Device and method for detecting sudden change in flow capacity of valves, and equipment for tobacco regain moisture

Abstract

The present invention relates to a device and method for detecting a sudden change in the flow capacity of a valve, and tobacco resurfacing equipment, wherein the method for detecting a sudden change in the flow capacity of a valve includes: detecting the opening degree X and the flow rate Y of the valve; calculating the flow capacity Z=Y of the valve / X; according to the current valve flow capacity Z REAL Compared with the average value Z of the valve flow capacity of the previous N tests AVER , to calculate the change rate of valve flow capacity P=│Z AVER -Z REAL │ / Z AVER , where Z AVER =(Z 1 +Z 2 +…+Z N ) / N, N≥1; compare the change rate P of the valve flow capacity with the set value, and adopt corresponding processing strategies according to the comparison results. The present invention can take corresponding measures when there is a sudden change in the rate of flow capacity change, which is convenient for the operator to know the flow capacity of the valve in real time, and solves the problem of uncontrollable flow caused by the valve's long-term use due to slow travel or leakage. Remind the operator to repair or replace the valve in time.

Description

technical field [0001] The invention relates to the technical field of cigarette processing control, in particular to a device and method for detecting a sudden change in the flow capacity of a valve, and a device for regaining moisture in tobacco. Background technique [0002] The loosening and moisture regaining process is an important process in the tobacco processing process. Tobacco leaves are sliced ​​in the upstream process to form tobacco sheets, and in the loosening and rehydration process, the tobacco sheets are loosened into tobacco leaves in the drum. The process has certain requirements on the temperature of the drum, and the temperature of the drum must fluctuate within a certain range. Specifically, the temperature of the drum can fluctuate within the tolerance range by controlling the amount of steam applied. [0003] In the prior art, the control of the steam volume is usually adjusted through the control valve, but in the long-term use process, the control...

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Problems solved by technology

[0003] In the prior art, the control of the steam volume is usually adjusted through the control valve, but in the long-term use process, the control valve will gradually age, and the stroke action will gradually appear unsmooth. At the same time, the corresponding valve opening will gradually increase until even if the valve opening reaches the maximum, it still cannot meet the steam flow requirement; moreover, the valve will still leak steam after long-term use. When the required steam flow is the same, The corresponding valve opening is reduced until, even though the valve opening has reached the minimum, there is still steam flow

After the above two phenomena occur, the valve needs to be repaired or replaced. However, the process of the sudden change of the flow capacity of the valve cannot be observed intuitively, so it is impossible to know the change of the flow capacity of the valve in time, which is not conducive to timely maintenance or replacement of the valve. , resulting in uncontrollable steam flow

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