JP2012101164A - Rotary electrode type electrostatic precipitator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To recover and regenerate performance of a rotary electrode plate and to attain long life of the rotary electrode plate by certainly conveying and removing dust adsorbed on the rotary electrode plate to outside the rotary electrode plate without storing the dust by certainly circulating a conveying belt.SOLUTION: A rotary electrode type electrostatic precipitator includes the rotary electrode plate 12 in a ground connection state, a fixed electrode plate 13 to which predetermined voltage is applied, the conveying belt 14 which comes in contact with or comes close to the rotary electrode plate 12, a driving pulley 15 and a follower pulley 16 around which the conveying belt 14 is wound, and a conveyed dust removing means 17 which comes in contact with the conveying belt 14. At an inner surface of the conveying belt 14, a rugged part is formed in a longitudinal direction and at peripheral surfaces of the driving pulley 15 and the follower pulley 16, rugged parts are formed in a circumference direction. By meshing the rugged part of the conveying belt 14 with the rugged parts of the driving pulley 15 and the follower pulley 16, rotation of the driving pulley 15 is transmitted to the conveying belt 14.

Description

  The present invention relates to an industrial rotary electrode type electrostatic precipitator that sucks in high-viscosity dust such as fume dust and oil mist generated during welding work, and purifies the air in the factory, in particular, adsorbed to the rotary electrode plate. The present invention relates to a rotary electrode type electrostatic precipitator that conveys and removes dust outside an electrode plate.

  Conventionally, an industrial electrostatic precipitator has been used to perform air purification in a factory by sucking highly viscous dust such as fume dust or oil mist. The electric dust collector includes, for example, a load electrode portion that causes positive or negative charge to fine dust, and a ground-connected dust collection electrode portion that adsorbs the charged fine dust, and is adsorbed on the dust collection electrode portion. There is an electrostatic precipitator that accumulates and collects fine dust particles.

  However, in this type of electrostatic precipitator, in order to remove the fine dust adsorbed on the dust collecting electrode part and maintain the dust collecting performance, it is necessary to frequently take out and clean the dust collecting electrode part. It was very complicated.

  Therefore, Patent Document 1 includes a rotating electrode plate capable of adsorbing dust, an annular band provided so as to be in contact with or close to the rotating electrode plate, and a pulley around which the annular band is wound. An electrostatic precipitator is disclosed. In this prior art, while rotating the rotating electrode plate, the sprocket structure pulley and the annular band provided with the round hole with which the sprocket is engaged are driven to convey dust to the outside of the rotating electrode plate. Dust adhering to the surface of the body is scraped off by squeegee-like scraping means. As another means, the flat belt and the cylindrical pulley are driven while the rotating electrode plate is rotated to convey the dust to the outside of the rotating electrode plate, thereby removing dirt such as dust adhering to the surface of the annular belt. Also known is an electric dust collector of the type that is scraped off by a squeegee-like scraping means.

JP 2009-262007 A

  However, as in the above-mentioned Patent Document 1, in the mechanism that transports dust with a sprocket structure pulley and an annular band provided with a round hole with which the sprocket meshes, the pitch distance between the round holes of the sprocket and the annular band is manufactured. Dimensional changes are likely to occur due to errors, assembly errors, and aging. For this reason, the sprocket and the round hole of the annular band are shifted from each other as the driving time elapses. In the worst case, the sprocket of the pulley does not enter the round hole of the annular band. In this case, since the annular band slips and does not rotate, the dust adsorbed on the rotating electrode plate cannot be collected.

  Further, in the method using the flat belt and the cylindrical pulley described above, a mechanism for conveying dust using a frictional force between the flat belt and the pulley is employed. In such a mechanism, the collected oil mist enters between the belt and the pulley to reduce the frictional force, and the flat belt slips and does not rotate, so that the same phenomenon as described above occurs.

  Therefore, in consideration of the above circumstances, the present invention reliably conveys and removes the dust adsorbed on the rotating electrode plate by collecting it around the rotating electrode plate by rotating the conveying belt securely, thereby rotating the conveying belt. The object is to recover and regenerate the performance of the electrode plate and to extend the life of the rotating electrode plate.

  In order to achieve the above object, the present invention provides a plurality of rotating electrode plates arranged in parallel in a ground connection state, and interposed between the rotating electrode plates in a state where a predetermined voltage is applied. A plurality of fixed electrode plates in which a space portion is notched toward the portion, a conveyor belt disposed in contact with or in proximity to the rotating electrode plate in the space portion, and the conveyor belt wound around A driving pulley and a driven pulley; and a conveying dust removing means provided in contact with the conveying belt, the dust charged by the fixed electrode plate being adsorbed to the rotating electrode plate, and then the conveying belt The rotary electrode type electrostatic precipitator is configured to be collected from the rotary electrode plate by the above and removed from the transport belt by the transport dust removing means, and an uneven portion is formed in the longitudinal direction on the inner surface of the transport belt. The drive pulley and the driven pulley are formed with uneven portions in a circumferential direction, and the drive pulley and the driven pulley and the driven pulley are engaged with each other to engage the drive pulley. Is transmitted to the conveyor belt.

  In this way, by forming the concavo-convex portions on the conveyor belt, the driving pulley, and the driven pulley, respectively, the conveyor belt, the driving pulley, and the driven pulley can be surely engaged with each other, and slippage of the conveyor belt can be prevented. Therefore, the dust adsorbed on the rotating electrode plate can be reliably conveyed out of the rotating electrode plate without accumulating.

  Furthermore, the stubborn dust that sticks to the conveyor belt and does not fall naturally can be reliably removed by the conveyor dust removing means. Therefore, the performance of the rotating electrode plate can be recovered and reproduced, and the life of the rotating electrode plate can be extended.

  Further, the uneven portions of the transport belt may be formed at equal intervals by etching.

  According to such a means, it is possible to form uneven portions at regular intervals by etching processing on a conveyance belt that is usually thin, so that the engagement between the conveyance belt and the driving pulley and the driven pulley is further ensured. It becomes possible. Therefore, slip of the conveyor belt is suppressed, and dust can be stably conveyed.

  Further, tension means for applying a constant tension to the conveyor belt may be provided.

  According to such a means, it becomes possible to improve the shape stability of the conveying belt that circulates between the pulleys, and it is possible to stably convey dust.

  The tension means is a tension spring having hooks at both ends, the conveyor belt is endless, and the circumference of the conveyor belt is shorter than the circumference of the drive pulley and the driven pulley. In addition, hook attachment holes are formed at both ends of the conveyance belt, and the hook is hooked on the hook attachment hole in a state where the conveyance belt is wound around the outer periphery of the driving pulley and the driven pulley. The both ends of the conveyor belt may be connected and a certain tension may be applied to the conveyor belt.

