JP2014226619A - Multiple plate type screw press dehydrator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multiple plate type screw press dehydrator capable of properly eliminating or preventing the jam of a dehydration object.SOLUTION: A multiple plate type screw press dehydrator 1 comprises: a plurality of first annular plates 20; a plurality of second annular plates 30; a screw conveyor 40 arranged in spaces inside of the first annular plates 20 and the second annular plates 30; and a motor 50 for rotating the screw conveyor 40. Between any two of the first annular plates 20 and the second annular plates 30, there is arranged a holed annular plate 60 which is formed with a hole 65 for providing communication between the radial inside and outside.

Description

  The present invention relates to a multi-plate screw press dehydrator.

  Conventionally, a multi-plate screw press dehydrator is known as a compact dehydrator with low power consumption. The multi-plate screw press dehydrator includes a plurality of large-diameter annular plates arranged in the axial direction at intervals, a plurality of small-diameter annular plates disposed between the large-diameter annular plates, a large-diameter annular plate and a small-diameter A screw conveyor disposed in a space inside the annular plate and having a spiral blade portion. The inner diameter and outer diameter of the small-diameter annular plate are smaller than the inner diameter and outer diameter of the large-diameter annular plate, respectively, and when the screw conveyor rotates, the blade portion of the screw conveyor slidably contacts the inner peripheral surface of the small-diameter annular plate, The small-diameter annular plate is pushed by the screw conveyor and performs eccentric rotational movement. The object to be dehydrated is compressed by a screw conveyor in a space inside the large-diameter annular plate and the small-diameter annular plate (hereinafter, the entire large-diameter annular plate and small-diameter annular plate are referred to as multiple plates). Thereby, the object to be dehydrated is dehydrated. The water removed from the object to be dehydrated is discharged outside the multiple plate through the gap between the large-diameter annular plate and the small-diameter annular plate.

  In the multi-plate screw press dehydrator, the small-diameter annular plate performs an eccentric rotational motion between the large-diameter annular plates, so that it is possible to suppress to some extent the dehydration object is clogged between these plates. However, in spite of this, the object to be dehydrated may be clogged after a long operation. Therefore, conventionally, it has been known that washing water is sprayed from the outside of the multiplex plate to wash off the dehydration object from the multiplex plate and the screw conveyor (see Patent Document 1).

  However, in the method of spraying cleaning water from the outside of the multiple plate, the inside of the multiple plate and the screw conveyor cannot be washed effectively, and there is a problem that a large amount of water must be used for a long time. there were. Therefore, in Patent Document 2, a cleaning water flow path is formed inside the screw conveyor, a plurality of nozzles are formed on the outer peripheral surface of the screw conveyor, and the cleaning water is directly injected from the nozzles to the inside of the multiplex plate. It has been proposed.

Japanese Patent Laid-Open No. 2001-25618 JP 2000-15014 A

  In the above prior art, it is possible to inject cleaning water into the inner side of the multiple plate, but the flow path and nozzle of the cleaning water must be formed in the screw conveyor itself, and the configuration of the screw conveyor becomes complicated.

  Moreover, in the said prior art, since the screw conveyor is enclosed by the multi-plate, the state of the dehydration target object currently conveyed to the screw conveyor cannot be detected. However, if it is possible to detect the state of the object to be dewatered carried on the screw conveyor, it is possible to appropriately determine the timing for injecting the washing water onto the multiple plates, or to prevent the object to be dehydrated from clogging in advance. It is possible to take measures.

  This invention is made | formed in view of this point, The objective is to provide the multiplate screw press dehydrator which can perform suitably the removal or prevention of the clogging of the dehydration target object.

  A multi-plate screw press dehydrator according to the present invention is disposed between a plurality of first annular plates arranged in the axial direction with a space between each other, and the first annular plate, respectively, from an inner diameter of the first annular plate A plurality of second annular plates having an inner diameter that is smaller than an outer diameter of the first annular plate, and the first annular plate so as to penetrate the first annular plate and the second annular plate. A screw conveyor that is disposed in a space inside the second annular plate and has a shaft portion and a blade portion that spirally extends around the shaft portion, and a drive device that rotates the screw conveyor, and A multi-plate screw press dehydrator that performs eccentric rotational movement between the first annular plates when the second annular plate is pushed by the blades as the screw conveyor rotates. Between any two of the plurality of first annular plates and the plurality of second annular plates, a perforated annular plate in which a hole that communicates radially inside and outside is formed.

Another multi-plate screw press dehydrator according to the present invention is disposed between a plurality of first annular plates arranged in the axial direction at intervals from each other, and each of the first annular plates. A plurality of second annular plates having an inner diameter smaller than the inner diameter and having an outer diameter smaller than the outer diameter of the first annular plate, and arranged in one of the axial directions of the first annular plate and the second annular plate A wall member having a hole formed therein, and the first annular plate and the second annular plate are inserted through the hole of the wall member and penetrate the first annular plate and the second annular plate. A screw conveyor disposed in an inner space and having a shaft portion and a blade portion extending spirally around the shaft portion;
A drive device for rotating the screw conveyor, and a multi-plate screw press that performs an eccentric rotational motion between the first annular plates when the second annular plate is pushed by the blades as the screw conveyor rotates. It is a dehydrator. Between the first annular plate and the second annular plate, an annular plate facing the wall member and the wall member, a perforated annular plate in which a hole communicating in the radial direction is formed. Yes.

