A wheelchair bed with a smart toilet
By designing a collection bag clamping component, a toilet heating and drying component, and an adjustment component on the wheelchair bed, the problems of odor diffusion and bacterial growth in the wheelchair bed are solved, achieving a hygienic and comfortable user experience, extending the life of the equipment, and enhancing the user's self-care ability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI HENRY YIJIAN DECORATION CO LTD
- Filing Date
- 2025-07-08
- Publication Date
- 2026-06-30
AI Technical Summary
In existing technology, wheelchair beds equipped with smart toilets will quickly breed bacteria and release irritating gases if excrement is not emptied in time after use, causing odor to spread and affecting the user's health.
A wheelchair bed with a smart toilet was designed, comprising a collection bag clamping assembly and an elastic assembly. The clamping blocks are driven by a cylinder to move closer together, and the springs provide clamping force to prevent excrement from contacting the outside. It is equipped with a toilet heating and drying assembly, and the toilet lid is closed in time to form a sealed space to block odors. The back and leg adjustment assembly is driven by a motor to adjust the angle and provide comfortable support. The lifting assembly suspends the rollers to avoid tire wear.
It effectively prevents the escape of irritating gases, maintains hygiene and cleanliness, reduces bacterial growth, improves user comfort, extends the life of the wheelchair bed, reduces the burden on caregivers, and enhances the user's self-care ability.
Smart Images

Figure CN224421330U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wheelchair bed equipment technology, specifically a wheelchair bed with an intelligent toilet. Background Technology
[0002] The core purpose of equipping wheelchair beds with smart toilets is to provide a seamless experience for people with limited mobility, such as the elderly, disabled, and those recovering from surgery, by integrating mobility and toileting. Users can use the toilet directly on the wheelchair bed, avoiding the need to move from the wheelchair bed to the toilet. It also features hygienic cleaning functions such as heating, washing, and drying.
[0003] In existing technologies, wheelchair beds equipped with smart toilets typically use garbage bags attached to the bottom of the toilet to collect waste. While this greatly improves the convenience for people with mobility impairments, if waste is not emptied promptly after use, it not only rapidly breeds bacteria but also causes a strong odor to spread. Over time, the proteins and carbohydrates in the feces are rapidly decomposed by anaerobic bacteria in the sealed container, releasing irritating gases such as hydrogen sulfide, ammonia, and methanethiol. These gases not only have an unpleasant putrid or urine-like odor but also seep out through weak points such as the sealing seams of the waste tank and the drain valve, spreading along the gaps in the wheelchair bed frame and seat into the surrounding space. This not only accelerates bacterial growth but also poses a threat to the user's skin health, making it unbearable for the user. Therefore, we propose a wheelchair bed with a smart toilet. Utility Model Content
[0004] The purpose of this invention is to provide a wheelchair bed with an intelligent toilet to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a wheelchair bed with an intelligent toilet, comprising a wheelchair bed body, a seat cushion, a backrest cushion, a leg support cushion, a toilet heating assembly, a toilet spray assembly, a toilet drying assembly, a water tank, a motion controller, and a waste collection box; a first armrest is installed on the right side of the wheelchair bed body, a second armrest is installed on the left side of the wheelchair bed body, a power supply is fixedly connected inside the wheelchair bed body, and a flush controller is installed on the top of the wheelchair bed body; it also includes:
[0006] Backrest adjustment component, which is located on the front exterior of the wheelchair bed body, allows adjustment of the backrest angle;
[0007] The opening and closing assembly is located on the top of the wheelchair bed body and is used to open and close the toilet heating assembly;
[0008] The leg adjustment component is located on the rear exterior of the wheelchair bed body, and the angle of the leg support pad can be adjusted through the leg adjustment component;
[0009] The collection bag clamping component and the elastic component are arranged outside the excrement collection frame. The collection bag clamping component is located outside the collection bag clamping component. The collection bag clamping component and the elastic component work together to clamp the collection bag inside the excrement collection frame.
