Large passenger aircraft rivet repair jig

Abstract

A large passenger plane reaming jig belongs to the technical field of large passenger plane component assembly. The reaming jig structure is that the fixed frame bottom is fixedly connected with a plurality of adjustable feet arranged symmetrically, the fixed frame is divided into a plurality of frame units through a plurality of middle frames, a lifting platform is arranged in each frame unit, the control system of each lifting platform is integrated on a PLC, and each lifting platform is signal-connected with the PLC through the control system to realize individual control; the lifting platform can move up and down along a plurality of slide rails, the plurality of slide rails are symmetrically arranged relative to the lifting platform and fixed in the fixed frame; one positioning assembly is fixed on the front and rear sides of each frame unit respectively, one step ladder is fixed on the left and right ends of the fixed frame respectively, and the upper end of the step ladder and the upper end of the fixed frame are provided with entrances and exits corresponding to each other. The utility model is used for large passenger plane reaming operation, and can significantly improve the rapidity and accessibility of reaming operation.

Description

Technical Field

[0001] This utility model belongs to the field of large passenger aircraft component assembly technology, specifically relating to a large passenger aircraft riveting bracket. Background Technology

[0002] Traditional aircraft riveting fixtures have many problems. On the one hand, their positioning is affected by the fuselage height and large curvature shape, resulting in high operational intensity, low efficiency, and inability to achieve multi-area collaborative work, posing many safety hazards. On the other hand, traditional riveting fixtures require manual access via internal ladders to reach different working positions at different heights, resulting in poor accessibility, worker fatigue, and wasted time, thus reducing the efficiency of riveting work. Summary of the Invention

[0003] The purpose of this utility model is to provide a large passenger aircraft riveting bracket to solve the above-mentioned problems existing in the prior art.

[0004] For large passenger aircraft, this utility model develops an electrically controlled automated riveting frame: using PLC control and a servo-sensor integrated system (including servo motors, limit sensors, etc.), the PLC realizes individual control of each lifting platform, thereby enabling independent lifting operations, good accessibility, easy operation, and can be stopped anywhere, thus replacing manual labor, significantly reducing labor intensity and operational difficulty, and achieving efficient, safe, and convenient riveting operations.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A large passenger aircraft riveting frame includes a fixed frame, multiple lifting platforms, multiple positioning components, two staircases, multiple slide rails, and multiple adjustable feet. The bottom of the fixed frame is fixedly connected to the multiple symmetrically arranged adjustable feet. The fixed frame is divided into multiple frame units by multiple intermediate frames. Each frame unit is equipped with a lifting platform. The control system of each lifting platform is integrated into a PLC, and each lifting platform is connected to the PLC signal through its control system to achieve individual control. The lifting platform can move up and down along the multiple slide rails, which are symmetrically arranged relative to the lifting platform and fixed within the fixed frame. A positioning component is fixed on the front and rear sides of each frame unit, and a staircase is fixed on the left and right ends of the fixed frame. Entrances and exits to the fixed frame are provided at the top of the staircases and corresponding positions on the top of the fixed frame.

[0006] Furthermore, each of the positioning components includes a clamping plate, multiple ear-shaped connectors, multiple connecting seats, multiple support seats, multiple support frames, and at least one tensioning strap; multiple connecting seats are fixed on the clamping plate, and the upper and lower ends of the clamping plate are respectively fixed to the fixed frame through the connecting seats; multiple ear-shaped connectors are respectively fixed to the clamping plate through their respective corresponding connecting seats, the support seats are connected to the support frames, the support frames are fixed to the fixed frame, and all the tensioning straps are connected to the clamping plate.

[0007] Furthermore, each of the aforementioned lifting platforms includes a lifting platform frame, a lifting source mechanism, a telescopic pedal, a transmission mechanism, and a lifting handle; the lifting source mechanism is fixed on the fixed frame and is connected to the PLC signal; the transmission mechanism is fixed inside the lifting platform frame; the handle shaft of the lifting handle is connected to the reducer of the transmission mechanism; the telescopic pedal is fixed on the transmission mechanism; the forward and backward telescopic function is realized through the drive of the transmission mechanism; and the lifting platform frame is raised and lowered by controlling the lifting source mechanism through the PLC.

