Trolley with lifting structure

Abstract

The invention provides a trolley with a lifting structure, and relates to the technical field of medical instrument auxiliary equipment. Two groups of supports are mounted at the lower end of the carriage through bolts, first wheels are mounted on the two groups of supports, two groups of bases are mounted at the lower end of the carriage through bolts, second wheels are mounted on the two groups of bases, two groups of third wheels are mounted at the front end of the carriage through bolts, and the second wheels and the third wheels are universal wheels; the trolley is diverse in moving mode, the track can be accurately controlled by lifting the push rod and only using the first wheel, and the trolley is suitable for narrow space; the first wheel is matched with the second wheel or the third wheel, and by means of the universal characteristic of the first wheel and the third wheel, schemes can be provided for users under the conditions of frequent steering in open sites or complex environments, adaptability is enhanced, and the use range is expanded. The internal space layout of the compartment can be flexibly adjusted according to the size and number of loaded articles; the first motor is operated to drive the movable supporting plate to automatically slide out of the carriage, loading and unloading labor intensity is reduced, and efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical device auxiliary equipment, and particularly relates to a trolley with a lifting structure. Background Art

[0002] In the professional field of medical device cleaning and disinfection, the transportation link of medical devices is not only crucial but also has extremely high requirements for safety and hygiene. The types of medical devices are extremely rich, ranging from small instruments such as scalpels, forceps, and syringes that are frequently used daily, to large-scale CT machines, magnetic resonance imaging devices, and ultrasonic diagnostic instruments, and then to various precision electronic endoscopes, surgical microscopes, etc., covering almost all aspects of medical work. During clinical use, these devices will inevitably come into close contact with patients' body tissues, body fluids, blood, etc. After use, they will be attached with a large amount of complex pollutants and need to be transported to the disinfection room for cleaning and disinfection. Therefore, a trolley with a lifting structure is required.

[0003] Existing trolleys lack flexible moving methods, and the spatial layout of the existing trolley compartments is fixed and lacks an adjustable mechanism. It is impossible to flexibly adjust the internal space according to the size, quantity, and shape differences of the loaded medical devices. Summary of the Invention

[0004] Embodiments of the present disclosure relate to a trolley with a lifting structure to solve the technical problems mentioned in the above background art.

[0005] In the first aspect of the present disclosure, a trolley with a lifting structure is provided, specifically including: a carriage;

[0006] A box door is installed on the carriage through a hinge. Two groups of supports are installed at the lower end of the carriage through bolts. One-wheel is installed on each of the two groups of supports. Two groups of bases are installed at the lower end of the carriage through bolts. Two-wheels are installed on each of the two groups of bases. Two groups of three-wheels are installed at the front end of the carriage through bolts. The two-wheels and the three-wheels are all universal wheels. Two groups of rail plates are installed at the rear end of the carriage through bolts. Sliding seats slide on each of the two groups of rail plates. Rotatable clamping plates are installed on each of the two groups of sliding seats. Handles are welded on each of the two groups of clamping plates. Two groups of slot plates are installed at the rear end of the carriage through bolts. Three slots are provided on the slot plates. Fixed columns are fixed on each of the two groups of sliding seats. Tooth groove structures are provided at the rear ends of the two groups of fixed columns.

[0007] Furthermore, a push rod is installed on the two groups of fixed columns. Tooth-shaped seats are fixed at the left and right ends of the push rod. Tooth-shaped structures are provided on each of the two groups of tooth-shaped seats. The two groups of tooth-shaped seats are respectively engaged with the tooth groove structures on the two groups of fixed columns. The tooth-shaped seats and the fixed columns are connected by screws. Springs are sleeved on the screws. The springs are located between the tooth-shaped seats and the fixed columns.

[0008] Further, two connecting seats are installed at the lower end of the carriage through bolts, and brakes are installed at the lower ends of the two connecting seats. The two brakes are respectively located behind the two first wheels.

[0009] Further, a movable pallet is arranged inside the carriage. Wall plates are arranged at the front and rear ends of the movable pallet. The two wall plates are respectively installed on the inner walls on the left and right sides of the carriage through bolts. Rail rods are installed on the two wall plates through bolts. Connecting plates slide on the two rail rods. And motor seats and belt pulleys are installed on the two rail rods through bolts. A first motor is installed on the motor seat through bolts. A belt pulley is fixed on the output shaft of the first motor. A transmission belt is connected between the belt pulley on the output shaft of the first motor and the belt pulley on the rail rod.

