JP2020058979A - Sludge dehydration device - Google Patents

Abstract

To provide a sludge dehydration device capable of treating continuously and is relatively simple in structure.SOLUTION: A sludge dehydration device (10) is provided, characterized by a lower belt conveyor (16) inclined upward from a sludge inlet (12) toward a sludge discharge port (14) and extending in a longitudinal direction from the sludge inlet to the sludge discharge port, and an upper belt conveyor (18) inclined upward above the lower belt conveyor so as to contact a conveyor belt of a lower belt conveyor and extending in a longitudinal direction from the middle of the lower belt conveyor to the sludge discharge port, in which a pitch of small diameter carrier rollers of the lower belt conveyor and large diameter carrier rollers of the upper belt conveyor are substantially the same.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sludge dewatering device that removes water from sludge.

  The sludge generated in the sewage treatment process of a sewage treatment plant, the waste liquid treatment process of a factory, etc. basically consists of solids and water. Therefore, when treating sludge, it is necessary to separate solid content and moisture. Conventionally, as a means for separating water from sludge, a filter press method in which sludge is wrapped in an accordion-like filter cloth to be dehydrated by shrinking it, in a device in which the spiral interval is gradually narrowed from the start point to the end point of the spiral shaft Known is a screw press method or the like in which sludge is introduced and dehydrated.

  However, since the filter pressing method is basically a batch process, the sludge to be processed cannot be continuously processed, and there is a problem that the processing amount is limited and the filter cloth is clogged. Further, the screw press method has a problem that the apparatus becomes relatively complicated and large-scale.

  The present invention has been developed in view of the above circumstances, and an object of the present invention is to provide a sludge dewatering device that can be continuously treated and has a relatively simple structure.

  The sludge dewatering device according to claim 1 of the present application comprises a lower belt conveyor which is inclined upward from the sludge inlet to the sludge outlet and extends in the longitudinal direction from the sludge inlet to the sludge outlet, Positioned above the lower belt conveyor inclining upward so as to contact the conveyor belt of the lower belt conveyor, the upper belt conveyor extending in the longitudinal direction from the middle of the lower belt conveyor to the sludge discharge port. And the pitch of the small-diameter carrier roller of the lower belt conveyor and the large-diameter carrier roller of the upper belt conveyor are substantially the same.

  In the sludge dewatering device according to claim 2 of the present application, in the sludge dewatering device according to claim 1, the upper belt conveyor includes a pair of left and right frames, and a drive pulley and a driven pulley respectively disposed at both ends of the frame. An endless conveyor belt hung between the driving pulley and the driven pulley, and a large number of carrier rollers supporting a lower portion of the conveyor belt, wherein the lower belt conveyor has a pair of left and right. Frame, a drive pulley and a driven pulley respectively arranged at both ends of the frame, an endless conveyor belt hung between the drive pulley and the driven pulley, and an upper portion of the conveyor belt. A plurality of carrier rollers, the lower surface of the frame of the upper belt conveyor and the frame of the lower belt conveyor. It is characterized in that the upper surface of which is configured to contact.

  The sludge dewatering device according to claim 3 of the present application is the sludge dewatering device according to claim 1 or 2, wherein the upper surface of the conveyor belt of the lower belt conveyor is higher than the upper surface of the frame of the lower belt conveyor. It is characterized in that it is arranged so as to be located below by a predetermined distance.

  The sludge dewatering device according to claim 4 of the present application is the sludge dewatering device according to any one of claims 1 to 3, wherein a gap is provided between the frame and both edges of the conveyor belt in the lower belt conveyor. Is configured so as not to substantially occur, and the upper belt conveyor is configured such that a gap is not substantially generated between the frame and both edges of the conveyor belt. Is.

  The sludge dewatering device according to claim 5 of the present application is the sludge dewatering device according to any one of claims 1 to 4, wherein the sludge input port has an end portion on the side of the upper belt conveyor that is the conveyance belt. It is characterized in that it is formed in a planar shape such that the width becomes narrower along the center line.

