Spliced floating plate for marine ecological environment restoration

Abstract

The invention discloses a spliced floating plate for marine ecological environment restoration, and relates to the technical field of marine ecological environment treatment. The device comprises a plurality of hexagonal unit floating plates and connecting pieces, planting pots are arranged in the middles of the unit floating plates, and biological adhesion promoting layers are integrated on the surfaces of the unit floating plates. Rapid interlocking splicing is achieved through the movable columns, the fixed columns and the clamping plate meshing mechanisms of the connecting pieces, and a stable floating plate array is formed; a bearing net plate, a ventilation through hole and an adjustable rotating door are arranged in the planting pot, so that the plant growth and biological inhabitation environment is optimized. The problems that an existing floating plate is complex in connection and poor in stability are solved, and the floating plate has the advantages of efficient splicing, ecological restoration, easy maintenance and the like and is suitable for large-area marine ecological restoration engineering.

Description

Technical Field

[0001] The present invention belongs to the technical field of marine ecological environment management, and in particular relates to a spliced floating plate for marine ecological environment restoration. Background Art

[0002] Marine pollution generally refers to human-induced changes to the ocean's natural state, resulting in damage to its ecosystem. Pollution caused by the entry of harmful substances into the marine environment can damage biological resources, endanger human health, hinder fishing and other human activities at sea, and impair seawater and environmental quality. Due to its vast surface area and immense water storage capacity, the ocean has long been the most stable ecosystem on Earth. Various substances entering the ocean from land are absorbed by the ocean without significant changes to the ocean itself. However, in recent decades, with the development of global industry, marine pollution has become increasingly severe, causing significant changes to the environment in some areas, and this problem is expected to continue to expand.

[0003] Marine pollution is characterized by its multiple sources, persistence, widespread reach, and difficulty in control. The turbidity caused by marine pollution severely impacts the photosynthesis of marine plants (phytoplankton and algae), thereby affecting marine productivity and harming fish. Toxic substances such as heavy metals and toxic organic compounds accumulate in the ocean and, through the accumulation of marine organisms, poison marine animals and other prey. Oil pollution forms extensive oil films on the ocean surface, preventing oxygen from dissolving into the seawater. The decomposition of oil also depletes dissolved oxygen in the water, causing hypoxia and harming marine life, seabirds, and humans. Red tides caused by aerobic organic matter pollution (a result of eutrophication) cause hypoxia in the seawater and lead to the death of marine life. Marine pollution also damages coastal tourism resources. Consequently, marine pollution has attracted increasing attention from the international community.

[0004] In response to marine ecological problems, the existing treatment method is to use floating plates with algae attached, where the attached algae can remove nitrogen and phosphorus at rates of up to 80% and over 60% respectively, and the algae's ability to purify water bodies is used to purify eutrophic waters. However, most of the existing floating plates used for marine ecological environment restoration are used alone. When a larger area of water needs to be repaired, the floating plates are often connected by ropes. This connection method is too complicated and there is also the problem of unstable connection, which makes it inconvenient for people to splice multiple floating plates together as needed. In view of this, the present invention proposes a spliced floating plate for marine ecological environment restoration to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a spliced floating plate for marine ecological environment restoration to solve the existing problems.

[0006] To solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention is a splicing floating plate for marine ecological environment restoration, comprising at least two interlocking unit floating plates, adjacent unit floating plates fixedly connected by connecting pieces, the unit floating plates being a hexagonal structure, a mounting through hole being provided in the middle of the unit floating plate, a step being provided at the upper end of the mounting through hole, an elastic buckle being fixed at the upper end of the side surface of the step, splicing ears being provided at the six corners of the unit floating plate, the splicing ears being a fan-shaped plate structure, a splicing hole being provided on the upper surface of the splicing ears, an arc-shaped notch being provided at the center of the splicing ears, and an integrated biological attachment promoting layer being provided on the surface of the unit floating plate.

