A garbage can with replaceable inner barrel

By installing an odor-blocking and absorbing device at the garbage bin's disposal opening, and using a mixture of activated carbon and diatomaceous earth to absorb garbage odors, the problem of odor escape from traditional garbage bins is solved, achieving both deodorization and convenient use of the garbage bin.

CN224577242UActive Publication Date: 2026-07-31HEBEI GUANGHUI SANITATION EQUIP MFG CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
HEBEI GUANGHUI SANITATION EQUIP MFG CO LTD
Filing Date
2025-07-22
Publication Date
2026-07-31

AI Technical Summary

Technical Problem

Traditional garbage bins are open or have simple covers. When garbage is stored, the foul odor produced by the decomposition of decaying organic matter can escape indiscriminately, polluting the air and breeding bacteria, which affects residents' living experience and the hygiene of public areas.

Method used

Design a trash can that facilitates the replacement of the inner bin. It adopts an odor blocking and absorption device at the trash can's disposal opening, which uses a mixture of activated carbon and diatomaceous earth to absorb the odor from the trash. The device also achieves convenient trash disposal and odor control through a lifting slider and chute structure.

Benefits of technology

It effectively prevents odors from spreading inside the trash can, reduces air pollution, improves environmental hygiene, is easy to operate, and combines deodorization with ease of use.

✦ Generated by Eureka AI based on patent content.

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    Figure CN224577242U_ABST
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Abstract

This utility model discloses a trash can with an easily replaceable inner bin, including a base and a partition plate located at the top center of the front end of the base. The partition plate is fixed vertically upward at the top of the base. A right side plate is located at the top right end of the base, and a left side plate is located at the top left end of the base. Both the right and left side plates are fixed vertically upward on the base. By adding a novel odor blocking and absorption device above the trash can's disposal opening, when no trash is being disposed of, the square odor blocking box is closed at the top of the reinforcing metal strip. This not only physically blocks the spread of odors but also allows odors to pass through the slot, where the mixture of activated carbon and diatomaceous earth inside the box absorbs the odors, thus achieving dual deodorization and environmental optimization. When trash needs to be disposed of, simply pull the lifting handle to slide the square odor blocking box upward, revealing the disposal space. The operation is simple, balancing deodorization and ease of use, achieving a win-win situation for both function and user experience.
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Description

Technical Field

[0001] This utility model belongs to the technical field of environmental sanitation engineering, specifically relating to a trash can with an easily replaceable inner container. Background Technology

[0002] In urban environmental sanitation management and residents' daily lives, trash cans serve as crucial temporary waste storage facilities. However, traditional trash cans often employ open or simply covered structures. During waste storage, the continuous decomposition of decaying organic matter produces malodorous gases such as hydrogen sulfide, ammonia, and volatile organic acids. These odors diffuse indiscriminately through the disposal openings, severely polluting the surrounding air environment, affecting residents' living experience and the cleanliness of public areas, and attracting flies and mosquitoes, breeding bacteria, and exacerbating hygiene risks. The problem of odor diffusion becomes even more severe during hot seasons or when trash is overflowing, posing a significant challenge to environmental management in communities and public places. Utility Model Content

[0003] The purpose of this utility model is to provide a trash can with an easily replaceable inner bin, in order to solve the problems mentioned in the background art. Traditional trash cans are mostly open or have simple covered structures. When garbage is stored, the decomposition of decaying organic matter produces malodorous gases such as hydrogen sulfide and ammonia, which will indiscriminately escape through the disposal opening, seriously polluting the surrounding air, affecting residents' lives and the cleanliness of public areas, and also easily attracting mosquitoes and flies, breeding bacteria, and exacerbating hygiene hazards.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a trash can that facilitates the replacement of the inner bin, comprising a base and a partition plate disposed at the top center of the front end of the base. The partition plate is fixed vertically upward at the top of the base. A right side plate is disposed at the top right end of the base, and a left side plate is disposed at the top left end of the base. Both the right and left side plates are fixed vertically upward on the base. A top cover is connected to the top of the left and right side plates. A back plate is also fixed at the top rear end of the base. The left and right ends of the back plate are fixedly connected to the left and right side plates, respectively. Reinforcing metal strips are horizontally fixed at the top of the back plate and the top of the partition plate. The left and right ends of the reinforcing metal strips are fixedly connected to the left and right side plates, respectively. A trash can A is disposed on the right side of the top center of the base, and a trash can B is disposed on the left side of the top center of the base. The top openings of both trash can A and trash can B are located below the area between the two reinforcing metal strips. Odor blocking and absorption devices are disposed above the openings of both trash can A and trash can B. The two odor blocking and absorption devices are symmetrically arranged.

