RU2676962C2 - Sack feeding device for sacking machine - Google Patents

Abstract

FIELD: transportation, packaging and storage of goods.SUBSTANCE: device comprises means for picking up one sack at a time from a stack of sacks arranged on a first plane, said sacks having two long sides and two short sides, and at least one corner between a long and a short side comprising a valve, said long and short side with a valve in between being referred to as a short valve side and a long valve side. Device also comprises means for pushing one sack at a time so that said long valve side is arranged on a second plane and abuts against a retainer, and the long side opposite to said long valve side is contained by a vertical edge opposite to said retainer, means for pushing said short valve side to a predetermined position on said second plane, means (46) for lifting said short valve side, away from said second plane and means for holding the short valve side when the pushing means push the sack.EFFECT: invention provides improved reliability of sack delivery.9 cl, 10 dwg

Description

Technical field

The present invention relates to a device for attaching a bag with a valve to the loading pipe of a bag filling machine, in particular, to a bag feeding device for such a machine. The bags are made of paper or plastic, equipped with a valve, glued, with or without a neck, designed for powder or granular materials, such as cement, etc. The bags have a rectangular shape with a valve installed in the corner between the long side and the short side of the bag. The valve opening is opened by diluting the sides and attached to the loading pipe of the bag filling machine. The bag filling machine has one or more feeding openings through which the bags suspended from them are filled. Bags are connected to the feed holes manually or automatically.

State of the art

Known automatic devices for attaching bags to the feed holes, the gripping bags on one of the located in a row of stop bags. Using the appropriate suction cups, the valve opens and the bag attaches to the feed opening of the bag filling machine.

There are also rotary bag filling machines having several feed openings arranged in a circle at certain distances.

The bag feed devices to the rotary bag filling machine are of significantly higher complexity, since they also have to adapt to the circular movement of the feed opening.

The task of supplying bags to a bag filling machine is simplified when they are of a constant size, but in some geographical areas bags are made manually or with a low level of mechanization, which implies the use of bags with a wide tolerance of 5% or more in size.

These deficiencies are exacerbated if the bags do not have sufficient rigidity and therefore cannot be evenly laid in the feet.

Disclosure of invention

An object of the present invention is to provide a device for attaching a bag with a valve to a loading tube of a bag filling machine, adapted to use bags having significant dimensional deviations and made by stitching.

In accordance with the present invention, these and other problems are solved by a bag feeding device for a bag filling machine, comprising: means for individually gripping bags from a bag stack located on a first flat surface; moreover, these elongated bags have two long sides and two short sides, and at least one angle between the long side and the short side having a valve, the long and short sides with the valve between them are called the short valve side and the long valve side; means for individually pushing the bags so that the long valve side is located on the second flat surface and abuts against the stop, and the long side opposite this long valve side is held by a vertical rib opposite the stop; means for pushing the short valve side to a predetermined position on a second flat surface; means for lifting the short valve side from the second flat surface.

Other characteristics of the invention are described in the dependent claims.

This solution provides several advantages compared to known devices. In particular, the device in accordance with the present invention allows you to grab the bags one at a time, taking into account the significant variation in their size, while maintaining high speed.

Brief Description of the Drawings

The characteristics and advantages of the present invention will become apparent upon becoming acquainted with the following detailed description of an embodiment thereof, illustrated by the particular example shown in the attached drawings, in which:

in FIG. 1a is a perspective view of a device in accordance with the present invention for attaching a bag with a valve to a loading pipe of a bag filling machine from the side where the bags are captured, and in FIG. 1b shows a fragment of it in detail;

in FIG. 2a is a perspective view of a device in accordance with the present invention for attaching a bag with a valve to a loading pipe of a bag filling machine from the side where the bags are fed into the device, and FIG. 2b shows a fragment of it in detail;

in FIG. 3 is a plan view showing a bag stack feeding device according to the present invention for removing and supplying a bag with a valve to a loading pipe of a bag filling machine;

in FIG. 4a, on one side, there is shown a bag stack feeding device according to the present invention for removing them and supplying the valve bags individually to the loading pipe of a bag filling machine, and FIG. 4b shows a fragment in detail;

in FIG. 5a, a front view where the bags are captured shows a bag stack feeding device according to the present invention for removing them and supplying the valve bags individually to the loading tube, and FIG. 5b shows a fragment in detail;

in FIG. 6 is a schematic illustration of a bag with a valve.

Detailed Description of the Invention

In the present invention, in particular, hand-sewn bags made of plastic material are considered, having, therefore, low stiffness in an unfilled condition, not able to withstand significant tensile loads without deformation, and with dimensions that are not constant from one bag to another.

The valve bags have an elongated shape with two long sides and two short sides, with at least one angle 5 between the long side and the short side.

