Design method of multifunctional intelligent bed

Abstract

The invention relates to a design method of a multifunctional intelligent bed. The design method comprises the following steps: step 1, determining the size of the intelligent bed; 2, designing the structure of the intelligent bed; step 3, selecting a driving element; 4, performing three-dimensional modeling on the intelligent bed; 5, checking the whole intelligent bed; the size of the device is determined according to the size of a human body template and the ergonomics theory, the back lifting structure, the leg lifting structure and the back S-shaped structure are modularly designed in sequence, the functional requirement is met, the structure is simple, a good foundation is provided for improving the design efficiency, and the design cost is reduced according to the design requirement. Mathematical calculation is carried out by taking power and thrust as selection principles, accurate data support is provided for selection of driving elements, mechanical properties of the intelligent bed are analyzed and checked, structural improvement and model optimization are carried out on places which do not meet mechanical test requirements, so that a final model is determined, and the whole method is systematic, scientific and high in design efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent bed design, and in particular to a design method of a multifunctional intelligent bed. Background Art

[0002] In today's fast-paced era, it is not easy to have a good sleep. People spend about one-third of their lives sleeping, and the quality of sleep will also affect the quality of life. In such an environment, the sleep industry is also known as the "holy land of entrepreneurship." Some companies have added high-tech elements to the design of smart beds. The electric multifunctional beds and medical smart electric beds they produce have provided great convenience for people's lives. After installing electric devices and electric motors in the bedroom, they can be controlled by tablet computers and mobile phones, which can not only ensure high-quality healthy sleep, but also bring people comfortable enjoyment.

[0003] As people pay more and more attention to sleep quality, the smart beds that appear in the sleep market can solve sleep problems and prevent human sub-health to a certain extent, which naturally attracts widespread attention from consumers. But now, with the gradual differentiation of consumers' sleep habits and requirements, traditional electric beds with a single function can no longer meet people's life needs. In the process of daily work and study, people with high concentration often suffer from lumbar muscle strain and neck pain when standing or sitting in a fixed position for a long time, and serious cases may lead to chronic diseases such as lumbar disc herniation and cervical disc herniation. The back plate of a conventional electric bed is straight and cannot support the cervical and lumbar vertebrae, which makes the waist and cervical vertebrae suspended for a long time, and the ligaments and muscles exert force for a long time, resulting in fatigue and poor experience. Therefore, it is necessary to carry out the design of smart beds to meet multi-functional needs. At present, when designing smart beds, there are often problems such as cumbersome design methods, diverse driving components and difficult selection, and low design efficiency.

[0004] Therefore, the present invention proposes a design method of a multifunctional intelligent bed to solve the above problems. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a design method for a multifunctional intelligent bed, which solves the problems of complicated design method, diverse and difficult selection of driving elements, and low design efficiency.

[0006] In order to solve the above technical problems, the technical solution of the present invention is: a design method of a multifunctional intelligent bed, the innovation of which is: comprising the following steps:

[0007] Step 1: Determine the size of the smart bed: Determine the size of the human body template according to the consumer group of the smart bed, and determine the size of the smart bed frame based on ergonomic theory and the size of the human body template;

[0008] Step 2: Smart bed structure design: According to the functional requirements of the smart bed, the structures of the back lifting module, the back S-shaped module, and the leg lifting module are designed respectively;

[0009] Step 3, selection of driving components: based on power and thrust as the selection principle, select the driving components of the back lifting module, the back S-shaped module, and the leg lifting module respectively;

[0010] Step 4: 3D modeling of the smart bed: Design and model each module of the smart bed using 3D modeling software, and assemble each module according to the working principle of the smart bed to obtain a 3D model;

[0011] Step 5: Overall verification of the smart bed: Import the 3D model into ANSYS Workbench software for finite element processing and analysis to determine whether the structural strength of the smart bed meets the requirements.

