For heavy machinery, nothing is more fascinating than crawler cranes. In the construction, shipbuilding, and mining industries, crawler cranes are the force behind many projects.
Replacing and repairing the crawler crane undercarriage parts is a considerable expense for the owners. Under normal circumstances, a major repair or replacement of the crane undercarriage is required every year or every two years. We all know that the track shoe is the most vulnerable part among all the undercarriage parts, and do you know the wear pattern of track shoes?
In normal operation, the track pin slowly rotates backward in the hole, when the two wear evenly, the hole gradually becomes larger and the pin becomes thinner.
If the operation is improper, such as high-speed turning, sudden start, or muddy water, weeds, etc., causing the pins to be blocked, both sides of the track shoe will bend and sag under excessive pressure, then the pins will deform and bend, and they cannot be in the hole. Turning, the pin and the pin become sliding friction, and the friction part is limited to a small part of the contact surface, the pin is gradually ground into a bent shape, and the hole also becomes an oval shape.
The enlarged hole causes the track pitch to be longer (the pitch is the center distance between the holes at both ends of the track shoe), so the track shoe and the drive wheel gnaw each other, the track shoe is worn through, and the drive wheel teeth are knife-edged. According to the measurement, when the pitch is changed from 174 mm to 184 mm, the opening width of the drive wheel teeth changes from 87 mm to 97 mm. At this time, the normal rolling engagement is completely destroyed.
As the track shoe pitch is elongated, it also causes the support wheels to jump when walking, which accelerates the wear of the track shoe track. When the runway is more than 4 mm, it should be repaired. The wear of the guide part of the track shoe is mainly caused by the track deviation, the serious deformation of the track shoe, and the excessive axial shaking of the supporting wheel and the guide wheel. Common scrapped track shoes are severely worn or worn out at the meshing part with the driving wheel.
After understanding how the track shoe wears, and then let’s summarize a few undercarriage repair skills.
Top of the list, the undercarriages of the crawler crane is basically the same as that of the excavator and bulldozer, just due to the different shape of the crawler shoe, there are some differences in the planning and installation of the four rollers;
Second, most of the crawler track pads of crawler cranes are connected by pins, so the pitch of the track pads is very important. If the planning is not good, the equipment will not run during operation, and it will appear to be knocked. The phenomenon, and will make the board wear quickly, reduce the service life of the board, and increase the repair cost of the equipment;
Third, the four-wheel position of the crawler crane should be consistent with the shape of the crawler shoe. If the wheel gap is smaller than the wedge shape of the plate, then the wear of the wheel gap will be accelerated during the rolling process of the crawler track shoe, and the roller’s wear will be reduced. Use cycle
Finally, the repair of crawler cranes is basically the same as excavators and bulldozers, but because of the heavier weight, large lifting equipment must be available nearby.
In order to save the cost of replacing the chassis, we recommend that the owner check the chassis regularly to solve minor problems to avoid joint damage to other accessories.
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