JP3610677B2 - Rotating brush for moving electrode type electrostatic precipitator and method for manufacturing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotating brush of a moving electrode type electrostatic precipitator that contacts a surface of an object while rotating and scrapes off dust and the like, and a method of manufacturing the rotating brush.
[0002]
[Prior art]
In a thermal power plant or the like, a moving electrode type electric dust collector is used as a device for removing dust such as soot from combustion exhaust gas. In this moving electrode type electrostatic precipitator, a dust collecting electrode is composed of a plurality of strip-shaped electrode plates, and these plate electrodes are connected to form a loop by a chain, and these electrode plates are circulated, The dust collected on the surface through a pair of rotating brushes arranged in the middle of the is scraped off by the rotating brush. And the rotary brush used for this electrostatic precipitator is the structure which implanted the brush element wire used as brush hair in the brush hole, and was formed like FIG.
[0003]
First, as shown in FIG. 5 (1), the bent portions of a plurality of brush strands 10 folded in two are bundled with a wire 14 or the like, and the wire 14 is moved upward into the flanged metal sleeve 12 via the wire 14. Then, the bent portion of the brush wire 10 is inserted, and the wire 14 is used to prevent it from coming off, and then the upper portion of the sleeve 12 is crimped to fix the brush wire 10 to the sleeve 12 to form the brush unit 15. After that, as shown in FIG. 8 (2), the brush unit 15 is inserted from below into the flocked hole 18 that has been drilled in the half pipe 16 at a predetermined pitch in a spiral shape, and then a pair of half pipes. 16 is fixed to the rotating shaft 20 by welding.
[0004]
[Problems to be solved by the invention]
However, the above-described rotating brush has the brush unit 15 configured in a sleeve unit, and it is necessary to attach about 2000 brush units 15 to one rotating brush, which not only has a large number of parts but also a lot of labor and man-hours. And the cost is high. In addition, when the brush unit 15 is inserted into the half pipe 16, in order to prevent the brush strand 10 from spreading, it is necessary to bundle the tip of the brush strand 10 with an adhesive tape or the like. Bundling with tape or unwinding it is very troublesome, and there is a risk of damaging the brush element wire 10. Moreover, since the conventional rotating brush is embedded by inserting the brush unit 15 from the inside, it requires a half pipe 16 that is fixed around the rotating shaft 20, and the brush is large and heavy. There is. Therefore, it is conceivable that the brush element wire 10 is implanted in a long channel material, and this channel material is welded and fixed to the surface of the rotating shaft.
[0005]
However, the rotating brush used in the moving electrode type electrostatic precipitator is made of stainless steel having a brush element wire 10 having a thickness of about 0.15 mm. The brush element wire 10 becomes brittle due to heat, and the broken brush element wire 10 is mixed in dust (fly ash) that has been broken and scraped off during use. For this reason, the brush strands 10 mixed in the fly ash are bitten into the fly ash discharge, transporting device, and the like, causing damage. Further, fly ash is reused as a raw material for cement, and when iron which is undesirable for cement is mixed in fly ash, it becomes difficult to reuse fly ash.
[0006]
The present invention has been made to eliminate the drawbacks of the prior art, and provides a rotating brush for a moving electrode type electrostatic precipitator that is easy to manufacture and hardly breaks, and a method for manufacturing the rotating brush. It is aimed.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a rotating brush of a moving electrode type electrostatic precipitator according to the present invention is a rotating brush in which a large number of brush strands are arranged on the peripheral surface of the rotating shaft. It has a brush unit welded and fixed at intervals in the circumferential direction , the brush unit is formed with a space in the bottom corner portion of the channel-shaped support frame in which a large number of stainless steel brush elements are implanted, The outer surface of the bottom corner is intermittently spot- welded to the rotating shaft along the longitudinal direction .
[0008]
In the method of manufacturing the rotating brush of the moving electrode type electrostatic precipitator according to the present invention, a number of stainless steel brush wires are implanted so that a space is formed in the bottom corner portion of the concave support frame. The support frames in which brush wires are implanted are arranged at intervals in the circumferential direction of the rotating shaft, and the outer surfaces of the bottom corner portions forming the space are mutually arranged in the circumferential direction of the rotating shaft. It is configured to weld at intervals .
