An aerospace-based positioning device for bellows welding

Abstract

This invention discloses a positioning device for bellows welding based on aerospace technology, relating to the field of bellows welding technology. It includes a laser welding mechanism, first and second positioning mechanisms slidably fitted thereon, and connecting flanges clamped on the two positioning mechanisms and a bellows passing through the welding mechanism. The first positioning mechanism includes a first flange clamping component and a turntable component, while the second positioning mechanism includes a positioning component and a second flange clamping component. The laser welding mechanism is equipped with a rotating shaft roller with a curved guide groove. By driving the rotating shaft roller to rotate, the two positioning mechanisms move synchronously in opposite directions, achieving axial compression positioning of the bellows before welding. Each flange clamping component, through an arc-shaped groove on the turntable component cooperating with a lever, drives multiple radial slides to synchronously clamp the connecting flange in a centripetal manner, and simultaneously drives an L-shaped abutment plate to assist in pressing the flange end face, achieving double locking and effectively improving welding quality and efficiency.

Description

Technical Field

[0001] This invention relates to the field of bellows welding technology, and more specifically, to a positioning device for bellows welding based on aerospace technology. Background Technology

[0002] As a flexible sealing element, bellows are widely used in hydraulic systems, fuel delivery systems, and engine pipelines in aerospace. The welding quality between bellows and connecting flanges directly affects the sealing safety and reliability of the entire pipeline system. With the increasing demands for welding precision and efficiency in the aerospace field, laser welding technology, due to its advantages such as high energy density, small heat-affected zone, and minimal welding deformation, has gradually become the main process for connecting bellows components.

[0003] Currently, positioning devices for bellows welding on the market typically include a mandrel or sleeve for supporting the bellows, a clamp for holding the connecting flanges, and a drive mechanism for rotating the workpiece. During operation, the bellows is first threaded onto the mandrel, then the two connecting flanges are placed at both ends of the bellows. The flanges are clamped manually or pneumatically. The rotary drive mechanism is then activated to rotate the flanges, while the laser welding head aligns with the joint for circumferential welding.

[0004] Although the above-mentioned device can complete basic welding operations, the bellows itself has a certain axial elasticity. If it is not compressed to an appropriate state before actual welding, the bellows is prone to axial movement or radial swaying under the action of heat and centrifugal force during welding, resulting in weld offset and uneven penetration, which seriously affects the welding quality. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide an aerospace-based positioning device for bellows welding that can precisely adjust the bellows to a fully compressed state before welding, effectively preventing swaying or displacement during the rotary welding process due to the bellows' own elastic properties, thereby ensuring the uniformity and consistency of the weld and improving the welding quality.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A positioning device for corrugated pipe welding based on aerospace applications includes a laser welding mechanism, a first positioning mechanism slidably fitted on the laser welding mechanism, a second positioning mechanism slidably fitted on the laser welding mechanism, two connecting flanges respectively clamping and positioning the first positioning mechanism and the second positioning mechanism, and a corrugated pipe passing through the laser welding mechanism. The first positioning mechanism includes a first flange clamping member slidably fitted on the laser welding mechanism and a turntable member rotatably fitted on the first flange clamping member. The second positioning mechanism includes a positioning member slidably fitted on the laser welding mechanism and a second flange clamping member rotatably fitted on the positioning member. The laser welding mechanism includes a mounting base, with a limiting slide rail fixed to the top of the mounting base that slidably fits with the first flange clamping member and the positioning member. A baffle is fixed to the outer side of the top of the mounting base away from the limiting slide rail. An arched protective cover connected to the mounting base is fixed to one side of the baffle. A rotating shaft roller is rotatably fitted inside the arched protective cover on one side of the baffle. The top of the rotating shaft roller has symmetrically distributed curved guide channels, and the two curved guide channels slidably fit with the first flange clamping member and the positioning member, respectively.

[0007] The invention is further configured as follows: a limiting transverse groove is formed through one side of the arched protective cover; a rectangular guide groove parallel to the limiting transverse groove is formed through one outer side of the limiting slide; an L-shaped mounting plate is fixed to the other outer side of the limiting slide; a PLC controller is fixed to one outer side of the L-shaped mounting plate; a vertical plate is fixed to the bottom of the limiting slide between the first positioning mechanism and the second positioning mechanism; a sleeve is fixed to the top of the vertical plate; a limiting ring is fixed to the center of the circumferential side of the rotating shaft roller between two curved guide grooves; limiting circular plates are fixed to both ends of the rotating shaft roller; a first brake motor electrically connected to the PLC controller is fixed to one side of the baffle; the output shaft of the first brake motor is rotatably connected to the baffle, and the output shaft of the first brake motor is fixedly connected to the end of one of the limiting circular plates.

[0008] The present invention is further configured such that: the first flange clamping member includes a first U-shaped slide block that is slidably fitted inside the limiting slide rail, a first traveling roller that is rotatably fitted inside the first U-shaped slide block and is in contact with the bottom of the limiting slide rail, a first rectangular slider that is slidably fitted inside the rectangular guide groove is fixed on one side of the first traveling roller, a first round rod that is slidably fitted inside the limiting transverse groove is fixed on one side of the first rectangular slider, and a first sliding ball that is slidably fitted to one of the curved guide grooves is fixed at the end of the first round rod.

[0009] The present invention is further configured such that: the positioning component includes a second U-shaped slide block that is slidably fitted inside the limiting slide rail; a second traveling roller that is rotatably fitted inside the second U-shaped slide block and is in contact with the bottom of the limiting slide rail; a second rectangular slider that is slidably fitted inside the rectangular guide groove is fixed on one side of the second traveling roller; a second round rod that is slidably fitted inside the limiting transverse groove is fixed on one side of the second rectangular slider; and a second sliding ball that is slidably fitted with another curved guide groove is fixed at the end of the second round rod.

