Roller suspension rotation transmission assembly and open type cat litter basin

Abstract

The invention relates to the technical field of cat litter basins, in particular to a roller suspension rotation transmission assembly and an open type cat litter basin. The roller suspension rotation transmission assembly comprises a roller, an upper shell, a lower shell, a gearbox and a sand leakage net. The upper shell is detachably arranged on the lower shell, and an exhaust port of the upper shell is right opposite to a bottom port of the lower shell; the first end of the upper shell is provided with a rotating shaft of the gearbox, and the second end of the upper shell is provided with an arc-shaped roller rail. The sand leakage net is arranged on one side of the roller in the width direction; one end of the roller is provided with a matching wheel, and the other end is provided with an arc-shaped limiting guide rail; the matching wheel is rotationally propped against the roller supporting wheel; a roller on the limiting guide rail is rotatably arranged on a roller track of the upper shell; the protruding block of the rotating shaft can be embedded into the notch of the matching wheel so that the roller can be driven to turn over through rotation of the rotating shaft of the gear box. The cat litter cleaning assembly is simple in structure, convenient to operate and capable of efficiently and rapidly cleaning cat litter.

Description

Technical Field

[0001] The present invention relates to the technical field of cat litter boxes, in particular to a drum suspension rotary transmission assembly and an open cat litter box. Background Art Existing open cat litter boxes require manual separation of cat litter and manual shoveling of feces with a shovel; other types of automatic feces shoveling products are large in size, suitable for cats of limited size, and are expensive. Summary of the Invention

[0002] The objects of the present invention include, for example, providing a drum-suspended rotary transmission assembly and an open cat litter box, which have a simple structure, are easy to operate, and can efficiently and quickly clean cat litter.

[0003] The embodiments of the present invention can be implemented as follows: In a first aspect, the present invention provides a drum suspension rotation transmission assembly, comprising: Drum, upper shell, lower shell, gear box, sand leakage screen; The upper shell is detachably mounted on the lower shell, and the inner wall of the upper shell and the inner wall of the lower shell enclose a receiving space; the bottom of the upper shell has a through discharge port, and the bottom of the lower shell has a through bottom opening; the bottom opening is opposite to the discharge port; Along the length direction of the upper shell, the upper shell has a first end and a second end opposite to each other; The gear box is located in the accommodation space, and the rotating shaft of the gear box passes through the first end and extends into the inner cavity of the upper shell; the second end of the upper shell has an arc-shaped roller track; Along the length direction of the drum, one end of the drum is provided with a matching wheel, and the other end is provided with an arc-shaped limiting guide rail; the matching wheel is opposite to the first end, and the limiting guide rail is opposite to the second end; the sand leakage net is provided on one side of the width direction of the drum; The roller support wheel is located at the first end, and the roller support wheel is rotatably matched with the outer wall of the matching wheel; a roller is provided at the bottom of the limiting guide rail, and the roller is rotatably provided in the roller track; The rotating shaft includes a convex block, and the matching wheel has a concave hole with an opening facing downwards; the convex block can be embedded in the concave hole, so as to drive the roller to turn over through the rotating shaft of the gear box.

[0004] In an optional embodiment, the protrusion has parallel side surfaces and an arc-shaped top surface connecting the two side surfaces respectively; The recess has two relatively parallel side walls, and the two side walls are matched with the side surfaces in a one-to-one manner; the bottom of the recess has an arc-shaped groove bottom; When the protrusion is embedded in the recess, the side wall abuts against the corresponding side wall, and the arc-shaped top surface abuts against the bottom of the arc-shaped groove.

[0005] In an optional embodiment, the recess has a matching piece, and the matching piece is arranged on the bottom of the arc-shaped groove; the arc-shaped top surface of the protrusion has a card slot, and the matching piece can be snapped into the card slot.

