Mobile cart chassis and mobile medical device

Abstract

The application relates to the technical field of medical auxiliary equipment, in particular to a mobile vehicle chassis and a mobile medical device, which comprises a mobile base and a plurality of lifting wheel groups arranged on the mobile base at intervals; each lifting wheel group comprises a caster, a transmission wheel, a threaded lifting rod and a threaded connecting sleeve coaxially fixedly connected with the transmission wheel; the transmission wheel is movably mounted on the mobile base, the threaded lifting rod is threadedly matched in the threaded connecting sleeve in the vertical direction, and the lower end of the threaded lifting rod is connected with the caster; when the transmission wheel is driven to rotate by external force, the caster is driven to lift in the vertical direction through the thread cooperation between the threaded connecting sleeve and the threaded lifting rod. The application can not only reduce the overall gravity center, but also realize reliable support and improve the overall stability.

Description

Technical Field

[0001] This application relates to the field of medical auxiliary equipment technology, and more specifically, to a mobile vehicle chassis and a mobile medical device. Background Technology

[0002] To facilitate transport and flexible deployment, instruments such as monitors, infusion pumps, anesthesia machines, and ultrasound diagnostic instruments are typically equipped with casters that have locking functions. When in use, the operator pushes the equipment to the work area and locks the casters by stepping on or turning them to secure the equipment and begin operation.

[0003] However, this method of fixing devices that relies on the self-locking of the casters has significant drawbacks: even when the casters are locked, the contact between them and the ground is still point contact or a small area contact. Under the vibration or reaction force generated by the medical instrument during operation, the casters are prone to slight slippage or wobbling. Although this displacement is difficult to detect with the naked eye, it can significantly affect the positioning accuracy and operational stability of the equipment. For high-precision medical equipment (such as interventional surgical navigation systems, precision infusion devices, or image acquisition devices), such slippage may lead to operational errors, blurred images, or even safety risks, severely limiting their reliable application in clinical settings.

[0004] To overcome the aforementioned problems, some medical equipment employs a composite support structure combining casters and adjustable feet. Specifically, after the equipment is moved to its target location via casters, the mechanical feet located at the four corners of the equipment's bottom must be manually tightened to lift the entire device, removing the casters from the ground and allowing the feet to directly bear the weight and achieve rigid fixation. While this method effectively prevents caster slippage, it raises the equipment's center of gravity, especially when the feet are extended significantly, reducing overall stability and posing a risk of tipping over. Utility Model Content

[0005] The purpose of this application is to provide a mobile vehicle chassis and a mobile medical device, which can not only lower the overall center of gravity, but also achieve reliable support and improve overall stability.

[0006] This application is implemented as follows:

[0007] In a first aspect, this application provides a mobile vehicle chassis, including a mobile base and a plurality of lifting wheel assemblies spaced apart on the mobile base; each lifting wheel assembly includes a caster, a drive wheel, a threaded lifting rod, and a threaded connecting sleeve coaxially and fixedly connected to the drive wheel; the drive wheel is movably mounted on the mobile base, the threaded lifting rod is threadedly engaged in the threaded connecting sleeve in the vertical direction, and the lower end of the threaded lifting rod is connected to the caster; when the drive wheel is driven to rotate by an external force, the threaded engagement between the threaded connecting sleeve and the threaded lifting rod drives the caster to rise and fall in the vertical direction.

[0008] As an optional implementation, it also includes a drive mechanism and a synchronous transmission component, wherein the synchronous transmission component connects the drive mechanism and the plurality of transmission wheels to make the transmission wheels rotate synchronously, thereby driving the casters to rise and fall synchronously.

[0009] As an optional implementation, the drive mechanism includes a motor, a reducer, and a transmission shaft connected to the output end of the reducer; the motor drives the transmission shaft to rotate through the reducer; the transmission wheel includes a driven sprocket, and the transmission shaft is provided with a driving sprocket, the driving sprocket being linked with the driven sprocket through a transmission chain.

[0010] As an optional implementation, the drive sprocket includes a first drive sprocket and a second drive sprocket arranged axially at intervals along the drive shaft; the first drive sprocket is connected to the driven sprockets of at least two lifting wheel sets via one of the drive chains; and / or, the second drive sprocket is connected to the driven sprockets of at least two lifting wheel sets via another of the drive chains.

