CN219806861U

CN219806861U - Electric cargo transportation device capable of crossing threshold

Info

Publication number: CN219806861U
Application number: CN202321280813.1U
Authority: CN
Inventors: 周顺祥
Original assignee: Chengdu Chengzhong Metal Products Co ltd
Current assignee: Chengdu Chengzhong Metal Products Co ltd
Priority date: 2023-05-25
Filing date: 2023-05-25
Publication date: 2023-10-10
Anticipated expiration: 2033-05-25

Abstract

The utility model discloses an electric cargo transportation device capable of crossing a threshold, and relates to the field of cargo transportation. The utility model comprises a bearing mechanism, a control mechanism and a movement mechanism; the bearing mechanism comprises a bearing plate and a storage cavity, and the storage cavity is fixedly arranged at the bottom of the bearing plate; the motion mechanism is arranged at the bottom of the bearing plate and can reciprocate along the vertical direction; the transport device further comprises a telescopic bridge mechanism which is detachably arranged in the storage cavity. According to the utility model, the telescopic bridge frame mechanism paved on the threshold is utilized, so that the device can automatically cross the threshold without carrying goods or lifting the device by an operator, time and labor are saved, and the safety of the operator and the goods can be ensured.

Description

Electric cargo transportation device capable of crossing threshold

Technical Field

The utility model relates to the field of cargo transportation, in particular to an electric cargo transportation device capable of crossing a threshold.

Background

With the increasing demands of people for quality of life, the frequency and time for purchasing furniture and finishing are increasing, and as the entrance doors of most residential buildings are provided with threshold, finishing materials or furniture and other heavier goods sent by the purchasing or selling houses need to be lifted in from the entrance doors.

To this kind of freight transportation scene, traditional manual handling mode and consume the manpower, and receive cargo weight influence, very easily take place to empty and fall in the handling to lead to handling personnel to be injured or the goods damages.

Disclosure of Invention

The present utility model is directed to an electric cargo transportation device capable of crossing a threshold, so as to solve the above-mentioned problems in the prior art.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

an electric cargo transportation device capable of crossing a threshold comprises a bearing mechanism, a control mechanism and a movement mechanism; the bearing mechanism comprises a bearing plate for bearing goods and a storage cavity, and the storage cavity is fixedly arranged at the bottom of the bearing plate; the motion mechanism is arranged at the bottom of the bearing plate and can reciprocate along the vertical direction;

the transporter further includes a telescoping bridge mechanism for the support device to clear the obstacle, the telescoping bridge mechanism being removably positioned in the storage cavity.

The telescopic bridge mechanism comprises a bridge plate, a supporting frame and a telescopic connecting pipe; the support frame is of a vertical structure and comprises a transverse pipe and an upright post, one end part of the transverse pipe is fixedly connected with one end part of the upright post, and the connecting end of the support frame and the side wall of the dispersing end are connected with the end parts of the telescopic connecting pipes; the telescopic connecting pipe comprises an inner telescopic pipe and outer telescopic pipes, wherein the number of the outer telescopic pipes is two, and the two outer telescopic pipes are symmetrically and slidably sleeved at two ends of the inner telescopic pipe; the bridge plate comprises an inclined plate, and the side wall of the outer extension at the divergence end and the end part at the upright post divergence end are fixedly connected with the inclined plate; the storage cavity is provided with a hinge door for preventing the telescopic bridge mechanism from falling off the storage cavity.

The number of the supporting frames is two, and the supporting frames are symmetrically arranged at two ends of the outer extension; the stand column close to one side of the inner telescopic pipe is a bending stand column, and the bending stand column is fixedly connected with the inclined plate through a jacking pipe which bypasses the outer telescopic pipe.

The number of the telescopic bridge frame mechanisms is two; the bridge plate further comprises a top plate used for connecting the two telescopic bridge mechanisms, and the top plate is integrally connected with the inclined plate; the top plate is fixedly connected with the side wall of the outer extension of the side, close to the upright post, of the divergent end and the end part of the divergent end of the upright post.

The bottom of the transverse tube is provided with a ground sucking structure for enhancing the ground adsorption force, and the ground sucking structure is a sucker.

The motion mechanism comprises wheels, a wheel frame, a lifter and a first motor, wherein one end of the lifter is fixedly arranged at the bottom of the bearing plate, and the other end of the lifter is connected with the wheels through the wheel frame; the lifter is a hydraulic jack and is driven by a first motor; the wheels are electric self-driven wheels.

