Driving structure and electric bed

Abstract

The utility model provides a kind of driving structure and electric bed, driving structure includes pulley and backing plate, pulley includes bearing wheel and the limiting wheel smaller in diameter than bearing wheel, limiting wheel is rotatably connected in one side of bearing wheel;Backing plate includes the force edge and limiting edge of interval opposite arrangement;Wherein, bearing wheel is slidably connected with force edge, limiting wheel is located between force edge and limiting edge and is slidably connected with limiting edge, and limiting edge and limiting wheel interference fit and exert force towards force edge to limiting wheel.This application is rotatably connected with limiting wheel in one side of bearing wheel, and the pressure towards force edge is exerted to limiting wheel by limiting edge, to make limiting wheel conduct pressure to bearing wheel, and then make bearing wheel receive the pressure towards force edge, to eliminate the gap of bearing wheel and force edge, to avoid the problem that bearing wheel and backing plate impact abnormal sound occurs, and without using velvet or soft glue, improve the service life of driving structure.

Description

Technical Field

[0001] This utility model relates to the field of mechanical drives, and in particular to a drive structure and an electric bed. Background Technology

[0002] With the development of smart homes, more and more home appliances are becoming increasingly intelligent, and controlling their posture is one of the functions of smart homes, thus bringing users a more comfortable experience. As an intelligent home and medical care device that enhances user comfort, the structural stability and quiet operation of electric beds are crucial. Currently, most mainstream electric beds use a pulley-guide rail drive system for their leg lifting mechanisms. Due to welding and assembly errors, gaps exist between the pulleys and pulley pads when the bed is flat. When the massage function is activated, the repeated impact between the pulleys and pulley pads causes abnormal noise. To solve this problem, the industry generally uses methods such as wrapping the pulley's load-bearing surface with a layer of velvet or soft rubber; or attaching sound-absorbing cotton or velvet to the pulley pads. However, because the wrapped velvet or soft rubber is not wear-resistant, it is easily worn after a period of heavy operation, thus reducing its service life. At the same time, the gap problem between the pulleys and pulley pads still exists, and the impact noise problem persists. Utility Model Content

[0003] The embodiments of this utility model provide a drive structure and an electric bed that solves the problem of abnormal noise from the pulleys and pulley pads, and improves service life.

[0004] This utility model provides a driving structure, which includes:

[0005] A pulley, comprising a load-bearing wheel and a limiting wheel with a diameter smaller than that of the load-bearing wheel, wherein the limiting wheel is rotatably connected to one side of the load-bearing wheel;

[0006] The pad includes load-bearing edges and limiting edges that are spaced apart and opposite to each other;

[0007] The load-bearing wheel is slidably connected to the load-bearing side, the limiting wheel is located between the load-bearing side and the limiting side and is slidably connected to the limiting side, the limiting side is interference-fitted with the limiting wheel and applies a force toward the load-bearing side to the limiting wheel.

[0008] In the drive structure provided by this utility model, the width of the limiting side is smaller than the width of the bearing side, and the distance from the limiting side to the bearing side is smaller than the diameter of the load-bearing wheel. The load-bearing wheel is located on one side of the limiting side.

[0009] In the driving structure provided by this utility model, the pad further includes a support edge, and the two ends of the support edge are respectively perpendicularly connected to the load-bearing edge and the limiting edge.

[0010] In the drive structure provided by this utility model, the limiting wheel has a fixing hole in the middle that passes through both sides, the load-bearing wheel has a mounting hole in the middle that passes through both sides, the drive structure also includes a fixing member and a pin, the fixing member is fixed in the fixing hole, and one end of the pin passes through the mounting hole and is locked and fixed to the fixing member.

[0011] In the driving structure provided by this utility model, the limiting wheel is provided with a plurality of through holes penetrating both sides thereon, and the plurality of through holes are spaced around the fixing hole along the circumference of the limiting wheel.

[0012] In the drive structure provided by this utility model, the load-bearing wheel is provided with a groove on the outside of the mounting hole along its circumference, and the load-bearing wheel is also provided with a plurality of reinforcing ribs. The plurality of reinforcing ribs are spaced apart in the groove along its circumference, and the two ends of the reinforcing ribs are respectively fixedly connected to the two sides of the groove.

[0013] In the driving structure provided by this utility model, the driving structure further includes a driving bracket, the driving bracket is provided with a connecting hole, and one end of the pin passes through the connecting hole and the mounting hole in sequence and is locked and fixed to the fixing member.

