GB2081840A - Vibratory conveyor - Google Patents
Vibratory conveyor Download PDFInfo
- Publication number
- GB2081840A GB2081840A GB8038569A GB8038569A GB2081840A GB 2081840 A GB2081840 A GB 2081840A GB 8038569 A GB8038569 A GB 8038569A GB 8038569 A GB8038569 A GB 8038569A GB 2081840 A GB2081840 A GB 2081840A
- Authority
- GB
- United Kingdom
- Prior art keywords
- exciter
- base
- carrying member
- secured
- trough
- 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.)
- Granted
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
- B65G27/00—Jigging conveyors
- B65G27/10—Applications of devices for generating or transmitting jigging movements
- B65G27/16—Applications of devices for generating or transmitting jigging movements of vibrators, i.e. devices for producing movements of high frequency and small amplitude
- B65G27/18—Mechanical devices
- B65G27/20—Mechanical devices rotating unbalanced masses
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jigging Conveyors (AREA)
Abstract
A vibratory conveyor in which the vibrations have a substantially greater horizontal than vertical movement, and the vertical acceleration of material carried by the conveyor is less than the acceleration of gravity so that the material conveyed does not physically leave the surface of the conveyor. The result is a smooth flow of material from one end of the trough to the other. In one embodiment, the conveyor comprises a trough (31) pivotally connected by legs (32) to a base (35). Force transmitting springs (52), at an angle of 10 DEG to 20 DEG to the horizontal, connect the through with an exciter-balancer (39) operatively connected to an exciter arrangement (41-50). Horizontal isolation springs (37,38) buffer the trough and exciter- balancer at each end against stops (36). <IMAGE>
Description
SPECIFICATION
Vibratory conveyor
Vibratory conveyors have been known and used for many years. In the usual type of vibratory conveyor, the material-carrying trough is vibrated at an angle to the horizontal normally of the order of 45 degrees.
The material conveyed is, in effect, bounced along the trough from one end to the other to effect the conveying action. Thus, for most of the travel the material is airborne, striking the material-carrying surface only long enough to be relaunched into the air in the direction of the discharge end of the conveyor. The vibratory action has been used not only for conveying articles from one end of the trough to the other, but also for other purposes such as, for example, the removal of sand from castings by the jarring or impact nature of the vibratory conveying action. Thus, the trough may be provided with a foraminous lower surface through which sand may pass as it is jarred loose from the castings. An example of such an apparatus is to be found in U.S.
Patent No. 3,335,861.
Because of the bouncing nature of the conveying actions, it has heretofore been difficult, if not impossible, for a worker standing alongside the trough to actually perform any work on the articles being conveyed. Thus, in a foundry operation, it is customary for a worker to knock the sprue from a casting with a hammer, but in order to do so the casting must be at rest or at least maintained in a position where such a blow can be delivered with a reasonable degree of accuracy. Heretofore, this could not be accomplished while the casting was passing along a vibratory conveyor.
We have now devised an improved vibratory conveyor wherein the conveying action is relatively smooth and thus the articles being conveyed appear to flow from one end of the conveyor to the other rather than to bounce therealong. The smooth flow is accomplished by arranging the supports carrying the conveying trough in a manner to predetermine the vibratory direction of the trough so as to permit the trough to move primarily horizontally with only a small but necessary vertical component to facilitate conveying action. Thus, the motion of the trough is at an angle of close to 10 degrees to the horizontal, some 80 degrees from the vertical. The arrangement is such that the vibratory forces applied to the trough in a vertical direction accelerate the material in the trough upwardly at a lesser degree than the acceleration due to gravity.Thus, the articles never leave the trough but are always supported thereby, although because there is a vertical component in the vibration, the articles are substantially unweighted during the vibratory cycle and will appear to flow from one end of the conveyor to the other. As the motion of the articles being conveyed is smooth and without bounce, it is easy for a workman standing beside the trough to deliver a blow to the sprue of a casting and free the casting therefrom.