[0010] The present invention is further configured as follows: a first vertical plate is fixed to the top of the first U-shaped slide block; a first fixing ring coaxially arranged with the sleeve is fixed to the top of the first vertical plate; a first annular rail is rotatably fitted to the end of the first fixing ring through a bearing; a plurality of first U-shaped plates are connected to the outer circumferential side of the first annular rail; a first L-shaped circular rail coaxially arranged with the first fixing ring is fixed between the plurality of first U-shaped plates; a first radial slide block is radially slidably fitted inside the plurality of first U-shaped plates; a first clamping plate is fixed to the end of the plurality of first radial slide blocks inside the first fixing ring; and a first lever is fixed to the side of the plurality of first radial slide blocks.

[0011] The present invention is further configured such that: a first L-shaped support plate is fixed on the inner wall of the first fixing ring between two adjacent first clamping plates; two symmetrically arranged first slide rods are slidably fitted through one outer side of the first L-shaped support plate; a first limiting plate is fixed at the end of the two first slide rods inside the first L-shaped support plate; two first springs are fixed between the first limiting plate and the first L-shaped support plate and respectively sleeved on the two first slide rods; and a first L-shaped abutment is fixed at the end of the two first slide rods outside the first L-shaped support plate.

[0012] The invention is further configured as follows: the turntable component includes a first rotating disk, an annular groove is formed at the end of the first rotating disk, the annular groove is rotatably engaged with a first L-shaped circular rail via a bearing, a plurality of first arc-shaped grooves are formed through the peripheral side of the first rotating disk, each respectively slidably engaged with a plurality of first levers, a first pin is fixed to the opposite end face of the first rotating disk, and a plurality of first protrusions are fixed to the inner wall of the first rotating disk; a first pin seat is fixed to the outer peripheral side of the first L-shaped circular rail, a first telescopic rod electrically connected to the PLC controller is rotatably engaged on the first pin seat, a first pin plate is fixed to the telescopic end of the first telescopic rod and rotatably engaged with the first pin, a first extension rod is fixed to the side of a plurality of first L-shaped abutments, and a first ball is fixed to the end of the first extension rod and slidably engaged with the first rotating disk and the first protrusions; a second vertical plate is fixed to the top of the second U-shaped slide, and a second L-shaped circular rail is coaxially arranged with the sleeve tube on the top of the second vertical plate.

[0013] The invention is further configured as follows: the second flange clamping member includes a second annular rail, a plurality of second U-shaped plates are connected to the outer peripheral side of the second annular rail, a third L-shaped circular rail coaxially arranged with the second annular rail is fixed between the plurality of second U-shaped plates, a second rotating disk is rotatably engaged at the end of the third L-shaped circular rail via a bearing, a rotating sleeve is fixed at the end of the second annular rail, and the rotating sleeve is rotatably engaged with the second L-shaped circular rail via a bearing; a second radial slide block is radially slidably engaged inside the plurality of second U-shaped plates, a second clamping plate is fixed at the end of the plurality of second radial slide blocks located inside the second annular rail, and a second lever is fixed on the side of the plurality of second radial slide blocks; a plurality of second protrusions are fixed on the inner wall of the second rotating disk, a plurality of second arc-shaped grooves are opened through the peripheral side of the second rotating disk respectively slidably engaged with the plurality of second levers, a second pin is fixed on the end face of the second rotating disk, a second pin seat is fixed on the outer peripheral side of the third L-shaped circular rail, a second telescopic rod electrically connected to the PLC controller is rotatably engaged on the second pin seat, and a second pin plate rotatably engaged with the second pin is fixed at the telescopic end of the second telescopic rod.

[0014] The invention is further configured as follows: A second L-shaped support plate is fixed to the inner wall of the second annular rail between two adjacent second clamping plates; two symmetrically arranged second sliding rods are slidably fitted through one outer side of the second L-shaped support plate; a second limiting plate is fixed to the end of each of the two second sliding rods inside the second L-shaped support plate; two second springs, respectively sleeved on the two second sliding rods, are fixed between the second limiting plate and the second L-shaped support plate; a second L-shaped abutment is fixed to the end of each of the two second sliding rods outside the second L-shaped support plate; a second extension rod is fixed to the side of several second L-shaped abutments; a second ball is fixed to the end of each second extension rod and slidably fitted with the second rotating disk and the second protrusion; an extension plate is fixed to the end of the second annular rail between two adjacent second protrusions; a ring gear coaxially arranged with the second annular rail is fixed to the end of the extension plate; an L-shaped motor base is fixed to the side of the second vertical plate near the bottom; a second brake motor electrically connected to the PLC controller is fixed to one outer side of the L-shaped motor base; and a rotating gear meshing with the ring gear is fixed to the output shaft of the second brake motor.

[0015] The invention is further configured such that: a vertical side plate is fixed at the top of the mounting base inside the limiting slide; a first telescopic cylinder electrically connected to the PLC controller is fixed on the side of the vertical side plate; a guide crossbar is fixed on the side of the vertical side plate below the first telescopic cylinder; a laser welding slide block is fixed to the first telescopic cylinder and slides through the guide crossbar; a second telescopic cylinder electrically connected to the PLC controller is fixed on one outer side of the laser welding slide block; and a laser welder electrically connected to the PLC controller is fixed to the telescopic end of the second telescopic cylinder.

[0016] The advantages of this invention are: 1. By setting symmetrically distributed curved guide channels and slidingly engaged with them, and cooperating with the first sliding ball and the second sliding ball, and with the first brake motor driving the rotating shaft roller, the first flange clamping member and the positioning member move synchronously and in opposite directions on the limiting slide. This allows the bellows to be precisely adjusted to a fully compressed state before welding, effectively avoiding shaking or displacement during the rotation welding process due to the elastic characteristics of the bellows itself, thereby ensuring the uniformity and consistency of the weld and improving the welding quality.

[0017] 2. This invention utilizes the interaction between the first arc-shaped groove and the first lever, and the second arc-shaped groove and the second lever on the turntable component. By simply driving the first or second rotating disc to rotate, multiple radial slides can be moved synchronously, achieving simultaneous centripetal clamping or loosening of the connecting flange by multiple clamping plates. Simultaneously, the sliding engagement of the protrusion and the ball synchronously drives the L-shaped abutment plate to provide axial auxiliary clamping of the connecting flange, forming a dual locking effect of radial clamping and axial positioning. Furthermore, the spring provides buffering and holding force, ensuring the reliability and stability of the clamping.

