JP2005337906A - Leakage inspection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein a facility for a leakage inspection device gets large as the whole and gets expensive, since a driving means such as a hydraulic jack and a hydraulic cylinder is provided in each of masking units provided corresponding to respective faces of an inspected object in a conventional leakage inspection device. <P>SOLUTION: In this leakage inspection device provided with the plurality of masking units 2, 3 for closing respectively opening parts 11 of the respective faces 1a, 1b, 1c in the inspected object 10 having the opening parts 11 of the plurality of faces 1a, 1b, 1c, a lower cylinder 5 for advancing and retracting the masking units 2, 3, and a driving force transmitting means for transmitting driving force of the lower cylinder 5 to the side face masking units 3, the driving force transmitting means is a link mechanism 7 for changing a driving direction for the lower cylinder 5 to be transmitted to the the side face masking units 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a leak inspection apparatus for detecting a leak defect generated in an inspection object such as a cylinder block of an engine that requires confidentiality.

2. Description of the Related Art Conventionally, a leak inspection apparatus for detecting a leak defect generated in an inspection object such as a cylinder block of an engine that requires confidentiality is known.
In such a leak inspection apparatus, for example, as shown in Patent Document 1, a masking unit for closing a perforation formed in an inspection object such as an oil hole or a water hole formed in a cylinder block is provided. It has been.
This masking unit is provided corresponding to each surface of the object to be inspected, and each masking unit is provided with a driving means so that it can advance and retreat in the direction to open and close the perforations formed on each surface. Has been.
JP 2002-328066 A

In the above-described leakage inspection apparatus, each of the masking units provided corresponding to each surface of the object to be inspected is provided with driving means such as a hydraulic jack and a hydraulic cylinder, so a large number of these driving means are required. In addition, a large capacity hydraulic pump unit is required.
As a result, there has been a problem that the equipment of the leak inspection apparatus is increased in size and cost as a whole.
Therefore, the present invention provides a leak inspection apparatus that is reduced in size and cost while ensuring the reliability of the inspection.

A leak inspection apparatus that solves the above problems has the following characteristics.
That is, as described in claim 1, in an inspection object having openings on a plurality of surfaces, a plurality of masking units for respectively closing the openings on each surface, driving means for moving the masking units forward and backward, A leakage test apparatus comprising a driving force transmitting means for transmitting the driving force of the driving means to the masking unit, wherein the driving force transmitting means changes the driving direction of the driving means and transmits it to the masking unit. It is.
Accordingly, the masking unit is advanced and retracted in a direction different from the driving direction of the driving means by the operation of the driving means, and the opening of the surface of the object to be inspected arranged in a direction different from the driving direction of the driving means is closed. It becomes possible.
Therefore, the number of cylinders for moving the masking unit back and forth can be reduced, and the leak test apparatus can be reduced in size and cost.

According to a second aspect of the present invention, a plurality of the driving force transmission means are provided, and a plurality of masking units are advanced and retracted in different directions via the driving force transmission means by the operation of one driving device.
As a result, it is possible to simultaneously close the openings on multiple surfaces of the object to be inspected by operating only one driving means, and the number of cylinders that advance and retract each masking unit can be reduced. It is possible to reduce the size and cost of the apparatus.

According to a third aspect of the present invention, the masking unit has a first masking unit for closing the opening and at least one opening on the first surface having at least one opening. A second masking unit for closing the opening with respect to a second surface arranged in a direction different from the one surface, and the first masking unit is configured to open the opening of the first surface by the driving means. The second masking unit is driven by the drive means via the driving force transmission means in conjunction with the advance / retreat operation of the first masking unit. Are driven forward and backward to open and close the opening of the second surface.
Thereby, only by operating one driving means, the first masking unit is advanced and retracted in the driving direction of the driving means, and the driving direction of the driving means is changed by the cam mechanism, so that the first masking unit The second masking unit can be advanced and retracted in a direction different from the advance / retreat direction, and the opening on the first surface and the opening on the second surface can be closed simultaneously.
Therefore, the number of cylinders for moving the masking unit back and forth can be reduced, and the leak test apparatus can be reduced in size and cost.

According to a fourth aspect of the present invention, the inspected object is provided with a plurality of second surfaces arranged in different directions, and the leak test apparatus has a second surface corresponding to each second surface. A masking unit and a driving force transmission means are provided, respectively, and the plurality of second masking units are respectively associated with the corresponding second through the driving force transmission means in conjunction with the movement of the first masking unit by the driving means. It is driven back and forth in a direction to open and close the opening of the surface.
Thereby, all the opening parts of a 1st surface opening part and several 2nd surface can be obstruct | occluded simultaneously only by operating one drive means.
As a result, the number of cylinders for advancing and retracting each masking unit can be reduced, and the leak test apparatus can be reduced in size and cost.

