Layered water intake gate and gate mounting method

Abstract

The invention provides a layered water intake gate and a gate mounting method.The layered water intake gate is mounted in a mounting gate groove and comprises a driving unit, a switching unit and at least two gate units; the driving unit comprises a driving device and a transmission shaft; the transmission shaft comprises transmission shaft sections, and each gate unit is connected with at least one transmission shaft section; the transmission shaft section is provided with a shifting gear; the gate unit comprises a gate body and a driven mechanism, and the driven mechanism is provided with a driven gear; the switching unit comprises a control part and a lifting part; the lifting part is respectively connected with the at least one control part and the shifting gear of the at least one transmission shaft section; and the shifting gear can be engaged with or disengaged from the driven gear under the control of the switching unit. The switching mechanism is additionally arranged, the arrangement of a driving transmission structure is optimized, and the structural reliability, the control flexibility and the maintenance convenience of the gate are improved.

Description

Technical Field

[0001] This invention relates to the field of stratified water intake in power plants, and more specifically, to a stratified water intake gate and a gate installation method. Background Technology

[0002] Layered water intake technology is a key measure in water conservancy and hydropower projects to regulate the temperature of downstream water and protect the downstream ecological environment. Its core lies in selectively extracting water from suitable water layers based on the differences in water temperature and water quality at different water depths.

[0003] However, traditional tiered intake gates typically employ an independent underwater drive mechanism for each gate stage, such as directly driving individual gates with hydraulic cylinders or motors. While this design allows for independent control of each gate stage, in practical applications, the need for separate hydraulic pump stations or submersible motors for each underwater drive mechanism, along with associated sealing devices and protective structures, significantly increases system complexity and manufacturing costs. Secondly, the drive mechanism is constantly submerged in the underwater environment, and the extensive underwater cabling reduces reliability and makes maintenance difficult. Failures necessitate interrupting intake operations for underwater repairs, resulting in high operating costs. Furthermore, existing technologies face challenges such as complex drive transmission mechanisms, large space requirements, and stringent requirements on the gate slot structure. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a tiered water intake gate and a gate installation method, which aims to improve the gate's structural reliability, control flexibility, and ease of maintenance by adding a switching mechanism and optimizing the drive transmission structure.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides a tiered water intake gate, wherein the tiered water intake gate is installed in an installation gate slot and includes a drive unit, a switching unit, and at least two gate units;

[0007] The drive unit includes a drive device and a drive shaft; the drive shaft includes drive shaft segments, and each gate unit is connected to at least one drive shaft segment; the drive shaft segment is provided with a shift gear.

[0008] The gate unit includes a gate body and a driven mechanism, wherein the driven mechanism is provided with a driven gear;

[0009] The switching unit includes a control unit and a lifting unit; the lifting unit is connected to at least one of the control units and at least one of the shift gears of the transmission shaft segment; the shift gear can engage or disengage with the driven gear under the control of the switching unit.

[0010] Preferably, it further includes an installation device disposed at the entrance of the installation gate slot for fixing the gate unit.

[0011] Preferably, the connection between the installation device and the gate unit is a fixed connection installation method consisting of one or more combinations of mechanical clamping devices, pin insertion structures, and bolt structures.

[0012] Preferably, the gate unit further includes a gate frame; adjacent gate units are connected through the gate frame; and the drive shaft segments of adjacent gate units are connected through a drive shaft connection part.

[0013] Preferably, the gate unit connection includes an upper connecting flange and a lower connecting flange;

[0014] The drive shaft connection includes a splined shaft and an inner splined sleeve;

[0015] The drive shaft segment is equipped with a universal coupling.

[0016] Preferably, the gate unit further includes a driven shaft, a gate body rotating shaft, a worm gear, and a worm; the gate body is connected to the gate body rotating shaft, at least one end of the gate body rotating shaft is connected to the gate frame, at least one end of the gate body rotating shaft is connected to the worm gear, the worm gear meshes with the worm, the worm is connected to the driven shaft, and the driven gear is sleeved on the driven shaft.

