JP4036816B2 - Belt type concentrator - Google Patents

Description

  The present invention relates to a belt type concentrator used for concentration of surplus sludge (mixed raw sludge, digested sludge, OD surplus sludge) in a sewage treatment plant, for example.

  Conventionally, as this type of belt type concentrator, for example, as shown in FIG. 17, a pair of rollers 62 is provided on a gantry 61, and an endless belt 63 having a wire mesh structure is stretched between the two rollers 62. There is a type in which the endless belt 63 is rotated by being driven to rotate, and the concentration target sludge is gravity filtered while being transported by the endless belt 63 along the transport track 64.

  The gantry 61 is provided with a plurality of carrier rollers 65 that support the endless belt 63 on the conveyance track 64 from below. The axis of the carrier roller 65 is set in a direction orthogonal to the conveyance track 64, and each carrier roller 65 extends in the width direction of the endless belt 63 (see, for example, Patent Document 1).

According to this, the desorbed water desorbed from the sludge to be concentrated by gravity on the transport track 64 passes from the upper surface to the lower surface of the endless belt 63 and is drained below the endless belt 63.
However, in the above-described conventional type, the carrier roller 65 has a low draining effect on the endless belt 63, and therefore, the detached water adhering to the lower surface of the endless belt 63 is not reliably removed, and the drainage of the endless belt 63 is hindered. There is a problem that the drainage of the desorbed water below the endless belt 63 cannot be improved, and the endless belt 63 is easily clogged.
JP 2002-326006 A

  The present invention provides a belt-type concentrator that can promote the draining effect on the endless belt and that can reduce clogging of the endless belt by improving drainage of drained water below the endless belt. The purpose is to provide.

In order to achieve the above object, the first invention of the present invention is a belt type concentrator equipped with a rotatable and water-permeable endless belt that gravity-filters while conveying the sludge to be concentrated, wherein the endless belt is a wire rod And a mesh-like belt body that is stretchable in the traveling direction, and a chain that is attached to both side edges of the belt body through a plurality of mounting members and has rigidity in the traveling direction. The belt body has a large number of apertures communicating with the front surface and the back surface, and the chain is wound between rotatable sprockets arranged on the start end side and the end end side of the transport track, The members are provided at predetermined pitches in the direction of travel of the endless belt, and valleys that are bent downward are formed between the mounting members of the belt main body. A plurality of support plates that are supported by the belt are arranged at predetermined intervals in the conveyance track direction, and when the lower surface of the belt body slides on the support plates and passes over the support plates, the valley portions of the belt body are lifted by the support plates. In the peak portion , the opening portion is enlarged on the front surface side of the belt main body, and in the valley portion, the opening portion is enlarged on the back surface side of the belt main body .

  According to this, by rotating the sprocket, the endless belt rotates while being supported by the plurality of support plates. At this time, since the lower surface of the belt main body is in sliding contact with each support plate, the draining effect on the lower surface of the belt main body is exhibited. Compared with the conventional carrier roller, the desorbed water attached to the lower surface of the belt main body is reliably removed, The drainage of the belt body is promoted. Thus, since each support plate has two functions of supporting the endless belt and draining function, it is highly convenient and the number of parts can be reduced.

  In addition, the belt body extends in the traveling direction with respect to the chain due to the weight of the belt body and the weight of the sludge to be concentrated on the belt body on the conveyance track. A trough that is bent is formed. In this state, when the endless belt rotates and passes over the support plate, the valley portion of the belt body is lifted by the support plate to generate a peak portion, and after passing over the support plate, returns to the valley portion. As a result, valleys and ridges are alternately generated in the belt body of the endless belt on the conveyance track, and the opening portion is enlarged on the upper surface (front surface) side of the belt body in the above ridges. Water absorption from the belt to the belt body is promoted. Moreover, in the said trough part, since an opening part is expanded in the lower surface (back surface) side of a belt main body, the drainage below from a belt main body is accelerated | stimulated. Thereby, the water absorption and drainage of the endless belt are improved, and clogging of the endless belt is reduced.

  According to the present invention, since the lower surface of the belt main body is in sliding contact with each support plate, the draining effect on the lower surface of the belt main body is exhibited, and the desorbed water attached to the lower surface of the belt main body is more reliably compared to the conventional carrier roller. It is removed, and drainage of the belt body is promoted.

