Flame brazing device for oxygen guide pipe of airplane

Abstract

The invention discloses an aircraft oxygen conduit flame brazing device, which belongs to the field of flame brazing, and comprises a ceramic fence, an annular air passage, a welding bracket, a conduit clamping mechanism and a welding nozzle, a cylindrical platform is arranged at the center of the welding bracket to fix an oxygen conduit head, and the height of the welding bracket can be adjusted; the two guide pipe clamping mechanisms are symmetrically installed on the two sides of the cylindrical platform to clamp an oxygen guide pipe body so that the oxygen guide pipe body can be coaxial with a pipe head, the upper end of the welding support is fixedly connected with the annular air channel, the multiple welding pipe nozzles are evenly arranged on the annular air channel, the air outlet direction is inclined downwards, and the welding pipe nozzles are concentrated at one point so that heating can be even. And flame overflow is prevented. Welding and clamping are integrated, the number of auxiliary welding personnel can be reduced, the production efficiency is improved, and the oxygen guide pipe welding quality is improved.

Description

Technical Field

[0001] The invention belongs to the field of flame brazing, and in particular relates to a flame brazing device for an aircraft oxygen conduit. Background Art

[0002] With the rapid development of my country's aviation industry, the number of routine maintenance and repairs of aircraft has gradually increased. Among them, the maintenance of oxygen ducts is of paramount importance. The quality of oxygen ducts is directly related to whether the aircraft's oxygen supply system can be used normally, and is closely related to the personal safety of pilots. Flame brazing is the key technology to connect the oxygen duct head and the tube body. The connection quality between the tube head and the tube body is directly related to the airtightness of the oxygen duct. At present, when using flame brazing to weld the tube head and the tube body, it requires the cooperation of multiple people to complete the welding operation. The initial positioning of the tube head and the tube body requires manual positioning, and this process cannot ensure that the tube head and the tube body are coaxial. On the other hand, because the welding gun is manually held and the flame of the welding nozzle is dispersed, it is impossible to ensure that the connection between the tube head and the tube body is heated evenly during welding, which will cause stress concentration and even cracks in the weld area, burying safety hazards for the use of oxygen ducts. Summary of the invention

[0003] In order to solve the technical problems existing in the prior art, the present invention provides an aircraft oxygen duct flame brazing device, which integrates oxygen duct flame brazing welding and clamping, can reduce the number of auxiliary welding personnel, improve production efficiency, and enhance the welding quality of oxygen duct.

[0004] The present invention adopts the following technical solution:

[0005] A flame brazing device for aircraft oxygen ducts, the flame brazing device comprising a ceramic enclosure 1, an annular airway 2, a welding bracket 3, a duct clamping mechanism 4 and a welding nozzle 5. The welding bracket 3 is used to fix the oxygen duct head at its central position, and the duct clamping mechanism 4 is provided at both ends of the oxygen duct head clamping position, which is used to clamp the oxygen duct body and make it coaxial with the head. The annular airway 2 is fixed on the welding bracket 3, and a plurality of welding nozzles 5 are evenly distributed and connected to the annular airway 2, so that the flame is concentrated at one point, and the ceramic enclosure 1 surrounds the welding bracket 3 to prevent the flame from overflowing.

[0006] The welding bracket 3 comprises a pillar 3-1, a square base 3-2, a cylindrical platform 3-3, a small cylindrical platform 3-4 and a limiting bolt 3-5; the square base 3-2 is located at the bottom of the welding bracket 3, and a plurality of pillars 3-1 are provided, which are evenly distributed and fixedly connected to the edge of the square base 3-2; the cylindrical platform 3-3 is a hollow cylinder, which is fixedly connected to the center position of the square base 3-2, and a plurality of through holes 3-6 are vertically arranged on the upper part of its side wall, and a spacing is left between the through holes 3-6; the small cylindrical platform 3-4 is also a hollow cylinder, and the slot hole on its top is used to fix the oxygen conduit head, the outer diameter of the small cylindrical platform 3-4 is smaller than the inner diameter of the cylindrical platform 3-3, and it is inserted into the cylindrical platform 3-3, and the limiting bolt 3-5 cooperates with the through hole 3-6 on the side wall of the cylindrical platform 3-3 to fix the length of the small cylindrical platform 3-4 extending out of the cylindrical platform 3-3, so as to adjust the oxygen conduit head to be welded to a suitable welding position.