[0008] Furthermore, the lifting mechanism includes a motor, a reducer, two couplings, two transmission rods, two bases, two lead screws, and two transmission shafts. The motor is fixed on the fixed frame, and the output shaft of the motor is connected to the input shaft of the reducer. The two output shafts of the reducer are respectively connected to one end of the corresponding transmission rod through couplings. The other end of the transmission rod is fixedly connected to the center hole of the driving bevel gear in the base. The lower end of the transmission shaft is fixedly connected to the center hole of the driven bevel gear in the base. The driving bevel gear and the driven bevel gear mesh with each other. The upper end of the transmission shaft is coaxially integrated with the lead screw. The lead screw is screwed into a lead screw nut, and the lead screw nut is fixed to the bottom of the lifting platform frame.

[0009] Furthermore, the transmission mechanism includes two drive wheels, two driven wheels, bearing seats, two brackets, two pressure plates, two synchronous belts, two couplings, a reducer, and four housings. The bearing seats are pre-fitted to the input shaft of the reducer. The output shaft of the reducer is connected to the axle of its corresponding drive wheel via couplings. The drive wheels are connected to the driven wheels via synchronous belts. The two synchronous belts are arranged side by side in the front-rear direction, and a pressure plate is fixed on the upper surface of each synchronous belt. The two drive wheels and two driven wheels are respectively installed in their respective housings. The axles of the drive wheels and driven wheels are rotatably connected to their respective housings. A bracket is fixed to the outer wall of the housing containing the drive wheels. The bearing seats, brackets, and housings are all fixedly connected to the inside of the lifting platform frame. The input shaft of reducer 2 is connected to the handle shaft of the lifting handle; the telescopic pedal is fixed on two pressure plates and is located inside the lifting platform frame.

[0010] Furthermore, the telescopic pedal includes a pedal frame, a patterned aluminum plate, and anti-collision rubber strips; the patterned aluminum plate is riveted to the upper end face of the pedal frame, and the periphery of the patterned aluminum plate is riveted to the anti-collision rubber strips.

[0011] Furthermore, the frame of the staircase is welded from square steel, a platform is provided at the top of the staircase, and multiple swivel casters are installed at the bottom of the staircase.

[0012] Furthermore, the riveting frame also includes multiple guardrails; guardrails are fixedly installed on both the front and rear sides of each frame unit.

[0013] Furthermore, a limit sensor is installed on the fixed frame. The limit sensor is located below the lifting platform and is connected to the PLC signal.

[0014] The advantages of this utility model over the prior art are: the riveting frame of this utility model is designed specifically for large passenger aircraft, which can significantly improve the speed and accessibility of riveting operations; its assembly precision is high and its structural integrity is good, ensuring stability and reliability throughout the process.

[0015] The structural features of this utility model's riveting frame are: 1. The positioning component can be connected to the positioning of multiple models of the same product, making it more versatile; 2. The main body of the fixed frame is made of square steel welded together and painted on the surface, which increases the service life of the fixed frame; 3. The positioning components in contact with the product should preferably be made of aluminum to prevent scratches on the product; 4. It has a clear positioning method. The internal support is provided by the clamp plate, and the product is positioned by the ear plate connector. Then, the product is tightened by the tightening strap. The non-working surfaces of the working parts have their own different part numbers and names, which makes it easier for workers to identify the product during work. 5. The lower part of the pallet assembly is evenly distributed with support bases, and the outer side of the product is equipped with a tightening strap, making the riveting frame safer, more convenient and faster to assemble and disassemble; 6. Adjustable foot supports are installed at the bottom of the fixed frame, which can adjust the height of the fixed frame to achieve the actual usage height; 7. The lifting platform can be adjusted at will during the lifting process, and the limit sensor is installed on the fixed frame at a certain distance below the lifting platform. The limit sensor will ensure that the riveting frame has good safety and accessibility to the working position.

[0016] 8. A step ladder is fixed at each of the left and right ends of the fixed frame. The step ladder is only a lifting platform for entering the riveting frame from the outside ground. It has good accessibility, reduces the fatigue of the staff, reduces time, and improves the efficiency of the riveting work. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the riveting frame structure for a large passenger aircraft according to this utility model. Figure 1 ; Figure 2 This is a schematic diagram of the riveting frame structure for a large passenger aircraft according to this utility model. Figure 2 ; Figure 3 This is the front view of the main frame; Figure 4 This is a front view of the lifting platform; Figure 5 A front view of multiple positioning components arranged on the same side; Figure 6 This is a front view of the staircase. Figure 7 This is a front view of multiple guardrails arranged on the same side; Figure 8 Isometric drawing of the lifting platform; Figure 9 Isometric drawing of the transmission mechanism; Figure 10 This diagram shows the signal connection between the PLC and the motor and limit sensor of a single lifting platform.

