Seek simple, practical and valuable scientific inventions.

My family specializes in raising ducks. Grandpa picks up hundreds of duck eggs by the pond every day. Get down and stand up.

At first ... it made my grandfather's back ache and his legs hurt. I have tried many times to reduce grandpa's workload.

An egg picker is designed. Grandpa can pick up the eggs and put them in the laundry basket without a cat's waist.

Find a bamboo tube about 25 cm long and slightly larger in diameter than duck eggs, and one end is sealed with bamboo joints.

Saw the other end at an oblique angle. Saw off the lower part of 1/4 along the circular end face of the bamboo tube. Then put a wooden handle on it.

The side of the bamboo tube. The production is finished.

When in use, the bamboo tube is laid flat on the ground, with the oblique mouth facing the duck eggs, and the eggs are put into the tube at one time.

You can pick up five eggs and put them in the basket.

a surname

Automatic chicken feeder

In the process of helping my mother feed the chicken, I found that adding feed to the chicken is also a science: adding too much,

If you can't finish eating, the chicken will go up and step on the plane, wasting feed; If you add less, the chicken will starve to death. If it is added automatically.

Just eat the trough, add as much as you eat automatically, and don't add it when you are full.

According to this idea, I designed an automatic chicken feeder (pictured): the feed is rectangular on it.

In the material box, the bottom and groove of the material box are formed by bending a piece of iron sheet, and there is a rigid rod between the bottom and the front side plate of the material box.

A crack in the leaking grain. When the chicken pecks, the trough vibrates and the feed keeps falling from the gap to replenish it.

Feed in the trough. Stop pecking, the feed won't leak.

Zhu De prints

Automatic water feeder

This water dispenser is simple in structure and convenient for poultry and livestock to drink.

As shown on the right, nail an upright post at the edge of the sink and nail two bottle clips made of lead wire.

First pour some water into the sink, then fill the bottle with water, block the mouth of the bottle with your fingers and buckle the bottle upside down in the clip.

Son, put the bottle next to the water in the tank. Let go of your fingers, and the water in the bottle will not flow out. This

It is atmospheric pressure at work. The chicken goes to drink water. When the water level in the water tank drops to leave the bottle mouth, the air will

Will enter the water bottle from the bottle mouth, and the water will flow into the water tank. When the water level in the water tank is flush with the bottle mouth,

The water stopped flowing. This is a water feeder that can automatically add water.

If you want to feed water to livestock, you can make a big water feeder, as shown in the left picture. But be careful.

What's more, the bucket cover behind the wall must be tightly covered, so as not to leak air.

Wang Jun

Automatic siphon

The most convenient way to change water in a fish tank is to suck out old water with a siphon and then inject new water. Previously,

It is inconvenient to suck water into the siphon with your mouth or add a piston in the siphon.

So, I designed the automatic siphon.

The automatic siphon is shown in the figure. At the lower end of a section of latex tube (or plastic pipe), there is a plastic.

The sieve cover of the medicine bottle was modified, and there was an air bag at the upper end of the tube, which was transformed from a ball with two holes.

Fill the hole with the valve tube on the bicycle inner tube, and then sleeve the latex tube on the valve tube; The other hole is made of water.

Cave.

When in use, first block the water outlet hole with your fingers, pinch the rubber ball tightly, and immerse the end of the screen cover in water.

Slowly relax the ball. When the water is full of latex tube, hang it out of one end of the water hole and the water will automatically flow out.

Jerry Lee

Magnetic grass mixing stick

In the past, a cow in the production team died of illness, and a lot of iron was taken out of his stomach. After the implementation of the responsibility system,

My family feeds a cow. Every time I feed the cows, my father carefully screens them and puts nails, wires,

Pick out the iron filings.

Eating iron by mistake is so harmful. How can I pick it up quickly? I'm stirring the straw.

Magnets are installed at the lower end of the reed horn to absorb iron from the forage while mixing the grass.

I stopped. I named it the magnetic grass stirring rod.

