Intelligent control surface cleaning device

Abstract

The invention provides an intelligent control surface cleaning device which comprises a sewage suction motor, a machine body and a ground brush, and a detachable sewage bucket assembly is arranged on the machine body; the floor brush is provided with a cleaning assembly and a dirt suction opening. The main control unit is used for controlling the sewage suction motor and the cleaning assembly to work; the sewage bucket assembly comprises a bucket body and a top cover buckled on the bucket body, the machine body has a lying cleaning working state and an inclined cleaning working state, the sewage bucket assembly is provided with a liquid level detection electrode, the liquid level detection electrode obtains a liquid level signal of dirty liquid in the bucket body changing along with the inclination angle of the machine body, and the main control unit controls the main control unit according to the liquid level signal. According to the technical scheme, whether the machine body is in the flat-lying working state or not is judged by detecting liquid level signal changes in real time, judgment is more accurate, the possibility that the dirt suction motor is polluted is avoided, the surface cleaning device works with more reasonable working parameters, and the working efficiency is improved. Therefore, the surface cleaning device works more accurately, flexibly and intelligently.

Description

Technical Field

[0001] The invention belongs to the technical field of cleaning appliances, and specifically provides a surface cleaning device. Background Art

[0002] With the development of cleaning technology, surface cleaning devices have gradually become the main equipment for floor cleaning. Surface cleaning devices generally include a floor brush, a body, a water supply system, and a sewage suction system. The lower part of the body is pivotally connected to the rear of the floor brush. The floor brush is generally provided with a scraper, a roller brush, and a water supply port. Some surface cleaning devices also have a sewage suction port on the floor brush. A sewage bucket and a sewage suction motor are installed on the body. An exhaust port is provided on the front side of the top cover of the sewage bucket. The sewage suction system includes a sewage bucket, a sewage suction pipe, and a sewage suction motor. The sewage bucket is connected to the sewage suction port through the sewage suction pipe. When the surface cleaning device is performing cleaning work, customers generally put The machine body is adjusted to a state of inclination with the floor brush so that the customer can push the machine body more comfortably and conveniently. At this time, the water supply system supplies water to the roller brush or the surface to be cleaned through the water supply port. The roller brush rotates to rub and clean the surface to be cleaned. The scraper scrapes the bristles on the roller brush to scrape off the dirt or dirty liquid. The sewage suction motor starts, and the air flow in the sewage bucket is sucked into the machine body through the exhaust port and discharged from the machine body, so that negative pressure is generated in the sewage bucket, and the dirty liquid or dirt is sucked into the sewage bucket through the sewage suction port and the sewage suction pipe.

[0003] However, when the cleaning device needs to clean a low space, such as under a sofa or bed, the floor brush can only enter the low space by adjusting the body to a smaller angle with the floor to be cleaned (or the floor brush) or lying flat on the surface to be cleaned. At this time, the sewage bucket lies flat with the body, and the exhaust port and the sewage suction motor are lowered, so that the vertical height of the exhaust port and the sewage suction motor is greatly reduced and closer to the surface to be cleaned, thereby reducing the minimum straight-line distance between the sewage level in the sewage bucket and the exhaust port. When the sewage suction motor is working, if the power of the sewage suction motor remains unchanged, the distance the sewage travels in the sewage bucket remains unchanged. Under the action of the sewage suction motor, the sewage is drawn into the sewage bucket and moves forward, which makes it easier to be sucked into the exhaust port, or even pass through the exhaust port into the body, contaminating the sewage suction motor, affecting the working performance and even safety of the sewage suction motor. To solve the above technical problems, most existing technologies install an angle sensor on the body. When the angle between the body and the surface to be cleaned is less than a set threshold, the power of the sewage suction motor is reduced, thereby reducing the probability of sewage being sucked into the exhaust port. However, the prior art only considers adjusting the power of the sewage suction motor when the machine body is tilted to lie flat. The above technical solution cannot detect whether there is sewage and the actual position of the sewage in the sewage bucket. When the sewage bucket has tilted with the machine body but there is relatively little sewage in the sewage bucket, it is easy for the sewage suction motor to reduce power too early, thereby affecting the sewage suction efficiency. When the customer has been using the surface cleaning device for a period of time and there is already a lot of sewage in the sewage bucket, especially when the sewage in the sewage bucket is close to being full, and the customer needs to clean the surface of a lower space at this time, the customer adjusts the machine body from the tilted state. When the machine is in a lying position, it is easy for the sewage suction motor to delay reducing the sewage suction power and cause water pollution to the sewage suction motor. That is, at this time, the sewage will climb up along the wall of the sewage barrel as the machine body tilts, and the machine body has not reached the set angle threshold of the lying position at this time. The sewage suction motor still works at a higher sewage suction power, and the rising height of the sewage remains unchanged. The sewage is directly sucked to the exhaust port, and then flows into the sewage suction motor of the machine body through the exhaust port, causing the sewage suction motor to be directly damaged by water, which not only makes the surface cleaning device unable to work normally, but also reduces the service life of the sewage suction motor, and the customer experience is poor. Summary of the Invention

[0004] The purpose of the present invention is to provide a surface cleaning device, whose main control unit can flexibly handle surface cleaning work in different environments, and can identify the position of sewage in the sewage bucket, and adjust the power of the sewage suction motor according to the sewage position and the working state of the fuselage, which not only solves the pollution problem of the sewage suction motor, but also makes the surface cleaning device work more intelligently.

[0005] In order to achieve the above-mentioned objectives, the present invention provides an intelligently controlled surface cleaning device, comprising a sewage suction motor, which provides power for sucking and collecting dirty liquid or dirt; a body, on which is provided a detachable sewage bucket assembly; a floor brush, which is hinged to the body and provided with a cleaning assembly and a sewage suction port; a main control unit, which is used to control the operation of the sewage suction motor and the cleaning assembly; the sewage bucket assembly comprises a barrel body and a top cover buckled on the barrel body, the body has a flat cleaning working state and a tilted cleaning working state, the sewage bucket assembly is provided with a liquid level detection electrode, the liquid level detection electrode obtains a liquid level signal of the dirty liquid in the barrel body that changes with the tilt angle of the body, and the main control unit determines whether the body is in the flat cleaning working state based on the liquid level signal.

[0006] Furthermore, the second electrode includes a first electrode arranged at the bottom of the barrel body and a second electrode arranged adjacent to the rear side wall of the barrel body, the detection end of the second electrode is located in the middle of the barrel body in the height direction, and the main control unit is electrically connected to the first electrode and the second electrode respectively, and the liquid level signal includes a liquid-free trigger signal and a liquid-containing trigger signal; the second electrode obtains the liquid level signal in the sewage bucket, and the liquid level signal includes a liquid-free trigger signal and a liquid-containing trigger signal; the surface cleaning device starts the cleaning operation, and the main control unit controls the sewage suction motor to work at the first sewage suction power according to the liquid-free trigger signal; the fuselage has a flat cleaning working state and a tilted cleaning working state, and the main control unit determines that the fuselage is lying flat for cleaning according to the liquid trigger signal, and controls the sewage suction motor to work at the second sewage suction power; the second sewage suction power is less than the first sewage suction power.

[0007] Furthermore, the first electrode includes a sensing end, which is arranged on the bottom wall of the barrel and the sensing end is at least partially exposed on the bottom wall of the barrel, so that the sewage in the barrel contacts the sensing end when the sewage suction motor is working.

[0008] Furthermore, the first electrode extends from the front side wall of the barrel body to the rear side wall of the barrel body, and the sensing end is located in the area between the rear side wall and the central axis plane of the sewage barrel.

[0009] Furthermore, the first electrode has a plurality of sensing ends, and the distance between at least one sensing end and the rear wall of the sewage bucket is less than half and greater than one quarter of the thickness of the sewage bucket.

[0010] Furthermore, the second electrode is arranged on the rear side wall of the barrel body; or, the second electrode extends downward from the top cover, and its extension direction is perpendicular to the extension direction of the first electrode.

[0011] Furthermore, the front and rear thickness of the inner cavity of the sewage bucket is b, and the distance from the detection end of the liquid level electrode to the first electrode along the height direction of the sewage bucket is h, where h satisfies 1.5b≤h<2b, so that the sewage bucket is converted from a tilted working state to a flat working state as the body of the sewage bucket is converted, and when the dirty liquid in the bucket body rises to the detection end of the second electrode, the liquid level detection circuit is turned on and sends a liquid trigger signal to the main control unit, and the main control unit controls the reduction of the current working power or current working speed of the sewage suction motor according to the liquid trigger signal; or, the main control unit controls the conversion of the first sewage suction power of the sewage suction motor to the second sewage suction power according to the liquid trigger signal.

[0012] Furthermore, it also includes a liquid full detection electrode, which includes a sensing surface exposed inside the barrel body. The liquid full detection electrode extends along the height direction of the sewage barrel. The liquid full detection electrode is electrically connected to the main control unit. When the dirty liquid in the barrel body rises to contact the sensing surface of the liquid full detection electrode, the liquid full detection circuit is turned on and a liquid full signal is sent. The main control unit controls the sewage suction motor to stop working according to the liquid full signal.

[0013] Furthermore, the sensing surface of the liquid-full electrode is located in the middle of the sewage bucket in the height direction and the front-to-back direction, and the detection end of the second electrode is not higher than the detection end of the liquid-full detection electrode.

[0014] Furthermore, an exhaust port is provided on the top cover, and a sewage inlet pipe connected to the sewage suction port is provided on the barrel body. The body is in a flat working state, the sewage inlet pipe is located above one-half of the inner cavity of the sewage barrel, the detection end of the second electrode is arranged close to the surface to be cleaned, and a sewage baffle is provided between the detection end of the second electrode and the sewage inlet pipe, and the exhaust port and the pipe mouth of the sewage inlet pipe are separated by the sewage baffle.

[0015] Beneficial effects of one or more of the above technical solutions:

[0016] 1. The present invention provides a liquid level detection electrode on the sewage bucket assembly. The liquid level detection electrode obtains a liquid level signal of the dirty liquid in the bucket body that changes with the tilt angle of the machine body. The main control unit determines whether the machine body is in a flat cleaning working state based on the liquid level signal. This technical solution determines whether the machine body is in a flat working state by detecting the change of the liquid level signal in real time, and the judgment is more accurate. Since the sewage bucket assembly is arranged on the machine body and fits with the machine body, the barrel wall of the sewage bucket fits with the machine body. Therefore, when the machine body is tilted and the tilt angle with the surface to be cleaned changes, the distance between any point on the machine body and the surface to be cleaned will change. The distance between the point on the barrel wall of the sewage bucket corresponding to the equal height of any point on the machine body and the surface to be cleaned changes in accordance with the change of the machine body. The liquid in the sewage bucket assembly is close to the barrel wall of the sewage bucket, so the dirty liquid changes with the equal height points on the barrel wall of the sewage bucket. Therefore, the height of the liquid level in the sewage bucket can best reflect the tilt angle of the machine body. Therefore, the liquid in the barrel body is detected by the liquid level detection electrode. The liquid level signal can be used to determine whether the body is in a flat position. It can not only detect whether there is dirty liquid in the barrel, but also determine the height and amount of the dirty liquid according to the liquid level signal, and then accurately determine the tilt angle of the body and whether it is in a flat cleaning working state. The main control unit determines the tilt angle of the body according to the liquid level signal and then controls the surface cleaning device to work with reasonable working parameters, such as water supply, speed of the cleaning component, and suction power of the suction motor, so that it can clean efficiently and be in a safe working environment without being contaminated or even damaged by dirty liquid. That is, this solution can avoid the problem of the surface cleaning device changing the working parameters in advance when there is less sewage due to monitoring the tilt angle of the body alone, and can also avoid the problem of the surface cleaning device delaying the change of working parameters when there is too much sewage, and avoid the dirty liquid sloshing and splashing to the upper port of the barrel when the body is in a flat cleaning working state, or avoid the problem of over-limit operation caused by the sewage barrel component changing with the body position while the parameters of the water supply system, suction motor, cleaning component, etc. remain unchanged. The control method of this technical solution makes the operation of the surface cleaning device more accurate, flexible and intelligent.

