Dimple limiting depth-setting sleeve

Abstract

The utility model discloses a dimple limiting depth-keeping sleeve, which comprises a sleeve, a main shaft which reciprocates in the axial direction is arranged on the inner side of the sleeve; one side of the main shaft is connected with a driving assembly to drive the main shaft to rotate; the outer side of the main shaft is annularly sleeved with a limiting assembly, and the limiting assembly is used for limiting the main shaft when the main shaft moves and resets. According to the device, the limiting assembly is arranged on the outer side of the main shaft, one end of the main shaft is designed to be the stepped rotating shaft, the spring and the bearing on the inner side of the sleeve are limited, reciprocating motion between the main shaft and the sleeve is not affected, and meanwhile the supporting strength of the depth setting sleeve is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of aerospace equipment, in particular to a countersinking position limiting and depth-fixing sleeve. Background Art

[0002] During the aircraft assembly process, the skin shell needs to be kept as smooth as possible without any protrusions. Therefore, a large number of fasteners with countersunk heads will be used, and a large number of countersunk holes need to be drilled on the skin. The existing processing technology in the aircraft assembly process will first drill holes and then use fixed depth sleeves to perform countersunk processing.

[0003] The countersinking depth limitation on the inner side of the depth-fixing sleeve mainly relies on the internal spring and the retaining ring above the spring (generally in the shape of concentric circles). However, during the countersinking and drilling process of the skin, the main shaft of the depth-fixing sleeve is subjected to a large continuous downward pressure, and the limitation can only be achieved after the internal spring is compressed to its elastic limit. At this time, the retaining ring is subject to the elastic force of the spring and the downward pressure of the main shaft, and is prone to fatigue damage. After the retaining ring is damaged, the spring will elastically reset upward, and a limiting structure is missing between the spring and the main shaft, resulting in the main shaft being unable to be limited by the retaining ring during the downward pressure process. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a countersinking limiting depth-fixing sleeve.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solution: a countersinking limit depth setting sleeve, comprising:

[0006] Sleeve;

[0007] A main shaft is arranged inside the sleeve and moves back and forth in the axial direction;

[0008] One side of the main shaft is connected to a driving assembly to drive the main shaft to rotate;

[0009] The outer ring sleeve of the main shaft is provided with a limiting component to limit the main shaft when it is moved and reset.

[0010] As a further description of the above technical solution: a first protective shell and a second protective shell are arranged on the outer side of the sleeve, the second protective shell is connected to the sleeve by threads, and the first protective shell and the second protective shell are abutted against each other.

[0011] As a further description of the above technical solution: the limiting assembly includes a first spring and a second spring, and a volume cavity is formed between the first protective shell and the sleeve, so that the first spring is placed inside the volume cavity.

[0012] As a further description of the above technical solution: a first locking ring is provided on one side of the first protective shell, and the first locking ring is connected to the sleeve through threads.

[0013] As a further description of the above technical solution: a pin hole is arranged on the side of the main shaft close to the driving assembly, and a second locking ring is arranged on the outer side of the main shaft. The second locking ring cooperates with the main shaft through the pin shaft and the pin hole to limit the second spring.

[0014] As a further description of the above technical solution: the outer ring sleeve of the main shaft is provided with two bearings, and the second spring sleeve is arranged on the outer side of the main shaft and is located between the two bearings.

[0015] As a further description of the above technical solution: there is a gap between the sleeve and the first protective shell, and the first spring ring sleeve is arranged on the outside of the sleeve.

[0016] As a further description of the above technical solution: the end surface between the first protective shell and the second protective shell is set to be tooth-shaped, so that the first protective shell and the second protective shell are meshed.

[0017] As a further description of the above technical solution: a threaded groove is provided on one end face of the main shaft for installing a countersink drill, and one end of the main shaft close to the threaded groove is a stepped shaft, which cooperates with the end face of one side of the sleeve for limiting.

[0018] As a further description of the above technical solution: a gasket is provided on one side of the second protective shell.