Yang Jianan

Let cats and dogs be afraid of chickens

Several families in our team have cats and dogs. When they see chickens, they catch them and eat them. Cats and dogs have been around for 0 years. 39860 . 68686868686

A family bought more than 300 chickens, and all of them were eaten by cats and dogs in less than 20 days. My family also has chickens.

I also have cats and dogs. Cats and dogs don't eat chickens, and they are a little afraid of chickens. Why?

At first, my mother bought a chicken. She didn't dare to put it on the ground, but put it in a basket and hung it high.

Take the bait. When I was at school, I saw a group of bees and thought: people are bigger than bees, but they are afraid of bees, so

This is because we are afraid of being stung. Won't you try to scare cats and dogs and make them afraid of chickens?

I grabbed a chicken in my right hand and let the head of the chicken stick out of the tiger's mouth with a needle between my thumb and forefinger.

The needle tip is a little longer than the chicken's mouth. Then grab the cat and dog and stick it with a needle hidden under the head of the chicken.

Mouth and nose, a dozen times, for three or four days in a row. Ha! How effective! Cats and dogs see chickens.

Fear, not only dare not jump on the chicken, but also make way for the chicken. When cats and dogs are eating, chickens will scramble to eat.

As soon as the cat and dog saw the chicken coming to the bowl, they dodged.

Zang Ronghua

Flip mousetrap

After many experiments, I designed a good way to catch mice.

Find a deeper water tank (a bucket will do). Use plywood or other thin plates and saw them to diameter.

For the wafer that is about 5 mm smaller than the inner diameter of the water tank, a thin sheet that is longer than the outer diameter of the water tank is fixed at the center line of the wafer.

Rod, as a flap. The lighter the flip material, the better.

After turning over the plate, put both ends of the thin rod on the cylinder mouth, and one side of the turning over plate is also placed on the cylinder mouth, so as to facilitate the plate surface.

Parallel to the cylinder opening, so that the flap can rotate freely at the cylinder opening.

When in use, put a little water in the water tank; Several mice are fixed on the side of the flip cover that is not on the cylinder mouth.

Love food. A greedy mouse will drown as long as it is trampled over.

Zhangduxiang

Sand collecting trough

Our school pumped water with a pump, but it stopped for a while. Our science and technology team pumps water.

When the pump was disassembled, the sand in the original well water accumulated in the pump and stuck the impeller.

In order to prevent sand from flowing into the water pump, we installed a veil in front of the impeller. Unexpectedly, I was smoked for a while.

When the water was full, it stopped. It turned out that the sand blocked the pipeline in front of the veil.

Finally, we installed a vertical downward pipeline in front of the mantle, and the lower end of the pipeline was sealed with a cover.

The sand trap is made. The sand pumped up with the water is blocked by the veil and automatically enters the pipeline below.

In this way, the water pump finally works normally.

Cui Chenghua

Tank car

Can you lift a big bucket of water?

I can! Find six strong wooden sticks and two axle wheels (other wheels are also acceptable) and load the car according to the figure.

Water wheel Hang an iron hook on the front of the car. When lifting water, hang the bucket on the hook and push it by hand.

Just leave by car. This kind of car can also be used to transport coal or other things without blowing off dust.

The waterwheel uses the lever principle.

Guo Hao

Water level warning

Dad is responsible for looking after the water pump in the nursery. The pump house is under the slope and the pool is on the high slope, which is far away.

Yes I can't see whether the water in the pool is full in the computer room, so I often go to the pool to check.

In order to avoid running back and forth, I designed a water level reward device for my father.

As shown in the figure, the square wood with contact and the square wood with electric bell, power supply and switch are fixed on the edge of the pool.

The board is fixed in the computer room. When pumping water, close the knife, the water is pumped to a certain level and touched on the wire.

As the buoyancy of the float rises, it is connected with the fixed contact, the circuit is connected, and the electric bell in the machine room rings.

I know the swimming pool is full.

When not pumping, pull the knife away.

