JP2571467B2 - High-speed dust remover - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a high-speed dust removal apparatus for removing dust from seawater or river water, and more particularly to dust removal that can sufficiently cope with a large amount of dust temporarily generated. It relates to improvement of the structure of the device.

[Prior Art] Conventionally, in a commonly used dustproofing device, a waterway for taking cooling water such as an industrial waterway or a power plant is widely used. A link chain is provided on both sides, and a bar screen or a screen made of a wire mesh is erected perpendicularly or substantially perpendicularly to the flow direction for each link of the link chain, and by rotating this, dust caught on the screen is removed. Some have a structure that is removed outside the waterway.

4 to 6 show one embodiment of a conventional dust removing device,
FIG. 4 is an overall schematic view, FIG. 5 is a meshing state diagram showing a meshing state of a sprocket driving the dustproof device and the link chain,
FIG. 6 is a detailed vertical sectional view (a) and a front view (b) of a screen frame having a bucket portion.

In FIG. 4, 1 is an upper sprocket wheel, 2 is a lower sprocket wheel, 3 is both sprocket wheels,
The link chain 2, which is mounted endlessly on 2, has a screen frame having a bucket 21 which is attached to the link chain 3 at an angle and accommodates garbage trapped in the lower part, and 5 has a transmission chain 6 and a chain wheel 7 A motor for transmitting power to the upper sprocket wheel 1, 8 a shaft of the upper sprocket wheel 1,
Reference numeral 9 denotes a guide plate for guiding dust to the trough 10, reference numeral 11 denotes a housing of the dust removing device, reference numeral 12 denotes a flowing water channel, and an arrow F indicates a direction of flowing water. As shown in FIG. 6, the screen frame 4 is attached at every pitch of the link chain 3, and 14 is a screen main body, which is made of a wire rod or a plurality of rods arranged in a plow shape, and which removes dust and the like in running water. It is a member that blocks and scoops it up. Reference numeral 15 denotes an upper beam provided at the upper end of the screen main body 14. The upper beam 15 is formed of a flat plate having a wide end bent in accordance with the width of the water channel, and the center thereof is the center of the roller 3b of the link chain 3. , And the screen main body 14 is integrally fixed to a lower portion thereof via a mounting plate 16. Reference numeral 17 denotes a lower beam made of a flat plate provided at the lower end of the screen main body 14 and having a bent end. The lower beam 17 rotates above the upper beam 15 of the next screen frame 4 adjacent to the lower portion. The screen main body 14 is provided so as to be freely covered, and the screen main body 14 is integrally fixed thereto via a mounting plate 18. 19
Is a side plate for holding the screen body 14 from its side. The side plate 19 has a width larger than the link width of the link chain 3 as shown in FIG. Each is integrally fixed to the end face.
In other words, the side plate 19 and the upper beam 15 and the lower beam 17 form a frame (screen frame 4) for holding the screen main body 14. The frame is fixed to the link chain 3 by fixing the side plate 19 to the side surface of the link 3a with the bolt and nut 20. Reference numeral 21 denotes a garbage bucket portion composed of the lower beam 17 and the side plate 19. Incidentally, 23 is a spray pipe provided on the back of the descending screen 13, by spraying spray water on the back of the screen main body 14 as shown by a dashed line, to remove dust attached to the screen main body 14. Things. Therefore, dust and the like floating in the flow are first blocked by the screen main body 14 and scooped up by the dust bucket 21 with the rise of the link chain 3, and the dust bucket 21 containing the dust further rises and the upper sprocket 1 Levels at the top, then flips and descends.

Then, the garbage existing in the garbage bucket portion 21 falls due to its gravity, is guided by the outer surface of the garbage bucket 21 of the lower screen and the guide plate 9, and is discharged into the water channel 10. On the other hand, dust and the like adhering to the screen main body 14 are separated by spray water and discharged to the trough 10 via the outer surface of the dust bucket portion 21 of the lower screen and the guide plate 9 as described above.

The endless link chain 3 joined to the screen frame 4 configured as described above was normally driven and rotated at a constant rotation speed by an upper sprocket wheel 1 having approximately six teeth as shown in FIG. The L arrow indicates the link chain driving direction.

