Dust removal device

Abstract

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

Description

Technical Field

[0001] The present invention relates to a dust removal device for removing dust in a water channel.

Background Art

[0002] Conventionally, in the dust removal device of Patent Document 1, a technique is described in which a screen for removing dust is provided and the screen is reversed to drop the attached dust.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in Patent Document 1, it is not described whether the screen is automatically reversed. If the reversal is manually performed, an increase in the number of working hours becomes a problem.

[0005] The present invention has been made by paying attention to the above problems, and the object thereof is to automatically reverse the screen, reduce the number of working hours, and efficiently remove dust from the screen.

Means for Solving the Problems

[0006] The present invention includes a carrying chain, a pair of upper and lower sprocket wheels for driving the carrying chain, a screen provided on the carrying chain and rotationally driven together with the carrying chain to remove dust in the water channel, a water level difference meter for measuring the water level difference between the upstream side and the downstream side of the water channel with the screen interposed therebetween, and in a dust removal device comprising: The positive of the screen via the sprocket wheel and the carrying chain Equipped with control means for controlling rotation and reverse rotation, The control means determines that the measured water level difference 2. Above the specified value In that case, The screen is rotated in the forward direction for a certain period of time, and after the forward direction operation, Determine whether a certain period of time has elapsed while the measured water level difference remains below a second predetermined value. If the water level difference becomes greater than or equal to the first predetermined value which is greater than the second predetermined value, By performing alternating forward and reverse rotation of the screen while the torque limiter is activated, Remove debris attached to the screen in the water of the waterway. That's what we decided. [Effects of the Invention]

[0007] Therefore, the screen can be automatically reversed, reducing the amount of work required and efficiently removing dust from the screen. [Brief explanation of the drawing]

[0008] [Figure 1] This is an overall diagram of the dust removal device in this application. [Figure 2] This is the screen operation flow. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described below. [Embodiment 1] (Overall structure) Figure 1 is an overall diagram of the dust removal device in this application. The dust removal device 1 comprises a pair of upper and lower sprocket wheels 10 and 20, a screen 30, and a carrying chain 40.

[0010] The upper sprocket wheel 10 is located 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 located in the water of the waterway 50 and is driven by the carrying chain 40. Each sprocket wheel 10 and 20 is supported by shafts 110 and 210, respectively.

[0011] The screen 30 is a planar net substantially orthogonal to the flow of the water channel 50, and removes dust floating in the water channel 50. This screen 30 is provided on the outer peripheral side of the carrying chain 40 and is designed not to interfere when each sprocket wheel 10, 20 and the carrying chain 40 mesh with each other.

[0012] Also, the screen 30 is connected to the carrying chain 40 at both horizontal ends (both ends of the shafts 110, 210), and the screen 30 moves and rotates as the carrying chain 40 is driven and rotated. The upper sprocket wheel 10 is provided in the atmosphere, and the lower sprocket wheel 20 is provided in the water of the water channel 50.

[0013] The carrying chain 40 and the screen 30 rotate clockwise in FIG. 1 and capture dust on the upstream side of the water channel 50. The captured dust is removed in the atmosphere on the downstream side. By alternately moving back and forth between the water and the atmosphere while the screen 30 moves and rotates, the dust in the water channel 50 can be captured and removed.

[0014] 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. This water spray nozzle 60 receives water supply from a pump not shown in the figure, sprays and washes water on the back side of the screen 30 to remove dust.

[0015] A water level difference meter 70 is provided above the water channel 50. This water channel difference meter includes an upstream detection unit 71 and a downstream detection unit 72, and measures the water levels on the upstream and downstream sides of the water channel 50 sandwiching the carrying chain 40 respectively. The measured water levels are input to the control means 100 and the water level difference ΔH is calculated. The control means 100 controls the power source ② based on this water level difference ΔH to drive the upper sprocket wheel 10 and perform forward and reverse rotations of the screen 30.

[0016] In addition, a torque limiter TL is provided in the drive source 2, and when a predetermined load is applied, the driving of the upper sprocket wheel 10 and the carrying chain 40 etc. via the same is stopped. Thereby, when a large amount of dust adheres to the screen 30 etc., when the load on the device is excessive, the driving is stopped to suppress breakage.

[0017] (Screen forward and reverse rotation control) A plurality of screens 30 are provided along the carrying chain 40, and some are always present in the water of the water channel 50. Therefore, when dust adheres to the screen 30, the water flow of 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 the dust adhering thereto, the water level difference ΔH will become even larger, and there is a risk that the pressure difference between the upstream side and the downstream side will increase and the screen 30 will be damaged.

[0018] Therefore, in the present application, when the water level difference ΔH becomes equal to or greater than a first predetermined value ΔH1, positive and reverse alternating rotation control for alternately performing the forward rotation and the reverse rotation of the screen is executed (refer to FIG. 2: steps S5→S6). By repeating this forward and reverse rotation, the dust adhering to the screen 30 is removed in the water of the water channel 50, the water level difference ΔH is reduced, and the risk of breakage is reduced. 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 etc.

[0019] In addition, 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 time has elapsed in a state where the water level difference ΔH is low, the rotation of the screen 30 is stopped to reduce power consumption (refer to FIG. 2: step S4).

