/ep_edm/en/contect_521.html SHINI PLASTICS TECHNOLOGIES, INC.

Experience Sharing

2011 Quarter 3 Issue 8

Successful Application of Central Conveying System

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There is a Technology Group in Shenzhen specialized in computer, communication and consumer electronics. It is one of the high-tech corporations and the largest manufacturers around the world.


One department of injection molding under the business division has newly added equipments, thus they decided to adopt central conveying instead of single loaders to achieve high efficiency and reduce cost. In September, 2010, they purchased central conveying system from Shini.


System Schematic Diagram (B1, B2 Area)


Technical parameters

Material varieties: ABS virgin material

Material handling: drying is necessary, bulk density is 0.65kg/L. Number of injection molding machine: 67, each output is 25kg/L and total amount is 1675kg/L.

Pipeline: one molding machine with one material pipe, air suction straight pipe, elbow pipe and straight pipe elbow adopts 201# stainless steel.


Planning description

There are 67 molding machines altogether and seven sectors, each sector with output from 225 to 275kg/hr. One blower in each sector, which means that one major air pipe is adopted, and three 1 for 24” central control stations are used for central controlling. There are 67 storage hoppers in material warehouse for feeding. Storage hoppers are placed in first floor and serve for 67 SCD all-in-one devices, which are placed in second floor. Material feeding is fulfilled via single device loading function within SCD and dried material from SCD will be conveyed to molding machine hopper via stainless steel pipes. In material feeding area, firstly material is manually feed into storage hopper, then SCD will absorb material via single device loading. After that, SCD will dry material absorbed into drying hopper. In molding area, after ABS material has been dried, central vacuum generator starts to run and vacuum separate valve opens, then vacuum pumping begins with pipeline connection. Meanwhile, pneumatic shut-off suction box at bottom of SCD will open and material starts to discharge. Photo-sensors hopper of all molding machine starts to load material, when one photo-sensor hopper finishes loading, system will shift to next photo-sensor hopper for loading.


The central conveying system has been completed and put into service in November, 2010. The introduction of system realizes the automation of molding workshop and promotes production efficiency, as well as reduces costs. Equipments like hopper and dryer are placed in material warehouse to make workshop compact and in an array.