Working principle of dump truck

It consists of a hopper and a walking underframe. The hopper is installed in the front of the tire underframe, and the materials in the hopper are dumped and discharged by gravity or hydraulic cylinder thrust. According to the different discharging directions, it can be divided into front discharging, rotary discharging, side discharging, high fulcrum discharging (the discharging height is certain) and lifting discharging (the discharging height can be changed at will).

In order to adapt to the uneven roads on the construction site, avoid the scattering of materials, ensure accurate, fast and labor-saving unloading in place, and have good off-road performance and strong climbing ability, it is required that the driving speed of dump trucks should not be too fast (generally, the maximum speed is below 20 km/h). Dumpers with front drive axle (above the hopper) and rear driver's seat are suitable for short-distance transportation of sand, stone, mortar, brick, concrete and other materials.

According to different construction requirements, at present, the dumper is developing in the direction of one machine with multiple functions, which can quickly replace various working devices such as lifting, dozing and loading, making it multifunctional and efficient.

When it comes to science and technology, people may first naturally think of things that seem out of reach, such as artificial earth satellites, manned spacecraft, atomic bombs and so on. She often gives people a feeling of aloof. In fact, with the rapid development of science and technology, science not only serves the cutting-edge science and technology, but also permeates our daily life more and more.

Technology and life have long been inseparable, and technology is everywhere.

During the summer vacation, I participated in the summer camp for young journalists in Beijing.

During the days when we were away from our parents, the teacher asked us to inform our parents about our activities every day.

When staying in a hotel in Beijing, it is extremely difficult to find a public telephone because people are different and can't walk around casually. IC phone cards prepared before leaving are often lost.

At this time, I will especially envy those "group friends" who have mobile phones, and I will deeply feel the convenience that mobile phones bring to people.

In China Science and Technology Museum, we saw the old hand-cranked telephone that can only be seen in TV and old movies, and we also learned how inconvenient it is for people to contact in the primitive way in the era when there is no telephone.

Every time I see the footage of party member risking his life to send messages and losing contact signals in the battle, I can't help thinking, if I had a mobile phone, wouldn't I have avoided these unnecessary sacrifices? From time to time, I will be more aware of the power of science. Science has not only changed the whole world, but also changed our lives. Science is all around us.

A few years ago, people called mobile phones "mobile phones" and pagers "BB machines". Making and owning them is something to show off. It seems that this is a symbol of money and status, and it is synonymous with "big money" and "fashion".

Today, with the rapid development of science, the telephone has spread to thousands of households. From white-collar workers in companies to ordinary vegetable farmers and even people who collect waste products, their dependence on it is increasing day by day.

It occupies an increasingly important position and becomes an important means of communication in people's life and work.

It is obvious to all, from fixed telephone to mobile phone, from single communication tool to color screen and video mobile phone, it makes people's life colorful.

Seeing this, you can't help sighing at the rapid development of science and technology.

As a new generation of middle school students, while enjoying our new life, we should set up lofty ideals and aspirations, love science, learn science well and create a new life from childhood.

Every student here probably has the same dream. When they grow up, they want to be scientists, produce more scientific research results and contribute to the construction of the motherland and human civilization.

This is a lofty goal.

In fact, we learn scientific knowledge not only to become scientists, but also to adapt to the ever-changing new life.

Therefore, from now on, we should cultivate a strong interest in learning, study science and technology knowledge hard, learn various cultural classes well, read more popular science books and actively participate in various scientific and technological activities.

There is no limit to human wisdom. No matter the Challenger explosion in the United States or the global computer virus upgrade, it will never stop the scientific and technological progress of mankind.

"Knowledge is power", Bacon's famous saying inspired many people who are eager for knowledge.

Now, let's use it to motivate ourselves, be a new generation that loves science, and write more brilliant poems for the future of our motherland! (2) Science and technology, as the name implies, is science and technology.

Everyone should be familiar with science and technology, because it is used and served by us and it is closely related to our lives.

It not only brings us spiritual pleasure, but also physical comfort.

In this rapidly developing society, science and technology represent a kind of spirit as well as a kind of strength. It represents an innovation and a civilization.

It is an important symbol to measure a country's comprehensive national strength, and science and technology occupy an important position in any field.

Science and technology are widely used, including military, biological and aerospace.

Technology has been integrated into life and enriched it.