[0017] Preferably, the driven shaft is provided with a driven shaft bevel gear, the worm is provided with a worm bevel gear, and the driven shaft bevel gear meshes with the worm bevel gear.

[0018] Preferably, the drive shaft segment is provided with a reset member, and the shift gear can engage or disengage with the driven gear under the control of the switching unit and the reset member.

[0019] A second aspect of the present invention provides a method for installing a tiered water intake gate, comprising the following steps:

[0020] In step S1, the gate unit is placed into the mounting slot and fixed at the entrance of the mounting slot by the mounting device, serving as the top gate unit;

[0021] In step S2, the next-level gate unit is placed above the current top-level gate unit as a new top-level gate unit. Adjacent gate units are connected and fastened through the gate unit connecting part. The drive shaft segments of adjacent gate units are connected through the drive shaft connecting part so that the adjacent drive shaft segments can rotate synchronously. After the connection is completed, a gate unit assembly is formed.

[0022] The gate unit assembly is suspended by a gantry crane. After the installation device is removed, the gate unit assembly is lowered so that the new top-level gate unit is located at the entrance of the installation slot and fixed by the installation device.

[0023] In step S3, step S2 is repeated until all gate units are connected to form a complete gate unit assembly.

[0024] In step S4, after disconnecting the installation device from the top gate unit, the gate unit assembly is placed into the bottom of the installation slot using a hoisting gantry crane, and the connecting section of the drive unit is connected to the drive shaft section of the top gate unit.

[0025] Preferably, in step S2, the gate unit connection part includes an upper connecting flange and a lower connecting flange, and the drive shaft connection part includes a splined shaft and an inner splined sleeve; adjacent gate units are connected through the upper connecting flange and the lower connecting flange and fastened with bolts, and the drive shaft segments of adjacent gate units are connected through the splined shaft and the inner splined sleeve, so that the adjacent drive shaft segments can rotate synchronously.

[0026] Preferably, the connection between the installation device and the gate unit is a fixed connection installation method consisting of one or more combinations of mechanical clamping devices, pin insertion structures, and bolt structures.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The present invention forms a centralized transmission scheme through the special structural settings of each unit, which can selectively engage and drive a designated gate unit. This enables a single power source to control any single or multiple gates as needed, significantly simplifying the system structure, avoiding the deployment of electromechanical equipment underwater, thereby reducing maintenance frequency and cost, and improving the flexibility of system control.

[0029] 2. Specifically, the present invention controls the corresponding shift gear and driven gear to mesh or reset and disengage through the control unit and the lifting unit, thereby realizing the adjustment of the transmission relationship of the corresponding gate unit. The structure is simple and the motion logic of the components is clear. It can save the layout space of the transmission mechanism and ensure the stability and reliability of the switching process.

[0030] 3. The method provided by the present invention can ensure accurate and reliable connection between adjacent gate units and between adjacent transmission shafts by assembling multi-level gate units at the entrance of the installation gate slot and then uniformly sinking them into place, thereby enhancing structural stability and transmission reliability.

[0031] 4. This invention further achieves drive force transmission to complete the opening and closing of the gate leaf by setting up structures such as a gate frame, gate body rotating shaft, worm gear, and worm, which is simple in structure and reliable and effective. This invention also enhances the connection stability between adjacent gate units and adjacent transmission shafts through the structural design of upper connecting flange, lower connecting flange, splined shaft, inner splined sleeve, and universal coupling. Attached Figure Description

[0032] Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0033] Figure 1 This is a front view schematic diagram of the stratified water intake gate in the normal operating state in Examples 1 and 2;

[0034] Figure 2 This is a side view of the stratified water intake gate in Examples 1 and 2 under normal operating conditions.

