Anti-freezing flap gate

Abstract

The application belongs to the technical field of water conservancy projects, and discloses an anti-freezing flap gate, which comprises a gate body, a gas conveying pipe and a fixing strip, the lower end of the gate body is movably hinged with an arc-shaped side plate, the side surface of the lower end of the gate body is fixedly connected with a fixing cylinder, the inside of the fixing cylinder is fixedly connected with a first spring, and the inside of the fixing cylinder is movably connected with an adjusting rod. The gas injection device is started to work, air is supplied to the inside of the communicating pipe through the connecting pipes at both ends, the air in the communicating pipe is introduced into the aeration pipe through the gas conveying pipe, and finally comes out through the aeration holes. The continuously coming-out air continuously splashes water in the water, so that the water in the region is not easy to freeze, the buoyant plate can rise and fall along with the water level, thereby pulling the communicating pipe to slide along the limiting groove to stably rise and fall, so that the aeration pipe and the liquid surface always keep a certain distance, and it is ensured that the air can stably splash water through the aeration holes.

Description

Technical Field

[0001] This invention belongs to the field of water conservancy engineering technology, specifically a frost-resistant flap gate. Background Technology

[0002] In cold regions, existing flap gates are prone to freezing in winter. The ice on the reservoir surface connects to the gate, which rotates on its pivot point. During this process, the ice constantly resists the gate's opening, causing malfunctions. Existing solutions include installing heating wires inside the gate to prevent freezing at the water level. However, this doesn't guarantee against freezing in all areas. When the gate opens, its lower end slowly rotates upwards, and some of it still comes into contact with ice from other areas, resulting in poor antifreeze protection. Furthermore, sediment tends to accumulate at the lower end of the gate within the reservoir, forming a layer of silt that adheres tightly to the gate and further hinders opening. Summary of the Invention

[0003] The purpose of this invention is to provide an antifreeze flap gate to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a frost-resistant flap gate, comprising a gate body, an air supply pipe, and a fixing bar. An arc-shaped side plate is movably hinged to the lower end of the gate body. A fixing cylinder is fixedly connected to the side of the lower end of the gate body. A first spring is fixedly connected inside the fixing cylinder. An adjusting rod is movably connected inside the fixing cylinder. An air injection device is fixedly installed on the top of the gate body. Connecting pipes communicating with the air injection device are fixedly installed inside both ends of the gate body. A connecting pipe is movably connected inside the connecting pipe. The bottom of the air injection device is fixedly connected to... A vent pipe is connected to connecting pipes at both ends. A buoyancy plate is fixedly installed at the bottom of the outer end of the connecting pipe. A sliding cylinder is movably sleeved inside the connecting pipe. A second spring is fixedly connected to the outer side of the sliding cylinder and fixedly connected to the inner wall of the connecting pipe. A spiral slide is opened on the inner wall of the connecting pipe. A straight slide is opened on the inner wall of the connecting pipe and connected to the spiral slide. A slider is fixedly installed on the outside of the sliding cylinder. A cavity is opened on the fixing bar. A third spring is fixedly connected inside the cavity. A top block is slidably connected inside the cavity. An aeration pipe is fixedly connected to the bottom of the air supply pipe.

[0005] Preferably, the outside of the connecting pipe has a rectangular opening that communicates with the linear slide, the fixing strip is fixedly installed inside the rectangular opening, and the top block is fixedly connected to the third spring.

[0006] Preferably, the outer side of the top block adopts an arc-shaped structure, both ends of the fixing strip are provided with exhaust chambers, and the two inner walls of the cavity are provided with vents that communicate with the exhaust chambers at equal intervals.

[0007] Preferably, a movable plate is movably connected to the outer end of the slide cylinder, and the slide cylinder is fixedly connected to the second spring through the movable plate. The spiral slide, the linear slide, and the slider all adopt a hemispherical structure.

[0008] Preferably, the outer side of the connecting pipe has an opening that communicates with the inside of the connecting pipe, and the gas supply pipe is slidably connected inside the opening and passes through the middle of the second spring and is fixedly connected to the side of the movable plate.

