Control method of telescopic logistics loading and unloading platform

Abstract

The invention discloses a control method of a telescopic logistics loading and unloading platform, the telescopic logistics loading and unloading platform comprises a first loading and unloading platform, a second loading and unloading platform and a control system, the first loading and unloading platform is of a lifting structure, and the second loading and unloading platform is of a movable structure. A first loading and unloading platform is located on one side of a platform, one end of a first supporting steel plate is hinged to the platform, and the other end is located on the inner side of a loading and unloading opening of a warehouse; the second loading and unloading platform is located below the first loading and unloading platform when not used, the second loading and unloading platform can be moved to the position below the first loading and unloading platform when no forklift passes through, a parking area outside a loading and unloading opening is completely not occupied, and the parking loading and unloading requirements of a large transport vehicle can be met. Besides, the first supporting steel plates have inclined and horizontal states, and the second supporting steel plates also have inclined and horizontal states, so that the first supporting steel plates and the second supporting steel plates can be freely combined according to reagent requirements during actual loading and unloading, the parking requirements of different vehicle types are met, the flexibility degree is high, and the utilization rate of loading and unloading positions is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the field of logistics loading and unloading, and in particular to a control method for a telescopic logistics loading and unloading platform. Background Art

[0002] In the field of logistics and warehousing, the warehouse platform is a key facility in the logistics center. It usually has a certain height to facilitate the transition between goods and carriages, and is a standard feature of modern warehouses. In order to meet the needs of forklifts entering and exiting, there is often a ramp with a slope structure between the warehouse platform and the ground outside the warehouse. Most existing ramps are fixed ramps made of concrete or steel structures. Concrete ramps are mostly fixed ramps. Although the steel structure ramps can be adjusted in angle, they still need to permanently occupy the loading and unloading parking spaces at the edge of the platform. These two types of fixed ramps are applicable to fewer vehicle models and cannot meet the docking needs of a variety of different vehicle models. They can only function when forklifts enter and exit the platform. The rest of the time they are idle, which further makes the corresponding parking spaces unusable, directly reducing the number of effective loading and unloading spaces in the logistics center. This problem is particularly prominent in urban logistics parks with tight land resources. Summary of the Invention

[0003] In view of this, the present invention proposes a control method for a telescopic logistics loading and unloading platform.

[0004] To achieve the above object, the present invention adopts the following technical solutions: The control method of the telescopic logistics loading and unloading platform described in the present invention includes a first loading and unloading platform, a second loading and unloading platform, and a control system. The first loading and unloading platform is a lifting structure, which includes a first steel frame, a first support steel plate welded to the first steel frame, and at least one pair of first hydraulic cylinders arranged below the first support steel plate. One end of the first support steel plate is hinged to the top side edge of the platform. The bottom of the first hydraulic cylinder is hinged to the ground, and the top thereof is hinged to the first support steel plate. The second loading and unloading platform is a mobile structure, which includes a power source, a traveling frame driven by the power source and traveling along a pair of guide rails on the ground, a second steel frame, at least two pairs of second hydraulic cylinders and second support steel plates arranged on the second steel frame, the bottom of each second hydraulic cylinder being hinged to the second steel frame, and the top of the second hydraulic cylinder being hinged to the second hydraulic cylinder, and at least two pairs of second hydraulic cylinders being arranged at intervals on the left and right; The control system includes a controller, a first inclination sensor provided on the first supporting steel plate, and a second inclination sensor provided on the second supporting steel plate, and further includes a first in-position switch and a second in-position switch provided at both ends of the guide rail, wherein the signal output ends of the first inclination sensor, the second inclination sensor, the first in-position switch, and the second in-position switch are connected to the signal input end of the controller, and the control output end of the controller is connected to the control input ends of the control valves of the first hydraulic cylinder and the second hydraulic cylinder; The control method includes controlling a first loading and unloading platform and a second loading and unloading platform, wherein the first loading and unloading platform has a first state and a second state, the first state being a horizontal state and the second state being an inclined state; a first inclination sensor acquires an inclination signal of a first supporting steel plate and transmits the signal to a controller, the controller analyzes the inclination signal to acquire an inclination of the first supporting steel plate and determines a supporting state of the first supporting steel plate; the controller switches the first supporting steel plate between the first state and the second state by controlling the extension and contraction of a first hydraulic cylinder; The second loading and unloading platform has a third state, a fourth state, and a fifth state, the third state being a horizontal state, the fourth state and the fifth state both being inclined supports, and the inclination angle of the second supporting steel plate in the fourth state being consistent with the inclination angle of the first supporting steel plate in the second state; the control of the second loading and unloading platform includes: a second inclination sensor acquiring an inclination signal of the second supporting steel plate and transmitting the signal to a controller, the controller analyzing the inclination signal to acquire the inclination angle of the second supporting steel plate and determine the supporting state of the second supporting steel plate; the controller switching the second supporting steel plate between the third state, the fourth state, and the fifth state by controlling the extension and contraction of the second hydraulic cylinder; The beneficial effects are as follows: the first loading and unloading platform of the present invention is located on one side of the platform, one end of the first supporting steel plate is hinged to the platform, and the other end is located on the inner side of the loading and unloading port of the warehouse; the second loading and unloading platform is located below the first loading and unloading platform when not in use, and the second loading and unloading platform can be moved below the first loading and unloading platform when no forklift passes by, without occupying the parking area outside the loading and unloading port at all, and can meet the docking and loading and unloading needs of large transport vehicles; in addition, the first supporting steel plate of the first loading and unloading platform has inclined and horizontal states, and the second supporting steel plate also has inclined and horizontal states. During actual loading and unloading, they can be arbitrarily combined according to the reagent requirements, thereby meeting the docking needs of different types of vehicles, with a high degree of flexibility, and also significantly improving the utilization rate of the loading and unloading port.

