US1657212A

US1657212A - Fluid-cooled roll

Info

Publication number: US1657212A
Application number: US161105A
Authority: US
Inventors: Halbert K Hitchcock
Original assignee: Pittsburgh Plate Glass Co
Current assignee: PPG Industries Inc
Priority date: 1927-01-14
Filing date: 1927-01-14
Publication date: 1928-01-24
Anticipated expiration: 1945-01-24

Description

H.K.HHCHCOCK FLUID cooLED ROLL Filed Jan. 14, 1927 3 Sheets-Sheei l mw. Qn, mm WN Qn s N NNT H J M E Jan.24,l928.

H. K. HITCHCOCK FLUID COOLED ROLL Filed Jah. 14, 1927 5 sheets-sheet 2 oaaIllllllrllllllllltllllhlrllltllllllllll I l llllllll allllnllll lnallnlllvllllllllllnlla: uit! N .mi

Jan. 24, 1928, 1,657,212

H. K. HiTCHCOCK FLUID COOLED ROLL Filed Jan' 14, 1927 3 Sheets-Sheet 5 Mg., m 35 15 d'2/- J'CJMQM INVENTOR Patented Jan. 24, 1928.

UNITED STATES PATENT OFFICE.

HALBERT K. HITCHCOCK, F PITTSBURGH, PENNSYLVANIA, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, T0 PITTSBURGH PLATE GLASS COMPANY, A CORPORA- TION OF PENNSYLVANIA.

FLUID-COOLED ROLL. l

,Application filed January 14, 1927. Serial No. 161,105.

The invention relates to fluid cooled rolls for use in glass rolling or drawing apparatus, such as that shown in the patent to Frederick Gelstharp No. 1,560,079 of November 3, 1925. or that shown in my Patent N o.

1,538,327 of May 19, 1923, although not limited to use in the particular apparatus of said patents. The invention has for its principal objects; the provision of a roll which l will not warp when exposed to the unusually severe conditions met in rolling glass; the provision of a roll in which there is no opportunity for uneven heating, due to the maintenance of air orV steam pockets on the "5 upper side of the roll; the provision of a roll wherein the cooling water may be delivered at the center of the roll with a minimum reduction in temperature therein incident to its travel from the ends to the center of the roll; the provision of a construction in which the temperature of the portion of the roll contacting with the glass is under control from the center of such portion to its ends,

and may, therefore, be maintained uniform,

25 and may be increased and decreased at will to meet varying temperature requirements incident to variations in speed in rolling the glass ribbon or sheet. ll`he arrangement is such that by varying the volume of flow of 3" the cooling liquid and the temperature of such liquid, the temperature conditions along the roll may be made uniform and increased or decreased to meet all requirements.

Briefly stated, the foregoing results are secured by insulating the conduit which carries the cooling liquid to the center of the roll, and by the use of haihes located in the annular passageway surrounding the conduit and having passages or ports adjacent their wird of the inlet conduit. in increased cooling capacity is also secured by counterboring the working section of the roll, so that the walls of such sectionaregreatly reduced in thickness, thus increasing the rapidity of heat transfer from the glass to the water corre spondingly. @ne embodiment of the invention is illustrated in the accompanying drawings, wherein:

one of the rolls. Fig. 2 is a sectional view showing the relation of the rolls to the glass' peripheries of a combined area less than that Figure 1 is a longitudinal section through packing glandsl at the ends of the roll, Fig. 4 being an end View, and Fig. 5l a transverse section. Fig. 6 is another enlarged sectional detail. Fig. 7 is a longitudinal sectionthrough one .partof the inlet tube. Figs. 8 `and 9 are detail views of the expansible baffles used, Fig. 8 being a face view of the bathe and Fig. 9A an edge view. And Fig. l0 is a section through the end of the roll.

