US1598721A - Fluid-cooled roll - Google Patents

Description

Sept. 7,1926. 1,598,721

H. K. HITCHCOCK FLUID COOLED ROLL Filed Oct. 29, 1923 v 4 Sheets-Sheet 1 INVENTOR Sept. 7 1926.

H. K. 'HITCHCOCK FLUID COOLED ROLL 4 Sheets-Sheet 2 Filed Oct.

Sept. 7 1926.

FLUID COOLED ROLL Filed Oct. 29, 1923 4 Sheets-Sheet .3

INVENTOR mg :2 MN b m M 6 Sept. 7 1926. 7 1,598,721

H. K. HITCHCOCK FLUID COOLED ROLL Filed Oct. 29, 1923 4 Sheets-Sheet 4 INVENTOR Patented Sept. 7, 1926.

UNITED STATES PATENT OFFICE.

HALIBERT K. HITCHCOCK, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO PITTS- BUBGH PLATE GLASS COMPANY. A CORPORATION OF PENNSYLVANIA.

FLUID-COOLED ROLL.

Application filed October 29, 1923. Serial No. 671,376.

The construction is designed as an improvement in glass sheet forming apparatus, such as that shown in the patent to Frederick Eelstharp N 0. 1,560,079, of November 3, 1925, and in general has for its primary object, the provision of, improved means for securing a uniform temperature condition in the sheet which is withdrawn from the tank. In roll structures in which the cooling passages extend in straight lines from one end of the rolls to the other, there is danger of uneven cooling and consequent warping of the rolls, in case one or more of the passages on one side of the'roll should become completely or even partially obstructed. The present invention is designed to overcome this difiiculty, and this is accomplished by directing the cooling passages helically instead of having them extend in straight lines along the roll, the passages being preferably arranged'in sets with an arrangement of inlets and outlets such that a circulation of water in opposite directions is secured through the passages, and so that the amount of water flowing in the two directions is equal, thus incurring uniform cooling of the roll from end to end. The passages are preferably provided in the roll by the use of a core, which is helically grooved, and a casing which isshrunk over the core, but the invention is not limited to this method of providing the passages, as the inventioncontemplates broadly the use of helically arranged passages in fluid cooled rolls. A further object of the invention is the provision of means whereby the degree of cooling of the roll is made automatic and 'uniform throughout. A further object, appli cable in a broad Way'to other sheet glass coolers, in addition to rolls, is the provision of means whereby the greatest cooling effect is applied to the central portion of the sheet, as man tank operations, the body of glass remote from the sides of thetank is hotter then at the sides and in order to equalize the condition and give a sheet of more uniform temperature from edge to edge of the sheet, it is important to provide for the greatest cooling effect where the glass is hottest. Certain embodiments of the invention are illustrated in the accompanying a section through the ends ofv the roll of;

Fig. 4 on a larger scale than Fig. 1. F ig. (3 is a side elevation of the core which fits into the cylindrical casing of the'Fig. 4 construction. Figs; 7 and 8 are end elevations of the roll of Fig. 4. Figs. 9 and 10 are sections on the linesIX-IX and X- X of Fig. 1. Figs. 11, 12 and 13 are detail views of the cage constituting part of the stu box construction at each end of the roll of Fig. apparatus.

Fig. 1 illustrates the application of the rolls to a tank structure 1, such as that shown in the Gelstharp patent heretofore referred to, the glass sheet 1 being withdrawn over a water. cooled platen or table 1 into the roller leer 1 The sheet is withdrawn continuously through the leer where it is annealed and its temperature reduced so that it may be cut in sections as it emerges from the leer.

The roll consists of the cylindrical casing 1, a core made up of the two sections 2 and 3, the end pieces 4, 4 and the swivels 5, 5 and (S, 6 at each end of the roll. The roll is designed to be used in conjunction with another similar roll for providing a pass therebetween. The construction at the two ends of the roll are similar so that a description of the construction at one end only as indicated in Fig. 2 will be suflicient.