  As described above, by using the tension spring as the tension means, it is possible to reliably apply a certain tension to the transport belt. Furthermore, since securing such tension can be realized by a relatively simple method, the cost of the apparatus itself can be reduced.

  Further, the driving pulley and the driven pulley may be provided with a groove portion in a direction perpendicular to the axis thereof, and the groove portion may be provided so as to be in contact with the outer diameter portion of the tension spring.

  According to such means, when the tension spring enters the groove portion of the driving pulley and the driven pulley as the conveyor belt circulates, friction force is generated by the outer diameter portion of the tension spring contacting and pressing the groove portion. To do. Therefore, it is possible to prevent slipping between the conveyor belt, the driving pulley, and the driven pulley.

  In addition, a bent portion may be provided inward at the both end portions of the transport belt, and the groove portion may be provided so as to accommodate the bent portion of the transport belt.

  According to such means, when the tension spring enters the groove portion of the pulley as the conveyor belt goes around, both ends of the conveyor belt and the tension spring enter inside. For this reason, both ends of the transport belt and the tension spring are less likely to come into contact with the transport dust removing means, and there is no risk of damaging both ends of the transport belt and the tension spring.

  The groove may be provided with an uneven shape.

  According to such means, when the tension spring enters the groove portion of the driving pulley or the driven pulley, the outer diameter portion of the tension spring contacts and is pressed against the uneven shape formed in the groove portion, thereby further increasing the frictional force. Is possible. Therefore, it is possible to more reliably prevent slipping between the conveyance belt, the driving pulley, and the driven pulley.

  Further, the uneven shape may be formed by knurled eyes.

  According to such means, it is possible to relatively easily form regular irregularities with regular intervals by knurling.

  Moreover, the said uneven | corrugated | grooved part of the said drive pulley and the said driven pulley may be formed by the knurled eyes.

  According to such means, it is possible to relatively easily form irregular portions with regular intervals by knurling.

  Moreover, the front-end | tip part of the said conveyance dust removal means may be provided so that the said conveyance belt of the part currently wound by the said driven pulley may be contacted.

  According to such means, since the conveyor belt is sandwiched between the tip of the conveyor dust removing means and the driven pulley, it is possible to reliably remove dust on the conveyor belt without escaping the conveyor belt. .

  Moreover, you may provide the spring which presses the said conveyance dust removal means to the said conveyance belt side.

  According to such means, it is possible to reliably apply a constant pressing force to the conveying belt by using the spring as the pressing means of the conveying dust removing means. Furthermore, such a pressing force can be ensured by a relatively simple method, so that the cost of the apparatus itself can be reduced.

  The present invention reliably removes the dust adsorbed on the rotating electrode plate by collecting the dust by adhering to the rotating electrode plate by reliably rotating the conveying belt, thereby recovering and regenerating the performance of the rotating electrode plate, Longer life of the rotating electrode plate can be realized.

It is a perspective view which shows the internal structure of the rotating electrode type electrostatic precipitator which concerns on the 1st Embodiment of this invention. It is a front view which shows the internal structure of the rotating electrode type electrostatic precipitator which concerns on the 1st Embodiment of this invention. It is a perspective view which shows the external appearance of a 1st dust collection part in the rotating electrode type electrostatic precipitator which concerns on the 1st Embodiment of this invention. It is a perspective view which shows the principal part of a 1st dust collection part in the rotating electrode type electrostatic precipitator which concerns on the 1st Embodiment of this invention. It is a side view of the 1st dust collection part in the rotating electrode type electrostatic precipitator concerning a 1st embodiment of the present invention. It is an enlarged view of the principal part of FIG. In the rotating electrode type electrostatic precipitator according to the first embodiment of the present invention, (a) is a plan view showing a developed transport belt, and (b) is a side view thereof. In the rotary electrode type electrostatic precipitator according to the first embodiment of the present invention, (a) is an explanatory view showing a state in which the tension spring has entered the groove portion of the drive pulley, and (b) is a diagram in which the tension spring is a driven pulley. It is explanatory drawing which shows the state which approached the groove part. It is a side view of a 1st dust collection part in the rotating electrode type electrostatic precipitator which concerns on the 2nd Embodiment of this invention. It is an enlarged view of the principal part of FIG. In the rotating electrode type electrostatic precipitator according to the second embodiment of the present invention, (a) is a plan view showing a developed conveyor belt, and (b) is a side view thereof. In the rotary electrode type electrostatic precipitator according to the second embodiment of the present invention, (a) is an explanatory view showing a state in which the tension spring has entered the groove portion of the drive pulley, and (b) is a diagram in which the tension spring is a driven pulley. It is explanatory drawing which shows the state which approached the groove part.

  Embodiments of the above-described rotating electrode type electrostatic precipitator 1 (hereinafter abbreviated as “dust collector 1”) according to the present invention will be described below with reference to the drawings. These embodiments are preferred specific examples of the present invention. However, the technical scope of the present invention is not limited to these embodiments unless specifically described to limit the present invention.

<First Embodiment>
The dust collector 1 which concerns on the 1st Embodiment of this invention is demonstrated using FIGS. This embodiment assumes a general usage state in which the amount of dust to be sucked and the operation time are normal. Hereinafter, the case where the near side in FIG. 1 is the front side of the dust collector 1 will be described.

  As shown in FIG. 1 and FIG. 2, the dust collector 1 includes a main body 2 having a vertically long rectangular parallelepiped shape and a first dust collection unit provided in a unit structure on the intake side (right side in the present embodiment) of the internal space 3 of the main body 2. Part 4 and a second dust collecting part 5 provided in a unit structure on the exhaust side (left side in the present embodiment) of the internal space 3 of the main body 2. 1 and 2, the main body 2 is indicated by a two-dot chain line.

  An intake duct 6 is provided on the right side of the upper surface of the main body 2, and a wire mesh prefilter (not shown) is provided between the intake duct 6 and the internal space 3 of the main body 2. A blower 7 is provided at the left front portion of the upper surface of the main body 2, and an exhaust duct 8 is provided behind the blower 7. Then, by operating the blower 7, the air outside the dust collector 1 is introduced into the internal space 3 from the intake duct 6 and discharged from the exhaust duct 8 to the outside of the dust collector 1. An oil pan 10 is provided at the lower end of the main body 2.

