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Electro-pneumatic circuit for cutting cartons using a die-cutter in an industry

OBJECTIVES

Understand the multiple control of a double acting cylinder with a single solenoid valve.

         • Check the operation mode of a quick release valve.

DESCRIPTION

In a pneumatic shear, cardboards must be cut by means of a die.

When pressing two NO electric pushbuttons indistinctly S1 or S2,the cutterbar holder has to move forward and cut the cardboard by the action of the cylinder A, by means of a lever. When releasing both pushbuttons or when activating the emergency-stop control switch S3 NC with interlocking, the shear will return to its initial position.

The lowering speed of  the cutterbar holder must be adjustable, and the rising speed must be as fast as possible.

 

 

 

 

 

 

 

 

INSTRUCCIONS

ACTIVITY 1(10min)-Write down the GRAFCET diagram.

ACTIVITY 2(10 min)- Write down the logical equations according to the description above, with both direct and indirect control.(self-assessment)

direct control: Y1=(S1+S2)*/S3

indirect control: Y1=K1=(S1+S2)*/S3

ACTIVITY 3(10min)-Complete the list of required material.(self-assessment)

MATERIALS

1: double acting cylinder

      1: one way flow control valve

1 : quick exhaust valve

1: 5/2-way single solenoid valve with spring return:

0 or 1: relay (1 NO):

2: NO electric pushbuttons:

1: emergency-stop control switch, NC with interlocking:

ACTIVITY 4(15min)-Carry out the electric circuit diagram with its standard symbology.

ACTIVITY 5(15min)-Carry out the pneumatic circuit diagram with its standard symbology.

ACTIVITY 6(60 min)-Connect the electro-pneumatic elements to the mounting panel according to the instructions and check the operation.

 

CLARIFICATION

-Perform both circuits in two modes: direct and indirect control mode.

-Use a 5/2-way single solenoid valve with spring return.

 

ASSESSMENT

1-Draw a indirect drive electrical scheme:

2-Draw a direct drive electrical scheme:

3-In the case of a normally closed contact (or N/C contact), the circuit is interrupted when the pushbutton is in its normal position. ( T or F )

4-In the case of a normally open contact (or N/O contact), the circuit is closed by spring force when the pushbutton is in its normal position. ( T or F )

5-The changeover switch combines the functions of an N/C contact and an N/O contact in one device.( T or F )7-

In the case of a pushbutton, the chosen switching position is only maintained for as long as the pushbutton is actuated. Pushbuttons are used in doorbells, for example. ( T or F )

6-In the case of a detenting switch, both switching positions (ON/OFF) are mechanically latched. Each switching position is maintained until the switch is actuated again. Light switches in houses are an example of a latching switch in use. ( T or F )

7-Capacitive proximity sensors not only respond to materials with a high electrical conductivity

(e.g. metals), but also to all insulators with a little dielectric constant (e.g. plastics, glass, ceramic, liquids and wood). ( T or F )

8-Inductive proximity sensors can be used to detect all materials with good electrical conductivity, for example graphite as well as metals. ( T or F )

9-Reed switches are magnetically-actuated proximity sensors. They consist of two contact blades in a small glass tube filled with protective gas. They are not maintenancefree. ( T or F )

10-The purpose of sensors is to acquire information and to forward it in an evaluable format to the signal processing system. ( T or F )

11-A relay is an electromagnetically-actuated switch where the control circuit and the controlled circuit are electrically separated from each other. ( T or F )

12-Materials with a particularly high resistance to the electrical current are called electrical conductors. Rubber and plastic-based materials are used to insulate electrical cables. ( T or F )

13-A double solenoid valve is a component that retains its switching position even if the associated solenoid coil is no longer energised. This means it can not fulfil the function of a memory. ( T or F )

14-Retro-reflective sensors have transmitter and receiver units that are set apart. If an object, workpiece or even a person enters the path between the transmitter and receiver, the light beam is interrupted and a signal is triggered that initiates a switching operation at the output (ON/OFF). ( T or F )

15-In through-beam sensors the transmitter and receiver are arranged side-by-side in a housing. The reflector reflects the light beam from the transmitter to the receiver. ( T or F )

16-Diffuse sensors can only be used if the workpiece or machine part to be detected is highly reflective (e.g. metallic surfaces, light colours). ( T or F )

 

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