JPH01167611A - Water level difference detecting device - Google Patents

Abstract

PURPOSE:To detect the water level difference between the upstream and downstream flows of a water gate by providing a couple of floats which are suspended rotatably on both ends of an arm whose center is supported rotatably and throwing those floats in water extending to the upstream and downstream flows of the water gate. CONSTITUTION:The lower end of an upstream water storage pipe 7 is connected to an upstream water pipe 5 and the lower end of a downstream water storage pipe 8 is connected to a downstream water pipe 6. The upstream-side float 9 and downstream-side float 10 are supported and suspended rotatably in both storage pipes from the arm 13 with an upstream suspension pin 11 and a downstream suspension pin 12. When the water level difference between the upstream and downstream flows increases, buoyance operating on the float 9 increases and the arm 13 rotates against the resistance of a weight 17. At this time, a pointer 18 comes to the front surface of a proximity switch and a current flows to an electromagnetic contactor to drive an electric motor 3b, thereby starting the operation of a dust removing machine 3.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a water level difference detection device for automatically operating a water gate, a dust remover, etc. by detecting the water level difference between upstream and downstream thereof.

(Prior art) Conventionally, this type of device uses ultrasonic waves to measure the upstream and downstream water levels separately, calculates the water level difference using a calculator, and compares it with a reference value to open/close the gate or remove the water. L! It was a command to stop operation of I4411, etc. Some methods use floats to measure the water level, but since the float position is detected electrically, electricity is still the main component, and both are very expensive. For this reason, small-scale water gates are not automated and are operated manually, and dust removers have been operated using tires to temporarily stop operation. Ta.

(Problems to be solved by the present invention) Needless to say, when the downstream water level is higher than the upstream water level, the water gate is fully closed to prevent backflow, even if the downstream water level is slightly low. In some cases, the system is fully opened to discharge water, and it is extremely difficult to do this reliably manually. In addition, in the case of a dust remover, if a timer is used, the machine will rotate even though there is no dust at all, and on the other hand, it will not operate even if there is a large amount of dust, resulting in an overload state at the start of operation and a relay. There were times when the system was activated and the system was unable to start operation, and the situation could hardly be described as self-driving.

In this way, the reason why automation is difficult is that the equipment is expensive, but this is also due to errors in the technical method of detecting water levels separately instead of directly detecting water level differences, and mechanical There was no innovation in the field, and everything depended on electrical technology.

Therefore, one object of the present invention is to rectify the above-mentioned problems of the prior art, thereby proposing a cheaper device and promoting complete automation.

(Means for Solving the Problem) In order to achieve the above object, the present invention provides a pair of substantially equal A float having buoyancy can be thrown into waterways upstream and downstream of water gates, dust removal ljl, etc. or into water leading to these, and a weight is attached to the L side of the float thrown into the water on the upstream side of the arm. This is a water level difference detection device for automatic operation of water gates, dust removers, etc.

(Function) Considering the above configuration, when the water level difference between upstream and downstream is small,
Due to the action of the weight, the arm tilts toward the float in the water on the upstream side (hereinafter referred to as the upstream side) and remains stationary against the stopper, but when the water level difference between upstream and downstream becomes large enough, the pair of floats The difference in buoyancy acting on the arm becomes equal to the resistance of the weight, and the arm begins to rotate. As this movement progresses, the difference in buoyancy between the pair of floats decreases, but the reduction in resistance due to the movement of the weight is greater than that, so once the interlocking movement begins, it progresses at once. Then, the arm tilts toward the float in the water on the downstream side (hereinafter referred to as the "downstream side"), and rests on the stopper. Therefore, when the arm detects that it has reached this position, it issues a command to open a water gate or to operate a dust remover.

When the arm is tilted downstream in this way, the upstream float is rising, the downstream float is sinking, and there is also the action of the weight, so the water level upstream and downstream is When the difference becomes smaller, a movement tilting to the upstream side occurs, and as the movement progresses, the increase in the acting force due to the movement of the weight becomes greater than the decrease in buoyancy, and the movement ends. Then, the arm tilts upstream again and comes to rest. Therefore, if the arm is a water gate, it is not in the open position, so it is closed.
If it is a dust remover, it will stop because it is not in the operating position. Therefore, the electrical detector only needs to detect whether the arm is in a predetermined position or not.
Very few electrical means are required.

(Example) A dust remover is provided with a screen 2 that extends from the bottom of the water to the air and crosses the device according to the present invention (the case where θ is applied. The dust remover 3 integrated with the dust remover 3 is left alone, and the water level difference detection device 4 according to the present invention is installed near the face.
In @3, an exercise machine 3b is driven by a power line 3a, two pairs of drive sprockets (3c) rotate, a chain 3d revolves, and several rakes 3e fixed to this rake scrape the dust on the front of the screen 2. However, in the middle of the power line 3a, an electric command from the outside causes the power line 3a to
An electric 81 contactor 3f is interposed to pass or cut off the current.

Now, to explain the water level difference detection device according to the present invention, first, it has an upstream water storage pipe 7 and a downstream water storage pipe 8 located in a waterway sufficiently far away from the screen 2 upstream and downstream. Both storage pipes 7.8 are arranged in parallel along the flow with appropriate intervals, and the lower end of the upstream water storage pipe 7 is connected to the upstream water pipe 5.

