KR100859147B1 - Water level detecter of rubber dam - Google Patents

Abstract

In the water level detection device for measuring the fresh water level of the pneumatic movable beam, the buoyancy chamber 40 having the entrance 41 having the inclined surface 42 formed on the side of the movable beam is concrete-poured, and the buoy chamber 40 is provided. An axial rotary encoder 44 is installed inside, and a pinion 47 that engages with a rack 46 having a buoy 45 (浮標) fixed to the bottom of the shaft of the encoder 44 is installed. It is a water level detection device of a pneumatic movable beam, characterized in that.

Through the present invention, since the measurement capability is further improved than the conventional fresh water level measurement by the analog method, there is an effect of improving the standing and dobok operation ability of the movable beam.

Movable beam, level detector, digital, analog

Description

Water level detector of pneumatic movable beam

1 is a front view of an upstream side of a conventional pneumatic movable beam;

FIG. 2 is a detailed view of "A" shown in FIG. 1

3 is a front view of an upstream side of a pneumatic movable beam according to the present invention;

FIG. 4 is a detailed illustration of the buoyancy excerpt shown in FIG.

<Description of the symbols for the main parts of the drawings>

10: airbag

11: steel panel

12: supply pipe

13: ultrasonic water level meter

14: power distribution line

20: retaining wall

21: embankment

30: operation panel

31: Programmable Logic Controller

32: A / D conversion card (Analog to Digital Converter)

40: buoy

41: doorway

42: slope

43: cover

44: Encoder

45 buoy

46: rack

47: Pinion

The present invention relates to a water level detection device of a pneumatic movable beam which is a kind of river cross-section.

A beam refers to a river cross-section that is installed to maintain a constant level by intercepting rivers to obtain agricultural water, living water, and river maintenance water from flowing rivers, among which concrete anchorages literally cover concrete to block rivers. It is a beam (洑) is fixed fixedly installed without movement, and the movable beam in contrast to this is configured to deform the main body of the beam, by connecting the steel panel 11 and the air bag 10 to constitute a wear, the steel panel 11 The slope of) can be adjusted using pneumatic equipment.

The movable beam can maintain the water level at a certain level for the purpose of water intake and the water level can be arbitrarily adjusted according to the need for the construction of a hydrophilic environment space such as summer water play and the discharge discharge during flooding. In the water level control, when the amount of air supplied to the airbag 10 increases, the airbag 10 expands, the standing angle of the steel panel 11 increases, and the upstream freshwater level rises. When the air is discharged, the airbag 10 contracts. As the standing angle of the steel panel 11 is reduced, the freshwater level is lowered.

1 is a front view of an upstream side of a conventional pneumatic movable beam. As shown in FIG. 1, a pneumatic movable beam is installed between the retaining wall 20 and the retaining wall 20 supporting the slope of the bank 21, and is normally operated on the bank 21 side. It is provided with a seal to install the operation panel 30, the compressor and necessary piping therein.

In addition, on the retaining wall 20 or the embankment 21, an ultrasonic water level gauge 13 for detecting the fresh water level with ultrasonic waves is installed to control the fresh water level to be raised to the dangerous water level.

That is, the analog ampere current detected by the ultrasonic level meter 13 is sent to the PLC control device 31 of the operation panel 30 along the distribution line 14, and the measured measurement value and the predetermined reference constant are sent out. Compared with the above and standard sewer level values, if it is above the standard constant level, it is considered as a dangerous level, and immediately the operation beam is overturned to reorganize the upstream level to a stable level.

After the freshwater level detected by the ultrasonic water level 13 reaches the set standard sewer level, the movable beam is raised again to reduce the normal water level.

However, since the analog ampere current is transmitted as the water level measurement value in the ultrasonic water level gauge 13, the line resistance is affected by the line resistance or is unstable in the process of being transmitted to the PLC control device 31 along the distribution line 14 at a long distance. An error occurs in the initial detected freshwater value under the influence of the current, which makes it difficult to accurately control the current.

In addition, the conventional ultrasonic water gauge 13 is not only aesthetically good as it protrudes directly above the bank 21 as shown in FIG. 1, and has a problem of misinterpreting the surface of the deposit to a fresh water level during water level measurement.

Therefore, the present invention was devised to solve the above problems, but using the ultrasonic water level to detect the fresh water level of the movable beam, it is configured to be detected as a digital signal rather than an analog signal, the first measured value of fresh water level and PLC control device The error is not generated between the measured value and the measured value.

Hereinafter, with reference to the accompanying drawings, preferred configurations and effects that can achieve the object of the present invention will be described.

1 is a front view of an upstream side of a conventional pneumatic movable beam, and FIG. 2 is a detailed view of "A" shown in FIG. As shown in FIG. 1, the pneumatic movable beam is installed between the retaining wall 20 and the retaining wall 20 supporting the slope of the bank 21, and usually has an operation room on the bank 21 so that the operation panel 30 and Install the compressor and necessary piping.

In addition, the ultrasonic level meter 13 generates ultrasonic waves in the air on the retaining wall 20 or the bank 21 to measure the round trip time of the ultrasonic waves reflected from the surface of the water, and transmits the current freshwater level as an analog ampere current. ) To control the rise of freshwater level to dangerous level.