[0014] In the driving structure provided by this utility model, the fixing component is made of plastic.

[0015] In the drive structure provided by this utility model, the limiting wheel is made of rubber.

[0016] In the drive structure provided by this utility model, the load-bearing wheel is made of PA66 and GF materials.

[0017] This utility model also provides an electric bed, which includes:

[0018] bed board;

[0019] A drive structure, wherein the drive structure is any one of the drive structures described above, and the pad is fixedly connected to the bed board.

[0020] In the electric bed provided by this utility model, the load-bearing side is provided with a first fastening hole, and the bed board is provided with a second fastening hole. The second fastening hole and the first fastening hole are arranged opposite to each other. The pad and the bed board are fastened and fixed by a locking member passing through the first fastening hole and the second fastening hole.

[0021] This application involves rotatably connecting the limiting wheel to one side of the load-bearing wheel, and applying pressure towards the load-bearing side to the limiting wheel via the limiting edge. This causes the limiting wheel to transmit the pressure to the load-bearing wheel, thereby causing the load-bearing wheel to be subjected to pressure towards the load-bearing side. This eliminates the gap between the load-bearing wheel and the load-bearing side, thus avoiding the problem of impact noise between the load-bearing wheel and the pad. Furthermore, it eliminates the need for using velour or soft rubber, thereby increasing the service life of the drive structure. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figures 1a-1b This is a partial structural diagram of the driving structure at various angles in an embodiment of this utility model;

[0024] Figure 2 This is a partially exploded view of the driving structure in an embodiment of this utility model;

[0025] Figure 3 This is an overall structural diagram of the driving structure in an embodiment of this utility model;

[0026] Figure 4 This is a partial structural diagram of the electric bed in an embodiment of this utility model;

[0027] Figure 5 This is another structural diagram of the electric bed in this embodiment of the present invention.

[0028] The labels for the attached figures are as follows:

[0029] 1. Load-bearing wheel; 11. Mounting hole; 12. Groove; 13. Reinforcing rib; 2. Limiting wheel; 21. Fixing hole; 22. Through hole; 3. Pad; 31. Load-bearing edge; 32. Limiting edge; 33. Supporting edge; 34. First fastening hole; 41. Fixing component; 42. Pin; 5. Drive bracket; 6. Bed board; 61. Locking component. Detailed Implementation

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0031] Reference Figures 1a to 5The diagram illustrates an embodiment of the drive structure and electric bed of this invention. The drive structure includes pulleys and a pad 3. The pulleys include a load-bearing wheel 1 and a limiting wheel 2 with a diameter smaller than that of the load-bearing wheel 1. The limiting wheel 2 is rotatably connected to one side of the load-bearing wheel 1. The pad 3 includes a load-bearing edge 31 and a limiting edge 32 spaced apart and opposite to each other. The load-bearing wheel 1 is slidably connected to the load-bearing edge 31, and the limiting wheel 2 is located between the load-bearing edge 31 and the limiting edge 32 and is slidably connected to the limiting edge 32. The limiting edge 32 is interference-fitted with the limiting wheel 2 and applies a force toward the load-bearing edge 31 to the limiting wheel 2.

[0032] Specifically, the drive structure is used as a sliding drive structure for mechanical structural components, thereby enabling the mechanical structural components to slide. For example, in the lifting structure of the leg structure in an electric bed / electric chair, the drive structure is designed on the connecting rod and the bed board 6 to allow the connecting rod to slide on the bed board 6, thereby adjusting the posture change of the bed board 6.

[0033] The driving structure includes a pulley and a pad 3. The pulley is used to connect the structural component that needs to slide, and the pad 3 serves as a sliding guide and load-bearing component for the pulley, allowing the pulley to slide on the pad 3. The pulley includes a load-bearing wheel 1 and a limiting wheel 2. The load-bearing wheel 1 is used to connect with the structural component that needs to slide, thereby driving the structural component to slide. The limiting wheel 2 is used to limit the position of the load-bearing wheel 1 to avoid a gap between the load-bearing wheel 1 and the pad 3. The diameter of the load-bearing wheel 1 is larger than the diameter of the limiting wheel 2, and the horizontal center line of the load-bearing wheel 1 is consistent with the horizontal center line of the limiting wheel 2. The limiting wheel 2 is located on one side of the load-bearing wheel 1 and is rotatably connected to the load-bearing wheel 1. Therefore, when the load-bearing wheel 1 rotates, it will drive the limiting wheel 2 to rotate.

