Intercepting device for water conservancy construction

Abstract

The invention discloses a cut-off device for water conservancy construction, and relates to the technical field of water conservancy cut-off. The device comprises a gate frame, a gate is slidably connected into the gate frame, and a wedge-shaped fixing plate is fixedly mounted below the gate; the gate is provided with two sets of lever mechanisms, and each set of lever mechanism comprises a connecting plate fixed to the gate, a connecting block fixedly connected with the connecting plate, a connecting rod with one end rotationally connected to the connecting block and a balancing weight fixed to the other end of the connecting rod. The center positions of the connecting rods of the two lever mechanisms are rotationally connected through a connecting shaft. The gate is provided with two sets of lever mechanisms, part of gravitational potential energy generated when the gate descends is converted into balancing weight ascending potential energy through the lever principle, reverse torque is formed to balance downward pressure, driving lifting force is reduced, and the balancing weight assists in ascending when the gate is opened, so that energy is saved. The gate frame sliding groove is precisely matched with the gate sliding block, stable lifting is guaranteed, friction is reduced, efficiency is improved, the position is stable, frequent opening and closing scenes are adapted, efficiency is improved, and the service life is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of water conservancy interception, and in particular relates to an interception device for water conservancy construction. Background Art

[0002] Water conservancy projects can be categorized by purpose or service target: flood control projects to prevent flooding; farmland water conservancy projects, also known as irrigation and drainage projects, to prevent drought, waterlogging, and waterlogging and serve agricultural production; hydroelectric power projects that convert water energy into electricity; waterway and port projects that improve and create navigation conditions; and urban water supply and drainage projects that serve industrial and domestic water needs and treat and remove sewage and rainwater. Interceptors in water conservancy construction are engineering equipment or structural systems used to temporarily or permanently block or divert water flow in rivers or waterways to facilitate water conservancy project construction (such as dam construction, channel maintenance, and cofferdam construction). Their core purpose is to control water flow, lower the water level in the construction area, and create dry land conditions for construction.

[0003] In practical applications, existing intercepting devices for water conservancy construction generally use a single baffle directly inserted into the canal to intercept water. However, this traditional design has significant structural flaws: when encountering a large water flow impact, the baffle lacks an effective support and buffer structure and is easily deformed under the strong water pressure. This can cause the entire gate and its fixed frame to be overturned by the water flow or become severely tilted, making it impossible for the intercepting device to maintain a stable working state, seriously affecting the normal progress and safety management of water conservancy construction. In addition, in actual operating environments, the water baffle must also face complex water flow conditions when performing its interception task. Summary of the Invention

[0004] In response to the problems in the related art, the present invention proposes a intercepting device for water conservancy construction to overcome the above-mentioned technical problems existing in the existing related art.

[0005] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] The present invention is a diversion device for water conservancy construction, comprising a gate frame, a gate being slidably connected to the interior of the gate frame, and a wedge-shaped fixing plate being fixedly installed below the gate; the gate is provided with two sets of lever mechanisms, each set of lever mechanisms comprising a connecting plate fixed to the gate, a connecting block fixedly connected to the connecting plate, a connecting rod rotatably connected to the connecting block at one end, and a counterweight block fixed to the other end of the connecting rod; the center positions of the connecting rods of the two sets of lever mechanisms are rotatably connected via a connecting shaft, and the connecting shaft is fixedly installed on two symmetrically arranged base frames.

[0007] Furthermore, a first slide groove is opened on the inner side of the gate frame, and sliders that slide with the first slide groove are fixedly installed on both sides of the gate; the top of the gate is fixedly connected to the output end of the driving cylinder, and the driving cylinder is fixedly installed on the top of the gate frame.

[0008] Furthermore, one end of a telescopic rod is fixedly connected to the gate, the other end of the telescopic rod is fixedly connected to a filter screen plate, and a diverter plate is fixedly installed on the filter screen plate.

