JP2006273388A - Bag opening method and bag opening machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bag opening machine capable of enduring against a long-term use under application of a general-purpose cutter, facilitating its maintenance work, a stable bag opening work and a positive discharging of stored content. <P>SOLUTION: This bag opening machine comprises a first table 10A turned from a bag mounting attitude supporting a substantial half of a bag 1 before its seal opening and being changed to a stored content discharging attitude for directing an opening part of the bag 1 in a downward direction, a second table 10B connected to the first table 10A through a common turning shaft 11, turned from the bag mounting attitude supporting a substantial other half of the bag 1 to change the opening to the stored content discharging attitude in a downward direction, a bag fixing part temporarily fixing the lower surface of the bag 1 to the upper surface of each of the first table 10A and the second table 10B by means such as suction and the like and a cutter part 20 where a cutting blade 20a moves in parallel with the turning shaft 11 to cut open the bag 1. A vibration applying part 17 is added to the machine as required. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a bag-opening method and a bag-opening machine for automatically and continuously opening various powdered or granular raw materials, cereals, and the like that are packed in a bag and taking out the contents.

  Conventionally, construction materials such as cement, sand and gravel, industrial materials such as crushed minerals, and powdered and granular materials such as grains and feeds are transported and stored in strong bags. Yes. The products packed in these bags need to be taken out quickly and reliably at the time of use. Recently, the following items have been proposed as automated bag opening machines.

  For example, in Japanese Utility Model Laid-Open No. 5-92115 (Patent Document 1), an unopened bag on the conveyance path is pushed out to a bag opening position on the base plate, and an unopened bag on the base plate at the bag opening position is A cutting blade that bites in from above, a plurality of biting teeth that pierce the lower surfaces of both ends of the unopened bag, a drive mechanism that moves the base plate up and down, and an unopened bag on the base plate that is descending from the lower center A “bag opening machine” is disclosed in which a bag is cut by a fixed blade that divides and tears the bag.

In the case of this method, all of the fixed blade, the cutting blade, and the holding teeth used to open the bag are special, which is disadvantageous in terms of cost.
Moreover, since the contents fall on the fixed blade due to its structure, there is a risk that the blades may be damaged or worn if the hardness of the contents is high. Furthermore, depending on the contents, there is a risk of corrosion. Furthermore, when the bag opening machine is used for a plurality of types of contents, operations such as cleaning and replacement of the blade may be required.

  On the other hand, in Japanese Utility Model Publication No. 6-44710 (Patent Document 2), a traveling member that requires a cutter and a push-up member that presses an unopened bag against the traveling member are placed on a pair of conveying devices. In addition, a “bag opening machine” is disclosed in which an unopened tare is cut, hooked on a blow-up portion by standing of the conveying device, and the contents are discharged.

In this case, it is necessary to divide the bag into two by the action of only the traveling member attached with the cutter, and it is necessary to give the cutter enough strength to withstand the resistance of the contents. In addition, since the cutting blade has a large area in contact with the contents, the operation is complicated in terms of cleaning. Furthermore, since the divided bag is once hooked from the conveying device to the blow-up portion, there is a disadvantage that it is often unstable when collecting empty bags.
Japanese Utility Model Publication No. 5-92115 Japanese Utility Model Publication No. 6-44710

  The object of the present invention is to solve the above-mentioned problems, endure long-term use without the need for a special blade in the cutter, easy maintenance, and stable and reliable opening. And providing a bag opening machine.

  In order to solve the above-mentioned problem, the invention of claim 1 includes a bag placement posture for supporting and placing a bag (1) before opening, and an opening (1a, 1b) A pair of tables (10A, 10B) capable of taking two postures of the content discharge posture for directing downward, and the bag (1) with respect to each upper surface of the pair of tables (10A, 10B) ) And a cutter part (20) that can open the bag (1) by moving the cutting blade (20a). The bag (1) before opening is placed at a predetermined position across the table (10A, 10B) to be in the temporarily fixed state, and a part of the upper surface of the bag (1) is cut by the cutting blade (20a). After the temporarily fixed state The pair of tables (10A, 10B) are rotated as they are to change the bag opening placement posture to the content discharge posture to discharge the contents (1c) of the bag (1). It is a bag opening method.

