Method for detecting opening degree of radial steel gate of hydropower station

Abstract

The invention discloses a hydropower station radial steel gate opening degree detection method in the technical field of hydropower station engineering, which comprises a radial gate leaf and a hydraulic hoist, the radial gate leaf is hinged with a radial gate hinge support through a support arm, and the end part of a piston rod of the hydraulic hoist is hinged with the radial gate leaf. The method for detecting the opening degree of the arc-shaped gate leaf comprises the following steps that 1, a distance measuring device is installed at the end of the piston rod of the hydraulic hoist; 2, a hydraulic hoist piston rod stretches and retracts to drive an arc-shaped gate leaf to be opened and closed, and a distance measuring device measures the linear distance of movement of the end of the hydraulic hoist piston rod; and step 3, calculating the opening distance of the radial gate according to the linear distance. The method is high in precision, the problem of power loss and memory loss of an existing radial gate opening degree detection method is effectively solved, complex coding operation does not need to be carried out on the piston rod of the hydraulic hoist, and better applicability is achieved.

Description

Technical Field

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

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

[0003] The design of the radial steel gate usually sets a hydraulic hoist on the top or both sides of the gate, and the opening and closing operation of the radial gate around the hinge is realized by the extension and contraction of the piston rod of the hydraulic hoist. The traditional method of detecting the opening of the radial gate is to measure the extension and contraction of the piston rod of the hydraulic hoist, and then infer the opening of the radial gate. There are two main detection methods: 1. Built-in pull-rope detection method: A wire rope is set inside the piston rod of the hydraulic gate hoist. During the extension and retraction of the piston rod, the length of the wire rope will change accordingly, thereby realizing the detection of the arc door opening. However, this method has some disadvantages, such as the difficulty in replacing 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.

[0004] 2. Piston rod end sensor detection method: An output signal sensor is set at the end of the piston rod. This type of sensor is divided into two types: incremental and absolute. The arc door opening 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 power failure and can only start measuring the length again; although the absolute output signal sensor can solve the problem of power failure and memory loss, its solution is to encode the cylinder piston rod based on the position of the arc door opening, which is complicated to operate and expensive. Summary of the invention

[0005] The purpose of the present invention is to provide a method for detecting the opening of a curved steel gate in a hydropower station. The method effectively solves the problems of difficulty in replacing the steel wire rope and decreased measurement accuracy after long-term use in the existing method for detecting the opening of a curved steel gate with a built-in pull-rope; the method solves the problem of power-off amnesia in the detection method using a piston rod end sensor, and does not require complex coding operations on the piston rod of a hydraulic gate hoist, thereby having better applicability.

[0006] The technical solution adopted by the present invention is a method for detecting the opening of a curved steel gate of a hydropower station, comprising the following steps: 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 based on the straight-line distance.

[0007] The present invention is also characterized in that: The curved steel gate includes a curved gate leaf and a hydraulic hoist. The curved gate leaf is hinged to the curved gate support hinge seat via a support arm, the piston rod end of the hydraulic hoist is hinged to the curved gate leaf, and the end of the hydraulic hoist away from the piston rod is hinged to the hydraulic hoist support hinge seat.

[0008] The calculation method for step 2 is: , in, R is the radius of the gate's curved leaf, r It is the distance from the hinge point of the hydraulic hoist piston rod to the center of the arc door support hinge seat. L is the straight-line distance measured in step 1, θ It is the angle between the line connecting the bottom edge of the curved door leaf and the curved door hinge seat and the horizontal plane when the curved door leaf is fully closed. l It is the opening distance of the curved door leaf.

[0009] A distance measuring device is installed at the end of the piston rod of the hydraulic hoist.

[0010] The distance measuring device comprises a positioning element and a PLC communicatively connected therewith.

[0011] The positioning element is a GPS module.

[0012] The beneficial effects of the present invention are: The present invention calculates the opening of the radial gate by installing a distance measuring device at the end of the piston rod of the hydraulic gate hoist and measuring the straight-line distance between the ends of the piston rod of the hydraulic gate hoist when the gate is in operation and when the gate is fully closed based on a positioning element. This method solves the problems of easy aging of the rope-type measuring device, power-loss and amnesia of the incremental sensor, and complex marking of the oil cylinder by the absolute sensor, and can greatly improve the accuracy of the radial gate opening measurement and reduce the measurement cost of the radial gate opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a layout diagram of a curved steel gate and a hydraulic hoist according to Embodiment 1 of the present invention; Figure 2 This is a running track diagram of the arc steel gate and the hydraulic hoist according to Embodiment 2 of the present invention; Figure 3 This is the geometric diagram of the opening of the arc steel gate in Example 3 of the present invention; Figure 4 It is a geometric diagram of the opening of the arc steel gate in embodiment 4 of the present invention.

