Belt type concentrator

Abstract

To provide a belt type concentrator which improves detachability when detaching a concentration object from an endless belt.SOLUTION: A belt type concentrator is provided in which: a mesh-like endless belt 2 with elasticity is wound between a starting end roller rotatably arranged in a starting end side of a conveying route 4 and an end edge roller 16 rotatably arranged in an end edge side of the conveying route 4; an endless chain 25 is rotatably wound between a starting end sprocket rotatably arranged coaxially with the starting end roller and an end edge sprocket 24 rotatably arranged coaxially with the end edge roller 16; the chain 25 is attached to both side end edges of the endless belt 2 through a plurality of fitting members 33; and a peripheral length Sb of a belt inversion pathway 45 where the endless belt 2 is wound around the end edge roller 16 and inverted from top to bottom is shorter than a peripheral length Sc of a chain inversion pathway 57 where the chain 25 is wound around the end edge sprocket 24 and inverted from top to bottom.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to a belt-type concentrator that performs gravity filtration while transporting a material to be concentrated, such as sludge. [Background technology]

[0002] Conventionally, as shown in Figures 14 and 15, there is a belt-type thickener of this type that performs gravity filtration while transporting sludge 122 along a transport path 123 using a water-permeable, rotatable endless belt 121.

[0003] The endless belt 121 is a mesh-like belt made of wires, and is wound around a rotatable start-side roller 124 provided at the start end of the conveying path 123 and a rotatable end-side roller 125 provided at the end end of the conveying path 123.

[0004] A chain 126 is attached around the entire circumference of both side edges of the endless belt 121. The chain 126 is wound between a start-side sprocket (not shown) that is coaxially rotatable with the start-side roller 124, and a terminal-side sprocket 128 that is coaxially rotatable with the terminal-side roller 125. The terminal-side roller 125 is rotated together with the terminal-side sprocket 128 by a motor 129.

[0005] According to this, by driving the terminal end roller 125 to rotate with the motor 129, the start end roller 124 rotates, and the start end sprocket and the terminal end sprocket 128 rotate, and the endless belt 121 rotates in one direction integrally with the chain 126. Then, the sludge 122 is supplied from the supply unit 130 to the endless belt 121 on the conveying path 123.

[0006] The sludge 122 supplied onto the endless belt 121 in this manner is gravity filtered while being transported by the endless belt 121 along the transport path 123 from the starting end to the terminal end, and is discharged from the endless belt 121 at the terminal end in a dehydrated and concentrated state.

[0007] Thereafter, the endless belt 121 is wound around the terminal end roller 125 and rotates from top to bottom, and returns along a return path 131 from the terminal end roller 125 to the starting end roller 124 .

[0008] The above-mentioned belt-type concentrator 133 is described in, for example, Patent Document 1 below.

[0009] The belt-type concentrator 133 is also provided with a cleaning device (not shown) that sprays a cleaning liquid (not shown) onto the endless belt 121 in the return path 131.

[0010] According to this, by spraying a cleaning liquid from a cleaning device onto the endless belt 121 after the sludge has been discharged, the sludge 122 remaining within the endless belt 121 is peeled off from the endless belt 121 and removed.

[0011] Incidentally, the above-mentioned cleaning device is described in, for example, Patent Document 2 listed below. [Prior art documents] [Patent documents]

[0012] [Patent Document 1] Patent Publication No. 2005-81207 [Patent Document 2] Patent No. 3504252 Summary of the Invention [Problem to be solved by the invention]

[0013] However, in the above-mentioned conventional type, when cleaning liquid is sprayed onto the endless belt 121 after sludge has been discharged to peel off the sludge 122 remaining within the endless belt 121, the sludge 122 may be difficult to peel off sufficiently from the endless belt 121, and there is a demand for improving the peelability of the sludge 122.

