Method and device for automatically replacing bed sheet and electric bed

Abstract

The embodiment of the invention provides a method and device for automatically replacing a bed sheet and an electric bed, the electric bed comprises an electric bed body, a first side and a second side, the first side is two opposite sides in the long side direction or two opposite sides in the short side direction of the electric bed body, the second side is any one side except the first side, and the first side and the second side are opposite to each other. A transmission part is arranged on the first side of the electric bed, a telescopic mechanical arm is arranged on the transmission part, a storage box is arranged on the second side of the electric bed, the storage box is used for storing a bed sheet, and the method comprises the steps that a bed sheet replacement request is detected; in response to the bed sheet replacement request, the transmission part is started, and under the condition that a mechanical arm on the transmission part clamps a first bed sheet in the storage box, along with transmission of the transmission part, the mechanical arm grabs the bed sheet to move until the first bed sheet covers a body of the electric bed.

Description

Technical Field

[0001] The present application relates to the field of electric beds, and in particular to a method and device for automatically changing bed sheets, and an electric bed. Background Art

[0002] With the accelerated pace of modern life and the enhancement of personal hygiene awareness, household cleaning and maintenance have become an indispensable part of people's daily lives. Among them, the replacement and washing of bedding such as sheets and quilt covers is an important part of keeping the sleeping environment clean. However, the traditional way of changing and washing usually relies on manual operation, and the operator is usually women, who need to lift the mattress, replace it, and then put it back in place. This is not only time-consuming and laborious, but also increases the difficulty of changing sheets for busy modern people. Summary of the invention

[0003] The embodiments of the present application provide a method, device, and electric bed for automatically changing bed sheets, which can automatically detect a request to change bed sheets and automatically change the bed sheets, thereby improving the efficiency of changing bed sheets and enhancing the user's convenience and quality of life.

[0004] In a first aspect, an embodiment of the present application provides a method for automatically changing bed sheets, which is applied to an electric bed, wherein the electric bed comprises an electric bed body, a first side and a second side, wherein the first side is two sides opposite to each other in a long side direction or two sides opposite to each other in a short side direction of the electric bed body, and the second side is any side other than the first side, wherein the first side of the electric bed is provided with a transmission component, wherein a retractable mechanical arm is provided on the transmission component, and an end of the mechanical arm can be tightened to a gripping state to clamp the bed sheets, and the second side of the electric bed is provided with a storage box, wherein the storage box is used to store the bed sheets, and the method comprises:

[0005] Detect bed linen change requests;

[0006] In response to the request to change the bed sheet, the transmission component is started, and the mechanical arm on the transmission component clamps the first bed sheet in the storage box. As the transmission component is driven, the mechanical arm grasps the bed sheet and moves until the first bed sheet covers the body of the electric bed.

[0007] In some possible embodiments, a third side of the electric bed opposite to the second side is provided with a rotating shaft, a first sensor is provided on the rotating shaft, and after the mechanical arm grasps the first bed sheet and moves until the bed sheet covers the body of the electric bed, the method further includes:

[0008] When the mechanical arm grasps the first bed sheet and contacts the rotating shaft, the transmission component is paused, and the end of the mechanical arm changes from the grasping state to the unfolded state to release the clamping of the first bed sheet;

[0009] When the first sensor of the rotating shaft detects contact with the bed sheet, the rotating shaft is started to rotate to wrap the first bed sheet portion around the rotating shaft;

[0010] When the rotation time reaches a first preset time length, the rotating shaft stops rotating.

[0011] In some possible embodiments, the electric bed body is provided with a second sensor, a portion of the second sheet on the electric bed is wound around the rotating shaft, and before starting the transmission component, the method further includes:

[0012] When the second sensor detects that the electric bed body is covered with a second bed sheet, the rotating shaft is started to wind the second bed sheet around the rotating shaft;

[0013] When the rotation time of the shaft reaches a second preset time length, the shaft stops rotating, wherein the second preset time length is a preset minimum time length required for the second bed sheet to be completely wrapped around the shaft, and the second preset time length is greater than the first preset time length.

[0014] In some possible embodiments, a recovery box is disposed on the third side of the electric bed, and the rotating shaft is disposed above the recovery box. The method further includes:

[0015] detecting, by the first sensor according to a preset detection cycle, whether the thickness of the bed sheet wrapped around the rotating shaft exceeds a preset thickness threshold;

[0016] When the thickness of the bed sheet wrapped around the rotating shaft exceeds a preset thickness threshold, the rotating shaft starts to rotate in a direction opposite to the direction of wrapping the bed sheet, so that the wrapped bed sheet is at least partially stored in the recycling box.

[0017] In some possible embodiments, a third sensor is disposed in both the recycling box and the storage box, and the method further includes:

[0018] When a third sensor in the recycling box detects that the weight of the bed sheet in the recycling box exceeds a first preset weight threshold, a first prompt message is output;

[0019] When the third sensor in the storage box detects that the weight of the sheets in the storage box is less than a second preset weight threshold, a second prompt message is output.

[0020] In some possible embodiments, the second sensor is a plurality of photosensitive sensors, and the method further includes:

[0021] Obtaining a stain distribution image of the bed sheet of the electric bed by using the multiple photosensitive sensors, and performing image recognition on the stain distribution image to obtain the stain distribution position and size;

[0022] When the size of the stain distribution exceeds a preset size threshold, or the position of the stain is located in a preset area, a third prompt information is output.

[0023] In some possible embodiments, the electric bed is provided with a light source, and obtaining the stain distribution image of the bed sheet of the electric bed through the multiple photosensitive sensors includes:

[0024] When the sheets on the electric bed are irradiated by a light source according to a preset period, an area where the light intensity of the light source received by the photosensitive sensor is lower than a preset threshold is judged as a target area where stains exist, and a stain distribution image of the sheets on the electric bed is obtained based on the target areas identified by multiple photosensitive sensors.

[0025] In some possible embodiments, the transmission component is a crawler track.

