JP4341027B2 - Automatic screen - Google Patents

Description

  The present invention relates to an automatic screen, and more particularly to an automatic screen used for removing foreign substances contained in waste water or sewage in a waste water treatment apparatus.

  Wastewater treatment equipment is used to purify sewage discharged from factories and households. In the wastewater treatment apparatus, solid foreign matters contained in sewage or the like are removed in advance. Conventionally, in order to remove such foreign matter, as described in, for example, Patent Document 1, a wedge having a screen body in which wedge wires having a wedge-shaped cross section are arranged in a slit shape with a gap therebetween. A wire-type screen is used. In this screen, when the sewage passes through the screen main body, foreign matters larger than the interval between the wedge wires are caught by the screen main body, and the foreign matters contained in the sewage are removed.

  In a screen in such a wastewater treatment apparatus, foreign matter may be clogged in the gap between the wedge wire and the wedge wire with the operation time, and the screen main body may be clogged. In order to eliminate clogging of the screen body, the waste water treatment apparatus is provided with a rotating brush as a cleaning mechanism. The rotating brush rubs off the foreign matter clogged in the gap between the wedge wire and the foreign matter, thereby removing the foreign matter.

In addition to such rotating brushes, as a cleaning mechanism, a vibration mechanism that removes foreign matters by applying vibration to the screen body and a watering mechanism that flushes foreign matters by spraying the entire screen body have been proposed.
Japanese Patent Laid-Open No. 2001-259677

  However, the screen of the conventional waste water treatment apparatus has the following problems. That is, as described above, an additional cleaning mechanism such as a rotating brush or a vibration mechanism is required to eliminate clogging of the screen body.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an automatic screen that is used in a wastewater treatment apparatus and reliably prevents clogging of the screen body without providing an additional cleaning mechanism. Is to provide.

  An automatic screen according to the present invention is an automatic screen used for removing foreign matter in a wastewater treatment apparatus, and includes a first roller, a first groove, a second roller, a second groove, a third roller, and a third groove. And a wire and a drive unit. The first roller has a predetermined length. The first groove portion is formed in a spiral shape with a first pitch on the peripheral surface of the first roller. The second roller has a predetermined length and is disposed in parallel with the first roller at a distance from the first roller. The second groove is formed in a spiral shape with a second pitch larger than the first pitch on the peripheral surface of the second roller. The third roller is disposed in parallel with the first roller and the second roller at a distance from the first roller and the second roller. The third groove portion is formed in a spiral shape with a first pitch on the peripheral surface of the third roller. The wire includes, in the order of the first roller, the second roller, and the third roller, a portion of the first groove located on the most end side of the first roll, a portion of the second groove portion located on the most end side of the second roller, and From the third groove portion located on the most end side of the third roller, the first groove portion located on the other end side of the first roller, and the second groove portion located on the most other end side of the second roller And it is applied in a spiral manner over the third groove portion located on the most other end side of the third roller. The drive unit moves the wire in a certain direction. A screen body having a predetermined interval in which the interval between adjacent wire portions is based on the first pitch is constituted by the wire portion passed between the first roller and the third roller. In the wire portion passed between the first roller and the second roller and the wire portion passed between the second roller and the third roller, the interval between the adjacent wire portions is a predetermined distance based on the first pitch. It is configured to vary between the interval and the interval based on the second pitch.

  According to this configuration, the screen main body configured by the wires having a predetermined interval based on the first pitch can catch foreign matters larger than the interval, and in the screen main body, between the wires and the wires. Even if foreign matter is caught between the wires, the gap between the wires extends to an interval based on the second pitch, so that the caught foreign matter falls and can be removed. As a result, clogging of the screen body can be reliably eliminated without providing an additional cleaning mechanism.

  As a manner of placing the wire, the wire is a portion of the wire that covers the first groove portion located on the most end side of the first roller and a portion of the third groove portion that is located on the most other end side of the third roller. There is a mode in which the wire portion is connected to be endless and the wire is moved in an endless state.