[0018] 3. The present invention achieves the sliding of the first flange clamping member and the positioning member through multiple sliding cooperation of the traveling roller, the rectangular slider and the rectangular guide groove, and the round rod and the limiting transverse groove. This ensures both the straightness and stability of the movement and reduces the sliding friction resistance, thus ensuring the displacement accuracy and repeatability of the positioning mechanism during the adjustment process. Attached Figure Description

[0019] Figure 1 This is a front view of a positioning device for bellows welding based on aerospace technology, according to the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of a positioning device for corrugated pipe welding based on aerospace technology according to the present invention.

[0021] Figure 3 This is a schematic diagram of the laser welding mechanism of the present invention.

[0022] Figure 4 This is a schematic diagram of the cross-sectional structure of the laser welding mechanism of the present invention.

[0023] Figure 5 This is a schematic diagram of the structure of the first positioning mechanism of the present invention.

[0024] Figure 6 This is a schematic diagram of the structure of the second positioning mechanism of the present invention.

[0025] Figure 7 This is a schematic diagram of the structure of the first flange clamping member of the present invention.

[0026] Figure 8 For the present invention Figure 7A magnified structural diagram of point A in the middle.

[0027] Figure 9 This is a rear view of the first flange clamping member of the present invention.

[0028] Figure 10 This is a schematic diagram of the structure of the turntable component of the present invention.

[0029] Figure 11 This is a schematic diagram of the positioning component of the present invention.

[0030] Figure 12 This is a schematic diagram of the structure of the second flange clamping member of the present invention.

[0031] Figure 13 For the present invention Figure 12 A magnified structural diagram at point B in the middle.

[0032] Figure 14 This is a three-dimensional structural diagram of the second flange clamping member of the present invention.

[0033] In the diagram: 1. Laser welding mechanism; 2. First positioning mechanism; 3. Second positioning mechanism; 4. Connecting flange; 5. First flange clamping component; 6. Turntable component; 7. Positioning component; 8. Second flange clamping component; 9. Bellows; 101. Mounting base; 102. Limiting slide; 103. Baffle; 104. Arched protective cover; 105. Rotating shaft roller; 106. Curved guide channel; 107. Limiting transverse groove; 108. Rectangular guide groove; 109. L-shaped mounting plate; 110. PLC controller; 111. Vertical plate; 112. Socket; 113. Limiting ring; 114. Limiting circular plate; 115. First brake motor; 116. Vertical side plate ; 117. First telescopic cylinder; 118. Guide crossbar; 119. Laser welding slide; 120. Second telescopic cylinder; 121. Laser welder; 501. First U-shaped slide; 502. First traveling roller; 503. First rectangular slider; 504. First round rod; 505. First sliding ball; 506. First vertical plate; 507. First fixing ring; 508. First annular rail; 509. First U-shaped plate; 510. First L-shaped annular rail; 511. First radial slide; 512. First clamping plate; 513. First lever; 514. First L-shaped support plate; 515. First sliding rod; 516. First limiting plate; 517. 518. First L-shaped stop plate; 519. First pin seat; 520. First telescopic rod; 521. First pin plate; 522. First extension rod; 523. First sphere; 601. First rotating disk; 602. Annular groove; 603. First arc groove; 604. First pin; 605. First protrusion; 701. Second U-shaped slide block; 702. Second traveling roller; 703. Second rectangular slider; 704. Second round rod; 705. Second sliding ball; 706. Second vertical plate; 707. Second L-shaped ring rail; 708. L-shaped motor seat; 709. Second brake motor; 710. Rotary gear; 801. Second 802. Circular rail; 803. Second U-shaped plate; 804. Third L-shaped circular rail; 805. Second rotating disk; 806. Rotating sleeve; 807. Second radial slide; 808. Second clamping plate; 809. Second lever; 810. Second protrusion; 811. Second arc groove; 812. Second pin; 813. Second pin seat; 814. Second telescopic rod; 815. Second pin plate; 816. Second slide rod; 817. Second limiting plate; 818. Second spring; 819. Second L-shaped stop plate; 820. Second extension rod; 821. Second sphere; 822. Extension plate; 823. Ring gear. Detailed Implementation

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0036] In this invention, unless otherwise stated, the directional terms such as "up" and "down" generally refer to the directions shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" generally refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0037] Example 1, please refer to Figures 1-14 The present invention provides the following technical solution: a positioning device for corrugated pipe welding based on aerospace applications, specifically comprising a laser welding mechanism 1, a first positioning mechanism 2 slidably fitted on the laser welding mechanism 1, a second positioning mechanism 3 slidably fitted on the laser welding mechanism 1, two connecting flanges 4 respectively clamping and positioning the first positioning mechanism 2 and the second positioning mechanism 3, and a corrugated pipe 9 passing through the laser welding mechanism 1, characterized in that: the first positioning mechanism 2 includes a first flange clamping member 5 slidably fitted on the laser welding mechanism 1 and a turntable member 6 rotatably fitted on the first flange clamping member 5; the second positioning mechanism 3 includes a positioning member 7 slidably fitted on the laser welding mechanism 1 and... The second flange clamping member 8 is rotatably fitted on the positioning member 7; the laser welding mechanism 1 includes a mounting base 101, the top of the mounting base 101 is fixed with a limiting slide 102 that is slidably fitted with the first flange clamping member 5 and the positioning member 7, a baffle 103 is fixed on an outer side of the top of the mounting base 101 away from the limiting slide 102, an arched protective cover 104 connected to the mounting base 101 is fixed on one side of the baffle 103, a rotating shaft roller 105 is rotatably fitted inside the arched protective cover 104 on one side of the baffle 103, and a symmetrically distributed curved guide channel 106 is opened on the top of the rotating shaft roller 105, and the two curved guide channels 106 are slidably fitted with the first flange clamping member 5 and the positioning member 7 respectively; Furthermore, a limiting transverse groove 107 is provided through one side of the arched protective cover 104, and a rectangular guide groove 108 parallel to the limiting transverse groove 107 is provided through one outer side of the limiting slide 102. An L-shaped mounting plate 109 is fixed to the other outer side of the limiting slide 102, and a PLC controller 110 is fixed to one outer side of the L-shaped mounting plate 109. A vertical plate 111 is fixed at the bottom of the limiting slide 102 between the first positioning mechanism 2 and the second positioning mechanism 3, and the top of the vertical plate 111 is fixed. A sleeve 112 is fixed; a limiting ring 113 is fixed at the center of the circumferential side of the rotating shaft roller 105 between two curved guide channels 106, and limiting circular plates 114 are fixed at both ends of the rotating shaft roller 105; a first brake motor 115 electrically connected to the PLC controller 110 is fixed on one side of the baffle 103, the output shaft of the first brake motor 115 is rotatably connected to the baffle 103, and the output shaft of the first brake motor 115 is fixedly connected to the end of one of the limiting circular plates 114.