  According to the multi-plate screw press dehydrator, it becomes possible to remove or prevent clogging of the object to be dehydrated through the holes of the perforated annular plate. For example, cleaning water or the like can be supplied from the outside to the inside of the first annular plate and the second annular plate (hereinafter, the entire first annular plate and the second annular plate are collectively referred to as a multiple plate). . Therefore, it is possible to supply cleaning water or the like directly to the inside of the multiple plate without complicating the configuration of the screw conveyor. Further, it is possible to detect the state of the dewatering object inside the multiple plate through the hole of the perforated annular plate. Alternatively, the object to be dehydrated inside the multiplex plate can be sampled from the hole of the perforated annular plate, and the state of the object to be dehydrated can be examined outside the multiplex plate. As described above, according to the above-described multi-plate screw press dehydrator, it is possible to suitably remove or prevent clogging of an object to be dehydrated.

  According to a preferred aspect of the present invention, the perforated annular plate includes an arc-shaped first member, an arc-shaped second member, and a coupling for detachably coupling the first member and the second member. With tools.

  According to the above aspect, the perforated annular plate can be installed without removing the screw conveyor by connecting the first member and the second member around the screw conveyor with the coupler so as to surround the screw conveyor. It becomes possible. This facilitates the installation of the perforated annular plate. Moreover, it becomes easy to additionally install a perforated annular plate with respect to an existing multi-plate screw press dehydrator that is not provided with a perforated annular plate.

  According to another preferable aspect of the present invention, the sensor includes a sensor that is attached to the hole of the perforated annular plate and detects a state of a dewatering object that is carried to the screw conveyor.

  According to the said aspect, it becomes possible to detect the state of the dehydration target object inside a multiple plate with a sensor. Thereby, clogging can be removed or prevented according to the state of the object to be dehydrated.

  According to another preferable aspect of the present invention, the sensor is a pressure sensor.

  According to the said aspect, it becomes possible to detect the pressure of the dehydration target object inside a multiple plate. Thereby, based on the pressure of the object to be dehydrated, it is possible to remove or prevent clogging of the object to be dehydrated.

  According to another preferred embodiment of the present invention, the sensor is a viscosity sensor.

  According to the above aspect, it is possible to detect the viscosity of the object to be dehydrated inside the multiple plate. Thereby, based on the viscosity of the object to be dehydrated, it is possible to remove or prevent clogging of the object to be dehydrated.

  According to another preferable aspect of the present invention, a control device is provided that controls the rotational speed of the screw conveyor based on the detection value of the sensor.

  According to the said aspect, the rotational speed of a screw conveyor can be adjusted automatically according to the state of the dehydration target detected by the sensor. Thereby, it is possible to automatically remove or prevent clogging of the object to be dehydrated.

  According to another preferable aspect of the present invention, the apparatus includes a supply device that is attached to the hole of the perforated annular plate and supplies fluid to a space inside the first annular plate and the second annular plate. .

  According to the said aspect, the inside of a 1st annular plate and a 2nd annular plate or a screw conveyor can be wash | cleaned directly with the fluid which a supply apparatus supplies.

  According to another preferable aspect of the present invention, the supply device is a nozzle for ejecting fluid.

  According to the said aspect, the inside of a 1st annular plate and a 2nd annular plate or a screw conveyor can be wash | cleaned directly with the fluid injected from a nozzle.

  According to another preferred aspect of the present invention, the object to be dewatered carried by the screw conveyor is sludge, attached to the hole of the perforated annular plate, and the first annular plate and the second annular plate. A supply device for supplying the flocculant to the inner space is provided.

  According to the above aspect, the flocculant can be mixed with the sludge inside the first annular plate and the second annular plate. Thereby, the property of sludge can be changed inside the 1st annular board and the 2nd annular board.

  According to another preferred aspect of the present invention, the screw conveyor is configured to carry a dehydration object from one end of the shaft portion to the other end. The perforated annular plate is different from the intermediate position between the annular plate located closest to the one end and the annular plate located closest to the other end of the first annular plate and the second annular plate. It is arranged on the end side.

  When the screw conveyor is configured to carry the object to be dehydrated from one end of the shaft portion to the other end, the water content of the object to be dehydrated decreases from one end of the shaft portion to the other end, and the object to be dehydrated is clogged. It tends to be easier. According to the above aspect, since the perforated annular plate is arranged on the other end side of the shaft portion, in the portion where the object to be dewatered is easily clogged, the state of the object to be dewatered is detected, the multiplex plate or the screw conveyor is washed, etc. It can be carried out.

  According to another preferable aspect of the present invention, a plurality of the holes are formed in the perforated annular plate.

  According to the above aspect, for example, a plurality of perforated annular plates are formed at the same time, such as attaching a sensor for detecting the state of the dehydration target to any one hole and attaching a nozzle for injecting cleaning water to the other hole. It can be used for applications.

  According to another preferable aspect of the present invention, a plurality of the holes are formed in the perforated annular plate, or a plurality of the perforated annular plates are arranged. The multi-plate screw press dehydrator is attached to at least one hole and is attached to at least one other hole, a sensor for detecting a state of an object to be dehydrated conveyed to the screw conveyor, and the first annular plate. And a supply device that supplies fluid to the space inside the second annular plate, and a control device that controls the supply device based on a detection value of the sensor.

  According to the said aspect, a supply apparatus can be controlled according to the state of the dehydration target detected by the sensor. Thereby, it is possible to automatically remove or prevent clogging of the object to be dehydrated.

  ADVANTAGE OF THE INVENTION According to this invention, the multiple plate type screw press dehydrator which can perform suitably the removal or prevention of the blockage | dehydration target object can be provided.

