JP7123763B2 - Screen residue conveying device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a screen residue conveying apparatus for pipe transfer of screen residue removed from sewage in a settling basin facility such as a sewage treatment plant or a pump station.

Sedimentation basin facilities such as sewage treatment plants and pumping stations remove screen residues from sewage. Further, the screen residues removed from the sewage are separated from the settling basin equipment and transferred to the screen residue processing equipment. Conventionally, the screen residue separated by the settling basin equipment has been transported to a storage hopper using a driving device such as a belt conveyor. However, in addition to requiring a large space to install the belt conveyor, there are problems related to the working environment such as the odor from screen residue and scattering of sewage, and problems related to maintenance such as the need for frequent cleaning of the driving device. was there.

For this reason, as a device for cleaning and transporting screen residue, a screen residue transporting device that combines screen residue crushing, cleaning, and pipe transport has been proposed.

For example, in Patent Document 1, a first washing section, a crushing section, and a second washing section are provided in a tank of an integrated structure, and screen residue collected from a sewage treatment plant is put therein to crush and wash the screen residue. A screen residue conveying apparatus (screen residue processing system) is described in which a transfer pump conveys a mixture of crushed screen residue and water after the cleaning process. In addition, Patent Document 1 describes that this screen residue conveying apparatus reliably crushes and cleans the screen residue, hygienically treats the screen residue, and facilitates maintenance of the apparatus.

Japanese Patent Application Laid-Open No. 2001-187399

In a screen residue conveying apparatus that conveys a mixture of crushed screen residue and water by a pump, as in Patent Document 1, the crushed screen residue may float in the tank. Patent Document 1 describes that a non-clogging pump is used as a transfer pump, but in this case, the mixture of screen residue and water can only be transferred to a water level at which the pump can be operated. , the screen residue that floated up is not conveyed and is deposited in the tank. In addition, in order to remove the accumulated screen residue from the tank, it is returned to the settling tank equipment via the drain, but since the screen residue that has been crushed once is returned, it may not be captured by the settling tank equipment. There is a problem that the screen residue removal efficiency of the settling basin equipment is lowered.

SUMMARY OF THE INVENTION An object of the present invention is to provide a screen residue conveying apparatus for conveying a mixture of crushed screen residue and water, which can prevent the screen residue that has surfaced after crushing the screen residue from accumulating in the apparatus. It is to be.

As a result of intensive studies on the above problems, the present inventors have found that by using a pump capable of idle operation as a pump for transferring a mixture of crushed screen residue and water, the pump can be operated until the water level in the apparatus becomes substantially zero. The inventors have found that the apparatus can be operated, and as a result, the deposition of screen residues in the apparatus can be prevented, thereby completing the present invention.
That is, the present invention is the following screen residue conveying apparatus.

A screen residue conveying apparatus of the present invention for solving the above problems is provided with a crushing section for crushing the screen residue conveyed with water and a transfer section for transferring the screen residue crushed by the crushing section. The device is characterized in that the transfer section comprises a pump body capable of running dry.
According to this screen residue conveying apparatus, the pump can be operated until the water level in the apparatus becomes substantially zero to convey a mixture of crushed screen residue and water. This makes it possible to prevent screen residues from accumulating in the apparatus.

Further, as one embodiment of the screen residue conveying apparatus of the present invention, the crushing unit includes a conveying path for conveying screen residue by water and a crusher for crushing the screen residue, and the crusher It is arranged in the channel and has the characteristic of being inclined with respect to the direction of water flow.
According to this feature, it is possible to efficiently wash and crush screen residue. In addition, since the crusher is arranged at an angle with respect to the direction of water flow, it is possible to prevent residue from stagnation in front of the crusher and allow the screen residue to easily flow into the crusher. This can further promote the crushing of screen residue.

Further, one embodiment of the screen residue conveying apparatus of the present invention is characterized in that the pump main body capable of idle operation is a jet pump utilizing a jet flow.
This feature makes it possible to use a pump that functions particularly well as the dry-running pump of the invention. A jet pump using a jet is a pump that transfers a target fluid using a high-pressure fluid (jet) from a nozzle, and does not have a driving part. Therefore, unlike other pumps that use a water flow (eddy current) generated by the rotation of the rotating blades within the pump body, the jet pump that uses jet flow does not overheat the driving part in the pump body even in an idle state. , no damage will occur. Therefore, it functions particularly well as a pump that can run dry according to the present invention.

