US3063409A - Apparatus for continuous coating of elongated articles - Google Patents

Apparatus for continuous coating of elongated articles Download PDF

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Publication number
US3063409A
US3063409A US791612A US79161259A US3063409A US 3063409 A US3063409 A US 3063409A US 791612 A US791612 A US 791612A US 79161259 A US79161259 A US 79161259A US 3063409 A US3063409 A US 3063409A
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United States
Prior art keywords
pipe
screws
tank
pipes
coating
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Expired - Lifetime
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US791612A
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English (en)
Inventor
Frank E Turner
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Blaw Knox Co
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Blaw Knox Co
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Publication date
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Priority to US791612A priority Critical patent/US3063409A/en
Priority to FR796786A priority patent/FR1246214A/fr
Priority to GB43312/59A priority patent/GB891633A/en
Priority to DE19601506846 priority patent/DE1506846A1/de
Priority to DE19601251222 priority patent/DE1251222B/de
Priority to BE587345A priority patent/BE587345A/fr
Application granted granted Critical
Publication of US3063409A publication Critical patent/US3063409A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G49/00—Conveying systems characterised by their application for specified purposes not otherwise provided for
    • B65G49/02—Conveying systems characterised by their application for specified purposes not otherwise provided for for conveying workpieces through baths of liquid
    • B65G49/04—Conveying systems characterised by their application for specified purposes not otherwise provided for for conveying workpieces through baths of liquid the workpieces being immersed and withdrawn by movement in a vertical direction
    • B65G49/0409—Conveying systems characterised by their application for specified purposes not otherwise provided for for conveying workpieces through baths of liquid the workpieces being immersed and withdrawn by movement in a vertical direction specially adapted for workpieces of definite length
    • B65G49/0413—Conveying systems characterised by their application for specified purposes not otherwise provided for for conveying workpieces through baths of liquid the workpieces being immersed and withdrawn by movement in a vertical direction specially adapted for workpieces of definite length arrangements for conveyance through the bath
    • B65G49/0418—Conveying systems characterised by their application for specified purposes not otherwise provided for for conveying workpieces through baths of liquid the workpieces being immersed and withdrawn by movement in a vertical direction specially adapted for workpieces of definite length arrangements for conveyance through the bath chain or belt conveyors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G47/00—Article or material-handling devices associated with conveyors; Methods employing such devices
    • B65G47/74—Feeding, transfer, or discharging devices of particular kinds or types
    • B65G47/84—Star-shaped wheels or devices having endless travelling belts or chains, the wheels or devices being equipped with article-engaging elements
    • B65G47/846—Star-shaped wheels or wheels equipped with article-engaging elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G49/00—Conveying systems characterised by their application for specified purposes not otherwise provided for
    • B65G49/02—Conveying systems characterised by their application for specified purposes not otherwise provided for for conveying workpieces through baths of liquid
    • B65G49/04—Conveying systems characterised by their application for specified purposes not otherwise provided for for conveying workpieces through baths of liquid the workpieces being immersed and withdrawn by movement in a vertical direction
    • B65G49/0404—Conveying systems characterised by their application for specified purposes not otherwise provided for for conveying workpieces through baths of liquid the workpieces being immersed and withdrawn by movement in a vertical direction specially adapted for very long workpieces, e.g. chains, cables or belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G49/00—Conveying systems characterised by their application for specified purposes not otherwise provided for
    • B65G49/02—Conveying systems characterised by their application for specified purposes not otherwise provided for for conveying workpieces through baths of liquid
    • B65G49/04—Conveying systems characterised by their application for specified purposes not otherwise provided for for conveying workpieces through baths of liquid the workpieces being immersed and withdrawn by movement in a vertical direction
    • B65G49/0409—Conveying systems characterised by their application for specified purposes not otherwise provided for for conveying workpieces through baths of liquid the workpieces being immersed and withdrawn by movement in a vertical direction specially adapted for workpieces of definite length
    • B65G49/0413—Conveying systems characterised by their application for specified purposes not otherwise provided for for conveying workpieces through baths of liquid the workpieces being immersed and withdrawn by movement in a vertical direction specially adapted for workpieces of definite length arrangements for conveyance through the bath
    • B65G49/0422—Conveying systems characterised by their application for specified purposes not otherwise provided for for conveying workpieces through baths of liquid the workpieces being immersed and withdrawn by movement in a vertical direction specially adapted for workpieces of definite length arrangements for conveyance through the bath screws
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/38—Wires; Tubes
    • C23C2/385—Tubes of specific length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
    • B65G2201/02—Articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
    • B65G2201/02—Articles
    • B65G2201/0214—Articles of special size, shape or weigh
    • B65G2201/0217—Elongated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G33/00—Screw or rotary spiral conveyors
    • B65G33/02—Screw or rotary spiral conveyors for articles
    • B65G33/04—Screw or rotary spiral conveyors for articles conveyed between a single screw and guiding means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S118/00—Coating apparatus
    • Y10S118/10—Pipe and tube inside

Definitions

  • I2 (Tiaims. (iCl. 118-426) This invention relates to the treatment of elongated articles with liquid material and more particularly to an improved method of and apparatus for the continuous hot galvanizing of metal products such as pipe, bars, shapes, etc.