It is a vertical sectional view of a multiple plate type screw press sludge dehydrator according to an embodiment. It is sectional drawing which looked at the screw conveyor and the multiple plate from the side. It is a perspective view of a 1st annular plate and a 2nd annular plate. It is a front view of a 1st annular plate and a 2nd annular plate. It is sectional drawing of the perforated annular plate which concerns on embodiment. It is a top view of the perforated annular plate which concerns on embodiment. It is a side view of the perforated annular plate which concerns on embodiment. It is sectional drawing of the perforated annular plate which concerns on other embodiment. It is sectional drawing of the perforated annular plate to which the sensor was attached. It is sectional drawing of the perforated annular plate to which the supply apparatus was attached. It is a vertical sectional view of a multiple plate type screw press sludge dehydrator according to another embodiment. It is a vertical sectional view of a multiple plate type screw press sludge dehydrator according to another embodiment. It is a block diagram of the control system of a supply apparatus. It is a block diagram of a motor control system.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the multiple plate type screw press dehydrator according to this embodiment is a multiple plate type screw press sludge dehydrator (hereinafter simply referred to as a sludge dehydrator) 1 for dewatering sludge. In the present embodiment, the object to be dehydrated is sludge. The sludge dewatering machine 1 includes a casing 10, a multiple plate 5, a screw conveyor 40, and a motor 50.

  The casing 10 includes a dewatering tank 11 in which the multiplex plate 5 is accommodated, a sludge input unit 12 into which sludge is input, and a dehydrated cake carry-out unit 13 that carries out the dehydrated cake that is the sludge after dehydration. In the present embodiment, the dewatering tank 11 is inclined obliquely upward from one end to the other end. However, the dewatering tank 11 may be arranged horizontally. The sludge charging unit 12 is connected to one end of the dewatering tank 11, and the dewatered cake carry-out unit 13 is connected to the other end of the dewatering tank 11. The sludge inlet 12a is formed with a sludge inlet 12a that opens obliquely upward. The dehydrated cake carry-out portion 13 is formed with a dehydrated cake carry-out port 13a that opens obliquely downward. The sludge inlet 12a may be opened vertically upward, and the dewatered cake carry-out port 13a may be opened vertically downward. A drain port 14 is provided at the bottom of the dewatering tank 11 for discharging water removed from the sludge and water sprayed from a cleaning nozzle 18 described later.

  The multiple plate 5 includes a plurality of first annular plates 20 and a plurality of second annular plates 30. As shown in FIG. 2, the first annular plates 20 are arranged in the axial direction, and a space is provided between adjacent first annular plates 20. The axial direction of the first annular plate 20 is a direction in which a line passing through the center of the first annular plate 20 and perpendicular to the surface of the first annular plate 20 extends. The second annular plate 30 is disposed between the first annular plates 20. As shown in FIG. 3, a spacer 23 protruding from the surface 21 may be provided on the first annular plate 20 so that a predetermined interval is provided between adjacent first annular plates 20. Both the outer and inner contours of the first annular plate 20 and the outer and inner contours of the second annular plate 30 are perfectly circular. The inner diameter 30di of the second annular plate 30 is smaller than the inner diameter 20di of the first annular plate 20, and the outer diameter 30do of the second annular plate 30 is smaller than the outer diameter 20do of the first annular plate 20. As shown in FIG. 2, the thickness 30 t of the second annular plate 30 is smaller than the thickness 20 t of the first annular plate 20. However, the thickness 30t of the second annular plate 30 may be equal to the thickness 20t of the first annular plate 20, or may be larger than the thickness 20t of the first annular plate 20.

  As shown in FIG. 4, a rod 27 extending in the axial direction is disposed around the first annular plate 20. The first annular plate 20 is supported by the rod 27. Each rod 27 may be bridged from the wall 11a on one end side of the dewatering tank 11 to the wall 11b on the other end side (see FIG. 1), or a frame for supporting the rod 27 is provided in the dewatering tank 11. , It may be fixed to the frame. The number and position of the rods 27 are not particularly limited, but in the present embodiment, the rods 27 are respectively disposed below the first annular plate 20, diagonally downward left, diagonally downward right, leftward, rightward, and upward. . Of these rods 27, at least the upper rod 27 is configured to be freely attached and detached. As will be described later, the first annular plate 20 and the second annular plate 30 can move freely, but the rods 27 prevent the first annular plate 20 and the second annular plate 30 from falling off. The configuration for preventing the first annular plate 20 from falling off is not particularly limited. For example, it is possible to prevent the first annular plate 20 from falling off by forming holes in the first annular plate 20 and passing a rod through these holes. In this case, the first annular plate 20 is fixed by the rod and cannot be moved freely. Thus, the first annular plate 20 may be allowed to move or may not be allowed to move.

  As shown in FIG. 1, the screw conveyor 40 is disposed in a space inside the first annular plate 20 and the second annular plate 30 so as to penetrate the first annular plate 20 and the second annular plate 30. The screw conveyor 40 includes a shaft portion 41 extending in the axial direction of the first annular plate 20 and a blade portion 42 extending spirally around the shaft portion 41. The pitch 42p of the blade | wing part 42 is so small that it goes to the dewatered cake carrying-out part 13 side from the sludge input part 12 side. Thus, the sludge is conveyed by the screw conveyor 40 from the sludge input part 12 side toward the dehydrated cake carry-out part 13 side, and is compressed along with the conveyance.

  As shown in FIG. 2, the distance 42r from the center 41c of the shaft portion 41 to the tip of the blade portion 42 is larger than ½ of the inner diameter 30di of the second annular plate 30, and the inner diameter 20di of the first annular plate 20 is larger. 1/2 or less. Since the distance 42r is larger than ½ of the inner diameter 30di of the second annular plate 30, when the screw conveyor 40 rotates, the tip of the blade portion 42 comes into sliding contact with the inner peripheral surface of the second annular plate 30, and the second annular plate 30 The plate 30 is pushed in the radial direction by the blade portion 42. As a result, as shown in FIG. 4, the second annular plate 30 performs an eccentric rotational motion. In other words, the second annular plate 30 floats so that the center of the second annular plate 30 circulates around the center of the first annular plate 20. As the second annular plate 30 performs eccentric rotational movement between the adjacent first annular plates 20, sludge between the first annular plates 20 and between the second annular plates 30 is scraped off.

