Cat litter basin

Abstract

The utility model discloses a cat litter basin, belongs to the field of cat litter basins, solves the problems that the whole structure of the cat litter basin is complex and the manufacturing cost is high, and adopts the technical scheme that the cat litter basin comprises a bracket and an inner cylinder placed on the bracket, an inner gear ring is arranged at the end of the inner cylinder, an output gear meshed with the inner gear ring is arranged at the output end of the driving mechanism and located on the inner side of the inner gear ring, the inner cylinder is provided with a rotating axis, and the meshing portion of the output gear and the inner gear ring is lower than the rotating axis. According to the cat litter box, the output gear is matched with the inner gear ring to limit the inner cylinder from being jacked upwards, it is guaranteed that the inner cylinder rotates more stably, and the overall structure of the cat litter box is simpler.

Description

Technical Field

[0001] The utility model discloses a cat litter box, belonging to the technical field of cat litter boxes. Background Art

[0002] As more and more people like to raise pet cats, it is necessary to frequently clean the feces of pet cats during the breeding process. However, the owners of pet cats do not have so much time to clean the cat litter box, and even feel annoyed about cleaning the cat litter box. Therefore, automatic cat litter boxes are widely loved by customers.

[0003] For example, a new type of fully automatic cat litter box is disclosed in CN218527171U, which includes a drum and a base. A driven gear is arranged at the second end of the drum, and a driving gear is arranged on the base. The driving gear is driven by a driving motor, and the driven gear meshes with the driving gear, so as to realize the automatic rotation of the cat litter box to clean the cat litter. However, in this patent, the driven gear is an external gear, and the driving gear is located below the driven gear. During the rotation of the drum, there is no limit in the upward direction of the drum, so that the drum is easily lifted upward, and the driven gear and the driving gear are prone to gear hobbing.

[0004] Another example is a cat litter box disclosed in CN216088191U, which includes a bracket and a rotating drum. A pet inlet is arranged at the first end of the rotating drum, and a rotating drum shaft is arranged at the other end. The bracket is provided with a support plate, and a bearing groove cooperating with the rotating drum shaft is arranged on the inner wall of the support plate facing the rotating drum, and the bearing groove forms a support for the coaxial rotation of the drum, so as to limit the drum from being lifted upward. However, in this patent, the arrangement of the rotating drum shaft and the support plate needs to be added, which makes the overall structure of the cat litter box more complex and the manufacturing cost higher. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the problem that the overall structure of the cat litter box is relatively complex and the manufacturing cost is high. For this reason, a cat litter box is provided. By the cooperation of the output gear and the internal tooth ring, the upward lifting of the inner cylinder is restricted, ensuring that the inner cylinder rotates more smoothly, and the overall structure of the cat litter box is also simpler.

[0006] To solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A cat litter box includes a bracket and an inner cylinder placed on the bracket. The bracket is provided with a driving mechanism for driving the inner cylinder to rotate. An internal tooth ring is arranged at the end of the inner cylinder, and an output gear meshing with the internal tooth ring is arranged at the output end of the driving mechanism. The output gear is located inside the internal tooth ring. The inner cylinder has a rotation axis, and the meshing part of the output gear and the internal tooth ring is lower than the rotation axis.

[0008] The beneficial effects of adopting the utility model are as follows:

[0009] In the present utility model, an internal gear ring is provided at the end of the inner cylinder. The output gear is located inside the internal gear ring and meshes with the internal gear ring. Moreover, the meshing part of the output gear and the internal gear ring is lower than the rotation axis. Therefore, the output gear is higher than the meshing part of the output gear and the internal gear ring. The output gear forms a limit on the inner cylinder in the vertically upward direction through the internal gear ring, thereby restricting the inner cylinder from being lifted, enabling the inner cylinder to maintain a stable fit with the bracket, and reducing the shaking amplitude of the inner cylinder. Additionally, the bracket supports the inner cylinder, the output gear forms a limit on the inner cylinder through the internal gear ring, and the bracket and the output gear clamp the inner cylinder, thereby stably positioning the inner cylinder on the bracket and reducing the possibility of the inner cylinder disengaging from the bracket, which is beneficial for transporting the litter box. Secondly, by forming a limit on the inner cylinder through the output gear, the setting of the rotating shaft can be omitted, thereby simplifying the overall structure of the litter box and reducing the manufacturing cost of the litter box.

