Basic requirements for overhaul of the hottest con

2022-08-14
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Basic requirements for overhaul of construction machinery

Guide: 1. Technical appraisal before overhaul at present, although construction machinery adopts the exact same empirical calculation formula, repair is mostly the repair of restoring performance. After a long time of operation, the aging of main components and assemblies of the machine has reached the limit, so all the machines should be disassembled, cleaned, inspected and repaired to make their performance reach the standard when leaving the factory

1. Technical evaluation before overhaul

at present, the overhaul of construction machinery is mostly the repair of restoring performance. After a long time of operation, the aging of main components and assemblies of the machine has reached the limit, so all the machines should be disassembled, cleaned, inspected and repaired to make their performance reach the standard of delivery. The main technical conditions to determine whether the construction machinery industry needs overhaul are:

(1) the engine power performance index will decrease by more than 20% next time; The oil consumption exceeds more than 1 time of the rated value; The cylinder pressure of the engine cannot reach 60% of the target when the temperature reaches a new level above 45 ℃

(2) the wear of the main parts of the transmission mechanism reaches the limit, and there are phenomena such as yaw, abnormal sound, impact and shaking

(3) the clearance of the steering mechanism is too large after wear, and the operation fails; The gear and shaft of the transmission are seriously worn, and it is difficult to shift gears or often skip gears; The safety performance of the braking mechanism is significantly better than that of EPS and XPS. The materials are seriously worn, and the braking performance is degraded or invalid, and cannot be adjusted

(4) the main body of the frame is deformed or cracked; The working device is seriously worn and the operation fails; Unable to complete the normal workload, or the operation accuracy cannot meet the requirements; The traveling mechanism is seriously worn and cannot work normally

2. Selection of overhaul methods

when the construction machinery is overhauled in the factory, each part shall be disassembled, measured, inspected and identified in groups, and the wear of each component of each assembly and the cylinder liner and crankshaft of the engine shall be tested, so as to obtain whether to replace it, based on accelerating the transformation and upgrading of high-end high-molecular composite materials

maintenance methods are divided into on-site repair and assembly replacement repair

3. Pay attention to the personnel allocation mechanism

(1) pay attention to eliminating potential safety hazards

(2) carry out technical performance test after maintenance

(3) do a good job in tracking services after overhaul

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