Transcript Document

Equipment Familiarization
Experiment 1-2
Amatrol 850 Basic Hydraulic Training System
Equipment Familiarization
Objectives
1. Identify each of the components in the 850 basic hydraulics
system.
2. Set up the 850 basic hydraulics system bench. (Satellite will not be
used)
3. Prepare the hydraulic power unit for use.
4. Operate a hydraulic power circuit.
5. Set up and operate a basic hydraulic circuit on the 850 trainer.
Equipment Familiarization
The 850 system includes both Hydraulic as well as
Pneumatic training equipment with the majority of
focus given to the hydraulic trainer. The bench itself is
mainly for storage, holding additional components, and
to house the power unit. Earlier models located the
power unit in a slightly different position. The modules
may be moved where ever necessary and modules may
even be used in pairs if needed. The benches roll but
have been locked in place for safety reasons.
Inventory
The loose components consist of Tee fittings, Male
connectors, Friction shaft and Clamp, and a Load spring.
Although the loose components should be kept on the
machines, they do tend to stray off and therefore may
necessitate locating as they may be found in different
locations.
Valve Modules
One of the most important features of the pneumatic valve module is
its transparent valve assemblies. Transparent components allow for
internal inspection without the need of disassembly. Another
difference is that the pneumatic valve module includes the actuators
whereas the hydraulic module does not. The pneumatic module has
a directional control valve, 2 check valves, single acting cylinder, a
pair of cylinders, and a motor. The hydraulic module has one
Directional Control Valve(DCV), a pair of check valves, a single
needle valve without a check, and a pair of pressure control valves.
Equipment Familiarization
As can be seen from the illustration above, the primary
function of the bench is to serve as a storage facility for the
modules, provide a surface on which circuits may be
constructed, and to house the power unit.
Instrumentation Modules
The instrumentation modules are very similar but there exists some
differences worth noting. The pneumatic instrumentation module
has a pressure control valve whereas the hydraulic module does not.
Also, the pneumatic module has a second pressure measurement tool
used to observe very low pressures. Each of the modules uses a flow
meter, the pneumatic meter measure air flow in standard cubic feet of
air per hour(SCFH), and the hydraulic meter in gallons per
minute(GPM).
Hydraulic Actuator Module
The hydraulic actuator module has the same type of
cylinders as the pneumatic module does. It also has a pair of
flow control valves, with bypass checks, and a hydraulic
motor which may or may not have a flywheel attached. Its
important to remember that there may be some difficulty
encountered when attempting to install or remove the
flywheel. Under no circumstances should the flywheel be
forced on or off the shaft. Always consult the instructor if a
problem is encountered.
Loose Components
Each of the trainers was originally equipped with about eleven
hoses, 3 Tee fittings, 2 Male connectors, a Flywheel for the motor, an
Extension piece for the friction shaft, a Friction shaft, a Clamping
device for the friction shaft(not shown on page 7), and a Load
spring. There have been many additions to the loose components. If
what you need is not located on your machine, check the drawers of
the other machines for the components.
Hydraulic Power Unit Inspection
Refer to Video One
The power unit supplied with the trainers were designed for
intermittent use only. Before startup, make sure that the stop button
is in the OFF position, the oil level is above the RED line, the
Pressure is at minimum setting, and the power cord is unplugged.
Also, the yellow valve should be in the DOWN position. If the unit
fails any of these checks, report it to the instructor immediately.
Hydraulic Power Unit Inspection
Make sure the power is off.
Plug in cord after checking the
controller.
Always be certain that the power unit will not start the
moment you plug in the power cord.
Startup and Shutdown Procedures
Startup
1.
Perform Inspection of power unit.
2.
Assemble circuit.
3.
Start power unit and adjust pressure to specifications.
4.
Open yellow valve.
5.
Operate circuit and record readings.
Shutdown
1.
Reduce pressure to minimum.
2.
Shut off power unit.
3.
Cycle any DCV in the circuit.
4.
Close the yellow valve.
5.
Disassemble circuit.
6.
Clean up machine, modules, hoses, and area.
Power Unit Start Up
Notice that on start up, even before the pressure is
adjusted, that some pressure develops on the pressure
gauge.
Connecting Circuits
Connecting circuits is easy and very fast thanks to the
quick connect feature of the hoses. Although this is not
the industry standard, it suits our purpose well because
breaking fittings loose is time consuming and would take
away from the overall lab experience. Connections
should never be made while the machine is running and
this is consistent with OHSA lock out-tag out. If
difficulty is encountered while attempting to make a
connection, make sure that the machine is off and that
the lines are not under pressure. Any oil spills should be
cleaned up immediately.
Connecting Circuits
You will notice that a little oil leaks out of the
connectors every time they are disconnected and
this is normal. This minor leakage
Basic Circuit Demonstration
This video is a demonstration on the setup of a basic circuit
that uses a double acting cylinder.
General Safety
1. Observe all safety precautions.
2. Be conscience of where your hands are at all times.
3. Always wear safety glasses in the lab.
4. Read all instructions before you attempt to work on the
equipment.
5. Respect pressurized fluids as you would any energy form.
6. Keep an eye on the people around you.
Review
1. Which piece of the training equipment is for storage?
2. What is the safe maximum operating pressure of the 850 trainer?
3. Explain the startup and shutdown procedures.
4. What does it mean if a connection cannot be made?
5. How should you find the power cord prior to start up?
6. What must be done at the end of lab each day, immediately
following the last experiment?
7. Describe the setting of the pressure control valve on startup.
8. Are the power units on the 850 trainer designed for continuous
duty?
9. Why doesn’t oil pour out of the hoses when they are disconnected?
10. How is pressure determined at the power unit?