  As shown in FIG. 1, the motor 50 is connected to the shaft portion 41 of the screw conveyor 40 through a gear or the like (not shown). The motor 50 is an example of a drive device that rotates the screw conveyor 40. However, the drive device is not limited to the motor 50, and various known drive devices can be suitably used.

  A plurality of cleaning nozzles 18 are arranged in the dewatering tank 11. Each cleaning nozzle 18 is connected to a water supply pipe 19. The cleaning nozzle 18 is disposed around the multiple plate 5 and jets water toward the multiple plate 5. In the present embodiment, the cleaning nozzle 18 is disposed above the multiple plate 5. However, the position and the number of the cleaning nozzles 18 are not particularly limited. Further, the cleaning nozzle 18 is not always necessary and can be omitted.

  By the way, since the screw conveyor 40 is surrounded by the multiplex plate 5 (that is, the first annular plate 20 and the second annular plate 30), the state of the sludge conveyed to the screw conveyor 40 as it is is detected or multiplexed. Cleaning water or the like cannot be directly supplied to the inside of the plate 5. Therefore, in the sludge dewatering machine 1 according to the present embodiment, a perforated annular plate 60 in which a hole 65 communicating between the inside and the outside in the radial direction is formed is inserted into the multiple plate 5.

  5 is a cross-sectional view of the perforated annular plate 60, FIG. 6 is a plan view of the perforated annular plate 60, and FIG. As shown in FIGS. 5 to 7, the perforated annular plate 60 according to the present embodiment includes a semicircular arc-shaped first member 61, a semicircular arc-shaped second member 62, a first member 61, and a second member. The bolt 63 is configured to be detachably coupled to 62. The perforated annular plate 60 is formed so as to be disassembled. In this embodiment, the number of members constituting the perforated annular plate 60 is two, but the number may be three or more. For example, the perforated annular plate 60 may include an arc-shaped first member, a second member, and a third member, which may be detachably coupled by a coupling tool such as a bolt.

  As shown in FIG. 8, the perforated annular plate 60 may be configured by a single member. In other words, the perforated annular plate 60 may be a single piece.

  The perforated annular plate 60 is an annular plate having at least one hole 65 communicating between the inside and the outside in the radial direction. The term “annular” as used herein means a shape that simply goes around the center, The contour is not limited to a perfect circle. As shown in FIG. 5, in this embodiment, the inner contour of the perforated annular plate 60 is a perfect circle, but the outer contour is not a perfect circle.

  As shown in FIG. 1, the thickness of the perforated annular plate 60 is larger than the thickness of the first annular plate 20 and larger than the thickness of the second annular plate 30. The thickness of the perforated annular plate 60 is not particularly limited, but is preferably a thickness that can form a good hole penetrating the inside and outside in the radial direction. For example, the thickness of the perforated annular plate 60 may be 5 to 30 times the thickness of the first annular plate 20 or 10 to 20 times.

  The number of holes 65 in the perforated annular plate 60 is not particularly limited. The number of holes 65 in the perforated annular plate 60 may be one or plural. As shown in FIG. 5, in the present embodiment, five holes 65 are formed in the perforated annular plate 60. Specifically, holes 65 are respectively formed in the upper portion of the perforated annular plate 60, the upper left portion, the upper right portion, the lower left portion, and the lower right portion. However, the position of the hole 65 is not particularly limited. A hole 65 may be formed in the left, right, or lower part of the perforated annular plate 60. The shape of the hole 65 is not limited, and may be a perfect circle, an ellipse, or a rectangle, for example. The hole 65 may be a hole that is straight toward the radial direction of the perforated annular plate 60, or may be a hole that is reduced or expanded in diameter from the outer side in the radial direction of the perforated annular plate 60. . The hole 65 may be a so-called counterbore so that a sensor or the like to be described later can be easily attached. A step may be provided on the inner peripheral surface of the hole 65. The inner peripheral surface of the hole 65 may be a smooth surface, and a spiral groove may be formed on the inner peripheral surface of the hole 65 so that a sensor having a male thread portion can be easily attached. That is, the hole 65 may be a screw hole. The shape and size of the holes 65 may be the same or different. In the present embodiment, the upper, left diagonally lower, and right diagonally lower holes 65 are substantially stepless holes on the inner peripheral surface, but the left diagonal upper and right diagonal upper holes 65 are inner peripheral surfaces. It is a hole with a step.

  As shown in FIG. 1, the screw conveyor 40 is configured to carry sludge from one end 41 a of the shaft portion 41 to the other end 41 b. The perforated annular plate 60 is an intermediate position 20c between the annular plate 20a located closest to the one end 41a and the annular plate 20b located closest to the other end 41b of the first annular plate 20 and the second annular plate 30. Is also arranged on the other end 41b side. The intermediate position 20c between the annular plate 20a and the annular plate 20b is an intermediate position between the surface on the one end 41a side of the annular plate 20a and the surface on the other end 41b side of the annular plate 20b. The intermediate position in the axial direction. However, the position of the perforated annular plate 60 is not particularly limited. In this embodiment, the number of perforated annular plates 60 is one, but a plurality of perforated annular plates 60 may be provided.

  The perforated annular plate 60 is sandwiched between any two of the plurality of first annular plates 20 and the plurality of second annular plates 30. In the present embodiment, the perforated annular plate 60 is sandwiched between the two first annular plates 20. Similar to the first annular plate 20, the aforementioned rods 27 (see FIG. 4) are respectively arranged below the perforated annular plate 60, diagonally downward left, diagonally downward right, leftward, rightward and upward. The perforated annular plate 60 is supported by the rod 27 and is prevented from falling off by the rod 27. Similar to the first annular plate 20, the perforated annular plate 60 is free to move. However, similarly to the first annular plate 20, the perforated annular plate 60 may be fixed to the rod 27 to make it non-movable. In addition, another support member may be provided on the perforated annular plate 60, and the perforated annular plate 60 may be supported by the support member so as not to move freely. The configuration for supporting the perforated annular plate 60 is not particularly limited.

