KR102640014B1 - Assembling structure of separate shaft and mandrel - Google Patents

Abstract

The present invention relates to a combination of a separate shaft and a mandrel. More specifically, since it has a structure in which the first and second shafts are coupled only to the first and second boss parts, lightness and assembly efficiency can be greatly improved, and a protective ring is provided. Damage can be minimized when combining the boss and shaft by applying it, and ease and precision of assembly can be secured through the keyway and shoulder bolt fastening method on the protection ring and the first and second shafts, and structurally, it is less prone to sagging compared to the long axis. It relates to a combination of a separate shaft and a mandrel that has excellent physical properties, can reduce principal stress, and has the effect of improving workability and economic efficiency by simplifying separate tools and assembly/disassembly devices for assembly/disassembly of the long shaft.

Description

Assembling structure of separate shaft and mandrel}

The present invention relates to a combination of a separate shaft and a mandrel. More specifically, since it has a structure in which the first and second shafts are coupled only to the first and second boss parts, lightness and assembly efficiency can be greatly improved, and a protective ring is provided. Damage can be minimized when combining the boss and shaft by applying it, and ease and precision of assembly can be secured through the keyway and shoulder bolt fastening method on the protection ring and the first and second shafts, and structurally, it is less prone to sagging compared to the long axis. It relates to a combination of a separate shaft and a mandrel that has excellent physical properties, can reduce principal stress, and has the effect of improving workability and economic efficiency by simplifying separate tools and assembly/disassembly devices for assembly/disassembly of the long shaft.

In general, filament winding technology is a method of manufacturing a molded product in which a receiving space is formed inside by winding a fiber material with heat-hardening performance along the outer peripheral surface of a mold and then heating it.

However, when manufacturing large molded products, heat-curing using hot air applied from the outside requires insulation in a very large space, resulting in extremely low efficiency, which causes a problem in that the process efficiency is greatly reduced.

In addition, when manufacturing a pressure vessel (tank) with a gradually decreasing diameter at both ends using filament winding technology, manufacturing difficulties arise because it is not easy to dismantle the mold after curing due to the structure of the molded product. there was.

Therefore, when manufacturing a pressure vessel (tank) with a gradually decreasing diameter at both ends using the filament winding technique, a method that can easily dismantle the mold and maximize preheating (heating) efficiency has been proposed. It is necessary.

In this regard, looking at the prior art, 'filament winding molding device and filament winding molding method using the device' is disclosed in Korean Patent No. 10-0629959, but this has the problem of not solving the difficulties raised above. there was.

Conventional technologies to solve this problem include, as shown in FIG. 6, disclosed in Korean Patent No. 10-2226423, a body portion having a cylindrical shape with a rotation axis parallel to the ground and having hemispherical ends at both ends; a first shaft portion provided with one end insertable from one end of the body portion in an inward direction; a second shaft portion having one end insertable in an inward direction from the other end of the body portion and the other end being coupled to one end of the first shaft; comprising: the body portion, the first shaft portion; The shaft portion and the second shaft portion form a circulation path that communicates with each other to facilitate circulation of hot air flowing into the interior, and the body portion includes a first section provided in the shape of a cylinder with a rotation axis parallel to the ground; a second section section formed in a hemispherical shape at one end of the first section section and a first insertion hole into which the first shaft section can be inserted; A second insertion hole is provided in a hemispherical shape at the other end of the first section and into which the second shaft portion can be inserted; a third section is formed, and the first to third sections are capable of being coupled and released. A mold with high preheating efficiency is disclosed, which is characterized in that it is easily prepared.

However, in the case of the above registered patent, the hot air supplied through the shaft is not directly supplied to the outer surface of the body in contact with the molded product but is transmitted via the hot air supply unit, so not only is there a problem of reduced thermal efficiency, but also the shaft is significantly connected to the mold or mandrel. Since it is inserted a lot and has a structure in which hot air is transmitted from the center of the mandrel to the outside, it has a long axis structure that is practically like inserting one shaft, and has an internal structure to transmit hot air to the inside to ensure lightness. It is difficult, and the assembly structure also has complex problems.