[0018] The component names and reference numerals in the above figures are as follows: Fixed frame 1, lifting platform 2, lifting platform frame 2-1, lifting source mechanism 2-2, motor 2-2-1, reducer 1 2-2-2, coupling 1 2-2-3, transmission link 2-2-4, base 2-2-5, lead screw 2-2-6, transmission shaft 2-2-7, telescopic pedal 2-3, transmission mechanism 2-4, drive wheel 2-4-1, driven wheel 2-4-2, bearing seat 2-4-3, bracket 2-4-4 2-4-5, pressure plate, 2-4-7, timing belt, 2-4-8, second coupling, 2-4-9, output shaft of second reducer, 2-4-9, housing, 2-4-10, lifting handle, 2-5, positioning assembly, 3, clamping plate, 3-2, ear connector, 3-3, connecting seat, 3-4, support seat, 3-5, step ladder, 4, guardrail, 5, universal casters, 6, limit sensor, 7, adjustable feet, 8, PLC. Detailed Implementation

[0019] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. The described embodiments are only some embodiments of the utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this invention.

[0020] like Figures 1-10As shown, this embodiment describes a large passenger aircraft riveting frame, including a fixed frame 1, multiple lifting platforms 2, multiple positioning components 3, two step ladders 4, multiple slide rails, and multiple adjustable feet 8; the bottom of the fixed frame 1 (via multiple screws) is fixedly connected to multiple symmetrically arranged adjustable feet 8 (purchased parts) (the fixed frame 1 is supported and leveled by the multiple adjustable feet 8), the fixed frame 1 is divided into multiple frame units by multiple intermediate frames, each frame unit is provided with a lifting platform 2, the control system of each lifting platform 2 is integrated on a PLC 9 (the PLC 9 realizes precise control of the lifting platform 2), and each lifting platform 2 is connected to the PLC 9 through its control system. The LC9 signal connection enables individual control; the lifting platform 2 can move up and down along multiple slide rails, which are symmetrically arranged relative to the lifting platform 2 and fixed within the fixed frame 1 (the lifting direction of the lifting platform 2 is limited by the slide rails; preferably, each lifting platform is equipped with four slide rails); a positioning component 3 is fixed to the front and rear sides of each frame unit (by screws) (the positioning component 3 plays the role of positioning the product, therefore, the position needs to be checked to ensure accuracy before installation); a step ladder 4 is fixed to the left and right ends of the fixed frame 1 (by screws), and entrances and exits to the fixed frame 1 are provided at the corresponding positions on the upper end of the step ladder 4 and the upper end of the fixed frame 1.

[0021] The fixed frame 1 is constructed entirely of welded steel plates and square steel (to ensure overall strength), with the steel plates located at the bottom of the fixed frame 1. After welding, the surfaces of the fixed frame 1 that come into contact with other components are CNC machined to meet the surface roughness requirements.

[0022] Step ladder 4 serves as a bridge for workers to go up and down the riveting frame.

[0023] Furthermore, such as Figure 1 , Figure 5 As shown, each positioning component 3 includes a clamping plate 3-1 (made of 6061 aluminum plate), multiple ear-shaped connectors 3-2, multiple connecting seats 3-3, multiple support seats 3-4, multiple support frames 3-5, and at least one tightening strap; multiple connecting seats 3-3 are fixed on the clamping plate 3-1, and the upper and lower ends of the clamping plate 3-1 are respectively fixed to the fixed frame 1 through the connecting seats 3-3 (and screws); multiple ear-shaped connectors 3-2 are respectively fixed to the clamping plate 3-1 through their respective corresponding connecting seats 3-3 (and screws) (the ear-shaped connectors 3-2 and the connecting seats 3-3 are fixedly connected by screws), the support seats 3-4 are connected to the support frames 3-5, and the support frames 3-5 are fixed to the fixed frame 1 (during product installation, the support seats 3-4 provide support for the product), and all the tightening straps are connected to the clamping plate 3-1 (the tightening straps tighten the product).