[0009]
[Action]
Since the present invention configured as described above is adapted to weld a channel-shaped support frame in which a large number of brush wires are implanted to the surface of the rotary shaft, the number of parts can be greatly reduced, The number of steps for attaching the brush wire to the rotating shaft can be reduced, and the rotating brush can be easily manufactured, and the cost can be reduced. In addition, since the bottom corner portion where the void of the support frame is formed is welded to the rotating shaft, the welding heat is not easily transmitted to the brush strand, and thermal damage to the brush strand due to the welding heat can be avoided. Therefore, it is possible to prevent the occurrence of hair breakage during use, and it is possible to prevent the broken brush element from being mixed into the fly ash and damaging the ash transport device, thereby preventing the ash reuse. can do.
[0010]
Also, if the outer surface of the bottom corner portion is intermittently welded in the form of dots along the longitudinal direction of the support frame, when the brush unit is long, the middle portion of the brush unit may be displaced when it comes into contact with the object. It can prevent bending. In addition, by performing spot welding, it is possible to reduce the influence of welding heat on the brush strands, and to prevent deterioration of the brush strands. In order to firmly fix the brush unit to the rotating shaft, for example, when both ends of the brush unit are continuously welded, if the portion of the brush wire corresponding to the welded portion is removed in advance, a large welding heat is generated. Even if it is added to the brush unit, there is no brush element wire in that portion, so the brush element line is not damaged.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of a rotating brush of a moving electrode type electrostatic precipitator according to the present invention and a manufacturing method thereof will be described in detail with reference to the accompanying drawings.
[0012]
FIG. 2 is a schematic view of a rotating brush according to the present invention.
In FIG. 2, the rotating brush 30 has four brush units 34 (34 a, 34 b) wound around a rotating shaft 32 in a spiral shape. Each brush unit 34 has a structure in which a large number of brush wires are planted in a long channel-shaped support frame, as will be described in detail later. Further, the rotary shaft 32 has a structure in which a support shaft 38 is fixed to both ends of a pipe-shaped shaft main body 36, and the weight is reduced. One support shaft 38 is rotatably supported by a frame or the like via a bearing (not shown), and the other support shaft 38 is connected to a drive motor (not shown) that rotates the rotating brush 30. The four brush units 34 are arranged at regular intervals of 90 degrees in the circumferential direction with respect to the axis of the rotary shaft 32, and as will be described in detail later, at least both ends are welded around the shaft body 36. It is fixed to the surface.
[0013]
Further, as shown in FIG. 2, the winding direction of the brush unit 34 on the shaft main body 36 is different between the left side and the right side of the central portion of the shaft main body 36. When contacting the moving electrode of the apparatus, the force that moves the rotating brush 30 in one direction of the axial center is prevented from acting. That is, in the rotating brush 30, each brush unit 34a on the left side from the center of the shaft body 36 in FIG. 2 is wound clockwise (clockwise) when viewed from the axial center direction of the rotating shaft 32, and the right side from the center. Each brush unit 34b is wound counterclockwise (counterclockwise).
[0014]
As shown in FIG. 1A, each brush unit 34 has a support frame 40 and a large number of brush strands 42, and the brush frames 42 are sandwiched by the support frame 40. The support frame 40 is made of a metal such as a stainless steel plate, for example, and has a concave shape in front view before the brush element wire 42 is sandwiched, that is, in an initial state, in a direction perpendicular to the paper surface in FIG. It is formed into an elongated object that extends. On the other hand, the brush wire 42 is made of, for example, a thin stainless steel wire having a diameter of about 0.15 mm, and the folded portion is folded in the support frame 42 with the core wire 44 having an appropriate thickness. It is inserted from the upper opening and is installed in the support frame 40.
[0015]
In other words, the support frame 40 in which the bent portion of the brush element wire 42 is disposed is caulked at the upper end portion to prevent the brush element wire 42 from being pulled out, and sandwiches the upper portion of the bent portion of the brush element wire 42. doing. When caulking, the support frame 40 and the brush element wire 42 are positioned so that the brush element wire 42 does not exist at the corners on both sides of the bottom part in the support frame 40, and the support frame 40 is caulked and brushed. When the strand 42 is implanted, a space 46 is formed in the bottom corner portion of the support frame 40, and when welding the brush unit 30 to the rotary shaft 32, welding heat is not easily transmitted to the brush strand 42, and the brush The wire 42 can be prevented from deteriorating.
