A supporting tool for V2500 inlet passage steel mesh replacement

Abstract

The utility model discloses a special support frock for V2500 inlet passage sound-absorbing board steel net replacement, which is composed of four parts of a base frame, a branch support system, a rotary actuating mechanism and a moving locking device. The base frame adopts a hollow rectangular steel tube welding structure in the middle part, and universal wheels with brakes are installed at four corners. The branch support system is composed of four arc-shaped support arms accurately shaped according to 3D scanning data, and forms surface contact lifting for the lower semicircular area of the inlet passage sound-absorbing board. The rotary actuating mechanism is provided with a load-bearing roller at the top end of each support arm, and the roller realizes height fine adjustment through a hydraulic support rod, so that the sound-absorbing board can be smoothly rotated by 360 degrees under the external force. The moving locking device realizes flexible transfer and rapid positioning in the workshop through the universal wheels. The utility model realizes the integration of three functions of support, rotation and movement at one time, significantly improves the efficiency of steel net paving, reduces the labor intensity and the risk of part damage, and has good universality and promotion prospect.

Description

Technical Field

[0001] This utility model relates to the technical field of support tooling for V2500 intake manifold steel mesh replacement, and in particular to a support tooling for V2500 intake manifold steel mesh replacement. Background Technology

[0002] The V2500 engine's intake muffler has a carbon fiber sandwich structure. Replacing the steel mesh requires placing the entire muffler perpendicular to the ground and repeatedly rotating it at different angles to complete multiple steps, including sanding, removing adhesive, applying primer, and re-attaching the steel mesh. Current technology commonly uses a temporary solution of a U-shaped trolley and wooden stool.

[0003] The sound-absorbing panels need to be manually flipped, which is cumbersome and inefficient.

[0004] The sound-absorbing plate is not perfectly circular, requiring frequent adjustments to the unfolded length of the trolley, resulting in poor positioning accuracy.

[0005] The wooden pads make point-to-line contact with the parts, which can easily damage the carbon fiber surface.

[0006] It lacks a dedicated rotating mechanism, posing a risk of falling and resulting in poor safety.

[0007] Multiple sets of temporary auxiliary equipment are mixed together, resulting in high management costs and inefficient logistics in the workshop.

[0008] Therefore, there is an urgent need for a special tooling that is simple in structure, reliable in positioning, rotatable and does not damage parts, in order to solve the problems of low efficiency, poor safety and easy damage to parts in the existing technology. Utility Model Content

[0009] The purpose of this invention is to provide a support fixture for replacing the steel mesh in the intake duct of a V2500 engine, thereby solving the aforementioned problems in the prior art.

[0010] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0011] A support fixture for replacing the steel mesh in the intake duct of a V2500 engine includes four main parts: a base frame, a branch support system, a rotary actuator, and a movable locking device.

[0012] The base frame is a hollow rectangular frame with a central hollow section, which is welded from rectangular steel pipes. The four corners of its lower surface are fixed with universal wheels with braking function to form a movement locking device.

[0013] The branch support system includes four arc-shaped support arms and two support seats. The support seats are symmetrically arranged along the longitudinal center line of the base frame and welded to the upper surface of the base frame. The four arc-shaped support arms are set in pairs at the ends of the support seats away from the base frame, forming a support for the lower semi-circular area of ​​the intake muffler.

[0014] The rotary actuator includes a load-bearing roller fixed at the top of each support arm and a hydraulic support rod that drives the load-bearing roller to rise and fall. The housing of the hydraulic support rod is fixed to the support base, and the piston rod is fixed to the load-bearing roller bracket, so that the load-bearing roller can move slightly in the vertical direction.

[0015] The intake muffler is placed on four sets of load-bearing rollers and can rotate 360° around its own axis with the support of the load-bearing rollers.

[0016] In some specific embodiments, the rectangular steel tubes of the base frame are hollow square tubes with a uniform cross-section. The ends of each tube are closed by butt welds to form a closed rectangular outer frame and a central cross reinforcing beam. The hollow area in the middle of the frame provides operating space for maintenance personnel.

[0017] In some specific embodiments, the curvature of the surface of each arc-shaped support arm is consistent with the curvature of the outer surface of the lower semicircle of the intake muffler obtained by 3D scanning, so that the inner arc surface of the support arm forms a surface contact with the outer wall of the muffler.