[0038] The specific application of this embodiment is as follows: In the initial state, the operator inserts the corrugated pipe 9 to be welded onto the sleeve 112, so that the corrugated pipe 9 is arranged along the axial direction of the sleeve 112 (the sleeve 112 can be composed of two semi-circular sleeves that are hinged to each other, which facilitates its opening and closing operation). Subsequently, the two connecting flanges 4 are placed at the clamping positions of the first positioning mechanism 2 and the second positioning mechanism 3, respectively.

[0039] The equipment is started, and the operator issues a control command through the PLC controller 110, causing the first brake motor 115 to start running. The output shaft of the first brake motor 115 drives the fixedly connected limiting circular plate 114 to rotate, which in turn drives the rotating shaft roller 105 to rotate on one side of the baffle 103. During the rotation of the rotating shaft roller 105, the two symmetrically distributed curved guide channels 106 on its top form a sliding engagement with the first sliding ball 505 on the first flange clamping member 5 and the second sliding ball 705 on the positioning member 7, respectively. Specifically, when the first sliding ball 505 slides in the corresponding curved guide channel 106, it drives the first rectangular slider 503 to slide along the rectangular guide groove 108 through the first round rod 504. At the same time, the first round rod 504 also slides in the limiting transverse groove 107, thereby realizing the sliding guidance of the first U-shaped slide block 501 inside the limiting slide rail 102. Simultaneously, the second sliding ball 705 slides within another curved guide channel 106, driving the second rectangular slider 703 to slide along the rectangular guide channel 108 via the second round rod 704. The second round rod 704 also slides within the limiting transverse groove 107, thus guiding the sliding of the second U-shaped slide block 701 within the limiting slide 102. During this process, both the first traveling roller 502 and the second traveling roller 702 roll in contact with each other at the bottom within the limiting slide 102, providing stable support for the sliding process and reducing frictional resistance. Because the two curved guide channels 106 are symmetrically arranged, when the rotating shaft roller 105 rotates, the first flange clamping member 5 and the positioning member 7 move in opposite directions on the limiting slide 102, i.e., they either move closer to each other or further away. By controlling the direction and rotation angle of the first brake motor 115, the distance between the first positioning mechanism 2 and the second positioning mechanism 3 is adjusted so that the two connecting flanges 4 are aligned and in contact with the two ends of the bellows 9 respectively. This ensures that the bellows 9 to be welded is in a fully compressed state before the welding operation, thus preventing the uncompressed bellows 9 from shaking due to its own characteristics during the rotation welding process, and avoiding any impact on the subsequent welding quality. Meanwhile, the arched protective cover 104 covers the outside of the rotating shaft roller 105 during equipment operation, providing safety protection and preventing operators from accidentally touching the rotating parts. The limiting ring 113 is located at the center of the circumferential side of the rotating shaft roller 105, between the two curved guide channels 106, serving as a separator and limiter to ensure that the two sliding balls slide smoothly within their respective channels without interference. At this point, the relative positions of the first positioning mechanism 2 and the second positioning mechanism 3 on the laser welding mechanism 1 are adjusted, and the two connecting flanges 4 are positioned at the welding positions at both ends of the bellows 9, preparing for subsequent clamping, fixing, and laser welding processes.

