Plugging pin structure for mounting blind hole insert and using method of plugging pin structure

Abstract

The invention relates to a plugging pin structure for mounting a blind hole insert and a using method of the plugging pin structure, and belongs to the technical field of composite material manufacturing. The invention discloses a plugging pin structure for mounting a blind hole insert and a use method of the plugging pin structure. The plugging pin structure comprises a variable-diameter plug, an outer screw sleeve and an inner screw rod, the variable-diameter plug comprises a left plug and a right plug which are the same in structure, the left plug and the right plug are connected into a whole through a connecting piece, and a threaded hole A is formed by center shafts of the variable-diameter plug after connection; the outer thread sleeve is used for blocking the small-diameter part of the through hole of the blind hole insert, and a threaded hole B allowing the inner screw to be screwed in is formed along the central axis of the outer thread sleeve; the outer threaded sleeve and the variable-diameter plug are installed in the through hole of the blind hole insert, the inner threaded rod is sequentially screwed into the threaded hole B and the threaded hole A to plug the large-diameter part of the through hole of the blind hole insert, and the plugging pin structure is taken down after the pouring sealant is completely cured. The method has the following advantages: a good processing effect is achieved; and the quality of the mounted blind hole insert is ensured to meet the design requirement.

Description

TECHNICAL FIELD

[0001] The application relates to a blind hole inlay installation plugging pin structure and a use method thereof, and belongs to the technical field of composite material manufacturing. BACKGROUND

[0002] A composite material honeycomb sandwich plate is composed of a fiber plate and a honeycomb core, and the two are assembled by adhesive film bonding. The composite material part with the honeycomb sandwich structure has the characteristics of light weight, high stiffness, strong bending resistance and good corrosion resistance, and is widely used in the field of aerospace. Floors on various large and medium-sized passenger planes and transport planes also adopt the sandwich plate with the structure.

[0003] According to design requirements, the floor is processed by using the composite material honeycomb sandwich plate, mainly including processing an outer shape, drilling holes, removing the honeycomb core, periphery sealing, and inlay installation. The installation quality of the inlay is crucial, which not only plays a role in connecting the floor and the floor beam and other structural parts, but also undertakes the task of transmitting and bearing loads. SUMMARY

[0004] The application aims to provide a blind hole inlay installation plugging pin structure for completing the installation of the blind hole inlay on the honeycomb sandwich plate, so as to ensure that the quality of the installed blind hole inlay meets the design requirements.

[0005] In order to achieve the above-mentioned purpose, the application adopts the following technical scheme: a blind hole inlay installation plugging pin structure, the plugging pin structure comprises a variable-diameter plug, an outer screw sleeve and an inner screw rod; the variable-diameter plug comprises a left plug and a right plug which are the same in structure and are connected into one body through a connecting piece, and the central axis of the variable-diameter plug forms a threaded hole A after connection; the outer screw sleeve is used for plugging a small-diameter part of a through hole of the blind hole inlay, and a threaded hole B for rotating the inner screw rod is formed along the central axis of the outer screw sleeve; the outer screw sleeve and the variable-diameter plug are installed into the through hole of the blind hole inlay, the inner screw rod is rotated into the threaded hole B and the threaded hole A in sequence, the diameter of the variable-diameter plug is increased, a large-diameter part of the through hole of the blind hole inlay is plugged, and the plugging pin structure is removed after the sealing glue is completely cured.

[0006] Preferably, a connecting hole for penetrating the connecting piece is formed on the left plug and the right plug, the connecting hole comprises a connecting hole A with an opening end on the upper and lower surfaces of the left plug and the right plug, and a connecting hole B with an opening end on the opposite surfaces of the left plug and the right plug, the number of the connecting hole B is multiple, and the connecting hole A is in communication with the connecting hole B.

[0007] Preferably, an arc-shaped groove is arranged on the opposite surfaces of the left plug and the right plug, and the upper and lower openings of the arc-shaped groove are located on the upper and lower surfaces of the left plug and the right plug respectively; and the opening end of the connecting hole B is located in the arc-shaped groove.

[0008] Preferably, the connecting piece is a connecting steel wire A, and two ends of the connecting steel wire A are located at opening ends of the connecting holes of the left plug and the right plug respectively.

