Gypsum recovery equipment

Abstract

To enable dewatering performance to be improved.SOLUTION: A gypsum recovery device for dewatering a gypsum slurry and recovering a gypsum comprises a conveyance device conveying a gypsum slurry while the gypsum slurry is mounted on a filter cloth, and at least one notch formation device capable of forming a notch on the surface of the gypsum slurry conveyed by the conveyance device, wherein when a direction crossing a gypsum slurry conveyance direction is denoted as a cross direction, at least the one notch formation device includes a shaft extending in the cross direction on the filter cloth, a bearing portion rotatably supporting the shaft, at least one suspended portion which is configured to be rotated accordingly to rotation of the shaft and whose one end is fixed to the shaft and the other end can be brought into contact with the surface of the gypsum slurry, and a torque adjustment portion which is configured to adjust a rotation start torque for starting the rotation of the shaft.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a gypsum recovery device that dewaters a gypsum slurry to recover gypsum. [Background technology]

[0002] Conventionally, gypsum recovery devices that recover gypsum by dehydrating a gypsum slurry while transporting the gypsum slurry have been known. For example, Patent Document 1 discloses a gypsum recovery device that includes a stirring rod that breaks a thin film layer formed on the surface of the gypsum slurry during transport (by forming notches on the surface of the gypsum slurry) in order to improve dehydration performance. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-249111 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, the thickness of the gypsum slurry being transported may be uneven, and the hardness may vary depending on the components and moisture content. However, the technology described in Patent Document 1 is not configured to destroy the surface film of the gypsum slurry depending on the state of the gypsum slurry being transported, and there is a risk that the destruction of the surface film may inhibit improvement in dewatering performance.

[0005] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a gypsum recovery device that can improve dewatering performance. [Means for solving the problem]

[0006] In order to achieve the above object, a gypsum recovery device according to the present disclosure is a gypsum recovery device for recovering gypsum by dehydrating a gypsum slurry, and includes: a conveying device that conveys the gypsum slurry while it is placed on a filter cloth; and at least one notch forming device that can form a notch in a surface of the gypsum slurry being conveyed by the conveying device, wherein the at least one notch forming device includes: a shaft that extends on the filter cloth along a direction that intersects with a conveying direction of the gypsum slurry, the direction being defined as an intersecting direction; a bearing unit that rotatably supports the shaft; at least one hanging part that is configured to rotate in accordance with rotation of the shaft, the at least one hanging part having one end fixed to the shaft and the other end configured to be able to contact the surface of the gypsum slurry; and a torque adjustment unit that is configured to adjust a rotation start torque at which rotation of the shaft starts. [Effects of the Invention]

[0007] According to the gypsum recovery device of the present disclosure, dewatering performance can be improved. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a diagram illustrating a schematic configuration of a gypsum recovery device according to an embodiment. [Figure 2] FIG. 1 is a diagram illustrating a schematic configuration of a notch forming device according to an embodiment. [Figure 3] FIG. 2 is a diagram illustrating a schematic configuration of one side support base according to an embodiment. [Figure 4] FIG. 10 is a perspective view illustrating the shape of a hanging part according to one embodiment. [Figure 5] FIG. 2 is a diagram illustrating a schematic configuration of a torque adjustment unit according to one embodiment. [Figure 6] 6 is a diagram for explaining the configuration of the other end of the arm portion in FIG. 5 and its surroundings. FIG. [Figure 7] 10A and 10B are diagrams for explaining a limit position of the other end of the hanging part according to one embodiment. [Figure 8]FIG. 10 is a diagram illustrating a schematic configuration of a modified example of a notch forming device according to an embodiment. [Figure 9] FIG. 10 is a diagram schematically illustrating a configuration of a gypsum recovery device according to another embodiment. [Figure 10] 10 is a diagram showing the layout of a hanging portion of a first notch forming device and a hanging portion of a second notch forming device according to another embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a gypsum recovery device according to an embodiment of the present disclosure will be described with reference to the drawings. The embodiment shows one aspect of the present disclosure, but does not limit the present disclosure and can be arbitrarily modified within the scope of the technical concept of the present disclosure.

[0010] (Configuration of gypsum recovery device) 1 is a diagram schematically illustrating a configuration of a gypsum recovery apparatus 1 according to one embodiment. The gypsum recovery apparatus 1 according to the present disclosure is an apparatus for dehydrating a gypsum slurry X1 to recover gypsum X2. The gypsum recovery apparatus 1 dehydrates the gypsum slurry X1, which is a by-product of a wet flue gas desulfurization apparatus for desulfurizing exhaust gas discharged from a combustion facility such as a boiler, and recovers the gypsum X2.

