Positioning clamp of airplane static discharger and brazing method

Abstract

The invention relates to the technical field of aircraft manufacturing, in particular to a positioning clamp and a brazing method for an aircraft static discharger, and the positioning clamp comprises a clamp mold, a plate pressing assembly and a needle pressing assembly; the top of the clamp mold is of a stepped structure and is provided with a plate positioning groove used for containing a mounting plate and a needle positioning groove used for containing a spray point. The plate pressing assembly is detachably connected with the clamp mold and used for pressing the mounting plate. The needle pressing assembly is detachably connected with the clamp mold and used for pressing the spray points. According to the technical scheme, it can be effectively guaranteed that the static discharger is fixed and clamped, the problems of position precision and welding gaps generated by the static discharger during brazing are solved, the advantages of being high in brazing joint quality, low in production cost and suitable for batch production are achieved, and connection and use of the static discharger on an airplane are met.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft manufacturing, and in particular to a positioning fixture and a brazing method for an aircraft static discharger. Background Art

[0002] Aircraft static dischargers are used to discharge static electricity generated during flight. Due to the performance requirements of the dischargers, aircraft static dischargers are usually made of the same or different carbon steel materials and consist of a mounting plate and a discharge needle. The common connection methods between the mounting plate and the discharge needle are bonding or welding. These two connection methods have the following problems during the processing and service of static dischargers:

[0003] 1) Bonding: The bonding medium mainly adopts conductive glue, which has low strength and is prone to connection point detachment during service, resulting in a short service life. At the same time, this connection method has limitations on the structural design of the electrostatic discharger.

[0004] 2) Welding: The diameter of the discharge needle of the static discharger is generally not more than 2mm. Among various welding methods, the same or different carbon steel materials are mainly suitable for gas welding and brazing methods. However, gas welding has large heat input, large weld width and excess height, which does not meet the design flatness requirements and affects the conductive performance of the discharge needle in the static discharger.

[0005] 3) Brazing: Manual brazing cannot be performed by positioning welding before brazing. In addition, the discharge needle and the mounting plate are in close proximity to line contact. During the solidification of the brazing material, the discharge needle is prone to slipping, which changes the brazing clearance, affects the strength of the connection joint, and easily leads to excessive accuracy of the discharge needle position. Generally, a positioning fixture can be used for fixing, but the steel material commonly used in the fixture has fast thermal conductivity, and the size of the static discharger is small. The brazed joint is prone to insufficient heating, resulting in an uneven surface of the brazed weld, low joint strength, and easy to fall off during service. When brazing, it is essential to apply a brazing flux to the area to be welded. Most brazing fluxes are corrosive and difficult to clean after welding, which can easily cause corrosion and rust on the steel fixture, greatly reducing the service life of the fixture.

[0006] The above problems limit the use of brazing on electrostatic dischargers. Summary of the invention

[0007] In view of the deficiencies in the above-mentioned prior art, the present invention discloses a positioning fixture and a brazing method for an aircraft static discharger, which are used to solve the problems of discharge needle slippage caused by manual fixed assembly and insufficient joint heating resulting in low strength, easy falling off and excessive position accuracy of the brazed joint, and provides a reliable technical solution for the stable connection of the static discharger joint on the aircraft. Furthermore, the positioning fixture made of bakelite material has a longer service life.

[0008] The above objectives are achieved specifically through the following technical solutions:

[0009] A positioning fixture for an aircraft static discharger, wherein the aircraft static discharger comprises a mounting plate, one side of which is provided with three grooves, and three discharge needles are welded in the three grooves in a one-to-one correspondence. The positioning fixture comprises a fixture mold, a plate pressing assembly and a needle pressing assembly. The top of the fixture mold is arranged in a stepped structure, and from left to right are a first-level platform, a second-level platform, a third-level platform and a fourth-level platform; wherein the height difference between the first-level platform and the fourth-level platform is 0, the height difference between the first-level platform and the second-level platform is H2, and the height difference between the first-level platform and the third-level platform is H1, and 0

[0010] Preferably, let the thickness of the mounting plate be h2, and let the vertical dimension of the discharge needle when it is laid flat be h1, then H2<h2,h2≤H3.

