CN111620054A - Rectilinear spiral screw feeder cereal hoisting device - Google Patents

Rectilinear spiral screw feeder cereal hoisting device Download PDF

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Publication number
CN111620054A
CN111620054A CN202010638464.0A CN202010638464A CN111620054A CN 111620054 A CN111620054 A CN 111620054A CN 202010638464 A CN202010638464 A CN 202010638464A CN 111620054 A CN111620054 A CN 111620054A
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CN
China
Prior art keywords
auger
base
fixed
roller
spiral
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
CN202010638464.0A
Other languages
Chinese (zh)
Inventor
张吉军
贾昕宇
曹龙奎
张紫恒
衣淑娟
唐正
程新江
罗春兴
车刚
刘天祥
王维浩
姜艳彬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heilongjiang Bayi Agricultural University
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Heilongjiang Bayi Agricultural University
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 Heilongjiang Bayi Agricultural University filed Critical Heilongjiang Bayi Agricultural University
Priority to CN202010638464.0A priority Critical patent/CN111620054A/en
Publication of CN111620054A publication Critical patent/CN111620054A/en
Pending legal-status Critical Current

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    • 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
    • B65G33/00—Screw or rotary spiral conveyors
    • B65G33/24—Details
    • 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
    • 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
    • B65G23/00—Driving gear for endless conveyors; Belt- or chain-tensioning arrangements
    • B65G23/02—Belt- or chain-engaging elements
    • B65G23/04—Drums, rollers, or wheels
    • 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
    • B65G23/00—Driving gear for endless conveyors; Belt- or chain-tensioning arrangements
    • B65G23/22—Arrangements or mountings of driving motors
    • 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
    • B65G33/00—Screw or rotary spiral conveyors
    • B65G33/24—Details
    • B65G33/26—Screws
    • 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
    • B65G33/00—Screw or rotary spiral conveyors
    • B65G33/24—Details
    • B65G33/32—Adaptations of bearings or couplings for supporting and connecting screws
    • 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
    • B65G33/00—Screw or rotary spiral conveyors
    • B65G33/24—Details
    • B65G33/34—Applications of driving gear
    • 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
    • B65G41/00—Supporting frames or bases for conveyors as a whole, e.g. transportable conveyor frames
    • 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
    • B65G47/00—Article or material-handling devices associated with conveyors; Methods employing such devices
    • B65G47/34—Devices for discharging articles or materials from conveyor 
    • 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
    • B65G2201/042—Granular material

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Threshing Machine Elements (AREA)

Abstract

The invention relates to a vertical spiral auger grain lifting device, which consists of a driving motor, a roller shaft support frame, a cylindrical barrel, a door-shaped frame and a base, wherein an auger base is fixed on the base, a spiral auger is fixed on the auger base, the top end of the spiral auger is connected with an output shaft of an auger motor, the cylindrical barrel concentric with the auger base is sleeved outside the spiral auger, the roller shaft support frame adjacent to the auger base is fixed on one side of the auger base, a lower roller support shaft with a lower roller arranged on the outer side is fixed at the lower end of the roller shaft support frame, an upper roller support shaft with an upper roller arranged on the outer side is fixed at the upper end of the roller shaft support frame, a chain type transmission part is arranged between the upper roller and the lower roller in a transmission manner, and a baffle part with the same length as a chain type plate is fixed. The vertical spiral auger grain lifting device is reasonable in structural design, the rotating speed of the auger can be properly reduced, and the conveying target with large conveying capacity and large conveying height can be realized without high rotating speed.