[0010] Preferably, the internal gear ring has a first center of a circle, the output gear has a second center of a circle, and the connection line between the first center of a circle and the second center of a circle forms an angle A with the vertical direction, and 0 ≤ A ≤ 30°. With the foregoing technical solution, the position of the output gear is closer to the bottom of the internal gear ring, making the downward acting force of the output gear on the internal gear ring greater, improving the limiting ability of the output gear on the inner cylinder, further reducing the possibility of the inner cylinder disengaging from the bracket, and further improving the matching stability between the inner cylinder and the bracket. When A > 30°, the position of the output gear is higher, resulting in a smaller downward acting force of the output gear on the internal gear ring, reducing the limiting ability of the output gear on the inner cylinder, and making the inner cylinder easy to be lifted upward, causing the inner cylinder to easily generate a large shaking amplitude.

[0011] Preferably, the inner cylinder includes a rear cover, and the rear cover is detachably connected to one end of the inner cylinder. The internal gear ring is arranged on the side of the rear cover away from the inner cylinder and is distributed along the edge of the rear cover. The internal gear ring and the rear cover are of an integral structure. With the foregoing technical solution, the internal gear ring is arranged on the rear cover, and the rear cover is detachably connected to the inner cylinder, facilitating the repair and replacement of the internal gear ring. When the internal gear ring is damaged, there is no need to replace the entire inner cylinder, only the rear cover needs to be replaced, which can reduce material waste and the repair cost of the inner cylinder. Additionally, since the internal gear ring and the rear cover are of an integral structure, the connection between the internal gear ring and the rear cover can be more firm and reliable, ensuring the smooth rotation of the inner cylinder, and at the same time, it can also reduce the manufacturing difficulty of the internal gear ring and the rear cover and save the manufacturing cost.

[0012] Preferably, a U-shaped groove is provided on the upper side of the bracket, the inner cylinder is placed in the U-shaped groove, and a plurality of ball assemblies for guiding the rotation of the inner cylinder are arranged in the U-shaped groove. With the foregoing technical solution, the U-shaped groove can position the inner cylinder and improve the positioning stability of the inner cylinder. Additionally, the ball assemblies can guide the rotation of the inner cylinder, making the rotation of the inner cylinder smoother, being beneficial to the rotation of the inner cylinder, and at the same time, it can also reduce the energy consumption of the driving mechanism.

[0013] Preferably, at least two ball assemblies are provided in the installation groove, and two of the ball assemblies are symmetrically distributed on both sides of the inner cylinder, and the ball assemblies are arranged at the top end of the inner wall of the U-shaped groove. With the foregoing technical solution, by providing a plurality of ball assemblies, the pressure on each ball assembly can be reduced, the phenomenon of the ball assembly being stuck can be avoided, and the rotation of the inner cylinder can be made smoother; in addition, the ball assemblies are symmetrically arranged at the top end of the inner wall of the U-shaped groove, which can increase the distance between the two ball assemblies, improve the support stability of the ball assemblies for the inner cylinder, reduce the possibility of the inner cylinder disengaging from the bracket, and make the cooperation between the inner cylinder and the bracket more stable and reliable.

[0014] Preferably, the ball assembly includes a mounting seat and a ball rotatably connected to the mounting seat, and the ball protrudes partially from the mounting seat and contacts the circumferential surface of the inner cylinder. With the foregoing technical solution, the ball can rotate in any direction within the mounting seat, can guide the inner cylinder to rotate around the rotation axis, making the rotation of the inner cylinder smoother, and at the same time can also reduce the possibility of the ball being stuck; at the same time, the ball can also guide the inner cylinder to move in the opposite direction of the rotation axis, thereby making the installation and disassembly of the inner cylinder and the bracket more convenient and labor-saving.

