Blasting vibration meter for soft soil

Abstract

The invention belongs to the field of intelligent manufacturing technologies and discloses a blasting vibration meter for soft soil. The blasting vibration meter comprises a supporting plate, a threaded rod and an induction shell; the threaded rod is welded to the bottom of the supporting plate; and the induction shell is installed on the supporting plate. A first magnet and a second magnet are used in a matched manner, so that a spring component inside a sensor can be directly removed; and therefore, when the sensor is used, the repulsive action of the two magnets is utilized, a magnetic field force can be adopted to replace an elastic force, an interval between the magnets can be adjusted, so that the magnitude of the elastic force can be adjusted, and therefore, the natural frequency ofthe blasting vibration meter can be changed, and the blasting vibration meter can accurately detect vibration signals when being used under a low frequency. With the blasting vibration meter for softsoil adopted, the problem that a blasting vibration meter in the prior art fails to measure low-frequency signals can be solved; the energy loss of a spring during use can be solved; a phenomenon that the elastic strength of the spring is reduced during use can be avoided; and elastic components inside the blasting vibration meter always maintain good states.

Description

technical field [0001] The invention relates to the technical field of intelligent manufacturing, in particular to a blasting vibrometer applied to soft soil. Background technique [0002] The blasting vibrometer is a portable special device for long-term on-site collection, recording and storage of blasting vibration and impact signals. It is mainly used to monitor the signals generated during blasting. [0003] The blasting vibration meter is mainly composed of a vector sensor and a host. The vector sensor receives the vibration signal and transmits it to the host. When the vector sensor is detecting, it needs to be rigidly connected with the object under test to ensure that the sensor can accurately detect the vibration signal. The instrument has the following problems during use; [0004] The installation structure of existing sensors in soft soil such as Figure 8 As shown, most of them insert the steel drill 20 into the ground, then install the top plate 19 on the end...

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Problems solved by technology

[0004] The installation structure of existing sensors in soft soil such as Figure 8 As shown, most of them insert the steel drill 20 into the ground, then install the top plate 19 on the end of the steel drill 20, coat the top plate with gypsum 21, and then install the sensor. Insert the steel drill 20 into the ground, and then fix it with gypsum 21. You need to carry the gypsum 21 and a water source. Because the sensor is very sensitive to temperature, and the gypsum 21 contains moisture, it is easy to affect the accuracy of the sensor measurement, and it takes time to wait for the gypsum 21 to solidify. , the solidified gypsum 21 adheres to the surface of the sensor, and it needs to be scraped off again with a blade. At the same time, when the sensor is measuring, after the building is blasted, the body wave propagating in the ground surface and the surface wave transmitted on the ground surface, body wave and surface wave When propagating, the nearby soft soil layer will be squeezed and deformed, causing the sensor to tilt, unable to accurately measure the horizontal and vertical vibration waves, resulting in errors in the measurement results of the tilted sensor, unable to accurately measure the explosion signal, and affecting the follow-up Work

[0005] The frequency tested by the existing blasting vibrometer is 10HZ ~ 300HZ, and the main vibration frequency after blasting is 2HZ ~ 200HZ, and the main frequency is lower as the blasting scale is larger (the main vibration frequency is 0.5HZ ~ 5HZ) The working principle of the existing vector sensor is as follows Figure 9 As shown, when the blasting of the building starts, it drives the nearby ground to vibrate, then drives the base to vibrate, and then drives the mass block 23 to move. Within the working frequency range of the sensor, it is bounced by the spring piece 25, and then the coil 24 and the magnet 22 move relative to each other. , cutting the lines of magnetic force, and generating an induced voltage in the coil 24, the output signal can be generated. When the blasting vibrometer is in use, it can only detect values ​​within the frequency range. The numerical calculation formula of the blasting vibrometer sensor is: g is the acceleration constant, m is the mass block, k is the elastic coefficient of the spring, and wo is the natural angular frequency. When fo is 1HZ, the relative displacement reaches 25cm, which is affected by the volume of the sensor. Within the frequency range of 1HZ, blasting vibration measurement The output signal of the instrument is extremely weak, the signal-to-noise ratio is low, and the vibration data generated by blasting cannot be accurately tested. As a result, the scope and vibration of the blasting cannot be estimated, the safety range cannot be determined, and the data error is large, which in turn affects the follow-up work.

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