A tidal water level monitoring device and its operation method

Abstract

A tidal water level monitoring device and its operation method, including a mounting frame, a detection box, a float, and a pulling rope. A tension sensor and a wire winding wheel are provided inside the detection box; the detection box is fixedly connected to the mounting frame, the mounting frame is relatively fixed to the ground and is provided with a guiding groove, the float is placed in the guiding groove and can move up and down along the guiding groove; one end of the pulling rope is connected to the float, and the other end winds around the wire winding wheel after passing around a number of pulley groups and the tension sensor; the force condition of the float is obtained through the tension sensor, and according to the force condition of the float, the pulling rope is retracted and released through the wire winding wheel for adjustment. The present invention can detect the water level change of up to hundreds of meters by the way that the float floats to drive the pulling rope to detect the water level, so as to fully meet the tidal water level monitoring with large water level changes. Moreover, the accuracy of calculating the water level by calculating the length change of the pulling rope through an encoder can meet most usage requirements, and the cost is low and it is easy to maintain.

Description

Technical Field

[0001] The present invention relates to a tidal water level monitoring device and an operation method thereof, belonging to the technical field of tidal water level monitoring. Background Art

[0002] In tidal monitoring, it is very important to monitor the change of its water level. On the one hand, it can warn of the invasion of sea water, and on the other hand, it can also provide basic reference parameters for tidal power generation. Due to the large change of tidal water level, ordinary liquid level gauges cannot be used to detect the change of its water level. At present, generally pressure sensors are used to detect the water depth pressure, so as to judge whether the water level depth reaches the warning value. However, this method can only obtain basic warning value data and cannot realize the real-time detection of the remaining depth. In some environments with strict requirements, it is very important to know the change of tidal water level. At present, although there are corresponding resistive or capacitive liquid level gauges that can realize the detection of higher water levels, their costs are high, and they cannot realize the detection of water levels of dozens of meters. Summary of the Invention

[0003] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a tidal water level monitoring device and an operation method thereof, which can realize large water level monitoring.

[0004] The first object of the present invention is to provide a tidal water level monitoring device, which is characterized by including a mounting frame, a detection box, a float, and a pulling rope. A tension sensor and a wire winding wheel are arranged in the detection box; the detection box is fixedly connected to the mounting frame, the mounting frame is relatively fixed to the ground and is provided with a guide groove, the float is placed in the guide groove and can move up and down along the guide groove; one end of the pulling rope is connected to the float, and the other end is wound around the wire winding wheel after passing around several pulley groups and the tension sensor; the force condition of the float is obtained through the tension sensor, and according to the force condition of the float, the pulling rope is taken in and released and adjusted by the wire winding wheel.

[0005] Further, an airtight electrical cavity, a pressurizing cavity, and a water isolation cavity are sequentially arranged in the detection box from top to bottom. The wire winding wheel is arranged above the electrical cavity, the tension sensor is located in the electrical cavity, the pulling rope passes through the water isolation cavity, the pressurizing cavity, and the electrical cavity in sequence and is connected to the wire winding wheel, and a sealing ring is installed at the place where the pulling rope penetrates into the pressurizing cavity.

[0006] Further, a motor is also installed above the electrical cavity, and the motor drives the wire winding wheel to rotate forward or backward.

[0007] Further, an airbag is installed at the bottom of the detection box, and the airbag cavity of the airbag is communicated with the pressurizing cavity through a pressure replenishing pipe, and at least 3 atmospheres are maintained in the pressurizing cavity.

[0008] Further, an air valve is also installed above the electrical chamber. An air tank is also installed in the electrical chamber. High-pressure gas is stored in the air tank, and the interior of the air tank is communicated with the inlet of the air valve, and the outlet of the air valve is communicated with the pressurization chamber.

[0009] Further, a barometer and a water immersion sensor are installed in the pressurization chamber. The barometer is used to detect the air pressure in the pressurization chamber, and the water immersion sensor is used to detect whether there is water flooding in the pressurization chamber.

[0010] Further, the signal of the tension sensor is connected to the PLC. The signals of the barometer and the water immersion sensor are both input into the PLC. The air valve is an electrically controlled valve, and its control end is connected to the PLC. The control end of the motor is connected to the PLC. The PLC is installed in the electrical box, and the electrical box is installed in the electrical chamber. A wireless module and a power supply are also installed in the electrical box. The wireless module communicates wirelessly with external devices through an antenna. An antenna box is installed on the float, and an antenna is installed in the antenna box.

