Patent EA-007235-B1 (EA)
Title: Pneumatic feeder (embodiment)
Inventor: DRONOV EVGENIY ANATOLIEVICH
IPC: E21B15/00
Filed: 2005-08-05
Abstract: The invention relates to the field of mining, specifically to the pneumatic feeders for rock drills. The invention is directed to improvement and buildup of performance capabilities as well as enhancement of reliability and usability. The technical result claimed is realized in such a way that the pneumatic feeder as to the first embodiment contains fastened to the foundation housing with tubular rod, one end of which has a piston fixed thereon and the other end of the rod protrudes beyond the housing and has a head installed thereon together with a fixture to secure the rock drill, and a compressed air distributor with channels to connect to delivery pipe, discharge pipe, cavity of the rod and cavity of the pipe, one end of which is rigidly fixed in the head and the second end of the pipe is arranged in the axial channel of piston, while the rod cavity is linked to the housing cavity by means of holes. Pneumatic feeder is provided with protective casing for retractable portion of the rod, the casing is kinematically connected with the housing and with at least one unit of rod fixing against turning-through, at the same time the protective casing is rigidly secured with its upper end-face onto the protruding end of the rod below the distributor and covers the outer surface of the pneumatic feeder housing all over the way of rod extension. As to the second embodiment of the pneumatic feeder, its housing and protective casing are both of telescopic design. The telescopic protective casing is made as an outer casing with its upper portion secured on the rod under the distributor, and at least one inner retractable casing with its upper portion secured on mating retractable housing or on the rod above the retractable housing fixing point. The telescopic protective casing has at least one unit of rod fixing against turning-through per each pair of mated protective casings and at least one such unit is provided to fix the inner casing with immoveable housing of pneumatic feeder. The unit of rod fixing against turning-through is made as a guide arranged over the outer surface of the housing along its axis or over the inner surface of the casing, and its mated groove being arranged respectively over the inner surface of the casing or outer surface of the housing. To reduce the dust level during used compressed air bleeding to the atmosphere and to reduce the noise level, the pneumatic feeder is additionally provided with at least one channel connected to the discharge pipe and made in the upper end-face of protective casing to deliver compressed air used by pneumatic feeder into the casing cavity, with the rod being extended, and at least one open channel made over the outer surface of the housing and/or inner surface of the casing, and/or clearance allowed between the bodies of casing and housing to bleed used compressed air into the atmosphere. The upper end-face of protective casing is built as a bush with annular inner channel for collection of used compressed air fed to the discharge pipe from the cavities of working and/or idling run of the rod, while the inner surface of the bush and the rod (on the side of the housing) produce annular slot to communicate with the annular channel and to provide moving direction of used compressed air from the annular channel along the extendable portion of the rod towards the housing, and the annular channel being connected to the discharge pipe via an additional channel or additional channels.