Republic of Korea Patent No. 10-2226423 Republic of Korea Patent No. 10-0629959

The present invention was created to solve the problems of the prior art. The purpose of the present invention is to have a structure in which the first and second separate shafts are coupled only to the first and second boss parts, so that lightness and assembly efficiency can be greatly improved. Damage can be minimized when combining the boss and shaft by applying a protective ring, and ease and precision of assembly can be secured through the keyway and shoulder bolt fastening method on the protective ring and the first and second shafts. Compared to the long shaft, it has superior properties against deflection and can reduce principal stress. In terms of connection, it provides a combination of a separate shaft and mandrel that can simplify the assembly/disassembly of a separate tool and assembly/disassembly device for assembling/disassembling the metal shaft of the long shaft. It is done.

The problems to be solved by the present invention are not limited to those mentioned above, and other problems not mentioned can be clearly understood by those skilled in the art from the description below.

In order to achieve the above object, the combination of a separate shaft and a mandrel according to the present invention includes a cylinder portion, a pair of first and second dome portions disposed on the left and right sides of the cylinder portion, and a pair coupled to the first and second dome portions. a detachable mandrel comprising first and second boss parts, wherein the cylinder part and the first and second dome parts each have a structure in which a plurality of segments are assembled; a detachable first shaft detachably coupled to the first boss; and a detachable second shaft detachably coupled to the second boss portion, wherein the first and second detachable shafts are not connected but are separated from each other, thereby improving assembly efficiency and enabling a lightweight design. Do it as

In addition, in the combination of a separable shaft and a mandrel according to the present invention, a protective ring is provided between the first boss portion and the separable first shaft and between the second boss portion and the separable second shaft.

In addition, in the combination of a separable shaft and a mandrel according to the present invention, a flange portion is formed at one end of the separable first shaft and the second shaft, respectively, and is coupled to the first dome portion and the second dome portion, respectively,

The protective ring is composed of a cylindrical portion inserted into the first boss portion or the second boss portion, and a disk portion that extends along the circumferential direction of the cylindrical portion and is coupled to the flange portion. In the state where it is inserted into the first boss part or the second boss part, the separable first shaft or the separable second shaft is inserted into the cylindrical part of the protection ring, and then connected to the first boss part or the second boss part using a fastening member. , It is characterized by integrally combining the protective ring and the flange portion.

In addition, in the combination of a separate shaft and a mandrel according to the present invention, a plurality of segments constituting the cylinder portion and the first and second dome portions are composed of a structure in which an outer casing and an inner casing are combined, and adjacent outer casings are each The partition formed at the end is coupled through a fastening member while in contact with each other, and the inner casing is coupled to the partition through a fastening member.

In addition, in the combination of a separate shaft and a mandrel according to the present invention, an outer flow path is formed between the outer casing and the inner casing, and the outer flow path is partitioned by the partition portion and communicates through a ventilation hole formed in each partition portion. It is characterized by being

In addition, in the combination of a separate shaft and a mandrel according to the present invention, the coupling part in which the first and second boss parts, the protective ring, and the flange parts of the first and second shafts are integrally combined increases resistance to bending and straightness of assembly. It is coupled with a shoulder bolt to secure, and the protection ring and the first and second shafts are coupled in such a way that a key is inserted into the key groove formed on each, thereby increasing ease and precision of assembly. Do it as

According to the present invention, the separable shaft and mandrel coupling structure has a structure in which the separable first and second shafts are coupled only to the first and second boss parts, so lightness and assembly efficiency can be greatly improved, and a protective ring is applied to connect the boss and the mandrel. Damage can be minimized when combining shafts, and ease and precision of assembly can be secured through the keyway and shoulder bolt fastening method on the protective ring and the separate 1st and 2nd shafts, and structurally, the physical properties against deflection compared to the long axis This is excellent and can reduce principal stress, and in terms of coupling, separate tools and assembly/disassembly devices for assembling/disassembling the long-axis metal shaft are simplified, which has the effect of improving workability and economic efficiency.

