Pond culture tail water treatment equipment

Abstract

The utility model relates to a pond culture tail water treatment equipment, including a plurality of processing monomer, and processing monomer includes box and degradation aeration unit, and the box of a plurality of processing monomers is detachably connected in proper order first and last, and both ends of the box are all grid structure, and the degradation aeration unit is installed in the corresponding box. The utility model has the advantages of simple structure, and the splicing type structure is more reasonable, is not limited by the approach road, transportation condition etc.

Description

Technical Field

[0001] This utility model relates to the technical field of aquaculture wastewater treatment equipment, specifically to a pond aquaculture wastewater treatment equipment. Background Technology

[0002] Aquaculture provides humans with high-quality animal protein and plays a vital role in addressing global food issues. my country is a major aquaculture producer, with aquaculture wastewater accounting for 6% of total agricultural emissions. The main pollutants are nitrogen and phosphorus, primarily contributing to eutrophication. Surveys indicate that 90% of traditional aquaculture farms in my country currently lack dedicated wastewater treatment facilities, resulting in direct discharge and substandard emissions. Sustainable development of aquaculture faces serious challenges, with pond aquaculture wastewater treatment being a particularly prominent issue. Current pond aquaculture models lack necessary water purification functions and wastewater treatment capabilities, necessitating innovation and upgrading of aquaculture practices.

[0003] Aquaculture wastewater treatment is characterized by large water volume (based on a pond with a water depth of 1.5m and one pond cleaning and drainage per year, approximately 100,000 m3 of wastewater is discharged per 100 mu of pond per year) and low pollutant concentration. Such projects have tight construction timelines and heavy tasks (according to relevant requirements, by 2024, 1 million mu of aquaculture ponds need to be upgraded and transformed).

[0004] Traditional wastewater treatment technologies and methods involve: equalization tank (lift pump) → wastewater treatment equipment / facilities. First, civil engineering is required to build the equalization tank and equipment foundation, which has a long construction period. Second, the large volume of water requires a large power lift pump, which leads to high operating electricity costs. Both construction and operating costs are high. In addition, ponds are usually contiguous, making it difficult to find suitable sites nearby for the foundation of wastewater treatment equipment, resulting in difficulties in land use coordination.

[0005] Currently, conventional pond water treatment technologies include the "three-pond, two-dam" approach and its variations. The "three-pond, two-dam" approach refers to a combined process of "sedimentation tank + filter dam + aeration tank + filter dam + ecological pond." This process integrates physical sedimentation, filter media filtration, aeration oxidation, and biological assimilation into a single unit, achieved through modifications to the ditches or ponds used in aquaculture. While this type of process has relatively low construction and operating costs, it relies entirely on plant absorption of pollutants, resulting in unstable treatment effects. It requires planting large quantities of vegetation, occupies a significant area, and faces challenges in land use coordination. Furthermore, the extensive use of vegetation leads to high maintenance costs, and the filter dams are prone to clogging and backwatering. Construction also requires first draining the pond and then constructing each dam using civil engineering, resulting in a long construction period and high construction difficulty. Many aquaculture ponds are located in contiguous areas in remote locations with inconvenient transportation, making equipment access difficult. Most use buoyancy boxes for buoyancy, but these boxes must be airtight, placing high demands on processing and production, and posing a risk of leakage and a high degree of danger.

[0006] Therefore, there is an urgent need for aquaculture wastewater treatment system and equipment that features low construction cost, short construction period, low operating cost, small footprint, stable treatment effect, easy transportation and handling, and high safety factor. Utility Model Content

[0007] This utility model provides a pond aquaculture wastewater treatment device, which aims to solve the problems in the prior art.

[0008] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0009] A pond aquaculture wastewater treatment device includes multiple treatment units, each treatment unit comprising a housing and a degradation aeration unit. The housings of the multiple treatment units are detachably connected end to end, and both ends of the housings have a grid-like structure. The degradation aeration unit is installed in the corresponding housing.

