Bulkhead gate inter-section limiting method

Abstract

The invention relates to the technical field of bulkhead gates, and discloses a bulkhead gate internode limiting method which comprises the following steps: S1, strength accounting and assembly of a concave limiting plate, S2, strength accounting and assembly of a convex limiting plate, S3, assembly of a pressure plate, S4, connection of a data processing terminal, S5, alarm mechanism setting and S6, anti-corrosion treatment. The bending strength and the shearing strength of the concave limiting plate and the convex limiting plate are calculated according to the overall weight of the bulkhead gate, bearing capacity matching of the concave limiting plate and the convex limiting plate is guaranteed, the concave limiting plate and the convex limiting plate are welded to the front surfaces of the upper gate leaf rib plate and the lower gate leaf rib plate respectively in combination with wedge-shaped cut-in matching of the concave limiting plate and the convex limiting plate, and balance of the gate in the locked state is effectively controlled; the problem of dislocation of upper and lower sections of gate leaves is solved, abrasion deformation and inclination of the gate leaves due to dislocation are avoided, potential safety hazards of a gate, a hoist and a portal are eliminated, and safe and stable operation of the gate leaves, a hoisting mechanism and a hydraulic structure is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of flat gate technology, specifically to a method for limiting the movement between sections of a flat gate. Background Technology

[0002] Flat slab gates are core equipment in the water-retaining system of hydropower stations, playing a crucial role in the safe and stable operation of the dam. Based on the actual operational needs of hydropower stations, flat slab steel gates are available in two structural forms: single-section gate leaf and multi-section gate leaf. The multi-section gate leaf structure requires inter-section limiting technology to constrain the relative displacement of the upper and lower gate leaves, maintaining balance in the locked state and ensuring stable opening and closing processes. This is a vital technical aspect for ensuring the normal operation of the gate and related equipment.

[0003] In existing technologies, for single-section gate leaf flat panel gates, basic operational requirements can be met without the need for additional inter-section limiting structures. However, for flat panel gates composed of multiple gate leaf sections, most of them do not have a specially designed and deployed systematic limiting method for inter-section displacement control. They rely solely on the structural rigidity of the gate leaf itself or the natural guidance of the gate leaf stiffeners to maintain the inter-section position. There is no standardized limit structure design, installation process, or strength calculation specification.

[0004] The most critical shortcoming of existing technology is that most flat gates composed of multiple gate leaves do not have a dedicated inter-section limiting method. This makes it impossible to effectively control the balance of the gate in the locked state, which easily leads to misalignment between the upper and lower gate leaves. This misalignment causes continuous wear, deformation, and tilting of the gate leaves, posing a major safety hazard to the gate, hoist, and gantry, and directly affecting the safe and stable operation of the gate leaves, hoisting mechanism, and hydraulic structures. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a method for limiting the inter-segment positioning of a flat gate, which solves the problem of insufficient closing accuracy between upper and lower gates in existing technologies.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for limiting the movement of a flat gate segment, comprising the following steps: S1 Concave Limiting Plate Strength Calculation and Assembly: First, calculate the strength of the concave limiting plate based on the overall weight of the flat gate, and then install the qualified concave limiting plate on the front surface of the left and right stiffening plates of the lower section of the flat gate leaf. S2 Convex Limiting Plate Strength Calculation and Assembly: First, calculate the strength of the convex limiting plate based on the overall weight of the flat gate. Then, using the concave limiting plate already installed in S1 as a reference, install the qualified convex limiting plate on the front surface of the left and right stiffening plates of the upper section of the flat gate leaf. The protruding part of the convex limiting plate should not detach from the recessed part of the concave limiting plate in S1 when the gate sections are completely separated. S3 Pressure Plate Assembly: Multiple sets of independent pressure plates are installed on the inner side of the concave limiting plate in S1, and the independent pressure plates cover each surface of the inner side of the concave limiting plate. S4 Data Processing Terminal Connection: Connect the pressure plate in S3 to the external data processing terminal and pressure sensor. The data processing terminal receives and processes the pressure signal transmitted by the pressure transmission structure. S5 alarm mechanism settings: Set alarm trigger conditions on the data processing terminal in S4. When the data processing terminal detects that the pressure on one side of the concave limit plate exceeds the set threshold, the alarm is triggered. S6 anti-corrosion treatment: Anti-corrosion treatment is applied to the surfaces of concave limiting plates, convex limiting plates, pressure plates, and door leaf structures.

