Central Conveying System Application

A company located in Shanghai is one leading producer and supplier of cable water joint, hose and connectors both at home and abroad. In 2012, the company moves into its new factory. To improve its management and create its new image, the company introduces Shini’s central conveying system.

According to the parameters provided by the customer and the needs survey, as well as the on site inspection, finally Shini came up with a system solution---a central conveying system which integrates drying and dehumidifying, dosing and mixing handling system with granulating and recycling system.

Site general situation:

1. 28 injection molding machines, 11 extruding machines;

2. 10 kinds of materials which all need to be dried; extruder used materials need to be dosed and weighed, then blended and mixed, and at last granulated and recycled.

3.  Feeding area is located at one end of the extruders; conveying distances is horizontally 90m in length and 30m in width.

Central conveying system description:

On the basis of the customer requirements and the real situation, the whole system is divided into four areas: one injection molding machine area, one extruding machine area and two feeding areas. Each area can convey materials simultaneously without affecting others.

1. The whole system uses two customized 1-32 control cabinets to control injection molding machine area and extruding machine area respectively.

2. There are nine central vacuum regulators (one for backup) among which two are for injection molding machine area, three for extruding machine area and other three for feeding area, the last one for backup.

3. Considering the site restrictions, the pipelines adopt one machine equipped with one pipeline totals to 2 layers material pipes and each layer material pipe is feeding one molding machine controlled by central vacuum generator.

Design Sketch privided by Shini:

Working flow of injection molding machine:

Four kinds of materials are conveyed to the hopper dryer by negative pressure provided by central vacuum generator; after drying, they will be conveyed directly to the injection molding machines through a distributor.

Working flow of extruding machine:

1.  Materials in the ten storage tanks are conveyed partly to mixers, partly to gravimetric blenders and partly to the dryer.

2. The four mixers are all equipped with proportional valve (often used with regrinds) through which materials can be proportional mixed and the material mixture will be conveyed to the dryer through the pipelines.

3. With an accuracy of 1%, the three gravimetric blenders are used to weigh the material and after which the material will be conveyed to the dryer through a suction box.

4. All the materials from the dryers will be directly conveyed to the molding machines after dryers.

The system is provided on the demand of the customer. With scientific distribution and flexible and accurate dosing, all the machines can freely choose the materials. What’s more, the system features a reasonable and elegant layout which definitely meets the requirements of creating a new image.