[0005] Preferably, the odor blocking and absorption device above the trash can B includes a lifting chute A, a square odor blocking box, a support plate, a lifting chute B, a lifting slider A, and a lifting slider B. The bottom end of the support plate is fixedly connected to the left side of the center of the top of two reinforcing metal strips, and the top end of the support plate is fixedly connected to the top cover. Lifting chute B is vertically arranged on both the front and rear sides of the center of the support plate. Lifting chute A is vertically arranged on both the front and rear sides of the center of the left side plate. The two lifting chute A and the two lifting chute B are symmetrically arranged. A square odor blocking box is arranged between the support plate and the left side plate, and the square odor blocking box is located above the trash can B. Lifting slider B is arranged on both the front and rear sides of the center of the right end of the square odor blocking box. The two lifting sliders B are respectively inserted into the two lifting chute B. Lifting slider A is arranged on both the front and rear sides of the center of the left end of the square odor blocking box. The two lifting sliders A are respectively inserted into the two lifting chute A.

[0006] Preferably, the odor blocking and absorbing device further includes lifting handles and anti-detachment baffles. Anti-detachment baffles are fixed to the left ends of the two lifting sliders A and the right ends of the two lifting sliders B. Multiple anti-detachment baffles block the left end of the left side plate and the right end of the support plate, respectively. Lifting handles are provided on the outer walls of the front and rear ends of the square odor blocking box. The lifting handles can drive the square odor blocking box to move up and down, and the lifting sliders A and B move up and down synchronously in the lifting slide grooves A and B, respectively.

[0007] Preferably, the odor blocking and absorption device further includes a sealed top plate, odor passage slots, and garbage odor absorption packs. The top of the square odor blocking box is provided with a sealed top plate, and the sealed top plate is fixedly connected to the square odor blocking box by screws. Multiple odor passage slots are evenly spaced inside the bottom of the square odor blocking box. Garbage odor absorption packs are placed inside the square odor blocking box.

[0008] Preferably, when the square odor blocking box is lowered to its lowest state, the bottom of the square odor blocking box contacts the outer wall of the top of the two reinforcing metal strips respectively. The odor can pass through the slot normally, allowing the odor emitted by the garbage inside the garbage can B to pass through normally. The garbage odor passing through the slot is absorbed in time by the garbage odor absorption bag, which is filled with a mixture of activated carbon and diatomaceous earth.

[0009] Preferably, a battery and cigarette butt disposal window is fixed inside the upper side of the center of the partition plate, a battery and cigarette butt storage bin is provided at the bottom rear side of the battery and cigarette butt disposal window, and a trash can fixing sleeve is fixed at the top center of the base and on the left and right sides.

[0010] Preferably, the bottom end of the battery cigarette butt storage bin is inserted into the trash can fixing sleeve at the center of the top of the base, and the top opening of the battery cigarette butt storage bin is located below the battery cigarette butt disposal window. The bottom end of trash can A is inserted into the trash can fixing sleeve on the right side of the center of the top of the base, and the bottom end of trash can B is inserted into the trash can fixing sleeve on the left side of the center of the top of the base.

[0011] Preferably, protective doors are provided between the middle partition and the left side panel, and between the middle partition and the right side panel. The protective doors are also located between the base and the reinforcing metal strip. Both protective doors are rotatably connected to the left side panel and the right side panel respectively by metal hinges.

[0012] Preferably, trash can A and trash can B are located on the rear side of the two protective doors, and the two protective doors are also equipped with door locks. After the two protective doors are rotated and closed to the area between the middle partition and the left side panel and the area between the middle partition and the right side panel, the two protective doors can be locked by the door locks to prevent the protective doors from being opened accidentally.