The control mechanism comprises an infrared sensing device, a laser positioning device and a controller; the infrared sensing device is arranged on the side wall around the bearing plate; the laser positioning device is arranged on the side wall of one side of the bearing plate far away from the hinge door; the signal input end of the controller is connected with the infrared sensing device and the laser positioning device, and the signal output end of the controller is connected with the first motor and the electric self-driven wheel.

The side wall of one side of the bearing plate is provided with a tower crane type mechanical arm for loading and unloading cargoes, the tower crane type mechanical arm comprises a grabbing part, a displacement part and a fixing part, and the displacement part is rotatably arranged on the fixing part; the displacement part comprises a telescopic rod, a swing arm and a longitudinal screw rod, one end of the telescopic rod is fixedly arranged on the fixed part, the other end of the telescopic rod is rotationally connected with the swing arm, and a gear disc for the swing arm to rotate is arranged at the joint of the telescopic rod and the swing arm; the swing arm is provided with a transverse guide rail, the longitudinal screw rod is provided with a screw rod sleeve for the longitudinal screw rod to move along the vertical direction, and the screw rod sleeve is in sliding connection with the swing arm through the transverse guide rail; the grabbing part is detachably arranged at one end part of the longitudinal screw rod far away from the swing arm; the fixing part comprises a connecting plate and a bearing plate, the telescopic rod is fixedly connected to the connecting plate, one end of the connecting plate is hinged with the bearing plate, and the other end of the connecting plate is detachably connected with the bearing plate through a high-strength bolt; the bottom of the bearing plate is fixedly provided with an auxiliary wheel for supporting the tower crane type mechanical arm, the side wall of the bearing plate is provided with an arc-shaped guide rail matched with the rotation track of the telescopic rod, and one side of the supporting tower crane type mechanical arm is provided with a limiting plate matched with the arc-shaped guide rail and used for limiting the rotation angle of the displacement part; and a short plate used for filling a gap on one side of the transverse tube of the two telescopic bridge mechanisms is detachably arranged on the transverse tube.

The motion mechanism comprises a front wheel, a rear wheel, a wheel frame and springs, wherein the front wheel and the rear wheel are fixedly connected to the bottom of the bearing plate through the springs, the front wheel is an electric self-driven wheel, and the rear wheel is a universal wheel; and the bearing plate is rotatably provided with a control rod for controlling the front wheel and the rear wheel.

The beneficial effects of the utility model are as follows:

(1) the telescopic bridge frame mechanism paved on the threshold is utilized by the device, and under the condition that an operator is not required to carry goods or lift the device, the device can automatically cross the threshold, so that time and labor are saved, and the safety of the operator and the goods can be ensured.

(2) Compared with other electric cargo transportation devices on the market, the device has the advantages that the electric structure is simple, the threshold crossing effect is ensured, and meanwhile, the manufacturing and maintenance cost of equipment is reduced.

(3) When the utility model is used, the complex operation of unloading and loading the goods is avoided when the goods are transported from one place to another place, the working process of carrying the goods is simplified, and the labor is further saved.

Drawings

FIG. 1 is a front view of the present utility model;

FIG. 2 is a side view of the present utility model;

FIG. 3 is a side view of the telescoping bridge structure of the present utility model;

FIG. 4 is a top view of the telescoping bridge structure of the present utility model;

FIG. 5 is a schematic view of a bent column structure according to the present utility model;

FIG. 6 is a front view of embodiment 1 of the present utility model;

FIG. 7 is a side view of the mechanical arm of embodiment 1 in a folded state;

FIG. 8 is a diagram showing the process of driving an on-board truck according to embodiment 1 of the present utility model;

FIG. 9 is a diagram of a second process of driving an on-board truck according to embodiment 1 of the present utility model;

FIG. 10 is a third diagram of the truck on road according to example 1 of the present utility model;

FIG. 11 is a diagram showing a process of driving an on-board truck according to embodiment 1 of the present utility model;

FIG. 12 is a side view of embodiment 2 of the present utility model;

FIG. 13 is a diagram of a threshold crossing process according to the present utility model;

FIG. 14 is a second threshold crossing process diagram according to the present utility model;

FIG. 15 is a third threshold crossing process diagram according to the present utility model;

FIG. 16 is a diagram of a threshold crossing process according to the present utility model;

FIG. 17 is a diagram of a threshold crossing process according to the present utility model;

fig. 18 is a diagram of a threshold crossing process according to the present utility model.