[0017] 2. The present invention provides a liquid level detection electrode including a first electrode provided on the bottom wall of the barrel body and a second electrode provided adjacent to the rear side wall of the barrel body. As long as there is sewage in the barrel body, it will inevitably contact the first electrode. Since the detection end of the second electrode is located in the middle along the height direction of the barrel body, the positions of the detection end of the second electrode, the first electrode, and the upper end of the barrel body are fixed, which reserves sufficient space for storing sewage in the barrel body. This solution also allows the height of the detection end of the second electrode to change synchronously or nearly synchronously with the tilt of the body. In particular, the height of the liquid surface in the barrel body also changes with the height of any point on the side wall of the barrel body at the same height as the detection end or the height position of the liquid level detection end. Therefore, this technical solution can reasonably set the positions of the detection end of the second electrode and the first electrode, so that the liquid level detection circuit can detect in real time that the height position of the sewage in the barrel body changes with the tilt of the body or the barrel body, thereby judging the angle of the body tilt. The main control unit is electrically connected to the second electrode and the first electrode respectively; the body has a lying cleaning working state and a tilted cleaning working state; the liquid level detection electrode obtains the liquid level signal in the sewage bucket, and the liquid level signal includes a liquid-free trigger signal and a liquid-containing trigger signal; the surface cleaning device starts the cleaning work, and the main control unit controls the sewage suction motor to work at the first sewage suction power according to the liquid-free trigger signal; the air flow in the barrel body is sucked to generate a negative pressure in the barrel body, and the sewage is sucked into the barrel body and contacts the first electrode. Since the detection end of the second electrode is located in the middle of the barrel body in the height direction, when the body is still in the tilted working state and the sewage does not rise to the detection end of the second electrode, the liquid level detection circuit is not conductive, and a liquid-free trigger signal is issued. The sewage suction motor continues to work at the first sewage suction power; and when the customer adjusts the inclination angle of the machine body to a smaller angle with the surface to be cleaned, so that the dirty liquid in the barrel body contacts the detection end of the second electrode, the liquid level detection circuit is turned on and a liquid trigger signal is sent. The liquid level detection circuit is turned on, and the main control unit determines that the machine body is lying flat for cleaning according to the liquid trigger signal, and controls the sewage suction motor to work at the second sewage suction power; the second sewage suction power is less than the first sewage suction power, so that when the machine body is in a lying working state and dirty liquid enters the barrel body, the height to which the dirty liquid rises in the barrel body is reduced, thereby ensuring the amount of liquid stored in the barrel body, ensuring the sewage suction effect, and at the same time avoiding the dirty liquid rising too high and entering the machine body to contaminate the sewage suction motor. That is, this solution can avoid the problem of premature power reduction of the sewage suction motor when there is less sewage due to monitoring the inclination angle of the fuselage alone, and can also avoid the problem of delayed power reduction of the sewage suction motor when there is too much sewage. While ensuring the sewage suction efficiency of the sewage suction motor, it can avoid the sewage from sloshing and splashing to the upper port of the barrel when the fuselage is lying flat, or the upper port of the sewage barrel changes with the position of the fuselage while the power of the sewage suction motor remains unchanged, resulting in excessive suction force, causing the sewage to be sucked to the upper port of the sewage barrel, and even enter the fuselage and pollute the sewage suction motor.

[0018] 3. The first electrode includes a sensing end, which is arranged on the bottom wall of the barrel body and the sensing end is at least partially exposed to the bottom wall of the barrel body, so that the dirty liquid in the barrel body contacts the sensing end when the sewage suction motor is working. This solution enables the first electrode in the liquid level detection circuit to detect as long as there is sewage in the barrel body, avoiding the problem that the sewage cannot contact the first electrode. In the prior art, the sensing end of the first electrode is set relatively high, and the second electrode and the first electrode will be connected only when there is a lot of dirty liquid. This will result in a lot of dirty liquid. When the fuselage body is converted from a tilted working state to a flat working state, especially when the fuselage body is parallel to the surface to be cleaned, such as the bottom surface, the dirty liquid flows directly from the barrel body to the exhaust port, and then Combined with the suction of the sewage suction motor, the sewage will directly enter the body and pollute the sewage suction motor. However, in this solution, as long as there is sewage in the barrel and the sewage rises to the detection end of the second electrode, it is possible that there is not much sewage at this time, but the sewage flows to the detection end due to the tilt of the body, or it is possible that a lot of sewage rises to the detection end, then the main control unit controls the sewage suction motor to adjust the power, such as reducing the power of the sewage suction motor, thereby avoiding the probability of sewage flowing to the exhaust port; and when there is no sewage in the barrel, even if the body is tilted, the first and second electrodes will not be connected, and the liquid level detection circuit will not be triggered to turn on. This solution can reasonably utilize the sewage suction motor, so that it works in the handover state, with high sewage suction efficiency and good sewage suction effect. Therefore, the operation of the surface cleaning device is more intelligent.

[0019] 4. By extending the first electrode from the front side wall of the barrel body to the rear side wall of the barrel body, the sensing end is located in the area between the rear side wall and the central axis of the sewage barrel. Such an arrangement allows the barrel body to be identified as long as there is a little sewage in the barrel body, regardless of whether the barrel body is in an inclined working state or a flat working state, thereby better judging the working state of the barrel body according to the position change of the sewage in the barrel body, so that the liquid level detection circuit is triggered and turned on in time, thereby facilitating the main control unit to control the operation of the sewage suction motor; for example, when the barrel body is in a normal inclined working state, the common point and the sensing end are exposed on the bottom wall. When sewage is pumped into the barrel body and gradually increases to the sensing end of the second electrode, the second electrode is triggered. When the liquid level detection circuit is turned on, the main control unit controls the sewage suction motor to reduce the power, thereby preventing the sewage from being splashed into the exhaust port due to the shaking of the body pushed forward and backward by the customer when there is a lot of sewage. Alternatively, although the sewage does not trigger the detection end of the second electrode when the body is in the tilted working state, when the customer switches the body from the tilted working state to the flat working state according to cleaning needs, as the body gradually tilts, the sewage can flow to the detection end of the second electrode as the body tilts, thereby causing the main control unit to control the sewage suction motor to reduce the power, so that the power or speed of the sewage suction motor can be reduced before the body enters the flat working state, thereby avoiding the possibility of the sewage suction motor being contaminated after the body is laid flat. If the sewage liquid is less (because the sensing end is located below the central axis of the sewage bucket, that is, the sewage has not reached the central axis of the sewage bucket, that is, half of the sewage bucket), during the conversion of the working state of the fuselage body, when the fuselage body enters the lying state, the sewage rises again and touches the sensing end of the first electrode (the central axis of the sewage bucket and below) and the detection end of the second electrode. It is still possible to conduct the first electrode and the detection end when the sewage reaches the sensing end, and then reduce the working power or speed of the sewage suction motor, which can effectively prevent the sewage from being sucked to the exhaust port by the sewage suction motor; and when the fuselage body is in the lying working state, since the first electrode extends from the front side wall of the barrel body to the rear side wall of the barrel body, the sensing end is located below the central axis of the sewage bucket to the rear side wall. Area, that is, at this time the sensing end is located below the central axis and not at the position of the rear side wall. The sewage bucket generally tilts with the rear of the body until it lies flat, so at this time the rear side wall is generally close to the surface to be cleaned or parallel to the surface to be cleaned, so that the detection end of the second electrode is at a lower position than the sensing end of the first electrode. At this time, if there is no dirty liquid, there is no need to reduce the power of the sewage suction motor, so that the sewage suction motor can work efficiently to suck sewage. After sewage is pumped into the barrel body, as the dirty liquid rises, the dirty liquid rises to the sensing end of the first electrode, then the liquid level detection circuit is turned on, and the main control unit controls the sewage suction motor to reduce the power or speed, thereby avoiding sewage being sucked into the exhaust port or even polluting the motor.

[0020] 5. By providing the first electrode with multiple sensing terminals, the multiple sensing terminals of the first electrode can be used in conjunction with each other, avoiding detection failure caused by failure of a single sensing terminal. The liquid level detection circuit can more accurately identify the presence of sewage, thereby improving the detection accuracy of the liquid level detection circuit. By setting the distance between at least one sensing terminal and the rear wall of the sewage bucket to be less than half the thickness of the sewage bucket and greater than one-quarter, when the body is in a flat working state, since the sewage bucket is flat at this time, when the sewage in the bucket exceeds one-quarter of the thickness of the bucket but has not yet reached the middle of the sewage bucket, the sewage can reach the sensing terminal, thereby connecting the first electrode and the second electrode, causing the liquid level detection circuit to be turned on and triggered, and then the main control unit promptly controls the sewage suction motor to reduce the power or speed. This not only allows the sewage suction motor to complete the sewage suction work in a more reasonable and efficient manner, but also improves the sewage suction efficiency, improves the sewage suction effect, and avoids contamination of the sewage suction motor. This arrangement ensures that when the first electrode is turned on, the volume of sewage in the sewage bucket does not need to be too much, but not too little, so as to maintain a balance between the sewage suction efficiency of the sewage suction motor and preventing water ingress.

[0021] 6. The second electrode is arranged on the rear wall of the barrel body; or, the second electrode extends downward from the top cover, and its extension direction is perpendicular to the extension direction of the first electrode. Since the first electrode is arranged at the bottom of the barrel body, this arrangement makes it easy to make the extension direction of the liquid level electrode parallel to the rear wall of the sewage bucket. Since the rear wall of the sewage bucket is close to the body or located at the rear of the body, the position changes of the rear wall of the sewage bucket and the body are more synchronized or more approximately synchronized, so that the position change of the detection end of the liquid level electrode is closer to the position change of the point on the body at the same height as the detection end of the second electrode. When sewage is pumped into the barrel body, the barrel body tilts with the body and the sewage reaches the detection end, the liquid level detection electrode The circuit can be accurately triggered and turned on. When the fuselage is switched from a tilted working state to a flat working state, it can be determined whether the tilt angle of the fuselage reaches the flat working state, thereby enabling the main control unit to control and adjust the power of the sewage suction motor, reduce the probability of sewage entering the exhaust port, and prevent sewage from entering the fuselage and contaminating the sewage suction motor. When the fuselage directly enters the flat working state, it can also better detect the position of the sewage in the barrel. If the sewage does not reach the level that connects the detection end of the second electrode with the first electrode, the sewage suction motor still works at the originally set power. When the sewage connects the detection end of the second electrode with the first electrode, the main control unit controls the power of the sewage suction motor to be reduced, thereby preventing the sewage suction motor from being contaminated. Such a solution has a good sewage suction effect, and the sewage suction motor is in a reasonable working state, without wasting resources, and the operation of the surface cleaning device is more intelligent and precise. In this setting, when the body is in a tilted working state, one end of the first electrode connected to the front side wall of the sewage bucket is tilted upward, and the other end is tilted toward the rear side wall and extends downward; when the volume of sewage is not enough to rise to contact the first electrode and the second electrode and connect the two, the liquid level detection circuit will not be turned on. That is, when there is very little sewage in the sewage bucket, the liquid level electrode will not be connected to the first electrode to cause the liquid level detection circuit to be turned on, thereby feeding back to the main control unit to control the power reduction of the sewage suction motor.

