Rack swing structure of skin stretcher

Abstract

The invention provides a yoke frame swing structure of a skin stretcher, which comprises a seat bracket rotating shaft, a rack, a bracket sliding block, a rotating shaft and an oil cylinder, and can be driven by the oil cylinder to rotate, so that the pitching angle of a jaw of the stretcher can be controlled and adjusted with high precision, and the requirement of complex curved surface forming in skin part manufacturing can be met; the number of corollary equipment and procedures needed in the existing multi-direction curved surface machining process is reduced, and the manufacturing cost is remarkably reduced while the production efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the technical field of aircraft skin manufacturing equipment, specifically relating to a swing structure of a skin stretching machine. Background Technology

[0002] As a core piece of equipment in the processing of aircraft skin parts, most skin stretching machines currently only support stretching actions in a single direction and on a two-dimensional plane. When processing complex curved parts in multiple directions, it is necessary to use other types of forming equipment (such as multi-axis punching machines or curved surface punching machines) to complete the process. This not only leads to the complexity and long production time of skin parts processing, but also makes it difficult to reduce the cost of manpower, material resources and resource consumption. Summary of the Invention

[0003] In view of this, and in response to the technical problems existing in the field, the present invention provides a frame swing structure for a skin stretching machine, including a seat bracket rotating shaft, a frame, a bracket slider, a rotating shaft, and a hydraulic cylinder; The bracket slider is connected to the hydraulic cylinder and can slide horizontally along the frame under the drive of the hydraulic cylinder; a rotating shaft is set on the bracket slider; the seat bracket rotating shaft is set on the rotating shaft and can swing horizontally within a certain angle range on the bracket slider; one end of the seat bracket rotating shaft is connected to the U-shaped arm of the clamping fixture, and the U-shaped arm can rotate around the seat bracket rotating shaft to realize the pitch angle adjustment of the clamping fixture.

[0004] Furthermore, the bracket slider has a groove below it; a raised bracket base plate is fixedly installed on the frame to cooperate with the groove to realize the relative sliding between the bracket slider and the frame.

[0005] Furthermore, a bracket support plate is installed on each of the two sides of the bracket slider perpendicular to its sliding direction; a bracket cover plate is provided at the upper end of the bracket support plate; the upper surface of the bracket slider and the lower surface of the bracket cover plate are provided with slots for fixing the upper and lower edges of the bracket support plate; the seat bracket pivot is located inside the space formed by the bracket slider, the bracket support plate and the bracket cover plate, and the bracket support plate restricts the horizontal rotation angle of the seat bracket pivot.

[0006] Furthermore, a planar area is provided on each side of the seat bracket pivot facing the bracket support plate, and the bracket support plate has a concave arc surface at the corresponding position of the planar area; a pair of rotating wear-resistant columns with arc-shaped cross-sections are respectively provided on both sides of the seat bracket pivot, and their upper and lower ends abut against the upper surface of the bracket slider and the lower surface of the bracket cover plate and can slide. One side of their planar column abuts against the planar area to clamp the seat bracket pivot, and the other side of their arc surface abuts against the concave arc surface of the bracket support plate and can slide relative to each other; thus, the seat bracket pivot and the pair of rotating wear-resistant columns form a whole and can rotate horizontally together under the angle restriction of the bracket support plate.

[0007] Furthermore, the portion of the seat bracket pivot located within the space has a rectangular cross-section, while the portion extending out of the enclosed space and connected to the U-shaped arm has a circular cross-section; the upper and lower surfaces of the seat bracket pivot, the upper surface of the bracket slider, and the lower surface of the bracket cover are all provided with bracket slide bars for mutual sliding.

[0008] Furthermore, the bracket slider is provided with multiple screw holes, and the bracket support plate and bracket cover plate are provided with multiple through holes corresponding to the screw holes; multiple double-body studs pass through the through holes of the bracket support plate and bracket cover plate, and are respectively fixed with the screw holes on the bracket slider and multiple super nuts above the bracket cover plate.

[0009] Accordingly, the present invention also provides a skin stretching machine, comprising one of the above-mentioned eccentric swing structures on the left and right sides. The seat bracket of each eccentric swing structure is connected to the U-shaped arm of the clamping fixture on the skin stretching machine, which enables the adjustment of the pitch angle of the clamping fixture. Under the coordinated drive of the corresponding left and right hydraulic cylinders, the two eccentric swing structures can realize the horizontal swing adjustment of the clamping fixture.