[0018] In some specific embodiments, an anti-pressure and anti-slip rubber pad is attached to the entire inner arc surface of the support arm. The rubber pad has a uniform thickness and a grid-like anti-slip texture on its outer surface, which is used to increase the contact area with the intake muffler plate and prevent scratches on the carbon fiber surface.

[0019] In some specific embodiments, the load-bearing roller is a nylon or polyurethane integral casting wheel, and the outer circular surface of the wheel is concave arc-shaped. This arc shape matches the curvature of the outer wall of the air intake muffler plate, forming a line-surface fitting rolling pair.

[0020] In some specific embodiments,

[0021] The hydraulic support rod and the load-bearing roller together form a roller mechanism. This mechanism is arranged tangentially at the top of the support arm so that the rotation axis of the roller is parallel to the tangent of the outer circle of the intake muffler plate, so as to ensure that there is no jamming during the rolling process.

[0022] In some specific embodiments, the casters with brakes are detachably fixed to the flange plates on the lower surface of the four corners of the base frame via bolt assemblies. The casters are unlocked when the brake pedal is lifted upwards and locked when it is pressed downwards, thus enabling the tooling to switch between two states: overall movement or fixation.

[0023] In some specific embodiments, the universal wheels fixed at the four corners of the base frame are all of the same specification and have the same diameter, so that the upper surface of the base frame remains horizontal and the four sets of load-bearing rollers are coplanar, thereby making the axis of the air intake muffler perpendicular to the ground.

[0024] In some specific embodiments, the four support arms of the branch support system are arranged symmetrically in an "X" shape on the upper surface of the base frame, and their lower ends are welded to the upper surface of the base frame with continuous fillet welds. The weld length is not less than 1.5 times the perimeter of the support arm section to ensure support rigidity.

[0025] In some specific embodiments, all metal components are coated with oil-resistant and rust-proof primer and topcoat. Non-metallic parts, namely the pressure-resistant and anti-slip rubber pads and load-bearing rollers, are free of silicone components in contact with the air intake muffler, thus meeting the requirements for silicone-free aircraft maintenance workshops.

[0026] The beneficial effects of this utility model are:

[0027] Compared with the prior art, the present invention has the following significant advantages:

[0028] Improved operational efficiency: The rotating actuator with its own roller mechanism eliminates the need for manual flipping and repeated clamping, allowing the steel mesh to be laid in one go, reducing the operation time by more than 50%.

[0029] High safety: Four sets of arc-shaped support arms form a large area of ​​soft contact with the pressure-resistant and anti-slip rubber pads, which, together with the hydraulic support rods, completely eliminates the risk of parts slipping or surface damage.

[0030] Ergonomic optimization: The hollowed-out base frame in the middle provides ample operating space for maintenance personnel, reducing the number of times they have to bend over and lowering labor intensity.

[0031] Cost reduction: The integrated design replaces various temporary aids such as U-shaped trolleys and wooden stools, reducing equipment investment and management costs.

[0032] High versatility: The curved surface of the support arm is customized based on 3D scanning data, which can be quickly adapted to different models of air intake mufflers and has good expansion potential.

[0033] High degree of functional integration: It integrates support, rotation, and movement, simplifying the process flow and improving workshop logistics efficiency. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of a support fixture structure for replacing the steel mesh in the intake duct of a V2500 engine, according to this utility model.

[0035] In the attached diagram: 1. Intake duct muffler; 2. Support arm; 3. Support base; 4. Base frame; 5. Casters; 6. Load-bearing rollers; 7. Hydraulic support rod. Detailed Implementation

[0036] To make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model is further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not intended to limit the present utility model.

