Pallet truck for carrying pallets

Abstract

The utility model relates to a pallet truck for carrying pallets. The pallet truck comprises a truck body assembly, a pallet fork assembly and a bearing wheel lifting assembly. The vehicle body assembly can walk along the working face. The pallet fork assembly comprises a pallet fork extending horizontally, and the pallet fork can be connected with the vehicle body assembly in a lifting mode relative to the vehicle body assembly. The bearing wheel lifting assembly comprises a push-pull rod which can be connected with the pallet fork in a manner of translating relative to the pallet fork and is located below the pallet fork, a bearing wheel seat hinged to the first end of the push-pull rod, and a bearing wheel hinged to the bearing wheel seat. When the pallet fork drives the push-pull rod to synchronously move upwards relative to the vehicle body assembly, the push-pull rod can translate in the first direction relative to the pallet fork, and the bearing wheel seat can drive the bearing wheel to rotate downwards and fall onto the working face. When the pallet fork drives the push-pull rod to synchronously move downwards relative to the vehicle body assembly, the push-pull rod can horizontally move in the second direction opposite to the first direction relative to the pallet fork, and the bearing wheel base can drive the bearing wheel to rotate upwards to be separated from the working face so as not to make contact with a lateral hole when stretching into and stretching out of the lateral hole of the Chinese character'tian '-shaped tray.

Description

Technical Field

[0001] The utility model relates to the technical field of pallet trucks, in particular to a pallet truck for transporting pallets. Background Art

[0002] The top of the Tianzi pallet is flat and used to carry goods. There are through holes in the bottom and side walls of the Tianzi pallet. A forklift is inserted into the side holes of the Tianzi pallet to lift and move the Tianzi pallet and the goods it carries.

[0003] Traditional forklifts include pallet trucks, counterbalanced forklifts, and reach trucks. Among them, the pallet truck's fork is equipped with load-bearing wheels at the bottom. When the fork is inserted into the side hole of the cross-section pallet, the load-bearing wheels at the bottom of the fork are likely to contact the bottom of the side hole, causing damage to the pallet or pushing the pallet forward. This can also cause the pallet truck to be shaken or the load-bearing wheels to be damaged. Counterbalanced forklifts and reach trucks do not have load-bearing wheels at the bottom of the fork. In order to counterbalance the cargo carried by the fork, their body size and weight are both large. This type of forklift is expensive and has a large turning radius, making it less adaptable to small sites and narrow aisles. Utility Model Content

[0004] (1) Technical issues to be resolved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a pallet truck for transporting pallets, which solves the technical problems that when the fork body of a traditional pallet truck is inserted into the side hole of the cross-shaped pallet, the load-bearing wheels at the bottom of the fork body are easily in contact with the bottom of the side hole, and that counterbalanced forklifts and reach forklifts are expensive and cannot adapt to smaller application scenarios.

[0006] (2) Technical solution

[0007] In order to achieve the above-mentioned purpose, the main technical solutions adopted by this utility model include:

[0008] The embodiment of the utility model provides a pallet truck for transporting pallets, comprising a vehicle body assembly, a fork assembly and a load-bearing wheel lifting assembly;

[0009] The vehicle body assembly is capable of traveling along a working surface; the fork assembly includes a horizontally extending fork, the fork being connected to the vehicle body assembly so as to be lifted relative to the vehicle body assembly; the load-bearing wheel lifting mechanism includes a push-pull rod connected to the fork assembly so as to be movably relative to the fork and located below the fork, a load-bearing wheel seat hingedly connected to a first end of the push-pull rod, and the load-bearing wheel hingedly connected to the load-bearing wheel seat;

[0010] When the fork drives the push-pull rod to move upward synchronously relative to the vehicle body assembly, the push-pull rod can translate in a first direction relative to the fork, and the load-bearing wheel seat can drive the load-bearing wheel to rotate downward and fall onto the working surface;

[0011] When the fork drives the push-pull rod to move upward relative to the vehicle body assembly, the roller can roll upward along the inclined surface, and the push-pull rod can move in the first direction relative to the fork.

[0012] According to the utility model, the second end of the push-pull rod is hingedly connected with a roller, the roller can roll on an inclined surface on the vehicle body assembly, and the upper end of the inclined surface is inclined towards the fork;

[0013] When the fork drives the push-pull rod to move upward relative to the vehicle body assembly, the roller can roll upward along the inclined surface, and the push-pull rod can move in the first direction relative to the fork.