[0013] Compared with the prior art, this utility model provides a trash can with an easy-to-replace inner bin, which has the following beneficial effects:

[0014] This invention adds a novel odor-blocking and absorbing device above the two trash can openings of a trash can designed for easy replacement of the inner bin. When the user is not disposing of trash in the inner bin, the square odor-blocking box of this device is closed at the top of the reinforcing metal strip, directly preventing odors from spreading outwards. At the same time, odors from inside the trash can are absorbed by the odor-absorbing pack filled with a mixture of activated carbon and diatomaceous earth inside the box through the odor passage. This dual effect significantly reduces odor escape and optimizes the odor of the surrounding environment. When trash needs to be disposed of, the square odor-blocking box can be easily slid upwards using the lifting handle, fully exposing the trash disposal space. The operation is convenient and does not affect the normal trash disposal process, balancing deodorization and ease of use. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of a trash can in its closed state that facilitates the replacement of the inner bin, according to the present invention.

[0016] Figure 2 This is a front view schematic diagram of a trash can with an inner bucket that is easy to replace, according to the present invention.

[0017] Figure 3 This is a three-dimensional structural diagram of a trash can with an open state that facilitates the replacement of the inner bin, according to the present invention.

[0018] Figure 4 This is a three-dimensional structural diagram of the odor blocking and absorbing device of this utility model in the state of garbage being placed.

[0019] Figure 5 This is a three-dimensional disassembly diagram of the odor blocking and absorption device of this utility model.

[0020] In the diagram: 1. Base; 2. Right side panel; 3. Protective door; 4. Middle partition; 5. Battery and cigarette butt disposal window; 6. Reinforcing metal strip; 7. Left side panel; 8. Odor blocking and absorption device; 9. Top cover; 10. Trash can A; 11. Battery and cigarette butt storage bin; 12. Trash can fixing sleeve; 13. Trash can B; 14. Lifting slide A; 15. Square odor blocking box; 16. Lifting handle; 17. Sealed top plate; 18. Support plate; 19. Lifting slide B; 20. Lifting slider A; 21. Odor passage opening; 22. Trash odor absorption bag; 23. Lifting slider B; 24. Anti-detachment baffle. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] This utility model provides, for example Figure 1-5The trash can shown includes a base 1 and a partition 4 located at the center of the top front of the base 1. The partition 4 is fixed vertically upward at the top of the base 1. A right side plate 2 is located at the top right end of the base 1, and a left side plate 7 is located at the top left end of the base 1. Both the right side plate 2 and the left side plate 7 are fixed vertically upward on the base 1. A top cover 9 is connected to the top of the left side plate 7 and the right side plate 2. A back plate is also fixed at the top rear end of the base 1. The left and right ends of the back plate are fixedly connected to the left side plate 7 and the right side plate 2, respectively. Reinforcing metal strips 6 are horizontally fixed to the top of the back plate and the top of the partition 4. The left and right ends of the reinforcing metal strips 6 are fixedly connected to the left side plate 7 and the right side plate 2, respectively. The base 1, the left side plate 7, the right side plate 2, the back plate, and the top cover 9 are interconnected to form a stable frame. The partition 4 and the reinforcing metal strips 6 further strengthen the structure and ensure the overall strength of the trash can, providing a secure inner bin. The placement and odor blocking and absorption device 8 provides reliable support. A trash can A10 is located on the right side of the top center of the base 1, and a trash can B13 is located on the left side of the top center of the base 1. The top openings of trash cans A10 and B13 are both located below the area between the two reinforcing metal strips 6. Protective doors 3 are provided between the partition 4 and the left side plate 7, and between the partition 4 and the right side plate 2. The protective doors 3 are also located between the base 1 and the reinforcing metal strips 6. The two protective doors 3 are rotatably connected to the left side plate 7 and the right side plate 2 respectively by metal hinges. Trash cans A10 and B13 are located behind the two protective doors 3. The two protective doors 3 are also equipped with door locks. After the two protective doors 3 are rotated and closed to the area between the partition 4 and the left side plate 7 and the right side plate 2 respectively, the two protective doors 3 can be locked by the door locks to prevent the protective doors 3 from being opened accidentally.

