Air-actuated flap gate movement envelope zone anti-freezing system and control method

Abstract

The application discloses a kind of pneumatic flap gate movement envelope area anti-freezing system and control method, it is related to cold region hydraulic structure building anti-freezing technical field, including: concrete gate seat, concrete side pier being set in the both sides of the concrete gate seat, steel gate and main air bag, and side pier heating assembly, inflatable active side water stop and detection and control module, the inflatable active side water stop is set in the side edge of the steel gate, expands and compacts the heating working surface in the water retaining state, and unloads pressure and is contracted before the steel gate rotates and forms operating gap with the heating working surface.The application can cover gate side edge movement envelope area, and make partition preheating, active side water stop release, drainage confirmation and main air bag action form closed loop.

Description

Technical Field

[0001] This invention relates to the field of antifreeze technology for hydraulic structures in cold regions, and more specifically to an antifreeze system and control method for the motion envelope of a pneumatic flap gate. Background Technology

[0002] A pneumatic flap gate typically consists of a steel gate, a bottom hinged structure, a main airbag located on the backwater side of the gate, a limit strap, and a matching control device. When the main airbag is inflated, it pushes the steel gate up to block water; when the main airbag is deflated, the steel gate collapses downstream to release water under water pressure, its own weight, or auxiliary forces.

[0003] When operating in cold regions, ice, snow accumulation, or freezing can easily occur on the side edges of the steel gate, the working surface of the concrete pier, the bottom hinge, the area near the main airbag, the gate's collapse support area, the water-stop contact surface, and the lowest drainage point. These phenomena may significantly increase the resistance to gate opening and closing, leading to the gate failing to rise or descend, tearing of the water-stop, or abnormal stress on the main airbag.

[0004] The bottom-hinged pneumatic flap gate does not move along a straight gate slot, but rotates around the bottom hinge axis. During the entire opening and closing process, the gate's side edge sweeps across the working surface of the side pier, forming a fan-shaped or fan-shaped motion envelope. Simply placing heating devices at the water-blocking position, the collapsed position, or a fixed local location cannot guarantee that the entire area subsequently traversed by the gate's side edge has been thawed.

[0005] When a fixed, clamping side stop is used, the stop working part continuously rubs against the working surface of the side pier during the opening and closing of the gate; under low temperature conditions, the stop working part may also freeze and stick to the ice layer or the surface of the side pier. If the gate is driven before the freezing and sticking is removed, it can easily cause damage to the stop, gate jamming, or overload of the drive system.

[0006] Furthermore, the side pier heating, gate seat heating, drainage and de-icing, active side water stop release, main airbag operation, and energy supply are usually completed by different devices, lacking safety interlocking logic for coordinated control based on the current gate position, target position, and actual thawing status. Therefore, how to provide a pneumatic flap gate motion envelope antifreeze system and control method that can cover the side edge motion envelope area of ​​the gate and form a closed loop of zone preheating, active side water stop release, drainage confirmation and main airbag action is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] In view of this, the present invention provides an antifreeze system and control method for the motion envelope area of ​​a pneumatic flap gate, which aims to solve one of the problems in the above-mentioned background art, and can cover the motion envelope area of ​​the gate side edge, and form a closed loop of zone preheating, active side water stop release, drainage confirmation and main airbag action.

[0008] To achieve the above objectives, in one aspect, the present invention provides an anti-freezing system for the motion envelope area of ​​a pneumatic flap gate, comprising: The system comprises a concrete gate seat, concrete side piers on both sides of the concrete gate seat, a steel gate, and a main airbag. The bottom of the steel gate is rotatably connected to the concrete gate seat via a bottom hinge. The main airbag is located on the backwater side of the steel gate and is used to drive the steel gate to rotate between the water-blocking position and the collapsed position. The concrete gate seat is provided with a foundation anchor, and the steel gate is provided with an upper gate connecting seat. The concrete pier is equipped with a side pier heating component, an expandable active side water stop, and a detection and control module. At least one of the concrete side piers is provided with the side pier heating component on its working surface facing the steel gate. The side pier heating component has a heating working surface facing the side edge of the steel gate. The heating working area of ​​the heating working surface covers the motion envelope area formed by the side edge of the steel gate rotating between the water-blocking position and the collapsed position. The expandable active side water stop is installed on the side edge of the steel gate. It expands and presses against the heated working surface when blocking water. Before the steel gate rotates, it is depressurized and retracts to form an operating gap with the heated working surface. The detection and control module determines the target motion envelope region based on the current position and target position of the steel gate, controls the side pier heating component to preheat the target motion envelope region, and outputs a gate action permission signal to release the gate action lock after confirming that the target motion envelope region has reached the preset thawing conditions and the expandable active side water stop has been released in place, so as to allow the main airbag to drive the steel gate to rotate.