[0040] Example 2, please refer to Figures 1-14This second embodiment is an improvement on the first embodiment as follows: Specifically, the first flange clamping member 5 includes a first U-shaped slide block 501 that is slidably fitted inside the limiting slide 102. A first traveling roller 502, which is rotatably fitted inside the first U-shaped slide block 501 and is in contact with the bottom of the limiting slide 102, is fixed to one side of the first traveling roller 502. A first rectangular slider 503, which is slidably fitted inside the rectangular guide groove 108, is fixed to one side of the first rectangular slider 503. A first round rod 504, which is slidably fitted inside the limiting transverse groove 107, is fixed to one side of the first round rod 504. A first sliding ball 505, which is slidably fitted to one of the curved guide grooves 106, is fixed to the end of the first round rod 504. The positioning component 7 includes a second U-shaped slide block 701 that slides within the limiting slide rail 102. A second traveling roller 702, which is rotatably fitted inside the second U-shaped slide block 701 and conforms to the bottom of the limiting slide rail 102, is fixed to one side of the second traveling roller 702. A second rectangular slider 703 that slides within the rectangular guide groove 108 is fixed to one side of the second rectangular slider 703. A second round rod 704 that slides within the limiting transverse groove 107 is fixed to one side of the second rectangular slider 703. A second sliding ball 705 that slides within another curved guide groove 106 is fixed to the end of the second round rod 704. A first vertical plate 506 is fixed to the top of the first U-shaped slide block 501. A first fixing ring 507, coaxially aligned with the sleeve 112, is fixed to the top of the vertical plate 506. A first annular rail 508 is rotatably fitted to the end of the first fixing ring 507 via a bearing. A plurality of first U-shaped plates 509 are connected to the outer periphery of the first annular rail 508. A first L-shaped circular rail 510, coaxially aligned with the first fixing ring 507, is fixed between the plurality of first U-shaped plates 509. First radial slide blocks 511 are radially slidably fitted inside each of the plurality of first U-shaped plates 509. A first clamping plate 512 is fixed to the end of each of the plurality of first radial slide blocks 511 inside the first fixing ring 507. The sides of the plurality of first radial slide blocks 511... Each is fixed with a first lever 513; the inner wall of the first fixing ring 507 is fixed with a first L-shaped support plate 514 between two adjacent first clamping plates 512; two symmetrically arranged first slide rods 515 are slidably fitted through one outer side of the first L-shaped support plate 514; the ends of the two first slide rods 515 are fixed with a first limiting plate 516 inside the first L-shaped support plate 514; two first springs 517 are fixed between the first limiting plate 516 and the first L-shaped support plate 514 and respectively sleeved on the two first slide rods 515; the ends of the two first slide rods 515 are fixed with a first L-shaped abutment plate 518 outside the first L-shaped support plate 514.Turntable component 6 includes a first rotating disk 601. An annular groove 602 is formed at the end of the first rotating disk 601, and the annular groove 602 is rotatably engaged with a first L-shaped circular rail 510 via a bearing. Several first arc-shaped grooves 603 are formed through the circumference of the first rotating disk 601, each slidably engaging with several first levers 513. A first pin 604 is fixed to the opposite end face of the first rotating disk 601. Several first protrusions 605 are fixed to the inner wall of the first rotating disk 601. A first pin seat 519 is fixed to the outer circumference of the first L-shaped circular rail 510, and a device rotatably engaged with the first pin seat 519 is electrically connected to the PLC controller 110. The first telescopic rod 520 has a first pin plate 521 fixed at its telescopic end, which rotatably engages with the first pin 604. Several first L-shaped abutments 518 have first extension rods 522 fixed to their sides. The ends of the first extension rods 522 are fixed with first spheres 523 that slidably engage with the first rotating disk 601 and the first protrusion 605. A second vertical plate 706 is fixed to the top of the second U-shaped slide block 701. A second L-shaped ring rail 707, coaxially arranged with the sleeve connector 112, is fixed to the top of the second vertical plate 706. The second flange clamping member 8 includes a second ring rail 801, the outer periphery of which is connected to… A plurality of second U-shaped plates 802 are provided, and a third L-shaped annular rail 803, coaxially arranged with a second annular rail 801, is fixed between the plurality of second U-shaped plates 802. A second rotating disk 804 is rotatably fitted to the end of the third L-shaped annular rail 803 via a bearing. A rotating sleeve 805 is fixed to the end of the second annular rail 801, and the rotating sleeve 805 is rotatably fitted to the second L-shaped annular rail 807 via a bearing. A second radial slide block 806 is radially slidably fitted inside each of the plurality of second U-shaped plates 802. A second clamping plate 807 is fixed to the end of each of the plurality of second radial slide blocks 806 inside the second annular rail 801. A second lever 808 is fixed to each side of the slide block 806; a number of second protrusions 809 are fixed to the inner wall of the second rotating disk 804; a number of second arc-shaped grooves 810 are opened through the periphery of the second rotating disk 804, which are respectively slidably engaged with a number of second levers 808; a second pin 811 is fixed to the end face of the second rotating disk 804; a second pin seat 812 is fixed to the outer periphery of the third L-shaped ring rail 803; a second telescopic rod 813 electrically connected to the PLC controller 110 is rotatably engaged on the second pin seat 812; a second pin plate 814 rotatably engaged with the second pin 811 is fixed to the telescopic end of the second telescopic rod 813;The inner wall of the second annular rail 801 is fixed with a second L-shaped support plate 815 between two adjacent second clamping plates 807. Two symmetrically arranged second slide rods 816 are slidably fitted through one outer side of the second L-shaped support plate 815. A second limiting plate 817 is fixed inside the second L-shaped support plate 815 at the ends of the two slide rods 816. Two second springs 818, respectively sleeved on the two slide rods 816, are fixed between the second limiting plate 817 and the second L-shaped support plate 815. Second L-shaped abutments 819 are fixed outside the second L-shaped support plate 815 at the ends of the two slide rods 816. Several second L-shaped abutments 819 are fixed to the sides of the second L-shaped abutments 819. Two extension rods 820 have a second ball 821 fixed at their end, which slides with the second rotating disk 804 and the second protrusion 809. An extension plate 822 is fixed at the end of the second annular rail 801 between two adjacent second protrusions 809. A ring gear 823, coaxially aligned with the second annular rail 801, is fixed at the end of the extension plate 822. An L-shaped motor base 708 is fixed near the bottom of the second vertical plate 706. A second brake motor 709, electrically connected to the PLC controller 110, is fixed to one outer side of the L-shaped motor base 708. A rotating gear 710, meshing with the ring gear 823, is fixed to the output shaft of the second brake motor 709.

[0041] The specific application of this embodiment two is as follows: Based on the overall spacing adjustment of the first positioning mechanism 2 and the second positioning mechanism 3 completed in embodiment one, and the alignment and contact of the two connecting flanges 4 with the two ends of the bellows 9 respectively, embodiment two further realizes the clamping and fixing of the connecting flanges 4 and the rotation drive during the welding process.

[0042] First, the operator places the two connecting flanges 4 into the clamping areas of the first flange clamping member 5 and the second flange clamping member 8, respectively. The first connecting flange 4 is placed inside the first fixing ring 507, within the central space enclosed by several first clamping plates 512; the second connecting flange 4 is placed inside the second annular rail 801, within the central space enclosed by several second clamping plates 807. At this point, there is a gap between the outer circumference of the connecting flange 4 and each clamping plate, and it is not yet clamped.

