Waterfall power generation equipment with impurity removing function

Abstract

The invention relates to the technical field of hydroelectric power generation equipment, in particular to waterfall power generation equipment with a sundry removing function, which comprises a bracket, a supporting seat, a water collecting tank, a filtering assembly and a box body, a plurality of acting modules are arranged at the top in the support, a power generation module is arranged at the bottom in the support, a base is arranged at the bottom of the support, and a water injection funnel is arranged at the axis of the top of the support; the supporting seat is arranged at the top of the bracket; the water collecting tank is arranged at the tops of the two supporting seats; the filtering assembly is arranged in the water collecting tank; the number of the box bodies is two, the two box bodies are symmetrically arranged with the center line of the water collecting tank as the axis, a closable opening is formed in one side of each box body, the top of each box body communicates with the interior of the water collecting tank, and the box bodies are used for discharging impurities in the water collecting tank; impurities in water flow can be effectively intercepted and removed, the abrasion and blockage risks of the water turbine and other key components are reduced, equipment operation is smoother, and the downtime caused by maintenance is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy power generation equipment, in particular to a waterfall power generation equipment with a debris removal function. Background Art

[0002] As a clean and renewable way of utilizing energy, hydropower generation has been widely studied and applied around the world. This technology mainly relies on the potential energy in the water body, and converts the kinetic energy of water into electrical energy through the rotation of the turbine. According to different geographical and hydrological conditions, the design and construction of hydropower stations are diverse, including water diversion, water storage, tidal, and pump storage. Among them, waterfalls, as a special form of water energy in nature, have become an important object of hydropower development due to their high drop and concentrated water flow characteristics. However, in the development and operation of waterfall hydropower generation, there are a series of technical and economic problems that need to be solved. First of all, since the environment where the waterfall is located is usually more complex, the water flow carries a lot of debris such as silt, branches, and ice. If these debris enter the power generation equipment, such as turbines and generators, with the water flow, they may cause wear or blockage on the precision parts of the equipment, affect the power generation efficiency, and even cause equipment damage and increase maintenance costs. Summary of the invention

[0003] In view of this, the present invention aims at the deficiencies of the prior art and proposes a waterfall power generation device with a debris removal function, aiming to solve at least one of the problems raised by the above background technology.

[0004] The present invention provides a waterfall power generation device with a debris removal function, comprising: a bracket, the bracket is vertically arranged, a plurality of working modules are arranged at the top of the bracket, a power generation module is arranged at the bottom of the bracket, a base is arranged at the bottom of the bracket, and a water injection funnel is arranged at the axis line of the top of the bracket;

[0005] A support seat, the support seat is arranged at the top of the bracket, two support seats are arranged symmetrically with the axis of the bracket as the axis, and the bottoms of the two support seats are fixedly connected to the top of the bracket;

[0006] A water collecting tank, the water collecting tank is arranged on the top of the two support seats, the tops of the two support seats are fixedly connected to the bottom of the water collecting tank, the bottom of the water collecting tank is provided with a first funnel corresponding to the water injection funnel, the top of the first funnel is connected to the water collecting tank, and the bottom of the water collecting tank is connected to the water injection funnel;

[0007] A filter assembly, the filter assembly being disposed inside the water collection tank;

[0008] A box body, wherein two boxes are provided, and the two boxes are symmetrically arranged with the center line of the water collecting tank as the axis, a closable opening is provided on one side of the box body, and the top of the box body is connected with the interior of the water collecting tank, and the box body is used to discharge impurities in the water collecting tank.

[0009] In some embodiments, the support base is a cubic frame structure, and two reinforcing ribs are cross-arranged inside the support base.

[0010] In some embodiments, the transverse cross-section of the water collection tank is a circular structure.

[0011] In some embodiments, a bell mouth is provided at the top of the water collecting tank, the bottom of the bell mouth is fixedly connected to the side wall of the top of the water collecting tank, and the outer diameter of the bottom of the bell mouth matches the outer diameter of the top of the water collecting tank.

