Control methods for telescopic logistics loading and unloading platforms

Abstract

This invention discloses 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, a second loading and unloading platform, and a control system. The first loading and unloading platform has a lifting structure, and the second loading and unloading platform has a movable structure. The first loading and unloading platform is located on one side of the platform, with one end of its first supporting steel plate hinged to the platform and the other end located inside the loading and unloading opening of the warehouse. When not in use, the second loading and unloading platform is located below the first loading and unloading platform. When no forklifts are passing, 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 opening, thus meeting the parking and loading / unloading needs of large transport vehicles. Furthermore, both the first and second supporting steel plates have inclined and horizontal states, allowing for arbitrary combinations according to reagent requirements during actual loading and unloading, thereby meeting the parking needs of different vehicle types. This high degree of flexibility significantly improves the utilization rate of the loading and unloading positions.

Description

Technical Field

[0001] This 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 Technology

[0002] In the logistics and warehousing sector, warehouse platforms are key facilities in logistics centers. They typically have a certain height to facilitate the transfer between goods and trucks, and are standard equipment in modern warehouses. To meet the needs of forklift access, there are often ramps connecting the warehouse platform to the ground outside the warehouse. Existing ramps are mostly fixed ramps made of concrete or steel. Concrete ramps are mostly fixed slopes, and while steel ramps can be adjusted in angle, they still require permanent occupancy of loading and unloading spaces at the edge of the platform. These two types of fixed ramps are suitable for a limited number of vehicle types and cannot meet the parking needs of various vehicle models. They are only useful when forklifts are entering or exiting the platform, remaining idle the rest of the time. This further leads to unusable parking spaces, directly reducing the number of effective loading and unloading positions in the logistics center, a problem particularly prominent in urban logistics parks where land resources are scarce. 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 objectives, the present invention adopts the following technical solution:

[0005] The present invention discloses a control method for a telescopic logistics loading and unloading platform, wherein 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 support steel plate welded to the first steel frame, and at least a pair of first hydraulic cylinders disposed 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 its top is hinged to the first support steel plate.

[0006] The second loading and unloading platform is a mobile structure, which includes a power source, a walking 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 a second support steel plate arranged on the second steel frame. The bottom of each second hydraulic cylinder is hinged to the second steel frame, and the top of each second hydraulic cylinder is hinged to the second hydraulic cylinder. At least two pairs of second hydraulic cylinders are arranged at left and right intervals.

[0007] The control system includes a controller, a first tilt sensor mounted on the first support steel plate and a second tilt sensor mounted on the second support steel plate, and also includes a first position switch and a second position switch mounted at both ends of the guide rail. The signal output terminals of the first tilt sensor, the second tilt sensor, the first position switch and the second position switch are connected to the signal input terminal of the controller, and the control output terminal of the controller is connected to the control input terminal of the control valve of the first hydraulic cylinder and the second hydraulic cylinder.

[0008] The control method includes the control of a first loading and unloading platform and a second loading and unloading platform. The first loading and unloading platform has a first state and a second state. The first state is a horizontal state, and the second state is an inclined state. A first tilt sensor acquires the tilt angle signal of the first supporting steel plate and transmits it to the controller. The controller analyzes the tilt angle signal to obtain the tilt angle of the first supporting steel plate and determines the support 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 retraction of the first hydraulic cylinder.

[0009] The second loading and unloading platform has a third state, a fourth state, and a fifth state. The third state is a horizontal state, and the fourth and fifth states are both inclined supports. The inclination angle of the second support steel plate in the fourth state is the same as the inclination angle of the first support steel plate in the second state. The control of the second loading and unloading platform includes: a second tilt angle sensor acquiring the tilt angle signal of the second support steel plate and transmitting it to the controller; the controller analyzing the tilt angle signal to obtain the tilt angle of the second support steel plate and determining the support state of the second support steel plate; and the controller switching the second support steel plate between the third, fourth, and fifth states by controlling the extension and retraction of the second hydraulic cylinder.

