Pallet truck suitable for field support carrying

Abstract

The embodiment of the invention provides a pallet truck suitable for field support carrying. The pallet truck suitable for field support carrying comprises but is not limited to a truck head part and a pallet fork part; the vehicle head part comprises but is not limited to a vehicle main frame body and an auxiliary wheel set, and the fork part comprises but is not limited to a fork frame and a bearing wheel set; the vehicle head part is used for driving the pallet fork part to move relative to the vehicle main frame body in the vertical direction; when the pallet fork part moves upwards relative to the main frame body, the auxiliary wheel set is folded upwards in the vertical direction relative to the main frame body; when the pallet fork part moves downwards relative to the main frame body, the auxiliary wheel set extends downwards in the vertical direction relative to the main frame body; the head part is used for driving the bearing wheel set to rotate relative to the fork part to get close to or away from the fork part. Damage to the matts-shaped tray can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of transportation equipment, and in particular to a pallet truck suitable for field transport. Background Art

[0002] The existing field pallet trucks are ordinary Sichuan-shaped pallet trucks. When the fork arm enters the field pallet, the load-bearing wheels will roll over the field pallet, which will cause damage to the field pallet. Summary of the invention

[0003] The embodiment of the present application provides a pallet truck suitable for field pallet transportation, which can avoid causing damage to the field pallet.

[0004] The embodiment of the present application provides a pallet truck suitable for field pallet transportation, including but not limited to a truck head and a fork portion;

[0005] The vehicle head includes but is not limited to a vehicle main frame and auxiliary wheels, and the fork portion includes but is not limited to a fork frame and a load-bearing wheel set;

[0006] The head part of the vehicle is used to drive the fork part to move relative to the main frame of the vehicle in the vertical direction; when the fork part moves upward relative to the main frame of the vehicle, the auxiliary wheel group is retracted upward relative to the main frame of the vehicle in the vertical direction; when the fork part moves downward relative to the main frame of the vehicle, the auxiliary wheel group is extended downward relative to the main frame of the vehicle in the vertical direction; the head part of the vehicle is used to drive the load-bearing wheel group to rotate relative to the fork part to approach or move away from the fork part.

[0007] Optionally, the front part of the vehicle includes a driving system, which includes but is not limited to a driving wheel set, and the driving wheel set is fixed to the main frame of the vehicle by screws. The driving system is used to control the movement of the driving wheel set to drive the movement of the front part of the vehicle.

[0008] Optionally, the load-bearing wheel set is rotatably connected to the fork frame.

[0009] Optionally, the fork portion includes but is not limited to a load-bearing wheel follower mechanism and a latch, the latch is fixed to the fork frame, the latch extends in a vertical direction, and a downward end of the latch is provided with an inclined surface;

[0010] The auxiliary wheel assembly includes but is not limited to an auxiliary wheel main frame, an inner frame, a roller, an elastic column pin, a torsion spring, a pin shaft, a pin shaft, an auxiliary wheel and an auxiliary wheel shaft; the auxiliary wheel main frame is fixed to the main frame of the vehicle, the inner frame and the auxiliary wheel main frame are connected by a pin shaft to form a hinge, and the inner frame can rotate relative to the auxiliary wheel main frame; one end of the torsion spring is pressed against the elastic column pin fixed to the inner frame, and the other end is pressed against the pin shaft fixed to the auxiliary wheel main frame;

[0011] When the fork moves downward relative to the vehicle head, the inclined surface of the pin abuts against the roller and moves downward, driving the inner frame to rotate relative to the auxiliary wheel main frame, driving the auxiliary wheel to move downward; when the fork moves upward relative to the vehicle head, the inclined surface of the pin moves away from the roller, and the torsion spring drives the inner frame to rotate relative to the auxiliary wheel main frame, driving the auxiliary wheel to move upward.

[0012] Optionally, the auxiliary wheel group includes but is not limited to the limit pin, and the limit pin is arranged in the inner frame. When the torsion spring drives the inner frame to rotate relative to the auxiliary wheel main frame, and drives the auxiliary wheel group to move upward until the auxiliary wheel shaft abuts the limit pin, the limit pin limits the rotation of the inner frame relative to the auxiliary wheel main frame.