[0009] Furthermore, the motion envelope region is defined as a continuous area formed by the side edge of the steel gate sweeping across the working surface of the concrete pier as the steel gate rotates around the rotation axis of the bottom hinge from the water-blocking position to the collapsed position; the concrete pier is widened along the collapsed direction of the steel gate so that the motion envelope region is completely located within the working surface of the concrete pier.

[0010] Furthermore, the side pier heating assembly includes a side pier heating base plate, a heating channel, and a thermal insulation layer. The side pier heating base plate forms the heating working surface on the side facing the steel gate. The heating channel is disposed inside the side pier heating base plate, and the thermal insulation layer is disposed on the side of the side pier heating base plate away from the heating working surface.

[0011] Furthermore, the expandable active side waterstop includes a waterstop fixing seat, a waterstop pressure plate, an elastic hollow bladder, a sealing working part, and a medium interface. The waterstop fixing seat is disposed on the side edge of the steel gate, the waterstop pressure plate fixes the elastic hollow bladder on the waterstop fixing seat, the sealing working part is disposed on the side of the elastic hollow bladder facing the heating working surface, and the medium interface communicates with the inner cavity of the elastic hollow bladder.

[0012] Furthermore, it also includes a gate seat heating assembly, which is disposed on the upper surface of the concrete gate seat and covers or is adjacent to the area where the bottom hinge is located, the area below the main airbag, and the collapse support area of ​​the steel gate.

[0013] Furthermore, it also includes a drainage component, which is located at the lowest point of the working surface of the concrete gate seat and the concrete side pier. The drainage component includes a drainage channel and a drainage hole communicating with the drainage channel, and at least one section of the drainage component is provided with a heated drainage section.

[0014] Furthermore, it also includes a limiting component, which includes a limiting strap, an upper connecting piece for the limiting strap, and a lower anchoring piece for the limiting strap. One end of the limiting strap is connected to the upper connecting seat of the gate through the upper connecting piece for the limiting strap, and the other end of the limiting strap is connected to the foundation anchor through the lower anchoring piece for the limiting strap, which is used to limit the maximum water-blocking position of the steel gate.

[0015] On the other hand, the present invention provides a method for preventing freezing in the motion envelope area of ​​a pneumatic flap gate, based on the aforementioned anti-freezing system for the motion envelope area of ​​a pneumatic flap gate, specifically including the following steps: Step 1: Collect ambient temperature, working surface temperature of the heated side pier, gate seat temperature, current position of the steel gate, active side water-stopping status, and drainage status. Step 2: Receive the target opening / closing command, and determine the target motion envelope sub-region corresponding to the subsequent rotation of the steel gate based on the current position of the steel gate and the target position; Step 3: When the ambient temperature is lower than the first set value or the temperature of the target motion envelope sub-region is lower than the second set value, the side pier heating zone and gate seat heating assembly corresponding to the target motion envelope sub-region are activated. Step 4: Determine whether the target motion envelope region has reached the preset thawing condition. The preset thawing condition is that the temperature of the target motion envelope region reaches a third set value and remains at a set time, and the drainage component detects the discharge of melt water. Step 5: After the preset thawing conditions are met, the expandable active side water stop is depressurized and retracted. Step six: After confirming that the expandable active side water stop is released in place, drainage is normal, and there is no malfunction that prevents operation, control the main airbag to inflate or deflate, so that the steel gate rotates toward the target position.

