A friction drive assembly for a shell plate flexible positioning system

Abstract

The application discloses a friction drive assembly for a shell plate flexible positioning system, comprising a machining platform with a track and a clamping fixing mechanism arranged on the track, the clamping fixing mechanism comprising a fixed part for clamping the shell plate and a telescopic part, the fixed part comprising a driving wheel seat with a rotating shaft arranged perpendicularly to the machining platform, a driving friction wheel arranged on the rotating shaft and having a rolling surface in contact with one side of the shell plate, and a first driving motor for providing driving force for the rotating shaft, and the telescopic part comprising a driven wheel seat with a driven shaft arranged perpendicularly to the machining platform, and a driven friction wheel arranged on the driven shaft and having a rolling surface in contact with the other side of the shell plate. The friction drive assembly provided by the application can be adapted to workpieces with different diameters and provide a circumferential movement function to meet the requirements of different welding processes, so that high-quality welded workpieces are obtained.

Description

Technical Field

[0001] This invention belongs to the technical field of ship processing equipment, and particularly relates to a friction drive component for a flexible positioning system of shell plates. Background Technology

[0002] With the increasing demand for high-performance ships, traditional shipbuilding technologies can no longer meet the requirements for high precision and high efficiency. Therefore, it is necessary to promote the digital construction process of ships and design a digital circumferential assembly system for thick hull plates. The friction drive component described in this article can be used in the digital circumferential assembly system for thick hull plates, driving the hull plate to adjust circumferentially through friction.

[0003] Friction drive components are used to control the circumferential movement of large shell plates in a digital assembly system. Related friction drive components include translational friction drive devices used in item sorting machines and friction drive systems used in automated production lines. Solving the problem of fixing large workpieces is one of the key points for improving processing quality.

[0004] Patent document CN105465317 discloses a translational friction drive device, including a first friction drive mechanism and a second friction drive mechanism symmetrically arranged on a drive frame, wherein the driving force between the first and second friction drive mechanisms drives a transmission drive plate; it also includes an elastic component for elastically bringing the first and second friction drive mechanisms closer together, and a moving component for moving the first and second friction drive mechanisms back and forth on the drive frame, thereby adjusting the driving force when the drive plate swings. However, this device is only suitable for flat surfaces and cannot be used to fix bent or large workpieces.

[0005] Patent document CN115959410A discloses a friction drive device, including a support frame (1), an adjusting base (2), and a drive unit (3). The adjusting base (2) is mounted on the support frame (1), and the drive unit (3) is located on the adjusting base (2). The adjusting base (2) can finely adjust the position of the drive unit (3). The drive unit (3) is used to drive the movement of the logistics sorting equipment. The drive unit (3) includes a side plate assembly (30), a drive motor (31), a reduction gearbox (32), a drive shaft (33), a drive wheel (34), a driven wheel (35), and a limiting guide assembly (36). The side plate assembly (30) is fastened to the adjusting base (2) by fasteners, the reduction gearbox (32) is fastened to the adjusting base (2) by fasteners, and the drive motor (31) is connected to the adjusting base (2) by a motor mount. It is connected to the support frame (1); the output end of the drive motor (31) is located in the gearbox (32), one end of the drive shaft (33) is located in the gearbox (32), and the output end of the drive motor (31) is connected to the end of the drive shaft (33) located in the gearbox (32); the end of the drive shaft (33) away from the gearbox (32) is provided with a drive wheel (34), and a one-way bearing is also provided between the drive shaft (33) and the drive wheel (34). The drive shaft (33) drives the drive wheel (34) to rotate through the one-way bearing; the drive wheel (34) and the driven wheel (35) can press the drive plate together to generate driving force; a driven shaft (37) is fixedly installed below the driven wheel (35), and the driven wheel (35) is connected to the driven shaft (37) through the bearing; the limiting guide assembly (36) is located between the side plate assemblies (30). The active and driven friction wheels are arranged on opposite sides about the longitudinal axis of the friction rod, but this friction drive device is only suitable for guiding the friction rod and cannot drive circular motion. Summary of the Invention

[0006] The purpose of this invention is to provide a friction drive assembly that can adapt to the circumferential movement of workpieces of different diameters, thereby ensuring the quality of welding processing.

