Tail water outlet bulkhead gate system

Abstract

The invention provides a bulkhead gate system for a tail water outlet, which adopts two gate units which are respectively arranged on the side close to a unit and the side close to tail water of the tail water outlet of a power plant; wherein the gate unit close to the unit side is arranged in a one-hole one-door one-machine mode, the gate unit close to the tail water side is arranged in a multi-hole one-door one-machine mode, the function reliability of the tail water bulkhead gate can be remarkably improved through the double-gate structure, and the situation that the gate cannot be closed to stop water can be basically avoided. The tail water outlet bulkhead gate system comprises a first gate unit arranged on the side close to a unit and a second gate unit arranged on the side close to tail water. Wherein the first gate unit comprises a plurality of first gate modules in one-to-one correspondence with water outlet holes of the hydroelectric power plant; the second gate unit comprises a second hoist, second bulkhead gate grooves in one-to-one correspondence with the tail water side hole sites and a plurality of second bulkhead gates.

Description

Technical Field

[0001] The invention relates to a maintenance gate system, in particular to a double gate system for maintenance of tailwater outlet of a hydropower plant, belonging to the technical field of water conservancy and hydropower engineering. Background Art

[0002] Considering the maintenance and protection of the generator set, the power plant of the hydropower project is generally equipped with a tailwater maintenance gate. When the unit is under maintenance, the gate is closed to block water and facilitate personnel to enter the unit; or when the unit is shut down due to super-high floods during the flood season, the gate needs to be closed to block water to protect the unit.

[0003] If there is a problem with the tailwater maintenance gate or the hoisting and closing equipment, such as the gate is not locked securely and washed away by the flood, the gate is stuck in the gate slot when closed, or the hoisting and closing equipment suddenly loses power, the gate cannot close and block water as required to perform its maintenance and protection function, and there is a certain risk of reliability. In addition, in order to save investment costs, power plants generally use a design method in which multiple units share a set of mobile hoists and a small number of gates, which further reduces reliability.

[0004] If the tailwater maintenance gate cannot be closed as needed to block water, the unit cannot be overhauled on time, affecting the power generation efficiency, or the super-high flood during the flood season causes certain damage to the unit, the economic loss may far exceed the investment cost saved. Therefore, it is necessary to design a highly reliable tailwater maintenance gate. Summary of the invention

[0005] In view of this, the present invention provides a tailwater outlet maintenance gate system, which adopts two gate units, which are respectively arranged on the unit side and the tailwater side of the tailwater outlet of the power plant; wherein the gate unit on the unit side is arranged in a one-hole-one-gate-one-machine manner, and the gate unit on the tailwater side is arranged in a multi-hole-one-door-one-machine manner. The double gate structure can significantly improve the functional reliability of the tailwater maintenance gate, and basically avoid the situation where the gate cannot be closed to block water.

[0006] A tailwater outlet inspection gate system comprises: a first gate unit arranged on the unit side and a second gate unit arranged on the tailwater side;

[0007] The first gate unit includes a plurality of first gate modules corresponding to the outlet holes of the hydropower plant; each of the first gate modules includes: a first inspection gate, a first inspection gate slot and a first hoist; the first inspection gate slot is arranged in the corresponding outlet hole for installing the first inspection gate; the first hoist is used to drive the first inspection gate to move up and down along the first inspection gate slot to open or close the gate;

[0008] The second gate unit comprises: a second hoist, a second inspection gate slot corresponding to the tailwater side hole position one by one, and a plurality of second inspection gates; the number of the second inspection gates is less than the number of the second inspection gate slots; the second inspection gate is slidably matched with the second inspection gate slot, and can move up and down along the second inspection gate slot under the drive of the second hoist to realize opening or closing;

[0009] A second inspection gate locking beam is provided at the top of the door slot of each of the second inspection gates, which is used to lock the position of the second inspection gate.