[0012] In some embodiments, a first opening is provided on a side wall of the bell mouth, and a bottom of the first opening is on the same horizontal line as a top of the water collecting tank.

[0013] In some embodiments, the filter assembly comprises:

[0014] Two electric slide rails are provided, the two electric slide rails are symmetrically arranged on the inner wall of the water collecting tank with the axis of the water collecting tank as the axis, the mounting ends of the two electric slide rails are respectively fixedly connected to the inner wall of the water collecting tank, and the two electric slide rails are vertically arranged;

[0015] A filter plate, the outer diameter of which matches the inner diameter of the water collecting tank, and the side walls of which are respectively fixedly connected to the sliding ends of the two electric slide rails.

[0016] In some embodiments, the filter assembly further comprises a filter cover, the axial cross-section of the filter cover is a semicircular structure, the filter cover is arranged corresponding to the first funnel, and the filter cover is arranged on the top of the first funnel.

[0017] In some embodiments, the outer diameter of the filter housing is greater than the outer diameter of the first funnel top.

[0018] In some embodiments, the box body is correspondingly arranged between the filter cover and the side wall of the water collection tank, and an inclined plate is arranged in the box body. The inclined plate is arranged in the water collection tank away from the closable opening side, the width of the inclined plate is the same as the internal width of the box body, and the side wall of the inclined plate is fixedly connected to the inner wall of the box body.

[0019] In some embodiments, the closable opening comprises:

[0020] An electric rotating shaft, both ends of which are rotatably connected to the inner wall of the box;

[0021] A sealing plate, wherein the electric rotating shaft passes through the sealing plate transversely, and the electric rotating shaft is fixedly connected to the sealing plate, and the outer diameter of the sealing plate matches the inner diameter of the box body.

[0022] Compared with the prior art, the beneficial effect of the present invention is that by effectively intercepting and removing impurities in the water flow, such as silt, branches, etc., the risk of wear and blockage of these impurities on the turbine and other key components is reduced. This means that the equipment can run more smoothly, reduce downtime caused by maintenance, and thus improve the overall power generation efficiency. Specifically, when the water flows through the filter assembly, most of the large particles of impurities are intercepted to prevent them from entering between the turbine blades, avoiding the turbine speed drop or stoppage caused by foreign objects getting stuck. In addition, the design of the filtration system also takes into account the uniform distribution of the water flow, ensuring that the turbine can receive a stable and continuous water flow, thereby maximizing its work capacity. The debris removal function reduces the need for cleaning and maintenance inside the power generation equipment, because most of the impurities that may cause damage are filtered out before entering the work module. This not only reduces direct maintenance costs, but also reduces indirect costs caused by frequent maintenance, such as labor costs and spare parts inventory costs. For example, without an effective filtration system, a large amount of silt and debris may accumulate inside the turbine, which requires regular shutdown for cleaning, which is not only time-consuming but also costly. With this filtration system, maintenance cycles can be significantly extended, reducing downtime and related maintenance work, while also reducing the frequency and cost of replacing parts. Reducing the ingress of impurities means that the wear rate of turbines and other mechanical parts is slowed down, extending the service life of the equipment. In the long run, this will reduce the need to replace equipment, further reducing investment costs. Turbines and other key components are one of the most expensive parts of power generation equipment, and their durability directly affects the economic benefits of the entire project. By reducing the impact of impurities, these components can remain in good working condition for a longer period of time, reducing the need for premature replacement due to excessive wear or damage. The bell-mouth design helps to collect more water when the water flow is large, while maintaining a certain water level height when the water flow is small, ensuring that the power generation equipment can operate stably in different seasons and climatic conditions. This design enhances the equipment's adaptability to changes in the natural environment and improves the stability of energy output. Whether it is dry or rainy seasons, the equipment is able to adjust its working state according to the actual available water volume to ensure continuous and stable power output. This is particularly important for areas that rely on seasonal water sources, as it ensures that a reliable power supply can be generated even when water resources are limited.