Further, as one embodiment of the screen residue conveying apparatus of the present invention, the conveying section includes a suction pipe for sucking the crushed screen residue and water in the idling pump body. , and the height of the opening of the suction pipe is 0.8 to 2 times the diameter of the suction pipe.
According to this feature, the size of the screen residue flowing into the suction pipe can be controlled without lowering the efficiency of the screen residue flowing into the suction pipe. In addition, it is possible to suppress clogging of the pump.

In one embodiment of the screen residue conveying apparatus of the present invention, the suction pipe is provided with a pressure gauge, the pressure gauge detects a blocked state in the suction pipe, and the backwashing process is performed when the blocked state is detected. It has the feature of performing
According to this feature, when the suction pipe becomes blocked, the blocked state can be resolved without disassembling the device.

In one embodiment of the screen residue conveying apparatus of the present invention, the transfer section includes a discharge pipe for discharging the crushed screen residue and water from the idling pump main body, and the discharge pipe is interlocked with the pressure gauge. The backwashing process is performed by closing the opening/closing valve when the pressure gauge detects a blocked state in the suction pipe.
According to this feature, the backwashing process can be performed only by operating the on-off valve provided in the discharge pipe, and the clogged state of the suction pipe can be eliminated with a simple operation.

According to the present invention, there is provided a screen residue conveying apparatus that conveys a mixture of crushed screen residue and water, and is capable of preventing the screen residue that floated up after crushing the screen residue from accumulating in the apparatus. can do.

1 is a schematic explanatory view showing the structure of a screen residue conveying device according to a first embodiment of the present invention; FIG. FIG. 5 is a schematic explanatory view showing the structure of a screen residue conveying device according to a second embodiment of the present invention; FIG. 10 is a schematic explanatory diagram showing the structure of a screen residue conveying device according to a third embodiment of the present invention; FIG. 11 is a schematic explanatory view showing the structure of a screen residue conveying device according to a fourth embodiment of the present invention; FIG. 11 is a schematic explanatory view showing the structure of a screen residue conveying device according to a fifth embodiment of the present invention;

INDUSTRIAL APPLICABILITY The screen residue conveying apparatus of the present invention is used for pipe transfer of screen residue collected and separated in a settling basin facility such as a sewage treatment plant or a pump station. For example, in a settling basin facility, screen residue in sewage is collected by a bar screen or the like, and is raked up from the settling basin by a rake or the like. Conveyors and the like have conventionally been used to transport the scooped-up screen residue, but there are problems such as the scattering of sewage and the leakage of odors. Since the screen residue conveying apparatus of the present invention conveys the screen residue removed from the sewage through the piping, it is possible to prevent scattering of the sewage, leakage of odor, and the like.

Embodiments of a screen residue conveying apparatus according to the present invention will be described in detail below with reference to the drawings.
It should be noted that the screen residue conveying apparatus described in the embodiments is merely an example for explaining the screen residue conveying apparatus according to the present invention, and is not limited to this.

[First embodiment]
FIG. 1 is a schematic explanatory diagram showing the structure of a screen residue conveying device 1A according to the first embodiment of the present invention.
A screen residue conveying apparatus 1A according to this embodiment includes a crushing section 2 and a transfer section 3, as shown in FIG. The arrows in FIG. 1 indicate the flow of water.

The screen residue conveying apparatus 1A also has an input unit 4 into which the screen residue removed from the settling basin facility and water for making the screen residue into slurry are input. Means for introducing screen residue and water and the structure of the introduction unit 4 are not particularly limited. For example, a mixing unit (not shown) for mixing residue and water is provided in the preceding stage of the screen residue conveying apparatus 1A, and the screen residue and water are introduced from the input unit 4 via the mixing unit. On the other hand, for example, screen residue and water input units 4 are provided, and the screen residue and water are mixed in the screen residue conveying device 1A. Further, the input unit 4 may be provided with a control device for controlling the amount of inflow of screen residue and water. As a result, the inflow amount to be introduced can be changed according to the condition (quantity/quality) of the screen residues in the screen residue conveying device 1A, and the condition (quantity/quality) suitable for the processing in the screen residue conveying device 1A can be obtained. becomes easier.
Moreover, the water to be fed from the feeding part 4 is not particularly limited, and tap water, purified water, treated water, and the like can be mentioned. Considering the cost of procuring water, it is particularly preferable to use treated water discharged from a treatment facility such as a sewage treatment plant.

