Carrier structure capable of moving in four directions

Abstract

The invention relates to the technical field of carrying equipment, and particularly discloses a carrying vehicle structure capable of moving in four directions, comprising a frame assembly, a fork assembly and a driving assembly, the frame assembly comprises a frame, the fork assembly comprises a fork arranged on the front side of the frame in a liftable manner, and the fork assembly comprises a driving assembly; the driving assembly comprises a driving wheel set located at the bottom of the frame and a driven wheel set located at the bottom of the front end of the pallet fork, and the core improvement of the forklift is that the driven wheel set adopts the unique hinge design of a first driven wheel (rolling in the front-back direction) and a second driven wheel (rolling in the left-right direction); the two driven wheels can be automatically driven to make contact with the ground alternately, when the pallet fork descends, the first driven wheel is grounded, and a vehicle can move front and back conveniently. When the pallet fork ascends, the second driven wheel is grounded, lateral movement of a vehicle is facilitated, the technical problems that turning of long-strip-shaped cargoes in a narrow space is difficult, and interference is prone to occurring are effectively solved, and carrying flexibility and efficiency are remarkably improved.

Description

Technical Field

[0001] This invention relates to the technical field of handling equipment, and specifically to a handling vehicle structure that can move in four directions. Background Technology

[0002] In construction sites, workshops, or logistics warehouses, the handling of long and narrow goods (such as steel pipes, profiles, and reinforcing bars) often presents problems such as difficulty in operation, easy scattering, and inconvenience in turning due to their large length and unstable center of gravity. Existing handling vehicles mostly use wheel sets with fixed directions, which make it difficult to achieve lateral movement in narrow spaces. Furthermore, long and narrow goods are prone to interference with the vehicle body or the surrounding environment when turning, resulting in low efficiency and safety risks.

[0003] For example, traditional pallet trucks often require additional binding and fixing or rely on special frames when transporting long rods, but they are still prone to getting stuck when passing through narrow passages. Some solutions attempt to improve adaptability through adjustable forks or telescopic structures, but they have failed to effectively solve the problem of flexibility in multi-directional movement. Summary of the Invention

[0004] This invention addresses the aforementioned problems and aims to provide a four-way movable transport vehicle structure. Through the linkage design of the articulated driven wheel set and the lifting of the forks, it achieves automatic switching between forward and backward movement and lateral movement, thereby improving the flexibility and stability of transporting long and narrow goods.

[0005] To achieve the above objectives, the present invention provides a four-way movable pallet truck structure, including a frame assembly, a fork assembly, and a drive assembly. The frame assembly includes a frame, the fork assembly includes liftable forks mounted on the front side of the frame, and the drive assembly includes a drive wheel assembly located at the bottom of the frame and a driven wheel assembly located at the bottom of the front end of the forks. The driven wheel assembly includes:

[0006] A first driven wheel is hinged to the bottom of the front end of the fork via a first wheel carrier. The first wheel carrier has a first hinge end and a second hinge end. The first hinge end is hinged to the fork. The first driven wheel is arranged at the second hinge end, and the rolling direction of the first driven wheel is arranged along the front-rear direction of the transport vehicle.

[0007] The second driven wheel is hinged to the second hinge end via the second wheel frame, and the rolling direction of the second driven wheel is arranged along the left and right direction of the transport vehicle;

[0008] An elastic element, disposed between the first wheel frame and the second wheel frame, is used to pull up the second wheel frame so that the initial height of the second driven wheel is higher than the initial height of the first driven wheel.

[0009] When the forks rise, the forks can drive the first wheel carrier to rotate clockwise and abut against the second wheel carrier. When the forks continue to rise, the second wheel carrier can rotate clockwise with the first wheel carrier, causing the end of the second wheel carrier on which the second driven wheel is mounted to descend, and making the bottom height of the second driven wheel lower than the bottom height of the first driven wheel.

[0010] When the forks descend, the forks can drive the first wheel carrier to rotate counterclockwise, and through the elastic element, drive the second wheel carrier to rotate counterclockwise, causing the end of the second wheel carrier on which the second driven wheel is mounted to rise, and making the bottom height of the second driven wheel higher than the bottom height of the first driven wheel.