  Invention of Claim 2 is a bag opening machine which cut | disconnects the upper surface of the bag (1) which should be opened, and discharges the contents (1c) below, Comprising: One side of the lower surface of the said bag (1) before opening A first table that can be rotated from a bag placement posture for supporting approximately half and can be changed to a content discharge posture for directing the opening (1a) of the opened bag (1) downward. (10A) and the first table (10A) are rotatably coupled, and after opening from the bag placement posture for supporting the other half of the lower surface of the bag (1), A second table (10B) that can be changed to a content discharge posture for directing the opening (1b) of the bag (1) downward, the first table (10A), and the second table A table driving section (13 and the like) for driving the rotation of (10B), and the first table (10 ) And the second table (10B), a bag fixing portion (10a, etc.) that can temporarily fix the lower surface of the bag (1) to a part of the upper surface of the second table (10B) and the cutting blade (20a) are moved. And a cutter driving unit (20b, 21 etc.) for moving the cutting blade (20a), and a cutter unit (20) capable of opening the bag (1) before opening. It is.

  According to a third aspect of the present invention, in the bag opening machine according to the second aspect, the bag fixing portion (10a, etc.) is provided on each of the first table (10A) and the second table (10B). The first table (10A) and the second table (10B) are sucked by sucking the bag (1) by applying a negative pressure through a plurality of suction holes (10a, 10a... 10a). A bag opening machine characterized by being temporarily fixed to the bag.

Invention of Claim 4 is the bag opening machine in any one of Claim 2 or Claim 3,
The first table (10A) or the second table (10B) is provided on one or both of the first table (10A) and the bag (1) together with the bag (1) to facilitate the discharge of the contents (1c) after opening. It is a bag opening machine characterized by including the shaking part (17) which vibrates the said bag (1) via a table (10A, 10B).

As described above, the present invention has the following effects.
(1) A pair of tables, a bag fixing portion that can temporarily fix the lower surface of the bag to each upper surface of the table, and a cutter portion that can open and open the bag are placed on the bag at a predetermined position. After fixing a fixed state and cutting a part of the bag, the table is rotated in the fixed state to discharge the bag contents with the opening of the bag facing downward, so that the bag is completely removed. There is no need to divide it into two, and only the upper surface of the bag may be cut. Therefore, the contents of the bag do not scatter to the cutter or the cutter running member, can withstand long-term use using a general-purpose cutter, and can perform a stable bag opening operation and reliable discharge of the contents. There is an effect.

(2) It is possible to turn from a bag placement posture for supporting one half of the bag before opening to change the content discharge posture to turn the opening of the bag after opening downward. 1 table and the first table are pivotally coupled to each other and rotated from a bag placement posture for supporting the other half of the bag so that the opening of the opened bag is downward. A second table that can be changed to a content discharge posture to be directed, a table drive unit that drives rotation of the tables, and a bag on a part of the upper surface of each of the first table and the second table A bag opening machine that realizes the above-described effect by including a bag fixing portion that can temporarily fix the lower surface of the bag, a cutter portion that can open the bag by moving the cutting blade, and a cutter driving portion Can be provided.

(3) In the bag opening machine, the bag fixing portion is sucked by applying a negative pressure through a plurality of suction holes provided in each table, and the bag is temporarily fixed to the first table and the second table. By doing so, the above-described effect can be obtained easily and reliably.

(4) In the above bag opening machine, the contents of the bag can be added by adding a vibration unit for promoting the discharge of the contents of the bag after opening to an appropriate place on the table, if necessary. Even when the powder is powdery or easily caught on the inner surface of the bag, the above effects can be obtained easily and reliably.

