Detection Method for Opening Degree of Hydropower Station Radial Steel Gate

Abstract

The present invention discloses a method for detecting the opening degree of a hydroelectric power station's arc-shaped steel gate in the field of hydroelectric power station engineering technology. The method for detecting the opening degree of the arc-shaped steel gate of a hydroelectric power station includes an arc-shaped gate leaf and a hydraulic hoist. The arc-shaped gate leaf is hinged to the arc gate hinge seat through a support arm. The end of the piston rod of the hydraulic hoist is hinged to the arc-shaped gate leaf, and the end away from the piston rod is hinged to the hydraulic hoist hinge seat. The method for detecting the opening degree of the arc-shaped gate leaf includes the following steps: Step 1, install a distance measuring device at the end of the piston rod of the hydraulic hoist; Step 2, the piston rod of the hydraulic hoist expands and contracts to drive the arc-shaped gate leaf to open and close, and the distance measuring device measures the linear distance of the movement of the end of the piston rod of the hydraulic hoist; Step 3, calculate the opening degree distance of the arc gate according to this linear distance. This method has high precision, effectively solves the problem of power failure and memory loss of the existing method for detecting the opening degree of the arc-shaped gate, and does not require complex coding operations on the piston rod of the hydraulic hoist, and has better applicability.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydropower station engineering, and particularly relates to a method for detecting the opening degree of an arc-shaped steel gate of a hydropower station. Background Art

[0002] At present, high-head and large-orifice arc-shaped steel gates have been widely used in the water discharge structures of water conservancy and hydropower projects. To ensure the smooth completion of the flood discharge task, accurate detection and control of the gate opening degree are crucial.

[0003] In the design of an arc-shaped steel gate, a hydraulic hoist is usually arranged at the top or both sides of the gate, and the opening and closing operation of the arc gate around the hinge is realized by the telescopic movement of the piston rod of the hydraulic hoist. The traditional method for detecting the opening degree of the arc gate is to measure the telescopic amount of the piston rod of the hydraulic hoist, and then inversely deduce the opening degree of the arc-shaped gate. There are mainly the following two types of such detection methods:

[0004] 1. Built-in wire rope detection method: A wire rope is arranged inside the piston rod of the hydraulic hoist. During the telescopic movement of the piston rod, the length of the wire rope will change accordingly, so as to realize the detection of the opening degree of the arc gate. However, this method has some drawbacks. For example, it is difficult to replace the wire rope, and after long-term use, the wire rope is prone to filament phenomenon, and the coil spring is also prone to fatigue, resulting in inaccurate measurement accuracy.

[0005] 2. Piston rod end sensor detection method: An output signal sensor is arranged at the end of the piston rod. Such sensors are divided into two types: incremental type and absolute type. The opening degree of the arc gate is detected by scanning the position information on the piston rod. Among them, the incremental output signal sensor cannot remember the position of the piston rod after losing power and can only start measuring the length again; while the absolute output signal sensor can solve the problem of losing power and memory, but its solution is to encode the piston rod of the oil cylinder based on the position of the arc gate opening degree, with complex operation and high cost. Summary of the Invention

[0006] The purpose of the present invention is to provide a method for detecting the opening degree of an arc-shaped steel gate of a hydropower station. This method effectively solves the problems of difficult replacement of the wire rope in the existing built-in wire rope opening degree detection method for arc-shaped gates and the decline of measurement accuracy after long-term use; the problem of losing power and memory in the piston rod end sensor detection method, and there is no need to perform complex coding operations on the piston rod of the hydraulic hoist, having better applicability.

[0007] The technical solution adopted by the present invention is a method for detecting the opening degree of an arc-shaped steel gate of a hydropower station, including the following steps:

[0008] Step 1, measure the straight-line distance between the end of the piston rod of the hydraulic hoist and the position of this end when the gate is in the fully closed state during the opening and closing process of the gate;

[0009] Step 2: Calculate the opening distance of the gate according to the straight-line distance.