[0011] As an optional implementation, a tensioning structure is also included; the tensioning structure includes an adjusting seat and a tensioning sprocket rotatably disposed on the adjusting seat, the tensioning sprocket engaging with the transmission chain to adjust the tension of the transmission chain; the adjusting seat is detachably fixed to the movable base by a locking structure, the locking structure being used to lock the position of the adjusting seat after the tension is adjusted.

[0012] As an optional implementation, the adjusting seat is provided with a position adjusting groove through which the locking structure passes. The extending direction of the position adjusting groove is consistent with the tensioning direction of the transmission chain, and is used to adjust the pressing position of the tensioning sprocket on the transmission chain.

[0013] As an optional implementation, each of the drive chains is provided with multiple tensioning structures spaced apart along the chain path.

[0014] As an optional implementation, the drive mechanism is mounted on the side of the mobile base away from the ground.

[0015] As an optional implementation, the outer periphery of the threaded connection sleeve is also fitted with a bearing that is connected to the movable base.

[0016] Secondly, this application provides a mobile medical device, including the aforementioned mobile vehicle chassis and a medical instrument mounted on the mobile vehicle chassis.

[0017] The beneficial effects of this application include:

[0018] The mobile vehicle chassis and mobile medical equipment provided in this application achieve synchronous vertical lifting of the casters by setting multiple lifting wheel sets consisting of transmission wheels, threaded connecting sleeves, and threaded lifting rods on the mobile vehicle chassis. During transportation, the casters extend for flexible movement; during operation, the casters retract as a whole, allowing the mobile base to directly contact the ground, forming a low center of gravity and large-area rigid support. This effectively avoids the micro-slippage problem caused by point contact in traditional locking casters, while overcoming the shortcomings of adjustable feet that require raising the center of gravity of the equipment, are cumbersome to operate, and are difficult to level. This significantly improves the stability, positioning accuracy, and safety of the medical equipment during operation, and is especially suitable for clinical applications of high-precision medical instruments. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is one of the structural schematic diagrams of the mobile vehicle chassis according to an embodiment of this application;

[0021] Figure 2 This is a second schematic diagram of the structure of the mobile vehicle chassis according to an embodiment of this application;

[0022] Figure 3 This is the third structural schematic diagram of the mobile vehicle chassis according to an embodiment of this application;

[0023] Figure 4 This is the fourth structural schematic diagram of the mobile vehicle chassis according to an embodiment of this application;

[0024] Figure 5 This is the fifth structural schematic diagram of the mobile vehicle chassis in the embodiments of this application.

[0025] Icons: 100-Mobile base; 101-Lifting wheel assembly; 102-Cast wheel; 103-Drive wheel; 104-Threaded lifting rod; 105-Threaded connecting sleeve; 106-Drive mechanism; 107-Motor; 108-Reducer; 109-Drive shaft; 110-Drive chain; 111-First drive sprocket; 112-Second drive sprocket; 113-Tensioning structure; 114-Adjusting seat; 115-Position adjustment groove; 116-Bearing. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0028] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] To facilitate transport and flexible deployment, instruments such as monitors, infusion pumps, anesthesia machines, and ultrasound diagnostic instruments are typically equipped with casters that have locking functions. When in use, the operator pushes the equipment to the work area and locks the casters by stepping on or turning them to secure the equipment and begin operation.

[0031] However, this method of fixing devices that relies on the self-locking of the casters has significant drawbacks: even when the casters are locked, the contact between them and the ground is still point contact or a small area contact. Under the vibration or reaction force generated by the medical instrument during operation, the casters are prone to slight slippage or wobbling. Although this displacement is difficult to detect with the naked eye, it can significantly affect the positioning accuracy and operational stability of the equipment. For high-precision medical equipment (such as interventional surgical navigation systems, precision infusion devices, or image acquisition devices), such slippage may lead to operational errors, blurred images, or even safety risks, severely limiting their reliable application in clinical settings.

[0032] To overcome the aforementioned problems, some medical equipment employs a composite support structure combining casters and adjustable feet. Specifically, after the equipment is moved to its target location via casters, the mechanical feet located at the four corners of the equipment's bottom must be manually tightened to lift the entire device, removing the casters from the ground and allowing the feet to directly bear the weight and achieve rigid fixation. While this method effectively prevents caster slippage, it raises the equipment's center of gravity, especially when the feet are extended significantly, reducing overall stability and posing a risk of tipping over.

