Thursday, August 16, 2012
Calculating Grain Bunker Volume and Capacity
Following is an illustration that can assist you in determining how many bushels of grain will fit in a grain bunker or planned flat storage grain area. Note: All volume is in cubic feet. All capacities are in bushels.
Wednesday, August 15, 2012
Calculating Bucket Elevator Spout Length
Dry grain typically flows in a spout at an angle of 45° or more. High moisture grain, sunflowers and ground feed generally require spouts at a minimum angle of 60°. To calculate spout length, the following calculations apply:
Friday, June 22, 2012
Elevator Leg Spout Capacities
When determining the required diameter of spouting, consider the following: Material flow characteristics, moisture content, cleanliness of material (no trash), spouting angle, speed of material entering the spout, possible bottlenecks created by distributors, elbows or other devices in the system.
'*Note: The above information should be used as a guideline suggestion only. No liability is assumed for its use. All considerations mentioned above will alter spout capacity and must be allowed for. Spouting for ground feed and other fluffy materials should not be set at less than 50 degrees. Some of these materials have unusual characteristics. Spouting for almost all materials should be vented if the spout angle is 55 degrees or more.
Wednesday, June 13, 2012
Hydraulic Motor Size vs. RPM Calculation:
Some useful formulas are listed below for figuring out how to size a hydraulic motor for your auger or other grain handling equipment.
Gallons per minute of supply x 231
RPM = Cubic inches of motor displacement
Gallons per minute x 231
Motor cubic inches = RPM
RPM x cubic inches of motor displacement
GPM required = 231
PTO Shaft
A common question is, "How long can I expect my PTO shaft to last?" While there are many factors that contribute to that answer, there are a few rules of thumb that should be kept in mind.
Grease! Grease! Did I mention grease? The more often the better. The number one thing you can do to extend the life of your PTO shaft is to grease it often. Want to make sure it gets done? Hang a grease gun on the equipment with a PTO shaft.
Some information regarding how operating angle contributes to the life expectancy of a PTO shaft:
At 540 RPM and transmitting 40 HP, a category 4 PTO shaft at 22 degrees has a 12% decrease in life expectancy when the angle is changed by 3 degrees.
At 540 RPM and transmitting 24 HP, a category 3 PTO shaft at 22 degrees has a 22% decrease in life expectancy when the angle is changed by 6 degrees.
Gallons per minute of supply x 231
RPM = Cubic inches of motor displacement
Gallons per minute x 231
Motor cubic inches = RPM
RPM x cubic inches of motor displacement
GPM required = 231
PTO Shaft
A common question is, "How long can I expect my PTO shaft to last?" While there are many factors that contribute to that answer, there are a few rules of thumb that should be kept in mind.
Grease! Grease! Did I mention grease? The more often the better. The number one thing you can do to extend the life of your PTO shaft is to grease it often. Want to make sure it gets done? Hang a grease gun on the equipment with a PTO shaft.
Some information regarding how operating angle contributes to the life expectancy of a PTO shaft:
At 540 RPM and transmitting 40 HP, a category 4 PTO shaft at 22 degrees has a 12% decrease in life expectancy when the angle is changed by 3 degrees.
At 540 RPM and transmitting 24 HP, a category 3 PTO shaft at 22 degrees has a 22% decrease in life expectancy when the angle is changed by 6 degrees.
Thursday, April 5, 2012
Calculating Conveyor Angle
One could pull out their calculator and mess with sin, cos, tan, but when it comes to figuring out discharge height, or conveyor length, or angle of incline for an auger or conveyor installation, I just pull up this handy web page: http://www.csgnetwork.com/righttricalc.html
Enjoy!
Enjoy!
Thursday, March 15, 2012
Screw Conveyor Lump Size Limitations
The size of a screw conveyor not only depends on the capacity required, but also on the size and proportion of lumps in the material to be handled. The size of a lump is the maximum dimension it has. A closer definition of the lump size would be the diameter of a ring through which the lump would pass. However, if a lump has one dimension, much longer than its transverse cross-section, the long dimension or length would determine the lump size.
The character of the lump also is involved. Some materials have hard lumps that won't break up in transit through a screw conveyor. If that is the case, provision must be made to handle these lumps. Other materials may have lumps that are very hard, but degradable in transit through the screw conveyor, thus really reducing the lump size to be handled. Still other materials have lumps that are easily broken in a screw conveyor and therefore impose no limitations.
Three classes of lump sizes apply as follows:
Class I - A mixture of lumps and fines in which not more than 10% are lumps ranging from maximum size to one half of the maximum; and 90% are lumps smaller than one half of the maximum size.
Class II - A mixture of lumps and fines in which not more than 25% are lumps ranging from the maximum size to one half of the maximum; and 75% are lumps smaller than one half of the maximum size.
Class III - A mixture of lumps only in which 95% or more are lumps ranging from maximum size to one half of the maximum size; and 5% or less are lumps less than one tenth of the maximum size.
Table III shows the recommended maximum lump size for each customary screw diameter and the three lump classes. The ration, R, is included to show the average factor used for the normal screw diameters which then may be used as a guide for special screw sizes and constructions. For example:
Radial Clearance, Inches
Ratio, R = Lump Size, Inches
The allowable size of a lump in a screw conveyor is a function of the radial clearance between the outside diameter of the central pipe and the radius of the inside of the screw trough, as well as the proportion of lumps in the mix. The following illustration shows this relationship:
The character of the lump also is involved. Some materials have hard lumps that won't break up in transit through a screw conveyor. If that is the case, provision must be made to handle these lumps. Other materials may have lumps that are very hard, but degradable in transit through the screw conveyor, thus really reducing the lump size to be handled. Still other materials have lumps that are easily broken in a screw conveyor and therefore impose no limitations.
Three classes of lump sizes apply as follows:
Class I - A mixture of lumps and fines in which not more than 10% are lumps ranging from maximum size to one half of the maximum; and 90% are lumps smaller than one half of the maximum size.
Class II - A mixture of lumps and fines in which not more than 25% are lumps ranging from the maximum size to one half of the maximum; and 75% are lumps smaller than one half of the maximum size.
Class III - A mixture of lumps only in which 95% or more are lumps ranging from maximum size to one half of the maximum size; and 5% or less are lumps less than one tenth of the maximum size.
Table III shows the recommended maximum lump size for each customary screw diameter and the three lump classes. The ration, R, is included to show the average factor used for the normal screw diameters which then may be used as a guide for special screw sizes and constructions. For example:
Radial Clearance, Inches
Ratio, R = Lump Size, Inches
The allowable size of a lump in a screw conveyor is a function of the radial clearance between the outside diameter of the central pipe and the radius of the inside of the screw trough, as well as the proportion of lumps in the mix. The following illustration shows this relationship:
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