[0015] Preferably, a chute is provided on the circumferential surface of the inner cylinder, and the chutes are distributed along the circumferential direction of the inner cylinder, and the balls are partially embedded in the chutes and are in sliding fit with the chutes. With the foregoing technical solution, the cooperation between the balls and the chutes can achieve the positioning of the ball assembly and the inner cylinder, reduce the possibility of the inner cylinder having an axial displacement, improve the positioning stability of the inner cylinder and the bracket, and make the overall structure of the litter box more stable and reliable.

[0016] Preferably, two chutes are provided on the circumferential surface of the inner cylinder, and the two chutes are respectively close to both ends of the inner cylinder. There are 4 ball assemblies in the U-shaped groove, and each chute is in sliding fit with two ball assemblies. With the foregoing technical solution, the two chutes are respectively close to both ends of the inner cylinder, which can further improve the positioning stability of the inner cylinder and reduce the possibility of the inner cylinder having an axial displacement.

[0017] Preferably, a positioning portion for positioning the mounting seat is provided in the U-shaped groove. With the foregoing technical solution, the positioning portion can position the mounting seat, making the installation of the ball assembly simpler and more convenient, and reducing the installation difficulty of the ball assembly.

[0018] Preferably, a baffle extending upward is provided on one side of the bracket close to the internal gear ring, and the driving mechanism is fixed to the side of the baffle away from the inner cylinder, and the output end of the driving mechanism penetrates through the baffle and is fixedly connected to the output gear. With the foregoing technical solution, the baffle can form an axial positioning for the inner cylinder, making the installation of the inner cylinder and the bracket simpler and faster, and reducing the installation difficulty of the inner cylinder.

[0019] Other features and advantages of the present utility model will be disclosed in detail in the following specific embodiments and drawings. Description of the Drawings

[0020] The present utility model will be further described below in conjunction with the drawings:

[0021] Figure 1 Structural schematic of the bracket and the inner cylinder in a cat litter box of the present utility model Figure 1 ;

[0022] Figure 2 Connection schematic of the output gear and the internal gear ring in a cat litter box of the present utility model;

[0023] Figure 3 Exploded schematic of the bracket and the inner cylinder in a cat litter box of the present utility model;

[0024] Figure 4 is Figure 3 Partial enlarged view of part B in

[0025] Figure 5 Structural schematic of the bracket and the inner cylinder in a cat litter box of the present utility model Figure 2 ;

[0026] Figure 6 Cross-sectional view of a cat litter box of the present utility model.

[0027] Reference numerals: 1 inner cylinder, 11 rear cover, 111 internal gear ring, 12 sand leakage opening, 13 entrance, 14 storage plate, 15 sieve plate, 151 sieve holes, 16 cat litter bin, 161 collection bin, 17 rotation axis, 18 chute, 2 bracket, 21 baffle, 22 drive mechanism, 221 output gear, 23 U-shaped groove, 24 positioning part, 25 avoidance notch, 3 ball assembly, 31 mounting seat, 32 ball. Specific Embodiments

[0028] The technical solutions of the embodiments of the present utility model will be explained and described below in conjunction with the drawings of the embodiments of the present utility model. However, the following embodiments are only the preferred embodiments of the present utility model and not all of them. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present utility model.

[0029] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present utility model.

[0030] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality of" is two or more unless otherwise clearly defined.

[0031] In the present utility model, unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] As Figures 1 to 6 shown, this embodiment shows a litter box, which includes a housing, a bracket 2 fixed inside the housing, and an inner cylinder 1 placed on the bracket 2. The inner cylinder 1 is generally cylindrical and has a rotation axis 17. The circumferential side surface of the inner cylinder 1 is placed on the bracket 2, and the rotation axis 17 is horizontally placed. One end of the inner cylinder 1 is provided with an entrance 13 for a cat to enter, and an internal gear ring 111 is installed on the outer surface of the other end. The bracket 2 is provided with a driving mechanism 22 for driving the inner cylinder 1 to rotate. The output end of the driving mechanism 22 is provided with an output gear 221 that meshes with the internal gear ring 111. The output gear 221 is inside the internal gear ring 111, and the top end of the output gear 221 is lower than the rotation axis 17.

