Transport vehicle

Abstract

A transport vehicle, comprising a chassis (100), a carrying platform (200), and a lifting / lowering mechanism (300). The lifting / lowering mechanism (300) is provided between the carrying platform (200) and the chassis (100) and is used for controlling the carrying platform (200) to ascend and descend. The lifting / lowering mechanism (300) comprises a first threaded member (310) and a second threaded member (320). The first threaded member (310) is rotatably connected to the chassis (100). The second threaded member (320) is connected to the surface of the carrying platform (200) facing the chassis (100). The first threaded member (310) and the second threaded member (320) are sleeved on and in threaded fitting with each other. When the first threaded member (310) rotates relative to the chassis (100), the second threaded member (320) can drive the carrying platform (200) to ascend and descend in a first direction.

Description

transport vehicle Technical Field

[0001] This application relates to the field of transportation equipment technology, and more particularly to a handling vehicle. Background Technology

[0002] A pallet truck is a transport vehicle used for short-distance moving of goods and is widely used in industries such as manufacturing, warehousing and logistics, medical care, and retail. Summary of the Invention

[0003] This application discloses a transport vehicle, which includes a chassis, a carrying platform, and a lifting mechanism;

[0004] The support platform is mounted on the chassis, and the lifting mechanism is located between the support platform and the chassis, and is connected to both the support platform and the chassis. The lifting mechanism includes a first threaded component and a second threaded component, both extending along a first direction. The first threaded component is rotatably connected to the chassis, and the second threaded component is connected to the surface of the support platform facing the chassis. The first threaded component and the second threaded component are interlocked and threaded together. When the first threaded component rotates relative to the chassis, the second threaded component drives the support platform to move up and down along the first direction. The first direction is perpendicular to the surface of the chassis.

[0005] The technical solution adopted in this application can achieve the following technical effects:

[0006] The transport vehicle disclosed in this application utilizes the threaded engagement between the first and second threaded components to achieve the lifting and moving of the carrying platform. Since the lifting mechanism and the carrying platform are driven through threaded surface contact, swaying and skew are less likely to occur, thereby improving the stability of the transport vehicle's operation. Moreover, the lifting mechanism has a simple structure and does not require much installation space, thus reducing the height of the transport vehicle and making it applicable to a wider range of scenarios, thereby improving the flexibility of the transport vehicle's use. Attached Figure Description

[0007] Figure 1 is a schematic diagram of the assembly structure of the chassis, bearing platform, lifting mechanism and guiding mechanism disclosed in the embodiments of this application;

[0008] Figure 2 is a schematic diagram of the assembly structure of the chassis, lifting mechanism and guiding mechanism disclosed in the embodiments of this application;

[0009] Figure 3 is a schematic diagram of the assembly structure of the bearing platform and the second threaded component disclosed in the embodiment of this application;

[0010] Figure 4 is a side view of the carrying platform and lifting mechanism disclosed in the embodiments of this application;

[0011] Figure 5 is a cross-sectional view of the carrying platform and lifting mechanism disclosed in the embodiments of this application;

[0012] Figure 6 is one of the structural schematic diagrams of the transport vehicle disclosed in the embodiments of this application;

[0013] Figure 7 is a second schematic diagram of the structure of the transport vehicle disclosed in the embodiments of this application;

[0014] Figure 8 is a schematic diagram of the assembly structure of the chassis, lifting mechanism and guide mechanism disclosed in the embodiments of this application, wherein the first threaded part, reducer and bevel gear in the lifting mechanism are integrated in the housing.

[0015] Explanation of reference numerals in the attached figures:

[0016] 100 - Chassis, 101 - First Direction, 110 - Chassis Body, 120 - First Steering Wheel, 130 - Second Steering Wheel, 140 - Third Steering Wheel, 150 - Fourth Steering Wheel, 160 - Floating Beam

[0017] 200-Bearing Platform

[0018] 300-Lifting mechanism, 310-First threaded component, 311-Annular clearance groove, 320-Second threaded component, 330-Drive source, 340-Transmission assembly, 341-Reducer, 342-Bevel gear, 343-Gear ring, 350-Bearing seat, 360-Box housing

[0019] 400 - Guide mechanism, 410 - Sleeve, 420 - Sliding column

[0020] 500 - Housing. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0022] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more.

[0023] In related technologies, to enable a pallet truck to pick up and place goods, a liftable platform is installed on the truck, which is controlled by a scissor lift mechanism. However, scissor lift mechanisms are usually composed of multiple stacked cross links, making their structure relatively complex. During the movement of the pallet truck, the scissor lift mechanism is prone to swaying and tilting, which in turn affects the stability of the pallet truck's operation.