[0014] An object of the present invention is to provide a belt-type concentrator in which the separation properties when separating a material to be concentrated from an endless belt are improved. [Means for solving the problem]

[0015] In order to achieve the above object, the first invention is a belt-type concentrator that conveys a concentrating object along a conveying path using a water-permeable rotatable endless belt and performs gravity filtration, The endless belt is a mesh-like belt made of an assembly of metal wires, and has elasticity in the traveling direction, a large number of minute openings communicating with the front and back surfaces, and a plurality of internal gaps, and is wound between a rotatable start-side roller provided at the start end of a conveying path and a rotatable end-side roller provided at the end end of the conveying path, An endless chain is rotatably wound between a start-side sprocket that is coaxial with the start-side roller and rotatable, and a end-side sprocket that is coaxial with the end-side roller and rotatable, The chain is attached to both side edges of the endless belt over the entire circumference via a plurality of attachment members. The circumferential length of the belt reversal path, in which the endless belt is wound around the terminal roller and reversed from top to bottom, is set shorter than the circumferential length of the chain reversal path, in which the chain is wound around the terminal sprocket and reversed from top to bottom, The perimeter of the belt reversal path is (A + T) × π / 2, where A is the outer diameter of the end-side roller and T is the thickness of the endless belt. The perimeter of the chain reversal path is B × π / 2, where B is the diameter of the chain reversal path passing through the center of the chain meshed with the end-side sprocket. The outer diameter of the end-side roller, the thickness of the endless belt, and the diameter of the chain reversal path are set to have a dimensional relationship of (A + T) < B. A cleaning device is provided that sprays a cleaning liquid onto the endless belt on the return path from the end roller to the start roller, In the belt reversal path, the endless belt shrinks in the traveling direction according to the difference in circumference between the chain reversal path and the belt reversal path, The perimeter difference between the perimeter of the chain reversal path and the perimeter of the belt reversal path is set to 100 mm or less. On the return path, the contracted endless belt stretches in the forward direction, The endless belt is stretched in advance to a length greater than the above-mentioned circumferential difference, and the chain is attached to the endless belt via an attachment member.

[0016] According to this, since the perimeter of the belt reversal path is shorter than the perimeter of the chain reversal path, in the belt reversal path, the endless belt shrinks in the traveling direction by the difference in perimeter between the perimeter of the chain reversal path and the perimeter of the belt reversal path. As a result, the object to be concentrated remaining in the endless belt is squeezed and dehydrated.

[0017] In this way, since the object to be concentrated remaining in the endless belt is dehydrated and its volume is reduced, it becomes easier for the object to be concentrated to peel off from the endless belt in the return path, and the peelability of the object to be concentrated can be improved. As a result, when the cleaning liquid is sprayed onto the endless belt in the return path from the cleaning device, the object to be concentrated remaining in the endless belt is sufficiently peeled off and removed from the endless belt.

[0019] Also, In the return path, the shrunk endless belt is stretched in the traveling direction, so that the object to be concentrated remaining in the endless belt is sufficiently peeled off and removed from the endless belt.

[0020] In the second invention The belt type thickener has the perimeter of the chain reversal path If the difference in perimeter between the perimeter of the chain reversal path and the perimeter of the belt reversal path is set as S, S = B×π / 2 - (A + T)×π / 2 The following relational expression holds.

[0021] According to this, by setting the dimensional relationship of (A + T) < B, a difference occurs between the perimeter of the chain reversal path and the perimeter of the belt reversal path, and according to this difference, the endless belt is compressed in the traveling direction in the belt reversal path.

[0022] The belt type thickener in the third invention is a belt type thickener that gravity filters while conveying an object to be concentrated along a conveying path with a rotatable endless belt having water permeability, The endless belt is a mesh-like belt made of an assembly of metal wires, and has elasticity in the traveling direction, a large number of minute openings communicating with the front and back surfaces, and a plurality of internal gaps, and is wound between a rotatable start-side roller provided at the start end of a conveying path and a rotatable end-side roller provided at the end end of the conveying path, An endless chain is rotatably wound between a start-side sprocket that is coaxial with the start-side roller and rotatable, and a end-side sprocket that is coaxial with the end-side roller and rotatable, The chain is attached to both side edges of the endless belt over the entire circumference via a plurality of attachment members. The circumferential length of the belt reversal path, in which the endless belt is wound around the terminal roller and reversed from top to bottom, is set to be longer than the circumferential length of the chain reversal path, in which the chain is wound around the terminal sprocket and reversed from top to bottom, The perimeter of the belt reversal path is (A + T) × π / 2, where A is the outer diameter of the end-side roller and T is the thickness of the endless belt. The perimeter of the chain reversal path is B × π / 2, where B is the diameter of the chain reversal path passing through the center of the chain meshed with the end-side sprocket. The outer diameter of the end-side roller, the thickness of the endless belt, and the diameter of the chain reversal path are set to have a dimensional relationship of (A + T) > B. a cleaning device for spraying a cleaning liquid onto the endless belt on the return path from the end roller to the start roller is provided between the start roller and the end roller; In the belt reversal path, the endless belt stretches in the traveling direction according to the difference in circumference between the chain reversal path and the belt reversal path, The perimeter difference between the perimeter of the chain reversal path and the perimeter of the belt reversal path is set to 20 mm or less. On the return path, the stretched endless belt contracts in the forward direction, The chain is attached to the endless belt via the attachment member in a state in which the endless belt is previously shortened to a value equal to or greater than the circumferential difference.

