De.; 3, 1946. , c. M. DoYLE 2,412,133 DRIER Filed Nov. 5, 1942 . ,.1.l .«|flrl I 2 sheets-sheet 1 Dec. 3, 1946. C. M'. DOYLE 2,412,133 DHIER Filed Nov. 5, 1942 2 Sheets-Sheet 2 gmc/»hw COLLIN M. DUYLE Patented Dec. 3, 1946- 2,412,133 ' UNITED STATES PATENT OFFICE 2,412,133 ' conm M. Boyle, salem, omo, mimo»- to 'rhs Salem Engineering Company, Salem, Ohio Appucauun 'November s, 1942, serial No. 464,558 3 Claims. (ci. zes-a2) 1 2 , This invention relates to drying apparatus and the parts through the units of the complete proc more particularly to a unitary, portable, self-con-essing line. Also the present apparatus is so de tained assembly which is operative to dry small - vised that an additional dryingdrum may be pieces such as small metal parts. readily attached to increase the length of the The primary object of the invention is the pro- '4 drying chamber which is ydesirable in certain sit vision of a highly ef?cient apparatus of the char uations. acter stated which is simple in design, compact The above and other objects and advantages'oi and economical in construction, which may be the invention will become apparent upon a con completely assembled at the factory, and which sideration of the following detailed speciñcation may be readily moved about the parts manufac and the accompanying drawings wherein there is turing or processing plant as needs dictate. To specifically disclosed a preferred practical em this end all the operative parts of the apparatus bodiment of the invention. _ are assembled on a unitary frame of minimum dimensions whereby the floor space required for the installation of the apparatus is materially less than in comparable devices heretofore pro posed for performing the same functions. The frame is carried on skids and the major part of the necessary apparatus constituting the 'assem bly is positioned in an out of the way location above the drying chamber. » A more specific object of the invention is the provision, in an apparatus of the character de scribed, of an improved arrangement for gener ating the heat required to efiect a rapid dry ing of the parts and for injecting the heat thus generated into the drying chamber. These im provements enable the complete apparatus to be materially simplified and compacted and reduces heat loss to a minimum whereby a greater etil ciency of operation may be attained. Another object of the invention is the provi sion, in apparatus of the character described, of In the drawings: . Figure 1 is a side view, partly in section, of an assembled drier constructed in accordance with the principles of the invention; Figure 2 is a transverse section, with certain parts. omitted, taken generally along the line Il-H of Figure 1; ' Figure 3 is 'an end view of the apparatus oi' Figure 1; and Figure 4 Vis a fragmentary side view'taken from the position IV-IV (Figure 2). Referring to the drawings,lreference numeral In designates a cylindrical drum having a helical material moving baiiie or baiiies II positioned against the inner surface of Vits side wall. One end of the drum I0 is funnelled at I2 to provide an inlet for the pieces or parts to be dried and 30 it will be understood that upon rotation of the drum I0 the parts entering at I2 will be caused to move longitudinally along the drum and be discharged at the end I3. The parts, of course, a practical arrangement whereby a material re will remain in the bottom of the drum and will cuperative eiîect is attained without sacrificing 35 be tumbled about to a certain extent as they pro the eiliciency or speed of drying. . gress through the drum. This turning move- ' A further object of the invention is the provi ment is of material aid in hastening the drying sion of a unitary and self-contained small parts process. drier which may be readily coupled directly with « Adjacent the end I3 of the drum III is a wear other- equipment utilized in the particular process 40 band I4 which is arranged to be engaged by roll involved whereby the carrying out of the process ers l5 journaled in a cradle I6 which, in turn, or processes in a more continuous and economical manner may be effected. For this purpose the is pivotally mounted on a support I1 by means of a pivot pinA I1' A ring I8 is ilxed to the opposite end of the drum and pressed onto the ring I8 is ployed i-s` so constructed and positioned in the a combined supporting and driving gear I9. As assembly that it may be directly and mechan lshown in Figure 1, the outer smooth races of the ically coupled’with the revolving drums of pre member I! are engagedby the flanged rollers ceding equipment. This preceding equipment 20 while the teeth of the gear are engaged by a - may, for example,` consist of a combined pickling spur gear 2| which, in turn, is driven by a pinion and washing unit utilizing one or more perfo 50 22 fixed to the shaft of a geared motor 23. It rated drums at each stage. In this case the last will be understood that at least two circum washing or drying drum would be connected with ferentially spaced sets of rollers 20 will `be em the drying drum of the present apparatus and all ployed to lend lateral stability to the drum. 'I‘he the moving parts would rotate in unison to pro-l rollers 20 as well as the- gear 2|, motor 2l and vide for the uniform and uninterrupted ilow of 55 supports I1 are mounted lon abase consisting of revolving drying v and conveying chamber em 2,412,138 3 . 