US1580891A - Apparatus for coating and treating metallic materials - Google Patents

Description

April 13 1926. 1,580,891

i J. vl... HERMAN APPARATUS FOR GOATING AND TREATING METALLIC MATERIALS Filed June 26, 1925 v IIL.

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y Patented Apr.`13, 1926.

UNITED STATES APATENT OFFICE JOSEPH L. HERMAN', 0F PEORIA, ILLINOIS, ASSIGNOR TO MIDLAND UFACTURING `COMPANY, OF PEORIA, ILLINOIS, A CORPORATION F ILLINOIS. s

APPARATUS FOR COATING AND TREATING METALLIC MATERIALS.

Application led June 26, 192,5. Serial No. 39,729.

To atl whom t may concern.' Be it kno-wn that I, JOSEPH L. HERMAN, a citizen of the United States, residing at Peoria, in the county of Peoria and State of Illinois, have invented new and useful Improvements in an Ap-paratus for Coating and Treating Metallic Materials, of which the following is a specification.Vv

This invention has reference to an apparatus for coating and treating materials having an iron or steel baseand particularly the coating and treatment of sheets used for fabricated articles, structures and other purposes. l The invention has for its principal object to provide an apparatus for carrying out lthe process shown and described in Letters Patent of the United States, issued to me October 3, 1922, No. 1,430,648, for a recessl of 'coating and treating' materials 4aving an iron base, and being an improvement upon the invention, improvements in an a 4paratus for coating ,and treating meta ic materials, for which application for Let-- ters Patent of the United States lwas led by me April 26, 1923, bearing Serial No. 634,77 3.

The invention has for a further object an apparatus of the character described, including a heat-treating furnace through which the coated sheets are conducted immediately upon their leaving the molten-bath, and in whichl the coated sheets are heat-treated; such treatment having for its object to pro- 85 duce a coating more resistant to atmospheric rusting and corroding conditions than for ordinary galvanized sheets and which further will permit a heavier coated sheet v to be fabricated without causing the coating 40 to'crack or Hake off as is the case with heavier coated sheets coated by means of an ordinary galvanized apparatus. The resultant sheet' forms a matte surface in contredistinct'ion to the ordinary galvanized sheet y which has a spangled surface. The said matte surface is of such a character that it will receive paint, enamel and the like which will firmly attach themselves to the surface as against the necessity for using other means to prepare an ordinary galvanized sheet to receive similar treatment.

A further object of the invention is a galvanizing apparatus, including a heat-treatgalvanizing apparatus', including and;

ing furnace adapted for the heat-treatment of sheets limmediately upon the sheets leav ing the molten-bath, such furnace embodying one or. more heat-treating chambers throu h which the coated sheets are conducte the sheets beingv adapted to be heattreated byk means of heat radiated from theA walls of the chamber, the fuel employed for heatingl the furnace'comprising oil, gas, or any ot er well known heating means.

A further object of the invention is a a furnace for heat-treating sheets immediately upon their leaving the molten-bath, suitable-conducting devices for the sheets being located to conduct the sheets'through the heat-treating furnace.

A still further object of the invention is the provision of a Aheat-treating furnace in a galvanizing apparatus adapted for the heattreatment of sheets immediately upon their leaving the molten-bath. The ingress and egress openings for the sheets at the front and rear ends ofthe furnace being reduced to a minimum and constructed so 'asto practically prevent the infiltration of cold air into the heat-treating chambers 'of such furnace.

That the invention may be more fully understood, reference is had to the accompanying drawings forming part of this application', illustrating a preferred embo iment of the invention, in which:

Figure 1 is a longitudinally sectional view on a greatly reduced scale partly broken away illustrating an apparatus embodying the invention herein, the sheet galvanizing tank and associated parts being shown in dotted lines and larrows being emplo ed to showthe course of the sheets throng such tank and heat-treating furnace and 'also showing the manner in which the heat passes through the heat-treating furnace.

Fi re 2 is lan end-vlew of one end of the urnace as thesame would appear on the line 2-2Figure 1;

Fi re 3 is a crosssection as the same woul appear on vthe. line v3--3 Figure 1,

. Figure 4 is across section as the same would appear on the line 4-4 Figure 1.

