Barrel cover preassembling structure facilitating stacking of garbage cans

Abstract

The utility model discloses a can cover preassembling structure convenient for garbage can stacking, which is suitable for a garbage can with a can body provided with a moving piece for guiding, driving or limiting the movement of a can cover, and comprises a top cover and a moving piece pre-connecting piece which are coaxially and rotatably connected with the can body of the garbage can, the top cover can be overturned and hung on the outer side of the can body of the garbage can, and the moving piece pre-connecting piece is connected with the moving piece of the garbage can. An elastic clamping structure is arranged between the top cover and the movable piece pre-connecting piece and comprises a clamping insertion piece, an elastic piece and a clamping groove; the movable piece pre-connecting piece is movably provided with the clamping and inserting piece, the first end of the elastic piece is connected to the clamping and inserting piece, and the second end abuts against the movable piece pre-connecting piece; the top cover is provided with a clamping groove, and the extending elastic piece abuts against the card insertion piece to be located on the rotating track of the clamping groove. During assembly, the top cover rotates to approach the position of the moving piece pre-connecting piece, external force compresses the elastic piece to enable the card inserting piece to cross over or pass through the outer wall of the card groove to be aligned with the notch, after the external force is removed, the elastic piece stretches, the card inserting piece is inserted into the card groove, and the combined locking action is executed by the elastic piece driving the card inserting piece without manual locking of a user.

Description

Technical Field

[0001] This utility model belongs to the field of trash can technology, specifically relating to a pre-installed lid structure for facilitating the stacking of trash cans. Background Technology

[0002] When transporting trash cans with lids in bulk, transporting them as fully assembled finished products would result in excessively large transport volume and high transportation costs. Currently, most trash cans are transported by stacking several can bodies inside each other and placing several lids inside the top can body. The separate can bodies and lids are transported to the destination as semi-finished products and then reassembled. Due to the need for reassembly, the ease and intuitiveness of assembling the lids and can bodies are particularly important for the design of this type of trash can.

[0003] On the other hand, the applicant's products are exported overseas. Through research and feedback from downstream distributors, it was found that due to high labor costs, large overseas stores (such as Walmart and Costco) do not assemble the semi-finished components that are transported in bulk. Instead, they are directly stacked and sold. Since multiple lids are placed in the topmost bucket, it is easy for store staff to miss or take all the lids when packing for customers or when customers take them themselves, resulting in losses for the store or requiring additional after-sales operations for users.

[0004] In summary, it is particularly necessary to design a trash can head that can be sold in a "one can, one lid" set and does not hinder the stacking of multiple cans, and is easy to assemble. To achieve the above requirements, the applicant designed a fixing structure for detachable lids, as described in the utility model patent application number 2022234846672, applicable to trash cans. This structure includes a decorative ring and a lid that are separate from the can body. The can body opening is pre-installed with the decorative ring and at least one rotatable connector. The placement of the decorative ring and lid connector does not hinder the stacking of multiple cans, minimizing transport volume and helping to control transportation costs. One connector serves as the lid connector, with a matching engaging structure between the lid connector and the lid. A matching hanging structure is provided between one side of the can body and the lid. Before installation, the lid hangs on one side of the can body without hindering the stacking of multiple cans, allowing for sale in a "one can, one lid" set.

[0005] However, during product iteration, the inventors discovered that the product still had room for improvement:

[0006] First, the bucket lid of the above-mentioned patent requires the manufacturer to design additional and unconventional assembly steps during assembly, that is, to deliberately hang the bucket lid on one side of the bucket body by manual or mechanical means. Therefore, the inventor believes that there is still room for improvement in the assembly of the product. At the same time, the bucket lid of the product can be completely separated from the bucket body, but there is still a risk of loss.

[0007] Second, the bucket lid of the above-mentioned patent is a completely independent part. After receiving it, the user needs to insert the bucket lid and the connector. Although a relatively simple and intuitive structural design has been achieved, some users still forcefully insert the lid without aligning it properly, resulting in deformation or breakage of the parts. Home product design is a process of continuously making more detailed and humanized designs for users. Therefore, the inventor believes that there is room for improvement in the installation structure and installation method that serves users. Summary of the Invention

[0008] In view of the problems in the related technologies, this utility model proposes a pre-installed lid structure for convenient stacking of trash cans, so as to overcome the above-mentioned technical problems existing in the existing related technologies.

