Nursing electric power-assisted trolley

Abstract

The invention relates to the technical field of nursing trolleys, in particular to a nursing electric power-assisted trolley which comprises a transportation control shell and a nursing box fixedly mounted at the top of the transportation control shell, two front wheels and two rear wheels are arranged below the transportation control shell, and a supporting unit matched with the rear wheels is mounted on the transportation control shell; the rear wheel is fixedly connected with a rotating shaft; the transportation control shell is provided with a separated driving assembly used for driving the two rotating shafts to rotate, and the transportation control shell is provided with an angle control mechanism used for adjusting the angles of the two front wheels. When the vehicle needs to turn around in situ, the rear wheels are lifted away from the ground through the height control structure, the whole vehicle is switched to be supported by the steerable front wheels and the universal wheels, the problem that a traditional four-wheel drive or fixed rear wheel structure is difficult to steer in a narrow space is solved through the design, and maneuverability of equipment in narrow environments such as wards and elevators is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of nursing trolley technology, and more particularly to a nursing electric-assisted trolley. Background Technology

[0002] Currently, electric-assisted nursing trolleys are widely used in the medical and nursing field, primarily for transporting medications, medical devices, patient records, and as mobile nursing workstations. Existing nursing trolleys typically include a body, multiple casters located at the bottom of the body, and a motor assembly for drive. To facilitate movement in narrow ward corridors and elevator lobbies, some trolleys utilize swivel casters.

[0003] However, existing technologies still have shortcomings in practical applications. First, they are limited in terms of turning flexibility in confined spaces. Traditional handcarts are mostly four-wheeled structures, and even if the front wheels can swing, their turning radius is still relatively large. In bedside rooms, treatment rooms, or crowded elevators, operators often need to move back and forth repeatedly to turn around, which not only increases labor intensity but also reduces work efficiency. Second, they have significant deficiencies in parking stability. Existing technologies mostly use caster brake devices, which lock the casters with brake pads to prevent them from rotating. However, because the contact area between the casters and the ground is small, and the braking mechanism can only restrict rolling and not completely restrict swinging, the handcart is still prone to shaking or displacement when subjected to slight external forces (such as people leaning on it, uneven ground, or cables tripping). For handcarts storing precision medical instruments, fragile medicines, or opened infusion bottles, such shaking may cause equipment damage or medicine spillage, posing serious safety hazards. In addition, relying on brake pads for parking for extended periods can cause localized tire deformation or brake pad wear, affecting the stability and lifespan of the handcart.

[0004] Therefore, in order to solve the above problems, a more suitable facility that meets the needs of users is needed. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a nursing electric-assisted handcart to solve the problem that operators often need to move back and forth repeatedly to turn around in bedside, treatment room or crowded elevator.

[0006] To achieve the above objectives, the present invention provides a nursing electric-assisted handcart, comprising a transport control shell and a nursing box fixedly installed on the top of the transport control shell. The transport control shell is provided with two front wheels and two rear wheels below it. A support unit that cooperates with the rear wheels is installed on the transport control shell, and a rotating shaft is fixedly connected to the rear wheels. The transport control housing is equipped with a separate drive assembly for driving the two rotating shafts to rotate, an angle control mechanism for adjusting the angle of the two front wheels, a height control structure that cooperates with the two rotating shafts, and a universal wheel rotatably connected to the bottom of the transport control housing.

[0007] Optionally, the separate drive assembly includes a support shell fixedly installed at the bottom of the transport control housing. The inner walls of both sides of the support shell are respectively provided with clearance holes that mate with two rotating shafts. A first support shaft is rotatably connected to the support shell. A first bevel gear located inside the support shell is fixedly connected to the first support shaft. A second bevel gear meshing with the first bevel gear is provided inside the support shell, and the second bevel gear is fixedly sleeved on the outside of a corresponding rotating shaft. A synchronizing ball is fixedly connected to one of the rotating shafts, and a first sliding groove is provided on the other rotating shaft. A first prism is slidably arranged in the first sliding groove. One end of the first prism is connected to the inner wall of the first sliding groove by a first compression spring. A pressing plate is fixedly connected to the other end of the first prism, and a groove mates with the synchronizing ball is provided on the pressing plate. A driver that mates with the first support shaft is installed on the transport control housing.

