Stuck stitches and skipped stitches
The pointer of the pressure gauge sometimes jumps or is sluggish. The reasons for this may be: friction between the pointer and the watch glass or scale; the central gear shaft is bent; the two gears mesh with dirt; the connecting rod and the sector gear The movable screw in the middle is not flexible. When encountering this situation, check whether there are stains inside the pressure gauge, avoid and solve the problem of stuck needles and skipped needles by eliminating the influence of materials. At the same time, check the cleanliness of the pressure gauge frequently to prevent small debris from affecting the accuracy of the value Sex.
2. The pointer shifts when tapping
In the process of verifying the pressure gauge, tapping will cause the pressure gauge pointer to move but unable to return. This situation will affect the accuracy of the value and affect the efficiency of the verification. When the pressure of the pressure gauge does not exist, the pointer cannot point to zero. The reasons for this situation may be: the pointer is bent; the balance spring force is insufficient; the pointer is not strong enough; there is resistance between the transmission gears. The reason why the pointer cannot point to the maximum scale: the transmission ratio is small; the movement is not fixed in the frame position; the spring tube welding position is improper. You can check whether the internal parts of the pressure gauge are intact, and check whether the pressure gauge is loose or there is friction to solve this problem.
3. No indication or large jitter
When the pressure gauge does not indicate the value, this situation may be caused by the following reasons: the shut-off valve on the pressure guiding tube has not been opened; the pressure guiding tube is not smooth; there is a blockage in the spring tube joint; the spring tube is cracked. At this time, you can check the pressure guiding tube, clean up the spring stains, replace damaged parts and other methods to avoid. When the pressure gauge pointer vibrates greatly, this situation may be caused by the following reasons: The detected medium pressure is large; the installation place of the pressure gauge is affected by external force. In this case, it is necessary to reduce the true range around the press.
4. The instructions are different in speed
This phenomenon occurs because there are some errors. You can change the angle between the connecting rod and the sector teeth, or turn the movement clockwise to change the pressure gauge pointer to indicate different conditions.
5. The error to be inspected increases or decreases proportionally
This situation is mostly caused by the transmission ratio of the pressure gauge, which can be solved by adjusting the screws around the value.
