FEED PLATE AND BEAM STABILIZER FOR A GRANULAR MATERIAL WEIGHING SYSTEM

Abstract

The feed plate and beam stabilizer for a granular material weighing system are components used with granular material weighing systems, such as those used for filling cartridges with gunpowder. The feed plate is a circular plate disposed within a hopper of a granular material trickler. The circular plate is spaced apart from the bottom of the hopper by a plurality of substantially L-shaped members, which are used to impart movement to granular material contained in the granular material trickler when the circular plate is driven to rotate. The beam stabilizer includes a stabilizing wire connected to a lever arm for selectively contacting a beam of a beam balance of a granular material weighing system. The stabilizing wire makes contact with the beam to provide additional dampening to the beam to cease oscillation thereof following discharge of granular material into the weighing pan of the granular material weighing system.

Claims

1. A beam stabilizer for a beam balance, comprising: a vertical support having opposed upper and lower ends, the lower end being adapted for mounting on a support surface; a lever having at least one pivoting arm having opposed first and second ends and a central portion pivotally attached to the upper end of the vertical support; a stabilizing wire having opposed first and second ends, the first end being adapted for selectively contacting and stabilizing a beam of a beam balance, the second end extending from the first end of the at least one pivoting arm; and an actuating rod selectively applying a downward force to the second end of the at least one pivoting arm; wherein the downward force applied by the actuating rod on the second end of the at least one pivoting arm raises the stabilizing wire so that the beam is free to pivot and removal of the downward force applied by the actuating rod permits the stabilizing rod to fall against the beam by gravity, thereby dampening oscillations.

2. The beam stabilizer according to claim 1, wherein said lever comprises a dual-arm lever, said at least one pivoting arm including: a first pivoting arm having opposed first and second ends and a central portion pivotally attached to the upper end of the vertical support, the downward force applied by the actuating rod being selectively applied to the second end of the first pivoting arm; upper and lower pins projecting laterally from the first end of the first pivoting arm; and a second pivoting arm having opposed first and second ends, the second end of the second pivoting arm being pivotally attached to the upper end of the vertical support, the second end of said stabilizer wire extending from the first end of the second pivoting arm, the stabilizing wire extending between the upper and lower pins of the first pivoting arm; wherein the downward force applied by the actuating rod on the second end of the first pivoting arm rotates the first end of the first pivoting arm upward about the upper end of the vertical support so that the lower pin bears against and lifts the stabilizing wire out of contact with the beam of the beam balance, and removal of the actuating rod from the second end of the first pivoting arm rotates the first end of the first pivoting arm downward under its own weight so that the upper pin bears against the stabilizing wire and drops the stabilizing wire into contact with the beam of the beam balance to dampen oscillation of the beam.

3. The beam stabilizer as recited in claim 2, wherein the beam balance is incorporated into a volumetric weighing system, said actuating rod being synchronized with a volumetric dispensing system feeding volumetric charges onto the beam balance.

4. A granular material weighing system, comprising: a beam balance having a beam, a damping mechanism, and a weighing pan, the weighing pan having means for selectively containing and selectively dispensing a granular material; a volumetric measure having a hopper, an outlet and an actuating member, the actuating member selectively transferring the granular material from the hopper to the outlet and discharging the granular material onto the weighing pan of the beam balance; a granular material trickler for selectively dispensing an auxiliary volume of the granular material into the weighing pan, the granular material trickler having: an auxiliary hopper having a bottom and an opening defined in the bottom; a rotating feed plate disposed in the auxiliary hopper and rotatably mounted above the bottom of the auxiliary hopper, the rotating feed plate being a circular plate defining a periphery and having opposed upper and lower surfaces and a central annular hub, the circular plate further having a plurality of slots defined therein, the rotating feed plate having a plurality of substantially L-shaped members depending from the periphery of the circular plate, the circular plate being spaced apart from the bottom of the auxiliary hopper by the plurality of substantially L-shaped members; and a feed barrel having opposed first and second ends, the first end being in open communication with the opening defined in the bottom of the auxiliary hopper, the second end being adapted for dispensing the auxiliary volume of the granular material into the weighing pan; and a beam stabilizer including: a lever having at least one pivoting arm having opposed first and second ends; a stabilizing wire having opposed first and second ends, the first end of the stabilizing wire being adapted for selectively contacting and stabilizing the beam of the beam balance, the second end extending from the first end of the at least one pivoting arm; and an actuating rod selectively applying a downward force to the second end of the at least one pivoting arm.

