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4th Year Millwright > Conveyors > Flashcards

Conveyors Flashcards

1
Q

Name 4 main components of a belt conveyor system.

A

belts, idlers, take-up devices, loading and unloading devices

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2
Q

What is the purpose of a tripper?

A

To allow the discharge of material at any point along the length of the conveyor.

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3
Q

What are the 3 main components of a typical belt in a belt conveyor?

A

top cover, carcass, bottom cover

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4
Q

What portion of the belt provides the strength and tension?

A

the carcass

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5
Q

Name 4 functions of an automatic gravity take-up on a belt conveyor.

A

maintains tension, removes slack on start-up, provides reserve belt material for splicing, allows for expansion/contraction of belt

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6
Q

What type of splice to steel cable belts require?

A

hot vulcanized splice

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7
Q

What type of mechanical splice can be used to repair damaged sections of belt?

A

bolted solid plate type

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8
Q

What type of splicing is usually the strongest, and up to what percentage of belt strength can it achieve?

A

hot vulcanizing, up to 90% of belt strength

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9
Q

What type of pulley is used to prevent material build up between the belt and pulley, and are usually used on slow-speed conveyors?

A

self-cleaning or wing pulleys

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10
Q

What type of pulley is used to increase the arc of contact on a drive pulley?

A

snub pulley

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11
Q

In a addition to increasing the arc of contact, what else can be used to increase friction between the belt and pulley?

A

lagging

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12
Q

Name the 3 main troughing angles.

A

20 deg, 35 deg, 45 deg

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13
Q

What is used in a trough conveyor to level or trough the belt before it goes over the head or tail pulley, and to prevent belt edge stretching?

A

transition idlers

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14
Q

What type of idlers are installed at the loading points to prevent belt damage?

A

impact idlers (or impact cradle)

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15
Q

What type of return idlers would be used when transporting sticky material?

A

spiral rubber disc

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16
Q

What are conditions are preferred when feeding material from the loading chute to the belt?

A

that the material is fed at the same speed and in the same direction of the belt

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17
Q

What are installed to prevent material from spilling at loading points?

A

sideboards and skirts

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18
Q

What should skirting material and V plow rubber never be made from?

A

old belting

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19
Q

What are several factors that affect belt tracking?

A

frame damage, foundation settling, off-centre loading, incorrect belt splice (not square), take-up carriage out of line, incorrect belt tension, material build-up on idlers

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20
Q

What angles may return idlers be inclined at to form a V on some long belts?

A

10 deg or 20 deg

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21
Q

Where is a V plow installed on a troughing conveyor, and what is its purpose?

A

Installed before the tail pulley to clean the carrying side of the belt.

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22
Q

Name 3 methods used to remove tramp iron from the material on a belt conveyor.

A

suspended magnet, magnetic head pulley, separate magnetic belt above discharge

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23
Q

What is the minimum clearance recommended between the skirt boards and the conveyor belt?

A

1”

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24
Q

What must you be careful not to do when setting a threaded (screw) take-up

A

take care not to over-tension the belt

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25
What is the rubber adhesive compound called that binds the plies together on a belt conveyor belt?
friction
26
What is the open mesh called used to reinforce the belt against longitudinal breaking under impact?
breaker fabric
27
With which type of belt carcass material do you not use crowned pulley?
steel cord
28
What is the splice bias angle for belts under 24"?
45 deg
29
What is the splice bias angle for belts over 24"?
60 deg
30
What can be added to a hot vulcanized splice to affect the strength of the splice?
sulphur
31
What is the normal arc of contact for a drive pulley, and what is the maximum that can be increased to? How would this be accomplished?
180 deg, to a max of 240 deg (with a snub pulley)
32
What is the standard crown on a crowned pulley?
1/8" per foot of pulley face width
33
Describe a tandem drive set-up
one motor driving two pulleys, a gear or chain drive between the two drive pulleys
34
What would be the maximum angle of tilt off vertical in the direction of belt travel on trough conveyor idlers to aid in tracking?
2 deg
35
What side of belt travel in relation to the idler rollers should side guide rollers be set?
upstream of belt travel (or on the tail pulley side of the frame)
36
What is the purpose of fixed side guides?
to protect the frame of the conveyor if the belt runs off
37
With graduated idler spacing, on what section of the belt would the rollers be installed closer together? What does this prevent?
They would be closer together on the lower tension side, preventing the belt from "climbing over" the rollers
38
What is it called when idlers are slightly skewed in the direction of travel to aid in correcting belt run off?
"knocked" idlers
39
What is used on incline conveyors to prevent rollback in the event of power failure?
a backstop (often a sprag or over-running clutch)
40
What protect the carcass of a belt?
the top and bottom covers
41
What conveyor chain is designed for "side impacts" and only bends in one direction?
rooftop (camelback) chain
42
What is the main characteristic of "Manganese" that makes is suitable for chain conveyors? What must be done if this chain is heated above 500 deg F?
abrasion resistance, it then must be reheated to 1850 deg F then quenched
43
What prevents the chain from jumping the drive sprocket of a "gravity drop" chain conveyor?
the weight of the chain
44
What feature of the "H" class chain differentiates it from the Pintle chain?
flanged wear shoes
45
Where is the thrust bearing normally located on a screw conveyor? Which direction are the axial forces in this setup relative to material flow?
discharge end of the conveyor, axial thrust is in the opposite direction of the material flow, the force would be pulling axially on the thrust bearing (operates in tension)
46
What are the 3 main parts of a bucket conveyor?
the head assembly (drive), the casing, the foot assembly (boot)
47
What are the 2 methods of loading a bucket conveyor?
fly loading, scoop loading
48
What is used to prevent spillage from entering between the belt/chain and the boot pulley?
a deflector plate
49
What rollers are used to transfer material across a moving chain to an end stop?
bottle rollers
50
What are some commonly used chain styles for chain conveyors?
combination, pintle, H class, drag, refuse, detachable, transfer
51
What are the two types of bucket elevators?
continuous, centrifugal discharge
52
What are the two types of bolted joints used on bucket elevator belts?
butt, lap
53
Why is it important to only remove a few buckets at a time on alternating sides on a bucket elevator?
otherwise the elevator will be heavier on one side and may run away
54
What are the 2 general types of roller conveyors?
gravity roller, live roller
55
What is the advantage of a high roll mounting position?
packages can be wider than the conveyor
56
What is the minimum number of wheels that should be under the smallest container on a skate wheel conveyor?
5
57
What is the minimum number of wheels that should be under the smallest container on a roller conveyor?
3
58
What do angled rolls move material against?
an alignment fence (straightedge or guidebar)
59
What two gauges can be used to check a V-belt drive system?
belt tension gauge, sheave profile gauge
60
On what type of roll conveyors would a chain drive be used?
heavy duty roll conveyors
61
Name several common overload devices that may be used on a roll conveyor to prevent drive system damage
shear pin, torque limiting clutch, ball detent overload, hydraulic relief valve limiter, spring-loaded torque arm, an electric motor overloads in the motor starter, fluid coupling fusible plug, loose belt slip, zero speed switch at tail end
62
What would a low pressure vacuum system use to supply air pressure in the transport line?
lobe or roots type blower
63
Wear does most of the wear take place in a pneumatic conveying system?
the inside of the outside radius on pipe bends
64
Which vacuum pressure system would require a blow tank?
High-pressure systems
65
What is used to ensure material can enter the air stream in a pneumatic conveyor?
a rotary feeder
66
What characteristic would a chain conveyor have to keep the chain in contact with the bed?
a slight camber

4th Year Millwright (11 decks)

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