[0016] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a pneumatic flap gate motion envelope zone antifreeze system and control method, the beneficial effects of which are: 1) The side pier heating working area covers the motion envelope area of ​​the gate side edge, which can actively thaw the positions that the gate may pass through on the opening and closing path this time, and prevent the gate from entering the unthawed area; 2) The active side water stop expands and tightens when blocking water, and depressurizes and retracts before opening and closing, which can take into account both water blocking and sealing and low friction operation, and reduce the risk of the water stop being forcibly dragged after freezing and sticking. 3) The detection and control module forms a safety interlock between the target area preheating, thawing judgment, water stop release, drainage confirmation and main airbag action, which helps to avoid the gate action when it is not thawed or the water stop is not released; 4) The side pier heating assembly works in conjunction with the gate seat heating assembly and drainage assembly to improve the low temperature conditions of the gate side edge, bottom hinge, main airbag adjacent area, collapse support area and drainage low point. 5) Zoned heating and multi-energy coupling can be scheduled on demand according to target actions and energy status, reducing ineffective energy consumption and improving the operational support capability of projects in remote and cold regions. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1 A schematic diagram of the antifreeze system for the motion envelope zone of the pneumatic flap gate provided by the present invention; Figure 2 This is a schematic diagram of the side pier heating assembly and motion envelope partition provided by the present invention; Figure 3A This is a schematic diagram of the structure of the pressurized expansion sealing state provided by the present invention; Figure 3B This is a schematic diagram of the structure of the pressure relief and retraction release state provided by the present invention; Figure 4 A schematic diagram of the gate bottom antifreeze, drive and drainage structure provided by the present invention; Figure 5A partial structural diagram of the gate upper connection and limiting assembly provided by the present invention; Figure 6 A schematic diagram of the antifreeze heating medium circulation system provided by the present invention; Figure 7 The active antifreeze and gate opening and closing interlock control flowchart provided by the present invention; Figure 8 A schematic diagram of the multi-energy coupling power supply system provided by the present invention; Figure 9 This is a schematic diagram of the energy management and safety control logic provided by the present invention.

[0019] Wherein: 1 is a concrete gate seat; 2 is a concrete side pier; 3 is a steel gate; 31 is an upper connecting seat for the gate; 4 is a bottom hinge; 5 is a main airbag; 61 is a limiting strap; 62 is an upper connecting piece for the limiting strap; 63 is a lower anchor piece for the limiting strap; 7 is a base plate; 8 is a gate seat heating assembly; 9 is a drainage assembly; 10 is a side pier heating assembly; 101 is a side pier heating seat plate; 102 is a heating channel; 103 is a heating working surface; 104 is a thermal insulation layer; 105 is the first heating zone; 106 is the second heating zone; 107 is the third heating zone; 1 08 is the fourth heating zone; 109 is the fifth heating zone; 11 is the expandable active side water stop; 111 is the water stop fixing seat; 112 is the water stop pressure plate; 113 is the elastic hollow bladder; 114 is the sealing working part; 115 is the medium interface; 116 is the operating clearance; 12 is the basic anchor seat; 13 is the detection and control module; 14 is the heating circulation system; 141 is the storage tank; 142 is the heater; 143 is the circulation pump; 144 is the heating pipeline; 145 is the return pipeline; 146 is the distribution valve group; 147 is the return valve group; 15 is the multi-energy coupling power supply system. Detailed Implementation

[0020] 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.

