The construction machinery is back to the support due to the material pores or interlayers, the hardness and depth of the raceway hardened layer, and other manufacturing quality problems or some external reasons, causing the hardened layer of the raceway to peel off or the teeth of the ring gear will make the equipment not be normal. jobs.
For the raceway stripping, we must first make a correct judgment. Peeling occurs and is generally not easily visible on the outside. According to our experience, when the following situation occurs in the south, it is indicated that the raceway has peeling: When the main machine is loaded with rotation, there is a “slightly-reckless” noise in the raceway, and the rotation speed is uneven or the speed of a certain position slows down significantly. There is slight vibration; the temperature rise of the slewing motor is too high or the current is too large; the keyways of the slewing electric motor and the hydraulic coupling or the coupling are smashed.
After peeling occurs, it must be repaired in time. Otherwise, the area of the stripping layer will be enlarged, so that the entire slewing ring will be scrapped.
The repair method is: first take out the roller or steel ball in the slewing bearing to separate the inner and outer rings; clean the raceway with gasoline; then use the grinding machine (grinding wheel) carefully and carefully. The hardened layer of the cracks generated around it is ground off, and the bottom of the stripping layer is ground flat; the welding place of the raceway needs to be repaired with a welding torch, and the middle carbon steel electrode is used for welding (the electrode must be dried before use, and Bake and use), to make the welding layer slightly higher than the surface of the raceway 1-2mm; if the stripping depth is deep or the area is large, it should be welded in layers, do not cause the base metal temperature is too high to cause deformation; this avoids Rapid cooling generates welding cracks. Immediately after welding, insulation measures should be taken to allow him to cool gradually. After cooling, use a grinding machine to polish the repair welding layer so that it is slightly higher than the surface of the raceway. Gradually grind the repair welding surface with whetstone or metallographic abrasive cloth to make it match the height of the normal surface of the raceway and use the corresponding original curvature. Sample testing until it is qualified; use gasoline to clean the raceway and roller (steel ball) grease, assembly into one can be completed.
According to the above method, the slewing ring of a tower crane and other equipment is conveniently operated after long-term use.
The reason for the broken tooth of the slewing gear ring may be that the quality of the casting section of the gear tooth base material (such as blisters, interlayers, etc., and the anti-bending effect of the gear is significantly weakened); in the use of the gear tooth embedded in the stone or steel reinforcement Hard objects increase the local bending stress of the teeth and break them.
The repair method is partial repair welding or insert repair. The method of partial repair welding is to first remove the residual crack matrix of the damaged part with a hand-held grinding wheel, clean it with gasoline (oil), and preheat it with a welding torch. When a certain temperature is reached, a medium-carbon steel electrode is used to push out the tooth prototype at the damaged position of the gear tooth, making it 1-2 mm higher than the tooth surface of the party; an experienced mechanic repairman is selected and tested according to the tooth profile model. Until the tooth meets the requirements.
When a whole tooth of the slewing ring is damaged, it can be cut along the root of the tooth, and then the tooth root is twisted into a certain shape, as shown in FIG. 1 . After the teeth are cut and stored on the same kind of used old gear ring, they are machined into the shape corresponding to the parent material, placed in the groove, and locked with the toothed template. In order to ensure the consistency of the tooth pitch, and use the double-threaded chuck to increase the value, the low-carbon steel is welded around the teeth. Finally, use a trowel and other tools to flatten the weld to ensure that the meshing of the gear teeth is stable. Slewing ring peeling
The construction machinery is back to the support due to the material pores or interlayers, the hardness and depth of the raceway hardened layer, and other manufacturing quality problems or some external reasons, causing the hardened layer of the raceway to peel off or the teeth of the ring gear will make the equipment not be normal. jobs.
For the raceway stripping, we must first make a correct judgment. Peeling occurs and is generally not easily visible on the outside. According to our experience, when the following situation occurs in the south, it is indicated that the raceway has peeling: When the main machine is loaded with rotation, there is a “slightly-reckless” noise in the raceway, and the rotation speed is uneven or the speed of a certain position slows down significantly. There is slight vibration; the temperature rise of the slewing motor is too high or the current is too large; the keyways of the slewing electric motor and the hydraulic coupling or the coupling are smashed.
After peeling occurs, it must be repaired in time. Otherwise, the area of the stripping layer will be enlarged, so that the entire slewing ring will be scrapped.
The repair method is: first take out the roller or steel ball in the slewing bearing to separate the inner and outer rings; clean the raceway with gasoline; then use the grinding machine (grinding wheel) carefully and carefully. The hardened layer of the cracks generated around it is ground off, and the bottom of the stripping layer is ground flat; the welding place of the raceway needs to be repaired with a welding torch, and the middle carbon steel electrode is used for welding (the electrode must be dried before use, and Bake and use), to make the welding layer slightly higher than the surface of the raceway 1-2mm; if the stripping depth is deep or the area is large, it should be welded in layers, do not cause the base metal temperature is too high to cause deformation; this avoids Rapid cooling generates welding cracks. Immediately after welding, insulation measures should be taken to allow him to cool gradually. After cooling, use a grinding machine to polish the repair welding layer so that it is slightly higher than the surface of the raceway. Gradually grind the repair welding surface with whetstone or metallographic abrasive cloth to make it match the height of the normal surface of the raceway and use the corresponding original curvature. Sample testing until it is qualified; use gasoline to clean the raceway and roller (steel ball) grease, assembly into one can be completed.
According to the above method, the slewing ring of a tower crane and other equipment is conveniently operated after long-term use.
The reason for the broken tooth of the slewing gear ring may be that the quality of the casting section of the gear tooth base material (such as blisters, interlayers, etc., and the anti-bending effect of the gear is significantly weakened); in the use of the gear tooth embedded in the stone or steel reinforcement Hard objects increase the local bending stress of the teeth and break them.
The repair method is partial repair welding or insert repair. The method of partial repair welding is to first remove the residual crack matrix of the damaged part with a hand-held grinding wheel, clean it with gasoline (oil), and preheat it with a welding torch. When a certain temperature is reached, a medium-carbon steel electrode is used to push out the tooth prototype at the damaged position of the gear tooth, making it 1-2 mm higher than the tooth surface of the party; an experienced mechanic repairman is selected and tested according to the tooth profile model. Until the tooth meets the requirements.
When a whole tooth of the slewing ring is damaged, it can be cut along the root of the tooth, and then the tooth root is twisted into a certain shape, as shown in FIG. 1 . After the teeth are cut and stored on the same kind of used old gear ring, they are machined into the shape corresponding to the parent material, placed in the groove, and locked with the toothed template. In order to ensure the consistency of the tooth pitch, and use the double-threaded chuck to increase the value, the low-carbon steel is welded around the teeth. Finally, use a trowel and other tools to flatten the weld to ensure that the meshing of the gear teeth is stable.
