A water conservancy gate stroke control device

Abstract

The application discloses a water conservancy gate stroke control device and belongs to the field of water conservancy projects. The device comprises a base, fixed rods are fixedly connected to the two sides of the inside of the base, and moving blocks are slidingly connected to the outer walls of the two fixed rods. In the scheme, the device is provided with three protections of electrical power-off, spring buffer locking and threaded transmission clutch to avoid the problem of motor locked-rotor overheating and burning. When the moving blocks reach the limit stroke, the power-off wedge touches the rotating wheel to drive the swing arm to act, and the power-off switch directly cuts off the power supply of the motor. When the electrical components cannot be powered off due to failure, the second spring buffer slows down, the ratchet bar and the pawl locking keep the power-off triggering state, the reversing switch mechanically triggers the motor to reverse, the active return eliminates the locked-rotor, and the sliding plate extrudes the clamping block to separate from the clamping groove. The threaded sleeve and the moving block are unlocked and idled, the power transmission is disconnected, the motor is idled without load, and the condition that the motor is overheated and burned due to long-time locked-rotor is avoided.

Description

Technical Field

[0001] The invention relates to the field of water conservancy engineering, and more specifically, to a water conservancy gate stroke control device. Background Technology

[0002] In water conservancy projects, gates are facilities for regulating water levels and controlling flow. The reliable control of their opening and closing strokes directly affects the operational safety and service life of water conservancy facilities. Currently, water conservancy gates generally adopt a structure with motor-driven threaded rod transmission. The motor drives the threaded rod to rotate, which in turn drives the moving block and gate plate to rise and fall along the guide structure, realizing the opening and closing of the gate. Stroke control is mostly based on electrical limit switches. When the gate plate reaches its limit position, the limit switch is triggered, and the electrical control system cuts off the power supply to the motor, completing the shutdown or reversing control.

[0003] However, existing technologies suffer from several drawbacks. First, the protection logic is simplistic, leading to a high risk of motor stall and burnout. Current travel control relies heavily on electrical limit switches and the control system. Limit switches are prone to contact aging, loose wiring, and mechanical jamming during long-term operation. Furthermore, if the control system malfunctions or sensor signals are interrupted, the gate cannot be properly powered off when it reaches its limit position. The motor will continue to output torque, causing the gate to rigidly lock at the end of its travel. Prolonged stalling can lead to overheating and burnout of the windings. Additionally, components such as the threaded rod and transmission pair can deform and be damaged due to rigid impact. This results in high equipment maintenance costs and significant safety hazards. Second, the lack of mechanical buffering at the end of the travel leads to significant impact damage, which is a problem for most existing gates. Without a flexible buffer structure at the end of the stroke, after the electrical limit fails, the gate and transmission mechanism directly impact the end limit structure at the running speed. The rigid impact under high inertia and high head load will cause problems such as thread deformation, bearing damage, and gate deformation, which will significantly shorten the service life of the equipment. Thirdly, the return function relies on electrical control and has weak fault self-healing ability. The automatic return of existing gates is mostly implemented by programming electrical control units such as PLC and time relay. When the control system fails, the power supply is abnormal, or the signal link is interrupted, the gate will stop at the limit position and cannot return automatically. This will not only affect the efficiency of water conservancy scheduling, but also aggravate the equipment damage due to the continuous power supply and stall of the motor. It does not have the mechanical self-healing ability to break away from electrical control. Summary of the Invention

[0004] The purpose of this invention is to provide a hydraulic gate stroke control device to solve the problems mentioned in the background art.

[0005] To solve the above problems, the invention adopts the following technical solution: a hydraulic gate stroke control device, comprising a base, with fixed rods fixedly connected to both sides inside the base, and movable blocks slidably connected to the outer walls of the two fixed rods; a first threaded rod rotatably connected to both sides inside the base; a threaded sleeve rotatably connected to the inside of each movable block, the threaded sleeve being threadedly connected to the first threaded rod; a baffle fixedly connected between the two movable blocks, the baffle being slidably connected to the base; a slot being formed on the outer wall of the threaded sleeve; a locking block slidably connected to the inside of each movable block, one end of the locking block being engaged in the slot; and motors fixedly connected to both sides above the base, the output end of the motors being fixedly connected to the upper end of the first threaded rods.

[0006] As a further improvement of the present invention, a protrusion is fixedly connected to the middle of one side of the card block, and a first spring for resetting is installed above the card block.

[0007] As a further improvement of the present invention, a sliding plate is slidably connected inside the moving block, both ends of the sliding plate are located outside the moving block, a V-shaped groove is formed in the middle of the sliding plate, and the protrusion is slidably connected inside the V-shaped groove.