[0011] Preferably, the plate clamping assembly includes a first pressure plate and at least one first bolt member; a first threaded hole corresponding to the first bolt member is opened on the first-level platform; the first bolt member cooperates with the first threaded hole so that the first pressure plate clamps the mounting plate.

[0012] Preferably, the needle pressing assembly includes a second pressing plate and at least one second bolt member; a second threaded hole corresponding to the second bolt member is opened on the three-level platform; the second bolt member cooperates with the second threaded hole so that the second pressing plate presses the discharge needle.

[0013] Preferably, the cross section of the needle positioning groove is "V"-shaped.

[0014] Preferably, the common edge of the four-level platform and the three-level platform is provided with three-level stepped positioning surfaces corresponding to the three needle positioning grooves one by one, and all the stepped positioning surfaces are parallel to each other.

[0015] Preferably, the needle positioning groove is a linear structure, and the three needle positioning grooves are parallel to each other and are arranged at equal intervals.

[0016] Preferably, the mold is made of bakelite.

[0017] A brazing method for an aircraft static discharger, using the above-mentioned positioning fixture for the aircraft static discharger, comprises the following steps:

[0018] S1, prepare the welding parts of the aircraft static discharger, including a mounting plate and three discharge needles, wherein three grooves are processed on the mounting plate;​

[0019] S2, placing the positioning fixture on a workbench and cleaning the top of the positioning fixture;

[0020] S4, placing the mounting plate in the panel positioning groove with the side of the mounting plate provided with the groove facing upwards;

[0021] S5, placing the three discharge needles in the three needle positioning grooves and the three grooves one by one; that is, for each single discharge needle, one end thereof is placed in the corresponding needle positioning groove, and the other end thereof is placed in the corresponding groove;

[0022] S6, using a plate pressing assembly and a needle pressing assembly to respectively press and fix the mounting plate and all discharge needles;

[0023] S7, applying flux to the area to be welded between the mounting plate and the discharge needle, and welding the three discharge needles to the mounting plate in sequence by soft soldering;

[0024] S8, after brazing is completed, use hot water to clean the residual flux and grind the weld nodules.

[0025] Preferably, in step S4, after the discharge needle is placed, the gap between the discharge needle and the corresponding groove on the mounting plate is not less than 0.5 mm, and the highest point of the surface of the discharge needle is not higher than the upper surface of the mounting plate.

[0026] Preferably, in step S1, the groove on the mounting plate is machined with positive tolerance.

[0027] Beneficial technical effects brought by the present invention:

[0028] 1) This technical solution specially sets up a positioning fixture for the welding process of aircraft static dischargers. In addition to the plate positioning grooves and needle positioning grooves on the fixture mold of the positioning fixture for rapid positioning of the mounting plate and the discharge needle, the top of the fixture mold is also set in a stepped structure to control the relative position between the mounting plate and the discharge needle from the spatial layout, and prevent adhesion between the aircraft static discharger and the positioning fixture during brazing.

[0029] 2) The technical solution proposes a positioning fixture and brazing method for an aircraft electrostatic discharger, which has structural characteristics such as gradient and local V-groove. It has a simple structure and is easy to process and operate. It can effectively ensure the fixation and clamping of the electrostatic discharger and solve the problems of position accuracy and welding gap generated by the electrostatic discharger during brazing.

[0030] 3) The technical solution proposes a positioning fixture and brazing method for an aircraft static discharger. The fixture mold material of the positioning fixture is bakelite. Compared with the commonly used steel material, it can effectively solve the problem of insufficient heating of the connection joint and reduce the risk of the connection joint falling off, making the quality of the static discharger brazing joint stable and reliable. At the same time, this positioning fixture is anti-corrosion and rust-resistant and has a long service life.

