A green campus practice plantation water collection utilization device

Abstract

The application discloses to the technical field of campus water collecting facilities, in particular to a water collecting and utilizing device for a green campus practice plantation, which comprises a small concrete structure, a water collecting assembly and a planting auxiliary assembly, three sunken cavities are uniformly arranged on one side of the small concrete structure, a lifting bottom platform is movably arranged in each sunken cavity through a lifting assembly, a metal supporting shell is embedded at the upper end of the lifting bottom platform, the traditional sunken water storage tank is arranged as a plurality of plastic inner tubes which can be lifted up and down, the water collecting assembly can filter and collect the rainwater which naturally falls near the planting area and the rainwater collected by surrounding devices during use, then the rainwater flows into the corresponding plastic inner tube through a water conveying groove, then the plastic inner tube can be lifted up and down through the lifting assembly, when the rainwater is utilized, the plastic inner tube can naturally flow out after being lifted up, and a water pump is not needed, in addition, the composting box of the planting auxiliary assembly can realize selective water and fertilizer preparation of the collected rainwater, and the richness of the planting practice is improved.

Description

Technical Field

[0001] This invention relates to the field of campus water collection facilities technology, specifically a water collection and utilization device for a green campus practical plantation. Background Technology

[0002] The Green Campus Practice Plantation is a small planting space on campus that integrates education, labor practice, ecological science popularization, and landscaping. With localized and ecological planting as its core, it provides students with a real-world classroom for labor practice, nature observation, and ecological cognition through the planting and maintenance of vegetables, flowers, herbs, and native plants. The campus water collection system can collect rainwater from rooftops, roads, and planting areas, which is then purified and used for greening irrigation, site cleaning, and landscape water replenishment, reducing municipal tap water consumption and lowering campus operation and maintenance costs. The combination of the water collection system and the practice plantation allows students to intuitively understand the concepts of water cycle and water conservation, strengthens ecological and environmental protection education, and promotes the implementation of a green and low-carbon campus. Existing rainwater collection devices are mostly built underground, collecting filtered rainwater into storage tanks through collection channels. They require a pump to supply the rainwater during use. However, because the collected rainwater contains sediment, sediment accumulates in both the pump and the storage tank after prolonged use, necessitating regular cleaning. Cleaning the storage tank requires operators to descend into it, posing a safety hazard and hindering practical work for students. Furthermore, existing rainwater collection devices have limited functionality. Summary of the Invention

[0003] The purpose of this invention is to provide a water collection and utilization device for a green campus practical plantation, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a water collection and utilization device for a green campus practical planting area, comprising: A small concrete structure has three sunken cavities evenly opened on one side. A lifting platform is movably installed in the sunken cavity through a lifting assembly. A metal support shell is pre-embedded at the upper end of the lifting platform. The lifting assembly includes two winding turntables, two lifting steel cables and four lifting slide rails. The four lifting slide rails are vertically installed on the four sides of the sunken cavity. The metal support shell is slidably connected to the lifting slide rails. A water collection assembly is located on the side of a small concrete structure near the sinking cavity. The water collection assembly includes a water collection tank, two filter support plates, and two filter cloths. The water collection tank is connected to the sinking cavity. A planting auxiliary component is provided above the sunken cavity. The planting auxiliary component includes a safety cover and a compost box, which is located directly above the plastic inner cylinder.

[0005] Preferably, a plastic inner cylinder is inserted into the metal support shell, the cross-sectional area of ​​the metal support shell is smaller than the cross-sectional area of ​​the lifting platform, and a small concrete structure is located below the three sinking cavities and has an external drainage channel connected horizontally. Two bottom pads are horizontally provided at the lower end of the sinking cavities, and the lower end of the lifting platform is in contact with the upper end of the two bottom pads.

[0006] Preferably, the four lifting slide rails are vertically embedded on both sides of the sunken cavity, and the metal support shell and the lifting base are provided with guide pulleys on the side near the lifting slide rails, with one side of the guide pulleys connected to the lifting slide rails.

[0007] Preferably, the sinking cavity has vertically opened lifting slots on both sides, and the lifting platform is provided with lifting plates on both sides of the lifting slots. The lifting plates are horizontally inserted into the lifting slots, and one end of each of the two lifting steel cables is inserted into the lifting slots and connected to the upper end of the lifting platform.

