Double drive fast open and close hand hydraulic flat gate valve

Abstract

The application relates to the technical field of gate valves and discloses a double-drive quick opening and closing hand hydraulic flat gate valve which comprises a gate valve body, a valve seat, a valve cover and a valve rod, flange plates are integrally formed at the two ends of the gate valve body; the valve seat is integrally arranged at the upper end of the middle part of the gate valve body, an installation plate one is fixedly arranged at the upper end of the valve seat, an installation plate two is fixedly arranged at the lower end of the valve cover, a shaft ring is fixedly arranged at the upper end of the valve cover, the valve rod is arranged in the shaft ring and is in sliding fit with the shaft ring, a gate plate is fixedly arranged at the bottom of the valve rod, and the gate plate is located in the internal flow channel of the gate valve body; a hydraulic drive assembly for driving the valve rod to axially ascend and descend is connected to the upper end of the valve rod; a manual control assembly for driving the valve rod to move up and down is connected to the side of the valve rod. The hydraulic drive and the manual drive share the same valve rod guiding system, the two sets of driving units do not interfere with each other and are seamlessly switched, and the emergency operation ability under extreme scenes such as pressure loss of the hydraulic system and power failure is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of gate valve technology, specifically to a dual-drive quick-opening and closing manual hydraulic flat gate valve. Background Technology

[0002] Existing flat gate valves include a valve body, valve seat, valve stem, gate, valve cover, and operating mechanism. The valve seat is located within the valve body, the gate fits tightly against the valve seat, one end of the valve stem is connected to the gate, and the other end is connected to the operating mechanism. The valve cover is fixedly connected to the valve body. When the gate is partially opened, the valve seat and gate will be subjected to strong scouring by the high-pressure throttling medium. If the existing soft-seal structure is used, the soft sealing material of the valve seat is partially exposed to the medium and is quickly eroded by the medium, causing pits to form, resulting in the failure of the sealing performance after the valve is opened once. In addition, the existing gate and valve seat are also easily worn under the strong scouring of the high-pressure throttling medium, leading to defects such as reduced valve sealing performance and shortened service life.

[0003] Existing manual-hydraulic flat gate valves mainly suffer from the following technical problems: The valve stem generally adopts a single-point guiding structure, resulting in insufficient radial constraint capacity. During lifting and lowering, swaying and gate tilting easily occur, leading to severe uneven wear of the sealing surface, shortened service life, and the eccentric force of the medium under high pressure differential conditions further exacerbating the risk of seal failure. Hydraulic drives mostly use rigid flange direct connections, and coaxiality errors in machining and installation easily cause piston rod damage and uneven wear of seals, resulting in a high equipment failure rate. Furthermore, the uneven load distribution of the hydraulic cylinder support structure easily leads to structural deformation under high-frequency opening and closing conditions, resulting in insufficient operational stability. The manual operating mechanism has a large guide clearance, easily causing shaking and jamming during operation, mostly due to sliding friction, resulting in high operating resistance and labor. The locking mechanism is mostly a pin-type fixed-point locking, with poor adaptability and susceptibility to loosening due to pipeline vibration. Therefore, corresponding technical solutions need to be designed to address these issues. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a dual-drive quick-opening and closing manual hydraulic flat gate valve, which solves the technical problems.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: a dual-drive quick-opening and closing manual hydraulic flat gate valve, comprising a gate valve body, a valve seat, a valve cover and a valve stem, wherein flanges are integrally formed at both ends of the gate valve body; The valve seat is integrally disposed in the upper middle part of the gate valve body. A mounting plate one is fixedly disposed on the upper end of the valve seat, and a mounting plate two is fixedly disposed on the lower end of the valve cover. The mounting plate one and the mounting plate two are fastened together circumferentially by bolts. A collar is fixedly provided at the upper end of the valve cover, the valve stem passes through the collar and slides with it, and a gate is fixedly provided at the bottom of the valve stem. The gate is located in the internal flow channel of the gate valve body. The upper end of the valve stem is connected to a hydraulic drive assembly for driving the valve stem to move axially. The valve stem is connected to a manual control assembly on its side for moving the valve stem up and down.

[0006] Preferably, an end plate is fixedly provided at the upper end of the valve stem; The hydraulic drive assembly includes a hydraulic cylinder, a hydraulic column, a bearing seat, and a connecting column. The hydraulic column is connected to the output end of the hydraulic cylinder. The bearing seat is fixed to the lower end of the hydraulic column. The upper end of the connecting column is hinged to the bearing seat. The lower end of the connecting column is fixed with a mounting plate. The mounting plate is fastened to the end plate by bolts. The end plate is fixed to the upper end of the valve stem and is used for docking and mounting the valve stem and the hydraulic drive assembly, distributing the connection load. The hydraulic cylinder is the main power source of the hydraulic drive, driving the hydraulic column to extend and retract through hydraulic oil pressure to output linear power. The hydraulic column is the output actuator of the hydraulic cylinder, extending and retracting axially with the hydraulic pressure to transmit the opening and closing driving force. The bearing is fixed to the lower end of the hydraulic column and cooperates with the connecting column to form a hinge structure, providing a hinge rotation fulcrum. The upper end of the connecting column is hinged to the bearing, and the lower end is connected to the valve stem, which can automatically compensate for the coaxiality error between the hydraulic column and the valve stem. The mounting plate is fixed to the lower end of the connecting column and is fastened to the end plate with bolts to achieve a reliable connection between the hydraulic drive assembly and the valve stem.