  According to the present invention, the sludge dewatering device 10 that can be continuously treated is obtained. In the sludge dewatering device 10, since the belt conveyor 16 is inclined downward toward the sludge input port 12, the water in the sludge flows down in the direction opposite to the transport direction. Further, since the sludge dewatering device 10 is roughly divided into a transport section and a dewatering section, the sludge dewatering apparatus 10 can be easily modified into a desired form according to the intended use. Further, in the sludge dewatering device 10, since the lower surface of each frame 18a of the upper belt conveyor 18 and the upper surface of each frame 16a of the lower belt conveyor 16 are configured to be in close contact with each other, sludge and water leak sideways. Can be prevented. Further, in the sludge dewatering device 10, the upper surface of the transport belt 16d is positioned in consideration of the thickness of the transport belt 18d and the thickness of the dehydrated solid content. Further, in the sludge dewatering device 10, since the belt conveyors 16 and 18 are configured so that there is substantially no gap between the frames 16a and 18a and both edges of the conveyor belts 16d and 18d, sludge and moisture are not generated. Leakage and outflow to the lower side can be avoided, and meandering of the conveyor belts 16d and 18d can be prevented. Further, in the sludge dewatering device 10, since the end portion 12a of the sludge input port 12 on the upper belt conveyor 18 side is formed in a flat shape such that the width becomes narrow, the entire sludge to be treated can be dehydrated evenly. it can. Since the sludge dewatering apparatus 10 of the present invention has a relatively simple structure, the manufacturing cost is relatively low and maintenance is easy.

It is a partial cutaway perspective view of the sludge dewatering device concerning a preferred embodiment of the present invention. It is a longitudinal direction sectional view of the sludge dewatering device of FIG. It is a perspective view which separated and showed the lower belt conveyor and the upper belt conveyor. FIG. 4A is an enlarged perspective view showing a starting end portion of the upper belt conveyor, and FIG. 4B is an enlarged sectional view showing a positional relationship between upper and lower carrier rollers. It is a top view of the sludge dewatering apparatus of FIG. It is an enlarged view of the part 6 of FIG. It is the perspective view which showed the sludge input port.

  Next, a sludge dewatering apparatus according to a preferred embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partially cutaway perspective view of a sludge dewatering device, and FIG. 2 is a longitudinal sectional view of the sludge dewatering device. A sludge dewatering apparatus according to a preferred embodiment of the present invention, which is generally designated by reference numeral 10 in FIGS. 1 and 2, is inclined upward from a sludge inlet 12 toward a sludge outlet 14, and from the sludge inlet 12 A lower belt conveyor 16 extending in the longitudinal direction up to the sludge discharge port 14 is provided.

  The lower belt conveyor 16 includes a pair of left and right frames 16a, a drive pulley 16b and a driven pulley 16c respectively arranged at both ends of the frame 16a, a motor (not shown) for rotationally driving the drive pulley 16b, and a drive. It has an endless conveyor belt 16d that is stretched between a pulley 16b and a driven pulley 16c, and a large number of carrier rollers 16e that support the upper portion of the conveyor belt 16d. The conveyor belt 16d is made of an elastic material such as rubber.

  Note that the lower belt conveyor 16 may be provided with a number of return rollers that support the lower portion (return portion) of the conveyor belt 16d and tension rollers that apply a tensile force to the conveyor belt 16d. Omitted for simplicity.

  The sludge dewatering device 10 also has an upper belt conveyor 18 that is positioned in a state of being inclined upward while being in contact with the upper side of the lower belt conveyor 16 and that extends in the longitudinal direction from the middle of the lower belt conveyor 16 to the sludge discharge port 14. I have it.

  The upper belt conveyor 18 includes a pair of left and right frames 18a, a driving pulley 18b and a driven pulley 18c arranged at both ends of the frame 18a, a motor (not shown) for rotating the driving pulley 18b, and a driving pulley. It has an endless conveyor belt 18d stretched between 18b and a driven pulley 18c, and a large number of carrier rollers 18e that support a lower portion of the conveyor belt 18d. The conveyor belt 18d is made of an elastic material such as rubber.

  It should be noted that the upper belt conveyor 18 may be provided with a number of return rollers that support the upper portion (return portion) of the conveyor belt 18d and tension rollers that apply a tensile force to the conveyor belt 18d, but the drawing is simplified. Therefore, it is omitted.

