Sweeping robot

Abstract

The application relates to the technical field of cleaning machines, and provides a sweeping robot, wherein when a roller makes a piston structure generate net negative pressure in a rotating process, a first one-way valve is opened, a second one-way valve is closed, and external air enters the piston structure through a first connecting pipe; when the roller makes the piston structure generate high pressure in the rotating process, the first one-way valve is closed, the second one-way valve is opened, high-pressure air in the piston structure enters a water tank, the air pressure in the water tank is increased, and water in the water tank is discharged from a water outlet under the action of the air pressure, so that the sweeping robot can automatically discharge water when working, and stop discharging water when stopping, without an external power source, so that the functions of automatic water discharge and water stop are realized at a lower cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cleaning machines, in particular to a sweeping machine. BACKGROUND

[0002] With the development of economy and the progress of society, people's demand for the quality of life is getting higher and higher, so some intelligent appliances that can liberate labor have emerged. Among them, the sweeping robot as a kind of intelligent appliance, due to its efficient and intelligent cleaning effect, has rapidly popularized in people's life.

[0003] In the related art, the sweeping robot is provided with a water tank, and the water in the water tank is used to wet the ground to improve the cleaning effect. The existing water tank of the sweeping robot mainly controls the water outlet of the water tank through a water pump, an air pump or a battery valve, etc. The above-mentioned method needs to purchase a power device, which leads to high cost. In addition, some sweeping robots do not rely on external power source, and the water tank automatically seeps water. This method cannot control the automatic water outlet of the water tank, and the water outlet will stop only when the water in the water tank is used up, which may cause the problem of excessive water outlet and a large amount of water remaining on the ground during use. SUMMARY

[0004] The main purpose of the present application is to provide a sweeping robot, which aims to solve the technical problem of automatic water outlet and water stop of the water tank without relying on external power source in the prior art.

[0005] The present application proposes the following technical solutions:

[0006] A sweeping robot comprises a water tank, a first connecting pipe, a second connecting pipe, a roller and a piston structure. The bottom of the water tank is provided with a water outlet hole. The first connecting pipe is provided with a first one-way valve. The second connecting pipe is provided with a second one-way valve. One end of the first connecting pipe is in communication with the outside, and the other end is in communication with the piston structure. One end of the second connecting pipe is in communication with the water tank, and the other end is in communication with the piston structure. The roller makes the piston structure generate net negative pressure or high pressure during rotation.

[0007] During sweeping, when the roller makes the piston structure generate net negative pressure during rotation, the first one-way valve is opened, and the second one-way valve is closed. The air from the outside enters the piston structure through the first connecting pipe. When the roller makes the piston structure generate high pressure during rotation, the first one-way valve is closed, and the second one-way valve is opened. The high-pressure air in the piston structure enters the water tank, so that the air pressure in the water tank increases, and the water in the water tank is discharged from the water outlet hole under the action of air pressure.

[0008] Further, the piston structure comprises a piston barrel and a piston rod, the roller drives the piston rod to slide in the piston barrel during rotation, so that the piston barrel generates net negative pressure or high pressure.

[0009] Further, the piston structure further comprises an elastic member arranged in the piston barrel, an eccentric part is formed on the roller, one end of the piston rod extending out of the piston barrel abuts against the eccentric part, and one end of the piston rod located in the piston barrel abuts against the elastic member, the roller drives the eccentric part to rotate during rotation, the eccentric part drives the piston rod to push from the maximum retreat state to the maximum advance state in the piston barrel during rotation of the roller, so that the piston barrel generates high pressure; the elastic member drives the piston rod to push from the maximum advance state to the maximum retreat state in the piston barrel during rotation of the roller, so that the piston barrel generates net negative pressure.

[0010] Further, an end cover is arranged at an end of the piston barrel, and the end cover is used to prevent the piston rod from falling off during sliding.

[0011] Further, the robot further comprises a third connecting pipe, one end of the third connecting pipe is in communication with the piston structure, and the other end of the third connecting pipe is provided with a deflation device, and the deflation device is used to control whether the piston structure can generate net negative pressure or high pressure during rotation of the roller.