[0010] As a preferred embodiment of the present invention: in the first gate module, a sealing cover is provided at the top of the first inspection gate slot to close the opening at the top of the first inspection gate slot.

[0011] As a preferred embodiment of the present invention: the sealing cover also serves as a frame of the first hoist.

[0012] As a preferred embodiment of the present invention: the first gate hoist is a hydraulic gate hoist.

[0013] As a preferred embodiment of the present invention: a moving unit is provided above the top of the first gate hoist, which is used for lifting and moving the first gate hoist, the sealing cover and the first inspection gate.

[0014] As a preferred embodiment of the present invention: the second inspection gate is a stoplog gate, comprising a plurality of gate plates arranged in a height direction;

[0015] When the second inspection gate is in an open state, a plurality of gate plates are respectively locked on the second inspection gate locking beams of different second inspection gate slots;

[0016] The second gate hoist is a mobile gate hoist, which can drive the first inspection gate to move horizontally into a gate slot of another second inspection gate.

[0017] As a preferred embodiment of the present invention: the water seal of the first inspection gate is arranged on its downstream side, and the water seal of the second inspection gate is arranged on its upstream side.

[0018] As a preferred embodiment of the present invention, it also includes a water filling and water pressure unit; the water filling and water pressure unit includes: a water filling pipe group and an air filling and air filling pipe group;

[0019] The water filling pipe group is used to fill water in the area inside the first inspection gate before opening the first inspection gate to achieve horizontal pressure; and to fill water in the area between the first inspection gate and the second inspection gate before opening the second inspection gate to achieve horizontal pressure;

[0020] The filling and exhaust pipe group is used for exhausting air during the water filling process of each area and for inflating air after draining water.

[0021] As a preferred embodiment of the present invention: the water filling pipe group includes: an air filling branch pipe A, an air filling branch pipe B and an air filling main pipe;

[0022] The inflation branch pipe A and the inflation branch pipe B provided with a bypass valve are respectively connected to the inflation main pipe; the inflation main pipe is connected to the tail water on the tail water side; wherein the inflation branch pipe A is connected to the inner area of ​​the first inspection gate, and the inflation branch pipe B is connected to the area between the first inspection gate and the second inspection gate;

[0023] The charging and exhaust pipe group includes two independent charging and exhaust pipes, namely charging and exhaust pipe A and charging and exhaust pipe B; one end of the charging and exhaust pipe A is connected to the inner area of ​​the first inspection gate, and the other end is connected to the outside world; the charging and exhaust pipe B is connected to the area between the first inspection gate and the second inspection gate, and the other end is connected to the outside world.

[0024] As a preferred embodiment of the present invention: the connecting end of the inflation / exhaust pipe A and the inner area of ​​the first inspection gate is located above the gate slot of the first inspection gate.

[0025] Beneficial effects:

[0026] (1) In the tailwater outlet maintenance gate system of the present invention, a set of tailwater maintenance gates (i.e., the first gate unit) is added on the unit side, which can increase the protection capability of the tailwater maintenance gate system during unit maintenance, reduce the risks caused by accidents, and increase the reliability of the tailwater gate system.

[0027] (2) In the tailwater outlet inspection gate system of the present invention, the added first gate unit is in the form of a sealing cover, which can be set inside the powerhouse. There is no need to add additional civil engineering structures for arranging the gate slot of the first inspection gate. It is possible to add an inspection gate without increasing the amount of additional civil engineering work and maintaining the original overall design dimensions of the powerhouse.

[0028] (3) In the tailwater outlet maintenance gate system of the present invention, when the gate is closed for maintenance, the first gate unit or the second gate unit can be closed separately; or the first gate unit and the second gate unit can be closed at the same time to ensure reliability; thus, the gate system is flexible to use.

[0029] (4) In the tailwater outlet inspection gate system of the present invention, a moving unit is provided above the top of the first hoist, so as to facilitate the installation, inspection and maintenance of the first hoist, the sealing cover and the first inspection gate.

