Drive system for a vertically rising platform door

Abstract

The application relates to the field of platform door driving systems, and discloses a driving system of a vertical lifting platform door, which comprises two door body hanging plates, two counterweights, two differential mechanisms, two synchronous pulley assemblies and a driving assembly; the counterweights and the door body hanging plates correspond to each other and are hung on the two sides of the differential mechanisms; the synchronous pulley assemblies and the chains of the differential mechanisms form a ring-shaped closure, which is used for ensuring the synchronization of the door body hanging plates; the driving assembly drives one of the door body hanging plates; the door body hanging plates are driven by the differential mechanisms to synchronously and non-uniformly move. The driving system of the vertical lifting platform door is high in safety and can drive a heavy door body by using a small motor.

Description

Technical Field

[0001] The present application relates to the field of platform door drive systems, and in particular to a drive system for vertically lifting platform doors. Background Art

[0002] With the continuous development of cities, my country's urban rail transit is moving towards the direction of high traffic and public transportation. The requirements for train running speed are constantly increasing, the driving tracking interval is gradually increased, the minimum departure interval is gradually shortened, and vehicle integration and mixed running become possible. In order to solve the problems of multiple vehicles running together in stations with three networks integration, the train door position is uncertain, and the platform door and train door cannot be aligned.

[0003] To solve the problem of aligning platform doors with train doors at stations integrating subway, high-speed rail, and urban rail networks, where multiple types of trains stop, a platform door drive system that can accommodate multiple trains running together is urgently needed. Summary of the Invention

[0004] The purpose of the present application is to provide a driving system for a vertical lift platform door, which has high safety and can use a small motor to drive a heavy door body.

[0005] The present application discloses a drive system for a vertical lift platform door, comprising:

[0006] Two door hanging plates, two balancing weights, two differential mechanisms, two synchronous pulley assemblies and a set of drive components;

[0007] The balancing weight corresponds to the door hanging plate and is hung on both sides of the differential mechanism;

[0008] The synchronous pulley assembly and the chain of the differential mechanism form an annular seal to ensure the synchronization of the door hanging plate;

[0009] The driving component drives one of the door hanging plates;

[0010] The door hanging plate drives the other door hanging plate to move synchronously and at unequal speeds through the differential mechanism.

[0011] In a preferred embodiment, the two differential mechanisms are both sprocket assemblies, respectively comprising: a first differential sprocket and a second differential sprocket;

[0012] The first differential sprocket and the second differential sprocket are linked via a transmission shaft.

[0013] In a preferred embodiment,

[0014] One end of the door hanging plate is connected to the balance weight through a chain and a safety rope via a differential sprocket, and the other end is connected to the other end of the door body counterweight through a synchronous belt via a synchronous pulley assembly.

[0015] In a preferred embodiment, it further comprises an integrated guide rail (1);

[0016] The integrated guide rails include two door hanging plate guide rails and two door counterweight guide rails, which are respectively applicable to the upper and lower door bodies.

[0017] In a preferred embodiment, the first differential sprocket and the second differential sprocket have different sprocket sizes and different numbers of teeth, so that the upper and lower door bodies move synchronously at different speeds.

[0018] In a preferred example, the differential mechanism further includes two idler wheels symmetrically placed below the differential sprocket.

[0019] In a preferred example, the mass of the door body counterweight is equal to the mass of the combination of the door body and the door body hanging plate.

[0020] In a preferred example, the driving assembly is a ball screw assembly, and the screw nut of the ball screw assembly is connected to the door drive connecting block on the door hanging plate.

[0021] In a preferred example, the driving component is a motor, and the motor is connected to the sprocket driving shaft through a coupling.

[0022] In a preferred example, the differential mechanism is a synchronous pulley assembly.

[0023] This application has the following technical effects:

[0024] 1. To effectively increase the proportion of access passages, accommodate the location requirements of train doors, and accommodate a wider range of vehicle models, the side box dimensions should be as small as possible while still meeting strength requirements. The drive system for vertical platform doors in this application effectively solves the problem of a small motor driving a heavy door, significantly reducing the size of the side box (drive and control components).

[0025] 2. The drive system of the vertical lifting platform door of the present application solves the safety door problem of vertical lifting heavy doors. Because the door body is equipped with a balancing counterweight and combined with a screw drive, the door body can be docked at any position of the lifting stroke. Even if a power failure occurs, the door body will not fall, avoiding damage caused by the falling of the door body of the vertical lifting structure.

[0026] 3. The sprocket chain and the toothed synchronous belt form a closed transmission loop, which effectively prevents the sprocket chain from getting stuck and causing transmission failure.

