A fork structure and shuttle vehicle

Abstract

The present invention discloses a shift fork structure and a shuttle vehicle, wherein the shift fork structure includes a driving member, a first shift fork, a second shift fork, and a torsion spring, wherein one end of the first shift fork and one end of the second shift fork are movably connected, the driving end of the driving member is connected to the first shift fork, the torsion spring is sleeved between the first shift fork and the second shift fork, and one end of the torsion spring is fixedly connected to the first shift fork, and the other end of the torsion spring is fixedly connected to the second shift fork, the driving member can drive the first shift fork to rotate, and the rotating first shift fork can drive the second shift fork to rotate in the same direction at a differential speed through the torsion spring, so that the first shift fork and the second shift fork switch between a stacked state and a dispersed state with a preset angle. The shift fork structure is provided with the first shift fork and the second shift fork, and the two shift forks have a stacked state and a dispersed state. In the dispersed state, the two shift forks have a large contact area with the cargo box, and the pressure on the cargo box is small, so that the cargo box is not easily damaged when the cargo box is shifted. In the stacked state, the two shift forks are compact and occupy little space.

Description

Technical Field

[0001] The present invention relates to the technical field of storage equipment, and in particular to a shift fork structure and a shuttle vehicle. Background Art

[0002] A high-bay warehouse is a storage unit with shelves that are several, dozens, or even dozens of stories high. Because it can fully utilize the high-rise space to store cargo containers, high-bay warehouses play a significant role in logistics. Shuttles can move between the different levels of high-bay shelves, allowing cargo containers to be transferred between the warehouse and the shuttles.

[0003] The fork is a mechanism on a shuttle vehicle used to move cargo boxes. It can be used to move cargo boxes from a three-dimensional rack onto the shuttle vehicle's body, or vice versa. Existing forks are mostly single-pronged and undersized. Prolonged use of these forks can leave dents on the boxes. This is especially true when moving fragile boxes, such as cardboard boxes. The dents can be deep, even breaking through the box and penetrating the interior.

[0004] Therefore, how to propose a fork structure and shuttle car that are not easy to damage the cargo box is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] The first object of the present invention is to provide a fork structure that is not only simple and compact in structure, but also has a large contact area with the cargo box when shifting the cargo box, and generates less pressure on the fork, which is not easy to damage the cargo box.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A fork structure is used to be installed on a fork of a cargo picking device, and the fork structure includes: a driving member; a first fork and a second fork, one end of the first fork and one end of the second fork being movably connected, and the driving end of the driving member is connected to the first fork; a torsion spring, the torsion spring is arranged between the first fork and the second fork, and one end of the torsion spring is fixedly connected to the first fork, and the other end of the torsion spring is fixedly connected to the second fork; the driving member can drive the first fork to rotate, and the rotating first fork can drive the second fork to rotate in the same direction at a differential speed through the torsion spring, so that the first fork and the second fork can switch between a stacked state and a dispersed state with a preset angle.

[0008] Preferably, the first shift fork includes a first sleeve portion and a first lever portion connected to each other, the first sleeve portion includes a chassis and a plug-in column, and the plug-in column is protruded on the chassis; the second shift fork includes a second sleeve portion and a second lever portion connected to each other, the second sleeve portion is a ring structure, and the second sleeve portion is sleeved on the plug-in column.

[0009] Preferably, the first sleeve portion further includes a stop ring edge, which is arranged around the plug-in column, and a clearance opening is formed between the two ends of the stop ring edge. The first lever portion is connected to one end of the stop ring edge, and the second sleeve portion is located between the plug-in column and the stop ring edge, and the second lever portion is arranged through the clearance opening.

[0010] Preferably, the shift fork structure further includes a bushing, the bushing is sleeved on the plug-in column, and the second sleeve portion is sleeved on the bushing.

[0011] Preferably, the number of the bushings is two, each of the bushings includes a sleeve body and an annular flange, the annular flange is arranged around the circumference of the sleeve body and protrudes at one end of the sleeve body, the two sleeve bodies are arranged adjacent to each other, and the second sleeve connection portion is sleeved on the two sleeve bodies and is limited between the two annular flanges.

