Disassembly tooling, assembly tooling and repair method of fuel pump regulator bracket assembly

Abstract

The present invention discloses a disassembly tool, an assembly tool and a repair method for a fuel pump regulator bracket assembly. The present invention constructs a centrosymmetrical platform through the bracket support of the disassembly tool to split the non-centrosymmetrical bracket assembly during the disassembly process and construct it into two separate centrosymmetrical bodies, so that the bushing at the rotation center can be mechanically removed by rotating the lathe, thereby achieving a fast and efficient disassembly effect; the present invention quantifies the geometric dimensions of the assembly tool so that the technical parameters of the bracket assembly assembled by the assembly tool meet the design requirements. The present invention can shorten the disassembly time of the bracket assembly from 12 hours to less than 1 hour, increase the assembly qualification rate of the bracket assembly from 30% to 100%, and shorten the assembly time from 100 hours to 25 hours, thereby effectively shortening the cycle of the entire repair process, reducing the labor intensity and significantly improving the efficiency of the repair.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft engine parts maintenance, and in particular to a disassembly tool for a fuel pump regulator bracket assembly, an assembly tool for the fuel pump regulator bracket assembly, and a repair method for the fuel pump regulator bracket assembly. Background Art

[0002] The fuel pump regulator is the core control accessory of the aircraft engine. It is mainly used to reliably control the aircraft engine at different flight altitudes, speeds, atmospheric temperatures and pressures to ensure the stable operation of the aircraft engine under various conditions. As a high-precision mechanical hydraulic control accessory, the fuel pump regulator has a complex internal structure and requires extremely high coordination and cooperation between various parts. Once a part or component is defective, it will have a huge impact on the control and stable operation of the entire aircraft engine. For example, if the graphite bushing of the bracket assembly of the aircraft engine main fuel pump regulator exceeds the standard, it will cause the aircraft engine parameters to fluctuate, affecting the aircraft's combat performance and threatening flight safety.

[0003] like Figure 1As shown, the bracket assembly 100 of the aircraft engine fuel pump regulator is composed of a bracket 110 and two graphite bushings 120, and the bracket 110 is provided with two bracket holes 130 for installing the bushings 120. The bushing plays a guiding and lubricating role in the operation of the aircraft engine. Its technical parameters include the center distance between the two bushings, the verticality of the bushing relative to the reference plane, the height of the bushing end face relative to the reference plane, etc., and the accuracy is required to reach 0.01mm; due to the high-precision parameter requirements of the bushing, when the inner hole of the bushing is worn during the operation of the engine, the bushing needs to be replaced if the inner hole parameters of the bushing are out of tolerance during maintenance. Since the material of the bracket in the bracket assembly is cast aluminum alloy, which has a low melting point, inactive chemical properties, is insoluble in conventional solvents, has a very low yield strength, and is very easy to deform; and the material of the bushing is graphite, which has a high melting point, inactive chemical properties, is insoluble in conventional solvents, has low strength and is brittle; therefore, based on the above characteristics of the bracket assembly, the bracket assembly cannot be decomposed by dissolution method, temperature method or torque method during repair, and the bracket assembly can only be decomposed by impact method. Because the bracket assembly is a non-axisymmetric structure, the conventional decomposition method is to decompose it with a scraper. When decomposing, a notch is first broken on the bushing, and then slowly scraped from the notch. The decomposition process is entirely manual and takes up to 12 hours, which seriously affects the progress of the repair. In addition, when a new bushing is replaced after the overhaul is completed, due to the clearance fit between the bushing and the bracket hole on the bracket, if there is no limit in the installation process, the assembly parameters will deviate greatly from the required values. Although the center distance and height parameters of the bushing can be repaired to a qualified level by grinding the inner hole and end face, the verticality dimension repair is difficult, with a success rate of only about 30%. If the repair is unsuccessful, the bushing must be disassembled and reassembled. Repeated disassembly and assembly seriously affect the repair progress and also increase the repair cost. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a disassembly tool, an assembly tool and a repair method for a fuel pump regulator bracket assembly, which can improve the repair efficiency by reducing the difficulty of disassembling the bracket assembly and assembling the bracket assembly.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a disassembly tool for a fuel pump regulator bracket assembly comprises a first clamping body and a second clamping body;

