A sand adding mechanism matched with a drum type cat litter box and the drum type cat litter box

Abstract

The application discloses a sand adding mechanism matched with a drum type cat litter basin and belongs to the technical field of intelligent pet cat toilets. The sand adding mechanism is characterized in that a sand storage space is arranged in a round cover shell body, and a sand holding channel is utilized to rotate and hold clean cat litter falling due to gravity when the cat litter drum performs unloading rotation, the cat litter is temporarily stored in the sand holding channel, a sand supplement hole and a connecting space at the root of the sand supplement channel, and the clean cat litter is supplemented into the basin from the outer port of the sand supplement channel when the cat litter drum resets and rolls back. The sand supplement action can be completed by relying on the rotation of the drum itself, and additional electric sand adding components such as electromagnetic valves and screw pushers are not needed, so that the overall energy consumption of the equipment is obviously reduced, the number of sensors and control circuits is reduced, and the sand supplement power system does not need to be additionally arranged under the condition of meeting the automatic sand supplement demand.

Description

Technical Field

[0001] This invention relates to the field of intelligent pet cat litter technology, and in particular to a sand-filling mechanism for an automated roller litter box and the roller litter box itself. Background Technology

[0002] Currently, smart litter boxes are widely used in the pet supplies industry. They can automatically clean up litter clumps, reducing the daily grooming burden on pet owners. However, litter will gradually decrease as it clumps and sticks due to dirt and grime, affecting the pet's experience. Therefore, it is necessary to frequently replenish the litter box with clean litter as needed.

[0003] Traditional litter boxes require owners to manually add litter. Owners need to frequently check the litter level and add litter when necessary. This method heavily relies on the owner's judgment and operation, lacking automation. It not only fragments the owner's time but also significantly impacts their energy allocation. If the owner forgets or is too busy to add litter, the litter level will be insufficient. A thin layer of litter won't cover the excrement, resulting in a strong odor and severely discouraging the cat from using the litter box, thus negatively impacting the owner's pet ownership experience.

[0004] Based on this demand, cat litter boxes equipped with automated litter replenishment mechanisms have emerged on the market. These automated litter replenishment mechanisms typically use a weight sensor installed at the bottom of the litter box to monitor changes in the weight of the litter inside in real time. When the dirty litter in the litter box is automatically discharged until the weight of the remaining litter is below a preset threshold, the controller activates an independent electric litter replenishment mechanism (such as a solenoid valve or a screw feeder) to automatically replenish the litter, thus eliminating the tedious work of manually replenishing litter for pet owners.

[0005] However, in practical applications, it has been found that although this type of solution can achieve automated litter replenishment, the added electric litter filling mechanism not only increases the overall energy consumption of the equipment, making the structure and electronic control system of the automated litter box more complex, but also the electric litter filling mechanism is often heavy, which seriously affects the overall center of gravity of the litter box and makes it difficult to integrate with the existing litter box structure in a modular way. Summary of the Invention

[0006] Existing automated litter boxes suffer from drawbacks such as high energy consumption due to the electric litter filling mechanism, complex structure and electronic control system, and difficulty in modular integration with existing litter box structures. In view of at least one of the above technical problems, this invention provides a litter filling mechanism and litter box for use with a roller-type litter box. The design features a non-self-powered litter filling mechanism on the side of the roller-type litter box. Owners can store clean litter in the litter storage space. When the litter roller begins to rotate and expel dirty litter clumps, the rotating litter catching channel catches the litter that has rolled down due to gravity. The caught litter slides to the root of the catching channel, where the litter filling hole and the space at the root of the litter filling channel temporarily store the litter. When the litter roller returns to its original position, the clean litter temporarily stored in the space can be added to the litter box through the outer port of the litter filling channel, thus achieving automated litter filling without an additional power source. Modular integration with existing litter rollers is very convenient. The specific technical solution is as follows: A litter filling mechanism for a roller litter box includes a circular housing. A sealing plate is fitted on the inner side of the circular housing, creating a litter storage space between the sealing plate and the circular housing. A litter filling channel is provided on the side of the circular housing, connecting the external space and the litter storage space. The litter filling channel is fitted with a removable cover. A litter replenishment hole, connecting to the litter storage space, is provided on the sealing plate near the inner surface of the side wall of the circular housing. A litter collecting channel is provided inside the circular housing. The outer port of the litter collecting channel faces the same direction as the unloading rotation of the roller litter box. The outer port is attached to the inner side wall of the circular housing and connects to the litter storage space. The inner port is connected to the litter replenishment hole. A litter replenishment channel is connected inside the litter replenishment hole. The outer port of the litter replenishment channel faces the same direction as the outer port of the litter collecting channel. The diameter of the outer port of the litter replenishment channel is smaller than the diameter of the litter replenishment hole.