[0009] Further, the connecting holes C are provided in plurality and are uniformly distributed in the axial direction of the variable-diameter plug and the outer sleeve, and are in communication with each other.

[0010] Preferably, the inner screw rod comprises an inner screw rod head and a threaded segment, and an end surface of the threaded segment is flush with a bottom end of the variable-diameter plug after the threaded segment is screwed into the threaded hole of the variable-diameter plug.

[0011] Preferably, an outer diameter of the variable-diameter plug before being screwed into the inner screw rod is consistent with an outer diameter of the threaded segment of the outer sleeve.

[0012] Another object of the present application is to provide a use method of the blind-hole insert installation plugging pin structure, comprising the following steps, (1) a mounting hole of the blind-hole insert is made on the honeycomb sandwich panel according to a design requirement of a hole diameter size and a position; (2) the outer sleeve and the variable-diameter plug are installed into a through hole of the blind-hole insert, and the inner screw rod is screwed into a threaded hole of the outer sleeve and the variable-diameter plug, so that the variable-diameter plug is enlarged in diameter to plug a part of the through hole of the blind-hole insert with a large diameter; (3) a filling adhesive is injected into the mounting hole of the blind-hole insert, the blind-hole insert after the through hole is plugged is inserted into the blind-hole insert mounting hole into which the filling adhesive is injected, and the filling adhesive overflowing from a gap between an overflow hole of the blind-hole insert and the blind-hole insert and the mounting hole of the honeycomb sandwich panel is removed; (4) after the filling adhesive is gelled, the inner screw rod is unscrewed to be withdrawn from the variable-diameter plug, and the plugging pin structure is removed after the filling adhesive is completely solidified.

[0013] Working principle: a mounting hole of the blind-hole insert is made on the honeycomb sandwich panel in need of installation of the insert, a hole diameter and a hole depth meet tolerance requirements of an installation hole diameter and a hole depth of the insert, debris, dust and loose core material generated in the hole making process are removed, and then the through hole of the insert is plugged by using the variable-diameter plugging pin structure, so that the adhesive for filling the insert does not flow into the through hole of the insert during installation of the insert, the through hole of the insert is not plugged, subsequent connection and other installation functions of the insert are realized, and installation quality of the insert is ensured to meet design requirements.

[0014] Compared with the prior art, the present application has the following advantages: good processing effect is achieved, and installation quality of the blind-hole insert after installation meets design requirements. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a variable-diameter plug structure schematic diagram in the embodiment of the present application. Figure 2 is the outer sleeve structure schematic diagram in the embodiment of the present application; Figure 3 is the inner screw structure schematic diagram in the embodiment of the present application; Figure 4 is the steel wire upper end fixed plug structure schematic diagram in the embodiment of the present application; Figure 5 is the steel wire lower end fixed plug structure schematic diagram in the embodiment of the present application; Figure 6 is the connecting steel wire structure schematic diagram in the embodiment of the present application (wherein, 6a is the connecting steel wire B structure schematic diagram; 6b is the connecting steel wire A structure schematic diagram); Figure 7 is the blind hole insert structure schematic diagram in the embodiment of the present application (wherein, 7a is the axonometric view; 7b is the front view; 7c is the top view); Figure 8 is the blind hole insert installation schematic diagram on the honeycomb sandwich panel in the embodiment of the present application; Figure 9 is the blind hole insert schematic diagram after the glue joint of the potting glue on the honeycomb sandwich panel in the embodiment of the present application; Figure 1 in which, 1 is the connecting hole C; 2 is the connecting hole A; 3 is the connecting hole C; 4 is the connecting hole A; 5 is the connecting hole B; 6 is the threaded hole A; Figure 2 in which, 7 is the connecting hole C; 8 is the threaded hole B; Figure 3 in which, 10 is the inner screw head; 11 is the inner screw threaded segment; Figure 4 in which, 12 is the one-letter slot; 13 is the steel wire upper end fixed plug; 14 is the threaded hole C; Figure 5 in which, 15 is the steel wire lower end fixed plug; 16 is the threaded hole C; Figure 6 in which, 17 is the connecting steel wire B; 18 is the connecting steel wire A; Figure 7 in which, 19 is the blind hole insert; 20 is the blind hole insert through hole; 21 is the blind hole insert through hole; 22, 23 are the blind hole insert overflow holes; Figure 8 in which, 19 is the blind hole insert; 24, 25 are the fiber plates; 26, 27 are the glue films; 28 is the honeycomb core; Figure 9 in which, 29 is the potting glue. DETAILED DESCRIPTION