[0013] Optionally, the drive system includes, but is not limited to, a main lifting cylinder, an auxiliary cylinder, a pin, a pin, a composite roller bearing, a slot frame, and a pin;

[0014] A plurality of composite roller bearings are installed on the fork frame, and the composite roller bearings cooperate with the slot frame to form a sliding pair, and the fork frame can make up and down linear motion relative to the front main frame; one end of the main lifting cylinder forms a hinge with the fork frame through a pin shaft, and the other end forms a hinge with the front main frame, and the main lifting cylinder drives the fork frame to move relative to the main frame in the vertical direction; one end of the auxiliary cylinder forms a hinge with the front main frame through a pin shaft, and the other end of the auxiliary cylinder forms a hinge with the load-bearing wheel follower mechanism through a pin shaft, and the auxiliary cylinder is used to drive the load-bearing wheel follower mechanism to drive the load-bearing wheel group to rotate relative to the fork part to approach or move away from the fork part.

[0015] Optionally, the load-bearing wheel follower mechanism includes but is not limited to a load-bearing wheel frame, a pin shaft, a connecting rod, a pin shaft, a pin shaft, a pin shaft, a pin shaft, a pin shaft and a swing rod; the lower end of the auxiliary oil cylinder forms a hinge with the swing rod through the pin shaft; the swing rod forms a hinge with the fork frame through the pin shaft; the connecting rod forms a hinge with the swing rod through the pin shaft; one end of the load-bearing wheel frame forms a hinge with the fork frame through the pin shaft; the middle part of the load-bearing wheel frame and the connecting rod form a hinge through the pin shaft; the load-bearing wheel frame forms a hinge with the load-bearing wheel group through the pin shaft;

[0016] When the auxiliary oil cylinder is retracted, the swing arm rotates counterclockwise around the pin shaft, driving the load-bearing wheel set to rotate relative to the fork frame to move away from the fork frame to achieve extension; when the auxiliary oil cylinder is extended, the swing arm rotates clockwise around the pin shaft, driving the load-bearing wheel set to rotate relative to the fork frame to move closer to the fork frame to achieve retraction.

[0017] Optionally, there are multiple auxiliary oil cylinders.

[0018] Optionally, the latch is fixed to the fork frame by screws.

[0019] Optionally, the auxiliary wheel main frame is fixed to the vehicle main frame by screws.

[0020] The pallet truck suitable for pallet handling provided in the embodiment of the present application includes but is not limited to a head and a fork; the head includes but is not limited to a main frame and an auxiliary wheel set, and the fork includes but is not limited to a fork frame and a load-bearing wheel set; the head is used to drive the fork to move relative to the main frame in the vertical direction; when the fork moves upward relative to the main frame, the auxiliary wheel set is retracted upward relative to the main frame in the vertical direction; when the fork moves downward relative to the main frame, the auxiliary wheel set extends downward relative to the main frame in the vertical direction; the head is used to drive the load-bearing wheel set to rotate relative to the fork to approach or move away from the fork. The pallet truck provided in the present application adds the lifting function of the forklift load-bearing wheel set and the auxiliary wheel set on the basis of an ordinary pallet truck, and the height of the fork arm can remain unchanged after the load-bearing wheel set is lifted. When the load-bearing wheel set is in the lifted state, the fork arm can enter and exit the field-shaped pallet without contacting the pallet, thereby realizing non-destructive forking and carrying of the field pallet and avoiding damage to the field-shaped pallet. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0022] Figure 1 It is a front view structural schematic diagram of a pallet truck in the prior art.

[0023] Figure 2 The figure is a schematic diagram of the structure of a pallet truck in the prior art when viewed from above.

[0024] Figure 3 It is a schematic diagram of a pallet truck approaching a square pallet in the prior art.

[0025] Figure 4 It is a schematic diagram of a pallet truck in the prior art when lowering its height.