[0023] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, a battery and cigarette butt disposal window 5 is fixed inside the upper side of the center of the partition 4. A battery and cigarette butt storage bin 11 is set at the bottom rear side of the battery and cigarette butt disposal window 5. Trash can fixing sleeves 12 are fixed at the center of the top of the base 1 and on both sides. The bottom end of the battery and cigarette butt storage bin 11 is inserted into the trash can fixing sleeve 12 at the center of the top of the base 1, and the top opening of the battery and cigarette butt storage bin 11 is located below the battery and cigarette butt disposal window 5. The bottom end of trash can A10 is inserted into the trash can fixing sleeve 12 on the right side of the center of the top of the base 1, and the bottom end of trash can B13 is inserted into the trash can fixing sleeve 12 on the left side of the center of the top of the base 1. The trash cans are fixed by the trash can fixing sleeves 12 at the top of the base 1 to limit and fix the trash can A10, trash can B13 and battery and cigarette butt storage bin 11, ensuring their stable position during use. When it is necessary to replace the inner bin, the protective door 3 is opened, and the bottom end of the inner bin is inserted into the... The old bin can be easily removed and the new bin inserted directly from the fixed sleeve, making operation simple and enabling quick replacement. When using this trash can that facilitates inner bin replacement, the square odor blocking box 15 of the odor blocking and absorption device 8 is in its lowest lowered state, closed at the top of the reinforcing metal strip 6, preventing the spread of odor from the trash can. The odor is absorbed by the absorption bag through the slot. When disposing of trash, hold the lifting handle 16 and slide the square odor blocking box 15 upwards, allowing it to rise along the lifting chute and fully expose the trash disposal space. Put the trash into the corresponding trash can (trash can A10 or trash can B13). After disposal, slide it back down using the lifting handle 16. When it is necessary to replace trash can A10, trash can B13, or the battery and cigarette butt storage bin 11, open the lock of the protective door 3, rotate to open the protective door 3, remove the old inner bin upwards, insert the bottom of the new inner bin into the corresponding trash can fixed sleeve 12, close the protective door 3, and lock the lock.

[0024] like Figure 1 , Figure 4 and Figure 5As shown, odor blocking and absorption devices 8 are installed above the openings of trash cans A10 and B13. The two odor blocking and absorption devices 8 are symmetrically arranged. The odor blocking and absorption device 8 above trash can B13 includes a lifting slide A14, a square odor blocking box 15, a support plate 18, a lifting slide B19, a lifting slider A20, and a lifting slider B23. The bottom end of the support plate 18 is fixedly connected to the left side of the center of the top of the two reinforcing metal strips 6, and the top end of the support plate 18 is fixedly connected to the top cover 9. Lifting slides B19 are vertically arranged on the front and rear sides inside the center of the support plate 18. Lifting slides B19 are vertically arranged on the front and rear sides inside the center of the left side plate 7. The sluice gate A14 and two lifting sluice gates B19 are symmetrically arranged. A square odor blocking box 15 is installed between the support plate 18 and the left side plate 7, and the square odor blocking box 15 is located above the garbage can B13. Lifting sliders B23 are installed on both the front and rear sides of the center right end of the square odor blocking box 15, and the two lifting sliders B23 are respectively inserted into the two lifting sluice gates B19. Lifting sliders A20 are installed on both the front and rear sides of the center left end of the square odor blocking box 15, and the two lifting sliders A20 are respectively inserted into the two lifting sluice gates A14. When no garbage is disposed of, the square odor blocking box 15 is lowered to its lowest position, with its bottom end aligned with the center of the garbage can B13. The top of the reinforcing metal strip 6 contacts the trash can, forming a physical barrier above the trash can's opening, directly blocking the odor from spreading outwards and reducing the odor escape pathways. The odor blocking and absorption device 8 also includes a lifting handle 16 and anti-detachment baffles 24. Anti-detachment baffles 24 are fixed to the left ends of the two lifting sliders A20 and the right ends of the two lifting sliders B23. Multiple anti-detachment baffles 24 are respectively blocked at the left end of the left side plate 7 and the right end of the support plate 18. Lifting handles 16 are provided on the outer walls of both the front and rear ends of the square odor blocking box 15. The lifting handles 16 can drive the square odor blocking box 15 to move up and down. The lifting sliders A20 and B23 are respectively located in the lifting grooves. The square odor-blocking box 15 moves up and down synchronously within lifting channels A14 and B19. The lifting handle 16 drives the box, and lifting sliders A20 and B23 slide within these channels respectively, allowing the box to move up and down. When garbage needs to be disposed of, the box moves upward to expose the disposal space; after disposal, it moves downward to its original position, restoring its odor-blocking and absorption functions. This meets different usage and deodorization needs. The lifting sliders and channels work together to ensure smooth up-and-down movement of the square odor-blocking box 15. The anti-detachment baffle 24 effectively prevents the sliders from detaching from the channels, improving the structural stability and service life of the device and ensuring long-term reliable deodorization.