Zhong Yongping

Paddy field irrigation water level controller

In order to get a good harvest of rice, water managers often irrigate rice fields according to their conditions.

This automatic water level control device is designed according to the principles of buoyancy and lever, and is installed at the gate of the rice bed.

In fact, as long as you open the gate and adjust the buoy according to the required water level, you can safely release water.

When the water level meets the requirements, the gate will be automatically closed to stop irrigation.

The device is shown in the figure. Pull open the gate with a pull rope, then lift the brake lever and hold the plug.

The water is full. If the water level reaches a predetermined height, lift the buoy and the lever will press the brake lever down to release it.

Bolts and gates are pulled down by rubber bands, and the water inlet is closed.

Jiangxi province fengxin county chengguan town primary school science and technology team

An unsinkable bucket

There is an eye well in front of my hometown in the countryside. When drawing water, people often throw buckets into wells.

It took a lot of effort to catch it. I want to, want to, have it! You can make a double-bottom bucket.

There is a gap between the double bottom to prevent it from entering the water. If the bucket falls into the well, it can float on the water.

Fishing is easy. The size of the double-bottom space should make the weight of water in the bucket greater than that of the iron bucket itself.

Quantity.

Zhang Xiaoge

Bucket with valve

When drilling a well, you should throw the rope and turn the bucket upside down. Sometimes the bucket swings for a long time without falling down, really.

Urgent.

I thought of a way to open a hole bigger than an egg at the bottom of the bucket and cover it with a piece.

Thick rubber, fixed with nails on one side. In this way, put the bucket into the well and the water will flow in from the hole.

Bucket. The bucket is full of water. When you lift it, the pressure of water presses the rubber down and covers the hole, just like

It's like installing a valve at the bottom of a barrel.

This kind of bucket is specially used to carry water, saving time and effort.

Shen Wenhua

Looking for the magnet of the bucket

The bucket fell into a deep well and it was difficult to salvage it.

If the bucket is made of iron, you can tie the magnet in the well with a rope and turn it several times.

Touch the iron bucket and suck on it. Just put down the hook according to the position indicated by the magnet.

The search scope was greatly narrowed, and the bucket was easily fished out.

Zheng atao

Safety pulley

Shake water with a pulley. If you drop it, the pulley handle will easily hurt your arm.

I installed anti-rotation teeth on the pulley as shown in the figure, so it won't reverse. When unloading the bucket, just put the

Move the locating teeth upward.

Tian

Windmill winding

My mother does manual work at home and often winds the thread. She wound a big shaft "Baota Line" on a wooden shaft.

It is not easy. I saw the front and back doors of the room open. I saw China through a lot of traffic.

Youth Daily introduced a small wind power production, so I made a winding machine with through flow.

Please look at the picture to practice.

Wuxiangshu

Plastic adhesive

Plastic bags or plastic film products are broken, so you can repair them yourself. I heat them according to plastic.

According to the principle of fusion bonding, a simple bonding iron is designed and the effect is good.

Take a copper coin (or a small round iron piece) and drill a small hole in the center of the circle. Find a metal tube (length from

), one end opens a groove according to the radius of copper coins, and a pair of small holes are drilled at the groove end. Put the copper coins in the groove.

Align the central hole with the small hole, take the iron wire as the axis, pass through the small hole, and fix the copper coin at the slot end of the metal pipe. pay attention to

Copper coins must be able to roll freely in the groove. The other end of the metal tube is sheathed with a plastic tube or a bamboo tube.

Handle.

When gluing, put the plastic film to be mended on the table, stick a cellophane on it, and put it on the table.

The adhesive is heated to about 100 degrees Celsius and rolled on cellophane with appropriate pressure. If the temperature is high, get out.

Move faster and the pressure can be smaller; Low temperature, slow rolling speed and high pressure.

Zhu Qingyang

Condensing screen

The light at home is dim, and reading writing homework at night is easy to damage your eyes. I designed a condenser screen.

Can increase the brightness of the reading place.