[0024] The CNC machining chuck 3-1 has a profile surface that contacts the product. This profile surface is located in the middle of the inner side of the chuck 3-1 and is a concave arc surface. The non-working surfaces of the working parts each have their own unique part numbers and names.

[0025] After the ear piece connector 3-2 is connected to the card plate 3-1, the ear piece connector 3-2 is connected and positioned with the product, and the positioning and pressing of the product surface are achieved.

[0026] Furthermore, such as Figure 1 , Figure 8 , Figure 9 As shown, each of the lifting platforms 2 includes a lifting platform frame 2-1, a lifting source mechanism 2-2, a telescopic pedal 2-3, a transmission mechanism 2-4, and a lifting handle 2-5. The lifting source mechanism 2-2 is fixed on the fixed frame 1 and is connected to the PLC9 signal. The transmission mechanism 2-4 is fixed inside the lifting platform frame 2-1. The handle shaft of the lifting handle 2-5 is connected to the reducer 2-4-9 of the transmission mechanism 2-4. The telescopic pedal 2-3 is fixed on the transmission mechanism 2-4 and achieves the forward and backward telescopic function through the drive of the transmission mechanism 2-4. The lifting source mechanism 2-2 is controlled by the PLC9 to realize the lifting of the lifting platform frame 2-1.

[0027] The lifting platform frame 2-1 is welded from Q235 steel plate and square steel. Part of the Q235 steel plate serves as a slider, slidingly connected to the lifting platform frame 2-1 and the slide rail. The lifting platform frame 2-1 is welded using a fully automatic submerged arc welding three-pass welding process with a weld height of 10mm. Its features include dustproof and leakproof, easy cleaning, and strong welding. After welding, the table surface is CNC machined.

[0028] Furthermore, such as Figure 9As shown, the lifting source mechanism 2-2 includes a motor 2-2-1 (a servo motor), a reducer 2-2-2, two couplings 2-2-3, two transmission links 2-2-4, two bases 2-2-5, two lead screws 2-2-6, and two transmission shafts 2-2-7. The motor 2-2-1 is fixed to the fixed frame 1. The output shaft of the motor 2-2-1 is connected to the input shaft of the reducer 2-2-2. The two output shafts of the reducer 2-2-2 are respectively connected to one end of the corresponding transmission link 2-2-4 through couplings 2-2-3. The other end of the transmission link is fixedly connected to the center hole of the driving bevel gear in the base. The lower end of the transmission shaft is fixedly connected to the center hole of the driven bevel gear in the base. The driving bevel gear and the driven bevel gear mesh with each other. The transmission connecting rod 2-2-4 passes through the base 2-2-5 and is rotatably connected to the base 2-2-5 (via bearings). The transmission shaft 2-2-7 is rotatably connected to the base 2-2-5 (via bearings). The bevel gearbox structure consisting of the base 2-2-5, the driving bevel gear, the driven bevel gear, the transmission connecting rod, and the transmission shaft is existing technology. The upper end of the transmission shaft 2-2-7 is coaxially integrated with the lead screw 2-2-6. The lead screw 2-2-6 is screwed into the lead screw nut, which is fixed to the bottom of the lifting platform frame 2-1. (The base 2-2-5 contains a meshing driving bevel gear and a driven bevel gear. The transmission connecting rod 2-2-4 and the transmission shaft 2-2-7 are rotatably connected to the base 2-2-5 (via bearings). The structure of the base 2-2-5 is existing technology.)