[0010] The beneficial effects of this utility model are: during use, the use of the box to assemble the degradation aeration unit and the use of the degradation aeration unit for aeration are conducive to the reproduction of microorganisms attached to the degradation aeration unit, so that the microorganisms can effectively degrade the harmful substances in the effluent and achieve effective harmless treatment of the effluent.

[0011] This utility model has a simple structure and adopts a reasonable splicing structure, which is not limited by access roads, transportation conditions, etc., and is easy to transport and handle.

[0012] Based on the above technical solution, the present invention can be further improved as follows.

[0013] Furthermore, the degradation aeration unit includes an aeration component and a biochemical degradation unit, which are respectively installed in the corresponding housing.

[0014] The beneficial effect of adopting the above-mentioned further solution is that during use, the aeration components and biochemical degradation units are assembled in the tank, and the aeration components are used for aeration, which is conducive to the reproduction of microorganisms attached to the biochemical degradation unit, so that the microorganisms can effectively degrade the harmful substances in the effluent and achieve effective harmless treatment of the effluent.

[0015] Furthermore, the degradation aeration unit also includes a support frame, which is fixedly installed inside the corresponding box; the aeration component and the biochemical degradation unit are respectively installed on the support frame.

[0016] The advantages of adopting the above-mentioned further solution are that the structure is simple and the design is reasonable. The aeration components and biochemical degradation units are assembled using a support frame, which is convenient for assembly.

[0017] Furthermore, the biochemical degradation unit includes multiple biochemical packing strips with attached microorganisms, and the multiple biochemical packing strips are evenly spaced and vertically fixed inside the support frame.

[0018] The advantages of adopting the above-mentioned further scheme are that it has a simple structure, reasonable design, and utilizes multiple biochemical packing belts with attached microorganisms to treat the effluent in a harmless manner, resulting in better treatment effect.

[0019] Furthermore, the aeration assembly includes an air pump and multiple aeration pipes, which are horizontally spaced within the support frame and interconnected. Each aeration pipe has a number of aeration holes evenly spaced on it. The air pump is connected to one of the aeration pipes via a pipeline.

[0020] The beneficial effect of adopting the above-mentioned further scheme is that, during use, an air pump is used to send air into multiple aeration pipes, and then the air escapes through several aeration holes on the multiple aeration pipes to increase the oxygen in the water, which is conducive to the reproduction of microorganisms.

[0021] Furthermore, some of the aeration pipes are horizontally arranged side by side on the upper part of the support frame, while the remaining aeration pipes are horizontally arranged side by side on the bottom of the support frame.

[0022] The advantages of adopting the above-mentioned further scheme are that the structure is simple, the distribution of multiple aeration pipes is more reasonable, which is conducive to the uniform distribution of oxygen in various areas of the multiple biochemical packing belts, thus ensuring the efficiency of microbial reproduction.

[0023] Furthermore, it also includes a battery compartment and a battery pack, the battery compartment being installed at one end of one of the housings located at the end; the battery pack being placed inside the battery compartment and electrically connected to the corresponding aeration assembly via wiring.

[0024] The advantages of adopting the above-mentioned further solution are that it has a simple structure, reasonable design, and uses a battery pack to power the aeration components; at the same time, the buoyancy chamber below the battery compartment also provides buoyancy, and is integrally molded, eliminating the risk of leakage and making it easy to use.

[0025] Furthermore, the processing unit also includes a solar panel, which is fixedly mounted on the top of the housing and electrically connected to a controller via wiring. The controller is electrically connected to the battery pack via wiring.

[0026] The advantages of adopting the above-mentioned further scheme are that it has a simple structure, reasonable design, and uses solar panels to convert electrical energy into electrical energy stored in the battery pack, making full use of solar energy and saving energy and protecting the environment.

