Automatic litter refill mechanism

Abstract

This disclosure relates to the technical field of pet supplies and includes a cat litter automatic replenishment structure, which includes a sand storage box (100) and a sand replenishment device (200). The sand storage box (100) is provided with a sand storage material discharge port (10). The sand replenishment device (200) includes a device body (21), a material feed screw rod (22) and a driver (23). The device body (21) is provided with a screw rod cavity, and a sand replenishment material supply port (210) and a sand replenishment material discharge port (211) that communicate with the screw rod cavity. The sand storage box material discharge port (10) is connected to and communicates with the sand replenishment material supply port (210). The material feed screw rod (22) is attached to the screw rod cavity, and the driver is connected to the material feed screw rod (22) to rotate the material feed screw rod (22). The rotation of the material feed screw rod (22) pushes the cat litter to achieve quantitative litter replenishment, and the litter replenishment is smooth and does not get stuck or clogged. This design can achieve quantitative litter replenishment and is more convenient to use.

Description

[Technical Field]

[0001] This application claims priority from a Chinese patent application filed with the China Patent Office on March 13, 2023, bearing application number 202320534612.3 and entitled "Automatic cat litter refilling structure," the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the technical field of pet supplies, and more particularly to an automatic cat litter refilling structure. [Background technology]

[0003] In recent years, the pet market has grown rapidly as more and more people have started keeping pets. Pets provide peace of mind and relieve anxiety and loneliness, and cats are one of the pets that many people keep.

[0004] Cats basically use cat litter to excrete, and as they use it, more and more cat litter is consumed. If there is too little cat litter, the excrement will stick to the bottom of the container, making the cat litter box dirtier or causing odors to be hidden. Furthermore, cat litter deteriorates after long-term use, so new cat litter needs to be frequently replenished. However, currently, litter is generally replenished manually, and it cannot be replenished automatically and immediately. Summary of the Invention [Problem to be solved by the invention]

[0005] In view of this, the present application aims to provide an automatic cat litter refilling structure that can achieve quantitative cat litter refilling and is more convenient to use. [Means for solving the problem]

[0006] In order to achieve the above technical objectives, the present application provides an automatic cat litter refilling structure, which includes a litter storage box and a litter refilling device: The sand storage box is provided with a sand box material discharge port; The sand supplying device includes a device body, a material feeding screw rod and a driver; The device body is provided with a screw rod cavity, and a sand replenishment material supply port and a sand replenishment material discharge port that communicate with the screw rod cavity, The sand box material discharge port is connected to the sand replenishing material supply port for electrical conduction; the material feed screw rod is mounted in the screw rod cavity; The driver is connected to the material feed screw rod and rotates the material feed screw rod.

[0007] Furthermore, the sand replenishing device further includes a sand discharge joint and an elastic member; the sand discharge joint is attached to the sand replenishment material discharge port by the elastic member so as to be elastically stretchable and contractible along the material discharge direction of the sand replenishment material discharge port; a wedge portion is provided on the outer peripheral wall of the sand discharge joint at one end away from the sand replenishment material discharge port; a surface of the wedge portion remote from the sand replenishment material discharge port and an end surface of the sand discharge joint remote from the sand replenishment material discharge port are aligned with each other; a thickness of the wedge portion gradually decreases along one end of the wedge portion connected to the sand discharge joint toward the other end remote from the sand discharge joint; The sand discharge cavity of the sand discharge joint is provided with a material guide slope for the sand discharged from the sand replenishment material discharge port to slide down.

[0008] Furthermore, the sand replenishing device The sand supplying device further includes a sand discharge joint attached to the sand supplying material discharge port and elastically deformable by itself.

[0009] Furthermore, the sand replenishment material supply port is provided on the outer peripheral wall of the device body and is arranged to face upward, The sand storage box is attached to the sand replenishment material supply port, The sand box material discharge port is provided at the bottom of the sand storage box; the sand storage box includes an upper box segment and a lower box segment connected to the upper box segment; The box cavity of the lower box segment narrows gradually from top to bottom.

[0010] Furthermore, the automatic cat litter refilling structure is further provided with a detection device for detecting the remaining amount of litter.

[0011] Furthermore, the screw flights on the material feeding screw rods are either equidistant screw flights or variable distance screw flights.

[0012] Furthermore, the screw flights on the material feeding screw rods are either constant radius screw flights or variable radius screw flights.