[0043] Subsequently, the operator issues a clamping command through the PLC controller 110. The first telescopic rod 520 is activated, and its telescopic end pushes the first pin 604 through the first pin plate 521, thereby driving the first rotating disk 601 to rotate around the axis of the first L-shaped circular rail 510. Since the first rotating disk 601 has several first arc-shaped grooves 603 on its circumferential side, and each first arc-shaped groove 603 is slidably engaged with the corresponding first lever 513, when the first rotating disk 601 rotates, the curved contour of the first arc-shaped groove 603 forces the first lever 513 to move radially, thereby driving the first radial slide block 511 to slide radially within the first U-shaped plate 509. Each first radial slide block 511 moves towards the center simultaneously, causing the first clamping plate 512 to move radially inward until the multiple first clamping plates 512 uniformly clamp the outer circumferential surface of the first connecting flange 4 from the circumferential direction. Meanwhile, several first protrusions 605 are fixed to the inner wall of the first rotating disk 601, and the first protrusions 605 rotate synchronously with the first rotating disk 601. During the rotation of the first rotating disk 601, the first protrusions 605 sequentially contact and push the first ball 523, and the first ball 523 transmits the thrust to the first L-shaped abutment 518 through the first extension rod 522. After being pushed, the first L-shaped abutment 518 overcomes the elastic force of the first spring 517 and moves towards the inside of the first fixing ring 507 through the first sliding rod 515, so that the first L-shaped abutment 518 abuts against the end face or side of the connecting flange 4 from the other side, realizing auxiliary positioning and anti-loosening. When the first rotating disk 601 stops rotating, the restoring force of the first spring 517 keeps the first L-shaped abutment 518 with appropriate clamping force to ensure stable clamping.

[0044] Synchronous with the clamping action of the first flange clamping member 5, the second telescopic rod 813 extends under the control of the PLC controller 110. Its telescopic end pushes the second pin 811 through the second pin plate 814, causing the second rotating disk 804 to rotate around the axis of the third L-shaped circular rail 803. The second arc-shaped groove 810 on the circumferential side of the second rotating disk 804 slides in cooperation with the second lever 808, driving the second radial slide block 806 to slide radially within the second U-shaped plate 802, causing the second clamping plate 807 to move closer to the center, thereby uniformly clamping the outer circumferential surface of the second connecting flange 4. At the same time, the second protrusion 809 on the inner wall of the second rotating disk 804 pushes the second ball 821, causing the second L-shaped abutment plate 819 to move inward through the second extension rod 820, assisting in pressing the second connecting flange 4 from the end face or side. The second spring 818 provides appropriate cushioning and holding force.

[0045] At this point, the two connecting flanges 4 are firmly clamped by the first flange clamping member 5 and the second flange clamping member 8, respectively, and are coaxially aligned with both ends of the bellows 9. Since the first fixing ring 507 and the first annular rail 508 are rotatably engaged by bearings, and the rotating sleeve 805 at the end of the second annular rail 801 is rotatably engaged with the second L-shaped annular rail 707 by bearings, both connecting flanges 4 can rotate freely around their own axes while clamped. When circumferential welding is required, the PLC controller 110 issues a rotation command, the second brake motor 709 starts operating, and its output shaft drives the rotating gear 710 to rotate. The rotating gear 710 meshes with the annular gear 823 fixed at the end of the second annular rail 801, thereby driving the entire second flange clamping member 8 (including the second annular rail 801, the second clamping plate 807, and the clamped connecting flanges 4) to rotate continuously around its axis.

[0046] Example 3, please refer to Figures 1-14 This third embodiment is an improvement on the first embodiment. Specifically, a vertical side plate 116 is fixed inside the limiting slide 102 at the top of the mounting base 101. A first telescopic cylinder 117 electrically connected to the PLC controller 110 is fixed on the side of the vertical side plate 116. A guide crossbar 118 is fixed below the first telescopic cylinder 117 on the side of the vertical side plate 116. A laser welding slide 119 that slides through the guide crossbar 118 is fixed to the first telescopic cylinder 117. A second telescopic cylinder 120 electrically connected to the PLC controller 110 is fixed to one outer side of the laser welding slide 119. A laser welder 121 electrically connected to the PLC controller 110 is fixed to the telescopic end of the second telescopic cylinder 120.

[0047] The specific application of this embodiment three is as follows: based on the completion of the distance adjustment between the two positioning mechanisms in embodiment one and the completion of the precise clamping and rotation drive of the two connecting flanges 4 in embodiment two, embodiment three further realizes the positioning and welding operation of the laser welder 121, and completes the automatic welding of the joint between the connecting flange 4 and the bellows 9.

[0048] First, the PLC controller 110 determines the target position of the laser welder 121 according to the preset welding program. This position requires that the laser emitter of the laser welder 121 be aligned with the circumferential joint between the connecting flange 4 and the bellows 9, while maintaining the optimal working distance.

[0049] Subsequently, the PLC controller 110 sends a control command to the first telescopic cylinder 117. The piston rod of the first telescopic cylinder 117 begins to extend or retract. Since the cylinder body of the first telescopic cylinder 117 is fixed to the side of the vertical side plate 116, and its piston rod is fixedly connected to the laser welding slide 119, the movement of the piston rod causes the laser welding slide 119 to slide along the axial direction of the guide crossbar 118. The guide crossbar 118 passes through the laser welding slide 119 and provides it with guidance and support, ensuring that the slide moves smoothly and with good straightness. By controlling the stroke of the first telescopic cylinder 117, the laser welding slide 119 is moved to the target position, so that the second telescopic cylinder 120 fixed on the slide and the laser welder 121 are aligned horizontally with the approximate area where the weld is located.