  Furthermore, valleys and peaks are alternately generated in the belt body of the endless belt on the conveyance track, and water absorption from the sludge to be concentrated to the belt body is promoted in the peaks, and in the valleys, the belt Since drainage downward from the main body is promoted, the water absorption and drainage of the endless belt are improved, and clogging of the endless belt is reduced.

A first embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, reference numeral 1 denotes a sludge on the terminal side, which is subjected to gravity filtration and dewatered and concentrated while conveying the target sludge 3 supplied from the sludge supply unit 2 (sludge supply chute, etc.) on the start side. It is a belt type concentrator which discharges from the discharge part 4 (sludge discharge chute etc.).

  This belt type concentrator 1 includes a rotatable driven roller 6 provided on the start end side, a drive roller 8 provided on the end side and driven to rotate by a motor 7, and a pair of front and rear rollers 6 and 8. And an endless belt 9 made of metal (made of stainless steel). Among these, as shown in FIG. 3, support shafts 11 provided at both ends of the drive roller 8 are rotatably supported by a pair of left and right terminal side frames 13 a via bearings 12. Similarly, support shafts 11 provided at both ends of the driven roller 6 are rotatably supported by a pair of left and right start side frames 13b via bearings 12. 2 and 3, the end side frame 13a is erected at the end (rear part) of the gantry 18 having a plurality of legs 17, and the start side frame 13b is the starting end of the gantry 18. It is erected on the part (front part).

  As shown in FIGS. 1 and 2, a roller-side sprocket 14 is provided at the tip of one support shaft 11 provided at one end of the driving roller 8, and a motor-side sprocket 15 is provided in the motor 7. The drive chain 16 is wound between the sprockets 14 and 15. Each of the support shafts 11 is provided with a sprocket 19 positioned between the end portions of the rollers 6 and 8 and the side frames 13a and 13b.

  As the track of the endless belt 9, a linear transport track 20 that transports the sludge 3 to be concentrated input from the sludge supply unit 2 to the sludge discharge unit 4, and a sludge discharge unit positioned below the transport track 20. A straight return trajectory 21 that returns from 4 to the sludge supply unit 2 is formed. Note that the supply direction S (see FIG. 1) of the sludge 3 to be concentrated from the sludge supply unit 2 to the endless belt 9 coincides with the traveling direction A of the endless belt 9 on the conveyance track 20.

  As shown in FIGS. 6 and 7, the endless belt 9 includes a belt main body 22, a chain 23 attached to both side edges of the belt main body 22 through a plurality of links 39 (an example of an attachment member), It consists of

  As shown in FIGS. 8 and 9, the belt main body 22 has a plurality of metal wires 22 a that are spirally formed around the axis in the belt width direction W and have different winding directions along the traveling direction A. Is a mesh belt formed by inserting a straight bone wire 22b through a plurality of metal wires 22a arranged in close contact with each other and overlapping in the width direction W. The belt main body 22 has a large number of minute opening portions 22c communicating with the front surface and the back surface, and a plurality of internal gaps 22d, and the opening portions 22c are adjacent to the three metal wire members 22a. It is formed between. As a result, the helical metal wires 22a are connected to each other by the bone wire 22b, the belt main body 22 is bendable in the front and back directions, has elasticity in the traveling direction A, and further in the front and back directions. It has water permeability.

  Further, on the upper surface of the belt main body 22 on the transport track 20, the metal wire 22 a is 0 in the belt width direction W with respect to the supply direction S (= traveling direction A) of the concentration target sludge 3 from the sludge supply unit 2. It is inclined at an angle α in the range of ° to 45 °.

  As shown in FIGS. 6 and 7, both the chains 23 have rigidity in the traveling direction A, and are wound between the sprocket 19 on the start end side and the sprocket 19 on the end side of the transport track 20. It is stretched with a predetermined tension.

  Each link 39 is formed in a plate shape, the outer end portion of the link 39 is integrally attached to the pin link plate 23a of the chain 23, and the inner end portion of the link 39 is the back surface of the side edge portion of the belt body 22. The screw 40, the nut 41, and the washer 42 are connected to each other. Each link 39 is provided in the traveling direction A every predetermined pitch P1.

