JPH05170237A - Automatic bag opening device - Google Patents

Abstract

PURPOSE:To provide an automatic bag opening device which can automatically open a real bag, which wraps a powder/granular body, while preventing dust or paper lint, etc. from generating. CONSTITUTION:A bag 10 containing a powder/granular body, which is carried to a specified position, and is held under a condition in which the angle of the cutting surface of a sharp cutter 21a to the outer packaging of the bag is kept to a specified angle, is moved to a specified direction to tear up the outer packaging, and the bag is divided in two sections. The opening of the divided bag is tilted to discharge the contained powder/granular body, and the bag from which the discharge has been completed is moved and discarded to perform the opening of the bag automatically.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic bag opening device for automatically taking out powder particles filled in a paper (kraft) or plastic bag from the bag, and more particularly to the exterior of the bag by a pull-cut method. The present invention relates to an automatic bag opening device having a device for incising.

[0002]

2. Description of the Related Art Conventionally, when a powder or granular material is taken out of a bag, a knife or a knife such as a sickle is used to manually cut the bottom or side of the bag.

The weight of the powder or granular material filled in such a bag is generally 20 kg to 25 kg, and the incision quantity of the bag is often 1000 bags or more per day, which is very difficult. It takes labor. Further, when the bag filled with the powder and granules is cut out and taken out, the generation of dust is unavoidable and causes a deterioration of the working environment, which is a problem in terms of occupational health. Therefore, various automatic bag opening machines have been developed and provided for the bag opening operation.

The bag opening means of the currently provided automatic bag opening machine is the bottom or side or side and bottom of a paper or plastic bag filled with powder particles using a rotating flat blade rotating at high speed. And a so-called guillotine cutting in which a cutting blade is pressed against the bag and shearing is performed.

[0005]

However, according to the experiments conducted by the inventor, both in the conventional guillotine cutting method and in the apparatus using the rotary flat blade, the fiber of the bag exterior of the cut surface is cut by the blade when the bag is opened. However, there are many foreign matters such as paper scraps, and the foreign matters are mixed into the product. In particular, in a device using a rotary flat blade as a bag opening means, when the contents filled in the bag are granules, the granules are incised by the rotary blade, and the granules are deformed or There are problems such as thermal deformation of particles due to contact friction heat.

Therefore, the automatic bag opening machine using the above-mentioned means or the like which has been provided at present cannot be adopted in the process which is free from the inclusion of foreign matter. For this reason, the bag opening operation for the process in which foreign matter is a problem has been performed by the conventional manual bag opening operation.

It is an object of the present invention to provide an automatic bag opening device having a bag opening mechanism capable of extremely reducing foreign matters such as paper scraps generated during bag opening, and capable of automatically opening a bag. And

[0008]

An automatic bag opening device of the present invention comprises a carrying-in means for carrying a bag containing a powder or granular material into a predetermined position, a cutter, and a means for moving the cutter in a predetermined direction. With respect to the outer bag of the bag carried in by the carrying-in means, the cutter is moved while the angle of the cutter surface with respect to the exterior is kept at a predetermined level, the exterior is cut off, and the bag is divided into two; The discharging means for tilting the opening of the bag cut by the means to discharge the powder and granules contained therein, and the means for moving and discarding the bag after the discharging of the powder and granules by the discharging means are provided. Characterize.

Further, in the above apparatus, it is preferable that the angle of inclination of the cutter surface with respect to the exterior of the bag is 45 degrees or less and the bag is pulled out.

Further, in the above apparatus, an ultrasonic cutter may be used as the cutter, and the cutter may be cut while being ultrasonically vibrated to reduce paper waste and the like.

Furthermore, an excluding means for eliminating the powder or the like adhered to the cutter is provided to remove the powder or the particles adhered to the blade surface at the time of cutting, and then the cutter surface has a sharp state at the time of the cutting. It is also preferable to keep

[0012]

In the automatic bag opening device of the present invention, since it has the above-mentioned structure, the bag containing the powder and granules to be opened is automatically conveyed to the hopper which is an incision place, and the bag is opened at that place. , Is cut off by a cutter and divided into two. Here, since the bag is incised by pulling out, it is possible to minimize the generation of foreign matter such as paper scraps during the incision. The two incised bags are each tilted at a predetermined angle, and the powder particles contained therein are automatically discharged from the opening to a hopper or the like provided below. Further, the bag from which the encapsulating powder and granules have been discharged is removed from the incision site and discarded, the incision site is opened, and the next bag to be incised can be received. With such a configuration, it is possible to realize an automatic bag opening operation with less generation of foreign matter.