[0010] The wheelchair bed has a support assembly inside the rear side, which includes a mounting base. The bottom of the mounting base is fitted with medical casters via mounting bolts. The wheelchair bed has a drive assembly inside the front side, which includes a drive motor. The output end of the drive motor is fixedly connected to a transmission shaft. Rollers are mounted on the outside of the transmission shaft.
[0011] The back adjustment assembly includes an angle adjuster, a fixing plate is mounted on the outside of the angle adjuster, a rotating motor is fixedly connected to the outside of the fixing plate, and a connecting rod is provided at the output end of the rotating motor.
[0012] The opening and closing assembly includes a connecting piece, two damping pivots are provided on the outside of the connecting piece, a connecting rod is fixedly connected to the rear side of the opening and closing assembly, and a toilet seat is fixedly connected to the outside of the connecting rod.
[0013] The leg adjustment assembly includes an angle adjuster, a rotating motor, and a fixing plate, with a rotating shaft inside the angle adjuster.
[0014] The collection bag clamping assembly includes a cylinder, with a pull rod fixedly connected to the cylinder output end. Two limit grooves are opened on the outside of the pull rod, and a connecting column is rotatably connected inside the limit groove. Two limit rods are fixedly connected to the bottom of the excretion collection frame, and a sliding groove is opened inside the connecting column. One of the connecting columns is fixedly connected to a locking block one, and the other connecting column is fixedly connected to a locking block two.
[0015] The elastic component includes a telescopic rod one, a telescopic rod two is slidably connected inside the telescopic rod one, limit plates are fixedly connected to the outside of both the telescopic rod one and the telescopic rod two, and a spring is sleeved on the outside of the telescopic rod one.
[0016] The wheelchair bed has a lifting assembly on its exterior. A lead screw motor is fixedly connected to the top of the lifting assembly, and a transmission lead screw is fixedly connected to the output end of the lead screw motor. Two limit posts are slidably connected inside the lifting assembly. Fixed seats are fixedly connected to the bottom of the two limit posts, and support wheels are installed at the bottom of the fixed seats.
[0017] This utility model has at least the following beneficial effects:
[0018] In use, the collection bag clamping assembly uses a cylinder to drive two clamping blocks to move closer together, and the spring in the elastic component provides continuous clamping force, firmly fixing the garbage bag in the excrement collection frame. This prevents excrement from contacting the outside air and avoids the escape of irritating gases such as hydrogen sulfide and ammonia. The opening and closing assembly controls the opening and closing of the toilet lid via a damping pivot, allowing it to maintain any angle. After use, it can be closed promptly to create a sealed space, further preventing the spread of odors. After urination or defecation, the flushing and drying functions can be used for hygiene cleaning. After use, the garbage bag containing wastewater and excrement can be removed and replaced with a new one. The toilet drying assembly blows hot air to keep the inside of the toilet dry, destroying the damp environment that breeds bacteria. The heating function improves user comfort, while the high-temperature drying helps to inhibit bacteria and reduce odor sources.
[0019] The backrest and leg support cushions can be adjusted by a swivel motor-driven angle adjuster to suit the user's lying needs and avoid muscle fatigue and pressure sores caused by prolonged fixed posture. The motion controller integrates angle adjustment function, which can be controlled by the user to improve independent living ability. The screw motor of the lifting component drives the support wheels to descend, so that the drive rollers are suspended in the air, avoiding tire deformation due to weight when the wheelchair is stationary for a long time. It also reduces wear and tear on the wheels from ground debris, extends the service life of the wheelchair bed, and the support wheels can provide additional stable support when stationary.