In the figure, 1, a bearing plate; 2. a storage cavity; 3. a telescopic bridge mechanism; 4. a bridge plate; 5. a support frame; 6. a telescopic connecting pipe; 7. a transverse tube; 8. a column; 9. a connection end; 10. a dispersion end; 11. an inner telescopic tube; 12. an outer shrinkage tube; 13. a sloping plate; 14. a hinge door; 15. jacking pipes; 16. a top plate; 17. a ground sucking structure; 18. a wheel; 19. wheel frame; 20. a lifter; 21. a first motor; 22. an infrared sensing device; 23. a laser positioning device; 24. a telescopic rod; 25. swing arms; 26. a longitudinal screw rod; 27. a gear plate; 28. a transverse guide rail; 29. a screw rod sleeve; 30. a gripping part; 31. a short plate; 32. a connecting plate; 33. a carrying plate; 34. a high strength bolt; 35. an auxiliary wheel; 36. an arc-shaped guide rail; 37. a limiting plate; 38. a front wheel; 39. a rear wheel; 40. a spring; 41. a joystick; 42. driven wheel; 43. an identification device.

Detailed Description

The technical solution of the present utility model will be described in further detail with reference to the accompanying drawings, but the scope of the present utility model is not limited to the following description.

Referring to fig. 1 to 18, an electric cargo transportation device capable of crossing a threshold is provided in an embodiment of the present utility model.

As shown in fig. 1, an electric cargo transportation device capable of crossing a threshold comprises a bearing mechanism, a control mechanism and a movement mechanism; the bearing mechanism comprises a bearing plate 1 for bearing cargoes and a storage cavity 2, and the storage cavity 2 is fixedly arranged at the bottom of the bearing plate 1; the motion mechanism is arranged at the bottom of the bearing plate 1 and can reciprocate along the vertical direction;

as shown in fig. 2, the motion mechanism comprises wheels 18, a wheel frame 19, a lifter 20 and a first motor 21, wherein one end of the lifter 20 is fixedly arranged at the bottom of the bearing plate 1, and the other end of the lifter is connected with the wheels 18 through the wheel frame 19; the lifter 20 is a hydraulic jack, and the lifter 20 is driven by a first motor 21; the wheels 18 are electric self-driven wheels 18 with self-powered devices, and the specific structure and working principle of the electric self-driven wheels are not described herein.

The control mechanism comprises an infrared sensing device 22, a laser positioning device 23 and a controller; the infrared sensing device 22 is arranged on the side wall around the bearing plate 1; the laser positioning device 23 is arranged on the side wall of the side of the bearing plate 1 far away from the hinge door 14; the signal input end of the controller is connected with the infrared sensing device 22 and the laser positioning device 23, and the signal output end of the controller is connected with the first motor 21 and the electric self-driven wheel 18; because the length and the height of the telescopic bridge frame mechanism 3 are preset, when the device is used for crossing a threshold, the telescopic time and the telescopic length of the hydraulic jack in the travelling process of the wheels 18 can be preset in the controller, when the device is used for travelling, the position of the telescopic bridge frame mechanism 3 is only needed to be determined by the laser positioning device 23, other obstacles which obstruct travelling are not present around the device by the infrared sensing device 22, and then the device can ensure that the bearing plate 1 is always in a horizontal state when the device is used for crossing the threshold by the wheels 18 ascending or descending in reasonable time when the device is used for crossing the threshold.

As shown in fig. 3-4, the transporting device further comprises a telescopic bridge mechanism 3 for supporting the device to cross an obstacle, and the telescopic bridge mechanism 3 is detachably arranged in the storage cavity 2; when the telescopic bridge mechanism 3 is not used, the telescopic bridge mechanism 3 which is folded after shrinkage can be placed in the storage cavity 2, and when the device needs to cross a threshold, the telescopic bridge mechanism 3 is taken out from the storage cavity 2 and unfolded and placed on the threshold.

