Automatic loading and unloading device for semitrailer cargo transportation

Abstract

The invention relates to the technical field of loading and unloading equipment, in particular to an automatic loading and unloading device for semitrailer cargo transportation, which comprises a bottom plate, sliding grooves are symmetrically formed in the bottom plate, supporting rods are slidably arranged in the sliding grooves, fork rods are slidably arranged on the supporting rods, and lifting walkers are arranged on the fork rods; the lifting walking device comprises a plurality of guide grooves which are evenly distributed and formed in the fork rod, containing grooves corresponding to the guide grooves in a one-to-one mode are symmetrically formed in the two sides of the supporting rod and the two sides of the fork rod, a sliding frame is arranged in the guide grooves in a sliding mode, and guide wheels located in the containing grooves are rotationally arranged on the vertical section of the sliding frame. And the conveying direction of the conveying belt can be perpendicular to the conveying belt or form a certain angle with the conveying belt, so that the cargos at different positions can be conveniently treated, and the device can treat non-pallet cargos of various shapes, sizes and weights.

Description

Technical Field

[0001] This application relates to the technical field of loading and unloading equipment, and particularly to an automatic loading and unloading device for semi-trailer cargo transportation. Background Art

[0002] A semi-trailer is a common freight vehicle, consisting of a tractor and a semi-trailer, and is widely used in long-distance cargo transportation. The loading and unloading of semi-trailer cargo is a crucial link in the logistics transportation process, directly affecting transportation efficiency, cargo safety, and operating costs. Traditional semi-trailer loading and unloading methods mainly rely on manual labor and simple mechanical equipment, such as forklifts and cranes.

[0003] An automatic loading and unloading device is a device that realizes fast, efficient, and safe loading and unloading of goods through mechanization and automation technologies. Pallet transfer plays a crucial role in automatic loading and unloading. As a standardized cargo container tool, the pallet provides a convenient way to handle goods for the automatic loading and unloading device. The use of pallets makes the goods more standardized during the loading and unloading process. The automatic loading and unloading device can preset the size and shape of the pallet, thereby realizing precise grasping and placing operations.

[0004] For example, the pallet automatic loader with the application number CN202310821325.5 relates to the technical field of new energy for vehicles. In this prior art, a plurality of pallets are placed at intervals in the vertical direction on the placement rack. The conveying component includes two conveyor belts, and there is an accommodating space between the two conveyor belts. A plurality of supporting plates are arranged at intervals along the length extension direction of the rotating rack on the rotating rack, and the plurality of supporting plates are always in a horizontal state. The rotating rack is adapted to carry a plurality of pallets to rotate from the vertical direction towards the direction close to the conveyor belt, so that the rotating rack is received in the accommodating space, and then the plurality of pallets are placed on the two conveyor belts. The rotating rack is also adapted to carry a plurality of pallets to rotate from the direction close to the conveyor belt towards the vertical direction, so that the rotating rack disengages from the accommodating space, and then the plurality of pallets located on the conveyor belt can be conveyed into the placement rack. This invention is beneficial to efficiently take out the pallets from the placement rack or store the pallets on the placement rack.

[0005] However, there are still some defects in the above prior art when it comes to the automatic loading and unloading of semi-trailer cargo:

[0006] When loading goods in the above prior art, the pallet is transferred from the placement rack to the conveyor belt or from the conveyor belt to the placement rack through the conveying component. The conveying component includes a base frame and two synchronously operating conveyor belts, but the overall conveying component is fixed and installed on one side of the placement rack. Its base frame and two synchronously operating conveyor belts can only perform loading and unloading operations in place, which means that the position of the conveying component is preset and cannot be adjusted or moved according to actual loading and unloading requirements.

[0007] When a semi-trailer is loading or unloading cargo, the loading and unloading position may change due to factors such as the vehicle parking position, loading sequence, and cargo type. For example, the loading area of the semi-trailer may need to be adjusted according to the size and weight of the cargo, or the parking position of the semi-trailer may not be fully aligned with the conveying component due to site restrictions.

[0008] In addition, the interior of a general semi-trailer compartment is relatively deep, and the conveying assembly of the above-mentioned prior art can only penetrate a limited distance into the interior of the compartment, and is unable to remove the cargo pallet from the deep interior of the compartment.