Fig. 2 illustrates the application of the rolls to a tank structure 1, such as that shown in the Grelstharp` patent heretofore referred to, the glass sheet 2 beine* withdrawn over a water cooled platen or ta le 3 into the roller leer 4. The sheet is withdrawn continuously through the leer, where it is annealed and its temperature reduced so that it may be cut into sections as it emerges from the leer. 5, 5 are the rolls to which the present invention is directed.

Referring to Fig. 1, 6 is the casing of the roll which is formed of any suitable material, such as cast iron, or cast steel and which has its central portion, which is in contact With the glass sheet 2, of larger diameter than the end portions 7 7, which are engaged by the bearings supporting the roll. The central portion ofthe roll is counterbored between the. points a, a in order to give a relatively thin wall at 8 and thus facilitate a rapid cooling of the glass from the water which is circulated through the casing, as later described. The ends of the casing carry the swivels 9, 9, each of which is provided with a pair of

pipes

10, 10 and 11, 11, the pipes 10, l0 being the inlet pipes for the supply of cooling liquid, and the

pipes

11, 11 being the outlet pipes, The swivels are provided with suitable grooves and passages adapted to register with

suitable passages

13, 13 through the walls of the casing and packing 15 is provided for preventing any leakage of liquid past the. swivel, these details of construction corresponding to those in my Patent No. 1,598,721, so that no detailed descri ption is necessary. The packing is pressed inward by means of the bolts 16 carried by the ring 17 held rigidly upon the casing by means of set screws. The casing is closed at its right hand end by means of the plate 18 secured by the bolts 19 and having integral therewith the tumbler shaft end 20 for rotating the roll. The other end of the casing is closed by the plate 21 similarly held in place by the bolts 22.

Extending longitudinally: of the casing from one end to the other is the inlet tube 23.` This pipe is perforated at its central portion,l as indicated at 24 in Fig. 3 and is surrounded at this point by the casting 25 having perforations 26 corresponding to the perforations 24 so that cooling fluid which is circulated inward through the tube 23 from its ends will flow outward at this central portion into the annula.` space 27a. The outer ends of the tube 23 are open and in .ommunication with the chambers 28a, 28l it the ends ofthe casing, and these chamoers are supplied with water under pressure from the

pipes

10, 10. The annular chamber 27 is in communication at its ends with the

outlet passages

11, 11, so that provision is made for a circulation of water between the pipes'lO and 11, such water passing inward through the tube 23 to the central perforations 24, and then outward into the chamber'27L and longitudinally of the casing in both directions to the

outlets

11, 11. Surrounding the tube 23, and concentric therewith is a second casing made up of the

sections

26, 26 and 27, 27. Each section 26 has a plate 27b brazed to its outer end and a sleeve 28 brazed to its inner end and the space between the

tubes

23 and 26 is filled with a suitable insulating medium, such as asbestos cement. Each of the sections 27 has brazed in its outerend, the casting 25 heretofore referred to. The space between the tube 23 'and the casing 27 is also filled with an insulating medium 27, such as the asbestos cement. The plug 29 also has its tapered end brazed to the tube 23 and the i tubes 27. are also 'brazed to the castino' 25.

-Interposed between the opposing ends of the

sections

26 and 27" are the

baille plates

30, 30, shown 'in detail in Figs. 8 and 9. When these plates are positioned, as indicated in Fig. 1they fit around the plugs 29 and are'clamped between the edges of the

sections

26 and 27. These baie plates, in order to -be positioned, must be made so that they can expand and contract, other wise, they could not be gotten through the end sections of the casing 6, which are of less diameter than the annular chamber 271. The battles are preferably-made of two sets of overlapping

plates

32 and 33 hinged toether by the rivets 34. The ends of this exible annular ring merelyoverlap so that by pressing the edges inward and causing still more overlapping, the devices may be contracted so that they will squeeze through the reduced end sections of the casing 6 and restupon the inclined faces of the pluOs 29. Theyl 'are then pushed to the position s own byt slipped over the tube 23 and moved inward until the pprts are brought to the position shown in ig. 1.

