Патент USA US2127693код для вставки
Aug. 23, 1938. ' _w. A. M'cCANLES-S ET AL 2,127,693 PNEUMATIC CEMENT CONVEYER INVENTORS WILL/AM A. MCCANLESS ROBERT R. HENDERSON ATTORNEY. Patented Aug. 23, 1938 2,127,693 UNITED STATES PATENT OFFICE ' 2,127,693 PNEUMATIC'CEMIENT C‘ONVEYER William A. McCanless and Robert E. Henderson, Merced, Cali?,v assignors t0 Yosemite Portland Cement Corporation, Merced, Calif., a corpora. tion of Delaware Application April 16, 1937, Serial No. 137,261 '7 Claims. (Cl. 302-—50) This invention relates to pneumatic conveyers for ?nely divided or pulverulent materials, and particularly to means for continuously forcing dry Portland cement powder through conduits or pipes which may be several hundred feet long, from grinding mills to storage silos, by means of air under pressure. ' The principal object of the invention is to pro vide improved apparatus for the above mentioned 10 purpose which- will be more‘ effective than prior apparatus used for this purpose. ' I w A feature of the invention is to provide a con trol of the air blast around the foot of the column air released for conveying purposes cannot strike back into the source of supply of the powder (see Patents Nos. 1,202,088 and 1,258,911) . Our appa 5 ratus operates on the same principle, but is con siderably improved in construction over the prior apparatus used for this purpose, and gives better control over its operation. In the drawing 'I is a gravity feed chute as lead 1O ing the cement output of one or more grinding mills by gravity to a horizontally disposed cylin drical spiral conveyer box 2 in which is revolvably of ?owing cement. positioned a spiral conveyer 3 mounted on a Another feature is to provide a revolving pro peller to continuouslycut oil cement from a com pacted air-sealed feed column of cement and 15 hollow shaft 4. The spiral conveyer ?ts nicely within its box or throw it outward into the air blast. ?ight construction of gradually decreasing pitch _ cylinder and is here shown as of double lead or A still further feature is the longitudinal adjust ability of the propeller in relation to the compact toward the right-hand end so as to gradually compress toward that end the material being con veyed by it in direction of the arrow from the chute I. The ?ight of‘ the conveyer may be of triple‘ or single lead if desired, though we have found that the double lead ‘seems to operate more ing screw. e?iciently. A further feature is an independent drive for such a propeller so that it may be operated at high speed unaffected by the motion of the com? pacting screw. _’ I A further feature is the provision of air booster nozzles adjacent the propeller to aid in throwing the loosened cement out into the main air stream. A further feature is the provision of a cylinder 30 around the propeller extending forward of the same into the main air stream. - A still further feature is the provision of per forated air ejecting pipes around the propeller housing and means for adjusting the angularity 35 of the issuing air streams. Other features and advantages of our invention will appear in the following description and accompanying drawing. In the drawing: Figure 1 is a vertical section taken centrally through our improved pneumatic cement convey 25 The hollow conveyer shaft 4 passes out of the closed end 5 of the box through a suitable stuffing box or gland 6 and is rotatably supported in one or more bearings as at 'l and has a driving gear 8 secured to it and preferably a ball or roller thrust collar interposed between the gear hub and the bearing as indicated at 9. For the purpose of handling ground Portland cement, the spiral conveyer may be from about " four to six inches in diameter, and at its forward end the conveyer box is ?ared outward as at I0 to a larger size‘ and continues forward for about a foot as a larger cylinder I I, while surrounding and enclosing this'larger'cylinder II is a rectangular steel casing I2 closed at its rear end I 3 and welded or otherwise attached to cylinder I I so as to form Figure 3 is an enlarged vertical section of the an air-tight juncture therewith. Casing I2 is open and ?anged at I4 at its for ward end and connected to a similarly ?anged conical discharge pipe or duct I5 which tapers propeller shaft mounting and associated parts. Before describing the drawing in detail, it may down to a round outer'end I5’ where it connects to the conveyer pipe I6 for conveying the cement be stated that broadly it is old to continuously ~ deliver a column of ?ne loose or powdered mate rial to a spiral conveyer or compressing screw operating withinv a pipe to form a slowly advanc to the silo or other point desired. ing apparatus. ' _ Figure 2 is a cross section of Figure 1 as seen from the line 2—2 thereof. 55 object of the screw compressed column being to obtain an air seal through which the compressed ~ _ ing column of tightly compressed material, and then to apply air pressure to material released from the forward ‘end of this column to force vit Within the hollow spiral'conveyer shaft 4 is a propeller drive shaft I‘! to the inner end of which is attached a bladed propeller I8 for the purpose of cutting off and throwing a continuous’ rotary stream of cement from the compacted mass at its rear out through the forward end of cylinder I I through a pipe to thewpoint oi‘destination, the into- casing I2. - ' 55 2 2,127,693 charge end pulverulent material received at the other end, an enlarged casing enclosing the dis propeller shaft II is revolvably supported in oil less bushings I9 ?tted within the-outer end of hol charge end of the screw conveyer communicating with a discharge pipe for conveying the material low shaft 4 and sealed against back pressure of air to the desired point, means for forcing a stream 10 as by packing 20 held in place as by a threaded rected generally toward said discharge pipe, a ro At the outer or rear end of the propeller shaftv is a driving pulley 23 and its supporting bearing 24. A yoke collar 25 on the propeller shaft be tween bearings ‘I and 24 ?tted with a yoked shift ing lever 26 provides for slidi-ngthe propeller shaft longitudinally. The yoke lever may be moved screw conveyer arranged for ejecting material from the screw conveyer into said enlarged casing for taking up by said air stream, and means oper 15 able ~from without the casings for adjusting said propeller longitudinally