Afeature of the invention is the unique mounting and supportforthe material-carrying trough and exciter relative to the base, the particular arrangement being one in which the base for the most part is supporting only the weight of the apparatus, i.e., the weight of the trough and exciter, and the dynamic forces generated by the vibrations of the trough and exciter are isolated from the base so that substantially no dynamic forces are transmitted to the base.
This is a particularly important feature in very long conveyors where heretofore substantial dynamic forces were transmitted to the base and thus required a much heavier construction.
According to the invention, there is provided a vibratory conveyor comprising an elongated material-carrying member, a base, a plurality of legs supporting the trough each leg having one end pivotally secured to the material-carrying member and the other end pivotally secured to the base, each leg extending from base to trough at an angle of from 70" to 800 with the horizontal, a plurality of isolation springs each isolation spring having one end connected to the material-carrying member and the other end connected to the base, each isolation spring extending from the base to the materialcarrying member at an angle with the horizontal of 20 or less, an exciter member, said exciter member being elongated in the direction of the elongation of the material-carrying member and said exciter member having a mass equal to approximately one-half of the mass of the material-carrying member, a plurality of arms suspending the exciter from the material-carrying member, each of said arms having one end pivotally secured to the material-carrying member and the other end pivotally secured to the exciter member, a plurality of force transmitting springs, each of said force transmitting springs having one end secured to the material-carrying member and the other end secured to the exciter member, each force transmitting spring extending upwardly from the exciter member to the materiaicarrying member at an angle of from 10 to 200 with the horizontal, a motor mounted on the base, an eccentric shaft rotatably carried by the materialcarrying member, a belt drive connecting the motor to the shaft to rotate the shaft, a crank arm having one end yieldably carried by the eccentric shaft and yieldably secured at its other end to the exciter member.
The invention also provides a vibratory conveyor comprising an elongated material-carrying member, a base, a plurality of legs supporting the trough each leg having one end pivotally secured to the materialcarrying member and the other end pivotally secured to the base, each leg extending from base to trough at an angle of from 70" to 80" with the horizontal, first isolation spring means secured to the base at each end thereof and mounted to extend horizontally adjacent to but spaced from the end of the material-carrying member, second isolation spring means secured to the base at each end thereof and mounted to extend horizontally adjacent to but spaced from the end of the exciter member, said first isolation spring means having a spring stiffness approximately double the stiffness of the second isolation spring means, an exciter member, said exciter member being elongated in the direction of the elongation of the material-carrying member and said exciter member having a mass equal to approximately one-half of the mass of the materialcarrying member, a plurality of arms suspending the exciter from the material-carrying member, each of said arms having one end pivotally secured to the material-carrying member and the other end pivotally secured to the exciter member, a plurality of force transmitting springs, each of said force transmitting springs having one end secured to the materialcarrying member and the other end secured to the exciter member, each force transmitting spring extending upwardly from the exciter member to the material-carrying member at an angle of from 10 to 20 with the horizontal, a motor mounted on the base, an eccentric shaft rotatably carried by the material-carrying member, a belt drive connecting the motor to the shaft to rotate the shaft, a crank arm having one end yieldably carried by the eccentric shaft and yieldably secured at its other end to the exciter member.
The invention further provides a vibratory con veyorcomprising an elongated material-carrying member, a base, a plurality of legs supporting the trough each leg having one end pivotally secured to the material-carrying member and the other end pivotally secured to the base, each leg extending from base to trough at an angle of from 70" to 80" with the horizontal, first isolation spring means secured to the base at each end thereof and mounted to extend horizontally adjacent to but spaced from the end of the material-carrying member, second isolation spring means secured to the base at each end thereof and mounted to extend horizontally adjacent to but spaced from the end of the exciter member, said first isolation spring means having a spring stiffness approximately double the stiffness of the second isolation spring means, an exciter member, said exciter member being elongated in the direction of the elongation of the material-carrying member and said exciter member having a mass equal to approximately one-half of the mass ofthe material-carrying member, a plurality of arms suspending the exciter from the materialcarrying member, each of said arms having one end pivotally secured to the material-carrying member and the other end pivotally secured to the exciter member, a plurality of force transmitting springs, each of said force transmitting springs having one end secured to the material-carrying member and the other end secured to the exciter member, each force transmitting spring extending upwardly from the exciter member to the material-carrying member at an angle of from 10 to 200 with the horizontal, a motor mounted on the base, an eccentric shaft rotatablycarried by the material-carrying member, a belt drive connecting the motor to the shaft to rotate the shaft, a crank arm having one end yieldably carried by the eccentric shaft and yieldably secured at its other end to the exciter member, said force transmitting springs in combination with the material-carrying member and the exciter member having a predetermined natural frequency and said motor and belt drive being constructed and arranged to rotate said eccentric shaft at a speed near but below said natural frequency.