[0013] Furthermore, the sand replenishment material discharge port is provided on one end surface of the device body, and the upper half thereof is closed; the screw rod cavity is composed of an input cavity segment and an output cavity segment; the input cavity segment communicates directly with the sand replenishment material inlet; the output cavity segment is in direct communication with the sand replenishment material outlet; The screw flight distance of the material feed screw rod located on the screw rod segment of the output cavity segment is greater than the screw flight distance of the material feed screw rod located on the screw rod segment of the input cavity segment.

[0014] Furthermore, a material stop plate is provided between the input cavity segment and the output cavity segment and positioned above the material feed screw rod.

[0015] Furthermore, a closing seat matching the sand replenishment material discharge port is connected to one end of the screw flight of the material feed screw rod, the closing seat being close to the sand replenishment material discharge port; The closing seat engages the sand replenishment material outlet to close the sand replenishment material outlet.

[0016] Furthermore, one end of the material feeding screw rod extends from the device body and is connected to the driver, or One end of the material feeding screw rod extends from the device body and is connected to the driver by a transmission unit. [Effects of the Invention]

[0017] As can be seen from the above technical solution, the automatic cat litter replenishment structure of the present application comprises a sand storage box for storing sand and a sand replenishment device for transporting sand, the sand replenishment device comprising a device body provided with a screw rod cavity, a material feed screw rod attached to the screw rod cavity, and a driver for rotating the material feed screw rod, the rotation of the material feed screw rod pushes the cat litter to achieve quantitative litter replenishment, the litter replenishment is smooth and does not get stuck or clogged, this design can achieve quantitative cat litter replenishment and is more convenient to use. [Brief explanation of the drawings]

[0018] In order to more clearly explain the technical solutions of the embodiments of the present application or the prior art, the following briefly introduces the drawings necessary for the description of the embodiments or the prior art. The drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without exerting any effort that amounts to an inventive step.

[0019] [Figure 1] FIG. 2 is a front view of the automatic cat litter refilling structure provided by the present application when no driver is provided. [Figure 2] FIG. 2 is a top view of the automatic cat litter refilling structure provided by the present application when no driver is provided. [Figure 3] FIG. 2 is a front cross-sectional view of the automatic cat litter refilling structure provided by the present application when no driver is provided. [Figure 4]FIG. 1 is a sectional side view of the automatic cat litter refilling structure provided by the present application when no driver is provided. [Figure 5] 1 is a three-dimensional view of a cat litter automatic refilling structure provided by the present application, in which a litter discharge joint is provided in the litter refilling device. [Figure 6] FIG. 1 is a front view of a cat litter automatic refilling structure provided by the present application, in which a litter discharge joint is provided on the litter refilling device. [Figure 7] FIG. 1 is a side view of a combination of an automatic cat litter refilling structure and a rotating cat litter box provided by the present application. [Figure 8] FIG. 1 is a front view of a combination of an automatic cat litter refilling structure and a rotating cat litter box provided by the present application. [Figure 9] 1 is a structural schematic diagram of the cat litter automatic replenishment structure provided by the present application in which the litter discharge joint is in an extended state. [Figure 10] 1 is a structural schematic diagram of the cat litter automatic replenishment structure provided by the present application, in which the litter discharge joint is in a retracted state; [Figure 11] FIG. 1 is a front view of an automatic cat litter replenishment structure provided by the present application having a material feed screw rod with a variable distance screw flight. [Figure 12] FIG. 1 is a three-dimensional view of the cat litter automatic replenishment structure provided by the present application, which has a material feeding screw rod with a variable-distance screw flight. [Figure 13] FIG. 1 is a front perspective view of an application state of an automatic cat litter replenishment structure provided by the present application having a material feed screw rod with a variable radius screw flight. [Figure 14] FIG. 1 is a side perspective view of an application state of an automatic cat litter replenishment structure provided by the present application having a material feed screw rod with a variable radius screw flight. [Figure 15] FIG. 1 is a three-dimensional view of the cat litter automatic replenishment structure provided by the present application, which has a material feeding screw rod with a variable radius screw flight. DETAILED DESCRIPTION OF THE INVENTION

[0020] The following clearly and completely describes the technical solutions of the embodiments of the present application with the aid of the drawings, and the described embodiments are not all of the embodiments but only some of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without any inventive effort fall within the scope of protection of the embodiments of the present application.