Further, as described in claim 5, the first surface is the bottom surface of the object to be inspected, and the object to be inspected is placed on the first masking unit with the first surface facing the first surface, The first masking unit is movable in the vertical direction by the driving means.
Thereby, the drive means can lower the first masking unit by using the weight of the object to be inspected and the first masking unit.
Therefore, the drive means can be reduced in size, and the leak test apparatus can be reduced in size and cost.

According to a sixth aspect of the present invention, the driving force transmitting means is connected to one end portion of the second masking unit, and an opening portion of the second surface is provided near the other end portion of the second masking unit. A guide member is provided for pressing the second masking unit in the closing direction.
Thereby, the second masking unit can be brought into close contact with the surface of the object to be inspected with a uniform pressing force as a whole, and the opening can be reliably closed.

According to the present invention, the number of cylinders for advancing and retracting each masking unit can be reduced, and the leak test apparatus can be reduced in size and cost.
In addition, the masking unit can be brought into close contact with the surface of the inspection object with a uniform pressing force as a whole, and the opening can be reliably closed.

  Next, modes for carrying out the present invention will be described with reference to the accompanying drawings.

[First embodiment]
As shown in FIG. 1, an inspection object 1 to be subjected to a leak test by a leak test apparatus 10 is formed in, for example, a hexahedron, and includes one or more openings 11 on a plurality of surfaces. In the case of the inspection object shown in FIG. 1, openings 11 are formed on the bottom surface 1a, the side surfaces 1b, and the top surface 1c, respectively. When the inspection object 1 is, for example, a cylinder block of an engine, the openings 11 formed in the surfaces 1a, 1b, and 1c are holes used as oil holes, water holes, and the like.

The leak test apparatus 10 is for closing a bottom masking unit 2 which is a first masking unit for closing the opening 11 formed on the bottom surface 1a of the object to be inspected 1 and an opening 11 on each side surface 1b. A side masking unit 3 as a second masking unit and a top masking unit 4 as a third masking unit for closing the opening 11 of the top surface 1c are provided. The side masking units 3 are provided in a number corresponding to the number of the side surfaces 1b on which the openings 11 are formed.
In the case of this example, the bottom surface 1a of the inspection object 1 is the first surface, the side surface 1b is the second surface, and the top surface is the third surface.

The bottom surface masking unit 2 is configured by attaching a masking member 21 for closing the opening 11 to the upper surface of the support plate 22. On the bottom face masking unit 2, the inspection object 1 is placed with the bottom face 1 a facing the masking member 21.
In a state where the inspection object 1 is placed on the bottom surface masking unit 2, the opening 11 formed in the bottom surface 1 a is in close contact with the masking member 21 due to the weight of the inspection object 1 and is blocked by the masking member 21. ing.
The masking member 21 is disposed at the position, size, and number corresponding to the position, size, and number of the openings 11 formed on the bottom surface 1a, but can be provided over the entire surface of the bottom surface 1a. The masking member 21 is made of an elastic member such as rubber.

The bottom masking unit 2 is installed on the installation surface 9 by a lower cylinder 5 which is a driving means for the bottom masking unit 2.
In the lower cylinder 5, the cylinder portion 51 is connected to the bottom surface masking unit 2 side, and the piston portion 52 is connected to the installation surface 9 side. Can be moved up and down. The lower cylinder 5 is configured as an air cylinder in this example, but a hydraulic cylinder or the like may be used.

In the vicinity of each side surface 1b of the object 1 to be inspected, side surface masking units 3 are disposed at a predetermined distance from each other. In the case of this example, side masking units 3 are arranged at four locations corresponding to the left and right side surfaces 1b in FIG. 1 and the front and back side surfaces 1b (not shown).
The side masking unit 3 is configured by attaching a masking member 31 for closing the opening 11 to the inner side surface (surface on the inspection object 1 side) of the support plate 32. The masking member 31 is made of an elastic member such as rubber.
A guide pin 32a protrudes from the side of the support plate 32, and the guide pin 32a is inserted into the guide rail 8 supported by the support base 8a. The guide rails 8 are arranged at an inner height and an outer height, and when the side masking unit 3 is raised, the side masking unit 3 is guided inward, and when it is lowered, it is guided outside.

Below each side masking unit 3, cams 71 that are rotatable around a fulcrum 72 are provided. The cam 71 is disposed in such a posture that its one end 71 a faces inward and downward and the other end 71 b faces outward and upward, and the other end 71 b is rotatably connected to the lower end of the support plate 32. ing.
Further, the lower end of the push rod 23 extending downward from the support plate 11 of the bottom surface masking unit 2 is positioned in the vicinity of the upper end of the one end 71 a of the cam 71.
The push rod 23 and the cam 71 constitute a link mechanism 7 as a driving force transmission unit that changes the driving direction of the lower cylinder 5 that is a driving unit of the bottom surface masking unit 2.

