CN113883143B

CN113883143B - Bolt installation method of near-closed space piece

Info

Publication number: CN113883143B
Application number: CN202111197993.2A
Authority: CN
Inventors: 邢朝阳; 陈旭; 马渊; 赵兵兵; 赵晖
Original assignee: Xi'an Golden Mountain Ceramic Composites Co ltd
Current assignee: Xian Xinyao Ceramic Composite Material Co Ltd
Priority date: 2021-10-14
Filing date: 2021-10-14
Publication date: 2023-05-16
Anticipated expiration: 2041-10-14
Also published as: CN113883143A

Abstract

The invention relates to a bolt installation method, in particular to a bolt installation method of a near-closed space piece, which aims to solve the technical problem that in the prior art, an external component is difficult to install by connecting the bolt with the near-closed space piece, and provides a bolt installation method of the near-closed space piece. According to the method, at least two holes, namely a bolt through hole, are formed in the near-closed space piece and used for installing the bolt, and a nut implanting hole is formed in the near-closed space piece, the size of the hole is larger than that of the nut and used for implanting the nut, certain structural treatment is carried out on the bolt and the nut under the condition that the fastening strength of the bolt and the nut is not affected, process holes are designed in the bolt and the nut, space centering of the bolt and the nut is completed through a specific threading method, and the installation of the bolt of the near-closed space piece is completed, so that references are provided for the installation of the bolt in similar structural design.

Description

Bolt installation method of near-closed space piece

Technical Field

The invention relates to a bolt installation method, in particular to a bolt installation method of a near-closed space piece.

Background

In the design process of ceramic matrix composite product components, certain structural parts often need to be overlapped with metal structural parts to improve the strength of the product. However, the ceramic matrix composite member is difficult to be mounted on the ceramic matrix composite member in the early stage of composite forming due to the fact that the ceramic matrix composite member is subjected to high temperature of more than 1500 ℃ in the forming process, and certain parts of the ceramic matrix composite member are designed into a near-closed space according to design requirements, so that the subsequent metal member is connected with the ceramic matrix composite member through bolts and mounted to a certain degree of difficulty.

Disclosure of Invention

The invention aims to solve the technical problem that in the prior art, the connection and installation of an external component and a near-closed space piece are difficult through bolts, and provides a bolt installation method of the near-closed space piece.

In order to solve the technical problems, the technical solution provided by the invention is as follows:

the bolt installation method of the near-closed space piece is characterized by comprising the following steps of:

1) Preparation work

1.1 Selecting a nut and a bolt according to the size of the near-closed space piece;

1.2A) respectively processing a bolt through hole and a nut implantation hole on the near-closed space piece, wherein the size of the nut implantation hole is larger than that of the nut, the size of the nut is larger than that of the bolt through hole, and the size of the bolt through hole is larger than that of a stud of the bolt and smaller than that of a nut of the bolt;

1.2B) processing a first wire through hole and a second wire through hole which do not affect the strength on the nut and the bolt respectively; the first wire passing holes comprise a first wire passing hole A and a first wire passing hole B which are axial holes symmetrically arranged on two sides of the upper central axis of the nut; the second wire passing hole is an axial hole of a stud and a nut of the through bolt;

1.3 Taking a stay wire, enabling one end of the stay wire to pass through a central through hole of a nut to be left at the right end of the nut, enabling the other end of the stay wire to pass through a first wire passing hole A from the left end of the nut, bypassing the outer side wall of the nut close to the first wire passing hole A, passing through the end face of the left end of the nut and the outer side wall of the nut close to a first wire passing hole B, passing through the first wire passing hole B, and then passing through the central through hole of the nut to reach the right end of the nut, so that two ends of the stay wire meet and are knotted at a position close to the end;