[0008] Optionally, the driver includes a motor mount fixedly installed at the bottom of the transport control housing, a servo motor fixedly connected to the motor mount, a first synchronous pulley fixedly connected to the output end of the servo motor, a second slide groove opened on the side of the first support shaft facing the first synchronous pulley, a second prism slidably arranged in the second slide groove, one end of the second prism being connected to the inner wall of the second slide groove by a second compression spring, and a connecting shaft fixedly connected to the other end of the second prism, on which a second synchronous pulley in contact with the first synchronous pulley is fixedly connected.

[0009] Optionally, a movable seat is rotatably fitted on the outside of the connecting shaft, a first guide post passes through the movable seat and is fixedly connected to the motor seat, a support post is fixedly connected to the movable seat, a control rod passes through the transport control housing, a limit plate is fixedly connected to the bottom of the control rod, a limit groove adapted to the support post is opened at the bottom of the limit plate, and the cavity shape of the limit groove is a frustum-shaped structure, a sliding frame is rotatably fitted on the outside of the control rod, and the sliding frame is slidably connected to the nursing box, and a magnetic suction component adapted to the nursing box is installed on the control rod.

[0010] Optionally, the magnetic component includes a magnetic ring fixedly sleeved on the outside of the control rod, two iron plates are fixedly connected to the nursing box, the control rod passes through the two iron plates, and the magnetic ring is located between the two iron plates.

[0011] Optionally, a turntable is fixedly connected to the top of the control lever, and a speed reduction plate is provided above the rotating shaft. The speed reduction plate and the sliding frame are fixedly connected by a pressing frame.

[0012] Optionally, the angle control mechanism includes a rotating sleeve fitted outside the control rod, and the rotating sleeve is rotatably connected to the transport control housing. Several guide strips are fixedly connected to the control rod, and several guide grooves that cooperate with the guide strips are opened on the inner wall of the rotating sleeve. A rotating plate is rotatably connected inside the transport control housing, and a translation frame is provided inside the transport control housing. Several first support sleeves are slidably fitted outside the translation frame, and the first support sleeves are fixedly connected to the inner wall of the transport control housing. First movable columns are fixedly connected to both the rotating sleeve and the translation frame. First rectangular holes are opened at both ends of the rotating plate, and two first movable columns are respectively located in two first rectangular holes. A second support shaft is fixedly connected to the top of the front wheel, and the second support shaft is rotatably connected to the transport control housing. A second movable column located inside the transport control housing is fixedly connected to the second support shaft. Second rectangular holes are opened at both ends of the translation frame, and the second movable column is slidably installed in the corresponding second rectangular hole.

[0013] Optionally, the transport control housing is provided with a movable plate, through which several second guide posts pass. The second guide posts are fixedly connected to the inner wall of the transport control housing. A third compression spring is sleeved on the outside of the second guide posts. The two ends of the third compression spring are fixedly connected to the movable plate and the inner wall of the transport control housing, respectively. A positioning block is fixedly connected to the side of the movable plate away from the third compression spring. Several positioning slots that cooperate with the positioning blocks are opened on the translation frame.

[0014] Optionally, the height control structure includes a swing frame rotatably sleeved outside the rotating shaft, and the swing frame and the first support shaft are rotatably connected. An adjustment component adapted to the rotating shaft is installed on the transport control housing.

[0015] Optionally, the adjusting component includes a support frame rotatably sleeved outside the rotating shaft, a slide plate rotatably connected to the support frame, a second support sleeve slidably sleeved outside the slide plate, and two hydraulic telescopic rods fixedly connected to the transport control housing, with the telescopic ends of the two hydraulic telescopic rods respectively fixedly connected to the corresponding second support sleeves.

[0016] Optionally, the support unit includes several bases disposed below the transport control housing. A threaded post is fixedly connected to the top of the base, and a threaded sleeve is fitted onto the outer thread of the threaded post. The top of the threaded sleeve is fixedly connected to the bottom of the transport control housing.