[0034] The pad 3 includes a load-bearing edge 31 and a limiting edge 32. The load-bearing edge 31 and the limiting edge 32 are horizontally and spaced apart from each other. The load-bearing edge 31 is used to guide the load-bearing wheel 1, that is, the load-bearing wheel 1 slides on the load-bearing edge 31. The limiting edge 32 is used to apply a force to the limiting wheel 2 toward the load-bearing edge 31, thereby limiting the limiting wheel 2 and thus limiting the load-bearing wheel 1, so as to avoid the gap between the load-bearing wheel 1 and the load-bearing edge 31 and the abnormal noise.

[0035] The load-bearing wheel 1 is slidably connected to the load-bearing edge 31, and the limiting wheel 2 is located between the load-bearing edge 31 and the limiting edge 32. The limiting wheel 2 is also slidably connected to the limiting edge 32. Therefore, when the load-bearing wheel 1 slides along the length direction of the load-bearing edge 31, it will drive the limiting wheel 2 to slide along the length direction of the limiting edge 32. Furthermore, the limiting edge 32 and the limiting wheel 2 are interference-fitted, and the limiting edge 32 applies a force to the limiting wheel 2 toward the load-bearing edge 31. Therefore, regardless of the load-bearing wheel 1 and the limiting wheel 2, the load-bearing wheel 1 will slide along the length direction of the limiting edge 31. Whether the limiting wheel 2 is stationary or sliding, it will be subjected to pressure from the limiting edge 32 towards the bearing edge 31. This pressure is transmitted to the bearing wheel 1, causing it to move towards the bearing edge 31 and thus ensuring it is in close contact with the bearing edge 31. This prevents gaps between the bearing wheel 1 and the bearing edge 31, effectively avoiding any abnormal noise caused by the bearing wheel 1 impacting the pad 3.

[0036] This application achieves this by rotatably connecting the limiting wheel 2 to one side of the load-bearing wheel 1, and applying pressure toward the bearing edge 31 to the limiting wheel 2 via the limiting edge 32, so that the limiting wheel 2 transmits the pressure to the load-bearing wheel 1, thereby causing the load-bearing wheel 1 to be subjected to pressure toward the bearing edge 31, thus eliminating the gap between the load-bearing wheel 1 and the bearing edge 31, thereby avoiding the problem of impact noise between the load-bearing wheel 1 and the pad 3, and eliminating the need to use velvet or soft rubber, thus improving the service life of the drive structure.

[0037] In one embodiment, reference is made to Figures 1a to 3As shown, the width of the limiting edge 32 is smaller than the width of the bearing edge 31, and the distance from the limiting edge 32 to the bearing edge 31 is smaller than the diameter of the load-bearing wheel 1. The load-bearing wheel 1 is located on one side of the limiting edge 32. Specifically, the limiting edge 32 and the bearing edge 31 are horizontally and spaced apart from each other. In this embodiment, the limiting edge 32 is horizontally positioned above the bearing edge 31. The length directions of the limiting edge 32 and the bearing edge 31 are consistent. The width of the limiting edge 32 is smaller than the width of the bearing edge 31, and the distance from the limiting edge 32 to the bearing edge 31 is smaller than the diameter of the load-bearing wheel 1. Therefore, the load-bearing wheel 1 is positioned on one side of the limiting edge 32, and the side of the load-bearing wheel 1 connected to the limiting wheel 2 is installed towards the limiting edge 32. The limiting wheel 2 is embedded between the limiting edge 32 and the bearing edge 31, and the upper surface of the limiting wheel 2 is in contact with the limiting edge 32. This causes the limiting edge 32 to apply pressure towards the bearing edge 31 to the limiting wheel 2, causing the limiting wheel 2 to move towards the bearing edge 31. The limiting wheel 2 transmits the pressure to the load-bearing wheel 1, which is then subjected to pressure towards the bearing edge 31, causing the load-bearing wheel 1 to move towards the bearing edge 31. This eliminates the gap between the load-bearing wheel 1 and the bearing edge 31, effectively preventing abnormal noise caused by the impact between the load-bearing wheel 1 and the bearing edge 31. At the same time, when the load-bearing wheel 1 slides along the length of the bearing edge 31, it will drive the limiting wheel 2 to slide along the length of the limiting edge 32, thereby improving the stability and smoothness of the drive structure during operation.

[0038] More specifically, the width of the limiting edge 32 is greater than the thickness of the limiting wheel 2, thereby improving the stability and smoothness of the limiting wheel 2 when sliding on the limiting edge 32, preventing the limiting wheel 2 from detaching from the limiting edge 32, and improving the structural stability and service life of the drive structure.

