CN106563521B

CN106563521B - Crusher with filter screen

Info

Publication number: CN106563521B
Application number: CN201510885505.5A
Authority: CN
Inventors: 牧和久
Original assignee: Sumitomo Heavy Industries Environment Co Ltd
Current assignee: Sumitomo Heavy Industries Environment Co Ltd
Priority date: 2015-10-13
Filing date: 2015-12-03
Publication date: 2020-11-03
Anticipated expiration: 2035-12-03
Also published as: JP2017075449A; CN106563521A; KR101717860B1; JP6545070B2

Abstract

In a crusher with a strainer, which captures impurities in water to be treated by a strainer unit and scrapes the captured impurities to a crushing unit by a rotary rake unit, when the impurities are scraped, a part of the impurities may be involved in the rotation of a target and may not flow into the crushing unit and accumulate on the downstream side of the strainer unit. The invention aims to provide a crusher with a filter screen, which has the function of removing impurities accumulated on the filter screen part. In order to solve the above problem, the present invention provides a crusher with a filter screen, comprising: a filter screen unit for capturing foreign matters in the water to be treated; the crushing part is arranged on one side of the filter screen part and is used for crushing the impurities; and a rotary rake part for scraping the foreign matters captured by the strainer part to the crushing part, the rotary rake part being capable of forward and reverse operation. By operating the rotary harrow section in the reverse direction, foreign matters accumulated on the strainer section can be removed.

Description

Crusher with filter screen

The present application claims priority based on japanese patent application No. 2015-201921, filed on 10/13/2015. The entire contents of this Japanese application are incorporated by reference into this specification.

Technical Field

The present invention relates to a crusher which is installed in a water channel of a sewage treatment plant or the like and which crushes foreign matter such as residue suspended in water. More specifically, the present invention relates to a crusher with a strainer, which captures foreign matter such as residue suspended in water by a strainer unit, and scrapes the foreign matter captured by the strainer unit to a crushing unit by a rotary rake unit, thereby crushing the foreign matter by the crushing unit.

Background

A water channel of a sewage treatment plant or the like is provided with a crusher with a filter screen for crushing foreign matter such as residue suspended in water. A crusher with a screen provided in a water channel includes a crushing unit for crushing foreign matters, a screen unit for capturing foreign matters, and a rotary rake unit for scraping foreign matters captured by the screen unit to the crushing unit, and can scrape foreign matters flowing across the entire width of the water channel to the crushing unit and crush the foreign matters.

For example, patent document 1 describes an apparatus in which a screen device and a crusher provided on one side of the screen device are provided in a water channel so as to cross the water channel, and foreign matter in water is collected in the crusher. The filter screen device is composed of arc-shaped filter screen components which are stacked in the vertical direction and a rake shaft in the vertical direction, wherein a rake group rotating between the arc-shaped filter screen components is fixed on the rake shaft.

Patent document 1: japanese patent No. 3581017

When the rotary rake scrapes the inclusions, a part of the inclusions may be caught by the rotation of the rake and may not flow into the crushing unit. Then, the foreign substances entangled in the target are accumulated on the downstream side of the filter screen section. Since the rotation of the rake bears a load when the foreign matters are accumulated, the rake is normally stopped to remove the accumulated foreign matters when the foreign matters are accumulated.

Disclosure of Invention

The purpose of the present invention is to provide a crusher with a screen having a function of removing foreign matter accumulated in a screen section, thereby performing crushing treatment with excellent operability.

As a result of intensive studies on the above-described problems, the present inventors have found that foreign matters accumulated on the downstream side of the strainer can be removed by operating the rotary rake in the reverse direction, and have completed the present invention.

Specifically, the invention provides the following crusher with a filter screen.

In order to solve the above problem, a crusher with a screen according to the present invention includes: a filter screen unit for capturing foreign matters in the water to be treated; the crushing part is arranged on one side of the filter screen part and is used for crushing the impurities; and a rotary rake part for scraping the foreign matters captured by the filter screen part to the crushing part, wherein the rotary rake part can run in the forward direction and the reverse direction.

