Carrying vehicle shaped like Chinese character'tian '

Abstract

The utility model discloses a Chinese character'tian '-shaped carrier which comprises a rear frame, a left frame, a right frame, a left frame and a right frame. The front frame is arranged on the front portion of the rear frame in a sliding mode and can move in the vertical direction relative to the rear frame, and a left fork leg and a right fork leg which are horizontally arranged are fixedly arranged on a bottom plate of the front frame; the lifting mechanism is arranged on the rear frame; the two connecting rod mechanisms are hinged to the lower portions of the left fork leg and the right fork leg respectively, the rear ends of the connecting rod mechanisms are arranged on the limiting parts on the corresponding sides of the rear frame in a limiting mode, and bearing wheel assemblies are hinged to the front ends of the connecting rod mechanisms; the two directional wheel sets are mounted on the left side and the right side of the upper bottom plate of the front frame respectively; the lifting mechanism is used for driving the front frame to move in the vertical direction relative to the rear frame, and the fork legs on the front frame can drive the bearing wheel assemblies to make contact with the ground or leave the ground to be stored in the fork legs through the connecting rod mechanism. According to the scheme, the carrying of the matts can be realized by the carrying vehicle for the matts.

Description

Technical Field

[0001] The utility model relates to the technology of handling a cross-shaped pallet, in particular to a cross-shaped pallet handling vehicle. Background Art

[0002] A pallet is a horizontal platform device used for containerizing, stacking, handling, and transporting goods and products as unit loads. As an important loading, unloading, storage, and transportation equipment in the logistics operation process, the pallet plays a huge role in modern logistics when used in conjunction with a forklift. A cross-shaped pallet is a type of pallet. Compared with other types of pallets of the same size, it is lighter in its own weight. Also, because the cross-shaped structure connects all the feet, its structure is more stable, which can make the pressure of the goods distributed more evenly, not easily deformed, and has a better load-bearing capacity.

[0003] However, since the bottom of the cross-shaped pallet is provided with reinforcing ribs, when using a pallet handling vehicle or a pallet handling AGV to handle the cross-shaped pallet, it is inevitable to encounter the situation of inserting the fork from the side of the cross-shaped pallet with ribs. The reinforcing ribs on the cross-shaped pallet will obstruct the fork legs of the handling vehicle, making the fork legs unable to be inserted into the jacks of the cross-shaped pallet. If an ordinary pallet handling vehicle or a pallet handling AGV forcibly inserts the fork from the side of the cross-shaped pallet with ribs at this time, it is easy to cause situations such as the displacement of the cross-shaped pallet and inaccurate positioning. If a forklift is used to handle the cross-shaped pallet, it will lead to increased costs, reduced efficiency, or an increase in the required channel width. Content of the Utility Model

[0004] In order to solve the above technical problems, the purpose of the utility model is to provide a cross-shaped pallet handling vehicle that can lift the fork legs off the ground and extend them into the cross-shaped pallet, so as to realize the handling of the cross-shaped pallet.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A cross-shaped pallet handling vehicle, comprising:

[0007] A rear frame, with a limiting part respectively arranged on the left and right sides of its bottom;

[0008] A front frame, slidably arranged at the front part of the rear frame and capable of moving relative to the rear frame in the vertical direction. On the bottom plate of the front frame, two horizontally arranged fork legs are fixedly provided;

[0009] A lifting mechanism, arranged on the rear frame;

[0010] Two link mechanisms, respectively hinged under the left and right fork legs. The rear ends of the link mechanisms are limited and arranged at the corresponding limiting parts on the rear frame, and the front ends of the link mechanisms are hinged with load-bearing wheel assemblies;

[0011] Two sets of directional wheels, which are respectively installed on the left and right sides of the upper bottom plate of the front frame;

[0012] The lifting mechanism is used to drive the front frame to move vertically relative to the rear frame. The fork legs on the front frame can drive the load-bearing wheel assembly to contact the ground or leave the ground and retract into the fork legs through the linkage mechanism.

