Mining or in situ disintegration of hard material – Hard material disintegrating machines – With mine roof-supporting means
Patent
1990-06-23
1991-12-17
Bagnell, David J.
Mining or in situ disintegration of hard material
Hard material disintegrating machines
With mine roof-supporting means
299 56, 405141, F21D 908
Patent
active
050729926
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the mining industry, construction and transport, and more particularly it relates to shield units.
The present invention can find most efficient application in mining, tunnelling, coal chuting, as well as in driving workings for switchgears and power plants.
2. Description of the Related Art
There is known a shield unit (SU, A, 1229354), comprising a cylindrical shell made up of two sections (head section and tail section) arranged in succession one after the other which are connected by means of a traversing mechanism, the head section being provided with a cutting tool, its outer portion having a helical surface, and the tail section being outfitted with a device preventing its rotation in rock. The tail section of the shield unit consists of two parts, the first one serving as a support in case the head section turns or moves and the second one serving as a support in case the first part of the tail section turns or moves. A helical surface is provided on the outer portion of the tail section. The traversing mechanism includes two groups of double-action hydraulic jacks. The first group of hydraulic jacks is used for turning and axial movement of the head section relative to the tail section. The second group of hydraulic jacks is used for turning and axial movement of the first part of the tail section relative to its second part. Each hydraulic jack is in fact a cylinder with a piston and a rod. The cylinders of hydraulic jacks of the first group are hinged to the inner surface of the first part of the tail section and their rods are hinged to the inner surface of the head section. The cylinders of hydraulic jacks of the second group are hinged to the inner surface of the second part of the tail section and their rods are hinged to the inner surface of the first part of the tail section. The device preventing rotation of the tail section includes two groups of double-action hydraulic jacks positioned in the first and second parts of the tail section, each part accommodating one group of the hydraulic jacks. The cylinders of these hydraulic jacks are hinged to the inner surface of the tail section and their rods are hinged to plates. One end of each plate is hinged to the inner surface of the tail section, while its other free end passes through a hole in the tail section to come into contact with rock. A provision is made for a rock discharge mechanism, which is in fact blades positioned radially about the geometric axis of the cylindrical shell and rigidly fixed to the cutting tool of the head section. The rock discharge mechanism is also provided with haulage facilities of any known type, say, cars.
During operation fluid is fed to the head ends of the hydraulic jack cylinders of the device preventing the tail section from rotating. The rods of these hydraulic jacks are hence brought forward to move the plates. The free ends of the plates pass through the holes in the tail section to come into contact with rock, thus ensuring that the tail section is firmly fixed in rock. Then the fluid is fed to the head ends of the hydraulic jack cylinders of the traversing mechanism for turning the head section relative to the first part of the tail section. As a result, the rods of these hydraulic jacks are brought forward, thereby turning the head section relative to the tail section. At the same time the head section moves along the axis of the cylindrical shell due to the helical surface provided on the outer portion of the head section. With the head section turning and moving axially at the same time, the cutting tool performs effective operation in rock. Disintegrated rock is picked up by the blades in the lower part of the head section and loaded into a haulage facility, such as a car inside the head section in its upper part. Then the fluid is fed to the rod ends of the first group of the hydraulic jack cylinders of the device preventing rotation of the tail section in rock. As a result, the first part of the tail sec
REFERENCES:
patent: 3989303 (1976-11-01), Akkerman
Axenov Vladimir V.
Eller ALexandr F.
Gorbunov Valery F.
Nagorny Vladimir D.
Tkachenko ALexandr Y.
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