[0006] In an optional embodiment, a rotating support wheel is further included; the rotating support wheel is arranged at the second end of the upper shell, and the rotating support wheel is located above the roller track; The limiting guide rail is provided with a limiting track, and the limiting track extends in an arc shape; When the roller of the drum falls into the roller track, the rotating support wheel is embedded in the limiting track, and the rotating support wheel and the limiting track are rotatably matched.

[0007] In an optional embodiment, the limiting guide rail includes an inner rail and an outer rail; the inner rail and the outer rail are both arc-shaped, and the outer rail is located radially outside the inner rail; the roller is arranged along the circumference of the outer rail, and the roller is located at the bottom of the outer rail; The limiting guide rail is arranged on the outer wall of the drum; the inner rail, the outer rail and the outer wall of the drum are enclosed to form a limiting rail.

[0008] In an optional embodiment, the outer rail includes a middle portion and two outer end portions; Along the extension direction of the outer rail, the two outer end portions are symmetrically arranged on both sides of the middle portion; a spacing is maintained between the middle portion and each of the outer end portions to form a mounting channel.

[0009] In an optional embodiment, a reinforcing plate is further included; the reinforcing plate extends in an arc shape, and a plurality of connecting columns are provided on the reinforcing plate, and the plurality of connecting columns are arranged along the extension direction of the reinforcing plate; The number of the plurality of roller support wheels is the same as the number of the plurality of connecting posts, and they correspond one to one; each of the roller support wheels is arranged on a corresponding connecting post; The reinforcing plate is located on the outer wall of the upper shell. After the connecting column passes through the upper shell, the roller supporting wheels are all located in the inner cavity of the upper shell. The plurality of roller supporting wheels are all in contact with the outer peripheral wall of the matching wheel.

[0010] In an optional embodiment, the bottom of the roller track has a plurality of sand leakage holes, and the sand leakage holes penetrate to the inner wall of the upper shell.

[0011] In an optional embodiment, the inner wall of the upper shell transitions to the discharge outlet in an arc shape.

[0012] In a second aspect, the present invention provides an open cat litter box, comprising the drum suspension rotary transmission assembly according to any one of the aforementioned embodiments.

[0013] The beneficial effects of the embodiments of the present invention include, for example: The present invention relates to a drum-suspended rotary transmission assembly comprising a drum, an upper shell, a lower shell, a gearbox, and a sand filter. The upper shell is detachably mounted on the lower shell, with the discharge port of the upper shell facing the bottom port of the lower shell. The upper shell has a gearbox shaft at the first end, and an arc-shaped roller track at the second end. The sand filter is disposed on one side of the drum in the width direction. The drum has a mating wheel at one end and an arc-shaped limiting guide rail at the other end. The mating wheel and the drum support wheel are rotatably engaged with each other. The roller on the limiting guide rail is rotatably mounted on the roller track of the upper shell. The protrusion of the shaft can engage the recess of the mating wheel, thereby rotating the gearbox shaft and driving the drum to flip. Specifically, the drum is rotatably supported on the upper shell at both ends in the longitudinal direction, and the gearbox can drive the drum to flip, dumping the cat litter in the drum through the discharge port and the bottom port, thereby achieving mechanized cat litter cleaning. This drum-suspended rotary transmission assembly has the advantages of simple structure, easy operation, and efficient and rapid cat litter cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 This is a structural schematic diagram of a drum suspension rotation transmission assembly according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the assembly of a drum suspension rotation transmission assembly according to an embodiment of the present invention; Figure 3 This is a schematic structural diagram of a gearbox of a drum suspension rotation transmission assembly according to an embodiment of the present invention; Figure 4 This is a schematic structural diagram of a matching wheel of a drum suspension rotation transmission assembly according to an embodiment of the present invention; Figure 5 This is a schematic structural diagram of the upper and lower shells of the drum suspension rotation transmission assembly according to an embodiment of the present invention; Figure 6 A schematic structural diagram of the upper and lower shells of the drum suspension rotation transmission assembly according to an embodiment of the present invention from another perspective; Figure 7 This is a structural schematic diagram of a drum of a drum suspension rotation transmission assembly according to an embodiment of the present invention; Figure 8 A structural schematic diagram of the drum of the drum suspension rotation transmission assembly according to an embodiment of the present invention from another perspective; Figure 9 It is a partial cross-sectional view of a drum suspension rotation transmission assembly according to an embodiment of the present invention.

