CN205228551U - Surface runoff monitoring devices with adjustable - Google Patents

Abstract

The utility model discloses an adjustable surface runoff monitoring device, which relates to the technical field of water and soil conservation monitoring. The device consists of five parts: header box (1), adjustable triangular weir (2), liquid level sensor (3), data processor (4) and upper computer (5). There is a triangular weir (11) on the front of the collecting box (1), and a drainage hole (12) on the back; the adjustable triangular weir (2) is fixed at the triangular weir (11) on the front of the collecting box (1). The stepper motor controller (24) of the triangular weir (2) is connected to the data processor (4); the liquid level sensor (3) is fixed on the top cover of the header tank (1), and the liquid level sensor (3) is connected to the data processing The device (4) is connected; the data processor (4) is connected with the host computer (5). The utility model can automatically adjust the included angle of the triangular weir, which is beneficial to expanding the runoff measurement range and improving the runoff measurement accuracy under different rainfall conditions, and is widely applicable to the field of water and soil conservation monitoring.

Description

Adjustable surface runoff monitoring device

technical field

The utility model relates to the technical field of soil and water conservation monitoring, in particular to an adjustable surface runoff monitoring device.

Background technique

Runoff monitoring is an important means to study the law of soil erosion and non-point source pollution. With the continuous development of monitoring technology, automatic runoff monitoring has become a development trend. Collecting tanks, liquid level sensors and weirs are common combination devices for runoff monitoring at present, and are widely used in open channel surface runoff monitoring due to the advantages of simple measurement methods and less sediment deposition. Among the weir mouths of different shapes, the application of triangular weirs is more common. The triangular weir is generally an inverted isosceles triangle, and its monitoring principle is to measure the liquid level of the section flowing through the weir through a liquid level sensor, and then calculate the fluid characteristics such as runoff and flow velocity according to empirical formulas.

At present, most runoff monitoring devices use fixed weir openings. For example, a triangular weir slope area runoff flow measurement system proposed in Chinese Patent No. 201110249797, the angle between the triangular weir openings is fixed at 30°. Due to the temporal and spatial differences in runoff distribution, there may be large differences in runoff in the same runoff plot under different rainfall conditions or in different runoff plots under the same rainfall condition. During the rainy season, the runoff variation is particularly significant. Therefore, fixed weirs cannot meet the requirements of large runoff changes. It is necessary to match a suitable weir according to the runoff to avoid too small or too large water head on the weir and improve the accuracy of runoff measurement.

Chinese patent number 201220030903 proposes a plug-in surface runoff measurement device and system, but since the plug-in weir plate involves various weir types such as triangular weirs, rectangular weirs, circular weirs, composite weirs or Parshall weirs, The workload of weir plate screening and on-site operation is increased, and the manual replacement of weir plate has a certain delay, and it cannot meet the automatic monitoring requirements for real-time changes in runoff.

Contents of the invention

The purpose of the utility model is to provide an adjustable surface runoff monitoring device. The device consists of five parts: a collecting box, an adjustable triangular weir, a liquid level sensor, a data processor and a host computer, and can be used to automatically and accurately monitor runoff under different rainfall conditions. The advantage is that by setting the fan-shaped movable weir plate and stepping motor, the automatic adjustment of the included angle of the triangular weir is realized, the runoff measurement range is effectively expanded, and the runoff monitoring accuracy under different rainfall conditions is improved.

In order to achieve the above object, the utility model adopts the following technical solutions:

The adjustable surface runoff monitoring device is composed of a collecting box, an adjustable triangular weir, a liquid level sensor, a data processor and a host computer; the collecting box is a rectangular box with a triangular weir on the front and a drainage hole on the back. The top cover is detachable; the adjustable triangular weir is fixed at the triangular weir on the front of the header tank, and the stepper motor controller of the adjustable triangular weir is connected to the data processor through a data cable; the liquid level sensor is fixed on the top cover of the header box , the liquid level sensor is connected to the data processor through the data line; the data processor is connected to the upper computer through the data line;

The adjustable triangular weir is composed of two fan-shaped movable weir plates, bearings, two stepper motors, stepper motor controllers and arc tracks; the center ends of the two fan-shaped movable weir plates are placed at the bearings, and the fan-shaped movable weir The arc-shaped end of the plate is placed on the matching arc-shaped track; two stepping motors are respectively fixed on the arc-shaped track on both sides, and the gear of the stepping motor is engaged with the gear at the arc-shaped end of the fan-shaped movable weir plate; the bearing is installed In the middle of the bottom of the triangular weir; two arc-shaped rails are respectively fixed on the front of the box and on both sides of the upper end of the triangular weir.

