Main bearing of heading machine

Abstract

The invention provides a main bearing of a heading machine. The main bearing comprises an outer ring, an inner ring, a radial roller and a sealing ring, the outer ring is provided with an inner cavity used for installing the inner ring, the inner side wall of the inner cavity is of an arc structure, and a groove is formed in the inner cavity in the radial direction. The inner side wall of the outer ring is provided with a first arc-shaped section and a second arc-shaped section of which the curvature radius is greater than that of the outer side wall of the inner ring; the radial rollers are arranged in the grooves and are in contact with the outer side wall of the inner ring; and the sealing ring is arranged between the outer ring and the inner ring. According to the main bearing of the heading machine provided by the invention, the radial roller design is reserved, and the surface contact between the inner ring and the outer ring is used for bearing a load, so that the rigidity of the outer ring is increased, and the loaded deformation condition under an extreme working condition is improved; meanwhile, the continuously changing combined load of the main bearing in the operation process can be borne by adjusting the contact angle between the outer ring and the inner ring, the axial and radial bearing capacity of the main bearing is improved, and the operation flexibility of the main bearing is improved.

Description

technical field [0001] The invention relates to the technical field of roadheaders, in particular to a main bearing of a roadheader. Background technique [0002] Tunnel boring machine is a kind of engineering machinery specially used for tunnel excavation construction. In the process of underground construction, it breaks rocks and excavates to form a complete tunnel section. Tunnel construction equipment for operations. [0003] During the excavation process of the roadheader, the main bearing in the roadheader needs to bear the composite loads such as axial force, radial force and overturning moment, which is a typical low-speed heavy-duty bearing. During the operation of the main bearing, as its size increases, the load it bears also increases. Therefore, when it is necessary to increase the load-carrying capacity of the main bearing, it is necessary to increase the number of rollers and the width of the raceway. However, at present, the main bearings in roadheaders wi...

AI Technical Summary

Problems solved by technology

However, at present, the main bearings in roadheaders widely adopt a three-row three-row roller structure (specifically including inner rings, outer rings, raceways and rollers, etc.), increasing the number of rollers and the width of the raceways has the following problems : ①The increase of the width of the raceway means that the space between the inner ring and the outer ring of the main bearing also needs to be increased, which will easily lead to problems such as a decrease in rigidity and an increase in deformation of the outer ring and inner ring of the main bearing; ②At the same time, due to different There is uneven force on the rollers at the position, which easily increases the wear rate of the main bearing, and because the rollers have high processing accuracy requirements and a large number, the maintenance and processing costs of the main bearing are increased.

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