WO1982000282A1 - Dispositif de levage et de decharge de grains - Google Patents

Dispositif de levage et de decharge de grains Download PDF

Info

Publication number
WO1982000282A1
WO1982000282A1 PCT/US1981/000947 US8100947W WO8200282A1 WO 1982000282 A1 WO1982000282 A1 WO 1982000282A1 US 8100947 W US8100947 W US 8100947W WO 8200282 A1 WO8200282 A1 WO 8200282A1
Authority
WO
WIPO (PCT)
Prior art keywords
belt
grain
buckets
inches
head pulley
Prior art date
Application number
PCT/US1981/000947
Other languages
English (en)
Inventor
Inc Cargill
B Weis
F Wade
Original Assignee
Inc Cargill
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Inc Cargill filed Critical Inc Cargill
Priority to BR8108702A priority Critical patent/BR8108702A/pt
Publication of WO1982000282A1 publication Critical patent/WO1982000282A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G17/00—Conveyors having an endless traction element, e.g. a chain, transmitting movement to a continuous or substantially-continuous load-carrying surface or to a series of individual load-carriers; Endless-chain conveyors in which the chains form the load-carrying surface
    • B65G17/12—Conveyors having an endless traction element, e.g. a chain, transmitting movement to a continuous or substantially-continuous load-carrying surface or to a series of individual load-carriers; Endless-chain conveyors in which the chains form the load-carrying surface comprising a series of individual load-carriers fixed, or normally fixed, relative to traction element
    • B65G17/126—Bucket elevators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
    • B65G2201/04—Bulk

