Case 1: Successful Application of Central Conveying System

Customer Information

A certain technology group in Shenzhen is one of the largest global manufacturers who are engaged in computer, telecommunication, consumer electronics and some other industries. It is also a comprehensive DMS (Design & Manufacture Services) enterprise.

As economy rebounds continually after the world wide financial crisis, this enterprise expanded production scale at the end of 2009 to compensate for the loss. To reform the current production line, it appended production facilities to achieve higher efficiency and lower costs. It purchased central conveying system from Shini in September of 2009.

Technical Parameters

• Materials are PET pellets in which virgin materials and materials with fiber account for 85% and 15% respectively.
• Drying temperature is 160~180℃; drying time is 6 hours and bulk density of the material is 0.85kg/L.
• There are totally 15 injection molding machines: for 7 of them the clamping force is 350T and the maximum processing capacity is 50kg/hr; for the rest 8 machines the clamping force is 250T and the maximum processing capacity is 18kg/hr.
• One material pipeline for one machine.
• Power supply of the user is 3￠400VAC/50Hz, and the control voltage is 24VDC.

System Planning

• 15 injection molding machines are projected in the workshop. 7 machines with clamping force of 350T constitute an area; 8 machines with clamping force of 250T constitute another area; the other is feeding area.
• As dehumidifying and drying is strictly required for PET, and the conveying distance is quite long, therefore the whole system is divided into three areas.
• One blower for each individual area.
• In feeding district, SCVG operates after that materials are fed in the storage tank by manpower. It vacuumizes as vacuum separating valve opens and pipeline is put through. At the same time, suction box with pneumatic valve at the bottom of the storage tank opens to discharge materials, and each SHR of the drying equipment begins to load materials. Once One SHR is full, it skips to the next one.
• In molding district, SCVG operates after PET with fiber is completely dried. It vacuumizes as vacuum separating valve opens and pipeline is put through. At the same time, suction box with pneumatic valve at the bottom of the storage tank opens to discharge materials, and each SHR-E of the drying equipment begins to load materials. Once one SHR-E is full, it skips to the next one.
• There are 15 injection molding machines and 5 dryers, so one SCCS (1 to 24) is used for central control.
• As PET virgin materials the customer uses contains 15% of fiber, some pipes in the system are likely to wear away and crack, and should be taken as consumables.

This central conveying system was delivered to customer after installation and debugging in October of 2009. The system projects central dehumidifying and drying of raw materials. Supported by massive dehumidifying and drying equipment, the central conveying system realized automated production and unmanned management over material conveying which offered neat workshop, convenient operation and higher production efficiency from which we won great reputation.