[0024] The technical solutions disclosed in the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0025] Please refer to Figures 1 to 7. This application discloses a transport vehicle, which may include a chassis 100, a carrying platform 200, and a lifting mechanism 300. The chassis 100 is the basic part of the transport vehicle, supporting the upper lifting mechanism 300, carrying platform 200, and guiding mechanism 400, and enabling corresponding movement and steering functions. The transport vehicle can be an AGV (Automated Guided Vehicle), which refers to a transport device equipped with electromagnetic or optical automatic guidance devices, capable of traveling along a predetermined guidance path, and possessing safety protection and various transfer functions; furthermore, the transport vehicle can also perform corresponding actions remotely.

[0026] The carrying platform 200 is mounted on the chassis 100 and is mainly used to carry goods. To facilitate the loading, unloading, and handling of goods, the carrying platform 200 can be designed to be height-adjustable. A lifting mechanism 300 can be installed between the carrying platform 200 and the chassis 100. The lifting mechanism 300 is connected to both the carrying platform 200 and the chassis 100, enabling the carrying platform 200 to be lifted and moved.

[0027] As shown in Figures 1 to 5, the first direction 101 is defined as perpendicular to the surface of the chassis 100. It should be noted that the surface of the chassis 100 is the surface of the chassis 100 facing the support platform 200. The surface of the chassis 100 can be approximated as a plane. The surface is mainly used to support the upper lifting mechanism 300, the support platform 200 and the guide mechanism 400. Considering that the support platform 200 will also be parallel to the surface of the chassis 100 during actual installation, the first direction 101 can also be perpendicular to the support platform 200.

[0028] The specific structure of the lifting mechanism 300 is described in conjunction with the first direction 101 above. The lifting mechanism 300 may include a first threaded component 310 and a second threaded component 320. Both the first threaded component 310 and the second threaded component 320 extend along the first direction 101, and each has a threaded structure, which also extends along the first direction 101. A rotating shaft, slide rail, or other components can be provided between the first threaded component 310 and the chassis 100 to achieve a rotatable connection between the first threaded component 310 and the chassis 100. The second threaded component 320 is connected to the surface of the bearing platform 200 facing the chassis 100, and the specific connection method can be bonding, bolting, riveting, snap-fitting, etc.

[0029] The first threaded component 310 and the second threaded component 320 are interlocked and threaded together. With the chassis 100 as a reference, this arrangement restricts relative rotation between the second threaded component 320 and the support platform 200 and the chassis 100. When the first threaded component 310 rotates relative to the chassis 100, the second threaded component 320 will rotate relative to the first threaded component 310. Utilizing the threaded engagement between the first threaded component 310 and the second threaded component 320, and with variations in the engagement length, the second threaded component 320 can move up and down along the first direction 101, thereby driving the support platform 200 to move up and down along the first direction 101. During this process, the first threaded component 310 and the second threaded component 320 remain in contact on their threaded surfaces, resulting in good stability.

[0030] The above-mentioned method for restricting the relative rotation of the second threaded component 320 and the bearing platform 200 with respect to the chassis 100 is as follows: A guide mechanism 400 can be provided between the bearing platform 200 and the chassis 100. The guide mechanism 400 can be located outside the lifting mechanism 300 and spaced apart from it. The guide mechanism 400 can extend and retract along the first direction 101, and both ends of the guide mechanism 400 along the first direction 101 are fixedly connected to the chassis 100 and the bearing platform 200, respectively. The guide mechanism 400 can specifically include a telescopic rod, a lifting slide rail, etc. By providing the guide mechanism 400, on the one hand, the relative rotation of the whole formed by the second threaded component 320 and the bearing platform 200 with respect to the chassis 100 can be restricted, so that the second threaded component 320 can rotate relative to the first threaded component 310 and achieve lifting and lowering; on the other hand, the guide mechanism 400 can make the bearing platform 200 rise and fall stably in the first direction 101.

