Absolute opening sensor for underwater high-precision radial gate

Abstract

The invention discloses an absolute opening degree sensor for an underwater high-precision radial gate, and relates to the technical field of gate opening degree detection. The underwater high-precision radial gate absolute opening sensor comprises a fixed ruler and a magnetic head, the fixed ruler comprises a ruler body, the front face of the ruler body is fixedly connected with a cover plate through sealant, the back face of the ruler body is fixedly connected with a bottom plate through screws, an inner cavity of the ruler body is fixedly connected with a PCB through sealant, and the outer surface of the PCB is fixedly connected with a Hall sensor array. The magnetic head comprises a support, the outer side of the vertical part of the support is fixedly connected with a sliding block through a screw, and a permanent magnet is arranged in a groove in the outer surface of the sliding block, direct and high-precision absolute position measurement of the gate opening degree can be achieved, and the problem that a traditional hoist is insufficient in indirect measurement precision is solved.

Description

Technical Field

[0001] This invention relates to the field of gate opening detection technology, specifically to an underwater high-precision arc gate absolute opening sensor. Background Technology

[0002] Gates are core control facilities in hydraulic structures used to close or open spillway channels. Their core functions include intercepting water flow, regulating upstream and downstream water levels, controlling flow rate, discharging sediment, and intercepting floating debris, thereby meeting various engineering needs. Gates typically consist of a gate body, frame, drive mechanism, and sealing components. Based on their structure, they can be classified into various types such as flat gates, arc gates, and miter gates. In water conservancy projects, gates are commonly used in reservoirs, canals, and dams for flood control, irrigation, power generation, or navigation.

[0003] Gate opening degree is an important equipment parameter in gate operation and management, and plays a crucial role in gate control. For a long time, gate opening degree sensors have been installed on the hoist, which is an indirect measurement and has poor accuracy. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an underwater high-precision arc gate absolute opening sensor, thereby solving the problem mentioned in the background art of poor indirect measurement accuracy caused by existing gate opening sensors being installed on the hoist.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an underwater high-precision arc gate absolute opening sensor, comprising a fixed scale and a magnetic head. The fixed scale comprises a scale body, a cover plate fixedly connected to the front of the scale body by sealant, a base plate fixedly connected to the back of the scale body by screws, a PCB board fixedly connected to the inner cavity of the scale body by sealant, and a Hall sensor array fixedly connected to the outer surface of the PCB board. The magnetic head comprises a bracket, a slider fixedly connected to the outer side of the vertical part of the bracket by screws, and a permanent magnet disposed in the groove on the outer surface of the slider.

[0006] Preferably, the outer surface of the PCB board is provided with an electrical connection terminal, and the electrical connection terminal is provided with a wire body, the wire body passing through a wire hole on the outer surface of the ruler body.

[0007] Preferably, the outer surface of the base plate is provided with wire fixing holes, first mounting holes and lifting holes. The wire fixing holes and first mounting holes are evenly arranged on the outer surface of the base plate, and the lifting holes are symmetrically arranged at both ends of the base plate.

[0008] Preferably, the PCB board arc array is located inside the ruler body, the PCB board is configured as a long strip with both ends tilted inward, and the Hall sensor array is an interlaced double array.

[0009] Preferably, the horizontal portion of the bracket is provided with a second mounting hole.

[0010] Beneficial effects

[0011] This invention provides a high-precision underwater arc-shaped gate absolute opening sensor. It offers the following advantages:

[0012] 1. This underwater high-precision arc gate absolute opening sensor, through the cooperation of the Hall sensor array in the fixed length and the permanent magnet in the magnetic head, combined with the multi-magnetic head group layout and the algorithm for converting arc length and angle, realizes direct and high-precision absolute position measurement of the gate opening, solving the problem of insufficient accuracy of indirect measurement in traditional hoisting machines.