[0010] Further, a fixing seat is installed on the connecting plate through bolts. The fixing seat is of an L-shaped structure and is fixedly connected with the transmission belt. And a waist-shaped through groove is arranged on the fixing seat. The fixing seat is connected with the connecting plate through bolts. Two rail seats are installed on the two wall plates.

[0011] Further, two movable seats slide on the two rail seats respectively. The movable pallet is fixed on the four movable seats. And the two movable seats close to the upper side of the movable pallet are respectively connected with the two connecting plates through bolts.

[0012] Further, a partition plate is installed inside the carriage. Two guide rods are fixed inside the carriage. The partition plate slides on the two guide rods. And bearing seats and matching seats are installed on the inner walls at the front and rear sides of the carriage through bolts.

[0013] Further, second motors are installed on the two matching seats through bolts. A lead screw is installed between the bearing seat and the matching seat. The output shaft of the second motor is connected with the lead screw. U-shaped frame plates are fixed at the left and right ends of the partition plate.

[0014] Further, square seats are installed on the two U-shaped frame plates through bolts. Threaded cylinders are installed on the square seats through bolts. The two threaded cylinders are respectively in threaded cooperation with the two lead screws. And a connecting rod is installed between the matching seat and the bearing seat. Two rollers are installed on the square seat. The connecting rod is located between the two rollers. The two rollers on the square seat are both in contact with the connecting rod.

[0015] Further, a control box is installed at the lower end of the carriage through bolts. A power supply module and a wireless control module are arranged inside the control box. A lithium battery pack is used as the power supply, which has overcharge, over-discharge and short-circuit protection functions. A liquid crystal display screen is arranged outside the control box.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] In the present invention, by lifting the push rod and using only the first wheel for movement, this method is applicable to operations that require precise control of the travel trajectory or in narrow spaces with extremely high requirements for the turning radius. It can achieve fine control by virtue of the stable rolling of the first wheel. In addition, it is also possible to flexibly select the combination of the first wheel and the second wheel. Utilizing the universal characteristics of the second wheel, while ensuring a certain load-bearing stability, it improves the steering flexibility and is suitable for transporting goods in relatively open areas where the direction needs to be frequently changed. When the first wheel and the third wheel are used in combination, the advantages of the universal steering of the third wheel can also be exerted, providing users with diverse mobile solutions according to different operating scenarios, greatly enhancing the adaptability of the trolley in complex environments, effectively expanding its scope of use, and better meeting various actual handling needs compared to trolleys with only one or fixed combinations of mobile methods.

[0018] In addition, in the present invention, a movable partition is provided inside the carriage. By driving the lead screw with the second motor, the partition can slide smoothly on the guide rod. Users can flexibly adjust the internal space layout of the carriage according to the size and quantity of the loaded items, improving the utilization rate of the carriage space and meeting different transportation requirements.

[0019] In addition, in the present invention, by driving the pulley and the transmission belt with the first motor, the connecting plate slides smoothly on the rail rod, and then drives the movable pallet fixed on the movable seat to slide out of the carriage. When loading and unloading goods, there is no need for manual labor to carry the goods in and out of the carriage. Just start the first motor, and the movable pallet can automatically slide out, facilitating users to place the goods on the pallet or take them away from the pallet. This not only reduces the labor intensity but also significantly improves the efficiency of loading and unloading goods. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below.

[0021] The following drawings in the description only relate to some embodiments of the present invention and do not limit the present invention.