Take three thin wooden boards of suitable size (cardboard is also acceptable) and connect them with hinges. Stick a bag on one side.

Tin foil for cigarettes. When reading at night, pull it out and stand on the table. The light is reflected by the tin foil.

Can gather in the place where the books are placed.

Surrounding with three mirrors as above can also play a role in gathering light.

Zheng Chen

Guaiguai

There is something wrong with my leg. I have to walk with crutches. But when I waited in line for the bus, I was very tired.

I'm afraid other disabled people have the same difficulties. What should I do if I can take a folding chair with me?

It would be nice not to increase our burden. So I meditated on crutches.

After repeated consideration, drawing and experiment, a portable and practical dual-purpose crutch (pictured) was finally designed.

A sitting board is added in the middle of the crutch, and the upper part is connected with the crutch double columns through hinges, and the lower part is connected with the crutch through hinges.

Crutch single column connection. It folds up as a crutch and stands up as a folding chair.

Cao Wanyu

Three-legged multipurpose ladder

This ladder has only three legs, but it has many uses, such as double ladders, single ladders and trolleys.

Split the three legs and hang the hook below, just like a four-legged ladder, it becomes a double ladder. Put the third leg

Turn it up along the middle hinge and insert bolts to fix it, so that two ladders can be connected to form two legs.

Single ladder. Pull out the shaft of the middle hinge, remove the third leg, and the ladder with the remaining two legs becomes a car again.

Trolley This design not only saves materials, but also has many uses, which fully shows the potential of a tool.

Zhang Zhongdong

Simple microscope

I designed a simple microscope, which is all junk. Find an empty toothpaste shell and cut off your neck.

Wash the parts above the department Cut a small piece of scotch tape and stick it on the nozzle of the toothpaste shell. It is.

Stage.

Find an awl and drill a small hole in the center of the top of the toothpaste shell cover. Gently smash a small waste electric bead.

Take out the condensing glass ball on your head and embed it in the small hole, and it becomes an eyepiece. Place the specimen to be observed.

Put (such as spider's feet) on the stage, cover the toothpaste shell and rotate the cover (that is, adjust the focal length).

Until you can see the image clearly.

Ping Cheng

Flashlight microscope

Cut a disk with the same size as the flashlight glass with cardboard or cards, and set a spotlight in the center.

The glass ball in the electric ball is used as the lens. As shown in the figure, put the observed object in the center of the flashlight glass.

Then put a small spring on the glass, put a circular piece of paper with a lens on it, and then put it in the flashlight together.

Boss, the microscope is ready.

Turn the screw ring on the flashlight head to adjust the distance between the lens and the object. The light of a flashlight can

For lighting.

Li Weixian

Dual-purpose pad

When I do my homework, I often can't find a ruler. I thought of a way and borrowed a ruler from my classmates.

Draw it on the pad according to the scale on the ruler and mark it with numbers. Ha! I have a dual-purpose pad. Classmate.

Ladies and gentlemen, please have a try!

Guo Yuefeng

Dual-purpose eraser

When you do your homework, you should use an eraser to write typos and make mistakes. After wiping, you will always

Leaving some rubber crumbs and paper wool, I had to put down my pen and pat it off by hand, which was quite annoying.

"I wish I had a brush." Yes! You can make a dual-purpose eraser yourself. Put the discarded brush head

Take it off, clean it and stick it on one end of the rubber. It would be nice to wipe the words at one end and sweep the rubber residue and paper wool at the other.

Ah.

Xiaoyu Chen

paper clip

Teachers often send out some handouts and review materials, which are scattered and not only easy to lose and tear,

And make the schoolbag a mess.

Later, I made two kinds of paper clips. One is to cut two thin pieces of wood or bamboo and make a slot in the middle.

Drill two holes. Sandwich the paper between wood chips (bamboo), align the holes in the wood chips, and drill holes in the paper.

Just tie a rubber band or string in the hole (right).

The other is to bend a shelf with iron wire, reinforce both ends with iron sheets, and install rubber bands and snaps.

