Lifting device and lifting method for loading and unloading a vehicle

Abstract

This application relates to a lifting device and method for loading and unloading trucks, including a connecting mechanism, a truck bed connecting plate, a buffer platform, a platform connecting plate, and a lifting mechanism. The truck bed connecting plate is used to load and unload trucks. The buffer platform is rotatably connected to the truck bed connecting plate via the connecting mechanism. The platform connecting plate is used to load and unload the platform. The lifting mechanism supports the buffer platform below and adjusts the height of the buffer platform according to the relative angle between the truck bed connecting plate and the buffer platform. This achieves automatic height adjustment based on the truck height, solving the height adjustment problem caused by changes in cargo weight during truck loading and unloading, and greatly improving the efficiency of loading and unloading trucks. Therefore, it is suitable for automated loading and unloading, solving the problem that traditional loading ramps cannot adapt to forklift-type AGV loading and unloading, and solving the problem of loading and unloading truck beds from the platform during automated loading and unloading of forklift-type AGVs, which is conducive to realizing unmanned operation of the entire warehousing and logistics process.

Description

Technical Field

[0001] This application relates to the field of lifting devices, and in particular to lifting devices and methods for loading and unloading trucks. Background Technology

[0002] The use of Automated Guided Vehicles (AGVs) for automated loading and unloading is a trend in the logistics industry. However, there is a lack of specialized equipment for adjusting the height of AGVs when loading and unloading goods. Traditional automated loading and unloading technologies directly use loading ramps designed for manual forklifts to enable AGVs to load and unload goods.

[0003] For example, Chinese patent CN214191777U discloses a height-adjustable platform for unloading, including an overlap plate, a transition plate, a support frame, and a lifting drive mechanism for driving the overlap plate to rise or fall. The transition plate has a groove, and a screw passes through the groove to connect with a sliding block. The sliding block is rotatably connected to the overlap plate. The overlap plate is equipped with a rotation drive mechanism for driving the transition plate to rotate. The overlap plate is rotatably connected to the support frame. One end of the lifting drive mechanism is rotatably connected to the support frame, and the other end of the lifting drive mechanism is rotatably connected to the overlap plate. The rotation drive mechanism includes a movable support leg and a rotation drive cylinder. One end of the rotation drive cylinder is rotatably connected to the overlap plate, and the other end of the rotation drive cylinder is rotatably connected to the movable support leg. The movable support leg is sleeved on a rotating shaft, and the rotating shaft passes through the sliding block and the overlap plate to make the sliding block rotatably connected to the overlap plate.

[0004] However, this patent document describes a ramp-type loading ramp, which connects directly to the truck via an inclined plane and uses hydraulic cylinders for vertical movement. The loading ramp is fixedly installed on the platform, connecting the truck bed to the platform to allow forklifts to load and unload the truck bed. This method of using an inclined loading ramp presents two problems:

[0005] First, the inclined plane is used to directly connect with the truck. Since the height of the cargo pallet cannot be too high, otherwise it may tip over. The forklift AGV's forks extend along the inclined plane and cannot reach the bottom of the cargo closest to the rear of the truck, making it difficult to unload the cargo at the rear.

[0006] Second, the inclined loading ramp does not have an automatic lifting and adjustment system, but only a lifting system with a fixed stroke. It cannot adjust the lifting height in real time, so it cannot solve the problem of changes in the height of the truck bed caused by changes in the weight of the cargo during loading and unloading, thus failing to guarantee the stability of loading.

[0007] To overcome the above two problems, traditional technology offers an alternative solution: a planar lifting loading ramp. This ramp connects to the platform and the wagon car, allowing for the unloading of cargo from the wagon car. The workflow is as follows: first, the planar loading ramp is adjusted to the same height as the platform; then, the AGV is driven onto the ramp; next, the ramp is raised to the height of the wagon car; finally, the AGV enters the wagon car to load and unload cargo.

[0008] This method of using a planar lifting loading ramp has two problems:

[0009] First, the work efficiency is very low. Each time the AGV boards the vehicle, it must wait for the loading bridge to be raised and lowered into place before it can load and unload goods, which greatly increases the overall operation time.

[0010] Second, it lacks an automatic lifting and adjustment system, possessing only a lifting system with a fixed stroke, which cannot adjust the lifting height in real time. Therefore, it cannot solve the problem of changes in the height of the truck bed caused by changes in the weight of the cargo during loading and unloading. Summary of the Invention

[0011] Therefore, it is necessary to provide a lifting device and lifting method for loading and unloading trucks.

[0012] In one embodiment, a lifting device for loading and unloading trucks includes:

[0013] Connection mechanism;

[0014] Carriage connecting plate, used to connect freight cars;

[0015] The buffer platform is rotatably connected to the carriage connecting plate via the connecting mechanism.

[0016] The platform connecting plate is rotatably connected to the buffer platform and is used to connect the platform;

[0017] A lifting mechanism supports the buffer platform below it and is used to adjust the height of the buffer platform according to the relative angle between the carriage connecting plate and the buffer platform.

[0018] The aforementioned lifting device for loading and unloading trucks uses angle sensing to automatically adjust the height according to the truck's height. This solves the problem of height adjustment caused by changes in cargo weight during loading and unloading, and greatly improves the efficiency of loading and unloading trucks. Therefore, it is suitable for automated loading and unloading, especially for forklift AGVs. It solves the problem that traditional loading ramps cannot adapt to forklift AGV loading and unloading, and also solves the problem of loading and unloading trucks from the platform during automated loading and unloading of forklift AGVs, which is conducive to realizing unmanned operation of the entire warehousing and logistics process.

[0019] In one embodiment, the lifting device for loading and unloading trucks further includes a rotating bridge and a follower rotating mechanism;

[0020] The rotating bridge plate is disposed between the buffer platform and the platform connecting plate, and the rotating bridge plate is rotatably connected to the buffer platform and the platform connecting plate respectively, so that the platform connecting plate is rotatably connected to the buffer platform through the rotating bridge plate;

[0021] A follower rotation mechanism is disposed below the rotating bridge plate and at one end of the rotating bridge plate adjacent to the platform connecting plate. It is used to cooperate with the lifting mechanism to adjust the height of the buffer platform so as to support the rotating bridge plate in the rotating state.