[0009] The technical solution of this utility model is implemented as follows:

[0010] A pre-installed lid structure for convenient stacking of trash cans is provided. It is suitable for trash cans with moving parts that guide, drive, or restrict the movement of the lid. The moving parts can be damping rods that slow down the opening and closing speed of the lid, foot pedals and foot pedals of the trash can, motor transmission rods that drive the lid to open or close, etc.

[0011] The pre-assembled lid structure includes a top cover pre-installed on the body of the trash can and a moving pre-connector. The top cover and the moving pre-connector are coaxially rotatably connected to one side of the trash can body. The top cover and the moving pre-connector can be pre-assembled on the body of the trash can during the hinge process of production assembly. Manufacturers do not need to design additional, unconventional assembly steps (i.e., hanging the separate lid parts against the body of the trash can), which effectively reduces assembly costs. At the same time, this utility model can be sold in a "one lid per trash can" matching format, avoiding problems caused by multiple separate lid designs such as wrong parts, missing parts, and wrong takeout.

[0012] Meanwhile, before the top cover is combined with the moving pre-connector, the top cover can be flipped up and hangs on the outside of the trash can body, which does not hinder the stacking of the can bodies, which is conducive to controlling the transportation volume and saving transportation costs.

[0013] The pre-connector for moving parts directly connects to or drives the moving parts of the trash can. By designing a smaller pre-connector for moving parts, the top cover can be pre-installed with the moving parts, allowing the moving parts that are related to the movement of the lid and are difficult to install to be pre-installed on the body of the trash can by the manufacturer.

[0014] At least one set of matching elastic engagement structures is provided between the top cover and the moving pre-connector of the split parts, and one set of elastic engagement structures includes a card insert, an elastic element and a card slot;

[0015] At least one of the card plugs is movably mounted on the moving pre-connector; the elastic member is arranged along the moving direction of the card plug and its first end is connected to the card plug; the second end of the elastic member abuts against the moving pre-connector.

[0016] The top cover has a slot that opens to one side. The direction in which the elastic member extends and supports the card insert is opposite to the opening direction of the slot. When the elastic member extends and supports the card insert, it is located on the rotation trajectory of the slot. When the elastic member is compressed, the card insert is no longer on the rotation trajectory of the slot.

[0017] When the top cover is assembled with the moving part pre-connector, the top cover rotates closer to the position of the moving part pre-connector, the insert contacts the slot, and the external force compresses the elastic element, causing the insert to temporarily leave the rotation trajectory of the slot, and then pass over or through the outer wall of the slot to align with the slot opening. After the external force is removed, the elastic element extends, and the insert is inserted into the slot under the drive of the elastic element and remains in the inserted state. The top cover is assembled and fixed to the moving part pre-connector and is relatively stationary.

[0018] The coaxial design of this invention ensures that both the top cover and the moving pre-connector have only one movement trajectory, namely, rotation. Combined with the elastic locking structure, during installation, the user only needs to flip the top cover, which is already hinged to the barrel body, into contact with the moving pre-connector, and then apply a little force to make the two fit together. The locking action is performed by the elastic element driving the locking plug, eliminating the need for manual locking by the user. The assembly method of this invention is intuitive and easy to learn, improving the user experience. The extremely convenient installation also reduces the chance of the user damaging the parts during the installation process.

[0019] In actual production, the card insert and the moving part pre-connector can be installed in various ways, such as rotational connection design and sliding connection design. Essentially, as long as the installation between the card insert and the moving part pre-connector does not prevent the card insert from being inserted into the card slot using the elasticity of the elastic element, it is acceptable.

[0020] The locking design of this utility model can be achieved by a set of elastic interlocking structures. It is preferred to design them to be evenly distributed and symmetrically distributed, so that the force is uniform and the service life of the structure is extended.

[0021] The elastic element can be a spring sheet, torsion spring, coil spring, snap ring, high-elasticity rubber block, etc., and its specific movement trajectory is designed to match the insertion of the card insert into the card slot.

[0022] Preferably, when the top cover is assembled with the moving part pre-connector, a guide slope is provided at the position where the card plug contacts the card slot. The guide slope is formed by extending outward from the end of the card plug that connects to the elastic element and away from the elastic element and the card slot, and is set as the insertion end of the card plug.

