JP3176809B2 - Bag filter retainer and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter cloth support frame (hereinafter referred to as "retainer") for a pulse jet type bag filter and a method for producing the same.

[0002]

2. Description of the Related Art In general, in a bag filter type dust collector that performs backwashing using a pulse jet, a frame structure for supporting the filter cloth is provided inside a filter cloth sewn in a cylindrical or envelope shape (flat cylindrical shape). A retainer is provided
(For example, Mechanical Engineering Handbook C Engineering C8-30 8
9,10).

Conventionally, the retainer of this bag filter is made of a wire such as a steel wire in a tubular shape so that dust-containing gas can be filtered from the outside to the inside of the filter cloth. The filter cloth is disposed along the vertical direction so that dust on the outer surface of the filter cloth can be removed by a pulse jet injected into the filter cloth. Specifically, it is composed of a plurality of vertical wires extending in the vertical direction provided in a cylindrical shape with each other, and a ring-shaped wire connecting the vertical wires in some places. Further, in the conventional method of manufacturing a retainer, a ring is made of a wire such as a steel wire, a plurality of rings are arranged in a straight line so as to face each other, and then vertical wires are provided at predetermined angles on the outer periphery of these rings. Thereafter, flash butt welding is applied to the intersection of the ring and the vertical wire.

[0004]

However, since the galvanized wire SWM-G1 (JIS G 3532) is generally used as the wire (material) constituting the above-described retainer, for example, a coal drying facility is used. When a dust collector is used, there is a problem that the retainer is corroded and damaged in a short period of time due to sulfur components contained in the coal, and a hole is formed in the filter cloth. In order to solve this drawback, a stainless steel wire having good corrosion resistance may be used instead of a galvanized iron wire, but the cost of the retainer increases.

In the conventional manufacturing method, a three-dimensional welding operation is required to weld and join a vertical wire to an outer periphery of a ring made of a wire such as a steel wire. Since the operations such as distortion prevention and correction are also three-dimensional, there is a problem that the manufacturing operation is very troublesome and requires skill.

Further, when the retainer is long, it is made by joining several divided bodies. At the joint between the divided bodies, since the wires are butt-welded, the spatter generated by welding is cut. Rework such as processing was required.

An object of the present invention is to solve the above-mentioned disadvantages of the prior art and to provide a long-life and inexpensive bag filter retainer.

Another object of the present invention is to provide a manufacturing method capable of easily producing an inexpensive retainer with a long service life.

[0009]

In order to achieve the above object, the present invention has been made based on the finding that aluminum-coated steel wires (steel wires coated with aluminum) are excellent in terms of life and cost against sulfur components. It was made based on it. That is, in a retainer of a bag filter formed by joining a plurality of wires in a cylindrical shape, an aluminum-coated steel wire is used as the wire.

In the method of manufacturing a retainer according to the present invention, a lattice body is formed by arranging aluminum-coated steel wires side by side so as to be orthogonal to each other, and then the lattice body is formed into a cylindrical shape by bending. Things.

Here, when the retainer is made by joining a plurality of divided bodies, at the joint between the divided bodies, the ends of the aluminum-coated steel wires of both divided bodies are inserted into the sleeve from both sides,
Preferably, the sleeve is swaged.

[0012]

The present inventors conducted exposure tests of some materials in an exhaust gas dust collector in a coal drying facility. The result is shown in FIG. As shown in the figure, the corrosion resistance of the material is stainless steel (SUS)> aluminum (A
l)> Zinc (Zn). Also, it was found that austenitic SUS304 also suffered from intergranular cracking in stainless steel, and it could not be used sufficiently unless expensive duplex stainless steel (SUS 329 J2L) was used. From the above viewpoints, when a steel wire coated with aluminum (aluminum-coated steel wire) was adopted as the wire material of the retainer, a long-life and inexpensive retainer could be obtained.

In the case of manufacturing a retainer using aluminum-coated steel wires, a plurality of aluminum-coated steel wires are juxtaposed so as to be orthogonal to each other to form a flat grid, and this grid is formed into a tubular shape by bending. Then, work such as temporary assembly, welding, distortion prevention, etc. can be performed two-dimensionally.

In the case where the retainer is made of a plurality of divided bodies, the ends of the aluminum-coated steel wires of the adjacent divided bodies are inserted into the sleeve from both sides, and the sleeve is crimped. The divided bodies can be easily joined to each other without performing butt welding between them. In addition, since there is no spatter generated by welding, there is no need for rework.

