Gear locking center pillar lifting mechanism

Abstract

The utility model relates to the technical field of airport ground equipment, in particular to a gear locking center pillar lifting mechanism, a center pillar mechanical lock in the gear locking center pillar lifting mechanism can respond to any position along with lifting of a center pillar, analog quantity distance feedback signals are adopted through an encoder, and the gear locking center pillar lifting mechanism is used for locking the center pillar mechanical lock. Therefore, more accurate rack position measurement and judgment can be achieved, meanwhile, an accurate position can be easily reached through one-key lifting for locking, in addition, when the middle column descends, the oil cylinder is lifted firstly, the pawl is opened and then the middle column descends, direct lifting and random locking can be achieved, in addition, tedious pawl unlocking and locking actions are not needed, and the structure is simple and convenient. The situation that the left and right pawls and the racks are staggered in the locking process does not need to be worried any more, so that the synchronism of the double lifting racks can be improved, and the technical problems that locking and unlocking actions of existing pawls are large, the risk of under-machine operation is large, and meanwhile the two sides of a ladder body are uneven due to the fact that the pawls are poor in locking time control and prone to forming staggered teeth are solved.

Description

Technical Field

[0001] This utility model relates to the field of airport ground equipment technology, and in particular to a gear-locking center column lifting mechanism. Background Technology

[0002] Most passenger boarding stairs adopt the telescopic type with upper and lower ladders. The lifting of the central column meets the requirements of a wide range of platform height for aircraft docking. The adjustment of the central column relies on the extension and retraction of the lifting cylinder to adjust the angle of the ladder body, thereby changing the platform height and realizing the docking function of the aircraft cabin door.

[0003] The lifting system is equipped with a hydraulic locking function and also needs to use a mechanical locking safety function. In order to prevent the danger caused by changes in height due to internal leakage of the hydraulic cylinder, the industry mostly uses mechanical pawl locks to lock the passenger boarding stairs.

[0004] However, the locking and unlocking actions of the pawl locking structure are relatively large, and the risk of collision when operating from below is relatively high. At the same time, most of the lifting structures of the central column of the heightening ladder use a combination of double hydraulic cylinders and double rack cylinders. Because the locking and unlocking of the pawl requires the hydraulic cylinder to move in both directions and to cooperate with the mechanical pawl, if the locking time of the pawl is not well controlled, misalignment of the teeth can easily occur, resulting in unevenness on both sides of the ladder. Utility Model Content

[0005] The purpose of this utility model is to provide a gear-locking central column lifting mechanism, which solves the technical problems of existing gear-locking central column lifting mechanisms having large locking and unlocking actions, high risks of operation under the machine, and the pawl locking time being easily misaligned due to poor control, resulting in unevenness on both sides of the ladder body.

[0006] To achieve the above objectives, this utility model provides a gear-locking center column lifting mechanism, including a left lifting cylinder, a left rack cylinder, a gear locking assembly, a lifting bracket, a right rack cylinder, a right lifting cylinder, and an encoder height measuring assembly. The left lifting cylinder, the right lifting cylinder, the left rack cylinder, the right rack cylinder, and the lifting bracket are arranged side by side and tightly connected to form an X-shaped integral frame. The left rack cylinder and the right rack cylinder are both composed of racks and cylinder sleeves. The cylinder sleeves are respectively welded and installed on the connecting plates of the left lifting cylinder and the right lifting cylinder. There are two sets of gear locking assemblies, each set locking one rack. The encoder height measuring assembly is provided below the gear locking assembly on one side of the right rack cylinder.

[0007] The rod holes of the left and right lifting cylinders and the rack holes of the left and right rack cylinders are concentric and hinged to the rigid structure of the ladder body.

[0008] The oil circuits of the left lifting cylinder and the right lifting cylinder are equipped with hydraulic locks and synchronous flow control valves to achieve hydraulic locking and hydraulic synchronization.

[0009] The gear locking assembly includes a hydraulic brake and a follower gear. The follower gear meshes with the rack. The follower gear is constrained in the middle of the connecting plate on the upper part of the cylinder liner. The hydraulic brake is fixed at the upper connecting plate on the side of the lifting bracket. The rotating shaft of the hydraulic brake passes through the follower gear.