  The best mode for carrying out the present invention will be described below with reference to the drawings and the like with reference to the drawings and the like.

FIG. 1 is an explanatory view (perspective view) showing a main part of an example of a bag opening machine according to an embodiment of the present invention.
FIG. 2 is a front view showing the same part as FIG.
In the bag opening machine of FIG. 1, the bag 1 to be opened is placed across the upper surfaces of the tables 10A and 10B. The mounting position is indicated by a two-dot chain line in the figure.
The tables 10 </ b> A and 10 </ b> B are connected via a common rotation shaft 11. The end of the central axis of the rotating shaft 11 is supported by a pair of opposed struts 12A and 12B, respectively.

In the table 10A, the table 10B side is supported by the rotation shaft 11, and the opposite side is supported by the stopper 15a in the bag placement posture. The stopper 15a protrudes toward the table 10A from the tip of the arm 15 fixed to the main column 12A. The bag placement posture is a posture in which the bag 1 is supported and placed before opening.
Further, the opposite side of the table 10B is supported by a stopper 16 that is fixed to the main support 12A and protrudes toward the main support 12B in the content discharge posture (see FIG. 7). The content discharge posture is a posture in which both the opening 1a on the table 10A side and the opening 1b on the table 10B side of the bag 1 after opening the bag are directed downward in order to discharge the content 1c after opening (FIG. 5). FIG. 6).

The table 10B is supported by the rotating shaft 11 on the table 10A side, and on the opposite side, the gear 13a attached to the rotating motor 13 fixed to the lower surface of the table 10B is inside the gear guide 14 fixed to the main column 12B. It is supported by engaging with a gear portion 14a provided in the.
The rotation motor 13 is controlled by a control unit (not shown). The engagement position of the gear 13a to the gear guide 14 is set so that the upper surface of the table 10B is flush with the upper surface of the table 10A in the bag placement posture (see FIG. 2), and in the content discharge posture, the table 10B rotates 180 degrees or more from the bag placement posture, the lower surfaces of the table 10A and the table 10B come into contact with each other, and the upper surface of the table 10A comes into contact with the stopper 16 (see FIG. 7).

In addition, a large number of through holes 10a, 10a,..., 10a provided on the bag placement surfaces of the tables 10A and 10B are formed on the lower surface of the placed bag 1 by a negative pressure generator (not shown). This is for sucking with negative pressure through the through-holes and temporarily fixing each mounting surface. Manifolds 10b and 10b for distributing the negative pressure to the through holes 10a, 10a... 10a are fixed to the lower surfaces of the table 10A and the table 10B (see FIG. 2).
A notch 10c provided at one corner of the table 10B is for preventing the table 10B from being caught by the stopper 15a during the rotation.

The cutter unit 20 for opening the bag 1a placed on the upper surface of the table 10A or 10B in the bag placement posture includes a cutting blade 20a protruding directly below the case 20c and a built-in self-propelled motor 20b (see FIG. 2). ).
FIG. 3 is an explanatory diagram showing the relationship between the cutter unit 20 and the cutter driving unit.
The cutting blade 20 a is driven by rotation of a self-propelled motor 20 b and a lifting motor 21 built in the cutter unit 20. The elevating motor 21 is built in a case 21c fixed to the outside of the main column 12B.

When the self-propelled motor 20b is rotated, the gear attached to the motor 20b is engaged with the gear portion 34a provided on one side of the rail 24 that guides the traveling of the cutter portion 20, so that the cutting blade 20a is placed on the table. The upper surface of the upper unopened bag can be moved in the opening direction (horizontal direction).
When the elevating motor 21 is rotated, the screw 22a can be rotated about the axis via the bevel gear group 21a and the like, and the block 23a that is screw-engaged with the screw 22a can be moved up and down.

