We have introduced several applications of the power spring in real life, and we know power spring not only keep certain elasticity in all the trip, but also compared with the line of the spring, the trip of prestressing force is more shorter. Dongguan Yongsheng Metal Products Co., Ltd. has specialized in product developing and producing of power spring, coil spring and constant force spring for 15 year,  and next we’ll introduce the application of the lift spring in range hood.

We once developed a constant force spring, but not all the constant force can have a constant force spring to realize its constant index. Such as the requirement of this customer, he want to keep an article in a constant position via a constant force spring, while can’t assemble any positioning switch, arbitrary positioning up or down, and the force is lighter than the weight of object itself. And the constant force should be stable, and can’t fall or move, hence the object will vibrate under the work condition.

For the constant force of this kind of spring, we also have several problems: the first one is the strength requirement of spring. When the constant force is too large, the spring will drive the object, on the contrary, when the constant force is too small, the object will drive the spring, hence can’t meet the requirement of constant force. The second one is when the object move, the force for the object up and down is lighter than the weight of the object itself with the vibration. Two questions become a barrier to develop the function of spring, and we have a felling like treading as on eggs.



We will talk with our customers about the problems before producing, provide suggestions for assembling the spring, and introduce the auxiliary function of the spring after assembling. Hence get customer’s approval and the biggest limit of installation space. And make the installation position and the information of products more comprehensive, provide solutions of problems about the constant force and stability of the spring.  

Although we have found out the unstable performance of spring, we still meet a unstable factor when we develop spring. And as a direct result with a strong recovery of spring, make the object produce powerful impact, and crash the shell of products. Then we check experiment and find that the problem is caused by the vibratory force and the upward suction. And the customer tell us it is product for oil absorption of the elevator at this time.Because this is a high grade of oil absorption with relatively strong suction, when we raise its mouth to a higher position, wind power blow the lifting window, the tension of spring pull up automatically, hence lead to a unstable force. 

After further improvement, we suggest customer to change the “lift spring” installation, for the reason that the cause of problem is suction. In the lift driving process, make the force of spring raise naturally in the process of drop-down, on the contrary, make the force of spring reduce in the process of rising. And after changing the angle of installation, container of spring has certain resistance, let the recovery force reduce but the tension increase. So the lift spring can meet a long-term and stable constant force in the process of work or non-work time.