Unloading device for automatic loading and unloading of containers

Abstract

The present invention discloses an unloading device for automatic loading and unloading of containers, which relates to the technical field of container loading and unloading, comprising a main cross bar and two loading and unloading carts, the two loading and unloading carts being slidably connected to the main cross bar, the two loading and unloading carts being symmetrically arranged on both sides of the main cross bar, the upper end of the main cross bar being provided with a connecting rod mechanism, the lower end of the main cross bar being provided with a front electric-controlled wheel, the connecting rod mechanism being connected to the two loading and unloading carts, each of the loading and unloading carts comprising a shifter and a lifting seat, a pair of rear electric-controlled wheels being installed on the lifting seat, a lifting mechanism being provided between the lifting seat and the shifter, a plurality of loading and unloading pins being installed in the shifter, a plurality of the loading and unloading pins being matched with the container hook, and the distance between the pair of loading and unloading carts is adjusted by mutual cooperation of the connecting rod mechanism and the rear electric-controlled wheels, thereby realizing the function of adapting to loading and unloading of containers of different widths.

Description

Technical Field

[0001] The present invention relates to the technical field of container loading and unloading, in particular to an unloading device for automatic loading and unloading of containers. Background Art

[0002] Whether at a terminal port, railway or highway hub, or a cargo distribution and transshipment center, the loading and unloading, distribution and scheduling of containers are the primary tasks. For a port or land transport hub, the site is open enough and there are sufficient conditions to use overhead cranes to load and unload containers. In addition, the cargo throughput of the first line is large, and there is a greater demand for large-tonnage cranes. Therefore, overhead cranes are the first choice. For transshipment centers in the second line, there is not enough space to build overhead crane units. Compared with empty terminals or hubs, the operators in the distribution center move more frequently. During the overhead lifting process, the containers will sway and shake, which will bring safety hazards and risks to the operators at the bottom. Therefore, multiple existing crane groups are often used to cooperate for loading and unloading operations. The resulting problems are still difficulties in coordination and cooperation, lack of flexibility in movement, and lack of engineering vehicles suitable for loading and unloading work in smaller spaces. Summary of the Invention

[0003] The object of the present invention is to provide a container unloading device for automatic loading and unloading, so as to solve the problems raised in the prior art.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a unloading device for automatic loading and unloading of containers, comprising a main cross bar and two loading and unloading vehicles, the two loading and unloading vehicles being slidably connected to the main cross bar, the two loading and unloading vehicles being symmetrically arranged on both sides of the main cross bar, the upper end of the main cross bar being provided with a connecting rod mechanism, the lower end of the main cross bar being provided with a front electrically-controlled wheel, the connecting rod mechanism being connected to the two loading and unloading vehicles, each of the loading and unloading vehicles comprising a shifter and a lifting seat, a pair of rear electrically-controlled wheels being installed on the lifting seat, a lifting mechanism being provided between the lifting seat and the shifter, a plurality of loading and unloading pins being installed in the shifter, and the plurality of loading and unloading pins being coordinated with the container hook.

[0005] Furthermore, the front electronically controlled wheel is connected to the main cross bar through a servo motor, and a sliding body is provided on the side of the loading and unloading vehicle body close to the main cross bar. The sliding body is slidably connected to the main cross bar, and the front electronically controlled wheel and the rear electronically controlled wheel drive the entire device to move. The servo motor drives the direction of the front electronically controlled wheel and the rear electronically controlled wheel to achieve the purpose of controlling the forward direction of the entire device.

[0006] Furthermore, the connecting rod mechanism includes a first electric push rod, an articulated head and a pair of connecting rods, the articulated head is installed on the piston rod of the first electric push rod, the pair of connecting rods are symmetrically rotated on both sides of the articulated head, and the other sides of the pair of connecting rods are rotatably connected to the two sliding bodies. When the first electric push rod pushes the articulated head upward, the articulated head pulls the pair of connecting rods upward, and the pair of connecting rods pull the sliding bodies closer to each other. Since the sliding body is connected to the loading and unloading vehicle body, the control system simultaneously controls the servo motor to adjust the direction of the rear electric control wheel, and cooperates with the movement direction of the sliding body to make the two loading and unloading vehicle bodies move away from each other; through the mutual cooperation of the connecting rod mechanism and the rear electric control wheel, the distance between the pair of loading and unloading vehicle bodies is adjusted, thereby achieving the function of adapting to the loading and unloading of containers of different widths.

