Operating granular material conveyors near capacity

A conveyor capacity control system comprising:

• a conveyor operative to receive granular material at a conveyor intake thereof and convey received granular material to a conveyor discharge thereof with a conveying device at a conveyor flow rate up to a maximum conveyor flow rate;
• a granular material container with a container discharge opening oriented to discharge granular material from the granular material container into the conveyor intake, and a discharge gate movable to open and close the container discharge opening and control a size of the container discharge opening;
• a flow rate control processor operative to determine the maximum conveyor flow rate and detect when a discharge flow rate of granular material from the container discharge opening into the conveyor intake is greater than or less than the maximum conveyor flow rate, and operative to increase or decrease the discharge flow rate to substantially coincide with the maximum conveyor flow rate;
• wherein the flow rate control processor comprises a conveyor speed sensor operative to determine a conveyor speed of the conveying device, and wherein the maximum conveyor flow rate is determined by calibrating the conveyor to determine an optimum conveyor speed that provides the maximum conveyor flow rate and the flow rate control processor is operative to increase or decrease the discharge flow rate to maintain the conveyor speed at the optimum conveyor speed;
• wherein the conveyor is configured to convey granular material into a first bin with a first height and a second bin with a second height greater than the first height, such that the conveyor slopes upward at a first angle to discharge into the first bin and slopes upward at a second angle to discharge into the second bin, and wherein a first maximum conveyor flow rate is determined by calibrating the conveyor to determine an optimum first conveyor speed for discharging into the first bin, and a second maximum conveyor flow rate is determined by calibrating the conveyor to determine an optimum second conveyor speed for discharging into the second bin, and the flow rate control processor is operative to increase or decrease the discharge flow rate to maintain the conveyor speed at the optimum first or second conveyor speed corresponding to the conveyor discharging into the first or second bin.

A conveyor capacity control system comprising:

• a conveyor operative to receive granular material at a conveyor intake thereof and convey received granular material to a conveyor discharge thereof with a conveying device at a conveyor flow rate up to a maximum conveyor flow rate;
• a granular material container with a container discharge opening oriented to discharge granular material from the granular material container into the conveyor intake, and a discharge gate movable to open and close the container discharge opening and control a size of the container discharge opening;
• a flow rate control processor operative to determine the maximum conveyor flow rate and detect when a discharge flow rate of granular material from the container discharge opening into the conveyor intake is greater than or less than the maximum conveyor flow rate, and operative to increase or decrease the discharge flow rate to substantially coincide with the maximum conveyor flow rate;
• wherein the conveyor comprises a conveyor drive and further comprising a drive force sensor operative to sense a drive force exerted by the conveyor drive, and wherein the flow rate control processor is operative to increase or decrease the discharge flow rate to maintain the drive force at a level selected to provide the maximum conveyor flow rate.

A conveyor capacity control system comprising:

• a conveyor operative to receive granular material at a conveyor intake thereof and convey received granular material to a conveyor discharge thereof with a conveying device at a conveyor flow rate up to a maximum conveyor flow rate;
• a granular material container with a container discharge opening oriented to discharge granular material from the granular material container into the conveyor intake, and a discharge gate movable to open and close the container discharge opening and control a size of the container discharge opening;
• a flow rate control processor operative to determine the maximum conveyor flow rate and detect when a discharge flow rate of granular material from the container discharge opening into the conveyor intake is greater than or less than the maximum conveyor flow rate, and operative to increase or decrease the discharge flow rate to substantially coincide with the maximum conveyor flow rate;
• wherein the conveyor intake comprises:
• a hopper with sloping hopper walls and a flexible chute attached to the hopper walls;
• a chute top actuator operative to move a top end of the flexible chute from a lowered idle position to a raised operating position;
• wherein when the flexible chute is in the operating position, the flexible chute and hopper are configured to receive granular material from the container discharge opening and direct same to an exposed portion of the conveying device, wherein the flexible chute and hopper walls are oriented with respect to the container discharge opening such that when the container discharge opening is fully open, granular material flowing from the container discharge opening is contained in the flexible chute and the hopper and the discharge flow rate is equal to the conveyor flow rate;
• a chute bottom actuator operative to raise and lower a bottom end of the flexible chute to correspondingly increase and decrease the discharge flow rate.