[0023] According to this, since the circumferential length of the belt reversing path is longer than that of the chain reversing path, in the belt reversing path, the endless belt extends in the traveling direction by the difference in circumferential length between the chain reversing path and the belt reversing path, which makes it easier for the concentrated object remaining in the endless belt to be peeled off from the endless belt, improving the peelability of the concentrated object. As a result, when the cleaning liquid is sprayed from the cleaning device onto the endless belt of the return path, the concentrated object remaining in the endless belt is sufficiently peeled off and removed from the endless belt.

[0025] Also, In the return path, the stretched endless belt is compressed in the traveling direction, so that the concentrated object peeled off from the endless belt is pushed out from the endless belt and easily removed.

[0026] In the fourth invention The belt type thickener has the perimeter of the chain reversal path If the difference in circumference between the belt and the belt reversal path is S, S = (A + T) × π / 2 - B × π / 2 The following relation holds true.

[0027] According to this, by setting the dimensional relationship (A+T)>B, a difference occurs between the circumference of the chain reversal path and the circumference of the belt reversal path, and the endless belt is stretched in the forward direction on the belt reversal path in accordance with this difference.

[0028] The belt type thickener in the fifth invention is a belt type thickener that gravity filters while transporting a concentration target along a transport path with a rotatable endless belt having water permeability. The endless belt is a mesh-shaped belt formed by combining metal wire materials, has elasticity in the traveling direction, has a large number of minute apertures communicating with the front and back surfaces, and a plurality of internal voids, and is wound between a rotatable start-side roller provided on the start side of the transport path and a rotatable end-side roller provided on the end side of the transport path. An endless chain is rotatably wound between a start-side sprocket rotatable coaxially with the start-side roller and an end-side sprocket rotatable coaxially with the end-side roller. The chain is attached to both side edges of the endless belt over the entire circumference via a plurality of attachment members. The perimeter of the belt reversal path where the endless belt is wound around the end-side roller and reverses from top to bottom is set to the same length as the perimeter of the chain reversal path where the chain is wound around the end-side sprocket and reverses from top to bottom. The perimeter of the belt reversal path is (A + T) × π / 2, where A is the outer diameter of the end-side roller and T is the thickness of the endless belt. The circumference of the chain reversal path is B x π / 2, where B is the diameter of the chain reversal path that passes through the center of the chain that is engaged with the end sprocket. The outer diameter of the end roller, the thickness of the endless belt, and the diameter of the chain reversal path are set in the dimensional relationship (A+T)=B. A belt-type concentrator comprising a cleaning device that sprays cleaning liquid onto the endless belt on the return path from the terminal roller to the starting roller. In the sixth aspect of the present invention In the belt-type concentrator, the cleaning device sprays a cleaning liquid from the inner peripheral side to the outer peripheral side of the endless belt on the return path, or from the outer peripheral side to the inner peripheral side.

[0029] This 7 The belt-type concentrator of the invention is an endless belt in which a plurality of first metal wire rods are arranged along the length of the belt, forming a spiral shape around an axis in the belt width direction, and a straight second metal wire rod is inserted through the plurality of first metal wire rods that overlap in the belt width direction. Effect of the Invention

[0030] As described above, according to the present invention, the concentrated objects can be easily peeled off from the endless belt, and the peelability of the concentrated objects can be improved. As a result, when a cleaning solution is sprayed from the cleaning device onto the endless belt on the return path, the concentrated objects remaining on the endless belt are sufficiently peeled off and removed from the endless belt. [Brief description of the drawings]