[0007] The catheter clamping mechanism 4 is provided with two groups of identical structures, which are symmetrically fixed on both sides of the cylindrical platform 3-3 on the square base 3-2. Each group of catheter clamping mechanism 4 includes a catheter fixer 4-1, a cylindrical bracket 4-2 and a spring assembly 4-3; the lower end of the cylindrical bracket 4-2 is fixed on the square base 3-2, and the catheter fixer 4-1 is installed on the upper side through the spring assembly 4-3. The catheter fixers 4-1 of the two groups of catheter clamping mechanisms 4 are opposite to each other, and the end faces of the opposite sides of the two are arc-shaped, which are used to clamp and tighten the oxygen catheter body through the spring force, and ensure that the oxygen catheter body after clamping and tightening is coaxially matched with the oxygen catheter head fixed by the small cylindrical platform 3-4.

[0008] The annular airway 2 is a hollow annular pipe, which is fixed on the four pillars 3-1 of the welding bracket 3. A plurality of air outlets 2-1 are evenly arranged on the inner circle of the pipe wall, which are provided with external threads for connecting the welding nozzles 5 respectively. The air outlets 2-1 discharge air obliquely downward so that the flames of all welding nozzles 5 are concentrated from all sides to one point to ensure uniform heating. An air inlet 2-3 is opened on the outer circle of the annular airway 2. A threaded through hole is formed on the pipe wall of the air inlet 2-3 for setting an airflow control mechanism 2-2 to control the air intake amount. The main body of the airflow control mechanism 2-2 is a spherical structure with a circular through hole. A rotating bolt is fixed on the upper part of the spherical structure. The outer diameter of the spherical structure matches the inner diameter of the air inlet 2-3. The spherical structure is placed in the air inlet 2-3. The rotating bolt matches the threaded through hole on the air inlet 2-3. The spherical structure is driven to rotate by turning the rotating bolt, so that the gas flow into the annular airway 2 can be accurately controlled.

[0009] The welding nozzle 5 is internally provided with a threaded connection area 5-1, a gas buffer area 5-2 and a tapered air channel 5-3 which are connected in sequence; the threaded connection area 5-1 is located at the tail of the welding nozzle 5 and is used to be installed on the gas outlet 2-1 on the annular gas channel 2; the tapered air channel 5-3 is a smooth gas channel with a wide gas inlet and a narrow gas outlet; the gas buffer area 5-2 is a tapered connection surface, which is used for the connection transition between the threaded connection area 5-1 and the tapered air channel 5-3; the mixed gas is fully mixed and concentrated inside the welding nozzle 5, so that the ejected flame is in a clustered state.

[0010] The ceramic enclosure 1 is an arc-shaped enclosure, with two having the same structure, which surround the periphery of the welding bracket 3 from both sides, and the two are closed to form a circular enclosure to prevent the flame from overflowing; the middle area of ​​the outer side of the ceramic enclosure 1 is equipped with an ear handle for handholding.

[0011] Beneficial effects of the present invention:

[0012] 1. Simple structure, easy operation, improved efficiency of oxygen conduit flame brazing, and improved welding quality of oxygen conduits;

[0013] 2. The welding nozzle adopts a conical airway inside, and the apertures of the air inlet and outlet have also been strictly modified to ensure that the airflow is concentrated and not dispersed. In addition, the annular airway structure is cleverly designed and has high reliability;

[0014] 3. The catheter clamping mechanism is a device for fixing the catheter, which effectively ensures the coaxiality of the catheter and the pipe head during welding, which is thoughtful;

[0015] 4. The four-nozzle tilt design allows the flames of the four nozzles to be concentrated on one point from all sides, effectively ensuring that the pipe and the pipe head are heated evenly during the flame brazing process to reduce stress concentration;

