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§Selection of Rotary Buffer
The rotating shaft is directly connected to the buffer shaft or inner hole, as shown in the following figure:
T=L/2×M×9.8（N.m）
L: Dimensions of the cover (m)
M: the weight of the cover (Kg)
The above calculation formula can obtain the torque generated by the lid's own gravity when the lid is about to be closed. Please use this torque to confirm the required torque. Torque adjustment can be achieved by changing the viscosity of the damping oil. (Note: If the structure has gears or levers, depending on the gear ratio or lever ratio, the torque selection method is also different. Assuming that the gear or lever ratio is 1:2, the torque required for the slow fall of the rotating body under the same conditions should also be 2 times.)
§Rotary damper cooperates with spring for motion buffering
As shown in Figure A below, the cover plate is rotated and opened due to the spring force, and the relationship curve between the spring force F, the load W of the cover plate, and the torque T of the preselected damper is shown in Figure B below:
T<F-W
W: Load torque of cover plate
The amount of torque that needs to be applied by a spring-loaded cover or other mechanism to the rotating shaft.
F: Spring output torque
The spring force is sufficient to support the load resistance of the cover plate or other mechanism.
T: Damper torque
In order to ensure that the cover plate or other rotating mechanism can rotate in place smoothly, the damper torque T should be slightly less than the difference between the output torque of the spring and the load torque of the cover plate.
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