[0023] When the external force drives the top cover and the moving pre-connector to fit together for assembly, the guide slope contacts the edge of the slot. The non-deformable edge of the slot moves along the guide slope, thereby squeezing the insert to move in the direction of compressing the elastic element until the entire insertion end slides past the edge of the slot. The edge of the slot no longer squeezes the insert, and the elastic element "suddenly" extends to drive the insertion end to insert into the slot and remain in the inserted state.

[0024] The design of the aforementioned guide slope makes the installation of this utility model smoother. At the same time, since the clips and elastic components of this utility model are obviously small parts, the design of the guide slope can apply force to them more gently and smoothly, making the movement of the parts stable and reducing the probability of damage to the parts.

[0025] Preferably, the moving part pre-connector has a cavity open toward the top cover, and a sliding groove is provided in the cavity. The card insert is slidably installed in the sliding groove, so that the card insert is movably installed in the moving part pre-connector. The sliding groove design assists the elastic element to limit the sliding direction and trajectory of the card insert, so as to accurately insert it into the card slot.

[0026] The first end of the slide is an open structure, and the insertion end of the card is exposed outside the first end of the slide. The insertion end is suspended relative to the bottom of the cavity. An abutment is provided in the slide near the second end for the second end of the elastic member to abut.

[0027] The top cover rotatably fits the pre-connected component of the moving part, and the cover surface protrudes outward to form the slot.

[0028] After the external force drives the top cover and the moving pre-connector to fit together to complete the assembly, the slot is wrapped inside the cavity, and the cavity opening is covered by the top cover, making the assembled utility model more concise in appearance and reducing exposed gaps or angled structures to avoid dirt accumulation.

[0029] Preferably, the card insert is hollow inside and forms an upward-opening mounting cavity, and the mounting cavity has a protruding shaft block on the cavity sidewall near the insertion end;

[0030] The elastic element is a helical spring, which is sleeved on the shaft block. The inner width of the mounting cavity is adapted to the outer diameter of the helical spring, specifically, the inner width of the cavity is slightly greater than or equal to the outer diameter of the helical spring, thereby limiting the tendency of the helical spring to bend towards the side wall of the mounting cavity when compressed.

[0031] Furthermore, both the slide and the mounting cavity are open at the top, and the moving part pre-connector is fixedly equipped with a baffle plate. The baffle plate covers part or all of the open top of the slide, thereby limiting the tendency of the helical spring to bend towards the open top of the mounting cavity when compressed. The baffle plate does not obstruct the insertion end, and the baffle plate is flush with the top edge of the moving part pre-connector.

[0032] Through the design of the cavity width and the baffle design described above, the helical spring can only move in the elastic direction, ensuring that the force exerted by the helical spring on the clip is accurately directed in the target direction.

[0033] Preferably, at least one turning opening is formed at the turning point of the side wall and bottom of the moving part pre-connector, the turning opening is connected to the second end of the slide groove, and the abutting part is formed by extending from the side wall of the moving part pre-connector above the turning opening into the slide groove near the second end. The abutting part is suspended, and after the snap-fit ​​is assembled into the moving part pre-connector, the abutting part is located inside the mounting cavity and cooperates with the shaft block to install the helical spring.

[0034] The other end of the card insert opposite its own insertion end is designated as a manual end, which is exposed to the outside of the moving part pre-connector through the turning port. Grabbing the manual end and moving it away from the moving part pre-connector can be used to prevent the insertion end from colliding with the card slot during the assembly of the top cover and the moving part pre-connector (an unnecessary action), or it can be used to disassemble the top cover and the moving part pre-connector, allowing the insertion end to disengage from the card slot.

[0035] Preferably, the bottom of the cavity protrudes towards the top of the open cavity to form two parallel cavity walls, and the edges of the two cavity walls away from the bottom of the cavity protrude towards each other to form at least two opposing clamping hooks, which clamp the two sides of the card insert but do not obstruct the sliding of the card insert.

[0036] The cavity bottom between the two vertical walls and the two vertical walls together form a top-open groove, which has a simplified structure and facilitates the integral molding production of the groove and the moving part pre-connected part.

[0037] Preferably, the mounting cavity is provided with a clearance opening that completely penetrates the bottom of the card insert at the cavity bottom position corresponding to the shaft block. The card insert is a small part, and the "mounting cavity" as a structural design on the card insert is even smaller. If there are cavity walls that are too close to the shaft block, it will be difficult for the slurry to fill the position during injection molding, resulting in a high defect rate. This utility model avoids this problem by designing the clearance opening.

