A main roadway portal loading and unloading elevator

Abstract

The present application relates to a kind of main roadway mouth loading and unloading with elevator, including two groups of installation column assembly, lifting plate and power device;Two groups of installation column assembly are oppositely parallel and arranged in the walking guide rail of four-way vehicle, and installation column assembly constitutes a four-way vehicle stay station between two groups of installation column assembly;Installation column assembly includes two installation columns;Two installation columns of each group of installation column assembly or / and two installation columns of two groups of installation column assembly same side are slidably connected with lifting plate, and constitute two groups or four groups of lifting unit;One end of lifting plate is rotatably connected with first connecting rod, and second connecting rod is rotatably connected on installation column;The free end of first connecting rod and second connecting rod is rotatably connected as a whole, and constitutes driving end;Lifting plate is connected with the power end of power device by driving end, and under the power drive, first connecting rod and second connecting rod are driven to move towards or away from driving end as rotating point, and drive lifting plate to move up and down.The present application lifting machine loading and unloading efficiency is high.

Description

TECHNICAL FIELD

[0001] The application relates to a main lane opening loading and unloading elevator, and belongs to the technical field of automatic warehousing logistics. BACKGROUND

[0002] With the rise of land cost and labor cost, the concept of intensive storage is increasingly concerned by logistics companies and e-commerce companies. The automatic stereoscopic warehouse has become an indispensable storage technology for enterprise logistics and production management due to its high space utilization and strong in-out warehouse capacity, and its application in the automobile, chemical, electronic and tobacco industries has been increasing year by year. In the next few years, one of the technology development trends of the automatic stereoscopic warehouse system is high speed, high efficiency and high density.

[0003] In order to adapt to the intensive storage of pallet goods and improve the number of stored goods per unit space, a four-way shuttle type handling robot, also known as a four-way vehicle, is generally used to complete the transfer of pallet goods. In the existing warehouse operation, the four-way vehicle runs to the loading and unloading station, and the goods are assembled or unloaded by a forklift or a forklift lifting machine. The existing loading and unloading method has certain problems: 1. Low loading and unloading efficiency. When loading and unloading goods, multi-layer goods are usually stacked on the pallet. When loading and unloading goods, the goods need to be unloaded or loaded layer by layer, so the four-way vehicle needs to be in a waiting state during the loading and unloading process. This will result in low utilization efficiency of the four-way vehicle and insufficient number of four-way vehicles at other workstations in the warehouse system. 2. Four-way vehicle damage accidents are prone to occur. When loading and unloading goods, the forks of the forklift or forklift lifting machine are used to fork or place the pallet. Since the pallet is placed on the four-way vehicle, the forks are prone to misalignment during forking or placement, causing damage to the four-way vehicle. 3. In the existing warehouse system, the main lane running guide rail is mainly used for the four-way vehicle to run between the loading station and the unloading station, and the sub-lane is mainly used for the target shelf to run. Therefore, there are many four-way vehicles on the main lane. In order to improve the in-out warehouse efficiency, the forklift or forklift lifting machine basically faces the sub-lane when loading and unloading goods. The four-way vehicle needs to enter the sub-lane from the main lane before loading and unloading goods, which further reduces the in-out warehouse efficiency. Therefore, a four-way vehicle loading and unloading elevator is needed to solve the problems of low loading efficiency and four-way vehicle damage in the prior art. SUMMARY

[0004] In view of the problems and deficiencies in the prior art, the application provides a main lane opening loading and unloading elevator, which aims to solve the above technical problems.

[0005] To achieve the above objectives, this application provides the following technical solution: a hoist for loading and unloading goods at the main roadway entrance, comprising two sets of mounting column assemblies, a lifting plate, and a power unit; the two sets of mounting column assemblies are arranged parallel to each other on the travel guide rail of a four-way vehicle, and the two sets of mounting column assemblies form a four-way vehicle stopping station; each set of mounting column assemblies includes two mounting columns, and the two sets of mounting column assemblies constitute four mounting columns; a lifting plate is slidably connected between the two mounting columns of each set of mounting column assemblies and / or between the two mounting columns on the same side of the two sets of mounting column assemblies, forming two or four sets of lifting units; a first connecting rod is rotatably connected to one end of the lifting plate, and a second connecting rod is rotatably connected to the mounting column; the free ends of the first connecting rod and the second connecting rod are rotatably connected to each other as a whole, forming a drive end; the lifting plate is connected to the power end of the power unit through the drive end, and under the power drive, drives the first connecting rod and the second connecting rod to move in opposite directions or in opposite directions with the drive end as the rotation point, thereby driving the lifting plate to move up and down along the mounting columns.