[0007] Preferably, the strength calculation and assembly of the concave limiting plate in S1 includes: calculating the bending strength and shear strength of the concave limiting plate during strength calculation to ensure that the calculated values ​​are not lower than the load requirements corresponding to the overall weight of the flat gate; during assembly, the contact area between the concave limiting plate and the front surface of the lower gate leaf stiffener is first derusted to a rust removal grade of Sa2.5, and then the concave limiting plate is welded and fixed to the front surface of the stiffener by arc welding, with the weld height not less than 1 / 2 of the thickness of the concave limiting plate.

[0008] Preferably, the strength calculation and assembly of the convex limiting plate in S2 includes: when calculating the strength, referring to the strength calculation standard of the concave limiting plate in S1, ensuring that the load-bearing capacity of the convex limiting plate matches that of the concave limiting plate; when assembling, using the concave part of the concave limiting plate in S1 as the alignment reference, after adjusting the position of the convex limiting plate, the convex limiting plate is welded and fixed to the front surface of the upper door leaf stiffener plate by arc welding.

[0009] Preferably, the pressure plate assembly in S3 includes: an independent, single-piece pressure plate made of stainless steel with a thickness of 8-12mm; the contact area between the pressure plate and the inner side of the concave limiting plate in S1 is ground, and the surface roughness after grinding is no greater than Ra3.2μm; then, the pressure plate is welded and fixed to the inner side of the concave limiting plate using argon arc welding; after welding, the weld is subjected to penetration testing to ensure that there are no defects such as pores or cracks; a cable adapted to pressure detection is pre-installed on the side of the pressure plate away from the concave limiting plate, one end of the cable is fixedly connected to the pressure plate, and the other end extends to the outside of the pressure plate and is reserved with an interface for connecting a pressure sensor.

[0010] Preferably, the data processing terminal and pressure sensor in S4 are external devices. After the flat gate is closed, the pressure sensor is connected to the pressure plate and transmits the sensor data from the pressure plate to the data processing terminal for pressure value detection. When the external data processing terminal and pressure sensor are not connected, the cable end is sealed by a sealing head.

[0011] Preferably, the alarm mechanism setting in S5 includes: the pressure threshold for alarm triggering conditions is determined by combining the strength calculation results of the concave limit plate and the convex limit plate in S1 and S2, and the threshold is set to 80% of the allowable pressure of the limit plate; when the alarm is triggered, the data processing terminal first records the current pressure value and the angle position information of the corresponding pressure sensor, then starts the local buzzer alarm, and at the same time transmits the alarm information to the central control system of the hydropower station through the RS485 interface.

[0012] A plate gate segment limiting device includes an upper gate and a lower gate. The front surfaces of the upper gate and the lower gate are fixedly connected with reinforcing ribs, and limiting structures are provided on the front surfaces of the upper gate and the lower gate. The limiting structure includes a concave limiting plate and a convex limiting plate. The back of the concave limiting plate is fixedly connected to the lower gate, and the back of the convex limiting plate is fixedly connected to the upper gate. Multiple pressure plates are fixedly connected to the inner surface of the concave limiting plate. An air passage is opened on the inner wall of the concave limiting plate. A sealing element is fixedly connected to the upper end of the air passage, and a blocking plate is fixedly connected to the lower end of the inner surface of the air passage.

[0013] Preferably, a support plate is slidably connected to the lower part of the inner surface of the concave limiting plate, and a counterweight buffer is fixedly connected to the lower surface of the support plate. The connection between the support plate and the concave limiting plate is sealed. Multiple sets of counterweight buffers are provided, and the multiple sets of counterweight buffers are respectively located at the four corners of the lower surface of the support plate.

[0014] Preferably, the inner surface of the concave limiting plate is provided with a flat-topped pyramidal groove, the lower surface of the convex limiting plate is provided with a rectangular protrusion, the left, right and front surfaces of the convex limiting plate are all set as inclined surfaces, the inner groove of the concave limiting plate has the same shape and size as the convex limiting plate, multiple sets of rectangular grooves are provided on the inner surface of the concave limiting plate, a wire harness is fixedly connected to the back of the pressure plate, the air passage is set as a C-shape, and the upper end of the air passage is connected to the sealing element.