[0037] With reference to Figure 1 the shown support tooling for replacing the steel mesh of the V2500 air inlet duct, which comprises four major parts: a base frame, a branch support system, a rotation actuator and a movement locking device;

[0038] The base frame is a rectangular frame with a hollowed-out middle part welded by rectangular steel pipes, and four corners of the lower surface thereof are fixedly connected with universal wheels 5 with a braking function to form the movement locking device;

[0039] The branch support system comprises four arc-shaped support arms 2 and two support seats 3. The support seats 3 are symmetrically arranged along the longitudinal center line of the base frame 4 and welded and fixed on the upper surface of the base frame 4; the four arc-shaped support arms 2 are arranged in pairs at the end of the support seats 3 away from the base frame 4, so as to form a support for the lower semicircular area of the air inlet duct sound attenuation panel 1;

[0040] The rotation actuator comprises a load-bearing roller 6 fixedly arranged at the top end of each support arm 2 and a hydraulic support rod 7 for driving the load-bearing roller 6 to ascend and descend. The shell of the hydraulic support rod is fixedly connected with the support seat 3, and the piston rod is fixedly connected with the bracket of the load-bearing roller 6, so that the load-bearing roller 6 can perform micro-motion in the vertical direction;

[0041] The air inlet duct sound attenuation panel 1 is placed on the four sets of load-bearing rollers 6, and can rotate 360° around its own axis under the support of the load-bearing rollers 6.

[0042] In this embodiment, as shown in Figure 1 the overall structure of the present application is formed by the cooperation of four major parts: the base frame, the branch support system, the rotation actuator and the movement locking device. The base frame 4 is formed by splicing and welding rectangular hollow steel pipes into a "Japanese character"-shaped structure with a hollowed-out middle part. A universal wheel 5 with a brake pedal is fixedly connected to the lower surface of each of the four corners through a flange plate 12 to form the movement locking device; when the brake pedal is lifted upwards, the universal wheels 5 are unlocked, the tooling can be pushed in any direction on the workshop floor, and when the pedal is pressed down, the wheel brakes are locked, the tooling is positioned instantly, realizing "movable to push, stable to stop".

[0043] The branch support system consists of two support seats 3 symmetrically arranged along the longitudinal centerline of the base frame 4 and four arc-shaped support arms 2. The support seats 3 are welded to the upper surface of the base frame 4 with continuous fillet welds, and the weld length is not less than 1.5 times the perimeter of the cross-section of the support arm 2 to ensure high rigidity. The four support arms 2 extend outward in an "X" shape, with their lower ends welded to the top of the support seats 3 and their upper ends bent inward to form an arc surface with the same curvature as the lower semicircle of the V2500 air intake muffler plate 1. The entire arc surface is covered with a uniform thickness of pressure-resistant and anti-slip rubber pad with a grid anti-slip texture, so that the support arms 2 and the muffler plate 1 form a large area of ​​flexible surface contact, which not only disperses pressure but also prevents scratches on the carbon fiber composite surface.

[0044] The rotary actuator is located at the top of each support arm 2: the load-bearing roller 6 is integrally cast from nylon or polyurethane, with an inner concave arc groove on its outer circumference that matches the curvature of the outer wall of the sound-absorbing plate 1, forming a line-surface contact rolling pair; the rear of the roller bracket is fixedly connected to the piston rod of the hydraulic support rod 7, and the housing of the hydraulic support rod 7 is fixedly connected to the side plate of the support base 3. Through the slight extension and retraction of the hydraulic support rod 7, the load-bearing roller 6 can achieve precise lifting and lowering of ±5 mm in the vertical direction, thereby compensating for the height difference caused by the ellipticity of the parts and uneven ground, ensuring that the four sets of rollers are always coplanar.

[0045] The dynamic working process is as follows: Before replacing the steel mesh, push the tooling to the work area and press down the universal wheel 5 to lock it. Use an overhead crane or lifting platform to hoist the air intake muffler 1 between the four support arms 2, so that its lower outer edge falls into the concave arc groove of the four load-bearing rollers 6. At this time, the hydraulic support rod 7 is in the middle position, and the rollers are linearly attached to the outer wall of the muffler 1. The maintenance personnel stand in the hollow area in the middle of the base frame 4 and can perform operations such as grinding, removing glue, and spraying primer on the lower half of the muffler 1 without bending over. After completing the work at the current angle, simply push the outer wall of the muffler 1 with your hand, and the muffler 1 will rotate 360° continuously, smoothly, and with low damping on its own axis on the load-bearing rollers 6. It can stop at any angle, realizing "repair while rotating". During the rotation, the hydraulic support rod 7 adaptively moves in real time to eliminate the jump caused by the ellipticity of the parts and prevent jamming. The anti-slip rubber pad and the concave arc groove of the roller together provide radial limit to prevent the muffler 1 from slipping laterally. After the entire steel mesh is laid, the casters 5 are unlocked, and the tooling and soundproof plate 1 can be pushed directly to the next work station or storage area, realizing "one-time clamping and full-process circulation".

