JP2020111945A - Crusher screen device, control device of crusher screen device and operation method of crusher screen device - Google Patents

Abstract

To provide a crusher screen device having a function for removing contaminants on the screen device, and capable of reducing a load of the screen device in contaminant treatment in a conduit, a control device of the crusher screen device and an operation method of the crusher screen device.SOLUTION: There are also provided a crusher screen device, a control device of the crusher screen device and an operation method of the crusher screen device having a screen part 5 for transferring contaminants G in a conduit, and a control part for controlling an operation of the screen part. When the control part detects an overload at the screen part, the control part performs a reverse operation at an angle or larger per rotation (the number of pieces of rakes on a rotating face). By this constitution, the operation method performs the reverse operation by a predetermined angle, removes the contaminants being a factor of the overload of the screen part from a point at which an overload state is detected, and can perform processing while reducing a load applied on the screen device.SELECTED DRAWING: Figure 2

Description

The present invention provides a screen device, a control device for a screen device, and a screen device that are installed in a water channel of a sewage treatment plant or the like and that transfer contaminants to a crusher for crushing contaminants such as residue floating in water. It relates to the driving method of. More specifically, a screen device that captures impurities such as dust floating in water with a screen member, and scrapes the contaminants captured by the screen member to a crusher by a rotary rake unit, a control device for the screen device, and a screen device. It relates to the driving method of.

In the waterways of sewage treatment plants, etc., a crusher with a screen is installed for crushing contaminants such as residue floating in water. The crusher with a screen installed in the waterway is a crusher for crushing contaminants, a screen member for capturing contaminants, and a scraper for scraping contaminants captured by the screen member to the crusher. It is equipped with a screen device consisting of a rotary rake part, and it is possible to scrape and crush the impurities flowing over the entire width of the water channel to the crushing part.

For example, Patent Document 1 describes a device in which a screen device and a crusher installed on one side of the screen device are transversely installed in a water channel to collect impurities in water into the crusher. This screen device comprises vertically stacked arcuate screen members and a vertical rake shaft that secures a rake group that rotates between the arcuate screen members. The rake shaft is the outer peripheral edge of the screen. The rake is installed eccentrically to the center of the rake, so that the tip of the rake protrudes and retracts from the outer peripheral edge of the screen, and the impurities trapped on the screen are scraped to the crusher.

JP, 11-324101, A

In the crusher with a screen as disclosed in Patent Document 1, in the screen device, when the contaminants are scraped by the rotating rake, some of the contaminants may be caught in the rotation of the rake and do not flow into the crusher. Then, the contaminants caught in the rake are deposited on the downstream side of the screen member. In addition, foreign matter may be caught in the gap between the screen members. Since the accumulation and inclusion of such foreign matter imposes a load on the rotation of the rake, the operation of the crusher with a screen was stopped to remove the foreign matter as the cause. However, stopping the operation of the crusher with a screen causes a problem that the treatment efficiency is lowered and also causes a problem that the treatment load is increased due to the retention of impurities in the water to be treated.
Therefore, when the accumulation or biting of impurities in the screen device occurs, the load on the screen device is reduced by removing the impurities on the screen device without immediately stopping the operation of the crusher with a screen and crushing. It is required to be able to continue processing.

An object of the present invention is to provide a screen device for transferring contaminants to a crusher for crushing contaminants such as residue in the water to be treated, having a function of removing contaminants on the screen device, and loading the screen device. A screen device for a crusher, a control device for the screen device for the crusher, and a method for operating the screen device for the crusher, which can reduce the amount of noise.

The present inventor, as a result of diligent examination of the above problems, in a crusher screen device for transferring contaminants to a crusher, a control unit for controlling the operation of the screen unit is provided, and when an overload is detected in the screen unit, The present invention has been completed by finding that the load of the screen portion can be reduced and the crushing process can be continuously performed by operating the screen portion in the reverse direction in the reverse direction.
That is, the present invention is the following crusher screen device, crusher screen device control device, and crusher screen device operating method. Hereinafter, the screen device for a crusher according to the present invention may be simply referred to as a screen device.

The crusher screen device of the present invention for solving the above problems is a crusher screen device that transfers contaminants to a crusher that crushes contaminants in a waterway, and a screen portion that transfers contaminants. ,, a control unit for controlling the operation of the screen unit, the screen unit is composed of a screen for capturing foreign substances, a rotary rake unit provided with a rake for scraping the foreign substances captured by the screen, the control unit is When the screen portion detects an overload, the reverse rotation operation is performed at an angle of one rotation/(the number of rakes on the rotating surface) or more.
According to this crusher screen device, by detecting the overload state in the screen portion including the screen and the rotary rake portion, by performing the reverse operation of the rotary rake portion for a predetermined angle, the cause of the overload of the screen portion It is possible to perform the processing in a state in which the foreign matter is removed and the load on the screen device is reduced.

Further, as an embodiment of the crusher screen device of the present invention, the control unit returns to the normal rotation operation after executing the reverse rotation operation, and again when the overload is detected after the normal rotation operation is performed for a predetermined time. It has a feature of performing reverse rotation operation and continuing normal rotation operation when overload is not detected.
According to this feature, by switching the forward rotation operation and the reverse rotation operation in the screen portion in accordance with the overload state of the screen portion, it is possible to reduce the number of times of maintenance and labor and to stably operate the screen device. ..