[0017] The beneficial effects of this invention are as follows: During normal transport, the rear wheels act as drive wheels, contacting the ground and providing stable driving force for the trolley. When a turnaround is required, the height control structure lifts the rear wheels off the ground, allowing the entire vehicle to switch to being supported by the steerable front wheels and swivel wheels. This design solves the problem of difficult steering in confined spaces with traditional four-wheel drive or fixed rear wheel structures, greatly improving the mobility of the equipment in narrow environments such as wards and elevators. When a short-term stop is required, such as during nursing procedures, the height control structure can first drive the rear wheels down, then drive the bottom of the support unit to a position lower than the bottom of the swivel wheels, and finally raise the rear wheels. At this point, the entire vehicle is in contact with the ground via the support unit. Compared to the traditional method of locking the rollers only with brakes, the support unit greatly increases the contact area and friction between the trolley and the ground, forming a stable support. This provides a stable platform for placing precision medical instruments or easily shaken nursing fluids, preventing the risk of tipping over or spilling. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is one of the overall structural schematic diagrams of an embodiment of the present invention; Figure 2 This is a second schematic diagram of the overall structure of an embodiment of the present invention; Figure 3 This is a schematic diagram of the internal structure of the transport control shell according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the translation frame according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the movable plate in an embodiment of the present invention; Figure 6 This is a schematic diagram of the front wheel structure according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the rotating plate according to an embodiment of the present invention; Figure 8 This is a cross-sectional structural diagram of the limiting disc according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the speed reducer according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of the adjustment component according to an embodiment of the present invention; Figure 11 This is a schematic diagram of the split structure of the second prism and the first support axis according to an embodiment of the present invention; Figure 12 This is a schematic diagram of the internal structure of the support shell according to an embodiment of the present invention; Figure 13 This is a schematic diagram of the structure of the first prism and the rotating shaft in an embodiment of the present invention.

