JP6673769B2 - Disk screen device and operation method - Google Patents

Description

  The present invention relates to a disk screen device for removing impurities and the like in wastewater and an operation method thereof.

  2. Description of the Related Art As a dust removing device for removing impurities and the like in waste water, there is a disk screen device. A general disk screen device includes a rotary disk screen formed by arranging a plurality of rings in parallel, and captures impurities in drainage. The disc screen device is provided with a cleaning device for removing foreign substances adhering to the disc screen, thereby enabling continuous operation. The disc screen is also called a drum screen or a rotating screen, and the disc screen device is also called a drum screen device.

  Various cleaning devices for removing contaminants attached to the disc screen have been developed, for example, a cleaning device including a transfer roller and a scraper disposed downstream of the drum screen, and a cleaning device disposed downstream of the drum screen. There is a cleaning device including a dust removing roller and a water or air jet nozzle for removing impurities attached to the dust removing roller (for example, see Patent Documents 1 and 2).

  There is also a cleaning device that includes a rotary scraper and a fixed scraper, and removes foreign substances sandwiched between the rotary scraper and the fixed scraper by rotating the rotary scraper in a reverse direction after the drum screen stops (for example, Patent Document 1). 3). Note that the transfer roller, the dust removing roller, and the rotating scraper have the same meaning.

JP-A-11-57333 Japanese Utility Model Application Publication No. 4-52262 JP-A-8-199538

  The cleaning device provided in the drum screen device described in Patent Document 1 or Patent Document 3 described above arranges a rotary scraper that meshes with the drum screen on the downstream side of the drum screen, and rotates the rotary screen in the same direction as the drum screen. In addition, the foreign substances adhering to the drum screen are transferred to a rotary scraper, and the foreign substances adhering to the rotary scraper are scraped off by a fixed scraper.

  The above-mentioned cleaning device is relatively successful in transferring foreign substances from the drum screen to the rotary scraper, but the removal of the foreign substances from the rotary scraper is not enough, and the rotary scraper and the fixed scraper can be removed within a relatively short period of time. Impurities accumulate in the meshing portion of the. For this reason, it is necessary to stop the operation periodically and remove impurities entangled in the fixed scraper with a tool such as a rake, and improvement is required.

  SUMMARY OF THE INVENTION It is an object of the present invention to provide a disk screen device and a method of operating the disk screen device that can solve the problem of deposits of contaminants on a meshing portion observed in a conventional cleaning device and that can be operated for a long period of time. .

  The present invention includes a disk screen formed by arranging a plurality of disks at predetermined intervals, rotating and removing impurities in the processing liquid, and a cleaning device that removes the impurities attached to the disk screen. The cleaning device has n (n is an integer of 2 or more) rotating scrapers, each rotating scraper sequentially meshing with each other, and the first rotating scraper meshing with the disk screen, and The scraper removes the contaminants from the disc screen, another rotating scraper sequentially removes the contaminants, and drops the contaminants from a meshing portion between the (n-1) th rotation scraper and the nth rotation scraper. A disk screen device characterized by the following.

  In the disk screen device of the present invention, the rotating scraper is capable of normal rotation, reverse rotation, and stop, and at least the nth rotation scraper is capable of normal rotation, reverse rotation, and stop independently of the (n-1) th rotation scraper. It is characterized by the following.

  Further, in the disk screen device of the present invention, at least the n-th rotating scraper is rotatable at a different speed from the (n-1) -th rotating scraper.

  Further, in the disk screen device of the present invention, at least the n-th rotating scraper is installed at a lower position than the (n-1) -th rotating scraper, and passes through the center point of the rotating shaft of the (n-1) -th rotating scraper. The vertical line and the vertical line passing through the center point of the rotation axis of the n-th rotation scraper are on the same vertical line, or the n-th rotation scraper with respect to the vertical line passing through the center point of the rotation axis of the (n-1) -th rotation scraper. A vertical line passing through the center point of the rotation axis of the disk is closer to the disk screen.

  Further, the disc screen device of the present invention is characterized in that the n rotating scrapers have the same shape and the same dimensions.

  Further, the disc screen device of the present invention further includes an operation control device for controlling operations of the disc screen and the cleaning device, and the operation control device operates the disc screen and the cleaning device according to a predetermined procedure, and performs processing. It is characterized in that a contaminant removing operation for removing contaminants in the liquid and a cleaning operation for removing contaminants entangled in the rotary scraper are performed.