Further, as an embodiment of the crusher screen device of the present invention, the control unit has a feature of stopping the operation of the screen unit when the number of overload detections exceeds a predetermined number.
According to this feature, when the number of overload detections exceeds a predetermined number, it is determined that the overload state cannot be eliminated by the forward rotation operation and the reverse rotation operation, and the screen unit is stopped to stop the screen device. This makes it possible to take appropriate measures such as protection and elimination of an overload condition by another means.

The control device of the crusher screen device of the present invention for solving the above-mentioned problems is a crusher screen device provided in the crusher screen device that transfers the contaminants to the crusher that crushes the contaminants in the waterway. The control device, the crusher screen device, a screen for capturing the contaminants, and a screen unit for transferring the contaminants consisting of a rotary rake unit provided with a rake to scrape the contaminants captured by the screen, The control device includes a control unit that controls the operation of the screen unit. When the control unit detects an overload in the screen unit, the control unit performs a reverse rotation operation at an angle of one rotation/(the number of rakes on the rotating surface) or more. It is characterized by performing.
According to this feature, by detecting an overload state in the screen unit including the screen and the rotary rake unit, and performing the reverse rotation operation of the rotary rake unit for a predetermined angle, the contaminants that cause the overload of the screen unit are eliminated. The technology related to the control for performing the processing while removing the load and reducing the load on the screen device can be used in various screen devices. In particular, by applying it to the screen device of an existing crusher with a screen, a screen device that enables processing with reduced load on the screen device by simple installation work without updating the entire crusher with a screen. And it can be replaced with a crusher with a screen.

The operating method of the screen device for a crusher of the present invention to solve the above problems is a method of operating a screen device for a crusher that transfers contaminants to a crusher that crushes contaminants in a waterway. The screen device for use includes a screen section for transferring contaminants, and a control section for controlling the operation of the screen section, and the screen section scrapes the contaminants captured by the screen and the screen for capturing the contaminants. A rotary rake unit provided with a rake is provided, and when the screen unit detects an overload, the screen unit is provided with a step of performing a reverse rotation operation for an angle of one rotation/(the number of rakes on the rotating surface) or more. ..
According to this feature, by detecting an overload state in the screen unit including the screen and the rotary rake unit, and performing the reverse rotation operation of the rotary rake unit for a predetermined angle, the contaminants that cause the overload of the screen unit are eliminated. The processing can be performed in a state where the load is removed and the load on the screen device is reduced.

According to the present invention, in the screen device for transferring the impurities to the crusher for crushing the impurities such as the residue in the water to be treated, the screen device has a function of removing the impurities on the screen device, and the load of the screen device. It is possible to provide a crusher screen device, a crusher screen device control device, and a crusher screen device operating method that can reduce the above-mentioned problem.

It is a schematic explanatory drawing which shows the structure of the crusher with a screen provided with the screen device for crushers of the 1st Embodiment of this invention. It is a schematic explanatory drawing which shows operation control of the crusher screen device of the 1st Embodiment of this invention. It is a schematic explanatory drawing which shows the operation control of the screen device for other crushers of the 1st Embodiment of this invention. It is a flow chart which shows operation control of a screen device for a crusher of a 1st embodiment of the present invention. It is a schematic explanatory drawing which shows the structure of the screen device for crushers of the 2nd Embodiment of this invention. It is an enlarged view which shows the structure of the screen part in the screen device for crushers of the 2nd Embodiment of this invention. It is a schematic explanatory drawing which shows the structure of the screen apparatus for crushers of the 3rd Embodiment of this invention. It is a schematic explanatory drawing which shows the structure of the crusher screen apparatus of the 4th Embodiment of this invention.

Hereinafter, embodiments of the crusher screen device, the crusher screen device control device, and the crusher screen device operating method according to the present invention will be described in detail with reference to the drawings. Further, the description of the method of operating the crusher screen device according to the present invention shall be replaced with the description of the operation control of the crusher screen device according to the present invention.
Note that the crusher screen device and the control device for the crusher screen device described in the embodiments are exemplified for explaining the crusher screen device and the crusher screen device control device according to the present invention. However, the present invention is not limited to this. In addition, regarding the operating method of the screen device for the crusher described in the embodiment, the operating method of the screen device for the crusher using the screen device for the crusher and the control device for the screen device for the crusher according to the present invention will be described. However, the present invention is not limited to this.

The screen device for a crusher of the present invention is installed in a water channel together with the crusher and is used for treating impurities in the water to be treated flowing through the water channel. For example, the water channel may be a sand basin such as a sewage treatment plant, and the contaminant may be a residue contained in sewage such as sewage. The structure of the water channel described in the embodiment is merely an example for explaining the crusher screen device and the crusher with a screen including the crusher screen device according to the present invention, and is not limited thereto. Not a thing.

[First Embodiment]
(Crusher with screen)
FIG. 1 is a schematic explanatory view showing a structure of a crusher with a screen including a crusher screen device according to a first embodiment of the present invention.

