A sleep bed with softness adjustment based on piezoelectric sensing

Abstract

This invention relates to the field of sleep bed technology and proposes a piezoelectric sensing-based adjustable sleep bed, including a bed frame assembly comprising a base and a support assembly disposed above the base; the support assembly contains multiple airbags and integrates a piezoelectric sensor for collecting human vital signs data; a control assembly, either separate from or integrated with the bed frame assembly, utilizes the piezoelectric sensor and airbags to dynamically convert the pressure of the human torso, waist, and legs into electrical signals when lying down. After being processed by a charge amplifier and the main control board, the control unit controls the negative pressure regulating box to independently inflate or deflate the corresponding airbags, thereby changing the support firmness of each area in real time. This allows the bed surface to actively conform to the physiological curvature of the human body and evenly distribute body pressure, avoiding poor blood circulation caused by concentrated local pressure, significantly improving sleep comfort, and solving the problems of insufficient comfort and intelligence in existing technologies.

Description

Technical Field

[0001] This invention relates to the field of sleep bed technology, specifically to a sleep bed with adjustable firmness based on piezoelectric sensing. Background Technology

[0002] Currently, most sleeping beds on the market use a fixed-firm bed board in conjunction with a mattress, or employ individually pocketed springs arranged in zones for support. However, during sleep, different parts of the body have significantly different needs for support firmness, which dynamically changes with changes in sleeping position. Existing fixed-firm structures cannot sense the pressure distribution under the body's lying position in real time, nor can they actively and in real-time adjust the firmness of the support in different zones of the bed based on this pressure distribution. Some nursing beds with adjustable functions mostly limit their adjustment methods to changing the overall bending angle of the bed board through mechanical linkages or electric push rods to achieve back raising or leg bending movements. However, this type of adjustment does not involve changes in the firmness of the bed surface support layer and cannot solve the problem of excessive pressure on certain parts of the body leading to poor blood circulation.

[0003] Furthermore, existing adjustable inflatable mattresses typically rely on manual operation of the air pump for inflation control, which is cumbersome and lacks real-time data feedback, leading to unpredictable adjustments. In terms of functional integration, the air and electrical connections between the existing mattress frame and control unit are mostly independent and fragmented interfaces, resulting in complicated connection steps and low reliability. Simultaneously, existing products lack systematic technical solutions for equipment heat dissipation, piping organization, overall component mobility, and the output of vital sign data to external devices, resulting in insufficient overall ease of use and level of intelligence. Summary of the Invention

[0004] This invention proposes a piezoelectric sensing-based adjustable firmness sleeping bed, which solves the problems of insufficient comfort and lack of intelligence in related technologies.

[0005] The technical solution of the present invention is as follows: a piezoelectric sensing-based adjustable firmness sleep bed, including a bed frame assembly, comprising a base and a support assembly disposed above the base; the support assembly is provided with multiple airbags, and the support assembly is integrated with a piezoelectric sensor for collecting human vital signs data; The control component, which is separate from or integrated with the bed assembly, is used to receive signals from the piezoelectric sensor and control the inflation amount of each airbag according to the signals to adjust the firmness of the bed.

[0006] As a preferred embodiment of the present invention, the base includes a bottom frame and omnidirectional wheels disposed at the bottom of the bottom frame.

[0007] As a preferred embodiment of the present invention, the base is provided with a connector, and the bottom of the control component is provided with a drive caster wheel; the control component is detachably connected to the bed component through the connector.

[0008] In a preferred embodiment of the present invention, an adjustment assembly is provided between the support assembly and the base; the adjustment assembly includes a leg adjustment cylinder and a leg hinge adjustment shaft for driving the leg support plate to bend, and an upper torso adjustment cylinder and an upper torso hinge adjustment shaft for driving the torso support plate to bend.

[0009] As a preferred embodiment of the present invention, the control component includes a negative pressure regulating box, which is provided with at least one inflation connection port for connecting to the airbag tubing.

[0010] As a preferred embodiment of the present invention, the negative pressure regulating box is further provided with an air inlet / outlet and a pipe head placement rack.

[0011] As a preferred embodiment of the present invention, the control component is provided with an external component, which includes a data connector and a cable connector.

[0012] As a preferred embodiment of the present invention, the control component is further provided with a display panel for displaying working status and vital sign data, as well as multiple control buttons.

[0013] In a preferred embodiment of the present invention, the base of the bed assembly is integrated with an inflation connector and a power connector, and the control assembly is connected to the inflation connector and the power connector via a quick-connect fitting to achieve the connection of the air circuit and the electrical circuit.