[0023] The foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure.

[0024] Other features and aspects of the present disclosure will become more apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A front view of a waterfall power generation device with a debris removal function provided by an embodiment of the present invention;

[0027] Figure 2 A front structural cross-sectional view of a water collection tank of a waterfall power generation device with a debris removal function provided by an embodiment of the present invention;

[0028] Figure 3 A side structural cross-sectional view of a waterfall power generation device box body with a debris removal function provided by an embodiment of the present invention;

[0029] Figure 4 A top view of a water collection tank of a waterfall power generation device with a debris removal function provided in an embodiment of the present invention.

[0030] Among them: 1. bracket; 2. working module; 3. power generation module; 4. base; 5. water injection funnel; 6. support seat; 7. water collecting tank; 8. first funnel; 9. filter assembly; 10. box body; 11. closable opening; 12. reinforcing ribs; 13. bell mouth; 14. first opening; 15. electric slide rail; 16. filter plate; 17. filter cover; 18. inclined plate; 19. electric rotating shaft; 20. sealing plate. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0034] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] As mentioned in the background technology, hydroelectric power generation, as a clean and renewable energy utilization method, has been widely studied and applied worldwide. This technology mainly relies on the potential energy in the water body, and converts the kinetic energy of water into electrical energy through the rotation of the turbine. According to different geographical and hydrological conditions, the design and construction of hydropower stations are diverse, including water diversion, water storage, tidal and pump storage. Among them, waterfalls, as a special form of water energy in nature, have become an important object of hydropower development due to their high drop and concentrated water flow characteristics. However, in the development and operation of waterfall hydropower generation, there are a series of technical and economic problems that need to be solved. First, because the environment where the waterfall is located is usually more complex, the water flow carries more debris such as mud, branches, and ice. If these debris enter the power generation equipment, such as turbines and generators, with the water flow, they may cause wear or blockage to the precision parts of the equipment, affect the power generation efficiency, and even cause equipment damage and increase maintenance costs.

[0036] In order to improve the above problems, the present application proposes a waterfall power generation equipment with a debris removal function, which effectively intercepts and removes impurities in the water flow, such as mud, branches, etc., to reduce the risk of wear and blockage of these debris on the turbine and other key components. This means that the equipment can run more smoothly, reduce downtime caused by maintenance, and thus improve the overall power generation efficiency. Specifically, when the water flows through the filter assembly, most of the large particles of impurities are intercepted to prevent them from entering between the turbine blades, avoiding the turbine speed from decreasing or stopping due to foreign objects getting stuck. In addition, the design of the filtration system also takes into account the uniform distribution of the water flow, ensuring that the turbine can receive a stable and continuous water flow, thereby maximizing its work capacity. The debris removal function reduces the need for cleaning and maintenance inside the power generation equipment, because most of the impurities that may cause damage are filtered out before entering the working module. This not only reduces direct maintenance costs, but also reduces indirect costs caused by frequent maintenance, such as labor costs and spare parts inventory costs. For example, without an effective filtration system, a large amount of silt and debris may accumulate inside the turbine, which requires regular downtime for cleaning, which is not only time-consuming but also costly. With this filtration system, the maintenance cycle can be significantly extended, reducing downtime and related maintenance work, while also reducing the frequency and cost of replacing parts. Reducing the ingress of impurities means that the wear rate of the turbine and other mechanical parts is slowed down, extending the service life of the equipment. In the long run, this will reduce the need to replace equipment, further reducing investment costs. Turbines and other key components are one of the most expensive parts of power generation equipment, and their durability directly affects the economic benefits of the entire project. By reducing the impact of impurities, these components can remain in good working condition for a longer period of time, reducing the need for premature replacement due to excessive wear or damage. The bell-mouth design helps to collect more water when the water flow is large, while maintaining a certain water level height when the water volume is small, ensuring that the power generation equipment can operate stably in different seasons and climatic conditions. This design enhances the equipment's ability to adapt to changes in the natural environment and improves the stability of energy output. Whether it is a drought or rainy season, the equipment is able to adjust its working state according to the actual available water volume to ensure continuous and stable power output. This is particularly important for regions that rely on seasonal water sources, as it ensures a reliable supply of electricity can be generated even when water resources are limited.