[0010] The features of the present invention also lie in:

[0011] The arc-shaped steel gate includes an arc-shaped gate leaf and a hydraulic hoist. The arc-shaped gate leaf is hinged to the arc gate hinge seat through a support arm. The end of the piston rod of the hydraulic hoist is hinged to the arc-shaped gate leaf, and one end of the hydraulic hoist far from the piston rod is hinged to the hydraulic hoist hinge seat.

[0012] The calculation method of Step 2 is as follows:

[0013] ,

[0014] wherein, R is the radius of the arc-shaped gate leaf of the gate, r is the distance from the hinge point of the piston rod of the hydraulic hoist to the center of the arc gate hinge seat, L is the straight-line distance measured in Step 1, θ is the angle between the connecting line of the bottom edge of the arc-shaped gate leaf and the arc gate hinge seat and the horizontal plane when the arc-shaped gate leaf is in the fully closed state, l is the opening distance of the arc-shaped gate leaf.

[0015] A distance measuring device is installed at the end of the piston rod of the hydraulic hoist.

[0016] The distance measuring device includes a positioning element and a PLC communicatively connected thereto.

[0017] The positioning element is a GPS module.

[0018] The beneficial effects of the present invention are:

[0019] By installing the distance measuring device at the end of the piston rod of the hydraulic hoist, the present invention measures the straight-line distance between the end of the piston rod of the hydraulic hoist in the operating state and the fully closed state of the gate based on the positioning element, thereby calculating the opening of the arc-shaped gate. This method solves the problems of easy aging of the rope-type measuring device, power loss and memory loss of the incremental sensor, and complex marking of the oil cylinder by the absolute sensor, and can greatly improve the accuracy of the arc gate opening measurement and reduce the measurement cost of the arc gate opening. Description of the Drawings

[0020] Figure 1 is the layout diagram of the arc-shaped steel gate and the hydraulic hoist in Embodiment 1 of the present invention;

[0021] Figure 2 is the operating trajectory diagram of the arc-shaped steel gate and the hydraulic hoist in Embodiment 2 of the present invention;

[0022] Figure 3 is the geometric diagram of the arc-shaped steel gate opening in Embodiment 3 of the present invention;

[0023] Figure 4 It is the geometric diagram of the opening degree of the arc-shaped steel gate in Embodiment 4 of the present invention.

[0024] In the figure: 1. Arc-shaped gate leaf, 2. Hydraulic hoist, 3. Hydraulic hoist hinge support seat, 4. Arc gate hinge support seat, 5. Connection point between the piston rod of the hydraulic hoist and the arc-shaped gate leaf (lower hinge point of the piston rod), 6. Linear distance of the movement of the lower hinge point of the piston rod of the hydraulic hoist. Specific implementation manners

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0026] Embodiment 1

[0027] An arc-shaped steel gate device used in water conservancy and hydropower projects, as Figure 1 shown, includes an arc-shaped gate leaf 1 and a hydraulic hoist 2. The arc-shaped gate leaf 1 is connected to the arc gate hinge support seat 4 through a support arm. One end of the hydraulic hoist 2 is hinged to the hydraulic hoist hinge support seat 3, and the piston rod end of the hydraulic hoist 2 is hinged to the arc-shaped gate leaf 1. This hinge point is marked as the lower hinge point 5 of the piston rod. A distance measuring device is installed at the piston rod end of the hydraulic hoist 2. The distance measuring device includes a positioning element and a PLC (programmable logic controller) communicating with the positioning element, and is used to measure the linear movement distance of the lower hinge point 5 of the piston rod. Then, the opening degree distance of the arc-shaped gate leaf 1 is calculated based on this linear distance.