[0038] Preferably, the bottom surface of the card insert protrudes downward to form at least two sliding protrusions. The sliding protrusions are arranged along the sliding direction of the card insert and distributed on both sides of the bottom surface of the card insert. The sliding protrusions contact the sliding groove to support smooth sliding and reduce surface contact between the card insert and the sliding groove that is not conducive to sliding.

[0039] Preferably, the bottom of the card insert has an inverted stepped structure with at least two steps, namely a high step and a low step. The low step is located in the slide groove, and the high step is exposed as the hand-operated end through the turning opening. The edge of the turning opening has a notch corresponding to the side wall where the high step and the low step are connected, allowing fingers to insert and grab. Attached Figure Description

[0040] Figure 1 This is one of the structural schematic diagrams of this utility model (unassembled state);

[0041] Figure 2 This is the second structural schematic diagram of the present invention (in assembled state).

[0042] Figure 3 This is a schematic diagram of the combined structure of the moving pre-connector and the elastic locking structure of this utility model;

[0043] Figure 4 for Figure 3 Enlarged view of point A;

[0044] Figure 5 This is a structural schematic diagram of the moving pre-connector of this utility model;

[0045] Figure 6 This is one of the schematic diagrams of the combined structure of the card insert and the elastic element of this utility model;

[0046] Figure 7 This is the second schematic diagram of the combined structure of the card insert and the elastic element of this utility model;

[0047] Figure 8 This is one of the schematic diagrams of the combined action of this utility model (before combination);

[0048] Figure 9 This is the second schematic diagram of the combined action of this utility model (in the process of assembly);

[0049] Figure 10 This is the third schematic diagram of the combined action of this utility model (after assembly);

[0050] Figure 11 A foot-operated trash can (the body of the trash can is omitted) equipped with this utility model.

[0051] Marker explanation:

[0052] 1. Top cover; 101. Card slot;

[0053] 2. Baffle plate; 201. Insert shaft;

[0054] 3. Moving part pre-connector; 301. Contact part; 302. Shaft hole; 303. Turning opening; 303a. Notch; 304. Slide groove; 305. Clamping hook;

[0055] 4. Socket; 401. Mounting cavity; 402. Shaft block; 403. Insertion end; 403a. Guide slope; 404. Manual end; 405. Clearance opening; 406. Sliding convex strip;

[0056] 5. Transmission support rod;

[0057] 6. Elastic element (coil spring). Detailed Implementation

[0058] 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 a part of the embodiments of the present utility model, and not all of them. 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.

[0059] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0060] like Figures 1 to 11 As shown, a pre-installed lid structure for convenient stacking of trash cans is applicable to trash cans with moving parts on the body that guide, drive, or restrict the movement of the lid. This embodiment uses a foot-operated trash can as an example. The moving parts are the foot pedal and transmission support rod 5 pre-installed on the body of the trash can (e.g., ...). Figure 11 (As shown, the barrel body has been omitted).

[0061] This embodiment includes a top cover 1 and a moving part pre-connector 3 pre-installed on the body of the trash can. The top cover 1 is a large flat plate that completely covers the opening of the trash can, and the moving part pre-connector 3 is a small, thin box that does not significantly affect the stacking of the trash cans. The top cover 1 and the moving part pre-connector 3 are coaxially rotatably connected to one side of the trash can body, and the moving part pre-connector 3 is directly connected to or has a transmission connection to the moving parts of the trash can.

[0062] The top cover 1 and the moving pre-connector 3 of the split are provided with two sets of matching elastic engagement structures and are symmetrically distributed. One set of elastic engagement structures includes a slot 101, a plug 4 and an elastic element 6.

[0063] Two locking plugs 4 are movably installed on opposite sides of the moving pre-connector 3. The elastic member 6 is arranged along the moving direction of the locking plug 4 and its first end is connected to the locking plug 4. The second end of the elastic member 6 abuts against the moving pre-connector 3.

