A liftable double-layer garbage can

Abstract

The utility model discloses a liftable double -deck garbage can includes: outer tube, inner tube, outer rod, inner rod, elastic mechanism and a plurality of limit stop piece. Outer tube is equipped with the accommodation groove, inner tube liftable is located in the accommodation groove, outer rod is equipped with the lifting groove, and the inner wall top side of lifting groove is equipped with the fixed block and a plurality of tines that are spaced apart upwards and downwards and are evenly distributed in the circumference, every fixed block includes guide inclined along with limit along, and guide inclined along with limit along together enclose and form fixed groove, inner rod rotates and is established on the inner tube, and one end stretches into the lifting groove, elastic mechanism drives inner rod to go up, a plurality of limit stop pieces evenly distribute in the circumference in the top side of inner rod, and every limit stop piece includes upper top corner part, lower top corner part and upper inclined along with lower inclined along, the utility model discloses has realized two kinds of state of tall and short, can adapt to the sitting posture state of human body, also can adapt to the standing state of human body, has promoted the application range of product, and has guaranteed the comfort degree of user when using in each scene.

Description

Technical Field

[0001] This utility model relates to the field of trash can technology, and in particular to a liftable double-layer trash can. Background Technology

[0002] Existing trash cans are typically designed in two heights, either tall or short, to accommodate different needs such as standing or sitting. For example, taller trash cans are often needed next to kitchen countertops (these can be placed on the ground due to their inherent height, or mounted on walls or cabinets via hanging or adhesive methods), allowing people to easily dispose of waste after washing or chopping vegetables while standing, reducing the number of times and the extent of bending over. Conversely, shorter trash cans are needed in situations where people are seated, such as near coffee tables or toilets, to allow them to easily dispose of trash without having to stand up.

[0003] However, existing trash cans cannot be height-adjusted, failing to meet the needs of different scenarios. In other words, a single trash can cannot simultaneously accommodate the needs of a person in both standing and sitting positions while disposing of trash, and cannot guarantee user comfort in all situations. Therefore, it is necessary to provide a height-adjustable double-layered trash can to overcome these shortcomings. Utility Model Content

[0004] The purpose of this invention is to provide a height-adjustable double-layer trash can, which aims to improve the problem that existing trash cans cannot be adjusted in height, so as to meet the needs of people throwing away trash in both standing and sitting postures, and to ensure the comfort of users in various scenarios.

[0005] To achieve the above objectives, this utility model provides a liftable double-layer trash can, comprising:

[0006] The outer cylinder is provided with a receiving groove;

[0007] Inner cylinder, which can be lifted and lowered within the receiving groove;

[0008] An outer rod is provided on the outer cylinder and has a lifting groove. The top side of the inner wall of the lifting groove is provided with a plurality of fixing blocks and a plurality of sharp teeth that are evenly distributed circumferentially at intervals. Each fixing block includes a guide edge and a limiting edge, and the bottom side of the guide edge and the limiting edge together form a fixing groove.

[0009] An inner rod is rotatably mounted on the inner cylinder, with one end extending into the lifting groove;

[0010] An elastic mechanism is provided in the lifting groove and abuts against the bottom of the inner rod to drive the inner rod to rise;

[0011] Multiple limiting blocks are evenly distributed circumferentially on the top side of the inner rod and are corresponding one-to-one with the fixing blocks; each limiting block includes an upper top corner, a lower top corner, an upper inclined edge, and a lower inclined edge;

[0012] When the inner cylinder is pressed, the lower top corner first descends along the top side of the guide slope to drive the inner rod to rotate in the forward direction. Then, the lower slope abuts against the pointed tooth and descends to drive the inner rod to rotate in the reverse direction. After the pressure on the inner rod is released, the elastic mechanism drives the inner rod to rise, and the upper top corner or the upper slope abuts against the bottom side of the guide slope to make the inner rod continue to rotate in the reverse direction until the upper top corner is engaged in the fixing groove.