The crusher with a screen 100 according to the first embodiment of the present invention is for crushing a contaminant G contained in the water to be treated flowing through the water passage R. The crusher with a screen 100 of the present embodiment includes a crusher 1 for crushing the contaminant G contained in the water to be treated flowing through the water channel R, and a screen device 2A for transferring the contaminant G to the crusher 1. ing. The crusher 1 is arranged on one side of the screen device 2A. Further, the crusher 1 and the screen device 2A are installed close to each other so as to cross the water channel R.

The crusher 1 is for crushing the impurities G in the water to be treated flowing in the water channel R. The crusher 1 may be arranged so that the contaminants G are supplied from the screen device 2A. For example, as shown in FIG. 1, the crusher 1 is installed between the screen device 2A and the side wall R2 of the water channel R. There are things. Further, the crusher 1 of the present embodiment may be any crusher, and examples thereof include a vertical biaxial crusher and a horizontal crusher.
Although the vertical crusher is illustrated as the crusher 1 of this embodiment, it is not limited to this. The vertical crusher illustrated in the present embodiment has an advantage that the crusher 1 can be installed evenly in the height direction of the screen device 2A.

As shown in FIG. 1, the crusher 1 has an inlet 11 for introducing water to be treated formed on the front surface (upper side in the drawing) and an outlet 12 for discharging water to be treated formed on the rear surface. The crusher 1 also rotatably supports two rotary crushing blades 13a and 13b around an axis extending in the vertical direction (direction perpendicular to the plane of the drawing), and the width in the water channel R so that the blades mesh with each other. It is lined up in the direction. Further, the crusher 1 is provided with a drive unit (not shown) for rotating and driving the rotary crushing blades 13a and 13b on the upper part thereof. A vertical electric motor is provided as the drive unit of this embodiment.

Then, the crusher 1 is driven by the drive unit (vertical electric motor) so that the rotary crushing blades 13a and 13b rotate in the direction in which the contaminant G is rolled up, and the treated water is introduced from the inlet 11 to be treated. The contaminant G in the treated water and the contaminant G transferred from the screen device 2A are crushed by being sandwiched between the rotary crushing blades 13a and 13b, and discharged from the discharge port 12 to the downstream side. As shown in FIG. 1, in the crusher 1 of the present embodiment, the drive unit is driven with a predetermined output, the rotary crushing blade 13a rotates clockwise, and the rotary crushing blade 13b rotates counterclockwise. By doing so, the contaminant G is crushed.

The screen device 2A is for transferring the contaminants G to the crusher 1. The screen device 2A is provided on the upstream side of the crusher 1, captures the contaminant G in the water to be treated, and scrapes the contaminant G to the crusher 1. As a result, the contaminants G can be reliably supplied to the crusher 1, and the crushing efficiency of the crusher 100 with a screen is improved.
Hereinafter, the screen device 2A will be described in detail.

(Screen device)
FIG. 2 is a schematic explanatory view showing the structure of the crusher screen device according to the first embodiment of the present invention. The dashed-dotted line arrow indicates that the connection is controllable.

2 A of screen devices of this embodiment are equipped with the screen part 3 which transfers the foreign material G, and the control part 4 which controls operation|movement of a screen part. In addition, the screen unit 3 includes a screen 5 that captures the contaminants G, and a rotary rake unit 6 that scrapes the contaminants G captured by the screen 5 toward the crusher 1.

The screen 5 is composed of a plurality of screen members stacked in a substantially vertical direction, and the screen members are installed apart from each other. The water to be treated flowing from the upstream side of the screen 5 passes through the gaps between the screen members, and the impurities G larger than the gaps between the screen members are captured on the upstream side of the screen 5. Any member may be used to form the screen 5, and for example, a plate member having a plurality of slits formed substantially horizontally may be used.

The other end of the screen 5 (opposite to the crusher 1) is fixed to the side wall R1 of the water channel R, and the one side (crusher 1 side) of the screen 5 extends to approximately the center of the water channel R. Forming a circular arc portion that is curved in a circular arc shape from the approximate center to the downstream side. Then, one side of the screen 5 is fixed to the casing side surface of the crusher 1 on the central side of the water channel.
The shape of the screen 5 preferably has an arc portion from the viewpoint of capturing and transferring the contaminant G, but is not limited to this. For example, it may have an arcuate portion formed by a polygonal line from the approximate center of the water channel R toward the downstream side.

As described above, the screen 5 forms an arc portion on one side (the crusher 1 side), and the arc portion extends to the upstream region of the crusher 1. Thereby, the contaminants G captured on the screen 5 can be appropriately guided to a position where the blade of the crusher 1 meshes.

The rotary rake unit 6 includes a rotary shaft 63, a plurality of rakes 61 fixed to the rotary shaft 63, and a drive unit 64 that rotationally drives the rotary shaft 63. The rake 61 is a flat plate having a thickness that allows it to pass through the gap between the stacked screen members, and the rotary rake portion 6 has the same number of rakes 61 as the gap formed in the screen 5 arranged in parallel in the height direction. There is. The rotation of the rake 61 in the direction in which the contaminants G are transferred to the crusher 1 side by the drive unit 64 is called normal rotation operation of the rotary rake unit 6, and particularly, the rotation speed of the rake 61 falls within a predetermined range. A certain time is called normal operation.