[0014] When the fork drives the push-pull rod to move downward relative to the vehicle body assembly, the roller can roll downward along the inclined surface, and the push-pull rod can move in the second direction relative to the fork.

[0015] According to the utility model, the first end of the push-pull rod is hingedly connected with the bearing wheel seat in a rotating manner about a horizontal axis, and the bearing wheel seat is hingedly connected with the fork in a rotating manner about a horizontal axis.

[0016] The second end of the push-pull rod is also hingedly connected with a hinged seat in a rotating manner about a horizontal axis, and the hinged seat is hingedly connected with the fork in a rotating manner about a horizontal axis.

[0017] According to the utility model, the bearing wheel seat and the first supporting lug on the fork are hingedly connected through a first horizontal shaft.

[0018] The second end of the push-pull rod is fixedly connected with a connecting seat, the connecting seat is hingedly connected with the hinged seat and the roller in a rotating manner about a horizontal axis, and the hinged seat and the second supporting lug on the fork assembly are hingedly connected through a second horizontal shaft.

[0019] According to the utility model, the front end of the fork is provided with a vertical insertion hole for the bearing wheel to pass through.

[0020] According to the utility model, the fork assembly further comprises a mounting frame.

[0021] The rear end of the fork is fixed on the mounting frame and connected with the frame of the vehicle body assembly in a lifting manner relative to the vehicle body assembly through the mounting frame.

[0022] The bottom of the frame is provided with a wheel system.

[0023] The bottom of the frame is further provided with a guide block, and the inclined surface is arranged on the guide block.

[0024] According to the utility model, the both sides of the frame are provided with opposite sliding grooves, and the sliding grooves vertically extend.

[0025] The both sides of the mounting frame are provided with lifting rollers, and the two groups of lifting rollers are correspondingly and slidingly arranged in the two sliding grooves.

[0026] The frame is further provided with a driving member for driving the mounting frame to lift relative to the frame.

[0027] According to the utility model, the bottom of the mounting frame is provided with a directional wheel.

[0028] According to the utility model, the setting number of the forks and the bearing wheel lifting assemblies is two, the two bearing wheel lifting assemblies and the two forks are in one-to-one correspondence, and the two forks are arranged in parallel.

[0029] According to the utility model, the fork can be inserted into the lateral hole of the field-shaped tray.

[0030] (Three) beneficial effects

[0031] The utility model discloses a tray vehicle of carrying tray, which is suitable for transferring the tray with lateral holes and bottom holes. When transferring the tray, the bearing wheels on the fork are in a suspended state and do not contact the bottom of the lateral hole during the process of the fork extending into and out of the lateral hole of the tray, so as to avoid damaging the tray or causing the tray to slip. Meanwhile, the linkage of the bearing wheel lifting assembly and the fork assembly can drive the bearing wheels to lift synchronously when the fork assembly lifts relative to the vehicle body assembly to adjust the height of the fork, which improves the cooperation precision of the fork and the bearing wheel, and does not need to separately set a driving member for driving the bearing wheels to lift, thereby simplifying the overall structure and reducing the cost.

[0032] Furthermore, the tray vehicle of carrying tray is especially suitable for carrying the field-shaped tray. When the fork extends into and out of the lateral hole of the field-shaped tray, the bearing wheels on the fork are in a suspended state and do not contact the bottom of the lateral hole. DRAWINGS

[0033] Figure 1 It is a perspective view of the tray vehicle of carrying tray and the tray cooperation of the utility model;

[0034] Figure 2 It is a bottom view of the tray vehicle of carrying tray;

[0035] Figure 3 It is Figure 2 It is a perspective view of the vehicle body assembly in the utility model (one side plate body of the frame is not shown);

[0036] Figure 4 It is Figure 3Rear view;

[0037] Figure 5 is a three-dimensional schematic diagram of the fork assembly;

[0038] Figure 6 It is a three-dimensional schematic diagram of the load-bearing wheel lifting assembly.