[0026] Figure 5 A front view structural schematic diagram of an embodiment of a pallet truck suitable for field support transportation provided in an embodiment of the present application.

[0027] Figure 6 A bottom-up structural schematic diagram of an embodiment of a pallet truck suitable for field support transportation provided in an embodiment of the present application.

[0028] Figure 7 A schematic diagram of an embodiment of a pallet truck suitable for field pallet transportation provided in an embodiment of the present application during field pallet transportation.

[0029] Figure 8A schematic diagram of another embodiment of a pallet truck suitable for field pallet transportation provided in an embodiment of the present application during field pallet transportation.

[0030] Fig. 9 The present invention is a schematic diagram of the overall structure of another embodiment of a pallet truck suitable for field support transportation provided in the embodiment of the present application.

[0031] Fig.10 A schematic structural diagram of the vehicle head in another embodiment of a pallet truck suitable for field support transportation provided in an embodiment of the present application.

[0032] Fig.11 This is a schematic diagram of the overall structure of the fork portion in another embodiment of a pallet truck suitable for field pallet transportation provided in an embodiment of the present application.

[0033] Fig.12 A schematic structural diagram of an auxiliary wheel assembly in another embodiment of a pallet truck suitable for field support transportation provided in an embodiment of the present application.

[0034] Fig.13 A schematic diagram of the exploded structure of another embodiment of a pallet truck suitable for field transport provided in an embodiment of the present application.

[0035] Fig.14 This is a schematic diagram of the front structural view of the fork portion in another embodiment of a pallet truck suitable for field pallet transportation provided in an embodiment of the present application. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0037] See also Figure 1 and Figure 2 , Figure 1 and Figure 2 The present invention is a schematic diagram of a common pallet truck in the prior art. The pallet truck mainly comprises a head part (1) and a fork part (2). The head part (1) comprises a head main frame (101) and a drive unit (102), etc., and the fork part (2) comprises a fork frame (201) and a load-bearing wheel set (202).

[0038] Figure 3 and Figure 4The diagram shows a scene of a pallet truck entering a pallet. When in use, the fork frame part (2) is lowered to a suitable height through the hydraulic system, and the load-bearing wheel group (202) will usually move forward and backward passively. It can be seen that when an ordinary pallet truck (2-1) enters a pallet truck (2-2), the load-bearing wheel group (202) will collide with the crossbeam of the pallet truck (2-2), and even push the pallet forward. On the one hand, for an unmanned forklift, this possibility of pushing the pallet when entering the fork will bring more problems to the control; on the other hand, it will also cause certain damage to the pallet.

[0039] In order to solve the above problems, an embodiment of the present application provides a pallet truck suitable for field support transportation.

[0040] like Figure 5 and Figure 6 As shown, in one embodiment, the pallet truck includes but is not limited to a truck head (3-1) and a fork part (3-2). The truck head (3-1) includes but is not limited to a truck main frame (3-101) and an auxiliary wheel set (3-3), and the fork part (3-2) includes but is not limited to a fork frame (3-201) and a load-bearing wheel set (3-202). The vehicle head portion (3-1) is used to drive the cargo fork portion (3-2) to move relative to the vehicle main frame (3-101) in the vertical direction; when the cargo fork portion (3-2) moves upward relative to the vehicle main frame (3-101), the auxiliary wheel set (3-3) is retracted upward relative to the vehicle main frame (3-101) in the vertical direction; when the cargo fork portion (3-2) moves downward relative to the vehicle main frame (3-101), the auxiliary wheel set (3-3) is extended downward relative to the vehicle main frame (3-101) in the vertical direction; the vehicle head portion (3-1) is used to drive the load-bearing wheel set (3-202) to rotate relative to the cargo fork portion (3-2) to approach or move away from the cargo fork portion (3-2).

[0041] The vehicle head (3-1) includes but is not limited to a driving wheel set (3-102), the driving wheel set (3-102) is fixed to the vehicle main frame (3-101) by screws, and the vehicle head (3-1) is used to control the movement of the driving wheel set (3-102) to drive the vehicle head (3-1) to move.