[0014] As a preferred embodiment of the present invention, there are multiple piezoelectric sensors, which are respectively arranged in the areas of the support assembly corresponding to the waist, back and legs of the human body; the support assembly also includes a waist fixing block located in the middle.

[0015] The working principle and beneficial effects of this invention are as follows: This invention utilizes piezoelectric sensors and airbags to dynamically convert the pressure of the human torso, waist, and legs into electrical signals when the person is lying down. After being processed by a charge amplifier and the main control board, the negative pressure regulating box is controlled to independently inflate or deflate the corresponding airbags, thereby changing the support firmness of each area in real time. This allows the bed surface to actively conform to the physiological curvature of the human body and evenly distribute body pressure, avoiding poor blood circulation caused by concentrated local pressure and significantly improving sleep comfort.

[0016] This invention, through the design of a display panel and external data connector, allows the display panel to present the air pressure value and pressure distribution map of the airbag in real time. The main control board encodes the collected and processed vital sign data and outputs it to external monitoring equipment via the external data connector, realizing remote data interaction and intelligent monitoring. At the same time, manual intervention can be performed in conjunction with control buttons, forming a closed-loop control of the entire process from sensing, adjustment, display to data sharing. This avoids the blindness of traditional manual inflation adjustment and improves the convenience of use and the level of intelligent management. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the control component of the present invention; Figure 3 This is a side view of the overall structure of the control component of the present invention; Figure 4 This is a schematic diagram of the overall structure of the bed assembly of the present invention; Figure 5 This is a bottom view of the overall structure of the bed assembly of the present invention.

[0019] In the diagram: 1. Control component; 11. Negative pressure regulating box; 111. Air inlet / outlet; 112. Pipe head placement rack; 113. Inflation connection port; 12. External component; 121. Data connector; 122. Cable connector; 13. Drive caster wheel; 14. Display panel; 15. Control buttons; 2. Bed frame components; 21. Base; 211. Bottom frame; 212. Casters; 213. Connector; 214. Inflatable connector; 215. Power connector; 22. Adjustment assembly; 221. Leg adjustment cylinder; 222. Leg hinge adjustment shaft; 223. Leg adjustment plate; 224. Upper torso adjustment cylinder; 225. Upper torso hinge adjustment shaft; 226. Upper torso adjustment plate; 23. Support assembly; 231. Waist fixation block; 232. Torso support plate; 233. Leg support plate; 234. Airbag; 235. Piezoelectric sensor. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention. Example

[0021] like Figures 1-5 As shown, a piezoelectric sensing-based adjustable firmness sleep bed includes a bed frame assembly 2, which includes a base 21 and a support assembly 23 disposed above the base 21; the support assembly 23 is provided with multiple airbags 234, and the support assembly 23 is integrated with a piezoelectric sensor 235 for collecting human vital signs data. The control component 1, which is separate from or integrated with the bed component 2, is used to receive signals from the piezoelectric sensor 235 and control the inflation of each airbag 234 according to the signals to adjust the firmness of the bed.

[0022] A piezoelectric sensing-based adjustable-firm sleeping bed includes a bed frame assembly 2 and a control assembly 1. The base 21 of the bed frame assembly 2 is placed on the ground, and a support assembly 23 is installed above the base 21. Multiple airbags 234 are integrated inside the support assembly 23, and the airbags 234 are connected to an air source via tubing. A piezoelectric sensor 235 is sewn or embedded under the surface skin of the support assembly 23, directly sensing pressure changes exerted by the human body on the bed surface and converting them into electrical signals. The signal lines of the piezoelectric sensor 235 are connected to a signal processing circuit within the control assembly 1. The control assembly 1 is independently located on one side of the bed frame. Its internal main control board receives the signals output by the piezoelectric sensor 235, filters and compares them, and calculates the pressure distribution at different parts of the body. Based on the pressure distribution data, the main control board sends commands to the air pump and solenoid valve assembly to inflate or deflate the airbags 234 in the corresponding areas. By changing the inflation level of the airbags 234, the firmness of the support in that area is adjusted, achieving closed-loop regulation.

[0023] The base 21 includes a bottom frame 211 and casters 212 disposed at the bottom of the bottom frame 211.

[0024] The base frame 211 is a rectangular frame structure welded from metal square tubing. Four casters 212 are bolted to the bottom corners of the base frame 211. The caster frames 212 have built-in rolling bearings, and are rotatably connected to the base plate of the base frame 211 via a vertical axis, allowing the wheels to freely rotate around the vertical axis. When the bed needs to be moved, the bed assembly 2 is pushed directly; the thrust is transmitted through the base frame 211 to the casters 212. The wheels overcome ground friction through the rolling motion of the bearings, causing the entire bed to shift. The casters 212 are also equipped with foot-operated brake pads. Depressing the brake pads presses them against the wheel surface, locking the wheel's rotation and maintaining a fixed work position.