In the street, at home, in the classroom and in the shop, technology has brought convenience to people.

It can be said that human beings created science and technology, and science and technology also created human beings. Human beings and technology are interdependent.

Our food, clothing, housing and transportation are inseparable from technology.

Let me take you into the wonderful life of science and technology.

Clothes make the man, and everyone needs clothes to dress himself.

Take a closer look at the clothes we wear. Acrylic, silk and pure cotton ... are slim, warm and healthy ... countless, which bring us warmth, comfort, health and happiness.

These clothes can't be made without technology. Let's say warm clothes can make you feel warm. In the cold winter, we don't have to wear thick down jackets and sweaters, but only a light and soft warm clothes can make us feel warm.

You see, isn't this the convenience brought by technology? Let's see what we eat. Now, we should pay attention to everything we eat, that is health! With the progress of society and the development of human beings, people's concept of food has also changed, not only pursuing delicious food, but also demanding healthy and nutritious food.

Nowadays, many people eat high-tech foods, such as protein powder, calcium tablets and dietary fiber. , are studied by scientific and technological personnel.

Today, we talk about a high-tech food: vegetable juice drink.

Vegetables are an important source of vitamins and minerals and the guarantee of life and health. In terms of nutrition and health care, vegetables can provide comprehensive nutrition and prevent or even treat nutritional deficiency.

However, because the taste of vegetables is not accepted by most people, scientists and technicians have improved vegetables and made a delicious vegetable juice drink, which has become an ideal future drink.

Let's take a look at the most common material for building houses-cement.

Cement is a brownish gray powder made of limestone and clay. When it is used, it becomes hard and abnormal when mixed with water.

In recent years, with the development of new technology, functional cement has been continuously developed.

There are many kinds, such as glass glue, light glue, rubber glue, sugar glue, color-changing glue and so on. ...

About 400 words (20 16) in the snowstorm, four "honest" migrant workers stood for several months, but they didn't get a penny. Each of them only ate two buns per meal, but looking at the materials left by the unpaid boss, they said: We won't damage anything here and we won't sell it. This is the principle of being a man! After working for two or three months, I didn't get a penny. There is no oil, and the honeycomb coal is almost burned out. Four migrant workers can only eat two buns per meal. What's more, the steamed stuffed bun shop in Wang Ying Village gave them 25 yuan money on credit and told them: If you don't pay the bill, you can't eat steamed stuffed buns on credit. Now, I searched all four people's pockets and put them on the table. It's only 6 yuan 650. The boss's unpaid wages disappeared on June 5438+ 10/7. Liu Xianfang, from Yueyang, Hunan, complained to the Labor Security Supervision Brigade in Wolong District, Nanyang City, Henan Province, saying that four of them worked in a foundry, but the boss disappeared after owing them 5780 yuan. On the morning of 10 18, law enforcement officers came to the factory. The factory is parked. Four workers in thin clothes stood shivering in the snow. According to reports, Liu Xianfang and other four people went to work in the factory on June 5, June 8 and June 25 last year, but the boss has not paid wages since June 5 last year. Not a penny has arrived. "1at noon on October 6, 65438+65438, the boss vowed to pay the workers the next day, but since then, no one has looked for it, and no one even answered the phone. Because the boss can't be found, the law enforcement officers of the labor inspection brigade can't serve legal documents and the law enforcement means can't be put into use. At present, law enforcement officers are actively seeking the help of relevant departments to solve this matter as soon as possible. Migrant workers stick to it. " Liu Xianfang said. Liu Xianfang once burned a "medium-bottle furnace" (melting iron scraps into molten iron) in an iron and steel factory in He Shili Street, Wolong Township, and earned a salary of 2,700 yuan a month. One day, the boss found Liu Xianfang and asked him to help him tide over the difficulties. It turns out that the boss opened a foundry on South Station Road. At that time, all the furnace workers in the factory went home to collect wheat, and no other furnace workers were invited. "Liu Xianfang said angrily. In fact, as long as Liu Xianfang imitates their "thinking", there is no way out-there are still some scrap iron that melts molten iron in the factory, which can probably sell for two or three thousand yuan; Semi-finished automobile pressure plates are neatly stacked there. If it is a waste product, it can sell for 9000 yuan, and if it is a semi-finished product, it can sell for 20 thousand yuan. In addition, there are 8 "Jiefang" brand dump trucks in the hospital. However, Liu Xianfang said that although he didn't get a penny, he should take good care of these materials. Liu Xianfang, a 47-year-old native of Yueyang, Hunan, has a very difficult family life. Therefore, his son Liu Min also works here. A total of * * * spent 60 thousand, spent all the savings at home, and owed more than 3000 yuan in debt. The youngest of these four people is Zhang Hailong, 30 years old, from Zhangjing Village, Zhuangyuan Township, Dengxian County, Nanyang, Henan Province. Zhang Hailong's father, who suffered from a stroke, is 76 years old and unable to work. He has a 1 1 month-old daughter, and his family depends on him for a living. Zhang Hailong is afraid to call home. "I don't know about them," Zhang Hailong said with his head down. Li Sanhai, a 50-year-old janitor in Huangji Town, Xiangyang, Hubei Province, came to the factory from1October 25th last year. Not only did he not get a penny, but he also borrowed 200 yuan from his boss while entertaining guests. Although he is penniless, these four migrant workers are serious. "