[0064] The top cover 1 is provided with a slot 101 that opens to one side. In this embodiment, the two slots 101 are designed to face away from each other and open to the left and right sides respectively. The direction of the extension of the elastic member 6 supporting the card insert 4 is opposite to the opening direction of the slot 101. When the extension of the elastic member 6 supports the card insert 4, it is located on the rotation trajectory of the slot 101. When the elastic member 6 is compressed, the card insert 4 is no longer on the rotation trajectory of the slot 101.

[0065] Before the top cover 1 is combined with the moving pre-connector 3, the top cover 1 can be flipped up and hangs on the outside of the trash can body.

[0066] When the top cover 1 is assembled with the moving part pre-connector 3, the top cover 1 rotates closer to the position of the moving part pre-connector 3, the insert 4 contacts the slot 101, and the external force compresses the elastic member 6 to make the insert 4 leave the rotation trajectory of the slot 101, and then pass over or through the outer wall of the slot 101 to align with the slot. After the external force is removed, the elastic member 6 extends, and the insert 4 is inserted into the slot 101 under the drive of the elastic member 6 and remains in the inserted state. The top cover 1 is assembled and fixed to the moving part pre-connector 3 and is relatively stationary.

[0067] In this embodiment, when the top cover 1 is assembled with the moving pre-connector 3, a guide slope 403a is provided at the position where the card insert 4 contacts the card slot 101. The guide slope 403a is formed by extending outward from the end of the card insert 4 that connects to the elastic member 6 and away from the elastic member 6 and the card slot 101, and is set as the insertion end 403 of the card insert 4. In this embodiment, the top surface of the insertion end 403 is the guide slope 403a, and the bottom surface is a plane.

[0068] When an external force drives the top cover 1 and the moving pre-connector 3 to fit together for assembly, the guide slope 403a contacts the edge of the slot 101 (e.g., Figure 8 As shown), the non-deformable groove edge moves along the guide slope 403a, thereby squeezing the card insert 4 in the direction of compressing the elastic member 6 (as shown). Figure 9 As shown), until the entire insertion end 403 slides past the edge of the slot, and the edge of the slot no longer presses against the card insert 4, the elastic element 6 "suddenly" extends, driving the insertion end 403 to insert into the card slot 101 and maintain the inserted state (as shown). Figure 10 (As shown).

[0069] In this embodiment, the moving part pre-connector 3 has a cavity that opens toward the top cover 1. A groove 304 is provided in the cavity, and the card insert 4 is slidably installed in the groove 304, so that the card insert 4 is movably installed in the moving part pre-connector 3.

[0070] The first end of the slide groove 304 is an open structure, and the insertion end 403 of the card plug 4 is exposed outside the first end of the slide groove 304. The insertion end 403 is suspended relative to the bottom of the cavity. The slide groove 304 is provided with an abutment part 301 near the second end for the second end of the elastic member 6 to abut.

[0071] The top cover 1 rotates and fits the pre-connecting component 3, and the cover surface protrudes outward to form the slot 101. The slot 101 is integrally formed with the top cover 1.

[0072] After the external force drives the top cover 1 and the moving pre-connector 3 to fit together and complete the assembly, the slot 101 is wrapped inside the cavity, and the cavity opening is covered by the top cover 1.

[0073] In this embodiment, the card insert 4 is hollow inside and forms an upwardly open mounting cavity 401. The mounting cavity 401 has a protruding shaft block 402 on the cavity sidewall near the insertion end 403.

[0074] The elastic element 6 is a helical spring. The first end of the helical spring is fixed to the shaft block 402. The inner width of the mounting cavity 401 is adapted to the outer diameter of the helical spring, thereby limiting the tendency of the helical spring to bend towards the cavity sidewall of the mounting cavity 401 when compressed.

[0075] Furthermore, both the slide groove 304 and the mounting cavity 401 are open at the top. The moving part pre-connector 3 is fixedly mounted with a baffle 2. The cavity of the moving part pre-connector is provided with a shaft hole 302 near the slide groove 304. The baffle 2 has an insert shaft 201 that fits the shaft hole 302. The baffle 2 is fixed to the moving part pre-connector 3 by inserting the insert shaft 201 into the shaft hole 302. The baffle 2 covers part or all of the open top of the slide groove 304, thereby limiting the tendency of the helical spring to bend towards the open top of the mounting cavity 401 when compressed. The baffle 2 does not obstruct the insertion end 403. The baffle 2 is flush with the top edge of the moving part pre-connector 3. After the moving part pre-connector 3 is assembled with the top cover 1, the baffle 2 is tightly attached to the top cover 1, thereby achieving further fixed installation.