[0009] Based on this, under the above-mentioned statement of view, the existing technology for automatic loading and unloading of semi-trailer cargo still has room for improvement. Summary of the invention

[0010] In order to solve the above technical problems, the present application provides an automatic loading and unloading device for semi-trailer cargo transportation, which adopts the following technical solutions:

[0011] An automatic loading and unloading device for semi-trailer cargo transportation comprises a bottom plate, the bottom plate is symmetrically provided with sliding grooves, a support rod is slidably arranged in the sliding groove, a fork rod is slidably arranged on the support rod, and a lifting walker is arranged on the fork rod;

[0012] The lifting walker includes a plurality of evenly distributed guide grooves on the fork rod, and receiving grooves corresponding to the guide grooves are symmetrically provided on both sides of the support rod and the fork rod, and a sliding frame is slidably arranged in the guide groove, and the sliding frame is in a "冂"-shaped structure with a horizontal section and two vertical sections;

[0013] The two vertical sections of the sliding frame are respectively located in the corresponding receiving grooves, and the vertical sections of the sliding frame are rotatably provided with guide wheels located in the receiving grooves.

[0014] Preferably, a return spring is arranged between the lower end of the horizontal section of the sliding frame and the bottom of the guide groove.

[0015] Preferably, a connecting groove corresponding to the guide groove is provided in the fork rod, an abutment bevel block located on one side of the sliding frame is slidably arranged in the connecting groove, a groove is provided on the horizontal section of the sliding frame, and a connecting rod is slidably arranged in the guide grooves of several sliding frames, the connecting rod is connected to several abutment bevel blocks, and the connecting rod is slidably passed through the fork rod.

[0016] Preferably, a guiding inclined block is commonly provided at one end of the support rod and the fork rod, and a guiding inclined surface corresponding to the guiding inclined block is provided at one end of the bottom plate.

[0017] Preferably, a receiving groove is provided in the fork rod, a transmission shaft is rotatably arranged in the receiving groove, a connecting guide block threadably connected to the transmission shaft is slidably arranged in the receiving groove, and one end of the connecting guide block is connected to one of the abutting bevel blocks.

[0018] Preferably, a conveyor belt is provided between the two ends of the fork rod.

[0019] Preferably, a push piece is provided on one side of the bottom plate;

[0020] The push piece includes a horizontal plate arranged on the side of the bottom plate away from the guiding inclined surface. The horizontal plate and the bottom plate are provided with a sliding groove. A sliding support plate is slidably arranged in the sliding groove. The sliding support plate is provided with a sliding guide groove corresponding to the sliding groove one by one. A push plate is slidably arranged in the sliding guide groove.

[0021] Preferably, a driving shaft is rotatably arranged in the sliding groove, the driving shaft slides and rotates through the sliding support plate, and the driving shaft is threadedly connected to the push plate.

[0022] Preferably, a conveyor belt is provided on the transverse plate, and the conveying direction of the conveyor belt is relatively perpendicular to the conveying direction of the transmission belt.

[0023] Preferably, the conveyor belt is provided with concave sections corresponding one to one with the sliding grooves, and the upper surface of the conveyor belt is not lower than the upper surface of the transverse plate.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. The fork rod of the present invention can be extended into different positions in the carriage to load and unload goods, adapting to different loading and unloading requirements. The conveying direction of the conveyor belt can be perpendicular to or at a certain angle to the conveyor belt, which is convenient for handling goods at different positions, so that the device can handle non-pallet goods of various shapes, sizes and weights.

[0026] 2. The present invention realizes the rapid loading and unloading of non-pallet goods through the conveyor belt and the automated transportation of the conveyor belt, as well as the mechanized operation of the fork rod. The conveyor belt can quickly transport the goods to the loading and unloading area, and the fork rod can then deliver the goods into the carriage or take them out of the carriage. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention.

[0028] Figure 2 It is a schematic diagram of the structure between the base plate and the lifting walker of the present invention.

[0029] Figure 3 It is a structural schematic diagram of the base plate of the present invention.

[0030] Figure 4 It is a structural schematic diagram of the lifting walking device of the present invention.