[0050] Then, the PLC controller 110 sends a control command to the second telescopic cylinder 120. The cylinder body of the second telescopic cylinder 120 is fixed to the outer side of the laser welding slide 119, and the laser welder 121 is fixed to its telescopic end. The piston rod of the second telescopic cylinder 120 extends and retracts, driving the laser welder 121 to move in a direction perpendicular to the guide crossbar 118 (i.e., towards or away from the weld seam), thereby bringing the emitter head of the laser welder 121 close to the weld seam surface, achieving the focal distance required for laser welding. This distance is preset by the PLC controller 110 according to preset parameters (such as laser power, material thickness, etc.), and closed-loop adjustment is achieved through the stroke feedback of the telescopic cylinder. When the position of the laser welder 121 is adjusted to the correct position, the PLC controller 110 simultaneously starts the laser welder 121 and the second brake motor 709 (if a circumferential welding process is used). The second brake motor 709 drives the second flange clamping member 8 to rotate the connecting flange 4, causing the weld seam to move in a circular motion relative to the laser welder 121. Simultaneously, the laser welder 121 emits a high-energy laser beam, melting the metal material along the joint direction to achieve continuous circumferential welding. During welding, the PLC controller 110 can monitor the welding status in real time and fine-tune the position of the first telescopic cylinder 117 or the second telescopic cylinder 120 as needed to compensate for thermal deformation or assembly errors, ensuring weld quality. If the welding process requires multi-layer, multi-pass welding or segmented welding, the PLC controller 110 can adjust the longitudinal position of the laser welding slide 119 or the extension length of the laser welder 121 at different time periods according to a preset program, so that the laser beam sequentially covers all areas to be welded until the entire joint is welded. After welding is completed, the PLC controller 110 issues a stop command, the laser welder 121 shuts off its laser output, and the second brake motor 709 stops rotating. Subsequently, the second telescopic cylinder 120 reverses its movement, retracting the laser welder 121 to its initial safe position; the first telescopic cylinder 117 reverses its movement, moving the laser welding slide 119 back to its original position along the guide bar 118, thus making room for subsequent workpiece loading and unloading.

Claims

1. A positioning device for corrugated pipe welding based on aerospace applications, comprising a laser welding mechanism (1), a first positioning mechanism (2) slidably fitted on the laser welding mechanism (1), a second positioning mechanism (3) slidably fitted on the laser welding mechanism (1), two connecting flanges (4) respectively clamping and positioning on the first positioning mechanism (2) and the second positioning mechanism (3), and a corrugated pipe (9) passing through the laser welding mechanism (1), characterized in that: The first positioning mechanism (2) includes a first flange clamping member (5) that slides on the laser welding mechanism (1) and a turntable member (6) that rotates on the first flange clamping member (5). The second positioning mechanism (3) includes a positioning member (7) that slides on the laser welding mechanism (1) and a second flange clamping member (8) that rotates on the positioning member (7). The laser welding mechanism (1) includes a mounting base (101). The top of the mounting base (101) is fixed with a limiting slide (102) that slides with the first flange clamp (5) and the positioning member (7). A baffle (103) is fixed on an outer side of the top of the mounting base (101) away from the limiting slide (102). An arched protective cover (104) connected to the mounting base (101) is fixed on one side of the baffle (103). A rotating shaft roller (105) is rotatably fitted inside the arched protective cover (104) on one side of the baffle (103). A symmetrically distributed curved guide channel (106) is opened on the top of the rotating shaft roller (105), and the two curved guide channels (106) slide with the first flange clamp (5) and the positioning member (7) respectively.

2. The positioning device for corrugated pipe welding based on aerospace as described in claim 1, characterized in that: The arched protective cover (104) has a limiting transverse groove (107) through one side, and a rectangular guide groove (108) parallel to the limiting transverse groove (107) through one outer side of the limiting slide (102). An L-shaped mounting plate (109) is fixed to the other outer side of the limiting slide (102). A PLC controller (110) is fixed to one outer side of the L-shaped mounting plate (109). A vertical plate (111) is fixed to the bottom of the limiting slide (102) between the first positioning mechanism (2) and the second positioning mechanism (3). A sleeve pipe (112) is fixed to the top of the vertical plate (111). The center of the circumferential side of the rotating shaft roller (105) is located between two curved guide channels (106) and a limiting ring (113) is fixed thereon. Both ends of the rotating shaft roller (105) are fixed with limiting circular plates (114). A first brake motor (115) electrically connected to a PLC controller (110) is fixed on one side of the baffle (103). The output shaft of the first brake motor (115) is rotatably connected to the baffle (103), and the output shaft of the first brake motor (115) is fixedly connected to the end of one of the limiting circular plates (114).

3. The positioning device for corrugated pipe welding based on aerospace as described in claim 2, characterized in that: The first flange clamp (5) includes a first U-shaped slide block (501) that is slidably fitted inside the limiting slide (102). The first U-shaped slide block (501) is rotatably fitted inside the first U-shaped slide block (501) and is in contact with the bottom of the limiting slide (102). A first rectangular slider (503) that is slidably fitted inside the rectangular guide groove (108) is fixed on one side of the first walking roller (502). A first round rod (504) that is slidably fitted inside the limiting transverse groove (107) is fixed on one side of the first rectangular slider (503). A first sliding ball (505) that is slidably fitted to one of the curved guide grooves (106) is fixed at the end of the first round rod (504).

4. A positioning device for corrugated pipe welding based on aerospace technology according to claim 3, characterized in that: The positioning component (7) includes a second U-shaped slide block (701) that is slidably fitted inside the limiting slide (102). The second U-shaped slide block (701) is rotatably fitted inside a second traveling roller (702) that is in contact with the bottom of the limiting slide (102). A second rectangular slider (703) that is slidably fitted inside a rectangular guide groove (108) is fixed on one side of the second traveling roller (702). A second round rod (704) that is slidably fitted inside a limiting transverse groove (107) is fixed on one side of the second rectangular slider (703). A second sliding ball (705) that is slidably fitted to another curved guide groove (106) is fixed at the end of the second round rod (704).

5. A positioning device for corrugated pipe welding based on aerospace technology according to claim 4, characterized in that: The first U-shaped slide (501) has a first vertical plate (506) fixed to its top. The top of the first vertical plate (506) has a first fixing ring (507) coaxially arranged with the sleeve (112). The end of the first fixing ring (507) is rotatably fitted with a first annular rail (508) through a bearing. The outer circumferential side of the first annular rail (508) is connected with several first U-shaped plates (509). The several first U-shaped plates (509) are fixed with a first L-shaped annular rail (510) coaxially arranged with the first fixing ring (507). A first radial slide block (511) is radially slidably fitted inside several first U-shaped plates (509). A first clamping plate (512) is fixed inside the first fixing ring (507) at the end of several first radial slide blocks (511). A first lever (513) is fixed on the side of several first radial slide blocks (511).