  • Another object of my invention is to provide means for automatically submerging hollow elongated articles in a coating bath whereby one end of each article is caused to enter the bath initially at a lower level than the other end and, during travel of the pipe through the bath, the longitudinal axis of the pipe is tilted so that the coating bath will flow freely through the inside of the article without entrapment of air, and whereby, after complete immersion, the pipe will be withdrawn from the bath with the aXis tilted in the opposite direction from its position on entry.
  • a further object of my invention is the provision of a means for continuously pickling and cleaning a series of pipes or the like and causing same to be submerged in and withdrawn from a galvanizing tank in sequential order. My invention also contemplates improved means for withdrawing the pipe from the coating tank and removing excess zinc or other coating material therefrom in a continuous and automatic manner.
  • FIGURE 1 is a plan view, partly in horizontal cross section, illustrating my invention as incorporated in pipe galvanizing apparatus;
  • FIGURE 2 is an enlarged vertical cross-sectional view taken substantially on line 22 of FIGURE 1;
  • FIGURE 3 is a vertical cross-sectional View taken substantially on line 3-3 of FIGURE 2, the pipe conveying and sinking screws, however, being illustrated in the positions they assume as a pipe is being moved endwise out of the galvanizing bath;
  • FIGURE 4 is an end elevational view taken substantially on line 4-4 of FIGURE 1 and illustrating the internal and external coating control stations and the magnetic roll conveyor means for removing coated pipe from the galvanizing tank;
  • FIGURE 5 is a vertical cross-sectional view taken substantially on line 55 of FIGURE 1 and illustrating the indexing transfer means for moving pipe from the magnetic roll conveyor to the internal coating control station, the water bosh, the spray coating unit, etc.;
  • FIGURE 6 is an enlarged view, generally similar to FIGURE 3 but also illustrating in phantom lines the sev eral positions of the longitudinal axes of the pipes as they move into and through the galvanizing kettle;
  • FIGURE 7 is an enlarged vertical cross-sectional view through the galvanizing kettle and illustrating the front conveying screw
  • FIGURE 8 is a vertical cross-sectional view taken substantially on line 38 of FIGURE 7 and illustrating the discharge end of the front conveying screw;
  • FIGURE 9 is a view generally similar to FIGURE 7 but illustrating the rear conveying screw
  • FIGURE 10 is a fragmentary cross-sectional view taken substantially on line Iii1t) of FIGURE 9 and illustrating the form of the discharge end portion of the rear conveying screw;
  • FIGURE 11 is a fragmentary view of a modified form of the galvanizing section of my apparatus in which a flux tank is provided immediately ahead of the galvanizing kettle;
  • FIGURE 12 is a View generally similar to FIGURE 7 but illustrating a modified form of a conveying screw having a double thread and particularly adapted to handle pipes of relatively small diameter in pairs.
  • the automatic continuous pipe galvanizing line illustrated includes a loading rack comprising a plurality of inclined skid members 1 adapted to receive bundles of pipe from storage or previous processing operations.
  • the pipes P are arranged in a single layer and rolled downwardly by gravity.
  • an automatic selector unit comprising a plurality of rotating conveying screws 2 which are simultaneously driven by suitable gearing and shafting such that their rotation is in a direction to advance the pipes one at a time in a direction perpendicular to their length.
  • the pitch of the screws 2 and the shape of the entering ends of the threads thereon is such that one individual length of pipe will be removed from the loading skids I at every 360 of rotation of the screws.
  • the pipes P are removed one at a time from the skids I and are individually advanced in spaced apart relation in a direction normal to their longitudinal axes.
  • the pipes are delivered to a rotating purge chamber 3 in which a vaned rotary gas seal and transfer wheel 4 is mounted.
  • the wheel 4 has a plurality of vanes (six as illustrated) separating the unit into a plurality of compartments.
  • the shaft 5 on which the transfer wheel 4 is supported is connected by a chain 6 to the drive shaft 2 for the rotating screws 2, and thus the rotation of the screws 2 is synchronized and interlocked with the transfer wheel 4 so that the screws 2 will successively discharge pipes, one into each of the compartments formed by the vanes of the transfer wheel.
  • the wheel 4 rotates in clockwise direction and has a fairly close fit with the walls of the chamber 3 so that a seal is provided for preventing undesired entry or escape of atmosphere to or from the furnace F.
  • a controlled atmosphere of suitable type is caused to enter the compartments formed by the rotating wheel 4 in the purge chamber 3 to purge the air from the compartments and pipes contained therein before they enter the furnace.