The telescopic bridge mechanism 3 comprises a bridge plate 4, a supporting frame 5 and a telescopic connecting pipe 6; the support frame 5 is of a vertical structure and comprises a transverse pipe 7 and a stand column 8, wherein one end part of the transverse pipe 7 is fixedly connected with one end part of the stand column 8, and the side walls of a connecting end 9 and a diverging end 10 of the support frame 5 are connected with the end parts of the telescopic connecting pipes 6; the telescopic connecting pipe 6 comprises an inner telescopic pipe 11 and an outer telescopic pipe 12, wherein the number of the outer telescopic pipes 12 is two, and the two telescopic pipes are symmetrically and slidably sleeved at two ends of the inner telescopic pipe 11; the bridge plate 4 comprises a sloping plate 13, the side wall of the outer extension 12 at the divergence end 10 and the end part at the divergence end 10 of the upright post 8 are fixedly connected with a top plate 16, and the side wall of the outer extension 12 at the divergence end 10 and the end part at the divergence end 10 of the transverse tube 7 are fixedly connected with the sloping plate 13; the storage cavity 2 is provided with a hinge door 14 for preventing the telescopic bridge mechanism 3 from falling off the storage cavity 2; the structure of the right triangle support frame 5 can ensure that the device provides a firm and stable support slope for the device when the device passes through the telescopic bridge frame mechanism 3 to cross the threshold, and the outer extension pipe 12 which can slide along the inner extension pipe 11 can ensure that the support frame 5 is in a folded state when being stored and can be paved on the threshold when being unfolded; when the telescopic bridge frame mechanism 3 in the folded state is placed in the storage cavity 2, the hinge door 14 can prevent the telescopic bridge frame mechanism 3 from accidentally falling off the storage cavity 2 and falling down on the ground in the driving process of the device, so that the telescopic bridge frame mechanism 3 is damaged.

It should be noted that the width of the expanded telescopic bridge mechanism 3 is consistent with the width of the device, so that when the expanded telescopic bridge mechanism 3 is placed on the threshold, the wheels 18 of the device always run at the middle position of the bridge plate, and the device can smoothly pass through the bridge plate 4.

The number of the supporting frames 5 is two, and the supporting frames are symmetrically arranged at two ends of the outer extension 12; as shown in fig. 5, the upright 8 near one side of the inner telescopic tube 11 is a bent upright 8, and the bent upright 8 is fixedly connected with the inclined plate 13 through a top pipe 15 bypassing the outer telescopic tube 12.

The number of the telescopic bridge frame mechanisms 3 is two; the bridge plate 4 further comprises a top plate 16 for connecting the two telescopic bridge mechanisms 3, and the top plate 16 is integrally connected with the inclined plate 13; the top plate is fixedly connected with the side wall of the outer extension of the side, close to the upright post, of the divergent end and the end part of the divergent end of the upright post; the bridge plate 4 structure with the top plate 16 and the inclined plate 13 connected integrally can ensure that the weight of the device and the loaded goods is born by the telescopic bridge frame mechanism 3 in the process of crossing the threshold, and the threshold is not subjected to excessive pressure load, so that the threshold is prevented from being damaged.

The bottom of the transverse pipe 7 is provided with a ground sucking structure 17 for enhancing the ground adsorption force, and the ground sucking structure 17 is a sucker made of damping materials and having stronger adsorption force; the ground sucking structure 17 not only increases the ground sucking capacity, and enables the telescopic bridge frame mechanism 3 to be more stably fixed on the ground, so that the impact on the side surface of the threshold in the moving process of the device is reduced, and the damage to the threshold is further reduced, but also can reduce the adverse effect of unavoidable vibration on the telescopic bridge frame mechanism 3 when the device climbs over the threshold because the telescopic bridge frame mechanism 3 is a hollow bracket structure, thereby further protecting the telescopic bridge frame mechanism 3 and prolonging the service life of the telescopic bridge frame mechanism 3.

