Bidirectional locking device and locking method for a multi-story warehouse lifting platform

Abstract

This invention discloses a bidirectional locking device and a locking method for a multi-level warehouse lifting platform. [Solution] The system includes a three-dimensional shelf, a lifting platform, running rails, and a shuttle car. When the lifting platform is docked, the shuttle car can travel from the shuttle car access rail to the lifting platform and from the lifting platform to the shuttle car access rail. An A mounting beam is provided on the side of the lifting platform that is close to the three-dimensional shelf, and a B mounting beam is provided on the lower part of each shuttle car access rail that is close to the lifting platform. Units A and B are attached to the A mounting beam, and units A and B are attached to the B mounting beam. The A unit on the A mounting beam is fitted into the B unit on the B mounting beam, and the A unit on the B mounting beam is fitted into the B unit on the A mounting beam.

Description

TECHNICAL FIELD

[0001] The present invention belongs to the technical field of intelligent warehouse storage, and more specifically, relates to a two-way stop device for a stereoscopic warehouse lifting platform and a stop method thereof. BACKGROUND ART

[0002] When a conventional stereoscopic warehouse lifting platform docks with a shelf rail, a complex sensor system is always used to realize the fall prevention function of the shuttle car. By arranging a sensor array in the rail docking area, the position of the shuttle car is monitored in real time, and the braking mechanism is triggered by an electric signal. However, sensors are easily interfered by the environment, which causes false triggering or response delay. Especially in high-frequency rail replacement operations, due to the signal transmission delay of the sensor system, the position limiting operation cannot be synchronized with the movement of the shuttle car, failing to meet the real-time performance requirements of high-speed warehouse storage. In addition, when the sensors fail, there is a lack of physical redundant protection. When there is a height difference between the platform and the shelf rail, the sensors cannot form an effective physical barrier, and there is a risk of the shuttle car falling from a high altitude. Moreover, it is necessary to arrange a large number of sensor groups on multi-layer rails, resulting in complicated wiring and high maintenance costs. SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION

[0003] To overcome the drawbacks existing in the prior art, the present invention provides a two-way stop device for a stereoscopic warehouse lifting platform and a stop method thereof, which can automatically release the two-way position limit when the lifting platform is docked with the shelf rail, and automatically form a physical stop in the docked state. At the same time, the shuttle car always maintains one-side protection during the lifting process of the platform, and a two-way interlock mechanism that does not require external power is constructed, so as to solve the problems of response delay and maintenance complexity of conventional devices. MEANS FOR SOLVING THE PROBLEMS

[0004] To achieve the above objective, the bidirectional stopping device for a lifting platform of a multi-story warehouse of the present invention includes a multi-story shelf, a lifting platform, running rails and a shuttle car, the multi-story shelf is provided with multiple sets of shuttle car access rails spaced evenly apart from bottom to top, the lifting platform is capable of moving up and down until it docks with the shuttle car access rails of each level, and in the docked state, the shuttle car can travel from the shuttle car access rail to the lifting platform and from the lifting platform to the shuttle car access rail, an A mounting beam is provided on the side of the lifting platform adjacent to the multi-story shelf, and a B mounting beam is provided on the lower part of each shuttle car access rail adjacent to the lifting platform, an A unit and a B unit are attached to the A mounting beam, an A unit on the A mounting beam is fitted into a B unit on the B mounting beam, and an A unit on the B mounting beam is fitted into a B unit on the A mounting beam. If the A and B units, which are fitted together, are misaligned in height, the A unit on the A mounting beam will prevent the shuttle car from sliding horizontally off the lifting platform, and the A unit on the B mounting beam will prevent the shuttle car from sliding horizontally off the shuttle car access rail. If units A and B, which are mated to each other, overlap in height, unit B is driven to release the function of unit A, which it is mated to, that prevents the shuttle car from sliding.

[0005] Furthermore, unit A includes a fixed base and a vertically asymmetrical rotating body, the fixed base being provided with a bearing, and the rotating body being rotatably fitted to the fixed base via the bearing, with the center of mass located below the bearing, and when units A and B, which are fitted together, are offset in height, the rotating body always maintains a vertically upward orientation.

