Gear locking center pillar lifting mechanism

Abstract

The invention relates to the technical field of airport ground equipment, in particular to a gear locking center pillar lifting mechanism, center pillar mechanical locking 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 therefore more accurate rack position measurement and judgment can be achieved; meanwhile, an accurate position can be easily reached for locking through one-key lifting, in addition, when the middle column descends, the oil cylinder is lifted firstly, the pawls are 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, the situation that the left pawls, the right pawls and racks are staggered in the locking process does not need to be worried, and the locking effect is good. Therefore, the synchronism of the double lifting racks can be improved, and the technical problems that locking and unlocking actions of an existing pawl 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 teeth are staggered easily due to the fact that the locking time of the pawl is not well controlled are solved.

Description

Technical Field

[0001] The invention relates to the technical field of airport ground equipment, and in particular to a gear-locked center column lifting mechanism. Background Art

[0002] Most passenger boarding ladders use telescopic upper and lower ladders. The lifting of the middle column meets the requirements of a wide range of platform receiving heights. The adjustment of the middle column relies on the telescopic lifting cylinder to adjust the angle of the ladder body to achieve the change of platform height and realize the function of docking with the aircraft cabin door.

[0003] The lifting system is equipped with a hydraulic locking function and requires a mechanical locking safety function. In order to prevent dangerous height changes caused by internal leakage of the cylinder, the industry's demand for mechanical locking mostly uses mechanical pawl locking to lock the passenger boarding ladder.

[0004] However, the locking and unlocking action of the pawl locking structure is large, and the risk of collision with the machine is high when operating under the machine. At the same time, the lifting structure of the center column of the heightening ladder mostly adopts a double cylinder and double rack cylinder. Because the locking and unlocking of the pawl requires the bidirectional action of the cylinder and the coordinated action with the mechanical pawl, the pawl locking time is not well controlled and it is easy to cause misalignment of teeth, resulting in unevenness on both sides of the ladder body. Summary of the invention

[0005] The purpose of the present invention is to provide a gear-locked center column lifting mechanism, which solves the technical problems that the existing gear-locked center column lifting mechanism has large locking and unlocking actions, large risks in under-machine operation, and poor control of the pawl locking time, which easily causes misaligned teeth and leads to unevenness on both sides of the ladder body.

[0006] To achieve the above-mentioned purpose, the present invention provides a gear-locked center column lifting mechanism, comprising 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 and 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 overall frame. The left rack cylinder and the right rack cylinder are both composed of a rack and a cylinder sleeve, and the cylinder sleeves are respectively welded and installed on the connecting plates of the left lifting cylinder and the right lifting cylinder. The number of the gear locking assemblies is 2 groups, each group locks one rack respectively, and the encoder height measuring assembly is arranged under the gear locking assembly on one side of the right rack cylinder.

[0007] Wherein, the rod holes of the left lifting oil cylinder and the right lifting oil cylinder are concentric with the rack holes of the left rack cylinder and the right rack cylinder, and are hinged on the rigid structure of the ladder body.

[0008] Wherein, the oil circuits of the left lifting cylinder and the right lifting cylinder are configured with hydraulic locks and synchronous flow collecting valves to achieve hydraulic locking and hydraulic synchronization.

[0009] Among them, the gear locking assembly includes a hydraulic brake and a follower gear, the follower gear is meshed with the rack, the follower gear is limited in the middle of the connecting plate on the upper part of the cylinder sleeve, the hydraulic brake is fixed on the upper connecting plate on the lifting bracket side, and the rotating shaft of the hydraulic brake passes through the follower gear.

[0010] Among them, the gear locking assembly also includes a locking screw sleeve and a self-lubricating bearing. The locking screw sleeve is installed on the other side of the rotating shaft of the hydraulic brake, and the follower gear and the hydraulic brake rotating shaft are tightly assembled together. A rotating sleeve is welded to the connecting plate on the upper part of the cylinder sleeve, and the self-lubricating bearing is arranged in the rotating sleeve.

[0011] Among them, a steering sleeve is arranged on the lower side of the connecting plate of the hydraulic brake, two steering bearings are arranged concentrically in the steering sleeve, the steering shaft passes through the steering bearing, and a height measuring gear is arranged on the side of the steering shaft close to the follower gear. The height measuring gear is located below the follower gear, and the height measuring gear and the follower gear are tightly meshed and rotate with the rotation of the follower gear.

[0012] Among them, an encoder is arranged on the side of the steering sleeve away from the height measuring gear, and the encoder is connected to the steering shaft. The encoder rotates with the steering shaft and feeds back the rotation angle of the height measuring gear, and the telescopic height of the rack is calculated by the controller.