[0007] As a further improvement of the above technical solution: The upper end of the planting pot is provided with a pot edge, the upper surface of the pot edge is provided with an avoidance groove and a fixing hole matching the elastic buckle, a receiving mesh plate is fixed in the planting pot, a plurality of root through holes are provided on the upper surface of the receiving mesh plate, a plurality of ventilation through holes are provided in the lower section of the peripheral side of the planting pot, a movable through hole is symmetrically provided in the lower section of the planting pot, a rotating door is hinged in the movable through hole, the hinge shaft of the rotating door passes through the planting pot and extends to the outside thereof, a toothed limit plate is fixed on the upper end of the hinge shaft, and a limit groove matching the toothed limit plate is fixed on the pot edge; The connecting part includes a movable column, a movable cavity is opened in the movable column, three fixed columns are fixed at equidistant intervals on the upper end of the side surface of the movable column, the fixed column is an "L"-shaped columnar structure, the fixed column is provided with a slot facing the side of the movable column, the side surface of the movable column is provided with an opening adapted to the slot, three clamping plates are hinged at equidistant intervals on the circumference of the movable cavity, a number of convex teeth are provided at the tail end of the clamping plate, the position of the clamping plate is adapted to the opening, a movable hole is opened on the bottom surface of the movable cavity, a movable rod is nested in the movable hole, a Y-shaped plate is fixed on the upper end of the movable rod, and tooth plates are provided on the three convex surfaces of the Y-shaped plate, and the tooth plates are engaged with the convex teeth; a pull rod is fixed on the upper end of the Y-shaped plate, the pull rod extends through the movable column to the outside, a groove is opened on the side surface of the pull rod, a spring is fixed in the groove, and a limiting protrusion is fixed at one end of the spring.

[0008] In one embodiment, a handle is provided on the upper surface of the basin, the shape and size of the toothed limiting disk are adapted to the limiting groove, and the toothed limiting disk is plugged into the limiting groove.

[0009] In one embodiment, the hinge shaft is connected to the middle part of the rotating door via a key, the hinge shaft is slidably connected to the rotating door, and the hinge shaft is rotationally matched with the planting pot.

[0010] In one embodiment, the shape and size of the card plate are adapted to the card slot, and the card plate and the card slot cooperate with each other.

[0011] In one embodiment, the shape and size of the tooth plate are adapted to the convex teeth, and the tooth plate and the convex teeth cooperate with each other.

[0012] In one embodiment, the shape and size of the movable hole are adapted to the movable rod, and the movable hole and the movable rod cooperate with each other.

[0013] In one embodiment, the shape and size of the movable column are adapted to the arc-shaped notch, and the shape and size of the fixed column are adapted to the splicing hole.

[0014] In one embodiment, the free end surface of the limiting protrusion is a spherical surface, the shape and size of the limiting protrusion are adapted to the groove, and the limiting protrusion and the groove cooperate with each other.

[0015] In one embodiment, the biological attachment layer comprises a microporous structure and a calcium ion sustained-release material, the shape and size of the elastic buckle are adapted to the fixing hole, and the elastic buckle and the fixing hole cooperate with each other.

[0016] In one embodiment, the shape and size of the movable through hole are adapted to the rotating door, and the movable through hole and the rotating door cooperate with each other.

[0017] The present invention has the following beneficial effects: Modular splicing design: The use of hexagonal unit floating plates and interlocking connectors can achieve fast and flexible large-area splicing, adapt to the needs of different water shapes, and significantly improve construction efficiency.

[0018] Stable connection structure: Through the mechanical engagement mechanism of the movable column, the clamping plate and the tooth plate, combined with the spring limit device, the connection between the floating plates is ensured to be firm and have strong wind and wave resistance, avoiding the instability of traditional rope connection.

[0019] Optimization of ecological restoration function: The surface of the unit floating plate integrates a microporous structure and a biological attachment layer of calcium ion slow-release material to promote the attachment of marine organisms such as corals and algae, and accelerate the ecological restoration process.

[0020] Smart planting pot design: The planting pot is equipped with ventilation holes, root holes and an openable and closable rotating door, which not only ensures the breathability and growth space of plant roots, but also provides a shelter for small marine life and enhances ecological diversity.

[0021] Convenient maintenance: The planting pot is fixed by elastic buckles and limit slots, and the handle design makes it easy to disassemble and replace plants or clean and maintain, reducing long-term operation and maintenance costs.

[0022] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 This is a schematic diagram of the overall structure of a spliced floating plate for marine ecological environment restoration; Figure 2 Schematic diagram of the structure of the unit floating plate in the present invention; Figure 3 This is a schematic diagram of the structure of the planting pot in the present invention; Figure 4 for Figure 3 Enlarged view of part A; Figure 5 Schematic diagram of the structure of the connecting member in the present invention; Figure 6 Schematic diagram of the internal structure of the connecting piece in the present invention; Figure 7 is a top view of the connecting member of the present invention; Figure 8 for Figure 7 Middle AA section; Figure 9 for Figure 8 Middle BB cross-section; Figure 10 It is a schematic diagram of the structure of the unit floating plates in the present invention when they are spliced together.