[0015]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1A, reference numeral 1 denotes a cylinder or an envelope.
This is a retainer for supporting a (flat cylindrical) filter cloth (not shown), and is provided in the dust collector along the vertical direction as shown in the figure. The retainer 1 is divided in advance along the axial direction (vertical direction) by a predetermined length, and is configured by joining a plurality of divided bodies 1a, 1a. Each divided body 1a is formed in a substantially cylindrical shape by a plurality of wires, that is, a plurality of vertical wires 2, 2,... Extending in a vertical direction and ring-shaped wires 3, 3,. The ring-shaped wires 3 are for connecting the vertical wires 2, 2,... To each other, and are arranged facing each other at a predetermined interval in the vertical direction. The vertical wires 2, 2,...
Are attached at predetermined angles on the outer circumference of the ring-shaped wires 3, 3,..., Thereby forming a cylindrical shape as a whole.

In the retainer 1 of the present invention, an aluminum-coated steel wire is used as the vertical wire 2 in order to improve corrosion resistance against sulfur components, and an aluminum-coated steel wire is also formed into a ring-shaped wire 3 in an annular shape. That is used. The aluminum covered steel wires 2 and 3 are shown in an enlarged scale in FIG.
The outer periphery of the steel wire 4 is coated with aluminum 5,
Here, the outer diameter D = 3.5 mm, and the thickness t of the aluminum layer t = 9.
Although a diameter of 0 μm is used, the outer diameter D of the aluminum-coated steel wires 2 and 3 and the thickness t of the aluminum layer are appropriately selected according to the corrosive environment and purpose.

FIG. 3 is an enlarged view of the joint between the divided bodies 1a, 1a, and FIG. 2 is an end view thereof. As shown in FIG. 3, a plurality of aluminum sleeves 8, 8,... Are provided at a joint B between the divided bodies 1a, 1a, and a plurality of vertical wires (aluminum-coated steel wires) of the divided bodies 1a, 1a are provided. 2, 2, ... are butt-joined in the sleeve 8. In this joint portion B, in order to prevent the separated bodies 1a, 1a from being detached from each other, the vertical wires 2 of the divided bodies 1a, 1a are used.
Of the 2..., 3/4 of the vertical wires 2, 2... Are joined together in the sleeve 8, and the remaining 1/4 of the vertical wires 2, 2. Has formed. That is, these 1
/ 4 vertical wire members 2, 2 ... are divided bodies 1 on the other side (upper and lower)
1a, it is extended to the first ring-shaped wire 3 and its extended end is bent over the ring-shaped wire 3 and inwardly. In this example, as shown in FIG. 2, of the total of 16 vertical wires 2, 2,..., 12 vertical wires 2, 2,. Wire rod 2,2
The terminal of ... is bent inward.

As described above, the retainer 1 of the present embodiment employs the aluminum-coated steel wire as the vertical wire 2 and the ring-shaped wire 3, so that a long-life and inexpensive retainer can be obtained. Table 1 below is a table in which the retainer 1 was prototyped using various types of wire rods, and the specifications, life, and cost of these prototypes were compared.

[0020]

[Table 1]

As is clear from the table, the life of the retainer made of aluminum-coated steel wire is about 3 times longer than that of the retainer made of Zn-plated steel wire.
The cost has hardly risen while it has doubled. Also, compared to Al wire and SUS 329 J2L retainer,
The cost has been reduced to less than 1/3. As described above, it is understood that the use of the aluminum-coated steel wires as the wires 2 and 3 of the retainer 1 can provide a long-life and inexpensive retainer 1.

At a joint B between the divided bodies 1a, 1a, a predetermined number of vertical wires (aluminum-coated steel wires) 2, 2,... , 2... Are connected to the ring-shaped wire 3 of the counterpart split body 1 a
, Can be prevented from falling off during use without the vertical wires 2, 2,... Falling out of the sleeve 8 even if the sleeve 8 becomes loose.

Next, a method of manufacturing the retainer 1 having the above structure will be described.

First, as shown in FIG. 4 (a), aluminum-covered steel wires 2, 2,... Serving as vertical wires are arranged side by side at an interval from each other, and then, aluminum-covered steel wires serving as ring-shaped wires are placed thereon. Lines 3,3
Are arranged side by side so as to be orthogonal to the aluminum-coated steel wires 2, 2,. Then, welding is performed on the intersecting portions E, E,... Of these aluminum-coated steel wires 2, 3 using a multipoint automatic welding machine, and a flat lattice body 11 is formed.

