Floor cleaning device

Abstract

The invention relates to a floor cleaning device, comprising: a rolling brush assembly comprising a rolling brush capable of being driven to rotate around its own axis and a plurality of steam spray holes arranged on the rolling brush and distributed in the axial direction, the orifice part of each steam spray hole facing the outside of the rolling brush in the radial direction; a rolling brush motor; the fluid supply unit is provided with a supply tank for accommodating water, a steam generator capable of converting the water into steam, a first pump for conveying the water from the water supply tank to the steam generator, and a steam pipeline for communicating the steam generator with the plurality of steam spray holes through fluid; the control unit is in control connection with the rolling brush motor, the steam generator and the first pump, and the control unit is configured to enable the rolling brush motor, the steam generator and the first pump to operate in a steam cleaning mode; and in the steam cleaning mode, the rolling brush motor can drive the rolling brush to rotate forwards and backwards in a reciprocating manner in at least one period of time under the condition that the orifice parts of the plurality of steam spraying holes are kept downward.

Description

Technical Field

[0001] The present application relates to the technical field of cleaning equipment, and in particular to a floor cleaning device capable of using steam to clean the floor. Background Art

[0002] Steam cleaning technology is widely used in household hard surface cleaning due to its high sterilization efficiency, chemical-free residue-free performance, and deep-cleaning capabilities. The steam roller, a core contact cleaning component, effectively removes stubborn stains from hard surfaces through the dual action of high-temperature steam and mechanical friction.

[0003] However, the existing steam roller brush has some shortcomings in actual use. For example, during the cleaning process, part of the steam may be directly dissipated into the air as the roller brush rotates, resulting in a large part of the steam being unable to fully act on the surface of the stain, thereby reducing the utilization rate of the steam and resulting in insufficient cleaning ability. Summary of the Invention

[0004] In order to solve the above-mentioned problems, the purpose of the present application is to provide a floor cleaning device that can effectively clean stubborn stains.

[0005] To this end, the present application provides a floor cleaning device, comprising: a roller brush assembly, comprising a roller brush capable of being driven to rotate about its own axis, the roller brush being provided with a plurality of steam spray holes, the orifice of each of the steam spray holes being radially directed toward the outside of the roller brush, and the plurality of steam spray holes being distributed along the axial direction of the roller brush; a roller brush motor, arranged in conjunction with the roller brush transmission, to drive the roller brush to rotate about its own axis; a fluid supply unit, comprising a supply tank for containing water, a steam generator capable of converting water into steam, a first pump for conveying water from the water supply tank to the steam generator, and a steam pipeline fluidically connecting the steam generator and the plurality of steam spray holes; and a control unit, control-connected to the roller brush motor, the steam generator, and the first pump, the control unit being configured to operate the roller brush motor, the steam generator, and the first pump in a steam cleaning mode; and in the steam cleaning mode, the roller brush motor is capable of driving the roller brush to rotate forward and backward while maintaining the orifices of the plurality of steam spray holes facing downward for at least a period of time.

[0006] In some preferred embodiments, the floor cleaning device further includes: a switch component, which is configured to be operable by a user and is signal-connected to the control unit; when in the steam cleaning mode and the switch component is turned on, the first pump starts working; when in the steam cleaning mode and the switch component is turned off, the first pump stops working.

[0007] In some preferred embodiments, the switch component is a normally open switch.

[0008] In some preferred embodiments, the switch component is a trigger.

[0009] In some preferred embodiments, in the steam cleaning mode, the roller brush motor drives the roller brush to rotate back and forth within a preset angle range for at least a period of time; wherein the preset angle range is less than or equal to 150°.

[0010] In some preferred embodiments, the preset angle range is 60-120°

[0011] In some preferred embodiments, the floor cleaning device further includes: a position detection component configured to detect whether the multiple steam nozzles of the roller brush are rotated to a specified position; in the specified position, the orifice of each steam nozzle is vertically facing downward.

[0012] In some preferred embodiments, the roller brush includes a roller brush body and a brush bristle material, the brush bristle material is joined to the outer peripheral surface of the roller brush body and the brush bristle material is arranged to avoid the plurality of steam spray holes.

[0013] In some preferred embodiments, the floor cleaning device is provided with a steam cleaning mode switch; after the user triggers the steam cleaning mode switch, the control unit causes the roller brush motor, the steam generator and the first pump to operate in the steam cleaning mode.