[0033] In this embodiment, the output gear 221 meshes with the internal gear ring 111. When the driving mechanism 22 is started, the driving mechanism 22 drives the internal gear ring 111 to rotate through the output gear 221, thereby controlling the rotation of the inner cylinder 1. Since the meshing part of the output gear 221 and the internal gear ring 111 is lower than the rotation axis 17, the output gear 221 is higher than the meshing position of the output gear 221 and the internal gear ring 111. The output gear 221 is fixed to the bracket 2 along with the driving mechanism 22. Therefore, the output gear 221 acts on the internal gear ring 111 and can form a limit on the inner cylinder 1 in the vertically upward direction, thereby restricting the inner cylinder 1 from being lifted up, keeping the inner cylinder 1 and the bracket 2 in stable cooperation, and reducing the shaking amplitude of the inner cylinder 1. In addition, the bracket 2 supports the inner cylinder 1, the output gear 221 forms a limit on the inner cylinder 1 through the internal gear ring 111, and the bracket 2 and the output gear 221 clamp the inner cylinder 1, thereby positioning the inner cylinder 1 stably on the bracket 2 and reducing the possibility of the inner cylinder 1 detaching from the bracket 2, which is beneficial for transporting the litter box. Secondly, by forming a limit on the inner cylinder 1 through the output gear 221, the setting of the rotating shaft can be omitted, thereby simplifying the overall structure of the litter box and reducing the manufacturing cost of the litter box.

[0034] As Figure 2 shown, in this embodiment, the internal gear ring 111 has a first center of circle, the output gear 221 has a second center of circle, the connection line between the first center of circle and the second center of circle forms an angle A with the vertical direction, and 0 ≤ A ≤ 30°. At this time, the position of the output gear is closer to the bottom of the internal gear ring 111, making the downward force of the output gear 221 on the internal gear ring 111 greater, improving the limiting ability of the output gear 221 on the inner cylinder 1, further reducing the possibility of the inner cylinder 1 detaching from the bracket 2, and further improving the cooperation stability between the inner cylinder 1 and the bracket 2. When A > 30°, the position of the output gear 221 is higher, making the downward force of the output gear 221 on the internal gear ring 111 smaller, reducing the limiting ability of the output gear 221 on the inner cylinder 1, making the inner cylinder 1 easy to be lifted up, and causing the inner cylinder 1 to be prone to a large shaking amplitude.

[0035] As Figures 1 to 3As shown in the figure, at one end of the inner cylinder 1 away from the inlet 13 in this embodiment, a rear cover 11 is provided. A number of positioning holes are provided at the edge of the rear cover 11. On the side of the inner cylinder 1 facing the rear cover 11, positioning posts that cooperate with the positioning holes are provided. Threaded holes are provided at the ends of the positioning posts. When the rear cover 11 and the inner cylinder 1 are installed, the positioning holes are aligned with the positioning posts, and the positioning posts are inserted into the positioning holes. Then, screws are used to threadedly connect with the positioning posts, thereby realizing the detachable connection between the rear cover 11 and the inner cylinder 1. Through the plug-in cooperation between the positioning posts and the positioning holes, the positioning of the rear cover 11 can be realized, thereby reducing the installation difficulty of the screws and being conducive to improving the installation efficiency of the rear cover 11 and the inner cylinder 1. In addition, the rear cover 11 and the inner cylinder 1 are detachably connected, so as to facilitate the maintenance and replacement of the internal gear ring 111. When the internal gear ring 111 is damaged, it is not necessary to replace the entire inner cylinder 1. Only the rear cover 11 needs to be replaced, which can reduce the waste of materials and the maintenance cost of the inner cylinder 1.