  • a chain transfer or conveyor comprising a plurality of conveyor chains 7 which extend through the furnace F and carry the lengths of pipe P therethrough. Screw conveyors may be employed in place of chains 7 if desired.
  • Each of the chains 7 is supported on end sprockets 8 and 9 mounted respectively on shafts 10 and 11 and is guided by suitable idler sprockets as seen as 12, 13 and 14 in FIGURE 2.
  • Floating counterweights 15 maintain the desired tension on the chains 7 which are provided with spaced upstanding lugs '7 which engage the pipes P and move them on suitable rails or skids 7 through the furnace F.
  • the shaft 10 which supports the sprockets 8 is connected to the shaft 5 of the rotary transfer Wheel 4 by chain 15 so that there is positive synchronization of the automatic selector screws 2, the vaned transfer wheel 14, and the chains 7 or conveyor screws.
  • the furnace F as best seen in FIGURE 2, consists of an entry chamber 16, a heating chamber 17, and an exit end and galvanizing machine housing section 18.
  • a controlled atmosphere is maintained within the furnace F suitable to effect gas pickling of the pipe prior to galvanizing.
  • the length of the heating chamber 17 of the furnace F is such that, as the pipes travel therethrough, they will be heated to a temperature proper for hot galvanizing. Heat may be supplied to the furnace by any suitable means (not shown) such as electrical resistance heating elements, fluid fuel fired radiant heating tubes, gas burners, etc., and sliding gates 17 may be provided for closing off the furnace chamber if desired.
  • a galvanizing machine unit Disposed within the galvanizing chamber section 18 of the furnace F is a galvanizing machine unit which includes a galvanizing kettle 19, adapted to contain a bath of molten zinc, the level of which is indicated at Z in FIGURES 6, 7 and 9, and a pair of spaced pipe conveying and sinking screws generally indicated at S and S. These screws are mounted respectively on shafts 20 and 21 which extend across the top of the galvanizing kettle 19 and through the end wall 22 of the furnace F.
  • a suitable frame structure 23 Within the exit end portion 18 of furnace F, is provided for supporting shafts 20 and 21, and the feed screws S and S are so disposed that their entering or pick-up ends 29 and 30 (lefthand as seen in FIGURE 2) are positioned to take the pipes P one at a time as they leave skids 7 at the exit end of the conveyor chains 7 and move them in an advancing series on spaced guides or skids G (see FIG- URE 3) toward the galvanizing kettle 19.
  • the shaft 11 which carries the sprockets 9 for the conveyor chain 7 is connected through gear box 24 and shaft 25 to gear box 26 which is driven by the motor 27.
  • Shaft 28 extends from gear box 26 and has geared connection to shafts 20 and 21 which support the conveying screws S and S.
  • This interconnection of the conveyor screw drive and the chain drive provides positive synchronization of the chains 7 and the screws S and S so that each complete rotation of the screws a length of pipe P will be picked up from the conveyors 7 and moved along the guides or skids G by the entering or pick-up portions 29 and 30 respectively of screws S and S (see FIGURES 7 and 9).
  • the pipe guides or skids G are spaced longitudinally of the galvanizing kettle 19 and are offset from the front and rear conveying screws S and S.
  • the size and contour of the several guides G vary for reasons which will be later referred to, they each have a horizontal entering portion 31, the top edge of which is disposed approximately at the level of the outside of the threads 32 and 33 on the pick-up portions 29 and 30 of screws S and S.
  • the entering portions 31 of guides G are downwardly inclined portions 34- which extend into the galvanizing kettle 19 and have their upper edges sloped to impart the desired travel of the pipes P into the coating bath in kettle 19.
  • each has flaring or enlarging portions 35 and 36 respectively.
  • the pick-up thread portions 32 and 33 of screws S and S continue on the flaring portions 35 and 36 thereof and are indicated at 35 and 36.
  • the guides G and the enlarging threaded portions 35 and 36' of screws S and S are so correlated that the pipes P will be supported on the inclined portions 34 of the guides G and advanced downwardly into the coating bath in the kettle 19 by the action of the threads 35 and 36.
  • the guides G each have bottom portions 37 over which the pipes P are traversed by the threads of the front and rear conveying screws S and S.
  • each of the guides G has a support portion 38, the upper part of which is adapted to rest on the top of the galvanizing kettle 19 and thus hold the guide in proper position therein while permitting it to be removed when it is desired to clean out the kettle or for any other reason.
  • the guides G are preferably arranged in pairs that are joined together by connecting bars 39. This assists in properly locating and maintaining the guides G in position in the galvanizing kettle 19.
  • the location of the angle of slope of the portions 34'01 the several guides G varies.
  • the guide G that is immediately adjacent the front conveying and sinking screw S has a portion 34 which is inclined at a lesser angle than the corresponding portion 34 of the guide G adjacent rear conveying crew S and seen in FIGURE 9.
  • the pipes illustrated are given the same reference characters.