[0021] See Figure 1-5 This invention discloses an antifreeze system for the motion envelope zone of a pneumatic flap gate, comprising: The system includes a concrete gate seat 1, concrete side piers 2 on both sides of the concrete gate seat 1, a steel gate 3, and a main airbag 5. The bottom of the steel gate 3 is rotatably connected to the concrete gate seat 1 through a bottom hinge 4. The main airbag 5 is located on the back side of the steel gate 3 and is used to drive the steel gate 3 to rotate between the water-blocking position and the collapsed position. The concrete gate seat 1 is equipped with a foundation anchor seat, and the steel gate 3 is equipped with an upper gate connecting seat. The airbag is supported on the bottom plate of the concrete gate seat 1. In addition to the side pier heating component 10, the expandable active side water stop 11 and the detection and control module 13, at least one concrete side pier 2 is provided with a side pier heating component 10 on the working surface facing the steel gate 3. The side pier heating component 10 has a heating working surface 103 facing the side edge of the steel gate 3. The heating working area of ​​the heating working surface 103 covers the motion envelope area formed by the side edge of the steel gate 3 rotating between the water-blocking position and the collapsed position. An expandable active side water stop 11 is installed on the side edge of the steel gate 3. It expands and presses against the heated working surface 103 when blocking water. Before the steel gate 3 rotates, it is depressurized and retracted to form an operating gap with the heated working surface 103. The detection and control module 13 determines the target motion envelope sub-region based on the current position and target position of the steel gate 3, controls the side pier heating component 10 to preheat the target motion envelope sub-region, and outputs a gate action permission signal to release the gate action lock after confirming that the target motion envelope sub-region has reached the preset thawing conditions and the expandable active side water stop 11 has been released in place, so as to allow the main airbag 5 to drive the steel gate 3 to rotate. The gate action lock is a software interlock logic in the detection and control module. When the thawing conditions and water stop release conditions are not met, the output of action commands to the main airbag control valve is prohibited.

[0022] In this embodiment, the motion envelope region is defined as a continuous area formed by the side edge of the steel gate 3 sweeping across the working surface of the concrete pier 2 as the steel gate 3 rotates around the rotation axis of the bottom hinge 4 from the water-blocking position to the collapsed position; the concrete pier 2 is widened along the collapsed direction of the steel gate 3 so that the motion envelope region is completely located within the working surface of the concrete pier 2.

[0023] In this embodiment, the side pier heating assembly 10 includes a side pier heating base plate 101, a heating flow channel 102, and a thermal insulation layer 104. The side pier heating base plate 101 forms a heating working surface 103 on the side facing the steel gate 3. The heating flow channel 102 is disposed inside the side pier heating base plate 101, and the thermal insulation layer 104 is disposed on the side of the side pier heating base plate 101 away from the heating working surface 103. The side pier heating assembly 10 is divided into two or more heating zones that can independently supply heat and independently detect temperature along the rotation direction of the steel gate 3. The heating zones include a first heating zone 105, a second heating zone 106, a third heating zone 107, a fourth heating zone 108, and a fifth heating zone 109. The detection and control module 13 prioritizes controlling the heating zone corresponding to the target motion envelope region and at least one adjacent safety heating zone for preheating. Each heating zone is provided with a heating branch, a return branch, and a temperature detection element, and is independently controlled by a distribution valve group 146 and a return valve group 147. Adjacent zones can transition continuously or have thermal barriers set to reduce mutual interference during zone control. Each heating zone is divided along the rotation direction of the steel gate 3 by an equal angle or by the difference in heat load within the motion envelope region. Each heating zone has an independent regulating valve on its heating branch. The detection and control module 13 can independently adjust the flow rate of the heating medium in each zone according to the position and area of ​​the target motion envelope sub-region, thereby achieving on-demand heating. Further limitations on the number and division method of the zones can be added in the dependent claims.

[0024] In this embodiment, the expandable active side waterstop 11 includes a waterstop fixing seat 111, a waterstop pressure plate 112, an elastic hollow bladder 113, a sealing working part 114, and a medium interface 115. The waterstop fixing seat 111 is disposed on the side edge of the steel gate 3. The waterstop pressure plate 112 fixes the elastic hollow bladder 113 on the waterstop fixing seat 111. The sealing working part 114 is disposed on the side of the elastic hollow bladder 113 facing the heating working surface 103. The medium interface 115 communicates with the inner cavity of the elastic hollow bladder 113. Expandable active side waterstops 11 are respectively disposed on the two side edges of the steel gate 3. There are status detection elements for detecting the internal pressure of the elastic hollow bladder 113 and / or the release position of the sealing working part 114. The operating gap 116 is not less than the sum of the expected lateral displacement, manufacturing and installation deviation and thermal deformation during the opening and closing of the gate. The status detection elements are a pressure sensor set at the medium interface 115 and / or a displacement sensor set near the sealing working part 114. The pressure sensor is used to detect the internal pressure of the elastic hollow bladder 113 to determine whether the pressure has been released in place. The displacement sensor is used to detect the operating gap 116 between the sealing working part 114 and the heating working surface 103 to confirm that the water stop has been completely retracted.