[0009] Furthermore, a fixing mechanism is provided on the top of the gate frame, including a drive motor, a rotating shaft and an insertion rod; the drive motor is fixed to the top of the gate frame, and its output end is fixedly connected to the rotating shaft, and the rotating shaft passes through and is rotatably connected to the inside of the insertion rod.

[0010] Furthermore, a double-headed cam is fixedly mounted on the rotating shaft, and the raised end of the double-headed cam abuts against one end of the moving block; the other end of the moving block is fixedly connected to a protruding insertion rod, and the moving block is slidably arranged in a second sliding groove inside the insertion rod.

[0011] Furthermore, protruding blocks are fixed on both sides of the moving block, and the protruding blocks are connected to the inner wall of the second sliding groove through a reset spring, and the reset spring is used to drive the moving block to reset.

[0012] Furthermore, two fixing blocks are symmetrically provided on the outer surface of the gate frame, and a support rod is fixedly connected to the outer side of each fixing block, and one side of the support rod is reinforced with the gate frame by the fixing rod.

[0013] Furthermore, a plate is fixed to the bottom of the support rod, and a plurality of fixing cones are provided on the bottom surface of the plate.

[0014] Furthermore, the fixing rod is in a T-shaped structure, and its horizontal section is welded and fixed to the gate frame and the support rod.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention arranges two sets of lever mechanisms on the gate and utilizes the lever principle to convert part of the gravitational potential energy of the gate when it descends into the rising potential energy of the counterweight block, thereby forming a reverse torque to balance the downward pressure of the gate, significantly reducing the lifting force required by the drive device. When the gate is opened, the counterweight block can assist the gate in rising, thereby achieving energy-saving operation. At the same time, the first slide groove on the inner side of the gate frame and the sliders on both sides of the gate slide precisely together to ensure that the gate is lifted and lowered smoothly, reduce friction loss, improve transmission efficiency, and ensure the positioning accuracy and operational stability of the gate. It is suitable for water conservancy construction scenarios that require frequent opening and closing, which not only improves operational efficiency but also extends service life.

[0017] 2. The present invention fixes a telescopic rod on the gate, and the end of the telescopic rod is connected to the filter screen. The filter screen can automatically adjust its length according to the change of water level to maintain the best working angle, effectively intercepting larger particles and floating objects in the water. Its special mesh structure reduces water flow resistance while ensuring filtration efficiency; the diverter plate installed on the filter screen adopts fluid mechanics design, which can evenly disperse the water flow, avoid the impact of excessive local flow rate on the filter screen, and reduce the direct impact of the water flow on the gate; when debris accumulates, the angle of the filter screen can be adjusted by controlling the extension and retraction of the telescopic rod, and the self-cleaning function can be achieved by flushing with water. The entire filtration system rises and falls synchronously with the gate, automatically retracts when the gate is opened, and automatically unfolds when the gate is closed, realizing intelligent filtration protection, effectively reducing the workload of subsequent cleaning and maintenance, and is particularly suitable for water environments with more impurities.

[0018] 3. The present invention is provided with a fixing mechanism on the top of the gate frame, and the driving motor drives the rotating shaft to rotate, so that the double-headed cam pushes the moving block to slide inside the insertion rod, and then drives the protruding insertion rod to extend and insert into the reserved hole of the foundation or fixed base. The reset spring ensures that the moving block remains in a stable extended state to achieve mechanical self-locking. When the fixation is released, the driving motor can rotate in the opposite direction. The fixing mechanism has a compact structure and is easy to operate. It can quickly complete the fixing and release of the gate under various working conditions, thereby improving the efficiency and safety of water conservancy construction. At the same time, fixed blocks are arranged on both sides of the outer surface of the gate frame, and a stable triangular support structure is formed between the support rod and the gate frame. The fixing cone of the bottom plate of the support rod is firmly embedded in the foundation, and the T-shaped fixing rod ensures effective load transmission. The double support design makes the gate system stable under the impact of water flow, and converts the lateral force borne by the gate into pressure on the ground. It is particularly suitable for construction environments with turbulent water flow or poor foundation conditions, and takes into account the convenience of installation and disassembly.