[0022] In the drawings:

[0023] Figure 1 shows a schematic diagram of the overall structure of a trolley with a lifting structure according to the present application;

[0024] Figure 2 shows a schematic diagram of the structure at the lower end of the overall of a trolley with a lifting structure according to the present application;

[0025] Figure 3 shows a Figure 2 magnified schematic diagram of part A in a trolley with a lifting structure according to the present application;

[0026] Figure 4 The structural schematic diagram of the moving pallet part of a trolley with a lifting structure according to the present application is shown;

[0027] Figure 5 A trolley with a lifting structure according to the present application is shown Figure 4 The enlarged structural schematic diagram of part B therein;

[0028] Figure 6 The structural schematic diagram of the partition board part of a trolley with a lifting structure according to the present application is shown;

[0029] Figure 7 A trolley with a lifting structure according to the present application is shown Figure 6 The enlarged structural schematic diagram of part C therein;

[0030] Figure 8 The structural schematic diagram of the rear end of the carriage of a trolley with a lifting structure according to the present application is shown;

[0031] Figure 9 The structural schematic diagram of the push rod part of a trolley with a lifting structure according to the present application is shown;

[0032] Figure 10 The structural schematic diagram of the fixed column part of a trolley with a lifting structure according to the present application is shown.

[0033] List of reference numerals

[0034] 1. Carriage; 11. Support; 111. First wheel; 12. Base; 121. Second wheel; 13. Third wheel; 14. Box door; 15. Connection seat; 151. Brake;

[0035] 2. Moving pallet; 21. Wall plate; 22. Rail rod; 221. Connecting plate; 222. Motor seat; 223. First motor; 224. Transmission belt; 225. Fixed seat; 23. Rail seat; 231. Moving seat; 24. Partition board; 241. Guide rod; 242. Bearing seat; 243. Fitting seat; 2431. Second motor; 244. Lead screw; 245. Square seat; 2451. Threaded cylinder; 2452. Roller; 246. U-shaped frame plate; 247. Connecting rod;

[0036] 3. Rail plate; 31. Sliding seat; 311. Clamping plate; 312. Handle; 32. Groove plate; 33. Fixed column; 331. Push rod; 332. Toothed seat; 333. Spring;

[0037] 4. Control box. Detailed implementation manners

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0039] Embodiment 1: Please refer to Figures 1 to 10 :

[0040] The present invention provides a trolley with a lifting structure, including: a carriage 1;

[0041] A door 14 is installed on the carriage 1 through a hinge. Two sets of supports 11 are installed at the lower end of the carriage 1 through bolts. A first wheel 111 is installed on each of the two sets of supports 11. And two sets of bases 12 are installed at the lower end of the carriage 1 through bolts. A second wheel 121 is installed on each of the two sets of bases 12. Two sets of third wheels 13 are installed at the front end of the carriage 1 through bolts. And both the second wheel 121 and the third wheel 13 are universal wheels. Two sets of rail plates 3 are installed at the rear end of the carriage 1 through bolts. A sliding seat 31 slides on each of the two sets of rail plates 3. A rotatable clamping plate 311 is installed on each of the two sets of sliding seats 31. A handle 312 is welded on each of the two sets of clamping plates 311. And two sets of slot plates 32 are installed at the rear end of the carriage 1 through bolts. Three slots are provided on the slot plate 32. A fixed column 33 is fixed on each of the two sets of sliding seats 31. A tooth groove structure is provided at the rear end of each of the two sets of fixed columns 33;

[0042] A control box 4 is installed at the lower end of the carriage 1 through bolts. A power module and a wireless control module are arranged inside the control box 4. A lithium battery pack is used as the power supply, which has overcharge, over-discharge, and short-circuit protection functions. An LCD screen is arranged outside the control box 4.

[0043] In the embodiments of the present disclosure,

[0044] Two sets of fixed columns 33 are installed with push rods 331. Tooth-shaped seats 332 are fixed at both the left and right ends of the push rod 331. Tooth-shaped structures are provided on both sets of tooth-shaped seats 332. The two sets of tooth-shaped seats 332 are respectively engaged with the tooth groove structures on the two sets of fixed columns 33. And the tooth-shaped seat 332 and the fixed column 33 are connected by a screw. A spring 333 is sleeved on the screw. The spring 333 is located between the tooth-shaped seat 332 and the fixed column 33. Its function is: when the user loosens the screw between the tooth-shaped seat 332 and the fixed column 33, the tooth-shaped structure on the tooth-shaped seat 332 will be separated from the tooth groove structure on the fixed column 33. At this time, the user can freely adjust the angle of the push rod 331. In actual use, users of different heights have different comfortable operating angles. In this way, the user can adjust the push rod 331 to the most suitable angle for themselves, optimize the operation feel, and reduce operation fatigue.