In the crusher with the strainer, the rotary rake portion is operated in the reverse direction, whereby the impurities accumulated during the forward operation can be removed by the rake. The removed foreign matter is conveyed upstream along the outer peripheral surface of the screen section by the rake which operates in the reverse direction, and scraped up to the crushing section when the forward operation is resumed.

Therefore, according to the crusher with the strainer, the foreign substances accumulated on the downstream side of the strainer portion can be removed by the rotary rake portion, and therefore, the crushing treatment with excellent operability can be performed.

In the present invention, the rotary rake portion includes a rotary shaft and a rake fixed radially from the rotary shaft.

In a rake conveyor or the like provided with a chain and a sprocket, a trouble such as the entanglement of small foreign matters passing through a screen part with the chain is likely to occur. However, since the rotary rake portion including the rotary shaft and the rake fixed radially from the rotary shaft is a simple structure, there is an advantage that such a trouble is not easily generated.

In the present invention, the rake of the rotary rake portion has a front surface portion at which the rake operates in the reverse direction, and an inclined portion that intersects the outer peripheral surface of the filter screen at an acute angle.

When the rake is accommodated in the inside of the screen section, the foreign matter taken out by the rake in the reverse operation may be caught by the rake and brought into the inside of the screen section.

According to the above feature, while the rake is operated in the reverse direction and protrudes from the outer peripheral surface of the strainer, the front surface of the rake is inclined rearward in the traveling direction, and therefore, the effect of preventing the foreign substances from being taken into the strainer is obtained.

In the present invention, the inclined portion has a 1 st inclined portion and a 2 nd inclined portion having different inclination angles with respect to the outer circumferential surface of the filter net, the 1 st inclined portion is formed at a tip of the rake, and the inclination angle of the 1 st inclined portion is smaller than the inclination angle of the 2 nd inclined portion.

With this feature, the rake is formed in a state in which the rake is further inclined toward the tip.

The 2 nd inclined part intersects with the outer peripheral surface of the screen part at an acute angle, thereby suppressing the entrainment of foreign substances into the screen, and the 2 nd inclined part intersects with the outer peripheral surface of the screen at a larger inclination angle than the 1 st inclined part. Therefore, the performance of the apparatus is higher than that of the 1 st inclined part in terms of the function of taking out the foreign matters accumulated in the screen part and the function of transporting the foreign matters to the upstream side of the screen part.

On the other hand, the 1 st inclined part has a smaller inclination angle than the 2 nd inclined part, so that the foreign material taking-out action and the conveying action are reduced, but a high effect is obtained in preventing the tip end part of the rake from catching the foreign material and bringing the foreign material into the filter screen.

That is, by forming the 1 st inclined part and the 2 nd inclined part, the action of taking out and conveying the accumulated foreign matters and the effect of preventing the conveyed foreign matters from being taken into the filter screen can be more reliably exerted.

The crusher with the filter screen according to the present invention further includes a control unit for controlling a rotation direction of the rotary rake unit, and the control unit intermittently operates the rotary rake unit and causes the rotary rake unit to start a forward operation and to pass a predetermined time t₁After the time, at least 1 reverse operation is executed.

According to this feature, since the operation of the rotary rake portion is intermittently performed, it is possible to provide a crusher with a strainer that reduces unnecessary operation time of the rotary rake portion and has an excellent energy saving effect.

On the other hand, when the rotary rake is operated intermittently, the amount of the foreign matter scraped at the start of the forward operation increases due to the presence of the foreign matter captured while the rotary rake is stopped. Therefore, it was confirmed that the amount of impurities accumulated in the downstream of the screen section was also increased when the forward operation was started. Here, in one cycle of the intermittent operation of the rotary rake portion, if the cycle is ended in a state where a large amount of foreign matters accumulated downstream of the screen portion remain, the amount of foreign matters scraped up at the time of starting the forward operation of the next cycle increases, and at this time, the load applied to the rotary rake portion becomes extremely high. Further, an overload of the rotary rake portion may cause a failure such as forced stop of the rotary rake portion.