[0016] 5. The use of a liftable cylindrical platform can effectively clamp catheters of different lengths, which is thoughtful. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of a flame brazing device for an aircraft oxygen duct according to the present invention;

[0018] Figure 2 This is a schematic diagram of the welding bracket structure of a flame brazing device for an aircraft oxygen duct according to the present invention;

[0019] Figure 3 It is a schematic diagram of the structure of a tube clamping mechanism of a flame brazing device for an aircraft oxygen tube of the present invention;

[0020] Figure 4The present invention is a schematic diagram of a welding nozzle structure of an aircraft oxygen duct flame brazing device, wherein (a) is an overall schematic diagram, and (b) is an AA cross-sectional view;

[0021] In the figure: 1 ceramic enclosure; 2 annular airway; 3 welding bracket; 4 catheter clamping mechanism; 5 welding nozzle; 2-1 air outlet; 2-2 airflow control mechanism; 2-3 air inlet; 3-1 support; 3-2 square base; 3-3 cylindrical platform; 3-4 small cylindrical platform; 3-5 limit bolt; 3-6 through hole; 4-1 catheter holder; 4-2 cylindrical bracket; 4-3 spring assembly; 5-1 threaded connection area; 5-2 gas buffer zone; 5-3 conical airway. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the specific implementation methods of the present invention will be described in detail below with reference to the technical solution.

[0023] A flame brazing device for aircraft oxygen ducts, the flame brazing device comprising a ceramic enclosure 1, an annular airway 2, a welding bracket 3, a duct clamping mechanism 4 and a welding nozzle 5, such as Figure 1 shown.

[0024] like Figure 2 As shown, the welding bracket 3 includes a pillar 3-1, a square base 3-2, a cylindrical platform 3-3, a small cylindrical platform 3-4 and a limit bolt 3-5; the square base 3-2 is located at the bottom of the welding bracket 3, and its four corners are threaded holes for fixing the entire flame brazing device on the ground; there are four pillars 3-1, which are evenly distributed and welded at the edge of the square base 3-2; the cylindrical platform 3-3 is a hollow cylinder, which is welded at the center of the square base 3-2, and the upper part of its side wall is provided with 4 through holes 3-6 at vertical intervals, and the cylindrical platform There are two threaded holes on the square base 3-2 on both sides of the platform 3-3, and the two threaded holes are arranged symmetrically; the small cylindrical platform 3-4 is also a hollow cylinder, and the slot on its top is used to fix the oxygen conduit head. The outer diameter of the small cylindrical platform 3-4 is smaller than the inner diameter of the cylindrical platform 3-3. It is inserted into the cylindrical platform 3-3 and can adjust the length of the device extending out of the cylindrical platform 3-3. The limit bolt 3-5 is screwed into the through hole 3-6 at the corresponding position on the side wall of the cylindrical platform 3-3 to fix the small cylindrical platform 3-4, so that the oxygen conduit head to be welded is fixed in a suitable welding position.

[0025] like Figure 3As shown, the catheter clamping mechanism 4 is provided with two groups with the same structure, and each group of the catheter clamping mechanism 4 includes a catheter fixer 4-1, a cylindrical bracket 4-2 and a spring assembly 4-3; the lower end of the cylindrical bracket 4-2 is made of external thread, and the lower ends of the cylindrical brackets 4-2 of the two groups of catheter clamping mechanisms 4 are fixedly connected to the threaded holes on both sides of the cylindrical platform 3-3 on the square base 3-2 through threaded cooperation, and the catheter fixer 4-1 is installed on the side of the upper end of the cylindrical bracket 4-2 through the spring assembly 4-3. The catheter fixers 4-1 of the two groups of catheter clamping mechanisms 4 are opposite to each other, and the end faces of the opposite sides of the two are arc-shaped, which are used to clamp and tighten the oxygen catheter body through spring force, and ensure that the oxygen catheter body after clamping and tightening is coaxially matched with the oxygen catheter head fixed by the small cylindrical platform 3-4.