[0013]

1 is a top view of an automatic bag opening apparatus according to an embodiment of the present invention, and FIG. 2 is a side view thereof. As shown in these drawings, in the apparatus of the embodiment, the actual bag 10 in which the powder or granular material is contained in a paper or plastic bag is opened, and the encapsulated powder or granular material is placed in the hopper 5. The bag opening section 1 to be discharged,
The positioning section 2 provided in the preceding stage of the bag opening section 1, the loading section 3 for loading the actual bag 10 into the positioning section 2, and the actual bag 10 that has been loaded and discharged from the positioning section 2 into the bag opening section 1 are opened. It is composed of a transport mechanism 4 that is carried out from the bag portion 1.

Below the bag opening portion 1 is provided a hopper 5 for receiving the powder particles discharged from the opened bag. Then, the actual bag 2 is conveyed in the direction of arrow A in FIG. 1, positioned by the positioning unit 2, and further carried into the bag opening unit 1.
Then, after the powder particles contained therein are discharged, they are transported in the direction of arrow B and discarded.

The carry-in section 3 is provided with a plurality of roller conveyors 6 for moving the actual bag on the conveying path, and a drive motor 7 for rotationally driving the roller conveyors 6. The roller conveyors 6 are rotatably supported in parallel with each other at a predetermined interval so as to be orthogonal to the conveying direction,
The actual bag 2 is conveyed by being rotated via the belt 8 by rotating the drive motor 7.

The positioning section 2 has a roller conveyor 6a which is arranged at the same level as the roller conveyor 6 of the carry-in section 3 and is rotatably arranged at a predetermined interval.
Further, the positioning portion 2 is provided with a guide portion 9 for guiding the conveyance of the actual bag to the side thereof, and a guide portion 9 facing the guide portion 9 via the conveyance path of the actual bag 10. And an air cylinder 11 for pressing and positioning the same.
The air cylinder 11 has a rod 11a that moves in a direction orthogonal to the carrying direction, and its tip is pressed against a carrying guide provided facing the air cylinder 10 without damaging the outer casing of the actual bag. Push plate 12 for positioning
Is fixed. Here, a belt conveyor may be used instead of the roller conveyor.

FIG. 3 is a structural diagram of the transport mechanism. The transport mechanism 4 is disposed above the positioning unit 2 and the bag opening unit 1, and transports the real bag 10 positioned by the positioning unit 2 to a predetermined position of the bag opening unit 1; An empty bag discharging unit 23 for discharging the empty bag in which the powder particles contained therein are completely discharged from the bag portion 1. This transport mechanism includes a slide rail 4a provided along the transport direction.
And a real bag transport unit 2 movably provided on it
It has a rodless air cylinder 27 that integrally moves 2 and the empty bag transport unit 23. The units 22 and 23 are installed on the slide rail 4a at regular intervals. These two units 22, 23
Perform the same operation at the same time by the rodless air cylinder 27. Here, the carrying speed of the roller conveyor 6 of the carry-in section 3 and the carrying speed of the carrying units 22 and 23 are designed and adjusted to be the same. Since these units 22 and 23 have the same structure, only the actual bag transport unit 22 will be described below. Conveying rods 4b are provided in these units 22, and the vertical movement of these conveying rods 4b is performed by operating a rodless air cylinder 24.

