Surface cleaning apparatus

Abstract

The utility model provides surface cleaning equipment which comprises a handle part, a main body part, a floor brush, a driving mechanism and a flexible transmission mechanism, the floor brush is pivotally connected to the main body part through a connecting part, and the handle part is detachably arranged on the main body part; the floor brush comprises a telescopic scraping part, the driving mechanism is configured to provide rotating driving force, and the flexible transmission mechanism is connected with the driving mechanism and converts the rotating driving force into stretching and retracting of the scraping part relative to the floor brush; wherein when the handle part is pivoted to an inclined operation position, the scraping part is in an expandable configuration, and under the expandable configuration, the driving mechanism and the flexible transmission mechanism can be operated to enable the scraping part to extend and retract relative to the floor brush.

Description

Technical Field

[0001] This disclosure relates to a surface cleaning device. Background Technology

[0002] Surface cleaning equipment is suitable for cleaning hard floor surfaces such as tile and hardwood, as well as soft floor surfaces such as carpet and upholstered surfaces. Some existing vacuum surface cleaning equipment for hard floors includes a fluid delivery system and a fluid recovery system. The former delivers the cleaning fluid to the surface to be cleaned, while the latter removes used cleaning fluid and dirt particles from the surface. A roller brush is also included to agitate the cleaning solution on the surface. The liquid recovery system typically includes a recovery tank, a nozzle adjacent to the surface to be cleaned and fluidly connected to the recovery tank via a working air duct, and a suction source fluidly connected to the working air duct to draw the cleaning solution from the surface to be cleaned into the recovery tank through the nozzle and the working air duct. (Wet) surface cleaning equipment removes stains from the surface by dispensing or recovering liquid onto it and using the agitation of the roller brush. However, some stains are highly adhesive and difficult to remove effectively using this method. Utility Model Content

[0003] This disclosure provides a surface cleaning device designed to provide an efficient and flexible cleaning solution, particularly suitable for removing stubborn stains from surfaces to be cleaned.

[0004] This disclosure provides a surface cleaning device comprising the following main components: a handle portion configured to be detachably mounted on a main body portion for easy user operation and storage; a main body portion serving as the core support structure of the device; a floor brush portion pivotally connected to the main body portion via a connecting portion, allowing its angle to be adjusted relative to the main body portion to adapt to different operating scenarios; a drive mechanism configured to provide rotational driving force; and a flexible transmission mechanism connected to the drive mechanism for converting the rotational driving force into the extension and retraction motion of the scraping portion on the floor brush. Specifically, the floor brush includes a retractable scraping portion configured to contact the surface to be cleaned during operation to scrape away dirt. When the handle portion is pivoted to an inclined operating position, the scraping portion is in an unfolded configuration. In this configuration, the drive mechanism and the flexible transmission mechanism can be operated to extend and retract the scraping portion relative to the floor brush, thereby achieving a dynamic cleaning function.

[0005] In some examples, the drive mechanism includes a servo motor with an output torque ranging from 0.5 N·m to 2 N·m to ensure efficiency and stability. The servo motor is connected to a first end of the drive lever and drives the drive lever to rotate about that end. The flexible transmission mechanism includes a drive lever, a drive block, and a driven lever, wherein a second end of the drive lever is pivotally connected to the drive block, a first end of the driven lever is pivotally connected to the drive block, and the other end is pivotally connected to the scraper. The driven lever is made of a rigid material and adapts to the extension and retraction requirements of the scraper by pivoting at both ends, while optimizing angle changes to transmit driving force. The length ratio of the drive lever to the driven lever is 1:1.5 to 1:2 to improve force transmission efficiency. The flexible transmission mechanism also includes a spring element disposed between the driven lever and the scraper to provide a constant abutment pressure on the scraper in the extended state.

[0006] In some examples, the floor brush further includes guiding features to suppress the degree of freedom of movement of the drive block in the lateral direction of the floor brush. The drive block has a lateral guide groove whose inner wall is coated with a low-friction coating, and the second end of the drive lever is confined within and moves along this guide groove. When the servo is activated, the drive lever rotates, and its second end slides along the lateral guide groove, converting the rotational tangential force into linear motion of the drive block in the longitudinal direction of the floor brush, while releasing the lateral component force to ensure the accuracy of the motion direction. The pivotal connection between the drive block and the driven lever includes a damping element to slow down the movement speed of the driven lever and improve the smoothness of the scraping section's extension and retraction.