In order that the invention may be more fully understood, an embodiment thereof will now be described by way of example only, with reference to the accompanying drawings, in which:
Figure 1 is a side elevational view of an end portion of an elongate conveyor embodying the invention; and
Figure 2 is a vertical section along line 4-4 of
Figure 1.
Referring to the drawings, there is shown a vibratory conveyor 30 having a material-carrying member in the form of a trough 31. The trough is elongated, from an entrance chute (not shown) at the left hand side (as seen in Figure 1). The trough is carried by a plurality of parallel legs 32, each pivotally secured at its upper end to brackets 33 mounted on the underside of the trough 31 and at its lower end to bracket 34 mounted upon a base 35 fixed to the building or other structure in which the apparatus is housed. Only one legs 32, is shown, but there are a plurality spaced along the conveyor. Each leg is arranged at an angle of 70 to 80 degrees to the horizontal with an angle of approximately 72-1/2 degrees being preferred.
At each end of the base 35 is secured an upstanding stop member 36 (only one end is shown in Figure 1). Secured to each of the stop members 36 are isolation springs 37 and 38. The isolation springs extend horizontally and are arranged to be contacted by the trough 31 and an exciter-balancer member 39 which is supported from the trough by a plurality of pivoted links 40.
In an alternative arrangement, the isolation springs may extend from the base 35 to the trough 31 at an angle with the horizontal of 20 or less.
The exciter member 39 has a weight equal to approximately one-half the weight of the materialcarrying member 31 and the spring 38 has a stiffness equal to approximately one-half the stiffness of the spring 37. Thus, as the material-carrying member 31 and exciter-balancer member 39 move in opposite directions, the impact of the material-carrying member against the spring 37, for example to the left in
Figure 1, is counteracted by the impact of the exciter-balancer member 39 against a spring in the right-hand end of the base 35 comparable to the spring 38. Thus, the forces exerted on the base are substantially equal and opposite.
For creating the vibratory movements of the material-carrying member and exciter-balancer, there is provided a motor 41 (usually an electric motor) mounted on the base 35 and connected by means of a belt drive 42 to a wheel 43 secured to an eccentric shaft 44. The eccentric shaft 44 carries a crank arm member 45 connected to a bracket 46 secured to the exciter member 39. The connection of the crank arm member 45 to the exciter 39 is flexible or cushioned as shown in Figure 2. Thus, there is upstanding from the upper surface 47 of the exciter member the space brackets 46 and a shaft 48 provided with nuts 49 serves to brace the inner faces of the crank arm 45 against annular rubber members 50. Thus, the driving connection between the crank arm assembly 45 and the exciter member is cushioned or resilient inasmuch as the drive is transmitted through shear of the rubber members 50.
Along the upper surface of the exciter member 39 are a number of brackets 51 carrying force transmitting springs 52, the opposite ends of which bear against a bracket assembly 53 secured to the underside of the material-carrying member 31. Arms 40, at substantially the same angle as legs 32, link the underside of member 31 to the upper surface of member 39. A plurality of such force transmitting spring assemblies are provided along the conveyor interconnecting the material-carrying member and the exciter. Each spring extends at an angle to the horizontal of 100 to 20 .