[0013] The present invention provides a gear-locked center column lifting mechanism, in which the mechanical locking of the center column can respond to any position of the center column lifting and lowering, and the encoder adopts an analog distance feedback signal, so as to achieve more accurate measurement and judgment of the rack position. At the same time, it is also possible to easily reach the precise position for locking through one-key lifting. In addition, when the center column is lowered, the oil cylinder is raised first, and then the ratchet is opened and lowered. The action process can be directly lifted and lowered and locked at will. In addition, the present invention does not require complicated ratchet opening and closing actions, and there is no need to worry about the misalignment of the left and right ratchets and racks when locking, so as to improve the synchronization of the double lifting racks, and solves the technical problems that the existing ratchet locking and unlocking actions are large, the operation risk under the machine is large, and at the same time, the ratchet locking time is not well controlled, which is easy to form misalignment, resulting in unevenness on both sides of the ladder body. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0015] Figure 1 It is a schematic diagram of the overall structure of the gear locking center column lifting mechanism according to the first embodiment of the present invention.

[0016] Figure 2 1 is a schematic structural diagram of a gear locking assembly according to a first embodiment of the present invention.

[0017] Figure 3 It is a schematic diagram of the connection between the follower gear and the height measuring gear in the first embodiment of the present invention.

[0018] In the figure: 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 screw sleeve, 11-self-lubricating bearing, 12-rack, 13-height measuring gear, 14-encoder. DETAILED DESCRIPTION

[0019] 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 are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0020] First embodiment:

[0021] See also Figures 1 to 3 The present invention 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, wherein the gear locking assembly 3 includes a hydraulic brake 8, a follower gear 9, a locking screw sleeve 10 and a self-lubricating bearing 11.

[0022] In this embodiment, the mechanical lock of the center column in the gear-locked center column lifting mechanism adopted by the present invention can respond to any position of the center column lifting and lowering. The encoder 14 uses an analog distance feedback signal to achieve more accurate measurement and judgment of the position of the rack 12. At the same time, it can also easily reach the precise position for locking through one-key lifting. In addition, when the center column descends, the action process of raising the oil cylinder first, waiting for the ratchet to open and then descending can be directly lifted and lowered and locked at will. In addition, the present invention does not require cumbersome ratchet opening and closing actions, and there is no need to worry about the misalignment of the left and right ratchets and racks when locking, thereby improving the synchronization of the double lifting racks, solving the existing problems of large locking and unlocking actions of the ratchet, large risks of operation under the machine, and at the same time, poor control of the ratchet locking time can easily cause misalignment, resulting in uneven technical problems on both sides of the ladder body.

[0023] Among them, 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 overall frame. The left rack cylinder 2 and the right rack cylinder 5 are both composed of a rack 12 and a cylinder sleeve, and the cylinder sleeves are respectively welded and installed on the connecting plates of the left lifting cylinder 1 and the right lifting cylinder 6. The number of the gear locking assemblies 3 is 2 groups, and each group locks one of the racks 12 respectively. The encoder height measuring assembly 7 is arranged 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 oil cylinder 1 and the right lifting oil cylinder 6 are concentric with the rack 12 holes of the left rack cylinder 2 and the right rack cylinder 5, and are hinged on the rigid structure of the ladder body.

[0025] Again, the sleeve holes of the left lifting cylinder 1 and the right lifting cylinder 6 are concentric and hinged on the rigid structure of the chassis, and the overall frame ensures that the left and right sides are concentric and parallel.

[0026] At the same time, the oil circuits of the left lifting cylinder 1 and the right lifting cylinder 6 are configured with hydraulic locks and synchronous flow collecting valves to achieve hydraulic locking and hydraulic synchronization.

[0027] In addition, the follower gear 9 is meshed with the rack 12, and the follower gear 9 is limited in the middle of the connecting plate on the upper part of the cylinder sleeve. The hydraulic brake 8 is fixed at the upper connecting plate on the side of the lifting bracket 4, and the rotating shaft of the hydraulic brake 8 passes through the follower gear 9. The locking screw sleeve 10 is installed on the other side of the rotating shaft of the hydraulic brake 8, and the follower gear 9 and the rotating shaft of the hydraulic brake 8 are tightly assembled together. A rotating sleeve is welded with a rotating sleeve on the connecting plate on the upper part of the cylinder sleeve, and the self-lubricating bearing 11 is arranged in the rotating sleeve. The follower gear 9 locks the rack 12 and follows the rotation during the extension and retraction process of the left lifting cylinder 1 or the right lifting cylinder 6. The self-lubricating bearing 11 supports the follower gear 9 toward one end of 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 following the rotation of 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, and two steering bearings are concentrically arranged in 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 close to the follower gear 9. The height measuring gear 13 is located below the follower gear 9. The height measuring gear 13 is tightly meshed with the follower gear 9 and rotates along 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 telescopic height of the rack 12 is calculated by the controller.

