US3722463A - Tube coating apparatus - Google Patents

Tube coating apparatus Download PDF

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Publication number
US3722463A
US3722463A US00172506A US3722463DA US3722463A US 3722463 A US3722463 A US 3722463A US 00172506 A US00172506 A US 00172506A US 3722463D A US3722463D A US 3722463DA US 3722463 A US3722463 A US 3722463A
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US
United States
Prior art keywords
tubes
tube
metal
set forth
passage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00172506A
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English (en)
Inventor
M Kudo
N Niwa
A Okita
K Yoshimura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Sumitomo Metal Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
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Publication of US3722463A publication Critical patent/US3722463A/en
Anticipated expiration legal-status Critical
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    • 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
    • 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
    • Y10S118/11—Pipe and tube outside
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49838—Assembling or joining by stringing

Definitions

  • a galvanizing apparatus includes means connecting dividual lengths of tube sections by assembly of a con- [52] U.S. Cl. ..118/6, 29/433, 118/405, nector element therewith, means to convey the assem lls/DIG' 219/] P bled sections through a plurality of treating stations, [51] Int. Cl ..BOSC 11/122 means to thereafter disconnect the tube sections and [58] Field of Search, ..118/4, 6, 7, 8, 2, 65, 67,
  • the present invention relates to an apparatus for forming galvanized coating with molten metal on only outer surfaces of steel tubes.
  • Steel tubes galvanized in outer surfaces with molten metal have the wide range of use as, for example, structural pipe, conduit tube, refrigerator tube, and so forth.
  • several processes have been already introduced, for example,
  • the galvanized coating on the inner surface only is dissolved away by, for example, acid while the coating on the outer surface is protected from the acid;
  • the tubes are assembled beforehand into a structure ready for use and then only outer surfaces thereof are coated by galvanizing.
  • the present invention provides an apparatus for drastically obviating these disadvantages of the conventional processes for galvanizing of exterior surfaces of tubes with molten metal. More particularly, the present invention provides an apparatus for practicing the process for forming uniform coating with molten metal on only outer surfaces of tubes by performing all such steps continuously and automatically on a series of conveyors without necessity to use inert gas, as connecting individual tubes of any length lengthwise with connecting members having communicating holes or with connecting members of adhesive material, sealing hermetically the leading end of the connected tubes, rendering such pretreatments continuously as.
  • FIG. 1 is a schematic flow diagram of the continuous galvanizing system
  • FIGS. 2A, B and C are side views of tube connecting means showing the step of connecting the tubes continuously on the roller conveyor;
  • FIG. 3 is a side sectional view of the molten metal kettle for continuously contacting the molten metal to the outer surface of the tube;
  • FIG. 4 is a cross sectional view taken along the line IvIV of FIG. 3;
  • FIGS. 5A, B and C are side views of the connected tube disconnecting means showing the step of disconnecting the connected tube continuously;
  • FIG. 6 is a plan view of a tube sealing joint.
  • FIG. 1 An embodiment of the present invention is described in detail below with reference to the drawings.
  • individual tubes 4 of arbitrary length given pretreatments such as degreasing and pickling are placed on inclined transfer table 1, ends of the tubes 4 are aligned in a line by an ordinary stopper (not illustrated), and a sealing joint 5 which is to be described below with reference to FIG. 6 is pushed into the end of the tube 4 by inserting means 3.
  • the individual tubes 4 thus prepared are placed in order on roller conveyor 30.
  • the individual tubes 4 are advanced to tube connecting means 40 which is to be described below with reference to FIGS. 2A, B and C where ends of the tubes are connected to each other by means of the sealing joints 5.
  • the connected tube 4 passes through spray distributor 12 of flux solution (for example, a solution of mixture of zinc chloride and ammonium chloride) and excess solution remover 13 for blowing off compressed air and advanced into ordinary tunnel-type heating furnace 14.