[0007] Furthermore, chassis covers are installed at both ends of the lifting seat, servo motors are provided in the two chassis covers, a pair of rear electric control wheels are respectively connected to the servo motors in a pair of chassis covers, and the lifting mechanism is located between the pair of chassis covers.

[0008] Furthermore, the lifting mechanism includes a pair of bottom electric push rods, a partition plate and a pair of upper electric push rods. The pair of bottom electric push rods are arranged on the lifting seat, the partition plate is installed on the piston rod of the bottom electric push rod, and the pair of upper electric push rods are installed on the partition plate. The partition plate is rectangular serrated, and the pair of bottom electric push rods and the pair of upper electric push rods are arranged at intervals from each other.

[0009] Furthermore, the shifter is provided with an L-shaped steel plate, and the shifter is installed on the piston rod of the upper electric push rod through the L-shaped steel plate. After the loading and unloading pin is inserted into the lifting position of the container, the control system controls a pair of bottom electric push rods to push the partition plate upward, and the upper electric push rod, L-shaped steel plate and shifter on the partition plate are lifted at the same time to lift the container. The control system controls a pair of upper electric push rods to continue to lift the L-shaped steel plate upward, and the L-shaped steel plate drives the shifter to rise, and further lifts the container to realize the function of container loading and unloading. Through the setting of the partition plate, the volume can be controlled within a certain range after the unloading device is fully folded. Compared with traditional overhead lifting equipment, the present invention is smaller in size and more flexible in operation. It can avoid the container from shaking and being unstable after lifting. It is suitable for loading and unloading work in smaller spaces and is more economical and practical.

[0010] Furthermore, the several loading and unloading pins include a front pin, a first pin and a second pin. The front pin is slidably set at the end of the shifter away from the main cross bar, the first pin is slidably installed on the side of the shifter close to the main cross bar, and the second pin is slidably installed between the front pin and the first pin of the shifter. Limiting columns are set on the tops of the front pin, the first pin and the second pin.

[0011] Furthermore, the shifter is provided with a second electric push rod, a front shift plate, a rear shift plate, a linkage rod and a spring cylinder. The front shift plate is slidably mounted on one side of the shifter close to the front latch. A sliding groove is provided on the front shift plate. The limit column on the front latch is slidably arranged in the sliding groove of the front shift plate. In the initial state, the second electric push rod is in an ejected state, and the control system drives the piston rod of the second electric push rod to retract inward, and the rear shift plate and the linkage rod move at the same time. Since the linkage rod is connected to the front shift plate through the spring cylinder, the front shift plate also moves, and the front shift plate pushes the front latch out through the sliding groove. After the front latch cooperates with the container lifting point, the front shift plate cannot continue to move. Even if the linkage rod continues to move, the spring cylinder offsets the displacement of the linkage rod.

[0012] Furthermore, one end of the linkage rod is connected to the piston rod of the second electric push rod, and the spring tube is connected between the front shift plate and the linkage rod.

[0013] Furthermore, the rear shift plate is slidably mounted on a side of the shifter close to the main crossbar, and the piston rod of the second electric push rod is connected to the rear shift plate, and two sliding grooves are provided on the rear shift plate, and the limit columns on the first latch and the second latch are respectively slidably arranged in the two sliding grooves of the rear shift plate. When the rear shift plate just starts to move, the sliding groove will not push the first latch and the second latch to move, so the front latch is pushed out first, and then the first latch is also pushed out. If the length of the container is long, the first latch can adapt to the length of the container, and the second electric push rod will not continue to push the rear shift plate to move. At this time, the second latch will not be pushed out; if the length of the container is short, the first latch cannot adapt to the length of the container, and the second electric push rod continues to push the rear shift plate to move. At this time, the first latch retracts into the shifter, and the second latch is pushed out from the shifter, so that the second latch can adapt to the length of the container. Through the setting of the shifter, the three sets of unloading latches are extended in sequence, which are suitable for loading and unloading containers of different lengths, thereby improving the universal performance of the loading and unloading device.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] Through the cooperation of the connecting rod mechanism and the rear electric control wheel, the distance between a pair of loading and unloading bodies is adjusted to adapt to the loading and unloading of containers of different widths; through the setting of the partition plate, the volume can be controlled within a certain range after the unloading device is fully folded. Compared with traditional overhead crane equipment, the present invention is smaller in size and more flexible in operation. It can avoid the unstable shaking of the container after lifting, and is suitable for loading and unloading work in smaller spaces, which is more economical and practical; through the setting of the gear shifter, the three groups of unloading pins are extended in sequence, which is suitable for loading and unloading containers of different lengths, thereby improving the universal performance of the loading and unloading device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The overall appearance structure of the present invention is shown in FIG. Figure 1 ;