In the vicinity of the upper surface 1c of the inspection object 1, the upper surface masking unit 4 is disposed at a predetermined interval. The upper surface masking unit 4 is configured by attaching a masking member 41 for closing the opening 11 to the lower surface of the support plate 42. The masking member 41 is made of an elastic member such as rubber.
Above the upper surface masking unit 4, an upper cylinder 6 that is a driving means for the upper surface masking unit 4 is disposed. The upper cylinder 6 includes a cylinder portion 61 and a piston 62 that can expand and contract with respect to the cylinder portion 61.
The piston 62 of the upper cylinder 6 is connected to the support plate 42 of the upper surface masking unit 4, and the upper surface masking unit 4 is supported by the upper cylinder 6 so as to be movable up and down. That is, the upper cylinder 6 serves as a driving means for the upper surface masking unit 4. The upper cylinder 6 is an air cylinder in this example, but a hydraulic cylinder or the like can also be used.

  The leak test apparatus 10 in the state shown in FIG. 1 described above is in a state where the side surface 1b of the inspection object 1 and the openings 11, 11. .. Can be closed by operating 10 in the following manner.

That is, by discharging air from the first cylinder chamber 51a in the lower cylinder 5 and press-fitting air into the second cylinder chamber 51b from the state in which the piston 52 of the lower cylinder 5 shown in FIG. On the other hand, the piston 52 is reduced, and the bottom masking unit 2 is lowered.
Then, as shown in FIG. 2, the lower end of the push rod 23 comes into contact with one end 71a of the cam 71, the one end 71a is pushed downward, and the other end 71b rotates upward.

When the other end 71b of the cam 71 rotates upward, the side masking unit 3 connected to the other end 71b is pushed upward. As the side masking unit 3 rises, the side masking unit 3 moves along the guide rail 8. Move inward.
The side masking unit 3 that moves inward contacts the side surface 1 b of the inspection object 1, and the opening 11 on the side surface 1 b is closed by the masking member 31 of the side masking unit 3.

In this case, even after the side surface masking unit 3 abuts against the side surface 1b, the bottom surface masking unit 2 is moved down to such an extent that the side surface masking unit 3 is further pushed inward. Can be sealed.
Further, since the push rods 23 are provided corresponding to the cams 71, the side masking units 3 arranged at the four positions simultaneously move to close the openings 11 of the side surfaces 1b. .

In this way, the bottom masking unit 2 is placed on the bottom masking unit 2, and the bottom masking unit 2 that closes the opening 11 of the bottom surface 1 a that is the first surface of the test object 1 is lowered by the lower cylinder 5. Thus, it is possible to simultaneously close the openings 11 of the plurality of side surfaces 1b as the second surface of the inspection object 1 by the side surface masking unit 3.
That is, by operating the lower cylinder 5, it is possible to change the driving direction of the lower cylinder 5 by each cam mechanism 7 and to advance and retract the side masking unit 3 in a direction different from the driving direction of the lower cylinder 5. Therefore, the opening of the side surface 1b arranged in a direction different from the driving direction of the lower cylinder 5 can be closed.
In particular, since the side masking unit 3 and the link mechanism 7 are provided corresponding to each side 1b, all the openings 11 on the four sides 1b are simultaneously closed by operating only one lower cylinder 5. can do.
As a result, the number of cylinders for advancing and retracting each masking unit can be reduced, and the leak test apparatus 10 can be reduced in size and cost.

Further, when the bottom masking unit 2 is lowered by operating the lower cylinder 5, since the weight of the object 1 and the bottom masking unit 2 is applied to the cylinder portion 51 of the lower cylinder 5, the first cylinder chamber 51a. It is possible to close the opening 11 on the side surface 1b by lowering the bottom masking unit 2 simply by removing the air inside (without pressing the air into the second cylinder chamber 51b).
In this case, when the pressing force for closing the opening 11 of the side surface 1b is insufficient only by the weights of the object to be inspected 1 and the bottom surface masking unit 2, the lower cylinder 5 is compensated for the insufficient pressing force. What is necessary is just to press-fit air into the second cylinder chamber 51b.

Thus, by placing the bottom masking unit 2 below the inspection object 1 and placing the inspection object 1 on the bottom masking unit 2, the weight of the inspection object 1 and the bottom masking unit 2 is reduced. Utilizing this, the bottom masking unit 2 can be lowered.
As a result, it is not necessary to increase the pressure of the air press-fitted into the second cylinder chamber 51b of the lower cylinder 5 so that the lower cylinder 5 can be downsized as a small capacity cylinder, and the leak test apparatus 10 can be downsized. It is also possible to reduce costs.