[0025] like Figure 1 , Figure 4 and Figure 5As shown, the odor blocking and absorption device 8 also includes a sealed top plate 17, odor passage slots 21, and garbage odor absorption packs 22. The top of the square odor blocking box 15 is equipped with a sealed top plate 17, which is fixedly connected to the square odor blocking box 15 by screws. The sealed top plate 17 is fixed by screws, facilitating easy opening and replacement of the internal garbage odor absorption packs 22, ensuring continuous and stable deodorization effect, and reducing the difficulty and cost of later maintenance. Multiple odor passage slots 21 are evenly spaced inside the bottom of the square odor blocking box 15. Garbage odor absorption packs 22 are placed inside the square odor blocking box 15. When the square odor blocking box 15 is lowered to its lowest position, the square odor... The bottom of the blocking box 15 contacts the outer wall of the top of the two reinforcing metal strips 6 respectively. Odors can pass through the slot 21 to allow the odors emitted from the garbage inside the garbage can B13 to pass through normally. The garbage odors passing through the slot 21 are absorbed in time by the garbage odor absorption pack 22. The garbage odor absorption pack 22 is filled with a mixture of activated carbon and diatomaceous earth. Odor molecules in the garbage can can enter the box through the odor slot 21 at the bottom of the square odor blocking box 15. The garbage odor absorption pack 22, which is filled with a mixture of activated carbon and diatomaceous earth, uses the porous structure of activated carbon and the adsorption properties of diatomaceous earth to physically adsorb the odor molecules and lock them in the box, thereby achieving odor purification.

[0026] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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 trash can for easy replacement of the inner bin, comprising a base (1) and a partition (4) disposed at the center of the top front end of the base (1), the partition (4) being fixed vertically upward at the top of the base (1), a right side plate (2) being disposed at the top right end of the base (1), and a left side plate (7) being disposed at the top left end of the base (1), both the right side plate (2) and the left side plate (7) being fixed vertically upward on the base (1), and a top cover (9) being connected to the top of the left side plate (7) and the right side plate (2), characterized in that: The base (1) is also fixed with a back plate at the top rear end. The left and right ends of the back plate are fixedly connected to the left side plate (7) and the right side plate (2) respectively. The top of the back plate and the top of the middle partition (4) are both fixed with a reinforcing metal strip (6). The left and right ends of the reinforcing metal strip (6) are fixedly connected to the left side plate (7) and the right side plate (2) respectively. A trash can A (10) is set on the right side of the top center of the base (1). A trash can B (13) is set on the left side of the top center of the base (1). The top openings of the trash can A (10) and the trash can B (13) are both located below the area between the two reinforcing metal strips (6). An odor blocking and absorption device (8) is set above the openings of the trash can A (10) and the trash can B (13). The two odor blocking and absorption devices (8) are symmetrically arranged. The odor blocking and absorption device (8) above the trash can B (13) includes a lifting chute A (14), a square odor blocking box (15), a support plate (18), a lifting chute B (19), a lifting slider A (20), and a lifting slider B (23). The bottom end of the support plate (18) is fixedly connected to the left side of the center of the top of two reinforcing metal strips (6), and the top of the support plate (18) is fixedly connected to the top cover (9). Lifting chute B (19) is vertically arranged inside the front and rear sides of the center of the support plate (18). Lifting chute A (14) is vertically arranged inside the front and rear sides above the center of the left side plate (7). The two lifting chute A (14) is symmetrically arranged between the two lifting slides B (19). A square odor blocking box (15) is arranged between the support plate (18) and the left side plate (7). The square odor blocking box (15) is located above the trash can B (13). Lifting sliders B (23) are arranged on both the front and back sides of the center of the right end of the square odor blocking box (15). The two lifting sliders B (23) are respectively inserted into the two lifting slides B (19). Lifting sliders A (20) are arranged on both the front and back sides of the center of the left end of the square odor blocking box (15). The two lifting sliders A (20) are respectively inserted into the two lifting slides A (14).

