KR102047995B1 - Hole masking apparatus - Google Patents

Abstract

Disclosed is a hole masking apparatus used for masking a hole of an object in a leak test. The hole masking apparatus comprises: a shaft in which a first body is formed in the shape of a column, and a second body is formed in the shape of a column having the same central axis as the first body with a larger diameter than that of the first body in a dead end at an upper portion in a direction of the hole of the first body; and an elastic masking unit having a larger diameter than the second body, wherein a hollow corresponding to the shape of the second body is formed therein, having a lower portion that is opened, and enabling a dead end of the lower portion to protrude to an internal side to surround an upper surface, a side surface, and a lower surface of the second body to be coupled to the second body.

Description

Hall masking apparatus

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hole masking device, and more particularly, to a hole masking device capable of easily engaging or exchanging a masking part with a shaft in a one-touch manner and masking a hole without causing deformation of the masking part.

Leak test refers to a test that measures the tightness of an entire system, oil or lubrication system after processing of various objects. For example, after the machining of the various parts of the vehicle, such as the transmission case, the transmission housing, the engine block, the engine head, the water pump, the valve body, and the like, the open holes of the object are all masked and then moved into the interior. The leak test may be performed by injecting gas or fluid to determine whether there is a leak.

In order to perform the leak test, the masking device was moved to mask all the open holes of the object, and then the leak test was performed. The masking device is divided into a shaft that is moved using a cylinder and a masking part that is coupled to one end of the shaft to mask an open hole of an object. In the related art, in the coupling of the masking part to the shaft, the masking device is connected to the shaft using a bolt in the center of the masking part. Fixing or fixing the masking part itself to the shaft structure was used. However, when fixing the masking portion to the shaft using the bolt fastening method as described above, there is a risk of breakage due to wear of the bolts and threads during frequent replacement, and there is a problem that the masking portion is not in close contact with the shaft, causing leakage. In addition, when masking an object by using a masking device using a conventional fastening method, the hardness of the masking part of the elastic material is low, so that the bolt is further protruded, causing damage to the object, and leak test using high pressure air. When the residual pressure is generated inside the masking portion there was a problem that the masking portion is separated from the shaft.

The problem to be solved by the present invention is to provide a hole masking device that can be easily coupled or exchanged to the shaft in a one-touch manner, and can mask holes without causing deformation of the masking portion.

Hole masking device used to mask the hole (hole) of the object in the leak test (leak test) according to an embodiment of the present invention for achieving the above object, the first body of the columnar shape is formed, the first It has a larger diameter than the shaft and the shaft and the second body is formed in the upper end of the hole in the direction of the hole has a diameter larger than the first body and a columnar second body having the same central axis as the first body, A hollow corresponding to the shape of the second body is formed, and the lower part is open and the lower end is protruded inward, and is coupled to the second body while surrounding the upper, side, and lower surfaces of the second body. An elastic masking part may be provided.

The shaft further includes a third body having a diameter larger than that of the first body and having the same central axis as the first body and being spaced apart from the lower surface of the second body and coupled to the first body. A portion protruding inwardly of the masking part may be inserted into and coupled to a seating groove that is a spaced space between the second body and the third body.

The masking part may be coupled to an upper surface of the second body to be in contact with the object with a thickness of 0.5 mm to 4 mm.

The shaft has an air hole, which is a space in which air moves, to an upper surface of the second body, and the masking part corresponds to the air hole of the upper surface of the second body to transfer the air to the object. The through hole may be formed at the position.

Hole masking apparatus according to an embodiment of the present invention has the advantage that the masking unit can be easily coupled or exchanged to the shaft in a one-touch manner without the need to fasten using bolts or to form a thread in the masking unit. . In addition, the hole masking apparatus according to an embodiment of the present invention according to the present invention can prevent the damage of the object by the bolt or the distortion of the masking portion as the bolt is not necessary, the area where the masking portion is in contact with the object is leak In performing the test, the shape of the masking unit does not change, and thus, there is an advantage that stable masking is possible. In addition, the hole masking apparatus according to the embodiment of the present invention can thin the masking portion in contact with the object to a thickness of 4 mm or less, so that the masking part is separated from the shaft even when performing a leak test using high pressure air. It has the advantage of solving the problem and excellent adhesion with the material. In addition, the hole masking device according to an embodiment of the present invention, the shape of the shaft portion to which the masking portion and the masking portion are coupled is simple and can be manufactured through simple processing, thereby reducing the manufacturing cost of the masking portion and the shaft. There is an advantage that can significantly reduce the production cost of the masking device.