[0011] As shown in FIG. 1, the gypsum recovery device 1 includes a transport device 2 and a notch forming device 4.

[0012] The conveying device 2 conveys the gypsum slurry X1 placed on the filter cloth 6. In the embodiment illustrated in FIG. 1 , the conveying device 2 includes a conveying belt 50, two rotatably supported drums 52, a motor 54 connected to one of the two drums 52, a first-side drum 52A (52), and configured to drive the first-side drum 52A to rotate, and a plurality of guide rollers 56. The conveying belt 50 is made of an endless band-like rubber member (elastic body) and is stretched around the two drums 52 that are spaced apart from each other along the horizontal direction. Because the conveying belt 50 is stretched across the two drums 52, when the first-side drum 52A is driven to rotate by the motor 54, the second-side drum 52B (52) rotates and the conveying belt 50 moves around.

[0013] The filter cloth 6 is provided in an endless belt shape, is stretched around a plurality of guide rollers 56 so as to be freely movable, and a portion of its length is overlapped on the upper surface of the conveyor belt 50. Therefore, when the conveyor belt 50 moves around, the filter cloth 6 also moves around. The filter cloth 6 is not particularly limited as long as it is breathable, and includes, for example, a woven fabric formed by weaving a fibrous resin material (such as polyester or polypropylene). In some embodiments, the filter cloth 6 includes a nonwoven fabric formed by intertwining a fibrous resin material (such as polyester or polypropylene).

[0014] 1, the gypsum recovery device 1 is configured so that a gypsum slurry X1 is supplied onto a part of a filter cloth 6 that is superimposed on the upper surface of a conveyor belt 50. The gypsum recovery device 1 is configured so that the gypsum slurry X1 is dehydrated when the gypsum slurry X1 is conveyed together with the filter cloth 6 by the conveyor belt 50. Here, an example of the configuration of the gypsum recovery device 1 for dehydrating the gypsum slurry X1 will be described.

[0015] As illustrated in FIG. 1 , the gypsum recovery device 1 includes a dehydration chamber 58 that is provided below the conveyor belt 50 on the opposite side of the conveyor belt 50 from the filter cloth 6, and that maintains a negative pressure (a pressure lower than atmospheric pressure) inside the dehydration chamber 58; a vacuum pump 60; a reduced pressure line 62 that is connected at one end to the dehydration chamber 58 and at the other end to the vacuum pump 60; and a vacuum tank 64 that is provided in the reduced pressure line 62.

[0016] By driving the vacuum pump 60, the pressure in the dehydration chamber 58 is reduced to a negative pressure, and the moisture in the gypsum slurry X1 placed on the filter cloth 6 is forcibly sucked from below, thereby dehydrating the gypsum slurry X1. The moisture dehydrated from the gypsum slurry X1 is sent from the dehydration chamber 58 to a vacuum tank 64 as filtrate X3 by driving the vacuum pump 60. A drain port 65 is formed in the bottom of the vacuum tank 64 so that the filtrate X3 in the vacuum tank 64 can be discharged. Gypsum X2 obtained by dehydrating the gypsum slurry X1 is removed from the filter cloth 6 downstream of the dehydration chamber 58 in the conveying direction D1 of the gypsum slurry X1. Although not shown, the conveyor belt 50 has a plurality of holes formed therein to allow the moisture in the gypsum slurry X1 to pass through.

[0017] Next, the notch forming device 4 will be described. The notch forming device 4 forms notches on the surface of the gypsum slurry X1 being transported by the transport device 2. The gypsum slurry X1, which is placed on the filter cloth 6 and transported, is dehydrated as it is transported by the transport device 2, becoming a gypsum cake, and a surface film (fine particle layer) is formed on the surface. This surface film of the gypsum slurry X1 may hinder the dehydration of the gypsum slurry X1. In particular, when the gypsum recovery device 1 has the configuration as illustrated in FIG. 1 (the dehydration chamber 58, the vacuum pump 60, the reduced pressure line 62, and the vacuum tank 64), it becomes difficult to suck out the moisture in the gypsum slurry X1. Therefore, to improve dehydration performance, the notch forming device 4 is disposed on a part of the filter cloth 6 that is layered on the upper surface of the transport belt 50. The notch forming device 4 forms notches in the surface of the gypsum slurry X1 being transported, thereby destroying the surface film of the gypsum slurry X1.

