1. Spiral waterproof watch. The top case and back cover of its watch case have threads, and the top case and back cover are tightly screwed together by the threads. The watch glass is rolled up with a tool and is relatively waterproof. Waterproof seals (mainly nitrile rubber) are placed in the winder handle and where the back cover and upper case are screwed together, so that they can play some waterproofing role. Some of these waterproof watches feature notches on the outside of the back cover of the watch case, and others feature polygonal raised parts. The corresponding tools must be used to open and close the rear cover.
2. Waterproof clip-on watch. There is a circle of high and convex openings inside the back shell, so that the upper case and the back shell can be closelyattached together. The watch glass and the spiral waterproof watch are also wound with tools, which is relatively tight. Waterproof seals are also placed inside the winding crown and where the top case contacts the back cover. To open the back cover of this type of waterproof watch, use a knife to pry it up, and to close the back cover, you can also press it with a rolling tool or push it with your fingers.
3. Waterproof sleeve type watch. Its upper case is pressed against the lower cover. The shape of the bottom of this type of watch case is quite special: there is a higher wall around it, the movement is installed inside the back wall, the watch glass is directly installed on the wall of the watch case. bottom, and the upper case is pressed, the watch glass and the back cover are tightly covered, ensuringt thus sealing and sealing. The winding stem is connected by the upper and lower sections. When opening and closing the back cover, first remove the winding stem and the upper part of the winding stem, then use a special rolling tool to open and tighten it. There is no special rolling tool, just press and push with your fingers.
How to choose a mechanical watch
As a precision mechanical timekeeping instrument and decorative object, mechanical watches should be both practical and decorative. High-quality watches are accurate, easy to use, finely crafted and beautiful in appearance. They can work continuously for over 36 hours when fully wound and are also durable. Some watches are also waterproof, shock-resistant and anti-magnetic.
Counterfeit and quality watchesLower ity are usually sold through abnormal channels. Its characteristics are as follows: using beautiful appearance as bait, but the internal machine adopts poor quality plastic movement, "rough horse" watch movement with rough production process, poor processing precision, and movement of poor assembly quality, pretending to be a domestic or imported famous watch. When sold, its travel time error is large and its service life is short.
It takes some experience to identify counterfeit watches, and it is difficult for ordinary consumers to identify their authenticity. In order to avoid purchasing counterfeit watches, consumers should carefully identify brands when purchasing, especially famous brands with distinctive characteristics. Authenticity can also be distinguished on the basis of structuresfeatures of some models (such as winder handle sealing device, calendar adjustment device, back cover screw-in structure, etc.). You should try to choose models with better quality and repair parts (domestic models such as Z1, Z, KLC, LSS series, imported models such as ETA2750, ETA2851 series, 371 series, 2660 series, etc.).
When purchasing mechanical watches, you should pay attention to the following points:
1. Visual inspection of the shell, surface and needle shows that there is no "trachoma" or scratches, the coating is shiny, there is no difference in color and the back cover must be screwed on tightly.
2. Starting performance. Slowly rotate the winding handle to wind the mainspring while observing the second hand. Generally, the fewer winding turns it takes to start the second hand, mThe better is the start-up performance of the watch.
3.Article 1. It is pleasant to hold in the hand when reassembling and there is no noise. With the exception of automatic watches which slip after being wound sufficiently, watch springs in general should be able to be wound sufficiently without slipping.
4. Dial the needle. The hand feels comfortable when dialing the needle, and it is not good if it is too tight or too loose. The hour and minute hand indications must be coordinated (when the hour hand is aligned with the characters 3, 6, 9 and 12 respectively, the minute hand must not deviate from the 12 characters ± 4 minutes ), and the hour, minute, and second hands must not rub against each other.
5. Pronunciation. Once the watch is fully wound, listen to the sound of the watch with your ears. It must be clear, uniform and free from noise, and nIt should not change with changes in direction.
6. Travel time accuracy. It must be measured with special instruments. Some large public stores offer testing services to customers. When purchasing, you can ask the seller to test the travel time accuracy and position error.
How to maintain a mechanical watch
1. It is best to wind the movement at a set time each day and wind it enough at a time. The winding speed of the watch handle should be appropriate and do not wind it too hard. If it is too tight, the spring will be easily trapped by the oil in the barrel. When the spring is relaxed, it breaks easily due to excessive elasticity.
2. The watch must avoid violent vibrations. It's best to take it off when playing ball or hitting something with your hands. The watch is also afraid of immersion in the eAt. Therefore, it is best to take off the watch when washing clothes, washing hands or doing any other work that comes into contact with water. If fog or water stains appear on the watch glass, the watch glass should be repaired in time, the fog and water stains should be wiped off, and the movement should be dried. But if there is only a little fog, it will disappear on its own once the climate dries.
3. Do not open the watch cover at will to avoid dust falling inside; if it is broken, send it to the watch workshop for repair.
4. When you are not wearing the watch, do not place it on the radio to avoid being magnetized by the speaker magnet and affecting the travel time. Watches should not be stored with camphor, as camphor is an extremely volatile substance that can easily solidify engine oil and lose its effect.lubricant, thereby damaging the accuracy of the watch.
5. The hardness of the watch glass is not high, so you should avoid rubbing it with hard and sharp objects, and avoid being corroded by high pressure, high heat and chemical reagents to avoid scratches or the damage. If there are slight scratches, you can apply toothpaste on the velvet cloth and rub it back and forth on the watch glass to remove the scratches. Remember not to wipe with alcohol to avoid the watch glass from chemically interacting with the alcohol and breaking.
How to demagnetize a watch
Although antimagnetic watches have some antimagnetic effect, when worn, if they come into contact with objects such as generators and motors With strong magnetic fields, the watch may be accidentally damaged. When placed nearoximity of radios and televisions, the watch will be magnetized by the magnetic fields of generators, motors, radios and televisions. Once the watch is magnetized, not only will the time be inaccurate, but some may even stop. So, how do you demagnetize a watch? It is better to send it to a watch repair service for demagnetization, because there are special equipment for demagnetization. If it is not practical to repair it far from the watch workshop, you can find a piece. iron with a circle shape in the middle and is not magnetized. Place it upright on the table and slowly pass the watch through the circle of iron blocks. The magnetism will be absorbed by the iron block; you can also place the watch on a clean, non-magnetic iron plate, so that the magnetism of the watch will gradually disappear after two days.
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