[0013] When the inner cylinder is pressed again, the lower inclined edge abuts against the adjacent pointed teeth and descends to drive the inner rod to rotate in the opposite direction; after the pressure on the inner rod is released, the elastic mechanism drives the inner rod to rise, and the upper inclined edge abuts against the bottom side of the limiting edge to make the inner rod continue to rotate in the opposite direction until the limiting block passes through the gap between the two fixed blocks and rises.

[0014] In a preferred embodiment, each of the limiting blocks further includes a third apex; the third apex, the upper apex, and the lower apex together form a triangle; the upper oblique edge is located between the upper apex and the third apex, the lower oblique edge is located between the lower apex and the third apex, and the lengths of the upper oblique edge and the lower oblique edge are the same.

[0015] In a preferred embodiment, the upper corner portion and the lower corner portion are spaced vertically apart along the axial direction of the inner rod.

[0016] In a preferred embodiment, the inner wall of the lifting groove is provided with a fixed edge along the circumference, and the plurality of sharp teeth are evenly distributed on the fixed edge; wherein, half of the sharp teeth are located below the fixed groove, and the other half of the sharp teeth are located below the gap between two adjacent fixed blocks.

[0017] In a preferred embodiment, the limiting edge is arranged along the axial direction of the lifting groove, and its bottom end is located on the same cross-section as the bottom end of the guide edge.

[0018] In a preferred embodiment, a lower sealing wall is vertically provided at one end of the inner rod that extends into the lifting groove, and the periphery of the lower sealing wall abuts against the inner wall of the lifting groove; the inner wall of the lifting groove is also provided with an upper sealing ring located below the pointed tooth, and a portion of the outer surface of the inner rod abuts against the inner wall of the upper sealing ring; the outer diameter of the lower sealing wall is larger than the inner diameter of the upper sealing ring.

[0019] In a preferred embodiment, the elastic mechanism is an air chamber formed by closing the portion of the lifting groove away from the inner cylinder through the lower sealing wall; a first sealing ring is sleeved on the periphery of the lower sealing wall, and a second sealing ring is nested on the inner wall of the upper sealing ring.

[0020] In a preferred embodiment, the elastic mechanism is a compression spring disposed between the bottom of the lifting groove and the lower sealing wall.

[0021] In a preferred embodiment, the inner cylinder has a connecting groove on the side away from the outer cylinder; the bottom of the connecting groove has a rotating hole with a diameter smaller than the cross-sectional diameter of the inner rod; the end of the inner rod away from the outer cylinder is coaxially provided with a screw, one end of the screw passes through the rotating hole and is screwed with a nut, the bottom side of the nut touches the bottom of the connecting groove so that the screw can rotate along its own central axis within the rotating hole.

[0022] In a preferred embodiment, the inner wall of the receiving groove is provided with at least one guide groove along the lifting direction of the inner cylinder, and the outer wall of the inner cylinder is provided with a guide rail corresponding to the guide groove. The guide rail is slidably connected in the guide groove to guide the lifting direction of the inner cylinder relative to the outer cylinder.

[0023] The adjustable double-layer trash can provided by this utility model uses a secondary cycle locking mechanism between the inner and outer rods. When a shorter trash can is needed, the inner cylinder is pressed into the receiving groove of the outer cylinder, and the limiting block is locked into the fixing groove to maintain the pressed state. When a taller trash can is needed, the inner cylinder is pressed again, causing the limiting block to disengage from the fixing groove, and the can rise under the drive of the elastic mechanism and maintain the raised state. This achieves both high and low states, which can adapt to both sitting and standing postures, improving the applicability of the product and ensuring user comfort in various scenarios. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A perspective view of the height-adjustable double-layer trash can provided by this utility model when used as a low trash can;

[0026] Figure 2 The utility model provides a perspective view of the liftable double-layer trash can when used as a tall trash can.

