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hydraulic and pneumatic part 1

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Subido el 11 de febrero de 2015 por Samuel E.

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hydraulic and pneumatic part 1

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machines and tools they help us to do work but do you know that many of these are pressure 00:00:08
machines which use either the hydraulic system or the pneumatic system let's first look at the 00:00:30
hydraulic system but in order to understand what a hydraulic system is and how it works we have to 00:00:39
know two facts the first fact is that when a liquid is enclosed in a space and a pressure 00:00:47
is applied to the liquid this pressure is transmitted equally to all parts of the liquid 00:00:57
this principle is illustrated using this pressure syringe when the piston is pushed down water 00:01:05
squirts out uniformly in all directions from the holes of the flask the second 00:01:17
fact is that it is hard to compress a liquid if you try to squash a volume of 00:01:25
liquid you still have that same volume however hard you try to compress it a 00:01:32
hydraulic system is one that uses the pressure of a liquid to perform 00:01:38
mechanical work let's look at this device two syringes a and B of equal 00:01:45
size are connected by rubber tubing if pressure is exerted at syringe a the 00:01:55
same pressure will be transmitted over to syringe B we also observed that the 00:02:04
water from syringe a will move to syringe B as shown by the upward 00:02:10
movement of the piston in syringe B this demonstrates the two facts which we have 00:02:16
just discussed that is firstly when a liquid is enclosed in a space and a 00:02:23
pressure is applied to the liquid this pressure is transmitted equally to all 00:02:30
parts of the liquid and secondly liquid cannot be compressed the hydraulic 00:02:37
system makes use of these two facts it can be shown mathematically that if we 00:02:47
make one of the two pistons much larger than the other then the larger piston 00:02:53
can raise a larger load the hydraulic system can therefore be considered as a 00:02:59
force multiplier do you also notice that the small piston has to move a larger 00:03:09
distance than the large piston in most cases oil is used as the hydraulic 00:03:17
liquid as it can lubricate the moving parts of the machine as well the 00:03:23
hydraulic principle is used in many devices like the hydraulic jet used for 00:03:30
lifting cars at the service station notice that the serviceman has to exert a force on the piston 00:03:35
many times before the car is raised by a small amount thanks to the hydraulic jack lifting a 00:03:46
car for servicing is no longer a problem one of the most important components of a car is the 00:03:54
brake system but do you know that the brake system of a car also works on 00:04:02
hydraulics let's take a closer look at the brake system of a car when the 00:04:09
driver presses on the brake pedal the oil in the brake system transmits this 00:04:18
pressure and moves these pistons this will cause the brake pads to press 00:04:25
against the rotating disc of the wheel. 00:04:35
Hydraulics is also used in many heavy machinery in the construction industry, like this loader. 00:04:44
Can you see the moving pistons in action? 00:04:54
Machines using the hydraulic system are capable of moving very heavy loads. 00:04:58
This is a dumper. 00:05:07
It also works on hydraulics. 00:05:10
The excavator is another hydraulic machine commonly found at construction sites. 00:05:17
The hydraulic system will cause pistons to move a part of the machine back and forth. 00:05:24
Imagine what it would be like if all this work had to be done without the help of these 00:05:31
hydraulic machines. 00:05:36
An accident? 00:05:43
Thank goodness it's only a practice for the Civil Defence Officers. 00:05:46
They're trying to rescue 00:05:51
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Idioma/s:
en
Autor/es:
deyidt
Subido por:
Samuel E.
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
115
Fecha:
11 de febrero de 2015 - 23:50
Visibilidad:
Público
Centro:
IES JOAQUIN ARAUJO
Duración:
05′ 53″
Relación de aspecto:
4:3 Hasta 2009 fue el estándar utilizado en la televisión PAL; muchas pantallas de ordenador y televisores usan este estándar, erróneamente llamado cuadrado, cuando en la realidad es rectangular o wide.
Resolución:
480x360 píxeles
Tamaño:
20.05 MBytes

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