[0007] In some examples, the floor brush also includes an inlet through which a scraping head extends. The inlet edge has protrusions configured to scrape away dirt when the scraping head retracts. The scraping head is angled at 80 to 90 degrees relative to the surface being cleaned when extended to enhance the removal efficiency of stubborn stains. Furthermore, the device includes an actuator located on the handle to control the drive mechanism, adjusting the extension and retraction of the scraping head for a convenient user experience.

[0008] In some examples, the driven rod is made of a rigid material and is configured to change the angle between its longitudinal axis and the drive block and the scraper by pivoting its first and second ends when transmitting driving force, in order to accommodate the extension and retraction requirements of the scraper. Attached Figure Description

[0009] The accompanying drawings illustrate exemplary examples of this disclosure and, together with its description, serve to explain the principles of this disclosure. These drawings are included to provide a further understanding of this disclosure and are incorporated in and constitute a part of this specification.

[0010] Figure 1 This is a perspective view of a surface cleaning apparatus according to an example of the present disclosure.

[0011] Figure 2This is a top view of a surface cleaning device according to an example of this disclosure, showing a floor brush in a state where the floor brush cover has been removed.

[0012] Figure 3 This is a side sectional view of a state of the floor brush of a surface cleaning device according to an example of this disclosure.

[0013] Figure 4 This is a top view of another state of the floor brush of a surface cleaning device according to an example of this disclosure, wherein the floor brush has its cover removed.

[0014] Figure 5 This is a side sectional view of another state of the floor brush of a surface cleaning device according to an example of this disclosure.

[0015] Figure 6 A schematic diagram of a surface cleaning system according to an example of this disclosure is shown. Detailed Implementation

[0016] The present disclosure will now be described in further detail with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are for illustrative purposes only and are not intended to limit the scope of the disclosure. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present disclosure are shown in the accompanying drawings.

[0017] It should be noted that, where there is no conflict, the examples and features in this disclosure can be combined with each other. The technical solutions of this disclosure will now be described in detail with reference to the accompanying drawings and examples.

[0018] Unless otherwise stated, the exemplary examples / exemplaries shown are to be understood as providing exemplary features of various details that provide some ways in which the technical concepts of this disclosure can be implemented in practice. Therefore, unless otherwise stated, the features of the various examples / exemplaries may be additionally combined, separated, interchanged and / or rearranged without departing from the technical concepts of this disclosure.

[0019] Existing technologies for cleaning stubborn stains primarily rely on chemical cleaners, tracked or pressurized roller brush designs, and repeated back-and-forth movement of the device by the user. Each method has its specific application scenarios, but also comes with significant drawbacks. Spraying chemical cleaners onto the surface to be cleaned utilizes a chemical reaction to dissolve stains, enhancing cleaning power in certain situations, such as removing greasy kitchen floors or tile surfaces with stubborn stains. However, users need to purchase additional chemical cleaners, increasing economic costs. Furthermore, improper cleaner selection can lead to poor results; some cleaners are only effective on specific stains, requiring frequent cleaner changes and increasing complexity. In addition, chemical cleaners may leave residues that can enter water bodies through drainage systems, polluting the environment, such as causing eutrophication or harming aquatic life. These residues may also pose a threat to human health, especially for households with children or pets, as inhalation or contact with these substances may trigger allergies or respiratory irritation. Therefore, although chemical cleaners are effective in some situations, their high cost and potential environmental and health risks make them less than ideal long-term solutions. The use of tracked or pressurized roller brushes enhances cleaning ability by increasing the contact area and friction between the brush and the surface to be cleaned. This performs reasonably well on hard surfaces, removing some stains through mechanical friction. However, near edges, the shape and movement of the brush make it difficult to effectively reach narrow or irregular areas, resulting in cleaning dead zones. Tracked or pressurized roller brushes are also relatively large, increasing the weight and complexity of the equipment, leading to operator fatigue during prolonged use. Furthermore, their flexibility in confined spaces is limited; for example, when cleaning narrow passages between stairs or furniture, users need to adjust the equipment position, increasing operational complexity. Therefore, this method still has significant shortcomings in edge cleaning and user experience. Another approach relies on the user repeatedly pushing the cleaning device, using the mechanical action of the roller brush to repeatedly rub the stained area to remove stubborn stains. This method is simple to operate and inexpensive, suitable for users with limited budgets. However, it is inefficient, especially when dealing with large-area cleaning tasks. Users need to expend a lot of physical labor, repeatedly pushing the device to gradually remove stains, and its cleaning ability for edge areas remains limited. The roller brush has a limited coverage area and cannot effectively reach corners or narrow crevices. Therefore, this method is difficult to meet the needs of modern users in terms of efficiency and comprehensiveness.