[0031] 4) The technical solution proposes a positioning fixture and brazing method for an aircraft electrostatic discharger, in which the groove depth dimension of the mounting plate is controlled to a positive tolerance, thereby improving the bottom quality of the brazing weld and meeting the requirements for the flatness of the electrostatic discharger assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the axial structure of the positioning fixture;

[0033] Figure 2 This is a schematic diagram of the arrangement of welding parts for aircraft static dischargers;

[0034] Figure 3 for Figure 2 BB section diagram in FIG.

[0035] Figure 4 Schematic diagram of the positioning fixture for clamping the welding parts of the aircraft static discharger;

[0036] Figure 5 This is a schematic diagram of the structure of the aircraft static discharger after welding;

[0037] Figure 6 for Figure 5 Schematic diagram of the AA section in .

[0038] In the figure:

[0039] 1. Mounting plate; 1.1. Groove; 2. Discharge needle; 3. Fixture mold; 3.1. First-level platform; 3.2. Second-level platform; 3.3. Third-level platform; 3.4. Fourth-level platform; 4. Plate positioning groove; 5. Needle positioning groove; 6. First threaded hole; 7. Second threaded hole; 8. First pressure plate; 9. First bolt member; 10. Second pressure plate; 11. Second bolt member; 12. Step positioning surface. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0041] Therefore, the following detailed description of the invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] Example 1

[0043] This embodiment discloses a positioning fixture for an aircraft static discharger, wherein: Figure 5 As shown, the aircraft static discharger includes a mounting plate 1, one side of which is provided with three grooves 1.1, and three discharge needles 2 are welded in the three grooves 1.1 one by one. As a preferred embodiment of the present invention, the positioning fixture includes a fixture mold 3, a plate pressing assembly and a needle pressing assembly. Figure 1 As shown, the top of the fixture mold 3 is arranged in a stepped structure, and from left to right are the first-level platform 3.1, the second-level platform 3.2, the third-level platform 3.3 and the fourth-level platform 3.4. Further, the height difference between the first-level platform 3.1 and the fourth-level platform 3.4 is 0, the height difference between the first-level platform 3.1 and the second-level platform 3.2 is H2, and the height difference between the first-level platform 3.1 and the third-level platform 3.3 is H1, and 0

[0044] A plate positioning groove 4 for placing the mounting plate 1 is provided on the first-level platform 3.1, and the depth of the plate positioning groove 4 is H3, and H2<H3; three needle positioning grooves 5 for placing three discharge needles 2 in a one-to-one correspondence are provided on the third-level platform 3.3; the plate clamping assembly is detachably connected to the fixture mold 3 for clamping the mounting plate 1; the needle clamping assembly is detachably connected to the fixture mold 3 for clamping the discharge needle 2.

[0045] The present technical solution specially sets up a positioning fixture for the welding process of the aircraft static discharger. In addition to being provided with a plate positioning groove 4 and a needle positioning groove 5 for quickly positioning the mounting plate 1 and the discharge needle 2 on the fixture mold 3 of the positioning fixture, the top of the fixture mold 3 is also set in a stepped structure, so as to control the relative position between the mounting plate 1 and the discharge needle 2 from the spatial layout, and prevent adhesion between the aircraft static discharger and the positioning fixture during the brazing process.

[0046] Example 2

[0047] This embodiment discloses a positioning fixture for an aircraft static discharger, as a preferred embodiment of the present invention, that is, based on embodiment 1, as shown in FIG. Figure 3 As shown, let the thickness of the mounting plate be h2, let the vertical dimension of the discharge needle when it is laid flat be h1, then ​H2<h2, h2≤H3. In this way, the reliability of the clamping of the mounting plate 1 and the discharge needle 2 can be improved to a certain extent.