[0042] Similar to ordinary pallet trucks, in addition to the above main structures, unmanned pallet trucks or electric pallet trucks also have electrical systems, hydraulic systems, control systems, communication systems, etc., which are not shown. The fork frame (3-201) can be driven by a hydraulic / electric driving mechanism to actively lift and lower. Usually, the load-bearing wheel set (3-202) moves back and forth passively due to the movement of the fork frame (3-201) to adapt to the change in height. The auxiliary wheel set (3-3) can actively or passively switch between the ground and off-ground states due to the movement of the fork frame (3-201).

[0043] See also Figure 7 , Figure 7 It is a working process and action sequence of a pallet truck. Figure 7 As shown, Figure 7 4-1 indicates that the pallet truck is in an unloaded running state, the driving unit (3-102) and the load-bearing wheel set (3-202) of the pallet truck are on the ground, and the auxiliary wheel set (3-3) is at a certain height above the ground. At this time, the whole vehicle has three points of contact with the ground, which can ensure a better driving and grounding effect.

[0044] Figure 7 4-2 is a fork entry preparation state, the fork part (3-2) of the pallet truck is lowered to a suitable fork entry height, and the auxiliary wheel set (3-3) can be touched to the ground simultaneously or in different time periods.

[0045] Figure 7 Step 4-3 is the forklift preparation state, and the load-bearing wheel set (3-202) of the pallet truck is actively retracted. Since the auxiliary wheel set (3-3) has touched the ground in step 4-2, the center of gravity of the whole vehicle is designed to be between the auxiliary wheel set (3-3) and the driving wheel set (3-102). At this time, the auxiliary wheel set (3-3) can support the vehicle body, and the vehicle body is still in a stable state.

[0046] Figure 7 The 4-4 in the diagram is the fork-in state, and the vehicle moves forward a certain distance.

[0047] Figure 7 4-5 in the figure lowers the load-bearing wheel set (3-202) to the ground.

[0048] Figure 7 4-6 in the figure is the lifting state. During the lifting process, the load-bearing wheel set (3-202) is always on the ground, and the auxiliary wheel set (3-3) can be lifted off the ground actively or passively. When the pallet is lifted off the ground, the load can be moved. When the goods need to be released, the opposite logical action can be used to complete the fork release.

[0049] In summary, when the pallet truck enters the field, it lowers the fork arm to a certain height, retracts the load-bearing wheel set off the ground through active or passive (linkage) mechanisms, and synchronously or asynchronously lowers the auxiliary wheel set to the ground, so as to switch from the pallet truck state to a counterbalanced forklift state, and then it can enter. When the fork reaches a certain depth, the load-bearing wheel set is lowered to the ground, and the auxiliary wheel set is retracted off the ground synchronously or asynchronously, and the state of the counterbalanced weight is switched back to the state of the pallet truck, and the fork is lifted to lift the pallet off the ground, and the handling action can be completed.

[0050] It should be noted that this figure is only used to describe the method, and there can be many examples. The figure above shows that the auxiliary wheel set (3-3) is fixed to the head of the vehicle (3-1). Figure 8As shown, the auxiliary wheel set (3-3) can also be fixed to the fork frame (3-302). When the auxiliary wheel set (3-3) can also be fixed to the fork frame (3-302), the height of the lowered fork is unique. The auxiliary wheel set (3-3) can be placed on both sides of the vehicle body or in the middle of the fork. For the purpose of stabilizing the vehicle body, the auxiliary wheel set (3-3) is preferably placed on both sides of the vehicle body. In addition, for unmanned forklifts, for the purpose of stabilizing the vehicle body, floating universal wheels are usually designed on both sides of the driving wheel set (3-102).

