An experimental device for flexible assembly of weak-rigidity thin-walled structures

Abstract

The present invention belongs to the field of parts assembly technology and specifically discloses an experimental device for the flexible assembly of weak-rigidity thin-walled structures. The device comprises a base and at least two clamping modules arranged on the base along the X-direction. Each clamping module comprises a plurality of clamping units arranged side by side. Each clamping unit comprises a lower crossbeam frame structure and an upper crossbeam frame structure, each of which is slidably connected to the base in the X-direction at its bottom. The lower crossbeam frame structure is arranged below and inside the upper crossbeam frame structure, and at least two vertical, inverted, upwardly-mounted micrometers are mounted on its top along the Y-direction. A quick-action clamp mounted on the upper crossbeam frame structure is located above each micrometer. The experimental device of the present invention can adapt to the characteristics of thin-walled structures of different morphologies and can be fixed and assembled. It has a wide range of applications, high positioning accuracy, simple operation, and high experimental efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of parts assembly, in particular to an experimental device for flexible assembly of weak-rigidity thin-walled structures. Background Art

[0002] Product quality in engineering practice relies on error control during the assembly process. Analyzing assembly deviation sources and building a deviation propagation model during the design phase are crucial steps in this process. Assembly processes, particularly in the aerospace sector, often involve numerous large and weak parts, such as sheet metal and thin-walled structures. Deviations caused by deformation during assembly can significantly impact the final product quality.

[0003] Currently, there is limited research on the influence of deformation deviation sources on final assembly deviation and deviation prediction methods. Further research requires in-situ experiments. However, due to the complex surface morphology of thin-walled structures and the strong influence of different morphologies on assembly contact deformation and springback, the experimental setup needs to adapt to the characteristics of thin-walled structures with different morphologies and provide temporary fastening conditions for their assembly.

[0004] Although there are currently devices that can be used for the assembly and assembly tolerance analysis of flexible thin plate parts, such as the special fixture for flexible thin plate variable positioning strategy disclosed by CN202648634U and the special fixture for variable positioning thin plate based on manual dovetail groove slide disclosed by CN207387518U, both are achieved by setting up multiple positioning structures arranged circumferentially, and clamping the thin plate from all sides by setting a chuck on each positioning structure. The chuck can be relatively displaced with the positioning structure on the X and Y axes through the cooperation of the guide rail and the slider, and the position adjustment in the Z direction is achieved by adjusting the position of the nut or the positioning pin.

[0005] Although the above-mentioned device can be used to a certain extent for the assembly and fixation of thin-walled structures of different sizes and shapes, it has many defects: First, its applicability is limited. The position adjustment of each positioning structure is very limited. When the size difference of the thin plate is too large, the positioning structure is prone to cause spatial obstruction, which is difficult to adjust and apply. It has low flexibility and poor practicality. Second, the positioning accuracy is not high. It is difficult to ensure the positioning consistency of each positioning structure with each other, especially in the Z direction. It relies on nuts or positioning pins, which cannot meet the high-precision requirements of assembly deformation simulation in many fields. Third, it is inconvenient to operate. Each time a different thin-walled structure is assembled, it is necessary to adjust the positioning of each positioning structure one by one in all directions, which is a large workload and low efficiency. Summary of the Invention

[0006] To solve the above problems, the present invention provides an experimental device for flexible assembly of weak-rigidity thin-walled structures, which can adapt to the characteristics of thin-walled structures with different morphologies and perform fixed assembly on them. It has a wide range of applications, high positioning accuracy, simple operation and high experimental efficiency.