[0031] As described above, the guide mechanism 400 can also function as a limiting device to restrict the overall rotation between the second threaded component 320 and the carrying platform 200 and the chassis 100. The transport vehicle disclosed in this application may include a limiting structure to restrict the overall rotation between the second threaded component 320 and the carrying platform 200 and the chassis 100. There may be one or more limiting structures. In embodiments with multiple limiting structures, multiple limiting structures can be provided on the chassis 100, extending along the first direction 101. These multiple limiting structures are spaced apart along the edge of the carrying platform 200 and contact the edge of the carrying platform 200 respectively, thereby constraining the carrying platform 200 within the limiting space formed by the multiple limiting structures. This allows the carrying platform 200 to only move up and down along the first direction 101 and prevents it from rotating relative to the chassis 100. It should be noted that the guide mechanism 400 described above is essentially a specific limiting structure; other types of limiting structures are also possible, and this application does not impose any limitations.

[0032] To ensure the stability of the bearing platform 200 during the lifting process, the setting position and extension length of the first threaded component 310 and the second threaded component 320 can be selected according to the center of gravity of the bearing platform 200, so that the center of gravity of the bearing platform 200 always falls on the axis of the first threaded component 310 and the second threaded component 320, thereby preventing the bearing platform 200 from tilting.

[0033] As described above, the transport vehicle disclosed in this application, by employing the aforementioned lifting mechanism 300, achieves its operation by means of threaded surface contact between the lifting mechanism 300 and the carrying platform 200, thus reducing the likelihood of swaying or tilting and improving the stability of the transport vehicle's operation. Moreover, the lifting mechanism 300 has a simple structure and does not require much installation space, thereby reducing the height of the transport vehicle and making it applicable to a wider range of scenarios, thereby improving the flexibility of the transport vehicle's use.

[0034] In one optional embodiment of this application, the first threaded component 310 can be a lead screw, and the second threaded component 320 can be a nut. The lead screw is rotatably connected to the chassis 100, and the axial direction of the lead screw is parallel to the first direction 101. A rotating shaft, slide rail, or other components can be provided between the lead screw and the chassis 100 to achieve the rotatable connection. The end face of the nut is fixedly connected to the surface of the bearing platform 200 facing the chassis 100. Specific connection methods can include bonding, riveting, or snap-fitting. The nut is fitted onto the lead screw and threadedly engages with it to form a lead screw pair. This lead screw pair can be a ball screw pair to reduce frictional resistance between the nut and the lead screw and extend its service life.

[0035] When the lead screw rotates relative to the chassis 100, the nut will rotate relative to the lead screw. Utilizing the threaded engagement between the lead screw and the nut, the nut can move up and down along the first direction 101 as the engagement length of the lead screw and nut changes, thereby driving the bearing platform 200 to move up and down along the first direction 101. During this process, the lead screw and the nut are always in contact on the threaded surface, resulting in good stability.

[0036] In another optional embodiment of this application, as shown in Figures 1 to 5, the first threaded component 310 can be a nut. A rotating shaft, slide rail, or other components can be provided between the nut and the chassis 100 to achieve a rotatable connection between the nut and the chassis 100. The second threaded component 320 can be a lead screw, with its axial direction parallel to the first direction 101. The end face of the lead screw is fixedly connected to the surface of the bearing platform 200 facing the chassis 100. Specific connection methods include bonding, riveting, and snap-fitting. The nut is fitted onto the lead screw and threadedly engages with it to form a lead screw pair. When the nut rotates relative to the chassis 100, the lead screw will rotate relative to the nut. Utilizing the threaded engagement between the lead screw and the nut, the lead screw can move up and down along the first direction 101 as the engagement length of the lead screw and nut changes, thus driving the bearing platform 200 to move up and down along the first direction 101. During this process, the lead screw and nut are always in contact on the threaded surface, resulting in good stability.

[0037] In the scheme where the first threaded component 310 is the nut and the second threaded component 320 is the lead screw, to ensure stable rotation of the nut, as shown in Figures 4 and 5, the lifting mechanism 300 may further include a bearing seat 350. The bearing seat 350 protrudes from the surface of the chassis 100, and the connection between the bearing seat 350 and the chassis 100 can be welding, riveting, bolting, etc. The bearing seat 350 can be an annular structure, with an annular clearance groove 311 formed on the end face of the nut facing the chassis 100. At least a portion of the bearing seat 350 extends into the annular clearance groove 311 and slides against the groove wall of the annular clearance groove 311 to achieve stable assembly of the nut and the bearing seat 350. A ball bearing can be installed between the groove wall of the annular clearance groove 311 and the bearing seat 350 to reduce friction during nut rotation. By setting the annular clearance groove 311, installation space can be provided for the bearing housing 350, so that the bearing housing 350 will not block the lead screw from extending into the nut, thereby ensuring that the lead screw and the nut have sufficient overlap length, which in turn increases the lifting stroke of the bearing platform 200.