  Moreover, as another aspect, the 1st winding part connected with the part of the wire concerning the part of the 1st groove part located in the one end side of the 1st roller, and winding up a wire, and the other end side of the 3rd roller And a second winding part that winds the wire connected to the wire part of the third groove part located on the wire, and the wire is alternately wound around the first winding part and the second winding part. There is a mode that is alternately moved in one direction and the other direction so as to be taken.

  In order to remove the foreign matter caught by the screen body, it is preferable to provide a foreign matter container for containing the foreign matter caught on the screen body on the downstream side in the moving direction of the wire in the screen body.

  The foreign matter container may have a function of conveying the caught foreign matter.

  Moreover, in order to remove the foreign material entangled with the wire itself, it is preferable to include a foreign material scraping part that scrapes the foreign material.

Embodiment 1
The automatic screen used for the waste water treatment apparatus according to Embodiment 1 of the present invention will be described. As shown in FIG. 1, in the automatic screen 1, the 1st roller 3, the 2nd roller 5, and the 3rd roller 7 are arrange | positioned at intervals in parallel with each other. As shown in FIG. 2, spiral grooves 33 are formed on the circumferential surface of the first roller 3 with a predetermined pitch (P ₁ ). As shown in FIG. 3, spiral grooves 55 are formed on the peripheral surface of the second roller 5 with a pitch (P ₂ ) larger than the pitch (P ₁ ). As shown in FIG. 2, spiral grooves 77 having a pitch (P ₁ ) are formed on the peripheral surface of the third roller 7 as in the first roller 3. The first roller 3 to the third roller 7 are preferably made of rubber, for example, but may be made of metal, resin, or the like.

  The wire 9 is spirally applied to the first roller 3, the second roller 5, and the third roller 7 in the order of the first roller 3, the second roller 5, and the third roller 7 with a predetermined tension. . The wire 9 is made of, for example, metal or synthetic resin. Moreover, the diameter of the wire 9 is about 0.5-1 mm.

  The method for placing the wire 9 will be described in more detail. As shown in FIG. 4, the wire 9 is first hung on the groove portion 33 a located on the most end side among the grooves 33 formed in the first roll 3. Next, the wire 9 hung on the groove portion 33 a is hung on the groove portion 55 a located on the most end side among the grooves 55 formed on the second roll 5, and then the groove 77 formed on the third roll 7. Of these, it is hung on the groove portion 77a located on the most end side.

  Next, the wire 9 includes a groove portion 33b located next to the groove portion 33a formed on the first roll 3, a groove portion 55b located next to the groove portion 55a formed on the second roll 5, and a third roll. 7 is sequentially applied to the groove portion 77b located adjacent to the groove portion 77a formed in FIG. Hereinafter, with respect to each groove portion of the spiral grooves 33, 55, 77 formed in the first roll 3, the second roll 5, and the third roll 7, respectively, from one end side (front side) to the other end side (back side) ) Toward the wire 9.

  And the part of the groove part 33c located in the other end side among the groove | channels 33 formed in the 1st roll 3, the groove part 55c located in the other end side among the grooves 55 formed in the 2nd roll 5, and Of the grooves 77 formed in the third roll 7, the wire 9 that is hooked in order on the groove portion 77 c located on the most other end is hooked on predetermined driven rollers 11, 13 to the first first roll 3. It connects with the wire part hung on the part of the groove part 33a located in the most one end side among the formed grooves 33. FIG.

  In this manner, the endless wire 9 is spirally hung on the first roller 3, the second roller 5, and the third roller 7. In order to move the wire 9 placed in a spiral shape in a predetermined direction, for example, a drive unit 8 for rotationally driving the first roller 3 is provided. The second roller 5 and the third roller 7 are driven rollers.

As shown in FIG. 1, among the wires 9 that are sequentially applied to the first roller 3, the second roller 5, and the third roller 7, the portion of the wire 9 that is passed between the first roller 3 and the third roller 7. Thus, the screen body 10 is configured. In the screen body 10, as shown in FIG. 5, the interval between the adjacent wires 9 is a constant interval L ₁ based on the pitch P ₁ of the grooves 33 and 77 formed in the first roller 3 and the third roller 7, respectively. Is held in.