[0007] In order to achieve the above object, the specific technical solutions adopted by the present invention are as follows:

[0008] An experimental device for the flexible assembly of weak-rigidity thin-walled structures, comprising a base and at least two clamping modules arranged on the base along the X-direction, each clamping module comprising a plurality of clamping units arranged side by side (in the present invention, a plurality means at least two); each clamping unit comprises a lower crossbeam frame structure and an upper crossbeam frame structure, the bottoms of which are respectively connected to the base in an X-direction sliding manner; the lower crossbeam frame structure is arranged in the inner lower part of the upper crossbeam frame structure, and at least two vertical and inverted upwardly arranged liftable micrometers are installed on its top along the Y-direction, and a quick clamp mounted on the upper crossbeam frame structure is provided above each micrometer; the thin-walled structure is framed between the micrometer and the quick clamp and is clamped under the downward pressure of the quick clamp's pressure head.

[0009] When using the above device, a thin-walled structure is placed between the upper and lower crossbeam frame structures. It is clamped by pressing down with a quick-action clamp and adjusting the micrometer to achieve Z-axis positioning. The two thin-walled structures to be assembled are placed into two adjacent clamping modules, with their ends overlapping, and then fixedly assembled at the overlap. Thus, through the movable upper and lower crossbeam frame structures, the micrometers and quick-action clamps respectively provided on each, combined with the design of the clamping unit and clamping modules, precise positioning and fixed assembly of thin-walled structures can be achieved.

[0010] Preferably, the lower crossbeam frame structure includes a first frame body having a first crossbeam, and the micrometer is installed on a first slider, which is slidably connected to the first crossbeam in the Y direction to realize the position adjustment of the micrometer in the Y direction, which not only improves the flexibility of adjustment, but also realizes the adjustment of the number and spacing of support points of the thin-walled structure, thereby enabling the device of the present invention to provide good support for thin-walled structures of different sizes.

[0011] Furthermore, a first vertical beam with a bottom mounted on the base is respectively provided on both sides of the first horizontal beam; the micrometer is driven to rise and fall by a driving mechanism, and the driving mechanism includes a screw rod uprightly mounted on the first vertical beam, a lifting block sleeved on the screw rod and driven to rise and fall by the rotation of the screw rod, and a driving component that drives the screw rod to rotate; both sides of the first horizontal beam are fixedly connected to the lifting block.

[0012] Furthermore, the driving component includes a driven wheel installed at the bottom of the screw rod, a driving wheel arranged between the two driven wheels, a synchronous belt wound around the driving wheel and the driven wheel, and a motor connected to the driving wheel to drive it to rotate.

[0013] Furthermore, the bottom of each of the first vertical beams is fixedly connected to a first slide seat, and the first slide seat is slidably connected to the base in the X direction.

[0014] Preferably, the upper beam frame structure includes a second frame body having a second beam, and the quick clamp is installed on a second slider, and the second slider is connected to the second beam in a sliding manner in the Y direction, so that the quick clamp can be translated in the Y direction and cooperate with the micrometer.

[0015] Furthermore, a second vertical beam is provided on both sides of the second horizontal beam, and the bottom of each second vertical beam is fixedly connected to a second slide seat, and the second slide seat is slidably connected to the base in the X direction.

[0016] Furthermore, the quick clamp is a push-pull clamp, comprising a push-pull handle that pushes the pressure head downward as the handle pushes inward.

[0017] The present invention has the following beneficial effects:

[0018] 1. The present invention comprises a clamping unit composed of a lower crossbeam frame structure with a liftable and translatable micrometer and an upper crossbeam frame structure with a translatable quick clamp, which are assembled into a clamping module. A thin-walled structure is clamped and fixed in a clamping module. Two adjacent clamping modules can be used to assemble thin-walled structures, thereby achieving simulated assembly deformation of thin-walled structures, which can be applied to assembly tolerance analysis experiments.

[0019] 2. The present invention realizes Z-direction positioning by providing a screw drive mechanism, a micrometer and a quick clamp. Compared with the existing technology, the accuracy is significantly improved, fully meeting the high-precision assembly requirements.

[0020] 3. The structural design of the upper and lower clamping of the clamping module eliminates the space obstruction problem existing in the prior art. By adjusting the usage of the clamping unit and supplementing the fine adjustment of the micrometer, the present invention can adapt to thin-walled structures of different shapes and sizes, meet diverse assembly needs, have high flexibility and a wide range of applications; and the adjustment difficulty is low, the operation is simple, and the work efficiency is high.