[0022] In one embodiment, the follower rotation mechanism includes a support frame, a driven wheel track, a driven wheel, a driven wheel seat, and a wheel track bracket;

[0023] The support frame is disposed adjacent to the platform connecting plate;

[0024] The wheel track bracket is fixed to the support frame;

[0025] The driven wheel track is fixed on the wheel track bracket;

[0026] The movable wheel seat is located below the rotating bridge plate and is fixed to one end of the rotating bridge plate adjacent to the platform connecting plate;

[0027] The driven wheel is mounted on the driven wheel seat, slides on the driven wheel track, and is confined within the wheel track support.

[0028] Furthermore, in one embodiment, the overall height of the support frame and the wheel track bracket is set according to the height of the platform, so that the angle between the rotating bridge plate and the platform connecting plate is within a preset angle range, so as to prevent the slope between the rotating bridge plate and the platform connecting plate from being too large.

[0029] Furthermore, in one embodiment, the height of the support frame is set or adjusted according to the height of the platform.

[0030] In one embodiment, the lifting mechanism is used to adjust the height of the buffer platform so that the relative angle is within a preset range, or to bring the lifting mechanism to an extreme position, the extreme position including the highest adjustment position and the lowest adjustment position.

[0031] In one embodiment, the lifting mechanism includes a scissor lift assembly and a drive assembly;

[0032] The scissor lift assembly is located below the buffer platform and supports the buffer platform.

[0033] The drive assembly is connected to the scissor lift assembly and is used to adjust the height of the scissor lift assembly according to the relative angle between the carriage connecting plate and the buffer platform, thereby adjusting the height of the buffer platform.

[0034] In one embodiment, the drive assembly includes a servo motor, a coupling, a forward and reverse lead screw, a left-hand lead screw nut seat, and a right-hand lead screw nut seat;

[0035] The left-hand threaded portion of the positive and negative lead screw is screwed to the left-hand lead screw nut seat, and the right-hand threaded portion of the positive and negative lead screw is screwed to the right-hand lead screw nut seat;

[0036] The left-hand lead screw nut seat and the right-hand lead screw nut seat are respectively fixedly connected to the scissor-type support rod of the scissor lift assembly to adjust the scissor shape of the scissor-type support rod;

[0037] The servo motor is connected to the positive and negative lead screws via the coupling. By driving the positive and negative lead screws to rotate, the left-hand lead screw nut seat and the right-hand lead screw nut seat move closer or further apart, thereby increasing or decreasing the height of the scissor lift assembly.

[0038] In one embodiment, the scissor lift assembly further includes a sliding hinge, a support frame, a bearing support, a hinge connecting plate, a slide rail, and a slider.

[0039] The positive and negative lead screws are screwed to the two bearing supports and are limited to the support structure frame by the two bearing supports;

[0040] At least two slide rails are provided under the buffer platform and on the support structure frame, and each end of the scissor support rod is connected to a slider through a sliding hinge. Each slider is slidably mounted on at least one slide rail.

[0041] The left-hand lead screw nut seat and the right-hand lead screw nut seat are respectively fixedly connected to two hinge connecting plates. Each hinge connecting plate is connected to two opposite sliding hinges. The servo motor drives the left-hand lead screw nut seat and the right-hand lead screw nut seat to move closer or farther away from each other, so as to drive the two hinge connecting plates to move closer or farther away from each other, thereby driving the height of the scissor-type support rod to increase or decrease.

[0042] In one embodiment, the connecting mechanism includes a torsion spring, a rotating shaft, and a mounting base;

[0043] The mounting base is fixed to the buffer platform;

[0044] The rotating shaft is fixed to the mounting base, and the carriage connecting plate is rotatably mounted on the rotating shaft;

[0045] The torsion spring is mounted on the rotating shaft, and the torsion arm of the torsion spring abuts against the underside of the cargo box connecting plate. The torsion spring is used to support the cargo box connecting plate when it is not connected to the truck.

[0046] In one embodiment, the connecting mechanism includes an angle sensor that is signal-connected to the lifting mechanism. The angle sensor is used to sense the relative angle between the carriage connecting plate and the buffer platform and outputs a signal to the lifting mechanism.

[0047] In one embodiment, a method for lifting and lowering a loading / unloading truck is implemented using the loading / unloading truck lifting device described in any embodiment, and the method includes the following steps:

[0048] The platform connecting plate is attached to the platform;

[0049] The connecting plate of the carriage is attached to the truck;

[0050] Obtain the relative angle between the carriage connecting plate and the buffer platform;

[0051] The height of the buffer platform is adjusted by the lifting mechanism according to the relative angle to accommodate the height of the truck. Attached Figure Description

[0052] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0053] Figure 1 This is a schematic diagram of an embodiment of the lifting device for loading and unloading trucks described in this application.

[0054] Figure 2 for Figure 1 The illustrated embodiment is a schematic diagram applied to a platform.

[0055] Figure 3 for Figure 1 The illustrated embodiment is a schematic diagram applied to a freight car and a platform.

[0056] Figure 4 for Figure 1 The illustrated embodiment is a schematic diagram applied to a freight car and another platform.

[0057] Figure 5 for Figure 1 The illustrated embodiment is a schematic diagram applied to another freight car and another platform.

[0058] Figure 6 for Figure 5 The illustrated embodiment is a schematic diagram after the truck has been removed.

[0059] Figure 7 for Figure 6 The illustrated embodiment is a schematic diagram after the platform has been removed.

[0060] Figure 8 for Figure 7 Another schematic diagram of the embodiment shown.

[0061] Figure 9 for Figure 8 An enlarged schematic diagram of point A in the illustrated embodiment.

[0062] Figure 10 for Figure 8 An enlarged schematic diagram of section B in the illustrated embodiment.

[0063] Figure 11 This is a partial structural schematic diagram of another embodiment of the lifting device for loading and unloading trucks described in this application.

[0064] Figure 12 This is a partial structural schematic diagram of another embodiment of the lifting device for loading and unloading trucks described in this application.

