Патент USA US2116980код для вставки
May 10, 1938. 2,116,980 F. H. NAISH AUTOMATIC SCRAPER FOR STRIP METAL STOCK" . Filed June 28, 1937 2 Sheets-Sheet l INVENTOR FREUD H NAIJH À May 10, 1938. F. H. N_AlsH 2,116,980 AUTOMATIC SCRAPER FOR STRIP METAL STOCK Filed June 28,Y l1957' 2 sheets-shew; INVENTOR FRED H NAISH Patented May 10,- 1938 ` i 2,116,980 PATENT ori-*ica N UNITED ¿STATES . s analist i . l „ \ AUToMAnc~scaAran Foa simu» METAL srocx “ « ‘ ma' awash, Birmingham. man „signor u» ` Connors ware Steel Company, a corporation of " Application as, 1931, serai »16.150.141 comme." wl. so-ii ‘ i My invention `relates to an lautomatic >scraper ‘ for mills rolling strip stock. ‘ l l More particularly my invention is `applicable Fig. lois an end‘view of atypical strip rolling Í` mill showing Vmy improved automatic scraper . control ,associated .with the mill power circuits laid out in a conventional diagram'. to mills of the class suitedv for the rolling of narrow strip stock; s'uch ashoopstock, in `which _ l the strip travels at a high speed‘in` its traverse of the finishing‘mill pass. " s . ` The object of my invention is `to reduce to a 10 Fig..2 is a‘plan viewof the` mill and scraper mechanism. . . s ‘ ‘ ` sectional view ‘showing `the . Fig. 3 is a cross scraper elements in operative position. minimum the amount of ‘ilnished 4,stock in` each Fig. 4 is a diagrammatic circuit layout for a `ing rolls'at a speed equal to, or even in excess `In the ‘embodiment of my invention illustrated, piece rolled which gets by the scraper untreated load relay suitablelfor the control of the scraper. 10 ‘s s numerals refer to similar and is therefore unmarketable. It is customaryl . ` .Similar reference -for hoop strip stock to travel through the iinish s parts throughout the drawings. `; of, 1500 feet per minute,`or 25 or more feet per .I show a typical mill roll _stand `comprising a “ second. At such speeds it `will‘be obvious that . housing 5, the usual‘bearlngs 6 and‘l‘wfor the 15 whatever time interval is permitted to `elapse ‘be-.s ` upper and lowerrolls 8 and 9, and adjusting tween the moment that the Vmill rolls grip the` screwsl I0 >to set `the upper roll bearingsso as to forward end of a strip of stockand the setting produce the `desired roll clearance. „ Suitable ` ‘of the scrapers to engage the stock, will repre- y "guides Il receive the incoming stock and de sent a loss. ‘Where it is attempted toset the Í liver it_ into the mill pass,.while corresponding 20 scraper by hand or stock actuated switch,; the ¿ guidesv `lilcarry the iinished stock away fromV the l delay of _a fraction `of a second,` in >setting the s to scraper may mean many feet of untreated stock ` . I mount ` i fast on the housing 5, adjacent i `that must be scraped, while iffthe _scraper is ` the stock guides . il, a stationary Ascraper frame set in advanceof ‘the stock’s engagement be-` ì I3 comprising the spaced "scraper bars lil, I5 25 tween the‘rolls, the feed of stock will beï‘stópped, and I6. A‘sverticallymovable.scraper frame I1 i ‘necessitating release‘of the scraper andcausing ‘carries scraper bars i8 and I9 `wlilchdepend be rolls. 30 s s i y i s. \ ' low it and in their lowered operating position ñt delay in operation and reduction oi output. between and coact with, bars Il, l5 _and `I6 to `The purpose of my present invention is-auto matically to-apply the scraper cotemporaneously `bend the stock and effectively scrape it on both 30 with the engagement of the'forward end ‘of` the ksides,i i asl will ` appeari in" Fig.` 3. A frame 20, strip stock between the mill rolls. `To' this end " also attached to thehousing 5, supports an up the'scraper is set lclose as it conveniently‘may right cylinder 2l centrally' over the bar IL The be to the mill rolls on their receiving side fand ‘ movable frame I1 has end guide extensions which electro-magnetically controlled means are em `slide 'in the grooves 22 formed "in the vertical ployed to set the scraper to its work responsive sides of the frame 20. The cylinder has its pls-` 35 to the increase of load coming on the mill when i ton connected centrally to the frame` i3 on its it grips the stock. In other words, the increase `mili side and it is adapted to be operated by com- l of power required'to drive the rolls when they` pressed ,air supplied 4from lany suitable source, take hold of the strip will act automatically and such as the tank 23 from `whence'itilows through .40. instantaneously to apply the scraper so that the pipe 24 to‘a four-way valve 25 controllingits unscraped waste stock on each piece rolled is ñow to, and 4exhaust from, th'e‘ cylinder. This `substantially limited in length to the distance be `‘valve may be ‘of’ any standard >four-way type . tween the scraper and its associated'mill pass. ~ ‘andas it` formsno particular part of4 my present . The discharge of the stock piece'from" the rolls H inventiomit will not be illustrated in detail. 