JPH11169627A - Filter bag for dust collector and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter bag for a dust collector which decreases the number of parts, facilitates automation, allows the drastic reduction in a production cost by mass production and has stabilized quality and durability and a method for producing the same. SOLUTION: The prescribed length L on the one end aperture side of a cylindrical body 8A consisting of filter blanks of three-dimensionally intertwined fibers is expanded in diameter and a diameter expanding part 8e is turned back to the outer side and after an elastic ring 10 for mounting fittable to the annular holder in the dust collector between the folded back part 8f and the cylindrical body 8A, the folded back part 8f and the cylindrical body 8A are stitched and further the other end aperture 8c of the cylindrical body 8A is closed to a bag form.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter bag for a dust collector mounted on a dust collector and a method of manufacturing the same.

[0002]

2. Description of the Related Art FIG. 1 shows the principle of a dust collector generally used widely. In FIG. 1, 1 is a dust collector main body, 2
Is an air supply port, and 3 is an exhaust port, which is connected to the exhaust fan 4. Reference numeral 5 denotes a shell plate which divides the inside of the dust collector body 1 into an intake side 6 and an exhaust side 7. Reference numeral 8 denotes a filter bag which is attached to the opening 5a of the shell plate 5. FIG. 2 shows a mounting structure of the filter bag.
Reference numeral 9 denotes a ring-shaped holder, and reference numeral 10 denotes a mounting elastic ring that can be fitted to the holder, and is fixed to the outside of the opening 8a of the filter bag 8 to prevent air leakage. Reference numeral 11 denotes a cage-like retainer that is closely inserted into the main body 8A of the filter bag 8 from above to prevent the filter bag 8 from contracting inward during intake.

FIG. 6 is a schematic view showing a manufacturing process of a conventional filter bag. As shown in FIG. 6A, the side edges of a filter material such as a rectangular felt are adhered to each other to produce a cylindrical main body 8A. As shown in FIG. Fold the predetermined length on the 8a side outward,
As shown in FIG. 6 (c), after the elastic ring 10 for attachment that can be fitted to the ring-shaped holder 9 in the dust collector is sandwiched between the folded portion 8b and the cylindrical main body 8A, the folded portion 8b is formed.
And the cylindrical main body 8A are sewn. Next, the bottom filter 8d is fitted to the other end opening 8c of the cylindrical main body 8A and sewn, and the other end opening 8c is closed to form a bag.

FIG. 7 is a schematic view showing a process of manufacturing another conventional filter bag. As shown in FIG. 7A, the raw material of the filter material such as a sheet felt is cut so that the fixed lengths at the upper and lower ends are wider than the center.
As shown in (b), the cut piece is folded in two along the axis S, and the folded side edges are sewn or heat-sealed. Thereby, the cylindrical main body 8A whose upper and lower ends are large in diameter is produced. Furthermore, the same raw material is cut into short lengths, and both side edges are sewn or heat-fused in a ring shape, and the upper half is folded back to the outside of the lower half to form an outer portion 12a to form a collar 12 at the mouth. After sandwiching the mounting elastic ring 10 between the portion 12a and the inner portion 12b, as shown in FIG. 7C, the inner portion 12b, the outer portion 12a, and the expanded portion 8e at the upper end of the cylindrical main body 8A are sewn. The bottom filter 8d is fitted to the other end opening 8c of the cylindrical main body 8A and sewn, and the other end opening 8c is closed to form a bag. As a result, the filter bag 8 with the upper end opened and the cage-shaped retainer 11 easily inserted and the mounting elastic ring 10 that can be fitted to the ring-shaped holder 9 mounted thereon is produced.

[0005]

[0006] Of the above two prior arts, in the former, as shown in FIG. 6 (b), a predetermined length of one end opening 8a of the filter bag 8 is turned outward. In addition, wrinkles are generated at a predetermined length located inside the folded portion 8b due to the contraction force of the folded portion 8b, and the inner diameter of the predetermined length at the one end opening 8a side of the filter bag 8 is substantially reduced in diameter. Insertion of the cage retainer 11 becomes difficult. Therefore, when the outer diameter of the cage-shaped retainer 11 is set to be small, a gap is formed between the cage-shaped retainer 11 and the cylindrical main body 8A. And the life is shortened. .

[0006] In the latter, since the cutting of the raw material of the filter material such as a sheet-like felt is not linear, automation is difficult and it is necessary to perform manual operation. In addition, it is necessary to separately form the lip collar 12, which makes mass production difficult, resulting in poor productivity and increased costs.

The present invention is intended to solve such a problem. The number of parts is reduced, automation is easy, the production cost can be largely reduced by mass production, and the quality is stable and durable. An object of the present invention is to provide a filter bag for a dust collector and a method for manufacturing the same.