[0065] Figure 13 for Figure 12 An enlarged schematic diagram of point C in the illustrated embodiment.

[0066] Figure 14 for Figure 12 An enlarged schematic diagram of point D in the illustrated embodiment.

[0067] Figure 15 for Figure 12 A partial enlarged structural diagram of the embodiment shown.

[0068] Figure 16 This is a partial structural schematic diagram of another embodiment of the lifting device for loading and unloading trucks described in this application.

[0069] Figure 17 for Figure 16 An enlarged schematic diagram of point E in the embodiment shown.

[0070] Figure 18 for Figure 16 Another schematic diagram of the embodiment shown.

[0071] Figure 19This is a partial structural schematic diagram of another embodiment of the lifting device for loading and unloading trucks described in this application.

[0072] Figure 20 for Figure 19 An enlarged schematic diagram of point F in the illustrated embodiment.

[0073] Figure label:

[0074] 100 trucks, 200 lifting devices, 300 platforms;

[0075] Carriage bearing surface 110, connecting mechanism 210, carriage connecting plate 220, buffer platform 230, rotating bridge plate 240, platform connecting plate 250, scissor lift assembly 260, follower rotating mechanism 270, lifting mechanism 280, drive assembly 290;

[0076] Torsion spring 211, rotating shaft 212, mounting base 213, angle sensor 214;

[0077] 261. Scissor-type support rod, 262. Sliding hinge, 263. Support structure frame, 264. Bearing support, 265. Hinge connecting plate, 266. Slide rail, 267.

[0078] Support frame 271, driven wheel track 272, driven wheel 273, driven wheel seat 274, wheel track bracket 275;

[0079] First slide rail 281, second slide rail 282, third slide rail 283, first slider 284, second slider 285;

[0080] Servo motor 291, coupling 292, forward and reverse lead screw 293, left-hand lead screw nut seat 294, right-hand lead screw nut seat 295, left-hand threaded part 296, right-hand threaded part 297;

[0081] Relative angle α, included angle β. Detailed Implementation

[0082] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0083] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0084] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0085] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0086] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0087] This application discloses a lifting device and method for loading and unloading freight trucks, which includes some or all of the structures of the following embodiments; that is, the lifting device and method for loading and unloading freight trucks includes some or all of the following technical features. In one embodiment of this application, a lifting device for loading and unloading freight trucks includes a connecting mechanism, a cargo box connecting plate, a buffer platform, a platform connecting plate, and a lifting mechanism; the cargo box connecting plate is used to connect the freight trucks; the buffer platform is rotatably connected to the cargo box connecting plate through the connecting mechanism; the platform connecting plate is rotatably connected to the buffer platform for connecting the platform; the lifting mechanism supports the buffer platform below the buffer platform and is used to adjust the height of the buffer platform according to the relative angle between the cargo box connecting plate and the buffer platform. The aforementioned lifting device for loading and unloading trucks uses angle sensing to automatically adjust the height according to the truck's height. This solves the problem of height adjustment caused by changes in cargo weight during loading and unloading, and greatly improves the efficiency of loading and unloading trucks. Therefore, it is suitable for automated loading and unloading, especially for forklift AGVs. It solves the problem that traditional loading ramps cannot adapt to forklift AGV loading and unloading, and also solves the problem of loading and unloading trucks from the platform during automated loading and unloading of forklift AGVs, which is conducive to realizing unmanned operation of the entire warehousing and logistics process.

[0088] In one embodiment, a lifting device 200 for loading and unloading trucks is as follows: Figure 1 As shown, it includes a connecting mechanism 210, a carriage connecting plate 220, a buffer platform 230, a platform connecting plate 250, and a lifting mechanism 280; the buffer platform 230 is rotatably connected to the carriage connecting plate 220 through the connecting mechanism 210, and the platform connecting plate 250 is rotatably connected to the buffer platform 230; combined with Figure 2 and Figure 3 The cargo box connecting plate 220 is used to connect with the freight car 100, and the platform connecting plate 250 is used to connect with the platform 300, so that goods can be transported from the platform 300 onto the freight car 100, or from the freight car 100 off the platform 300. This structural design facilitates the lifting device 200, i.e., the lifting device 200 for loading and unloading freight cars, to easily and quickly physically connect the freight car 100 and the platform 300. Furthermore, since the horizontal positions of the freight car 100, the lifting device 200, and the platform 300 are stable, the connections between the cargo box connecting plate 220 and the freight car 100, and between the platform connecting plate 250 and the platform 300, are reliable, which helps ensure the reliability of the automatic loading and unloading process.

[0089] In each embodiment, the lifting mechanism 280 supports the buffer platform 230 below it; that is, the lifting mechanism 280 is located below the buffer platform 230 and supports it. The lifting mechanism 280 is also used to automatically adjust the height of the buffer platform 230 to adapt to the height of the truck 100, and to adapt to changes in the height of the truck 100 during loading and unloading of goods. This design facilitates the automatic loading of goods onto the truck or the automatic unloading of goods from the truck, allowing them to enter the warehouse via the platform 300 or be directly distributed.

[0090] In this embodiment, the lifting device 200 for loading and unloading freight cars further includes a rotating bridge plate 240 and a follower rotating mechanism 270. The rotating bridge plate 240 is disposed between the buffer platform 230 and the platform connecting plate 250, and the rotating bridge plate 240 is rotatably connected to both the buffer platform 230 and the platform connecting plate 250, so that the platform connecting plate 250 is rotatably connected to the buffer platform 230 through the rotating bridge plate 240. The follower rotating mechanism 270 is disposed below the rotating bridge plate 240 and located at one end of the rotating bridge plate 240 adjacent to the platform connecting plate 250, and is used to cooperate with the lifting mechanism 280 to adjust the height of the buffer platform 230, so as to support the rotating bridge plate 240 in the rotating state. Further, in one embodiment, the height of the follower rotating mechanism 270 is set or adjusted according to the height of the platform 300 so that the included angle β between the rotating bridge plate 240 and the platform connecting plate 250 is within a preset angle range. This structural design helps ensure a smooth transition from platform 300 to buffer platform 230, thereby ensuring the stability of the channel during the automatic loading and unloading process and facilitating the realization of unmanned operation throughout the entire warehousing and logistics process.