[0025] exist Figure 3AIn the water-blocking state shown, the fluid medium enters the elastic hollow bladder 113 through the medium interface 115. The elastic hollow bladder 113 expands and pushes the sealing working part 114114 to press against the heated working surface 103, thereby forming a side edge seal. The heated working surface 103 serves not only as a heating surface but also as a sealing mating surface for the active side water stop 11. exist Figure 3B In the released state shown, the elastic hollow bladder 113 is depressurized through the medium interface 115, and the sealing working part 114 moves away from the heated working surface 103 by relying on the elastic recovery, retraction component or negative pressure, and forms an operating gap 116. The operating gap 116 should be able to accommodate the lateral displacement, manufacturing and installation deviation and thermal deformation of the steel gate 3 during the opening and closing process, and avoid the sealing working part 114 from continuously rubbing and heating the working surface 103.

[0026] In this embodiment, a gate seat heating assembly 8 is also included. The gate seat heating assembly 8 is disposed on the upper surface of the concrete gate seat 1 and covers or is adjacent to the area where the bottom hinge 4 is located, the area below the main airbag 5 and the overturning support area of ​​the steel gate 3, and is located below or near the base plate 7.

[0027] In this embodiment, a drainage component 9 is also included. The drainage component 9 is located at the lowest point of the working surface of the concrete gate seat 1 and the concrete side pier 2. The drainage component 9 includes a drainage channel and a drainage hole communicating with the drainage channel, and at least one section of the drainage component 9 is provided with a heated drainage section.

[0028] In this embodiment, a limiting component is also included. The limiting component includes a limiting strap 61, an upper end connector 62 of the limiting strap, and a lower end anchor 63 of the limiting strap. One end of the limiting strap 61 is connected to the upper connecting seat of the gate through the end connector on the limiting strap 61, and the other end of the limiting strap 61 is connected to the foundation anchor through the lower end anchor 62 of the limiting strap, which is used to limit the maximum water blocking position of the steel gate 3.

[0029] Additionally, in this embodiment, as Figure 6 As shown, it also includes a heating circulation system 14, which includes a storage tank 141, a heater 142, a circulation pump 143, a heating pipeline 144, a return pipeline 145, a distribution valve group 146, and a return valve group 147, for circulating and supplying antifreeze heating medium to at least one of the side pier heating assembly 10, the gate seat heating assembly 8, and the heating drainage section.

[0030] like Figure 7As shown, the detection and control module 13 includes at least three of the following: ambient temperature detection element, heating working surface 103 temperature detection element, gate seat temperature detection element, gate position detection element, active side water stop status detection element, and drainage status detection element, and is used to control the operation of heater 142, circulating pump 143, distribution valve group 146, return valve group 147, expandable active side water stop 11, and main airbag 5. The detection and control module 13 is also configured to: upon receiving the target opening and closing command, determine the target motion envelope sub-region based on the current position of the steel gate 3 and the target position; control the corresponding side pier heating zone and gate seat heating component 8 to preheat; after the target motion envelope sub-region reaches the preset thawing condition, depressurize and retract the expandable active side water stop 11; after confirming that the expandable active side water stop 11 is released in place, the drainage component 9 is working normally and there is no prohibition of action fault, output the gate action permission signal; and after the steel gate 3 reaches the target water blocking position, repressurize and seal the expandable active side water stop 11.