  The pitch of the carrier rollers 16e of the lower belt conveyor 16 and the pitch of the carrier rollers 18e of the upper belt conveyor 18 are substantially the same. That is, as best shown in FIG. 2, the center of rotation of each carrier roller 16e of the lower belt conveyor 16 and the center of rotation of each carrier roller 18e of the upper belt conveyor 18 are located on a line L orthogonal to the conveyor belt. Is configured to. Further, as illustrated, the carrier roller 16e has a small diameter and the carrier roller 18e has a large diameter. Here, the large diameter and the small diameter mean that they represent the relative diameters of the two (carrier rollers 16e, 18e), and do not represent concrete diameters. Since the upper and lower carrier rollers 16e and 18e have substantially the same pitch and the upper carrier rollers 18e have a relatively large diameter, the sludge to be treated that travels between the upper and lower conveyor belts 16d and 18d is Therefore, a large compressive force is applied to the places where the carrier rollers 16e and 18e are located, whereby the sludge to be treated can be efficiently compressed.

  As shown in FIG. 2, the sludge treatment device 10 is roughly divided into a transport section in which only the lower belt conveyor 16 is arranged and a dehydration section in which both the lower belt conveyor 16 and the upper belt conveyor 18 are arranged. It Thereby, the sludge dewatering device 10 can be designed as desired according to the application and various installation conditions. For example, if it is desirable to separate the generation (input) location of treated sludge and the discharge location after treatment, increase the distance of the transport section, or the type of treated sludge is difficult to treat. In such a case, it is possible to increase the distance of the dehydration section. Further, although the sludge treatment device 10 shown in the figure is shown with the transport section and the dehydration section being integrated, it is also possible to manufacture the transport section and the dehydration section separately and to connect the both when used. Is.

  Preferably, the lower surface of each frame 18a of the upper belt conveyor 18 and the upper surface of each frame 16a of the lower belt conveyor 16 are configured to be in close contact with each other, as shown in FIG. 4 (a). As a result, it is possible to prevent sludge and water from leaking sideways.

  Further, preferably, the upper surface of the conveyor belt 16d of the lower belt conveyor 16 is configured to be located below the upper surface of each frame 16a by a distance x, as shown in FIG. 4B. The distance x is usually about 3 mm to 5 mm. This is because the thickness of the conveyor belt 18d and the thickness of the dehydrated solids (dehydrated cake) are taken into consideration (that is, unless configured in this way, the frame of the lower belt conveyor 16). This is because there was a concern that the solid content would move above 16a).

  As shown in FIG. 6, in the lower belt conveyor 16, there is substantially no gap between each frame 16a and both edges 16d1 and 16d2 of the conveyor belt 16d. Similarly, in the upper belt conveyor 18, there is substantially no gap between each frame 18a and both edges 18d1 and 18d2 of the conveyor belt 18d. As a result, it is possible to prevent sludge and water from leaking and flowing downward, and it is possible to prevent the meandering of the conveyor belts 16d and 18d.

  FIG. 7: is a perspective view which showed the sludge input port 12 of a preferable form. The sludge input port 12 shown in FIG. 7 is located on the dewatering section side (hence, on the upper belt conveyor 18 side) and has a short side wall 12 a arranged so as to be orthogonal to the transport direction of the lower belt conveyor 16. , A long side wall 12b located on the opposite side of the short side wall 12a and arranged in parallel with the short side wall 12a, and a pair of oblique side walls 12c, 12d connecting the short side wall 12a and the long side wall 12b. It has a trapezoidal shape in plan view. An opening 12a1 is provided in the short side wall 12a, and elongated rubber pieces 12b1, 12c1, 12d1 are attached to the lower ends of the long side wall 12b and the oblique side walls 12c, 12d, respectively. The upper and lower surfaces of the sludge inlet 12 are open, and the lower surface (hence, rubber pieces 12b1, 12c1, 12d1) are placed on the conveyor belt 16d of the lower belt conveyor 16.

  By forming the planar shape of the sludge inlet 12 so that the side of the upper belt conveyor 18 becomes narrower as described above, the sludge to be treated introduced into the sludge inlet 12 is transferred from the opening 12a1 to the center of the conveyor belt 16d. Since it comes out in a state where it converges near the line, the whole sludge to be treated can be dehydrated evenly. That is, when the sludge to be treated is compressed between the conveyor belts 16d and 18d, the sludge tries to escape to both ends of the conveyor belts 16d and 18d, but by first converging the sludge to be treated near the center line of the conveyor belt 16d. It is possible to avoid such a situation as much as possible.