The crushing section 2 is for washing and crushing screen residue. As shown in FIG. 1, the crushing section 2 includes a conveying path 21A for screen residue conveyed by water, and a crusher 22 for crushing the screen residue. Moreover, the crusher 22 is installed in the conveyance path 21A.

The transport path 21A is configured to mix and transport screen residue and water, and water is stored up to a predetermined water level. Further, the transport path 21A forms a water flow toward the crusher 22 from the input unit 4 for inputting screen residue and water. The screen residue can be transported to the crushing section 21a by this water flow.

Means for forming the flow of water in the transport path 21A are not particularly limited. A height difference may be provided from the upstream side to the downstream side to utilize potential energy, or a device for forming a flow by power such as a screw may be provided in the conveying path 21A. In this embodiment, as shown in FIG. 1, a height difference is provided from the upstream side to the downstream side (in the direction from the loading section 4 to the transfer section 3 in FIG. 1) in the conveying path 21A.

A water level gauge S is provided in the transport path 21A, and measures are taken according to the observed water level. For example, when the water level rises above a predetermined value, the input of screen residue and water from the input unit 4 is stopped, and the drain unit 23 provided above the conveying path 21A is drained by overflow. In addition, when the water level falls below a predetermined value, the amount of inflow from the input unit 4 is increased when continuing the transport of screen residue. As a result, the amount of water necessary for conveying the screen residue is maintained in the conveying path 21A, so that stable conveying of the screen residue can be realized.
The screen residue conveying apparatus 1A in this embodiment has a structure capable of reducing the water level in the conveying path 21A to substantially zero in order to prevent the accumulation of screen residue in the conveying path 21A. Therefore, in this embodiment, there is no particular limitation regarding the provision of a warning means when the water level of the water gauge S drops below a predetermined value and a control mechanism based on the warning means.

The crusher 22 is used to crush the screen residue. By crushing the screen residue, the transport of the screen residue in the transport path 21A can be further promoted. In addition, screen residue includes metals, plastics, underwear, rags, fibers such as absorbent cotton, etc. contained in sewage and sewage. It can get entangled in equipment and cause equipment failure. Therefore, by crushing the screen residue with the crusher 22, it is possible to prevent equipment failures and the like. Further, by crushing the screen residue, it is possible to improve the washing efficiency of the screen residue.

Any type of crusher may be used as the crusher 22. For example, a twin-screw crusher having a plurality of crushing blades on a drive shaft may be used. In this embodiment, since the crusher 22 is installed inside the conveying path 21A, a vertical twin-screw crusher with an upright drive shaft is particularly preferable.
Moreover, regarding the installation of the crusher 22, it is preferable to make it inclined with respect to the flow direction of the water in the conveying path 21A. More specifically, it is particularly preferable to install the drive shaft of the vertical twin-screw crusher at an angle with respect to the bottom surface of the installation position of the conveying path 21A. As a result, it is possible to prevent the residue from stagnation on the upstream side of the crusher 22 and allow the screen residue to easily flow into the crusher 22 . As a result, it is possible to further promote the crushing of screen residues.

The transfer section 3 transfers the mixture of screen residue and water (hereinafter referred to as "mixed water") crushed by the crusher 22 by a pipe, and is connected to the downstream side of the conveying path 21A in the crushing section 2. there is As shown in FIG. 1, the transfer section 3 includes a suction pipe 31, a discharge pipe 32, and a pump main body 33 capable of idle operation.

The suction pipe 31 is provided on the conveying path 21A side of the crushing unit 2 and connected to a pump main body 33 capable of idle operation. The suction pipe 31 in this embodiment is installed at a position where the mixed water can be sucked from above the conveying path 21A and conveyed.

The arrangement position of the suction pipe 31 can be set based on the pipe diameter d of the suction pipe 31 . For example, if the height H from the opening 31a to the bottom surface of the conveying path 21A is smaller than the pipe diameter d, the opening 31a is likely to be blocked. It is preferably 0.8 times the pipe diameter d of the pipe 31 . On the other hand, if the height H from the opening 31a to the bottom surface of the transport path 21A is larger than the tube diameter d, a sufficient suction force cannot be obtained at the bottom surface of the transport path 21A, and screen residues remain on the bottom surface of the transport path 21A. The upper limit of the height H of the opening 31a is preferably twice the pipe diameter d of the suction pipe 31 from the viewpoint of facilitating the operation.