  • flux solution for example, a solution of mixture of zinc chloride and ammonium chloride
  • excess solution remover 13 for blowing off compressed air and advanced into ordinary tunnel-type heating furnace 14.
  • the excess solution sticking to the outer surface of the tube is removed by, for example, compressed air blown off by the excess solution remover 13 to facilitate the preheating of the tube of the succeeding step.
  • Such pretreatments as degreasing and pickling may be rendered by, for example, showering before flux treatment.
  • the connected tube 4 is heated to the predetermined temperature (in galvanization of zinc, for example, surface of the tube is heated to cess coating by the excess coating remover 28 blowing off compressed air and is cooled by shower-type cooler 29.
  • the cooled connected tube 4 is disconnected into the former individual tubes 4 by connected tube disconnecting means 60 which is to be described below with reference to FIGS. 5A, B, and C, and advanced to product transfer table 36.
  • said sealing joints 5 are removed from the ends of the tubes by clamping remover 37 and returned to the vibration feeder 2 by belt conveyor 38.
  • the sealing joint 5 is provided with a larger diameter portion 52 at the central part, slightly tapered smaller diameter portions 51 at both sides of the larger diameter portion 52, and substantially tapered end portions 53. And a hole 54 is provided along the central axis of the sealing joint 5. Ends of an individual tube surround the both smaller diameter portions 51 and are stopped by the larger diameter portion 52.
  • the hole 54 of the sealing joint 5 acts, when the tube is heated, as a vent to let the air expanded within the tube escape to the atmosphere through the succeeding tubes. But, at the foremost and outermost ends of the connected tube, sealing joints having no hole are used.
  • the sealing joint 5 is made of such material as may be capable of preventing the cooling water from flowing into the tube, free from damage by repeated use, and having a proper degree of fittable and removable property, for example, wood, soft metal, synthetic resin, and so forth.
  • the tube connecting means 40 is described below with reference to FIGS. 2A, B, and C.
  • tubes 4 each having a sealing joint 5 fitted thereto are advanced in order automatically to magnet roller 7 of the roller conveyor 30, and switching the limit switch 11 on to start the roller 7, the pipes 4 are advanced further.
  • Peripheral speed of the magnet roller 7 is determined to be 2 3 times that of the forward roller 8 of the roller conveyor when the limit switch 6 is switched on.
  • the magnet roller 7 is accelerated to make the front end of the tube 4 on itself collide with the rear end of another tube 4a advancing in front of the tube 4 from behind (see FIG.
  • the connecting of the tubes may be performed in the method wherein the roller 7 is freely rotated and the tube 4 on the roller 7 is pushed into the another tube by a pusher operated, for example, by an air cylinder.
  • heating furnace 14 It is not necessary to maintain the non-oxidizing atmosphere within the heating furnace 14 under the ordinary heating condition wherein the composition of the flux chrystallized film of the outer surface of the tube does not change in the heating furnace, oxidizing of the outer surface is prevented, and forming of the coating of the molten metal can be accelerated in the next step.
  • the heating condition is extremely strong, inside of the heating furnace 14 may be maintained under non-oxidizing atmosphere by introducing, for example, an inert gas thereinto.
  • Heat source of the heating furnace 14 may be the heat of exhaust gas from the metal melting furnace and combustion in the auxiliary combustion means (heavy oil, gas,.etc.) for temperature control.
  • Feeding and storing method of the molten metal is described in detail below with reference to the FIGS. 3 and 4.
  • Molten metal 16 (the temperature of, for example, zinc, is between 460 and 470C) within the kettle 15 is pumped up by pump 17, passes through passages 20 and 21, and is transferred into storing case 18 from feed openings 22 and 22a.
  • the feed openings 22 and 22a are disposed with the angle of projection of 35 40 with respect to the horizontal plane.
  • the molten metal forms fluxes of stream along damper guides 23 and 23a in the direction of the extension of the feed openings 22 and 22a within the storing case 18, and the fluxes of stream themselves act like embankments to minimize overflow of the molten metal through the clearance between the openings 19 and 19a of the damper guides 23 and 23a and the outer periphery of the tube 4.
