US2685139A - Drier cylinder, particularly for papermaking machinery - Google Patents

Description

1954 M. scHADLER 39 DRIER CYLINDER, PARTICULARLY FOR PAPERMAKING MACHINERY Filed 001:; 21, 1950 \m mi 4 l0 3 5 d o c 2 o o o l,

M 0 O x \NVENTOR MAX LOUIS scH'ADLER B] AT TORNEYS Patented Aug. 3, 1954 DRIER CYLINDER, PA

RTICULARLY FOR PAPERMAKING MACHINERY Max Louis Schadler, Heidenheim (Brenz), Germany, assignor to J. M.

Heidenheim, Germany Voith G. m. b. H.,

Application October 21, 1950, Serial No. 191,347

6 Claims. I

The present invention relates to dryer cylinders and, more particularly, to dryer cylinders with cast iron and covers. The present invention will be described in connection with dryer cylinders for paper making machinery, but it is to be understood that the invention is not limited to this particular field.

Dryer cylinders for the paper making industry, particularly dryer cylinders for machinery with automatic pick-up chinery for machine-glazed paper (M. G. machines), are mad-e up to a diameter of five thousand millimeters. While structurally it would be possible further to increase the diameter of such dryer cylinders, such increase in diameter 1 would, however, make the transport of the cylinders practically impossible.

In order further to increase the efliciency or output of such machine there exists the possibility to raise the temperature of such 20 steam heated cylinders, which amounts to an increase in the pressure. The structures heretofore known, however, permit only a limited increase in pressure, due to the fact that in View of the steam pressure, bending stresses, and heat expansion, the permissible stresses for the cast iron and covers have practically reached their limit.

It is, therefore, an object of the present invention to modify the heretofore known dryer cyl- 3O inder constructions so as to permit the application of high pressures.

It is another object of this invention to provide a dryer cylinder of the above-mentioned type which, while being of rigid and durable construction, will be relatively simple and will not require any material increase in the cost of production. These and other objects and advantages of the invention will appear more clearly from the following specification in connection with the accompanying drawing showing a longitudinal section through a dryer cylinder, embodying the principles of the present invention.

General arrangement the bearing studs which carry the end covers are 55 (Yankee machines) and ma- 10 of the end 50 interconnected by a tubular member having a relatively large diameter which is equal, or approximately equal, the outer diameter of said flanges. In this way, due to the larger transverse section of the connecting tubular member, the bearing capacity is multiplied over the heretofore used shaft extending through the drum. As a result thereof, th end covers will be relieved from the dangerous alternating bending stresses which heretofore were unavoidable.

Structural arrangement Refering now to the drawing in detail, the arrangement shown therein represents a dryer cylinder generally designated I, carried by the stud 2 on the driving side and by the stud 3 on the loader side. As will be clear from the drawing, the studs 2 and 3 are fanning out at their inner end and are thus provided with enlarged flanges 4 and 5, to which the cast iron end covers 5 and l are bolted, or otherwise connected. The end covers 5 and I carry the drum 8 and are connected thereto by bolts or in any other convenient manner.

Interposed between the flanges 4 and 5 and connected thereto in any convenient manner, preferably by welding, i the tubular member 9. The tubular member 9 has a diameter equal, or approximately equal, to the diameter of the flanges 4 and 5. Also, the diameter of the tubular member 9 is preferentially a multiple of the diameter of the bearing studs 2 and 3. The tubular member 9 is provided with apertures It] to permit the passage of steam which is admitted into the tubular member 9 through a steam pipe H extending through the stud 3. The tubular member 9 furthermore, at least partly, supports the dippers i2 and I3 adapted to discharge the condensate into the chamber [5 separated from the remaining part of the structure by the partition M. The condensate is then discharged from the chamber I5 through the stud 3. The clippers l2 and I3 are additionally connected to ribs 15, forming a part of the end covers 6 and I.

It is, of course, understood that the present invention is by no means limited to drying cylinders for machinery with automatic pick-up (Yankee-machines) or machinery for machineglazed papers (M. G. machines). The invention may also be applied in connection with ordinary paper making machines and other drying devices, as for instance used in the textile or dyeing industries. In these industries the cylinders are exposed to high temperatures and high pressures, but for structural reasons or reasons of transporting the cylinders, the cylinders have to be made of relatively small diameter, while the drum and end covers, for technical reasons, have to be made of cast iron.

What I claim is:

1. A dryer cylinder, particularly for paper making machinery, comprising in combination, a first bearing stud, a second bearing stud spaced from said first bearing stud, but arranged in alignment therewith, the ends of said bearing studs facing each other having a flanged portion having a diameter which is a multiple of the bearing diam eter, continuous thin-walled tubular means separate from but rigid with and thus interconnecting said flanged portions and having a diameter approximately equal the diameter of said flanged portions, the diameter of said tubular means being substantially greater than that of said studs, and said tubular means being made rigid with said flanged portions by welding, a pair of annular end covers respectively connected to said flanged portions, and a cylindrical drum connected to and supported by said end covers.

2. A dryer cylinder, comprising in combination, a pair of hollow bearing studs spaced from and arranged in axial alignment with each other, the ends of said bearing studs facing each other being funnel-shaped and having a diameter which is a multiple of the diameter of said bearing studs, with the larger diameter portion of said funnels facing each other, and being provided with a flange adjacent said larger diameter portions, a pair of annular end covers supported by and connected to said'flangcs, a cylindrical drum supported by and connected to the outer periphery of said end covers, a perforated continuous thinwalled tubular member separate from said studs but rigid with and thus interconnecting said larger diameter portions and having an outer diameter approximating the outer diameter of said larger diameter portions, said tubular member having a substantially greater diameter than said studs and being made rigid with said larger diameter portions by welding, and pipe means extending through one of said bearing studs into said perforated tubular member for admitting steam thereto.

3. In a drier cylinder of the nature described; a pair of axially aligned spaced bearing studs,

theends of said studsfacing each other being pro- Q vided with flange'portions extending radially outwardly from said studs a substantial distance, an end cover secured to the outer periphery of each flange portion, a cylindrical cover extending between and connected with the peripheries of said end covers, and end means for strengthening and reinforcing said cylinder to enable it to be employed with a supply of steam to the interior thereof at a pressure and temperature in excess of what is normally employed in a drier cylinder comprising inwardly extending axial flanges on said flange portions adjacent the connection thereof to said end covers, said axial flanges having a substantially greater diameter than the bearing diameter of said studs, said flanges tapering toward the inside of the cylinder, and a continuous thin-walled tubular member of the same diameter a said flanges fitting between said flanges and integrally welded thereto.

4. An arrangement according to claim 3 in which said tubular member is provided with spaced perforations on a portion thereof and at least one of said studs has an axial passage therethrough for the supplying of steam to the interior of the cylinder.

5. An arrangement according to claim 4 in which the said end covers are annularly concave toward the outside of the cylinder for withstanding internal pressures in the cylinder.

6. An arrangement according to claim 4 in which the said tubular member at one end beyond the said perforations therein has a transverse partition forming a chamber with the said one end of the tubular member and the flange portion of the adjacent bearing stud, and dipper means carried by said tubular member for dipping condensate from said cylinder as it rotates and connected to deliver the said condensate to said chamber.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,693,934 Millspaugh Dec. 4, 1928 2,328,321 Berry Aug. 31, 1943 2,486,719 Messinger Nov. 1, 1949 2,563,692 Ostertag et al Aug. '7, 1951 FOREIGN PATENTS Number Country Date 20,470 Great Britain 1896

Images