[0005] The present invention obtains the supporting status of each supporting steel plate based on the inclination sensor, and can realize flexible adjustment of the supporting status of the two loading and unloading platforms. Based on the two in-place switches, it can determine the storage status of the second loading and unloading platform and whether it is moved out from under the first loading and unloading platform, thereby improving the degree of automation.

[0006] Preferably, the traveling frame includes a movable crossbeam corresponding to each guide rail above and below, and a connecting beam fixedly connected between the two movable crossbeams. The second steel frame is welded to the connecting beam and has a horizontally arranged mounting plate. The bottom of the second hydraulic cylinder is hinged to the mounting plate and the top is hinged to the second support plate. Advantageously, the present invention includes at least two pairs of second hydraulic cylinders, ensuring load-bearing capacity.

[0007] Preferably, the first hydraulic cylinder is located outside the movable crossbeam, the width of the second support steel plate is smaller than the spacing between the movable crossbeams, and the length of the second support steel plate is greater than the length of the second steel frame. The beneficial effect is that this design ensures the movement and lifting of the second loading and unloading platform.

[0008] Preferably, the maximum horizontal support height of the first loading and unloading platform is higher than the maximum horizontal support height of the second loading and unloading platform; and the width of the first supporting steel plate is smaller than the width of the platform.

[0009] Preferably, each of the movable crossbeams is provided with drive wheels at intervals, each of which is connected to the power source. The power source is preferably a motor + reducer, with each drive wheel corresponding to a set of motor reducers. Multiple motor reducers are utilized to drive the second loading and unloading platform along the guide rails. Alternatively, a high-power motor reducer may be used, connected to the axle of one of the pair of drive wheels via a chain drive assembly.

[0010] The first loading and unloading platform of the present invention is located on one side of the platform, one end of its first supporting steel plate is hinged to the platform, and the other end is located on the inner side of the loading and unloading port of the warehouse; the second loading and unloading platform is located below the first loading and unloading platform when not in use. When no forklift passes by, the second loading and unloading platform can be moved below the first loading and unloading platform, without occupying the parking area outside the loading and unloading port at all, and can meet the parking and loading and unloading needs of large transport vehicles.

[0011] The first supporting steel plate of the first loading and unloading platform has inclined and horizontal states, and the second supporting steel plate also has inclined and horizontal states. During actual loading and unloading, they can be arbitrarily combined according to the reagent requirements, thereby meeting the docking needs of different types of vehicles. It has a high degree of flexibility and significantly improves the utilization rate of the loading and unloading port.

[0012] The present invention obtains the supporting status of each supporting steel plate based on the inclination sensor, and can realize flexible adjustment of the supporting status of the two loading and unloading platforms. Based on the two in-place switches, it can determine the storage status of the second loading and unloading platform and whether it is moved out from under the first loading and unloading platform, thereby improving the degree of automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the first use state of the present invention. In the figure, the second loading and unloading platform is located inside the first loading and unloading platform.