Each core section ofthe roll is provided with a helical groove 7, which extendsthe length of" the main portion of the section, each of the sections having at its outer end a portion 8 of reduced diameter with a swivel coupling 6 attached toits outer end. This coupling is connected to the water in let pipe 10 which is provided with a hand valve 11 and the automatically controlled valve 12, later described in detail. The passage 1.3 through thecore section 2 is closed at its inner end by the sheet metal plate 14 which is driven tightly. into place in a manner well known in mechanics, and transverse passages 15 provide communication between the passage 13 and the inner end ofthe groove 7.

Secured to the casing 1 at each of its outer ends is the end member 4 which 1s screw threadedinto the casing as indicated at 16, a copper gasket 17 or other suitable packing means being provided in order to insure against leakage. The roll is supported by means of the arms 18, 18 which. fit around the members 4 and are provided w th the roller bearings 19. The roll is rotated by means of the sleeve 20 keyed to the member 4 and provided with the sprocket teeth 21 which are engaged by a chain driven from power means, not shown.

The swivel 5 comprises the sleeve 22 carrying the gland 23 and the gland 24, the latter gland including the sleeve 25 threaded to the end of the member 4 and the sleeve 26 threaded to the member 22. The chamber 27 in the swivel communicates with the end of the groove 7 by means of the passages 28, and an outlet from the swivel s provided in the form of the pipe 29. Th s pipe leads into a chamber 30 having an out let pipe 31 and also carrying a thermostatic tube 32 filled or partially filled with carbon bisulfide, alcohol or other liquid which vaporizes at a relatively low temperature. The pressure in this tube controls the amount of opening of the inlet valve 33' (Fig. 3) 'in the casing 12. This valve is normally held shut by the spring 34 bearing against the stem on the lower side of the valve, while the upper end of the valve stem is secured to an accordion shaped container 35 communicating with the tube 32 by means of the pipe 36. This device serves to regulate the amount of water flowing through the helical groove 7 so that the temperature of the roll may be controlled and adjusted in order to give the best results. The thermostatic controlling device is applied to the outlet at each end of the roll as indicated in Fig. 1, so that the temperature of the two ends of the roll are independently controlled, which may be desirable it the glass at one side of the roll happens to be at a higher temperature than the glass at the other side. Normally the thermostatic controlling devices will be adjusted so that water of the same temperature is delivered from the two outlet pipes 31. This insures uniform cooling of the roll, even though the cooling passage through one of the rolls may become partially obstructed, as in that case the temperature of the water will increase and the valve 33 will open, thus permitting the greater flow of water through the end of the roll controlled by the valve.

The advantage in the'use of the helical grooves as'compared with straight grooves longitudinally of the roll lies in the fact that, in case of a partial-obstruction in the cooling passage, the roll does not become locally. overheated as is the case where one through the wobbler. The core 38 is comes overheated on one side tending to.