Fitting over the extreme outer ends of the` e ends of the

sections

26, 26, which are tube 23 are the

gland members

35, 35, whose inner faces engage the plates 27b brazed to the ends of the

sections

26, 26. A presser member 36 (Fig. 5) ts over the'outer end of each member 35 for compressing the packing in the groove 37. The members 35 are pressed inward against the plates 27 by means of the lock ring 38, screw threaded upon the ends of the tube 23. This lock ring or nut is provided with suitable projections, as shown in Fig. l for engagement with a wrench, so that by the application of turning power at this point, the

sections

26, 26 are moved inward, clamping the

plates

30, 30 in position. The presser member 36 is movedinward to compress the packing in the groove 37 by means of the nuts 40 on the studs 41, such studs being threaded into the members 35 at their inner ends. The studs are positioned so that their outer ends come about one-fourth inchfrom the

plates

18 and 21. They thus act as spacing devices to Vprevent any substantial longitudinal movement of the tube 23 and the parts carried thereby.

1n order to permit the passage of liquid past the

baiiie plates

30, 30,' and to insure a uniform flow of the liquid around the periphery of the roll, these plates are preferably notched around their peripheries, as indicated at 42 in Fig. 8. The outward flow of water through the annular chamber 27n is thus distributed uniformly past the edges of the peripheries of the plates 30. This is o advantage, since any air or steam which might tend to accumulate in the annular chamber 27:L will normally lie adjacent the upper side of the chamber and will, therefore, be swept out freely by the high Velocity through the notches 42. This is important, in the case of the lower roll where the formation of an air or steam pocket alongthe upper side of the chamber 27 a would normally cause an overheating of the roll opposite the pocket with a resultant tendency to warp the roll and chill the glass passing thereover unevenly. The total cross sectional area of the notches 42 of each `baille is made somewhat less than the cross sectional area of each pipe 10, which insures a uniform iow of cooling liquid through each of the notches and also insures that the annular chamber 27l1 shall always be completely filled with water. In order to remove the plates 30, they are each provided upon their outer sides with a loop 43 so that after the sections 26 have been removed, the loops may be engaged by suitable hooks and the plates pu-lledV out through the ends of the casing 6.

The insulating of the water supply tube 23 is an important feature of the invention. as it permits a supply of water to the central portion of the casing without any substantial rise in the temperature of such water be cylindrical casing,

fore it reaches the center of the casing. Without such insulation, the water would be heated to a substantial degree by the outflowing water from the center of the casing, which is heated to a considerable degree by the time it reaches the end of the casing. It is desirable that the casing receive its greatest cooling effect at its center, where the heating effectfof the glass passing over the roll is greatest.. By regulating the temperature of the water as it enters the ends of the casing, any desired degree of cooling of the glass sheet may b e secured and this control is still further increased by varying the quantity of water which is supplied through the pipes 10, l0. This permits a wide variation in the speed of rolling to meet requirements, the degree of cooling increasing as the speed of rolling is increased, such increase in cooling being required by the passage of a larger quantity of glass over the roll.` The provision of the insulated supply tube in conjunction with the

baffles

30, 30 notched at their outer ends has been found to secure a very uniform coolingof the portionof the rollwith which the glass contacts, so that any tendency of the glass to warp due to unequal cooling across its width is avoided andall warping of the roll is avoided so that a-'sheet of uniform thickness from edge to edge is secured. This result has been found to obtain in operating the roll at varying speeds. Other advantages incident to the construction, some of which have been referred to in the statement of the invention, vwill be apparent to those skilled in the art. Yhile the same results might be obtained by having the

bafHes

30, 30 smaller in diameter than the inside of the casing, thus roviding annular spaces between the ba es and the casing, the notched arrangement is preferred as giving the most accurate and certain results.