[0012] Further, the deflation device comprises a fixed seat, a movable seat, and a deflation valve, the movable seat is movably arranged on the fixed seat, and the deflation valve is fixedly arranged on the movable seat, the deflation valve opens or closes one end of the third connecting pipe by moving the movable seat, so as to control whether the piston structure can generate net negative pressure or high pressure during rotation of the roller.

[0013] Further, a through hole is formed in the fixed seat, and a buckle is formed on the movable seat, the buckle moves in the through hole when the buckle is inserted into the through hole.

[0014] Further, a containing cavity is formed at the bottom of the water tank, and the first connecting pipe, the second connecting pipe, the roller, and the piston structure are arranged in the containing cavity.

[0015] Further, a fixed cover is arranged on an opening cover of the containing cavity, and an opening is formed in the fixed cover and used for the roller to pass through.

[0016] Further, the water tank is provided with a fourth connecting pipe, the fourth connecting pipe comprises a first end and a second end in communication with the water tank, the communication position of the first end with the water tank corresponds to the communication position of the second connecting pipe with the water tank, and the opening of the second end faces downward to prevent water in the water tank from entering the second one-way valve.

[0017] The sweeping robot provided by the application can realize automatic water discharge when working and stop water discharge when stopping, and does not need an external power source, so that the functions of automatic water discharge and water stop are realized at a lower cost. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the sweeping robot of the application;

[0019] Figure 2 It is a schematic diagram of the overall structure of the sweeping robot of the application (excluding the fixed cover);

[0020] Figure 3 It is a schematic diagram of the internal structure of the sweeping robot of the application;

[0021] Figure 4 It is a sectional view of the sweeping robot of the application;

[0022] Figure 5 It is a schematic diagram of the structure of the moving frame and the air release valve;

[0023] Figure 6 It is a schematic diagram of the internal structure of the water tank of the application;

[0024] Figure 7 It is a schematic diagram of the overall structure of the mopping robot of the application;

[0025] Figure 8 It is a schematic diagram of the overall structure of the mopping robot of the application (excluding the first and second rolling brushes);

[0026] Figure 9 It is a schematic diagram of the structure of the mopping robot of the application from another angle.

[0027] The names of the parts marked in the figure are as follows: 1, first connecting pipe; 11, first one-way valve; 2, second connecting pipe; 21, second one-way valve; 3, water tank; 30, water outlet hole; 31, containing cavity; 32, fixed cover; 4, roller; 5, piston structure; 51, piston cylinder; 52, piston rod; 53, elastic member; 54, eccentric part; 55, end cover; 6, third connecting pipe; 7, air release device; 71, fixed seat; 711, penetrating hole; 72, moving seat; 721, buckle; 73, air release valve; 8, fourth connecting pipe; 81, first end; 82, second end; 100, body; 101, first rolling brush; 102, second rolling brush; 103, wiping structure; 1031, first scraping plate; 1032, second scraping plate; 104, cleaning water port; 105, water suction port; 106, sewage tank.

[0028] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0029] It should be understood that the specific embodiments described herein merely exemplify the application and do not limit the application.

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0031] In the description of the present application, it should be noted that unless otherwise specifically specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication between two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In the present application, unless otherwise explicitly specified and limited, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. "Under", "below" and "underneath" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0033] Referring to Figures 1 to 3 A sweeping robot comprises a water tank 3, a first connecting pipe 1, a second connecting pipe 2, a roller 4 and a piston structure 5, the bottom of the water tank 3 is provided with a water outlet hole 30, the first connecting pipe 1 is provided with a first one-way valve 11, the second connecting pipe 2 is provided with a second one-way valve 21, one end of the first connecting pipe 1 is in communication with the outside, and the other end is in communication with the piston structure 5, one end of the second connecting pipe 2 is in communication with the water tank 3, and the other end is in communication with the piston structure 5, the roller 4 makes the piston structure 5 generate net negative pressure or high pressure during rotation; during sweeping, when the roller 4 makes the piston structure 5 generate net negative pressure during rotation, the first one-way valve 11 is opened, the second one-way valve 21 is closed, and the air from the outside enters the piston structure 5 through the first connecting pipe 1; when the roller 4 makes the piston structure 5 generate high pressure during rotation, the first one-way valve 11 is closed, the second one-way valve 21 is opened, and the high-pressure air in the piston structure 5 enters the water tank 3, so that the air pressure in the water tank 3 increases, and the water in the water tank 3 is discharged from the water outlet hole 30 under the action of the air pressure. Specifically, the piston structure 5 is fixed on the bottom of the water tank 3 by screws, the wheel is fixed to the bottom of the water tank 3 by a rotating shaft, the first connecting pipe 1 and the second connecting pipe 2 are arranged on the bottom of the water tank 3 by a fixing cover 32, the fixing cover 32 is clamped and fixed by screws, and the roller 4 is driven by a driving motor arranged on the sweeping robot. During sweeping, the air flow directions in the first connecting pipe 1 and the second connecting pipe 2 are unidirectional flow. The present application can realize automatic water discharge of the sweeping robot during work and stop water discharge when the machine stops by the way of the roller 4 driving the piston structure 5 to pressurize the water tank 3, without external power source for providing pressure to the water tank 3, realizing the functions of automatic water discharge and water stop, and the water discharge speed can be adaptively adjusted according to the movement speed of the sweeping robot, so that the water discharge of the sweeping robot to each cleaned area during sweeping is uniform.