[0091] Furthermore, in one embodiment, the preset included angle range is 0 degrees to 15 degrees, which can also be understood as ±15 degrees, to prevent the slope between the rotating bridge plate 240 and the platform connecting plate 250 from being too large, ensuring the safe transportation of the loading and unloading trucks and their loaded goods. Further, in one embodiment, the preset included angle range is 0 degrees to 10 degrees, i.e., ±10 degrees. It can be understood that when the degree is positive, the upper surface of the buffer platform 230 of the lifting device 200 for loading and unloading trucks is higher than the cargo bed bearing surface 110 of the truck 100. Figure 3 As shown; when the degree is negative, the upper surface of the buffer platform 230 is lower than the carriage bearing surface 110. For AGV applications, to facilitate AGV loading and entry into the carriage, the upper surface of the buffer platform 230 is typically higher than the carriage bearing surface 110. Further, in one embodiment, as... Figure 4As shown, the height of the follower rotating mechanism 270 is the same as the height of the platform 300, that is, the angle between the rotating bridge plate 240 and the platform connecting plate 250 is 0 degrees, meaning that the rotating bridge plate 240 and the platform connecting plate 250 are level. This structural design helps to control the slope between the rotating bridge plate 240 and the platform 300, ensuring the safe transportation of the loading and unloading trucks and their loaded goods.

[0092] For slightly taller trucks, the application of the truck lifting device 200 is as follows: Figure 5 and Figure 6 As shown, the lifting mechanism 280 supports the buffer platform 230 below the buffer platform 230, and is used to adjust the height of the buffer platform 230 according to the relative angle α between the carriage connecting plate 220 and the buffer platform 230; that is, the lifting mechanism 280 automatically adjusts the height of the buffer platform 230 to adapt to the height of the truck 100. In one embodiment, the lifting mechanism 280 is used to adjust the height of the buffer platform 230 so that the relative angle α is within a preset range, or to make the lifting mechanism 280 at an extreme position, the extreme position including the highest adjustment position and the lowest adjustment position. Further, in one embodiment, the preset range is 0 degrees to 15 degrees, which can also be understood as ±15 degrees, to prevent the slope between the buffer platform 230 and the carriage bearing surface 110 of the truck 100 from being too large, and to ensure the safe transportation of the loading and unloading transportation device and the goods loaded on it. Further, in one embodiment, the preset range is 0 degrees to 10 degrees, that is, ±10 degrees. It is understandable that, since the lifting device 200 for loading and unloading trucks is a fixed product after production, when the load-bearing surface 110 of the truck bed 100 is too high or too low, it may not be possible to guarantee that the relative angle α is within the preset range. In this case, the lifting mechanism 280 is used to adjust the height of the buffer platform 230 so that the lifting mechanism 280 is in its extreme position, i.e., at the highest or lowest adjustment position, to facilitate loading and unloading of the forklift AGV. Figures 1 to 4 In the illustrated embodiment, the lifting mechanism 280 is in its lowest adjusted position, such as... Figure 5 and Figure 6 In the embodiment shown, the lifting mechanism 280 is in the intermediate adjustment position. In this state, the height of the buffer platform 230 can be further adjusted to raise or lower it.

[0093] Furthermore, in other embodiments, the lifting mechanism 280 is used to adjust the height of the buffer platform 230 so that the relative angle α is within the preset range. When the relative angle α remains outside the preset range, that is, no matter how it is adjusted, the relative angle α cannot be brought within the preset range, the lifting mechanism 280 issues a stop signal to prevent the loading and unloading of the truck, that is, to prevent the trolley, especially the AGV, from loading and unloading the truck; or, the lifting mechanism 280 issues a replacement signal to request the replacement of the trolley with a larger wheel diameter to meet the increased transportation requirements caused by the relative angle α exceeding the preset range. Furthermore, in various embodiments, the lifting mechanism 280 or the lifting device 200 is equipped with a controller. The controller is connected to the connecting mechanism 210 or the angle sensor 214 of the connecting mechanism 210. The controller is also connected to the drive assembly 290 of the lifting mechanism 280 or the servo motor 291 of the drive assembly 290. The controller is used to receive the signal from the angle sensor 214, i.e., the sensing signal, and determine the relative angle between the truck bed connecting plate 220 and the buffer platform 230 based on the signal. It also automatically controls the servo motor 291 to adjust the height of the buffer platform 230 based on the relative angle. This design allows the lifting device 200 for loading and unloading trucks to safely and orderly meet the demands of the transportation environment for transport vehicles, such as forklift AGVs, ensuring the safety, unmanned operation, and intelligence of the automatic loading and unloading process of the forklift AGV.

[0094] In this embodiment, as Figure 5 and Figure 6 As shown, the lifting mechanism 280 includes a scissor lift assembly 260 and a drive assembly 290; the scissor lift assembly 260 is located below the buffer platform 230 and supports the buffer platform 230; the drive assembly 290 drives and connects to the scissor lift assembly 260, and is used to adjust the height of the scissor lift assembly 260 according to the relative angle α between the carriage connecting plate 220 and the buffer platform 230, so as to adjust the height of the buffer platform 230.

[0095] In one embodiment, such as Figure 7 and Figure 8 As shown, the drive assembly 290 includes a servo motor 291, a coupling 292, and a positive and negative lead screw 293. The servo motor 291 is connected to the positive and negative lead screw 293 via the coupling 292, and is used to drive the positive and negative lead screw 293 to rotate. Figure 1The forward and reverse lead screw 293 adjusts the scissor shape of the scissor support rod 261 of the scissor lift assembly 260, thereby adjusting the height of the scissor support rod 261, and consequently the height of the scissor lift assembly 260, ultimately adjusting the height of the buffer platform 230. This structural design, through angle sensing, achieves automatic height adjustment based on the truck's height, solving the height adjustment problem caused by changes in cargo weight during loading and unloading. Furthermore, because it is automatic, it greatly improves the efficiency of loading and unloading trucks.

