JPH0311448Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a structure for mounting a dust collecting plate in an electrostatic precipitator.

[Conventional technology]

For example, in the upper mounting portion of a dust collecting plate in a dust collecting device, the dust collecting plate 1 is fastened to a mounting fitting 3 with flat bolts 2 (hereinafter referred to as bolts) and nuts 4, as shown in FIG. The mounting bracket 3 has a tapered part 3a and a hole 3b machined therein, and the mounting bracket 3 has an insertion hole for the bolt 2, which is machined in advance at the tightening position of the dust collector plate 1, and a tapered part 3a of the mounting bracket 3. Tapered part 1a with a gentler angle (for example, about 120° when the angle of the mounting bracket 3 is 90°)
are overlapped and tightened with bolts 2 and nuts 4 to secure them. The tapered shape of the tightening portion is designed to withstand the vertical dust collector plate load and the horizontal hammer impact load, and frictional joining is also possible by using, for example, high tension bolts.

[Problems that the idea aims to solve]

However, when tightening the dust collection plate 1 mentioned above,
When the hammering part (not shown) of the dust collecting plate 1 is hammered to remove dust attached to the dust collecting plate 1, an out-of-plane bending load acts on the dust collecting plate 1, causing the corner part A
The problem was that fatigue failure occurred. (Hammering is perpendicular in the figure) In addition, in the above-mentioned friction welding, it is necessary to insert a washer under the bolt head and tighten it in order to secure the friction welding area. However, the problem was that the entire dust collection device became large.

This invention was proposed to solve these problems, and its purpose is to remove the dust attached to the dust collection plate even if the dust collection plate is hammered. It is an object of the present invention to provide a dust collector plate mounting structure which can prevent the mounting portion of the dust collector plate from suffering fatigue failure due to an out-of-plane bending load and can increase the mounting strength of the dust collector plate.

[Means for solving problems]

In order to achieve the above object, the present invention forms a conical pressed part on the dust collecting plate of an electrostatic precipitator, forms a bolt insertion hole in the center of this pressed part, and A mounting hole with a tapered surface that overlaps the press-formed part is formed in the dust collecting plate mounting part of the device, and the dust collecting plate is fixed to the dust collecting plate by tightening bolts and nuts inserted through these mounting holes and bolt insertion holes. In the mounting structure of the dust collection plate fixed to the mounting part, the tightening bolt has a head having a seat surface that applies a tightening force to the plate part of the dust collection plate, and a tapered shape on the seat surface of the head. The present invention includes a threaded portion coupled via a tapered portion, and a groove portion formed along the circumferential direction of the tapered portion at a joint portion between the tapered portion and the seat surface portion.

[Effect]

In this invention, when the tightening bolt is tightened with a nut, the tightening force of the tightening bolt acts on the plate part of the dust collection plate, so the dust collection plate can be firmly attached to the dust collection plate mounting part of the electrostatic precipitator. be able to. Therefore, even if the dust collection plate is hammered to remove dust attached to the dust collection plate, the attachment part of the dust collection plate will not suffer fatigue failure due to an out-of-plane bending load, and the dust collection plate can increase the installation strength of the In addition, in the present invention, a groove is formed along the circumferential direction of the tapered part at the joint between the tapered part and the seat of the tightening bolt, so that the pressed part of the dust collector plate is attached to the seat of the tightening bolt. The pressed part of the dust collector plate can be brought into close contact with the tapered surface of the mounting hole, and the load in the vertical direction of the dust collector plate can be supported by the tapered surface of the mounting hole. be able to.

〔Example〕

The present invention will be explained below based on the embodiment shown in FIG.

In the figure, numeral 11 is a dust collector plate, 12 is a special flathead bolt (hereinafter referred to as special bolt), 13 is a mounting bracket (dust collector plate attachment part), and 14 is a nut.

The dust collecting plate 11 is fixed to the mounting bracket 13 with special bolts 12. A mounting hole 13b is formed in this mounting fitting 13, and a tapered surface 13a is formed at one end of the mounting hole 13b. The dust collecting plate 11 is formed with a conical press section 11a that overlaps the tapered surface 13a of the mounting hole 13b, and a bolt insertion hole 11b is formed in the center of the press section 11a.