[0019] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on the following drawings without paying any creative work.

[0021] Figure 1 It is a three-dimensional structural diagram of the present invention;

[0022] Figure 2 It is an enlarged view of point A of the present invention;

[0023] Figure 3 A top view of the present invention;

[0024] Figure 4 A schematic diagram of a gate according to the present invention;

[0025] Figure 5 Schematic diagram of the rod of the present invention Figure 1 ;

[0026] Figure 6 A cross-sectional view of the plunger of the present invention;

[0027] Figure 7 A schematic diagram of a moving block of the present invention;

[0028] Figure 8 Schematic diagram of the rod of the present invention Figure 2 .

[0029] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0030] 1. Gate frame; 2. Gate; 3. Wedge-shaped fixing plate; 4. Connecting plate; 5. Connecting block; 6. Connecting rod; 7. Counterweight; 8. Connecting shaft; 9. Base frame; 10. First chute; 11. Slider;

[0031] 12. Telescopic rod; 13. Filter plate; 14. Diverter plate; 15. Drive motor; 16. Rotating shaft;

[0032] 17. Insertion rod; 18. Double-headed cam; 19. Moving block; 20. Protruding insertion rod; 21. Second chute;

[0033] 22. Protruding block; 23. Return spring; 24. Fixed block; 25. Support rod; 26. Fixed rod; 27. Plate; 28. Fixed cone; 29. ​​Driving cylinder. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0035] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "top", "middle", "inside" and the like indicating orientation or positional relationship are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the invention.

[0036] See also Figures 1-8As shown, the present invention is a diversion device for water conservancy construction, comprising a gate frame 1, a gate 2 being slidably connected to the interior of the gate frame 1, and a wedge-shaped fixing plate 3 being fixedly installed below the gate 2; the gate 2 is provided with two sets of lever mechanisms, each set of lever mechanisms comprising a connecting plate 4 fixed to the gate 2, a connecting block 5 fixedly connected to the connecting plate 4, a connecting rod 6 rotatably connected to the connecting block 5 at one end, and a counterweight 7 fixed to the other end of the connecting rod 6; the center positions of the connecting rods 6 of the two sets of lever mechanisms are rotatably connected by a connecting shaft 8, and the connecting shaft 8 is fixedly installed on two symmetrically arranged base frames 9.

[0037] The operating principle of a water conservancy interception device for hydraulic engineering proposed in this invention is to intercept and clear water flow through the sliding cooperation of a gate frame 1 and a gate 2. A wedge-shaped fixing plate 3 positioned below the gate 2 engages the riverbed foundation when the gate 2 is lowered, forming a self-tightening seal. When the gate 2 needs to be lowered to intercept flow, it slides down along the inner slide rails of the gate frame 1. At this point, two sets of lever mechanisms fixed on either side of the gate 2 begin to work in unison. Each lever mechanism consists of a connecting plate 4, a connecting block 5, a connecting rod 6, and a counterweight 7. As the gate 2 descends, the connecting plate drives the connecting block 5 downward, causing the connecting rod 6 to rotate about its central connecting shaft 8, thereby lifting the counterweight 7 at the other end. This process converts some of the gravitational potential energy of the gate 2 into the upward potential energy of the counterweight 7, generating a counter-torque that balances the downward pressure on the gate 2, significantly reducing the lifting force required by the drive mechanism. The two lever mechanisms maintain synchronized motion via a shared connecting shaft 8, ensuring balanced force on both sides of the gate 2 and preventing deflection or jamming. When gate 2 is fully lowered into position, the wedge-shaped fixing plate 3, under the influence of its own gravity and the pressure of the water flow, adheres tightly to the riverbed, effectively preventing water leakage. To open gate 2, the drive device only needs to apply a small lifting force. The counterweight block 7 then naturally falls under the action of gravity, assisting the gate 2 in ascending through the lever action, achieving energy-saving operation. The entire device, through the dynamic counterweight balance of the lever mechanism and the automatic sealing of the wedge-shaped fixing plate 3, not only ensures the effective interception, but also improves operational efficiency and service life. It is particularly suitable for water conservancy construction scenarios that require frequent opening and closing.