[0016] Icons: 11-accommodation space; 12-sand leakage net; 100-drum; 200-upper shell; 201-discharge outlet; 210-first end; 220-second end; 230-roller track; 233-sand leakage hole; 300-lower shell; 301-bottom; 400-gear box; 410-rotating shaft; 420-bump; 421-side; 422-arc-shaped top surface; 423-slot; 500- Mating wheel; 520-notch; 521-side wall; 522-arc groove bottom; 523-mating piece; 600-limiting guide rail; 601-limiting rail; 610-inner rail; 620-outer rail; 621-middle part; 622-outer end part; 623-installation channel; 630-roller; 640-rotating support wheel; 710-reinforcement plate; 720-connecting column; 730-roller support wheel. DETAILED DESCRIPTION

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0019] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0020] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0021] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0022] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0023] Please refer to Figures 1 to 9 , this embodiment provides a drum suspension rotation transmission assembly, including a drum 100, an upper shell 200, a lower shell 300, a gear box 400, and a sand leakage net 12; The upper shell 200 is detachably mounted on the lower shell 300 , and the inner wall of the upper shell 200 and the inner wall of the lower shell 300 enclose a receiving space 11 ; the bottom of the upper shell 200 has a through discharge port 201 , and the bottom of the lower shell 300 has a through bottom opening 301 ; the bottom opening 301 is directly opposite to the discharge port 201 ; Along the length direction of the upper shell 200 , the upper shell 200 has a first end 210 and a second end 220 opposite to each other; The gear box 400 is located in the accommodating space 11, and the rotating shaft 410 of the gear box 400 passes through the first end 210 and extends into the inner cavity of the upper shell 200; the second end 220 of the upper shell 200 has an arc-shaped roller track 230; Along the length direction of the drum 100, one end of the drum 100 has a matching wheel 500, and the other end is provided with an arc-shaped limiting guide rail 600; the matching wheel 500 is opposite to the first end 210, and the limiting guide rail 600 is opposite to the second end 220; the sand leakage net 12 is provided on one side of the width direction of the drum 100; The roller support wheel 730 is located at the first end 210 and is rotatably engaged with the outer wall of the mating wheel 500. A roller 630 is provided at the bottom of the limiting guide rail 600, and the roller 630 is rotatably disposed in the roller track 230. The rotating shaft 410 includes a protrusion 420 , and the mating wheel 500 has a recess 520 with an opening facing downward. The protrusion 420 can be inserted into the recess 520 to rotate the rotating shaft 410 of the gear box 400 and drive the drum 100 to flip.

[0024] The drum suspension rotation transmission assembly of this solution includes a drum 100, an upper shell 200, a lower shell 300, a gear box 400, and a sand leakage net 12; the upper shell 200 is detachably arranged on the lower shell 300, and the discharge port 201 of the upper shell 200 is directly opposite to the bottom port 301 of the lower shell 300; the first end 210 of the upper shell 200 has a rotating shaft 410 of the gear box 400, and the second end 220 of the upper shell 200 has an arc-shaped roller track 230; the sand leakage net 12 is arranged on the drum 100. One side in the width direction; one end of the drum 100 has a mating wheel 500, and the other end is provided with an arc-shaped limiting guide rail 600; the mating wheel 500 and the drum support wheel 730 are rotatably abutted; the roller 630 on the limiting guide rail 600 is rotatably mounted on the roller track 230 of the upper shell 200; the protrusion 420 of the rotating shaft 410 can be inserted into the recess 520 of the mating wheel 500, so that the rotating shaft 410 of the gear box 400 rotates, thereby driving the drum 100 to flip. In other words, both ends of the drum 100 in the longitudinal direction are rotatably supported on the upper shell 200, and the gear box 400 can drive the drum 100 to flip, so that the cat litter in the drum 100 is dumped through the bottom opening 301 and the discharge port 201, thereby achieving mechanized cat litter cleaning. Such a drum suspension rotation transmission assembly has the advantages of simple structure, easy operation, and can achieve efficient and rapid cat litter cleaning.

