JP2011132641A - Screen drum - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screen drum in which foreign matters can hardly stick to a plurality of holes without spoiling a draining function. <P>SOLUTION: In the screen drum, equipped with a drum 12 having a cylindrical shape with a plurality of holes on the outer peripheral surface 12g with a spiral screw blade 18 attached on the inner peripheral surface 12f and a washing water discharge port 21 for feeding washing water W into the drum 12, to feed a raw material G and washing water W to the inside of the drum 12, and to rotate the drum 12 and discharges the foreign matters after washing by moving the foreign matters along the spiral shape of the screw blade 18, holes 16, 17 are formed so that the hole diameter on the downstream side R may be larger than that on the upstream side L of movement of the foreign matters. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a screen drum that cleans and drains a raw material on which foreign substances collected from an auxiliary disaggregator of a pulper are collected, and discharges the foreign substances after cleaning.

  In the papermaking raw material disaggregation process performed using the pulper, the waste paper put into the pulper is disaggregated in a state where papermaking raw materials and foreign matters (hereinafter referred to as raw materials) are mixed, and the selected papermaking raw material is sent to the next process. . On the other hand, the foreign matter selected by the pulper gradually accumulates in the pulper, and as it is, the processing capacity of the pulper is lowered. Further, even if the foreign matter is subdivided, it is postponed and affects the next process.

  For this reason, the processing of the pulper is interrupted in the middle of the processing, and foreign matter accumulated in the pulper container is blown. However, since interrupting the operation reduces the production capacity of the pulper, a system that continuously removes foreign matters without blowing is currently used.

  In this system for removing foreign matter, a screen drum is used for cleaning a raw material containing a large amount of foreign matter from the auxiliary disaggregator, draining it, and selectively discharging the cleaned foreign matter.

  This screen drum includes a drum in which a screen plate having a plurality of holes is formed in a cylindrical shape. One cylinder end of the drum is closed, and the closed cylinder end side is connected to the driving device and rotates. The other cylinder end is open, and the raw material before cleaning is supplied from this open end to the cylinder end side closed in the drum by the pipe.

  The raw material supplied into the drum is washed with washing water supplied into the rotating drum. From the plurality of holes described above, washing water containing a large amount of papermaking raw material is collected for washing and sent again into the pulper. On the other hand, the foreign matter remains in the screen drum without passing through the plurality of holes, and moves to the open end side as the screen drum rotates. On the open end side, a discharge port for discharging foreign matter after cleaning is provided.

  As described above, the plurality of holes in the drum have a function of collecting the washed papermaking raw material outside the drum, and a function of draining the cleaning water from foreign matters remaining in the drum. If this hole diameter is reduced, the possibility of foreign matter being mixed into the papermaking raw material collected outside the drum is reduced, while the possibility of easily closing the hole with foreign matter is increased, and the draining action is inevitably weakened. On the other hand, if the hole diameter is increased with emphasis on the draining action, relatively small foreign matter will pass through the hole together with the papermaking raw material.

  The present invention has been made in view of the above-described circumstances, and provides a screen drum that can prevent foreign matter from sticking to (or hardly close to) a plurality of holes of the drum and that does not impair the function of draining water. It is.

  In order to solve the above-mentioned problems, the present invention has a cylindrical shape having a plurality of holes on the outer peripheral surface, and a drum having spiral screw blades attached to the inner peripheral surface, and supplies cleaning water into the drum. A screen drum having a cleaning water discharge port, supplying the raw material and the cleaning water to the inside of the drum, rotating the drum, and moving the cleaned foreign matter along the spiral shape of the screw blades The hole is formed such that the hole diameter on the downstream side is larger than the upstream side on which the foreign substance moves.

  The drum is divided into an upstream cleaning area where the foreign matter moves and a downstream dewatering area, and the hole diameter of the hole located in the dewatering area is the hole diameter of the hole located in the cleaning area. Is bigger than.