[0027] 4. Through reasonable internal layout of the door machine side box, the internal space utilization of the side box is improved and the external dimensions of the side box are reduced.

[0028] A large number of technical features are described in the specification of the present application, which are distributed in various technical solutions. If all possible combinations of technical features (i.e. technical solutions) of the present application are listed, the specification will be too long. In order to avoid this problem, each technical feature disclosed in the above summary of the present application, each technical feature disclosed in the following various embodiments and examples, and each technical feature disclosed in the drawings can be freely combined with each other to form various new technical solutions (which should be regarded as having been described in the present specification), unless such combination of technical features is technically infeasible. For example, features A+B+C are disclosed in one example, features A+B+D+E are disclosed in another example, features C and D are equivalent technical means that play the same role and can only be used at the same time, and feature E can be combined with feature C technically. Therefore, the solution of A+B+C+D should not be regarded as having been described because it is technically infeasible, and the solution of A+B+C+E should be regarded as having been described. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a structural schematic diagram of a driving system of a vertical lifting platform door according to the first embodiment of the present application;

[0030] Figure 2 is a structural schematic diagram of an integrated guide rail of a driving system of a vertical lifting platform door according to the first embodiment of the present application;

[0031] Figure 3 is a structural schematic diagram of a sprocket assembly of a driving system of a vertical lifting platform door according to the first embodiment of the present application;

[0032] Figure 4 is a structural schematic diagram of an upper door body assembly of a driving system of a vertical lifting platform door according to the first embodiment of the present application;

[0033] Figure 5 is a structural schematic diagram of a ball screw of a driving system of a vertical lifting platform door according to the first embodiment of the present application;

[0034] BRIEF DESCRIPTION OF DRAWINGS

[0035] 1. ball screw assembly, 2. upper door body counterweight assembly, 3. upper door body hanging plate assembly, 4. lower door body counterweight assembly, 5. sprocket assembly, 6. integrated guide rail, 7. lower door body hanging plate assembly, 8. lower door body synchronous belt, 9. lower door body synchronous belt wheel assembly, 10. lower door body synchronous belt wheel assembly, 11. upper door body synchronous belt wheel assembly, 12. upper door body synchronous belt, 13. configuration stop block, 14. counterweight rubber stop block, 15. door body stop block;

[0036] 21. Lower door hanging plate guide rail, 22. Upper door hanging plate guide rail, 23. Lower door counterweight guide rail, 24. Upper door counterweight guide rail;

[0037] 31. Drive shaft, 32. Mounting plate, 33. First differential sprocket, 34. Second differential sprocket, 35. Idle pulley, 36. Chain, 37. Safety rope;

[0038] 41. Isolation lock, A. Door drive connection block;

[0039] 51. Motor, 52. Screw bearing seat, 53. Ball screw, 54. Screw nut. DETAILED DESCRIPTION

[0040] In the following description, many technical details are provided to help readers better understand this application. However, those skilled in the art will understand that even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in this application can be implemented.

[0041] Description of some concepts:

[0042] The "door counterweight" in this application is the "balancing counterweight".

[0043] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0044] The first embodiment of the present application relates to a drive system for a vertical lift platform door, such as Figure 1 As shown, the drive system of the vertical lift platform door includes:

[0045] Ball screw assembly 1, upper door body hanging plate assembly counterweight assembly 2, upper door body hanging plate assembly 3, lower door body counterweight assembly 4, sprocket assembly 5, integrated guide rail 6, lower door body hanging plate assembly 7, lower door body synchronous belt 8, lower door body synchronous pulley assembly 9, lower door body synchronous pulley assembly 10, upper door body synchronous pulley assembly 11, upper door body synchronous belt 12, configuration stopper 13, counterweight rubber stopper 14, door body stopper 15.

[0046] like Figure 2 As shown, the integrated guide rail includes an upper door panel guide rail, an upper door counterweight guide rail, a lower door panel guide rail, and a lower door counterweight guide rail. The two counterweight guide rails are placed side by side, the two panel guide rails are placed side by side, and the counterweight guide rail is opposite to the panel guide rail.

[0047] The upper and lower door bodies, as well as the guide rails of the door body's counterweight are integrated through a special profile, which can not only improve the strength of the entire structure but also effectively utilize space.

