Assembly clamp tool

Abstract

The utility model relates to spaceflight thin -walled cylinder component assembly technical field discloses a kind of assembly clamping tool, including base, first lifting support, second lifting support, crank slider mechanism, first connecting rod mechanism, second connecting rod mechanism, locking mechanism and tray, first lifting support and second lifting support are respectively vertically laid on base;Tray is movably laid on first lifting support by first connecting rod mechanism and crank slider mechanism connection, constitutes overturning structure system, overturning structure system is movably locked by locking mechanism;Tray is also movably laid on second lifting support by second connecting rod mechanism, to assist overturning structure system overturning and after locking, it is assisted to support overturning structure system. Structure is reasonable, easy to operate, adjustable range is big and can adapt to multiple assembly working condition, to solve the existing conical thin -walled cylinder component clamping tool rotation angle range is limited, cannot take into account simple structure and multi-working condition adaptability technical problem.

Description

Technical Field

[0001] This utility model relates to the field of aerospace thin-walled cylindrical component assembly technology, and in particular, to an assembly clamping fixture. Background Technology

[0002] In the manufacturing of aerospace components, conical thin-walled cylindrical components, due to their special structure, typically require the installation of various parts internally, such as beams, supports, and corner boxes. These components are generally made of carbon fiber composite materials, which are characterized by high strength and light weight. Furthermore, the components are open at both ends and have a regular shape, making them suitable for assembly using end-face clamping methods. The assembly process mainly includes drilling, gluing, and screwing. Among these, the gluing process requires extremely high assembly precision; any defects can lead to lengthy rework or even render the component unusable.

[0003] Due to the limited internal space of components and the need for assembly operations to be performed from the outer surface of the components, traditional clamping or wrap-around clamping fixtures are prone to interference with the assembly process and cannot meet the usage requirements. Therefore, existing technologies mostly employ end-face clamping methods and utilize spatial linkage mechanisms to adjust the position and orientation of the components. Currently, a common spatial planar control mechanism is the spherical parallel mechanism, such as the 3-RRR spherical parallel mechanism. This mechanism, through the geometric constraints of spatial linkages, restricts the motion of the plane to pure rotation around a fixed point, achieving directional adjustment of the plane in space.

[0004] However, existing spherical parallel mechanisms have the following shortcomings: if structural simplification is pursued, the adjustable angle range of the plane is limited, typically only achieving about 90° of rotation, which is insufficient to meet the needs of various assembly conditions; if the rotation range needs to be expanded to 180° while ensuring posture stability, the mechanism design becomes complex and manufacturing costs increase significantly, requiring precision equipment such as multi-axis robotic arms, which is not conducive to widespread use. Furthermore, in existing technologies, to adapt to different assembly conditions, multiple sets of dedicated clamping fixtures are often required, resulting in a large number of fixtures, frequent switching, increased operational complexity, labor intensity, and assembly cycle time, affecting batch production efficiency. Utility Model Content

[0005] This utility model provides an assembly clamping fixture with a reasonable structure, simple operation, large adjustable range, and adaptability to various assembly conditions, thereby solving the technical problems of existing clamping fixtures for conical thin-walled cylindrical components having a limited range of rotation angles and being unable to balance structural simplicity with adaptability to multiple working conditions.

[0006] This utility model provides an assembly clamping fixture, including a base, a first lifting bracket, a second lifting bracket, a crank-slider mechanism, a first connecting rod mechanism, a second connecting rod mechanism, a locking mechanism, and a tray. The first and second lifting brackets are respectively vertically arranged on the base. The tray is movably arranged on the first lifting bracket through the first connecting rod mechanism and the crank-slider mechanism, forming a flipping structure system. The flipping structure system is movably locked by the locking mechanism. The tray is also movably arranged on the second lifting bracket through the second connecting rod mechanism to assist the flipping structure system in flipping and to provide auxiliary support for the flipping structure system after locking.

[0007] Furthermore, the crank-slider mechanism includes a crank rod, a rotating ring, and a sector-shaped counterweight; the rotating ring is rotatably connected to the top of the first lifting bracket, and the rotating shaft is arranged perpendicular to the axis of the first lifting bracket; the first end of the crank rod is connected to the rotating ring, the second end of the crank rod is connected to the tray, the sector-shaped counterweight is arranged on the rotating ring and coaxially with the rotating ring, and there is a clearance groove between the sector-shaped counterweight and the rotating ring and / or the top of the first lifting bracket; the integrated mechanism formed by the combination of the sector-shaped counterweight and the rotating ring is arranged with its center of gravity opposite to that of the tray.