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description below.

1 is a plan view showing the structure of a mandrel according to the present invention.
FIG. 2 is an exploded perspective view showing the boss portion of the mandrel, the protective ring, and the first shaft in FIG. 1 being combined.
Figure 3 is an enlarged cross-sectional view showing the boss portion, the protective ring, and the first shaft of the mandrel of the present invention combined.
Figure 4 is an enlarged cross-sectional view showing the boss portion of the mandrel of the present invention, the protective ring, and the second shaft combined.
Figure 5 is a perspective view showing the coupling relationship between the outer casing and the inner casing of the mandrel of the present invention.
Figure 6 is a diagram showing conventional registered patent No. 10-0629959.

Hereinafter, preferred embodiments of the present invention will be described in detail.

In describing the present invention, if a detailed description of a related known function or configuration is judged to unnecessarily obscure the gist of the present invention, the detailed description will be omitted. In addition, the terms described below are terms defined in consideration of functions in the present invention, and may vary depending on the intention of the user or operator or precedents. Therefore, the definition should be made based on the contents throughout this specification.

Among the terms used in the present invention, composite materials include organic/inorganic fibers such as glass fiber, carbon fiber, and aramid fiber, and prepreg manufactured by impregnating the fiber with resin.

Among the terms used in the present invention, 'rubber' refers to natural rubber as well as heat-resistant rubber such as SBR, NBR, EPDM, etc., and rubber to which carbon fiber, aramid fiber, and silica fiber are added as fillers or vulcanized to improve heat resistance and insulation performance. Includes. Rubber refers to rubber in an unvulcanized state and includes only a portion of the surface that has been vulcanized due to preform work.

Figure 1 is a plan view showing the structure of a mandrel according to the present invention, Figure 2 is an exploded perspective view showing the boss portion of the mandrel, the protective ring, and the first shaft in Figure 1 combined, and Figure 3 is a view showing the structure of the mandrel according to the present invention. It is an enlarged cross-sectional view showing the boss part of the mandrel, the protective ring, and the first shaft combined, and Figure 4 is an enlarged cross-sectional view showing the boss part of the mandrel of the present invention, the protective ring, and the second shaft combined, Figure 5 is a perspective view showing the coupling relationship between the outer casing and the inner casing of the mandrel of the present invention.

Referring to Figures 1 to 5, the mandrel according to the present invention serves as a mold to support a rubber strip and a composite material, such as a pressure vessel or pipe, during molding, and largely consists of a cylinder portion 110a and the cylinder portion. It includes a pair of first and second dome parts 110b disposed on the left and right of (110a), and a pair of first and second boss parts 110c coupled to the first and second dome parts 110b, Among them, the cylinder portion 110a and the first and second dome portions 110b are a detachable mandrel 110 composed of a plurality of assembled segments, and a detachable first shaft detachably coupled to the first boss portion 110c. It includes (150a) and a detachable second shaft (150b) that is detachably coupled to the second boss portion (110c).

Here, the pressure vessel can be used not only for pressure vessels used in private industry, but also for pressure vessels used in the military industry such as combustion pipes for missiles and aircraft, and fuel tanks.

The separate mandrel 110 of the present invention may be made of a metal material with high thermal conductivity, such as aluminum, but is not limited thereto.

A protection ring is provided between the first boss part 110c and the first separable shaft 150a and between the second boss part 110c and the second separable shaft 150b to protect the shaft and firmly couple it to each other. 170) is published.

That is, the separable first shaft and the separable second shaft are not directly coupled to the first boss portion and the second boss portion, but are coupled through a protective ring disposed between them.

The separable first shaft 150a is inserted into the first boss portion 110c and may have a hollow tube structure to supply high-temperature, high-pressure fluid to the outer flow path of the main body 110.