[0048] The upper door body transmission assembly is configured in the guide rail, such as Figure 4 As shown, the upper door body transmission assembly includes a first sprocket assembly, a synchronous pulley assembly, an upper door body counterweight, and an upper door body hanging plate. Figure 1 The upper end is connected by a chain, which passes through a sprocket assembly and meshes with the gear of the first sprocket assembly, driving the gear rotation. The upper door counterweight is connected to the other end of the upper door hanging plate by a synchronous pulley, which passes through the synchronous pulley assembly in opposite directions. The upper door hanging plate is equipped with an isolation lock, and the isolation lock assembly is equipped with a door drive connection block. The ball screw assembly's screw nut connects to the door drive connection block, driving the upper door. A stopper and a counterweight rubber stopper are located below the upper door hanging plate to limit the door's travel. A door stopper is also located below the upper door hanging plate for position control. The door counterweight is equivalent in weight to the door itself and, utilizing the fixed pulley principle, is suspended from the other side of the sprocket via the transmission system's differential sprocket. This significantly reduces the door's driving force, requiring minimal force to drive the door up and down. The sprocket chain and the toothed synchronous belt form a closed transmission loop, effectively preventing sprocket chain jams and transmission failures.

[0049] The lower door drive assembly is similar to the upper door, except that the lower door hanger plate lacks a door drive connection block. Instead, the lower door counterweight and the upper end of the lower door hanger plate are connected by a chain and safety rope. The safety rope does not mesh with the gears of the second differential sprocket, but rather rests solely on them. This prevents the door from separating from the counterweight and causing it to fall if the chain breaks, thus enhancing the overall safety level of the system. Furthermore, the safety rope is fully interlocked within the sprocket-chain transmission structure to prevent the counterweight from accidentally falling. When the upper door is driven, the chain in the upper door drive assembly rotates the gears in the first sprocket assembly, which, through the drive shaft, rotates the second sprocket assembly in the lower door assembly, thereby driving the lower door. The first differential sprocket in the first sprocket assembly and the second differential sprocket in the second sprocket assembly can have different numbers of teeth, allowing the upper and lower doors to move synchronously but at different speeds.

[0050] The two door bodies are respectively equipped with balancing weights through sprocket chains and toothed synchronous belt structures, and the fixed pulley principle is used to reduce the driving torque of the motor, thereby achieving the goal of small motor driving heavy door bodies.

[0051] like Figure 3As shown, the sprocket assembly includes a first differential sprocket, a second differential sprocket, a drive shaft, a mounting plate, and an idler pulley. The drive shaft passes through a mounting hole in the mounting plate, with the first and second differential sprockets mounted on either side of the drive shaft, respectively. The first and second differential sprockets have different numbers of teeth. Two idler pulleys are symmetrically positioned below each differential sprocket, with chains meshing with both the idler pulleys and the differential sprockets. The two doors utilize a sprocket differential mechanism to achieve co-directional motion. When raised (opening) to their full height, they overlap, opening the access channel. When lowered (closing), they fully extend, sealing the access channel.

[0052] like Figure 5 As shown, the ball screw assembly includes a motor, a ball screw bearing, a ball screw, and a ball screw nut. The ball screw nut is threadedly connected to the ball screw. The motor drives the ball screw through the ball screw bearing, causing the ball screw nut to move forward or backward. The ball screw nut connects to the door drive connection block on the upper door panel, driving the upper door in vertical linear motion.

[0053] Optionally, in one embodiment, the ball screw assembly can also be replaced by a synchronous wheel and synchronous belt assembly. As long as the principles are the same, they should be within the scope of protection.

[0054] Optionally, in one embodiment, the sprocket differential mechanism is not limited to sprockets, but also includes gears and synchronous pulley assemblies. As long as the principles are the same, they should all be within the protection scope.

[0055] Alternatively, in one embodiment, the synchronous pulley may be a belt pulley.

[0056] In order to better understand the technical solution of the present application, a specific example is provided below for illustration. The details listed in the example are mainly for ease of understanding and are not intended to limit the scope of protection of the present application.

[0057] The driving system of the vertical lifting platform door of the present application utilizes two sets of door driving systems symmetrically arranged at both ends of the door body, synchronously driving the door body to move linearly in the vertical direction, and is composed of an upper door body hanging plate, a lower door body hanging plate, an upper door body counterweight, a lower door body counterweight, a sprocket assembly, a ball screw transmission assembly, etc.

[0058] The upper door body hanging plate is connected to the door body; the upper door body counterweight, sprocket assembly, and synchronous belt system use the fixed pulley principle to form an equal force balance system (the upper door body transmission assembly, the counterweight mass (one set on the left and right) are equal to the sum of the mass of the upper door body and the upper door body hanging plate), so the door body can be driven with a smaller force.

[0059] The transmission principle of the lower door body (except the screw-nut structure) is the same as the transmission structure of the upper door body.

[0060] The upper door drive assembly and the lower door drive assembly are connected via the sprocket assembly's differential sprocket, forming a linkage relationship and ensuring synchronous, unequal-speed motion. The lower door's rising speed and stroke are determined by the sprocket assembly's differential speed ratio, ensuring that the upper and lower doors overlap when they reach their full height.

