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Free drop method of drop testing machine
August 14, 2013 source: navigation instruments Author:

Free drop method of drop testing machine ?

This test is a simple test to determine the impact of drop due to rough handling. If the relevant specifications are specified, the test sample shall be allowed to fall freely during normal transportation or use. Unless otherwise specified in relevant specifications, the test sample shall be dropped twice according to the specified posture.

Self falling test equipment

The surface of test equipment made of concrete or steel shall be smooth, rigid, hard and eleven Keep it level. The steel plate shall be floated by wetting, that is, when the concrete is still wet, the steel plate shall be installed to eliminate pores or bond to the concrete. For light equipment and test sample, the surface quality of test equipment shall be at least equal to that of test sample twenty Times. The thickness of steel plate shall be greater than 25mm When the mass of the test sample exceeds 500kg The thickness of steel plate shall be at least 40mm At the angle between two And the hardness is Brinell 90?300

The same product of Dian Wei fl Drop equipment (see Fig 3.7-9) There is a test preparation platform for the test sample. The sample to be tested is placed on the platform according to the specified test attitude. At the beginning of the test, the preparation platform moves downward with the acceleration greater than the free falling body, and separates from the test sample; at the same time, it quickly withdraws to the side to make room. The sample is in free falling state and finally falls on the specified surface. The equipment has an auxiliary device for adjusting the height and keeping the test sample's attitude.

When the sample is falling freely, if the sample rolls over due to the partial moment of the sample itself, it has nothing to do with the test manipulation.

Test procedure

If there are provisions in relevant specifications, the table shall be followed according to the conditions of test samples 3.?5-1 Drop height selected in.

The drop height shall be the height between the test surface and the nearest sample position when the test sample is suspended before dropping.

The method of releasing the test sample shall be such that the test sample falls freely from the hanging position. When releasing, the interference should be minimized. The relevant specifications shall specify the surface and angle of the test sample subjected to drop test.