Because the direction of vibration of the trough 31 is within a few degrees of the horizontal, the motion is primarily horizontal and thus very little vertical vibrational force must be carried by the base 35.
Because the vertical fibrational force is minimized, the vibratory conveyor of the present invention may be mounted on a relatively light foundation and thus may be actually mounted and used on upper floors of a building rather than being confined to the lowermost floor where it can be supported on relatively massive foundations.
Furthermore, because of the arrangement of the legs 32 and the isolation springs 37,38, substantially none of the dynamic force of the vibrating masses is transmitted to the base 35. The absence of such dynamic force on the base permits itto be designed simply to carry the;weig ht of the apparatus without necessarily possessing the strength to absorb and accommodate dynamic vibrational forces normally imparted to such bases in the normal form of construction of vibratory conveyors.
The vibratory conveyor of Figure 1 operates in a manner to provide a vertical acceleration to particulate material carried by the trough of less than the acceleration of gravity. Because the vibratory forces are substantially isolated by the isolation spring assemblies 37 and 38, no special foundations for the base 35 are required.
In the arrangement shown, the force transmitting springs in combination with the exciter member and material-carrying member form a two massvibra- tory system having a natural frequency. It is desirable that the rotation of the eccentric shaft 44 be at a speed substantially equal to but slightly below such natural frequency. Hence, the size of the grooved wheels over which the belt 42 passes and the speed of the motor 41 are arranged to produce rotation of the eccentric shaft at that speed.
Claims (4)
1. A vibratory conveyor comprising an elongated material-carrying member, a base, a plurality of legs supporting the trough each leg having one end pivotally secured to the material-carrying member and the other end pivotally secured to the base, each leg extending from base to trough at an angle of from 70" to 80" with the horizontal, a plurality of isolation springs each isolation spring having one end connected to the material-carrying member and the other end connected to the base, each isolation spring extending from the base to the materialcarrying member at an angle with the horizontal of 20 or less, an exciter member, said exciter member being elongated in the direction of the elongation of the material-carrying member and said exciter member having a mass equal to approximately one-half of the mass of the material-carrying member, a plurality of arms suspending the exciter from the material-carrying member, each of said arms having one end pivotally secured to the material-carrying member and the other end pivotally secured to the exciter member, a plurality of force transmitting springs, each of said force transmitting springs having one end secured to the material-carrying member and the other end secured to the exciter member, each force transmitting spring extending upwardly from the exciter member to the materialcarrying member at an angle of from 10 to 200 with the horizontal, a motor mounted on the base, an eccentric shaft rotatably carried by the materialcarrying member, a belt drive connecting the motor to the shaft to rotate the shaft, a crank arm having one and yieldably carried by the eccentric shaft and yieldably secured at its other end to the exciter member.
2. A vibratory conveyor comprising an elongated material-carrying member, a base, a plurality of legs supporting the trough each leg having one end pivotally secured to the material-carrying member and the other end pivotally secured to the base, each leg extending from base to trough at an angle of from 70" to 80" with the horizontal, first isolation spring means secured to the base at each end thereof and mounted to extend horizontally adjacent to but spaced from the end of the material-carrying member, second isolation spring means secured to the base at each end thereof and mounted to extend horizontally adjacent to but spaced from the end of the exciter member, said first isolation spring means having a spring stiffness approximately double the stiffness of the second isolation spring means, an exciter member, said exciter member being elongated in the direction of the elongation of the material-carrying member and said exciter member having a mass equal to approximately one-half of the mass of the material-carrying member, a plurality of arms suspending the exciter from the materialcarrying member, each of said arms having one end pivotally secured to the material-carrying member and the other end pivotally secured to the exciter member, a plurality of force transmitting springs, each of said force transmitting springs having one end secured to the material-carrying member and the other end secured to the exciter member, each force transmitting spring extending upwardly from the exciter member to the material-carrying member at an angle of from 10 to 20 with the horizontal, a motor mounted on the base, an eccentric shaft rotatably carried by the material-carrying member, a belt drive connecting the motor to the shaft to rotate the shaft, a crank arm having one end yieldably carried by the eccentric shaft and yieldably secured at its other end to the exciter member.
