A light shielding and separating structure of a yellow catfish breeding pond

Abstract

The utility model discloses a kind of light-shielding light-isolating structures of yellow catfish breeding pond, in view of the rigidified adjustment of traditional light-shielding device, insufficient covering, single function problem, adopt lifting assembly, connecting seat, multistage telescopic component and folding shielding component linkage design, realize vertical lifting, horizontal two-way extension, angle and amplitude folding three-dimensional space adjustment;Folding light-shielding plate is the flexible material of transmittance adjustable, feedback control is combined with displacement sensor, accurately adapt yellow catfish different growth stage light requirement.Structure is compact, accurate adjustment, improve breeding environment stability and efficiency, applicable to various yellow catfish breeding ponds.

Description

Technical Field

[0001] This utility model relates to the field of aquaculture facilities technology, and in particular to a light-shielding and light-blocking structure for a yellow catfish breeding pond. Background Technology

[0002] Yellow catfish (also known as yellow bone fish) is an important freshwater aquaculture species in my country, and it is highly sensitive to the light conditions of its culture environment. Studies have shown that yellow catfish prefer low-light or shady environments. Excessive light intensity can easily lead to increased stress response, decreased feeding rate, and even cause agitation or disease in the fish population; while insufficient light may affect its circadian rhythm and metabolic activity, reducing growth rate and survival rate. Therefore, controlling the light environment of the culture pond is one of the key technical aspects of large-scale yellow catfish farming.

[0003] Currently, traditional shading and light-blocking measures for yellow catfish farming ponds have the following shortcomings: Poor adjustment flexibility: Existing shading structures are mostly fixed shade nets, steel frames with tarpaulins, or manually adjustable sheds, which can only achieve rough adjustment in a single dimension (such as vertical lifting). They cannot dynamically adjust the shading range and form according to the farming cycle (such as fry stage, growth stage), seasonal changes (such as strong light in summer, weak light in winter), or differences in day and night light, making it difficult to match the light requirements of yellow catfish at different growth stages. Limited coverage: Fixed structures are limited by installation location and mechanical structure, resulting in a short horizontal extension distance, which cannot cover the full shading needs of large farming ponds (such as ponds with an area exceeding 5 acres). While some retractable structures can expand the coverage, they mostly adopt a single-stage telescopic design with limited extension length, and are prone to jamming or deviation due to insufficient guiding accuracy. Lack of precise control: Traditional devices lack displacement feedback and automated control modules. The shading angle and expansion range mainly rely on manual experience, making it difficult to achieve precise control of light intensity and uniformity, easily causing uneven light distribution in the pond and affecting the consistency of farming. Limited functionality: Existing shading materials are mostly ordinary tarpaulins or plastic films, which only have basic shading functions and cannot adjust the light transmittance according to needs (such as needing appropriate supplemental lighting on cloudy or rainy days and needing enhanced shading on sunny days), making it difficult to adapt to complex and changeable weather conditions.

[0004] In summary, there is an urgent need to develop a new type of light-blocking and light-insulating structure with multi-degree-of-freedom linkage adjustment, precise control, and adaptive lighting adaptation functions to meet the needs of refined yellow catfish farming. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a light-shielding and light-blocking structure for yellow catfish breeding ponds.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: This utility model discloses a light-shielding and light-blocking structure for a yellow catfish aquaculture pond, comprising: a lifting assembly for driving the overall structure to rise and fall vertically, with a U-shaped double fork arm fixedly connected to one side of its sliding seat; a connecting seat fixedly installed on the upper surface of the horizontal section of the double fork arm; a multi-stage telescopic assembly horizontally fixed on the connecting seat, with its output end pointing towards the center of the aquaculture pond; and a folding shielding assembly fixedly installed above the end of the multi-stage telescopic assembly. The lifting assembly, double fork arm, connecting seat, multi-stage telescopic assembly, and folding shielding assembly are mechanically linked in sequence to realize the adjustment of the position and shape of the light-shielding structure in the three-dimensional space above the aquaculture pond.