[0013] In this way, in the initial state, the load-bearing wheel assembly at the front end of the linkage mechanism is retracted into the fork legs. The directional wheel sets contact the ground to support the fork legs and prevent the fork legs from tilting forward. The fork legs of the cross-shaped pallet truck extend into the insertion holes of the cross-shaped pallet and penetrate the cross-shaped pallet. When lifting the load, the lifting mechanism provides power to drive the front frame to move upward vertically relative to the rear frame, and the fork legs also move upward. The fork legs drive the load-bearing wheel assembly to move downward through the linkage mechanism to contact the ground. At this time, the cross-shaped pallet is lifted off the ground, and the cross-shaped pallet truck is used to carry the cross-shaped pallet. When lowering and placing the cross-shaped pallet, the lifting mechanism provides power to drive the front frame to move downward vertically relative to the rear frame, and the fork legs move downward. The fork legs drive the load-bearing wheel assembly to move upward through the linkage mechanism. The load-bearing wheel assembly retracts into the fork legs and leaves the ground. At this time, the fork legs of the cross-shaped pallet truck can be separated from the insertion holes of the cross-shaped pallet to complete the handling of the cross-shaped pallet.

[0014] Preferably, the front frame includes a rear enclosure, a bottom plate and a front enclosure. The rear enclosure, the bottom plate and the front enclosure enclose a space for setting the battery, and the rear enclosure can slide vertically relative to the rear frame.

[0015] Preferably, the linkage mechanism sequentially includes a first link, a second link, a third link and a load-bearing wheel assembly from back to front. The rear end of the first link is arranged at the limiting part on the corresponding side of the rear frame. The front part of the first link is hinged to the rear part of the fork leg. The front part of the first link is hinged to the rear part of the second link. The front part of the second link is hinged to the rear part of the third link. The rear part of the third link is hinged to the front part of the fork leg. The load-bearing wheel assembly is hinged to the front end of the third link.

[0016] Preferably, the front part of the first link and the rear part of the fork leg are hinged through a first pin shaft. The front part of the first link and the rear part of the second link are hinged through a second pin shaft. The front part of the second link and the rear part of the third link are hinged through a third pin shaft. The rear part of the third link and the front part of the fork leg are hinged through a fourth pin shaft. The first pin shaft is located below and behind the second pin shaft. The third pin shaft is located below and in front of the fourth pin shaft.

[0017] Preferably, the first link includes two brackets, a sixth pin shaft and a first roller. The brackets are arranged in an L shape. The rear ends of the two brackets are fixedly connected through the sixth pin shaft. The first roller is sleeved on the sixth pin shaft.

[0018] Preferably, the limiting part includes a first limiting plate, a second limiting plate and a third limiting plate. The rear end of the first limiting plate is fixedly connected to the front frame. The upper end of the second limiting plate is fixedly connected to the rear end of the first limiting plate. The rear end of the third limiting plate is fixedly connected to the lower end of the second limiting plate. A limiting opening is formed among the first limiting plate, the second limiting plate and the third limiting plate. The rear end of the bracket extends into the limiting opening, and the front end of the third limiting plate extends between the two brackets.

[0019] Preferably, the second connecting rod includes a long rod. The rear end of the long rod is hinged to the second pin shaft through two rear connecting plates. The front end of the long rod is hinged to the third pin shaft through two front connecting plates. A second roller is also sleeved on the third pin shaft, and the bottom surface of the second roller is located below the bottom surface of the front connecting plate.

[0020] Preferably, the third connecting rod includes a wheel frame intermediate plate. The rear end of the wheel frame intermediate plate is hinged to the fourth pin shaft through two wheel frame rear plates. The front end of the wheel frame intermediate plate extends forward with two wheel frame front plates. The two wheel frame front plates are respectively located on the left and right sides of the load-bearing wheel assembly and are hinged to the load-bearing wheel assembly through a fifth pin shaft. At least one load-bearing wheel is provided on the load-bearing wheel assembly.