[0016]
That is, the brush unit 34 is welded and fixed to the rotating shaft 32 via the support frame 40, but the support frame 40 is welded to the support frame 40 as shown as a welded portion 48 in FIG. The outer surface of the bottom bent portion 50 of the support frame 40 that is the outside of the formed space 46 is fillet welded. For this reason, the space formed between the support frame 40 of the welded portion and the brush element wire 42 can prevent welding heat from being directly transmitted to the brush element wire 42, and the brush element wire 42 is deteriorated by the welding heat. Can be prevented. In this embodiment, as shown in FIGS. 1 (2) and (3), the support frame 40 is continuously extended over a certain length (for example, 20 mm) at both ends in the longitudinal direction by TIG welding or the like. And is firmly fixed to the rotary shaft 32 by the continuous weld 52. In addition, the support frame 40 has the outer surfaces of the bent portions 50 on both sides being long in order to prevent the center portion of the brush unit 34 from being bent and displaced when the rotating brush 30 contacts the moving electrode while rotating. It is fillet welded in the form of dots by so-called tap welds 54 at appropriate intervals along the direction. In order to reduce the thermal influence on the brush element wire 42, the tap welded portion 54 may be alternately formed on both sides, that is, staggered.
[0017]
Further, in the brush unit 34, the brush wire 42 at a position corresponding to the continuous welded portion 52 that is easily affected by the welding heat is removed in advance over the length a. The effect of the welding heat of 42 is not exerted. The right-handed brush unit 34a and the left-handed brush unit 34b are configured such that, as shown in FIG. Only b is overlapped so that no gap is generated between the two in the axial direction of the rotary shaft 32, thereby preventing dust scraping and leakage.
[0018]
When the brush unit 34 is welded to the rotary shaft 32, the brush unit 34 may be previously formed in a predetermined spiral shape, and then the spiral brush unit 34 may be disposed on the collecting surface of the rotary shaft 32 for welding. Then, welding may be performed while the linear brush unit 34 is bent in a spiral shape.
[0019]
In the embodiment thus configured, the brush unit 34 has a structure in which a large number of brush wires 42 are implanted in a channel-shaped support frame 40, and is welded and fixed to the rotary shaft 32 via the support frame 40. Therefore, the number of parts and the number of assembling steps can be greatly reduced, and the production of the rotating brush 30 can be facilitated and the cost can be greatly reduced. Moreover, since the welding and fixing of the brush unit 34 is performed by welding the outer portion of the space 46 formed inside the support frame 40, the welding heat applied to the support frame 40 is prevented from being directly transmitted to the brush wire 42. In addition, a part of the welding heat is dissipated into the atmosphere through the space 46, and the influence of the welding heat on the brush wire 42 implanted in the support frame 40 can be reduced. Deterioration due to heat is prevented, and the occurrence of breakage due to use can be prevented. As a result, it is possible to prevent the brush element wire 42 from being broken and mixed into the fly ash, and to eliminate the ash discharge and the breakage of the conveying device due to the mixing of the brush element wire 42 into the ash. There will be no obstacle to the reuse of ash.
[0020]
In the above embodiment, the description has been given of the case where both ends of the brush unit 34 are welded by the continuous welded portion 52 and the gap between them is welded by the tap welded portion 54. However, the tap welded portion 54 is omitted. May be.
[0021]
FIG. 3 is a partial development view of another embodiment. As shown in FIG. 3, both end portions of the brush unit 34 and one to several places in between may be welded by the continuous welding portion 52. In this case, the positions of the intermediate welded portions of the four brush units 34 are shifted from each other, the portions of the brush wires 42 corresponding to the continuous welded portions are previously removed by cutting or the like, and the welding heat of the brush wires 42 is increased. Prevents deterioration due to
[0022]
FIG. 4 schematically shows still another embodiment. In this embodiment, a dovetail groove 56 that matches the shape of the support frame 40 of the brush unit 34 is formed on the peripheral surface of the shaft body 36, and the support frame 40 is fitted in the dovetail groove 56. . Each support frame 40 has a bottom corner portion forming a space 46 at both ends fixed to the shaft body 36 by a weld 48. If comprised in this way, the welding location of the brush unit 34 can be decreased, manufacture becomes easy, and the thermal influence of the brush strand 42 can be made smaller. Note that welding for fixing the brush unit 34 in the dovetail groove 56 may be omitted by reducing the gap between the dovetail groove 56 and the support frame 40.