2. The trash receptacle of claim 1, wherein: The odor blocking and absorption device (8) also includes a lifting handle (16) and an anti-detachment baffle (24). The left ends of the two lifting sliders A (20) and the right ends of the two lifting sliders B (23) are all fixed with anti-detachment baffles (24). The multiple anti-detachment baffles (24) block the left end of the left side plate (7) and the right end of the support plate (18) respectively. The outer walls of the front and rear ends of the square odor blocking box (15) are provided with lifting handles (16). The square odor blocking box (15) can be driven to move up and down through the lifting handles (16). The lifting sliders A (20) and B (23) move up and down synchronously in the lifting grooves A (14) and B (19) respectively.

3. The trash receptacle of claim 2, wherein: The odor blocking and absorption device (8) also includes a sealing top plate (17), odor passage slots (21), and garbage odor absorption packs (22). The top of the square odor blocking box (15) is provided with a sealing top plate (17), and the sealing top plate (17) is fixedly connected to the square odor blocking box (15) by screws. Multiple odor passage slots (21) are evenly distributed inside the bottom of the square odor blocking box (15). The garbage odor absorption packs (22) are placed inside the square odor blocking box (15).

4. The trash receptacle of claim 3, wherein: When the square odor blocking box (15) is lowered to its lowest state, the bottom of the square odor blocking box (15) contacts the top outer wall of the two reinforcing metal strips (6). The odor can pass through the slot (21) to allow the odor emitted from the garbage inside the garbage can B (13) to pass through normally. The garbage odor that passes through the slot (21) is absorbed by the garbage odor absorption pack (22) in time. The garbage odor absorption pack (22) is filled with a mixture of activated carbon and diatomaceous earth.

5. The trash receptacle of claim 1, wherein: A battery cigarette butt disposal window (5) is fixed inside the upper side of the center of the partition plate (4). A battery cigarette butt storage bin (11) is provided at the bottom rear side of the battery cigarette butt disposal window (5). A trash can fixing sleeve (12) is fixed at the top center of the base (1) and on the left and right sides.

6. The trash receptacle of claim 5, wherein: The bottom end of the battery cigarette butt storage bin (11) is inserted into the trash can fixing sleeve (12) at the center of the top of the base (1), and the top opening of the battery cigarette butt storage bin (11) is located below the battery cigarette butt disposal window (5). The bottom end of the trash can A (10) is inserted into the trash can fixing sleeve (12) on the right side of the center of the top of the base (1), and the bottom end of the trash can B (13) is inserted into the trash can fixing sleeve (12) on the left side of the center of the top of the base (1).

7. The trash receptacle of claim 6, wherein: Protective doors (3) are provided between the middle partition (4) and the left side panel (7) and between the middle partition (4) and the right side panel (2). The protective doors (3) are also located between the base (1) and the reinforcing metal strip (6). The two protective doors (3) are rotatably connected to the left side panel (7) and the right side panel (2) respectively by metal hinges.

8. The trash receptacle of claim 7, wherein: The trash can A (10) and trash can B (13) are located on the rear side of the two protective doors (3). The two protective doors (3) are also equipped with door locks. After the two protective doors (3) are rotated and closed to the area between the middle partition (4) and the left side plate (7) and the area between the middle partition (4) and the right side plate (2), the two protective doors (3) can be locked by the door locks to prevent the protective doors (3) from being opened accidentally.