Synchronous lifting mechanism

Abstract

The utility model provides a kind of synchronous lifting mechanism, it is related to high-altitude operation machinery field.The utility model synchronous lifting mechanism includes: installation bottom plate, driving mechanism and executing mechanism.Driving mechanism is set to installation bottom plate lower surface, including drive control box, servo motor, speed reducer, multiple pairs of transmission screw rod and commutator;Executing mechanism is set to installation bottom plate upper surface, including four groups of shear type support arm.Transmission screw rod is cross symmetric arrangement, servo motor drives main transmission screw rod by speed reducer, then power is dispersed to vice transmission screw rod by commutator, realizes synchronous transmission.Executing mechanism is connected top platform by shear type support arm, realizes linear lifting under the guidance of sliding guide bush.The utility model lifting mechanism is evenly stressed in lifting process, can prevent support arm to occur inclination, sway, reduce additional internal stress due to partial load.

Description

Technical Field

[0001] This utility model relates to the field of aerial work machinery, specifically to a synchronous lifting mechanism, and more particularly to a highly stable synchronous lifting mechanism. Background Technology

[0002] Lifting mechanisms are commonly used for high-altitude operations, such as street light maintenance, tree trimming, low-altitude maintenance, installation, and cleaning. They are integral to people's lives, and with increasingly stringent safety requirements, improving overall stability is of great significance.

[0003] Scissor lifts consist of multiple sections of boom connected by hinges, allowing them to fold like a fan. They are known for their compact structure, high lifting capacity, and small footprint. However, traditional scissor lifts have some inherent stability defects, such as: poor resistance to eccentric loads: when the load center of gravity deviates significantly from the geometric center of the lifting platform, uneven stress occurs on both sides of the scissor arms, accelerating structural wear and increasing the risk of tipping over. Dependence on ground flatness: when the lifting height reaches its maximum stroke, the effects of uneven ground are amplified. Due to the relatively large clearances in traditional scissor lift platforms, one-sided stress is common, causing the lift to bend and potentially tipping over in severe cases.

[0004] In existing technologies, traditional scissor lift mechanisms are mostly parallel double-arm structures (such as...). Figure 5 As shown in the figure, this structure is driven by hydraulic, electric, pneumatic and other means. It is more suitable when the lifting height requirement is not high. When the lifting stroke is close to the limit, the fulcrum is offset from the geometric center of the lifting mechanism by a lot. At this time, the torque on the fulcrum is several times that in the initial stage of lifting, and the stress situation is very bad. At the same time, the stability in the direction of the vertical arm is poor.

[0005] In special cases, a symmetrical four-arm scissor lift mechanism (such as...) may be used. Figure 6 As shown in the figure, by controlling the power output at both ends simultaneously, the load will not cause uneven force on the fulcrum during the lifting process, and the stability is significantly improved. However, the synchronization requirement of the control is high. If a fault occurs on one side, the probability of causing an accident is extremely high. At the same time, the stability in the direction of the vertical arm is also poor.

[0006] Currently, the relevant existing technologies include: A Chinese patent application with publication number CN106219443A discloses a scissor lift, comprising: a base, a worktable, two parallel and symmetrical scissor supports installed between the base and the worktable, a hydraulic cylinder mounted on the base, and a piston rod connected to the hydraulic cylinder; a connecting column extending horizontally outward from point E, the connecting column being inserted into a through track groove; the track groove being parallel to the movement trajectory at point E on the lift; one end of a traction rope being fixed to the extended end of the piston rod, the other end extending and sequentially engaging with a first fixed pulley and a second fixed pulley, and finally being fixed to the connecting column; this lift has both a high starting lifting speed and a good assist effect; however, due to the concentrated lifting mechanism, there is eccentric stress, which affects the use of the equipment.

[0007] Therefore, the existing technology has the defect of uneven force distribution on the lifting device, which needs to be improved. Utility Model Content

[0008] In view of the deficiencies in the existing technology, the purpose of this utility model is to provide a synchronous lifting mechanism.