[0021] Preferably, the lifting mechanism is two lifting oil cylinders. The two lifting oil cylinders are vertically arranged on the left and right sides of the rear frame. The piston on the lifting oil cylinder is fixedly connected to the front frame so as to be able to drive the front frame to move relative to the rear frame in the vertical direction.

[0022] Preferably, the two fork legs are fixedly connected through a third connecting plate, so as to ensure that the two fork legs can rise or fall synchronously, ensure the parallelism of the two fork legs, and reduce the tendency of the fork leg ends to expand outwards when carrying a load.

[0023] Due to the adoption of the above technical solutions, the present utility model has the following beneficial effects: In the present utility model, when the load-bearing wheel assembly leaves the ground, the fork legs are supported by setting the directional wheel group to prevent the fork legs from tilting forward so that the load-bearing wheel assembly cannot be lifted into the air; by setting the connecting rod mechanism, the load-bearing wheel assembly is driven to move upwards to be received into the fork legs and leave the ground, or the load-bearing wheel assembly is driven to move downwards to contact the ground to support the fork legs. Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of the present utility model and the cross-shaped support;

[0025] Figure 2 is a schematic structural diagram of the present utility model after removing the front apron;

[0026] Figure 3 is a schematic structural diagram of the present utility model after removing the front apron and the side plates;

[0027] Figure 4 It is a schematic diagram of the connection structure of two straddle legs;

[0028] Figure 5 It is a schematic diagram of the structure of the linkage mechanism arranged inside the straddle legs;

[0029] Figure 6 is Figure 5 A schematic diagram of the structure from another angle;

[0030] Figure 7 It is a schematic diagram of the linkage mechanism.

[0031] Reference numerals:

[0032] 10, cross-shaped support; 101, jack; 1, rear frame; 11, limiting part; 111, first limiting plate; 112, second limiting plate; 113, third limiting plate; 114, limiting opening; 12, guide rail; 13, side plate; 21, straddle leg; 22, rear enclosure; 23, bottom plate; 24, front enclosure; 3, lifting mechanism; 4, linkage mechanism; 41, first connecting rod; 411, bracket; 412, sixth pin shaft; 413, first roller; 42, second connecting rod; 421, long rod; 422, rear connecting plate; 423, front connecting plate; 424, second roller; 43, third connecting rod; 431, middle plate of wheel frame; 432, rear plate of wheel frame; 433, front plate of wheel frame; 44, load-bearing wheel assembly; 45, first pin shaft; 46, second pin shaft; 47, third pin shaft; 48, fourth pin shaft; 49, fifth pin shaft; 5, directional wheel set; 6, third connecting plate. Detailed implementation manners

[0033] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0034] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more, unless otherwise clearly defined.

[0036] In the present utility model, unless otherwise clearly specified and defined, the terms such as "mounted", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0037] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "under" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal height than the second feature.

[0038] For the sake of clear description, in the present utility model, the direction in which the pallet truck is inserted into the pallet is defined as the front, and vice versa as the rear.

[0039] As Figures 1 to 7 shown, a pallet truck includes:

[0040] A rear frame 1, with a limiting part 11 respectively arranged on the left and right sides of its bottom;

[0041] A front frame 2, slidably arranged at the front part of the rear frame and capable of moving relative to the rear frame in the vertical direction. On the bottom plate 23 of the front frame, two horizontally arranged fork legs 21 are fixedly provided;

[0042] A lifting mechanism 3, arranged on the rear frame;

[0043] Two link mechanisms 4, respectively hinged below the left and right fork legs 21. The rear end of the link mechanism 4 is limitedly arranged at the corresponding limiting part 11 on the rear frame, and the front end of the link mechanism 4 is hinged with a load-bearing wheel assembly 44;

[0044] Two directional wheel sets 5, and the two directional wheel sets 5 are respectively installed on the left and right sides of the upper bottom plate 23 of the front frame;

[0045] The lifting mechanism 3 is used to drive the front frame to move relative to the rear frame in the vertical direction. The fork legs 21 on the front frame can drive the load-bearing wheel assembly 44 to contact the ground or leave the ground and retract into the fork legs 21 through the link mechanism 4.