The lower ends of the downstream water storage pipes 8 are connected to the downstream water pipes 6, and the lower ends are near the bottom of the water channel and the upper ends are in the air. In both storage pipes, an upstream float 9 and a downstream float 1O are suspended with their upper ends rotatably supported by an arm 13 by an upstream suspension pin 11 and a downstream suspension bin 12, respectively. A main shaft 14 protruding from the center of the arm 13 at right angles in both directions is rotatably supported at an appropriate angle by a pair of bearings 15, and a weight support rod 1B protrudes upward from the upstream suspension bin 11 side of the arm 13. A weight 17 is attached to this in a freely adjustable manner, and a small-diameter needle-shaped pointer 18 protrudes from one end of the main shaft 14, and the front side is detected to be opposite to the tip of the pointer 18 when the arm 14 is tilted most downstream. A proximity switch 19 is attached, and this and the electromagnetic contactor 3f are connected by an electric wire 20. Further, it goes without saying that the upstream suspension pin 11, the main shaft 14, and the downstream suspension pin 12 are correctly spaced at equal intervals and are on a straight line.

The upstream float 9 and the downstream flow 10 each have float parts 9a, loa, and
A lid tube part 9b, lOb that covers the upper part of each storage tube, and a suspension part 9c on the upper part thereof.

10c, and the rotation angle of the arm 13 is appropriately limited by the lid tube portion coming into contact with the top of the storage tube. When the arm 13 is tilted upstream and stationary, the part of the weight support rod 1B to which the weight 17 is attached is vertical, and when the arm 13 is tilted downstream and stationary, the part of the weight support rod 1B is vertical. It has already been explained that the tip of the pointer 18 and the detection function part of the detector 18 are opposed to each other. The upstream float 9 and the downstream float 1O are made of the same material, and of course have the same dimensions.
The weight of item 7 will be discussed later.

Next, the effect will be explained. Considering the above configuration, when the water level difference between upstream and downstream is small, the arm 13 tilts toward the upstream side and remains stationary due to the action of the weight 17. Therefore, since the tip of the pointer 18 is not in a position facing the detector 18, no current is sent from the detector 18 to the electromagnetic contactor 3f, the contact is open, and the current in the power line 3a is cut off and the dust remover 3
has stopped.

However, as the water level difference between upstream and downstream increases, the buoyant force applied to the downstream float 9 increases, and the arm 13 begins to rotate overcoming the resistance of the weight 5117, but as the movement progresses, the The buoyant force of the upstream float 9, which acts as a force, decreases, and the buoyant force of the downstream flow 10, which acts as a resistance, increases. However, as will be explained in detail later, since the construction is such that the reduction in resistance due to the movement of the weight 17 is greater than that, the movement ends all at once, and the pointer 18 comes to the front of the proximity switch 19. A current flows from the proximity switch 19 to the electromagnetic contactor 3f via the electric wire 20, and in response to the signal, the contact closes and a power current flows through the power line 3a.
The electric motor 4113b is driven and the operation of the dust remover 3 is started.

When most of the dust is removed in this way, the water level difference between upstream and downstream becomes small again, and in this state, the upstream float 9 rises.

Since the downstream flow) 10 is sinking and there is also the action of the weight 17, the arm 13 begins to tilt toward the upstream side, and as the movement progresses, the buoyant force of the upstream float 10, which is the operating force, decreases. Although the buoyancy of the upstream float 9, which acts as resistance, increases, the operating force due to the movement of the bell 17 increases significantly, so the arm 13 tilts upstream at once, causing the pointer 18 to approach. Move away from the front of the switch 19, the contacts of the proximity switch 18 open and the current to the electromagnetic contactor 3f is cut off, and the signal causes the contacts of the electromagnetic contactor 3f to open and the current of the power line 3a is cut off, allowing the dust remover to 3 is stopped.

It goes without saying that by changing the weight of the weight 17, the water level difference h1 at the start of operation can be easily changed, and by changing the mounting position, the water level difference h2 at the time of stopping can be changed.

In the embodiment, the main shaft 14 is rotated integrally with the arm 13 for convenience, but the main shaft 14 may be fixed, and either one of the upstream and downstream floats may be directly thrown into the waterway. It's a good thing.

(Effects) As explained above, the device according to the present invention is simple and inexpensive, and moreover, operates reliably with a water level difference that is appropriate for the operation standard, so it is popular for automatic operation of water gates, dust removers, etc. Furthermore, it is useful for preventing accidents.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the apparatus of the present invention, and FIG. 2 is a plan view thereof. 1 - Waterway, 2 - Screen, 3 - Dust remover. 3a - power line, 3b - electric motor, 30 - drive sprocket, 3d - chain, 3e - rake, 3f - electromagnetic contactor, 4 - water level difference detection device, 5 - hill flow wood pipe. 6 - Downstream water pipe, 7 - Upper wave water storage pipe, 8 - Downstream water storage pipe, 9 - Upstream float. 9a ~ Float part, ebN lid tube spiral tube part 0 ~ Suspension part, 10
~Downstream float, 10a~Float part, tab-lid pipe part, 10c~Suspension part, 11~Upstream suspension pin, 12
~Downstream suspension bin, 13~Arm, 14~Main shaft, 15
~ Bearing, 18 ~ Weight support rod, 17 ~ Weight, 18 ~ Pointer, 18 ~ Proximity switch, 20 ~ Electric wire. Figure 2

Claims (1)

[Claims] A pair of floats having approximately equal buoyancy are rotatably suspended from both ends of an arm rotatably supported at the center at an appropriate angle, respectively. A water level difference detection device for automatic operation of a water gate, a dust remover, etc., which is inserted into water leading to the water gate, and has a weight attached above the float side inserted into the water on the upstream side of the arm.