[0021] In describing the embodiments of the present application, orientations or positional relationships indicated by terms such as "center," "top," "bottom," "left," "right," "vertical," "horizontal," "inside," and "outside" are orientations or positional relationships according to the drawings, and do not indicate or imply that the indicated devices or elements must have a particular orientation, be constructed and operated in a particular orientation, but are merely intended to conveniently describe and simplify the description of the embodiments of the present application, and do not limit the embodiments of the present application. Furthermore, the terms "first," "second," and "third" do not indicate or imply relative importance, but are merely for descriptive purposes.

[0022] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, the terms "attached," "coupled," "connected," etc. should be understood in a broad sense, and may mean, for example, a fixed connection, an exchangeable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, a connection via an intermediate medium, or even internal communication between two elements. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application according to specific circumstances.

[0023] The embodiments of the present application disclose an automatic cat litter replenishment structure.

[0024] 1 to 4, one embodiment of an automatic cat litter refilling structure provided by an embodiment of the present application includes a litter storage box 100 and a litter refilling device 200.

[0025] The sand storage box 100 is provided with a sand storage material discharge port 10, and the sand storage box 100 is further provided with a sand storage material supply port for supplementing sand into the sand storage box 100.

[0026] The sand replenishing device 200 includes a device body 21, a material feeding screw rod 22, and a driver 23.

[0027] The device body 21 is provided with a screw rod cavity, and a sand replenishment material supply port 210 and a sand replenishment material discharge port 211 that communicate with the screw rod cavity. The structure of the device body 21 can be modified and designed according to the needs of installation and placement, as long as it is ensured that a screw rod cavity for transporting sand is formed inside, and is not limited here.

[0028] The sand box material outlet 10 is connected to and communicates with the sand replenishing material supply port 210, so that the sand in the sand storage box 100 can enter the screw rod cavity and be transported.

[0029] The material feed screw rod 22 is mounted in the screw rod cavity, and the driver 23 is connected to the material feed screw rod 22 to rotate the material feed screw rod 22 and realize the pushing of the sand.

[0030] In this application, the rotation of the material feed screw rod 22 pushes the cat litter to achieve quantitative litter replenishment, and the litter replenishment is smooth and does not get stuck or clogged. This design can achieve quantitative litter replenishment and is more convenient to use.

[0031] The above is Example 1 of the automatic cat litter replenishment structure provided by the embodiments of the present application, and the following is Example 2 of the automatic cat litter replenishment structure provided by the embodiments of the present application, specifically, please refer to Figures 1 to 15.

[0032] Building on the solution in Example 1 above: As shown in Figures 5 to 8, some smart cat litter boxes 300 are designed to rotate, move, etc., so in order to better combine with these cat litter boxes 300 without affecting the rotation or movement of the cat litter box 300, the litter refilling device 200 of the present application is designed to further include a litter discharge joint 31 and an elastic member (not shown).

[0033] The sand discharge joint 31 is attached to the sand replenishment material discharge outlet 211 by an elastic member so as to be elastically stretchable and contractible in the material discharge direction of the sand replenishment material discharge outlet 211. A wedge portion is provided on the outer peripheral wall of the sand discharge joint 31 at one end remote from the sand replenishment material discharge outlet 211, and one face of the wedge portion remote from the sand replenishment material discharge outlet 211 matches the end face of the sand discharge joint 31 remote from the sand replenishment material discharge outlet 211, and the thickness of the wedge portion itself gradually decreases along the one end connected to the sand discharge joint 31 towards the other end remote from the sand discharge joint 31. The wedge portion is positioned so that when the cat litter box 300 rotates or moves, it comes into contact with it and displaces relatively, and the litter discharge joint 31 is retracted, unaffected by the rotation or movement of the cat litter box 300. When the cat litter box 300 rotates or moves to the position where the litter joint 31 and the tray material supply port 301 of the cat litter box 300 are located, the elastic member causes the litter joint 31 to engage with the tray material supply port 301. At this time, when the driver 23 is activated, litter is replenished into the cat litter box 300, and when the cat litter box 300 rotates or moves, it comes into contact with the wedge portion and the litter joint 31 is retracted again. This design enables automatic alignment, is not affected by the rotation or movement of the smart cat litter box 300, achieves unhindered litter replenishment, and has better applicability. In the present application, there may be two wedge portions, and if the cat litter box 300 has a rotating design, the two wedge portions are distributed on both sides of the end of the litter box joint 31 along the rotation trajectory of the tray material supply port 301 of the cat litter box 300, so that the litter box joint 31 can be retracted whether the cat litter box 300 rotates forward or backward. The outer circumferential wall of the litter box joint 31 is further provided with a stop flange 311 that abuts against the edge of the tray material supply port 301, thereby improving the cooperation between the litter box joint 31 and the tray material supply port 301, and the wedge portion is provided to correspond to the connection point between the stop flange 311 and the outer circumferential wall of the litter box joint 31.