  As will be described later, the hole 65 of the perforated annular plate 60 can be used for various purposes. However, if the hole 65 is always open when the sludge is dewatered by the sludge dehydrator 1, the sludge may leak from the hole 65. Therefore, the hole 65 may be appropriately closed with a stopper (not shown).

  Next, the operation of the sludge dehydrator 1 will be described. When sludge mixed with sludge or flocculant (hereinafter simply referred to as sludge) is introduced from the sludge inlet 12a, the sludge is conveyed from the sludge inlet 12 side to the dehydrated cake outlet 13 side by the screw conveyor 40. The screw conveyor 40 is surrounded by the multiplex plate 5, and the pitch 42p of the blade part 42 becomes smaller from the sludge input part 12 side to the dehydrated cake carry-out part 13 side. Compressed by the portion 42, the first annular plate 20 and the second annular plate 30, the water contained in the sludge is removed. The removed water flows downward through the gap between the first annular plate 20 and the second annular plate 30. The sludge is gradually dehydrated while gradually moving toward the dehydrated cake carry-out section 13 side. The sludge after dehydration becomes a dehydrated cake and is carried out from the dehydrated cake carry-out port 13a.

  Thus, with the rotation of the screw conveyor 40, the sludge gradually moves toward the dehydrated cake carry-out section 13 and the moisture content of the sludge gradually decreases. Along with this, the viscosity of the sludge increases. When the viscosity of the sludge increases, the sludge is easily clogged with the multiple plate 5. However, as described above, the second annular plate 30 performs an eccentric rotational motion with the rotation of the screw conveyor 40, and the sludge between the first annular plates 20 and between the second annular plates 30 is scraped off. Further, cleaning water is jetted from the cleaning nozzle 18 onto the multiple plate 5. Thereby, clogging of the multiple plate 5 by sludge is suppressed.

  However, it is difficult to completely prevent sludge from accumulating between the multiple plates 5, and sludge clogging may occur after a long period of operation. Once clogging occurs, the operation of the sludge dewatering machine 1 must be stopped and the clogged sludge must be removed. Therefore, it is desirable to detect whether or not clogging is likely to occur and to take measures to prevent it if clogging is likely to occur. In addition, when clogging occurs, it is desirable to quickly clean the multiple plate 5 and the screw conveyor 40 to remove the clogged sludge. As will be described below, the perforated annular plate 60 is particularly useful for removing or preventing sludge clogging.

  Next, an example of how to use the perforated annular plate 60 will be described. First, the perforated annular plate 60 can be used for the purpose of taking out the sludge inside the multiple plate 5 to the outside of the multiple plate 5. If the sludge inside the multiplex plate 5 can be taken out, the state of the sludge can be examined outside the multiplex plate 5, and it can be determined whether clogging is likely to occur based on the state of the sludge. However, since only a slight gap is formed between the first annular plate 20 and the second annular plate 30, sludge cannot be taken out from the gap. However, since the hole 65 is formed in the perforated annular plate 60, sludge can be taken out from the hole 65. For example, it is possible to insert an instrument for sampling from the outside to the inside of the hole 65 and take out the sludge using the instrument. Alternatively, during the operation of the sludge dewatering machine 1, the pressure inside the multiple plate 5 is higher than the outside pressure. Therefore, when the sludge dewatering machine 1 is operated with the hole 65 opened, the sludge automatically passes through the hole 65. To be taken out. Therefore, it is possible to take out sludge without using an instrument for sampling. The state of the sludge taken out to the outside of the multiple plate 5 can be examined by, for example, visual observation, tactile observation, viscosity measurement with a viscometer, moisture content measurement with a moisture meter, or the like. When it is determined that clogging is likely to occur from the state of sludge, clogging can be prevented by taking measures to avoid clogging. Although the measure for avoiding clogging is not particularly limited, for example, increasing the rotational speed of the screw conveyor 40 can be mentioned.

  As shown in FIG. 9, a sensor 55 that detects the state of sludge may be attached to the hole 65 of the perforated annular plate 60. If the state of the sludge is detected by the sensor 55, it is not necessary to take out the sludge to the outside of the multiple plate 5. Although the kind of sensor 55 is not specifically limited, As a physical quantity which has a correlation with generation | occurrence | production of clogging, the viscosity and pressure of sludge are mentioned, for example. Therefore, a viscosity sensor or a pressure sensor can be suitably used as the sensor 55. A viscosity sensor is attached to the hole 65 of the perforated annular plate 60, and the viscosity of the sludge inside the multiple plate 5 is measured by this viscosity sensor. Based on the viscosity, it can be determined whether or not clogging is likely to occur. For example, when the viscosity of the sludge becomes a predetermined value or more, it may be determined that clogging is likely to occur. Further, a pressure sensor is attached to the hole 65 of the perforated annular plate 60, and the pressure of the sludge inside the multiple plate 5 is measured by this pressure sensor, and it is determined whether or not clogging is likely to occur based on the pressure. it can. For example, it may be determined that clogging is likely to occur when the sludge pressure exceeds a predetermined value. When it is determined that clogging is likely to occur based on the detection value of the sensor 55, it is preferable to take measures to avoid clogging. Thereby, clogging can be prevented in advance. The sensor 55 may be a sensor that detects a physical quantity other than pressure and viscosity. For example, the sensor 55 may be a pH meter that detects sludge pH. The pH of the sludge can be used for grasping the appropriate amount of the flocculant. For example, the amount of flocculant added can be adjusted based on the pH of the sludge.