  Further, the screw blade is formed in a spiral shape around the rotation axis of the drum, and the foreign matter moves along the rotation axis of the drum and is discharged from a discharge port at the end of the drum. The drum may be attached to be inclined such that the downstream side is lower than the upstream side where the foreign matter moves.

  Further, the screw blade may be provided with a scraping plate that scrapes the foreign matter in the rotation direction of the drum.

  Furthermore, the scraper may be provided on the upstream side of the drum.

  In the screen drum according to the present invention, since the hole is formed such that the hole diameter on the downstream side is larger than the upstream side on which the foreign matter moves, the papermaking raw material is removed from the hole by washing on the upstream side of the drum. In addition to being able to flow down, even if foreign matter after cleaning accumulates in a hole having a large diameter on the downstream side of the drum, the hole is not completely blocked, so that the draining function is not impaired.

It is a front view of the screen drum which concerns on this invention. FIG. 2 is a top view of FIG. 1. It is a left view of FIG. It is an expanded view of the drum used with a screen drum. It is sectional drawing which shows the single-piece | unit of a drum. It is AA sectional drawing of FIG. FIG. 5 is a schematic diagram for explaining a cleaning cycle in the drum, and is a cross-sectional view seen from the drive unit 30 side. It is a schematic diagram for demonstrating the inclination angle of a drum. It is a schematic diagram for demonstrating a scraping board.

  Hereinafter, screen drums according to embodiments of the present invention will be described in detail with reference to the drawings.

  1 is a front view of the screen drum 1, FIG. 2 is a top view of FIG. 1, and FIG. 3 is a left side view of FIG.

  As shown in FIG. 1, the screen drum 1 includes a cleaning unit 10 and a drive unit 30 that drives the cleaning unit 10, and the cleaning unit 10 and the drive unit 30 are assembled on the mount 3. ing.

  The cleaning unit 10 includes an outer case 11 that constitutes an outer shell, and a drum 12 that is assembled inside the outer case 11.

  The outer case 11 is formed in a substantially cylindrical shape, and is located on the lower side of the cylindrical portion 11a formed so as to cover the outer side of the drum 12, and is cleaned in the drum 12. And a funnel-shaped stacking portion 11b for receiving the papermaking raw material flowing down. In addition, a papermaking raw material recovery port 23 is provided at the bottom of the stacking unit 11b.

  The outer case 11 is provided with a cleaning pipe 14a.

  As shown in FIGS. 1 and 2, the cleaning pipe 14 a is piped between the drum 12 and the outer case 11. Further, the cleaning pipe 14 a extends from the cleaning water supply port 13 a on the right side of the outer case 11 over the entire length in the longitudinal direction of the drum 12 (left and right direction in FIG. 1). A plurality of cleaning water outlets 21a (see FIG. 7 described later) are provided on the outer peripheral wall portion of the cleaning pipe 14a, and the cleaning water W is discharged from the cleaning water outlet 21a. On the other hand, a plurality of cleaning pipes 14 b are provided inside the drum 12. The tip of the cleaning pipe 14b has a nozzle shape for enhancing the cleaning effect, and the cleaning water W is discharged from the cleaning water discharge port 21b.

  Further, a height adjustment mechanism 15 for adjusting the inclination of the cleaning unit 10 is attached to the outer side portions 11c and 11c of the outer case 11 (both side portions in the left-right direction in FIG. 3). As shown in FIGS. 1 to 3, the height adjusting mechanism 15 extends vertically, and an upper end side 15 a is rotatably attached to the outer portion 11 c of the outer case 11. The lower end side 15 b of the height adjustment mechanism 15 is attached to the lower gantry 3. The height adjusting mechanism 15 has a structure in which the length can be adjusted using, for example, a spline or the like. After adjusting the inclination of the cleaning unit 10, the height adjusting mechanism 15 is fixed with a nut 15c to hold the inclination.