[0007] Preferably, the upper and lower ends of the side of the hydraulic cylinder are respectively connected to an oil inlet pipe and an oil outlet pipe, the upper end of the hydraulic cylinder is fixed with an N-shaped fixing rod, and the front and rear sides of the hydraulic cylinder are both fixed with fixing rods, and the upper ends of the fixing rods are both fixed with pads. The inlet pipe connects to the upper part of the hydraulic cylinder, supplying pressurized oil to drive the hydraulic column to extend downwards; the outlet pipe connects to the lower part of the hydraulic cylinder, discharging hydraulic oil and coordinating with the inlet action to retract the hydraulic column; fixed rod one is N-shaped and fixed at the upper end of the hydraulic cylinder, supporting the hydraulic cylinder together with fixed rod two and distributing the installation load; fixed rod two is located on the front and rear sides of the hydraulic cylinder, extending upwards to support the hydraulic cylinder and improve the installation stability of the hydraulic drive assembly; pads are fixed at the upper ends of each fixed rod, increasing the support contact area and evenly distributing the installation load of the hydraulic cylinder.

[0008] Preferably, the manual control component includes a fixed frame, a crossbar, a limiting rod, and a baffle. The fixed frame is fixed to the upper side of the mounting plate two, and limiting grooves are symmetrically formed on both side walls of the fixed frame. The crossbar is fixedly installed on the side of the valve stem, and the end of the crossbar passes through the fixing frame; The limiting rod passes through the end of the crossbar, and both ends of the limiting rod extend into the limiting groove on the corresponding side and slide in cooperation with it; The baffle is fixedly installed at both ends of the limiting rod, and the baffle slides against the outer side wall of the fixed frame; A handle is fixedly provided at the outer end of the crossbar, and a hand handle is fixedly connected between the bottom of the crossbar and the handle; The mounting bracket is fixed to both sides of the mounting plate, serving as the overall mounting carrier for the manual control components, and includes a guide and positioning structure. The crossbar is fixed to the side of the valve stem, transmitting manual operating force and driving the valve stem to rise and fall synchronously, while also acting as a circumferential limit. The limit rod passes through the end of the crossbar, with both ends embedded in the limit grooves, sliding along the grooves as the crossbar rises and falls, thus constraining the movement trajectory. The baffle is fixed to both ends of the limit rod, sliding against the outside of the mounting bracket to prevent the limit rod from coming out, while also bearing the elasticity and locking components. The limit grooves are located on both sides of the mounting bracket, slidingly engaging with the limit rods to provide linear guidance and circumferential anti-rotation constraint for the valve stem's rise and fall. The handle is fixed to the outer end of the crossbar, serving as the force application point for manual operation, facilitating the operator to apply opening and closing force. The hand grip connects the crossbar and the bottom of the handle, forming a double grip structure, improving the stability and ease of force application during manual operation.

[0009] Preferably, the outer ends of the fixing frame are provided with sliding grooves, and an elastic support cylinder is slidably disposed in the sliding grooves; The elastic support cylinder is provided with telescopic rods and support springs arranged alternately along the circumference. The inner ends of the telescopic rods and support springs are fixedly connected to the inner end face of the baffle. The slide groove is located on the outside of the fixed frame and slides in conjunction with the elastic support cylinder to provide a lifting guide for the inner elastic support structure. The elastic support cylinder is embedded in the slide groove and slides, serving as the outer support end of the inner elastic structure, and rises and falls synchronously with the baffle. The telescopic rods are staggered in the elastic support cylinder to limit the direction of elastic extension and contraction and prevent radial instability of the support spring. The support springs are staggered in the elastic support cylinder to provide radial elastic preload, eliminate the fit gap, and buffer the vibration during operation.

[0010] Preferably, the outer end of the fixing frame is provided with symmetrical positioning grooves, and the positioning grooves are connected to the corresponding sliding grooves; One end of the baffle is fixedly provided with an extension plate one, and the upper end of the extension plate one is fixedly provided with an extension plate two. A screw cylinder is fixedly inserted through the extension plate two, and an adjusting screw is threaded through the screw cylinder. A locking rubber head is fixedly provided at the inner end of the adjusting screw, and a fixed plate is fixedly provided at the outer end of the adjusting screw. A handle is eccentrically rotatably connected to the outer end face of the fixed plate. The positioning groove is located at the outer end of the fixed frame and is connected to the slide groove, so as to allow the locking rubber head to press and position, thereby locking the opening and closing position.

[0011] Extension plate one is fixed to the end of the baffle, extending outward to support the locking assembly, and rises and falls synchronously with the baffle; extension plate two is fixed to the upper end of extension plate one, used to install the fixing screw, providing an installation reference for the adjusting screw; the screw is fixed inside extension plate two, threadedly engaged with the adjusting screw, converting rotation into axial feed; the adjusting screw is threadedly engaged with the screw, achieving axial feed through rotation, driving the locking rubber head to tighten or loosen; the locking rubber head is fixed to the inner end of the adjusting screw, pressed into the positioning groove, relying on friction to achieve position locking, while also reducing vibration and preventing loosening; the fixed plate is fixed to the outer end of the adjusting screw, supporting the handle, increasing the rotational torque, and facilitating the operator's tightening; the handle is eccentrically rotatably connected to the outside of the fixed plate, serving as the handheld part for locking operation, saving effort and providing convenience.