[0039] [Description of Reference Numerals]

[0040] 1: Vehicle body assembly; 11: Vehicle frame; 12: Steering wheel; 13: Universal wheel; 14: Guide block; 141: Inclined surface; 15: Slide; 16: Fixed frame;

[0041] 2: Fork assembly; 21: Fork; 211: Vertical socket; 22: Mounting frame; 23: Fixed wheel; 24: Lifting roller; 25: First lug; 26: Second lug; 27: Push frame;

[0042] 3: Loading wheel lifting assembly; 31: Push-pull rod; 32: Roller; 33: Loading wheel; 34: Connecting seat; 35: Loading wheel seat; 36: Articulated seat;

[0043] 4: driving parts;

[0044] A: Field tray. DETAILED DESCRIPTION

[0045] In order to better explain the present invention and facilitate understanding, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Figure 2 The orientation is referenced.

[0046] See also Figures 1-6 The pallet truck for transporting pallets proposed in an embodiment of the present invention includes a vehicle body assembly 1, a fork assembly 2 and a load-bearing wheel lifting assembly 3.

[0047] The vehicle body assembly 1 is capable of traveling along a working surface. The fork assembly 2 includes a horizontally extending fork 21, which is connected to the vehicle body assembly 1 so that it can be raised and lowered relative to the vehicle body assembly 1. The load-bearing wheel lifting assembly 3 includes a push-pull rod 31, which is connected to the fork 21 and is positioned below the fork 21 so that it can be translated relative to the fork 21; a load-bearing wheel seat 35 hinged to the first end of the push-pull rod 31; and load-bearing wheels 33 hinged to the load-bearing wheel seat 35. The working surface is the ground on which the pallet truck travels.

[0048] The working principle of this pallet truck for transporting pallets is:

[0049] When the pallet truck is in an unloaded state before lifting, the vehicle body assembly 1 can move along the working surface, while the load-bearing wheels 33 are suspended in the air and do not touch the working surface. The forks 21 and the load-bearing wheels 33 located below the forks 21 can extend into the lateral holes of the pallet, and the load-bearing wheels 33 do not touch the bottom of the lateral holes.

[0050] When the fork 21 of the pallet truck needs to lift the pallet, the fork 21 drives the push-pull rod 31 to move upward synchronously relative to the body assembly 1. The push-pull rod 31 can translate in the first direction relative to the fork 21, and the load-bearing wheel seat can drive the load-bearing wheel 33 to rotate downward and fall to the work surface, so that the fork assembly 2 lifts the pallet and transfers it through the body assembly 1.

[0051] When the fork 21 of the pallet truck needs to unload the pallet: the fork 21 drives the push-pull rod 31 to move downward synchronously relative to the vehicle body assembly 1, the push-pull rod 31 can translate in a second direction opposite to the first direction relative to the fork 21, and the load-bearing wheel seat can drive the load-bearing wheel 33 to rotate upward and away from the working surface to be in a suspended state, and the fork 21 and the load-bearing wheel 33 located below the fork 21 can extend out of the side hole of the pallet, and the load-bearing wheel 33 does not contact the bottom of the side wheel.

[0052] As a result, the present pallet truck is capable of transporting pallets. When the pallet truck's forks 21 are inserted into and extended from the pallet's lateral holes for transport, the load-bearing wheels 33 on the forks 21 remain suspended and do not contact the bottom of the lateral holes, thus preventing damage to the pallet or causing it to slip. Furthermore, the linkage between the load-bearing wheel lifting assembly 3 and the fork assembly 2 allows the load-bearing wheels 33 to be raised and lowered synchronously when the fork assembly 2 is raised or lowered relative to the vehicle body assembly 1 to adjust the height of the forks 21. This improves the precision of the fit between the forks 21 and the load-bearing wheels 33, eliminates the need for a separate drive element for raising and lowering the load-bearing wheels 33, simplifies the overall structure, and reduces costs.

[0053] Furthermore, the pallet truck for transporting pallets is suitable for transporting pallets with side holes and bottom holes, and is particularly suitable for transporting the t-shaped pallet A. During transport, the fork 21 can be inserted into the side hole of the t-shaped pallet A, and when extending into and out of the side hole of the t-shaped pallet A, the load-bearing wheels 33 on the fork 21 are in a suspended state and do not contact the bottom of the side hole.

[0054] Furthermore, the second end of the push-pull rod 31 is hinged to the roller 32 . The roller 32 can roll and contact the inclined surface 141 on the vehicle body assembly 1 . The upper end of the inclined surface 141 is inclined toward the fork 21 .