[0031] Figure 5 The present invention Figure 4 A partial enlarged view of point A.

[0032] Figure 6It is a cross-sectional view between the support rod and the fork rod of the present invention.

[0033] Figure 7 It is a schematic structural diagram of the sliding frame of the present invention.

[0034] Figure 8 It is a cross-sectional view of the lifting walker of the present invention.

[0035] Figure 9 It is a cross-sectional view between the connecting rod, the storage groove, the transmission shaft and the connecting guide block of the present invention.

[0036] Figure 10 It is a schematic structural diagram of the pressing member of the present invention.

[0037] Figure 11 It is a schematic structural diagram between the cross plate and the conveyor belt of the present invention.

[0038] Figure 12 It is a schematic structural diagram between the sliding pallet and the push plate of the present invention.

[0039] Explanation of reference numerals: 1, bottom plate; 11, sliding groove; 2, support rod; 3, fork rod; 31, guiding inclined block; 32, guiding inclined surface; 4, lifting walker; 41, guide groove; 42, receiving groove; 43, sliding frame; 431, horizontal section; 432, vertical section; 44, guide wheel; 45, return spring; 46, connecting groove; 461, abutting inclined block; 462, groove; 47, connecting rod; 48, storage groove; 481, transmission shaft; 482, connecting guide block; 49, conveyor belt; 5, pressing member; 51, cross plate; 52, sliding groove; 53, sliding pallet; 54, sliding guide groove; 55, push plate; 56, driving shaft; 57, conveyor belt; 58, concave section. Detailed implementation manners

[0040] The following is a further detailed description in conjunction with Figures 1 to 12 of the present application.

[0041] The embodiment of the present application discloses an automatic loading and unloading device for semi-trailer cargo transportation. Through precise sliding and pushing actions, it improves the accuracy and efficiency of pallet loading and unloading, and also enhances the automation degree and adaptability of the entire device.

[0042] Embodiment:

[0043] Refer to Figure 1 , Figure 2 and Figure 3As shown, an automatic loading and unloading device for semi-trailer cargo transportation includes a base plate 1, which is arranged on a track and can move between multiple loading and unloading stations. There is a certain height difference between each loading and unloading station and the ground, which can be achieved by digging a pit and then lifting the equipment. The base plate 1 is symmetrically provided with sliding grooves 11, and a support rod 2 is slidably arranged in the sliding groove 11, and a fork rod 3 is slidably arranged on the support rod 2.

[0044] When unloading the cargo from a semi-trailer, first the semi-trailer enters the loading and unloading station in a reverse manner, aligns the loading and unloading port of the carriage with the bottom plate 1, and the upper surface of the bottom plate 1 is flush with the bottom of the carriage. Then the lifting walker 4 arranged on the fork rod 3 drives the support rod 2 and the fork rod 3 to move into the carriage and insert them into the bottom of the cargo pallet. Then the lifting walker 4 drives the fork rod 3 to lift upward, lift the pallet, and make the bottom of the pallet break away from the contact with the bottom of the carriage.

[0045] Afterwards, the lifting walker 4 drives the support rod 2 and the fork rod 3 to move into the sliding groove 11, and brings the lifted pallet out of the carriage to complete the unloading of the goods. Each time, the two fork rods 3 can bring out a row of carriage goods, and each row of goods is unloaded in turn according to the number of rows of carriage goods.

[0046] On the contrary, when loading the goods, the lifting walker 4 drives the fork rod 3 to lift up, and the pallet loaded with the goods is placed on the fork rod 3, so that the fork rod 3 lifts the pallet, and then the lifting walker 4 drives the support rod 2 and the fork rod 3 to move into the car, and then the lifting walker 4 drives the fork rod 3 to be retracted to the support rod 2, and the pallet is placed in the car, and then the support rod 2 and the fork rod 3 withdraw from the car, and then the lifting walker 4 transports the pallets one by one to the pushing parts 5 set on one side of the bottom plate 1, and the pushing parts 5 will transport the pallets one by one to the inside of the warehouse, completing the loading of a row of goods.