[0036] In this embodiment, the internal gear ring 111 is arranged on the side of the rear cover 11 away from the inner cylinder 1 and is distributed along the edge of the rear cover 11. And the internal gear ring 111 and the rear cover 11 are of an integral structure. The internal gear ring 111 is arranged along the edge of the rear cover 11, which can increase the diameter of the internal gear ring 111, and then reduce the rotation speed of the internal gear ring 111, which is conducive to improving the rotation stability of the inner cylinder 1 and can avoid the cat litter inside the inner cylinder 1 from splashing due to the too fast rotation of the inner cylinder 1. Secondly, the internal gear ring 111 and the rear cover 11 being of an integral structure can make the connection between the internal gear ring 111 and the rear cover 11 more firm and reliable, ensure the smooth rotation of the inner cylinder 1, and at the same time can also reduce the manufacturing difficulty of the internal gear ring 111 and the rear cover 11 and save the manufacturing cost.

[0037] As Figure 3 As shown in the figure, on the upper surface of the bracket 2 in this embodiment, a U-shaped groove 23 is provided. The shape of the U-shaped groove 23 matches the circumferential side surface of the inner cylinder 1, so that the inner cylinder 1 can be placed into the U-shaped groove 23, which is conducive to improving the positioning ability of the inner cylinder 1 and reducing the possibility of the inner cylinder 1 disengaging from the bracket 2. A ball component 3 for guiding the rotation of the inner cylinder 1 is provided in the U-shaped groove 23. The ball component 3 can guide the rotation of the inner cylinder 1, make the rotation of the inner cylinder 1 smoother, be conducive to the rotation of the inner cylinder 1, and at the same time can also reduce the energy consumption of the driving mechanism 22.

[0038] In this embodiment, there are 4 ball assemblies 3 provided in the U-shaped groove 23. Every two ball assemblies 3 form a group. The two ball assemblies 3 in the same group are symmetrically distributed on both sides of the inner cylinder 1, and the two ball assemblies 3 are symmetrically arranged at the top end of the inner wall of the U-shaped groove 23. By providing multiple ball assemblies 3, the pressure on each ball assembly 3 can be reduced, and the phenomenon that the ball assemblies 3 are stuck can be avoided, making the rotation of the inner cylinder 1 smoother. In addition, the ball assemblies 3 are symmetrically arranged at the top end of the inner wall of the U-shaped groove 23, which can increase the distance between the two ball assemblies 3, improve the support stability of the ball assemblies 3 for the inner cylinder 1, reduce the possibility of the inner cylinder 1 disengaging from the bracket 2, and make the cooperation between the inner cylinder 1 and the bracket 2 more stable and reliable. It should be noted that in other embodiments, the ball assemblies 3 can be provided with only one group, or more than two groups. Of course, it can be understood that the number of ball assemblies 3 in each group can also be more than two.

[0039] As Figure 4 shown, in this embodiment, the ball assembly 3 includes a mounting seat 31 and a ball 32 rotatably connected to the mounting seat 31. There is a mounting groove provided in the U-shaped groove 23, and a positioning portion 24 for positioning the mounting seat 31 is provided in the mounting groove. The positioning portion 24 includes two positioning ribs, and a positioning interval for placing the positioning seat is formed between the two positioning ribs. During the process of installing the ball assembly 3, the mounting seat 31 is placed into the positioning interval, and then the mounting seat 31 is fixed in the U-shaped groove 23 through a fastener. The positioning portion 24 can position the mounting seat 31, making the installation of the ball assembly 3 simpler and more convenient, and reducing the installation difficulty of the ball assembly 3.

[0040] In this embodiment, a receiving cavity for receiving the ball 32 is provided in the mounting seat 31, and an opening for partially exposing the ball 32 is provided at the top end of the mounting seat 31. The diameter of the opening is smaller than the diameter of the ball 32, which can further limit the ball 32 from disengaging from the mounting seat 31. At the same time, the ball 32 can rotate in any direction within the mounting seat 31. When the mounting seat 31 is fixed to the positioning portion 24, part of the ball 32 is higher than the bottom surface of the U-shaped groove 23 and contacts the circumferential side surface of the inner cylinder 1. When the driving mechanism 22 drives the inner cylinder 1 to rotate, the ball 32 can rotate with the inner cylinder 1, thereby guiding the inner cylinder 1 to rotate around the rotation axis 17, making the rotation of the inner cylinder 1 smoother, and at the same time, reducing the possibility of the ball 32 being stuck.

