A Design Method to Eliminate Lateral Force and Reduce Tbm Hob Wear
A design method and lateral force technology, applied in mining equipment, earthwork drilling, tunnels, etc., can solve problems such as the inability to fundamentally eliminate lateral impact, fatigue and wear, high cost of material research and development, and accelerated wear failure. Achieve the effect of avoiding side impact, reducing wear, and reducing wear of the cutter ring
Active Publication Date: 2022-07-22
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology
[0009] 1. The cost of material research and development is high, the cycle is long, and it is impossible to fundamentally eliminate the lateral impact, fatigue and wear caused by the rotation of the knife ring
[0010] 2. Considering the effect of rotation, the leading and trailing edges of the rock cutter contact area of the existing vertical hob cutter ring have a tendency to rotate, making the hob not purely rolling to break the rock, especially for hobs with small installation radius (such as the center hob), the rotation tendency of the leading and trailing edges of the cutter ring is more obvious, which will significantly accelerate its wear failure
[0011] 3. Due to the rotation effect, ω R Objectively, only relying on a single means of changing the configuration of the blade cannot fundamentally eliminate the lateral force and the resulting wear of the TBM hob
[0012] 4. Only adopting inwardly inclined installation will make the contact behavior of the knife rock different from that of the hob installed directly, reducing the rock breaking effect
Method used
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Embodiment Construction
[0040] For the convenience of those skilled in the art to understand the technical content of the present invention, the following technical terms of the present invention are first explained:
[0041] TBM (Tunnel Boring Machine): full-face tunnel boring machine
[0042] Rotation: Due to the rotation of the cutter head, the hob rotates around the center of the cutter head
[0043] ω R : Rotary angular velocity of cutter head
[0044] ω r : Rotation angular velocity of disc hob under the action of friction
[0045] R: The installation radius of the disc hob on the cutter head
[0046] r: Disc hob radius
[0047] Global coordinate system (Cartesian coordinate system): The coordinate system where the object in three-dimensional space is located, which does not change with the movement of the object. figure 1 (a) shown in the coordinate axis XYZ;
[0048]Local coordinate system (cylindrical coordinate system): In order to define the rotary motion of the disc hob itself, a ...
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The invention discloses a design method for eliminating lateral force and reducing the wear of TBM hob, which is applied to the field of disc hob equipment. The problem of impact wear and fatigue failure; the present invention eliminates the lateral speed caused by the rotary motion of the hob by combining the inclination installation method of the disc type hob and the method of improving the configuration of the cutter ring, thereby preventing the cutter ring from being subjected to lateral impact and Reduce side slip and wear, and prolong the service life of the hob. Combined with the modified blade design, the configuration of the cutter ring in the contact area between the cutter and the rock is the same as that of the installed hob. Under the same penetration effect, the rock breaking effect is the same as that of the installed hob.
Description
technical field [0001] The invention belongs to the field of disc-shaped hob equipment, and particularly relates to a disc-shaped hob combined with blade modification and inclination installation. Background technique [0002] TBM mainly relies on the rolling and rock-breaking behavior of the hob for tunnel excavation operations. The disc hob performs compound motion in three-dimensional space: (1) the disc hob cutter shaft rotates around the center of the cutter head; (2) the disc hob rotates around the cutter head The tool shaft rotates. In the process of TBM tunneling, the disc hob is mainly subjected to vertical force, lateral force and rolling force. The center hob, the positive hob and the side hob are sequentially arranged from the inside to the outside of the cutter head. Among them, the hob with the installation radius close to the center of the cutter head, that is, the central hob and part of the positive hob, is subjected to periodic intermittent impact load on...
Claims
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IPC IPC(8): E21D9/11
CPCE21D9/112
Inventor杨丹刘文韬郑靖周仲荣吴志鑫莫继良段文军张蒙祺
OwnerSOUTHWEST JIAOTONG UNIV