The utility model is further explained below in connection with different usage scenarios:

example 1

As shown in fig. 6, in this embodiment, a tower crane type mechanical arm for loading and unloading cargoes is disposed on a side wall of one side of the bearing plate 1, and the tower crane type mechanical arm includes a gripping portion 30, a displacement portion and a fixing portion, and the displacement portion is rotatably mounted on the fixing portion; the displacement part comprises a telescopic rod 24, a swing arm 25 and a longitudinal screw rod 26, one end of the telescopic rod 24 is fixedly arranged on the fixed part, the other end of the telescopic rod is rotationally connected with the swing arm 25, and a gear disc 27 for the swing arm 25 to rotate is arranged at the joint of the telescopic rod 24 and the swing arm 25; the swing arm 25 is provided with a transverse guide rail 28, the longitudinal screw rod 26 is provided with a screw rod sleeve 29 for the longitudinal screw rod 26 to move along the vertical direction, and the screw rod sleeve 29 is in sliding connection with the swing arm 25 through the transverse guide rail 28; the grabbing part 30 is detachably arranged at one end part of the longitudinal screw rod 26 far away from the swing arm 25; the fixing part comprises a connecting plate 32 and a bearing plate 33, the telescopic rod 24 is fixedly connected to the connecting plate 32, one end of the connecting plate 32 is hinged with the bearing plate 33, and the other end of the connecting plate is detachably connected with the bearing plate 33 through a high-strength bolt 34;

as shown in fig. 7, an auxiliary wheel 35 for supporting a tower crane type mechanical arm is fixedly mounted at the bottom of the bearing plate 33, an arc-shaped guide rail 36 matched with the rotation track of the telescopic rod 24 is arranged on the side wall of the bearing plate 1, and a limit plate 37 matched with the arc-shaped guide rail 36 and used for limiting the rotation angle of the displacement part is arranged on one side of the supporting tower crane type mechanical arm.

The gripping part 30 can be provided with gripping parts such as gripping hooks, clamps and the like in different modes and sizes according to the type, shape and the like of the goods; the movement of the telescopic rod 24, the gear disc 27, the screw rod sleeve 29 along the transverse guide rail 28, the movement of the longitudinal screw rod 26 along the screw rod sleeve 29 and the movement of the limiting plate 37 along the arc guide rail 36 on the mechanical arm are driven by corresponding independent motors; two motors which are connected with the limiting plate 37 are respectively arranged at the two ends of the arc-shaped guide rail 36 and used for driving the limiting plate 37 to move along the arc-shaped guide rail 36 when the connecting plate 32 rotates along the hinge joint; under the situation that goods need to be loaded and unloaded, a tower crane type mechanical arm is added on one side of the bearing plate 1 to replace manpower to independently complete the loading and unloading work of the goods, so that the working intensity of workers is reduced, and the working efficiency is improved; meanwhile, the recognition device 43 for recognizing the goods or the obstacles is further arranged on the screw rod sleeve, the goods to be grasped or the obstacles to be avoided can be accurately distinguished, and the controller can grasp the goods or move away from the mechanical arm to avoid the obstacles according to information fed back by the recognition device 43.

Meanwhile, as shown in fig. 8 to 11, a short plate 31 for filling a gap on one side of the transverse tube 7 of the two telescopic bridge mechanisms 3 is detachably mounted on the transverse tube 7; if the device needs to be moved onto a truck, the telescopic bridge mechanism 3 can be turned over to serve as a ramp for the device to be moved onto the truck, gaps between the transverse pipes 7 are filled by the short plates 31 to form a ramp for the device to move, then the grabbing parts 30 on the mechanical arms are replaced by the driven wheels 42, and the mechanical arms are adjusted to a proper angle, so that the device is ensured not to tip backwards and pass smoothly when the device is driven onto the truck through the ramp formed by the telescopic bridge mechanism 3.

Example 2

As shown in fig. 12, in this embodiment, the movement mechanism includes a front wheel 38, a rear wheel 39, a wheel frame 19 and springs 40, wherein the front wheel 38 and the rear wheel 39 are fixedly connected to the bottom of the carrier plate 33 through the springs 40, the front wheel 38 is an electric self-driven wheel 18, and the rear wheel 39 is a universal wheel; the bearing plate 1 is rotatably provided with a control lever 41 for controlling the forward, backward, stop and left and right turning of the front wheels 38 and the rear wheels 39.

In the embodiment, the four-wheel drive electric wheel 18 of the device is replaced by a mode of driving the front wheel 38 and adjusting the direction of the rear wheel 39, meanwhile, as the infrared sensing device 22 and the laser positioning device 23 are canceled in the embodiment, a user can not see the front obstacle in the forward movement of the device, so that the device is easier to be impacted due to the blocking of the obstacle, the damage to the device caused by the impact is reduced by utilizing the spring 40, and the movement and the steering of the device are controlled by matching with the manual control lever 41; through such structural change, the electric component structure of the device is simplified, and the manufacturing and using costs of the device are further reduced on the aspect of ensuring that the device has the function of crossing the threshold, so that the device can be suitable for different use requirements and application scenes.