[0012] Furthermore, the detailed steps of determining the size of the smart bed in step 1 include:

[0013] Step 1-1, according to the consumer group of the smart bed, the human body is divided from head to foot into four areas: shoulder and back, waist, buttocks, and legs. The top of the human head is taken as the starting point to clarify the size range of the four areas of the human body and obtain the template size of the human body;

[0014] Step 1-2: Determine the size of the smart bed frame. Divide the frame into four areas: back board, buttocks board, thigh board and calf board. Based on ergonomic theory and the size of the human body template, determine the size of the four areas of the smart bed frame.

[0015] Step 1-3: According to the requirements of the smart bed, clarify the angle adjustment indicators of each bed board of the smart bed.

[0016] Furthermore, the structures of the back lifting module, the back S-shaped module, and the leg lifting module designed in step 2 are:

[0017] The back lifting module comprises a back plate, a back support rod, a spiral rod and a screw cap, a buttocks plate is installed in the middle of the top surface of the bed frame, the back plate is arranged at one side of the buttocks plate and is hingedly connected to the buttocks plate, the spiral rod is arranged below the back plate, the two ends of the spiral rod are respectively rotatably mounted on the bed frame through a first bearing, the screw cap is movably threadedly sleeved on the spiral rod, the back support rod is arranged between the spiral rod and the back plate, the two ends of the back support rod are respectively hingedly connected to the back plate and the screw cap, the spiral rod is driven to rotate by a back motor, the screw cap moves along the axial direction of the spiral rod as the spiral rod rotates, and drives the back plate to rotate through the back support rod, the back motor is installed on the bed frame, and is connected to the bolt rod through a first coupling;

[0018] The back S-shaped module includes a push back rod, a push neck rod and a push rod connecting block, a first accommodating groove for the push rod connecting block to enter is opened on the top surface of the back plate, the push rod connecting block is movably arranged in the first accommodating groove, and is driven by a push rod motor to move in a direction perpendicular to the back plate to extend out of or enter the first accommodating groove, the push back rod and the push neck rod are respectively installed on both sides of the top surface of the push rod connecting block, the push back rod is located on the side of the push neck rod close to the hip plate, a second accommodating groove for the push back rod and the push neck rod to enter with the push rod connecting block is opened on the top surface of the back plate, the push back rod and the push neck rod are movably arranged in the second accommodating groove, and are synchronously moved into or out of the second accommodating groove with the movement of the push rod connecting block;

[0019] The leg lifting module includes a thigh board, a calf board and a connecting rod assembly, the connecting rod assembly includes a first leg connecting rod, a second leg connecting rod and a third leg connecting rod which are arranged in sequence, two ends of the second leg connecting rod are hinged to the first leg connecting rod and the third leg connecting rod respectively, the first leg connecting rod is located on a side of the second leg connecting rod close to the hip board, one end of the first leg connecting rod away from the second leg connecting rod is rotatably mounted on the bed frame through a connecting rod rotating shaft and driven to rotate by a leg motor, the leg motor is fixedly mounted on the bed frame, one end of the connecting rod rotating shaft is rotatably mounted on the bed frame through a second bearing, the other end of the connecting rod rotating shaft is connected to the rotating output end of the leg motor through a second coupling, the first leg connecting rod is fixedly connected to the connecting rod rotating shaft, one end of the third leg connecting rod away from the second leg connecting rod is hinged to the bed frame, the thigh board is mounted on the top surface of the first leg connecting rod, and the calf board is mounted on the top surface of the second leg connecting rod.

[0020] Furthermore, the method for selecting the back motor is:

[0021] (1) Calculate the arm transfer power P required for the back plate to rotate. The calculation formula is:

[0022] P=Tv

[0023] Among them, T is the upper limit of the load requirement of the back board of the smart bed;

[0024] v is the arm speed of the back plate, and the calculation formula is:

[0025] v=ωl

[0026] Where, l is the arm radius of the back plate;

[0027] ω is the angular velocity of the back plate, and the calculation formula is:

[0028]

[0029] Where θ is the upper limit of the back panel angle adjustment, and t is the time required for the back panel to rotate to the maximum angle;

[0030] (2) Calculate the actual power P2 required by the back motor using the following formula:

[0031] P2=1.2×[p 许 ]

[0032] Among them, [p 许 ] is the allowable power of the back motor, and the calculation formula is:

[0033]

[0034] Among them, η 轴承 , η 联轴器 , η 螺杆 are the transmission efficiencies of the first bearing, the first coupling and the screw rod respectively;

[0035] (3) Calculate the required speed n of the back motor using the following formula:

[0036]

[0037] Wherein, L is the stroke when the back plate rotates to the upper limit of the angle adjustment, and d is the pitch of the screw rod threads;

[0038] (4) Select the model of the back motor according to the actual required power P2 and required speed n of the back motor.

