Wuhan Handern Material Transportation and Measurement
DATE：2020/8/26 8:42:06 / READ： / SOURCE：This station
Wuhan Handern Material Transportation and Measurement
In the process of matching PVC compound materials, the focus should be on the transportation and metering of trees. The second is the automated delivery of plasticizers. The transportation of powdery PVC resin can be carried out by means of machine city transportation methods such as containers, tank trucks and other bulk transportation results, such as lifts and screw conveyors. But currently, pneumatic conveying systems are mostly used. www.handern.com Non-woven equipment
The pneumatic conveying of materials generally uses air as the power source, with a high speed and most advantages of mechanical conveying, but is limited by the size of the material. Bulk, lumpy, and cake-like materials cannot be used.
(1) Classification of pneumatic conveying system According to pressure:
①The positive pressure system can transport materials from one place to other places or high places.
②Negative pressure system is specially designed to transfer materials from several reclaiming points to a specific feeding point.
③Positive pressure-negative pressure combined system The operator can flexibly use multiple sampling points and feeding points.
The pneumatic conveying system of PVC resin is operated by a negative pressure power unit. It sucks PVC resin out of pneumatic railcars or large storage bins, and the material is sucked to the filter collector, where it is separated from the airflow. The material coming out of the filter collector falls into either of the two pre-developed blasts due to gravity. When the first is full, the automatic level indicator will rise to the second slot. The full blast groove closes the top and opens the bottom. The air introduced at the top causes the material to be under slight pressure, and is transported to the storage bin through the positive pressure airflow.
(2) Storage tank shaker The resin or material stored in the storage bin with a conical bottom (powder taper 60-70°, pellet taper 45) is placed in a feeder, weighing apparatus or measuring device by gravity. The screw-type vibrator installed in the cabinet can prevent materials from being clamped, bridged or compacted at the bottom of the warehouse, creating necessary conditions for the continuous mixing process.
(3) Storage and transportation of liquid materials The storage and transportation of liquid plasticizers in barrels are very inconvenient. They are generally transported by tank trucks, large storage tanks, and gear pump pipelines.
(4) Measurement Accurate measurement is a prerequisite for ensuring product quality. The measurement method of kneaded material can be divided into weight measurement and volume. In production, lever scales or electronic scales are commonly used for accurate weight measurement.
(5) Bulk mixing and batching methods for extenders and stabilizers, etc. Small-scale PVC production can be achieved by a pot-by-pot batching method combining manual and semi-mechanical. For example, the booster is transported to various storages by pumps in varieties, and then weighed pot by pot according to the formula and then sent to the machine tank for standby. Stabilizer, coloring agent and other powder additives are commonly used in a certain amount of extender after three-roll milling into a table shape, then hand-made batch by pot and then sent to the kneading pot. This method of dispersing ingredients has simple equipment and low investment, but it is not suitable for large-scale production. The main problems are ① large batching error; ② not easy to disperse uniformly ③ many procedures, complicated operation and high labor intensity. www.handern.com Non-woven equipment
For products with a large output such as calendered film, the way to eliminate the disadvantages of dispersed ingredients is to use a large mixer of plasticizers and stabilizers.
Large mixing is to prepare various plasticizers and stabilizers, colorants, fillers and other additives according to the output formula of kneading a single pot. After being dispersed and finely mixed in the container, it is transported to the storage tank for weighing. For multi-variety production, in order to facilitate cleaning, generally only natural or white materials are mixed, and other color materials are added in the kneading operation. www.handern.com Non-woven equipment
Author：admin