Since the industrial revolution, science and technology in various countries have been developing continuously, and people's lives have been getting better and better. At first, people entered the era of steam engine, and then the era of electrical appliances. Nowadays, household appliances can be seen everywhere ... What would our life be like without the participation of science and technology? People won't dress beautifully as they do now; People won't build high-rise buildings ... On the contrary, if there is no technology involved in our life, then our life will be as boring as that of the ape era! Now, our country is getting stronger and stronger, and science and technology are also developing day by day. Various new scientific and technological products have changed from generation to generation, and people's lives have become rich and colorful.

After countless experiments, Edison finally invented the electric light, so that people don't have to live at night like fluorescent lamps, and they can work normally at night like during the day ... Since Yuan Longping, the "father of rice", cultivated super rice by farmers, people no longer worry about food shortage ... Since the Wright brothers invented the airplane, people don't have to take a boat, take a car, let alone walk to far places, so they can.

In short, technology has changed everything! Without the development of science and technology, everything today is impossible! Technology influences the present, and technology creates the future!

There is an automatic identification system and an automatic metering device at the entrance of the garbage dump. An IC card is attached to the left side of the front window of the garbage truck. When the vehicle drives to the gate, the IC card can automatically sense the "swipe card" with the railing of the gate, and the railing will immediately rise.

One car and one card, radio frequency induction, traffic identification.

When vehicles pass by, the automatic weighing device installed on the ground can measure the weight of each vehicle immediately and accurately.

Carrying our car all the way with the team in front to the working surface at the bottom of the ditch.

The driver pressed the control button and crashed. As soon as the back door of the carriage opened, we were driven out rolling and crawling.

As the radio said, the landfill is very big.

Many mechanical vehicles finish their work. Bulldozers, dumpers, loaders, sprinklers and sprayers are busy at the bottom of the ditch, and the working surface is covered with all kinds of garbage from Xi 'an.

Here, no matter what kind of garbage can find its own kind.

Dumping-finishing and rolling-loess covering-unit shutdown, the whole process is like making sandwiches, layer by layer.

About 10 minutes, a bulldozer came slowly, ready to cover me and my garbage friends with loess.

This is our last home.

My father is a simple man and a very caring man. How's it going? Want to know him? Then let me introduce you.

His eyes are small, but bright. His father is tall and looks capable.

Dad is serious about everything and loves cleanliness.

At work, father is meticulous. He is an ordinary driver, and his father has been rated as advanced for several years.

His work is hard, but he never complains.

Dad can't come home on time from work, and he can't even eat lunch when he is busy. I can't help feeling sorry for these things.

At home, he is a good father and cares about my study and health.

I'm sick. He gave me medicine. Every time I recite the text from memory, as long as my father has time, he will check it for me.

He is a good worker, a good father and a good husband.

My mother's work is very busy. My father knows that she is very busy. He is in charge of all the housework. Every time his mother comes back, he is so gentle and considerate. He always cooks some good dishes when cooking. I envy my mother's favorite foods, such as fish and meat.

My father's cooking is delicious. He always washes the dishes clean.

He always keeps the house spotless as long as he is at home.

How's it going? Isn't it great? I really want to say: Dad, I really like you! ...

Please indicate the source? Working principle of dump truck