[0011] Further, the wheel set includes a first guide wheel, a second guide wheel, a water isolation guide wheel, a detection wheel, and a guide wheel. The guide wheel and the detection wheel are placed in the electrical chamber and are respectively located on the upper and lower sides of the tension sensor. The water isolation guide wheel is located in the water isolation chamber. The first guide wheel is installed at the float. The second guide wheel is installed outside the detection box. The stretching passes around the first guide wheel and the second guide wheel in sequence, enters the detection box, then passes around the water isolation guide wheel, passes through the pressurization chamber, and then passes around the detection wheel, the tension sensor, and the guide wheel in sequence, and finally winds around the winding wheel.

[0012] Further, one end of the detection wheel shaft is fixedly connected to the input shaft of the encoder. When the detection wheel shaft rotates, it drives the input shaft of the encoder to rotate synchronously, so as to detect the number of rotation circles and angles of the detection wheel. The signal of the encoder is connected into the PLC. By combining the number of rotation circles, angles, and rotation direction of the encoder, and the water level at the installation location of the detection box, the current water level of the float is judged.

[0013] The second object of the present invention is to provide an operation method for a tidal water level monitoring device. The feature is that when the water level rises, the float pulls the pull rope, the tension of the tension sensor is too large, and the signal is transmitted to the PLC. The PLC controls the motor to reverse to release the pull rope until the tension reaches the preset value. At this time, the displacement of the pull rope is calculated according to the number of rotation circles and angles of the encoder, and this displacement is the depth of the water level increase.

[0014] When the water level drops, the weight of the float will be applied to the pull rope in the form of gravity, and the pull rope will also be pulled. Once the tension value is less than the preset value of the tension sensor, the signal is transmitted to the PLC. The PLC controls the motor to rotate forward to wind up the pull rope until the preset tension value is reached. At this time, the length of the wound-up pull rope is the depth of the water level drop.

[0015] When the water level rises, the airbag is squeezed, thereby increasing the air pressure in the pressurizing chamber to prevent water from entering the pressurizing chamber; after the air pressure in the pressurizing chamber decreases, the barometer transmits a signal to the PLC, and the PLC controls the air valve to open, and the gas in the gas tank enters the pressurizing chamber for pressurization, so as to keep the air pressure in the pressurizing chamber within the preset range.

[0016] The beneficial effects of the present invention are:

[0017] Through the method of using the floating of the float to drive the pull rope to detect the water level, the present invention can detect the water level change of up to hundreds of meters, thus fully meeting the tidal water level monitoring with large water level changes. Moreover, the method of calculating the water level by calculating the change of the pull rope length through the encoder can meet the requirements of most uses with high precision, and has low cost and is easy to maintain, and is very suitable for the current tidal monitoring requirements. Description of the Drawings

[0018] Figures 1 - 2 is a schematic structural diagram of the present invention;

[0019] Figures 3 - 4 is a schematic structural diagram of the present invention after removing the vertical plate and the guide plate, where Figure 4 is a cross-sectional view at the central plane where the axis of the pressure compensation pipe is located;

[0020] Figures 5 - 7 is a schematic structural diagram of the interior of the detection box;

[0021] Figure 8 is a schematic structural diagram at the waterproof plate. Detailed Embodiments

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention.

[0023] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0024] Refer to Figures 1 - 8 , the tidal water level monitoring device of this embodiment includes a substrate 110 and a mounting rack composed of two parallel vertical plates 120. Both vertical plates are installed on the substrate 110, and the substrate 110 is installed in water or on the shore, as long as it is relatively fixed to the ground.

[0025] On each vertical plate 120, two mutually parallel guide plates 130 are respectively installed. Between the four guide plates 130, a guide groove 131 is formed. A float 210 is slidably installed in the guide groove 131. The float 210 can float on the water surface. An antenna box 310 is installed on the float 210, and an antenna is installed in the antenna box 310 for receiving and transmitting wireless signals.

[0026] A first rope pulling frame 220 is installed on the float 210. A first articulated ball 511 is installed on the first rope pulling frame 220 in a spherically rolling manner. Two mutually parallel first rope pulling frame plates 221 are also installed on the first rope pulling frame 220. First rope pulling shafts 611 are respectively installed at the upper and lower ends of the first articulated ball 511 between the two first rope pulling frame plates 221. First guide wheels 521 are respectively and circumferentially rotatably sleeved on the first rope pulling shafts 611. One end of a rope 410 passes through the two first guide wheels 521 and the first articulated ball 511 and then is assembled with the float 210.