45 l The valve body‘has an exhaust outlet 26 and will likewise effect anautomatic resetting of the scraper to open position so as to permit the im air lines 21 and 28 leading ‘tothe opposite ends ` `of `the cylinder 22; 'I'he valve element in the `My invention iurthercomprises the novel de `form shown is controlled by a lreciprocable tails of construction and arrangements of parts plunger 29` connected. to a lever A30 pivoted at 50 which, intheir preferred embodiment only. are one end to the bracket 3l and at its other end mediate rfeed of new stock into the mill.` l illustrated in the accompanying drawings with . connected t_o_ the core 32 of the solenoid 33. As shown, fthe core passes loosely through the reference to which my invention is `more par free end of the lever 30 and carries at-its‘ lower ticularly described and claimed.` ` ` ‘ " ‘i end a spring seat 34 upon which rests a coiled According to the drawings:--" 55 2 2,116,980 compression spring 36 that supports the lever 30. 'I‘he lever 30 is connected by a coil tension spring 36 to a bracket 31 on the valve body and thus the free end of the lever is biased against spring 35. Assuming -the deenergized, the parts .will occupy shown in Fig. 1 with the pressure downwardly solenoid 33 the position admitted to the lower end of the cylinder through'fair- line 31, and the upper end of the cylinder open to and 46 are connected. Thus a current fiow greater than that required to drive the mill when idling will instantly lift the switch arm 55 and close the valve control secondary circuit ener gizing the solenoid 33 and causing the air motor, assisted by gravity, to thrust the movable scraper frame I1 into quick engagement with the stock. In like manner, the moment the mill rolls release the stock, the load factor on the primary circuit drops, the plunger 53 is'lowered, the switch 55 is 10 opened and the secondary circuit is broken, the exhaust through air line 28 and valve outlet 26. The scraper will be in open position and the mill rolls will be turning idle, as indicated -by the 1 whereupon spring 36 resets the -valve to the posi arrows, ready for the reception of the strip stock tion shown in Fig. 1 and the air pressure lifts to be rolled. 15 the scraper frame I1 so that the new stock is The electric motor for driving the mill rolls is ` ready to be introduced into the mill. omitted but a metering power circuit 40, 4| therefor is shown comprising anammeter 42, a voltV meter 43, and a current load relay 44. This load relay, in the manner well understood in this art, acts to open and close a 110 volt valve control circuit comprising the leads 45 and 46, which include the solenoid 33 and also the double safety switch 41 and the hand operated control switch 48. 'I'he load relay -is of' such 25 character that the solenoid circuit is open when the mill is idling but the moment the stock enters the pass between the mill rolls more power will be required in the primary or load responsive cir cuit 40, 4I and such increased flow of current 30 will operate the load relay to close the secondary or valve control circuit 45, l46 energizing the solenoid 33, lifting the solenoid core 32 and rais ing the valve lever 30, against the action of spring 36, to reverse the four-way valve 25 and admit 35 air through the line 26 into the upper end of the cylinder 22 while exhausting air from the lower end of the cylinder through the line 21 and the `valve outlet-26.' The combined action of air and gravity will thrust the movable~ scraper element 40 I1 quickly downward into its operating position, shown in Fig. 3, and will hold it in this position with its scraper >bars interleafed between the blades of the stationary scraper' bars so as to effectively scrape and clean the stock passing to 4`5‘ the mill pass. As soon as the stock leaves the ‘ mill rolls the current load factor in the primary current will drop, causing the load relay to open the secondary or valve control circuit, whereupon the solenoid will be deenergized, and the spring 50 36 will reverse the four-way valve 25 to admit air below the piston in cylinder 22 and exhaust air from above the piston, so that the movable scraper blade I1 is lifted to open the scraper and allow the next stock to pass freely to the entering mill 55 guides Il. - The switches 41 and 45 are normally closed when the apparatus is in operation and are not open as shown in Fig. 1. The switch 48, a man ually controlled switch of any suitable and con venient type, is arranged so that the operator can at will open the valve controlling circuit. Thus, when the mill is starting up and the load factor willbe high, it is necessary to hold switch 46 open until the millattains idling speed, then it can be closed and the current relay 44 will thereafter 25 automatically control it. Likewise, if anything goes wrong during the rolling operation, the strip-‘ per can be immediately disengaged from the stock by opening switch 46. Switch 41 is purely a safety switch. 