A push plate 28 is fixed to the lower end of the transport rod 4b of the actual bag transport unit 22. On the other hand, as shown in FIG. 3, its upper end is connected to the rodless air cylinder 24 via a fixing plate 4f and a guide 4g. By moving the air cylinder 24 up and down, the transport rod 4b is guided by the guide 4g to move up and down, and the push plate 28 fixed to the tip thereof also moves up and down. When the actual bag 10 is carried into the bag opening section 1 from the positioning section 2, the push plate 28 is moved in the carrying direction in a lowered state. The transport rod 4b that has finished transporting the actual bag 10 to the bag opening section 1.
Is pushed up by the rodless air cylinder 24, and the push plate 28 fixed to the tip of the rod 4b rises to the position indicated by the chain double-dashed line. The actual bag conveying unit 22 with the rod 4b raised is pulled back by the rodless air cylinder 27 to the right end position in FIG. When the mounted transport unit 22 is pulled back, the actual bag 10 is positioned by the positioning unit 2 and is in a standby state. In this state, the rod 4b of the actual bag conveying unit 22 is lowered by the rodless air cylinder 24, and then moved in the conveying direction to open the actual bag 10 next.
Transport to. That is, the push plate 28 of the transport rod 4b is driven so as to draw a rectangular trajectory. By repeating this operation, the actual bag 10 is automatically conveyed to the bag opening section 1.
The empty bag transport unit 23 is the actual bag transport unit 2
An empty bag which has been driven simultaneously with 2 and has completed discharge of the powder and granules from the bag opening section 1 is carried out from the bag opening section 1 and discharged. The empty bag transport unit 23 moves to a position indicated by a chain double-dashed line in FIG. 2 and stops, and after the empty bag 10 is completely discharged, the empty bag transport unit 23 performs the same movement as that of the actual bag transport unit 22.
Return to the position indicated by the solid line.

As shown in FIG. 1, the bag opening section 1 has two mounting tables 20 for supporting the conveyed real bag 10 on the hopper 5.
a, 20b, a cutter 21a arranged so as to maintain an angle of 45 degrees with respect to the upper surface of the mounting table, and a cutter portion 21 for dividing the actual bag 10 into two, and a powder contained in the actual bag 10. A dispensing device 30 is provided to incline the platforms 20a and 20b to eject the particles and dispense the particles. This platform 20
a and 20b are predetermined intervals in the carrying direction, for example, 10 mm
The actual bag 10 is placed on the mounting table 20a,
The gap D between 20b is carried in so that it may be located in the center part of the actual bag 10. As shown in FIG. 2, suction cups 29a, 2 capable of sucking a negative pressure are provided on the mounts 20a, 20b, respectively.
A plurality of 9b are provided, and the real bag 1 is placed on the mounting tables 20a and 20b.
It is configured so that 0 can be fixed. In the bag opening section 1,
The air cylinders 22a, 22 for preventing the movement of the real bag 10 that has been conveyed when the real bag is opened in the direction orthogonal to the conveyance direction.
b are provided, and the actual bag pressing plate 23 is provided at the tip of each of them.
a and 23b are attached. Push plates 23a, 23b
Are arranged on the same line as the guide 9. The push plate 23
The distance between a and 23b is set to 3 to 4 mm so as to be the minimum distance required for the cutter 21a to pass. If this interval is wide, when the actual bag is incised with the cutter, the pulling and cutting operation will not be successful and may cause paper scraps and the like. The real bag 10 is the platform 2
0a, 20b placed in air cylinders 22a, 22
b operates, and the actual bag 10 is extruded by 20 to 40 mm. Under such a state, the bottom of the actual bag 10 is sucked and fixed by a plurality of suction cups 29a and 29b provided on the mounting tables 20a and 20b, respectively.

In this state, with the actual bag 10 fixed near the incision by the cutter 21a, the cutter 2
Reference numeral 1a is for cutting the exterior of the actual bag into two parts.

