Technology small crafts how to do simple and beautiful as follows:

1, water pipe seesaw

1. Materials Uniform thickness and diameter of 3 centimeters, the length of 40 centimeters of the hard plastic tube a; thickness and plastic tube, the length of 5 centimeters, the equivalent of the cork stick a cork cork plugs two; two pieces of thin iron sheet; sewing needle a.?

2. Making tools A small hacksaw, scissors, awl and knife each.?

3. Production steps:

① Cut the plastic tube from the center, divided into two equal lengths, and drill a small hole in the top and bottom of each tube. Then use a 5-centimeter-long cork stick to connect the two sections of the tube, and use a sewing needle to pass through the middle of the cork stick.

② Cut two brackets and two little people from thin iron sheets and fix the little people on both sides of the plastic tubes.

③Fill the tube with water and plug it with a cork, place the sewing needle on the bracket and adjust this tube to balance on the bracket. At this time the water flows out rhythmically from the small hole under the tube.?

At this point, just press down on one end of the see-saw, and the see-saw will automatically buck and fall, with water dripping out on both sides in turn, until all the water is gone. Note, please put it in a basin so that the water doesn't wet the table. Think about why it will automatically cock up and fall down.

2, climbing stairs car

Carrying heavy things up the stairs is very hard, I saw the dog on the stairs, inspired by the action, designed to transport heavy things on the stairs of the car. When carrying heavy objects up the stairs, first push the front wheels of the cart closer to the stairs.

Pressing down the handrail, the front wheel is suspended, pulled up by the rubber band, and then push the cart, so that the front wheel on the stairs above; and then lift the handrail, the rear wheel is suspended, the rear wheel is pulled up by the rubber band, a little forward, so that the rear wheel on the stairs on the last level? This level by level, the car climbed up the stairs.

3, automatic pumping plug

Keep goldfish students may have experienced, in the use of the principle of the siphon to the aquarium water, in order to drive away the air in the tube, not first to the water pipe full of water, is to use the mouth to hold the end of the water pipe suction. This is unsanitary and inconvenient. Find a rubber stopper that is about the same size as the inside diameter of the water exchange tube (usually a rubber tube).

Through the center of the rubber plug tied a strong line, the other end of the line tied a small weight. Before changing the water, put the small weight tied to the line in from one end of the water exchange tube, and take it out from the other end. This way, the string passes through the water change tube and the rubber stopper is inserted into the end of the water change tube. When you change the water, put the end with the rubber stopper under the water.

Pulling a small weight with your hand pulls the rubber stopper out of the water exchange tube, and at the same time pushes the air out of the tube, so that the water continues to flow out through the tube. Home with a tank of water, you can also use this approach to the bottom of the tank sediment pumped out.