[0046] In the present utility model, by arranging the link mechanism 4 hinged to the fork legs 21, the load-bearing wheel assembly 44 is driven to retract into the fork legs 21 to make the front end of the fork legs 21 in the air, or the load-bearing wheel assembly 44 is driven to descend, so as to fork up the cross-shaped pallet 10 and carry the cross-shaped pallet 10.

[0047] Moreover, in the present utility model, by arranging two left and right directional wheel sets 5, when the load-bearing wheel assembly 44 retracts into the fork legs 21 and the front end of the fork legs 21 is in the air, the fork legs 21 are supported to prevent the fork legs 21 from tilting forward, so that the load-bearing wheel assembly 44 cannot be inserted into the insertion hole 101 of the cross-shaped pallet 10 in the air.

[0048] The front frame includes a rear enclosure 22, a bottom plate 23 and a front enclosure 24. The rear enclosure 22, the bottom plate 23 and the front enclosure 24 enclose a space for arranging the battery, and the rear enclosure 22 can slide relative to the rear frame in the vertical direction.

[0049] Specifically, the lifting mechanism 3 is two lifting cylinders or a screw motor and other power-providing devices. In the present utility model, the lifting mechanism 3 is a lifting cylinder. The two lifting cylinders are vertically arranged on the left and right sides of the rear frame. The piston on the lifting cylinder is fixedly connected to the front frame so as to be able to drive the front frame to move relative to the rear frame in the vertical direction. Sliders are arranged on the left and right sides of the rear enclosure 22, and a guide rail 12 is arranged on the front side of the rear frame. The rear enclosure 22 slides vertically along the guide rail 12 of the rear frame through the sliders.

[0050] The link mechanism 4 successively includes a first link 41, a second link 42, a third link 43 and a load-bearing wheel assembly 44 from back to front. The rear end of the first link 41 is arranged at the limiting part 11 on the corresponding side of the rear frame. The front part of the first link 41 is hinged to the rear part of the fork legs 21. The front part of the first link 41 is hinged to the rear part of the second link 42. The front part of the second link 42 is hinged to the rear part of the third link 43. The rear part of the third link 43 is hinged to the front part of the fork legs 21. The load-bearing wheel assembly 44 is hinged to the front end of the third link 43.

[0051] Specifically, as Figures 5 to 7As shown in the figure, the front part of the first connecting rod 41 is hinged to the rear part of the fork leg 21 through a first pin shaft 45, the front part of the first connecting rod 41 is hinged to the rear part of the second connecting rod 42 through a second pin shaft 46, the front part of the second connecting rod 42 is hinged to the rear part of the third connecting rod 43 through a third pin shaft 47, and the rear part of the third connecting rod 43 is hinged to the front part of the fork leg 21 through a fourth pin shaft 48; the first pin shaft 45 is located below and behind the second pin shaft 46; the third pin shaft 47 is located below and in front of the fourth pin shaft 48.

[0052] As Figure 7 shown, specifically, the first connecting rod 41 includes two brackets 411, a sixth pin shaft 412 and a first roller 413. The brackets 411 are arranged in an L shape. The rear ends of the two brackets 411 are fixedly connected through the sixth pin shaft 412, and the first roller 413 is sleeved on the sixth pin shaft 412.