[0006] Furthermore, the rotating body includes an elongated small end located above the bearing and a wide, low large end located below the bearing. The small end has an oval weight-reducing groove, and a weight block is attached to the large end. The combined action of the weight-reducing groove and the weight block allows the center of mass of the rotating body to be located at the large end below the bearing.

[0007] Furthermore, the lifting platform is equipped with a transition rail that can dock with each shuttle car entry rail, and in the docked state, the running surface of the shuttle car entry rail is coplanar with the running surface of the transition rail.

[0008] Furthermore, if the A and B units, which are fitted together, are offset in height, the rotating body attached to the A mounting beam will have its top end higher than the running surface of the transition rail, and the rotating body attached to the B mounting beam will have its top end higher than the running surface of the shuttle car entry rail.

[0009] Furthermore, Unit B includes a drive block and a mounting base, and a collision block is provided on either the left or right side edge of the large end of the rotating body, and the drive block of the rotary drive assembly is provided corresponding to the collision block and is mounted via the mounting base to the lifting platform or each shuttle car access rail, and in the process of the lifting platform docking with each shuttle car access rail of the tiered shelf via the lifting mechanism, the drive block of the rotary drive assembly comes into contact with the collision block and drives the rotating body of each Unit A to rotate around the bearing until the top end of the rotating body of each Unit A is lower than the running surface of the transition rail or the running surface of the shuttle car access rail.

[0010] Furthermore, magnets are provided on both the fixed base and the rotating body of unit A on the side where they are in close proximity to each other. After the drive block of unit B separates from the collision block of the rotating body, the attractive force between the two magnets can prevent the rotating body from oscillating under inertial action.

[0011] Furthermore, in a method for stopping a bidirectional locking device for a multi-story warehouse lifting platform, In the initial state, the A unit on the B mounting beam is in a vertical position, preventing the shuttle car from falling off the end of the current shuttle car access rail. When the shuttle car needs to enter the upper or lower shuttle car access rail to perform transport operations, the lifting platform is raised or lowered by the lifting mechanism to a position where the shuttle car docks with the shuttle car access rail where it is currently located. In the process of the lifting platform docking with the shuttle car access rail, the two B units are driven to rotate around their respective bearings simultaneously until the tops of both A units are lower than the running surface of the shuttle car access rail and the running surface of the transition rail of the lifting platform in the docked state. This prevents the two A units from stopping the shuttle car from traveling from the current shuttle car access rail to the lifting platform after docking. In the process of the lifting platform driving the shuttle car up or down by the lifting mechanism, the A unit on the A mounting beam is in a vertical position, preventing the shuttle car from falling off the lifting platform. [Effects of the Invention]

[0012] The present invention provides a bidirectional locking device and locking method for a multi-level warehouse lifting platform, which automatically releases bidirectional position restrictions when the lifting platform and shelf rails are docked by a gravity-magnetic combined drive mechanism. It uses an asymmetrical rotating body and a magnetic attraction stabilization structure to automatically form a physical lock in the docked state, and the shuttle car always maintains one-sided protection during the platform's lifting process. It constructs a bidirectional interlock mechanism that does not require external power, and the gravity self-recovery characteristic ensures absolute position restriction in the undocked state. The design of the rotating body's center of mass ensures that the locking part is always held vertically. The drive block collides with the rail during docking to trigger synchronous rotation, achieving seamless connection of the double rails. The magnetic assembly effectively suppresses inertial sway, improving system stability. [Brief explanation of the drawing]

[0013] [Figure 1] This is a schematic diagram of the bidirectional locking mechanism for the elevator platform in its lowered state. [Figure 2] This is a schematic diagram of the bidirectional locking mechanism for the lifting platform in its raised position. [Figure 3] This is a schematic diagram of Unit A. [Figure 4] This is a schematic diagram showing the structural arrangement of Unit A. [Figure 5] This is a schematic diagram of Unit B. [Figure 6] This is a schematic diagram showing the lateral arrangement of Unit A. [Figure 7] This is a schematic diagram showing the case when Unit A and Unit B are fitted together. [Figure 8] This is a schematic diagram of Unit A in the second embodiment. [Figure 9] This is a side view of unit A in the second embodiment. [Figure 10] This is a side view of unit A of the third embodiment. [Modes for carrying out the invention]

[0014] The present invention will be further described below with reference to the drawings.