[0012] Preferably, a protruding plate is fixedly provided at the other end of the baffle, a support plate is fixedly provided at the outer end of the protruding plate, a side plate is fixedly provided at the other end of the support plate, and movable grooves are correspondingly provided in the protruding plate and the side plate; A fixed shaft is slidably disposed within the movable groove, and a compression spring is disposed between the fixed shaft and the inner wall of the movable groove. A movable shaft is fixedly installed between the two fixed shafts. An auxiliary roller is rotatably sleeved on the outer side of the movable shaft. The outer wall of the auxiliary roller slides against the outer wall of the fixed frame. A convex plate is fixed to the other end of the baffle, extending outward to support the roller assembly and rising and falling synchronously with the baffle. A support plate connects the convex plate and the side plate, forming the mounting frame for the roller assembly and limiting the range of motion of the movable shaft. The side plate is fixed to the outer end of the support plate and has a movable groove corresponding to the convex plate, providing sliding guidance for the fixed shaft. The movable groove is opened inside the convex plate and the side plate, slidingly engaging with the fixed shaft to limit the radial movement trajectory of the auxiliary roller. The fixed shaft is slidably set in the movable groove, connecting the movable shaft and transmitting the elastic force of the compression spring. The compression spring is set in the movable groove, providing radial preload for the fixed shaft and the auxiliary roller, ensuring that the roller always fits against the fixed frame. The movable shaft is fixed between the two fixed shafts, providing rotational support for the auxiliary roller. The auxiliary roller rotates and is sleeved outside the movable shaft, rolling against the outer wall of the fixed frame, converting sliding friction into rolling friction and reducing operating resistance.

[0013] Preferably, a limiting ring is slidably sleeved on the lower outer side of the valve stem, and connecting plates are fixedly connected to both sides of the limiting ring. An adapter rod is fixedly connected between the outer end of the connecting plate and the fixing frame. The limiting ring is slidably sleeved on the lower part of the valve stem, providing radial guidance constraint for the valve stem and reducing the lower part of the valve stem wobble; the connecting plate is fixedly connected to both sides of the limiting ring, transmitting the support force and connecting the limiting ring and the adapter rod; the adapter rod connects the connecting plate and the fixed frame, transferring the load of the limiting ring to the fixed frame, ensuring the installation stability of the lower guide structure.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) By adopting a double-support coaxial guide structure with an upper shaft collar guide and a lower limiting ring constraint, the shaft collar fixedly set at the upper end of the valve cover provides upper radial limit for the valve stem, and the valve stem passes through the shaft collar and forms a precision sliding fit; at the same time, the limiting ring is slidably sleeved on the lower outer side of the valve stem, and the limiting ring is fixedly connected to the side of the fixed frame through the connecting plates on both sides and the adapter rod, forming an independent lower radial support point. The upper and lower guide supports are distributed at a long distance along the valve stem axis, which greatly improves the radial constraint capability during the valve stem lifting process, effectively avoids the valve stem wobble and gate tilt problems that are easy to occur with single-support guide, ensures that the gate and valve seat sealing surface always maintain uniform contact, significantly reduces the eccentric wear rate of the sealing surface, and extends the overall service life of the gate valve; especially under high pressure differential conditions, the double-support guide can offset the lateral effect of the medium eccentric force on the gate.

[0015] (2) The hydraulic drive assembly serves as the main drive unit, providing the gate valve with high thrust and high efficiency for rapid opening and closing. It also solves the common problems of jamming and uneven wear in rigid connections. The hydraulic cylinder is connected to the hydraulic system through the oil inlet and outlet pipes at the upper and lower ends of the side. The hydraulic cylinder is driven by the inlet and outlet of the hydraulic oil to perform axial extension and retraction, thereby driving the valve stem to achieve rapid opening and closing. Compared with pure manual drive, the opening and closing time of large-diameter gate valves can be greatly shortened, which is suitable for the on / off requirements under emergency conditions. The N-shaped fixing rod 1 set at the upper end of the hydraulic cylinder and the fixing rod 2 on the front and rear sides form a multi-directional three-dimensional support structure. The pad at the upper end can evenly distribute the installation load of the hydraulic cylinder, avoid structural deformation caused by local stress concentration, improve the installation stability of the hydraulic drive assembly under high-frequency opening and closing conditions, and ensure the continuous and reliable operation of the hydraulic drive.

[0016] (3) The manual control component is an emergency drive and fine-tuning unit. The fixed frame is fixed to the upper part of the two sides of the mounting plate as the bearing reference of the manual component. The crossbar is fixedly connected to the side of the valve stem and extends into the inside of the fixed frame. The two ends of the limit rod passing through the end of the crossbar extend into the limit grooves on both sides of the fixed frame and form a sliding fit. Through the cooperation of the limit groove and the limit rod, it not only provides circumferential anti-rotation constraint for the lifting and lowering of the valve stem, ensuring that the gate always runs along the axial direction without deflection, but also forms a linear motion guide for manual operation. The double grip point operation structure composed of the handle and the hand lever conforms to the ergonomic force application habit, making it easier for the operator to apply a larger operating torque and improve the labor-saving effect of manual opening and closing. A double-sided elastic follow-up support structure is set between the baffle and the fixed frame, forming a symmetrical clamping effect of inner elastic sliding support and outer elastic rolling support. The baffle is fixed to both ends of the limiting rod. The inner side is connected to the support spring through staggered telescopic rods and elastic support cylinders. The elastic support cylinders are embedded in the sliding grooves of the fixed frame to form a sliding fit, providing inner elastic tension. The outer side of the baffle is equipped with an elastic rolling support structure consisting of a movable shaft, a fixed shaft, a compression spring, and an auxiliary roller, which is mounted on the mounting frame composed of a protruding plate, a support plate, and a side plate. The auxiliary roller slides against the fixed frame. The outer wall converts sliding friction into rolling friction; when the two sets of structures work together, the support spring and the compression spring jointly provide radial preload, always eliminating the gap between the limit rod and the limit groove, and avoiding shaking and jamming during the valve rod lifting process; at the same time, the auxiliary roller greatly reduces frictional resistance, making the opening and closing operation easier and smoother; the elastic structures on both sides can adaptively adjust to the slight dimensional error of the fixed frame surface, always maintaining a balanced support force, ensuring that the baffle remains parallel to the fixed frame during the lifting process, further improving the stability and positioning accuracy of manual operation. The screw-type locking and positioning mechanism has symmetrical positioning grooves on the outer end of the fixed frame, which are connected to the sliding groove. The extension plate one and extension plate two at the end of the baffle rise and fall synchronously with the baffle. An adjusting screw is threaded through the screw cylinder fixed inside the extension plate two. The inner end of the screw cylinder is equipped with a locking rubber head, and the outer end is connected to the eccentric handle through the fixed plate. When the gate valve is opened or closed to the target position, the handle is rotated to drive the adjusting screw to feed radially, so that the locking rubber head is pressed into the positioning groove. The axial position is reliably locked by the elastic deformation of the rubber and the static friction.