[0017] Figure 2 The overall appearance structure of the present invention is shown in FIG. Figure 2 ;

[0018] Figure 3 It is a partial structural schematic diagram of the present invention;

[0019] Figure 4 Schematic diagram of the loading and unloading vehicle structure of the present invention Figure 1 ;

[0020] Figure 5 Schematic diagram of the loading and unloading vehicle structure of the present invention Figure 2 ;

[0021] Figure 6 Schematic diagram of the internal structure of the shifter of the present invention;

[0022] Figure 7 It is a partial structural schematic diagram of the shifter of the present invention;

[0023] Figure 8 It is a structural schematic diagram of the lifting seat part of the present invention.

[0024] In the figure: 1. Main cross bar; 2. Loading and unloading body; 3. Front electric control wheel; 4. First electric push rod; 5. Articulated joint; 6. Connecting rod; 7. Sliding body; 8. Shifter; 9. L-shaped steel plate; 10. Lifting seat; 11. Rear electric control wheel; 12. Bottom electric push rod; 13. Partition plate; 14. Upper electric push rod; 15. Servo motor; 16. Chassis cover; 17. Second electric push rod; 18. Front shift plate; 19. Rear shift plate; 20. Linkage rod; 21. Spring cylinder; 22. Front latch; 23. First latch; 24. Second latch. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] Example: Figures 1-8 As shown, the present invention provides a technical solution, a unloading device for automatic loading and unloading of containers, comprising a main cross bar 1 and two loading and unloading bodies 2, the two loading and unloading bodies 2 being slidably connected to the main cross bar 1, the two loading and unloading bodies 2 being symmetrically arranged on both sides of the main cross bar 1, the upper end of the main cross bar 1 being provided with a connecting rod mechanism, the lower end of the main cross bar 1 being provided with a front electric-controlled wheel 3, the connecting rod mechanism being connected to the two loading and unloading bodies 2, each loading and unloading body 2 comprising a shifter 8 and a lifting seat 10, a pair of rear electric-controlled wheels 11 being installed on the lifting seat 10, a lifting mechanism being provided between the lifting seat 10 and the shifter 8, a plurality of loading and unloading pins being installed in the shifter 8, and the plurality of loading and unloading pins being coordinated with the container hook.

[0027] The front electrically-controlled wheel 3 is connected to the main cross bar 1 through a servo motor 15. A sliding body 7 is provided on the side of the loading and unloading vehicle body 2 close to the main cross bar 1. The sliding body 7 is slidably connected to the main cross bar 1. The connecting rod mechanism includes a first electric push rod 4, an articulated head 5 and a pair of connecting rods 6. The articulated head 5 is installed on the piston rod of the first electric push rod 4. A pair of connecting rods 6 are symmetrically connected on both sides of the articulated head 5. The other sides of a pair of connecting rods 6 are rotatably connected to the two sliding bodies 7 respectively. The front electrically-controlled wheel 3 and the rear electrically-controlled wheel 11 drive the entire device to move. The servo motor 15 drives the direction of the front electrically-controlled wheel 3 and the rear electrically-controlled wheel 11 to control the forward direction of the entire device. When the first electric push rod 4 pushes the articulated head 5 upward, the articulated head 5 pushes the pair of connecting rods 6 to Pulling up, a pair of connecting rods 6 pull the sliding bodies 7 closer to each other. Since the sliding body 7 is connected to the loading and unloading body 2, the control system simultaneously controls the servo motor 15 to adjust the direction of the rear electric control wheel 11, and cooperates with the movement direction of the sliding body 7 to make the two loading and unloading bodies 2 approach each other; when the first electric push rod 4 lowers the articulated head 5, the articulated head 5 pulls down a pair of connecting rods 6, and a pair of connecting rods 6 push the sliding bodies 7 away from each other, and the control system simultaneously controls the servo motor 15 to adjust the direction of the rear electric control wheel 11, and cooperates with the movement direction of the sliding body 7 to make the two loading and unloading bodies 2 move away from each other; through the mutual cooperation of the connecting rod mechanism and the rear electric control wheel 11, the distance between the pair of loading and unloading bodies 2 is adjusted, thereby realizing the function of adapting to the loading and unloading of containers of different widths.