[0027] Figure 3 for Figure 2 The image shows a longitudinal sectional view of a liftable double-layer trash can.

[0028] Figure 4 This is a three-dimensional schematic diagram of the inner and outer rods in their first state.

[0029] Figure 5 This is a three-dimensional schematic diagram of the inner and outer rods in the second state.

[0030] Figure 6 This is a three-dimensional schematic diagram of the inner and outer rods in the third state.

[0031] Figure 7 This is a three-dimensional schematic diagram of the inner and outer rods in the fourth state.

[0032] Figure 8 This is a three-dimensional schematic diagram of the inner and outer rods in the fifth state.

[0033] The diagram is labeled as follows: 100, Liftable double-layer trash can; 10, Outer cylinder; 101, Receiving groove; 11, Guide groove; 20, Inner cylinder; 21, Top cover; 22, Connecting groove; 23, Rotating hole; 24, Guide rail; 30, Outer rod; 301, Lifting groove; 31, Upper sealing ring; 40, Inner rod; 41, Lower sealing wall; 42, Screw; 43, Nut; 50, Elastic mechanism; 60, Limiting block; 61, Upper top corner; 62, Lower top corner; 63, Upper inclined edge; 64, Lower inclined edge; 65, Third top corner; 70, Fixing block; 71, Guide inclined edge; 72, Limiting edge; 701, Fixing groove; 80, Pointed tooth; 81, Fixing edge. Detailed Implementation

[0034] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described in this specification are merely for explaining the present utility model and are not intended to limit the present utility model.

[0035] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0036] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0037] In an embodiment of this utility model, a height-adjustable double-layer trash can 100 is provided for collecting and accommodating trash disposed of by users, facilitating the convenient disposal of collected trash. It is typically used with trash bags. This trash can has both high and low height settings to meet different user needs.

[0038] like Figures 1-8 As shown, the liftable double-layer trash can 100 includes: an outer cylinder 10, an inner cylinder 20, an outer rod 30, an inner rod 40, an elastic mechanism 50, and multiple limit blocks 60.

[0039] The outer cylinder 10 can be cylindrical, cuboid, or similar in shape, and is placed on the ground to support the inner cylinder 20. The outer cylinder 10 has a receiving groove 101, the shape of which is usually adapted to the shape of the outer cylinder 10. In the illustration, the outer cylinder 10 is cuboid. Furthermore, to facilitate the description of the relative positions of the components, the directional terms "top," "top side," "upper side," "above," "bottom," "bottom side," "lower side," and "below" used herein are based on the normal placement and use of the outer cylinder 10, in which case the opening of the receiving groove 101 faces upwards.

[0040] The inner cylinder 20 is shaped to match the outer cylinder 10 and can be lifted and lowered within the receiving groove 101. The inner cylinder 20 is mainly used to hold garbage bags, and a top cover 21 is provided on the top through a fastening or pop-out mechanism to close the top of the inner cylinder 20.

[0041] The outer rod 30 is mounted on the outer cylinder 10 and is typically attached to the inner wall of the receiving groove 101. The outer rod 30 is vertically positioned and has a cylindrical lifting groove 301 coaxially arranged inside. In this embodiment, the top side of the inner wall of the lifting groove 301 is provided with a plurality of fixing blocks 70 and a plurality of sharp teeth 80 evenly distributed circumferentially at vertical intervals. That is, the plurality of fixing blocks 70 form one circle, and the plurality of sharp teeth 80 form another circle, with these two circles spaced vertically apart. It should be noted that the "sharp teeth 80" described in this utility model are presented as triangular teeth in the illustration, but the pointed cone portion being arc-shaped or directly truncated does not affect the realization of the function. Therefore, this collection of approximate shapes is within the scope of the concept of "sharp teeth 80".