[0015] Preferably, a rectangular groove is provided on the lower surface of the convex limiting plate, the sealing element is an expandable element, the lower part of the air passage is connected to the lower rectangular groove of the convex limiting plate, the size of the blocking plate is the same as the size of the air passage, and a frustum-shaped groove is provided on the inner surface of the blocking plate.

[0016] Working principle: During the closing process of the upper and lower sets of gates, the convex limiting plate will approach the concave limiting plate. Since the left, right, and front three sides of the convex limiting plate are all inclined and wedge-shaped, the reaction force between the inclined surfaces of the two plates will push the convex limiting plate towards the center of the concave limiting plate during contact. Simultaneously, because the back of the convex limiting plate is welded to the upper gate, the gap between the upper and lower sets of gates is small when fully closed. As the convex limiting plate approaches the concave limiting plate, its lower rectangular protrusion will push the support plate downwards. During this downward movement, the support plate will compress the high-pressure gas in the lower rectangular space of the concave limiting plate and push it through the air passage towards the seal. Meanwhile, because the baffle plate has a frustum-shaped... The through-hole and the large inlet and small outlet of the groove obstruct the movement of gas, thus creating damping for the movement of the support plate and the convex limiting plate through the compression of the high-pressure gas. Furthermore, since a counterweight buffer is provided below the support plate, it can buffer the impact force generated when the convex limiting plate moves. That is, the impact vibration generated during the closing of the upper and lower gates is reduced through buffering and movement damping. In addition, the gas moving upward along the air passage will fill the interior of the seal and cause it to expand and extend. The expanded seal will then seal the connection between the upper end of the convex and concave limiting plates, preventing moisture and impurities from the external environment from entering the interior of the concave limiting plate and reducing the risk of corrosion of the internal components of the concave limiting plate.

[0017] This invention provides a method for inter-segment limiting of a flat gate. It has the following beneficial effects: 1. This invention calculates the bending and shear strength of the concave and convex limiting plates based on the overall weight of the flat gate to ensure that their load-bearing capacity is matched. Then, combined with the wedge-shaped engagement of the concave and convex limiting plates, they are welded to the front surface of the upper and lower gate leaf stiffeners respectively. This effectively controls the balance of the gate in the locked state, solves the problem of misalignment between the upper and lower gate leaves, avoids wear, deformation and tilting of the gate leaves due to misalignment, eliminates safety hazards of the gate, hoist and gantry, and ensures the safe and stable operation of the gate leaves, lifting mechanism and hydraulic structure.

[0018] 2. This invention installs multiple pressure plates inside the concave limiting plate, and connects them with an external pressure sensor to transmit the pressure signal to a data processing terminal. The terminal receives and processes the pressure signal in real time and sets alarm thresholds. When the pressure exceeds the limit, a local buzzer alarm is triggered and a remote report is sent. At the same time, the pressure value and sensor angle position information are recorded. When the sensor is not in use, the cable end is sealed with a sealing head to prevent moisture intrusion. This invention achieves real-time monitoring of the door leaf limiting status while ensuring the corrosion resistance of the pressure monitoring component, thus improving the safety and convenience of operation and maintenance.

[0019] 3. This invention provides a sliding support plate on the lower inner side of the concave limiting plate, which, together with the counterweight buffer on the lower surface of the support plate, forms motion damping and impact buffering when the convex limiting plate descends, reducing the impact vibration when the door leaf closes; at the same time, the air passage in the inner wall of the concave limiting plate is used to transmit high-pressure gas to drive the expandable seal to expand when the support plate is under pressure, sealing the gap at the connection between the concave and convex limiting plates, preventing external moisture and impurities from entering, reducing the risk of internal component corrosion, and extending the overall service life of the limiting device. Attached Figure Description

[0020] Figure 1 This is a flowchart of the inter-segment limiting method for this flat gate; Figure 2 This is a schematic diagram of the flat gate of the present invention; Figure 3 This is a schematic diagram of the inner side of the limiting structure of the present invention; Figure 4 This is a schematic diagram of the convex limiting plate of the present invention; Figure 5 This is a schematic diagram of the cross-section of the concave limiting plate of the present invention; Figure 6 for Figure 5 Enlarged diagram of point A in the middle.