[0020] The diagram is marked as follows: 1. Transport control housing; 2. Nursing box; 3. Front wheel; 4. Rotating sleeve; 5. Rear wheel; 6. Support housing; 7. Rotating shaft; 8. First support shaft; 9. First bevel gear; 10. Second bevel gear; 11. First slide groove; 12. First prism; 13. First compression spring; 14. Pressing plate; 15. Groove; 16. Synchronizing ball; 17. Connecting shaft; 18. Motor base; 19. Servo motor; 20. First synchronous pulley; 21. Second synchronous pulley; 22. Second slide groove; 23. Second prism; 24. Second compression spring; 25. Movable seat; 26. First guide post; 27. Support post; 28. Control rod; 29. ​​Limiting plate; 30. Limiting groove; 31. Sliding frame 32. Magnetic ring; 33. Iron plate; 34. Guide strip; 35. Guide groove; 36. Rotating plate; 37. Translation frame; 38. First support sleeve; 39. First rectangular hole; 40. First movable column; 41. Second support shaft; 42. Second movable column; 43. Second rectangular hole; 44. Movable plate; 45. Second guide column; 46. Third compression spring; 47. Positioning block; 48. Positioning groove; 49. Turntable; 50. Pressing frame; 51. Speed ​​reduction plate; 52. Swing frame; 53. Support frame; 54. Slide plate; 55. Second support sleeve; 56. Hydraulic telescopic rod; 57. Threaded column; 58. Threaded sleeve; 59. Base; 60. Universal wheel; 61. Clearance hole. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0022] Example 1, by Figure 1 , Figure 2 , Figure 3 and Figure 10 The present invention includes a transport control housing 1 and a nursing box 2 fixedly installed on the top of the transport control housing 1. Two front wheels 3 and two rear wheels 5 are provided below the transport control housing 1. A support unit that cooperates with the rear wheels 5 is installed on the transport control housing 1. A rotating shaft 7 is fixedly connected to the rear wheels 5. The transport control housing 1 is equipped with a separate drive assembly for driving the two rotating shafts 7 to rotate. The transport control housing 1 also has an angle control mechanism for adjusting the angles of the two front wheels 3, and a height control structure that cooperates with the two rotating shafts 7. A caster wheel 60 is rotatably connected to the bottom of the transport control housing 1. The rotating shafts 7 are driven to rotate by the separate drive assembly, which in turn drives the rear wheels 5 to rotate. The rear wheels 5 then drive the transport control housing 1 and the nursing box 2 to move. By controlling the angles of the two front wheels 3 through the angle control mechanism, the movement of the transport control housing 1 and the nursing box 2 can be changed. When the direction of movement requires the transport control housing 1 and nursing box 2 to turn around, the height control structure drives the rear wheel 5 upward through the pivot 7 so that the rear wheel 5 is no longer in contact with the ground. At this time, the front wheel 3 and the caster 60 support the transport control housing 1 and nursing box 2. The front wheel 3, which can control the direction, and the caster 60, which can rotate freely, facilitate the turning of the transport control housing 1 and nursing box 2. When it is necessary to stop the movement of the transport control housing 1 and nursing box 2 within a certain period of time, the height control structure drives the rear wheel 5 downward through the pivot 7, and then the caregiver controls the support unit to descend. The support unit is moved so that its bottom horizontal position is lower than that of the caster wheel 60. Finally, the height control structure drives the rear wheel 5 upward through the pivot 7. This allows the support unit to support the transport control shell 1 and the nursing box 2, preventing them from swaying relative to the ground due to non-human factors. The support unit directly positions the rear wheel 5 and the front wheel 3, increasing the contact area between the trolley and the ground, thus reducing the possibility of the trolley swaying relative to the ground. During normal transport, the rear wheel 5 acts as the drive wheel, providing stable drive for the trolley. When a turnaround is needed, the height control structure lifts the rear wheels 5 off the ground, switching the entire vehicle to be supported by the steerable front wheels 3 and the swivel wheels 60. This design solves the problem of difficult steering in confined spaces with traditional four-wheel drive or fixed rear wheel structures, greatly improving the mobility of the equipment in narrow environments such as wards and elevators. When a short-term stop is needed, such as during nursing procedures, the height control structure can first drive the rear wheels 5 down, then drive the bottom of the support unit to be lower than the bottom of the swivel wheels 60, and finally lift the rear wheels 5. At this time, the entire vehicle is in contact with the ground by the support unit. Compared with the traditional method of locking the rollers with brakes, the support unit greatly increases the contact area and friction between the trolley and the ground, forming a stable support. This provides a stable platform for placing precision medical instruments or easily shaken nursing fluids, preventing the risk of tipping or spillage.