[0039] In a specific embodiment, refer to Figure 2As shown, the pad 3 further includes a support edge 33, the two ends of which are perpendicularly connected to the load-bearing edge 31 and the limiting edge 32, respectively. Specifically, the pad 3 further includes a support edge 33, which connects the load-bearing edge 31 and the limiting edge 32, and supports the limiting edge 32 on one side of the load-bearing edge 31, so that the limiting edge 32 and the load-bearing edge 31 are horizontally spaced opposite each other; the two ends of the support edge 33 are respectively connected to the load-bearing edge 31 and the limiting edge 32, and the support edge 33 is perpendicularly connected to both the load-bearing edge 31 and the limiting edge 32, thus making the load-bearing edge 31 and the limiting edge 32... The structure is horizontally positioned, ensuring that the distance between the load-bearing edge 31 and the limiting edge 32 remains constant. Specifically, the height of the supporting edge 33 determines the distance between the load-bearing edge 31 and the limiting edge 32. This ensures an interference fit between the limiting edge 32 and the limiting wheel 2, maintaining a constant pressure exerted by the limiting edge 32 on the limiting wheel 2. This improves the structural stability of the limiting edge 32 and the limiting wheel 2, thereby enhancing the structural stability of the drive structure and extending its service life.

[0040] In a specific embodiment, refer to Figures 1a to 3 As shown, the limiting wheel 2 has a fixing hole 21 extending through both sides in the middle, and the load-bearing wheel 1 has a mounting hole 11 extending through both sides in the middle. The driving structure also includes a fixing member 41 and a pin 42. The fixing member 41 is fixed in the fixing hole 21, and one end of the pin 42 passes through the mounting hole 11 and is locked to the fixing member 41. Specifically, the limiting wheel 2 has a fixing hole 21 extending through both sides of the limiting wheel 2, and the load-bearing wheel 1 has a mounting hole 11 extending through both sides of the load-bearing wheel 1. The mounting hole 11 and the fixing hole 21 are opposite to each other and communicate with each other. The driving structure also includes a fixing member 41 and a pin 42. The fixing member 41 is fixed in the fixing hole 21 and is used to lock the pin 42. The pin 42 is used to connect the load-bearing wheel 1 and the limiting wheel 2. One end of wheel 2 passes through the mounting hole 11 of the load-bearing wheel 1 and enters the fixing hole 21 of the limiting wheel 2, and is locked and fixed with the fixing member 41 in the fixing hole 21, thereby realizing the connection between the load-bearing wheel 1 and the limiting wheel 2. The connection method is simple and low cost. At the same time, when the limiting wheel 2 is subjected to the pressure of the limiting edge 32, the pressure will be transmitted to the load-bearing wheel 1 through the pin 42, so that the load-bearing wheel 1 is in close contact with the load-bearing edge 31, thereby improving the structural stability of the drive structure and the stability of pressure transmission.

[0041] In one embodiment, reference is made to Figure 2As shown, the limiting wheel 2 has multiple through holes 22 penetrating both sides of it. These through holes 22 are spaced around the fixing hole 21 along the circumference of the limiting wheel 2. Specifically, the limiting wheel 2 also has multiple through holes 22 penetrating both sides of the limiting wheel 2, and these through holes 22 are spaced around the fixing hole 21 along the circumference of the limiting wheel 2. This further improves the elasticity of the limiting wheel 2, making it easier to transmit the pressure of the limiting wheel 2 to the load-bearing wheel 1, while simultaneously reducing production costs.

[0042] In a specific embodiment, refer to Figure 2 As shown, the load-bearing wheel 1 has a groove 12 on the outside of the mounting hole 11 along its circumference. The load-bearing wheel 1 also has a plurality of reinforcing ribs 13. The plurality of reinforcing ribs 13 are spaced apart in the groove 12 along its circumference, and the two ends of the reinforcing ribs 13 are respectively fixedly connected to the two sides of the groove 12. Specifically, the side of the load-bearing wheel 1 is also provided with an inwardly recessed groove 12, which is arranged along the circumference of the load-bearing wheel 1 and is located outside the mounting hole 11. The load-bearing wheel 1 is also provided with a plurality of reinforcing ribs 13, which are used to strengthen the structural strength of the load-bearing wheel 1. The plurality of reinforcing ribs 13 are spaced apart along the circumference of the groove 12 and the two ends of the reinforcing ribs 13 are respectively fixedly connected to the two groove walls of the groove 12. That is, the reinforcing ribs 13 extend along the width direction of the groove 12, so that the outer side of the load-bearing wheel 1 has a plurality of reinforcing ribs 13 to improve the structural strength of the load-bearing wheel 1 and improve the service life of the load-bearing wheel 1.

