The powder metering and automatic Batching system consists of an isobaric mixer, a weighing control system and a new delivery pump. The batching Feeder is installed under the powder bin, and its function is to provide powder with stable flow to the powder metering scale. The powder enters through the batching feeder, and the rotating speed of the batching feeder is adjusted according to the comparison result between the instantaneous flow measurement value and the set value, so that the instantaneous value always tracks the set value, thus realizing the measurement and control of the feeding amount. The metered powder enters the powder conveying pipeline through a new delivery pump.

Accord to that action of the rotation rate of the ingredients when the pow moves in a uniform rotating reference frame, a measuring disc is arranged in the measure disc, a plurality of measuring blades are radially arranged on the measuring disc, and the measuring disc rotates at a high speed under the drive of a motor spindle. The material to be measured falls to the center of the measuring disk, changes its flow direction through the distributing cone, is captured by the blade, and moves radially outward under the action of centrifugal force.

Negative-pressure dilute-phase pneumatic conveying system uses the gas pressure below 1kg/cm2, and adopts negative-pressure (four-feed type) to suck materials through the whole conveying line at a high speed, so this conveying mode is called low-pressure high-speed system, which has a high gas-material ratio.

Negative pressure dilute phase pneumatic conveying system adopts negative pressure Roots pump as power source, and the pipeline conveys low pressure and vacuum state, and the wind speed in the pipeline is about 10-35/ s, and the materials are in fog in the pipeline. There is an acceleration of about 10m/s at the beginning of the system, and a high speed of 30m/s at the end, so the airflow speed is high. The pressure at the initial end of the pipeline is basically close to atmospheric pressure, while the pressure at the end is generally between -0.01-0.06mpa.

When the negative-pressure dilute-phase pneumatic conveying system is started, the materials in the storage volume are quantitatively supplied by the rotary air-lock feed valve, and are accelerated after being mixed with the negative-pressure air flow generated by Roots vacuum pump in the pipeline. The solid-gas two-phase flow is used in the conveying pipe and lifted to the remote integrated filter separator, and the mixture of air flow and materials is forced to change its running track after entering the cyclone separator wall. Because the density of solid materials is much higher than that of gas, As a result, the material loses the speed of linear motion after entering the cylinder wall, and falls into the cone part of the cyclone separator under the action of gravity, and then is uniformly fed to the downstream production equipment through the rotary gas lock discharge valve at the cone part. The power source of the negative pressure dilute phase system adopts Roots vacuum pump, and the gas can be filtered atmosphere or dried and purified gas. All the above materials are transported in a fully enclosed way.

Characteristics of negative pressure dilute phase pneumatic conveying system;

1. The conveying vacuum pressure is lower than the ambient pressure, even if the pipeline is damaged, it will not cause steam pollution to the environment due to the leakage of this material;

2. The manufacturing and maintenance requirements of the equipment are low, and the operability of workers is strong: it can be transported for a long distance;

3. The conveying gas (usually air) is directly taken from the white atmosphere, and the temperature of the gas is the ambient temperature; Pipeline materials have a certain friction temperature rise;

4. The transportation is continuous or intermittent, with high wind speed in the pipeline and no material accumulation;

5, multi-point feeding and multi-point discharging can be realized;

6. The gas power source is generally vortex tea and roots vacuum poly, which has no direct contact with materials. Long service life;

7, strong adaptability to conveying materials, powder and granular materials can be conveyed smoothly; Especially suitable for self-adhesive materials;

8, the environmental pollution is small, but the requirements for dust removal area are high.

Basic parameters of negative pressure dilute phase pneumatic conveying system;

Air velocity: 10m's-35m/s,

Transport capacity: 2-8t/h,

Transport distance: 20-100m,

Conveying height: 10-30m,

Air source type: Roots vacuum pump.