WO2001081177A1

WO2001081177A1 - Bag closing apparatus

Info

Publication number: WO2001081177A1
Application number: PCT/US2001/013352
Authority: WO
Inventors: Keith W. Sterner; Dennis E. Graham; John F. Simonof, Jr.; David R. Gill
Original assignee: Flexicon Corporation
Priority date: 2000-04-26
Filing date: 2001-04-26
Publication date: 2001-11-01
Also published as: NZ522149A; US7032875B2; AU2001257260B2; US20040000122A1; CA2406221A1; DE60103996T2; ES2222994T3; DE60103996D1; EP1276669B1; ATE269810T1; AU5726001A; US6892510B2; CA2406221C; DK1276669T3; EP1276669A1; US6502367B1; US20050218358A1

Abstract

A bag closing apparatus including a frame structure, a cinching assembly (60) and an actuator assembly (80). The cinching assembly includes at least three pivot arms (72), each pivot arm including an arcuate portion and pivotably connected to the frame structure. The pivot arms are located relative to each to define a confined closure area. The actuator assembly includes a plurality of actuators for moving the pivot arms between spread positions and closed positions wherein the closure area has a smaller area.

Description

BAG CLOSING APPARATUS

BACKGROUND

The present invention relates to the unloading of bulk bags used as containers

for dry or moist particulate materials. The present invention more particularly relates

to the unloading of bulk bag containers fabricated from cloth like material, such as

woven polyester material, which is usually sewn in a cubical configuration.

Bulk bags made of heavy cloth material have been known in the art for

sometime. It has also been known to provide the bag with heavy corner straps which

support the bag when it is hung in a tower like support frame. The opposite end of

the bag typically has a central outlet spout which is aligned with a discharge unit, for

example a conveyer, hopper or the like, into which the material in the bag is intended

to be discharged. Prior to discharge, the spout is maintained in a closed position,

typically by tying-off of the spout.

To discharge the bag, the bag is hung in the support frame and the spout

engaged with the discharge unit. The spout is opened and the particulate material

flows via gravity through the spout. It is often desirable to control flow of material

from the spout, for example, to permit batch weighing or to permit re-tying of the

bag. Various types of bag closing devices, examples of which are illustrated in

Figures 1-3, have been employed. In the device of Figure 1, opposed bars, either flat

or cylindrical, are moved together by fluid cylinders. As the spout is closed, it

flattens in the direction of the arrows in Figure 1. As a result, the flattened, wide

spout is difficult to re-tie, particular if the spout is short. The device of Figure 2 attempts to overcome such by providing substantially v-shaped opposed bars, as

described in U.S. Patent No. 5,787,689. However, at the two points of overlap

between the opposed bars, the bag is susceptible to pinching which may cut the bag

or the bag may roll out between the overlapped bars. Referring to Figure 3, a "claw"

like device is shown. The bag is again susceptible to pinching in such a device.

Additionally, in some applications, for example where the particulate material is

dense, a significant amount of torque is required to closed the opposed claw

members.

Accordingly, there is a need for an apparatus which assists in restricting a bag

spout while reducing the likelihood of pinching of the spout.

SUMMARY

The present invention provides a bag closing apparatus including a frame

structure, a cinching assembly and an actuator assembly. The cinching assembly

includes at least three pivot arms, each pivot arm including an arcuate portion and

pivotably connected to the frame structure. The pivot arms are located relative to

each other such that each pivot arm crosses at least two other pivot arms to define a

confined closure area. The actuator assembly includes a plurality of actuators for

moving the pivot arms between spread positions wherein the closure area has a

predetermined area and closed positions wherein the closure area has a smaller area. BRIEF DESCRIPTION OF THE DRAWING(S)

Figures 1-3 are top plan views of prior art bag closing devices.

Figure 4 is a top plan view of the preferred embodiment of the present

invention.

Figure 5 is a cross-sectional view of the housing of the preferred embodiment

of the present invention.

Figure 6 is an exploded view of the housing of the preferred embodiment of

the present invention.

Figure 7 is a top plan view of a pivot arm assembly of the preferred

embodiment of the present invention.

Figure 8 is a side elevation view of a portion of the pivot arm assembly along

the line 8-8 in Figure 7.

Figure 9 is a cross-sectional view along the line 9-9 in Figure 4.

Figure 10 is a cross-sectional view along the line 10-10 in Figure 4.

Figure 11 is a cross-sectional view along the line 11-11 in Figure 4.

Figures 12-14 are top plan views illustrating the cinching sequence of the

cinching assembly of the preferred embodiment of the present invention.

Figure 15 is a flow diagram of the preferred operating system of the present

invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

The preferred embodiment of the present invention will be described with

reference to the -drawing figures where like numerals represent like elements

throughout.

