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INTRODUCTION ( 15 minutes):
- With the aim of fostering cooperative work and learning by doing, first of all, students must form groups of 2-3people.
-Teacher gives each group a sheet with theactivities.
-All students of the class at the same time, do the activities step by step. The teacher is the responsible for guiding the activities and explaining the time they have for everyone.
DEVELOPING (30 minutes)
- A video will be watched. Students must do exercise 1. After that, they have to correct the activity guided by the teacher (self-assessment)
DEVELOPING (30 minutes)
- Students must do exercise 2 and then in common correct the activity.(self-assessment)
DEVELOPING (15 minutes)
- Students must do exercise 3.
- When finished, some volunteer students have to read their writing.
- Teacher pick up the worksheets in order to correct them, and check whether they have acquired the knowledge.
ACTIVITIES:
Excersice 1
Watch the following video on youtube,with subtitles, and write down as much vocabulary as you can,regarding pneumatics control:
https://www.youtube.com/channel/UC563HmrsBdHmzak43ZvygfQ
If any doubt,use an online dictionary,for example wordreference.com
Excerise 2
Visit this web:
http://www.festo-didactic.com/int-en/?fbid=aW50LmVuLjU1Ny4xNy4xMi4zNDU2
Click on : ”Symbols”, “Hidraulic” and draw 5 diferent symbols with their explanation. Check with your mates in order not to repeat symbols.
Compare different industries among those installed arround your city: did you know them?
Excersice 3
Visit this web:
Click on :”Student Portal”, “Unit converter”, and convert 5 types of units used in hydraulics and pneumatics.Please make sure they are different.
Download the 5/3 Closed-Center Valve Animation, and explain its internal operations in english with your own words.
ASSESSMENT
1-Translate into english the following technical vocabulary:
-Relé temporizado:
-Detector de posición:
-Detector por reflexión:
2-Choose the right answer: Pressure-sensitive sensors come in different designs:
Mechanical pressure switches with binary output signal.
Electronic pressure switches with binary output signal.
Electronic pressure sensors with analogue output signal.
All are true. T
3-Capacitive proximity sensors can be used to detect all materials with good electrical conductivity, for example graphite as well as metals. F
4-Inductive proximity sensors not only respond to materials with a high electrical conductivity (e.g. metals), but also to all insulators with a high dielectric constant (e.g. plastics, glass, ceramic, liquids and wood). F
5-Optical proximity sensors always have a transmitter and a receiver. A distinction is made between three types of optical proximity sensor: through-beam sensors,retro-reflective sensors,diffuse sensors. T
6- Translate into english the following technical vocabulary:
-Presostato mecánico con señal de salida binaria:
-Linea de retroalimentación eléctrica:
-Accionamiento indirecto de un cilindro de simple efecto:
7-Answer true or false: A distinction is made between the following types of proximity sensor:
• Sensors with mechanical switch contact
– Reed switches
• Sensors with electronic switch output
– Inductive proximity sensors
– Capacitive proximity sensors
– Optical proximity sensors. T
8-The ohmic resistance of a consuming device in an AC circuit must be measured using the indirect method.F
9-Choose the right answer:
a)The transformer serves to reduce the operating voltage. The main voltage is applied to the transformer inlet (e.g. 24 V AC), the voltage at the outlet is reduced (e.g. 230 V AC). F
b)The rectifier converts the DC voltage into AC voltage. The capacitor at the rectifier outlet serves to smooth the voltage. F
c)The voltage regulator at the power supply unit input is necessary to keep the electrical voltaje constant irrespective of the flow of current. F
d)All are not true. T
10-Translate into english the following technical vocabulary:
-Memorización de la señal mediante un circuito con relés y función de autorretención:
-Control manual de avance y retroceso con relés y autorretención:
11-A solenoid has the following structure: The current-carrying conductor is wound in the shape of a coil (air-cored coil). The overlaying of the magnetic field lines of all the coil windings amplifies the magnetic field. T
12-An iron core is placed in the coil. When an electric current flows, the iron is additionally magnetised. This enables a much stronger magnetic field to be generated at the same current intensity than with an air-cored coil.
13-Choose the right answer:
a)In electropneumatic control systems, solenoids are primarily used to influence the switching position of valves, relays or contactors. T
b)In electropneumatic control systems, solenoids are primarily used to influence the switching position of valves.
c)In electropneumatic control systems, solenoids are primarily used to influence the switching position of relays or contactors.
d)None is true.
14-In the case of a normally open contact (or N/O contact), the circuit is interrupted when the pushbutton is in its normal position. T
15-Choose the right answer:
a)Aluminium is the main conductive material used in control technology.
b)Silver is the main conductive material used in control technology
c)Copper is the main conductive material used in control technology. T
d)Plastic is the main conductive material used in control technology
16-Materials with a particularly high resistance to the electrical current are called electrical insulators. Rubber and plastic-based materials are used to insulate electrical cables. T
17-In the case of a normally closed contact (or N/C contact), the circuit is closed by spring force when the pushbutton is in its normal position. T
18- Choose the right answer:
a)Relays are also used in purely electrical control systems to separate the DC and AC circuits.
b)A relay is an electromagnetically-actuated switch where the control circuit and the controlled circuit are electrically separated from each other.
c)In the case of time relays, a distinction is made between relays with switch-on delay and relays with switch-off delay
d)All are true. T
19-Translate into english the following technical vocabulary:
-Memorización de señales mediante una electroválvula biestable:
-Control automático del retroceso mediante una electroválvula biestable:
-Conmutación retardada con relé:
20-Current measurement consists on connecting the measuring device in parallel to the consuming device.
21-The advancing of a cylinder piston rod is to be triggered using one of two independent input components, the pushbuttons S1 and S2. To this end, the contacts of the two pushbuttons are arranged in series. F
22-The piston rod of a cylinder is only to advance if the two pushbuttons S1 and S2 are actuated. To this end, the contacts of the two pushbuttons are arranged in pararel. F
23-If voltage always flows in one direction in the circuit, this produces an alternating current that also always flows in one direction. This is a direct current (DC) or a DC circuit. F
24-Choose the right answer:
a) Copper, aluminium and silver are not particularly good electrical conductors
b) Copper, aluminium and silver are particularly good electrical conductors. T
c) Copper, aluminium and plastic are particularly good electrical conductors
d)Copper, aluminium and plastic are not particularly good electrical conductors
25-Single-acting cylinders are supplied with compressed air at both ends , where they have a port for the compressed air supply. This means they can only work in one direction. F
26-Double-acting cylinders are supplied with compressed air at both ends. This means these cylinders can also work in both directions. T
27-Name the following pneumatics devices:
ASSESSMENT GUIDELINE:
- Solve simple pneumatics and hydraulics problems using simple and specific software.
-Perform a graphic bar indicating the number of each different data using a graphical model .
- Participate in the group activities and in a role play respecting the other peers
- Use the vocabulary ,regarding pneumatics and hydraulics controls in problem solving with an increasing level of accuracy.
- Read and understand simple questions in English with visual support.
- Write sohrt conclusions in English.
- Make some unit conversions with the help of an easy software.
- Write some simple valve’s operating mode.
Short url: https://clilstore.eu/cs/6202