[0053] In the present utility model, as Figure 3 shown, the limiting part 11 includes a first limiting plate 111, a second limiting plate 112 and a third limiting plate 113. The rear end of the first limiting plate 111 is fixedly connected to the front vehicle frame. The upper end of the second limiting plate 112 is fixedly connected to the rear end of the first limiting plate 111. The rear end of the third limiting plate 113 is fixedly connected to the lower end of the second limiting plate 112. A limiting opening 114 is formed among the first limiting plate 111, the second limiting plate 112 and the third limiting plate 113. The rear end of the bracket 411 extends into the limiting opening 114, and the front end of the third limiting plate 113 extends between the two brackets 411. In this way, during the process of lifting the front vehicle frame and the fork leg 21, the rear end of the first connecting rod 41 is always restricted within the limiting opening 114. The first roller 413 of the first connecting rod 41 presses against the third limiting plate 113 and causes the front end of the first connecting rod 41 to rotate counterclockwise around the first roller 413, thereby giving the second connecting rod 42 a tendency to move backward. In the present utility model, the lower ends of the two lifting cylinders are respectively installed on the first limiting plates 111 of the left and right limiting parts 11.

[0054] In the present utility model, the second connecting rod 42 includes a long rod 421. The rear end of the long rod 421 is hinged to the second pin shaft 46 through two rear connecting plates 422, and the front end of the long rod 421 is hinged to the third pin shaft 47 through two front connecting plates 423. A second roller 424 is also sleeved on the third pin shaft 47, and the bottom surface of the second roller 424 is located below the bottom surface of the front connecting plate 423. The two rear connecting plates 422 are arranged on the left and right sides of the rear end of the long rod 421 and are fixedly connected or integrally formed with the long rod 421. The two front connecting plates 423 are arranged on the left and right sides of the front end of the long rod 421 and are fixedly connected or integrally formed with the long rod 421.

[0055] In the present utility model, the third connecting rod 43 includes a wheel carrier intermediate plate 431. The rear end of the wheel carrier intermediate plate 431 is hinged to a fourth pin shaft 48 through two wheel carrier rear plates 432. The fourth pin shaft 48 is located above the front connecting plate 423 of the long rod. The front end of the wheel carrier intermediate plate 431 extends forward two wheel carrier front plates 433. The two wheel carrier front plates 433 are respectively located on the left and right sides of the load-carrying wheel assembly 44 and are hinged to the load-carrying wheel assembly 44 through a fifth pin shaft 49. At least one load-carrying wheel is provided on the load-carrying wheel assembly 44.

[0056] In order to ensure that the two fork legs 21 can be lifted and lowered synchronously, in the present utility model, the two fork legs 21 are fixedly connected through a third connecting plate 6 to ensure the parallelism of the two fork legs and reduce the tendency of the ends of the fork legs to expand outward when carrying a load.

[0057] The using process of the cross-shaped pallet truck in the present utility model is as follows:

[0058] 1. In the initial state, the front frame is at the lowest point. The directional wheels in the directional wheel set 5 are in contact with the ground to support the fork legs 21. The load-carrying wheel assembly 44 at the front end of the link mechanism is received in the fork legs 21. The front ends of the fork legs 21 are suspended in the air. The fork legs 21 of the cross-shaped pallet truck can extend into the insertion holes 101 of the cross-shaped pallet 10 and penetrate through the cross-shaped pallet 10.

[0059] 2. When lifting and carrying a load, the lifting mechanism 3 provides power to drive the front frame to move upward in the vertical direction relative to the rear frame 1, driving the fork legs 21 to move upward. The first pin shaft 45 and the fourth pin shaft 48 move upward. Since the first roller 413 of the first connecting rod 41 supports on the third limiting plate 113 of the rear frame 1 and the rear end of the first connecting rod 41 is restricted in the limiting opening 114, therefore, the front end of the first connecting rod 41 rotates counterclockwise around the first roller 413, thereby giving the second connecting rod 42 a tendency to move backward, so that the rear end of the third connecting rod 43 rotates clockwise with the fourth pin shaft 48 as the axis, thereby driving the load-carrying wheel assembly 44 to move downward. The load-carrying wheels of the load-carrying wheel group 44 support on the ground, and the directional wheels of the directional wheel set 5 leave the ground and are suspended in the air. At this time, the cross-shaped pallet 10 is lifted off the ground by the fork legs 21, and the cross-shaped pallet truck in the present invention is used to carry the cross-shaped pallet 10.

