A bolt positioning tool for a turbojet engine in a narrow space

Abstract

This utility model provides a bolt positioning fixture for a turbojet engine in a confined space, including an upper positioning plate, a positioning assembly, and a lower positioning plate. The lower positioning plate is connected to the upper positioning plate through the positioning assembly. In use, by fitting the entire bolt positioning fixture onto the main shaft journal, the lower positioning plate is limited by the obstruction at the main shaft journal, and the upper positioning plate moves downward under gravity. This drives the pull rod in the positioning assembly to expand the positioning claw in the positioning assembly to position the inner side of the bolt, thus facilitating the alignment of parts with the bolts and reducing the difficulty of operation, improving assembly production efficiency. After the squirrel cage support of the turbojet engine is installed, pulling up the upper positioning plate drives the pull rod in the positioning assembly, thereby causing the positioning claw in the positioning assembly to retract, allowing the entire bolt positioning fixture to avoid the squirrel cage support and enabling quick disassembly of the entire positioning fixture.

Description

Technical Field

[0001] This utility model relates to the field of bolt positioning tooling in confined spaces of turbojet engines. Background Technology

[0002] A certain type of turbojet engine has six M5X80 long bolts evenly distributed circumferentially on its front support casing. These bolts secure the squirrel cage support. During assembly, tweezers are needed to align each of the six bolts with its corresponding bolt hole on the squirrel cage support and insert them simultaneously. During assembly, the shortest distance between the bolts / squirrel cage support and the inner wall of the front support casing is no more than 10mm, and the center of the entire bolt circle is the journal of the main shaft, making the space confined, difficult, and time-consuming. To improve this situation, a bolt positioning fixture is provided, enabling simultaneous positioning of all six bolts without interfering with other parts. This fixture is easy to operate, allows for rapid assembly, and improves production efficiency. Utility Model Content

[0003] The purpose of this utility model is to solve the problem in the prior art that during assembly, the shortest distance between the bolts and the cage support and the inner wall of the front support casing is no more than 10mm, the center of the entire bolt circle is the journal of the main shaft, the space is narrow, the operation is difficult and the time is long. Therefore, a bolt positioning tool for turbojet engines in narrow space is proposed.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A bolt positioning fixture for a turbojet engine in a confined space, comprising: Upper positioning plate; The lower positioning disk is connected to the upper positioning disk via a positioning component; Specifically, pulling up the upper positioning disk drives the positioning component to retract, thus performing disassembly; With the lower positioning disk blocked at the main spindle journal, the upper positioning disk moves downward under the action of gravity, thereby driving the positioning assembly to unfold and position.

[0005] Furthermore, the positioning component includes: A pull rod, one end of which is rotatably connected to the connecting part of the upper positioning plate; The positioning claw has a square through hole, which is rotatably connected to one end of the pull rod, and one end of the positioning claw is rotatably connected to the connecting part of the lower positioning plate.

[0006] Furthermore, an arc-shaped groove is provided at the other end of the positioning claw.

[0007] Furthermore, there are six positioning components.

[0008] Furthermore, the upper positioning disk has a first through hole in the middle, and the lower positioning disk has a second through hole.

[0009] Furthermore, the lower port diameter of the first through hole is larger than the upper port diameter of the first through hole, the lower port diameter of the second through hole is larger than the upper port diameter of the second through hole, and the upper port diameter of the second through hole is larger than the lower port diameter of the first through hole.

[0010] Furthermore, the upper positioning plate, positioning component, and lower positioning plate are all made of 304 stainless steel.

[0011] Compared with existing technologies, the advantages of this invention are: This invention involves fitting the entire positioning fixture onto the journal of the main shaft inside the turbojet engine. The lower positioning plate of the fixture contacts the end face of the journal of the main shaft, limiting the positioning plate. The upper positioning plate moves downward under the action of gravity, driving the pull rod to expand the positioning claws in all directions to position the inner side of the bolts. This achieves the positioning of the bolts inside the turbojet engine, facilitating the alignment of parts with the bolts and reducing the difficulty of operation, thus improving assembly production efficiency. After the squirrel cage support of the turbojet engine is installed, the upper positioning plate is pulled up to drive the positioning assembly, causing the positioning claws to retract and avoid the squirrel cage support, thus achieving quick disassembly of the entire positioning fixture. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of a bolt positioning fixture for a turbojet engine in a confined space, as proposed in this utility model.

[0013] Figure 2 This is a schematic cross-sectional view of a bolt positioning fixture for a turbojet engine in a confined space, as proposed in this utility model.