The present invention is also an operation method of the disk screen device, wherein in the foreign matter removing operation step of removing foreign matter in the processing liquid, only the first step defined below is executed, or the first step defined below is performed. A method for operating a disk screen device, characterized in that a step and a second step are alternately performed to remove impurities in a processing liquid.
First step: the disk screen and the first to (n-1) th rotating scrapers continuously rotate forward, and the n-th rotating scraper stops.
Second step: the disk screen and the first to (n-1) th rotation scrapers rotate continuously and the n-th rotation scraper rotates normally.

  The present invention is also an operation method of the disc screen device, comprising a cleaning operation step of removing foreign substances entangled in the rotating scraper, and in the cleaning operation step, the disc screen and / or any one or more A disk screen device characterized in that the rotary scraper is rotated forward, or reversely, or stopped, or slightly rotated, or slightly reversed, and furthermore, these operations are combined to remove foreign substances entangled in the rotary scraper. It is a driving method.

  In the disk screen device of the present invention, the cleaning device for cleaning the disk screen is composed of n (n is an integer of 2 or more) rotating scrapers, and therefore, unlike the conventional cleaning device, all the scrapers are moved ( Can be rotated). Therefore, by appropriately setting the rotation speed difference and the rotation direction between the (n-1) th rotation scraper and the n-th rotation scraper forming the meshing portion for dropping the foreign matter, it is possible to prevent the foreign material from being deposited on the meshing portion. be able to. Further, even when foreign matter is deposited on the meshing portion, the foreign matter deposited by performing a so-called cleaning operation in which the rotation speed difference between the (n-1) th rotation scraper and the n-th rotation scraper and the rotation direction are changed, Can be removed.

  In particular, the n-th rotating scraper forming the meshing portion for dropping impurities can be rotated forward, backward, and stopped independently of the (n-1) -th rotating scraper, and further rotated at a different speed from the (n-1) -th rotating scraper. If possible, it is possible to more reliably prevent the deposition of foreign substances on the meshing portion and more reliably remove the deposited foreign substances. In addition, an operation according to the processing speed of the processing liquid, the amount of impurities, and the like can be performed.

  In the cleaning device, in order to prevent foreign substances from accumulating on the meshing portion, it is important that the foreign matters scraped off by the meshing portion be separated from the meshing portion as soon as possible. Since detachment of the contaminants from the meshing portion is based on free fall, it is preferable that the direction of the meshing portion is set to a direction in which the contaminants easily fall as much as possible. In the disk screen device of the present invention, since the cleaning device is composed of two or more rotary scrapers, the degree of freedom of the arrangement of the engaging portion is high, and the direction of the engaging portion may be set to a direction in which the foreign matter easily falls. it can.

  The n rotating scrapers constituting the cleaning device do not have to have the same shape and the same size.However, if all the n rotating scrapers have the same shape and the same size, the manufacturing cost can be reduced, and inventory control can be performed. It is easy and preferable.

  In addition, since the disk screen device of the present invention includes the operation control device, the procedure of the impurity removal operation and the cleaning operation of the rotary scraper is programmed and stored, so that the impurity removal operation and the cleaning operation can be automated. .

  In addition, by using the operation method of the disk screen device of the present invention, it is possible to efficiently remove foreign substances in the processing liquid and remove foreign substances entangled in the rotary scraper.

  As described above, the disc screen device and the method of operating the disc screen device of the present invention prevent the accumulation of impurities in the cleaning device for cleaning the disc screen, or even when the impurities are accumulated in the cleaning device. By performing the cleaning operation, the deposits can be removed without manual operation, so that long-term operation is possible.

1 is a perspective view of a disc screen device 1 according to a first embodiment of the present invention. FIG. 1 is a configuration diagram of a disc screen device 1 as a first embodiment of the present invention. FIG. 2 is a configuration diagram of a cleaning device 31 of the disc screen device 1 of FIG. 1. FIG. 2 is a diagram illustrating a meshing state of a disk screen 21 and a rotary scraper of the disk screen device 1 of FIG. 1. FIG. 2 is a layout view of a rotary scraper constituting a cleaning device 31 of the disc screen device 1 of FIG. 1. 2 is a flowchart showing an operation procedure of the disc screen device 1 of FIG. FIG. 4 is a layout view of a rotary scraper of a cleaning device 32 which is a modified example of the cleaning device 31 of the disc screen device 1 of FIG. 1.

  FIG. 1 is a perspective view of a disc screen device 1 according to a first embodiment of the present invention. FIG. 2 is a configuration diagram of the disc screen device 1, and FIG. 3 is a configuration diagram of the cleaning device 31 of the disc screen device 1. FIG. 4 is a diagram showing a meshing state of the disk screen 21 and the rotary scraper of the disk screen device 1, and FIG. 5 is a layout diagram of a rotary scraper constituting the cleaning device 31 of the disk screen device 1.