[0007] In some embodiments of this disclosure, the outer side of the dome housing is designed with a hollowed-out shape, and a light-transmitting cover plate is provided at the hollowed-out area.

[0008] In some embodiments of this disclosure, a fitting channel is provided at the center of the dome housing and the sealing plate, and an air purification device is provided in the fitting channel.

[0009] Furthermore, in some embodiments of this disclosure, the air purification device includes an air filter box and an exhaust fan. The air inlet of the air filter box is located inside the cavity of the roller litter box, and the exhaust fan is connected to the air outlet of the air filter box and to the circular housing.

[0010] In some embodiments of this disclosure, the sand-collecting channel is integrally formed with the circular housing.

[0011] In some embodiments of this disclosure, the channel axis of the sand-collecting channel is arc-shaped, and the sand-collecting channel is attached to the inner side wall of the circular cover housing, the inner side of the outer wall of the circular cover housing, and the outer side of the sealing plate.

[0012] In some embodiments of this disclosure, the circular housing and the sealing plate are connected by a plurality of screw fastening structures; the screw fastening structures include screw holes and screws, and the plurality of screw holes are disposed on the inner sidewall of the circular housing, one of which is disposed in front of the sand-collecting channel in the direction of sand collection.

[0013] In some embodiments of this disclosure, the channel axis of the sand replenishment channel is arc-shaped, and the sand replenishment channel is attached to the inner side of the sealing plate.

[0014] A roller-type cat litter box includes a cat litter roller and a litter filling mechanism for use with the roller-type cat litter box. The litter filling mechanism is connected to the side of the cat litter roller, and the circular housing is collinear with the rolling axis of the cat litter roller.

[0015] In some embodiments of this disclosure, the cat litter roller includes a round-shoulder cylindrical shell with a door hole on its surface, the outer port of the litter replenishment channel is located inside the round-shoulder cylindrical shell, and the projection of the outer port of the litter replenishment channel on the inner surface of the round-shoulder cylindrical shell is located at the round shoulder.

