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Free fall method 2: repeated free fall
August 14, 2013. Source: zhenghang instruments. Author: anonymous

Free fall method 2: Repeated free fall

This test is used to simulate the repeated impact of some components, such as connectors in use , Bian - The impact.

The test sample shall be placed in the test equipment to withstand the specified number of drops. When the test sample is equipped with cable, the relevant specification shall specify the cable type to be used. Unless otherwise specified in relevant specifications, when the test sample is equipped with cable, the 100mm The long cable is connected to the sample.

(1) Repeated drop test equipment

Unless otherwise specified in relevant specifications, the test sample shall be dropped to a thickness of less than 10mm~19mm Between the wooden mat lining 3mm Smooth, hard and firm test surface of thick steel plate.

If the volume of the test sample prevents the weight S Free fall, roll slip may not be suitable for heavy equipment.

Repeated free drop graph 3.?5?-?1 A combined form of the test equipment is a cylinder that rolls and causes the sample to drop and roll. When there is a large sample to be tested, the cylinder can have many compartments, and each sample is placed in a compartment so that the test can be carried out at the same time.

Width of each compartment W No regulation, but according to the sample size -. It's a good idea 200mm?300mm

The dimensions of the roller are shown in Fig 3.5-1 give. Each end is 3mm Smooth test surface of thick steel with backing 10mm??19mm Thick planks.

In the compartment where the sample is dropped twice, a piece of ISCM8:?1979 Determination of hardness of vulcanized rubber 30?IRHD?85?IRHD The required hardness is 80?IRHD Scholar 20?IRHD It is made of smooth and hard plastic plate for each sliding surface of the cabin.

The drum shall be designed so that the shaft does not protrude from the interior of the test chamber.

A small window with a cover shall be opened on the drum, and the window cover shall be made of transparent polypropylene material. ?