[0022] 7. It also includes a liquid full detection electrode, which includes a sensing surface exposed within the barrel. The liquid full detection electrode extends along the height of the sewage barrel and is electrically connected to the main control unit. When the sewage in the barrel rises to the point where it contacts the sensing surface of the liquid full detection electrode, the liquid full detection circuit is energized and a liquid full signal is emitted. The main control unit then controls the sewage suction motor to stop operating based on the liquid full signal. This arrangement facilitates timely detection of the sewage full signal within the barrel, regardless of whether the machine is in a flat or tilted working position, and can promptly control the sewage suction motor to stop operating when the sewage barrel is full. The sensing surface of the liquid-full electrode is located in the middle of the sewage bucket in the height direction and the front-to-back direction, and the detection end of the second electrode is not higher than the detection end of the liquid-full detection electrode. Therefore, the position of the detection end of the second electrode is set lower than half the height of the sewage bucket, so that no matter whether the machine body is in a tilted working state or a flat working state or in the process of converting between the two states, the main control unit can adjust the working power or speed of the sewage suction motor in time when the sewage liquid is not full, and the sewage suction motor can stop working in time when the sewage liquid reaches the full position to avoid contamination of the sewage suction motor, and at the same time remind the customer to pour out the sewage liquid in time to avoid contamination of the sewage suction motor due to too much sewage stored in the sewage bucket.

[0023] 8. An exhaust port is provided on the top cover, and a sewage inlet pipe connected to the sewage suction port is provided on the barrel body. The body is in a flat working state, the front side wall of the barrel body is located at the upper part of the barrel body, the rear side wall of the barrel body is located at the lower part of the barrel body, and the sewage inlet pipe is located above one-half of the inner cavity of the sewage barrel. The detection end of the second electrode is arranged close to the surface to be cleaned, and a dirt baffle is provided between the detection end of the second electrode and the sewage inlet pipe. The exhaust port and the pipe opening of the sewage inlet pipe are separated by the dirt baffle. In this solution, the dirt baffle separates the upper part of the sewage barrel into a first space and a second space. The second electrode and the exhaust port are arranged in the second space, and the sewage inlet pipe extends upward into the first space. The exhaust port on the top cover is arranged toward the inside of the barrel body but not perpendicular to the side wall of the barrel body, and the dirt baffle is arranged between the sewage inlet pipe and the exhaust port. This arrangement can ensure the separation between the pipe opening of the sewage inlet pipe, the exhaust port, and the detection end of the second electrode, and prevent the dirt sucked out of the sewage inlet pipe from directly splashing onto the exhaust port and the detection end. In this solution, when the fuselage body is in a flat position, the sewage inlet pipe is higher than half of the inner cavity of the sewage bucket, thereby avoiding the problem of backflow of the sewage inlet pipe when the sewage bucket is in a flat position. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Some embodiments of the present application are described below with reference to the accompanying drawings, in which:

[0025] Figure 1 This is a schematic diagram of the surface cleaning device in Example 1 in a tilted working state;

[0026] Figure 2This is a schematic diagram of the surface cleaning device in Example 1 in a flat working state;

[0027] Figure 3 yes Figure 1 A schematic diagram of the wastewater bucket assembly being separated from the mid-body when the mid-body is standing upright and resting on a surface to be cleaned;

[0028] Figure 4 This is a schematic diagram of the connection between the main control unit and the liquid level detection circuit in Example 1;

[0029] Figure 5 is a cross-sectional view of the sewage bucket assembly in Example 1;

[0030] Figure 6 is a schematic diagram of the sewage bucket assembly in the first embodiment in a tilted working state;

[0031] Figure 7 This is a schematic diagram of the sewage bucket assembly in the first embodiment in a first lying working state;

[0032] Figure 8 1 is a schematic diagram of the sewage bucket assembly in the first embodiment in the second lying working state;

[0033] Figure 9 1 is a schematic diagram of the sewage bucket assembly in the first embodiment in the third state of lying flat;

[0034] Figure 10 This is a schematic diagram of the case where the angle between the sewage bucket assembly and the surface to be cleaned in the first embodiment is zero;

[0035] Figure 11 is a cross-sectional view of the barrel in the main viewing direction in Example 1;

[0036] Figure 12 is a cross-sectional view of the sewage bucket in the first embodiment when viewed from above;

[0037] Figure 13 This is a schematic diagram of the connection between the main control unit in Example 1 and the liquid level detection circuit and the liquid full detection circuit;

[0038] Figure 14 is a schematic diagram of the symmetrical arrangement of liquid-filled electrodes in Example 1;

[0039] Figure 15 This is a schematic diagram of the connection between the main control unit and the liquid level detection circuit, the liquid full detection circuit, and the surge detection circuit in Example 2;

[0040] Figure 16 is a cross-sectional view of the sewage bucket assembly in Example 2 when the inclination angle α with respect to the surface to be cleaned is 30°;

[0041] Figure 17is a cross-sectional view of the sewage bucket assembly in Example 2 when the inclination angle α with the surface to be cleaned is 0°;

[0042] Figure 18 is a schematic diagram of a third embodiment of the present invention in which the fuselage is in a tilted working state;

[0043] Figure 19 This is a schematic diagram of the body in the third embodiment of the present invention in a flat working state.

[0044] The reference numerals are as follows:

[0045] 1. Handle; 2. Body; 3. Clean water tank; 4. Sewage bucket assembly; 41. Top cover; 411. Sewage level;

[0046] 412, exhaust port; 413, first contour line; 414, upper cover; 415, lower cover; 416, accommodating cavity;

[0047] 42. Liquid full detection electrode; 421. Sensing surface; 423. Second contour line; 43. Rebar; 433. Third contour line;

[0048] 44. Barrel body; 441. Second mounting groove; 442. Bottom wall; 443. Rear side wall; 444. Front side wall; 445. Groove;

[0049] 45. Inner cavity; 403. Fourth contour line; 461. Baffle; 462. Side panel; 47. Surge detection electrode; 471. Detection end; 48. Sewage inlet pipe; 49. Second electrode; 491. Detection end; 410. First electrode; 4101. Sensing end; 5. Floor brush; 6. Surge detection circuit; 7. Liquid level detection circuit; 8. Main control unit; 9. Liquid full detection circuit. DETAILED DESCRIPTION

[0050] It should be noted that, in the description of this application, terms such as "first", "second", "center", "up", "down", "top", "bottom", "vertical", "horizontal", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on this application. The terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two elements.

[0051] The surface cleaning device in the present application may be a floor scrubber, a carpet cleaning machine, a desktop cleaner, a sweeping and mopping robot, or other devices used for cleaning.

[0052] As the surface cleaning device of the present invention, Figures 1-17 As shown, it includes a main control unit 8, a body 2, a floor brush 5 and a liquid level detection circuit 7. The liquid level detection circuit 7 is connected to the main control unit 8. The body 2 is provided with a sewage bucket assembly 4 and a sewage suction motor (not shown in the figure). The floor brush 5 is provided with a cleaning assembly. The main control unit is used to control the operation of the sewage suction motor and the cleaning assembly. The lower part of the body 2 is pivotally connected to the rear of the floor brush 5. The body 2 has a tilted working state and a flat working state. Figure 1 、 Figure 2 、 Figure 18 and Figure 19 As shown, the fuselage also has an upright static state, such as Figure 3The sewage bucket assembly 4 includes a barrel body 44 and a top cover 41 buckled onto an upper port of the barrel body 44. The barrel body 44 is provided with a sewage inlet pipe 48 connected to the sewage suction port. The sewage bucket assembly 4 is provided with a liquid level detection electrode. The liquid level detection electrode obtains a liquid level signal of the sewage in the barrel body 44 that changes with the tilt angle of the machine body 2. The main control unit 8 determines whether the machine body 2 is in the flat cleaning working state based on the liquid level signal. Since the sewage bucket assembly 4 is arranged on the fuselage 2 and fits with the fuselage 2, the barrel wall of the barrel body 44 is fitted with the fuselage 2, so when the fuselage 2 is tilted and the inclination angle between it and the surface to be cleaned changes, the distance between any point on the fuselage 2 and the surface to be cleaned will change, and the distance between the point on the barrel wall of the barrel body 44 corresponding to the equal height of any point on the fuselage 2 and the surface to be cleaned changes in accordance with the change of the fuselage. The liquid in the sewage bucket assembly 4 is close to the barrel wall of the barrel body 44, so the sewage liquid changes with the equal height points on the barrel wall of the barrel body 44, so the height of the liquid in the barrel body 44 can best reflect the angle of inclination of the fuselage 2, so through the liquid The level detection electrode detects the change of liquid level in the barrel, and then determines whether the machine body is in a flat state. It can not only detect whether there is dirty liquid in the barrel, but also determine the height and amount of the dirty liquid according to the liquid level signal, and then accurately determine the inclination angle of the machine body and whether it is in a flat cleaning working state, and match reasonable working parameters for the flat working state of the machine body, such as water supply, speed of the cleaning component and suction power of the suction motor. The main control unit determines the inclination angle of the machine body according to the liquid level signal and then controls the surface cleaning device to work with reasonable working parameters, so that it can clean efficiently and be in a safe working environment without being contaminated or even damaged by dirty liquid. There will not be a problem that although the machine body is in a flat cleaning working state, there is no sewage or less sewage in the sewage bucket, and the main control unit controls the sewage suction motor to reduce the sewage suction power only according to the flat cleaning working signal of the machine body detected by the angle sensor, or the main control unit controls the water supply system to reduce the water supply to the cleaning component or the surface to be cleaned, thereby greatly reducing the sewage suction efficiency. After the customer has used the surface cleaning device for cleaning for a period of time, when there is a lot of sewage in the barrel, the customer wants to continue cleaning the floor of a low space, such as the floor under the bed, and because there is a lot of sewage but it is not full at this time, the customer adjusts the machine body to a flat position. During the lying working state, when the angle threshold set by the angle sensor has not been reached or the machine is completely lying flat, the dirty liquid flows upward along the barrel wall as the tilt angle of the machine body increases. The liquid level detection electrode can immediately detect a signal of a large amount of dirty liquid. The main control unit determines that the machine body is in the lying cleaning working state, thereby controlling the surface cleaning device to change the working parameters of the water supply system, the sewage suction system, etc., avoiding the possibility of the dirty liquid being sucked to the upper port of the barrel body and then entering the machine body to contaminate the sewage suction motor. In addition, the surface cleaning device works with more reasonable working parameters. The control method of this technical solution makes the operation of the surface cleaning device more accurate, flexible and intelligent.

[0053] The liquid level detection electrode described in the present invention is a metal sheet disposed on the rear sidewall of the sewage bucket. It is understood that a metal rod disposed near the rear sidewall, a capacitive electrode disposed on the rear sidewall, or other electrodes or sensors capable of detecting liquid level could also be used. Those skilled in the art, based on the concepts of the present invention, could select different liquid level sensors and dispose them at different locations in the sewage bucket to achieve the present invention's objective of determining whether the device is lying flat based on the water level signal, and all such determinations fall within the scope of the present invention.

[0054] Below we provide a detailed description with specific implementation methods.