[0028] Chassis covers 16 are installed at both ends of the lifting seat 10, and servo motors 15 are provided in the two chassis covers 16. A pair of rear electronically controlled wheels 11 are respectively connected to the servo motors 15 in the pair of chassis covers 16. The lifting mechanism is located between the pair of chassis covers 16. The lifting mechanism includes a pair of bottom electric push rods 12, a partition plate 13 and a pair of upper electric push rods 14. The pair of bottom electric push rods 12 are arranged on the lifting seat 10, and the partition plate 13 is installed on the piston rod of the bottom electric push rod 12. A pair of upper electric push rods 14 are installed on the partition plate 13. The partition plate 13 is rectangular and serrated. The pair of bottom electric push rods 12 and the pair of upper electric push rods 14 are arranged at intervals from each other. An L-shaped steel plate 9 is provided on the shifter 8. The shifter 8 is installed on the active part of the upper electric push rod 14 through the L-shaped steel plate 9. After the loading and unloading pins on the plug rod are inserted into the lifting position of the container, the control system controls a pair of bottom electric push rods 12 to push the partition plate 13 upwards, and the upper electric push rods 14, L-shaped steel plate 9 and shifter 8 on the partition plate 13 are lifted at the same time to lift the container, and the control system controls a pair of upper electric push rods 14 to continue to lift the L-shaped steel plate 9 upwards, and the L-shaped steel plate 9 drives the shifter 8 to rise, further lifting the container to realize the function of container loading and unloading. Through the setting of the partition plate 13, the volume can be controlled within a certain range after the unloading device is completely folded up. Compared with traditional overhead lifting equipment, the present invention is smaller in size and more flexible in operation. It can avoid the container from shaking and being unstable after lifting. It is suitable for loading and unloading work in smaller spaces and is more economical and practical.

[0029] Several loading and unloading latches include a front latch 22, a first latch 23 and a second latch 24. The front latch 22 is slidably arranged at the end of the shifter 8 away from the main cross bar 1, the first latch 23 is slidably installed on the side of the shifter 8 close to the main cross bar 1, and the second latch 24 is slidably installed between the front latch 22 and the first latch 23 of the shifter 8. Limiting columns are provided on the tops of the front latch 22, the first latch 23 and the second latch 24. A second electric push rod 17, a front shift plate 18, a rear shift plate 19, a linkage rod 20 and a spring cylinder 21 are provided inside the shifter 8. The front shift plate 18 is slidably installed on the side of the shifter 8 close to the front latch 22. A slide groove is provided on 18, and the limit column on the front latch 22 is slidably set in the slide groove of the front shift plate 18. In the initial state, the second electric push rod 17 is in the ejected state, and the control system drives the piston rod of the second electric push rod 17 to retract inward, and the rear shift plate 19 and the linkage rod 20 move at the same time. Since the linkage rod 20 is connected to the front shift plate 18 through the spring tube 21, the front shift plate 18 also moves, and the front shift plate 18 pushes the front latch 22 out through the slide groove. After the front latch 22 cooperates with the container lifting point, the front shift plate 18 cannot continue to move. Even if the linkage rod 20 continues to move, the spring tube 21 offsets the displacement of the linkage rod 20.

[0030] One end of the linkage rod 20 is connected to the piston rod of the second electric push rod 17, and the spring cylinder 21 is connected between the front shift plate 18 and the linkage rod 20. The rear shift plate 19 is slidably installed on the side of the shifter 8 close to the main cross bar 1. The piston rod of the second electric push rod 17 is connected to the rear shift plate 19. Two slide grooves are provided on the rear shift plate 19. The limit columns on the first latch 23 and the second latch 24 are respectively slidably set in the two slide grooves of the rear shift plate 19. When the rear shift plate 19 starts to move, the slide groove will not push the first latch 23 and the second latch 24 to move. Therefore, the front latch 22 is ejected first, and then the first latch 23 is also ejected. If the container If the container is long, the first latch 23 can adapt to the length of the container, and the second electric push rod 17 will not continue to push the rear shift plate 19 to move, and the second latch 24 will not be pushed out at this time; if the container is short, the first latch 23 cannot adapt to the length of the container, and the second electric push rod 17 continues to push the rear shift plate 19 to move. At this time, the first latch 23 retracts into the shifter 8, and the second latch 24 is pushed out from the shifter 8, so that the second latch 24 can adapt to the length of the container. Through the setting of the shifter 8, the three groups of unloading pins are extended in sequence to adapt to the loading and unloading of containers of different lengths, thereby improving the universal performance of the loading and unloading device.

