Secondary impact preventing device of drop hammer impact testing machine and testing method of secondary impact preventing device

Abstract

The invention relates to a secondary impact preventing device of a drop hammer impact testing machine and a testing method of the secondary impact preventing device, and belongs to the technical fieldof engineering experiment equipment. The secondary impact preventing device comprises a top plate, a base, supporting rods, guide rods and a sliding plate, wherein an electromagnetic capturing and lifting device is arranged under the top plate; an objective table is mounted on the base, and a cushion block is mounted on the objective table; supporting rods are fixed to the periphery of the base,guide rods are installed in the middles of the supporting rods, and the upper portions of the supporting rods and the guide rods are fixed to the top plate; the two ends of the sliding plate are installed on the guide rods, the balance weight chamber is installed under the sliding plate, a hammer base is installed under the balance weight chamber, and a drop hammer is installed under the hammer base; a fixing rod is installed in the center of the counterweight chamber; and an infrared emitter I, an infrared emitter II, an optical sensor I and an optical sensor II which are level with the top part of a sample are mounted at the lower ends of the four supporting rods respectively. By means of electromagnetic capture and lifting, the possibility of secondary impact is effectively reduced, operation is convenient, the structure is simple, and impact tests of different types of hammer heads can be conducted on samples of various test specifications.

Description

Technical field[0001]The invention relates to a secondary impact prevention device for a drop hammer impact tester and a test method thereof, in particular to a device suitable for drop hammer impact experiments in geotechnical engineering, mining engineering, and civil engineering, belonging to the technical field of engineering experimental equipment .Background technique[0002]In the rock dynamics experiment, the drop hammer impact testing machine is used to conduct one or more pre-impact experiments on the rock sample, and then analyze and study the damage and failure of the rock sample under different times of pre-impact, and the impact of the rock under different damage conditions The study of static and dynamic characteristics is of great significance.[0003]The principle of the falling weight impact testing machine is to raise the falling weight to the required height to increase the weight of the falling weight, release the falling weight to make a free fall motion, make it i...

AI Technical Summary

Problems solved by technology

In most of the current patents, the mechanical card slot prevents the bounce-up of the test piece with high accuracy. When the size of the test piece fluctuates within the allowable range, it may cause a very rapid, subtle secondary impact that is invisible to the naked eye, which affects the The experimental results cannot maintain the accuracy of the experiment; the pure electromagnetic device indirectly affects the calculation of the experimental results in the start-up time response and the calculation of the kinetic energy of the falling hammer; It stops the upward movement, and as the number of uses increases, it will cause wear and damage together, which will affect future use; the isolated type has strict requirements for the height of the pop-up and push-out of the partition or energy-absorbing plate, buffer plate, and for different test pieces , the bouncing height of the falling hammer is different. When the bouncing height is small, the separator is too late to be pushed out or because of the small height after it is pushed out, it will still cause secondary impact damage to the specimen.

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