[0014] In the figure: 1. curved door leaf, 2. hydraulic hoist, 3. hydraulic hoist support hinge seat, 4. curved door support hinge seat, 5. connection point between the piston rod of the hydraulic hoist and the curved door leaf (lower hinge point of the piston rod), 6. straight-line distance of movement of the lower hinge point of the piston rod of the hydraulic hoist. DETAILED DESCRIPTION

[0015] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0016] Example 1 A curved steel gate device used in water conservancy and hydropower projects, such as Figure 1 As shown, it includes an arc door leaf 1 and a hydraulic hoist 2. The arc door leaf 1 is connected to the arc door support hinge seat 4 through a support arm. One end of the hydraulic hoist 2 is hinged to the hydraulic hoist support hinge seat 3. The piston rod end of the hydraulic hoist 2 is hinged to the arc door leaf 1. The hinge point is marked as the piston rod lower hinge point 5. The piston rod end of the hydraulic hoist 2 is installed with a distance measuring device. The distance measuring device includes a positioning element and a PLC (programmable logic controller) communicating with the positioning element, which is used to measure the linear movement distance of the piston rod lower hinge point 5. The opening distance of the arc door leaf 1 is then calculated based on the linear distance.

[0017] Example 2 A curved steel gate device used in water conservancy and hydropower projects, such as Figure 1 As shown, it includes an arc door leaf 1 and a hydraulic hoist 2. The arc door leaf 1 is connected to the arc door support hinge seat 4 through a support arm. One end of the hydraulic hoist 2 is hinged to the hydraulic hoist support hinge seat 3. The piston rod end of the hydraulic hoist 2 is hinged to the arc door leaf 1. The hinge point is marked as the piston rod lower hinge point 5. The piston rod end of the hydraulic hoist 2 is installed with a distance measuring device. The distance measuring device includes a positioning element and a PLC (programmable logic controller) communicating with the positioning element, which is used to measure the linear movement distance of the piston rod lower hinge point 5. The opening distance of the arc door leaf 1 is then calculated based on the linear distance.

[0018] In this embodiment, the positioning element adopts a GPS module.

[0019] The hydraulic gate hoist 2 is used to drive the arc door leaf 1 of the arc steel gate to open and close. Figure 2 As shown, the piston rod of the hydraulic gate hoist 2 contracts, driving the arc door leaf 1 to rotate upward around the arc door support hinge seat 4 and open, and at the same time, the lower hinge point 5 of the piston rod rotates upward accordingly.

[0020] When the arc door leaf 1 is in a fully closed state, the bottom edge of the arc door 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 door 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 mark the distance as the straight-line distance 6 of the lower hinge point of the hydraulic hoist piston rod. The GPS module feeds back the straight-line distance 6 of the lower hinge point of the hydraulic hoist piston rod to the PLC, and the PLC calculates the opening of the arc door leaf 1 according to the straight-line distance 6 of the lower hinge point of the hydraulic hoist piston rod.

[0021] Example 3 A curved steel gate device used in water conservancy and hydropower projects, such as Figure 1 As shown, it includes an arc door leaf 1 and a hydraulic hoist 2. The arc door leaf 1 is connected to the arc door support hinge seat 4 through a support arm. One end of the hydraulic hoist 2 is hinged to the hydraulic hoist support hinge seat 3. The piston rod end of the hydraulic hoist 2 is hinged to the arc door leaf 1. The hinge point is marked as the piston rod lower hinge point 5. The piston rod end of the hydraulic hoist 2 is installed with a distance measuring device. The distance measuring device includes a positioning element and a PLC (programmable logic controller) communicating with the positioning element, which is used to measure the linear movement distance of the piston rod lower hinge point 5. The opening distance of the arc door leaf 1 is then calculated based on the linear distance.

[0022] The hydraulic gate hoist 2 is used to drive the arc door leaf 1 of the arc steel gate to open and close. Figure 2 As shown, the piston rod of the hydraulic gate hoist 2 contracts, driving the arc door leaf 1 to rotate upward around the arc door support hinge seat 4 and open, and at the same time, the lower hinge point 5 of the piston rod rotates upward accordingly.

[0023] When the arc door leaf 1 is in a fully closed state, the bottom edge of the arc door 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 door 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 mark the distance as the straight-line distance 6 of the lower hinge point of the hydraulic hoist piston rod. In this embodiment, the positioning element adopts a GPS module, and the GPS module feeds back the straight-line distance 6 of the lower hinge point of the hydraulic hoist piston rod to the PLC. The PLC calculates the opening of the arc door leaf 1 according to the straight-line distance 6 of the lower hinge point of the hydraulic hoist piston rod.

[0024] The formula for calculating the opening of the curved door leaf 1 in the PLC is obtained in the following way: like Figure 3As shown, the opening geometry diagram of the arc steel gate device is marked, and the center point of the arc gate leaf 1 rotating around the arc gate support hinge seat 4 is marked as O; the hinge point between the hydraulic hoist 2 and the hydraulic hoist support hinge seat 3 is marked as A; the lower hinge point of the piston rod when the arc gate leaf is in the closed state is marked as B, and the contact point between the bottom edge of the arc gate leaf and the bottom sill of the gate is marked as D; when the arc gate leaf is at a certain opening position, the lower hinge point of the piston rod is marked as C, and the bottom edge of the arc gate leaf is marked as E, and the projection of E on the bottom sill of the gate is marked as F, and the projection of the arc gate leaf support hinge center point O on the bottom sill of the gate is marked as G; among them, O, A, B, D and G are all known points (coordinates and elevations are known).