[0047] Reference Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, specifically, the lifting walker 4 includes a plurality of evenly distributed guide grooves 41 formed on the fork rod 3, and receiving grooves 42 corresponding to the guide grooves 41 are symmetrically formed on both sides of the support rod 2 and the fork rod 3, and a sliding frame 43 is slidably arranged in the guide groove 41, and the sliding frame 43 is in a "冂"-shaped structure with a horizontal section 431 and two vertical sections 432, and the two vertical sections 432 of the sliding frame 43 are respectively located in the corresponding receiving grooves 42, and a guide wheel 44 located in the receiving groove 42 is rotatably arranged on the vertical section 432 of the sliding frame 43.

[0048] When unloading the goods of the semi-trailer, the guide wheels 44 are driven to rotate forward by the motor. A number of guide wheels 44 will drive the support rod 2 and the fork rod 3 to move into the carriage and insert into the bottom of the pallet. A connecting groove 46 corresponding to the guide groove 41 one by one is provided in the fork rod 3. A contact inclined block 461 located on one side of the sliding frame 43 is slidably arranged in the connecting groove 46. A groove 462 is provided on the horizontal section 431 of the sliding frame 43, and a receiving groove 48 is provided in the fork rod 3.

[0049] Referring to Figure 8 and Figure 9 As shown, after the support rod 2 and the fork rod 3 are inserted into the bottom of the pallet, the transmission shaft 481 rotatably arranged in the receiving groove 48 is driven to rotate by the motor. The rotating transmission shaft 481 will, through threaded connection, force the connecting guide block 482 slidably arranged in the receiving groove 48 to move. One end of the connecting guide block 482 is connected to one of the contact inclined blocks 461. The connecting guide block 482 will drive the contact inclined block 461 connected to it to move together. Since a connecting rod 47 is slidably arranged in the guide grooves 41 of a number of sliding frames 43 in common, the connecting rod 47 is connected to a number of contact inclined blocks 461, and the connecting rod 47 slidably penetrates through the fork rod 3.

[0050] A number of contact inclined blocks 461 will move together under the drive of the connecting rod 47. The inclined surface of the contact inclined block 461 will abut against the groove 462 provided on the horizontal section 431 of the sliding frame 43, causing the contact inclined block 461 of the sliding frame 43 to move upward. The contact inclined block 461 jacks up the fork rod 3 and compresses the return spring 45 arranged between the lower end of the horizontal section 431 of the sliding frame 43 and the bottom of the guide groove 41. The fork rod 3 jacks up the pallet upward, causing the bottom of the pallet to be separated from the contact with the bottom of the carriage. Subsequently, the motor drives the guide wheels 44 to rotate in reverse to make the support rod 2 and the fork rod 3 drive the pallet to withdraw from the carriage.

[0051] At this time, the conveyor belt 49 arranged between the two ends of the fork rod 3 is started, and the lifted pallet is conveyed towards the pressing member 5 arranged on one side of the bottom plate 1. The pressing member 5 will convey the pallets one by one into the interior of the warehouse to complete the loading of a row of goods. After that, the motor drives the transmission shaft 481 to rotate in reverse, forcing the connecting guide block 482 slidably arranged in the receiving groove 48 to move. The inclined surfaces of a number of contact inclined blocks 461 will be separated from abutting against the groove 462, causing the contact inclined block 461 of the sliding frame 43 to move downward, making the fork rod 3 retract into the support rod 2, and then repeating the above unloading operation for a row of goods.

[0052] When loading goods, a pusher 5 is provided on one side of the bottom plate 1 to transport the cargo pallet to the conveyor belt 49. The pusher 5 places a row of pallets between the two fork rods 3 in sequence. Then the motor drives the transmission shaft 481 to rotate, forcing the connecting guide block 482 slidingly provided in the storage groove 48 to move. The inclined surfaces of the abutting inclined blocks 461 abut against the grooves 462, so that the sliding frame 43 abuts against the inclined blocks 461 and moves upward. The abutting inclined blocks 461 push the fork rods 3 upward to lift the pallet. Then the motor drives the guide wheel 44 to rotate again, so that the support rod 2 and the fork rod 3 drive the pallet to move into the car. After the support rod 2 and the fork rod 3 drive the pallet to move into place, the motor drives the transmission shaft 481 to reverse, forcing the connecting guide block 482 slidingly set in the storage groove 48 to move, and the inclined surfaces of several abutting inclined blocks 461 will disengage from the abutment with the groove 462, so that the sliding frame 43 abuts the inclined block 461 and moves downward, so that the fork rod 3 is retracted into the support rod 2, thereby placing a row of pallets in the car.