[0017] (4) The hydraulic drive and manual drive share the same valve stem guiding system. The two drive units do not interfere with each other and can switch seamlessly: When hydraulically driven, the crossbar rises and falls synchronously with the valve stem, and the manual components move as a whole without interference; when manually driven, the hydraulic column moves synchronously with the valve stem. The dual drive architecture not only meets the needs of rapid opening and closing under normal working conditions, but also ensures the emergency operation capability under extreme scenarios such as hydraulic system pressure loss and power failure, which greatly improves the working condition adaptability and operational reliability of the gate valve. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the overall structure of the invention from a top-side view. Figure 2 This is a schematic diagram of the overall structure from the top view on the other side of the present invention; Figure 3 This is a schematic diagram of the internal structure of the gate valve of the present invention; Figure 4 For the present invention Figure 1 Enlarged structural diagram at point A in the middle; Figure 5 This is a schematic diagram of the hydraulic control component of the present invention; Figure 6 This is a schematic diagram of the manual adjustment mechanism from the upper side view of the present invention; Figure 7 This is a schematic diagram of the manual adjustment mechanism from the upper view on the other side; Figure 8 For the present invention Figure 6 Enlarged structural diagram at point B; Figure 9 For the present invention Figure 7 Enlarged structural diagram at point C; Figure 10 This is a schematic diagram of the elastic limiting sliding structure of the present invention; Figure 11 This is a schematic diagram of the elastic support cylinder structure of the present invention.

[0019] In the diagram: 1. Gate valve body; 11. Flange; 2. Valve seat; 21. Mounting plate one; 3. Valve cover; 31. Mounting plate two; 32. Collar; 4. Fixing bracket; 41. Limiting groove; 42. Sliding groove; 43. Positioning groove; 5. Valve stem; 51. Gate; 52. End plate; 6. Hydraulic cylinder; 601. Oil inlet pipe; 602. Oil outlet pipe; 61. Hydraulic column; 62. Shaft seat; 63. Connecting column; 631. Mounting plate; 64. Fixing rod one; 65. Fixing rod two; 66. Pad plate; 7. Limiting ring; 71. Connecting plate; 72. Adapter rod; 8. Crossbar; 81. Limiting rod; 82. Handle; 83. Handheld rod; 84. Baffle; 85. Extension plate one; 851. Extension plate two; 86. Screw barrel; 861. Adjusting screw; 862. Locking rubber head; 863. Fixing plate; 864. Grip; 87. Elastic support cylinder; 871. Telescopic rod; 872. Support spring; 9. Auxiliary roller; 91. Convex plate; 92. Support plate; 93. Movable shaft; 94. Fixed shaft; 95. Side plate; 96. Movable groove; 97. Compression spring. 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] Please see Figures 1-11 The present invention provides a technical solution: a dual-drive quick-opening and closing manual hydraulic flat gate valve, including a gate valve body 1, a valve seat 2, a valve cover 3 and a valve stem 5, and flanges 11 integrally formed at both ends of the gate valve body 1; The valve seat 2 is integrally set in the middle of the upper end of the gate valve body 1. The upper end of the valve seat 2 is fixedly provided with a mounting plate 21, and the lower end of the valve cover 3 is fixedly provided with a mounting plate 31. The mounting plate 21 and the mounting plate 31 are fastened together in the circumferential direction by bolts. A collar 32 is fixedly provided at the upper end of the valve cover 3, and the valve stem 5 passes through the collar 32 and slides with it. A gate 51 is fixedly provided at the bottom of the valve stem 5, and the gate 51 is located in the internal flow channel of the gate valve body 1. The upper end of the valve stem 5 is connected to a hydraulic drive assembly for driving the valve stem 5 to move axially. The valve stem 5 is connected to a manual control component on its side for moving the valve stem 5 up and down.