[0026] The annular airway 2 is a hollow annular pipe, which is welded on the four pillars 3-1 of the welding bracket 3. Four air outlets 2-1 are evenly arranged on the inner circle of the pipe wall. The pipe wall is provided with external threads for connecting welding nozzles 5 respectively. The air outlets 2-1 exhaust air obliquely downward so that the flames of the four welding nozzles 5 connected thereto are concentrated from all sides to one point to ensure uniform heating. The outer circle of the annular airway 2 is provided with an air inlet 2-3. The pipe wall of the air inlet 2-3 is provided with a threaded through hole for setting an airflow control mechanism 2-2 to control the air intake amount. The main body of the airflow control mechanism 2-2 is a spherical structure with a circular through hole. A rotating bolt is fixed on the upper part of the spherical structure. The outer diameter of the spherical structure matches the inner diameter of the air inlet 2-3. The spherical structure is placed in the air inlet 2-3. The rotating bolt matches the threaded through hole on the air inlet 2-3. The spherical structure is driven to rotate by turning the rotating bolt, so that the gas flow rate flowing into the annular airway 2 can be accurately controlled.

[0027] like Figure 4 As shown, there are four welding nozzles 5, which are respectively installed on four air outlets 2-1, and are provided with a threaded connection area 5-1, a gas buffer area 5-2 and a tapered air duct 5-3 which are connected in sequence; the threaded connection area 5-1 is located at the tail of the welding nozzle 5, and is used to be installed on the air outlet 2-1 on the annular air duct 2, the tapered air duct 5-3 is a smooth air duct with a wide air inlet and a narrow air outlet, and the gas buffer area 5-2 is a tapered connection surface, which is used for the connection transition between the threaded connection area 5-1 and the tapered air duct 5-3, and the mixed gas is fully mixed and concentrated inside the welding nozzle 5, so that the ejected flame is in a clustered state.

[0028] The ceramic enclosure 1 is an arc-shaped enclosure, and there are two of them with the same structure. The two surround the periphery of the welding bracket 3 from both sides, and the two are closed to form a ring enclosure to prevent the flame from overflowing. The middle area of ​​the outer side of the two ceramic enclosures 1 is equipped with ear handles for hand holding.

[0029] When in use, fix the oxygen conduit head in the slot on the top of the small cylindrical platform 3-4, adjust the position of the small cylindrical platform 3-4, and fix it to the appropriate position through the limit bolts 3-5, clamp the oxygen conduit body between the two conduit clamping mechanisms 4, at this time, the oxygen conduit head is coaxial with the body, and adjust the oxygen conduit body to a suitable height; ventilate the annular airway 2, and adjust the air intake flow through the airflow control mechanism 2-2, start the welding operation, and surround the two ceramic enclosures 1 outside the welding bracket 3 to prevent the flame from spilling out.

Claims

1. A flame brazing device for aircraft oxygen ducts, characterized in that: The flame brazing device comprises a ceramic enclosure (1), an annular airway (2), a welding bracket (3), a catheter clamping mechanism (4) and a welding nozzle (5); the welding bracket (3) is used to fix the oxygen catheter tube head at its central position, and catheter clamping mechanisms (4) are arranged at both ends of the oxygen catheter tube head clamping position to clamp the oxygen catheter tube body and make it coaxial with the tube head; the annular airway (2) is fixed on the welding bracket (3), and a plurality of welding nozzles (5) are evenly distributed and connected to the annular airway (2) so that the flame is concentrated at one point; the ceramic enclosure (1) surrounds the welding bracket (3) to prevent the flame from overflowing.