[0026] In a second aspect of the present application, an embodiment provides an automatic bed sheet changing device, which is applied to an electric bed, wherein the electric bed comprises an electric bed body, a first side and a second side, wherein the first side is two sides opposite to each other in the long side direction or two sides opposite to each other in the short side direction of the electric bed body, and the second side is any side other than the first side, wherein the first side of the electric bed is provided with a transmission component, and a retractable mechanical arm is provided on the transmission component, and the end of the mechanical arm can be tightened to a gripping state to clamp the bed sheet, and the second side of the electric bed is provided with a storage box, and the storage box is used to store the bed sheet, and comprises:

[0027] A detection module, used to detect a bed sheet change request;

[0028] The replacement module is used to respond to the bed sheet replacement request and start the transmission component. When the mechanical arm on the transmission component clamps the first bed sheet in the storage box, as the transmission component is driven, the mechanical arm grasps the bed sheet and moves until the first bed sheet covers the body of the electric bed.

[0029] In a third aspect of the present application, an embodiment provides an electric bed, the electric bed comprising a bed body, a first side and a second side, the first side being two sides opposite to each other in the long side direction or the short side direction of the electric bed body, the second side being any side other than the first side, the first side of the electric bed being provided with a transmission component, the transmission component being provided with a retractable mechanical arm, the end of the mechanical arm being tightened to a gripping state to clamp a bed sheet, the second side of the electric bed being provided with a storage box, the storage box being used to store bed sheets, the electric bed further comprising a device for automatically changing bed sheets, the device for automatically changing bed sheets comprising:

[0030] processor;

[0031] a memory for storing instructions executable by the processor;

[0032] Wherein, the processor is configured to execute the instructions to implement a method for automatically changing bed sheets as described in any one of the embodiments of the first aspect of the present application.

[0033] The technical solution provided by the embodiment of the present application includes at least the following beneficial effects:

[0034] The embodiment of the present application provides a method for automatically changing bed sheets, which is applied to an electric bed, wherein the electric bed includes an electric bed body, a first side and a second side, wherein the first side is the two sides opposite to the long side direction or the two sides opposite to the short side direction of the electric bed body, and the second side is any side other than the first side, wherein the first side of the electric bed is provided with a transmission component, wherein the transmission component is provided with a retractable mechanical arm, and the end of the mechanical arm can be tightened to a gripping state to clamp the bed sheet, and the second side of the electric bed is provided with a storage box, wherein the storage box is used to store the bed sheet, and the method includes: detecting a bed sheet replacement request; in response to the bed sheet replacement request, starting the transmission component, and when the mechanical arm on the transmission component clamps the first bed sheet in the storage box, as the transmission component is driven, the mechanical arm grips the bed sheet and moves until the first bed sheet is covered on the body of the electric bed. The method can detect a bed sheet replacement request and automatically replace the bed sheet, thereby improving the efficiency of changing the bed sheet and further improving the user's life convenience and quality of life. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1-1 A schematic diagram of the structure of an electric bed proposed in an embodiment of the present application;

[0036] Figure 1-2 A schematic diagram of the side structure of an electric bed proposed in an embodiment of the present application;

[0037] Figure 2-1 A schematic flow chart of a method for automatically changing bed sheets proposed in an embodiment of the present application;

[0038] Figure 2-2 A schematic diagram of an electric bed that automatically changes sheets, as proposed in an embodiment of the present application;

[0039] Figure 2-3 A schematic diagram of another electric bed for automatically changing bed sheets proposed in an embodiment of the present application;

[0040] Figure 2-4 A schematic diagram of another electric bed for automatically changing bed sheets proposed in an embodiment of the present application;

[0041] Figure 3A schematic flow chart of another method for automatically changing bed sheets proposed in an embodiment of the present application;

[0042] Figure 4 A schematic flow chart of another method for automatically changing bed sheets proposed in an embodiment of the present application;

[0043] Figure 5 A schematic flow chart of another method for automatically changing bed sheets proposed in an embodiment of the present application;

[0044] Figure 6 A schematic flow chart of another method for automatically changing bed sheets proposed in an embodiment of the present application;

[0045] Figure 7 A schematic flow chart of another method for automatically changing bed sheets proposed in an embodiment of the present application;

[0046] Figure 8 This is a schematic diagram of the structure of a device for automatically changing bed sheets proposed in an embodiment of the present application;

[0047] Fig. 9 This is a schematic structural diagram of another device for automatically changing bed sheets proposed in an embodiment of the present application. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0049] In order to facilitate the clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, the words "first" and "second" are used to distinguish the same items or similar items with substantially the same functions and effects. For example, the first instruction and the second instruction are to distinguish different user instructions, and their order is not limited. Those skilled in the art can understand that the words "first" and "second" do not limit the quantity and execution order, and the words "first" and "second" do not necessarily limit them to be different.

[0050] It should be noted that, in the embodiments of the present application, words such as "exemplarily" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplarily" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplarily" or "for example" is intended to present related concepts in a specific way.

[0051] In addition, "at least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can mean: a, or b, or c, or a and b, or a and c, or b and c, or a, b and c, where a, b, c can be single or multiple.

[0052] It should be noted that in the embodiments of the present application, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0053] With the development of society and the accelerated pace of life, people's health awareness and personal hygiene concepts are also constantly evolving. A clean and comfortable home environment is essential to maintaining physical and mental health. In particular, the cleanliness of the sleeping environment, as a place where people rest and rejuvenate every day, directly affects the quality of sleep and overall health. As items that directly contact the skin, bedding such as sheets and quilts is particularly important for their cleanliness. Failure to replace or wash bedding for a long time may lead to the accumulation of dandruff, sweat stains, dust and microorganisms (such as bacteria and fungi), which may become allergens or pathogens, affecting the health of residents.

[0054] However, in a fast-paced lifestyle, many people find that the traditional way of changing and washing sheets is time-consuming and laborious. Especially for large-sized beds, each time the sheets are changed, the new sheets need to be laid out manually, which undoubtedly increases the complexity and physical exertion of the work. Moreover, due to busy work or other reasons, people often find it difficult to ensure that the bedding is changed regularly at the recommended time interval, especially for the elderly who cannot ensure the regular change of sheets due to physical reasons, which may cause potential health hazards.

[0055] The current bedding management and maintenance technologies on the market mainly include manual replacement, home washing machines, smart laundry equipment, disposable sheets / bed covers, and smart home system integration. Among them, manual replacement is the most traditional method. Although it is simple and intuitive, it is inefficient and time-consuming, especially when dealing with larger beds. In addition, some high-end residential smart home control systems allow remote monitoring of every corner of the home, including the bedroom area, through mobile phone applications, but these systems have a wide range of applications, and the management functions for bedding are relatively limited, and automated replacement services cannot be realized. In summary, the existing solutions have certain limitations in convenience and automation. Especially in the case of large beds or frequent replacement needs, it is particularly necessary to develop a more intelligent bedding management system, which can not only improve the convenience and comfort of life, but also help to ensure personal hygiene and health.

