A bottom lifting device for a lift and drop gate

Abstract

The application relates to the technical field of water conservancy projects, and discloses a lifting device for the bottom of a lift gate. The device comprises a flat steel gate, a connecting piece fixed to the bottom of the gate, a steel rod, a pulley assembly, a platform type hoist and a steel wire rope. The bottom end of the steel rod is hinged to the connecting piece at the bottom of the gate, and the top end is slidingly connected to the pulley assembly; the platform type hoist drives the pulley assembly through the steel wire rope, and drives the steel rod and the gate to ascend and descend. The length of the steel rod is greater than the design maximum water level depth of an inland river, so that the connection between the steel wire rope and the pulley assembly is always above the water surface in the closed state of the gate. The device effectively avoids the corrosion and fracture risks of the steel wire rope caused by long-term immersion in water, solves the problem of difficult underwater maintenance, and has the advantages of reasonable structure, safe operation, convenient maintenance and the like.

Description

Technical Field

[0001] This application relates to the field of water conservancy engineering technology, and in particular to a gate opening and closing drive device for water conservancy projects. Background Technology

[0002] The descriptions in this section are intended only to provide background information for the implementation of this application and should not be construed as an admission or implication that they constitute prior art.

[0003] Due to their structural characteristics, lift-and-slide gates are widely used in water conservancy projects. The traditional opening and closing system of a lift-and-slide gate is usually driven by an upper winch that drives a pulley block at the bottom of the gate through a steel wire rope. The gate closes by sliding down under its own weight and is opened by lifting the bottom device.

[0004] However, in existing technologies, because the lifting force is located at the bottom of the gate, the wire rope and drum assembly driving the gate must be submerged in water for extended periods. This working environment makes the wire rope highly susceptible to corrosion and surface roughening, leading to decreased strength and even breakage. This not only severely shortens the service life of the lifting components but also forces management units to frequently perform costly underwater maintenance and replacement operations. Furthermore, if maintenance is not timely, the corroded wire rope is at risk of breaking during gate opening and closing, posing a significant threat to the safe operation of the sluice gate. Summary of the Invention

[0005] One objective of this application is to provide a bottom lifting device for a horizontal gate, which can solve the problem that the underwater steel wire rope driving the gate is prone to rust and breakage due to water immersion.

[0006] This application discloses a bottom lifting device for a horizontal gate, which includes: a flat steel gate 1, a gate bottom connector or bottom lifting lug 2, a steel bar 3, a pulley assembly 4, a platform-type hoist 5, and a steel wire rope 6. The bottom connector or bottom lifting lug 2 of the gate is fixedly installed at the bottom of the flat steel gate 1; The steel bar 3 is located on one side of the planar steel gate 1. The bottom end of the steel bar 3 is connected to the bottom connector or bottom lifting lug 2 of the gate, and the top end of the steel bar 3 is connected to the pulley assembly 4. The length of the steel bar 3 is greater than the design maximum water level depth of the inland river, so that when the planar steel gate 1 is in the closed state, the connection between the wire rope 6 and the pulley assembly 4 is above the water surface, so as to avoid the wire rope 6 being submerged in water as much as possible.

[0007] The platform-type hoist 5 is located above the gate and is connected to the pulley assembly 4 via the wire rope 6. The pulley assembly 4 drives the steel bar 3 and the flat steel gate 1 to rise and fall.

[0008] In a preferred embodiment, the bottom connector or bottom lug 2 of the gate is hinged to the bottom end of the steel bar 3 and is axially limited.

[0009] In a preferred embodiment, there are two steel bars 3, and the top of the steel bars 3 is slidably connected to and axially limited by the pulley assembly 4.

[0010] In a preferred embodiment, the platform-type gate hoist 5 is equipped with a drum, and the wire rope 6 is wound around the drum and pulls the pulley assembly 4 to move up and down with the movement of the planar steel gate 1.

[0011] In a preferred embodiment, a zinc block is provided on the underwater surface of the steel rod 3. The zinc block is fixed to the steel rod 3 by a conductive connection and is used to prevent corrosion of the steel rod 3.