[0007] To achieve the objectives of this invention, a friction drive assembly for a shell plate flexible positioning system is provided, comprising a processing platform with a track and a clamping and fixing mechanism disposed on the track. The clamping and fixing mechanism includes a fixing part and a telescopic part for clamping the shell plate. The fixing part includes an active wheel seat with a rotating shaft arranged perpendicular to the processing platform, an active friction wheel disposed on the rotating shaft with its rolling surface in contact with one side of the shell plate, and a first drive motor for providing driving force to the rotating shaft. The clamping and telescopic part includes a driven wheel seat with a driven shaft arranged perpendicular to the processing platform, and a driven friction wheel disposed on the driven shaft with its rolling surface in contact with the other side of the shell plate.

[0008] The present invention sets the clamping and fixing mechanism on the track of the processing platform, and uses a pair of active friction wheels and driven friction wheels with adjustable spacing in the clamping and fixing mechanism to clamp the shell plate to be processed. At the same time, the shell plate is moved circumferentially by the drive motor matched with the active friction wheel, thereby realizing the arc movement of the large shell plate.

[0009] Specifically, the track is provided in multiple ways, and the multiple tracks are laid outward from the center starting point of the processing platform. Each track is equipped with a clamping and fixing mechanism to ensure the stability of the large shell plate during circumferential movement during processing.

[0010] Specifically, the tracks are arranged at equal angles between each pair of adjacent tracks, with the angle ranging from 60° to 120°, to ensure uniform stress on the large shell plates and further improve stability.

[0011] Specifically, a radial preload assembly is provided between the rotating shaft and the output end of the drive motor to provide preload force when clamping the shell plate. When the large shell plate moves circumferentially, its radius may change slightly. The radial preload assembly can achieve radial preload so that the active friction wheel always fits the shell plate.

[0012] Specifically, the radial preloading assembly is fitted with a limiting ring and a sealing shell in sequence along the radial direction of the rotation axis. A preloading gap is left between the circumferential surface of the limiting ring and the inner wall of the sealing shell, and the range of the preloading gap is 2 to 3 mm.

[0013] Specifically, the clamping and fixing mechanism also includes an adjustment component for adjusting the distance between the telescopic part and the fixing part.

[0014] Specifically, the adjustment assembly includes mounting plates respectively disposed on the fixed part and the telescopic part, and a lead screw mechanism passing through the two mounting plates. The lead screw mechanism includes a rotating lead screw passing through the two mounting plates along the line connecting the centers of the driven friction wheel and the driving friction wheel, and a second drive motor providing driving force for the rotation of the rotating lead screw. Based on the rotating lead screw, the adjustment accuracy of the gap can be better controlled to avoid excessive clamping and deformation damage to the shell plate.

[0015] Specifically, the first drive motor includes a reducer and a servo motor connected in sequence to the rotating shaft. The reducer amplifies the output torque of the servo motor, thereby achieving the purpose of circumferential movement of the large housing.

[0016] Specifically, the rolling surface of the active friction wheel is coated with polyurethane to increase friction while preventing damage to the shell plate.

[0017] Specifically, the rolling surface of the driven friction wheel is coated with polyurethane to prevent damage to the shell plate.

[0018] Unlike existing technologies, the beneficial effects of this invention are:

[0019] The shell plate is adjusted circumferentially by friction, and the rollers driven by the motor adaptively fit and press the shell ring radially, and provide radial preload to adapt to the changes in radial position during rotation, so as to meet the needs of different welding processes and thus obtain high-quality welded workpieces. Attached Figure Description

[0020] Figure 1 This is a top view of the friction drive assembly provided in this embodiment;

[0021] Figure 2 This is a schematic diagram of the clamping and fixing mechanism provided in this embodiment;

[0022] Figure 3 This is a cross-sectional view of the clamping and fixing mechanism provided in this embodiment;