[0056] In order to solve the above technical problems, the embodiment of the present application proposes a method for automatically changing bed sheets, which is applied to an electric bed, wherein the electric bed includes an electric bed body, a first side and a second side, wherein the first side is the two sides opposite to the long side direction or the two sides opposite to the short side direction of the electric bed body, and the second side is any side other than the first side, wherein the first side of the electric bed is provided with a transmission component, wherein the transmission component is provided with a retractable mechanical arm, and the end of the mechanical arm can be tightened to a gripping state to clamp the bed sheet, and the second side of the electric bed is provided with a storage box, wherein the storage box is used to store the bed sheet, and the method includes: detecting a bed sheet replacement request; in response to the bed sheet replacement request, starting the transmission component, wherein the mechanical arm on the transmission component clamps the first bed sheet in the storage box, and as the transmission component is driven, the mechanical arm grips the bed sheet and moves until the first bed sheet is covered on the body of the electric bed. The method automatically replaces the bed sheet by detecting the bed sheet replacement request, thereby improving the efficiency of changing the bed sheet and further improving the user's life convenience and quality of life.

[0057] The following is a detailed explanation of an example of an electric bed system architecture in an embodiment of the present application. For example, Figure 1-1 As shown, it includes: an electric bed body 1, a transmission component 2, a mechanical arm 3, a storage box 4, and a recovery box 5.

[0058] Exemplarily, the first side may be two opposite sides in the long side direction or two opposite sides in the short side direction of the electric bed body. Optionally, Figure 1-1, the first side of the electric bed is the two sides opposite to each other in the short side direction, and the second side is any side except the first side. The first side of the electric bed is provided with a transmission component 2, and a retractable mechanical arm 3 is provided on the transmission component. The end of the mechanical arm can be tightened to a gripping state to clamp the bed sheet. The second side of the electric bed is provided with a storage box 4, and the storage box 4 is used to store bed sheets 41. The lid of the storage box is the bed side flap 12 of the electric bed, and the bed side flap is connected to the bed sheet opening slot 11. The mechanical arm 3 pulls out the clean bed sheet in the storage box from the bed sheet opening slot 11 to replace the bed sheet. Exemplarily, the opposite side of the storage box is a recycling box 5, which is used to store the replaced bed sheets.

[0059] For example, Figure 1-2 This is a side view of the system architecture proposed in an embodiment of the present application. As can be seen from the figure, the transmission component 2 is fixed on the first side of the electric bed, that is, the two opposite sides of the short side of the electric bed, by fixing metal. Of course, it can also be set on the two opposite sides of the long side.

[0060] Exemplarily, a transmission component 2 is provided on the first side of the electric bed, which is one of the core components for realizing automatic bed sheet changing. Optionally, the transmission component is a crawler, and optionally, the transmission component can also be a chain, which ensures the smoothness and accuracy of power transmission. Of course, the transmission component can also be a guide rail or other transmission device for carrying the movement of the mechanical part, which is not limited in the embodiment of the present invention. A retractable mechanical arm 3 is mounted on the transmission component, which can not only move in the horizontal direction, but also be adjusted in the vertical direction to adapt to mattresses and bedding of different thicknesses.

[0061] For example, the robot arm adopts a multi-degree-of-freedom joint design, allowing it to operate flexibly in complex environments. Each joint is equipped with a high-precision encoder to ensure the accuracy and repeatability of the action. The gripping end is designed with an appropriate clamping force, which can firmly grasp the sheets without damaging them. At the same time, the robot arm also has an overload protection mechanism to prevent damage in unexpected situations. In addition, the robot arm is equipped with sensors, such as tactile sensors and visual sensors, which can sense changes in the surrounding environment and adjust the action according to the actual situation; for example, when encountering obstacles, the robot arm will automatically slow down or change its path to avoid collision. In order not to generate noise, the motor and transmission system of the robot arm are optimized to reduce the noise level while maintaining high performance, allowing the robot arm to operate safely at night or in a silent environment.

[0062] For example, the end of the robot arm can be changed as needed, for example, from a clamping state to a grasping state. When in the grasping state, the robot arm can firmly clamp the edge of the sheet, and the built-in pressure sensor ensures appropriate clamping force, which will neither damage the fabric nor cause it to slip.

[0063] After understanding the system architecture of the method proposed in the embodiment of the present application, the execution process of the method is described in detail below. Figure 2-1 As shown, under the premise of the system architecture, the method includes the following steps:

[0064] Step 201: Detecting a bed sheet changing request;

[0065] Optionally, the system may periodically detect whether there is a request to change the bed sheets, and may also allow the user to input a change request instruction to ensure that all subsequent actions are triggered based on valid user instructions or preset conditions.

[0066] Exemplarily, the change request can be a user-initiated request. For example, a user can initiate a bed sheet change request in a variety of ways, such as through a smartphone application, a voice assistant (such as a smart speaker), or directly on a physical control panel next to the electric bed.

[0067] For example, it can also be triggered by a scheduled task, for example, if the user sets an automatic replacement cycle (e.g., once a week), the system's internal clock will automatically generate a bed sheet replacement request at a predetermined time. This arrangement is particularly suitable for families who want to reduce the burden of daily housework and maintain regular cleaning habits.

[0068] For example, it can also be triggered by sensors: various sensors installed on the electric bed (such as cameras, light sensors, etc.) can monitor the status of the sheets in real time. When obvious stains or other conditions that need to be replaced are detected on the sheets, the system can automatically trigger a replacement request based on a preset threshold. In addition, if the sensor detects that there is no one on the bed and meets the safety operation and sheet replacement conditions, it will also promote the generation of a replacement request.

[0069] Step 202: In response to the bed sheet replacement request, start the transmission component;

[0070] When the mechanical arm on the transmission component clamps the first bed sheet in the storage box, step 203 is executed, and the storage box stores clean bed sheets. The first bed sheet here can be understood as indicating a clean bed sheet.

