JP2024041126A - Dust removal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically perform forward rotation and reverse rotation of a screen, reduce the number of work steps, and efficiently remove dust from the screen.

SOLUTION: A dust removal device comprises: a carrying chain; a pair of upper and lower sprocket wheels driving the carrying chain; a screen provided in the carrying chain and driven to rotate together with the carrying chain to remove dust from a waterway; and a water level difference meter measuring a water level difference between an upstream side and a downstream side of the waterway across the screen. The dust removal device is provided with control means controlling forward rotation and reverse rotation of the screen via the sprocket wheel and the carrying chain. The control means calculates a water level difference between the upstream side and the downstream side of the waterway, and when the water level difference reaches a first predetermined value or more, performs forward and reverse alternating operation in which the forward rotation and the reverse rotation of the screen are alternately performed.

SELECTED DRAWING: Figure 2

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a dust removal device for removing dust from waterways.

Conventionally, a dust removal device disclosed in Patent Document 1 is provided with a screen for removing dust, and a technique is described in which the screen is reversed to remove adhering dust.

Japanese Patent Publication No. 59-26110

However, Patent Document 1 does not mention whether or not the screen is automatically reversed, and if the screen is manually reversed, an increase in the number of work steps would be a problem.

The present invention has been made in view of the above-mentioned problems, and its purpose is to automatically reverse the screen, reduce the number of work steps, and efficiently remove dust from the screen.

The present invention includes a carrying chain, a pair of upper and lower sprocket wheels that drive the carrying chain, a screen that is provided on the carrying chain and rotates together with the carrying chain to remove debris from waterways, and a screen that is placed between the screens. A dust removal device comprising a water level difference gauge that measures a water level difference between an upstream side and a downstream side of the waterway,
Control means is provided for controlling forward and reverse rotation of the screen via the sprocket wheel and the carrying chain, and the control means calculates a water level difference between the upstream side and the downstream side of the waterway, and also calculates the water level difference between the upstream side and the downstream side of the waterway. When the difference exceeds a first predetermined value, a forward/reverse alternating operation is performed in which the screen is alternately rotated forward and backward.

Therefore, it is possible to automatically reverse the screen, reduce the number of work steps, and efficiently remove dust from the screen.

FIG. 1 is an overall configuration diagram of a dust removal device in the present application. This is the operation flow of the screen.

Embodiments of the present invention will be described below.
[Embodiment 1]
(overall structure)
FIG. 1 is an overall configuration diagram of a dust removal device in the present application. The dust removal device 1 includes a pair of upper and lower sprocket wheels 10 and 20, a screen 30, and a carrying chain 40.

The upper sprocket wheel 10 is installed in the atmosphere and is rotated by the power of the power source 2 to drive the carrying chain 40. The lower sprocket wheel 20 is installed underwater in the waterway 50 and is driven by a carrying chain 40. Each sprocket wheel 10, 20 is supported by an axle 110, 210, respectively.

The screen 30 is a planar net substantially perpendicular to the flow of the waterway 50, and removes debris floating in the waterway 50. This screen 30 is provided on the outer circumferential side of the carrying chain 40 so as not to interfere with each sprocket wheel 10, 20 when the carrying chain 40 meshes with each other.

Further, the screen 30 is connected to a carrying chain 40 at both ends in the horizontal direction (both ends of the shafts 110, 210), and as the carrying chain 40 is driven and rotated, the screen 30 also moves and rotates. The upper sprocket wheel 10 is installed in the atmosphere, and the lower sprocket wheel 20 is installed underwater in a waterway 50.

The carrying chain 40 and the screen 30 rotate clockwise in FIG. 1 to capture debris on the upstream side of the waterway 50. The captured dust is removed into the atmosphere downstream. By moving and rotating the screen 30 and alternately going back and forth between the water and the atmosphere, it is possible to capture and remove dust in the waterway 50.

A water spray nozzle 60 is provided on the inner peripheral side of the carrying chain 40 and vertically below the upper sprocket wheel 10. The water nozzle 60 receives water from a pump (not shown) and sprays water onto the back side of the screen 30 to clean it and remove dust.

A water level difference gauge 70 is provided above the waterway 50. This waterway difference gauge includes an upstream side detection section 71 and a downstream side detection section 72, and measures the water level on the upstream side and downstream side of the waterway 50, respectively, with the carrying chain 40 in between. The measured water level is input to the control means 100, and the water level difference ΔH is calculated. The control means 100 drives the upper sprocket wheel 10 by controlling the power source 2 based on this water level difference ΔH, and rotates the screen 30 in the normal and reverse directions.

The drive source 2 is also provided with a torque limiter TL, which stops driving the upper sprocket wheel 10 and the carrying chain 40 via it when a predetermined load is applied. As a result, if the load on the device is excessive, such as when a large amount of dust adheres to the screen 30, the drive is stopped to prevent damage.

(Screen forward rotation, reverse rotation control)
A plurality of screens 30 are provided along the carrying chain 40, and some of them are always underwater in the waterway 50. Therefore, when dust adheres to the screen 30, the water flow in the water channel 50 is obstructed, and a water level difference ΔH occurs between the upstream side and the downstream side. If the screen 30 is rotated with dust attached, the water level difference ΔH will further increase, and the pressure difference between the upstream side and the downstream side will increase, and there is a risk that the screen 30 will be damaged.

Therefore, in the present application, when the water level difference ΔH becomes equal to or greater than the first predetermined value ΔH1, forward/reverse alternating rotation control is executed in which the screen is alternately rotated forward and backward (see Steps S5→S6 in FIG. 2). By repeating this forward and reverse rotation, the dust adhering to the screen 30 is removed in the water of the water channel 50, reducing the water level difference ΔH and reducing the risk of damage. Note that the first predetermined value ΔH1 is a preset value, and is determined in consideration of various conditions such as the strength of the screen 30.