[0035] Figure 3 This is a top view of the gate unit described in Embodiment 1;

[0036] Figure 4 for Figure 1 A magnified view of part I;

[0037] Figure 5 for Figure 3 A schematic diagram of the cross-sectional structure along the cc direction;

[0038] Figure 6 This is a schematic diagram of the first process in Example 2;

[0039] Figure 7 This is a schematic diagram of the second process in Example 2.

[0040] The diagram shows:

[0041] 1-Installation door slot; 11-Installation device;

[0042] 2-Gate unit; 20-Gate unit assembly; 21-Gate frame; 211-Gate unit connecting part; 2111-Upper connecting flange; 2112-Lower connecting flange; 22-Gate body; 23-Driven mechanism; 231-Driven gear; 232-Driven shaft; 233-Gate body rotating shaft; 234-Worm gear; 235-Worm; 236-Worm bevel gear; 237-Worm support; 238-Driven shaft bevel gear;

[0043] 3-Drive unit; 31-Drive device; 32-Connecting section; 33-Drive shaft; 331-Drive shaft segment; 332-Drive shaft connecting part; 3321-Splined shaft; 3322-Inner splined sleeve; 333-Shift gear; 334-Reset component; 335-Universal coupling; 336-Shift fork;

[0044] 4-Switching unit; 41-Control unit; 42-Lifting unit. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0046] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0047] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, all directional indications in this application (such as up, down, left, right, front, back, bottom, etc.) are only used to explain the relative positional relationships and movements between components in a specific orientation (as shown in the figures). If the specific orientation changes, the directional indication will also change accordingly.

[0048] Example 1

[0049] To address the technical deficiencies in existing technologies and improve the structural reliability, control flexibility, and maintenance convenience of gates, this embodiment provides a tiered water intake gate. For example... Figures 1-5As shown, the tiered water intake gate provided in this embodiment is installed in the mounting slot 1 and includes a gate unit 2, a drive unit 3, and a switching unit 4. In this embodiment, the cross-section of the mounting slot 1 is U-shaped, with guide grooves on both sides, allowing the gate unit 2 to be embedded in the guide grooves and move up and down along them. The related structure of the mounting slot is also existing technology and can be adjusted according to the type and functional requirements of the gate; this embodiment will not elaborate further. The gate unit 2 is located in the mounting slot 1. The drive unit 3 can control the opening and closing of the gate unit 2, allowing it to flow water or close to block water. The switching unit 4 can control the connection or disconnection between the drive unit 3 and the gate unit 2.

[0050] Furthermore, the mounting slot 1 is also provided with a mounting device 11 for fixing the gate unit 2 at the entrance of the mounting slot 1, so as to facilitate installation and maintenance.

[0051] Specifically, when assembling or disassembling gate unit 2, a gantry crane is used to move gate unit 2 to the entrance of the gate slot 1. Gate unit 2 is then fixedly connected to the mounting device 11, allowing it to be temporarily fixed at the entrance of the gate slot. This facilitates operations such as connecting or disassembling gate units 2 and connecting or disassembling drive unit 3. It should be noted that the fixed connection between the mounting device 11 and gate unit 2 can be achieved using one or more combinations of mechanical clamping devices, pin insertion structures, and bolt structures, enhancing the stability of the fixed connection.

[0052] The drive unit 3 includes a drive device 31, a connecting section 32, and a transmission shaft 33. The drive device 31 is located at the top of the mounting slot 1 and is connected to the transmission shaft 33 through the connecting section 32, thereby driving the transmission shaft 33 to rotate. The drive device 31 is a motor, but other drive devices in the prior art can also be used as needed in other embodiments. Regarding the specific structure of the transmission shaft 33, in this embodiment, the transmission shaft 33 includes several transmission shaft segments 331, and each gate unit 2 is connected to at least one transmission shaft segment 331. A shift gear 333 is also provided on the transmission shaft segment 331 for realizing the transmission connection between the drive unit 3 and the gate unit 2 under the control of the switching unit 4. A reset member 334 is also provided on the transmission shaft segment 331 for realizing the transmission disconnection between the drive unit 3 and the gate unit 2 under the control of the switching unit 4. The reset member 334 can be an elastic component, such as a return spring, or other structures.