[0030] (5) In the tailwater outlet inspection gate system of the present invention, a water filling and water pressure unit is provided to perform water filling and water pressure filling before the gate is opened, thereby ensuring that the first inspection gate and the second inspection gate are opened with less friction resistance.

[0031] (6) In the tailwater outlet inspection gate system of the present invention, the filling and exhaust pipe is located at the upper position of the gate slot of the first inspection gate, and an air valve is provided on the sealing cover. Both can play the function of filling and exhausting at the same time, and the filling and exhausting reliability is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the tailwater outlet inspection gate system of the present invention;

[0033] Figure 2 It is a schematic diagram of the arrangement of the water-charging and water-pressure unit in the tailwater outlet inspection gate system of the present invention.

[0034] Among them: 1-the second inspection gate, 2-the second inspection gate slot, 3-the second inspection gate locking beam, 4-the mobile hoist track, 5-the second hoist, 6-the first inspection gate, 7-the first inspection gate slot, 8-the sealing cover, 9-the first hoist, 10-the mobile unit, 11-the filling and exhaust pipe group, 111-the filling and exhaust pipe A, 112-the filling and exhaust pipe B, 12-the water filling pipe group, 121-the water filling branch pipe A, 122-the water filling branch pipe B, 123-the water filling main pipe. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0036] Embodiment 1:

[0037] This embodiment provides a hydropower plant tailwater outlet maintenance gate system, which adopts a two-gate design and can effectively improve the functional reliability of the tailwater maintenance gate.

[0038] like Figure 1 As shown, the tailwater outlet maintenance gate system includes: two gate units, which are a first gate unit arranged on the unit side and a second gate unit arranged on the tailwater side in sequence along the water flow direction.

[0039] The hydroelectric power plant has several water outlet holes. In order to ensure the reliability of the gate on the unit side, the first gate unit adopts a one-hole-one-gate-one-machine layout, that is, each water outlet hole in the hydroelectric power plant is provided with a gate slot, a flat gate and a hydraulic gate opening and closing machine; based on this, the first gate unit on the unit side includes several first gate modules corresponding to the water outlet holes one by one, and each first gate module includes: a first maintenance gate 6, a first maintenance gate slot 7 and a first gate opening and closing machine 9; wherein the first maintenance gate slot 7 is arranged in the corresponding water outlet hole for installing the first maintenance gate 6; due to the structural layout requirements of the plant, the top elevation of the first maintenance gate slot 7 is lower than the tailwater level. In order to prevent water from gushing out from the top of the first maintenance gate slot 7 and flooding the plant, a sealing cover 8 is provided at the top of the first maintenance gate slot 7 to close the top opening of the first maintenance gate slot 7.

[0040] The first inspection gate 6 is installed in the first inspection gate slot 7. The first inspection gate 6 is slidably matched with the first inspection gate slot 7, and can move up and down along the first inspection gate slot 7 to open or close the door. By design, when the first inspection gate 6 is in a fully open state (that is, when the first inspection gate 6 slides upward along the first inspection gate slot 7 to the maximum stroke position), the bottom of the first inspection gate 6 is higher than the elevation of the lintel of the first inspection gate slot 7, so that the first inspection gate 6 does not affect the flow of water when it is fully open.

[0041] As an example, two opposite lateral sides of the first inspection gate slot 7 are provided with tracks for enabling the first inspection gate 6 to slide up and down.

[0042] The sealing cover 8 also serves as a frame of the first gate hoist 9 (ie, the first gate hoist 9 is supported on the sealing cover 8); the first gate hoist 9 is used to drive the first inspection gate 6 to move up and down along the first inspection gate slot 7.

[0043] As an example, the first gate hoist 9 is a hydraulic gate hoist, a cylinder end of which is fixed on the sealing cover 8, and a telescopic end is connected to the first inspection gate 6, and the first inspection gate 6 is driven to move up and down by the telescopic end.