Referring to Figures 4-11, the preferred embodiment 10 of the present

invention is shown. The bag closing apparatus 10 comprises a housing 20 and a

cinching assembly 60. Referring to Figures 5 and 6, the preferred housing 20

includes a split cylindrical body 30 secured between round top and bottom plates 24

and 40. The plates have coaxial apertures 26 and 42 such that a cylindrical path 32

extends through the housing 20. A plurality of mounting brackets 44 extend from

the cylindrical body 30 for mounting the apparatus 10 on a frame (not shown) or

other discharge unit (not shown). The body 30, plates 24, 40 and brackets 44 are

preferably manufactured from sheet metal of approximately 10 or 12 gauge.

A pair of cylinder mounting boxes 34 are secured to the housing 20 in

alignment with the open areas 31 of the split housing body 30. Each box 34 has a

mounting plate 36 with an aperture 38 extending therethrough. As will be described

in more detail hereinafter, a fluid cylinder 81 is mounted to each mounting plate 36

with its piston rod 82 aligned with the respective aperture 38. The boxes 34 are

preferably manufactured from 14 gauge sheet metal and the plates 36 from one-

quarter inch (VX) steel bar. The top and bottom plates 24,40, the body 30, the brackets 44, the boxes 34, and the mounting plates 36 are preferably welded together,

but may be secured by other means.

A support ring 52 is preferably secured to the bottom plate 40 by a plurality

of flanges 54 extending therefrom. The support ring 52 is preferably manufactured

from a half inch (VX) steel rod and finished smooth on its upper surface. The support

ring 52 provides support and a smooth guide surface for the pivot arms 72 as will be

described in more detail hereinafter. A ring 28 depends from the top plate 24 about

the aperture 26. The ring 28 also provides a smooth guide surface for the pivot arms

72 as will be described in more detail hereinafter.

A removable support plate 48 with an aperture 50 therethrough may be

attached to the top plate 24 with the apertures 50 and 26 coaxially aligned. The

support plate aperture 50 is preferably sized to the dimension of the bag spout, i.e.,

if the spout has a sixteen inch (16") diameter, the support plate aperture 50 will have

a slightly oversized diameter. The support plate 48 thereby helps prevent sagging of

the bag portion into the closing apparatus 10. If a different size spout is used, the

support plate 48 can be interchanged. An apertured guard 56 may be secured to the

bottom plate 40 to help prevent unwanted objects from entering the apparatus 10.

The support plate 48 and the guard 56 are preferably manufactured from one-quarter

inch (VX) high density polyethylene.

The cinching assembly 60 will be described with reference to Figures 7-11.

The preferred cinching assembly 60 comprises four pivot arm assemblies 70 and a pair of actuator assemblies 80, although fewer or more of each may be utilized.

Referring to Figures 7 and 8, each pivot arm assembly 70 includes a substantially J-

shaped pivot arm 72 extending from a pivot tube 76. The pivot arms 72 are

preferably manufactured from half inch (VX) steel rod and may be provided with a

tapered tip. A link tab 74 extends from each pivot arm 72 for interconnection with

a respective actuator assembly 80. Each pivot tube 76 includes a hollow body 77

upon which a respective pivot arm 72 is mounted. A shaft 78 extends through the

hollow body 77 and is pivotably secured with respect to the top and bottom plates

24, 40. Bushings 79 or the like may be utilized about the shaft 78.

The preferred actuator assemblies 80 include fluid actuated cylinders 81 in

communication with an air supply line or the like (not shown). A piston rod 82

extends from the cylinder 81 and is connected to an attachment plate 84. A pair of

link bars 88, one above and one below, are pivotably connected to the attachment

plate 84 via a pin 86 or the like. The opposite ends of the link bars 88 are then

pivotably connected to a link tab 74 extending from a respective pivot arm 72. By

securing one link bar 88 above and one below the attachment plate 84, the link bars

88 properly align with the link tabs 74 of the pivot arms 72 which are at different

elevations. Alternatively, one actuator assembly 80 may be utilized for each pivot

arm assembly 70.

Referring to Figures 9-11, the four pivot arms 72a- 72d are stacked one upon

the other and upon the support ring 52. The support ring 52 and top ring 28 are preferably spaced such that the pivot arms 72a-72d abut, as shown in Figure 10, but

remain slidable relative to one another. The abutting relationship helps prevent the

spout from moving between adjacent pivot arms 72. Referring to Figure 11, the

pivot arms 72a-72d are mounted at different heights on their respective pivot tubes

76 to provide proper alignment. Additionally, to provide proper alignment of the

fluid actuated cylinders 81, such are preferably mounted off-set from one another.

As shown in Figure 9, the higher mounted cylinder 81 actuates pivot arms 72a and

72c and the lower mounted air cylinder 81 actuates pivot arms 72b and 72d.

The cinching sequence will now be described with reference to Figures 12-14.

Referring to Figure 12, the actuator assemblies 80 are non-energized and the pivot

arms 72 are in an open, generally circular configuration. In this configuration, a

spout can be passed through the assembly 10 and engaged with a discharge unit.