[0010] The beneficial effects are as follows: The first loading and unloading platform of the present invention is located on one side of the platform, with one end of its first supporting steel plate hinged to the platform and the other end located inside 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 forklifts pass, the second loading and unloading platform can be moved to the bottom of the first loading and unloading platform, without occupying the parking area outside the loading and unloading port, which can meet the parking and loading and unloading needs of large transport vehicles; in addition, the first supporting steel plate of the first loading and unloading platform has both inclined and horizontal states, and the second supporting steel plate also has both inclined and horizontal states. In actual loading and unloading, it can be arbitrarily combined according to the reagent requirements, thereby meeting the parking needs of different vehicle types. It has a high degree of flexibility and significantly improves the utilization rate of the loading and unloading port.

[0011] This invention uses tilt sensors to obtain the support status of each support steel plate, enabling flexible adjustment of the support status of the two loading and unloading platforms. Based on two position switches, it can determine whether the second loading and unloading platform is properly stored and whether it has been moved out from under the first loading and unloading platform, thereby improving the degree of automation.

[0012] Preferably, the traveling frame includes movable crossbeams corresponding vertically to each of the guide rails and connecting beams fixed between two of the movable crossbeams. 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 supporting steel plate. The beneficial effect is that the present invention has at least two pairs of second hydraulic cylinders, ensuring load-bearing capacity.

[0013] Preferably, the first hydraulic cylinder is located outside the moving crossbeam, the width of the second supporting steel plate is less than the spacing between the moving crossbeams, and the length of the second supporting steel plate is greater than the length of the second steel frame. The advantage is that this design ensures the movement and lifting of the second loading / unloading platform.

[0014] Preferably, the maximum horizontal support height of the first loading and unloading platform is higher than that of the second loading and unloading platform; and the width of the first support steel plate is smaller than the width of the platform.

[0015] Preferably, each of the moving crossbeams is provided with a drive wheel at intervals, and each drive wheel is connected to the power source. The power source is preferably a motor and a reducer, with each drive wheel corresponding to a set of motor and reducer. Multiple motors and reducers are used to drive the second loading / unloading platform to move along the guide rail. Alternatively, a single high-power motor and reducer can be used, connected to the axle of one pair of drive wheels via a chain drive assembly.

[0016] The first loading and unloading platform of the present invention is located on one side of the platform, with one end of its first supporting steel plate hinged to the platform and the other end located inside 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, the second loading and unloading platform can be moved to the bottom of the first loading and unloading platform, without occupying the parking area outside the loading and unloading port, which can meet the parking and loading and unloading needs of large transport vehicles.

[0017] The first support steel plate of the first loading and unloading platform has both inclined and horizontal states, and the second support steel plate also has both inclined and horizontal states. In actual loading and unloading, it can be arbitrarily combined according to reagent requirements, thereby meeting the parking needs of different vehicle models. It has a high degree of flexibility and significantly improves the utilization rate of the loading and unloading port.

[0018] This invention uses tilt sensors to obtain the support status of each support steel plate, enabling flexible adjustment of the support status of the two loading and unloading platforms. Based on two position switches, it can determine whether the second loading and unloading platform is properly stored and whether it has been moved out from under the first loading and unloading platform, thereby improving the degree of automation. Attached Figure Description

[0019] Figure 1This is the first usage state of the present invention. In the figure, the second loading and unloading platform is located inside the first loading and unloading platform.

[0020] Figure 2 yes Figure 1 Top view.

[0021] Figure 3 This is a circuit block diagram of the present invention.

[0022] Figure 4 This is the second usage 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.

[0023] Figure 5 This is the third usage 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 tilt angles of the first loading and unloading platform and the second loading and unloading platform are the same.

[0024] Figure 6 This is the fourth usage state of the present invention. In the figure, the first loading and unloading platform is in the first state, and the second loading and unloading platform is in the fifth state, with a relative height difference of 1.0m-1.2m. Detailed Implementation

[0025] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. These embodiments are implemented based on the technical solution of the present invention, and detailed implementation methods and specific operation processes are given. However, the scope of protection of the present invention is not limited to the following embodiments.