[0055] When the fork 21 drives the push-pull rod 31 to move upward relative to the vehicle body assembly 1, the roller 32 can roll upward along the inclined surface 141 and push the push-pull rod 31 to move horizontally in a first direction relative to the fork 21, and the first direction points to the front end of the fork 21.

[0056] When the fork 21 drives the push-pull rod 31 to move downward relative to the vehicle body assembly 1, the roller 32 can roll downward along the inclined surface 141 and pull the push-pull rod 31 to move horizontally in the second direction relative to the fork 21, and the second direction points to the rear end of the fork 21.

[0057] Specifically, the axis of the roller 32 is oriented horizontally.

[0058] Furthermore, the first end of the push-pull rod 31 is pivotally connected to the load-bearing wheel seat 35 around a horizontal axis, and the load-bearing wheel seat 35 is pivotally connected to the fork 21 around a horizontal axis.

[0059] The second end of the push-pull rod 31 is also pivotally connected to the hinge seat 36 around a horizontal axis. The hinge seat 36 pivotally connects the fork 21 around a horizontal axis.

[0060] When the fork 21 of the pallet truck needs to lift the pallet: the fork 21 drives the push-pull rod 31 to move upward synchronously relative to the vehicle body assembly 1, the roller 32 can roll upward along the inclined surface 141, and push the push-pull rod 31 to translate in the first direction relative to the fork 21, the two ends of the articulated seat 36 can rotate relative to the fork 21 and the push-pull rod 31, and the first end of the push-pull rod 31 can push the load-bearing wheel seat 35 to rotate downward around the horizontal axis relative to the fork 21, so as to drive the load-bearing wheel 33 to rotate downward around the horizontal axis and be supported on the work surface.

[0061] When the fork of the pallet truck needs to unload the field pallet: the fork 21 drives the push-pull rod 31 to move downward synchronously relative to the vehicle body assembly 1, the roller 32 can roll downward along the inclined surface 141, and pull the push-pull rod 31 to translate in the second direction, and make the two ends of the articulated seat 36 rotate relative to the fork 21 and the push-pull rod 31, and the first end of the push-pull rod 31 pulls the load-bearing wheel seat 35 to rotate upward around the horizontal axis relative to the fork 21, so as to drive the load-bearing wheel 33 to rotate upward around the horizontal axis and leave the working surface and be in a suspended state.

[0062] Specifically, the second end of the push-pull rod 31 is fixedly connected to the connecting seat 34 , and the connecting seat 34 is rotatably connected to the hinge seat 36 and the roller 32 around a horizontal axis.

[0063] When the fork 21 of the pallet truck needs to lift the pallet: the roller 32 can roll upward along the inclined surface 141, and push the push-pull rod 31 to translate in the first direction relative to the fork 21 through the connecting seat 34, and the two ends of the articulated seat 36 can rotate relative to the fork 21 and the connecting seat 34.

[0064] When the pallet truck's fork needs to unload the square pallet, the roller 32 can roll down along the inclined surface 141 and pull the push-pull rod 31 to translate in the second direction through the connecting seat 34, and make the two ends of the hinge seat 36 rotate relative to the fork 21 and the connecting seat 34.

[0065] Specifically, the load-bearing wheel seat 35 and the first lug 26 on the fork 21 are hinged via a first horizontal axis.

[0066] The hinge seat 36 and the second lug 25 on the fork assembly 2 are hinged via a second horizontal axis.

[0067] Specifically, the push-pull rod 31 is parallel to the extension direction of the fork 21, with the first end of the push-pull rod 31 close to the front end of the fork 21 and the second end close to the rear end of the fork 21. This allows the load-bearing wheel 33 at the first end of the push-pull rod 31 to correspond to the front end of the fork 21, thereby improving the support stability of the fork 21. The front end of the fork 21 is the end that extends into the side hole of the pallet.

[0068] The push-pull rod 31 can move in a first direction or a second direction parallel to the extending direction of the fork 21 .

[0069] Preferably, the load-bearing wheels 33 are double load-bearing wheels 33 so as to improve the support stability of the load-bearing wheels 33 on the front end of the fork A when the fork 21 needs to lift the pallet.

