Assembly tool for aero-engine small variable-diameter bolt double-end stud

Abstract

The utility model discloses an aero-engine small variable-diameter bolt stud assembly tool in the technical field of assembly tools, which comprises an intermediate machine brake, the intermediate machine brake is provided with a plurality of threaded holes, the upper parts of the threaded holes are connected with variable-diameter bolt studs, the upper parts of the variable-diameter bolt studs are connected with knocking cylinders, and the knocking cylinders are connected with the intermediate machine brake. The outer side of the variable-diameter bolt stud is sleeved with a positioning piece fixing sleeve, and a plurality of bolt positioning pieces are arranged in the positioning piece fixing sleeve. By means of the design, the problem that in the prior art, a bolt is prone to bending or breaking after pre-grooving can be effectively solved, through multi-layer stacking of the bolt positioning pieces, enough supporting force is provided, the thickness is allowed to be adjusted according to actual needs so as to adapt to bolts of different sizes, and in addition, the bolt positioning pieces are convenient to use. Due to the design of the positioning piece fixing sleeve, the stability and the accuracy of the whole assembling process are ensured, and deviation caused by manual operation is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of assembly tooling, particularly relates to an assembly tooling for small-diameter variable-diameter dowel stud of an aero-engine. BACKGROUND

[0002] In recent years, with the rapid development of aero-engine technology and the continuous improvement of high performance and high reliability requirements, more international advanced production technologies and design concepts have been gradually introduced in the design and manufacturing process of domestic small and medium-sized aero-engines. In particular, for the selection of intermediate casing fasteners, variable-diameter dowel studs are widely used due to their unique structural advantages. Such studs usually have a dowel key (usually 2-4) on the outer thread of the assembly section, and the assembly section is slotted, and the dowel is knocked into the part along the slotted direction of the stud to achieve locking function. However, since the variable-diameter dowel studs used in small aero-engines are generally small in diameter (Φ4.6-6.4mm), this makes the design and assembly of the dowel face many challenges. For example, under the premise of ensuring the strength of the stud, the slot size should not be too large, which results in a relatively small dowel size, thereby increasing the assembly difficulty.

[0003] The traditional small-diameter variable-diameter dowel stud assembly process mainly includes pre-assembly positioning slotting and subsequent dowel installation steps. Among them, pre-assembly refers to preliminary fixation before the stud is completely screwed into the intermediate casing, and the slotting position is determined accordingly; and positioning slotting refers to cutting the stud at a specific angle according to the pre-set position to facilitate correct insertion of the dowel. Although this method can meet certain assembly requirements, it has obvious shortcomings.

[0004] In the prior art, the assembly method of small-diameter variable-diameter dowel studs mainly relies on pre-assembly and positioning slotting process, which not only increases additional cost and time period, but also due to the small size of the bottom hole, manual precise slotting is not possible, and equipment is needed to complete, which further increases the cost and may damage the thread integrity. At the same time, the dowel assembly after slotting may appear locking failure, because slotting requires additional processing steps and equipment support, which increases the process complexity. In addition, the current assembly method cannot effectively solve the problem of axial vertical positioning of the dowel, especially after pre-slotting without positioning, which may cause the dowel to bend or break, and cannot meet the assembly requirements. SUMMARY

[0005] Aiming at the deficiencies in the prior art, the utility model provides an aviation engine small -size variable -diameter bolt stud's assembly tool, including intermediate machine brake, a plurality of threaded holes are opened to the intermediate machine brake, the upper portion of threaded hole is connected with variable -diameter bolt stud, the upper portion of variable -diameter bolt stud is connected with knock cylinder, the outside of variable -diameter bolt stud is covered with positioning sheet fixed sleeve, the inside of positioning sheet fixed sleeve is equipped with a plurality of bolt positioning sheets, the left side and the right side of variable -diameter bolt stud are opened with the slot respectively, the first bolt is slidably connected in the slot, the mounting hole is opened to the intermediate machine brake.

[0006] The variable-diameter bolt stud includes a shank, a first external thread portion is provided at an upper portion of the shank, and a second external thread portion is provided at a lower portion of the shank.

[0007] The lower portion of the shank is provided with a variable-diameter thickening portion, and the placement slot is arranged on the variable-diameter thickening portion.

[0008] The first bolt includes a trapezoidal plate, and a tab portion is fixedly connected to a lower portion of the trapezoidal plate.

[0009] A first through hole is provided at a middle portion of the positioning sheet fixed sleeve, and an extension through hole is connected to each of left and right sides of the first through hole.

[0010] A second through hole is provided at a middle portion of the bolt positioning sheet, and a trapezoidal through hole is provided at an ear portion of the bolt positioning sheet.