[0021] Among them, 1. Upper gate; 2. Limiting structure; 3. Lower gate; 4. Reinforcing rib; 201. Pressure plate; 202. Concave limiting plate; 203. Support plate; 204. Counterweight buffer; 205. Convex limiting plate; 206. Air passage; 207. Sealing element; 208. Baffle plate. Detailed Implementation

[0022] The technical solutions in 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.

[0023] Example: Please see the appendix Figure 1 This invention provides a method for limiting the movement of a flat gate segment, comprising the following steps: S1: Strength Calculation and Assembly of Concave Limiting Plate The purpose of this step is to ensure that the concave limiting plate, which serves as the limiting base, has sufficient structural strength and is accurately installed on the lower gate leaf. First, a strength calculation is performed. The input for this calculation is the "overall weight of the flat gate," which we define as... (Unit: N). Considering safety redundancy and impact, a design safety factor is set. (For example The total design load is then... for: Assuming installation on both the left and right sides Group limit device (usually) Then, the theoretical design load that each set of concave limiting plates needs to withstand is... for: Calculate shear strength and flexural strength: Shear strength calculation: Calculate the stress that the limiting plate resists against shear failure, and the shear stress. The formula for calculating shear stress is: in (Effective shear area) is the critical shear cross-sectional area of ​​the concave limiting plate in the direction of force, determined by its specific geometry (such as the root of the lug). The calculation standard is: in (Allowable shear stress) is the allowable shear stress of a material, usually taken as... ,here (Yield strength) is the yield strength of a material. (Shear safety factor) is the shear safety factor (usually taken as...). ); Flexural strength calculation: Treat the limiting plate (or its key load-bearing components) as a cantilever beam or simply supported beam, and calculate its maximum bending stress. (Calculation of bending stress): in (Maximum bending moment) is determined by the load. The maximum bending moment generated (e.g., for a cantilever structure, , (Lever arm) is the distance from the point of application of the load to the fixed end. (Bending section modulus) is the bending modulus of a plate section subjected to bending. The calculation standard is: in (Allowable bending stress) is the allowable bending stress of a material, usually taken as... , (Bending safety factor) is the bending safety factor (e.g., 1.5).

[0024] Only when and The strength calculation is considered qualified only when all conditions are met.

[0025] After the calculation is approved, assembly will proceed. First, the area to be welded on the front surface of the lower door leaf stiffener plate will be sandblasted or ground to ensure cleanliness. Grade standard. Then, the concave limiting plate is positioned and firmly welded to the stiffening plate using arc welding (e.g., manual arc welding or CO2 gas shielded welding), with a weld height of... Must meet: in (Concave plate thickness) refers to the thickness of the concave limiting plate. S2: Strength Calculation and Assembly of Convex Limiting Plate This step involves installing a matching convex limiting plate on the upper door leaf; The strength calculation section includes the calculation standards (including) The value of and The standard for calculating the concave limiting plate in S1 is completely consistent with the standard for calculating the convex limiting plate, ensuring that their load-bearing capacities are matched. and calculation of bending stress The same conditions must be met: in (Shear area of ​​convex plate) and (The bending modulus of the convex plate) are the effective shear area and the bending section modulus of the convex limiting plate, respectively.

