(1) flow rate adjustment Metering pump flow adjustment should be able to run and stop can be carried out. Commonly used flow adjustment methods have to adjust the length of the trip, change the empty trip, hydraulic oil bypass and variable speed regulation. â‘ Adjustment stroke length As shown in Figure 2-68, adjust the screw pump and screw drive eccentric mechanism during pump operation to change the crank radius so as to adjust the stroke length. Common methods are N-type crankshaft adjustment, chute shaft adjustment and change the angle of the worm gear. Typical manufacturers using N-type crankshaft adjustment are Chongqing Pump Factory Co., Ltd. and most of the domestic manufacturers, Japan Nikkis0 companies; the use of inclined shaft adjustment is a typical manufacturer LEWA company in Germany; to change the typical angle of the worm gear manufacturers is Hansheng Industry (Milton Roy, USA). â‘¡ Change the empty travel As shown in Figure 2-69, the cam spring adjustment mechanism uses an adjustable stop so that the crosshead does not move with the cam during part of the travel, thus shortening the effective length of stroke and changing the flow. Typical manufacturers to change the empty travel adjustment are the United States Idex company (Pulsafeeder), Germany Prominent company. â‘¢ Hydraulic Oil Bypass As shown in Figure 2-70, by bypassing the hydraulic oil, the amount of oil in the hydraulic oil chamber changes to change the effective stroke of the plunger. Hydraulic oil bypass adjustment method can be used for smaller power metering pumps, the advantage of the adjustment mechanism is very simple, small size, compact structure, and the temperature caused by the volume of hydraulic oil will not affect the measurement accuracy, but the next Road control spools, plungers and other machining accuracy requirements. There are manufacturers of hydraulic oil bypass control models Hansheng Industrial (Milton ROy company) and so on. To improve process flexibility or increase the flow adjustment range, and sometimes combined with two kinds of adjustment methods. Such as a large sewage and pool dosing device, the dosing pump with both variable speed regulation, and stroke length adjustment. Adjust the pump speed according to the change of sewage volume; adjust the stroke length according to the pH value of neutralization pond sewage. (2) Automatic adjustment during operation If required by the purchaser, the metering pump shall be equipped with an electric control or pneumatic control unit and be capable of remote operation. Electric control is to change the electrical signal to achieve the purpose of automatic adjustment of the trip; pneumatic control by changing the pressure signal to achieve automatic adjustment of the purpose of the trip.
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