The diaphragm pump dosing machine is a new dosing machine developed by our company that uses compressed gas as the driving force to regulate and transport various liquid drugs. This dosing machine is unique because of the novel design of its key component, the pulsating dosing metering pump. Compared with other similar equipment currently on the market, this dosing machine can be used for quantitative automatic addition and measurement of various types of liquid drugs. It is especially suitable for various types of corroded, granular, high viscosity, easily volatile, and flammable drugs. , poisonous liquid. This new dosing machine can replace the traditional solenoid valve type automatic dosing machine.

(1),Equipment composition and function

The dosing machine consists of a regulating host, a pulsating dosing metering pump, an air supply system and related accessories.

The regulating host is a column cabinet (or control cabinet), which is equipped with Siemens programmable controller, Schneider switching power supply, intermediate relay and other electrical components. A touch display screen is installed on the front of the cabinet (or the touch display screen is placed for easy use position), specific operations can be completed on the touch screen or remote computer. In terms of application, medicine can be added continuously, evenly and accurately. In terms of operation, it is also simple and easy to use, with a Chinese operation panel and dosage calibration. , statistical analysis, accumulation, data analysis, reports, alarm reminders and other sound function settings, and equipped with an open communication interface, which can be easily connected with the plant automatic control system.

The dosing machine host also has the ability to automatically accumulate the action frequency of the diaphragm and the action frequency of the electromagnetic reversing valve, and display it on the touch screen. When the accumulation exceeds the empirical life value (settable), the system will automatically send out a warning Reminder. Check the high and low liquid levels of the medicine storage tank, and there will be an automatic audible and visual alarm if the limit is exceeded.

The pump body of the pulsating dosing metering pump is made of PP plastic, with a built-in 4-fluorine one-way check valve. The diaphragm is made of F46 (Teflon), which is very resistant to acid, alkali and immersion in organic solutions. eclipse.

(2), Principle of dosage adjustment

The key component of the dosing machine is the pulsating dosing metering pump. The principle of the pulsating dosing metering pump is the same as that of the mechanical diaphragm metering pump. After the dosing metering pump is made, the stroke of the diaphragm is determined, and the diaphragm moves once The volume change in the pump chamber is certain, and the PLC automatically calculates the action frequency based on the required dosing amount, and then adjusts the action frequency of the pulsating dosing metering pump to adjust the flow rate.

The adjustment schematic diagram of the pulsating dosing metering pump is also similar to the pneumatic diaphragm pump, but the pneumatic diaphragm pumps currently on the market are based on adjusting the air supply.

The flow rate is adjusted by the pressure. When the pressure is too high, the frequency of the diaphragm's reciprocating action will be faster, and the flow rate of the pump will be greater. On the contrary, the flow rate will be smaller. In actual applications, there is no available conversion formula between pressure and flow rate. , so it is difficult to accurately adjust the flow rate according to the pressure. In addition, when pumping the same flow rate of liquid, the air consumption of the pneumatic diaphragm pump on the market far exceeds that of the new pulsating dosing metering pump, so its energy consumption is low.

(3),Application scope

Add mineral processing agents: xanthate, black drug, 2 oil, sodium silicate, starch, lime slurry, etc.

Add water treatment agents: polymer coagulants, water quality stabilizers, various alum liquids, etc.

Add various toxic, flammable, volatile liquids, strong acids, strong alkali, and strong corrosive liquids.

By adding various high temperature liquids, the temperature can reach up to 90 degrees Celsius.

(4), technical parameters

a, Power supply AC380V, 50Hz; Output power: Confirmed based on the number of dosing points and dosing amount. b, Suction lift: 3 meters; Lift: 30 meters.

c. Dosing amount: 1-32000ml\/minute\/point. Dosing metering pumps of different specifications can be prepared according to needs. For larger quantities, multiple pumps can be connected in parallel.

d. Driving air pressure: 0.3-0.7 MPa.

e. The control host has a power line communication interface (or ProfibusDP interface), which is conducive to docking with the automatic control system.

(5) Advantages and disadvantages compared with traditional solenoid valve dosing machines:

a. There is no need for a gap, and the medicine can be transferred directly to the high position, eliminating the need for a medicine lift pump and high space requirements.

b. The dosing machine has a self-priming function, which is flexible and simple to install. It can inhale medicine directly from the medicine storage tank without the need for a constant dosing box. c. The capacity of the dosing metering pump is fixed after it is made, and the pump number measurement method is highly accurate. , will not be affected by changes in liquid level and viscosity. And it can

When transporting liquids containing particulate matter, the pipeline is not easily blocked.

d. The pulsating dosing metering pump uses compressed gas as power and will not overheat, because exhaust is a process of expansion and heating. The temperature drops when the pneumatic pump is working, and no toxic gas is discharged. Pneumatic dosing metering pump It does not use electricity for power, so no sparks will be formed during operation. Good grounding can avoid the formation of static sparks, which has a very good security effect.

e. The components in contact with the agent are made of anti-corrosion materials and have high corrosion resistance.

f. It has a simple structure, few consumable parts, and low subsequent maintenance costs; it is small and easy to move, occupies a small area, does not require a foundation or elevated platform, and is easy and economical to install.

Disadvantages: The purchase cost is high, it requires compressed gas as power, and its energy consumption is higher than that of a solenoid valve dosing machine.

(7) Advantages compared with metering pumps

a. Directly execute the switch command output by the PLC (no frequency converter, stroke controller, etc.), simple control, low cost. b. There are no mechanical structural components, fewer faults, and low maintenance and operation costs.

The diaphragm and electromagnetic reversing valve of the pulsating dosing machine are consumable parts.

The service life frequency of a diaphragm is usually around 8 million to 20 million times, and the frequency of actions per minute for dosing flotation chemicals will not exceed 30 times. If calculated as 8 million times, each diaphragm can be used continuously for 180 days. ;If calculated as 20 million times, each diaphragm

Lasts for 472 days of use.

Electromagnetic reversing valve: The service life of the electromagnetic reversing valve is 10 million to 30 million times, and the maximum operating frequency is 5 times\/second.

Calculated based on 30 operations per minute, each solenoid reversing valve can be used continuously for 230-960 days.