Radial gate opening degree detection device based on gravitational acceleration detection

Abstract

A radial gate opening degree detection device based on gravitational acceleration detection comprises a gravitational acceleration detection unit, the gravitational acceleration detection unit is electrically connected with an MCU microprocessor through an A / D conversion module, and the MCU microprocessor is electrically connected with a PLC through an RS485 communication module; and the gravitational acceleration detection unit is arranged on a support arm of the radial gate and is used for detecting the gravitational acceleration component of the point parallel to the mounting surface and perpendicular to the axial direction of circular motion of the radial gate around the trunnion. Installation is convenient, the gravitational acceleration detection unit can be installed at any position of the gate support arm, site construction is facilitated, and the construction accident risk is reduced.

Description

Technical Field

[0001] This utility model relates to the field of arc gate opening detection technology, and in particular to an arc gate opening detection device based on gravity acceleration detection. Background Technology

[0002] An arc-shaped gate, or simply an arc gate, is a gate with a partially arc-shaped cylindrical water-retaining surface. The center of its supporting hinge is located at the center of the gate's circular motion. When the gate opens or closes, the gate body rotates around the supporting hinge. The arc gate body consists of three parts: the gate leaf, the supporting arm, and the supporting hinge, as shown in the attached diagram. Figure 1 , 2 As shown, all parts within the dashed circle except for the supporting hinge base belong to the arched door body.

[0003] The following are some common solutions for existing arc gate opening detection sensors:

[0004] 1. Auxiliary cylinder magnetostrictive displacement sensor;

[0005] 2. Wire rope displacement sensor;

[0006] 3. Ceramic piston rod type displacement sensor.

[0007] The aforementioned detection methods are essentially all linear displacement sensors, installed on the hydraulic cylinder of the gate drive system, directly or indirectly measuring the piston displacement. The gate opening is then obtained either by directly converting the piston displacement value or through on-site multi-segment measured opening and multi-point calibration interpolation calculation. These technical solutions all have many flaws in practical applications and are gradually becoming pain points in the industry. Some typical examples are listed below:

[0008] 1. The most significant problem with the auxiliary cylinder type is inaccurate opening measurement and large errors. This is especially problematic for dual-cylinder arc gates that require correction control. Often, correction fails when it should and incorrectly corrects when it shouldn't, frequently causing the arc gate to jam or triggering unexpected out-of-tolerance alarms, leading to malfunctions and shutdowns. The core component used in the auxiliary cylinder type is a magnetostrictive displacement sensor, which is mostly imported (from foreign brands such as Balluff and ASM), resulting in long lead times and high prices.

[0009] 2. For wire rope displacement sensors, floating objects in the water can easily get tangled in the wire rope, affecting measurement accuracy and even causing the sensor to fail or be damaged. The wire rope and related metal accessories will corrode faster when immersed in water for a long time, greatly shortening their service life.

[0010] 3. There are also wire rope type and built-in type, in which the wire rope for measuring piston displacement is built into the oil cylinder. Although this avoids the wire rope being exposed outside the oil cylinder and easily damaged, it brings new problems in the actual application of many hydropower stations. Once the internal wire rope breaks, the maintenance will be very troublesome, causing many users great distress.

[0011] 4. The ceramic piston rod measurement method is similar to the cumulative counting method of an incremental encoder. In the event of a sudden power outage, the current count data can easily be lost. During flood discharge, the violent shaking of the stopped gate causes the piston to vibrate, sometimes leading to miscounting by the counter and incorrect opening data. The graduation marks on the piston rod used for measurement and counting can become ineffective after being struck by heavy floating objects such as wood or other unexpected heavy objects in the water. Repairing this requires disassembling the entire cylinder piston and returning it to the factory for maintenance.

[0012] 5. In the cold season in the north, wire rope type sensors may freeze. If the gate is opened, the sensor fixed on the cylinder and piston will be instantly damaged by the strong traction force of the cylinder.

[0013] 6. All of the above-mentioned solutions involve cumbersome calibration, calculation, and debugging, and require a high level of skill, experience, and responsibility from the debugging personnel. If the debugging work is not done properly, the basic performance of the sensor cannot be demonstrated at all.

[0014] 7. All of the above solutions involve mechanical moving parts, and in harsh operating environments, it is difficult to guarantee long-term reliability and stability.

[0015] The above are not probabilistic analyses, but rather real and common problems and phenomena in the application scenarios of hydraulic gate hoists in the field of water conservancy and hydropower. Summary of the Invention

[0016] The technical problem to be solved by this utility model is to provide an arc gate opening detection device based on gravity acceleration detection, so as to solve the above-mentioned technical problem.