  As shown in FIGS. 3 to 5, the first dust collecting portion 4 includes an outer frame 11 having a U-shape when viewed from the front, and eight rotary electrodes arranged in parallel at equal intervals in the outer frame 11. A plate 12, seven fixed electrode plates 13 interposed between the eight rotary electrode plates 12, a conveyance belt 14 disposed from the center of the fixed electrode plate 13 to below the lower end, and a conveyance A driving pulley 15 and a driven pulley 16 in which an upper end portion and a lower end portion of the belt 14 are wound, respectively, and a scraper 17 as a conveying dust removing unit provided in contact with the conveying belt 14 in front of the lower end of the conveying belt 14. It is equipped with. In FIG. 4, the left and right side plates 18 and 20 constituting both side portions of the outer frame 11 are not shown, and the leftmost rotating electrode plate 12 is indicated by a two-dot chain line.

  An upper end opening 21 is provided on the upper surface of the outer frame 11. At the lower end portion of the left side plate 18 of the outer frame 11, a tongue-like support plate 22 protrudes downward from the center portion in the front-rear direction. It is in contact with the bottom surface of the internal space 3. Lower end openings 25 are provided on both sides of the support plate 22 in the front-rear direction (see FIG. 1). The lower end opening 25 communicates with the upper end opening 21 via a space in the outer frame 11. The front surface and the rear surface of the outer frame 11 are in contact with the front surface and the rear surface of the internal space 3 of the main body 2, respectively.

  The rotating electrode plate 12 has a disk shape and is accommodated in a space in the outer frame 11. The rotating electrode plate 12 is integrally fixed at a fixed interval to a rotating shaft 26 that is horizontally supported between the central portion of the left side plate 18 and the central portion of the right side plate 20. A brush (not shown) is in contact with the rotating shaft 26, and the rotating shaft 26 and the rotating electrode plate 12 are grounded via the brush. The right end of the rotating shaft 26 is connected to a geared motor 27 provided coaxially with the rotating shaft 26 on the right side of the right side plate 20 (see FIG. 1). A reduction mechanism (not shown) is housed inside the geared motor 27, and the rotational driving force from the geared motor 27 is decelerated by the reduction mechanism and transmitted to the rotation shaft 26, and the rotation shaft 26 and the rotation electrode plate. 12 is configured to rotate integrally. In addition, the rotational speed of the rotating shaft 26 and the rotating electrode plate 12 is extremely slow, about once per minute.

  On the front upper side, the front lower side, the rear upper side and the rear lower side of the rotating electrode plate 12, support rods 30 whose left and right ends are fixed to the left and right side plates 18 and 20 are provided in the left and right direction. A guide groove 31 is provided on the peripheral surface of the support rod 30 at a position corresponding to the rotary electrode plate 12, and an outer edge portion of the rotary electrode plate 12 enters the guide groove 31, thereby supporting the rotary electrode plate 12. Guided by the heel 30.

  The fixed electrode plate 13 has a flat plate shape. The fixed electrode plate 13 is arranged in the center of the space between the rotating electrode plates 12 in the space inside the outer frame 11. The fixed electrode plate 13 is connected to voltage supply means (not shown), and is configured such that a positive high voltage is applied to the fixed electrode plate 13 by operating the voltage supply means.

  The fixed electrode plate 13 is supported by the left and right side plates 18 and 20 of the outer frame 11. The support structure of the fixed electrode plate 13 by the left and right side plates 18 and 20 will be described. The four front and rear and upper and lower corners of the fixed electrode plate 13 are fixed to the conductive spacers 32 provided in the left and right directions at regular intervals. Yes. The left and right end portions of the conductive spacer 32 extend outward from the left and right side plates 18 and 20 through escape holes 33 formed in the front and rear upper and lower corners of the left and right side plates 18 and 20. , 20 are fixed with bolts 36 at four corners of an insulator mounting plate 35 provided in parallel with the outer surface. The lever mounting plate 35 is fixed to the outer side surfaces of the left and right side plates 18 and 20 via a columnar lever 34. With the above configuration, the fixed electrode plate 13 is supported by the left and right side plates 18 and 20. In addition, although the insulator attachment plate 35 and the insulator 34 are similarly provided on the outer surface of the right side plate 20, only the insulator attachment plate 35 and the insulator 34 of the left side plate 18 are displayed in FIG. Further, the insulator 34 is provided at the front upper part and the rear lower part of the outer side surfaces of the left and right side plates 18 and 20, respectively, but in FIG. 3, only a part of the insulator 34 at the rear lower part of the left side plate 18 is displayed. Yes.

  Since the insulator 34 has electrical insulation, the insulator mounting plate 35 fixed via the insulator 34 and the left and right side plates 18 and 20 are electrically insulated. Thus, the fixed electrode plate 13 attached to the insulator attachment plate 35 via the conductive spacer 32 and the rotary electrode plate 12 attached to the left and right side plates 18 and 20 via the rotary shaft 26 are electrically insulated. Has been.

  An opening 37 that is long in the front-rear direction is provided at the upper end of the fixed electrode plate 13, whereby the upper edge portion 38 of the fixed electrode plate 13 has a horizontally long strip shape. A large number of needle-shaped charging electrodes 40 are attached at equal intervals in the front-rear direction by means of welding, caulking, or the like below the opening 37 and the upper edge 38 of the fixed electrode plate 13. An upper end portion of the charging electrode 40 attached below the opening 37 is released into the opening portion 37, and a lower end portion of the charging electrode 40 attached to the upper edge portion 38 is placed in the opening portion 37. The upper end portion is released into the space above the upper edge portion 38 while being released. As a result, when a positive high voltage is applied to the fixed electrode plate 13 from the voltage supply means described above, particularly the tip portion of the charging electrode 40 can discharge as efficiently as possible.

  In the fixed electrode plate 13, a long hole-like space 41 is cut out from the outer periphery (the lower end in the present embodiment) toward the center. Here, the “center portion” of the fixed electrode plate 13 refers to a portion coaxial with the rotation shaft 26 when the rotation shaft 26 is provided as in the present embodiment. It does not have to be the central part in the vertical direction or the central part in the front-rear direction. The space 41 is provided in an inverted U shape in a side view so as to escape around the rotating shaft 26 and the conveyor belt 14.

  Seven conveyor belts 14 are used in the same number as the fixed electrode plates 13. The conveyor belt 14 is made of metal, and is more preferably made of stainless steel having durability and rust prevention. In this embodiment, a stainless steel (SUS304-CSP) conveyance belt 14 having a spring property and a thickness of 0.08 mm is used.