[0071] Step 203: As the transmission component is driven, the robotic arm grasps the bed sheet and moves until the first bed sheet covers the body of the electric bed.

[0072] After receiving a valid bed sheet replacement request (step 201), proceed to step 202 and step 203, that is, in response to the request, the transmission component is started, and the clean bed sheet (first bed sheet) in the storage box is laid on the electric bed through the mechanical arm. Figure 2-2 to Figure 2-4This is an example of how the transmission component drives the robot to move:

[0073] For example, a manipulator transmission chain mechanism is provided at the head and foot of the bed, and a sheet slot is provided on the bed side flap 12. The manipulator is provided with a spring and a stretching mechanism. When the manipulator on one side of the transmission chain moves to the position of the sheet opening, the end of the manipulator arm is converted into a grasping state, ready to clamp the first sheet in the storage box. The left manipulator grasping part in the figure grasps the sheet, controls the left manipulator to grasp the sheet and lay it on the electric bed, and when the left manipulator reaches the preset position, the right manipulator in the figure grasps the sheet, and finally the manipulator is locked to complete the laying of the sheet.

[0074] Exemplarily, a fourth sensor is provided at the end of the robotic arm, and the end of the robotic arm is used to automatically tighten and clamp the bed sheet when the fourth sensor detects the presence of a bed sheet. The built-in pressure sensor monitors the gripping force to ensure that the bed sheet is neither damaged nor slipped. In order to increase the gripping force, the edge of the bed sheet can also be rolled. Optionally, a user can put the corners of the bed sheet into the end of the robotic arm, or the end of the robotic arm can automatically detect the bed sheet through a sensor, which is not limited in the embodiment of the present invention.

[0075] Optionally, when the robotic arm accurately touches the first bed sheet pre-stored in the storage box, it will firmly clamp the bed sheet, and the position of the end of the robotic arm and the placement of the bed sheet in the storage box allow the end of the robotic arm to touch the two corners or edges of the bed sheet, and the robotic arm is ready to pull it out of the storage box. As the transmission component continues to transmit, the robotic arm moves along a predetermined path, gradually pulling the bed sheet out of the storage box and moving toward the electric bed body. During this process, the robotic arm maintains appropriate tension to ensure that the bed sheet is stretched flat and wrinkle-free. The robotic arm fixes the four corners of the bed sheet at the corresponding positions of the electric bed in turn according to the pre-set action path, and finally the entire bed surface is completely covered with the new bed sheet.

[0076] To ensure the sheets are laid properly, the robotic arm may perform additional fine-tuning movements, such as gently pulling on certain parts of the sheet to ensure it lies flat and has no unwanted wrinkles.

[0077] When the clean sheets are successfully laid, a completion notification is sent to the user's mobile device to inform the user that the sheet replacement task has been successfully completed. In addition, a cleaning report can be provided, including the stain level assessment results, and a prompt message is output based on the stain assessment to prompt the user to change the sheets.

[0078] Exemplarily, in some possible embodiments, the electric bed body is provided with a second sensor. When the second sensor detects that the electric bed body is covered with a second bed sheet, the transmission component rotates to enable the mechanical arm to grab the second bed sheet and rotate to store the second bed sheet into a recycling box. When the rotation time of the transmission component reaches a preset rotation time, the rotation stops. The preset rotation time is the time it takes for all the second bed sheets to enter the recycling box.

[0079] Exemplarily, a rotating shaft is provided on a third side of the electric bed which is arranged opposite to the second side.

[0080] Exemplarily, the first side may be two long sides or two short sides. When the first side is two long sides, the second side is any one of the two short sides, and the third side is the other of the two short sides opposite to the second side. A first sensor is arranged on the rotating shaft, and the mechanical arm grasps the first bed sheet and moves until the bed sheet is covered on the body of the electric bed. Figure 3 As shown, the method further comprises the following steps:

[0081] Step 301: when the mechanical arm grasps the first bed sheet and contacts the rotating shaft, the transmission component is paused, and the end of the mechanical arm changes from the grasping state to the unfolding state to release the clamping of the first bed sheet;

[0082] Exemplarily, the core part of the shaft is a solid cylindrical shaft body, usually made of metal (such as stainless steel or aluminum alloy) to ensure sufficient strength and durability. The surface of the shaft body is specially treated to increase friction and help better wrap the sheets. The bearings at both ends of the shaft body allow the shaft to rotate smoothly, reduce friction and improve rotation efficiency. The quality of the bearings directly affects the service life and performance of the shaft. The shaft is driven by a motor, which is connected to the shaft body and transmits power through gears or other transmission devices. The selection of the motor needs to consider factors such as torque, speed and noise to ensure that the shaft can work efficiently and quietly. In addition, the shaft is equipped with a first sensor (such as an optical sensor, a pressure sensor, etc.) for monitoring the position and winding state of the sheets. These sensors help ensure that the shaft can start or stop at the right time and prevent over-winding or under-winding.

[0083] When it is detected that the robot arm contacts the rotating shaft on the side opposite to the storage box side (clean sheets), it means that the sheets have been laid on the electric bed, and the end of the robot arm releases the first sheet.

[0084] Exemplarily, after the end of the robotic arm changes from the grasping state to the unfolded state, the method further includes:

[0085] Continue to start the transmission component, and when the transmission component drives the mechanical arm to reset, the transmission component stops transmission.

[0086] Step 302: When the first sensor of the rotating shaft detects contact with the bed sheet, the rotating shaft is started to rotate to wrap the first bed sheet portion around the rotating shaft;

[0087] Exemplarily, the first sensor may be a physical tactile sensor (limit switch or micro switch) or a capacitive proximity sensor, which detects the presence of an object based on changes in the electric field. When the bed sheet approaches or contacts the rotating shaft, the local electric field distribution is changed, and the sensor determines the position of the bed sheet accordingly. In the embodiment of the present application, there is no restriction on the type of sensor, which can be optimized according to actual conditions.

[0088] Step 303: When the rotation time reaches a first preset time length, the rotating shaft stops rotating.

[0089] The first preset time is the time that the sheet part is wound on the reel. The part of the sheet wound on the reel is a very small part of the sheet, such as the edge part, so as to fix the first sheet to prevent the sheet from moving. Therefore, the time required for this part to be wound on the rotating shaft is obtained through preliminary testing and is used as the first preset time.