[0028] Embodiment 2

[0029] An arc-shaped steel gate device used in water conservancy and hydropower projects, as Figure 1 shown, includes an arc-shaped gate leaf 1 and a hydraulic hoist 2. The arc-shaped gate leaf 1 is connected to the arc gate hinge support seat 4 through a support arm. One end of the hydraulic hoist 2 is hinged to the hydraulic hoist hinge support seat 3, and the piston rod end of the hydraulic hoist 2 is hinged to the arc-shaped gate leaf 1. This hinge point is marked as the lower hinge point 5 of the piston rod. A distance measuring device is installed at the piston rod end of the hydraulic hoist 2. The distance measuring device includes a positioning element and a PLC (programmable logic controller) communicating with the positioning element, and is used to measure the linear movement distance of the lower hinge point 5 of the piston rod. Then, the opening degree distance of the arc-shaped gate leaf 1 is calculated based on this linear distance.

[0030] In this embodiment, the positioning element adopts a GPS module.

[0031] The hydraulic hoist 2 is used to drive the opening and closing of the arc-shaped gate leaf 1 of the arc-shaped steel gate. As Figure 2 shown, when the piston rod of the hydraulic hoist 2 contracts, it drives the arc-shaped gate leaf 1 to rotate upward around the arc gate hinge support seat 4 to open, and at the same time, the lower hinge point 5 of the piston rod rotates upward accordingly.

[0032] When the arc-shaped gate leaf 1 is in the fully closed state, the bottom edge of the arc-shaped gate leaf contacts the bottom sill. At this time, the position of the lower hinge point 5 of the piston rod is set as the end point. When the arc-shaped gate leaf 1 is opened, the GPS module is used to obtain the straight-line distance from the lower hinge point 5 of the piston rod to the end point in real time, and this distance is marked as the straight-line distance 6 of the movement of the lower hinge point of the piston rod of the hydraulic hoist. The GPS module feeds back the straight-line distance 6 of the movement of the lower hinge point of the piston rod of the hydraulic hoist to the PLC, and the PLC calculates the opening degree of the arc-shaped gate leaf 1 according to the straight-line distance 6 of the movement of the lower hinge point of the piston rod of the hydraulic hoist.

[0033] Embodiment 3

[0034] An arc-shaped steel gate device used in water conservancy and hydropower projects, as Figure 1 shown, includes an arc-shaped gate leaf 1 and a hydraulic hoist 2. The arc-shaped gate leaf 1 is connected to the arc gate hinge seat 4 through a support arm. One end of the hydraulic hoist 2 is hinged to the hydraulic hoist hinge seat 3, and the piston rod end of the hydraulic hoist 2 is hinged to the arc-shaped gate leaf 1. This hinge point is marked as the lower hinge point 5 of the piston rod. A distance measuring device is installed at the piston rod end of the hydraulic hoist 2. The distance measuring device includes a positioning element and a PLC (programmable logic controller) communicating with the positioning element, and is used to measure the straight-line movement distance of the lower hinge point 5 of the piston rod. Then, the opening degree distance of the arc-shaped gate leaf 1 is calculated according to this straight-line distance.

[0035] The hydraulic hoist 2 is used to drive the opening and closing of the arc-shaped gate leaf 1 of the arc-shaped steel gate. As Figure 2 shown, when the piston rod of the hydraulic hoist 2 contracts, it drives the arc-shaped gate leaf 1 to rotate upward around the arc gate hinge seat 4 to open, and at the same time, the lower hinge point 5 of the piston rod rotates upward accordingly.

[0036] When the arc-shaped gate leaf 1 is in the fully closed state, the bottom edge of the arc-shaped gate leaf contacts the bottom sill. At this time, the position of the lower hinge point 5 of the piston rod is set as the end point. When the arc-shaped gate leaf 1 is opened, the positioning element is used to obtain the straight-line distance from the lower hinge point 5 of the piston rod to the end point in real time, and this distance is marked as the straight-line distance 6 of the movement of the lower hinge point of the piston rod of the hydraulic hoist. In this embodiment, the positioning element adopts a GPS module. The GPS module feeds back the straight-line distance 6 of the movement of the lower hinge point of the piston rod of the hydraulic hoist to the PLC, and the PLC calculates the opening degree of the arc-shaped gate leaf 1 according to the straight-line distance 6 of the movement of the lower hinge point of the piston rod of the hydraulic hoist.

