A device and method for automatically measuring the external friction angle of solids

Abstract

The invention relates to a device and method for automatically measuring an external friction angle of bulks. The device includes an inclined plane instrument, a lifting device, a monitoring device and a control system. The inclined plane instrument comprises a rotating groove, a vertical guide rail, a horizontal guide rail and sliding blocks; the rotating groove includes a front end and a rear end each rotatably connected with one sliding block; the sliding block at the front end is slidably connected with the vertical guide rail, and the sliding block at the rear end is rotatably connected with the horizontal guide rail; and the lifting device is connected with the sliding block at the front end, and drives the sliding block to perform vertical reciprocating motion on the vertical guiderail, the monitoring device is used for measuring the bulk state on the rotating groove, and the lifting device and the measuring device are in data connection with the control system separately. Thedevice for automatically measuring the external friction angle of bulks provided by the invention has the advantages that the stress state of bulks is stable and influence of a moving posture on the bulk state is small; the precision is high, the response is fast, the data are accurate, parallel data monitoring is adopted, and data reliability is high; and automatic measurement is realized, so that experiments are standardized, and the influence of human factors on measurement results is greatly reduced.

Description

technical field [0001] The invention relates to the mining field of underground metal mines, in particular to a device for automatically measuring the external friction angle of bulk. [0002] The invention also provides a method for automatically measuring the external friction angle of the solid body. Background technique [0003] In the mining process of underground metal mines, in order to make the loose body of caving ore slide freely along the airfoil of the ore opening, the inclination angle of the airfoil must be greater than the external friction angle of the loose body of ore. The external friction angle of ore and rock bulk refers to the angle between the inclined plane or chute and the horizontal plane at the moment when the bulk changes from a static state to a moving state (starts to slide) along the slope or chute. Therefore, it is of great significance to accurately measure the external friction angle of ore-rock bulk under different conditions to improve th...

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Problems solved by technology

[0004] Some existing experimental equipment includes a rotating trough. One end of the rotating trough is connected to the frame through a rotating shaft, and the other end can rotate around the rotating shaft. The bulk is lifted by the thrust of the rotating trough, but its movement is unstable, and the error caused by inertia is large.

[0005] At present, in the existing measurement experiments, all are manual lifting, naked eye identification, manual recording, etc. During the experiment, the labor intensity is relatively high, the experimental procedures are cumbersome, and the measured external friction angle is greatly affected by human factors. To a certain extent, the accuracy of the experiment is reduced, which is not conducive to the scientific research on the external friction angle of ore rocks

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