[0009] Preferably, the air supply pipe and the inlet are both square-shaped, the upper end of the aeration pipe is provided with aeration holes on both sides, the gate body is provided with limit channels at both ends, and the connection between the connecting pipe and the connecting pipe is located inside the limit channel.

[0010] Preferably, a limiting plate that is slidably connected inside the fixed cylinder is fixedly connected to the outer side of the adjusting rod, the adjusting rod passes through the middle of the first spring and the limiting plate is fixedly connected to the first spring, and the first spring is connected to the vent pipe.

[0011] Preferably, a limiting slider is fixedly installed on the outer side of the adjusting rod, and a limiting groove is equidistantly formed on the inner side of the upper end of the arc-shaped side plate, wherein the limiting groove adopts an arc-shaped structure.

[0012] The beneficial effects of this invention are as follows:

[0013] 1. The invention starts the air injection device by supplying air to the connecting pipes at both ends through the connecting pipes at both ends. The gas inside the connecting pipe is introduced into the aeration pipe through the air supply pipe and finally emerges through the aeration holes. The continuously emerging gas will continuously agitate the water, making the water in this area less likely to freeze. Since a buoyancy plate is installed at the bottom of the connecting pipe, the buoyancy plate can rise and fall with the rise and fall of the water level, thereby pulling the connecting pipe to slide along the limiting groove for stable rise and fall, so that the aeration pipe always maintains a certain distance from the liquid surface, ensuring that the gas can stably agitate the water through the aeration holes, which can effectively prevent freezing.

[0014] 2. In this invention, when gas enters the connecting pipe through the connecting tube, the gas output through the aeration hole is less than the gas supply, causing the gas pressure inside the connecting pipe to gradually increase. This pushes the slide cylinder to slide, causing the slider to slide along the spiral track and compress the second spring to give it elasticity. When the slider reaches the end of the connection between the straight track and the spiral track, it squeezes the top block, causing it to retract into the cavity and compressing the third spring to give it elasticity. At this point, the vent will be exposed, and some of the gas inside the connecting pipe will enter the exhaust chamber through the vent and be discharged to the outside. This gas can also increase the external aeration rate, thereby reducing the gas pressure inside the connecting pipe. As pressure is continuously released, the elastic second spring pushes the slide cylinder, causing the slider to slide along the straight slide. When the slider reaches the connection point between the spiral slide and the beginning of the straight slide, it directly enters the spiral slide. The elastic third spring then pushes the top block to extend and block the air vents on both sides, preventing further air leakage. The air pressure inside the connecting pipe gradually increases, pushing the slide cylinder to move. During this reciprocating motion, the air supply pipe drives the aeration pipe to reciprocate. The gas emerging from the aeration holes can create splashes over a larger area, thereby expanding the non-icing area between the gate body and the river water, making it unaffected by ice resistance when opening.

[0015] 3. When the air injection device of this invention starts working and supplies air into the connecting pipe, it also supplies air into the vent pipe. Some of the gas inside the vent pipe will directly push the limiting plate to slide along the inside of the fixed cylinder and squeeze the first spring to make it elastic. When the adjusting rod extends outward, it will slide along the limiting groove through the limiting ball, and make the arc-shaped side plate extend outward with the hinge point with the gate body as the center. This allows mud and other debris to accumulate on the outside of the arc-shaped side plate during the water storage process. Before starting the gate body to flip, the air injection device will stop supplying air, and the elastic first spring will push the limiting plate to reset along the inside of the fixed cylinder, thereby driving the adjusting rod to retract into the fixed cylinder. This will pull the arc-shaped side plate to contract inward with the hinge point with the gate body as the center, so that a gap is formed between the outside of the arc-shaped side plate and the accumulated mud and sand layer. When the gate body is started to flip, it will not be subject to greater resistance from the mud and sand layer, making the flipping easier. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 This is a diagram illustrating the accumulation of sediment on the outside of the gate body in the prior art of this invention;

[0018] Figure 3 This is a diagram illustrating the accumulation of sediment on the outside of the gate body in this invention and technical solution.

