US3299900A

US3299900A - Strip cooling system

Info

Publication number: US3299900A
Application number: US442679A
Authority: US
Inventors: Morris D Stone; Clark H Johnson
Original assignee: United Engineering and Foundry Co
Current assignee: United Engineering and Foundry Co
Priority date: 1965-03-25
Filing date: 1965-03-25
Publication date: 1967-01-24
Anticipated expiration: 1984-01-24
Also published as: GB1131692A; FR1471836A

Description

Jan. 124;, 17967" M D. STONE ET AL STRIP COOLING SYSTEM 2 Sheets-Sheet 1 Filed March 25, 1965 INVENTORS.

MOAW/S 0. 570M? CZAAK H. JOHNSON I Q V 24,141

A TTOR/VEK Jan. 24, 1967 M STONE ETAL STRIP COOLING SYSTEM Filed March 25, 1965 2 Sheets-Sheet 2 INVENTORS. MORRIS D. STONE CLARK f1. JOHNSON BY 7 ATTOP/V'V.

United States Patent 3,299,900 STRIP COOLING SYSTEM Morris D. Stone and Clark H. Johnson, Pittsburgh, Pa.,

assignors to United Engineering and Foundry Company, Pittsburgh, Pa., a corporation of Pennsylvania Filed Mar. 25, 1965, Ser. No. 442,679

2 Claims. (Cl. 134-122) This invention relates to a liquid-diverting apparatus for use with a cooling system for hot workpieces, such as, strip, plate and the like and, more particularly, to such apparatus employed to divert quickly coolant delivered by a cooling system wherein it is not possible, at least practically, to instantaneously commence or discontinue the flow of the coolant onto the workpiece.

A cooling system that does not permit the instantaneous commencing or interruption of the coolant, such as, water, is disclosed in US. Patent No. 3,025,865 which issued on March 20, 1962 in the name of J. N. Adcock, entitled Apparatus for Cooling Hot Metal Strip or Plate by Laminar Liquid Flow. Since the device illustrated in this patent operates on a siphon principle, it requires the maintenance of a certain depth of water in order to establish the siphon action. This, of course, not only requires a certain period of lost time to obtain the required depth of water; but the water continues to flow after it is necessary until the water level is lowered to where the siphon action is interrupted.

The present invention provides a diverting apparatus for selectively and quickly controlling the delivery of the coolant onto a workpiece, particularly when the coolant is delivered by a device that requires lost time in either being able to commence the flow or interrupt the flow of coolant onto a workpiece.

The limitation noted above becomes important in at least two respects:

"One, it prevents the operator from being able to control the application of the coolant on the workpiece as the temperature needs thereof rapidly vary.

For example, if the leading portion of the strip is hot enough to require the application of maximum cooling, whereas the trailing portion requires little or no cooling, if the cooling system is not capable of almost instantaneous oif-on control, the proper'workpece temperature cannot be realized. This limitation becomesquite serious in mill s where the'speed of the strip is first maintained at a low level, say,'of the orderof 2000 f.p.m. which enables the strip to be fed to the 'coilers, after which the speed of the strip is raised in second to a level of approximately 3500 f.p.m., which speed is employed to obtain maximum productivity. It is important to realize in this connection that at the higher speed of the mill, as much as 50% more coolant may be required.

Two, it represents a significant waste of water which adds to the expense of the product. The cost of processing water in a modern strip mill is more and more becoming an important economic factor.

It is a further object of the present invention to provide a coolant-diverting apparatus for quickly and selectively controlling coolant delivered from a plurality of devices that operate on a siphon principle, a pressure principle or the like and, more particularly, wherein the flow of the coolant with respect to the strip may be commenced and discontinued almost instantaneously.

According to one form of the present invention, there is provided an apparatus to selectively and instantaneously divert liquid coolant discharged from a siphon coolant system or the like employed for cooling workpieces being conveyed thereunder, comprising a coolant container arranged at a spaced superimposed distance from the workpieces to be cooled, said container having associated therewith a discrete input coolant means and a discrete output 3,299,900 Patented Jan. 24, 1967 I coolant means for discharging coolant from said conbearing block assemblies 12.

tainer onto workpieces, coolant-diverting means selectively positionable between the discharge portion of said container and the workpieces, power means connected to said diverting means for positioning said diverting means into and out of a coolant-diverting position, whereby the delivery of coolant onto said workpiece or its interruption in instantaneously controlled.