[0015] As shown in Figures 1-2, the bidirectional stopping device for the lifting platform of the multi-story warehouse includes a multi-story shelf 1, a lifting platform 2, running rails and a shuttle car 6. The multi-story shelf 1 is provided with multiple sets of shuttle car access rails 5 spaced evenly apart from bottom to top. The first layer of shuttle car access rails 5 closest to the ground of the multi-story shelf 1 is designated as the first layer of shuttle car access rails 5.1, the other shuttle car access rails 5 of the multi-story shelf 1 are designated as the second layer of shuttle car access rails 5.2, the third layer of shuttle car access rails 5.3, etc., from bottom to top, up to the first layer of shuttle car access rails 5.n furthest from the ground of the multi-story shelf 1. At the same position on each layer of shuttle car access rails 5 of the multi-story shelf 1, there are vertically overlapping shuttle car lifting areas (not shown), and each of the shuttle car lifting areas is vertically overlapping. A vertical lifting passage (not shown) is formed, and a lifting mechanism (not shown) that can move up and down vertically is provided in the lifting passage. The lifting platform 2 is slidably fitted onto the lifting rail of the lifting mechanism, and a transition rail 26 is provided on the lifting platform 2. In the docking state, the running surface of the transition rail 26 and the running surface of the shuttle car entry rail 5 are on the same horizontal plane. When the lifting platform 2 moves up and down vertically by the lifting mechanism until it docks with any one of the shuttle car entry rails 5 on the three-dimensional shelf 1, the shuttle car 6 can travel from the shuttle car entry rail 5 to the transition rail 26 or from the lifting platform 2 to the shuttle car entry rail 5. The lifting and docking process of the lifting platform 2 is as follows.

[0016] In the initial state, the lifting platform 2 is provided to dock with the first layer shuttle car access rail 5.1, and when the lifting platform 2 is raised from the first layer shuttle car access rail 5.1 to the third layer shuttle car access rail 5.3 by the lifting mechanism, during the rising process, the transition rail 26 of the lifting platform 2 docks with the second layer shuttle car access rail 5.2 and the third layer shuttle car access rail 5.3 in order, and before the lifting platform 2 docks with the third layer shuttle car access rail 5.3, the lifting platform 2 Without reducing the ascent speed, that is, the lifting platform 2 immediately separates after docking with the second layer shuttle car access rail 5.2, and when the lifting platform 2 and the third layer shuttle car access rail 5.3 are docked, the shuttle car 6 on the third layer shuttle car access rail 5.3 can move from the third layer shuttle car access rail 5.3 to the transition rail 26 of the lifting platform 2, or the shuttle car 6 on the lifting platform 2 can move from the transition rail 26 to the third layer shuttle car access rail 5.3. On the side of the lifting platform 2 adjacent to the three-dimensional shelf 1, an A mounting beam 7 is provided, and on the lower part of each shuttle car access rail 5 adjacent to the lifting platform 2, an A unit 3 and a B unit 4 are attached to the A mounting beam 7, and an A unit 3 and a B unit 4 are attached to the B mounting beam 8, and an A unit 3 on the A mounting beam 7 is fitted into a B unit 4 on the B mounting beam 8, and an A unit 3 on the B mounting beam 8 is fitted into a B unit 4 on the A mounting beam 7. When the A unit 3 and B unit 4 that are fitted to each other are displaced in height, the A unit 3 on the A mounting beam 7 has an upper end higher than the lower end of the vehicle body of the shuttle car 6 traveling on the transition rail 26, and prevents the shuttle car 6 from sliding out horizontally from the lifting platform 2; the A unit 3 on the B mounting beam 8 has an upper end higher than the lower end of the vehicle body of the shuttle car 6 traveling on the shuttle car entry rail 5, and prevents the shuttle car 6 from sliding out horizontally from the shuttle car entry rail 5. That is, when the lifting platform 2 moves between the layers of each shuttle car entry rail 5 of the three-dimensional shelf 1 by the lifting mechanism or stops at the non-docking position, the A unit 3 on the B mounting beam 8 obstructs the shuttle car 6 from traveling abnormally on the lifting platform 2 or the shuttle car entry rail 5. That is, when the shuttle car 6 on the shuttle car entry rail 5 of a certain layer needs to move to the shuttle car entry rail 5 of another layer via the lifting platform 2 to operate, before the docking between the lifting platform 2 and the shuttle car entry rail 5 where the shuttle car 6 is located is completed, the A unit 3 on the B mounting beam 8 provided on the shuttle car entry rail 5 where the shuttle car 6 is located obstructs the shuttle car 6 from traveling from the shuttle car entry rail 5 of the corresponding layer to the lifting platform 2 after receiving an erroneous command, so as to prevent the shuttle car 6 from falling from the three-dimensional shelf 1 to the ground upon receiving an erroneous command; the A unit 3 on the A mounting beam 7 can stop the abnormal traveling of the shuttle car 6 on the lifting platform, and prevent the shuttle car 6 from falling from the lifting platform 2 to the ground upon receiving an erroneous command.