[0053] A drive shaft connecting part 332 is provided on the drive shaft segment 331 for connecting adjacent drive shaft segments 331 to form a drive shaft 33. Further, the drive shaft connecting part 332 includes a splined shaft 3321 and an inner splined sleeve 3322. The splined shaft 3321 and the inner splined sleeve 3322 are respectively disposed at both ends of the drive shaft segment 331. Adjacent drive shaft segments 331 are connected and fixed together by the splined shaft 3321 and the inner splined sleeve 3322, thereby improving the connection stability and transmission efficiency of the drive shaft 33. The drive shaft segment 331 is also provided with a universal coupling 335. The universal coupling 335 can dynamically compensate for installation errors or shaft deflection during operation, such as the tilting of a gate due to foundation settlement, while still maintaining torque transmission efficiency, avoiding the risk of tooth surface damage, vibration, or even breakage caused by misalignment of the shafts in traditional rigid connections.

[0054] The specific structure of gate unit 2 is described below. The structure of a single gate unit 2 includes a gate frame 21, a gate body 22, and a driven mechanism 23. The driven mechanism 23 receives driving force and transmits control to close or adjust the opening of the gate body 22. The gate body 22 is a valve leaf, which can be adjusted to other water-blocking structures as needed in other embodiments. The driven mechanism 23 specifically includes a driven gear 231, a driven shaft 232, a gate body rotating shaft 233, a worm gear 234, and a worm 235. Gate unit 2 is connected to mounting slot 1 via gate frame 21. Specifically, gate frame 21 can be embedded in the guide groove of mounting slot 1 and move along the guide groove. The gate body 22 is fixedly connected to the gate body rotating shaft 233. At least one end of the gate body rotating shaft 233 is connected to the gate frame 21, and at least one end of the gate body rotating shaft 233 is fixedly connected to the worm gear 234. The worm gear 234 meshes with the worm 235, and the worm 235 is connected to the driven shaft 232. The driven gear 231 is sleeved on the driven shaft 232. The shift gear 333 provided in the corresponding transmission shaft segment 331 can mesh with or disengage from the driven gear 231 under the control of the switching unit 4 and the reset member 334.

[0055] The connection method of the gate unit 2 allows the shift gear 333 of the transmission shaft segment 331 to mesh with the driven gear 231 under the control of the switching unit 4. This enables the transmission shaft segment 331 to drive the driven shaft 232 to rotate via the driven gear 231, which in turn drives the worm gear 235 to rotate. The worm gear 235 then drives the worm wheel 234 to rotate, which in turn drives the gate body rotating shaft 233 to rotate, causing the gate body 22 to rotate for opening and closing. In this embodiment, the gate unit 2 includes multiple vertically arranged gate body rotating shafts 233, each connected to a gate body 22. The gate body 22 is a guide vane valve. Driven by the worm wheel 234, the gate body rotating shaft 233 drives the connected gate body 22 to rotate. However, in other embodiments, the gate body rotating shaft 233 can be set horizontally or at a specific angle. Each gate unit 2 is connected to at least one drive shaft segment 331. In terms of the connection method, the drive shaft segment 331 can be directly set inside the gate frame 21 of the gate unit 2, which enhances the integrity of the gate unit 2 and facilitates the engagement and disengagement of the shift gear 333 and the driven gear 231.