[0051] See also Figure 9-14 In another embodiment, the pallet truck includes but is not limited to a truck head (6-1) and a fork portion (6-2); the truck head (6-1) includes but is not limited to a truck main frame (703) and an auxiliary wheel set (702), and the fork portion (6-2) includes but is not limited to a fork frame (802) and a load-bearing wheel set (11-9); the truck head (6-1) is used to drive the fork portion (6-2) to move relative to the truck main frame (703) in a vertical direction; When the vehicle body (703) moves upward relative to the vehicle body, the auxiliary wheel set (702) is retracted upward relative to the vehicle body; when the fork portion (6-2) moves downward relative to the vehicle body, the auxiliary wheel set (702) is extended downward relative to the vehicle body; the vehicle head (6-1) is used to drive the load-bearing wheel set (11-9) to rotate relative to the fork portion (6-2) to approach or move away from the fork portion (6-2).

[0052] In the embodiment of the present application, the front part of the vehicle (6-1) includes a driving system (704), and the front part of the vehicle (6-1) includes but is not limited to a driving wheel set (701), and the driving wheel set (701) is fixed to the vehicle main frame (703) by screws. The driving system (704) is used to control the movement of the driving wheel set (701) to drive the movement of the front part of the vehicle (6-1).

[0053] In the embodiment of the present application, the load-bearing wheel set (11-9) is rotatably connected to the fork frame (802).

[0054] In the embodiment of the present application, the fork portion (6-2) includes but is not limited to a load-bearing wheel follower mechanism (801) and a latch (803), the latch (803) is fixed to the fork frame (802), the latch (803) extends in a vertical direction, and a downward end of the latch (803) is provided with an inclined surface. The auxiliary wheel assembly (702) includes but is not limited to an auxiliary wheel main frame (901), an inner frame (902), a roller (903), an elastic pin (904), a torsion spring (905), a pin shaft (906), a pin shaft (907), an auxiliary wheel (909), and an auxiliary wheel shaft (910). The inner frame (902) and the auxiliary wheel main frame (901) are connected to form a hinge through a pin shaft (906), and the inner frame (902) can rotate relative to the auxiliary wheel main frame (901); one end of the torsion spring (905) is pressed against an elastic column pin (904) fixed on the inner frame (902), and the other end is pressed against a pin shaft (907) fixed on the auxiliary wheel main frame (901); when the fork portion (6-2) moves downward relative to the vehicle head portion (6-1), the latch (80 The inclined surface of the inner frame (902) of the auxiliary wheel main frame (901) is pressed against the roller (903) and moves downward, driving the inner frame (902) to rotate relative to the auxiliary wheel main frame (901), driving the auxiliary wheel (909) to move downward; when the fork portion (6-2) moves upward relative to the vehicle head portion (6-1), the inclined surface of the latch (803) moves away from the roller (903), and the torsion spring (905) drives the inner frame (902) to rotate relative to the auxiliary wheel main frame (901), driving the auxiliary wheel (909) to move upward.

[0055] In the embodiment of the present application, the auxiliary wheel assembly (702) includes but is not limited to a limit pin (908), and the limit pin (908) is arranged in the inner frame (902). When the torsion spring (905) drives the inner frame (902) to rotate relative to the auxiliary wheel main frame (901), and drives the auxiliary wheel assembly (702) to move upward until the auxiliary wheel shaft (910) abuts the limit pin (908), the limit pin (908) limits the rotation of the inner frame (902) relative to the auxiliary wheel main frame (901).

[0056] In summary, when the driving system (704) drives the fork frame (802) to rise to a certain height, the latch (803) is disengaged from the auxiliary wheel mechanism (702), and the auxiliary wheel (909) is off the ground; when the hydraulic system drives the fork frame (802) to fall to a certain height, the latch (803) is inserted into the auxiliary wheel mechanism (702), and the auxiliary wheel (909) touches the ground. It can be seen that at this time, if the fork frame (802) continues to fall in height, the auxiliary wheel (909) remains at a constant height and is still in the ground state.