[0042] Specifically, each fixing block 70 includes a guide edge 71 and a limiting edge 72. Both the guide edge 71 and the limiting edge 72 are elongated strips attached to the inner wall of the receiving groove 101, with their ends connected. This allows the bottom side of the guide edge 71 and the limiting edge 72 to together form a downward-facing, cone-shaped fixing groove 701. Furthermore, the limiting edge 72 is axially positioned along the lifting groove 301, i.e., vertically. The bottom end of the limiting edge 72 and the bottom end of the guide edge 71 are located on the same cross-section of the lifting groove 301.

[0043] The inner wall of the lifting groove 301 is provided with a fixed edge 81 along the circumference, and multiple sharp teeth 80 are evenly distributed on the fixed edge 81. Adjacent sharp teeth 80 can be arranged side by side or spaced apart to form a trumpet-shaped groove. In this embodiment, half of the sharp teeth 80 are located below the fixed groove 701 (that is, the vertical projection of the fixing block 70 relative to the fixed edge 81 completely covers the corresponding sharp tooth 80), and the other half of the sharp teeth 80 are located below the gap between two adjacent fixing blocks 70. In this case, it is permissible for the vertical projection of the fixing block 70 relative to the fixed edge 81 to partially overlap with the two sides of the sharp tooth 80, or it can be completely non-overlapping.

[0044] In an embodiment of this utility model, the inner rod 40 is rotatably mounted on the inner cylinder 20, and one end extends into the lifting groove 301, thereby allowing it to extend and retract relative to the outer rod 30.

[0045] Specifically, a lower sealing wall 41 is vertically provided at one end of the inner rod 40 that extends into the lifting groove 301. The lower sealing wall 41 is disc-shaped, and its periphery abuts against the inner wall of the lifting groove 301. The inner wall of the lifting groove 301 is also provided with an upper sealing ring 31 located below the pointed tooth 80. The upper sealing ring 31 can be reused with the fixed edge 81, that is, the fixed edge 81 can also be used as the upper sealing ring 31. Part of the outer surface of the inner rod 40 abuts against the inner wall of the upper sealing ring 31. Therefore, there are at least two contact positions between the inner rod 40 and the outer rod 30, thereby improving the stability of the inner rod 40 when rotating or moving up and down. The outer diameter of the lower sealing wall 41 is larger than the inner diameter of the upper sealing ring 31, thereby preventing the inner rod 40 from detaching from the lifting groove 301, and thus limiting the complete detachment of the inner cylinder 20 from the outer cylinder 10.

[0046] Furthermore, a connecting groove 22 is provided on the side of the inner cylinder 20 away from the outer cylinder 10. The opening of the connecting groove 22 can be sealed with a decorative cover. A rotating hole 23 with a diameter smaller than the cross-sectional diameter of the inner rod 40 is provided at the bottom of the connecting groove 22, so that the inner rod 40 cannot extend upward through the rotating hole 23. A screw 42 is coaxially provided at the end of the inner rod 40 away from the outer cylinder 10, and the outer diameter of the screw 42 is smaller than the inner diameter of the rotating hole 23. One end of the screw 42 passes through the rotating hole 23 and is screwed with a nut 43, the outer diameter of the nut 43 being larger than the inner diameter of the rotating hole 23. The bottom side of the nut 43 touches the bottom of the connecting groove 22, rather than being locked to the bottom of the connecting groove 22, which can prevent the inner rod 40 from falling downward, ultimately preventing the inner rod 40 from rising or falling relative to the inner cylinder 20, and allowing the screw 42 to rotate along its own central axis within the rotating hole 23, that is, without restricting the horizontal rotational freedom of the inner rod 40.

[0047] The elastic mechanism 50 is disposed within the lifting groove 301 and abuts against the bottom of the inner rod 40 to drive the inner rod 40 to rise. That is, the elastic mechanism 50 always has elastic potential energy that forces the inner rod 40 to rise.