[0022] The gate valve body 1 is the main supporting base of the gate valve, forming the internal medium flow channel and providing the installation foundation for all internal and external functional components. The valve seat 2 is located at the upper end of the gate valve body 1, serving as the lower installation reference for the valve cover 3 and the drive assembly, and working with the gate 51 to achieve the sealing and opening / closing of the flow channel. The valve cover 3 is used to close the upper opening of the gate valve body 1, providing installation support and a sealing foundation for the valve stem 5 and the upper drive assembly. The valve stem 5 is the core transmission component for opening and closing, used to transmit the lifting driving force and drive the gate 51 to move axially. The flange 11 is integrally formed at both ends of the gate valve body 1, used for the docking installation of the gate valve with external pipelines, ensuring connection strength and sealing performance. The mounting plate 21 is fixed to the upper end of the valve seat 2, and... Mounting plate 2 31 is used to securely connect valve seat 2 and valve cover 3. Mounting plate 2 31 is fixed to the lower end of valve cover 3 and is fastened to mounting plate 1 21 with bolts to ensure the stability and sealing of valve cover 3 installation. The collar 32 is fixed to the upper end of valve cover 3 to provide upper radial guidance and sliding support for valve stem 5 and to constrain the radial sway of valve stem 5. The gate 51 is fixed to the bottom of valve stem 5 and moves up and down with valve stem 5 to block or open the flow channel to realize the on / off control of the medium. The hydraulic drive component is the main drive unit, which outputs a large thrust to drive valve stem 5 to move up and down axially quickly to realize the rapid opening and closing of the gate valve. The manual control component is a backup and fine-tuning drive unit. When the hydraulic system fails or fine-tuning is required, the valve stem 5 can be manually driven to complete the opening and closing action.

[0023] Further improved, an end plate 52 is fixed to the upper end of the valve stem 5; The hydraulic drive assembly includes a hydraulic cylinder 6, a hydraulic column 61, a bearing 62, and a connecting column 63. The hydraulic column 61 is connected to the output end of the hydraulic cylinder 6. The bearing 62 is fixed to the lower end of the hydraulic column 61. The upper end of the connecting column 63 is hinged to the bearing 62. The lower end of the connecting column 63 is fixed with a mounting plate 631. The mounting plate 631 is fastened to the end plate 52 by bolts. End plate 52 is fixed to the upper end of valve stem 5 and is used for docking and installation of valve stem 5 and hydraulic drive assembly, distributing the connection load; hydraulic cylinder 6 is the power source of hydraulic drive, which drives hydraulic column 61 to extend and retract through hydraulic oil pressure to output linear power; hydraulic column 61 is the output actuator of hydraulic cylinder 6, which extends and retracts axially with hydraulic pressure to transmit opening and closing driving force; shaft seat 62 is fixed to the lower end of hydraulic column 61 and cooperates with connecting column 63 to form a hinge structure, providing a hinge rotation fulcrum; the upper end of connecting column 63 is hinged in shaft seat 62, and the lower end is connected to valve stem 5, which can automatically compensate for the coaxiality error between hydraulic column 61 and valve stem 5; mounting plate 631 is fixed to the lower end of connecting column 63 and is fastened to end plate 52 with bolts to realize reliable connection between hydraulic drive assembly and valve stem 5.

[0024] Further improvements include an oil inlet pipe 601 and an oil outlet pipe 602 connected to the upper and lower ends of the side of the hydraulic cylinder 6, an N-shaped fixing rod 64 fixed at the upper end of the hydraulic cylinder 6, and fixing rods 65 fixed upward on both the front and rear sides of the hydraulic cylinder 6. A pad 66 is fixed at the upper end of both the fixing rod 64 and the fixing rod 65. The oil inlet pipe 601 is connected to the upper part of the hydraulic cylinder 6, and pressurized oil is introduced to drive the hydraulic column 61 to extend downward; the oil outlet pipe 602 is connected to the lower part of the hydraulic cylinder 6, and hydraulic oil is discharged, which, together with the oil inlet action, realizes the retraction of the hydraulic column 61; the first fixing rod 64 is fixed in an N-shape at the upper end of the hydraulic cylinder 6, and together with the second fixing rod 65, supports the hydraulic cylinder 6 and distributes the installation load; the second fixing rod 65 is located on the front and rear sides of the hydraulic cylinder 6, extending upward to support the hydraulic cylinder 6 and improve the installation stability of the hydraulic drive assembly; the pad 66 is fixed at the upper end of each fixing rod, increasing the support contact area and evenly distributing the installation load of the hydraulic cylinder 6.

[0025] Further improvements include a fixed frame 4, a crossbar 8, a limit bar 81, and a baffle 84. The fixed frame 4 is fixed to the upper side of the mounting plate 31, and limit grooves 41 are symmetrically opened on both sides of the fixed frame 4. The crossbar 8 is fixedly installed on the side of the valve stem 5, and the end of the crossbar 8 passes through the fixing frame 4; The limiting rod 81 passes through the end of the crossbar 8, and both ends of the limiting rod 81 extend into the limiting groove 41 on the corresponding side and slide with it. The baffle 84 is fixedly installed at both ends of the limiting rod 81, and the baffle 84 slides against the outer side wall of the fixed frame 4; A handle 82 is fixedly installed at the outer end of the crossbar 8, and a hand handle 83 is fixedly connected between the bottom of the crossbar 8 and the handle 82; The fixed frame 4 is fixed to the side of the mounting plate 31, serving as the overall mounting carrier for the manual control components and providing a guide and positioning structure. The crossbar 8 is fixed to the side of the valve stem 5, transmitting manual operating force and driving the valve stem 5 to rise and fall synchronously, while also serving as a circumferential limit. The limit rod 81 passes through the end of the crossbar 8, with both ends embedded in the limit groove 41, sliding along the groove as the crossbar 8 rises and falls, thus constraining the movement trajectory. The baffle 84 is fixed to both ends of the limit rod 81, sliding against the outside of the fixed frame 4 to prevent the limit rod 81 from coming out, while also bearing the elasticity and locking components. The limit groove 41 is opened on both sides of the fixed frame 4, slidingly engaging with the limit rod 81 to provide linear guidance and circumferential anti-rotation constraint for the rise and fall of the valve stem 5. The handle 82 is fixed to the outer end of the crossbar 8, serving as the force application point for manual operation, facilitating the operator to apply opening and closing force. The hand lever 83 is connected to the bottom of the crossbar 8 and the handle 82, forming a double grip structure, improving the stability and ease of force application for manual operation.