[0020] (Screen operation flow) FIG. 2 is a flowchart of the control related to the operation of the screen 30. Based on this flowchart, the above-described screen forward and reverse rotation control is performed.

[0021] In step S1, the water level difference ΔH is measured, and the process proceeds to step S2.

[0022] In step S2, it is determined whether the water level difference ΔH is greater than or equal to the second predetermined value ΔH2. If YES, the process proceeds to step S3 and the screen 30 is rotated forward; otherwise, the control is terminated. The second predetermined value ΔH2 is a pre-set value that indicates that debris is adhering to the screen 30 and that the flow of water from the upstream to the downstream side in the waterway 50 is being suppressed. This second predetermined value ΔH2 is set to a value smaller than the first predetermined value ΔH1, which will be described later.

[0023] In step S3, the screen 30 is rotated forward, and the process proceeds to step S4.

[0024] In step S4, it is determined whether a predetermined time has elapsed while the water level difference ΔH is less than the second predetermined value. If YES, the control is terminated as the water level difference is small; if NO, the control proceeds to step 5 as the water level difference is large.

[0025] In step S5, it is determined whether the water level difference ΔH is greater than or equal to the first predetermined value. If YES, it is determined that the water level difference ΔH is excessive and the process proceeds 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 greater than or equal to the second predetermined value.

[0026] In step S6, the water level difference ΔH is excessive, and there is concern that the screen 30 may be damaged due to the pressure difference between the upstream and downstream sides. Therefore, the screen 30 is rotated in forward and reverse directions to remove debris in the water of the channel 50, and the process proceeds to step S7. In this invention, forward rotation and reverse rotation are performed three times each, but the number of times is not particularly limited. Also, to prevent damage to the device, the torque limiter TL is activated in step S6. Furthermore, 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). This ensures that if the water level difference ΔH is not excessive, the screen 30 does not rotate in the forward or reverse direction in step S6, thereby improving efficiency by avoiding unnecessary control.

[0027] In step S7, the rotation of screen 30 is stopped, and the process proceeds to step S8.

[0028] In step S8, the cleaning pump for cleaning the screen 30 is operated for a predetermined time, and then the process proceeds to step S9. This predetermined time is set appropriately according to the specifications of the dust removal device 1 and the amount of dust.

[0029] In step S9, the cleaning pump is stopped and the control is terminated.

[0030] (effect) (1) A debris removal device 1 comprising a carrying chain 40, a pair of upper and lower sprocket wheels 10, 20 that drive the carrying chain 40, a screen 30 provided on the carrying chain 40 and rotated together with the carrying chain 40 to remove debris from the water channel 50, and a water level difference meter 70 that measures the water level difference ΔH between the upstream and downstream sides of the water channel 50 with the screen 30 in between, The system includes a control means 100 that controls the forward and reverse rotation of the screen 30 via sprocket wheels 10, 20 and a carrying chain 40. The control means 100 performs alternating forward and reverse rotation of the screen 30 when the measured water level difference ΔH becomes greater than or equal to a first predetermined value ΔH1 (steps S5 to S6 in Figure 2).

[0031] Therefore, the forward and reverse rotation of the screen 30 can be performed automatically, reducing the amount of work required and efficiently removing dust from the screen 30.

[0032] (2) When the measured water level difference ΔH becomes equal to or greater than a second predetermined value ΔH2, the control means 100 performs forward rotation of the screen 30 for a certain period of time (steps S2 to S3 in Figure 2). After performing forward rotation, when the water level difference ΔH becomes equal to or greater than a first predetermined value ΔH1, it performs alternating forward and reverse rotation (steps S5 to S6 in Figure 2).

[0033] When the water level difference ΔH is small, there is no need to rotate the screen 30 in the first place. Therefore, if a predetermined time has elapsed with a low water level difference ΔH, the rotation of the screen 30 can be stopped to reduce power consumption (Figure 2: Step S4 → S7). This prevents the screen 30 from rotating unnecessarily in forward and reverse directions, making it efficient. [Explanation of Symbols]

[0034] 1 Dust removal device 2 Power source 10 Upper sprocket wheel 20 Lower sprocket wheel 30 screens 40 Carrying Chains 50 waterways 70 Water level gauge 100 Control means

Claims

[Claim 1] Carrying chain and A pair of upper and lower sprocket wheels that drive the aforementioned carrying chain, A screen provided on the aforementioned carrying chain, which is rotated together with the carrying chain to remove debris from the waterway, A water level difference meter measures the difference in water levels between the upstream and downstream sides of the waterway, with the aforementioned screen in between. In a dust removal device equipped with, The system includes control means for controlling the forward and reverse rotation of the screen via the sprocket wheel and the carrying chain, When the measured water level difference becomes equal to or greater than a second predetermined value, the control means The screen is rotated in the forward direction for a certain period of time during forward operation. After performing the aforementioned forward-direction operation, Determine whether a certain period of time has elapsed while the measured water level difference remains below a second predetermined value. If the water level difference becomes greater than or equal to the first predetermined value which is greater than the second predetermined value, By performing alternating forward and reverse rotation of the screen while the torque limiter is activated, Remove debris attached to the screen in the water of the waterway. A dust removal device characterized by the following.

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