[0008] Preferably, the small concrete structure has two symmetrical control grooves on one side of the sinking cavity. The control grooves between two adjacent sinking cavities are shared. A synchronous coupling is horizontally inserted between two adjacent control grooves through a bearing. A winding turntable is sleeved on one side of the synchronous coupling located in the control groove. A driven bevel gear is sleeved on one side of the synchronous coupling, and the driven bevel gear is located in the control groove.

[0009] Preferably, each of the control grooves is provided with a sealing support cover by a bolt sealing cover. A drive shaft is vertically inserted into one side of the sealing support cover via a dual-drive control console. The lower end of the drive shaft is inserted into the control groove and is provided with a drive bevel gear. The drive bevel gear is meshed with a driven bevel gear on one side of the synchronous coupling shaft.

[0010] Preferably, the control groove and the small concrete structure are both horizontally equipped with protective covers above the lifting trough. The two protective covers are joined together on one side. The two protective covers are equipped with reversing wheels that rotate through the support shaft. The end of the lifting cable away from the lifting plate passes through the protective cover and is inserted into the control groove. The side of the lifting cable inside the protective cover is connected to the two reversing wheels. The side of the lifting cable inside the control groove is wound on the take-up turntable.

[0011] Preferably, the water collection trough is located on the upper side of the small concrete structure, and the small concrete structure is provided with side baffles on both sides of the water collection trough. Two laying grooves are opened at the upper end of the water collection trough, and two filter support plates are stacked and laid in the laying grooves of the water collection trough. Two filter cloths are laid horizontally between the two filter support plates.

[0012] Preferably, the water collection tank has a horizontally connected sinking cavity with a water delivery tank. A water guide pipe is provided on one side of the water delivery tank in the sinking cavity, and the water guide pipe is close to the metal support shell and higher than the upper end of the metal support shell. A small concrete structure has a vertically opened insert plate slot on one side of the water delivery tank. A selection insert plate is inserted into the insert plate slot. The selection insert plate has several fine filter holes at the position of the water delivery tank.

[0013] Preferably, four overlapping cover plates are symmetrically arranged on the upper ends of both sides of the safety cover plate. The lower ends of the safety cover plate are inserted into the sinking cavity. The lower ends of the four overlapping cover plates are horizontally placed on the upper end of the small concrete structure. The four overlapping cover plates cover the four lifting slide rails. A sleeve groove is opened at the lower end of the safety cover plate. The cross-sectional area of ​​the sleeve groove is larger than the cross-sectional area of ​​the metal support shell. A cover groove is opened at the upper end of the safety cover plate in the compost box. A compost baffle is inserted in the cover groove. Several compost filter holes are opened through the lower end of the compost filter holes. A manual valve is horizontally inserted into one side of the metal support shell. The manual valve is connected to the lower end of one side of the plastic inner cylinder. When the lifting platform is at the bottom of the sinking cavity, the lower end of the compost box is higher than the upper end of the plastic inner cylinder. When the lifting platform is at the top of the sinking cavity, the manual valve is exposed in the sinking cavity.

[0014] Compared with the prior art, the beneficial effects of the present invention are: In use, this device transforms a traditional sunken water storage tank into multiple vertically movable plastic inner cylinders. During operation, the water collection component filters and collects rainwater that falls naturally near the planting area and rainwater collected from surrounding devices. This water then flows into the corresponding plastic inner cylinders via a water delivery channel. A lifting component allows the inner cylinders to move up and down. When utilizing rainwater, the raised inner cylinder allows rainwater to flow out naturally without the need for a water pump. Additionally, the composting box in the planting auxiliary component enables selective fertilization using collected rainwater, enriching the planting experience. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram showing the layout of the metal support shell of the present invention within the sinking cavity; Figure 3 For the present invention Figure 2 Schematic diagram of part A; Figure 4 This is a partial side-section structural diagram of the present invention; Figure 5 For the present invention Figure 4 Schematic diagram of part B; Figure 6 This is a schematic diagram of the connection between the water collection tank and the sinking cavity in this invention; Figure 7 For the present invention Figure 6Schematic diagram of part C; Figure 8 This is a schematic diagram of the internal structure of the sinking cavity of the present invention; Figure 9 For the present invention Figure 8 Schematic diagram of part D; Figure 10 This is a schematic diagram showing the positional relationship between the composting cover and the metal support shell of the present invention; Figure 11 This is a schematic diagram of the layout structure of the synchronous coupling of the present invention; Figure 12 This is a schematic diagram of the structure of the metal support shell extending into the sunken cavity of the present invention; Figure 13 For the present invention Figure 12 Schematic diagram of part E.

