Conveyors

Question 1

What device is used to confine material to a belt conveyor

Answer 1

Skirts and skirt boarding

Question 2

Why are idler rollers shimmed slightly in the direction of travel

Answer 2

This provides a slight training effect on the belt

Question 3

If a belt conveying system is running out in all parts of the system what is a probable cause

Answer 3

The probable cause is improperly spliced belt

Question 4

An idler roller that is used to shape the belt at any angle from the horizontal are called

Answer 4

They are called transition idlers

Question 5

What is the minimum belt splice for elevator belts with 10 plies or less?

Answer 5

It must be at least the width of the belt

Question 6

Chain conveyors need ___________ to maintain contact with the bed and the chain?

Answer 6

It must contain CAMBER

Question 7

A cyclone is installed on pneumatic conveyors to do what?

Answer 7

It is used to seperate solid material from the air

Question 8

What is a major advantage of steel chain conveyors?

Answer 8

They can have attachments welded to them

Question 9

Which chain construction is the strongest for conveying?

Answer 9

H-Class Chain

Question 10

What is used to remove metal from a conveyor system?

Answer 10

Magnetic pulley is used

Question 11

What are the 3 major sections of a belt?

Answer 11

Top cover, bottom cover, and the carcass

Question 12

What type of belt is used in extreme tension?

Answer 12

Steel cord belt is used when extreme operating tension is constant

Question 13

What is the strongest type of splice that is used with belts?

Answer 13

Hot vulcanized is the strongest and most preferred type of splice

Question 14

What is the purpose of a crowned pulley?

Answer 14

A crowned pulley is designed with the diameter of the center of the pulley being larger than the rim forcing the belt to the high spot. They should not be used with steel cord belts or with snub pulleys.

Question 15

What is the largest pulley in the system?

Answer 15

Head pulley, is the largest and may or may not be the drive

Question 16

What are advantages of lagged pulleys?

Answer 16

Increase the coefficiant of friction resulting in lower belt tension, reduces belt slippage in wet conditions and increased life for the belt and the pulleys

Question 17

What is the major advantafe of a side lagged pulley?

Answer 17

They can be replaced without removing the belt.

Question 18

What is the purpose of a tail pulley?

Answer 18

The return the belt

Question 19

What is the purpose of a snub pulley?

Answer 19

It is used to increase the arc of contact on the drive pulley

Question 20

What pulley would be used to change the direction of the belt? (Example would bd to change direction for gravity take up)

Answer 20

Bend pulleys are used to accomplish this.

Question 21

Troughing idlers use 3 rolls, what are the angles they are?

Answer 21

20, 35, 45 (2 idlers engage and center roll is flat. \ __ / )

Question 22

Where does a gravity take up usually placed? And are usually used on belts greater than?

Answer 22

They are placed near the drive pulley and usually used on systems larger than 100ft between head and tail pulley

Question 23

Where is screw take ups used?

Answer 23

They are ysed on small and light conveyors and are located on the tail pulley

Question 24

Where is loading preferred on belt conveyors?

Answer 24

As closely to the center of the belt and in the same direction of travel (preferably at the same speed)

Question 25

What is the purpose of grizzlies?

Answer 25

It is used to seperate the lumped material allowing the fines to reach the belt before the lumped material cushioning the effect the lumped material has on the belt

Question 26

What feed is most commonly used with pneumatic conveyors?

Answer 26

Rotary feeders are the most used system

Question 27

Low pressure conveyors are limited to what psig?

Answer 27

12 psig

Question 28

What operating pressures do medium pressure systems use and use what to achieve this?

Answer 28

Between 15-45 psig and use positive displacement blowers.

Question 29

What operating pressures do high pressure systems use?

Answer 29

45-125 psig

Question 30

What are the most common types of material used for wear strips?

Answer 30

Polyurethane or Nylon

Question 31

Which of the following is done to ensure material does not jam between the skirt board amd the conveyor

Answer 31

The skirt board increases the clearance in the direction of belt travel

Question 32

If a belt slips on start up what is the probable cause?

Answer 32

Take up weights to light

Question 33

What is another name for rooftop chain and how is the material moved? (Vice versa as well)

Answer 33

Camelback, material moved 90 degrees to the belt travel and only bends in one direction

Question 34

How do S drives get their names?

Answer 34

The way the belt goes around the idler and drive looks like a S

Question 35

How are solid steel idlers situated at the loading point of a conveyor?

Answer 35

They are spaced apart from each other so that the material land between the rollers.

Question 36

What is the correct process of stopping a bucket elevator?

Answer 36

Stop the feed, empty buckets, lock out

Question 37

What is used to spice a belt in place with relatively few tools?

Answer 37

Double plate fastener

Question 38

What conveyor moves material parallel to the material length?

Answer 38

The roll case conveyor