2) Bolt installation

2.1 Placing the nut and the stay wire wound on the nut into the near-closed space piece through the nut implantation hole, manufacturing a hook by using an iron wire, extending the hook into the near-closed space piece through the bolt through hole by means of endoscope observation, pulling out the stay wire from the bolt through hole after hooking the stay wire by using the hook, and attaching the nut to the bolt through hole on the inner wall of the near-closed space piece by tightening the stay wire;

2.2 The stay wire on the nut is cut off from the knotting position, then the wire end is penetrated into a second wire passing hole of the bolt, the stay wire is tensioned, the bolt is meshed with the nut through the bolt passing hole through manual operation, concentric positioning is achieved, and finally the fastening of the bolt and the nut is completed through a spanner.

Further, in step 1.3), the knotting is specifically performed near the end: sequentially tying two knots near the end part to form a hook ring which can be hooked by a hook by two parallel line segments between the two knots;

in step 2.1), the pull wire is pulled out from the bolt through hole after being hooked by the hook, specifically: the hook ring at the end part of the stay wire is hooked by the hook and then pulled out from the bolt through hole.

Further, the stay wire is a fish wire.

Further, the wire diameter of the pull wire is 0.2-0.4 mm, and the bearing tension is more than or equal to 5kg.

Compared with the prior art, the invention has the following beneficial effects:

according to the bolt installation method of the near-closed space piece, at least two holes are formed in the near-closed space piece, one bolt through hole is used for installing a bolt, one nut is implanted into the hole, the size of the hole is larger than that of the nut, the nut is implanted, certain structural treatment is carried out on the bolt and the nut under the condition that the fastening strength of the bolt and the nut is not affected, namely, the technological holes are designed on the bolt and the nut, the space centering of the bolt and the nut is completed through a specific threading method, and the installation of the near-closed space piece bolt is completed.

Drawings

FIG. 1 is a schematic view of a near-confined space member of the present invention;

FIG. 2 is a schematic view of the structure of the nut of the present invention;

FIG. 3 is a side view of the nut of the present invention;

FIG. 4 is a schematic view of the structure of the bolt on the nut side in the present invention;

FIG. 5 is a cross-sectional view of a bolt of the present invention;

FIG. 6 is a schematic view of the structure of the nut after winding the pull wire;

FIG. 7 is a schematic view of the structure of the nut of the present invention after a pull wire is wound thereon and threaded into the bolt;

FIG. 8 is a schematic view of the structure of the near-enclosed space of the present invention after the bolts are installed;

FIG. 9 is a side view of a near-enclosed space member in accordance with an embodiment of the present invention;

FIG. 10 is a top view of an embodiment of the invention with a near-enclosure mounting bolt;

FIG. 11 is a schematic view of the structure of the bolt-alignment nut of the invention when the bolt is installed in the near-enclosed space;

reference numerals illustrate:

1-airtight space piece, 2-bolt via hole, 3-nut implantation hole, 4-nut, 5-first via hole, 6-bolt, 7-second via hole, 8-stay wire, 9-knot, 10-hook ring, 11-metal support, 12-ceramic matrix composite box.

Detailed Description

The invention is further described below with reference to the drawings and examples.

A method of bolt installation of a near-enclosed space, comprising the steps of:

1) Preparation work

1.1 Selecting a nut 4 and a bolt 6 with proper sizes according to the size of the near-closed space piece (selecting a proper bolt 6 and a proper nut 4 according to the size of a component);

1.2A) as shown in FIG. 1, respectively processing a bolt through hole 2 and a nut implantation hole 3 on the near-closed space piece, wherein the size of the nut implantation hole 3 is larger than that of a nut 4, the size of the nut 4 is larger than that of the bolt through hole 2, and the size of the bolt through hole 2 is larger than that of a stud of the bolt 6 and smaller than that of a nut of the bolt 6;