[0027] The other end of the rope 410 passes through a second rope pulling frame 230 and then is installed in a detection box 250 and is connected and fixed to a winding wheel 560 and wound. The second rope pulling frame 230 is installed on the detection box 250. Two first rope pulling frame plates 231 are also installed on the second rope pulling frame 230. The two second rope pulling frame plates 231 are respectively assembled with a second rope pulling shaft 612. A second guide wheel 522 is circumferentially rotatably installed on the second rope pulling shaft 612. A second articulated ball 512 is installed on the second rope pulling frame 230 in a spherically rolling manner.

[0028] The rope 410 passes between the two second guide wheels 522 and the second articulated ball 512 and is slidably assembled with it (in the length direction).

[0029] An airbag frame 240 is installed at the bottom of the detection box 250. An airbag 420 is installed in the airbag frame 240. The top surface of the airbag 420 is adhesively fixed to the inner top surface of the airbag frame 240, and the inside of the airbag 420 is a hollow airbag cavity 421.

[0030] A motor plate 263, a sealing plate 262, and a waterproof plate 261 are sequentially installed in the detection box 250 from top to bottom. The sealing plate 262 and the waterproof plate 261 respectively seal and divide the inside of the detection box 250, thereby dividing the inside of the detection box 250 into a sealed electrical cavity 253, a pressurized cavity 252, and a water isolation cavity 251 from top to bottom. Two water isolation wheel shafts 620 are installed in the water isolation cavity 251. Water isolation guide wheels 530 are circumferentially rotatably sleeved on the water isolation wheel shafts 620. The rope 410 passes between the two water isolation guide wheels 530 to provide guidance for the movement of the rope.

[0031] A waterproof plate 261 is provided with a waterproof cylinder 440 mounted on the end face of the pressurizing chamber 252. A sealing ring 450 is installed inside the waterproof cylinder 440. A pull rope 410 passes through the waterproof plate 261 and the sealing ring 450 and is hermetically and slidably assembled therewith.

[0032] A barometer 322 and a water immersion sensor 321 are installed inside the pressurizing chamber 252. The barometer 322 is used to detect the air pressure inside the pressurizing chamber 252, and the water immersion sensor 321 is used to detect whether there is water flooding inside the pressurizing chamber. Signals from the barometer 322 and the water immersion sensor 321 are both input into a PLC. The PLC is installed inside an electrical box 330. A wireless module and a power supply are also installed inside the electrical box 330. The wireless module communicates wirelessly with external devices through an antenna. The wireless module in this embodiment adopts a ZigBee module. The power supply is used to supply power to all electrical devices and can be a battery, an AC-DC converter, etc.

[0033] The electrical box 330 is installed on a sealing plate 262. The airbag chamber 421 communicates with the pressurizing chamber 252 through a pressure replenishing pipe 430. At least 3 atmospheres are maintained inside the pressurizing chamber 252. This design can prevent water in the water isolation chamber 251 from passing through the sealing ring and entering the pressurizing chamber 252. Its principle is similar to turning a water cup upside down in water, thus avoiding water from entering the electrical chamber 253 after passing through the pressurizing chamber.

[0034] Two mutually parallel detection wheel shaft plates 271 are also installed on the sealing plate 262. The two detection wheel shaft plates 271 are respectively assembled with a detection wheel shaft 630 for circumferential rotation. A detection wheel 540 is non-rotatably sleeved on the detection wheel shaft 630. The pull rope 410 bypasses the detection wheel 540 and can drive the detection wheel to rotate circumferentially when the pull rope 410 moves. One end of the detection wheel shaft 630 passes through one of the detection wheel shaft plates 271 and is fixedly connected to the input shaft of an encoder 380. The housing of the encoder 380 is installed on this detection wheel shaft plate 271. When the detection wheel shaft 630 rotates, it can drive the input shaft of the encoder to rotate synchronously, thereby detecting the number of rotation turns and angles of the detection wheel shaft 630. Signals from the encoder 380 are connected into the PLC. Thus, the current water level of the float can be judged by combining the number of rotation turns, angles, and rotation direction of the encoder 380 with the water level at the installation location of the detection box.