[0033] To address the aforementioned technical problems, this application provides a mobile vehicle chassis and a mobile medical device.

[0034] Reference Figure 1 , Figure 2 As shown, the mobile vehicle chassis provided in this application embodiment includes a mobile base 100 and a plurality of lifting wheel sets 101 spaced apart on the mobile base 100; each lifting wheel set 101 includes a caster 102, a drive wheel 103, a threaded lifting rod 104, and a threaded connecting sleeve 105 coaxially and fixedly connected to the drive wheel 103; the drive wheel 103 is movably mounted on the mobile base 100, and the threaded lifting rod 104 is threadedly engaged in the threaded connecting sleeve 105 in the vertical direction, with the lower end of the threaded lifting rod 104 connected to the caster 102; when the drive wheel 103 is driven to rotate by an external force, the threaded engagement between the threaded connecting sleeve 105 and the threaded lifting rod 104 drives the caster 102 to rise and fall in the vertical direction.

[0035] It should be noted that, in operation, the mobile chassis provided in this embodiment rotates by driving the transmission wheel 103, which in turn drives the threaded connecting sleeve 105, which is coaxially fixed therewith, to rotate synchronously. Since the threaded lifting rod 104 is threadedly engaged with the threaded connecting sleeve 105 and its lower end is connected to the caster 102, and the caster 102 is constrained by the ground and cannot rotate accordingly, the threaded lifting rod 104 generates linear motion in the vertical direction under the influence of the thread, thereby achieving synchronous lifting and lowering of the caster 102. In the transport state, the caster 102 extends and contacts the ground, supporting the entire chassis for flexible movement. Upon reaching the work area, the reverse drive wheel 103 retracts the caster 102, allowing the bottom of the mobile base 100 to directly contact the ground, forming a large-area, low-center-of-gravity rigid support. This completely eliminates the risk of caster 102 slippage, while avoiding raising the equipment's center of gravity, thus balancing ease of movement and operational stability.

[0036] It should be noted that feet can also be provided at the bottom of the mobile base 100. In the transport state, the casters 102 extend and contact the ground, supporting the entire chassis for flexible movement. After reaching the work area, the reverse drive wheel 103 retracts the casters 102, allowing the feet at the bottom of the mobile base 100 to directly contact the ground for support. To avoid raising the center of gravity, the vertical extension distance of the feet can be shortened. The embodiments of this application do not impose special limitations on the height of the feet; those skilled in the art can choose according to their needs.

[0037] This embodiment of the application achieves the synchronous vertical lifting function of the casters 102 by setting multiple lifting wheel sets 101, consisting of transmission wheels 103, threaded connecting sleeves 105, and threaded lifting rods 104, on the chassis of the mobile vehicle. During transport, the casters 102 extend for flexible movement; during operation, the casters 102 retract as a whole, allowing the mobile base 100 to directly contact the ground, forming a low center of gravity and large-area rigid support. This effectively avoids the micro-slippage problem caused by point contact in traditional locking casters 102, while overcoming the shortcomings of adjustable feet that require raising the equipment's center of gravity, are cumbersome to operate, and are difficult to level. This significantly improves the stability, positioning accuracy, and safety of medical equipment during operation, making it suitable for clinical applications of high-precision medical instruments.

[0038] Furthermore, refer to Figure 2 As shown, in an optional implementation, a bearing 116 connected to the movable base is also fitted around the outer periphery of the threaded connecting sleeve 105. This bearing 116 supports the threaded connecting sleeve 105 and the transmission wheel 103 coaxially fixed therewith, allowing it to rotate smoothly around its central axis while effectively limiting its axial movement. This structure ensures that the threaded connecting sleeve 105 remains stably positioned when the transmission wheel 103 is driven to rotate, transmitting only rotational motion without vertical displacement. This allows the threaded lifting rod 104 to achieve precise and reliable vertical lifting motion under threaded side effects, avoiding jamming, wear, or asynchronous lifting caused by vibration or uneven load of the transmission components. This significantly improves the working accuracy, operational stability, and service life of the lifting wheel assembly 101.

[0039] Reference Figure 1 , Figure 2 as well as Figure 3 As shown, as an optional implementation, it also includes a drive mechanism 106 and a synchronous transmission component. The synchronous transmission component connects the drive mechanism 106 with multiple transmission wheels 103 so that each transmission wheel 103 rotates synchronously, thereby driving the casters 102 to rise and fall synchronously.