[0008] Furthermore, an arc-shaped groove is provided on the rotating ring, and a limiting pin passes through the first lifting bracket and the arc-shaped groove to limit the rotation range of the rotating ring relative to the first lifting bracket.

[0009] Furthermore, the first linkage mechanism includes a slider and a first linkage unit. The slider is located below the crank-slider mechanism and is slidably sleeved outside the first lifting bracket. The first linkage unit is U-shaped. The first end of the first linkage unit is rotatably connected to the end of the crank rod near the tray, and the second end of the first linkage unit is rotatably connected to the slider. The two sets of first linkage units are arranged symmetrically.

[0010] Furthermore, the first linkage unit extends axially and forms the first inner support rod of the tray.

[0011] Furthermore, the tray is ring-shaped, and the tray also includes a second inner support rod that is arranged perpendicularly to and / or obliquely to the first inner support rod.

[0012] Furthermore, the locking mechanism employs a locking ring positioned below the slider, which is threaded onto the outside of the first lifting bracket. Rotating the locking ring restricts the downward movement of the slider and, in conjunction with the tray and the load on the tray, achieves locking. Alternatively, the locking mechanism employs locking rings positioned above and below the slider, respectively, which are threaded onto the outside of the first lifting bracket. Rotating both sets of locking rings restricts the axial position of the slider, thereby achieving locking.

[0013] Furthermore, the second linkage mechanism includes a first universal joint, a cross link, a second universal joint, and a second link; the first universal joint is rotatably mounted on the upper end of the second lifting bracket, the first universal joint is rotatably connected to the second universal joint via the cross link, the second universal joint is rotatably connected to the first end of the second link, and the second end of the second link is connected to the tray.

[0014] Furthermore, the first lifting support adopts a first threaded sleeve, and the second lifting support adopts a second threaded sleeve; a set of second lifting supports is provided on both sides of the first lifting support, and the two sets of second lifting supports are symmetrically arranged relative to the first lifting support.

[0015] Furthermore, the first lifting support and / or the second lifting support adopt jacks or hydraulic cylinders; a set of second lifting supports is provided on each side of the first lifting support, and the two sets of second lifting supports are symmetrically arranged relative to the first lifting support.

[0016] Furthermore, the base adopts a cross-shaped rod base or a grid-shaped rod base.

[0017] This utility model has the following beneficial effects: 1. Achieves large-angle and stable spatial posture adjustment: Through the flipping structure system consisting of a crank-slider mechanism, a first linkage mechanism, and a first lifting bracket, the linear sliding motion is transformed into the angular flipping motion of the tray. Combined with the flexibility of the first and second linkage mechanisms, the conical cylindrical component fixed on the tray can be adjusted in a wide range of positions in space; it can even expand the rotation range of the tray from about 90° in the traditional solution to 180°, thereby meeting the needs of more assembly conditions.

[0018] 2. The structure has been optimized, balancing rigidity and functionality: The second linkage mechanism connects the pallet and the second lifting bracket, playing an auxiliary guiding and supporting role during the pallet flipping process, enhancing the stability of the entire flipping process; after the position is locked by the locking mechanism, the second linkage mechanism, together with the first lifting bracket and the crank-slider mechanism, forms a stable spatial support frame, which significantly improves the overall rigidity and stability of the pallet under load, effectively preventing vibration and deformation during processing or assembly, and ensuring assembly accuracy.

[0019] 3. Improved tooling versatility and efficiency: The locking mechanism allows the flipping structure system to be reliably fixed at any required position, enabling a single tooling set to be quickly adjusted and locked to precisely adapt to various assembly angles and working conditions (such as horizontal, vertical, and inclined postures), replacing the previous need for multiple sets of dedicated tooling, reducing tooling changeover time, simplifying the operation process, providing convenience for batch assembly of workpieces, and helping to improve overall assembly efficiency.

[0020] 4. Ingenious structural design and high reliability: The combination of crank-slider mechanism and spatial linkage mechanism utilizes the lever and slider principle to achieve labor-saving transmission and control. This combination of mechanisms avoids the use of complex and expensive multi-axis robotic arms, and while expanding the adjustment range, it ensures the simplicity, reliability and economy of the mechanical structure.

[0021] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0022] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 This is a schematic diagram of the assembly clamping tool according to a preferred embodiment of the present invention; Figure 2 This is a schematic diagram of the crank-slider mechanism according to a preferred embodiment of the present invention; Figure 3 This is a schematic diagram of the second linkage mechanism of a preferred embodiment of the present invention.