[0018] The configuration of the notch forming device 4 will be described in detail. Fig. 2 is a diagram schematically showing the configuration of the notch forming device 4 according to one embodiment. As illustrated in Fig. 2, the notch forming device 4 includes a shaft 8, a bearing unit 10, a hanging part 12, and a torque adjustment unit 14.

[0019] If a direction intersecting a conveying direction D1 of the gypsum slurry X1 (a direction from the back side of the paper surface of FIG. 2 toward the front side of the paper surface; hereinafter, referred to as conveying direction D1) is defined as a cross direction D2, the shaft 8 extends along the cross direction D2 on the filter cloth 6. In the embodiment illustrated in FIG. 2, the shaft 8 has a longitudinal direction along the cross direction D2, and includes a main body portion 9 to which a hanging portion 12 described later is attached, one end portion 11 extending from one end 9a of the main body portion 9 on one side of the cross direction D2 to one side of the cross direction D2, and the other end portion 13 extending from the other end 9b of the main body portion 9 on the other side of the cross direction D2 to the other side of the cross direction D2.

[0020] Main body 9 of shaft 8 has, for example, a rectangular shape when viewed in intersecting direction D2, and is configured to facilitate attachment of hanging part 12. In some embodiments, main body 9 has a quadrangular prism shape.

[0021] Each of the one end 11 and the other end 13 of the shaft 8 has, for example, a circular shape when viewed in the intersecting direction D2, and the axis O of the shaft 8 passes through the center of each of the one end 11 and the other end 13 of the shaft 8. In other words, each of the one end 11 and the other end 13 of the shaft 8 has a cylindrical shape.

[0022] The bearing portion 10 rotatably supports the shaft 8. In the embodiment illustrated in FIG. 2 , the bearing portion 10 includes a first-side bearing portion 10A(10) that supports one end 11 of the shaft 8 and a second-side bearing portion 10B(10) that supports the other end 13 of the shaft 8. The first-side bearing portion 10A is disposed on the opposite side of the conveyor belt 50 from the second-side bearing portion 10B. The first-side bearing portion 10A is penetrated by the one end 11 of the shaft 8. The second-side bearing portion 10B is penetrated by the other end 13 of the shaft 8. In one embodiment, the first-side bearing portion 10A and the second-side bearing portion 10B are rolling bearings that rotatably support the one end 11 and the other end 13 of the shaft 8, respectively, with low friction. Note that the present disclosure does not limit the bearing portion 10 to a rolling bearing.

[0023] 2, the notch forming device 4 further includes a support base 16 that supports the bearing portion 10. The support base 16 is fixed to, for example, a floor surface 51 of a building in which the gypsum recovery device 1 is installed. The support base 16 includes a first support base 16A that supports the first bearing portion 10A and a second support base 16B that supports the second bearing portion 10B.

[0024] An example of the configuration of the one-side support base 16A will be described. Fig. 3 is a diagram schematically illustrating the configuration of the one-side support base 16A according to one embodiment, and is a top view of the one-side support base 16A viewed from above. The other-side support base 16B may have the same configuration as the one-side support base 16A, or may have a different configuration from the one-side support base 16A as long as it supports the other-side bearing portion 10B. In the present disclosure, the other-side support base 16B has the same configuration as the one-side support base 16A, and therefore description of the other-side support base 16B will be omitted.

[0025] In the embodiment illustrated in FIG. 3, the one-side support base 16A includes an upstream plate portion 18, a downstream plate portion 20, and a front plate portion 22.

[0026] The upstream plate portion 18 has a plate shape with its longitudinal direction along the up-down direction D3, and is located upstream in the conveying direction D1 from one end portion 11 of the shaft 8. The downstream plate portion 20 has a plate shape with its longitudinal direction along the up-down direction D3, and is located downstream in the conveying direction D1 from one end portion 11 of the shaft 8. The upstream plate portion 18 and the downstream plate portion 20 face each other.

[0027] The front plate portion 22 has a plate shape with its longitudinal direction along the up-down direction D3, is located on the other side of the one-side bearing portion 10A in the transverse direction D2, and is penetrated by one end 11 of the shaft 8. The front plate portion 22 connects the other end of the upstream plate portion 18 in the transverse direction D2 to the other end of the downstream plate portion 20 in the transverse direction D2. In other words, on one side of the front plate portion 22 in the transverse direction D2, a space 21 is defined by being surrounded by the upstream plate portion 18, the downstream plate portion 20, and the front plate portion 22.