[0016] In the diagram: 1. Small concrete structure; 2. Sinking cavity; 3. Lifting trough; 4. Lifting platform; 5. Metal support shell; 6. Plastic inner cylinder; 7. Lifting steel cable; 8. Control groove; 9. Sealing support cover; 10. Synchronous coupling; 11. Winding turntable; 12. Driven bevel gear; 13. Driven bevel gear; 14. Protective cover; 15. Reversing wheel; 16. Lifting slide rail; 17. Guide pulley; 18. Water collection tank; 19. Filter support plate; 20. Filter cloth; 21. Water supply tank; 22. Water guide pipe; 23. Insert plate groove; 24. Selector insert plate; 25. Safety cover plate; 26. Socket groove; 27. Compost box; 28. Compost cover; 29. ​​Compost filter hole; 30. External drainage channel; 31. Bottom pad; 32. Side baffle; 33. Overlapping cover plate; 34. Manual valve; 35. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see the appendix Figures 1-13 This application provides the following technical solutions.

[0019] A water collection and utilization device for a green campus practical planting area includes a small concrete structure 1. Three sunken cavities 2 are evenly distributed on one side of the small concrete structure 1. A lifting platform 4 is movably installed in the sunken cavities 2 via a lifting assembly. A metal support shell 5 is pre-embedded at the upper end of the lifting platform 4. A plastic inner cylinder 6 is inserted into the metal support shell 5. The cross-sectional area of ​​the metal support shell 5 is smaller than the cross-sectional area of ​​the lifting platform 4. An external drainage channel 31 is horizontally connected below the three sunken cavities 2 in the small concrete structure 1. Two bottom pads 32 are horizontally arranged at the lower end of the sunken cavities 2, and the lower end of the lifting platform 4 is in contact with the upper end of the two bottom pads 32. The collected and filtered rainwater is collected in the plastic inner cylinder 6. The metal support shell 5 serves as a load-bearing support, and the plastic inner cylinder 6 is used for corrosion prevention and leakage prevention. When the plastic inner cylinder 6 overflows with rainwater, the rainwater is sprayed out from the upper end of the plastic inner cylinder 6, and then flows into the external drainage channel 31 from the gap between the bottom pads 32 and the sunken cavities 2 and is discharged into the municipal sewer pipe.

[0020] The lifting assembly includes two winding turntables 11, two lifting steel cables 7, and four lifting slide rails 17. The four lifting slide rails 17 are vertically installed on the four sides of the sunken cavity 2. The metal support shell 5 is slidably connected to the lifting slide rails 17. The four lifting slide rails 17 are vertically embedded on both sides of the sunken cavity 2. The metal support shell 5 and the lifting platform 4 are provided with guide pulleys 18 on the side near the lifting slide rails 17. One side of the guide pulleys 18 is connected to the lifting slide rails 17. The sunken cavity 2 has vertically opened lifting slots 3 on both sides. The lifting platform 4 is provided with lifting plates on both sides of the lifting slots 3. The lifting plates are horizontally inserted into the lifting slots 3. One end of each of the two lifting steel cables 7 is inserted into the lifting slots 3 and connected to the upper end of the lifting platform 4. The metal support shell 5 is connected to the lifting slide rails 17 through multiple guide pulleys 18, so that the metal support shell 5 can be vertically lifted and stably supported in the sunken cavity 2.