[0014] Figure 3 This utility model provides a schematic diagram of the cross-section of the positioning claw when the positioning bolt is deployed in a confined space for a turbojet engine.

[0015] Figure 4 This is a top view of the bolt positioning tool for a turbojet engine in a confined space, as proposed in this utility model, showing the retracting and removal of the positioning claw during use.

[0016] Figure 5 This utility model provides a schematic diagram of the cross-section of a bolt positioning fixture for a turbojet engine in a confined space, showing the retraction and removal of the positioning claw during use.

[0017] In the diagram: 1. Upper positioning plate, 2. Pull rod, 3. Positioning claw, 4. Lower positioning plate, 5. Pin, 6. Bolt, 7. Squirrel cage support, 8. Main shaft, 9. Front support housing. Detailed Implementation

[0018] The present invention will be further explained below with reference to the accompanying drawings.

[0019] like Figure 1-2 As shown, this utility model provides a bolt positioning fixture for a turbojet engine in a confined space, including: an upper positioning plate 1, a positioning component, and a lower positioning plate 4.

[0020] The upper positioning plate 1 is connected to the lower positioning plate 4 through 6 sets of positioning components.

[0021] Pulling up the positioning plate 1 can drive 6 sets of positioning components to retract simultaneously, thus facilitating the removal of the bolt positioning fixture during disassembly in the confined space of the turbojet engine.

[0022] With the main shaft 8 journal blocked, the lower positioning plate 4 is limited, and the upper positioning plate 1 moves down under the action of gravity to drive the positioning assembly to unfold and position the bolt 6 inside the turbojet engine, so that the bolt 6 is aligned with the mounting hole of the squirrel cage support 7, making it easier to install the squirrel cage support 7, thereby reducing the difficulty of operation and improving the assembly production efficiency.

[0023] In this embodiment, the upper positioning disk 1 is integrally formed from a cylindrical part, a first base plate and several connecting plates. The upper positioning disk 1 has a first through hole in the middle. The diameter of the lower end of the first through hole is larger than the diameter of the upper end of the first through hole, which makes it easy for the upper positioning disk 1 to fit onto the main shaft inside the turbojet engine and cooperate with the main shaft inside the turbojet engine. At the same time, the upper end of the cylindrical part of the upper positioning disk 1 is rounded, which improves the structural strength of the upper end of the upper positioning disk 1 and prevents personnel from being scratched during operation or contact.

[0024] The lower positioning plate 4 is integrally formed from the second base plate and several connecting plates. The lower positioning plate 4 has a second through hole in the middle. The lower port of the second through hole is larger than the diameter of the upper port of the second through hole, and the diameter of the upper port of the second through hole is larger than the diameter of the lower port of the first through hole. This makes it easy for the lower positioning plate 4 to be fitted onto the main shaft inside the turbojet engine and to cooperate with the journal of the main shaft 8 inside the turbojet engine.

[0025] The positioning assembly includes a pull rod 2 and a positioning claw 3.

[0026] One end of the pull rod 2 is rotatably connected to the pin 5 and is connected to the connecting plate of the upper positioning plate 1 through the pin 5. The other end of the pull rod 2 is rotatably connected to the pin 5 in the square through hole of the positioning claw 3, thereby realizing that pulling up the positioning plate 1 drives the pull rod 2 to move, and then the pull rod 2 drives the positioning claw 3 to retract.

[0027] One end of the positioning claw 3 is rotatably connected to the pin 5 on the connecting plate of the lower positioning disk 4. The other end of the positioning claw 3 has an arc-shaped groove, which can push the lower positioning disk 4 to drive the positioning claw 3 to unfold and position the bolt 6 facing the arc-shaped groove. The arc-shaped groove design at one end of the positioning claw 3 allows the positioning claw 3 to fit tightly against the surface of the bolt 6 when positioning the bolt 6, resulting in a better positioning effect.

[0028] The upper positioning plate 1, the positioning component, and the lower positioning plate 4 are all made of 304 stainless steel.