[0031] like Figure 8-9 As shown, it also includes a multi-energy coupling power supply module 15, which includes at least three of the following: a wind power generation unit, a photovoltaic power generation unit, an electric energy storage unit, a gas storage unit, a thermal energy storage unit, and an energy management controller, and uses mains power and / or emergency power as supplementary energy. The energy management controller is configured to allocate power to renewable energy sources, energy storage devices, and supplementary energy based on wind power, solar irradiance, energy storage status, heating demand, and aerodynamic load demand, and prioritize the release circuit of the detection and control module 13, the expandable active side water stop 11, and the gate safety interlock load. The heating working surface 103 includes a corrosion-resistant, wear-resistant, and thermally conductive metal layer or a composite thermally conductive layer. The sealing working part 114 is pressed tightly and sealed to the heating working surface 103 in the water-blocking state, and separates from the heating working surface 103 after the pressure is released by the expandable active side water stop 11. On the other hand, the present invention provides a method for preventing freezing in the motion envelope area of ​​a pneumatic flap gate, based on the above-mentioned anti-freezing system for the motion envelope area of ​​a pneumatic flap gate, specifically including the following steps: Step 1: Collect ambient temperature, temperature of the heated working surface 103 of the side pier, temperature of the gate seat, current position of the steel gate 3, active side water-stopping status, and drainage status. Step 2: Receive the target opening and closing command, and determine the target motion envelope sub-region corresponding to the subsequent rotation of the steel gate 3 based on the current position of the steel gate 3 and the target position; Step 3: When the ambient temperature is lower than the first set value or the temperature of the target motion envelope sub-region is lower than the second set value, start the side pier heating zone and gate seat heating component 8 corresponding to the target motion envelope sub-region; Step 4: Determine whether the target motion envelope region has reached the preset thawing condition. The preset thawing condition is that the temperature of the target motion envelope region reaches the third set value and continues for a set time, and the drainage component 9 detects the discharge of melt water. Step 5: After the preset thawing conditions are met, the expandable active side water stop 11 is depressurized and retracted. Step six: After confirming that the expandable active side water stop 11 is properly released, drainage is normal, and there are no malfunctions that prevent operation, control the main airbag 5 to inflate or deflate, causing the steel gate 3 to rotate towards the target position. The heating zone of the side pier corresponding to the target motion envelope region and at least one adjacent safety heating zone are given priority heating, and the heat supply of the subsequent heating zones is switched or adjusted in sequence according to the real-time position of the steel gate 3. If any of the following conditions are met: the target motion envelope area has not reached the preset thawing conditions, the expandable active side water stop 11 has not been released in place, the drainage status is abnormal, the main airbag 5 or the heating circulation system is faulty, or the gate position detection is abnormal, the gate opening and closing action shall be prohibited. After the steel gate 3 reaches the target water blocking position, the expandable active side water stop 11 shall be repressurized and sealed, and the heating system shall be switched to heat preservation operation, intermittent operation or stop state.

[0032] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0033] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pneumatic flap gate motion envelope zone antifreeze system, characterized in that, include: The concrete gate seat (1), the concrete side piers (2) set on both sides of the concrete gate seat (1), the steel gate (3) and the main airbag (5) are provided. The bottom of the steel gate (3) is rotatably connected to the concrete gate seat (1) through the bottom hinge (4). The main airbag (5) is set on the back side of the steel gate (3) and is used to drive the steel gate (3) to rotate between the water-blocking position and the collapsed position. The concrete gate seat (1) is provided with a foundation anchor (12). The steel gate (3) is provided with a gate upper connecting seat (31). The concrete pier (2) is provided with a side heating assembly (10), an expandable active side water stop (11), and a detection and control module (13). At least one of the concrete piers (2) is provided with the side heating assembly (10) on its working surface facing the steel gate (3). The side heating assembly (10) has a heating working surface (103) facing the side edge of the steel gate (3). The heating working area of ​​the heating working surface (103) covers the motion envelope area formed by the side edge of the steel gate (3) rotating between the water-blocking position and the collapsed position. The expandable active side water stop (11) is set on the side edge of the steel gate (3). It expands and presses the heating working surface (103) in the water-blocking state. Before the steel gate (3) rotates, it is depressurized and retracted to form an operating gap (116) with the heating working surface (103). The detection and control module (13) determines the target motion envelope sub-region based on the current position and target position of the steel gate (3), controls the side pier heating component (10) to preheat the target motion envelope sub-region, and outputs a gate action permission signal to release the gate action lock after confirming that the target motion envelope sub-region has reached the preset thawing condition and the expandable active side water stop (11) has been released in place, so as to allow the main airbag (5) to drive the steel gate (3) to rotate.