[0025] The arc-shaped door leaf 1 is a rigid body, and during the opening and closing process, the arc-shaped door leaf 1 rotates around the point O, and the contact point between the bottom edge of the arc-shaped door leaf and the bottom sill of the gate and the lower hinge point of the piston rod all rotate around the point O synchronously to form two concentric circles.

[0026] Therefore, ∠DOE=∠BOC, OB and OC are the distances from the piston rod end B or C of the hydraulic hoist 2 to the center O of the arc door support hinge, which can be recorded as r ; The radius OD or OE of the curved door leaf 1 is recorded as R ; The angle between the line OD connecting the bottom edge D of the arc-shaped gate leaf and the center O of the arc-shaped gate hinge and the bottom sill of the gate when the gate is fully closed is recorded as θ ,Measurement R , r and θ , these three values ​​are constants.

[0027] During the opening and closing process of the arc door, the distance measuring device is used to measure the straight-line distance BC of the lower hinge point of the piston rod, which is recorded as L .

[0028] From the cosine theorem we can get:

[0029]

[0030]

[0031]

[0032] Because, △OBC∽△ODE; so, ,∠EDF=π-∠ODE-∠ODG=π-∠ODE- θ ; In the right triangle △DFE, EF is the opening distance of the arc door, which is marked as l , .

[0033] Example 4 like Figure 4 As shown in the figure, the radius of the curved gate leaf of a hydropower station was measured R 21000.00mm, the distance from the end of the hydraulic hoist piston rod to the center of the arc door hinge r 15640.00mm, the angle between the bottom edge of the curved door leaf and the center line of the curved door hinge and the horizontal plane when the gate is fully closed θ is 26.0428°, when the straight line distance of the lower hinge point of the piston rod moves L It is 3125.79mm, and the actual measured opening of the arc door is 3936.15mm.

[0034] Will R, r, θ as well as L Substitute the calculation formula in Example 3 into , calculate the opening distance of the arc door l =3936.15mm, the calculated result is consistent with the actual measurement result, so the method of the present invention has accurate results and is simpler to operate.

[0035] Example 5 Use CATIA to create a 3D model of the steel gate and mark the key dimensions, including the radius of the curved gate leaf. R 21000.00mm, the distance from the end of the hydraulic hoist piston rod to the center of the arc door hinge r 15640.00mm, the angle between the bottom edge of the curved door leaf and the center line of the curved door hinge and the horizontal plane when the gate is fully closed θ It is 26.0428°.

[0036] Write a script in MATLAB to simulate the movement of the steel gate from fully closed to a certain open position, and record the linear distance of the hinge point under the piston rod L It is 1617.00mm, and the actual measured opening of the arc door is 1997.38mm.

[0037] Will R, r, θ as well as L Substitute the calculation formula in Example 3 into , calculate the opening distance of the arc door l =1997.38mm, the calculated result is consistent with the actual measurement result.

[0038] Example 6 Use CATIA to create a 3D model of the steel gate and mark the key dimensions, including the radius of the curved gate leaf. R 18000.00mm, the distance from the end of the piston rod of the hydraulic hoist to the center of the arc door hinge r16000.00mm, the angle between the bottom edge of the curved door leaf and the center line of the curved door hinge and the horizontal plane when the gate is fully closed θ It is 34.0925°.

[0039] Write a script in MATLAB to simulate the movement of the steel gate from fully closed to a certain open position, and record the linear distance of the hinge point under the piston rod L It is 1916.04mm, and the actual measured opening of the arc door is 1854.22mm.

[0040] Will R, r, θ as well as L Substitute the calculation formula in Example 3 into , calculate the opening distance of the arc door l =1854.22mm, the calculated result is consistent with the actual measurement result.

[0041] The present invention calculates the opening of the radial gate by installing a distance measuring device at the end of the piston rod of the hydraulic gate hoist and measuring the straight-line distance between the ends of the piston rod of the hydraulic gate hoist when the gate is in operation and when the gate is fully closed based on a positioning element. This method solves the problems of easy aging of the rope-type measuring device, power-loss and amnesia of the incremental sensor, and complex marking of the oil cylinder by the absolute sensor, and can greatly improve the accuracy of the radial gate opening measurement and reduce the measurement cost of the radial 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 based on the straight-line distance.

2. The method for detecting the opening of the arc steel gate of a hydropower station according to claim 1 is characterized in that: 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).

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 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).

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

5. The method for detecting the opening of the arc steel gate of a hydropower station according to claim 4 is characterized in that: The distance measuring device comprises a positioning element and a PLC communicatively connected thereto.

6. The method for detecting the opening of the arc steel gate of a hydropower station according to claim 5 is characterized in that: The positioning element is a GPS module.

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