[0026] It should be noted that, in the description of this invention, relational terms such as “first” and “second” are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0027] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] This 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 loading and unloading port of the warehouse. 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 meet 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 of the platform near the loading and unloading port can be excavated (the excavation length can be controlled between 5m and 10m). Taking a warehouse renovation as an example, the length × width × height of the excavated portion is 8m × 4.4m × 1.4m (of course, this can be adjusted according to the actual application during construction) to meet the installation requirements of the first loading and unloading platform 1 and the second loading and unloading platform 2. Furthermore, for newly built warehouses, a certain amount of installation space can be reserved on one side of the platform.

[0029] Combination Figure 1 It is known that the first loading and unloading platform 1 includes a first steel frame 1.1, a first support steel plate 1.2 welded to the first steel frame 1.1, and a pair of first hydraulic cylinders 1.3 (or two or more pairs) located below the first support steel plate 1.2. One end of the first support steel plate 1.2 is hinged to the edge of the platform 3. The two first hydraulic cylinders 1.3 are located at the long edge of the first support steel plate 1.2, with their bottoms hinged to the ground outside the platform and their tops hinged to the first support steel plate 1.2. The first hydraulic cylinders 1.3 are installed at an angle. The first loading and unloading platform 1 has a first state and a second state. The first state is a horizontal state, in which 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 that of the platform. For example, if the height of a warehouse platform is 1.4m, the supporting height of the first supporting steel plate in the first state is 1.4m. The first supporting steel plate 1.2 in the first state can serve as a temporary platform to meet the parking and loading / 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 retracts, one end of the first supporting steel plate descends, thus placing it in an inclined state with the left side higher than the right side. For example, the left side is 1.4m high and the right side is 0.7m high, with an inclination angle of about 10%, providing a ramp with a certain inclination angle for forklifts to enter and exit the warehouse.

[0030] Combination Figure 1-2 It is known that two guide rails 4 are set in parallel on the ground below the first loading and unloading platform 1 and 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. This not only ensures the free adjustment of the first loading and unloading platform 1 in horizontal and tilted states, but also ensures the free movement of the second loading and unloading platform 2, so that the adjustment of the first loading and unloading platform and the second loading and unloading platform does not interfere with each other.

[0031] Combination Figure 1-2It is known that the second loading and unloading platform 2 includes a power source 2.1, a traveling frame driven by the power source 2.1 and traveling along the guide rail 4, two pairs of second hydraulic cylinders 2.4 (the two pairs of second hydraulic cylinders 2.4 are spaced apart along the direction of the guide rail 4) and a second support steel plate 2.5. The traveling frame includes a movable crossbeam 2.2a corresponding to each guide rail 4 vertically and a connecting beam 2.2b fixed between the two movable crossbeams 2.2a. A second steel frame 2.3 is welded on the traveling frame. The top of the second steel frame 2.3 has a horizontally arranged mounting steel plate. 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.

[0032] The first loading and unloading platform has a third, fourth, and fifth state. The third state is a horizontal state. When the extension lengths of the four second hydraulic cylinders 2.4 are consistent, the second support steel plate 2.5 is in a horizontal state. If 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 also facilitates 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 its horizontal support height ranges from 0.3m to 0.8m.

[0033] Both the fourth and fifth states are inclined supports. The inclination angle of the second support steel plate in the fourth state is the same as that of the first support steel plate in the second state. At this time, the second support steel plate is 0.7m high on the left and 0m high on the right, with an inclination angle of about 10%. The inclination angle of the second support steel plate in the fifth state is 2.5-5%, and the height of the left side of the second support steel plate is 0.2m-0.4m, and the height of the right side is 0m, in order to meet the loading and unloading needs of tricycles and urban distribution vehicles.

[0034] During actual installation, the width of the second support steel plate 2.5 is less than the spacing between the movable crossbeams 2.2a to ensure the lifting and lowering operation of the second support steel plate 2.5; 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 stored in the space below the first loading and unloading platform 1, thus enabling the storage of the second loading and unloading platform 2. At this time, large transport vehicles can be parked to meet the parking and loading / unloading needs of large transport vehicles at this loading and unloading port.