4 ' the spaced iongitudinauy extending skids u and an auxiliary source of drying air is provided by the transverse angle sections 26 and 26.' Extending upwardly from and rigidly secured to each of the skids 24 are two longitudinally ` one or more slide valves 63' located in the wall of the chamber 40 adjacent the llame end oi the burner 42. The air inlet to the blower 46fis provided by a chamber 64 from which extends a large conduit 66 leading from the space about the drum I0 and within the chamber „formed by the walls 32 and 33 as indicated in ' spaced frame section members 21 which are inter connected at `their upper ends with transverse and longitudinal members 26 and 26, respectively, to provide a box-like frame structure for the sup# ’Figures 2 and 4. To insure that an ade port of the parts to be described below. As shown in the drawing, ,suitable gusset plates are fastened 10 quate supply of air is always delivered by the into the corners of the frame to provide the proper , blower 46 a slide valve 66 may be provided in the strength and rigidity. conduit 56 to take in as much outside air as , . may be required. In operation, with the blower 43 furnishing a ' and al which' are welded or otherwise suitably secured to the stanchions 21 is a casing having 15 supply of air under pressure to the conduits 62 end walls 32 apertured to receive the drum III` » and 46, if the burner 42 isnow lit combustion will take place in the chamber 4I!` and the volume of and concentrically spaced side walls 33 and 34. the hot gaseous products of combustion will be The space between the walls 33 and y34 is fllled Aaugn'iented by the air taken in through the valve . with suitable insulating material 36 -such as min Supported on the semi-cylindrical hangers 30 eral wool, for example. l 20 or valves 63’. Projecting into the end I3 of the drum'lll and extending along the axis oi' rotation of the drum for substantially the entire length of the drum is‘ a pipe 36 which, as shown in Figure l, is closed of! at its inner end 31. In the par 25 ticular apparatus chosen for illustration the lower . The hot gases and air. thus pro vided will be withdrawn from the chamber 46`by the decrease in pressure created in the chamber by the ilow of the air stream from the nozzle 63 through the restricted passage 60 as will be well understood. The gas and air from chamber 46 will be mixed with the air issuing from the nozzle 63 and this mixture will be forced into the pipe 36 through the conduit 6I. Assuming the motor portion of the pipe 36 is provided with live air discharge openings 38 which are positioned »to 23 to be in rotation, as the parts or other oblects ‘ one side of the vertical plane passing through the central axis of the pipe. ’I‘his is the side on 30 to be dried are charged through the end I2 the same will fall into the space convolutions be which the parts being dried tend to accumulate tween the baiiles Il and be moved longitudinally upon rotation of the drum in the direction in through the drum directly opposite the air dis dicated. The openings 36 which are closer to the charge openings 33. At the lsame time the ribs inlet I2 of the drum I0 are closerv to this plane than are the discharge openings which are fur-L 35 33 will operate to rotate or tumble the objects or ther removed. parts thus further increasing the'speed of the v Secured to or formed in the inner surface of the cylindrical wall of the drum I_Il_ are a plurality oi circumferentlally spaced tumbler ribs V36, the l L drying process.’ It will be understood that the drying gas and air after having been blown over the wet parts function of which is to increase the extent >oi 40 will become heavily laden with moisture and, this being the case, this iluid is then allowed to 'es- l the drier as will bel understood. To assist the ' cape out both- ends of the drying drum. . How. turning movement of the parts passing through drum in discharging the parts theribs'. are prefer ably omitted in the last space convolution ad jacent the discharge end I3 of the drum. Supported on top> of the frame provided by the ever. it is obvious that a substantial amount of, heat will be imparted to the drum, particularly by reason oi the character of construction of the . ` . drum, and in accordance with the present inven members 21-26 is a combustion chamber‘or re tion this heat is reclaimed by exhausting the air tort 40 preferablyk having a sheet metal shell and a refractory lining 4I. A burner 42 is posi-` from the space immediately surrounding the mixer 43, the details of which are unimportant in the present invention. Gaseous fuel is ‘sup plied to the mixer and burner through the conduit will be noted that the sidewall of the drum I6 is impervious to the ilow oi gas or air so that none drum into the blower 46. This is the function tioned in the retort 40 at one end thereof and con 50 of the conduit 66 and the recuperation is further enhanced by the insulation provided at'36. vIt necting with the burner is a gas-air aspirator 44 by a valve 46 therein which may be either man ually or automatically controlled and primary air for combustion is furnished by conduit 46 having a -valve 41 therein `'which may likewise be either ' manually or automatically controlled. ' Drying air aswell as primary -air for combus tion is furnished by a blower 48 driven by the motor 49 which are also mounted on top of the o! the moisture laden iluid is drawn into the Air is taken into the space between the drum III and wall 33 through the necessary clearances between the drum and the end walls 32. Thus the air is caused to move -in wiping contact with the outer surface o! the drum Ill 55 blower 46. 