[0023] In the diagram, 1 is the clamping and fixing mechanism; 2 is the track; 3 is the shell plate; 11 is the servo motor; 12 is the reducer; 13 is the radial preload assembly; 14 is the upper bearing of the drive wheel; 15 is the rotating shaft; 16 is the drive friction wheel; 17 is the drive wheel seat; 18 is the lower bearing of the drive wheel; 19 is the lead screw mechanism; 110 is the lower bearing of the driven wheel; 111 is the driven shaft; 112 is the driven friction wheel; 113 is the driven wheel seat; and 114 is the upper bearing of the driven wheel. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0025] like Figure 1 The figure shows a top view of the friction drive assembly provided in this embodiment. The processing platform in the figure has three tracks 2, each track 2 equipped with a clamping and fixing mechanism 1. The shell plate 3 to be processed is clamped and fixed by multiple clamping and fixing mechanisms 1 to achieve arc positioning, thereby providing a stable processing environment for subsequent welding and forming. In this embodiment, the included angle between every two tracks is 120°, forming a stable triangle, further improving its stability to handle larger shell plate processing tasks.

[0026] like Figure 2 and3 The diagram shown is a schematic of the clamping and fixing mechanism provided in this embodiment. The clamping and fixing mechanism 1 includes a fixing part and a telescopic part for clamping the shell plate 3. The fixing part includes an active wheel seat 17 with the rotating shaft 15 arranged perpendicularly to the processing platform, an active friction wheel 16 disposed on the rotating shaft 15 and whose rolling surface contacts one side of the shell plate 3, and a servo motor 11 that provides driving force to the rotating shaft 15. The clamping telescopic part includes a driven wheel seat 113 with the driven shaft 111 arranged perpendicularly to the processing platform, and a driven friction wheel 112 disposed on the driven shaft 111 and whose rolling surface contacts the other side of the shell plate 3.

[0027] Among them, a reducer 12 and a radial preload assembly 13 are also provided between the servo motor 11 and the active friction wheel 16. The reducer 12 is used to amplify the output torque of the servo motor 11, so as to meet the torque requirements of the circumferential movement of the large shell plate 3.

[0028] The radial preload assembly 13 is fitted with a limiting ring and a sealing shell in sequence along the radial direction of the rotating shaft 15. A preload gap is left between the circumferential surface of the limiting ring and the inner wall of the sealing shell. In this embodiment, the range of the preload gap is 2 to 3 mm.

[0029] In addition, the clamping and fixing mechanism 1 also includes a lead screw mechanism 19 for adjusting the distance between the telescopic part and the fixed part. The lead screw mechanism 19 includes a rotating lead screw that passes through the two mounting plates along the line connecting the center of the driven friction wheel and the driving friction wheel, and a second drive motor that provides driving force for the rotation of the rotating lead screw. Based on the rotating lead screw, the adjustment accuracy of the gap can be better controlled to avoid deformation damage to the shell plate caused by excessive clamping.

[0030] More specifically, the upper bearing 14 of the drive wheel contacts the rotating shaft 15 and the drive wheel seat 17. A rolling bearing can be selected to reduce the friction and wear between the rotating shaft 15 and the drive wheel seat 17. The lower bearing 18 of the drive wheel can be a tapered roller bearing, which has a higher load-bearing capacity and better self-aligning properties compared to a ball bearing. At the same time, the surface of the spindle of the rotating shaft 15 needs to be rust-proofed.

[0031] The rolling surface of the active friction wheel 16 is coated with polyurethane. The coating hardness of the polyurethane can reach Shore A98 or Shore D55, which increases friction while avoiding damage to the shell.

[0032] The rolling surface of the driven friction wheel 112 is coated with polyurethane, which can achieve a hardness of Shore A98 or Shore D55 to avoid damage to the shell plate.

[0033] The upper bearing 114 of the driven wheel contacts the driven shaft 111 and the driven wheel seat 113. A rolling bearing can be selected to reduce friction and wear between the driven shaft 111 and the driven wheel seat 113. The lower bearing 110 of the driven wheel can be a tapered roller bearing, which has a higher load-bearing capacity and better self-aligning properties compared to ball bearings. Meanwhile, the surface of the spindle of the driven shaft 111 needs to be treated with rust prevention.