[0056] In this embodiment, three gate units 2 are set to form a gate unit assembly 20, which are all installed in the mounting gate slot 1. Adjacent gate units 2 are fixedly connected by a gate frame 21, and the drive shafts 33 of adjacent gate units 2 are fixedly connected. In other embodiments, the number of gate units 2 can be adjusted according to the actual stratified water intake requirements. The gate unit 2 is also provided with a gate unit connecting part 211, and adjacent gate units 2 are connected through the gate unit connecting part 211. Further, the gate unit connecting part 211 includes an upper connecting flange 2111 and a lower connecting flange 2112. The upper connecting flange 2111 is located on the upper part of the gate unit 2, and the lower connecting flange 2112 is located on the lower part of the gate unit 2. Adjacent gate units 2 are connected and fixed through the upper connecting flange 2111 and the lower connecting flange 2112, thereby improving the stability of the gate unit 2 assembly. Furthermore, the driven shaft 232 and worm gear 235 of the same gate unit 2 are arranged perpendicularly. The driven shaft 232 is equipped with a driven shaft bevel gear 238, and the worm gear 235 is equipped with a worm bevel gear 236. The driven shaft bevel gear 238 meshes with the worm bevel gear 236. This arrangement can maintain transmission stability while further saving the arrangement space of the gate unit 2. Furthermore, to enhance the stability of the driven mechanism 23, the worm gear 235 is connected to the gate frame 21 through a worm gear support 237.

[0057] The switching unit 4 includes a control unit 41 and a lifting unit 42. The lifting unit 42 is connected to at least one control unit 41 and at least one drive shaft segment 331 via a shift gear 333. In this embodiment, the specific number of control units 41 and lifting units 42 is the same as the number of gate units 2. Each gate unit 2 is configured with one control unit 41 and one lifting unit 42 via a shift gear 333. However, in other embodiments, other numbers and connection relationships can be set according to different control requirements. In this embodiment, the control unit 41 is a gear shift lever, and the lifting unit 42 is a steel wire rope. Regarding the connection between the lifting unit 42 and the shift gear 333, the shift gear 333 is provided with a shift fork 336. Specifically, the fork of the shift fork 336 engages in the annular groove provided in the shift gear 333. One end of the lifting unit 42 is connected to the control unit 41, and the other end is connected to the shift fork 336. When the control unit 41 pulls the lifting unit 42 upward, the shift fork 336 is driven by the traction force to move the shift gear 333 axially along the transmission shaft segment 331, compressing the reset member 334, so that the shift gear 333 meshes with the driven gear 231. When the traction force on the lifting unit 42 is removed by the control unit 41, the shift fork 336 is unloaded and, under the action of the reset member 334, drives the shift gear 333 to move axially, so that the shift gear 333 disengages from the driven gear 231. This connection method can reliably achieve the switching between engagement and disengagement of power transmission while the drive shaft segment 331 rotates normally. However, other structures can also be adopted in other embodiments, such as using a rigid linkage mechanism instead of a wire rope to transmit tension; or using a rotatable cam instead of a shift fork 336, setting the profile of the cam to contact the shift gear 333, so that when the lifting part 42 drives the cam to rotate, its profile curve squeezes the shift gear 333 to slide axially, thereby achieving the switching between engagement and disengagement.

[0058] The operating principle of this embodiment is described in detail below. When it is necessary to drive a certain level of gate unit 2, by operating the corresponding control unit 41, the corresponding lifting unit 42 can pull the shift gear 333 to mesh with the corresponding driven gear 231. The driving force of the driving device 31 can be transmitted to the transmission shaft 33 through the connecting section 32. The transmission shaft 33 further drives the gate body rotating shaft 233 to rotate in sequence through the driven shaft 232, worm 235, and worm wheel 234, so that the gate body 22 closes or adjusts the opening degree of the gate body 22. When it is not necessary to drive the gate unit 2, the force on the corresponding shift gear 333 can be released by the control unit 41. Under the action of the reset member 334, the shift gear 333 disengages from the driven gear 231, and the driving force of the driving device 31 is no longer transmitted to the driven gear 231.