  The disc screen device 1 is a device that continuously receives sewage, drainage, waste liquid, and the like, removes impurities such as flocs and scum contained therein, and discharges sewage and the like from which the impurities have been removed. A disk screen 21, a casing 11 for supporting the disk screen 21, a cleaning device 31 for cleaning the disk screen 21, a disk screen 21, a driving device 51 for driving the cleaning device 31, and an operation control device 61 are provided. Hereinafter, each component will be described in detail using the treatment liquid as wastewater.

  The casing 11 has a rectangular shape capable of storing the disk screen 21. A drainage inlet 13 for receiving drainage and a filtrate outlet 14 for discharging a filtrate from which impurities have been removed are provided on one side surface of the casing 11. In the casing 11, an inflow tank 15 for guiding the wastewater flowing from the wastewater inlet 13 to the disk screen 21 and an outflow tank 16 for guiding the filtrate from which impurities are removed by the disk screen 21 to the filtrate outlet 14 are provided. ing.

  The inflow tank 15 is provided with a water level control tank (not shown) communicating with the inflow tank 15, and the water level control tank is provided with a level gauge 17 for detecting the water level. The water level of the inflow tank 15 can be detected via the level meter 17, and the level meter 17 is connected to the operation control device 61 and transmits a signal to the operation control device 61.

  The disk screen 21 is a cylindrical rotating screen, and captures and removes impurities in the wastewater sent from the inflow tank 15. The disk screen 21 is formed by arranging a plurality of ring-shaped disks 22 at a predetermined interval and fixing the disk 22 to a support 24 provided at the tip of an arm 23 to form a screen. A boss 25 through which a rotation shaft 26 is inserted is provided at a base end of the arm 23, and the boss 25 is fixed to the rotation shaft 26. The disk screen 21 is supported by bearings 27 at both ends of a rotating shaft 26, is rotatably mounted on the casing 11, and is mounted so as to face an end of the inflow tank 15.

  The cleaning device 31 is a device that removes foreign substances adhering to the disk screen 21 and includes a plurality of rotating scrapers. These are provided on the downstream side of the disk screen 21. The downstream side of the disk screen 21 is opposite to the inflow tank 15. The cleaning device 31 is a characteristic part of the disc screen device 1, and details of the structure and the like will be described later.

  The drive device 51 is a device that rotates the disk screen 21, and includes a drive motor 52 having a transmission, a power transmission mechanism 53 configured to transmit the rotation of the drive motor 52 to the disk screen 21 and configured by gears, chains, and the like. It consists of. The drive motor 52 is mounted on the upper part of the casing 11 and is connected to the disc screen 21 via a power transmission mechanism 53.

  The operation control device 61 includes a controller such as a programmable controller and controls the operation of the disk screen device 1 in accordance with a predetermined procedure in cooperation with the level meter 17. Specifically, based on a programmed procedure, the operations of the disk screen 21 and the cleaning device 31 are controlled to remove foreign substances in the processing liquid, and a foreign substance removal operation for removing foreign substances entangled in the rotary scraper. Perform cleaning operation.

  In the disk screen device 1 having the above configuration, the waste water is continuously received, the disk screen 21 is rotated via the drive device 51, and the foreign matter in the waste water is captured by the disk screen 21, and the foreign matter is removed. The configuration, structure, shape, arrangement, and the like of the casing 11, the disk screen 21, and the driving device 51 may be other than the above as long as the basic configuration of discharging the wastewater is maintained. The operation control device 61 may not be provided. Except for the cleaning device 31 and the accompanying driving device, it can be used for a wide range of disc screen devices.

  Next, the cleaning device 31 that removes foreign substances adhering to the disk screen 21, which is a characteristic part of the present disk screen device 1, will be described in detail.

  The cleaning device 31 includes three rotating scrapers from first to third, and removes and discharges foreign substances attached to the disk screen 21. In the cleaning device 31, the first to third rotating scrapers have the same shape and the same dimensions. The first rotating scraper 33, the second rotating scraper 41, and the third rotating scraper 42 are not limited to those having the same shape and the same dimension. , Inventory management becomes easy. Here, the same shape and the same dimension include those which can be regarded as substantially the same shape and the same size, such as a case where the number of disks constituting the rotary scraper is different from one or two. Hereinafter, the configuration and structure of the rotary scraper will be described using the first rotary scraper 33.