The rake 61 of the rotary rake unit 6 is for scraping the contaminant G. The material of the rake 61 is preferably made of an elastic body such as rubber or leaf spring, and particularly preferably made of hard rubber. Accordingly, when a hard material such as wood is sandwiched as the foreign matter G, the rake 61 is elastically deformed, so that damage to the rake 61 can be suppressed.

Further, the shape of the rake 61 is not particularly limited as long as it can scrape the foreign matter G. For example, as shown in FIG. 1, the tip end portion of the rake 61 has a radial length of an end portion on the front side with respect to the rotation direction of the rake 61 at the time of normal rotation as compared with a radial direction of an end portion on the opposite side. It can be mentioned that the inclined surface 62 is elongated. As a result, the contaminants G can be efficiently transferred without being entangled at the tip of the rake.

A plurality of rakes 61 are fixed to the rotary shaft 63 of the rotary rake unit 6, and are installed eccentric to the center of the arc portion of the screen 5. When the rotary shaft 63 is rotationally driven by the drive unit 64 and the rake 61 orbits around the rotary shaft 63, the rake 61 projects from between the screen members. Then, while the rake 61 projects from the outer peripheral surface of the screen 5, the foreign matter G captured by the screen 5 is scraped and flows into the crusher 1.

The fixed position of the rake 61 with respect to the rotating shaft 63 is not particularly limited as long as the rakes 61 are arranged in the height direction in the same number as the gaps formed in the screen 5. For example, one in which all the rakes 61 are arranged in a line with respect to the rotating shaft 63 can be cited. This facilitates the design and assembly of the rotary rake unit 6. In addition, the rake 61 may be fixed by shifting the angle with respect to the rotating shaft 63 and arranged in a radial or spiral shape. Thereby, the amount of the foreign matter G transferred to the crusher 1 is dispersed, the large amount of foreign matter G on the crusher 1 is suppressed from being processed at one time, and the inclusion of the foreign matter G in the crusher 1 is suppressed. can do. At this time, a plurality of rakes 61 may be a rake group, and the rake groups may be fixed by shifting the angle. This makes it possible to reduce the power of scraping the foreign matter G.

The drive unit 64 of the rotary rake unit 6 drives the rotary shaft 63 to rotate. Further, the drive unit 64 has a function of performing, in addition to the normal rotation operation in which the foreign matter G is transferred to the crusher 1 side, a reverse rotation operation in which the normal rotation operation and the reverse rotation direction are performed. The drive unit 64 is not particularly limited as long as it can drive the rotary shaft 63 to rotate. For example, as in the drive unit of the crusher 1, it is possible to use a vertical electric motor.
Further, the drive unit 64 of the rotary rake unit 6 drives so that the rotational speed of the tip of the rake 61 becomes slower than the rotational speed of the outer periphery of the rotary crushing blades 13a and 13b of the crusher 1. For example, it is preferable that the rotation speed of the tip of the rake 61 be 70% or less of the rotation speed of the outer circumference of the rotary crushing blades 13a and 13b of the crusher 1. As a result, the contaminants G scraped by the rake 61 are easily drawn into the crusher 1, and the contaminants G can be more efficiently and reliably transferred to the crusher 1.

The rotary rake unit 6 of the present invention may have any configuration as long as it can scrape the contaminants G captured on the screen 5 toward the crusher 1, and can be appropriately designed according to the shape of the screen 5. it can. For example, like the rotary rake unit 6 of the first embodiment, in addition to the configuration including the rotary shaft 63 and the rake 61, a chain with a rake attached, such as a circular rake unit 8 of a third embodiment described later, , A structure provided with a plurality of sprockets for orbiting the chain.
Unlike the rotary rake unit 6 of the first embodiment, the rotary rake unit 6 configured by the rotary shaft 63 and the rakes 61 radially attached from the rotary shaft 63 does not have a structure that meshes with a chain and a sprocket. Since it is a simple structure, there is an advantage that troubles such as foreign matter getting entangled in the rotary rake portion 6 are unlikely to occur.

As described above, by rotating the rotary rake unit 6 by the drive unit 64, the contaminants G captured on the screen 5 are scraped by the crusher 1 and the contaminants G are crushed by the crusher 1. You can

(Control unit (control device for crusher screen device))
The control unit 4 controls the operation of the screen unit 3. The control unit 4 controls the operation of the screen device 2A alone and is performed independently of the operation control of the crusher 1.
The control unit 4 may be directly connected to the screen unit 3 by wiring or the like, or may be indirectly connected to the screen unit 3 via a communication technique such as wireless communication.
The control unit 4 of the present embodiment includes a determination unit 41 that determines the operating state of the screen unit 3 and a screen unit operation control unit 42 that controls the operating state of the screen unit 3.