[0090] Before changing to clean sheets, you need to replace the old or stained sheets. The following is a detailed description of how to replace them.

[0091] In some possible embodiments, the electric bed body is provided with a second sensor, a portion of the second bed sheet is wound around the rotating shaft, and before the transmission component is started, Figure 4 As shown, the method also includes:

[0092] Step 401: when the second sensor detects that the electric bed body is covered with a second bed sheet, the rotating shaft is started to allow the second bed sheet to be wound around the rotating shaft;

[0093] Exemplarily, the second sensor may be a pressure sensor, a photosensor, or a camera device, and the embodiments of the present application do not limit this.

[0094] Step 402: When the rotation time of the rotating shaft reaches a second preset time, the rotating shaft stops rotating, wherein the second preset time is a preset minimum time required for the second bed sheet to be completely wrapped around the rotating shaft, and the second preset time is greater than the first preset time.

[0095] For example, in order to ensure that the second sheet can be completely wound around the shaft, a "second preset time" is set. This time is adjusted in advance based on experimental data and actual usage, with the goal of allowing the shaft to rotate for enough time to completely roll up the entire second sheet. Since the second sheet is the sheet that needs to be replaced, it should be completely wound around the reel to ensure the complete replacement of the first sheet (clean sheet). Therefore, the second sheet is usually longer than the first sheet or needs to be more completely wound, so the second preset time is greater than the first preset time.

[0096] In the embodiment of the present application, when the second bed sheet is wound on the reel to a certain length, it should be put into the recycling box. For example, the third side of the electric bed is provided with a recycling box, and the rotating shaft is provided above the recycling box. Figure 5 As shown, the method also includes:

[0097] Step 501: Detecting through the first sensor according to a preset detection cycle whether the thickness of the bed sheet wrapped around the rotating shaft exceeds a preset thickness threshold;

[0098] For example, the second sensor is activated according to a preset detection cycle (for example, every day or after each bed sheet change) to monitor the thickness of the bed sheet wrapped on the rotating shaft. This cycle can be adjusted according to user settings or system defaults to adapt to different usage frequencies and needs.

[0099] For example, the second sensor can be an ultrasonic sensor, an optical sensor, or other technology that can accurately measure the thickness of an object. It will continuously monitor the thickness of the sheet wrapped around the surface of the rotating shaft to ensure the accuracy and real-time nature of the data.

[0100] For example, each time a test is completed, the currently measured thickness of the bed sheet is compared with a preset thickness threshold value. The preset thickness threshold value is set based on the maximum load capacity of the shaft and the convenience of subsequent processing, in order to prevent the shaft from being overloaded or affecting system performance.

[0101] Step 502: When the thickness of the bed sheet wrapped around the rotating shaft exceeds a preset thickness threshold, the rotating shaft starts to rotate in a direction opposite to the direction of wrapping the bed sheet, so that the wrapped bed sheet is at least partially stored in the recycling box.

[0102] If the thickness of the sheets wrapped around the spindle is detected to exceed a preset threshold, the system will take immediate action to avoid overloading the spindle and affecting its normal operation, and to ensure that the sheets can be recycled in time.

[0103] Exemplarily, the rotating shaft rotates in the direction opposite to the direction of winding the bed sheet. This reverse rotation causes the bed sheet that has been wound on the rotating shaft to gradually loosen and move toward the recycling box.

[0104] As the spindle turns in the opposite direction, the sheets are directed to a recycling bin on the second side. The recycling bin should be designed to have enough capacity to hold multiple old sheets and may have internal dividers to allow for different types of sheets or sheets with different levels of soiling.

[0105] Exemplarily, the recycling box and the storage box are both provided with a third sensor, such as Figure 6 As shown, the method also includes:

[0106] Step 601: Detecting through a third sensor in the recycling box that the weight of the bed sheets in the recycling box exceeds a first preset weight threshold, outputting a first prompt message;

[0107] Exemplarily, in order to ensure the efficient operation of the electric bed and the convenience of the user, the system will output a prompt message under certain conditions to remind the user to dispose of the sheets in the recycling box and storage box in time. When the weight of the sheets in the recycling box exceeds the preset first weight threshold, the system will output a first prompt message to remind the user to take out the changed sheets in the recycling box in time. The prompt message may include a title "The recycling box is full, please clean it in time" and a description "The weight of the dirty sheets in your recycling box has exceeded the safety threshold. It is recommended that you take them out and wash these sheets as soon as possible." Operational suggestions include immediately opening the recycling box to take out all dirty sheets for washing. If help is needed, you can contact housekeeping or use the quick wash mode of the washing machine. Additional information provides a link to the nearest laundry or dry cleaner's location and reminds the user to check the status of the recycling box regularly.

[0108] For example, the first prompt message may be: The recycling bin is full, please clean it in time. The weight of the dirty sheets in your recycling bin has exceeded the safety threshold. It is recommended that you take out and wash these sheets immediately to maintain the normal operation and sanitary conditions of the system. The first prompt message may be text, voice, or a piece of music, which is not limited in the embodiment of the present invention.

[0109] Step 602: When the third sensor in the storage box detects that the weight of the sheets in the storage box is less than a second preset weight threshold, a second prompt message is output.

[0110] Similarly, when the weight of the sheets in the storage box is lower than the preset second weight threshold, the system will output a second prompt message to remind the user to replenish new or clean sheets in time to avoid a lack of clean sheets when replacing the sheets. The prompt message includes the title "Insufficient inventory in the storage box, please replenish clean sheets", and the description is "The number of clean sheets in your storage box is insufficient. It is recommended that you replenish new or clean sheets as soon as possible to ensure that there is sufficient inventory when you change the sheets next time." Operational suggestions include immediately checking the storage box and adding enough clean sheets. If you need to buy new sheets, you can place an order through the recommended shopping platform. Additional information provides links to nearby stores or online shopping platforms, and reminds users to set automatic replenishment reminders to ensure that sufficient inventory is maintained for a long time. Similarly, the second prompt message can be text, voice, or a piece of music, which is not limited in the embodiments of the present invention.

[0111] For example, the second prompt message is as follows: The storage box is insufficient, please add clean sheets. The number of clean sheets in your storage box has fallen below the minimum threshold. It is recommended that you check the storage box immediately and add enough clean sheets to ensure that there is enough stock when you change the sheets next time.

