Upgrade to remove ads
Material Handling Exam 2
Terms in this set (46)
What early scientist is credited with designing the first screw conveyor?
When using a screw conveyor to move whole grains, the loading factor is normally:
When using a screw conveyor to move heavy minerals, the loading factor is normally:
When using a screw conveyor as a "volumetric" screw feeder, the loading factor is normally
Why are most screw feeders designed with variable pitch starting at a low pitch (i.e.. 1/4 pitch, followed by a 1/2 pitch, then 3/4 pitch) and going to a larger pitch?
All of this is to level out the withdrawal from the bin so it comes in at different points in the screw conveyor (filling the different pitches)
The drive system for a screw conveyor is normally located on which end of the conveyor?
Can be at either end of the conveyor
What is the purpose of the "shroud" located at the exit of a screw feeder?
This is to regulate a consistent and constant flow
The distance from flight to flight for a 2/3 pitch screw conveyor that is 12" in diameter is:
The capacity of a screw conveyor that is used to convey material vertically: (% loading, capacity compared to a similar horizontal screw conveyor)
Is significantly less than from horizontal orientation
A "flexible" screw conveyor (unusual characteristic):
1. Can be used where a curved conveyor is needed
2. Has no center shaft
3. Can be used in the horizontal or inclined orientation
How fast (RMPs) must a given screw conveyor turn given the following?
- Deliver rate is 20 CFH/RPM
- 10,000 lbs/hr target rate
- Product density is 20 lbs/cubic foot
Normally, the maximum RPMs for a screw conveyor to turn is:
Round bottom drag conveyors are most desirable because:
They provide the best "clean out" compared with other designs
In a typical drag conveyor, internal "idler" sprockets are used to:
Keep the return portion of the chain away from the delivery portion of the chain
The "tail" section of a round-bottom drag conveyor is:
Contoured to facilitate clean out
The typical chain speed range for a drag conveyor is:
The primary advantage of a SWR drag conveyor is:
There is no need for return idlers or sidewall guides
What does "SWR" stand for?
Side Wall return
The drive for any drag conveyor is located on which end? Why?
Always on the discharge end because you want to pull the chain towards the drive
The ingredient must be metered into a drag conveyor if (inlet design):
A direct flow inlet is used
What is the purpose of a "by-pass" inlet in a drag conveyor?
A by-pass inlet is used typically on round bottom drags and takes the pressure off the return drag and puts it directly in the drag (bottom) that is carrying it straight to its destination
An "en-masse" drag conveyor typically has a much greater capacity than a normal drag conveyor. Explain what an en-masse conveyor is and why it has a greater capacity.
En-masse drag conveyors are designed to carry a maximum volume of material within the available trough structure
They are flat bottom drag conveyors where contact with other material helps push it down the conveyor
What are the recommended spout angles for Dry Grains?
Dry grains - 40 degrees
What are the recommended spout angles for Wet grains?
Wet grains - 45 degrees
What are the recommended spout angles for free flowing ingredients?
1. Free flowing - 50 degrees
2. Difficult flowing - 60 degrees
Under what circumstance would you install a spout liner in spouting?
To provide a longer wearing surface for the spouting - typically seen in square spouting or piping
What is a "cushion box" as it relates to spouting? Where would a cushion box be located in the flow?
It is on the inside of self cleaning diverters and it is where the grain bounces off the diverter
In typical square slide gate, what is the system used to support the slide itself and what is the purpose of the system beyond supporting the slides?
motor/electric actuator - its purpose is to open and close the gate
What units are used to describe the "average flow rates" through gates? Please note that on slide 12, less 10 it is pointed out that the same rate is used for either spouting or gate net area
CFH/in2 - cubic feet per hour per square inch
Whole grains are allowed a _____% greater flow rate than soft ingredients such as ground grains and meals. Why would this be the case?
25% - because they take up less space vs. ingredients that are ground and soft
Make sure that you understand the process for determining the required spout or gate size for a given problem. See problem examples on slides 13-17, lesson 10
See notebook paper
Interior hanger bearings:
1. Provide support for the conveyor shaft
2. Maintain alignment for the shaft
3. Serve as a bearing surface
The most efficient device used to transport material vertically is a:
Ground ingredients should be fed into an elevator leg on:
The "down" side of the belt
Whole grains should be fed into an elevator leg on:
The "up" side of the belt
The drive for a bucket elevator is always placed:
On the head shaft
The belt tensioning mechanism is always located on the:
A motion detector (RPM meter) is a safety device that is attached to the:
Brass friction blocks, placed on either side of the belt, are used to monitor:
Lagging is attached to the head pulley to:
Increase friction between the belt and the pulley
When calculating the capacity of a bucket elevator, which of the following are used?
1. Belt speed in ft/min
2. Cups capacity in lbs.
3. Cups per foot of belt
The most common type of discharge of the product from the buckets is:
Centrifugal discharge or gravitational discharge
For a centrifugal discharge elevator leg, the typical belt speed will be:
When elevating a light, poor flowing product such as wheat bran, a ______ bucket design is preferred
Elevator belts used to convey grain and/or grain products must be electrical conducting. Why?
Because there is an electrical current powering the conveyor most times so if there ever was a short you reduce the risk of explosion since the material you are generally conveying create highly explosive dust
What are the minimum spouting angles for feed?
1. Mash types - 50 degrees
2. Pellets - 45 degrees
YOU MIGHT ALSO LIKE...
General Crane Operation: Core test
Area Weapon System
NH Commercial Boating License Test
OTHER SETS BY THIS CREATOR
ASI 106 - Dairy Exam
Cow/Calf Health Systems - Exam 1
Companion Animal - Exam 1
Repro 400 Old Exams
OTHER QUIZLET SETS
AU60 Objective 7
Sys Analysis Chapter 7 Quiz
term 1 terms and definitions-MAIA: Biology