Rotary bearing flange of portal jib crane

Abstract

The invention relates to a rotary bearing flange of a portal jib crane of a large-diameter rotary supporting bearing which is made by combining and utilizing the traditional metal processing skillfully. The technical scheme is as follows: the rotary bearing flange of the portal jib crane comprises a flange and a cylinder, and toggle plates are uniformly arranged at intervals on the flange and a transitional cylinder; the flange and the cylinder are welded together; and the flange is manufactured in the following steps: a bar is forged into a square blank with allowance and is then transferred to a machine after heat treatment, rough metal processing is carried out, and then the blank is pressed into required equally-divided ring blocks by an oil press, then the allowance is cut and chamfering is carried out, ground sample assembly is done on a platform, then the ring blocks are butt-welded into a ring, and then fine finishing is carried out on the ring until the flange of the given size is obtained. The rotary bearing flange of the portal jib crane has the beneficial effects of easy manufacturing, high yield and low cost.

Description

[0001] technical field [0002] The invention relates to a slewing support bearing of a gantry crane, in particular to a slewing bearing flange of a slewing bearing of a gantry crane which is a large-diameter slewing bearing produced by ingeniously combining traditional metal processing. [0003] Background technique [0004] The slewing action of the gantry crane, taking the ship as an example, is realized by the slewing bearing. The gantry crane with a larger tonnage usually uses a thrust bearing at the bottom and a slewing roller frame on the top to realize the stability of the slewing. Portal cranes with smaller tonnages use slewing ring bearings, and the diameter of the bearings is mostly less than 2.5 meters. [0005] At present, due to the advancement of technology, there are larger three-row roller slewing ring bearings, the largest of which has reached a diameter of more than 7 meters. , but the production technology of the slewing bearing flange used for the conn...

AI Technical Summary

Problems solved by technology

[0005] At present, due to the advancement of technology, there are larger three-row roller slewing ring bearings, the largest of which has reached a diameter of more than 7 meters. , but the production technology of the slewing bearing flange used for the connection of the three-row roller bearing still uses the original production process, that is, the casting method

[0006] If the diameter is large, the casting tooling mold is very large, especially the slewing bearing flange with a diameter of 7 meters. The slewing bearing flange not only has a thickness of about 150 mm, but also a flange panel width of about 300 mm. One flange, and it is quite difficult to ensure the quality. Due to the high cost, it hinders the application of large slewing support bearings on large-tonnage portal cranes

[0007] In this context, the inventor needs to make two new 40-ton portal cranes for his own use. If the portal cranes use slewing support bearings, their diameters will be close to 5 meters to meet the supporting force requirements. The corresponding connecting flanges The thickness of the flange also reaches 140 mm, and the width of the flange panel reaches 280 mm. If the traditional casting technology is used, the cost is very high, and the quality is not easy to guarantee at one time. Faced with this situation, consider using welding to solve this problem. Difficult problem. If the lower ring of the steel plate with a thickness of 150 mm is used as the flange blank, it is also difficult to order a steel plate with a thickness of 150 mm. Not only is it difficult to roll a thick plate, but it is also difficult to guarantee the mechanical properties of such a thick steel plate.

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