[0096] The positive and negative lead screw 293 has two reverse threads, combined with Figure 9 and Figure 10 The forward and reverse lead screw 293 is screwed to two bearing supports 264. Specifically, the forward and reverse lead screw 293 has a left-hand threaded portion 296 and a right-hand threaded portion 297. The forward and reverse lead screw 293 is screwed to one bearing support 264 through the left-hand threaded portion 296, and the forward and reverse lead screw 293 is screwed to the other bearing support 264 through the right-hand threaded portion 297. The two bearing supports 264 serve to support the forward and reverse lead screw 293. With this structural design, by controlling the output of the servo motor 291, including the rotation direction and number of rotations of the output shaft, the relative position of the two bearing supports 264 can be adjusted, thereby controlling the scissor-type support rod 261 to drive the buffer platform 230 to rise and fall. This design has the advantages of simple control and accurate lifting height.

[0097] Combination Figure 11 and Figure 12 The positive and negative lead screws 293 are screwed to the two bearing supports 264 and are constrained on the support structure frame 263 by the two bearing supports 264; one end of the positive and negative lead screws 293 is also connected to the coupling 292. In this embodiment, the drive assembly 290 also includes a left-hand lead screw nut seat 294 and a right-hand lead screw nut seat 295. The left-hand threaded portion 296 of the positive and negative lead screws 293 is screwed to the left-hand lead screw nut seat 294, and the right-hand threaded portion 297 of the positive and negative lead screws 293 is screwed to the right-hand lead screw nut seat 295; the left-hand lead screw nut seat 294 and the right-hand lead screw nut seat 295 are not installed on the support structure frame 263, but are respectively fixedly connected to the two hinge connecting plates 265, combined with Figure 13 and Figure 14That is, one of the hinge connecting plates 265 is fixedly connected to the left-hand lead screw nut seat 294, and the other hinge connecting plate 265 is fixedly connected to the right-hand lead screw nut seat 295. When the servo motor 291 drives the lead screw 293 to rotate in one direction, for example clockwise, through the coupling 292, the lead screw 293 causes the left-hand lead screw nut seat 294 and the right-hand lead screw nut seat 295 to move closer together, thereby increasing the height of the scissor-type support rod 261 of the scissor lift assembly 260, i.e., raising the upper surface of the buffer platform 230. When the servo motor 291 drives the lead screw 293 to rotate in another direction, for example counterclockwise, through the coupling 292, the lead screw 293 causes the left-hand lead screw nut seat 294 and the right-hand lead screw nut seat 295 to move further apart, thereby decreasing the height of the scissor-type support rod 261 of the scissor lift assembly 260, i.e., lowering the upper surface of the buffer platform 230.

[0098] In one embodiment, such as Figure 11 and Figure 12 As shown, the drive assembly 290 includes a servo motor 291, a coupling 292, a forward and reverse lead screw 293, a left-hand lead screw nut seat 294, and a right-hand lead screw nut seat 295; the left-hand threaded portion 296 of the forward and reverse lead screw 293 is screwed to the left-hand lead screw nut seat 294, and the right-hand threaded portion 297 of the forward and reverse lead screw 293 is screwed to the right-hand lead screw nut seat 295; the left-hand lead screw nut seat 294 and the right-hand lead screw nut seat 295 are respectively fixedly connected. The scissor lift assembly 260 has a scissor-type support rod 261 for adjusting its scissor shape. The servo motor 291 is connected to the positive and negative lead screws 293 via the coupling 292. By driving the positive and negative lead screws 293 to rotate, the left-hand lead screw nut seat 294 and the right-hand lead screw nut seat 295 move closer or further apart, thereby increasing or decreasing the height of the scissor lift assembly 260. In other embodiments, the servo motor 291 and the lead screw transmission mechanism with the positive and negative lead screws 293 can be replaced by other similar transmission mechanisms such as rigid chains or rack and pinion gears.

[0099] In this embodiment, the scissor lift assembly 260 further includes a sliding hinge 262, a support frame 263, bearing supports 264, a hinge connecting plate 265, slide rails 266, and sliders 267; the positive and negative lead screws 293 are screwed to two bearing supports 264 and are limited on the support frame 263 by the two bearing supports 264; at least two slide rails 266 are respectively provided under the buffer platform 230 and on the support frame 263; each end of the scissor support rod 261 is connected to a slider 267 through a sliding hinge 262. The slider 267 is slidably mounted on at least one of the slide rails 266; the left-hand lead screw nut seat 294 and the right-hand lead screw nut seat 295 are respectively fixedly connected to two hinge connecting plates 265, and each hinge connecting plate 265 is respectively connected to two opposite sliding hinges 262. The servo motor 291 drives the left-hand lead screw nut seat 294 and the right-hand lead screw nut seat 295 to move closer or further away from each other, so as to drive the two hinge connecting plates 265 to move closer or further away from each other, thereby driving the height of the scissor-type support rod 261 to increase or decrease. As goods are loaded or unloaded, the height of the truck bed can change by 15 to 30 centimeters or even more. In contrast, the wheel height of an AGV is usually no more than 25 centimeters. Therefore, traditional loading ramps cannot accommodate forklift-type AGVs getting on and off. The structural design of this application realizes the function of automatically raising and lowering the height according to the height change of the truck, which solves the problem of height adjustment caused by changes in the weight of the goods during the loading and unloading of trucks. It also solves the problem of traditional loading ramps being unable to accommodate forklift-type AGVs getting on and off, and solves the problem of forklift-type AGVs getting on and off the truck bed from the platform 300 during automatic loading and unloading. Therefore, it is suitable for automated loading and unloading, especially for forklift-type AGVs, which is conducive to realizing unmanned operation of the entire warehousing and logistics process.