[0026] Further improvements include the addition of sliding grooves 42 at both ends of the outer side of the fixing frame 4, with elastic support cylinders 87 slidably disposed within the sliding grooves 42; The elastic support cylinder 87 is provided with telescopic rods 871 and support springs 872 arranged alternately along the circumference. The inner ends of the telescopic rods 871 and support springs 872 are fixedly connected to the inner end face of the baffle 84. The slide groove 42 is located on the outside of the fixed frame 4 and slides in cooperation with the elastic support cylinder 87 to provide a lifting guide for the inner elastic support structure. The elastic support cylinder 87 is embedded in the slide groove 42 and slides as the outer support end of the inner elastic structure, and rises and falls synchronously with the baffle 84. The telescopic rods 871 are staggered in the elastic support cylinder 87 to limit the direction of elastic extension and prevent the support spring 872 from becoming radially unstable. The support springs 872 are staggered in the elastic support cylinder 87 to provide radial elastic preload, eliminate the fit gap, and buffer the running vibration.

[0027] Further improvements include symmetrically arranged positioning grooves 43 on the outer end of the fixing frame 4, which are connected to the corresponding sliding grooves 42. One end of the baffle 84 is fixedly provided with an extension plate 85, the upper end of the extension plate 85 is fixedly provided with an extension plate 851, a screw cylinder 86 is fixedly inserted through the extension plate 851, an adjusting screw 861 is threaded through the screw cylinder 86, a locking rubber head 862 is fixedly provided at the inner end of the adjusting screw 861, a fixing plate 863 is fixedly provided at the outer end of the adjusting screw 861, and a handle 864 is eccentrically rotatably connected to the outer end face of the fixing plate 863. The positioning groove 43 is located at the outer end of the fixed frame 4 and is connected to the slide groove 42, so as to allow the locking rubber head 862 to press and position, thereby locking the opening and closing position.

[0028] Extension plate 1 85 is fixed to the end of baffle 84, extending outward to support the locking assembly, and rises and falls synchronously with baffle 84; Extension plate 2 851 is fixed to the upper end of extension plate 1 85, used to install and fix screw cylinder 86, providing an installation reference for adjusting screw 861; Screw cylinder 86 is fixed inside extension plate 2 851, threadedly engaged with adjusting screw 861, converting rotation into axial feed; Adjusting screw 861 is threadedly engaged with screw cylinder 86, achieving axial feed through rotation, driving locking rubber head 862 to tighten or loosen; Locking rubber head 862 is fixed to the inner end of adjusting screw 861, pressed into positioning groove 43, relying on friction to achieve position locking, while also reducing vibration and preventing loosening; Fixed plate 863 is fixed to the outer end of adjusting screw 861, supporting handle 864, increasing rotational torque, and facilitating operator tightening; Handle 864 is eccentrically rotatably connected to the outer side of fixed plate 863, serving as the handheld part for locking operation, saving effort and providing convenience.

[0029] Further improvements include a protruding plate 91 fixed at the other end of the baffle 84, a support plate 92 fixed at the outer end of the protruding plate 91, a side plate 95 fixed at the other end of the support plate 92, and movable grooves 96 corresponding to those in the protruding plate 91 and the side plate 95. A fixed shaft 94 is slidably disposed inside the movable groove 96, and a compression spring 97 is disposed between the fixed shaft 94 and the inner wall of the movable groove 96. A movable shaft 93 is fixedly installed between the two fixed shafts 94. An auxiliary roller 9 is rotatably sleeved on the outer side of the movable shaft 93. The outer wall of the auxiliary roller 9 slides against the outer wall of the fixed frame 4. A protruding plate 91 is fixed to the other end of the baffle 84, extending outward to support the roller assembly and rising and falling synchronously with the baffle 84. A support plate 92 connects the protruding plate 91 and the side plate 95, forming an installation frame for the roller assembly and limiting the range of motion of the movable shaft 93. The side plate 95 is fixed to the outer end of the support plate 92 and has a movable groove 96 corresponding to the protruding plate 91, providing a sliding guide for the fixed shaft 94. The movable groove 96 is formed inside the protruding plate 91 and the side plate 95, slidingly engaging with the fixed shaft 94 to limit the radial movement trajectory of the auxiliary roller 9. The fixed shaft 94 is slidably disposed within the movable groove 96, connecting to the movable shaft 93 and transmitting the elastic force of the compression spring 97. The compression spring 97 is disposed within the movable groove 96, providing radial preload to the fixed shaft 94 and the auxiliary roller 9, ensuring that the roller always fits against the fixed frame 4. The movable shaft 93 is fixed between the two fixed shafts 94, providing rotational support for the auxiliary roller 9. The auxiliary roller 9 is rotatably sleeved outside the movable shaft 93, rolling against the outer wall of the fixed frame 4, converting sliding friction into rolling friction, and reducing operating resistance.

[0030] Specifically, a limiting ring 7 is slidably sleeved on the lower outer side of the valve stem 5, and connecting plates 71 are fixedly connected to both sides of the limiting ring 7. A connecting rod 72 is fixedly connected between the outer end of the connecting plate 71 and the fixed frame 4. The limiting ring 7 is slidably sleeved on the lower part of the valve stem 5 to provide radial guidance constraint for the lower part of the valve stem 5 and reduce the lower part of the valve stem 5 to wobble; the connecting plate 71 is fixedly connected to both sides of the limiting ring 7 to transmit the support force and connect the limiting ring 7 to the adapter rod 72; the adapter rod 72 connects the connecting plate 71 to the fixing frame 4 and transmits the load of the limiting ring 7 to the fixing frame 4 to ensure the installation stability of the lower guide structure.