[0026] During assembly, the key is proper positioning. Using the recessed part of the concave limiting plate already fixed in S1 as a reference, lower the upper gate leaf into position and adjust the position of the convex limiting plate to ensure precise fit with the recess. Simultaneously, a crucial constraint must be met: when the gate sections are fully separated (raised to their limit position), the protruding part of the convex limiting plate... (The length of the protrusion) is still the same as the recessed portion of the concave limiting plate. (Recess length) Maintain minimum engagement length (Minimum engagement), that is: in (Overlap length) is the overlap length. (Maximum pitch) is the maximum separation distance between gate sections. After confirming the position, it is also welded and fixed using arc welding; S3 pressure plate assembly: Multiple sets of independent pressure plates are installed on the inner side of the concave limiting plate in S1, and the independent pressure plates cover each surface of the inner side of the concave limiting plate. The independent, single-piece pressure plate is made of stainless steel with a thickness of 8–12 mm. The contact area between the pressure plate and the inner side of the concave limiting plate in S1 is ground to a surface roughness of no more than Ra3.2 μm. Then, the pressure plate is welded and fixed to the inner side of the concave limiting plate using argon arc welding. After welding, the weld is subjected to penetrant testing to ensure that there are no defects such as pores or cracks. A cable adapted for pressure detection is pre-installed on the side of the pressure plate away from the concave limiting plate. One end of the cable is fixedly connected to the pressure plate, and the other end extends to the outside of the pressure plate and has a reserved interface for connecting the pressure sensor. S4 data processing terminal connection: Connect the pressure plate in S3 to the external data processing terminal and the pressure sensor. The data processing terminal receives and processes the pressure signal transmitted by the pressure transmission structure. In S4, the data processing terminal and pressure sensor are external devices. After the flat gate is closed, the pressure sensor is connected to the pressure plate and transmits the sensor data from the pressure plate to the data processing terminal for pressure value detection. When the external data processing terminal and pressure sensor are not connected, the cable end is sealed with a sealing head. S5: Alarm Mechanism Settings: This is the core monitoring and diagnostic step of the method, and its algorithm is implemented in the data processing terminal. Implemented above; 1. Alarm Threshold Setting: The purpose of the alarm is to detect abnormal unilateral stress caused by "misalignment." The pressure threshold for alarm triggering conditions is set accordingly. The pressure threshold is determined based on the strength calculation results in S1 and S2. We first determine the allowable pressure of the limiting plate. (Allowable pressure), which is related to allowable stress. and the pressure contact area (Contact area) related: (Note: Here) This should be the allowable compressive stress of the material, but in engineering simplifications, the allowable flexural stress or yield strength is often referred to. (According to claim 6, threshold...) Set to 80% of the allowable pressure: 2. Real-time monitoring and alarm algorithm: After startup, by time (Time) Continuous Polling Group pressure sensors to acquire Pressure value For each Perform the following logical judgment: IF THEN TriggerAlarm( , ) ELSE ContinueMonitoringContinueMonitoring 3. Alarm action sequence: When TriggerAlarm When the function is triggered, (Data processing terminal) Perform the following operations: Record data: Immediately record the alarm event in local non-volatile memory. The log should contain at least the following: (Current pressure value exceeding the limit); (The sensor number that triggered the alarm); (The sensor) The corresponding "angle position information", (Angle position information) indicates the specific orientation of the sensor in the limiting device, such as "left limiter - upstream surface"); Local alarm: Drive local buzzer The buzzer sounds to alert on-site maintenance personnel; Remote reporting: The alarm frame containing Log information is transmitted via its RS485 interface. The alarm information is sent to the hydropower station's central control system (SCADA).

[0027] Please see the appendix Figure 2 -Appendix Figure 6 A plate gate segment limiting device includes an upper gate 1 and a lower gate 3. The front surfaces of the upper gate 1 and the lower gate 3 are fixedly connected with reinforcing ribs 4, and limiting structures 2 are provided on the front surfaces of the upper gate 1 and the lower gate 3. The limiting structure 2 includes a concave limiting plate 202 and a convex limiting plate 205. The back of the concave limiting plate 202 is fixedly connected to the lower gate 3, and the back of the convex limiting plate 205 is fixedly connected to the upper gate 1. Multiple sets of pressure plates 201 are fixedly connected to the inner surface of the concave limiting plate 202. These pressure plates 201 have the same contact structure as pressure sensor contacts in the prior art. After being connected to the pressure sensor body, they can detect the current pressure state through the pressure sensor. The inner wall of the concave limiting plate 202... An air passage 206 is provided, through which air in the rectangular area below the concave limiting plate 202 can enter the interior of the seal 207. The upper end of the air passage 206 is fixedly connected to the seal 207, which is an inflatable sealing structure, such as an airbag in the prior art. Its material includes ethylene propylene diene monomer (EPDM) rubber and fluororubber (FKM), and is installed according to actual use requirements. A baffle plate 208 is fixedly connected to the lower end of the inner surface of the air passage 206. The inner surface of the concave limiting plate 202 has a flat-topped pyramidal groove. Therefore, when the convex limiting plate 205 approaches the concave limiting plate 202, the inclined surfaces of the two plates press against each other, pushing the upper gate 1 and the lower gate 3 into contact. The lower surface of the convex limiting plate 205 has a rectangular protrusion. The left, right, and front surfaces of the convex limiting plate 205 are all inclined, thus correcting for positional errors on the front, left, and right sides when the upper gate 1 and lower gate 3 are closed. The inner surface of the concave limiting plate 202... The groove shape is the same as the size of the convex limiting plate 205. Multiple rectangular grooves are opened on the inner surface of the concave limiting plate 202 to accommodate the pressure plate 201 located inside. A wire harness is fixedly connected to the back of the pressure plate 201. The pressure plate 201 can be connected to an external pressure sensor and a data processing terminal through the wire harness. After the upper gate 1 and the lower gate 3 are closed, the positional error between them is judged by the pressure data. The air passage 206 is set as a C-shape. The upper end of the air passage 206 is connected to the seal 207.