The working principle of the utility model is as follows: under the condition of not working, the outer extension pipe 12 is pushed to the inner extension pipe 11 to enable the extension connecting pipe 6 to be in a folded state, the bridge is driven by the extension connecting pipe 6 to be in a folded state with small volume, and the bridge is placed in the storage cavity 2 of the device.

As shown in fig. 13, before the device passes over the threshold, firstly, the telescopic bridge frame mechanism 3 is taken out from the storage cavity 2, the outer telescopic pipe 12 is pulled away from the inner telescopic pipe 11, the telescopic connecting pipe 6 is in a unfolding state, the bridge frame is driven by the telescopic connecting pipe 6 to be in the unfolding state, and then the telescopic bridge frame mechanism 3 in the unfolding state is paved on the threshold;

when the device detects that the telescopic bridge frame mechanism 3 is paved on the threshold and people all reach a safety area, the device autonomously controls the wheels and the lifter to climb over the threshold, firstly, the controller controls the hydraulic jacks of the front wheel and the rear wheel to rise, the bearing plate 1 is driven to rise to a certain height, and the device is ready to start to climb over the threshold.

As shown in fig. 14, when the front wheel 18 moves toward the top plate 16 on the sloping plate 13 of the bridge plate 4, the controller controls the hydraulic jacks corresponding to the front wheel 18 to gradually shrink, the degree of expansion of the hydraulic jacks corresponding to the rear wheel 18 is unchanged, and simultaneously, the four wheels 18 continue to move forward, so that the bearing plate 1 is always in a horizontal state when the front wheel 1 moves toward the top plate 16 on the sloping plate 13;

while the front wheels 18 travel on the roof panel 16, the degree of expansion and contraction of the hydraulic jacks corresponding to the four wheels 18 is kept unchanged, and the four wheels 18 continue to move forward.

As shown in fig. 15, after the front wheel 18 moves across the roof panel 16, the controller controls the hydraulic jack corresponding to the front wheel 18 to gradually rise until the hydraulic jack corresponding to the front wheel 18 does not expand and contract any more when the front wheel 18 moves onto the ground as shown in fig. 16;

as shown in fig. 17, when the rear wheel 18 moves on the bridge plate 4, the process of the rear wheel 18 crossing the bridge plate 4 is completed with reference to the same contracted-flattened-lifted state of the corresponding hydraulic jack when the front wheel 18 moves on the bridge plate 4, and the degree of expansion and contraction of the hydraulic jack corresponding to the front wheel 18 is unchanged in the process of the rear wheel 18 crossing the bridge plate 4.

As shown in fig. 18, after the wheels 18 behind the device pass over the bridge plate 4, the operator pushes the outer extension pipe 12 to the inner extension pipe 11 to enable the extension connecting pipe 6 to be in a folded state, and the bridge is driven by the extension connecting pipe 6 to be in a folded state with small size, so that the bridge is placed in the storage cavity 2 of the device again.

The foregoing is merely a preferred embodiment of the utility model, and it is to be understood that the utility model is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either as taught or as a matter of routine skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the utility model are intended to be within the scope of the appended claims.

Claims

1. An electric cargo transportation device capable of crossing a threshold, which is characterized in that: the cargo transportation device comprises a bearing mechanism, a control mechanism and a movement mechanism; the bearing mechanism comprises a bearing plate for bearing goods and a storage cavity, and the storage cavity is fixedly arranged at the bottom of the bearing plate; the motion mechanism is arranged at the bottom of the bearing plate and can reciprocate along the vertical direction;

2. The threshold-surmountable electric cargo transportation device of claim 1, wherein: the telescopic bridge mechanism comprises a bridge plate, a supporting frame and a telescopic connecting pipe; the support frame is of a vertical structure and comprises a transverse pipe and an upright post, one end part of the transverse pipe is fixedly connected with one end part of the upright post, and the connecting end of the support frame and the side wall of the dispersing end are connected with the end parts of the telescopic connecting pipes; the telescopic connecting pipe comprises an inner telescopic pipe and outer telescopic pipes, wherein the number of the outer telescopic pipes is two, and the two outer telescopic pipes are symmetrically and slidably sleeved at two ends of the inner telescopic pipe; the bridge plate comprises an inclined plate, and the side wall of the outer extension at the divergence end and the end part at the upright post divergence end are fixedly connected with the inclined plate; the storage cavity is provided with a hinge door for preventing the telescopic bridge mechanism from falling off the storage cavity.

