Millwright Block 4 (harmonized) NS > Conveyors > Flashcards

Conveyors Flashcards

(85 cards)

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1
Q

What are the 3 layers a belt consists of

A
  • top cover
  • bottom cover
  • carcass
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2
Q

When working around conveyor belts what emergency feature typically needs to be installed?

A

E - Stop Pull cord

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3
Q

What is the minimum surface area that should be on your head pulley?

A

120 degrees

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4
Q

Where are chain conveyors typically used?

A

High heat
Abrasions

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5
Q

What determines the material you use on your conveyor belt? (3)

A

Friction
Environment
Cost

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6
Q

Where are idellers found on a conveyor belt?

A

Return side (bottom)

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7
Q

What is the MAX crown on a head pulley?

A

1/8” per foot

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8
Q

When tracking a belt what direction will it favour?

A

The side furthest ahead

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9
Q

Is belt dressing an adequate fix?

A

No.

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10
Q

What is the carcass’ role on a belt?

A

To carry the load

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11
Q

Where does a conveyor belt take the most wear?

A

Load point

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12
Q

What roller is typically the largest on a conveyor belt?

A

Head pulley

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13
Q

When you are tracking a belt where should you start?

A

Return side working towards the tail pulley

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14
Q

How much clearance does the skirting guard need from the belt?

A

Min 1”

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15
Q

Where is a scraper found on a conveyor belt?

A

Near the discharge (head)

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16
Q

Where is a plough found on a conveyor belt?

A

On the return side (bottom)

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17
Q

What is the purpose of a snub pulley?

A

To change the arc of the belt on the head pulley

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18
Q

What is the purpose of a bend pulley?

A

To change the direction of travel on a conveyor belt

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19
Q

What is the angle of repose?

A

How steep you can stack your material

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20
Q

What is the purpose of a feeder in terms of conveyors?

A

Ensures material is evenly loaded on a conveyor belt

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21
Q

What direction should a splice be?

A

The opposite direction of the load

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22
Q

After moving a roller on a belt how long do you need to wait until you can verify the tracking

A

1 full revolution

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23
Q

How far forward should a trough roller be tilted?

A

2 degrees

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24
Q

What angles to troughing rollers come in?

A

20 degrees
35 degrees
45 degrees

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25
What is the benefits of a transition conveyor?
Sacrificial part Ability to add load cells Corrects positioning of material
26
When would a side loading chute be added to a conveyor system?
When the unloading conveyor is at an angle to the receiving conveyor
27
What is the formula to find a belt length?
BL = {[(D1 + D2) / 2 ] x 3.14 } + (2x centre to centre)
28
What type of chute accessories allows fine material to trickle onto the belt first to cushion larger material?
Grizzlies
29
What chute accessories is designed to aid in containing dust and product?
Skirting
30
What are the 3 main types of conveyor take ups?
Vertical gravity Horizontal carriage Screw take up
31
What system does a decline conveyor require?
A braking system to prevent running away
32
What type of system would an incline conveyor require?
Brake or backstop to prevent reversing
33
Which side of a fan is high pressure?
Discharge (outlet)
34
What are troughs conveyors used for?
Bulk material
35
What are the two main types of roller conveyors?
Powered (live) Non powered (gravity)
36
How many rollers do you need supporting a load?
Minimum of 3
37
Which rollers are used on curves and bend to maintain the load?
Tapered
38
Where do you tack a bucket conveyor?
At the tail end working towards the head drive or frequently using the tail drive:
39
Where does a thrust bearing go on a screw conveyor?
Bottom of the load (Loading end)
40
Which generally has more pressure fans or blowers?
Blowers.
41
What width or below is classified as a small belt?
24 inches
42
When splicing a small belt what cut must be used?
Angled (45 degrees)
43
What type of splice would most commonly be used on a single ply belt with a thin cover?
Finger splice
44
If you have a 5ft wide belt with 10 layers how large should your splice be?
7.5ft 1.5x belt width
45
What is the most common bucket elevator chains?
Sbs S Class C
46
What are the 4 types of mechanical fasteners
Hinged plate Bolted plate Wire clips Alligator clips
47
What is the purpose of mechanical fasteners?
To be fast and easy
48
What is the purpose of conveyors with regards to materials?
To transport
49
What is installed at the loading points to prevent materials from falling off the belts?
Skirts, sideboards
50
What type of fastener would be best suited for small repairs or years in a conveyor belt
Mechanical
51
What are screw conveyors enclosed in
Troughs or tubes
52
What is the physical condition of products moved by pneumatic conveyors?
Light weight and dry
53
Which type of airflow is a pneumatic conveyor using with the product inlet located on the suction side of the fan
Vacuum
54
Where is the drive for a belt conveyor usually located near?
Head pulley
55
What is the strongest most efficient type of belt splicing?
Hot vulcanized
56
What pulley is the largest diameter pulley in a conveyor system?
Head
57
What are the idlers that carry a load and prevent a load from spilling called?
Troughing idlers
58
What pulley increases the arc of contact on a drive pulley
Snub
59
What pulleys are used to change the direction of a belt
Bend
60
In a conveyor where does the majority of the wear take place
Loading point of the belt
61
What portion of the belt carries the load and tension
Carcass
62
Where are impact idlers used on a conveyor system
Loading point on the belt
63
Why are ratchet and pawl devices used on a bucket elevator
Prevent reversing of the drive
64
Why is crowning used on a pulley
To help centre the belt
65
What is the maximum amount of crown on a crown pulley
1/8 inch per foot
66
What would too much crown on a pulley drive cause
Undue strain on the centre of the belt
67
Under ideal conditions what speed is material loaded onto a conveyor belt
At the same as the belt speed
68
What is the purpose of rubber lagging on a drive pulley
To increase friction
69
While splicing a large conveyor belt what safety device is used to keep the belt ends from separating
Belt clamps
70
Calculate the length of belt required to replace a conveyor belt with 68 inches between centres a head roller of 18 inches diameter and a tail roller with 10 inch diameter
180 inches
71
What is the purpose of grizzly bars on a conveyor loading chute
Allows finer materials to fall through and act as a cushion
72
What type of pulley is required with steel core belts
Smooth
73
What must you do when replacing a shear pin
Use a shear pin with the same strength
74
What type of pulley is used to prevent material build up between belt and the pulley
Self cleaning
75
If the conveyor belt contact angle is too small in relation to the drive pulley what will it result in
Belt slippage
76
What is the purpose of a tripper in a conveyor system
Allows the discharge of materials at any point along the length of the conveyor
77
Which layer of a heavy rubber conveyor that carries a load of rock has the thickest layer of rubber
Top layer
78
On a pneumatic conveyor what is used to regulate the amount of material to be moved?
Regulating gate
79
What is used on a roller conveyor system to assist packages in navigating turns
Tapered rollers
80
What type of take ups are on small flat belts and located in the tail pulley section of the conveyor belt
Screw take ups
81
Transition rollers are located at which point on a conveyor
Loading and discharge
82
How are conveyor belts cleaned during operation
Scrapers and brushes in continuous operation
83
What is installed on conveyors to assist materials moving up an incline
Flights
84
What metal cannot be removed by a magnetic pulley
Aluminum
85
One section of belt runs out of line at all points along the system what is the probable cause
Belt improperly spliced
Millwright Block 4 (harmonized) NS
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