Newly installed door closers in use about a week to 10 days, should check all the screws, and tighten it again. Use manufacturer recommended by the hydraulic oil, should be used for cold area hydrauli...
At present, the mechanical spring processing equipment and processing production line in numerical control (NC) and computer control (CNC) the depth and breadth of development. But as the change of sp...
1, control the movement of the machine, such as the engine valve spring, control of clutch spring, etc.2, absorption of vibration and impact energy, such as buffer spring under the car, train carriage...
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