[0055] Example 1:

[0056] As the surface cleaning device of the present invention, Figures 1 to 14 As shown, it includes a main control unit 8, a body 2, a floor brush 5 and a liquid level detection circuit 7. The liquid level detection circuit 7 is connected to the main control unit 8. The body 2 is provided with a clean water tank 3, a sewage bucket assembly 4 and a sewage suction motor (not shown in the figure). The lower part of the body 2 and the rear part of the floor brush 5 are pivotally connected. The floor brush is provided with a water supply port (not shown in the figure) connected to the clean water tank, a scraper (not shown in the figure) and a cleaning member (not shown in the figure). The upper end of the body 2 of the surface cleaning device is provided with a handle 1, the sewage bucket assembly 4 is installed on the front side of the body 2, and the clean water tank 3 is provided on the rear side of the body. The body has two working states, namely Figure 1 The tilt working state shown and Figure 2 In the illustrated horizontal working position, the sewage bucket assembly includes a barrel body 44 having an inner cavity 45 and a top cover 41. A sewage inlet pipe 48 is disposed within the barrel body 44. The barrel body 44 has a left side wall (not shown), a right side wall (not shown), a front side wall 444, and a rear side wall 443. The sewage inlet pipe 48 is disposed near the rear side wall 443 of the barrel body 44. The upper end of the barrel body 44 is open, and a top cover 41 is removably mounted at the upper end. The top cover 41 snaps onto the upper end of the barrel body 44 to seal the upper end of the barrel body 44. The liquid level detection electrode includes a first electrode 410 disposed at the bottom of the barrel body 44 and a second electrode 49 disposed near the rear side wall 443 of the barrel body 44. In this embodiment, the detection end 491 of the second electrode 49 is located in the middle of the barrel body along the height direction. The second electrode 49 is disposed on the rear side wall 443 of the barrel body 44. The second electrode 49 extends along the height direction of the barrel body 44 and is perpendicular to the extension direction of the first electrode 410. At this time, the extension direction of the second electrode 49 is parallel to the rear side wall of the barrel 44, and the extension direction of the first electrode 410 is parallel to the bottom wall of the barrel 44. In this embodiment, the second electrode 49 comprises a metal sheet, such as Figure 5As shown, the metal sheet is embedded in the rear side wall of the barrel body, and an opening is provided in the middle of the rear side wall of the barrel body. The detection end 491 is exposed at the opening of the rear side wall, and the detection end 491 extends into the opening and is flush with the wall surface of the rear side wall 443. The first electrode 410 is provided on the bottom wall 442 of the barrel body 44, and the first electrode 410 is also a metal sheet. The metal sheet is embedded in the bottom wall 442 of the barrel body, and an opening is provided on the bottom wall 442 of the barrel body 44. The sensing end 4101 is exposed at the opening of the bottom wall, and the sensing end 4101 extends into the opening and is flush with the inner wall surface of the bottom wall 442. The body has a tilted working state and a flat working state, respectively. Figure 1 and Figure 2 As shown, it also includes a liquid level detection circuit 7 connected to the main control unit 8, the liquid level detection circuit 7 is electrically connected to the second electrode 49 and the first electrode 410 respectively, the second electrode 49 obtains the liquid level signal in the sewage bucket, and the liquid level signal includes a liquid-free trigger signal and a liquid-containing trigger signal; the surface cleaning device starts the cleaning operation, and when the sewage is sucked out, the main control unit controls the sewage suction motor to work at the first sewage suction power according to the liquid-free trigger signal, and the air flow in the barrel body 44 is sucked into the body, so that a negative pressure is generated in the barrel body 44, and the sewage is sucked into the barrel body 44, when the dirty liquid in the barrel body 44 rises to contact the detection end 491 of the second electrode 49, the liquid level detection circuit 7 is turned on and sends a liquid trigger signal. The main control unit 8 determines that the fuselage is in a flat working state based on the liquid trigger signal, and controls and adjusts the sewage suction motor to reduce the first sewage suction power to the second sewage suction power, or reduces the current working speed of the sewage suction motor to reduce the suction force on the dirty liquid, thereby reducing the height of the dirty liquid rising, and preventing the dirty liquid from rising to the upper port of the barrel body and then entering the fuselage to contaminate the motor.

[0057] The top cover 41 includes an upper cover body 414 and a lower cover body 415. Figure 5As shown, the upper cover body 414 is buckled on the lower cover body 415 to form a accommodating chamber 416 with an upper opening. The upper opening is provided at the top of the upper cover body 414. A gas-liquid separation structure is provided in the accommodating chamber 416, such as a HEPA. The accommodating chamber 416 is provided with an exhaust port 412 which is connected to the inner chamber 45 of the barrel body 44. In this embodiment, the exhaust port 412 is provided at the intersection of the bottom wall and the side wall of the lower cover body 416. The lower accommodating chamber in the top cover 41 forms an exhaust channel (not shown in the figure) that runs through the top cover itself. The top cover 41 is sealed and connected to the barrel body 44 to form a sewage bucket assembly 4, which can be disassembled and assembled on the fuselage 2 as a whole. The sewage bucket is installed on the fuselage, and the upper end opening of the accommodating cavity 416 is docked and connected with the air flow channel on the fuselage 2. The air flow channel is connected with the air flow channel of the sewage suction motor in the fuselage, and the air flow channel of the sewage suction motor is connected with the exhaust port on the fuselage. The exhaust port on the fuselage is arranged between the sewage bucket and the fuselage. The sewage suction motor adopts a vacuum motor. When the sewage suction motor works, the gas in the sewage bucket is sucked into the fuselage, and flows through the air flow channel of the sewage suction motor and is discharged to the exhaust port on the fuselage. The exhaust port corresponds to the gap between the sewage bucket and the fuselage, so that the air flow is discharged downward from the gap between the fuselage and the sewage bucket to the outside of the fuselage.

[0058] During use, the operator changes the movement direction of the floor brush 5 by holding the handle 1, thereby moving the floor brush 5 within the working area. A cleaning roller or a cleaning cloth or other cleaning parts are provided at the bottom of the floor brush 5. The water supply system supplies water to the surface to be cleaned or the cleaning parts, so that the cleaning parts are moistened. The cleaning parts rub against the ground to be cleaned to clean the ground. At the same time, the scraping strips scrape the cleaning parts, and the sewage suction motor works to collect the scraped dirt or dirty liquid into the barrel body of the sewage bucket. In this embodiment, the cleaning part adopts a single roller mode including a cleaning roller, and the cleaning roller includes a roller and a cleaning cloth arranged outside the roller, and the cleaning cloth is provided with tufts of hair. Figure 5 As shown, the top cover 41 is further provided with a liquid full detection electrode 42, which extends downward from the top cover 41, and its extension direction is perpendicular to the first electrode 410, that is, the liquid full detection electrode 42 is arranged in parallel with the second electrode 49, and also includes a liquid full detection circuit 9, as shown Figure 15The liquid full detection electrode 42 includes a sensing surface 421 exposed in the barrel body 44. The liquid full detection electrode 42 extends along the height direction of the sewage barrel. The liquid full detection electrode 42 and the first electrode 410 are respectively electrically connected to the liquid full detection circuit 9. When the dirty liquid in the barrel body 44 rises to contact the sensing surface 421 of the liquid full detection electrode 42, the liquid full detection circuit 9 is turned on and sends a liquid full signal. The liquid full detection circuit 9 feeds back the liquid full signal to the main control unit 8, and the main control unit 8 controls the sewage suction motor to stop working. The liquid full detection electrode is a metal rod with an insulating material outer shell. The tail end of the metal rod is exposed from under the insulating material to form the sensing surface of the liquid full detection electrode. The contour line of the sensing surface of the liquid full detection electrode is the third contour line 433. At the same time, the third contour line is also the highest marking line of the liquid level of the sewage stored in the sewage bucket. The contour line of the detection end 491 of the second electrode 49 is the second contour line 423. In this embodiment, the insulating material is a plastic sleeve extending downward from the lower cover body 415 of the top cover 41, that is, the insulating material and the lower cover body 415 of the top cover 41 are integrally formed. The detection end of the liquid full detection electrode is also arranged in the middle position in the height direction of the barrel body, and the detection end of the liquid full detection motor is located near the second contour line 423 of the detection end 491 of the second electrode 49, but above the second contour line 423. This reserves sufficient space for the collected sewage to shake, so as to ensure that the barrel body of the sewage bucket is full of liquid. When the customer pushes and pulls the machine body back and forth, causing the liquid surface to shake, the dirty liquid will not splash into the exhaust port 412. When the dirty liquid climbs to the detection end 491 of the second electrode 49 and has not yet reached the detection end of the liquid full detection electrode, the dirty liquid connects the second electrode 49 and the first electrode 410, so that the liquid level detection circuit 7 forms a loop conduction and feeds back the liquid level signal to the main control unit 8. The main control unit 8 controls the sewage suction motor to operate at a power lower than the current power or at a speed lower than the current speed. Since the detection end of the second electrode is lower than the detection end of the liquid full detection electrode, there is sufficient space reserved in the barrel body of the sewage barrel for the dirty liquid to shake or splash. At this time, the suction power or speed of the sewage suction motor is reduced, so the suction force on the sewage is reduced. Therefore, the height of the sewage rising at this time is small, thereby ensuring a safe distance between the exhaust port and the moving sewage. Therefore, the operating environment of the sewage suction motor is guaranteed.

[0059] In this embodiment, the floor brush 5 has forward and backward directions, and the floor brush 5 is provided with running wheels, which are connected to the floor brush 5 through a rotating shaft. The height direction of the fuselage 2 is perpendicular to the axial direction of the running wheels. The front and rear directions of the fuselage 2 are perpendicular to the height direction of the fuselage 2 and the axial direction of the running wheels. The left and right directions of the fuselage 2 and the barrel 44 are perpendicular to the axial direction of the running wheels in the floor brush 5. The dimension of the barrel 44 in the front and rear directions is defined as thickness, and the dimension of the barrel 44 in the left and right directions is defined as width. In this embodiment, the side wall of the barrel 44 close to the nearest end of the floor brush 5 in the height direction is defined as the bottom wall, and the side walls of the barrel 44 on the front and rear sides are defined as the rear side wall and the front side wall.

[0060] In order to further ensure the accuracy of the liquid level detection electrode detection, we can also set an angle sensor or position sensor on the fuselage or sewage bucket assembly, and set a preset angle threshold α0 corresponding to the fuselage being in a tilted working state and a flat working state on the control unit. When α>α0, the fuselage is in a tilted working state, and the working power of the sewage suction motor is P1. When α≤α0, the fuselage is in a flat working state, and the working power of the sewage suction motor is P2. Among them, α0 satisfies 20°≤α0≤30°, P1≥P2, so that there is sewage in the barrel body. And when the angle between the machine body and the surface to be cleaned is 30° or 20°, the dirty liquid can conduct the first electrode and the detection end of the liquid level detection motor, so that the liquid level detection circuit is triggered, and the main control unit controls the sewage suction motor to reduce the power or speed, reserving sufficient space for the operation of the dirty liquid, and avoiding the sewage suction motor from being contaminated when the machine body is in a flat working state. At the same time, when the angle between the machine body and the surface to be cleaned is large or there is less sewage in the barrel, the sewage suction motor can operate normally at full power, thereby ensuring the treatment of heavy dirt and the treatment of dirt in low spaces. The surface cleaning device is more intelligent and flexible to use. When the angle between the machine body and the surface to be cleaned is greater than or equal to 90°, it is considered that the machine body is in an upright, stationary standby state, such as Figure 3 As shown, in this embodiment, the preset angle threshold α0 set in the main control unit is 30°, that is, when we set the angle α between the body 2 and the surface to be cleaned to be between 30° and 90°, as shown in FIG. Figure 1 As shown, we assume that the body of the surface cleaning device is in an inclined working state; when the angle between the body 2 and the surface to be cleaned is less than or equal to 30 degrees and greater than or equal to 0 degrees, as shown in FIG. Figure 2 As shown, the body of the surface cleaning device is considered to be in a flat working state, that is, when the angles between the body and the surface to be cleaned are 30°, 22°, 11° and 0°, respectively, then the angles between the sewage bucket assembly 4 and the surface to be cleaned are 30°, 22°, 11° and 0°, respectively. Figures 7 to 10 As shown, the body is in a flat working state at this time. In this embodiment, the angle between the body 2 and the surface to be cleaned is α, α = 60°, as shown in FIG. Figure 1As shown, the body of the surface cleaning device is in a tilted working state at this time, and the tilt angle between the sewage bucket and the surface to be cleaned is also 60°. Figure 6 When the angle α between the body 2 and the surface to be cleaned is 22°, Figure 2 As shown, the surface cleaning device is in a flat working state at this time, and the inclination angle between the sewage bucket and the surface to be cleaned is also 22°. Figure 8 shown.