[0019] Figure 4This is a schematic diagram showing the arc-shaped side plate inside the vent pipe of the present invention in contact with mud and sand when it is inflated.

[0020] Figure 5 This is a schematic diagram showing the arc-shaped side plate inside the vent pipe of the present invention in contact with mud and sand when it is not inflated;

[0021] Figure 6 This is a top view of the present invention;

[0022] Figure 7 This is a schematic cross-sectional view of the gate body of the present invention;

[0023] Figure 8 This is a schematic diagram of the cross-sectional structure of the connecting pipe of the present invention;

[0024] Figure 9 This is a schematic diagram showing the positions of the spiral slide and the straight slide of the present invention;

[0025] Figure 10 This is a schematic diagram of the slider position in this invention;

[0026] Figure 11 This is a schematic cross-sectional view of the connection between the slider and the linear slide rail of the present invention.

[0027] Figure 12 For the present invention Figure 11 Enlarged diagram of point A in the middle.

[0028] The attached diagram lists the components represented by each number as follows:

[0029] 1. Gate body; 2. Arc-shaped side plate; 201. Limiting slide groove; 3. Air injection device; 4. Connecting pipe; 5. Connecting pipe; 501. Through port; 502. Rectangular opening; 6. Buoyancy plate; 7. Air supply pipe; 8. Aeration pipe; 801. Aeration hole; 9. Ventilation pipe; 10. Fixed cylinder; 11. First spring; 12. Adjusting rod; 121. Limiting ball; 122. Limiting plate; 13. Slide cylinder; 131. Movable plate; 14. Second spring; 15. Spiral slide; 16. Straight slide; 17. Sliding block; 18. Fixed bar; 181. Cavity; 182. Ventilation port; 183. Exhaust chamber; 19. Top block; 20. Third spring. Detailed Implementation

[0030] 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.

[0031] like Figures 1 to 12As shown, this embodiment of the invention provides an anti-freeze flap gate, including a gate body 1, an air supply pipe 7, and a fixing strip 18. An arc-shaped side plate 2 is movably hinged to the lower end of the gate body 1. A fixing cylinder 10 is fixedly connected to the side of the lower end of the gate body 1. A first spring 11 is fixedly connected inside the fixing cylinder 10. An adjusting rod 12 is movably connected inside the fixing cylinder 10. An air injection device 3 is fixedly installed on the top of the gate body 1. Connecting pipes 4 communicating with the air injection device 3 are fixedly installed inside both ends of the gate body 1. A connecting pipe 5 is movably connected inside the connecting pipe 4. The bottom of the air injection device 3 is fixedly connected to the connecting pipes 4 at both ends. A ventilating pipe 9 is connected to the bottom of the outer end of the connecting pipe 5. A buoyancy plate 6 is fixedly installed at the bottom of the outer end of the connecting pipe 5. A sliding cylinder 13 is movably connected inside the connecting pipe 5. A second spring 14 is fixedly connected to the outer side of the sliding cylinder 13 and is fixedly connected to the inner wall of the connecting pipe 5. A spiral slide 15 is opened on the inner wall of the connecting pipe 5. A straight slide 16 connected to the spiral slide 15 is opened on the inner wall of the connecting pipe 5. A slider 17 is fixedly installed on the outside of the sliding cylinder 13. A cavity 181 is opened on the fixing bar 18. A third spring 20 is fixedly connected inside the cavity 181. A top block 19 is slidably connected inside the cavity 181. An aeration pipe 8 is fixedly connected to the bottom of the air supply pipe 7.