However, according to the control unit, the predetermined t passes after the forward operation is started₁After the time, at least 1 reverse operation is performed, so that a large amount of accumulated forward operation is startedThe inclusions are removed until the forward operation is stopped. In addition, a predetermined t₁The time is a time for sufficiently scraping the foreign matters caught while the rotary rake part is stopped. The control unit prevents a large amount of foreign matter accumulated at the start of forward operation from remaining until the start of the next forward operation, thereby preventing an extremely high load from being applied to the rotary rake unit.

In the present invention, the control unit causes the rotary rake unit to start the forward operation and to pass a predetermined time t₁After the time, the reverse operation is performed for 1 time, and then the rotary harrow part is enabled to be arranged at intervals of specified t₂The time performs the reverse run.

If one cycle is performed for a long time in the intermittent operation of the rotary rake part, inclusions are gradually accumulated during the forward operation. According to the above feature, the interval of t is predetermined₂The reverse operation is performed for a long time, so that the inclusions gradually accumulated during the forward operation can be periodically removed.

According to the crusher with the screen of the present invention, since the crusher has a function of removing foreign substances accumulated on the downstream side of the screen section, crushing treatment with excellent operability can be performed.

Drawings

Fig. 1 is a schematic explanatory view showing a structure of a crusher with a filter screen according to embodiment 1 of the present invention.

Fig. 2 is a schematic explanatory view for explaining the operation of the crusher with a filter screen according to embodiment 1 of the present invention in the reverse operation.

Fig. 3 is a schematic explanatory view for explaining the shape of the rake of the crusher with a filter screen according to embodiment 1 of the present invention.

Fig. 4(a) to 4(C) are schematic explanatory views for explaining other shapes of the rake of the crusher with the filter screen according to the present invention.

Fig. 5 is a flowchart showing a flow of a program execution process of the control unit of the crusher with a strainer according to embodiment 1 of the present invention.

Fig. 6 is a schematic explanatory view showing the structure of a crusher with a filter screen according to embodiment 2 of the present invention.

In the figure: 1-screen section, 2-rotary rake section, 21-rake, 22-rotary shaft, 23-1 st inclined section, 24 a-2 nd inclined section, 25a, 25 b-inclined section, 3-crushing section, 4-screen section, 5-rotary rake section, 51a, 51 b-sprocket, 52-chain, 53-rake, R-canal, R1, R2-sidewall, G-inclusion, G-accumulated inclusion.

Detailed Description

Hereinafter, an embodiment of a crusher with a screen according to the present invention will be described in detail with reference to the accompanying drawings.

The crusher with the filter screen of the present invention is provided in a water channel and is used for crushing foreign matters in water to be treated flowing in the water channel. For example, the raceway may be a grit chamber of a sewage treatment plant or the like, and the inclusion may be a residue contained in wastewater such as sewage.

(embodiment 1)

Fig. 1 is a schematic explanatory view showing a structure of a crusher with a filter screen according to embodiment 1 of the present invention. In fig. 1, the operation of the crusher with a filter screen in the forward operation as indicated by the arrow in the figure will be described.

A crusher with a screen according to embodiment 1 of the present invention includes: a filter screen unit 1 for capturing foreign matter G contained in the water to be treated flowing through the canal R; a rotary harrow section 2 for scraping the foreign matters G captured by the filter screen section 1 to the crushing section 3; and a crushing section 3 for crushing the inclusions G.

The screen unit 1 is composed of a plurality of screen members stacked in a substantially vertical direction, and the screen members are provided at a spacing. The water to be treated flowing from the upstream side of the screen unit 1 passes through the gaps between the screen members, and the foreign matter G is captured on the upstream side of the screen unit 1. The member constituting the filter screen unit 1 may be any member, and may be, for example, a plate member having a plurality of slits formed in a substantially horizontal direction.

