Application example of mass flow meter

Application example of mass flowmeter--in liquid filling line 1. In the chemical and food industries, the filling of barreled liquid is very common. For the medium and above filling volume (above 10Kg), the filling method generally adopts electronic weighing type And flowmeter type, among which the electronic weighing method has been widely used in China. Due to the development of flowmeter technology, especially the successful experience of using mass flowmeter measurement in recent years, we believe that high-precision filling with medium capacity and above should adopt The mass flow meter measurement is more reasonable, and the design is as follows: 2. Overview of the filling production line 2.1 Material characteristics and process conditions 1) Filling material temperature: 5~35°C 2) Material density: organic acid about 1.2g/cm3, organic acid salt About 1.3g/cm3 3) Material viscosity: about 50CP for organic acid, about 150CP for organic acid salt 4) Inlet pressure of feed pipe: 0.2Mpa, fluctuation range 10% 5) The whole set of equipment meets the hygienic requirements of GMP Filling capacity: 25L (square barrel); 200L (round barrel); 1000L (IBC barrel) Filling accuracy: (mass accuracy): 0.1%, filling accuracy meets European OIMLR61-11996issue standard Filling speed: 25L barrel (30Kg): 6 barrels/minute; 200L barrel (250Kg): 1 barrel/min; 1000L barrel (1200Kg): 1 barrel/4 minutes 2.2 Process flow Empty barrel sorting Empty barrel enters filling station Detection and positioning Filling head down Filling valve opens and starts filling quality measurement When it reaches 90% (set value - compensation value), the throttling of the regulating valve becomes smaller and reaches (set value - compensation value), the filling valve is closed, the vacuum absorbs the full barrel, leaves the filling station and turns to the hanging cap [Industrial Electric Network - cnelc] to rotate 2.3 Filling system overview The whole filling system consists of mass flow meter, control valve, filling head, bracket, guide rail, pneumatic actuator, control system, etc. (1) Filling system precision filling The system accuracy mainly depends on the accuracy of the mass flow meter, the filling speed and the stability of the system. (2) The actual filling volume must be greater than the set flow rate of the vortex flowmeter during over-flow control filling. It must be set through the PLC program, and the flowmeter is required to send a signal in advance to control the closing of the filling valve, so as to ensure the actual filling. The loading volume is consistent with the set volume of the mass flow meter. (3) Flow control (filling speed control) In order to ensure the accuracy of the filling system, the filling speed of the filling system is designed as fast and slow, and the flow control valve automatically controls the filling speed by controlling the flow. Since the opening of the control valve will not affect the filling accuracy, using the automatic regulating valve currently on the market is expensive, bulky and inconvenient to install and requires increased control requirements, so the flow control valve adopts a self-designed three-position butterfly valve. That is, large opening (*open), 1/3 opening (can be manually set and adjusted), *close, its superiority is outstanding, and its performance is stable. (4) After the anti-drip filling is completed, it takes a certain period of time for the viscous material remaining on the surface of the filling head to flow out, so that the material will drip onto the surface of the container and cause pollution. The filling system is designed to use a vacuum generator to suck back The system ensures no drips. The vacuum generator has large suction flow, simple structure, low cost, quick vacuum generation and release, and convenient installation and maintenance. (5) Filling head The filling valve of the filling head adopts a self-designed pneumatic stop valve, which has a simple structure, quick opening and closing, easy cleaning, and good sealing. The fluorine rubber seal meets food grade.

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