Return Weapon: five parts of construction machinery in the maintenance of skills - construction machinery, spare parts, maintenance - construction

Return Weapon: five parts of construction machinery in the maintenance of skills

- construction machinery, spare parts, maintenance - construction

1, deformation of the engine cylinder head repair

Our two KLD85Z Loader Kawasaki, Japan, the engine cylinder head due to the long work in high temperature, high pressure, heat load and cyclic load and the occurrence of warpage, head gasket washed out from the water crossing Office, resulting in burning chamber pressure drop, increase engine power shortage and the radiator outlet coming out of the water. Two consecutive cylinder changed his pads, the use of one month after they are washed out. Dismantling the unit and found that cylinder block, cylinder heads are deformed. Cylinder of flatness error of 50 m, also meet the technical requirements, but the cylinder head flatness error is to 0.20mm, the gasket deformation was the main reason being washed. We use the repair method, because no combustion chamber concave cover machine, do not take into account changes in volume combustion (combustion chamber volume changes in value generally should not exceed 4% of the original volume), using the method for face milling processing of the cylinder head surface; in the cylinder head and cylinder block joint surface of the water crossing to install a copper pad (the thickness of the copper pad concave platform for water crossing the thickness of 1.2 times), instead of the rubber pad cylinder seals, and then install the cylinder head gasket at the same time with the first post-cold-hot tight tight solid cylinder head bolts approach. Using this method, the engine repair, and then does not appear overshoot cylinder head gasket failure.

2, dry the emergency repair of thin-walled cylinder

My company a Komatsu WA420 Loader, due to long-term work in the field, the engine cooling water containing minerals using more filters in addition to the cooling system to maintain oversight, the engine crankcase cylinder took place in Point II loss, while making thin-walled cylinder is also cavitation, there 2mm sized holes, leading to the crankcase sump water. Taking into account the machine equipment purchased in 1992, the engine crankshaft, camshaft and cylinder at or near the use limit, significant spending is no longer worth repairing, but the engine cylinder and piston wear still comply with standard, no burning oil and the black smoke emission, and the engine is working properly, no significant increase in fuel consumption, hydraulic system and chassis parts can continue to use, and significantly higher than similar China-made mechanical efficiency. To this end, we will turn around 180 degrees the original cylinder and cavitation in the crankshaft box office block with AB glue, then re-assemble the engine, run the show once again working properly. With this lesson, later working. With this lesson in the later work, management and maintenance staff are very great importance to the maintenance of cooling water filters. Repair has been one year since the aircraft still in use.

3, bulldozers, welding repair station frame

SH320-type bulldozer after 6 years of use, sets the frame due to the long moment and torque in different directions by the role of the two bracket bolts to break, plus they did not discover, leading to rupture from Taiwan frame arm into two sections. Difficult to repair as the same time, even if the purchase of the old pieces that have to more than 10,000 yuan, for which we decided to use welding to repair. In practice, the first broken bolt in accordance with the status quo will be installed on the platform frame assembly is good, will crack the first spot to live, then remove and back to the shop, stand erect with a 30cm, 1m in the context of the surrounding cracks increases with charcoal temperature (to prevent local heat distortion), to reach about 120 , and then use acetylene gas cutting a V-shaped groove to groove depth of arm-thick 3 / 4, then the implementation of welding. Welding process is as follows: DC arc welding machine, reverse method (welding pieces connected with negative), J507 electrode (using pre-heated to 100 ), electrode diameter 3.2mm, from the arc welding current situation under the regulation. After welding to eliminate stress (heated to 200-300 annealing), and for grinding treatment. Installed after welding good use that the quality of full compliance with requirements. The machine has been used for 10 months, working properly.

4, dynamic loading mechanism of the processing piston cylinder repair

Loader on dual-pipeline gas over hydraulic brake booster system, my company a KLD85Z Loader also used this kind of braking system. As the long-term use, a brake booster in the course of a sudden failure, checking their fault because: a long time booster hydraulic cylinder by brake fluid corrosion cavity arising Ma, leading to wear and failure of rubber cups. After inquiry, the product no domestic parts, import price of 12,000 yuan. Obviously, if the purchase is economically viable. We found BJ2020-type jeep clutch bag repair rubber cups and cups the size of this machine is similar, but slightly smaller diameter. After further analysis of the piston cavity size that the lathe can be used in this document completely; by rapid processing of small amount of feed to reduce the roughness of cavity; adjust the knife into the knife 2-3 degrees, so that inner wall of a certain pitch; diameter in size and be under the cups, and small size than the original 0.4-0.5mm. After careful measurement process, after the repair can be used normally.

5, T815 Dump Truck Repair welding consumable

My company has produced T815 model from the Czech Republic a total of 30 tanker units, the use of a few years found the car chassis as part of localization, the chassis construction quality can not meet the requirements of frequent occurrence in certain parts of malignant fracture, to users of the tremendous economic losses. After a long journey, the vulnerability of our aircraft parts (such as steel plate lug, steel clamp, spring plate and bushing, etc.) the welding repair, and achieved good results. In Shi welding Note: DC arc welding machine, J506 electrodes, welding preheat and post weld heat, eliminating the local thermal stress, prevent stress concentration.

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