[0044] The stroke of the first inspection gate 6 can be set so that when the first inspection gate 6 moves upward to the maximum stroke (that is, the first inspection gate 6 is in a fully open state), the top of the first inspection gate 6 maintains a certain safety distance from the sealing cover 8. Figure 1 The diagram shows the position of the first inspection gate 6 when it is in a fully open state (ie, at the highest position).

[0045] A moving unit 10 is provided above the top of the first gate hoist 9, which is used to move the first gate hoist 9, the sealing cover 8 and the first inspection gate 6 to the maintenance area when the first gate hoist 9, the sealing cover 8 and the first inspection gate 6 need to be repaired and maintained (at this time, the connection between the first gate hoist 9 and the sealing cover 8, and the first gate hoist 9 and the first inspection gate 6 needs to be disconnected).

[0046] As an example, the mobile unit 10 is a mobile electric hoist; a mobile guide rail of the mobile electric hoist is provided above the top of the first hoist 9. At the same time, the mobile unit 10 is also used for hoisting the first inspection gate slot 7, the first hoist 9, the sealing cover 8 and the first inspection gate 6 during installation.

[0047] As an example, the first inspection gate 6 is a flat gate, and its panel and water stop are both arranged on the downstream side, that is, the side facing the tailwater side.

[0048] The second gate unit is arranged in a multi-hole one-gate-one-machine manner, that is, a gate slot (i.e., the second maintenance gate slot 2) is set for each hole on the tailwater side, and multiple second maintenance gate slots 2 share one maintenance gate; all second maintenance gate slots 2 share one hoist. For example: there are 12 independent hole positions on the tailwater side, and a second maintenance gate slot 2 is set in each hole position. Every four hole positions form a group and share one second maintenance gate 1; all second maintenance gate slots 2 share one hoist, so that the 12 hole positions are equipped with 12 second maintenance gate slots 2, three second maintenance gates 1 and one second hoist 5; when in use, the second hoist 5 is used to move the second maintenance gate 1 to the hole position to be closed (it can be understood that a track is set at the top of the 12 second maintenance gate slots 2, and the second hoist 5 moves along the track to move the second maintenance gate 1 to the position where the door needs to be closed).

[0049] Based on this, the second gate unit includes: a second hoist 5, second inspection gate slots 2 corresponding to the tailwater side hole positions one by one, and a plurality of second inspection gates 1, the number of second inspection gates 1 is less than the number of second inspection gate slots 2; the tailwater side hole positions are divided into a plurality of groups, each group has more than one hole position, and the second inspection gate slots 2 in each group share a second inspection gate 1; all second inspection gate slots 2 share a second hoist 5; the second inspection gate 1 is slidably matched with the second inspection gate slot 2, and can move up and down along the second inspection gate slot 2 under the drive of the second hoist 5 to open or close the door.

[0050] As an example, the second inspection gate 1 adopts a stacked beam gate, including a plurality of gate plates, and the plurality of gate plates are arranged in a height direction to form the second inspection gate 1. A second inspection gate locking beam 3 is provided at the top of each second inspection gate slot 2 (a locking mechanism is provided on the locking beam 3, and a conventional inspection gate locking mechanism can be used), which is used to lock the second inspection gate 1 in the current position when the second inspection gate 1 is in an open state (the first gate unit adopts a one-hole-one-door-one-machine arrangement, and each first inspection gate 6 has a first opening and closing machine 9, and the first opening and closing machine 9 is always connected to the corresponding first inspection gate 6, so there is no need to lock the position of the first inspection gate 6; and the second gate unit adopts a multi-hole-one-door-one-machine arrangement. Initially, each stacked gate of the stacked beam door is locked to the top of the second inspection gate slot 2 in the corresponding group through the locking beam 3; if the four second inspection gate slots 2 share a stacked beam door with three stacked gates, when there is no need to close the door, the three stacked gates are respectively locked on the locking beams 3 at the top of any three second inspection gate slots 2).