[0034] 9 and 10, the elastic member may be a spring, and the elastic connection form is such that the sand discharge joint 31 is provided with a protrusion 313, the device body 21 is provided with a recess 214 into which the protrusion 313 is movably inserted, the elastic member is fitted onto the protrusion 313, one end of the elastic member abuts against the sand discharge joint 31, and the other end abuts against the bottom of the recess 214. The sand discharge joint 31 is movably fitted into one end of the device body 21 where the sand replenishing material discharge port 211 is provided, and is provided with a position limiting groove 312. The device body 21 is provided with a buckle part 32213 that engages with the position limiting groove 312 and slides along the position limiting groove 312, and the sand discharge joint 31 can be mounted on the device body 21 in an expandable and contractible manner by the engagement of the buckle part 32213 with the position limiting groove 312.

[0035] As shown in Figures 9 and 10, in order to smoothly discharge sand from the sand discharge joint 31, the sand discharge cavity of the sand discharge joint 31 is provided with a material guide slope 310 for the sand discharged from the sand replenishment material discharge port 211 to slide down. As a result, the sand discharged from the sand replenishment material discharge port 211 slides along the material guide slope 310 into the cat litter box 300, and when the sand in the screw rod cavity is transferred, the sand in the sand storage box 100 naturally slides down and is replenished, thereby realizing continuous automatic sand replenishment.

[0036] Furthermore, the elastic member may not be provided, and specifically, the litter box further includes a sand discharge joint 31 that is attached to the litter refill material discharge port 211 and is itself elastically deformable. That is, the sand discharge joint 31 itself is flexible and has elastic deformation properties, and is made of a material such as rubber or silicone. In the same way, it can function as a connection with the cat litter box 300 without affecting the rotation or movement of the cat litter box 300.

[0037] 3 and 4, the sand supply port 210 is located on the outer wall of the device body 21 and faces upward. Correspondingly, the sand storage box 100 is directly attached to the sand supply port 210, and the sand discharge port 10 is located at the bottom of the sand storage box 100. This design reduces the number of connecting pipes, making the overall structure more compact. It also eliminates the need for a device to assist material discharging; the sand in the sand storage box 100 can be discharged by gravity. The sand slides down through the lower box segment 12 into the screw rod cavity, and the driver 23 rotates the material feed screw rod 22 to push the sand into the sand supply port 211. The sand then slides down into the cat litter box 300 via the material guide slope 310 of the sand discharge joint 31.

[0038] The sand storage box 100 is designed with a funnel structure and includes an upper box segment 11 and a lower box segment 12 connected to the upper box segment 11. The box cavity of the lower box segment 12 gradually narrows from top to bottom, allowing sand to slide more smoothly into the screw rod cavity. Designing the sand storage box 100 with an upper and lower segment, with only the lower segment narrowed, ensures smooth material dropping and avoids excessive reduction in the storage capacity of the sand storage box 100. Of course, the entire box cavity of the sand storage box 100 may be designed to gradually narrow from top to bottom, and this is not a limitation. Regarding the design of the box cavity of the lower box segment 12, at least one inner wall of the box cavity may be designed to have an inclination angle or curvature, and the box cavity may be designed to gradually narrow, and this is not a limitation.

[0039] Furthermore, in this application, the automatic cat litter refilling structure is further provided with a detection device (not shown) for detecting the remaining amount of litter. Specifically, a detection device for detecting the remaining amount of litter is provided at the bottom of the sand storage box 100. The detection device may be an infrared sensor, a laser sensor, an electrode plate sensor, a pressure sensor, a mechanical switch, a current detector, etc., but is not limited thereto. This design can check the amount of litter stored in the sand storage box 100, and when the control system determines that the amount of litter is insufficient based on the data detected by the detection sensor, it will send an alarm signal and promptly replenish the litter.