[0014] In some preferred embodiments, the floor cleaning device is provided with a floor dirt detection sensor, and the dirt detection sensor is signal-connected to the control unit; the control unit can automatically operate the roller brush motor, the steam generator and the first pump in the steam cleaning mode based on the detection results of the dirt detection sensor.

[0015] In some preferred embodiments, the floor cleaning device further comprises: a plurality of liquid nozzles, which are arranged adjacent to the roller brush and are configured to distribute water from the supply tank to the roller brush.

[0016] In some preferred embodiments, the fluid supply unit also includes: a second pump located between the supply tank and the multiple liquid nozzles; the control unit is controlled and connected to the second pump; the control unit is configured to enable the roller brush motor and the second pump to operate in a water cleaning mode, and when operating in the water cleaning mode, the roller brush is driven by the roller brush motor to rotate continuously in one direction.

[0017] In some preferred embodiments, after the floor cleaning device is turned on and after the steam cleaning mode ends, the floor cleaning device automatically enters the water cleaning mode by default.

[0018] In some preferred embodiments, the floor cleaning device further comprises: a recovery unit configured to recover dirt during the floor cleaning process of the floor cleaning device, wherein the recovery unit comprises a recovery box.

[0019] In some preferred embodiments, the recovery unit further includes: a suction motor, which is fluidically connected to the recovery box; the control unit is controlled and connected to the suction motor; in the steam cleaning mode, the control unit controls the suction motor to start working.

[0020] Compared with the prior art, the beneficial effects of the present application are as follows: by driving the roller brush to rotate reciprocatingly in the steam cleaning mode, most of the steam can be applied to the floor to be cleaned through the steam nozzle, thereby improving the utilization rate of the steam; this not only improves the cleaning performance of the device on stubborn stains, but also improves the energy utilization rate of the floor cleaning device, thereby making cordless floor cleaning devices that use rechargeable batteries as energy have a wider range of uses. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a floor cleaning device according to an embodiment of the present application;

[0022] Figure 2 for Figure 1 A longitudinal sectional schematic diagram of the floor cleaning device shown in ;

[0023] Figure 3 for Figure 1 A schematic longitudinal sectional view of a cleaning base in a floor cleaning device shown in FIG;

[0024] Figure 4 for Figure 1 A schematic diagram of the structure of the interior of the cleaning base in the floor cleaning device shown in FIG;

[0025] Figure 5 for Figure 1 A partial cross-sectional schematic diagram of the cleaning base at the roller brush in the floor cleaning device shown in FIG, showing the position detection assembly in the position where the roller brush is engaged with the housing;

[0026] Figure 6 A schematic diagram of a roller brush assembly according to an embodiment of the present application;

[0027] Figure 7 for Figure 6A schematic side view of the roller brush assembly shown in FIG;

[0028] Figure 8 This is a block diagram of the control principle of a floor cleaning device according to one embodiment of the present application. DETAILED DESCRIPTION

[0029] The floor cleaning device of the present application is configured to selectively utilize water or steam for floor cleaning; in particular, when cleaning stubborn stains on the floor, it can selectively use high-temperature steam to soften the stains and utilize a roller brush for friction to remove the stains from the floor. The technical solution of the floor cleaning device is particularly suitable for cordless cleaning devices that utilize a rechargeable battery pack as an energy source. The floor cleaning device of the present application may be a cleaning device such as a floor scrubber or a floor mop. A typical floor scrubber may also be provided with a functional unit that can recycle used water or steam condensed from used steam; the floor cleaning device of the present application may also be a floor cleaning robot.

[0030] Reference Figure 1 and Figure 2 , which shows an example of a floor cleaning device. This floor cleaning device 100 is a manually operated floor scrubber, specifically an upright floor scrubber. During use, the user holds the floor cleaning device 100 and pushes it across the floor to be cleaned, causing the floor cleaning device 100 to clean the area.

[0031] The floor cleaning device 100 includes an upright body 1 and a cleaning base 2. The user grasps the handle 11 on top of the upright body 1 to move the cleaning base 2 across the surface to be cleaned, and the cleaning base 2 cleans the area it passes over. The floor cleaning device 100 also includes components such as a roller brush assembly 3, a fluid supply unit 4, and a recovery assembly 5.

