A device for preventing secondary impact of falling hammer

Abstract

The invention discloses a device for preventing the secondary impact of a falling hammer, which comprises a test bench and a falling hammer. The top of the test bench is provided with a left positioning block and a right positioning block parallel to each other. The top of the positioning block is provided with a right guide column, and the drop hammer can slide up and down along the left and right guide columns at the same time, and a pressure column is arranged between the left and right guide columns; the top of the left positioning block is provided with a left crank slider mechanism, and the right The top of the positioning block is provided with a right crank-slider mechanism, the left and right crank-slider mechanisms both include a first connecting rod and a second connecting rod, and the relative positions of the left and right guide columns are provided with protruding grooves at the opposite inner sides. One end of the second connecting rod can go in and out along the protruding groove, and the device also includes a trigger mechanism for driving the first and second connecting rods in the left and right slider crank mechanisms to move. The invention can effectively prevent the falling hammer from colliding with the pressure-bearing column again when it falls for the second time, and has simple structure and convenient operation.

Description

technical field [0001] The invention belongs to the technical field of hammer drop control in roadway test systems, and in particular relates to a device for preventing secondary impact of a drop hammer. Background technique [0002] In the similar test of deep roadway excavation, dynamic load needs to be applied to the roof of the roadway. The dynamic load is realized by the impact of the falling weight. After the falling weight falls, it bounces and hits the upper part of the roadway again, which will affect the test results and affect one impact. Test the accuracy of the experimental results. At present, the research on anti-secondary impact at home and abroad mainly includes mechanical, pneumatic, electromagnetic, hydraulic and so on. Such as semi-automatic pneumatic clamping device, computer automatic control of drop height and lifting of drop hammer; automatic capture by electromagnet to prevent the sample from being impacted again. And most of the existing anti-drop...

AI Technical Summary

Problems solved by technology

Moreover, most of the existing anti-dropping hammer secondary impact devices are aimed at the anti-secondary impact device on the small-scale impact testing machine, and lack the anti-dropping hammer test device for large-scale impact tests.

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