[0040] Furthermore, the screw flights on the material feeding screw rod 22 may be designed as equal distance screw flights or variable distance screw flights, which can be specifically changed and designed according to actual needs, and are not limited here.

[0041] Furthermore, the screw flights on the material feed screw rod 22 may be designed as constant radius screw flights or variable radius screw flights, and can be specifically changed and designed according to actual needs, and are not limited here. For the application of variable radius screw flights to the material feed screw rod 22, please refer to Figures 13 to 15, and no further details will be given here.

[0042] Furthermore, as shown in Figures 9 and 10, the sand replenishment material discharge port 211 is provided on one end face of the device body 21, and its upper half is designed to be closed, for example. That is, when the sand replenishment material discharge port 211 is designed so that the lower half is open, the screw flight on the material feed screw rod 22 is designed as a variable distance screw flight.

[0043] Specifically, the screw rod cavity is designed to consist of an input cavity segment and an output cavity segment, the input cavity segment directly communicates with the sand replenishment material supply port 210, and the output cavity segment directly communicates with the sand replenishment material discharge port 211. Here, the sand replenishment material supply port 210 is opened at a position corresponding to the input cavity segment, and the sand replenishment material discharge port 211 is opened at a position corresponding to the output cavity segment.

[0044] 10 to 12, the screw flight distance of the material feed screw rod 22 located on the screw rod segment of the output cavity segment is designed to be greater than the screw flight distance of the screw rod segment of the input cavity segment, and specifically, may be at least twice the screw flight distance of the screw rod segment of the input cavity segment. Because the screw flight distance of the output cavity segment is at least twice that of the input cavity segment, when the cat litter reaches the output cavity segment, the cross-sectional area is less than half that of the input cavity segment. At this time, the litter corresponds to the opening at the lower end of the litter replenishment material discharge port 211, and is smoothly transferred to the litter replenishment material discharge port 211 without getting stuck, ensuring smooth discharge of the material.

[0045] 9 and 10, a material stopper plate 212 is provided between the input cavity segment and the output cavity segment and located above the material feed screw rod 22. The material stopper plate 212 acts as a shield against sand that falls into the input cavity segment, restricting the amount of cat litter that falls from the sand storage box 100 and preventing the sand that falls into the input cavity segment from entering the output cavity segment, thereby achieving accurate control of sand transfer.

[0046] 9 to 12, a closing sheet 221 that matches the sand replenishment material discharge port 211 is connected to one end of the screw flight on the material feed screw rod 22 that is close to the sand replenishment material discharge port 211, and the closing sheet 221 engages with the sand replenishment material discharge port 211 to close the sand replenishment material discharge port 211. After sand replenishment is completed, the material feed screw rod 22 is driven so that the closing sheet 221 reaches the position of the sand replenishment material discharge port 211, thereby sealing the sand replenishment material discharge port 211 and preventing further outflow of sand.

[0047] In this application, when the material feed screw rod 22 transfers sand, the volume of sand transferred is constant, and the sand replenishment amount is controlled by controlling the rotation speed of the material feed screw rod 22.

[0048] Furthermore, one end of the material feed screw rod 22 extends from the device body 21 and is coaxially connected to the driver 23, that is, the driver 23 is directly connected to the material feed screw rod 22 by a shaft coupling to rotate the material feed screw rod 22.

[0049] 9, one end of the material feeding screw rod 22 may extend from the device body 21 and be connected to the driver 23 by a transmission unit 24, which may be a gear transmission unit. In this way, the driver 23 is provided below or on the side of the device body 21, thereby saving space and making the overall structure more compact.

[0050] In this application, the driver 23 may be a normal servo motor, and is not limited thereto.

[0051] The above is a detailed introduction to the automatic cat litter refilling structure provided by the present application. Those skilled in the art may make changes to the specific embodiments and their scope of application based on the concepts of the examples of the present application. As such, the contents of this specification do not limit the present application. [Explanation of symbols]

[0052] 100...Sand storage box; 200...Sand replenishment device; 300 ···Cat litter box; 301 ···Tray material supply port; 10...Sandbox material outlet; 11 ··· upper box segment; 12···lower box segment; 21 ···Device body; 210...Material supply port for sand replenishment; 211...Material outlet for sand replenishment; 212 ···Material stop plate; 213 ···Buckle section; 214...concave hole; 22 ···Material feed screw rod; 221 ···Closure sheet; 23 ···driver; 24 ···Transmission unit; 31 ···Sand discharge joint; 310 ···Material guide slope; 311 ···Stop flange; 312 ···Position limiting groove; 313...protrusion; 32 Buckle part.