[0006] The first clamping body is composed of a support platform and a machine tool clamping part. The support platform is a circular plate. The machine tool clamping part is coaxially arranged with the support platform and connected to one side of the support platform. An axially protruding limiting circular platform is arranged at the center of the other side of the support platform. A connecting hole is also eccentrically arranged on one side of the support platform where the limiting circular platform is arranged.

[0007] The second clamp body is provided with a threaded section, a first cylindrical section, a second cylindrical section and a baffle which are coaxially connected in sequence, a locking nut is threadedly connected to the threaded section, the outer diameter of the first cylindrical section is equal to the diameter of the limiting cone, the second clamp body passes through the connecting hole and the second cylindrical section is interference fit with the connecting hole, and the baffle abuts against the bracket support to form an axial limiting fit.

[0008] As an improvement to the above solution: the support platform of the first clamping body and the machine tool clamping part are an integrated structure.

[0009] The present invention also discloses an assembly tool for a fuel pump regulator bracket assembly, comprising a base and a locating pin, wherein the locating pin is provided with a connecting section, a first columnar section and a second columnar section which are coaxially connected in sequence, and the diameter of the first columnar section is greater than the diameter of the second columnar section; the base is provided with a mounting hole which is compatible with the connecting section of the locating pin, and two locating pins are arranged at intervals and fixed on the base.

[0010] As an improvement of the above solution: a transition slope is provided between the connection section and the first columnar section of the positioning pin, and the transition slope is inclined toward the axial direction of the positioning pin; the inclination of the transition slope is 45°.

[0011] The present invention also discloses a method for repairing a fuel pump regulator bracket assembly, wherein the bracket assembly comprises a bracket and a bushing, and the bracket is provided with two bracket holes for installing the bushing. The repair method adopts the above-mentioned disassembly tooling and assembly tooling;

[0012] The repair method is carried out according to the following steps:

[0013] S1. Install the bracket assembly on the bracket support platform of the first clamping body, so that one bracket hole of the bracket is sleeved on the limiting circular platform of the first clamping body, and the other bracket hole of the bracket is sleeved on the first cylindrical section of the second clamping body, so that the protruding end of the bushing faces upward, and install the locking nut on the threaded section of the second clamping body and lock the bracket;

[0014] S2, fixing the machine tool clamping part of the first clamping body on the machine tool, so that the tool head of the machine tool is facing the bushing on the bracket assembly that is matched with the limit round table, and starting the machine tool to remove the bushing by mechanical processing;

[0015] S3, remove the bracket assembly from the bracket support, assemble the bracket hole with the bushing removed on the bracket with the second clamping body, put the bracket hole with the bushing not removed on the bracket on the limiting circular platform of the first clamping body, and repeat step S2 to remove the bushing in the other bracket hole;

[0016] S4. Prepare new bushings, apply glue on the outer peripheral surface of the bushings and the inner wall surface of the bracket hole, and install the two bushings into the two bracket holes respectively;

[0017] S5, press the two locating pins of the assembly tool into the two bushings respectively, so that the bushings are sleeved on the second columnar section of the locating pins and the end surface of the bushings contacts the end surface of the first columnar section;

[0018] S6. Keep the assembly tool pressed into the bracket assembly and place the whole assembly on a flat surface to remain still.

[0019] As an improvement of the above scheme: in the steps S1 and S3, a washer is arranged between the locking nut and the bracket, and the washer is sleeved on the second clamp body; when the bracket assembly is installed on the first clamp body, the washer is pressed onto the bracket by the locking nut.