[0070] Specifically, a vertical insertion hole 211 is provided at the front end of the fork 21 for the load-bearing wheel 33 to pass through, so that the load-bearing wheel 33 can be raised and lowered through the vertical insertion hole 211, and then when the fork 21 is not lifting the pallet, the overall height of the fork 21 and the load-bearing wheel 33 is reduced to facilitate insertion into the side hole of the pallet.

[0071] Furthermore, the fork assembly 2 further includes a mounting bracket 22 .

[0072] The rear end of the fork 21 is fixed on the mounting frame 22 and is connected to the vehicle body assembly 1 via the mounting frame 22 so as to be lifted relative to the vehicle body assembly 1 .

[0073] The connecting seat 34 is hinged to the mounting frame 22 rotatably around a horizontal axis to hinge the fork 21 . The hinged seat 36 is hinged to the second lug 25 of the mounting frame 22 via a second horizontal axis to hinge the fork 21 .

[0074] Specifically, a directional wheel 23 is provided at the bottom of the mounting frame 22 .

[0075] When the pallet truck is in an unloaded state and moves along the working surface, the directional wheels 23 contact the ground and assist in supporting the pallet truck to move along the working surface.

[0076] When the forks 21 of the pallet truck are in the pallet lifting state, the directional wheels 23 are off the ground and suspended in the air.

[0077] Furthermore, the vehicle body assembly 1 includes a vehicle frame 11. A wheel train is provided at the bottom of the vehicle frame 11 so that the vehicle body assembly 1 can drive the entire pallet truck to move in any direction on the working surface.

[0078] The rear end of the fork 21 is connected to the vehicle frame 11 via a mounting bracket 22 so as to be raised and lowered relative to the vehicle frame 11 .

[0079] Specifically, the wheel train includes a steering wheel 12 and a universal wheel 13. More specifically, there are multiple universal wheels 13, which are arranged on both sides of the steering wheel 12 to improve the support stability of the frame 11.

[0080] Furthermore, opposing vertically extending chute grooves 15 are provided on either side of the vehicle frame 11. Lifting rollers 24 are provided on either side of the mounting frame 22. Two sets of lifting rollers 24 slide in the corresponding chute grooves 15. The sliding engagement between the lifting rollers 24 and the chute grooves 15 improves the precision with which the mounting frame 22 can be raised and lowered relative to the vehicle frame 11.

[0081] Furthermore, a driving member 4 is provided on the vehicle frame 11 for driving the mounting frame 22 to rise and fall relative to the vehicle frame 11 .

[0082] Specifically, the driving member 4 is a cylinder, the main body of the cylinder is fixed on the frame 11, and the lifting end of the cylinder is fixedly connected to the mounting frame 22. The cylinder is used to drive the mounting frame 22 to rise and fall relative to the frame 11.

[0083] Specifically, a fixing frame 16 is fixedly provided on the vehicle frame 11, and the main body of the cylinder is fixed on the fixing frame 16. A pushing frame 27 is fixedly provided on the mounting frame 22, and the lifting end of the cylinder is fixedly connected to the pushing frame 27.

[0084] Optionally, the driving member 4 is an oil cylinder to ensure its driving strength.

[0085] Furthermore, the number of forks 21 and load-bearing wheel lifting assemblies 3 is two, the two load-bearing wheel lifting assemblies 3 correspond to the two forks 21 one by one, and the two forks 21 are arranged in parallel so that the forks 21 can stably lift and support the pallet.

[0086] Furthermore, a guide block 14 is fixedly provided at the bottom of the vehicle frame 11 , and an inclined surface 141 is provided on the guide block 14 .

[0087] Alternatively, two inclined surfaces 141 are provided on the guide block at intervals to form two inclined surfaces 141 corresponding to the rollers 32 of the two load-bearing wheel lifting assemblies 3 .