[0012] Preferably, the plug-in column includes a first column and a second column connected in a stepped manner, the diameter of the first column is larger than the diameter of the second column, the first column is connected to the chassis, the torsion spring is sleeved on the first column, and the bushing is sleeved on the second column.

[0013] Preferably, the fork structure further includes a mounting seat and a rotating shaft, the mounting seat is used to be fixed on the fork, the driving member is fixed on one side of the mounting seat, the rotating shaft is rotatably placed in the mounting seat, the driving shaft of the driving member is fixedly connected to one end of the rotating shaft, and the other end of the rotating shaft is inserted into the plug-in column.

[0014] Preferably, a first plug hole is provided through the plug column and the chassis, and a second plug hole is provided on one end of the rotating shaft; the driving member is a servo, the driving shaft of the servo is provided in the second plug hole, and the other end of the rotating shaft is provided in the first plug hole.

[0015] Preferably, the shift fork structure further includes a fastening screw and a pressing plate, the pressing plate is pressed against a side of the first shift fork away from the driving member, and the pressing plate is fixed to the other end of the rotating shaft by the fastening screw.

[0016] A second object of the present invention is to provide a shuttle vehicle that is less likely to lose a cargo box when transferring the cargo box and has high stability when transferring the cargo box.

[0017] To achieve this object, the present invention adopts the following technical solutions:

[0018] A shuttle vehicle comprises a cargo fork and the above-mentioned shift fork structure, wherein the shift fork structure is arranged on the cargo fork.

[0019] Beneficial effects of the present invention:

[0020] The shift fork structure provided by the present invention includes a driving member, a first shift fork, a second shift fork, and a torsion spring. One end of the first shift fork is movably connected to one end of the second shift fork. The driving end of the driving member is connected to the first shift fork. The torsion spring is disposed between the first shift fork and the second shift fork, with one end of the torsion spring fixedly connected to the first shift fork and the other end of the torsion spring fixedly connected to the second shift fork. The driving member can drive the first shift fork to rotate. The rotating first shift fork can drive the second shift fork to rotate in the same direction at a differential speed via the torsion spring, so that the first shift fork and the second shift fork can switch between a stacked state and a dispersed state at a preset angle. The shift fork structure is provided with two shift forks, the first shift fork and the second shift fork, and the two shift forks have a stacked state and a dispersed state. In the dispersed state, the two shift forks have a large contact area with the cargo box, exerting less pressure on the cargo box, and are less likely to damage the cargo box when shifting the cargo box. The two shift forks in the stacked state are compact and occupy a small space. Furthermore, the shift fork structure can achieve actuation of the two shift forks using only one driving member, which is an ingenious design. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 1 is a schematic structural diagram of a shift fork structure provided by an embodiment of the present invention;

[0022] Figure 2 is a cross-sectional view of a shift fork structure provided by an embodiment of the present invention;

[0023] Figure 3 yes Figure 2 Enlarged view of part A;

[0024] Figure 4 This is a schematic structural diagram of the shift fork structure provided by an embodiment of the present invention after the second shift fork, the fastening screw, and the pressing plate are removed;

[0025] Figure 5 1 is a schematic structural diagram of a first shift fork of a shift fork structure provided by an embodiment of the present invention at a certain viewing angle;

[0026] Figure 6 is a structural schematic diagram of the first shift fork of the shift fork structure provided by an embodiment of the present invention from another perspective;

[0027] Figure 72 is a schematic structural diagram of a second shift fork of the shift fork structure provided in an embodiment of the present invention;

[0028] Figure 8 2 is a schematic structural diagram of a torsion spring of a shift fork structure provided by an embodiment of the present invention;

[0029] Figure 9 This is a front view of the shuttle vehicle and cargo box provided by an embodiment of the present invention;

[0030] Figure 10 Schematic diagram of the structure of the shuttle provided by an embodiment of the present invention;

[0031] Figure 11 It is a schematic diagram of a partial structure of a shuttle vehicle provided by an embodiment of the present invention.