Furthermore, if the water level difference ΔH is small, there is no need to rotate the screen 30 in the first place. Therefore, when a predetermined period of time has elapsed with the water level difference ΔH being low, the rotation of the screen 30 is stopped to reduce power consumption (see step S4 in FIG. 2).

(Screen operation flow)
FIG. 2 is a flowchart of control related to the operation of the screen 30. Based on this flowchart, the above-mentioned screen forward rotation and reverse rotation control is performed.

In step S1, the water level difference ΔH is measured, and the process moves to step S2.

In step S2, it is determined whether or not the water level difference ΔH is greater than or equal to a second predetermined value ΔH2. If YES, the process moves to step S3 and the screen 30 is rotated forward; if NO, the control ends. Note that the second predetermined value ΔH2 is a preset numerical value, and indicates a value at which it is determined that dust has adhered to the screen 30 and the flow of water from the upstream side to the downstream side in the waterway 50 is suppressed. . This second predetermined value ΔH2 is set to a value smaller than a first predetermined value ΔH1, which will be described later.

In step S3, the screen 30 is rotated forward, and the process moves to step S4.

In step S4, it is determined whether a predetermined time has elapsed with the water level difference ΔH being less than a second predetermined value. If YES, the water level difference is small and the control ends; if NO, the water level difference is large and the process moves to step 5.

In step S5, it is determined whether the water level difference ΔH is greater than or equal to a first predetermined value, and if YES, it is determined that the water level difference ΔH is excessive and the process moves to step S6. If NO, it is determined that the water level difference ΔH is not excessive, and the process returns to step S2, where it is determined again whether ΔH is equal to or greater than the second predetermined value.

In step S6, the water level difference ΔH is too large, and there is a concern that the screen 30 may be damaged due to the pressure difference between upstream and downstream, so the screen 30 is rotated forward and backward to remove dust from the water in the water channel 50, and the process moves to step S7. do. In this application, forward rotation and reverse rotation are performed three times each, but the number of times is not particularly limited. Further, in order to prevent damage to the device, the torque limiter TL is activated in step S6.
Note that the first predetermined value ΔH1 of the water level difference in step S5 is set to a larger value than the second predetermined value ΔH2 in steps S2 and S4 (for example, ΔH1=1500 mm, ΔH2=300 mm). As a result, if the water level difference ΔH is not excessive, the screen 30 is not rotated in the forward or reverse direction in step S6, so that unnecessary control is not performed, thereby improving efficiency.

In step S7, the rotation of the screen 30 is stopped, and the process moves to step S8.

In step S8, the cleaning pump for cleaning the screen 30 is operated for a predetermined period of time, and the process moves to step S9. This predetermined time is appropriately set according to the specifications of the dust removal device 1 and the amount of dust.

In step S9, the cleaning pump is stopped and the control is ended.

(effect)
(1) A carrying chain 40, a pair of upper and lower sprocket wheels 10, 20 that drive the carrying chain 40, and a screen 30 that is provided on the carrying chain 40 and rotates together with the carrying chain 40 to remove dust from the waterway 50. , in the dust removal device 1 including a water level difference gauge 70 that measures the water level difference ΔH between the upstream side and the downstream side of the waterway 50 with the screen 30 in between,
The control means 100 is equipped with a control means 100 that controls the forward and reverse rotation of the screen 30 via the sprocket wheels 10, 20 and the carrying chain 40, and the control means 100 controls when the measured water level difference ΔH is equal to or greater than a first predetermined value ΔH1. In this case, a forward/reverse alternating operation in which the screen 30 is rotated forward and backward alternately is performed (steps S5→S6 in FIG. 2).

Therefore, the forward and reverse rotations of the screen 30 are automatically performed, reducing the number of work steps and making it possible to efficiently remove dust from the screen 30.

(2) When the measured water level difference ΔH is equal to or greater than the second predetermined value ΔH2, the control means 100 performs forward direction operation in which the screen 30 is rotated in the forward direction for a certain period of time (steps S2→S3 in FIG. 2), After performing the forward direction operation, if the water level difference ΔH becomes equal to or greater than the first predetermined value ΔH1, the forward and reverse alternate operation is performed (steps S5→S6 in FIG. 2).

When the water level difference ΔH is small, there is no need to rotate the screen 30 in the first place. Therefore, when a predetermined period of time has elapsed with the water level difference ΔH being low, the rotation of the screen 30 can be stopped to reduce power consumption (FIG. 2: Steps S4→S7). This prevents the screen 30 from being rotated forward or backward unnecessarily, which is efficient.

1 Dust removal device 2 Power source 10 Upper sprocket wheel 20 Lower sprocket wheel 30 Screen 40 Carrying chain 50 Water channel 70 Water level difference gauge 100 Control means

Claims (2)

carrying chain and
a pair of upper and lower sprocket wheels that drive the carrying chain;
a screen provided on the carrying chain and rotated together with the carrying chain to remove dust from the waterway;
A water level difference meter that measures a water level difference between the upstream side and the downstream side of the waterway with the screen in between,
Control means for controlling forward and reverse rotation of the screen via the sprocket wheel and the carrying chain,
The dust removal device is characterized in that, when the measured water level difference exceeds a first predetermined value, the control means performs forward and reverse alternate operation in which the screen is alternately rotated forward and backward. The dust removal device according to claim 1,
The control means includes:
When the measured water level difference is equal to or higher than a second predetermined value, a forward direction operation is performed in which the screen is rotated in the forward direction for a certain period of time, and
After performing the forward direction operation, if the water level difference becomes equal to or greater than the first predetermined value, the dust removal device performs the forward and reverse alternate operation.

Images