[0017] When the A unit 3 and the B unit 4 that are fitted to each other overlap in height, the B unit 4 is driven such that the A unit 3 fitted thereto operates to release the function of preventing the shuttle car 6 from sliding out, that is, when the lifting platform 2 docks with the shuttle car entry rail 5 of any one floor, the A unit 3 is located below the running surface of the shuttle car entry rail 5 and the running surface of the transition rail 26, and the shuttle car 6 can travel from the shuttle car entry rail 5 to the transition rail 26 or can travel from the lifting platform 2 to the shuttle car entry rail 5.

[0018] As shown in FIGS. 3 to 4, the A unit 3 includes a fixed base 9 and a longitudinally asymmetric rotating body 10, the rotating body 10 is rotatably fitted to the fixed base 9 via a bearing 19, the center of mass point is located below the bearing 19, and in a state where no external force is applied, that is, in a non-docking state, the rotating body 10 always maintains a vertically upward orientation. When the A unit 3 and the B unit 4 that are fitted to each other are offset in height, the rotating body 10 always maintains a vertically upward orientation. The A unit 3 on the A mounting beam 7 can stop the shuttle car 6 from traveling from the transition rail 26 of the lifting platform 2 to the shuttle car entry rail 5 after receiving an erroneous command, so as to prevent the shuttle car 6 from falling from the lifting platform 2 to the ground after receiving an erroneous command. The top end of the rotating body 10 of the A unit 3 mounted on the B mounting beam 8 is higher than the running surface of the shuttle car entry rail 5, which obstructs the shuttle car 6 from traveling from the shuttle car entry rail 5 of the corresponding floor to the transition rail 26 of the lifting platform 2 after receiving an erroneous command, so as to prevent the shuttle car 6 from falling from the stereoscopic shelf 1 to the ground after receiving an erroneous command.

[0019] The rotating body 10 includes an elongated small end 13 located above the bearing 19 and a wide, low large end 14 located below the bearing 19. The large end 14 and the small end 13 are integrally connected, and an oval weight reduction groove 15 is formed in the small end 13. A weight block 12 is attached to the large end 14, and through the combined action of the weight reduction groove 15 and the weight block 12, the mass center of the rotating body 10 can be positioned at the large end 14 located below the bearing 19. This ensures that when the rotating body 10 is subjected only by its own gravity, the small end 13 always maintains a vertically upward position, thereby ensuring that when no external force is acting, the upper end of the small end 13 is always higher than the running surface of the shuttle car entry rail 5 and the running surface of the transition rail 26 of the lifting platform 2. This allows the small end 13 of the rotating body 10 to contact the side of the shuttle car 6 so as to be restricted in position when the shuttle car 6 on the shuttle car entry rail 5 or the shuttle car 6 on the lifting platform 2 receives an incorrect command and travels along the running surface of the shuttle car entry rail 5 or the running surface of the transition rail 26, thereby preventing the shuttle car 6 from receiving an incorrect command and falling from the tiered shelf 1 or the lifting platform 2 to the ground.

[0020] The contour of the side of the large end 14 that is separated from the small end 13 is an arc-shaped contour, and by providing it in this way, the influence on the transport of lower cargo in unit A 3 can be effectively reduced.