[0051] In view of the fact that multiple second inspection gate slots 2 share one second opening and closing machine 5, the second opening and closing machine 5 is a mobile opening and closing machine. In addition to being able to drive the first inspection gate 6 to move up and down along the second inspection gate slot 2, it can also further drive the first inspection gate 6 to move horizontally into another second inspection gate slot 2.

[0052] Since a set of tailwater maintenance gates (i.e., the first gate unit) is added on the unit side, the protection capability of the tailwater maintenance gate system during unit maintenance can be increased, the risk caused by accidents can be reduced, and the reliability of the tailwater gate system can be increased. In addition, the first gate unit adopts the form of a sealing cover, which can be set inside the plant, without adding additional civil engineering structures for arranging the first maintenance gate slot 7, so that an inspection gate can be added without increasing the amount of additional civil engineering and maintaining the original overall design size of the plant.

[0053] The opening and closing process of the first gate module in the first gate unit is as follows:

[0054] The first gate module is operated by a hydraulic hoist (i.e., the first hoist 9), and the opening and closing of the first gate module is operated in still water. When the first inspection gate 6 needs to be opened, the water pressure is first filled. When the water pressure difference before and after the first inspection gate 6 is less than or equal to the design value A, the first hoist 9 is used to lift the first inspection gate 6, and the first inspection gate 6 reaches the upper limit position (such as Figure 1 When the first inspection gate 6 is in the position shown in the figure, the first hoist 9 stops running, and the first inspection gate 6 is opened at this time; when the first inspection gate 6 needs to be closed, the first hoist 9 is used to move the first inspection gate 6 downward in a static water state to close the door; when the first inspection gate 6 is fully closed, the first hoist 9 stops running.

[0055] The opening and closing process of the second gate unit is as follows:

[0056] The tailwater stopgate on the tailwater side, i.e., the opening and closing of the second gate unit, is operated in still water, and the second inspection gate 1 is usually stored at the position of the second inspection gate locking beam 3. When the second inspection gate 1 needs to be closed, the gate is closed in still water, and the second inspection gate 1 is first lifted by the second hoist 5, and the second inspection gate locking beam 3 is removed (such as by a linear motor or a hydraulic push rod translationally pushed open), and the second inspection gate 1 is moved to the position of the second inspection gate slot 2 that needs to be closed by the second hoist 5 (when the second inspection gate 1 is a stopgate gate and each gate plate is locked in different positions of the second inspection gate slot 2, each gate plate is moved to the position of the second inspection gate slot 2 that needs to be closed in turn), until the second inspection gate 1 is fully closed. When the second inspection gate 1 needs to be opened, the water pressure is first filled. When the water pressure difference before and after the second inspection gate 1 is less than or equal to the design value B, the gates of the second inspection gate 1 are lifted in turn and locked on the corresponding second inspection gate locking beam 3.

[0057] During closed-door maintenance, the first gate unit or the second gate unit can be closed individually; the first gate unit and the second gate unit can also be closed at the same time to ensure reliability.

[0058] Embodiment 2:

[0059] On the basis of the above implementation 1, further, in order to ensure that the first inspection gate 6 and the second inspection gate 1 can be opened under a smaller friction resistance, the gate system also includes a water-filling and water-pressurizing unit.

[0060] The horizontal pressure unit includes a water filling pipe group 12 and an air filling pipe group 11; Figure 2 As shown, the two gate units divide the area between the unit side and the tailwater side into four parts, namely, area A within the first gate unit, area B above the first maintenance gate 6 where the first gate unit is located (in this embodiment, the panel water seal of the first maintenance gate 6 is located on the tailwater side, so area B is connected to area A in most cases), area C between the first gate unit and the second gate unit, and area D outside the second gate unit. The first maintenance gate 6 is used to isolate area A (including area B) and area C, and the second maintenance gate 1 is used to isolate area C and area D.

