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Applied Fluid Power > Final > Flashcards

Final Flashcards

1
Q

level switch

A

wants to know level of fluid

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2
Q

proximity switch

A
  • non contact

- three kinds: inductive (ferrous objects), ultrasonic, and capacitance (non-ferrous)

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3
Q

off delay timer switches

A

delay only when they are deenergized

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4
Q

cushion spear/sleeve

A

tiny flow control valves inside of a cylinder

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5
Q

emergency switch

A
  • keeps circuit safe
  • will stop circuit in middle of cycle
  • cycle stop will wait until cycle has ended
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6
Q

flow control valves need to be as close as possible to cylinder:

A

difficult to control air because air is very compressible

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7
Q

pressure switch

A
  • turns compressor on/off

- if it fails, safety relief valve kicks in and sends air to the atmosphere

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8
Q

pressure regulator

A

usually set around 120 psi because it doesnt need very high pressure

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9
Q

pneudraulics

A

smooth movement of hydraulics with cheapness of pneumatics

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10
Q

determining compressor size

A
  • add up all airflows needed for all cylinders and motors
  • have some stand by capacity
  • be ready for future expansion
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11
Q

sizing of volume or receiver tank for compressor

A

use a nomograph

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12
Q

dryers

A
  • water is the enemy

- volume tank has manual/automatic drain

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13
Q

3 types of dryers

A
  • absorption: uses chemicals that absorb water (LiCl2, Al2O3)
  • adsorption: keeps water on surface, uses silicon gel
  • refrigerant type dryer (heat dryer)
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14
Q

FRL

A

filter, regulator, lubricator

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15
Q

Bernoulli’s law

A

velocity goes up so pressure goes down

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16
Q

max vacuum pressure

A

30” Hg

17
Q

air motor types

A
  • radial/axial piston
  • sliding vane
  • gear
18
Q

couple

A

two forces that are equal and opposite but not in line

19
Q

types of non-contact sensors

A
  • photo eye
  • proximity: inductive, capacitance, ultrasonic
  • pressure switch/temperature switch
  • level switch
20
Q

contact sensor

A

limit switch

21
Q

photo eye scanning methods

A
  • opposed scanning: one side is a transmitter, one side is a receiver, they must line up perfectly
  • reflective scanning: transmitter sends beam to reflective surface and reflective sends back to receiver
  • diffused scanning: transmitter sends beam to object and object acts as reflective to send beam back to receiver
22
Q

receiver side: how does it work

A
  • photo resistor: when light hits it, resistance changes
  • photo diode: when light hits it, it conducts
  • photo transistor: when light hits base, it conducts
  • photo voltaic: has voltage when light hits it
23
Q

detent

A

a small spring that prevents spool from accidentally shifting

24
Q

relay

A

a transfer device for electrical energy, consists of a coil and contact(s)

25
Q

holding relay principle

A

coil relay is locked in through its own contact

26
Q

manual mode

A
  • operator can control certain components without circuit automatically operating
  • beneficial for troubleshooting
  • operator must push jog buttons to turn on certain devices
  • if on auto, these buttons are locked out
27
Q

guard door

A

put around circuit, if guard door is open = circuit wont work

28
Q

rules for electrical circuit design

A
  • push buttons and contacts always go on the hot side (left)

- solenoids, relays, lights, etc. always go on the cold side (right)

29
Q

center drill vs regular drill

A

center drill drills a hole into the object and then regular drill drills the rest of it

30
Q

5 ported valves

A

use 5 ported valves to control speed

31
Q

venturi suction cup

A

creates a vacuum which creates a suction cup grip = picks up/lets go of part

32
Q

hydraulic servo valve

A
  • directional and flow control valve

- can position spool anywhere in stroke

33
Q

desirable features of pneumatic systems

A

cleanliness, high speeds, temperature stability, and overload safety

34
Q

undesirable features of pneumatic systems

A

cost, force, compressibility, and lubrication

35
Q

3 types of compressors

A

reciprocating piston, diaphragm, and slide vane rotary

Applied Fluid Power (11 decks)

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