[0028] The one-side bearing portion 10A is located within the space 21 of the one-side support base 16A. The tip of one side of the one end 11 of the shaft 8 in the transverse direction D2 is also located within the space 21 of the one-side support base 16A. In other words, the one end 11 of the shaft 8 does not extend beyond the space 21 of the one-side support base 16A to the one side in the transverse direction D2. The one-side bearing portion 10A and the front plate portion 22 are fastened together by a bolt 24 serving as a fastening member.

[0029] Returning to FIG. 2 , hanging portion 12 and torque adjustment portion 14 will be described. Hanging portion 12 is configured to rotate as shaft 8 rotates, with one end 26 fixed to main body 9 of shaft 8 and the other end 28 configured to be able to contact the surface of gypsum slurry X1. In other words, hanging portion 12 extends radially outward from main body 9 of shaft 8 about axis O of shaft 8. When hanging portion 12 extends downward from main body 9 of shaft 8 parallel to the direction of gravity (when angle θ, described later, is 0 degrees), tip 29 of hanging portion 12 is located below and beyond filter cloth 6 or comes into contact with filter cloth 6.

[0030] In the embodiment illustrated in FIG. 2, a plurality of hanging portions 12 are fixed to main body 9 of shaft 8. The plurality of hanging portions 12 are arranged side by side along intersecting direction D2. The method for fixing hanging portions 12 is not particularly limited, and hanging portions 12 are fixed to main body 9 of shaft 8 by welding, for example. Note that notch forming device 4 may include any number of hanging portions 12 and is not limited to the embodiment illustrated in FIG. 2. For example, notch forming device 4 may include one hanging portion 12.

[0031] An example of the shape of hanging portion 12 will be described. FIG. 4 is a perspective view illustrating the shape of hanging portion 12 according to one embodiment. In the embodiment illustrated in FIG. 4, hanging portion 12 includes plate portion 30 having a plate shape. Plate portion 30 constitutes the entire hanging portion 12. One end portion 26 of hanging portion 12 is fixed to main body portion 9 of shaft 8 so that thickness direction D4 of plate portion 30 coincides with transverse direction D2. In other words, hanging portion 12 includes first maximum outer surface 31a and second maximum outer surface 31b, which are the largest of the outer surfaces of hanging portion 12, with first maximum outer surface 31a facing one side of transverse direction D2 and second maximum outer surface 31b facing the other side of transverse direction D2.

[0032] Next, a description will be given of the torque adjustment unit 14. The torque adjustment unit 14 is configured to be able to adjust the rotation start torque at which the shaft 8 starts to rotate.

[0033] In the embodiment illustrated in FIG. 2 , the notch forming device 4 further includes a flange portion 34 attached to one end 11 of the shaft 8 and having a flange surface 32 extending radially outward from the axis O of the shaft 8. The flange portion 34 is located on the other side of the one-side support base 16A in the transverse direction D2. The flange surface 32 faces one side of the transverse direction D2. The torque adjustment unit 14 is attached to this flange surface 32 so as to be located radially outward from the axis O of the shaft 8. In other words, the weight of the torque adjustment unit 14 is transmitted to the shaft 8 via the flange portion 34, and the rotation start torque of the shaft 8 is adjusted in accordance with the weight of the torque adjustment unit 14.

[0034] An example of the configuration of the torque adjustment unit 14 will now be described. Fig. 5 is a diagram schematically illustrating the configuration of the torque adjustment unit 14 according to one embodiment, as viewed from one side in the transverse direction D2. In the embodiment illustrated in Fig. 5, the flange portion 34 has a square shape when viewed in the transverse direction D2. A bolt hole 36 recessed toward the other side in the transverse direction D2 is formed in the flange surface 32.

[0035] The torque adjustment unit 14 includes an arm portion 38 having one end 40 fixed to one end 11 of the shaft 8 and extending downstream in the conveying direction D1 from the one end 40 to the other end 42. In the embodiment illustrated in Fig. 5, a through hole 47 is formed in the one end 40 of the arm portion 38. The arm portion 38 and the flange portion 34 are fastened together by inserting a bolt 39 as a fastening member into the through hole 47 of the arm portion 38 and the bolt hole 36 of the flange portion 34 while they are aligned.