[0035] The pull rope 410 is assembled with the winding wheel 560 after passing the tension sensor 340 and the guide wheel 550. The tension sensor 340 can be rotatably mounted on the tension shaft 341. The tension shaft 341 and the tension frame 710 can be rotatably mounted. The tension frame 710 is equipped with a tension frame plate 711. The tension frame plate 711 can be axially slidably mounted on the tension guide shaft 660. One end of the tension guide shaft 660 is mounted on the tension shaft plate 272. The tension shaft plate 272 is mounted on the inner wall of the detection box 250. The tension guide shaft 660 is mounted on the tension spring 810 located between the tension frame plate 711 and the tension shaft plate 272. The tension spring 810 is used to apply elastic force to the tension frame 710 to prevent the tension frame 710 from moving toward the tension shaft plate 272, so that the tension sensor 340 keeps the pull rope 410 tensioned. The signal of the tension sensor is connected to the PLC, and the PLC determines whether the pull rope is tensioned and whether it needs to be tightened or released according to the current tension of the tension sensor. Tighten the rope when the tension is too low and release the rope when the tension is too high.

[0036] The guide wheel 550 is rotatably mounted on the guide wheel shaft 640, the guide wheel shaft 640 is mounted on the guide wheel shaft plate 274, and the guide wheel shaft plate 274 is mounted on the motor plate 263; the motor plate 263 is also mounted with a motor 360, an air valve 350, and two winding wheel shaft plates 273, the two winding wheel shaft plates 273 are respectively rotatably assembled with the winding wheel shaft 650, and the winding wheel 560 is non-rotatably mounted on the winding wheel shaft 650. One end of the winding wheel shaft 650 passes through one of the winding wheel shaft plates 273 and is assembled with the second pulley 572. The second pulley 572 is connected to the first pulley 571 through a belt 570 to form a belt transmission mechanism. The first pulley 571 is sleeved on the motor shaft 361. One end of the motor shaft 361 is installed in the motor 360. After the motor 360 is started, it can drive the motor shaft to rotate in a circle. In this embodiment, the motor adopts a worm gear reduction motor, which has a self-locking function for the motor shaft. The motor of this embodiment has a motor driver, and the control end of the motor driver is connected to the signal end of the PLC for communication. The PLC can control the running state of the motor through the motor driver.

[0037] A gas tank 370 is also installed on the sealing plate 262. High-pressure gas is stored in the gas tank 370, and the gas tank 370 is connected to the inlet of the gas valve 350. The outlet of the gas valve 350 is connected to the pressurized chamber 252. The gas valve 350 is an electrically controlled valve, and its control end is connected to the PLC, so that its opening and closing can be controlled by the PLC. The gas valve of this embodiment adopts a solenoid valve.

[0038] When in use, the first articulated ball and the second articulated ball are at the same height and the tension sensor is at the preset tension value, which is the water level zero point or origin (the water level corresponding to the current second articulated ball needs to be added). When the water level rises, the float pulls the rope, the tension of the tension sensor is too large, and the signal is transmitted to the PLC. The PLC controls the motor to reverse and release the rope until the tension reaches the preset value. At this time, the number of circles and angles of the encoder can be converted into the displacement of the rope, and this displacement is the depth of the water level increase. When the water level drops, the weight of the float will be applied to the rope in the form of gravity, and the rope will also be pulled. Once the tension value is less than the preset value of the tension sensor, the signal is transmitted to the PLC, and the PLC controls the motor to rotate forward to reel in the rope until the preset tension value is reached. At this time, the length of the reeled rope is the depth of the water level drop. This method is very simple, low-cost, and can be adapted to water level detection of hundreds of meters. It is very suitable for monitoring environments with huge tidal water level differences.

[0039] When the water level rises, the airbag is squeezed, thereby increasing the pressure in the pressurized chamber to prevent water from entering the chamber. When the pressure in the pressurized chamber decreases, the barometer transmits a signal to the PLC, which controls the air valve to open, and the gas in the gas tank enters the pressurized chamber for pressurization, thereby maintaining the pressure in the pressurized chamber within a preset range.