produce a warping of the roll. A further advantage lies in the fact that with the helical groove construction, the unequal cooling of the core 2 in the casing 1 does not cause the roll to warp since the contact between the core and casing is made by the ribs 37, and these ribs are slightly yielding so that the strain imposed upon the core and easing due to unequal expansion and contraction does not throw the same strain upon these parts tending to deform them as would otherwise be the-case, it being understood that the casing is shrunk on to the core so that it grips it tightly and there is no opportunity of relieving this strain due to sliding movement between the core and casing, as would be the case if the casing merely fitted the core snuglywithout grip ping it. Other advantages incident to this i against-unscrewing by means of the pin 43 which extends through the casing and vided with four helical grooves 44, 45, 46 and 47 which terminate at their ends in straight portions having communication with the inlet passages 48 and 49 and the outlet passages 50 and 51 in the swivels. The inlet passage 49 communicates with an annular chamber 52 in the swivel, which in turn communicates with the passages 53 and 54 through the wall of the casing, such passages being positioned so as to communicate at their inner ends with the ends of the grooves 44- and 46. At the other end of the roll the outlet passage 50communicates with the annular passage 55 which in turn communicates with the ends of the grooves 44 and 46 by reason of the passages 56 and 57.. Similarly the inlet* passage 48 com municates with the other two grooves 45 and 47 by reason of the annular chamber and transverse passages through the wall of the roll, and the outlet passage "51 communicates with the other ends of thesesame grooves 45 and 47 by reason of the annular passage 59 and transverse passages between such chamber and the ends of the grooves corresponding to the passages 53 and 54. In order to pack the swivels, the packing 60 and 61 is employed pressed in by the gland 62, the construction being the same at both ends of the roll. The gland is tightened by means of four screws 63 passing through thecollar prothe casing by means of the set screws 65 (Figs. 7 and 8). In order to transmit pressure from-the packing 61 to the packing 60 and at the same time provide for a free flow of water through the annular chamber 52, the skeleton ring or cage 65 shown in Figs. 11 to 13 is employed, such cage being provided with the perforations 66 to permit of a free flow of liquid through its walls. A packing ring 67 isalso employed at the extreme inner end of the swivel. Suitable pipe connections are made to the inlets 48 and 49 and to the outlets 50 and 51, and it follows from the construction as just described, that when fluid under pressure is applied to the inlets, a cooling flow of liquid through the grooves 44, 45, 46 and 47 is secured, the grooves 44 and 46 carrying the liquid to the left, while the grooves and 47 carry the liquid to the right. In this way the alternate grooves carr liquid flowing in opposite directions, so t at uniformity in cooling the roll is secured, such as would not be the case if the liquid passed through all four grooves in the same direction. In this construction, as in the first one described the casing is shrunk upon the core, but in order to still further insure against relative movement, the pin-68 is employed extending through the core and the walls of the casing.

The left hand end of the grooves 44, 45, 46

and 47 which extend to the end of the roll, are closed by means of the metal packing ring 69 pressed inwardly by the cup shaped gland 70 and by the packing rings 71. The

gland 7 C is held in position by means of the stud bolt 72 threaded into the reduced end 73 of the roll. As in the other type of construction, it is preferred to regulate the outgoing water from the outlets and 51 by' means of the thermostatic regulating devices, such devices not being shown, however, in connection with this construction of Figs. 4 and 5,. In this construction four helical grooves are illustrated, butit will be understood that agreater or less number may be employed.

lVhat I claim is:

1. The combination with a glass tank having means for withdrawing a rihbonor sheet of glass therefrom continuously, of cooling or chillingnmeans comprising a metal memberrextending transversely of the sheet, adjacent the point of withdrawal, and means for discharging a cooling fluid into the member at its central portion, circulating it outward totheend portions of themember, and withdrawing it at said end portions.

, 2. The combination with a glass tank having a withdrawing opening for the passage of a sheet or ribbon of glass continuously 'therethrough, of a metal roll extending ends of the rolls, and withdrawing it at said p ends.

4. In combination with a glass melting tank having an outlet, of a metal roll adjacent thereto'having a pair of helical passages, each of which has its origin at one end adjacent the center of the roll and at its other end terminates at the end of the roll, and means for circulating a cooling fluid in opposite directions through the passages.

,5. In combination with a glass melting tank having an outlet, of a metal roll adjacent thereto comprising an outer cylindrical casing, a core adapted to fit in such casing and provided with helical grooves extending longitudinally thereof, each of which has its origin at one end adjacent the center of the roll-and at its other end terminates at the end of the roll, and means for circulating a cooling fluid in opposite directions through the passages.

6. In combination with a glass meltin tank having an outlet, of a metal roll adjacent thereto comprising an outer cylindrical casing, a core adapted to fit in such casing and provided with helical grooves extending longitudinally thereof, each of which has its origin at one end adjacent the center of the roll and at its other end terminates at the end of the roll, and connections at the ends of the casing whereby cooling fluid may be circulated through said HALB'ERT K. HITCHCOCK,

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