[0112] Through the design of the above-mentioned second prompt information, the electric bed can not only effectively remind users to dispose of bedding in time, but also provide practical help and guidance, improving the user experience and the intelligence level of the system. The design principle of the second prompt information emphasizes simplicity, operation orientation, personalized service and preventive suggestions, ensuring that users can quickly obtain key information and take action, while obtaining personalized help and service options to avoid possible problems in the future.

[0113] Before automatically changing bed sheets mentioned in the embodiment of the present application, in addition to manually determining whether bed sheets need to be changed, the cleanliness of the bed sheets can also be automatically detected, and when the cleanliness meets the conditions for changing the bed sheets, the automatic changing program can be started.

[0114] In some possible embodiments, the second sensor is a plurality of light-sensitive sensors, such as Figure 7 As shown, the method also includes:

[0115] Step 701: obtaining a stain distribution image of the bed sheet on the electric bed through the multiple photosensitive sensors, and performing image recognition on the stain distribution image to obtain the stain distribution position and size;

[0116] For example, a plurality of light sensors (second sensors) are provided on the electric bed, and these sensors can be distributed in different positions of the bed to ensure that the entire bed surface can be fully covered. Each light sensor has high sensitivity and can detect small changes in light, thereby capturing stains or abnormal light spots on the sheets.

[0117] Exemplarily, the electric bed is provided with a light source, and the step of obtaining the stain distribution image of the bed sheet of the electric bed through the multiple photosensitive sensors includes:

[0118] When the sheets on the electric bed are irradiated by a light source according to a preset period, an area where the light intensity of the light source received by the photosensitive sensor is lower than a preset threshold is judged as a target area where stains exist, and a stain distribution image of the sheets on the electric bed is obtained based on the target areas identified by multiple photosensitive sensors.

[0119] For example, at a preset period (e.g., every morning or before changing the bed sheets), the system activates the light source on the electric bed to illuminate the entire bed surface. The light source may be an ultraviolet lamp or other light source of a specific wavelength that can cause organic matter to fluoresce. When the light source irradiates the bed sheets, the clean bed sheet area will reflect uniform and strong light, while the area with stains absorbs part of the light or fluoresces due to the organic matter in the stains, resulting in the light intensity in the area being lower than the preset threshold.

[0120] When the light source shines on the bed sheet, the photosensitive sensor monitors the light intensity received in each area in real time. For those areas where the light intensity received is lower than the preset threshold, the system determines it as the target area where stains exist. This is because the organic matter in the stains (such as sweat stains, dandruff, etc.) will emit different intensities of fluorescence under ultraviolet light, or because the stains block part of the light, causing the light intensity in these areas to be significantly reduced.

[0121] Based on the target area identified by multiple light-sensitive sensors, the data of each sensor is comprehensively analyzed to generate a detailed stain distribution image. This process may include but is not limited to edge detection, color recognition, and shape analysis technologies to accurately depict the location, scope, and severity of the stain. In addition, cameras under ordinary visible light can also assist in capturing the overall condition of the sheets, and combined with ultraviolet detection results to form a more complete stain distribution image to ensure a comprehensive assessment of the sheet status.

[0122] Step 702: When the size of the stain distribution exceeds a preset size threshold, or the position of the stain distribution is located in a preset area, output a third prompt message.

[0123] The third prompt information may be information prompting the user to change bed sheets, and may be text, voice or audio prompt, which is not limited in the embodiment of the present invention.

[0124] According to the analysis in step 701, if the identified stain area exceeds the preset size threshold, it indicates that the stain is serious and needs to be dealt with immediately.

[0125] For example, stains in certain specific areas (such as areas near the head or areas with frequent body contact) may have a greater impact on the user's health, so preset areas can be set. If stains appear in these areas, even if the area is not large, a prompt may be triggered.

[0126] Exemplarily, when any of the above conditions is met, the electric bed sends a third prompt message to the user's mobile device. The prompt message may include: the location and size of the stain; a suggestion to change the bed sheets or take other cleaning measures as soon as possible; a suggestion for cleaning or the option to contact a cleaning service; and, exemplarily, a stain composition analysis result may also be provided to help the user understand the source of the stain and take preventive measures.

[0127] For example, in order to more accurately manage and handle the cleaning problems of bedding, electric beds can set different stain levels according to the nature and severity of the stains, which not only helps users understand the condition of the sheets, but also guides the system's automated operations, such as whether the sheets need to be replaced immediately or spot cleaned. First, a clear set of stain level standards needs to be defined, which should be based on factors such as the type, size, and location of the stains.

[0128] Exemplarily, common stain levels can be divided into the following categories: Level 1 (minor stains) include small amounts of dust, hair or other tiny particles. Such stains usually do not have a direct impact on health, but may affect the appearance of the sheets; Level 2 (moderate stains) involves visible sweat stains, dandruff or other organic matter. Although such stains can be removed by regular washing, they may cause skin allergies and other problems if accumulated for a long time; Level 3 (serious stains) refers to obvious liquid leakage (such as drinks, food), blood, vomit and other difficult-to-clean stains. These stains not only affect sanitary conditions, but may also cause damage to the mattress or odor; Level 4 (emergency) When large-scale contamination or harmful substances (such as chemical leaks) are detected, the system should take immediate action and notify the user for special treatment.

[0129] Exemplarily, the judgment basis is preset to distinguish different levels of stains. The data of the photosensitive sensor and other auxiliary information (such as camera images) can be combined. For example: the area covered by the stain is calculated through an image recognition algorithm. If the stain area is less than 5 square centimeters, it is classified as level one; between 5 and 20 square centimeters is level two; more than 20 square centimeters is level three and above. The ultraviolet fluorescence characteristics are used to analyze the stain composition. In the case of strong fluorescence of organic matter, or when abnormal chemicals are detected, it is directly classified as level three or level four. The severity of the stain is assessed by comparing the color and brightness differences between the stained area and the surrounding sheets. Significant color changes or reduced brightness may be signs of severe stains.

[0130] For example, in order to more accurately manage and handle the cleanliness issues of bedding, the electric bed can set different stain levels according to the nature and severity of the stains, and provide corresponding treatment suggestions to help users maintain a clean and healthy sleeping environment.