[0027] Furthermore, splicing components are respectively installed on both sides of the two adjacent boxes.

[0028] The advantages of adopting the above-mentioned further solution are that the structure is simple, the design is reasonable, and the two adjacent boxes can be detachably connected by splicing components, making assembly convenient.

[0029] Furthermore, the splicing assembly includes at least one pair of connecting hooks and at least two pairs of fixing plates, wherein one pair of fixing plates is installed opposite to each other on both sides of one end of one of the boxes, and the other pair of fixing plates is installed opposite to each other on both sides of one end of the other box, and is distributed opposite to the pair of fixing plates located on one end of one of the boxes; the opposite ends of the two pairs of fixing plates are respectively provided with hook holes, and the two ends of the connecting hooks respectively fasten to the corresponding pair of hook holes.

[0030] The advantages of adopting the above-mentioned further solution are that the structure is simple and the design is reasonable. By using the two ends of the connecting hook to fasten the corresponding pair of hook holes, the splicing between the opposite ends of the two boxes can be realized, and the splicing is convenient. Attached Figure Description

[0031] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0032] Figure 2 for Figure 1 Enlarged view of A in the middle;

[0033] Figure 3 This is a side view of the present invention;

[0034] Figure 4 This is a top view of the present invention;

[0035] Figure 5 This is a schematic diagram of the structure of a single box in this utility model;

[0036] Figure 6 for Figure 5 A magnified view of B in the middle.

[0037] The attached diagram lists the components represented by each number as follows:

[0038] 1. Box body; 2. Support frame; 3. Biochemical packing material belt; 4. Aeration pipe; 5. Battery compartment; 6. Battery pack; 7. Solar panel; 8. Connecting hook; 8-1. Frame body; 8-2. Hook body; 9. Fixing plate; 10. Hook hole; 11. Floating frame. Detailed Implementation

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0040] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0041] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0043] Example 1

[0044] like Figures 1 to 6 As shown, this embodiment provides a pond aquaculture wastewater treatment device, including multiple treatment units. Each treatment unit includes a box 1 and a degradation aeration unit. The boxes 1 of the multiple treatment units are detachably connected end to end, and both ends of the box 1 have a grid-like structure. The degradation aeration unit is installed in the corresponding box 1.

[0045] During use, the degradation aeration unit is installed in the box 1. At the same time, the degradation aeration unit is used for aeration, which is conducive to the reproduction of microorganisms attached to the degradation aeration unit, so that the microorganisms can effectively degrade the harmful substances in the effluent and achieve effective harmless treatment of the effluent.

[0046] Preferably, in this embodiment, the box 1 is a rectangular box.

[0047] Preferably, in this embodiment, the top of the box 1 is provided with a buoyancy chamber and a buoyancy cylinder.

[0048] Preferably, in this embodiment, the two sides of the box 1 are open and each is equipped with a sealing plate that can be opened and closed.

[0049] In addition, the upper side of each sealing plate is rotatably connected to the upper side of the opening on one side of the box body 1 by multiple evenly spaced hinges, and its lower side can be rotated to fit against the lower side of the opening on one side of the box body 1 and is detachably connected to the lower side of one side of the box body 1 by screws. The design is reasonable and easy to assemble.

[0050] This embodiment has a simple structure and adopts a reasonable splicing structure, which is not limited by access roads, transportation conditions, etc., and is easy to transport and handle.

[0051] Example 2

[0052] Based on Example 1, in this example, the degradation aeration unit includes an aeration component and a biochemical degradation unit, which are respectively installed in the corresponding housing 1.

[0053] During use, the aeration components and biochemical degradation unit are assembled in the tank 1. The aeration components are used for aeration, which is conducive to the reproduction of microorganisms attached to the biochemical degradation unit, so that the microorganisms can effectively degrade the harmful substances in the effluent and achieve effective harmless treatment of the effluent.