  The conveyor belt 14 is provided in the space 41 of each fixed electrode plate 13 with a predetermined distance from the fixed electrode plate 13, and is interposed between the rotating electrode plates 12 like the fixed electrode plate 13. Yes. The formation width of the conveyor belt 14 is substantially equal to the installation interval of each rotary electrode plate 12, and the left and right side edges of each conveyor belt 14 are the right side surface of the left adjacent rotary electrode plate 12 and the right adjacent rotary electrode plate 12. Each is in contact with the left side. The conveyor belt 14 is provided so that the fixed electrode plate 13 is positioned at the center in the width direction.

  The conveyor belt 14 has an end shape, and both ends 39 thereof are connected by a single tension spring 42 as a tension means (see FIG. 6). As the material of the tension spring 42, for example, SUS304-WPB having excellent corrosion resistance is used.

  The connection of the conveyor belt 14 by the tension spring 42 will be described. Hooks 43 are provided at both ends of the tension spring 42, and hook attachment holes 44 are provided at both ends 39 of the conveyor belt 14 (see FIG. 7). . Then, both ends 39 of the conveyor belt 14 are connected by hooking the hook 43 of the tension spring 42 to the hook mounting hole 44 in a state where the conveyor belt 14 is wound around the outer periphery of the drive pulley 15 and the driven pulley 16. It has become. The tension spring 42 is attached to the transport belt 14 in such a direction that the tip of the hook 43 is not caught when it comes into contact with the scraper 17.

  The conveyor belt 14 is formed so that its circumference is shorter than the circumference between the driving pulley 15 and the driven pulley 16. Accordingly, when the both end portions 39 of the transport belt 14 are connected, the tension spring 42 extends and a certain tension is applied to the transport belt 14. In this embodiment, the conveyance belt 14 is connected in a state where the tension spring 42 is extended by several millimeters, and a tension of about 5N is applied to the conveyance belt 14 as an appropriate tension.

  As apparent from the above description, the tension of the tension spring 42 is always applied around the hook mounting hole 44 in the mounted state of the conveyor belt 14. Therefore, a metal fitting 45 for reinforcing the hook attachment hole 44 is attached to the hook attachment hole 44 (see FIG. 7).

  As best shown in FIG. 7, both end portions 39 of the conveyor belt 14 have a tapered shape that gradually becomes thinner toward the tip. On the inner surface 46 of the conveyor belt 14, uneven portions 47 are provided at equal intervals in the longitudinal direction by etching. In the present embodiment, the depth of the uneven portion 47 is about 0.03 mm. At the center in the width direction of the inner surface 46 of the transport belt 14, a flat portion 48 that is not subjected to uneven processing is provided continuously in the longitudinal direction. In the upper diagram (plan view) of FIG. 7, the concave portion 49 of the concave and convex portion 47 formed by etching is hatched.

  As shown in FIGS. 3 to 5, the drive pulley 15 is fitted to the rotation shaft 26 and is configured to rotate integrally with the rotation shaft 26. The driven pulley 16 is fitted to a belt shaft 50 provided directly below the rotation shaft 26 and is configured to rotate integrally with the belt shaft 50. The belt shaft 50 is provided between the lower end portions of the support plate 22 and the right side plate 20, and is provided below the lower end portions of the rotating electrode plate 12 and the fixed electrode plate 13. Accordingly, the driven pulley 16 fitted to the belt shaft 50 and the lower end portion of the transport belt 14 wound around the driven pulley 16 are also positioned below the lower end portions of the rotating electrode plate 12 and the fixed electrode plate 13. ing.

  As shown in FIG. 8B, an annular flange member 59 formed separately from the driven pulley 16 is provided on the outer periphery of both ends of the driven pulley 16 in the axial direction. Thus, the conveyor belt 14 is wound around the driven pulley 16. 5 and 6, the flange member 59 is indicated by a two-dot chain line. Except for the presence / absence of the flange member 59 and the shape of both end portions in the axial direction, the drive pulley 15 and the driven pulley 16 have the same configuration, and therefore, with reference to FIGS. 8 (a) and 8 (b), FIG. The configuration of both pulleys 15 and 16 will be described simultaneously.

  The drive pulley 15 and the driven pulley 16 (hereinafter abbreviated as “both pulleys 15 and 16”) are made of aluminum. The circumferential surfaces 51 of both pulleys 15 and 16 are formed with uneven portions 52 that are equally spaced in the circumferential direction, and are driven when the uneven portions 47 of the conveyor belt 14 and the uneven portions 52 of both pulleys 15 and 16 mesh with each other. The rotation of the pulley 15 is transmitted to the conveyor belt 14 so that the conveyor belt 14 rotates in a predetermined direction. In this embodiment, the concavo-convex portions 52 of the pulleys 15 and 16 are formed by knurling, and the module is 0.3. The concave / convex portion 52 is provided annularly and continuously on the peripheral surface 51 of both the pulleys 15 and 16, but in FIGS. 8 (a) and 8 (b), the lower portions of both pulleys 15 and 16 are excluded. The description of the concavo-convex portion 52 is omitted.

  On the peripheral surfaces 51 of the pulleys 15 and 16, a V-shaped groove 53 is recessed in the direction perpendicular to the axes of the pulleys 15 and 16 with a uniform left and right dimension from the center in the width direction of the pulleys 15 and 16. ing. The groove 53 is deep so that the outer diameter portion 54 of the tension spring 42 can come into contact with the inclined surface of the groove 53 when the tension spring 42 enters the pulleys 15 and 16 as the conveyor belt 14 rotates. The height and angle are adjusted.

  The scraper 17 is made of aluminum. As shown in FIGS. 3 and 4, the scraper 17 is provided in a single flat plate shape from the front of the left end conveyance belt 14 to the front of the right end conveyance belt 14. The scraper 17 is rotatably attached to the scraper shaft 55. The position where the scraper 17 is attached to the scraper shaft 55 is set such that the tip 56 of the scraper 17 that contacts the conveyor belt 14 is as close to the driven pulley 16 as possible.

  The scraper shaft 55 is provided in parallel with the belt shaft 50, and is laid between the support plate 22 and the lower end portion of the right side plate 20 in front of the belt shaft 50. A torsion coil spring 57 as a spring is attached to the right end portion of the scraper shaft 55. One end of the torsion coil spring 57 is bent toward the right side plate 20 and is inserted into a spring fixing hole 58 provided in the right side plate 20. The other end of the torsion coil spring 57 is pressed against the scraper 17. With such a configuration, the scraper 17 is pressed toward the conveyor belt 14 by the moment action of the torsion coil spring 57, and the tip 56 of the scraper 17 is pressed against the conveyor belt 14. Note that if the tip 56 of the scraper 17 is pressed against the conveyor belt 14 more than necessary, the conveyance power is burdened. Therefore, in this embodiment, an appropriate pressing force is set to about 0.2 to 0.4 N. Has been.