[0131] For example, for level one (light stains), it is recommended to wash during the next normal wash cycle; if the user wants to keep the sheets in the best condition, they may consider manually cleaning these light stains in advance.

[0132] For example, although secondary stains (medium stains) can be removed through regular washing, if they accumulate for a long time, they may cause skin allergies and other problems. It is recommended to put the sheets into the washing machine for cleaning as soon as possible to prevent the stains from solidifying or bacteria from breeding. You can choose to use a mild detergent and select the appropriate washing mode as needed. For smaller stains, you can first wipe them gently with a damp cloth or use a special stain pre-treatment product before cleaning the entire area.

[0133] For example, Level 3 (serious stains), these stains not only affect sanitary conditions but may also cause damage to the mattress or produce odors. It is recommended to replace the contaminated sheets immediately and wash them separately, using a strong detergent and high-temperature washing mode to ensure thorough cleaning. If the stains have penetrated into the mattress, it is recommended to clean or treat the surface of the mattress at the same time. For particularly stubborn stains or odors, it may be necessary to contact a professional cleaning service for deep cleaning.

[0134] Exemplarily, level 4 (emergency) should take immediate action and notify the user for special handling. For sheets that are severely contaminated or contaminated with harmful substances, it is recommended to discard them immediately and do not try to wash them to avoid harm to human health. Wear appropriate protective equipment (such as gloves, masks) when handling contaminated items, and properly dispose of waste in accordance with local regulations. Perform comprehensive disinfection on the affected areas, including mattresses and other contact surfaces, to ensure that all potential harmful substances are removed. Through the above method, the electric bed can not only efficiently and accurately evaluate the cleanliness of bedding, but also provide users with further processing suggestions to help them take appropriate measures in time to maintain a clean and healthy sleeping environment. This grading mechanism improves the intelligence level of the system, enhances user experience and convenience, and also promotes the formation of personal hygiene habits.

[0135] It should be understood that, although the various steps in the flowcharts of Fig. 2-7 are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in Fig. 2-7 may include a plurality of sub-steps or a plurality of stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these sub-steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the sub-steps or stages of other steps.

[0136] In some embodiments, Figure 8 As shown, a device for automatically changing bed sheets is provided, which is applied to an electric bed, wherein the electric bed comprises an electric bed body, a first side and a second side, wherein the first side is two sides opposite to each other in the long side direction or the short side direction of the electric bed body, and the second side is any side other than the first side, wherein the first side of the electric bed is provided with a transmission component, and a retractable mechanical arm is provided on the transmission component, and the end of the mechanical arm can be tightened to a gripping state to clamp the bed sheet, and the second side of the electric bed is provided with a storage box, and the storage box is used for storing bed sheets and comprises: a detection module 801, a replacement module 802, wherein:

[0137] A detection module, used to detect a bed sheet change request;

[0138] The replacement module is used to respond to the bed sheet replacement request and start the transmission component. When the mechanical arm on the transmission component clamps the first bed sheet in the storage box, as the transmission component is driven, the mechanical arm grasps the bed sheet and moves until the first bed sheet covers the body of the electric bed.

[0139] For further definition of the automatic bed sheet changing device, please refer to the definition of the automatic bed sheet changing method above, which will not be repeated here. Each module in the above device can be implemented in whole or in part by software, hardware and their combination. Each of the above modules can be embedded in or independent of the processor in the terminal device in the form of hardware, or can be stored in the memory of the terminal device in the form of software, so that the processor can call and execute the operations corresponding to each of the above modules.

[0140] For example, Fig. 9 This is a schematic block diagram of another automatic bed sheet changing device provided in an embodiment of the present application.

[0141] Fig. 9The device 900 shown is composed of four main parts: processor 901, memory 902, communication interface 903 and bus 904. Each part has its specific function and role, and these components and their functions in the method of automatically changing bed sheets will be explained in detail below.

[0142] In the automatic bed sheet changing device 900, the processor 901 serves as the core control unit and is responsible for executing all logical operations and decision making. It coordinates the work of various hardware components according to preset algorithms and user instructions, analyzes the state of the bed sheet through built-in or externally connected image recognition algorithms and stain level assessment systems, and plans and controls the motion path of the robot arm, the operation of the rotating shaft, and the temporary shifting and resetting of bedding items (such as quilts and pillows).

[0143] Memory 902 not only stores the operating system, application code, and various algorithm models for changing sheets, but also temporarily stores data collected from sensors, such as sheet images and stain detection results, so that the processor can quickly access and process them; in addition, it stores user preference settings (such as frequency of changing and washing sheets), equipment operation logs, cleaning reports and other information for a long time to support subsequent inquiries and service improvements.

[0144] The communication interface 903 provides an efficient internal data exchange channel to ensure timely and accurate instruction delivery, allowing the device to establish a connection with the user's mobile device via Wi-Fi, Bluetooth or other wireless / wired network protocols, receive remote control commands and provide feedback information to the user, such as replacement progress notifications and fault alarms; if necessary, it can also connect to the cloud server via the Internet to obtain the latest firmware updates or participate in a wider home smart ecosystem.

[0145] Bus 904 serves as the physical medium connecting all components and is responsible for transmitting power, data signals and other control signals to ensure that all parts work synchronously and do not interfere with each other. It also has certain flexibility and scalability to accommodate new functional modules or upgrade requirements that may be added in the future, thereby ensuring stable operation and efficient collaboration of the system.

[0146] In actual applications, these four components work closely together to realize the function of automatic bed sheet changing. When the user starts the bed sheet changing program, the processor 901 will first check the current state of the bed surface and make a preliminary judgment based on the information sent back by the sensor. Then, it will instruct the robot arm to start operating according to the predetermined path, and use the communication interface 903 to maintain real-time interaction with the user-end device to let the user know the latest progress. During this process, any data generated will be temporarily stored in the memory 902 for further processing; and the bus 904 ensures that the information in the entire process flows smoothly and maintains the stable operation of the system.

[0147] Through such a highly integrated and intelligent design, the device not only simplifies the traditional process of changing bed sheets and improves efficiency, but also enhances the user experience, reflecting the advancement of smart home technology.