When it is desired to close the spout, the fluid cylinders 81 are actuated to extend the

rods 82. The pivotably connected link bars 88 translate the linear force to move the

pivotably connected pivot bars 72 along an arcuate path as represented by the arrows

A in Figure 13. The arcuate path and the curvature of the pivot arms 72 minimizes

the potential for pinching of the spout. Actuation of the cylinders 81 continues as

the pivot arms 72 constrict the bag to a central region 90. The pivot arms 72 are then

extended to a position beyond the central region 90 and overlap such that the bag

spout forms a "Z" as it travels between the pivot arms 72. The over extension is

preferred, but may not be required in all applications. The preferred operating system 100 of the closing assembly 10 will be

described with reference to Figure 15. The preferred operating system 100 includes

a manual valve 102, a safety push button 104, a selector switch 106, a timer 108, and

an automatic control 110. The manual valve 102 controls the flow of fluid into the

cylinders 81 and is moveable between a nuetral position and "close" and "open"

positions wherein fluid is provided to the cylinders 81 to extend or retract the rods

82. To operate the assembly 10 manually, an operator uses the manual valve 102 to

control flow into and out of the cylinder 81 as desired. The system 100 also

preferably includes a safety push button 104 which closes the fluid supply 101 unless

engaged. If either the push button 104 or valve 102 is released, pressure to the

cylinder 81 will cease. As such, the operator must use one hand to engage the push

button 104 and the other to operate the manual valve 102, thereby reducing the

likelihood the operator will inadvertently place a hand in the path of the moving

components.

In some instances, an operator may want to remove one or both hands while

maintaining pressure in the cylinder 81, for example, to retie the spout. As such, the

preferred system 100 also includes an automatic control 110. To utilize the

automatic control 110, the selector switch 106 must be in the "auto" position. If the

switch 106 is in the "auto" position, the timer 108 will time the duration the manual

valve 102 is in the "close" position. If the manual valve 102 is in the "close" position

for a given time interval, for example five seconds, the timer 108 will trigger the automatic control 110. The automatic control 110 will then continue to supply fluid

pressure to the cylinder 81, irrespective of whether the manual valve 102 or push

button 104 are engaged, until the operator moves the selector switch 106 to a

"manual" position. With the selector switch in the "manual" position, the operator

can use the manual valve 102 to open the cinching assembly 60. Other manual and

automatic operating systems may also be used.

Claims

What is claimed is:

1. A bag closing apparatus comprising:

a frame structure;

at least three pivot arms, each pivot arm having first and second ends and an

arcuate portion therebetween, pivotably connected to the frame structure adjacent

one end thereof and located relative to each other such that each pivot arm crosses

at least two other pivot arms to define a confined closure area; and

actuation means for moving the pivot arms between spread positions wherein

the closure area has a predetermined area and closed positions wherein the closure

area has a smaller area.

2. The apparatus of claim 1 wherein each pivot arm has a substantially J-

shape configuration.

3. The apparatus of claim 1 wherein each of the pivot arms is mounted

of at a different elevation such that the pivot arms are stacked.

4. The apparatus of claim 1 comprising four pivot arms.

5. The apparatus of claim 1 wherein the closure area has a substantially

circular configuration with the pivot arms in the spread positions.

6. The apparatus of claim 1 wherein the pivot arms are extendable beyond

a central region to overlap one another and pass the closure area.

7. The apparatus of claim I wherein the actuator means includes a

plurality of actuator assemblies, each including a fluid cylinder with an extendable

rod.

8. The apparatus of claim 7 wherein each pivot arm has a link tab

extending therefrom which is pivotably coupled with a first end of a link bar, a

second end of the link bar coupled to an attachment portion of a respective rod.

9. The apparatus of claim 8 wherein two link bars are pivotably coupled

to the attachment portion of a respective rod such that the rod actuates a pair of pivot

arms.

10. The apparatus of claim 1 wherein the frame structure includes a

cylindrical housing.

11. The apparatus of claim 10 wherein the housing includes a cylindrical

body extending between opposed top and bottom plates.

12. The apparatus of claim 11 wherein the top and bottom plates have an

aperture therethrough and the apertures are coaxial to define a cylindrical passage

through the housing.

13. The apparatus of claim 11 wherein the housing further comprises a

support ring secured proximate the bottom plate such that a lower one of the pivot

arms is tangential thereto.

14. The apparatus of claim 13 wherein a ring member depends from the top

plate such that an upper one of the pivot arms is tangential thereto.

15. The apparatus of claim 14 wherein the pivot arms have a combined

vertical dimension and the support ring and ring member are spaced a distance

approximate the combined vertical dimension.

16. The apparatus of claim 11 wherein the housing further comprises an

removable support plate having an aperture therethrough.

17. The apparatus of claim 1, further comprising a bag located in the bag closing

apparatus having a bag spout which extends through the confined closure area, and

wherein in the closed positions, the pivot arms are extended to a position beyond a central region and overlap such that the bag spout forms a "Z" as it extends between

the pivot arms.