[0100] Furthermore, in one embodiment, the buffer platform 230 is provided with two sets of slide rails 266, and the support structure frame 263 is also provided with two sets of slide rails 266. The four sets of slide rails 266 correspond to the four pairs of ends of the scissor-type support rod 261, with each pair of ends corresponding to one set of slide rails 266. That is, the eight ends of the scissor-type support rod 261 are divided into four pairs, and each pair of ends, i.e., two ends, corresponds to one set of slide rails 266. Figure 15Each set of slide rails 266 includes a first slide rail 281, a second slide rail 282, and a third slide rail 283. In each pair of ends, each end is connected to a slider 267 via a sliding hinge 262. The slider 267 connected to each pair of ends includes a first slider 284 and a second slider 285. The first slider 284 is slidably mounted on the first slide rail 281 and the second slide rail 282, and is confined to the first slide rail 281 and the second slide rail 282, i.e., it cannot detach from the first slide rail 281 and the second slide rail 282, so as to maintain the positional stability of the first slider 284. Similarly, the second slider 285 is slidably mounted on the second slide rail 282 and the third slide rail 283, and is confined to the second slide rail 282 and the third slide rail 283, so as to maintain the positional stability of the second slider 285.

[0101] The servo motor 291 drives the forward and reverse lead screws 293 to rotate. Under the action of the left-hand lead screw nut seat 294 and the right-hand lead screw nut seat 295, the two hinge connecting plates 265 move closer or further apart, thereby causing the first slider 284 and the second slider 285 to slide on the first slide rail 281, the second slide rail 282 and the third slide rail 283 to move closer or further apart. Since the first slider 284 and the second slider 285 both slide on the second slide rail 282, the height of the scissor support rod 261 is the highest when the first slider 284 and the second slider 285 are in contact. At this time, the lifting mechanism 280 is in the highest adjustment position, that is, the buffer platform 230 and its upper surface are in the highest position.

[0102] In one embodiment, such as Figure 16 and Figure 17 As shown, the connecting mechanism 210 includes a torsion spring 211, a rotating shaft 212, and a mounting base 213; the mounting base 213 is fixed under the buffer platform 230; the rotating shaft 212 is fixed on the mounting base 213, and the carriage connecting plate 220 is rotatably mounted on the rotating shaft 212; the torsion spring 211 is mounted on the rotating shaft 212, and the torsion arm of the torsion spring 211 abuts against the underside of the carriage connecting plate 220, and the torsion spring 211 is used to support the carriage connecting plate 220 when the carriage connecting plate 220 is not connected to the truck 100.

[0103] In this embodiment, combined with Figure 18The connecting mechanism 210 further includes an angle sensor 214, which is signal-connected to the lifting mechanism 280. The angle sensor 214 is used to sense the relative angle between the truck bed connecting plate 220 and the buffer platform 230, and outputs a signal to the lifting mechanism 280. In one embodiment, the angle sensor 214 is fixed to the end of the rotating shaft 212. This structural design allows the lifting device 200 for forklift AGV loading and unloading assistance with a buffer platform to solve the problem that existing loading ramps cannot adapt to forklift AGV loading and unloading while ensuring work efficiency. Furthermore, the lifting device 200 forklift AGV loading and unloading assistance with automatic height adjustment according to the truck height solves the height adjustment problem caused by changes in cargo weight during truck loading and unloading.

[0104] In one embodiment, such as Figure 19 and Figure 20 As shown, the follower rotation mechanism 270 includes a support frame 271, a driven wheel track 272, a driven wheel 273, a driven wheel seat 274, and a wheel track bracket 275. The support frame 271 is disposed adjacent to the platform connecting plate 250. The wheel track bracket 275 is fixed to the support frame 271. The driven wheel track 272 is fixed to the wheel track bracket 275. The driven wheel seat 274 is located below the rotating bridge plate 240 and fixed to one end of the rotating bridge plate 240 adjacent to the platform connecting plate 250. The driven wheel 273 is mounted on the driven wheel seat 274, slides on the driven wheel track 272, and is confined within the wheel track bracket 275. This structural design solves the problem of loading and unloading trucks from the platform during the automatic loading and unloading process of forklift-type AGVs, which is conducive to realizing unmanned operation of the entire warehousing and logistics process.

[0105] Furthermore, in one embodiment, the overall height of the support frame 271 and the wheel track bracket 275 is set according to the height of the platform 300, so that the included angle β between the rotating bridge plate 240 and the platform connecting plate 250 is within a preset angle range, to prevent the slope between the rotating bridge plate 240 and the platform connecting plate 250 from being too large. The preset angle range is as described above. Furthermore, in one embodiment, the height of the support frame 271 is set or adjusted according to the height of the platform 300, so that the height of the support frame 271 is slightly lower than the height of the platform 300, or the height of the support frame 271 is similar to or the same as the height of the platform 300. This structural design has several advantages. First, the lifting device 200 has a buffer platform, enabling unloading of goods at the rear of the truck without affecting efficiency. Second, the height of the truck is monitored in real time using an angle sensor, and the docking height of the lifting device 200 is adjusted in real time using a servo motor, which can adapt to trucks of different heights. Third, the power end of the lifting device 200, such as the servo motor 291, is installed in the scissor lift mechanism, and one end of the rotating bridge plate 240 is designed as a driven wheel 273 and a driven wheel track 272, realizing the lifting coordination of the lifting device 200.

[0106] The following is combined Figures 1 to 20 The example continues to illustrate the lifting device 200 for loading and unloading trucks.

[0107] The lifting device 200 includes a connecting mechanism 210, a carriage connecting plate 220, a buffer platform 230, a rotating bridge plate 240, a platform connecting plate 250, a follower rotating mechanism 270, and a lifting mechanism 280; wherein the follower rotating mechanism 270 and the lifting mechanism 280 can be fixed to the platform 300 or the ground by expansion bolts. In one embodiment, the support frame 271 of the follower rotating mechanism 270, the support structure frame 263 of the lifting mechanism 280, and the servo motor 291 are respectively fixed to the platform 300 by expansion bolts.

[0108] In one embodiment, the truck 100 overlaps with the cargo box connecting plate 220 of the lifting device 200, the cargo box connecting plate 220 is hinged to the buffer platform 230, the buffer platform 230 is hinged to the rotating bridge plate 240, the rotating bridge plate 240 is hinged to the platform connecting plate 250, and the platform connecting plate 250 of the lifting device 200 overlaps with the platform 300.

[0109] The lifting mechanism 280 adopts a scissor lift assembly 260 with a linear movable end to ensure that the buffer platform 230 or its upper surface remains parallel to the ground during movement. The drive assembly 290 uses a forward and reverse lead screw 293 as the transmission component and a servo motor 291 as the power source. The forward and reverse rotation of the servo motor 291 drives the buffer platform 230 to automatically lift and lower.

