RU2524739C1 - Mine excavator rotary support - Google Patents

Abstract

FIELD: transport.SUBSTANCE: proposed device is composed of roller turn table with symmetric circular thrust guides. Lower guide is mounted at running gear lower frame. Upper guide is arranged at turn table lower belt. Rails with support surface are arranged at said circuit thrust guides. Taper rollers with cylindrical pins are arranged between said rails. Rollers are connected with cages, isolating inserts and washers. Lubricators are arranged at centres of axes on outer side of roller turn table. Diameter of thrust guides is comparable with lower frame width. Upper and lower rails are equipped with grooves for plates to be bolted thereto at circular guides. Flanges are made at taper roller inner ends. Edges of rail inner ends and mating flange surface are arc-shaped. Relationship between flange OD and maximum spacing between rail bearing surfaces ?1.1. Roller pins are elongated relative to said flange and outer ends. Aforesaid cage represents a circular shell arranged inside roller turn table. Axles are pinned to said cage. Gaskets are fitted between roller flange and circular shell. Washers are fitted on axles on outer side of rollers.EFFECT: uniform distribution of loads, better reparability.2 cl, 3 dwg

Description

The invention relates to mining excavators, and in particular to slewing devices, can also be used in hoists and excavating machines designed to move goods, develop and load vehicles or dump minerals.

A rotary support device for a mining excavator is known, comprising upper and lower rails, a roller circle, rollers, a gear ring and related parts that form a mechanical roller circle (Maintenance and repair manual for excavator mechanisms 2800XRB, P&N Mining Equipment - Technical Communications, 2002 Harnischfeger Corporation, p.3.22-3.33). The rotation motor drives the rotation shaft and the drive gear. The pinion gear meshes with the ring gear of rotation and rotates the upper frame on the undercarriage. The upper frame is supported on tapered rollers that roll along the machined upper and lower roller raceways. The rollers are tapered to ensure contact with the rails without slipping. The rollers are mounted on a circular cage on the fingers in the holes at equal distances around the carrier cage. During machine operation, the roller assembly moves between the upper and lower rails coated with atomized grease from the automatic lubrication system.

The disadvantage of the rotary device of the 2800ХРВ Р & Н excavator is the relatively small diameter of the roller circle and the limited number of rollers, which leads to high loads on its supporting surfaces, upper and lower rails and rollers, and therefore, operation of the excavator requires high-quality preparation of the bottom of the face with slope no more than 3 °.

A rotary support device according to the invention according to the invention of US patent No. 5205657 A, 04/27/1993, was selected as a prototype. The rotary support device includes a turntable with upper and lower annular guides, as well as external and internal separators. Each annular guide has a supporting surface, which are opposite one another and have a gap between them. A number of tapered rollers are in roller contact with the bearing surfaces of the guides, and each roller is mounted on a roller. An internal separator connects the ends of the rollers of adjacent rollers from the smaller ends of the rollers. The inner cage includes an element that is mounted on top of the side of the rail to transfer thrust loads from the rollers through the cage to the rail.

The invention also relates to such a turntable in which a second, external, separator connects opposite ends of the rollers of adjacent rollers and there are elements connecting the external separator to the internal separator so that persistent loads are transferred from the rollers to the external separator and through the connecting elements to the internal separator.

The use of two separators, external and internal, reduces the maintainability of the slewing ring and, therefore, the durability and reliability of the excavator.

The technical task of the invention is the creation of a reliable, evenly distributed loads, maintainable rotary support device of a career excavator in the form of an annular support by increasing the diameter of the ring guides relative to the lower frame of the excavator, as well as reducing the load directly on each roller.

The technical problem is solved by the implementation of the rotary support device in the form of a roller circle containing annular stop rails - the lower one, mounted on the lower frame of the undercarriage, and the upper one, located on the lower belt of the turntable, rails with bearing surfaces are installed on the ring guides, between which conical rollers with cylindrical axles. The axles of the rollers are connected to the separator, insulating liners and gaskets are installed on them, and lubricators are located in the center of each axis, on the outside of the roller circle.

The diameter of the thrust guides is commensurate with the width of the lower frame; the upper and lower rails are provided with grooves in which the strips are located, bolted to the ring guides. Flanges are made on the inner ends of the rollers, and the edges of the inner ends of the rails and the surface of the flanges mating with it are made arcuate. The ratio of the outer diameter of the flanges to the maximum distance between the bearing surfaces of the rails> 1.1 - The axes are elongated relative to the flanges and the outer ends of the rollers. The separator is an annular shell located inside the roller circle on which the axles are fixed with pins, gaskets are located between the flanges of the rollers and the ring shell, and washers are installed on the outside of the rollers.

The roller liners are made of molded polyamide containing a uniformly distributed solid lubricant.