[0031] [Figure 1] 1 is a schematic side view of a belt-type concentrator according to a first embodiment of the present invention. [Diagram 2] FIG. [Diagram 3] FIG. 2 is a partially enlarged plan view of the endless belt of the belt-type concentrator of the first embodiment. [Figure 4] XX arrow view in FIG. 3. [Diagram 5] FIG. 2 is a plan view of the belt-type concentrator with the endless belt removed. [Figure 6] 2 is a view taken along the arrow XX in FIG. [Figure 7] FIG. 2 is an enlarged view of the attachment portion between the endless belt and the chain in the terminal belt reversing path and the terminal chain reversing path of the belt-type concentrator according to the first embodiment. [Figure 8] This is an enlarged view of the attachment portion between the endless belt and the chain of the belt-type concentrator as viewed from the inner side (back side) of the endless belt. [Figure 9] FIG. 2 is a side view showing the positional relationship between the endless belt and the chain in the terminal side belt reversing path and the terminal side chain reversing path of the belt-type concentrator of the first embodiment. [Figure 10]13 is an enlarged view of the attachment portions of the endless belt and the chain in the terminal side belt inversion path and the terminal side chain inversion path of a belt type concentrator in the second embodiment of the present invention. FIG. [Figure 11] FIG. 2 is a side view showing the positional relationship between the endless belt and the chain in the terminal side belt reversing path and the terminal side chain reversing path of the belt-type concentrator of the first embodiment. [Figure 12] 13 is an enlarged view of the attachment portions of the endless belt and the chain in the terminal side belt inversion path and the terminal side chain inversion path of a belt-type concentrator in the third embodiment of the present invention. FIG. [Figure 13] FIG. 2 is a side view showing the positional relationship between the endless belt and the chain in the terminal side belt reversing path and the terminal side chain reversing path of the belt-type concentrator of the first embodiment. [Figure 14] FIG. 1 is a schematic side view of a conventional belt-type concentrator. [Figure 15] 15 is a view taken along the arrow XX in FIG. 14. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0033] (First embodiment) In the first embodiment, as shown in Figures 1 and 2, reference numeral 1 denotes a belt-type concentrator that performs gravity filtration while transporting sludge 3 (an example of a substance to be concentrated) along a transport path 4 using a permeable, rotatable endless belt 2.

[0034] As shown in Figs. 3 and 4, the endless belt 2 is a mesh-like belt in which a plurality of metal wires 8 (an example of a first metal wire) are arranged in a spiral shape around an axis in the belt width direction W and in different winding directions in close contact with each other along the length direction L, and linear bone wires 9 (an example of a second metal wire) are inserted into the plurality of metal wires 8 overlapping in the belt width direction W. The endless belt 2 has a large number of minute openings 10 communicating with the front and back surfaces and a plurality of internal voids 11, and the openings 10 are formed between three adjacent metal wires 8. As a result, the spiral metal wires 8 are connected to each other by the bone wires 9, and the endless belt 2 is bendable in the front and back directions and has elasticity in the traveling direction M (length direction L).

[0035] 1, 2, 5, and 6, the endless belt 2 is wound around a start-side roller 15 provided at the start side of the conveying path 4 and a terminal-side roller 16 provided at the terminal side of the conveying path 4. The start-side roller 15 and the terminal-side roller 16 are rotatably mounted on the frame 5 of the belt-type concentrator 1 via support shafts 17 and 18, respectively.

[0036] In addition, an endless chain 25 is rotatably wound between a start-end sprocket 23 which is coaxial with the start-end roller 15 and rotatable therewith, and a terminal-end sprocket 24 which is coaxial with the terminal-end roller 16 and rotatable therewith.

[0037] The start side sprockets 23 are provided on both sides of the start side roller 15 in the direction of the rotation axis, and rotate integrally with the start side roller 15 around a common rotation axis 27. Similarly, the end side sprockets 24 are provided on both sides of the end side roller 16 in the direction of the rotation axis, and rotate integrally with the end side roller 16 around a common rotation axis 28.

[0038] The end roller 16 is forcibly rotated together with the end sprocket 24 by the motor 19 .

[0039] 2 and 6 to 8, the chain 25 has multiple outer plates 30, 31 and pins 32, etc., and is attached to both side edges of the endless belt 2 over the entire circumference via multiple mounting members 33. One outer plate 30 is located closer to the side edge of the endless belt 2, and the other outer plate 31 is located farther from the side edge of the endless belt 2. Also, while the endless belt 2 is elastic, the chain 25 barely stretches.