  As shown in FIGS. 1 and 2, the second dust collection unit 5 has a structure basically similar to that of the first dust collection unit 4 described above. Hereinafter, although the 2nd dust collection part 5 is demonstrated, description is abbreviate | omitted about the part with the same structure as the 1st dust collection part 4. FIG.

  The second dust collecting unit 5 includes an outer frame 61 having a U-shape when viewed from the front, twelve rotating electrode plates 62 arranged in parallel in the outer frame 61 at equal intervals, and the twelve rotating electrode plates. 11 fixed electrode plates 63 interposed between 62, 11 conveyor belts 64 disposed from the center of the fixed electrode plate 63 to below the lower end, and the upper and lower ends of the conveyor belt 64 A drive pulley and a driven pulley (both not shown) wound respectively, and a scraper 65 as conveying dust removing means provided so as to be in contact with the conveying belt 64 in front of the lower end of the conveying belt 64. ing.

  An upper end opening 66 is provided on the upper surface of the outer frame 61 of the second dust collecting unit 5. (See FIGS. 1 and 2). At the lower end portion of the right side plate 67 of the outer frame 61, a tongue-like support plate 68 projects downward at the center in the front-rear direction, and the lower end portion of the support plate 68 is the inner space 3 of the main body 2. It is in contact with the bottom surface. Lower end openings 71 are provided on both sides of the support plate 68 in the front-rear direction.

  The rotation electrode plate 62 has a smaller installation interval than the rotation electrode plate 12 of the first dust collection unit 4, and the number of installations is larger than that of the first dust collection unit 4. A rotating shaft 72 of the second dust collecting unit 5 in which the rotating electrode plate 62 is integrally formed is provided coaxially with the rotating shaft 26 of the first dust collecting unit 4, and is coupled by a coupling 73 at the center of the main body 2. The rotating shaft 26 of the first dust collecting unit 4 is integrated (see FIG. 2). Thereby, the rotational driving force from the geared motor 27 is also transmitted to the rotating shaft 72 of the second dust collecting unit 5, and the rotating shaft 72 and the rotating electrode plate 62 have the same speed as the rotating shaft 26 and the rotating electrode plate 12. It is configured to rotate at. Similar to the rotating electrode plate 62, the fixed electrode plate 63 and the conveyor belt 64 have a smaller installation interval and a larger number of installations than the first dust collecting unit 4.

  The operation of cleaning air containing dust such as oil mist and welding fume (hereinafter referred to as “dust-containing air”) using the dust collector 1 configured as described above will be described below.

  First, when the geared motor 27 is driven, the rotation of the geared motor 27 is transmitted to the rotating shaft 26 of the first dust collecting unit 4 through the reduction mechanism, and the rotating shaft 26 and the rotating electrode plate 12 of the first dust collecting unit 4 are transmitted. Rotates integrally in a predetermined direction (see arrow A in FIG. 5). Further, along with the rotation of the rotating shaft 26, the driving pulley 15 that is integrally fitted to the rotating shaft 26 also rotates. The rotation of the driving pulley 15 is transmitted to the conveying belt 14, and the conveying belt 14 is rotated. It rotates in a predetermined direction (see arrow B in FIG. 5).

  At the same time, the rotation from the geared motor 27 is also transmitted to the rotating shaft 72 of the second dust collecting unit 5 integrated with the rotating shaft 26 of the first dust collecting unit 4 by the coupling 73, and the second dust collecting unit 5. The rotating shaft 72 and the rotating electrode plate 62 rotate together. Accordingly, the conveyance belt 64 of the second dust collection unit 5 rotates in the same manner as the conveyance belt 14 of the first dust collection unit 4.

  Further, when the high voltage supply means is operated, a positive high voltage is applied to the fixed electrode plates 13 and 63 provided in the first dust collecting unit 4 and the second dust collecting unit 5, respectively, so that the fixed electrode plate 13 is fixed. The charged charging electrode 40 starts discharging.

  When the blower 7 of the main body 2 is operated in this state, the dust-containing air outside the main body 2 flows into the internal space 3 of the main body 2 from above through the intake duct 6 from above. It should be noted that extremely large dusts and fire types contained in the dust-containing air are collected by the prefilter (not shown) provided as described above between the intake duct 6 and the internal space 3 of the main body 2, and It is not sucked inside.

  As described above, the dust-containing air that has flowed into the internal space 3 of the main body 2 flows into the space in the outer frame 11 of the first dust collecting portion 4 from the upper end opening 21 (see the arrows in FIGS. 1 and 5). It passes through the inside of the first dust collecting section 4 from top to bottom. As shown in FIG. 5, a large amount of dust 80 that cannot be removed by the prefilter is mixed in the dust-containing air passing through the first dust collecting unit 4. Therefore, first, the dust 80 in the dust-containing air is charged to the plus side by the discharge from the charging electrode 40, particularly the high voltage corona discharge from the tip of the charging electrode 40. The dust 80 charged to the positive side in this way is adsorbed to the rotating electrode plate 12 connected to the ground.

  Since the dust 80 such as oil mist and welding fume that is the most effective recovery target assumed in the present invention is very sticky, the dust 80 adsorbed on the rotating electrode plate 12 gradually becomes on the surface of the rotating electrode plate 12. It will be deposited. When the dust 80 is accumulated to some extent, positively charged particles are interposed between the rotary electrode plate 12 and the positively charged dust 80, and the dust 80 is gradually less likely to be adsorbed by the rotary electrode plate 12. come.

  Therefore, the dust 80 accumulated on the rotating electrode plate 12 is collected by the conveyor belt 14. In other words, the dust 80 accumulated on the surface of the rotating electrode plate 12 is scraped off from the surface of the rotating electrode plate 12 by the conveyor belt 14 arranged so that both side surfaces of the rotating electrode plate 12 are in contact with the left and right side edges. Are collected, resulting in enlargement. A part of the enlarged dust 80 naturally falls during the conveyance process and is collected in the oil pan 10 (see FIGS. 1 and 2). In addition, the dust 80 that does not naturally fall is transported along the transport direction of the transport belt 14 toward the outside of the rotating electrode plate 12 (in the present embodiment, below the lower end portion of the rotating electrode plate 12). Then, the scraper 17 that contacts the conveyor belt 14 is scraped and removed from the surface of the conveyor belt 14, falls into the oil pan 10, and is collected. In addition, although the conveyance belt 14 is attached between the rotating electrode plates 12, respectively, and dust adheres to each conveyance belt 14, in this embodiment, seven flat scrapers 17 are used. The dust 80 adhering to all the conveyor belts 14 can be scraped off.