[0037] See also Figure 1-4 As shown, a waterfall power generation device with debris removal function according to an embodiment of the present application includes:

[0038] A bracket 1, wherein the bracket 1 is vertically arranged, a plurality of working modules 2 are arranged at the top of the bracket 1, a power generation module 3 is arranged at the bottom of the bracket 1, a base 4 is arranged at the bottom of the bracket 1, and a water injection funnel 5 is arranged at the axis line of the top of the bracket 1;

[0039] A support seat 6, the support seat 6 is arranged on the top of the bracket 1, and two support seats 6 are symmetrically arranged with the axis of the bracket 1 as the axis, and the bottoms of the two support seats 6 are fixedly connected to the top of the bracket 1;

[0040] A water collecting tank 7, wherein the water collecting tank 7 is arranged at the top of the two support seats 6, and the tops of the two support seats 6 are fixedly connected to the bottom of the water collecting tank 7, and a first funnel 8 is arranged at the bottom of the water collecting tank 7 corresponding to the water injection funnel 5, and the top of the first funnel 8 is connected to the water collecting tank 7, and the bottom of the water collecting tank 7 is connected to the water injection funnel 5;

[0041] A filter assembly 9, wherein the filter assembly 9 is disposed inside the water collection tank 7;

[0042] The box body 10 is provided with two boxes, and the two boxes 10 are symmetrically arranged with the center line of the water collecting tank 7 as the axis. A closable opening 11 is provided on one side of the box body 10. The top of the box body 10 is connected with the interior of the water collecting tank 7. The box body 10 is used to discharge impurities in the water collecting tank 7.

[0043] Specifically, the waterfall injects water into the topmost work module to achieve energy input, and then the energy is transferred between the upper and lower adjacent work modules (i.e., repeated work), so that each work module is sequentially input from top to bottom, so that N work modules are all in a work state, wherein: each work module includes multiple containers, each container repeatedly performs energy input and energy transfer (i.e., superimposed work); in each work module, a part of the containers are in a loaded state at the same time to achieve gravity work superposition, and the other part of the containers are in an unloaded state. All work modules are jointly provided with a power generation module, and each work module superimposes its own work (torque work) and sends it to the power generation module for power generation.

[0044] Each container in the working module rotates in one direction to work through a rotating mechanism. Water is injected into the container at the water injection position as energy input, and the container is in a loaded state after energy input; the container rotates downward with the rotating mechanism due to the gravity of the water injected therein; when the container of the upper working module is transferred to the water discharge position, water is released to the container of the lower working module transferred to the water injection position as energy transfer, and the container is in an unloaded state after energy transfer; after energy transfer, the container rotates upward with the rotating mechanism. The container may be a water storage barrel. The rotating mechanism may include a rotating wheel. A water discharge mechanism is provided at the water discharge position to make the container flip and release water; the water discharge mechanism may include a flip baffle to make the container tip over. The transmission mechanism may include a transmission shaft.