[0012] In a preferred embodiment, the zinc block is welded or bolted to the steel rod 3.

[0013] In a preferred embodiment, the zinc block is fixed to the steel rod 3 near the bottom lug 2 via a conductive connection.

[0014] In a preferred embodiment, the steel bar 3 adopts a segmented structure, comprising at least two bar sections, with adjacent bar sections being detachably connected by a connecting sleeve or flange.

[0015] In a preferred embodiment, an elastic buffer is provided at the connection between the steel bar 3 and the pulley assembly 4.

[0016] In a preferred embodiment, the elastic buffer is a disc spring or a rubber pad.

[0017] In the embodiments of this application, a steel bar is used as an intermediate force transmission component to connect the bottom lifting lug of the gate to the water pulley assembly. The length of the steel bar is limited to be greater than the design maximum water level depth of the inland river, so that the connection node between the pulley assembly and the wire rope is always above the water surface. This completely changes the stress state of the wire rope in the traditional lifting device of the gate, which is immersed in water for a long time. It effectively avoids the risk of corrosion, roughness and breakage of the wire rope caused by long-term underwater operation, and solves the problems of difficult maintenance and high replacement cost of underwater wire rope. At the same time, using a rigid steel bar instead of a flexible wire rope as the underwater force transmission medium makes the gate opening and closing force system more clear and reasonable, improves the stability and safety of the device operation, significantly reduces the later operation and maintenance cost and extends the overall service life of the lifting device.

[0018] Furthermore, by using bolts to hinge and limit the bottom connector of the gate to the bottom end of the steel bar, the necessary rotational freedom can be given to the connection while ensuring rigid force transmission, so as to adapt to the changes in the motion trajectory of the lifting and tilting gate during the lifting and tilting process. Moreover, the bolt connection method facilitates subsequent disassembly and maintenance.

[0019] Furthermore, by setting two steel bars and slidingly connecting their tops to the pulley assembly, a dual-point balanced lifting structure can be constructed to ensure that the force on both sides of the gate is uniform, preventing the gate from tilting or getting stuck during the lifting process. At the same time, the upper connection design effectively resolves the additional bending moment generated by the rigid rods during the movement, ensuring the smooth operation of the transmission system.

[0020] Furthermore, by using the platform-type hoist drum to wind the wire rope and pulley assembly to move with the gate, the power can be accurately transmitted from the hoist room to the underwater gate. The mature hoisting mechanism, in conjunction with the pulley group, can increase force or change direction, ensuring the smoothness and controllability of the gate lifting and lowering operation.

[0021] Furthermore, by setting conductively connected zinc blocks on the surface of the underwater portion of the steel rod, the principle of electrochemical corrosion (sacrificial anode cathodic protection) can be used to make the zinc blocks preferentially oxidize and corrode over the steel rod, thereby effectively inhibiting the corrosion process of the steel rod and its connecting parts, which are the core load-bearing components, and significantly extending the service life of the underwater metal components.

[0022] Furthermore, by welding or bolting the zinc block to the steel rod, a tight and stable electrical connection circuit can be formed between the zinc block and the steel substrate, reducing contact resistance, ensuring the continuous and effective transmission of cathodic protection current, and preventing the zinc block from falling off under the impact of water flow.

[0023] Furthermore, by placing zinc blocks near the bottom lifting lugs of the steel bar, key anti-corrosion protection can be provided for this critical connection area with stress concentration and complex structure, preventing connection failure due to localized corrosion and ensuring the structural safety of the weakest link of the gate.

[0024] Furthermore, by designing the steel bar as a segmented, detachable structure that includes connecting sleeves or flanges, the problem of space constraints during the transportation and on-site installation of ultra-long steel bars can be solved. Moreover, when the bar is partially damaged, only specific sections need to be replaced instead of the entire bar, which greatly reduces the cost of maintenance materials and the difficulty of the operation.

[0025] Furthermore, by setting an elastic buffer at the connection between the steel bar and the pulley assembly, the inertial impact load generated during the start-up and braking of the hoist can be effectively absorbed, eliminating the instantaneous peak tension that may be caused by the rigid connection, preventing weld cracking or bolt shearing, and protecting the structural integrity of the transmission chain.

