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Effective date : Year of fee payment : 4. Year of fee payment : 8. Year of fee payment : A vibratory conveying apparatus embodying the principles of the present invention includes a base, a trough, and at least one spring assembly mounting the trough on the base for vibratory conveyance of material in the trough. At least one of the spring assemblies of the conveying apparatus is configured for selective adjustment of the spring rate of the assembly, so that the conveying apparatus can be efficiently tuned for conveying different types of materials, without resort to varying the air gap of the associated electromagnetic vibratory drive, or by otherwise altering spring rates or weight ratios of the conveying apparatus.
Vibratory conveying devices are employed in a wide variety of material-handling applications, such as for handling food products, particulate material, small parts, and other applications which do not lend themselves to use of belt-type conveyors. These types of conveying devices operate by creating vibratory motion in a bed-like conveyor trough, either by operation of mechanical or electromagnetic drives. In a typical vibratory conveyor having an electromagnetic drive, one or more spring assemblies, typically comprising leaf springs, operatively support the vibrating trough of the device on an associated base which typically houses the electromagnetic drive.
Reciprocating, vibratory motion is imparted to the trough by the electromagnetic drive, with the one or more spring assemblies of the device arranged to permit angular, vibratory movement of the trough.
In this manner, material in the trough is conveyed as it is moved angularly upwardly during movement of the trough by the vibratory drive, with the trough then moved rearwardly beneath the material. Several factors typically affect the vibrational operation of this type of conveying apparatus.
While the above techniques are well-known for tuning a vibratory conveying apparatus for optimal conveying efficiency, adjustment of weight ratios, air gaps, and spring rates have heretofore typically required that components of the apparatus be adjusted or altered, detracting from efficient tuning.
Additionally, tuning techniques typically employed heretofore frequently require that a conveyor be especially configured for a given application, thus detracting from efficient manufacture of conveyors for varying applications. The present invention contemplates an arrangement to facilitate efficient tuning of a vibratory conveyor by providing at least one adjustable spring assembly operatively connecting the base of the conveyor with an associated vibratory trough.
A vibratory conveying apparatus embodying the principles of the present invention is configured to include at least one adjustable spring assembly operatively connecting a base of the conveyor with the associated feed trough.
By this arrangement, the effective spring rate of the adjustable spring assembly can be selectively varied, which permits efficient adjustment of the operational characteristics of the conveyor, including the conveyor stroke, without variation in the associated electromagnetic drive of the conveyor. This facilitates use of the conveyor for conveying differing types of material, and can even accommodate adjustment of the conveyor’s operating characteristics for accommodating variations in the frequency of the power supplied to the electromagnetic drive of the conveyor.
In accordance with the illustrated embodiment, a vibratory conveying apparatus embodying the principles of the present invention includes a base, and a trough, and at least one spring assembly which mounts the trough on the base for vibratory conveyance of material in the trough. An adjustable spring assembly in accordance with the present invention can be provided in a variety of configurations, with each configuration facilitating use with conventionally structured vibratory conveying devices.
In the illustrated embodiments, the adjustable spring assembly includes a lower arm connected to the base of the conveying apparatus, and an upper arm connected to the trough of the device.
An adjustable spring element mounted between the upper and lower arms can be adjusted to selectively vary the spring rate of the adjustable spring assembly, thereby altering the vibratory characteristics of the trough, without adjustment of the associated electromagnetic drive. Use of an adjustable compression spring is presently preferred, with illustrated embodiments including an elastomeric compression spring and a coil compression spring. In certain embodiments, the adjustable spring assembly of the present invention includes a stack of leaf springs, with the adjustable compression spring of the assembly positioned on one side of the leaf spring stack.
In other embodiments, the adjustable spring assembly includes a pair of leaf springs, with the adjustable compression spring positioned between the pair of leaf springs. In the illustrated embodiments, the trough of the conveying apparatus is mounted and supported by a pair of spring assemblies, with one of the assemblies being positioned proximally of the electromagnetic vibratory drive, and the other of the assemblies being positioned distally of the vibratory drive.
In accordance with the present invention, the adjustable spring assembly can be positioned proximally of the drive, or distally of the drive.
In a further embodiment, each of the illustrated pair of leaf spring assemblies is non-adjustable, with an adjustable spring assembly positioned between an upwardly facing surface of the conveyor base, and a generally rearwardly facing side wall of the conveyor trough. Other features and advantages of the present invention will become readily apparent from the following detailed description, the accompanying drawings, and the appended claims. While the present invention is susceptible of embodiment in various forms, there is shown in the drawings, and will hereinafter be described, presently preferred embodiments, with the understanding that the present disclosure is to be considered as an exemplification of the invention, and is not intended to limit the invention to the specific embodiments illustrated.
The present invention is directed to a vibratory conveying apparatus, sometimes referred to as a vibratory feeder, which includes a spring mounting system including at least one adjustable spring. In certain embodiments, the adjustable spring system desirably acts to decrease the deceleration time of the vibratory trough of the apparatus, which desirably acts to terminate vibratory movement, and thus material conveyance, more quickly than conventional arrangements.
By changing the effective spring rate contained in a tuned vibratory machine, the present invention facilitates cost-effective use by avoiding the need to provide an adjustable air gap for the vibratory drive of the device. This desirably acts to lower manufacturing costs, and additionally greatly simplifies the tuning process in end-user installations. Because air gaps may be fixed, it is possible to maintain a relatively constant current, and thus operate with the lowest possible power consumption.