00 thereby insuring maximum heat transfer. . As stated above. the apparatus ot the inven tion is particularly suited to be connected dl rectly and mechanically with handling and/or burner end of the combustion chamber 4_0. It conveying drums of other equipment whereby the will be observed that at the end of the chamber 65 processing ofthe small parts may proceed in a 4II _opposite the burner 42.,there is provided av continuous manner and with a minimum of batch Venturi outlet 66 which is connected with the handling. For this_purpose the drum I6 is lo pipe 36 through the conduit 6I. Connected with cated fairly close to the iloor level and thecharg the outlet of the blower 46, and extending into ing end I2 is provided with a flange 61 which may the combustion chamber 46 is a conduit 62 which 70 be bolted to a similar flange of the end drum oi' a is provided with an end nozzle 63 positioned sub preceeding piece ofequipment as will be under stantially in the throat of the outlet 60. It should , frame provided by the members 21--26 at the also be observed that the conduit 46 supplying ' primary air for combustion is supplied from the stood...A When the drum III is so connected by the . nange 61 the supporting cradle I6 may rock one conduit 62. lSecondary air _for combustion and 75 way or the other thus avoiding the necessity ot . 2,412,133 . aligning the base 24, 25 accurately with respect to the base or frame of the preceding piece of equipment. ’ It should now be apparent that I have provided an improved unitary, portable, self-contained small parts drier which accomplishes the objects initially set out. The apparatus is compact, 6 ‘ tion, a flange connected to and extending radially outward of the outer end of said tapered portion and adapted to be rigidly and mechanically c'on-` nected to a rotating part of an adjoining appa ratus whereby material to be dried may be charged ' directly into said drum from said last mentioned apparatus, means in said drum to move the ma readily constructed, and highly eillcient in oper ation. The complete apparatus is light in weight and may readily be moved about on the skids 24, the only installation required being the provision blower supported on said uprights, and means comprising said blower to move heated air from of a gas connection and an electric current con said air heating means into said drum. I teriai iongitudinauy through said drum, air heating means supported on said vuprights, a nection. Skids 24 and structural members 25, 26, 2. Apparatus of the character described com 21, 28 and 28 constitute a portable frame en prising in combination a portable frame having abling the complete apparatus to be moved about 15 a base and uprights on said base, a, horizontally 4as a unit. disposed drying drum rotatably mounted in said rBy reason of the high 'temperature maintained ~ in the retort or combustion chamber 40 the fuel frame for rotation about an axis extending in ‘ termediate said uprights, means in said drum to consumed is much more eñìciently utilized since move the material being dried longitudinally complete combustion is effected. This is brought 20 ’through said drum, said drum having .a centrally about by furnishing an excess ofv secondary air open material charging end, air heating means through the valves 53' and, of course, any unused supported on l said uprights, a blower sup portion of the air as well as the hot gaseous prod ~ ‘ported on said uprights, anfair distributing duct . ucts of combustion is utilized as drying fluid in the extending centrally in said drum from the dis- . drum it. A substantial part of the heat gen l25 charge end thereof, and means comprising said erated is reclaimed by conduction through the blower and duct to move heated air from said wall of the drum and absorption in the air which air heating means into said drum. is drawn into the' casing 33-34, passed through ` 3. Portable drying apparatus having .a box-like the blower, and delivered to the drying'chamber ' frame, a tubular insulating shell mounted in said through the conduits 52 and 36. The helix .Il 30 frame, a rotary drying drum having a material aids in the conduction of the heat to the cylindri moving helix therein and rotatably mounted on cal shell of the drum I0. y . said frame for rotation about an axis substan While the use of above described burner and tially coincident with the longitudinal axis of said combustion chamber is the preferred method of ` shell, said drum projecting outwardly from either ' providing the necessary heat for the drying ap 35 end of said shell, a combus-tion chamber having paratus of the invention, it should be understood n a fluid fuel burner therein mounted on said frame that other suitable methods may be resorted to. above the discharge end of said drum andhaving For example, electric resistance heating elements a portion overhanging _the discharge end of said or steam coils enclosed in a suitable housing or chamber may be provided for this purpose. _ drum, a motor driven blower mounted on said 40 frame above th'e opposite end portion of said' The above specifically described embodiment oi drum> and having an inlet conduit communicat the invention should therefore be taken as illus ing with. the space intermediate said drum and trative only as obviously many changes may be shell, the bottom wall'of the overhanging portion made therein without departing from the spirit of---said combustion chamber having a `Venturi or scope of the invention.. Reference should 45 opening therein, a conduit connected with the therefore be had to the appended claims in 'de outlet of said blower and projecting through a , ' termining the scope and extent of the invention. wall of said combustion chamber to a discharging What I claim is: ’ ` ` position in said Venturi opening, a distributing 1. .Apparatus of the character described com tube projecting into the said discharge end ,of prising a portable frame having a base and up said drum, and a short curved tube interconnect rights on said base, a horizontally disposed drying ingsaid Venturi opening and said ydistributing drum rotatably mounted in said frame for rota tube. . tion about an axis extending intermediate said uprights, said drum having a tapered end p_or COLLIN M. DOYLE.