[0010] The gear locking assembly further includes a locking sleeve and a self-lubricating bearing. The locking sleeve is installed on the other side of the hydraulic brake shaft, tightly assembling the follower gear and the hydraulic brake shaft together. A rotating sleeve is welded to the connecting plate on the upper part of the cylinder liner, and the self-lubricating bearing is provided inside the rotating sleeve.

[0011] The hydraulic brake has a steering sleeve on the lower side of the connecting plate. Two steering bearings are concentrically arranged inside the steering sleeve. The steering shaft passes through the steering bearings. A height measuring gear is arranged on the side of the steering shaft near the follower gear. The height measuring gear is located below the follower gear. The height measuring gear and the follower gear are tightly meshed and rotate with the rotation of the follower gear.

[0012] An encoder is provided on the side of the steering sleeve away from the height measuring gear. The encoder is connected to the steering shaft, rotates with the steering shaft, and feeds back the rotation angle of the height measuring gear. The controller then calculates the extension height of the rack.

[0013] This utility model discloses a gear-locking center column lifting mechanism. The mechanical locking of the center column in this mechanism can respond to any position during center column lifting and lowering. Through the encoder using analog distance feedback signals, more precise measurement and judgment of the rack position can be achieved. Simultaneously, precise locking can be easily achieved through one-button lifting and lowering. Furthermore, during center column descent, the hydraulic cylinder is raised first, and the pawl opens before lowering, allowing for direct lifting and arbitrary locking. Moreover, this utility model eliminates the cumbersome pawl opening and closing locking actions, and eliminates concerns about misalignment of the left and right pawls and rack when locking, thereby improving the synchronization of the dual lifting racks. It solves the technical problems of existing pawl locking and unlocking actions being too large, posing a high risk of operation under the machine, and the risk of misalignment and unevenness on both sides of the ladder body due to poor control of pawl locking time. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0015] Figure 1 This is a schematic diagram of the overall structure of the gear locking center column lifting mechanism according to the first embodiment of this utility model.

[0016] Figure 2 This is a schematic diagram of the gear locking assembly according to the first embodiment of the present invention.

[0017] Figure 3 This is a schematic diagram of the connection between the follower gear and the height measuring gear in the first embodiment of this utility model.

[0018] In the diagram: 1-Left lifting cylinder, 2-Left rack cylinder, 3-Gear locking assembly, 4-Lifting bracket, 5-Right rack cylinder, 6-Right lifting cylinder, 7-Encoder height measuring assembly, 8-Hydraulic brake, 9-Follower gear, 10-Locking sleeve, 11-Self-lubricating bearing, 12-Rack, 13-Height measuring gear, 14-Encoder. Detailed Implementation

[0019] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0020] First embodiment:

[0021] Please see Figures 1 to 3 This utility model provides a gear-locking center column lifting mechanism, including a left lifting cylinder 1, a left rack cylinder 2, a gear locking assembly 3, a lifting bracket 4, a right rack cylinder 5, a right lifting cylinder 6, and an encoder height measuring assembly 7. The gear locking assembly 3 includes a hydraulic brake 8, a follower gear 9, a locking sleeve 10, and a self-lubricating bearing 11.

[0022] In this embodiment, the mechanical locking of the central column in the gear-locking central column lifting mechanism of this utility model can respond to any position of the central column's rise and fall. Through the encoder 14 using analog distance feedback signals, the position measurement and judgment of the rack 12 can be achieved more accurately. At the same time, the precise position can be easily achieved for locking through one-button lifting. In addition, when the central column is lowered, the hydraulic cylinder is raised first, and the pawl is opened before lowering. The action process can be directly raised and lowered and locked at will. Furthermore, this utility model does not require cumbersome pawl opening and closing locking actions, and there is no need to worry about misalignment of the left and right pawls and rack when locking. This can improve the synchronization of the double lifting racks and solve the technical problems of the existing pawl locking and unlocking actions being large, the risk of operation under the machine being high, and the pawl locking time being easily misaligned, resulting in unevenness on both sides of the ladder.

[0023] The left lifting cylinder 1, the right lifting cylinder 6, the left rack cylinder 2, the right rack cylinder 5, and the lifting bracket 4 are arranged side by side and tightly connected to form an X-shaped integral frame. The left rack cylinder 2 and the right rack cylinder 5 are both composed of racks 12 and cylinder sleeves. The cylinder sleeves are welded and installed on the connecting plates of the left lifting cylinder 1 and the right lifting cylinder 6, respectively. There are two sets of gear locking assemblies 3, each set locking one rack 12. The encoder height measuring assembly 7 is provided under the gear locking assembly 3 on one side of the right rack cylinder 5. The connecting plates of the left lifting cylinder 1, the right lifting cylinder 6, the left rack cylinder 2, the right rack cylinder 5, and the lifting bracket 4 are all tightly connected by bolts.