[0034] Referring to Figure 4In one possible embodiment, the piston structure 5 comprises a piston cylinder 51 and a piston rod 52, and the roller 4 drives the piston rod 52 to slide in the piston cylinder 51 during rotation, so as to generate a net negative pressure or high pressure in the piston cylinder 51. For example, the roller 4 is provided with a cam, and a circular ring is sleeved on the cam, and the outer periphery of the circular ring is movably connected with the piston rod 52. When the roller 4 rotates, the cam is driven to rotate, and the cam moves relative to the circular ring in the circular ring. When the protruding direction of the protruding part of the cam is opposite to the piston rod 52, the piston rod 52 is pushed into the piston cylinder 51, and when the protruding direction of the protruding part of the cam is away from the piston rod 52, the piston rod 52 is pulled out of the piston cylinder 51. With the rotation of the roller 4, the piston rod 52 reciprocates in the piston cylinder 51, thereby achieving the effect of pressurizing the water tank 3. In addition, a connecting rod crank connecting rod mechanism can also be applied to the piston structure 5 of the present application. The above is only an example of the piston structure 5 which can pressurize the water tank 3 under the drive of the roller 4, and other embodiments achieving the same function should be within the protection scope of the present application.

[0035] With reference to Figure 4In a preferred embodiment, the piston structure 5 further comprises a resilient member 53 arranged in the piston barrel 51, the roller 4 is provided with an eccentric part 54, the piston rod 52 is in abutment with the eccentric part 54 at one end extending out of the piston barrel 51, and the piston rod 52 is in abutment with the resilient member 53 at one end located in the piston barrel 51. During rotation of the roller 4, the eccentric part 54 is driven to rotate, and the piston rod 52 is pushed from the maximum retracted state to the maximum advanced state in the piston barrel 51, so that high pressure is generated in the piston barrel 51. During rotation of the roller 4, the resilient member 53 drives the piston rod 52 to be pushed from the maximum advanced state to the maximum retracted state in the piston barrel 51, so that net negative pressure is generated in the piston barrel 51. Specifically, in this embodiment, the eccentric part 54 is a disc, the resilient member 53 is a spring, the middle part of the roller 4 is recessed inward to form a groove, and the disc is arranged in the groove, wherein the central axis of the disc is not in the same straight line as the central axis of the roller 4. When the roller 4 drives the disc to rotate, the distance between the central axis of the disc and the piston rod 52 is the closest, at this time the state of the piston rod 52 is the maximum advanced state during the operation of the piston, the piston rod 52 compresses the resilient member 53 and the air in the piston barrel 51, and when the distance between the central axis of the disc and the piston rod 52 gradually becomes farthest, the piston rod 52 is pushed away from the piston barrel 51 under the restoring action of the resilient member 53, and the air outside enters the piston barrel 51. When the distance between the central axis of the disc and the piston rod 52 is the farthest, the state of the piston rod 52 is the maximum retracted state during the operation of the piston. During the above process, one end of the piston barrel is in abutment with and slides relative to the outer periphery of the eccentric part 54. With rotation of the roller 4, the piston rod 52 reciprocates in the piston barrel 51 repeatedly, thereby achieving the effect of pressurizing the water tank 3.