Definitions

  • the belt travels over the top or head pulley and returns downwardly thereby throwing the grain from the buckets into a collection zone or chute from which the grain is discharged through a spout into a desired receptacle.
  • Another object of the invention is to provide a new design for apparatus for lifting large amounts of grain having a different configuration from that heretofore provided.
  • a high volume throughput can be maintained at much lower belt speeds with resulting minimization of wear and tear on the apparatus.
  • the use of urethane buckets in the apparatus combines strength and durability with light weight -so that the various features of the invention can be enjoyed. More particularly, the urethane buckets permit each bucket to carry large volumes of grain so that a high volume throughput can be achieved in combination with plug flow of the grain.
  • Plug flow and efficient operation has been achieved in commercial operations at a belt speed of about 450 feet per minute which is about one-half the belt speed heretofore used in lifting grain.
  • the belt travels over a head pulley having a diameter of about 60 inches.
  • the buckets are attached to the belt on 14 inch centers by means of bolts.
  • the buckets are fabricated from urethane, weigh about 30 pounds each, and project outwardly from the belt to the bucket lip about 16 inches.
  • Each bucket is about 29 inches wide and 13 inches deep, and has capacity of about 1.5 bushels (3100 cubic inches) . in the event that a different head pulley diameter is used or that the bucket extension from the belt is changed, the belt speed should be adjusted to achieve the desired grain flow.
  • FIGURE 1 is a side elevational view of the grain lifting and discharge apparatus of the invention with portions broken away to show parts contained within the housing.
  • FIGURE 2 is a view taken along line A-A in Figure 1 showing the buckets on the belt.
  • FIGURE 4 is also a side view of an internal portion of the top section of a grain lifting and discharge apparatus, similar to Figure 3, but having an old, small bucket design and showing the grain being discharged in a rapid non-plug flow condition.
  • OMPI Journaled at the bottom of the casing 11 is a bottom or tail pulley 21 and at the top of the casing 11 there is journaled a top or head pulley 23, which is located above the discharge chute 17.
  • a belt 25, which is commercially available, is trained around the pulleys 21 and 23.
  • the belt 25 is driven in a conventional manner by a 500 horsepower motor (not shown) .
  • the belt 25 is 60 inches wide and is driven at a speed of about 450 feet per minute.
  • the diameter of the tail pulley 21 is not particularly critical to the operation of the apparatus of the invention but in the apparatus shown in the drawings, is 42 inches in diameter.
  • the diameter, of the head pulley shown in the drawings is 60 inches in diameter. As before indicated, the diameter of the head pulley 23 is important in relation to belt speed and the projection of the bucket lip from the belt surface.
  • Attached to the belt 25 are a series of transversely mounted buckets 27 for picking up grain in the boot 13, transporting the grain to the top of the casing 11, and discharging the grain to the discharge chute 17.
  • the buckets 27 are relatively light in weight, being fabricated from urethane, and weigh about 30 pounds each.
  • the rear wall 28 of each bucket 27 is bolted to the belt 25.
  • the buckets 27 are located on 14 inch centers.
  • the buckets 27 are 29 inches wide and the front wall 30 extends outwardly and is 16 inches from the belt surface at its lip 31 which is an important dimension for purposes of this invention.
  • Gussets 42 provide the buckets 27 with strength and rigidity.
  • the buckets are 13 inches in depth.
  • the buckets 27 are dimensioned to provide a grain capacity of 1.5 bushels (3100 cubic inches) and front walls 30 of the buckets 27 are angled with respect to the rear wall 28 to facilitate loading and emptying. Because the bucket 27 has a depth of 13 inches, there is a space of about 1 inch between the bottom of one bucket 27 and the top of the following bucket. In the apparatus, .as shown in Fig. 2, there are two rows of buckets 27 on the belt 25, thereby doubling the capacity of the apparatus. The buckets 27 in each row are staggered to provide balance to the belt.
  • the buckets 27 be made of a lightweight material that has the ability to withstand wear during operation.
  • One such material is urethane. Urethane buckets provide a unique combination of features for this invention by allowing high volume throughput at a belt speed slow enough to provide plug flow.
  • the boot 13 is continuously fed with grain to provide a reservoir of grain.
  • the buckets 27 attached to the belt 25, enter the grain reservoir and scoop up the grain as they move upwardly from the tail pulley 21.
  • the buckets 27 travel upwardly and over the head pulley 23 causing the grain to' be thrown from the buckets 27 into the chute 17 and out of the spout 19.
  • the plug flow condition of the grain flow, as it is discharged from the buckets 27, is obtained by • correlating the belt speed, head pulley diameter and the projection of the bucket lip 31 from the belt 25 surface.
  • Buckets 27 loaded with grain 33 are shown travelling upward toward the head pulley 23 on the right-hand portion of the belt 25 in Fig. 3.
  • the radial acceleration on a kernel of grain located at the lip 31 of the bucket 27 is balanced with the acceleration due to gravity.
  • the kernel of grain should remain motionless with respect to the bucket 27 until the orientation of the loaded bucket 27 has changed at least 90°. Some minor movement may, however, actually occur prior to this time primarily due to the angled relationship between the front 30 and rear 28 walls of the buckets 27.
  • the angled front wall 30 produces an outward resultant force from the centrifugal force acting on the grain.
  • the grain is then gently discharged, en masse as a "plug" 35 into the discharge chute 17 (not shown in Fig. 3) .
  • Plug flow should be compared with grain discharge from conventional metal buckets 27' that have generally been of smaller dimensions and operated with higher belt speeds to obtain comparable grain throughput (Fig. 4).
  • the buckets 27' travelling over the head pulley at high speed tend to "spray" the grain 33 in the area of the discharge chute 17 (not shown in Fig. 4).
  • the grain kernels collide with one another and the casing 11 causing damage to the grain and increasing dusting.
  • V the tangential velocity of a kernel of grain in feet per second as the bucket passes over the head pulley
  • R the radial distance of a kernel of grain from the head pulley center in feet.
  • R is then a function of the head pulley diameter, D (measured in inches), and the projection of the bucket 27 from the surface of the belt 25 to the bucket lip 31, designated as P (measured in inches) .
  • D measured in inches
  • P measured in inches
  • the belt 25 is often times up to one inch thick and the head pulley 23 may be provided with lagging (not shown) up to about an inch thick to help prevent belt slippage.
  • V is put in terms of D', P, and belt speed, S (measured in ft./min.), as follows:
  • the solid line represents belt speed, S, plotted as a function of effective head pulley diameter, D 1 , for the generation of plug flow from buckets having a 16 inch projection, P.
  • the two broken lines drawn on both sides of the above mentioned solid line represent a permissible plus or minus five percent deviation in belt speed for a given effective head pulley diameter. Experimentation has shown that a plus or minus five percent deviation in belt speed from that predicted by the derived formula will still produce plug flow conditions. Accordingly, experimental examples A through D have been plotted in Fig. 6 and are explained below.
  • Example A a grain lifting and discharge apparatus was fitted with a 60 inch diameter head pulley and a belt thickness of 3/8 inch thus yeilding an effective head pulley .diameter of 60.75 inches. The apparatusus was operated at a belt speed of 430 feet per minute and produced plug flow.
  • Example B apparatus having a 60 inch diameter head pulley, a belt thickness of 3/4 inch and one inch lagging was operated at a belt speed of 450 feet per minute.
  • the effective head pulley diameter, D', in Example B was 63-1/2 inches. Grain discharge from the buckets in Example B was also in the plug flow condition.
  • Example C the apparatus was operated at a belt speed of 400 feet per minute. This proved to be too low and the grain spilled out before the buckets 27 reached the discharge chute 17 resulting in a condition known as "back-legging".
  • Example D the apparatus was operated at a belt speed of 480 feet per minute which resulted in excessive spraying and throwing of the grain.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chain Conveyers (AREA)