[0023] Legend: 1. Base; 2. First lifting bracket; 201. Locking ring; 3. Second lifting bracket; 4. Crank-slider mechanism; 401. Crank rod; 402. Rotating ring; 403. Fan-shaped counterweight; 404. Clearance groove; 405. Rotating shaft; 406. Arc groove; 407. Limit pin; 5. First linkage mechanism; 501. Slider; 502. First linkage unit; 6. Second linkage mechanism; 601. First universal joint; 602. Cross linkage; 603. Second universal joint; 604. Second linkage; 7. Locking mechanism; 8. Tray; 801. First inner support rod; 802. Ring-shaped; 803. Second inner support rod. Detailed Implementation

[0024] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0025] like Figure 1 , Figure 2 and Figure 3As shown, the assembly clamping fixture of this embodiment includes a base 1, a first lifting bracket 2, a second lifting bracket 3, a crank-slider mechanism 4, a first connecting rod mechanism 5, a second connecting rod mechanism 6, a locking mechanism 7, and a tray 8. The first lifting bracket 2 and the second lifting bracket 3 are respectively arranged vertically on the base 1. The tray 8 is movably arranged on the first lifting bracket 2 through the first connecting rod mechanism 5 and the crank-slider mechanism 4, forming a flipping structure system. The flipping structure system is movably locked by the locking mechanism 7. The tray 8 is also movably arranged on the second lifting bracket 3 through the second connecting rod mechanism 6 to assist the flipping structure system in flipping and to provide auxiliary support for the flipping structure system after locking. This utility model assembly clamping fixture, through a flipping structure system composed of a crank-slider mechanism 4, a first linkage mechanism 5, and a first lifting bracket 2, transforms linear sliding motion into angular flipping motion of the tray 8. Combining the flexibility of the first linkage mechanism 5 and the second linkage mechanism 6, the conical cylindrical component fixed on the tray 8 can undergo a wide range of posture adjustments in space; it can even expand the rotation range of the tray 8 from approximately 90° in traditional solutions to 180°, thus meeting the needs of more assembly conditions. The second linkage mechanism 6 connects the tray 8 and the second lifting bracket 3, playing an auxiliary guiding and supporting role during the flipping process of the tray 8, enhancing the stability of the entire flipping process. After the locking mechanism 7 completes the posture locking, the second linkage mechanism 6, the first lifting bracket 2, and the crank-slider mechanism 4 together form a stable spatial support frame, significantly improving the overall rigidity and stability of the tray 8 under load, effectively preventing vibration and deformation during processing or assembly, and ensuring assembly accuracy. The locking mechanism 7 allows the flipping structure system to be reliably fixed at any required position. This enables a single tooling unit to be quickly adjusted and locked, precisely adapting to various assembly angles and working conditions (such as horizontal, vertical, and inclined orientations). This replaces the previous need for multiple sets of dedicated tooling, reducing tooling changeover time, simplifying the operation process, facilitating batch assembly of workpieces, and improving overall assembly efficiency. Combining the crank-slider mechanism 4 with the spatial linkage mechanism utilizes lever and slider principles to achieve effortless transmission and control. This combination avoids the use of complex and expensive multi-axis robotic arms, expanding the adjustment range while ensuring the simplicity, reliability, and economy of the mechanical structure. This utility model assembly clamping fixture, through the synergistic effect of the flipping structure system composed of "crank slider-connecting rod" and the auxiliary support connecting rod, provides a clamping fixture with a reasonable structure and simple operation, expanding the spatial posture adjustment range of the fixture (up to 180°). At the same time, the double bracket support and locking design ensures the load-bearing rigidity and positioning stability, thus achieving the goal of one fixture adapting to multiple assembly conditions, effectively overcoming the defects of existing technologies such as limited adjustment range, need for multiple sets of fixtures, complex structure or insufficient stability.Clamping in assembly clamping fixtures refers to fixing and maintaining the position and posture. As long as the workpiece is positioned, supported and fixed, it can be called "clamping" regardless of any one or more of the methods such as "grabbing, supporting, pushing, sucking, and locking".