[0054] Example 3

[0055] Based on Example 2, in this example, the degradation aeration unit further includes a support frame 2, which is fixedly installed inside the corresponding housing 1; the aeration component and the biochemical degradation unit are respectively installed on the support frame 2.

[0056] The scheme has a simple structure and reasonable design. It uses the support frame 2 to assemble the aeration components and biochemical degradation units, which is convenient to assemble.

[0057] Preferably, in this embodiment, the support frame 2 is preferably a rectangular frame, the shape and size of which are adapted to the shape and size of the box 1.

[0058] In addition, the aforementioned support frame 2 includes multiple round tubes, which are spliced ​​together to form a frame structure. The connection between the ends of the round tubes is a T-junction or a cross-junction.

[0059] Example 4

[0060] Based on Example 3, in this example, the biochemical degradation unit includes multiple biochemical packing strips 3 with microorganisms attached, and the multiple biochemical packing strips 3 are evenly spaced and vertically fixed inside the support frame 2.

[0061] The scheme has a simple structure and reasonable design. It uses multiple biochemical packing materials with attached microorganisms to treat the wastewater in three ways, and the treatment effect is good.

[0062] Preferably, in this embodiment, the two ends of each biochemical filler tape 3 are connected to the top and bottom of the support frame 2, respectively.

[0063] Example 5

[0064] Based on any one of Embodiments 3 to 4, in this embodiment, the aeration assembly includes an air pump and multiple aeration pipes 4. The multiple aeration pipes 4 are horizontally spaced within the support frame 2 and are interconnected. Each of the multiple aeration pipes 4 has a number of aeration holes evenly spaced on it. The air pump is connected to any one of the aeration pipes 4 through a pipeline.

[0065] In use, an air pump is used to send air into multiple aeration pipes 4, and then the air escapes through several aeration holes on the multiple aeration pipes 4 to increase the oxygen in the water, which is conducive to the reproduction of microorganisms.

[0066] Preferably, in this embodiment, packing material is provided on multiple aeration pipes 4 and between adjacent aeration pipes 4, and the entire frame is an integrated structure made of PVC pipe, with aeration stones and packing material connected to the frame. Due to the buoyancy of the frame, the entire structure will float inside the tank, always maintaining horizontality and balance, ensuring uniform aeration; high-efficiency biochemical packing material is used to efficiently immobilize microorganisms, ensuring stable treatment results.

[0067] Example 6

[0068] Based on Example 5, in this example, some of the aeration pipes 4 are horizontally arranged side by side on the upper part of the support frame 2, and the remaining aeration pipes 4 are horizontally arranged side by side on the bottom of the support frame 2.

[0069] The scheme has a simple structure and the distribution of multiple aeration pipes 4 is relatively reasonable, which helps to ensure that oxygen is evenly distributed in various areas of the multiple biochemical packing belts 3, thus ensuring the efficiency of microbial reproduction.

[0070] Example 7

[0071] Based on any one of Embodiments 2 to 6, this embodiment further includes a battery compartment 5 and a battery pack 6. The battery compartment 5 is installed at one end of one of the housings 1 located at the end. The battery pack 6 is placed inside the battery compartment 5 and is electrically connected to the corresponding aeration component via a line.

[0072] The solution has a simple structure and reasonable design. It uses battery pack 6 to power the aeration components. At the same time, the battery compartment 5 also provides buoyancy and is made of one piece of molded material, so there is no risk of leakage and it is easy to use.

[0073] Preferably, in this embodiment, the battery pack 6 includes multiple batteries connected in parallel.

[0074] Preferably, this embodiment also includes a floating frame 11, which is detachably installed at the end of the entire device, and its corresponding end is detachably connected to the end of the corresponding housing 1.

[0075] In addition, the aforementioned battery compartment 5 is fixedly installed on top of the floating frame 11.