[0031] The working principle of the present invention is as follows: the front electric-controlled wheels 3 and the rear electric-controlled wheels 11 drive the entire device to move, and the servo motor 15 drives the direction of the front electric-controlled wheels 3 and the rear electric-controlled wheels 11 to control the forward direction of the entire device. When the first electric push rod 4 pushes the hinge head 5 upward, the hinge head 5 pulls the pair of connecting rods 6 upward, and the pair of connecting rods 6 pull the sliding bodies 7 closer to each other. Since the sliding body 7 is connected to the loading and unloading vehicle body 2, the control system simultaneously controls the servo motor 15 to rotate the direction of the rear electric-controlled wheels 11, and cooperates with the movement direction of the sliding body 7 to make the two loading and unloading vehicles 2 move closer to each other; when the first electric push rod 4 lowers the hinge head 5, the hinge head 5 pulls the pair of connecting rods 6 downward, and the pair of connecting rods 6 push the sliding bodies 7 apart from each other, and the control system simultaneously controls the servo motor 15 to rotate the direction of the rear electric-controlled wheels 11, and cooperates with the movement direction of the sliding body 7 to make the two loading and unloading vehicles 2 move away from each other; through the cooperation between the connecting rod mechanism and the rear electric-controlled wheels 11, the distance between the pair of loading and unloading vehicles 2 is adjusted, thereby achieving the function of adapting to the loading and unloading of containers of different widths.

[0032] After the loading and unloading pin is inserted into the lifting position of the container, the control system controls a pair of bottom electric push rods 12 to push the partition plate 13 upward, and the upper electric push rod 14, L-shaped steel plate 9 and shifter 8 on the partition plate 13 are lifted at the same time to lift the container. The control system controls a pair of upper electric push rods 14 to continue to lift the L-shaped steel plate 9 upward, and the L-shaped steel plate 9 drives the shifter 8 to rise, further lifting the container to realize the function of container loading and unloading. Through the setting of the partition plate 13, the volume can be controlled within a certain range after the unloading device is fully folded. Compared with traditional overhead lifting equipment, the present invention is smaller in size and more flexible in operation. It can avoid the container from shaking and being unstable after lifting. It is suitable for loading and unloading work in smaller spaces and is more economical and practical.

[0033] In the initial state, the second electric push rod 17 is in the ejected state, and the control system drives the piston rod of the second electric push rod 17 to retract inward, and the rear shift plate 19 and the linkage rod 20 move at the same time. Since the linkage rod 20 is connected to the front shift plate 18 through the spring tube 21, the front shift plate 18 also moves, and the front shift plate 18 pushes out the front pin 22 through the slide groove. After the front pin 22 cooperates with the container lifting point, the front shift plate 18 cannot continue to move. Even if the linkage rod 20 continues to move, the spring tube 21 offsets the displacement of the linkage rod 20.

[0034] When the rear shift plate 19 just starts to move, the slide slot will not push the first latch 23 and the second latch 24 to move, so the front latch 22 is pushed out first, and then the first latch 23 is also pushed out. If the container is longer, the first latch 23 can adapt to the length of the container, and the second electric push rod 17 will not continue to push the rear shift plate 19 to move, and the second latch 24 will not be pushed out; if the container is shorter, the first latch 23 cannot adapt to the length of the container, and the second electric push rod 17 continues to push the rear shift plate 19 to move. At this time, the first latch 23 retracts into the shifter 8, and the second latch 24 is pushed out from the shifter 8, so that the second latch 24 can adapt to the length of the container. Through the setting of the shifter 8, the three groups of unloading latches are extended in sequence, which are suitable for loading and unloading containers of different lengths, thereby improving the universal performance of the loading and unloading device.