One end side of the screen section 1 is fixed to a side wall R1 of the ditch R, and the screen section 1 is provided so as to cross near the side wall R2. The other end side extends to the substantial center of the channel R, and is curved in an arc shape from the substantial center of the channel R toward the downstream side to form an arc portion, and is fixed to the casing side surface on the channel center side of the crushing portion 3.

The method of fixing the screen unit 1 is not particularly limited, and the screen unit 1 may be fixed to a case or the like surrounding the rotary rake unit 2 and the crushing unit 3.

The rotary rake part 2 is composed of a rotary shaft 22 and a plurality of rakes 21 radially fixed from the rotary shaft 22. The rakes 21 are plate blades having a thickness that can pass through the gaps of the stacked strainer members, and the rakes 21 are provided in the rotary rake section 2 in the same number as the gaps of the strainer section 1 in the height direction.

The rotary shaft 22 of the rotary rake 2 is eccentrically disposed from the center of the circular arc portion of the screen part 1, and when the rake 21 rotates about the rotary shaft 22, the rake 21 protrudes from between the screen members. While the rake 21 protrudes from the outer peripheral surface of the screen unit 1, the foreign matter G captured by the screen unit 1 is scraped and flows into the crushing unit 3.

The rotary rake part of the present invention may have any configuration as long as it can scrape and collect the foreign matters G caught by the screen part 1 to the crushing part 3, and may be appropriately designed according to the shape of the screen part 1. For example, in addition to the configuration including the rotary shaft 22 and the rake 21 as in the rotary rake part 2 of embodiment 1, there is also a configuration including a rake-attached chain and a plurality of sprockets for circulating the chain as in the rotary rake part 5 of embodiment 2 described later.

The rotary rake part comprising the rotary shaft 22 and the rakes 21 radially attached from the rotary shaft 22 as in the rotary rake part 2 of embodiment 1 has an advantage that the trouble such as the inclusion entanglement in the rotary rake part 2 is not easily caused because the rotary rake part does not have a structure in which they mesh with each other like a chain and a sprocket and has a simple structure.

The crushing section 3 of embodiment 1 of the present invention is provided between the screen section 1 and the side wall R2 of the channel R. As the crushing section of the present invention, any crusher, for example, a vertical twin-shaft crusher, a horizontal crusher, or the like can be used. Since the crusher can be set to the same height as the screen section 1, it is preferable to use a vertical crusher.

As described above, by operating the rotary rake part 2 in the forward direction, the foreign matters G caught by the strainer part 1 can be scraped to the crusher part 3, and the foreign matters G can be crushed by the crusher part 3.

However, as shown in fig. 1, some of the inclusions G may be caught in the rotation of the rotary rake 2 and may not flow into the crusher 3 and may be accumulated on the downstream side of the screen unit 1.

Therefore, the rotary rake 2 of the crusher with a strainer according to the present invention has a function of operating in reverse in order to remove the accumulated foreign matters g.

Hereinafter, the reverse operation of the rotary harrow section 2 will be described with reference to fig. 2.

As shown in fig. 2, the impurities g accumulated on the downstream side of the screen unit 1 can be taken out by the rake 21 by operating the rotary rake unit 2 in the reverse direction. The removed foreign matter g is then conveyed upstream along the outer peripheral surface of the screen unit 1 by the rake 21 which runs in the reverse direction.

When the rake 21 is accommodated inside the screen unit 1 on the upstream side, the foreign matter g conveyed along the outer peripheral surface of the screen unit 1 is detached from the rake 21 and remains on the outer peripheral surface of the screen unit 1.

Further, the inclusions g remaining on the outer peripheral surface of the screen portion 1 are scraped to the crushing portion 3 at the restart of the forward operation, and are crushed.