The long and short sides of the bag with the valve between them are called the short valve side 6 and the long valve side 7. The short side opposite the short valve side 6 is 8, and the long side opposite the long valve side 7 is 9.

According to the attached drawings, the device for feeding a stack of bags for removing and attaching one bag with a valve to the loading pipe of a bag filling machine according to the present invention has a frame 10, on one side of which there is a flat surface 11 for stacking a large foot on it the number of bags.

A stack of bags located on a flat surface 11 is pushed by a pair of vertical plates 13 moving horizontally and pushing the bags onto an abutment 14 located across the direction of movement of the bags.

A side plate 15, having the ability to move across the mentioned direction of movement, covers the stack of bags along the short side 8 of the bag on the part opposite to the valve, pressing against the opposite metal sheet 100.

On the frame 16 of the machine installed means 17, designed to move individual bags located in the foot.

Means 17 include a rod 20 located across the direction of movement of the bags, on which 4 suction cups 21 are mounted, connected by tubes to a vacuum unit located outside the machine.

The rod 20 has the ability to move vertically and horizontally so that the suction cups 21 fit close to the long edge of the bag near the stop 14, grab the bag when the vacuum is turned on, lift and move the bag.

The vertical movement of the rod 20 is provided by a linear actuator 22, preferably pneumatic, mounted on a small side plate 23 to which the rod 20 is attached.

The horizontal movement of the rod 20 is provided by a hinged parallelogram.

The small side plate 23 is connected to the front arm 24 by means of a stud 25, and to the rear arm 28 is connected by another stud. On top of the levers 24 and 28 are attached to the frame 16 with studs 26.

The horizontal movement of the rod 20 is provided by a horizontal linear actuator 27, preferably pneumatic, rigidly attached to the upper part of the frame 16, a retractable link of which is attached to the lever 24.

The machine has a cross member 30 connecting two lateral horizontal supports 16. A lever 31 is pivotally attached to the cross member 30, at the end of which a pair of free-rotation rollers 32 are mounted. The lever 31 is perpendicular to the cross member 30.

The lever 31 can be rotated at a certain angle (approximately 30 °) around the studs on the cross member 30, while the rollers 32 move along an arc of a circle.

This movement is provided by a linear actuator 33, mounted on top of one side to the structure 16, and the other side to the lever 31, at a point near the rollers 32.

In the lowered position, the rollers 32 are pressed against the roller 34, driven by rotation of the motor around its axis.

The roller 34 is located down in the direction of movement from the stop 14, and slightly raised relative to a flat surface 11.

On the bed 10 is also installed another flat surface 40, located down in the direction of movement from the flat surface 11, and, basically, at the same height. A bag rests on these flat surfaces when it is gripped by suction cups 21.

Down in the direction of movement from the roller 34 and parallel to it is a bar 35 having a vertical rib 36 facing a flat surface 40.

The bag entering the flat surface 40, as will be described below, abuts the long side 7 from the side of the valve against a pair of stops 41 located transversely to the direction of travel at the end of the flat surface 40, and the long side 9 opposite the valve 5 abuts against a vertical rib 36, also located across the direction of travel. The distance in width between the stops 41 and rib 36 is slightly larger than the width of the bag.

The plate 42 can move across the direction of movement of the bag, and thereby shifts it by several centimeters and places it in a position determined by the end of the stroke of the plate 42. Thus, even if the bag is not positioned properly, the length of the stroke of the plate 42 is sufficient to allow It was always push the bag to the desired position.

On the plate 42 there are also means 38 for pressing the bag while pushing it, to hold the bag and prevent it from moving too far. To ensure high speed handling of the bags, the plate 42 pushes the bag at a speed at which the impact may be too strong (due to inertia), and the bag will be improperly placed. For example, a lever 38 is used located in front of the plate 42, which, lowering, presses the bag against a flat surface 40 (allowing it to slide), while the plate 42 pushes the bag. In particular, the lever 38 has a window in the central part through which the plate 42 passes, so these two elements do not interfere with each other.

To ensure the displacement of the bag on a flat surface 40 under the influence of the pressure of the plate 42, two levers 38 are located directly above the bag, which should move the plate, to create a counteracting friction force, preventing the displacement of the bag by inertia beyond the limits determined by the stroke of the plate 42.

The movement of the plate 42 occurs under the action of the linear actuator 39.

The movement of the lever 38 occurs under the action of the linear actuator 37.

Above the flat surface 40, there is an arm 43 fixedly attached to the bed 10, which covers approximately half of the flat surface 40, located across the direction of movement of the bags, and to the bed 10 it is attached from the side opposite to the plate 42.