[0028] A support plate 203 is slidably connected to the lower part of the inner surface of the concave limiting plate 202. A counterweight buffer 204 is fixedly connected to the lower surface of the support plate 203. The connection between the support plate 203 and the concave limiting plate 202 is sealed. Multiple sets of counterweight buffers 204 are provided, and the multiple sets of counterweight buffers 204 are located at the four corners of the lower surface of the support plate 203. A rectangular groove is provided on the lower surface of the convex limiting plate 205. The upper part of the rectangular groove is sealed by the support plate 203, and the inside of the groove is filled with gas. The sealing element 207 is an expandable element, so when the gas enters its interior, the sealing element 207 can expand as a whole and seal the gap between the convex limiting plate 205 and the concave limiting plate 202. The lower part of the air passage 206 is connected to the lower rectangular groove of the convex limiting plate 205. The size of the baffle plate 208 is the same as the size of the air passage 206, so that the air in the lower rectangular groove of the concave limiting plate 202 can only enter the air passage 206 through the baffle plate 208. A frustum-shaped groove is provided on the inner surface of the baffle plate 208, so that the flow rate of gas entering the air passage 206 is restricted.

[0029] 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 method for limiting movement between sections of a flat gate, characterized in that, Includes the following steps: S1 Concave Limiting Plate Strength Calculation and Assembly: First, calculate the strength of the concave limiting plate based on the overall weight of the flat gate, and then install the qualified concave limiting plate on the front surface of the left and right stiffening plates of the lower section of the flat gate leaf. S2 Convex Limiting Plate Strength Calculation and Assembly: First, calculate the strength of the convex limiting plate based on the overall weight of the flat gate. Then, using the concave limiting plate already installed in S1 as a reference, install the qualified convex limiting plate on the front surface of the left and right stiffening plates of the upper section of the flat gate leaf. The protruding part of the convex limiting plate should not detach from the recessed part of the concave limiting plate in S1 when the gate sections are completely separated. S3 Pressure Plate Assembly: Multiple sets of independent pressure plates are installed on the inner side of the concave limiting plate in S1, and the independent pressure plates cover each surface of the inner side of the concave limiting plate. S4 Data Processing Terminal Connection: Connect the pressure plate in S3 to the external data processing terminal and pressure sensor. The data processing terminal receives and processes the pressure signal transmitted by the pressure transmission structure. S5 alarm mechanism settings: Set alarm trigger conditions on the data processing terminal in S4. When the data processing terminal detects that the pressure on one side of the concave limit plate exceeds the set threshold, the alarm is triggered. S6 anti-corrosion treatment: Anti-corrosion treatment is applied to the surfaces of concave limiting plates, convex limiting plates, pressure plates, and door leaf structures.

2. The method for limiting the movement between sections of a flat gate according to claim 1, characterized in that, The strength calculation and assembly of the concave limiting plate in S1 includes: calculating the bending strength and shear strength of the concave limiting plate during strength calculation to ensure that the calculated values ​​are not lower than the load requirements corresponding to the overall weight of the flat gate; during assembly, the contact area between the concave limiting plate and the front surface of the lower gate leaf stiffener is first derusted to a rust removal grade of Sa2.5, and then the concave limiting plate is welded and fixed to the front surface of the stiffener by arc welding, with the weld height not less than 1 / 2 of the thickness of the concave limiting plate.

3. The method for limiting the movement between sections of a flat gate according to claim 1, characterized in that, The strength calculation and assembly of the convex limiting plate in S2 includes: when calculating the strength, refer to the strength calculation standard of the concave limiting plate in S1 to ensure that the load-bearing capacity of the convex limiting plate matches that of the concave limiting plate; when assembling, use the concave part of the concave limiting plate in S1 as the alignment reference, adjust the position of the convex limiting plate, and then use arc welding to weld and fix the convex limiting plate to the front surface of the upper door leaf stiffener plate.