[0048] In the first implementation, the elastic mechanism 50 is an air chamber formed by sealing the portion of the lifting groove 301 away from the inner cylinder 20 through the lower sealing wall 41. The air chamber is pre-filled with compressed air, thus possessing outward pushing potential energy when compressed. To ensure the air chamber's seal, a first sealing ring (not shown) is fitted around the periphery of the lower sealing wall 41. The first sealing ring is press-fitted between the lower sealing wall 41 and the inner wall of the lifting groove 301, and has almost no impact on the movement of the lower sealing wall 41 as it rises and falls with the inner rod 40. Similarly, a second sealing ring (not shown) is nested within the inner wall of the upper sealing ring 31 to enhance the airtightness of the air chamber.

[0049] In the second implementation, the elastic mechanism 50 is a compression spring located between the bottom of the lifting groove 301 and the lower sealing wall 41. The compression spring is compressed, thereby possessing elastic potential energy to push the inner rod 40 upward.

[0050] In an embodiment of this utility model, multiple limiting blocks 60 are evenly distributed circumferentially on the top side of the inner rod 40, and are arranged in a one-to-one correspondence with the fixing blocks 70. Each limiting block 60 includes an upper top corner 61, a lower top corner 62, and an upper inclined edge 63 and a lower inclined edge 64. The upper top corner 61 and the lower top corner 62 are both cone-shaped or conical.

[0051] Specifically, each limiting block 60 also includes a third apex portion 65. The third apex portion 65, the upper apex portion 61, and the lower apex portion 62 together form a triangle attached to the surface of the inner rod 40 (and therefore will bend accordingly with the surface of the inner rod 40). The upper inclined edge 63 is located between the upper apex portion 61 and the third apex portion 65, and the lower inclined edge 64 is located between the lower apex portion 62 and the third apex portion 65, and the lengths of the upper inclined edge 63 and the lower inclined edge 64 are the same, that is, in the axial direction of the inner rod 40, the third apex portion 65 is located in the middle between the upper apex portion 61 and the lower apex portion 62. Furthermore, the upper apex portion 61 and the lower apex portion 62 are spaced vertically along the axial direction of the inner rod 40.

[0052] The principle of this invention is as follows:

[0053] (1) Combination Figure 4 As shown, when the inner cylinder 20 is pressed, the inner rod 40 drives the limiting block 60 to move downward. After the lower top corner 62 touches the guide slope 71, it first descends along the top side of the guide slope 71. Since the guide slope 71 is inclined downward along the inner wall of the lifting groove 301, during this process, it will drive the inner rod 40 to rotate in the positive direction and downward.

[0054] (2) Combination Figure 5As shown, after the lower corner 62 disengages from the guide slope 71, the inner rod 40 continues vertically downward until the lower slope 64 touches the sharp tooth 80 located between the two fixed blocks 70; then the lower slope 64 abuts against the sharp tooth 80 and descends. Since the lower slope 64 is tilted in the opposite direction to the guide slope 71 (for example: the guide slope 71 is tilted in the lower left direction, and the lower slope 64 is tilted in the lower right direction), during this process, the inner rod 40 will be driven to rotate in the opposite direction until the lower corner 62 descends to the bottom.

[0055] (3) Combination Figure 6 As shown, when the inner rod 40 cannot move downwards, the pressure on the inner cylinder 20 is released. After the pressure on the inner rod 40 is released, the elastic mechanism 50 will drive the inner rod 40 to rise until the upper corner 61 or the upper inclined edge 63 abuts against the bottom side of the guide inclined edge 71. During this process, due to the inclined setting of the guide inclined edge 71, the inner rod 40 will continue to rotate in the opposite direction and rise until the upper corner 61 is stuck in the fixing groove 701. At this time, the limiting block 60 is stuck in the fixing groove 701 and can neither rise nor rotate left or right. Combined with the continuous upward driving action of the elastic mechanism 50, the inner cylinder 20 is finally located inside the outer cylinder 10, forming a short trash can.