[0045] The water storage bucket on the wheel of the working module that is at (or rotated to) the water filling position receives the falling water. Under the gravity of each water storage bucket that is filled with water (basically filled), the wheel rotates, and this water storage bucket rotates downward with the rotation of the wheel. At the same time, the next water storage bucket rotates upward to the water filling position and starts to fill water, and so on. Among them: the water storage bucket on the wheel of the top working module that is at the water filling position receives the waterfall water flowing down through the waterfall guide groove and the water filling funnel; the water storage buckets on the wheels of the remaining working modules that are at the water filling position receive the water flowing from the water receiving funnel above. When the water storage bucket touches the flip baffle with the rotation of the wheel, it will fall over, and the water in the water storage bucket will be released (the water in the water storage bucket is considered to have all flowed out), so the water storage bucket is in an unloaded state and rotates upward with the wheel, and the water in the water storage bucket flows into a water storage bucket in the water filling position on the wheel of the working module below through the water receiving funnel below, and at the same time, the next water storage bucket rotates downward to the flip baffle 55 to start releasing water, and so on; when a water storage bucket on the wheel of the working module rotates one circle, one work or kinetic energy output is completed. The torque generated by the wheels of each working module is superimposed through the gear transmission mechanism, and then output to the generator for power generation after being accelerated by the speed increasing gearbox.

[0046] In some specific embodiments, the support base 6 is a cubic frame structure, and two reinforcing ribs 12 are cross-arranged inside the support base 6 .

[0047] In some specific embodiments, the transverse cross-section of the water collecting tank 7 is a circular structure.

[0048] In some specific embodiments, a bell mouth 13 is provided on the top of the water collecting tank 7 , the bottom of the bell mouth 13 is fixedly connected to the top side wall of the water collecting tank 7 , and the outer diameter of the bottom of the bell mouth 13 matches the outer diameter of the top of the water collecting tank 7 .

[0049] In some specific embodiments, a first opening 14 is provided on a side wall of the bell mouth 13 , and the bottom of the first opening 14 is on the same horizontal line as the top of the water collecting tank 7 .

[0050] In some specific embodiments, the filter assembly 9 includes:

[0051] The electric slide rails 15 are provided with two of them. The two electric slide rails 15 are symmetrically arranged on the inner wall of the water collecting tank 7 with the axis of the water collecting tank 7 as the axis. The mounting ends of the two electric slide rails 15 are respectively fixedly connected to the inner wall of the water collecting tank 7. The two electric slide rails 15 are vertically arranged;

[0052] The filter plate 16 has an outer diameter that matches the inner diameter of the water collecting tank 7 , and side walls of the filter plate 16 are fixedly connected to the sliding ends of the two electric slide rails 15 .

[0053] Specifically, the electric slide rail 15 can drive the filter plate 16 to move upward to the top of the water collection tank 7, and the impurities on the top of the filter plate 16 flow out to the first opening 14 under the impact of water, which can effectively prevent the filter plate 16 from being blocked due to excessive impurities.

[0054] In some specific embodiments, the filter assembly 9 further includes a filter cover 17 , the axial cross-section of the filter cover 17 is a semicircular structure, the filter cover 17 is arranged corresponding to the first funnel 8 , and the filter cover 17 is arranged on the top of the first funnel 8 .

[0055] Specifically, the entire filter cover 17 is placed on the top of the first funnel 8, that is, the filter cover 17 filters the water for the second time.

[0056] In some specific embodiments, the outer diameter of the filter cover 17 is larger than the outer diameter of the top of the first funnel 8 .

[0057] In some specific embodiments, the box body 10 is correspondingly arranged between the filter cover 17 and the side wall of the water collecting tank 7. An inclined plate 18 is arranged in the box body 10. The inclined plate 18 is arranged in the water collecting tank 7 away from the side of the closable opening 11. The width of the inclined plate 18 is the same as the internal width of the box body 10, and the side wall of the inclined plate 18 is fixedly connected to the inner wall of the box body 10.

[0058] In some specific embodiments, the closable opening 11 includes:

[0059] An electric rotating shaft 19, both ends of which are rotatably connected to the inner wall of the box body 10;

[0060] The sealing plate 20 , the electric rotating shaft 19 passes through the sealing plate 20 transversely, and the electric rotating shaft 19 is fixedly connected to the sealing plate 20 , and the outer diameter of the sealing plate 20 matches the inner diameter of the box body 10 .