[0034] The working principle of the clamping and fixing mechanism is as follows: The distance between the fixed part and the telescopic part is adjusted by the lead screw mechanism to meet the size and thickness of the shell plate to be processed. The position of the active friction wheel and the pre-pressure component is adjusted, and a certain amount of clearance is reserved to deal with the shell plate that may be uneven. The servo motor is started to output torque, and the speed of the motor output is adjusted by the reducer to increase the torque. When the output torque is transmitted to the active wheel shaft to realize rotation, the active wheel shaft is connected to the active friction wheel by a key connection, thereby driving the active friction wheel to rotate. The active friction wheel contacts the shell plate and generates a frictional force that drives the shell plate to move in the circumferential direction. At the same time, the driven friction wheel cooperates with the active friction wheel to move in the circumferential direction to maintain the stability of the shell plate.

[0035] In summary, the mechanism provided in this embodiment drives the shell plate to adjust circumferentially through friction, while the motor drives rollers to adaptively and radially press and tighten the shell ring, providing radial preload to accommodate changes in radial position during rotation. It can be used to drive one-third of the shell plate's circumferential movement, and can be adjusted circumferentially according to different shell plate specifications such as thickness. It can frictionally drive cylindrical shell ring segments with diameters of 5.5-12.5 meters, and shell ring weights of approximately 20-90 tons, ensuring tight pressing of the shell ring during frictional driving while preventing damage to the shell ring.

[0036] Furthermore, the terms "upper," "lower," "inner," "outer," "front," and "rear" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Unless otherwise specifically stated, the relative steps, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0037] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of the present invention. All equivalent changes or modifications made to the structure, features and principles described in the claims of the present invention should be included in the scope of the claims of the present invention.

[0038] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A friction drive assembly for a flexible positioning system of a shell plate, characterized in that, The device includes a processing platform with tracks and a clamping and fixing mechanism mounted on the tracks. Multiple tracks are provided, laid outwards from the center of the processing platform. Each track is equipped with a clamping and fixing mechanism. The clamping and fixing mechanism includes a fixing part and a telescopic part for clamping the shell plate. The fixing part includes a drive wheel seat with a rotating shaft perpendicular to the processing platform, a drive friction wheel mounted on the rotating shaft with its rolling surface contacting one side of the shell plate, and a first drive motor providing driving force to the rotating shaft. The telescopic part includes a driven wheel seat with a driven shaft perpendicular to the processing platform, and a driven friction wheel mounted on the driven shaft with its rolling surface contacting the other side of the shell plate. A radial preload assembly for providing preload force when clamping the shell plate is provided between the rotating shaft and the output end of the first drive motor. The radial preload assembly is fitted with a limiting ring and a sealing shell in sequence along the radial direction of the rotation axis. A preload gap is left between the circumferential surface of the limiting ring and the inner wall of the sealing shell, and the range of the preload gap is 2~3mm.

2. The friction drive assembly for a flexible positioning system of a shell plate according to claim 1, characterized in that, The tracks are arranged at equal angles between each pair of adjacent tracks, with the angle ranging from 60° to 120°.

3. The friction drive assembly for a flexible positioning system of a shell plate according to claim 1, characterized in that, The clamping and fixing mechanism also includes an adjustment component for adjusting the distance between the telescopic part and the fixing part.

4. The friction drive assembly for a flexible positioning system of a shell plate according to claim 3, characterized in that, The adjustment assembly includes mounting plates respectively disposed on the fixed part and the telescopic part, and a lead screw mechanism passing through the two mounting plates. The lead screw mechanism includes a rotating lead screw passing through the two mounting plates along the line connecting the centers of the driven friction wheel and the driving friction wheel, and a second drive motor providing driving force for the rotation of the rotating lead screw.

5. The friction drive assembly for a flexible positioning system of a shell plate according to claim 1, characterized in that, The first drive motor includes a reducer and a servo motor that are connected in sequence to the rotating shaft.

6. The friction drive assembly for a flexible positioning system of a shell plate according to claim 1, characterized in that, The rolling surface of the active friction wheel is coated with polyurethane.

7. The friction drive assembly for a flexible positioning system of a shell plate according to claim 1, characterized in that, The rolling surface of the driven friction wheel is coated with polyurethane.

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