The discharge pipe 32 extends to the outside of the screen residue conveying apparatus 1A and is connected to the main body of a pump 33 capable of idle operation. Various processing devices for processing screen residues may be provided in the rear stage of the discharge pipe 32 .

Examples of various processing devices provided downstream of the discharge pipe 32 include a separator and a dehydrator.
The separator is for separating the mixed water into crushed screen residue and separated water. Any separator may be used as long as it is a device for solid-liquid separation, and examples thereof include a drum-type filtration device and a centrifugal separation device. The separated water may be returned to the settling basin facility, or may be returned to the input unit 4 in the present embodiment and used as water for making the screen residue into slurry.
Also, the dehydrator is for dewatering the screen residue separated into solid and liquid by the separator. The dehydrator may be any device as long as it is a device for removing water from solids, and examples thereof include screw press type, rotary press type, belt press type, and the like.

The pump main body 33 capable of idle operation enables transfer of the mixed water until the water level in the conveying path 21A becomes substantially zero. Note that the pump capable of idle operation refers to a pump that can be operated with no liquid in the pump body.

As the pump main body 33 capable of idle operation in this embodiment, it is preferable to use a jet pump using a jet flow.
In general, in a pump that utilizes a water flow (eddy current) generated by the rotation of the rotating blades inside the pump body, if a gas such as air is sucked in in addition to the liquid, the driving part of the rotating blades will have a sufficient cooling effect. is not obtained and frictional heat is generated. As a result, there is a problem that the pump body is overheated and damaged.
On the other hand, a jet pump is a pump that transfers a target fluid using pressurized water (jet flow) from a water supply pipe, and does not have a rotating vane and a driving part related to the rotating vane. Therefore, even if it is in an idle state, there is no heat generation from the driving part, and the pump main body is not overheated or damaged.

As shown in FIG. 1, in the jet pump 34 of this embodiment, when pressurized water is supplied from a water supply pipe 35 to a pressurized water chamber 34a within the jet pump 34, the pressurized water is supplied to an injection chamber 34b within the jet pump 34. It is jetted diagonally upward. The pressurized water jetted into the jetting chamber 34b passes through the jetting chamber 34b at a high flow rate and is discharged through the discharge pipe 32 to the outside of the screen residue conveying apparatus 1A. Due to the movement of the pressurized water at such a high flow rate, a vacuum state is formed in the injection chamber 34b and a suction force is generated in the suction pipe 31 . As a result, the mixed water in the conveying path 21A is sucked into the opening 31a of the suction pipe 31, passes through the suction pipe 31 and the injection chamber 34b, and is transferred from the discharge pipe 32 together with the pressurized water to the outside of the screen residue conveying apparatus 1A. be.
The jet pump 34 in this embodiment is of a type in which the suction pipe 31 is positioned in the central portion of the pressurized water chamber 34a in the jet pump 34, and the pressurized water from the water supply pipe 35 is ejected from the outer peripheral portion of the suction pipe 31. , the water supply pipe 35 may be of a type located in the center of the pressurized water chamber 34a in the jet pump 34. FIG.

A pressure gauge P is provided in the suction pipe 31, and measures are taken according to the observed pressure. The transfer section 3 in this embodiment is configured to suck and transfer the mixed water. Therefore, for example, when it is determined that the negative pressure in the suction pipe 31 has increased and the degree of vacuum has increased by the measurement of the pressure gauge P, it is determined that the suction pipe 31 is clogged, and measures are taken to eliminate the clogged state. take action.

It is preferable to backwash the inside of the suction pipe 31 as means for resolving the clogged state. As a result, the blockage can be resolved without disassembling the transfer section 3 .
As a specific means for backwashing the suction pipe 31, for example, a water supply pipe for backwashing is provided separately for the suction pipe 31, and when it is determined that the suction pipe 31 is in a clogged state, washing is performed from the water supply pipe for backwashing. For example, backwashing is performed by supplying water. Further, as shown in FIG. 1, the discharge pipe 32 is provided with an open/close valve 36 that can be controlled in conjunction with the pressure gauge P, and when the closed state is determined, the transfer section 3 is closed by closing the open/close valve 36. The water inside flows back through the discharge pipe 32 and the suction pipe 31 to perform backwashing.
In view of the ease of operation related to the backwashing process, it is preferable to perform the backwashing process using an on-off valve. In particular, when the jet pump 34 is used as the pump body 33 capable of idle operation, the pressurized water from the water supply pipe 35 flows back through the discharge pipe 32 and the suction pipe 31 by closing the on-off valve 36, so that the backwashing process is highly efficient. becomes possible.