[0020] This reduces the burden on caregivers so they don't have to accompany their children to the bathroom at night, allowing most users to use the device independently and eliminating the need for them to travel to the bathroom at night. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the structure of this utility model;
[0022] Figure 2 This is a schematic diagram of the opening and closing component structure of this utility model;
[0023] Figure 3 This is a schematic diagram of the lifting component structure of this utility model;
[0024] Figure 4 This is a schematic diagram of the leg adjustment component of this utility model;
[0025] Figure 5 This is a schematic diagram of the structure of the collection bag clamping assembly of this utility model;
[0026] Figure 6 This is a schematic diagram of the elastic component structure of this utility model;
[0027] Figure 7 This is a schematic diagram of the leg support pad structure of this utility model;
[0028] In the diagram: 1. Wheelchair bed body; 101. Armrest 1; 102. Armrest 2; 103. Power supply; 2. Seat cushion; 3. Backrest cushion; 4. Leg support cushion; 5. Support assembly; 501. Mounting base; 502. Mounting bolt; 503. Medical casters; 6. Drive assembly; 601. Drive motor; 602. Drive shaft; 603. Roller; 7. Backrest adjustment assembly; 701. Angle adjuster 1; 702. Fixing plate 1; 703. Angle motor 1; 704. Connecting rod 1; 8. Opening and closing assembly; 801. Connecting piece; 802. Damping pivot; 803. Connecting rod 2; 804. Toilet seat; 9. Leg adjustment assembly; 901. Angle adjuster 2; 902. Rotating shaft; 903. Angle motor 2; 904. Fixing plate 2 10. Toilet heating assembly; 11. Water tank; 1101. Toilet spray assembly; 1102. Toilet dryer assembly; 1103. Flushing controller; 12. Motion controller; 13. Excrement collection box; 14. Collection bag clamping assembly; 1401. Cylinder; 1402. Pull rod; 1403. Limiting groove; 1404. Connecting column; 1405. Limiting rod; 1406. Slide groove; 1407. Locking block one; 1408. Locking block two; 15. Elastic assembly; 1501. Telescopic rod one; 1502. Telescopic rod two; 1503. Limiting plate; 1504. Spring; 16. Lifting assembly; 1601. Screw motor; 1602. Transmission screw; 1603. Limiting column; 1604. Fixing base; 1605. Support wheel. Detailed Implementation
[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0030] Example 1
[0031] Please see Figures 1 to 7 This utility model provides a technical solution: a wheelchair bed with an intelligent toilet, including a wheelchair bed body 1, a seat cushion 2, a backrest cushion 3, a leg support cushion 4, a toilet heating component 10, a toilet spray component 1101, a toilet drying component 1102, a water tank 11, a motion controller 12, and a waste collection box 13. A first armrest 101 is installed on the right side of the wheelchair bed body 1, a second armrest 102 is installed on the left side of the wheelchair bed body 1, a power supply 103 is fixedly connected inside the wheelchair bed body 1, and a flush controller 1103 is installed on the top of the wheelchair bed body 1; it also includes:
[0032] Backrest adjustment component 7 is located on the front side of the outer side of the wheelchair bed body 1. The angle of the backrest cushion 3 is adjusted by the backrest adjustment component 7.
[0033] The opening and closing component 8 is located on the top of the wheelchair bed body 1 and is used for opening and closing the toilet heating component 10.
[0034] Leg adjustment component 9 is located on the rear side of the outer side of the wheelchair bed body 1. The angle of the leg support pad 4 can be adjusted by the leg adjustment component 9.
[0035] The collection bag clamping assembly 14 and the elastic assembly 15 are arranged outside the excretion collection frame 13. The collection bag clamping assembly 14 is located outside the excretion collection frame 13, and the elastic assembly 15 is located outside the collection bag clamping assembly 14. The collection bag clamping assembly 14 and the elastic assembly 15 are used to clamp the collection bag inside the excretion collection frame 13. The wheelchair bed body 1 is the core. The armrest 1 101 and armrest 2 102 ensure the safety of the user. The power supply 103 supplies power to each component. The medical universal wheels 503 of the support assembly 5 are installed at the bottom of the mounting base 501 through the mounting bolts 502 to facilitate the turning of the wheelchair bed.
[0036] A support assembly 5 is provided on the rear side of the interior of the wheelchair bed body 1. The support assembly 5 includes a mounting base 501, and a medical caster wheel 503 is mounted on the bottom of the mounting base 501 via a mounting bolt 502. A drive assembly 6 is provided on the front side of the interior of the wheelchair bed body 1. The drive assembly 6 includes a drive motor 601, and a transmission shaft 602 is fixedly connected to the output end of the drive motor 601. Rollers 603 are mounted on the outside of the transmission shaft 602. After the drive motor 601 of the drive assembly 6 is started, it drives the transmission shaft 602 to rotate, driving the rollers 603, thereby realizing the forward, backward and turning movements of the wheelchair bed.