The determination unit 41 determines the operating state of the screen unit 3, and uses the determination result as a reference for controlling the operation of the screen unit 3. The operating state of the screen section 3 refers to whether or not the rotary rake section 6 is in an overloaded state due to the accumulation and entrapment of impurities G on the screen 5.
The means by which the determination unit 41 determines the operating state of the screen unit 3 is not particularly limited. For example, means for detecting that the screen 5 has bitten in a foreign substance such as the foreign matter G, means for detecting an increase in the output of the drive unit 64 of the rotary rake unit 6, and the like are included. Specifically, a mechanism for detecting the current value of the drive unit 64 of the rotary rake unit 6 may be provided and the operating state of the screen unit 3 may be determined based on the change in the current value. Since the current value is detected in a short time (1 second or less), the overload state of the rotary rake unit 6 can be instantly judged.
Further, the determination unit 41 has a function of receiving a driving command from the outside with respect to the crusher 100 with a screen or the screen unit 3, and makes a determination regarding the driving state of the screen unit 3 according to the content of the driving command from the outside. May be

The screen unit operation control unit 42 controls the operating state of the screen unit 3. The control of the operating state of the screen unit 3 refers to control of driving/stopping, deceleration/acceleration, and rotation direction of the rotary rake unit 6. The means for controlling the operating state of the screen portion 3 is not particularly limited. For example, means for controlling the output of the drive unit 64 of the rotary rake unit 6 by an on/off switch mechanism, an inverter, or the like can be given.

The configuration of the control unit 4 can be independent as the control device of the present invention. This control device can be applied to a screen device in an existing crusher with a screen. Accordingly, the screen device for a crusher and the method for operating the screen device for a crusher of the present invention can be provided by a simple mounting operation without updating the screen device.

(Operation control of crusher screen device)
The crusher screen device, the crusher screen device control device, and the crusher screen device operating method according to the present invention perform operation control according to the operating state of the screen unit 3.
Hereinafter, as an embodiment according to the present invention, a suitable operation control according to the operation state of the screen portion 3 will be illustrated and described. It should be noted that the description and flowchart of each operation control are merely examples of the embodiment, and are not limited thereto.

First, operation control when an overload is detected in the operation state of the screen unit 3 will be described with reference to FIGS. 2 to 4.
2 and 3 show (A) the start of reverse operation and (B) the time of removal of contaminants by the reverse operation of the screen device 2A during reverse operation. 2 and 3, the arrangement of the rake 61 in the rotary rake portion 6 is different.
Further, FIG. 4 shows a flowchart of the main operation control.

While the operation of the screen device 2A is started and the normal operation is performed, the determination unit 41 of the control unit 4 causes the output of the drive unit 64 in the rotary rake unit 6 to exceed the set value set as the normal operation, resulting in an overload. When it is determined that the state is in the state, the screen operation control unit 42 of the control unit 4 performs the reverse operation in which the rotation direction of the rake 61 of the rotary rake unit 6 is reversed. In addition, at this time, the operation of the crusher 1 shall be continued.
Then, as shown in FIGS. 2 and 3, the rotational rake unit 6 is rotated in the reverse direction on the basis of the time T1 when it is determined that the rake 61 is in the overload state, and the rake 61 is rotated counterclockwise in FIGS. 2 and 3. Let Note that, in FIGS. 2 and 3, the position of the rake 61 at the time point T1 is indicated by a chain line.
At this time, in order to remove the contaminant G that causes an overload, it is desirable to drive the rotary rake unit 6 so that the rake 61 comes into contact with the contaminant G from the direction opposite to that in the normal rotation operation.
For example, FIG. 2 shows the rotary rake unit 6 in which the rakes 61 a to 61 d are fixed with respect to the rotary shaft 63 by shifting the angles by 90 degrees for each gap of the screen 5. As shown in FIG. 2A, when the rake 61a is loaded by the foreign matter G and the overload state is detected by the determination unit 41, the reverse rotation operation is started based on this time T1. Further, as shown in FIG. 2(B), it is possible to remove the contaminant G by rotating the rake 61a one rotation (360 degrees) or more.
On the other hand, in FIG. 3, in the rotary rake unit 6, the rakes 61a and 61c are fixed to the rotary shaft 63 on the same plane with an angle of 180 degrees, and the rakes 61b and 61d are fixed on the same plane by 180 degrees. The rakes 61a and 61c and the rakes 61b and 61d are fixed by shifting the angles by 90 degrees, and are shown as being fixed. As shown in FIG. 3(A), when the rake 61a is loaded by the contaminant G and the overload state is detected by the determination unit 41, the reverse rotation operation is started based on this time T1. Further, as shown in FIG. 3B, by rotating the rake 61a by a half rotation (180 degrees) or more, it is possible to remove the contaminant G by the rake 61c on the same plane.

As shown in FIGS. 2 and 3, when the number of the rakes 61 on the rotation surface A of the rotary rake portion 6, that is, the number of the rakes 61 passing through one gap formed on the screen 5 is one, the rake 61 is The foreign substance G can be removed by rotating (1) (1) (360 degrees) or more. If the number of the rakes 61 on the rotation surface of the rotary rake unit 6, that is, the number of the rakes 61 passing through one gap formed on the screen 5 is two, the rake 61 is rotated more than a half rotation (180 degrees). By doing so, the contaminant G can be removed.

Therefore, by performing the reverse rotation operation of the rotary rake unit 6 at an angle of one rotation/(the number of rakes on the rotating surface) or more, it is possible to remove the contaminant G which is a factor of overload. Further, the reverse rotation operation of the rotary rake unit 6 may be performed at least one rotation/(the number of rakes on the rotation surface) or more, and the upper limit is not particularly limited.