[0021] Two control grooves 8 are symmetrically provided on one side of the small concrete structure 1 located in the sinking cavity 2. The control grooves 8 between two adjacent sinking cavities 2 are shared. A synchronous coupling 10 is horizontally inserted between two adjacent control grooves 8 via bearings. A winding turntable 11 is sleeved on one side of the synchronous coupling 10 located in the control groove 8. A driven bevel gear 12 is sleeved on one side of the synchronous coupling 10, and the driven bevel gear 12 is located in the control groove 8. A sealing support cover 9 is provided above each control groove 8 via bolt sealing cover. A drive shaft 13 is vertically inserted into one side of the sealing support cover 9 via a dual drive control console. The lower end of the drive shaft 13 is inserted into the control groove 8 and is provided with a drive bevel gear 14. The drive bevel gear 14 is meshed with the driven bevel gear 12 on one side of the synchronous coupling 10. Protective covers 15 are horizontally provided above the control groove 8 and the small concrete structure 1 located in the lifting trough 3. The two protective covers 15 are joined on one side. Inside the housing 15, there are reversing wheels 16 that rotate via support shafts. The end of the lifting cable 7 away from the lifting plate passes through the protective housing 15 and is inserted into the control groove 8. The lifting cable 7 is connected to two reversing wheels 16 on one side inside the protective housing 15. The lifting cable 7 is wound on the take-up turntable 11 on the other side inside the control groove 8. By pulling and winding the lifting cable 7 through the take-up turntable 11, the lifting platform 4 can be lifted in conjunction with the two reversing wheels 16. This enables the lifting and lowering movement control of the lifting platform 4 and the metal support shell 5. The drive bevel gear 14 controls the rotation of the synchronous coupling shaft 10, which enables the two take-up turntables 11 to rotate synchronously, thereby lifting the lifting platform 4 from both sides. With the guidance and sliding of the four lifting slide rails 17 and the guide pulleys 18, stable lifting and lowering control is achieved. The dual-drive control console is based on the dual-drive control principle of motor control and manual control. It can use a dual-drive control device with a self-locking structure commonly found in existing technology, which is an existing technology product.

[0022] A water collection assembly is installed to collect rainwater from natural rainfall and the surrounding roof of the planting area. The assembly is located on the side of the small concrete structure 1 near the sunken cavity 2. The assembly includes a water collection trough 19, two filter support plates 20, and two filter cloths 21. The water collection trough 19 is connected to the sunken cavity 2 and is located on the upper side of the small concrete structure 1. Side baffles 33 are provided on both sides of the water collection trough 19. Two laying grooves are provided at the upper end of the water collection trough 19. The two filter support plates 20 are stacked and laid in the laying grooves of the water collection trough 19, and the two filter cloths 21 are laid horizontally between the two filter support plates 20. A water conveyance trough 22 is horizontally connected to the sunken cavity 2 within the water collection trough 19. A water guide pipe 23 is located on one side of the water conveyance trough 22 within the sunken cavity 2, and the water guide pipe 23 is close to and higher than the upper end of the metal support shell 5. The concrete structure 1 has a vertically formed insert groove 24 on one side of the water conveying channel 22. A selection insert 25 is inserted into the insert groove 24. The selection insert 25 has several fine filter holes at the position of the water conveying channel 22. The small concrete structure 1 is buried below ground. When rainwater from the roof and other sources passes through the collection channel 19, it is fully filtered by the two filter support plates 20 and the two filter cloths 21. After the filtered water flows into the collection channel 19, as the water level rises, it can flow from the water conveying channel 22 to the water guide pipe 23. Then, under the action of fluid inertia, it flows into the plastic inner cylinder 6 in a parabolic state. The setting of the selection insert 25 can work with the fine filter holes to further filter the rainwater, further reducing the possibility of sediment accumulation in the plastic inner cylinder 6. Alternatively, the water conveying channel 22 can be blocked by inserting the selection insert 25 without fine filter holes, preventing the rainwater in the collection channel 19 from entering the corresponding plastic inner cylinder 6.