[0061] The water filling pipe group is used to fill area A, area B and area C with water at different stages, and the exhaust pipe group is used to exhaust the air when area A, area B and area C are filled with water (when filling with water, area AB or area C is a closed area. If the air cannot be discharged, when the gas is compressed to a certain small volume, a gas explosion will occur, so exhaust is required) or drain (areas A, area B and area C are equipped with drainage pipes corresponding to them, which are not shown in the figure); when closing the door for maintenance, if only the first maintenance gate 6 is closed, areas A and B need to be drained; if both the first maintenance gate 6 and the second maintenance gate 1 are closed, areas A, B and C need to be drained.

[0062] The water filling pipe group 12 adopts the form of two branch pipes sharing one main pipe, based on this, the water filling pipe group 12 includes an inflation branch pipe A121, an inflation branch pipe B122 and an inflation main pipe 123; the inflation branch pipe A121 and the inflation branch pipe B122 are respectively connected to the inflation main pipe 123, the inflation main pipe 123 is connected to the tail water on the tail water side, and the inflation branch pipe A121 and the inflation branch pipe B122 are both provided with a bypass valve; the inflation branch pipe A121 is arranged on the inner side of the first maintenance gate 6 (towards the side of the unit) for filling water into areas A and B; the inflation branch pipe B122 is arranged in area C for filling water into area C.

[0063] The charging and exhaust pipe group 11 includes two independent charging and exhaust pipes, namely, charging and exhaust pipe A111 and charging and exhaust pipe B112; the charging and exhaust pipe group must be two independent charging and exhaust pipes, the reason is that: if two branch pipes share one main pipe, when the first gate unit is closed alone, when the tail water level exceeds the elevation of the horizontal section of the charging and exhaust pipe, the tail water will bypass the gate through the charging and exhaust pipe and enter areas B and A from area C, posing risks to the staff and equipment behind the first gate unit.

[0064] One end of the charging and exhaust pipe A111 is located at the upper position of the first inspection gate slot 7, and is connected to the B area and the A area, and the other end is connected to the outside world; an air valve is provided on the sealing cover 8, and both can play the function of charging and exhausting at the same time. When the water level rises to a position above the inlet of the charging and exhaust pipe A111, the air valve on the sealing cover 8 serves as an auxiliary exhaust device to discharge the remaining gas. One end of the charging and exhaust pipe B112 is connected to the C area, near the side of the second inspection gate lintel unit, and the other end is connected to the outside world.

[0065] When it is necessary to open the first inspection gate 6, it is first charged and pressurized. The charging and leveling process is: open the bypass valve on the charging branch pipe A121, fill water into areas A and B through the charging branch pipe A121, and the water seal of the first inspection gate 6 is set on its downstream side (so that areas A and B are connected, and water and air are not allowed to pass between areas B and C). During the water filling process, the gas in areas A and B is discharged from the charging and exhaust pipe A111; after the pressure in areas A and C is balanced, the first inspection gate 6 can be opened under smaller friction resistance.

[0066] When it is necessary to open the second inspection gate 1, it is firstly charged and pressurized. The charging and pressurizing process is as follows: open the bypass valve on the charging branch pipe B122, fill the C area with water through the charging branch pipe B122, and the water seal of the stopcock gate (i.e. the second inspection gate 1) is set on the upstream side (so that water and air cannot pass between the C area and the D area). During the water filling process, the gas is discharged from the charging and exhaust pipe B112; after the pressure in the C area and the D area is balanced, the second inspection gate 1 can be opened with less friction resistance.