[0036] Referring to Figure 4 In a feasible embodiment, the end of the piston barrel 51 is provided with an end cover 55, which is used to prevent the piston rod 52 from falling during sliding. The end cover 55 limits the piston rod 52, preventing the piston rod 52 from falling during sliding.

[0037] Referring to Figure 3 and Figure 5In an embodiment, the robot further comprises a third connecting pipe 6, one end of which is connected to the piston structure 5, and the other end is provided with a gas release device 7 for controlling whether the piston structure 5 can generate a net negative pressure or a high pressure during the rotation of the roller 4. Further, the gas release device 7 comprises a fixed seat 71, a movable seat 72, and a gas release valve 73, the movable seat 72 is movably arranged on the fixed seat 71, and the gas release valve 73 is fixedly arranged on the movable seat 72. By moving the movable seat 72, the gas release valve 73 can be opened or closed to control whether the piston structure 5 can generate a net negative pressure or a high pressure during the rotation of the roller 4. Further, the fixed seat 71 is provided with a through hole 711, and the movable seat 72 is provided with a buckle 721. When the buckle 721 is inserted into the through hole 711, the buckle 721 can move in the through hole 711. Specifically, the fixed seat 71 is provided with four through holes 711, and the through holes 711 are provided with sufficient space for the buckle 721 to move. The upper side of the buckle 721 is provided with a driving slope, and the lower side is provided with a clamping surface. During installation, the buckle 721 is pressed into the through hole 711 under the action of the driving slope, so that the clamping surface abuts against the fixed seat 71, thereby limiting the downward displacement of the buckle 721, but not limiting the horizontal displacement of the buckle 721.

[0038] With reference to Figure 1 And Figure 2 In an embodiment, the bottom of the water tank 3 is provided with a containing cavity 31, and the first connecting pipe 1, the second connecting pipe 2, the roller 4, and the piston structure 5 are arranged in the containing cavity 31. In this way, the flatness of the bottom of the water tank 3 can be maintained, and the layout of the first connecting pipe 1, the second connecting pipe 2, the roller 4, and the piston structure 5 in the containing cavity 31 can be optimized, so that the robot occupies less space.

[0039] With reference to Figure 1 And Figure 2 In an embodiment, the opening cover of the containing cavity 31 is provided with a fixed cover 32, and the fixed cover 32 is provided with an opening through which the roller 4 passes. In this way, the components arranged in the containing cavity 31 can be protected, and the disassembly and installation of the components can be facilitated.

[0040] With reference to Figure 6In one possible embodiment, the water tank 3 is provided with a fourth connecting pipe 8, which comprises a first end 81 and a second end 82, the first end 81 is communicated with the water tank 3 at a position corresponding to the position where the second connecting pipe 2 is communicated with the water tank 3, and the second end 82 is downwardly opened to prevent the water in the water tank 3 from entering the second one-way valve 21. Specifically, the water tank 3 is formed with a first connecting end for connecting with the first end 81 and a second connecting end for connecting with the second end 82. The first connecting end is arranged in the water tank 3 at a position corresponding to the accommodating cavity 31, and the second connecting end is arranged at the bottom of the water tank 3. The height of the first connecting end is higher than that of the second connecting end. When installed, the first end 81 is inserted into the first connecting end and downwardly opened, and the second end 82 is inserted into the second connecting end and downwardly opened. In this way, the fourth connecting pipe 8 is in a curved state, and specifically, the fourth connecting pipe 8 is in an n-shaped structure. Since the height of the first end 81 is higher than that of the second end 82, and the second end 82 is downwardly opened, it can be ensured that the water in the water tank 3 will not enter the second one-way valve 21 due to gravity.