6. A positioning device for corrugated pipe welding based on aerospace technology according to claim 5, characterized in that: The inner wall of the first fixing ring (507) is fixed with a first L-shaped support plate (514) between two adjacent first clamping plates (512). Two first slide rods (515) are symmetrically arranged and slidably fitted through one outer side of the first L-shaped support plate (514). The ends of the two first slide rods (515) are fixed with a first limiting plate (516) inside the first L-shaped support plate (514). Two first springs (517) are fixed between the first limiting plate (516) and the first L-shaped support plate (514) respectively sleeved on the two first slide rods (515). The ends of the two first slide rods (515) are fixed with a first L-shaped abutment plate (518) outside the first L-shaped support plate (514).

7. A positioning device for corrugated pipe welding based on aerospace technology according to claim 6, characterized in that: The turntable component (6) includes a first rotating disk (601), an annular groove (602) is provided at the end of the first rotating disk (601), the annular groove (602) and the first L-shaped circular rail (510) are rotatably engaged by bearings, a number of first arc-shaped grooves (603) are provided through the peripheral side of the first rotating disk (601) respectively, which are slidably engaged with a number of first levers (513), a first pin (604) is fixed on the opposite end face of the first rotating disk (601), and a number of first protrusions (605) are fixed on the inner wall of the first rotating disk (601). The first L-shaped circular track (510) has a first pin seat (519) fixed on its outer periphery. The first pin seat (519) is rotatably fitted with a first telescopic rod (520) electrically connected to the PLC controller (110). The telescopic end of the first telescopic rod (520) is fixed with a first pin plate (521) rotatably fitted with the first pin (604). A number of first L-shaped abutments (518) have first extension rods (522) fixed on their sides. The ends of the first extension rods (522) are fixed with first spheres (523) slidably fitted with the first rotating disk (601) and the first protrusion (605). The second U-shaped slide (701) has a second vertical plate (706) fixed to its outer top, and the second vertical plate (706) has a second L-shaped ring rail (707) coaxially arranged with the sleeve (112) fixed to its top.

8. A positioning device for corrugated pipe welding based on aerospace technology according to claim 7, characterized in that: The second flange clamping member (8) includes a second annular rail (801), and a plurality of second U-shaped plates (802) are connected to the outer periphery of the second annular rail (801). A third L-shaped annular rail (803) coaxially arranged with the second annular rail (801) is fixed between the plurality of second U-shaped plates (802). A second rotating disk (804) is rotatably fitted at the end of the third L-shaped annular rail (803) through a bearing. A rotating sleeve (805) is fixed at the end of the second annular rail (801). The rotating sleeve (805) is rotatably fitted with the second L-shaped annular rail (707) through a bearing. A number of second radial slides (806) are radially slidingly fitted inside the second U-shaped plates (802), and a second clamping plate (807) is fixed at the end of the second radial slides (806) inside the second annular rail (801). A second lever (808) is fixed on the side of each of the second radial slides (806). The inner wall of the second rotating disk (804) is fixed with several second protrusions (809). The circumferential side of the second rotating disk (804) is provided with several second arc-shaped grooves (810) that slide with several second levers (808). The end face of the second rotating disk (804) is fixed with a second pin (811). The outer circumferential side of the third L-shaped ring rail (803) is fixed with a second pin seat (812). The second pin seat (812) is rotatably fitted with a second telescopic rod (813) that is electrically connected to the PLC controller (110). The telescopic end of the second telescopic rod (813) is fixed with a second pin plate (814) that rotatably fits with the second pin (811).

9. A positioning device for corrugated pipe welding based on aerospace technology according to claim 8, characterized in that: The inner wall of the second annular rail (801) is fixed with a second L-shaped support plate (815) between two adjacent second clamping plates (807). Two symmetrically arranged second slide rods (816) are slidably fitted through one outer side of the second L-shaped support plate (815). The ends of the two second slide rods (816) are fixed with a second limiting plate (817) inside the second L-shaped support plate (815). Two second springs (818) are fixed between the second limiting plate (817) and the second L-shaped support plate (815), respectively sleeved and fitted on the two second slide rods (816). The ends of the two second slide rods (816) are fixed with a second L-shaped abutment plate (819) outside the second L-shaped support plate (815). A second extension rod (820) is fixed on the side of several second L-shaped abutments (819). The ends of the second extension rods (820) are fixed with a second ball (821) that slidably fits with the second rotating disk (804) and the second protrusion (809). An extension plate (822) is fixed at the end of the second annular rail (801) between two adjacent second protrusions (809), and an annular gear (823) is fixed at the end of the extension plate (822) and is coaxially arranged with the second annular rail (801). The second vertical plate (706) has an L-shaped motor base (708) fixed on its side near the bottom. The L-shaped motor base (708) has a second brake motor (709) that is electrically connected to the PLC controller (110) fixed on one outer side. The output shaft of the second brake motor (709) has a rotating gear (710) that meshes with the ring gear (823).

10. A positioning device for corrugated pipe welding based on aerospace technology according to claim 2, characterized in that: The top of the mounting base (101) is fixed inside the limiting slide (102) with a vertical side plate (116). A first telescopic cylinder (117) electrically connected to the PLC controller (110) is fixed on the side of the vertical side plate (116). A guide bar (118) is fixed below the first telescopic cylinder (117) on the side of the vertical side plate (116). A laser welding slide (119) that slides through the guide bar (118) is fixed on the first telescopic cylinder (117). A second telescopic cylinder (120) electrically connected to the PLC controller (110) is fixed on one outer side of the laser welding slide (119). A laser welder (121) electrically connected to the PLC controller (110) is fixed on the telescopic end of the second telescopic cylinder (120).

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