  • the molten metal 16a is stored inside the both streams.
  • the inside of the store case 18 is isolated from the external atmosphere by the fluxes of stream along the damper guides.
  • the inside of the case 18 and the overflow opening 25 are maintained under non-oxidizing atmosphere, there is no oxidizing of the molten metal and, accordingly, there is no necessity to introduce an inert gas within the store case 18.
  • the galvanizing amount of about 400 g/m can form the coating of about 20 60p. of thickness.
  • the connected tube disconnecting means is described below in detail with reference to FIGS. 5A, B
  • the connected tubes 4, 4a are carried on the roller conveyor 30 and advanced onto the rollers 8a and 8b.
  • the connected tubes 4, 4a pass the rollers 80 and 8b to make the limit switch 31 on as shown in FIG. 5B, the peripheral speed of the magnet roller 7 is accelerated to 2 3 times of that of the rollers 8a and 8b to disengage the connection between the preceding tube 40 and the succeeding tube 4.
  • the limit switch 32 is made on by the preceding tube 4a
  • the peripheral speed of the magnet roller 7 is decelerated to the same to that of the rollers 8a and 8b, and the tube 4a is transferred from the roller conveyor 30 to the product transfer table 36 shown in FIG. 1 by the operation of the air cylinder 35.
  • the advancement of the tube on the roller conveyor may be carried out inclining the roller to give rotation to the pipe so as to equalize the flux coating, heating, and metal coating on the outer surface of the tube.
  • the present invention capable of forming a uniform coating of a molten metal on the outer surface only of steel tube, has such great advantages that all the steps are carried out continuously and automatically on the conveyor, the process and system of this invention can apply to any length of tubes if only sufficient spaces are provided at both ends of the conveyor line, without necessity of human labor and of introducing an inert gas to maintain non-oxidizing atmosphere within the system. And, therefore, the present invention can reduce manual operation and improved production efficiency greatly.
  • a system for continuously coating outer surfaces of elongated steel tubes with a molten galvanizing metal comprising:
  • a. conveying means for longitudinally and sequentially conveying a plurality of said tubes in a path;
  • automatic connecting means including a sealing joint, for connecting each tube while being conveyedtoa longitudinally adjacent tube;
  • a container adapted to hold said metal, said path extending from said connecting means through said container for coating of the connected tubes;
  • feeding means for feeding said metal to said container
  • disengaging means for disengaging the coated tubes after passage through said container
  • connecting means include inserting means for pushing a sealing joint into an end of one of two tubes adjacent the other tube to be connected to said one tube, and means for varying the speed of said two tubes relative to each other until said joint is also inserted into an end of the other one of said two tubes.
  • disengaging means include means for varying the speed of two adjacent coated tubes until said two tubes are moved apart and said joint is released from one of said two coated tubes, and pulling means for pulling said joint from the other coated tube.
  • system as set forth in claim 4 further comprising means for removing an excess of said metal from the coated tubes after said passage, and cooling means for showering the coated tubes after removal of said excess with a fluid coolant.
  • said conveying means include a plurality of magnetic rollers, and drive means for rotating said rollers, at least one of said speed varying means including means for rotating respective rollers at different speeds.
  • said feeding means include a kettle adapted to hold said molten metal, said container being disposed within said kettle and formed with a circulating passage and an overflow, and pump means for feeding said metal from said kettle to said passage at a rate sufficient for circulating said metal through said passage and said overflow.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
US00172506A 1970-08-19 1971-08-17 Tube coating apparatus Expired - Lifetime US3722463A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45073063A JPS5017420B1 (enExample) 1970-08-19 1970-08-19