[0045] In the embodiment of the present disclosure,

[0046] Two sets of connecting seats 15 are installed at the lower end of the carriage 1 by bolts. Brakes 151 are installed at the lower ends of the two sets of connecting seats 15. The two sets of brakes 151 are respectively located behind the two sets of first wheels 111. Its function is: when the trolley reaches the designated position, whether it stops at the operating table in the cleaning and disinfection area or is temporarily stored in places such as warehouses, the first wheel 111 can be braked by pulling the brake 151.

[0047] Embodiment 2, on the basis of Embodiment 1,

[0048] Inside the carriage 1, there is a movable pallet 2. Wall plates 21 are provided at both the front and rear ends of the movable pallet 2. The two groups of wall plates 21 are respectively installed on the inner walls on the left and right sides of the carriage 1 by bolts. Rail rods 22 are installed on both groups of wall plates 21 by bolts. Connecting plates 221 slide on both groups of rail rods 22. And motor seats 222 and belt pulleys are installed on both groups of rail rods 22 by bolts. A first motor 223 is installed on the motor seat 222 by bolts. A belt pulley is fixed on the output shaft of the first motor 223. A transmission belt 224 is connected between the belt pulley on the output shaft of the first motor 223 and the belt pulley on the rail rod 22. A fixing seat 225 is installed on the connecting plate 221 by bolts. The fixing seat 225 is of an L-shaped structure. The fixing seat 225 is fixedly connected with the transmission belt 224. And a waist-shaped through groove is provided on the fixing seat 225. The fixing seat 225 is connected to the connecting plate 221 by bolts. Two groups of rail seats 23 are installed on both groups of wall plates 21. Two groups of movable seats 231 slide on both groups of rail seats 23. The movable pallet 2 is fixed on the four groups of movable seats 231. And the two groups of movable seats 231 close to the upper side of the movable pallet 2 are respectively connected to the two groups of connecting plates 221 by bolts. Its function is: The first motor 223 serves as a power source. When starting, its output shaft drives the belt pulley of itself to rotate. The power is transmitted to the belt pulley on the rail rod 22 through the transmission belt 224, thereby causing the rail rod 22 to rotate. Since the connecting plate 221 slides on the rail rod 22, and the fixing seat 225 is fixedly connected with the transmission belt 224, and the fixing seat 225 is also connected to the connecting plate 221 by bolts, so driven by the transmission belt 224, the connecting plate 221 will slide smoothly along the rail rod 22. And the two groups of movable seats 231 close to the upper side of the movable pallet 2 are respectively connected to the two groups of connecting plates 221 by bolts, and the movable pallet 2 is fixed on the four groups of movable seats 231. This enables the movable pallet 2 to be driven as the connecting plate 221 moves. When loading and unloading goods, the medical staff only need to start the first motor 223, and the movable pallet 2 can automatically slide out of the carriage 1, without the need for manual labor to carry the goods in and out of the carriage 1. This not only significantly reduces the labor intensity but also greatly improves the efficiency of goods loading and unloading.

[0049] Embodiment 3, on the basis of Embodiment 1 and Embodiment 2,

[0050] Inside the carriage 1, a partition plate 24 is installed, and two groups of guide rods 241 are fixed inside the carriage 1. The partition plate 24 slides on the two groups of guide rods 241. Moreover, bearing seats 242 and fitting seats 243 are installed on the inner walls of the front and rear sides of the carriage 1 by bolts. On both of the two groups of fitting seats 243, second motors 2431 are installed by bolts. A lead screw 244 is installed between the bearing seat 242 and the fitting seat 243. The output shaft of the second motor 2431 is connected to the lead screw 244. U-shaped frame plates 246 are fixed at both the left and right ends of the partition plate 24. Square seats 245 are installed on both of the two groups of U-shaped frame plates 246 by bolts. Threaded cylinders 2451 are installed on the square seats 245 by bolts. The two groups of threaded cylinders 2451 are respectively in threaded cooperation with the two groups of lead screws 244. Moreover, a connecting rod 247 is installed between the fitting seat 243 and the bearing seat 242. Two rollers 2452 are installed on the square seat 245. The connecting rod 247 is located between the two rollers 2452. Both of the two rollers 2452 on the square seat 245 are in contact with the connecting rod 247. Its function is as follows: The second motor 2431 serves as the power core. When it starts to operate, its output shaft drives the lead screw 244 to rotate. Since the threaded cylinder 2451 is in threaded cooperation with the lead screw 244, and the threaded cylinder 2451 is installed on the square seat 245, the square seat 245 is fixed on the U-shaped frame plate 246 by bolts, and the U-shaped frame plate 246 is connected to the partition plate 24, this enables the partition plate 24 to smoothly slide along the two groups of guide rods 241 under the drive of the lead screw 244. Medical staff can flexibly control the second motor 2431 according to different situations such as the size, shape, and quantity of the medical devices actually carried, and accurately adjust the position of the partition plate 24 inside the carriage 1.