  • FIGURE 6 The several positions of the pipes being submerged in the coating bath that are shown in FIGURES 7 and 9 are also indicated by phantom center lines in FIGURE 6.
  • the center line of pipe L of FIG- URES 7 and 9 is seen at L, and it will be observed that at this point the pipe is horizontal and Well above the zinc level Z.
  • the pipe M of FIGURES 7 and 9, as seen by its center line M in FIGURE 6, has had its front end tilted downwardly, and pipe N of FIGURES 7 and 9, while its axis is maintained substantially parallel to the position of the axis of pipe M, has been moved bodily downwardly until its forward end has entered the zinc bath.
  • Pipe Q of FIGURES 7 and 9 has reached the bottom of the inclined portions of guides G and, as seen in FIGURE 6, is now disposed with its axis horizontal and is completely submerged below the level of the zinc in the kettle 19.
  • the pipe P that is seen in full view in FIGURE 6 has, as will be more fully described later, reached the exit grooves and the conveying screws S and S and is steeply inclined for angular removal from the kettle 19.
  • This groove Ali is circular, as seen in FIGURE 8, and has a permanent magnet portion 41 which extends around a portion only of the base of the groove.
  • a permanent magnet 44 is mounted in the cam portion 43 and is effective over the portion of the bottom of the groove 42 that is most remote from the shaft 21 (see FIGURE 3).
  • elongated slots 45 are provided in the guides G that are supported adjacent the rear conveying screw S. These slots permit the cam portion 43 of screws S to rotate therethrough and also permit the pipes that are conveyed into the grooves 42 by the threads 36 to be lowered as the enlarged part of the cam portion approaches its lowest position.
  • the pipes P are picked up from the ends of the conveyor chains 7 and are traversed by conveying screws S and S successively over the horizontal portions 31 of the guides G and down into the galvanizing bath in the kettle 19, the axis of each pipe being tilted during movement into the galvanizing bath so that the front end enters first and then the rear end being moved down so that the pipe is horizontal when fully submerged in the bath.
  • the pipes are traversed through the bath in a direction perpendicular to their length and ultimately move into the grooves 40 and 42 on screws S and S respectively.
  • the permanent magnet portions 41 and 4-4 thereof will hold the pipe firmly against the base of the grooves 40 and 42 and cause the pipe to be fed longitudinally in the direction of its length.
  • two permanent magnet rolls 50 and 51 having V-grooves on their outer surface to assist in gripping and guiding the pipes, are mounted just beyond conveying screw S in the direction of pipe travel.
  • the axis of roll 51 is vertically offset from the axis of roll 50 so that, as a pipe P is moved into its upwardly inclined position by the action of the cam portion 43 of rear conveying screw S and is moved longitudinally by magnets 41 and 44 on screws S and S, the forward end of the pipe will engage magnetic rolls 50 and 51.
  • the advancing ends of the pipes P, as they are moved out of the galvanizing kettle 19, are moved into engagement with the lower rolls of a magnetic roll conveyor unit that is best seen in FIGURE 4.
  • This unit includes at its lowermost end a pair of driven permanent magnet rolls 52 and 53 which are aligned with the path of travel of the pipes as they exit fromthe galvanizing tank. These rolls 52 and 53 engage and pick up the pipes as they come along.
  • Supported on an inclined frame 54 are a series of driven electromagnetic rolls 55, 56, 57 and 58 which are adapted to be energized and d e-energized by suitable electrical connections and controls (not shown) in a well-known manner.
  • the pipe P has been moved in the direction of its length by the permanent magnet rolls 52 and 53 and has engaged the electromagnet rolls 55, 56, 5'7 and 5%, which are energized at all time except when the limit switch 59 is actuated.
  • the depending contractor 59 of limit switch 59 extends into the path of the end of the pipe P.
  • the pipe P has left the permanent magnet rolls 52 and 53 and is supported by the energized electromagnet rolls.
  • a plurality (three as illustrated) of the indexing transfer units T are spaced along and below the pipes that are conveyed by the electromagnet rolls SS, 56, 57 and 53.
  • the units T are supported on an inclined frame structure 61.
  • Each unit T includes a movable rack 6t? pivotally supported on a pair of parallel arms 62 which are in turn mounted on driven shafts for rotation in the direction of the arrow in FIGURE 5.
  • a second movable rack 63 is similarly supported on arms 64 which are also arranged in parallel relation and on the opposite side of the main frame 65 of unit T from the arms 62.
  • the arms 62 and '64 are supported on driven shafts which are interconnected, as by suitable gearing or the like, so that the shafts will rotate in the same direction and carry therewith the movable racks 60 and 63 While the upper faces thereof will be maintained in a horizontal plane at all times.
  • the arms 64 are disposed 90 in advance of the arms 62 and, because of the interconnection of the drive shafts of the arms 62 and 64, this angular spacing remains constant.
  • a stationary transfer rack 66 is mounted on the main frame 65 of the units T. The arms 62 and 64 are disposed on opposite sides of frame 65 and thus the stationary rack 66 is disposed between the paths of the movable racks 60 and 63.