[0024] Secondly, the rod holes of the left lifting cylinder 1 and the right lifting cylinder 6 are concentric with the rack 12 holes of the left rack cylinder 2 and the right rack cylinder 5, and are hinged to the rigid structure of the ladder body.

[0025] Furthermore, the sleeve holes of the left lifting cylinder 1 and the right lifting cylinder 6 are concentric and hinged to the rigid structure of the chassis, ensuring that the overall frame is concentric and parallel.

[0026] Meanwhile, the oil circuits of the left lifting cylinder 1 and the right lifting cylinder 6 are equipped with hydraulic locks and synchronous flow control valves to achieve hydraulic locking and hydraulic synchronization.

[0027] Additionally, the follower gear 9 meshes with the rack 12. The follower gear 9 is constrained in the middle of the connecting plate on the upper part of the cylinder liner. The hydraulic brake 8 is fixed at the upper connecting plate on the side of the lifting bracket 4. The rotating shaft of the hydraulic brake 8 passes through the follower gear 9. The locking nut 10 is installed on the other side of the rotating shaft of the hydraulic brake 8, tightly assembling the follower gear 9 and the rotating shaft of the hydraulic brake 8 together. A rotating sleeve is welded to the connecting plate on the upper part of the cylinder liner. The self-lubricating bearing 11 is provided inside the rotating sleeve. The follower gear 9 locks the rack 12 and rotates along with it during the extension and retraction of the left lifting cylinder 1 or the right lifting cylinder 6. The self-lubricating bearing 11 supports one end of the follower gear 9 facing the left lifting cylinder 1 and the right lifting cylinder 6, and ensures that the rotating shaft of the hydraulic brake 8 rotates flexibly in the rotating sleeve of the connecting plate when it rotates along with the follower gear 9.

[0028] In addition, a steering sleeve is provided on the lower side of the connecting plate of the hydraulic brake 8. Two steering bearings are concentrically arranged inside the steering sleeve. The steering shaft passes through the steering bearings. A height measuring gear 13 is provided on the side of the steering shaft near the follower gear 9. The height measuring gear 13 is located below the follower gear 9. The height measuring gear 13 and the follower gear 9 are tightly meshed and rotate with the rotation of the follower gear 9.

[0029] Finally, an encoder 14 is provided on the side of the steering sleeve away from the height measuring gear 13. The encoder 14 is connected to the steering shaft. The encoder 14 rotates with the steering shaft and feeds back the rotation angle of the height measuring gear 13. The controller calculates the extension height of the rack 12.

[0030] When using the gear-locking center column lifting mechanism of this embodiment, when the left lifting cylinder 1 and the right lifting cylinder 6 are lifting, the racks 12 of the left rack cylinder 2 and the right rack cylinder 5 will extend and retract together with the left lifting cylinder 1 and the right lifting cylinder 6, thereby driving the rotating shaft of the follower gear 9 and the hydraulic brake 8 to rotate. At this time, the hydraulic brake 8 is opened by hydraulic control and is not in a locked state. At the same time as the follower gear 9 rotates, the height measuring gear 13 will rotate together with the follower gear 9, thereby driving the steering shaft to rotate along its own axis, and then driving the encoder 14 to rotate with the steering shaft and feeding back the rotation angle of the height measuring gear 13. The controller calculates the extension and retraction height of the racks 12 of the left rack cylinder 2 and the right rack cylinder 5.

[0031] When the left lifting cylinder 1 and the right lifting cylinder 6 stop lifting, the rack 12, the follower gear 9, and the rotating shaft of the hydraulic brake 8 of the left rack cylinder 2 and the right rack cylinder 5 stop moving. The hydraulic brake 8 is closed by hydraulic control and is in a locked state. The gear mechanical locking assembly, the hydraulic locking of the left lifting cylinder 1 and the right lifting cylinder 6 are locked simultaneously to ensure the safety of the ladder body. Due to the gear meshing structure, locking at any position can be achieved. When the ladder body descends, there is no need for the cumbersome action of first raising the ladder, opening the pawl, then lowering and then closing the pawl, as is the case with the pawl locking mechanism. At the same time, the angle between the ladder body and the chassis can be adjusted by the extension and retraction of the left lifting cylinder 1 and the right lifting cylinder 6, thereby realizing the change of the ladder body height to achieve the purpose of adjusting the height of the passenger boarding ladder.