[0110] The lifting device 200 for loading and unloading the forklift-type AGV has an angle sensor 214 that detects changes in the angle of the truck bed connecting plate 220, thereby automatically identifying the height of the truck 100 and matching the unloading of different trucks 100. It also achieves automatic lifting during the loading and unloading process of the truck 100 to ensure the safety of unmanned operation during unloading.

[0111] The sliding guide rail 10 of the lifting mechanism 280 of the lifting device 200 is fixed to the upper surface of the support structure frame 263 and the bottom surface of the buffer platform 230. Two pairs of sliders 267 slide on the slide rail 266, and each pair of sliders 267 has a fixed scissor mechanism sliding hinge 262. The sliding hinge 262 is connected to one end of the tail of each of the two scissor-type support rods 261 of the lifting mechanism 280. The forward and reverse lead screws 293 are fixed to the upper surface of the support structure frame 263 via bearing supports 264. The servo motor 291 is connected to the forward and reverse lead screws 293 via a coupling 292, for example, through an elastic connection. The forward and reverse lead screws 293 have a left-hand threaded portion 296 and a right-hand threaded portion 297 at both ends. The left-hand threaded portion 296 of the forward and reverse lead screw 293 is equipped with a left-hand lead screw nut seat 294, and the right-hand threaded portion 297 of the forward and reverse lead screw 293 is equipped with a right-hand lead screw nut seat 295. A hinge connecting plate 265 is fixed on the right-hand lead screw nut seat 295, and another hinge connecting plate 265 is fixed on the left-hand lead screw nut seat 294. The two ends of the hinge connecting plate 265 are fixedly connected to the sliding hinges 262 on the left and right sides, respectively. The forward and reverse rotation of the forward and reverse lead screw 293 will drive the left-hand lead screw nut seat 294 and the right-hand lead screw nut seat 295 to move towards each other and away from each other, thereby driving the sliding hinges 262 to move accordingly, causing the entire buffer platform 230 to move up and down.

[0112] The rear end of the lifting device 200's cargo box connecting plate 220 is mounted on a rotating shaft 212, i.e., rotatably connected to the rotating shaft 212. A torsion spring 211 is fitted onto the rotating shaft 212; one end of the torsion spring 211 is fixedly connected to the bottom surface of the buffer platform 230, and the other end abuts against the rear end of the cargo box connecting plate 220. An angle sensor 214 for detecting angles is mounted on the shaft end of the rotating shaft 212. During operation, the rear end of the cargo box connecting plate 220 will be tightly fitted against the truck 100 at a certain angle due to the action of the torsion spring 211. As the truck's height changes, the angle will also change accordingly, thus allowing the angle sensor 214 to monitor the truck's height changes in real time and adjust the lifting height accordingly.

[0113] The support frame 271 of the follower rotation mechanism 270 of the lifting device 200 is fixed on the platform 300. The support frame 271 is equipped with a driven wheel track 272, the driven wheel track 272 is equipped with a driven wheel 273, the driven wheel 273 is fixed to the driven wheel seat 274 by rollers, and the driven wheel seat 274 is fixed to the bottom end of the rotating bridge plate 240.

[0114] In one embodiment, the lifting device 200 is initially in a raised state. Once the truck 100 is in position, the lifting device 200 controls the lifting mechanism 280 to descend via the servo motor 291. The lifting mechanism is complete when the truck bed connecting plate 220 at the rear of the truck bed forms a predetermined angle with the truck 100, such as 5 or 10 degrees. When the height of the truck changes, the angle between the truck bed connecting plate 220 and the truck 100 also changes. The angle sensor 214 feeds back the angle change, and the lifting mechanism 280 can automatically adjust its height in real time.

[0115] In one embodiment, a method for lifting and lowering a loading / unloading truck is implemented using the loading / unloading truck lifting device 200 described in any embodiment. The method includes the steps of: attaching a platform connecting plate 250 to a platform 300; attaching a cargo box connecting plate 220 to a truck 100; obtaining the relative angle α between the cargo box connecting plate 220 and the buffer platform 230; and adjusting the height of the buffer platform 230 according to the relative angle α via a lifting mechanism 280 to accommodate the height of the truck 100. This design, through angle sensing, achieves automatic height adjustment based on the truck's height, solving the height adjustment problem caused by changes in cargo weight during loading and unloading, and greatly improving the efficiency of loading and unloading. Therefore, it is suitable for automated loading and unloading, especially for forklift AGV loading and unloading, solving the problem that traditional loading ramps cannot accommodate forklift AGV loading and unloading, and solving the problem of loading and unloading truck cargo boxes from the platform during automated loading and unloading of forklift AGVs, thus facilitating the realization of unmanned operation throughout the entire warehousing and logistics process.

[0116] It should be noted that other embodiments of this application also include lifting devices and lifting methods for loading and unloading trucks, formed by combining the technical features of the above embodiments.

[0117] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0118] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A lifting device (200) for loading and unloading trucks, characterized in that, include: Connecting mechanism (210); A connecting plate (220) for connecting a freight car (100). The buffer platform (230) is rotatably connected to the carriage connecting plate (220) via the connecting mechanism (210). Platform connecting plate (250), rotatably connected to the buffer platform (230), for connecting the platform (300); and, The lifting mechanism (280) supports the buffer platform (230) below the buffer platform (230) and is used to adjust the height of the buffer platform (230) according to the relative angle between the car body connecting plate (220) and the buffer platform (230) so that the relative angle is within a preset range. When the relative angle is kept outside the preset range, the lifting mechanism (280) issues a stop signal to prevent the operation of loading and unloading the truck, and issues a replacement signal to request the replacement of the trolley with a larger wheel diameter. In use, the highest position of the buffer platform (230) is higher than the lowest position of the carriage connecting plate (220) and the lowest position of the platform connecting plate (250).