[0021] As shown in Figure 5, the B unit 4 further includes a drive block 16 and a mounting base 17, and a collision block 11 is provided on either the left or right side edge of the large end 14 of the rotating body 10, and the drive block 16 of the B unit 4 is provided corresponding to the collision block 11 and is attached to the lifting platform 2 or each shuttle car access rail 5 via the mounting base 17, that is, the drive block 16 is attached to the side of the lifting platform 2 that is closer to each shuttle car access rail 5 relative to the collision block 11 via the mounting base 17 or The B units 4 are attached to the collision block 11 via the base 17 on the side of each shuttle car entry rail 5 that is close to the lifting platform 2. In the process of the lifting platform 2 docking with each shuttle car entry rail 5 of the tiered shelf 1 via the lifting mechanism, the drive blocks 16 of the two B units 4 contact the collision block 11 of the A unit 3 which is fitted with them, and drive the rotating body 10 of the A unit 3 to rotate around the bearing 19 until the upper end of the small end 13 of the rotating body 10 of the A unit 3 rotates below the running surface of the shuttle car entry rail 5 and the running surface of the transition rail 26. This prevents the rotating body 10 from obstructing the movement of the shuttle car 6 from the shuttle car entry rail 5 to the transition rail 26 of the lifting platform 2 or from the transition rail 26 of the lifting platform 2 to the shuttle car entry rail 5 after the transition rail 26 of the lifting platform 2 docks with the shuttle car entry rail 5.

[0022] As shown in Figure 6, magnets 18 are provided on both the fixed base 9 and the rotating body 10 of unit A 3 that are close to each other, and after the drive block 16 of unit B 4 separates from the collision block 11 of the rotating body 10, the attractive force between the two magnets 18 can prevent the rotating body 10 from swaying under inertial action.

[0023] In the initial state, the A unit 3 on the A mounting beam 7 is in a vertical position, and the A unit 3 on the B mounting beam 8 is also in a vertical position, and the A unit 3 can prevent the shuttle car 6 from falling from the end of the current shuttle car access rail 5.

[0024] As shown in Figures 1 and 7, in a stopping method for a bidirectional stopper for a lifting platform of a multi-story warehouse, when the shuttle car 6 needs to enter the upper or lower shuttle car access rail 5 to perform transport work, the lifting platform 2 is raised or lowered by the lifting mechanism to a position where the shuttle car 6 is docked with the shuttle car access rail 5 at its current location. During the process of the lifting platform 2 docking with the shuttle car access rail 5, the drive block 16 of the B unit 4 on the B mounting beam 8 collides with the collision block 11 of the A unit 3 on the A mounting beam 7. As a result, the A unit 3 on the A mounting beam 7 rotates around its bearing 19 until its top end is lower than the running surface of the shuttle car entry rail 5 and the lifting surface of the lifting platform 2 in the docked state, and at the same time, the drive block 16 of the B unit 4 on the A mounting beam 7 collides with the collision block 11 of the A unit 3 on the B mounting beam 8, causing the A unit 3 on the B mounting beam 8 to rotate around its bearing 19 until its top end is lower than the running surface of the shuttle car entry rail 5 and the lifting surface of the lifting platform 2 in the docked state. This prevents the shuttle car 6 from stopping from traveling from the current shuttle car access rail 5 to the lifting platform 2 after the A unit 3 on the A mounting beam 7 and the B mounting beam 8 docks. After docking is complete and the contact between the A unit 3 and the B unit 4 is released, the A unit 3 rotates quickly to a vertical position around the bearing 19 due to the action of the magnet 18. In the process of the lifting platform 2 driving the shuttle car 6 up or down by the lifting mechanism, the A unit 3 on the A mounting beam 7 remains in a vertical position, preventing the shuttle car 6 from falling from the lifting platform 2.

[0025] The A unit 3 is further provided with a rotation speed detection device capable of detecting the amount of rotational angle per second relative to the bearing 19 of the rotating body 10 of the A unit 3. If the rotation speed detection device detects that the rotational angle per second relative to the bearing 19 of the rotating body 10 of the A unit 3 is too large, it indicates that the lifting speed of the lifting platform 2 is abnormal and that there is a problem with the lifting mechanism that drives the lifting movement of the lifting platform 2. For example, if the lifting platform 2 is at a high position, it indicates that a malfunction has occurred in the lifting mechanism and the lifting platform 2 has fallen freely. The lifting platform 2 is provided with an alarm device, and the rotation speed detection device is associated with an alarm device signal. If the amount of rotation detected by the rotation speed detection device is greater than a predetermined value, the alarm device is triggered to emit an alarm.