[0026] Furthermore, by selecting disc springs or rubber pads as elastic buffers, their high stiffness and high damping mechanical properties can be utilized to provide efficient energy absorption and vibration attenuation within a limited installation space, adapting to the working conditions required for lifting heavy gates.

[0027] The various technical features disclosed in the above-described invention, the various technical features disclosed in the following embodiments and examples, and the various technical features disclosed in the accompanying drawings can be freely combined to form various new technical solutions (all of which should be considered as having been recorded in this specification), unless such a combination of technical features is technically infeasible. For example, in one example, feature A+B+C is disclosed, and in another example, feature A+B+D+E is disclosed. Features C and D are equivalent technical means that serve the same function, and technically only one needs to be used; it is impossible to use both simultaneously. Feature E can be technically combined with feature C. Therefore, the solution A+B+C+D should not be considered as having been recorded because it is technically infeasible, while the solution A+B+C+E should be considered as having been recorded. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the bottom lifting device of a lifting gate in the fully open state according to an embodiment of this application; Figure 2 This is a schematic diagram of the bottom lifting device of a sliding gate in the fully closed state according to an embodiment of this application. Detailed Implementation

[0029] In the following description, many technical details are presented to help the reader better understand this application. However, those skilled in the art will understand that the technical solutions claimed in this application can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0030] Example 1 This embodiment provides a bottom lifting device for a horizontal gate, designed to solve the problems of corrosion and breakage of steel wire ropes caused by long-term immersion in water in traditional devices. Figure 1 and Figure 2 As shown, the device mainly consists of a planar steel gate 1, a gate bottom connector 2, a steel bar 3, a pulley assembly 4, a platform-type hoist 5, and a steel wire rope 6. Figure 1 and Figure 2 In the figure, H1 is the elevation of the gate bottom plate, H2 is the elevation of the gate bottom sill, H3 is the elevation of the top of the gate side rail, and H4 is the elevation of the hoist platform.

[0031] In the overall arrangement of this embodiment, a planar steel gate 1 is installed in the gate slot to control water flow. Gate bottom connectors 2 are fixedly installed on both sides of the gate's bottom. These connectors are made of high-strength steel lifting lugs and are securely installed on the gate's bottom crossbeam by welding or bolting. To replace the traditional easily corroded underwater steel wire rope, this embodiment includes a rigid steel rod 3 on each side of the gate. The steel rod 3 serves as the main force transmission component; its bottom end is connected to the gate bottom connector 2, and its top end extends above the water surface to connect with the pulley assembly 4.

[0032] Regarding the dimensions of the steel bar 3, its length is a key parameter in this embodiment. Specifically, the length of the steel bar 3 is designed to be greater than the maximum design water depth of the inland river. For example, if the design water depth of the inland river is H, then the length L of the steel bar 3 is set to at least 1.1H. This design ensures that when the planar steel gate 1 is in a fully closed state (i.e., submerged in water), the top of the steel bar 3 and the pulley assembly 4 connected to it remain above the water surface. Therefore, the wire rope 6 connecting the pulley assembly 4 and the upper hoist is always in a dry environment above the water surface, thus completely avoiding the wire rope being immersed in water and solving the corrosion problem in traditional technologies.

[0033] The cross-section of steel bar 3 can be circular, elliptical, square, rectangular, etc. If it is square or rectangular, it is best to have chamfered corners on all four sides. The diameter of steel bar 3 should match the weight of the planar steel gate 1. Planar steel gates 1 of different weights can be equipped with steel bars 3 of different diameters, thereby saving costs while ensuring safety.

[0034] Regarding the connection details, the bottom connector 2 of the gate is hinged to the bottom end of the steel rod 3 via a high-strength bolt pin. To ensure the reliability of the connection, a cotter pin or a lock nut is provided at the end of the pin for limiting and fixing, preventing it from falling off during long-term vibration. This hinged connection allows the steel rod 3 to deflect at a certain angle relative to the gate, to adapt to the trajectory change of the lifting gate from vertical to horizontal during the lifting and lowering process.