[0061] In this embodiment, along the height direction of the barrel body 44, the front and rear thickness of the inner cavity 45 of the barrel body 44 is b, the distance from the detection end 491 of the second electrode 49 to the first electrode 410 is h, and 1.5b≤h<2b. So that the sewage bucket is converted from the tilted working state to the flat working state as the body of the machine body, and the dirty liquid in the barrel body rises to the detection end of the second electrode, the liquid level detection circuit 7 is turned on and sends a liquid level state change signal to the main control unit, and the main control unit controls to reduce the current working power or current working speed of the sewage suction motor. In this setting, since the distance h between the detection end 491 of the second electrode 49 and the first electrode 410 is less than 2b and not less than 1.5b, as Figures 5 to 10As shown, since the width of the bottom wall of the barrel body 44 is the thickness of the front and back of the barrel body 44, the width of the bottom wall is b, the intersection of the front side wall and the bottom wall of the barrel body is A, and the intersection of the rear side wall 443 and the bottom wall 442 of the barrel body 44 is B. Then the length of AB is the width of the bottom wall of the barrel body, so the length of AB is equal to b. Since the first electrode extends from the front side wall to the rear side wall of the barrel body, the intersection A of the front side wall and the bottom wall of the barrel body is the highest point of the first electrode, and the contour line of point A intersects with the rear side wall at point C. If the machine body is in a tilted working state, for example, when the machine body is in a tilted working state, the angle between the machine body and the surface to be cleaned is 60 degrees. Since the rear side wall of the barrel body is either set close to the machine body or the sewage bucket is set at the rear of the machine body, that is, the rear side wall of the sewage bucket is parallel to or coincides with the machine body, the angle between the rear side wall of the sewage bucket and the surface to be cleaned is 60 degrees, and the angle between the bottom wall of the barrel body and the surface to be cleaned is 30 degrees. At this time, dirty liquid is pumped into the barrel body. Generally, in the prior art, the detection end of the second electrode of the sewage bucket is set at 1 / 2 of the height of the sewage bucket, that is, the height of the barrel body is generally 3b or above. In this embodiment, the height of the barrel body is 4b. Assuming that the sewage The liquid rises to point A. Since the liquid surface is always horizontal, and the intersection C of the contour line of point A and the rear side wall, that is, the liquid surface of the dirty liquid in the barrel body extends along the rear side wall to point C, then the width of the liquid surface, that is, the length of side AC, is b / cos30°=1.15b, and the distance BC that the liquid surface climbs along the rear side wall is ctg30°*b=0.58b. Therefore, the sewage in the barrel body has not yet reached the detection end of the liquid level electrode, and the dirty liquid is far away from the exhaust port. There is enough space in the sewage barrel to store the dirty liquid. Therefore, the main control unit does not need to adjust the power or speed of the sewage suction motor. The surface cleaning device can still keep the sewage suction motor in an efficient operating state and fully suck out the sewage.

[0062] When the angle between the machine body and the surface to be cleaned is 60°, the machine body is in a tilted working state, that is, when the angle between the sewage bucket and the surface to be cleaned is 60°, Figure 6As shown, when the surface cleaning device is performing cleaning work, the sewage suction motor is working, the current working power of the sewage suction motor is P1, the current working speed is N1, and the sewage is sucked into the barrel body 44 from the sewage inlet pipe 48. It first contacts the sensing end 4101 of the first electrode 410 on the bottom wall of the barrel body 44. Affected by gravity, the sewage liquid level 411 is approximately a horizontal plane, and the sewage liquid level 411 gradually climbs upward from the bottom wall along the rear side wall of the barrel body 44. At this time, the plane where the detection end 491 of the second electrode 49 is located is the liquid level detection surface, the intersection of the front side wall and the bottom wall of the barrel body is A, and the intersection of the rear side wall 443 and the bottom wall 442 of the barrel body 44 is B. Then the length of AB is the width of the bottom wall of the barrel body, so the length of AB is equal to b. Since the first electrode extends from the front side wall to the rear side wall of the barrel body, the intersection of the front side wall and the bottom wall of the barrel body is Point A is the highest point of the first electrode, and the contour line of point A intersects point C with the rear side wall. The first contour line 413 is the contour line of the sensing end 4101 of the first electrode 410, and the second contour line 423 is the contour line of the detection end of the second electrode. When the sewage liquid level rises to the sensing end 4101 of the first electrode 410, that is, the first contour line 413, the sewage liquid level has not reached the detection end of the second electrode 49, that is, has not reached the second contour line 423, the liquid level detection circuit is not conductive, and the main control unit controls the sewage suction motor to still work at the current working power P1. At this time, the sewage suction motor and the exhaust port 412 are at a higher position, and the sewage liquid level is far away from the exhaust port 412. Such a large space is sufficient for storing the sewage liquid level. Under the action of the sewage suction motor, there is sufficient upward space for the sewage liquid level. Therefore, the operating environment of the sewage suction motor is safe. The surface cleaning device continues to work, continues to clean and collect the sewage. When the sewage level rises to the detection end 491 of the second electrode 49, that is, when it rises to the second contour line 423, the sewage connects the detection end 491 and the sensing end 4101. At this time, the liquid level detection circuit 7 forms a loop and feeds back the liquid level signal to the main control unit. The main control unit controls the sewage suction motor to reduce the power. The working power of the sewage suction motor is P2, where P1>P2, for example, P2=0.5P1. Therefore, the suction force of the sewage suction motor becomes smaller, and the suction force of the sewage suction motor decreases. Figure 6 It can be seen that at this time, the distance between the sewage liquid level and the exhaust port is relatively close, but it has not yet reached the third contour line 433 of the sensing surface 421 of the liquid full detection electrode 42, which reserves a large safe operating distance for the sewage. Moreover, the power or speed of the sewage suction motor has been reduced at this time. Therefore, the sewage suction work can still continue until it reaches the sensing surface 421 of the liquid full detection electrode 42, that is, the third contour line 433, thereby ensuring that the surface cleaning device can always work normally when the body is in a tilted working state, and the sewage will not flow to the exhaust port, ensuring that the sewage suction motor is always in a safe environment and will not be contaminated when the body is in a tilted working state. The operation of the surface cleaning device is more intelligent and the control is more flexible.