1.2B) processing a first wire through hole 5 and a second wire through hole 7 which do not affect the strength on the nut 4 and the bolt 6 respectively; as shown in fig. 2 and fig. 3, the first via hole 5 includes a first via hole a and a first via hole B, which are axial holes symmetrically disposed on two sides of the central axis of the nut 4; as shown in fig. 4 and 5, the second wire passing hole 7 is an axial hole of a stud and a nut of the through bolt 6;

1.3 Taking a pull wire (fish wire), wherein the wire diameter of the pull wire 8 is 0.2-0.4 mm, the bearing tension is more than or equal to 5kg, threading the nut 4 by the selected pull wire 8 in a mode shown in fig. 6, enabling one end of the pull wire 8 to pass through a central through hole of the nut 4 and be left at the right end of the nut 4, enabling the other end of the pull wire 8 to pass through a first wire through hole A from the left end of the nut 4, bypassing the outer side wall of the nut 4 close to the first wire through hole A, passing through the end face of the left end of the nut 4 and the outer side wall of the nut 4 close to the first wire through hole B, passing through the first wire through hole B, and then passing through the central through hole of the nut 4 to reach the right end of the nut 4, enabling two ends of the pull wire 8 to meet, and sequentially tying two knots 9 at positions close to the end, and enabling two parallel line segments between the two knots 9 to form a hook ring 10 capable of being hooked by a hook;

2) Bolt 6 mounting

2.1 Placing all nuts 4 together with the pull wire 8 wound on the nuts (the nuts 4 with the wire through) into the near-closed space piece through the nut implantation holes 3, manufacturing hooks by using iron wires, extending the hooks into the near-closed space piece through the bolt through holes 2, hooking the hook rings 10 on the pull wire 8 by using the hooks, pulling out the hook rings from the bolt through holes 2, and tensioning and attaching the nuts 4 to the bolt through holes 2 on the inner wall of the near-closed space piece by tensioning the pull wire 8;

2.2 As shown in fig. 7), the pull wire 8 on the nut 4 is cut off from the knotting 9, then the wire end is inserted into the second wire passing hole 7 of the bolt 6, as shown in fig. 11, the pull wire 8 is pulled tightly, the bolt 6 is meshed with the nut 4 through the bolt passing hole 2 by manual operation (the nut 4 is preliminarily connected with the bolt 6 by hand), concentric positioning is achieved, and finally the fastening of the bolt 6 and the nut 4 is completed by an internal hexagonal wrench, so that the installation of the bolt 6 in the near-closed space piece is achieved.

As shown in fig. 8 to 10, a certain box supporting frame product consists of a ceramic matrix composite box body 12, a metal bracket 11, a metal bolt 6 and a nut. After the ceramic matrix composite body 12 is molded, the metal bracket 11 is required to be mounted on the ceramic matrix composite body 12. Since the ceramic matrix composite box 12 is a near-tight space piece, and there is only one phi 15 nut implantation hole, except for 4M 6 bolt vias 2.

The method of the invention is used for installing the box body supporting frame product, and comprises the following steps:

1) Making threading holes for all bolts 6 and nuts 4 of the box body support frame product in the mode shown in fig. 2 to 5;

2) Selecting a fish wire with a proper diameter, penetrating the fish wire into the nut 4 and tying two knots 9 at the wire end as shown in fig. 6;

3) Placing the metal nut 4 and the knot 9 ring on the fishing line thereof into the ceramic matrix composite box body 12 from the phi 15 hole on the ceramic matrix composite box body 12, hooking the hook ring 10 on the fishing line by using a small metal hook through endoscope observation, and then placing the nut 4 into the ceramic matrix composite box body 12;

4) Penetrating the fishing lines on the nuts 4 into the bolt through holes 2 on the metal bracket 11, shearing the knots 9 on the fishing lines by scissors, and then penetrating the two fishing lines into the metal bolts 6 (penetrating from the small end to the big end of the bolts 6);

5) As shown in fig. 11, the fishing line is pulled by hand, the metal nut 4 is pulled onto the inner molded surface of the ceramic matrix composite box body 12, the metal bolt 6 is penetrated into the box body bolt through hole 2 to be meshed with the metal nut 4, and then the bolt 6 is screwed by a spanner;

6) The mounting of the remaining bolts 6 is accomplished in the same way.

