Many, mainly due to the rapid changes in rock conditions for more developed fractured rock formation or operation reasons to adjust to excessive or excessive thrust, and the difference between the amount of wear of the tool is not reasonable adjacent tools, resulting in overloading of individual tools, so that the tool The bearing end of the bearing tapered roller peeled off, and the peeled metal fragments and particles failed the seal.
The temperature of the bearing and lubricating oil is too high due to the bad water jet system.
Due to the poor condition of the vermiculite at the front of the cutterhead, the collapsed large rock stuck at the seal of the tool end cap, which caused the sliding seal to fail due to the impact load.
The life of cutter bearings and floating seals has reached its limit.
During the tool repair process, the size of the spacer does not conform to the specification or the tool is mixed with debris. 5 Cutter peeling Fatigue cracking occurs due to the wear surface of the cutter ring, which gradually spreads to cause micro-fracture wear and peel. From the inspection of the tool, the peeling block of the general knife circle is small, which does not affect the normal operation of the tool.
6 Breakout or breakage of the retaining ring Welt's 0432 positive reel and side cutter's cutter ring are the two-half butt-welded safety retainers, making it easy to replace the cutter ring and prevent the cutter ring from shifting. Due to centrifugal force, the force of the cutter ring acting on the cutter body is directed to the outside, so the force is generally less on the inside, but during the construction process, because the rock on the front of the cutterhead is broken, the collapsed big stone will often retain the collar. Broken or detached until the knife circle shift occurs, making it difficult to change the tool. Since May 1998, we have used the Huanggong HXW200A excavator to face the development of the western region. The western digging factory has taken the initiative to attack according to market demand. After months of efforts, it has developed and produced the original natural climate environment. 2. Full hydraulic excavation machine.
The Jia 200 six-hydraulic excavator is designed for the harsh conditions of the desert in the western region where there is a lot of temperature and thin air. The air intake system of the aircraft adopts multi-stage filtration to effectively prevent the intrusion of sand and dust; the use of a wide track shoe in the walking part minimizes the ground pressure and enables the excavator to operate reliably in the soft desert. The machine also uses a turbocharger to make the fuel fully burn the construction machinery. 20007 Two steel rods of the thorium 70 are used for lap welding 2 of the retaining ring, which enhances the bearing strength of the retaining ring, thereby greatly reducing the shedding of the retaining ring.
7 Tool bolts loosen off and off the knife, etc. The original records show that with the increase of the number of tool change, the loosening of the tool bolts and even the phenomenon of the knife is collectively referred to as the bolt is gradually serious, accounting for 23.56 of the tool failure, resulting in the tool The main reasons for the bolts are the repeated use of the tool brackets and the tool holders, so that a considerable part of the mating surface is deformed into a stepped shape, and at the same time the number of repairs is too many, so that the two brackets of the knife are not on the same conical surface. The cutters and tool bolts are used repeatedly and the thread damage is serious. Because the mating surface of the bracket and the tool holder is a conical surface, the tool is not in the installation process and the mating surface is not completely combined; the tool is in the process of installation. Not all the mating surface bracket holder threads and flat washers are cleaned, and the tool is asked to bolt in the process of driving; because of the operation, all the bolts of the tool have not reached the specified preload 805.
Wang Zhenchun, in charge of tool replacement in construction of Qinling 181, 726309, China Railway Tunnel, Qingyouhe Township, Shangnan County, Shaanxi Province, the company burned; effectively solved the hypoxia. For summer temperatures in desert areas, the aircraft increased the cooling area of ​​the cooling system. At the same time, a streamlined fully-closed cab and dual-system air conditioners were adopted to suit the harsh working environment. The toggle control system adopted by this machine is more in line with the ergonomic design requirements, making the operation more convenient and labor-saving.
After the machine and another product. The successful development of this machine realized the upgrading of West Excavator excavator products and enhanced the comprehensive strength and market competitiveness of the West Excavation Plant.
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