  The outer case 11 has a left end portion shown in FIG. 1 supported by the gantry 3 and a central portion in the longitudinal direction supported by the height adjusting mechanism 15. Further, the cleaning unit 10 (including the drum 12) is tilted so that the right side portion (details will be described later, dewatering area, downstream side) of FIG. 1 is higher than the left side portion (described later, cleaning area, upstream side). It is attached.

  FIG. 4 is a development view of the drum 12. 5 is a cross-sectional view showing a state in which the drum 12 alone is cut at the center, and FIG. 6 is a cross-sectional view taken along line AA of FIG.

  The drum 12 is obtained by forming a flat screen plate having a plurality of holes into a cylindrical shape. The left side portion 12a (the driving portion 30 side in FIG. 1; the inclined lower portion) of the drum 12 is closed by the closing plate 22, and the right side portion 12b (inclined upper portion) is open. Further, as shown in FIG. 1, the right side portion 12 b protrudes from the right side opening 11 d of the outer case 11 and is located outside the outer case 11. The opening of the right side portion 12b serves as a discharge port for foreign matter after cleaning.

  The above-described closing plate 22 is provided with a rotating shaft 12c connected to a driving unit 30 described later, and the drum 12 rotates around the rotating shaft 12c.

  As shown in FIG. 4, the drum 12 is configured using a single flat plate having a plurality of holes 16 and 17 formed on substantially the entire surface, and the upper and lower ends of this flat plate (up and down in FIG. 4). Are rolled into a cylindrical shape so that they face each other. That is, a plurality of holes 16, 17 are formed in the outer peripheral surface 12 g of the drum 12. As shown in FIG. 4, these holes 16 and 17 have a hole 17 in the right portion R (dehydration area R) and a hole 16 in the left portion L (cleaning area L) from the center of the drum 12. . The hole 17 has a larger diameter than the hole 16.

  Although these holes 16 and 17 will be described in detail later, a function of cleaning the raw material G supplied to the inner space S of the drum 12 to recover the papermaking raw material cleaned to the outside of the drum 12 and the cleaning water W It functions to flow down to the outside of the drum 12 and drain the remaining foreign matter.

  The above-described cleaning pipe 14a is provided to wash away papermaking raw materials and foreign matters stuck to these holes 16 and 17 by supplying cleaning water from the outside of the drum 12.

  Further, as shown in FIG. 1, a supply for supplying the raw material G (mixture of papermaking raw material and foreign matter) rejected by an auxiliary disintegrator of the pulper, which is an upstream process, into the screen drum is provided inside the drum 12. A pipe 20 is inserted. The supply port 20 a of the supply pipe 20 extends to the vicinity of the left side portion 12 a of the drum 12 so that the raw material G is supplied to the cleaning area L on the inner left side of the drum 12.

  As shown in FIG. 5, a screw blade 18 and a scraper plate 19 attached to the screw blade 18 are provided on the inner peripheral surface 12 f of the drum 12.

  The screw blade 18 is formed in a spiral shape around the same axis as the central axis of the drum 12. As shown in FIG. 5, the screw blades 18 are provided continuously from the left side 12 a to the right side 12 b of the drum 12. Further, the spiral of the screw blade 18 is formed so as to rotate clockwise in the direction from the left side 12a of the drum 12 to the right side 12b. This clockwise direction is the direction Q (see FIG. 7) in which the drum 12 rotates.

  The screw blade 18 is produced by processing a flat plate, and is attached to the inner peripheral surface 12f of the drum 12 by welding at a substantially right angle.

  As shown in FIG. 5, the scraper plate 19 is formed so as to extend from the left side 12 a of the drum 12 to a position slightly on the right side of the center (a position that slightly enters the dewatering area R). Further, as shown in FIG. 6, six scrapers 19 are provided at intervals in the circumferential direction. The scraper plate 19 has a flat plate shape, and the plane of the scraper plate 19 is attached substantially perpendicular to the plane of the screw blade 18. Further, the plane of the scraping plate 19 is arranged so that the center of the drum 12 is positioned on an extension line of the plane. The scraper plate 19 is attached to the plane of the screw blade 18 by welding.