[0016] Compared with existing technologies, the above-mentioned litter box with roller-type litter box and litter box have the following advantages: This application sets up a sand storage space inside the circular housing and uses a sand-collecting channel to rotate along with the litter roller during the unloading swing to collect clean litter that rolls down due to gravity. The litter is temporarily stored in the sand-collecting channel, the sand-replenishing hole, and the connecting space at the root of the sand-replenishing channel. When the litter roller resets and rolls back, this portion of clean litter is replenished into the litter roller through the outer port of the sand-replenishing channel. The entire sand-replenishing action can be completed by the rotation of the litter roller itself, without the need for additional electric sand-adding components such as solenoid valves and screw feeders. This significantly reduces the overall energy consumption of the equipment, reduces the number of sensors and control circuits, and eliminates the need for an additional sand-replenishing power system while meeting the needs of automated sand replenishment. Because the power source for the independent electric litter filling mechanism is eliminated, the overall weight of the automated litter filling mechanism is greatly reduced, and it will not have a significant negative impact on the center of gravity of the litter box. The whole uses a disc-type module composed of a round cover shell, sealing plate and other components, which can be installed coaxially with the side of the litter roller. There is no need to make major changes to the main structure of the original roller litter box. The modular integration of the litter filling mechanism and the roller litter box is convenient, stable and has a wide range of applications. The outer port of the litter collection channel faces the opposite direction of the unloading rotation of the roller litter box. During the unloading rotation phase, the litter is collected by the change in the angle and posture of the cylinder. During the reverse reset phase, gravity is used to release the temporarily stored litter through the litter replenishment channel. The litter replenishment action is naturally embedded in the existing screening and unloading cleaning process. There is no need to set up special automated control logic or execution timing, which improves the reliability of operation and reduces the probability of malfunction. The outer port diameter of the litter replenishment channel is smaller than the diameter of the litter replenishment hole. The cat litter is buffered in the temporary storage space formed by the litter replenishment hole and the root of the litter replenishment channel. The litter replenishment channel forms a constriction guide section to prevent the cat litter from pouring out in large quantities during the reset process, resulting in a more even and appropriate amount of litter replenishment. The outer port of the litter replenishment channel is located inside the round shoulder cylinder shell and within the projection range of the round shoulder, ensuring that clean cat litter falls accurately into the litter usage area and avoiding spillage outside the device. The outer side of the round shell features a hollow design and is equipped with a light-transmitting cover. The owner can directly see the remaining cat litter in the litter storage space through the light-transmitting cover. There is no need to disassemble or repeatedly empty it, making it easy to add cat litter to the litter channel in a timely manner and reducing the burden of daily management. The air purification device installed at the center of the round cover and the sealing plate can actively draw out the odor-containing gas in the litter box cavity through the filter element and then discharge it to complete the air purification, thereby further improving the overall performance of the intelligent litter box. The litter collection channel is integrally formed with the round cover shell and is arranged in an arc shape against the inner side wall of the round cover shell and the outer side of the sealing plate. In the screw fastening structure, a screw hole post is specially set in front of the litter collection channel in the litter collection direction, which effectively enhances the local rigidity of the litter collection channel installation area and avoids deformation or displacement of the channel due to repeated cat litter load. This ensures the accuracy and consistency of litter collection and replenishment actions during long-term operation. At the same time, the setting of the cat litter post can limit the entry of cat litter dust into the cat litter roller to a certain extent. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the sand-adding mechanism of the roller-type cat litter box in the structure of the present invention from one perspective. Figure 2 This is a two-dimensional schematic diagram of the sand-adding mechanism of the roller-type cat litter box in the structure of the present invention, from a second perspective. Figure 3 This is a schematic diagram of the sealing plate in the structure of the present invention; Figure 4 This is a three-dimensional schematic diagram from the perspective of the cat litter roller and the litter adding mechanism in embodiment 3 of the present invention. Figure 5 This is a three-dimensional schematic diagram of the cat litter roller in embodiment 3 of the present invention, showing its internal view in conjunction with the sand-adding mechanism. The markings in the diagram are as follows: 1. Circular cover shell; 11. Sand filling channel; 12. Cover; 13. Sand collecting channel; 14. Light-transmitting cover plate; 15. Screw hole post; 2. Sealing plate; 21. Sand filling hole; 3. Sand filling channel; 4. Air purification device; 5. Circular shoulder shell. Detailed Implementation

[0018] To better understand the purpose, structure, and function of this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below. It should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit this application. The terms "comprising" and "having," and any variations thereof, are open-ended and intended to cover non-exclusive inclusion.

[0019] The component numbers used in this document are solely for distinguishing the objects described and have no sequential or technical meaning. The term "connection" in this disclosure, unless otherwise specified, includes both direct and indirect connections. It should be understood that directional terms such as "inner," "outer," "clockwise," and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for ease of description and do not indicate or imply that the device or unit referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0020] As shown in the attached diagram. Figures 1 to 5 As shown, a litter filling mechanism for a roller-type litter box is designed, including a circular housing 1, which is a cover-shaped component and can be made of plastic; a sealing plate 2 is provided on the inner side of the circular housing 1, which can be a lightweight structural plate, forming a litter storage space between the sealing plate 2 and the circular housing 1; a litter filling channel 11 is provided on the side of the circular housing 1, connecting the external space and the litter storage space, and the litter filling channel 11 is equipped with a removable cover 12, allowing the owner to add clean cat litter to be stored through the litter filling channel 11; the sealing plate... 2. A sand replenishment hole 21 is provided near the inner surface of the side wall of the circular housing 1, which connects to the sand storage space. A sand collection channel 13 is provided inside the circular housing 1. The outer port of the sand collection channel 13 faces the opposite direction of the unloading rotation of the roller litter box. The outer port is attached to the inner side wall of the circular housing 1 and connects to the sand storage space. The inner port is connected to the sand replenishment hole 21. A sand replenishment channel 3 is provided inside the sand replenishment hole 21. The outer port of the sand replenishment channel 3 faces the same direction as the outer port of the sand collection channel 13. The diameter of the outer port of the sand replenishment channel 3 is smaller than the diameter of the sand replenishment hole 21.