[0008]

In order to achieve the above object, the present invention has a mounting elastic ring which can be fitted to a ring-shaped holder in a dust collector outside an opening, and a cage-like retainer is provided inside. In an insertable filter bag,
It is made of a filter material in which fibers are entangled three-dimensionally, and is sewn after an expanded portion at one end opening of the cylindrical body is folded outward, and an elastic ring for attachment is provided between the folded portion and the body. A filter bag for a dust collector characterized by being sandwiched.

Further, the present invention provides the filter bag for a dust collector according to claim 1, wherein the filter material in which fibers are entangled three-dimensionally is a felt-like material produced by needle punching of synthetic fibers.

Further, according to the present invention, there is provided a cylindrical body made of a filter material in which fibers are entangled three-dimensionally, the diameter of which is increased by a predetermined length at one end opening side, and the enlarged diameter portion is folded outward, and the folded portion and the cylindrical member are folded. After sandwiching the elastic ring for attachment that can be fitted to the ring-shaped holder in the dust collector between the main body and the main body, the folded portion and the cylindrical main body are sewn, and the other end opening of the cylindrical main body is closed. A method for producing a filter bag for a dust collector, characterized in that the bag is shaped like a bag.

Further, according to the present invention, there is provided a method of manufacturing a filter bag for a dust collector according to claim 3, wherein the three-dimensionally entangled filter material is a felt-like material manufactured by needle punching of synthetic fibers. It is in.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view showing the principle of a dust collector provided with a filter bag, and FIG. 2 is an explanatory view showing a mounting structure of the filter bag. The details thereof have been described in the section of [Prior Art], and a description thereof will be omitted. FIG. 3 is a sectional view showing an example of a filter bag for a dust collector of the present invention,
FIG. 5 is a schematic view showing a manufacturing process of the filter bag of the present invention. In order to produce the filter bag of the present invention, a raw material made of a synthetic fiber filter material such as polypropylene in which fibers are entangled three-dimensionally by a needle punching operation is cut linearly, and the both side edges are overlapped with each other to form a hot melt. By attaching, the cylindrical body 8A of the filter material shown in FIG.
Is obtained. Next, the predetermined length L on the one end opening 8a side of the cylindrical main body 8A is increased in diameter.

FIG. 4 is a principle view showing an example of the diameter expanding device. In the figure, reference numeral 13 denotes a slide core having a conical slope 13a. Numeral 14 denotes an expanding ring which is fitted to the conical slope 13a and is divided into four parts, and is urged toward the center by a spring or the like. 15 is a back plate fixed to the slide core 13, 16 is the back plate 15 and the expansion ring 1
4 is a spring disposed between the spring. The tip 13b of the slide core 13 projects forward from the hole 17a of the partition wall 17, is connected to a piston or the like of an air cylinder (not shown), and can be moved in the direction of the arrow by operating a valve.

In order to expand the diameter by using the above-mentioned apparatus, the tip of the cylindrical body 8A made of a filter material is previously put on the outer periphery of the expanding ring 14, the valve is switched, and the slide core 13 is moved in the arrow direction.
Is moved, the expanding ring 14 is formed by the conical slope 13a.
Is displaced in the radial direction, so that the predetermined length L of the cylindrical main body 8A covered by the expanding ring 14 at the one end opening 8a side is as shown in FIG.
As shown in (b), the diameter is expanded and remains as permanent distortion.

Next, as shown in FIG. 5C, the enlarged diameter portion 8e is folded outward, and the folded portion 8f and the cylindrical main body 8 are folded.
A, after sandwiching an elastic ring for attachment 10 that can be fitted to the ring-shaped holder 9 in the dust collector, the folded portion 8f and the main body 8A are sewn, and the other end opening 8c of the cylindrical main body is further sewn. The bottom filter 8d is aligned and sewn to
Close c to form a bag.

When the filter bag 8 for a dust collector formed as described above is enlarged, it becomes as shown in FIG. 3. However, since the enlarged bulged portion 8e is folded outward, the folded portion 8f is folded closely after the folding. Contacting the main body 8A,
Since the inner diameter at the one end opening 8a side of A is not substantially reduced, as shown in FIG. 2, even if the outer diameter of the cage-shaped retainer 11 is substantially equal to the inner diameter of the cylindrical main body 8A, the cage-shaped retainer is not affected. Since the insertion of 11 is smooth, both dimensions can be made substantially equal. For this reason, there is no rubbing during operation, and therefore, the life of the filter bag 8 for the dust collector is prolonged.

As described above, unlike the conventional one, there is no need to manufacture and sew two members separately, and only the processing of a single member is required, and linear cutting is sufficient, so automation is easy. Therefore, the cost can be greatly reduced to 1/4 or less of the conventional one.

