JPS6154653B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a bag mouth opening/closing device constituting a powder bagging machine.

(Prior Art) A suction belt type bag opening device that opens the bag opening to the maximum extent at the outlet side while transporting the bag using a pair of linear endless suction belts is disclosed in Japanese Patent Application Laid-Open No. 74989/1989. ing. This suction belt type bag opening device opens the bag mouth while transporting the bag, and the closing of the bag mouth to insert items into the bag is now done at a separate location outside the bag opening device. ing. Therefore, an extra punch is required to maintain the shape of the opened bag opening, which not only complicates the structure, but also because there is nothing to actively maintain the shape of the bag opening when inserting items into the bag. , the supply of goods becomes uncertain, and
There is a problem in that after the articles are loaded, the bag opening piece is displaced and transferred to the welding device in the subsequent process.

In view of the above-mentioned problems of the prior art, the present applicant invented a suction belt-type bag opening device (hereinafter referred to as "Paper Opening Device") which transfers the bag and opens the bag opening using a pair of endless transfer belts. invention)
and disclosed a solution to the problem (Japanese Unexamined Patent Publication No. 1983-
No. 142115). However, in the previous invention, the arrangement of the through holes of the transfer belt was insufficient in terms of the suction effect of the bags, so the present invention is a further improvement on the previous invention. The present invention will be explained below with reference to FIGS. 1 to 6.

Reference numerals 1 and 1' designate transfer belts that attract and transfer the bags 13, and are provided symmetrically with respect to the traveling line of the bags 13 in plan view, as shown in FIG. Transfer belt 1,
1' is guided in an annular manner by a guide wheel 2 on the entrance side, a guide wheel 3 on the intermediate part, a drive wheel 4 on the exit side, and an air box 5, and the bag opening is opened at a location below the chute input port 8. It is arranged so that powder and granular materials can be input. The pair of transfer belts 1 and 1' are driven by a drive device 6 via the drive wheel 4 in the direction of the arrow shown in FIG. There is.

On the other hand, the transfer belts 1 and 1' have a plurality of air holes 9, and the air box 5 has a plurality of air holes 10 over its entire length on the surface in contact with the transfer belt, as shown in FIG. Furthermore, the air in the air box 5 is sucked in by the air suction pump 12 via the piping part 11. A total of four air boxes 5 are provided, two on the left and right in the direction of travel of the bag, and each air box is provided with an inclined wall 5a in the center to form a bagging section. By arranging the inclined walls 5a symmetrically in a plane, a substantially diamond-shaped bagging space is formed.

Therefore, by aligning the air holes 9 of the transfer belts 1, 1' with the air holes 10 of the air box 5, the air suction pump 12 can be operated to contact the transfer belts 1, 1'. The bag 13 is attracted to the transfer belts 1 and 1' and is transferred together with the transfer belt.

However, when the bag 13 is attracted to the transfer belts 1, 1', the air holes 9 in the areas other than the contact areas between the transfer belts 1, 1' and the bag 13 remain open. Therefore, if air is sucked in from this open air hole, the suction force of the bag suction section will decrease, making it difficult to hold the bag, and if the bag 13 comes off or the opening of the bag opening is insufficient. There is. Therefore, in order to avoid this,
Problems arise, such as the need to increase the capacity of the air suction pump 12.

(Problems to be Solved by the Invention) This invention attempts to solve the above-mentioned problems in the suction belt type bag opening device according to the earlier invention. , which attempts to make it possible to effectively suction the bag with a small-capacity pump.

(Means for solving the problem) A pair of endless transfer belts for conveying bags are set so that their opposing distances are parallel at the entry side and exit side, and the maximum separation distance at the middle part is approximately the width of the bag. The two endless transfer belts are arranged opposite each other so that their planar shapes are diamond-shaped, and a large number of through holes are formed in a group between approximately half the width of the bag. On the opposite sides of both endless transfer belts, an air box having air holes for sucking air through the through-holes of the belts was installed over almost the entire length of each belt.

(Example) This will be explained with reference to FIGS. 7 and 8. It should be noted that, except for the transfer belt itself, the other driving devices and the like are exactly the same as those of the above-mentioned previous invention, so a description thereof will be omitted, and only the structure of the improved transfer belt will be explained below. Although the transport belts 1, 1' are provided with a number of air holes 9, these are not provided over the entire length of the belts 1, 1'. That is, the air holes 9 are provided in groups, and the length in the longitudinal direction of the belt in which the air holes 9 are provided is formed in a section equal to approximately half the length of the bag width. Note that the figure only shows one group of air holes 9, but this air hole 9
There are 2 to 3 suction parts perforated on the belt at equal intervals.
You can work more efficiently if you have these places set up.

Figure 8 further explains this in detail.
The length A of the bag suction part is the length A of the bag 13 and the transfer belts 1, 1'.
The length C of the contact portion is shorter than that of the non-adsorbing portion B, and the non-adsorbing portion B exists on both sides of the adsorbing portion A. As is clear from FIG.
Since there is a process of separating from 1', suppose that the non-adsorption part B
If the air hole 9 is provided in the air hole 9, the atmosphere will be sucked in through the air hole 9, causing the above-mentioned problem. In this embodiment, B≈A/2, and by keeping the size ratio at this level, the above-mentioned problem can be avoided.