[0020] The shortcomings of the existing technology mentioned above indicate that current surface cleaning equipment generally suffers from problems such as reliance on chemical cleaners, increasing costs and environmental burden, limited effectiveness of roller brush designs in edge cleaning, and low efficiency due to reliance on manual labor when dealing with stubborn stains. These problems reveal an urgent technical need: an improved cleaning head that can efficiently remove stubborn stains through mechanical means, improve edge cleaning capabilities, reduce manual labor, and minimize reliance on chemical cleaners. This invention provides a surface cleaning device with a novel cleaning head, meeting modern users' expectations for efficient, environmentally friendly, and convenient cleaning methods. By introducing a retractable scraper, drive mechanism, and flexible transmission system, it significantly improves cleaning performance, effectively handling stubborn stains and adapting to various operating conditions and surface types, providing a new technological option for home and commercial cleaning. This utility model of surface cleaning equipment significantly improves cleaning performance by using a novel cleaning head called a "floor brush," combined with a retractable scraper, a drive mechanism, and a flexible transmission system. This design not only tackles stubborn stains but also adapts to various operating conditions and surface types, providing an environmentally friendly and effective solution for modern cleaning needs. Compared with traditional equipment, it enhances cleaning capabilities through mechanical action, avoids dependence on chemical cleaning agents, and solves edge cleaning problems through the flexibility and precision of the scraper.

[0021] Figure 1 A structural schematic diagram of the surface cleaning equipment is provided, showing its main components: handle 100, main body 200, cleaning liquid tank 300, dirt collection tank 400, connecting part 500, and floor brush 600. These figures provide a foundation for understanding the implementation of this utility model; subsequent figures are as follows. Figure 3 and Figure 4 The specific aspects of the cleaning head will be described in detail. (Reference) Figure 1 In a preferred embodiment, the surface cleaning device includes a handle 100 detachably mounted to the main body 200, which is pivotally connected to the floor brush 600 via a connecting part 500. The handle 100 has user interaction buttons for controlling the device's start / stop, liquid delivery rate, suction power, and optional functions such as enabling and adjusting the volume of the voice interaction system, and actuating the scraping part 700, enhancing the user experience. The cleaning fluid tank 300 and the dirt collection tank 400 are detachably mounted; the former is integrated into the floor brush 600, and the latter is attached to the rear of the main body 200, lowering the device's center of gravity and facilitating operation.

[0022] like Figure 2 and Figure 3As shown, the floor brush 600 is pivotally attached to the main body and includes a retractable scraping section 700 mechanically connected to the drive structure within the floor brush. The floor brush 600 has a retractable scraping section 700 at its leading edge, which is mechanically connected to the drive mechanism 710 via a flexible transmission system. When the handle 100 is pivoted to the upright storage position, the scraping section 700 remains in a retracted configuration to reduce interference between the scraping section 700 and the surface to be cleaned in a non-cleaning state. When the handle 100 is pivoted to the tilt operating position, the scraping section 700 can switch between retracted and extended configurations based on user input or automatic control. In the extended configuration, the scraping section 700 contacts the surface to be cleaned with constant pressure, effectively removing stubborn stains. The drive mechanism 710 of the scraping section 700 of this disclosure uses a servo motor 711 to generate rotational driving force, which is converted into linear telescopic motion of the scraping section 700 relative to the floor brush by the flexible transmission mechanism 720, as will be described in detail below.