[0008] As a further improvement of the present invention, a power-off wedge and a ratchet are fixedly connected to one side of the moving block, and a second spring is sleeved on the outside of the fixing rod, the second spring being located between the moving block and the base below.

[0009] As a further improvement of the present invention, a second threaded rod is rotatably connected to the lower sides of both sides of the base. A mounting block is threadedly connected to the outer wall of the second threaded rod. A pawl is rotatably connected to one side of the mounting block. The pawl engages with a ratchet rack. A knob is fixedly connected to one end of the second threaded rod located outside the base.

[0010] As a further improvement of the present invention, mounting bases are fixedly connected to the lower sides of both sides of the base, and a reversing switch is installed on the upper part of the mounting bases.

[0011] As a further improvement of the present invention, a power-off switch is fixedly connected to the middle of both sides of the base, and a swing arm is rotatably connected to some of the power-off switches. A rotating wheel is rotatably connected to the end of the swing arm, and the rotating wheel is located below the power-off wedge.

[0012] As a further improvement of the present invention, both sides of the interior of the base are fixedly connected to limit plates, and the baffle and the limit plates are slidably connected.

[0013] As a further improvement of the present invention, water-blocking cloths are installed on both sides of the baffle, and the water-blocking cloths are located inside the limiting plate.

[0014] As a further improvement of the present invention, a hydraulic cavity is pre-embedded at the bottom of the base, the fixing rod is fixedly installed at the upper end of the hydraulic cavity, a pressure tapping pipe is fixedly connected to the bottom side of the hydraulic cavity, the pressure tapping pipe extends to the bottom of the water-facing side of the base, a mud and sand prevention net is fixedly installed at the opening of the pressure tapping pipe, a perforated partition is fixedly installed in the inner cavity of the hydraulic cavity and it is divided into an upper hydraulic cavity and a lower pressure tapping cavity, a driving piston and an isolation piston are slidably installed in the upper hydraulic cavity, hydraulic oil is filled between the driving piston and the isolation piston, a piston rod is provided at the upper end of the hydraulic cavity and sleeved on the fixing rod, multiple piston rods are fixedly installed between the driving piston and the pre-pressure push ring, and the second spring is fixedly installed at the upper end of the pre-pressure push ring.

[0015] Compared to existing technologies, the advantages of this invention are: 1. In this solution, the device is equipped with triple protection: electrical power-off, spring buffer locking, and threaded drive clutch, to prevent the motor from stalling and overheating. When the moving block reaches its limit stroke, the power-off wedge contacts the rotating wheel, causing the swing arm to move, and the power-off switch directly cuts off the power supply to the motor. If the electrical components fail and power cannot be cut off, the second spring buffers the deceleration, while the ratchet rack and pawl lock to maintain the power-off trigger state. The reversing switch mechanically triggers the motor to reverse, actively returning to eliminate stalling. If all the above mechanisms fail, the sliding plate squeezes the pawl out of the slot, the threaded sleeve and moving block are unlocked and rotate freely, the power transmission is disconnected, and the motor rotates without load, avoiding the situation where the motor overheats and burns out due to prolonged stalling.

[0016] 2. In this solution, the reversing switch is directly triggered by the mechanical displacement of the moving block, without relying on PLC, time relays, or other electrical control components for calculation, nor requiring a signal transmission link. In the event of electrical faults such as control system crashes, sensor malfunctions, or line breaks, the motor power supply phase sequence can still be switched to force the gate to return, preventing the motor from continuously stalling and the gate structure from being damaged by long-term pressure.

[0017] 3. In this design, after the moving block compresses the second spring into position, the ratchet and the pawl form a one-way engagement, which counteracts the rebound force of the second spring, keeping it in a compressed state. This prevents the rebound from causing the power-off switch and reversing switch to malfunction, ensuring the stable operation of the end protection logic. To unlock, simply turn the knob to move the mounting block and pawl laterally via the second threaded rod, disengaging them from the ratchet groove in a direction parallel to the tooth surface. This eliminates the need to overcome the spring load and results in low operating torque.

