Compression Spring Usage Case (I)
I. Design Idea
Design purpose: Applying a spring on a probe device.
Design scenario:
1. The structure consists of two probes placed on a pressure plate. The diameter of each probe is 3mm, and the center distance between the two probes is 10mm.
2. A shaft sleeve is placed on the probe, and the shaft sleeve works back and forth relying on the spring's rebound force.
3. The installation space for the built-in spring is 15mm. The spring force of a single spring is between 500-800g. The total spring force is within 1500g.
II. Selection Idea
Installation space:
Since the space for the built-in spring is 15mm, it needs to be determined whether the length should be reserved a bit longer for preloading the spring or just choose a length that is just right. (The main purpose of preloading is to prevent the spring from loosening during movement).
Since the diameter of the probe is 3mm, the inner diameter of the selected spring should be at least not less than 3mm. It is better to be about 1mm larger than 3mm. Then, since the center distance between the two probes is 10mm, the outer diameter of the spring should not be larger than 10mm (with a radius of 5mm), and it is better not to be larger than 9mm.
Load:
Since the spring force of a single spring is between 500-800g (converted unit: 5N-8N), the maximum load of a single spring should not be less than 5N.
Conclusion:
Combining the above conditions, finally the model YWL-D5-L15 is selected. This model has an inner diameter between 3.5-4, an outer diameter of 5, a length of 15, and a maximum load of 5.9N, all of which meet the requirements of the mechanism.
Compression Spring Usage Case (II)
I. Design Idea
Design purpose: Applying a spring on a flipping mechanism.
Design scenario:
1. The structure consists of four guide rods placed under the pressure plate. The diameter of the guide pins is 12mm.
2. When the mechanism is flipped, the yellow pressure plate will compress the spring, and then the manipulator takes the part on the pressure plate.
3. The installation space for the built-in spring is 20mm. The weight of the yellow pressure plate is 0.5kg. The height of the spring after being compressed is 15mm. At this time, the spring has not been completely compressed to the bottom.
II. Selection Idea
Installation space:
1. Since the space for the built-in spring is 20mm, it needs to be determined whether the length should be reserved a bit longer for preloading the spring or just choose a length that is just right. (The main purpose of preloading is to prevent the spring from loosening during movement).
2. Since the diameter of the guide rod is 12mm, the inner diameter of the selected spring should be at least not less than 12mm. It is better to be about 1-1.5mm larger than 12mm. The inner diameter of the spring is most suitable between 13-13.5.
Load:
Four springs are subjected to a force of 0.5kg, that is, the force on a single spring is 1.25N. According to the fact that the length of the spring is shortened by 5mm after being subjected to force, it can be concluded that: spring constant = load/compression amount = 1.25/5 = 0.25N/mm.
Conclusion:
Combining the above conditions, finally the model YWR-D16-L20 is selected. This model has an inner diameter between 13.6-14.4, a length of 20, a maximum compression amount of 12. When the working height is 15mm, the maximum load is 1.45N, all of which meet the requirements of the mechanism.
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