[0007] As a preferred embodiment of this utility model, the lifting assembly includes: a vertical lifting base, vertically fixed to the bank of the aquaculture pond or a supporting frame, with T-shaped guide protrusions on both side walls; a clamping wheel assembly, including a clamping wheel bracket and a polyurethane clamping wheel body rotatably mounted thereon via bearings; the clamping wheel bracket is fixedly connected to the inner side wall of the lifting box, and the clamping wheel body makes rolling contact with the T-shaped guide protrusion side walls of the vertical lifting base; and a climbing wheel assembly, including a climbing wheel bracket and a rubber climbing wheel rotatably mounted thereon via bearings. The lifting wheel body; the climbing wheel bracket is fixedly connected to the inner wall of the lifting box, and the climbing wheel body rolls in contact with the bottom surface of the T-shaped guide protrusion of the vertical lifting base; the lifting box integrates a servo motor drive unit inside, and its bottom is slidably connected to the guide rail at the bottom of the vertical lifting base through a slider, and its side wall is fixedly connected to the side wall of the double fork arm through bolts; the clamping wheel group cooperates with the climbing wheel group to clamp the T-shaped guide protrusion, and the vertical lifting of the lifting box is realized by the servo motor drive, thereby driving the double fork arm and subsequent components to lift synchronously.

[0008] As a preferred embodiment of this utility model, the multi-stage telescopic assembly includes: a horizontal guide rail, consisting of two parallel linear ball bearing guide rails fixedly mounted on the upper surface of the connecting seat; a drive motor fixedly mounted on the connecting seat and located at one end of the horizontal guide rail, with its output shaft fixedly connected to a drive helical gear; a first fork arm slidably mounted on the horizontal guide rail, with a rack meshing with the drive helical gear fixedly connected to its bottom; a second fork arm slidably mounted in a C-shaped sliding groove opened in the side wall of the first fork arm, with its end fixedly connected to the folding base of the folding shielding assembly by bolts; and a connecting gear set, including several driven gears disposed on the side of the first fork arm, the driven gears meshing with the rack; the drive motor drives the first fork arm to extend and retract along the horizontal guide rail through the drive helical gear, and simultaneously drives the driven gears to rotate through the connecting gear set, thereby driving the second fork arm to extend and retract relative to the first fork arm a second time, realizing two-stage extension in the horizontal direction.

[0009] As a preferred technical solution of this utility model, the inner wall of the C-shaped sliding groove of the first fork arm is provided with a trapezoidal guide protrusion along the length direction, and the outer wall of the second fork arm is provided with a trapezoidal guide groove that slides with the trapezoidal guide protrusion; the guide protrusion and the guide groove are in clearance fit.

[0010] As a preferred embodiment of this utility model, the folding shielding assembly includes: a folding base, fixedly installed at the end of a multi-stage telescopic assembly; a main beam, hinged to the folding base via a swing cylinder, wherein the cylinder body of the swing cylinder is fixedly connected to the upper surface of the folding base, and the piston rod is hinged to the middle of the lower surface of the main beam; auxiliary telescopic arms, symmetrically and vertically arranged on both sides of the main beam, with their fixed ends fixedly connected to the side of the main beam and their telescopic ends extending away from the main beam; and a folding light-shielding plate, which is a flexible composite material plate with adjustable light transmittance, its lower end being connected to the auxiliary... The upper surface of the telescopic arm's telescopic end is hinged, and the upper end extends horizontally away from the main beam; the folding bracket has an X-shaped linkage structure and is symmetrically arranged on both sides of the main beam, with its central hinge point hinged to the middle of the corresponding folding light-shielding plate; the telescopic cylinder is symmetrically arranged on both sides of the main beam, with its cylinder body hinged to the upper surface of the main beam and its piston rod hinged to the lower part of the folding bracket; the swing cylinder drives the main beam to rotate around the hinge point to adjust the light-shielding angle, and the telescopic cylinder pushes the folding bracket to unfold or fold by telescopic movement, thereby driving the folding light-shielding plate to adjust the unfolding range.

