Convenient dismounting device for counter-pressure bushing

Abstract

The utility model discloses a convenient dismounting device for a counter-pressure bushing, which belongs to the technical field of aviation product maintenance and comprises a step shaft and a slotted shaft sleeve which are connected with each other. The step shaft comprises a transition section, and a handheld section and a mounting section a are integrally formed at the two ends of the transition section correspondingly. The slotted shaft sleeve comprises an installation section b and a reducing section which are integrally formed, the installation section b is connected with the installation section a in a matched mode, and a protrusion is fixedly connected to the outer wall of the end, away from the installation section b, of the reducing section. According to the utility model, the variable-diameter section on the slotted shaft sleeve is slotted, so that the variable-diameter section is equally divided, and the variable-diameter section is rebounded after the outer diameter of the variable-diameter section is reduced and the variable-diameter section goes deep into the bushing to be disassembled by utilizing the physical property of rebounding of the variable-diameter section, and the bushing to be disassembled is disassembled by applying force through the bulge penetrating into the clearance of the bushing; the technical problem that in the prior art, due to limitation of the operation space and in order to prevent other parts from being damaged, various devices and tools are inconvenient to carry or use, and the aircraft maintenance process is complex and lengthy is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of aviation product maintenance, and in particular relates to a convenient disassembly device for a pressure bushing. Background Art

[0002] During the frequent use of the aircraft, the bushing on the main joint of the actuator connection of the wing spoiler is obviously worn, so it is necessary to replace the worn bushing. In addition, the bushing is often worn during the maintenance and troubleshooting of the aircraft, and it needs to be replaced in time when it is found. Especially for the pressure bushing in the through-hole parts, when replacing the bushing, due to the limitation of the operating space, the operating range of replacing the bushing is small, and in order to prevent damage to other parts, various equipment and tools are inconvenient to carry or use, etc., resulting in a complicated and lengthy aircraft maintenance process.

[0003] For the assembly form of two bushings with bosses pressed against each other in the through hole of the ear piece or bushings in the blind hole, it is very difficult to disassemble the bushings in the parts production workshop, and special equipment or special tools are required to operate. Especially in the field environment, there is a lack of various types of special equipment and other convenient conditions. In general, the bushing can only be disassembled by the method of destructive grinding of the bushing by fitters or tapping the inner hole of the bushing. Both methods are prone to cause damage to the bottom hole or other surfaces of the part. In special cases, if the main joint of the part is damaged, it may cause the entire spoiler component to be scrapped, affecting the aircraft mission and causing significant losses. Utility Model Content

[0004] The purpose of the utility model is to provide a convenient disassembly device for a pressure bushing, which solves the technical problem in the prior art that due to the limitation of operating space and in order to prevent damage to other parts, various equipment and tools are inconvenient to carry or use, resulting in a complicated and lengthy aircraft maintenance process.

[0005] The technical solution adopted by the utility model is a convenient disassembly device for a pressure bushing, comprising a stepped shaft and a slit shaft sleeve connected to each other; the stepped shaft comprises a transition section, and both ends of the transition section are respectively integrally formed with a hand-held section and an installation section a; the slit shaft sleeve comprises an integrally formed installation section b and a reducing section, the installation section b is cooperatively connected with the installation section a, and a protrusion is fixedly connected to the outer wall of the end of the reducing section away from the installation section b.

[0006] The utility model is also characterized in that:

[0007] The outer diameters of the hand-held section, the transition section and the installation section a decrease in sequence, and the outer diameter of the transition section is greater than the inner diameter of the installation section b.

[0008] An end of the installation section a facing away from the transition section is provided with a chamfer.

[0009] The variable-diameter section and the protrusion are symmetrically grooved along the axial direction, and the variable-diameter section is equally divided by the grooves.

[0010] A necking section is provided at the variable-diameter section near the installation section b, and the outer diameter of the necking section is smaller than the outer diameter of the variable-diameter section far from the installation section b.