[0014] Figure 2 yes Figure 1 Top view of .

[0015] Figure 3 It is a circuit principle block diagram of the present invention.

[0016] Figure 4 This is the second use state of the present invention. In the figure, the first loading and unloading platform is in the first state, the second loading and unloading platform is in the third state, and the height difference is a relative height difference of 0.6m-1.1m.

[0017] Figure 5 This is the third use state of the present invention. In the figure, the first loading and unloading platform is in the second state, the second loading and unloading platform is in the fourth state, and the inclination angles of the first loading and unloading platform and the second loading and unloading platform are consistent.

[0018] Figure 6 This is the fourth use state of the present invention. In the figure, the first loading and unloading platform is in the first state, the second loading and unloading platform is in the fifth state, and the relative height difference is 1.0m-1.2m. DETAILED DESCRIPTION

[0019] The following describes an embodiment of the present invention in detail with reference to the accompanying drawings. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process. However, the protection scope of the present invention is not limited to the following embodiment.

[0020] It should be noted that, in the description of the present invention, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0021] In the description of the present invention, unless otherwise specified or limited, the terms "connected" and "connection" that may appear should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0022] The present invention proposes a control method for a telescopic logistics loading and unloading platform. The telescopic logistics loading and unloading platform includes a first loading and unloading platform 1, a second loading and unloading platform 2, and a control system. The first loading and unloading platform 1 is located inside the warehouse loading and unloading port. When not in use, the second loading and unloading platform 2 is located below the first loading and unloading platform 1. When needed, the second loading and unloading platform 2 can be moved outward to the outside of the loading and unloading port to accommodate the needs of different vehicles (such as forklifts, tricycles, and urban distribution vehicles), thereby improving utilization. In addition, during actual construction, for existing warehouse platforms, the portion near the loading and unloading port can be hollowed out (the hollowing length can be controlled to be 5m-10m). Taking the renovation of a certain warehouse as an example, the hollowed-out portion has a length × width × height = 8m × 4.4m × 1.4m (of course, this can be adjusted according to actual application during actual construction) to meet the installation requirements of the first loading and unloading platform 1 and the second loading and unloading platform 2. In addition, for new warehouses, a certain amount of installation space can be reserved on one side of the platform.

[0023] Combine Figure 1 It can be seen that the first loading and unloading platform 1 includes a first steel frame 1.1, a first supporting steel plate 1.2 welded to the first steel frame 1.1 and a pair of first hydraulic cylinders 1.3 arranged under the first supporting steel plate 1.2 (of course, it can also be two or more pairs). One end of the first supporting steel plate 1.2 is hinged to the edge of the platform 3; the two first hydraulic cylinders 1.3 are respectively located at the long side edges of the first supporting steel plate 1.2, their bottoms are hinged to the ground outside the platform, and their tops are hinged to the first supporting steel plate 1.2, and the first hydraulic cylinders 1.3 are installed at an angle. Among them, the first loading and unloading platform 1 has a first state and a second state. The first state is a horizontal state. At this time, the piston rod of the first hydraulic cylinder 1.3 is fully extended, and the height of the first supporting steel plate 1.2 is consistent with the platform. For example, the platform height of a certain warehouse is 1.4m, and the support height of the first supporting steel plate in the first state is 1.4m; the first supporting steel plate 1.2 can be used as a temporary platform in the first state to meet the docking and loading and unloading needs of large vehicles, tricycles and urban distribution trucks; the second state is an inclined state. When the piston rod of the first hydraulic cylinder 1.3 is retracted, one end of the first supporting steel plate is lowered, and then it is in an inclined state with the left higher and the right lower, such as the height of the left side is 1.4m, the height of the right side is 0.7m, and the inclination angle is about 10%, providing a ramp with a certain inclination angle for forklifts to facilitate forklifts to enter and exit the warehouse.

[0024] Combine Figure 1-2 It can be seen that two guide rails 4 are arranged in parallel below the first loading and unloading platform 1 and on the ground outside the warehouse. The guide rails 4 are perpendicular to the outer wall of the warehouse. The two guide rails 4 are located between the two first hydraulic cylinders 1.3, which not only ensures the free adjustment of the horizontal and tilt states of the first loading and unloading platform 1, but also ensures the free movement of the second loading and unloading platform 2, so that the adjustments of the first loading and unloading platform and the second loading and unloading platform do not interfere with each other.