[0011] According to the above-described four-way movable transport vehicle structure, the top of the second hinge end is provided with a first connecting lug, the top of the side of the second wheel frame away from the second hinge end is provided with a second connecting lug, the elastic element is a spring, one end of the spring is connected to the first connecting lug, and the other end of the spring is connected to the second connecting lug.

[0012] According to the above-described four-way movable transport vehicle structure, the first connecting lug is provided with a first connecting hole, the second connecting lug is provided with a second connecting hole, the horizontal height of the first connecting hole is higher than the horizontal height of the second connecting hole, one end of the spring is connected to the first connecting hole, the other end of the spring is connected to the second connecting hole, and the spring is in a stretched state.

[0013] According to the above-described four-way movable transport vehicle structure, the forks have a first lifting height, the first wheel frame is provided with a first limiting part, and the second wheel frame is provided with a second limiting part. When the forks rise to the first lifting height, the first limiting part can abut against the second limiting part.

[0014] According to the above-described four-way movable transport vehicle structure, the first limiting part is set as a first limiting plate, the second limiting part is set as a second limiting plate, the second limiting plate is located on the end of the second wheel frame that is hinged to the first wheel frame, and the second limiting plate is provided with a limiting groove. When the forks are raised, the first limiting plate can rotate clockwise with the first wheel frame until it extends into the limiting groove and abuts against the second limiting plate.

[0015] The above-described four-way movable pallet truck structure also includes a lifting assembly, which includes a lifting cylinder arranged on the frame. The fork assembly also includes a fork carriage, with two forks symmetrically arranged on the fork carriage. The piston rod of the lifting cylinder is connected to the fork carriage in the vertical direction.

[0016] According to the above-described four-way movable transport vehicle structure, the first wheel frame is also provided with a third hinge end, and the lifting cylinder is connected to the third hinge end through a connecting rod.

[0017] According to the above-described four-directional moving transport vehicle structure, the drive wheel set includes a steering wheel, which is rotatably mounted below the vehicle frame.

[0018] According to the above-described four-way movable transport vehicle structure, the frame assembly further includes an operating handle, the lower end of which is rotatably connected to the frame.

[0019] The present invention has the following beneficial effects:

[0020] 1. The driven wheel set grounding state is automatically switched by the fork height, which can take into account both long-distance forward and backward movement and lateral movement in narrow spaces, avoid interference when turning long goods, and is suitable for handling long goods in narrow spaces;

[0021] 2. The elastic element can drive the second wheel frame to move upward, thereby maintaining the relative position of the second wheel frame and the first wheel frame, thus ensuring that the second driven wheel can remain suspended and will not fall when the forks are below the first preset height;

[0022] 3. Through the cooperation of the first limiting part and the second limiting part, when the first wheel frame rotates clockwise, it can drive the second wheel frame to rotate clockwise as well, thereby lowering the end of the second driven wheel, realizing the height adjustment of the second driven wheel, and restricting the second driven wheel from being suspended in the air, ensuring its support effect;

[0023] 4. The operator can easily control the vehicle's direction of travel and the lifting and lowering of the forks through the operating handle. All functions are integrated into one unit, and the operation is simple and intuitive.

[0024] 5. It adopts symmetrically arranged forks and fork carriages, and is powered by lifting cylinders. The structure is stable, the load-bearing capacity is strong, and it is suitable for handling heavy and long goods. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the embodiment;

[0026] Figure 2 This is a schematic diagram of the assembly of the driven wheel assembly and the forks in an embodiment;

[0027] Figure 3 This is a schematic diagram of the driven wheel assembly structure in an embodiment;

[0028] Figure 4 This is a schematic diagram of the first wheel frame structure in the embodiment.

[0029] In the picture:

[0030] 100. Frame assembly; 110. Frame; 120. Control handle;

[0031] 200. Fork assembly; 210. Fork; 220. Fork carriage;

[0032] 300. Drive assembly; 310. Drive wheel assembly; 311. Steering wheel; 320. Driven wheel assembly; 321. First driven wheel; 322. First wheel frame; 322a. First hinge end; 322b. Second hinge end; 322c. First connecting lug; 322d. First connecting hole; 322e. First limiting plate; 322f. Third hinge end; 323. Second driven wheel; 324. Second wheel frame; 324a. Second connecting lug; 324b. Second connecting hole; 324c. Second limiting plate; 325. Elastic element;

[0033] 400. Lifting assembly; 410. Lifting cylinder; 420. Connecting rod. Detailed Implementation

[0034] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solution of the present invention. However, the invention is not limited to these embodiments.