[0041] The application concept of using the roller 4 to drive the piston structure 5 to pressurize the water tank 3 is also applicable to a floor cleaning robot. Specifically, referring to Figures 7 to 9The application discloses a mopping robot, which comprises a body 100, a first rolling brush 101 rotatably arranged in the cavity, a second rolling brush 102 rotatably arranged in the cavity, a water scraping structure 103 formed in the cavity and abutting against the first rolling brush 101 and the second rolling brush 102 respectively to define a cleaning cavity, a cleaning water hole formed in the cleaning cavity for cleaning the first rolling brush 101 and the second rolling brush 102, a water suction port 105 formed in the cleaning cavity for sucking the sewage in the cleaning cavity, a sewage tank 106 communicated with the water suction port 105, a water tank 3 communicated with the cleaning water hole, a first connecting pipe 1 provided with a first one-way valve 11, a second connecting pipe 2 provided with a second one-way valve 21, one end of the first connecting pipe 1 communicated with the sewage tank 106 and the other end communicated with a piston structure 5, one end of the second connecting pipe 2 communicated with the water tank 3 and the other end communicated with the piston structure 5, and a roller 4 for generating a net negative pressure or a high pressure in the piston structure 5 during rotation. In the embodiment, when the roller 4 generates the high pressure in the piston structure 5 during rotation, the first one-way valve 11 is closed, the second one-way valve 21 is opened, the high-pressure air in the piston structure 5 enters the water tank 3, the air pressure in the water tank 3 is increased, the clean water in the water tank 3 is sprayed from the cleaning water hole under the action of the air pressure, the first rolling brush 101 and the second rolling brush 102 in the working state are flushed, and the flushed sewage is scraped by the water scraping structure 103 and stored in the cleaning cavity. When the roller 4 generates the net negative pressure in the piston structure 5 during rotation, the first one-way valve 11 is opened, the second one-way valve 21 is closed, the air in the sewage tank 106 enters the piston structure 5 through the first connecting pipe 1, the air pressure in the sewage tank 106 is reduced, the suction force of the water suction port 105 is generated, the sewage scraped in the cleaning cavity is sucked by the water suction port 105 and stored in the sewage tank 106, and the first rolling brush 101 and the second rolling brush 102 in the working state are cleaned and the sewage is cleaned. The mopping robot in the embodiment can realize the functions of automatic water discharge and water suction without external power source at a lower cost.In the embodiment, the specific structures of the sewage tank 106, the water tank 3, the first connecting pipe 1, the second connecting pipe 2, the roller 4 and the piston structure 5 can refer to the foregoing description, and those skilled in the art can adaptively adjust the connection relationship of the above components according to the actual situation of the product. Here, no longer tedious.

[0042] Further, the wiper structure 103 comprises a first wiper 1031 and a second wiper 1032 formed in the cavity, the first wiper 1031 abuts against the first roller brush 101, and the second wiper 1032 abuts against the second roller brush 102. In the working state, the first roller brush 101 and the second roller brush 102 roll in the cleaning cavity, and the first roller brush 101 and the second roller brush 102 rotate in a manner that the upper sides are separated. The first wiper 1031 scrapes the sewage of the first roller brush 101 into the cleaning cavity, and the second wiper 1032 scrapes the sewage of the second roller brush 102 into the cleaning cavity.

[0043] The components in the above-mentioned embodiments of the robot vacuum cleaner or the robot mop (for example, the motor for driving the roller 4 to rotate) are controlled by a control panel arranged in the robot vacuum cleaner or the robot mop. Each component is connected to the control panel and is controlled and driven by the control panel. When the motor is needed, the control panel is only required to be sent a control instruction, and the motor is controlled to operate accordingly by the control panel, so that the control of the motor is realized. In the embodiment, it is not limited to the way of sending the control instruction to the control panel. Specifically, the existing technologies such as the key control, the remote control, the intelligent control or the remote control can be used. In the application, those skilled in the art can apply the existing control mode to the embodiment according to the actual needs, and no detailed description is given here.