Sometimes, if there is paper in the middle with buttons on it, it becomes a good lecture folder (left).

Yangdong group

"Book folder"

Buy a new book, put it on the table, read it, and the book will automatically close. I use ink.

The bottle pressed the open page, and soon the ink bottle slipped down again.

I found four or five rubber bands to form a long strip, which is about one and a half times as high as the book, and then bent them with wire.

A small hook to cover the open pages. Open books will never close automatically again. Close the book.

Later, I also knew which page I had read.

Sushanglai

A good way to flip the chart on the blackboard

In class, I saw some teachers flipping through the wall charts, which was very laborious and laborious. I am on the blackboard.

Made a simple wall chart.

Find two spools, one fixed on the upper right corner of the blackboard and the other fixed above the blackboard.

On the right side of the, nail two nails (custom position), one high and one low, and the nail below is the first to hang.

Point, the top nail is the second hanging point.

Take a string (or strong thread) about 2 meters long, tie a small iron hook at one end and tie a knot at the other end.

A piece of wood about 18 cm long, 5 cm wide and 0.5 cm thick, and the thread should be tied in the middle of the wood.

A clip is fixed at equal distance on both sides of the batten.

When in use, the rope is wound on two spools. Hang the hook at the second hanging point first, so that you can use the hook with clip.

Come down and clamp the picture to be hung. Then hang an iron hook at the first hanging point, and the students can clear it.

I can clearly see the picture hanging on the blackboard.

Wang Xiang, Xu Hai.

Line ruler on the blackboard

I am a scribe of the school blackboard newspaper. Every time a blackboard newspaper is published, the biggest headache is to draw lines and tick boxes.

I came up with a simple method of drawing lines.

Nail four small nails on the walls at the four corners of the blackboard, and wrap fine wire (or thick wire) around the nails.

Form a rectangle and connect the upper, lower, left and right lines with several white lines (as shown in the figure). Copy horizontally.

Sometimes, the connecting wires on the left and right iron wires are moved up and down; When copying vertically, iron both sides.

The connecting line on the silk moves left and right. If it is around the blackboard (or on the wire), it will be scratched symmetrically.

On the length (without affecting the appearance), the better.

After copying the blackboard newspaper, move the line up (or down), left (or right) to the end respectively.

For next use.

health

Simple marking ruler

Pupils can't write unless they type. But typing is troublesome and often irregular. If you enter the box,

It is even more troublesome.

The simple ruler I designed is shown in the picture. You can draw many lines at once, quickly and evenly.

You can also play diamonds, rectangles and Tian Zige, which is very convenient to use. The letter lattice is used for arranging pens.

When I saw my sister doing English exercises, she had to type her own mailbox. She compared it with a ruler and drew four.

Only four horizontal lines can form a letter grid. I thought of an idea for my sister: I found four ballpoint pens,

Wrap each one in a circle with tape, arrange it neatly, arrange it with a flat piece of bamboo or iron, and wrap it.

Stick three or four layers of adhesive tape to make a convenient combination pen. Typing with a combination pen is fast and accurate. When in use,

Changing the angle of holding the combination pen can also adjust the width of the grid.

Widening the pen spacing can also be used to make squares and squares; You can also use a combination of five refills to draw five lines.

Spectral lattice

Teng xiaonan

Homemade compasses

Find two used ballpoint pen cores (one of which can write), three broken saw blades and one.

Sewing machine needle, you can make your own small compass.

Put three pieces of broken saw blades on the grinding wheel and grind them into the shape shown on the left. Take a ballpoint pen core that can't write.

Bake with low fire, take out the copper head, insert it into the sewing machine needle and fix it.

On the right, insert two long steel saw blades into the tails of two ballpoint pens respectively. Finally, screw on three saw blades.

The round holes are fixed together. Don't fix them too hard. It is advisable to be able to pull flexibly without loosening.

Pull the short saw blade to it as a handle, and the long two saw blades are the two feet of the compass.