[0032] In the picture:

[0033] 1. Driving parts;

[0034] 2. First shift fork; 210. First sleeve portion; 201. Chassis; 202. Connecting post; 2021. First post; 2022. Second post; 203. Stop ring; 204. First connecting hole; 205. Third connecting hole; 220. First shift lever portion;

[0035] 3. Second shift fork; 310. Second sleeve portion; 311. Fourth plug hole; 320. Second shift lever portion;

[0036] 4. Torsion spring; 410. First plug-in rod; 420. Second plug-in rod;

[0037] 5. Clamping plate; 6. Fastening screw; 7. Mounting seat; 8. Rotating shaft; 9. Bearing; 10. Bushing;

[0038] 100. Fork structure;

[0039] 200, fork;

[0040] 300, cargo box;

[0041] 400. Track gasket. DETAILED DESCRIPTION

[0042] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0043] In the description of the present invention, it should be noted that the terms "center," "up," "down," "left," "right," "vertical," "horizontal," "inside," and "outside" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0044] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed or detachable connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention.

[0045] like Figures 1 to 11 As shown, this embodiment provides a fork structure 100 that can be installed on the fork 200 of a picking device. The fork structure 100 and the fork 200 cooperate with each other to achieve the shifting of the cargo box 300, thereby shifting the cargo box 300 located on the three-dimensional shelf to the body of the picking device, or shifting the cargo box 300 located on the body of the picking device to the target layer of the three-dimensional shelf. It should be noted that the picking device can be a shuttle, a stacker, or a multi-layer container robot. In this embodiment, for the convenience of describing the fork structure 100, the fork structure 100 is installed on the fork 200 of a shuttle as an example.

[0046] like Figures 1 to 4 As shown, the fork structure 100 includes a driving member 1, a first fork 2, a second fork 3 and a torsion spring 4. One end of the first fork 2 and one end of the second fork 3 are movably connected, and the driving end of the driving member 1 is connected to the first fork 2. Under the drive of the driving member 1, the first fork 2 can rotate around its rotation axis, and the rotation axis of the first fork 2 passes through the socketed portion of the first fork 2 and the second fork 3. The torsion spring 4 is sleeved between the first fork 2 and the second fork 3, and one end of the torsion spring 4 is fixedly connected to the first fork 2, and the other end of the torsion spring 4 is fixedly connected to the second fork 3. The first fork 2 and the second fork 3 are connected by the torsion spring 4, so that the first fork 2 in a rotating state can drive the second fork 3 to rotate in the same direction at a differential speed when rotating.

[0047] The driving member 1 is capable of driving the first shift fork 2 to rotate in a predetermined direction. The specific rotation direction can be changed as needed. In this embodiment, it is referred to as forward and reverse, with one representing clockwise and the other representing counterclockwise. The rotating first shift fork 2 can drive the second shift fork 3 to rotate in the same direction at a differential speed via the torsion spring 4, thereby switching the first and second shift forks 2, 3 between a stacked state and a dispersed state at a predetermined angle.

[0048] Specifically, the initial state of the first fork 2 and the second fork 3 is a stacked state in which they are stacked together and parallel to each other. The first fork 2 and the second fork 3 in the stacked state take up little space, are easy to store, and do not interfere with other components on the shuttle. When the fork structure 100 needs to shift the cargo box 300, the driving member 1 drives the first fork 2 to rotate in the forward direction. The forward-rotating first fork 2 can drive the second fork 3 to rotate in the forward direction through the torsion spring 4. Due to the structural characteristics of the torsion spring 4, the rotation speed of the second fork 3 is lower than the rotation speed of the first fork 2. Therefore, the first fork 2 and the second fork 3 can gradually separate from being parallel to each other, and the separation angle gradually increases until the first fork 2 and the second fork 3 separate to a preset angle. When the fork structure 100 completes the operation of shifting the cargo box 300, the driving member 1 drives the first fork 2 to rotate in the opposite direction. The reversely rotating first fork 2 can drive the second fork 3 to rotate in the opposite direction through the torsion spring 4. Due to the structural characteristics of the torsion spring 4, the rotation speed of the second fork 3 is lower than the rotation speed of the first fork 2. Therefore, the angle between the first fork 2 and the second fork 3 gradually decreases, and the first fork 2 and the second fork 3 gradually recover from the dispersed state to the stacked state.