[0016] The following will be combined with the accompanying drawings Figures 1-9Further details of the present application: a blind hole insert installation plugging pin structure, which mainly includes a variable diameter plug (consisting of left and right, as shown in Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 4 , 5 According to the diameter and height of the through hole of the blind hole insert (as shown in Figure 7 ) installed in the honeycomb sandwich panel, the threaded part diameter d1 = 4.8 mm, the height h1 = 4.7 mm, the unthreaded part diameter d2 = 6.4 mm, the height h2 = 3.1 mm, the outer sleeve diameter of the plugging pin is designed to be 4.8 mm and the height is 4.7 mm, the variable diameter plug diameter is 4.8 mm and the height is 3.1 mm, and the inner screw rod diameter is 1.6 mm and the height is 7.8 mm.

[0017] In this embodiment, as shown in Figure 1 , the variable diameter plug includes left and right plugs with the same structure, which are connected into one body by a connecting piece. After connection, the central axis of the variable diameter plug forms a threaded hole A6. A connecting hole C3 is formed along the axis of the left plug, and a connecting hole C1 is formed along the axis of the right plug. The number of the two connecting holes is multiple and is distributed around the threaded hole A6. In this embodiment, the connecting piece is a connecting wire A18, as shown in Figure 6 . As a preferred embodiment of this embodiment, connecting holes are formed on the left plug and the right plug for the connecting wire A18 to pass through. The connecting holes include connecting holes A4 with open ends on the upper and lower surfaces of the left plug and the right plug, connecting holes A2, and connecting holes B5 with open ends on the opposite surfaces of the left plug and the right plug. The number of connecting holes B5 is multiple, and connecting holes A2 and connecting holes B5 are in communication. To reduce the influence of the left plug and the right plug on the outer diameter of the variable diameter plug during connection, arc-shaped grooves are provided on the opposite surfaces of the left plug and the right plug. The upper and lower openings of the arc-shaped grooves are located on the upper and lower surfaces of the left plug and the right plug, respectively. The open ends of the connecting holes B5 are located in the arc-shaped grooves, and the two ends of the connecting wire A18 are located at the open ends of the connecting holes of the left plug and the right plug, respectively.

[0018] As shown in Figure 2 , the outer sleeve is used to plug the small diameter part of the through hole 20 of the blind hole insert (as shown in Figure 7 ). It includes an outer sleeve head and an outer sleeve threaded segment. Connecting holes C7 and threaded holes B8 are formed along the axis of the outer sleeve. The open ends of the connecting holes C7 are located on the upper surface of the outer sleeve head and the lower surface of the outer sleeve threaded segment, respectively. The number of connecting holes C7 is consistent with that of connecting holes C1 and connecting holes C3, and the positions are opposite. The threaded hole B8 is located on the central axis of the outer sleeve, and the position is opposite to that of the threaded hole A6.

[0019] In this embodiment, the connecting steel wire B17 (as shown in Figure 6 is inserted into the connecting hole C7 and the connecting hole C3, the connecting hole C7 and the connecting hole C1 in sequence, and then the left plug and the outer sleeve and the right plug and the outer sleeve are connected together.

[0020] As shown in Figure 3 , the inner screw rod includes an inner screw rod head 10 and an inner screw rod threaded segment 11. After the inner screw rod threaded segment 11 is screwed into the variable-diameter plug threaded hole A6, the lower end surface is flush with the bottom end surface of the variable-diameter plug. In addition, the outer diameter of the variable-diameter plug before being screwed into the inner screw rod is consistent with the outer diameter of the outer sleeve threaded segment. When the outer sleeve and the variable-diameter plug are installed into the through hole of the blind hole insert 19, the inner screw rod is screwed into the threaded hole B8 and the threaded hole A6 in sequence, so that the diameter of the variable-diameter plug is increased, and the part with a large diameter of the blind hole insert through hole 21 (as shown in Figure 7 ) is plugged.