[0011] Compared with the prior art, the utility model has the beneficial effects that:

[0012] 1. During assembly, first, the variable-diameter bolt stud is screwed into the threaded hole of the intermediate machine case, and the stud reaches the position required by the technical document. Then, the bolt is inserted into the placement slot of the stud. Next, the knock cylinder is used to preliminarily fix the bolt. Subsequently, single or multiple bolt positioning sheets are assembled on the variable-diameter bolt stud in sequence, so that the trapezoidal through holes of the positioning sheets match the trapezoidal plate of the bolt, thereby realizing the circumferential fixation of the bolt. Finally, the positioning sheet fixed sleeve is assembled, and the extension through holes in the inside of the positioning sheet fixed sleeve cooperate with the bolt positioning sheets to ensure the axial vertical positioning of the bolt. This design can effectively solve the problem that the bolt is prone to bending or breaking after the pre-grooving in the prior art. Through the multi-layer superposition of the bolt positioning sheets, not only sufficient support force is provided, but also the thickness can be adjusted according to actual needs to adapt to bolts of different sizes. In addition, the design of the positioning sheet fixed sleeve ensures the stability and accuracy of the entire assembly process, avoiding deviations caused by manual operation.

[0013] 2, the knocking cylinder is a tubular structure, its inner hole closely matches the smooth surface of the variable-diameter pin stud, and its outer wall matches the inner circle of the positioning sheet fixing sleeve, which is used for positioning the fixing sleeve. During assembly, workers use a hammer or a copper hammer to gently knock the knocking cylinder, so that the pin gradually moves along the hole of the positioning sheet to the intermediate machine case threaded hole until the pin is completely embedded in place. In this process, the knocking cylinder plays a role in transmitting force, ensuring uniform and controllable force. Therefore, the assembly can be completed without damaging the stud and pin. The traditional assembly method often relies on directly knocking the pin, which may cause the pin to deform or even break. The application of the knocking cylinder changes this situation, which provides an additional protective layer for the pin to prevent damage caused by direct impact. In addition, by controlling the knocking force and frequency, the insertion depth of the pin can be more accurately controlled to ensure the assembly quality. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, a brief introduction will be given below to the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.

[0015] Figure 1 is the overall structure schematic diagram in the present application;

[0016] Figure 2 is the explosion structure schematic diagram in the present application;

[0017] Figure 3 is the variable-diameter pin stud structure schematic diagram in the present application;

[0018] Figure 4 is the variable-diameter pin stud side surface structure schematic diagram in the present application;

[0019] Figure 5 is the positioning sheet fixing sleeve structure schematic diagram in the present application;

[0020] Figure 6 is the pin positioning sheet structure schematic diagram in the present application.

[0021] In the figure: 1, intermediate machine brake; 2, mounting hole; 3, threaded hole; 4, trapezoidal through hole; 5, knocking cylinder; 6, positioning sheet fixing sleeve; 61, extension through hole; 62, first through hole; 7, pin positioning sheet; 71, second through hole; 72, ear part; 8, variable-diameter pin stud; 81, first external thread part; 82, second external thread part; 83, variable-diameter thickening part; 84, placing groove; 85, column body; 9, first pin; 91, trapezoidal plate; 92, pin part. DETAILED DESCRIPTION

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] like Figures 1-6 The assembly fixture shown is for a small variable diameter double-ended stud for an aircraft engine. It includes an intermediate gate 1, which has several threaded holes 3. A variable diameter stud 8 is connected to the upper part of the threaded holes 3. A striking cylinder 5 is connected to the upper part of the variable diameter stud 8. A positioning plate fixing sleeve 6 is fitted on the outside of the variable diameter stud 8. Several pin positioning plates 7 are provided inside the positioning plate fixing sleeve 6. Placement grooves 84 are respectively opened on the left and right sides of the variable diameter stud 8. A first pin 9 is slidably connected in the placement groove 84. An installation hole 2 is opened on the intermediate gate 1.

[0024] The variable diameter stud 8 includes a stud body 85, with a first external thread 81 on the upper part of the stud body 85 and a second external thread 82 on the lower part of the stud body 85.

[0025] The lower part of the column body 85 is provided with a diameter-reducing and thickening part 83, and the placement groove 84 is provided on the diameter-reducing and thickening part 83.

[0026] The first pin 9 includes a trapezoidal plate 91, and a insert portion 92 is fixedly connected to the lower part of the trapezoidal plate 91.

[0027] The positioning plate fixing sleeve 6 has a first through hole 62 in the middle, and extension through holes 61 are connected to the left and right sides of the first through hole 62 respectively.

[0028] The middle part of the pin positioning piece 7 is provided with a second through hole 71, and the ear part 72 of the pin positioning piece 7 is provided with a trapezoidal through hole 4.

[0029] Working principle: First, screw the reducing pin stud 8 into the threaded hole 3 of the intermediate housing, ensuring it reaches the position required by the process technical documents. In this step, the second external thread 82 of the reducing pin stud 8 fits tightly with the threaded hole 3, ensuring stable installation of the stud in the intermediate housing.

[0030] Next, insert the first pin 9 into the placement slot 84 of the reducing pin stud 8. At this time, the first pin 9 and the stud are separate structures and have not yet been finally fixed.