[0017] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: an arc gate opening detection device based on gravity acceleration detection, including a gravity acceleration detection unit. The gravity acceleration detection unit is electrically connected to an MCU microprocessor via an A / D conversion module, and the MCU microprocessor is electrically connected to a PLC programmable controller via an RS485 communication module. The gravity acceleration detection unit is installed on the support arm of the arc gate and is used to detect the gravity acceleration component at that point, which is parallel to the mounting surface and perpendicular to the axis of the arc gate's circumferential motion around the hinge. The integrated design of the gravity acceleration detection unit and electrical modules (A / D conversion, MCU microprocessor, RS485 communication module) allows for direct installation on the arc gate support arm, eliminating the need for mechanical moving parts (such as traditional cylinders or wire ropes). It can be installed at any position on the support arm, reducing on-site construction complexity and lowering the risk of accidents during high-altitude operations or mechanical installation. By directly correlating the detection of the gravity acceleration component with the arc gate's rotation angle, errors from traditional linear displacement conversions are avoided, improving measurement accuracy.

[0018] Preferably, a signal conditioning and hardware filtering unit is further provided between the gravity acceleration detection unit and the A / D conversion module. Adding a signal conditioning and hardware filtering unit between the detection unit and the A / D conversion module can filter out environmental noise, electromagnetic interference, and other noise.

[0019] Preferably, the RS485 communication module and the PLC programmable controller are further provided with a communication isolation and instantaneous overvoltage protection module.

[0020] Preferably, the communication protocol uses the Modbus-RTU protocol to transmit data to the PLC programmable controller.

[0021] Preferably, it also includes a 9-30VDC power supply, which is converted by a DC / DC converter after passing through a power protection module, and then supplies power to the entire device.

[0022] Preferably, the gravity acceleration detection unit is one or two.

[0023] Preferably, there are two gravity acceleration detection units, one on each side of the support arm. Using one or two detection units, or two units on each side of the support arm, allows for real-time comparison of acceleration data between the two sides. Even if a single sensor fails, the detection function can be maintained by the other sensor. This also allows for synchronous monitoring of both sides of the gate, assisting in correction control and preventing gate jamming or out-of-tolerance alarms.

[0024] Preferably, the gravity acceleration detection unit is encapsulated in a waterproof box. Encapsulation in a waterproof box meets the protection requirements of hydraulic engineering projects in humid, underwater, or rainy environments, extending the service life of the equipment.

[0025] Preferably, the gravity acceleration detection unit uses an ADXL206 gravity acceleration sensor.

[0026] This utility model provides a device for detecting the opening degree of an arc-shaped gate based on gravity acceleration detection, which has the following advantages:

[0027] 1. Easy to install: The gravity acceleration detection unit can be installed at any position on the gate arm, which facilitates on-site construction and reduces the risk of construction accidents.

[0028] 2. Since the core components of this utility model are all electronic components and there are no mechanical moving parts, it is very convenient to design a fully enclosed structure, which facilitates waterproof encapsulation and significantly improves the protection performance compared with the aforementioned main traditional opening detection sensors that have relative mechanical movement.

[0029] 3. Measurement accuracy has been significantly improved, especially in terms of stability and reliability, which represent a qualitative leap compared to the aforementioned traditional sensors.

[0030] 4. This sensor outputs absolute data, which is a relative incremental type. This is because the sensor's principle is based on the detection of gravitational acceleration, a physical quantity that exists independently of the sensor. Therefore, after a power outage, if the gate's position changes and power is restored, the sensor's gravitational acceleration detection unit can immediately detect the gravitational acceleration at the gate's current position and then immediately calculate the gate's opening at that position. Incremental sensors, on the other hand, rely on internal memory to record the current position in real time. After a power outage, if the gate's position changes and power is restored, only the position data from the moment before the power outage is available; the current position data cannot be immediately detected, requiring readjustment.

[0031] 5. The sensor opening degree is calculated automatically by the processor built into the opening degree sensor based on the preset physical dimensions of the specific arc gate. The output calculation result is the final opening degree value, which can be used directly by PLC or other Modbus master station equipment without the need for complex mathematical calculations and tedious multi-point calibration on site. This greatly reduces the programming difficulty of PLC and the probability of programming and calibration errors, significantly improves debugging efficiency, and greatly reduces equipment downtime.