[0023] like Figure 4 and Figure 5 As shown, this disclosure connects the drive mechanism 710 and the retractable scraper 700 via a flexible transmission mechanism 720. In one example, the flexible transmission mechanism 720 includes an active lever 721 connected to a first end of a servo motor 711, a drive block 722 pivotally connected to a second end of the active lever 721, and a driven lever 723 connecting the drive block 722 to the scraper 700. The movement of the drive block 722 is restricted by a guide feature 610 on the floor brush 600, limiting it to longitudinal movement along the floor brush, with lateral displacement suppressed. A guide groove 7221 within the drive block 722 restricts the second end of the active lever 721, dissipating its lateral force component, while transmitting longitudinal force to the scraper 700 via the driven lever 723, thereby driving the scraper 700 to perform longitudinal displacement.

[0024] In one example, a spring 800 is provided between the driven rod 723 and the scraping part 700. The spring 800 is configured to apply a certain contact pressure to the surface to be cleaned when the scraping part 700 contacts the surface, ensuring effective removal of stains. Simultaneously, the spring 800 buffers the thrust of the driven rod 723 on the scraping part 700, preventing rigid force transmission and ensuring that the scraping part 700 does not apply excessive pressure to the surface to be cleaned, thus avoiding damage or scratches. In one example, the spring between the driven rod 723 and the scraping part 700 applies a constant pressure of 1 to 3 Newtons when the scraping part 700 contacts the surface, ensuring effective stain removal while protecting delicate surfaces such as hardwood. The spring is made of a highly elastic metal or polymer and can be compressed or stretched to maintain this pressure, adapting to surface irregularities. Optional damping elements, such as rubber pads, are provided at the pivot connection between the drive block 722 and the driven rod 723, which reduces the movement speed of the driven rod 723 by 20% to 30%, improving the smoothness of the extension and retraction of the scraping part 700 and reducing mechanical wear.

[0025] In one example, the scraper 700 extends and retracts relative to the floor brush 600 via an inlet 620. The inlet 620 has a protruding sleeve edge that removes residual debris by scraping action when the scraper 700 retracts.

[0026] In one example, the drive mechanism 710 includes a servo 711 with an output torque of 0.5 Nm to 2 Nm, connected to a first end of the drive lever 721. When activated by a button on the handle portion 100 or a stain detection sensor, the servo 711 rotates the drive lever 721, generating a tangential force at its second end. This force is managed by a flexible transmission mechanism 720, which includes the drive lever 721, a drive block 722, and a driven lever 723. The drive lever 721 is typically 50 mm to 80 mm long, with its first end pivoting about the output shaft of the servo 711. The second end is pivotally connected to the drive block 722, which is constrained by a guide feature 610 on the brush 600, such as a track or groove, and can only move longitudinally along the brush; lateral movement is prohibited.

[0027] In one example, the guide groove 7221 of the drive block 722 has a width of approximately 10 mm to 20 mm, within which the second end of the drive rod 721 is confined. When the drive rod 721 rotates, its tangential force is divided into lateral and longitudinal components. The lateral component dissipates as it slides within the guide groove 7221, the inner wall of which is coated with a low-friction material such as polytetrafluoroethylene to reduce sliding resistance between the second end of the drive rod 721 and the inner wall of the guide groove 7221.

[0028] When the drive rod 721 rotates, the longitudinal component of the tangential force pushes the inner wall of the guide groove 7221, thereby causing the drive block 722 to move along the trajectory defined by the guide feature 610 on the floor brush 600 in the front-back direction. The driven rod 723 has a length of 75 mm to 160 mm, and its length ratio to the drive rod 721 is 1:1.5 to 1:2. Its first end is pivotally connected to the drive block 722, and its second end is pivotally connected to the scraping part 700.