[0043] More specifically, the load-bearing wheel 1 is provided with the groove 12 and the reinforcing rib 13 on both the left and right sides to improve the structural strength of the load-bearing wheel 1.

[0044] In a specific embodiment, refer to Figures 3 to 5As shown, the driving structure also includes a driving bracket 5, which has a connecting hole. One end of the pin 42 passes through the connecting hole and the mounting hole 11 in sequence and is locked and fixed to the fixing member 41. Specifically, the driving structure also includes a driving bracket 5, which is used to drive the sliding of the load-bearing wheel 1. The driving bracket 5 and the load-bearing wheel 1 are connected by the pin 42. The driving bracket 5 and the limiting wheel 2 are located on both sides of the load-bearing wheel 1. The driving bracket 5 has a connecting hole, which corresponds to the mounting hole 11. One end of the pin 42 passes through the connecting hole and the mounting hole 11 and is locked and fixed to the fixing member 41, thereby fixing the driving bracket 5, the load-bearing wheel 1, and the limiting wheel 2 together so that the driving bracket 5 drives the load-bearing wheel 1 and the limiting wheel 2 to slide. The connection method is simple, the installation and disassembly are convenient, and the cost is low.

[0045] In one embodiment, the fastener 41 is made of plastic. Specifically, "plastic" is a common name for "plastic," which is a synthetic material made primarily of high-molecular synthetic resins (such as polyethylene, polypropylene, polyvinyl chloride, etc.), with various additives (such as plasticizers, stabilizers, fillers, colorants, etc.), and processed under certain temperature and pressure. Plastic materials are lightweight, high-strength, highly stable, and low-cost. Using plastic for the fastener 41 improves its strength and stability, thereby increasing its service life. Simultaneously, when the fastener 41 is fixed to the limiting wheel 2, it reduces the weight of the limiting wheel 2, making it easier for the limiting edge 32 to apply pressure to the limiting wheel 2, and also reduces costs.

[0046] In one embodiment, the limiting wheel 2 is made of rubber. Specifically, rubber is a polymer material with high elasticity, flexibility, and durability. The limiting wheel 2 is made of rubber, thereby improving its elasticity. This allows the limiting edge 32 to apply pressure towards the load-bearing edge 31 when the contact surface of the limiting wheel 2 is deformed by compression. Consequently, the load-bearing wheel 1 is subjected to pressure to tightly adhere to the load-bearing edge 31. The high elasticity and durability of the limiting wheel 2 ensure that the load-bearing wheel 1 can withstand pressure, further preventing abnormal noise and improving the service life of the limiting wheel 2.

[0047] In one embodiment, the load-bearing wheel 1 is made of PA66 and GF materials. Specifically, PA66 and GF materials are a polymer composite material composed of polyamide 66 (PA66) and glass fiber (GF). PA66, also known as nylon 66, is a semi-crystalline engineering plastic with excellent thermal and chemical stability, high hardness, high tensile strength, high compressive strength, and high elastic modulus. It also has good wear resistance and self-lubricating properties. GF, or glass fiber reinforced material, is an inorganic non-metallic material whose main component is silicate mineral. The main function of glass fiber is to improve the strength and stiffness of the material, while reducing the coefficient of thermal expansion and improving heat resistance and dimensional stability. Therefore, the load-bearing wheel 1 is made of PA66+GF material, which gives the load-bearing wheel 1 the advantages of high strength, high rigidity, good heat resistance, good dimensional stability, good wear resistance and self-lubrication, and light weight, thereby improving the service life of the load-bearing wheel 1, avoiding easy wear of the load-bearing wheel 1, and thus improving the service life of the drive structure; at the same time, it improves the smoothness of sliding of the load-bearing wheel 1 and makes the drive structure lighter.

[0048] More specifically, the load-bearing wheel in this embodiment is made of PA66+25%GF material to enhance the nylon injection-molded load-bearing wheel body and improve its service life.

[0049] Reference Figures 4 to 5 As shown, this application also provides an electric bed, which includes a bed board 6 and the drive structure. The drive structure is any of the drive structures described above. Since the drive structure has been described in detail in the above embodiments, it will not be described again here. The pad 3 is fixedly connected to the bed board 6.