[0036] The other end 42 of the arm portion 38 is configured to allow attachment of a weight 44. More specifically, as illustrated in Fig. 6, the torque adjustment unit 14 further includes a rod-shaped support rod 46, and the other end 42 of the arm portion 38 is formed with an adjustment hole 48 into which the support rod 46 is inserted. The weight 44 is ring-shaped, and is formed with an insertion hole 49 into which the support rod 46 is inserted. With a portion of the support rod 46 inserted into the other end 42 of the arm portion 38, the torque adjustment unit 14 increases the rotation start torque of the shaft 8 by inserting the weight 44 into the remainder of the support rod 46.

[0037] The other end 42 of the arm portion 38 is configured so that the attachment position of the weight 44 can be adjusted along the direction in which the arm portion 38 extends. In the embodiment illustrated in Fig. 5, the other end 42 of the arm portion 38 has a plurality of adjustment holes 48 formed therein. The plurality of adjustment holes 48 are formed side by side in the radial direction centered on the axis O of the shaft 8. Of the plurality of adjustment holes 48, an outer adjustment hole 48a (48) located on the outermost radial side is located on the most downstream side in the conveying direction D1.

[0038] In the embodiment illustrated in FIG. 5 , torque adjustment unit 14 further includes stopper portion 41 provided below arm portion 38 and configured to stop downward movement of arm portion 38. Stopper portion 41 prevents rotation of shaft 8 so that tip 29 of hanging portion 12 does not approach filter cloth 6 beyond a predetermined limit position. The limit position of tip 29 of hanging portion 12, for example, as illustrated in FIG. 7 , satisfies the following relationship: 25 degrees≦angle θ≦35 degrees, where L1 is an imaginary line extending in the direction of gravity (vertical direction D3), L2 is an imaginary line extending in the extension direction of hanging portion 12, and θ is the angle formed by L1 and L2. If angle θ exceeds 35 degrees, hanging portion 12 will be more likely to rotate away from filter cloth 6 (will be more likely to bounce up). Therefore, by setting angle θ to 35 degrees or less, the bounce up of hanging portion 12 is suppressed. On the other hand, if angle θ is less than 25 degrees, tip 29 of hanging portion 12 may come into contact with filter cloth 6, possibly tearing filter cloth 6. Therefore, by setting angle θ to 25 degrees or greater, tearing of filter cloth 6 is prevented. In some embodiments, the limit position of tip 29 of hanging portion 12 satisfies 29 degrees≦angle θ≦31 degrees. In some embodiments, when the limit position of tip 29 of hanging portion 12 satisfies 25 degrees≦angle θ≦35 degrees, the distance between tip 29 of hanging portion 12 and filter cloth 6 in the up-down direction D3 is 10 mm or more and 20 mm or less.

[0039] Furthermore, the stopper portion 41 is configured so that its position in the vertical direction D3 can be adjusted along the direction of gravity. The stopper portion 41 is, for example, an adjuster bolt, and the position of the arm portion 38 in the vertical direction D3 is adjusted by rotating the adjuster bolt. The angle θ increases by the amount the arm portion 38 is raised, and decreases by the amount the arm portion 38 is lowered. In the embodiment illustrated in FIG. 5, the stopper portion 41 (adjuster bolt) penetrates a plate member 43. The plate member 43 is fixed to, for example, one support base 16A.

[0040] (Actions and effects of the gypsum recovery device) The following describes the operation and effect of the gypsum recovery device 1 according to one embodiment. The gypsum slurry X1 being transported by the transport device 2 may be deposited on the filter cloth 6 in uneven thickness, or may have varying hardness due to differences in the components and moisture content.

[0041] According to one embodiment, the notch forming device 4 includes a torque adjusting unit 14 that can adjust the rotation start torque of the shaft 8. Therefore, the depth of the notch formed in the surface of the gypsum slurry X1 can be set depending on the state of the gypsum slurry X1 during transportation. That is, the depth of the notch can be maintained at a depth that promotes dehydration of the gypsum slurry X1 (for example, a notch depth that makes the thickness of the gypsum slurry X1 10 mm). Therefore, it is possible to provide a gypsum recovery device 1 that can improve dehydration performance.

