Talking about the spring type precision pressure gauge spring type precision pressure gauge is a kind of pressure measuring instrument widely used in various departments of the national economy. There are two types of indexing of the instrument indexing plate. One is a 300-division instrument, and the other is a meter that is directly indexed by a megapascal. Since the instrument is divided by the mega-segment in the spring, the spring is in the plum (three) when the sector-shaped gear limit is not adjusted, the function is the transmission. The transmission ratio of the system and the limit plate of the sector gear are adjusted at the same time. The function is an ideally adjusted precision pressure gauge. The function is only when the transmission ratio of the transmission system is adjusted. The function (A) should behave. If K,1, and y=0, then the indication value Py and the nominal value Px at this time should satisfy the relationship: (2) The relationship curve of the equation is as shown by L2. It can be seen from the figure that the curve is also passed through the seat. The original point, but a line that is not equal to 45 degrees from the horizontal axis.
The distance is also equal to a straight line of y, but the angle with the horizontal axis is not equal to 45 degrees. In the ideal case, the indication error is A1, then AlrPy-Px......(4)=(K-1)Px+y. For systemic errors.
The above analysis is carried out under ideal conditions. In practice, there will be other factors. The error A2A3 can be regarded as accidental error. Therefore, in the process of precision pressure gauge error adjustment under normal conditions, the indication error of each verification point is A. The purpose of A1 precision pressure gauge error adjustment is to eliminate or minimize its system error A1, so that its indication value meets its accuracy requirements. Through the above analysis, the adjustment process of the precision pressure gauge is shown as follows: 1. Re-install the movement, move the fan-shaped gear limit piece, place the pointer at zero point and then boost. The indication value Py at each verification point should satisfy the formula (8).
2. Adjust the sector gear limit piece so that the sector gear is limited to a certain starting position, so that y=c, place the pointer at zero point, boost, and the value Py at each calibration point satisfies the formula (6).
3. Change the position of the adjusting screw and adjust the transmission ratio of the transmission system so that k=1, that is, the indication value Py of each calibration point satisfies the formula (5).
Of course, the adjustment of the error of the spring type precision pressure gauge according to the megapascal division needs to be repeated and repeated, but the internal relationship between the indication error, the indication value and the nominal value of the instrument is clear. The adjustment of the precision pressure indication value error will be less detoured, and the effect of getting twice the result with half the effort. (Author: Qiqihar City Metrology Testing Institute).
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