Description

Rectilinear spiral screw feeder cereal hoisting device
Technical Field
The invention belongs to a lifting device, and particularly relates to a vertical spiral auger grain lifting device.
Background
According to the different positions of the screw auger, three modes of horizontal conveying, inclined conveying and vertical conveying are available. The horizontal conveying mode and the inclined conveying mode are most widely applied; the vertical conveying is applied in certain occasions, the rotating speed of a screw auger of a vertical screw auger conveyor is much higher than that of horizontal conveying and inclined conveying, and materials added at high rotating speed generate strong friction with a machine body under the action of centrifugal force, so that the gravity of descending of the materials is overcome, and the vertical conveying of the materials is realized. At present, under the condition that the quantity of conveyed materials is large, the gravity of the materials is difficult to overcome by the centrifugal force and the frictional resistance generated by high rotating speed, the materials sink and cannot be conveyed, if the conveying height is high, the vertical conveying is difficult to realize, and the rotating speed cannot be too high under certain structural design conditions. Therefore, under the conditions of large conveying capacity and large conveying height, the traditional vertical screw conveyer can not realize normal conveying.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a vertical spiral auger grain lifting device.
The invention relates to a vertical spiral auger grain lifting device, which consists of a driving motor, a roller shaft support frame, a cylindrical barrel, a gate-shaped frame and a base, wherein an auger base is fixed on the base, a spiral auger is fixed on the auger base, the top end of the spiral auger is connected with an output shaft of the auger motor, the cylindrical barrel concentric with the auger base is sleeved outside the spiral auger, one side of the auger base is fixed with the roller shaft support frame adjacent to the auger base, the lower end of the roller shaft support frame is fixed with a lower roller support shaft of which the outer side is provided with a lower roller, the upper end of the roller shaft support frame is fixed with an upper roller support shaft of which the outer side is provided with an upper roller, one end of the lower roller support shaft is in transmission connection with the driving motor fixed at the upper end of the base through a belt, a baffle type chain type transmission part is arranged between the upper roller and the lower roller in transmission, baffle plates with the same length as the chain plates are fixed at the center positions of the outer sides of the chain plates.
As a further improvement of the invention, the lower end of the cylindrical barrel is provided with a feed inlet, the upper end of the cylindrical barrel is provided with a discharge outlet, the maximum height of the discharge outlet is positioned below the first screw at the upper end of the screw auger, and the minimum height of the feed inlet is positioned above the first screw at the lower end of the screw auger.
As a further improvement of the invention, a gate-shaped frame with the bottom end fixed on the auger base is arranged outside the cylindrical barrel, the top end of the gate-shaped frame is positioned above the top end of the cylindrical barrel, the bottom of the auger motor is fixed on a cross frame of the gate-shaped frame, and a power end passes through the cross frame of the gate-shaped frame and is connected with the screw auger.
As a further improvement of the invention, the side of the cylinder barrel and the side of the auger base opposite to the roller shaft supporting frame are respectively provided with an opening and a radial strip-shaped opening which have the same width and are aligned with each other, the width of the opening and the strip-shaped opening is slightly larger than the thickness of the baffle piece, the length of the strip-shaped opening is shorter than the length of the radius of the auger base, and the height of the opening is the same as the height of the cylinder barrel.
As a further improvement of the invention, the upper roller and the lower roller have the same size, more than four groups of gear teeth are distributed on the surface of the upper roller and the lower roller in parallel, two grooves matched with the gear teeth are arranged on the chain plate, and the two grooves are respectively positioned on two sides of the baffle piece.