[0056] (4) Combination Figure 7 As shown, when a tall trash can is needed, press the inner cylinder 20 again. The inner rod 40 moves down a short distance until the lower inclined edge 64 abuts against the top of the sharp tooth 80 located below the fixing groove 701. The lower inclined edge 64 continues to abut against the sharp tooth 80 and descends. As the lower inclined edge 64 tilts downward, it will drive the inner rod 40 to rotate in the opposite direction and continue to descend until the lower top corner 62 descends to the bottom. During this process, the limiting block 60 rotates in the opposite direction while descending, and will disengage from the fixing groove 701 and be located below the limiting edge 72.

[0057] (5) Combination Figure 8 As shown, when the inner rod 40 cannot move downwards, the pressure on the inner cylinder 20 is released. After the pressure on the inner rod 40 is released, the elastic mechanism 50 drives the inner rod 40 to rise vertically until the upper inclined edge 63 abuts against the bottom of the limiting edge 72. Since the upper inclined edge 63 is inclined, the upper inclined edge 63 abutting against the bottom side of the limiting edge 72 will cause the inner rod 40 to continue to rotate in the opposite direction and rise until the limiting block 60 passes through the gap between the two fixed blocks 70 and rises. After the inner rod 40 rises to the highest point, it maintains this state under the combined action of the elastic mechanism 50 and the lower sealing wall 41, thus forming a high trash can. To switch back to a low trash can, repeat step (1).

[0058] Furthermore, in some embodiments, the inner wall of the receiving groove 101 is provided with at least one guide groove 11 along the lifting direction of the inner cylinder 20, and the outer wall of the inner cylinder 20 is provided with a guide rail 24 corresponding to the guide groove 11. The guide rail 24 is slidably connected in the corresponding guide groove 11 to guide the lifting direction of the inner cylinder 20 relative to the outer cylinder 10.

[0059] In summary, the adjustable double-layer trash can 100 provided by this utility model utilizes a secondary cycle locking mechanism between the inner rod 40 and the outer rod 30. When a shorter trash can is needed, the inner cylinder 20 is pressed into the receiving groove 101 of the outer cylinder 10, and the limiting block 60 is locked into the fixing groove 701 to maintain this pressed state. When a taller trash can is needed, the inner cylinder 20 is pressed again, causing the limiting block 60 to disengage from the fixing groove 701, and the can rise under the drive of the elastic mechanism 50 and maintain this raised state. This achieves both high and low states, adapting to both sitting and standing postures, thus improving the product's applicability and ensuring user comfort in various scenarios.

[0060] This invention is not limited to the description in the specification and embodiments. Therefore, other advantages and modifications can be readily realized by those skilled in the art. Thus, without departing from the spirit and scope of the general concept as defined by the claims and their equivalents, this invention is not limited to the specific details, representative devices and illustrated examples shown and described herein.