[0048] Example 3

[0049] The present embodiment discloses a positioning fixture for an aircraft static discharger, as a preferred implementation mode of the present invention, that is, based on Embodiment 1 or 2, its plate clamping assembly includes a first pressure plate 8 and at least one first bolt member 9; a first threaded hole 6 corresponding to the first bolt member 9 is opened on the first-level platform 3.1; the first bolt member 9 cooperates with the first threaded hole 6 so that the first pressure plate 8 presses the mounting plate 1.

[0050] Correspondingly, the needle pressing assembly includes a second pressing plate 10 and at least one second bolt member 11; a second threaded hole 7 corresponding to the second bolt member 11 is opened on the third-level platform 3.3; the second bolt member 11 cooperates with the second threaded hole 7 so that the second pressing plate 10 presses the discharge needle 2.

[0051] Further, combined with Figure 2 and Figure 4 As shown, the needle clamping assembly includes two second bolts 11, and correspondingly, two second threaded holes 7 are provided on the three-level platform 3.3, and there is a second threaded hole 7 between each two adjacent needle positioning grooves 5. Based on this, two second bolts 11 are tightened, and the second pressing plate 10 is used to press the three discharge needles 2, which effectively prevents the discharge needles 2 from sliding during the solidification of the solder, and ensures that the relative positions of the three discharge needles 2 remain unchanged. Furthermore, the size of the second pressing plate 10 is limited according to the size of the aircraft static discharger, such as the length of the second pressing plate 10 is not less than 50mm and the width is not less than 20mm.

[0052] The plate pressing assembly and the needle pressing assembly of the above structure have simple structure and are easy to operate.

[0053] Example 4

[0054] The present embodiment discloses a positioning fixture for an aircraft static discharger as a preferred implementation of the present invention, that is, based on Embodiment 1, 2 or 3, the common edge of the four-level platform 3.4 and the three-level platform 3.3 is provided with a three-level stepped positioning surface 12 corresponding to the three needle positioning grooves 5, and all the stepped positioning surfaces 12 are parallel to each other.

[0055] Example 5

[0056] This embodiment discloses a positioning fixture for an aircraft static discharger, wherein: Figure 5As shown, the aircraft static discharger includes a mounting plate 1, one side of which is provided with three grooves 1.1, and three discharge needles 2 are welded in the three grooves 1.1 one by one. As a preferred embodiment of the present invention, the positioning fixture includes a fixture mold 3, a plate pressing assembly and a needle pressing assembly. Figure 1 As shown, the top of the fixture mold 3 is arranged in a stepped structure, and from left to right are the first-level platform 3.1, the second-level platform 3.2, the third-level platform 3.3 and the fourth-level platform 3.4. Further, the height difference between the first-level platform 3.1 and the fourth-level platform 3.4 is 0, the height difference between the first-level platform 3.1 and the second-level platform 3.2 is H2, and the height difference between the first-level platform 3.1 and the third-level platform 3.3 is H1, and 0

[0057] A plate positioning groove 4 for placing the mounting plate 1 is provided on the first-level platform 3.1, and the depth of the plate positioning groove 4 is H_3, and H2<H3; three needle positioning grooves 5 for placing three discharge needles 2 in a one-to-one correspondence are provided on the third-level platform 3.3; the plate clamping assembly is detachably connected to the fixture mold 3 for clamping the mounting plate 1; the needle clamping assembly is detachably connected to the fixture mold 3 for clamping the discharge needle 2.

[0058] Furthermore, let the thickness of the mounting plate 1 be h2, and let the vertical dimension of the discharge needle 2 when it is laid flat be h1, then H2<h2,h2≤H3.

[0059] Furthermore, the plate clamping assembly includes a first pressure plate 8 and at least one first bolt member 9; a first threaded hole 6 corresponding to the first bolt member 9 is opened on the first-level platform 3.1; the first bolt member 9 cooperates with the first threaded hole 6 so that the first pressure plate 8 clamps the mounting plate 1.

[0060] Furthermore, the needle pressing assembly includes a second pressing plate 10 and at least one second bolt member 11; a second threaded hole 7 corresponding to the second bolt member 11 is opened on the third-level platform 3.3; the second bolt member 11 cooperates with the second threaded hole 7 so that the second pressing plate 10 presses the discharge needle 2.