  The first rotary scraper 33 has a shape in which comb teeth 35 are formed on the outer peripheral surface of a columnar member having a rotary shaft 34 arranged at the center. The comb teeth 35 are provided so as to mesh with all the screens of the disk screen 21. Specifically, the first rotary scraper 33 includes disks 36 forming teeth and spacers 37 having a smaller diameter than the disk 36 are alternately arranged in the same number as the number of screens of the disk screen 21, and side plates 38 are provided on both sides. Are arranged, and these are fixed by tension bolts (not shown) to form comb teeth 35.

The diameter d _{1 of the} disk 36 is smaller than the diameter D of the disk screen 21, and the thickness t ₁ of _one disk 36 is set slightly smaller than the screen width T of the disk screen 21. The length L ₁ of the comb teeth 35 is set to be slightly longer than the width L of the disc 22 of the disc screen 21. The length L ₁ of the comb teeth 35 is の of the value obtained by subtracting the diameter d _{2 of the} spacer 37 from the diameter d _{1 of the} disk 36.

  A through hole (not shown) is provided in the center of the disk 36, the spacer 37, and the side plate 38, and the rotating shaft 34 is inserted and fixed in the through hole. A detent is provided between the rotating shaft 34 and the disk 36 and the like, and the rotating shaft 34 and the disk 36 and the like rotate integrally.

  The first rotary scraper 33 configured as described above is rotatably fixed to the casing 11 via the bearing 39 so that the comb teeth 35 mesh with the screen of the disk screen 21 as shown in FIG. The state where the comb teeth 35 mesh with the screen of the disk screen 21 means a state where the comb teeth 35 are fitted with a slight gap to the screen eyes.

  The second rotary scraper 41 and the third rotary scraper 42 also have the same structure as the first rotary scraper 33. As shown in FIG. 3 or FIG. 4, the second rotary scraper 41 includes the first rotary scraper 33 and the third rotary scraper 33. Reference numeral 42 is rotatably fixed to the casing 11 via bearings 43 and 44 so as to mesh with the second rotary scraper 41, respectively.

  Gears are attached to the rotating shafts 34 and 45 of the first rotating scraper 33 and the second rotating scraper 41, and connected to a driving motor 52 via a chain to rotate. The third rotating scraper 42 is connected to another drive motor (not shown) via a connecting tool (not shown). In the cleaning device 31 of the present embodiment, the first rotating scraper 33 and the second rotating scraper 41 move in conjunction with the disk screen 21, and the third rotating scraper 42 moves with the first rotating scraper 33 and the second rotating scraper 41. Are configured to be independently capable of normal rotation, reverse rotation, and stop.

Next, functions, roles and arrangements of the first rotating scraper 33, the second rotating scraper 41, and the third rotating scraper 42 will be described. In FIG. 5, H is the axial center of the horizontal direction of the height of the disc screen _21, H _1, H 2, _{H 3,} the first rotating scraper 33, respectively, second rotary scraper 41, the third rotating scraper 42 axis horizontal height of the _heart, V _1, V 2, _{V 3,} the first rotating scraper 33, respectively, second rotary scraper 41, shows a vertical axis of the third rotating scraper 42.

  In the cleaning device 31, the first rotating scraper 33 engages with the disk screen 21, scrapes off the foreign substances attached to the disk screen 21, further removes the foreign substances with the second rotating scraper 41, and removes the second rotary scraper 41 and the third rotating scraper 41. Impurities are dropped and discharged from a portion 48 meshed with the rotary scraper 42.

  In the cleaning device 31 performing the above operation, the first rotating scraper 33 efficiently removes foreign matter from the disk screen 21, and the second rotating scraper 41 efficiently removes foreign matter from the first rotating scraper 33, Further, it is desirable that the second and third rotating scrapers 41 and 42 are arranged so that the foreign substances can be reliably dropped and discharged.

  In order to efficiently remove impurities from the disc screen 21, the first rotary scraper 33 is preferably installed downstream of the disc screen 21. Regarding the installation height of the first rotary scraper 33, the lower the position, the easier it is for the direction A (see FIG. 5) of the engagement portion 48 to be downward. On the other hand, if the first rotary scraper 33 is installed lower than the disk screen 21, the separated water easily overflows from the cleaning device 31. From these facts, it is preferable that the installation height of the first rotary scraper 33 is equal to or slightly lower than the installation height of the disc screen 21. Here, the installation height refers to the horizontal height of the axis of the rotating shaft.