[0018] 4. In this solution, a hydraulic cavity is pre-embedded at the bottom of the base. The pressure tapping pipe introduces real water pressure from the bottom of the gate to drive the isolation piston and the drive piston upwards, achieving dynamic adjustment of the preload of the second spring. When the gate reaches its bottom limit stroke, the water pressure increases with water depth, increasing the upward movement of the drive piston and consequently increasing the preload of the second spring. The upward force of the spring is transmitted to the ratchet rack through the moving block, causing the meshing surface of the ratchet rack and the pawl to bear continuous positive pressure. The higher the water pressure, the greater the locking force. This mechanism converts external water load into internal locking force, making the original patented mechanical locking mechanism more reliable under harsh conditions of high water pressure and strong vibration. It completely eliminates the hidden danger of ratchet "chattering and disengagement," achieving a positive feedback adaptive protection effect between water pressure and protection. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the first three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the second three-dimensional structure of the present invention; Figure 3 for Figure 2 Enlarged structural diagram of region A in the middle; Figure 4 This is a partial structural schematic diagram of the present invention; Figure 5 for Figure 4 A magnified structural diagram of region B in the middle; Figure 6 This is a schematic diagram of the internal structure of the movable block in this invention; Figure 7 This is a schematic diagram showing the positional relationship between the card block and the protrusion in this invention; Figure 8 This is a schematic diagram showing the connection relationship between the second threaded rod, the base, and the chuck in this invention; Figure 9 This is a schematic diagram showing the positional relationship between the water-blocking cloth and the base in this invention; Figure 10 This is a schematic diagram of the hydraulic cavity portion in this invention.

[0020] Explanation of the labels in the diagram: 1. Base; 11. Limiting plate; 12. Baffle; 13. First threaded rod; 14. Moving block; 15. Threaded sleeve; 16. Slot; 17. Locking block; 18. Protrusion; 19. First spring; 2. Sliding plate; 21. V-groove; 22. Power-off wedge; 23. Ratchet; 24. Second threaded rod; 25. Mounting block; 26. Claw; 27. Knob; 28. Mounting seat; 29. ​​Reversing switch; 3. Power-off switch; 31. Swing arm; 32. Rotary wheel; 33. Fixed rod; 34. Water-blocking cloth; 35. Second spring; 36. Motor; 4. Hydraulic cavity; 41. Pressure tapping pipe; 42. Anti-sand net; 43. Perforated partition; 44. Isolation piston; 45. Drive piston; 46. Piston rod; 47. Pre-compression push ring. Detailed Implementation

[0021] The technical solution of the invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without creative effort are within the scope of protection of the invention.

[0022] In the description of the invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of the invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the invention according to the specific circumstances.

[0024] Example 1: Please refer to Figures 1-9A hydraulic gate stroke control device includes a base 1. Fixed rods 33 are fixedly connected to both sides of the interior of the base 1. Moving blocks 14 are slidably connected to the outer walls of both fixed rods 33. First threaded rods 13 are rotatably connected to both sides of the interior of the base 1. Threaded sleeves 15 are rotatably connected to the interior of each moving block 14, and the threaded sleeves 15 are threadedly connected to the first threaded rods 13. A baffle 12 is fixedly connected between the two moving blocks 14, and the baffle 12 is slidably connected to the base 1. A groove 16 is formed on the outer wall of the threaded sleeve 15, allowing the moving blocks 14 to slide... A locking block 17 is connected, with one end of the locking block 17 locked inside the locking slot 16. Motors 36 are fixedly connected to both sides above the base 1. The output end of the motor 36 is fixedly connected to the upper end of the first threaded rod 13. A protrusion 18 is fixedly connected to the middle of one side of the locking block 17. A first spring 19 for resetting is installed above the locking block 17. A sliding plate 2 is slidably connected inside the moving block 14. Both ends of the sliding plate 2 are located outside the moving block 14. A V-groove 21 is opened in the middle of the sliding plate 2. The protrusion 18 is slidably connected inside the V-groove 21.

[0025] In this embodiment, under normal opening and closing conditions, the locking block 17 is engaged in the slot 16 of the threaded sleeve 15 under the thrust of the first spring 19, forming a circumferential lock between the threaded sleeve 15 and the moving block 14. When the motor 36 drives the first threaded rod 13 to rotate, the threaded sleeve 15 drives the moving block 14 to move smoothly up and down along the fixed rod 33. When the gate reaches its limit position and the end of the sliding plate 2 touches the limiting structure of the base 1, the sliding plate 2 slides relative to the moving block 14. The inclined surface of its internal V-groove 21 presses against the protrusion 18, causing the locking block 17 to compress the first spring 19 and radially exit the slot 16, instantly releasing the circumferential constraint between the threaded sleeve 15 and the moving block 14. The threaded sleeve 15 rotates freely with the first threaded rod 13, and the moving block 14 and the baffle 12 stop feeding. This mechanism relies entirely on the mechanical structure to trigger the limit clutch, effectively preventing the motor 36 from stalling and burning out, and the threaded pair from seizing.

