SEVENCRANE za stranke rešuje problem glodanja tirnic mostnega žerjava/dvigala

 17. oktober 2019

SEVENCRANE received inquiries about the crane wheels and crane rails of bridge crane/overhead crane. The customer purchased the overhead crane from other supplier before, but found that the crane rails and wheels of the crane were damaged seriously soon after use, which affected the production and use and caused a great loss. SEVENCRANE explained the reason for the damage to the customer after knowing and investigating the actual situation of the customer's crane. The phenomenon of overhead crane rail gnawing is partly due to the poor quality and partly due to the objective factors of improper use.

SEVENCRANE provided our customers with high quality crane wheels and crane rails and systematically trained them in proper use and maintenance of bridge cranes. Many customers expressed their gratitude and praise to SEVENCRANE and signed long-term cooperation agreements.

In order to help customers reduce the risk of downtime due to rail gnawing of bridge cranes, reduce losses and maintenance costs, SEVENCRANE specially sorted out the Reasons for rail gnawing of overhead cranes for customers to read and learn.

Reasons for rail gnawing of overhead cranes

1. Crane wheel impact.

First, due to manufacturing errors, uneven wear and tear, and unilateral replacement during maintenance, the diameters of wheels on both sides are unequal. When running at the same speed, the journeys on both sides are unequal, and the side with large diameters will advance gradually, resulting in asynchrony, which causes the body to skew and gnaw the rails. Second, the installation position of the four wheels is not at the four corners of the rectangle, and the center of the wheels on the same side is not in a straight line, which forms the deflection of the centerline of the wheels and causes rail gnawing.

2. Rail impact.

First, because the track laying is not standard, the horizontal bending is too large and the straightness error is more than 2 mm, which results in the gnawing of the fixed track segment.

Second, the track gauge is too large, the outer wheel edge gnaws the rail; conversely, the inner wheel edge gnaws the rail.

Thirdly, the vertical height difference between the treads on the same section of the two tracks is more than 15 mm, which causes the sideslip of the cart and rails gnawing.

Fourth, the parallelism of the two tracks is excessive, forming an "eight-character" or trumpet-shaped, causing rail gnawing.

Fifth, the track foundation is not solid, and when loaded, it will sink, resulting in rail gnawing.

3. Crane bridge deformation impact.

First, the deformations of the bridge frame cause the horizontal bending of the end beam. When the diagonal length exceeds 5 mm or more, it causes the span to exceed the difference. If it is positive, it gnaws the inner rim of the wheel; on the contrary, it gnaws the outer rim of the wheel.

Secondly, the horizontal bending of the end beam causes the wheel to deviate horizontally, so that the centerline of the wheel and the centerline of the track are not in a straight line, forming the same deviation and causing rail gnawing.

Thirdly, the vertical deflection of the bridge frame causes the vertical deflection of the wheel, which causes the angle between the tread centerline and the vertical line, changes the rolling radius of the wheel. After loading, the vertical deflection of one side of the wheel increases gradually, while the vertical deflection of the other side decreases, resulting in different rolling radius, resulting in rail gnawing.

4. The different speed of two motors or the different adjustment of the clearance between the two brakes in the running mechanism of the crane cart driven separately result in the different braking moment and step, which results in rail gnawing.

5. The gap between the two ends of the coupling of the transmission mechanism is too large, which causes that the wheels can’t be driven at the same time and causes rail gnawing.

6. Oil or debris on the track tread may cause the wheel running at different speeds on both sides, which may also lead to rail gnawing.

Products you may be interested in

spodnji eot žerjav — https://www.sevencrane.com/product/european-type-single-girder-overhead-crane/

32T mostni žerjav — https://www.sevencrane.com/product/european-type-single-girder-overhead-crane/