[0021] 4. The present invention adopts the form of arranging multiple clamping modules horizontally. By adding clamping modules, it can be expanded to the synchronous assembly of multiple thin-walled structures, greatly improving work efficiency. The device has a compact structure, can save space, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1: A front view of the experimental device for flexible assembly of weak-rigidity thin-walled structures described in Example 1.

[0023] Figure 2 : Side view of the experimental device for flexible assembly of weak stiffness thin-walled structures described in Example 1.

[0024] Figure 3 : Partial assembly diagram of the experimental device for flexible assembly of weak-rigidity thin-walled structures described in Example 1.

[0025] Figure 4 : Flowchart of the assembly of the weak stiffness thin-walled structure in Example 1.

[0026] In the figure: 1-base, 2-lower beam frame structure, 3-upper beam frame structure; 11-guide rail, 12-connecting beam, 21-first frame, 22-first slider, 23-micrometer, 24-driving mechanism, 31-second frame, 32-second slider, 33-quick clamp; 211-first beam, 212-first vertical beam, 213-first slide, 241-screw, 242 lifting block, 243-driving wheel, 244-driven wheel, 245-synchronous belt, 246-motor, 311-second beam, 312-second vertical beam, 313-second slide, 331-push-pull handle, 332-pressing head. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] Example 1

[0029] An experimental device for flexible assembly of weak stiffness thin-walled structures, such as Figure 1-3As shown, it includes a base 1 and two clamping modules arranged on the base 1 along the X direction, each clamping module includes five clamping units arranged side by side; each clamping unit includes a lower crossbeam frame structure 2 and an upper crossbeam frame structure 3, the bottom of which are respectively connected to the base 1 in the X direction by sliding, and the lower crossbeam frame structure 2 is arranged below the upper crossbeam frame structure 3. The present invention breaks the thinking limitation of the prior art on the circumferential clamping and fixing of thin-walled structures, innovates the working mode of the device, and replaces the existing circumferential clamping and fixing with upper and lower clamping and fixing; specifically, it adopts the form of arranging multiple clamping modules in the horizontal direction, each clamping module is equipped with a thin-walled structure, and the thin-walled structure is fixed by using multiple clamping units of the clamping module. The clamping units are formed between the lower crossbeam frame structure 2 and the upper crossbeam frame structure 3 to accommodate the thin-walled structure, and positioning structures (micrometer 23 and quick clamp 33) are installed on both to clamp and fix the thin-walled structure up and down. Such a structural design can fully eliminate the spatial obstacles of the positioning structure. Thin-walled structures of different sizes can be clamped and fixed by simply changing the number of micrometers 23 and quick clamps 33 used. It has high flexibility, significantly reduces the difficulty of adjustment, and improves applicability.

[0030] More specifically, the base 1 includes two guide rails 11 and connecting beams 12. The guide rails 11 are provided with two parallel to each other along the X direction, and the connecting beam 12 is perpendicular to the two guide rails 11 and provided therebetween. A connecting beam 12 is provided below each clamping unit.