[0067] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A tailwater outlet inspection gate system, characterized in that: include: The first gate unit is arranged on the unit side and the second gate unit is arranged on the tailwater side; The first gate unit comprises a plurality of first gate modules corresponding to the water outlet holes of the hydropower plant; each of the first gate modules comprises: a first inspection gate (6), a first inspection gate slot (7) and a first hoist (9); the first inspection gate slot (7) is arranged in the corresponding water outlet hole and is used to install the first inspection gate (6); the first hoist (9) is used to drive the first inspection gate (6) to move up and down along the first inspection gate slot (7) to open or close the gate; The second gate unit comprises: a second hoist (5), second inspection gate slots (2) corresponding one-to-one to the tailwater side hole positions, and a plurality of second inspection gates (1); the number of the second inspection gates (1) is less than the number of the second inspection gate slots (2); the second inspection gate (1) is slidably matched with the second inspection gate slot (2), and can move up and down along the second inspection gate slot (2) under the drive of the second hoist (5) to realize opening or closing; A second inspection gate locking beam (3) is provided at the top of each second inspection gate slot (2) for locking the position of the second inspection gate (1).

2. The tailwater outlet inspection gate system according to claim 1, characterized in that: In the first gate module, a sealing cover (8) is provided at the top of the first inspection gate slot (7) to close the top opening of the first inspection gate slot (7).

3. The tailwater outlet inspection gate system according to claim 2, characterized in that: The sealing cover (8) also serves as a frame of the first hoist (9).

4. The tailwater outlet inspection gate system according to claim 1, 2 or 3, characterized in that: The first gate hoist (9) is a hydraulic gate hoist.

5. The tailwater outlet inspection gate system according to claim 1, 2 or 3, characterized in that: A moving unit (10) is provided above the top of the first gate hoist (9) for lifting and moving the first gate hoist (9), the sealing cover (8) and the first inspection gate (6).

6. The tailwater outlet inspection gate system according to claim 1, characterized in that: The second inspection gate (1) is a stoplog gate, comprising a plurality of gate plates arranged in a height direction; When the second inspection gate (1) is in an open state, a plurality of gate plates are respectively locked on second inspection gate locking beams (3) of different second inspection gate slots (2); The second gate hoist (5) is a mobile gate hoist capable of driving the first inspection gate (6) to move laterally into another second inspection gate slot (2).

7. The tailwater outlet inspection gate system according to claim 1, characterized in that: The water seal of the first inspection gate (6) is arranged on its downstream side, and the water seal of the second inspection gate (1) is arranged on its upstream side.

8. The tailwater outlet inspection gate system according to claim 1, characterized in that: It also includes a water filling and water pressure unit; the water filling and water pressure unit includes: a water filling pipe group (12) and an air filling and air filling pipe group (11); The water filling pipe group (12) is used to fill water into the area inside the first inspection gate (6) before opening the first inspection gate (6) to achieve horizontal pressure after filling; and to fill water into the area between the first inspection gate (6) and the second inspection gate (1) before opening the second inspection gate (1) to achieve horizontal pressure after filling; The inflation and exhaust pipe group (11) is used for exhausting air during the water filling process of each area and for inflating air after water discharge.

9. The tailwater outlet inspection gate system according to claim 8, characterized in that: The water filling pipe group comprises: an air filling branch pipe A (121), an air filling branch pipe B (122) and an air filling main pipe (123); The inflation branch pipe A (121) and the inflation branch pipe B (122) provided with bypass valves are respectively connected to the inflation main pipe (123); the inflation main pipe (123) is connected to the tail water on the tail water side; wherein the inflation branch pipe A (121) is connected to the inner area of ​​the first inspection gate (6), and the inflation branch pipe B (122) is connected to the area between the first inspection gate (6) and the second inspection gate (1); The charging and exhaust pipe group comprises two independent charging and exhaust pipes, namely, a charging and exhaust pipe A (111) and a charging and exhaust pipe B (112); one end of the charging and exhaust pipe A (111) is connected to the inner area of ​​the first inspection gate (6), and the other end is connected to the outside; the charging and exhaust pipe B (112) is connected to the area between the first inspection gate (6) and the second inspection gate (1), and the other end is connected to the outside.

10. The tailwater outlet inspection gate system according to claim 9, characterized in that: The connecting end of the inflation / exhaust pipe A (111) and the inner area of ​​the first inspection gate (6) is located above the first inspection gate slot (7).

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