  • the movable racks 60 and 63 are in their normal or at-rest positions.
  • Suitable single revolution control means (not shown) are provided for the drive means which operates the shafts on which arms 62 and 64- are mounted.
  • the operation of this single revolution control means is such that when a pipe P engages the limit switch 59 and de-energizes the magnet rolls 5558 and a pipe P is dropped from these rolls onto the movable rack 60, the rotary movement of the racks is started and continues through 360 whereupon the racks stop in their at-rest positions and remain their until another single revolution cycle is started by engagement of the limit switch 59 by the next pipe.
  • the indexing transfer units T provide means for timed transfer of pipes from the conveying rolls 5558 to the internal coating control station and further transfer from this coating control station to the movable chain type cooling bed B.
  • the bed B includes a pair of chain conveyors 67 and a plurality of spaced supporting rails 67 (see FIGURE 1).
  • the discharge ends of these rails 67 are all disposed in the same level above the top of the water bosh or tank 68.
  • the discharge end of the rails 67' are curved downwardly as seen at 67" to faciliate the desired free fall of the lengths of pipe into the water in the bosh or tank 68.
  • Chain conveyors '70 pick up the pipes as they are dropped into the bosh 68 and remove them therefrom. These conveyors pass over a pan. or trough 70 which is adapted to collect surplus coating liquid which may be sprayed onto the pipes, as they move over the pan 70, by suitable spray heads or the like (not shown). This spray is preferably of a solution which inhibits the formation of so-called white rust or bloom on the surface of the galvanized pipes. After leaving the conveyors 70, the pipes reach the inspection table 71 from which they may be removed for further processing, storage or shipment.
  • the pipes P When the pipes P are withdrawn from the bath of molten zinc in the galvanizing kettle 19, they pass through an exterior coating control station which is located between the permanent magnet rolls 52 and 53 and consists of an annular pipe 78 connected to a suitable source of steam or air under pressure and having a plurality of small holes or jets adapted to direct streams or steam or air over the entire outer surface of the pipes P as they pass lengthwise through the opening in the annular pipe 78.
  • the effect of the impinging jets of air or steam on the molten zinc on the outside of the pipes P is to remove excessive amounts and equalize the coating so the desired uniform thickness is obtained.
  • the internal coating control station In order to control the thickness of the coating on the interior of the pipes P, the internal coating control station generally indicated at C in FIGURE 4 is provided. Before describing unit C, however, it is pointed out that the movable rack 63 on the indexing transfer unit T that is disposed under the electromagnet roll 58 (FIGURE 4) has a permanent magnet associated therewith and efiective on the pipes supported thereby so that the pipe P is held on this rack 63 against backward lengthwise movement during operation of the internal coating control apparatus thereon.
  • the unit C includes a horizontally adjustable supporting frame 72, a slide or guide member '73, and a cross head 74- slidable in said guide 73 and connected to a connecting rod 75 which in turn is operated by crank unit 76 mounted on a suitable shaft and driven by suitable means.
  • a bell mouth pipe end engaging member 77 is carried by the cross head 74 and is provided with air or steam pressure connections adapted, when the bell mouth is in engagement with the forward end of a pipe P, as seen in FIGURE 4, to discharge air or steam under pressure to the interior of the pipe while sealing the end thereof. This air or steam, or other fluid under pressure, blows out the excess coating material from the interior of the pipe.
  • the bell 77 may be withdrawn from its operating position to permit the pipes P to be moved into and out of internal coating control position.
  • the crank '76 is operated to move the bell 77 into tight engagement with the end of the pipe.
  • the air or stream under pressure is then discharged through the pipe by suitable automatic control valve means, and the internal coating control operation is carried out.
  • the bell 77 is retracted by further rotation of the crank 76 upon completion of the coating control operation and before the next single rotation cycle of the support members 63 of indexing transfer units T.
  • the furnace 17 is used only for bringing the pipes up to proper galvanizing temperature in a reducing atmosphere, and a flux tank 80 may be provided ahead of the galvanizing tank 81 as seen in FIGURE 11.
  • the conveying end sinking screw S" is provided with an entering portion 82 which takes the pipes from the furnace, a double inclined fluxing portion 83 which moves the pipes down into the flux bath in tank 89 and then lifts them out again, a horizontal transfer portion 84 which carries the pipes after they are withdrawn from the fluxing bath to the galvanizing tank 81, and a galvanizing portion 35 generally similar to the corresponding portion of screw S of FIGURE 2.
  • the screw S is the front conveyor screw, but it will be understood that the rear conveyor screw for an installation including a fluxing bath would be generally similar to the rear conveyor screw of the apparatus of FIGURES 2 and 3 except for the addition of the forward part of the screw which moves the pipes into and out of the flux tank.
  • the screw 8" is a front conveying screw and difiers from screw S of FIG URE 2 largely in that it is provided with a double thread.