[0046] This tooling integrates support, rotation, and movement functions in one go through a triple synergy of "branch-like" flexible arc lifting, roller-hydraulic adaptive support, and one-button movement / locking of omnidirectional wheels. It significantly reduces labor intensity, eliminates the risk of parts falling and surface damage, improves steel mesh replacement efficiency by more than 50%, and has good potential for model expansion.

[0047] In some specific embodiments, the rectangular steel tubes of the base frame 4 are hollow square tubes with a uniform cross section. The ends of each tube are closed by butt welds to form a closed rectangular outer frame and a central cross reinforcing beam. The hollow area in the middle of the whole provides bottom operating space for maintenance personnel.

[0048] In some specific embodiments, the curvature of the surface of each arc-shaped support arm 2 is consistent with the curvature of the lower semicircular outer surface of the intake muffler plate 1 obtained by 3D scanning, so that the inner arc surface of the support arm 2 forms a surface contact with the outer wall of the muffler plate 1.

[0049] In some specific embodiments, the entire inner arc surface of the support arm 2 is covered with a pressure-resistant and anti-slip rubber pad. The rubber pad has a uniform thickness and a grid-like anti-slip texture on its outer surface, which is used to increase the contact area with the intake duct muffler 1 and prevent scratches on the carbon fiber surface.

[0050] In some specific embodiments, the load-bearing roller 6 is a nylon or polyurethane integral cast wheel, and the outer circular surface of the wheel is concave arc-shaped. This arc shape matches the curvature of the outer wall of the air intake muffler plate 1, forming a line-surface fitting rolling pair.

[0051] In some specific embodiments, the hydraulic support rod and the load-bearing roller 6 together form a roller mechanism. This mechanism is arranged tangentially at the top of the support arm 2 so that the rotation axis of the roller is parallel to the tangent of the outer circle of the air intake muffler plate 1, so as to ensure that there is no jamming during the rolling process.

[0052] In some specific embodiments, the universal wheel 5 with braking function is detachably fixed to the flange plate 12 on the lower surface of the four corners of the base frame 4 by bolt assembly. When the brake pedal of the universal wheel 5 is lifted upward, it is unlocked, and when it is pressed downward, it is locked, realizing the switching between the two states of the tooling as a whole moving or fixed.

[0053] In some specific embodiments, the universal wheels 5 fixed to the four corners of the base frame 4 are all of the same specification and have the same wheel diameter, so that the upper surface of the base frame 4 remains horizontal and the four sets of load-bearing rollers 6 are coplanar, thereby making the axis of the air intake muffler plate 1 perpendicular to the ground.

[0054] In some specific embodiments, the four support arms 2 of the branch support system are arranged symmetrically in an "X" shape on the upper surface of the base frame 4, and their lower ends are welded to the upper surface of the base frame 4 with continuous fillet welds. The weld length is not less than 1.5 times the perimeter of the cross section of the support arm 2 to ensure support rigidity.

[0055] In some specific embodiments, all metal components are coated with oil-resistant and rust-proof primer and topcoat. Non-metallic parts, namely the pressure-resistant and anti-slip rubber pads and the contact parts of the load-bearing rollers 6 and the air intake muffler 1, do not contain silicone components, thus meeting the requirements of no silicone pollution in aircraft maintenance workshops.

[0056] In the above embodiment, the base frame 4 is selected as a hollow square steel pipe with a consistent cross-section, the ends of the four outer frame pipes are sealed in the form of butt welds, and a cross reinforcing beam is welded in the middle to form a "日"-shaped central hollow structure. The closed outer frame cooperates with the cross beam, which not only ensures the overall torsional rigidity, but also leaves sufficient bottom operation space for maintenance personnel. Personnel can stand or half-squat in the hollow area to grind, remove glue, and lay the steel mesh on the lower semicircle of the air inlet silencing plate 1, without repeated bending over, significantly reducing labor intensity.