[0025] Combine Figure 1-2As can be seen, the second loading and unloading platform 2 includes a power source 2.1, a traveling frame driven by the power source 2.1 and moving along the guide rails 4, two pairs of second hydraulic cylinders 2.4 mounted on the traveling frame (the two pairs of second hydraulic cylinders 2.4 are spaced apart along the guide rails 4), and a second support steel plate 2.5. The traveling frame includes a movable crossbeam 2.2a corresponding to each guide rail 4 above and below, and a connecting beam 2.2b fixedly connected between the two movable crossbeams 2.2a. A second steel frame 2.3 is welded to the traveling frame, and a horizontally mounted steel plate is provided at the top of the second steel frame 2.3. The bottom of the second hydraulic cylinder 2.4 is hinged to the mounting steel plate, and its top is hinged to the second support steel plate 2.5. The first loading and unloading platform has a third state, a fourth state, and a fifth state. The third state is a horizontal state. When the extension lengths of the four second hydraulic cylinders 2.4 are the same, the second support steel plate 2.5 is in a horizontal state. For example, when the second support steel plate 2.5 is located below the first loading and unloading platform 1, the height of the second support steel plate 2.5 can be 0.65m, which is convenient for entry and exit. In addition, in actual use, the horizontal support height of the second support steel plate 2.5 can be adjusted by adjusting the extension length of the second hydraulic cylinders 2.4, so that the horizontal support height range is 0.3m-0.8m. The fourth and fifth states are both inclined supports. The inclination angle of the second support steel plate in the fourth state is consistent with the inclination angle of the first support steel plate in the second state. At this time, the left height of the second support steel plate is 0.7m and the right height is 0m, with an inclination angle of about 10%; the inclination angle of the second support steel plate in the fifth state is 2.5-5%, the left height of the second support steel plate is 0.2m-0.4m, and the right height is 0m, to meet the loading and unloading needs of tricycles and urban distribution vehicles.

[0026] During actual installation, the width of the second support steel plate 2.5 is smaller than the spacing between the movable crossbeams 2.2a, ensuring that the second support steel plate 2.5 can be raised and lowered. The length of the second support steel plate 2.5 is greater than the length of the second steel frame 2.3. The maximum horizontal support height of the first loading and unloading platform 1 is higher than the maximum horizontal support height of the second loading and unloading platform 2, ensuring that the second loading and unloading platform 2 can be stowed within the space below the first loading and unloading platform 1. This allows large transport vehicles to dock and load at the loading and unloading port.

[0027] During actual installation, two drive wheels are arranged at intervals on the moving beam 2.2a, each drive wheel is connected to a power source 2.1, and the power source 2.1 is preferably a motor reducer. Each drive wheel corresponds to a set of motor reducers, and multiple motor reducers are used to drive the second loading and unloading platform 2 to move along the guide rail 4.

[0028] During actual construction, taking the above-mentioned warehouse renovation as an example, the thickness of the first supporting steel plate 1.2 and the second supporting steel plate 2.5 is ≥5mm, and the width of the first supporting steel plate 1.2 is 4.36m, which is slightly smaller than the width of the hollowed-out area (4.4m), meeting the lifting and lowering requirements of the first supporting steel plate 1.2; the length of the movable beam 2.2a is approximately 7.5m and smaller than the length of the hollowed-out part, ensuring that the second loading and unloading platform 2 is completely stored in the space under the first loading and unloading platform 1, avoiding the docking area outside the warehouse to meet the needs of different vehicle models; the width of the second supporting steel plate 2.5 is smaller than the net spacing between the movable beams 2.2a, ensuring that the second supporting steel plate 2.5 can be freely raised and lowered between the two movable beams 2.2a.