[0049] Compared to the single-fork fork structure in the prior art, the fork structure 100 provided in this embodiment forms a double-fork structure by providing a first fork 2 and a second fork 3, and the state of the double-fork structure can be switched between a stacked state and a dispersed state as needed. The double-fork structure in the dispersed state has a large contact area with the cargo box 300, and the pressure on the cargo box 300 per unit area is small. When the cargo box 300 is shifted, it is not easy to form dents on the cargo box 300, and it is not easy to damage the cargo box 300 made of soft material. The double-fork structure in the stacked state is compact, occupies little space, is easy to store, and is not likely to interfere with other structures of the shuttle. In addition, the fork structure 100 can achieve the drive of the two forks with only one driving member 1. The design is ingenious, no additional power source is required, and it has a good energy-saving effect.

[0050] In some specific embodiments, such as Figure 5 and Figure 6As shown, the first shift fork 2 includes a first sleeve portion 210 and a first shift rod portion 220 connected to each other. The first sleeve portion 210 includes a chassis 201 and a plug-in post 202. The plug-in post 202 is protruded from the chassis 201. Figure 7 As shown, the second shift fork 3 includes a second connecting portion 310 and a second lever portion 320 that are interconnected. The second connecting portion 310 is an annular structure and is sleeved onto the plug post 202. The cooperation between the annular structure and the plug post 202 allows the first connecting portion 210 and the second connecting portion 310 to be sleeved together without affecting the gradual separation of the first and second lever portions 220 and 320. The central axis of the cooperation between the annular structure and the plug post 202 serves as the rotation axis of the first and second shift forks 2 and 3.

[0051] In some more specific embodiments, the first lever portion 220 and the second lever portion 320 are both long rods, the chassis 201 is a circular disc, one end of the first lever portion 220 is connected to the outer wall of the circular disc and extends along the tangential direction of the circular disc, the second sleeve portion 310 is a circular ring structure, one end of the second lever portion 320 is connected to the outer ring surface of the circular ring structure and extends along the tangential direction of the circular ring structure.

[0052] Furthermore, in order to limit the maximum angle at which the second fork 3 can rotate relative to the first fork 2, continue to refer to Figure 5 and Figure 6 As shown, the first sleeve portion 210 also includes a stop ring edge 203, which is arranged around the plug-in column 202, and an avoidance opening is formed between the two ends of the stop ring edge 203. The first lever portion 220 is connected to one end of the stop ring edge 203, and the second sleeve portion 310 is located between the plug-in column 202 and the stop ring edge 203, and the second lever portion 320 is arranged through the avoidance opening.

[0053] In the initial state, the second lever portion 320 and the first lever portion 220 are parallel and in contact with each other. When the second lever portion 320 rotates until the end of the stop ring 203 not connected to the first lever portion 220 contacts the end, the end stops the second lever portion 320, thereby preventing the angle between the second lever portion 320 and the first lever portion 220 from further increasing. Because the rotation axis of the first shift fork 2 and the rotation axis of the second shift fork 3 coincide, and the stop ring 203 is also an arc surface with this rotation axis as its center axis, the maximum angle that the second shift fork 3 can rotate relative to the first shift fork 2 can be limited by limiting the circular angle corresponding to the avoidance opening.

