A tool for removing a bearing housing copper bushing of an aircraft auxiliary power unit

Abstract

The utility model discloses a kind of aircraft auxiliary power device bearing oil return pipe copper sleeve extraction tools, it includes slide bar and sliding block, one end of the slide bar is fixedly connected with tap, and limit portion is equipped on the slide bar;The copper sleeve is connected with the tap thread;The sliding block is slidably connected on the slide bar, and can be abutted with the limit portion.Using the utility model, copper sleeve local stress concentration in the operation process can be avoided, to make copper sleeve deformation, at the same time, the labor intensity of maintenance personnel can also be reduced, and operation safety performance is also improved.

Description

Technical Field

[0001] This utility model relates to the field of aircraft auxiliary power unit (APU) maintenance technology, and in particular to a tool for removing the copper sleeve of the oil return pipe in the bearing cavity of an aircraft auxiliary power unit. Background Technology

[0002] As a critical backup energy system, the installation and removal of the copper bushing in the bearing cavity return oil pipe of the aircraft auxiliary power unit (APU) is a crucial step in maintenance operations. For example... Figure 1 As shown, the copper sleeve 2 is installed inside the oil return pipe 1. The standard operating procedure for removing the copper sleeve from the bearing cavity oil return pipe, which is commonly used in the industry, is the hook prying removal method. That is, by inserting the tip of the hook into the gap between the copper sleeve 2 and the oil return pipe 1, and using wrist force to pry the edge of the copper sleeve, repeatedly adjusting the angle and trying 3-5 times until the copper sleeve comes out.

[0003] However, this method of dismantling has the following drawbacks: (1) The existing hook tool uses a single-point contact force application method, which will cause severe stress concentration in the local area of ​​the copper sleeve during operation, which will easily lead to deformation of the copper sleeve; at the same time, the force application direction of the hook is at a large angle with the axis of the copper sleeve, causing the copper sleeve to tilt in the pipe hole of the return oil pipe, which will easily cause the hook and the copper sleeve to be mechanically locked and difficult to dismantle; in addition, maintenance personnel often need to apply instantaneous impact force to loosen the copper sleeve, and this dynamic load is likely to cause micro-cracks in the return oil pipe body; (2) Maintenance personnel use wrist force, which is prone to fatigue during long-term operation, and there are also safety hazards, namely, the hook slippage and the flying metal chips are likely to injure the operator. Utility Model Content

[0004] The purpose of this utility model is to provide a tool for removing the copper sleeve of the oil return pipe in the bearing cavity of an aircraft auxiliary power unit. This tool can avoid local stress concentration in the copper sleeve during operation, which could cause deformation of the copper sleeve. At the same time, it can also reduce the labor intensity of maintenance personnel and improve the safety of operation.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A tool for removing the copper sleeve from the oil return pipe of an aircraft auxiliary power unit bearing cavity includes a slide rod and a slider. One end of the slide rod is fixedly connected to a tap, and a limiting part is provided on the slide rod. The copper sleeve is threadedly connected to the tap. The slider is slidably connected to the slide rod and can abut against the limiting part.

[0006] As a preferred embodiment of this utility model, the end of the slide bar away from the tap is provided with a handle.

[0007] As a preferred embodiment of this utility model, the slider has a channel inside for sliding engagement with the slide rod; the inner diameter of the channel is larger than the diameter of the tap and the diameter of the slide rod.

[0008] As a preferred embodiment of this utility model, the slide bar and the tap are an integral structure.

[0009] As a preferred embodiment of this utility model, the sliding rod is made of steel.

[0010] As a preferred embodiment of this utility model, the tap is made of steel.

[0011] As a preferred embodiment of this utility model, the slider is made of steel.

[0012] As a preferred embodiment of this utility model, the slide bar is welded to the tap.

[0013] The tool for removing the copper sleeve from the return oil pipe of the bearing cavity of an aircraft auxiliary power unit provided by this utility model has the following advantages compared with the prior art: This utility model discloses a tool for removing the copper sleeve from the return oil pipe of the bearing cavity of an aircraft auxiliary power unit. It utilizes a tap-threaded connection with the copper sleeve, which, compared to the single-point contact of traditional hook tools, allows the tap to generate a sufficiently effective and stable circumferential gripping force on the copper sleeve, preventing localized stress concentration and deformation during operation. Secondly, it is simpler to operate and avoids mechanical locking between the hook and the copper sleeve. Furthermore, the operator uses the impact force of the slider to separate the copper sleeve and the slider rod from the return oil pipe, ultimately removing the copper sleeve smoothly. Compared to the wrist-based method used by maintenance personnel with hook tools, this reduces labor intensity and improves operational safety. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly described below.

[0015] Figure 1 This is a schematic diagram of the return oil pipe and copper sleeve; Figure 2 This is a schematic diagram of the structure of a tool for removing the copper sleeve of the oil return pipe in the bearing cavity of an aircraft auxiliary power unit, provided in an embodiment of this utility model. Figure 3 This is a schematic diagram of the slide bar and tap. Figure 4 This is a schematic diagram of the slider's structure; Figure 5 This is a schematic diagram of the threaded connection between the tap and the copper sleeve; Figure 6 This is a schematic diagram showing the release of the slider to separate the copper sleeve and slide rod from the return oil pipe.