[0011] The beneficial effects of the present utility model are as follows:

[0012] By grooving the variable-diameter section of the slotted shaft sleeve in the present utility model, the variable-diameter section is equally divided. Then, using its recoverable physical property, its outer diameter is reduced and it rebounds after penetrating into the bushing to be disassembled. The protrusion penetrating into the clearance of the bushing applies a force to the bushing to be disassembled for removal, solving the technical problems in the prior art that due to the limitation of the operating space and to prevent damage to other parts, various equipment and tools are inconvenient to carry or use, resulting in a complex and lengthy aircraft maintenance process. It effectively improves the quality and efficiency of aircraft maintenance and greatly reduces the risk of component scrapping caused by matrix damage during maintenance. The present utility model can meet the requirements of press-fit bushings on special structural parts such as single-ear press-fit bushings, double-ear press-fit bushings, and deep-hole bushings, and meet the needs of different working conditions. Description of the Drawings

[0013] Figure 1 is a schematic structural diagram of the convenient disassembly device for the press-fit bushing of the present utility model;

[0014] Figure 2 is Figure 1 a schematic structural diagram of the position A in

[0015] Figure 3 is Figure 1 a schematic structural diagram of the position B in

[0016] Figure 4 is a schematic structural diagram of the slotted shaft sleeve in the convenient disassembly device for the press-fit bushing of the present utility model;

[0017] Figure 5 is Figure 4 the front view of

[0018] Figure 6 is a schematic structural diagram of the stepped shaft in the convenient disassembly device for the press-fit bushing of the present utility model;

[0019] Figure 7 is a schematic dimension diagram of the slotted shaft sleeve in the convenient disassembly device for the press-fit bushing of the present utility model;

[0020] Figure 8 is a schematic dimension diagram of the stepped shaft in the convenient disassembly device for the press-fit bushing of the present utility model.

[0021] In the figure, 1. stepped shaft, 101. handheld section, 102. transition section, 103. mounting section a, 104. chamfer, 2. slotted bushing, 201. mounting section b, 202. necking section, 203. groove, 204. diameter-changing section, 205. protrusion, 3. bushing, 4. base body. Detailed implementation manners

[0022] The present utility model will be further explained and illustrated below in conjunction with the accompanying drawings and detailed implementation manners.

[0023] Regarding the maintenance of aircraft components, some small components cannot be disassembled and maintained separately, and can only be maintained on the aircraft or on the components. Limited by the maintenance working conditions and the requirements of foreign object control, large tools cannot be operated, and it is easy to cause secondary damage to the components, resulting in a relatively high maintenance risk. Therefore, there is an urgent need for a convenient disassembly device for press bushings to solve the above problems.

[0024] Embodiment 1

[0025] As Figures 1-6 shown, the convenient disassembly device for press bushings disclosed by the present utility model includes a stepped shaft 1 and a slotted bushing 2 which are connected to each other; the stepped shaft 1 includes a transition section 102, and a handheld section 101 and a mounting section a 103 are integrally formed at both ends of the transition section 102 respectively; the slotted bushing 2 includes a mounting section b 201 and a diameter-changing section 204 which are integrally formed, the mounting section b 201 is in mating connection with the mounting section a 103, and a protrusion 205 is fixedly connected to the outer wall of the end of the diameter-changing section 204 away from the mounting section b 201. Grooves 203 are symmetrically formed along the axial direction on the diameter-changing section 204 and the protrusion 205, and the diameter-changing section 204 is equally divided by the grooves 203.