[0035] In actual installation, two drive wheels are spaced apart on the moving crossbeam 2.2a. Each drive wheel is connected to a power source 2.1. The power source 2.1 is preferably a motor reducer. Each drive wheel corresponds to a set of motor reducers. Multiple motor reducers are used to drive the second loading and unloading platform 2 to move along the guide rail 4.

[0036] In actual construction, taking the above 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. The width of the first supporting steel plate 1.2 is 4.36m, slightly smaller than the width of the excavated area (4.4m), which meets the lifting requirements of the first supporting steel plate 1.2. The length of the moving crossbeam 2.2a is about 7.5m and smaller than the length of the excavated part, ensuring that the second loading and unloading platform 2 is completely housed in the space below the first loading and unloading platform 1, thus clearing the parking area outside the warehouse and meeting the needs of different vehicle models. The width of the second supporting steel plate 2.5 is smaller than the net distance between the moving crossbeams 2.2a, ensuring that the second supporting steel plate 2.5 can freely rise and fall between the two moving crossbeams 2.2a.

[0037] Combination Figure 3 It is known that the control system includes a controller, a first tilt sensor installed on the first support steel plate 1.2 and a second tilt sensor installed on the second support steel plate 2.5. The first tilt sensor is used to detect the tilt of the first support steel plate 1.2, and the second tilt sensor is used to detect the tilt of the second support steel plate 2.5. The signal output terminals of the first tilt sensor and the second tilt sensor are connected to the signal input terminal of the controller.

[0038] The control system also includes a first position switch and a second position switch installed 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 position of the second loading and unloading platform 2 can be determined using the two position switches to facilitate the storage and deployment of the second loading and unloading platform 2. Of course, in actual operation, the position of the second loading and unloading platform 2 can also be determined by manual observation.

[0039] The first hydraulic cylinder 1.3 and the second hydraulic cylinder 2.4 are connected to the hydraulic oil tank through hydraulic pipelines (pump and valve). The controller can control the extension and retraction state 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.

[0040] The control method of the present invention includes the control of a first loading and unloading platform 1 and a second loading and unloading platform. The control of the first loading and unloading platform includes: a first tilt sensor acquiring the tilt angle signal of a first supporting steel plate and transmitting it to a controller; the controller analyzing the tilt angle signal to obtain the tilt angle of the first supporting steel plate and determining the support state of the first supporting steel plate 1.2. When the first supporting steel plate 1.2 needs to switch states, the controller controls the extension and retraction of a first hydraulic cylinder 1.3 to switch the first supporting steel plate 1.2 between a first state and a second state. During this process, the first tilt sensor detects the condition of the first supporting steel plate 1.2.

[0041] The control of the second loading and unloading platform includes: the second tilt sensor acquiring the tilt signal of the second support steel plate 2.5 and transmitting it to the controller; the controller analyzing the tilt signal to obtain the tilt angle of the second support steel plate 2.5 and determining the support state of the second support steel plate 2.5; the controller controlling the extension and retraction of the second hydraulic cylinder 2.4 to switch the second support steel plate 2.5 between the third state, the fourth state and the fifth state to meet different usage requirements;

[0042] The second loading / unloading platform also has the ability to be stored in and completely removed from the first loading / unloading platform. A first positioning switch monitors whether the second loading / unloading platform is properly stored, and a second positioning switch monitors whether the second loading / unloading platform is properly removed, to meet practical operational needs. This invention has multiple operating states, as detailed below:

[0043] For large transport vehicles with high cargo box heights, their rear cargo box needs to be parked directly at the platform. To address this, the first loading / unloading platform 1 can be adjusted to a level position, and the second loading / unloading platform 2 can be moved to the space below the first loading / unloading platform 1 to provide parking space for medium and large vehicles. Both ramps are level; the height of the first loading / unloading platform 1 is approximately 1.4m, and the height of the second loading / unloading platform 2 is 0.65m. See details below. Figure 1 ;