  As shown in FIGS. 1 and 2, between the front and rear sides of the end side frame 13 a and the start side frame 13 b, the concentration target sludge 3 transported along the transport track 20 is separated from the endless belt 9 on both sides. A pair of left and right guide bodies 24 are provided to prevent spilling outward.

  The endless belt 9 is supported on the transport track 20 from below by a plurality of support plates 26a and 26b. As shown in FIGS. 3 to 5, each of the support plates 26 a and 26 b is made of a resin such as plastic, is inclined in a horizontal plane with respect to the traveling direction A, and has a central portion in the width direction W of the endless belt 9. It is arranged so as to be symmetrical with respect to the straight line L passing through. That is, in a plan view, the pair of left and right support plates 26a and 26b are arranged in a “C” shape in which the left and right intervals on the start end side are open and the left and right intervals on the end side are closed, Are arranged in multiple numbers. Note that the lower surface of the endless belt 9 is in sliding contact with the upper surfaces of the support plates 26a and 26b.

  Both end portions of the support plates 26a, 26b and an intermediate portion between the both ends are supported by a cross rail 27 from below. Each of these horizontal rails 27 is formed in an angle shape, arranged along the width direction W of the endless belt 9, and a plurality of the horizontal rails 27 are arranged at predetermined intervals from the start end portion to the end end portion of the transport track 20. Each support plate 26a, 26b is attached and fixed to the upper surface of the horizontal rail 27 by a flat head screw 28.

  Each of the horizontal bars 27 is supported between a pair of left and right horizontal frames 29. That is, the both horizontal frames 29 are attached to a pair of left and right vertical frames 30 erected on the gantry 18, and are provided from the start end to the end of the transport track 20. Both ends of each horizontal bar 27 are connected and fixed to both horizontal frames 29 by bolts 31 and nuts 32. Note that a plurality of vertical frames 30 are provided between the end side frame 13a and the start side frame 13b.

  As shown in FIGS. 1 and 5, a support roller 35 that supports the endless belt 9 from the lower side on the return track 21 is provided between a specific pair of left and right vertical frames 30. The support shafts 36 provided at both ends of the support rollers 35 are provided with sprockets 37 that mesh with the chain 23 of the endless belt 9 on the return track 21 from below.

The gantry 18 is provided with a drainage unit (not shown) that collects and discharges the desorbed water B dropped from the endless belt 9 by gravity filtering the sludge 3 to be concentrated.
Hereinafter, the operation of the above configuration will be described.

  As shown in FIG. 1, when the drive roller 8 is driven to rotate by the motor 7, the driven roller 6 is driven to rotate, and each sprocket 19 is rotated to rotate the endless belt 9 in the traveling direction A. Then, the concentration target sludge 3 to which the flocculant has been added in advance is supplied from the sludge supply unit 2 to the endless belt 9 on the conveyance track 20. The sludge 3 to be concentrated supplied to the endless belt 9 in this manner is gravity filtered while being transported from the start end side to the end side on the transport track 20 by the endless belt 9, dehydrated and concentrated, and discharged from the sludge discharge section 4. The Further, the desorbed water B desorbed from the sludge 3 to be concentrated by the gravity filtration and dropped from the endless belt 9 is collected and drained from a drainage section (not shown).

  At this time, the endless belt 9 rotates on the transport track 20 while being supported from below by the support plates 26a and 26b, and the lower surface (back surface) of the belt body 22 of the endless belt 9 is supported by the support plates 26a and 26b. Since the surfaces are in sliding contact with each other, the draining effect on the lower surface of the belt main body 22 is exhibited, the desorbed water B adhering to the lower surface of the endless belt 9 is reliably removed, and the drainage of the endless belt 9 is promoted.

  In addition, the pair of left and right support plates 26a and 26b are arranged symmetrically with respect to the straight line L, and are arranged in a "C" shape in which the left and right intervals on the start end side are open and the left and right intervals on the end side are closed. When the endless belt 9 is rotated, the straightness of the endless belt 9 on the conveyance track 20 is maintained, and the endless belt 9 is prevented from meandering. Thus, since each support plate 26a, 26b has three functions of the function which supports the endless belt 9, the draining function, and the meandering prevention function of the endless belt 9, it is rich in convenience and can reduce the number of parts. .