[0061] The ball screw assembly is connected to the isolation lock on the upper door panel of the upper door transmission assembly through the screw nut. This allows the ball screw assembly to drive the upper door up and down. The movement of the upper door drives the lower door to move together, forming a synchronous linkage.

[0062] Optionally, the transmission is not limited to the method in which the screw drives the door body and the door body drives the sprocket drive shaft, but also includes other methods of driving the sprocket drive shaft, such as the motor and the sprocket drive shaft are directly connected through a coupling, the motor drives the sprocket drive shaft through a belt, chain drive, etc.

[0063] Optionally, the sprocket assembly is not limited to sprockets, but also includes a transmission structure with the same principle consisting of synchronous pulleys, gears, etc.

[0064] The synchronous belt assembly in the transmission assembly and the sprocket chain in the sprocket assembly form a closed loop to ensure the synchronization between the door body and the door counterweight, and prevent the door body from creeping due to problems with the guide rail, thereby improving the safety level of the entire system.

[0065] The safety rope is used to prevent the door from falling due to the separation of the door and the counterweight in the event of chain breakage, thereby improving the safety level of the entire system.

[0066] The drive system of the vertical lifting platform door of the present application improves the internal space utilization of the side box and reduces the external dimensions of the side box through a reasonable internal layout of the door machine side box.

[0067] It should be noted that in this patent application, relational terms such as first and second, etc., are used solely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, the terms "comprise," "include," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. Without further limitation, an element specified by the phrase "comprising a" does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element. In this patent application, reference to performing an action in accordance with an element means performing the action in accordance with at least that element, including two situations: performing the action in accordance with that element alone, and performing the action in accordance with that element and other elements. Expressions such as "plurality," "multiple times," and "many" include "two," "twice," "two kinds," and "more than two," "more than two times," and "more than two kinds."

[0068] This specification includes combinations of the various embodiments described herein. Separate references to "one embodiment" or a particular embodiment, etc., do not necessarily refer to the same embodiment; however, these embodiments are not mutually exclusive unless indicated as such or clear to one skilled in the art. It should be noted that the word "or" is used in this specification in a non-exclusive sense unless the context clearly indicates or requires otherwise.

[0069] All documents mentioned in this application are considered to be included in their entirety in the disclosure of this application so that they can be used as a basis for modification when necessary. In addition, it should be understood that after reading the above disclosure of this application, those skilled in the art may make various changes or modifications to this application, and these equivalent forms also fall within the scope of protection claimed in this application.

Claims

1. A drive system for a vertical lift platform door, characterized in that: include: Two door hanging plates, two balancing weights, two differential mechanisms, two synchronous pulley assemblies and a set of drive components; The balancing weight corresponds to the door hanging plate and is hung on both sides of the differential mechanism; The synchronous pulley assembly and the chain of the differential mechanism form an annular closure for ensuring the synchronization of the door hanging plate; the two differential mechanisms are both sprocket assemblies, respectively including a first differential sprocket and a second differential sprocket, and the first differential sprocket and the second differential sprocket are linked by a transmission shaft; one end of the door hanging plate is connected to the balancing weight via a chain and a safety rope via the differential sprocket, and the other end is connected to the other end of the balancing weight via the synchronous pulley assembly through a synchronous belt; The driving assembly drives one of the door hanging plates, which drives the other door hanging plate to move synchronously and at unequal speeds through the differential mechanism; The two door hanging plates overlap to open the access passage when they are raised to their proper position, and are fully unfolded to close the access passage when they are lowered to their proper position.

2. The driving system for a vertical lift platform door according to claim 1, wherein: Also included is an integrated guide rail (1); The integrated guide rails include two door hanging plate guide rails and two door counterweight guide rails, which are respectively applicable to the upper and lower door bodies.

3. The driving system for a vertical lift platform door according to claim 2, wherein: The first differential sprocket and the second differential sprocket have different sprocket sizes and different numbers of teeth, so that the upper and lower door bodies move synchronously at different speeds.

4. The driving system for a vertical lift platform door according to claim 1, wherein: The differential mechanism further includes two idler wheels symmetrically placed below the differential sprocket.

5. The driving system for a vertical lift platform door according to claim 1, wherein: The mass of the balancing weight is equal to the mass of the combination of the door body and the door body hanging plate.

6. The driving system for a vertical lift platform door according to claim 1, wherein: The driving assembly is a ball screw assembly, and the screw nut of the ball screw assembly is connected to the door body driving connecting block on the door body hanging plate.

7. The driving system for a vertical lift platform door according to claim 1, wherein: The driving assembly is a motor, and the motor is connected to the sprocket driving shaft through a coupling.

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