[0030] When using a gear-locked center column lifting mechanism of the present embodiment, when the left lifting cylinder 1 and the right lifting cylinder 6 are lifted or lowered, the rack 12 of the left rack cylinder 2 and the right rack cylinder 5 will extend and retract along with the left lifting cylinder 1 and the right lifting cylinder 6, thereby driving the follower gear 9 and the rotating shaft of the hydraulic brake 8 to follow the rotation. At this time, the hydraulic brake 8 is opened by hydraulic control and is not in a locked state. While the follower gear 9 rotates, the height measuring gear 13 will rotate along with the follower gear 9, thereby driving the steering shaft to rotate along its own axis, and then driving the encoder 14 to rotate along with the steering shaft, and feedback the rotation angle of the height measuring gear 13. The telescopic height of the rack 12 of the left rack cylinder 2 and the right rack cylinder 5 is obtained through conversion by the controller.

[0031] When the left lifting cylinder 1 and the right lifting cylinder 6 stop lifting, the racks 12 of the left rack cylinder 2 and the right rack cylinder 5, the follower gear 9, and the rotating shaft of the hydraulic brake 8 stop moving, and 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 at the same time to ensure the safety of the ladder body. Due to the gear meshing structure, locking at any position can be achieved, and when the ladder body is lowered, there is no need for the cumbersome actions of first raising the ladder, opening the claw, then lowering and closing the claw like the ratchet locking mechanism. At the same time, the angle between the ladder body and the chassis can be adjusted by the telescopic action of the left lifting cylinder 1 and the right lifting cylinder 6, so that the height of the ladder body can be changed to achieve the purpose of adjusting the height of the passenger boarding ladder.

[0032] To sum up, the mechanical lock of the middle column in the gear-locked middle column lifting mechanism adopted in the present invention can respond to any position of the middle column lifting and lowering. The encoder 14 uses an analog distance feedback signal to achieve more accurate measurement and judgment of the position of the rack 12. At the same time, it can also easily reach the precise position for locking through one-key lifting. In addition, when the middle column descends, the action process of raising the oil cylinder first, waiting for the ratchet to open and then descending can be directly lifted and lowered and locked at will. In addition, the present invention does not require cumbersome ratchet opening and closing actions, and there is no need to worry about the misalignment of the left and right ratchets and the rack 12 when locking, thereby improving the synchronization of the double lifting rack 12, solving the existing problems of large locking and unlocking actions of the ratchet, large risks of operation under the machine, and at the same time, poor control of the ratchet locking time is prone to misalignment, resulting in uneven technical problems on both sides of the ladder body.

[0033] What is disclosed above is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A gear-locked center column lifting mechanism, characterized in that: It includes 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 and 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 overall frame. The left rack cylinder and the right rack cylinder are both composed of a rack and a cylinder sleeve, and the cylinder sleeves are respectively welded and mounted on the connecting plates of the left lifting cylinder and the right lifting cylinder. The number of the gear locking assemblies is 2 groups, each group locks one rack respectively, and the encoder height measuring assembly is arranged under the gear locking assembly on one side of the right rack cylinder.

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

3. The gear-locked center column lifting mechanism according to claim 1, characterized in that: The oil circuits of the left lifting cylinder and the right lifting cylinder are provided with hydraulic locks and synchronous flow collecting valves to realize hydraulic locking and hydraulic synchronization.

4. The gear-locked center column lifting mechanism according to claim 1, characterized in that: The gear locking assembly includes a hydraulic brake and a follower gear, the follower gear is meshed with the rack, the follower 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 bracket side, and the rotating shaft of the hydraulic brake passes through the follower gear.

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

6. The gear-locked center column lifting mechanism according to claim 5, characterized in that: A steering sleeve is provided on the lower side of the connecting plate of the hydraulic brake, and two steering bearings are concentrically provided in the steering sleeve. The steering shaft passes through the steering bearings, and a height measuring gear is provided on the side of the steering shaft close to the follower gear. The height measuring gear is located below the follower gear, and the height measuring gear is tightly meshed with the follower gear and rotates with the rotation of the follower gear.

7. The gear-locked 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 to the steering shaft. The encoder rotates with the steering shaft and feeds back the rotation angle of the height measuring gear. The telescopic height of the rack is calculated by a controller.

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