[0035] like Figure 1-4 As shown, a four-way movable pallet truck structure includes a frame assembly 100, a fork assembly 200, a drive assembly 300, and a lifting assembly 400. In this embodiment, the pallet truck has a first working mode and a second working mode. In the first working mode, the pallet truck can move in the front-to-back direction, and in the second working mode, the pallet truck can move in the left-to-right direction. This facilitates the movement of the pallet truck in narrow spaces when picking up long and narrow goods, and eliminates the problem of long and narrow goods causing interference when the pallet truck turns.

[0036] The frame assembly 100 includes a frame 110 and an operating handle 120. The lower end of the operating handle 120 is rotatably connected to the frame 110. The operating handle 120 is equipped with multiple switches and buttons to control the movement of the lifting assembly 400, thereby controlling the lifting of the fork assembly 200. At the same time, the operating handle 120 can also control the drive assembly 300 to perform corresponding actions.

[0037] The fork assembly 200 includes a fork carriage 220 and two forks 210. The two forks 210 are symmetrically arranged on the fork carriage 220. The fork carriage 220 is vertically mounted on the frame 110. The lifting of the fork carriage 220 can drive the two forks 210 to move up and down synchronously. Using the double forks 210 to pick up goods can improve stability and also improve the stability of the transport vehicle. In this embodiment, both the fork carriage 220 and the forks 210 are made of sheet metal, which can ensure that both have sufficient strength to bear the weight of the goods.

[0038] The lifting assembly 400 includes a lifting cylinder 410, which is arranged on the frame 110. The cylinder is arranged vertically, so its piston rod is connected to the fork carriage 220 in the vertical direction. When the piston rod moves vertically, it can drive the fork carriage 220 to move vertically, thus providing power for the lifting action of the forks 210.

[0039] The drive assembly 300 includes a drive wheel set 310 and two driven wheel sets 320. The drive wheel set 310 is located below the frame 110, and the two driven wheel sets 320 are located at the bottom of the front end of the forks 210, forming a three-point support to improve the stability of the transport vehicle. The drive wheel set 310 determines the direction of travel of the transport vehicle. In this embodiment, the drive wheel set 310 includes a steering wheel 311, which is rotatably mounted below the frame. The steering wheel 311 has two rotation directions: one is vertical rotation, which can drive the entire transport vehicle to move forward; the other is horizontal rotation, which can adjust the direction of travel of the steering wheel 311. The adjustment of its direction of travel can be synchronized with the direction of travel of the driven wheel sets 320.

[0040] In this embodiment, the operating handle 120 is provided with a pinch handle, which can switch between lifting and lowering functions.

[0041] As mentioned above, in a confined space, after a pallet truck picks up goods, if it needs to move them to the side, when the goods are small, the pallet truck can turn to adjust its direction of movement and move them to the side. However, when the goods are large, especially when the length of the goods is much greater than the length of the pallet truck's forks 210, the pallet truck will turn along with the goods, which can easily cause the goods to interfere with other parts or walls in the confined space. Therefore, conventional steerable pallet trucks are not suitable for this working condition.

[0042] Therefore, in this embodiment, the driven wheel assembly 320 includes a first driven wheel 321 and a second driven wheel 323. The first driven wheel 321 is arranged in the front-rear direction of the transport vehicle, and the second driven wheel 323 is arranged in the left-right direction of the transport vehicle. The first driven wheel 321 and the second driven wheel 323 alternately contact the ground. When the first driven wheel 321 contacts the ground, the steering wheel 311 rotates in the same direction as it in the horizontal direction, allowing the transport vehicle to move in the front-rear direction. When the second driven wheel 323 contacts the ground, the steering wheel 311 rotates in the same direction as it in the horizontal direction, allowing the transport vehicle to move in the left-right direction. Therefore, the arrangement of the first driven wheel 321 and the second driven wheel 323 can meet the requirement of bidirectional travel of the transport vehicle without requiring the transport vehicle to turn, making it suitable for transporting long and narrow goods.