The operation of the conventional dust removing apparatus configured as described above will be described. When the dust remover is installed in the intake port for taking in seawater or river water in the state shown in FIG. 4 and the link chain 3 is driven by the motor 5 as a power unit, the dust in the flowing water comes into contact with the screen body 14 and drifts. When the screen frame 4 rises from the water, the dust is stored in the bucket 21 of the lower beam 17 due to the gravity of the dust itself. Thereafter, the upper sprocket 1 is meshed and rotated, and the dust stored in the bucket portion 21 of the lower beam of the screen frame 4 turned upside down is slid on the guide plate 9 and discharged to a predetermined trough 10 to be collected.

[Problem to be Solved by the Invention] In the dust removing device configured as described above, dust can be collected and eliminated without any hindrance to the inflow of ordinary dust, and clean water intake can be obtained. However, in a so-called emergency, when a large amount of trash such as masts is generated seasonally or temporarily,
At the normal ascending speed of the screen (for example, 3m / min)
The refuse cannot be sufficiently treated, so that flowing water cannot pass smoothly through the dust remover, and a large water level difference occurs before and after the dust remover, resulting in overload and equipment damage. As a countermeasure for this, a low-speed (3 m / mi
Equipment that can switch between n) and high speed (6m / min) was equipped, and when the water level difference exceeded a set value in an emergency, it was possible to switch from low speed operation to high speed operation. However, when the amount of garbage is extremely large, a difference in water level occurs in a short time, so that switching to high-speed operation often has no effect.

[Means for Solving the Problems] In order to solve the above problems, a high-speed dust removing apparatus according to the present invention is configured such that a screen frame provided with a dust collecting screen is joined to an endless link chain, A high-speed dust remover that drives the sprocket wheel through a pair of upper and lower sprocket wheels, a motor for driving the sprocket wheel is a variable speed motor, and a sensor that measures a water level difference between before and after the dust remover is provided. A control device is provided for controlling the rotational speed of the variable speed electric motor by changing the temporal change ratio of the rotational speed of the driving sprocket according to the temporal change ratio of the water level difference.

[Operation] In the dust remover of the present invention, the water level difference of the dust remover is measured every moment by a sensor, the motor for driving the sprocket is a variable speed motor, and the water level difference per minute time Δt is calculated. The rotational speed of the variable speed electric motor is controlled so that the time rate of change of the ascending speed of the sprocket, ie, Δv / Δt, also increases in accordance with the rate of change of the increment Δh, ie, Δh / Δt. Therefore, even if the dust suddenly increases in an emergency, the screen speed is increased accordingly, and the dust removing device can sufficiently cope with the dust.

[Examples] Hereinafter, examples of the present invention will be described in detail.

1 to 3 relate to the present invention, FIG. 1 is a block diagram of a control device, FIG. 2 is an explanatory diagram showing a state of a change in a water level difference before and after a dust remover, and FIG. It is explanatory drawing which shows the state of the screen driving speed controlled according to a change.

The high-speed dust remover of the present invention is characterized in that the motor driving the sprocket 1 is a variable speed motor, that a sensor composed of an ultrasonic sensor or the like is disposed before and after the dustproof device, and that the rotation of the variable speed motor is increased. Except for having a control device for controlling the number, the structure and configuration of the dust removing apparatus are the same as those of the conventional dust removing apparatus shown in FIGS. 4, 5, 6 (a) and (b). The description is omitted because it is the same as the example. Select a variable speed motor with a maximum screen speed of 16 m / min.

Next, the control device of the present invention will be described with reference to FIG.