[0061] like Figure 5 As shown, among the three discharge needles 2 of the aircraft static discharger, the discharge needle 2 in the middle is a straight line structure, and the two discharge needles 2 on both sides have two bends. For the bent discharge needle 2, there is a slanted line segment in the middle and straight line segments at both ends, and the straight line segments at both ends are parallel to each other, and the straight line segment at one end is connected to the mounting plate 1, and the straight line segment at the other end is suspended. In the process of brazing the aircraft static discharger, the technical solution places the suspended straight line segment of the discharge needle 2 in the needle positioning groove 5.

[0062] ​Based on this, further, the needle positioning groove 5 is a straight structure, and the three needle positioning grooves 5 are parallel to each other and arranged at equal intervals. The specific spacing of the three needle positioning grooves 5 is determined according to the distance w1 between the suspended straight segments of the two bent discharge needles 2 and the middle discharge needle 2.

[0063] Furthermore, the cross section of the needle positioning groove 5 is "V"-shaped, which adapts to the large tolerance of sheet metal parts and ensures the convenience and stability of fastening and clamping the discharge needle 2.

[0064] Furthermore, the common edge of the four-level platform 3.4 and the three-level platform 3.3 is provided with three-level stepped positioning surfaces 12 corresponding to the three needle positioning grooves 5, and all the stepped positioning surfaces 12 are parallel to each other. Figure 2 As shown, one end of the needle positioning groove 5 extends to the corresponding stepped positioning surface 12, and the other end passes through the common edge of the third-level platform 3.3 and the second-level platform 3.2. In this technical solution, the setting of the three-level stepped positioning surface 12 ensures that the ends of the three discharge needles 2 have a plane positioning reference. Compared with the commonly used inclined surface point contact positioning, the advantage of the stepped positioning surface 12 is that the surface contact positioning of the ends of the three discharge needles 2 is achieved, ensuring the assembly position relationship of the ends of the three discharge needles 2.

[0065] Furthermore, the mold is made of bakelite. Compared with commonly used steel tooling materials, bakelite has the advantage of slow heat dissipation. When using a positioning fixture for brazing, the heat loss of the brazed joint is small, the heating temperature of the brazed joint can be guaranteed, and the strength of the brazed joint can be improved. In addition, the corrosion resistance of bakelite can solve the problem of corrosion and rust of commonly used steel materials due to brazing agents.

[0066] Example 6

[0067] This embodiment discloses a brazing method for an aircraft static discharger. As a preferred embodiment of the present invention, a positioning fixture for an aircraft static discharger disclosed in Embodiments 1, 2, 3, 4 or 5 is used, and the method comprises the following steps:

[0068] S1, preparing welding parts of an aircraft static discharger, including a mounting plate 1 and three discharge needles 2, wherein three grooves 1.1 are processed on the mounting plate 1;

[0069] S2, placing the positioning fixture on a workbench and cleaning the top of the positioning fixture;

[0070] S4, placing the mounting plate 1 in the plate positioning groove 4 with the side of the mounting plate 1 provided with the groove 1.1 facing upwards;

[0071] S5, placing the three discharge needles 2 in the three needle positioning grooves 5 and the three grooves 1.1 one by one; that is, for each single discharge needle 2, one end thereof is placed in the corresponding needle positioning groove 5, and the other end thereof is placed in the corresponding groove 1.1;

[0072] S6, using a plate pressing assembly and a needle pressing assembly to respectively press and fix the mounting plate 1 and all the discharge needles 2;

[0073] S7, applying a flux to the area to be welded between the mounting plate 1 and the discharge needle 2, and sequentially welding the three discharge needles 2 to the mounting plate 1 by soft soldering;

[0074] S8, after brazing is completed, use hot water to clean the residual flux and grind the weld. Remove the welded aircraft static discharger from the positioning fixture and check the brazing quality and external dimensions according to the specification requirements.