As the material of the filter bag of the present invention, as described above, a filter material of synthetic fiber, such as polypropylene, in which fibers are three-dimensionally entangled by a needle punching operation, is used. Even if the predetermined length L on the side is expanded, the fibers that are three-dimensionally entangled by the needle punching work move relatively and do not recover as permanent distortion, so that the filter bag of the present invention There is no change. If a nonwoven fabric produced by using a woven fabric or an adhesive, or by heat fusion, is used as the material of the filter bag, the fiber will be destroyed at the time of diameter expansion, and the object of the present invention cannot be achieved. Further, knitted fabrics such as tricots are suitable for filters because of their good air permeability, but the purpose of the present invention cannot be achieved because the shape is difficult to maintain.

As means for expanding the diameter of the filter bag material of the present invention, air pressure or the like can be used, but it is preferable to expand the diameter uniformly in the radial direction.

[0020]

The filter bag for a dust collector according to the present invention is constituted as described above, is made of a filter material in which fibers are entangled three-dimensionally, and the expanded portion at one end opening of the cylindrical main body is directed outward. By being sewn after being folded and the elastic ring for attachment being sandwiched between the folded portion and the main body, the folded portion comes into close contact with the main body. Since the inner diameter of the length is not substantially reduced, even if the outer diameter of the cage-like retainer and the inner diameter of the cylindrical main body are almost equal, the insertion of the cage-like retainer is smooth and does not rub during operation. ,
This increases the durability of the filter bag for the dust collector.

In the filter bag for a dust collector according to the present invention, the cylindrical body made of a filter material in which fibers are entangled three-dimensionally has a predetermined length at one end opening side, and the swollen portion extends outward. After sandwiching a mounting elastic ring that can be fitted to a ring-shaped holder in the dust collector between the folded portion and the folded portion and the tubular body, the folded portion and the body are sewn, and the other end of the tubular body is further sewn. By closing the opening and making it into a bag shape,
Unlike the conventional one, there is no need to manufacture and sew two members separately, only a single member needs to be processed, and since linear cutting is sufficient, automation is easy and the conventional
The cost can be greatly reduced to 1/4 or less.

The filter bag for a dust collector and the method of manufacturing the same according to the present invention are characterized in that the filter material in which the fibers are three-dimensionally entangled is a felt-like material manufactured by needle punching of synthetic fibers. Even if the predetermined length L on the one end opening 8a side of the 8A is expanded, the fibers that are three-dimensionally entangled by the needle punching work relatively move and do not become permanent distortion and are not restored. The filter bag does not change over time.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing the principle of a dust collector provided with a filter bag.

FIG. 2 is an explanatory diagram showing a mounting structure of a filter bag.

FIG. 3 is a sectional view showing an example of a filter bag for a dust collector according to the present invention.

FIG. 4 is a principle view showing an example of a diameter expanding device.

FIG. 5 is a schematic view showing a manufacturing process of the filter bag of the present invention.

FIG. 6 is a schematic view showing a manufacturing process of a conventional filter bag.

FIG. 7 is a schematic view showing another manufacturing process of a conventional filter bag.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dust collector main body 2 Air supply port 3 Exhaust port 4 Exhaust fan 5 Shell plate 5a Opening 6 Intake side 7 Exhaust side 8 Filter bag 8A Cylindrical main body 8a One end opening 8b Folding part 8c Other end opening 8d Bottom filter 8e Expansion diameter Part 8f Folded part 9 Ring holder 10 Elastic ring for attachment 11 Cage-like retainer 12 Mouth collar 12a Outer part 12b Inner part 13 Slide core 13a Conical slope 14 Expanding ring 15 Back plate 16 Spring 17 Partition 17a Hole

Claims (4)

[Claims] 1. A filter bag which has a mounting elastic ring outside the opening, which can be fitted to a ring-shaped holder in a dust collector, and into which a cage-like retainer can be inserted.
It is made of a filter material in which fibers are entangled three-dimensionally, and is sewn after an expanded portion at one end opening of the cylindrical body is folded outward, and an elastic ring for attachment is provided between the folded portion and the body. A filter bag for a dust collector, which is sandwiched. 2. The filter bag for a dust collector according to claim 1, wherein the filter material in which the fibers are three-dimensionally entangled is a felt-like material manufactured by needle punching of synthetic fibers. 3. A cylindrical body made of a filter material in which fibers are entangled three-dimensionally, the diameter of which is increased by a predetermined length on one end opening side,
After turning the bulging portion outward, sandwiching a mounting elastic ring that can be fitted to the ring-shaped holder in the dust collector between the turning portion and the cylindrical main body, the above-mentioned folded portion and the cylindrical main body are sewn. A method for manufacturing a filter bag for a dust collector, further comprising closing the other end opening of the cylindrical body to form a bag. 4. The method for producing a filter bag for a dust collector according to claim 3, wherein the filter material in which the fibers are entangled three-dimensionally is a felt-like material produced by needle punching of synthetic fibers.