As a further improvement of the invention, the upper and lower surfaces of the baffle member and the side opposite the screw auger are provided with felt.
As a further improvement of the invention, the screw auger is opposite to the baffle piece, and the baffle piece is inserted in the spiral groove corresponding to the screw auger.
As a further improvement of the invention, two symmetrical side supporting frames are fixed on two sides of the baffle piece on the surface of the roller shaft supporting frame, and the bottoms of the side supporting frames are fixed on the base.
As a further improvement of the invention, a plurality of rolling wheels are arranged at the bottom of the base.
The vertical spiral auger grain lifting device is reasonable in structural design and convenient to use, can effectively balance the gravity of materials, can properly reduce the rotating speed of an auger, and can realize the conveying target of large conveying capacity and large conveying height without high rotating speed.
Drawings
FIG. 1 is a side view of the vertical auger grain elevator of the present invention;
FIG. 2 is a schematic view of the vertical screw auger grain elevator of the present invention;
FIG. 3 is a schematic view of the construction of the auger, upper roller, lower roller, baffle chain drive, and baffle members of the present invention;
FIG. 4 is a schematic view of the transmission between the lower roller and the baffled chain drive of the present invention;
FIG. 5 is a schematic view of the construction of the cylindrical drum of the present invention;
FIG. 6 is a schematic view of the structure of the base of the screw feeder of the present invention.
Detailed Description
The invention relates to a vertical spiral auger grain lifting device, which consists of a driving motor 1, a roller shaft support frame 3, a cylindrical barrel 7, a door-shaped frame 9 and a base 11, wherein a plurality of rolling wheels 12 are arranged at the bottom of the base 11 and used for moving the device, an auger base 18 is fixed at the upper end of the base 11, a spiral auger 10 is fixed at the central position of the top end of the auger base 18, the cylindrical barrel 7 concentric with the auger base 18 is sleeved outside the spiral auger 10, a feed inlet 13 is arranged at the lower end of the cylindrical barrel 7, a discharge outlet 14 is arranged at the upper end of the cylindrical barrel 7, the door-shaped frame 9 with the bottom end fixed on the auger base 18 is arranged outside the cylindrical barrel, the top end of the door-shaped frame 9 is positioned above the top end of the cylindrical barrel 7, the bottom of the auger motor 8 is fixed on a cross frame of the door-shaped frame 9, and a power end. And a roller shaft supporting frame 3 adjacent to the screw feeder base 18 is fixed on one side of the screw feeder base. The side, opposite to the roller shaft support frame 3, of the cylindrical barrel 7 and the auger base 18 is respectively provided with an opening 20 and a radial elongated opening 19 which are identical in width and aligned with each other, the length of the elongated opening 19 is shorter than the radius length of the auger base 18, the height of the elongated opening 19 is identical to the height of the auger base 18, and the height of the opening 20 is identical to the height of the cylindrical barrel 7.
The lower end of the roller shaft supporting frame 3 is fixed with a lower roller supporting shaft 2, the outer side of which is provided with a lower roller 17, the upper end of the roller shaft supporting frame is fixed with an upper roller supporting shaft 4, the outer side of which is provided with an upper roller 15, one end of the lower roller supporting shaft 2 is in transmission connection with a driving motor 1 fixed at the upper end of a base 11 through a belt, a baffle type chain transmission part 5 is arranged between the upper roller 15 and the lower roller 17 in chain transmission, the baffle type chain transmission part 5 is formed by connecting more than one chain plates 26 through a cylindrical pin 23, the cylindrical pin 23 can realize the rotation motion between the chain plates 26, and baffle pieces 16 with the same length as the chain plates 26 are fixed at the central. The width of the opening 20 and the width of the elongated opening 19 are both 0.5-1 cm larger than that of the baffle piece 16, the length a of the baffle piece 16 is in clearance fit with the length b from the central shaft of the spiral auger 10 to the outer side of the chain plate 26, and in the transmission process of the baffle piece 16 between the upper roller 15 and the lower roller 17 through the baffle type chain transmission piece 5, the vertical plate on the side opposite to the cylindrical drum 7 can penetrate through the cylindrical drum 7 and the auger base 18 through the opening 20 and the elongated opening 19.