[0031] The first pin 9 is preliminarily fixed by using the knocking cylinder 5. The inner hole of the knocking cylinder 5 is matched with the smooth surface of the variable-diameter pin stud 8, and the outer wall is matched with the inner circle of the positioning sheet fixing sleeve 6 used subsequently, so that axial positioning is realized. In this process, the worker taps the knocking cylinder 5 with a hammer or a copper hammer, so that the first pin 9 is slightly pressed in the direction of the placement groove 84, but is not completely embedded, and is prepared for subsequent accurate assembly.

[0032] The single or multiple pin positioning sheets 7 are assembled on the variable-diameter pin stud 8 in sequence, the trapezoidal through hole 4 of each positioning sheet is matched with the trapezoidal plate 91 of the first pin 9, and the circumferential fixation of the first pin 9 is realized. The middle part of the pin positioning sheet 7 is provided with a second through hole 71 for matching with the smooth surface of the stud, so as to provide axial positioning. According to actual needs, the length size of the exposed part of the first pin 9 can be controlled by increasing or reducing the number of pin positioning sheets 7, and is generally kept at about 1-2 mm.

[0033] After the assembly of the pin positioning sheet 7 is completed, the positioning sheet fixing sleeve 6 is assembled in place. The extension through hole 61 on both sides of the positioning sheet fixing sleeve 6 is matched with the trapezoidal through hole 4 on the ear part 72 of the pin positioning sheet 7, and the first through hole 62 in the middle is matched with the knocking cylinder 5. After assembly, no shaking should be found when rotating left and right, so as to ensure that the whole system is stable and reliable.

[0034] The knocking cylinder 5 is vertically assembled, so that the inner hole is matched with the variable-diameter pin stud 8, and the outer wall is matched with the inner circle of the positioning sheet fixing sleeve 6, and further axial positioning is performed. The hammer or copper hammer is used for vertical tapping for multiple times with small force, so that the first pin 9 gradually moves along the trapezoidal through hole 4 of the pin positioning sheet 7 to the intermediate machine case threaded hole 3, until the exposed part of the first pin 9 is flush with the pin positioning sheet 7.

[0035] After each tapping, one pin positioning sheet 7 is removed for continuous tapping, and the above process is repeated until the last pin positioning sheet 7 is removed. At this time, the first pin 9 has been completely embedded in place and forms an integral structure with the stud.

[0036] After all the tooling is removed, the knocking cylinder 5 is used for final inspection tapping, and it is confirmed that the first pin 9 has been accurately assembled in place without loosening or deviation. This step ensures the assembly quality and reliability, and provides protection for subsequent use.

[0037] Through the above steps, the present application realizes efficient and accurate assembly of the small variable-diameter pin double-headed stud, avoids the problems of strength reduction and stress concentration caused by the slotting attachment process in the traditional method, simplifies the assembly process, improves the assembly efficiency and quality, and reduces the manufacturing cost and risk. In addition, the tooling is simple in design and easy to operate, is suitable for various types of variable-diameter pin studs 8, and has good interchangeability and universality.

[0038] The above description of the embodiments is only used to help understand the method of the utility model and its core idea. It should be pointed out that for ordinary skilled persons in the art, without departing from the principles of the utility model, the utility model can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the utility model claims.

Claims

1. An assembly fixture for a small variable diameter double-ended stud for an aircraft engine, comprising an intermediate brake (1), characterized in that: The intermediate gate (1) has several threaded holes (3), the upper part of the threaded holes (3) is connected to a variable diameter pin stud (8), the upper part of the variable diameter pin stud (8) is connected to a striking cylinder (5), the outer side of the variable diameter pin stud (8) is fitted with a positioning plate fixing sleeve (6), the inside of the positioning plate fixing sleeve (6) is provided with several pin positioning plates (7), the left and right sides of the variable diameter pin stud (8) are respectively provided with placement grooves (84), the first pin (9) is slidably connected in the placement groove (84), and the intermediate gate (1) has an installation hole (2).

2. The assembly tooling for a small variable diameter double-ended stud for an aero-engine according to claim 1, characterized in that: The variable diameter stud (8) includes a stud body (85), the upper part of which is provided with a first external thread (81), and the lower part of which is provided with a second external thread (82).

3. The assembly tooling for a small variable diameter double-ended stud for an aero-engine according to claim 2, characterized in that: The lower part of the column (85) is provided with a variable diameter thickening part (83), and the placement groove (84) is provided on the variable diameter thickening part (83).

4. The assembly tooling for a small variable diameter double-ended stud for an aero-engine according to claim 1, characterized in that: The first pin (9) includes a trapezoidal plate (91), and the lower part of the trapezoidal plate (91) is fixedly connected to the insert portion (92).

5. The assembly tooling for a small variable diameter double-ended stud for an aero-engine according to claim 1, characterized in that: The positioning plate fixing sleeve (6) has a first through hole (62) in the middle, and extension through holes (61) are connected to the left and right sides of the first through hole (62).

6. The assembly tooling for a small variable diameter double-ended stud for an aero-engine according to claim 1, characterized in that: The middle part of the pin positioning piece (7) is provided with a second through hole (71), and the ear part (72) of the pin positioning piece (7) is provided with a trapezoidal through hole (4).

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