[0013] 2. This high-precision underwater arc gate absolute opening sensor simplifies the manufacturing process through the design of a polygonal PCB board, while also being able to flexibly adapt to arc gates with different radii of curvature. In addition, the integrated scale design and the application of sealant enhance the sensor's waterproof performance, ensuring stable operation in the underwater environment. Attached Figure Description

[0014] Figure 1 It is a schematic structural diagram of the present invention as a whole;

[0015] Figure 2 This is a schematic diagram of the structure when the present invention is installed on the base plate with a fixed length;

[0016] Figure 3 This is a schematic diagram of the fixed-length structure of the present invention;

[0017] Figure 4 This is a schematic diagram of the back structure of the fixed-length version of the present invention;

[0018] Figure 5 This is a schematic diagram of the internal structure of the ruler body of the present invention;

[0019] Figure 6 This is a schematic diagram of the PCB board structure of the present invention;

[0020] Figure 7 This is a schematic diagram of the structure of the magnetic head of the present invention;

[0021] Figure 8 This is a schematic diagram of the structure of the present invention when the measuring scale and the magnetic head are respectively installed on the side wall and the gate.

[0022] In the diagram: 1. Scale; 101. Scale body; 102. Cover plate; 103. Wire body; 104. PCB board; 105. Hall sensor array; 106. Electrical connection terminal; 2. Magnetic head; 201. Bracket; 202. Second mounting hole; 203. Slider; 204. Permanent magnet; 3. Base plate; 4. Wire fixing hole; 5. First mounting hole; 6. Lifting hole. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] like Figure 1-8 As shown, the present invention provides an underwater high-precision arc gate absolute opening sensor, including a fixed scale 1 and a magnetic head 2. The fixed scale 1 includes a scale body 101. A cover plate 102 is fixedly connected to the front of the scale body 101 by sealant. A base plate 3 is fixedly connected to the back of the scale body 101 by screws. A PCB board 104 is fixedly connected to the inner cavity of the scale body 101 by sealant. A Hall sensor array 105 is fixedly connected to the outer surface of the PCB board 104. The magnetic head 2 includes a bracket 201. A slider 203 is fixedly connected to the outer side of the vertical part of the bracket 201 by screws. A permanent magnet 204 is provided in the groove on the outer surface of the slider 203.

[0025] Specifically, the outer surface of the PCB board is provided with an electrical connection terminal 106, and the electrical connection terminal 106 is provided with a wire body 103, which passes through the wire hole on the outer surface of the ruler body 101.

[0026] Specifically, the outer surface of the base plate 3 is provided with wire fixing holes 4, first mounting holes 5 and lifting holes 6. The wire fixing holes 4 and first mounting holes 5 are evenly arranged on the outer surface of the base plate 3, and the lifting holes 6 are symmetrically arranged at both ends of the base plate 3.

[0027] Specifically, the PCB board 104 is arranged in an arc shape within the inner cavity of the ruler body 101. The PCB board 104 is set as a long strip with both ends tilted inward. The Hall sensor array 105 is an interlaced double array.

[0028] Specifically, the horizontal portion of the bracket 201 is provided with a second mounting hole 202.

[0029] The working principle of the above embodiments:

[0030] This device consists of a fixed scale 1 and magnetic heads 2. Using a fixed scale 1 and multiple magnetic heads 2, it enables large-stroke testing under short fixed-length conditions. For example, a gate can be equipped with three magnetic heads 2, divided into two groups: the first group has one magnetic head 2, and the second group has two magnetic heads 2. The magnetic heads 2 of the first group and the magnetic heads 2 of the second group are separated by a certain distance (less than the length of the fixed scale 1). When the gate opens, the fixed scale 1 senses the movement of one magnetic head 2. As the gate continues to open, the magnetic heads 2 of the second group successively interact with the fixed scale 1, at which point the fixed scale 1 senses the movement of all three magnetic heads 2. When the gate continues to open, the magnetic heads 2 of the first group leave the sensing range of the fixed scale 1, at which point the fixed scale 1 senses the movement of two magnetic heads 2. In extreme cases, the magnetic heads 2 of the first group and the first magnetic head 2 of the second group have entered the sensing range of the fixed scale 1, but the second magnetic head 2 of the second group has not yet entered the sensing range of the fixed scale 1. In this case, the fixed scale 1 can also determine which magnetic head 2 is moving on the fixed scale 1 by calculating the distance between the two magnetic heads 2.

[0031] This device calculates the gate opening by detecting the arc length, which increases the detection accuracy. The calculation method is as follows:

[0032] Obtain basic information: the radius of curvature R of the arched gate, the radius of curvature r of fixed scale 1, and the distance from the center of the hinge circle to the elevation of the bottom sill H;

[0033] When the gate is fully closed, the original angle is: α = arccos(H / R);

[0034] When the gate is opened, the fixed scale 1 obtains the arc length information, i.e., L; the gate opening angle is calculated as: β=(L / 2πr)*360°;

[0035] Calculate the angle after the gate opens: γ = α + β;

[0036] The opening degree is calculated using trigonometric functions: Open = H – R * cosγ.