[0026] The locking block 17 is equipped with a first spring 19 as a reset component. Under normal working conditions, the spring continuously provides locking thrust to ensure stable transmission connection between the threaded sleeve 15 and the moving block 14, and it is not easy to accidentally disengage due to vibration or water impact load. When the limit clutch is triggered, the motor 36 switches to reverse operation, and the threaded sleeve 15 rotates with the first threaded rod 13 under no-load. After the locking slot 16 and the locking block 17 are aligned, the first spring 19 can push the locking block 17 to automatically lock into the locking slot 16, completing the automatic reset of the transmission lock without manual unlocking.

[0027] Example 2: Please refer to Figures 1-9A hydraulic gate travel control device includes a power-off wedge 22 and a ratchet rack 23 fixedly connected to one side of a moving block 14. A second spring 35 is sleeved on the outside of a fixed rod 33, located between the moving block 14 and the lower part of a base 1. Second threaded rods 24 are rotatably connected to the lower sides of both sides of the base 1. Mounting blocks 25 are threadedly connected to the outer walls of the second threaded rods 24. A pawl 26 is rotatably connected to one side of the mounting block 25, engaging with the ratchet rack 23. A knob is fixedly connected to one end of the second threaded rod 24 located outside the base 1. 27. Mounting bases 28 are fixedly connected to the lower sides of both sides of the base 1. A reversing switch 29 is installed above the mounting bases 28. A power-off switch 3 is fixedly connected to the middle of both sides of the base 1. A swing arm 31 is rotatably connected to some of the power-off switch 3. A rotating wheel 32 is rotatably connected to the end of the swing arm 31. The rotating wheel 32 is located below the power-off wedge block 22. Limiting plates 11 are fixedly connected to both sides inside the base 1. A baffle 12 is slidably connected to the limiting plate 11. A water-blocking cloth 34 is installed on both sides of the baffle 12. The water-blocking cloth 34 is located inside the limiting plate 11.

[0028] In this embodiment, when the moving block 14 reaches its limit travel range, the power-off wedge 22 fixed to its side first contacts the wheel 32 at the end of the swing arm 31 with its inclined structure. Through rolling contact, the swing arm 31 is pushed to swing, avoiding component wear and switch impact caused by rigid collision. This triggers the power-off switch 3, which first cuts off the power supply circuit of the two motors 36. The remaining travel is completed by relying on system inertia, realizing the first stage of electrical pre-deceleration. If the electrical control fails or the power-off signal does not respond normally, the moving block 14 continues to feed, which will compress the second spring 35 sleeved outside the fixed rod 33. The spring reaction force increases linearly with the amount of compression, continuously absorbing the large inertial kinetic energy of the gate and transmission mechanism, converting the high-speed downward motion into a uniform deceleration process until the kinetic energy is completely absorbed.

[0029] When the moving block 14 descends and compresses the second spring 35 to the trigger position, the elastic potential energy stored in the second spring 35, together with the reverse load of the gate, will generate a force that pushes the moving block 14 upward to reset. At this time, the ratchet 23 fixed to the side of the moving block 14 and the pawl 26 hinged to the mounting block 25 form a one-way locking engagement. Because the tooth surface of the ratchet 23 is parallel to the horizontal plane, and the bearing surface of the pawl 26 is in contact with the tooth surface, a reverse bearing can be formed in the vertical direction to counteract the rebound force and lock the second spring 35 in the compressed state. This structure can avoid the contact chattering problem caused by the rebound of the second spring 35, which causes the power-off switch 3 and the reversing switch 29 to repeatedly turn on and off. It ensures the stability of the triggering state of the protection logic such as limit power-off and forced reversing, and ensures the reliable execution of the reversing command. Moreover, the pure mechanical locking does not require continuous power supply or additional external force to maintain it. It can still maintain the protective state under extreme conditions such as power failure and control system paralysis, and improve the operational reliability of the entire limit mechanism.

[0030] By turning the knob 27 on the outside of the base 1, the second threaded rod 24 can be driven to rotate synchronously. The rotational motion is converted into the horizontal displacement of the mounting block 25 through thread transmission, which in turn drives the pawl 26 hinged to the mounting block 25 to move horizontally synchronously. Relying on the structural characteristic that the tooth surface of the ratchet 23 is parallel to the horizontal plane, after the pawl 26 moves out of the tooth groove along the parallel direction of the tooth surface with the mounting block 25, the locking constraint with the ratchet 23 can be released. This unlocking direction is perpendicular to the locking bearing direction, and there is no need to overcome the spring force and gate load. The operating torque is small and the operation is easy. At the same time, the second threaded rod 24 has the thread self-locking characteristic. After adjustment, the position of the pawl 26 can be maintained by itself and will not move accidentally due to vibration. After unlocking, the second spring 35 can push the moving block 14 to reset by its own elasticity. There is no need for prying, lifting or other complicated operations, and there is no need to enter the gate chamber for operation. It is suitable for the narrow and humid on-site working environment of water conservancy gate stations and improves the operational efficiency of equipment debugging, fault diagnosis and daily maintenance.