[0020] The beneficial effects of the present invention are as follows: the present invention adopts a disassembly tool and an assembly tool in the repair steps of the aircraft engine fuel pump regulator bracket assembly, and uses the disassembly tool and the assembly tool to position and fix the bracket assembly to be repaired. The present invention constructs a centrally symmetrical platform through the bracket support of the disassembly tool to split the non-centrally symmetrical bracket assembly during the disassembly process and construct it into two separate centrally symmetrical bodies, so that the bushing at the rotation center can be mechanically removed by rotating the lathe, thereby achieving a fast and efficient disassembly effect; the present invention quantifies the geometric dimensions of the assembly tool so that the technical parameters of the bracket assembly assembled by the assembly tool meet the design requirements. The present invention can shorten the disassembly time of the bracket assembly from 12 hours to less than 1 hour, and increase the assembly qualification rate of the bracket assembly from 30% to 100%, and shorten the assembly time from 100 hours to 25 hours, thereby effectively shortening the cycle of the entire repair process, reducing the labor intensity and significantly improving the efficiency of the repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of a bracket assembly applicable to the present invention;

[0022] Figure 2 This is an axonometric view of the disassembled tooling and bracket assembly after assembly;

[0023] Figure 3 It is a cross-sectional view after the assembly of the disassembled tooling and the bracket assembly;

[0024] Figure 4 is a schematic structural diagram of the first clamp;

[0025] Figure 5 is a schematic structural diagram of the second clamp;

[0026] Figure 6 It is a structural schematic diagram of the assembly tooling;

[0027] Figure 7 It is a schematic diagram of the structure of the positioning pin.

[0028] Marked in the figure: 100-bracket assembly, 110-bracket, 120-bushing, 130-bracket hole, 200-disassembly tooling, 210-first clamping body, 211-bracket base, 212-machine tool clamping part, 213-limiting round table, 214-connecting hole, 220-second clamping body, 221-threaded section, 222-first cylindrical section, 223-second cylindrical section, 224-baffle, 230-locking nut, 240-washer, 300-assembly tooling, 310-base, 311-mounting hole, 320-locating pin, 321-connecting section, 322-first columnar section, 323-second columnar section. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the present invention, the present invention is further described below in conjunction with the accompanying drawings.

[0030] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “front”, “rear”, “left”, “right”, “up”, “down”, and “inside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of description. They do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0031] The repair method of the fuel pump regulator bracket assembly disclosed in the present invention includes the steps of disassembling, inspecting and assembling the bracket assembly 100 in sequence, wherein a disassembly tool 200 is used in the step of disassembling the bracket assembly 100, and an assembly tool 300 is used in the step of assembling the bracket assembly 100.

[0032] Specifically, Figure 2 and Figure 3 As shown, the disassembly tool 200 used in the present invention includes a first clamp body 210 and a second clamp body 220; the first clamp body 210 is used to carry the entire bracket assembly 100, and cooperates with the second clamp body 220 to achieve positioning and fixing of the bracket assembly 100; the second clamp body 220 is used to position and fix the bracket assembly 100.

[0033] The structure of the first clamp body 210 is as follows Figure 4As shown, the first clamping body 210 is composed of a support platform 211 and a machine tool clamping part 212. The support platform 211 is a circular plate structure, and a machine tool clamping part 212 and a limiting round table 213 are fixedly arranged on both sides of the support platform 211, respectively. The machine tool clamping part 212 and the limiting round table 213 are both arranged at the center position of the support platform 211, so that the machine tool clamping part 212 and the limiting round table 213 are coaxially arranged with the support platform 211. The machine tool clamping part 212 is used to clamp and fix with the machine tool, and the rotation of the machine tool clamping part 212 is determined by the machine tool to drive the entire decomposition tool 200 to rotate. The limiting truncated cone 213 is used to position the bracket hole 130 on the bracket assembly 100. The limiting truncated cone 213 protrudes axially at the center of the bracket support 211. The diameter of the limiting truncated cone 213 is adapted to the aperture of the bracket hole 130 on the bracket assembly 100, so that the limiting truncated cone 213 can be embedded in the bracket hole 130 to form a radial limiting fit. In addition, a connecting hole 214 is also provided on the bracket support 211 of the first clamp body 210. The connecting hole 214 is an eccentrically arranged through hole. The connecting hole 214 is used to realize the assembly of the second clamp body 220 on the first clamp body 210; and the center distance between the connecting hole 214 and the limiting truncated cone 213 is equal to the center distance between the two bracket holes 130 on the bracket 110. In order to improve the overall strength of the first clamp body 210, the bracket support 211 of the first clamp body 210 and the machine tool clamping part 212 are set as an integrated structure in the present invention.