2. The anti-freezing system for the motion envelope zone of a pneumatic flap gate according to claim 1, characterized in that, The motion envelope region is defined as a continuous area formed by the side edge of the steel gate (3) sweeping across the working surface of the concrete side pier (2) as the steel gate (3) rotates around the rotation axis of the bottom hinge (4) from the water-blocking position to the collapsed position; the concrete side pier (2) is widened along the collapsed direction of the steel gate (3) so that the motion envelope region is completely located within the working surface of the concrete side pier (2).

3. The anti-freezing system for the motion envelope zone of a pneumatic flap gate according to claim 2, characterized in that, The side pier heating assembly (10) includes a side pier heating seat plate (101), a heating channel (102), and a thermal insulation layer (104). The side pier heating seat plate (101) forms the heating working surface (103) on the side facing the steel gate (3). The heating channel (102) is disposed inside the side pier heating seat plate (101). The thermal insulation layer (104) is disposed on the side of the side pier heating seat plate (101) away from the heating working surface (103).

4. The anti-freezing system for the motion envelope zone of a pneumatic flap gate according to claim 1, characterized in that, The expandable active side water stop (11) includes a water stop fixing seat (111), a water stop pressure plate (112), an elastic hollow bladder (113), a sealing working part (114), and a medium interface (115). The water stop fixing seat (111) is located on the side edge of the steel gate (3). The water stop pressure plate (112) fixes the elastic hollow bladder (113) on the water stop fixing seat (111). The sealing working part (114) is located on the side of the elastic hollow bladder (113) facing the heating working surface (103). The medium interface (115) communicates with the inner cavity of the elastic hollow bladder (113).

5. The anti-freezing system for the motion envelope zone of a pneumatic flap gate according to claim 1, characterized in that, It also includes a gate seat heating assembly (8), which is disposed on the upper surface of the concrete gate seat (1) and covers or is adjacent to the area where the bottom hinge (4) is located, the area below the main airbag (5) and the collapse support area of ​​the steel gate (3).

6. The anti-freezing system for the motion envelope zone of a pneumatic flap gate according to claim 1, characterized in that, It also includes a drainage component (9), which is located at the lowest point of the working surface of the concrete gate seat (1) and the concrete side pier (2). The drainage component (9) includes a drainage channel and a drainage hole communicating with the drainage channel, and at least one section of the drainage component (9) is provided with a heated drainage section.

7. The anti-freezing system for the motion envelope zone of a pneumatic flap gate according to claim 1, characterized in that, It also includes a limiting component, which includes a limiting strap (61), a limiting strap upper end connector (62), and a limiting strap lower end anchor (63). One end of the limiting strap (61) is connected to the upper gate connecting seat (31) through the limiting strap upper end connector (62), and the other end of the limiting strap (61) is connected to the foundation anchor (12) through the limiting strap lower end anchor (63), which is used to limit the maximum water blocking position of the steel gate (3).

8. A method for preventing freezing in the motion envelope area of ​​a pneumatic flap gate, comprising a pneumatic flap gate motion envelope area antifreeze system according to any one of claims 1-7, characterized in that, Specifically, the following steps are included: Step 1: Collect ambient temperature, working surface temperature of the heated side pier, gate seat temperature, current position of the steel gate, active side water-stopping status, and drainage status. Step 2: Receive the target opening / closing command, and determine the target motion envelope sub-region corresponding to the subsequent rotation of the steel gate based on the current position of the steel gate and the target position; Step 3: When the ambient temperature is lower than the first set value or the temperature of the target motion envelope sub-region is lower than the second set value, the side pier heating zone and gate seat heating assembly corresponding to the target motion envelope sub-region are activated. Step 4: Determine whether the target motion envelope region has reached the preset thawing condition. The preset thawing condition is that the temperature of the target motion envelope region reaches a third set value and remains at a set time, and the drainage component detects the discharge of melt water. Step 5: After the preset thawing conditions are met, the expandable active side water stop is depressurized and retracted. Step six: After confirming that the expandable active side water stop is released in place, drainage is normal, and there is no malfunction that prevents operation, control the main airbag to inflate or deflate, so that the steel gate rotates toward the target position.

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