[0019] The above technical solution has the following advantages or beneficial effects:

[0020] 1. By setting a limit assembly on the outside of the main shaft and designing one end of the main shaft as a stepped shaft, the spring and bearing on the inside of the sleeve are limited, which does not affect the reciprocating motion between the main shaft and the sleeve, while enhancing the supporting strength of the fixed depth sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the depth-fixing sleeve proposed by the utility model;

[0022] Figure 2 A physical diagram of the fixed depth sleeve proposed in the utility model;

[0023] Figure 3 It is a comparison diagram between the existing fixed depth sleeve structure and the fixed depth sleeve of the present application.

[0024] Legend:

[0025] 1. Sleeve; 2. Main shaft; 3. First protective shell; 4. Second protective shell; 5. First spring; 6. Second spring; 7. First locking ring; 8. Pin hole; 9. Pin shaft; 10. Second locking ring; 11. Bearing; 12. Threaded groove; 13. Washer; 14. Limiting shaft. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Reference Figure 1-Figure 2 The utility model provides an embodiment: a countersink limiting depth-fixing sleeve, comprising: a sleeve 1; a main shaft 2 which reciprocates along the axial direction is arranged on the inner side of the sleeve 1; a driving component is connected to one side of the main shaft 2 to drive the main shaft 2 to rotate; a limiting component is arranged on the outer ring sleeve of the main shaft 2 to limit the main shaft 2 when it moves and resets.

[0028] In this embodiment, the driving component is a pneumatic or electric drill gun, which is connected to the main shaft 2 through a chuck to drive the main shaft 2 to rotate and countersink the aircraft skin. A limiting component is arranged on the outside of the main shaft 2. In the process of pressing the main shaft down for countersinking, the distance that the main shaft 2 extends to the inside of the sleeve 1 is limited to prevent the main shaft 2 from feeding too far and damaging the aircraft skin. By arranging a limiting component on the outside of the main shaft 2 and designing one end of the main shaft 2 as a stepped rotating shaft, the limiting component on the inside of the sleeve 1 is limited, which does not affect the reciprocating motion between the main shaft 2 and the sleeve 1, while enhancing the supporting strength of the fixed depth sleeve.

[0029] A first protective shell 3 and a second protective shell 4 are provided on the outside of the sleeve 1. The second protective shell 4 is connected to the sleeve 1 by threads, and the first protective shell 3 and the second protective shell 4 are abutted against each other. The end face between the first protective shell 3 and the second protective shell 4 is set to a tooth shape so that the first protective shell 3 and the second protective shell 4 are meshed.

[0030] In this embodiment, the first protective shell 3 is firstly sleeved on the sleeve 1, and then the second protective shell 4 is connected to the sleeve 1 by threads. The depth of the sleeve 1 inserted into the inner side of the first protective shell 3 and the second protective shell 4 is adjusted by rotation to adjust the depth of the countersinking. The first protective shell 3 and the second protective shell 4 are abutted against each other, and the end faces are toothed, so that relative rotation is prevented after being connected by threads.

[0031] A through hole is provided on the first protective shell 3, a limiting shaft 14 is arranged between the first protective shell 3 and the sleeve 1, a sliding groove is provided on the sleeve 1, one side of the limiting shaft 14 is adapted to the through hole, and the other side extends into the sliding groove, so as to limit the rotation of the sleeve 1.

[0032] A first locking ring 7 is provided on one side of the first protective shell 3 , and the first locking ring 7 is connected to the sleeve 1 through threads. After being rotated and tightened, a certain force is applied to one side of the first protective shell 3 to limit and lock it with the second protective shell 4 .

[0033] The limiting assembly includes a first spring 5 and a second spring 6. A volume cavity is formed between the first protective shell 3 and the sleeve 1, so that the first spring 5 is placed inside the volume cavity.

[0034] In this embodiment, the first spring 5 is located between the first protective shell 3 and the second protective shell 4, and there is a gap between the sleeve 1 and the first protective shell 3. The first spring 5 is arranged in a ring sleeve on the outside of the sleeve 1, and one end is in contact with the limit shaft 14. When the first protective shell 3 and the second protective shell 4 are abutted, the first spring 5 is in a compressed state. When the first locking ring 7 is arranged on one side of the first protective shell 3, the spring thrust is applied to one side of the second protective shell 4 to lock the second protective shell 4. At the same time, when adjusting the countersinking depth of the sleeve 1, after rotating and loosening the first locking ring 7, the first protective shell 3 and the second protective shell 4 are separated, and the second protective shell 4 is rotated to adjust its position at the sleeve 1 to adjust the countersinking depth.