  As shown in FIG. 1, the dust-containing air from which the dust 80 has been collected proceeds to the left above the oil pan 10 and is discharged from the first dust collecting unit 4 through the lower end opening 25. Then, it flows into the second dust collecting part 5 through the lower end opening 71 and passes through the second dust collecting part 5 from the bottom to the top. At that time, the dust-containing air is further cleaned by removing the dust 80 by the same action as that of the first dust collecting unit 4. And the clean air after dust collection is discharged | emitted from the exhaust duct 8 through the blower 7 upper left of the main body 2. FIG.

  In the present embodiment, as described above, since the concavo-convex portions 47 and 52 are formed at equal intervals on the conveyor belt 14 and the pulleys 15 and 16, respectively, the conveyor belt 14 and the pulleys 15 and 16 are reliably engaged and conveyed. It becomes possible to prevent the belt 14 from slipping. Therefore, the dust 80 adsorbed on the rotary electrode plate 12 can be reliably conveyed outside the rotary electrode plate 12 without accumulating.

  Furthermore, the stubborn dust 80 that is stuck to the conveyor belt 14 and does not fall naturally can be reliably removed by the scraper 17. Therefore, the performance of the rotating electrode plate 12 can be recovered and reproduced, and the life of the rotating electrode plate 12 can be extended.

  Further, since the uneven portion 47 of the transport belt 14 is formed by etching, the uneven portion 47 can be formed at equal intervals even when the transport belt 14 having a thin plate thickness is used as in this embodiment. Become. Therefore, the meshing between the conveyor belt 14 and the pulleys 15 and 16 can be further ensured, the slip of the conveyor belt 14 is suppressed, and the dust 80 can be stably conveyed. In particular, in this embodiment, in addition to forming the concavo-convex portion 47 of the transport belt 14 by etching as described above, the concavo-convex portions 52 of both pulleys 15 and 16 are formed by knurling, so the transport belt As a result, the slip suppression effect of the conveyor belt 14 can be enhanced.

  In addition, since both end portions 39 of the conveyor belt 14 are tapered, it is possible to suppress the end portions 39 from colliding with these members when entering the pulleys 15 and 16 and the rotating electrode plate 12, and smoothly. The conveyor belt 14 can be rotated. Further, since the flat portion 48 that is not subjected to the uneven processing as described above is provided at the center in the width direction of the transport belt 14, the strength of the transport belt 14 can be maintained moderately.

  In addition, since the tension spring 42 for applying a constant tension to the conveyor belt 14 is provided, it is possible to improve the shape stability of the conveyor belt 14 when it circulates between the pulleys 15 and 16, and to stabilize the dust 80. Transport is possible. Further, by using the tension spring 42 as the tension means in this way, a certain tension can be reliably applied to the transport belt 14. Furthermore, since securing such tension can be realized by a relatively simple method, the cost of the apparatus itself can be reduced.

  In addition, since the conveyor belt 14 is guided by the flange members 59 provided on both ends of the driven pulley 16 in the axial direction, the conveyor belt 14 passes through the rotating electrode plate 12 and is moved to the driven pulley 16. When heading, it is possible to prevent the conveyor belt 14 from swinging left and right and to perform smooth conveyance.

  The tension spring 42 circulates between the pulleys 15 and 16 as the conveyor belt 14 circulates. However, the tension spring 42 does not have the etched uneven portion 47 provided on the conveyor belt 14. Therefore, when the tension spring 42 enters the pulleys 15 and 16, there is a risk of causing a slip between the conveyor belt 14 and the pulleys 15 and 16. However, in the present embodiment, the V-shaped groove portion 53 that can come into contact with the outer diameter portion 54 of the tension spring 42 is formed on both pulleys 15 and 16. Therefore, when the tension spring 42 enters the grooves 53 of the pulleys 15 and 16, the outer diameter portion 54 of the tension spring 42 comes into contact with and is pressed against the inclined surface of the grooves 53, thereby generating a frictional force. It is possible to prevent slip between the conveyor belt 14 and the pulleys 15 and 16. Further, as means for improving the frictional force, it is also effective to form irregularities in the V-shaped groove 53 by knurling or the like (detailed in the second embodiment).

  In addition, since the torsion coil spring 57 that presses the scraper 17 toward the conveying belt 14 is provided, a certain pressing force can be reliably applied to the conveying belt 14. Furthermore, such a pressing force can be ensured by a relatively simple method, so that the cost of the apparatus itself can be reduced.

  Further, the attachment position of the scraper 17 to the scraper shaft 55 is set such that the tip 56 of the scraper 17 that contacts the conveyor belt 14 is as close to the driven pulley 16 as possible. Therefore, the escape of the conveyor belt 14 can be minimized by the pressing force of the scraper 17, and dirt attached to the conveyor belt 14 can be removed.

  In the present embodiment, the case where the transport belt 14 is brought into contact with the rotating electrode plate 12 has been described. However, in another different embodiment, the transport belt 14 may be disposed so as to be close to the rotating electrode plate 12. In the present embodiment, the case where a positive high voltage is applied to the fixed electrode plate 13 by the voltage supply means has been described. However, in another different embodiment, a negative high voltage may be applied to the fixed electrode plate 13. good.

<Second Embodiment>
The dust collector 1 which concerns on the 2nd Embodiment of this invention is demonstrated below using FIGS. 9-12. This embodiment assumes a usage state when the amount of dust to be sucked is particularly large or when the operation time is long. Hereinafter, the case where the right side in FIG. 9 is the front side of the dust collector 1 will be described. In the dust collector 1 of the second embodiment, the configuration other than the conveyor belt 14, the pulleys 15 and 16, the scraper 17 and its peripheral members is the same as that of the first embodiment described above, and thus the description thereof is omitted. To do.

  Seven conveyor belts 14 are used. The conveyor belt 14 is made of metal, and is more preferably made of stainless steel having durability and rust prevention. In the second embodiment, a stainless steel (SUS301-CSP) transport belt 14 having a thickness of 0.08 mm, which is further improved in durability and strength as compared with the first embodiment, is used. Since the arrangement of the conveyor belt 14 in the first dust collecting unit 4 is the same as that of the first embodiment, the description thereof is omitted.

  The conveyor belt 14 has an end shape, and both end portions 39 are connected by two tension springs 42 as tension means. As the material of the tension spring 42, for example, SUS304-WPB having excellent corrosion resistance is used.