The upper roller 15 and the lower roller 17 are the same in size, more than four groups of gear teeth 21 are distributed on the surfaces of the upper roller 15 and the lower roller 17 in parallel, the double rows of gear teeth 21 ensure the working strength of the gear teeth 21 and the running stability of the baffle piece 16, two grooves 22 matched with the gear teeth 21 are formed in the chain plates 26, the two grooves 22 are respectively located on two sides of the baffle piece 16, and when the chain plates 26 are meshed with the lower roller 17 and the upper roller 15, the center distance between the grooves 22 on the two adjacent chain plates 26 is the same as the center distance between the two gear teeth 21 matched with the chain plates. When the lower roller 17 rotates, the gear teeth 21 are inserted into the grooves 22 to drive the baffle type chain transmission element 5, so that the upper roller 15 is driven to rotate as the lower roller 17, and one end of the gear teeth 21 inserted into the grooves 22 is provided with a round chamfer for convenient insertion. Two symmetrical side supporting frames 6 are fixed on two sides of a baffle piece 16 on the surface of the roller shaft supporting frame 3, and the bottoms of the side supporting frames 6 are fixed on the base 11 for side supporting and reinforcing. The center distance between the upper roller 15 and the lower roller 17 is close to the axial length of the spiral part of the spiral screw 10, the spiral screw 10 is opposite to the baffle piece 16, the spiral blades are spirally inserted in the gap between the baffle piece 16 and are matched with each other, the pitch of the spiral blades of the spiral screw 10 is slightly larger than the height of the baffle piece 16, the baffle piece 16 and the gap between the baffle piece and the baffle piece are matched, and the lower surface of the baffle piece 16 and the side surface opposite to the spiral screw 10 are provided with felts 24 to reduce friction and obstruction and prevent materials from leaking out of the gap between the spiral screw 10 and the baffle piece 16.
When rectilinear spiral screw feeder cereal hoisting device during operation, open driving motor 1 and screw feeder motor 8 and make spiral screw feeder 10, go up gyro wheel 15 and lower roller 17 all rotate, according to the requirement of cereal conveying capacity, confirm that the rotational speed proportion of spiral screw feeder 10 and last gyro wheel 15 and lower roller 17 is about 7.4: 1, when the screw auger 10 rotates clockwise according to its axis, the lower roller 17 also rotates clockwise according to its axis to drive baffle type chain transmission 5 and upper roller 15 to do clockwise motion, baffle piece 16 alternates in the corresponding helicla flute with screw auger 10, baffle piece 16 can play the effect of "holding in the palm" to screw auger 10, consequently can effectively balance material gravity, can suitably reduce the rotational speed to screw auger 10 simultaneously. The maximum height of the discharge port 14 is positioned below the first spiral at the upper end of the spiral auger 10, the lowest height of the feed port 13 is positioned above the first spiral at the lower end of the spiral auger 10, grain materials enter a gap between the spiral auger 10 and the cylindrical barrel 7 from the feed port 13, the spiral blades of the spiral auger 10 push the materials to do circular motion, the materials meet the baffle piece 16 in rotation and are supported by the baffle piece 16, the materials possibly generate pressure on the baffle piece 16 in the vertical conveying process, and the opening 20 in the cylindrical barrel 7 can support the baffle piece 16 to weaken the deflection of the baffle piece 16. With the movement of the baffle members 16, the material is gradually lifted along the spiral space of the screw auger 10 under the pushing of the baffle members 16 until the lifting device is discharged from the discharge port 14 after being lifted to the top, thereby realizing the vertical lifting of the grain material. The vertical spiral auger grain lifting device provided by the invention mainly vertically conveys grains, beans and grain materials with certain particle sizes, and does not convey powder or non-grain materials.

