RU2531658C2 - Caterpillar tread of rock-drilling machine - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: invention relates to mining industry, and namely to self-propelled rock-drilling machines used for drilling of blast holes in open pits. A caterpillar tread of a rock-drilling machine includes a cast supporting plate with internal and external eye lugs. On outer surface of the supporting plate there are grousers, and on its inner surface there is a raceway and a traction grip hook, the symmetry axis of which coincides with the symmetry axis of the supporting plate. On outer surface of the supporting plate there is also an unloading component in the form of a slot on outer surface of the supporting plate under the internal eye lug symmetrically to the symmetry axis of a longitudinal plate for elimination of concentration of stresses in the internal eye lug, which occur after casting at manufacture of the supporting plate. At movement of a caterpillar truck wheel along the raceway, no wall deflection occurs.

EFFECT: achieving increase of carrying capacity of a structure without any increase of its metal consumption.

6 dwg

Description

The invention relates to the mining industry, namely to self-propelled drilling rigs used for drilling blast holes in quarries.

A track link of a commercially available drilling machine SBSH-250MNA is known, including a cast base plate with internal and external eyes, located on its outer surface of the lug, and on the inside there is a raceway and traction hook, the axis of symmetry of which coincides with the axis of symmetry of the base plate, and unloading element to eliminate stress concentration in the inner eye [1].

When casting a base plate to eliminate stress concentrations that arise due to shrinkage of shells, cracks, foreign inclusions, in the most vulnerable place of the link - at the junction with another link, in the inner eye, an unloading element is made in the form of an oval-shaped cavity. At the same time, the wall thickness under the raceway is reduced by half, and when the roller moves along the track, the roller of the undercarriage “subsides”, which leads when the drilling rig moves with the mast raised from the well to the well, to the swings and vibrations of the mast, and therefore to additional loads on the metal structure of the machine.

This in turn leads to a decrease in the durability of the equipment and an increase in the cost of its restoration. An increase in the wall thickness leads to an increase in the metal consumption of the manufacturing unit.

The result, which this technical solution is aimed at, is to increase the reliability and carrying capacity of the caterpillar track without changing its metal consumption.

This result is achieved due to the fact that the caterpillar link of the drilling rig, which includes a cast base plate with internal and external eyes, is located on its outer surface of the lug, and on the inside there is a raceway and traction hook, the axis of symmetry of which coincides with the axis of symmetry of the base plate , and a discharge element to eliminate stress concentration in the inner eye, its discharge element is made in the form of a groove on the outer surface of the base plate under the inner eye, symmetrically to the axis etrii longitudinal plates.

Figure 1, presents the design of the proposed technical solution, top view, figure 2 is the same, bottom view, figure 3 is a section aa, figure 4 is the interaction of the wheels of the undercarriage with the treadmill, figure 5 -6 - adopted as a prototype of the known design, respectively, the bottom view and section BB.

The caterpillar link of the drilling rig includes a cast base plate 1 with inner 2 and outer 3 eyes.

Lugs 4 are made on the outer surface of the base plate, and on the inner surface there is a raceway 5 and a traction hook 6, the axis of symmetry 7 of which coincides with the axis of symmetry of the base plate.

On the outer surface of the base plate, an unloading element 8 is also made in the form of a groove on the outer surface of the base plate under the inner eye, symmetrically to the axis of symmetry 7 of the longitudinal plate to eliminate the concentration of stresses in the inner eye that arise after casting during the manufacture of the base plate.

When the roller 9 of the caterpillar truck 10 moves along the raceway 5 with this technical solution, the wall 11 does not bend, as happened in the prototype shown in FIGS. 5-6, which led to the appearance of fatigue stresses in the wall 12, which led to the destruction of the structure . Moreover, the thickness h of the wall 11 in the proposed technical solution is equal to the total thickness h1 and h2 of the walls 12, 13 of the previous design with the unloading element 14, which allows to increase the load capacity of the structure without increasing its metal consumption and eliminate the “subsidence” of the roller 9 of the tracked truck 10. This eliminates the impact of additional loads on the metal structure of the machine.

Thus, this technical solution will allow:

- increase the reliability and durability of the structure;

- increase the carrying capacity of the link of the caterpillar track, and therefore the caterpillar track itself without increasing its metal consumption.

Information sources

1. OJSC “Rudgormash”. SBSh-250MNA machine, drawing track link (amend. 11) 188-01.01.1500, 2007

Claims (1)

The caterpillar link of the drilling rig, including a cast base plate with internal and external eyes, located on its outer surface of the lug, and on the inside there is a raceway and traction hook, the axis of symmetry of which coincides with the axis of symmetry of the base plate, and an unloading element to eliminate stress concentration in the inner eye, characterized in that the discharge element is made in the form of a groove on the outer surface of the base plate under the inner eye symmetrically to the axis of symmetry of the longitudinal plate.

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