[0041] When the inner cylinder 1 needs to be installed, the inner cylinder 1 is inserted along the installation hole of the outer shell and moved along the axial direction of the inner cylinder 1, so that the outer peripheral side of the inner cylinder 1 contacts the ball 32. During the insertion process of the inner cylinder 1, the ball 32 generates rolling friction with the outer peripheral side of the inner cylinder 1, and the rolling direction of the ball 32 is the same as the moving direction of the inner cylinder 1. Furthermore, the ball 32 can guide the insertion of the inner cylinder 1, making the insertion of the inner cylinder 1 more convenient and labor-saving, and helping to improve the installation efficiency of the inner cylinder 1; the disassembly process of the inner cylinder 1 is similar to the installation process of the inner cylinder 1, and will not be elaborated here one by one.

[0042] As Figure 1 and Figure 3 shown, in this embodiment, an annular chute 18 is provided on the circumferential side of the inner cylinder 1. The chute 18 is distributed along the circumferential direction of the inner cylinder 1. The ball 32 is partially embedded in the chute 18 and is slidably engaged with the chute 18. When the driving mechanism 22 drives the inner cylinder 1 to rotate, the ball 32 and the chute 18 cooperate to axially position the inner cylinder 1, reduce the possibility of axial displacement of the inner cylinder 1, improve the positioning stability between the inner cylinder 1 and the bracket 2, and make the overall structure of the litter box more stable and reliable; in addition, during the installation process of the inner cylinder 1, when the ball 32 is embedded in the chute 18, the cooperation between the ball 32 and the chute 18 can generate resistance to the movement of the inner cylinder 1, and the installer can clearly perceive that the inner cylinder 1 has been installed in place, which is beneficial to improving the installation efficiency of the inner cylinder 1.

[0043] In order to further improve the positioning stability of the inner cylinder 1, in this embodiment, two chutes 18 are provided on the circumferential side of the inner cylinder 1, and the two chutes 18 are respectively close to both ends of the inner cylinder 1. Each chute 18 is slidably engaged with two ball assemblies 3; in addition, a baffle 21 extending upward is provided on one side of the bracket 2 close to the rear cover 11. The driving mechanism 22 is fixed on the side of the baffle 21 away from the inner cylinder 1. The output end of the driving mechanism 22 penetrates the baffle 21 and is fixedly connected with the output gear 221. The driving mechanism 22 can adopt a driving motor. The baffle 21 can axially position the inner cylinder 1, make the installation of the inner cylinder 1 and the bracket 2 simpler and faster, and reduce the installation difficulty of the inner cylinder 1.

[0044] As Figures 4 to 6As shown in the figure, in this embodiment, a cat litter bin 16 for placing cat litter is formed inside the inner cylinder 1, and the cat litter bin 16 is communicated with the entrance 13. Both the cat and the cat litter can enter the cat litter bin 16 from the entrance 13. A sand leakage opening 12 is provided on the circumferential side surface of the inner cylinder 1, and an avoidance notch 25 is provided at the bottom of the U-shaped groove 23. When the sand leakage opening 12 rotates to the lowest end along with the inner cylinder 1, the sand leakage opening 12 is aligned with the avoidance notch 25. A storage plate 14 and a sieve plate 15 are provided in the cat litter bin 16. One side of the storage plate 14 is fixed to the edge of the sand leakage opening 12. The storage plate 14 can guide the movement towards the sand leakage opening 12, thereby reducing the residual caking. The other side is connected to the sieve plate 15. Both the storage plate 14 and the sieve plate 15 are distributed along the axial direction of the inner cylinder 1, and together with a part of the inner wall of the inner cylinder 1, they enclose a collection bin 161. A plurality of sieve holes 151 are provided on the sieve plate 15. The collection bin 161 is communicated with the cat litter bin 16 through the sieve holes 151. The width of the sieve holes 151 is greater than the diameter of the cat litter and less than the diameter of the caking.