[0026] like Figure 1 and Figure 2 As shown, in this embodiment, the crank-slider mechanism 4 includes a crank rod 401, a rotating ring 402, and a fan-shaped counterweight 403; the rotating ring 402 is rotatably connected to the top end of the first lifting bracket 2, and the rotating shaft 405 is arranged perpendicularly to the axis of the first lifting bracket 2; the first end of the crank rod 401 is connected to the rotating ring 402, the second end of the crank rod 401 is connected to the tray 8, the fan-shaped counterweight 403 is arranged on the rotating ring 402 and is coaxial with the rotating ring 402, and there is a clearance groove 404 between the fan-shaped counterweight 403 and the rotating ring 402 and / or at the top end of the first lifting bracket 2; the integrated mechanism formed by the combination of the fan-shaped counterweight 403 and the rotating ring 402 is arranged with its center of gravity opposite to that of the tray 8. A rotating ring 402 is rotatably mounted on the top of the first lifting bracket 2 and connects to the first end of the crank 401, forming a pivot point. This extends the lever arm for driving the tray 8 to rotate to the radius of the rotating ring 402. Utilizing the lever principle, the operator only needs to apply a small force to the crank 401 or the rotating ring 402 to drive the load (tray 8 and workpiece) to rotate over a wide range from 0° to 180°, making operation effortless. A sector-shaped counterweight 403 is coaxially mounted with the rotating ring 402 and arranged relative to the center of gravity of the tray 8, forming a balanced configuration. When the tray 8, carrying the workpiece, rotates to different angles, the sector-shaped counterweight 403 generates a balancing torque opposite to the gravitational torque of the tray 8 and the workpiece, thus significantly offsetting most of the overturning torque generated by the load. This not only greatly reduces the external force required for driving but also reduces the load on the locking mechanism 7, making the entire rotation process smoother and less impactful, thus improving the stability and safety of the system. The clearance groove 404 provided between the fan-shaped counterweight 403 and the rotating ring 402 and / or at the top of the first lifting bracket 2 provides the necessary physical space for the movement of the mechanism during the flipping process, avoids structural interference that may occur between the fan-shaped counterweight 403, the rotating ring 402 and the first lifting bracket 2 at the extreme angle or throughout the entire movement stroke, ensures the smooth realization of the large-angle flipping function, and reflects the rationality and reliability of the structural design.

[0027] like Figure 1 and Figure 2As shown, in this embodiment, an arc-shaped groove 406 is provided on the rotating ring 402, and a limiting pin 407 passes through the first lifting bracket 2 and the arc-shaped groove 406 to limit the rotation range of the rotating ring 402 relative to the first lifting bracket 2. By having the limiting pin 407 pass through the first lifting bracket 2 and be inserted into the arc-shaped groove 406 of the rotating ring 402, a hard limiting mechanism is formed. When the rotating ring 402 rotates, the groove wall of the arc-shaped groove 406 will contact the limiting pin 407, thereby physically preventing the rotating ring 402 from continuing to rotate. This sets a clear and insurmountable rotation angle boundary for the flipping motion, preventing damage to the mechanism due to excessive rotation. The mechanical limiting can effectively prevent the pallet 8 and the workpiece it carries from flipping to a dangerous position outside the design range, avoiding the risk of overload, twisting, or even collision and interference with other parts of the tooling caused by misoperation or control failure, thereby protecting the tooling itself and ensuring the safety of the operator and the workpiece. The limiting mechanism consists only of an arc groove 406 and a limiting pin 407. It does not require complex sensors or electronic control systems, has a simple structure, is easy to process and install, and has extremely low cost, but provides a reliable and effective limiting function.

[0028] like Figure 1As shown, in this embodiment, the first linkage mechanism 5 includes a slider 501 and a first linkage unit 502. The slider 501 is located below the crank-slider mechanism 4 and is slidably sleeved on the outside of the first lifting bracket 2. The first linkage unit 502 is U-shaped. The first end of the first linkage unit 502 is rotatably connected to the end of the crank rod 401 near the tray 8, and the second end of the first linkage unit 502 is rotatably connected to the slider 501. The two sets of first linkage units 502 are arranged symmetrically. The driving and constraint functions are separated. The crank 401, as the main driving element, is responsible for transmitting the rotation of the rotating ring 402 to the tray 8 to achieve flipping. The slider 501, which is slidably sleeved on the outside of the first lifting bracket 2, is combined with the U-shaped first connecting rod unit 502 to form a movable constraint mechanism. Through this constraint mechanism, the flipping is coordinated and guided. During the flipping process of the tray 8, the first connecting rod unit 502 is connected to the crank 401 and the slider 501 at both ends to adapt to and constrain the movement trajectory of the tray 8. At the same time, part of the lateral force generated during the flipping process is transmitted to the first lifting bracket 2, thereby improving the stress state of the crank 401 and its connection point and improving the rigidity and stability of the entire mechanism. The two sets of first linkage units 502 are symmetrically arranged, forming two symmetrical support points on both sides of the tray 8 together with the connection points of the crank rod 401 and the slider 501. This effectively resists the torsion or lateral sway that may occur when the tray 8 is flipped or loaded, ensuring that the tray 8 always moves within the expected plane of motion, greatly enhancing the accuracy and stability of the tooling clamping. The first linkage unit 502 adopts a U-shaped (approximately U-shaped) structure. The U-shaped linkage provides the necessary space for movement avoidance, providing necessary clearance for the crank rod 401, the first lifting bracket 2, or other surrounding components at their extreme movement positions, avoiding movement interference and ensuring the smooth realization of the large-angle flipping function.