FIG. 4 shows a mechanism of the cutter unit. The cutter unit 21 includes a slide rail 25 for moving the cutter 21a so as to cross the gap between the mounting tables in the transport direction, a blade fixing metal fitting 26 for fixing and holding the cutter 21a on the slide rail 25, and a blade of the cutter 21a. An air brush 27 for removing the powder particles attached to the surface is provided. The cutter 21a is fixed by the blade fixing metal fitting 26, and moves on the slide rail 25 by the rodless cylinder 35 so as to divide the actual bag 10 placed on the mounting table into two parts.
The blade fixing metal fitting 26 is provided with an angle adjusting mechanism for adjusting the angle of the blade surface of the cutter 21a with respect to the upper surface of the mounting table. The inclination angle between the blade surface of the cutter 21a and the upper surface of the mounting table is preferably θ = 45 degrees or less from the viewpoint of generation of foreign matter during incision. If the tilt angle is made smaller, the generation of foreign matter can be further suppressed, but if it is made too small, the cutter 2
The blade of 1a becomes long, which causes a problem that the entire apparatus becomes large. As shown in the figure, since the actual bag 10 needs to be completely divided into two, it is necessary to make the upper end 21b of the cutter 21a higher than the height h of the actual bag 10. Any cutter can be used as the cutter 21a as long as it has a sharp double-edged blade.
An ultrasonic cutter is preferable from the viewpoint of generation of foreign matter. Specifically, this ultrasonic cutter uses a PZT element to generate a frequency of 19
It is used while vibrating at an amplitude of 40 to 50 μm at a frequency of kHz.

The air brush 27, as shown in FIG.
After the cutting is completed, the cutter 21a is arranged on the passage through which the blade surface passes, and air is blown from both sides of the blade surface of the cutter 21a. At the end of the cutting of the actual bag 10, the powder adhered to the cutting surface of the cutter 21a. It is configured to remove particles and the like. The powder particles attached to the blade surface impair the sharpness of the cutter 21a and generate a large amount of foreign matter during the next incision. However, by providing such an air brush 27, the sharpness of the cutter can always be maintained, and the amount of foreign matter generated during the incision can be reduced.
It is also possible to arrange a rotary brush as the removing device instead of the air nozzle system, and the same effect can be obtained. Further, it is possible to rotate the grindstone instead of the air brush to sharpen the cutter blade.

The bag opening section 1 is provided with a payout device 30 for inclining the mounts 20a and 20b so that the portions facing each other are opened. FIG. 5 shows a detail of the dispensing device and a right half of which is a partial cross-sectional view. The paying-out device 30 includes the mounting tables 20a and 20b arranged independently of each other.
The air cylinder 31 is configured to rotate the shaft 33 to which the mounting table 20a is fixed.
Then, by driving the air cylinder 31,
The mounts 20a and 20b can be simultaneously tilted up to the angle of the two-dot chain line. When the mounts 20a and 20b are tilted, they are divided into two on the mounts and suckers 29a and 29b.
The actual bag held in step 1 will be tilted together with the mounting table while being in close contact with the mounting table. Therefore, the contents are discharged to the hopper 5 through the cut opening of the actual bag. When the discharge of the contents is completed, the pedestals 20a and 20b, the shaft 33, and the cylinder 31 are arranged on a base body (not shown) that can move to the left and right, and the pedestals 20a and 20b start to incline and at the same time.
A mechanism for facilitating the discharge of the contents is provided by moving the shaft 33 to the position of the chain double-dashed line so as to open the space between a and 20b. Stands 20a, 20
If the inclination angle α of b is about 55 to 65 degrees, the contents can be easily discharged. If the contents are poorly fluidized or if the contents are attached to the bag due to static electricity and the discharge is poor, repeat the opening and closing of the platform several times or tilt the platform downwards to eject the contents. When the above is almost completed, the discharging efficiency can be improved by adding a device for injecting air into the bag.

The specific structure of the payout mechanism is obvious to those skilled in the art, and thus detailed description thereof is omitted.