[0050] Specifically, the electric bed includes a bed board 6 and a drive structure. The drive structure is used to assist in adjusting the posture of the bed board 6. The pad 3 of the drive structure is fixedly connected to the bed board 6. Since the abnormal noise of the load-bearing wheels 1 and the pad 3 of the drive structure is eliminated, the quiet performance of the electric bed is improved, thereby improving the user experience. At the same time, the drive structure has a long service life, thereby improving the service life of the electric bed.

[0051] In one embodiment, reference is made to Figure 5As shown, the load-bearing edge 31 is provided with a first fastening hole 34, and the bed board 6 is provided with a second fastening hole. The second fastening hole and the first fastening hole 34 are arranged opposite to each other. The pad 3 and the bed board 6 are fastened and fixed by a locking member 61 passing through the first fastening hole 34 and the second fastening hole. Specifically, the load-bearing edge 31 is provided with a first fastening hole 34, which extends through the upper and lower sides of the load-bearing edge 31. The bed board 6 is provided with a second fastening hole, which extends through the upper and lower sides of the bed board 6. The second fastening hole and the first fastening hole 34 are arranged opposite to each other. After one end of the locking member 61 passes through the second fastening hole and the first fastening hole 34, it is fastened and fixed, thereby fixing the pad 3 and the bed board 6. The connection method is simple and low in cost.

[0052] More specifically, the first fastening hole 34 is provided on both sides of the load-bearing edge 31, so the load-bearing edge 31 is provided with two first fastening holes 34 and the bed board 6 is provided with two second fastening holes to improve the fixing strength between the pad 3 and the bed board 6.

[0053] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A driving structure, characterized in that, include: A pulley, comprising a load-bearing wheel and a limiting wheel with a diameter smaller than that of the load-bearing wheel, wherein the limiting wheel is rotatably connected to one side of the load-bearing wheel; The pad includes load-bearing edges and limiting edges that are spaced apart and opposite to each other; The load-bearing wheel is slidably connected to the load-bearing side, the limiting wheel is located between the load-bearing side and the limiting side and is slidably connected to the limiting side, the limiting side is interference-fitted with the limiting wheel and applies a force toward the load-bearing side to the limiting wheel.

2. The driving structure according to claim 1, characterized in that, The width of the limiting edge is less than the width of the bearing edge, and the distance from the limiting edge to the bearing edge is less than the diameter of the load-bearing wheel. The load-bearing wheel is located on one side of the limiting edge.

3. The driving structure according to claim 1, characterized in that, The pad also includes a support edge, the two ends of which are perpendicularly connected to the load-bearing edge and the limiting edge, respectively.

4. The driving structure according to claim 1, characterized in that, The limiting wheel has a fixing hole in the middle that passes through both sides, and the load-bearing wheel has a mounting hole in the middle that passes through both sides. The driving structure also includes a fixing member and a pin. The fixing member is fixed in the fixing hole, and one end of the pin passes through the mounting hole and is locked and fixed to the fixing member.

5. The driving structure according to claim 4, characterized in that, The limiting wheel is provided with multiple through holes that extend through both sides of it, and the multiple through holes are spaced around the fixing hole along the circumference of the limiting wheel.

6. The driving structure according to claim 4, characterized in that, The load-bearing wheel has a groove on the outside of the mounting hole along its circumference. The load-bearing wheel also has a plurality of reinforcing ribs, which are spaced apart in the groove along its circumference, and the two ends of the reinforcing ribs are respectively fixedly connected to the two sides of the groove.

7. The driving structure according to claim 4, characterized in that, The drive structure also includes a drive bracket, which has a connecting hole. One end of the pin passes through the connecting hole and the mounting hole in sequence and is locked and fixed to the fastener.

8. The driving structure according to claim 4, characterized in that, The fastener is made of plastic.

9. The driving structure according to claim 1, characterized in that, The limiting wheel is made of rubber.

10. The driving structure according to claim 1, characterized in that, The load-bearing wheels are made of PA66 and GF materials.

11. An electric bed, characterized in that, include: bed board; A drive structure, wherein the drive structure is any one of claims 1-10, and the pad is fixedly connected to the bed board.

12. The electric bed according to claim 11, characterized in that, The load-bearing side is provided with a first fastening hole, and the bed board is provided with a second fastening hole. The second fastening hole and the first fastening hole are arranged opposite to each other. The pad and the bed board are fastened and fixed by a locking member passing through the first fastening hole and the second fastening hole.

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