[0038] Similarly, in the scheme where the first threaded component 310 is used as the lead screw and the second threaded component 320 is used as the nut, to ensure stable rotation of the lead screw, a bearing housing 350 can be used to cooperate with the lead screw. An annular clearance groove 311 is formed on the end face of the lead screw facing the chassis 100. At least a portion of the bearing housing 350 extends into the annular clearance groove 311 and slides against the groove wall of the annular clearance groove 311 to achieve stable assembly of the lead screw and the bearing housing 350. A ball bearing can be installed between the groove wall of the annular clearance groove 311 and the bearing housing 350 to reduce friction during lead screw rotation.

[0039] Please refer to Figure 5. The bearing housing 350 has an annular structure, including an inner annular surface and an outer annular surface. A ball bearing is installed between the outer annular surface and the groove wall of the annular clearance groove 311. By using the ball bearing, the friction between the bearing housing 350 and the nut or lead screw can be reduced, which helps to improve the service life. In the scheme where the first threaded part 310 is the nut and the second threaded part 320 is the lead screw, the inner annular surface of the bearing housing 350 can slide with the lead screw. That is to say, while the lead screw is engaged with the nut, it is also in contact with and slides with the inner annular surface of the bearing housing 350, thereby improving the stability of the lead screw and the installation of the bearing platform 200.

[0040] As shown in Figures 1 to 5, the lifting mechanism 300 may further include a drive source 330 and a transmission assembly 340. The drive source 330 may be a motor, a rotary cylinder, etc. The drive source 330 is connected to the chassis 100. The transmission assembly 340 may be a connecting rod, a transmission chain, a transmission belt, etc. The power input end of the transmission assembly 340 is connected to the output end of the drive source 330, and the power output end of the transmission assembly 340 is connected to the first threaded component 310 to drive the first threaded component 310 to rotate relative to the chassis 100, thereby driving the bearing platform 200 to move up and down along the first direction 101.

[0041] In one optional embodiment of this application, as shown in Figures 2, 4, and 5, the transmission assembly 340 may include a reducer 341, a bevel gear 342, and a gear ring 343. The main function of the reducer 341 is to reduce the rotational speed of the drive source 330 and increase the torque. The input end of the reducer 341 is connected to the drive source 330. The bevel gear 342 is connected to the output end of the reducer 341 and can rotate synchronously with the output end of the reducer 341. The gear ring 343 is sleeved on the outside of the first threaded member 310 and is fixedly connected to the first threaded member 310. The gear ring 343 and the first threaded member 310 can be manufactured separately and then assembled together by welding, bolting, riveting, etc. The gear ring 343 and the first threaded member 310 can also be an integral structure, with the peripheral edge of the first threaded member 310 extending radially to form the gear ring 343. When the drive source 330 rotates, the bevel gear 342 meshes with the gear ring 343, thereby driving the first threaded component 310 to rotate relative to the chassis 100, thus realizing the lifting control of the carrying platform 200. In this embodiment, since the transmission component 340 has a simple structure and occupies less space, it is beneficial to reduce the size of the transport vehicle.

[0042] In actual machining, the nut, bearing housing 350, and gear ring 343 can be machined as a whole to save installation space on the chassis 100. In some embodiments, if there is sufficient installation space, the nut, bearing housing 350, and gear ring 343 can also be machined separately and then assembled. In some embodiments, as shown in FIG8, the first threaded component, reducer, bevel gear, bearing housing, etc. can be integrated into the housing 360 as a whole, which facilitates maintenance and prevents other mechanisms from affecting the operation of the gear.

[0043] In an optional embodiment of this application, as shown in Figures 1 and 2, the guide mechanism 400 may include a sleeve 410 and a sliding post 420. The first end of the sleeve 410 is connected to the chassis 100, specifically by bolting, welding, etc. The second end of the sleeve 410 is an open end, through which the sliding post 420 extends into the sleeve 410. The sliding post 420 and the sleeve 410 can slide relative to each other along a first direction 101. The end of the sliding post 420 away from the chassis 100 is connected to the support platform 200, specifically by bolting, welding, etc. When the support platform 200 rises and falls along the first direction 101, the sliding post 420 and the sleeve 410 also slide relative to each other along the first direction 101. The limiting cooperation between the sliding post 420 and the sleeve 410 can constrain the rising and falling posture of the support platform 200, making its rising and falling process more stable; at the same time, it can also limit the rotation of the second threaded component 320 and the support platform 200.