[0025] It should be noted that the sand leakage net 12 has a plurality of mesh holes, which can allow the gravel in the cat litter to pass through, while blocking the cat feces from entering (from retaining the cat feces in the drum 100), so as to separate the cat feces from the cat litter and facilitate efficient cleaning of the cat feces through the bottom opening 301 and the discharge port 201.

[0026] Please continue reading Figures 1 to 9 , for more details on the drum suspension rotation drive assembly.

[0027] like Figure 2 、 Figure 3 and Figure 4 As shown, in an optional embodiment, the protrusion 420 has parallel side surfaces 421 and an arcuate top surface 422 connecting the two side surfaces 421; the recess 520 has two relatively parallel side walls 521, which correspond one-to-one with the side surfaces 421; the bottom of the recess 520 has an arcuate groove bottom 522; when the protrusion 420 is inserted into the recess 520, the side walls 521 abut against the corresponding side walls 521, and the arcuate top surface 422 abuts against the arcuate groove bottom 522. This ensures that the protrusion 420 and the recess 520 are tightly engaged, thereby ensuring that the rotating shaft 410 can accurately drive the drum 100 to flip.

[0028] like Figure 2 、 Figure 3 、 Figure 9As shown, in an optional embodiment, the recess 520 has a mating piece 523 disposed on the arcuate groove bottom 522. The arcuate top surface 422 of the protrusion 420 has a latching slot 423 into which the mating piece 523 can be latched. The mating piece 523 and the latching slot 423 cooperate to form a hook-type structure. This design of the latching slot 423 prevents the roller 100 from moving toward the other end during rotation after mating with the gear shaft, thereby improving the reliability of the product rotation and the friction life of the roller 630 at the other end and the roller track 230.

[0029] like Figure 2 、 Figure 4 and Figure 5 As shown, in an optional embodiment, the drum suspension rotation transmission assembly further includes a rotating support wheel 640; the rotating support wheel 640 is disposed at the second end 220 of the upper shell 200 and is located above the roller track 230; the limiting guide rail 600 is provided with a limiting track 601, which extends in an arc shape; when the roller 630 of the drum 100 falls into the roller track 230, the rotating support wheel 640 engages with the limiting track 601, and the rotating support wheel 640 and the limiting track 601 are rotatably engaged. The rotating support wheel 640 can engage with the limiting guide rail 600 at the second end 220 to prevent the drum 100 from escaping from the roller track 230, thereby ensuring the stability and reliability of the drum 100 during flipping.

[0030] like Figure 2 、 Figure 6 、 Figure 7 and Figure 8 As shown, in an optional embodiment, the limiting guide rail 600 includes an inner rail 610 and an outer rail 620; both the inner rail 610 and the outer rail 620 are arc-shaped, and the outer rail 620 is located radially outward of the inner rail 610; the roller 630 is arranged along the circumference of the outer rail 620 and is located at the bottom of the outer rail 620; the limiting guide rail 600 is provided on the outer wall of the drum 100; the inner rail 610, the outer rail 620 and the outer wall of the drum 100 enclose a limiting rail 601. Such a limiting guide rail 600 has a simple structure and is easy to assemble.

[0031] In an alternative embodiment, the outer rail 620 includes a middle portion 621 and two outer end portions 622. Along the extension direction of the outer rail 620, the two outer end portions 622 are symmetrically arranged on either side of the middle portion 621. A spacing is maintained between the middle portion 621 and each outer end portion 622 to form an installation channel 623. During assembly, the rotating support wheel 640 can pass through the installation channel 623 and enter the retaining track 601, thereby facilitating installation and removal of the drum 100.