When the structure of the rotary rake unit 6 is different in the number of the rakes 61 attached on each rotating surface, the minimum number of the rakes 61 on the rotating surface is required in order to surely remove the contaminant G. It is preferable to calculate the angle of the reverse rotation operation using the value. In addition, the determination unit 41 has a function of grasping the position of the foreign matter G accumulated on the screen 5, and uses the number of rakes 61 on the rotating surface at the position of the foreign matter G that has caused the overload to determine the reverse rotation angle. May be calculated. As a result, the overloaded state of the screen portion 3 can be eliminated by the minimum necessary reverse operation.

As shown in FIG. 4, as the reverse rotation operation of the screen portion 3, the reverse rotation operation of the rotary rake portion 6 is performed, and after the reverse rotation operation of a predetermined angle or more is completed, the normal rotation operation is returned to and the normal rotation operation is executed for a predetermined time. .. Then, after a lapse of a predetermined time, the operating condition of the screen unit 3 is judged again by the judging unit 41, and when it is judged that the overloaded condition of the screen unit 3 has been eliminated, the normal operation of the screen unit 3 by the screen unit operation control unit 42 Continue driving. On the other hand, when the determination unit 41 determines that the overloaded state of the screen unit 3 has not been eliminated, the screen unit operation control unit 42 executes the reverse rotation operation of the screen unit 3 again. Repeat this operation.

Further, as shown in FIG. 4, when the judgment unit 41 judges that the vehicle is in an overload state, the counter provided in the judgment unit 41 is activated. Further, it is determined whether or not the number of times it is determined to be in the overload state is a predetermined number (n times (n is an arbitrary number)) or more. At this time, if it is within n times, the screen device 2A returns to the normal operation. On the other hand, if it is n times or more, it is determined that it is difficult to eliminate the overload state by the reverse rotation operation, and the operation of the screen unit 3 is stopped. As a result, when the number of times overload is detected is within a predetermined number, it is possible to avoid immediately stopping the operation of the crusher with a screen 100 while eliminating the overloaded state of the screen unit 3 and continuing the crushing process. it can. Further, when the number of overload detections exceeds the predetermined number, the operation of the screen unit is stopped from the viewpoint of protecting the screen device 2. It should be noted that after the operation of the screen unit 3 is stopped, another means may be used to try to eliminate the overloaded state of the screen unit 3.

Further, the timer is started when the number of times that the determination section 41 determines that the overload state is present is the first time, and the screen is displayed even when the overload state is determined again before the reset time elapses. The operation of the part 3 may be stopped. As a result, it is possible to immediately detect a defect in the screen device 2 and take appropriate measures. When the reset time has elapsed, the counter and the timer are reset.

As described above, when the operating state of the screen portion 3 becomes an overload state, the reverse rotation operation of the rotary rake portion 6 of the screen portion 3 is performed at an angle of one rotation/(the number of rakes on the rotating surface) or more. Thus, it becomes possible to remove the contaminant G that is a factor of overload. In addition, after a certain period of time, the operating state of the screen unit 3 is determined, and when the overloaded state of the screen unit 3 is resolved, the operation of the screen unit 3 can be returned to normal operation and the crushing process can be continued. .. On the other hand, if the overloaded state of the screen portion 3 is not resolved, the reverse rotation operation is performed again. Further, when the overload state is detected a predetermined number of times or more, the operation of the screen unit 3 is stopped so that appropriate measures can be taken.

Further, by independently controlling the operation of the screen device 2A, the operation of the crusher 1 can be continued, and the crushing process of the contaminant G can be performed without reducing the processing efficiency of the crusher with a screen 100. Will be possible.

The operation control described above may be automatically executed by the control unit 4 as a control program, or may include a manual operation by an operator. From the viewpoint of reducing the labor of the worker, it is more preferable to use the automatic control by the control program. As a result, the number of times and time required for maintenance can be significantly reduced.

[Second Embodiment]
FIG. 5: is a schematic explanatory drawing which shows the structure of the screen device for crushers of the 2nd Embodiment of this invention.
The crusher screen device 2B of the second embodiment replaces the rake 61 of the crusher screen device 2A of the first embodiment with a rake 65 including a first inclined portion 66a and a second inclined portion 66b. is there. In addition, among the configurations of the crusher screen device 2B in the present embodiment, the description of the same components as those of the crusher screen device 2A in the first embodiment will be omitted.

When the rotary rake unit 6 is operated in the reverse direction, when the rake 65 is housed inside the screen 5, the rake 65 may be caught and the contaminant G may be drawn into the screen unit 3.
Therefore, as shown in FIG. 5, the shape of the rake 65 is such that the front surface portion (rear surface during normal rotation operation) during reverse rotation operation has the first inclined portion 66a and the second inclined portion 66a that intersect the outer peripheral surface of the screen 5 at an acute angle. It is preferable to provide the portion 66b. That is, when the rake 65 that operates in the reverse direction projects from the outer peripheral surface of the screen 5, the inclined portions 66a and 66b are inclined rearward in the traveling direction.

