utility power grid is normally well-balanced in the three phases allowing the system of the present invention to measure the current component on one wire feeding the motor to determine the tonnage per minute for a preselected interval. The typical electrical motor operating a piece of equipment such as a conveyor system in a mine, quarry, sand and gravel or pulp and paper plant will consume a certain amount of electrical energy for a short period after start-up to initially turn over the motor. A second level of power consumption is reached to operate a piece of equipment in an idle manner with no load of material applied to the equipment. If the equipment settings are kept the same i.e. the angle of conveyor, length of conveyor, size, speed, no mud build-up etc. or in the case of a non fly-wheel assisted crusher the settings between the plates and jaws are kept constant, then once the load is applied, the additional power consumed to move or crush the material is directly proportional to the weight of the load so long as at least a minimum load of about 10 percent of the total load is applied on the equipment.
The electrical consumption of the power is measured as electrical current in amperes measured over a short interval such as about 8 seconds or less per reading and provided to the recording device such as the data logger to record and store the readings. Once several different loads have been timed accurately for a particular piece of equipment the proper formula for the factors necessary to convert power consumption in electrical current amps to tons per minute for a piece of equipment may be derived. Once this formula has been derived, any subsequent readings from the equipment may be easily converted into tonnage per minute utilizing the formula.
The system of the present invention as described above was applied to a conveyor system in a quarry operation. The current measuring device was attached to one wire of the three-phase electrical input to the motor driving a conveyor belt of the quarry system. This motor was fed by the local utility grid. The output of the current measuring device was connected to the input of a GLOWE-TECH Tonnage Analyzer data logger which measures AC
current and voltage, and temperature.
The output from the data logger was connected to a suitable computer utilizing a standard interface port such as RS 232 or USB and the measurements for tonnage per minute were calculated using a regression analysis function in a suitable computer spreadsheet. The calibration of this system is illustrated in figure 3 which is a graph of the power consumption of the motor vs. tonnage per minute of the conveyor belt system. As can be seen from figure 4, the motor in a no-load situation draws approximately 35.0 amps and as the load on the motor i.e. the amount of material applied to the conveyor system is increased, the amount of current drawn by the motor increases gradually until the load on the motor is sufficient to provide a linear relationship between power consumption and tonnage per minute on the conveyor. Typically this will be on the order of 10 percent of the rated capacity of the conveyor system and well below the normal operating parameters of the system.
From the data measurements as shown on figure 4, the regression analysis formula for this particular setup was derived. A number of test runs were then conducted in which known loads of material were placed on the conveyor system and the predicted tonnage per minute output based on the regression analysis formula compared to the actual tonnage per minute of the samples. The results of this are shown in figure 3. As clearly seen in figure 4, there is an excellent correlation between the predicted and actual tonnage per minute for this system.
If the electrical power is supplied by a generator and the power is not well balanced it may be necessary to measure both electric current in amps and voltage readings simultaneously to obtain a more accurate measurement of the power consumed to relate to tonnage per interval of time. In each case it is necessary to isolate the readings of electrical current or both current and voltage which correspond a no-load situation on the equipment to ensure that the cumulative data per period of time only includes readings when the equipment is running loaded to ensure daily power consumed as related tonnage is only applied to readings were there is an actual load on the equipment. As mentioned earlier if still more accurate measurements were required, especially with a generator supplied plant, then a watt measuring instrument could be used at a greater expense though.
While the above example is described in connection with a conveyor system in a quarry operation, the present invention is not so limited. In addition to quarry or mine operations, conveyor systems in many processing industries such as mills and processing plants for grain and other food stuffs, pulp and paper operations, sand and gravel etc. can also use the apparatus and method of the present invention.
The present invention is applicable to any operation where an apparatus or machinery is powered by an electrical motor and where it is desired to measure the tonnage output of the machinery such as a cone crusher.