[0039] Furthermore, the method for selecting the leg motor is:

[0040] First, calculate the arm transfer power P' required for the thigh plate rotation. The calculation method is the same as the arm transfer power P required for the back plate rotation. Then calculate the allowable power of the leg motor [p 许 '], the calculation formula is Among them, η' 轴承 , η' 联轴器 are the transmission efficiencies of the second bearing and the second coupling respectively, and then according to the allowable power [p 许 '] Calculate the actual required power P2' of the leg motor. The calculation method is the same as the actual required power P2 of the back motor. Finally, select the model of the leg motor based on the actual required power P2' of the leg motor.

[0041] Furthermore, the method for selecting the push rod motor is as follows:

[0042] Select the model of the push rod motor according to the upper limit of the load requirement and the maximum stroke requirement of the S-shaped module on the back.

[0043] Furthermore, the detailed steps of the overall verification of the smart bed in step 5 include:

[0044] Step 5-1, import the 3D model into ANSYS Workbench software, perform meshing, input material parameters, add fixed support constraints and vertical static loads;

[0045] Step 5-2: Solve the stress and deformation results of the three-dimensional model to obtain the static pressure equivalent stress cloud map of the intelligent bed, compare the maximum structural stress in the static pressure equivalent stress cloud map with the yield limit of the material to determine whether the strength meets the requirements.

[0046] The advantages of the present invention are:

[0047] The invention determines the size of the human body template according to the consumer group, determines the size of the device under the guidance of ergonomics theory, and modularizes the back lifting structure, the leg lifting structure, and the back S-shaped structure in turn. Each mechanism module not only meets the functional requirements but also has a simple structure, which provides a good foundation for improving design efficiency. According to design needs, mathematical calculations are carried out with power and thrust as selection principles to provide accurate data support for the selection of drive elements, so as to select reasonable drive elements. The designed scheme is used to design and solid model the main modules of the smart bed through three-dimensional modeling software, and the components are virtually assembled according to the working principle of the smart bed. The mechanical properties of the smart bed are analyzed and checked in ANSYS Workbench, and the structure of the places that do not meet the mechanical test requirements is improved and the model is optimized to determine the final model. The whole method is systematic and scientific, and the design efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0049] Figure 1 The present invention is a flowchart of the design method of the multifunctional intelligent bed.

[0050] Figure 2 It is a structural schematic diagram of the multifunctional intelligent bed of the present invention.

[0051] Figure 3 This is a front view of the multifunctional smart bed of the present invention.

[0052] Figure 4 This is a top view of the multifunctional smart bed of the present invention.

[0053] Figure 5 This is a schematic diagram of the grid division of the smart bed of the present invention.

[0054] Figure 6 It is the static pressure equivalent stress cloud diagram of the present invention.

[0055] Figure 7 It is a general deformation diagram of the present invention. DETAILED DESCRIPTION

[0056] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0057] Example

[0058] This embodiment provides a design method for a multifunctional intelligent bed. Figure 1 As shown, the following steps are included:

[0059] Step 1: Determine the size of the smart bed: According to the consumer group of the smart bed, determine the size of the human body template, and combine the ergonomic theory with the human body template size to determine the size of the smart bed frame. The detailed steps include:

[0060] Step 1-1, according to the consumer group of smart beds, in accordance with the specifications of the home furnishing industry group standard T-SZFA2003.1-2019 "Mattress Ergonomics Evaluation-Mattress Hardness Grading and Distribution Test Evaluation Method" and the home furnishing industry group standard T / SZFA.2003.2-2019 "Mattress Ergonomics Evaluation-Mattress Fit Grading and Distribution Test Evaluation Method", the human body is divided from head to foot into four areas: shoulder and back, waist, buttocks, and legs. The top of the human head is taken as the starting point to clarify the size range of the four areas of the human body and obtain the template size of the human body, where the range of the shoulder and back is 0mm-640mm, the range of the waist area is 640mm-760mm, the range of the buttocks area is 760mm-1240mm, and the range of the leg area is less than 1240mm;

[0061] Step 1-2, clarify the size of the smart bed frame. The overall size of the smart bed frame is set to 2000mm in length, 1800mm in width, and 600mm in height. The frame of the smart bed is divided into four areas: back board, buttocks board, thigh board, and calf board. The size of the four areas of the smart bed frame is clarified based on ergonomic theory and the template size of the human body. In this embodiment, along the length direction of the frame, the size of the back board is 760mm, the size of the buttocks board is 240mm, the size of the thigh board is 485mm, and the size of the calf board is 515mm. Among them, the back board can be further divided, the size of the head part is 280mm, and the size of the waist and back part is 480mm;

[0062] Step 1-3, according to the requirements of the smart bed, clarify the angle adjustment indicators of each bed board of the smart bed. In this embodiment, the adjustment angle of the back board is 0-75°, the adjustment angle of the thigh board is 0-35°, and the required support height of the waist is 0-50mm.

[0063] Step 2: Smart bed structure design: According to the functional requirements of the smart bed, the structures of the back lifting module, the back S-shaped module, and the leg lifting module are designed respectively;

[0064] In this embodiment, Figure 2-4 As shown, the back lifting module 2 includes a back plate 201, a back support rod 202, a screw rod 203 and a screw cap 204. A buttocks plate 1 is installed in the middle of the top surface of the bed frame. The back plate 201 is arranged on one side of the buttocks plate 1 and is hingedly connected to the buttocks plate 1. The screw rod 203 is arranged below the back plate 201. The two ends of the screw rod 203 are respectively rotatably installed on the bed frame through a first bearing 205. The screw cap 204 is movably threaded on the screw rod 203. The back support rod 202 is arranged between the screw rod 203 and the back plate 201. The two ends of the back support rod 202 are respectively hingedly connected to the back plate 201 and the screw cap 204. The screw rod 203 is driven to rotate by the back motor 206. The screw cap 204 moves along the axial direction of the screw rod 203 as the screw rod 203 rotates, and drives the back plate 201 to rotate through the back support rod 202. The back motor 206 is installed on the bed frame and is connected to the bolt rod 203 through a first coupling.

[0065] The back S-shaped module 3 includes a push back rod 302, a push neck rod 301 and a push rod connecting block 303. A first accommodating groove for the push rod connecting block 303 to enter is opened on the top surface of the back plate 201. The push rod connecting block 303 is movably arranged in the first accommodating groove and is driven by the push rod motor 204 to move in a direction perpendicular to the back plate 201 to extend out of or enter the first accommodating groove. The push back rod 302 and the push neck rod 301 are respectively installed on both sides of the top surface of the push rod connecting block 303. The push back rod 302 is located on the side of the push neck rod 301 close to the hip plate 1. A second accommodating groove for the push back rod 302 and the push neck rod 301 to enter along with the push rod connecting block 303 is opened on the top surface of the back plate 201. The push back rod 302 and the push neck rod 301 are movably arranged in the second accommodating groove and move synchronously into or out of the second accommodating groove as the push rod connecting block 303 moves.