[0029] The driven rod 723 is made of a rigid material such as stainless steel or reinforced plastic, and its first end is pivotally connected to the drive block 722. Under the translational force of the drive block 722, the driven rod 723 pivots about its first end. The second end of the driven rod 723 is pivotally connected to the scraping section 700. Under the oscillating action of the driven rod 723, the second end distributes the vertical component of the force to the scraping section 700 through the pivotal connection, thereby driving the scraping section 700 to reciprocate along the longitudinal track on the floor brush. Therefore, by adjusting the angle of the driven rod 723 through the pivotal connection, the linear movement of the drive block 722 is aligned with the vertical telescopic path of the scraping section 700 through the inlet 620.

[0030] In some examples, the scraping section 700 itself is elongated, approximately 250 mm to 300 mm in length, covering the width of the floor brush, and is made of a flexible material such as plastic, rubber-like compounds, or composites such as a polypropylene core encased in silicone rubber. This flexibility allows the scraping section 700 to swing back and forth relative to the floor brush, adapting to the surface contours while reducing friction and preventing scratches. In the extended configuration, the scraping section 700 extends 5 mm to 10 mm from the bottom of the floor brush, contacting the surface at an angle of 80° to 90°, optimizing stain removal efficiency. The inlet 620 through which the scraping section 700 moves includes a protruding sleeve edge extending 2 mm to 3 mm beyond the perimeter of the inlet 620, scraping away residual debris as the scraping section 700 retracts, maintaining cleanliness.

[0031] The following describes how to use the scraping section 700 of the surface cleaning apparatus of this disclosure.

[0032] When operating the surface cleaning device on a floor surface, the extension and retraction of the scraper 700 has two control modes: manual and automatic. In manual mode, when a stubborn stain is found, the user presses a button on the handle 100 to activate the servo motor 711 to extend the scraper 700. The user then moves the device back and forth, causing the scraper 700 to repeatedly scrape the stain until it is removed. In automatic mode, an optional stain detection sensor, such as an optical or ultrasonic sensor, is integrated into the floor brush 600 to identify stubborn stains in front. Upon detection of a stain, the sensor signal triggers the servo motor 711 to extend the scraper 700. As the device moves and scrapes the surface, the sensor monitors the progress of stain removal. Once the stain is completely removed, the scraper 700 automatically retracts into the inlet 620.

[0033] When operating the surface cleaning equipment on a base station, the equipment supports a self-cleaning cycle to maintain the hygiene of the scraper 700. In this mode, the scraper 700 extends from the inlet 620, and an optional roller brush inside the floor brush rotates forward and backward at 500 to 800 revolutions per minute, rubbing against the scraper 700 to remove attached debris. The sleeve edge at the inlet 620 is further cleaned as the scraper 700 retracts, while the roller brush removes debris from the sleeve, which is then drawn into the dirt collection bin 400 by suction. This self-cleaning function ensures that the scraper 700 remains effective after multiple uses, reducing maintenance requirements.

[0034] The surface cleaning device disclosed herein can integrate intelligent functions. Figure 4 A schematic diagram of a surface cleaning system incorporating this device is shown, including access point 1100, server 1200, remote control device 1300, database 1400, and wireless communication link 1500. The system supports advanced features such as remote monitoring and control, which are optional characteristics of the device. Figure 6As shown, wireless communication link 1500 connects the device to server 1200, access point 1100, and remote control device 1300, such as a smartphone. Data such as stain detection notifications, battery status, or water tank capacity can be uploaded to a server-hosted application for user monitoring via remote devices. Server 1200 can transmit commands, such as activation or movement instructions for scraper 700, enhancing autonomous operation capabilities. Database 1400 stores operational data—such as scraper 700 usage frequency, liquid level, or maintenance schedule—accessible via access point 1100, supporting predictive maintenance and user customization.

[0035] The cleaning head design enhances edge cleaning by placing the scraper 700 at the leading edge of the brush, allowing it to reach areas within 5 mm of walls or furniture—a significant improvement over the 20-30 mm gap typically left by traditional roller brushes. The flexibility and adjustable contact angle of the scraper 700 (80° to 90°) ensure it adapts to surface variations, such as tile grout or carpet pile, maximizing cleaning coverage. The low-profile design of the brush, less than 120 mm thick, further facilitates cleaning under furniture, overcoming common limitations of traditional, bulkier designs.

