# US 5,346,186 A · Nozzle guard for blast furnace mudgun > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,346,186 A - Document ID: US5346186A - Status: Granted - Kind: A - Application number: 08/072,611 - Filed: 1993-06-07 - Granted: 1994-09-13 - Earliest claimed: 1993-06-07 - Assignees: Protective Technologies, Inc. - Inventors: William F. Given - Web page: https://patentgrep.com/patent/US5346186A ## CPC - C21B 7/12: Opening or sealing the tap holes - C21B: MANUFACTURE OF IRON OR STEEL (preliminary treatment of ferrous ores or scrap C22B1/00) ## Abstract A nozzle guard device (50, 50') has a generally C-shaped half-shell configuration for shielding a lower and otherwise exposed portion of a blast furnace mudgun nozzle (22) from damaging contact with molten metal and slag during taphole closure operations. Mounting elements (86, 86') are provided for extension into an opening (26) of the nozzle (22) for embedding a refractory clay material contained within the opening (26) for securing the nozzle guard device (50, 50') in position on the nozzle (22). ## Claims ### Claim 1 A protective nozzle guard device (50, 50') for attachment to a nozzle (22) of a blast furnace clay gun (16) used for selectively closing a taphole (12) of a blast furnace (10) to stop outflow of molten metal and slag therethrough by inserting a nose (32) of the nozzle (22) into the taphole (12) and injecting clay material (C) into the taphole (12) through a nozzle opening (26) in an endface (24) of the nozzle (22), said nozzle guard device (50, 50') comprising: a face guard member (52) having a back surface (56) an opposite front surface (58) and an outer peripheral surface (60); and mounting means (84, 84') projecting beyond said back surface (56) and spaced inwardly from said outer peripheral surface (60) of said face guard member (52) so as to be insertable into the nozzle opening (26) for engaging the clay material contained within the nozzle opening (26) in response to inserting said mounting means (84, 84') into said nozzle opening (26) to thereby mount and retain said face guard member (54) in overlying shielding relation with the end face (24) of the nozzle (22). ### Claim 2 (depends on 1) The nozzle guard device of claim 1 wherein said mounting means (84, 94') comprises at least one mounting spike (86, 86') secured to said face guard member (52) and projecting rearwardly beyond said back surface (56) of said face guard member (52). ### Claim 3 (depends on 2) The nozzle guard device of claim 2 wherein said face guard member (52) has an inner peripheral surface (60) spaced radially inwardly from said outer peripheral surface. ### Claim 4 (depends on 2) The nozzle guard device of claim 2 wherein said nozzle guard device (50, 50') further includes a nose guard skirt (54) secured to and extending along said outer peripheral surface (62) and extending rearwardly beyond said back surface (56) for shielding the nose (42) of the nozzle (22) from exposure to the molten metal and slag during taphole closing operations. ### Claim 5 (depends on 4) The nozzle guard device of claim 4 wherein said face guard member (52) and said noise guard skirt (52) are fabricated of combustible materials. ### Claim 6 (depends on 5) The nozzle guard device of claim 5 wherein said face guard member (52) and said nose guard skirt (52) have a protective outer coating (82) of refractory material. ### Claim 7 (depends on 1) The nozzle guard device of claim 1 wherein said face guard member (52) extends accurately between opposite spaced ends (72, 74) in a generally C-shaped configuration. ### Claim 8 A protective nozzle guard device (50, 50') for attachment to a nozzle (22) of a blast furnace clay gun (16) used for selectively closing a taphole (12) of a blast furnace (10) to stop outflow of molten metal and slag therethrough by inserting a nose (42) of the nozzle (22) into the taphole (12) and injecting clay material (C) into the taphole (12) through an opening (26) in an endface of the nozzle, said nozzle guard device (50, 50') comprising: a face guard member (52) extending arcuately between opposite spaced ends (72, 74) in a generally C-shaped configuration; and including mounting means (84, 84') for self-mounting and retaining said face guard member (52) on a bottom portion of the nozzle (22) with said ends projecting upwardly in response to moving said face guard member (52) toward engagement with the nozzle endface (24) to shield a lower and otherwise exposed portion of the nozzle endface (24) from contact with the molten metal and slag during taphole closing operations. ### Claim 9 (depends on 8) The nozzle guard device of claim 8 wherein said mounting means (50, 50') comprises at least one mounting spike (86, 86') projecting rearwardly beyond a back surface (56) of said face guard member (52) to a distal end (88) for insertion into the nozzle opening (26) of the nozzle (22) and embedding in clay material (C) within the nozzle opening (26) to thereby secure said face guard member (52) to the nozzle (22). ### Claim 10 (depends on 9) The nozzle guard device of claim 9 wherein said face guard member (52) has an outer perimeter surface (62), said mounting spike (86) being disposed radially inwardly of said outer perimeter surface (62). ### Claim 11 (depends on 10) The nozzle guard device of claim 10 further including a nose guard skirt (54) secured to said face guard member (52) and extending between said ends (72, 74) and rearwardly beyond said back surface (56) of said face guard member (52) for shielding an underside and otherwise exposed portion of the nose (42) from exposure to the molten metal and slag during the taphole closing operations. ### Claim 12 (depends on 11) The nozzle guard device of claim 11 wherein said mounting means (84) comprises a plurality of said mounting spikes (86). ### Claim 13 (depends on 12) The nozzle guard device of claim 12 wherein at least some of said mounting spikes (86) are inclined in relation to said back surface (56) of said face guard member (52). ### Claim 14 (depends on 11) The nozzle guard device of claim 11 wherein said mounting spike is spaced radially inward of said nose guard skirt (52). ### Claim 15 (depends on 14) The nozzle guard device of claim 14 wherein said face guard member (52) has an inner perimeter surface (64) and at least one anchor projection (90) extending radially inward beyond said inner peripheral surface (60) anchoring said mounting spike (86) to said face guard member (52). ### Claim 16 (depends on 11) The nozzle guard device of claim 11 wherein said mounting spike (86, 86') includes at least one radial projection (87) adjacent said distal end (88, 88'). ### Claim 17 (depends on 11) The nozzle guard device of claim 11 wherein said mounting spike (86) comprises a sheet metal blade. ### Claim 18 (depends on 11) The nozzle guard device of claim 11 wherein said face guard member (52) is fabricated of a sacrificial combustible material. ### Claim 19 (depends on 18) The nozzle guard device of claim 18 wherein said face guard member (52) is fabricated of wood. ### Claim 20 (depends on 18) The nozzle guard device of claim 18 wherein said nose guard skirt (54) is fabricated of a sacrificial combustible material. ### Claim 21 (depends on 20) The nozzle guard device of claim 20 wherein said nose guard skirt (54) is fabricated of fiberboard. ### Claim 22 (depends on 20) The nozzle guard device of claim 20 wherein said face guard member (52) and said nose guard skirt (52) have a protective outer coating (92) of refractory material. ### Claim 23 (depends on 22) The nozzle guard device of claim 22 wherein said refractory coating material is frangible. ### Claim 24 A protective nozzle guard device (50, 50') for attachment to a nozzle (22) of a blast furnace clay gun (16) having an endface (24) and a nozzle opening (26), said nozzle guard device comprising: a face guard member (52) fabricated of combustible material, said face guard member (52) having a front surface (58), an opposite back surface (56), and an outer peripheral surface (62); and at least one self-attaching mounting member (84, 84') projecting from said back surface (56) and spaced inwardly from said outer peripheral surface (62) so as to enable said mounting member (84, 84') to be inserted into the nozzle opening (26) to thereby position and retain said face guard member (52) in overlying shielding relation with the nozzle endface (24).