[0066] The leg lifting module 4 includes a thigh board 401, a calf board 402 and a connecting rod assembly, wherein the connecting rod assembly includes a first leg connecting rod 403, a second leg connecting rod 404 and a third leg connecting rod 405 arranged in sequence, and the two ends of the second leg connecting rod 404 are respectively hinged to the first leg connecting rod 403 and the third leg connecting rod 405, the first leg connecting rod 403 is located on the side of the second leg connecting rod 404 close to the hip board 1, and the end of the first leg connecting rod 403 away from the second leg connecting rod 404 is rotatably mounted on the bed frame through a connecting rod rotating shaft 408 and is connected to the bed frame through the leg The motor 406 drives the rotation, the leg motor 406 is fixedly installed on the bed frame, one end of the connecting rod shaft 408 is rotatably installed on the bed frame through a second bearing, the other end of the connecting rod shaft 408 is connected to the rotation output end of the leg motor through a second coupling 407, the first leg connecting rod 403 is fixedly connected to the connecting rod shaft 408, the end of the third leg connecting rod 405 away from the second leg connecting rod 404 is hinged to the bed frame, the thigh board 401 is installed on the top surface of the first leg connecting rod 403, and the calf board 402 is installed on the top surface of the second leg connecting rod 404.

[0067] Step 3, selection of driving components: based on power and thrust as the selection principle, select the driving components of the back lifting module, the back S-shaped module, and the leg lifting module respectively;

[0068] Selection method of the back motor, the driving element of the back lifting module:

[0069] (1) Calculate the arm transfer power P required for the back plate to rotate. The calculation formula is:

[0070] Formula 1: P = Tv

[0071] Among them, T is the upper limit of the load requirement of the back board of the smart bed;

[0072] v is the arm speed of the back plate, and the calculation formula is:

[0073] Formula 2: v = ωl

[0074] Where, l is the arm radius of the back plate;

[0075] ω is the angular velocity of the back plate, and the calculation formula is:

[0076] Formula 3:

[0077] Where θ is the upper limit of the back panel angle adjustment, and t is the time required for the back panel to rotate to the maximum angle;

[0078] In this embodiment, the time required for the back panel to rotate to the maximum angle is 30 seconds, and the upper limit of the back panel angle adjustment is 75 degrees. Substituting t = 30 seconds and θ = 75 degrees into Formula 3, ω = 0.044 rad / s is calculated;

[0079] In this embodiment, the radius l of the rotating arm of the back plate is 0.28m. Substituting l=0.28m and ω=0.044rad / s into Formula 2, v=0.01232m / s is calculated.

[0080] In this embodiment, the upper limit of the load requirement of the back plate of the smart bed is 1000N. Substituting T=1000N and v=0.01232m / s into Formula 1, P=12.32W is calculated.

[0081] (2) Calculate the actual power P2 required by the back motor using the following formula:

[0082] Formula 4: P2 = 1.2 × [p 许 ]

[0083] Among them, [p 许 ] is the allowable power of the back motor, and the calculation formula is:

[0084] Formula 5:

[0085] Among them, η 轴承 , η 联轴器 , η 螺杆 are the transmission efficiencies of the first bearing, the first coupling and the screw rod respectively;

[0086] In this embodiment, the transmission efficiencies of the first bearing, the first coupling and the screw rod are 0.99, 0.98 and 0.4 respectively. 轴承 =0.99, η 联轴器 =0.98, η 螺杆 =0.4 Substitute into formula 5 and we get [p 许 ]=32W, 许 ]=32W and substitute it into formula 4 to obtain: P2=38W.

[0087] (3) Calculate the required speed n of the back motor using the following formula:

[0088] Formula 6:

[0089] Wherein, L is the stroke when the back plate rotates to the upper limit of the angle adjustment, and d is the pitch of the screw rod threads;

[0090] In this embodiment, L=300 mm, d=2 mm, and substituting into Formula 6, n=300 r / min is calculated.

[0091] (3) According to the actual required power P2 and required speed n of the back motor, the rated power of the back motor needs to be greater than 38W and the speed needs to be greater than 300r / min, so as to select the optimal back motor model within this range.

[0092] The selection method of leg motor is:

[0093] First, calculate the arm transfer power P' required for the thigh plate rotation. The calculation method is the same as the arm transfer power P required for the back plate rotation. Then calculate the allowable power of the leg motor [p 许 '], the calculation formula is:

[0094] Formula 7:

[0095] Among them, η' 轴承 , η' 联轴器 are the transmission efficiencies of the second bearing and the second coupling respectively, and then according to the allowable power [p 许 '] Calculate the actual required power P2' of the leg motor. The calculation method is the same as the actual required power P2 of the back motor. Finally, select the model of the leg motor based on the actual required power P2' of the leg motor.