[0031] Working principle:

[0032] 1. Hydraulic circuit setup The oil inlet pipe 601 and oil outlet pipe 602 at the upper and lower ends of the side of the hydraulic cylinder 6 are connected to the external hydraulic control system to form a complete hydraulic power circuit, providing a power source for the opening and closing action.

[0033] 2. Valve opening procedure The hydraulic control system supplies oil to the oil outlet pipe 602 and returns oil to the oil inlet pipe 601. The pressure in the lower chamber of the hydraulic cylinder 6 increases, driving the hydraulic column 61 to retract upward. The lower end of the hydraulic column 61, the bearing seat 62, drives the connecting column 63 to rise synchronously. The mounting plate 631 is fastened to the end plate 52 by bolts, and the linear driving force is transmitted to the valve stem 5. The valve stem 5 slides upward along the double-support guide structure formed by the upper end collar 32 and the lower end limiting ring 7; wherein the limiting ring 7 is fixed to the side of the fixed frame 4 through the connecting plate 71 and the adapter rod 72, forming a stable lower radial constraint; The valve stem 5 drives the bottom gate 51 to rise synchronously, and the internal flow channel of the gate valve body 1 is gradually opened until the gate 51 is fully raised, completing the valve opening action.

[0034] 3. Valve closing procedure The hydraulic control system supplies oil to the inlet pipe 601 and returns oil to the outlet pipe 602. The pressure in the upper chamber of the hydraulic cylinder 6 increases, driving the hydraulic column 61 to extend downward. The valve stem 5 is driven to move downward along the double guide fulcrum through the hinged transmission structure of the bearing 62 and the connecting column 63; the hinged structure can automatically compensate for the coaxiality error between the hydraulic column 61 and the valve stem 5 to avoid jamming. As the valve stem 5 falls, the gate 51 gradually blocks the internal flow channel of the gate valve body 1 until the gate 51 and the sealing surface of the valve seat 2 are completely in contact, thus completing the valve closing action. During the opening and closing process, the N-shaped fixing rod 64 at the upper end of the hydraulic cylinder 6, the front and rear side fixing rods 65, and the top pad 66 together distribute the load to avoid local stress deformation and ensure the structural stability of high-frequency opening and closing.

[0035] When the hydraulic system loses pressure or power, or when precise fine-tuning of valve opening is required, switch to manual operation mode. The steps are as follows: 1. Operation and application of force The operator holds the handle 82 and the hand lever 83 with both hands and applies an upward or downward operating force along the valve stem axis. The dual-grip structure is ergonomic and facilitates the application of greater operating torque.

[0036] 2. Transmission and Guiding Constraints The operating force is transmitted to the valve stem 5 through the crossbar 8, which drives the valve stem 5 to rise and fall axially. The limiting rod 81 at the end of the crossbar 8 is inserted into the limiting groove 41 on both sides of the fixed frame 4 and slides synchronously, which not only constrains the circumferential deflection of the valve stem 5, but also provides precise linear guidance for the lifting and lowering action. During the lifting and lowering of valve stem 5, the upper hydraulic column 61 moves synchronously with valve stem 5. The hinged structure can offset the slight deflection during the movement, and there is no movement interference between the two drive units.

[0037] 3. Double-sided elastic follow-up support The baffle 84 rises and falls synchronously with the limiting rod 81, and the inner elastic support cylinder 87 slides along the slide groove 42 of the fixed frame 4; the telescopic rods 871 and the support springs 872 arranged in an alternating manner inside the elastic support cylinder 87 provide continuous radial preload to the inner side. The auxiliary roller 9 on the outside of the baffle 84 rolls against the outer wall of the fixed frame 4; the compression spring 97 provides radial preload to the auxiliary roller 9 through the fixed shaft 94 and the movable shaft 93, and the movable shaft 93 can adaptively float along the movable groove 96 in the protrusion plate 91 and the side plate 95. The double-sided elastic structure together eliminates the gap between the limiting rod 81 and the limiting groove 41, transforming sliding friction into rolling friction, greatly reducing operating resistance, and ensuring a smooth and unobstructed lifting process.

[0038] Once the gate valve is adjusted to the target opening degree or the fully open / fully closed position, position locking is performed to prevent the gate plate 51 from shifting due to medium pressure or pipeline vibration. The steps are as follows: 1. Locking operation Rotating the handle 864 causes the adjusting screw 861 to rotate inside the screw barrel 86 via the fixed plate 863; the threaded drive converts the rotational motion into axial feed, and the adjusting screw 861 is pushed radially toward the fixed frame 4.

[0039] 2. Positioning and locking The locking rubber head 862 at the inner end of the adjusting screw 861 is pressed into the positioning groove 43 of the fixed frame 4; the rubber is compressed and undergoes elastic deformation, forming a static friction constraint with the inner wall of the positioning groove 43, which completely fixes the axial position of the baffle 84, the limit rod 81, the cross rod 8 and the valve stem 5, so as to achieve reliable locking at any stroke position.