[0025] In the accompanying drawings, the components represented by the reference numerals are as follows: 1. Unit floating plate; 101. Installation hole; 102. Step; 103. Elastic buckle; 104. Splicing ear; 105. Splicing hole; 106. Arc notch; 107. Planting pot; 108. Pot edge; 109. Avoidance groove; 110. Fixing hole; 111. Undertaking mesh plate; 112. Root hole; 113. Ventilation hole; 114. Movable hole; 115. Rotating door; 116. Hinge axis; 11 7. Toothed limit plate; 118. Limiting groove; 119. Handle; 2. Connecting piece; 201. Movable column; 202. Movable cavity; 203. Fixed column; 204. Slot; 205. Opening; 206. Clamping plate; 207. Protruding tooth; 208. Movable hole; 209. Movable rod; 210. Y-shaped plate; 211. Tooth plate; 212. Pull rod; 213. Groove; 214. Spring; 215. Limiting protrusion. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0028] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0029] Example 1:

[0030] See also Figures 1-10 As shown, the present invention is a splicing floating plate for marine ecological environment restoration, comprising at least two interlocking unit floating plates 1, adjacent unit floating plates 1 are fixedly connected by a connector 2, the unit floating plate 1 is a hexagonal structure, a mounting through hole 101 is provided in the middle of the unit floating plate 1, a step 102 is provided at the upper end of the mounting through hole 101, an elastic buckle 103 is fixed to the upper end of the side surface of the step 102, and a splicing ear 104 is provided at each of the six corners of the unit floating plate 1, the splicing ear 104 is a fan-shaped plate structure, a splicing hole 105 is provided on the upper surface of the splicing ear 104, an arc-shaped notch 106 is provided at the center of the splicing ear 104, and a biological attachment promoting layer is integrated on the surface of the unit floating plate 1.

[0031] A rim 108 is provided at the upper end of the planting pot 107. An avoidance groove 109 and a fixing hole 110 are provided on the upper surface of the rim 108, which match the elastic buckle 103. A receiving mesh 111 is fixed in the planting pot 107. A plurality of root through holes 112 are provided on the upper surface of the receiving mesh 111. A plurality of ventilation holes 113 are provided on the lower section of the side surface of the planting pot 107. Movable through holes 114 are symmetrically provided on the lower section of the planting pot 107. A revolving door 115 is hinged in the movable through hole 114 to provide a refuge for marine life. A hinge shaft 116 of the revolving door 115 passes through the planting pot 107 and extends to the outside thereof. A toothed limit plate 117 is fixed on the upper end of the hinge shaft 116. A limit groove 118 matching the toothed limit plate 117 is fixed on the rim 108. The connecting member 2 includes a movable column 201, a movable cavity 202 is opened in the movable column 201, and three fixed columns 203 are fixed to the upper end of the side surface of the movable column 201 at equal distances in a circle. The fixed column 203 is an "L"-shaped column structure, and a card slot 204 is opened on the side of the fixed column 203 facing the movable column 201. An opening 205 adapted to the card slot 204 is opened on the side surface of the movable column 201. Three card plates 2 are hinged at equal distances in a circle in the movable cavity 202. 06, the shape and size of the card plate 206 are adapted to the card slot 204, and the card plate 206 and the card slot 204 cooperate with each other; a plurality of convex teeth 207 are provided at the tail end of the card plate 206, and the position of the card plate 206 is adapted to the opening 205, and a movable hole 208 is provided on the bottom surface of the movable cavity 202, and a movable rod 209 is nested in the movable hole 208. A Y-shaped plate 210 is fixed on the upper end of the movable rod 209, and the three convex surfaces of the Y-shaped plate 210 are all provided with There is a tooth plate 211, the shape and size of the tooth plate 211 are adapted to the convex teeth 207, and the tooth plate 211 and the convex teeth 207 cooperate with each other; the tooth plate 211 is meshed with the convex teeth 207; a pull rod 212 is fixed to the upper end of the Y-shaped plate 210, and the pull rod 212 extends to the outside through the movable column 201, and a groove 213 is opened on the side surface of the pull rod 212, and a spring 214 is fixed in the groove 213, and one end of the spring 214 is fixed with a limiting protrusion 215, which limits The free end face of the limiting protrusion 215 is a spherical surface, and the shape and size of the limiting protrusion 215 are adapted to the groove 213. The limiting protrusion 215 and the groove 213 cooperate with each other, wherein the limiting protrusion 215 is located in the groove 213 and is close to the spring 214. The end side surface is fixed with an elastic sealing ring, which can be used to ensure that the groove 214 and the limiting protrusion 215 form a sealed cavity, that is, it does not affect the movement of the limiting protrusion 215 in the groove 214.

[0032] Furthermore, a handle 119 is provided on the upper surface of the basin edge 108 , and the shape and size of the toothed limiting disk 117 are adapted to the limiting groove 118 , and the toothed limiting disk 117 is plugged into the limiting groove 118 .