[0016] Marked in the image: 1. Oil return pipe; 2. Copper sleeve; 3. Slide rod; 31. Tap; 32. Limiting part; 4. Slider; 41. Channel; 5. Handle. Detailed Implementation

[0017] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0018] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. It should also be understood that the terms "first," "second," etc., are used in this utility model to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this utility model, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information.

[0019] Please see Figures 2 to 6 A preferred embodiment of this utility model provides a tool for removing the copper sleeve of the oil return pipe in the bearing cavity of an aircraft auxiliary power unit, including a slide rod 3 and a slider 4. One end of the slide rod 3 is fixedly connected to a tap 31, and a limiting part 32 is provided on the slide rod 3. The copper sleeve 2 is threadedly connected to the tap 31. The slider 4 is slidably connected to the slide rod 3 and can abut against the limiting part 32. The slider 4 has a channel 41 inside that allows the slide rod 3 to slide and engage. The inner diameter of the channel 41 is larger than the diameter of the tap 31 and the diameter of the slide rod 3.

[0020] According to the present invention, the tool for removing the copper sleeve of the return oil pipe in the bearing cavity of the aircraft auxiliary power unit is used such that, when the return oil pipe 1 is installed in the bearing cavity of the aircraft auxiliary power unit, the return oil pipe 1 is in a relatively fixed state. Then, threads are tapped inside the copper sleeve 2, and the tap 31 is threadedly connected to the copper sleeve 2, so that the tap 31 bites firmly and grips the copper sleeve 2. Then, the operator holds the end of the slide bar 3 away from the tap 31 and drives the slider 4 to slide down from top to bottom, so that the slider 4 abuts against the limiting part 32 on the slide bar 3, and finally the slide bar 3 and the copper sleeve 2 are separated from the return oil pipe 1, and the copper sleeve 2 is finally removed.

[0021] As can be seen, the tool for removing the copper sleeve from the return oil pipe of the aircraft auxiliary power unit bearing cavity of this utility model utilizes the threaded connection between the tap 31 and the copper sleeve 2. Compared with the single-point contact force application method of the traditional hook tool, the tap 31 can form a sufficiently effective and stable circumferential gripping force on the copper sleeve 2, avoiding local stress concentration on the copper sleeve 2 during operation, which could cause deformation of the copper sleeve 2. Secondly, it is simpler to operate and can avoid the phenomenon of mechanical locking between the hook and the copper sleeve 2. In addition, the operator can use the impact force of the slider 4 to separate the copper sleeve 2 and the slider 3 from the return oil pipe 1 together, and finally successfully remove the copper sleeve 2. Compared with the method of maintenance personnel using the wrist force of the hook tool, it can reduce the labor intensity and improve the operation safety performance.

[0022] For example, to facilitate the user's grip on the slide bar 3, a handle 5 is provided at the end of the slide bar 3 away from the tap 31.

[0023] For example, to facilitate production and manufacturing, the slide bar 3 and the tap 31 are an integral structure.

[0024] For example, to improve the overall structural strength of the tool, the slide bar 3, the tap 31, and the slider 4 are all made of steel.

[0025] For example, to increase the connection strength between the tap 31 and the slide bar 3, the tap 31 is welded to the slide bar 3.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A tool for removing the copper sleeve from the oil return pipe of an aircraft auxiliary power unit bearing cavity, characterized in that, The device includes a sliding rod and a slider. One end of the sliding rod is fixedly connected to a tap, and a limiting part is provided on the sliding rod. The copper sleeve is threadedly connected to the tap. The slider is slidably connected to the sliding rod and can abut against the limiting part.

2. The tool for removing the copper sleeve from the return oil pipe of the aircraft auxiliary power unit bearing cavity according to claim 1, characterized in that, The slide bar has a handle at the end away from the tap.

3. The tool for removing the copper sleeve from the return oil pipe of the aircraft auxiliary power unit bearing cavity according to claim 1, characterized in that, The slider has an internal channel for sliding engagement with the slide rod; the inner diameter of the channel is larger than the diameter of the tap and the diameter of the slide rod.

4. The tool for removing the copper sleeve from the oil return pipe of the aircraft auxiliary power unit bearing cavity according to claim 1, characterized in that, The slide bar and the tap are an integral structure.

5. The tool for removing the copper sleeve from the oil return pipe of the aircraft auxiliary power unit bearing cavity according to claim 1, characterized in that, The slide bar is made of steel.

6. The tool for removing the copper sleeve from the oil return pipe of the aircraft auxiliary power unit bearing cavity according to claim 1, characterized in that, The tap is made of steel.

7. The tool for removing the copper sleeve from the return oil pipe of the aircraft auxiliary power unit bearing cavity according to claim 1, characterized in that, The slider is made of steel.

8. The tool for removing the copper sleeve from the oil return pipe of the bearing cavity of an aircraft auxiliary power unit according to claim 1, characterized in that, The slide bar is welded to the tap.

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