A rod 45 for gripping the bags is pivotally attached to the bracket 43, located along the direction of movement of the bags and having 4 suction cups 46 connected by tubes to a vacuum unit located outside the machine.

The rod 45 can be rotated at some angle around the studs located on the bracket 43, to ensure the movement of the suction cups 46 in the angular range of about a quarter of a circle.

This movement is provided by a linear actuator 47, attached on one side to the bracket 43, and the other side to the structure 44, near the suction cups 46.

On the bracket 43 also has a rod 48 located perpendicular to the bracket 43 and elongated along the direction of movement of the bags.

In order to accelerate the reception of the next bag, another hinged parallelogram is located on the bracket 43 at the farthest point from the suction cups 46 (on the short side 8 of the bag opposite the valve 5).

One side is attached to the bed 10 by one side 50, pivotally attached by the other side to the second link 51, to the end of which a small side plate 52 is pivotally attached. A vertical linear actuator 53 is mounted on this small side plate 52, which holds and moves the pair of suction cups 54 vertically Parallel to the second rod 51, a lever 55 is mounted. The lever 55 is pivotally moved both relative to the small side plate 52 and relative to the first rod 50. Another actuator 56 is installed between the element 50 and the extension part of the second rod 51.

The actuator 56 moves the second rod 51 so that the small side plate 52 and therefore the suction cups 54 can describe a quarter of the circumference, while the actuator 53 lowers and raises the suction cups 54.

Means 60 for extracting the bag from the flat surface 40 are also connected to the bed 10, for opening the bag valve 5 and attaching, after that, the bag to the feed openings of the bag filling machine.

Means 60 include a vertical strut 61, in the upper part of which is mounted a lever 62, which rotates around the vertical axis of the strut 61.

A guide 63 is mounted at the end of the lever 62, with a holder 64 located on it, on which the first grippers 65 are formed, formed by two levers with opposite suction cups 66 at the ends, and the second grippers 67 without suction cups, facing the first gripper 65 on the reverse side.

The work of the invention, obvious to a specialist who has read the description, occurs, in particular, as follows.

Bags with the valve 5, oriented towards the machine, are located one above the other on a flat surface 11.

A pair of vertical plates 13, which in the initial position are located on the outside of the flat surface 11, are driven by the respective drive belts and move along the guides so as to press the stack of bags against the stop 14.

The side plate 15 moves to the foot of the bags, limiting and fixing its position.

Suction cups 21 are lowered by turning on the actuator 22, while the actuator 27 pulls the lever 24 toward itself, and the suction cups 21 are lowered vertically.

A suction is applied to the suction cups 21 to pull the long side 7 (valve side) of the bag toward them.

The actuator 22 raises the suction cups 21 together with the bag adjacent to them, and when they are lifted, the actuator 27 pushes the lever 24 in the feed direction of the bags, as a result of which the edge of the long side 7 of the bag is pushed forward and goes beyond the stop 14, the roller 34 and the bar 35.

In this process step, the actuator 33 holds the lever 31 and the rollers 32 raised. The suction cups 21 grab the bag at a distance of about 5-10 cm from the outer edge. By activating the actuator 33, the rollers 32 are lowered, which in motion push the part of the bag protruding from the suction cups 21 towards the roller 34. In any case, the suction cups 21 and the rollers 32 are arranged alternating so as not to interfere with each other. The suction cups 21 release the grip, and the free rotation rollers 32 press the bag against the roller 34, which by rotation pushes the bag forward against the stops 41, and the bag stops between them and the vertical rib 36.

The rollers 32 and suction cups 21 are returned to their original position to capture a new bag.

The bag is now located with the long side 7 (from the side of the valve 5) at the stop 41. A plate 42 is actuated, which pushes the bag from the short side 6 (side with the valve 5), for a predetermined distance, while holding it with the lever 38, to prevent excessive moving and going beyond a given position.

The bag remains oriented in a predetermined manner, i.e., the long side 7 (side with the valve 5) to the stop 41, and the short side 6 (side with the valve 5) in the predetermined position determined by the end of the stroke of the plate 42.

In particular, the bag valve 5 is located at a predetermined point defined by two stops, i.e., the end of the stroke of the plate 42 and the stops 41.

At this point, the suction cups 46 are lowered by a linear actuator 47 until they touch the bag, vacuum is turned on, and the suction cups grab the bag along the short side 6 where valve 5 is located and lift it. Preferably, the rod 45, on which the suction cups 46 are attached, is not straight, but has a curvature so that the bag captures a large free space near valve 5, i.e., valve 5 is free for the following operations.

At this point, the bag would be ready to be removed and attached to the feed opening of the bag filling machine. However, to accelerate the preparation of the bags, the bottom of the bag is raised to put a new bag on the flat surface 40.