of the screw conveyer to ating a traveling yoke nut 29 engaged by the shifting lever 26. By this means the propeller may be adjusted in cylinder I I and locked at any position while free to rotate. To inject air into the rear of casing I2 for forc 25 ing the powdered material through and out of cone I5, four perforated pipes 30 for compressed air are provided in quadrangular arrangement around cylinder II and the perforations 3| are directed forwardly in a manner to make the air 30 streams converge. To provide for proper angular adjustment of the perforations, we may gear all of the pipes to gether for simultaneous rotation as one is turned. Such gearing is shown in Figure 2 at 32. A bear 35 ing block 33 at each corner passes one of the pipes for turning and also revolvably supports the closed end of the adjacent pipe as indicated. Each of the pipes is providedwith a suitable sleeve joint 35, to permit turning while each is 40 connected to a service air pressure pipe 35. A handle 36,may be provided on any one of the pipes for simultaneously turning all of them and the outer end 3'! of the handle crank arm may be used as an indicator against suitable graduated 45 points 38 arranged on the casing; Besides the forward ejection of compressed air from perforated pipe 30, we provide several for wardly directed jet pipes 39 extending through the sides of cylinder II just in front of the pro 50 peller I8. These jets receive their air from a branch airpressure pipe line 40 under separate valve control 4 I. ‘ By the construction ' and arrangement de scribed, the powdered material from chute I to be 55 conveyed is, in the operation of the apparatus, tightly compacted in the forward end of the con veyor box 2 against reverse flow of air,v sliced off by the rapidly spinning propeller and thrown for ward in cylinder II to be picked up by jets 39, 60 which are preferably spirally arranged, and given a further spinning motion as it is hurled outward into the main air stream issuing from perforated pipes 30 all around cylinder I I and rapidly carried away through conical section I5 to the conveying 65 pipe line. , . While the apparatus has been developed partic ularly for the pneumatic conveying of cement, it may be adjusted through the means shown so as to successfully handle many kinds of ?nely di 70 of compressed air from said enlarged casing di 10 self-tightening gland 2 I. either way and locked at any'point as by a bolt 21 projecting from a lug 28 on bearing 24 and oper 20 We claim: 1. In a pneumatic conveyer of the character de scribed, a screw conveyer operatively mounted in a casing and arranged for compacting at its dis It is desirable that this propeller be longitudi nally adjustable in cylinder II to best suit the characteristics of various grades of ground mate rials being handled by the apparatus and to this end it is preferably provided with the shaft mounting as best shown in Fig. 3, and wherein the vided materials. , Having thus described our improved pneumatic conveying apparatus, it will be evident to anyone skilled in the art that minor changes may be made within the. spirit of the invention and scope 75 of the appended claims. tary propeller adjacent the discharge end of said regulate its distance from the discharge end thereof. '2. Ina pneumatic conveyer of the character described, a screw conveyer operatively mounted in a casing and arranged for compacting at its discharge end pulverulent material received at the other end, an enlarged casing enclosing the dis charge end of the screw conveyer communicating with a discharge pipe for conveying the material to the desired point, a compressed air pipe ar ranged in said enlarged casing provided with ori ?ces directed generally toward said discharge pipe, a propeller adjacent the discharge end of said screw conveyer arranged for ejecting mate rial from the screw conveyer into said casing for taking up by the air stream from said compressed air pipe, and an extension of the screw conveyer casing embracing said propeller and projecting ‘ forward of the same into said enlarged casing. 3. In the construction speci?ed in claim 2, means for ejecting compressed air into said ex tension in forwardly directed jets. 4. In the construction speci?ed in claim 2, means for ejecting compressed air into said ex tension in forwardly and spirally directed jets. 5. In a pneumatic conveyer of the character described, a screw conveyer operatively mounted in a casing ‘and arranged for compacting at its discharge end pulverulent material received at the other end, an enlarged casing enclosing the dis charge end of the screw conveyer communicating with a discharge pipe for conveying the material to the desired point, and a plurality of straight compressed air pipes in said enlarged casing ar ranged about the discharge end of said screw con veyer and provided with perforations in their side walls directing air jets forward of said conveyer casing toward said discharge pipe. 6. In a pneumatic conveyer of the character described, a screw conveyer operatively mounted in a casing and arranged for compacting at its discharge end pulverulent material received at the other end, an enlarged cas'mg enclosing the dis 60 charge end of the screw conveyer communicating with a discharge pipe for conveying the material to the desired point, a plurality of straight com pressed air pipes in said enlarged casing arranged about the discharge end of said screw conveyer and provided with perforations directed generally toward said discharge pipe, and means for turn ing said compressed air pipes to alter the direc tion of air streams from said perforations. 70 '7. In a pneumatic conveyer of the character de scribed, a screw conveyer operatively mounted in a casing and arranged for compacting at its dis charge end pulverulent material received at the other end, an enlarged casing enclosing the dis 75 2,127,898 charge end of the screw conveyer communicating with a discharge pipe for conveying the mate rial to the desired point, a plurality of straight compressed air pipes in said enlarged casing ar 3 generally toward said discharge pipe, and means for simultaneously turning all of said compressed air pipes to alter the direction of air streams from said perforations. ranged about the discharge end of said screw con WILLIAM A. MCCANLESS. veyer and provided with perforations directed ROBERT R. HENDERSON.