The locking is firm, the beautiful appearance of the cradle is locked by the four-bar linkage mechanism, the lifting and releasing pressure are light, the pressure is stable and reliable, the cradle can pick up the angle of 45b or 75b, which is easy to clean; the plastic coating layer has strong corrosion resistance. Long-lasting and durable, the color is soft and even.
Discussion on the problem of spring pressurization The nature, material, processing technology and geometric design of the spring in the spring pressurization system will affect the pressurization effect. The deformation of the spring after compression, that is, the relationship between stress and strain is shown by the following formula: the deformation amount of the spring after the force is F=8PC3n/Gd(mm) where: P spring working pressure/N; C spiral ratio, C=D2/ d (D2 spring medium diameter); n spring working circle number; G spring material shear modulus / (Nmm-2); d spring wire diameter / mm.
The number of working rings of the spring should not be less than 3 turns, and the support ring is preferably 1/2 turn. The spring diameter is related to the winding helix ratio C value, and the smaller the helix ratio C value, the larger the curvature (ie, the smaller the spring is wound), the more difficult the coiling of the spring.
In order to avoid the eccentric load (the pressure does not pass through the axial line of the spring and has a certain eccentricity e from the axis), causing excessive additional force, the working position of the spring should be ensured. In order to eliminate the ingot difference as much as possible, the main method of making the spinning strips uniform is to increase the shear modulus of the spring and increase the diameter of the steel wire, and to reduce the number of working rings of the spring as much as possible.
The ratio of the height dimension to the spring diameter before the spring deformation is related to the stability of the spring after pressurization. The ratio of the spring height to the spring diameter should not exceed 5.3. In order to adjust the stability of the spring work, the maximum load Pmax should meet the critical load. The ratio to the actual load = 2.02.5; if the pressure is too high, the spring may lose stability.
The design features of the same and the cradle compression spring adopt international high-quality brand-name valve steel wire, which improves the shear modulus of the spring material, thereby improving the stiffness, strain reduction and stable pressure of the spring. The same spring meets the various conditions of the above analysis, that is, the ratio of the spring height to the spring diameter is not more than 5.3; the ratio of the critical load to the actual load reaches 2.02.5, which makes the spring pressure stable.
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