[0032] The working principle and beneficial effects of the above technical solution are as follows: Air is supplied to the connecting pipes 5 at both ends through the connecting pipes 4. The gas inside the connecting pipes 5 is introduced into the aeration pipe 8 through the air supply pipe 7 and finally emerges through the aeration hole 801. The continuously emerging gas constantly agitates the water, making the water in this area less prone to freezing. The buoyancy plate 6 can rise and fall with the water level, thereby pulling the connecting pipe 5 to slide stably along the limiting channel, ensuring that the aeration pipe 8 always maintains a certain distance from the liquid surface, guaranteeing that the gas can stably agitate the water through the aeration hole 801, effectively preventing freezing. When the gas enters the connecting pipe 5 through the connecting pipes 4, the amount of gas exiting through the aeration hole 801 is less than the amount supplied. As the air pressure inside the connecting pipe 5 gradually increases, it pushes the slide cylinder 13 to slide, causing the slider 17 to slide along the spiral slide 15 and compress the second spring 14 to give it elasticity. When the slider 17 slides to the end of the connection between the straight slide 16 and the spiral slide 15, it squeezes the top block 19, causing it to retract into the cavity 181 and compressing the third spring 20 to give it elasticity. At this time, the vent 182 will be exposed, and some of the gas inside the connecting pipe 5 will enter the exhaust chamber 183 through the vent 182 and be discharged to the outside, thereby reducing the air pressure inside the connecting pipe 5. As the pressure continues to decrease, the elastic second spring 14 will push the slide cylinder 13, causing the slider 17 to slide along the straight slide 16. When the slider 17 slides to the end of the connection between the spiral slide 15 and the straight slide 16, it will push the slide cylinder 13 to slide, causing the slider 17 to slide along the straight slide 16. When the line slide 16 is connected at the beginning, it will directly enter the spiral slide 15. The elastic third spring 20 will push the top block 19 to extend and block the air vents 182 on both sides, preventing air leakage. The air pressure inside the connecting pipe 5 will gradually increase, pushing the slide cylinder 13 to move. During this reciprocating motion, the air supply pipe 7 will drive the aeration pipe 8 to reciprocate. The gas coming out of the aeration hole 801 can agitate water in a larger area, thereby expanding the non-icing area between the gate body 1 and the river water. The air injection device 3 will also supply air into the air vent 9. Some of the gas inside the air vent 9 will directly push the limit plate 122 to slide along the inside of the fixed cylinder 10 and squeeze the first spring 11 to make it elastic. The adjusting rod 12 moves outward. When extended, the limiting slider 121 slides along the limiting groove 201, causing the arc-shaped side plate 2 to extend outward with the hinge point with the gate body 1 as the center. This allows silt and other debris to accumulate on the outside of the arc-shaped side plate 2 during water storage. Before the gate body 1 is started to flip, the air injection device 3 stops supplying air, and the elastic first spring 11 pushes the limiting plate 122 to reset along the inside of the fixed cylinder 10, thereby driving the adjusting rod 12 to retract into the fixed cylinder 10. This pulls the arc-shaped side plate 2 to contract inward with the hinge point with the gate body 1 as the center, creating a gap between the outside of the arc-shaped side plate 2 and the accumulated silt layer. When the gate body 1 is started to flip, it will not be subject to greater resistance from the silt layer, making the flipping process easier.

[0033] like Figure 9 , 11 As shown in Figures 1 and 12, in one embodiment, a rectangular opening 502 communicating with the linear slide 16 is provided on the outside of the connecting pipe 5. The fixing strip 18 is fixedly installed inside the rectangular opening 502, and the top block 19 is fixedly connected to the third spring 20.

[0034] The working principle and beneficial effects of the above technical solution are as follows: When the slider 17 slides along the inside of the straight slide 16, it will squeeze the top block 19, causing it to retract into the cavity 181 and squeezing the third spring 20 to give it elasticity. The vent 182 will then be exposed, and some of the gas inside the connecting pipe 5 will enter the exhaust chamber 183 through the vent 182 and be discharged to the outside, thereby reducing the air pressure inside the connecting pipe 5. When the slider 17 slides to the connection point between the spiral slide 15 and the beginning of the straight slide 16, it will... If the air enters directly into the spiral slide 15, the elastic third spring 20 will push the top block 19 to extend and block the air vents 182 on both sides, preventing air leakage. The air pressure inside the connecting pipe 5 will gradually increase, pushing the slide cylinder 13 to move. In this way, the slide cylinder 13 will reciprocate, thereby driving the aeration pipe 8 to reciprocate through the air supply pipe 7. The gas coming out of the aeration hole 801 can agitate water in a larger area, thereby expanding the non-icing area between the gate body 1 and the river water.

