JPH029846Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an operation control device for a sludge scraper equipped with a submerged sludge scraper installed in a water treatment facility or the like.

Conventionally, in order to protect the sludge scraper, this type of sludge scraper has a shear pin attached to the reducer in the drive device installed on the ground, which prevents excessive force from being applied to the sludge scraper. When the force is applied, the shear pin is cut and the drive device is disconnected from the sludge scraper.

However, in the protection device of the sludge collector using shear pins, the operation of the protection device varies depending on the manufacturing precision of the shear pin etc., and the operation error is large, and in some cases, the sludge There is a problem of damage to the scraper or drive device.

This invention was made in view of the above circumstances,
The purpose is to provide an operation control device for a sludge scraper that can not only smoothly control the movement of the sludge scraper but also reliably prevent damage or destruction of the sludge scraper or drive device. It is in.

To achieve this objective, the present invention detects the output of a scraping force detector that detects the scraping force of a submerged sludge scraping device by detecting the force applied to the traction rope, and the operation of the drive device. The drive device is controlled based on the detected output of the rotation detector.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

In the figure, 1 and 1' are submerged type (submersible trolley type) sludge scraping devices installed in the sedimentation tank A. A scraper S for scraping up sediment (sludge) 2 is attached. On one end side of the settling tank A, the sludge scraping devices 1 and 1' are connected to the ground at the outer peripheral edge of the settling tank A via two ropes (pulling ropes) 3 and 4. A drive device 5 is installed for towing the vehicle along the rail at the bottom of the vehicle.

In the drive device 5, a rotating mechanism 8 consisting of an electric motor 6 and a speed reducer 7 connects two rotating drums 11, 11' via a connecting mechanism 10 equipped with three gears 9.
are connected to each other. The two ropes 3 and 4 wound around this rotating drum 11
is guided by the sliding pulley 12 and fixed pulleys 13, 13 provided at predetermined positions outside the sedimentation tank A, and the fixed pulleys 14, 14 provided below the water surface of the sedimentation tank A, so that one of said one is submerged in water. The ropes 3 and 4 are connected to both sides of the sludge scraping device 1, and the ropes 3 and 4 are connected to the fixed pulley 1.
A fixed pulley (not shown) attached to the wall on the side opposite to the wall of sedimentation tank A where Nos. 4 and 14 are attached.
It is connected to both sides of the other submerged sludge scraping device 1' via. The ropes 3 and 4 connected to the other sludge scraping device 1' are fixed pulleys 14 and 14' provided below the water surface of the settling tank A, and a fixed pulley 13 provided at a predetermined position outside the settling tank A. ',1
3' and a sliding pulley 12', and is wound around the rotating drum 11'. Then, by operating the drive device 5, when one of the sludge scraping devices 1 moves from left to right in FIG. 2 in order to scrape up the sludge 2, the other sludge scraping device 1 ′ moves from right to left. Note that the rotation mechanism 8 may include a variable speed electric motor 6 or a variable speed reducer 7.
Rotating drums 11, 11' according to the load using
Rotation control is performed.

Rotation detectors 15 and 15' are provided on the rotation shafts of the rotating drums 11 and 11', respectively, for detecting the number of rotations.
are installed, and these rotation detectors 15, 1
5' is electrically connected to the control circuit 16.
Further, the sliding pulleys 12, 12' are provided with scraping force detectors 17, 1 such as load cells (load detectors).
7' is provided, and the scraping force detectors 17, 1
7' detects that the sliding pulleys 12, 12' slide in the left-right direction due to the force applied to the ropes 3, 4, and sends the detected value to the control circuit 16. The control circuit 16 includes the rotating drum 11,
The rotation mechanism 8 is controlled so that the rotation mechanism 11' rotates at a predetermined set rotation speed, and a signal is output to the display device 18. This display device 18 includes rotation detectors 15, 15'
and the outputs of the scraping force detectors 17, 17' are displayed on a display screen or printed out using a printer, and when the control circuit 16 detects an abnormality, a warning light or alarm is activated. A buzzer is used to notify the operator.

Next, the operation of the sludge scraper operation control device configured as described above will be explained.

When discharging the sludge 2 deposited at the bottom of the settling tank A, the rotating mechanism 8 is operated to remove the rotating drum 1.
Rotate 1 and 11'. In this case, assuming that the rotating drum 11 rotates in the direction in which the ropes 3 and 4 are wound up, the ropes 3 and 4 are wound around the rotating drum 11, and the sliding pulley 12, fixed pulleys 13, 13, 14, 14 One of the sludge scraping devices 1 is pulled to the right via the scraper S, and the scraper S scrapes up the sludge 2, and the other sludge scraping device 1' moves to the left, and the fixed pulleys 14', 14 ′、
The rotating drum 11' rotates in the opposite direction to the rotating direction of the rotating drum 11 via the sliding pulleys 12', and the ropes 3 and 4 wound around the rotating drum 11' are rotated. Pull out. At this time, the rotation speed of the rotary drums 11, 11' is detected by the rotation detector 15,
15' and sent to the control circuit 16,
The control circuit 16 controls the rotation mechanism 8 by comparing these detected values with predetermined set values.
The tractive forces applied to the ropes 3 and 4 detected by 7 and 17' are input. When the sludge 2 is scraped by one of the sludge scraping devices 1, the rotating mechanism 8 is reversely rotated to move the ropes 3 and 4 to the rotating drum 1.
Wind it up at 1'. When the ropes 3 and 4 are wound around the rotating drum 11', the lobes 3 and 4 wound around the rotating drum 11 are pulled out, and one of the sludge scraping devices 1 moves to the left, and the other sludge scraper moves to the left. The scraping device 1' moves to the right and scrapes up the sludge 2 with the scraper S. By repeating this operation continuously or intermittently, the sludge 2 deposited in the settling tank A can be discharged. At this time, the rotation of the rotating drums 11 and 11' is controlled according to predetermined setting values, so that the sludge 2 is scraped up and discharged smoothly, and the sludge scraped during the scraping process. Stop device 1, 1'
The traction force (raking force) applied to the raking force detector 17,
17' and display or record it on the display device 18, it is possible to estimate the accumulation state of the sludge 2 in the sedimentation tank A, and to remove the sludge that is submerged in the sedimentation tank A and whose operating status cannot be directly observed. The number of times the devices 1, 1' are operated and the number of mud removal operations can be set correctly.