[0006] Specifically, the bottom of the two mounting columns of each set of mounting column assemblies is connected to a first connecting plate, forming two connecting vertical beams; a second connecting plate is connected between the two mounting columns on the same side of the two sets of mounting column assemblies, forming two connecting horizontal beams; the two connecting vertical beams and the two connecting horizontal beams constitute the support frame of the mounting column assembly.

[0007] Specifically, the four-way vehicle's travel guide rails include two first-lane guide rails and two second-lane guide rails; the first-lane guide rails and second-lane guide rails are arranged perpendicularly to each other, forming the main lane travel guide rail and the sub-lane travel guide rail; the two first-lane guide rails, which serve as sub-lane travel guide rails, are arranged parallel to each other between two connecting crossbeams; the two second-lane guide rails, which form the main lane travel guide rails, are arranged parallel to each other between two connecting vertical beams; the first-lane guide rails or the second-lane guide rails are provided with clearance grooves for the first-lane guide rails and the second-lane guide rails to be installed crosswise.

[0008] Specifically, lifting plates are slidably connected between the mounting columns on both sides of the main tunnel travel guide rail, forming two sets of lifting units.

[0009] Specifically, the lifting platform includes a platform body and two slide rails; the two slide rails are installed parallel to each other on the mounting column; the platform body is fixedly connected to the two slide rails through its bottom sides and is slidably installed on the mounting column; one end of each of the two slide rails is hinged with a first connecting rod, and the mounting column where the slide rails are located is hinged with a second connecting rod.

[0010] Specifically, the power unit includes a drive motor, a transmission chain, a drive gear, a synchronous chain, and two drive components; the two drive components are connected one-to-one with two sets of lifting units; each drive component includes a rotating shaft, two third connecting rods, and two fourth connecting rods; a rotating shaft is rotatably connected between the two mounting columns of each lifting unit; a transmission gear is fixedly mounted on one end of the rotating shaft; the two rotating shafts of the two drive components are synchronously connected by a synchronous chain sleeved on the outside of the transmission gears of the two rotating shafts; third connecting rods are fixedly mounted on both sides of the rotating shaft; a fourth connecting rod is rotatably connected to the end of the third connecting rod away from the rotating shaft; the end of the fourth connecting rod away from the third connecting rod is rotatably connected to the drive end; the first connecting rod, the second connecting rod, the third connecting rod, and the fourth connecting rod constitute a crank-rocker connection mechanism; one of the two rotating shafts has a drive gear connected to the end away from the transmission gear, and the drive gear is connected to the power end of the drive motor through a transmission chain.

[0011] Specifically, the hinge point between the first connecting rod and the slide rail is defined as the first hinge point; the hinge point between the second connecting rod and the mounting column is defined as the second hinge point. The line connecting the first and second hinge points is perpendicular to the connecting beam. This arrangement allows the first and second connecting rods, driven by the drive motor, to move in opposite directions around the drive end, causing the lifting platform to rise. When the drive end, the first hinge point, and the second hinge point are aligned, i.e., when the lifting platform reaches its highest position, the weight of the goods on the lifting platform is directly transferred to the mounting column via the first and second connecting rods. The mounting column bears the load, while the drive motor bears almost no load. This reduces the risk of damage to the drive motor under heavy load, extends its service life, and improves the safety of the lifting platform during loading and unloading.

[0012] Specifically, the four-way vehicle's travel guide rail is equipped with a lifting plate receiving slot at the corresponding position of the lifting plate; when the lifting plate slides along the mounting column to the lifting plate receiving slot, the height of the lifting plate surface is matched with the height of the four-way vehicle's travel guide rail.