[0038] In one embodiment, for the above-mentioned gate frame 1, a first slide groove 10 is opened on the inner side of the gate frame 1, and sliders 11 that slide with the first slide groove 10 are fixedly installed on both sides of the gate 2; the top of the gate 2 is fixedly connected to the output end of the driving cylinder 29, and the driving cylinder 29 is fixedly installed on the top of the gate frame 1.

[0039] The working principle of a diversion device for water conservancy construction proposed by the present invention is that the first chute 10 symmetrically opened on the inner side of the gate frame 1 forms a precise sliding fit with the sliders 11 installed on both sides of the gate 2, ensuring that the gate 2 maintains smooth operation during the lifting process. The driving cylinder 29 is fixedly installed on the top of the gate frame 1, and its output end is rigidly connected to the top of the gate 2, providing a stable driving force for the gate 2. When the gate needs to be closed, the piston rod of the driving cylinder 29 extends, pushing the gate 2 to descend vertically along the first chute 10, and the slider 11 slides in the first chute 10, effectively reducing the movement resistance. During the descent of the gate 2, the cooperation between the sliders 11 on both sides and the first chute 10 ensures the accuracy of the movement trajectory of the gate 2, avoiding deflection or jamming. When the gate 2 is fully closed, the driving cylinder 29 maintains a certain locking force to ensure that the gate 2 maintains a stable seal under the water flow pressure. When the gate needs to be opened, the piston rod of the drive cylinder 29 retracts, driving the gate 2 to rise steadily along the first chute 10. The sliding engagement of the slider 11 ensures smooth and unimpeded opening of the gate 2. Throughout the entire opening and closing process, the coordinated design of the first chute 10 and slider 11 effectively reduces friction loss, improves transmission efficiency, and ensures the positioning accuracy and operational stability of the gate 2. This structural design makes the opening and closing of the gate 2 more reliable, making it suitable for water conservancy projects requiring frequent opening and closing.

[0040] In one embodiment, for the gate 2 , one end of a telescopic rod 12 is fixedly connected to the gate 2 , the other end of the telescopic rod 12 is fixedly connected to a filter screen 13 , and a diverter plate 14 is fixedly mounted on the filter screen 13 .

[0041] The operating principle of the intercepting device for water conservancy construction proposed in this invention is that when the gate 2 is in operation, the telescopic rod 12 attached to it automatically adjusts its length according to water level fluctuations, driving the filter screen 13 at the end to maintain an optimal operating angle. As water flows through, the filter screen 13 effectively intercepts larger particles of debris and floating objects in the water. Its specially designed mesh structure minimizes flow resistance while ensuring filtration efficiency. The diverter plate 14 mounted on the filter screen 13 utilizes a fluid dynamics design to evenly disperse the water flow, preventing localized excessive flow from impacting the filter screen 13. When debris accumulates to a certain level in the water, the operator can adjust the angle of the filter screen 13 by controlling the extension and retraction of the telescopic rod 12, achieving a self-cleaning function through water flushing. The entire filtration system rises and falls synchronously with the gate 2, automatically retracting when the gate is opened and deploying when it is closed, providing intelligent filtration protection. This design not only ensures the normal operation of water conservancy facilities but also effectively reduces the workload of subsequent cleaning and maintenance, making it particularly suitable for water environments with high impurities. The diversion function of the diverter plate 14 can also significantly reduce the direct impact force of the water flow on the gate 2, thereby extending the service life of the gate.

[0042] In one embodiment, for the above-mentioned gate frame 1, a fixing mechanism is provided at the top of the gate frame 1, including a drive motor 15, a rotating shaft 16 and an insertion rod 17; the drive motor 15 is fixed to the top of the gate frame 1, and its output end is fixedly connected to the rotating shaft 16, and the rotating shaft 16 passes through and is rotatably connected to the inside of the insertion rod 17.