[0044] For tricycles, the second loading / unloading platform 2 can be completely removed from under the first loading / unloading platform 1. Adjust the second support steel plate 2.5 of the second loading / unloading platform 2 so that the left side is higher than the right, with the left side height approximately 0.2-0.4m and the tilt angle approximately 2.5-5%. Then, back the tricycle onto the second loading / unloading platform 2. Next, adjust the support of the first loading / unloading platform 1 to a horizontal position, with a height of 0.3m-0.8m (adjusted according to the height of the tricycle). The height of the descending ramp is approximately 1.4m, with a relative height difference of 0.6m-1.1m. See details... Figure 4 ;

[0045] When a forklift needs to pass through, first completely remove the second loading / unloading platform 2, then adjust it so that its left side is 0.7m high and its right side is 0m high, so that the second support plate 2.5 is tilted with the left side higher than the right side; adjust the first loading / unloading platform 1 so that its left side is 1.4m high and its right side is 0.7m high, and the tilt angles of the first support plate 1.2 and the second support plate 2.5 are the same, providing a continuous inclined ramp for the forklift. See details. Figure 5 ;

[0046] For urban delivery vehicles, the height of their cargo compartments is slightly lower than the platform. When an urban delivery vehicle stops, first completely remove the second loading / unloading platform 2, then adjust the tilt angle of the second support steel plate 2.5 so that its left side is approximately 0.2-0.4m high and its tilt angle is approximately 2.5-5%. Then, back the urban delivery vehicle onto the second support steel plate 2.5. The first support steel plate 1.2 is in a horizontal position with a support height of 1.4m, which can serve as a temporary platform for convenient loading and unloading of goods. See details... Figure 6 .

[0047] It should be noted that the controller in this 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.

[0048] 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 foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Therefore, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope 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 support steel plate welded to the first steel frame, and at least one pair of first hydraulic cylinders disposed 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 its top is hinged to the first support steel plate. The second loading and unloading platform is a mobile structure, which includes a power source, a walking 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 a second support steel plate arranged on the second steel frame. The bottom of each second hydraulic cylinder is hinged to the second steel frame, and the top of each second hydraulic cylinder is hinged to the second hydraulic cylinder. At least two pairs of second hydraulic cylinders are arranged at left and right intervals. The control system includes a controller, a first tilt sensor mounted on the first support steel plate and a second tilt sensor mounted on the second support steel plate, and also includes a first position switch and a second position switch mounted at both ends of the guide rail. The signal output terminals of the first tilt sensor, the second tilt sensor, the first position switch and the second position switch are connected to the signal input terminal of the controller, and the control output terminal of the controller is connected to the control input terminal of the control valve of the first hydraulic cylinder and the second hydraulic cylinder. The control method includes the control of a first loading and unloading platform and a second loading and unloading platform. The first loading and unloading platform has a first state and a second state. The first state is a horizontal state, and the second state is an inclined state. A first tilt sensor acquires the tilt angle signal of the first supporting steel plate and transmits it to the controller. The controller analyzes the tilt angle signal to obtain the tilt angle of the first supporting steel plate and determines the support 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 retraction of the 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, and the fourth and fifth states are both inclined supports. The inclination angle of the second support steel plate in the fourth state is the same as 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 tilt sensor acquiring the tilt angle signal of the second support steel plate and transmitting it to the controller; the controller analyzing the tilt angle signal to obtain the tilt angle of the second support steel plate and determining the support state of the second support steel plate; the controller switching the second support steel plate between the third state, the fourth state and the fifth state by controlling the extension and retraction of the second hydraulic cylinder.

2. The control method for the telescopic logistics loading and unloading platform according to claim 1, characterized in that: The traveling frame includes a movable crossbeam corresponding to each of the guide rails and a connecting beam fixed between two of the movable crossbeams. 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 for the telescopic logistics loading and unloading platform according to claim 2, characterized in that: The first hydraulic cylinder is located on the outside of the moving crossbeam, the width of the second supporting steel plate is less than the spacing between the moving crossbeams, and the length of the second supporting steel plate is greater than the length of the second steel frame.

4. The control method for 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 that of the second loading and unloading platform; the width of the first support steel plate is smaller than the width of the platform.

5. The control method for the telescopic logistics loading and unloading platform according to claim 2, characterized in that: Each of the moving crossbeams is provided with a drive wheel at intervals, and each drive wheel is connected to the power source.

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