4. The method for limiting the movement between sections of a flat gate according to claim 1, characterized in that, The pressure plate assembly in S3 includes: an independent, single-piece pressure plate made of stainless steel with a thickness of 8-12mm; the contact area between the pressure plate and the inner side of the concave limiting plate in S1 is ground to a surface roughness of no more than Ra3.2μm; the pressure plate is then welded and fixed to the inner side of the concave limiting plate using argon arc welding; after welding, the weld is subjected to penetrant testing to ensure that there are no defects such as pores or cracks; a cable adapted to pressure detection is pre-installed on the side of the pressure plate away from the concave limiting plate, one end of the cable is fixedly connected to the pressure plate, and the other end extends to the outside of the pressure plate and has a reserved interface for connecting the pressure sensor.

5. The method for limiting the movement between sections of a flat gate according to claim 1, characterized in that, In S4, the data processing terminal and pressure sensor are external devices. After the flat gate is closed, the pressure sensor is connected to the pressure plate and transmits the sensor data from the pressure plate to the data processing terminal for pressure value detection. When the external data processing terminal and pressure sensor are not connected, the cable end is sealed with a sealing head.

6. The method for limiting the movement between sections of a flat gate according to claim 1, characterized in that, The alarm mechanism settings in S5 include: the pressure threshold for alarm triggering conditions is determined by combining the strength calculation results of the concave and convex limit plates in S1 and S2, and the threshold is set to 80% of the allowable pressure of the limit plate; when the alarm is triggered, the data processing terminal first records the current pressure value and the angle position information of the corresponding pressure sensor, then starts the local buzzer alarm, and at the same time transmits the alarm information to the central control system of the hydropower station through the RS485 interface.

7. A limiting device applied to the inter-segment limiting method of a flat gate according to any one of claims 1 to 6, characterized in that, It includes an upper gate (1) and a lower gate (3). The front surfaces of the upper gate (1) and the lower gate (3) are fixedly connected with reinforcing ribs (4). Limiting structures (2) are provided on the front surfaces of the upper gate (1) and the lower gate (3). The limiting structure (2) includes a concave limiting plate (202) and a convex limiting plate (205). The back of the concave limiting plate (202) is fixedly connected to the lower gate (3), and the back of the convex limiting plate (205) is fixedly connected to the upper gate (1). Multiple pressure plates (201) are fixedly connected to the inner surface of the concave limiting plate (202). An air passage (206) is opened on the inner wall of the concave limiting plate (202). A sealing element (207) is fixedly connected to the upper end of the air passage (206), and a baffle plate (208) is fixedly connected to the lower end of the inner surface of the air passage (206).

8. The inter-segment limiting device for a flat gate according to claim 7, characterized in that, A support plate (203) is slidably connected to the lower part of the inner surface of the concave limiting plate (202). A counterweight buffer (204) is fixedly connected to the lower surface of the support plate (203). The connection between the support plate (203) and the concave limiting plate (202) is sealed. Multiple sets of counterweight buffers (204) are provided, and the multiple sets of counterweight buffers (204) are located at the four corners of the lower surface of the support plate (203).

9. A plate gate inter-segment limiting device according to claim 7, characterized in that, The concave limiting plate (202) has a flat-topped pyramidal groove on its inner surface. The convex limiting plate (205) has a rectangular protrusion on its lower surface. The left, right and front surfaces of the convex limiting plate (205) are all set as inclined surfaces. The shape of the groove on the inner side of the concave limiting plate (202) is the same as the size of the convex limiting plate (205). The inner surface of the concave limiting plate (202) has multiple sets of rectangular grooves. The back of the pressure plate (201) is fixedly connected to a wire harness. The air passage (206) is set as a C-shape. The upper end of the air passage (206) is connected to the sealing element (207).

10. A plate gate inter-segment limiting device according to claim 9, characterized in that, The lower surface of the convex limiting plate (205) is provided with a rectangular groove. The sealing element (207) is an expandable element. The lower part of the air passage (206) is connected to the lower rectangular groove of the convex limiting plate (205). The size of the baffle plate (208) is the same as the size of the air passage (206). The inner surface of the baffle plate (208) is provided with a frustum-shaped groove.

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