[0040] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

[0041] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A tidal water level monitoring device, characterized in that, It includes a mounting frame, a detection box (250), a float (210), and a pulling rope (410). The mounting frame is composed of a base plate (110) and two parallel vertical plates (120). Both vertical plates are installed on the base plate (110). Two parallel guide plates (130) are respectively installed on each vertical plate (120). A guide groove (131) is formed between the four guide plates (130); a tension sensor (340) and a wire winding wheel (560) are provided in the detection box; the detection box is fixedly connected to the mounting frame, the mounting frame is relatively fixed to the ground, the float is placed in the guide groove and can move up and down along the guide groove; one end of the pulling rope is connected to the float, and the other end winds around the wire winding wheel after passing around several pulley groups and the tension sensor; the force condition of the float is obtained through the tension sensor, and according to the force condition of the float, the pulling rope is taken in and released for adjustment through the wire winding wheel; Inside the detection box, there are sequentially arranged from top to bottom a sealed electrical chamber (253), a pressurizing chamber (252), and a water isolation chamber (251). The wire winding wheel is arranged above the electrical chamber, the tension sensor is located in the electrical chamber, the pulling rope passes through the water isolation chamber, the pressurizing chamber, and the electrical chamber in sequence and then is connected to the wire winding wheel, and a sealing ring (450) is installed at the place where the pulling rope penetrates into the pressurizing chamber; A motor (360) is also installed above the electrical chamber, and the motor drives the wire winding wheel to rotate forward or backward; An airbag (420) is installed at the bottom of the detection box. The airbag chamber (421) of the airbag is communicated with the pressurizing chamber through a pressure replenishing pipe (430), and at least 3 atmospheric pressures are maintained in the pressurizing chamber; An air valve (350) is also installed above the electrical chamber. An air tank (370) is also installed in the electrical chamber. High-pressure gas is stored in the air tank, and the inside of the air tank is communicated with the inlet of the air valve, and the outlet of the air valve is communicated with the pressurizing chamber; A barometer (322) and a water immersion sensor (321) are installed in the pressurizing chamber. The barometer is used to detect the air pressure in the pressurizing chamber, and the water immersion sensor is used to detect whether there is water flooding in the pressurizing chamber; The signal of the tension sensor is connected to a PLC. The signals of the barometer and the water immersion sensor are both input into the PLC. The air valve is an electrically controlled valve, and its control end is connected to the PLC. The control end of the motor is connected to the PLC; the PLC is installed in an electrical box (330), and the electrical box is installed in the electrical chamber; a wireless module and a power supply are also installed in the electrical box. The wireless module communicates wirelessly with external devices through an antenna; an antenna box is installed on the float, and an antenna is installed in the antenna box.

2. The tidal water level monitoring device according to claim 1, characterized in that, The pulley group includes a first guide wheel (521), a second guide wheel (522), a water isolation guide wheel (530), a detection wheel (540), and a guiding wheel (550); the guiding wheel and the detection wheel are placed in the electrical chamber and are respectively located on the upper and lower sides of the tension sensor; the water isolation guide wheel is located in the water isolation chamber, the first guide wheel is installed at the float, and the second guide wheel is installed outside the detection box; the pulling rope passes around the first guide wheel and the second guide wheel in sequence, enters the detection box, then passes around the water isolation guide wheel, passes through the pressurizing chamber, and then passes around the detection wheel, the tension sensor, and the guiding wheel in sequence, and finally winds around the wire winding wheel.

3. The tidal water level monitoring device according to claim 2, characterized in that, One end of the detection wheel shaft is fixedly connected to the input shaft of the encoder (380). When the detection wheel shaft rotates, it drives the input shaft of the encoder to rotate synchronously, thereby detecting the number of rotations and angles of the detection wheel. The signal of the encoder is connected to the PLC. Based on the number of rotations, angles, and rotation direction of the encoder, combined with the water level at the installation location of the detection box, the current water level of the float is determined.

4. The operating method of a tidal water level monitoring device according to claim 3, characterized in that, When the water level rises, the float pulls the pull rope, the tension of the tension sensor is relatively large, and the signal is transmitted to the PLC. The PLC controls the motor to reverse and release the pull rope until the tension reaches the preset value. At this time, the displacement of the pull rope is calculated based on the number of rotations and angles of the encoder, and this displacement is the depth of the water level increase. When the water level drops, the weight of the float is applied to the pull rope by gravity, and the pull rope will also be pulled. Once the tension value is less than the preset value of the tension sensor, the signal is transmitted to the PLC. The PLC controls the motor to rotate forward to wind up the pull rope until the preset tension value is reached. At this time, the length of the wound pull rope is the depth of the water level drop. When the water level rises, the airbag is squeezed, thereby increasing the air pressure in the pressurizing chamber to prevent water from entering the pressurizing chamber. After the air pressure in the pressurizing chamber decreases, the barometer transmits the signal to the PLC, and the PLC controls the air valve to open, and the gas in the gas tank enters the pressurizing chamber for pressurization, so as to keep the air pressure in the pressurizing chamber within the preset range.

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