[0040] It should be noted that, in an optional embodiment of this application, the mobile chassis further includes a drive mechanism 106 and a synchronous transmission component. During operation, the drive mechanism 106 outputs rotational power, which is transmitted simultaneously to the transmission wheels 103 of multiple lifting wheel sets 101 via a synchronous transmission component, such as a linkage shaft, chain, synchronous belt, or gear set, so that each transmission wheel 103 rotates strictly synchronously. Since each transmission wheel 103 is coaxially fixed with a threaded connecting sleeve 105, its rotation will drive the corresponding threaded lifting rod 104 to extend and retract synchronously in the vertical direction, thereby driving all casters 102 to lift and retract synchronously. During transport, the casters 102 extend synchronously to support the chassis for movement, and during operation, the casters 102 retract synchronously, so that the mobile base 100 or the feet set on the mobile base 100 touch the ground to form a stable support, ensuring that the equipment is level and consistent without tilting, significantly improving the ease of operation and structural stability in the working state.

[0041] Reference Figure 3 As shown, in one optional implementation, the drive mechanism 106 includes a motor 107, a reducer 108, and a transmission shaft 109 connected to the output end of the reducer 108; the motor 107 drives the transmission shaft 109 to rotate through the reducer 108; the transmission wheel 103 includes a driven sprocket, and the transmission shaft 109 is provided with a driving sprocket, which is linked to the driven sprocket through the transmission chain 110.

[0042] In this optional embodiment of the application, the drive mechanism 106 consists of a motor 107, a reducer 108, and a transmission shaft 109. The power output by the motor 107 is reduced in speed and increased in torque by the reducer 108 to drive the transmission shaft 109 to rotate. The transmission shaft 109 is provided with a drive sprocket, which is connected to multiple driven sprockets through a transmission chain 110. When the motor 107 starts, the power is transmitted sequentially through the reducer 108, the transmission shaft 109, the drive sprocket, and the transmission chain 110 to each driven sprocket, thereby driving all the threaded lifting rods 104 to rotate synchronously. Since each driven sprocket and its corresponding threaded lifting rod 104 form a screw pair through a threaded connecting sleeve 105, the synchronous rotation of the driven sprocket drives each threaded lifting rod 104 to extend and retract synchronously in the vertical direction, thereby realizing the synchronous lifting and lowering of the caster 102.

[0043] Reference Figure 3 As shown, in one optional implementation, the driving sprocket includes a first driving sprocket 111 and a second driving sprocket 112 arranged axially at intervals along the drive shaft 109; the first driving sprocket 111 is connected to the driven sprockets of at least two lifting wheel sets 101 via a drive chain 110; and / or, the second driving sprocket 112 is connected to the driven sprockets of at least two lifting wheel sets 101 via another drive chain 110.

[0044] It should be noted that, in this embodiment of the application, the transmission shaft 109 is provided with a first driving sprocket 111 and a second driving sprocket 112 spaced apart along the axial direction. They are respectively connected to the driven sprockets of multiple sets of lifting wheel groups 101 through their own independent transmission chains 110. The first driving sprocket 111 drives the driven sprockets of at least two lifting wheel groups 101 synchronously through one transmission chain 110, and the second driving sprocket 112 drives the driven sprockets of at least two other lifting wheel groups 101 synchronously through another transmission chain 110. When the drive mechanism 106 drives the transmission shaft 109 to rotate, the two drive sprockets rotate synchronously and transmit power to the corresponding multiple driven sprockets through their respective transmission chains 110, thereby realizing the zoned or full-area synchronous drive of multiple lifting wheel sets 101; each driven sprocket drives the transmission wheel 103 fixed on the same axis to rotate, and then drives the threaded lifting rod 104 and the caster 102 to rise and fall synchronously through the threaded pair structure, ensuring that the caster 102 extends smoothly when the chassis moves and reliably retracts when working.

[0045] For example, refer to Figure 1 , Figure 3 As shown, the first driving sprocket 111 synchronously drives the driven sprockets of two lifting wheel sets 101 through a transmission chain 110, and the two lifting wheel sets 101 serve as two front wheels; the second driving sprocket 112 synchronously drives the driven sprockets of another two lifting wheel sets 101 through another transmission chain 110, and the two lifting wheel sets 101 serve as rear wheels.