When the rake 65 is housed inside the screen portion 3, the foreign matter G is easily caught at the tip, and the action of drawing the inside of the screen portion 3 is strong. Therefore, it is preferable to reduce the inclination angle of the inclined portions 66a and 66b, but on the other hand, the action of entangling the foreign matter G is also reduced. Therefore, the inclination angle of the first inclined portion 66a formed at the tip of the rake 65 is made smaller, and the inclination angle of the second inclined portion 66b formed adjacent to the first inclined portion 66a is made larger than that of the first inclined portion. Is desirable. As a result, the first slanted portion 66a can prevent the foreign matter G from being caught, and the second slanted portion 66b can enhance the performance of entangling the foreign matter G.

FIG. 6 is an enlarged view of the crusher screen device 2B of the present embodiment. The inclined portions 66a and 66b will be described in detail with reference to FIG. As shown in FIG. 6, the rake 65 has a first inclined portion 66a and a second inclined portion 66b having different inclination angles with respect to the outer peripheral surface of the screen portion 3. In the present invention, when the outer peripheral surface of the screen portion 3 is curved, the angle (tilt angle) formed by the outer peripheral surface of the screen portion 3 and the inclined portion is formed by the tangent line T of the screen portion 3 and the inclined portion. Say the corner.

The inclination angle (α) of the first inclined portion 66a is not particularly limited, but is preferably 1 to 60°, particularly preferably 3 to 50°. When the angle is less than 1°, the angle (γ) formed with the second inclined portion 66b becomes small, so that the contaminant G is easily caught at the angle with the second inclined portion 66b, and when the angle exceeds 60°, Since the inclination angle becomes large, the foreign matter G is easily caught at the tip of the rake 65.

The inclination angle (β) of the second inclined portion 66b is not particularly limited, but is preferably 20 to 89°, particularly preferably 30 to 70°. When the angle is less than 20°, the effect of entanglement of the contaminant G is small, and the contaminant G may not be removed. On the other hand, when it exceeds 89°, the effect of drawing the contaminants G into the screen portion 2 is enhanced, and the contaminants G may flow into the screen portion 3.

The angle (γ) formed by the first inclined portion 66a and the second inclined portion 66b is not particularly limited, but is preferably 95 to 175°, particularly preferably 110 to 165°. When the angle is less than 95°, the foreign substance G is easily caught at the angle formed by the first inclined portion 66a and the second inclined portion 66b, and when the angle exceeds 175°, the first inclined portion 66a and the second inclined portion 66b. Since the inclined portions have substantially the same inclination angle, the effect of providing the first inclined portion 66a and the second inclined portion 66b is reduced.

In the present invention, the rake 65 of the rotary rake section 6 may be provided with three or more inclined sections. Considering the action of entanglement of the foreign matter G and transferring it to the upstream side of the screen 5, the action of preventing the foreign matter G from being drawn into the screen portion 3, and the like, two or more inclined portions having different inclination angles may be provided. preferable.

Furthermore, it is preferable that the inclined portions 66a and 66b of the rake 65 are formed in all the regions projecting from the outer peripheral surface of the screen portion 3 on the front surface portion of the rake 65 during reverse operation. This further prevents the contaminant G from being drawn into the screen portion 3.

In addition, in the crusher screen device 2B of this embodiment, the same operation control as in the first embodiment is performed.

In the screen device for a crusher according to the present invention, the structure of the screen portion and the installation when applied to the crusher with a screen have a structure and an arrangement capable of capturing and transferring impurities in a water channel. It is not particularly limited as long as it exists. For example, FIGS. 7 and 8 show another embodiment of the crusher with a screen according to the present invention.

[Third Embodiment]
FIG. 7: is a schematic explanatory drawing which shows the structure of the screen apparatus for crushers of the 3rd Embodiment of this invention.
In the crusher screen device 2C of the third embodiment, as the screen portion 30, a screen 7 having a long straight portion and a curved arc portion that are installed slanted in the downstream direction, and a chain to which a rake 83 is attached. 82, and two sprocket wheels 81a and 81b for driving the chain 82, and a circumferential rake section 8 having a drive section 84. It should be noted that, of the configurations of the crusher screen device 2C in the present embodiment, description of the same components as those of the crusher screen device 2A in the first embodiment will be omitted.

Like the third embodiment, the shredder with a screen 100 including the screen device 2C having the orbiting rake part 8 using the chain and the plurality of sprockets as the screen part 30 does not matter the width of the water channel R. Can be installed. Therefore, the crusher screen device is suitable for installation in the water channel R having a large width.

Regarding the operation control of the screen device 2C of the third embodiment, the same operation control as in the first embodiment can be performed.

[Fourth Embodiment]
FIG. 8: is a schematic explanatory drawing which shows the structure of the crusher screen apparatus of the 4th Embodiment of this invention.
The crusher screen device 2D of the fourth embodiment has a configuration installed inside the crusher 1 and one housing 9. Further, the housing 9 is provided with a concave fitting piece as a fitting mechanism 91 that can be simply installed in the water channel R. Note that, in FIG. 8, the structure related to the screen unit 3 in the fourth embodiment is the same as that of the screen device 2A in the first embodiment, but the structure is not limited to this. For example, the structure may be the same as that of the screen unit 3 in the second embodiment. Further, among the configurations of the crusher screen device 2D in the present embodiment shown in FIG. 8, description of the same components as those of the crusher screen device 2A in the first embodiment will be omitted.

