Analysis of the reasons that affect the failure of the tool bolt: According to the arrangement of the tool on the cutter head and the actual rock breaking process, the force of the tool bolt is a non-stationary variable load, and its amplitude and direction change from time to time.
According to the analysis of the factors affecting the failure of the tool bolt, and through long-term tracking observation and verification, the most important factors that affect the failure of the tool bolt are: the plane contact quality of the tool holder and the base; the cone surface of the bracket and the tool holder Contact quality.
The analysis of normal geological conditions is as follows.
(1) The plane contact bracket of the bracket and the cutter body is connected to the cutter body by bolts, and the cutter bracket is positioned by a flat key fixed by bolts. From the structural analysis, it can be regarded as a fixed connection, which has basically no effect on the failure of the tool bolt.
(2) The plane contact of the holder with the base, the base-to-bracket is in planar contact with the cutter body - the bracket is in contact with the tapered surface of the holder - the plane contact holder of the holder and the base is fixed by the bolt and the base . In actual use, it is found that due to the long-term load of the tool (each blade is subjected to a positive thrust of about 25t), and the lateral force of the tool during the rock breaking process, the contact plane of the base is crushed and deformed. , destroying the normal state of the contact surface, causing the tool bolt to fail. When the contact plane of the susceptor is deformed by extrusion, the indentation and deflection occur in the plane where the susceptor is in contact with the holder, and the magnitude is 0.5-2 mm, and the deformation amount of the same tool also changes greatly, so that This will result in poor contact between the seat and the base.
(3) The cone contact base of the bracket and the seat is fixed by bolts, and the mating angle of the bracket and the seat is 30 soil 3. Structurally, when the bolt is in the tightened state, it can be regarded as a fixed connection; when the bolt is loosened, detached and broken for some reason, it can be regarded as an active connection. This connection is also likely to cause other forms of damage to the tool; when the joints of the surrounding rock are developed and the quality of the touch surface is good or bad, it is the most important cause of failure of the tool bolt.
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