[0023] A planting auxiliary component is installed to enable independent water and fertilizer production. This component, located above the sunken cavity 2, includes a safety cover 26 and a compost box 28. The compost box 28 is positioned directly above the plastic inner cylinder 6. Four overlapping cover plates 34 are symmetrically arranged on the upper sides of the safety cover 26. The lower ends of the safety cover 26 are inserted into the sunken cavity 2. The lower ends of the four overlapping cover plates 34 are horizontally positioned above the small concrete structure 1, covering four lifting slide rails 17. A connecting groove 27 is provided at the lower end of the safety cover 26, with a cross-sectional area larger than that of the metal support shell 5. A cover groove is connected to the upper end of the compost box 28, into which a compost baffle 29 is inserted. Several compost filter holes 30 are formed through the lower end of the compost filter holes 30. A manual valve 35 is horizontally inserted into one side of the metal support shell 5. The manual valve 35 is connected to the lower end of one side of the plastic inner cylinder 6. When the lifting platform 4 is at the bottom of the sunken cavity 2, the lower end of the compost box 28 is higher than the upper end of the plastic inner cylinder 6. When the lifting platform 4 is at the top of the sunken cavity 2, the manual valve 35 is exposed in the sunken cavity 2. When the manual valve 35 is exposed in the sunken cavity 2, a hose can be connected to one end of the manual valve 35. Using the gravity of the water in the plastic inner cylinder 6 which is higher than the horizontal plane, rainwater can flow out naturally to irrigate the plants in the planting area, replacing the use of traditional water pumps. At the same time, the metal support shell 5 and the plastic inner cylinder 6 raise the ground, making it convenient for operators to stand on the ground to clean the plastic inner cylinder 6. The large volume of the traditional water storage tank is divided into multiple independent plastic inner cylinders 6, which are convenient to operate and can be driven. Plant leaves and residues removed from the planting area can be placed in the compost box 28. Then, the lifting platform 4 and the plastic inner cylinder 6 are raised so that the lower end of the compost box 28 and the plant leaves inside are in the rainwater collected in the plastic inner cylinder 6. After a long period of soaking and fermentation, green water and fertilizer can be produced. The compost filter holes 30 can minimize the amount of residue entering the plastic inner cylinder 6. When the plastic inner cylinder 6 is raised, the water and fertilizer can flow out from the manual valve 35 for fertilizing the plants, while also enriching the campus practice. The safety cover plate 26 is designed with a lower sleeve groove 27. When the metal support shell 5 is raised, the upper end of the metal support shell 5 is inserted into the sleeve groove 27, and the safety cover plate 26 is raised together with the metal support shell 5. Conversely, when the metal support shell 5 is lowered to its maximum extent, the safety cover plate 26 overlaps with the small concrete structure 1 through the overlapping cover plate 34, and covers the lifting slide rail 17. At the same time, the safety cover plate 26 can prevent trainees from falling into the sinking cavity 2 and the plastic inner cylinder 6.

[0024] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A water collection and utilization device for a green campus practical plantation, characterized in that, include: A small concrete structure (1) has three sunken cavities (2) evenly opened on one side. A lifting platform (4) is movably provided in the sunken cavity (2) through a lifting assembly. A metal support shell (5) is pre-embedded at the upper end of the lifting platform (4). The lifting assembly includes two winding turntables (11), two lifting steel cables (7) and four lifting slide rails (17). The four lifting slide rails (17) are respectively vertically arranged on the four sides of the sunken cavity (2). The metal support shell (5) is slidably connected to the lifting slide rails (17). The water collection assembly is located on the side of the small concrete structure (1) near the sinking cavity (2). The water collection assembly includes a water collection tank (19), two filter support plates (20) and two filter cloths (21). The water collection tank (19) is connected to the sinking cavity (2). The planting auxiliary component is located above the sunken cavity (2). The planting auxiliary component includes a safety cover plate (26) and a compost box (28), which is located directly above the plastic inner cylinder (6).

2. The water collection and utilization device for a green campus practical planting area according to claim 1, characterized in that: A plastic inner cylinder (6) is inserted into the metal support shell (5). The cross-sectional area of ​​the metal support shell (5) is smaller than that of the lifting platform (4). The small concrete structure (1) is located below the three sinking cavities (2) and is horizontally connected with an external drainage channel (31). Two bottom pads (32) are horizontally provided at the lower end of the sinking cavity (2), and the lower end of the lifting platform (4) is in contact with the upper end of the two bottom pads (32).

3. The water collection and utilization device for a green campus practical planting area according to claim 2, characterized in that: The four lifting slide rails (17) are vertically embedded on both sides of the sunken cavity (2). The metal support shell (5) and the lifting platform (4) are provided with guide pulleys (18) on the side near the lifting slide rails (17). One side of the guide pulleys (18) is connected to the lifting slide rails (17).

