When did nuts appear in China?

1945- 1967: In the embryonic stage of the industry, Chunyu is the earliest screw and nut factory in China. L968- 1983: The production technology has been formally formed. Chunyu and Samsung Hardware have made all kinds of fast screw and nut machines and peripheral equipment for domestic supply, and their productivity is even more powerful. 1979-65438+ 1998 Jinhe went to Chinese mainland to produce nuts, Samsung Hardware produced screws, and cooperated with Teflon to produce aerospace screws. History of machinery and thread development

In which country and year was the nut invented?

Now many things have to be fixed together with screws. Looking around the house, everything you can see with your eyes-from furniture to food processors-is connected with screws. Spiral objects were invented more than 2000 years ago, but they have been used to fix things for less than 500 years.

The first person to describe the spiral was the Greek scientist Archimedes (about 287 BC-2 BC12 BC). Archimedean spiral is a huge spiral in a wooden cylinder, which is used to lift water from one floor to another and irrigate fields.

Its real inventor may not be Archimedes himself. Maybe he just described something that already exists. Perhaps it was designed by craftsmen in ancient Egypt to use irrigation on both sides of the Luo Yi River.

Archimedean spiral was used to carry water in the whole ancient society, and no one considered changing it into a fixed part.

Right: archimedean spiral is widely used to carry water. For example, the Romans used it to drain water.

In the Middle Ages, carpenters used wooden nails or metal nails to connect furniture with wooden buildings. /kloc-In the 6th century, nail makers began to produce nails with spiral lines, which can connect things more firmly. This is a small step from this nail to the screw. At the end of 18, screws were widely used as fixing parts because a cheap manufacturing method had been found at that time.

Screwdrivers (screwdrivers) appear around London 1780. Carpenters have found that tightening screws with a screwdriver can fix things better than beating them with a hammer, especially when fine-grained screws are involved.

Although it is only a small fastener, the screw has not stopped improving. As early as the 3rd century AD, the Greek mathematician Archimedes invented the thread, but it was not until the 5th century AD/kloc-that the first screw appeared, and the inventor was unknown. /kloc-wooden screws have existed since 0/550, and screwdriver was not invented until 1774.

1936, Henry M. Philips applied for the patent of cross slotted head screw, which marked the great progress of screw basic technology. Different from the traditional slotted head screw, the edge of slotted head screw. This design makes the screwdriver center automatically and is not easy to slide down, so it is very popular.