New technology for repairing worn holes in shafts of shield machines
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A shield tunnel boring machine (TBM) consists primarily of a shield head, cutting boom, cutting element, guide system, boring system, and support system. It can excavate and maintain tunnels of any shape and size. The cutting element and drive mechanism at the front of the machine are marked with the Chinese character "shield." The tunnel construction and underground navigation system at the rear facilitates positioning, casing installation, and debris removal, symbolizing the Chinese character "structure."
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A shield tunnel boring machine is a device used for excavating underground tunnels and is employed in urban subways, water management projects, municipal sewerage and water supply systems, transport, and mining tunnels. By automating construction and solving various problems, shield tunnel boring machines improve the efficiency and quality of construction.
Recently, a company discovered wear on the barrel of a shield harvester after intensive use and requested information about our reliable barrel repair methods and technologies.
Regarding methods and technologies for repairing shaft bores in shield machines, we recommend using online machining with a portable boring machine from JOYSUNG Industrial Technology Co., Ltd., combined with on-site welding using a portable repair welding machine. This can solve the wear problem.
1. First, secure the support fixture of the portable boring machine to the shaft bore being machined. This can be done by welding or by bolting holes on either side of the shaft bore. Once secured, insert the boring bar and align the center of the shaft bore being machined with the center of the repaired shaft bore with the bearing seating fixture on both sides.
2. After centering, install the boring machine's spindle head, feed box, and other components according to the wear condition, turning it into a complete machining system in place. After verifying that the worn area has been repaired from an elliptical bore to a round one, remove the remaining components of the portable boring machine, leaving only the bearing seats on either side of the shaft bore.
3. After this, the portable repair welder can be easily installed on the bearing seat without further centering. Adjust the equipment parameters according to the welding process to automatically complete the weld on the shaft's inner bore.
4. After welding the inner bore, the boring machine is reinstalled to bore the weld seam to the required accuracy dimensions specified in the drawing until the boring is complete. Boring machine accuracy requirements can reach 0.02 m ovality and 0.02 mm taper. This repair process allows for rapid resumption of production and reduces losses due to unplanned downtime. An efficient and reliable welding process extends the life of the equipment and simplifies maintenance. Report this wiki page