  The second rotating scraper 41 and the third rotating scraper 42 are preferably arranged so that the direction A of the engaging portion 48 is as low as possible (vertically downward). If the meshing portion 48 is directed downward, foreign substances are likely to fall. The direction A of the meshing portion 48 refers to a direction that divides the meshing portion 48 into two parts with the center of the meshing portion 48 as a starting point (see FIG. 5). In order to direct the direction A of the engagement portion 48 directly downward, it is necessary to horizontally arrange the third rotating scraper 42 with respect to the second rotating scraper 41 on the disk screen 21 side. 42 is impossible because it contacts the disk screen 21 or the first rotating scraper 33.

From the above, the second rotating scraper 41 is disposed on the opposite side of the first rotating scraper 33 from the disk screen 21 and obliquely downward by about 45 °, and the third rotating scraper 42 is On the other hand, it is preferable to dispose it obliquely downward at about 45 ° on the disk screen 21 side (see FIG. 5). This positional relationship is such that the third rotary scraper 42 is installed at a lower position than the second rotary scraper 41, and a vertical line V ₃ passing through the center point of the rotary shaft 46 of the third rotary scraper 42 is formed by the second rotary scraper 41. the disc screen 21 closer with respect to the vertical line V ₂ passing through the center point of the rotation axis 45 of the.

  With such an arrangement, the third rotary scraper 42 is located almost directly below the first rotary scraper 33, and the direction A of the engagement portion 48 is approximately 45 °. At this time, as shown in FIG. 5, the third rotary scraper 42 is substantially vertical below the engagement portion 48, so that foreign substances are hardly caught by the third rotary scraper 42 and easily fall.

  Next, the basic operation of the disk screen device 1 will be described. FIG. 6 is a flowchart showing the operation procedure of the disk screen device 1. In the following operation, an operation procedure is installed in the operation control device 61, and the operation control device 61 controls each operation to execute the operation. First, the operation pattern 1 will be described.

  The operation control device 61 detects whether or not the inflow tank 15 is at or above a predetermined water level (step S1). The water level in the inflow tank 15 is determined based on a signal from a level gauge 17 installed in a water level control tank communicating with the inflow tank 15.

  When a pump (not shown) for supplying drainage to the disk screen device 1 is activated and a predetermined amount of drainage is being supplied to the disk screen device 1, the inflow tank 15 is at or above a predetermined water level. Conversely, if the pump for supplying the drainage to the disc screen device 1 is stopped and the drainage is not being supplied to the disc screen device 1, the inflow tank 15 will be below the predetermined water level. When the inflow tank 15 is lower than the predetermined water level, the disk screen 21 and the cleaning device 31 are stopped even when the main power of the disk screen device 1 is turned on, and are in a standby state.

  When detecting that the inflow tank 15 is at or above the predetermined water level in step S1, the operation control device 61 operates the disk screen 21 and the cleaning device 31 to remove the foreign substances in the wastewater (the normal operation). ) (Step S2). Specifically, the disk screen 21 is rotated at a constant speed in the forward direction. The cleaning device 31 rotates the first rotary scraper 33 in the forward direction at a speed of about 1.2 times the peripheral speed of the disk screen 21, and the second rotary scraper 41 also rotates in the forward direction at the same speed as the first rotary scraper 33 or Rotate at a slightly faster speed. The third rotating scraper 42 is stopped. In the present embodiment, the forward direction refers to a counterclockwise rotation.

  During the foreign matter removal operation, the continuously supplied wastewater is guided to the disk screen 21 via the inflow tank 15, where the foreign matter in the wastewater is captured by the disk screen 21 and the foreign matter is removed. The wastewater falls to the outflow tank 16 and is discharged from the filtrate outlet 14.

  The contaminants captured by the disk screen 21 move toward the cleaning device 31 as the disk screen 21 rotates, and are scraped by the first rotating scraper 33. The foreign matter moved to the first rotating scraper 33 is further scraped off by the second rotating scraper 41 and moves to the third rotating scraper 42 side. Since the third rotary scraper 42 is in a stopped state unlike the other rotary scrapers 42, the contaminants separate and drop at the engagement portion 48.

  Although the cleaning device 31 has a structure in which impurities are more likely to fall than a conventional cleaning device, there is a possibility that the impurities may be entangled and accumulated in the meshing portion 48 with long-term operation. For this reason, after performing the impurity removing operation for a preset time, for example, one hour, the following cleaning operation is performed to clean the meshing portion 48.

  The cleaning operation is performed in a state where the supply of drainage to the disc screen device 1 is stopped. After the impurity removing operation has been performed for a preset time, the pump for supplying drainage to the disc screen device 1 is stopped. Thereby, the water level of the inflow tank 15 decreases. When detecting that the inflow tank 15 is below the predetermined water level (step S3), the operation control device 61 controls the operations of the disk screen 21 and the cleaning device 31 as follows, and performs a cleaning operation (step S4). .