[0046] This embodiment of the application achieves zoned synchronous control of the front and rear wheel sets by setting a first drive sprocket 111 and a second drive sprocket 112 on the drive shaft 109, which synchronously drive the two sets of lifting wheel sets 101 on the front and rear wheel sides through independent drive chains 110. This embodiment of the application not only ensures that the lifting height of the two casters 102 on the same axle side (front wheel or rear wheel) is strictly consistent, avoiding chassis tilting, but also improves the flexibility of chain tension adjustment and the reliability of the transmission system through the zoned transmission layout; at the same time, this structure simplifies the transmission path and reduces the assembly difficulty while ensuring four-point synchronous leveling effect, effectively solving the problem of cumbersome and inconsistent leveling operations of traditional casters, enabling the mobile vehicle chassis to quickly form a low center of gravity and high stability rigid support in the working state, significantly improving the accuracy and safety of medical equipment operation.

[0047] Reference Figure 4 , Figure 5As shown, as an optional embodiment, a tensioning structure 113 is also included; the tensioning structure 113 includes an adjusting seat 114 and a tensioning sprocket rotatably disposed on the adjusting seat 114, the tensioning sprocket engaging with the transmission chain 110 to adjust the tension of the transmission chain 110; the adjusting seat 114 is detachably fixed to the movable base 100 by a locking structure, the locking structure being used to lock the position of the adjusting seat 114 after the tension is adjusted.

[0048] In this optional embodiment of the application, the tension of the transmission chain 110 is adjusted by setting a tensioning structure 113. The tensioning sprocket is rotatably mounted on the adjusting seat 114 and meshes with the transmission chain 110. When the transmission chain 110 becomes loose due to manufacturing tolerances, long-term use, or temperature changes, the position of the tensioning sprocket can be changed by moving the adjusting seat 114, thereby adjusting the tension of the transmission chain 110. After adjustment, the adjusting seat 114 is fixed to the movable base 100 using a locking structure to ensure a stable and reliable tension. This design effectively prevents problems such as chain slippage, tooth skipping, or asynchronous transmission, ensuring the consistency and reliability of the operation of multiple lifting wheel sets 101 during the driving process. At the same time, the structure is simple and the adjustment is convenient, improving the operational stability and service life of the entire chassis lifting system.

[0049] Reference Figure 5 As shown, as an optional implementation, the adjusting seat 114 is provided with a position adjusting groove 115 through which the locking structure passes. The extending direction of the position adjusting groove 115 is consistent with the tensioning direction of the transmission chain 110, and is used to adjust the pressing position of the tensioning sprocket on the transmission chain 110.

[0050] It should be noted that the adjusting seat 114 is provided with a position adjusting groove 115 through which a locking structure (such as a bolt) passes. The extending direction of the position adjusting groove 115 is consistent with the tensioning direction of the transmission chain 110. By moving the adjusting seat 114 along the position adjusting groove 115, the tensioning sprocket can be adjusted in the tensioning direction relative to the transmission chain 110, thereby precisely controlling the tension of the chain. After adjustment, the locking structure is tightened, which securely fixes the adjusting seat 114 to the movable base 100 and locks the tension state. This structure realizes continuous and convenient adjustment of tension, effectively avoiding the risk of transmission lag, asynchrony, or chain derailment caused by chain slack, and improving the reliability of synchronous lifting of multiple wheel sets and the stability of system operation.

[0051] Reference Figure 1 , Figure 4 As shown, as an optional implementation, each drive chain 110 has multiple tensioning structures 113 arranged at intervals along the chain path.

[0052] It should be noted that in this embodiment, each transmission chain 110 is provided with multiple tensioning structures 113 at intervals along its chain path. Each tensioning structure 113 includes a tensioning sprocket with an adjustable position, used to apply tension force to different sections of the chain. This design is suitable for chain drive systems with long transmission distances or complex routing paths, and can effectively suppress local slack, vibration, or tooth skipping caused by self-weight, load fluctuations, or thermal deformation of the chain during operation. Through multi-point coordinated tensioning, not only is the smoothness and synchronization accuracy of the transmission improved, but the reliability and durability of the entire lifting drive system are also enhanced, ensuring that multiple lifting wheel sets 101 can maintain consistent lifting action during long-term use, thereby ensuring the high stability support performance of the mobile vehicle chassis under the working state of medical equipment.