  The above utilization example is an example in which the perforated annular plate 60 is utilized for detection of the state of sludge. On the other hand, the perforated annular plate 60 can also be used for clogging removal or cleaning of the multiple plate 5. As shown in FIG. 10, a supply device 56 that supplies fluid may be attached to the hole 65 of the perforated annular plate 60. The cleaning nozzle 18 (see FIG. 1) disposed outside the multiple plate 5 can only indirectly clean the inside of the multiple plate 5, but supplies fluid from a supply device 56 attached to the hole 65. Thus, the inside of the multiple plate 5 and the screw conveyor 40 can be washed directly, and the clogged sludge can be removed. The fluid supplied by the supply device 56 may be a gas (for example, high-pressure gas) or a liquid. The fluid supplied by the supply device 56 may be, for example, air, water, or a medicine. The supply form of the fluid of the supply device 56 is not limited. For example, the fluid may be ejected or dispersed. The supply device 56 may be a nozzle, for example, a cleaning nozzle that jets high-pressure air or water. The supply device 56 may supply the fluid constantly, intermittently, or only during a specific time.

  By the way, the property of sludge can be changed by supplying a flocculant to sludge. Therefore, the flocculant may be supplied from the hole 65 of the perforated annular plate 60 to the sludge inside the multiple plate 5. Further, the flocculant may be supplied from a supply device 56 (see FIG. 10) attached to the hole 65. Thereby, it becomes possible to mix a flocculant with the sludge currently conveyed to the screw conveyor 40, and clogging can be prevented by changing the property of sludge.

  Other sludge may be introduced from the hole 65 of the perforated annular plate 60. The kind of sludge thrown from the sludge inlet 12a and the sludge thrown from the hole 65 of the perforated annular plate 60 may be the same or different. For example, when there is a first sludge and a second sludge having better water drainage than the first sludge (in other words, easy to dehydrate), the first sludge is introduced from the sludge inlet 12a, The second sludge may be introduced from the hole 65 of the perforated annular plate 60.

  Further, some sludge may be discharged from the hole 65 of the perforated annular plate 60. For example, when cleaning water is supplied to the inner side of the multiple plate 5 to eliminate clogging, the sludge in the supply portion is locally sludge having a high water content. The sludge having a high moisture content in the middle may not become a dehydrated cake even if it reaches the vicinity of the dehydrated cake carry-out port 13a. Therefore, the sludge to which the washing water is supplied on the way may be discharged from the hole 65 of the perforated annular plate 60 so that only the dehydrated cake is carried out from the dehydrated cake carry-out port 13a.

  As described above, a plurality of holes 65 in the perforated annular plate 60 may be provided. Here, the utilization method of each hole 65 may be the same, but may differ. The above usage examples can be combined as appropriate. For example, the sensor 55 may be attached to any one hole 65 and the supply device 56 may be attached to the other hole 65. In this case, based on the detection result of the sensor 55 attached to any one of the holes 65, ON / OFF of the supply device 56 attached to the other hole 65 or the supply amount of the fluid or the flocculant may be controlled. Good.

  A plurality of perforated annular plates 60 may be provided. For example, as shown in FIG. 11, the perforated annular plate 60 may be arranged on the one end 41a side and the other end 41b side from the intermediate position 20c. Although illustration is omitted, it is also possible to arrange two or more perforated annular plates 60 closer to the other end 41b than the intermediate position 20c. For example, the sensor 55 may be attached to the hole 65 of any one of the perforated annular plates 60 and the supply device 56 may be attached to the hole 65 of the other perforated annular plate 60. In this case, based on the detection result of the sensor 55 attached to the hole 65 of any one of the perforated annular plates 60, ON / OFF of the supply device 56 attached to the hole 65 of the other perforated annular plate 60 or The supply amount of the fluid or the flocculant may be controlled.

  As shown in FIG. 12, it is also possible to arrange the perforated annular plate 60 between the wall 11b of the dewatering tank 11 and the annular plate 20b. Although not shown, the perforated annular plate 60 can be disposed between the wall 11a of the dewatering tank 11 and the annular plate 20a. The wall 11a and the wall 11b are wall members that are arranged on one side of the multiple plate 5 in the axial direction and in which holes are formed. A screw conveyor 40 is inserted through the holes in the walls 11a and 11b. The annular plate 20 a is an annular plate facing the wall 11 a of the first annular plate 20 and the second annular plate 30, and the annular plate 20 b is opposed to the wall 11 b of the first annular plate 20 and the second annular plate 30. An annular plate. A perforated annular plate 60 between the annular plate 20b and the wall 11b and / or between the annular plate 20a and the wall 11a and between any two of the first annular plate 20 and the second annular plate 30. Can also be arranged.

  The ON / OFF of the supply device 56 or the control of the supply amount of the fluid or the flocculant may be performed manually, or may be automated. For example, a timer for measuring the operation time may be provided, and ON / OFF of the supply device 56 may be controlled based on the operation time measured by the timer. Further, the supply device 56 may be automatically turned on when the operation of the sludge dehydrator 1 is stopped. For example, as shown in FIG. 13, the sludge dewatering machine 1 may include a control device 57 that receives a signal from the sensor 55 and controls the supply device 56. For example, the control device 57 may turn on the supply device 56 when the detection value of the sensor 55 becomes a predetermined value or more, or may increase the supply amount of the supply device 56 as the detection value of the sensor 55 increases. For example, when a pressure sensor is used as the sensor 55 and a cleaning nozzle that jets water is used as the supply device 56, the control device 57 may turn on the cleaning nozzle when the pressure detected by the pressure sensor exceeds a predetermined value. In addition, as the pressure detected by the pressure sensor increases, the amount of spray of the cleaning nozzle may be increased. Similarly, when a viscosity sensor is used as the sensor 55 and a cleaning nozzle that jets water is used as the supply device 56, the control device 57 may turn on the cleaning nozzle when the viscosity detected by the viscosity sensor becomes equal to or higher than a predetermined value. In addition, as the viscosity detected by the viscosity sensor increases, the ejection amount of the cleaning nozzle may be increased. The same control can be performed when another sensor is used or when another fluid or a flocculant is supplied as the supply device 56. Such control can automatically prevent clogging of sludge.