[0013] Specifically, the mounting column is equipped with several photoelectric sensors along the radial direction; the lifting plate is equipped with a light-shielding plate; there are two photoelectric sensors; the two photoelectric sensors are defined as a low-position photoelectric sensor and a high-position photoelectric sensor along the radial direction; the installation position of the low-position photoelectric sensor is consistent with the position of the receiving slot of the lifting plate; the drive end is driven by the power of the power device, and when the drive end, the first hinge point and the second hinge point are in a straight line, the position of the lifting plate is the installation position of the high-position photoelectric sensor.

[0014] Specifically, at least one of the two connecting beams is rotatably connected to a baffle. One end of the baffle, near its end, is rotatably connected to the connecting beam, forming a connecting end. Its free end rotates along the connecting point, forming a blocking end. The connecting end of the baffle is installed within the movement trajectory of the third link. Driven by the drive motor, the third link rotates about its pivot axis towards the baffle. When the third link reaches the baffle and abuts against its connecting end, its free end rises along the connecting point. Driven by the drive motor, the third link rotates about its pivot axis away from the baffle. After the third link separates from the baffle, the free end of the baffle falls back down along the connecting point under gravity. This arrangement, through the movement of the third link, achieves the raising and lowering of the baffle, thus blocking the travel guide rail of the four-way vehicle. When the third link moves downward, the connecting end of the stop lever is pressed down, and the free end of the baffle rises along the rotating connection point, thus acting as a blockage. When the third link rises, the connecting end of the baffle separates from the third link, and the free end of the baffle falls due to gravity, thus releasing the blocking effect.

[0015] Compared with the prior art, the beneficial effects of this application are as follows:

[0016] The main aisle loading and unloading elevator of this application consists of two sets of mounting column assemblies with a lifting platform slidingly installed between them, forming two lifting units. The two sets of mounting columns are installed on the ground or on automated storage racks, so that the two sets of mounting column assemblies are arranged parallel to each other at the main aisle entrance of the four-way vehicle's travel guide rail, forming a four-way vehicle stopping position between the two sets of mounting column assemblies. When loading goods, a forklift or a forklift-equipped lift is used to place the pallet loaded with goods onto the lifting platform of the two lifting units. The four-way vehicle then moves along the travel guide rail to the stopping position, the lifting platform descends along the mounting columns to place the pallet loaded with goods onto the four-way vehicle, and then the lifting platform rises, allowing the four-way vehicle to transfer the goods to the subsequent working position along the travel rail. When unloading goods is required, the four-way trolley loaded with the goods pallet first moves along the guide rail to the stopping position. Then, the lifting platform rises along the mounting column and abuts against the pallet. As the lifting platform continues to rise, the pallet separates from the four-way trolley, which can then move away along the guide rail. The pallet loaded with goods is then unloaded from the pallet using a forklift or a forklift lift. The lifting system of this application has high efficiency in loading and unloading goods, and is particularly suitable for main aisle entrances, improving the efficiency of goods entering and leaving the warehouse.

[0017] Based on the foregoing, and considering that the lifting platform needs to raise the goods, in order to improve the load-bearing capacity of the lifting machine in this application, a connecting crossbeam and a connecting vertical beam are set between the bottom of the mounting columns to form a bottom support frame. Since the two aisle guide rails constituting the traveling guide rails are intersecting each other, in order to ensure that the aisle guide rails in both directions are installed in the same plane and to ensure the normal movement of the four-way vehicle, a clearance groove is set on the first aisle guide rail or the second aisle guide rail. This allows the traveling guide rails to be installed crosswise and in the same plane, ensuring that the four-way vehicle can move along the main aisle traveling guide rail to the stopping position, thereby improving loading efficiency.

[0018] Based on the foregoing, and considering that the travel guide rail is connected to the vertical or horizontal beams, while the lifting platform is mounted between two mounting columns and slides along them, a lifting platform receiving groove is provided on the travel guide rail to avoid installation space conflicts between the lifting platform and the travel guide rail. This ensures that the lifting platform and the travel guide rail do not conflict in terms of installation space, thereby achieving effective connection between the travel guide rail and the lifting platform of the four-way vehicle and improving the stability of the four-way vehicle.