Fan jianjiang

Self-made "ellipse gauge"

Usually when drawing an ellipse, the two focuses of the ellipse are nailed with a nail, and the two sides of a line are together.

It's troublesome to wrap the end around the nail and then use the strokes. I made an ellipse gauge, which is easier to use.

Convenient.

Find two waste ballpoint pen cores, poke off the ball at the tip of the pen, and drill a small hole at the lower end of the pen core.

Take some thin iron sheets and make them into the "feet" and "heads" of the elliptical gauge according to the drawings. The foot is rolled into a cylinder and embedded in it.

Ballpoint pen core Fix it with screws.

Pass a smooth and strong thin thread about 50 cm long through the fine eye of the ballpoint pen core.

Go and draw it out of the hole at the end of the pen. Find two small clips and clip them on the oval feet. tie

The head is wrapped around the clip.

When drawing an ellipse, first set the focus F 1, F2 on the paper, and press the two feet of the ellipse gauge at the two focus points.

Point, according to the size of the ellipse, adjust the length of the thin line, tighten the thin line with a pen, and draw an ellipse.

If you draw an ellipse with a ballpoint pen, you can cut out a small piece of ballpoint pen to prevent the line from slipping out of the pen tip.

The core plastic pipe is sleeved on the pen tip.

Chen Dong

Make crayons with colored chalk

Once there was a power outage, I lit a red candle and did my homework by candlelight. I accidentally knocked over the candle.

After the wax oil spilled on the table, I picked up a piece of chalk and dipped it off like ink.

Wax oil poured on the table.

The next day, I accidentally drew a picture on paper with this piece of chalk dipped in red wax oil. Hey, the color is very bright.

Great, better than red crayons. I thought: Can you make crayons with chalk dipped in wax oil?

Boil the candle in an iron bowl and soak the chalk in wax oil. Try it again when it's cold. It's really good.

All right. But wax oil only soaked the surface of chalk. What should I do? Simply put, I put the chalk above 60 degrees.

Cook in wax oil until the chalk stops bubbling and the wax is soaked through.

Colored crayons are very easy to use. Compared with ordinary crayons, it has bright colors and even coating, so it is not easy to use.

Broken, low cost, easy to make and so on.

Zhang Wenkui

Ink delivery pipe

What should I do if I pour the ink from a big bottle into a small bottle without leaking a drop?

Take a cork (or rubber stopper) with the same diameter as the bottle mouth. Drill two holes in the plug.

Insert two thin plastic tubes (other thin tubes are also acceptable), one shorter and the other shorter.

Above the liquid level, one end is used for blowing; The other tube is longer, and one end is deeply inserted into the bottom of the ink.

One end is bent and extended to the bottle mouth as a water outlet pipe.

In this way, as long as the blowpipe is blown, the ink can be delivered to the small bottle through the outlet pipe, drop by drop.

It won't be wasted. Blowing pipe is better than outlet pipe, which saves labor and produces enough water.

Zhao laijun

Homemade measuring cups and funnels

Small measuring cups and funnels are often used in our science and technology group when doing experiments. If I had a small one too.

How beautiful the measuring cup funnel is! You can do small experiments at home.

One day, I saw a graduated plastic medicine bottle. Ah, its upper part is as small as upside down.

Funnel!

I cut the bottle with a knife, haha, the lower part is just a small measuring cup.

I found another cork, opened a hole in the middle, inserted a hard plastic pipe and put the cork in.

On the bottle mouth, a small funnel is more useful.

xiaowu chen

Square funnel

The lower end of the funnel is usually round. It is often used to hold water or other liquids.

Always lift the funnel so that there is a gap between the funnel and the bottle mouth. Otherwise, it will "poop-poop".

Bubbles, liquid flow slowly, even can't flow down.

If the lower end of the funnel is changed to a square (as shown in the figure), when the liquid is put into the bottle, the gas in the bottle

Will run out along the gap in the bottle mouth, not to mention the funnel.

Li Fang