  As shown in FIGS. 5 and 6, a flange portion 12 d that protrudes in the outer circumferential direction is provided at the left end portion of the drum 12. A plurality of attachment holes 12e are formed in the flange portion 12d along the circumferential direction, and the closing plate 22 described above is attached by passing a fastening member (not shown) through the attachment holes 12e.

  Returning to FIGS. 1 to 3, the drive unit 30 includes a drive motor 31 and a drive shaft 33 positioned on the inclined pedestal 32. The inclined pedestal 32 is attached to the gantry 3 and rotatably supports the drive shaft 33 via bearings 34a and 34b.

  The drive motor 21 and the drive shaft 33 are wound and transmitted by a chain 35. The drive shaft 33 is inclined along the inclined surface of the inclined pedestal 32, and the rotary shaft 12c of the drum 12 is connected to the end of the shaft. The seating surface alignment between the inclined pedestal 32 and the gantry 3 is performed by adjusting the height adjusting mechanism 15 described above.

  Next, the operation of the screen drum 1 will be described.

  7 is a schematic diagram for explaining the inclination angle θ of the drum 12, FIG. 8 is a schematic diagram for explaining the scraping plate 19, and FIG. 9 is a schematic diagram for explaining a cleaning cycle in the drum 12. It is a figure and it is the figure seen from the drive part 30 side.

  The screen drum 1 is for cleaning the raw material G supplied into the drum 12 and discharging foreign matters after draining.

  The driving force of the driving motor 31 is transmitted to the driving shaft 33 and the rotating shaft 12c through the chain 35, whereby the drum 12 rotates. The raw material G is supplied from the supply pipe 20 to the left portion L of the rotating drum 12. Further, the cleaning water W supplied from the cleaning water inlets 13a and 13b is discharged to the drum 12 from the cleaning water outlets 21a and 21b through the pipes 14a and 14b.

  The raw material G supplied to the inner space S of the drum 12 moves while being stirred with the washing water W from the left end 12a to the right end 12b in the drum 12 by the screw blade 18 as the drum 12 rotates. It will be.

  This stirring / washing process will be described with reference to FIG. 7. FIG. 7A shows a state before the raw material G is stirred. In this state, the raw material G is deposited on the lower side by its own weight. In FIG. 7A, for convenience of explanation, the raw material G is shown as being deposited between two adjacent scraping plates 19.

  FIG. 7B shows a state in which the drum 12 is rotated in the Q direction from the state of FIG. In this state, the raw material G is lifted from the lower side to the upper side of the drum 12 by the scraper 19 while moving along the screw blades 18. Further, the raw material G that has passed over the scraping plate 19 moves to a region partitioned by the adjacent scraping plate 19. By repeating this movement, the raw material G is conveyed to the right portion R of the drum 12.

  FIG. 7C shows a state in which the drum 12 is further rotated from the state shown in FIG. The foreign matter lifted upward in the rotational direction Q by the scraper 19 drops away from the scraper 19 at a predetermined height. That is, since the scraping plate 19 extends toward the central axis of the drum 12, the raw material G slides down along the plane of the scraping plate 19 when it is lifted above half of the drum 12, and moves downward. And fall. At this time, the raw material G is cleaned by discharging the cleaning water W from the cleaning water outlet 21 of the cleaning pipe 14b toward the raw material G.

  By being washed with the washing water W in this way, the raw material G is made from the papermaking raw material (collected from the hole 16) and foreign matter (moved along the screw blade 18 and discharged from the right end portion 12b of the drum 12). And decomposed.

  Here, the inclination of the drum 12 will be described. When the drum 12 is not inclined as shown in FIG. 8A, the raw material G moves along the spiral shape of the screw blade 18 at a constant speed in the drum 12 toward the right end portion 12b. (The movement process of the raw material G is indicated by the arrow T1 in FIG. 8 (a)).