[0009] The synchronous lifting mechanism provided by this utility model includes: a mounting base plate, a drive mechanism, and an actuator. The drive mechanism and the actuator are respectively disposed on the lower surface and the upper surface of the mounting base plate; The drive mechanism includes: a servo motor, a reducer, multiple sets of lead screws, and a commutator. A speed reducer and a servo motor are provided on the lower surface of the mounting base plate; There are four sets of transmission lead screws, which are arranged in a cross-shaped symmetrical distribution on the mounting base plate. The speed reducer is connected to the servo motor for transmission; One end of one set of the transmission screws is connected to the reducer for transmission; The commutator is located at the center of the mounting base plate and is connected to the transmission lead screw respectively; The actuator includes: four sets of scissor arms, a top platform, and a sliding guide sleeve; The four sets of scissor arms are arranged in a cross-shaped symmetrical arrangement on the upper surface of the mounting base plate, and their installation positions correspond to the four sets of transmission screws on the lower surface of the mounting base plate. The first end of each scissor arm is connected to the top platform. The end of the scissor arm is provided with two sets of hinges. One set of hinges is hinged to the mounting base plate; the other set of hinges is slidably disposed in the sliding guide sleeve. The hinges located in the sliding guide sleeve are driven to slide linearly in the sliding guide sleeve by the transmission screw.

[0010] Preferably, the transmission lead screw includes: a main transmission lead screw connected to the servo motor and three remaining sets of auxiliary transmission lead screws; The mounting base plate is square; The speed reducer and servo motor are located at one corner of the mounting base plate; One end of each of the three sets of auxiliary transmission lead screws is connected to the commutator, and the other end is respectively distributed at different apex corners of the mounting base plate where no servo motor is installed; no servo motor is installed at the apex corner. The servo motor transmits power to the main drive screw through a two-stage reduction structure. The main drive screw then distributes the power to the other three auxiliary drive screws through a commutator.

[0011] Preferably, each set of transmission lead screws is provided with a set of angular contact bearings and a set of thrust roller bearings at both ends.

[0012] Preferably, the transmission screw adopts a rotary transmission method with a combination of positive and negative threads.

[0013] Preferably, the transmission lead screw is equipped with self-locking and the servo motor brake is equipped with self-locking.

[0014] Preferably, the commutator is a commutator gear, and the commutator gear is a helical gear.

[0015] Preferably, the drive mechanism further includes: a drive control box. The drive control box is mounted on the mounting base plate, and is installed to avoid the movement space of the transmission screw. The drive control box is equipped with a drive module, the drive control box body is equipped with a cover plate, and the outer wall of the drive control box is also equipped with an aviation plug. The drive control box is electrically connected to the servo motor via the aviation plug.

[0016] Preferably, the top platform is a load-bearing lifting platform; the scissor arm is an extendable inner and outer scissor arm.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. This utility model maintains the uniformity of force during the lifting process by uniformly arranging multiple sets of lead screw drives and outriggers in a cross-shaped symmetrical arrangement, preventing the outriggers from tilting or swaying, and reducing the additional internal stress caused by eccentric loading. 2. This utility model extends the service life of key components such as scissor arms and hinges by reducing off-center load stress; 3. Compared with dual motor or dual hydraulic rod drive, this utility model ensures that even if the load center of gravity shifts significantly, the entire drive mechanism will rotate synchronously, thus guaranteeing a smooth load rise and good equipment motion synchronization. 4. This utility model constructs a multi-level anti-overturning system through the self-locking of the lead screw and the self-locking of the motor brake. Even in the event of a sudden failure, the entire lifting device will remain motionless, significantly reducing the risk of overturning and falling, and improving safety. 5. This utility model is applicable to occasions with large lifting weight, frequent changes in center of gravity, or extremely high safety requirements, such as heavy truck repair, aircraft maintenance, and large equipment manufacturing. It has a wide range of applications. Attached Figure Description

[0018] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the drive mechanism in one embodiment of the present invention; Figure 2 This is a schematic diagram of the drive control box structure in one embodiment of the present invention; Figure 3 This is a schematic diagram of the actuator in one embodiment of the present invention; Figure 4 This is a schematic diagram of the support arm arrangement in one embodiment of the present invention; Figure 5 This is a schematic diagram of an existing parallel double-arm lifting structure. Figure 6 This is a schematic diagram of a symmetrical four-arm scissor lift mechanism in the prior art.

[0019] The diagram shows: Detailed Implementation

[0020] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0021] like Figures 1 to 4 As shown, this utility model embodiment provides a synchronous lifting mechanism, including: a control unit, a mounting base plate, a drive mechanism, and an execution mechanism; The drive mechanism and the actuator are respectively located on the lower and upper surfaces of the mounting base plate; the control unit controls the lifting action of the drive mechanism and the actuator.