[0023]
In the embodiment, the case where the four brush units 34 are spirally wound around the rotating shaft 32 has been described. However, the number of the brush units 34 attached to the rotating shaft 32 is arbitrarily selected as necessary. can do. In the above embodiment, the case where the winding direction of the brush unit 34 is changed on both sides of the central portion of the shaft body 36 has been described. However, the entire shaft body 36 may be wound in the same direction, or may be spiral. You may attach not linearly. In the above embodiment, the rotating part brush used in the moving electrode type electrostatic precipitator has been described. However, the rotating part brush can be applied to a rotating brush for other purposes.
[0024]
【The invention's effect】
As described above, according to the present invention, the brush unit has a structure in which a large number of brush wires are implanted in a channel-shaped support frame, and is welded to the surface of the rotating shaft via the support frame. Therefore, the number of parts and the number of assembling steps can be greatly reduced, and the production of the rotating brush can be facilitated and the cost can be greatly reduced. Further, since the void formed in the support frame is welded to the rotating shaft via the outside, the welding heat is difficult to be transmitted to the brush strand, and thermal damage to the brush strand due to the welding heat can be avoided. Therefore, it is possible to prevent the occurrence of hair breakage during use, and it is possible to prevent the broken brush element from being mixed into the fly ash and damaging the ash transport device, thereby preventing the ash reuse. can do.
[0025]
In addition, when the outer surface of the bottom corner portion of the support frame along the longitudinal direction is intermittently welded in the form of dots, when the brush unit is long, the intermediate portion of the brush unit is bent when it comes into contact with the object. Can be prevented from slipping out. In addition, by performing spot welding, it is possible to reduce the influence of welding heat on the brush strands, and to prevent deterioration of the brush strands. In order to firmly fix the brush unit to the rotating shaft, when both ends of the brush unit are continuously welded, if a portion of the brush wire corresponding to the welded portion is removed in advance, a large welding heat is generated. Even if it is added to the brush unit, there is no brush element wire in that portion, so the brush element line is not damaged.
[Brief description of the drawings]
FIG. 1 is a front view of a brush unit and an explanatory diagram of a rotating brush according to an embodiment of the present invention.
FIG. 2 is a schematic diagram showing the entire rotating brush according to the embodiment of the present invention.
FIG. 3 is a partially developed view showing another embodiment.
FIG. 4 is a schematic diagram showing still another embodiment.
FIG. 5 is a cross-sectional view of a conventional brush unit and a diagram for explaining a method for manufacturing a rotating brush.
[Explanation of symbols]
30 Rotating brush 32 Rotating shaft 34 Brush unit 40 Support frame 42 Brush element wire 44 Core wire 46 Space 48 Welding part 52 Continuous welding part 54 Tap welding part

Claims (2)

The rotating brush multiple brush element wire on the peripheral surface of the rotary shaft are disposed, having a brush unit which is welded at a mutual spacing in the circumferential direction of the rotary shaft, the brush unit, a number of stainless steel A space is formed in the bottom corner portion of the channel-shaped support frame in which the brush element wires made of steel are implanted, and the outer surface of the bottom corner portion is intermittently spot- welded to the rotating shaft along the longitudinal direction . A rotating brush for a moving electrode type electrostatic precipitator . After planting many stainless steel brush strands so that a space is formed at the bottom corner of the concave support frame, the support frames with the brush strands spaced from each other in the circumferential direction of the rotating shaft at a place, the rotary brush of the moving electrode type electric dust collector, wherein the outer surface of said bottom corner portion forming the space welding at mutually intervals in the circumferential direction of the rotary shaft Manufacturing method.

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