[0019] Building upon the foregoing, this application's two lifting units are powered by a single drive motor, driving two drive components to achieve simultaneous movement of the two lifting platforms. The components are simple in structure and low in manufacturing cost. The lifting platforms lift the pallets, allowing for loading and unloading by forklifts or forklift lifts, preventing damage to four-way vehicles and ensuring high production safety. Simultaneously, the two sides of the lifting platforms form a crank-rocker structure with four connecting rods, resulting in short lifting and lowering times and further improving the efficiency of goods entering and leaving the warehouse. The four-bar structure requires only about one-quarter of the weight of the goods, reducing the manufacturing cost of the drive motor.

[0020] Building upon the aforementioned design, at least one of the two connecting beams is rotatably connected to a baffle, allowing the baffle to rise or fall along with the lifting platform. This ensures that when the lifting platform rises, the baffle rises to prevent other four-way vehicles from entering the stopping position. When the lifting platform descends, the baffle descends, allowing four-way vehicles to pass freely, preventing them from falling off the guide rails due to collisions. Furthermore, the movement of the baffle requires no additional power, resulting in low manufacturing costs. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the hoist used for loading and unloading goods at the main tunnel entrance in this embodiment;

[0022] Figure 2 for Figure 1 Enlarged diagram of point A in the middle.

[0023] In the diagram: 1. Lifting platform; 2. Mounting column; 3. Connecting vertical beam; 4. Connecting horizontal beam; 5. First aisle guide rail; 6. Second aisle guide rail; 7. Clearance groove; 8. Drive motor; 9. Transmission chain; 10. Synchronous chain; 11. Rotating shaft; 12. Baffle; 13. First connecting rod; 14. Second connecting rod; 15. Third connecting rod; 16. Fourth connecting rod; 17. First hinge point; 18. Second hinge point; 19. Drive end; 20. Shelf upright. Detailed Implementation

[0024] The present application will be further described below with reference to the accompanying drawings in the embodiments of the present application. For clarity, in this embodiment, the loading and unloading elevator at the main aisle entrance is fixedly installed on the shelf columns 20 of the multi-level storage rack of the automated storage system via mounting columns. Four-way vehicle travel rails are laid between the shelves of each storage rack.

[0025] Please see Figures 1-2 This embodiment discloses a hoist for loading and unloading goods at the main tunnel entrance, including two sets of mounting column assemblies, a lifting plate 1, and a power unit; the two sets of mounting column assemblies are arranged parallel to each other on the travel guide rail of a four-way vehicle, and the two sets of mounting column assemblies form a four-way vehicle stopping station; each set of mounting column assemblies includes two mounting columns 2, and the two sets of mounting column assemblies constitute four mounting columns 2; the lifting plate 1 is slidably connected between the two mounting columns of each set of mounting column assemblies and / or the two mounting columns on the same side of the two sets of mounting column assemblies, forming two or four sets of lifting units; one end of the lifting plate 1 is rotatably connected to a first connecting rod 13, and a second connecting rod 14 is rotatably connected to the mounting column; the free ends of the first connecting rod 13 and the second connecting rod 14 are rotatably connected to each other as a whole, forming a drive end 19; the lifting plate 1 is connected to the power end of the power unit through the drive end, and under the power drive, it drives the first connecting rod 13 and the second connecting rod 14 to move towards or away from each other with the drive end as the rotation point, thereby driving the lifting plate 1 to move up and down along the mounting columns.

[0026] Furthermore, the bottom of the two mounting columns of each set of mounting column assemblies is connected to a first connecting plate, forming two connecting vertical beams 3; a second connecting plate is connected between the two mounting columns on the same side of the two sets of mounting column assemblies, forming two connecting horizontal beams 4; the two connecting vertical beams 3 and the two connecting horizontal beams 4 constitute the support frame of the mounting column assembly.

[0027] Furthermore, the four-way vehicle's travel guide rails include two first lane guide rails 5 and two second lane guide rails 6; the first lane guide rails 5 and the second lane guide rails 6 are arranged perpendicularly to each other, forming the main lane travel guide rail and the sub-lane travel guide rail; the two first lane guide rails 5, serving as sub-lane travel guide rails, are arranged parallel to each other between two connecting crossbeams 4; the two second lane guide rails 6, forming the main lane travel guide rail, are arranged parallel to each other between two connecting vertical beams 3; the first lane guide rails or the second lane guide rails are provided with clearance grooves 7 for the first lane guide rails and the second lane guide rails to be installed crosswise. In this embodiment, the first lane guide rail is provided with clearance grooves 7.