BRIEF DESCRIPTION OF THE DRAWINGS In order to better understand the drawings cited in the detailed description of the invention, a brief description of each drawing is provided.
1 is a perspective view of a hole masking apparatus according to an embodiment of the inventive concept.
FIG. 2 is a cross-sectional view of a shaft and a masking part separated from the hole masking device of FIG. 1.
3 is a cross-sectional view of a masking unit coupled to a shaft in the hole masking apparatus of FIG. 1.
4 is a cross-sectional view of a shaft and a masking part separated from the hole masking apparatus according to another embodiment of the present invention.
5 is a cross-sectional view of a masking unit coupled to a shaft in the hole masking apparatus of FIG. 4.

DETAILED DESCRIPTION In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

1 is a perspective view of a hole masking apparatus 100 according to an embodiment of the present invention, and FIG. 2 is a shaft 110 and a masking unit 120 separated from the hole masking apparatus 100 of FIG. 1. 3 is a cross-sectional view of the masking unit 120 coupled to the shaft 110 in the hole masking device 100 of FIG. 1.

1 to 3, the hole masking apparatus 100 used to mask a hole of an object in a leak test may include a shaft 110 and a masking unit 120.

The shaft 100 may include a first body 111 and a second body 113. The first body 111 may have a columnar shape. In FIG. 1, the first body 111 may have a cylindrical shape, but the first body 111 may have a cross-sectional shape as well as various other shapes. Hereinafter, for convenience of description, it is assumed that the hole direction of the object masked by the hole masking device 100 is the upper direction of the hole masking device 100. The second body 113 may be formed at the upper end of the hole direction of the object to be masked among the first body 111. If the hole masking device 100 assumes the hole direction of the object to be masked as the downward direction of the hole masking device 100, the second body 113 is the hole direction of the object to be masked among the first bodies 111. It will be formed at the lower end of the. In addition, the second body 113 may have a columnar shape having a diameter larger than that of the first body 111 and having the same central axis as the first body 111. Similarly to the first body 111, the second body 113 is illustrated in a cylindrical shape in FIG. 1, and the second body 113 may have a cross-sectional shape as well as various other shapes.

The masking part 120 may have an elastic material and have a larger diameter than the second body 113, and a hollow corresponding to the shape of the second body 113 may be formed therein. Since the second body 113 may be coupled to the hollow formed in the masking part 120, the hollow formed in the masking part 120 may surround the outside of the second body 113. It can have For example, as shown in FIG. 1, when the second body 113 has a cylindrical shape, the hollow formed in the masking part 120 may have the second body 113 as shown in FIGS. 2 and 3. It may have a cylindrical shape to be coupled to surround the and may have a size corresponding to the size of the second body (113). In addition, the masking part 120 may have a lower end while the lower end thereof protrudes inwardly (in the direction of the central axis of the masking part 120) to surround the top, side, and bottom surfaces of the second body 113. 2 may be coupled to the body 113. That is, the hollow part formed inside the masking part 120 is coupled to surround the upper surface and the side of the second body 113, and the part protruding from the lower end of the masking part 120 is the second body 113. It may be coupled to surround the lower surface of the). As described above, the masking part 120 has a column shape in which the inside is empty and only the lower part is opened, and the lower end has a shape protruding inwardly, so that the masking part 120 can be manufactured through simple processing, and has a elastic material, thus providing a simple one-touch method. It can be coupled to or separated from the shaft 110.

In addition, in order for the masking part 120 to be coupled to the shaft 110 more stably, the shaft 110 may further include a third body 115 and a seating groove 117. The third body 115 has a diameter larger than that of the first body 111 and has the same central axis as the first body 111 and is spaced apart from the lower surface of the second body 113 to be coupled on the first body 111. Can be. That is, the third body 115 may be coupled to the first body 111 spaced apart from the second body 113 in the lower direction of the second body 113. A spaced portion between the second body 113 and the third body 115 may be a seating groove 117, and a part of the seating groove 117 protruding inward to the lower end of the masking part 120. This can be inserted and combined. That is, the seating groove 117 may have a size that can be coupled to the protruding portion inward to the lower end of the masking portion 120. Portions protruding inward to the lower end of the masking portion 120 may be coupled to the seating groove 117 by pressing fit. As such, since the third body 115 is formed on the shaft 110, the masking unit 120 may be more firmly and stably coupled to the shaft 110. The first body 111, the second body 113 and the third body 115 described above may be a shaft 110 by integrally formed by processing a single material, by combining the respective processing separately It may also be a shaft 110.