  • one thread of screw 8 is indicated at 86 while the next or second thread is indicated at 87.
  • the pitch or lead of these threads at the entering (left) end of screw 5'' is increased in order to facilitate removal of the pipes from the conveyor 88, but in the main body of the screw the pitch of the threads 36 and 87 is substantially the same as that of the thread 32 of screw S.
  • the double thread screw 3'' can handle two pipes of about two inch diameter in the same lineal space.
  • the output of the machine when operating on small sizes of pipe, may be about doubled over that which could be obtained if the single thread screw S were used at all times.
  • the portions of the furnace housing above these elements are removable.
  • the magnetic rolls 5%, 51, etc. are illustrated as having two pipe receiving grooves therein. These double grooves are provided so that when the double thread screw 8 is used and the pipes are moved through the galvanizing kettle in pairs, they are handled in pairs as they are moved longitudinally out of the galvanizing kettle.
  • the supporting edges of the racks 63', 63 and 66' of the indexing transfer units T are illustrated as having two pipe receiving notches. This also is to permit them to be used with double thread conveying and sinking screws as shown in FIGURE 12.
  • my improved appartus provides a fully automatic coating line for elongated articles, particularly suited for the galvanizing of steel pipe or the like.
  • each article is positively maintained in the same relation to the other articles throughout the coating procedure.
  • each article is given exactly the same treatment, resulting in uniformly coated 1G product.
  • Extremely hazardous and awkward manual handling of product in conventional galvanizing lines is presently common practice.
  • my apparatus may be operated with a minimum of manpower and at a high rate of production.
  • a tank for holding a bath of coating material in liquid form a plurality of conveying screws having spaced apart axes, said conveying screws having pick-up ends disposed to engage an elongated object at spaced points along its length and having threads thereon portions of which progressively increase in diameter in the direction of feed of said object and extend into said bath, and a plurality of object supporting skids adjacent said conveying screws and extending into said tank in spaced apart relation along the length of said objects being coated.
  • a tank for holding a bath of coating material in liquid form a plurality of conveying screws having spaced apart axes, said conveying screws having pick-up ends disposed to engage an elongated object at spaced points along its length and feed same into said tank in a direction transversely of the length of said object, said conveying screws having threads thereon portions of the diameters of which increase in the direction of feed of said object and extend into said bath, and a plurality of object supporting skids adjacent said conveying screws and extending into said tank in spaced apart relation along the length of said objects being coated, said skids having object engaging edges contoured to correspond to said diameters of said conveying screws and spaced below said screws whereby said object is held in feeding engagement with the threads of said screws.
  • a tank for holding a bath of coating material in liquid form
  • conveyor means for continuously moving a series of elongated objects in a direction transversely of their length up to said tank above the surface of said coating material therein, a plurality of conveying screws having their axes spaced apart lengthwise of the objects being coated and extending in the direction of movement of said objects on said conveyor means and disposed above the coating material level in said tank, said screws having threads thereon portions of which increase in diameter in the direction of advance of the threads and extend into said bath, a plurality of object supporting skids extending into said tank adjacent said screws and spaced apart along the length of said objects being coated, the diameters of said portions of said threads on said conveying screws increasing differently relative to each other along the screw axes whereby elongated objects leaving said conveyor means, will be moved in succession transversely of their length into said bath of coating liquid and one end of each of said objects will be moved through a different vertical travel than the other end, and means for maintaining
  • a tank for holding a bath of coating material in liquid form
  • conveyor means for continuously moving a series of elongated objects in a direction transversely of their length up to said tank above the surface of said coating material therein
  • a plurality of conveying screws having their axes spaced apart lengthwise of the objects being coated and extending in the direction of movement of said objects on said conveyor means and disposed above the coating material level in said tank, said screws having threads thereon portions of which increase in diameter in the direction of advance of said threads, and a plurality of object supporting skids extending into said tank below said screws and spaced apart along the length of said objects being coated, the diameters of said portions of said threads on said conveying screws increasing differently relative to each other along the screw axes whereby elongated objects leaving said conveyor will be moved in succession transversely of their length into said bath of coating liquid and one end of each of said objects will be moved through a different vertical travel than the other end, said conveying screws having non-advancing grooves
  • a tank for holding a bath of coating material in liquid form means for continuously moving a series of elongated objects in a direction transversely of their length up to said tank above the surface of said coating material therein, a plurality of conveying screws having their axes spaced apart lengthwise of the objects being coated and extending in the direction of movement of said objects on said article moving means and disposed above the coating material level in said tank, said screws including portions having threads thereon that increase in diameter in the direction of advance of said threads, a plurality of object supporting skids extending into said tank below said screws and spaced apart along the length of said objects being coated, the diameters of said portions of said screws increasing differently in different screws whereby elongated objects leaving said article moving means will be moved in succession transversely of their length into said bath of coating liquid and one end of each of said objects will be moved through a different vertical travel than the other end.