On the other hand, as shown in FIG. 6, in the portion of the wire 9 passed between the first roller 3 and the second roller 5, the interval between the adjacent wires 9 is the pitch of the grooves 33 formed in the first roller 3. It will be spread from the interval L ₁ based on P ₁ until the interval L ₂ based on the pitch P ₂ of the groove 55 formed in the second roller 5. Then, the passed portion of the wire 9 between the second roller 5 and the third roller 7, the interval of the original spacing of the wire 9 adjacent based from the interval L ₂ based on the pitch P ₂ in the pitch P ₁ L It will be narrowed to ₁ .

Next, the operation of the above-described wastewater treatment apparatus will be described. As shown in FIG. 7, first, the wire 9 moves in the direction indicated by the arrow 31 by rotationally driving the first roller 3 as a driving roller. Sewage is poured onto the screen from a pipe 15 arranged on the upstream side in the moving direction of the wire 9 in the screen body 10. As shown in FIG. 8, the screen body 10, spacing _{L 1} larger than the foreign matter 17a~17c wire is caught among the foreign matter contained in the wastewater. Of the foreign substances caught in the screen body 10, the foreign matter sufficiently large foreign body 17a than the distance L ₁ of the wire 9, as shown in FIG. 9, which is disposed near the first roller 3 with the movement of the wire 9 It is accommodated in the accommodating part 18.

On the other hand, as shown in FIG. 8, the distance L ₁ and the same degree of magnitude of foreign matter 17b of the wire 9, in the case of 17c, the cause is sandwiched between the wire 9 and the wire 9 the adjacent dust containing portion 18 may not be accommodated. In this case, the foreign substances 17 b and 17 c sandwiched between the wires 9 move toward the second roller 5 through the first roller 3 as the wire 9 moves.

The passed portion of the wire 9 between the first roller 3 and the second roller 5, gradually as shown in FIG. 10, the distance between the wire 9 and the wire 9 adjacent the interval L ₁ until the distance L ₂ To spread. Thereby, the foreign matter 17b, 17c pinched | interposed between the wire 9 and the wire 9 falls, and is accommodated in a lower foreign matter accommodation part (not shown).

  On the other hand, the sewage that has passed through the screen main body 10 is received by the sewage receiver 16 disposed below the screen 10 and sent to a processing device or the like for performing the next processing. In this way, the foreign matter contained in the sewage is caught by the screen body 10 and the foreign matter caught by the screen body 10 is removed from the wire 9.

According to the automatic screen 1 described above, among the wire 9 which is subjected to spiral relative to the first roller 3 third roller 7, a spiral groove 33,77 respectively with the same pitch P ₁ is formed first The screen main body 10 is constituted by the portion of the wire 9 passed between the roller 3 and the third roller 7. The screen body 10, it is possible to remove it by separating the larger foreign matter than the interval L ₁ from sewage.

Further, in the portion of the wire 9 passed between the first roller 3 and the second roller 5, the interval between the adjacent wires 9 is the interval L based on the pitch P ₁ of the grooves 33 formed in the first roller 3. It is assumed that there is a foreign matter sandwiched between the wire 9 and the wire 9 in the screen body 10 by expanding from ₁ to the interval L ₂ based on the pitch P ₂ of the groove 55 formed in the second roller 5. However, such a trapped foreign object can be dropped and removed.

  Thus, in the automatic screen 1, the screen body 10 is constituted by the moving wire 9, and the moving wire 9 is provided with a portion wider than the space in the screen body 10, thereby adding an additional material such as a brush. Thus, the clogging of the screen body 10 can be surely eliminated without providing a typical cleaning mechanism.

  In addition, by changing the pitch of the spiral grooves formed on the peripheral surfaces of the first roller 3 and the third roller 7, the interval between the wires 9 forming the screen body 10 can be easily set to a predetermined interval according to the application. Can be set to

  For the foreign matter entangled with the wire 9 itself, for example, as shown in FIG. 11, a pipe-like foreign material scraper 19 may be attached to the wire 9. Moreover, in order to convey the foreign material accommodated in the foreign material accommodation part 18, the foreign material accommodation part 18 may be provided with conveyance functions, such as a belt conveyor, for example.