The implementation of the rotary support device, in which the diameter of the thrust guides is commensurate with the width of the lower frame, allows you to create a uniform distribution of loads on the track frame by increasing the bearing area and the number of rollers.

The implementation of the separator in the form of an annular shell, which is placed inside the roller circle makes free access to its components - thus convenient to maintain and maintainable.

The fastening of the upper and lower rails, between the supporting surfaces of which tapered rollers are rolled, by means of strips fixed by bolts on the guides, ensures the stability of the slewing device, holds the rails in the horizontal and vertical plane and avoids crushing of the supporting surfaces due to local plastic deformations under the influence of vibration and shock loads, increases the reliability of the slewing ring.

Performing flanges on tapered rollers holds the rollers on the supporting surfaces, prevents their deformation and fatigue chipping in the form of shells and peeling under the action of alternating contact stresses. And the implementation of the width of the flanges satisfying the ratio of its outer diameter to the maximum distance between the supporting surfaces of the rails ≥1.1, allows you to hold the rollers on the supporting surfaces. The manufacture of the mating surfaces of the flanges and the edges of the rails arcuate, eliminates the possibility of stress concentration inherent in the edges and corners.

The gaskets mounted on the axis between the flange of the rollers and the separator eliminate contact between them and also protect the cage softer steel compared to the roller. In addition, since the thickness of the flange decreases with friction against the rails, by adjusting the width of the strip, it is possible to prevent distortions and deformations in the rails - roller - ring shell (separator) system.

In figures 1, 2 and 3 depicts a rotary support device General view, the turntable (bottom view) and in section, respectively.

Figure 1 shows a roller circle 1, symmetrical annular thrust guides 2 and 3, as well as a cage 4 in the form of an annular shell located inside the roller circle 1. The lower thrust guide 2 is mounted on the lower frame of the undercarriage 5, and the upper bearing guide 3, mounted on the lower belt of the turntable 6 (figure 2 and figure 3). On the ring thrust guides 2 and 3, rails 7 are installed, between the supporting surfaces of which there are conical rollers 8. In the rollers 8 there are cylindrical axes 9 with insulating liners 10. On the axles 9 between the conical rollers 8 and the separator 4 there are gaskets 11. Oilers 12 are installed in the centers of the axles 9 on the outer side of the roller circle 1. The lower support rail 2 is commensurate with the lower frame 5, and on the upper and lower rails 7 there are grooves 13 in which the slats 14 are mounted, bolted 15 on the ring guides 2 and 3. On the flanges are made in the morning ends of the tapered rollers 8. The inner edges of the rails 7 are arcuate, as well as the conjugated connection of the roller 8 to the flange 16. The axles 9 are mounted by studs 17 to the separator 4. On the axles 9 between the flange 16 of the roller 8 there are gaskets 11 and on the outside of the rollers 9 there are washers 18 that limit their radial movement.

The rotary support device operates as follows (Fig. 1, 2 and 3).

When the drive is running, the rotation drive gears, rolling around the ring gear (not shown in the figures), report the rotation of the thrust guide 3 mounted on the lower belt of the turntable. The rollers 8 roll along the supporting surface of the rail 7 mounted on the guide 2 and the lower frame 5. The conical rollers 8 absorb axial and radial loads, as well as the moment acting on the movable bearing guide 3.

The proposed rotary support device allows to obtain a uniform distribution of loads on the lower frame of the undercarriage, to avoid deformation and rolling of the bearing surfaces, as well as to facilitate access to components and mechanisms.

Claims (2)

1. The rotary support device of a career excavator, made in the form of a roller circle containing symmetrical annular thrust guides - the lower one mounted on the lower frame of the undercarriage and the upper one located on the lower belt of the turntable, rails with bearing surfaces are installed on the annular thrust guides, between which there are conical rollers with cylindrical axes connected to a separator, insulating liners and gaskets, located in the center of the axles on the outside of the roller circle us oiler, characterized in that the diameter of the guide thrust commensurate with the width of the lower frame; the upper and lower rails are provided with grooves in which the strips are located, bolted to the ring guides; flanges are made on the inner ends of the conical rollers, the edges of the inner ends of the rails and the surface of the flanges associated with it are arched, the ratio of the outer diameter of the flanges to the maximum distance between the bearing surfaces of the rails is ≥1.1; the axes are elongated relative to the flanges and the outer ends of the rollers, the separator is an annular shell located inside the roller circle on which the axles are fixed with pins, gaskets are located between the flange of the rollers and the ring shell, and washers are installed on the outside of the rollers on the axis. 2. The rotary support device of a mining excavator according to claim 1, characterized in that the roller liners are made of cast polyamide containing a uniformly distributed solid lubricant.

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