[0035] like Figure 12 As shown, in one embodiment, the outer side of the top block 19 adopts an arc-shaped structure, and both ends of the fixing strip 18 are provided with exhaust chambers 183. The two inner walls of the cavity 181 are provided with vents 182 that communicate with the exhaust chambers 183 at equal intervals.

[0036] The working principle and beneficial effects of the above technical solution are as follows: Since the top block 19 adopts an arc-shaped structure, when the slider 17 squeezes the top block 19 to retract into the cavity 181, the vents 182 on both sides will be exposed. The gas inside the connecting pipe 5 enters the exhaust chamber 183 through the vents 182 and is discharged to the outside, thus achieving pressure relief. The continuous structure is very convenient and efficient.

[0037] like Figure 8 As shown, in one embodiment, a movable plate 131 is movably connected to the outer end of the slide cylinder 13, and the slide cylinder 13 is fixedly connected to the second spring 14 through the movable plate 131. The spiral slide 15, the straight slide 16 and the slider 17 all adopt a hemispherical structure.

[0038] The working principle and beneficial effects of the above technical solution are as follows: The spiral slide 15 is spiral-shaped and has a ring on the inner wall of the connecting pipe 5. The straight slide 16 is connected to the beginning and end of the spiral slide 15, which is called an integral slide. When the slide cylinder 13 slides along the inside of the spiral slide 15 by the slider 17, the slide cylinder 13 will rotate slowly. With the presence of the movable plate 131, the second spring 14 can remain stationary, ensuring the stability of the cooperation between the various structures. Through the hemispherical spiral slide 15, straight slide 16 and slider 17, it can be ensured that the slider 17 can slide stably inside the spiral slide 15 and straight slide 16.

[0039] like Figure 1 , 8 As shown, in one embodiment, a port 501 is provided on the outside of the connecting pipe 5, which is connected to the inside of the connecting pipe 5. The gas supply pipe 7 is slidably connected inside the port 501 and passes through the middle of the second spring 14 and is fixedly connected to the side of the movable plate 131.

[0040] The working principle and beneficial effects of the above technical solution are as follows: During the sliding process, the slide cylinder 13 will drive the gas supply pipe 7 to slide along the inlet 501, while compressing the second spring 14. The various structures are connected and cooperate with each other, but do not interfere with each other's work, making the whole process very smooth.

[0041] like Figure 1 As shown, in one embodiment, both the gas supply pipe 7 and the inlet 501 adopt a regular quadrilateral structure. Aeration holes 801 are provided on both sides of the upper end of the aeration pipe 8. Limiting channels are provided at both ends of the gate body 1. The connection between the connecting pipe 5 and the connecting pipe 4 is located inside the limiting channel.

[0042] The working principle and beneficial effects of the above technical solution are as follows: the gas supply pipe 7 and the inlet 501 can limit each other, so that the gas supply pipe 7 will not rotate during the movement, but can only move laterally; the gas introduced into the aeration pipe 8 will emerge through the aeration hole 801, and the continuously emerging gas will continuously agitate the water, making the water in this area less likely to freeze; due to the existence of the limiting channel, it can provide a limiting effect for the connecting pipe 5, so that it can stably rise and fall along the limiting channel during the lifting and lowering process, ensuring the stability of its operation.

[0043] like Figure 4 , 5 As shown, in one embodiment, a limiting plate 122 that is slidably connected inside the fixed cylinder 10 is fixedly connected to the outer side of the adjusting rod 12. The adjusting rod 12 passes through the middle of the first spring 11 and the limiting plate 122 is fixedly connected to the first spring 11. The first spring 11 is connected to the vent pipe 9.