[0040] 3. Unlocking Operation When the valve position needs to be adjusted, rotate the handle 864 in the opposite direction. The adjusting screw 861 will cause the locking rubber head 862 to retract outward and disengage from the positioning groove 43. The locking constraint will be released, and the opening and closing operation can continue.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or basic characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of the invention is defined by the appended technical solutions rather than the foregoing description, and thus all changes falling within the meaning and scope of equivalent elements of the technical solutions are intended to be included within the present invention.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A dual-drive quick-opening and closing manual hydraulic flat gate valve, comprising a gate valve body (1), a valve seat (2), a valve cover (3), and a valve stem (5), characterized in that: The gate valve body (1) has flanges (11) integrally formed at both ends. The valve seat (2) is integrally disposed in the upper middle part of the gate valve body (1). The upper end of the valve seat (2) is fixedly provided with mounting plate one (21), and the lower end of the valve cover (3) is fixedly provided with mounting plate two (31). The mounting plate one (21) and the mounting plate two (31) are fastened together in the circumferential direction by bolts. A collar (32) is fixedly provided at the upper end of the valve cover (3), the valve stem (5) passes through the collar (32) and slides with it, and a gate plate (51) is fixedly provided at the bottom of the valve stem (5), the gate plate (51) is located in the internal flow channel of the gate valve body (1); The upper end of the valve stem (5) is connected to a hydraulic drive assembly for driving the valve stem (5) to move axially. The valve stem (5) is connected to a manual control assembly on its side for moving the valve stem (5) up and down.

2. The dual-drive quick-opening and closing manual hydraulic flat gate valve according to claim 1, characterized in that: An end plate (52) is fixedly provided at the upper end of the valve stem (5); The hydraulic drive assembly includes a hydraulic cylinder (6), a hydraulic column (61), a bearing seat (62), and a connecting column (63). The hydraulic column (61) is connected to the output end of the hydraulic cylinder (6). The bearing seat (62) is fixed to the lower end of the hydraulic column (61). The upper end of the connecting column (63) is hinged to the bearing seat (62). The lower end of the connecting column (63) is fixed with a mounting plate (631). The mounting plate (631) is fastened to the end plate (52) by bolts.

3. The dual-drive quick-opening and closing manual hydraulic flat gate valve according to claim 2, characterized in that: The upper and lower ends of the side of the hydraulic cylinder (6) are respectively connected to an oil inlet pipe (601) and an oil outlet pipe (602). The upper end of the hydraulic cylinder (6) is fixed with an N-shaped fixing rod (64). The front and rear sides of the hydraulic cylinder (6) are fixed with a fixing rod (65) upward. The upper ends of the fixing rod (64) and the fixing rod (65) are both fixed with a pad (66).

4. The dual-drive quick-opening and closing manual hydraulic flat gate valve according to claim 1, characterized in that: The manual control assembly includes a fixed frame (4), a crossbar (8), a limiting rod (81) and a baffle (84). The fixed frame (4) is fixed to the upper side of the mounting plate (31), and the two side walls of the fixed frame (4) are symmetrically provided with limiting grooves (41). The crossbar (8) is fixedly installed on the side of the valve stem (5), and the end of the crossbar (8) passes through the fixing frame (4); The limiting rod (81) passes through the end of the crossbar (8), and both ends of the limiting rod (81) extend into the limiting groove (41) on the corresponding side and slide in cooperation with it. The baffle (84) is fixedly disposed at both ends of the limiting rod (81), and the baffle (84) slides against the outer side wall of the fixing frame (4); A handle (82) is fixedly provided at the outer end of the crossbar (8), and a hand handle (83) is fixedly connected between the bottom of the crossbar (8) and the handle (82).

5. A dual-drive quick-opening and closing manual hydraulic flat gate valve according to claim 4, characterized in that: The outer ends of the fixing frame (4) are provided with sliding grooves (42), and an elastic support cylinder (87) is slidably arranged in the sliding grooves (42). The elastic support cylinder (87) is provided with telescopic rods (871) and support springs (872) interlaced along the circumferential direction. The inner ends of the telescopic rods (871) and support springs (872) are fixedly connected to the inner end face of the baffle (84).

6. A dual-drive quick-opening and closing manual hydraulic flat gate valve according to claim 5, characterized in that: The outer end of the fixed frame (4) is symmetrically provided with positioning grooves (43), and the positioning grooves (43) are connected to the corresponding sliding grooves (42); One end of the baffle (84) is fixedly provided with an extension plate one (85), and the upper end of the extension plate one (85) is fixedly provided with an extension plate two (851). A screw cylinder (86) is fixedly inserted through the extension plate two (851). An adjusting screw (861) is threaded through the screw cylinder (86). A locking rubber head (862) is fixedly provided at the inner end of the adjusting screw (861). A fixing plate (863) is fixedly provided at the outer end of the adjusting screw (861). A handle (864) is eccentrically rotatably connected to the outer end face of the fixing plate (863).

7. A dual-drive quick-opening and closing manual hydraulic flat gate valve according to claim 6, characterized in that: The other end of the baffle (84) is fixedly provided with a protruding plate (91), the outer end of the protruding plate (91) is fixedly provided with a support plate (92), the other end of the support plate (92) is fixedly provided with a side plate (95), and the protruding plate (91) and the side plate (95) are respectively provided with movable grooves (96). A fixed shaft (94) is slidably disposed in the movable groove (96), and a compression spring (97) is disposed between the fixed shaft (94) and the inner wall of the movable groove (96). A movable shaft (93) is fixedly arranged between the two fixed shafts (94). An auxiliary roller (9) is rotatably sleeved on the outer side of the movable shaft (93). The outer wall of the auxiliary roller (9) slides against the outer wall of the fixed frame (4).

8. A dual-drive quick-opening and closing manual hydraulic flat gate valve according to claim 1, characterized in that: A limiting ring (7) is slidably sleeved on the lower outer side of the valve stem (5). A connecting plate (71) is fixedly connected to both sides of the limiting ring (7). A transition rod (72) is fixedly connected between the outer end of the connecting plate (71) and the fixing frame (4).

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