[0051] The working principle of this embodiment is as follows: in terms of movement, when the moving trajectory needs to be precisely controlled in a narrow space, the user lifts the push rod 331, so that the trolley can be precisely controlled by the No. 1 wheel 111 alone; in an open space where frequent turning is required, the universal characteristics of the No. 2 wheel 121 and the No. 3 wheel 13 are used in combination with the No. 1 wheel 111 to achieve easy turning. When reaching the designated position, the No. 1 wheel 111 is rotated by the brake 151 to achieve parking. When loading and unloading goods, the No. 1 motor 223 is driven to rotate the pulley, and the transmission belt 22 4 makes the rail rod 22 rotate, driving the connecting plate 221 fixedly connected to the transmission belt 224 and sliding on the rail rod 22, and then driving the moving seat 231 connected to the connecting plate 221 and the moving support plate 2 fixed thereon to automatically slide out or slide into the carriage 1. When the interior space of the carriage 1 is adjusted, after the second motor 2431 is started, its output shaft drives the screw rod 244 to rotate, and the threaded cylinder 2451 threadedly matched with the screw rod 244 is installed on the square seat 245, and the square seat 245 is fixed to the U-shaped frame plate 246 by bolts. The frame plate 246 is connected to the partition plate 24, so that the partition plate 24 slides smoothly on the two sets of guide rods 241. The roller 2452 on the square seat 245 contacts the connecting rod 247, which plays an auxiliary supporting and guiding role when the partition plate 24 moves, reduces friction, and ensures smooth adjustment of the internal space of the carriage 1. When the user loosens the screw between the toothed seat 332 and the fixed column 33, the toothed structure on the toothed seat 332 and the toothed structure on the fixed column 33 will separate. At this time, the user can freely adjust the angle of the push rod 331. When the user pulls the handle 312 to separate the locking plate 311 from the slot on the slot plate 32, the sliding seat 31 can slide freely on the track plate 3. Since the push rod 331 is installed on the fixed column 33, and the fixed column 33 is connected to the sliding seat 31, the movement of the sliding seat 31 can drive the height adjustment of the push rod 331. After adjusting to a suitable height, the locking plate 311 is rotated again to make it snap into the slot of the slot plate 32, so that the position of the push rod 331 can be fixed. Users of different heights can operate at a height that is comfortable for them.

[0052] The technical solutions of the present invention are not limited to the scope of the embodiments of the present invention, and the technical contents not described in detail in the present invention are all well-known technologies.

Claims

1. A trolley with a lifting structure, comprising: The carriage (1) is characterized in that: a door (14) is installed on the carriage (1); two sets of supports (11) are installed at the lower end of the carriage (1); a first wheel (111) is installed on both sets of supports (11); two sets of bases (12) are installed at the lower end of the carriage (1); a second wheel (121) is installed on both sets of bases (12); two sets of third wheels (13) are installed at the front end of the carriage (1); and both the second wheel (121) and the third wheel (13) are universal wheels; the carriage (1) Two groups of rail plates (3) are installed at the rear end, and sliding seats (31) are slidably mounted on the two groups of rail plates (3). Rotatable clamping plates (311) are installed on the two groups of sliding seats (31). Handles (312) are welded on the two groups of clamping plates (311). Two groups of slot plates (32) are installed at the rear end of the carriage (1), and three groups of slots are arranged on the slot plates (32). Fixed columns (33) are fixed on the two groups of sliding seats (31), and tooth groove structures are arranged at the rear ends of the two groups of fixed columns (33).

