How to Improve jogging performance with flow control valves?

How to Improve jogging performance with flow control valves?

If the concrete batching plant is designed with a big feed gates, how to improve the control ability. And how to operate the control system?

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If the concrete batching plant is designed with a big feed gates, how to improve the control ability. And how to operate the control system?

Listing some possible problems during concrete mixers operating
Big feed gates with large operating cylinders can open very quickly. When jogging at the end of the feed period, the objective is to release small bursts of material with each jog. Batching computers usually control the "open time" of the gate in steps of around 1/10 second; since it takes 1/10 to 2/10 second to start the gate moving, and it can be full open in 3/10 second, a setting of 2/10 may drop no material while a setting of 3/10 can drop 50lb/20kg - too much for accurate batching. The computer's automatic tuning can try to adjust the jog time but it will jump from 2/10 to 3/10 second and back again in succesive batches. This is futile and will result in lost time and tolerance errors.

How to solve the problem? And how to operate the control system?
The solution is to add a flow control valve in the opening direction only. When adjusted to a speed of 1 second (approximately) from closed to full open, the open time plus the size of the opening can be adjusted in small steps. Since the volume of material dropped in each jog is roughly proportional to the area under the curve (see diagram), the amount of each drop can be accurately controlled by the same 1/10 second steps. This allows the automatic tuning (assuming that your system has it) to easily adjust to the best setting.

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