[0021] As shown in Figure 4 , 5 , in this embodiment, the two ends of the connecting steel wire B17 are provided with external threads, and the two ends of the connecting steel wire B17 are plugged by the upper end fixed plug 13 and the lower end fixed plug 15. In order to facilitate operation, a slot 12 is arranged on the upper surface of the upper end fixed plug 13, and a threaded hole C14 is arranged on the lower surface of the upper end fixed plug 13. The threaded hole C14 is a blind hole, and the axial direction is consistent with the central axis of the upper end fixed plug 13. A threaded hole C14 is arranged on the lower surface of the lower end fixed plug 15, and a threaded hole C16 is arranged on the lower surface of the lower end fixed plug 15. The threaded hole C16 is a blind hole, and the axial direction is consistent with the central axis of the lower end fixed plug 15.

[0022] As shown in Figure 7 , the blind hole insert 19 includes a blind hole insert through hole and blind hole insert overflow holes 22 and 23. The blind hole insert through hole is a stepped hole arranged along the axial direction of the blind hole insert 19. The part with a small diameter (the blind hole insert through hole 20) is located at the upper part of the stepped hole and is provided with an internal thread matched with the outer sleeve threaded segment. The part with a large diameter (the blind hole insert through hole 21) is located at the lower part of the stepped hole and has no internal thread. The blind hole insert overflow holes 22 and 23 are arranged oppositely.

[0023] The left plug and the right plug of the variable-diameter plug are first connected together by connecting steel wire A. The connecting steel wire A needs to be inserted from one half of the connecting hole, pass through the hole diameter, and then be inserted into the other half of the connecting hole, and also pass through the hole diameter. In this way, the connecting steel wire A is inserted and passed through the left plug and the right plug to connect them. The last passing needs to fall on the half that is not the first insertion. Then the variable-diameter plug is connected with the external sleeve by connecting steel wire B. Both ends of all the connecting steel wire B need to be fixed by steel wire fixed plug. The upper end of the steel wire with a slot 12 is fixed by the plug 13 installed on the upper end, and the lower end of the steel wire without a slot is fixed by the plug 15 installed on the lower end. The change of the diameter of the variable-diameter plug is realized by the internal screw rod. It is required that the internal screw rod can be well matched with the non-threaded part of the through hole of the blind hole insert after entering the variable-diameter plug, so as to ensure that the through hole of the blind hole insert is not blocked by the potting glue after installation, realize the connection and other installation functions, and meet the design installation requirements.

[0024] A method for using the plugging pin structure for installing the blind hole insert, comprising the following steps, (1) According to the design requirements of the hole diameter size and position, the installation hole of the blind hole insert is made on the honeycomb sandwich plate (including the honeycomb core 28, the fiber plate 24 adhered to the upper surface of the honeycomb core 28 by the adhesive film 26, and the fiber plate 25 adhered to the lower surface of the honeycomb core 28 by the adhesive film 27); (2) As shown in Figure 8 , the external sleeve and the variable-diameter plug are installed into the through hole of the blind hole insert 19, and the internal screw rod is screwed into the threaded hole of the external sleeve and the variable-diameter plug, so that the diameter of the variable-diameter plug is increased to plug the part of the through hole of the blind hole insert 19 with a large diameter. The internal screw rod is screwed to be flush with the end face of the variable-diameter plug, so as to prevent the internal screw rod from protruding too much or too little from the end face of the variable-diameter plug, causing insufficient potting glue under the blind hole insert or overflow of the potting glue into the through hole; (3) The potting glue 29 is injected into the installation hole of the blind hole insert 19, and the blind hole insert after plugging the through hole is inserted into the installation hole of the blind hole insert into which the potting glue is injected. The potting glue overflowing from the glue overflow hole of the blind hole insert and the gap between the blind hole insert and the installation hole of the honeycomb sandwich plate is removed; (4) After the potting glue 29 is gelled, the internal screw rod is unscrewed to withdraw from the variable-diameter plug part, so that the internal screw rod and the end face of the variable-diameter plug are separated from the potting glue. After the potting glue is completely cured, the plugging pin structure is removed to prevent excess material from entering the through hole of the blind hole insert and being stuck with the potting glue, so as to complete the installation of the blind hole insert with a large inner diameter and a small outer diameter, and the blind hole insert with glue for potting is shown in Figure 9 .