[0053] As an alternative implementation, the drive mechanism 106 is mounted on the side of the movable base 100 away from the ground.

[0054] It should be noted that, in this embodiment, the drive mechanism 106 is installed on the side of the mobile base 100 away from the ground, so that the power components are far from the ground, effectively avoiding contamination or damage to precision components such as the motor 107 and reducer 108 caused by liquid splashes, dust or cleaning and disinfection operations in the medical environment; at the same time, this layout helps to lower the center of gravity of the whole machine, improve the stability of the chassis in operation and working state, and facilitates the integration of wiring or structural docking with the functional modules of the upper medical equipment, ensuring transmission performance while taking into account safety and reliability in medical scenarios.

[0055] This application also provides a mobile medical device, including the aforementioned mobile vehicle chassis and a medical instrument mounted on the mobile vehicle chassis. This mobile medical device has the same structure and beneficial effects as the mobile vehicle chassis in the foregoing embodiments. The structure and beneficial effects of the mobile vehicle chassis have been described in detail in the foregoing embodiments and will not be repeated here.

[0056] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A mobile vehicle chassis, characterized in that, The device includes a movable base and multiple lifting wheel assemblies spaced apart on the movable base. Each lifting wheel assembly includes a caster, a drive wheel, a threaded lifting rod, and a threaded connecting sleeve coaxially and fixedly connected to the drive wheel. The drive wheel is movably mounted on the movable base, and the threaded lifting rod is threadedly engaged with the threaded connecting sleeve in the vertical direction. The lower end of the threaded lifting rod is connected to the caster. When the drive wheel is driven to rotate by an external force, the threaded engagement between the threaded connecting sleeve and the threaded lifting rod drives the caster to rise and fall in the vertical direction.

2. The mobile vehicle chassis according to claim 1, characterized in that, It also includes a drive mechanism and a synchronous transmission component, wherein the synchronous transmission component connects the drive mechanism to the plurality of transmission wheels so that each transmission wheel rotates synchronously, thereby driving the casters to rise and fall synchronously.

3. The mobile vehicle chassis according to claim 2, characterized in that, The drive mechanism includes a motor, a reducer, and a transmission shaft connected to the output end of the reducer; the motor drives the transmission shaft to rotate through the reducer; the transmission wheel includes a driven sprocket, and the synchronous transmission component includes a transmission chain; the driving sprocket on the transmission shaft is linked with the driven sprocket through the transmission chain.

4. The mobile vehicle chassis according to claim 3, characterized in that, The driving sprocket includes a first driving sprocket and a second driving sprocket arranged axially at intervals along the drive shaft; the first driving sprocket is connected to the driven sprockets of at least two lifting wheel sets via one of the drive chains; and / or, the second driving sprocket is connected to the driven sprockets of at least two lifting wheel sets via another of the drive chains.

5. The mobile vehicle chassis according to claim 3, characterized in that, It also includes a tensioning structure; the tensioning structure includes an adjusting seat and a tensioning sprocket rotatably disposed on the adjusting seat, the tensioning sprocket meshing with the transmission chain to adjust the tension of the transmission chain; The adjusting seat is detachably fixed to the movable base by a locking structure, which is used to lock the position of the adjusting seat after the tension is adjusted.

6. The mobile vehicle chassis according to claim 5, characterized in that, The adjusting seat is provided with a position adjusting groove through which the locking structure passes. The extending direction of the position adjusting groove is consistent with the tensioning direction of the transmission chain, and is used to adjust the pressing position of the tensioning sprocket on the transmission chain.

7. The mobile vehicle chassis according to claim 5 or 6, characterized in that, Each of the aforementioned transmission chains has multiple tensioning structures arranged at intervals along the chain path.

8. The mobile vehicle chassis according to any one of claims 2-6, characterized in that, The drive mechanism is installed on the side of the mobile base away from the ground.

9. The mobile vehicle chassis according to any one of claims 2-6, characterized in that, The threaded connecting sleeve is also fitted with a bearing that is connected to the movable base.

10. A mobile medical device, characterized in that, Includes the mobile vehicle chassis as described in any one of claims 1-9 and the medical device mounted on the mobile vehicle chassis.

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