  Further, since the belt main body 22 has elasticity with respect to the chain 23 having rigidity in the traveling direction A, on the conveyance track 20, due to the own weight of the belt main body 22 and the own weight of the sludge 3 to be concentrated on the belt main body 22, The belt main body 22 extends in the traveling direction A with respect to the chain 23. For this reason, as shown in FIG. 10, a trough 45 bent downward is formed at a portion between the links 39 of the belt main body 22. When the endless belt 9 passes over the support plates 26a and 26b in this state, as shown in FIG. 11A, the valley portion 45 of the belt main body 22 is lifted by the support plates 26a and 26b, and a peak portion 47 is generated. Then, as shown in FIG. 11 (b), after passing over the support plates 26a, 26b, it returns to the valley 45. As a result, trough portions 45 and crest portions 47 are alternately generated in the belt main body 22 of the endless belt 9 on the conveyance track 20, and the top surface of the belt main body 22 (see FIG. 11A). Since the opening portion 22c expands on the (surface) side, water absorption from the sludge 3 to be concentrated to the internal gap 22d of the belt body 22 is promoted. Moreover, in the said trough part 45 (refer FIG.11 (b)), since the opening part 22c expands in the lower surface (back surface) side of the belt main body 22, the drainage below from the internal space | gap 22d of the belt main body 22 is accelerated | stimulated. The Thereby, the water absorption and drainage of the endless belt are improved, and clogging of the endless belt 9 is reduced.

  Further, as shown in FIG. 8, the belt main body 22 is inclined at an angle α in the belt width direction W with respect to the supply direction S (= traveling direction A) of the sludge 3 to be concentrated, as shown in FIG. The sludge 3 to be concentrated supplied is dispersed in the belt width direction W along the metal wire 22a.

  10 and 11 are exaggerated in order to clearly explain the operational effects, and the actual depth of the valley 45 and the height of the peak 47 are shown. It is slightly more than FIG. 10, FIG.

  In the first embodiment, as shown in FIG. 4, the pair of left and right support plates 26 a and 26 b are arranged in a “C” shape, but as shown below, the pair of left and right support plates 26 a and 26 b. May be arranged in other patterns.

  That is, with respect to the wide endless belt 9, as shown in FIG. 12 as the second embodiment, one of the left and right support plates 26a, 26b arranged in a “C” shape is disposed on one side. A plurality of support plates 26a parallel to the support plate 26a are arranged, and a plurality of parallel to the other left and right support plates 26b are arranged on the other side of the pair of left and right support plates 26a and 26b arranged in the above-mentioned "C" shape. A support plate 26b is disposed. The plurality of one support plate 26 a and the plurality of other support plates 26 b are arranged symmetrically with respect to the straight line L.

  Further, as shown in FIG. 13 as the third embodiment, on one side of the left and right sides with respect to the straight line L, one support plate 26a opens the left and right intervals on the start end side and closes the left and right intervals on the end side. Similarly, on the other side of the left and right sides with respect to the straight line L, the other support plate 26b has a “C” shape in which the left and right intervals on the start end side are opened and the left and right intervals on the end side are closed. The one support plate 26a and the other support plate 26b are arranged symmetrically with respect to the straight line L.

  Further, as shown in FIG. 14 as the fourth embodiment, the support plates 26 may be arranged to be inclined in the same direction with respect to the traveling direction A (straight line L) of the endless belt 9. In this case, each support plate 26 has a function of supporting the endless belt 9 and a draining function, but the meandering prevention function of the endless belt 9 is not exhibited.

  In the first embodiment, as shown in FIG. 4, the pair of left and right support plates 26 a and 26 b are inclined toward the center portion from both side portions in the width direction W of the endless belt 9, thereby starting side In the fifth embodiment, as shown in FIG. 15, the support plates 26a and 26b are connected to an endless belt. 9 is arranged in an inverted “C” shape (“V” shape) in which the left and right intervals on the start end side are closed and the left and right intervals on the end side are opened by inclining toward the both sides from the center portion in the width direction W. Also good.