[0057] In the embodiment of the present application, the drive system (704) includes but is not limited to a main lifting cylinder (10-1), an auxiliary cylinder (10-2), a pin (10-3), a pin (10-4), a composite roller bearing (10-5), a slot frame (10-6) and a pin (10-7); a plurality of composite roller bearings (10-5) are installed on the fork frame (802), and the fork frame (802) cooperates with the slot frame (10-6) through the composite roller bearings (10-5) to form a sliding pair, and the fork frame (802) can make a linear movement up and down relative to the front main frame (703); one end of the main lifting cylinder (10-1) is connected to the fork frame through the pin (10-4). The main lifting cylinder (10-1) drives the fork frame (802) to move relative to the main frame (703) of the vehicle in the vertical direction; one end of the auxiliary cylinder (10-2) forms a hinge with the main frame (703) of the vehicle head through a pin shaft (10-7), and the other end of the auxiliary cylinder (10-2) forms a hinge with the load-bearing wheel follower mechanism (801) through a pin shaft (10-3); the auxiliary cylinder (10-2) is used to drive the load-bearing wheel follower mechanism (801) to drive the load-bearing wheel group (11-9) to rotate relative to the fork portion (6-2) to approach or move away from the fork portion (6-2).

[0058] In the embodiment of the present application, the load-bearing wheel follower mechanism (801) includes but is not limited to a load-bearing wheel frame (11-1), a pin (11-2), a connecting rod (11-3), a pin (11-4), a pin (11-5), a pin (11-6), a pin (11-7), a pin (11-8) and a swing rod (11-10); the lower end of the auxiliary oil cylinder (10-2) forms a hinge with the swing rod (11-10) through the pin (11-6); the swing rod (11-10) forms a hinge with the fork frame (802) through the pin (11-5); the connecting rod (11-3) forms a hinge with the swing rod (11-10) through the pin (11-4); one end of the load-bearing wheel frame (11-1) forms a hinge with the fork frame (802) through the pin (11-7). The middle part of the load-bearing wheel frame (11-1) and the connecting rod (11-3) form a hinge through the pin shaft (11-2); the load-bearing wheel frame (11-1) forms a hinge with the load-bearing wheel group (11-9) through the pin shaft (11-8); when the auxiliary oil cylinder (10-2) is retracted, the swing rod (11-10) rotates counterclockwise around the pin shaft (11-5), driving the load-bearing wheel group (11-9) to rotate relative to the fork frame (802) to approach the fork frame (802), thereby achieving retraction; when the auxiliary oil cylinder (10-2) is extended, the swing rod (11-10) rotates clockwise around the pin shaft (11-5), driving the load-bearing wheel group (11-9) to rotate relative to the fork frame (802) to move away from the fork frame (802), thereby achieving extension.

[0059] In summary, the swing rod (11-10), the connecting rod (11-3), the fork frame (802), and the load-bearing wheel frame (11-1) form a four-link mechanism. When the main lifting cylinder (10-1) drives the fork frame (802) to move upward or downward, the load-bearing wheel set (11-9) will follow the movement, and the fork arm can be kept as horizontal as possible when the auxiliary wheel set (11-9) is always on the ground. When the auxiliary cylinder (10-2) is retracted, the swing rod (11-10) rotates counterclockwise around the pin shaft (11-5), which can drive the load-bearing wheel set (11-9) to be retracted; the swing rod (11-10) rotates clockwise around the pin shaft (11-5), which can drive the load-bearing wheel set (11-9) to be lowered.

[0060] In the embodiment of the present application, the number of auxiliary oil cylinders (10-2) is multiple.

[0061] In the embodiment of the present application, the latch (803) is fixed to the fork frame (802) by screws.

[0062] In the embodiment of the present application, the auxiliary wheel main frame (901) is fixed to the vehicle main frame (703) by screws.