[0021] A roller-type litter box was also designed, including a litter roller. The oscillating transmission structure of the litter roller and the way dirty litter clumps are discharged are similar to the litter cradle structure described in the utility model patent CN223872990U, which describes a litter box base with a litter compartment cover and a cradle-type litter box. In this design, the outer surface of the litter roller is also provided with an arc-shaped rack for transmission. In this design, the litter roller also includes litter sieving components such as a litter sieve storage compartment. In addition, this design also includes the aforementioned litter filling mechanism, which is connected to the side of the litter roller. The circular cover shell is collinear with the rolling axis of the litter roller.

[0022] The above embodiments illustrate three examples of implementing the aforementioned technical solutions. The term "embodiment" as used herein means that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this application. The appearance of this phrase in various locations within the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. Where there is no conflict, the various embodiments in this application can be combined with each other.

[0023] Embodiment 1 discloses a litter filling mechanism for a roller-type litter box, including a circular housing 1. The circular housing 1 is a cover-shaped component. In this embodiment, the circular housing 1 is cylindrical in shape and made of plastic. A sealing plate 2 is provided on the inner side of the circular housing 1. The sealing plate 2 can be a lightweight structural plate, forming a litter storage space between the sealing plate 2 and the circular housing 1. The litter storage space is mainly used to store clean cat litter to be automatically added. A litter filling channel 11 is provided on the side of the circular housing 1, connecting the external space and the litter storage space. The litter filling channel 11 is equipped with a removable cover 12. The main purpose of the cover 12 is to prevent cat litter from flowing out of the litter filling channel when the litter filling mechanism rotates. The litter box 11 leaks out. After the owner removes the cap 12, they can add clean cat litter to the litter box through the litter adding channel 11. After adding litter, the cap 12 is replaced. In this embodiment, the outer end of the litter adding channel 11 is threaded, and the cap 12 is a threaded screw cap that fits into it. The sealing plate 2 is provided with a litter replenishment hole 21 near the inner surface of the side wall of the round cover 1, which connects to the litter storage space. The litter replenishment hole 21 is a polygonal hole, a round hole, or an elliptical hole with rounded corners. The inside of the round cover 1 is provided with a litter collecting channel 13. The outer end of the litter collecting channel 13 serves as a litter collecting opening, and its orientation is opposite to the unloading rotation direction of the roller litter box. The outer end is attached to the inner side wall of the round cover 1 and connects to the litter storage space. The inner port is connected to the litter filling hole 21; a litter filling channel 3 is connected to the inner side of the litter filling hole 21. The outer port of the litter filling channel 3 faces the same direction as the outer port of the litter collection channel 13. The diameter of the outer port of the litter filling channel 3 is smaller than the diameter of the litter filling hole 21. The cat litter is buffered in the temporary storage space formed at the root of the litter filling hole and the litter filling channel. The litter filling channel forms a constriction guide section to prevent the cat litter from pouring out in large quantities during the reset process, and the amount of litter added is more even and appropriate. When the cat litter roller starts to rotate to perform the action of expelling dirty cat litter clumps, the litter collection channel 13, which rotates accordingly, can catch the litter that rolls down due to gravity from the side wall of the litter storage space. As the litter roller continues to rotate, the litter caught by the outer port of the litter collection channel 13 slides to the root of the litter collection channel 13. Some of the litter that slides down will directly enter the root of the litter replenishment channel 3 through the litter replenishment hole 21. The litter that flows in later will also slide down the small slope formed by the litter that flowed in earlier to accumulate in the connecting space between the litter replenishment hole 21 and the root of the litter replenishment channel 3, forming a temporary storage. When the litter roller performs the reset and rewind operation, the clean litter temporarily stored at the root of the litter replenishment channel 3 can be replenished into the litter box through the outer port of the litter replenishment channel, thereby realizing automatic litter filling without an additional power source. It is very convenient to integrate with the existing modular litter rollers.