The lifting motor 21 is rotated by rotating the screw 22b around the shaft 22c that is engaged via the bevel gear group 21a and the shaft 22c via the bevel gear group 21b. The mating block 23c can be moved up and down.
In the shaft 22c, the rotating shaft 11 is constituted by a pipe, and the hollow portion of the pipe is penetrated. Both end portions of the shaft 22c are inserted between the inside of the main column 12A and the inside of 12B.
The blocks 23 a and 23 b are fixed to both ends of the rail 24 and support the rail 24. Since the blocks 23a and 23b are always designed to move up and down by the same distance, the cutting blade 20a can be moved up and down to an arbitrary position while keeping the rail 24 horizontal by the rotation of the elevating motor 21.

Next, the operation of the bag opening machine of FIG. 1 will be described with reference to FIGS.
First, when the unopened bag 1 is carried in by a transporter (not shown) and placed at the position shown by the two-dot chain line in FIG. The cutter unit 20 is disposed at the cutting start position on the upper surface of the bag.
At this time, the bag 1 is sucked by negative pressure through the through holes 10a, 10a,..., 10a in contact with the lower surface thereof, and temporarily fixed to the tables 10A and 10B, respectively.
FIG. 4 is a perspective view partially showing an example of this state.
The temporary fixing of the bag 1 is maintained after a series of operations until just before the opened empty bag is removed from the table 10A, 10B.

When the cutter unit 20 moves along the rail 24 from the state shown in FIG. 4, the cutting blade 20 a opens the upper surface of the bag 1.
After the end of cutting, the cutter unit 20 immediately rises with the rail 24 and returns to the state of FIG. 1 so as not to hinder the subsequent operation of the table 10A.
Subsequently, when the rotation motor 13 is rotated and the table 10B is rotated about the rotation shaft 11, the state shown in FIG. 7 is obtained after the states shown in FIGS. At this time, the portion of the bag 1 that is in contact with the table 10B also rotates following the table 10B.

FIG. 5 is a perspective view showing a state in which the upper surface of the bag 1 is cut open, the tip of the table 10B is lowered, and the opening 1a of the bag 1 is greatly opened.
FIG. 6 is a perspective view showing a state in which the back surface of the table 10B is in contact with the back surface of the table 10A. The table 10B continues to rotate from the state of FIG. 6 to the state of FIG. In this state, the back surface of the table 10B is in contact with the tip of the movable portion 17a of the shaking portion 17 attached to the back surface of the table 10A.
FIG. 7 is a perspective view showing a state where the openings 1a and 1b of the bag 1 are completely downward and the contents of the bag 1 are discharged.
When the shaker 17 is actuated and fine vibrations are applied to the tables 10A and 10B when the contents are dropped, the opened bag 1 is shaken and the contents 1c can be dropped onto the discharge guide 30 without any residue. it can.

After the contents of the bag 1 are discharged, when the table 10B is rotated in the reverse direction, the table 10B changes from the state of FIG. 7 to the state of FIG. 4 through the states of FIGS.
The table 10A is lighter with the bag 1 empty, so it naturally tilts to the back side due to the bias of the center of gravity due to the seismic portion 17 attached to the back surface, and easily follows the movement of the table 10B. It rotates until it is stopped by the stopper 15a.
Finally, the negative pressure that temporarily fixed the bag 1 to the tables 10A and 10B is removed, the empty bag is taken out and returned to the state shown in FIG. 1, and the next series of operations can be performed.

In each of the above operations, the control unit (built in the case 21c) receives signals from sensors (not shown) arranged at appropriate positions such as the main struts, arms, guides, etc., and performs information processing. To control the rotation of each table, the movement of the cutter unit, and the like.
In addition, the control unit sends a signal to an external transport device or the like so that unopened bags can be carried in or empty bags can be carried out.

(Modification)
The present invention is not limited to the embodiments described above, and various modifications and changes are possible, and these are also within the equivalent scope of the present invention.
(1) For example, in the above description, as a method for temporarily fixing the bag on the table, a suction force by negative pressure is used, but a method using another holding mechanism may be used.