[0032] like Figure 3 、 Figure 4 and Figure 5 As shown, the cleaning base 2 includes a shell 21 with a roller brush chamber 210 at the front. The roller brush assembly 3 is installed in the roller brush chamber 210. A roller brush motor 22 is also installed in the shell 21, which can drive the roller brush 31 of the roller brush assembly 3 to rotate around its own axis X. In this example, the roller brush assembly 3 will be removably installed in the shell 21. The roller brush motor 22 is located on the rear side of the roller brush assembly 3, and the two are connected by transmission components such as a transmission belt and a gear set. In other embodiments, a built-in roller brush motor built into the inside of the roller brush 31 can also be provided.

[0033] Combine Figure 6 and Figure 7As shown, the roller brush assembly 3 includes a roller brush 31, a first end cap 32 mounted on either side of the roller brush 31, and a second end cap 33. The second end cap 33 is mounted with a connector 34 that is rotatable relative to the second end cap about the axis X. After the roller brush assembly 3 is installed in the roller brush chamber 210, the first end cap 32 is in transmission connection with the roller brush motor 22, and the connector 34 on the second end cap 33 is fixedly engaged with the housing 21.

[0034] The roller brush 31 is cylindrical as a whole and includes a roller brush body 311 and a bristle material 312. The roller brush body 311 is a hollow structure. A steam distribution chamber 313 and a plurality of steam nozzles 314 are provided on the roller brush body 311. The orifice portion of each steam nozzle 314 faces the outside of the roller brush 31 in the radial direction. The steam provided by the steam supply unit 4 can be transported to the steam distribution chamber 313 and output to the outside by the plurality of steam nozzles 314. In this example, the plurality of steam nozzles 314 are distributed along the axial direction of the roller brush 21; these steam nozzles 314 are arranged in a row along a straight line L parallel to the axis X.

[0035] A plurality of openings 3120 are cut out on the bristle material 312, and these openings 3120 are opposite to the positions of the steam nozzles 314. By arranging these openings 3121, the bristle material 312 can avoid the plurality of steam nozzles 314. These openings 3120 can be constructed by "punching holes" in the bristle material 312. Or the bristle material 312 can be pre-cut to form the gaps or holes corresponding to the openings 3120 before being wound on the outer peripheral surface of the roller brush body 311. Since the steam escaping from each steam nozzle 314 is not sprayed directly onto the hairs of the bristle material 312, it can avoid the problem of reduced life of the roller brush hairs due to steam spraying. For example, if the steam is not directly sprayed onto the bristle material 312, this will effectively prevent the adhesive from failing and causing the bristle material 312 to peel off from the roller brush body 311, or the bristle material 312 from being in a steam high temperature environment for a long time and accelerating fiber aging.

[0036] Continue as Figure 3 and Figure 4 As shown, the cleaning base 2 further includes a plurality of liquid nozzles 23 and a wiper strip 24. The liquid nozzles 23 are disposed adjacent to the roller brush 31 and are configured to dispense water onto the bristle material 312 of the roller brush 31. The wiper strip 24 is capable of contacting the bristle material 312 of the roller brush 31. During the rotation of the roller brush 31, the wiper strip 24 is capable of continuously scraping excess liquid from the bristle material 312 and recovering it by the recovery unit 5.

[0037] Combine Figure 2As shown, the fluid supply unit 4 is used to selectively provide steam or water. The fluid supply unit 4 includes a supply tank 41 for holding water, a steam generator 42 capable of converting water into steam, a first pump 43 for transporting water from the supply tank 41 to the steam generator 42, a steam pipeline (not shown) connecting the steam outlet of the steam generator 42 with the steam distribution chamber 313, a water output pipeline (not shown) fluidically connecting the supply tank 41 with the liquid nozzles 23, and a second pump 46 disposed on the water output pipeline. When the first pump 43 and steam generator 42 are activated and the second pump 44 is deactivated, the fluid supply unit 4 can output steam to the multiple steam nozzles 314. When the second pump 46 is activated and the first pump 43 is deactivated, the fluid supply unit 4 can output steam to the multiple liquid nozzles 23.

[0038] The recovery assembly 5 includes a suction motor 51, a recovery tank 52, and a recovery line 53. One end of the recovery line 53 connects to the roller brush chamber 210. Fluid or waste entering the roller brush chamber 210 is sucked into the recovery tank 52. In other embodiments, the recovery assembly can be replaced with a solution similar to a cleaning assembly, which can reel in dirt from the floor to be cleaned without suction; such a cleaning assembly may not include a suction motor.