[0031] A reversing switch 29, fixed to the side of the base 1 by mounting bracket 28, is arranged corresponding to the gate's limit stroke. When the moving block 14 reaches its end position, mechanical displacement triggers the reversing switch 29, switching the power supply phase sequence of the motor 36 and driving the gate to automatically perform the return stroke. This reversing triggering logic is driven by mechanical displacement and does not rely on PLC, time relays, or other electrical control components for calculation, nor does it require a signal transmission link. It can be effective in multiple electrical fault scenarios such as main control system crashes, sensor malfunctions, and control line breaks, avoiding serious accidents such as continuous stalling and burnout of the motor 36 and long-term pressure damage to the gate structure. At the same time, this mechanism forms a double redundancy protection with the clutch mechanism of the threaded sleeve 15. Even if the reversing action fails, the threaded sleeve 15 can still dissipate the motor power by idling, further strengthening the equipment's safety defense and improving the device's fault self-healing capability and adaptability to extreme working conditions.

[0032] The limiting plate 11, symmetrically fixed on the inner side of the base 1, forms a surface contact sliding fit with the baffle 12. It can withstand the lateral load of water flow acting on the baffle 12, and constrain the lateral movement and sway of the baffle 12 during the lifting and lowering process. Together with the main guide pair formed by the fixed rod 33 and the moving block 14, it forms a "main guiding direction + lateral limiting" guiding system, ensuring the straightness and smoothness of the gate operation and reducing the wear and tear of the guide surface. At the same time, the water-blocking cloth 34 installed on both sides of the baffle 12 is stored in the inner groove of the limiting plate 11. It can adaptively fold and extend with the lifting and lowering of the baffle 12. Without interfering with the lifting and lowering movement, it seals the fitting gap between the baffle 12 and the limiting plate 11, preventing lateral leakage of water flow.

[0033] Example 3: Based on the above examples, please refer to... Figure 10A hydraulic cavity 4 is pre-embedded in the bottom of the base 1. The hydraulic cavity 4 is a cylindrical or rectangular sealed cavity made of stainless steel and is welded or bolted to the inner bottom of the base 1. The lower end of the fixing rod 33 is fixed to the upper end face of the hydraulic cavity 4 by a flange or thread to ensure the verticality and stability of the fixing rod 33.

[0034] A pressure tapping pipe 41 is fixedly connected to the bottom side of the hydraulic cavity 4. The pressure tapping pipe 41 is a seamless stainless steel pipe with an inner diameter of 8-12 mm. The pressure tapping pipe 41 is laid along the internal direction of the base 1, extending to the lower end side wall of the water-facing side of the base 1. The opening of the pressure tapping pipe 41 is located at the bottom of the water-facing side wall of the base 1, and a silt-prevention mesh 42 is fixedly installed at the opening. The silt-prevention mesh 42 is a stainless steel woven mesh with a mesh diameter of 0.5-1.0 mm, used to prevent large particles of silt and debris in the river water from entering the pressure tapping pipe 41. The laying path of the pressure tapping pipe 41 should avoid right-angle bends and use rounded transitions to reduce pressure loss and the risk of silt deposition.

[0035] A perforated baffle 43 is fixedly installed inside the hydraulic cavity 4. The perforated baffle 43 is horizontally arranged and welded or threaded to the inner wall of the middle part of the hydraulic cavity 4. Multiple through holes with a diameter of 3-5 mm are evenly distributed on the perforated baffle 43. These holes are used to evenly transfer the water pressure from the lower pressure chamber to the bottom surface of the isolation piston 44, preventing the isolation piston 44 from tilting due to single-point water ingress. The perforated baffle 43 divides the inner cavity of the hydraulic cavity 4 into an upper hydraulic cavity and a lower pressure chamber. The lower pressure chamber is connected to the pressure tapping pipe 41. A vent valve, either a ball valve or a needle valve, can be connected to the bottom of the lower pressure chamber as needed. This vent valve is installed on the outside of the base 1 in an easily accessible position and is used to drain accumulated water and sediment from the lower pressure chamber during routine maintenance.