[0040] The mounting member 33 has a mounting piece 34 provided on one outer plate 30 of the chain 25, a pair of clamping plates 35, 36 that clamp the endless belt 2 from both the front and back sides, and a bolt 38 and a nut 39 that fasten the clamping plates 35, 36, the endless belt 2, and the mounting piece 34. The mounting members 33 are provided on the chain 25 at a predetermined pitch P.

[0041] 1, a terminal end belt reversing path 45 is formed at the terminal end of the conveying path 4 of the endless belt 2, along which the endless belt 2 is wound around the terminal end roller 16 and reversed from top to bottom. Also, a start end belt reversing path 46 is formed at the start end of the conveying path 4, along which the endless belt 2 is wound around the start end roller 15 and reversed from bottom to top. Furthermore, a return path 47 is formed between the lower end of the terminal end belt reversing path 45 and the lower end of the start end belt reversing path 46, which returns from the terminal end roller 16 to the start end roller 15.

[0042] As shown in Figures 1, 2, 5, and 9, a cleaning device 51 is provided between the start roller 15 and the end roller 16, which sprays cleaning liquid 50 from the inner side (upper side) of the endless belt 2 on the return path 47 toward the outer side (lower side).

[0043] As shown in FIG. 9, outside the terminal end belt reversing path 45, a terminal end chain reversing path 57 is formed along which the chain 25 is wound around the terminal end sprocket 24 and reverses from top to bottom.

[0044] 1 and 2, a supply section 53 (e.g., a supply chute or the like) that supplies sludge 3 onto the endless belt 2 is provided at the start end of the conveying path 4. In addition, a discharge section 54 (e.g., a discharge chute or the like) that discharges the dehydrated and concentrated sludge 3 from the endless belt 2 is provided at the end of the conveying path 4.

[0045] As shown in FIGS. 1, 2 and 5, a plurality of support plates 55 are provided on the frame 5 for supporting from below the endless belt 2 moving in the forward direction M on the conveying path 4.

[0046] As shown in Figures 7 and 9, if the outer diameter of the terminal roller 16 is A, the thickness of the endless belt 2 is T, and the diameter of the terminal chain reversal path 57 that passes through the center of the chain 25 meshed with the terminal sprocket 24 (center of the pin 32) is B, the following dimensional relationship is set. (Outer diameter A of the end roller 16 + thickness T of the endless belt 2) < diameter B of the end chain reversal path 57 If the circumference (length in the circumferential direction) of the terminal side belt reversing path 45 is Sb, the circumference of the terminal side chain reversing path 57 is Sc, and the circumference difference between the circumference Sc of the terminal side chain reversing path 57 and the circumference Sb of the terminal side belt reversing path 45 is S, the following relationship holds true. Sb = (A + T) × π / 2 Sc=B×π / 2 Sb <Sc S=Sc-Sb=B×π / 2-(A+T)×π / 2 7 and 9, for ease of understanding, the deviation C between the path along which the endless belt 2 rotates and the path along which the chain 25 rotates is shown larger than it actually is, but in reality, the deviation C is smaller than it is shown. As an example, the outer diameter A of the terminal roller 16 is set to 100 to 500 mm, the diameter B of the terminal chain reversal path 57 is set to 112 to 620 mm, the thickness T of the endless belt 2 is set to 2 to 20 mm, and the circumferential difference S is set to about 10 to 100 mm. Also, the above numerical values ​​are merely examples, and are not limited to these numerical values.

[0047] The operation of the above configuration will now be described.

[0048] By driving the terminal roller 16 to rotate by the motor 19, the terminal sprocket 24 rotates together with the terminal roller 16, and the starting roller 15 and starting sprocket 23 rotate in a driven manner, so that the endless belt 2 and the chain 25 rotate integrally.

[0049] As shown in Fig. 1, sludge 3 is supplied from a supply section 53 onto the endless belt 2 rotating on a conveying path 4, and is gravity filtered while being conveyed along the conveying path 4, and is discharged from a discharge section 54. At this time, the separated water separated from the sludge 3 is discharged downward through the openings 10 (see Fig. 3) of the endless belt 2, so that the sludge 3 is dehydrated and concentrated.

