Responsibility and improvement of the pressure gauge pointer falling of problem？

Responsibility and improvement of the pressure gauge pointer falling off problem?

The needle drop problem of the pressure gauge, whether it occurs before or during use, no matter what causes it, is the primary responsibility of the pressure gauge manufacturer. Therefore, as long as the pointer needle is firm when the pressure gauge is adjusted, in many cases No needle drop should occur under the pressure gauge.

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1. Improve the sense of responsibility of factory staff

If the needle drop problem occurs in individual pressure gauges, it is generally caused by the negligence of the factory's work. For example, after the pressure gauge is adjusted, the needle is forgotten.

22, find out the cause of the pressure gauge parts and components and the tooling

If a large number of pressure gauges have dropped needles, you should look for the cause of the components to be qualified, such as whether the taper of the core of the movement is qualified, whether the taper of the hole mill in the needle library of the pressure gauge is consistent with the taper of the central axis, and so on.

If the pressure gauge on the movement is reverse-mounted, the large plate of the pressure gauge is riveted to the pressure gauge joint. When the needle is nailed, the core plate has no back support and can't eat hard. This requires thinking of ways to improve tooling.

3, add a check on the strength of the needle of the pressure gauge

When necessary, the pressure gauge factory should add a check on the strength of the pressure gauge nails.

Some pressure gauge factories only check the strength of the needle by pulling the needle library upwards with their fingers to see if the pointer is pulled down as a basis for passing the inspection. Because each person's hand strength is different, as the number of inspections increases, the same person's hand strength will also be different, this inspection method is not very scientific.

Some pressure gauge factories in foreign countries use needle pullers to check the strength of the pressure gauge nails, so that it can be quantitative, and it is not affected by different personnel conditions and length of time. To check the strength of the pressure gauge pin, you should specify the number of spot checks, and the method of judgment, such as using a pressure gauge puller to check whether the pressure gauge pin is firm. When the needle puller is pulled to a force of 20N or 30N, the pressure gauge The pointer is judged as qualified if it is not pulled off.