[0060] 3. When the cross-shaped carrier 10 is placed downward, the lifting mechanism 3 provides power to drive the front vehicle frame to move downward relative to the rear vehicle frame 1 in the vertical direction, driving the fork legs 21 to move downward. The first pin shaft 45 and the fourth pin shaft 48 move downward. Since the first roller 413 of the first connecting rod 41 supports on the third limiting plate 113 of the rear vehicle frame 1 and the rear end of the first connecting rod 41 is restricted within the limiting opening 114, the front end of the first connecting rod 41 rotates clockwise around the first roller 413, thus giving the second connecting rod 42 a tendency to move forward, so that the rear end of the third connecting rod 43 rotates counterclockwise with the fourth pin shaft 48 as the axis, driving the load-bearing wheel assembly 44 to move upward. The load-bearing wheel assembly 44 is retracted into the fork legs 21, and the front end of the fork legs 21 is in the air. The directional wheels of the directional wheel set 5 contact the ground to support the fork legs 21. At this time, the fork legs 21 of the cross-shaped carrier truck can be separated from the insertion holes 101 of the cross-shaped carrier 10, completing the handling of the cross-shaped carrier 10.

[0061] All the features described in the specification, the appended claims and the drawings, whether alone or in any combination thereof, are important features of the present utility model.

[0062] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "one implementation manner", "specific implementation manner", "other implementation manners", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment, implementation manner or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described above can also be combined in a suitable manner in any one or more embodiments, implementation manners or examples. The technical solutions described in the present utility model also include the technical solutions formed by any one or more of the above-described specific features, structures, materials or characteristics alone or in combination.

[0063] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Without departing from the principles and purposes of the present utility model, those of ordinary skill in the art can make changes, modifications, substitutions, variations, delete some features, add features or re-combine features to the above embodiments within the scope of the present utility model. Any simple modification, equivalent change and modification made to the above embodiments based on the innovative principles of the present utility model still fall within the scope of the technical solutions of the present utility model.

Claims

1. A field-shaped transport vehicle, characterized in that: include: The rear frame has a limit portion (11) provided on the left and right sides of the bottom thereof; A front frame is slidably arranged in front of the rear frame and is movable in a vertical direction relative to the rear frame, and two left and right horizontally arranged fork legs (21) are fixedly arranged on a bottom plate (23) of the front frame; A lifting mechanism (3) is arranged on the rear frame; Two connecting rod mechanisms (4) are respectively hinged below the left and right fork legs (21); a rear end limiter of the connecting rod mechanism (4) is arranged at a limiter portion (11) on a corresponding side of the rear frame; and a front end of the connecting rod mechanism (4) is hingedly connected to a load-bearing wheel assembly (44); Two directional wheel assemblies (5), the two directional wheel assemblies (5) being respectively mounted on the left and right sides of the upper bottom plate (23) of the front frame; The lifting mechanism (3) is used to drive the front frame to move in a vertical direction relative to the rear frame, and the fork leg (21) on the front frame can drive the load-bearing wheel assembly (44) to contact the ground or leave the ground and be retracted into the fork leg (21) through the connecting rod mechanism (4).

2. A field-shaped transport vehicle according to claim 1, characterized in that: The front vehicle frame comprises a rear panel (22), a bottom panel (23) and a front panel (24); the rear panel (22), the bottom panel (23) and the front panel (24) together form a space for arranging a battery; the rear panel (22) can slide in a vertical direction relative to the rear vehicle frame.