[0011] As a preferred technical solution of this utility model, both the swing cylinder and the telescopic cylinder are integrated with displacement sensors. The displacement sensors are used to provide real-time feedback on the rotation angle of the main beam and the unfolding range of the folding light-shielding plate, so as to cooperate with the control system to achieve precise adjustment of the light-shielding position.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. Through the sequential linkage of the lifting assembly, multi-stage telescopic assembly, and folding shielding assembly, the light-shielding structure achieves precise three-dimensional positioning in vertical lifting (Z-axis), horizontal bidirectional extension (X / Y-axis), and angle / amplitude folding (angle adjustment). For example, the lifting assembly clamps the T-shaped guide protrusion with clamping wheel sets and climbing wheel sets, and with the help of a servo motor, it can achieve millimeter-level vertical lifting accuracy; the multi-stage telescopic assembly adopts a two-stage fork arm linkage, which increases the horizontal extension length by more than 30% compared with the traditional single-stage telescopic structure, and the trapezoidal design of the guide protrusion and groove ensures that there is no offset or jamming during the extension process; the folding shielding assembly can adjust the angle of the main beam and the unfolding range of the folding light-shielding plate through the coordinated action of the swing cylinder and the telescopic cylinder, so as to meet the light control needs of different areas and different times of day; 2. The folding light-blocking panel is made of a flexible composite material with adjustable light transmittance. It can dynamically adjust the light transmittance of the material according to the breeding stage (such as the need for weak light during the fry stage and diffused light during the growth stage) or the intensity of external light (such as automatically reducing light transmittance on sunny days and increasing light transmittance on cloudy and rainy days). At the same time, the X-shaped linkage structure of the folding bracket, together with the telescopic cylinder, can flexibly control the unfolding area of ​​the light-blocking panel, ensuring the light-blocking effect while avoiding excessive shading that would lead to too dark a light in the pond, and maintaining suitable light uniformity. 3. Both the swing cylinder and the telescopic cylinder integrate displacement sensors, which can collect data on the main beam rotation angle (accuracy ±0.5°) and the unfolding range of the folding light-shielding plate (accuracy ±2mm) in real time and feed it back to the control system. Through a preset algorithm, the system can automatically adjust the actions of each component according to the real-time light monitoring data of the aquaculture pond (such as light sensor linkage), realize closed-loop precise control of the light-shielding position, reduce manual intervention, reduce labor intensity, and avoid light control deviations caused by human error. 4. The vertical lifting base of the lifting assembly is fixed to the bank or support frame of the aquaculture pond, eliminating the need for additional space within the pond; the horizontal guide rail and connecting seat of the multi-stage telescopic assembly are integrated, reducing installation complexity; the X-shaped connecting rod and auxiliary telescopic arm of the folding shield assembly fold together to create a compact size, facilitating storage and maintenance. This structure is adaptable to yellow catfish aquaculture ponds of different sizes and shapes, making it suitable for a wide range of applications. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is the front view of this utility model; Figure 3 This is a partial enlarged view of the present invention; Figure 4 This is a side view of the present invention; In the diagram: 1. Lifting assembly; 2. Multi-stage telescopic assembly; 3. Folding shielding assembly; 4. Double fork arm; 5. Connecting seat; 11. Vertical lifting base; 12. Clamping wheel assembly; 13. Climbing wheel assembly; 14. Lifting box; 21. Horizontal guide rail; 22. Drive motor; 23. Connecting gear assembly; 24. First fork arm; 25. Second fork arm; 26. Straight rack; 31. Folding base; 32. Main beam; 33. Auxiliary telescopic arm; 34. Folding sunshade; 35. Folding bracket; 36. Telescopic cylinder; 37. Swing cylinder; 38. Displacement sensor; 111. T-shaped guide protrusion; 121. Clamping wheel bracket; 122. Clamping wheel body; 131. Climbing wheel bracket; 132. Climbing wheel body; 221. Driving helical gear; 231. Driven gear; 241. C-shaped sliding groove; 242. Guide protrusion; 251. Guide groove. Detailed Implementation

[0014] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0015] In the attached diagram, all identical reference numerals refer to the same components.

[0016] Example 1: Basic Structure Assembly and Interconnection Relationship like Figure 1-4 As shown, this utility model provides a light-shielding and light-blocking structure for a yellow catfish breeding pond, focusing on demonstrating the basic connection relationship and core function realization of each component.

[0017] Lifting Assembly 1: The vertical lifting base 11 is a vertical frame welded from metal profiles, fixedly installed on a concrete foundation or steel support frame on the bank of the aquaculture pond. T-shaped guide protrusions 111 are machined on both side walls along the height direction. Clamping Wheel Assembly 12 includes a clamping wheel bracket 121 and a polyurethane clamping wheel body 122: The clamping wheel bracket 121 is an L-shaped metal plate, fixed to the inner wall of the lifting box 14 by bolts; the polyurethane clamping wheel body 122 is rotatably mounted on the horizontal end of the clamping wheel bracket 121 via a deep groove ball bearing, with the wheel surface rolling in contact with the side wall of the T-shaped guide protrusion 111. Climbing Wheel Assembly 13 includes a climbing wheel bracket 131 and a rubber climbing wheel body 132: The climbing wheel bracket 131 is also an L-shaped metal plate, fixed to the other inner wall of the lifting box 14; the rubber climbing wheel body 132 is rotatably mounted on the horizontal end of the climbing wheel bracket 131 via a bearing, with the wheel surface rolling in contact with the bottom surface of the T-shaped guide protrusion 111. The lifting box 14 is a rectangular sealed box. Its bottom is slidably connected to the guide rail at the bottom of the vertical lifting base 11 via a linear slider. Its side wall is fixedly connected to the horizontal section side wall of the double fork arm 4 via bolts. The box has a built-in servo motor drive unit, which drives the clamping wheel set 12 and the climbing wheel set 13 through synchronous belt transmission to clamp the T-shaped guide protrusion 111, so as to realize the smooth lifting of the lifting box 14 in the vertical direction, thereby driving the double fork arm 4 and subsequent components to lift vertically synchronously.