Advantage of the utility model:

Since the runoff generated in a single rainfall process has real-time change characteristics, it is difficult to accurately monitor the runoff under different rainfall conditions with a fixed angle triangular weir. The utility model solves the above problems by setting fan-shaped movable weir plates and stepping motors , the change of the runoff liquid level can be seen to realize the automatic adjustment of the included angle of the triangular weir, thereby effectively expanding the runoff measurement range of the monitoring device and improving the runoff monitoring accuracy under different rainfall conditions. The device is easy to operate, has a high degree of automation, enhances practicability, and is widely applicable to the field of water and soil conservation monitoring.

Description of drawings

Figure 1 is a schematic structural diagram of an adjustable surface runoff monitoring device.

Fig. 2 is a schematic diagram of the structure of the adjustable triangular weir of the adjustable surface runoff monitoring device.

Fig. 3 is a schematic front view of the collecting box of the adjustable surface runoff monitoring device.

Among them: 1 is the collecting box, 11 is the triangular weir mouth, 12 is the drainage hole, 2 is the adjustable triangular weir, 21 is the fan-shaped movable weir plate, 22 is the bearing, 23 is the stepping motor, 24 is the stepping motor controller, 25 is an arc track, 3 is a liquid level sensor, 4 is a data processor, and 5 is an upper computer.

detailed description

Below in conjunction with accompanying drawing, the utility model is further described:

The adjustable surface runoff monitoring device is composed of a collecting box 1, an adjustable triangular weir 2, a liquid level sensor 3, a data processor 4 and a host computer 5; the collecting box 1 is a rectangular box with a triangular weir opening 11 on the front of the box , there is a drainage hole 12 on the back, and the top cover is detachable; the adjustable triangular weir 2 is fixed at the triangular weir opening 11 on the front of the collecting box 1, and the stepping motor controller 24 of the adjustable triangular weir 2 communicates with the data processor through the data line 4 connection; the liquid level sensor 3 is fixed on the top cover of the header tank 1, the liquid level sensor 3 is connected to the data processor 4 through the data line; the data processor 4 is connected to the upper computer 5 through the data line;

The adjustable triangular weir 2 is composed of two fan-shaped movable weir plates 21, bearings 22, two stepper motors 23, stepper motor controller 24 and arc track 25; the center ends of the two fan-shaped movable weir plates 21 are arranged At the bearing 22, the arc end of the fan-shaped movable weir plate 21 is placed on the matching arc track 25; the two stepping motors 23 are respectively fixed on the arc track 25 on both sides, and the gears of the stepping motor 23 Engage with the gear at the arc end of the fan-shaped movable weir plate 21; the bearing 22 is placed in the center of the bottom of the triangular weir 11;

The outer sides of the two fan-shaped movable weir plates 21 are provided with sealing strips along the radial direction.

The liquid level sensor 3 is used to collect runoff liquid level information.

The data processor 4 is used to read and record the parameter information collected by the liquid level sensor 3, and calculate fluid parameters such as runoff flow rate and flow velocity according to the liquid level information.

The host computer 5 maintains real-time communication with the data processor 4 through the data line, batch processes and analyzes the data transmitted by the data processor 4 .