[0037] The backrest adjustment assembly 7 includes an angle adjuster 701, a fixing plate 702 is mounted on the outside of the angle adjuster 701, a corner motor 703 is fixedly connected to the outside of the fixing plate 702, and a connecting rod 704 is provided at the output end of the corner motor 703. When adjusting the angle of the backrest cushion 3, the corner motor 703 is started by the motion controller 12, which drives the connecting rod 704 to rotate. The angle adjuster 701 adjusts the fixing plate 702, thereby changing the tilt angle of the backrest cushion 3.
[0038] The opening and closing assembly 8 includes a connecting piece 801. Two damping shafts 802 are provided on the outside of the connecting piece 801. A connecting rod 803 is fixedly connected to the rear side of the opening and closing assembly 8. A toilet seat 804 is fixedly connected to the outside of the connecting rod 803. The two damping shafts 802 are provided on the outside of the connecting piece 801 and are connected to the wheelchair bed body 1 through the damping shafts 802. Rotating the connecting piece 801 can drive the connecting rod 803 and the toilet seat 804 to open or close.
[0039] The leg adjustment assembly 9 includes an angle adjuster 2 901, a rotating motor 2 903, and a fixing plate 2 904. The angle adjuster 2 901 has a rotating shaft 902 inside. When adjusting the angle of the leg support pad 4, the rotating motor 2 903 is started, and the rotating shaft 902 drives the angle adjuster 2 901 to adjust the fixing plate 2 904 to change the angle.
[0040] The collection bag clamping assembly 14 includes a cylinder 1401. A pull rod 1402 is fixedly connected to the output end of the cylinder 1401. Two limiting grooves 1403 are opened on the outside of the pull rod 1402. A connecting post 1404 is rotatably connected inside the limiting groove 1403. Two limiting rods 1405 are fixedly connected to the bottom of the excretion collection frame 13. A sliding groove 1406 is opened inside the connecting post 1404. A locking block 1407 is fixedly connected to the outside of one of the connecting posts 1404, and a locking block 2 1408 is fixedly connected to the outside of the other connecting post 1404. When using the excretion collection function, the garbage bag is placed into the excretion collection frame 13, and the cylinder 1401 is activated to push the pull rod 1402, which drives the connecting post 1404 to bring the locking block 1407 and the locking block 2 1408 closer together.
[0041] The elastic component 15 includes a telescopic rod 1501, a telescopic rod 2 1502 slidably connected inside the telescopic rod 1501, and limit plates 1503 fixedly connected to the outside of both the telescopic rod 1501 and the telescopic rod 2 1502. A spring 1504 is sleeved on the outside of the telescopic rod 1501. The spring 1504 of the elastic component 15 provides elastic force to clamp the garbage bag and prevent odor from being emitted.
[0042] The wheelchair bed body 1 is externally equipped with a lifting assembly 16. A lead screw motor 1601 is fixedly connected to the top of the lifting assembly 16, and a transmission lead screw 1602 is fixedly connected to the output end of the lead screw motor 1601. Two limiting posts 1603 are slidably connected inside the lifting assembly 16. A fixed seat 1604 is fixedly connected to the bottom of the two limiting posts 1603. A support wheel 1605 is installed at the bottom of the fixed seat 1604. When the wheelchair bed is not in use, the lead screw motor 1601 is started to drive the transmission lead screw 1602 to rotate, causing the limiting posts 1603 to slide, which in turn causes the fixed seat 1604 and the support wheel 1605 to descend, lifting the drive motor 601 and the roller 603 in the drive assembly 6 and suspending them in the air to avoid damage from the weight.