[0036] This disclosure reduces environmental impact and operating costs by eliminating chemical cleaning agents and relying on mechanical action to enhance the cleaning and sterilization capabilities of water. The targeted motion of the scraping section 700 reduces manual labor, requiring fewer passes to remove stains compared to repetitive roller brush methods. Edge cleaning performance surpasses that of tracked roller brush designs, while self-cleaning cycles extend component life and reduce downtime. Optional intelligent functions increase convenience, making the device suitable for both manual and semi-autonomous use.

[0037] In one example, the floor brush 600 is approximately 300 mm wide, providing a wide cleaning path. The scraping section 700 is 280 mm long and extends 8 mm from the bottom of the floor brush in the extended configuration, maintained by a stainless steel spring with a contact pressure of 2 Newtons. A servo 711 is mounted inside the floor brush, providing 1 Newton-meter of torque, sufficient to drive the 60 mm drive lever 721 and the 90 mm driven lever 723 with a length ratio of 1:1.5. The guide groove 7221 of the drive block 722 is 25 mm wide and coated with PTFE with a coefficient of friction <0.1, ensuring smooth movement, while a damping pad at the pivot point of the driven lever 723 reduces vibration by 25%.

[0038] Before using the device, prepare it by connecting it to a power source such as a rechargeable battery and filling the cleaning solution tank 300 with water. The user pivots the handle 100 to the tilt position and activates the scraping unit 700 manually or via a sensor. As the device moves across the surface, the scraping unit 700 extends to peel off dirt, followed by the removal of debris and liquid through vacuum action and optional roller brush action. A self-cleaning cycle ensures readiness for subsequent use by placing the device on the storage tray and activating the roller brush.

[0039] The standardized parameters of the scraper 700 disclosed herein include a 0 mm retracted to 10 mm extended range, a contact angle of 80° to 90°, and a servo 711 torque of 0.5 Nm to 2 Nm. The drive lever 721 and driven lever 723 have lengths of 50 mm to 80 mm and 75 mm to 160 mm, respectively, with spring compressions of 1 Nm to 3 Nm. The composite structure of the scraper 700, for example, a polypropylene core encased in silicone rubber, balances durability and flexibility, ensuring long-term performance.

[0040] The above description of the examples in this disclosure is for illustrative purposes only and is not intended to be exhaustive or to limit the disclosure to its precise form. Those skilled in the art will understand that many modifications and variations are possible based on the above disclosure.

[0041] Certain portions of this description use notation to represent algorithms and information operations to illustrate examples of this disclosure. These algorithmic descriptions and representations are commonly used by those skilled in the art of data processing to effectively communicate the substance of their work to others skilled in the art. While these operations are described functionally, computationally, or logically, they are understood to be implemented through computer programs or equivalent circuits, microcode, or similar programs. Furthermore, it is sometimes convenient to arrange these operations as modules without loss of generality. The operations and their associated modules may be embodied in software, firmware, hardware, or any combination thereof.

[0042] Any step, operation, or process described in this disclosure may be performed or implemented by one or more hardware or software modules, alone or in combination with other devices. In one example, the software module is implemented by a computer program product including a computer-readable medium containing computer program code executable by a computer processor to perform any or all of the described steps, operations, or processes.

[0043] Embodiments of this disclosure may also relate to means for performing the operations described herein. Such means may be specifically constructed for the desired purpose, and / or it may comprise a general-purpose computing device selectively activated or reconfigured by a computer program stored in the computer. This computer program may be stored in a non-transitory, tangible, computer-readable storage medium, or any type of medium suitable for storing electronic instructions, which may be connected to a computer system bus. Furthermore, any computing system mentioned in the specification may include a single processor or may employ a multi-processor architecture to enhance computing power.

[0044] Embodiments of this disclosure may also relate to products generated by the computational processes described herein. Such products may include information generated by the computational processes, wherein the information is stored on a non-transitory, tangible, computer-readable storage medium, and may include any example of the computer program products or other combinations of data described herein.

[0045] Finally, the language used in this specification has been chosen primarily for readability and instructional purposes and may not have been chosen to define or limit the subject matter of this disclosure. Therefore, the scope of this disclosure should not be limited to this detailed description, but rather to any claims made on this basis. Thus, the illustrative disclosure of this specification is intended to illustrate, and not limit, the scope of this disclosure.