[0032] 6. The gravity acceleration detection adopts a MEMS-based gravity acceleration detection element, which is small in size, impact-resistant, strong and easy to maintain, and can adapt to the harsh environment of water conservancy projects. Attached Figure Description

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0034] Figure 1 This is a schematic diagram of the structure of an existing arc-shaped gate;

[0035] Figure 2 This is a schematic diagram of the installation structure of an existing arc-shaped gate;

[0036] Figure 3 This is a schematic diagram of the structure of this utility model in use;

[0037] Figure 4 This is a schematic diagram illustrating the calculation principle of this utility model;

[0038] Figure 5 for Figure 4 A schematic diagram of the local acceleration at point A in the middle;

[0039] Figure 6 for Figure 4 A schematic diagram of the local acceleration at point B. Detailed Implementation

[0040] like Figure 3As shown, an arc gate opening detection device based on gravity acceleration detection includes a gravity acceleration detection unit. The gravity acceleration detection unit is electrically connected to an MCU microprocessor via an A / D conversion module. The MCU microprocessor is electrically connected to a PLC programmable controller via an RS485 communication module. The gravity acceleration detection unit is mounted on the support arm of the arc gate and is used to detect the gravity acceleration component at that point, which is parallel to the mounting surface and perpendicular to the axis of the arc gate's circular motion around the hinge. The integrated design of the gravity acceleration detection unit and electrical modules (A / D conversion, MCU microprocessor, RS485 communication module) allows for direct installation on the arc gate support arm, eliminating the need for mechanical moving parts (such as traditional cylinders or wire ropes). It can be installed at any position on the support arm, reducing on-site construction complexity and lowering the risk of accidents during high-altitude operations or mechanical installation. By directly correlating the detection of the gravity acceleration component with the arc gate's rotation angle, errors from traditional linear displacement conversions are avoided, improving measurement accuracy.

[0041] Preferably, a signal conditioning and hardware filtering unit is further provided between the gravity acceleration detection unit and the A / D conversion module. Adding a signal conditioning and hardware filtering unit between the detection unit and the A / D conversion module can filter out environmental noise, electromagnetic interference, and other noise.

[0042] Preferably, the RS485 communication module and the PLC programmable controller are further provided with a communication isolation and instantaneous overvoltage protection module.

[0043] Preferably, the communication protocol uses the Modbus-RTU protocol to transmit data to the PLC programmable controller.

[0044] Preferably, it also includes a 9-30VDC power supply, which is converted by a DC / DC converter after passing through a power protection module, and then supplies power to the entire device.

[0045] Preferably, the gravity acceleration detection unit is one or two.

[0046] Preferably, there are two gravity acceleration detection units, one on each side of the support arm. Using one or two detection units, or two units on each side of the support arm, allows for real-time comparison of acceleration data between the two sides. Even if a single sensor fails, the detection function can be maintained by the other sensor. This also allows for synchronous monitoring of both sides of the gate, assisting in correction control and preventing gate jamming or out-of-tolerance alarms.

[0047] Preferably, the gravity acceleration detection unit is encapsulated in a waterproof box. Encapsulation in a waterproof box meets the protection requirements of hydraulic engineering projects in humid, underwater, or rainy environments, extending the service life of the equipment.

[0048] Preferably, the gravity acceleration detection unit uses an ADXL206 gravity acceleration sensor.

[0049] like Figure 4 As shown, during the opening and closing process, the gate body rotates around the central axis of the supporting hinge, wherein:

[0050] H: Gate opening;

[0051] α: The rotation angle of the arched gate about the supporting hinge during the opening process;

[0052] α0: The angle between the line connecting the installation position of the opening sensor and the center of the supporting hinge and the horizontal line when the gate is closed;

[0053] α1: The inherent angle of the physical structure of the arc gate. This parameter is a constant and can be found in the corresponding arc gate mechanical drawing or calculated from other constants.

[0054] α2: The angle between the line connecting the lower edge of the arc gate and the center of the supporting hinge and the horizontal line. This angle changes as the arc gate moves. When the lower edge of the arc gate is below the horizontal line, the angle is negative and when the lower edge of the arc gate is below the horizontal line, the angle is positive.

[0055] r: is the radius of curvature of the arc gate. This parameter is constant and can be found in the corresponding arc gate mechanical drawing.

[0056] With these parameters, the following formula for the arc gate opening can be easily derived using basic trigonometric function knowledge [2].

[0057] [1]H=r*(sinα1+sinα2)

[0058] Where α2 = α – α1, from which we can obtain

[0059] [2]H=r*(sinα1+sin(α–α1))

[0060] The gravity acceleration detection unit is installed on the arch support arm. By detecting the change of the gravity acceleration component of the mounting point in the direction parallel to the mounting surface and perpendicular to the axis of the arch's circular motion around the hinge during the arch operation, the rotation angle of the arch operation is calculated, which is α in the above formula [2]. Thus, the arch opening H can be calculated through formula [2].