5. The granular material weighing system as recited in claim 4, wherein said lever comprises a dual-arm lever, the beam stabilizer including a vertical support having an upper end, the at least one pivoting arm including: a first pivoting arm having a first end, an opposing second end, a central portion pivotally attached to the upper end of the vertical support, and upper and lower pins projecting laterally from the first end of the first pivoting arm, the downward force applied by the actuating rod being selectively applied to the second end of the first pivoting arm; and a second pivoting arm having a first end and an opposing second end, the second end of the second pivoting arm being pivotally attached to the upper end of the vertical support, the second end of the stabilizing wire extending from the first end of the second pivoting arm, the stabilizing wire extending between the upper and lower pins of the first pivoting arm; wherein the downward force applied by the actuating rod on the second end of the first pivoting arm rotates the first end of the first pivoting arm upward about the upper end of the vertical support so that the lower pin bears against and lifts the stabilizing wire out of contact with the beam of the beam balance, and removal of the actuating rod from the second end of the first pivoting arm rotates the first end of the first pivoting arm downward under its own weight so that the upper pin bears against the stabilizing wire and drops the stabilizing wire into contact with the beam of the beam balance to dampen oscillation of the beam.

6. The granular material weighing system as recited in claim 5, wherein the rotating feed plate has a plurality of substantially L-shaped members depending from the periphery of the circular plate, the circular plate being spaced apart from the bottom of the auxiliary hopper by the plurality of substantially L-shaped members.

7. The granular material weighing system as recited in claim 6, wherein the feed plate further comprises: a pair of prongs projecting axially from the upper surface of the circular plate; and a radially extending groove formed in the upper surface of the circular plate.

8. The granular material weighing system as recited in claim 4, wherein the rotating feed plate has a plurality of substantially L-shaped members depending from the periphery of the circular plate, the circular plate being spaced apart from the bottom of the auxiliary hopper by the plurality of substantially L-shaped members.

9. The granular material weighing system as recited in claim 8, wherein the feed plate further comprises a pair of prongs projecting axially from the upper surface of the circular plate.

10. The granular material weighing system as recited in claim 9, wherein the upper surface of the circular plate of the feed plate includes texturing thereon.

11. The granular material weighing system as recited in claim 10, wherein the texturing comprises a radially extending groove formed in the upper surface of the circular plate.

12. A feed plate, comprising: a circular plate having opposed upper and lower surfaces, the circular plate defining a periphery and having a central annular hub adapted for mounting on a rotating shaft of a hopper, the circular plate having a plurality of slots formed therein; and a plurality of substantially L-shaped members depending from the lower surface at the periphery of the circular plate. the circular plate being adapted for mounting within the hopper and to be rotated near a bottom of the hopper, the circular plate being spaced apart from the bottom of the hopper by the plurality of substantially L-shaped members.

13. The feed plate as recited in claim 12, further comprising a pair of prongs projecting axially from the upper surface of the circular plate.

14. The feed plate as recited in claim 12, wherein the upper surface of the circular plate includes texturing thereon.

15. The feed plate as recited in claim 14, wherein the texturing comprises a radially extending groove formed in the upper surface of the circular plate.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG. 1A is a bottom perspective view of a feed plate for a granular material weighing system.

[0019] FIG. 1B is a top perspective view of the feed plate of FIG. 1A.

[0020] FIG. 2 is a perspective view of a prior art granular material weighing system.

[0021] FIG. 3A is a top view of a prior art feed plate for use with the granular material weighing system of FIG. 2.

[0022] FIG. 3B is a top view of an alternative embodiment of a prior art feed plate for use with the granular material weighing system of FIG. 2.

[0023] FIG. 4 is a partial side view in section of a prior art trickler for use with the granular material weighing system of FIG. 2.

[0024] FIG. 5 is a partial environmental side view in section of the feed plate of FIGS. 1A and 1B installed in a trickler of a granular material weighing system, the optional prongs being omitted from the feed plate.

[0025] FIG. 6 is an environmental perspective view of a beam stabilizer for a granular material weighing system, shown with an actuating rod moving downward to contact one end of a lever arm.

[0026] FIG. 7 is an environmental perspective view of the beam stabilizer of FIG. 6, shown with the actuating rod contacting and imparting a downward force to one end of the lever arm.

[0027] FIG. 8 is an environmental perspective view of the beam stabilizer of FIG. 6, shown with the actuating rod continuing to contact and impart downward force to one end of the lever arm.

