Case 2: Successful Application of Central Conveying System

A certain company in Nanyang, Henan Province is an emerging enterprise specialized in producing plastic bottles for medicine. Central Conveying System was employed in its newly built plant.

Technical Parameters

• Two production lines are designed: line A for producing bottle covers and line B for bottles.
• 12 machines for line A have processing capacity of 10kg/hr, and one material pipeline is reserved for three machines.
• 12 machines for line B have processing capacity of 25kg/hr, and one material pipeline is reserved for two machines.
• Materials are PP, PE, white master batch and regrind materials with proportion of 31%:61%:3%:5% accordingly. Dehumidifying and drying are not required.
• Suction pipeline is made of food-grade SUS304, and steel wire hose is made of food-grade PU.
• The workshop is 72-meter long and 16-meter wide. Margin of the machine is 3 meters and height of the suspended ceiling is 3.2 meters.
• Volumetric mixing is essential for PP+PE.
• Material shortage alarm device is installed on material storage tank.
• Weighing should be prior to conveying, and dosing device is equipped at the discharging port of the machine.
• Power supply of the user is 3￠400VAC/50Hz, and control voltage is 24VDC.

System Planning

• SHR of both lines share one air suction pipe and one material suction pipe. Pneumatic valve is equipped on each branch pipe, and pneumatic air backup valve is mounted at the end of the main material suction pipe.
• All machines adopt SHR-12U-S and SCH-24L with mixing device. Storage tank at the bottom of SGB employs SBU-S-V.
• Shut-off signal and pneumatic shut-off plate achieve coordinated control.
• As SGB works continuously, the pneumatic shut-off plate opens automatically after the shut-off valve of the storage tank closes. Materials in the weighing hopper fall into the dosing barrel when materials in it are fully discharged.
• 8 material storage tanks for lodging PP, PE, master batch and regrind materials of both line A and line B to supply materials for 2 SGB.
• 3 sets of SCVG and SCSF are adopted to serve SHR on both SGB and the injection molding machine (line A and line B) in the workshop.
• The manual ball valve and universal switch of SCVG combine to control two of the three SCVG to work. Both line A and line B can choose any two of the three for operation.

Central Conveying System brought automation to the workshop and improved productivity. The workshop became neat because materials were put together and dust was collected before handling.