Work process of the present utility model is:

In this embodiment, the maximum included angle α of the triangular weir mouth 11 is set to 100°, and the range of the included angle of the triangular weir is set to 30-100°; the central angle β of the two fan-shaped movable weir plates 21 is set to 38° (35°*2 +30°=100°, satisfying 38°>35°), to ensure that when the actual included angle of the triangular weir mouth 11 is 30°, there is a 3° overlapping area between the fan-shaped movable weir plate 21 on both sides and the box body to enhance The tightness of the triangular weir. The sub-step angle of the single fan-shaped movable weir plate 21 of this device is set to 5°, that is, the sub-step angle of the included angle of the triangular weir opening 11 is 10° (5°*2=10°), and the included angle of the triangular weir is divided into 30°, 40°, 50°, 60°, 70°, 80°, 90° and 100° in 8 levels. The actual included angle of the triangular weir mouth 11 adjusted by the fan-shaped movable weir plate 21 is expressed as α' , and when the actual included angle is adjusted to the maximum value, then α=α' . Set the best measurement range of the liquid level sensor as [ h _l , h _u ].

Place the adjustable surface runoff monitoring device at the runoff confluence of the runoff area (such as the bayonet) to ensure that the runoff can enter the collection box 1 through the drainage hole 12 . When it rains, when the runoff liquid level reaches the lower limit of the optimal measurement range ( h _l ) corresponding to the minimum included angle of the triangular weir opening 11, the liquid level sensor 3 detects the runoff signal and starts to work, and the data processor 4 corresponds to the minimum included angle of the triangular weir opening 11. The empirical formula for calculating runoff. When the runoff liquid level changes and reaches the upper limit of the optimal measurement range ( hu ₎ of the preset included angle of the triangular weir mouth 11, the data processor 4 transmits the signal to the stepper motor controller 24, and the stepper motor controller 24 controls the left and right Two stepping motors 23 drive the left and right two fan-shaped movable weir plates 21 to move synchronously by 5° counterclockwise and clockwise, respectively, so that the actual included angle of the triangular weir mouth 11 is increased by 10°; when the runoff liquid level reaches the preset clip of the triangular weir mouth 11 When the angle is at the lower limit of the best measurement range ( h _l ), the fan-shaped movable weir plates 21 on both sides are driven by the stepping motor 23 to move clockwise and counterclockwise respectively, so that the actual included angle of the triangular weir mouth 11 is reduced by 10°. If it is adjusted once and the runoff liquid level is not in the best measurement range of the corresponding angle, the data processor 4 continues to transmit signals to the stepper motor controller 24, and the stepper motor 23 continues to drive the fan-shaped movable weir plate 21 to move until the runoff The liquid level is within the optimum measurement range of the corresponding included angle.

Claims (3)

1. adjustable rainwash monitoring device, is characterized in that: this device is made up of manifold (1), adjustable triangular weir (2), liquid level sensor (3), data processor (4) and host computer (5); Manifold (1) is rectangular box, and casing front has triangle crest of weir (11), and the back side has conduction hole (12), and top cover is detachable; Triangle crest of weir (11) place in manifold (1) front is fixed on adjustable triangular weir (2), and the controllor for step-by-step motor (24) of adjustable triangular weir (2) is connected with data processor (4) by data line; Liquid level sensor (3) is fixed on manifold (1) top cover, and liquid level sensor (3) is connected with data processor (4) by data line; Data processor (4) is connected with host computer (5) by data line;

Described adjustable triangular weir (2) is made up of two pieces of sector movable weir plates (21), bearing (22), two stepper motors (23), controllor for step-by-step motor (24) and arc tracks (25); The center of circle end of two pieces of sector movable weir plates (21) is placed in bearing (22) place, and the arc tips of sector movable weir plate (21) is placed on the arc track (25) that matches with it; Two stepper motors (23) are individually fixed on the arc track (25) of both sides, the gear of stepper motor (23) and the engaged gears of sector movable weir plate (21) arc tips; Bearing (22) is placed in center, triangle crest of weir (11) bottom; Two arc tracks (25) are individually fixed in casing front, triangle crest of weir (11) both sides, upper end.

2. adjustable rainwash monitoring device according to claim 1, is characterized in that: described triangle crest of weir (11) angle is 30 °-100 °.

3. adjustable rainwash monitoring device according to claim 1, is characterized in that: outside two pieces of described sector movable weir plates (21), arrange sealing strip along radial direction.