Technical Support

Damper Selection Recommendations

A. The cover plate falls freely and slowly (the rotating shaft is directly connected with the buffer shaft or the inner hole, as shown in the following figure). The cover plate falls slowly from less than 90 to 0 horizontally. The torque force of the cover plate acting on the rotating shaft
is calculated as follows: T = L/2 ×M × 9.8(N.m)
L: the size of the cover (m)
M: the weight of the cover (Kg)

Recommended models: LF-36 series, LF-18E series, LF-33 series

Remarks: The above calculation formula can obtain the maximum torque generated by the weight of the cover when the cover is about to be closed. Please use this torque to confirm the final determination of the required torque. The adjustment of the torque can be achieved by changing the viscosity of the damping oil. (Note: If the structure has gears or levers, the torque selection method is different according to the gear ratio or lever ratio. 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.)

B. the motion buffer of the rotary damper with the spring (as shown in figure a below, the cover plate rotates and opens due to the spring force)

spring force f, cover plate load w, and the relationship curve of the preselected damper torque t as shown in figure B below

torsion calculation is as follows:

T<F-W
W: the cover plate load torque
requires the amount of torque that the spring supported cover plate or other mechanism acts on 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 be smoothly rotated in place, the damper torque T should be slightly less than the difference between the spring output torque and the cover plate load torque.