[0029] like Figure 1As shown, in this embodiment, the first linkage unit 502 extends axially and forms the first inner support rod 801 of the tray 8. This ingenious design allows the first linkage unit 502 to perform its transmission and constraint functions while extending axially and directly serving as the first inner support rod 801 of the tray 8, simplifying the mechanical structure of the tray 8 area and reducing the number of parts and overall complexity. Since the first linkage unit 502 extends directly as the first inner support rod 801, the supporting force transmitted from the crank-slider mechanism 4 through the first linkage unit 502 can act directly on the tray 8 without intermediate links. This results in a short and efficient force flow path, significantly enhancing the local stiffness and load-bearing capacity of the tray 8, especially its central area, and effectively suppressing the deformation of the tray 8 under load. As a transmission link, the connection between the first link unit 502, the crank rod 401, and the slider 501 requires precise coordination. When the first link unit 502 extends to serve as the first inner support rod 801, it ensures the positioning accuracy of the first inner support rod 801 relative to the tray 8. At the same time, the locking mechanism itself directly fixes the position of the first inner support rod 801, making the support relationship reliable and preventing loosening due to vibration or other reasons.

[0030] like Figure 1 As shown, in this embodiment, the tray 8 is ring-shaped 802, and the tray 8 also includes a second inner support rod 803 arranged perpendicularly and / or obliquely to the first inner support rod 801. The ring-shaped structure of the tray 8 (i.e., hollow ring) provides an unobstructed circumferential working channel for the clamped workpiece (conical thin-walled cylindrical component), allowing operators to perform assembly operations (such as drilling and gluing) on ​​the workpiece from the side or even from below at a certain angle. This effectively solves the problem of solid trays or large-area plate structures obstructing the working space on the side wall of the workpiece, greatly facilitating assembly operations. Inside the ring-shaped tray, the second inner support rod 803, arranged perpendicularly and / or obliquely to the first inner support rod 801, together form a spatial support network. This effectively disperses and transfers the load borne by the ring-shaped tray (mainly the weight of the workpiece and possible operating forces) to the first connecting rod unit 502 (including the first inner support rod 801), which is the main load-bearing structure. This achieves structural lightweighting while ensuring sufficient support rigidity and strength. The first inner support rod 801 (from the first linkage unit 502) mainly provides support along its axial direction, while the second inner support rod 803, which is arranged vertically or at an angle, is mainly used to resist the bending and torsional deformation of the pallet 8 in the annular plane. This multi-directional rod system combination significantly enhances the overall rigidity of the pallet 8, ensuring that it can maintain shape stability when carrying workpieces, and provides a reliable reference plane for high-precision assembly processes.

[0031] like Figure 1As shown, in this embodiment, the locking mechanism 7 uses a locking ring positioned below the slider 501. The locking ring is threaded onto the outside of the first lifting bracket 2. Rotating the locking ring restricts the downward movement of the slider 501, and in conjunction with the tray 8 and the load on the tray 8, locking is achieved. Alternatively, the locking mechanism 7 uses locking rings positioned above and below the slider 501, respectively. The locking rings are threaded onto the outside of the first lifting bracket 2. Rotating both sets of locking rings restricts the axial position of the slider 501, thereby achieving locking. The locking rings are threaded onto the first lifting bracket 2. Utilizing the self-locking characteristic of the threaded pair, they can naturally maintain their position when not subjected to external torsional force, thus reliably locking the slider 501. The supporting or clamping force applied to the slider 501 by rotating the locking rings generates a large frictional force, effectively resisting the possible downward movement or movement of the slider 501 under load, resulting in high locking reliability and load-bearing capacity. A single locking ring design located below slider 501 supports slider 501 from below, preventing it from sliding down. The position above slider 501 is maintained by the weight of tray 8 and the workpiece on it, along with the first linkage mechanism 5. This structure is the simplest and suitable for applications where the main load is downward gravity. A double locking ring design, located above and below slider 501, securely clamps slider 501 in the middle with two locking rings, achieving complete constraint on the axial position of slider 501. This provides higher locking stiffness and safety, effectively resisting forces from different directions (such as upward lifting forces or vibrations generated during assembly). It is suitable for precision assembly applications with complex forces or requiring absolute fixation. The locking mechanism 7 consists only of one or two threaded locking rings, eliminating the need for complex hydraulic, pneumatic, or electric components. Operation is simple, requiring only manual rotation of the locking rings to lock or unlock. It possesses the inherent reliability and durability of mechanical structures and has low manufacturing and maintenance costs.