[0028] Furthermore, lifting plates 1 are slidably connected between the mounting columns 2 on both sides of the main tunnel travel guide rail, forming two sets of lifting units.

[0029] Furthermore, the lifting plate 1 includes a plate body and two slide rails; the two slide rails are installed parallel to each other on the mounting column 2. In this embodiment, the column 2 is provided with a sliding groove, and two rows of bearings are installed in the sliding groove as sliding components for the slide rails to slide; the plate body is fixedly connected to the two slide rails through the bottom two sides respectively, and is slidably installed on the mounting column; one end of each of the two slide rails is hinged to a first connecting rod 13, and the mounting column where the slide rails are located is hinged to a second connecting rod 14 respectively.

[0030] Furthermore, the power unit includes a drive motor 8, a transmission chain 9, a drive gear, a synchronous chain 10, and two drive assemblies; the two drive assemblies are connected to two sets of lifting units one-to-one; the drive assembly includes a rotating shaft 11, two third connecting rods 15, and two fourth connecting rods 16; a rotating shaft 11 is rotatably connected between the two mounting columns of each lifting unit; a transmission gear is fixedly mounted on one end of the rotating shaft 11; the two rotating shafts of the two drive assemblies are synchronously connected by the synchronous chain 10 sleeved on the outside of the transmission gears of the two rotating shafts; third connecting rods 15 are fixedly mounted on both sides of the rotating shaft 11 respectively; a fourth connecting rod 16 is rotatably connected to the end of the third connecting rod 15 away from the rotating shaft; the end of the fourth connecting rod 16 away from the third connecting rod is rotatably connected to the drive end 19; the first connecting rod, the second connecting rod, the third connecting rod, and the fourth connecting rod constitute a crank-rocker connection structure; one of the two rotating shafts 11 is connected to a drive gear at the end away from the transmission gear, and the drive gear is connected to the power end of the drive motor 8 through the transmission chain 9.

[0031] Furthermore, the hinge point between the first link 13 and the slide rail is defined as the first hinge point 17; the hinge point between the second link 14 and the mounting column is defined as the second hinge point 18, and the line connecting the first hinge point 17 and the second hinge point 18 is perpendicular to the connecting beam.

[0032] Furthermore, the four-way vehicle's travel guide rail is provided with a lifting plate receiving groove at the corresponding position of the lifting plate; when the lifting plate slides along the mounting column to the lifting plate receiving groove, the height of the lifting plate surface is adapted to the height of the four-way vehicle's travel guide rail.

[0033] Furthermore, the mounting column is provided with several photoelectric sensors along the radial direction; a light-shielding plate is provided on the lifting plate; there are two photoelectric sensors; the two photoelectric sensors are defined as a low-position photoelectric sensor and a high-position photoelectric sensor along the radial direction; the installation position of the low-position photoelectric sensor is consistent with the position of the receiving slot of the lifting plate; the drive end is driven by the power of the power device, and when the three points of the drive end 19, the first hinge point 17 and the second hinge point 18 are in a straight line, the position of the lifting plate 1 is the installation position of the high-position photoelectric sensor.

[0034] Furthermore, at least one of the two connecting beams is rotatably connected to a baffle; one end of the baffle is rotatably connected to the connecting beam, forming a connecting end; its free end rotates along the rotational connection point, forming a blocking end; the connecting end of the baffle is installed within the movement trajectory of the third link; driven by the drive motor, the third link rotates about the rotating shaft as its rotation axis towards the baffle, and when the third link reaches the baffle, it abuts against the connecting end of the baffle, causing its free end to rise upwards along the rotational connection point; driven by the drive motor, the third link rotates about the rotating shaft as its rotation axis away from the baffle, and after the third link separates from the baffle, the free end of the baffle falls down along the rotational connection point under the action of gravity. In this embodiment, one of the connecting beams is equipped with a baffle.