  First, the disc screen 21, the first rotating scraper 33, and the second rotating scraper 41 are rotated forward (forward) by one or more rotations. Thus, the foreign substances captured by the disk screen 21 are wiped out. Next, with the disc screen 21, the first rotating scraper 33, and the second rotating scraper 41 stopped, the third rotating scraper 42 is rotated in the normal direction. The term “direct rotation” refers to rotation in the forward direction for an extremely short time, for example, about 0.1 second. The contaminants entangled with the meshing portion 48 of the second rotating scraper 41 due to the normal rotation are separated from the second rotating scraper 41.

  Next, the disk screen 21 and all the rotary scrapers are reversed for about one second, the disk screen 21 and all the rotary scrapers are rotated forward for about 1.2 seconds, and then the disk screen 21 and all the rotary scrapers are rotated for one second. Then, the disk screen 21 and all the rotating scrapers are normally rotated for about 2 seconds, and the cleaning operation is completed.

  After the cleaning operation is completed, the disk screen 21 and all the rotary scrapers are in a standby state in which they are stopped. When the pump for supplying drainage to the disk screen device 1 is started and the inflow tank 15 reaches a predetermined water level (step S1), the impurity removing operation is executed again (step S2). The operation pattern 1 is a typical operation method, and enables stable removal of impurities.

  Next, operation pattern 2 will be described. The operation procedure of the operation pattern 2 is the same as the operation procedure of the operation pattern 1, but the movements of the disk screen 21 and the respective rotary scrapers during the contaminant removal operation and the cleaning operation are different from the operation pattern 1. Hereinafter, the operation pattern 2 will be described focusing on differences from the operation pattern 1.

  The third rotating scraper 42 is in a stopped state during the foreign matter removing operation of the operation pattern 1, but in the foreign matter removing operation of the operation pattern 2, the disc screen 21, the first rotating scraper 33, and the second rotating scraper 41 are rotated forward. At the same time, the third rotating scraper 42 is rotated at high speed in the forward direction. The rotation speeds of the first rotating scraper 33 and the second rotating scraper 41 are the same as in the operation pattern 1. By rotating the third rotary scraper 42 at high speed in the forward direction, the accumulation of foreign substances on the meshing portion 48 is prevented.

  In the cleaning operation of the operation pattern 2, in a state where the drainage supply to the disc screen device 1 is stopped, first, the disc screen 21, the first rotating scraper 33, and the second rotating scraper 41 are rotated forward by one or more rotations. The foreign substances captured by the screen 21 are wiped out. This is the same as the cleaning operation of operation pattern 1. Subsequently, the disc screen 21 and all the rotary scrapers are slightly reversed to drop impurities deposited on the engagement portion 48. Slight reversal means rotating in a reverse direction (a direction opposite to the forward direction) for a very short time, for example, about 0.1 second. The cleaning operation is completed by the above operation. The operation pattern 2 is an effective method when the third rotating scraper 42 cannot be operated independently, and can be suitably used when there is a restriction on emergency treatment or operation.

  Next, operation pattern 3 will be described. The operation procedure of the operation pattern 3 is the same as the operation procedure of the operation pattern 1, but the movements of the disk screen 21 and each of the rotary scrapers during the contaminant removal operation are different from the operation pattern 1. The cleaning operation procedure of the operation pattern 3 is the same as that of the operation pattern 1. Hereinafter, the operation pattern 3 will be described focusing on differences from the operation pattern 1.

  In the contaminant removal operation of the operation pattern 3, the disk screen 21 and the rotary scraper are operated for about 10 minutes in the same manner as the contaminant removal operation of the operation pattern 1 (first step). After that, the stopped third rotating scraper 42 is rotated in the normal direction for about 0.1 second while the operations of the disk screen 21, the first rotating scraper 33, and the second rotating scraper 41 remain unchanged (second step). After that, the impurity removing operation is performed while the first step and the second step are alternately repeated. With the above operation, the meshing portion 48 between the second rotary scraper 41 and the third rotary scraper 42 can be updated. As a result, the load on the driving device can be reduced. The operation pattern 3 is a development of the operation pattern 1, and enables stable removal of impurities without applying a load to the apparatus and performing a cleaning operation for a long time.

  As described above, the basic operation procedure of the disc screen device 1 has been described using the operation patterns 1 to 3, but the operation procedure of the disc screen device 1 is not limited thereto. The rotation time of the disk screen 21 and / or the rotating scraper shown in the operation patterns 1 to 3 is not restricted. An operation method suitable for drainage properties such as the amount of drainage and the amount of impurities can be adopted.