[0076] Moreover, the end of the floating frame 11 away from the corresponding box 1 has a pointed structure similar to the bow of a ship. The design is reasonable, and its main function is to optimize the water flow, reduce the impact and force of the water flow on the equipment when it is placed in the water, and facilitate the movement of the entire equipment in the river.

[0077] The battery compartment is located in the main equipment box and connected to the main equipment box. It not only provides space to store batteries, but also the floating frame 11 (equivalent to a buoyancy tank) below the battery compartment provides buoyancy for the whole equipment, so that the whole equipment is suspended in the water and rises and falls with the water level. It is also made of one piece of molding, so there is no risk of leakage.

[0078] Preferably, in this embodiment, the battery compartment 5 is also equipped with an electrical control cabinet. The operation of the air pump and the photovoltaic power generation system in the electrical control cabinet are controlled by the electrical control cabinet. The electrical control cabinet is equipped with a smart Internet of Things switch, which can be operated remotely.

[0079] Example 8

[0080] Based on Example 7, in this example, the processing unit further includes a solar panel 7, which is fixedly mounted on the top of the housing 1 and electrically connected to the controller via a line. The controller is electrically connected to the battery pack 6 via a line.

[0081] The scheme has a simple structure and reasonable design. It uses solar panels 7 to convert electrical energy into electrical energy and store it in the battery pack, making full use of solar energy and saving energy and protecting the environment.

[0082] Example 9

[0083] Based on the above embodiments, in this embodiment, splicing components are respectively installed on both sides of the two adjacent boxes 1.

[0084] The solution has a simple structure and a reasonable design. The two adjacent boxes 1 can be detachably connected by splicing components, making assembly convenient.

[0085] The aforementioned box 1 is made of stainless steel, with splicing components at both ends along its length. Each box is spliced ​​together using these components, allowing for flexible assembly as needed. The total length of the equipment can be freely set, and each individual unit is appropriately sized, enabling it to pass through remote and narrow roads without being restricted by region or road conditions.

[0086] Example 10

[0087] Based on Embodiment 9, in this embodiment, the splicing assembly includes at least one pair of connecting hooks 8 and at least two pairs of fixing plates 9, wherein one pair of fixing plates 9 is installed opposite to each other on both sides of one end of one of the boxes 1, and the other pair of fixing plates 9 is installed opposite to each other on both sides of one end of the other box 1, and is distributed opposite to the pair of fixing plates 9 located on one end of one of the boxes 1; the opposite ends of the two pairs of fixing plates 9 are respectively provided with hook holes 10, and the two ends of the connecting hooks 8 respectively fasten to the corresponding pair of hook holes 10.

[0088] The scheme has a simple structure and reasonable design. It uses the two ends of the connecting hook 8 to fasten the corresponding pair of hook holes 10 to achieve splicing between the opposite ends of the two boxes 1, which is convenient.

[0089] Preferably, in this embodiment, the connecting hook 8 includes a frame 8-1 and two hooks 8-2. The two hooks 8-2 are distributed opposite to each other at both ends of the frame 8-1. The ends of the hooks that are close to each other are slidably connected to and positioned at both ends of the frame 8-1 so as to move away from or close to each other. The ends of the two hooks 8-2 that are far apart from each other are respectively hook-shaped and can be hooked into the pair of hook holes 8.

[0090] In addition, the frame 8-1 is hollow in the middle and has channels at both ends. The two hooks 8-2 pass through the two channels at their close ends. Moreover, the frame 8-1 has screw holes at both ends that communicate with the two channels. Screws for locking the two hooks 8-2 are threaded into the two screw holes.

[0091] Based on the above scheme, the corresponding end of the floating frame 11 and the corresponding end of the corresponding box 1 are also connected by the above splicing components.

[0092] Preferably, in this embodiment, the floating frame 11 is connected to the corresponding box and the two sides of the adjacent two boxes 1 by two pairs of splicing components.