[0032] like Figure 1 and Figure 3As shown, in this embodiment, the second linkage mechanism 6 includes a first universal joint 601, a cross link 602, a second universal joint 603, and a second link 604. The first universal joint 601 is rotatably mounted on the upper end of the second lifting bracket 3. The first universal joint 601 is rotatably connected to the second universal joint 603 through the cross link 602. The second universal joint 603 is rotatably connected to the first end of the second link 604. The second end of the second link 604 is connected to the tray 8. The connecting body, consisting of the first universal joint 601, the cross link 602, and the second universal joint 603, forms a universal coupling or a universal coupling-like structure, allowing the second link 604 to swing at an angle in multiple directions. When the main tilting structure system (consisting of the first lifting bracket 2, the crank-slider mechanism 4, and the first link mechanism 5) drives the tray 8 to perform complex large-angle tilting, this second link mechanism 6 can adaptively adjust its posture through its multiple rotating joints to accurately compensate for the complex motion trajectory requirements caused by the change in the spatial orientation of the tray 8, thereby ensuring that the movement of the tray 8 is unrestrained and avoiding mechanism jamming or internal stress caused by motion mismatch. Regardless of the orientation of pallet 8, the second linkage mechanism 6 always connects the second lifting bracket 3 and pallet 8, forming a constant auxiliary support chain. This chain partially transfers and distributes the load borne by pallet 8 (especially the force perpendicular to the main plane of the first lifting bracket 2-pallet 8) to the second lifting bracket 3, effectively reducing the stress on the main tilting structure system (especially the hinge point of the rotating ring 402 and crank 401), and enhancing the overall rigidity and stability of the entire fixture during movement and after locking. By adding this auxiliary support path, the eccentric torque that might have been borne by a single-sided support (only the first lifting bracket 2 side) is transformed into a spatial support structure jointly borne by the first lifting bracket 2 and the second lifting bracket 3. This improves the stress state of the main load-bearing components, reduces the deformation risk of critical components, and enables the fixture to bear heavier workpieces and maintain higher positioning accuracy under load, thus ensuring high-precision assembly operations.

[0033] like Figure 1As shown, in this embodiment, the first lifting bracket 2 adopts a first threaded sleeve, and the second lifting bracket 3 adopts a second threaded sleeve; a set of second lifting brackets 3 is provided on each side of the first lifting bracket 2, and the two sets of second lifting brackets 3 are symmetrically arranged relative to the first lifting bracket 2. Optionally, a locking ring 201 is provided at the lower part of the first threaded sleeve and / or the second threaded sleeve; after the height adjustment of the first threaded sleeve and / or the second threaded sleeve is completed, the locking ring 201 is rotated to tighten the threaded outer sleeve, thereby achieving locking. Both the first lifting bracket 2 and the second lifting bracket 3 adopt a threaded sleeve structure, and the height can be smoothly and accurately raised and lowered by rotating the sleeve, so that the overall working height of the pallet 8 and the workpiece (conical cylindrical component) clamped on it can be easily adjusted according to the size of the specific workpiece or the requirements of different assembly positions, greatly enhancing the versatility and adaptability of the tooling. The first lifting bracket 2 is located in the middle, and two sets of second lifting brackets 3 are symmetrically arranged on both sides of it. Together, they form an approximately triangular stable support layout, which can effectively resist overturning moments from all directions (especially those caused by the weight of the workpiece offset on the tray 8 or assembly operation forces). This provides a solid installation foundation for the complex flipping and clamping mechanism above, ensuring the static and dynamic stability of the entire tooling system from the root. By setting a locking ring 201 at the bottom, after the height adjustment is completed, simply rotate the locking ring 201 to tighten it against the threaded sleeve. The friction and thread locking force can reliably lock the threaded sleeve, preventing it from sliding or rotating under load. The structure is simple, the operation is intuitive, the locking force is large, and no additional tools are required, ensuring the stability of the basic support of the tooling in the working state.