  As described above, the present disk screen device 1 is different from the conventional cleaning device composed of a rotating scraper and a fixed scraper, in that the cleaning device 31 is entirely composed of a rotating scraper, and in particular, the scraper corresponding to the conventional fixed scraper is rotated. The operation as described above is possible because the scraper (third rotating scraper 42) is used.

  That is, since the third rotary scraper 42 is configured to be rotatable, the third rotary scraper 42 can be rotated by the second rotary scraper 41, and the second rotary scraper 41 can be rotated by the first rotary scraper 33 or the third rotary scraper 42. The second rotating scraper 41 constantly cleans the scraper 33, so that long-term operation is possible.

  Next, a modified example of the cleaning device 31 of the disk screen device 1 according to the first embodiment will be described with reference to FIG. FIG. 7 is a diagram for explaining the arrangement of the rotary scrapers of the cleaning device 32 of the disc screen device 1 according to the first embodiment.

  The cleaning device 32 shares the technical idea with the cleaning device 31, and is formed of a rotary scraper like the cleaning device 31. However, the cleaning device 32 is composed of two rotating scrapers, whereas the cleaning device 31 is composed of three rotating scrapers.

  The cleaning device 32 includes a first rotating scraper 33 and a second rotating scraper 41. The second rotating scraper 41 has the same function as the third rotating scraper 42 of the cleaning device 31. For this reason, in the cleaning device 32, the meshing portion where the foreign matter falls is the meshing portion 48 between the first rotating scraper 33 and the second rotating scraper 41.

  In the cleaning device 32, the installation height of the first rotary scraper 33 is lower than that of the cleaning device 31, and the second rotary scraper 41 is installed almost directly below the first rotary scraper 33. Further, the second rotary scraper 41 of the cleaning device 32 is arranged close to the disk screen 21. This is to make the direction A of the engagement portion 48 as downward as possible. The disc screen device provided with the cleaning device 32 can be operated in the same manner as the disc screen device 1 provided with the cleaning device 31 by using the second rotating scraper 41 as the third rotating scraper 42 of the cleaning device 31.

  The direction A of the meshing portion 48 of the cleaning device 32 is substantially horizontal, and it is difficult for foreign substances to fall as compared with the cleaning device 31. However, like the third rotary scraper 42 of the cleaning device 31, the second rotary scraper 41 is used. Can be rotated, so that it is difficult for foreign matter to accumulate in the meshing portion 48, and even if accumulated, it can be removed by a cleaning operation.

  The cleaning device 32 is composed of two rotating scrapers, so it is inexpensive compared to the cleaning device 31, and does not require a large installation space, so that the disc screen device 1 can be made compact.

  In addition to the cleaning device 32, the cleaning device can be further modified based on the technical concept of the cleaning device 31. For example, the cleaning device may be configured using four or five rotating scrapers. When the cleaning device is configured by using the four rotary scrapers, the fourth rotary scraper functions in the same manner as the third rotary scraper of the cleaning device 31, and contaminants are generated from the engagement portion between the third rotary scraper and the fourth rotary scraper. Drop things. Similarly, when the cleaning device is configured using five rotary scrapers, the fifth rotary scraper functions in the same manner as the third rotary scraper of the cleaning device 31, and the engagement portion between the fourth rotary scraper and the fifth rotary scraper is formed. Drop foreign substances from the

  As can be understood from the above description, when the cleaning device is constituted by n rotating scrapers, the meshing portion between the (n-1) th rotating scraper and the nth rotating scraper may be set as the falling position of the foreign matter. If the number of rotating scrapers of the cleaning device is increased, the direction A of the meshing portion can be set to a direction directly below the vertical direction, and contaminants easily fall. On the other hand, the cost is high and a large installation space is required.

  Further, in the cleaning device 31 of the first embodiment, all the constituent rotary scrapers have the same shape and the same size, but the size of the rotary scraper may be partially changed. For example, if the diameter of the third rotating scraper of the cleaning device 31 is small, the second rotating scraper 41 and the third rotating scraper 42 can be moved toward the disk screen 21 in FIG. It can be just below.

  As described above, various modifications of the cleaning device are conceivable. However, a preferable device may be selected and used as appropriate from the wastewater treatment amount, the amount and type of impurities, the installation space, the production cost, and the like.

  As described above using the modified examples of the disc screen device 1 and the cleaning device of the first embodiment, the disc screen device of the present invention has two or more rotatable rotating devices. Unlike a conventional cleaning device, foreign substances are unlikely to accumulate at the engagement portion because the cleaning device is constituted by a scraper. Further, even when impurities are deposited on the meshing portion, the cleaning operation can remove the deposits without manual operation, so that long-term operation is possible.