[0035] The working principle of the device is as follows: The platform-type hoist 5 is installed in the hoist room above the gate, and a steel wire rope 6 is wound on its drum. The steel wire rope 6 hangs downward and passes over the movable pulley in the pulley assembly 4. When the gate needs to be opened, the platform-type hoist 5 is started, the drum rotates to wind up the steel wire rope 6, and pulls the pulley assembly 4 upward. Since the pulley assembly 4 is connected to the steel bar 3, the steel bar 3 rises accordingly, and directly pulls the bottom connecting piece 2 of the gate through the hinge point at the bottom, thereby driving the flat steel gate 1 to rise along the gate slot. When the gate needs to be closed, the hoist rotates in the opposite direction to release the steel wire rope, and the gate, under its own weight, drives the pulley assembly 4 to descend through the steel bar 3 until the gate is closed.

[0036] Example 2 Based on Example 1, this embodiment optimizes the structure of steel bar 3, adding anti-corrosion function and a segmented structure for easy transportation.

[0037] Considering that although steel rod 3 is more corrosion-resistant than steel wire rope, it still faces the risk of electrochemical corrosion when immersed in water for a long time, especially in the stress concentration area connected to the bottom lifting lug. Therefore, in this embodiment, a zinc block is placed on the underwater surface of the steel rod 3. Specifically, the zinc block is installed on the steel rod 3 near the bottom connector 2. During installation, the anti-rust paint or oxide layer on the surface of this part of the steel rod 3 is first removed to expose the metal substrate. Then, the zinc block is tightly fixed to the steel rod 3 by welding or conductive bolts (e.g., metal bolts) to ensure a good conductive path is formed between the two. Utilizing the principle of sacrificial anode cathodic protection in electrochemistry, in the water medium, the zinc block, as the anode, will preferentially undergo oxidation corrosion over the steel rod 3, which acts as the cathode, thereby effectively protecting the core load-bearing component, the steel rod 3, and significantly extending its service life and replacement cycle.

[0038] In addition, optionally, to address the transportation and installation difficulties caused by the excessive length of the steel bar 3 in deep-water sluice gates (e.g., exceeding 10 meters), this embodiment adopts a segmented structure. The steel bar 3 consists of two or more sections, with adjacent sections connected by connecting flanges. In practice, flanges are welded to the ends of the upper and lower sections, and the two flanges are fastened together on-site using high-strength bolts. This design not only solves the transportation problem of ultra-long components but also brings convenience in maintenance: when a section of the steel bar 3 (e.g., a section in a region with fluctuating water levels) is damaged or severely corroded, maintenance personnel only need to disassemble and replace the damaged section, without replacing the entire steel bar, significantly reducing maintenance costs.

[0039] Example 3 Based on Embodiment 1 or Embodiment 2, this embodiment further adds an elastic buffer device at the connection point to improve the system's operational stability.

[0040] Since the steel bar 3 is a rigid component, unlike the flexible wire rope, the rigid connection is prone to generating large impact loads at the moment the hoist starts lifting or stops braking, which may cause the weld at the bottom lifting lug to crack or the pin to be damaged. Therefore, in this embodiment, an elastic buffer is provided at the connection between the top of the steel bar 3 and the pulley assembly 4.

[0041] Specifically, the elastic buffer uses a set of disc springs. The disc springs are sleeved on the tie rod connecting the steel bar 3 and the pulley assembly 4, and are located between the load-bearing seat of the pulley assembly and the top nut of the steel bar. When the platform-type gate hoist 5 begins to lift, the wire rope 6 pulls the pulley assembly 4, which first compresses the disc springs. The disc springs undergo elastic deformation, absorbing the peak tension at the moment of startup, and then smoothly transferring the force to the steel bar 3, driving the gate to rise. Similarly, when braking to a stop, the disc springs release their stored energy, buffering the impact of inertia.