[0050] 9, since the peripheral length Sb of the terminal end belt reversing path 45 is shorter than the peripheral length Sc of the terminal end chain reversing path 57, the endless belt 2 is compressed in the traveling direction M by the peripheral length difference S in the terminal end belt reversing path 45. As a result, the sludge 3 remaining in the internal gap 11 (see FIG. 4) of the endless belt 2 is squeezed and dewatered.

[0051] In this way, the sludge 3 remaining in the internal gap 11 of the endless belt 2 is dehydrated and reduced in volume, and therefore, in the return path 47, the shrunken endless belt 2 is stretched in the traveling direction M, making it easier for the sludge 3 to peel off from the endless belt 2, improving the peelability of the sludge 3. As a result, when the cleaning liquid 50 is sprayed from the cleaning device 51 onto the endless belt 2 on the return path 47, the sludge 3 remaining in the internal gap 11 of the endless belt 2 is sufficiently peeled off and removed from the endless belt 2.

[0052] As described above, in the terminal end belt reversal path 45, the chain 25 is attached to the endless belt 2 via the mounting member 33 in a state in which the endless belt 2 is stretched in advance to a length greater than the peripheral difference S so that the endless belt 2 can be compressed by the peripheral difference S. (Second embodiment) The second embodiment will be described below. Note that the same members as those in the first embodiment described above are given the same reference numerals and detailed descriptions thereof will be omitted.

[0053] 10 and 11, the mounting member 33 has a mounting piece 34, a pair of clamping plates 35, 36, a cylindrical spacer 37, and bolts 38 and nuts 39 that fasten the clamping plates 35, 36, the endless belt 2, the spacer 37, and the mounting piece 34. The spacer 37 is provided between the clamping plate 36 on the inner circumferential side of the endless belt 2 and the mounting piece 34.

[0054] In the second embodiment, the following dimensional relationships are set: (Outer diameter A of the end roller 16 + thickness T of the endless belt 2)> diameter B of the end chain reversal path 57 In addition, the following relational expression holds: Sb = (A + T) × π / 2 Sc=B×π / 2 Sb>Sc S = Sb - Sc = (A + T) x π / 2 - B x π / 2 In Fig. 10 and Fig. 11, for ease of explanation, the deviation C between the path along which the endless belt 2 rotates and the path along which the chain 25 rotates is shown larger than it actually is, but in reality, the deviation C is smaller than it is shown. As an example, the outer diameter A of the terminal roller 16 is set to 100 to 500 mm, the diameter B of the terminal chain reversal path 57 is set to 80 to 530 mm, the thickness T of the endless belt 2 is set to 2 to 20 mm, and the peripheral difference S is set to about 10 to 20 mm. Also, the above numerical values ​​are merely examples, and the present invention is not limited to these numerical values.

[0055] The operation of the above configuration will now be described.

[0056] Since the circumferential length Sb of the terminal end belt reversing path 45 is longer than the circumferential length Sc of the terminal end chain reversing path 57, the endless belt 2 is stretched in the traveling direction M by the circumferential length difference S in the terminal end belt reversing path 45. This makes it easier for the sludge 3 remaining in the internal gap 11 (see FIG. 4) of the endless belt 2 to be peeled off from the endless belt 2, improving the peelability of the sludge 3. Furthermore, when the cleaning liquid 50 is sprayed from the cleaning device 51 onto the endless belt 2 in the return path 47, the stretched endless belt 2 shrinks in the traveling direction M in the return path 47, so that the sludge 3 peeled off from the endless belt 2 is pushed out from the internal gap 11 of the endless belt 2 and easily removed.

[0057] As described above, in the terminal side belt reversal path 45, the chain 25 is attached to the endless belt 2 via the attachment member 33 in a state in which the endless belt 2 has been previously shortened to a length equal to or greater than the peripheral difference S so that the endless belt 2 can be stretched by the peripheral difference S. (Third embodiment) The third embodiment will be described below. Note that the same members as those in the first embodiment described above are given the same reference numerals and detailed descriptions thereof will be omitted.

[0058] In the third embodiment, as shown in Figs. 12 and 13, the following dimensional relationships are set. (Outer diameter A of the end roller 16 + thickness T of the endless belt 2) = diameter B of the end chain reversal path 57 In addition, the following relational expression holds: Sb = (A + T) × π / 2 Sc=B×π / 2 Sb=Sc S = Sb - Sc = (A + T) x π / 2 - B x π / 2 = 0 The operation of the above configuration will now be described.