3. The threshold-surmountable electric cargo transportation device of claim 2, wherein: the number of the supporting frames is two, and the supporting frames are symmetrically arranged at two ends of the outer extension; the stand column close to one side of the inner telescopic pipe is a bending stand column, and the bending stand column is fixedly connected with the inclined plate through a jacking pipe which bypasses the outer telescopic pipe.

4. The threshold-surmountable electric cargo transportation device of claim 2, wherein: the number of the telescopic bridge frame mechanisms is two; the bridge plate further comprises a top plate used for connecting the two telescopic bridge mechanisms, and the top plate is integrally connected with the inclined plate; the top plate is fixedly connected with the side wall of the outer extension of the side, close to the upright post, of the divergent end and the end part of the divergent end of the upright post.

5. The threshold-surmountable electric cargo transportation device of claim 2, wherein: the bottom of the transverse tube is provided with a ground sucking structure for enhancing the ground adsorption force, and the ground sucking structure is a sucker.

6. The threshold-surmountable electric cargo transportation device of claim 2, wherein: the motion mechanism comprises wheels, a wheel frame, a lifter and a first motor, wherein one end of the lifter is fixedly arranged at the bottom of the bearing plate, and the other end of the lifter is connected with the wheels through the wheel frame; the lifter is a hydraulic jack and is driven by a first motor; the wheels are electric self-driven wheels.

7. The threshold-surmountable electric cargo transportation device of claim 6, wherein: the control mechanism comprises an infrared sensing device, a laser positioning device and a controller; the infrared sensing device is arranged on the side wall around the bearing plate; the laser positioning device is arranged on the side wall of one side of the bearing plate far away from the hinge door; the signal input end of the controller is connected with the infrared sensing device and the laser positioning device, and the signal output end of the controller is connected with the first motor and the electric self-driven wheel.

8. The threshold-surmountable electric cargo transportation device of claim 4, wherein: the side wall of one side of the bearing plate is provided with a tower crane type mechanical arm for loading and unloading cargoes, the tower crane type mechanical arm comprises a grabbing part, a displacement part and a fixing part, and the displacement part is rotatably arranged on the fixing part; the displacement part comprises a telescopic rod, a swing arm and a longitudinal screw rod, one end of the telescopic rod is fixedly arranged on the fixed part, the other end of the telescopic rod is rotationally connected with the swing arm, and a gear disc for the swing arm to rotate is arranged at the joint of the telescopic rod and the swing arm; the swing arm is provided with a transverse guide rail, the longitudinal screw rod is provided with a screw rod sleeve for the longitudinal screw rod to move along the vertical direction, and the screw rod sleeve is in sliding connection with the swing arm through the transverse guide rail; the grabbing part is detachably arranged at one end part of the longitudinal screw rod far away from the swing arm; the fixing part comprises a connecting plate and a bearing plate, the telescopic rod is fixedly connected to the connecting plate, one end of the connecting plate is hinged with the bearing plate, and the other end of the connecting plate is detachably connected with the bearing plate through a high-strength bolt; the bottom of the bearing plate is fixedly provided with an auxiliary wheel for supporting the tower crane type mechanical arm, the side wall of the bearing plate is provided with an arc-shaped guide rail matched with the rotation track of the telescopic rod, and one side of the supporting tower crane type mechanical arm is provided with a limiting plate matched with the arc-shaped guide rail and used for limiting the rotation angle of the displacement part; and a short plate used for filling a gap on one side of the transverse tube of the two telescopic bridge mechanisms is detachably arranged on the transverse tube.

9. The threshold-surmountable electric cargo transportation device of claim 1, wherein: the motion mechanism comprises a front wheel, a rear wheel, a wheel frame and springs, wherein the front wheel and the rear wheel are fixedly connected to the bottom of the bearing plate through the springs, the front wheel is an electric self-driven wheel, and the rear wheel is a universal wheel; and the bearing plate is rotatably provided with a control rod for controlling the front wheel and the rear wheel.