Repair and maintenance technology of metal structure parts of tower crane
Repair and maintenance technology of metal structure parts of tower crane
1. Strict implementation of Crane steel structure parts scrap standards.
2. The main structural parts should be inspected for metal fatigue strength, weld cracks, structural deformation, breakage, etc.. The key welds of the main structural parts and the parent materials in the welding heat affected area should be inspected. If abnormal conditions are found, they should be treated. Structures shall be inspected in accordance with the following procedures.
(A) Daily Inspection: The tower crane should undergo a daily inspection every 80 hours of work. The tower crane driver should check the fastening condition of the bolts at each connection site when handing over the shift. If there is any loosening, it should be fastened in time.
(B) When there is an abnormal sound or misoperation of the tower crane, or when the security protection device for the tower crane is found to have failed, it should be checked and recorded.
(C) When a project is completed and the tower hoist is dismantled, the opportunities in the tower hoist rental market should be examined in detail by engineers and professional maintenance personnel and recorded.
3. In the course of transportation, every effort should be made to prevent structural deformation and collision damage.
4. Brush paint every six months to a year. Rust, oil and other dirt on the metal surface should be removed before painting.
Importance of good maintenance of Crane parts
If the maintenance work of the tower crane parts is not done properly, the damage of one part may lead to the performance of the entire tower crane. based on the tower crane production and management experience, will be divided into two parts of the tower crane parts maintenance business, explaining the importance of the tower crane parts maintenance work.
Security checks
Tower cranes are inspected before and after installation and during daily use. These include: metal structure welding must not crack, metal structure must not be plastic deformation, the quality of the connecting bolts and pins meets the requirements, and measures to stop retreat and prevent loosening, connecting bolts must be regularly pre-arranged by personnel, steel wire rope lubrication is well maintained, and the number of broken wires must not exceed the standard.
No disjoint shall be allowed, no plastic deformation shall be allowed, the tether joint shall conform to the standard, no oil leakage shall be allowed to the speed box and the cylinder, the pressure of the hydraulic system shall be normal, the brake brake and the limit insurance shall be sensitive and reliable, the transmission mechanism shall be well lubricated, the safety device shall be complete and reliable, and the electrical control line shall be well insulated.
In particular, it is necessary to urge tower hoists, maintenance electricians and mechanical maintenance workers to carry out regular inspections, and to pay attention to the inspection of steel wire ropes, hooks, various transmission parts, limited-position insurance devices and other vulnerable parts, and to immediately deal with the problems, so as to determine the person, set the time and set the measures. Strictly eliminate mechanical disease operations.
Replacement of faulty parts
It is inevitable that there will be no "work damage" after the parts of the tower crane are exposed to the sun and rain for a long time. At this point, the replacement of faulty parts has become a top priority. When replacing the tower crane parts, special personnel must be operated, and must stop operation.
During downtime, it is not easy to map and carry a load, and the ground should also be designated as a safe area, idle people and so on are not allowed to enter. When replacing important parts or major repairs, the tower crane should also be removed first.