[0061] Specifically, the impurities filtered by the filter cover 17 flow into the box body 10 , and the box body 10 allows the impurities in the box body 10 to flow out by rotating the sealing plate 20 .

[0062] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A waterfall power generation device with debris removal function, characterized in that: include: A bracket, wherein the bracket is vertically arranged, a plurality of working modules are arranged at the top of the bracket, a power generation module is arranged at the bottom of the bracket, a base is arranged at the bottom of the bracket, and a water injection funnel is arranged at the axis line of the top of the bracket; A support seat, the support seat is arranged at the top of the bracket, two support seats are arranged symmetrically with the axis of the bracket as the axis, and the bottoms of the two support seats are fixedly connected to the top of the bracket; A water collecting tank, the water collecting tank is arranged on the top of the two support seats, the tops of the two support seats are fixedly connected to the bottom of the water collecting tank, the bottom of the water collecting tank is provided with a first funnel corresponding to the water injection funnel, the top of the first funnel is connected to the water collecting tank, and the bottom of the water collecting tank is connected to the water injection funnel; A filter assembly, the filter assembly being disposed inside the water collection tank; A box body, wherein two boxes are provided, and the two boxes are symmetrically arranged with the center line of the water collecting tank as the axis, a closable opening is provided on one side of the box body, and the top of the box body is connected with the interior of the water collecting tank, and the box body is used to discharge impurities in the water collecting tank.

2. The waterfall power generation device with debris removal function according to claim 1 is characterized in that: The support base is a cubic frame structure, and two reinforcing ribs are cross-arranged inside the support base.

3. The waterfall power generation device with debris removal function according to claim 1 is characterized in that: The transverse cross section of the water collecting tank is a circular structure.

4. The waterfall power generation device with debris removal function according to claim 1 is characterized in that: A bell mouth is arranged on the top of the water collecting tank, the bottom of the bell mouth is fixedly connected to the side wall of the top of the water collecting tank, and the outer diameter of the bottom of the bell mouth matches the outer diameter of the top of the water collecting tank.

5. The waterfall power generation device with debris removal function according to claim 4 is characterized in that: A first opening is provided on one side wall of the bell mouth, and the bottom of the first opening is on the same horizontal line as the top of the water collecting tank.

6. The waterfall power generation device with debris removal function according to claim 4, characterized in that: The filter assembly comprises: Two electric slide rails are provided, the two electric slide rails are symmetrically arranged on the inner wall of the water collecting tank with the axis of the water collecting tank as the axis, the mounting ends of the two electric slide rails are respectively fixedly connected to the inner wall of the water collecting tank, and the two electric slide rails are vertically arranged; A filter plate, the outer diameter of which matches the inner diameter of the water collecting tank, and the side walls of which are respectively fixedly connected to the sliding ends of the two electric slide rails.

7. The waterfall power generation device with debris removal function according to claim 6, characterized in that: The filter assembly also includes a filter cover, the axial cross-section of the filter cover is a semicircular structure, the filter cover is arranged corresponding to the first funnel, and the filter cover is arranged on the top of the first funnel.

8. The waterfall power generation device with debris removal function according to claim 7, characterized in that: The outer diameter of the filter cover is greater than the outer diameter of the top of the first funnel.

9. The waterfall power generation device with debris removal function according to claim 7, characterized in that: The box body is correspondingly arranged between the filter cover and the side wall of the water collection tank. An inclined plate is arranged in the box body. The inclined plate is arranged in the water collection tank away from the closable opening side. The width of the inclined plate is the same as the internal width of the box body. The side wall of the inclined plate is fixedly connected to the inner wall of the box body.

10. The waterfall power generation device with debris removal function according to claim 9, characterized in that: The closable opening comprises: An electric rotating shaft, both ends of which are rotatably connected to the inner wall of the box; A sealing plate, wherein the electric rotating shaft passes through the sealing plate transversely, and the electric rotating shaft is fixedly connected to the sealing plate, and the outer diameter of the sealing plate matches the inner diameter of the box body.

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