[0044] The above-mentioned only is the preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent flow conversion, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A robotic vacuum cleaner, characterized in that, include: The system comprises a water tank, a first connecting pipe, a second connecting pipe, a roller, and a piston structure. The bottom of the water tank has a water outlet. The first connecting pipe is equipped with a first one-way valve, and the second connecting pipe is equipped with a second one-way valve. One end of the first connecting pipe is connected to the outside, and the other end is connected to the piston structure. One end of the second connecting pipe is connected to the water tank, and the other end is connected to the piston structure. During rotation, the roller causes the piston structure to generate net negative pressure or high pressure. During the sweeping process, when the roller generates a net negative pressure in the piston structure during rotation, the first one-way valve opens and the second one-way valve closes, allowing outside air to enter the piston structure through the first connecting pipe; when the roller generates high pressure in the piston structure during rotation, the first one-way valve closes and the second one-way valve opens, allowing high-pressure air in the piston structure to enter the water tank, increasing the air pressure inside the water tank, and causing the water in the water tank to be discharged from the outlet under the action of air pressure. The piston structure includes a piston cylinder and a piston rod. During rotation, the roller drives the piston rod to slide inside the piston cylinder, thereby generating a net negative pressure or a high pressure inside the piston cylinder. The roller is provided with a cam, and a ring is fitted on the cam. The outer circumference of the ring is movably connected to the piston rod. When the roller rotates, it drives the cam to rotate, and the cam moves relative to the ring inside the ring. When the protrusion direction of the cam's protrusion is opposite to that of the piston rod, the piston rod is pushed into the piston cylinder. When the protrusion direction of the cam's protrusion is opposite to that of the piston rod, the piston rod is pulled out of the piston cylinder. The piston structure further includes an elastic element disposed within the piston cylinder. An eccentric component is formed on the roller. One end of the piston rod extending out of the piston cylinder abuts against the eccentric component, and the other end of the piston rod located within the piston cylinder abuts against the elastic element. During rotation, the roller drives the eccentric component to rotate. When the roller rotates, the eccentric component drives the piston rod to move from a maximum retracted state to a maximum forward state within the piston cylinder, generating high pressure within the piston cylinder. When the roller rotates, the elastic element drives the piston rod to move from a maximum forward state to a maximum retracted state within the piston cylinder, generating net negative pressure within the piston cylinder. The eccentric component is a disc, and the middle part of the roller is recessed inward to form a groove. The disc is disposed in the groove, wherein the central axis of the disc and the central axis of the roller are not on the same straight line. When the roller drives the disc to rotate, the piston rod is in its maximum forward state when the distance between the central axis of the disc and the piston rod is the closest, and the piston rod is in its maximum backward state when the piston is working when the distance between the central axis of the disc and the piston rod is the farthest. One end of the piston cylinder is in contact with the outer peripheral surface of the eccentric component from beginning to end, and the other end of the piston cylinder slides relative to the outer peripheral surface of the eccentric component from beginning to end. The sweeping robot also includes a third connecting pipe, one end of which is connected to the piston structure, and the other end is provided with a venting device. The venting device is used to control whether the piston structure can generate net negative pressure or high pressure during the rotation of the roller. The venting device includes a fixed base, a movable base, and a venting valve. The movable base is movably mounted on the fixed base, and the venting valve is fixedly mounted on the movable base. By moving the movable base, the venting valve opens or closes one end of the third connecting pipe, thereby controlling whether the piston structure can generate net negative pressure or high pressure during the rotation of the roller. The fixed base has an insertion hole, and the movable base has a buckle. When the buckle is inserted into the insertion hole, the buckle moves within the insertion hole. The upper side of the buckle has a driving slope, and the lower side has a snap-fit ​​surface. The water tank is equipped with a fourth connecting pipe, which includes a first end and a second end communicating with the water tank. The communication position between the first end and the water tank corresponds to the communication position between the second connecting pipe and the water tank. The opening of the second end faces downward to prevent water in the water tank from entering the second one-way valve. The water tank has a first connecting end for connecting with the first end and a second connecting end for connecting with the second end. The first connecting end is located in the water tank at a position corresponding to the receiving cavity, and the second connecting end is located at the bottom of the water tank. The height of the first connecting end is higher than the height of the second connecting end. The first end is inserted into the first connecting end with its opening facing downward, and the second end is inserted into the second connecting end with its opening facing downward. The fourth connecting pipe is in a bent state.

2. The sweeping robot according to claim 1, characterized in that, The piston cylinder is provided with an end cap at its end, which is used to prevent the piston rod from falling off during sliding.

3. The sweeping robot according to claim 1, characterized in that, The bottom of the water tank forms a receiving cavity, and the first connecting pipe, the second connecting pipe, the roller, and the piston structure are all located in the receiving cavity.

4. The sweeping robot according to claim 3, characterized in that, The opening of the receiving cavity is covered with a fixed cover, and the fixed cover has an opening through which the roller can pass.

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