[0034] In this embodiment, the first lifting support 2 and / or the second lifting support 3 are jacks or hydraulic cylinders; a set of second lifting supports 3 is provided on each side of the first lifting support 2, and the two sets of second lifting supports 3 are symmetrically arranged relative to the first lifting support 2. Jacks (such as mechanical jacks) or hydraulic cylinders utilize hydraulic or screw-driven force amplification principles to generate a large lifting force with a small input force, allowing the operator to easily adjust the height of the entire pallet 8 bearing heavy workpieces (such as large conical cylindrical components). The adjustment process is more labor-saving, especially under heavy-load conditions, significantly improving operational convenience and ergonomics. Hydraulic cylinders provide smooth, stepless speed control, making the lifting process very smooth and avoiding the jumping or jamming phenomena that may occur in rigid threaded drives. This smoothness helps protect precision workpieces and facilitates precise alignment during adjustment. Some types of jacks or hydraulic cylinders also have high unidirectional positioning accuracy and are less prone to settling after locking. The three-point support layout, with the first lifting support 2 located in the middle and two sets of second lifting supports 3 symmetrically arranged on both sides, ensures that the tooling foundation still has excellent anti-overturning stability and overall rigidity.

[0035] like Figure 1 As shown, in this embodiment, the base 1 adopts a cross rod base or a grid rod base.

[0036] In practice, a clamping fixture for assembling aerospace-grade conical thin-walled cylindrical components is provided. This fixture employs a spatial linkage mechanism composed of a crank-slider (slider 501) and a universal joint (second linkage mechanism 6) to control the rotation of a plane in space from 0° to 180°, thereby meeting the assembly requirements of the conical thin-walled cylindrical components under different working conditions. The fixture consists of three sets of structures: a base 1 and lifting rods (first lifting bracket 2, second lifting bracket 3), a crank-slider (slider 501) and a universal joint (second linkage mechanism 6), and a tray 8 and a clamping ring (clamping mechanism on the tray 8). The base 1 and the support frame (first lifting bracket 2, second lifting bracket 3) support the fixture. The spatial linkage mechanism composed of the crank-slider (slider 501) and the universal joint (second linkage mechanism 6) adjusts the position of the tray 8 and the clamping ring in space. The product is placed on the tray 8 and the clamping ring and clamped securely. This clamping fixture fully considers the operational scenarios of critical processes in the assembly of conical thin-walled cylindrical products, providing a simple clamping method that meets various working conditions, reduces labor intensity, and improves assembly efficiency. Through the ingenious combination of a crank-slider mechanism and a universal joint, the workpiece's posture can be adjusted under multiple working conditions. The clamping fixture switches between different working conditions via the crank rotation of the crank-slider mechanism, and height adjustment is achieved by raising and lowering the threaded tube. The various specifications of clamping rings used for workpiece clamping can adapt to cylindrical workpieces of different diameters, making it suitable for the assembly of cylindrical components in the aerospace manufacturing field, reducing labor intensity and improving operational flexibility and efficiency.

[0037] The specific usage of this tooling is explained in detail according to three working conditions: Working Condition 1: Small Cabin Corner Box Bonding. First, determine the height of the lifting pipe based on the height dimensions of the workpiece and the appropriate operating height for personnel, and then adjust and fix it. The small cabin corner box needs to be placed vertically for assembly. At this time, the crank does not rotate and is in the initial position. When bonding the small end corner box, place the product with the large end facing down and the small end facing up on the tray (the opposite is true when bonding the large end corner box). Take a clamping ring with the same inner diameter as the large end and fit it against the inner diameter of the cylinder. Then fix the clamping ring to the tray, and finally clamp the cylindrical product to the clamping ring.

[0038] Working Condition 2: Bonding of Large Cabin Corner Boxes. Since the large cabin is 1100mm high and the smaller end is relatively small, vertical placement is extremely inconvenient for personnel. Therefore, horizontal placement is required. In this case, the crank needs to be rotated 90° to the vertical direction. Similarly, when bonding the smaller end corner box, place the larger end of the product on the tray (the reverse is true when bonding the larger end corner box). Place a clamping ring with the same inner diameter as the larger end against the inner diameter of the cylinder, then fix the clamping ring to the tray. Finally, clamp the cylindrical product to the clamping ring.

[0039] Scenario 3: Cleaning residual adhesive. Since the residual adhesive is a fluid that flows slowly from top to bottom, cleaning it when the product is placed upright is inconvenient and time-consuming due to limited operating space. Residual adhesive that is not cleaned in time becomes even more difficult to remove once it hardens. Therefore, the cylindrical product needs to be placed upside down or reversed on the tray, with the cylinder at the top and the operator directly below it for easier and faster operation. With the clamped cylinder stationary, three people work together to first adjust the positions of the three lifting tubes to the appropriate height, then slowly rotate the crank to the predetermined position, and finally tighten the internal threaded ring of the slider.