Then, simultaneously with the use of suction cups 46, the suction cups 54 are also moved, first by activating the drive 56, which moves the suction cups as close to the bottom of the bag as possible, and then by activating the drive 53, which lowers them until it contacts the bag. The vacuum is turned on and the bag is gripped.

The rise of the suction cups 46 and the suction cups 54 is performed simultaneously with the lifting of the bag taken by two groups of suction cups located along the two short sides 6 and 8 of the bag.

When the bag is lifted, it rests approximately in the middle against the rod 48. Thus, the bag rises from the flat surface 40 and folds in half.

The bag is lifted and the device is controlled in such a way that the back side 8 of the bag, starting approximately from the middle of the bag, is horizontal, while the front part 6 of the bag, in which the valve 5 is located, is vertical. That is, the suction cups 46 perform a wider movement than the suction cups 54.

In this case, the bag is raised relative to the flat surface 40 so that the device, all the elements of which, having such an opportunity, have taken up the initial position, can already transfer and properly place the new bag.

A lever 62 with adjacent open grippers is pivoted to the bag and placed over the top of the bag (on the short side 6 with valve 5).

The grippers 65 and 67 move close to the bag, and a suction is applied to the suction cups 66. In particular, the grippers 65 with suction cups 66 are located on the sides 6 and 7 of the bag valve, i.e., along the short side of the front of the bag, while the grippers 67 are located on the back of the bag, always along its short part 8.

The grippers 67 are held pressed while the grippers 65 are slightly retracted so that the suction cups open the valve for attaching to the feed opening of the bag filling machine.

In the meantime, the lever 62 pivots toward the bag filling machine and the holder 64 slides along the guide 63 so that the bag is correctly positioned above the feed opening.

Other means for gripping bags from a flat surface 40, alternative to means 60, may be used.

The device performs operations with the bags one at a time, since they have different deviations in size, which do not allow to get stacks of aligned bags. At the same time, the device provides a high speed operation.

Both the materials used and the sizes can be any, in accordance with the requirements and prior art.

The proposed device allows for numerous modifications and changes within the scope of the invention, in addition, all elements can be replaced by their technical equivalents.

Claims (9)

1. A bag feeding device for a bag filling machine, comprising: means (21) for individually gripping bags from a stack of bags placed on a first flat surface (11), for elongated bags that have two long sides (7, 9), two short sides (6, 8) and at least one angle between the long side and the short side containing the valve (5), where the long and short sides with the valve between them are called the short valve side (6) and the long valve side (7); means (32, 34) of piecewise pushing the bags so that the long valve side (7) is located on the second flat surface (40) and abuts against the stop (41), and the long side (9) opposite to this long valve side (7), held by a vertical rib (36) located opposite the stop (41); means (42) for pushing the short valve side (6) to a predetermined position on the second flat surface (40); means (46) for lifting the short valve side (6) from the second flat surface (40); and means (38) for holding the short valve side (6) when the pushing means (42) push the bag. 2. The device according to claim 1, characterized in that it contains means (65, 67) for gripping the bag with gripping devices on the short valve side (6), containing means (66) for opening the valve (5). 3. The device according to one of the preceding paragraphs, characterized in that the means (32, 34) of unit pushing of the bags are made with the possibility of receiving bags from means (21) of unitary capture of bags and include the first suction cups (21) for lifting the long valve side (7) and means (27) for moving the suction cups (21) along the direction of movement of these bags. 4. The device according to one of the preceding paragraphs, characterized in that the means (32, 34) of piecewise pushing of the bags include a rotating roller (34) and a pair of free-rotation rollers (32) adapted to be pressed against the rotating roller (34). 5. The device according to one of the preceding paragraphs, characterized in that the means (42) for pushing the short valve side (6) include a plate mounted to move across the direction of movement of the bag and push the bag to a predetermined position. 6. The device according to one of the preceding paragraphs, characterized in that the means (38) for holding the short valve side (6) comprise a lever which, when it is lowered, presses the bag against said flat surface, while said pushing means push the bag. 7. The device according to one of the preceding paragraphs, characterized in that the means (46) for lifting the short valve side (6) from the second flat surface (40) contain second suction cups (46). 8. The device according to one of the preceding paragraphs, characterized in that it comprises lifting means (54) from the second flat surface (40) of the short side (8) opposite the short valve side (6), in addition to the short lifting means (46) valve side (6) from the second flat surface (40). 9. The device according to one of the preceding paragraphs, characterized in that it comprises a rod (48) located along the direction of movement of the bags and installed between the means (54) of lifting from the second flat surface (40) of the short side (8) opposite the short valve side (6), and means (46) for lifting the short valve side (6) from the second flat surface (40).

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