What are the good technological innovations and small productions? Be practical! 20

Homemade solar cooker Find a concave reflector bowl on a large flashlight, and use rigid styrofoam or wood to sharpen a cylinder about 4 cm long, with a diameter just enough to fit into the reflector. Drill a fine hole transversely at one end of the cylinder, insert a wire with a diameter equivalent to the diameter of the hole, and then fold the two ends of the exposed wire into 90°, leaving 5 cm each. Insert the cylinder into the hole in the reflector and insert the ends of the wire into a styrofoam or wooden baseplate.

Sharpen the two ends of a thin bamboo skewer, insert one end into the cylinder of the reflective bowl**, and insert a small piece of potato at the other end. Place the device in the sun so that the reflector is facing the sun, and then patiently adjust the length of the skewers so that the potatoes are in the right spotlight. It won't be long before the potatoes are roasted in the sunlight and give off their aroma.

The scientific and technological creation of small inventions and small productions are as follows:Tools required: paper cups, scissors, utility knives, markers.

The first step is to draw the pattern to be cut on the paper cup with a marker, as shown in the figure below

Step 2: Then use a utility knife to remove the bottom of the paper cup, as shown in the figure below

The third step is to crop along the drawn diagram, as shown in the figure below

The fourth step and the last convenient and practical mobile phone holder are completed, as shown in the figure below

Gas lifting machine.

If someone says that he can lift a 10-kilogram thing to a set height with his exhaled breath, you will definitely think that he is bragging.

Kwon: "How can there be such a thing? It's simply impossible! ”

However, if I tell you a simple way, the exhaled breath can lift a weight of 10 kilograms, and you can do it yourself, believe it or not, try it yourself.

Preparation: Place a sturdy rectangular paper bag or a plastic bag on the table, the size of which can fit two thick books. Put a whole bunch of books on top of it – take the thickest, heaviest book you can find. At this point, you can start blowing into the bag.

Note: The blow opening should be small, so that it is easier to blow and does not require a lot of effort.

Blow slower and more evenly. You'll notice that the air you blow out, when you get into the bag, slowly puffs up as the bag slowly expands, and you can easily lift up a lot of books on it. At this point, you'll get excited – the breath I exhale has such a magical effect!

In fact, as long as the size of the paper or plastic bag is 10 cm to 20 cm (200 square centimeters), you only need to blow a little more air than one atmosphere to make the bag get a force of 20 kg. Therefore, it is easy to lift a weight of 10 kg.

Technological gizmos are coming.

Refrigeration fan: First of all.

Assemble the engine point bracket of the refrigeration fan, then assemble the engine and the between, and then use cardboard to make the shape of the refrigeration fan, as well as the switch.

Science and technology gadget kaleidoscope: prepare tin foil, paper tube, paste tin foil on the inner wall of the paper tube, then decorate the paper tube with colored paper, put many five-pointed stars in the paper tube, and finally seal the paper tube.

Science and technology invention trolley: first prepare a battery, a pencil, break the pencil, paste it at the bottom of the trolley, then press the wheel of the trolley, and then press the motor and switch.

Science and technology gadget strip puller: first remove the blade of the pencil sharpener, then find 6 spacers, use screws to fix the 3 spacers on the table, and then fix the blades on the spacer.

Innovative gadget production method 1, homemade badminton.

Prepare materials: 1 empty drink bottle, 2 foam fruit net covers, 1 rubber band, 1 glass marble.

Production process:1Take a 250ml empty beverage bottle and cut off the top half of the bottle;

2.Divide the cut part into 8 equal parts, cut it to the neck of the neck with scissors, and then cut each part into the shape of petals of the same size;

3.Put the foam fruit net sleeve on the outside of the bottle and fix it at the mouth of the bottle with a rubber band;

4.Wrap another foamed fruit net around a glass marble, stuff it into the mouth of the bottle, plug it tightly and expose about 1 cm;

5.Cut off half of the ping pong ball, cover the bottom of the hemisphere on the mouth of the bottle, cut the four sides into a whisker, cover the mouth of the bottle and fix it with a rubber band.

6.After beautification and retouching, a homemade shuttlecock was completed. Hit a dozen with a badminton racket and see how it goes?

2. Homemade soap paper.

Materials and tools for crafting:

Hygroscopic white paper, small pieces of soap, a brush and disposable beverage cans.

Production method: first chop the soap and put it in the jar, put the cup on the stove after filling the appropriate amount of water, wait for the soap to melt, cut the white paper into the size of a matchbox, apply the soap liquid one by one, and then take it out to dry it to become soap paper.

3. Homemade hot air balloons.

1.First of all, we cut 6 to 8 leaf-shaped pieces of paper out of soft paper.

2.Fold them in half and glue their edges together to make a balloon.

3.Tape the four wires to the bottom of the balloon. Attach the other end of the thread to the table with plasticine.

4.Try to turn the speed of the hair dryer as slowly as possible. Aim the blower up at the bottom opening and turn the switch on. The balloon will slowly grow larger, tighten the string, and leave the table.

4. Homemade flashlight.

The specific method of making it is to remove one end of the lid of a waste can (such as a Lulu beverage can) and knock the other end with a round hammer. Roll up two No. 1 batteries with thick corrugated cardboard and put them into the tank with the positive electrode facing up and the negative electrode facing down.

Find a suitable plastic lid (such as a magic big roll lid that can be fastened to Lulu cans) and dig a small circular hole in the lid** in such a size that the bulb is plugged in tightly. Insert the base of the bulb into the small hole. Take a piece of wire hunt and peel off the wire skin at both ends, wrap one end around the lamp base, and pierce a small hole through the side of the plastic cover with the other end.

Place the plastic lid over the can. Check that the bulb and battery are in close contact. At this point, the disposable flashlight is ready.

When using, use your thumb to press the wire threaded from the side wall on the weld that is not painted from the can, the flashlight will glow, and the thumb will jump off the wire, and the flashlight will go out, which is very convenient to use.

Production of scientific and technological innovation works for primary school students.

** Weather paper flowers.

Materials: pink colored paper, disposable paper cups, straws, decorations, salt water, newspaper making process: cut the pink paper into petals, coat them with salt water to dry, stick them at one end of the straw to make flowers, set it up in the paper cup with your hands**, stuff the newspaper on both sides to make soil (add water to the newspaper, press tight), and decorate.

The petals are intensely colored, and soon the weather will be wet or rainy, and when it is light, the weather will be clear.

That small motor, install the wire, add a small fan blade and battery, and then press the positive and negative poles to install it.

It is recommended to buy Zhang Xiaodong's "One Electronic Production a Day", which is not expensive, I hope there is something you like in it.