These objects, as well as other features and advantages of the invention, will become apparent when the following description is read in conjunction with the accompanying drawings of which:

FIGURE 1 is an elevational view of a diverter employed in conjunction with a hot strip coolant device, and

FIGURE 2 is an elevational view' taken along lines IIII of FIGURE 1. 7

With reference to the drawings, there is illustrated in FIGURE 1 one of the rollers 11 that makes up a hot runout table employed for conveying a hot metallic strip S. The roller 11 is supported at each end by anti-friction These assemblies are mounted on a structural support 13 that is secured to the foundation in a usual manner. The roller 11 is connected to an electrical rnotor 14 mounted at one side of the table. Conventional

strip side guards

15 and 16, shown in phantom, are arranged at the outer ends of the roller to prevent the strip from accidentally traveling off the roller.

A vertical support beam 17 is mounted on the foundation at the motor side of the roller 11. Pivotally connected by a pin 18 to the top of this beam is a fabricated water box 19 which includes a bottom plate 21. It will be appreciated in referring to FIGURE 2 that is a plurality of water boxes 19 are provided, being arranged in a sideby-side relationship along the roller table. Since the boxes are similarly constructed, reference will only be made to one of them. The water box is provided with

vertical baffle plates

22 and 23 which form a water reservoir 24 that extends the full length of the water box 19. A water input pipe 20 (shown only in FIGURE 1) supplies water to this reservoir. Passing through each of the

baflie plates

22 and 23 are a plurality of inverted U shaped

pipes

25, 26, 27 and 28. with respect to each of these pipes that their lower ends, located in the reservoir 24', are slightly raised above the bottom plate 21. The other ends of the pipes pass through the plate 21 for discharging water from the resevoir. It is to be appreciated that water is discharged from the

pipes

25,26, 27 and 28 as a result of the siphoning action established by raising the water level in the reservoir above the U shaped bend in the pipes.

With particular reference now to FIGURE 2 and to the diverter apparatus, there are provided a plurality of elongated U shaped coolant-diverting pans 36 longitudinally arranged at the underside of the plates 21 for operative communication with the discharge ends of the U shaped pipes. These pans are enclosed at one end by end platen 36a and open at the other end so that coolant can pass from the diverter pan into a suitable drain, not shown in the drawings. Each diverter is secured to an elongated shaft 37 which is rotatably received at each end by mounting blocks 38 and 39 that are secured to the plate 21. A lever arm 41 is affixed to the outboard end of shaft 37 adjacent the block 38. This lever arm is connected to the rod end of a piston cylinder assembly 42 which is mounted on the outer vertical surface of the water box 19. It will be noted, by referring to FIGURE 2, that each diverter pan 36 is positioned so as to communicate with and receive coolant discharged from the

pipes

27 and 28 of one water box and pipes 25 and 26 of the succeeding water box.

It will be noted- In the event it is desired to clear the area above the strip S, such as may be required for maintenance or to remove a cobbled strip from the table, there is provided a piston cylinder assembly 29, shown only in FIGURE I, mounted on the support beam 17 and having its rod end connected to an arm 31 which is, in turn, connected to the plate 21. A counterbalance 32 also is secured to the plate 21 to balance the overhung weight of the water box assembly. A combination stop and leveling adjustment is provided to assure that each water box is level and the water level will not vary along the length of each box. This level adjustment consists of a threaded bolt 33 received in a plate 34 which is connected to an upright beam 35 secured to the foundation. Operation of the piston cylinder 29 will pivot the water box 19 about the pin 18 to a position where it will not obstruct access to the roller which'is shown in FIGURE 1 by dot and dash lines.

A brief description of the operation of the invention will now be given. The above-described water discharge device is initially placed in operation preparatory to actual strip cooling. This is accomplished, as heretofore mentioned, by raising the water level in the reservoir 24 slightly above the U shaped bend in the siphon pipes. When this occurs, a siphon action is established in the pipes which discharge the water from the reservoir through the bottom plate 21. As the water emerges from the delivery end of each pipe, it will either fall into the diverter pans or into the strip. Should the water pass directly into the diverter pans 36, it will be collected and directed to the motor side of the roller table and pass into a suitable drain, which may be connected to the coolant water supply tank, not shown in the drawings. At this point it will be noted, however that the siphon action in the water boxes 19 has been established. Consequently, when it is desired to apply the water coolant onto the strip S which is conveyed by the rollers 11, the piston'cylinder assemblies 42 are operated to quickly rotate the diverter pans 36 about the shafts 37 to a position shown by phantom lines in FIGURE 2. This instantaneously allows the coolant water to fall onto the strip.