[0063] When the surface cleaning device is performing cleaning work, the sewage suction motor is working, and sewage is sucked into the barrel body 44 from the sewage inlet pipe 48, and first contacts the sensing end 4101 of the first electrode 410 on the bottom wall of the barrel body 44. Affected by gravity, the sewage liquid level 411 is approximately a horizontal plane, and the sewage liquid level 411 gradually climbs upward from the bottom wall along the rear side wall of the barrel body 44. When the angle between the fuselage body and the surface to be cleaned is less than or equal to 30° and greater than 10°, that is, when the angles between the fuselage body and the surface to be cleaned are 30°, 22°, and 11° respectively, that is, when the angles between the sewage bucket assembly 4 and the surface to be cleaned are 30°, 22°, and 11° respectively, as shown in FIG. Figures 7 to 9 As shown, the distance between the bottom wall of the barrel and the detection end of the second electrode is h = 1.7b. The height of the detection end of the second electrode is higher than the height of the sensing end 4101 of the first electrode 410. Therefore, the plane where the detection end 491 of the second electrode 49 is located is the detection surface, that is, Figures 7 to 9 The contour line 413 corresponding to the detection end 491 of the second electrode 49 is the detection surface. In this embodiment, the sensing end 4101 of the first electrode 410 is set at a distance of 0.25b from the rear side wall. Figure 9 As shown, when the angle between the sewage bucket assembly and the surface to be cleaned is 11°, we can see that the first contour line 413 and the second contour line 423 are very close. At that time, the second contour line is still higher than the first contour line, that is, at this time, the sensing end 4101 of the first electrode 410 and the detection end 491 of the second electrode 49 are at nearly the same height. When the amount of dirty liquid sucked into the sewage bucket just reaches the second contour line 423, the dirty liquid has also reached the sensing end 4101 of the first electrode, so at this time, the second contour line 423 is still the detection surface, that is, the detection end 491 of the second electrode 49 is still the detection surface. Assume that the customer has finished cleaning the bedroom floor and needs to clean the floor under the bed. Assume that when the customer cleans the bedroom floor, the body of the machine is at an angle of 60° with the surface to be cleaned. At this time, the customer adjusts the angle between the body and the surface to be cleaned to 30°. At this time, the customer adjusts the body from the tilted working state to the flat working state, that is, the angle between the sewage bucket assembly and the surface to be cleaned is 30°. Figure 7 As shown, the sewage bucket assembly is in the first state at this time. Assuming that the sewage liquid level has reached the detection end 491 of the second electrode 49 when the body 2 is in the tilted working state, as shown in FIG. Figure 6 As shown, if the body 2 is adjusted to a flat working state at this time, that is, the angle between the sewage bucket assembly and the surface to be cleaned is 30°, as shown in FIG. Figure 7As shown, the detection end 491 of the second electrode 49 also decreases as the inclination angle of the machine body decreases, that is, the second contour line 423 decreases. At the same time, the sensing surface 421 of the liquid full detection electrode 42 also decreases as the machine body tilts, that is, its third contour line also decreases. We assume that the sewage suction motor is not working at this time. Since the volume of the sewage remains unchanged, the height of the sewage liquid level of the same volume decreases as the angle between the machine body and the surface to be cleaned decreases, and the area of ​​the sewage liquid surface increases, so that the sewage liquid level passes over the detection end 491 of the second electrode 49 and climbs up along the rear side wall. The sewage level will rise and spread to the area between the front and side walls. Calculated based on the constant volume, the sewage level will rise to the point where it just crosses the sensing surface of the liquid-full detection electrode, which is the third contour line. The liquid-full detection electrode and the first electrode are connected by the sewage. The liquid-full detection circuit 9 forms a loop and transmits a liquid-full signal to the main control unit 8. The main control unit 8 then controls the sewage suction motor to stop working and issues a liquid-full alarm. The customer can then pour out the sewage liquid in the sewage bucket. This avoids the possibility of the sewage suction motor being contaminated by lying flat when the sewage is full. Assuming that the machine body is in an inclined working state with an angle of 60° to the surface to be cleaned, the sewage is less and has not reached the detection end 491 of the second electrode 49. When the customer adjusts the machine body to a flat working state with an angle of 30° to the surface to be cleaned, the amount of sewage stored is such that when the sewage bucket assembly is adjusted to an angle of 30° with the surface to be cleaned, the sewage just reaches the detection end 491 of the second electrode 49. Figure 7 As shown, the dirty liquid connects the first electrode and the second electrode, and the liquid level detection circuit forms a loop conduction, sending a liquid level signal to the main control unit, which controls the sewage suction motor to adjust the working power to P2, wherein P1>P2, for example, P2=0.5P1. We can see that although the liquid level has not yet reached the sensing surface 421 of the liquid full detection electrode 42, since the distance between the sensing surface 421 of the liquid full detection electrode 42 and the detection end of the second electrode remains unchanged, the detection end of the second electrode and the sensing surface of the liquid full detection electrode gradually decrease as the fuselage tilts, so the liquid level gradually approaches the exhaust port. However, at this time, the suction power of the sewage suction motor is reduced to P2. Therefore, the suction force of the sewage suction motor becomes smaller, and the suction power of the sewage suction motor is reduced. Figure 7It can be seen that at this time, the distance between the sewage liquid level and the exhaust port is relatively close, but it has not yet reached the third contour line 433 of the sensing surface 421 of the liquid full detection electrode 42, which reserves a large safe operating distance for the sewage. Moreover, the power of the sewage suction motor has been reduced at this time. Therefore, the sewage suction work can still continue until it reaches the sensing surface 421 of the liquid full detection electrode 42, that is, the third contour line 433, thereby ensuring that the surface cleaning device can always work normally when the body is in a tilted working state, and the sewage will not flow to the exhaust port, ensuring that the sewage suction motor is always in a safe environment and will not be contaminated when the body is in a tilted working state. Assume that when the customer adjusts the angle between the machine body and the surface to be cleaned from the inclined working state of 60° to the flat working state of 30°, the dirty liquid has not yet reached the detection end 491 of the second electrode 49, that is, when the dirty liquid is less, the sewage suction motor still works at the current working power P1 or the current working speed N1, and the dirty liquid continues to be sucked into the barrel body of the sewage barrel. The liquid level of the dirty liquid rises to point A. Since we set the distance between the detection end of the liquid level electrode and the first electrode to h, that is, the distance between the bottom wall of the barrel body and the second electrode The distance between the detection end and the detection end is h. Since h is less than 2b and not less than 1.5b, in this embodiment, h=1.7b, that is, the distance between the detection end 491 of the second electrode 49 and point B is 1.7b. Due to the nature of the liquid, the height of the liquid level is basically the same. As the angle between the body and the surface to be cleaned decreases to 30°, the detection end 491 of the second electrode 49 is lowered. At this time, the liquid level of the dirty liquid in the barrel extends upward along the rear side wall to point D. The width of the liquid level is AD, and the length of AD is b / cos60°=2b, the distance BD that the liquid level climbs along the rear side wall is 1.732b, which is greater than the distance from the detection end 491 to point B. Therefore, when the dirty liquid rises to point A, it has also reached the detection end 491 of the second electrode 49. Therefore, the liquid level detection circuit is turned on, and the main control unit controls the sewage suction motor to start reducing the power, adjusting the power of the sewage suction motor to P2, reducing the suction force for the dirty liquid, and reducing the distance the dirty liquid rises, thereby reserving more space for the dirty liquid storage and avoiding the problem of dirty liquid. As the tilt angle of the body decreases further, the height of the liquid decreases, thereby reaching the detection end 491 of the second electrode 49 more quickly, reserving sufficient space for the storage and upwelling of the dirty liquid, avoiding the possibility of it contaminating the motor through the exhaust port. At the same time, when the angle between the body and the surface to be cleaned is less than 30°, the dirty liquid connects the second electrode 49 and the first electrode 410, thereby turning on the liquid level detection circuit 7 and sending a signal. The main control unit can control the reduction of the power or speed of the dirt suction electrode to avoid contamination of the dirt suction motor.When the customer needs to clean a low space, the customer adjusts the angle between the machine body and the surface to be cleaned to 30°, that is, the angle between the bottom wall of the barrel and the surface to be cleaned is 60°, and we set the detection end 491 of the second electrode 49 at 2b and above. Although more dirty liquid can be stored when the machine body is in a tilted working state, the dirty liquid can only reach the detection end 491 of the second electrode 49 when the machine body is close to parallel with the surface to be cleaned, that is, when the machine body is close to completely lying flat. If there is already a lot of dirty liquid in the original sewage barrel, it is too late to reduce the power of the sewage suction motor at this time. The sewage will flow directly to the exhaust port and enter the sewage suction motor, which is still unsafe. When we set h to be less than 1.5b, the angle between the bottom wall of the barrel and the surface to be cleaned is not yet 60°, that is, the angle between the body and the surface to be cleaned is not yet 30°, the liquid level has already passed the detection end 491 of the second electrode 49. Although the pollution problem of the sewage suction motor is avoided, the amount of sewage stored in the sewage bucket is greatly reduced, and the main control unit quickly reduces the power of the sewage suction motor. The cleaning effect of low spaces with heavy dirt will be greatly reduced. If the power of the sewage suction motor is not changed, the liquid full alarm will be issued soon, which will not provide a good experience for customers. This solution can make the liquid level detection circuit turn on and send out a liquid level signal by tilting the body downward to an angle of less than or equal to 30 degrees with the ground to be cleaned after the volume of sewage in the sewage bucket is greater than the set value, thereby facilitating the main control unit to control the sewage suction electrode to reduce the power. At the same time, h < 2b, which can avoid the situation where the sewage liquid level can only contact the liquid level electrode when there is too much sewage in the sewage bucket. When the volume a of the sewage within the barrel 44 is such that the sewage level 411 just covers the upper end of the bottom wall of the barrel 44 when the barrel 44 is tilted 30 degrees, the angle between the sewage level 411 and the rear wall of the barrel 44 is 30 degrees. The distance between the end of the sewage level 411 contacting the rear wall of the barrel 44 and the bottom wall of the barrel 44 is h, where h = b * cot30, i.e., h is approximately equal to 1.73b. Furthermore, the distance h between the detection end of the second electrode and the first electrode satisfies 1.5b ≤ h < 2b, and the angle between the barrel 44 and the surface to be cleaned is no greater than 30 degrees, the liquid level detection circuit 7 is triggered, thereby obtaining a signal indicating that the sewage level has reached the detection end 491 of the second electrode 49. When the volume of sewage in the barrel body 44 needs to be adjusted to be larger so that it can be triggered when the sewage barrel is tilted at a 30-degree angle, the value of h needs to be increased, but it should not be increased too much. h needs to be less than 2b to avoid the sewage liquid level 411 being too close to the exhaust port when it contacts the detection end 491 of the second electrode 49, thereby reducing the probability of sewage shaking and splashing and being sucked into the exhaust port.

[0064] When the sewage in the barrel 44 increases or the angle between the barrel 44 and the ground becomes smaller or even enters the flat working state, Figure 10As shown, the sewage liquid level 411 rises relative to the detection surface, and the distance between the sewage liquid level 411 and the detection surface gradually becomes smaller, and even the sewage liquid level 411 is higher than the detection surface. After the sewage in the barrel body 44 immerses the detection end 491 of the second electrode 49 and the sensing end 4101 of the first electrode 410 respectively, the second electrode 49 and the first electrode 410 are connected by the sewage, and then a current loop is formed between the liquid level detection circuit 7, the second electrode 49 and the first electrode 410. The signal detected by the liquid level detection circuit 7 that the second electrode 49 and the first electrode 410 are connected represents that the sewage liquid level 411 has risen to contact with the detection surface where the detection end 491 of the second electrode 49 is located. Specifically, as Figure 7 As shown, the body is in a flat state, and the angle between the body and the surface to be cleaned is 30 degrees, and the angle between the sewage bucket assembly 4 and the surface to be cleaned is also 30 degrees, the height of the sewage liquid level can connect the second electrode 49 and the first electrode 410; Figure 7 As shown, when the angle between the sewage bucket assembly 4 and the surface to be cleaned is 22 degrees, the height of the sewage liquid level can connect the second electrode 49 and the first electrode 410. When the sewage liquid level 411 contacts the detection end 491 of the second electrode 49, no matter whether the sewage bucket assembly 4 and the surface to be cleaned are at the same angle, the sewage level 411 can connect the second electrode 49 and the first electrode 410. Figure 6 30 degrees or Figure 7 At 22 degrees, the minimum distance between the sewage level 411 and the exhaust port is a constant value (i.e., the length of the line connecting the center of the exhaust port 412 and the detection end 491 of the second electrode 49). The liquid level detection circuit 7 issues a power reduction command to the sewage suction motor after the sewage level 411 conducts electricity between the second electrode 49 and the first electrode 410. This can comprehensively consider the volume of sewage in the barrel 44 and the tilt angle of the barrel 44, making the timing of power reduction of the sewage suction motor more reasonable.

[0065] In this embodiment, the first electrode 410 extends from the front side wall of the barrel body 44 to the rear side wall of the barrel body 44. One end of the first electrode 410 connected to the front side wall of the barrel body 44 is tilted upward, and the other end is tilted toward the rear side wall and extends downward. Figures 5 to 10 As shown, the length of the first electrode 410 is c, the front and rear thickness of the inner cavity 45 of the barrel body 44 is b, and b / 2≤c≤b. The sensing end 4101 of the first electrode 410 is set at a distance of 0.25b from the rear side wall, that is, the length of the first electrode 410 is c=0.75b. When the angle between the sewage tank and the surface to be cleaned is large, the fuselage is in an inclined working state at this time, and the angle between the sewage tank and the surface to be cleaned is 60°. The volume of sewage is not enough to rise to contact the detection end 491 of the first electrode 410 and the second electrode 49, that is, when there is very little sewage in the barrel body 44, the first electrode 410 and the second electrode 49 will not be connected by sewage, and the liquid level detection circuit will not form a loop, and the power reduction of the sewage suction motor caused by the conduction between the second electrode 49 and the first electrode 410 will not occur. From Figure 9 and Figure 10 It can be seen that when the angle between the sewage bucket assembly and the surface to be cleaned continues to decrease from 10°, the height of the sensing end 4101 of the first electrode 410 will be higher than the height of the detection end 491 of the second electrode 49. For the liquid level detection circuit, the first contour line 413 of the sensing end 4101 of the first electrode 410 is the detection surface. Even if the angle between the sewage bucket and the surface to be cleaned is reduced to below 10°, see Figure 9 , since the sensing end 4101 of the first electrode 410 rises and the height of the detection end 491 of the second electrode 49 drops, at this time, if the volume of sewage in the barrel body 44 is small enough, so that the sewage cannot immerse the sensing end 4101, and the second electrode 49 and the first electrode 410 cannot be connected by the sewage, then the liquid level detection circuit 7 will not detect the corresponding signal, and will not control the power reduction of the sewage suction motor. The sewage suction motor still works at the current working power P1, and the sewage suction work can still operate efficiently. At this time, the safe distance between the sewage and the exhaust port is large, so the sewage will not Enters the exhaust port, and when the dirty liquid rises to the sensing end 4101 of the first electrode, the liquid level detection circuit is turned on to form a loop. The main control unit receives the liquid level signal and controls the sewage suction motor to start reducing the power. The power of the sewage suction motor is adjusted to P2, which reduces the suction force on the dirty liquid. The rising distance of the dirty liquid is reduced, thereby reserving more space for the storage of the dirty liquid, avoiding the height of the dirty liquid decreasing as the inclination angle of the fuselage further decreases, thereby reaching the detection end of the liquid level motor more quickly, reserving sufficient space for the storage and upwelling of the dirty liquid, and avoiding the problem of contaminating the sewage suction motor.