[0044] In one optional embodiment of this application, the number of guide mechanisms 400 can be multiple, such as three, four, or five. These multiple guide mechanisms 400 can be arranged at intervals along the edge of the support platform 200 to provide guidance at different positions on the support platform 200. It should be noted that the surface of the support platform 200 facing the chassis 100 has an edge, which is the aforementioned edge of the support platform 200. The shape of the edge of the support platform 200 can be rectangular, circular, elliptical, etc. For example, taking a rectangular support platform 200 as an example, guide mechanisms 400 can be provided at all four corners of the support platform 200 to achieve stable guidance and, at the same time, restrict the rotation of the support platform 200.

[0045] As shown in Figures 1 and 2, the chassis 100 may include a chassis body 110, a first steering wheel 120, a second steering wheel 130, a third steering wheel 140, and a fourth steering wheel 150. The first steering wheel 120 and the second steering wheel 130 are rotatably disposed at the front end of the chassis body 110, and the third steering wheel 140 and the fourth steering wheel 150 are rotatably disposed at the rear end of the chassis body 110. It should be noted that the front and rear ends of the chassis body 110 can be the two ends of the chassis body 110 along its length. The steering wheels are drive wheels, mainly used to realize the walking and steering functions of the transport vehicle. By setting four steering wheels, the flexibility of the transport vehicle can be improved. The steering wheels and the lifting mechanism 300 can be powered by batteries, which can be installed on the surface of the chassis 100.

[0046] As shown in Figures 1 and 2, a floating beam 160 is also provided on the chassis 100. The middle part of the floating beam 160 is rotatably mounted to the rear end of the chassis body 110 via a connecting shaft. The third steering wheel 140 and the fourth steering wheel 150 are rotatably mounted at opposite ends of the floating beam 160. By setting up the floating beam 160, the contact state between the third steering wheel 140 and the fourth steering wheel 150 and the ground can be dynamically adjusted, enabling the transport vehicle to adapt to various complex road conditions. The floating beam floats according to the undulations of the ground, ensuring that both wheels on both sides can make contact with the ground, thus ensuring that all wheels of the vehicle can effectively make contact with the ground. For example, when there are potholes on the ground, the floating beam allows the third steering wheel and / or the fourth steering wheel to float downwards, always maintaining contact with the ground; when there are protrusions on the ground, the floating beam allows the third steering wheel and / or the fourth steering wheel to float upwards, always maintaining contact with the ground.

[0047] In some embodiments, alternatively, two steering wheels and two traveling wheels may be provided on the chassis. For example, the chassis 100 is provided with a first steering wheel, a second steering wheel, a first traveling wheel, and a second traveling wheel. The first steering wheel and the first traveling wheel are rotatably disposed at the front end of the chassis body, and the second steering wheel and the second traveling wheel are rotatably disposed at the rear end of the chassis body.

[0048] As shown in Figures 6 and 7, the transport vehicle may also include a housing 500, which is mounted on top of the chassis 100. The housing 500 and chassis 100 can be assembled by snap-fit, bolt connection, etc. The housing 500 can protect the components mounted on the chassis 100. The housing 500 also has an opening, and the carrying platform 200 is disposed in the opening and fits with the edge of the opening with a clearance. In addition, the side of the housing 500 is also provided with components such as a charging interface, a control switch, indicator lights, and sensors. The charging interface is used to charge the built-in battery, the control switch is used to control the opening and closing of the transport vehicle, the indicator lights can indicate the working status of the transport vehicle, and the sensors are used to realize the movement, obstacle avoidance, and other functions of the transport vehicle.

[0049] The above embodiments of this application focus on describing the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be described in detail here.

[0050] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A transport vehicle, comprising a chassis (100), a carrying platform (200), and a lifting mechanism (300); The carrying platform (200) is mounted on the chassis (100), and the lifting mechanism (300) is located between the carrying platform (200) and the chassis (100), and is connected to the carrying platform (200) and the chassis (100) respectively. The lifting mechanism (300) includes a first threaded component (310) and a second threaded component (320). Both the first threaded component (310) and the second threaded component (320) extend along a first direction (101). The first threaded component (310) is rotatably connected to the chassis (100), and the second threaded component (320) is connected to the surface of the bearing platform (200) facing the chassis (100). The first threaded component (310) and the second threaded component (320) are sleeved on each other and threadedly engaged. When the first threaded component (310) rotates relative to the chassis (100), the second threaded component (320) drives the bearing platform (200) to move up and down along the first direction (101); in, The first direction (101) is perpendicular to the surface of the chassis (100).