[0063] In the embodiment of the present application, the movement of the main lifting cylinder passively (or linked) triggers the movement of the auxiliary wheel mechanism to achieve the grounding and lifting of the auxiliary wheel, and the folding and lowering of the load-bearing wheel is actively achieved through the movement of the auxiliary cylinder. When running without load. The load-bearing wheel touches the ground, and the fork arm is lifted to a high position so that the auxiliary wheel is off the ground. At this time, the two load-bearing wheel groups and the driving wheel group are running on the ground. When fork entry is required, the fork arm is lowered to a certain height so that the auxiliary wheel touches the ground, and then the load-bearing wheel group is actively folded up through the auxiliary cylinder. At this time, the two auxiliary wheels and the driving wheel group are running on the ground, the load-bearing wheel group is folded, and the state of the counterweight is switched to fork entry. When it is necessary to lift goods, the load-bearing wheel group is first actively lowered by the auxiliary cylinder, and then the fork arm is lifted to a certain height so that the auxiliary wheel is off the ground. At this time, it is switched to the load operation state of the pallet truck.

[0064] In the embodiment of the present application, the movement of the auxiliary wheel mechanism is passively (or linked) triggered by the movement of the main lifting cylinder to achieve the control of landing and lifting off. In addition, it can also be replaced with an active execution structure (motor screw, hydraulic cylinder, electric push rod, electro-hydraulic push rod, etc.), and the landing and lifting off of the auxiliary wheel can be achieved by controlling the movement of the execution mechanism.

[0065] The pallet truck suitable for pallet handling provided in the embodiment of the present application includes but is not limited to a head and a fork; the head includes but is not limited to a main frame and an auxiliary wheel set, and the fork includes but is not limited to a fork frame and a load-bearing wheel set; the head is used to drive the fork to move relative to the main frame in the vertical direction; when the fork moves upward relative to the main frame, the auxiliary wheel set is retracted upward relative to the main frame in the vertical direction; when the fork moves downward relative to the main frame, the auxiliary wheel set extends downward relative to the main frame in the vertical direction; the head is used to drive the load-bearing wheel set to rotate relative to the fork to approach or move away from the fork. The pallet truck provided in the present application adds the lifting function of the forklift load-bearing wheel set and the auxiliary wheel set on the basis of an ordinary pallet truck, and the height of the fork arm can remain unchanged after the load-bearing wheel set is lifted. When the load-bearing wheel set is in the lifted state, the fork arm can enter and exit the field-shaped pallet without contacting the pallet, thereby realizing non-destructive forking and carrying of the field pallet and avoiding damage to the field-shaped pallet.

[0066] The above is a detailed introduction to the pallet truck suitable for field support transportation provided by the embodiment of the present application. This article uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the present application. At the same time, for those skilled in the art, according to the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A pallet truck suitable for field support and transportation, characterized in that: The pallet truck includes but is not limited to a truck head and a fork; The vehicle head includes but is not limited to a vehicle main frame and auxiliary wheels, and the fork portion includes but is not limited to a fork frame and a load-bearing wheel set; The head part of the vehicle is used to drive the fork part to move relative to the main frame of the vehicle in the vertical direction; when the fork part moves upward relative to the main frame of the vehicle, the auxiliary wheel group is retracted upward relative to the main frame of the vehicle in the vertical direction; when the fork part moves downward relative to the main frame of the vehicle, the auxiliary wheel group is extended downward relative to the main frame of the vehicle in the vertical direction; the head part of the vehicle is used to drive the load-bearing wheel group to rotate relative to the fork part to approach or move away from the fork part.

2. The pallet truck suitable for field support transportation according to claim 1 is characterized in that: The front part of the vehicle includes a driving system, which includes but is not limited to a driving wheel set, which is fixed to the main frame of the vehicle by screws, and the driving system is used to control the movement of the driving wheel set to drive the movement of the front part of the vehicle.

3. The pallet truck suitable for field support transportation according to claim 2 is characterized in that: The load-bearing wheel set is rotatably connected to the fork frame.