  In addition, by using the above-described operation method, it is difficult for foreign substances to accumulate in the meshing portion as compared with the conventional disk screen device, and even when foreign matter is deposited in the meshing portion, the deposit is removed without manual operation. This allows long-term operation.

  Although the preferred disk screen apparatus and the method of operating the same have been described with reference to the drawings, those skilled in the art will readily envisage various changes and modifications within the apparent scope upon reading this specification. . Accordingly, such changes and modifications are to be construed as being within the scope of the invention as defined by the appended claims.

  For example, in the disk screen device of the first embodiment, the same drive motor is used to rotate the disk screen 21 and the first and second rotary scrapers integrally. However, the disk screen 21 and the first and second rotary scrapers may be driven by different drive motors. Good. Further, in the above-described embodiment, the example in which the rotary scrapers having the same shape and the same size are used has been described, but the shape and the size may be different. Further, the manner of forming the rotary scraper is not limited to the above embodiment. In the above embodiment, the contaminant removal operation (normal operation) and the cleaning operation are performed through the operation control device. However, the normal operation and the cleaning operation may be performed without using the operation control device.

Reference Signs List 1 disc screen device 11 casing 15 inflow tank 17 level meter 21 disc screen 22 disc 26 rotating shaft 31 cleaning device 32 cleaning device 33 first rotating scraper 34 rotating shaft 35 comb teeth 41 second rotating scraper 42 third rotating scraper 45 rotating shaft 46 rotating shaft 48 meshing portion 51 drive device 52 drive motor 61 operation control device A direction of meshing portion

Claims (8)

A disk screen formed by arranging a plurality of disks at predetermined intervals, rotating and removing impurities in the processing liquid,
A cleaning device for removing the contaminants attached to the disk screen,
The cleaning device has n (n is an integer of 2 or more) rotating scrapers,
Each rotating scraper is sequentially engaged with each other, and the first rotating scraper is engaged with the disc screen,
The first rotating scraper removes the foreign matter from the disc screen, another rotating scraper sequentially transfers the foreign matter, and removes the foreign matter from a meshing portion between the (n-1) th rotating scraper and the nth rotating scraper. A disc screen device characterized by dropping a disc. The rotating scraper is capable of normal rotation, reverse rotation, and stop,
The disk screen device according to claim 1, wherein at least the n-th rotation scraper can rotate forward, reverse, and stop independently of the (n-1) -th rotation scraper.   3. The disk screen device according to claim 1, wherein at least the n-th rotation scraper is rotatable at a different speed from the (n-1) -th rotation scraper. At least the n-th rotation scraper is installed at a lower position than the (n-1) -th rotation scraper,
The vertical line passing through the center point of the rotation axis of the n-1st rotation scraper and the vertical line passing through the center point of the rotation axis of the nth rotation scraper are on the same vertical line, or the rotation of the n-1th rotation scraper The vertical line passing through the center point of the rotation axis of the n-th rotating scraper is closer to the disc screen than the vertical line passing through the center point of the shaft. Disk screen device.   5. The disk screen device according to claim 1, wherein the n rotating scrapers have the same shape and the same dimensions. Further comprising an operation control device for controlling the operation of the disk screen and the cleaning device,
The operation control device operates the disc screen and the cleaning device in accordance with a predetermined procedure to perform a foreign matter removal operation for removing foreign matter in the processing liquid, and a cleaning operation for removing foreign matter entangled with the rotary scraper. The disc screen device according to claim 1, wherein the disc screen device is executed. An operation method of the disk screen device according to any one of claims 1 to 6,
In the contaminant removal operation process for removing contaminants in the processing liquid, only the first step defined below is performed, or the first step and the second step defined below are alternately performed, and A method for operating a disk screen device, comprising: removing a foreign substance.
First step: the disk screen and the first to (n-1) th rotating scrapers continuously rotate forward, and the n-th rotating scraper stops.
Second step: the disk screen and the first to (n-1) th rotation scrapers rotate continuously and the n-th rotation scraper rotates normally. An operation method of the disk screen device according to any one of claims 1 to 6,
Having a cleaning operation step of removing contaminants entangled in the rotating scraper,
In the cleaning operation step, the disc screen and / or any one or more of the rotating scrapers are rotated forward, reverse, or stopped, or slightly rotated, or slightly reversed, and further, these operations are combined, and the rotating scraper is combined. A method for operating a disc screen device, comprising removing contaminants entangled in a disc.