  Since the rubber pieces 12b1, 12c1, 12d1 are provided at the lower end of the sludge inlet 12, the upper surface of the conveyor belt 16d and the rubber pieces 12b1, 12c1, 12d1 are always in contact with each other. A part of the water content of the sludge to be treated flows out from the sludge treatment port 12 through the gap generated by the friction fluctuation with the rubber pieces 12b1, 12c1, 12d1 and is discharged from the discharge port 20.

  The use of the sludge dewatering device 10 configured as above will be described. As shown in FIG. 2, the sludge to be treated is introduced into the sludge inlet 12 and the belt conveyors 16 and 18 are driven. Then, the inputted sludge to be treated exits in a state of being converged near the center line of the conveyor belt 16d due to the characteristic planar shape of the sludge inlet 12, and is conveyed to the dewatering section in which the upper belt conveyor 18 is arranged. It Then, the sludge to be treated is compressed in the dehydration section, and the dehydrated solid content is discharged from the sludge discharge port 14. On the other hand, the water in the sludge to be treated flows down on the conveyor belt 16d by gravity and is discharged from the discharge port 20 located in the lower part of the sludge dewatering device 10.

  The present invention is not limited to the above-described embodiments of the invention, and various modifications are possible within the scope of the invention described in the claims, and they are also included in the scope of the invention. It goes without saying that it is one.

  For example, the details and dimensions of each component of the illustrated sludge dewatering device 10 (sludge input port 12, sludge discharge port 14, lower belt conveyor 16, upper belt conveyor 18, drainage port 20, support post 22), radix, etc. Are merely exemplary.

10 Sludge Dewatering Device 12 Sludge Inlet 12a Short Side Wall 12a1 Exit Opening 12b Long Side Wall 12b1 Rubber Piece 12c Inclined Side Wall 12c1 Rubber Piece 12d Inclined Side Wall 12d1 Rubber Piece 14 Sludge Outlet 16 Lower Belt Conveyor 16a Frame 16b Drive Pulley 16c Driven Pulley 16d Conveyor belt 16e Carrier roller 18 Upper belt conveyor 18a Frame 18b Drive pulley 18c Driven pulley 18d Conveyor belt 18e Carrier roller 20 Drain port 22 Strut

Claims (5)

A sludge dewatering device for removing water from sludge,
A lower belt conveyor inclined in an upward direction from the sludge inlet to the sludge outlet, and extending in the longitudinal direction from the sludge inlet to the sludge outlet,
The upper belt conveyor is located above the lower belt conveyor and is inclined upward so as to contact the conveyor belt of the lower belt conveyor, and extends in the longitudinal direction from the middle of the lower belt conveyor to the sludge discharge port. With and
A sludge dewatering device, wherein the small-diameter carrier rollers of the lower belt conveyor and the large-diameter carrier rollers of the upper belt conveyor have substantially the same pitch. The upper belt conveyor, a pair of left and right frames, a driving pulley and a driven pulley respectively disposed at both ends of the frame, an endless conveyor belt hung between the driving pulley and the driven pulley, With a number of carrier rollers supporting the lower part of the conveyor belt,
The lower belt conveyor is a pair of left and right frames, a driving pulley and a driven pulley respectively arranged at both ends of the frame, and an endless conveyor belt hung between the driving pulley and the driven pulley, A plurality of carrier rollers supporting the upper portion of the conveyor belt,
The sludge dewatering device according to claim 1, wherein a lower surface of the frame of the upper belt conveyor and an upper surface of the frame of the lower belt conveyor are configured to be in close contact with each other.   The upper surface of the conveyor belt of the lower belt conveyor is configured to be located below the upper surface of the frame of the lower belt conveyor by a predetermined distance. Sludge dewatering device.   In the lower belt conveyor, it is configured so that a gap does not substantially occur between the frame and both edges of the conveyor belt, and in the upper belt conveyor, between the frame and both edges of the conveyor belt. The sludge dewatering device according to any one of claims 1 to 3, characterized in that a gap is substantially not formed in the.   The sludge inlet is formed in a planar shape such that the end portion on the side of the upper belt conveyor becomes narrower along the center line of the conveyor belt. The sludge dewatering device described in any one of 1.

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