[0036] An isolation piston 44 and a drive piston 45 are slidably mounted within the upper hydraulic chamber. The isolation piston 44 is located below the drive piston 45, and both form a sliding seal with the inner wall of the hydraulic chamber 4. Both the isolation piston 44 and the drive piston 45 are made of corrosion-resistant stainless steel or copper alloy, and their outer peripheral walls are fitted with Y-type sealing rings or Glyd rings to ensure a tight seal with the inner wall of the hydraulic chamber 4. The cavity between the isolation piston 44 and the drive piston 45 is filled with hydraulic oil, which is L-HM46 anti-wear hydraulic oil or cryogenic hydraulic oil. The space between the bottom surface of the isolation piston 44 and the porous partition 43 is the lower pressure tapping chamber, where the introduced river water directly acts on the bottom surface of the isolation piston 44. Above the isolation piston 44 is hydraulic oil, which transmits the water pressure to the bottom surface of the drive piston 45. The core function of the isolation piston 44 is to completely isolate the river water containing mud and sand from the pure hydraulic oil. Even if the fine mud and sand that the anti-mud and sand net 42 fails to completely intercept are deposited only in the lower pressure chamber below the porous partition 43, and will not enter the upper hydraulic chamber to contaminate the hydraulic oil, thus ensuring the smooth operation of the drive piston 45 for a long time.

[0037] The upper end of the hydraulic chamber 4 has a guide hole, and at least two piston rods 46 are slidably installed in the guide hole, preferably four piston rods 46 arranged symmetrically to ensure uniform thrust. The lower end of the piston rod 46 is fixedly connected to the upper end face of the drive piston 45 by thread or welding, and a preload push ring 47 is fixedly connected to the upper end of the piston rod 46. The preload push ring 47 is an annular plate structure, sleeved on the outside of the fixed rod 33, with a gap of 2-3 mm between its inner diameter and the outer diameter of the fixed rod 33 to avoid friction. The lower end of the second spring 35 is fixedly connected to or abuts against the upper end face of the preload push ring 47, and the upper end of the second spring 35 abuts against the lower end face of the moving block 14. When the drive piston 45 moves upward, the piston rod 46 pushes the preload push ring 47 to move upward synchronously, and the preload push ring 47 compresses the second spring 35, realizing dynamic adjustment of the spring preload. The upper end face of the preload push ring 47 may also be provided with an annular groove to accommodate the lower end ring of the second spring 35 and prevent the spring from sliding radially.

[0038] In this embodiment, when the gate is operating normally, the moving block 14 is in the middle of its stroke, and the water pressure at the opening of the pressure tapping pipe 41 at the lower end of the water-facing surface of the base 1 is low (the gate has not yet approached the bottom). The water pressure in the lower pressure tapping chamber is insufficient to push the isolation piston 44 upward significantly. The driving piston 45 is at the bottom of the hydraulic chamber 4, the pre-pressure push ring 47 is in a low position, and the second spring 35 is in its natural length or slightly compressed state, without generating additional running resistance. When the gate continues to descend to the bottom limit stroke under fault conditions, the water depth at the opening of the pressure tapping pipe 41 increases, the water pressure rises, and the high-pressure water enters the lower pressure tapping chamber through the pressure tapping pipe 41. It is then evenly applied to the bottom surface of the isolation piston 44 by the porous baffle 43, pushing the isolation piston 44 upward. The isolation piston 44 pushes the driving piston 45 upward synchronously through the hydraulic oil. The driving piston 45 pushes the pre-pressure push ring 47 upward through the piston rod 46, and the pre-pressure push ring 47 compresses the second spring 35. The higher the water pressure, the greater the upward distance of the drive piston 45, the greater the pre-compression of the second spring 35, and the upward elastic force of the spring is transmitted to the ratchet rack 23 through the moving block 14, so that the meshing surface of the ratchet rack 23 and the pawl 26 bears a greater positive pressure, making the locking more reliable, completely eliminating the risk of "chattering and disengagement" caused by vibration in deep water areas, and having a better effect on buffering and deceleration.

[0039] When the gate malfunction is resolved and the motor 36 reverses to drive the moving block 14 upwards, the moving block 14 moves away from its bottom limit position. The water pressure at the opening of the pressure tapping pipe 41 decreases accordingly. The isolation piston 44 and the drive piston 45, under their own weight and the rebound force of the second spring 35, fall back to the bottom of the hydraulic chamber 4. The pre-pressure push ring 47 moves downwards, the second spring 35 returns to its natural length, and the device enters standby mode. If maintenance or drainage of the water in the lower pressure tapping chamber is required, simply open the vent valve 49 to drain the water. Simultaneously, debris trapped by the anti-sand net 42 can be cleaned with tools at the opening of the pressure tapping pipe 41.