[0075] Example 7

[0076] This embodiment discloses a brazing method for an aircraft static discharger. As a preferred embodiment of the present invention, a positioning fixture for an aircraft static discharger disclosed in Embodiments 1, 2, 3, 4 or 5 is used, and the method comprises the following steps:

[0077] S1, prepare the welding parts of the aircraft static discharger, including a mounting plate 1 and three discharge needles 2, wherein three grooves 1.1 are processed on the mounting plate 1. Among them, the grooves 1.1 on the mounting plate 1 are processed with positive tolerance, firstly to ensure the flatness of the static discharger after welding, and secondly to reserve a certain gap (such as not less than 0.5mm) between the bottom of the groove 1.1 of the mounting plate 1 and the roots of the three discharge needles 2, so as to promote the brazing brazing material to flow into the bottom of the groove 1.1 of the mounting plate 1, solve the problem of partial incomplete welding at the root of the discharge needle 2, and improve the quality of the brazing joint. Further, the depth of the groove 1.1 on the mounting plate 1 is set according to the design requirements of the aircraft static discharger, such as the depth of the groove 1.1 can be 2mm-2.12mm. In addition, the material category of the discharge needle 2 is steel wire, and the cross-sectional size of the steel wire can be selected according to the design requirements of the aircraft static discharger, such as, a steel wire with h_1=2mm can be selected.

[0078] S2, placing the positioning fixture on a workbench and cleaning the top of the positioning fixture.

[0079] S4, place the mounting plate 1 in the plate positioning groove 4 with the side of the groove 1.1 on the mounting plate 1 facing upwards; after the discharge needle 2 is placed, the gap between the discharge needle 2 and the corresponding groove 1.1 on the mounting plate 1 is not less than 0.5 mm, and the highest point of the surface of the discharge needle 2 is not higher than the upper surface of the mounting plate 1. In this way, the brazing filler metal is promoted to flow into the bottom of the groove 1.1 of the mounting plate 1, solving the problem of partial incomplete penetration at the root of the discharge needle 2 and improving the quality of the brazing joint.

[0080] S5, placing the three discharge needles 2 in the three needle positioning grooves 5 and the three grooves 1.1 one by one; that is, for each single discharge needle 2, one end thereof is placed in the corresponding needle positioning groove 5, and the other end is placed in the corresponding groove 1.1.

[0081] S6, using the plate clamping assembly and the needle clamping assembly to clamp and fix the mounting plate 1 and all the discharge needles 2. To ensure the welder's operating space, the side edge of the second clamping plate 10 in the needle clamping assembly is not less than 4 mm away from the edge of the area to be welded.

[0082] S7, applying a flux to the area to be welded between the mounting plate 1 and the discharge needle 2, and sequentially welding the three discharge needles 2 to the mounting plate 1 by soft soldering. The solder may be silver-lead solder.

[0083] S8, after brazing is completed, use hot water to clean the residual flux and grind the weld nodules.

Claims

1. A positioning fixture for an aircraft static discharger, wherein: The aircraft static discharger comprises a mounting plate (1), one side of which is provided with three grooves (1.1), and three discharge needles (2) are welded in the three grooves (1.1) in a one-to-one correspondence; the characteristic is that the positioning fixture comprises a fixture mold (3), a plate pressing assembly and a needle pressing assembly; The top of the clamp mold (3) is arranged in a stepped structure, and from left to right are a first-level platform (3.1), a second-level platform (3.2), a third-level platform (3.3) and a fourth-level platform (3.4); wherein the height difference between the first-level platform (3.1) and the fourth-level platform (3.4) is 0, the height difference between the first-level platform (3.1) and the second-level platform (3.2) is H_2, the height difference between the first-level platform (3.1) and the third-level platform (3.3) is H1, and 0<H1<H2; The first-level platform (3.1) is provided with a plate positioning groove (4) for placing the mounting plate (1), the depth of the plate positioning groove (4) being H3, and H2<H3; the third-level platform (3.3) is provided with three needle positioning grooves (5) for placing three discharge needles (2) in a one-to-one correspondence; the plate pressing assembly is detachably connected to the fixture mold (3) and is used to press the mounting plate (1); the needle pressing assembly is detachably connected to the fixture mold (3) and is used to press the discharge needle (2).