[0037] The formula for calculating the opening degree of the arc-shaped gate leaf 1 in the PLC is obtained in the following way:

[0038] As Figure 3As shown in the figure, mark the geometric diagram of the opening degree of the arc-shaped steel gate device. Mark the center point of the rotation of the arc-shaped gate leaf 1 around the arc gate hinge seat 4 as O; mark the hinge point of the hydraulic hoist 2 and the hydraulic hoist hinge seat 3 as A; when the arc-shaped gate leaf is in the fully closed state, mark the lower hinge point of the piston rod as B, and at the same time mark the contact point between the bottom edge of the arc-shaped gate leaf and the gate sill as D; when the arc-shaped gate leaf is at a certain opening position, mark the lower hinge point of the piston rod as C, and at the same time mark the bottom edge of the arc-shaped gate leaf as E, and mark the projection of E on the gate sill as F, and mark the projection of the center point O of the arc-shaped gate hinge on the gate sill as G; among them, O, A, B, D, and G are all known points (both coordinates and elevations are known).

[0039] The arc-shaped gate leaf 1 is a rigid body. During the opening and closing process, the arc-shaped gate leaf 1 rotates around point O, and the contact point between the bottom edge of the arc-shaped gate leaf and the gate sill and the lower hinge point of the piston rod both rotate around point O synchronously, forming two concentric circles.

[0040] Therefore, ∠DOE = ∠BOC. OB and OC are the distances from the end B or C of the piston rod of the hydraulic hoist 2 to the center O of the arc gate hinge, and denote them as r ; Denote the radius OD or OE of the arc-shaped gate leaf 1 as R ; Denote the angle between the connecting line OD of the bottom edge D of the arc-shaped gate leaf and the center O of the arc gate when the gate is fully closed and the gate sill as θ , measure R , r and θ , and these three values are constants.

[0041] During the opening and closing process of the arc gate, use a distance measuring device to measure the straight-line distance BC of the movement of the lower hinge point of the piston rod, and denote it as L .

[0042] According to the cosine theorem, we can get:

[0043]

[0044]

[0045]

[0046]

[0047] Because, △OBC∽△ODE;

[0048] So, , ∠EDF = π - ∠ODE - ∠ODG = π - ∠ODE - θ ;

[0049] In the right triangle △DFE, EF is the opening distance of the arc gate, and mark it as l ,

[0050] 。

[0051] Example 4

[0052] As Figure 4 shown, the radius of the arc gate leaf of a certain hydropower station is measured R to be 21000.00 mm, and the distance from the end of the piston rod of the hydraulic hoist to the center of the hinge of the arc gate is r 15640.00 mm. When the gate is in the fully closed state, the angle between the connecting line of the bottom edge of the arc gate leaf and the center of the hinge of the arc gate and the horizontal plane is θ 26.0428°. When the linear distance of the movement of the lower hinge point of the piston rod is L 3125.79 mm, the actual measured opening of the arc gate is 3936.15 mm.

[0053] Substitute R, r, θ and L into the calculation formula in Example 3 , and calculate the opening distance of the arc gate l = 3936.15 mm. The calculation result is consistent with the actual measurement result. Therefore, the method of the present invention has accurate results and is simpler to operate.

[0054] Example 5

[0055] Use CATIA to create a 3D model of the steel gate and mark the key dimensions. The radius of the arc gate leaf is R 21000.00 mm, and the distance from the end of the piston rod of the hydraulic hoist to the center of the hinge of the arc gate is r 15640.00 mm. When the gate is in the fully closed state, the angle between the connecting line of the bottom edge of the arc gate leaf and the center of the hinge of the arc gate and the horizontal plane is θ 26.0428°.

