Conveving Systems Flashcards
The key components of a conveyor are the ______
Belts,idlers, pulleys, take up and tensioning device and loading and unloading systems
In belt conveyors the highest wear point is usually found at the ____
Loading point
To minimize some of the affects of this wear it is preferable to feed the material from loading chute at the _____
Same speed and in the same direction of the belt
Installation of ______ if material is abrasive
Chute liners
The purpose of these ______ is to allow the fine material to through the bars to the belt underneath just prior to the discharge point
Grizzlies
The boards should never come into contact with the _____
Belt a minimum 1-inch clearance
The skirt rubber should always be a _____ amd never substitute with _______
Soft rubber compound
Old belt material as the harder belting wears the belt
The top cover in most cases is usually ____
Thicker then the bottom cover
The top cover must resist __
Abrasion and gouging from the material being conveyed
______ Is the portion of the belt that provides strength and tension?
Carcass
There are 4 basic types of carcass
- solid woven
-reduced ply
-multiple ply
-steel cord
The solid woven belt consists of a
Single ply
Reduced ply This type of carcass either has fewer plies then a regular____ or has a special weave
Multi ply (2)
Multiple ply belts usually have at least
3 layers of woven material
The _________ type can also be used to repair section of belt that have become damaged or to repair small tears and slits
Bolted solid plate type
The _____ is the pulley that transmits the power from the power unit to the belt. It may be lagged,smooth,self cleaning or crowned
Drive pulley
______ is a rubber based compound and is normally found on drive pulley. It’s main purpose is to increase the coefficient of friction between the belt and the pulley
Lagging
____ refers to a pulley with a larger diameter at the center then at the ends
Crowned pulleys
The increase in diameter on a crowned pulley tends to keep the belt centered on the pulley. Standard crown is ____
1/8 per foot of pulley face width
The ________ pulley is always located at the discharge point and is usually the largest diameter pulley in the conveyor
Head pulley
The most common used ______ have three rollers of equal length arranged in line with each other
Troughing idlers
The advantage of this type is that it allows the belt to sit lower in the frame thereby reducing material load height ____
Offset type
Fixed side guides do not ____ they only prevent damage to the framework of the conveyor the belt or other objects caused by belt running off to one side
Correct a misaligned belt
If a belt continues to run off one method of correction is to slightly _____
Skew the idlers in the direction of belt travel
Head pulleys should never______
Be adjusted to correct belt misalignment
On inclined conveyors a _____ is required to prevent rollback in the event if power failure
Backstop
A backstop is usually a _____
Sprag or over-running clutch
_______ Are usually attached to the bottom or carrying side to increase the service life of the conveyor.
Wear strips
The 3 main classes chain conveyor designs fall into are
Parallel strand
Gravity drop drives
S drives
On a ________ the top and bottom chain strands are as close to parallel as possible and the drive is located at the head end
Parallel strand conveyors
On _______ The conveyor is on slope and the drive sprocket is above the floor level, which allows the weight of the chain to maintain contact with the drive sprocket.
Gravity drop
_______ Are used when long heavily loaded chain conveyors are required. Because this type of drive allows engagement of the maximum number of drive teeth on the sprocket.
S drive
Combination chain consists of A._________ With two cast side plates connected to each other with two steel side plates and a steel pin
Cast steel block or barrel
Each link of the_______ is a One piece casting of malleable iron with both barrel and sidebars
Pintle chain
Pintle chain is available in class____
400 and class 700
The _______ Has the same design as pintle, but it has heavier construction and flanged. Wearing shoes cast onto the bottom surface. For applications with abrasive material
H class mill chain
Available H class mill chain pitches range from ______
1.654 inches to 4.000 inches
______ are stronger and more accurately made then cast chains and come in many chain types and can also be welded
Fabricated chains
Is one of the simplest chain drives because it requires no special tools to assemble or disassemble thus chain is primarily for slow speed
Detachable chain
________ Is available in rooftop also known as comelback and the roller top design
Transfer chain
_____ is modified cast pintle chain with a raised solid top usually in the shape of a roofe
Rooftop
_______ Has raised brackets into which rollers are fitted. The rollers are parallel to the direction of the chain travel and from an almost continuous line.
Roller top chain
Flights made from _____ or channel beansre fastend to a combination chain at regular intervals along the length of the chain
Angle iron
Design is usually found, on large, diameter sprockets. It allows the sprockets to be changed without disturbing the drive arrangement or alignment.