[0035] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A container unloading device for automated loading and unloading, characterized in that: The utility model comprises a main cross bar (1) and two loading and unloading vehicles (2), the two loading and unloading vehicles (2) are slidably connected to the main cross bar (1), the two loading and unloading vehicles (2) are symmetrically arranged on both sides of the main cross bar (1), the upper end of the main cross bar (1) is provided with a connecting rod mechanism, the lower end of the main cross bar (1) is provided with a front electric control wheel (3), the connecting rod mechanism is connected to the two loading and unloading vehicles (2), each of the loading and unloading vehicles (2) comprises a shifter (8) and a lifting seat (10), a pair of rear electric control wheels (11) are installed on the lifting seat (10), a lifting mechanism is provided between the lifting seat (10) and the shifter (8), a plurality of loading and unloading pins are installed in the shifter (8), and the plurality of loading and unloading pins cooperate with the container hook; The plurality of loading and unloading latches include a front latch (22), a first latch (23) and a second latch (24), and the tops of the front latch (22), the first latch (23) and the second latch (24) are all provided with limiting columns; The shifter (8) is provided with a second electric push rod (17), a front shift plate (18), a rear shift plate (19), a linkage rod (20) and a spring cylinder (21). The front shift plate (18) is slidably mounted on a side of the shifter (8) close to the front latch (22). A sliding groove is provided on the front shift plate (18). The limit column on the front latch (22) is slidably mounted in the sliding groove of the front shift plate (18). One end of the linkage rod (20) is connected to the piston rod of the second electric push rod (17), and the spring cylinder (21) is connected between the front shift plate (18) and the linkage rod (20); The rear shift plate (19) is slidably mounted on a side of the shifter (8) close to the main crossbar (1); the piston rod of the second electric push rod (17) is connected to the rear shift plate (19); two sliding grooves are provided on the rear shift plate (19); the limiting columns on the first latch (23) and the second latch (24) are respectively slidably mounted in the two sliding grooves of the rear shift plate (19).

2. The unloading device for automated loading and unloading of containers according to claim 1, characterized in that: The front electrically controlled wheel (3) is connected to the main cross bar (1) via a servo motor (15); a sliding body (7) is provided on one side of the loading and unloading vehicle body (2) close to the main cross bar (1); and the sliding body (7) is slidably connected to the main cross bar (1).

3. The unloading device for automated loading and unloading of containers according to claim 2, characterized in that: The connecting rod mechanism comprises a first electric push rod (4), an articulated joint (5) and a pair of connecting rods (6), wherein the articulated joint (5) is mounted on the piston rod of the first electric push rod (4), the pair of connecting rods (6) are symmetrically connected to both sides of the articulated joint (5), and the other sides of the pair of connecting rods (6) are respectively rotatably connected to two sliding bodies (7).

4. The unloading device for automated loading and unloading of containers according to claim 1, characterized in that: Both ends of the lifting seat (10) are equipped with chassis covers (16), and servo motors (15) are provided in the two chassis covers (16). The pair of rear electric control wheels (11) are respectively connected to the servo motors (15) in the pair of chassis covers (16), and the lifting mechanism is located between the pair of chassis covers (16).

5. The unloading device for automatic loading and unloading of containers according to claim 4, characterized in that: The lifting mechanism comprises a pair of bottom electric push rods (12), a partition plate (13) and a pair of upper electric push rods (14); the pair of bottom electric push rods (12) are arranged on the lifting seat (10); the partition plate (13) is mounted on the piston rods of the bottom electric push rods (12); the pair of upper electric push rods (14) are mounted on the partition plate (13); the partition plate (13) is in a rectangular sawtooth shape; the pair of bottom electric push rods (12) and the pair of upper electric push rods (14) are arranged at intervals from each other.

6. The unloading device for automatic loading and unloading of containers according to claim 5, characterized in that: An L-shaped steel plate (9) is provided on the shifter (8), and the shifter (8) is mounted on the piston rod of the upper electric push rod (14) through the L-shaped steel plate (9).

7. The unloading device for automatic loading and unloading of containers according to claim 4, characterized in that: The front latch (22) is slidably mounted on an end of the shifter (8) away from the main crossbar (1), the first latch (23) is slidably mounted on a side of the shifter (8) close to the main crossbar (1), and the second latch (24) is slidably mounted between the front latch (22) and the first latch (23) of the shifter (8).

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