Screw conveyor jammed position detection method for soil pressure balance shield machine
A screw conveyor and earth pressure balance technology, applied in the direction of measuring devices, instruments, etc., can solve the problems of affecting the construction progress, difficult to observe the state of the slag and soil of the screw conveyor, and difficult to get out of trouble, so as to reduce downtime and improve detection. And the effect of removing speed and improving driving efficiency
Active Publication Date: 2019-01-22
CENT SOUTH UNIV
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Problems solved by technology
In addition, the size of the screw conveyor is large, the observation port is small and the positions are too scattered, it is difficult to observe the state of the muck inside the entire screw conveyor after cleaning, and it is difficult to accurately determine the specific location where the screw conveyor is stuck
At present, when the location of the stuck point cannot be determined, the screw conveyor can only be released through forward and reverse and telescopic movements
Blind operation may lead to long time consumption, difficulty in getting out of difficulties, seriously affecting the construction progress, and may even cause damage to the screw conveyor and other problems.
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[0017] The existing screw conveyor stuck point detection has not yet formed a relatively accurate quantitative detection method, and it is difficult to find the stuck point position accurately and conveniently, and then carry out targeted relief treatment. When a large-sized foreign matter enters the screw conveyor, a force point is formed between the blade of the screw conveyor-foreign matter-the barrel of the screw conveyor, which causes the friction between the blade of the screw conveyor or the foreign matter and the inner wall of the barrel of the screw conveyor Increased friction. When the force reaches a certain size, the blades of the screw conveyor will not be able to rotate, and then a stuck fault will occur. When a stuck fault occurs, the forward and reverse rotation or telescopic movement of the screw conveyor blade will change the force at this point and cause deformation of the screw conveyor cylinder near the force point. The deformation of the screw conveyor c...
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The invention discloses a screw conveyor jammed position detection method for a soil pressure balance shield machine, and belongs to the technical field of screw conveyor defect part detection. The detection method comprises the following steps of: selecting strain measurement points on the outer wall of a barrel of a screw conveyor, and after primary processing, arranging strain sensors; connecting each measurement point to a testing instrument; carrying out a screw conveyor blade positive and negative rotating or telescoping operation and acquiring strain data under limit working conditions;and by analyzing a change rule of each group of strain data, finding out a maximum value of a strain of the barrel of the screw conveyor, and finally, determining a jammed point position. According to the invention, a problem of difficulty in accurately determining the jammed point position only by experience-based judgment when the screw conveyor is jammed is solved; detection accuracy and efficiency are improved; and meanwhile, the risk caused by a case of carrying out observation cleaning and blind operation to get out of trouble is avoided.
Description
technical field [0001] The invention relates to a stuck fault detection method of a screw conveyor, in particular to a stuck position detection method of a screw conveyor of an earth pressure balance shield machine. Background technique [0002] The earth pressure balance shield machine is mainly used in the excavation of urban subways or underground pipe gallery tunnels with soft rock formations. The excavated muck is transported by the screw conveyor behind the cutter head. The slag discharge efficiency of the screw conveyor is directly Affect the construction efficiency of shield tunneling. Due to the inability to monitor the state of muck in the ballast chamber in real time, it is very likely that rocks, iron pieces or other objects with large diameters will enter the screw conveyor, causing the screw conveyor to be stuck. An observation port is installed on the screw conveyor. When a jamming problem occurs, it is generally necessary to open the observation port, clean ...
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Login to View More IPC IPC(8): G01B21/00G01B21/32
CPCG01B21/00G01B21/32
Inventor 夏毅敏傅杰吴遁刘玉江杨妹沈烽李清友林赉贶陈阵王洋
Owner CENT SOUTH UNIV