Eternal company specialize on the design and manufacturing heavy duty hydraulic cylinder used for hydraulic hoist .And Eternal has accumulated rich experience and knowledge on such hydraulic cylinder ,so many heavy duty hydraulic cylinders have been applied on many hydraulic hoist all over the world .
1. Hydraulic cylinder application range .
Hydraulic power station
Not only we could manufacture all kinds of heavy duty hydraulic cylinder on hydraulic hoist according to the drawing from customers, but also we could make a design according to customers’ requirements. If you require our engineer to make a design, please advise us the following specification:
Working condition and environment ,for example ,temperature ,working frequency
Pulling force ,and return stroke force
Pulling and return speed
Seal ring requirements .For example, brand, seal material etc .
Tube and piston rod raw material requirements
Piston rod surface treatment requirements, for example chromating film thickness, Surface hardness etc.
Painting and other spare parts requirements.
3. Manufacturing capability and cylinder size range
Cylinder bore diameter
Max lifting capability
4.Manufacturing and inspection
4.1.Cylinder tube size and choice
4.1.1 According to the cylinder pressure and inside diameter size ,different steel tube Would be chose .
1.ID ≤300mm , cold rolled precision seamless tube would be chose
2.300mm≤ID ≤500mm , hot rolled seamless tube would be chose
4.2.2 Piston rod chromating and surface hardness .
Eternal company ensure that every piece piston rod would be surface hardened before chromating , surface hardness is HRC55-60 , Chromating film thickness is 0.03-0.04mm if there is no other specific requirements .
4.3Seal ring and O ring
According to the customers’ requirements and working condition , eternal company would choose suitable seal ring kit , seal ring brand include :Parker , Merkel , NOK , Guangzhou Rubber institute , Taiwan brand etc . Eternal company would supply suitable seal solution for their customer so that hydraulic cylinder has more lifetime , easy maintenance and simple repairing .
4.4 Tube and flange welding
The welding on cylinder tube and flange would be Ultrasonic tested every time , the welding seam would be cleaned before machining .Eternal company ensure that every welding seam has no any leak during lifetime
4.5 Assembly and pressure test
Before hydraulic cylinder is assemblied , every spare parts would be measured and cleaned .After hydraulic cylinder is assemblied , pressure test would be carried out one By one , eternal company ensure that testing pressure is higher 30%-50% than working pressure , and pressure holding time 30-60 minutes is necessary . Every piece hydraulic cylinder must be tested completely without any leak .
4.6 Painting and storage .
After hydraulic cylinder pass through pressure test , painting is necessary .
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