[0148] It should be understood that in the embodiments of the present application, the processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0149] In the implementation process, each step of the above method can be completed by an integrated logic circuit of hardware in a processor or an instruction in the form of software. The steps of the method disclosed in conjunction with the embodiment of the present application can be directly embodied as a hardware processor for execution, or a combination of hardware and software modules in a processor for execution. The software module can be located in a storage medium mature in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in a memory, and the processor executes the instructions in the memory, and completes the steps of the above method in conjunction with its hardware. To avoid repetition, it is not described in detail here.

[0150] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the embodiments of the present application.

[0151] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0152] In the several embodiments provided in the embodiments of the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0153] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0154] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0155] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program code.

[0156] The above is only a specific implementation of the embodiment of the present application, but the protection scope of the embodiment of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the embodiment of the present application, which should be included in the protection scope of the embodiment of the present application. Therefore, the protection scope of the embodiment of the present application should be based on the protection scope of the claims.

Claims

1. A method for automatically changing bed sheets, characterized in that: Applied to an electric bed, the electric bed comprises an electric bed body, a first side and a second side, the first side is two sides opposite to each other in the long side direction or the short side direction of the electric bed body, the second side is any side other than the first side, the first side of the electric bed is provided with a transmission component, the transmission component is provided with a retractable mechanical arm, the end of the mechanical arm can be tightened to a gripping state to clamp a bed sheet, the second side of the electric bed is provided with a storage box, the storage box is used to store the bed sheet, and the method comprises: Detect bed linen change requests; In response to the request to change the bed sheet, the transmission component is started, and the mechanical arm on the transmission component clamps the first bed sheet in the storage box. As the transmission component is driven, the mechanical arm grasps the bed sheet and moves until the first bed sheet covers the body of the electric bed.

2. The method according to claim 1, characterized in that The electric bed is provided with a rotating shaft on a third side opposite to the second side, and a first sensor is provided on the rotating shaft. After the mechanical arm grasps the first bed sheet and moves until the bed sheet covers the body of the electric bed, the method further includes: When the mechanical arm grasps the first bed sheet and contacts the rotating shaft, the transmission component is paused, and the end of the mechanical arm changes from a grasping state to an unfolded state to release the clamping of the first bed sheet; When the first sensor of the rotating shaft detects contact with the bed sheet, the rotating shaft is started to rotate so as to wrap the first bed sheet portion around the rotating shaft; When the rotation time reaches a first preset time length, the rotating shaft stops rotating.

3. The method according to claim 2, characterized in that The electric bed body is provided with a second sensor, a portion of the second bed sheet on the electric bed is wound around the rotating shaft, and before starting the transmission component, the method further includes: When the second sensor detects that the electric bed body is covered with the second bed sheet, the rotating shaft is started to wind the second bed sheet around the rotating shaft; When the rotation time of the shaft reaches a second preset time length, the shaft stops rotating, wherein the second preset time length is a preset minimum time length required for the second bed sheet to be completely wrapped around the shaft, and the second preset time length is greater than the first preset time length.

4. The method according to claim 2, characterized in that: The third side of the electric bed is provided with a recycling box, the rotating shaft is provided above the recycling box, and the method further comprises: detecting, by the first sensor according to a preset detection cycle, whether the thickness of the bed sheet wrapped around the rotating shaft exceeds a preset thickness threshold; When the thickness of the bed sheet wrapped around the rotating shaft exceeds a preset thickness threshold, the rotating shaft starts to rotate in a direction opposite to the direction of wrapping the bed sheet, so that the wrapped bed sheet is at least partially stored in the recycling box.

5. The method according to claim 4, characterized in that The recycling box and the storage box are both provided with a third sensor, and the method further comprises: When a third sensor in the recycling box detects that the weight of the bed sheet in the recycling box exceeds a first preset weight threshold, a first prompt message is output; When the third sensor in the storage box detects that the weight of the sheets in the storage box is less than a second preset weight threshold, a second prompt message is output.

6. The method according to claim 3, characterized in that The second sensor is a plurality of light-sensitive sensors, and the method further comprises: Obtaining a stain distribution image of the bed sheet of the electric bed by using the multiple photosensitive sensors, and performing image recognition on the stain distribution image to obtain the stain distribution position and size; When the size of the stain distribution exceeds a preset size threshold, or the position of the stain is located in a preset area, a third prompt information is output.

7. The method according to claim 6, characterized in that The electric bed is provided with a light source, and the stain distribution image of the bed sheet of the electric bed is obtained by the multiple photosensitive sensors, including: When the sheets on the electric bed are irradiated by a light source according to a preset period, an area where the light intensity of the light source received by the photosensitive sensor is lower than a preset threshold is judged as a target area where stains exist, and a stain distribution image of the sheets on the electric bed is obtained based on the target areas identified by multiple photosensitive sensors.

8. The method according to claim 1, characterized in that: The transmission component is a crawler belt.

9. A device for automatically changing bed sheets, characterized in that: Applied to an electric bed, the electric bed comprises an electric bed body, a first side and a second side, the first side is two sides opposite to each other in the long side direction or the short side direction of the electric bed body, the second side is any side other than the first side, the first side of the electric bed is provided with a transmission component, the transmission component is provided with a retractable mechanical arm, the end of the mechanical arm can be tightened to a gripping state to clamp a bed sheet, the second side of the electric bed is provided with a storage box, the storage box is used to store bed sheets, and includes: A detection module, used to detect a bed sheet change request; The replacement module is used to respond to the bed sheet replacement request and start the transmission component. When the mechanical arm on the transmission component clamps the first bed sheet in the storage box, as the transmission component is driven, the mechanical arm grasps the bed sheet and moves until the first bed sheet covers the body of the electric bed.

10. An electric bed, characterized in that: The electric bed comprises an electric bed body, a first side and a second side, wherein the first side is the two sides opposite to each other in the long side direction or the two sides opposite to each other in the short side direction of the electric bed body, and the second side is any side other than the first side, the first side of the electric bed is provided with a transmission component, the transmission component is provided with a retractable mechanical arm, the end of the mechanical arm can be tightened to a gripping state to clamp the bed sheet, the second side of the electric bed is provided with a storage box, the storage box is used to store the bed sheet, the electric bed also comprises a device for automatically changing the bed sheet, and the device for automatically changing the bed sheet comprises: processor; a memory for storing instructions executable by the processor; Wherein, the processor is configured to execute the instructions to implement a method for automatically changing bed sheets as described in any one of claims 1-8.

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