[0026] The above description is a first embodiment of the present solution. In the first embodiment, magnets 18 are provided on both the fixed base 9 and the rotating body 10 of unit A 3 that are close to each other, thereby solving the problem of unit A 3 swinging back under inertial action after the contact between unit A 3 and unit B 4 is released. However, because the cargo stored in the three-dimensional shelf 1 is constantly changing, the presence of the magnets 18 increases the degree of collision between unit A 3 and unit B 4 due to the driving of the lifting platform 2 of unit B 4. As a result, vibration occurs in the cargo on the shuttle car 6 that is transporting the cargo to the lifting platform 2, and this vibration occurs each time the lifting platform 2 rises or falls. If the cargo on the shuttle car 6 is fragile at this time, the vibration can cause damage to the cargo. In response to this problem, a second embodiment of the present solution is presented.

[0027] As shown in Figures 8-9, a rotating shaft 20 is provided vertically on the fixed base 9, and the bearing 19 of the rotating body 10 is slidably fitted onto the rotating shaft 20 coaxially. The rotating body 10 can adjust the interaction force between the two magnets 18 by sliding along the longitudinal direction of the rotating shaft 20 via the bearing 19.

[0028] A sliding adjustment groove is formed in the rotating shaft 20, and a lock bolt 23 is slidably fitted into the sliding adjustment groove. An axial position limiting plate 21 is fitted onto the rotating shaft 20, and the axial position limiting plate 21 is located between the fixed base 9 and the rotating body 10, and contacts the rotating body 10 so that its position limiting surface is always limited to the side of the rotating body 10 that is close to the fixed base 9, and a position limiting bracket 22 is provided on the side away from the rotating body 10, and one end of the lock bolt 23 passes through the sliding adjustment groove and is screwed into the position limiting bracket 22, and a lock nut 24 is screwed onto the screw between the position limiting bracket 22 and the rotating shaft 20 of the lock bolt 23, and by screwing the axial position limiting plate 21 to the rotating shaft 20 by the lock nut 24 and the lock bolt 23, the axial position limiting plate 21 can limit the axial position of the rotating body 10.

[0029] In the second embodiment, the warehouse manager adjusts the position of the lock bolt 23 in the sliding adjustment groove according to the type of goods currently stored in the shelving unit 1, and by changing the distance between the two magnets 18 located on the side where the fixed base 9 and the rotating body 10 of the A unit 3 are close to each other, the objective of adjusting the interaction force between the two magnets 18 can be achieved, thereby reducing the degree of collision between the A unit 3 and the lifting platform 2 of the B unit 4 when driven. Within the adjustable range, the rotating body 10 always tends to move in a direction closer to the fixed base 9 under the action of the interaction force between the two magnets 18.

[0030] The modification in the second embodiment allows the magnitude of the interaction force between the two magnets of unit A 3 to be changed according to the lifting speed corresponding to the type of cargo stored in the shelving unit 1. However, in the second embodiment, the lifting speed of the lifting platform 2 is the same regardless of whether the lifting platform 2 is unloaded, being transported by a shuttle car 6 that is not transporting cargo to the lifting platform 2, or being transported by a shuttle car 6 that is loaded with cargo to the lifting platform 2. Therefore, it is difficult to improve the operational efficiency of the warehouse. Thus, in this solution, a third embodiment is presented.

[0031] A rotating shaft 20 is provided vertically on the fixed base 9, and the bearing 19 of the rotating body 10 is slidably fitted onto the rotating shaft 20 coaxially. The rotating body 10 can adjust the interaction force between the two magnets 18 by sliding along the longitudinal direction of the rotating shaft 20 via the bearing 19.

[0032] As shown in Figure 10, an axial position limiting plate 21 is fitted onto the rotating shaft 20, and the axial position limiting plate 21 is located between the fixed base 9 and the rotating body 10, and contacts the rotating body 10 so that its position limiting surface is always limited to the side of the rotating body 10 that is close to the fixed base 9, and an electric telescopic rod 25 is provided on the fixed base 9 corresponding to the axial position limiting plate 21, and the telescopic end of the electric telescopic rod 25 is fixedly connected to the side of the axial position limiting plate 21 that is away from the rotating body 10.

[0033] Within the extension range of the electric telescopic rod 25, the rotating body 10 always tends to move in a direction closer to the fixed base 9 under the action of the interaction force between the two magnets 18.