[0026] The present utility model can meet the maintenance disassembly requirements in different working environments, has good versatility, and reduces the labor intensity and risk of operators, thereby improving the operation efficiency and operation quality. The present utility model equally divides the diameter-changing section 204 on the slotted bushing 2 by the symmetrically arranged grooves 203. At this time, based on the physical properties of the slotted bushing 2 itself, when an external radially applied force is applied to the diameter-changing section 204, the external dimension will gradually decrease along the direction away from the mounting section b 201. At this time, the protrusion 205 is inserted into the inner hole of the bushing 3 to be removed, and the radially applied force on the diameter-changing section 204 is cancelled. When the protrusion 205 enters the gap between the two bushings 3, based on the physical properties of the slotted bushing 2 itself, its dimension rebounds to the original state. At this time, the side wall of the protrusion 205 abuts against the bushing 3, and the bushing 3 can be forced to be disassembled. The present utility model solves the technical problem in the prior art that due to the limitation of the operation space and in order to prevent damage to other parts, various equipment and tools are inconvenient to carry or use, resulting in a complex and lengthy aircraft maintenance process.

[0027] Embodiment 2

[0028] On the basis of Embodiment 1, the outer diameters of the handheld section 101, the transition section 102, and the mounting section a 103 decrease in sequence. The outer diameter of the transition section 102 is greater than the inner diameter of the mounting section b 201. A chamfer 104 is provided at one end of the mounting section a 103 away from the transition section 102. A necking section 202 is provided at the variable diameter section 204 near the mounting section b 201, and the outer diameter of the necking section 202 is smaller than the outer diameter of the variable diameter section 204 away from the mounting section b 201.

[0029] In the present utility model, the outer diameters of the handheld section 101, the transition section 102, and the mounting section a 103 are set to decrease in sequence, avoiding the situation that during actual disassembly, when the stepped shaft 1 does not have a gradient dimension, it is easy to insert the entire stepped shaft 1 deep into the inner hole of the bushing 3, causing injury to the staff; and through the setting of the transition section 102, the mounting section b 201 is clamped on the side edge of the transition section 102, without the need for other forms of connection structures for connection, which saves time and effort.

[0030] Embodiment 3

[0031] Based on the narrow space for maintenance operations and other different working conditions, the present utility model describes the stepped shaft 1 and the slotted bushing 2 according to the dimensions of the bushing and the bottom hole of the main body. Combining Figure 7 and Figure 8 , in the present utility model, the slotted bushing 2 is composed of a slotted stepped steel pipe with a length of L and a diameter of d. Among them, L1 is the length of the variable diameter section 204, L - L1 is the length of the mounting section b 201, and L1 - L2 is the length of the necking section 202; l is the length of the stepped shaft 1, l - l1 is the length of the mounting section a, l2 is the length of the handheld section 101, and l1 - l2 is the length of the transition section 102. The values of the lengths L and l are not fixed and can be determined by the matrix where the bushing is located and the size of the maintenance space; the diameter d of the slotted steel pipe is not fixed either. The diameter d of the slotted steel pipe can be determined by the inner diameter of the disassembled bushing 3, and the size D of the protrusion 205 on the slotted bushing 2 is determined by the outer diameter of the bushing 3, generally not greater than the outer diameter size of the bushing 3; the thickness H of the protrusion 205 is determined according to the clearance value between the press-fit bushings 3. The slotted size h of the slotted bushing 2 is about 2 - 4 mm, that is, the width of the groove 203 is about 2 - 4 mm, and this gap can be processed by wire cutting. In addition, at the root of the gap of the slotted bushing 2, a sunken diameter with a diameter of d1 and a length of L1 - L2 needs to be processed, that is, the necking section 202. The main function of this sunken diameter is to facilitate the closing of the protrusion 205 by reducing the wall thickness of the variable diameter section 204, so as to facilitate entry into the inner diameter of the bushing 3.

[0032] The main function of the stepped shaft 1 is to cooperate with the slotted bushing 2, and slowly use an axial external force to disassemble the bushing 3 from the part matrix 4, so as to ensure the aperture size and surface quality of the matrix 4. When disassembling, it is necessary to apply force evenly from the gap between the two bushings 3 to avoid damaging the parts.