The apparatus and method of the present invention provides an improved and faster method of measuring weight in tons (tonnes) of material over a device or removed by a piece of equipment at lower cost and with the capability of showing these tonnage reports locally or by telecommunications device to a remote location.
This method may be applied at several locations in an operation and will provide a new way to measure tonnage and productivity through out the operation. The method may also be applied to several locations in a multistep process to provide a new way of measuring productivity at each step through the process.
Although various preferred embodiments of the present invention have been described herein in detail, it will be appreciated by those skilled in the art, that variations may be made thereto without departing from the spirit of the invention or the scope of the appended claims.
Claims (4)
1. An apparatus for measuring the weight of material being processed or moved by a material moving apparatus driven by an electrical motor, the apparatus comprising a means for measuring the electrical energy consumed by the motor driving the material moving apparatus during operation of the material moving apparatus and a calibration formula for converting the power consumption of the motor to tonnage per hour of raw material being processed by the apparatus.
2. An apparatus according to claim 1 wherein the material moving apparatus is a conveyor.
3. A method for measuring the weight of material being processed or moved by a material moving apparatus driven by an electrical motor, the method comprising measuring the electrical energy consumed by the motor driving the material moving apparatus during operation of the apparatus and utilizing a calibration formula to convert the amount of electrical energy consumed by the motor to tonnage per hour of raw material processed by the material moving apparatus.
4. A method according to claim 3 wherein the material moving apparatus is a conveyor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2361973 CA2361973A1 (en) | 2001-11-14 | 2001-11-14 | Method for assessing the operation of a conveyor apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2361973 CA2361973A1 (en) | 2001-11-14 | 2001-11-14 | Method for assessing the operation of a conveyor apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2361973A1 true CA2361973A1 (en) | 2003-05-14 |
Family
ID=4170492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2361973 Abandoned CA2361973A1 (en) | 2001-11-14 | 2001-11-14 | Method for assessing the operation of a conveyor apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2361973A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102589668A (en) * | 2012-03-05 | 2012-07-18 | 深圳市测力佳控制技术有限公司 | System and method by utilizing power consumption of motor to measure mass of heavy objects hoisted by motor |
| US8757363B2 (en) | 2011-05-09 | 2014-06-24 | Insight Automation, Inc. | Conveyor controllers |
| US10024708B2 (en) | 2015-05-22 | 2018-07-17 | Caterpillar Paving Products Inc. | Cold planer yield measurement system |
-
2001
- 2001-11-14 CA CA 2361973 patent/CA2361973A1/en not_active Abandoned
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8757363B2 (en) | 2011-05-09 | 2014-06-24 | Insight Automation, Inc. | Conveyor controllers |
| US9555977B2 (en) | 2011-05-09 | 2017-01-31 | Insight Automation, Inc. | Conveyor controllers |
| US10233028B2 (en) | 2011-05-09 | 2019-03-19 | Insight Automation Inc. | Conveyor controllers |
| US10654659B2 (en) | 2011-05-09 | 2020-05-19 | Insight Automation, Inc. | Conveyor controllers |
| US11247846B2 (en) | 2011-05-09 | 2022-02-15 | Insight Automation, Inc. | Conveyor controllers |
| US11724888B2 (en) | 2011-05-09 | 2023-08-15 | Insight Automation, Inc. | Conveyor controllers |
| CN102589668A (en) * | 2012-03-05 | 2012-07-18 | 深圳市测力佳控制技术有限公司 | System and method by utilizing power consumption of motor to measure mass of heavy objects hoisted by motor |
| CN102589668B (en) * | 2012-03-05 | 2014-06-25 | 深圳市测力佳控制技术有限公司 | System and method by utilizing power consumption of motor to measure mass of heavy objects hoisted by motor |
| US10024708B2 (en) | 2015-05-22 | 2018-07-17 | Caterpillar Paving Products Inc. | Cold planer yield measurement system |
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| FZDE | Dead |