[0039] Continue as Figure 5 As shown, the cleaning base 2 is also equipped with a position detection assembly 6. This assembly is used to detect whether the multiple steam spray holes 314 on the roller brush 31 have rotated to a specified position relative to the housing 21. In this specified position, the openings of the multiple steam spray holes 314 face vertically downward. This position detection assembly 6 can indirectly determine the position of the openings of the multiple steam spray holes 314, thereby controlling the floor cleaning device 100 to initiate the steam cleaning mode described below.

[0040] The position detection assembly 6 includes a sensing element 61 arranged on the housing 21 and a sensed element 62 arranged on the roller brush assembly 3. The sensed element 62 can be sensed by the sensing element 61 when it enters the sensing area of ​​the sensing element 61. The sensing element 61 and the sensed element 62 are preferably non-contact sensing elements and non-contact sensed elements, respectively; for example, the sensing element 61 is a Hall sensor, and the sensed element 62 is a magnet. Specifically, the sensed element 62 is arranged at the first end cover 32. In other embodiments, the position detection assembly may also adopt an infrared transmitting and receiving sensor equivalent position detection solution.

[0041] Continue as Figure 2As shown, floor cleaning device 100 also includes a rechargeable battery pack 7. Battery pack 7 is electrically connected to the energy-consuming components of device 100 to power them. Battery pack 7 is located on vertical body 1. In other embodiments, the battery pack is omitted, and the floor cleaning device instead utilizes an external power source for power.

[0042] like Figure 8 As shown, the floor cleaning device 100 also includes a control unit 8. In one embodiment, the control unit 8 may include a main control board. The main control board includes, for example, a microprocessor, a memory, etc. The microprocessor is connected to the memory and is capable of executing program instructions stored in the memory. The control unit 8 is connected to the roller brush motor 22, the suction motor 51, the steam generator 42, the first pump 43, and the second pump 44. The control unit 8 is configured to operate the roller brush motor 22, the steam generator 42, and the first pump 43 in a steam cleaning mode and to operate the roller brush motor 22, the suction motor 51, and the second pump 44 in a water cleaning mode.

[0043] The floor cleaning device 100 is also provided with a human-machine interface 9, and the control unit 8 is operatively coupled to the human-machine interface to receive user input. A switch component 9 is also provided. The control unit 8 is also operatively coupled to the user interface on the floor cleaning device 100 to receive user input. The user interface can be used to control the operation of the floor cleaning device 100. The human-machine interface 9 may include a switch component 91, an on / off switch 92, a steam cleaning mode switch 93, and the like. The switch component 91 is configured to be user-operable. In steam cleaning mode, when the switch component 9 is turned on, the first pump 43 starts operating; in steam cleaning mode, when the switch component 9 is turned off, the first pump 43 stops operating. The switch component 91 is preferably a normally open switch, such as a trigger. The switch component 9 is preferably located near the handle 11. Preferring a normally open switch allows steam to be output under safe conditions. The on / off switch 92 can turn the floor cleaning device 100 on and off, for example, and can be configured to control power to one or more electrical components of the floor cleaning device 100. The steam cleaning mode switch 93 can be configured to operate the floor cleaning device 100 in the steam cleaning mode, such as starting or stopping the steam generator 42, the first pump 43, the roller brush motor 22, etc. according to the program settings corresponding to the mode.

[0044] When the control unit 8 causes the roller brush motor 22, the suction motor 51, and the second pump 44 to operate in the water cleaning mode, the suction motor 51, the roller brush motor 22, and the second pump 44 are simultaneously turned on; the second pump 44 delivers water from the supply tank 41 to the liquid nozzle 23 via the water output pipe 45 and distributes it to the bristle material 312 of the roller brush 31. The roller brush motor 22 drives the roller brush 31 to continuously rotate in the positive direction about its own axis X (the counterclockwise direction shown in the figure is the positive direction). The bristle material 312 of the roller brush 31 continuously rubs the floor to be cleaned. The scraper bar 24 removes the dirty liquid adsorbed on the bristle material 312 of the roller brush 31. The dirty liquid and the dirt on the floor are sucked into the recovery tank 52 by the suction motor 51. Typically, after the floor cleaning device 100 is turned on (i.e., the on / off switch 92 is turned on), the floor cleaning device 100 enters this water cleaning mode by default. In the water cleaning mode, since there is no need to heat the water, it is an energy-saving cleaning mode compared to the steam cleaning mode.

