Shulou(Shulou.com)11/24 Report--

When it comes to power tools, people will think of chainsaws, drills, cutters, etc., but they will also feel that they are far away from our ordinary people. These power tools should only be used by professional engineers. Even if they are bought a few times, they will be left idle. What is waiting for them is to be left in the corner, unable to use them many years later and finally discarded.

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But when we see in some videos or movies, foreign families will envy those tools, all kinds of tools are available, the key is that they also like to take the time to do all kinds of things.

With the development of the times and the change of ideas, both adults and children are beginning to like manual and DIY, and all kinds of power tools are slowly becoming indispensable items in some family life.

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Picture source: pixabay power tool is a kind of small tool which is powered by small motor or electromagnet and drives the working head through transmission. It has the characteristics of easy to carry, stronger function, easy to use and so on. It is widely used in various industries of society and brings great convenience to our production and life.

There are many kinds of power tools, among which electric hammers and percussion drills are the power tools we use more frequently. these products are so powerful that they are vulnerable to punching holes, whether concrete, ground or masonry walls.

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Photo Source: pixabay sometimes has this question: in ancient times, there was no electricity, and sometimes it was necessary to punch holes in wood, so how did you punch holes?

In China, smart and wise ancient people used two wooden sticks, the head of which was fitted with an iron cone, and a rope was made into a drill. By pulling the stick and making the rope drive the iron cone to rotate, it could punch a hole. This kind of drill can only drill holes in the wood. I don't know if it was developed by the principle of drilling wood to make fire.

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Until the end of the 19th century, the first electric drill was made in Germany. The shell was made of iron and powered by direct current. It could punch holes in the iron plate, but weighed 14 kilograms.

Electric tools driven by electric motors appeared in 1914.

After man first landed on the moon in 1971, he drilled a hole in the moon for the first time.

With the development of battery technology, especially the breakthrough of lithium battery technology, high-power power tools also begin to use wireless batteries, and wired power tools will gradually be replaced by wireless power tools.

Percussion drills, electric drills and hammers are all used to punch holes. What is the difference between them and what is the working principle?

Electric drill: it is a drilling tool powered by electricity, and it is the most widely used product in power tools. it can work in a narrow space, the switch can control the positive rotation of the chuck, and the electric drill only has rotating energy, that is, it can only be drilled, so it can only be drilled on objects with low density or low hardness, such as wood, plastic or some metal, and it can be used as a screwdriver with low speed. At present, many practical functions have been developed by people.

The working principle of the electric drill is that the small capacity motor drives the connecting rod drive, and the connecting rod drives the gear to increase the power of the bit, so that the bit scrapes the object surface and finally penetrates the object, that is, the drive gear is driven by the motor to increase the rotational force of the drill. it allows the bit to drill through the object easily.

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The drill chuck is an important part of the electric drill, and the drill bits of different specifications can be easily held by three grippers. The thread on the clamp is meshed with the thread on the jacket, and the clamp can be stretched along the inclined plane by rotating the clamp. Open or clamp the bit, clamp the bit and clip the bit in the middle of the claw before drilling, so as to prevent the bit from falling off in the process of drilling.

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Percussion drill: the percussion drill is drilled by driving the bit through the transmission mechanism, and its impact and rotation modes can be switched. Depending on the axial movement of the two raised gear disks, the gears will jump, resulting in a continuous impact force. Because the bulge of the two gear disks is not very high, the impact force is not great. Impact drill is mainly used for drilling holes in walls, metal, wood and concrete, but the effect is not very good. The depth of the hole is not as deep as the electric hammer.

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Electric hammer: it is a power tool that can rotate and impact. Through piston reciprocating movement, compressed air in the cylinder is punched against the tail of the bit. The impact force of the electric hammer is not too great, and the impact force is much greater than that of the bit, but the vibration is relatively large. It is mainly used for drilling holes in concrete and natural stone, and can also be used for the removal of floors and walls, but not on metal.

The working principle of the electric hammer is that when the transmission mechanism drives the bit to rotate, there is also a reciprocating hammering movement perpendicular to the rotating head, the motor drives the gear or chain, and the gear and chain drive the eccentric shaft, which is driven by the connecting rod. The piston reciprocates in the cylinder, the impact hammer strikes constantly, the transmission mechanism drives the piston to reciprocate compressed air in the cylinder, and the air pressure in the cylinder changes periodically. Drive the hammer in the cylinder to hit the top of the bit back and forth, just like we take a hammer to hit a nail.

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There is also a kind of rotary drilling, just like an electric drill, the motor drives the gear drive, the gear drives the connecting rod and the bit rotational cutting and drilling, and when converted to the hammering mode, the hammering module jumps on the inner shaft, drives the piston to reciprocate in the cylinder, and pushes the hammerhead to hit the tail end of the bit with a higher impact force, making the bit strike forward. This force is greater than the impact drill, but less than the electric hammer, as for its name, some people call it the impact drill, others call the electric hammer, in fact, it belongs to the light electric hammer.

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As people use power tools as common equipment in production and life, such as electric drills, hammers, impact drills and other tools, electric tools that can improve work efficiency will play an important role in economic development. in recent years, power tools have also been included in the category of advanced equipment manufacturing industry, with the development of electronic technology, motor technology, battery technology, will usher in new development.

This article comes from the official account of Wechat: manufacturing principle (ID:zhizaoyuanli), author: manufacturing principle

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