[0043] Of course, in order to control the alternating action of the first driven wheel 321 and the second driven wheel 323, the relative position adjustment of the first driven wheel 321 and the second driven wheel 323 is linked to the lifting and lowering of the fork 210. That is, when the fork 210 is in the low position, the first driven wheel 321 is in contact with the ground. At this time, the pallet truck can move in the front and back directions. Since the fork 210 is in the low position, goods can be picked up by moving in the front and back directions. When the fork 210 is in the high position, the second driven wheel 323 is in contact with the bottom surface. At this time, the pallet truck can move laterally in the left and right directions. Since the fork 210 is far away from the bottom surface at this time, it is not easy to interfere with the piles on the ground during the lateral movement. This linkage method is more in line with the usage habits of pallet trucks.

[0044] In this embodiment, the driven wheel assembly 320 further includes an elastic element 325, which is arranged between the first wheel frame 322 and the second wheel frame 324 and is used to pull up the second wheel frame 324 so that the initial height of the second driven wheel 323 is higher than the initial height of the first driven wheel 321.

[0045] Specifically, the first driven wheel 321 is hinged to the bottom of the front end of the fork 210 via the first wheel carrier 322. The first wheel carrier 322 has a first hinge end 322a and a second hinge end 322b. The first hinge end 322a is hinged to the fork 210, and the first driven wheel 321 is located at the second hinge end 322b. The second driven wheel 323 is hinged to the second hinge end 322b via the second wheel carrier 324. The first hinge end 322a is rotatably connected to the fork 210 via a first pivot, and the second hinge end 322b is connected to the first driven wheel 321 and the second wheel carrier 322b via a second pivot. 4. Hinged connection: One end of the second wheel frame 324 is coaxially arranged with the first driven wheel 321. In this embodiment, the first driven wheel 321 is arranged behind the second driven wheel 323. When the fork 210 rises from its lower position, the rise of the fork 210 drives the first hinged end 322a to rise, causing the first wheel frame 322 to rotate clockwise. During this process, the second wheel frame 324 is initially driven upwards and rotates counterclockwise by the elastic element 325 until the first wheel frame 322 and the second wheel frame 324 come into contact. At this point, the fork 210 continues to rise, and the first wheel frame 322 drives the second wheel frame 324 clockwise. As the needle rotates, during the clockwise rotation of the second wheel frame 324, the end of the second wheel frame 324 equipped with the second driven wheel 323 descends, causing the bottom height of the second driven wheel 323 to gradually decrease until it is lower than the bottom height of the first driven wheel 321. At this point, the second driven wheel 323 contacts the ground, while the first driven wheel 321 is suspended in the air, thus achieving the switching from the first driven wheel 321 to the second driven wheel 323. Meanwhile, as the forks 210 descend from their high position, the descent of the forks 210 causes the first hinge end 322a to descend, causing the first wheel frame 322 to rotate counterclockwise. The first wheel frame 322 can drive the second wheel frame 324 to rotate counterclockwise through the elastic element 325, thereby causing the end of the second wheel frame 324 on which the second driven wheel 323 is mounted to rise, and causing the second driven wheel 323 to gradually rise until the bottom height of the second driven wheel 323 is higher than the bottom height of the first driven wheel 321. At this time, the bottom of the first driven wheel 321 abuts against the bottom surface, the second driven wheel 323 is suspended in the air, and the first wheel frame 322 and the second wheel frame 324 are separated, realizing the switching from the second driven wheel 323 to the first driven wheel 321, and realizing the switching between the two working modes of the transport vehicle.