Like characters of reference indicate corlol responding parts throughout the figures.

lin the drawings and in particular -Figure 1 there is illustrated by dotted lines a galvanizing tankl, suchas is commonly used for containing molten zinc used for coat-ing sheets, which is well known to those skilled in this art. Tanks of this character and used for the purposes herein described include at the entrance end of the tank feeding-in rolls 2, at the discharge end of the tank discharging or exit rolls 3 and guiding rolls 4 located within the tank mediate its ends. All such rolls are usually positively driven, although such-driving or operating means for tie rolls are not shown due to their being commonly and well known in the art. l

Adjoining the tank 1 and extending away therefrom at the discharge end thereof and for the purpose of heat-treating the coated sheets as they leave the coating tank, is a heat-treating furnace 5 provided, as shown, with a longitudinally disposed heat-treating chamber 6 through which the coated sheets are conducted and heat-treated. While li have shown only one heat-treating chamber 6 it is understood that it is contemplated that one or more such chambers may be provided, depending upon the scope and use of the invention. The walls of the heattreating chamber 6, are subjected to ,heat from the products of combustion formed by the burning of a suitable fuel which finds entrance to the furnace through ports f7, see Figures 1 and 3, on either side of the furnace and which traverses the furnace longitudinally and i transversely thereof through the respective passages or flues 8, 10 and 11. Somewhat in the manner shown by the arrows in Figures 1, 3 and 4. Comy municating ports 9 are provided at the front and rear ends of the furnace between the Vfines 8 and 11, and 10 and 11 respectively so as to insure a complete transference of the heat from the products of combustion to the respective walls of the heating chamber 6; the products ofcombustion finally escaping from the furnace through the stack 12.

13 designates a conveyor or conductor, preferably in the form of a plurality of endless chains which traverse `the heating chamber from front to rear, asrbest seen in Figure 1, and said chains operated by sprocket wheels 14 connected with a shaft 15 having secured thereon a gear wheel 16 in mesh with a pinion 17 on a driving shaft 18 provided with a pulley wheel 19 which may be operated by a belt from any suitable source of power. This operating mechanism is located conveniently at the rear end of the furnace and the 'sheets conducted by the conveyor 13 throughthe furnace may be discharged from such conveyor 13 on to a cooling rack, not shown., At the forward end of the furnace and at the entrance to the heating chamber 6 are guiding sprocket wheels 20 on a shaft 21 and at the base of the furnace at the forward end are other guiding sprocket wheels 22 on a shaft 23. It being arranged that the conve or chains 13 traverse the heating chamber rom front to rear, thence down and under the furnace and back into the heating chamber, as shown. l

Extending forwardly from the heating chamber 6 and in communication therewith vis a hood 24 which is curved forwardly and downwardly and preferably with an enlarged mouth which overlies and preferably projects a short distance in to the coating tank l in proximity to or in association with the discharging rolls 3 so that the sheets which are coated in the" tank and then discharged therefrom by the rolls 3 will be directed upwardly and inwardly through the hood 24 into the heating chamber 6 and on to the conveyor chains 13 which convey such coating sheets through the heat-treating chamber for the heat-treating of such coated sheets. At the rear end of the furnace li provide the hinged .gate 25 which normally assumes the closed position shown in Figure 1. rllhis gate 'and the hood 24 function to restrict and prevent, as far as possible, the infiltration of cold air into the heattreating chamber so that an approximately uniform temperature may be maintained in said chamber. This object is further attained by the construction of the shield 26 at the forward end of the furnace, which acts as a housing and embraces the meeting ends of the tank and the furnace as shown, up between 'which the conveyor chains 13 have passage and such shield and hood may be united in any suitable manner, the shield serving as a support for the hood.

The coating tank 1 with the feeding, guiding and discharging rolls, as stated, are not into the hood of the furnace through and by means of the discharged rolls 3, the coating sheets being fed on to the conveyor chains 13n and by the latter conducted through the heating chamber 6 where the coating is heat-treated and such coated and heat-treated sheets discharged from the rear end of the furnace'and on to the cooling table .referred to. fihe temperatures employed maybe one of practice andthe furnace may e of any suitable length consistent with the results to be obtained.

1. An, apparatus for galvanizing sheets comprising in combination, means forcon tinuously coating the sheets, a furnace for heat-treating the coated sheets, including a heat-treating chamber through which the coated sheets pass asI they leave the coating means( a conveying means for carrying the `sheets throughy the furnace and means at either end of the,heat-treatingchambers for retarding or reducing to a minimumthe infiltration and circulation of air in said heattreating chambers.

2. An apparatus for galvanizing sheets comprisin in combination, a sheet galvanizing tan a heat-treating furnace next adjacent the'tank, conveying means `for conveying the coated sheets through the tank,

and means at either end of the furnace for through which the coated sheets pass from the galvanizing tank to the furnace.

3. An apparatus for galvanizing sheets comprising in combination, a galvanizing tank, a heat-treating furnace next adjacentthe tank, having a heat-treating chamber through which the coated sheets are conducted, a continuously operated means to conduct the coated sheets through said heattreating chamber, and a hood forming a continuation ofthe heat-treating chamber and leading from the receiving end thereof to the discharge point of the galvanizing tank, whereby the coated Sheets may be discharged from the galvanizing tank and conveyed to and through thefurnace without being exposed to the action of the atmosphere.

JOSEPH L. HERMAN. i

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