[0056] Write a script in MATLAB to simulate the movement process of the steel gate from the fully closed state to a certain opening position, and record the linear distance of the movement of the lower hinge point of the piston rod L as 1617.00 mm, and the actual measured opening of the arc gate is 1997.38 mm.

[0057] Substitute R, r, θ and L into the calculation formula in Example 3 , and calculate the opening distance of the arc gate l = 1997.38 mm. The calculation result is consistent with the actual measurement result.

[0058] Example 6

[0059] Create a 3D model of the steel gate using CATIA and mark the key dimensions, where the radius of the arc-shaped gate leaf R is 18000.00 mm, and the distance from the end of the piston rod of the hydraulic hoist to the center of the hinge of the arc gate r is 16000.00 mm. The angle between the line connecting the bottom edge of the arc-shaped gate leaf and the center of the hinge of the arc gate and the horizontal plane when the gate is fully closed θ is 34.0925°.

[0060] Write a script in MATLAB to simulate the movement process of the steel gate from the fully closed position to a certain opening position, and record the straight-line distance of the movement of the lower hinge point of the piston rod L is 1916.04 mm, and the actual measured opening of the arc gate is 1854.22 mm.

[0061] Bring R, r, θ and L into the calculation formula in Embodiment 3 , and calculate the opening distance of the arc gate l = 1854.22 mm, and this calculation result is consistent with the actual measurement result.

[0062] In the present invention, by installing a distance measuring device at the end of the piston rod of the hydraulic hoist, based on the positioning element, the straight-line distance of the end of the piston rod of the hydraulic hoist in the operating state and the fully closed state of the gate is measured, so as to calculate the opening of the arc-shaped gate. This method solves the problems such as the easy aging of the rope-type measuring device, the power-off memory loss of the incremental sensor, and the complex marking of the absolute sensor for the oil cylinder, and can improve the measurement accuracy of the arc gate opening to a greater extent and reduce the measurement cost of the arc gate opening.

Claims

1. A method for detecting the opening of a curved steel gate of a hydropower station, characterized in that: The following steps are involved: Step 1, measuring the straight-line distance between the end of the piston rod of the hydraulic gate hoist and the position of the end when the gate is fully closed during the gate opening and closing process; Step 2, calculating the gate opening distance according to the straight-line distance; The arc-shaped steel gate comprises an arc-shaped gate leaf (1) and a hydraulic gate hoist (2); the arc-shaped gate leaf (1) is hinged to an arc-shaped gate support hinge seat (4) via a support arm; the piston rod end of the hydraulic gate hoist (2) is hinged to the arc-shaped gate leaf (1); and the end of the hydraulic gate hoist (2) away from the piston rod is hinged to the hydraulic gate hoist support hinge seat (3); The calculation method of step 2 is: in, R is the radius of the gate's curved leaf (1), r is the distance from the hinge point of the piston rod of the hydraulic hoist (2) to the center of the arc door support hinge seat (4), and L is the straight-line distance measured in step 1. θ is the angle between the line connecting the bottom edge of the curved door leaf and the curved door support hinge seat (4) and the horizontal plane when the curved door leaf (1) is in the fully closed state, l is the opening distance of the curved door leaf (1).

2. The method for detecting the opening of the arc steel gate of a hydropower station according to claim 1 is characterized in that: A distance measuring device is installed at the end of the piston rod of the hydraulic hoist (2).

3. The method for detecting the opening of the arc steel gate of a hydropower station according to claim 2 is characterized in that: The distance measuring device comprises a positioning element and a PLC communicatively connected thereto.

4. The method for detecting the opening of the arc steel gate of a hydropower station according to claim 3 is characterized in that: The positioning element is a GPS module.

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