The rake 21 has a shape in which a front surface portion (a rear surface in a forward operation) in a reverse operation thereof includes a 1 st inclined portion and a 2 nd inclined portion which intersect the outer peripheral surface of the screen portion 1 at acute angles. That is, when the rake 21 that performs the reverse operation protrudes from the outer peripheral surface of the screen unit 1, the inclined portion is inclined rearward in the traveling direction.

In the present invention, when the outer peripheral surface of the screen section 1 is curved, the angle (inclination angle) formed by the outer peripheral surface of the screen section 1 and the inclined section is the angle formed by the tangent T of the screen section 1 and the inclined section.

The foreign matter g conveyed to the upstream side of the screen unit 1 by the reverse operation is sometimes caught by the rake 21 and brought into the inside of the screen unit 1 when the rake 21 is accommodated in the inside of the screen unit 1.

However, as in the rake 21 of the present invention, the front surface portion in the reverse operation is provided with the inclined portion that intersects the outer peripheral surface of the screen unit 1 at an acute angle, so that the foreign matter g can be prevented from being taken into the screen unit 1.

Next, referring to fig. 3, the inclined portion will be described in detail. As shown in fig. 3, the inclined part of the rake 21 has the 1 st inclined part and the 2 nd inclined part having different inclination angles with respect to the outer circumferential surface of the screen part 1.

The 1 st inclined part is formed at the tip of the rake 21, and has an inclination angle (α) smaller than that of the 2 nd inclined part. When the rake 21 is accommodated in the inside of the screen part 1, the foreign matter g is easily caught by the tip and is strongly brought into the inside of the screen part 1. Therefore, the inclination angle of the 1 st inclined part formed at the tip of the rake 21 is preferably set to be small.

The inclination angle (α) of the 1 st inclined part is not particularly limited, but is preferably 1 to 60 °, and particularly preferably 3 to 50 °. When the angle (γ) between the 1 st inclined part and the 2 nd inclined part is smaller than 1 °, the foreign matter g is easily caught by the angle between the 1 st inclined part and the 2 nd inclined part, and when the angle exceeds 60 °, the foreign matter g is easily caught by the tip of the rake 21 because the angle of inclination is larger.

The 2 nd inclined part is an inclined part formed adjacent to the 1 st inclined part, and has an inclination angle (β) greater than that of the 1 st inclined part. When the inclination angle of the inclined portion is reduced, the effect of bringing the inclusions g into the filter screen portion 1 is reduced, and the effect of taking out the inclusions g is also reduced. Therefore, the 2 nd inclined part is made to have an inclination angle larger than that of the 1 st inclined part, thereby improving the performance of taking out the inclusions g.

The inclination angle (β) of the 2 nd inclined part is not particularly limited, but is preferably 20 to 89 °, and particularly preferably 30 to 70 °. If the temperature is less than 20 °, the effect of removing the inclusions g is small, and the inclusions g may not be removed. On the other hand, if the temperature exceeds 89 °, the effect of introducing the foreign matter g into the inside of the screen part 1 becomes large, and the foreign matter g may flow into the inside of the screen part 1.

The angle (γ) formed by the 1 st inclined part and the 2 nd inclined part is not particularly limited, but is preferably 95 to 175 °, and particularly preferably 110 to 165 °. If the angle is less than 95 °, the inclusions g are easily caught by the angle formed between the 1 st inclined part and the 2 nd inclined part, and if the angle exceeds 175 °, the 1 st inclined part and the 2 nd inclined part have almost the same inclination angle, so that the effect of providing the 1 st inclined part and the 2 nd inclined part is small.

In the present invention, the rake of the rotary rake portion may not be provided with the inclined portion. In addition, a single inclined portion may be provided, or 3 or more inclined portions may be provided. In view of the action of taking out and transporting the inclusions g to the upstream side, the action of preventing the inclusions g from being taken into the inside of the filter screen section 1, and the like, it is preferable to provide 2 or more inclined sections having different inclination angles.