[0059] Example 2

[0060] like Figure 6-7As shown, this embodiment provides a method for installing a tiered water intake gate. The specific structure of the tiered water intake gate is as described in Embodiment 1, and will not be repeated here. The method provided in this embodiment specifically includes the following steps:

[0061] In step S1, the gate unit 2 is placed into the mounting slot 1 and fixed at the entrance of the mounting slot 1 by the mounting device 11, serving as the top gate unit 2.

[0062] In step S2, the next-level gate unit 2 is placed above the current top-level gate unit 2 as a new top-level gate unit 2. Adjacent gate units 2 are connected and secured through the gate unit connecting part 211. The drive shaft segments 331 of adjacent gate units 2 are connected through the drive shaft connecting part 332 so that adjacent drive shaft segments 331 can rotate synchronously. After the connection is completed, a gate unit assembly 20 is formed. The gate unit assembly 20 is suspended by a hoisting gantry crane, the installation device 11 is released, and the hoisting gantry crane lowers the gate unit assembly 20 until the new top-level gate unit 2 is located at the entrance of the installation gate slot 1, and is fixed by the installation device 11.

[0063] Furthermore, the gate unit connection part 211 includes an upper connecting flange 2111 and a lower connecting flange 2112, and the drive shaft connection part 332 includes a splined shaft 3321 and an inner splined sleeve 3322. The drive shaft segment 331 is also provided with a universal coupling 335. In step S2, adjacent gate units 2 are connected by the upper connecting flange 2111 and the lower connecting flange 2112 and fastened with bolts. The drive shaft segments 331 of adjacent gate units 2 are connected by the splined shaft 3321 and the inner splined sleeve 3322, so that the adjacent drive shaft segments 331 can rotate synchronously.

[0064] In step S3, step S2 is repeated until all gate units 2 are connected to form a complete gate unit assembly 20.

[0065] In step S4, after disconnecting the installation device 11 from the top gate unit 2 with the help of the hoisting gantry crane, the gate unit assembly 20 is placed at the bottom of the installation gate slot 1, and the connecting section 32 of the drive unit 3 is connected to the drive shaft section 331 of the top gate unit 2.

[0066] Furthermore, in steps S1, S2, S3, and S4, the gate unit 2 is moved using a hoisting gantry crane. Currently, the hoisting gantry cranes for tiered intake gates in power plants generally have a lifting capacity exceeding 150 tons, while the self-weight of most tiered intake gates (guide vane valves) is less than 10 tons. Therefore, they can accommodate the assembly of up to 15 gate units. The fixed connection between the installation device 11 and the gate unit 2 can be achieved by using one or more combinations of fixed connection installation methods, such as mechanical clamping devices, pin insertion structures, and bolt structures.

[0067] The specific embodiments of the present invention have been described above. Based on the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of the present invention.

Claims

1. A tiered water intake gate, wherein the tiered water intake gate is installed in an installation gate slot (1), characterized in that, Includes a drive unit (3), a switching unit (4), and at least two gate units (2); The drive unit (3) includes a drive device (31) and a drive shaft (33); the drive shaft (33) includes a drive shaft segment (331), and each gate unit (2) is connected to at least one drive shaft segment (331); the drive shaft segment (331) is provided with a shift gear (333). The gate unit (2) includes a gate body (22) and a driven mechanism (23), wherein the driven mechanism (23) is provided with a driven gear (231). The switching unit (4) includes a control unit (41) and a lifting unit (42); the lifting unit (42) is connected to at least one of the control units (41) and at least one of the transmission shaft segments (331) via gears (333); the gears (333) can engage or disengage with the driven gear (231) under the control of the switching unit (4).

2. A tiered water intake gate according to claim 1, characterized in that, It also includes an installation device (11) disposed at the entrance of the installation slot (1) for fixing the gate unit (2).

3. A tiered water intake gate according to claim 2, characterized in that, The connection between the installation device (11) and the gate unit (2) is a fixed connection installation method consisting of one or more combinations of mechanical clamping device, pin shaft insertion structure, and bolt structure.