[0045] As Figure 6 shown, when there is a large amount of caking in the cat litter bin 16, the driving mechanism 22 is started to drive the output gear 221 to rotate. The output gear 221 cooperates with the internal gear ring 111 to drive the inner cylinder 1 to rotate counterclockwise. During the rotation, the cat litter enters the collection bin 161 through the sieve holes 151, while the caking cannot pass through the sieve holes 151 and stays on the surfaces of the sieve plate 15 and the storage plate 14. When the sand leakage opening 12 moves to the lowest end along with the inner cylinder 1, the caking leaves the inner cylinder 1 through the sand leakage opening 12 and falls into the garbage bin under the bracket 2 through the avoidance notch 25, thereby completing the collection of the caking; then the driving mechanism 22 controls the inner cylinder 1 to rotate in the reverse direction ( Figure 6 the clockwise direction in the figure), so that the cat litter in the collection bin 161 returns to the cat litter bin 16 through the sieve holes 151.

[0046] The above is only the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the content described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. A cat litter box, comprising a bracket and an inner cylinder placed on the bracket, wherein the bracket is provided with a driving mechanism for driving the inner cylinder to rotate, and is characterized in that: An internal gear ring is provided at the end of the inner cylinder, and an output gear meshing with the internal gear ring is provided at the output end of the drive mechanism. The output gear is located inside the internal gear ring. The inner cylinder has a rotation axis, and the meshing part of the output gear and the internal gear ring is lower than the rotation axis.

2. The litter box according to claim 1, wherein: The internal gear ring has a first center of circle, and the output gear has a second center of circle. The line connecting the first center of circle and the second center of circle forms an angle A with the vertical direction, and 0 ≤ A ≤ 30°.

3. The litter box according to claim 1, wherein: The inner cylinder includes a rear cover which is detachably connected to one end of the inner cylinder. The internal gear ring is arranged on the side of the rear cover away from the inner cylinder and is distributed along the edge of the rear cover. The internal gear ring and the rear cover are of an integral structure.

4. The litter box according to claim 1, wherein: A U-shaped groove is provided on the upper side of the bracket. The inner cylinder is placed in the U-shaped groove, and several ball assemblies for guiding the rotation of the inner cylinder are provided in the U-shaped groove.

5. A litter box according to claim 4, characterized in that: At least two ball assemblies are provided in the U-shaped groove. Two of the ball assemblies are symmetrically distributed on both sides of the inner cylinder, and the ball assemblies are arranged at the top of the inner wall of the U-shaped groove.

6. The litter box according to claim 4, characterized in that: The ball assembly includes a mounting seat and a ball rotatably connected to the mounting seat. The ball protrudes partially from the mounting seat and contacts the circumferential surface of the inner cylinder.

7. A litter box according to claim 6, characterized in that: A chute is provided on the circumferential surface of the inner cylinder. The chute is distributed along the circumferential direction of the inner cylinder. The ball is partially embedded in the chute and is in sliding fit with the chute.

8. The litter box according to claim 7, wherein: Two chutes are provided on the circumferential surface of the inner cylinder, and the two chutes are respectively close to both ends of the inner cylinder. Four ball assemblies are provided in the U-shaped groove, and each chute is in sliding fit with two ball assemblies.

9. The litter box according to claim 6, wherein: A positioning portion for positioning the mounting seat is provided in the U-shaped groove.

10. A cat litter box according to claim 1, characterized in that: A baffle extending upward is provided on the side of the bracket close to the internal gear ring. The drive mechanism is fixed to the side of the baffle away from the inner cylinder, and the output end of the drive mechanism penetrates through the baffle and is fixedly connected to the output gear.

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