[0040] Any matters not covered in this utility model are common knowledge.

[0041] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

[0043] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An assembly clamping fixture, characterized in that, It includes a base (1), a first lifting bracket (2), a second lifting bracket (3), a crank-slider mechanism (4), a first linkage mechanism (5), a second linkage mechanism (6), a locking mechanism (7), and a tray (8). The first lifting bracket (2) and the second lifting bracket (3) are respectively arranged vertically on the base (1). The tray (8) is connected and movably arranged on the first lifting bracket (2) through the first linkage mechanism (5) and the crank slider mechanism (4) respectively, forming a flipping structure system. The flipping structure system is locked in motion by the locking mechanism (7). The tray (8) is also movably mounted on the second lifting bracket (3) via the second linkage mechanism (6) to assist the flipping structure system in flipping and to provide auxiliary support for the flipping structure system after locking.

2. The assembly clamping fixture according to claim 1, characterized in that, The crank-slider mechanism (4) includes a crank rod (401), a rotating ring (402), and a sector-shaped counterweight (403). The rotating ring (402) is rotatably connected to the top of the first lifting bracket (2), and the rotating shaft (405) is arranged perpendicular to the axis of the first lifting bracket (2). The first end of the crank rod (401) is connected to the rotating ring (402), the second end of the crank rod (401) is connected to the tray (8), the fan-shaped counterweight (403) is arranged on the rotating ring (402) and the fan-shaped counterweight (403) is coaxially arranged with the rotating ring (402), and there is a clearance groove (404) between the fan-shaped counterweight (403) and the rotating ring (402) and / or at the top of the first lifting bracket (2). The integrated mechanism consisting of the fan-shaped counterweight (403) and the rotating ring (402) is arranged with the center of gravity opposite to that of the tray (8).

3. The assembly clamping fixture according to claim 2, characterized in that, An arc-shaped groove (406) is provided on the rotating ring (402), and a limiting pin (407) passes through the first lifting bracket (2) and the arc-shaped groove (406) to limit the rotation range of the rotating ring (402) relative to the first lifting bracket (2).

4. The assembly clamping fixture according to claim 2, characterized in that, The first linkage mechanism (5) includes a slider (501) and a first linkage unit (502). The slider (501) is located below the crank slider mechanism (4) and is slidably sleeved outside the first lifting bracket (2). The first linkage unit (502) is U-shaped. The first end of the first linkage unit (502) is rotatably connected to the end of the crank rod (401) near the tray (8), and the second end of the first linkage unit (502) is rotatably connected to the slider (501). The two sets of first link units (502) are arranged symmetrically.

5. The assembly clamping fixture according to claim 4, characterized in that, The first linkage unit (502) extends axially and forms the first inner support (801) of the tray (8).

6. The assembly clamping fixture according to claim 5, characterized in that, The tray (8) is in the shape of a ring (802), and the tray (8) also includes a second inner support rod (803) that is arranged perpendicularly to and / or obliquely to the first inner support rod (801).

7. The assembly clamping fixture according to claim 6, characterized in that, The locking mechanism (7) uses a locking ring located below the slider (501). The locking ring is threaded onto the outside of the first lifting bracket (2). By rotating the locking ring, the downward movement of the slider (501) is restricted. Combined with the tray (8) and the load on the tray (8), locking is achieved. The locking mechanism (7) uses locking rings arranged above and below the slider (501). The locking rings are threaded to the outside of the first lifting bracket (2). By rotating the two sets of locking rings, the axial position of the slider (501) is restricted, thereby achieving locking.

8. The assembly clamping fixture according to any one of claims 1 to 7, characterized in that, The second linkage (6) includes a first universal joint (601), a cross link (602), a second universal joint (603), and a second link (604). The first universal joint (601) is rotatably mounted on the upper end of the second lifting bracket (3). The first universal joint (601) is rotatably connected to the second universal joint (603) through the cross link (602). The second universal joint (603) is rotatably connected to the first end of the second link (604). The second end of the second link (604) is connected to the tray (8).

9. The assembly clamping fixture according to any one of claims 1 to 7, characterized in that, The first lifting support (2) adopts the first threaded sleeve, and the second lifting support (3) adopts the second threaded sleeve; A set of second lifting supports (3) is provided on each side of the first lifting support (2), and the two sets of second lifting supports (3) are arranged symmetrically relative to the first lifting support (2).

10. The assembly clamping fixture according to any one of claims 1 to 7, characterized in that, The base (1) adopts a cross rod base or a grid rod base.

Images