(2) The means for rotating the table may be operated in two stages by dividing the table driving unit into a first driving unit and a second driving unit, for example, other than the method described above. In this case, after the table 10B is rotated to the position corresponding to FIG. 6 by the first driving unit, the tables 10A and 10B are rotated together by the second driving unit, which corresponds to FIG. State.

(3) In the above description, when the table is rotated, the cutter unit is lifted to avoid contact with the cutter unit and its supporting portion. However, these portions are positioned relative to the table 10A. May be avoided by fixing and rotating together with the table.
(4) In the above explanation, a vibration unit is added in consideration of the case where it is difficult to completely discharge the contents of the bag by its own weight, but if it is not necessary, it is not added. Also good.
In addition, even if the bag on the table 10B side breaks from the cut end due to the weight of the contents, so-called pocket collapse phenomenon can be avoided by providing an auxiliary mechanism on the table 10B side.

(5) In the above description, methods using an external device are assumed to move the unopened bag from the external transfer device onto the table and to carry the empty bag after opening to the outside. A necessary mechanism may be added to the bag opening machine side of the present invention.
In addition, it is easy to carry in and out from the external transport device if the bag placement posture of the table is inclined rather than horizontal, the carry-in side of the unopened bag is raised, and the empty bag carry-out side after opening is lowered. can do.

It is a perspective view which shows the structural example of the principal part of the bag opening machine by the Example of this invention. It is a front view which shows the same part of FIG. It is explanatory drawing (perspective view) which shows the engagement relationship of the cutter part of the bag opening machine of FIG. 1, and its drive part. It is explanatory drawing (perspective view) which shows the state by which the bag has been arrange | positioned in a to-be-cut position. It is explanatory drawing (perspective view) which shows the state in rotation of one table after bag opening. It is explanatory drawing (perspective view) which shows the state which the back surfaces of two tables contact | connect. It is a perspective view which shows the state from which an opening part turns downward and the contents of a bag are discharged | emitted.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bag 10A, 10B Table 11 Rotating shaft 12A, 12B Main support | pillar 13 Rotating motor 14 Rotating guide 20 Cutter part 21 Lifting motor 22a, 22b Screw 24 Rail

Claims (4)

A pair of tables capable of taking two postures, a bag placement posture for supporting and placing the bag before opening, and a content discharge posture for directing the opening generated by cutting the bag downward; ,
A bag fixing portion capable of temporarily fixing the position of the lower surface of the bag with respect to the upper surface of each of the pair of tables;
A cutter unit that can move the cutting blade to open the bag;
Put the bag before opening at a predetermined position across the pair of tables to be in the temporarily fixed state,
After cutting a part of the upper surface of the bag with the cutting blade,
Rotating the pair of tables in the temporarily fixed state to change the bag opening placement posture to the content discharge posture to discharge the contents of the bag;
A bag opening method characterized by. A bag opening machine that cuts the upper surface of the bag to be opened and discharges the contents downward,
The bag can be rotated from a bag placement posture for supporting one half of the lower surface of the bag before opening, and can be changed to a content discharge posture for directing the opening of the bag after opening downward. A first table;
The bag is pivotably coupled to the first table and rotated from a bag placement posture for supporting the other half of the lower surface of the bag so that the opening of the bag after opening is directed downward. A second table that can be changed to the content discharge posture of
A table driving unit for driving rotation of the first table and the second table;
A bag fixing portion capable of temporarily fixing the lower surface of the bag to a part of the upper surface of each of the first table and the second table;
A cutter part capable of opening the bag before opening by moving a cutting blade;
A cutter driving unit for moving the cutting blade;
Including bag opening machine. In the bag opening machine according to claim 2,
The bag fixing portion sucks the bag by applying a negative pressure through a plurality of suction holes provided in each of the first table and the second table, and the first table and the second table. A bag opening machine that is temporarily fixed to a second table. In the bag opening machine according to any one of claims 2 and 3,
Including a vibration unit provided on both or one of the first table and the second table, which vibrates the bag through the table in order to promote the discharge of the bag contents after opening. A bag opening machine.

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