[0024] In this embodiment, the channel axis of the sand-collecting channel 13 is straight, and the channel axis is arranged along one chord of the circular housing 1. The outer port of the sand-collecting channel 13 is a bevel towards the center. The channel axis of the sand-filling channel 3 is also arranged along one chord of the circular housing 1. The channel axis is located within the arc-shaped area formed by the channel axis of the sand-collecting channel 13. The circular housing 1 and the sealing plate 2 are connected and cooperated by a snap-fit ​​structure. That is, the edge of the circular housing 1 is integrally provided with a clip, and the sealing plate 2 is provided with a snap hole that cooperates with the clip.

[0025] This embodiment also discloses a roller-type litter box, including a litter roller that can swing in a pendulum-like manner to discharge litter balls. The side of the litter roller is provided with a door-like passage for the pet cat to enter and exit. The swing transmission structure of the litter roller and the way dirty litter balls are discharged are similar to the litter cradle structure described in the utility model patent CN223872990U, which describes a litter box base with a litter compartment cover and a cradle-type litter box. In this design, the outer surface of the litter roller is also provided with an arc-shaped toothed rack for rolling transmission. In this design, the litter roller also includes litter sieving components such as a litter sieve and storage compartment. In addition, this design also includes the aforementioned litter adding mechanism, which is connected to the side of the litter roller. The circular cover is collinear with the rolling axis of the litter roller.

[0026] Example 2 discloses a litter filling mechanism. The difference between this example and Example 1 is that the outer side of the circular housing 1 is designed with a hollowed-out shape, and a light-transmitting cover 14 is provided at the hollowed-out area. The light-transmitting cover 14 can be a transparent acrylic sheet, which is fixed to the circular housing 1 by bonding or snap-fitting. The owner can directly see the remaining amount of cat litter in the litter storage space through the light-transmitting cover 14 without disassembling or repeatedly emptying it, which makes it easy to replenish cat litter in the litter storage space in a timely manner and reduces the burden of daily management.

[0027] like Figures 1 to 5 As shown, Embodiment 3 discloses a litter filling mechanism. The difference between this embodiment and Embodiment 2 is that a fitting channel is provided at the center of the circular housing 1 and the sealing plate 2, and an air purification device 4 is installed in the fitting channel. The air purification device 4 includes an air filter box and an exhaust fan. The air inlet of the air filter box is located in the cavity of the roller litter box. The exhaust fan is connected to the air outlet of the air filter box and connected to the circular housing 1. When the exhaust fan is turned on, the gas in the litter roller can be extracted through the air filter, and relatively odorless air from outside will be replenished from the pet cat inlet / outlet channel of the litter roller, thereby realizing the air replacement inside the litter roller.

[0028] The litter collection channel 13 and the circular housing 1 are integrally formed and can both be made of plastic. This makes them lightweight and reduces the transmission burden on the litter roller.

[0029] The sand-collecting channel 13 has an arc-shaped channel axis and is attached to the inner wall of the circular cover 1, the inner side of the outer wall of the circular cover 1, and the outer side of the sealing plate 2.

[0030] The circular housing 1 and the sealing plate 2 are connected by a screw fastening structure. The screw fastening structure includes a screw post 15 and a screw. Several screw posts 15 are respectively located on the inner side wall of the circular housing 1. One of the screw posts 15 is located in front of the sand-collecting channel 13 in the direction of sand collection. The protrusion of the screw post 15 on the side wall of the circular housing 1 can limit the cat litter dust from entering the sand-collecting channel 13 to a certain extent.

[0031] The channel axis of the sand replenishment channel 3 is arc-shaped. The sand replenishment channel 3 is attached to the inner side of the sealing plate 2. In this embodiment, the channel axis of the sand replenishment channel 3 coincides with the projection of the channel axis of the sand collection channel 13.