3. A vibratory conveyor comprising an elongated material-carrying member, a base, a plurality of legs supporting the trough each leg having one end pivotally secured to the material-carrying member and the other end pivotally secured to the base, each leg extending from base to trough at an angle of from 70" to 80 with the horizontal, first isolation spring means secured to the base at each end thereof and mounted to extend horizontally adjacent but spaced from the end of the material-carrying member, second isolation spring means secured to the base at each end thereof and mounted to extend horizontally adjacent to but spaced from the end of the exciter member, said first isolation spring means having a spring stiffness a approximately double the stiffness of the second isolation spring means, an exciter member, said exciter member being elongated in the direction of the elongation of the material-carrying member and said exciter member having a mass equal to approximately one-half of the mass of the material-carrying member, a plurality of arms suspending the exciter from the materialcarrying member, each of said arms having one end pivotally secured to the material-carrying member and the other end pivotally secured to the exciter member, a plurality of force transmitting springs, each of said force transmitting springs having one end secured to the material-carrying member and the other end secured to the exciter member, each force transmitting spring extending upwardly from the exciter member to the material-carrying member at an angle of from 10 to 200 with the horizontal, a motor mounted on the base, an eccentric shaft rotatably carried by the material-carrying member, a belt drive connecting the motor to the shaft to rotate the shaft, a crank arm having one end yieldably carried by the eccentric shaft and yieldably secured at its other end to the exciter member, said force transmitting springs in combination with the material-carrying member and the exciter member having a predetermined natural frequency and said motor and belt drive being constructed and arranged to rotate said eccentric shaft at a speed near but below said natural frequency.
4. A vibratory conveyor substantially as herein described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US17588380A | 1980-08-06 | 1980-08-06 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2081840A true GB2081840A (en) | 1982-02-24 |
| GB2081840B GB2081840B (en) | 1984-12-19 |
Family
ID=22642050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8038569A Expired GB2081840B (en) | 1980-08-06 | 1980-12-02 | Vibratory conveyor |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB2081840B (en) |
| MX (1) | MX153403A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2188398A (en) * | 1986-03-19 | 1987-09-30 | Robin Desmond Radcliff Andrews | Improvements relating to vibratory machines |
| WO2005025761A1 (en) * | 2003-09-17 | 2005-03-24 | Heat And Control, Inc. | Vibratory conveyor |
| GB2414004A (en) * | 2004-05-11 | 2005-11-16 | Tna Australia Pty Ltd | Slip conveyor having vertical acceleration less than gravity |
| CN110065769A (en) * | 2019-05-27 | 2019-07-30 | 无锡锡西模锻有限公司 | A kind of transfer transfer device of blank after high-temperature heating |
-
1980
- 1980-12-02 GB GB8038569A patent/GB2081840B/en not_active Expired
-
1981
- 1981-08-06 MX MX18863081A patent/MX153403A/en unknown
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2188398A (en) * | 1986-03-19 | 1987-09-30 | Robin Desmond Radcliff Andrews | Improvements relating to vibratory machines |
| GB2188398B (en) * | 1986-03-19 | 1989-12-28 | Robin Desmond Radcliff Andrews | Improvements relating to vibratory machines |
| WO2005025761A1 (en) * | 2003-09-17 | 2005-03-24 | Heat And Control, Inc. | Vibratory conveyor |
| GB2414004A (en) * | 2004-05-11 | 2005-11-16 | Tna Australia Pty Ltd | Slip conveyor having vertical acceleration less than gravity |
| CN110065769A (en) * | 2019-05-27 | 2019-07-30 | 无锡锡西模锻有限公司 | A kind of transfer transfer device of blank after high-temperature heating |
Also Published As
| Publication number | Publication date |
|---|---|
| MX153403A (en) | 1986-10-07 |
| GB2081840B (en) | 1984-12-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19931202 |