[0010] The swing structure of the skin stretching machine provided by the present invention can perform rotational action under the drive of the hydraulic cylinder, realize high-precision control and adjustment of the pitch angle of the stretching machine jaws, meet the complex curved surface forming requirements in the manufacturing of skin parts, reduce the number of supporting equipment and processes required for existing multi-directional curved surface processing, and significantly reduce manufacturing costs while improving production efficiency. Attached Figure Description

[0011] Figure 1 A top view of the oscillating structure of the skin stretching machine provided by the present invention; Figure 2 This is a side view of the truss swing structure of the skin stretching machine provided by the present invention; Figure 3 An exploded view of the oscillating structure of the skin stretching machine provided by the present invention; Figure 4 This is a diagram illustrating the rotational oscillation mode of the frame oscillation structure of the skin stretching machine provided by the present invention. Detailed Implementation

[0012] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0013] The truss swing structure of the skin stretching machine provided by this invention, such as Figure 1-3As shown, it includes a seat bracket rotating shaft 1, a frame 2, a bracket slider 6, a rotating shaft 7, and hydraulic cylinders 12 and 13; The bracket slider 6 is connected to the hydraulic cylinder and can slide horizontally along the frame 2 under the drive of the hydraulic cylinder; a rotating shaft 7 is provided on the bracket slider 6; the seat bracket rotating shaft 1 is provided on the rotating shaft 7 and can swing horizontally within a certain angle range, such as ±10°, on the bracket slider 6. Figure 4 As shown; one end of the seat bracket rotating shaft 1 is connected to the U-shaped arm of the clamping fixture. The U-shaped arm can rotate around the seat bracket rotating shaft 1 to realize the pitch angle adjustment of the clamping fixture.

[0014] In a preferred embodiment of the present invention, the bracket slider 6 has a groove below it; a protruding bracket base plate 5 is fixedly provided on the frame 2 for cooperating with the groove to realize the relative sliding between the bracket slider 6 and the frame 2.

[0015] In a preferred embodiment of the present invention, a bracket support plate 3 is installed on each of the two sides of the bracket slider 6 perpendicular to its sliding direction; a bracket cover plate 9 is provided at the upper end of the bracket support plate 3; the upper surface of the bracket slider 6 and the lower surface of the bracket cover plate 9 are provided with slots for fixing the upper and lower edges of the bracket support plate 3; the seat bracket rotating shaft 1 is partially disposed inside the space formed by the bracket slider 6, the bracket support plate 3 and the bracket cover plate 9, and the bracket support plate 3 restricts the horizontal rotation angle of the seat bracket rotating shaft.

[0016] In a preferred embodiment of the present invention, a planar region is provided on each side of the seat bracket pivot 1 facing the bracket support plate 3, and the bracket support plate 3 has a concave arc surface at the corresponding position of the planar region; a pair of rotating wear-resistant columns 4 with arc-shaped cross sections are respectively provided on both sides of the seat bracket pivot 1, and their upper and lower ends respectively abut against the upper surface of the bracket slider 6 and the lower surface of the bracket cover plate 9 and can slide, with one side of the planar region abutting against the planar region to clamp the seat bracket pivot 1, and the other side of the arc surface abutting against the concave arc surface of the bracket support plate 3 and can slide relative to each other; thus, the seat bracket pivot 1 and the pair of rotating wear-resistant columns form a whole, and can rotate horizontally together under the angle restriction of the bracket support plate 3.

[0017] In a preferred embodiment of the present invention, the cross-section of the portion of the seat bracket pivot located within the space is rectangular, and the cross-section of the portion extending out of the enclosed space and connected to the U-shaped arm is circular; the upper and lower surfaces of the seat bracket pivot, the upper surface of the bracket slider 6, and the lower surface of the bracket cover plate 9 are all provided with bracket slide strips 10 for mutual cooperation and sliding.

[0018] In a preferred embodiment of the present invention, the bracket slider 6 is provided with a plurality of screw holes, and the bracket support plate 3 and the bracket cover plate 9 are provided with a plurality of through holes corresponding to the screw holes; a plurality of double-body studs 11 pass through the through holes of the bracket support plate 3 and the bracket cover plate 9, and are respectively fixed to the screw holes on the bracket slider 6 and the plurality of super nuts 8 above the bracket cover plate.