[0032] like Figure 2As shown, in an optional embodiment, a reinforcing plate 710 is further included. The reinforcing plate 710 extends in an arc shape and is provided with a plurality of connecting posts 720 arranged along the extending direction of the reinforcing plate 710. The plurality of roller support wheels 730 are the same in number as the plurality of connecting posts 720 and correspond one to one. Each roller support wheel 730 is provided on a corresponding connecting post 720. The reinforcing plate 710 is located on the outer wall of the upper shell 200. After the connecting posts 720 pass through the upper shell 200, the roller support wheels 730 are all located in the inner cavity of the upper shell 200. The plurality of roller support wheels 730 are all in contact with the outer peripheral wall of the mating wheel 500. The reinforcing plate 710 cooperates with the roller support wheels 730 to ensure that the lower portion of the mating wheel 500 is supported by the roller support wheels 730, thereby ensuring stable rotation at the first end 210 and preventing the weight of the drum 100 from being applied to the rotating shaft 410, which is beneficial for increasing the service life of the rotating shaft 410.

[0033] In an optional embodiment, the bottom of the roller track 230 has a plurality of sand leakage holes 233 , which penetrate the inner wall of the upper shell 200 . The sand leakage holes 233 can discharge the leaked sand and gravel to the discharge port 201 .

[0034] In an optional embodiment, the inner wall of the upper shell 200 transitions to the discharge port 201 in an arc shape, thereby facilitating the dropping of cat litter.

[0035] In a second aspect, the present invention provides an open cat litter box, comprising the drum suspension rotary transmission assembly of any one of the aforementioned embodiments. Such an open cat litter box is easy to operate and has a high degree of automation.

[0036] In summary, the embodiments of the present invention provide a drum suspension rotary transmission assembly and an open cat litter box, which have at least the following advantages: The drum-suspended rotary transmission assembly of this embodiment includes a drum 100, an upper shell 200, a lower shell 300, a gearbox 400, and a sand filter 12. The drum 100 is rotatably supported on the upper shell 200 at both ends along its length, while the gearbox 400 drives the drum 100 to rotate, dumping the cat litter inside the drum 100 through the bottom opening 301 and the discharge port 201, thereby achieving mechanized cat litter cleaning. This drum-suspended rotary transmission assembly has the advantages of simple structure, easy operation, and efficient and rapid cat litter cleaning.

[0037] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A drum suspension rotation transmission assembly, characterized in that: include: Drum (100), upper shell (200), lower shell (300), gear box (400), sand leakage net (12); The upper shell (200) is detachably arranged on the lower shell (300), and the inner wall of the upper shell (200) and the inner wall of the lower shell (300) enclose a receiving space (11); the bottom of the upper shell (200) has a through discharge port (201), and the bottom of the lower shell (300) has a through bottom opening (301); the bottom opening (301) is opposite to the discharge port (201); Along the length direction of the upper shell (200), the upper shell (200) has a first end (210) and a second end (220) that are opposite to each other; The gear box (400) is located in the accommodating space (11), and the rotating shaft (410) of the gear box (400) passes through the first end (210) and extends into the inner cavity of the upper shell (200); the second end (220) of the upper shell (200) has an arc-shaped roller track (230); Along the length direction of the roller (100), one end of the roller (100) is provided with a matching wheel (500), and the other end is provided with an arc-shaped limiting guide rail (600); the matching wheel (500) is opposite to the first end (210), and the limiting guide rail (600) is opposite to the second end (220); the sand leakage net (12) is provided on one side of the width direction of the roller (100); The roller support wheel (730) is located at the first end (210), and the roller support wheel (730) is rotatably engaged with the outer wall of the mating wheel (500); a roller (630) is provided at the bottom of the limiting guide rail (600), and the roller (630) is rotatably arranged in the roller track (230); The rotating shaft (410) includes a protrusion (420), and the matching wheel (500) has a recess (520) with an opening facing downward; the protrusion (420) can be embedded in the recess (520) to rotate through the rotating shaft (410) of the gear box (400), thereby driving the roller (100) to flip.