Like the fourth embodiment, the screen device 2D arranged in the housing 9 provided with the fitting mechanism 91 is fitted with the concave fitting piece and the convex fitting piece provided on the side wall of the water channel R. By doing so, the crusher 100 with a screen can be simply installed in the water channel R.

Regarding the operation control of the screen device 2D of the fourth embodiment, the same operation control as that of the first embodiment can be performed.

The above-described embodiment shows an example of the crusher screen device, the crusher screen device control device, and the crusher screen device operating method. Crusher screen device according to the present invention, the control device of the crusher screen device and the operating method of the crusher screen device are not limited to the embodiments described above, the scope not changing the gist described in the claims Then, the crusher screen device, the crusher screen device control device, and the crusher screen device operating method according to the above-described embodiment may be modified.

For example, the screen device for a crusher of the present embodiment may be provided with a structure for forming a flow of water to be treated in the screen portion. For example, the side wall of the water channel may be provided with a slope. This makes it possible to form a flow of the water to be treated with respect to the screen portion and prevent the accumulation of impurities on the side wall-side bottom of the water channel. Further, there is a rake provided with a water flow guide plate that rotates together with the rotating shaft. As a result, a water flow can be formed from the rotary rake portion toward the screen side, and the contaminants captured by the screen are easily separated from the outer peripheral edge of the screen.
By providing the above structure, the contaminants captured by the screen device can be efficiently transferred to the crusher, and the crushing process of the contaminants can be performed more reliably.

Further, for example, the crusher screen device of the present embodiment may be provided with a plurality of screen portions. When a plurality of screen parts are provided, it is preferable that each screen part can be operated independently. As a result, the screen portions can be operated with a time difference, and the contaminants can be dispersed and transferred to the crusher, and the load on the crusher can be reduced.

Further, for example, the operation control of the screen device for the crusher of the present embodiment is performed independently of the operation control of the crusher, but the operation control of the screen device based on the operating state of the crusher is performed. Good. Accordingly, when there is an abnormality in the operating state of the crusher, it is possible to respond by controlling the operation of the screen device.

INDUSTRIAL APPLICABILITY The crusher screen device, the crusher screen device control device, and the crusher screen device operating method according to the present invention can be used for treating impurities in the water to be treated flowing through the water channel. Specifically, it can be used for capturing and crushing contaminants such as residue in a sand basin of a sewage treatment plant.

Further, the control device for the screen device for a crusher of the present invention is provided in the screen device of an existing crusher with a screen, so that the screen device for a crusher of the present invention can be simply installed without updating the entire device. Can be provided.

100 crusher with screen, 1 crusher, 11 inlet, 12 outlet, 13a, 13b rotary crushing blade, 2A, 2B, 2C, 2D screen device, 3,30 screen part, 4 control part, 41 judging part, 42 Screen unit operation control unit, 5 screens, 6 rotation rake unit, 61, 61a, 61b, 61c, 61d rake, 62 inclined surface, 63 rotation shaft, 64 drive unit, 65 rake, 66a first inclined surface, 66b second inclination Surface, 7 screen, 8 orbiting rake part, 81a, 81b sprocket, 82 chain, 83 rake, 84 drive part, 9 housing, 91 fitting mechanism, G contaminant, R waterway, R1, R2 side wall

Claims (5)

A screen device for a crusher that transfers contaminants to a crusher that crushes contaminants in a waterway,
A screen portion for transferring the contaminants,
A control unit for controlling the operation of the screen unit,
The screen portion comprises a screen for capturing the contaminants, and a rotary rake unit provided with a rake for scraping the contaminants captured by the screen,
The screen unit for a crusher, wherein the control unit, when detecting an overload on the screen unit, performs a reverse operation at an angle of one rotation/(the number of rakes on the rotating surface) or more in the screen unit. .. The control unit returns to the normal rotation operation after executing the reverse rotation operation, performs the reverse rotation operation again when an overload is detected after the normal rotation operation is performed for a predetermined time, and returns the normal rotation operation when the overload is not detected. The crusher screen device according to claim 1, wherein the rolling operation is continued. The screen device for a crusher according to claim 1 or 2, wherein the control unit stops the operation of the screen unit when the number of overload detections exceeds a predetermined number. A control device for the crusher screen device provided in the crusher screen device for transferring the contaminants to the crusher for crushing the contaminants in the waterway,
The crusher screen device includes a screen that captures the contaminants, and a screen unit that transfers the contaminants that includes a rotary rake unit that provides a rake to scrape the contaminants captured by the screen,
The control device includes a control unit that controls the operation of the screen unit,
The screen unit for a crusher is characterized in that, when an overload is detected in the screen unit, the control unit performs a reverse operation at an angle of one rotation/(the number of rakes on the rotating surface) or more in the screen unit. Control device. A method for operating a screen device for a crusher, which transfers contaminants to a crusher for crushing contaminants in a waterway,
The crusher screen device includes a screen unit that transfers the contaminants, and a control unit that controls the operation of the screen unit,
The screen portion comprises a screen for capturing the contaminants, and a rotary rake unit provided with a rake for scraping the contaminants captured by the screen,
When the screen portion detects an overload, the screen portion includes a step of performing a reverse rotation operation at an angle of one rotation/(the number of rakes on the rotation surface) or more, the operation of the crusher screen device. Method.

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