[0043] In one embodiment, for the above-mentioned rotating shaft 16, a double-headed cam 18 is fixedly installed on the rotating shaft 16, and the raised end of the double-headed cam 18 abuts against one end of the moving block 19; the other end of the moving block 19 is fixedly connected to a protruding insertion rod 20, and the moving block 19 is slidably set in the second sliding groove 21 inside the insertion rod 17.

[0044] In one embodiment, for the above-mentioned moving block 19, protruding blocks 22 are fixed on both sides of the moving block 19. The protruding blocks 22 are connected to the inner wall of the second sliding groove 21 through a return spring 23. The return spring 23 is used to drive the moving block 19 to return to its original position.

[0045] The working principle of the intercepting device for water conservancy construction proposed by the present invention is that when the device is needed, the driving motor 15 installed on the top of the gate frame 1 is started, driving the rotating shaft 16 to rotate, so that the double-headed cam 18 fixed on the rotating shaft 16 rotates synchronously. During the rotation process, the raised part of the double-headed cam 18 pushes the moving block 19 to slide outward in the second slide groove 21 inside the insertion rod 17. The sliding of the moving block 19 drives the protruding insertion rod 20 connected to its end to extend outward and insert into the reserved hole of the foundation or fixed base. The protruding blocks 22 on both sides of the moving block 19 are connected to the inner wall of the second slide groove 21 through the reset spring 23. After the double-headed cam 18 continues to rotate past the highest point, the elastic force of the reset spring 23 ensures that the moving block 19 remains in a stable extended state without retracting, thereby realizing mechanical self-locking. When release is required, the drive motor 15 rotates in the opposite direction, causing the raised portion of the double-headed cam 18 to contact the movable block 19 again, overcoming the elastic force of the return spring 23 and pulling the movable block 19 back. This in turn causes the protruding rod 20 to retract into the interior of the rod 17, releasing the fixed state. The precise contour design of the double-headed cam 18 and the coordination of the return spring 23 ensure reliable reciprocating motion and self-locking functions throughout the entire mechanism, ensuring that the gate remains secure during construction. This fixing mechanism is compact and easy to operate, enabling rapid gate fixation and release under various operating conditions, significantly improving the efficiency and safety of hydraulic construction.

[0046] In one embodiment, for the above-mentioned gate frame 1, two fixed blocks 24 are symmetrically provided on the outer surface of the gate frame 1, and a support rod 25 is fixedly connected to the outer side of each fixed block 24, and one side of the support rod 25 is reinforced with the gate frame 1 by a fixing rod 26.

[0047] In one embodiment, for the support rod 25 , a plate 27 is fixed to the bottom of the support rod 25 , and a plurality of fixing cones 28 are provided on the bottom surface of the plate 27 .

[0048] In one embodiment, the fixing rod 26 is in a T-shaped structure, and a horizontal section thereof is welded and fixed to the gate frame 1 and the support rod 25 .

[0049] The operating principle of the intercepting device for water conservancy construction proposed in this invention is that fixed blocks 24, symmetrically arranged on either side of the outer surface of the gate frame 1, serve as the primary load-bearing points. Support rods 25 rigidly connected to the outer sides of each fixing block 24 and connected to the gate frame 1 are connected by T-shaped fixing rods 26 to form a stable triangular support structure. When the gate is subjected to water flow, the impact force is first transmitted through the gate frame 1 to the fixed blocks 24 on either side. The support rods 25 then transfer part of the load to the ground. Plates 27 welded to the bottom of the support rods 25 are firmly embedded in the foundation through multiple fixing cones 28 distributed on their undersides, providing an anchoring effect that resists pullout and overturning. The horizontal sections of the T-shaped fixing rods 26 are connected to the gate frame 1 and support rods 25 through full-penetration welding to ensure effective load transfer. This dual support design ensures the stability of the entire gate system under water flow impact. The support rods 25 and fixing rods 26 work together to convert the lateral force exerted on the gate into pressure on the ground. The fixing cones 28 at the bottom of the plates 27 are staggered to provide sufficient anti-slip resistance in soft soil. When the gate needs to be moved, simply pull the retaining cone 28 out of the foundation. This support system is particularly suitable for construction environments with turbulent water flow or poor foundation conditions. Through multiple force paths, it ensures the stability of the gate under various working conditions while also taking into account the convenience of installation and removal.