[0028] FIG. 9 is an environmental perspective view of the beam stabilizer of FIG. 6, shown with the actuating rod moving upward and out of contact with the lever arm.

[0029] Similar reference characters denote corresponding features consistently throughout the attached drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] Referring now to FIGS. 1A and 1B, the feed plate for a granular material weighing system, designated generally as 10 in the drawings, is a rotating feed plate for use with a trickier of the granular material weighing system. For example, the feed plate 10 may be used with the trickier 180 of FIG. 2, although it should be understood that the term trickier, as used herein, refers to a device that gradually feeds granular parts or pieces onto a scale to bring the mass of a volumetric sample up to the precise targeted mass, the trickier typically including a rotating feed plate placed near the bottom of the trickler's hopper.

[0031] The feed plate for a granular material weighing system 10 includes a circular plate 12 having opposed upper and lower surfaces 22, 24, respectively, and further having a central annular hub 16 adapted for mounting to a rotating shaft of the granular material trickier. FIG. 5 illustrates the feed plate 10 mounted within the hopper 182 of the trickier 180, although it should be understood that the feed plate 10 may be used with any suitable type of trickier or similar feeding or dispensing device. As shown, the feed plate 10 is mounted on the shaft 188 of a motor 170 through interconnection the shaft 188 with the central annular hub 16.

[0032] The circular plate 12 has a plurality of slots 14 formed therein. It should be understood that the number, shape and relative dimensions of slots 14 are shown in FIGS. 1A and 1B for exemplary purposes only. Further, as shown in FIG. 1B, optionally a pair of prongs 20 may project axially from the upper surface 22 of circular plate 12. Similar to a conventional rotating feed plate, the prongs 20 provide a gripping surface for connection and adjustment of the feed plate 10, as well as providing mixing and distributing functions for granular material received on the upper surface 22 of the circular plate 12 (prior to the granular material falling through the slots 14). Additionally, texturing may be added to the upper surface 22 to urge movement of the granular material such that it falls through the slots 14. A radially extending groove 18 may be formed in the upper surface 22, although it should be understood that any suitable type of texturing may be used.

[0033] As shown in FIG. 1A, a plurality of substantially L-shaped members 26 depend from the lower surface 24 of the circular plate 12. As shown in FIG. 5, the circular plate 12 is disposed within the hopper 182 of the granular material trickler and is rotatably mounted near the bottom 174 of the hopper 182. The circular plate 12 is spaced apart from the bottom 174 of the hopper 182 by the plurality of substantially L-shaped members 26. Thus, in contrast to a conventional rotating feed plate for tricklers, such as the feed plate 202a shown in FIG. 4, in which granular material contained within the hopper 182 rides on the top surface of the feed plate 202a until falling through slots 204a and 172 for dispensing, the feed plate 10 allows the granular material to initially fall through the slots 14 to be contained between the circular plate 12 and the bottom 174 of the hopper 182. As shown in FIG. 5, the hopper 182 may be angled with respect to the horizontal, allowing the plurality of substantially L-shaped members 26 to impart rotating movement to the granular material for dispensing thereof by carrying the granular material to the opening 172 in the bottom 174 of the hopper 182. By containing the granular material between the circular plate 12 and the bottom 174 of the hopper 182 after the granular material falls through the relatively wide slots 14, the feed plate 10 allows for the effective dispensing of granular material that is not necessarily uniform and regularly shaped.

[0034] Although the feed plate 10 has been described in particular detail for use with a granular weighing system, and especially for use in a trickler of a weighing system that starts with a volumetric sample that is intentionally less than the final desired mass so that the trickier gradually adds additional material to bring the final mass up to the target mass, it will be understood that the feed plate 10 may be used in other applications in manufacturing or automated processing equipment having a hopper with a rotating feed plate for adding additional powder or granulated material during operation. An example of such an application may be in the plastics industry, where an initial volume of plastic resin may be added to an extruder or injection molding machine and a hopper with a rotating feed plate may be used to add additional resin to bring the quantity of resin up to the precise level needed for extrusion or molding of a plastic part to specification. Other applications will be readily apparent to those of ordinary skill in the manufacturing arts.

