The locking mechanism is firm and reliable, with the cradle's elegant design secured by a four-bar linkage system. The lifting and releasing actions are smooth and require minimal pressure, ensuring consistent and stable performance. The cradle can be adjusted to angles of 45° or 75°, making it easy to clean and maintain. Additionally, the plastic coating offers excellent corrosion resistance, ensuring long-term durability and a soft, even color finish.
When considering the issue of spring pressurization, several factors—such as the material, manufacturing process, and geometric design of the spring—play a crucial role in determining the effectiveness of the pressurization. One key aspect is the deformation of the spring under load, which is described by the formula: F = (8PC³n) / (Gd), where:
- P is the working pressure of the spring (in Newtons),
- C is the spring index, calculated as C = Dâ‚‚/d (where Dâ‚‚ is the mean diameter and d is the wire diameter),
- n is the number of active coils,
- G is the shear modulus of the spring material (in N/mm²),
- d is the wire diameter (in millimeters).
The number of active coils should not be less than three, while the support coil is typically around half a turn. The spring’s diameter is closely related to the helix ratio C. A smaller C value means a tighter coil, which increases the curvature but also makes the coiling process more challenging.
To prevent eccentric loading—where the force doesn’t act along the spring’s central axis and creates an offset e)—it’s essential to ensure the spring is properly positioned. This helps avoid excessive additional stress. To minimize variations in the spring’s performance, one effective method is to increase the shear modulus of the material and use a larger wire diameter, while reducing the number of active coils as much as possible.
The ratio of the spring’s free height to its mean diameter significantly affects its stability after compression. This ratio should not exceed 5.3. To ensure proper stability, the maximum load Pmax must be carefully controlled so that the ratio of the critical load to the actual load is between 2.0 and 2.5. If the load is too high, the spring may become unstable and lose its shape over time.
The design of the cradle’s compression spring incorporates high-quality international brand-name valve steel wire, which enhances the shear modulus of the material. This leads to improved stiffness, reduced deformation, and more stable pressure. The spring meets all the necessary conditions discussed above, including a height-to-diameter ratio of no more than 5.3 and a critical load-to-actual load ratio of 2.0–2.5, ensuring reliable and consistent performance.
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