A flange portion 155 coupled to the first boss portion 110c is formed at one end of the separable first shaft 150a, and the second boss portion ( A flange portion 155 coupled to 110c) is formed.

The protective ring 170 includes a cylindrical portion 171 inserted into the first boss portion or the second boss portion 110c, extends along the circumferential direction of the cylindrical portion 171, and includes the flange portion 155. It consists of a disk portion 172 that is coupled to and in contact with.

With the protection ring 170 inserted into the first boss part or the second boss part 110c, the separable first shaft 150a or the separable second shaft 150b is inserted into the cylinder of the protection ring 170. After inserting it into the part 171, the first boss part 110c or the second boss part 110c, the protection ring 170, and the flange part 155 are integrated into one using a fastening member such as a solder bolt. Combine.

Here, the first and second boss parts, the protective ring, and the flange parts of the first and second shafts are integrally coupled through solder bolts, thereby increasing resistance to bending and ensuring straightness of assembly. There is an advantage.

In this way, since the separate first shaft and second shaft (150a, 150b) are inserted into the first boss portion and the second boss portion through the protection ring, damage due to direct contact between the shaft and the protection portion can be prevented, and more A strong and precise connection can be achieved.

In addition, an outer keyway (151a) is formed on the outer peripheral surface of the separate first and second shafts (150a, 150b), and an inner keyway (173a) is formed on the inner peripheral surface of the cylindrical portion of the protective ring, and the outer keyway and the inner key groove are placed at a position where they come into contact with each other, and a key 173 is inserted.

In this way, when the separate first and second shafts 150a and 150b are respectively coupled to the protection ring 170, the coupling position is guided by the key 173 inserted into the outer and inner keyways 151a and 173a. The process of assembling the shaft to the mandrel becomes easier, and assembly precision can be secured.

Meanwhile, in the present invention, the first shaft and the second shaft are separated from each other rather than connected to each other, rather than a shaft having a single long axis structure, so there is an advantage in that assembly is improved and a lightweight design is possible.

In particular, since the separable first and second shafts are fixed while being inserted only into the first and second boss portions provided at the left and right ends of the mandrel, the assembly time can be greatly reduced compared to the process of assembling a long axis shaft. The total weight of the shaft can be reduced by at least 20%, and the power required for mandrel rotation can be reduced due to the reduction in shaft weight.

In addition, it was experimentally confirmed that the combination of a separate shaft and a mandrel of the present invention reduces dead weight deflection compared to a combination using a long shaft penetrating the mandrel.

Table 1 below shows the results of simulating the self-weight deflection and principal stress/yield strength according to the type of shaft coupled to the mandrel. Cases 1 and 2 employ a long-axis shaft penetrating the mandrel, and Case 3 is a combination of the present invention and Likewise, separate first and second shafts were adopted.

Case Weight [Ton] Self-weight deflection
[mm] Principal stress/yield strength shaft mandrel One 5.013 20.631 4.002 82.4MPa/220MPa 2 5.013 18.445 3.733 72.9MPa/220MPa 3 3.981 17.414 3.522 69.9MPa/220MPa

Looking at the self-weight deflection with reference to Table 1 above, it was confirmed that the self-weight deflection of Case 3 was 3.522mm, which was reduced compared to 4.002 and 3.733mm of Cases 1 and 2.

Looking at the principal stress/yield strength, it was confirmed that the principal stress/yield strength of Case 3 was 69.9MPa/220MPa, which was decreased compared to 84.4MPa/220MPa in Case 1 and 72.9MPa/220MPa in Case 2.

At one end of the detachable first shaft (150a), a plurality of units are formed along the circumferential direction so that the fluid supplied through the detachable first shaft (150a) is supplied to the outer flow path when inserted into the first boss portion (110c). A supply hole 151 is formed.

At one end of the second separable shaft (150b), a plurality of grooves are formed along the circumferential direction so that the fluid passing through the outer flow path is discharged into the inside of the second separable shaft (150b) when inserted into the second boss portion (110c). A discharge hole 152 is formed.