[0033] Furthermore, the hinge shaft 116 is connected to the middle portion of the rotating door 115 via a key, the hinge shaft 116 is slidably connected to the rotating door 115 , and the hinge shaft 116 is rotationally matched with the planting pot 107 .

[0034] Furthermore, the shape and size of the movable hole 208 are adapted to the movable rod 209 , and the movable hole 208 and the movable rod 209 cooperate with each other.

[0035] Furthermore, the shape and size of the movable column 201 are adapted to the arc-shaped notch 106 , and the shape and size of the fixed column 203 are adapted to the splicing hole 105 .

[0036] Furthermore, the biological attachment layer includes a microporous structure and a calcium ion slow-release material. The surface of the biological attachment layer is provided with a concave-convex texture and a microporous structure, and a calcium-based material is used to promote the attachment of coral larvae. The shape and size of the elastic buckle 103 are adapted to the fixing hole 110, and the elastic buckle 103 and the fixing hole 110 cooperate with each other.

[0037] Furthermore, the shape and size of the movable through hole 114 are adapted to the rotating door 115 , and the movable through hole 114 and the rotating door 115 cooperate with each other.

[0038] Example 2:

[0039] See also Figures 1-10 As shown, this embodiment is a method for using a spliced floating board for marine ecological environment restoration: Unit floating plate splicing: Align the splicing ears 104 of the adjacent unit floating plates 1 so that the arc-shaped notch 106 matches the movable column 201 of the connector 2. After inserting the movable column 201, press the pull rod 212, and the fixed column 203 is embedded in the splicing hole 105. Then pull the pull rod 212 upward to drive the Y-shaped plate 210 to drive the tooth plate 211 to engage with the card plate 206. At this time, the limiting protrusion 215 follows the pull rod 212 from the movable cavity 202 to the top of the movable column 201, and the spring 214 pushes the limiting protrusion 215 out of the locking position to complete the interlocking connection.

[0040] Repeat the operation to assemble a floating plate array of the required size according to the hexagonal expansion structure.

[0041] Planting pot installation and plant planting: Align the planting pot 107 with the mounting hole 101 of the unit floating plate 1, and place the pot edge 108 away from the elastic buckle 103 in the avoidance groove 109 on the step 102. Then rotate the planting pot 107 so that the elastic buckle 103 is engaged in the fixing hole 110. Pull the toothed limiting plate 117 to move the hinge shaft 116 slightly upward to disengage it from the limiting groove 118. Then rotate the hinge shaft 116 to rotate the rotating door 115 to a certain appropriate angle, and then insert the toothed limiting plate 117 into the limiting groove 118 to fix it.

[0042] Seaweed or coral seedlings are laid on the receiving mesh plate 111, and the roots extend into the water through the root holes. The rotating door 115 can be opened as needed to allow marine life to enter and exit.

[0043] Maintenance and Adjustment: Pull the handle 119 to remove the planting pot 107, clean the sediment or replace the plant; The opening and closing angle of the rotating door 115 is adjusted by rotating the hinge shaft 116 to optimize the water flow and the space for biological activities; During disassembly, the pull rod 212 of the connector 2 is pressed to release the clamping plate 206 and separate the unit floating plate 1 .

[0044] Deployment and recovery: Drag the assembled floating plate array to the target waters and anchor it; When recycling, disassemble according to the above steps to facilitate transportation and reuse.

[0045] It should be further explained that the main body of the float is made of marine degradable plastic (such as polyhydroxyalkanoate PHA) and bamboo fiber composite material; the main body of the connector is also made of marine degradable plastic (such as polyhydroxyalkanoate PHA) and bamboo fiber composite material; the surfaces of other internal connecting parts are coated with epoxy anti-corrosion coatings, etc.