[0029] Furthermore, such as Figure 8 , Figure 9 As shown, the transmission mechanism 2-4 includes two drive wheels 2-4-1, two driven wheels 2-4-2, bearing seats 2-4-3, two brackets 2-4-4, two pressure plates 2-4-5, two synchronous belts 2-4-7, two couplings 2-4-8, a reducer 2-4-9, and four housings 2-4-10. The bearing seats 2-4-3 are pre-connected to the input shaft of the reducer 2-4-9. The output shaft of the reducer 2-4-9 is connected to the axle of its corresponding drive wheel 2-4-1 via couplings 2-4-8. The drive wheels 2-4-1 are connected to the driven wheels 2-4-1 via synchronous belts 2-4-7. -4-2 transmission connection, two synchronous belts 2-4-7 are arranged side by side in the front-to-back direction, and a pressure plate 2-4-5 is fixed on the upper surface of each synchronous belt 2-4-7; two drive wheels 2-4-1 and two driven wheels 2-4-2 are respectively installed in their respective housings 2-4-10, and the axles of the drive wheels 2-4-1 and driven wheels 2-4-2 are respectively (through bearings) rotatably connected to their respective housings 2-4-10. A bracket 2-4-4 is fixed on the outer wall of the housing where the drive wheels 2-4-1 are installed. The bearing seat 2-4-3, the bracket 2-4-4 and the housing 2-4-10 are all fixedly connected to the inside of the lifting platform frame 2-1; The input shaft of reducer 2-4-9 is connected to the handle shaft of lifting handle 2-5 (the end of the input shaft of reducer 2-4-9 is provided with a spline hole, the outer wall of the handle shaft of lifting handle 2-5 is provided with an external spline, and the handle shaft of lifting handle 2-5 is splinedly connected to the spline hole of the input shaft of reducer 2-4-9); the telescopic pedal 2-3 is fixed on the two pressure plates 2-4-5, and the telescopic pedal 2-3 is located inside the lifting platform frame 2-1.

[0030] The lifting handle 2-5 includes a handle shaft and a handwheel; the handwheel (via a key) is fixedly mounted on the upper end of the handle shaft (the handwheel and handle shaft are connected by screws). By manually rotating the handwheel of the lifting handle 2-5, the input shaft of the reducer 2-4-9 inside the bearing housing 2-4-3 is driven to rotate, thereby driving the drive wheel 2-4-1 to rotate. The drive wheel 2-4-1 is connected to the driven wheel 2-4-2 via a synchronous belt 2-4-7. The synchronous belt 2-4-7, the drive wheel 2-4-1, and the driven wheel 2-4-2 form a belt drive mechanism, which drives the pressure plate 2-4-5 to move back and forth, thereby enabling the telescopic pedal 2-3 to extend and retract.

[0031] Furthermore, such as Figure 1 , Figure 8 As shown, the telescopic pedal 2-3 includes a pedal frame (made of square tubing welded together), a patterned aluminum plate, and an anti-collision rubber strip; the patterned aluminum plate is riveted to the upper end face of the pedal frame (with rivets), and the periphery of the patterned aluminum plate is riveted to the anti-collision rubber strip (with rivets).

[0032] Telescopic pedals 2-3 are used to ensure accessibility for riveting work when the lifting platform 2 is raised to the working area.

[0033] Furthermore, such as Figure 1 As shown, the frame of the step ladder 4 is welded from square steel, the upper end of the step ladder 4 is provided with a platform, and the bottom of the step ladder 4 is equipped with multiple omnidirectional casters 6.

[0034] Furthermore, such as Figure 1 , Figure 7 As shown, the riveting frame also includes multiple guardrails 5; guardrails 5 are fixedly installed on both the front and rear sides of each frame unit.

[0035] The guardrail 5 is installed to ensure the safety of workers working above it. The guardrail 5 is welded from a round tube and a connecting plate (steel plate), and the guardrail 5 is fixedly connected to the fixed frame 1 through the connecting plate.

[0036] Furthermore, such as Figure 1 , Figure 10 As shown, a limit sensor 7 is installed on the fixed frame 1. The limit sensor 7 is located below the lifting platform 2 and is connected to the PLC 9 for signal response.

[0037] The working process of this riveting bracket is as follows: 1) Use hoisting equipment to hoist each panel assembly of the large passenger aircraft onto the riveting frame, and use lug connectors 3-2 to position the panel assembly onto the riveting frame; 2) The lifting platform 2 is raised and lowered by PLC9 to the working height. Then, the telescopic pedals 2-3 are extended and retracted to transport the workers to the vicinity of the products for easy operation.

[0038] 3) The product's bracket is positioned against the wall panel through its own holes, and then holes are drilled in the product's bracket according to the product's bracket drilling jig; 4) Manually position the corner pieces. Drill fastener holes for connecting the corner pieces on the riveting frame and enlarge them to the final hole. 5) Position the product slide rail with the center line of the product slide rail as the reference, drill the fastener hole three between the product slide rail and the crossbeam of the fixed frame 1 on the riveting frame, install the temporary fastener and lock it. 6) Clean and deburr the disassembled product brackets and system corner pieces, seal the product mating surfaces, reassemble the disassembled product parts and pre-tighten them, and install the fasteners. 7) Final inspection.

