Mining or in situ disintegration of hard material – Hard material disintegrating machines – Sidewall-working
Patent
1988-03-30
1989-07-04
Massie, Jerome W.
Mining or in situ disintegration of hard material
Hard material disintegrating machines
Sidewall-working
105 291, E21C 2902
Patent
active
048445487
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to mining machines and more particularly to haulage units of coal-getting machines.
PRIOR ART
Known to the prior art is a coal-getting machine haulage unit (SU, A, 576,815), comprising a drive, an output shaft of which is kinematically associated with a conveyor, and at least two grips installed at a definite distance from each other and secured on the drive housing.
The kinematic linkage incorporates a sprocket installed on the output shaft of the drive and meshing elements coming in mesh with the sprocket teeth. The meshing elements made in the form of pins are installed for rotation about an axis thereof and for a limited longitudinal displacement in a guide. The guide is made tubular in shape and is essentially presented by links articulated with one another. Each link is installed on a carrying element secured on the conveyor. Each grip cooperates with each link of the guide. One grip is disposed in the zone where a sprocket tooth cooperates with the meshing element.
End faces of the pins are provided with projections made in the form of hemispheres and disposed outside the guide.
In comparison with widely known haulage units of coal-getting machines in which the meshing elements are fixedly installed in the guide, the known haulage unit of the coal-getting machine has a comparatively high hauling efficiency and features reliable and durable operation. However a small diameter of the pins limits the hauling capacity and friction of the grips on the guides cuts down the hauling efficiency.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide a haulage unit of a coal-getting machine featuring such kinematic linkage elements and their interconnection that would ensure high hauling capacities and efficiency of the machine and reduce large overall dimensions of the unit.
These and other objects of the invention are accomplished by that in a haulage unit of a coal-getting machine, comprising a drive having an output shaft of which is associated with a conveyor through the medium of a kinematic linkage incorporating a sprocket installed on the output shaft, meashing elements coming in mesh with teeth of the sprocket and installed for rotation about their axis and for a limited longitudinal displacement in a guide which is essentially presented by articulated links, each of which is installed on a carrying element secured on the conveyor, and at least two grips installed at a definite distance from each other, secured on the drive and cooperating with each link of the guide, one grip being disposed in the zone where a sprocket tooth cooperates with the meshing element, according to the invention, each link of the guide is made up of two arcuate elements facing each other by concave portions thereof and connected in a diametrical plane by means of at least two fastening members so that a clearance is formed between the arcuate elements, and each fastening member mounts a meshing element made in the form of a rolling body.
To provide a constant distance between the axis of the guide and the axis of rotation of the sprocket, it is desirable that rests should be made on the internal surface of the guide and disposed on both sides of the guide axis.
Such a design embodiment improves an accuracy in the meshing, reduces the losses in the meshing elements and minimizes the friction between the grip and the guide.
The surface of the body of rolling cooperating with a sprocket tooth may advantageously be made spherical in shape.
This will make it possible to maintain a constant meshing when a need arises for changing the angle of inclination of the drive output shaft.
It is preferred to dispose a bushing with a shoulder on the end face thereof between the fastening member and a respective rolling body so that the rolling body should embrace the bushing and rest on the shoulder.
Such a design embodiment allows the rolling body to align itself in a position ensuring the constant meshing with a sprocket tooth.
The proposed haulage unit of the
REFERENCES:
patent: 4025120 (1977-05-01), Balinov et al.
patent: 4055367 (1977-10-01), Jarvis
patent: 4088370 (1978-05-01), Jarvis et al.
patent: 4357052 (1982-11-01), Pilarski et al.
Polish Technical Review "Chainless Shearer--Loader Haulage System", vol. 136, No. 2, (1981), p. 22.
Masovich Felix Z.
Osokin Jury I.
Pukis Alexandr A.
Shishlov Vyacheslav I.
Stepanov Nikolai I.
Bagnell David J.
Gosudarstvenny Proektno-Konstruktorsky I Experimentalny Institut
Massie Jerome W.
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