[0018] Connecting seat 5: It is a rectangular steel plate seat, which is fixed to the center of the upper surface of the horizontal section of the double fork arm 4 by high-strength bolts. Two parallel straight ball bearing guides (i.e., the horizontal guide rail 21 of the multi-stage telescopic component 2) are machined on its upper surface along the width of the aquaculture pond.

[0019] Please see Figure 2 Multi-stage telescopic assembly 2: A horizontal guide rail 21 is fixedly installed on the upper surface of the connecting seat 5. A drive motor 22 is fixed to one end of the connecting seat 5 via a flange, and an output shaft is keyed to a drive helical gear 221. The first fork arm 24 is a rectangular frame structure, with a spur rack 26 fixedly connected to the bottom by bolts. The spur rack 26 meshes with the drive helical gear 221, allowing the first fork arm 24 to slide horizontally along the horizontal guide rail 21. A C-shaped sliding groove 241 is provided at the top of the first fork arm 24, and a trapezoidal guide protrusion 242 is machined along the length of the groove. The second fork arm 25 is a rectangular plate, with a trapezoidal guide groove 251 corresponding to the outer wall, which slides in conjunction with the trapezoidal guide protrusion 242, allowing it to extend and retract horizontally along the C-shaped sliding groove 241. The connecting gear set 23 includes several driven gears 231, all of which are mounted on the side of the first fork arm 24 via shafts and bearings. The driven gears 231 mesh with the rack 26. When the drive motor 22 drives the first fork arm 24 to extend or retract, the rack 26 drives the driven gears 231 to rotate, thereby driving the second fork arm 25 to extend or retract relative to the first fork arm 24 a second time through gear meshing, achieving two-stage extension in the horizontal direction. The end of the second fork arm 25 is fixedly connected to the folding base 31 of the folding shield assembly 3 by bolts.

[0020] Please see Figure 4 The folding shielding assembly 3 consists of a square base 31, bolted to the end of the second fork arm 25. The main beam 32 is an I-beam, hinged at its center to the piston rod of the swing cylinder 37 via a pin. The cylinder body of the swing cylinder 37 is bolted to the upper surface of the folding base 31. The auxiliary telescopic arm 33 is an electric push rod, symmetrically positioned on both sides of the main beam 32, with its fixed end welded to the side of the main beam 32 and its telescopic end extending away from the main beam. The folding light-shielding plate 34 is a flexible composite material plate with adjustable light transmittance, its lower end hinged to the upper surface of the telescopic end of the auxiliary telescopic arm 33, and its upper end extending horizontally away from the main beam. The folding bracket 35 is an X-shaped linkage structure, symmetrically positioned on both sides of the main beam 32, with its central hinge point hinged to the center of the corresponding folding light-shielding plate 34 via a pin. The telescopic cylinder 36 is a double-acting cylinder, symmetrically arranged on both sides of the main beam 32. The cylinder body is hinged to the upper surface of the main beam 32 via a pin, and the piston rod is hinged to the lower part of the folding bracket 35 via a pin. Both the swing cylinder 37 and the telescopic cylinder 36 integrate displacement sensors 38, which provide real-time feedback on the rotation angle of the main beam 32 and the unfolding range of the folding light-shielding plate 34, respectively. The signals are transmitted to the control system to achieve precise adjustment of the light-shielding position.

[0021] Example 2: Adaptation and Adjustment of Large-Span Aquaculture Ponds This embodiment focuses on scenarios with a large aquaculture pond width, emphasizing the extension capability of the multi-level telescopic component 2 and its compatibility with the folding shielding component 3.