[0035] As shown in FIGS. 6-9, the beam stabilizer for the granular material weighing system 200 provides a gentle stabilizing force to the beam of a beam balance, such as beam 108 of beam balance 102 of the granular material weighing system 100 of FIG. 2. However, it should be understood that the beam stabilizer 200 may be used in combination with any suitable type of beam balance to provide additional dampening. In the example of beam balance 102 of the granular material weighing system 100 of FIG. 2, this additional dampening is used to cease the oscillatory movement of beam 108 when a volumetric charge is dispensed into the weighing pan 106 from volumetric container 158.

[0036] The beam stabilizer 200 may be in the form of a lever arm having opposed first and second ends. The first end 222 of a stabilizing wire 220 is adapted for selectively contacting and stabilizing the beam 108 of beam balance 102. The second end 224 of the stabilizing wire 220 is mounted on the first end of the lever arm. An actuating rod 230 selectively applies a downward force to the second end of the lever arm. In the example of the granular material weighing system 100, the upper end of the actuating rod 230 may be rotatably attached to rotary drum 106 of FIG. 3 of U.S. Pat. No. 6,121,556, cited above, such that when the volumetric charge is dispensed into the weighing pan 106 from volumetric container 158, the actuating rod 230 is in its raised position, as shown in FIG. 6.

[0037] As shown in FIGS. 6-9, in order to better govern the movement and control of the stabilizing wire 220, the lever arm may be a dual-arm lever, including first and second pivoting arms 204, 214, respectively, mounted on a common axle on a single common vertical support 202. A lower end of the vertical support 202 is mounted on a support surface, such as the stand 112 of the beam balance 102. A central portion 209 of the first pivoting arm 204 is pivotally attached to the upper end of the vertical support 202. Upper and lower pins 210, 212 project from a first end 206 of the first pivoting arm 204.

[0038] A second end 224 of the stabilizing wire 220 is mounted on a first end 216 of the second pivoting arm 214 such that the stabilizing wire 220 extends between the upper and lower pins 210, 212 of the first pivoting arm 204. A second end 218 of the second pivoting arm 214 is pivotally attached to the upper end of the vertical support 202 and pivots freely and independently of the first pivoting arm 204.

[0039] In FIG. 6, an actuating rod 230 is shown moving downward towards the second end 208 of the first pivoting arm 204. In FIG. 7, the actuating rod 230 contacts the second end 208, selectively applying a downward force to the second end 208 of the first pivoting arm 204. This clockwise torque (in the orientation of FIG. 7) causes the first end 206 of the first pivoting arm 204 to rotate upward about the upper end of the vertical support 202. The upward rotation of the first end 206 of the first pivoting arm 204 brings the lower pin 212 into contact with the stabilizing wire 220 to lift the stabilizing wire 220 out of contact with the beam 108, as shown in FIG. 8. As shown in FIG. 9, removal of the actuating rod 230 from the second end 208 of first pivoting arm 204 causes the first end 206 of the first pivoting arm 204 to rotate downward about the upper end of the vertical support 202 under its own weight, i.e., under the force of gravity, the first pivoting arm 204 begins to rotate counterclockwise (in the orientation of FIG. 9). The downward rotation of the first end 206 of first pivoting arm 204 brings the upper pin 210 into contact with the stabilizing wire 220 to drop the stabilizing wire 220 to contact the beam 108 to provide the stabilizing damping force thereto.

[0040] In practice, during automatic operation, photocells directed at the weighing pan 106 or the beam 108 control activation of the trickler 180. When the volumetric charge is dispensed onto the weighing pan, the beam 108 tends to oscillate briefly due to the weight falling on the pan. When the beam stops oscillating, the photocell(s) can read its position and determine that the volumetric charge is less than the targeted charge mass. The signal from the photocell then adds additional charge to bring the mass on the weighing pan up to the targeted charge mass. The purpose of the stabilizer is to hold down the back end of the beam briefly (perhaps a second) as the volumetric charge hits the weighing pan so that the photocell can read the beam's position and activate the trickler to dispense more charge without waiting for the oscillations to stabilize. Hence, the weighing cycle per cartridge becomes somewhat faster and more efficient. The actuating rod 230 is connected to the volumetric charge mechanism such that the stabilizer wire holds down the back end of the beam when the volumetric charge is dispensed and is lifted off the beam when a new volumetric charge is to be dispensed.

[0041] It is to be understood that the feed plate and beam stabilizer for a granular material weighing system is not limited to the specific embodiments described above, but encompasses any and all embodiments within the scope of the generic language of the following claims enabled by the embodiments described herein, or otherwise shown in the drawings or described above in terms sufficient to enable one of ordinary skill in the art to make and use the claimed subject matter.