The present invention also provides a quickly responsive strip coolant control such as may be employed during the acceleration of the strip where the number of cooling devices is quickly and sequentially increased for maintaining uniform strip temperature. In this respect the number of coolant devices employed may be quickly increased by exerting the desired control over the operation of the piston cylinder assemblies 42, to position the diverting pans 36 into the desired position Thus, the pres ent invention not only provides a quickly responsive coolant control, but also a dependable and predictable control.

According to the provisions of the patent statutes, we have explained the principle and operation of our invention and have illustrated and described what we consider to represent thebest embodiment thereof. However, we

desire to have it understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically illustrated and described.

We claim:

1. An apparatus for controlling the application of coolant onto a passing workpiece by diverting its direction of flow, comprising:

coolant discharge means positioned at a spaced distance from the workpiece for delivering coolant onto the workpiece,

coolant supply means for deliverying coolant to said discharge means,

a U shaped coolant diverter pan selectively positionable intermediate said discharge means and the workpiece and adjacent to said discharge means for diverting coolant delivered from said discharge means so as not to allow the coolant to contact the workpiece,

said coolant diverter pan having its open side arranged to receive coolant from said discharge means and having one of its ends closed so as not to allow coolant to escape from the closed end thereof, and

power means connected to said coolant diverting pan for quickly positioning said diverter pan in a first position in which coolant delivered from said discharge means will flow into said diverter pan, and in a second position in which the coolant delivered from said coolant discharge means will flow onto said workpiece.

2. An apparatus according to claim 1 wherein said coolant discharge means includes,

a plurality of coolant reservoirs arranged in a side-byside relationship and transversely positioned above a workpiece,

said reservoirs containing a plurality of U shaped coolant delivery pipes, each having coolant receiving ends positioned in said reservoirs and coolant discharge ends for delivering coolant from said reservoir onto a workpiece,

said coolant diverter pan being pivotally secured to said coolant discharge means and arranged to communicate with the discharge ends of said delivery pipes, and

said power means including a piston cylinder assembly operatively connected to said diverter pan.

References Cited by the Examiner UNITED STATES PATENTS 1,916,269 7/1933 Kin'gsbury 134-72 2,633,992 4/1953 Hock 13472 X 3,025,865 3/1962 Adcock 134-422 3,224,914 12/1965 Benton et al. 134-183 X CHARLES A. WILLMUTH, Primary Examiner.

R. L. BLEUTGE, Assistant Examiner,

Claims

1. AN APPARATUS FOR CONTROLLING THE APPLICATION OF COOLANT ONTO A PASSING WORKPIECE BY DIVERTING ITS DIRECTION OF FLOW, COMPRISING: COOLANT DISCHARGE MEANS POSITIONED AT A SPACED DISTANCE FROM THE WORKPIECE FOR DELIVERING COOLANT ONTO THE WORKPIECE, COOLANT SUPPLY MEANS FOR DELIVERING COOLANT TO SAID DISCHARGE MEANS, A U SHAPED COOLANT DIVERTER PAN SELECTIVELY POSITIONABLE INTERMEDIATE SAID DISCHARGE MEANS AND THE WORKPIECE AND ADJACENT TO SAID DISCHARGE MEANS FOR DIVERTING COOLANT DELIVERED FROM SAID DISCHARGE MEANS SO AS NOT TO ALLOW THE COOLANT TO CONTACT THE WORKPIECE, SAID COOLANT DIVERTER PAN HAVING ITS OPEN SIDE ARRANGED TO RECEIVE COOLANT FROM SAID DISCHARGE MEANS AND HAVING ONE OF ITS ENDS CLOSED SO AS NOT TO ALLOW COOLANT TO ESCAPE FROM THE CLOSED END THEREOF, AND POWER MEANS CONNECTED TO SAID COOLANT DIVERTING PAN FOR QUICKLY POSITIONING SAID DIVERTER PAN IN A FIRST POSITION IN WHICH COOLANT DELIVERED FROM SAID DISCHARGE MEANS WILL FLOW INTO SAID DIVERTER PAN, AND IN A SECOND POSITION IN WHICH THE COOLANT DELIVERED FROM SAID COOLANT DISCHARGE MEANS WILL FLOW ONTO SAID WORKPIECE.