[0053] A guiding bevel block 31 is provided at one end of the support rod 2 and the fork rod 3, and a guiding bevel surface 32 corresponding to the guiding bevel block 31 is provided at one end of the bottom plate 1. The slope shape of the guiding bevel block 31 enables the support rod 2 and the fork rod 3 to smoothly enter the car, avoiding impact and vibration caused by sudden contact or collision.

[0054] Reference Figure 10 , Figure 11 and Figure 12 As shown, specifically, the pushing member 5 includes a transverse plate 51 arranged on the side of the base plate 1 away from the guiding inclined surface 32, and a sliding groove 52 is provided on the transverse plate 51 and the base plate 1, and a sliding support plate 53 is slidably provided in the sliding groove 52, and the sliding support plate 53 is constructed with a sliding bar corresponding to the sliding groove 52 one by one, and the sliding guide groove 54 corresponding to the sliding groove 52 is provided on the sliding support plate 53 in the sliding groove 52 where the sliding bar is slidably provided, and the sliding guide groove 54 is provided on the sliding bar, and a plurality of pushing plates 55 are slidably provided in the sliding guide grooves 54.

[0055] When unloading the semi-trailer cargo, the fork rod 3 drives the pallet out of the car body and then the conveyor belt 49 starts. The conveyor belt 49 transports the pallet to the conveyor belt 57 arranged on the cross plate 51, and the conveying direction of the conveyor belt 57 is relatively perpendicular to the conveying direction of the conveyor belt 49. The pallet will enter the upper end of the conveyor belt 57, and then the conveyor belt 57 starts to transport the pallet to the warehouse for storage.

[0056] When loading goods, the conveyor belt 57 aligns the goods with the support rod 2 and the fork rod 3. Then, the driving shaft 56 rotatably arranged in the sliding groove 52 is driven to rotate by a motor. The driving shaft 56 slides and rotates through the sliding support plate 53. The rotating driving shaft 56 drives the push plate 55 to move on the sliding support plate 53 through a threaded connection with the push plate 55, pushing the pallet on the conveyor belt 57 onto the fork rod 3. Then, the fork rod 3 rises, and the pallet is conveyed forward by one pallet distance through the conveyor belt 49. After that, the fork rod 3 is retracted into the support rod 2. Subsequently, the push plate 55 pushes the next pallet between the two fork rods 3 again until a group of pallets is completely discharged.

[0057] The fork rod 3 jacks up the pallet upward, and the motor drives the guide wheel 44 to reverse, causing the support rod 2 and the fork rod 3 to drive the pallet into the carriage. During this process, the driving shaft 56 rotates, driving the push plate 55 to move to the extreme position in the sliding guide groove 54. Then, it abuts against the sliding support plate 53 to move into the carriage in the sliding groove 52 until it abuts against the carriage entrance, preventing the pallet from being touched and taken out when the fork rod 3 exits the carriage, which may affect the closing of the carriage door.

[0058] After the loading is completed, the motor drives the driving shaft 56 to reverse, causing the push plate 55 to move away from the carriage in the sliding guide groove 54. When the push plate 55 moves to the extreme position in the sliding guide groove 54, the push plate 55 continues to move, driving the sliding support plate 53 to move to the initial position. Then, the next group of goods loading operations is repeated.

[0059] Concave sections 58 corresponding to the sliding grooves 52 one by one are provided on the conveyor belt 57, and the upper surface of the conveyor belt 57 is not lower than the upper surface of the cross plate 51, so that the conveyor belt 57 does not affect the movement of the sliding support plate 53.

[0060] In the actual logistics and transportation process, not all goods are suitable for palletized handling. For example, some goods with irregular shapes, large volumes, or light weights may need to be directly loaded and unloaded.

[0061] The conveyor belt 49 can convey non-pallet goods from the warehouse or other storage areas to the loading and unloading area. The speed and direction of the conveyor belt 49 can be adjusted according to the type and quantity of the goods to ensure that the goods can be smoothly conveyed to the designated position. The fork rod 3 extends into the carriage to assist personnel or equipment in taking out the goods from the carriage and placing them on the fork rod 3.