[0088] In the description of this utility model, it should be understood that 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 number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0089] In this utility model, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connections, removable connections, or integration. They may refer to mechanical connections or electrical connections. They may refer to direct connections or indirect connections through an intermediary. They may refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0090] In the present invention, unless otherwise expressly specified or limited, when a first feature is “above” or “below” a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above,” “above,” or “above” a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is “below,” “below,” or “below” a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0091] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0092] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A pallet truck for transporting pallets, characterized in that: It comprises a vehicle body assembly (1), a fork assembly (2) and a load-bearing wheel lifting assembly (3); The vehicle body assembly (1) is capable of moving along a working surface; the fork assembly (2) comprises a horizontally extending fork (21), and the fork (21) is capable of being connected to the vehicle body assembly (1) in a lifting manner relative to the vehicle body assembly (1); the load-bearing wheel lifting assembly (3) comprises a push-pull rod (31) capable of being connected to the fork (21) in a translational manner relative to the fork (21) and located below the fork (21), a load-bearing wheel seat (35) hinged to a first end of the push-pull rod (31), and the load-bearing wheel (33) hinged to the load-bearing wheel seat (35); The second end of the push-pull rod (31) is hinged to a roller (32), and the roller (32) is capable of rolling contact with an inclined surface (141) on the vehicle body component (1), and the upper end of the inclined surface (141) is inclined toward the fork (21); When the fork (21) drives the push-pull rod (31) to move upward synchronously relative to the vehicle body assembly (1), the roller (32) can roll upward along the inclined surface (141), the push-pull rod (31) can translate relative to the fork (21) in a first direction, the first direction pointing to the front end of the fork (21), and the load-bearing wheel seat (35) can drive the load-bearing wheel (33) to rotate downward and fall onto the working surface; When the fork (21) drives the push-pull rod (31) to move downward synchronously relative to the vehicle body assembly (1), the roller (32) can roll downward along the inclined surface (141), the push-pull rod (31) can translate relative to the fork (21) in a second direction opposite to the first direction, and the load-bearing wheel seat (35) can drive the load-bearing wheel (33) to rotate upward and leave the working surface.

2. The pallet truck for transporting pallets according to claim 1, wherein: The first end of the push-pull rod (31) is hinged to the load-bearing wheel seat (35) in a rotational manner around a horizontal axis, and the load-bearing wheel seat (35) is hinged to the cargo fork (21) in a rotational manner around a horizontal axis; The second end of the push-pull rod (31) is also hinged to the hinge seat (36) in a manner that it can rotate around a horizontal axis; the hinge seat (36) is hinged to the fork (21) in a manner that it can rotate around a horizontal axis.

3. The pallet truck for transporting pallets according to claim 2, wherein: The load-bearing wheel seat (35) and the first lug (26) on the fork (21) are hinged via a first horizontal axis; The second end of the push-pull rod (31) is fixedly connected to the connecting seat (34), and the connecting seat (34) is hinged to the hinge seat (36) and the roller (32) in a rotatable manner around a horizontal axis. The hinge seat (36) and the second lug (25) on the fork assembly (2) are hinged through a second horizontal axis.

4. The pallet truck for transporting pallets according to claim 3, wherein: The front end of the fork (21) is provided with a vertical insertion hole (211) for the carrying wheel (33) to pass through.

5. The pallet truck for transporting pallets according to claim 1, wherein: The fork assembly (2) further includes a mounting frame (22); The rear end of the fork (21) is fixed on the mounting frame (22) and is connected to the frame (11) of the vehicle body assembly (1) via the mounting frame (22) so as to be lifted relative to the vehicle body assembly (1); A wheel train is provided at the bottom of the vehicle frame (11); A guide block (14) is also fixedly provided at the bottom of the vehicle frame (11), and the inclined surface (141) is provided on the guide block (14).

6. The pallet truck for transporting pallets according to claim 5, characterized in that: Opposite slide grooves (15) are provided on both sides of the vehicle frame (11), and the slide grooves (15) extend vertically; Lifting rollers (24) are provided on both sides of the mounting frame (22), and two groups of the lifting rollers (24) are slidably arranged in the two sliding grooves (15) in a one-to-one correspondence; The vehicle frame (11) is also provided with a driving member (4) for driving the mounting frame (22) to rise and fall relative to the vehicle frame (11).

7. The pallet truck for transporting pallets according to claim 5, wherein: A directional wheel (23) is provided at the bottom of the mounting frame (22).

8. The pallet truck for transporting pallets according to claim 1, wherein: The number of the cargo forks (21) and the load-bearing wheel lifting assemblies (3) is two, the two load-bearing wheel lifting assemblies (3) correspond to the two cargo forks (21) in one-to-one correspondence, and the two cargo forks (21) are arranged in parallel.

9. The pallet truck for transporting pallets according to claim 1, wherein: The fork (21) can be inserted into the side hole of the field pallet (A).

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