[0032] A roller-type cat litter box is also disclosed. The difference between this embodiment and Embodiment 1 is that the cat litter roller includes a round-shoulder cylindrical shell 5 with a door hole on the cylindrical surface. The outer port of the litter replenishment channel 3 is located inside the round-shoulder cylindrical shell 5. The projection of the outer port of the litter replenishment channel 3 on the inner surface of the round-shoulder cylindrical shell 5 is located at the round shoulder. This allows the cat litter discharged from the outer port of the litter replenishment channel 3 to first fall to the arc surface to form a force-relieving effect. Then, it is spread evenly by the swing of the cat litter roller, which can effectively reduce the noise and splashing of cat litter.

[0033] It is understood that the above description is only for illustrating specific embodiments of this application, but the protection scope of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be covered within the scope of disclosure of this application.

Claims

1. A litter filling mechanism for use with a roller-type cat litter box, characterized in that: The device includes a circular housing (1), with a sealing plate (2) installed on the inner side of the circular housing (1) to form a sand storage space between the sealing plate (2) and the circular housing (1); the side of the circular housing (1) is provided with a sand filling channel (11) that connects the external space and the sand storage space, and the sand filling channel (11) is provided with a detachable cover (12); the sealing plate (2) is provided with a sand replenishment hole (21) that connects to the sand storage space near the inner surface of the side wall of the circular housing (1); the circular housing (1) is provided with a sand collecting channel (13), the outer port of the sand collecting channel (13) faces the opposite direction of the unloading rotation of the roller litter box, the outer port is attached to the inner side wall of the circular housing (1) and connects to the sand storage space, and the inner port is connected to the sand replenishment hole (21); a sand replenishment channel (3) is connected to the inner side of the sand replenishment hole (21), the outer port of the sand replenishment channel (3) is aligned with the outer port of the sand collecting channel (13), and the diameter of the outer port of the sand replenishment channel (3) is smaller than the diameter of the sand replenishment hole (21).

2. The sand-adding mechanism for a roller-type cat litter box according to claim 1, characterized in that, The outer side of the circular housing (1) is designed with a hollowed-out shape, and a light-transmitting cover plate (14) is provided at the hollowed-out area.

3. The sand-adding mechanism for a roller-type cat litter box according to claim 1, characterized in that, An assembly channel is provided at the center of the circular housing (1) and the sealing plate (2), and an air purification device (4) is provided in the assembly channel.

4. The sand-adding mechanism for a roller-type cat litter box according to claim 3, characterized in that, The air purification device (4) includes an air filter box and an exhaust fan. The air inlet of the air filter box is located in the cavity of the roller litter box, and the exhaust fan is connected to the air outlet of the air filter box and connected to the round cover housing (1).

5. The sand-adding mechanism for a roller-type cat litter box according to claim 1, characterized in that, The sand-collecting channel (13) is integrally formed with the circular shell (1).

6. The sand-adding mechanism for a roller-type cat litter box according to claim 1, characterized in that, The channel axis of the sand-collecting channel (13) is arc-shaped. The sand-collecting channel (13) is attached to the inner wall of the round cover shell (1), the inner side of the outer wall of the round cover shell (1), and the outer side of the sealing plate (2).

7. The sand-adding mechanism for a roller-type cat litter box according to claim 1, characterized in that, The circular housing (1) and the sealing plate (2) are connected by a screw fastening structure. The screw fastening structure includes a screw hole post (15) and a screw. Several screw holes post (15) are respectively located on the inner side wall of the circular housing (1), and one of the screw holes post (15) is located in front of the sand-collecting channel (13) in the sand-collecting direction.

8. The sand-adding mechanism for a roller-type cat litter box according to claim 1, characterized in that, The channel axis of the sand replenishment channel (3) is arc-shaped, and the sand replenishment channel (3) is attached to the inner side of the sealing plate (2).

9. A roller-type cat litter box, comprising a litter roller, characterized in that, It also includes the sand-adding mechanism for the rolling litter box described in any of the above items, wherein the sand-adding mechanism is connected to the side of the litter roller, and the round cover (1) is collinear with the rolling axis of the litter roller.

10. The roller-type cat litter box according to claim 9, characterized in that, The cat litter roller includes a round-shoulder cylindrical shell (5) with a door hole on the cylindrical surface. The outer port of the litter replenishment channel (3) is located inside the round-shoulder cylindrical shell (5), and the projection of the outer port of the litter replenishment channel (3) on the inner surface of the round-shoulder cylindrical shell (5) is located at the round shoulder.

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