  On the other hand, when the drum 12 is tilted by an angle θ as shown in FIG. 8B, the raw material G is lifted upward by the scraping plate 19 and falls downward by its own weight. It falls to the rear side (left side of the drum 12) by a distance determined by θ (the movement stroke of the raw material G is indicated by an arrow T2 in FIG. 8B). Therefore, the raw material G returns to the left end portion 12a side. Thus, assuming that the rotation speed of the drum 12 is the same, the material G can remain in the drum 12 for a longer time when the drum 12 is inclined. Therefore, it is possible to ensure a longer cleaning time.

  Further, as shown in FIG. 9A, when the raw material G moves along the spiral shape of the screw blade 18, the raw material G moves at a constant speed without the scraper 19 (FIG. 9A). ) Shows the travel of the raw material G by the arrow T3).

  On the other hand, when the scraper plate 19 is provided as shown in FIG. 9B, the raw material G must go over the scraper plate 19 (the movement stroke of the raw material G is indicated by an arrow T4 in FIG. 9B). ). Therefore, a part of the raw material G in the drum 12 stays between the adjacent scraping plates 19. Thereby, the time for the raw material G to remain in the drum 12 is lengthened. Therefore, it is possible to ensure a longer cleaning time.

  The raw material G staying and stirring in the drum 12 in this manner is first washed in the left portion L (washing area L) of the drum 12, and the washed papermaking raw material and washing water flow down from the holes 16. At this time, the scraping plate 19 is provided a little beyond the left portion L of the drum 12 and the right portion R past the left portion L, so that the stirring and cleaning time of the raw material G in the cleaning area L becomes longer. I have to. The papermaking raw material that has flowed down from the drum 12 is collected by the accumulating unit 11b shown in FIG. 1 and sent out of the apparatus.

  On the other hand, the raw material G larger than the hole diameter of the hole 16 (at this time, the papermaking raw material is recovered and only the foreign matter remains) remains in the inner space S and remains on the right side portion R (dehydration area) of the drum 12. R). At this time, since the scraping plate 19 is not provided in the right portion L of the drum 12, the raw material G is not directly washed with the washing water W (see FIG. 7C), and the screw blade 18 It moves without stagnating along the spiral shape. And in this right side part, the water | moisture content in the raw material G is removed and spin-dry | dehydrated from the hole 17 which has a larger diameter than the hole 16. FIG. At this time, the foreign matter is dehydrated to some extent on the left side portion of the drum 12, so that it is in a solid form containing a little water. Therefore, only water flows down to the lower side of the drum 12 through the hole 17, and the raw material G (mainly foreign matter in the dewatering area R) does not flow down from the hole 17.

  According to the screen drum according to the embodiment of the present invention, the drum 12 is divided into the upstream washing area L where the raw material G moves and the downstream dewatering area R, and the hole 17 located in the dewatering area R. Is larger than the hole diameter of the hole 16 located in the cleaning area L, the raw material G is cleaned in the cleaning area L and the papermaking raw material flows down from the hole 16, and in the dewatering area R, the hole 17 The water in the raw material G can be cut off. Therefore, it is not necessary to make the hole 16 in the cleaning area L larger than necessary to prevent the papermaking raw material from sticking, and only the papermaking raw material to be discharged can flow down through the hole 16. On the other hand, since the washing water can be collected from the large hole 17 in the dewatering area R without making the hole 16 large, it is possible to prevent the washing water from being easily drained.

  Further, the screw blade 18 is formed in a spiral shape around the rotation axis of the drum 12 so that the raw material G moves along the rotation axis of the drum 12 and is discharged from the discharge port of the end 12b of the drum 12. The drum 12 is attached so as to be inclined so that the downstream side R is lower than the upstream side L where the raw material G moves, so that the raw material G moving in the drum 12 is on the left end 12a side. Thus, the raw material G can remain in the drum 12 for a long time. Therefore, it is possible to ensure a longer cleaning time.