[0050] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0051] The preferred embodiments of the invention disclosed above are intended only to help illustrate the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. The embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A closure device for water conservancy construction, comprising a gate frame (1), characterized in that: The gate frame (1) is internally slidably connected to a gate (2), and a wedge-shaped fixing plate (3) is fixedly installed below the gate (2); the gate (2) is provided with two groups of lever mechanisms, each group of lever mechanisms includes a connecting plate (4) fixed on the gate (2), a connecting block (5) fixedly connected to the connecting plate (4), a connecting rod (6) with one end rotatably connected to the connecting block (5), and a counterweight (7) fixed to the other end of the connecting rod (6); the center positions of the connecting rods (6) of the two groups of lever mechanisms are rotatably connected through a connecting shaft (8), and the connecting shaft (8) is fixedly installed on two symmetrically arranged base frames (9).

2. A water conservancy construction intercepting device according to claim 1, characterized in that: A first sliding groove (10) is provided on the inner side of the gate frame (1), and sliders (11) that slide in cooperation with the first sliding groove (10) are fixedly installed on both sides of the gate (2); the top of the gate (2) is fixedly connected to the output end of the driving cylinder (29), and the driving cylinder (29) is fixedly installed on the top of the gate frame (1).

3. A water conservancy construction intercepting device according to claim 2, characterized in that: One end of a telescopic rod (12) is fixedly connected to the gate (2), the other end of the telescopic rod (12) is fixedly connected to a filter screen plate (13), and a diverter plate (14) is fixedly mounted on the filter screen plate (13).

4. A water conservancy construction intercepting device according to claim 3, characterized in that: The top of the gate frame (1) is provided with a fixing mechanism, comprising a driving motor (15), a rotating shaft (16) and an inserting rod (17); the driving motor (15) is fixed to the top of the gate frame (1), and its output end is fixedly connected to the rotating shaft (16); the rotating shaft (16) passes through and is rotatably connected to the inside of the inserting rod (17).

5. A water conservancy construction intercepting device according to claim 4, characterized in that: A double-headed cam (18) is fixedly mounted on the rotating shaft (16), and the raised end of the double-headed cam (18) contacts one end of a moving block (19); the other end of the moving block (19) is fixedly connected to a protruding insertion rod (20), and the moving block (19) is slidably arranged in a second sliding groove (21) inside the insertion rod (17).

6. A water conservancy construction intercepting device according to claim 5, characterized in that: Protruding blocks (22) are fixed on both sides of the moving block (19). The protruding blocks (22) are connected to the inner wall of the second sliding groove (21) through a reset spring (23). The reset spring (23) is used to drive the moving block (19) to reset.

7. A water conservancy construction intercepting device according to claim 1, characterized in that: Two fixing blocks (24) are symmetrically provided on the outer surface of the gate frame (1), and a support rod (25) is fixedly connected to the outer side of each fixing block (24), and one side of the support rod (25) is reinforced and connected to the gate frame (1) via a fixing rod (26).

8. A water conservancy construction intercepting device according to claim 7, characterized in that: A plate (27) is fixed to the bottom of the support rod (25), and a plurality of fixing cones (28) are provided on the bottom surface of the plate (27).

9. A water conservancy construction intercepting device according to claim 8, characterized in that: The fixing rod (26) is in a T-shaped structure, and its horizontal section is welded and fixed to the gate frame (1) and the supporting rod (25).

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