[0034] A gravity sensor is provided on the transition rail 26 of the lifting platform 2. The gravity sensor is capable of identifying the load weight on the transition rail 26 and is associated with the signal of the electric telescopic rod 25. It sets no-load data, first gravity data, and second gravity data for three cases: when the lifting platform 2 is unloaded, when a shuttle car 6 without cargo is being transported to the lifting platform 2, and when a shuttle car 6 loaded with cargo is being transported to the lifting platform 2. The third gravity data can be appropriately adjusted according to the type of cargo. If the gravity sensor detects that it has not detected any data after the lifting platform 2 has received a lifting command, it indicates that the lifting platform 2 is unloaded. The system controls the extension end of the electric telescopic rod 25 to extend to its maximum length, and when the gravity sensor detects that it has detected first gravity data, it indicates that a shuttle car 6 without cargo is being transported to the lifting platform 2. The gravity sensor then controls the extension end of the electric telescopic rod 25 to extend to a length where there is almost no collision force between the B unit 4 and the A unit 3 due to the drive of the lifting platform 2. When the gravity sensor detects that it has detected second gravity data, it indicates that a shuttle car 6 loaded with cargo is being transported to the lifting platform 2. The gravity sensor then controls the extension end of the electric telescopic rod 25 to extend to a length where there is almost no collision force between the B unit 4 and the A unit 3 due to the drive of the lifting platform 2.

[0035] The above are preferred embodiments of the present invention, and it is believed that those skilled in the art can make further improvements and modifications without departing from the principles of the present invention, and that these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A bidirectional locking device for a multi-story warehouse lifting platform, It includes a multi-level shelf (1), an elevator platform (2), running rails and shuttle cars (6), Multiple sets of shuttle car access rails (5) are provided on the aforementioned three-dimensional shelf (1) at equal intervals from bottom to top. The lifting platform (2) can be raised and lowered until it docks with the shuttle car access rail (5) on each level. In the docked state, the shuttle car (6) is capable of traveling from the shuttle car access rail (5) to the lifting platform (2), and from the lifting platform (2) to the shuttle car access rail (5). On the side of the lifting platform (2) that is close to the three-dimensional shelf (1), an A mounting beam (7) is provided. A B-mounting beam (8) is provided at the lower part of each shuttle car access rail (5) on the side adjacent to the lifting platform (2). The A mounting beam (7) has the A unit (3) and the B unit (4) attached to it. The A unit (3) and the B unit (4) are attached to the B mounting beam (8). The A unit (3) on the A mounting beam (7) is fitted into the B unit (4) on the B mounting beam (8). The A unit (3) on the B mounting beam (8) is fitted into the B unit (4) on the A mounting beam (7), If the A unit (3) and the B unit (4) that are fitted together are misaligned in height, the A unit (3) on the A mounting beam (7) prevents the shuttle car (6) from sliding horizontally out of the lifting platform (2), and the A unit (3) on the B mounting beam (8) prevents the shuttle car (6) from sliding horizontally out of the shuttle car access rail (5). When the A unit (3) and the B unit (4), which are fitted together, overlap in height, the B unit (4) is driven to release the function of the A unit (3), which is fitted together with it, that prevents the shuttle car (6) from sliding out. The lifting platform (2) is provided with a transition rail (26) that can dock with each of the shuttle car entry rails (5), and in the docked state, the running surface of the shuttle car entry rail (5) and the running surface of the transition rail (26) are on the same horizontal plane. The aforementioned A unit (3) includes a fixed base (9) and a vertically asymmetrical rotating body (10), A bearing (19) is provided on the fixed base (9). The rotating body (10) is rotatably fitted to the fixed base (9) via the bearing (19), and its center of mass is located below the bearing (19), and when the A unit (3) and the B unit (4) that are fitted to each other are offset in height, it always maintains a vertically upward orientation. On the side of the fixed base (9) and the rotating body (10) of unit A (3) that are close to each other, magnets (18) are provided, and after the drive block (16) of unit B (4) separates from the collision block (11) of the rotating body (10), the attractive force between the two magnets (18) can hinder the oscillation of the rotating body (10) under inertial action. A rotating shaft (20) is provided vertically on the fixed base (9). The bearing (19) of the rotating body (10) is slidably fitted onto the rotating shaft (20) along the same axis. The rotating body (10) can adjust the interaction force between the two magnets (18) by sliding along the longitudinal direction of the rotating shaft (20) via the bearing (19). An axial position limiting plate (21) is fitted onto the aforementioned rotating shaft (20). The axial position limiting plate (21) is located between the fixed base (9) and the rotating body (10), and contacts the rotating body (10) such that its position limiting surface is always limited to the side of the rotating body (10) that is close to the fixed base (9). The fixed base (9) is provided with an electrically retractable rod (25) corresponding to the axial position limiting plate (21), The electric telescopic rod (25) is fixedly connected at its telescopic end to the side of the axial position limiting plate (21) that is away from the rotating body (10). A gravity sensor is provided on the transition rail (26) of the lifting platform (2). The gravity sensor is capable of identifying the load weight on the transition rail (26) and is associated with the signal of the electric telescopic rod (25). It sets up no-load data, first gravity data, and second gravity data for three cases: when the lifting platform (2) is unloaded, when a shuttle car (6) without cargo is being transported to the lifting platform (2), and when a shuttle car (6) loaded with cargo is being transported to the lifting platform (2). When any of these data is detected, the electric telescopic rod (25) is controlled to extend to the corresponding length. A bidirectional locking device for a multi-level warehouse lifting platform, characterized by the above features.