[0057] The curvature of the curved surfaces of the four arc-shaped support arms 2 is precisely lofted based on the point cloud data of the outer surface of the lower semicircle of the air inlet silencing plate 1 obtained by 3D scanning, ensuring that the inner arc surface of the support arm 2 is in full arc segment surface contact with the outer wall of the silencing plate 1. The contact area is more than three times higher than that of the traditional wooden cushion block, the pressure per unit area is significantly reduced, and the risk of local indentation is completely eliminated.

[0058] A pressure-resistant and non-slip rubber pad with uniform thickness is pasted on the entire inner arc surface of the support arm 2, and the outer surface of the rubber pad is molded into a grid-shaped non-slip pattern. The compression rebound rate of the rubber pad is ≥40%, which can absorb the micro-vibration generated when the tooling moves or rotates, and at the same time increase the friction coefficient to more than 0.6 to prevent the silencing plate 1 from circumferential slippage during rotation; the rubber hardness is Shore A 65, no silicone is contained, which avoids chemical pollution or scratches to the carbon fiber composite material.

[0059] The load-bearing roller 6 is integrally cast from nylon or polyurethane, and the outer circle of the roller body is provided with an inwardly concave arc-shaped groove consistent with the curvature of the outer wall of the air inlet silencing plate 1, the groove depth is about 1 / 3 of the roller width, forming a continuous line-surface fit rolling pair. The concave arc groove is automatically centered during rotation to eliminate axial play; the nylon / polyurethane material is self-lubricating, and the rolling friction coefficient is ≤0.05, ensuring smooth 360° rotation without noise.

[0060] The hydraulic support rod 7 and the load-bearing roller 6 form a tangentially arranged roller mechanism: the shell of the hydraulic support rod 7 is fixedly connected to the side plate of the support base 3, and the piston rod is hinged with the roller bracket, so that the rotation axis of the roller is always parallel to the tangent of the outer circle of the silencing plate 1. When there is ellipticity in the silencing plate 1 or the ground is slightly uneven, the hydraulic support rod 7 can extend and retract by ±5 mm in real time to automatically compensate for the height difference, ensuring that the four rollers bear the load at the same time without jamming or jumping.

[0061] The universal wheel 5 with braking function is detachably connected to the flange plates 12 on the lower surface of the four corners of the base frame 4 through bolt assemblies, the wheel frame can rotate 360° horizontally, and the wheel diameters are consistent. When the brake pedal is lifted upward, the roller rotates freely, and the tooling can be pushed in any direction in the workshop; when the pedal is pressed down, the built-in brake pad locks the wheel surface, realizing fast switching of "stop immediately when walking", and the repeated positioning accuracy is ≤1mm.

[0062] The four casters 5 are of the same specification and have the same diameter, so that the upper surface of the base frame 4 is naturally kept horizontal, thereby ensuring that the four sets of load-bearing rollers 6 are coplanar. The axis of the air intake muffler 1 is perpendicular to the ground, eliminating the additional bending moment caused by the tilt of the base and ensuring a smooth rotation process.

[0063] The four support arms 2 of the branch support system are arranged symmetrically in an "X" shape on the upper surface of the base frame 4. The lower end of the support arms is welded to the upper surface of the frame with a continuous fillet weld. The weld length is not less than 1.5 times the perimeter of the square tube section of the support arm 2, and the weld leg height is 6mm, forming a closed triangular force transmission path, which significantly improves the lateral stiffness and torsional resistance. It can withstand a maximum tangential inertial force of 150kg without plastic deformation at the moment of rotation and start-stop of the soundproof plate 1.

[0064] All metal components are coated with oil-resistant and rust-proof primer and polyurethane topcoat according to aircraft maintenance workshop standards, with a total dry film thickness ≥120μm and salt spray resistance ≥1000h; non-metallic parts—pressure-resistant and anti-slip rubber pads and load-bearing rollers 6—all raw materials have passed silicone-free testing, with silicone content <5ppm, meeting the stringent requirements of the aircraft maintenance area for silicone-free contamination, and avoiding potential quality problems such as "fish eyes" or delamination when bonding steel mesh later.