3. The field-shaped transport vehicle according to claim 1, characterized in that: The link mechanism (4) comprises, from rear to front, a first link (41), a second link (42), a third link (43) and a load-bearing wheel assembly (44); the rear end of the first link (41) is arranged at a limiting portion (11) on a corresponding side of the rear frame; the front portion of the first link (41) is hinged to the rear portion of a fork leg (21); the front portion of the first link (41) is hinged to the rear portion of the second link (42); the front portion of the second link (42) is hinged to the rear portion of the third link (43); the rear portion of the third link (43) is hinged to the front portion of the fork leg (21); and the load-bearing wheel assembly (44) is hinged to the front end of the third link (43).

4. A field-shaped transport vehicle according to claim 3, characterized in that: The front part of the first link (41) is hinged to the rear part of the fork leg (21) via a first pin shaft (45), the front part of the first link (41) is hinged to the rear part of the second link (42) via a second pin shaft (46), the front part of the second link (42) is hinged to the rear part of the third link (43) via a third pin shaft (47), and the rear part of the third link (43) is hinged to the front part of the fork leg (21) via a fourth pin shaft (48); the first pin shaft (45) is located below the second pin shaft (46) and at the rear side of the second pin shaft (46); the third pin shaft (47) is located below the fourth pin shaft (48) and at the front side of the fourth pin shaft (48).

5. The field-shaped transport vehicle according to claim 3, characterized in that: The first connecting rod (41) comprises two brackets (411), a sixth pin shaft (412) and a first roller (413); the brackets (411) are arranged in an L-shape; the rear ends of the two brackets (411) are fixedly connected via the sixth pin shaft (412); and the first roller (413) is sleeved on the sixth pin shaft (412).

6. The field-shaped transport vehicle according to claim 5, characterized in that: The limiting portion (11) comprises a first limiting plate (111), a second limiting plate (112) and a third limiting plate (113); the rear end of the first limiting plate (111) is fixedly connected to the front frame; the upper end of the second limiting plate (112) is fixedly connected to the rear end of the first limiting plate (111); the rear end of the third limiting plate (113) is fixedly connected to the lower end of the second limiting plate (112); a limiting opening (114) is formed between the first limiting plate (111), the second limiting plate (112) and the third limiting plate (113); the rear end of the bracket (411) extends into the limiting opening (114); and the front end of the third limiting plate (113) extends between the two brackets (411).

7. The field-shaped transport vehicle according to claim 3, characterized in that: The second connecting rod (42) comprises a long rod (421), the rear end of the long rod (421) being hinged to the second pin shaft (46) via two rear connecting plates (422), the front end of the long rod (421) being hinged to the third pin shaft (47) via two front connecting plates (423), a second roller (424) being sleeved on the third pin shaft (47), the bottom surface of the second roller (424) being located below the bottom surface of the front connecting plate (423).

8. The field-shaped transport vehicle according to claim 3, characterized in that: The third connecting rod (43) comprises a wheel frame middle plate (431), the rear end of the wheel frame middle plate (431) is hinged to a fourth pin shaft (48) via two wheel frame rear plates (432), the front end of the wheel frame middle plate (431) extends forward to two wheel frame front plates (433), the two wheel frame front plates (433) are respectively located on the left and right sides of the load-bearing wheel assembly (44) and are hinged to the load-bearing wheel assembly (44) via a fifth pin shaft (49), and at least one load-bearing wheel is provided on the load-bearing wheel assembly (44).

9. The field-shaped transport vehicle according to claim 1, characterized in that: The lifting mechanism (3) is two lifting cylinders, which are vertically arranged on the left and right sides of the rear frame. The pistons on the lifting cylinders are fixedly connected to the front frame so as to drive the front frame to move in the vertical direction relative to the rear frame.

10. The cross-legged transport vehicle according to claim 1, characterized in that: The two fork legs (21) are fixedly connected via a third connecting plate (6).

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