As described above, with the screen residue conveying apparatus of this embodiment, the mixed water can be conveyed by operating the conveying section until the water level in the conveying path becomes substantially zero. As a result, it is possible to transfer the screen residue floating in the conveying path as the mixed water, thereby preventing the screen residue from accumulating in the screen residue conveying apparatus.
It should be noted that there is no particular limitation on the mode of carrying out the operation of transferring the mixed water until the water level in the transfer path becomes substantially zero using the screen residue transfer apparatus of this embodiment. For example, it may be carried out appropriately by an operator depending on the situation. Specifically, maintenance of a screen residue conveying device, etc., can be performed in a state in which input of screen residue is completely stopped, or performed when the amount of inflow of screen residue is small. Further, for example, regardless of the inflow amount of screen residues, the screen residue conveying apparatus of the present embodiment may be operated continuously at all times. In particular, when the pump body capable of idle operation in this embodiment is a jet pump, there is no change in operation control between normal operation and idle operation. Therefore, stable continuous operation is possible in the screen residue conveying apparatus of this embodiment.

[Second embodiment]
FIG. 2 is a schematic explanatory diagram showing the structure of a screen residue conveying device 1B according to the second embodiment of the present invention.
As shown in FIG. 2, the screen residue conveying apparatus 1B according to the present embodiment includes a conveying path 21B whose bottom surface is inclined over substantially the entirety of the water flow direction. As the crusher 22, a vertical twin-shaft crusher is installed in a substantially vertical direction. As a result, the crusher 22 is arranged in an inclined state with respect to the direction of water flow in the conveying path 21B.
It should be noted that the description of the configuration of the screen residue transporting device 1B in this embodiment that is the same as that of the screen residue transporting device 1A of the first embodiment will be omitted.

In this embodiment, as shown in FIG. 2, it is preferable to provide the transfer section 3 on the most downstream side of the conveying path 21B. As a result, screen residue floating in the mixed water tends to gather in the vicinity of the transfer section 3 when the transfer section 3 starts to transfer the mixed water. As a result, in the transfer section 3, the mixed water transfer efficiency including the floating screen residue is improved.

[Third embodiment]
FIG. 3 is a schematic explanatory diagram showing the structure of a screen residue conveying device 1C according to the third embodiment of the present invention. FIG. 3A is a side view of the screen residue conveying device 1C in this embodiment. Also, FIG. 3B is a cross-sectional view of the screen residue conveying device 1C in this embodiment (a view taken along line II in FIG. 3A).
As shown in FIG. 3, a screen residue conveying apparatus 1C according to this embodiment includes a conveying path 21C having an inclined side surface.
It should be noted that the description of the configuration of the screen residue transporting device 1C in this embodiment that is the same as that of the screen residue transporting device 1A of the first embodiment will be omitted.

In this embodiment, as shown in FIG. 3, the place where the transfer section 3 is arranged is not particularly limited as long as it is downstream of the crusher 22 . By inclining the side surface of the conveying path 21C, the screen residue floating in the mixed water tends to gather near the conveying section 3 when the mixed water is started to be conveyed by the conveying section 3 and the water level drops. As a result, in the transfer section 3, the mixed water transfer efficiency including the floating screen residue is improved.

[Fourth embodiment]
FIG. 4 is a schematic explanatory diagram showing the structure of a screen residue conveying device 1D according to the fourth embodiment of the present invention.
As shown in FIG. 4, the screen residue conveying apparatus 1D according to this embodiment has the suction pipe 31 of the transfer section 3 on the most downstream side of the conveying path 21A.
It should be noted that the description of the configuration of the screen residue transporting device 1D in this embodiment that is the same as that of the screen residue transporting device 1A of the first embodiment will be omitted. In this embodiment, the transport path 21A is used, but the present invention is not limited to this. For example, the transport path (21B or 21C) shown in the second or third embodiment may be used.

In this embodiment, as shown in FIG. 4, since the suction pipe 31 is provided on the most downstream side surface of the conveying path 21A, when the transfer unit 3 starts conveying the mixed water, the inside of the conveying path 21A water flows tend to converge in one direction. As a result, it is possible to further promote the transportation of the mixed water including screen residues that have surfaced.