[0032] In summary, the mechanical locking of the central column in the gear-locking central column lifting mechanism of this utility model can respond to any position of the central column's rise and fall. The encoder 14 uses analog distance feedback signals to achieve more precise measurement and judgment of the rack 12's position. Simultaneously, precise locking can be easily achieved through one-button lifting. Furthermore, the process of raising the hydraulic cylinder first and then lowering after the pawl opens during central column descent allows for direct lifting and arbitrary locking. Moreover, this utility model eliminates the need for cumbersome pawl opening and closing actions, and avoids concerns about misalignment of the left and right pawls and rack 12 when locking, thus improving the synchronization of the double lifting racks 12. It solves the technical problems of existing pawl locking and unlocking actions being too large, posing a high risk of operation under the machine, and the risk of misalignment due to poor pawl locking time control, leading to unevenness on both sides of the ladder.

[0033] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A gear locking center column lifting mechanism, characterized in that: comprising a left lifting oil cylinder, a left rack cylinder, a gear locking assembly, a lifting support, a right rack cylinder, a right lifting oil cylinder and an encoder height measuring assembly, the left lifting oil cylinder, the right lifting oil cylinder and the left rack cylinder, the right rack cylinder and the lifting support are arranged side by side and closely connected to form an X-shaped overall frame, the left rack cylinder and the right rack cylinder are both composed of a rack and a cylinder sleeve, the cylinder sleeve is respectively welded and installed on the connecting plate of the left lifting oil cylinder and the right lifting oil cylinder, the number of the gear locking assembly is 2 groups, each group locks one rack respectively, the encoder height measuring assembly is arranged below the gear locking assembly on one side of the right rack cylinder.

2. The gear locking center column lifting mechanism according to claim 1, characterized in that: the rod hole of the left lifting oil cylinder and the right lifting oil cylinder and the rack hole of the left rack cylinder and the right rack cylinder are concentric and hinged on the ladder body rigid structure.

3. The gear locking center column lifting mechanism according to claim 1, characterized in that: the oil circuit of the left lifting oil cylinder and the right lifting oil cylinder is provided with a hydraulic lock and a synchronous collecting valve to realize hydraulic locking and hydraulic synchronization.

4. The gear locking center column lifting mechanism according to claim 1, characterized in that: the gear locking assembly comprises a hydraulic brake and a follow-up gear, the follow-up gear is engaged with the rack, the follow-up gear is limited in the middle of the connecting plate on the upper part of the cylinder sleeve, the hydraulic brake is fixed at the upper connecting plate on the lifting support side, and the rotating shaft of the hydraulic brake penetrates through the follow-up gear.

5. The gear locking center column lifting mechanism according to claim 4, characterized in that: the gear locking assembly further comprises a locking sleeve and a self-lubricating bearing, the locking sleeve is installed on the other side of the rotating shaft of the hydraulic brake, the follow-up gear and the rotating shaft of the hydraulic brake are tightly assembled together, and the connecting plate on the upper part of the cylinder sleeve is welded with a rotating sleeve, and the self-lubricating bearing is arranged in the rotating sleeve.

6. The gear locking center column lifting mechanism according to claim 5, characterized in that: a steering sleeve is arranged on the lower side of the connecting plate of the hydraulic brake, two steering bearings are concentrically arranged in the steering sleeve, a steering shaft penetrates through the steering bearings, a height measuring gear is arranged on the side of the steering shaft close to the follow-up gear, the height measuring gear is below the follow-up gear, the height measuring gear and the follow-up gear are tightly engaged and rotate following the rotation of the follow-up gear.

7. The gear locking center column lifting mechanism according to claim 6, characterized in that: an encoder is arranged on the side of the steering sleeve away from the height measuring gear, the encoder is connected with the steering shaft, the encoder rotates following the steering shaft and feeds back the rotation angle of the height measuring gear, and the extension height of the rack is obtained by conversion through the controller. ​ ​ ​ ​ ​ ​ ​

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