[0029] like Figure 3-5 As shown, during use, the entire turbojet engine confined space bolt positioning fixture is first inserted into the middle of the squirrel cage support 7. The inner hole of the lower positioning plate 4 is fitted with a small clearance to the journal of the main shaft 8, ensuring that the positioning claw 3 is accurately positioned when the entire turbojet engine confined space bolt positioning fixture is installed. When the fixture is installed, the lower positioning plate 4 is pressed against the shaft end face, and the positioning claw 3 unfolds to position the inner side of the bolt 6 on the front support housing 9. Due to the limitation of the center opening length of the positioning claw 3, the upper positioning plate 1 will not descend further when it is pressed down until the positioning claw 3 is horizontal. After the fixture is unfolded, the pull rod 2 and the positioning claw 3 form a triangular stable support. When the fixture is removed, the upper positioning plate 1 is pulled up, and the upper positioning plate 1 drives the pull rod 2 to move, thereby causing the positioning claw 3 to retract. Due to the limitation of the opening length of the positioning claw, the positioning claw will retract to a size smaller than the inner hole diameter of the squirrel cage support 7. The entire turbojet engine confined space bolt positioning fixture can directly pass through the squirrel cage support, avoiding interference with the squirrel cage support 7, and achieving quick disassembly and assembly.

[0030] In addition, if the distance between the front support housing 9 and the bolt 6 is different, positioning can also be achieved by replacing the tie rod 2 and the positioning claw 3 with different lengths, thus realizing the universality and practicality of the bolt positioning tooling in the narrow space of the entire turbojet engine.

[0031] This invention, in use, involves mounting the bolt positioning fixture within the confined space of the turbojet engine onto the journal of the main shaft 8. This obstructs the lower positioning plate 4 from the journal of the main shaft 8, limiting its position. The upper positioning plate 1 then moves downwards under gravity, driving the pull rod 2 to expand the positioning claw 3 outwards to position the inner side of the bolt 6. When the positioning claw 3 reaches a horizontal position and stops descending, the pull rod 2 and the positioning claw 3 form a stable triangular support, thus providing stable positioning of the inner side of the bolt 6. This achieves the positioning of multiple bolts 6 within the confined space inside the engine, improving assembly accuracy. To improve efficiency and reduce operational difficulty, when removing and disassembling the entire bolt positioning fixture in the confined space of the turbojet engine, the upper positioning plate 1 is pulled up, which drives the pull rod 2 to move, thereby causing the positioning claw 3 to retract, making it smaller than the inner diameter of the squirrel cage support 7. This allows the entire bolt positioning fixture in the confined space of the turbojet engine to pass directly through the squirrel cage support 7, avoiding interference with it. At the same time, each part of the bolt positioning fixture in the confined space of the turbojet engine can be replaced individually, and it can be used for positioning bolts 6 in different positions, adapting to the positioning of bolts 6 in complex positions.

[0032] As is known from common technical knowledge, this utility model can be implemented through other simple modifications. As long as these modifications do not depart from the spirit or essential characteristics of this utility model, they all fall within the protection scope of this utility model. Therefore, the disclosed embodiments described above are merely illustrative examples and not the only ones. All changes within the scope of this utility model or its equivalents are included in this utility model.

Claims

1. A bolt positioning fixture for a confined space in a turbojet engine, characterized in that, include: Upper positioning plate (1); The lower positioning disk (4) is connected to the upper positioning disk (1) via a positioning component; Among them, pulling up the upper positioning disk (1) drives the positioning component to retract, so as to disassemble; With the main shaft (8) journal blocking, the lower positioning disk (4) is limited, and the upper positioning disk (1) moves down under the action of gravity to drive the positioning component to unfold and position.

2. The bolt positioning fixture for a turbojet engine in a confined space according to claim 1, characterized in that: The positioning component includes: Pull rod (2), one end of which is rotatably connected to the connecting part of the upper positioning plate (1); The positioning claw (3) has a square through hole, which is rotatably connected to one end of the pull rod (2), and one end of the positioning claw (3) is rotatably connected to the connecting part of the lower positioning plate (4).

3. The bolt positioning fixture for a turbojet engine in a confined space according to claim 2, characterized in that: The other end of the positioning claw (3) has an arc-shaped groove.

4. The bolt positioning fixture for a turbojet engine in a confined space according to claim 2, characterized in that: There are 6 positioning components.

5. The bolt positioning fixture for a turbojet engine in a confined space according to claim 1, characterized in that: The upper positioning disk (1) has a first through hole in the middle, and the lower positioning disk (4) has a second through hole.

6. The bolt positioning fixture for a turbojet engine in a confined space according to claim 5, characterized in that: The diameter of the lower port of the first through hole is greater than the diameter of the upper port of the first through hole, the diameter of the lower port of the second through hole is greater than the diameter of the upper port of the second through hole, and the diameter of the upper port of the second through hole is greater than the diameter of the lower port of the first through hole.

7. The bolt positioning fixture for a turbojet engine in a confined space according to claim 1, characterized in that: The upper positioning plate (1), positioning component and lower positioning plate (4) are all made of 304 stainless steel.

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