As will be described, spring rate adjustment can be effected without disassembly, and with minimal or no use of tools, depending on the specific application. With reference to FIG. The conveying apparatus includes a base 12 which houses an electromagnetic drive 14 which induces a vibratory i. In order to permit vibratory movement of the conveying trough 16 , the trough is mounted on the base 12 by at least one spring assembly which supports the trough for vibratory conveyance of material therein.
In accordance with the present invention, the illustrated embodiment includes a non-adjustable spring assembly 20 , and an adjustable spring assembly In this illustrated embodiment, each of the spring assemblies 20 , 22 includes a plurality of leaf springs 24 arranged in a stack.
Leaf springs 24 are typically formed from fiberglass, and may be separated by suitable spring spacers, typically formed from phenolic resin. Each spring assembly 20 , 22 is respectively connected to the trough bracket 18 and the base 12 of the conveying apparatus by suitable threaded mechanical fasteners.
By the angular orientation of the spring assemblies 20 , 22 , vibratory motion in the conveying trough 16 is induced at an acute angle typically 20 degrees to the generally horizontal base of the trough. By this arrangement, material is conveyed by inducing motion both horizontally and vertically, with material thereby being conveyed along the trough, generally away from the base 12 , referring to the orientation of the illustrated embodiment. With particular reference to FIG.
In particular, the adjustable spring assembly 22 includes an elastomeric compression spring 26 held in captive relationship between a lower arm 28 connected to the base 12 , and an upper arm 30 connected to the trough 16 via trough bracket The spring assembly 22 includes an adjustment mechanism which, in the illustrated embodiment, comprises a threaded adjustment element 32 which extends through the lower arm 28 for selectively compressing elastomeric spring 26 , and thus effectively altering the spring rate of the spring 26 , and the spring rate of the adjustable spring assembly As will be recognized, the illustrated embodiment of conveying apparatus includes a pair of leaf spring assemblies 20 , 22 , with one of the assemblies being positioned proximally of the vibratory drive 14 , and the other of the assemblies being positioned distally of the vibratory drive.
In the embodiment illustrated in FIG. In contrast, the embodiment of the present invention illustrated in FIG. With reference now to FIG. Adjustable spring assembly is configured similarly to previously-described adjustable spring assembly 22 , but with spring assembly including a coil compression spring held captive between lower arm 28 and upper arm 30 , with a threaded adjustment member 32 providing for selective adjustment of the compression coil spring by compressing the spring.
With reference now to FIGS. In this embodiment, adjustable spring assembly is positioned distally of the associated conveyor drive 14 , and includes an arrangement of cooperating leaf springs and an elastomeric compression spring.
The adjustable spring assembly further includes an elastomeric compression spring positioned between leaf springs , with spring held in captive relationship between a lower arm and an upper arm respectively connected to the base 12 and the bracket 18 of the conveyor trough. A threaded adjustment member , with a suitable locking nut , is provided for selectively compressing and varying the effective spring rate of the elastomeric compression spring , thereby selectively varying the effective spring rate of the adjustable spring assembly The embodiment of the present conveying apparatus 10 illustrated in FIG.
In this embodiment, an elastomeric compression spring is held in captive relationship between a lower arm , connected to an upwardly facing surface of base 12 , and an upper arm connected to a generally rearwardly facing sidewall of the trough A threaded adjustment member , secured with a suitable locking nut , acts to selectively compress and thus vary the spring rate of the elastomeric compression spring , thus varying the effective spring rate of the adjustable spring assembly As will be appreciated from the foregoing description, a vibratory conveying apparatus embodying the principles of the present invention can be provided in any of a variety of configurations, with an adjustable spring assembly of the apparatus being configured and positioned as may be required for various specific applications.
As will be appreciated, while the present invention has been illustrated in connection with a so-called linear conveying apparatus or vibratory feeder, it is within the purview of the present invention that the conveying apparatus including an adjustable spring assembly can be configured as a rotary vibratory feeder. The adjustable spring of the adjustable spring assembly of the apparatus may be constructed of varying materials that may have spring rates that are linear of nonlinear, as may be required.
The adjustable spring may be designed to be compatible with a wide range of applications, such as high-temperature applications, corrosive environments, and those environments configured in accordance with Food and Drug Administration requirements for food handling and the like. From the foregoing, it will be observed that numerous modifications and variations can be effected without departing from the true spirit and scope of the novel concept of the present invention.
It is to be understood that no limitation with respect to the specific embodiments illustrated herein is intended or should be inferred. The disclosure is intended to cover, by the appended claims, all such modifications as fall within the scope of the claims. What is claimed is: 1. A vibratory conveying apparatus, comprising:. A vibratory conveying apparatus in accordance with claim 1 , wherein:. A vibratory conveying apparatus in accordance with claim 5 , wherein:. A vibratory conveying apparatus in accordance with claim 6 , wherein:.
A vibratory conveying apparatus in accordance with claim 5 , wherein: said one of said spring assemblies further comprises a plurality of leaf springs. A vibratory conveying apparatus in accordance with claim 9 , wherein:.
A vibratory conveying apparatus in accordance with claim 12 , wherein:. A vibratory conveying apparatus in accordance with claim 13 , wherein:. USB1 en. JPB2 en. ESB2 en. GBB en. WOA1 en. Apparatus and system for controlling the operating frequency of an electromagnetic vibratory feeder at a submultiple of the power line frequency.
ESA1 en. GBA en. JPA en. GBD0 en. AUA1 en. USB2 en. JPB1 en. EPB1 en. USA en. AUB2 en. USA1 en. CNA en. CNU en. SUA1 en.