[0031] The lower crossbeam frame structure 2 comprises a first frame 21, a first slider 22, a micrometer 23, and a drive mechanism 24. The first frame 21 comprises a first crossbeam 211 at the top, two first vertical beams 212 on either side of the first crossbeam 211, and a first slide 213 at the bottom of each first vertical beam 212, slidably connected to the base 1 in the X direction. Two first sliders 22 are provided, each slidably connected to the first crossbeam 211 in the Y direction. Each first slider 22 is mounted with a micrometer 23, which is vertically and inverted, facing upward, and is driven up and down by the drive mechanism 24. Adjusting the scale of the micrometer 23 allows the Z-direction position of the thin-walled structure to be adjusted, thereby accommodating the characteristics of thin-walled structures of varying morphologies. Furthermore, by adjusting the micrometer scale to the same value within a clamping module, consistent Z-direction positioning is achieved. Compared to the prior art method of adjusting individual positioning structures using nuts or locating pins, this significantly improves the accuracy and consistency of Z-direction positioning, greatly reducing the workload and difficulty of adjustment, and significantly increasing efficiency. In addition, the thin-walled structure is mounted on the micrometer 23, and the first slider 22 drives the micrometer 23 to translate in the Y direction. This design makes the number of support points of the thin-walled structure adjustable. On the one hand, the number of micrometers 23 used can be achieved not only by rotating its button to adjust the top position, but also by translating the slider to move itself away from / into the thin-walled structure area, which increases the adjustment dimension, expands the adjustment area, and further improves the applicability; on the other hand, each clamping module can determine the number of support points according to the weight of the thin-walled structure. When it is light, the number of support points can be reduced to reduce the adjustment workload. When it is heavy, the number of support points can be increased to reduce the pressure on a single micrometer 23, thereby reducing damage and increasing the service life.

[0032] The drive mechanism 24 includes two screw rods 241 mounted upright on the two first vertical beams 212, a lifting block 242 sleeved on the screw rods 241 and driven up and down by the screw rods 241, and a rotating component that drives the screw rods 241. Both sides of the first crossbeam 211 are fixedly connected to the lifting block 242. The rotating component includes two driven wheels 244 mounted at the bottom of the two screw rods 241, a driving wheel 243 positioned between the two driven wheels 244, a synchronous belt 245 wound around the driving wheel 243 and the driven wheel 244, and a motor 246 connected to the driving wheel 243 to drive its rotation. The motor 246 is mounted on the connecting beam 12. The micrometer 23 is coarsely adjusted in the Z direction by the screw rods, and then fine-tuned by the micrometer 23, ensuring the accuracy of the Z-direction positioning of thin-walled structures and fully meeting the high-precision requirements for assembly deformation simulation in various fields.

[0033] The upper crossbeam frame structure 3 includes a second frame 31, a second slider 32, and a quick clamp 33. The second frame 31 includes a second crossbeam 311 at the top, two second vertical beams 312 on either side of the second crossbeam 311, and a second slide 313 at the bottom of each second vertical beam 312, slidably connected to the base 1 in the X direction. Two second sliders 32 are provided, each slidably connected to the second crossbeam 311 in the Y direction. Each second slider 32 is mounted with a quick clamp 33. The quick clamp 33 is located above the micrometer 23, corresponding to each other. The quick clamp 33's translational design in the Z direction allows it to accommodate changes in the position and number of micrometers 23. The quick clamp 33 is a push-pull clamp, including a push-pull handle 331 and a pressure head 332 that presses downward as the push-pull handle 331 is pushed inward. The thin-walled structure is positioned between the micrometer 23 and the quick clamp 33 and is clamped by the downward pressure of the pressure head 332. After the position of the micrometer 23 is adjusted, the thin-walled structure is placed on it. The thin-walled structure can be clamped and fixed by simply pushing the handle 331 inward. Compared with the prior art of holding the thin plate by hand and clamping the thin plate from all sides with the chucks of each positioning mechanism at the same time, the operation is obviously simpler and saves time and effort.

[0034] The process of flexible assembly of weak stiffness thin-walled structures using the above experimental device can be divided into four steps: positioning, clamping, connection and release (e.g. Figure 4 The following is a detailed description of how to use the device:

[0035] Step 1: Position the micrometer 23 and quick clamp 33 of the clamping unit by sliding the lower crossbeam frame structure 2 and the upper crossbeam frame structure 3 in the X direction, sliding the first slider 22 and the second slider 32 in the Y direction, turning on the motor 246, and rotating the knob of the micrometer 33 to adjust the position in the Z direction. Place the two flexible wall panels on the micrometer 23 of each clamping module, overlap the ends of the two panels, and complete the assembly and positioning.