  The connection of the conveyor belts 14 by the tension springs 42 will be described. The hooks 43 are provided at both ends 39 of each tension spring 42, and the hook attachment holes 44 are provided at both ends in the width direction of the conveyor belts 14. The hooks 45 are attached to the hook attachment holes 44 (see FIG. 11). Then, in a state where the conveyor belt 14 is wound around the outer periphery of the drive pulley 15 and the driven pulley 16, the hooks 43 of the tension springs 42 are hooked in the hook mounting holes 44, thereby connecting both end portions 39 of the conveyor belt 14. It has become so. The tension spring 42 is attached to the transport belt 14 in such a direction that the tip of the hook 43 is not caught when it comes into contact with the scraper 17.

  The conveyor belt 14 is formed so that its circumference is shorter than the circumference between the driving pulley 15 and the driven pulley 16. Accordingly, when the both end portions 39 of the transport belt 14 are connected, the tension spring 42 extends and a certain tension is applied to the transport belt 14. In the present embodiment, the conveyor belt 14 is connected in a state where the tension spring 42 is extended by several millimeters, and a tension of about 10 N is applied to the conveyor belt 14 as an appropriate tension.

  As best shown in FIG. 11, both end portions 39 of the conveyor belt 14 have a tapered shape that gradually decreases toward the tip. On the inner surface 46 of the conveyor belt 14, uneven portions 47 are provided at equal intervals in the longitudinal direction by etching. In the present embodiment, the depth of the uneven portion 47 is about 0.04 mm. In the first embodiment, the flat portion 48 is provided at the center in the width direction of the inner surface 46 of the conveyor belt 14. However, in this embodiment, the flat portion 48 is not provided, and the uneven portion 47 is the outer edge portion. Is provided on the entire inner surface 46 except for. In the upper view (plan view) of FIG. 11, the concave portion 49 of the concave and convex portion 47 formed by etching is hatched.

  Thin portions 74 are formed by etching on both end portions 39 of the conveyor belt 14 from the tip to a portion of about several millimeters. This allows the end portions 39 to bend and mesh with both pulleys 15 and 16. Strength is improved. The thin portion 74 is provided with a bent portion 75 toward the inside. In the present embodiment, in order to provide the bent portions 75 at the both end portions 39, the drawn portions 76 are provided at the both end portions 39 by drawing, and then the drawn portions 76 are bent to inward.

  Both pulleys 15 and 16 are made of aluminum. Since the arrangement of the pulleys 15 and 16 in the first dust collecting unit 4 is the same as that of the first embodiment, the description thereof is omitted.

  As shown in FIG. 12B, a shake preventing member 60 formed separately from the driven pulley 16 is provided on the outer periphery of both ends in the axial direction of the driven pulley 16 so as not to rotate. The conveyor belt 14 is wound around the driven pulley 16 as guided by 9 and 10, the shake preventing member 60 is indicated by a two-dot chain line. In the present embodiment, as will be described later, the tip 56 of the scraper 17 is provided so as to come into contact with the portion of the conveyor belt 17 wound around the driven pulley 16. A notch portion 69 (see FIG. 10) is provided so as not to interfere with the front end portion 56. Except for the presence / absence of the shake prevention member 60 and the shape of both end portions in the axial direction, the configurations of the drive pulley 15 and the driven pulley 16 are the same, and hence, with reference to FIGS. 12 (a) and 12 (b), The configuration of the driving pulley 15 and the driven pulley 16 will be described simultaneously.

  On the peripheral surfaces 51 of the pulleys 15 and 16, uneven portions 52 that are equally spaced in the circumferential direction are formed. About the structure of the uneven | corrugated | grooved part 52, since it is the same as that of 1st Embodiment, description is abbreviate | omitted.

  On the peripheral surfaces 51 of the pulleys 15 and 16, an inverted trapezoidal groove 53 is recessed in the direction perpendicular to the axes of the pulleys 15 and 16 so as to have an equal left and right dimension from the center in the width direction of the pulleys 15 and 16. ing. The groove 53 is provided so as to accommodate the bent portion 75 of the conveyor belt 14 and the tension spring 42. That is, when the bent portion 75 and the tension spring 42 enter the pulleys 15 and 16, the bent portion 75 and the tension spring 42 have a size that does not protrude from the groove portion 53. In addition, the groove portion 53 is provided so as not to come into contact with the bent portion 75 when the bent portion 75 enters the pulleys 15 and 16. Further, the depth and angle of the groove portion 53 are adjusted so that the outer diameter portion 54 of the tension spring 42 can come into contact with the groove portion 53 when the tension spring 42 enters the pulleys 15 and 16. The bottom surface and the inclined surface of the groove portion 53 are provided with uneven shapes with knurled eyes.

  The scraper 17 is made of aluminum. The scraper 17 is provided in a single flat plate shape from the front of the left end conveyance belt 14 to the front of the right end conveyance belt 14. The scraper 17 is rotatably attached to the scraper shaft 55. The attachment position of the scraper 17 to the scraper shaft 55 is set so that the tip end portion 56 of the scraper 17 is in contact with the portion of the conveyor belt 17 wound around the driven pulley 16 and the tip end portion 56 of the scraper 17. Is set to be offset from the lower center position of the driven pulley 16. The tip 56 of the scraper 17 has a sharp shape by grinder processing.

  The scraper shaft 55 is provided in parallel with the belt shaft 50, and is laid between the lower portion of the support plate 22 and the lower end portion of the right side plate 20 in front of the belt shaft 50. A torsion coil spring 57 is attached to the scraper shaft 55. One end of the torsion coil spring 57 is pressed against a spring fixing portion 77 protruding from the inner surface 46 of the right side plate, and the other end of the torsion coil spring 57 is pressed against the scraper 17. With such a configuration, the scraper 17 is pressed toward the conveyor belt 14 by the moment action of the torsion coil spring 57, and the tip 56 of the scraper 17 is pressed against the conveyor belt 14. When the scraper 17 is pressed against the conveyor belt 14 more than necessary, a load is imposed on the conveying power. In this embodiment, the appropriate pressing force is set to about 0.1 to 0.2N.

  In the second embodiment, as described above, the bent portions 75 are formed inwardly at both end portions 39 of the tapered conveyor belt 14, and the inverted trapezoidal groove portion 53 that can accommodate the bent portions 75 is provided as both pulleys. 15 and 16. Thus, when the tension spring 42 enters the groove portions 53 of the pulleys 15 and 16 as the conveyor belt 14 circulates, both end portions 39 of the conveyor belt 14 and the tension spring 42 are accommodated in the groove portion 53, and both pulleys 15, 16, in particular, no contact with the tip 56 of the scraper 17 located below the driven pulley 16. Therefore, there is no risk of damaging both end portions 39 and the tension spring 42 of the conveyor belt 14, and the conveyor performance of the conveyor belt 14 and the dust removal performance of the scraper 17 are not affected. Moreover, since the groove part 53 is provided in the position where the bending part 75 does not contact, damage to both the end parts 39 and the tension spring 42 can be prevented more effectively.