[0062] With the auxiliary functions of the conveyor belt 49 and the conveyor belt 57, the fork rod 3 can handle non-pallet goods more quickly, reducing the need for manual handling and improving the loading and unloading efficiency. This function enables the device to handle various types of goods, including pallet goods and non-pallet goods, enhancing the adaptability and flexibility of the device.

[0063] Especially when unloading goods, in the absence of a pallet, the guiding bevel 31 can directly extend into the carriage, guide the bevel 31 to guide the goods into the upper end of the fork rod 3, and transport the goods to the outside of the carriage through the conveyor belt 49.

[0064] At the same time, the fork rod 3 can be extended into different positions in the carriage to load and unload goods, adapting to different loading and unloading requirements.

[0065] The implementation principle of the present invention is:

[0066] (1): When unloading the semi-trailer cargo, first the semi-trailer enters the loading and unloading station in a reverse manner, and aligns the loading and unloading port of the carriage with the bottom plate 1, so that the upper surface of the bottom plate 1 is flush with the bottom of the carriage.

[0067] (2): The guide wheel 44 is driven by a motor to rotate forward, and several guide wheels 44 will drive the support rod 2 and the fork rod 3 to move into the car and insert into the bottom of the pallet. The transmission shaft 481 will be connected by a thread, forcing the connecting guide block 482 slidingly set in the storage groove 48 to move, and one end of the connecting guide block 482 is connected to one of the abutting bevel blocks 461. The connecting guide block 482 will drive the abutting bevel block 461 connected to it to move together, and the abutting bevel block 461 will push the fork rod 3 upward, and the fork rod 3 will push the pallet upward, so that the bottom of the pallet is out of contact with the bottom of the car. Then, the motor drives the guide wheel 44 to reverse, so that the support rod 2 and the fork rod 3 drive the pallet out of the car.

[0068] (3): After the fork rod 3 drives the pallet out of the car, the conveyor belt 49 starts, and the conveyor belt 49 transports the pallet to the conveyor belt 57 set on the cross plate 51, and the conveying direction of the conveyor belt 57 is relatively perpendicular to the conveying direction of the conveyor belt 49. The pallet will enter the upper end of the conveyor belt 57, and then the conveyor belt 57 starts to transport the pallet to the warehouse for storage.

[0069] (4): When loading goods, the conveyor belt 57 will align the goods with the support rod 2 and the fork rod 3, and then the motor will drive the drive shaft 56 rotatably set in the sliding groove 52 to rotate, and the drive shaft 56 will slide and rotate through the sliding pallet 53. The rotating drive shaft 56 will drive the push plate 55 to move on the sliding pallet 53 through the threaded connection with the push plate 55, and push the pallet on the conveyor belt 57 onto the fork rod 3. Then the fork rod 3 will rise and the pallet will be transported forward a pallet distance through the conveyor belt 49. Then the fork rod 3 will be retracted into the support rod 2, and then the push plate 55 will push the next pallet between the two fork rods 3 again until a group of pallets is discharged.

[0070] (5): Subsequently, the motor drives the transmission shaft 481 to rotate, forcing the connecting guide block 482 slidably arranged in the receiving groove 48 to move. The inclined surfaces of several abutting inclined blocks 461 will abut against the groove 462, causing the abutting inclined blocks 461 of the sliding frame 43 to move upward. The abutting inclined blocks 461 jack up the fork rod 3 to lift the tray, and then the motor drives the guide wheel 44 to rotate again, causing the support rod 2 and the fork rod 3 to drive the tray to move into the carriage.

[0071] (6): After the support rod 2 and the fork rod 3 drive the tray to move in place, the motor drives the transmission shaft 481 to reverse, forcing the connecting guide block 482 slidably arranged in the receiving groove 48 to move. The inclined surfaces of several abutting inclined blocks 461 will disengage from the groove 462, causing the abutting inclined blocks 461 of the sliding frame 43 to move downward, and the fork rod 3 to retract into the support rod 2, thereby placing a row of trays in the carriage.

[0072] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention shall be covered within the protection scope of the present invention.