[0040] Overall working principle: Two motors 36 rotate synchronously in the same direction, driving the first threaded rods 13 on both sides to rotate respectively. At this time, the locking block 17, under the elastic force of the first spring 19, engages in the locking groove 16 on the outer wall of the threaded sleeve 15, so that the threaded sleeve 15 and the moving block 14 form a circumferential lock. The first threaded rod 13 drives the threaded sleeve 15 and the moving block 14 to move linearly up and down along the fixed rod 33 through threaded engagement. The moving blocks 14 on both sides synchronously drive the baffle 12 to slide along the limiting plate 11, realizing the opening and closing of the gate. The water-blocking cloth 34 on both sides of the baffle 12 extends and retracts synchronously with the baffle, continuously sealing the side gaps and maintaining the water-blocking sealing effect.

[0041] When the moving block 14 descends to the preset limit travel range, the power-off wedge 22 fixed to its side contacts the rotating wheel 32 at the end of the swing arm 31, pushing the swing arm 31 to swing around the axis, thereby triggering the power-off switch 3 and cutting off the power supply circuit of the two motors 36. Under normal operating conditions, the motors 36 stop running, and the moving block 14 and the baffle 12 rely on inertia to complete the remaining travel and then come to a stop, realizing electrical limit control.

[0042] If the electrical control fails or the power outage signal does not respond normally, the motor 36 continues to drive the moving block 14 downwards. The moving block 14 begins to compress the second spring 35 sleeved outside the fixed rod 33. Through the deformation of the spring, it continuously absorbs the kinetic energy of the motion and applies reverse resistance to the moving block 14 to achieve mechanical deceleration. At the same time, as the moving block 14 descends to the bottom limit position, the opening of the pressure tapping pipe 41 at the lower end of the water-facing side of the base 1 is submerged in water. The upstream water pressure enters the lower pressure tapping chamber of the hydraulic cavity 4 through the pressure tapping pipe 41 and is evenly applied to the bottom surface of the isolation piston 44 through the porous baffle 43. The water pressure pushes the isolation piston 44 upwards, and the isolation piston 44 pushes the drive piston 45 upwards through the hydraulic oil. The drive piston 45 pushes the pre-compression push ring 47 upwards through the piston rod 46. The pre-compression push ring 47 applies additional pre-compression force to the second spring 35. The higher the water pressure, the greater the pre-compression of the second spring 35. The upward elastic force of the spring is transmitted to the ratchet rack 23 through the moving block 14, so that the meshing surface of the ratchet rack 23 and the pawl 26 bears continuous positive pressure. The higher the water pressure, the greater the locking force, which effectively prevents "chattering and disengagement" caused by vibration in deep water areas, and the buffering and deceleration effect is also better.

[0043] During the downward movement, the ratchet 23 on the side of the moving block 14 moves downward synchronously, and the pawl 26, hinged to the mounting block 25, slides over the tooth surface of the ratchet 23 one tooth at a time. When the moving block 14 reaches the end of its travel, the pawl 26 engages with the corresponding tooth groove of the ratchet 23. Because the tooth surface of the ratchet 23 is parallel to the horizontal plane, the pawl 26 forms a vertical anti-reverse bearing, which counteracts the rebound force of the second spring 35, locking the second spring 35 in a compressed state and preventing the moving block 14 from rebounding and causing the switch trigger state to fail.

[0044] If the aforementioned limit protections fail to take effect, when the moving block 14 continues to descend to its physical limit position, the end of the sliding plate 2 touches the limiting structure of the base 1, causing the sliding plate 2 to slide laterally relative to the moving block 14. The V-shaped groove 21 in the middle of the sliding plate 2 presses against the protrusion 18 as it is displaced, causing the locking block 17 to compress the first spring 19 and radially exit the locking groove 16, releasing the circumferential lock between the threaded sleeve 15 and the moving block 14. At this time, the threaded sleeve 15 rotates freely with the first threaded rod 13, cutting off the power transmission from the motor 36 to the moving block 14, preventing the motor 36 from stalling and burning out, and the rigidity of the transmission pair from being damaged.

[0045] Meanwhile, when the moving block 14 reaches its end position, the mechanical displacement directly triggers the reversing switch 29 on the mounting base 28, switching the power supply phase sequence of the motor 36, forcing the motor 36 into reverse mode, and driving the gate to perform the return stroke. This reversing trigger does not rely on the calculation of the electrical control system and can still take effect in the event of a control system failure, achieving self-healing.

[0046] When it is necessary to release the lock and reset the gate, turn the knob 27 on the outside of the base 1 to drive the second threaded rod 24 to rotate synchronously. Through the threaded transmission, the mounting block 25 moves laterally in the horizontal direction. The pawl 26, which is hinged to the mounting block 25, moves out of the tooth groove of the ratchet rack 23 with the synchronous horizontal displacement, releasing the one-way locking constraint. After the lock is released, the second spring 35 releases its elastic potential energy and pushes the moving block 14 upward to reset. With the reverse driving force of the motor 36, the threaded sleeve 15 rotates with the first threaded rod 13. When the slot 16 and the block 17 are aligned, the first spring 19 pushes the block 17 to re-engage in the slot 16, restoring the circumferential locking of the threaded sleeve 15 and the moving block 14. The device returns to the normal transmission state, and the gate moves upward and returns.