4. The water collection and utilization device for a green campus practical planting area according to claim 3, characterized in that: The sinking cavity (2) has vertically opened lifting slots (3) on both sides. The lifting platform (4) is located on both sides of the lifting slots (3) and has lifting plates. The lifting plates are horizontally inserted into the lifting slots (3). One end of each of the two lifting steel cables (7) is inserted into the lifting slots (3) and connected to the upper end of the lifting platform (4).

5. A water collection and utilization device for a green campus practical planting area according to claim 4, characterized in that: The small concrete structure (1) has two symmetrical control grooves (8) on one side of the sinking cavity (2). The control grooves (8) between two adjacent sinking cavities (2) are shared. A synchronous coupling (10) is horizontally inserted between two adjacent control grooves (8) through a bearing. A winding turntable (11) is sleeved on one side of the synchronous coupling (10) inside the control groove (8). A driven bevel gear (12) is sleeved on one side of the synchronous coupling (10), and the driven bevel gear (12) is located inside the control groove (8).

6. A water collection and utilization device for a green campus practical planting area according to claim 5, characterized in that: The control groove (8) is provided with a sealing support cover (9) above it by a bolt sealing cover. A drive shaft (13) is vertically inserted into one side of the sealing support cover (9) through a dual drive control console. The lower end of the drive shaft (13) is inserted into the control groove (8) and is provided with a drive bevel gear (14). The drive bevel gear (14) is meshed with the driven bevel gear (12) on one side of the synchronous coupling shaft (10).

7. A water collection and utilization device for a green campus practical planting area according to claim 6, characterized in that: The control groove (8) and the small concrete structure (1) are both horizontally equipped with protective covers (15) above the lifting groove (3). The two protective covers (15) are connected on one side. The two protective covers (15) are equipped with reversing wheels (16) through the support shaft. The end of the lifting cable (7) away from the lifting plate passes through the protective cover (15) and is inserted into the control groove (8). The side of the lifting cable (7) inside the protective cover (15) overlaps with the two reversing wheels (16). The side of the lifting cable (7) inside the control groove (8) is wound on the winding turntable (11).

8. A water collection and utilization device for a green campus practical plantation according to claim 7, characterized in that: The water collection tank (19) is located on the upper side of the small concrete structure (1). The small concrete structure (1) is provided with side baffles (33) on both sides of the water collection tank (19). Two laying grooves are opened at the upper end of the water collection tank (19). Two filter support plates (20) are stacked and laid in the laying groove of the water collection tank (19). Two filter cloths (21) are laid horizontally between the two filter support plates (20).

9. A water collection and utilization device for a green campus practical planting area according to claim 8, characterized in that: The water collection tank (19) is horizontally connected to the sinking cavity (2) and a water conveying tank (22) is provided. A water guide pipe (23) is provided on one side of the water conveying tank (22) in the sinking cavity (2). The water guide pipe (23) is close to the metal support shell (5) and higher than the upper end of the metal support shell (5). A small concrete structure (1) is vertically provided with a plate slot (24) on one side of the water conveying tank (22). A selection plate (25) is inserted into the plate slot (24). The selection plate (25) is provided with several fine filter holes at the position of the water conveying tank (22).

10. A water collection and utilization device for a green campus practical planting area according to claim 9, characterized in that: The safety cover (26) has four overlapping cover plates (34) symmetrically arranged on the upper ends of both sides. The lower end of the safety cover (26) is inserted into the recessed cavity (2). The lower ends of the four overlapping cover plates (34) are horizontally placed on the upper end of the small concrete structure (1). The four overlapping cover plates (34) cover the four lifting slide rails (17). The lower end of the safety cover (26) is provided with a sleeve groove (27). The cross-sectional area of ​​the sleeve groove (27) is larger than the cross-sectional area of ​​the metal support shell (5). The safety cover (26) is located at the upper end of the compost box (28) and connected to the opening. A cover groove is provided, and a composting cover (29) is inserted into the cover groove. Several composting filter holes (30) are opened through the lower end of the composting filter hole (30). A manual valve (35) is horizontally inserted into one side of the metal support shell (5). The manual valve (35) is connected to the lower end of one side of the plastic inner cylinder (6). When the lifting platform (4) is at the bottom of the sinking cavity (2), the lower end of the composting box (28) is higher than the upper end of the plastic inner cylinder (6). When the lifting platform (4) is at the top of the sinking cavity (2), the manual valve (35) is exposed in the sinking cavity (2).

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