  As shown in FIG. 14, the control device 57 may be configured to control the motor 50 in response to a signal from the sensor 55. When the rotational speed of the motor 50 is increased, the rotational speed of the screw conveyor 40 is increased, so that clogging can be prevented. For example, the control device 57 may increase the rotation speed of the motor 50 when the detection value of the sensor 55 becomes a predetermined value or more, and may increase the rotation speed of the motor 50 as the detection value of the sensor 55 increases. Good. For example, when a pressure sensor is used as the sensor 55, the control device 57 may increase the rotational speed of the motor 50 when the pressure detected by the pressure sensor reaches a predetermined value or more, and the pressure detected by the pressure sensor. The rotational speed of the motor 50 may be increased as the value increases. Similarly, when a viscosity sensor is used as the sensor 55, the control device 57 may increase the rotation speed of the motor 50 when the viscosity detected by the viscosity sensor is equal to or higher than a predetermined value, and is detected by the viscosity sensor. The rotational speed of the motor 50 may be increased as the viscosity increases. Similar control can be performed when other sensors are used. Such control can also automatically prevent clogging of sludge.

  As described above, according to the present embodiment, by providing the perforated annular plate 60, the inner and outer sides of the multiple plate 5 can be operated during operation while maintaining the original function of the multiple plate type screw press sludge dewatering machine 1. Can be communicated. Therefore, it is possible to detect the state of sludge inside the multiple plate 5. Moreover, it becomes possible to wash | clean the inner side of the multiplex board 5, and the screw conveyor 40 directly. Therefore, removal or prevention of sludge clogging can be suitably performed.

  Although the perforated annular plate 60 may be an integral member, in the present embodiment, as shown in FIG. 5, the perforated annular plate 60 includes a first member 61 and a second member 62 each having an arc shape assembled by a bolt 63. The first member 61 and the second member 62 can be easily assembled around the screw conveyor 40. Therefore, the perforated annular plate 60 can be installed without extracting the screw conveyor 40 from the multiple plate 5, and the perforated annular plate 60 can be easily installed. For example, by extracting a part of the first annular plate and the second annular plate from the existing multi-plate screw press sludge dewatering machine and installing the perforated annular plate 60 in the vacant space, the perforated annular plate 60 Can be retrofitted. According to the perforated annular plate 60 according to the present embodiment, such retrofitting is easy. Further, the perforated annular plate 60 may be removed in order to clean the perforated annular plate 60 itself and replace the sensor 55 or the supply device 56 attached to the hole 65. According to the perforated annular plate 60 according to the present embodiment, the first member 61 and the second member 62 can be separated around the screw conveyor 40, so that the screw conveyor 40 does not have to be extracted from the multiple plate 5. The perforated annular plate 60 can be easily removed.

  As shown in FIG. 9, by attaching a sensor 55 that detects the state of sludge to the hole 65 of the perforated annular plate 60, the state of sludge inside the multiple plate 5 can be detected. Therefore, it is possible to remove or prevent sludge clogging based on the detected state of sludge.

  When the sensor 55 is a pressure sensor, it is possible to detect the pressure of sludge inside the multiple plate 5. Thereby, removal or prevention of clogging of sludge can be performed based on the sludge pressure. Further, when the sensor 55 is a viscosity sensor, it is possible to detect the viscosity of the sludge inside the multiple plate 5. Thereby, removal or prevention of clogging of sludge can be performed based on the viscosity of sludge.

  As shown in FIG. 14, if a control device 57 for controlling the rotational speed of the screw conveyor 40 based on the detection value of the sensor 55 is provided, the rotational speed of the screw conveyor 40 is automatically adjusted according to the state of sludge. Can be adjusted. Thereby, clogging of sludge can be automatically removed or prevented.

  As shown in FIG. 10, by attaching a supply device 56 that supplies fluid to the hole 65 of the perforated annular plate 60, the inside of the multiple plate 5 and the screw conveyor 40 are directly cleaned by the fluid supplied by the supply device 56. Can do. When the supply device 56 is a nozzle that ejects fluid, the inside of the multiple plate 5 and the screw conveyor 40 can be washed directly with fluid (for example, water, air, etc.) ejected from the nozzle. Thereby, removal or prevention of clogging of sludge can be performed suitably.

  By attaching the supply device 56 for supplying the flocculant to the hole 65 of the perforated annular plate 60, the flocculant can be mixed with the sludge inside the multiple plate 5. Therefore, the property of sludge can be changed inside the multiple plate 5. Thereby, clogging of sludge can be prevented appropriately.

  As shown in FIG. 1, according to the present embodiment, the screw conveyor 40 is configured to carry sludge from one end 41a of the shaft portion 41 to the other end 41b, and the perforated annular plate 60 includes the first annular plate 20 and The second annular plate 30 is disposed closer to the other end 41b than an intermediate position 20c between the annular plate 20a located closest to the one end 41a and the annular plate 20b located closest to the other end 41b. As a result, the perforated annular plate 60 can be disposed at a position where sludge is more likely to be clogged, and the sludge state can be detected or the multiple plates 5 can be washed at a portion where sludge is likely to clog.

  If a plurality of holes 65 are formed in the perforated annular plate 60, one perforated annular plate 60 can be used for a plurality of applications. Therefore, the convenience of the perforated annular plate 60 can be enhanced.