As shown in FIG. 1, with respect to a water level difference (for example, 20 cm) of a set value set in advance in the setting device, information on the water level difference obtained from each water level of the sensors before and after the dust remover is used as current or voltage or the like. And enters the comparator. The measured value is compared with the set value by the comparator, and when the measured value exceeds the set value, it enters the controller constituted by the controller and the operating device, and the difference Δh from the previous measured value and two actual measurements are performed. The time change rate x = Δh / Δt of the water level difference calculated from the time difference Δt is obtained. As shown in FIG. 2, x = Δh / Δt is the change rate of the water level difference, and the value k · x (= k · Δh / Δt) obtained by multiplying the time change rate x by the proportionality constant k and the screen The operating speed v of the screen frame is determined by the controller so that the time rate of change y = Δv / Δt of the operating speed matches, and an instruction is transmitted to the next operating device. The control of the operation speed v of the screen frame is as follows.
Actually, the rotation speed N of the variable speed motor is increased or decreased. The operating device amplifies the electric signal by the amplifier based on the instruction from the controller, and transmits an operation command for increasing or decreasing the speed to the variable speed motor. A line with an arrow in the drawing indicates a signal flow.

In this way, after a certain period of time set by the timer elapses after the operation is changed, the water level difference by the sensor enters the comparator again and is compared with the set value, and the same operation is repeated thereafter. By the automatic control having the above-described feedback mechanism, it is possible to respond to an increase in the water level difference based on an increase in the amount of refuse due to disturbance during operation, increase the operation speed, and immediately respond to an emergency. That is, for example, as shown in FIG. 2, the water level difference changes with time, that is, the driving speed v of the screen changes with time and changes as shown in FIG. It can cope with a sudden change in the difference.

By the above operation, for example, the water level difference h as in FIG. 2 rises gradually, starting at time t ₁ gives an operation command of the speed increasing above a variable speed electric motor, these time intervals by set timer below Is continuously given by the feedback mechanism by automatic control, the subsequent water level difference h converges to a stable water level difference by drawing a two-dot chain line shown in FIG.
The shorter the timer setting time, the quicker the response, but the operation is unstable and the operation speed is not constant, and fluctuates up and down.Therefore, it is better to make it as long as possible considering the dust generation situation at the intake site. good. Usually, it is appropriately set within a range of 1 to 10 seconds.

[Effects of the Invention] In the present invention, the motor of the dust removal device is a variable speed motor, and a sensor for measuring a water level difference before and after the dust removal device is provided,
Since it is a high-speed dust remover equipped with a control device for changing the temporal change rate of the screen operation speed according to the temporal change rate of the obtained front and rear water level difference, it can sufficiently cope with a rapid rise of the water level difference. Since the screen operation speed is increased, trash treatment capacity is increased, and overload and damage to structural members due to a large difference in water level can be prevented. Therefore, the service life of the device is prolonged, the maintainability is improved, and the reliability of operation is improved.

[Brief description of the drawings]

1 to 3 relate to the present invention, FIG. 1 is a block diagram of a control device, FIG. 2 is an explanatory diagram showing a state of a change in a water level difference before and after a dust remover, and FIG. It is explanatory drawing which shows the state of the screen driving speed controlled according to a change. 4 to 6 show a conventional embodiment, FIG. 4 is an overall schematic view, FIG. 5 is a diagram showing a meshing state of a sprocket and a link chain, FIG. 6 shows details of a screen frame, and FIG. (A)
Is a side sectional view, and FIG. 6 (b) is a front view. 1 ... upper sprocket wheel, 2 ... lower sprocket wheel, 3,3x, 3y ... link chain, 3y ₁ ... link plate (outside), 3y ₂ ... link plate (inside), 3a ... link chain, 3b: roller, 4: screen frame (or bar frame), 5: motor, 6: transmission chain, 7: chain wheel, 8: shaft of upper sprocket wheel, 9: guide plate, 10 ... ... trough, 14 ... screen body, 15 ... upper beam, 16 ... mounting plate, 17 ... lower beam, 18 ... mounting plate, 19 ... side plate, 20 ... bolt nut, 21 ... bucket part, 23 ... Spray pipe.

Claims (1)

(57) [Claims] 1. A high-speed dust remover in which a screen frame having a screen for collecting dust is joined to an endless link chain, and the link chain is driven via a pair of upper and lower sprocket wheels. A variable speed electric motor, and a sensor for measuring a water level difference before and after the dust removing device, and a time change rate of the rotation number of the driving sprocket according to a time change rate of the water level difference obtained by the sensor. A high-speed dust remover comprising a control device for controlling the rotation speed of the variable speed motor by changing the speed.