[0037] This device simplifies the design and manufacturing process by using multiple polygonal PCB boards 104 to form an arc array. The PCB board 104 is long and narrow with both ends tilted inward, which facilitates the formation of arrays with different radii of curvature. This is equivalent to using the chord length instead of the arc length, which can be restored to the arc length in later calculations. Although this method loses some detection accuracy, it can cover various radii of curvature and adapt to different specifications of arc gates. The scale body 101 is machined as a whole, which increases waterproof performance while meeting strength requirements.

[0038] The on-site installation method for the fixed scale 1 and magnetic head 2 is as follows: Mark the drilling positions on the side wall according to the position of the first mounting hole 5 on the base plate 3 and drill holes. Connect the scale body 101 to the base plate 3 with screws (generally three scale bodies 101). After passing the wire body 103 through the protective conduit, fix it to the base plate 3 through the wire fixing hole 4. Lift the installed components through the lifting hole 6 of the base plate 3, install expansion bolts according to the drilling positions and tighten them. During tightening, maintain the verticality of the scale body 101. Electrically connect to the control room, install the sliding contact system at the specific position of the gate, and the installation of the fixed scale 1 and magnetic head 2 is completed. The fixed scale 1 is manufactured by passing the wire body 103, which is electrically connected to the PCB board 104, through the wire passage hole (generally one scale body 101 contains...). Five PCB boards 104 are used. The ruler body 101 has two steps. The first step is located at the opening of the ruler body 101, and the second step is located in the inner cavity of the ruler body 101. An appropriate amount of sealant is poured into the cavity of the ruler body 101. Then, the electrically connected PCB boards 104 are placed in an array on the second step of the ruler body 101 and the PCB boards 104 are bonded to the sealant. After the sealant has solidified, sealant is poured in again. Then, the cover plate 102 is placed on the first step of the ruler body 101 and the cover plate 102 is clamped with a clamp. After the sealant has solidified, the sealant squeezed out from the gap between the cover plate 102 and the ruler body 101 is scraped off. The magnetic head 2 is made by installing the slider 203 on the bracket 201 and inserting the permanent magnet 204 into the slider 203 according to the required polarity.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An underwater high-precision arc gate absolute opening sensor, comprising a fixed scale (1) and a magnetic head (2), characterized in that: The fixed ruler (1) includes a ruler body (101). A cover plate (102) is fixedly connected to the front of the ruler body (101) by sealant. A base plate (3) is fixedly connected to the back of the ruler body (101) by screws. A PCB board (104) is fixedly connected to the inner cavity of the ruler body (101) by sealant. A Hall sensor array (105) is fixedly connected to the outer surface of the PCB board (104). The magnetic head (2) includes a bracket (201). A slider (203) is fixedly connected to the outer side of the vertical part of the bracket (201) by screws. A permanent magnet (204) is provided in the groove on the outer surface of the slider (203).

2. The underwater high-precision arc gate absolute opening sensor according to claim 1, characterized in that: The outer surface of the PCB board (104) is provided with an electrical connection terminal (106), and the electrical connection terminal (106) is provided with a wire body (103), which passes through the wire hole on the outer surface of the ruler body (101).

3. The underwater high-precision arc gate absolute opening sensor according to claim 1, characterized in that: The outer surface of the base plate (3) is provided with wire fixing holes (4), first mounting holes (5) and lifting holes (6). The wire fixing holes (4) and first mounting holes (5) are evenly arranged on the outer surface of the base plate (3), and the lifting holes (6) are symmetrically arranged at both ends of the base plate (3).

4. The underwater high-precision arc gate absolute opening sensor according to claim 1, characterized in that: The PCB board (104) is arranged in an arc shape in the inner cavity of the ruler body (101). The PCB board (104) is set as a long strip and tilted inward at both ends. The Hall sensor array (105) is an interlaced double array.

5. The underwater high-precision arc gate absolute opening sensor according to claim 1, characterized in that: The horizontal portion of the bracket (201) is provided with a second mounting hole (202).

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