[0039] The difference between this new riveting frame and the traditional riveting frame is that: 1) The riveting frame of this utility model can be used for riveting work on similar types of products. Compared with the traditional riveting frame, it has more versatility, stability, safety and accessibility.

[0040] 2) The telescopic pedals 2-3 are manually operated, which is convenient to operate and improves production efficiency.

[0041] 3) Each lifting platform 2 is driven by a lifting source mechanism 2-2, which facilitates lifting and lowering and ensures safe operation. In the event of a sudden power outage, the lifting platform 2 can remain stable and not fall.

[0042] 4) The fixed frame 1 is firmly welded from square steel and steel plate to ensure its strength.

[0043] 5) Positioning components 3 and other medium and large parts are equipped with lifting rings. The lifting rings are purchased externally and can meet the needs of overhead crane transportation for riveting frames.

[0044] Technical parameters of this utility model riveting frame: Each lifting platform 2 can carry a maximum load of 4 tons, the riveting frame itself weighs about 16.7 tons, and the floor area is 17.44m×6m.

[0045] In summary, when using this utility model, the lower end of the fixed frame 1 is screwed to multiple adjustable feet 8, the riveting frame is adjusted to the working state, and then the lifting platform 2 is slidably set inside the fixed frame 1.

[0046] The product is positioned on the positioning component 3. After the product is positioned and locked by the ear connector 3-2, the clamping plate 3-1, the support base 3-4, the tightening strap, etc., the relevant riveting work is carried out on the product. After the riveting work is completed, the product is moved to the next process.

Claims

1. A large passenger aircraft riveting bracket, characterized in that: It includes a fixed frame (1), multiple lifting platforms (2), multiple positioning components (3), two step ladders (4), multiple slide rails and multiple adjustable feet (8); the bottom of the fixed frame (1) is fixedly connected to multiple adjustable feet (8) arranged symmetrically. The fixed frame (1) is divided into multiple frame units by multiple intermediate frames. Each frame unit is equipped with a lifting platform (2). The control system of each lifting platform (2) is integrated on the PLC (9). Each lifting platform (2) is connected to the PLC (9) through its control system to achieve individual control. The lifting platform (2) can move up and down along multiple slide rails. The multiple slide rails are symmetrically arranged relative to the lifting platform (2) and fixed in the fixed frame (1). Each frame unit has a positioning component (3) fixed on the front and rear sides respectively. The left and right ends of the fixed frame (1) are fixed with a step ladder (4) respectively. The upper end of the step ladder (4) and the upper end of the fixed frame (1) are respectively provided with entrances and exits to the fixed frame (1).

2. The large passenger aircraft riveting frame according to claim 1, characterized in that: Each of the positioning components (3) includes a clamping plate (3-1), multiple ear-shaped connectors (3-2), multiple connecting seats (3-3), multiple support seats (3-4), multiple support frames (3-5), and at least one tightening strap; multiple connecting seats (3-3) are fixed on the clamping plate (3-1), and the upper and lower ends of the clamping plate (3-1) are respectively fixed to the fixed frame (1) through the connecting seats (3-3); multiple ear-shaped connectors (3-2) are respectively fixed to the clamping plate (3-1) through their respective connecting seats (3-3), the support seats (3-4) are connected to the support frames (3-5), the support frames (3-5) are fixed to the fixed frame (1), and all the tightening straps are connected to the clamping plate (3-1).

3. The large passenger aircraft riveting frame according to claim 1, characterized in that: Each of the aforementioned lifting platforms (2) includes a lifting platform frame (2-1), a lifting source mechanism (2-2), a telescopic pedal (2-3), a transmission mechanism (2-4), and a lifting handle (2-5). The lifting source mechanism (2-2) is fixed on the fixed frame (1), and the lifting source mechanism (2-2) is connected to the PLC (9) via signal. The transmission mechanism (2-4) is fixed inside the lifting platform frame (2-1). The handle shaft of the lifting handle (2-5) is connected to the reducer (2-4-9) of the transmission mechanism (2-4) via transmission. The telescopic pedal (2-3) is fixed on the transmission mechanism (2-4). The forward and backward telescopic function is realized by the drive of the transmission mechanism (2-4). The lifting platform frame (2-1) is lifted by the control of the lifting source mechanism (2-2) by the PLC (9).