[0022] like Figure 1 and Figure 2As shown, the drive mechanism includes: a drive control box 16, a servo motor 14, a reducer 13, multiple sets of transmission lead screws 12, and a commutator 15. The mounting base plate is a square structure; a reducer 13 and a servo motor 14 are installed at one corner of the mounting base plate; there are four sets of transmission screws, which are arranged in a cross-shaped symmetrical distribution on the mounting base plate; one end of one set of transmission screws is connected to the reducer 13 located at one corner of the mounting base plate for transmission, the servo motor 14 is connected to the reducer 13 for transmission, the commutator 15 is located at the center of the mounting base plate and is connected to the transmission screws respectively; the drive control box 16 is located on the mounting base plate, and is set to avoid the movement space of the transmission screws.

[0023] Furthermore, the aforementioned transmission leadscrews include: a main transmission leadscrew 11 connected to the servo motor 14 and three sets of auxiliary transmission leadscrews 12; each of the four sets of transmission leadscrews has one end connected to the commutator 15, and the other ends of the three sets of auxiliary transmission leadscrews 12 are respectively distributed at the top corners of the mounting base where the servo motor 14 is not located; the servo motor 14 transmits power to the main transmission leadscrew 11 through a two-stage reduction structure, and the main transmission leadscrew 11 distributes the power to the other three auxiliary transmission leadscrews 12 through the commutator 15. Furthermore, each set of transmission leadscrews is equipped with a set of angular contact bearings and a set of thrust roller bearings at both ends to ensure thread slippage during transmission. More preferably, to ensure that the transmission leadscrews transmit power as required, a rotary transmission method with a combination of positive and negative threads is adopted.

[0024] Furthermore, the aforementioned servo motor 14 incorporates an absolute encoder, enabling adjustable speed and high control precision. Even further, this invention incorporates a self-locking transmission screw and a self-locking brake on the servo motor 14, constructing a multi-level anti-tipping system. Even in the event of a sudden malfunction, the entire lifting device will remain completely stationary, significantly reducing the risk of tipping over and falling.

[0025] More specifically, the aforementioned commutator 15 can be a commutator gear, which is a helical gear. Since the commutation process is completed through a helical gear, it has extremely high synchronization, ensuring that the lead screw sliders of the surrounding transmission lead screws move the same distance. The aforementioned drive control box 16 contains a drive module, and the drive control box 16 is equipped with a cover plate, such as... Figure 2 As shown, an aviation plug is also provided on the outer wall of the box, and the drive control box 16 is connected to the servo motor 14 and the control unit through the aviation plug.

[0026] like Figure 3 and Figure 4 As shown, the actuator includes: a sliding guide sleeve 21, a scissor arm 22, and a top platform 23. The aforementioned top platform 23 serves as a lifting platform; the scissor arms 22 are extendable inward and outward scissor arms, totaling four sets. The head of each set of scissor arms 22 is connected to the top platform 23, and the ends of the scissor arms 22 are positioned on the upper surface of the mounting base plate and the lower surface of the mounting base plate, corresponding to the four sets of transmission screws, via two sets of hinges. Specifically, one set of hinges at the end of each set of scissor arms 22 is slidably mounted on the sliding guide sleeve 21, moving synchronously under the action of the slider of the transmission screw, while the other set of hinges is mounted on the upper surface of the mounting base plate. The scissor arms 22 obtain power through the transmission screws, and the sliding guide sleeve 21 restricts the movement direction of the ends of the scissor arms 22 through limiting components such as limiting blocks and limiting grooves, ensuring that the movement trajectory is linear. The scissor arms 22 are arranged in a cross-shaped symmetrical pattern, ensuring that the position of the load center of gravity relative to the support center does not change during the lifting process.

[0027] In practical use, the control unit of this utility model specifically includes: control software and a control handle. The control software is customized for the lifting mechanism of this utility model, specifying the lifting, lowering, stopping, and fault handling of the lifting mechanism. The entire control process uses the absolute encoder built into the servo motor 14 to memorize the position of the lifting mechanism, thereby judging the execution status of the command. Soft limits are set near the maximum and minimum positions, which can effectively protect the servo motor 14 and other structures of the mechanism and reduce the occurrence of overload. It can be controlled by connecting to the drive control box 16 through the control handle, or it can be controlled by connecting to a host computer, thus enriching the application scenarios.