Next, the automatic bag opening operation by the automatic bag opening device of the embodiment will be described. In FIG. 1, the real bag is conveyed on the conveying path in the direction of the arrow and is carried into the positioning portion. The actual bag carried into the positioning section is positioned by being pressed against the guide section by the air cylinder, and then carried into the bag opening section by the actual bag conveying unit.
It is placed at approximately the center of the two pedestals 20a and 20b and pushed by the cylinder. After that, the actual bag 10 is suction-fixed on the mounting table by the suction cup. After fixing
The cutter moves in the gap between the mounts, and the actual bag 10 is divided into two. When the division is completed, the air cylinder 31 is driven, the mounting table is tilted, and the granular material is discharged from the two divided real bags 10 to the hopper 5. When the discharge of the powder and granules from the actual bag is completed, the air cylinder 31 is driven again and the mounting table is held horizontally. The vacuum of the suction cups 29a and 29b is broken, and the holding of the empty bag is released, and at the same time, the suction cup 29
The a and 29b are moved below the lower surface of the mounting table so as not to obstruct empty bag discharge, and pressurized air is ejected from the suction cups 29a and 29b, thereby discharging the dust sucked by the vacuum. Next, the empty bag transport unit above the mounting table is driven, and then the rod 4c of the empty bag transport unit 23 is lowered and moved to discharge the empty bag.
At the same time that the empty bag transport unit discharges the empty bag, the next actual bag positioned in the positioning unit 2 is the loading table 2 of the bag opening unit 1.
0a, 20b is conveyed. The cutter 21a returns to the initial position after the transport rod 4c of the empty bag transport unit 23 has passed through the dividing portion of the loading table and before the next actual bag is transported to the bag opening section 1.

In this way, the paper or plastic bag filled with powder or granules can be automatically opened by the cutting method using the ultrasonic cutter or the cutter blade. By using the apparatus of the above embodiment, about 24
It has become possible to automate the opening work of 0 bags.

[0027]

EFFECTS OF THE INVENTION By opening a paper or plastic bag filled with powder or granules by a cutting method using an ultrasonic cutter or a cutter blade, the generation of foreign matter such as paper scraps during bag opening is reduced. be able to. With this bag opening device,
It is possible to extremely reduce the possibility that the process line is clogged or the foreign matter is mixed in the product due to the foreign matter mixed in the downstream side device and the process that use the content of the opened bag as a raw material.

Further, when the bag is opened, it has almost no effect on the contents of the bag and can be used for refilling a product from a paper bag to a paper bag or the like.

The conventional commercially available bag opening machine cannot be used in a process in which a large amount of paper scraps and the like are generated when opening the bag and foreign particles cannot be mixed in. Therefore, it is unavoidable for a person to use a knife such as a knife or a sickle. I was opening the bag carefully. The manual bag opening work has a safety problem because a knife is used. Further, when the content of the bag is powder, there is a problem that the working environment is deteriorated by dust when the bag is opened and put into the next step. The present invention has solved these problems. Further, since the amount of foreign matter mixed in when opening the bag is reduced, it is possible to improve the operation rate of the process, improve the working environment, improve the safety, and free the worker from heavy muscle work.

[Brief description of drawings]

FIG. 1 is a top view of an automatic bag opening device according to an embodiment of the present invention.

FIG. 2 is a side view of the automatic bag opening device according to the embodiment of the present invention.

FIG. 3 is an explanatory view of a transport mechanism of the automatic bag opening device shown in FIG.

FIG. 4 is an explanatory diagram of a cutter unit of the automatic bag opening device shown in FIG. 1.

5 is an explanatory view of a dispensing device of the automatic bag opening device shown in FIG. 1. FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Bag opening part, 2 ... Positioning part, 3 ... Carrying in part, 4 ... Conveying mechanism, 5 ... Hopper, 10 ... Real bag, 20a, 20b ... Stand,
22 ... Actual bag transport unit, 23 ... Empty bag transport unit, 2
1 ... Cutter part, 21a ... Cutter.

Claims (4)

[Claims] 1. A carrying-in means for carrying in a bag containing a powdery or granular material to a predetermined position, a sharp cutter, and means for moving the cutter in a predetermined direction, the bag being carried in by the carrying-in means. With respect to the outer bag, with the cutter surface being kept at a predetermined angle with respect to the outer casing, the cutter is moved to cut off the outer casing to divide the bag into two parts, and an opening portion of the bag cut by the cutting device. An automatic bag opening device comprising: a discharging means for discharging the powder and granules contained therein, and a means for moving and discarding the bag in which the discharging of the powder and granules is completed by the discharging means. 2. The automatic bag opening device according to claim 1, wherein an angle of inclination of the cutter surface with respect to the exterior of the bag is 45 degrees or less. 3. The automatic bag opening device according to claim 1, wherein the blade is an ultrasonic cutter. 4. The automatic bag opening device according to claim 1, 2 or 3, wherein said cutting means further comprises a removing means for removing powder or the like adhering to said cutter.