[0034] The structure of the second clamp body 220 is as follows Figure 5 As shown, the second clamp body 220 is a cylindrical structure with multiple sections of different outer diameters, and a coaxially connected threaded section 221, a first cylindrical section 222, a second cylindrical section 223 and a baffle 224 are sequentially arranged on the second clamp body 220. Figures 3 to 5As shown, a locking nut 230 is threadedly connected to the threaded section 221, and the bracket assembly 100 is pressed against the first clamp body 210 by the locking nut 230; the first cylindrical section 222 is used to position the bracket assembly 100, and the outer diameter of the first cylindrical section 222 is equal to the diameter of the limiting truncated cone 213, and is adapted to the bracket hole 130 on the bracket assembly 100, so that the second cylindrical section 223 can be positioned and fixed with the bracket hole 130 of the bracket assembly 100; the second cylindrical section 223 is used to adapt to the connecting hole 214 on the first clamp body 210, The second clamp body 220 passes through the connecting hole 214, and the second cylindrical section 223 of the second clamp body 220 forms an interference fit; the size of the baffle plate 224 is larger than the size of the connecting hole 214 so that when the second clamp body 220 passes through the connecting hole 214, the baffle plate 224 can abut against the bracket support 211 to form an axial limiting fit, thereby limiting the bracket assembly 100 and the first clamp body 210 at both ends of the second clamp body 220 through the locking nut 230 and the baffle plate 224, respectively, and clamping the bracket assembly 100 on the first clamp body 210.

[0035] Furthermore, in order to improve the locking effect of the locking nut 230 on the bracket assembly 100, as Figure 3 As shown, the present invention further adds a washer 240 to the second clamp body 220 , the washer 240 is sleeved on the second clamp body 220 and is located between the locking nut 230 and the bracket 110 , when the bracket assembly 100 is installed on the first clamp body 210 , the washer 240 is pressed against the bracket 110 by the locking nut 230 .

[0036] Specifically, Figure 6 As shown, the assembly tool 300 used in the present invention is composed of a base 310 and a positioning pin 320. The base 310 adopts a rectangular plate structure, and two mounting holes 311 are arranged on the base 310 in the thickness direction of the base 310. The two mounting holes 311 are arranged at intervals on the center line of the base 310, and the center distance between the two mounting holes 311 is equal to the center distance between the two bracket holes 130 on the bracket assembly 100. The two positioning pins 320 are respectively installed in the two mounting holes 311. The structure of the positioning pins 320 is as shown in FIG. Figure 7 As shown, the positioning pin 320 is a cylindrical structure with multiple sections of different outer diameters, and the positioning pin 320 is provided with a connecting section 321, a first columnar section 322, and a second columnar section 323 which are coaxially connected in sequence. The connecting section 321 of the positioning pin 320 is adapted to the mounting hole 311, so that the outer diameter of the connecting section 321 of the positioning pin 320 is adapted to the hole diameter of the mounting hole 311 so that the connecting section 321 can form a tight fit with the mounting hole 311; the diameter of the first columnar section 322 of the positioning pin 320 is greater than the diameter of the second columnar section 323, and the diameter of the second columnar section 323 is adapted to the inner diameter of the bushing 120 in the bracket assembly 100.