  Further, since the groove portion 53 is provided with an uneven shape, when the tension spring 42 enters the groove portion 53 of both pulleys 15 and 16, the groove portion 53 has a fine knurled uneven shape formed in a knurled pattern. When the outer diameter portion 54 of the tension spring 42 comes into contact with and is pressed, the frictional force can be further increased. Therefore, the slip between the conveyance belt 14 and the pulleys 15 and 16 can be more reliably prevented. Moreover, since the uneven shape of the groove part 53 is formed with knurled eyes, it is possible to relatively easily form an uneven shape with regular equal intervals.

  Further, the tip 56 of the scraper 17 is provided so as to contact the portion of the conveyor belt 14 wound around the driven pulley 16, and the conveyor belt 14 is interposed between the tip 56 of the scraper 17 and the driven pulley 16. Therefore, the dust on the conveyor belt 14 can be reliably removed without the conveyor belt 14 escaping. In particular, in this embodiment, since the tip of the scraper 17 is attached so as to come into contact with the conveyor belt 14 at a position offset from the lower central position of the driven pulley 16, the tip 56 of the scraper 17 and the conveyor belt 14 are mutually connected. The dirt adhering to the conveyor belt 14 can be more reliably removed without escaping.

  In addition, two hook attachment holes 44 for hooking the hooks 43 of the tension springs 42 are provided, and two tension springs 42 are attached to the hook attachment holes 44, so that it is about twice that of the first embodiment. Is applied to the conveyor belt 14 to further increase the adhesion between the conveyor belt 14 and the pulleys 15 and 16.

  Further, in order to bend both end portions 39, both end portions 39 are provided with a drawn portion 76 that has been subjected to drawing processing, and then bending is performed to incline the drawn portion 76 inward. For this reason, it is possible to improve the strength of the front end portion 56 of the transport belt 14 and to prevent the scraper 17 from being caught.

  Furthermore, since the tip 56 of the scraper 17 that contacts the conveyor belt 14 has a shape with a sharp tip by grinder processing, dirt and sticky stubborn dust adhering to the conveyor belt 14 can be peeled off and removed. Can do.

  Further, since the conveyor belt 14 is configured to be guided by the vibration preventing members 60 provided at both axial ends of the driven pulley 16, the conveyor belt 14 passes through the rotating electrode plate 12 and is driven pulley 16. When moving toward the center, it is possible to prevent left and right deflection of the conveyor belt 14 and to perform smooth conveyance.

  In this embodiment, the notch portion 69 is provided in the shake preventing member 60. However, in another different embodiment, the shake preventing member 60 is provided by providing a notch portion (not shown) at the distal end portion 56 of the scraper 17. And the tip 56 of the scraper 17 may be prevented from interfering with each other. Further, in this way, when a notch (not shown) is provided at the tip 56 of the scraper 17, the notch 69 may not be provided in the shake preventing member 60.

12 Rotating electrode plate 13 Fixed electrode plate 14 Conveying belt 15 Drive pulley 16 Driven pulley 17 Scraper (conveying dust removing means)
39 Both ends 41 Space 42 Tension spring (tensioning means)
43 hook 44 hook mounting hole 46 inner surface 47 uneven portion 51 peripheral surface 52 uneven portion 53 groove portion 54 outer diameter portion 57 torsion coil spring (spring)
75 bent part

Claims (11)

A plurality of rotating electrode plates arranged in parallel with each other in a ground connection state are interposed between the rotating electrode plates in a state where a predetermined voltage is applied, and a space portion is cut out from the outer peripheral portion toward the center portion. A plurality of fixed electrode plates, a conveyor belt arranged in contact with or close to the rotating electrode plate in the space, a driving pulley and a driven pulley around which the conveyor belt is wound, and a contact with the conveyor belt A conveying dust removing means provided as
After the dust charged by the fixed electrode plate is adsorbed to the rotating electrode plate, the dust is collected from the rotating electrode plate by the conveying belt and removed from the conveying belt by the conveying dust removing means. A rotary electrode type electrostatic precipitator,
Irregularities that are equally spaced in the longitudinal direction are formed on the inner surface of the conveyor belt, and irregularities that are equally spaced in the circumferential direction are formed on the peripheral surfaces of the drive pulley and the driven pulley, and the irregularities of the conveyor belt The rotating electrode type electrostatic precipitator is characterized in that the rotation of the driving pulley is transmitted to the transport belt by meshing the concave and convex portions of the driving pulley and the driven pulley.   The rotating electrode type electrostatic precipitator according to claim 1, wherein the uneven portion of the conveyor belt is formed by etching.   The rotating electrode type electrostatic precipitator according to claim 1 or 2, wherein tension means for applying a constant tension to the conveyor belt is provided. The tension means is a tension spring having hooks at both ends,
The conveyor belt is endless, the circumference of the conveyor belt is shorter than the circumference between the drive pulley and the driven pulley, and hook attachment holes are formed at both ends of the conveyor belt,
In a state where the conveyor belt is wound around the outer periphery of the driving pulley and the driven pulley, the hook is hooked on the hook mounting hole, thereby connecting the both ends of the conveyor belt and a constant tension on the conveyor belt. The rotating electrode type electrostatic precipitator according to claim 3, wherein   5. The drive pulley and the driven pulley are provided with a groove portion in a direction perpendicular to the axis thereof, and the groove portion is provided so as to be in contact with an outer diameter portion of the tension spring. The rotary electrode type electrostatic precipitator as described. At both ends of the conveyor belt, bent portions are provided inward,
6. The rotating electrode type electrostatic precipitator according to claim 5, wherein the groove is provided so as to accommodate the bent portion of the conveyor belt.   The rotating electrode type electrostatic precipitator according to claim 5 or 6, wherein the groove is provided with an uneven shape.   The rotating electrode type electrostatic precipitator according to claim 7, wherein the uneven shape is formed with knurled eyes.   The rotating electrode type electrostatic precipitator according to claim 1, wherein the concave and convex portions of the driving pulley and the driven pulley are formed by knurling eyes.   The rotating electrode type electrostatic precipitator according to claim 1, wherein a tip end portion of the conveyance dust removing means is provided so as to contact the conveyance belt of a portion wound around the driven pulley.   The rotating electrode type electrostatic precipitator according to claim 1 or 10, further comprising a spring that presses the conveying dust removing unit toward the conveying belt.