[0023] Example 2, based on Example 1, is... Figure 3 , Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 and Figure 13The separate drive assembly includes a support shell 6 fixedly mounted on the bottom of the transport control shell 1. The inner walls of both sides of the support shell 6 are respectively provided with clearance holes 61 that mate with two rotating shafts 7. A first support shaft 8 is rotatably connected to the support shell 6. A first bevel gear 9 located inside the support shell 6 is fixedly connected to the first support shaft 8. A second bevel gear 10 meshing with the first bevel gear 9 is provided inside the support shell 6, and the second bevel gear 10 is fixedly sleeved on the outside of a corresponding rotating shaft 7. A synchronizing ball 16 is fixedly connected to one of the rotating shafts 7, and a first sliding groove 11 is provided on the other rotating shaft 7. A first prism 12 is slidably arranged within the first sliding groove 11. One end of the first prism 12 is connected to the inner wall of the first slide groove 11 by a first compression spring 13. The other end of the first prism 12 is fixedly connected to a pressing plate 14, and the pressing plate 14 has a groove 15 that mates with the synchronizing ball 16. A driver that mates with the first support shaft 8 is installed on the transport control housing 1. The driver includes a motor base 18 fixedly installed at the bottom of the transport control housing 1. A servo motor 19 is fixedly connected to the motor base 18. The output end of the servo motor 19 is fixedly connected to a first synchronizing wheel 20. A second slide groove 22 is opened on the side of the first support shaft 8 facing the first synchronizing wheel 20. A second prism is slidably arranged in the second slide groove 22. 23. One end of the second prism 23 is connected to the inner wall of the second slide 22 by a second compression spring 24. The other end of the second prism 23 is fixedly connected to a connecting shaft 17. A second synchronous wheel 21 that contacts the first synchronous wheel 20 is fixedly connected to the connecting shaft 17. A movable seat 25 is rotatably sleeved on the outside of the connecting shaft 17. A first guide post 26 passes through the movable seat 25 and is fixedly connected to the motor seat 18. A support post 27 is fixedly connected to the movable seat 25. A control rod 28 passes through the transport control housing 1. A limit plate 29 is fixedly connected to the bottom end of the control rod 28. The bottom of the limit plate 29 has an opening that connects to the support post 27. The control rod 28 is fitted with a limiting groove 30, and the chamber shape of the limiting groove 30 is a frustum-shaped structure. The outer side of the control rod 28 is fitted with a sliding frame 31, and the sliding frame 31 is slidably connected to the nursing box 2. The control rod 28 is fitted with a magnetic suction component that is compatible with the nursing box 2. The magnetic suction component includes a magnetic ring 32 that is fixedly fitted on the outside of the control rod 28. Two iron plates 33 are fixedly connected on the nursing box 2. The control rod 28 passes through the two iron plates 33, and the magnetic ring 32 is located between the two iron plates 33. The top of the control rod 28 is fixedly connected with a turntable 49. A speed reduction plate 51 is provided above the rotating shaft 7. The speed reduction plate 51 and the sliding frame 31 are fixedly connected through a pressing frame 50. The first synchronous wheel 20 is driven to rotate by the servo motor 19. The first synchronous wheel 20 drives the second synchronous wheel 21, connecting shaft 17, second prism 23 and first support shaft 8 to rotate synchronously through friction. The first support shaft 8 drives a corresponding rotating shaft 7 to rotate through the first bevel gear 9 and the second bevel gear 10. The first compression spring 13 is in a compressed state. The first compression spring 13 applies pressure to the first prism 12 and the pressing plate 14 to make the groove 15 and the synchronous ball 16 fit tightly. The rotating shaft 7 drives the pressing plate 14 to rotate synchronously through the synchronous ball 16, so that the two rotating shafts 7 and the two rear wheels 5 rotate synchronously. At this time, the magnetic ring 32 is magnetically attracted to an iron plate 33 located above. When the servo motor 19 fails and an emergency stop is required, the caregiver drives the control lever 28 and the limit lever through the turntable 49. The positioning plate 29 moves down, the magnetic ring 32 separates from the iron plate 33 above, and the top of the support column 27 is inserted into the limiting groove 30. As the limiting plate 29 continues to move down, the inner wall of the limiting groove 30 pushes the support column 27 and the movable seat 25 to slide relative to the first guide column 26 and the motor seat 18. The movable seat 25 drives the second synchronous wheel 21 to no longer contact the first synchronous wheel 20 through the connecting shaft 17. The first synchronous wheel 20 cannot drive the second synchronous wheel 21 to rotate synchronously. When the control lever 28 descends to the lowest position, the magnetic ring 32 is magnetically attracted to the iron plate 33 below, and the control lever 28 drives the deceleration plate 51 to contact the rotating shaft 7 through the sliding frame 31 and the pressing frame 50. The deceleration plate 51 slows down the rotation speed of the rotating shaft 7 and the rear wheel 5, making it easier to stop the movement of the transport control housing 1 and the nursing box 2.