[0037] Furthermore, in the present invention, a transition slope is provided between the connecting section 321 and the first columnar section 322 of the positioning pin 320 , and the transition slope is inclined toward the axial direction of the positioning pin 320 , and the slope of the transition slope is 45°.

[0038] When the present invention uses the above-mentioned disassembly tool 200 and assembly tool 300 to repair the fuel pump regulator bracket assembly, the following steps are followed:

[0039] S1. Install the bracket assembly 100 on the bracket support 211 of the first clamp body 210, so that one bracket hole 130 of the bracket 110 is sleeved on the limiting truncated cone 213 of the first clamp body 210, and the other bracket hole 130 of the bracket 110 is sleeved on the first cylindrical section 222 of the second clamp body 220, so that the protruding end of the bushing 120 faces upward, and install the locking nut 230 on the threaded section 221 of the second clamp body 220 and lock the bracket 110;

[0040] S2, fix the machine tool clamping part 212 of the first clamping body 210 on the machine tool, make the tool head of the machine tool face the bushing 120 on the support assembly 100 that matches the limiting truncated table 213, start the machine tool, and the entire support assembly 100 rotates with the central axis of the first clamping body 210 as the rotation axis. At this time, send the tool head of the machine tool into the bushing 120 on the rotation axis, and remove the bushing 120 by mechanical processing;

[0041] S3, remove the bracket assembly 100 from the bracket support 211, assemble the bracket hole 130 of the bracket 110 from which the bushing 120 has been removed with the second clamp body 220, and put the bracket hole 130 of the bracket 110 from which the bushing 120 has not been removed on the limiting truncated cone 213 of the first clamp body 210, and repeat step S2 to remove the bushing 120 in another bracket hole 130;

[0042] S4, after the maintenance of the bracket assembly 100 is completed, prepare a new bushing 120, apply glue on the outer peripheral surface of the bushing 120 and the inner wall surface of the bracket hole 130, and install the two bushings 120 into the two bracket holes 130 respectively;

[0043] S5. Press the two positioning pins 320 of the assembly tool 300 into the two bushings 120 respectively, and press the bushings 120 to the bottom, so that the bushings 120 are sleeved on the second columnar section 323 of the positioning pins 320 and the end surface of the bushings 120 contacts the end surface of the first columnar section 322;

[0044] S6, keeping the assembly tool 300 pressed into the bracket assembly 100, and placing the whole assembly on a plane and letting it stand until the process time.

[0045] The present invention adopts the above-mentioned method for repairing the fuel pump regulator bracket assembly. When disassembling the bracket assembly 100, the bracket assembly 100 can be disassembled quickly and efficiently, and the disassembly time of a single bracket assembly 100 is shortened from an average of 12 hours to less than 1 hour, which greatly shortens the disassembly time of the bracket assembly 100, thereby effectively shortening the repair cycle; when assembling the bracket assembly 100, the manual labor intensity is effectively reduced, and it can be ensured that the technical parameters of the bracket assembly 100 after assembly meet the requirements of the design drawings, the assembly success rate can be as high as 100%, and the assembly time is also shortened, and the assembly time of each bracket assembly 100 is shortened from an average of 100 hours to 25 hours, while shortening the repair cycle, improving the assembly quality and reducing the repair cost.