2. The drum suspension rotation transmission assembly according to claim 1, characterized in that: The protrusion (420) has parallel side surfaces (421) and an arc-shaped top surface (422) connecting the two side surfaces (421). The recess (520) has two relatively parallel side walls (521), and the two side walls (521) are matched with the side surfaces (421) in a one-to-one correspondence; the bottom of the recess (520) has an arc-shaped groove bottom (522); When the protrusion (420) is embedded in the recess (520), the side wall (521) abuts against the corresponding side wall (521), and the arc-shaped top surface (422) abuts against the arc-shaped groove bottom (522).

3. The drum suspension rotation transmission assembly according to claim 2, characterized in that: The notch (520) has a matching piece (523), and the matching piece (523) is arranged on the arc-shaped groove bottom (522); the arc-shaped top surface (422) of the protrusion (420) has a slot (423), and the matching piece (523) can be snapped into the slot (423).

4. The drum suspension rotation transmission assembly according to claim 1, characterized in that: It also includes a rotating support wheel (640); the rotating support wheel (640) is arranged at the second end (220) of the upper shell (200), and the rotating support wheel (640) is located above the roller track (230); The limiting guide rail (600) is provided with a limiting track (601), and the limiting track (601) extends in an arc shape; When the roller (630) of the drum (100) falls into the roller track (230), the rotating support wheel (640) is embedded in the limiting track (601), and the rotating support wheel (640) and the limiting track (601) are rotatably matched.

5. The drum suspension rotation transmission assembly according to claim 1, characterized in that: The limiting guide rail (600) comprises an inner rail (610) and an outer rail (620); the inner rail (610) and the outer rail (620) are both arc-shaped, and the outer rail (620) is located outside the inner rail (610) in a radial direction; the roller (630) is arranged along the circumference of the outer rail (620), and the roller (630) is located at the bottom of the outer rail (620); The limiting guide rail (600) is arranged on the outer wall of the drum (100); the inner rail (610), the outer rail (620) and the outer wall of the drum (100) are enclosed to form a limiting track (601).

6. The drum suspension rotation transmission assembly according to claim 5, characterized in that: The outer rail (620) includes a middle portion (621) and two outer end portions (622); Along the extension direction of the outer rail (620), the two outer end portions (622) are symmetrically arranged on both sides of the middle portion (621); a spacing is maintained between the middle portion (621) and each of the outer end portions (622) to form a mounting channel (623).

7. The drum suspension rotation transmission assembly according to claim 1, characterized in that: It also includes a reinforcing plate (710); the reinforcing plate (710) extends in an arc shape, and a plurality of connecting columns (720) are provided on the reinforcing plate (710), and the plurality of connecting columns (720) are arranged along the extending direction of the reinforcing plate (710); The number of the plurality of roller support wheels (730) is the same as the number of the plurality of connecting columns (720), and they correspond one to one; each of the roller support wheels (730) is arranged on a corresponding connecting column (720); The reinforcing plate (710) is located on the outer wall of the upper shell (200); after the connecting column (720) passes through the upper shell (200), the roller supporting wheels (730) are all located in the inner cavity of the upper shell (200); The plurality of roller support wheels (730) are all in contact with the outer peripheral wall of the matching wheel (500).

8. The drum suspension rotation transmission assembly according to claim 1, characterized in that: The bottom of the roller track (230) has a plurality of sand leakage holes (233), and the sand leakage holes (233) penetrate through the inner wall of the upper shell (200).

9. The drum suspension rotation transmission assembly according to claim 1, characterized in that: The inner wall of the upper shell (200) transitions in an arc shape toward the discharge outlet (201).

10. An open cat litter box, characterized in that: The open cat litter box includes the drum suspension rotation transmission assembly according to any one of claims 1-9.

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