[0045] When the control unit 8 causes the roller brush motor 22, the steam generator 42, and the first pump 43 to operate in the steam cleaning mode, the roller brush motor 22, the steam generator 42, and the first pump 43 are turned on in stages. The operation of the entire steam cleaning mode is divided into multiple steps. The specific steps of operating in the steam cleaning mode are shown below.

[0046] Step S1: After receiving the instruction to operate in steam cleaning mode, the control unit first enters the preparation stage; in this preparation stage: the roller brush motor 22 drives the roller brush 31 to continuously rotate in the positive direction around its own axis X ( Figure 3 The counterclockwise direction indicated by the middle arrow F is the positive direction). At this time, the second pump 44 is shut down, and the steam generator 42 starts preheating for tens of seconds (such as 30 seconds or 40 seconds). In the few seconds before the end of preheating, the roller brush motor 22 is controlled to rotate the multiple steam nozzles 314 of the roller brush 31 to the specified position relative to the shell 21. When the position detection component 6 detects that the multiple steam nozzles 314 of the roller brush 31 have rotated to the specified position, the orifices of the multiple steam nozzles 314 remain vertically downward, and the preparation stage work is completed.

[0047] It should be noted that the instruction to operate in steam cleaning mode received by the control unit 8 may be triggered by the steam cleaning mode switch 93, or may be automatically issued by the control unit 8 after self-determining that a condition is met. For example, in some embodiments, the floor cleaning device 100 is provided with a floor dirt detection sensor, which is signal-connected to the control unit; the control unit can automatically operate the roller brush motor, steam generator, and first pump in steam cleaning mode based on the detection results of the dirt detection sensor; this is more common when the floor cleaning device is a cleaning robot.

[0048] Step S2: After the preparation phase is completed, the roller brush motor 22 drives the roller brush 31 to rotate back and forth (i.e., rotate alternately clockwise and counterclockwise) while maintaining the openings of the plurality of steam spray holes 314 facing downward. In order to maintain the openings of the plurality of steam spray holes 314 facing downward, the roller brush motor 22 drives the roller brush 31 at a predetermined angle β (see Figure 3 ) range; the preset angle range is less than 180 degrees, preferably less than or equal to 150 degrees, and more preferably 60-120 degrees, such as 90 degrees, that is, it rotates back and forth within the range of ±45 degrees; during this process, the user turns on the switch component 91, the first pump 43 will start to transport water into the steam generator 42, and the steam generated by the steam generator 42 will be sprayed toward the floor to be cleaned through the multiple steam nozzles 314; at this time, the orifices of the multiple steam nozzles 314 are maintained in a downward state, and almost all of the steam sprayed from the multiple steam nozzles 314 is applied to the floor to be cleaned.

[0049] It should be noted that in step S2, if the user turns off the switch component 9, the roller brush motor 22 still drives the roller brush 31 to rotate back and forth within the preset angle range. At this time, no water will be transported to the steam generator 42 to be converted into steam output, and the multiple steam nozzles 314 will stop spraying steam onto the ground; when the user turns on the switch component 91 again, water will be transported to the steam generator 42 to be converted into steam output.

[0050] Step S3: When the control unit receives the instruction to end the operation in the steam cleaning mode, the operation in the steam cleaning mode ends and the floor cleaning device 100 switches to the water cleaning mode again.

[0051] It should be noted that the instruction in step S3 may come from the re-triggering of the steam cleaning mode switch 93, or it may come from the control unit 8 automatically issuing the end instruction after self-judgment that the end conditions are met. The self-judgment of whether the end conditions are met may be based on the detection results of the ground dirt detection sensor, or it may be based on whether the running time has reached the set time.

[0052] During the operation of the floor cleaning device 100 in the steam cleaning mode, the control unit 8 can control the suction motor 51 to start working, or it can shut down the suction motor 51; and if it is chosen to control the suction motor 51 to start working, it is preferably operated under low power and small suction parameters, especially during step S2, in order to reduce steam loss, it is preferably shut down the suction motor 51.

[0053] In this case, the floor cleaning device operates in steam cleaning mode, with the roller brush rotating back and forth within a preset angle range, ensuring that the multiple steam nozzles are always facing downward. Steam repeatedly impacts the floor as the nozzles rotate, effectively cleaning stubborn stains and sterilizing. When steam cleaning mode ends, the floor cleaning device switches to steam-off mode, returning the water pump, roller brush, and suction motor to normal operation. Water and dirt on the floor are then sucked into the wastewater tank by the suction motor.