Abstract

Dispositif de levage et de decharge de grains par ecoulement glissant sans cisaillement plastique permettant de reduire au minimum la deterioration du grain, la formation de poussieres et l'usure de l'installation. Une courroie (25) transportant des augets (27) legers est actionnee a une vitesse relativement faible et entrainee autour d'une poulie principale (23) et d'une poulie de renvoi (21). Le bord (31) des augets est en saillie vers l'exterieur depuis la surface de la courroie jusqu'a une distance predeterminee. La vitesse de la courroie (25), le diametre effectif de la poulie principale (23) et la saillie de l'auget par rapport a la courroie sont mis en correlation de maniere a assurer l'ecoulement de decharge desire par les augets (27).
PCT/US1981/000947 1980-07-14 1981-07-14 Dispositif de levage et de decharge de grains WO1982000282A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
BR8108702A BR8108702A (pt) 1980-07-14 1981-07-14 Elevador de graos e aparaelho de descarga

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US16855480A 1980-07-14 1980-07-14
US168554800714 1980-07-14
US28310881A 1981-07-13 1981-07-13
US283108 1981-07-13

Publications (1)

Publication Number Publication Date
WO1982000282A1 true WO1982000282A1 (fr) 1982-02-04

Family

ID=26864242

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1981/000947 WO1982000282A1 (fr) 1980-07-14 1981-07-14 Dispositif de levage et de decharge de grains

Country Status (4)

Country Link
AU (1) AU543690B2 (fr)
BR (1) BR8108702A (fr)
CA (1) CA1168181A (fr)
WO (1) WO1982000282A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1210662A (en) * 1915-12-30 1917-01-02 Arthur D Mcpherson Attaching-hanger for elevator-buckets.
US1295154A (en) * 1918-10-30 1919-02-25 Moline Mill Mfg Company Elevator-cup.
US2122036A (en) * 1937-05-13 1938-06-28 K I Willis Corp Elevator cup
US2370531A (en) * 1942-08-24 1945-02-27 Webster Mfg Inc Elevator bucket
US2557325A (en) * 1947-12-31 1951-06-19 Sherman T Transeau Bucket elevator
US3319774A (en) * 1965-10-05 1967-05-16 Lester B Knight & Associates I Elevating conveyor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1210662A (en) * 1915-12-30 1917-01-02 Arthur D Mcpherson Attaching-hanger for elevator-buckets.
US1295154A (en) * 1918-10-30 1919-02-25 Moline Mill Mfg Company Elevator-cup.
US2122036A (en) * 1937-05-13 1938-06-28 K I Willis Corp Elevator cup
US2370531A (en) * 1942-08-24 1945-02-27 Webster Mfg Inc Elevator bucket
US2557325A (en) * 1947-12-31 1951-06-19 Sherman T Transeau Bucket elevator
US3319774A (en) * 1965-10-05 1967-05-16 Lester B Knight & Associates I Elevating conveyor

Also Published As

Publication number Publication date
BR8108702A (pt) 1982-06-01
AU7453281A (en) 1982-02-16
AU543690B2 (en) 1985-04-26
CA1168181A (fr) 1984-05-29

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