Also, the inclined portion is preferably formed on the entire area protruding from the outer circumferential surface of the screen section 1 at the front portion of the rake 21 in the reverse operation. This can further prevent the inclusion g from being taken into the filter screen section 1.

Next, another embodiment of the inclined portion will be described with reference to fig. 4(a) to 4 (C). Fig. 4(a) shows an example of a rake having a single inclined portion 25 a. The inclination angle of the single inclined portion with respect to the outer peripheral surface of the filter screen portion 1 is not particularly limited, but is preferably 20 to 89 °, particularly preferably 30 to 70 °, in view of both the function of removing the foreign matter g and the function of preventing the foreign matter g from being taken into the filter screen portion 1, as well as the inclination angle (β) of the 2 nd inclined portion.

Fig. 4(B) shows an example of a rake having a single curved inclined portion 25B. In this way, the inclined portion can be bent in the forward direction during reverse operation.

In the present invention, when the inclined portion has a curve, the inclination angle of the inclined portion with respect to the outer peripheral surface of the screen portion 1 is an inclination angle of a straight line (chord) connecting the start point and the end point of the curve with respect to the outer peripheral surface of the screen portion 1.

Fig. 4(C) shows an example of a rake having a curved 2 nd inclined part 24a and a straight 1 st inclined part 23. In this way, the curved inclined portion and the linear inclined portion can be combined to form the inclined portion.

Further, since the curved inclined portion has a small effect of taking out the accumulated inclusions g, the inclined portion is preferably formed of a linear inclined portion.

[ control section ]

Next, a control unit for controlling the rotation direction of the rotary rake 2 of the present invention will be described. The control unit, although not shown in fig. 1, is an electronic computer connected to the rotary rake 2 and controls the rotation direction of the rotary rake 2.

The control part of the invention makes the rotary harrow part 2 operate discontinuously. This can provide a crusher with a strainer that reduces unnecessary operation time of the rotary rake 2 and has an excellent energy saving effect.

The control unit of the present invention causes the rotary harrow unit 2 to operate in the forward direction and to pass a predetermined time t₁After the time, at least 1 reverse operation is executed.

If the rotary rake 2 is intermittently operated, the foreign matters G remain in the screen unit 1 while the rotary rake 2 is stopped. Therefore, the number of scraped inclusions G increases at the start of the forward operation, and the number of inclusions G accumulated downstream of the screen unit 1 without flowing into the crushing unit 3 also increases. In consideration of the problem of the rise of the load applied to the rotary rake part 2, etc., it is preferable that the amount of the foreign matters g accumulated downstream of the strainer part 1 is small at the start of the forward operation.

By starting forward operation and passing through a specified t₁After the time, at least 1 reverse operation is performed, and a large amount of the inclusions g accumulated at the time of starting the forward operation are removed until the forward operation is stopped, so that the forward operation can be stopped in a state where the amount of the accumulated inclusions g is small. Therefore, it is possible to avoid the rotary rake part 2 from being excessively loaded due to the temporary increase of the inclusions g at the start of the next forward operation.

Fig. 5 is a flowchart showing a flow of a program execution process performed by the control unit of the crusher with a filter screen according to embodiment 1 of the present invention. The flowchart of fig. 5 is an example of a forward operation execution program of the control unit of the present invention, and the present invention is not limited thereto.

In the forward running execution program of fig. 5, after a forward running start command is input, a predetermined time t elapses₁And automatically inputting a reverse operation starting instruction after the time so as to start the reverse operation. When the predetermined reverse operation routine is finished, the reverse operation is stopped.

Thereafter, if there is no forward operation stop command, every predetermined time t₂The time execution runs the program backwards. At the passage of t₁After the time and after executing at least one reverse operation, if the input of the forward operation stopping instruction exists, stopping the forward operation, and ending the forward operation execution program.

When the predetermined value t has elapsed₁If the forward operation stop instruction is input before the time, the forward operation execution program may be ended after the reverse operation program is executed, or the forward operation execution program may be ended without executing the reverse operation program.