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5172931A (ja) * 1974-10-15 1976-06-24 Sumitomo Metal Ind Boshokuhifukukokan
FR2431329A1 (fr) * 1978-05-19 1980-02-15 Neturen Co Ltd Dispositif pour le revetement en continu de barres en acier pour beton precontraint non agglomere
DE3409935C1 (de) * 1983-11-11 1985-04-18 Hoesch Ag, 4600 Dortmund Verfahren und Einrichtung zum Feuerverzinken von Rippenrohren
US4814210A (en) * 1984-11-09 1989-03-21 Werner Ackermann Process and means for hot-dip galvanizing finned tubes
EP0575728A1 (en) * 1992-06-24 1993-12-29 Daiwa Steel Tube Industries Co., Ltd. Method for the continuous manufacture of metal-plated steel tubes by molten metal plating treatment
US5449447A (en) * 1990-10-08 1995-09-12 Le Four Industriel Belge S.A. Method and device for pickling and galvanizing

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5295822U (enExample) * 1976-01-14 1977-07-18
JP6769276B2 (ja) * 2016-12-08 2020-10-14 日本製鉄株式会社 溶融亜鉛めっき鋼管および溶融亜鉛めっき鋼管の製造方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1263858A (en) * 1917-12-27 1918-04-23 William L Cole Apparatus for applying coatings to bars, rods, pipes, &c.
US1762239A (en) * 1926-09-17 1930-06-10 Babcock & Wilcox Tube Company Method of coating articles with enamel
US2287825A (en) * 1938-07-30 1942-06-30 Standard Oil Co California Apparatus for cooling coated pipe
US3120460A (en) * 1964-02-04 Figure
US3151549A (en) * 1959-02-11 1964-10-06 Warren S D Co Electrically inscribable lithographic masters
US3161530A (en) * 1959-08-10 1964-12-15 Minnesota Mining & Mfg Coated pipe and process
US3620805A (en) * 1969-03-17 1971-11-16 Carl Martin Method for the continuous hot galvanizing of continuously formed elements

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3120460A (en) * 1964-02-04 Figure
US1263858A (en) * 1917-12-27 1918-04-23 William L Cole Apparatus for applying coatings to bars, rods, pipes, &c.
US1762239A (en) * 1926-09-17 1930-06-10 Babcock & Wilcox Tube Company Method of coating articles with enamel
US2287825A (en) * 1938-07-30 1942-06-30 Standard Oil Co California Apparatus for cooling coated pipe
US3151549A (en) * 1959-02-11 1964-10-06 Warren S D Co Electrically inscribable lithographic masters
US3161530A (en) * 1959-08-10 1964-12-15 Minnesota Mining & Mfg Coated pipe and process
US3620805A (en) * 1969-03-17 1971-11-16 Carl Martin Method for the continuous hot galvanizing of continuously formed elements

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5172931A (ja) * 1974-10-15 1976-06-24 Sumitomo Metal Ind Boshokuhifukukokan
FR2431329A1 (fr) * 1978-05-19 1980-02-15 Neturen Co Ltd Dispositif pour le revetement en continu de barres en acier pour beton precontraint non agglomere
US4243447A (en) * 1978-05-19 1981-01-06 Neturen Company Ltd. Method for continuously forming a coating layer on unbonded PC steel bars
DE3409935C1 (de) * 1983-11-11 1985-04-18 Hoesch Ag, 4600 Dortmund Verfahren und Einrichtung zum Feuerverzinken von Rippenrohren
US4814210A (en) * 1984-11-09 1989-03-21 Werner Ackermann Process and means for hot-dip galvanizing finned tubes
US5449447A (en) * 1990-10-08 1995-09-12 Le Four Industriel Belge S.A. Method and device for pickling and galvanizing
EP0575728A1 (en) * 1992-06-24 1993-12-29 Daiwa Steel Tube Industries Co., Ltd. Method for the continuous manufacture of metal-plated steel tubes by molten metal plating treatment

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Publication number Publication date
JPS5017420B1 (enExample) 1975-06-20

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