2. The transport vehicle according to claim 1, wherein, The first threaded component (310) is a lead screw, and the second threaded component (320) is a nut. The lead screw is rotatably connected to the chassis (100), and the end face of the nut is fixedly connected to the surface of the bearing platform (200) facing the chassis (100). The nut is sleeved on the lead screw and threadedly engaged with the lead screw to form a lead screw pair.

3. The transport vehicle according to claim 1, wherein, The first threaded component (310) is a nut, and the second threaded component (320) is a lead screw. The nut is rotatably connected to the chassis (100), and the end face of the lead screw is fixedly connected to the surface of the bearing platform (200) facing the chassis (100). The nut is sleeved on the lead screw and is threadedly engaged with the lead screw to form a lead screw pair.

4. The transport vehicle according to claim 2 or 3, wherein, The lifting mechanism (300) further includes a bearing seat (350), which protrudes from the surface of the chassis (100). The end face of the first threaded component (310) facing the chassis (100) is provided with an annular clearance groove (311). At least a portion of the bearing seat (350) extends into the annular clearance groove (311) and slides in cooperation with the groove wall of the annular clearance groove (311).

5. The transport vehicle according to claim 4, wherein, The bearing housing (350) has an annular structure and includes an inner annular surface and an outer annular surface. A ball bearing is provided between the outer annular surface and the groove wall of the annular clearance groove (311).

6. The transport vehicle according to claim 5, wherein, When the second threaded component (320) is a lead screw, the lead screw slides in contact with the inner annular surface.

7. The transport vehicle according to any one of claims 1 to 6, wherein, The lifting mechanism (300) also includes a drive source (330) and a transmission assembly (340); The drive source (330) is connected to the chassis (100), and the transmission assembly (340) is connected to the first threaded part (310) and the drive source (330) respectively. The drive source (330) drives the first threaded part (310) to rotate relative to the chassis (100) through the transmission assembly (340).

8. The transport vehicle according to claim 7, wherein, The transmission assembly (340) includes a reducer (341), a bevel gear (342), and a gear ring (343); The input end of the reducer (341) is connected to the drive source (330), the bevel gear (342) is connected to the output end of the reducer (341), and the gear ring (343) is sleeved on the outside of the first threaded part (310) and fixedly connected to the first threaded part (310). When the drive source (330) rotates, the bevel gear (342) meshes with the gear ring (343) to drive the first threaded member (310) to rotate relative to the chassis (100).

9. The transport vehicle according to any one of claims 1 to 8, wherein, The transport vehicle also includes a guide mechanism (400), which is located outside the lifting mechanism (300). The guide mechanism (400) is telescopically arranged along the first direction, and both ends of the guide mechanism (400) along the first direction (101) are fixedly connected to the chassis (100) and the carrying platform (200), respectively.

10. The transport vehicle according to claim 9, wherein, The guide mechanism (400) includes a sleeve (410) and a sliding post (420). The first end of the sleeve (410) is connected to the chassis (100), and the second end of the sleeve (410) is an open end. The sliding post (420) extends into the interior of the sleeve (410) through the second end and slides relative to the sleeve (410) along the first direction (101). The end of the sliding post (420) away from the chassis (100) is connected to the bearing platform (200).

11. The transport vehicle according to claim 10, wherein, The transport vehicle includes a plurality of the guide mechanisms (400), which are arranged at intervals along the edge of the carrying platform (200).

12. The transport vehicle according to any one of claims 1 to 11, wherein, The chassis (100) includes a chassis body (110) and a first steering wheel (120), a second steering wheel (130), a third steering wheel (140) and a fourth steering wheel (150). The first steering wheel (120) and the second steering wheel (130) are rotatably disposed at the front end of the chassis body (110), and the third steering wheel (140) and the fourth steering wheel (150) are rotatably disposed at the rear end of the chassis body (110).

13. The transport vehicle according to claim 12, wherein, The chassis (100) also includes a floating beam (160), the middle part of which is rotatably mounted to the rear end of the chassis body (110) via a connecting shaft, and the third steering wheel (140) and the fourth steering wheel (150) are rotatably disposed at opposite ends of the floating beam (160).

14. The transport vehicle according to any one of claims 1 to 13, further comprising a housing (500) covering and mounted on the chassis (100), the housing (500) having an opening, and the carrying platform (200) being disposed in the opening.

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