[0024] Example 3, based on Example 2, by Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8The angle control mechanism includes a rotating sleeve 4 fitted around a control rod 28, which is rotatably connected to a transport control housing 1. Several guide strips 34 are fixedly connected to the control rod 28, and several guide grooves 35 that mate with the guide strips 34 are provided on the inner wall of the rotating sleeve 4. A rotating plate 36 is rotatably connected inside the transport control housing 1. A translation frame 37 is provided inside the transport control housing 1. Several first support sleeves 38 are slidably fitted around the outside of the translation frame 37, and the first support sleeves 38 are fixedly connected to the inner wall of the transport control housing 1. First movable columns 40 are fixedly connected to both the rotating sleeve 4 and the translation frame 37. First rectangular holes 39 are provided at both ends of the rotating plate 36, and the two first movable columns 40 are respectively located within the two first rectangular holes 39. A second support shaft 41 is fixedly connected to the top of the front wheel 3. The support shaft 41 and the transport control housing 1 are rotatably connected. A second movable column 42 located inside the transport control housing 1 is fixedly connected to the second support shaft 41. The two ends of the translation frame 37 are respectively provided with second rectangular holes 43, and the second movable column 42 is slidably installed in the corresponding second rectangular holes 43. The transport control housing 1 is provided with a movable plate 44. Several second guide columns 45 pass through the movable plate 44. The second guide columns 45 are fixedly connected to the inner wall of the transport control housing 1. A third compression spring 46 is sleeved on the outside of the second guide column 45. The two ends of the third compression spring 46 are respectively fixedly connected to the movable plate 44 and the inner wall of the transport control housing 1. A positioning block 47 is fixedly connected to the side of the movable plate 44 away from the third compression spring 46. Several positioning grooves 48 that cooperate with the positioning block 47 are provided on the translation frame 37. The caregiver drives the control lever 28 to rotate via the turntable 49. The control lever 28 drives the rotating sleeve 4 to rotate via the guide bar 34. The rotating sleeve 4 drives the first movable column 40 to slide within the first rectangular hole 39, thereby causing the rotating plate 36 to rotate. The rotating plate 36 drives the translation frame 37 to slide relative to the first support sleeve 38 and the transport control housing 1 via another first rectangular hole 39 and the first movable column 40. The translation frame 37 then drives the second movable column 42 to slide within the second rectangular hole 43. The second movable column 42 drives the second support shaft 41 and the front wheel 3 to rotate, thereby changing the transport control. The forward angle of housing 1 and nursing box 2 is adjusted. The third compression spring 46 applies pressure to the movable plate 44 so that the positioning block 47 is inserted into the corresponding positioning groove 48. The positioning block 47 positions the translation frame 37 to prevent the translation frame 37 from sliding relative to the transport control housing 1 due to non-human factors. When the control lever 28 rotates, the translation frame 37 slides relative to the transport control housing 1. The end of the positioning block 47 slides from one corresponding positioning groove 48 to another positioning groove 48. When the caregiver stops the drive turntable 49 from rotating, the front wheel 3 can be fixed when it rotates to the preset angle.

[0025] Example 4, based on Example 2, by Figure 2 , Figure 3 , Figure 10 , Figure 11 , Figure 12 and Figure 13 The height control structure includes a swing frame 52 rotatably sleeved outside the rotating shaft 7, and the swing frame 52 is rotatably connected to the first support shaft 8. An adjustment component adapted to the rotating shaft 7 is installed on the transport control housing 1. The adjustment component includes a support frame 53 rotatably sleeved outside the rotating shaft 7. A slide plate 54 is rotatably connected to the support frame 53. A second support sleeve 55 is slidably sleeved on the outside of the slide plate 54. Two hydraulic telescopic rods 56 are fixedly connected to the transport control housing 1, and the telescopic ends of the two hydraulic telescopic rods 56 are respectively fixedly connected to the corresponding second support sleeves 55. The support unit includes several bases 59 disposed below the transport control housing 1. A threaded post 57 is fixedly connected to the top of the base 59. A threaded sleeve 58 is threadedly sleeved on the outside of the threaded post 57. The top of the threaded sleeve 58 is fixedly connected to the bottom of the transport control housing 1. The second support sleeve 55 is moved vertically by the hydraulic telescopic rod 56, which in turn drives the slide plate 54 to move vertically. The slide plate 54 slides relative to the second support sleeve 55, and the slide plate 54 drives the rotating shaft 7 and the swing frame 52 to rotate relative to the first support shaft 8 via the support frame 53. At this time, one of the rotating shafts 7 drives the pressing plate 14 to rotate relative to the synchronous ball 16 and the other rotating shaft 7, and the other rotating shaft 7 drives the second bevel gear 10 to roll on the first bevel gear 9. The swing frame 52 slides relative to the clearance hole 61 and the support shell 6, and the swing frame 52 blocks the clearance hole 61 to prevent external dust from entering the support shell 6 through the clearance hole 61. When the rotating shaft 7 drives the bottom of the rear wheel 5 to a horizontal position higher than the bottom of the universal wheel 60, the horizontal position of the rear wheel 5 is higher than that of the universal wheel 60. In the horizontal position, the rear wheel 5 no longer supports the transport control housing 1. Instead, the omnidirectional wheel 60 and the front wheel 3 support the transport control housing 1, allowing the transport control housing 1 and the nursing box 2 to turn around quickly. When the bottom horizontal position of the rear wheel 5 driven by the pivot 7 is lower than the bottom horizontal position of the omnidirectional wheel 60, the caregiver drives the base 59 and the threaded post 57 to rotate relative to the threaded sleeve 58, so that the bottom horizontal position of the base 59 is lower than the bottom horizontal position of the omnidirectional wheel 60. When the bottom horizontal position of the rear wheel 5 driven by the pivot 7 is higher than the bottom horizontal position of the base 59, the base 59 can support the transport control housing 1 and the nursing box 2, increasing the contact area between the trolley and the ground and reducing the possibility of the transport control housing 1 and the nursing box 2 swaying relative to the ground.