[0042] If unintentional foreign matter is mixed into the gypsum slurry X1 being conveyed, the notch forming device 4 may be damaged. For example, if the foreign matter has a harder hardness than the gypsum slurry X1, there is a risk that the hanging portion 12 (comb blade) may bend when the hanging portion 12 comes into contact with the foreign matter. According to one embodiment, when the hanging portion 12 comes into contact with the foreign matter, if the torque exceeds the rotation start torque of the shaft 8 adjusted by the torque adjustment unit 14, the hanging portion 12 rotates about the axis O of the shaft 8 so as to move away from the filter cloth 6. In other words, by causing the hanging portion 12 to bounce up, bending of the hanging portion 12 can be prevented. In this way, according to one embodiment, damage to the notch forming device 4 can be suppressed.

[0043] According to one embodiment, as illustrated and described in FIG. 4, hanging portion 12 includes plate portion 30 having a plate shape, and therefore the second moment of area against bending is strengthened compared to when hanging portion 12 has a rod shape, and therefore bending of hanging portion 12 due to contact with the surface of gypsum slurry X1 during transport can be suppressed.

[0044] According to one embodiment, as illustrated in Figures 5 and 6, the torque adjustment unit 14 can adjust the rotation start torque with a simple configuration in which a weight 44 is attached to the other end 42 of the arm portion 38.

[0045] 5, multiple adjustment holes 48 into which support rods 46 are inserted are formed in the other end 42 of the arm portion 38. Therefore, by changing the adjustment holes 48 into which the support rods 46 are inserted, the rotation start torque can be adjusted without changing the mass of the weight 44.

[0046] 5, the torque adjustment unit 14 includes a stopper portion 41 that stops the downward movement of the arm portion 38, and therefore can prevent the rotation of the shaft 8 via the arm portion 38 and the flange portion 34. This can prevent the notch formed in the surface of the gypsum slurry X1 from becoming too deep.

[0047] According to one embodiment, as illustrated in FIG. 5, stopper portion 41 is configured so that its position in the vertical direction D3 can be adjusted along the direction of gravity. Therefore, by adjusting the vertical position of stopper portion 41, the position of tip 29 of hanging portion 12 can be fine-tuned via arm portion 38.

[0048] Fig. 8 is a diagram schematically illustrating the configuration of a modified example of notch forming device 4 according to one embodiment, illustrating a portion of the configuration of notch forming device 4. As illustrated in Fig. 8, notch forming device 4 further includes flange portion 34, one-side support base 16A, and lock pin 45 that can be simultaneously inserted into both first hole 35 formed in flange surface 32 and second hole 17 formed in one-side support base 16A when hanging portion 12 is flipped up. Note that a description of flange portion 34 and one-side support base 16A has been given above, so will not be provided here.

[0049] According to this configuration, during maintenance such as replacing filter cloth 6, by simultaneously inserting lock pin 45 into both first hole 35 and second hole 17, hanging portion 12 can be easily fixed at a position away from filter cloth 6. This makes maintenance easy to perform.

[0050] In some embodiments, the torque adjustment unit 14 further includes a fall-off prevention member (e.g., a nut) attached to the support rod 46 on the side opposite the other end 42 of the arm portion 38, sandwiching the weight 44, to prevent the weight 44 from falling off the support rod 46. In some embodiments, the torque adjustment unit 14 is configured to allow multiple weights 44 to be attached. This configuration can improve the accuracy of adjusting the torque at which the shaft 8 starts to rotate. In some embodiments, the notch forming device 4 is disposed so as to be closer to the one-side drum 52A than to the other-side drum 52B in the conveying direction D1. This configuration can ensure a conveying section for dewatering the gypsum slurry X1 in which the notches have been formed.

[0051] Fig. 9 is a diagram schematically illustrating the configuration of a gypsum recovery device 1 according to another embodiment. Fig. 10 is a diagram illustrating the layout of a hanging portion 12A(12) of a first notch forming device 4A(4) and a hanging portion 12B(12) of a second notch forming device 4B(4) according to another embodiment.

[0052] In another embodiment, as illustrated in Fig. 9, the gypsum recovery apparatus 1 includes a first notch forming device 4A and a second notch forming device 4B that is positioned differently in the conveyance direction D1 from the first notch forming device 4A. In the embodiment illustrated in Fig. 9, the first notch forming device 4A is disposed upstream of the second notch forming device 4B in the conveyance direction D1.

[0053] 10, the hanging portion 12A of the first notch forming device 4A and the hanging portion 12B of the second notch forming device 4B are located at different positions in the intersecting direction D2. In some embodiments, the tip 29A of the hanging portion 12A of the first notch forming device 4A and the tip 29B of the hanging portion 12B of the second notch forming device 4B are located at different positions in the intersecting direction D2. With this configuration, the first notch forming device 4A forms a notch in the surface of the gypsum slurry X1 that is different from the notch formed by the second notch forming device 4B. This further improves the dewatering performance of the gypsum recovery apparatus 1.