Embodiment 2
In the automatic screen described above, the case where the wire is endless is taken as an example. Here, an automatic screen of a type that winds up a wire is taken as an example. As shown in FIG. 12, a wire winder 20 for winding the wire 9 is disposed above the first roller 3. A wire winder 21 for winding the wire 9 is also disposed above the third roller 7. The wire winder 20 is connected to, for example, a portion of the wire 9 that covers a groove portion located on the most end side among the grooves formed in the first roller 3. The wire winder 21 is connected to the portion of the wire 9 that covers the groove portion located on the other end side among the grooves formed in the third roller 7.

  A drive unit 8 for winding the wire 9 is provided on both the wire winders 20 and 21. For this reason, the first roller 3 to the third roller 7 are all driven rollers. The manner in which the wire 9 is applied to the first roller 3 to the third roller 7 is the same as that of the waste water treatment apparatus described above. Accordingly, the screen body 10 is constituted by the wire 9 passed between the first roller 3 and the third roller 7. A pipe 15 for pouring dirty water is disposed above the screen body 10. The pipe 15 is provided with two spouts 15a and 15b on the first roller 3 side and the third roller 7 side in order to pour sewage in accordance with the winding direction of the wire winders 20 and 21. Yes.

  Next, the operation of the above-described automatic screen 1 will be described. First, as an initial state, it is assumed that the wire 9 is wound around the wire winder 20 as shown in FIG. From this state, as shown in FIG. 13, the drive unit 8 provided in the wire winder 21 starts driving, and the wire 9 gradually moves to the wire winder 21 while moving in the direction indicated by the arrow 32. It will be wound on. In this state, of the spouts 15 a and 15 b disposed above the screen body 10, sewage enters the screen body 10 from the spout 15 b located on the upstream side in the movement direction of the wire 9 (the third roller 7 side). Poured towards.

  In the screen main body 10, foreign matters larger than the distance between the wires 9 among the foreign matters contained in the sewage are captured, similarly to the automatic screen described above. The caught foreign matter is accommodated in a foreign matter accommodation portion (not shown) provided on the first roller 3 side. In addition, the foreign matter sandwiched between the wires 9 falls at the portion of the wire 9 passed between the first roller 3 and the second roller 5 and has a foreign matter storage portion (not shown) below. ).

  When the wire 9 is wound around the wire winder 21, the drive unit 8 on the wire winder 21 side stops. Next, as shown in FIG. 14, the drive unit 8 on the wire winder 20 side starts driving, and the wire 9 is gradually wound around the wire winder 20 while moving in the direction indicated by the arrow 33. It will be. In this state, of the spouts 15a and 15b arranged above the screen 10, sewage is directed to the screen body 10 from the spout 15a located on the upstream side in the moving direction of the wire 9 (on the first roller 3 side). Poured.

  In the screen body 10, foreign matters larger than the distance between the wires 9 among the foreign matters contained in the sewage are captured. The caught foreign matter is accommodated in a foreign matter accommodation portion (not shown) provided on the third roller 7 side. In addition, the foreign matter sandwiched between the wires 9 falls at the portion of the wire 9 passed between the third roller 7 and the second roller 5 and is placed below the foreign matter storage portion (not shown). ). In this way, the wire 9 is alternately wound around the wire winder 20 and the wire winder 21, and foreign matter is captured by the screen body 10 during that time.

In the automatic screen described above, similarly to the automatic screen described above, the screen body 10 constituted by a wire 9 having a predetermined interval based on the pitch P _1, it is possible to catch larger foreign matter than the interval, moreover, a screen In the main body 10, even when a foreign object is pinched between the wires 9, the foreign object pinched by the interval between the wires 9 falling can be removed. Thereby, clogging of the screen main body 10 can be reliably eliminated without providing an additional cleaning mechanism such as a brush.

