The gas spring mainly tests the mechanical properties such as tensile strength, tensile strength, stretching force, tensile strength and elastic force. How to determine the upper and lower mounting points of the gas spring under the introduction of Zhongchuang Xiaobian:
The total length of the gas spring, the working stroke is determined during the determination of the upper and lower mounting points. Determining the upper and lower mounting points of the gas spring is a difficult point for the entire gas spring installation design. The following uses a single-axis hinged door as an example to illustrate the application of the two-circle method in gas spring installation design. The installation diagram and related parameters are shown in Figure 2. The calculation below is based on the principle of the door body and the homogeneous ideal model (center of gravity = geometric center). During the door opening process, the moment of the hinge O changes continuously, and there are two peaks, one is the large value of the Zui, when the door body is in the horizontal position; and the other is the fixed value, when the door body is in the open position. According to the physics balance principle, the door body should not be dropped for a long time after being automatically opened and opened by the gas spring. The moment of the gas spring must be greater than the moment when the door body is at these two special positions. It is equal to the instantaneous moment of the door weight to the hinge O when the door body is in these two special positions. From this, it can be determined that the zui strong arm (R) required for the gas spring, the zui small force arm (r) are respectively (column, the calculation process is omitted):
The extension line of a tangent of a small circle intersects the large circle at point A, and point A is the upper mounting point of the gas spring. The lower mounting point B of the gas spring must be at a point below this tangent. The distance L between the two points of AB is the total length of the gas spring. It should be noted that point A must fall inside the door body and be more than 20mm from the door panel (because the upper mounting point of the gas spring occupies a certain spatial position), otherwise if it is outside the door, theoretically it is correct. But in fact, no one has placed the upper mounting point of the gas spring outside the door. Since there are any number of small circular tangent lines that satisfy the point A falling on the inside of the door body, the arrangement of the gas springs also has various inclination angle mounting forms, but they are completely equivalent in mechanics. At this point, as long as the formula for determining the total length of the gas spring is found, the lower mounting point B of the gas spring can be determined. According to the manufacturer's recommendation, the total length of the gas spring (zui, short size) = stroke 2 100 (the connection between the two ends of the gas spring and the process must be short length, unit: mm). When the door opening degree is greater than or equal to 135, the stroke can be taken as twice the Zui vigorous arm R, then the above formula can be written as: the total length of the gas spring (zui short size) = 4R 100. Of course, the total length of this formula is only the short dimension of the gas spring. It is also possible to take the total length of the gas spring larger than the short dimension of the zui (as long as the lower installation point of the gas spring does not exceed the effective installation range). In summary, since the length of the gas spring and the installation inclination have an infinite number of values, its installation position is not, but a range (infinite solution). Because of this, a properly installed position of the gas spring can easily be found in two or three trials, but that is blind, time consuming and energy intensive. With the two-circle method, it is completely possible to replace the actual test with theoretical calculations, saving time and effort, and selecting a good solution according to the actual installation space. The great advantage of Zui is that the result is reliable.
Jinan Zhongchuang Testing Machine Factory specializes in producing gas spring performance testing machine, automatic spring testing machine, spring fatigue testing machine, leaf spring testing machine, suspension spring testing machine, spring load sorting machine, spring transverse stiffness testing machine, air spring Various elastic component testing machines such as testing machines, spring fatigue testing machines, and vehicle spring testing machines.
Spunbond Fabric,Spunbond Nonwoven,Spunbond Non Woven Fabric,Hydrophilic Spunbond Nonwoven
ShaoXing SurgeCare Medical Products Co., Ltd. , https://www.sxsurgecaremedical.com