Here, for t₁Time sum t₂The function of time will be explained. t is t₁The time is a time for scraping up the inclusions G remaining in the screen section 1 during the stop of the forward operation. If the inclusions G remaining in the screen unit 1 are scraped, the number of inclusions G deposited on the downstream side of the screen unit 1 increases. Therefore, t is preferably set₁The time is set to be short and the inclusions g increasing after the start of the forward running are quickly removed. As t₁The time is preferably 1 to 30 minutes, and particularly preferably 2 to 20 minutes.

t₂The time is a time at which an interval of the reverse operation routine for periodically removing the inclusions g gradually accumulated during the duration of the forward operation is set. Thus, t₂Time is a ratio t₁The long time is preferably 30 minutes or more, and particularly preferably 1 hour or more.

The start command or the stop command for the forward operation may be input by any method, for example, a method in which an operator manually inputs the start command or the stop command, a method in which the start command or the stop command is input at predetermined time intervals, a method in which the start command or the stop command is input in accordance with the measured value of the flow rate in the ditch R reaching a predetermined value, or the like.

(embodiment 2)

The crusher with a filter screen of embodiment 2 includes: a screen section 4 having a long straight section and a curved arc section which are provided to be inclined in the downstream direction; and a rotary rake part 5 having a chain 52 to which a rake 53 is attached and 2 sprockets 51a, 51b for driving the chain 52. The other structure is the same as that of embodiment 1.

A crusher with a strainer provided with a rotary rake 5 using a chain and a plurality of sprockets as in embodiment 2 can be installed in a canal R of any width. And is therefore suitable for a crusher with a filter screen provided in a wide canal R.

In the crusher with a strainer according to embodiment 2, the rotary rake 5 is also configured to be capable of operating in reverse, and has a function of removing the foreign matters g accumulated on the downstream side of the strainer 4, as in embodiment 1.

Also, like the rake 21 of embodiment 1, the rake 53 attached to the chain 52 has an inclined portion that intersects the outer peripheral surface of the screen section 4 at an acute angle at its front face when it runs in reverse.

Industrial applicability

The crusher with the filter screen of the present invention can be used as a crusher for crushing foreign matters in water to be treated flowing in a water channel. Specifically, for example, it can be used as a crusher that captures and crushes residue as inclusions in a grit chamber of a sewage treatment plant.

Claims

1. The utility model provides a take breaker of filter screen which characterized in that possesses:

a filter screen unit for capturing foreign matters in the water to be treated;

a crushing part which is arranged at one side of the filter screen part and is used for crushing the impurities; and

a rotary harrow part for scraping the impurities captured by the filter screen part to the crushing part,

the rotary harrow part can perform forward and reverse operation,

the crusher with the filter screen is also provided with a control part for controlling the rotation direction of the rotary harrow part,

the control part makes the rotary harrow part intermittently run and makes the rotary harrow part run in the forward direction and pass a specified t₁After the time, at least 1 reverse operation is executed;

wherein the rotary harrow section comprises a rotary shaft and a harrow fixed in a radial manner from the rotary shaft,

the front part of the harrow in the reverse running is provided with an inclined part which crosses the outer peripheral surface of the filter screen at an acute angle,

the inclined part has a 1 st inclined part and a 2 nd inclined part having different inclination angles with respect to the outer circumferential surface of the filter screen, the 1 st inclined part is formed at a tip end of the rake, and the inclination angle of the 1 st inclined part is smaller than the inclination angle of the 2 nd inclined part, so as to take out foreign objects accumulated at a downstream side of the filter screen part and reversely convey the foreign objects to an upstream side of the filter screen part and prevent the foreign objects at the upstream side of the filter screen part from being taken into the inside of the filter screen part.

2. The crusher with filter screen of claim 1,

the control part makes the rotary harrow part run in the positive direction and pass a specified t₁After the time, the reverse operation is performed for 1 time, and then the rotary harrow part is enabled to be arranged at intervals of specified t₂The time performs the reverse run.