[0093] The assembly process and working principle of this utility model are as follows:

[0094] During assembly, multiple boxes 1 and floating frames 11 are connected using splicing components, making splicing convenient;

[0095] In use, the tank 1 is equipped with multiple aeration pipes 4 and multiple biochemical packing belts 3 with attached microorganisms. At the same time, the multiple aeration pipes 4 are used for aeration, which is conducive to the reproduction of microorganisms attached to the multiple biochemical packing belts 3, so that the microorganisms can effectively degrade harmful substances in the effluent and achieve effective harmless treatment of the effluent.

[0096] It should be noted that all electronic components involved in this utility model adopt existing technology, and the electrical connections between the above-mentioned components and the connection circuits between the components are existing technology.

[0097] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0098] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0099] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pond aquaculture wastewater treatment device, characterized in that: It includes multiple treatment units, each of which includes a housing (1) and a degradation aeration unit. The housings (1) of the multiple treatment units are detachably connected end to end in sequence, and both ends of the housings (1) are grid-like structures. The degradation aeration unit is installed in the corresponding housing (1).

2. The pond aquaculture wastewater treatment equipment according to claim 1, characterized in that: The degradation aeration unit includes an aeration component and a biochemical degradation unit, which are respectively installed in the corresponding box (1).

3. The pond aquaculture wastewater treatment equipment according to claim 2, characterized in that: The degradation aeration unit also includes a support frame (2), which is fixedly installed inside the corresponding box (1); the aeration component and the biochemical degradation unit are respectively installed on the support frame (2).

4. The pond aquaculture wastewater treatment equipment according to claim 3, characterized in that: The biochemical degradation unit includes multiple biochemical packing strips (3) with microorganisms attached, and the multiple biochemical packing strips (3) are evenly spaced and vertically fixed inside the support frame (2).

5. The pond aquaculture wastewater treatment equipment according to claim 3, characterized in that: The aeration assembly includes an air pump and multiple aeration pipes (4). The multiple aeration pipes (4) are installed horizontally at intervals in the support frame (2) and are interconnected. Each of the multiple aeration pipes (4) has a number of aeration holes evenly spaced on it. The air pump is connected to one of the aeration pipes (4) through a pipeline.

6. The pond aquaculture wastewater treatment equipment according to claim 5, characterized in that: Some of the aeration pipes (4) are horizontally arranged side by side on the upper part of the support frame (2), and the remaining aeration pipes (4) are horizontally arranged side by side on the bottom of the support frame (2).

7. The pond aquaculture wastewater treatment equipment according to claim 2, characterized in that: It also includes a battery compartment (5) and a battery pack (6), wherein the battery compartment (5) is installed at one end of one of the housings (1) located at the end; the battery pack (6) is placed inside the battery compartment (5) and is electrically connected to the corresponding aeration assembly via a line.

8. The pond aquaculture wastewater treatment equipment according to claim 7, characterized in that: The processing unit also includes a solar panel (7), which is fixedly mounted on the top of the housing (1) and electrically connected to the controller via a line. The controller is electrically connected to the battery pack (6) via a line.

9. The pond aquaculture wastewater treatment equipment according to any one of claims 1-8, characterized in that: Two adjacent boxes (1) have splicing components installed on opposite sides at both ends.

10. The pond aquaculture wastewater treatment equipment according to claim 9, characterized in that: The splicing assembly includes at least one pair of connecting hooks (8) and at least two pairs of fixing plates (9), wherein one pair of fixing plates (9) is installed opposite to each other on both sides of one end of one of the boxes (1), and the other pair of fixing plates (9) is installed opposite to each other on both sides of one end of the other box (1), and is distributed opposite to the pair of fixing plates (9) located on one end of one of the boxes (1); the opposite ends of the two pairs of fixing plates (9) are respectively provided with hook holes (10), and the two ends of the connecting hooks (8) respectively fasten to the corresponding pair of hook holes (10).

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