[0061] like Figure 5 As shown, a0: when the arched gate is in the closed position, the initial installation position of the opening sensor, and the gravity acceleration component detected by the gravity acceleration detection element is parallel to the installation surface and perpendicular to the axis of the arched gate's circular motion around the hinge.

[0062] From the knowledge of trigonometric functions, we know

[0063] ∠1 = arcsin(a0 / g), and ∠1 = α0, therefore we have

[0064] [3]α0=arcsin(a0 / g)

[0065] like Figure 6 As shown, it can also be known from the knowledge of trigonometric functions.

[0066] ∠2 = arcsin(a / g), and ∠2 = α + α0, therefore we have

[0067] α = ∠2 - α0 = arcsin(a / g) - α0

[0068] According to [3] α0=arcsin(a0 / g), therefore we have

[0069] [4]α=arcsin(a / g)-arcsin(a0 / g)

[0070] Combining the previous formulas [2][3][4], we can obtain the following formula.

[0071] [5] Gate opening H = r* [sinα1 + sin( arcsin(a / g) - arcsin(a0 / g) –α1 )]

[0072] In formula [5]:

[0073] a: Gravitational acceleration components detected by the gravity acceleration detection element, which are parallel to the mounting surface and perpendicular to the axis of the arc gate's circular motion around the hinge.

[0074] a0: When the arched gate is in the fully closed position, at the initial installation position of the opening sensor, the gravitational acceleration component detected by the gravitational acceleration detection element is parallel to the installation surface and perpendicular to the axis of the arched gate's circular motion around the hinge.

[0075] g: Gravitational acceleration, a constant, with a value of 9.8 m / s². 2 .

[0076] In use, the sensor is powered by a 9-30VDC DC power supply, which is protected by a power protection module that provides overvoltage, overcurrent, and reverse connection protection. The input power is converted to voltage by an internal DC / DC converter within the sensor. The converted power supplies the gravity acceleration detection unit and other electrical units. The output signal from the gravity acceleration detection unit is processed by a signal conditioning and hardware filtering unit, and then converted from analog to digital by an A / D converter. The digital signal is processed and calculated by the MCU microprocessor. The processed signal is transmitted via an RS485 interface and passes through a communication isolation and instantaneous overvoltage protection module to ensure the safety and stability of signal transmission. The communication protocol uses Modbus-RTU to transmit the signal to the PLC programmable controller, enabling automated control and monitoring of the arc gate system.

[0077] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A device for detecting the opening degree of an arc-shaped gate based on gravity acceleration detection, characterized in that: It includes a gravity acceleration detection unit, which is electrically connected to an MCU microprocessor via an A / D conversion module. The MCU microprocessor is electrically connected to a PLC programmable controller via an RS485 communication module. The gravity acceleration detection unit is located on the support arm of the arc gate and is used to detect the gravity acceleration component at that point that is parallel to the mounting surface and perpendicular to the axis of the arc gate's circumferential motion around the support hinge.

2. The arc gate opening detection device based on gravity acceleration detection according to claim 1, characterized in that: A signal conditioning and hardware filtering unit is also provided between the gravity acceleration detection unit and the A / D conversion module.

3. The arc gate opening detection device based on gravity acceleration detection according to claim 1, characterized in that: The RS485 communication module and the PLC programmable controller are also equipped with a communication isolation and instantaneous overvoltage protection module.

4. The arc gate opening detection device based on gravity acceleration detection according to claim 3, characterized in that: The communication protocol uses the Modbus-RTU protocol to transmit data to the PLC programmable controller.

5. The arc gate opening detection device based on gravity acceleration detection according to claim 1, characterized in that: It also includes a 9-30VDC power supply, which is converted by a DC / DC converter after passing through a power protection module, and then supplies power to the entire device.

6. The arc gate opening detection device based on gravity acceleration detection according to claim 1, characterized in that: The gravity acceleration detection unit is one or two.

7. The arc gate opening detection device based on gravity acceleration detection according to claim 6, characterized in that: Two gravity acceleration detection units are provided, located on the left and right sides of the support arm, respectively.

8. The arc gate opening detection device based on gravity acceleration detection according to claim 1, characterized in that: The gravity acceleration detection unit is encapsulated in a waterproof box.

9. The arc gate opening detection device based on gravity acceleration detection according to claim 1, characterized in that: The gravity acceleration detection unit uses the ADXL206 gravity acceleration sensor.

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