[0054] The contents described in each of the above embodiments can be understood, for example, as follows.

[0055] [1] A gypsum recovery apparatus (1) according to the present disclosure is a gypsum recovery apparatus for dehydrating a gypsum slurry (X1) to recover gypsum (X2), a conveying device (2) that conveys the gypsum slurry while it is placed on a filter cloth (6); At least one notch forming device (4) capable of forming a notch on the surface of the gypsum slurry being transported by the transport device, The at least one notch forming device A shaft (8) extending on the filter cloth along a cross direction (D2) intersecting a conveying direction (D1) of the gypsum slurry; a bearing portion (10) that rotatably supports the shaft; at least one depending member (12) configured to rotate with rotation of the shaft, the at least one depending member having one end (26) fixed to the shaft and another end (28) configured to be contactable with the surface of the gypsum slurry; and a torque adjusting section (14) configured to be able to adjust the rotation start torque at which the shaft starts to rotate.

[0056] According to the configuration described in [1] above, the notch forming device of the gypsum recovery device is configured to have an adjustable rotation start torque, so that the depth of the notches formed in the surface of the gypsum slurry can be set to a depth that promotes dehydration of the gypsum slurry depending on the state of the gypsum slurry transported by the transport device. Therefore, it is possible to provide a gypsum recovery device that can improve dehydration performance.

[0057] [2] In some embodiments, in the configuration described in [1] above, The torque adjustment unit an arm portion (38) having one end (40) fixed to the shaft and extending downstream in the conveying direction from the one end to the other end (42); The other end of the arm is configured so that a weight (44) can be attached thereto.

[0058] According to the configuration described in [2] above, the rotation start torque can be adjusted with a simple configuration.

[0059] [3] In some embodiments, in the configuration described in [2] above, The other end of the arm is configured so that the attachment position of the weight can be adjusted along the direction in which the arm extends.

[0060] According to the configuration described in [3] above, the rotation start torque can be adjusted without changing the mass of the weight.

[0061] [4] In some embodiments, in the configuration described in [2] or [3] above, The torque adjustment unit The arm further includes a stopper portion (41) provided below the arm portion and configured to stop the downward movement of the arm portion.

[0062] According to the configuration described in [4] above, the rotation of the shaft (the rotation of the hanging part) can be stopped via the arm part, which prevents the notch formed in the surface of the gypsum slurry by the other end of the hanging part from becoming too deep.

[0063] [5] In some embodiments, in the configuration described in [4] above, The stopper portion is configured so that its position in the vertical direction (D3) can be adjusted along the direction of gravity.

[0064] According to the configuration described in [5] above, by adjusting the vertical position of the stopper portion, it is possible to finely adjust the position of the other end of the hanging portion via the arm portion.

[0065] [6] In some embodiments, in the configuration described in any one of [1] to [5] above, The hanging portion includes a plate portion (30) having a plate shape, The hanging portion is fixed to the shaft so that the thickness direction (D4) of the plate portion coincides with the intersecting direction.

[0066] According to the configuration described in [6] above, compared to when the hanging portion has a rod shape, bending of the hanging portion due to contact with the surface of the gypsum slurry during transport can be suppressed.

[0067] [7] In some embodiments, in the configuration described in any one of [1] to [6] above, The bearing portion includes a rolling bearing.

[0068] According to the configuration described in [7] above, by using a rolling bearing as the bearing portion, the shaft slides smoothly relative to the bearing portion, and therefore the bearing portion can rotatably support the shaft with low friction.

[0069] [8] In some embodiments, in the configuration described in any one of [1] to [7] above, The at least one notch forming device a flange portion (34) attached to the shaft and having a flange surface (32) extending along the radially outer side of the shaft centered on the axis (O); A support base (16) that supports the bearing portion; The lock pin (45) is further included, which can be simultaneously inserted into both the first hole (35) formed in the flange surface and the second hole (17) formed in the support base.

[0070] According to the configuration described in [8] above, the position of the hanging part can be easily fixed by simultaneously inserting the lock pin into both the first hole in the flange surface and the second hole in the support base, which makes it easy to perform maintenance such as replacing the filter cloth.