Claims

1. An automatic loading and unloading device for semi-trailer cargo transportation, including a bottom plate (1), and sliding grooves (11) are symmetrically formed on the bottom plate (1), and it is characterized in that: A support rod (2) is slidably arranged in the sliding groove (11), a fork rod (3) is slidably arranged on the support rod (2), and a lifting walker (4) is arranged on the fork rod (3); The lifting walking device (4) comprises a plurality of evenly distributed guide grooves (41) formed on the fork rod (3), receiving grooves (42) corresponding to the guide grooves (41) are symmetrically formed on both sides of the support rod (2) and the fork rod (3), a sliding frame (43) is slidably arranged in the guide groove (41), and the sliding frame (43) is in a "冂"-shaped structure with a horizontal section (431) and two vertical sections (432); The two vertical sections (432) of the sliding frame (43) are respectively located in the corresponding receiving grooves (42), and a guide wheel (44) located in the receiving groove (42) is rotatably arranged on the vertical section (432) of the sliding frame (43).

2. The automatic loading and unloading device for semi-trailer cargo transportation according to claim 1, characterized in that: A return spring (45) is arranged between the lower end of the horizontal section (431) of the sliding frame (43) and the bottom of the guide groove (41).

3. The automatic loading and unloading device for semi-trailer cargo transportation according to claim 1, characterized in that: The fork rod (3) is provided with a connecting groove (46) corresponding to the guide groove (41) one by one, and a contact inclined block (461) located on one side of the sliding frame (43) is slidably arranged in the connecting groove (46), and a groove (462) is arranged on the horizontal section (431) of the sliding frame (43), and a connecting rod (47) is slidably arranged in the guide grooves (41) of a plurality of sliding frames (43), and the connecting rod (47) is connected to a plurality of contact inclined blocks (461), and the connecting rod (47) is slidably arranged in the fork rod (3).

4. The automatic loading and unloading device for semi-trailer cargo transportation according to claim 1, characterized in that: A guide inclined block (31) is commonly provided at one end of the support rod (2) and the fork rod (3), and a guide inclined surface (32) corresponding to the guide inclined block (31) is provided at one end of the bottom plate (1).

5. The automatic loading and unloading device for semi-trailer cargo transportation according to claim 3, wherein: A receiving groove (48) is provided in the fork rod (3), a transmission shaft (481) is rotatably arranged in the receiving groove (48), a connecting guide block (482) threadedly connected to the transmission shaft (481) is slidably arranged in the receiving groove (48), and one end of the connecting guide block (482) is connected to one of the abutting inclined blocks (461).

6. The automatic loading and unloading device for semi-trailer cargo transportation according to claim 1, characterized in that: A conveyor belt (49) is arranged between the two ends of the fork rod (3).

7. An automatic loading and unloading device for semi-trailer cargo transportation according to claim 1, characterized in that: A pushing member (5) is provided on one side of the bottom plate (1); The push member (5) comprises a transverse plate (51) arranged on the side of the bottom plate (1) away from the guiding inclined surface (32); a sliding groove (52) is provided on the transverse plate (51) and the bottom plate (1); a sliding support plate (53) is slidably provided in the sliding groove (52); a sliding guide groove (54) corresponding to the sliding groove (52) is provided on the sliding support plate (53); and a push plate (55) is slidably provided in the sliding guide groove (54).

8. An automatic loading and unloading device for semi-trailer cargo transportation according to claim 7, characterized in that: A driving shaft (56) is rotatably arranged in the sliding groove (52). The driving shaft (56) slides and rotates through the sliding support plate (53), and the driving shaft (56) is threadedly connected to the push plate (55).

9. The automatic loading and unloading device for semi-trailer cargo transportation according to claim 7, characterized in that: A conveyor belt (57) is arranged on the transverse plate (51), and the conveying direction of the conveyor belt (57) is relatively perpendicular to the conveying direction of the conveyor belt (49).

10. The automatic loading and unloading device for semi-trailer cargo transportation according to claim 9, characterized in that: The conveyor belt (57) is provided with concave sections (58) corresponding to the sliding grooves (52) one by one, and the upper surface of the conveyor belt (57) is not lower than the upper surface of the transverse plate (51).

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