[0022] When the width of the aquaculture pond exceeds the range of a single-stage telescopic extension, the first fork arm 24 of the multi-stage telescopic component 2 extends along the horizontal guide rail 21 under the drive of the drive motor 22. Simultaneously, the driven gear 231 of the connecting gear set 23 drives the second fork arm 25 to extend and retract relative to the first fork arm 24 for a second time. The total length of the two-stage extension can cover the width of the aquaculture pond. In the folding shielding component 3, the auxiliary telescopic arm 33 extends and retracts synchronously according to the unfolding angle of the main beam 32, keeping the lower end of the folding light-shielding plate 34 horizontal. The telescopic cylinder 36 pushes the folding bracket 35 to fully unfold, so that the folding light-shielding plate 34 is in a horizontal state, covering the entire upper part of the aquaculture pond. If local shading is required, the stroke of the telescopic cylinder 36 can be shortened so that the folding light-shielding plate 34 only unfolds to the target area. Combined with the light transmittance adjustment function of the flexible composite material (such as adjusting the thickness of the light-shielding layer through the internal winding mechanism), differentiated shading of different areas can be achieved to meet the flexible control needs of large-span aquaculture ponds.

[0023] Example 3: Intelligent and Precise Control Scenario This embodiment emphasizes intelligent feedback and precise control in the linkage of various components.

[0024] The control system receives signals from the displacement sensor 38 of the swing cylinder 37 and calculates the rotation angle of the main beam 32 in real time (e.g., adjustable within the range of 0° to 90°). This allows for adjustment of the pitch angle of the folded light-shielding plate 34 to adapt to different solar altitude angles at different times of day (e.g., increasing the tilt angle for low-angle morning sunlight and decreasing it for high-angle midday sunlight). Simultaneously, the displacement sensor 38 of the telescopic cylinder 36 provides feedback on the unfolding range of the folded light-shielding plate 34 (e.g., 0% to 100% of the stroke from fully retracted to fully unfolded). Combined with the growth stage of the fish in the aquaculture pond (e.g., 50% shading for juvenile fish and 30% for adult fish), the control system automatically adjusts the unfolding range and the light transmittance of the light-shielding plate (adjusted via a flexible material winding mechanism) to ensure that the light intensity remains stable within the suitable range for yellow catfish. In addition, the servo motor of the lifting component 1 uses an encoder to provide feedback on the lifting height (e.g., from 0.5m to 2m above the pond surface), and coordinates with seasonal changes (e.g., raising the height in summer to avoid direct sunlight, and lowering it in winter to enhance heat preservation), to achieve full-dimensional intelligent control in three-dimensional space and ensure the light stability of the yellow catfish farming environment.

[0025] In summary, this utility model, through the coordinated design of lifting, telescopic, and folding components, combined with an intelligent feedback system, achieves precise three-dimensional spatial adjustment of the shading structure in yellow catfish farming ponds, meeting the light requirements of different growth stages and environmental conditions. It has the advantages of structural stability, flexible adjustment, and strong adaptability.

[0026] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A light-shading and light-blocking structure for a yellow catfish farming pond, characterized in that, include: The lifting assembly (1) is used to drive the overall structure to rise and fall vertically. A U-shaped double fork arm (4) is fixedly connected to one side of its sliding seat. The connecting seat (5) is fixedly installed on the upper surface of the horizontal section of the double fork arm (4). The multi-stage telescopic assembly (2) is horizontally fixed on the connecting seat (5), and its output end points to the center of the aquaculture pond. The folding shielding assembly (3) is fixedly installed above the end of the multi-stage telescopic assembly (2). The lifting assembly (1), double fork arm (4), connecting seat (5), multi-stage telescopic assembly (2) and folding shielding assembly (3) are mechanically linked in sequence to realize the position and shape adjustment of the shading structure in the three-dimensional space above the aquaculture pond.

2. The light-shielding and light-blocking structure for a yellow catfish farming pond according to claim 1, characterized in that, The lifting assembly (1) includes: a vertical lifting base (11), which is vertically fixed to the bank of the aquaculture pond or a support frame, and has T-shaped guide protrusions (111) on both side walls; a clamping wheel assembly (12), which includes a clamping wheel bracket (121) and a polyurethane clamping wheel body (122) rotatably mounted thereon via bearings; the clamping wheel bracket (121) is fixedly connected to the inner side wall of the lifting box (14), and the clamping wheel body (122) rolls in contact with the side wall of the T-shaped guide protrusions (111) of the vertical lifting base (11); and a climbing wheel assembly (13), which includes a climbing wheel bracket (131) and a rubber climbing wheel body (132) rotatably mounted thereon via bearings. The climbing wheel bracket (131) is fixedly connected to the inner wall of the lifting box (14), and the climbing wheel body (132) rolls in contact with the bottom surface of the T-shaped guide protrusion (111) of the vertical lifting base (11). The lifting box (14) integrates a servo motor drive unit inside, and its bottom is slidably connected to the guide rail at the bottom of the vertical lifting base (11) through a slider. Its side wall is fixedly connected to the side wall of the double fork arm (4) through bolts. The clamping wheel group (12) and the climbing wheel group (13) cooperate to clamp the T-shaped guide protrusion (111). The vertical lifting of the lifting box (14) is achieved by the servo motor drive, thereby driving the double fork arm (4) and subsequent components to lift synchronously.

