What should I do if the screw is broken and I can't unscrew it?

Pad something on the screwdriver head, such as double-sided tape, non-woven fabric or paper, to increase friction and facilitate screwing out.

You can insert the pointed welding head into the nut, heat the metal screw to melt the plastic around the screw, clamp it with pointed pliers and gently pull it out.

Use a small electric drill to make a shallow hole in the middle of the pattern screw, then find an anti-thread tap to screw it in and unscrew it.

Burn the head of the screwdriver on the gas stove, then push it on the screw quickly, wait for about 5 seconds, and you can screw it out.

Knock the gong cap off with a drill. Use the principle of reverse thread to drill out the remaining screws.

Slip button: refers to the situation that the threads cannot be engaged and the threaded connection cannot be tightened due to excessive force or other reasons at the threaded connection.

Reasons for silk slippage:

The quality is too poor.

Excessive strength or prejudice.

Excessive wear and tear of equipment

Screw is a tool to tighten instruments and parts step by step by using the physical and mathematical principles of circular rotation and friction of the inclined plane of an object. Screw is a general term for fasteners. Screws are indispensable industrial necessities in daily life, such as tiny screws used in cameras, glasses, clocks and watches, electronic products, etc. Universal screws for TV sets, electrical products, musical instruments, furniture, etc. As for projects, buildings and bridges, large screws and nuts are used; Transportation equipment, airplanes, trams, cars, etc. There are both large and small screws. Screw plays an important role in industry. As long as there is industry on the earth, the role of screws will always be important. Screw is the same invention in people's production and life for thousands of years. According to the application field, it is the first invention of mankind.

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. The real inventor may not be Archimedes himself. Maybe he just described something that already exists. It may have been designed by craftsmen in ancient Egypt, using irrigation on both sides of the Nile.

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.

Around A.D. 1550, the earliest metal nuts and bolts as fasteners appeared in Europe, all of which were made by hand on simple wooden lathe.

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.

1797, Maudslay invented the all-metal precision screw lathe in London. The following year, Wilkinson made a nut and bolt making machine in America. Both machines can produce universal nuts and bolts. Screws are very popular as fixing parts because a cheap production method has been found at that time.

1836, 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. Universal nuts and bolts can connect metal parts together. Therefore, by the19th century, wood used for making machines and building houses can be replaced by metal bolts and nuts.

At present, the main function of screws is to connect two workpieces together and play a fastening role. General equipment will use screws, such as mobile phones, computers, cars, bicycles, and various machine tools. Almost all machines will use screws. Screws are indispensable industrial necessities in daily life, such as tiny screws used in cameras, glasses, clocks and watches, electronic products, etc. Universal screws for TV sets, electrical products, musical instruments, furniture, etc.