Claims

1. A method for repairing a fuel pump regulator bracket assembly, wherein the bracket assembly (100) comprises a bracket (110) and a bushing (120), wherein the bracket (110) is provided with two bracket holes (130) for mounting the bushing (120), and wherein: The repair method uses a disassembly tool for the fuel pump regulator bracket assembly and an assembly tool for the fuel pump regulator bracket assembly; The disassembly tooling of the fuel pump regulator bracket assembly comprises a first clamping body (210) and a second clamping body (220); The first clamping body (210) is composed of a support platform (211) and a machine tool clamping part (212); the support platform (211) is a circular plate; the machine tool clamping part (212) is coaxially arranged with the support platform (211) and connected to one side of the support platform (211); an axially protruding limiting truncated platform (213) is arranged at the center of the other side of the support platform (211); and a connecting hole (214) is eccentrically arranged on one side of the support platform (211) provided with the limiting truncated platform (213); The second clamp body (220) is provided with a threaded section (221), a first cylindrical section (222), a second cylindrical section (223) and a baffle (224) which are coaxially connected in sequence; a locking nut (230) is threadedly connected to the threaded section (221); the outer diameter of the first cylindrical section (222) is equal to the diameter of the limiting truncated table (213); the second clamp body (220) passes through the connecting hole (214) and the second cylindrical section (223) is interference fit with the connecting hole (214); the baffle (224) abuts against the bracket support table (211) to form an axial limiting fit; The assembly tool of the fuel pump regulator bracket assembly comprises a base (310) and a positioning pin (320), wherein the positioning pin (320) is provided with a connecting section (321), a first columnar section (322) and a second columnar section (323) which are coaxially connected in sequence, and the diameter of the first columnar section (322) is larger than the diameter of the second columnar section (323); the base (310) is provided with a mounting hole (311) which is compatible with the connecting section (321) of the positioning pin (320), and two positioning pins (320) are arranged at intervals and fixed on the base (310); The repair method is carried out according to the following steps: S1. Install the bracket assembly (100) on the bracket support platform (211) of the first clamp body (210), so that one bracket hole (130) of the bracket (110) is sleeved on the limiting truncated cone (213) of the first clamp body (210), and the other bracket hole (130) of the bracket (110) is sleeved on the first cylindrical section (222) of the second clamp body (220), so that the protruding end of the bushing (120) faces upward, and install the locking nut (230) on the threaded section (221) of the second clamp body (220) and lock the bracket (110); S2, fixing the machine tool clamping portion (212) of the first clamping body (210) on the machine tool so that the tool head of the machine tool faces the bushing (120) on the support assembly (100) that matches the limiting truncated table (213), and starting the machine tool to remove the bushing (120) by mechanical processing; S3, remove the bracket assembly (100) from the bracket support (211), assemble the bracket hole (130) on the bracket (110) from which the bushing (120) has been removed with the second clamp body (220), and put the bracket hole (130) on the bracket (110) from which the bushing (120) has not been removed onto the limiting truncated cone (213) of the first clamp body (210), and repeat step S2 to remove the bushing (120) in another bracket hole (130); S4, prepare a new bushing (120), apply glue on the outer peripheral surface of the bushing (120) and the inner wall surface of the bracket hole (130), and install the two bushings (120) into the two bracket holes (130) respectively; S5, respectively press the two positioning pins (320) of the assembly tool (300) into the two bushings (120), so that the bushings (120) are sleeved on the second columnar section (323) of the positioning pin (320) and the end surface of the bushing (120) is in contact with the end surface of the first columnar section (322); S6. Keep the assembly tool (300) pressed into the bracket assembly (100), and place the whole assembly on a flat surface to remain still.

2. The method for repairing a fuel pump regulator bracket assembly according to claim 1, characterized in that: In the steps S1 and S3, a washer (240) is arranged between the locking nut (230) and the bracket (110), and the washer (240) is sleeved on the second clamp body (220); when the bracket assembly (100) is installed on the first clamp body (210), the washer (240) is pressed against the bracket (110) by the locking nut (230).

3. The method for repairing a fuel pump regulator bracket assembly according to claim 1, characterized in that: The support platform (211) and the machine tool clamping part (212) of the first clamping body (210) are arranged as an integrated structure.

4. The method for repairing a fuel pump regulator bracket assembly according to claim 1, characterized in that: A transition slope is provided between the connecting section (321) and the first columnar section (322) of the positioning pin (320), so that the transition slope is inclined toward the axial direction of the positioning pin (320); the inclination of the transition slope is set to 45°.

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