[0096] In this embodiment, the time t'=35s required for the thigh board to rotate to the maximum angle, the upper limit of the thigh board angle adjustment is θ'=35°, and the angular velocity of the thigh board arm can be obtained by substituting into formula 3: ω'=0.0174rad / s;

[0097] The arm radius of the thigh plate is l'=400mm, ω'=0.0174rad / s, and the arm speed of the thigh plate can be obtained by substituting into formula 2: v'=0.00696m / s;

[0098] The upper limit of the thigh board load requirement is T' = 500N, v' = 0.00696m / s. Substituting into formula 1, the power transmitted by the thigh board's arm can be obtained as P' = 3.48W;

[0099] The transmission efficiencies of the second bearing and the second coupling are 0.99 and 0.98 respectively. 联轴器 =0.98, η' 轴承 =0.99 Substituting into formula 7, we can get [p 许 ']=3.6W, 许 Substituting ']=3.6W into formula 4, we can get the actual required power P2'=4.3W for the leg motor. Select a leg motor with a rated power greater than 4.3W.

[0100] How to select a push rod motor:

[0101] The model of the push rod motor is selected according to the upper limit of the load requirement and the maximum stroke requirement of the S-shaped module on the back. In this embodiment, the upper limit of the load requirement of the S-shaped module on the back is 900N, and the maximum stroke is 50mm. Therefore, it is necessary to select an electric push rod with a rated thrust greater than 900N and a stroke range greater than 50mm.

[0102] Step 4: 3D modeling of the smart bed: Design and model each module of the smart bed using 3D modeling software, and assemble each module according to the working principle of the smart bed to obtain a 3D model;

[0103] Step 5: Overall verification of the smart bed: Import the 3D model into ANSYS Workbench software for finite element processing and analysis to determine whether the structural strength of the smart bed meets the requirements. The detailed steps include:

[0104] Step 5-1, import the 3D model into ANSYS Workbench software, perform meshing, input material parameters, add fixed support constraints and vertical static loads;

[0105] In this embodiment, the material used for the smart bed is Q235 steel. The parameter characteristics of Q235 material are shown in Table 1. The imported three-dimensional model is meshed, as shown in Figure 5 shown.

[0106] Table 1 Parameter characteristics of Q235 material

[0107] Material <![CDATA[Density ρ (kg / m 3 )]]> <![CDATA[Young's modulus E (N / m 2 )]]> Poisson's ratio μ <![CDATA[Yield strength σ s (N / m 2 )]]> Q235 7850 <![CDATA[2.06×10 11 ]]> 0.29 <![CDATA[2.35×10 8 ]]>

[0108] In order to make the smart bed have excellent mechanical properties, it is necessary to conduct mechanical simulation analysis on the mechanical properties of the smart bed according to the mechanical test standard GB / T 4191-2011 and the functional activity extension mechanical device QB / T 4191-2011. If the strength of the structure is found to be insufficient under the test conditions, it should be modified to meet the test requirements. The mechanical performance test requirements of the smart bed are shown in Table 2:

[0109] Table 2 Mechanical performance test requirements of smart beds

[0110]

[0111] When performing finite element analysis, the addition of static loads and fixed constraints is essential. Adding accurate static loads and fixed constraints can improve the model calculation efficiency and result accuracy. According to the free fall formula and the law of conservation of momentum, the expression is listed as:

[0112] Formula 8:

[0113] Formula 9: (Mg-F)·t=0-Mv

[0114] Where M is the mass of the load, in kg; g is the acceleration due to gravity, in m / s 2 ; h is the height of the load, unit is m; t is the time of the impact process of the object, unit is s; F is the instantaneous uniform force of the object under the load, unit is N; v is the instantaneous velocity of the load and the object under the load, unit is m / s.