[0026] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

Claims

1. A nursing electric-assisted trolley, comprising a transport control housing (1) and a nursing box (2) fixedly installed on the top of the transport control housing (1), characterized in that, The transport control housing (1) is provided with two front wheels (3) and two rear wheels (5) below. The transport control housing (1) is equipped with a support unit that cooperates with the rear wheels (5). The rear wheels (5) are fixedly connected with a rotating shaft (7). The transport control housing (1) is provided with a separate drive assembly for driving the two rotating shafts (7) to rotate. The transport control housing (1) is provided with an angle control mechanism for adjusting the angle of the two front wheels (3). The transport control housing (1) is provided with a height control structure that cooperates with the two rotating shafts (7). The bottom of the transport control housing (1) is rotatably connected with casters (60).

2. The nursing electric-assisted handcart according to claim 1, characterized in that, The separate drive assembly includes a support shell (6) fixedly installed at the bottom of the transport control shell (1). The inner walls of both sides of the support shell (6) are respectively provided with clearance holes (61) that cooperate with two rotating shafts (7). A first support shaft (8) is rotatably connected to the support shell (6). A first bevel gear (9) located inside the support shell (6) is fixedly connected to the first support shaft (8). A second bevel gear (10) meshing with the first bevel gear (9) is provided inside the support shell (6), and the second bevel gear (10) is fixedly sleeved on the outside of a corresponding rotating shaft (7). A synchronizing ball (16) is fixedly connected to one of the rotating shafts (7), and a first sliding groove (11) is provided on the other rotating shaft (7). A first prism (12) is slidably provided in the first sliding groove (11). One end of the first prism (12) and the inner wall of the first sliding groove (11) are connected by a first compression spring (13). A pressing plate (14) is fixedly connected to the other end of the first prism (12), and a groove (15) that cooperates with the synchronizing ball (16) is provided on the pressing plate (14). A driver that cooperates with the first support shaft (8) is installed on the transport control housing (1).

3. The nursing electric-assisted handcart according to claim 2, characterized in that, The driver includes a motor mount (18) fixedly installed at the bottom of the transport control housing (1). A servo motor (19) is fixedly connected to the motor mount (18). A first synchronous wheel (20) is fixedly connected to the output end of the servo motor (19). A second slide groove (22) is opened on the side of the first support shaft (8) facing the first synchronous wheel (20). A second prism (23) is slidably arranged in the second slide groove (22). One end of the second prism (23) is connected to the inner wall of the second slide groove (22) by a second compression spring (24). A connecting shaft (17) is fixedly connected to the other end of the second prism (23). A second synchronous wheel (21) that contacts the first synchronous wheel (20) is fixedly connected to the connecting shaft (17).

4. The nursing electric-assisted handcart according to claim 3, characterized in that, The connecting shaft (17) is externally fitted with a movable seat (25), through which a first guide post (26) passes, and the first guide post (26) is fixedly connected to the motor seat (18). A support post (27) is fixedly connected to the movable seat (25). A control rod (28) passes through the transport control housing (1). A limit plate (29) is fixedly connected to the bottom of the control rod (28). A limit groove (30) adapted to the support post (27) is opened at the bottom of the limit plate (29). The cavity shape of the limit groove (30) is a frustum structure. A sliding frame (31) is externally fitted to the control rod (28), and the sliding frame (31) is slidably connected to the nursing box (2). A magnetic suction component adapted to the nursing box (2) is installed on the control rod (28).