[0029] Combine Figure 3 It can be seen that the control system includes a controller, a first inclination sensor provided on the first supporting steel plate 1.2, and a second inclination sensor provided on the second supporting steel plate 2.5. The first inclination sensor is used to detect the inclination of the first supporting steel plate 1.2, and the second inclination sensor is used to detect the inclination of the second supporting steel plate 2.5. The signal output terminals of the first and second inclination sensors are connected to the signal input terminals of the controller. The control system also includes a first position switch and a second position switch arranged along the guide rail 4. The signal output terminals of the first and second position switches are connected to the signal input terminals of the controller. The two position switches can be used to determine the position of the second loading and unloading platform 2 to facilitate the storage and deployment support operations of the second loading and unloading platform 2. Of course, in actual operation, manual observation can also be used to determine the position of the second loading and unloading platform 2. The first hydraulic cylinder 1.3 and the second hydraulic cylinder 2.4 are respectively connected to the hydraulic oil tank through hydraulic pipelines (pumps and valves). The controller can control the extension and retraction states of the first hydraulic cylinder 1.3 and the second hydraulic cylinder 2.4 by controlling the opening and closing of the valves corresponding to the first hydraulic cylinder 1.3 and the second hydraulic cylinder 2.4, and further realize the adjustment of the first support steel plate 1.2 and the second support steel plate 2.5.

[0030] The control method of the present invention includes controlling a first loading and unloading platform 1 and a second loading and unloading platform. Control of the first loading and unloading platform includes: a first inclination sensor acquires an inclination signal from a first support steel plate and transmits it to a controller. The controller analyzes the inclination signal to acquire the inclination of the first support steel plate and determine the support state of the first support steel plate 1.2. When the first support steel plate 1.2 needs to switch states, the controller controls the expansion and contraction of a first hydraulic cylinder 1.3 to switch the first support steel plate 1.2 between the first state and the second state. During this process, the first inclination sensor is used to detect the state of the first support steel plate 1.2. The control of the second loading and unloading platform includes: a second inclination sensor obtains an inclination signal of the second support steel plate 2.5 and transmits it to a controller. The controller analyzes the inclination signal to obtain the inclination of the second support steel plate 2.5 and determines the supporting state of the second support steel plate 2.5. The controller controls the extension and retraction of the second hydraulic cylinder 2.4 to switch the second support steel plate 2.5 between a third state, a fourth state, and a fifth state to meet different usage requirements. The second loading and unloading platform also has a use state of storing and completely moving out of the first loading and unloading platform. The first in-position switch is used to monitor whether the second loading and unloading platform is stored in place, and the second in-position switch is used to monitor whether the second loading and unloading platform is moved out of place, so as to meet actual operation requirements. Among them, the present invention has multiple working states, which are as follows: For large transport vehicles with high carriage heights, their rear carriages need to be docked directly at the platform. To this end, the first loading and unloading platform 1 can be adjusted to a horizontal state, and the second loading and unloading platform 2 can be moved to the space below the first loading and unloading platform 1 to provide parking space for medium and large vehicles. Among them, both ramps are in a horizontal state, the height of the first loading and unloading platform 1 is about 1.4m, and the height of the second loading and unloading platform 2 is 0.65m. For details, see Figure 1 ; For tricycles, the second loading and unloading platform 2 can be completely moved out from under the first loading and unloading platform 1, and the second supporting steel plate 2.5 of the second loading and unloading platform 2 can be adjusted to be higher on the left and lower on the right, with the left side height of about 0.2-0.4m and the inclination angle of about 2.5-5%. The tricycle can be tilted onto the second loading and unloading platform 2; then the supporting state of the first loading and unloading platform 1 can be adjusted to a horizontal state with a height of 0.3m-0.8m (adjusted according to the height of the tricycle). The height of the descending ramp is about 1.4m, and the relative height difference is 0.6m-1.1m. Figure 4 ; When a forklift needs to pass through here, first completely move out the second loading and unloading platform 2, then adjust the second loading and unloading platform 2 so that its left side is 0.7m high and its right side is 0m, so that the second supporting steel plate 2.5 is in an inclined state with the left side higher and the right side lower; adjust the first loading and unloading platform 1 so that its left side is 1.4m high and its right side is 0.7m high, so that the inclination angles of the first supporting steel plate 1.2 and the second supporting steel plate 2.5 are consistent, providing a continuous inclined ramp for the forklift. For details, see Figure 5 ; For urban delivery vehicles, the height of the carriage is slightly lower than the platform. When the urban delivery vehicle docks, first completely move the second loading and unloading platform 2 out, then adjust the inclination angle of the second support steel plate 2.5 so that its left side height is about 0.2-0.4m and the inclination angle is about 2.5-5%, and the urban delivery vehicle is reversed onto the second support steel plate 2.5; the first support steel plate 1.2 is in a horizontal state, and its support height is 1.4m, which can be used as a temporary platform to facilitate loading and unloading of goods. For details, see Figure 6 .