[0033] In practical applications, there are usage situations different from those disclosed in the present utility model, such as the bushing 3 in a blind hole. For the disassembly of the bushing 3 in a blind hole, the principle is the same as that of the open-hole bushing 3 of the present utility model, and the difference lies in that the direction of the force is opposite.

[0034] When there is a need to disassemble the bushing 3, first, according to the dimensions of the bushing and the bottom hole of the main body, as well as the maintenance working conditions, design the stepped shaft 1 and the slotted bushing 2 with corresponding dimensions, specifically:

[0035] When the bottom hole of the matrix 4 is Φ, the outer diameter of the bushing is Φ1, the inner diameter of the bushing is Φ2, and the bottom hole Φ of the part and the outer diameter Φ1 of the bushing are in an interference fit, and Φ1 - Φ2 ≈ 3 - 10 mm, then the dimensional data of the slotted bushing 2 are as follows: Φ - D = 0.3 - 0.5 mm, h ≈ 0.13D, H ≈ 0.10D, d ≈ D - 2, d1 ≈ D - 2.6, d2 ≈ D - 3.6. The length L of the slotted bushing is determined according to the actual working conditions, L1 ≈ L - d, L2 ≈ L1 - d1.

[0036] The dimensional data of the stepped shaft 1 are as follows: d2 - D3 = 0.2 - 0.4 mm, D3 - D4 = 2, the height of the transition zone from diameter D3 to D4 is about 5 mm, that is, the height of the chamfer 104 is about 5 mm, D2 = d + 3. The length L of the stepped shaft is determined according to the actual working conditions, and factors such as the disassembly operation space need to be considered. l1 ≈ l - 2 * D3, l2 ≈ l1 - 2 * D2, and the D1 dimension is also determined according to the working conditions. Generally, D1 = D2 + 5.

[0037] The usage method of the present utility model is as follows:

[0038] During on-site use, first put the protrusion 205 of the slotted bushing 2 into the gap between the two bushings 3 by manually pressing and closing the opening, then insert the installation section a103 of the stepped shaft into the installation section b201 of the slotted bushing 2, and then by applying external force evenly to the handheld section 101 of the stepped shaft multiple times, the bushing 3 to be disassembled can be slowly withdrawn from the bottom hole of the matrix 4, and at the same time, the bottom hole of the matrix 4 can be prevented from being damaged.

Claims

1. A convenient disassembly device for a pressing bushing, characterized in that, It includes a stepped shaft (1) and a slotted bushing (2) that are connected to each other; the stepped shaft (1) includes a transition section (102), and a hand-held section (101) and an installation section a (103) are integrally formed at both ends of the transition section (102); the slotted bushing (2) includes an integrally formed installation section b (201) and a stepped diameter section (204), the installation section b (201) is connected to the installation section a (103) in a matching manner, and a protrusion (205) is fixedly connected to the outer wall of the end of the stepped diameter section (204) away from the installation section b (201).

2. The convenient disassembly device for the counter pressure bushing according to claim 1, wherein The outer diameters of the hand-held section (101), the transition section (102), and the installation section a (103) decrease in sequence, and the outer diameter of the transition section (102) is greater than the inner diameter of the installation section b (201).

3. The convenient disassembly device for the compression bushing according to claim 2, characterized in that, A chamfer (104) is provided at one end of the installation section a (103) away from the transition section (102).

4. The convenient disassembly device for the counter pressure bushing according to claim 1, characterized in that, Grooves (203) are symmetrically opened along the axial direction on the stepped diameter section (204) and the protrusion (205), and the grooves (203) equally divide the stepped diameter section (204).

5. The convenient disassembly device for the pressing bushing according to claim 4, wherein, A necking section (202) is provided at the stepped diameter section (204) near the installation section b (201), and the outer diameter of the necking section (202) is smaller than the outer diameter of the stepped diameter section (204) away from the installation section b (201).

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