[0043] The working principle of this utility model is as follows: the main body 1 of the wheelchair bed serves as the core load-bearing structure, the right armrest 101 and the left armrest 2 102 provide gripping support for the user and ensure riding safety, the internal fixed power supply 103 supplies power to each component of the wheelchair bed, the medical universal wheels 503 in the support component 5 are installed at the bottom of the mounting base 501 by mounting bolts 502 to facilitate the turning of the wheelchair bed; after the drive motor 601 in the drive component 6 is started, it drives the transmission shaft 602 to rotate, thereby driving the rollers 603 to realize the forward, backward and turning functions of the wheelchair bed;
[0044] After urinating or defecating, the user presses the flush controller 1103 on the top of the wheelchair bed body 1, which activates the toilet spray component 1101 in the water tank 11, delivering water to the toilet heating component 10 for flushing. After flushing, the toilet drying component 1102 inside the toilet heating component 10 is activated, blowing out hot air to dry the inside of the toilet. At the same time, the toilet heating component 10 has a heating function, powered by the power supply 103, and can adjust the temperature according to the user's needs, providing the user with a comfortable experience. It can also reduce the burden on caregivers, so that they do not need to accompany the user to the bathroom at night. This allows most users to use the toilet independently, and users do not need to go to the bathroom at night.
[0045] When the excrement collection function is needed, place the garbage bag in the excrement collection frame 13 and activate the cylinder 1401 of the collection bag clamping assembly 14. The output end of the cylinder 1401 pushes the pull rod 1402 to move. The limiting groove 1403 on the pull rod 1402 is rotatably connected to the connecting column 1404. As the pull rod 1402 moves, the connecting column 1404 slides along the slide groove 1406 under the guidance of the limiting rod 1405, causing the first clamping block 1407 and the second clamping block 1408 to move closer to each other. At this time, the spring 1504 in the elastic assembly 15 is sleeved outside the first telescopic rod 1501, and the second telescopic rod 1502 slides inside the first telescopic rod 1501. The limiting piece 1503 restricts its sliding range, and the spring 1504 provides elastic clamping force for the first clamping block 1407 and the second clamping block 1408, so that the two clamp the garbage bag tightly and effectively prevent odor from being discharged.
[0046] When the backrest cushion 3 needs to be adjusted, the first angle motor 703 is started. Its output end drives the first connecting rod 704 to rotate. The angle of the first fixing plate 702 is adjusted by the first angle adjuster 701, thereby changing the tilt angle of the backrest cushion 3. The first angle motor 703 can be controlled by the operation controller 12 to adjust the backrest cushion 3 to a suitable tilt angle to provide comfortable back support. To adjust the angle of the leg support pad 4, the second angle motor 903 is started. Its rotating shaft 902 drives the second angle adjuster 901 to work, thereby adjusting the angle of the second fixing plate 904 and changing the angle of the leg support pad 4.
[0047] The lead screw motor 1601 drives the transmission lead screw 1602 to rotate, causing the limit post 1603 to slide inside the lifting assembly 16, which in turn drives the fixed seat 1604 and the support wheel 1605 to descend. Thus, when the wheelchair bed body 1 is not in use, the drive motor 601 and the roller 603 in the drive assembly 6 are in a suspended state and do not bear weight.
[0048] When transforming the wheelchair bed body 1 into a bed, firstly, the first angle motor 703 is activated, causing the first angle motor 703 to drive the first connecting rod 704 to rotate. Then, the first connecting rod 704, in conjunction with the first angle adjuster 701, rotates outside the back adjustment assembly 7, so that the first fixing plate 702 and the backrest cushion 3 are in a parallel state with the seat cushion 2, and the first angle adjuster 701 effectively bears the weight. Then, when adjusting the position of the leg support pad 4, firstly, the second angle motor 903 is activated, causing the second angle motor 903 to drive the rotating shaft 902 to rotate the second fixing plate 904. Then, the second fixing plate 904, in conjunction with the leg support pad 4, is in a parallel state with the seat cushion 2, and the second angle adjuster 901 effectively bears the weight, so that the backrest cushion 3 is in a horizontal state with the seat cushion 2 and the leg support pad 4. Then, the wheelchair bed body 1 transforms into a bed, allowing the user to lie flat.