[0046] Furthermore, the top of the second hinge end 322b of the first wheel frame 322 is provided with a first connecting lug 322c, and the top of the side of the second wheel frame 324 away from the second hinge end 322b is provided with a second connecting lug 324a. The elastic element 325 is a spring, one end of which is connected to the first connecting lug 322c, and the other end of which is connected to the second connecting lug 324a. The first connecting lug 322c is provided with a first connecting hole 322d, and the second connecting lug 324a is provided with a second connecting hole 324b. The horizontal height of the first connecting hole 322d is higher than that of the second connecting hole 324b. The spring is at a certain horizontal height, with one end connected to the first connecting hole 322d and the other end connected to the second connecting hole 324b. The spring is in a stretched state. In this embodiment, since the horizontal height of the first connecting hole 322d is higher than that of the second connecting hole 324b, the spring is arranged between the first connecting hole 322d and the second connecting hole 324b, which will cause it to be tilted. As the spring is stretched, it will provide an upward force acting on the second wheel frame 324, realizing the upward pulling effect of the elastic element 325 on the second wheel frame 324, pulling the second wheel frame 324 to rotate counterclockwise.

[0047] Furthermore, to prevent the second wheel carrier 324 from rising excessively, when the second wheel carrier 324 rises to a certain height, the second driven wheel 323 will abut against the bottom of the fork 210. When the fork abuts against the second wheel carrier 324, the bottom of the second driven wheel 323 is higher than the bottom of the first driven wheel 321. The second wheel carrier 324 is driven to rise by a spring, but the fork 210 can limit its maximum height to prevent the second wheel carrier 324 from rising excessively.

[0048] In this embodiment, the fork 210 has an initial height and a first lifting height, wherein the initial height is the lowest height of the fork 210, and the first lifting height is the position where the first wheel frame 322 and the second wheel frame 324 abut when the fork 210 rises.

[0049] Furthermore, in order to achieve the abutment drive between the first wheel frame 322 and the second wheel frame 324, a first limiting part is provided on the first wheel frame 322 and a second limiting part is provided on the second wheel frame 324. When the fork 210 rises to the first lifting height, the first limiting part can abut against the second limiting part. Since the first limiting part rotates clockwise during the lifting process of the fork 210, after it abuts against the second limiting part, the first limiting part drives the second limiting part to rotate clockwise, thereby driving the second wheel frame 324 to rotate clockwise.

[0050] Specifically, the first limiting part is set as the first limiting plate 322e, and the second limiting part is set as the second limiting plate 324c. The second limiting plate 324c is located on the end of the second wheel frame 324 that is hinged to the first wheel frame 322, and the second limiting plate 324c is provided with a limiting groove. When the fork 210 rises, the first limiting plate 322e can rotate clockwise with the first wheel frame 322 until it extends into the limiting groove and abuts against the second limiting plate 324c.

[0051] Of course, in this embodiment, the first wheel frame 322 is also provided with a third hinge end 322f. The lifting cylinder 410 is connected to the third hinge end through the connecting rod 420. The third hinge end 322f and the first hinge end 322a are located at the same end of the first wheel frame 322. That is, during the operation of the lifting cylinder 410, the connecting rod 420 provides power for the rotation of the first wheel frame 322, while the hinge point between the first hinge end 322a and the fork 210 serves as the support point for the rotation of the first wheel frame 322.

[0052] In this embodiment, a four-way movable transport vehicle structure is disclosed, including a frame assembly 100, a fork assembly 200, and a drive assembly 300. The frame assembly 100 includes a frame 110, the fork assembly 200 includes forks 210 that are vertically and flexibly mounted on the front side of the frame 110, and the drive assembly 300 includes a drive wheel assembly 310 located at the bottom of the frame 110 and a driven wheel assembly 320 located at the bottom of the front end of the forks 210. The core improvement of this invention lies in the driven wheel assembly 320: it is connected by a first driven wheel 310. The unique hinge design of the first driven wheel 321 (rolling direction along front and back) and the second driven wheel 323 (rolling direction along left and right) allows the two driven wheels to automatically alternately contact the ground when the forks 210 are raised or lowered. When the forks 210 are lowered, the first driven wheel 321 touches the ground, facilitating the vehicle's forward and backward movement; when the forks 210 are raised, the second driven wheel 323 touches the ground, facilitating the vehicle's lateral movement. This effectively solves the technical problem of long and narrow goods being difficult to turn and prone to interference in narrow spaces, significantly improving the flexibility and efficiency of handling.