A conveyor capacity control system comprising:

• a conveyor operative to receive granular material at a conveyor intake thereof and convey received granular material to a conveyor discharge thereof with a conveying device at a conveyor flow rate up to a maximum conveyor flow rate;
• a granular material container with a container discharge opening oriented to discharge granular material from the granular material container into the conveyor intake, and a discharge gate movable to open and close the container discharge opening and control a size of the container discharge opening;
• a flow rate control processor operative to determine the maximum conveyor flow rate and detect when a discharge flow rate of granular material from the container discharge opening into the conveyor intake is greater than or less than the maximum conveyor flow rate, and operative to increase or decrease the discharge flow rate to substantially coincide with the maximum conveyor flow rate;
• and
• wherein:
• the container discharge opening is in a middle bottom portion of the granular material container and oriented substantially horizontally;
• the conveyor comprises a transfer conveyor section and a main conveyor section;
• the transfer conveyor section is configured to extend under the granular material container and is operative to receive granular material from the horizontal container discharge opening at the conveyor intake;
• the conveyor intake comprises a hopper with sloping hopper walls configured to receive granular material from the container discharge opening and direct same to an exposed portion of the conveying device at an outer end of the transfer conveyor section;
• the hopper walls are oriented with respect to the container discharge opening such that when the container discharge opening is fully open, granular material flowing from the container discharge opening is contained in the hopper, and such that the discharge flow rate is equal to the conveyor flow rate;
• the main conveyor section slopes upward from an inner end of the transfer conveyor section and is operative to convey the received granular material to the conveyor discharge at the conveyor flow rate.

A conveyor capacity control system comprising:

• a conveyor operative to receive granular material at a conveyor intake thereof and convey received granular material to a conveyor discharge thereof with a conveying device at a conveyor flow rate up to a maximum conveyor flow rate;
• a granular material container with a container discharge opening oriented to discharge granular material from the granular material container into the conveyor intake, and a discharge gate movable to open and close the container discharge opening and control a size of the container discharge opening;
• a flow rate control processor operative to determine the maximum conveyor flow rate and detect when a discharge flow rate of granular material from the container discharge opening into the conveyor intake is greater than or less than the maximum conveyor flow rate, and operative to increase or decrease the discharge flow rate to substantially coincide with the maximum conveyor flow rate;
• wherein:
• the granular material container is a box mounted on a truck frame and comprising a hoist operative to pivot a front end of the box upward about a horizontal pivot axis at the rear of the truck frame so the products in the box flow out through the container discharge opening in the lower rear wall of the box;
• a gate actuator is operative to move the discharge gate and the wherein the flow rate control processor is operative to activate the gate actuator to control the size of the container discharge opening to increase or decrease the discharge flow rate;
• a granular material sensor mounted inside the box above the container discharge opening and operative to indicate to the flow rate control processor when granular material is below the granular material sensor;
• and
• the flow rate control processor is operative activate the hoist to raise the front end of the box upward to maintain granular material above the flow material sensor.

A discharge system for a granular material box mounted on a truck frame with a hoist operative to pivot a front end of the box upward about a horizontal pivot axis at the rear of the truck frame so the products in the box flow out through a box discharge opening in the lower rear wall of the box, the system comprising:

• a discharge gate movable to control the size of the discharge opening to increase or decrease a discharge flow rate of granular material from the box discharge opening;
• a granular material sensor mounted inside the box above the box discharge opening and operative to indicate to a hoist controller when granular material is below the granular material sensor;
• and
• wherein the hoist controller is operative activate the hoist to raise the front end of the box upward to maintain granular material above the flow material sensor as granular material flows out of the box through the box discharge opening.

A method of controlling a conveyor for conveying granular material, the method comprising:

• discharging granular material from a granular material container through a container discharge opening, and the granular material container comprising a discharge gate operative to control a size of the container discharge opening;
• orienting a conveyor intake of the conveyor to receive granular material from the container discharge opening and conveying received granular material to a conveyor discharge of the conveyor with a conveying device at a conveyor flow rate up to a maximum conveyor flow rate;
• determining the maximum conveyor flow rate;
• detecting when a discharge flow rate of granular material from the container discharge opening into the conveyor intake is greater than or less than the maximum conveyor flow rate, by driving the conveyor with a conveyor drive and sensing a drive force exerted by the conveyor drive, and increasing or decreasing the discharge flow rate to maintain the drive force at a level selected to provide the maximum conveyor flow rate.