4. A tiered water intake gate according to claim 1, characterized in that, The gate unit (2) also includes a gate frame (21); adjacent gate units (2) are connected through the gate frame (21); the drive shaft segments (331) of adjacent gate units (2) are connected through the drive shaft connecting part (332); the gate unit (2) is also provided with a gate unit connecting part (211), and adjacent gate units (2) are connected through the gate unit connecting part (211).

5. A tiered water intake gate according to claim 4, characterized in that, The gate unit (2) further includes a driven shaft (232), a gate body rotating shaft (233), a worm gear (234), and a worm (235); the gate body (22) is connected to the gate body rotating shaft (233), at least one end of the gate body rotating shaft (233) is connected to the gate frame (21), at least one end of the gate body rotating shaft (233) is connected to the worm gear (234), the worm gear (234) meshes with the worm (235), the worm (235) is connected to the driven shaft (232), and the driven gear (231) is sleeved on the driven shaft (232).

6. The method for installing a tiered water intake gate according to claim 5, characterized in that, The driven shaft (232) is provided with a driven shaft bevel gear (238), and the worm (235) is provided with a worm bevel gear (236). The driven shaft bevel gear (238) meshes with the worm bevel gear (236).

7. A tiered water intake gate according to claim 4, characterized in that, The gate unit connection part (211) includes an upper connecting flange (2111) and a lower connecting flange (2112). The drive shaft connection part (332) includes a splined shaft (3321) and an inner splined sleeve (3322). The drive shaft segment (331) is equipped with a universal coupling (335).

8. A tiered water intake gate according to claim 1, characterized in that, The drive shaft segment (331) is provided with a reset member (334), and the shift gear (333) can engage or disengage with the driven gear (231) under the control of the switching unit (4) and the reset member (334).

9. A method for installing a tiered water intake gate, characterized in that, Includes the following steps: In step S1, the gate unit (2) is placed into the mounting gate slot (1) and fixed at the entrance of the mounting gate slot (1) by the mounting device (11) as the top gate unit (2). In step S2, the next-level gate unit (2) is placed above the current top-level gate unit (2) as a new top-level gate unit (2). The adjacent gate units (2) are connected and fastened through the gate unit connecting part (211). The drive shaft segments (331) of the adjacent gate units (2) are connected through the drive shaft connecting part (332) so that the adjacent drive shaft segments (331) can rotate synchronously. After the connection is completed, a gate unit assembly (20) is formed. The gate unit assembly (20) is suspended by a hoisting gantry crane. After the installation device (11) is removed, the gate unit assembly (20) is lowered so that the new top gate unit (2) is located at the entrance of the installation slot (1) and fixed by the installation device (11). In step S3, step S2 is repeated until all gate units (2) are connected to form a complete gate unit assembly (20). In step S4, after disconnecting the installation device (11) from the top gate unit (2), the gate unit assembly (20) is placed into the bottom of the installation gate slot (1) by means of a hoisting gantry crane, and the connecting section (32) of the drive unit (3) is connected to the drive shaft section (331) of the top gate unit (2).

10. The method for installing a tiered water intake gate according to claim 9, characterized in that, In step S2, the gate unit connecting part (211) includes an upper connecting flange (2111) and a lower connecting flange (2112), and the drive shaft connecting part (332) includes a splined shaft (3321) and an inner splined sleeve (3322). Adjacent gate units (2) are connected through the upper connecting flange (2111) and the lower connecting flange (2112) and fastened with bolts. The drive shaft segments (331) of adjacent gate units (2) are connected through the splined shaft (3321) and the inner splined sleeve (3322) so that the adjacent drive shaft segments (331) can rotate synchronously.

11. The method for installing a tiered water intake gate according to claim 9, characterized in that, The connection between the installation device (11) and the gate unit (2) is a fixed connection installation method consisting of one or more combinations of mechanical clamping device, pin shaft insertion structure, and bolt structure.

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