Finally, it should be noted that: the foregoing embodiments are merely for illustrating the technical solutions of the present invention, and not for limiting the same, and it will be apparent to those skilled in the art that modifications may be made to the specific technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, without departing from the spirit of the technical solutions protected by the present invention.

Claims

1. A method of installing a bolt in a near-enclosed space, comprising the steps of:

1) Preparation work

1.1 Selecting a nut (4) and a bolt (6) according to the size of the near-closed space piece;

1.2A) respectively processing a bolt through hole (2) and a nut implantation hole (3) on the near-closed space piece, wherein the size of the nut implantation hole (3) is larger than that of the nut (4), the size of the nut (4) is larger than that of the bolt through hole (2), and the size of the bolt through hole (2) is larger than that of a stud of the bolt (6) and smaller than that of a nut of the bolt (6);

1.2B) processing a first wire through hole (5) and a second wire through hole (7) which do not affect the strength on the nut (4) and the bolt (6) respectively; the first wire passing hole (5) comprises a first wire passing hole A and a first wire passing hole B, and is an axial hole symmetrically arranged at two sides of the central axis on the nut (4); the second wire passing hole (7) is an axial hole of a stud and a nut of the through bolt (6);

1.3 Taking a stay wire (8), enabling one end of the stay wire (8) to pass through a central through hole of the nut (4) and to be left at the right end of the nut (4), enabling the other end of the stay wire (8) to pass through a first wire passing hole A from the left end of the nut (4), bypassing the outer side wall of the nut (4) close to the first wire passing hole A, passing through the left end face of the nut (4) and the outer side wall of the nut (4) close to the first wire passing hole B, passing through the first wire passing hole B, and then passing through the central through hole of the nut (4) to reach the right end of the nut (4), enabling the two ends of the stay wire (8) to meet and knotting (9) close to the end position;

2) Bolt installation

2.1 Placing the nut (4) and the stay wire (8) wound on the nut into the near-closed space piece through the nut implantation hole (3), manufacturing a hook by using iron wires, stretching the hook into the near-closed space piece through the bolt through hole (2) by means of endoscope observation, pulling out the stay wire (8) from the bolt through hole (2) after hooking the stay wire (8), and attaching the nut (4) to the bolt through hole (2) on the inner wall of the near-closed space piece by tightening the stay wire (8);

2.2 The stay wire (8) on the nut (4) is cut off from the knotting (9), then the thread end is penetrated into the second wire passing hole (7) of the bolt (6), the stay wire (8) is tensioned, the bolt (6) is meshed with the nut (4) through the bolt passing hole (2) through manual operation, concentric positioning is achieved, finally the fastening of the bolt (6) and the nut (4) is completed through a spanner, and the installation of the bolt (6) close to the airtight space piece is completed.

2. The method of installing a bolt for a near-enclosed space according to claim 1, wherein:

in step 1.3), the knot (9) at the position close to the end is specifically: sequentially tying two knots (9) near the end part to form a hook ring (10) which can be hooked by a hook by two parallel line segments between the two knots (9);

in the step 2.1), the pull wire (8) is pulled out from the bolt through hole (2) after being hooked by the hook, specifically: the hook ring (10) at the end part of the stay wire (8) is hooked by the hook and then pulled out from the bolt through hole (2).

3. The method for installing a bolt for a near-airtight space according to claim 1 or 2, wherein,

the stay wire (8) is a fish wire.

4. A method of installing a bolt for a near-tight space according to claim 3, wherein,

the diameter of the stay wire (8) is 0.2-0.4 mm, and the bearing tension is more than or equal to 5kg.