[0049] Example 2
[0050] Please see Figure 2 and Figure 4 In this second embodiment, the other structures remain unchanged. The difference from the first embodiment is that the opening and closing component 8 is used to control the opening and closing of the toilet heating component 10. The connecting piece 801 is connected to the wheelchair bed body 1 through the damping shaft 802. Rotating the connecting piece 801 drives the connecting rod 803 and the toilet seat 804 to open or close. The operation is convenient and the damping shaft 802 can keep the toilet seat 804 at any opening and closing angle.
[0051] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0052] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A wheelchair bed with an intelligent toilet, characterized in that: The wheelchair bed includes the main body, seat cushion, backrest cushion, leg support cushion, toilet heating assembly, toilet spray assembly, toilet drying assembly, water tank, motion controller, and waste collection box. The wheelchair bed body is equipped with a first armrest on the right side and a second armrest on the left side. A power supply is fixedly connected inside the wheelchair bed body, and a flushing controller is installed on the top of the wheelchair bed body. A backrest adjustment assembly is located on the front exterior of the wheelchair bed body, and the angle of the backrest cushion is adjusted by the backrest adjustment assembly. An opening and closing assembly is installed on the top of the wheelchair bed body and is used for opening and closing the toilet heating assembly; A leg adjustment assembly is located on the rear exterior of the wheelchair bed body, and the angle of the leg support pad can be adjusted by the leg adjustment assembly. The collection bag clamping assembly and the elastic assembly are provided. The collection bag clamping assembly is located outside the excrement collection frame, and the elastic assembly is located outside the collection bag clamping assembly. The collection bag clamping assembly and the elastic assembly work together to clamp the collection bag inside the excrement collection frame.
2. The wheelchair bed with an intelligent toilet according to claim 1, characterized in that: A support assembly is provided inside the rear side of the wheelchair bed body. The support assembly includes a mounting base, and medical casters are mounted on the bottom of the mounting base via mounting bolts. A drive assembly is provided inside the front side of the wheelchair bed body. The drive assembly includes a drive motor, and a transmission shaft is fixedly connected to the output end of the drive motor. Rollers are mounted on the outside of the transmission shaft.
3. A wheelchair bed with an intelligent toilet according to claim 1, characterized in that: The back adjustment assembly includes an angle adjuster, a fixing plate is mounted on the outside of the angle adjuster, a rotating motor is fixedly connected to the outside of the fixing plate, and a connecting rod is provided at the output end of the rotating motor.
4. A wheelchair bed with an intelligent toilet according to claim 1, characterized in that: The opening and closing assembly includes a connecting piece, two damping pivots are provided on the outside of the connecting piece, a second connecting rod is fixedly connected to the rear side of the opening and closing assembly, and a toilet seat is fixedly connected to the outside of the second connecting rod.
5. A wheelchair bed with an intelligent toilet according to claim 1, characterized in that: The leg adjustment assembly includes an angle adjuster II, a corner motor II, and a fixing plate II, and the angle adjuster II has a rotating shaft inside.
6. A wheelchair bed with an intelligent toilet according to claim 1, characterized in that: The collection bag clamping assembly includes a cylinder, a pull rod is fixedly connected to the output end of the cylinder, two limiting grooves are opened on the outside of the pull rod, a connecting column is rotatably connected inside the limiting groove, two limiting rods are fixedly connected to the bottom of the excretion collection frame, a sliding groove is opened inside the connecting column, a locking block one is fixedly connected to the outside of one of the connecting columns, and a locking block two is fixedly connected to the outside of the other connecting column.
7. A wheelchair bed with an intelligent toilet according to claim 1, characterized in that: The elastic component includes a telescopic rod one, a telescopic rod two is slidably connected inside the telescopic rod one, and limit plates are fixedly connected to the outside of both the telescopic rod one and the telescopic rod two, and a spring is sleeved on the outside of the telescopic rod one.
8. A wheelchair bed with an intelligent toilet according to claim 1, characterized in that: The wheelchair bed body is equipped with a lifting assembly on its exterior. A lead screw motor is fixedly connected to the top of the lifting assembly, and a transmission lead screw is fixedly connected to the output end of the lead screw motor. Two limiting posts are slidably connected inside the lifting assembly. A fixed seat is fixedly connected to the bottom of the two limiting posts, and a support wheel is installed at the bottom of the fixed seat.