[0036] Step 2: Push the push-pull handle 331 and press the pressure head 332 downward, so that the quick clamp 33 and the micrometer 23 clamp the flexible wall panel up and down;

[0037] Step 3: Drill and rivet the flexible wall panels at the overlap position;

[0038] Step 4: Pull out the push-pull handle 331 to release the clamping unit and wait for the flexible sheet to complete deformation in preparation for subsequent measurement experiments.

[0039] This specific implementation is merely an explanation of the present invention and is not a limitation of the present invention. Any changes made by those skilled in the art after reading the specification of the present invention will be protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. An experimental device for flexible assembly of weak-rigidity thin-walled structures, characterized by: The invention comprises a base (1) and at least two clamping modules arranged on the base (1) along the X direction, each clamping module comprising a plurality of clamping units arranged side by side; each clamping unit comprises a lower crossbeam frame structure (2) and an upper crossbeam frame structure (3) whose bottoms are respectively connected to the base (1) in a sliding manner in the X direction; The lower crossbeam frame structure (2) is arranged at the inner lower part of the upper crossbeam frame structure (3), and at least two vertical and inverted upwardly arranged liftable micrometers (23) are installed on the top along the Y direction. A quick clamp (33) installed on the upper crossbeam frame structure (3) is provided above each micrometer (23); the thin-walled structure is placed between the micrometer (23) and the quick clamp (33), and is clamped under the downward pressure of the pressure head (332) of the quick clamp (33).

2. The experimental device for flexible assembly of weak-rigidity thin-walled structures according to claim 1, characterized in that: The lower crossbeam frame structure (2) comprises a first frame body (21) having a first crossbeam (211); the micrometer (23) is mounted on a first slider (22); and the first slider (22) is connected to the first crossbeam (211) in a sliding manner in the Y direction.

3. The experimental device for flexible assembly of weak-rigidity thin-walled structures according to claim 2, characterized in that: A first vertical beam (212) having a bottom portion mounted on the base (1) is provided on both sides of the first horizontal beam (211); the micrometer (23) is driven to rise and fall by a driving mechanism (24), the driving mechanism (24) comprising a screw rod (241) vertically mounted on the first vertical beam (212), a lifting block (242) sleeved on the screw rod (241) and driven to rise and fall by the screw rod (241), and a driving component for driving the screw rod (241) to rotate; both sides of the first horizontal beam (211) are fixedly connected to the lifting block (242).

4. The experimental device for flexible assembly of weak-rigidity thin-walled structures according to claim 3, characterized in that: The driving component comprises a driven wheel (244) mounted at the bottom of the screw rod (241), a driving wheel (243) arranged between the two driven wheels (244), a synchronous belt (245) wound around the driving wheel (243) and the driven wheel (244), and a motor (246) connected to the driving wheel (243) to drive the driving wheel (243) to rotate.

5. The experimental device for flexible assembly of weak-rigidity thin-walled structures according to claim 3, characterized in that: The bottom of each first vertical beam (212) is fixedly connected to a first slide seat (213), and the first slide seat (213) is slidably connected to the base (1) in the X direction.

6. The experimental device for flexible assembly of weak-rigidity thin-walled structures according to any one of claims 1 to 5, characterized in that: The upper beam frame structure (3) comprises a second frame body (31) having a second beam (311); the quick clamp (33) is mounted on a second slider (32); and the second slider (32) is connected to the second beam (311) in a Y-direction sliding manner.

7. The experimental device for flexible assembly of weak-rigidity thin-walled structures according to claim 6, characterized in that: A second vertical beam (312) is provided on both sides of the second horizontal beam (311), and the bottom of each second vertical beam (312) is fixedly connected to a second slide seat (313). The second slide seat (313) is slidably connected to the base (1) in the X direction.

8. The experimental device for flexible assembly of weak-rigidity thin-walled structures according to claim 6, characterized in that: The quick clamp (33) is a push-pull clamp, comprising a push-pull handle (331) that pushes the pressure head (332) downward as the handle pushes inward.

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