[0059] Since the peripheral length Sb of the terminal side belt reversing path 45 and the peripheral length Sc of the terminal side chain reversing path 57 are set to the same length, in the terminal side belt reversing path 45, the outer peripheral side 2a of the endless belt 2 is stretched and the inner peripheral side 2b is compressed.

[0060] As a result, the sludge 3 remaining in the internal gap 11 (see FIG. 4) of the endless belt 2 is pushed out from the inner peripheral side 2b to the outer peripheral side 2a of the endless belt 2, and becomes easily peeled off from the endless belt 2 at the outer peripheral side 2a. As a result, when cleaning liquid 50 is sprayed from the cleaning device 51 onto the inner side 2b of the endless belt 2 on the return path 47, the sludge 3 remaining in the internal gap 11 of the endless belt 2 is sufficiently peeled off from the endless belt 2 and easily removed from the outer side 2a of the endless belt 2.

[0061] In the above-described embodiments, the sludge 3 is given as an example of the object to be concentrated, but the object is not limited to the sludge 3.

[0062] In each of the above-described embodiments, as shown in Figures 1, 9, 11 and 13, the cleaning device 51 sprays cleaning liquid 50 from the inner side (upper side) of the endless belt 2 on the return path 47 toward the outer side (lower side), but the cleaning liquid 50 may also be sprayed from the outer side (lower side) of the endless belt 2 toward the inner side (upper side).

[0063] In each of the above embodiments, as shown in FIG. 5 , a starting sprocket 23 is provided on the outside of both ends of the starting roller 15, and a terminal sprocket 24 is provided on the outside of both ends of the terminal roller 16. However, starting sprockets 23 may be provided on both ends of the starting roller 15, and terminal sprockets 24 may be provided on both ends of the terminal roller 16. [Explanation of symbols]

[0064] 1. Belt type concentrator 2 Endless belt 3 Sludge (subject to be concentrated) 4. Transport Route 8 Metal wire (first metal wire) 9 Bone wire (second metal wire) 15 Starting roller 16 End roller 23 Starting sprocket 24 End sprocket 25 Chen 33 Mounting material 45 End belt reversal path 47 Return Route 50 Cleaning Solution 51 Cleaning Equipment 57 End side chain reversal route A Outer diameter of end roller B Diameter of end chain reversal path M Direction of travel S circumference difference Sb Circumference of belt reversal path on end side Sc Circumference of the chain reversal path on the end side T endless belt thickness W Belt width direction

Claims

1. A belt-type concentrator that performs gravity filtration while conveying a concentrating object along a conveying path using a water-permeable rotatable endless belt, The endless belt is a mesh-like belt made of an assembly of metal wires, and has elasticity in the traveling direction, a large number of minute openings communicating with the front and back surfaces, and a plurality of internal gaps, and is wound between a rotatable start-side roller provided at the start end of a conveying path and a rotatable end-side roller provided at the end end of the conveying path, An endless chain is rotatably wound between a start-side sprocket that is coaxial with the start-side roller and rotatable, and a end-side sprocket that is coaxial with the end-side roller and rotatable, The chain is attached to both side edges of the endless belt over the entire circumference via a plurality of attachment members. The circumferential length of the belt reversal path, in which the endless belt is wound around the terminal roller and reversed from top to bottom, is set shorter than the circumferential length of the chain reversal path, in which the chain is wound around the terminal sprocket and reversed from top to bottom, The circumferential length of the belt reversal path is (A+T)×π / 2, where A is the outer diameter of the terminal roller and T is the thickness of the endless belt. The circumference of the chain reversing path is B x π / 2, where B is the diameter of the chain reversing path that passes through the center of the chain meshing with the end sprocket. The outer diameter of the end roller, the thickness of the endless belt, and the diameter of the chain reversal path are set to have a dimensional relationship of (A + T) < B. A cleaning device is provided that sprays a cleaning liquid onto the endless belt on the return path from the end roller to the start roller, In the belt reversal path, the endless belt shrinks in the traveling direction according to the difference in circumference between the chain reversal path and the belt reversal path, The difference in circumference between the chain reversal path and the belt reversal path is set to 100 mm or less. On the return path, the contracted endless belt stretches in the forward direction, A belt-type concentrator characterized in that the chain is attached to the endless belt via an attachment member in a state in which the endless belt is stretched in advance to a length greater than the above-mentioned peripheral difference.