  • a tank for holding a bath of coating material in liquid form means for continuously moving a series of elongated objects in a direction transversely of their length up to said tank above the surface of said coating material therein, a plurality of conveying screws having their axes spaced apart lengthwise of the objects being coated and extending in the direction of movement of said objects on said article moving means and disposed above said coating material level in said tank, said screws including portions having threads thereon that increase in diameter in the direction of advance of said threads, a plurality of object supporting skids extending into said tank below said screws and spaced apart along the length of said objects being coated, the diameters of said portions of said screws increasing differently in different screws whereby elongated objects leaving said conveyor means will be moved in succession transversely of their length into said bath of coating liquid and one end of each of said objects will be moved through a different vertical travel than the other end, magnet means on one of said conveying screws effective over a portion only of the periphery at the
  • Apparatus for continuously coating elongated articles including, conveyor means for moving a series of said articles in parallel relation in a direction transversely of their length, a housing for said conveyor means adapted to maintain a gaseous atmosphere therein, means for heating said articles as they are moved through said housing by said conveyor means, a coating tank within said housing at the discharge end of said conveyor means, a plurality of rotatable conveying and sinking screws disposed in said housing and having their axes extending across said coating tank in a direction transversely of the length of said articles, said screws having article pickup thread portions at the discharge end of said conveyor means adapted to pick up articles in spaced series relation from said conveyor means, said screws having progressively enlarging thread portions of increasing diameter merging with said pick-up thread portions and extending into said coating tank, means in said tank for supporting and guiding articles moved by said screws whereby said articles are held in engagement with said enlarging thread sections and moved into said tank in a direction transversely of their length, magnetic means on said screws for moving
  • Apparatus for continuously coating elongated articles including conveyor means for moving a series of said articles in parallel relation in a direction transversely of their length, a housing for said conveyor means adapted to maintain a gaseous atmosphere therein, means for heating said articles as they are moved through said housing by said conveyor means, a coating tank within said housing at the discharge end of said conveyor means, a plurality of rotatable conveying and sinking screws disposed in said housing and having their axes extending across said coating tank in a direction transversely of the length of said articles, said screws having article pickup thread portions at the discharge end of said conveyor means adapted to pick up articles in spaced series relation from said conveyor means, said screws having enlarging thread portions of increasing root diameter merging with said pick-up thread portions and extending into said coating tank, spaced apart skid means in said tank for supporting and guiding articles moved by said screws whereby said articles are held in engagement with said enlarging thread sections and moved into said tank in a direction transversely of their length, magnetic means on said
  • pipe galvanizing apparatus having a galvanizing tank adapted to hold a bath of molten zinc, a conveying and sinking screw having a pick-up end and a discharge end and rotatably supported above said bath with its axis extending thereover, said screw having a continuous thread extending from one end to the other, said thread at said pick-up end being of constant diameter and progressively increasing in diameter above said bath whereby said thread enters said bath and is adapted to sink a pipe being conveyed by said screw into said bath, and a discharge groove at the discharge end of said thread to which said thread connect and into which pipes are delivered by said thread, and means carried by said screw and effective on a pipe when in said discharge groove to move said pipe longitudinally in a direction normal to the direction of movement imparted to said pipe by said thread.
  • a tank adapted to hold a bath of coating liquid
  • a conveying and sinking screw having a pick-up end and a discharge end, said screw having a double thread extending from one end to the other, said thread including a portion of progressively increasing diameter disposed above said tank whereby said thread enters said bath and is adapted to convey a pipe to said bath and sink the pipe therein, and means for rotatably supporting said screw above said bath with its axis extending thereover.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
US791612A 1959-02-06 1959-02-06 Apparatus for continuous coating of elongated articles Expired - Lifetime US3063409A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US791612A US3063409A (en) 1959-02-06 1959-02-06 Apparatus for continuous coating of elongated articles
FR796786A FR1246214A (fr) 1959-02-06 1959-06-06 Procédé et dispositif de revêtement en continu d'articles de forme allongée
GB43312/59A GB891633A (en) 1959-02-06 1959-12-21 Method of and apparatus for continuous coating of elongated articles
DE19601506846 DE1506846A1 (de) 1959-02-06 1960-01-25 Foerdervorrichtung fuer langgestreckte Gegenstaende,wie Rohre,bei eine Tauchbadanlage zur UEbergabe der Gegenstaende von einem Laengsfoerderer auf einen Querfoerderer
DE19601251222 DE1251222B (de) 1959-02-06 1960-01-25 Fördervorrichtung für eine Anlage zur Oberflächenbehandlung von langgestreckten Gegenständen
BE587345A BE587345A (fr) 1959-02-06 1960-02-05 Procédé et appareil pour revêtir en continu des objets allongés.