[0071] [9] In some embodiments, in the configuration described in any one of [1] to [8] above, the at least one notch forming device includes a first notch forming device (4A) and a second notch forming device (4B) that is positioned differently in the conveyance direction from the first notch forming device, In the intersecting direction, the at least one hanging portion (12A) of the first notch forming device and the at least one hanging portion (12B) of the second notch forming device are at different positions from each other.

[0072] According to the configuration described in [9] above, the first notch forming device forms notches in the surface of the gypsum slurry that are different from the notches formed by the second notch forming device, which further improves the dewatering performance of the gypsum recovery device. [Explanation of symbols]

[0073] 1. Gypsum recovery device 2. Conveyor equipment 4. Notch forming device 4A First notch forming device 4B Second notch forming device 6 Filter cloth 8 shafts 10 Bearing section 12 Drooping part 12A Hanging part of first notch forming device 12B Hanging part of second notch forming device 14 Torque adjustment section 16 Support stand 17 2nd hole 26 One end of the hanging part 28 Other end of hanging part 30 Board part 32 Flange surface 34 Flange 35 1st hole 38 Arm section 40 One end of the arm 41 Stopper part 42 Other end of arm 44 weight 45 Lock pin D1 Conveying direction D2 Cross direction D3 Up and down direction D4 Thickness direction O Shaft axis X1 Gypsum slurry X2 plaster

Claims

1. A gypsum recovery device for dewatering a gypsum slurry and recovering gypsum, a conveying device that conveys the gypsum slurry on a filter cloth; At least one notch forming device capable of forming a notch on the surface of the gypsum slurry being transported by the transport device, The at least one notch forming device A shaft extending on the filter cloth along a direction intersecting a conveying direction of the gypsum slurry, where the direction intersecting the conveying direction of the gypsum slurry is defined as a cross direction; a bearing portion that rotatably supports the shaft; at least one hanging member configured to rotate with rotation of the shaft, the at least one hanging member having one end fixed to the shaft and the other end configured to be able to contact the surface of the gypsum slurry; a torque adjusting unit configured to adjust a rotation start torque at which the shaft starts to rotate, The torque adjustment unit an arm portion having one end fixed to the shaft and extending from the one end to the other end toward a downstream side in the conveying direction, The other end of the arm portion is configured to allow a weight to be attached thereto. Gypsum recovery device.

2. The other end of the arm portion is configured so that the attachment position of the weight can be adjusted along the extending direction of the arm portion. The gypsum recovery device according to claim 1.

3. The torque adjustment unit a stopper portion provided below the arm portion and configured to stop the downward movement of the arm portion; The gypsum recovery device according to claim 1 or 2.

4. The stopper portion is configured so that its position in the vertical direction can be adjusted along the direction of gravity. The gypsum recovery device according to claim 3.

5. the hanging portion includes a plate portion having a plate shape, The hanging portion is fixed to the shaft so that a thickness direction of the plate portion coincides with the intersecting direction. The gypsum recovery device according to any one of claims 1 to 4.

6. The bearing portion includes a rolling bearing. The gypsum recovery device according to any one of claims 1 to 5.

7. A gypsum recovery device for dehydrating a gypsum slurry and recovering gypsum, comprising: a conveying device that conveys the gypsum slurry on a filter cloth; At least one notch forming device capable of forming a notch on the surface of the gypsum slurry being transported by the transport device, The at least one notch forming device A shaft extending on the filter cloth along a direction intersecting a conveying direction of the gypsum slurry, where the direction intersecting the conveying direction of the gypsum slurry is defined as a cross direction; a bearing portion that rotatably supports the shaft; at least one hanging member configured to rotate with rotation of the shaft, the at least one hanging member having one end fixed to the shaft and the other end configured to be able to contact the surface of the gypsum slurry; a torque adjusting unit configured to adjust a rotation start torque at which the shaft starts to rotate, The at least one notch forming device a flange portion attached to the shaft and having a flange surface extending along the outer side in a radial direction centered on the axis of the shaft; a support base that supports the bearing portion; a lock pin that can be simultaneously inserted into both a first hole formed in the flange surface and a second hole formed in the support base. Gypsum recovery device.

8. the at least one notch forming device includes a first notch forming device and a second notch forming device that is positioned differently from the first notch forming device in the conveyance direction; In the intersecting direction, the at least one hanging portion of the first notch forming device and the at least one hanging portion of the second notch forming device are located at different positions from each other. The gypsum recovery device according to any one of claims 1 to 7.

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