[0054] In some specific embodiments, in order to fix the entire fork structure 100 on the fork 200 of the shuttle, continue to refer to Figure 1 and Figure 2As shown, the fork structure 100 also includes a mounting seat 7 and a rotating shaft 8. The mounting seat 7 is used to be fixed on the fork 200, and the fixing method can be fixed by a connecting piece, welding or clamping. The driving member 1 is fixed on one side of the mounting seat 7, and the rotating shaft 8 is rotatably placed in the mounting seat 7. Specifically, a mounting hole is opened in the mounting seat 7 along the extension direction of the driving shaft of the driving member 1, and the rotating shaft 8 is rotatably connected in the mounting hole through two bearings 9. The driving shaft of the driving member 1 is fixedly connected to one end of the rotating shaft 8, and the other end of the rotating shaft 8 is inserted into the plug-in column 202 of the first fork 2. The driving member 1 can drive the rotating shaft 8 to rotate, and the rotation of the rotating shaft 8 can drive the first fork 2 to rotate.

[0055] To achieve the sequential connection between the drive body, the rotating shaft 8, and the first shift fork 2, a first insertion hole 204 is provided through the plug-in column 202 and the chassis 201, and a second insertion hole is provided on one end of the rotating shaft 8. The drive component 1 is a servo, which is a purchased component and consists of a motor and multiple reduction gears. The servo's drive shaft is inserted into the second insertion hole, and the other end of the rotating shaft 8 is inserted into the first insertion hole 204. In more specific embodiments, the servo's drive shaft is a hexagonal prism, and the second insertion hole is a hexagonal hole. In more specific embodiments, the first insertion hole 204 is a waist-shaped hole, and the other end of the rotating shaft 8 is shaped to match the waist-shaped hole. In more specific embodiments, the mounting hole is a stepped hole, and the rotating shaft 8 is a stepped shaft. One of the two bearings 9 is positioned between a stepped surface of the mounting hole and a stepped surface of the rotating shaft 8, while the other bearing 9 is positioned between the other stepped surface of the mounting hole and the retaining spring. This arrangement not only facilitates assembly but also ensures stable positioning.

[0056] Further, continue to refer to Figures 1 to 3 As shown, the shift fork structure 100 further includes a fastening screw 6 and a compression plate 5. The compression plate 5 presses against the side of the first shift fork 2 away from the driving member 1 and is fixed to the other end of the rotating shaft 8 via the fastening screw 6. The cooperation between the fastening screw 6 and the compression plate 5 can limit the position of the first shift fork 2 without affecting the rotation of the first shift fork 2 and the second shift fork 3.

[0057] Continue to refer to Figure 2 and Figure 3 As shown, the shift fork structure 100 further includes a bushing 10, which is sleeved on the plug post 202, and the second sleeve portion 310 is sleeved on the bushing 10. The provision of the bushing 10 can prevent direct contact between the first shift fork 2 and the second shift fork 3, thereby reducing wear caused by the mutual rotational contact between the first shift fork 2 and the second shift fork 3, and is conducive to increasing the service life of the first shift fork 2 and the second shift fork 3.

[0058] In some specific embodiments, the number of bushings 10 is two, and each bushing 10 includes a sleeve body and an annular flange. The annular flange is arranged around the circumference of the sleeve body and protrudes at one end of the sleeve body. The two sleeve bodies are arranged adjacent to each other, and the second sleeve connection portion 310 is sleeved on the two sleeve bodies and is limited between the two annular flanges.

[0059] The two symmetrically arranged bushings 10 can limit the position of the second sleeve portion 310. Furthermore, the compression piece 5 includes an extending portion and a flange portion connected in a stepped manner. The flange portion is larger than the extending portion. The extending portion extends into the first plug hole 204 and abuts against the end of the rotating shaft 8 extending into the first plug hole 204. The flange portion abuts against the plug post 202 and the bushing 10 located outside the plug post 202, thereby limiting the position of the bushing 10. That is, the axial position of the first shift fork 2 and the second shift fork 3 is limited by the compression piece 5, which is fixed by the fastening screw 6. The compression piece 5 compresses the first shift fork 2 while limiting the position of the bushing 10. The bushing 10 can also limit the position of the second shift fork 3.

