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The power spring makes the tape measure shrink freely

источник:Цянь Точность время:2022-9-14

Tape measure, I believe everyone is familiar with it. Tape measure is a common measuring tool in our daily life and work. After the tape measure is pulled out, it can be rolled up because there is a power spring in the tape measure. When pulling out to measure the length, it actually lengthens the length of the scale and spring. Once the measurement is completed, the spring in the tape measure will automatically shrink, and the tape will also shrink under the action of spring force, so the tape measure will roll up.
The power spring is an elastic fitting in the tape measure. The end of the steel bar scale is connected to the front end of the spring, and the end of the spring is fixed in the middle of the tape measure. The tape measure mainly uses the energy storage characteristics of the spring, which can be said to be the conservation of mechanical energy .When you pull the tape measure, you work on the internal spring, and the energy is stored by the power spring; when you release it, the spring relaxes, releasing energy and causing the tape measure to retract automatic contraction uses the lever torque principle: in the stretching state, the force arm is the smallest and the spring output is the largest; in the retracted state, the force arm is the largest and the spring output is the smallest.

        When the scale is pulled out, the spring is tightened to produce a force to roll back. When the tension of the scale is released, the scale is pulled back by the tension of the power spring. As long as the difference between the longest and the shortest power spring is greater than the maximum length of the tape measure, the spring will not exceed the deformation limit and cannot be retracted. The method of measuring the quality of the tape measure is not complicated. First, it depends on whether the tape is easy to retract after being pulled out, and second, it depends on the thickness and tenacity of the tape. There will be no bending due to too long pulling. Some people may wonder why the tape measure didn’t fail because it was so deformed? The answer is not complicated. In fact, it is because the winding spring in the tape measure is very long, and its complete relaxation to complete contraction range is very large. The whole stroke of the tape measure includes it, and there is allowance at both ends, so the tape measure will not fail. From this, we can see the importance of the power spring to the tape measure.

       Shenzhen Qianye Precision Metal Co., Ltd. has 17 years of production experience in spring. Starting from the research and development of initial materials and through cooperation with large domestic steel mills, it has solved the nationalization production of 301 super hard stainless steel materials, which can fully meet and meet the performance requirements applied to such spring products. According to the needs of customers and assist in product design, development and proofing, so that your products can find the best solution to meet your application needs. Sincerely welcome new and old customers and friends from all walks of life to visit the company and negotiate business cooperation. Qianye precision will serve you wholeheartedly!

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