5. The nursing electric-assisted handcart according to claim 4, characterized in that, The magnetic component includes a magnet ring (32) fixedly sleeved on the outside of the control rod (28). Two iron plates (33) are fixedly connected to the nursing box (2). The control rod (28) passes through the two iron plates (33), and the magnet ring (32) is located between the two iron plates (33).

6. The nursing electric-assisted handcart according to claim 4, characterized in that, The top of the control lever (28) is fixedly connected to a turntable (49), and a speed reduction plate (51) is provided above the rotating shaft (7). The speed reduction plate (51) and the sliding frame (31) are fixedly connected by a pressing frame (50).

7. The nursing electric-assisted handcart according to claim 4, characterized in that, The angle control mechanism includes a rotating sleeve (4) sleeved on the outside of the control rod (28), and the rotating sleeve (4) is rotatably connected to the transport control housing (1). Several guide strips (34) are fixedly connected to the control rod (28), and several guide grooves (35) that cooperate with the guide strips (34) are opened on the inner wall of the rotating sleeve (4). A rotating plate (36) is rotatably connected inside the transport control housing (1). A translation frame (37) is provided inside the transport control housing (1). Several first support sleeves (38) are slidably sleeved on the outside of the translation frame (37), and the first support sleeves (38) are fixedly connected to the inner wall of the transport control housing (1). The rotating sleeve (4) and the translation frame (37) are rotatably connected to the control rod (28). Each of the shift frame (37) is fixedly connected with a first movable column (40). Both ends of the rotating plate (36) are provided with a first rectangular hole (39), and the two first movable columns (40) are respectively located in the two first rectangular holes (39). The top of the front wheel (3) is fixedly connected with a second support shaft (41). The second support shaft (41) is rotatably connected to the transport control housing (1). The second support shaft (41) is fixedly connected with a second movable column (42) located in the transport control housing (1). Both ends of the shift frame (37) are provided with a second rectangular hole (43), and the second movable column (42) is slidably installed in the corresponding second rectangular hole (43).

8. The nursing electric-assisted handcart according to claim 7, characterized in that, The transport control housing (1) is provided with a movable plate (44), and a number of second guide posts (45) are passed through the movable plate (44). The second guide posts (45) are fixedly connected to the inner wall of the transport control housing (1). A third compression spring (46) is sleeved on the outside of the second guide posts (45). The two ends of the third compression spring (46) are fixedly connected to the movable plate (44) and the inner wall of the transport control housing (1) respectively. A positioning block (47) is fixedly connected on the side of the movable plate (44) away from the third compression spring (46). A number of positioning grooves (48) that cooperate with the positioning block (47) are opened on the translation frame (37).

9. The nursing electric-assisted handcart according to claim 2, characterized in that, The height control structure includes a swing frame (52) rotatably sleeved outside the rotating shaft (7), and the swing frame (52) and the first support shaft (8) are rotatably connected. An adjustment component adapted to the rotating shaft (7) is installed on the transport control housing (1).

10. The nursing electric-assisted trolley according to claim 9, characterized in that, The adjusting component includes a support frame (53) rotatably sleeved outside the rotating shaft (7), a slide plate (54) rotatably connected to the support frame (53), a second support sleeve (55) slidably sleeved outside the slide plate (54), and two hydraulic telescopic rods (56) fixedly connected to the transport control housing (1), and the telescopic ends of the two hydraulic telescopic rods (56) are respectively fixedly connected to the corresponding second support sleeves (55).

11. The nursing electric-assisted trolley according to claim 1, characterized in that, The support unit includes several bases (59) disposed below the transport control housing (1). A threaded column (57) is fixedly connected to the top of the base (59). A threaded sleeve (58) is provided on the outer thread of the threaded column (57). The top of the threaded sleeve (58) is fixedly connected to the bottom of the transport control housing (1).

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