4. The large passenger aircraft riveting frame according to claim 3, characterized in that: The lifting mechanism (2-2) includes a motor (2-2-1), a reducer (2-2-2), two couplings (2-2-3), two transmission rods (2-2-4), two bases (2-2-5), two lead screws (2-2-6), and two transmission shafts (2-2-7). The motor (2-2-1) is fixed on the fixed frame (1), and the output shaft of the motor (2-2-1) is connected to the input shaft of the reducer (2-2-2). The two output shafts of the reducer (2-2-2) are respectively connected to the two couplings (2-2-3). -3) Connect one end of the corresponding transmission link (2-2-4), and the other end of the transmission link (2-2-4) is fixedly connected to the center hole of the active bevel gear in the base (2-2-5). The lower end of the transmission shaft (2-2-7) is fixedly connected to the center hole of the driven bevel gear in the base (2-2-5). The active bevel gear and the driven bevel gear mesh with each other. The upper end of the transmission shaft (2-2-7) is coaxially integrated with the lead screw (2-2-6). The lead screw (2-2-6) is screwed into the lead screw nut, and the lead screw nut is fixed at the bottom of the lifting platform frame (2-1).

5. The large passenger aircraft riveting frame according to claim 3, characterized in that: The transmission mechanism (2-4) includes two drive wheels (2-4-1), two driven wheels (2-4-2), bearing seats (2-4-3), two brackets (2-4-4), two pressure plates (2-4-5), two synchronous belts (2-4-7), two couplings (2-4-8), a reducer (2-4-9), and four housings (2-4-10). The bearing seats (2-4-3) are pre-connected to the input shaft of the reducer (2-4-9). The output shaft 2-4-6 of the reducer (2-4-9) is connected at both ends to the axle of its corresponding drive wheel (2-4-1) via couplings (2-4-8). The drive wheels (2-4-1) are connected to the synchronous belts (2-4-7). The driven wheel (2-4-2) is connected to the transmission. Two synchronous belts (2-4-7) are arranged side by side in the front-to-back direction. Each synchronous belt (2-4-7) has a pressure plate (2-4-5) fixed on its upper surface. Two drive wheels (2-4-1) and two driven wheels (2-4-2) are respectively installed in their respective housings (2-4-10). The axles of the drive wheels (2-4-1) and driven wheels (2-4-2) are rotatably connected to their respective housings (2-4-10). A bracket (2-4-4) is fixed on the outer wall of the housing containing the drive wheel (2-4-1). The bearing seat (2-4-3), the bracket (2-4-4), and the housing (2-4-10) are all fixedly connected to the inside of the lifting platform frame (2-1). The input shaft of reducer 2 (2-4-9) is connected to the handle shaft of lifting handle (2-5) via a transmission drive; the telescopic pedal (2-3) is fixed on two pressure plates (2-4-5), and the telescopic pedal (2-3) is located inside the lifting platform frame (2-1).

6. The large passenger aircraft riveting frame according to claim 3 or 5, characterized in that: The telescopic pedal (2-3) includes a pedal frame, a patterned aluminum plate, and an anti-collision rubber strip; the patterned aluminum plate is riveted to the upper end face of the pedal frame, and the periphery of the patterned aluminum plate is riveted to the anti-collision rubber strip.

7. The large passenger aircraft riveting frame according to claim 1, characterized in that: The frame of the step ladder (4) is welded from square steel. The upper end of the step ladder (4) is provided with a platform, and the bottom of the step ladder (4) is equipped with multiple omnidirectional casters (6).

8. The large passenger aircraft riveting frame according to claim 1, characterized in that: The riveting frame also includes multiple guardrails (5); guardrails (5) are fixedly installed on both the front and rear sides of each frame unit.

9. The large passenger aircraft riveting bracket according to claim 1, characterized in that: A limit sensor (7) is installed on the fixed frame (1). The limit sensor (7) is located below the lifting platform (2) and is connected to the PLC (9) via signal.

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