  According to this, meandering of the endless belt 9 is prevented, and when the endless belt 9 passes over the support plates 26a and 26b, the valley portion 45 of the belt body 22 is lifted by the support plates 26a and 26b and the peak portion 47 is obtained. As the belt main body 22 advances, the position of the peak portion 47 changes from the center portion in the width direction W of the endless belt 9 toward both side portions. For this reason, the concentration target sludge 3 supplied onto the belt main body 22 is dispersed and leveled from the central portion of the endless belt 9 toward both sides by the peak portion 47 while being transported by the endless belt 9.

  In the first to fifth embodiments, the support plates 26, 26 a, 26 b are arranged to be inclined in the horizontal plane with respect to the traveling direction A (straight line L) of the endless belt 9. In the embodiment, as shown in FIG. 16, each support plate 26 may be arranged so as to be orthogonal to the traveling direction A (straight line L) of the endless belt 9. In this case, each support plate 26 is fixedly attached to the upper surface of each horizontal rail 27 by a countersunk screw 28.

It is a schematic side view of the belt type concentrator in the 1st Embodiment of this invention. It is a XX arrow line view in FIG. FIG. 6 is a plan view of the start side and the end side of the belt type concentrator, showing a state where the endless belt is omitted and the support plate is exposed. FIG. 3 is a plan view of an intermediate portion between the start end side and the end end side of the belt type concentrator, showing a state where a part of the endless belt is broken and a support plate is exposed. It is a XX arrow line view in FIG. It is an enlarged plan view of the side edge part of the endless belt of the belt type concentrator. It is a XX arrow line view in FIG. FIG. 3 is an enlarged plan view showing the configuration of a belt body of an endless belt of the belt type concentrator. It is a XX arrow line view in FIG. It is a side view which shows the bending of the belt main body with respect to the chain of the endless belt of the belt type concentrator. It is the side view which showed the state which the belt main body of the endless belt of a belt type concentrator progresses while being supported by a support plate, and (a) is a peak generated by the trough of the belt main body being lifted by the support plate. (B) shows the state where the troughs pass over the support plates and the troughs are formed between the support plates. It is the top view which has arrange | positioned the support plate of the belt-type concentrator in the 2nd Embodiment of this invention with a different pattern. It is the top view which has arrange | positioned the support plate of the belt-type concentrator in the 3rd Embodiment of this invention with a different pattern. It is the top view which has arrange | positioned the support plate of the belt-type concentrator in the 4th Embodiment of this invention with the different pattern. It is the top view which has arrange | positioned the support plate of the belt-type concentrator in the 5th Embodiment of this invention with a different pattern. It is the top view which has arrange | positioned the support plate of the belt-type concentrator in the 6th Embodiment of this invention with a different pattern. It is a schematic side view of the conventional belt type concentrator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Belt type concentrator 3 Sludge to be concentrated 9 Endless belt 20 Conveying track 22 Belt main body 22a, 22b Wire material 23 Chain 26, 26a, 26b Support plate 37 Sprocket 39 Link (attachment member)
A Traveling direction L Straight line P1 Predetermined pitch P2 Predetermined interval W Endless belt width direction

Claims (1)

A belt-type concentrator equipped with a rotatable and water-permeable endless belt that gravity-filters while conveying sludge to be concentrated. The endless belt is a combination of wires and has a stretchability in the direction of travel. A belt body, and a chain that is attached to both side edges of the belt body through a plurality of attachment members over the entire circumference and that has rigidity in the traveling direction, and the belt body communicates with the front surface and the back surface. The chain has a hole, and the chain is wound between rotatable sprockets arranged on the start end side and the end end side of the conveyance track, and the mounting members are provided at predetermined pitches in the advancing direction of the endless belt. A plurality of support plates that support the endless belt from the lower side on the transport track of the sludge to be concentrated are formed in the transport track direction. Are arranged at predetermined intervals, when passing through the support plate on the lower surface of the belt body is in sliding contact with the respective support plate and valleys of the belt body is lifted by the supporting plate ridges are generated in the mountain portion, A belt-type concentrator characterized in that the opening portion is enlarged on the front surface side of the belt body, and the opening portion is enlarged on the back surface side of the belt body in the valley portion .

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