[0060] In some more specific embodiments, continue to refer to Figure 5 and Figure 6 As shown, the plug-in column 202 includes a first column 2021 and a second column 2022 connected in a stepped manner. The diameter of the first column 2021 is larger than the diameter of the second column 2022. The first column 2021 is connected to the chassis 201, the torsion spring 4 is sleeved on the first column 2021, and the bushing 10 is sleeved on the second column 2022.

[0061] In order to fix the two ends of the torsion spring 4, as shown in FIG. Figure 6 and Figure 7 As shown, a third plug hole 205 is provided on the chassis 201, and a fourth plug hole 311 is provided on the second sleeve portion 310. Figure 8 As shown, the torsion spring 4 has a first plug rod 410 and a second plug rod 420 at both ends. The first plug rod 410 is inserted into the third plug hole 205, and the second plug rod 420 is inserted into the fourth plug hole 311, thereby fixing the torsion spring 4.

[0062] The shift fork structure 100 provided in this embodiment has the following advantages:

[0063] 1. The shift fork structure 100 adopts a double-fork design, which doubles the contact surface between the shift fork and the cargo box 300, reducing the unit area pressure at the contact position between the shift fork and the cargo box 300 when picking up and placing goods;

[0064] 2. The two shift forks will spread apart when in use, dispersing the pressure positions acting on the cargo box 300.

[0065] 3. The two shift forks are embedded together, and their positions are fixed, simple and reliable; the two shift forks can be swung apart to a certain angle, and the structure is extremely compact and ingenious, taking up little space and not changing the structure of the shuttle. The two shift forks do not require additional power to drive them apart or together.

[0066] like Figures 9 to 11 As shown, this embodiment further provides a shuttle vehicle, comprising a fork 200 and the aforementioned fork structure 100, with the fork structure 100 disposed on the fork 200. By utilizing the aforementioned fork structure 100, the shuttle vehicle is less likely to lose the cargo box 300 during transfer, and exhibits high stability during transfer. In some embodiments, a track pad 400 is disposed on the fork 200. The track pad 400 can serve as a component for determining the position of the second fork 200. When the second fork 200 contacts the track pad 400, it indicates that the second fork 200 is in a vertical position.

[0067] like Figure 9 and Figure 11 Shown are two working states of the fork structure 100. Figure 11 This is the stacked state of the first fork 2 and the second fork 3 of the fork structure 100 when they are retracted and not working. Figure 9 This is the dispersed state of the first fork 2 and the second fork 3 of the fork structure 100 when they are lowered for operation.

[0068] When the fork structure 100 is gradually retracted, the second fork 3 first touches the track gasket 400 provided on the cargo fork 200. At this time, the servo continues to operate, and the angle between the first fork 2 and the second fork 3 continues to decrease and move closer together until the angle is 0 degrees, that is, the first fork 2 and the second fork 3 are parallel; when the fork is gradually lowered, as the first fork 2 moves downward, the first fork 2 begins to form an angle with the second fork 3 under the action of the torsion spring 4, until the second fork 3 abuts against the annular rib, at which time the angle between the first fork 2 and the second fork 3 reaches its maximum.

[0069] The shuttle provided in this embodiment increases the contact area between the fork structure 100 and the cargo box 300. At the same time, the positions where the two forks contact the cargo box 300 are separated by a distance instead of simply being close to each other to increase the area. Such a structure can greatly reduce the dents on the cargo box 300 when taking and placing the plastic cargo box 300, and can prevent the carton from being hooked when taking and placing the original package of the carton, that is, prevent the fork from hooking the carton and squeezing it into the carton.