[0115] According to the requirements in Table 2, a load of 90kg is placed 406mm vertically above the hip plate, and free fall is performed once; when testing the leg plate and back plate, a load of 34kg is placed 305mm vertically above, and falls vertically and performs one impact. Combining Formula 8 and Formula 9, it can be concluded that the average load of the hip plate is 3142.86N, the average load of the leg is 1200N, and the average load of the back plate is 2296.88N. The smart bed in this embodiment is a double bed, so the average load of the leg is 2400N.

[0116] Step 5-2: Solve the stress and deformation results of the three-dimensional model to obtain the static pressure equivalent stress cloud map of the smart bed ( Figure 6 ) and the total deformation diagram ( Figure 7 ), under the load of GB / T 4191-2011 mechanical test standard, according to the static pressure equivalent stress cloud diagram of the intelligent bed, the maximum stress of the structure is about 118.2MPa. The material used for the parts of the intelligent bed is Q235 carbon structural steel, the yield limit of the material is 235MPa, and the maximum deformation is about 0.18mm. The stress of the structure is less than the yield limit of the material, so there will be no plastic deformation of the structure, and the strength meets the requirements.

[0117] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A design method for a multifunctional intelligent bed, characterized in that: The following steps are involved: Step 1: Determine the size of the smart bed: Determine the size of the human body template according to the consumer group of the smart bed, and determine the size of the smart bed frame based on ergonomic theory and the human body template size; Step 2: Smart bed structure design: According to the functional requirements of the smart bed, the structures of the back lifting module, the back S-shaped module, and the leg lifting module are designed respectively; Step 3, selection of driving components: based on power and thrust as the selection principle, select the driving components of the back lifting module, the back S-shaped module, and the leg lifting module respectively; Step 4: 3D modeling of the smart bed: Design and model each module of the smart bed using 3D modeling software, and assemble each module according to the working principle of the smart bed to obtain a 3D model; Step 5: Overall verification of the smart bed: Import the 3D model into ANSYS Workbench software for finite element processing and analysis to determine whether the structural strength of the smart bed meets the requirements.

2. The design method of the multifunctional intelligent bed according to claim 1, characterized in that: The detailed steps of determining the size of the smart bed in step 1 include: Step 1-1, according to the consumer group of the smart bed, the human body is divided from head to foot into four areas: shoulder and back, waist, buttocks, and legs. The top of the human head is taken as the starting point to clarify the size range of the four areas of the human body and obtain the template size of the human body; Step 1-2: Determine the size of the smart bed frame. Divide the frame into four areas: back board, buttocks board, thigh board and calf board. Based on ergonomic theory and the size of the human body template, determine the size of the four areas of the smart bed frame. Step 1-3: According to the requirements of the smart bed, clarify the angle adjustment indicators of each bed board of the smart bed.