2. The lifting device (200) for loading and unloading freight trucks according to claim 1, characterized in that, The lifting device (200) for loading and unloading freight cars also includes a rotating bridge plate (240) and a follower rotating mechanism (270). The rotating bridge plate (240) is disposed between the buffer platform (230) and the platform connecting plate (250), and the rotating bridge plate (240) is rotatably connected to the buffer platform (230) and the platform connecting plate (250) respectively, so that the platform connecting plate (250) is rotatably connected to the buffer platform (230) through the rotating bridge plate (240); The follower rotation mechanism (270) is located below the rotating bridge plate (240) and at one end of the rotating bridge plate (240) adjacent to the platform connecting plate (250). It is used to cooperate with the lifting mechanism (280) to adjust the height of the buffer platform (230) so as to support the rotating bridge plate (240) in the rotating state.

3. The lifting device (200) for loading and unloading freight trucks according to claim 2, characterized in that, The follower rotation mechanism (270) includes a support frame (271), a driven wheel track (272), a driven wheel (273), a driven wheel seat (274), and a wheel track bracket (275). The support frame (271) is disposed adjacent to the platform connecting plate (250); The wheel track bracket (275) is fixed to the support frame (271); The driven wheel track (272) is fixed on the wheel track bracket (275); The movable wheel seat (274) is located below the rotating bridge plate (240) and fixed to one end of the rotating bridge plate (240) adjacent to the platform connecting plate (250); The driven wheel (273) is mounted on the driven wheel seat (274), slides on the driven wheel track (272), and is confined in the wheel track bracket (275); The overall height of the support frame (271) and the wheel track bracket (275) is set according to the height of the platform (300) so that the angle between the rotating bridge plate (240) and the platform connecting plate (250) is within a preset angle range, so as to prevent the slope between the rotating bridge plate (240) and the platform connecting plate (250) from being too large.

4. The lifting device (200) for loading and unloading freight trucks according to claim 1, characterized in that, The lifting mechanism (280) is used to adjust the height of the buffer platform (230) so that the relative angle is within a preset range, or to put the lifting mechanism (280) at an extreme position, the extreme position including the highest adjustment position and the lowest adjustment position.

5. The lifting device (200) for loading and unloading freight trucks according to claim 1, characterized in that, The lifting mechanism (280) includes a scissor lift assembly (260) and a drive assembly (290). The scissor lift assembly (260) is located below the buffer platform (230) and supports the buffer platform (230). The drive assembly (290) drives the scissor lift assembly (260) to adjust the height of the scissor lift assembly (260) according to the relative angle between the carriage connecting plate (220) and the buffer platform (230), so as to adjust the height of the buffer platform (230).

6. The lifting device (200) for loading and unloading freight trucks according to claim 5, characterized in that, The drive assembly (290) includes a servo motor (291), a coupling (292), a forward and reverse lead screw (293), a left-hand lead screw nut seat (294), and a right-hand lead screw nut seat (295). The left-hand threaded portion (296) of the positive and negative lead screw (293) is screwed to the left-hand lead screw nut seat (294), and the right-hand threaded portion (297) of the positive and negative lead screw (293) is screwed to the right-hand lead screw nut seat (295). The left-hand screw nut seat (294) and the right-hand screw nut seat (295) are respectively fixedly connected to the scissor support rod (261) of the scissor lifting assembly (260) to adjust the scissor shape of the scissor support rod (261). The servo motor (291) is connected to the positive and negative lead screws (293) via the coupling (292). By driving the positive and negative lead screws (293) to rotate, the left-hand lead screw nut seat (294) and the right-hand lead screw nut seat (295) move closer or further apart, thereby driving the height of the scissor lift assembly (260) to increase or decrease.

7. The lifting device (200) for loading and unloading freight trucks according to claim 6, characterized in that, The scissor lift assembly (260) also includes a sliding hinge (262), a support structure frame (263), a bearing support (264), a hinge connecting plate (265), a slide rail (266), and a slider (267). The positive and negative lead screws (293) are screwed to the two bearing supports (264) and are limited to the support structure frame (263) by the two bearing supports (264); At least two slide rails (266) are provided under the buffer platform (230) and on the support structure frame (263). Each end of the scissor support rod (261) is connected to a slider (267) through a sliding hinge (262). Each slider (267) is slidably mounted on at least one slide rail (266). The left-hand lead screw nut seat (294) and the right-hand lead screw nut seat (295) are respectively fixedly connected to the two hinge connecting plates (265). Each hinge connecting plate (265) is respectively connected to two opposite sliding hinges (262). The servo motor (291) drives the left-hand lead screw nut seat (294) and the right-hand lead screw nut seat (295) to move closer or further away from each other, so as to drive the two hinge connecting plates (265) to move closer or further away from each other, thereby driving the height of the scissor support rod (261) to increase or decrease.

8. The lifting device (200) for loading and unloading freight trucks according to claim 1, characterized in that, The connecting mechanism (210) includes a torsion spring (211), a rotating shaft (212), and a mounting base (213). The mounting base (213) is fixed under the buffer platform (230); The rotating shaft (212) is fixed on the mounting base (213), and the carriage connecting plate (220) is rotatably mounted on the rotating shaft (212); The torsion spring (211) is mounted on the rotating shaft (212), and the torsion arm of the torsion spring (211) abuts against the underside of the carriage connecting plate (220). The torsion spring (211) is used to support the carriage connecting plate (220) when the carriage connecting plate (220) is not attached to the truck (100).

9. The lifting device (200) for loading and unloading freight cars according to any one of claims 1 to 8, characterized in that, The connecting mechanism (210) includes an angle sensor (214), which is signal-connected to the lifting mechanism (280). The angle sensor (214) is used to sense the relative angle between the carriage connecting plate (220) and the buffer platform (230) and output a signal to the lifting mechanism (280).

10. A method for lifting and lowering a freight truck, characterized in that, The lifting device (200) for loading and unloading freight cars as described in any one of claims 1 to 9 is used, and the lifting method for loading and unloading freight cars includes the following steps: The platform connecting plate (250) is attached to the platform (300); The connecting plate (220) of the carriage is attached to the freight car (100); Obtain the relative angle between the carriage connecting plate (220) and the buffer platform (230); The height of the buffer platform (230) is adjusted by the lifting mechanism (280) according to the relative angle to accommodate the height of the truck (100).

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