[0076] In this embodiment, at least one turning opening 303 is formed at the turning point of the side wall and bottom of the moving part pre-connector 3. The turning opening 303 is connected to the second end of the slide groove 304. The abutting part 301 is formed by extending from the side wall of the moving part pre-connector 3 above the turning opening 303 into the slide groove 304 near the second end. The abutting part 301 is suspended, and after the locking plug 4 is assembled into the moving part pre-connector 3, the abutting part 301 is located inside the mounting cavity 401.

[0077] The other end of the card insert 4 opposite to its own insertion end 403 is set as a manual end 404. The manual end 404 is exposed to the outside of the moving part pre-connector 3 through the turning port 303. When the manual end 404 is grasped and moved away from the moving part pre-connector 3, the insertion end 403 is disengaged from the card slot 101, and the top cover 1 and the moving part pre-connector 3 can be disassembled and assembled.

[0078] In this embodiment, the bottom of the cavity protrudes towards the top of the cavity to form two parallel cavity walls. The edges of the two cavity walls away from the bottom of the cavity protrude towards each other to form four pairs of opposing clamping hooks 305. The clamping hooks 305 clamp the two sides of the card insert 4 but do not obstruct the sliding of the card insert 4.

[0079] The cavity bottom between the two vertical walls and the two vertical walls together form a top-open groove 304.

[0080] In this embodiment, the mounting cavity 401 is provided with a clearance opening 405 that completely penetrates the bottom of the card insert 4 at the cavity bottom position corresponding to the shaft block 402.

[0081] In this embodiment, the bottom surface of the card insert 4 protrudes downward to form two sliding protrusions 406. The sliding protrusions 406 are arranged along the sliding direction of the card insert 4 and distributed on both sides of the bottom surface of the card insert 4. The sliding protrusions 406 are in contact with the sliding groove 304.

[0082] In this embodiment, the bottom of the card insert 4 is an inverted stepped structure with at least two steps, namely a high step and a low step. The low step is located in the slide groove 304, and the high step is exposed as the hand operation end 404 through the turning opening 303. The edge of the turning opening 303 is provided with a notch 303a on the side wall corresponding to the high step and the low step for fingers to insert and grab.

[0083] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A pre-installed lid structure for convenient stacking of trash cans, suitable for trash cans with moving parts on the body that guide, drive, or restrict the movement of the lid, characterized in that, It includes a top cover and a moving part pre-connector pre-installed on the body of the trash can. The top cover and the moving part pre-connector are coaxially rotatably connected to one side of the trash can body. The moving part pre-connector is directly connected to or drives the moving part of the trash can. At least one set of matching elastic engagement structures is provided between the top cover and the moving pre-connector of the split parts, and one set of elastic engagement structures includes a card insert, an elastic element and a card slot; At least one of the card plugs is movably mounted on the moving pre-connector; the elastic member is arranged along the moving direction of the card plug and its first end is connected to the card plug; the second end of the elastic member abuts against the moving pre-connector. The top cover has a slot that opens to one side. The direction in which the elastic member extends and supports the card insert is opposite to the opening direction of the slot. When the elastic member extends and supports the card insert, it is located on the rotation trajectory of the slot. When the elastic member is compressed, the card insert is no longer on the rotation trajectory of the slot. Before the top cover is combined with the moving pre-connector, the top cover can be flipped up and hangs on the outside of the trash can body; When the top cover is assembled with the moving part pre-connector, the top cover rotates closer to the position of the moving part pre-connector, the insert contacts the slot, and the external force compresses the elastic element, causing the insert to leave the rotation trajectory of the slot and pass over or through the outer wall of the slot to align with the slot opening. After the external force is removed, the elastic element extends, and the insert is inserted into the slot under the drive of the elastic element and remains inserted. The top cover is assembled and fixed to the moving part pre-connector and is relatively stationary.

2. The pre-assembled lid structure for convenient stacking of trash cans according to claim 1, characterized in that, When the top cover is assembled with the moving part pre-connector, a guide slope is provided at the position where the card plug contacts the card slot. The guide slope is formed by extending outward from the end of the card plug that connects to the elastic element and away from the elastic element and the card slot, and is set as the insertion end of the card plug. When the external force drives the top cover and the moving pre-connector to fit together for assembly, the guide slope contacts the edge of the slot. The non-deformable edge of the slot moves along the guide slope, thereby squeezing the insert to move in the direction of compressing the elastic element until the entire insertion end slides past the edge of the slot. The edge of the slot no longer squeezes the insert, and the elastic element extends to drive the insertion end to insert into the slot and maintain the insertion state.