[0044] The working principle and beneficial effects of the above technical solution are as follows: some of the gas inside the vent pipe 9 will directly push the limiting plate 122 to slide along the inside of the fixed cylinder 10 and squeeze the first spring 11 to make it elastic, thereby causing the adjusting rod 12 to extend outward. When there is no gas supply inside the vent pipe 9, the elastic first spring 11 will push the limiting plate 122 to reset and cause the adjusting rod 12 to retract into the fixed cylinder 10, making reciprocating adjustment convenient.

[0045] like Figure 4 , 5 As shown, in one embodiment, a limiting ball 121 is fixedly installed on the outer side of the adjusting rod 12, and a limiting groove 201 is equidistantly opened on the inner side of the upper end of the arc-shaped side plate 2. The limiting groove 201 adopts an arc-shaped structure.

[0046] The working principle and beneficial effects of the above technical solution are as follows: the limiting ball 121 is slidably engaged inside the limiting groove 201. When the adjusting rod 12 extends outward, it will slide along the limiting groove 201 through the limiting ball 121, and cause the arc-shaped side plate 2 to extend outward with the hinge point with the gate body 1 as the center, making adjustment and use very convenient.

[0047] Working principle and usage process:

[0048] First, the air injection device 3 is activated and supplies air to the connecting pipes 5 at both ends through the connecting pipes 4 at both ends. It also supplies air to the vent pipe 9. The gas inside the connecting pipe 5 is introduced into the aeration pipe 8 through the air supply pipe 7 and finally emerges through the aeration hole 801. The continuously emerging gas will continuously stir up water splashes, making the water in this area less likely to freeze. Some of the gas inside the vent pipe 9 will directly push the limiting plate 122 to slide along the inside of the fixed cylinder 10 and squeeze the first spring 11 to make it elastic. When the adjusting rod 12 extends outward, it will slide along the limiting slide groove 201 through the limiting ball 121, and make the arc-shaped side plate 2 extend outward with the hinge point with the gate body 1 as the center.

[0049] Because the bottom of the connecting pipe 5 is equipped with a buoyancy plate 6, the buoyancy plate 6 can rise and fall with the rise and fall of the water level, thereby pulling the connecting pipe 5 to slide along the limiting channel for stable rise and fall, so that the aeration pipe 8 always maintains a certain distance from the liquid surface, ensuring that the gas can stably agitate water droplets through the aeration hole 801.

[0050] When the gas inside the connecting pipe 4 enters the connecting pipe 5, the gas output through the aeration hole 801 is less than the gas supply, so the gas pressure inside the connecting pipe 5 gradually increases, which will push the slide cylinder 13 to slide, causing the slider 17 to slide along the spiral slide 15 and compress the second spring 14 to make it elastic.

[0051] When the slider 17 slides to the end of the connection between the straight slide 16 and the spiral slide 15, it will squeeze the top block 19 to retract into the cavity 181 and squeeze the third spring 20 to make it elastic. At this time, the vent 182 will be exposed, and some of the gas inside the connecting pipe 5 will enter the exhaust chamber 183 through the vent 182 and be discharged to the outside, thereby reducing the air pressure inside the connecting pipe 5.

[0052] As the pressure is continuously released, the elastic second spring 14 will push the slide cylinder 13 to make the slider 17 slide along the straight slide 16. When the slider 17 slides to the connection point between the spiral slide 15 and the beginning of the straight slide 16, it will directly enter the spiral slide 15. Then the elastic third spring 20 will push the top block 19 to extend and block the air vents 182 on both sides, preventing air leakage. The air pressure inside the connecting pipe 5 will gradually increase and push the slide cylinder 13 to move. In this reciprocating motion, the air supply pipe 7 will drive the aeration pipe 8 to reciprocate. The gas coming out of the aeration hole 801 can agitate water in a larger area, thereby expanding the non-icing area between the gate body 1 and the river water.

[0053] When it is necessary to start the gate body 1 to flip, the air supply of the air injection device 3 can be stopped first. Then the elastic first spring 11 will push the limit plate 122 to reset along the inside of the fixed cylinder 10, thereby driving the adjusting rod 12 to retract into the inside of the fixed cylinder 10. This will pull the arc-shaped side plate 2 to retract inward with the hinge point with the gate body 1 as the center, so that a gap is formed between the outer side of the arc-shaped side plate 2 and the accumulated mud and sand layer. When the gate body 1 is started to flip, it will not be subject to greater resistance from the mud and sand layer, making the flipping easier.