2. The rotating body (10) includes an elongated small end (13) located above the bearing (19) and a wide, low large end (14) located below the bearing (19), An oval-shaped weight-reducing groove (15) is formed in the aforementioned small end (13). A weight block (12) is attached to the large end (14). The combined action of the weight reduction groove (15) and the weight block (12) allows the center of mass of the rotating body (10) to be positioned at the large end (14) located below the bearing (19). A bidirectional stopping device for a multi-level warehouse lifting platform according to feature 1.

3. If the A unit (3) and the B unit (4) that are fitted together are misaligned in height, the rotating body (10) attached to the A mounting beam (7) has its top end higher than the running surface of the transition rail (26), and the rotating body (10) attached to the B mounting beam (8) has its top end higher than the running surface of the shuttle car entry rail (5). A bidirectional stopping device for a multi-level warehouse lifting platform according to feature 1.

4. The B unit (4) includes the drive block (16) and the mounting base (17), The collision block (11) is provided on either the left or right side edge of the large end (14) of the rotating body (10). The drive block (16) of the B unit (4) is provided in correspondence with the collision block (11) and is attached to the lifting platform (2) or each of the shuttle car entry rails (5) via the mounting base (17), and in the process of the lifting platform (2) docking with each of the shuttle car entry rails (5) of the three-dimensional shelf (1) via the lifting mechanism, it comes into contact with the collision block (11) and is driven to rotate the rotating body (10) of each A unit (3) around the bearing (19) until the top of the rotating body (10) of each A unit (3) is lower than the running surface of the transition rail (26) or the running surface of the shuttle car entry rail (5). The bidirectional stopping device for a multi-level warehouse lifting platform according to feature 2.

5. A method for stopping a bidirectional stopper for a lifting platform of a multi-story warehouse, as described in claim 1, In the initial state, the A unit (3) on the B mounting beam (8) is in a vertical position, which prevents the shuttle car (6) from falling from the end of the current shuttle car access rail (5). When the shuttle car (6) needs to enter the upper or lower shuttle car access rail (5) to perform transport operations, the lifting platform (2) is raised or lowered by the lifting mechanism to a position where the shuttle car (6) can dock with the shuttle car access rail (5) at its current location. In the process of the lifting platform (2) docking with the shuttle car access rail (5), the tops of the two B units (4) are lower than the running surface of the shuttle car access rail (5) and the running surface of the transition rail (26) of the lifting platform (2) in the docked state. Until the two A units (3) are driven to rotate simultaneously around their respective bearings (19), the two A units (3) are prevented from stopping the shuttle car (6) from traveling from the current shuttle car access rail (5) to the lifting platform (2) after docking, and in the process of the lifting platform (2) driving the shuttle car (6) up or down by the lifting mechanism, the A units (3) on the A mounting beam (7) are in a vertical position, making it possible to prevent the shuttle car (6) from falling from the lifting platform (2). A method characterized by the following:

Images