' What I claim is:

1. In combination in a glass roll, an outer a liquid supply tube eX- tendinfr through the roll and comprising a pair ol? concentric pipeswith an insulating medium therebetween, with the outer pipe spaced away from the inner wall of said casing to provide an annular chamber and with ports giving communication betweenl the central portion of the inner pipe and said annular chamber, and means for supplying a cooling fluid to the inner pipe under pressure, outlets being provided from the ends of said annular chamber.

'2. In combination in .a glass roll', an outer cylindrical casing, an insulated tube concentric with the casing and discharging at the central portion thereof into the space between the roll and the casing, means for supplying a cooling fluid under pressure to said tube and means for withdrawing the fluid from the ends of the casing.

3. In combination in a glass roll, an outer cylindrical casing, a tube having a hollow wall with insulating material therein concentric with the casing and discharging at the central portion thereof into the space between the roll and the casing, means for supplying a cooling fluid under pressure to said tube and 'means for withdrawing thefluid from the ends of the casing.

4. In combination in a glass roll, an outer cylindrical casing, a supply tube concentric with the casing and discharging at the central portion thereof into the s ace between thc tube and the casing, means for supplying a cooling fluid under pressure tothe tube, means for withdrawing the fluid from the ends of the casing, and bafdes in the annular space between the casing and tube at points intermediate the center and ends of the casing, each of said baffles having discharge means around its outer periphery.

5. In combination in a glass roll, an outer cylindrical casing, a supply tube concentric with the casng and discharging at the central portion thereof into the space between the tube and the casing, conduit means for supplying a cooling fluid under pressure to the tube, means for withdrawing the fluid from the ends of the casing,`pand baffles in the annular space between the casing and tube at points intermediate the center and ends of the casing, said bames having discharge means around their outer peripheries of a total cross sectional area less than that of said conduit means.

6. In combination in a glass roll, an outer cylindrical casing, a supply tube concentric with the casing and discharging at t-he cen tral portion thereof into the space between the tube and the casing, means for supplying a cooling fluid under pressureto the tube, means for withdrawing the fluid from the ends of the casing, and baffles in the annular space between the casing and tube at points intermediate thecenter and ends of the casing, said bal'esgeach having a series of discharge ports spaced around its outer periphery.

7 In combination in a glass roll, an outer cylindrical casing, a supply tube concentric with the casing and discharging at the central portion thereof into the space between the tuber and the casing, conduit means for supplying a cooling fluid under pressure to the tube, means for withdrawing the fluid from the ends of the casing, andbaliles in the annular space between the casing and tube at points intermediate the center and ends of the casing, said baffles each having a series of discharge ports spaced around its outer peripher the totalcross sectional area of both sets o ports being less than that of said co'nduit aneans.

8.. In. combination in a glass roll, an outer cyhndrical casing, a supply tube concentric with the casing and discharging at the central portion thereof into the space between the tube and the casing, means for supplying a cooling fluid under pressure to the tube, means for withdrawing the fluid from the ends of the casing, and baiiles in the annular space between the casing and tube at points intermediate the center and ends of the casing, each of said battles having a series of discharge notches formed in its outer periphery.

9. In combination in a glass roll, an outer cylindrical casing of greater diameter externally and internally at its central section than at its end sections, a supply tube concentric with tlie casing and discharging at the central portion thereof into the space between the tube and the casing, means for' supplying a cooling fluid under pressure to the tube, means for withdrawing the fluid from the ends of the casing, baflies provided with passages therethrough located between the tube and casing adjacent the ends of said central section of the casing, each of said baiiles being formed of a plurality of plates secured together for relative movement so that the battle maybe reduced in diameter to allow it to be inserted through the end the tube and casing adjacent the ends of' said central section of the casing, each of said bailles being formed of a plurality of plates, hinged together into an annular strip with overlapping ends, so that the baiiie may be reduced in diameter to allow it to be nserted through the end section of the casing, and means for clamping the baiiles in position upon the tube.

In testimony whereof, I have hereunto subscribed my name this 14th day of December, 1926.

HALBERT K. HITCHCOCK.