The upstream freshwater level detected by the ultrasonic water level gauge 13 is an analog ampere current, which is sent to the programmable controller 31 of the operation panel 30 and the A / D of the PLC controller 31. It is converted digitally by a conversion card 32 (Analog to Digital Converter).

The measured value of this digital method is compared with the preset reference constant and reference sewer value, and if it is above the reference constant, it is judged as a dangerous water level and the discharge angle is discharged by lowering the standing angle of the steel panel 11. In accordance with the signal of 31), the compressed air of the airbag 10 is discharged to the outside through the supply pipe 12, so that the standing angle of the steel panel 11 decreases and the discharge proceeds so that the water flow upstream of the movable beam is stably reorganized. will be.

After discharge for a certain time, the freshwater level detected by the ultrasonic level gauge 13 reaches a predetermined reference sewer level. It is determined that the upstream water flow is stable. The compressed air of the compressor is supplied back to the airbag 10 through the supply pipe 12 by the signal of the PLC control device 31, and the fresh water level is set to the predetermined normal water level. Will rise.

However, considering the water level value measured by the ultrasonic water level gauge 13 as shown in FIG. 2, the process is transmitted to the PLC controller 31 along the distribution line 14 connected to the operation panel 30. Due to the influence of line resistance or the influence of unstable current in the surroundings, an error occurs in the initial detected freshwater level, which prevents accurate control.

In addition, the A / D conversion card 32 of the PLC control device 31 is frequently required to be installed when installing the analog ultrasonic level gauge 13, but frequently exposed to the unstable current of the surroundings frequently breakdown As a problem of over and malfunction occurs, a buoyant equation using a digital encoder 44 (Encoder) as shown in Figs. 3 and 4 as a new alternative to solve the problems of the ultrasonic water gauge 13 and the A / D conversion card 32 We propose a level detection device.

That is, as shown in FIG. 3, but the buoyancy chamber 40 is constructed of concrete at the side end of the movable beam, the buoyancy chamber 40 is buried in the embankment 21 so that the exterior is not exposed as in the conventional protruding water level gauge.

The upper part of the buoy chamber 40 is provided with a cover 43 for maintenance, as shown in Figure 4, the lower portion is formed with an entrance 41 having an inclined surface 42 through which water flows in and out. The inclined surface 42 is inclined in order to prevent the entrance 41 is blocked due to the soil.

On the other hand, an axial rotary encoder 44 is provided inside the buoy chamber 40, which is known as a kind of digital rotation angle sensor. A pinion 47 (Pinion) engaged with the rack 46 (Rack) is provided on the axis of the encoder 44, and a buoy 45 (45) is fixed to the bottom of the rack 46.

The buoy 45 receives the force from the buoyancy of the flowing water introduced into the buoy chamber 40 and moves up and down according to the inflow amount. At this time, the buoy 45 and the fixed rack 46 are interlocked to perform a linear movement. As a result, the pinion 47 is rotated while the encoder 44, which is a rotation angle sensor, is rotated while the rotational movement is measured.

Considering that the encoder 44 is operated in a digital manner composed of a signal system of 0 and 1, PLC control of the initial upstream freshwater level measurement value is not affected by the line resistance of the power distribution line 14 or by the influence of the unstable current around. Since it can be sent as it is to the apparatus 31, it is possible to precisely control the standing and dotting state of the movable beam according to the fresh water level.

In addition, since the conventional analog ultrasonic level gauge 13 can be replaced by the mechanical configuration of the digital encoder 44, the rack 46, and the pinion 47, the A / D conversion card in the PLC controller 31 is replaced. (32) has the advantage that can be excluded.

As a result, the technical gist of the present invention is a water level detecting device for measuring the fresh water level of a pneumatic movable beam, in which the buoy chamber 40 in which an entrance 41 having an inclined surface 42 is formed on the side of the movable beam is concrete poured, An axial rotary encoder 44 is installed inside the buoy chamber 40, and the pinion 47 meshes with a rack 46 having a buoy 45 (浮標) fixed to the bottom of the encoder 44 shaft. (Pinion) is a water level detection device of a pneumatic movable beam, characterized in that installed.

As described above, in measuring the freshwater level upstream of the movable beam, as the digital encoder rotates due to the mechanical motion of the rack and pinion linked with the buoyancy of the flowing water, PLC control of the unchanged initial measured value is performed. Since it can be sent to the device, the measurement ability is further improved than the conventional fresh water level measurement by the analog method has the effect of improving the standing and dobok operating capacity of the movable beam.

Claims (1)

A pinion (47) (pinion) meshing with a rack (46) with a buoy (45) fixed to the bottom is installed on the shaft of the axial rotary encoder 44 to measure the fresh water level of the pneumatic movable beam. In the water level detection device, On the side of the movable beam, a buoy chamber 40 having a doorway 41 having an inclined surface 42 is cast in concrete, and the axial rotary encoder 44, pinion 47, and rack 46 are placed inside the buoy chamber 40. And buoy 45 is installed, the water level detection device of the pneumatic movable beam.

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