[0054] It should be noted that, in this document, relational terms such as "first" and "second" are used only 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 process, method, article, or apparatus.

[0055] 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. A frost-resistant flap gate, comprising a gate body (1), an air supply pipe (7), and a fixing strip (18), characterized in that: The lower end of the gate body (1) is movably hinged with an arc-shaped side plate (2). A fixed cylinder (10) is fixedly connected to the side of the lower end of the gate body (1). A first spring (11) is fixedly connected inside the fixed cylinder (10). An adjusting rod (12) is movably connected inside the fixed cylinder (10). An air injection device (3) is fixedly installed on the top of the gate body (1). Connecting pipes (4) connected to the air injection device (3) are fixedly installed inside both ends of the gate body (1). A connecting pipe (5) is movably connected inside the connecting pipe (4). A vent pipe (9) connected to the connecting pipes (4) at both ends is fixedly connected to the bottom of the air injection device (3). A float is fixedly installed at the bottom of the outer end of the connecting pipe (5). The force plate (6) is connected to the inside of the connecting pipe (5) with a sliding cylinder (13). The outer side of the sliding cylinder (13) is fixedly connected to a second spring (14) which is fixedly connected to the inner wall of the connecting pipe (5). A spiral slide (15) is opened on the inner wall of the connecting pipe (5). A straight slide (16) connected to the spiral slide (15) is opened on the inner wall of the connecting pipe (5). A slider (17) is fixedly installed on the outside of the sliding cylinder (13). A cavity (181) is opened on the fixing strip (18). A third spring (20) is fixedly connected inside the cavity (181). A top block (19) is slidably connected inside the cavity (181). An aeration pipe (8) is fixedly connected to the bottom of the air supply pipe (7). The outside of the connecting pipe (5) is provided with a rectangular opening (502) that communicates with the straight slide (16). The fixing strip (18) is fixedly installed inside the rectangular opening (502). The top block (19) is fixedly connected to the third spring (20). The outer side of the top block (19) adopts an arc-shaped structure, and both ends of the fixing strip (18) are provided with exhaust chambers (183). The two inner walls of the cavity (181) are provided with vents (182) that communicate with the exhaust chambers (183).

2. The anti-freeze flap gate according to claim 1, characterized in that: The outer end of the slide cylinder (13) is movably connected to a movable plate (131), and the slide cylinder (13) is fixedly connected to the second spring (14) through the movable plate (131). The spiral slide (15), the straight slide (16) and the slider (17) all adopt a hemispherical structure.

3. The anti-freeze flap gate according to claim 1, characterized in that: The outer side of the connecting pipe (5) is provided with a port (501) that communicates with its interior. The gas supply pipe (7) is slidably connected inside the port (501) and passes through the middle of the second spring (14) and is fixedly connected to the side of the movable plate (131).

4. The anti-freeze flap gate according to claim 1, characterized in that: The gas supply pipe (7) and the inlet (501) are both square structures. Aeration holes (801) are provided on both sides of the upper end of the aeration pipe (8). Limiting channels are provided at both ends of the gate body (1). The connection between the connecting pipe (5) and the connecting pipe (4) is located inside the limiting channel.

5. The anti-freeze flap gate according to claim 1, characterized in that: The adjusting rod (12) is fixedly connected to a limiting plate (122) that is slidably connected inside the fixed cylinder (10). The adjusting rod (12) passes through the middle of the first spring (11) and the limiting plate (122) is fixedly connected to the first spring (11). The first spring (11) is connected to the vent pipe (9).

6. The anti-freeze flap gate according to claim 1, characterized in that: A limiting ball (121) is fixedly installed on the outside of the adjusting rod (12), and a limiting groove (201) is provided at equal intervals on the inner side of the upper end of the arc-shaped side plate (2). The limiting groove (201) adopts an arc-shaped structure.

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