2. If the difference in circumference between the chain reversal path and the belt reversal path is S, S=B×π / 2-(A+T)×π / 2 2. The belt-type concentrator according to claim 1, wherein the following relationship holds:

3. A belt-type concentrator that performs gravity filtration while conveying a concentrating object along a conveying path using a water-permeable rotatable endless belt, The endless belt is a mesh-like belt made of an assembly of metal wires, and has elasticity in the traveling direction, a large number of minute openings communicating with the front and back surfaces, and a plurality of internal gaps, and is wound between a rotatable start-side roller provided at the start end of a conveying path and a rotatable end-side roller provided at the end end of the conveying path, An endless chain is rotatably wound between a start-side sprocket that is coaxial with the start-side roller and rotatable, and a end-side sprocket that is coaxial with the end-side roller and rotatable, The chain is attached to both side edges of the endless belt over the entire circumference via a plurality of attachment members. The circumferential length of the belt reversal path, in which the endless belt is wound around the terminal roller and reversed from top to bottom, is set to be longer than the circumferential length of the chain reversal path, in which the chain is wound around the terminal sprocket and reversed from top to bottom, The circumferential length of the belt reversal path is (A+T)×π / 2, where A is the outer diameter of the terminal roller and T is the thickness of the endless belt. The circumference of the chain reversing path is B x π / 2, where B is the diameter of the chain reversing path that passes through the center of the chain meshing with the end sprocket. The outer diameter of the end roller, the thickness of the endless belt, and the diameter of the chain reversal path are set in a dimensional relationship of (A+T)>B. a cleaning device for spraying a cleaning liquid onto the endless belt on the return path from the end roller to the start roller is provided between the start roller and the end roller; In the belt reversal path, the endless belt stretches in the traveling direction according to the difference in circumference between the chain reversal path and the belt reversal path, The difference in circumference between the chain reversal path and the belt reversal path is set to 20 mm or less. On the return path, the stretched endless belt contracts in the forward direction, A belt-type concentrator characterized in that the chain is attached to the endless belt via an attachment member in a state in which the endless belt is previously shortened to a value equal to or greater than the circumferential difference.

4. If the difference in circumference between the chain reversal path and the belt reversal path is S, S=(A+T)×π / 2−B×π / 2 4. The belt type concentrator according to claim 3, wherein the following relationship holds:

5. A belt-type concentrator that performs gravity filtration while conveying a concentrating object along a conveying path using a water-permeable, rotatable endless belt, The endless belt is a mesh-like belt made of an assembly of metal wires, and has elasticity in the traveling direction, a large number of minute openings communicating with the front and back surfaces, and a plurality of internal gaps, and is wound between a rotatable start-side roller provided at the start end of a conveying path and a rotatable end-side roller provided at the end end of the conveying path, An endless chain is rotatably wound between a start-side sprocket that is coaxial with the start-side roller and rotatable, and a end-side sprocket that is coaxial with the end-side roller and rotatable, The chain is attached to both side edges of the endless belt over the entire circumference via a plurality of attachment members. The circumferential length of the belt reversal path, where the endless belt is wound around the terminal roller and reversed from top to bottom, is set to the same length as the circumferential length of the chain reversal path, where the chain is wound around the terminal sprocket and reversed from top to bottom, The circumferential length of the belt reversal path is (A+T)×π / 2, where A is the outer diameter of the terminal roller and T is the thickness of the endless belt. The circumference of the chain reversing path is B x π / 2, where B is the diameter of the chain reversing path that passes through the center of the chain meshing with the end sprocket. The outer diameter of the end roller, the thickness of the endless belt, and the diameter of the chain reversal path are set in a dimensional relationship of (A + T) = B. A belt-type concentrator comprising a cleaning device that sprays cleaning liquid onto the endless belt on the return path from the terminal roller to the starting roller.

6. A belt-type concentrator described in any one of claims 1 to 5, characterized in that the cleaning device sprays cleaning liquid from the inner side to the outer side of the endless belt of the return path, or from the outer side to the inner side.

7. A belt-type concentrator as described in any one of claims 1 to 6, characterized in that the endless belt is constructed by arranging a plurality of first metal wires spirally around an axis in the belt width direction along the belt length direction, and inserting a straight second metal wire through the plurality of first metal wires overlapping in the belt width direction.

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