Next, the lattice body 11 is subjected to a bending process by a press and formed into a cylindrical shape. In this embodiment, FIG.
After the lattice body 11 is formed into a semi-cylindrical shape as shown in FIG.
As shown in (c), a pair of molded products 12 are joined to each other to form a cylinder. The joining of the molded products 12, 12 is performed by the aluminum-covered steel wires 3a, 3 which have become semicircular by the bending process.
This is performed by inserting the end portions of a into the sleeves 7 made of aluminum from both sides, abutting the end faces of the aluminum-coated steel wires 3a, 3a, and then caulking the sleeves 7, 7.

When the substantially cylindrical divided body 1a is obtained in this manner, a plurality of divided bodies 1a, 1a,... Are arranged in a straight line, and as shown in FIG. 1a, 1
a Join each other. When the divided bodies 1a, 1a are joined to each other, the ends of a predetermined number of the vertical wires 2, 2,... Of the vertical wires 2, 2,. Are inserted, the end faces are butted together, and the sleeves 8, 8,... Are swaged. .. Are bent inward so as to straddle the ring-shaped wire 3 of the divided body 1a on the other side to form a bent portion 9.

Thus, the plurality of vertical wires 2, 2... Of the divided bodies 1a, 1a are joined to each other, and the retainer 1 having a long structure is obtained.

In the manufacturing method of the present embodiment described above, the aluminum-coated steel wires 2 and 3 are joined in a grid shape to form a grid body 11.
After forming the grid, the lattice body 11 is bent and formed into a cylindrical shape, so that work such as temporary assembly of the retainer, welding, and distortion prevention can be performed in a two-dimensional manner, as in the conventional case. Since it is not necessary to perform the operation three-dimensionally (three-dimensionally), the manufacturing operation becomes extremely easy.

In addition, when the grid body 11 is manufactured, the aluminum-coated steel wires 2 and 3 may be welded side by side in a grid, so that a multipoint automatic welding machine can be used, and the welding time can be greatly reduced. it can.

When the divided bodies 1a are joined together, the aluminum-coated steel wires 2, 2... Of the divided bodies 1a, 1a are inserted into the sleeves 8, 8,. As a result, a long retainer can be easily manufactured without performing flash butt welding as in the related art. Moreover, since spatters generated by welding can be eliminated, rework such as cutting of spatters is not required.

[0031]

In summary, according to the present invention, the following excellent effects are exhibited.

(1) According to the retainer of the present invention, since an aluminum-coated steel wire is used as a wire constituting the retainer, a long-life and inexpensive retainer can be obtained.

(2) According to the method of manufacturing a retainer of the present invention, since a lattice body made of aluminum-coated steel wire is prepared, and this lattice body is bent and formed into a cylindrical shape, most of the production work is performed in a planar manner. And these operations become extremely easy.

(3) At the joint between the divided bodies, a plurality of aluminum-coated steel wires are joined to each other using a sleeve, so that a long retainer can be easily manufactured and cutting of spatter generated by welding, etc. This eliminates the need for rework.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of a retainer of the present invention.

FIG. 2 is an enlarged view showing a circumferentially joined state of the retainer of the present invention.

FIG. 3 is an enlarged view showing a state in which the retainer of the present invention is joined in the axial direction.

FIG. 4 is a view showing one embodiment of a method for manufacturing a retainer of the present invention.

FIG. 5 is a diagram showing the results of an exposure test in a coal drying facility.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Retainer 1a Divided body 2 Vertical wire (aluminum-coated steel wire) 3 Ring-shaped wire (aluminum-coated steel wire) 7, 8 Sleeve 11 Grid body 12 Molded product

Continuation of the front page (56) References Japanese Utility Model Sho 58-91414 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name)

Claims (4)

(57) [Claims] 1. A bag filter retainer formed by joining a plurality of wires in a cylindrical shape to each other, wherein an aluminum-coated steel wire is used as the wire. 2. A bag filter retainer comprising a plurality of wires joined to each other to form a cylindrical divided body and a plurality of divided bodies joined to each other in a straight line. A retainer for a bag filter, wherein a covered steel wire is used and a plurality of aluminum covered steel wires of adjacent divided bodies are butt-joined in a sleeve. 3. A method of manufacturing a retainer for a bag filter, comprising forming a grid by forming aluminum-coated steel wires side by side so as to be orthogonal to each other, and forming the grid by bending. . 4. An aluminum-coated steel wire is juxtaposed so as to be orthogonal to each other, and is formed into a tubular shape by bending to form a divided body. A method for manufacturing a retainer for a bag filter, comprising inserting ends of an aluminum-coated steel wire of each divided body into a sleeve from both sides and then caulking the sleeve.