Also, during the scraping process, the rotating drums 11, 11'
If the output of the scraping force detector 17 or 17' is lower than a certain value or 0 for a certain period of time even though the rope is rotating at the set value, it is determined that the rope 3 or 4 has broken. , the control circuit 16 stops the rotating mechanism 8 and outputs a signal to the display device 18 to issue an alarm. Therefore, secondary disasters or damage to equipment due to the cutting of the ropes 3 and 4 can be prevented.

Furthermore, during the scraping process, the rotating drums 11, 1
1' decreases and the output of the scraping force detector 17 or 17' that measures the traction force applied to the ropes 3, 4 becomes larger than a predetermined value, the control circuit 16 For example, it determines that an abnormal situation has occurred, such as the sludge scraping device 1 or 1' being derailed and being fixed between the pond walls, and stops the rotating mechanism 8 and outputs a signal to the display device 18. to issue an alarm. Therefore, damage or destruction of the sludge scraping device 1 or 1' or failure due to overload of the drive device 5 can be prevented. Moreover, above all, the control device with the rake force detectors 17, 17' and the rotation detectors 15, 15' is actuated by indirect detection means acting via the traction ropes 3, 4; The sludge scraper of the present invention can be easily operated and maintained since the sludge scraper of the present invention can be controlled by arranging it at a location outside the settling tank where it is easy to work.

3 and 4 show a second embodiment of the present invention, which differs from the first embodiment shown in FIGS. 1 and 2 in that the drive device 5 is installed in the canal. Also, fixed pulleys 19, 1 guiding the ropes 3, 4
Scraping force detectors 17, 17' are installed at the lower part of 9' via support stands 20, 20'. Note that 21 and 21' are fixed pulleys that guide the ropes 3 and 4, and the support stands 20 and 20' are
As shown in FIG. 4, it may be divided into two supports 20' to separately measure the traction forces on the ropes 3, 4, or only one support 20 may be used.
The operation control device for the sludge scraper constructed in this manner can provide the same effects as the first embodiment.

In addition, the scraping force detectors 17 and 17' are equipped with load cells that directly convert the force applied to the ropes 3 and 4 into electrical signals, and also receive the force applied to the ropes 3 and 4 with springs and detect the expansion and contraction of the springs. The movement may be electrically converted using a phototube, optical sensor, etc., and the installation location is not limited to the above embodiments as long as the force applied to the ropes 3 and 4 can be detected. For example, it may be installed at an appropriate location such as on the ground at the periphery of the sedimentation tank or inside the canal. Furthermore, the rotation detectors 15, 15'
The device is not limited to being mounted on the rotating shafts 1 and 11', and may be used as long as the operation of the drive device 5 can be detected.For example, the rotation of the electric motor 6 or the speed reducer 7 may be detected.

As explained above, the present invention is a raking force detector that detects the raking force of a submerged sludge raking device by detecting the force applied to the traction rope at the part of the sedimentation tank that protrudes from the water surface. Since the drive device is controlled based on the output of the rotation detector that detects the operation of the drive device and the output of the rotation detector that detects the operation of the drive device, it is necessary to visually check each detector because each detector is not submerged in water. This makes it easier to perform repairs and maintenance in the event of a breakdown, and there is no need for a watertight structure compared to when placed underwater, making the structure simpler.
Moreover, it is difficult to break down even when used for a long time, and the existing sludge scraper can be easily modified.In addition, it is possible to prevent damage or destruction of the sludge scraper or drive device, etc., and the sludge scraper This has the excellent effect of being able to reliably and smoothly control the operation of the device.

[Brief explanation of the drawing]

Figures 1 and 2 show the first embodiment of the present invention; Figure 1 is a side view, Figure 2 is a plan view, and Figures 3 and 4 show the second embodiment of the invention. 3 is a side view, and FIG. 4 is a plan view. 1, 1'... Sludge scraping device, 2... Sediment (sludge), 3, 4... Rope (traction rope), 5... Drive device, 12, 12'... Sliding pulley, 15, 1
5'... Rotation detector, 16... Control circuit, 17...
... Scraping force detector, 17'... Scraping force detector, 19,
19'... Fixed pulley, A... Sedimentation tank, S... Scraper.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A submerged sludge scraping device equipped with a scraper for scraping up sludge deposited in a settling tank and provided below the water surface of the settling tank, and running the sludge scraping device. A sludge scraper comprising a traction rope and a drive device for operating the traction rope,
a scraping force detector that is disposed on a portion of the traction rope that protrudes from the water surface of the sedimentation basin and detects the raking force of the sludge scraping device by detecting the force applied to the traction rope; , a sludge scraper comprising: a rotation detector that detects the operation of the drive device; and a control circuit that controls the drive device based on outputs of the scraping force detector and the rotation detector. operation control device. 2. The operation control device for a sludge scraper according to claim 1, wherein the scraping force detector is disposed on a sliding pulley that guides the traction rope. 3. The operation control device for a sludge scraping machine according to claim 1, wherein the scraping force detector is disposed below a pulley that guides the traction rope.