Claims (9)

1. A vertical spiral auger grain lifting device is composed of a driving motor (1), a roller shaft support frame (3), a cylindrical drum (7), a door-shaped frame (9) and a base (11), and is characterized in that an auger base (18) is fixed on the base (11), a spiral auger (10) is fixed on the auger base (18), the top end of the spiral auger (10) is connected with an output shaft of an auger motor (8), the cylindrical drum (7) concentric with the auger base (18) is sleeved outside the spiral auger (10), one side of the auger base (18) is fixed with the roller shaft support frame (3) adjacent to the spiral auger, a lower roller support shaft (2) of which the outer side is provided with a lower roller (17) is fixed at the lower end of the roller shaft support frame (3), an upper roller support shaft (4) of which the outer side is provided with an upper roller (15) is fixed at the upper end of the auger base, one end of the lower roller support shaft (2) is in transmission connection with the driving motor (1) fixed at the upper end of, the baffle type chain transmission element (5) is arranged between the upper roller (15) and the lower roller (17) in a transmission mode, the baffle type chain transmission element (5) is formed by connecting more than one chain plate (26) through a cylindrical pin (23), baffle pieces (16) with the same length as the chain plates (26) are fixed at the center of the outer side of each chain plate (26), and the baffle type chain transmission element (5) is arranged in the cylindrical barrel (7) and matched with the spiral auger (10).
2. A vertical screw auger grain elevator as claimed in claim 1 wherein the lower end of the cylindrical drum (7) is provided with a feed inlet (13) and the upper end is provided with a discharge outlet (14), the maximum height of the discharge outlet (14) being below the first screw at the upper end of the screw auger (10) and the minimum height of the feed inlet (13) being above the first screw at the lower end of the screw auger (10).
3. A vertical screw auger grain lifting device as claimed in claim 1 or 2 wherein the outer side of the cylindrical drum (7) is provided with a gate-shaped frame (9) with the bottom end fixed on the auger base (18), the top end of the gate-shaped frame (9) is located above the top end of the cylindrical drum (7), the bottom of the auger motor (8) is fixed on the cross frame of the gate-shaped frame (9), and the power end passes through the cross frame of the gate-shaped frame (9) and is connected with the screw auger (10).
4. A vertical screw auger grain elevator according to claim 1 or 2, wherein the side of the cylindrical drum (7) and auger base (18) opposite the roller shaft support (3) is provided with an opening (20) and a radially elongated opening (19) of the same width and aligned with each other, respectively, the width of the opening (20) and the elongated opening (19) being slightly greater than the thickness of the baffle member (16), the length of the elongated opening (19) being shorter than the length of the radius of the auger base (18), and the height of the opening (20) being the same as the height of the cylindrical drum (7).
5. The vertical screw auger grain elevator as in claim 1, wherein the upper roller (15) and the lower roller (17) are of the same size and have four or more sets of gear teeth (21) distributed in parallel on the surface, the chain plate (26) is provided with two grooves (22) matching with the gear teeth (21), and the two grooves (22) are located on the two sides of the baffle member (16).
6. A vertical screw auger grain elevator as claimed in claim 1 wherein the upper and lower surfaces of the dam member (16) and the side opposite the screw auger (10) are provided with felt (24).
7. A vertical screw auger grain elevator as claimed in claim 1 wherein the screw auger (10) is opposed to the barrier member (16) and the barrier member (16) is interspersed in helical grooves corresponding to the screw auger (10).
8. A vertical screw auger grain lifting apparatus as claimed in claim 1 wherein two side support frames (6) are symmetrically fixed to both sides of the surface baffle member (16) of the roller shaft support frame (3), the bottom of each side support frame (6) being fixed to the base (11).
9. A vertical screw auger grain elevator as claimed in claim 1 wherein a plurality of rolling wheels (12) are mounted to the base (11) at the bottom thereof.
CN202010638464.0A 2020-07-06 2020-07-06 Rectilinear spiral screw feeder cereal hoisting device Pending CN111620054A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010638464.0A CN111620054A (en) 2020-07-06 2020-07-06 Rectilinear spiral screw feeder cereal hoisting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010638464.0A CN111620054A (en) 2020-07-06 2020-07-06 Rectilinear spiral screw feeder cereal hoisting device

Publications (1)

Publication Number Publication Date
CN111620054A true CN111620054A (en) 2020-09-04

Family

ID=72268563

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010638464.0A Pending CN111620054A (en) 2020-07-06 2020-07-06 Rectilinear spiral screw feeder cereal hoisting device

Country Status (1)

Country Link
CN (1) CN111620054A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112056797A (en) * 2020-09-14 2020-12-11 杭州点特家居用品有限公司 Rotatory device of going up book of intelligence bookshelf

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112056797A (en) * 2020-09-14 2020-12-11 杭州点特家居用品有限公司 Rotatory device of going up book of intelligence bookshelf

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