[0035] Working Principle: 1. Before using the loading and unloading elevator at the main tunnel entrance in this embodiment, the operator first adjusts the positions of the two photoelectric sensors according to the position of the lifting plate receiving slot, the specifications of the four-way vehicle, and the loading and unloading requirements. The installation position of the lower photoelectric sensor is adjusted to be the same as the position of the lifting plate receiving slot. Then, based on the fact that the first connecting rod moves in the opposite direction relative to the second connecting rod along the drive end until the drive end, the first hinge point, and the second hinge point are in a straight line, the position of the lifting plate is used as the installation position of the higher photoelectric sensor. This completes the component installation and debugging process before use.

[0036] 2. During cargo loading, in this embodiment, the two lifting platforms of the main aisle loading and unloading elevator are used. The four-way vehicle moves along the travel guide rail to the stopping position. The pallet loaded with goods is transferred to the side of the stopping position by the forklift. Then, the forks of the forklift extend and transfer the loaded pallet to the stopping position. Next, the lower lifting platform rises along the mounting column. When it reaches the higher position, the forklift places the loaded pallet on the lifting platform. Then, the forks of the forklift retract, and the loaded pallet is supported by the lifting platform. Finally, both lifting platforms descend to the lower position simultaneously. During the descent, the loaded pallet is placed on the four-way vehicle. Finally, the four-way vehicle carries the loaded pallet away along the travel guide rail. It should be noted that when one four-way vehicle enters the stopping position along the travel guide rail, the elevator rises, causing the baffle to rise, which can prevent subsequent four-way vehicles from entering the stopping position, avoiding collisions that could cause the four-way vehicle to fall off the travel guide rail or the goods to fall. Once loading is complete, the lowering of the lifting platform causes the baffle to descend, opening the travel aisle and allowing the vehicle to move freely in all four directions.

[0037] 3. The workflow for unloading goods is the reverse of the loading process, and will not be repeated here. Briefly, the four-way tractor, carrying a pallet, first enters the stopping station along the guide rail. During this process, both lifting platforms are at their low positions. Once the four-way tractor reaches the stopping station, the two lifting platforms rise, lifting the pallet to its high position, separating the pallet from the four-way tractor. The four-way tractor then leaves along the guide rail. Next, the forks of the forklift extend, and both lifting platforms simultaneously descend to their low positions. During this descent, the pallet is placed on the forks of the forklift. Finally, the forklift moves the pallet to the unloading station for unloading. The four-way tractor's loading and unloading process is then directly transferred to the subsequent unloading steps via the lifting platform.

[0038] The embodiments of this application have been described in detail above. However, this application is not limited to the above embodiments. For those skilled in the art, after learning the contents recorded in this application, several equivalent changes and substitutions can be made without departing from the principle of this application. These equivalent changes and substitutions should also be considered to fall within the protection scope of this application.