  Further, since the screw blade 18 is provided with a scraping plate 19 that scrapes the raw material G in the rotation direction of the drum 12, the raw material G has to go over the scraping plate 19, and the raw material G enters the drum 12. G can remain for a long time. Therefore, it is possible to ensure a longer cleaning time.

  Furthermore, since the scraper 19 is provided on the upstream side L, which is the cleaning area L of the drum 12, the raw material G can remain in the cleaning area L for a long time. Therefore, the raw material G can be sufficiently washed, and the residence time in the dewatering area R where only drainage is performed can be made shorter than the residence time in the washing area L. Therefore, it is possible to perform the work time for the whole process only for the time required for cleaning and dehydration.

  The screen drum according to the embodiment of the present invention has been described above, but the present invention is not limited to the above-described embodiment, and various modifications and changes can be made based on the technical idea of the present invention. .

  For example, in the present embodiment, the hole 16 is provided in the left portion of the drum 12 and the hole 17 having a diameter larger than that of the hole 16 is provided in the right portion. However, the present invention is not limited to this configuration. That is, the hole diameters of the plurality of holes provided in the drum 12 may be such that the hole diameters increase from the left side to the right side. Thereby, it becomes easy to discharge | emit and dehydrate the water | moisture content contained in the raw material G with a big hole as it goes to the right side from the left side. At this time, since the raw material G becomes solid containing moisture as it goes to the right side, only moisture can be recovered without foreign matter flowing down from the large hole.

  In the screen drum according to the present embodiment, the structure in which the raw material G moves from the left side to the right side of the drum 12 has been described. However, the structure may move from the right side to the left side. Even in this case, it is only necessary to form a plurality of holes in the drum 12 so that the hole diameter becomes larger in the moving direction.

DESCRIPTION OF SYMBOLS 1 Screen drum 3 Base 10 Washing part 11 Outer case 11a Cylindrical part 11b Stacking part 11c Outer part 12 Screen drum 12a Left side part 12b Right side part 12c Rotating shaft 12d Flange part 12e Mounting hole 12f Inner peripheral surface 12g Outer peripheral surface 13a, 13b Cleaning Water supply port 14a, 14b Piping 15 Height adjustment mechanism 15a Upper end 15b Lower end 15c Nut 16, 17 Hole 18 Screw blade 19 Scraper 20 Supply pipe 20a Supply port 21 Washing water outlet 22 Closure plate 23 Recovery port 30 Drive unit 31 Drive motor 32 Inclined pedestal 33 Drive shaft 34a, 34b Bearing 35 Chain L Left part (cleaning area)
R Right side (dehydration area)
G Raw material Q Drum rotating direction S Drum inner space T1, T2 Foreign matter moving direction W Wash water θ Inclination angle

Claims (5)

The drum has a cylindrical shape with a plurality of holes on the outer peripheral surface, and a spiral screw blade attached to the inner peripheral surface, and a cleaning water discharge port for supplying cleaning water into the drum. In the screen drum that supplies the raw material and the cleaning water to the inside, rotates the drum, and moves and discharges the foreign matter after cleaning along the spiral shape of the screw blades,
The screen drum, wherein the hole is formed such that the hole diameter on the downstream side is larger than the upstream side on which the foreign substance moves.   The drum is divided into an upstream cleaning area where the foreign matter moves and a downstream dewatering area, and the hole diameter of the hole located in the dewatering area is larger than the hole diameter of the hole located in the cleaning area. The screen drum according to claim 1, wherein the screen drum is enlarged.   The screw blade is formed in a spiral shape around the rotation axis of the drum, and the foreign matter moves along the rotation axis of the drum and is discharged from a discharge port at the end of the drum. The screen drum according to claim 1, wherein the drum is attached so as to be inclined so that the downstream side is lower than the upstream side where the foreign substance moves.   The screen drum according to claim 3, wherein the screw blade is provided with a scraping plate that scrapes the foreign matter in the rotation direction of the drum.   The screen drum according to claim 4, wherein the scraper plate is provided on an upstream side of the drum.

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