[0066] In this embodiment, the first electrode 410 includes a sensing end 4101. The first electrode is provided on the bottom wall of the barrel body and its sensing end is at least partially exposed on the bottom wall of the barrel body, so that the dirty liquid in the barrel body contacts the sensing end when the sewage suction motor is working. The first electrode extends from the front side wall of the barrel body to the rear side wall of the barrel body, and the sensing end is located in the area between the rear side wall and the central axis of the sewage bucket. There are multiple first electrodes 410, and the extension directions of the multiple first electrodes 410 are parallel. This arrangement facilitates the use of multiple first electrodes 410 to simultaneously cooperate with the second electrode 49 for dirt detection, thereby facilitating the improvement of the detection accuracy of the liquid level detection circuit 7. Specifically, there are two first electrodes 410, such as Figure 11 and Figure 12 As shown, the two first electrodes 410 are symmetrically arranged about the center plane of the barrel body 44 where the sewage inlet pipe 48 is located. In this embodiment, the first electrode 410 has multiple sensing ends 4101, and the distance between at least one sensing end 4101 and the rear side wall of the barrel body 44 is less than half and greater than one-quarter of the thickness of the barrel body 44, so that the obtained liquid level signal is more accurate. In order to ensure the accuracy and reliability of the detection signal, we have three sensing ends 4101 in a single first electrode 410, see Figure 12One sensing end 4101 is located at the center of the first electrode 410 along its length, and the other two sensing ends 4101 are located at either end of the first electrode 410 along its length. In this embodiment, at least one sensing end 4101 is positioned at a distance from the rear sidewall of the barrel 44 that is less than half and greater than one-quarter the thickness of the barrel 44. This arrangement ensures that when the first electrode 410 is turned on, the volume of sewage in the barrel 44 does not need to be excessive, but it also does not need to be excessively low, thereby maintaining a balance between the suction efficiency of the suction motor and preventing water ingress.

[0067] Of course, it is understandable that we can also set the preset angle threshold α0 of the main control unit corresponding to the body in the flat working state to 20°, then when the angle between the body and the surface to be cleaned reaches 20° or less, the body is in the flat cleaning state, that is, when the angle α between the sewage bucket assembly and the surface to be cleaned is 20° or less, the body is in the flat working state, such as Figure 9 and Figure 10 As shown; we can also set the second electrode close to the rear side wall of the barrel, that is, the second electrode 49 is set on the top cover 41, extends downward from the top cover 41, and is set in contact with the rear side wall 443 of the barrel 44, and its extension direction is perpendicular to the extension direction of the first electrode; or, the first electrode 410 is set on the front side wall 444 of the barrel and is tightly attached to the bottom wall of the barrel 44, and the first electrode 410 extends from the front side wall 444 to the rear side wall 443 of the barrel 44, so that the sensing end of the first electrode is located on the central axis plane in the front and rear directions of the barrel and the space between the front side wall and the rear side wall; or the first electrode is extended to near the rear side wall; or, we set a strip mounting groove on the upper surface of the bottom wall of the barrel body, and the first electrode is a strip metal sheet, which is installed flat in the mounting groove, and the top surface of the metal sheet is flush with the upper surface of the bottom wall. One end of the metal sheet passes through the front side wall of the barrel body to form a lead end, which leads the signal to be connected to the main control unit, and the top surface of the metal sheet is exposed on the bottom wall to form the sensing end of the first electrode; such technical solutions that do not deviate from the technical concept of the present invention are all within the protection scope of the present invention, and will not be given examples one by one here.

[0068] In this embodiment, the detection end 491 of the second electrode 49 is exposed and disposed in the first mounting groove of the rear side wall of the barrel body 44; the sensing end 4101 of the first electrode 410 is exposed and disposed in the second mounting groove 441 on the bottom wall of the barrel body 44, and the first mounting groove 441 and the second mounting groove 441 are respectively connected to the inner cavity 45 of the barrel body 44. Specifically, in this embodiment, the first mounting groove 441 and the second mounting groove 441 respectively penetrate the inner wall surface of the barrel body 44, and the first mounting groove 441 and the second mounting groove 441 are evenly connected to the inner cavity 45 of the barrel body 44. This arrangement facilitates the connection of the sensing end 4101 of the first electrode 410 and the detection end 491 of the second electrode 49 with the inner cavity 45 of the barrel body 44, preventing the sensing end 4101 and the detection end 491 from being shielded. Specifically, the cross-sectional shape of the sensing end 4101 and the detection end 491 is square or circular, which can be configured by those skilled in the art. The second electrode 49 is an electrode plate (the first electrode plate shown in the figure) embedded in the rear side wall of the barrel body 44. A protrusion is provided on the electrode plate, which is provided in the first mounting groove. The protrusion is the detection end 491 of the second electrode 49. Specifically, the electrode plate in the second electrode 49 is a long strip of metal plate, which is conductive so that it is convenient to judge whether the sewage liquid level 411 has reached the second electrode 49 by the on-off of the current loop. The electrode plate can also be replaced by a metal column, and the cross-section of the metal column is a circular, elliptical or triangular shape. The protrusion also needs to be conductive. Preferably, the protrusion is a metal protrusion structure integrally formed with the metal plate. In some other embodiments, the metal plate and the protrusion can be manufactured separately, and the two can be abutted to achieve conductivity.

[0069] In this embodiment, the first electrode 410 is an electrode plate, and the first electrode 410 is nested in the second mounting groove 441 as a whole, and the end of the electrode plate facing the inner cavity 45 of the barrel body 44 is the sensing end 4101. Alternatively, the first electrode 410 is an electrode plate, and the electrode plate includes a main structure and a protrusion (the second protrusion shown in the figure), the main structure is embedded in the bottom wall of the barrel body 44, and the protrusion is provided in the second mounting groove 441, and the protrusion is the sensing end 4101. The electrode plate in the first electrode 410 is also a long strip of metal plate that can conduct electricity. The electrode plate can also be replaced with a metal column, and its specific setting can refer to the second electrode 49.

[0070] Barrel body 44 is provided with retaining ribs 43, which divide the upper portion of inner cavity 45 of barrel body 44 into a first space at the front and a second space at the rear. Second electrode 49 is provided in the second space. A sewage inlet pipe 48 is provided in the first space. An exhaust port facing the first space is provided at the upper end of barrel body 44. A baffle 461 is provided between sewage inlet pipe 48 and the exhaust port. The projection of the upper end opening of sewage inlet pipe 48 along its own sewage discharge direction falls into baffle 461. Specifically, the extending direction of retaining ribs 43 is parallel to the height direction of barrel body 44, and baffle 461 is provided perpendicular to the height direction of barrel body 44. Figure 4The lower part of the baffle 461 is provided with a side plate 462 perpendicular to itself. The side plate 462, the baffle 43 and the baffle 461 together form a protective cover with an open lower end. The protective cover is mounted on the upper end opening of the sewage inlet pipe 48. Specifically, the sewage inlet pipe 48 is located between the front side wall of the barrel body 44 and the center plane of the barrel body 44 perpendicular to the front and rear directions. Figure 9 When the sewage bucket assembly 4 is completely in a horizontal state, the sewage inlet pipe 48 is above half the height of the sewage bucket inner cavity 45; therefore, the sewage inlet pipe 48 will be higher than the sewage liquid level in most cases, which can prevent the sewage from flowing back from the sewage inlet pipe in the flat working state.

[0071] In this embodiment, the number of liquid-filled electrodes 42 can be two, see Figure 14 , two liquid full electrodes 42 are symmetrically arranged on the left and right sides of the sewage inlet pipe. In this embodiment, the main control unit 8 can receive signals from the liquid level detection circuit 7 and the liquid full detection circuit 9 respectively, and then reduce the power of the sewage suction motor or turn off the sewage suction motor. Figure 13 , which shows a schematic diagram of the electrical connection between the liquid level detection circuit 7 and the liquid fullness detection circuit 9 and the main control unit 8. The main control unit 8 here can be an ARM processor or a PLC controller. Optionally, two, four, or other numbers of sensing terminals 4101 can be provided at the first electrode 410. Optionally, the two first electrodes 410 may not be symmetrical about the center plane of the sewage inlet pipe 48. Optionally, the number of first electrodes 410 in the barrel 44 can also be three or four, which can be determined by a person skilled in the art.

[0072] Of course, it is understandable that when the body is in a flat working state, and the second electrode and the first electrode are connected, and the liquid level detection circuit is turned on to form a loop, the main control unit can also control to reduce the water supply of the water pump or reduce the speed of the cleaning part, that is, the roller brush, and at the same time reduce the power or speed of the sewage suction motor. Such a technical solution can accurately detect the tilted state of the body and the presence of sewage in the sewage bucket, and adjust the working state of the surface cleaning device in time, such as adjusting the water supply of the clean water tank to the cleaning component on the floor brush, adjusting the sewage suction power or working speed of the sewage suction motor, etc., so that the sewage suction motor is not contaminated, ensuring that the operation of the surface cleaning device is always in a better working state, saving resources while working more intelligently, and providing a better customer experience.

[0073] Example 2:

[0074] This embodiment differs from the first embodiment in that the structures of the surge detection electrode and the sewage bucket assembly are different.