The masking part 120 may be coupled to the upper surface of the second body 113 to have a thickness of 0.5 mm to 4 mm in contact with the object. That is, when the part of the masking part 120 which is coupled to the upper surface of the second body 113 and contacts the object exceeds 4 mm, the hardness is increased and the elastic force of the masking part 120 is weakened so that the masking part 120 is in close contact with the object. The force may be weak and the leak test may not be performed normally. In addition, when the part of the masking part 120 that is coupled to the upper surface of the second body 113 and is in contact with the object is less than 0.5 mm, the masking part 120 is difficult to function as the masking part 120 of the elastic material. There is a problem that there is no difference from the case that is not combined. Therefore, the thickness of the portion of the masking portion 120 of the present invention coupled to the upper surface of the second body 113 to contact the object is between 0.5 mm and 4 mm.

4 is a cross-sectional view of the shaft 110 and the masking unit 120 separated from the hole masking device 110 ′ according to another embodiment of the present invention, and FIG. 5 is the hole masking device 100 ′ of FIG. 4. ) Is a cross-sectional view of the masking unit 120 is coupled to the shaft 110.

1 to 5, the hole masking device 100 ′ according to the embodiment of FIGS. 4 and 5 has a space for injecting air into the hole masking device 100 of FIGS. 1 to 3. It differs in that it is the same, and the remaining shapes and configurations are the same.

That is, in the hole masking apparatus 100 ′, the shaft 110 may have a space in which air moves to the inside of the shaft 110 to the upper surface of the second body 113. For example, as illustrated in FIGS. 4 and 5, the air hole 119 may be formed to penetrate all of the first body 111, the second body 113, and the third body 115. Only some of these may be formed. However, since air must be delivered to the object through the inner space of the hole masking apparatus 100 ′, an air hole 119 is formed on the upper surface of the second body 113 to extend, and the air is the second body. It is transmitted to the outside of the upper surface of the 113. In addition, the masking part 120 may have a through hole H formed at a position corresponding to the air hole so as to transfer the air to the object. That is, the masking part 120 may be formed with a through hole H for transferring the air to the object at a position corresponding to the position of the air hole 119 formed on the upper surface of the second body 113. The through hole H may have the same or smaller size as the air hole 119 formed on the upper surface of the second body 113. As such, the structure of the shaft 110 and the masking part 120 except for the air hole 119 and the through hole H is the same as that of the shaft 110 and the masking part 120 described with reference to FIGS. 1 to 3. In the following description, the descriptions will be replaced with those described with reference to FIGS. 1 to 3.

As described above, optimal embodiments have been disclosed in the drawings and the specification. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (4)

In the hole masking device used to mask the hole of the object in the leak test,
A shaft having a first body having a columnar shape, and a shaft having a second body having a diameter larger than that of the first body and having the same central axis as the first body, is formed at an upper end of the first body in the hole direction. ; And
It has a larger diameter than the second body, there is formed a hollow corresponding to the shape of the second body therein, the bottom is open and the lower end is protruded inward, the upper surface, side and It is provided with a masking portion of an elastic material surrounding the lower surface and coupled to the second body,
The shaft,
And a third body having a diameter larger than that of the first body and having the same central axis as the first body, being spaced apart from the lower surface of the second body and coupled to the first body.
A portion protruding inwardly of the masking part is inserted into and coupled to a seating groove, which is a spaced space between the second body and the third body,
The masking unit,
The thickness of the portion coupled to the upper surface of the second body in contact with the object is between 0.5 mm and 4 mm,
The shaft,
An air hole, which is a space in which air moves, is formed up to an upper surface of the second body.
The masking unit,
And a through hole formed at a position corresponding to the air hole in an upper surface of the second body to transfer the air to the object. delete delete delete

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