[0046] Throughout this specification, references to terms such as "one embodiment," "example," and "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0047] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A spliced floating plate for marine ecological environment restoration, comprising at least two interlocking unit floating plates (1), wherein adjacent unit floating plates (1) are fixedly connected via a connecting member (2), and characterized in that: The unit floating plate (1) is a hexagonal structure, a mounting through hole (101) is provided in the middle of the unit floating plate (1), a step (102) is provided at the upper end of the mounting through hole (101), an elastic buckle (103) is fixed to the upper end of the side surface of the step (102), six corners of the unit floating plate (1) are provided with splicing ears (104), the splicing ears (104) are fan-shaped plate structures, the splicing ears (104) are provided with splicing holes (105) on the upper surface, and an arc-shaped notch (106) is provided at the center of the splicing ears (104), and a biological attachment promoting layer is integrated on the surface of the unit floating plate (1); A planting pot (107) is installed in the installation through hole (101), and a pot edge (108) is provided at the upper end of the planting pot (107). The upper surface of the pot edge (108) is provided with an avoidance groove (109) and a fixing hole (110) that match the elastic buckle (103). A receiving mesh plate (111) is fixed in the planting pot (107), and a plurality of root through holes (112) are provided on the upper surface of the receiving mesh plate (111). The lower section of the side surface of the planting pot (107) is provided with a plurality of root through holes (112). A plurality of ventilation holes (113) are provided, and movable through holes (114) are symmetrically opened on the lower section of the planting pot (107). A rotating door (115) is hinged in the movable through hole (114). The hinge shaft (116) of the rotating door (115) passes through the planting pot (107) and extends to the outside thereof. A toothed limiting disk (117) is fixed to the upper end of the hinge shaft (116), and a limiting groove (118) matching the toothed limiting disk (117) is fixed on the pot edge (108); The connecting member (2) comprises a movable column (201), a movable cavity (202) is provided in the movable column (201), three fixed columns (203) are fixed at equal intervals on the upper end of the side surface of the movable column (201), the fixed column (203) is an "L"-shaped columnar structure, a slot (204) is provided on the side surface of the fixed column (203) facing the movable column (201), an opening (205) adapted to the slot (204) is provided on the side surface of the movable column (201), three card plates (206) are hinged at equal intervals in the movable cavity (202), a plurality of protruding teeth (207) are provided at the rear end of the card plate (206), and the position of the card plate (206) is aligned with the opening (205). Adaptation, the bottom surface of the movable cavity (202) is provided with a movable hole (208), a movable rod (209) is nested in the movable hole (208), a Y-shaped plate (210) is fixed to the upper end of the movable rod (209), three convex surfaces of the Y-shaped plate (210) are provided with tooth plates (211), the tooth plates (211) are engaged with the convex teeth (207); a pull rod (212) is fixed to the upper end of the Y-shaped plate (210), the pull rod (212) passes through the movable column (201) and extends to the outside, a groove (213) is provided on the side surface of the pull rod (212), a spring (214) is fixed in the groove (213), and a limiting protrusion (215) is fixed at one end of the spring (214).

2. The spliced floating plate for marine ecological environment restoration according to claim 1, characterized in that: A handle (119) is provided on the upper surface of the basin edge (108), and the shape and size of the toothed limiting disk (117) are adapted to the limiting groove (118), and the toothed limiting disk (117) is plugged into the limiting groove (118).

3. The spliced floating plate for marine ecological environment restoration according to claim 1 is characterized in that: The hinge shaft (116) is connected to the middle part of the rotating door (115) via a key, the hinge shaft (116) is slidably connected to the rotating door (115), and the hinge shaft (116) is rotationally matched with the planting pot (107).

4. The spliced floating plate for marine ecological environment restoration according to claim 1, characterized in that: The shape and size of the card plate (206) are adapted to the card slot (204), and the card plate (206) and the card slot (204) cooperate with each other.

5. The spliced floating plate for marine ecological environment restoration according to claim 1 is characterized in that: The shape and size of the tooth plate (211) are adapted to the convex teeth (207), and the tooth plate (211) and the convex teeth (207) cooperate with each other.

6. The spliced floating plate for marine ecological environment restoration according to claim 1, characterized in that: The shape and size of the movable hole (208) are adapted to the movable rod (209), and the movable hole (208) and the movable rod (209) cooperate with each other.

7. The spliced floating plate for marine ecological environment restoration according to claim 1 is characterized in that: The shape and size of the movable column (201) are both adapted to the arc-shaped notch (106), and the shape and size of the fixed column (203) are both adapted to the splicing hole (105).

8. The spliced floating plate for marine ecological environment restoration according to claim 1, characterized in that: The free end surface of the limiting protrusion (215) is a spherical surface, the shape and size of the limiting protrusion (215) are adapted to the groove (213), and the limiting protrusion (215) and the groove (213) cooperate with each other.

9. The spliced floating plate for marine ecological environment restoration according to claim 1, characterized in that: The biological attachment layer comprises a microporous structure and a calcium ion sustained-release material. The shape and size of the elastic buckle (103) are adapted to the fixing hole (110), and the elastic buckle (103) and the fixing hole (110) cooperate with each other.

10. The spliced floating plate for marine ecological environment restoration according to claim 1, characterized in that: The shape and size of the movable through hole (114) are adapted to the rotating door (115), and the movable through hole (114) and the rotating door (115) cooperate with each other.

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