[Fifth embodiment]
FIG. 5 is a schematic explanatory diagram showing the structure of a screen residue conveying device 1E according to the fifth embodiment of the present invention.
As shown in FIG. 5, the screen residue conveying apparatus 1E according to this embodiment has the suction pipe 31 of the transfer section 3 on the bottom surface of the conveying path 21A.
It should be noted that the description of the configuration of the screen residue conveying device 1E in this embodiment that is the same as the configuration of the screen residue conveying device 1A of the first embodiment will be omitted. In this embodiment, the transport path 21A is used, but the present invention is not limited to this. For example, the transport path (21B or 21C) shown in the second or third embodiment may be used.

In this embodiment, as shown in FIG. 5, the suction pipe 31 is provided on the bottom surface of the conveying path 21A. The flow tends to converge on the opening 31a side of the suction pipe 31 . As a result, it is possible to further promote the transportation of the mixed water including screen residues that have surfaced.

The embodiment described above is an example of the screen residue conveying apparatus. The screen residue conveying apparatus according to the present invention is not limited to the above-described embodiment, and the screen residue conveying apparatus according to the above-described embodiment may be modified without changing the gist of the claims.

For example, in the crushing section of this embodiment, a drain may be provided on the bottom surface of the conveying path on the upstream side of the crusher. As a result, when screen residue builds up on the upstream side of the crusher, the screen residue before crushing is removed via the drain, and the screen residue is re-charged from the charging unit 4, thereby crushing the screen residue more reliably. can be done.

Further, in order to prevent deposits from adhering to the suction pipe of the transfer section in this embodiment, a structure may be provided in which the inlet side of the suction pipe is covered with a barrier.

Further, the suction pipe of the transfer section in this embodiment may be configured to be movable, and the mixed water may be transferred by moving the opening of the suction pipe to a location where screen residues are present in the transfer path. good.

INDUSTRIAL APPLICABILITY The screen residue conveying apparatus of the present invention can be used for conveying screen residues in water treatment facilities such as sewage treatment plants, water purification plants, and pumping stations.

1A, 1B, 1C, 1D, 1E screen residue conveying device, 2 crushing section, 21A, 21B, 21C conveying path, 22 crusher, 23 drainage section, 3 transfer section, 31 suction pipe, 31a opening, 32 discharge pipe, 33 pump body capable of idle operation, 34 jet pump, 34a pressurized water chamber, 34b injection chamber, 35 water supply pipe, 36 on-off valve, 4 inlet, d diameter of suction pipe, H height of opening of suction pipe, P Pressure gauge, S Water level gauge

Claims (6)

a crushing unit for crushing screen residue conveyed by water;
a screen residue conveying device comprising a transfer section for transferring the screen residue crushed by the crushing section,
The crushing unit includes a conveying path for screen residue conveyed by water and a crusher for crushing the screen residue in water,
The transfer unit comprises a pump body capable of idle operation ,
The screen residue conveying apparatus , wherein the pump main body capable of idle operation is operated until the water level of the conveying passage becomes substantially zero . 2. The screen residue conveying apparatus according to claim 1, wherein said crusher is arranged in said conveying path and is inclined with respect to the direction of water flow. 3. The screen residue conveying apparatus according to claim 1, wherein said pump main body capable of idle operation is a jet pump using jet flow. The transfer unit includes a suction pipe for sucking crushed screen residue and water in the pump body capable of idle operation ,
The suction pipe is arranged so that the height of the opening of the suction pipe is 0.8 to 2 times the pipe diameter of the suction pipe with respect to the bottom surface of the conveying path. The screen residue conveying device according to any one of claims 1 to 3, characterized by the following. The suction pipe is equipped with a pressure gauge,
The screen residue according to any one of claims 1 to 4, wherein the pressure gauge detects a blocked state in the suction pipe, and when the blocked state is detected, a backwashing process is performed. Conveyor. The transfer unit includes a discharge pipe for discharging crushed screen residue and water from the pump body capable of idle operation ,
The discharge pipe includes an on-off valve that can be controlled in conjunction with the pressure gauge,
6. The screen residue conveying apparatus according to claim 5, wherein the backwashing process is performed by closing the on-off valve when the pressure gauge detects a clogged state in the suction pipe.

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