  As shown in FIG. 13, if a control device 57 that controls the supply device 56 based on the detection value of the sensor 55 is provided, the supply device 56 is controlled according to the state of sludge detected by the sensor 55. Can do. Thereby, clogging of sludge can be automatically prevented or removed.

  As mentioned above, although several embodiment of this invention has been described, the above-mentioned embodiment is a mere illustration, and of course, this invention is not limited to the above-mentioned embodiment.

  In the above-described embodiment, the hole 65 of the perforated annular plate 60 is a hole whose entire circumference is closed, but the hole 65 may be a hole opened in the axial direction of the perforated annular plate 60. Since the perforated annular plate 60 is sandwiched between the first annular plate 20 or the second annular plate 30, even in such a hole, the perforated annular plate 60 is sandwiched between the first annular plate 20 or the second annular plate 30. In the closed state, the entire circumference becomes a closed hole. As described above, the perforated annular plate 60 is an annular plate having at least one hole 65 communicating between the inside and the outside in the radial direction, and the term “annular” as used herein simply means a shape that goes around the center. However, the one-round shape referred to here is a one-round shape including the hole 65. Therefore, the hole 65 is not limited to the hole surrounded by the entire periphery, and may be a hole opened in the axial direction. For example, a slit (= hole) extending in the radial direction may be formed in the perforated annular plate 60, and a sensor or the like may be fitted into the slit.

  In the above embodiment, the object to be dehydrated is sludge, but the object to be dehydrated in the multi-plate screw press dehydrator according to the present invention is not limited to sludge.

DESCRIPTION OF SYMBOLS 1 Multiple plate type screw press sludge dehydrator 5 Multiple plate 20 1st annular plate 30 2nd annular plate 40 Screw conveyor 41 Shaft part 42 Blade | wing part 50 Motor (drive device)
60 perforated annular plate 65 holes

Claims (13)

A plurality of first annular plates arranged in an axial direction at intervals from each other;
A plurality of second annular plates, each disposed between the first annular plates, having an inner diameter smaller than an inner diameter of the first annular plate and having an outer diameter smaller than the outer diameter of the first annular plate;
A blade portion that is disposed in a space inside the first annular plate and the second annular plate so as to penetrate the first annular plate and the second annular plate, and extends in a spiral manner around the shaft portion; A screw conveyor having
A drive device for rotating the screw conveyor,
A multi-plate screw press dehydrator that performs an eccentric rotational movement between the first annular plates by being pushed by the blades with the rotation of the screw conveyor,
A multi-plate type in which a perforated annular plate in which a hole communicating in the radial direction is formed is disposed between any two of the plurality of first annular plates and the plurality of second annular plates. Screw press dehydrator. A plurality of first annular plates arranged in an axial direction at intervals from each other;
A plurality of second annular plates, each disposed between the first annular plates, having an inner diameter smaller than an inner diameter of the first annular plate and having an outer diameter smaller than the outer diameter of the first annular plate;
A wall member disposed in one of the first annular plate and the second annular plate in the axial direction, and having a hole;
The wall member is inserted into the hole, and is disposed in a space inside the first annular plate and the second annular plate so as to penetrate the first annular plate and the second annular plate. A screw conveyor having a blade portion extending spirally around the shaft portion;
A drive device for rotating the screw conveyor,
A multi-plate screw press dehydrator that performs an eccentric rotational movement between the first annular plates by being pushed by the blades with the rotation of the screw conveyor,
Between the first annular plate and the second annular plate, an annular plate facing the wall member and the wall member, a perforated annular plate in which a hole communicating in the radial direction is formed. Multi-plate screw press dehydrator.   The perforated annular plate includes an arc-shaped first member, an arc-shaped second member, and a coupler that detachably couples the first member and the second member. Or the multiple plate type screw press dehydrator of 2.   The screw press dehydrator according to any one of claims 1 to 3, further comprising a sensor that is attached to the hole of the perforated annular plate and detects a state of an object to be dewatered that is carried to the screw conveyor.   The screw press dehydrator according to claim 4, wherein the sensor is a pressure sensor.   The screw press dehydrator according to claim 4, wherein the sensor is a viscosity sensor.   The screw press dehydrator as described in any one of Claims 4-6 provided with the control apparatus which controls the rotational speed of the said screw conveyor based on the detected value of the said sensor.   4. The apparatus according to claim 1, further comprising a supply device that is attached to the hole of the perforated annular plate and supplies fluid to a space inside the first annular plate and the second annular plate. The screw press dehydrator as described.   The screw press dehydrator according to claim 8, wherein the supply device is a nozzle that ejects fluid. The object to be dewatered carried by the screw conveyor is sludge,
4. The apparatus according to claim 1, further comprising a supply device that is attached to the hole of the perforated annular plate and that supplies a flocculant to a space inside the first annular plate and the second annular plate. A screw press dehydrator as described in 1. The screw conveyor is configured to carry an object to be dehydrated from one end of the shaft portion to the other end,
The perforated annular plate is different from the intermediate position between the annular plate located closest to the one end and the annular plate located closest to the other end of the first annular plate and the second annular plate. The screw press dehydrator according to any one of claims 1 to 10, which is arranged on an end side.   The multi-plate screw press dehydrator according to any one of claims 1 to 11, wherein a plurality of the holes are formed in the perforated annular plate. A plurality of the holes are formed in the perforated annular plate, or a plurality of the perforated annular plates are arranged,
A sensor that is attached to at least one hole and detects the state of a dehydration object to be carried to the screw conveyor;
A supply device attached to at least one other hole and configured to supply fluid to a space inside the first annular plate and the second annular plate;
A control device for controlling the supply device based on a detection value of the sensor;
The multi-plate screw press dehydrator according to claim 1, comprising:

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