2. A positioning fixture for an aircraft static discharger as claimed in claim 1, characterized in that: Let the thickness of the mounting plate (1) be h2, and let the vertical dimension of the discharge needle (2) when placed flat be h1, then H2≤h2, h2≤H3.

3. A positioning fixture for an aircraft static discharger as claimed in claim 1, characterized in that: The plate clamping assembly comprises a first clamping plate (8) and at least one first bolt member (9); a first threaded hole (6) corresponding to the first bolt member (9) is provided on the first-level platform (3.1); the first bolt member (9) cooperates with the first threaded hole (6) so that the first clamping plate (8) clamps the mounting plate (1).

4. A positioning fixture for an aircraft static discharger as claimed in claim 1, characterized in that: The needle pressing assembly comprises a second pressing plate (10) and at least one second bolt member (11); a second threaded hole (7) corresponding to the second bolt member (11) is provided on the third-level platform (3.3); the second bolt member (11) cooperates with the second threaded hole (7) so that the second pressing plate (10) presses the discharge needle (2).

5. A positioning fixture for an aircraft static discharger as claimed in claim 1, characterized in that: The cross section of the needle positioning groove (5) is V-shaped.

6. A positioning fixture for an aircraft static discharger as claimed in claim 1, characterized in that: The common edge of the four-level platform (3.4) and the three-level platform (3.3) is provided with three-level stepped positioning surfaces (12) corresponding one-to-one to the three needle positioning grooves (5), and all the stepped positioning surfaces (12) are parallel to each other.

7. A positioning fixture for an aircraft static discharger as claimed in claim 1, characterized in that: The needle positioning grooves (5) are in a linear structure, and the three needle positioning grooves (5) are parallel to each other and are arranged at equal intervals.

8. A positioning fixture for an aircraft static discharger as claimed in claim 1, characterized in that: The mold is made of bakelite.

9. A brazing method for aircraft static dischargers, characterized in that: A positioning fixture for an aircraft static discharger as claimed in any one of claims 1 to 8 is used, comprising the following steps: S1, preparing welding parts of an aircraft static discharger, including a mounting plate (1) and three discharge needles (2), wherein three grooves (1.1) are processed on the mounting plate (1); S2, placing the positioning fixture on a workbench and cleaning the top of the positioning fixture; S4, placing the mounting plate (1) in the plate positioning groove (4) with the side of the mounting plate (1) on which the groove (1.1) is arranged facing upwards; S5, placing the three discharge needles (2) in the three needle positioning grooves (5) and the three grooves (1.1) in a one-to-one correspondence; that is, for each single discharge needle (2), one end thereof is placed in the corresponding needle positioning groove (5), and the other end thereof is placed in the corresponding groove (1.1); S6, using a plate pressing assembly and a needle pressing assembly to respectively press and fix the mounting plate (1) and all the discharge needles (2); S7, applying a flux to the area to be welded between the mounting plate (1) and the discharge needle (2), and sequentially welding the three discharge needles (2) to the mounting plate (1) by soft soldering; S8, after brazing is completed, use hot water to clean the residual flux and grind the weld nodules.

10. A method for brazing an aircraft static discharger as claimed in claim 9, characterized in that: In the step S4, after the discharge needle (2) is placed, the gap between the discharge needle (2) and the corresponding groove (1.1) on the mounting plate (1) is not less than 0.5 mm, and the highest point on the surface of the discharge needle (2) is not higher than the upper surface of the mounting plate (1).

11. A method for brazing an aircraft static discharger as claimed in claim 9, characterized in that: In the step S1, the groove (1.1) on the mounting plate (1) is machined with a positive tolerance.

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