  The embodiment disclosed this time is illustrative in all points and is not restrictive. The present invention is defined by the terms of the claims, rather than the scope described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a perspective view of the automatic screen which concerns on Embodiment 1 of this invention. In the same embodiment, it is a partial side view which shows a 1st roller or a 3rd roller. In the embodiment, it is a partial side view showing a second roller. In the same embodiment, it is a perspective view for demonstrating how to wire. In the same embodiment, it is a fragmentary perspective view which shows the part of the wire passed between the 1st roller and the 3rd roller. In the same embodiment, it is a fragmentary perspective view which shows the part of the wire passed between the 1st roller and the 2nd roller or between the 2nd roller and the 3rd roller. In the same embodiment, it is a side view for demonstrating operation | movement of an automatic screen. In the embodiment, it is a fragmentary perspective view which shows a mode that a foreign material is caught by the screen. In the same embodiment, it is a side view which shows a mode that the foreign material caught by the screen is removed. In the same embodiment, it is a fragmentary perspective view which shows a mode that the foreign material pinched | interposed between the wires falls. In the embodiment, it is a fragmentary perspective view which shows the scraper for removing the foreign material entangled with the wire. It is a side view of the automatic screen which concerns on Embodiment 2 of this invention. In the embodiment, it is a side view showing a first state for explaining the operation of the automatic screen. In the same embodiment, it is a side view showing the 2nd state for explaining operation of an automatic screen.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Automatic screen, 3 1st roller, 5 2nd roller, 7 3rd roller, 8 Drive part, 9 Wire, 10 Screen main body, 11, 13 Roller, 15 Pipe, 15a, 15b Spout, 16 Sewage receiving part, 17a , 17b, 17c Foreign material, 18 Foreign material container, 19 Foreign material scraper, 20, 21 Wire winder, 33, 55, 77 groove, 33a, 33b, 33c, 55a, 55b, 55c, 77a, 77b, 77c groove portion.

Claims (6)

An automatic screen used to remove foreign matter in a wastewater treatment device,
A first roller having a predetermined length;
A spiral-shaped first groove formed on the circumferential surface of the first roller with a first pitch;
A second roller having a predetermined length and disposed parallel to the first roller at a distance from the first roller;
A spiral second groove formed on the peripheral surface of the second roller with a second pitch larger than the first pitch;
A third roller disposed in parallel to the first roller and the second roller at a distance from the first roller and the second roller;
A spiral-shaped third groove formed on the circumferential surface of the third roller with the first pitch;
In the order of the first roller, the second roller, and the third roller, the portion of the first groove located on the most end side of the first roll, the second position located on the most end side of the second roller. From the groove portion and the third groove portion located on the most end side of the third roller, the first groove portion portion located on the most other end side of the first roller and the other end of the second roller A wire that is sequentially spiraled across the portion of the second groove located on the side and the portion of the third groove located on the most other side of the third roller;
A drive unit for moving the wire in a certain direction,
The wire portion passed between the first roller and the third roller constitutes a screen body having a predetermined interval in which the interval between adjacent wire portions is based on the first pitch,
In the wire portion passed between the first roller and the second roller and the wire portion passed between the second roller and the third roller, the interval between adjacent wire portions is the first portion. An automatic screen configured to vary between a predetermined interval based on pitch and an interval based on the second pitch. The wire includes a portion of the wire that covers the portion of the first groove located on the most end side of the first roller and a portion of the wire that covers the portion of the third groove portion located on the most other end side of the third roller. The parts are connected and endless,
The automatic screen of claim 1, wherein the wire is moved in an endless state. A first winding portion that is connected to a portion of the wire applied to a portion of the first groove portion located on the most end side of the first roller and winds the wire;
A second winding portion that is connected to a portion of the wire that covers the portion of the third groove located on the most other end side of the third roller and winds the wire;
The automatic screen according to claim 1, wherein the wire is alternately moved in one direction and the other direction so as to be alternately wound around the first winding portion and the second winding portion.   The automatic screen according to any one of claims 1 to 3, further comprising a foreign matter storage portion for storing foreign matter caught on the first screen on the downstream side of the screen in the moving direction of the wire.   The automatic screen according to claim 4, wherein the foreign matter container has a function of conveying the contained foreign matter.   The automatic screen in any one of Claims 1-5 provided with the foreign material scraping part for removing the foreign material entangled with the said wire.

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