[0070] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A fork structure for mounting on a fork (200) of a picking device, characterized in that: The shift fork structure comprises: A driving member (1); a first shift fork (2) and a second shift fork (3), one end of the first shift fork (2) and one end of the second shift fork (3) being movably sleeved, and a driving end of the driving member (1) being connected to the first shift fork (2); a torsion spring (4), wherein the torsion spring (4) is sleeved between the first shift fork (2) and the second shift fork (3), and one end of the torsion spring (4) is fixedly connected to the first shift fork (2), and the other end of the torsion spring (4) is fixedly connected to the second shift fork (3); The driving member (1) is capable of driving the first shift fork (2) to rotate, and the rotating first shift fork (2) is capable of driving the second shift fork (3) to rotate in the same direction at a differential speed via the torsion spring (4), so that the first shift fork (2) and the second shift fork (3) can switch between a stacked state and a dispersed state with a preset angle. The shift fork structure and the cargo fork (200) cooperate with each other to achieve the shifting of the cargo box (300); The first shift fork (2) comprises a first sleeve portion (210) and a first shift rod portion (220) connected to each other, the first sleeve portion (210) comprises a chassis (201) and a plug-in column (202), and the plug-in column (202) is protruding from the chassis (201); The first sleeve portion (210) further comprises a stop ring edge (203), the stop ring edge (203) being arranged around the plug-in column (202), and a relief opening being formed between two ends of the stop ring edge (203).

2. The shift fork structure according to claim 1, characterized in that: The second shift fork (3) comprises a second sleeve portion (310) and a second shift rod portion (320) connected to each other, the second sleeve portion (310) being an annular structure, and the second sleeve portion (310) being sleeved on the plug-in column (202).

3. The shift fork structure according to claim 2, characterized in that: The first lever portion (220) is connected to one end of the stop ring edge (203), the second sleeve portion (310) is located between the plug-in column (202) and the stop ring edge (203), and the second lever portion (320) is arranged through the avoidance opening.

4. The shift fork structure according to claim 2, characterized in that: The shift fork structure further comprises a bushing (10), the bushing (10) being sleeved on the plug-in column (202), and the second sleeve portion (310) being sleeved on the bushing (10).

5. The shift fork structure according to claim 4, characterized in that: There are two bushings (10), each of which comprises a sleeve body and an annular flange. The annular flange is arranged around the circumference of the sleeve body and protrudes from one end of the sleeve body. The two sleeve bodies are arranged adjacent to each other, and the second sleeve connection portion (310) is sleeved on the two sleeve bodies and is limited between the two annular flanges.

6. The shift fork structure according to claim 4, characterized in that: The plug-in column (202) comprises a first column (2021) and a second column (2022) connected in a stepped manner, the diameter of the first column (2021) is larger than the diameter of the second column (2022), the first column (2021) is connected to the chassis (201), the torsion spring (4) is sleeved on the first column (2021), and the bushing (10) is sleeved on the second column (2022).

7. The shift fork structure according to claim 2, characterized in that: The fork structure further comprises a mounting seat (7) and a rotating shaft (8), wherein the mounting seat (7) is used to be fixed on the fork (200), the driving member (1) is fixed on one side of the mounting seat (7), the rotating shaft (8) is rotatably placed in the mounting seat (7), the driving shaft of the driving member (1) is fixedly connected to one end of the rotating shaft (8), and the other end of the rotating shaft (8) is inserted into the plug-in column (202).

8. The shift fork structure according to claim 7, characterized in that: A first plug hole (204) is provided through the plug column (202) and the chassis (201), and a second plug hole is provided on one end of the rotating shaft (8); the driving member (1) is a steering gear, the driving shaft of the steering gear is provided in the second plug hole, and the other end of the rotating shaft (8) is provided in the first plug hole (204).

9. The shift fork structure according to claim 7, characterized in that: The shift fork structure further comprises a fastening screw (6) and a pressing plate (5), wherein the pressing plate (5) is pressed against a side of the first shift fork (2) away from the driving member (1), and the pressing plate (5) is fixed to the other end of the rotating shaft (8) via the fastening screw (6).

10. A shuttle vehicle, characterized in that: It comprises a fork (200) and a fork structure according to any one of claims 1 to 9, wherein the fork structure is arranged on the fork (200).

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