[0035] A threaded slot 12 is provided on one end face of the spindle 2 for mounting a countersink drill. One end of the spindle 2 close to the threaded slot 12 is a stepped shaft, which cooperates with one end face of the sleeve 1 for limiting, so that one end of the spindle 2 extends to the outside of the sleeve 1 for limiting.

[0036] A pin hole 8 is provided on the side of the main shaft 2 close to the driving assembly, and a second locking ring 10 is provided on the side of the main shaft 2 away from the threaded notch 12. The ring sleeve is provided on the outside of the main shaft 2, and the outside of the main shaft 2 is provided as a rectangular connecting section. The inside of the second locking ring 10 is a rectangular hole adapted to the connecting section of the main shaft 2, and the outer diameter of the second locking ring 10 is smaller than the inner diameter of the sleeve 1, so that the main shaft 2 and the second locking ring 10 can be extended into the inside of the sleeve 1, and reciprocate to countersink the aircraft skin. The second locking ring 10 and the main shaft 2 cooperate with the pin hole 8 through the pin shaft 9 to limit the second spring 6.

[0037] The outer ring sleeve of the main shaft 2 is provided with two bearings 11, and the second spring 6 is sleeved on the outer side of the main shaft 2 and is located between the two bearings 11. When rotating, the second locking ring 10 and the connecting section on the main shaft 2 limit the upper bearing, and the lower bearing is on the inner side of the sleeve and is limited by the sleeve 1. During the countersinking process, the second spring 10 is squeezed. Furthermore, a partition is provided between the second spring 10 and the bearing 11 to protect the bearing. The bearing on the side close to the drive assembly is a ball bearing, and the bearing on the side close to the threaded groove 12 is a needle bearing.

[0038] A gasket 13 is provided on one side of the second protective shell 4, which contacts the aircraft skin to prevent the aircraft skin from being damaged when pressing down during the countersinking process. The gasket is made of nylon or steel.

[0039] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A countersinking limiting depth setting sleeve, characterized in that: include: Sleeve (1); A main shaft (2) is arranged inside the sleeve (1) and reciprocates in the axial direction; One side of the main shaft (2) is connected to a driving assembly to drive the main shaft (2) to rotate; The outer ring sleeve of the main shaft (2) is provided with a limiting component for limiting the main shaft (2) when it is moved and reset; A first protective shell (3) and a second protective shell (4) are provided on the outer side of the sleeve (1); the second protective shell (4) is connected to the sleeve (1) by means of threads, and the first protective shell (3) and the second protective shell (4) are in abutment with each other; The limiting assembly comprises a first spring (5) and a second spring (6); a volume cavity is formed between the first protective shell (3) and the sleeve (1), so that the first spring (5) is placed inside the volume cavity; A pin hole (8) is arranged on a side of the main shaft (2) close to the driving assembly, and a second locking ring (10) is arranged on the outer side of the main shaft (2). The second locking ring (10) cooperates with the main shaft (2) through a pin shaft (9) and the pin hole (8) to limit the second spring (6); The outer ring sleeve of the main shaft (2) is provided with two bearings (11), and the second spring (6) is sleeved on the outer side of the main shaft (2) and is located between the two bearings (11).

2. The depth-fixing sleeve according to claim 1, characterized in that: A first locking ring (7) is provided on one side of the first protective shell (3), and the first locking ring (7) is connected to the sleeve (1) via threads.

3. The depth-fixing sleeve according to claim 1, characterized in that: There is a gap between the sleeve (1) and the first protective shell (3), and the first spring (5) is arranged in a ring sleeve on the outside of the sleeve (1).

4. The depth-fixing sleeve according to claim 1, characterized in that: The end surface between the first protective shell (3) and the second protective shell (4) is arranged in a tooth shape, so that the first protective shell (3) and the second protective shell (4) are meshed with each other.

5. The depth-fixing sleeve according to claim 1, characterized in that: A threaded slot (12) is provided on one end face of the main shaft (2) for mounting a countersink drill. One end of the main shaft (2) close to the threaded slot (12) is a stepped shaft, which cooperates with the end face of one side of the sleeve (1) for limiting position.

6. The depth-fixing sleeve according to claim 1, characterized in that: A gasket (13) is provided on one side of the second protective shell (4).

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