[0019] Accordingly, the present invention also provides a skin stretching machine, comprising one of the above-mentioned eccentric swing structures on the left and right sides. The seat bracket of each eccentric swing structure is connected to the U-shaped arm of the clamping fixture on the skin stretching machine, which enables the adjustment of the pitch angle of the clamping fixture. Under the coordinated drive of the corresponding left and right hydraulic cylinders, the two eccentric swing structures can realize the horizontal swing adjustment of the clamping fixture.

[0020] When the stroke outputs of the two cylinders on either side of the oscillating mechanism are not completely synchronized, an asymmetrical driving torque can be generated. Utilizing this characteristic, this invention can flexibly control the worktable to produce different tilt angles in different directions. By precisely adjusting the hydraulic parameters, multi-angle composite surface forming can be achieved during the processing of aircraft skin parts, meeting the processing requirements of complex-shaped parts. Furthermore, when performing less complex skin processing, the synchronization requirements of the left and right cylinders can be appropriately reduced according to the actual situation.

[0021] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "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 invention 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 invention.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] It should be understood that the sequence number of each step in the embodiments of the present invention does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0024] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A swing structure for a skin stretching machine, characterized in that: Includes a bracket pivot, frame, bracket slider, rotating shaft, and hydraulic cylinder; The bracket slider is connected to the hydraulic cylinder and can slide horizontally along the frame under the drive of the hydraulic cylinder; a rotating shaft is set on the bracket slider; the seat bracket rotating shaft is set on the rotating shaft and can swing horizontally within a certain angle range on the bracket slider; one end of the seat bracket rotating shaft is connected to the U-shaped arm of the clamping fixture, and the U-shaped arm can rotate around the seat bracket rotating shaft to realize the pitch angle adjustment of the clamping fixture.

2. The oscillating structure of the skin stretching machine as described in claim 1, characterized in that: The bracket slider has a groove below it; a raised bracket base plate is fixed on the frame to cooperate with the groove to achieve relative sliding between the bracket slider and the frame.

3. The oscillating structure of the skin stretching machine as described in claim 1, characterized in that: A bracket support plate is installed on each of the two sides of the bracket slider perpendicular to its sliding direction; a bracket cover plate is provided at the upper end of the bracket support plate; the upper surface of the bracket slider and the lower surface of the bracket cover plate are provided with slots for fixing the upper and lower edges of the bracket support plate; the seat bracket pivot is located inside the space formed by the bracket slider, the bracket support plate and the bracket cover plate, and the bracket support plate restricts the horizontal rotation angle of the seat bracket pivot.

4. The oscillating structure of the skin stretching machine as described in claim 3, characterized in that: The seat bracket pivot has a planar area on each side facing the bracket support plate, and the bracket support plate has a concave arc surface at the corresponding position of the planar area. A pair of rotating wear-resistant columns with arc-shaped cross-sections are respectively arranged on both sides of the seat bracket pivot. Their upper and lower ends abut against the upper surface of the bracket slider and the lower surface of the bracket cover plate, respectively, and can slide. One side of their planar column abuts against the planar area to clamp the seat bracket pivot, and the other side of their arc surface abuts against the concave arc surface of the bracket support plate and can slide relative to each other. Thus, the seat bracket pivot and the pair of rotating wear-resistant columns form a whole, and can rotate horizontally together under the angle restriction of the bracket support plate.

5. The oscillating structure of the skin stretching machine as described in claim 3, characterized in that: The portion of the seat bracket pivot located within the space has a rectangular cross-section, while the portion extending out of the enclosed space and connected to the U-shaped arm has a circular cross-section. The upper and lower surfaces of the seat bracket pivot, the upper surface of the bracket slider, and the lower surface of the bracket cover are all provided with bracket sliding strips for mutual cooperation and sliding.

6. The oscillating structure of the skin stretching machine as described in claim 3, characterized in that: The bracket slider has multiple screw holes, and the bracket support plate and bracket cover plate have multiple through holes corresponding to the screw holes; multiple double-body studs pass through the through holes of the bracket support plate and bracket cover plate, and are fixed to the screw holes on the bracket slider and the multiple super nuts on the bracket cover plate respectively.

7. A skin stretching machine, characterized in that: The device includes a left and a right eccentric swing structure as described in any one of claims 1-6. The seat bracket of each eccentric swing structure is connected to the U-shaped arm of the clamping fixture on the skin stretching machine, which enables the pitch angle adjustment of the clamping fixture. The two eccentric swing structures, driven by corresponding left and right hydraulic cylinders, enable the horizontal swing adjustment of the clamping fixture.

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