[0065] Dynamic working process: When replacing the steel mesh, first unlock the casters 5 and push the tool to the working position, then press down the pedal to lock it; the overhead crane hoists the intake duct muffler 1 between the four support arms 2, and the lower edge of the outer circle of the muffler 1 automatically aligns and fits with the concave arc groove of the load-bearing roller 6; the hydraulic support rod 7 provides real-time micro-motion compensation, making the four sets of rollers coplanar and the axis of the muffler 1 vertical. The maintenance personnel stand in the hollow area in the middle of the base frame 4 and grind, remove glue, and spray primer on the lower half of the muffler 1; after completing the current angle, gently push the muffler 1, and it will rotate continuously and smoothly 360° around its own axis on the roller, stopping at any angle, realizing "repair while rotating". After the entire steel mesh is laid, the casters 5 are unlocked, and the tooling and soundproofing plate 1 are pushed to the next work station as a whole. No secondary hoisting or re-clamping is required throughout the process, reducing the operation time by more than 50%. The parts have zero pressure damage and zero slippage, completely solving the problems of low efficiency, high risk and easy damage to carbon fiber caused by the traditional temporary wooden stool solution.

[0066] Working principle

[0067] This utility model integrates four levels of functions—"flexible arc lifting—roller support—hydraulic self-adaptation—universal wheel movement / locking"—into a single tooling, forming a continuous, closed-loop steel mesh replacement process chain:

[0068] Flexible Arc Support: The four arc-shaped support arms 2, precisely bent according to 3D scanning data, have the same curvature as the outer surface of the lower semicircle of the air intake muffler plate 1. The inner arc is covered with a silicone-free anti-slip rubber pad, achieving a large area of ​​flexible surface contact, transforming the concentrated load into a uniformly distributed load, and avoiding damage to the composite material.

[0069] Roller support: Each support arm 2 is equipped with a concave arc groove load-bearing roller 6 at its top. The four sets of rollers together form a rotatable "virtual circular track"; the outer circle of the sound-absorbing plate 1 falls into the concave arc groove, forming a line-surface contact rolling pair, which can be started and stopped at any angle.

[0070] Hydraulic self-adaptation: The hydraulic support rod 7 extends and retracts in real time by ±5mm, automatically compensating for the ellipticity of parts and unevenness of the ground, ensuring that the four rollers are always coplanar, and there is no jamming or jumping during the rotation process.

[0071] Movement / Locking: The braked swivel casters 5 can be lifted to unlock, allowing the tool to be pushed horizontally 360°; pressing down the pedal locks the tool, with a repeatability accuracy of ≤1mm, enabling one-button switching between "push-stop-maintenance".

[0072] During the operation, the maintenance personnel stand in the hollow area in the middle of the base frame 4, first grind, remove glue and spray base glue on the lower half circle of the sound-absorbing plate 1, and then gently push the part. The sound-absorbing plate 1 rotates continuously 360° around its own axis on the roller. The personnel can lay the steel mesh section by section while maintaining a standing posture. After the whole circle is completed, it can be directly pushed to the next work station. There is no need for secondary hoisting, flipping or re-clamping throughout the process.

[0073] By adopting the above-disclosed technical solution of this utility model, the following beneficial effects are obtained:

[0074] Efficiency increased by more than 50%: It eliminates the time spent on repeatedly moving wooden stools, manually flipping them, and clamping them multiple times, and the steel mesh laying is completed in one go.

[0075] Zero pressure damage, zero slippage: The combined action of flexible curved surface contact, anti-slip rubber pad, and concave curved roller reduces the pressure per unit area by 70%, completely eliminating pits, scratches, and slippage risks on the composite material surface.

[0076] Labor intensity is greatly reduced: the hollow frame in the middle provides foot space for operation, allowing personnel to work upright and reducing the number of times they bend over by 80%.

[0077] Adaptive and adjustment-free: The hydraulic support rod compensates for ellipticity in real time, eliminating the need for shim adjustments; the parts can be used immediately after hoisting in.

[0078] One-click movement / locking: Four identical casters ensure the base remains level, allowing for easy movement, precise positioning, and smooth logistics in the workshop.

[0079] Silicone-free: All non-metallic parts that come into contact with the components are free of silicone, meeting the most stringent material compatibility requirements for aircraft maintenance workshops.

[0080] High versatility and expandability: The curved surface of the support arm is customized by 3D scanning, which can quickly match the intake muffler plates of different diameters and models. There is no need to scrap the whole thing, only the arm body needs to be replaced for upgrading.