[0031] It should be noted that the controller in the present invention can be a general-purpose processor, a special-purpose processor, a conventional processor, a digital signal processor (DSP), multiple microprocessors, one or more microprocessors associated with a DSP core, a controller, a microcontroller, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) circuit, any other type of integrated circuit (IC), a state machine, a PLC, etc.

[0032] Finally, it should be emphasized that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments without inventive effort, or replace some of the technical features therein with equivalents. Therefore, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A control method for a telescopic logistics loading and unloading platform, characterized in that: The telescopic logistics loading and unloading platform includes a first loading and unloading platform, a second loading and unloading platform and a control system. The first loading and unloading platform is a lifting structure, which includes a first steel frame, a first supporting steel plate welded to the first steel frame, and at least one pair of first hydraulic cylinders arranged below the first supporting steel plate. One end of the first supporting steel plate is hinged to the top side edge of the platform. The bottom of the first hydraulic cylinder is hinged to the ground, and the top is hinged to the first supporting steel plate. The second loading and unloading platform is a mobile structure, which includes a power source, a traveling frame driven by the power source and traveling along a pair of guide rails on the ground, a second steel frame, at least two pairs of second hydraulic cylinders and second support steel plates arranged on the second steel frame, the bottom of each second hydraulic cylinder being hinged to the second steel frame, and the top of the second hydraulic cylinder being hinged to the second hydraulic cylinder, and at least two pairs of second hydraulic cylinders being arranged at intervals on the left and right; The control system includes a controller, a first inclination sensor provided on the first supporting steel plate, and a second inclination sensor provided on the second supporting steel plate, and further includes a first in-position switch and a second in-position switch provided at both ends of the guide rail, wherein the signal output ends of the first inclination sensor, the second inclination sensor, the first in-position switch, and the second in-position switch are connected to the signal input end of the controller, and the control output end of the controller is connected to the control input ends of the control valves of the first hydraulic cylinder and the second hydraulic cylinder; The control method includes controlling a first loading and unloading platform and a second loading and unloading platform, wherein the first loading and unloading platform has a first state and a second state, the first state being a horizontal state and the second state being an inclined state; a first inclination sensor acquires an inclination signal of a first supporting steel plate and transmits the signal to a controller, the controller analyzes the inclination signal to acquire an inclination of the first supporting steel plate and determines a supporting state of the first supporting steel plate; the controller switches the first supporting steel plate between the first state and the second state by controlling the extension and contraction of a first hydraulic cylinder; The second loading and unloading platform has a third state, a fourth state and a fifth state, the third state is a horizontal state, the fourth state and the fifth state are both inclined supports, and the inclination angle of the second support steel plate in the fourth state is consistent with the inclination angle of the first support steel plate in the second state; The control of the second loading and unloading platform includes: the second inclination sensor obtains the inclination signal of the second supporting steel plate and transmits it to the controller, the controller analyzes the inclination signal to obtain the inclination of the second supporting steel plate, and determines the supporting state of the second supporting steel plate; the controller switches the second supporting steel plate between the third state, the fourth state and the fifth state by controlling the extension and contraction of the second hydraulic cylinder.

2. The control method of the telescopic logistics loading and unloading platform according to claim 1, characterized in that: The walking frame includes a movable beam corresponding to each guide rail above and below and a connecting beam fixedly connected between the two movable beams. The second steel frame is welded to the connecting beam and has a horizontally arranged mounting steel plate. The bottom of the second hydraulic cylinder is hinged to the mounting steel plate and the top is hinged to the second support steel plate.

3. The control method of the telescopic logistics loading and unloading platform according to claim 2, characterized in that: The first hydraulic cylinder is located outside the moving beam, the width of the second supporting steel plate is smaller than the spacing between the moving beams, and the length of the second supporting steel plate is greater than the length of the second steel skeleton.

4. The control method of the telescopic logistics loading and unloading platform according to claim 1, characterized in that: The maximum horizontal support height of the first loading and unloading platform is higher than the maximum horizontal support height of the second loading and unloading platform; the width of the first supporting steel plate is smaller than the width of the platform.

5. The control method of the telescopic logistics loading and unloading platform according to claim 1, characterized in that: Each of the movable cross beams is provided with driving wheels at intervals, and each of the driving wheels is connected to the power source.

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