Mechanical property testing device with improved anti-interference performance

Abstract

The invention discloses a mechanical property testing device with improved anti-interference performance, which comprises a falling ball, a support and an acceleration sensor, the support and the acceleration sensor are mounted on the front surface of the falling ball, the acceleration sensor is mounted at the midpoint of the front surface of the falling ball, and a mica sheet is arranged at the joint of the falling ball and the acceleration sensor. The support comprises a first connecting piece and a second connecting piece, the lower end of the first connecting piece and the lower end of the second connecting piece are arranged on the side away from the acceleration sensor, the distance between the acceleration sensor and the first connecting piece and the distance between the acceleration sensor and the second connecting piece are L, and the distance between the acceleration sensor and the edge of the falling ball is R, l is larger than or equal to the upper ends of the first connecting piece and the second connecting piece and is in lap joint with a third connecting piece, so that the connecting pieces of the bracket avoid a central propagation area, the influence of the bracket on waveforms is reduced, and meanwhile, a mica sheet is added to reduce transverse friction between an acceleration sensor and a falling ball when the testing device impacts concrete; and meanwhile, signal interference caused by friction is reduced.

Description

technical field [0001] The invention relates to the technical field of mechanical property testing, in particular to a mechanical property testing device with improved anti-interference performance. Background technique [0002] In the implementation process of construction, road surface, bridge and other projects, it is usually necessary to test the strength of concrete. The testing devices in the prior art are as figure 1 As shown, the bottom of the acceleration sensor installed on the test device is in direct contact with the falling ball of the test device. When the test device is in use, it directly impacts the concrete surface, and the acceleration sensor obtains the waveform signal generated during the impact. The corresponding strength index is calculated, but when the impact occurs, the acceleration sensor may produce lateral friction with the test device falling ball, which will interfere with the waveform signal and affect the accuracy of the test. At the same tim...

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Problems solved by technology

[0002] In the implementation process of construction, road surface, bridge and other projects, it is usually necessary to test the strength of concrete. The testing devices in the prior art are as figure 1 As shown, the bottom of the acceleration sensor installed on the test device is in direct contact with the falling ball of the test device. When the test device is in use, it directly impacts the concrete surface, and the acceleration sensor obtains the waveform signal generated during the impact. The corresponding strength index is calculated, but when the impact occurs, the acceleration sensor may produce lateral friction with the test device falling ball, which will interfere with the waveform signal and affect the accuracy of the test. At the same time, the bracket of the test device in the prior art is installed on In the center of the front of the falling ball, the first fixing member such as the bracket screw is relatively close to the position of the sensor. The waveform generated by the impact will be interfered by the first fixing member and thus affect the accuracy of the test. In addition, the test device bracket and the sensor in the prior art are integrated Therefore, it is of great significance to provide a mechanical characteristic testing device with improved anti-interference performance for the above problems.

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