Claims

1. A blind hole inlay installation plug pin structure, characterized by: The plugging pin structure comprises a variable-diameter plug, an outer sleeve, and an inner screw rod; the variable-diameter plug comprises a left plug and a right plug which are identical in structure and are connected into one body through a connecting piece, and the central axis of the variable-diameter plug forms a threaded hole A after connection; the outer sleeve is used for plugging the part with small diameter of the through hole of the blind hole insert, and a threaded hole B for screwing in the inner screw rod is formed along the central axis of the outer sleeve; the outer sleeve and the variable-diameter plug are installed into the through hole of the blind hole insert, and the inner screw rod is screwed into the threaded hole B and the threaded hole A in sequence, so that the diameter of the variable-diameter plug is increased, the part with large diameter of the through hole of the blind hole insert is plugged, and the plugging pin structure is removed after the complete solidification of the pouring sealant.

2. The blind via inlay installation plug pin structure of claim 1, wherein: Connecting holes are formed on the left plug and the right plug for the connecting piece to pass through, and the connecting holes comprise connecting hole A with the opening end located on the upper and lower surfaces of the left plug and the right plug and connecting hole B with the opening end located on the opposite surfaces of the left plug and the right plug, and the number of the connecting hole B is multiple, and the connecting hole A is in communication with the connecting hole B.

3. The blind via inlay installation plug pin structure of claim 2, wherein: Arc-shaped grooves are arranged on the opposite surfaces of the left plug and the right plug, and the upper and lower openings of the arc-shaped grooves are located on the upper and lower surfaces of the left plug and the right plug respectively; and the opening end of the connecting hole B is located in the arc-shaped groove.

4. The blind hole inlay mounting plug pin structure according to claim 1 or 2, characterized by: The connecting piece is connecting steel wire A, and the two ends of the connecting steel wire A are located at the opening ends of the connecting holes of the left plug and the right plug respectively.

5. The blind via inlay installation plug pin structure of claim 1, wherein: It also comprises connecting hole C and connecting steel wire B, the number of the connecting hole C is multiple, and the connecting hole C is uniformly distributed in the axial direction of the variable-diameter plug and the outer sleeve cap and is in communication with the upper and lower surfaces; the connecting steel wire B passes through the connecting hole C to connect the outer sleeve cap and the variable-diameter plug.

6. The blind via inlay installation plug pin structure of claim 1, wherein: The inner screw rod comprises an inner screw rod head and a threaded segment, and the end surface of the threaded segment is flush with the bottom end of the variable-diameter plug after being screwed into the threaded hole of the variable-diameter plug.

7. The blind via inlay installation plug pin structure of claim 1, wherein: The outer diameter of the variable-diameter plug before being screwed into the inner screw rod is consistent with the outer diameter of the threaded segment of the outer sleeve.

8. A method of using a sealing pin structure for installing a blind hole insert, characterized in that: The method comprises the following steps, (1) the mounting hole of the blind hole insert is made on the honeycomb sandwich panel according to the hole diameter size and position required by the design; (2) the outer sleeve and the variable-diameter plug are installed into the through hole of the blind hole insert, and the inner screw rod is screwed into the threaded holes of the outer sleeve and the variable-diameter plug, so that the diameter of the variable-diameter plug is increased, and the part with large diameter of the through hole of the blind hole insert is plugged; (3) the pouring sealant is injected into the mounting hole of the blind hole insert, the blind hole insert after plugging the through hole is inserted into the mounting hole of the blind hole insert into which the pouring sealant is injected, and the pouring sealant overflowing from the gap between the overflow hole of the blind hole insert and the mounting hole of the blind hole insert and the honeycomb sandwich panel is removed; (4) after the pouring sealant is gelled, the inner screw rod is unscrewed to make it exit from the variable-diameter plug part; and the plugging pin structure is removed after the complete solidification of the pouring sealant.

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