Split hub
Another type of sprocket is the ______or _____. This sprocket has either 5 or 7th and is available with individual renewable teeth or integral cast teeth
Long link chain or star sprocket
______ consist of two or more chain strands with formed flights attached theses conveyors convey large amounts of heavy or very hot material and are found in the mining and processing industry
Apron or pan conveyors
_____ transport material up inclined or vertical planes
Bucket elevators
With belt bucket elevator the best method for joining is _______ other methods include mechanical fasteners ( for relatively light belt elevators) or bolted joints
volcanizing
_______ are made by overlapping the ends of the belt over each other for at least one belt width and then fastening them with elevator bolts. On belts with fewer then 10 plies the minimum length of belt splice is equal to the belt width
Lap joints
Most manufacturers recommend using a _______ rather then trying to hammer in the pins
Pin press
Never ____ the sidebars or ____the pins to facilitae easy Assembly, this causes permanent chain failure.
Heat or grind
One of the most common maintenance items on elevators are the
buckets
For chain elevators inspect the sprocket and traction wheel for ____
Excessive wear
Check chains for elongation by ______ and then comparing the measurement to a new chain measurement or the manufacturer chart randomly pull pins to check them for wear
measuring the length over 10 pitches
Before preforming any maintenance checks on a bucket elevator ____
Purge the elevator of all materials
_____ have the same pitch dimensions as the screw diameter and convey a wide range of materials
Standard flights
_____ used in screw feeders increases from 2/3 diameter to full diameter and provide uniform withdrawal of lumpy material
Tapered standard pitch screw flights
Which is less then standard pitch prevent flooding or overfilling of material in feeders and is also found on inclined conveyors
Short pitch
Is similar to short pitch except that the pitch is half the standard pitch length. It is found in vertical or steep inclined applications where the material conveyed is fluid
Half pitch
These couplings are also referred to as______ and are fitted into the end of the screw sections and bolted into place
gudgeon shafts
One of these bearings must b abel to accept
Axial Thrust
The axial thrust is in the _______ of material flow and the thrust bearing is normally located at the _____
opposite direction
Discharge end
The most common design is U shape through fabricated from steel. Sheeting with flanged ends for easy accurate assembly.
Screw conveyor
Because of the simple design of most screw conveyors the main maintenance area is the
Drive system
Excessive wear caused the screw to come into contact with the bottom of the trough and result in ___
Holes being worn through the trough rapidly
The 2 general types of roller conveyors are
Gravity roller conveyor
Live roller conveyor
_______Can move Material in Any horizontal Direction when they are tied down, the force of gravity on the package causes the material to turn the rolls
Gravity roller conveyor
Use cylindrical rollers that are usually supported with ball bearings. The rollers must be spaced close enough together to safely support the container of material to be handled.
Standard gravity roller conveyor
The frame that supports the rollers is also called the ___
Roll case
____ Are typically constructed of steel tubing. ball bearings are installed in each end
Gravity roller conveyor rollers
For roller conveyors, the smallest number of rollers under the smallest container at any time should be
3
For skate wheel conveyors, the smallest number of wheels under the smallest package should the conveyor is expected to handle should be ____
5
In gravity, roar conveyors, the outer race of the bearing revolves around the.______
Fixed inner race
____ Is the amount of drop per unit Length a conveyor requires in order to carry the given loads
Conveyor pitch
The ____ of a Curve is named using the direction of flow as reference.
Hand
_______ Are generally used to move objects sideways across the roll after reaching an end stop.
Spiral rolls
______ Rolls set an angle. On their roll case, (guided roll case) are used When the Packages or product must be lined up against one side
Angled rolls
_______ Are movable arms or plates used to sort packages in a Roller conveyor system
Deflectors
______ Are used to Transfer packages across side transfer chains. They can be used to sort or remove packages in a conveyor process.
Jump rolls
_____ Join the package flow on two or more conveyors into one conveyor line.
Converge conveyor section
A_____ Send packages from a single roller conveyor to 2 or more conveyors lines
Diverge conveyor section
_____ Can be vertically or horizontally pivoting And can be used to open an alley through a roller conveyor when required.
Hinged gates
_______Generally operate with air pressure ranging from 15psig to 45psig
Medium pressure conveyors
______ system operate up to 125psig
High pressure system
Deflector mounts need ____
Thrust bearings
The finished grout should be kept wet for _____ using sprays or covered with wet canvas or sacking. Cement based grout be worked on after seven days but reaches its full compressive strength after _____
24 hours
28 days
Cement based grout mixtures should not be placed in temperatures below ___ unless auxiliary heating is provided
5c
When using polymeric grout make sure to wear__________
Eye protection, rubber gloves and dust mask
Levels normally incorporate an _______
adjusting screw and locking screw
Check the level all around after tightening the anchor bolt nut to ____ of there final torque value
50%
Fixed anchor bolts should be as deep as
A depth not less then 25 D
It also features a pocket in the concrete pad that extends through to the side to enable the nut to be removed from end of the anchor bolt
Boxed anchor bolts
Drop in anchor sleeves require a
Setting tool