[0054] Although exemplary embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes and modifications may be made, and equivalents may be substituted for the elements without departing from the actual scope of the present invention. Furthermore, many modifications may be made to accommodate particular circumstances and the teachings of the present invention without departing from its central scope. Therefore, all embodiments falling within the scope of the claims of the present invention are intended to be within the scope of the present invention.

Claims

1. A floor cleaning device comprising: A roller brush assembly, comprising a roller brush capable of being driven to rotate about its own axis, the roller brush being provided with a plurality of steam spray holes, the orifice of each steam spray hole being radially oriented toward the outside of the roller brush, and the plurality of steam spray holes being distributed along the axial direction of the roller brush; A roller brush motor, arranged together with the roller brush transmission, to drive the roller brush to rotate around its own axis; a fluid supply unit having a supply tank containing water, a steam generator capable of converting water into steam, a first pump for delivering water from the water supply tank to the steam generator, and a steam pipeline fluidly connecting the steam generator and the plurality of steam spray holes; as well as A control unit is controllably connected to the roller brush motor, the steam generator, and the first pump, and is configured to operate the roller brush motor, the steam generator, and the first pump in a steam cleaning mode; and in the steam cleaning mode, the roller brush motor is capable of driving the roller brush to rotate forward and backward while maintaining the orifices of the multiple steam spray holes facing downward for at least a period of time.

2. The floor cleaning device according to claim 1, characterized in that: Also includes: A switch component is configured to be operable by a user and is connected to the control unit signal; when the switch component is turned on in the steam cleaning mode, the first pump starts working; when the switch component is turned off in the steam cleaning mode, the first pump stops working.

3. The floor cleaning device according to claim 1, characterized in that: The switch component is a normally open switch.

4. The floor cleaning device according to claim 1, characterized in that: The switch component is a trigger.

5. The floor cleaning device according to claim 1, characterized in that: In the steam cleaning mode, the roller brush motor drives the roller brush to rotate back and forth within a preset angle range for at least a period of time; wherein the preset angle range is less than or equal to 150°.

6. The floor cleaning device according to claim 5, characterized in that: The preset angle range is 60-120°.

7. The floor cleaning device according to claim 1, characterized in that: Also includes: a position detection component configured to detect whether the plurality of steam spray holes of the roller brush are rotated to a specified position; In this designated position, the orifice portion of each of the steam spray holes faces vertically downward.

8. The floor cleaning device according to claim 1, characterized in that: The roller brush includes a roller brush body and a brush bristle material. The brush bristle material is joined to the outer peripheral surface of the roller brush body and is arranged to avoid the plurality of steam spray holes.

9. The floor cleaning device according to claim 1, characterized in that: The floor cleaning device is provided with a steam cleaning mode switch; after the user triggers the steam cleaning mode switch, the control unit causes the roller brush motor, the steam generator and the first pump to operate in the steam cleaning mode.

10. The floor cleaning device according to claim 1, characterized in that: The floor cleaning device is provided with a floor dirt detection sensor, which is signal-connected to the control unit; the control unit can automatically operate the roller brush motor, the steam generator and the first pump in the steam cleaning mode based on the detection results of the dirt detection sensor.

11. The floor cleaning device according to claim 1, characterized in that: Also includes: A plurality of liquid nozzles are disposed adjacent to the roller brush and are configured to distribute water from the supply tank to the roller brush.

12. The floor cleaning device according to claim 11, characterized in that: The fluid supply unit also includes: a second pump located between the supply tank and the multiple liquid nozzles; the control unit is controlled and connected to the second pump; the control unit is configured to enable the roller brush motor and the second pump to operate in a water cleaning mode, and when operating in the water cleaning mode, the roller brush is driven by the roller brush motor to rotate continuously in one direction.

13. The floor cleaning device according to claim 12, characterized in that: After the floor cleaning device is turned on and the steam cleaning mode is finished, the floor cleaning device automatically enters the water cleaning mode by default.

14. The floor cleaning device according to claim 1, characterized in that: Also includes: The recovery unit is configured to recover dirt during the floor cleaning process of the floor cleaning device, and the recovery unit includes a recovery box.

15. The floor cleaning device according to claim 1, characterized in that: The recovery unit further includes: a suction motor, which is in fluid communication with the recovery box; the control unit is control-connected to the suction motor; in the steam cleaning mode, the control unit controls the suction motor to start working.

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