[0053] The technical solution of the present invention has been described in detail above with reference to the accompanying drawings. The described embodiments are used to help understand the concept of the present invention. The specific embodiments described herein are merely illustrative examples of the spirit of the present invention. Those skilled in the art to which this invention pertains can make various modifications or additions to the described specific embodiments or use similar methods to replace them, but without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0054] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0055] Furthermore, in this invention, descriptions involving terms such as "first," "second," and "a" are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0056] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

Claims

1. A four-way movable pallet truck structure, comprising a frame assembly, a fork assembly, and a drive assembly, wherein the frame assembly includes a frame, the fork assembly includes liftable forks mounted on the front side of the frame, and the drive assembly includes a drive wheel assembly located at the bottom of the frame and a driven wheel assembly located at the bottom of the front end of the forks, characterized in that, The driven wheel assembly includes: A first driven wheel is hinged to the bottom of the front end of the fork via a first wheel carrier. The first wheel carrier has a first hinge end and a second hinge end. The first hinge end is hinged to the fork. The first driven wheel is arranged at the second hinge end, and the rolling direction of the first driven wheel is arranged along the front-rear direction of the transport vehicle. The second driven wheel is hinged to the second hinge end via the second wheel frame, and the rolling direction of the second driven wheel is arranged along the left and right direction of the transport vehicle; An elastic element is arranged between the first wheel frame and the second wheel frame and is used to pull up the second wheel frame so that the initial height of the second driven wheel is higher than the initial height of the first driven wheel; When the forks rise, the forks can drive the first wheel carrier to rotate clockwise and abut against the second wheel carrier. When the forks continue to rise, the second wheel carrier can rotate clockwise with the first wheel carrier, causing the end of the second wheel carrier on which the second driven wheel is mounted to descend, and making the bottom height of the second driven wheel lower than the bottom height of the first driven wheel. When the forks descend, the forks can drive the first wheel carrier to rotate counterclockwise, and through the elastic element, drive the second wheel carrier to rotate counterclockwise, causing the end of the second wheel carrier on which the second driven wheel is mounted to rise, and making the bottom height of the second driven wheel higher than the bottom height of the first driven wheel.

2. The four-way movable transport vehicle structure according to claim 1, characterized in that, The second hinge end is provided with a first connecting lug at its top, and the second wheel frame is provided with a second connecting lug at its top on the side away from the second hinge end. The elastic element is a spring, one end of which is connected to the first connecting lug, and the other end of which is connected to the second connecting lug.

3. The four-way movable transport vehicle structure according to claim 2, characterized in that, The first connecting lug has a first connecting hole, and the second connecting lug has a second connecting hole. The horizontal height of the first connecting hole is higher than that of the second connecting hole. One end of the spring is connected to the first connecting hole, and the other end of the spring is connected to the second connecting hole. The spring is in a stretched state.

4. The four-way movable transport vehicle structure according to claim 1, characterized in that, The forks have a first lifting height, the first wheel frame is provided with a first limiting part, and the second wheel frame is provided with a second limiting part. When the forks rise to the first lifting height, the first limiting part can abut against the second limiting part.

5. A four-way movable transport vehicle structure according to claim 4, characterized in that, The first limiting part is configured as a first limiting plate, and the second limiting part is configured as a second limiting plate. The second limiting plate is located on the end of the second wheel frame that is hinged to the first wheel frame, and the second limiting plate is provided with a limiting groove. When the forks rise, the first limiting plate can rotate clockwise with the first wheel frame until it extends into the limiting groove and abuts against the second limiting plate.

6. The four-way movable transport vehicle structure according to claim 1, characterized in that, It also includes a lifting assembly, which includes a lifting cylinder arranged on the frame. The fork assembly also includes a fork carriage, with two forks symmetrically arranged on the fork carriage. The piston rod of the lifting cylinder is connected to the fork carriage in the vertical direction.

7. A four-way movable transport vehicle structure according to claim 6, characterized in that, The first wheel frame is also provided with a third hinge end, and the lifting cylinder is connected to the third hinge end through a connecting rod.

8. A four-way movable transport vehicle structure according to claim 1, characterized in that, The drive wheel assembly includes a large steering wheel, which is rotatably mounted below the vehicle frame.

9. A four-way movable transport vehicle structure according to claim 1, characterized in that, The frame assembly also includes an operating handle, the lower end of which is rotatably connected to the frame.

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