[0025] The base 21 is provided with a connector 213, and the bottom of the control component 1 is provided with a drive universal wheel 13; the control component 1 is detachably connected to the bed component 2 through the connector 213.

[0026] The bottom frame 211 of the base extends outward from the side with a cantilevered connector 213. The connector 213 has a slot structure with a guide bevel, and a positioning recess is provided at the bottom of the slot. Correspondingly, the bottom housing of the control component 1 is equipped with four drive casters 13, whose wheel frame structure is the same as the travel casters 212. The side wall of the control component 1 has hooks that match the slots of the connector 213. During transmission, pushing the control component 1 causes the hooks to slide into the slots of the connector 213, and the positioning pin automatically falls into the recess to lock. The control component 1 is then connected to the bed component 2 through the connector 213, achieving synchronous pushing. When separation is required, stepping on the unlocking pedal lifts the positioning pin, and pulling it out in the opposite direction is sufficient.

[0027] An adjustment assembly 22 is provided between the support assembly 23 and the base 21; the adjustment assembly 22 includes a leg adjustment cylinder 221 and a leg hinge adjustment shaft 222 for driving the leg support plate 233 to bend, and an upper torso adjustment cylinder 224 and an upper torso hinge adjustment shaft 225 for driving the torso support plate 232 to bend.

[0028] An adjustment assembly 22 is installed between the support assembly 23 and the base 21. The tail end of the leg adjustment cylinder 221 of the adjustment assembly 22 is hinged to the crossbeam in the middle of the base 21, and the piston rod end is connected to the lower end face of the leg support plate 233 through the leg hinge adjustment shaft 222. When the solenoid valve supplies air to the rodless chamber of the leg adjustment cylinder 221 through the air passage, the piston rod extends, pushing the leg support plate 233 to flip upward around the leg hinge adjustment shaft 222. Similarly, the cylinder body of the upper torso adjustment cylinder 224 is hinged to the front crossbeam of the base 21, and the piston rod end drives the torso support plate 232 through the upper torso hinge adjustment shaft 225. When the upper torso adjustment cylinder 224 is inflated, the torso support plate 232 rises, changing the human body from a supine position to a leaning position with the upper body raised.

[0029] The control component 1 includes a negative pressure regulating box 11, which has at least one inflation port 113 for connecting to the tubing of the airbag 234.

[0030] A negative pressure regulating box 11 is installed inside the housing of control component 1. The negative pressure regulating box 11 is a sealed aluminum alloy enclosure, integrating a miniature air pump and a negative pressure sensor. An inflation port 113 is located on the panel of the negative pressure regulating box 11 and is a self-sealing quick-connect fitting with a self-locking valve core. The end of the air pipe of the airbag 234 is connected to a mating connector. When the mating connector is inserted into the inflation port 113, the valve core inside the quick-connect fitting is opened, and the gas passage is opened. The compressed gas generated by the air pump is pressure-stabilized by a buffer tank and then controlled by a distribution valve group, injected into the corresponding airbag 234 through the air pipe from the inflation port 113. When deflation is required, the distribution valve group switches to the exhaust circuit, and the gas inside the airbag 234 is discharged to the outside through the inflation port 113 and the silencer of the negative pressure regulating box 11.

[0031] The negative pressure regulating box 11 is also equipped with an air inlet / outlet 111 and a pipe head placement rack 112.

[0032] An air inlet / outlet 111 is provided on the upper part of the panel of the negative pressure regulating box 11. An axial flow fan is installed inside the air inlet / outlet 111. The fan rotation creates forced convection, expelling the heat generated by the air pump inside the box through the air inlet / outlet 111. The room temperature airflow after heat exchange is drawn into the box to circulate and dissipate heat from the circuit board. The tube head placement rack 112 is installed below the inflation connection port 113. The tube head placement rack 112 consists of multiple C-shaped elastic clips, the inner diameter of which is slightly smaller than the outer diameter of the air pipe connector. When the airbag 234 tubing is removed from the inflation connection port 113 and left idle, the tube connector can be inserted into the clips of the tube head placement rack 112 for storage and dust prevention.

[0033] The control component 1 is provided with an external component 12, which includes a data connector 121 and a cable connector 122.