3. The light-shielding and light-blocking structure for a yellow catfish farming pond according to claim 1, characterized in that, The multi-stage telescopic assembly (2) includes: a horizontal guide rail (21), which consists of two parallel linear ball bearing guide rails, fixedly installed on the upper surface of the connecting seat (5); a drive motor (22), fixedly installed on the connecting seat (5) and located at one end of the horizontal guide rail (21), with an output shaft fixedly connected to an active helical gear (221); a first fork arm (24), slidably installed on the horizontal guide rail (21), with a spur rack (26) fixedly connected to its bottom to mesh with the active helical gear (221); and a second fork arm (25), slidably installed in a C-shaped sliding groove (241) opened on the side wall of the first fork arm (24). Its end is fixedly connected to the folding base (31) of the folding shielding assembly (3) by bolts; the connecting gear set (23) includes a number of driven gears (231) disposed on the side of the first fork arm (24), the driven gears (231) meshing with the rack (26); the drive motor (22) drives the first fork arm (24) to extend and retract along the horizontal guide rail (21) through the active helical gear (221), and at the same time drives the driven gears (231) to rotate through the connecting gear set (23), thereby driving the second fork arm (25) to extend and retract relative to the first fork arm (24) for a second time, realizing two-stage extension in the horizontal direction.

4. The light-shielding and light-blocking structure for a yellow catfish farming pond according to claim 3, characterized in that, The inner wall of the C-shaped sliding groove (241) of the first fork arm (24) is provided with a trapezoidal guide protrusion (242) along the length direction, and the outer wall of the second fork arm (25) is provided with a trapezoidal guide groove (251) that slides with the trapezoidal guide protrusion (242); the guide protrusion (242) and the guide groove (251) are in clearance fit.

5. The light-shielding and light-blocking structure for a yellow catfish farming pond according to claim 1, characterized in that, The folding shielding assembly (3) includes: a folding base (31), fixedly installed at the end of the multi-stage telescopic assembly (2); a main beam (32), hinged to the folding base (31) via a swing cylinder (37), wherein the cylinder body of the swing cylinder (37) is fixedly connected to the upper surface of the folding base (31), and the piston rod is hinged to the middle of the lower surface of the main beam (32); an auxiliary telescopic arm (33), symmetrically and vertically arranged on both sides of the main beam (32), wherein its fixed end is fixedly connected to the side of the main beam (32), and its telescopic end extends away from the main beam (32); and a folding light-shielding plate (34), which is a flexible composite material plate with adjustable light transmittance, wherein its lower end is telescopically connected to the auxiliary telescopic arm (33). The upper surface of the end is hinged, and the upper end extends horizontally away from the main beam (32); the folding bracket (35) is an X-shaped linkage structure, symmetrically arranged on both sides of the main beam (32), and its middle hinge point is hinged to the middle of the corresponding folding light shield (34); the telescopic cylinder (36) is symmetrically arranged on both sides of the main beam (32), its cylinder body is hinged to the upper surface of the main beam (32), and its piston rod is hinged to the lower part of the folding bracket (35); the swing cylinder (37) drives the main beam (32) to rotate around the hinge point to adjust the light shielding angle, and the telescopic cylinder (36) pushes the folding bracket (35) to unfold or fold by telescopic movement, thereby driving the folding light shield (34) to adjust the unfolding range.

6. The light-shielding and light-blocking structure for a yellow catfish farming pond according to claim 5, characterized in that, Both the swing cylinder (37) and the telescopic cylinder (36) are equipped with displacement sensors (38). The displacement sensors (38) are used to provide real-time feedback on the rotation angle of the main beam (32) and the unfolding range of the folded light-shielding plate (34) in order to cooperate with the control system to achieve precise adjustment of the light-shielding position.

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