[0081] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A support fixture for replacing the steel mesh in the intake duct of a V2500 engine, characterized in that: It consists of four main parts: base frame, branch support system, rotary actuator and moving locking device; The base frame is a rectangular frame with a hollowed-out center, which is welded from rectangular steel pipes. The four corners of its lower surface are fixed with universal wheels with braking function (5) to form a moving locking device. The branch support system includes four arc-shaped support arms (2) and two support seats (3). The support seats (3) are symmetrically arranged along the longitudinal center line of the base frame (4) and welded to the upper surface of the base frame (4). The four arc-shaped support arms (2) are arranged in pairs at one end of the support seat (3) away from the base frame (4), forming a support for the lower semi-circular area of ​​the intake duct muffler plate (1). The rotary actuator includes a load-bearing roller (6) fixed at the top of each support arm (2) and a hydraulic support rod (7) that drives the load-bearing roller (6) to rise and fall. The housing of the hydraulic support rod is fixedly connected to the support seat (3), and the piston rod is fixedly connected to the support bracket of the load-bearing roller (6), so that the load-bearing roller (6) can move slightly in the vertical direction. The intake muffler (1) is placed on four sets of load-bearing rollers (6) and can rotate 360° around its own axis under the support of the load-bearing rollers (6).

2. The support fixture according to claim 1, characterized in that: The rectangular steel tube of the base frame (4) is a hollow square tube with a consistent cross section. The ends of each tube are closed by butt welds to form a closed rectangular outer frame and a cross reinforcing beam in the middle. The hollow area in the middle of the whole provides the bottom operating space for maintenance personnel.

3. The supporting fixture according to claim 1, characterized in that: The curvature of each arc-shaped support arm (2) is consistent with the curvature of the lower semicircular outer surface of the intake muffler plate (1) obtained by 3D scanning, so that the inner arc surface of the support arm (2) and the outer wall of the muffler plate (1) form a surface contact.

4. The supporting fixture according to claim 3, characterized in that: The inner arc surface of the support arm (2) is covered with a pressure-resistant and anti-slip rubber pad. The rubber pad has a uniform thickness and a grid-like anti-slip texture on the outer surface. This is used to increase the contact area with the intake muffler plate (1) and prevent scratching the carbon fiber surface.

5. The support fixture according to claim 1, characterized in that: The load-bearing roller (6) is a nylon or polyurethane integral casting wheel. The outer circular surface of the wheel is concave arc-shaped. This arc shape matches the curvature of the outer wall of the air intake muffler plate (1) to form a line-surface fitting rolling pair.

6. The supporting fixture according to claim 1, characterized in that: The hydraulic support rod and the load-bearing roller (6) together form a roller mechanism. This mechanism is arranged tangentially at the top of the support arm (2) so that the rotation axis of the roller is parallel to the outer circle tangent of the intake duct muffler plate (1) to ensure that there is no jamming during the rolling process.

7. The support fixture according to claim 1, characterized in that: The universal wheel (5) with brake function is detachably fixed to the flange plate on the lower surface of the four corners of the base frame (4) by bolt assembly. The universal wheel (5) is unlocked when the brake pedal is lifted up and locked when it is pressed down, realizing the switching between the two states of the tooling being moved or fixed.

8. The support fixture according to claim 1, characterized in that: The casters (5) fixed at the four corners of the base frame (4) are all of the same specification and have the same wheel diameter, so that the upper surface of the base frame (4) remains horizontal and the four sets of load-bearing rollers (6) are coplanar, thereby making the axis of the intake duct muffler (1) perpendicular to the ground.

9. The support fixture according to claim 1, characterized in that: The four support arms (2) of the branch support system are arranged symmetrically in an "X" shape on the upper surface of the base frame (4). Their lower ends are welded to the upper surface of the base frame (4) with continuous fillet welds. The weld length is not less than 1.5 times the perimeter of the support arm (2) section to ensure support rigidity.

10. The support fixture according to any one of claims 1-9, characterized in that: All metal components are coated with oil-resistant and rust-proof primer and topcoat. Non-metallic parts, namely the pressure-resistant and anti-slip rubber pads and load-bearing rollers (6) and the air intake muffler (1), do not contain silicone components, which meets the requirements of no silicone pollution in the aircraft maintenance workshop.

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