Applications Claiming Priority (1)

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US791612A US3063409A (en) 1959-02-06 1959-02-06 Apparatus for continuous coating of elongated articles

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US3063409A true US3063409A (en) 1962-11-13

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US (1) US3063409A (de)
BE (1) BE587345A (de)
DE (2) DE1251222B (de)
FR (1) FR1246214A (de)
GB (1) GB891633A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3410200A (en) * 1964-06-15 1968-11-12 Vallourec Automatic equipment for galvanizing tubes
US3701336A (en) * 1970-03-16 1972-10-31 Taylor Wilson Mfg Co Pipe coating apparatus
DE2545709A1 (de) * 1974-10-15 1976-04-29 Wheatland Tube Co Vorrichtung und verfahren zum bewegen laenglicher gegenstaende durch ein beschichtungsmaterial
US20190078187A1 (en) * 2016-03-09 2019-03-14 Fontaine Holdings Nv Hot-dip galvanization system and hot-dip galvanization method, in particular for mass production
EP3609823A4 (de) * 2017-05-24 2021-01-13 Steve Kelley Spiralfördervorrichtung zum eintauchen von gegenständen in eine flüssigkeit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017220102A1 (de) 2017-11-10 2019-05-16 Wiegel Verwaltung Gmbh & Co Kg Anlage und Verfahren zum Feuerverzinken von Halbzeugen

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US545430A (en) * 1895-08-27 Eighths to wilbur f
US561712A (en) * 1896-06-09 lynch
US682147A (en) * 1899-06-02 1901-09-03 Harry B Lynch Apparatus for coating pipes or bars.
US947440A (en) * 1909-03-25 1910-01-25 Edwin T Greenfield Mechanism for treating metal and other tubes or rods.
US1851734A (en) * 1927-08-31 1932-03-29 Morgan & Wright Coating machine
US1869324A (en) * 1929-09-19 1932-07-26 Jones & Laughlin Steel Corp Mechanical feed for pipe galvanizing machines
US1935087A (en) * 1930-09-20 1933-11-14 Jones & Laughlin Steel Corp Galvanizing machine
US2326844A (en) * 1941-04-07 1943-08-17 Nat Tube Co Method of continuously galvanizing pipe and the like
US2804841A (en) * 1957-09-03 Pipe treating apparatus
US2906238A (en) * 1955-03-25 1959-09-29 Rome Cable Corp Apparatus for coating conduit sections
US2951491A (en) * 1953-04-22 1960-09-06 Oscar R Olson Apparatus for feeding elongated articles through a bath type furnace

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US545430A (en) * 1895-08-27 Eighths to wilbur f
US561712A (en) * 1896-06-09 lynch
US2804841A (en) * 1957-09-03 Pipe treating apparatus
US682147A (en) * 1899-06-02 1901-09-03 Harry B Lynch Apparatus for coating pipes or bars.
US947440A (en) * 1909-03-25 1910-01-25 Edwin T Greenfield Mechanism for treating metal and other tubes or rods.
US1851734A (en) * 1927-08-31 1932-03-29 Morgan & Wright Coating machine
US1869324A (en) * 1929-09-19 1932-07-26 Jones & Laughlin Steel Corp Mechanical feed for pipe galvanizing machines
US1935087A (en) * 1930-09-20 1933-11-14 Jones & Laughlin Steel Corp Galvanizing machine
US2326844A (en) * 1941-04-07 1943-08-17 Nat Tube Co Method of continuously galvanizing pipe and the like
US2951491A (en) * 1953-04-22 1960-09-06 Oscar R Olson Apparatus for feeding elongated articles through a bath type furnace
US2906238A (en) * 1955-03-25 1959-09-29 Rome Cable Corp Apparatus for coating conduit sections

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3410200A (en) * 1964-06-15 1968-11-12 Vallourec Automatic equipment for galvanizing tubes
US3701336A (en) * 1970-03-16 1972-10-31 Taylor Wilson Mfg Co Pipe coating apparatus
DE2545709A1 (de) * 1974-10-15 1976-04-29 Wheatland Tube Co Vorrichtung und verfahren zum bewegen laenglicher gegenstaende durch ein beschichtungsmaterial
US20190078187A1 (en) * 2016-03-09 2019-03-14 Fontaine Holdings Nv Hot-dip galvanization system and hot-dip galvanization method, in particular for mass production
US10982308B2 (en) 2016-03-09 2021-04-20 Fontaine Holdings Nv Hot-dip galvanization system and hot-dip galvanization method, in particular for mass production
US11525176B2 (en) * 2016-03-09 2022-12-13 Fontaine Holdings Nv Hot-dip galvanization system for large-scale hot-dip galvanization of automotive components
EP3609823A4 (de) * 2017-05-24 2021-01-13 Steve Kelley Spiralfördervorrichtung zum eintauchen von gegenständen in eine flüssigkeit

Also Published As

Publication number Publication date
GB891633A (en) 1962-03-14
BE587345A (fr) 1960-05-30
DE1506846A1 (de) 1969-11-13
FR1246214A (fr) 1960-11-18
DE1251222B (de) 1967-09-28

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