30 While I have shown my invention in. but one form, it will’ be' obvious to those skilled in the art that it is not so limited, but is susceptible to var ious changes and modifications, without depart ing from the spirit thereof, and I desire, there fore, that only such limitations shall be placed thereupon as areimposed by the prior art or as are specliically set forth in the appended claims. ` What I claim as new and desire to secure by Letters Patent, is: 1. The combination with a mill for rolling strip stock of an automatic scraper mounted adjacent to and on the receiving side of the mill,.an elec trical power circuit for the mill drive comprising a load relay, a secondary circuit controlled by 45 said load relay responsive to the presence or ab sence of stock between the mill rolls, an electro magnetically controlled valve means _responsive . to said secondary circuit, and fluid pressure means controlled by said valve means and adapted to apply the scraper to strip stock entering the mill pass and to set the scraper for admission of fresh stock to the mill, and a load relay in the mill ‘ drive circuit adapted to control the secondary ' circuit and set the scraper in operating position In Fig. 4 I have shown a conventional wiring as soon as the stock enters, and during its trav diagram for the current load relay 44 as this erse of, the mill roll pass'. may be of standard design which in various types 60 is available on the market. As illustrated in' Fig. 4, the primary‘circuit leads 40 and 4| are respectively connected to the terminals 50 and 5| of therelay, these terminals being in turn connected to the ends of a circuit 52 which includes coils 'surrounding a plunger 53. 65 the coils having tap leads to a connector block 54. so that the desired .tap values can be obtained for setting the plunger to operate at the desired predetermined load value. This load value is 70 such'as will result when the mill rolls bite into the stock; and under such conditions the increased ilow of current will lift the plunger and operate the switch arm 55 to close the circuit 56, the sides of' which are connected to the terminals 51 and 58, 75 to which respectively the control circuit leads 45 2. 'I‘he combination with a mill for rolling strip stock, a scraper mounted close to the receiving `side of the mill and comprising cooperating sta 60 tionary and movable elements, a ñuid pressure motor to open and close the scraper elements, a control valve for said motor, electro-magnetic means to _operate said valve to reverse said motor.. an electric supply circuit for the mill drive, a load relay responsive to the circuit flow insaid circuit, and a secondary circuit including said electro-magnetic means and controlled by said load relay to reverse said motor when stock enters and leaves the pass between the mill rolls. 70 3. A scraper means for a rolling mill. according to claim 1, in which the electro-magnetically con trolled valve means comprises a valve operating lever, spring means normally holding the lever in position to render the scraper inoperative, and 75 3 2,116,980 a solenoid adapted to move the lever and valve against said spring to set the scraper in operative engagement with the stock. 4. A scraper means for a rolling mill, according to claim 2, in which the secondary circuit comprises a manually controlled switch operable to open and close the scraper elements independ ently of the operation of said load relay.` 5. The combination with a rolling mill having 10 an electrical power` circuitI carrying `current for the drive of the mill rolls, a `scraper means adapt ed to act on the stock in its passage to the `mill 6. The combination with a rolling mill having an electrical power circuit carrying current for the drive of the mill rolls, a scraper adapted to act on the stock in its passage to the mill, an electro-magnetically controlled means, auto matically responsive to an abnormal current flow in the mill power circuit responsive to the engage ment of stock between the mill rolls, to cause the scraper to engage the stock as soon as it is grasped by the rolling mill, said means comprising a relay responsive to the current flow in the mill drive power circuit, a relay operated switch means oper and comprising separable‘elements operable to able responsive to a predetermined current ilow engage and release the stock, electro-magnetically in said circuit, a secondary circuit controlled by 15 said switch and comprising an electro-magneti 15 controlled means to effect the engagement `and disengagement of said scraper elements, andv cally operated valve, and a ñuid power motor con means, automatically responsive to an` abnormal trolled by `said valve and adapted according to its current flowin the mill power circuit responsive setting to cause the scraper to engage or release to the engagement of stock between the mill rolls. for effecting automatically engagement of the scraper elements with the stock as soon as it is grasped by the rolling mill rolls. the stock. , FRED ' H. NAISH.