[0075] As the surface cleaning device of the present invention, the sewage bucket assembly is installed on the rear side of the machine body, the clean water tank is installed in the floor brush (not shown in the figure), and also includes a surge detection circuit 6 and a surge detection electrode 47, see Figure 15 , and the contour line of the detection end of the surge detection electrode is the fourth contour line 403. The sewage bucket assembly 4 includes a barrel body 44 and a top cover 41. The height of the barrel body 44 is 3.5b. Figure 16 and Figure 17 As shown, a first mounting groove (not shown in the figure) is provided on the side wall of the barrel body 44, and the first mounting groove extends from the upper end of the barrel body to 1.5b away from the bottom wall of the barrel body. The second electrode 49 is inserted into the first mounting groove, and the upper end of the second electrode 49 extends upward from the upper end of the barrel body 44. The lower cover body is provided with a corresponding socket (not shown in the figure), and the upper end of the second electrode passes through the socket and extends into the accommodating cavity to be connected with the liquid level signal transmission end (not shown in the figure). A protrusion is provided at the lower end of the second electrode 49, and the protrusion forms a detection end 491, that is, an opening is correspondingly provided on the side wall at a distance of 1.5b from the bottom wall, and the protrusion extends into the opening, that is, the distance between the detection end 491 and the bottom wall of the barrel body 44 is h=1.5b, and the top of the protrusion, that is, the detection end, is flush with the side wall, so that the detection end 491 is exposed in the barrel body, which ensures the reliability of the detection and makes the sewage bucket easy to clean. The sewage inlet pipe is directly fitted with the rear side wall of the barrel body, so that there is no gap between the side wall of the sewage bucket and the sewage inlet pipe, avoiding the backflow problem and making the sewage bucket easier to clean. The first electrode 410 is a metal sheet, and a groove 445 is set on the bottom wall of the barrel body 44. The groove 445 extends from the front side wall to the rear side wall. The width of the groove 445 is equal to the width of the first electrode 49. The first electrode 410 lies flat in the groove 445, and also extends from near the rear side wall to the front side wall and passes through the front side wall to connect with the signal transmission section (not shown in the figure). The entire upper surface of the first electrode is flush with the notch of the mounting groove, so that the upper surface of the first electrode 410 is exposed in the barrel body 44. The entire upper surface of the first electrode 410 is the sensing end, ensuring reliable detection and making the sewage bucket easier to clean. The length of the first electrode c = 0.9b, the distance between the tail end of the first electrode 410 and the rear side wall is 1 mm to 5 mm. In this embodiment, the distance between the tail end of the first electrode 410 and the rear side wall is 1 mm. The detection surface of the liquid level detection circuit 7 is the detection end 491 of the second electrode 49. Therefore, when the angle between the body and the surface to be cleaned is 30°, that is, when the angle α between the sewage bucket assembly and the surface to be cleaned is 30°, as shown in FIG. Figure 16As shown, when the sewage in the barrel body submerges the detection end 491 of the second electrode, the liquid level detection circuit 7 is turned on to form a loop, and the main control unit controls the sewage suction motor to reduce the power, so the suction force is reduced, so that the height to which the sewage rises in the barrel body is reduced, thereby avoiding the possibility of contaminating the motor. When the sewage level does not reach the detection end 491, even if the body is tilted to 30°, the liquid level detection circuit cannot be turned on to form a loop, and the main control unit will not control the sewage suction motor to change the power. The sewage suction motor still operates normally at the current working power, thereby ensuring good suction force for the dirty area. Assuming that beverages or other dirt or dirty liquid are spilled under the sofa, the customer directly cleans the floor under the sofa, and the customer directly adjusts the body to be flush with the ground. At this time, the angle between the body and the surface to be cleaned is 0°, that is, the angle α between the sewage bucket assembly and the surface to be cleaned is 0°, as shown in FIG. Figure 17 As shown, since the lowest end of the sensing end 4101 of the first electrode 410 is 1 mm farther from the rear side wall than the detection end 491 of the second electrode at this time, the detection surface is the sensing surface 4101 of the first electrode 410. After the sewage suction motor is turned on with the first power P1=Pe, where Pe is the rated power of the vacuum motor, the sewage is sucked into the barrel body and quickly rises to the tail end of the sensing end 4101. Then, the liquid level detection circuit 7 is turned on to form a loop. The main control unit 8 determines that the body is in the flat cleaning working state based on the liquid trigger signal, and controls the sewage suction motor to reduce the current sewage suction power to P2, thereby ensuring that the body can continue to work when in the flat working state. However, a small amount of sewage can enter the light power operation state, reducing the suction force. It only needs to suck the sewage into the sewage inlet pipe 48 and let it flow into the barrel body from the sewage inlet pipe by gravity, ensuring a safe distance between the exhaust port and the liquid level of the sewage, thereby avoiding the possibility of contamination of the sewage suction motor.

[0076] In this embodiment, a surge detection electrode 471 is further provided on the top cover 41, and the liquid full detection electrode 42 and the surge detection electrode 47 are both arranged on the top cover 41. The lower end of the liquid full detection electrode 42 forms a sensing surface 421, and the lower end of the surge detection electrode 47 is also its detection end 471. The detection end 471 of the surge detection electrode 47 is lower than the sensing surface 421 of the lower end of the liquid full detection electrode 42, and the detection end 471 of the surge detection electrode 47 is located above the detection end 491 of the second electrode 49, so as to detect the state of surge of the dirty liquid. When the surface cleaning device continues to work, the dirty liquid sucked into the barrel body continues to rise, or when the dirty liquid shakes because the customer pushes and pulls the body back and forth for cleaning, the dirty liquid reaches the detection end 471 of the surge detection electrode 47, and the dirty liquid connects the surge detection electrode 47 and the first electrode. When the sewage is sucked into the barrel 44, the surge detection circuit 6 is turned on to form a loop, and the signal is fed back to the main control unit. The main control unit controls the sewage suction motor to further reduce the working power, such as reducing the power of the sewage suction motor to P3. At this time, P3 is less than P2, thereby ensuring that the sewage will not enter the exhaust port and then enter the sewage suction motor due to the surge, so that the sewage suction motor is in a safe working environment when the body is in a flat working state, and the surface cleaning device can normally perform the sewage suction work during cleaning without damaging the sewage suction motor. When the sewage continues to be sucked into the barrel body 44, when the liquid level reaches the sensing surface 421 of the liquid full detection electrode 42, the liquid full detection circuit is turned on to form a loop, the main control unit controls the water pump to stop supplying water, the cleaning part stops rotating, and then the sewage suction motor stops working. The surface cleaning device issues a liquid full alarm and shuts down. The remaining structures of the surface cleaning device described in this embodiment and the beneficial effects produced are consistent with those of embodiment 1, and will not be repeated here.

[0077] Example 3:

[0078] As the surface cleaning device of the present invention, Figure 18 and Figure 19 As shown, the difference from the first embodiment is that the clean water tank 3 is located on the front side of the body 2, and the sewage bucket assembly 4 is located on the rear side of the body 2. The height of the bucket body is 5b. This structure allows the second electrode to more accurately sense the height change of the liquid level as the body tilts. In this embodiment, the sewage bucket assembly 4 includes a body and a top cover. The top cover includes an upper cover body and a lower cover body. The upper cover body is buckled onto the lower cover body to form a accommodating chamber with an upper end open. The accommodating chamber is provided with a gas-liquid separation structure, such as a HEPA. The exhaust port is located on the side wall of the accommodating chamber and is arranged toward the rear side wall of the inner cavity. The exhaust port is located above the sewage inlet pipe. This structure ensures that the liquid level is far away from the exhaust port when the body is lying flat. Even if the sewage is shaken, a large suction force is required to be sucked to the height of the exhaust port, making the operation of the sewage suction motor safer.

[0079] Of course, it is understandable that the second electrode can be configured to include a first metal head (not shown) nested in the first mounting slot and a signal line (not shown) embedded in the rear side wall of the sewage bucket, with the first metal head serving as the detection end of the second electrode; the first electrode can include a second metal head disposed in the second mounting slot and a signal line embedded in the bottom wall of the sewage bucket, with the second metal head serving as the sensing end, and the signal line being led out of the sewage bucket assembly 4, and then connected to the electrical contact piece on the body via an electrical connection contact; alternatively, the second electrode and the first electrode can be configured to be electrode columns disposed in the inner cavity of the sewage bucket, with the electrode columns being in contact with or having a certain gap with the inner wall surface of the sewage bucket; alternatively, the second electrode can be configured to include a metal column, the outer surface of the metal column being wrapped with an insulating sleeve, the insulating sleeve sealing sleeve being disposed outside the metal column, the inner wall surface of the insulating sleeve being in close contact with the outer wall surface of the metal column, thereby preventing sewage from leaking along the contact surface between the insulating sleeve and the metal column. Such technical solutions that do not depart from the technical concept of the present invention are all within the scope of protection of the present invention and will not be exemplified one by one here. The remaining structures of the surface cleaning device described in this embodiment and the beneficial effects produced are consistent with those of the first embodiment and will not be described in detail here.

[0080] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments described above. However, it is easy for those skilled in the art to understand that the scope of protection of the present application is not limited to the above preferred embodiments. Without departing from the technical principles of the present application, those skilled in the art may split and combine the technical solutions in the above preferred embodiments, and may also make equivalent changes or replacements to the relevant technical features. Any changes, equivalent replacements, improvements, etc. made within the technical concept and / or technical principles of the present application will fall within the scope of protection of the present application.

Claims

1. An intelligently controlled surface cleaning device comprising Sewage suction motor, providing power for sucking and collecting sewage or dirt; a fuselage, on which a detachable sewage bucket assembly is provided; A floor brush is hinged to the body and is provided with a cleaning component and a sewage suction port; The main control unit is used to control the operation of the sewage suction motor and cleaning components; It is characterized in that the sewage bucket assembly includes a barrel body and a top cover buckled on the barrel body, the body has a lying flat cleaning working state and a tilted cleaning working state, the sewage bucket assembly is provided with a liquid level detection electrode, the liquid level detection electrode obtains the liquid level signal of the dirty liquid in the barrel body that changes with the tilt angle of the body, and the main control unit determines whether the body is in the lying flat cleaning working state based on the liquid level signal.

2. The surface cleaning device according to claim 1, characterized in that The liquid level detection electrode includes a first electrode provided at the bottom of the barrel body and a second electrode provided near the rear side wall of the barrel body, the detection end of the second electrode is located in the middle of the height direction of the barrel body, the main control unit is electrically connected to the first electrode and the second electrode respectively, and the liquid level signal includes a liquid-free trigger signal and a liquid-present trigger signal; The surface cleaning device starts cleaning, and the main control unit controls the dirt suction motor to work at the first dirt suction power according to the liquid-free trigger signal; The main control unit determines that the machine body is in a lying-flat cleaning working state according to the liquid trigger signal, and controls the sewage suction motor to work at a second sewage suction power; the second sewage suction power is less than the first sewage suction power.

3. The surface cleaning device according to claim 2, wherein: The first electrode includes a sensing end, which is arranged on the bottom wall of the barrel and at least partially exposed to the bottom wall of the barrel, so that the sewage in the barrel contacts the sensing end when the sewage suction motor is working.

4. The surface cleaning device according to claim 3, wherein: The first electrode extends from the front side wall of the barrel body to the rear side wall of the barrel body, and the sensing end is located in the area between the rear side wall and the central axis plane of the sewage barrel.

5. The surface cleaning device according to claim 4, wherein: The first electrode has a plurality of sensing ends, and the distance between at least one sensing end and the rear side wall of the sewage bucket is less than half and greater than one quarter of the thickness of the sewage bucket.

6. The surface cleaning device according to claim 2, wherein: The second electrode is arranged on the rear side wall of the barrel; or, the second electrode extends downward from the top cover, and its extending direction is perpendicular to the extending direction of the first electrode.

7. The surface cleaning device according to claim 2, wherein: The front-to-back thickness of the inner cavity of the barrel body is b, and the distance from the detection end of the second electrode to the first electrode along the height direction of the barrel body is h, and h satisfies 1.5b≤h<2b, so that the sewage bucket assembly is converted from a tilted working state to a flat working state as the body is converted, and when the dirty liquid in the barrel body rises to the detection end of the second electrode, the liquid level detection circuit is turned on and sends a liquid trigger signal to the main control unit. The main control unit controls the reduction of the current working power or current working speed of the sewage suction motor according to the liquid trigger signal; or, the main control unit controls the conversion of the first sewage suction power of the sewage suction motor to the second sewage suction power according to the liquid trigger signal.

8. The surface cleaning device according to claim 2, wherein: It also includes a liquid full detection electrode, which includes a sensing surface exposed inside the barrel body. The liquid full detection electrode extends along the height direction of the barrel body. The liquid full detection electrode is electrically connected to the main control unit. When the dirty liquid in the barrel body rises to contact the sensing surface of the liquid full detection electrode, the liquid full detection circuit is turned on and a liquid full signal is sent. The main control unit controls the sewage suction motor to stop working according to the liquid full signal.

9. The surface cleaning device according to claim 8, wherein The sensing surface of the liquid-full electrode is located in the middle of the barrel along the height direction and the front-to-back direction, and the detection end of the second electrode is not higher than the detection end of the liquid-full detection electrode.

10. The surface cleaning device according to any one of claims 1 to 9, characterized in that An exhaust port is provided on the top cover, and a sewage inlet pipe connected to the sewage suction port is provided on the barrel body. The body is in a flat working state, the sewage inlet pipe is located above one-half of the inner cavity of the sewage barrel, the detection end of the second electrode is arranged close to the surface to be cleaned, and a sewage baffle is provided between the detection end of the second electrode and the sewage inlet pipe. The exhaust port and the pipe mouth of the sewage inlet pipe are separated by the sewage baffle.

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