The special bolt 12 consists of a threaded portion 12d and a head 12a connected to one end of the threaded portion 12d via a tapered portion 12b. Seat part 1 that gives
2e is formed. Further, a groove 12c is formed along the circumferential direction of the tapered portion 12b at the joint portion between the tapered portion 12b and the seat portion 12e of the bolt 12, and the seat portion 12e of the bolt 12 is connected to the corner portion of the dust collecting plate 11. C (plate part 11b of dust collection plate 11
and the press-formed portion 11a). In addition, the head 1 of the bolt 12
2d has a spherical shape except for the seat portion 12e so that the dust collecting plate 11 is not affected by the distance from the discharge electrode (not shown). Further, the radius of curvature R and the width t of the head 12a are determined by the distance between the dust collector plate 11 and the discharge electrode.

In one embodiment of the present invention configured as described above, when the bolt 12 is tightened with the nut 14,
The tightening force of the tightening bolt 12 is the plate part 1 of the dust collection plate 11.
1b, the dust collecting plate 11 can be firmly attached to the mounting bracket 13 of the electrostatic precipitator. Therefore, even if the dust collecting plate 11 is hammered to remove dust attached to the dust collecting plate 11, the attachment portion of the dust collecting plate 11 will not suffer fatigue failure due to an out-of-plane bending load. The mounting strength of the dust collecting plate 11 can be increased.

Further, in the above embodiment, the tapered portion 12 of the bolt 12
A tapered portion 12b is provided at the joint between b and the seat surface portion 12e.
Since the groove part 12c is formed along the circumferential direction of the dust collecting plate 11, the pressed part 12a of the dust collecting plate 11 is not deformed by the seat surface part 12e of the tightening bolt 12, and the dust collecting plate 11 is Press processing section 11
a can be brought into close contact with the tapered surface 13a of the mounting hole 13b, and the load in the vertical direction of the dust collector plate 11 can be supported by the tapered surface 13a of the mounting hole 13b.

The dust collecting plate 11 fixed as described above has a hammering part (not shown) to remove the attached dust.
is hammered, but at this time an out-of-plane bending load acts on the dust collection plate 11. In the conventional mounting structure, the bending load was applied to the corner part (A in Figure 2), which is the stress concentration part of the dust collector plate, but in the present invention, the bending load is applied to the head toe part B of the special bolt 12. This causes stress concentration to be relieved from the corner portions, and as a result, the fatigue strength of the upper part of the dust collector plate is improved.

Next, regarding the fatigue strength mentioned above, the experimental results are shown in the third section.
This will be explained based on the diagram.

In the figure, ○ indicates the conventional example, ● indicates the embodiment of the present invention, and the fatigue strength of the conventional example is as follows:
It is confirmed that the bending moment amplitude is 0.25 [Kg-m], and in the case of the present invention, it is 0.5 [Kg-m], which is a significant improvement.

[Effect of idea]

As described above, according to the present invention, even if the dust collection plate is hammered to remove dust attached to the dust collection plate, the attachment part of the dust collection plate will not suffer fatigue failure due to out-of-plane bending load. There is no problem, and the installation strength of the dust collection plate can be increased.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the upper part of the dust collector plate showing an embodiment of the present invention, Figure 2 is a cross-sectional view of the upper part of the conventional dust collector plate, and Figure 3 is the fatigue strength of the present invention and the conventional example. FIG. 2 is a diagram showing experimental results. 11...Dust collection plate, 12...Special bolt, 13
...Mounting bracket, 14...nut.

Claims (1)

[Scope of utility model registration request] A conical pressed part is formed on the dust collecting plate of the electrostatic precipitator, and a bolt insertion hole is formed in the center of this pressed part, and the said pressed part is formed on the dust collecting plate mounting part of the electrostatic precipitator. A mounting structure for a dust collecting plate in which a mounting hole is formed with a tapered surface overlapping with the part, and the dust collecting plate is fixed to the dust collecting plate mounting part by tightening bolts and nuts inserted through these mounting holes and bolt insertion holes. In the above, the tightening bolt includes a head having a bearing surface that applies a tightening force to the plate portion of the dust collecting plate, and a threaded portion connected to the bearing surface of the head via a tapered portion. . A dust collector plate mounting structure, comprising: a groove portion formed along the circumferential direction of the tapered portion at a joint portion between the tapered portion and the seat surface portion.