[0047] The above description is merely a preferred embodiment of the invention; however, the scope of protection of the invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the invention, based on the technical solution and its improved concept, should be covered within the scope of protection of the invention.

Claims

1. A hydraulic gate stroke control device, comprising a base (1), characterized in that: Fixed rods (33) are fixedly connected to both sides of the interior of the base (1). Moving blocks (14) are slidably connected to the outer walls of the two fixed rods (33). First threaded rods (13) are rotatably connected to both sides of the interior of the base (1). Threaded sleeves (15) are rotatably connected to the interior of the moving blocks (14). The threaded sleeves (15) and the first threaded rods (13) are threadedly connected. A baffle (12) is fixedly connected between the two moving blocks (14). The baffle (12) is slidably connected to the base (1). The outer wall of the threaded sleeve (15) is provided with a slot (16), and a locking block (17) is slidably connected inside the moving block (14). One end of the locking block (17) is locked inside the slot (16). Motors (36) are fixedly connected to both sides above the base (1). The output end of the motor (36) is fixedly connected to the upper end of the first threaded rod (13). A power-off wedge (22) and a ratchet rack (23) are fixedly connected to one side of the moving block (14). A second spring is sleeved on the outside of the fixed rod (33). Spring (35), the second spring (35) is located between the moving block (14) and the base (1) below. The base (1) has a hydraulic cavity (4) pre-embedded at the bottom. The fixing rod (33) is fixedly installed on the upper end of the hydraulic cavity (4). A pressure tapping pipe (41) is fixedly connected to the bottom side of the hydraulic cavity (4). The pressure tapping pipe (41) extends to the bottom of the water-facing side of the base (1). A mud and sand prevention net (42) is fixedly installed at the opening of the pressure tapping pipe (41). A perforated partition is fixedly installed inside the hydraulic cavity (4). (43) and divided into an upper hydraulic chamber and a lower pressure chamber. The upper hydraulic chamber is slidably installed with a driving piston (45) and an isolation piston (44) distributed vertically. Hydraulic oil is filled between the driving piston (45) and the isolation piston (44). A piston rod (46) sleeved on a fixed rod (33) is provided at the upper end of the hydraulic chamber (4). Multiple piston rods (46) are fixedly installed between the driving piston (45) and the pre-pressure push ring (47). The second spring (35) is fixedly installed at the upper end of the pre-pressure push ring (47).

2. The hydraulic gate stroke control device according to claim 1, characterized in that: A protrusion (18) is fixedly connected to the middle of one side of the card block (17), and a first spring (19) for resetting is installed above the card block (17).

3. The hydraulic gate stroke control device according to claim 2, characterized in that: The sliding block (14) is slidably connected to a sliding plate (2). Both ends of the sliding plate (2) are located outside the sliding block (14). A V-groove (21) is provided in the middle of the sliding plate (2). The protrusion (18) is slidably connected inside the V-groove (21).

4. The hydraulic gate stroke control device according to claim 1, characterized in that: The base (1) has a second threaded rod (24) rotatably connected to the lower sides on both sides. The outer wall of the second threaded rod (24) is threaded with a mounting block (25). A pawl (26) is rotatably connected to one side of the mounting block (25). The pawl (26) engages with the ratchet rack (23). A knob (27) is fixedly connected to one end of the second threaded rod (24) located outside the base (1).

5. The hydraulic gate stroke control device according to claim 1, characterized in that: Mounting bases (28) are fixedly connected to the lower sides of both sides of the base (1), and a reversing switch (29) is installed on the upper side of the mounting bases (28).

6. The hydraulic gate stroke control device according to claim 1, characterized in that: Power-off switches (3) are fixedly connected to the middle of both sides of the base (1). Some of the power-off switches (3) are rotatably connected to swing arms (31). The ends of the swing arms (31) are rotatably connected to wheels (32). The wheels (32) are located below the power-off wedges (22).

7. The hydraulic gate stroke control device according to claim 1, characterized in that: Both sides of the base (1) are fixedly connected to a limiting plate (11), and the baffle (12) and the limiting plate (11) are slidably connected.

8. A hydraulic gate stroke control device according to claim 7, characterized in that: Water-blocking cloths (34) are installed on both sides of the baffle (12), and the water-blocking cloths (34) are located inside the limiting plate (11).

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