2. The flame brazing device for aircraft oxygen duct according to claim 1, characterized in that: The specific structure of the flame brazing device is as follows: The welding bracket (3) comprises a pillar (3-1), a square base (3-2), a cylindrical platform (3-3), and a small cylindrical platform (3-4); the square base (3-2) is located at the bottom of the welding bracket (3); a plurality of pillars (3-1) are provided, which are evenly distributed and fixedly connected to the edge of the square base (3-2); the cylindrical platform (3-3) is a hollow cylinder, which is fixedly connected to the center of the square base (3-2); the small cylindrical platform (3-4) is also a hollow cylinder, and the slot hole on the top is used to fix the oxygen conduit head. The small cylindrical platform (3-4) is inserted into the cylindrical platform (3-3), and the extension length of the small cylindrical platform (3-4) can be adjusted and fixed, so as to adjust the oxygen conduit head to be welded to a suitable welding position; The catheter clamping mechanism (4) is provided with two groups of identical structures, which are symmetrically fixed on both sides of the cylindrical platform (3-3) on the square base (3-2), and each group of the catheter clamping mechanism (4) comprises a catheter fixer (4-1), a cylindrical bracket (4-2) and a spring assembly (4-3); the lower end of the cylindrical bracket (4-2) is fixed on the square base (3-2), and the catheter fixer (4-1) is installed on the side surface of the upper end thereof through the spring assembly (4-3); the catheter fixers (4-1) of the two groups of the catheter clamping mechanism (4) are opposite to each other, and the oxygen catheter body is clamped and fastened by the spring force, and the clamped and fastened oxygen catheter body is coaxially matched with the oxygen catheter head fixed by the small cylindrical platform (3-4); The annular airway (2) is a hollow annular pipe, which is fixed on four pillars (3-1) of the welding bracket (3). A plurality of air outlets (2-1) are evenly arranged on the inner circle of the pipe wall, which are used to connect the welding nozzles (5) respectively. The air outlets (2-1) discharge air obliquely downward, so that the flames of all welding nozzles (5) are concentrated from all sides to one point to ensure uniform heating. The outer circle of the annular airway (2) is provided with an air inlet (2-3); The ceramic enclosure (1) is an arc-shaped enclosure, and there are two of them with the same structure. The two surround the periphery of the welding bracket (3) from both sides, and the two are combined to form an annular enclosure to prevent the flame from overflowing.

3. The flame brazing device for aircraft oxygen duct according to claim 2, characterized in that: A plurality of through holes (3-6) are vertically arranged on the upper side wall of the cylindrical platform (3-3), with spacing between the through holes (3-6) cooperating with limiting bolts (3-5) to fix the length of the small cylindrical platform (3-4) extending out of the cylindrical platform (3-3).

4. The flame brazing device for aircraft oxygen duct according to claim 2, characterized in that: An airflow control mechanism (2-2) is provided at the air inlet (2-3) to control the air intake volume, and a threaded through hole is formed on the tube wall of the air inlet (2-3) for cooperating with the airflow control mechanism (2-2); the main body of the airflow control mechanism (2-2) is a spherical structure with a circular through hole, and a rotating bolt is fixed on the upper part of the spherical structure. The outer diameter of the spherical structure matches the inner diameter of the air inlet (2-3), and the spherical structure is placed in the air inlet (2-3). The rotating bolt cooperates with the threaded through hole on the air inlet (2-3), and the gas flow into the annular airway (2) is controlled by turning the rotating bolt.

5. The aircraft oxygen duct flame brazing device according to claim 2, characterized in that: The welding nozzle (5) is internally provided with a threaded connection area (5-1), a gas buffer area (5-2) and a tapered air channel (5-3) which are connected in sequence; the threaded connection area (5-1) is located at the rear of the welding nozzle (5) and is used to be installed on the gas outlet (2-1) on the annular gas channel (2); the tapered air channel (5-3) is a smooth gas channel with a wide gas inlet and a narrow gas outlet; the gas buffer area (5-2) is a tapered connection surface, which is used for the connection transition between the threaded connection area (5-1) and the tapered air channel (5-3); the mixed gas is mixed and concentrated inside the welding nozzle (5), so that the ejected flame is in a clustered state.

6. The aircraft oxygen duct flame brazing device according to claim 2, characterized in that: The middle area of ​​the outer side of the ceramic enclosure (1) is provided with an ear handle for hand-holding.

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