Claims

1. An automatic cat litter refilling structure, comprising a litter storage box (100) and a litter refilling device (200), The sand storage box (100) is provided with a sand box material discharge port (10), The sand replenishing device (200) includes a device body (21), a material feeding screw rod (22) and a driver (23); The device body (21) is provided with a screw rod cavity, and a sand replenishment material supply port (210) and a sand replenishment material discharge port (211) that communicate with the screw rod cavity, The sand box material outlet (10) is connected to the sand replenishing material supply port (210) and is electrically connected thereto; The material feed screw rod (22) is mounted in the screw rod cavity; The automatic cat litter replenishment structure is characterized in that the driver (23) is connected to the material feed screw rod (22) and rotates the material feed screw rod (22).

2. The sand replenishing device (200) further includes a sand discharge joint (31) and an elastic member; The sand discharge joint (31) is attached to the sand replenishment material discharge port (211) in an elastically expandable and contractible manner along the material discharge direction of the sand replenishment material discharge port (211) by the elastic member, A wedge portion is provided on the outer peripheral wall of the sand discharge joint (31) at one end away from the sand replenishment material discharge port (211), The surface of the wedge portion away from the sand replenishment material outlet (211) is aligned with the end surface of the sand discharge joint (31) away from the sand replenishment material outlet (211); the thickness of the wedge portion gradually decreases along one end of the wedge portion connected to the sand discharge joint (31) in the direction of the other end remote from the sand discharge joint (31); The automatic cat litter replenishment structure according to claim 1, characterized in that the sand discharge cavity of the sand discharge joint (31) is provided with a material guide slope (310) for sliding down the sand discharged from the sand replenishment material discharge port (211).

3. The sand replenishing device (200) 2. The automatic cat litter refilling structure according to claim 1, further comprising a sand discharge joint (31) attached to the litter refilling material discharge port (211) and elastically deformable.

4. The sand replenishment material supply port (210) is provided on the outer peripheral wall of the device body (21) and is arranged to face upward. The sand storage box (100) is attached to the sand replenishing material supply port (210), The sand box material outlet (10) is provided at the bottom of the sand storage box (100); The sand storage box (100) includes an upper box segment (11) and a lower box segment (12) connected to the upper box segment (11); 2. The automatic cat litter refilling structure according to claim 1, wherein the box cavity of the lower box segment (12) is gradually narrowed from top to bottom.

5. The automatic cat litter refilling structure according to claim 1, further comprising a detector for detecting the remaining amount of litter.

6. 2. The cat litter automatic replenishment structure according to claim 1, wherein the screw flights on the material feeding screw rod (22) are equal distance screw flights or variable distance screw flights.

7. 2. The automatic cat litter replenishing structure according to claim 1, wherein the screw flights on the material feeding screw rod (22) are constant radius screw flights or variable radius screw flights.

8. The sand supply material outlet (211) is provided on one end surface of the device body (21), and the upper half thereof is closed; the screw rod cavity is composed of an input cavity segment and an output cavity segment; The input cavity segment is in direct communication with the sand replenishment material supply port (210); The output cavity segment is directly connected to the sand replenishment material outlet (211); The automatic cat litter replenishment structure according to claim 6, characterized in that the screw flight distance of the material feed screw rod (22) located on the screw rod segment of the output cavity segment is greater than the screw flight distance of the screw rod segment of the input cavity segment.

9. The automatic cat litter replenishment structure according to claim 8, characterized in that a material stop plate (212) is provided between the input cavity segment and the output cavity segment and positioned above the material feed screw rod (22).

10. A closing seat (221) matching the sand replenishment material discharge port (211) is connected to one end of the screw flight of the material feed screw rod (22) that is close to the sand replenishment material discharge port (211); The automatic cat litter refilling structure according to claim 8, wherein the closing sheet (221) engages with the litter refilling material discharge port (211) to close the litter refilling material discharge port (211).

11. One end of the material feeding screw rod (22) extends from the device body (21) and is connected to the driver (23), or 2. The automatic cat litter refilling structure according to claim 1, wherein one end of the material feeding screw rod (22) extends from the device body (21) and is connected to the driver (23) by a transmission unit (24).

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