[0034] The back panel of control component 1 is equipped with an external component 12, which includes a data connector 121 and a cable connector 122. The data connector 121 is a standard DB9 female connector, connected to the serial port of the main control board via a data bus. The main control board encodes the human characteristic data collected and processed by the piezoelectric sensor 235 and transmits it externally via the data connector 121 for reading by external monitoring equipment or a host computer. The cable connector 122 is a three-core aviation waterproof socket, connected to the AC power supply. AC power is connected to the switching power supply module via the cable connector 122, converting AC power to DC power before supplying it to control component 1.

[0035] The control component 1 is also equipped with a display panel 14 for displaying working status and vital sign data, as well as multiple control buttons 15.

[0036] A display panel 14 is mounted on the inclined surface of the housing of control component 1. The display panel 14 is an LCD touch screen, and its back cable is connected to the main board driver circuit to receive graphic signals from the main board and display the current air pressure value of each airbag 234, the human body pressure distribution map fed back by the piezoelectric sensor 235, and the working mode of control component 1. Multiple physical control buttons 15 are arranged on both sides of the display panel 14. The control buttons 15 are membrane buttons with LED backlighting. When the corresponding control button 15 is pressed, the mechanical contact closes, sending a switching signal to the control board. The control board then performs operations such as forced inflation, deflation, reset, or switching between automatic and manual modes. The base 21 of the bed assembly 2 integrates an inflation connector 214 and a power connector 215. The control assembly 1 connects to the inflation connector 214 and the power connector 215 via a quick-connect fitting to achieve the connection between the air circuit and the electrical circuit.

[0037] The base 21 of the bed frame assembly 2 integrates and fixes an inflation connector 214 and a power connector 215 on its side. The inflation connector 214 is a multi-hole integrated air channel socket with multiple independent air channels arranged inside, each air channel being connected to a set of airbags 234 through internal tubing. The power connector 215 is a multi-pin rectangular electrical connector socket, with its pins connecting to the adjustment cylinder solenoid valve cable on the base 21 and the piezoelectric sensor 235 cable in the leg area, respectively. An integrated cable with multiple air channel plugs and electrical plugs extends from the back plate of the control assembly 1, with a quick-connect connector at the end of the integrated cable that matches the integrated socket on the base. During connection, the quick-connect connector is aligned with the inflation connector 214 and the power connector 215 and inserted; the locking ring automatically screws in and locks, achieving simultaneous connection of the air and electrical circuits.

[0038] There are multiple piezoelectric sensors 235, which are respectively arranged in the areas of the support assembly 23 corresponding to the waist, back and legs of the human body; the support assembly 23 also includes a waist fixing block 231 located in the middle.

[0039] Three piezoelectric sensors 235 are sewn into the padding layer of the support assembly 23, corresponding to the waist, back, and legs of the human body, respectively. Each piezoelectric sensor 235 is made of polyvinylidene fluoride piezoelectric film, with silver electrodes deposited on its upper and lower surfaces. When the human body lies down, static and dynamic pressure is applied to the bed surface in each area. The deformation of the piezoelectric film under pressure causes changes in the amount of charge on the electrodes. The charge signal is converted into a voltage signal output by a charge amplifier. A waist fixation block 231 is fixed in the middle of the support assembly 23. The waist fixation block 231 is a U-shaped high-resilience sponge block, horizontally embedded between the airbags 234 matrix, used to provide physiological curvature support for the waist area and prevent the waist from sinking too much or hanging in the air. Working principle: During operation, the mains power is first connected to the switching power supply module inside the control component 1 via the cable connector 122 and converted into DC power supply. If the control component 1 and the bed body component 2 are separate, the control component 1 can be pushed to the side of the bed using its bottom drive caster 13. The quick connector at the end of the integrated cable extending from the back plate of the control component 1 is simultaneously inserted into the air connector 214 and the power connector 215 integrated on the side of the base 21 and locked, so that the air circuit and the circuit are connected at one time. If it is necessary to move the two as a whole, the hook on the side wall of the control component 1 is slid into the slot of the connector 213 on the side of the bottom frame 211 to complete the mechanical connection. It is pushed synchronously with the travel caster 212 at the bottom of the bed body component 2 and braked to fix it. After the user lies down, the torso, waist, and legs press against the corresponding piezoelectric sensors 235 within the support assembly 23. The three piezoelectric sensors 235, made of polyvinylidene fluoride piezoelectric film, deform under pressure, causing changes in electrode charge. The charge signal is converted into a voltage signal by a charge amplifier and sent along the signal line to the main control board of the control assembly 1. The main control board filters the voltage signal and calculates the pressure distribution, obtaining the pressure value for each area and automatically generating adjustment commands. During adjustment, the control assembly 1 activates the miniature air pump in the negative pressure regulating box 11. The compressed gas generated by the air pump is buffered and stabilized before entering the distribution valve group. The main control board controls the corresponding solenoid valve to open, and gas flows from the inflation connection port 113 through the self-sealing quick-connect fitting into the corresponding airbag 234. Simultaneously, the distribution valve group switches the airbag 234 requiring decompression to the exhaust circuit, and the gas is discharged through the silencer. By changing the inflation degree of the airbag 234, the support firmness of each area is adjusted in real time. At this time, the axial fan inside the air inlet / outlet 111 continuously rotates, forcibly convection to dissipate heat from the air pump and circuit board. If the sleeping posture needs to be adjusted, the main control board sends an electrical signal to the adjustment component 22 via the power connector 215, controlling the rodless chamber of the leg adjustment cylinder 221 to allow air to enter, causing its piston rod to extend. The piston rod pushes the leg support plate 233 upward and turns via the leg hinge adjustment shaft 222. At the same time, the upper torso adjustment cylinder 224 is also controlled to enter air, pushing the torso support plate 232 upward via the upper torso hinge adjustment shaft 225, so that the body turns into a reclining posture. The lumbar fixation block 231 maintains the physiological curvature of the lumbar region throughout the process. The current air pressure of all airbags 234 and the vital signs data collected by the piezoelectric sensor 235 are displayed in real time on the display panel 14 on the inclined surface of the control component 1. The operator can also manually force inflation, deflation, or reset via the control buttons 15 on both sides of the display panel 14. When the tubing is disconnected from the inflation connector 113, the connector can be locked into the C-shaped elastic buckle of the lower tube head placement bracket 112 for dust protection. If vital signs data need to be transmitted to external monitoring equipment, the main control board encodes the processed data and outputs it through the standard DB9 interface of the data connector 121.