[0042] In another alternative embodiment, the elastic buffer can also be a high-strength rubber pad, sandwiched between the connecting flange or connecting lug of the steel rod 3, utilizing the damping properties of the rubber material to dissipate vibration energy. This buffer design effectively protects the structural integrity of the entire rigid transmission chain, preventing fatigue damage caused by hard-connection impacts.

[0043] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. In this application, if it refers to performing an action according to an element, it means performing the action at least according to that element, including two cases: performing the action only according to that element, and performing the action according to that element and other elements. Expressions such as "multiple," "repeatedly," and "various" include two, two times, two kinds, and more than two, more than two times, and more than two kinds.

[0044] This specification includes combinations of various embodiments described herein. Individual references to embodiments (e.g., “one embodiment”, “some embodiments”, or “preferred embodiments”) do not necessarily refer to the same embodiment; however, these embodiments are not mutually exclusive unless indicated to be mutually exclusive or are readily apparent to those skilled in the art. It should be noted that the word “or” is used in a non-exclusive sense throughout this specification unless the context explicitly indicates or requires it.

[0045] All references to this application are considered to be incorporated in their entirety into the disclosure of this application so that they can serve as a basis for modifications if necessary. Furthermore, it should be understood that after reading the contents of this application, those skilled in the art can make various alterations or modifications to this application, and these equivalent forms also fall within the scope of protection claimed in this application.

Claims

1. A bottom lifting device for a horizontal gate, characterized in that, The device includes: a flat steel gate (1), a bottom connector or bottom lifting lug of the gate (2), a steel bar (3), a pulley assembly (4), a platform-type hoist (5), and a steel wire rope (6); The bottom connector or bottom lifting lug (2) of the gate is fixedly installed at the bottom of the flat steel gate (1); The steel rod (3) is located on one side of the planar steel gate (1). The bottom end of the steel rod (3) is connected to the bottom connector or bottom lifting lug (2) of the gate, and the top end of the steel rod (3) is connected to the pulley assembly (4). The length of the steel rod (3) is greater than the design maximum water level depth of the inland river, so that when the planar steel gate (1) is in the closed state, the connection between the wire rope (6) and the pulley assembly (4) is above the water surface, so as to avoid the wire rope (6) being submerged in the water as much as possible. The platform hoist (5) is located above the gate and is connected to the pulley assembly (4) via the wire rope (6). The pulley assembly (4) drives the steel bar (3) and the flat steel gate (1) to rise and fall.

2. The bottom lifting device of the lifting gate according to claim 1, characterized in that, The bottom connector or bottom lug (2) of the gate is hinged to the bottom end of the steel bar (3) and axially limited.

3. The bottom lifting device of the lifting gate according to claim 1, characterized in that, The number of steel bars (3) is two, and the top of the steel bars (3) is slidably connected to the pulley assembly (4) and axially limited.

4. The bottom lifting device of the lifting gate according to claim 1, characterized in that, The platform-type gate hoist (5) is equipped with a drum, and the wire rope (6) is wound on the drum and pulls the pulley assembly (4) to move up and down with the movement of the planar steel gate (1).

5. The bottom lifting device for a horizontal gate according to any one of claims 1-4, characterized in that, The underwater portion of the steel rod (3) is provided with a zinc block, which is fixed to the steel rod (3) by a conductive connection. The zinc block is used to prevent the steel rod (3) from corroding.

6. The bottom lifting device of the lifting gate according to claim 5, characterized in that, The zinc block is welded or bolted to the steel rod (3).

7. The bottom lifting device of the lifting gate according to claim 5, characterized in that, The zinc block is fixed to the steel rod (3) near the bottom lug (2) by means of conductive connection.

8. The bottom lifting device for a horizontal gate according to any one of claims 1-4, characterized in that, The steel bar (3) adopts a segmented structure, including at least two bar sections, and adjacent bar sections are detachably connected by connecting sleeves or flanges.

9. The bottom lifting device for a horizontal gate according to any one of claims 1-4, characterized in that, An elastic buffer is provided at the connection between the steel bar (3) and the pulley assembly (4).

10. The bottom lifting device of the lifting gate according to claim 9, characterized in that, The elastic buffer is a disc spring or a rubber pad.

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