Claims

1. A main roadway portal loading and unloading elevator, comprising two groups of mounting column assemblies, a lifting plate and a power device; characterized in that: Two groups of the mounting column assemblies are arranged in parallel relative to the walking guide rails of the four-way vehicle, and a four-way vehicle stopping station is formed between the two groups of mounting column assemblies; each group of the mounting column assemblies comprises two mounting columns, and the two groups of mounting column assemblies form four mounting columns; a lifting plate is slidingly connected between the two mounting columns of each group of the mounting column assemblies or the two mounting columns on the same side of the two groups of mounting column assemblies, forming two lifting units; a first connecting rod is rotatably connected to one end of the lifting plate, and a second connecting rod is rotatably connected to the mounting column; the free ends of the first connecting rod and the second connecting rod are rotatably connected to each other as a whole, forming a driving end; the lifting plate is connected to a power end of a power device through the driving end, and under the power driving, the first connecting rod and the second connecting rod move towards or away from each other with the driving end as the rotation point, thereby driving the lifting plate to move up and down along the mounting column; The bottom of the two mounting columns of each group of the mounting column assemblies is connected with a first connecting plate, forming two connecting vertical beams; the two mounting columns on the same side of the two groups of mounting column assemblies are connected with a second connecting plate, forming two connecting horizontal beams; the two connecting vertical beams and the two connecting horizontal beams form a support frame of the mounting column assembly; The lifting plate comprises a plate body and two sliding rails; the two sliding rails are arranged in parallel relative to the mounting column; the plate body is fixedly connected to the two sliding rails on both sides of the bottom and slidingly mounted on the mounting column; one end of each of the two sliding rails is hingedly connected with the first connecting rod, and the mounting column where the sliding rail is located is hingedly connected with the second connecting rod; The power device comprises a driving motor, a transmission chain, a driving gear, a synchronous chain, and two driving assemblies; the two driving assemblies are connected one-to-one with the two groups of lifting units; the driving assembly comprises a rotating shaft, two third connecting rods, and two fourth connecting rods; the rotating shaft is rotatably connected between the two mounting columns of each group of the lifting units; a transmission gear is fixedly installed at one end of the rotating shaft; the two rotating shafts of the two driving assemblies are synchronously connected by being sleeved with the transmission gears outside the two rotating shafts through the synchronous chain; the third connecting rod is fixedly installed on both sides of the rotating shaft; the fourth connecting rod is rotatably connected to one end of the third connecting rod away from the rotating shaft; the fourth connecting rod is rotatably connected to the driving end at one end away from the third connecting rod; the first connecting rod, the second connecting rod, the third connecting rod, and the fourth connecting rod form a crank rocker connecting structure; one of the two rotating shafts is connected with the driving gear at one end away from the transmission gear, and the driving gear is connected with the power end of the driving motor through the transmission chain. At least one of the two connecting cross beams is rotatably connected with a baffle; the baffle end is rotatably connected with the connecting cross beam to form a connecting end; the free end of the baffle rotates along the rotatable connecting point to form a blocking end; the connecting end of the baffle is installed in the movement track of the third connecting rod; the third connecting rod rotates around the rotating shaft under the driving of the driving motor, and moves towards the baffle; when the third connecting rod moves to the baffle, the connecting end of the baffle is abutted, and the free end of the baffle is lifted upwards along the rotatable connecting point; the third connecting rod rotates away from the baffle under the driving of the driving motor, and the free end of the baffle falls downwards along the rotatable connecting point under the action of gravity after the third connecting rod is separated from the baffle.

2. A main roadway portal loading and unloading elevator according to claim 1, characterized in that: The walking guide rail of the four-way vehicle comprises two first lane guide rails and two second lane guide rails; the first lane guide rail and the second lane guide rail are arranged perpendicularly to each other to form a main lane walking guide rail and a sub-lane walking guide rail; the two first lane guide rails as the sub-lane walking guide rail are arranged in parallel between the two connecting cross beams; the two second lane guide rails as the main lane walking guide rail are arranged in parallel between the two connecting vertical beams; the first lane guide rail or the second lane guide rail is provided with an avoiding groove for the first lane guide rail and the second lane guide rail to be arranged in cross.

3. A main entry portal loading and unloading elevator according to claim 2, characterized in that: Lifting plates are slidably connected between the mounting columns on both sides of the main lane walking guide rail to form two groups of lifting units.

4. The main roadway portal loading and unloading lift according to claim 1, characterized in that: The hinge point of the first connecting rod and the slide rail is defined as a first hinge point; the hinge point of the second connecting rod and the mounting column is defined as a second hinge point; and the line between the first hinge point and the second hinge point is perpendicular to the connecting cross beam.

5. The main gate loading and unloading elevator according to claim 1, characterized in that: The walking guide rail of the four-way vehicle is provided with a lifting plate accommodating groove corresponding to the lifting plate; when the lifting plate slides along the mounting column to the lifting plate accommodating groove, the height of the plate surface of the lifting plate is adapted to the height of the walking guide rail of the four-way vehicle.

6. A main entry portal loading and unloading elevator according to claim 5, characterized in that: The mounting column is provided with a plurality of sensing photoelectric elements in the radial direction; the lifting plate is provided with a light shield plate; the number of the sensing photoelectric elements is two; the two sensing photoelectric elements are defined as a low-position photoelectric element and a high-position photoelectric element in the radial direction; the installation position of the low-position photoelectric element is consistent with the position of the lifting plate accommodating groove; the driving end is driven by the power device; when the driving end, the first hinge point and the second hinge point are in a straight line, the position of the lifting plate is the installation position of the high-position photoelectric element.

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