[0040] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A piezoelectric sensing-based adjustable firmness sleeping bed, characterized in that, include: The bed assembly (2) includes a base (21) and a support assembly (23) disposed above the base (21); the support assembly (23) is provided with multiple airbags (234), and the support assembly (23) is integrated with a piezoelectric sensor (235) for collecting human vital signs data. The control component (1), which is separate from or integrated with the bed assembly (2), is used to receive the signal from the piezoelectric sensor (235) and control the inflation amount of each airbag (234) according to the signal to adjust the firmness of the bed.

2. The piezoelectric sensing-based adjustable sleep bed according to claim 1, characterized in that, The base (21) includes a bottom frame (211) and a universal wheel (212) disposed at the bottom of the bottom frame (211).

3. The piezoelectric sensing-based adjustable sleep bed according to claim 2, characterized in that, The base (21) is provided with a connector (213), and the bottom of the control component (1) is provided with a drive universal wheel (13); the control component (1) is detachably connected to the bed component (2) through the connector (213).

4. The piezoelectric sensing-based adjustable sleep bed according to claim 1, characterized in that, An adjustment assembly (22) is provided between the support assembly (23) and the base (21); the adjustment assembly (22) includes a leg adjustment cylinder (221) and a leg hinge adjustment shaft (222) for driving the leg support plate (233) to bend, and an upper torso adjustment cylinder (224) and an upper torso hinge adjustment shaft (225) for driving the torso support plate (232) to bend.

5. The piezoelectric sensing-based adjustable sleep bed according to claim 1, characterized in that, The control component (1) includes a negative pressure regulating box (11), which is provided with at least one inflation port (113) for connecting to the airbag (234) pipeline.

6. The piezoelectric sensing-based adjustable sleep bed according to claim 5, characterized in that, The negative pressure regulating box (11) is also equipped with an air inlet / outlet (111) and a pipe head placement rack (112).

7. The piezoelectric sensing-based adjustable sleep bed according to claim 1, characterized in that, The control component (1) is provided with an external component (12), which includes a data connector (121) and a cable connector (122).

8. The piezoelectric sensing-based adjustable sleep bed according to claim 1, characterized in that, The control component (1) is also provided with a display panel (14) for displaying working status and vital sign data, as well as multiple control buttons (15).

9. The piezoelectric sensing-based adjustable sleep bed according to claim 1, characterized in that, The base (21) of the bed assembly (2) is equipped with an inflation connector (214) and a power connector (215). The control assembly (1) is connected to the inflation connector (214) and the power connector (215) through a quick-connect fitting to realize the connection between the air circuit and the electrical circuit.

10. The piezoelectric sensing-based adjustable sleep bed according to claim 1, characterized in that, The piezoelectric sensors (235) are multiple and are respectively arranged in the areas of the support assembly (23) corresponding to the waist, back and legs of the human body; the support assembly (23) also includes a waist fixing block (231) located in the middle.

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