2. The trolley with a lifting structure according to claim 1, characterized in that: The two groups of fixed columns (33) are equipped with push rods (331), and toothed seats (332) are fixed at both left and right ends of the push rods (331). The two groups of toothed seats (332) are provided with toothed structures. The two groups of toothed seats (332) are respectively engaged with the tooth groove structures on the two groups of fixed columns (33), and the toothed seats (332) and the fixed columns (33) are connected by a screw rod, and a spring (333) is sleeved on the screw rod. The spring (333) is located between the toothed seat (332) and the fixed column (33).

3. The trolley with a lifting structure according to claim 1, characterized in that: Two groups of connecting seats (15) are installed at the lower end of the carriage (1) by means of bolts, and brakes (151) are installed at the lower ends of the two groups of connecting seats (15). The two groups of brakes (151) are respectively located behind the two groups of number one wheels (111).

4. The trolley with a lifting structure according to claim 1, characterized in that: A movable support plate (2) is arranged inside the carriage (1), and the front and rear ends of the movable support plate (2) are both provided with wall plates (21), two sets of wall plates (21) are respectively mounted on the inner walls of the left and right sides of the carriage (1), rail rods (22) are mounted on the two sets of wall plates (21), connecting plates (221) are slidably mounted on the two sets of rail rods (22), and motor seats (222) and pulleys are mounted on the two sets of rail rods (22), a No. 1 motor (223) is mounted on the motor seat (222), a pulley is fixed on the output shaft of the No. 1 motor (223), and a transmission belt (224) is connected between the pulley on the output shaft of the No. 1 motor (223) and the pulley on the rail rod (22).

5. The trolley with a lifting structure according to claim 4, characterized in that: A fixing seat (225) is installed on the connecting plate (221). The fixing seat (225) is an L-shaped structure. The fixing seat (225) is fixedly connected to the transmission belt (224). A waist-shaped through groove is provided on the fixing seat (225). The fixing seat (225) is connected to the connecting plate (221) by bolts. Two groups of rail seats (23) are installed on both groups of wall panels (21).

6. The trolley with a lifting structure according to claim 5, characterized in that: Two groups of moving seats (231) are slidably mounted on the two groups of rail seats (23), the moving support plate (2) is fixed on the four groups of moving seats (231), and the two groups of moving seats (231) close to the upper part of the moving support plate (2) are respectively connected to the two groups of connecting plates (221) by bolts.

7. The trolley with a lifting structure according to claim 4, characterized in that: A partition plate (24) is installed inside the carriage (1), two groups of guide rods (241) are fixed inside the carriage (1), the partition plate (24) slides on the two groups of guide rods (241), and a bearing seat (242) and a matching seat (243) are installed on the inner walls of the front and rear sides of the carriage (1) through bolts.

8. The trolley with a lifting structure according to claim 7, characterized in that: A second motor (2431) is mounted on both sets of the matching seats (243) by means of bolts, a screw rod (244) is mounted between the bearing seat (242) and the matching seat (243), an output shaft of the second motor (2431) is connected to the screw rod (244), and a U-shaped frame plate (246) is fixed to the left and right ends of the partition plate (24).

9. The trolley with a lifting structure according to claim 8, characterized in that: The two groups of U-shaped frame plates (246) are both installed with square seats (245), and threaded cylinders (2451) are installed on the square seats (245) through bolts. The two groups of threaded cylinders (2451) are respectively threadedly matched with the two groups of screw rods (244), and a connecting rod (247) is installed between the matching seat (243) and the bearing seat (242). Two groups of rollers (2452) are installed on the square seats (245), and the connecting rod (247) is located between the two groups of rollers (2452). The two groups of rollers (2452) on the square seats (245) are both in contact with the connecting rod (247).

10. The trolley with a lifting structure according to claim 7, characterized in that: A control box (4) is installed at the lower end of the carriage (1), a power module and a wireless control module are arranged inside the control box (4), a lithium battery pack is used as a power supply, and has overcharge, over-discharge and short-circuit protection functions, and a liquid crystal display screen is arranged outside the control box (4).

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