4. The pallet truck suitable for field support transportation according to claim 3 is characterized in that: The fork portion includes but is not limited to a load-bearing wheel follower mechanism and a latch, the latch being fixed to the fork frame, the latch extending in a vertical direction, and a downward end of the latch being provided with an inclined surface; The auxiliary wheel assembly includes but is not limited to an auxiliary wheel main frame, an inner frame, a roller, an elastic column pin, a torsion spring, a pin shaft, a pin shaft, an auxiliary wheel and an auxiliary wheel shaft; the auxiliary wheel main frame is fixed to the main frame of the vehicle, the inner frame and the auxiliary wheel main frame are connected by a pin shaft to form a hinge, and the inner frame can rotate relative to the auxiliary wheel main frame; one end of the torsion spring is pressed against the elastic column pin fixed to the inner frame, and the other end is pressed against the pin shaft fixed to the auxiliary wheel main frame; When the fork moves downward relative to the vehicle head, the inclined surface of the pin abuts against the roller and moves downward, driving the inner frame to rotate relative to the auxiliary wheel main frame, driving the auxiliary wheel to move downward; when the fork moves upward relative to the vehicle head, the inclined surface of the pin moves away from the roller, and the torsion spring drives the inner frame to rotate relative to the auxiliary wheel main frame, driving the auxiliary wheel to move upward.

5. The pallet truck suitable for field support transportation according to claim 4, characterized in that: The auxiliary wheel assembly includes but is not limited to the limit pin, which is arranged in the inner frame. When the torsion spring drives the inner frame to rotate relative to the auxiliary wheel main frame and drives the auxiliary wheel assembly to move upward until the auxiliary wheel shaft abuts against the limit pin, the limit pin limits the rotation of the inner frame relative to the auxiliary wheel main frame.

6. The pallet truck suitable for field support transportation according to claim 5, characterized in that: The drive system includes but is not limited to a main lifting cylinder, an auxiliary cylinder, a pin, a pin, a composite roller bearing, a channel frame, and a pin; A plurality of composite roller bearings are installed on the fork frame, and the composite roller bearings cooperate with the slot frame to form a sliding pair, and the fork frame can make up and down linear motion relative to the front main frame; one end of the main lifting cylinder forms a hinge with the fork frame through a pin shaft, and the other end forms a hinge with the front main frame, and the main lifting cylinder drives the fork frame to move relative to the main frame in the vertical direction; one end of the auxiliary cylinder forms a hinge with the front main frame through a pin shaft, and the other end of the auxiliary cylinder forms a hinge with the load-bearing wheel follower mechanism through a pin shaft, and the auxiliary cylinder is used to drive the load-bearing wheel follower mechanism to drive the load-bearing wheel group to rotate relative to the fork part to approach or move away from the fork part.

7. The pallet truck suitable for field support transportation according to claim 6, characterized in that: The load-bearing wheel follower mechanism includes but is not limited to a load-bearing wheel frame, a pin shaft, a connecting rod, a pin shaft, a pin shaft, a pin shaft, a pin shaft, a pin shaft and a swing rod; the lower end of the auxiliary oil cylinder forms a hinge with the swing rod through the pin shaft; the swing rod forms a hinge with the fork frame through the pin shaft; the connecting rod forms a hinge with the swing rod through the pin shaft; one end of the load-bearing wheel frame forms a hinge with the fork frame through the pin shaft; the middle part of the load-bearing wheel frame and the connecting rod form a hinge through the pin shaft; the load-bearing wheel frame forms a hinge with the load-bearing wheel set through the pin shaft; When the auxiliary oil cylinder is retracted, the swing arm rotates counterclockwise around the pin shaft, driving the load-bearing wheel set to rotate relative to the fork frame to move away from the fork frame to achieve extension; when the auxiliary oil cylinder is extended, the swing arm rotates clockwise around the pin shaft, driving the load-bearing wheel set to rotate relative to the fork frame to move closer to the fork frame to achieve retraction.

8. The pallet truck suitable for field support transportation according to claim 7, characterized in that: The number of the auxiliary oil cylinders is multiple.

9. The pallet truck suitable for field support transportation according to claim 7, characterized in that: The latch is fixed to the fork frame by screws.

10. The pallet truck suitable for field support transportation according to claim 7, characterized in that: The auxiliary wheel main frame is fixed to the vehicle main frame by screws.

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