Claims

1. A height-adjustable double-layer trash can, characterized in that, include: The outer cylinder is provided with a receiving groove; Inner cylinder, which can be lifted and lowered within the receiving groove; An outer rod is provided on the outer cylinder and has a lifting groove. The top side of the inner wall of the lifting groove is provided with a plurality of fixing blocks and a plurality of sharp teeth that are evenly distributed circumferentially at intervals. Each fixing block includes a guide edge and a limiting edge, and the bottom side of the guide edge and the limiting edge together form a fixing groove. An inner rod is rotatably mounted on the inner cylinder, with one end extending into the lifting groove; An elastic mechanism is provided in the lifting groove and abuts against the bottom of the inner rod to drive the inner rod to rise; Multiple limiting blocks are evenly distributed circumferentially on the top side of the inner rod and are corresponding one-to-one with the fixing blocks; each limiting block includes an upper top corner, a lower top corner, an upper inclined edge, and a lower inclined edge; When the inner cylinder is pressed, the lower top corner first descends along the top side of the guide slope to drive the inner rod to rotate in the forward direction. Then, the lower slope abuts against the pointed tooth and descends to drive the inner rod to rotate in the reverse direction. After the pressure on the inner rod is released, the elastic mechanism drives the inner rod to rise, and the upper top corner or the upper slope abuts against the bottom side of the guide slope to make the inner rod continue to rotate in the reverse direction until the upper top corner is engaged in the fixing groove. When the inner cylinder is pressed again, the lower inclined edge abuts against the adjacent pointed teeth and descends to drive the inner rod to rotate in the opposite direction; after the pressure on the inner rod is released, the elastic mechanism drives the inner rod to rise, and the upper inclined edge abuts against the bottom side of the limiting edge to make the inner rod continue to rotate in the opposite direction until the limiting block passes through the gap between the two fixed blocks and rises.

2. The liftable double-layer trash can as described in claim 1, characterized in that, Each of the limiting blocks further includes a third apex; the third apex, the upper apex, and the lower apex together form a triangle; the upper oblique edge is located between the upper apex and the third apex, the lower oblique edge is located between the lower apex and the third apex, and the lengths of the upper oblique edge and the lower oblique edge are the same.

3. The adjustable double-layer trash can as described in claim 2, characterized in that, The upper and lower corner portions are spaced vertically along the axial direction of the inner rod.

4. The liftable double-layer trash can as described in claim 1, characterized in that, The inner wall of the lifting groove is provided with a fixed edge along the circumference, and the plurality of sharp teeth are evenly distributed on the fixed edge; wherein, half of the sharp teeth are located below the fixed groove, and the other half of the sharp teeth are located below the gap between two adjacent fixed blocks.

5. The liftable double-layer trash can as described in claim 1, characterized in that, The limiting edge is arranged along the axial direction of the lifting groove, and its bottom end and the bottom end of the guide edge are located on the same cross section of the lifting groove.

6. The liftable double-layer trash can as described in claim 1, characterized in that, The inner rod extends into the lifting groove and is vertically provided with a lower sealing wall. The periphery of the lower sealing wall abuts against the inner wall of the lifting groove. The inner wall of the lifting groove is also provided with an upper sealing ring located below the sharp tooth. A portion of the outer surface of the inner rod abuts against the inner wall of the upper sealing ring. The outer diameter of the lower sealing wall is larger than the inner diameter of the upper sealing ring.

7. The liftable double-layer trash can as described in claim 6, characterized in that, The elastic mechanism is an air chamber formed by sealing the portion of the lifting groove away from the inner cylinder through the lower sealing wall; a first sealing ring is sleeved on the periphery of the lower sealing wall, and a second sealing ring is nested in the inner wall of the upper sealing ring.

8. The liftable double-layer trash can as described in claim 6, characterized in that, The elastic mechanism is a compression spring located between the bottom of the lifting groove and the lower sealing wall.

9. The liftable double-layer trash can as described in claim 1, characterized in that, The inner cylinder has a connecting groove on the side away from the outer cylinder; the bottom of the connecting groove has a rotating hole with a diameter smaller than the cross-sectional diameter of the inner rod; the end of the inner rod away from the outer cylinder is coaxially provided with a screw rod, one end of the screw rod passes through the rotating hole and is screwed with a nut, the bottom side of the nut touches the bottom of the connecting groove so that the screw rod can rotate along its own central axis in the rotating hole.

10. The liftable double-layer trash can as described in claim 1, characterized in that, The inner wall of the receiving groove is provided with at least one guide groove along the lifting direction of the inner cylinder, and the outer wall of the inner cylinder is provided with a guide rail corresponding to the guide groove. The guide rail is slidably connected in the guide groove to guide the lifting direction of the inner cylinder relative to the outer cylinder.

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