The fluid supplied through the first separable shaft 150a moves through an outer flow path provided between the outer casing and the inner casing and is then discharged to the outside through the second separable shaft.

The separate mandrel of the present invention includes the cylinder portion 110a and the first and second dome portions 110b, respectively, an outer casing 120, an inner casing 130, and the outer casing 120 and the inner casing 130. It is configured to include an outer flow path 127 provided therebetween, and a partition 125 bent at an end of the outer casing 120 to partition the outer flow path between the outer casing and the inner casing.

The inner casing 130 is provided with an opening 131 at one end or the other end and has a sealed structure to prevent fluid from flowing into the inner space, at a position corresponding to the first dome part or the second dome part 110b. It can be exemplified that the sealing cover 133 is installed in a detachable manner. A ventilation hole 125a is formed in the partition 125 to allow fluid to pass through.

The present invention described above is merely illustrative, and those skilled in the art will appreciate that various modifications and other equivalent embodiments are possible therefrom. Therefore, it will be understood that the present invention is not limited to the forms mentioned in the detailed description above. Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the attached patent claims. In addition, the present invention should be understood to include all modifications, equivalents and substitutes within the spirit and scope of the present invention as defined by the appended claims.

110: Separate mandrel
110a: cylinder part 110b: first and second dome parts
110c: first and second boss parts 120: external casing
123: heat dissipation coating layer 125: compartment
125a: Ventilation hole 127: Outer flow path
130: inner casing 131: opening
132: Insulating coating layer 133: Sealed cover
135: O-ring for sealing 150a, 150b: 1st, 2nd shaft
151: supply hole 151a: outer keyway
152: discharge hole 155: flange part
170: protective ring 171: cylindrical part
172: disc portion 173: key
173a: inner keyway

Claims (6)

It includes a cylinder part, a pair of first and second dome parts disposed on the left and right sides of the cylinder part, and a pair of first and second boss parts coupled to the first and second dome parts, and the cylinder part and the first and second dome parts. The dome portion includes a separate mandrel composed of a plurality of assembled segments;
a detachable first shaft detachably coupled to the first boss;
It includes a detachable second shaft detachably coupled to the second boss part,
Since the first and second separate shafts are not connected but have a separate structure, assembly is improved and a lightweight design is possible,
A protective ring is provided between the first boss portion and the first separable shaft and between the second boss portion and the second separable shaft,
Flange portions coupled to the first dome portion and the second dome portion, respectively, are formed at one end of the separable first shaft and the second shaft,
The protective ring is composed of a cylindrical part inserted into the first boss part or the second boss part, and a disk part extending along the circumferential direction of the cylindrical part and abutting and coupled to the flange part,
With the protective ring inserted into the first boss part or the second boss part, the separable first shaft or the separable second shaft is inserted into the cylindrical part of the protective ring, and then the first boss part is connected using a fastening member. Or a combination of a separate shaft and a mandrel, characterized in that the second boss portion, the protective ring, and the flange portion are integrally combined.
delete delete According to paragraph 1,
A plurality of segments constituting the cylinder portion and the first and second dome portions have a structure in which an outer casing and an inner casing are combined,
Neighboring external casings are joined through fastening members with partitions formed at each end in contact,
A combination of a separable shaft and a mandrel, characterized in that the inner casing is coupled to the partition through a fastening member.
According to paragraph 4,
An outer flow path is formed between the outer casing and the inner casing,
A separate shaft and mandrel combination, characterized in that the outer flow path is divided by the partition portion and communicates through a ventilation hole formed in each partition portion.
According to paragraph 1,
The coupling portion in which the first and second boss portions, the protective ring, and the flange portions of the first and second shafts are integrally combined is coupled with a shoulder bolt to increase resistance to bending and ensure straightness of assembly,
A separate shaft and mandrel combination, characterized in that the protection ring and the first and second shafts are coupled by inserting a key into a key groove formed on each, thereby increasing ease and precision of assembly.