Claims

1. A surface cleaning apparatus characterized by: The surface cleaning device comprises a handle portion, a main body portion, a floor brush, a driving mechanism and a flexible transmission mechanism, wherein the floor brush is pivotally connected to the main body portion through a connecting portion, and the handle portion is detachably arranged on the main body portion; The floor brush comprises a telescopic scraping portion, the driving mechanism is configured to provide a rotary driving force, and the flexible transmission mechanism is connected with the driving mechanism and converts the rotary driving force into the extension and retraction of the scraping portion relative to the floor brush; When the handle portion is pivoted to an inclined operating position, the scraping portion is in an expandable configuration, and in the expandable configuration, the driving mechanism and the flexible transmission mechanism can be operated to extend and retract the scraping portion relative to the floor brush.

2. The surface cleaning device according to claim 1, wherein: The driving mechanism comprises a steering engine connected to a first end of a driving rod and configured to drive the driving rod to rotate about the first end.

3. The surface cleaning device according to claim 2, wherein: The flexible transmission mechanism comprises the driving rod, a driving block pivotally connected to a second end of the driving rod, and a driven rod pivotally connected to the driving block, wherein a first end of the driven rod is pivotally connected to the driving block, and the other end of the driven rod is pivotally connected to the scraping portion.

4. The surface cleaning device according to claim 3, wherein: The floor brush comprises a guide feature that inhibits the movement freedom of the driving block in the transverse direction of the floor brush.

5. The surface cleaning device according to claim 4, wherein: The driving block comprises a transverse guide slot, and the second end of the driving rod is limited in and moves along the transverse guide slot, so that the tangential force of the rotation of the driving rod is released in the transverse direction of the floor brush, and the force in the longitudinal direction of the floor brush is transmitted to the driving block.

6. The surface cleaning device according to claim 5, wherein: When the steering engine is activated, the driving rod rotates, and the second end of the driving rod moves along the transverse guide slot, thereby converting the rotary driving force into the linear motion of the driving block in the longitudinal direction of the floor brush.

7. The surface cleaning device according to claim 3, wherein: The driven rod is made of a rigid material and is configured to change the angle between its longitudinal axis and the driving block and the scraping portion by pivoting at its first end and second end when transmitting the driving force, so as to adapt to the telescopic requirement of the scraping portion.

8. The surface cleaning device according to claim 2, wherein: The output torque of the steering engine ranges from 0.5 N·m to 2 N·m, so as to ensure the efficiency and stability of the flexible transmission mechanism when driving the scraping portion to extend and retract.

9. The surface cleaning device according to claim 3, wherein: The ratio of the length of the driving rod to the length of the driven rod is 1:1.5 to 1:2, so as to optimize the force transmission efficiency of the flexible transmission mechanism in the conversion of rotary force to linear motion.

10. The surface cleaning device according to claim 3, wherein: The flexible transmission mechanism further comprises a spring member disposed between the driven rod and the scraping portion, configured to provide a constant abutting pressure to the surface to be cleaned when the scraping portion is in the extended state of the deployable configuration.

11. The surface cleaning apparatus of claim 5, wherein: The inner wall of the transverse guide slot is coated with a low-friction coating to reduce the resistance when the second end of the driving rod moves in the transverse guide slot.

12. The surface cleaning apparatus of claim 3, wherein: The pivot connection between the driving block and the driven rod comprises a damping element configured to slow down the movement speed of the driven rod to enhance the smoothness of the extension and retraction of the scraping portion.

13. The surface cleaning apparatus of claim 1, wherein: The floor brush comprises an inlet through which the scraping portion can extend, and the edge of the inlet is provided with a protrusion configured to scrape the stains adhered to the scraping portion when the scraping portion is retracted.

14. The surface cleaning apparatus of claim 1, wherein: An actuator is provided on the handle portion for controlling the driving mechanism to adjust the extension and retraction state of the scraping portion.

15. The surface cleaning apparatus of claim 1, wherein: The scraping portion has an inclination angle of 80 to 90 degrees relative to the surface to be cleaned when extended to enhance the scraping efficiency of stubborn stains.

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