3. The design method of the multifunctional intelligent bed according to claim 2, characterized in that: The structures of the back lifting module, back S-shaped module, and leg lifting module designed in step 2 are as follows: The back lifting module includes a back plate, a back support rod, a spiral rod and a screw cap. A buttocks plate is installed in the middle of the top surface of the bed frame. The back plate is arranged on one side of the buttocks plate and is hingedly connected to the buttocks plate. The spiral rod is arranged below the back plate. Both ends of the spiral rod are rotatably mounted on the bed frame through a first bearing. The screw cap is movably sleeved on the spiral rod. The back support rod is arranged between the spiral rod and the back plate. Both ends of the back support rod are hingedly connected to the back plate and the screw cap respectively. The spiral rod is driven to rotate by a back motor. The screw cap moves along the axial direction of the spiral rod as the spiral rod rotates, and drives the back plate to rotate through the back support rod. The back motor is installed on the bed frame and is connected to the bolt rod through a first coupling. The back S-shaped module includes a push back rod, a push neck rod and a push rod connecting block, a first accommodating groove for the push rod connecting block to enter is opened on the top surface of the back plate, the push rod connecting block is movably arranged in the first accommodating groove, and is driven by a push rod motor to move in a direction perpendicular to the back plate to extend out of or enter the first accommodating groove, the push back rod and the push neck rod are respectively installed on both sides of the top surface of the push rod connecting block, the push back rod is located on the side of the push neck rod close to the hip plate, a second accommodating groove for the push back rod and the push neck rod to enter with the push rod connecting block is opened on the top surface of the back plate, the push back rod and the push neck rod are movably arranged in the second accommodating groove, and are synchronously moved into or out of the second accommodating groove with the movement of the push rod connecting block; The leg lifting module includes a thigh board, a calf board and a connecting rod assembly, the connecting rod assembly includes a first leg connecting rod, a second leg connecting rod and a third leg connecting rod which are arranged in sequence, two ends of the second leg connecting rod are hinged to the first leg connecting rod and the third leg connecting rod respectively, the first leg connecting rod is located on a side of the second leg connecting rod close to the hip board, one end of the first leg connecting rod away from the second leg connecting rod is rotatably mounted on the bed frame through a connecting rod rotating shaft and driven to rotate by a leg motor, the leg motor is fixedly mounted on the bed frame, one end of the connecting rod rotating shaft is rotatably mounted on the bed frame through a second bearing, the other end of the connecting rod rotating shaft is connected to the rotating output end of the leg motor through a second coupling, the first leg connecting rod is fixedly connected to the connecting rod rotating shaft, one end of the third leg connecting rod away from the second leg connecting rod is hinged to the bed frame, the thigh board is mounted on the top surface of the first leg connecting rod, and the calf board is mounted on the top surface of the second leg connecting rod.

4. The design method of the multifunctional intelligent bed according to claim 3, characterized in that: The method for selecting the back motor is as follows: (1) Calculate the arm transfer power P required for the back plate to rotate. The calculation formula is: P=Tv Among them, T is the upper limit of the load requirement of the back board of the smart bed; v is the arm speed of the back plate, and the calculation formula is: v=ωl Where, l is the arm radius of the back plate; ω is the angular velocity of the back plate, and the calculation formula is: Where θ is the upper limit of the back panel angle adjustment, and t is the time required for the back panel to rotate to the maximum angle; (2) Calculate the actual power P2 required by the back motor using the following formula: P2=1.2×[p 许 ] Among them, [p 许 ] is the allowable power of the back motor, and the calculation formula is: Among them, η 轴承 , η 联轴器 , η 螺杆 are the transmission efficiencies of the first bearing, the first coupling and the screw rod respectively; (3) Calculate the required speed n of the back motor using the following formula: Wherein, L is the stroke when the back plate rotates to the upper limit of the angle adjustment, and d is the pitch of the screw rod threads; (4) Select the model of the back motor according to the actual required power P2 and required speed n of the back motor.

5. The design method of the multifunctional intelligent bed according to claim 4, characterized in that: The selection method of the leg motor is: First, calculate the arm transfer power P' required for the thigh plate rotation. The calculation method is the same as the arm transfer power P required for the back plate rotation. Then calculate the allowable power of the leg motor [p 许 '], the calculation formula is Among them, η' 轴承 , η' 联轴器 are the transmission efficiencies of the second bearing and the second coupling respectively, and then according to the allowable power [p 许 '] Calculate the actual required power P2' of the leg motor. The calculation method is the same as the actual required power P2 of the back motor. Finally, select the model of the leg motor based on the actual required power P2' of the leg motor.

6. The design method of the multifunctional intelligent bed according to claim 5, characterized in that: The selection method of the push rod motor: Select the model of the push rod motor according to the upper limit of the load requirement and the maximum stroke requirement of the S-shaped module on the back.

7. The design method of the multifunctional intelligent bed according to claim 6, characterized in that: The detailed steps of the overall verification of the intelligent bed in step 5 include: Step 5-1, import the 3D model into ANSYS Workbench software, perform meshing, input material parameters, add fixed support constraints and vertical static loads; Step 5-2: Solve the stress and deformation results of the three-dimensional model to obtain the static pressure equivalent stress cloud map of the intelligent bed, compare the maximum structural stress in the static pressure equivalent stress cloud map with the yield limit of the material to determine whether the strength meets the requirements.

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