[0028] The principle behind this invention is as follows: Addressing the stability and safety requirements of traditional scissor lift mechanisms, this invention simultaneously solves several technical needs, namely: how to improve the stress distribution of the load relative to the platform fulcrum during lifting, increasing the equipment's service life; enhancing the support force of the scissor lift mechanism in all directions; strengthening the synchronous control of the multi-arm structure; and reducing the probability of accidents. Considering the varied application scenarios of lifting mechanisms, the diverse forms of loads, and the highly variable center of gravity of the load, which is difficult for on-site personnel to identify, this invention sets the fulcrum at the four corners of the load platform. Simultaneously, the arms are arranged in a cross pattern, and a servo motor 14 at the bottom simultaneously controls four sets of transmission screws, driving the scissor arms to extend, thereby completing the lifting action.

[0029] In summary, to address the technical problems of insufficient stability, easy overturning, or platform tilting of existing scissor lifts in heavy-load, off-center-load, or mobile applications, this utility model provides a comprehensive solution. By arranging the lifting brackets of the scissor lift in a cross shape and synchronously driving four sets of scissor arms with servo motor 14, the safety and stability of the lifting process are greatly improved. It is particularly suitable for high-standard application scenarios such as short-range lifting of vehicle equipment, vehicle repair, and industrial assembly.

[0030] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A synchronous lifting mechanism, characterized in that, include: Mounting base plate, drive mechanism, and actuator. The drive mechanism and the actuator are respectively disposed on the lower surface and the upper surface of the mounting base plate; The drive mechanism includes: a servo motor (14), a reducer (13), multiple transmission lead screws (12), and a commutator (15). A speed reducer (13) and a servo motor (14) are provided on the lower surface of the mounting base plate. There are four sets of transmission lead screws, which are arranged in a cross-shaped symmetrical distribution on the mounting base plate. The reducer (13) is connected to the servo motor (14) via a transmission. One end of one set of the transmission lead screws is connected to the reducer (13) for transmission; The commutator (15) is located at the center of the mounting base plate and is connected to the transmission screw respectively; The actuator includes: four sets of scissor arms (22), a top platform (23), and a sliding guide sleeve (21); The four sets of scissor arms (22) are arranged in a cross-shaped symmetrical arrangement on the upper surface of the mounting base plate, and their installation positions correspond to the four sets of transmission screws on the lower surface of the mounting base plate. The head end of each scissor arm (22) is connected to the top platform (23). The end of the scissor arm (22) is provided with two sets of hinges, one set of which is hinged to the mounting base plate; the other set of which is slidably disposed in the sliding guide sleeve (21), and the hinge located in the sliding guide sleeve (21) is driven to slide linearly in the sliding guide sleeve (21) by the transmission screw.

2. The synchronous lifting mechanism according to claim 1, characterized in that, The transmission screw includes: a main transmission screw (11) connected to the servo motor (14) and three sets of auxiliary transmission screws (12). The mounting base plate is square; The reducer (13) and servo motor (14) are located at one corner of the mounting base plate; One end of each of the three sets of auxiliary transmission screws (12) is connected to the commutator (15), and the other end is respectively distributed at different apex corners of the mounting base where no servo motor (14) is installed; no servo motor (14) is installed at the apex corner. The servo motor (14) transmits power to the main drive screw (11) through a two-stage reduction structure. The main drive screw (11) then distributes the power to the other three auxiliary drive screws (12) through a commutator (15).

3. The synchronous lifting mechanism according to claim 2, characterized in that, Each set of transmission screws is equipped with a set of angular contact bearings and a set of thrust roller bearings at both ends.

4. The synchronous lifting mechanism according to claim 2, characterized in that, The transmission screw adopts a rotary transmission method with a combination of positive and negative threads.

5. The synchronous lifting mechanism according to claim 2, characterized in that, The transmission screw is self-locking and the servo motor (14) brake is self-locking.

6. The synchronous lifting mechanism according to claim 2, characterized in that, The commutator (15) is a commutator gear, and the commutator gear is a helical gear.

7. The synchronous lifting mechanism according to claim 2, characterized in that, The drive mechanism also includes a drive control box (16). The drive control box (16) is mounted on the mounting base plate, and is set to avoid the movement space of the transmission screw. The drive control box (16) is equipped with a drive module, the drive control box (16) is equipped with a cover plate, and the outer wall of the drive control box (16) is also equipped with an aviation plug. The drive control box (16) is electrically connected to the servo motor (14) via the aviation plug.

8. The synchronous lifting mechanism according to claim 2, characterized in that, The top platform (23) is a lifting platform; The scissor arm (22) is an extension scissor arm that can be extended inward or outward.

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