DOCX

Lab Experiments Control of Hydraulic and Pneumatic System Lab

By David Woods,2014-06-20 13:08
10 views 0
Lab Experiments Control of Hydraulic and Pneumatic System Lab

     University Of Jordan

    Faculty of Engineering & Technology Mechatronics Engineering Department

     Hydraulic &Pneumatic System for Mechatronics Lab

    Experiments No.2

     Pneumatic Control of a Double-acting Cylinder

    Modified and Revised By: Eng. Rasha Noufal

    Objective: Students will be able to control of double-acting cylinder, and knowing various types of speed regulation of the piston rod movement of double-acting cylinder.

     Introduction

    Pneumatics system performs a variety of tasks, ranging from the very simple to the very complex. Controlling cylinders is one of the most important aspects of pneumatics. For example, two cylinders may be required to operate at the same speed, or a cylinder may need to extend rapidly under no load conditions.

     Pre-Lab

    Pre-Lab: the required pneumatic circuit diagrams using the automation studio SW; show the whole connections and components required for each circuit.

In the lab:Connect the circuits and verify their operation. sure that the pressure is 4 bars

    and is connected correctly.Double check your connections before switchingthe compressor on.

     Part one: Control of a double-acting cylinder

Direct control of a double-acting cylinder with push-button.

Aim:

    This exercise provides direct control of double-actingcylinders with manually operated 5/2directional control valves.In addition, the effect of adjustablespring cushioning in double-actingcylinders can be observed.

Task:

    - The piston rod of a double-working cylinder (Z1) should extend afteractuating a button.

    - After releasing the button (S1), the piston of the cylinder should retract automatically to

    its back position.

     Copyrights’ are held by University of Jordan

     Lab Experiments Control of Hydraulic and Pneumatic System Lab

List of equipment:

    Description:

    - (01) Air service unit (filterwith water separator, pressure regulator andpressure gauge)

    with3/2 directional controlball valve

    - (02) Distributor, 6-fold

    - (04)Double-acting cylinderwith adjustable springcushioning

    - (08)5/2 directional controlvalve with push-buttonAccessories

    Figure 1: Direct control of a double-acting cylinder

Conclusion:

    - The double-acting cylinder can be directly controlled by a ________________________.

    - In the basic setting (spring position) of a directional valve, port 1 supplied with

    compressed air, port 2 is always __________ and port 4 always____________.

     Copyrights’ are held by University of Jordan

     Lab Experiments Control of Hydraulic and Pneumatic System Lab

     Part two: Speed regulation of a double-acting cylinder

Aim:

    In this exercise, the various types of speed regulation (throttling) of the piston rod movements of double-acting cylinders with one-way flow control valves are looked at and the effects are observed.

Task:

    - The cylinder is controlled with a manually operated button (actuator S1). After releasing

    the button (S1), the piston of the cylinder should retract automatically to its back position.

List of equipment:

    Description:

    - (04)Double-acting cylinderwith adjustable springcushioning

    - (08)5/2 directional controlvalve with push-buttonAccessories

    - (15) Flow control valveswith non-return, adjustable

    Figure 2: Speed regulation of a double-acting cylinder

    Conclusion:

    Referring to figure 2, which circuit demonstrates the following?

    a. In Circuit (________): The speed of the cylinder piston is restricted when extending.

    b. In Circuit (________): The speed of the cylinder piston is restricted when retracting.

    c. In Circuit (________): Both speed of the cylinder piston are restricted.

     Copyrights’ are held by University of Jordan

     Lab Experiments Control of Hydraulic and Pneumatic System Lab

     Part three: Controlling a double-acting cylinder with impulse valve

Aim:

    In this exercise we examine how a pneumatically operated impulse valve functions when controlling a double acting cylinder.

List of equipment:

    Description:

    - (04)Double-acting cylinderwith adjustable springcushioning

    - (11)5/2 directional controlvalve, impulse valve

    - (15) Flow control valveswith non-return, adjustable

    - (06)3/2 directional control valve, with manually operated push-button

    - (07)3/2 directional control valve, with manually operated push-button, flow in both

    directions

    Figure 3:Controlling a double-acting cylinder by impulse valve System steps:

    - Start the system by pressing S1, the cylinder _____________________________________

    - After releasing S1, the cylinder ________________________________________________

    - When pressing S2, the cylinder ________________________________________________

    - If S2 is pressed momentarily, the cylinder _______________________________________

Conclusion:

    - Impulse Valves are always controlled by ______________________________

    - Is impulse valve has a basic setting?

     Copyrights’ are held by University of Jordan

     Lab Experiments Control of Hydraulic and Pneumatic System Lab

     Part Four: Displacement dependent control of a double-acting cylinder

    Aim:

     The displacement-dependent control of a double-acting cylinder by using limit switches in

    demonstrated in this exercise.

List of equipment:

    Description:

    - (13)3/2 directional control valves, with roller

    Figure 4 : Displacement dependent control of a double-acting cylinder Conclusion:

    - Design the functional diagram (stroke-time diagram) for thecylinder and the 5/2

    directional control valve.

    - What are used for a displacement dependent control of a double-acting cylinder?

    _____________________________________________________________

     Copyrights’ are held by University of Jordan

     Lab Experiments Control of Hydraulic and Pneumatic System Lab

     Part Five: Pressure-dependent control of a double acting cylinder

Aim:

    By using a 3/2 directional control valve with adjustable minimum pressure of response, a

    pressure dependent control (and in addition displacement dependent) control of a double acting

    cylinder is put into effect.

List of equipment:

    Description:

    - (21)Pressure gauge

    - (22) 3/2 directional control valve, with adjustable operating pressure

    Figure 5 :Pressure dependent control of a double-acting cylinder Conclusion:

    - Mention the conditions to extend the piston of the cylinder.

    __________________________________________________________________

    - Mention the conditions to retract the piston of the cylinder.

    __________________________________________________________________

     Copyrights’ are held by University of Jordan

     Lab Experiments Control of Hydraulic and Pneumatic System Lab

    - Design the functional diagram (stroke-time diagram) for the cylinder and the 5/2

    directional control valve.

     Copyrights’ are held by University of Jordan

Report this document

For any questions or suggestions please email
cust-service@docsford.com