3. The pre-assembled lid structure for convenient stacking of trash cans according to claim 2, characterized in that, The moving part pre-connector have A cavity opening toward the top cover, the cavity having a sliding groove, the card insert being slidably mounted in the sliding groove, thereby enabling the card insert to be movably mounted on the moving pre-connector; The first end of the slide is an open structure, and the insertion end of the card is exposed outside the first end of the slide. The insertion end is suspended relative to the bottom of the cavity. An abutment is provided in the slide near the second end for the second end of the elastic member to abut. The top cover rotatably fits the pre-connected component of the moving part, and the cover surface protrudes outward to form the slot. After the external force drives the top cover and the moving pre-connector to fit together and complete the assembly, the slot is wrapped inside the cavity, and the cavity opening is covered by the top cover.

4. The pre-assembled lid structure for convenient stacking of trash cans according to claim 3, characterized in that, The card insert is hollow inside and forms an upward-opening mounting cavity. The mounting cavity has a protruding shaft block on the cavity sidewall near the insertion end. The elastic element is a helical spring, which is sleeved on the shaft block. The inner width of the mounting cavity is adapted to the outer diameter of the helical spring, thereby limiting the tendency of the helical spring to bend towards the side wall of the mounting cavity when compressed.

5. The pre-assembled lid structure for convenient stacking of trash cans according to claim 4, characterized in that, Both the slide and the mounting cavity are open at the top. The moving part pre-connector is fixedly equipped with a baffle plate. The baffle plate covers part or all of the open top of the slide, thereby limiting the tendency of the helical spring to bend towards the open top of the mounting cavity when compressed. The baffle plate does not obstruct the insertion end, and the baffle plate is flush with the top edge of the moving part pre-connector.

6. The pre-assembled lid structure for convenient stacking of trash cans according to claim 4 or 5, characterized in that, At least one turning opening is formed at the turning point of the side wall and bottom of the moving part pre-connector. The turning opening is connected to the second end of the slide groove. The abutting part is formed by extending from the side wall of the moving part pre-connector above the turning opening into the slide groove near the second end. The abutting part is suspended. After the card is assembled into the moving part pre-connector, the abutting part is located inside the mounting cavity. The other end of the card plug-in opposite to its own insertion end is set as a manual operation end, and the manual operation end is exposed to the outside of the moving part pre-connector through the turning port; The hand-operated end is moved away from the moving part pre-connector, the insertion end disengages from the slot, and the top cover and the moving part pre-connector can be disassembled and reassembled.

7. The pre-assembled lid structure for convenient stacking of trash cans according to any one of claims 3 to 5, characterized in that, The bottom of the cavity protrudes towards the top of the open cavity to form two parallel cavity walls. The edges of the two cavity walls away from the bottom of the cavity protrude towards each other to form at least two opposing clamping hooks. The clamping hooks clamp the two sides of the card insert but do not obstruct the sliding of the card insert. The cavity bottom between the two vertical walls and the two vertical walls together form a groove with an open top.

8. The pre-assembled lid structure for convenient stacking of trash cans according to claim 4 or 5, characterized in that, The mounting cavity is provided with an opening that completely penetrates the bottom of the card insert at the cavity bottom position corresponding to the shaft block.

9. The pre-assembled lid structure for convenient stacking of trash cans according to any one of claims 3 to 5, characterized in that, The bottom surface of the card insert protrudes downward to form at least two sliding protrusions. The sliding protrusions are arranged along the sliding direction of the card insert and distributed on both sides of the bottom surface of the card insert. The sliding protrusions are in contact with the sliding groove.

10. The pre-assembled lid structure for convenient stacking of trash cans according to claim 6, characterized in that, The bottom of the card insert has an inverted stepped structure with at least two steps, namely a high step and a low step. The low step is located in the slide groove, and the high step is exposed as the hand-operated end through the turning opening. The edge of the turning opening has a notch corresponding to the side wall where the high step and the low step are connected, allowing fingers to be inserted and gripped.

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