It goes without saying that in order to feed the bag 13 to the present apparatus, it is necessary to coordinate and synchronize the movement of the transfer belts 1, 1' so that the bag 13 exactly matches the position shown in FIG. Further, it is preferable that the opposing transfer belts gradually expand so that the maximum separation distance is approximately half the bag width.

(Function) The opening device of the present invention has the above-described configuration, and the bags 13 are fed to the device manually or by an automatic bag feeding machine provided separately. Hereinafter, the operation of the present device will be explained with reference again to FIG. 6, which was used to explain the operation of the previous invention. It should be noted that the holes 9 of the transfer belt in FIG. 6 are of course provided in the relationship shown in FIG. 8.

The supplied bag 13 is continuously transferred to the right (arrow) in the figure by the rotation of the transfer belt while being sandwiched and attracted between the transfer belts 1 and 1' (FIG. 6-a). At this time, hole 9 of the transfer belt...
It is assumed that the correspondence relationship between the groups and the bags 13 is set in advance so that they are transported in the relationship as shown in FIG.

When the bag 13 reaches the part where the gap between the transfer belts 1 and 1' widens, the bag 13 is attracted to the transfer belts 1 and 1', so the bag opening pieces are separated while being transferred, and the bag opening is gradually opened. (Figure 6-
B).

When the mouth of the bag is completely open (Fig. 6-C)
Then, the powder and granular material is charged into the bag 13 through the chute input port 8.

After the loading of the powder and granules is completed, the gap between the transfer belts 1 and 1' begins to narrow, and since the bag 13 is attracted to the transfer belt, the bag opening gradually begins to close together with the transfer belt (FIG. 6-D).

The transfer belts 1, 1' are again in contact and parallel (Fig. 6-E), and the bag opening is connected to the transfer belts 1, 1'.
1' and is completely closed.

When the above series of steps are completed, the bag 13 is transferred to a sealing device for the next step.

The weight of the bag and the powder after the granular material has been introduced is supported by a bag receiving device (not shown) provided below the bag, and is transferred in synchronization with the transfer belts 1, 1'.

(Effects) According to the present invention, the mechanism of the present device integrates the bag transfer mechanism and the bag opening mechanism, making it a much simpler mechanism than conventionally known devices. That is, since the only movable parts are the pair of belts, adjustment, maintenance and inspection are easy, and the device can be provided at low cost.

The endless belt has a large number of through holes formed in a group that spans approximately half the width of the bag, ensuring that the bag is held securely without reducing the suction force of the bag suction unit. There is an advantage that the capacity of the air suction pump does not need to be very large.

Furthermore, the endless transport belt has a large number of through holes formed in a group that spans approximately half the bag width, so even if the timing of supplying bags to the belt holes is slightly off, the transport belt will Since the opening action of the bag opening piece can be performed reliably at the diamond-shaped middle part, there is a great effect that articles can be loaded without any hindrance.

In the above description, the material to be packed into the bag is not limited to powder or granular material, but may of course be liquid material.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the bag opening and sealing device of the previous invention. Figure 2 is a schematic diagram of the plane. FIG. 3 shows a schematic front view thereof. FIG. 4 is a perspective view showing the relationship between the air box and the air suction pump in FIG. 1. FIG. 5 is an exploded perspective view illustrating the relationship between the air box, the transfer belt, and the suction portion of the bag in FIG. 1. FIGS. 6A to 6E are schematic plan views showing the operation mode of the bag according to the previous invention. FIG. 7 is an exploded perspective view showing the improved air box, transfer belt, and suction portion of the bag according to the present invention (only one transfer belt is shown). FIG. 8 is a diagram showing the positional relationship between the air hole and the bag in FIG. 7. In the figure; 1, 1'... transfer belt, 2...
(Entrance side) Guide car, 3... (middle part) Guide car, 4
...(Exit side) Drive vehicle, 5...Air box, 5a...
Inclined wall (of the air box), 6... Drive device, 7... Synchronization mechanism, 8... Chute inlet, 9... Air hole (of the transfer belt), 10... Air hole (of the air box),
11...Piping parts, 12...Air suction pump, 1
3... Bag, 14... Mount.

Claims (1)

[Scope of Claims] 1. A pair of endless transfer belts for conveying bags are parallel to each other at the entry side and exit side, and the maximum separation distance at the middle portion is approximately half the bag width. These endless transfer belts are arranged opposite each other so as to have a rhombic shape in plan view, and a large number of through holes are formed in a group between approximately half the width of the bag. A suction belt type bag opening/closing device characterized in that an air box with air holes for sucking air through the through holes of the belt is installed on the inside of each of the opposite sides of both endless transfer belts over almost the entire length thereof. Device. 2. Claim 1, characterized in that the length of the bag suction part is shorter than the length of the contact part between the bag and the transfer belt, and the non-adsorption parts are present on both sides of the suction part.
The suction belt type bag opening/closing device described in Section 1. 3. The suction belt type bag opening/closing device according to claim 1, wherein a plurality of through holes are provided on the transfer belt in groups at equal intervals.