  Further, the opening 11 on the upper surface 1c of the inspection object 1 discharges air from the first cylinder chamber 61a in the upper cylinder 6 from the state in which the piston 62 of the upper cylinder 6 shown in FIG. By press-fitting air into the chamber 61b, as shown in FIG. 2, the piston 62 is extended with respect to the cylinder portion 61 to lower the upper surface masking unit 4, and the masking member 41 of the upper surface masking unit 4 is moved to the upper surface 1c. Close and close.

Thus, when the upper cylinder 6 is operated and the upper surface masking unit 4 is lowered, the piston 62 of the upper cylinder 6 is loaded with the weight of the upper surface masking unit 4, so the air in the first cylinder chamber 61a is removed. Only (without pressing the air into the second cylinder chamber 61b), the upper surface masking unit 4 can be lowered to close the opening 11 of the upper surface 1c.
In this case, when the pressing force for closing the opening 11 of the upper surface 1c is insufficient only by the weight of the upper surface masking unit 4, the second cylinder chamber 61b of the upper cylinder 6 is compensated for the insufficient pressing force. Just pressurize the air.

  When the upper surface masking unit 4 is lowered to close the opening 11 of the upper surface 1c, the downward force applied to the inspection object 1 from the upper surface masking unit 4 causes the bottom surface 1a of the inspection object 1 and the bottom surface masking unit 2 to The degree of close contact with the masking member 21 is increased, and the opening 11 of the bottom surface 1a can be more reliably closed.

The upper surface masking unit 4 is provided with a pressing guide 43, and the inner side surface of the pressing guide 43 is formed as an inclined surface 43a that goes upward as it goes from the outside to the inside. An inclined surface 32b is formed on the outer surface at the upper end of the support plate 32 of the upper surface masking unit 4 so as to move upward from the outside toward the inside.
The holding guide 43 is arranged in accordance with the position of the inclined surface 32 b of the support plate 32. When the upper surface masking unit 4 is lowered, the inclined surface 43 a of the holding guide 43 comes into contact with the inclined surface 32 b of the support plate 32. Then, the upper end of the support plate 32 is pressed inward.

The side masking unit 3 has a lower end supported in a cantilever manner by a cam 71 and a guide pin 32a guided by the guide rail 8 is formed at the lower portion, so that the pressing force on the side 1b at the upper end is weak. It tends to be.
However, by pressing the upper end portion toward the side surface 1b with the pressing guide 43, the upper end portion of the side surface masking unit 3 can be pressed toward the side surface 1b similarly to the lower end portion. The opening can be reliably closed by bringing the masking member 31 into close contact with the side surface 1b with a uniform pressing force.

  In the leakage test apparatus 10, the lower cylinder 5 and the upper cylinder 6 are operated as described above to close the openings 11 of the surfaces 1 a, 1 b, and 1 c of the inspection object 1, and then the inside of the inspection object 1 Compressed gas is sealed in, and leakage of the sealed compressed gas is detected by a leak tester disposed at an appropriate location of the leak test apparatus 10.

[Second Embodiment]
Next, a second embodiment of the leak test apparatus will be described.
A leak test apparatus 100 shown in FIG. 3 includes a bottom masking unit 102 for closing the opening 11 formed on the bottom 1a of the object 1 and a side masking unit for closing the opening 11 of each side 1b. 103, an upper surface masking unit 104 for closing the opening 11 of the upper surface 1c is provided. The side masking units 103 are provided in a number corresponding to the number of the side surfaces 1b on which the openings 11 are formed.
In this example, the upper surface masking unit 104 is a first masking unit, the side masking unit 103 is a second masking unit, and the bottom masking unit 102 is a third masking unit.
Further, the upper surface of the inspection object 1 is the third surface bottom surface, the side surface 1b is the second surface, and the bottom surface 1a is the first surface.

The bottom surface masking unit 102 is configured by attaching a masking member 121 for closing the opening 11 to the upper surface of the support plate 122. On the bottom face masking unit 102, the inspection object 1 is placed in a posture in which the bottom face 1a faces the masking member 121. In a state where the inspection object 1 is placed on the bottom surface masking unit 102, the opening 11 formed on the bottom surface 1 a is in close contact with the masking member 121 due to the weight of the inspection object 1 and is blocked by the masking member 121. ing.
The masking member 121 is disposed at the position, size, and number corresponding to the position, size, and number of the openings 11 formed in the bottom surface 1a, but may be provided over the entire surface of the bottom surface 1a. The masking member 121 is made of an elastic member such as rubber.
The bottom masking unit 12 is installed on the installation surface 9 by the installation table 105.

In the vicinity of each side surface 1b of the object 1 to be inspected, side surface masking units 103 are arranged at predetermined intervals. In the case of this example, side masking units 103 are arranged at four locations corresponding to the left and right side surfaces 1b in FIG. 3 and the front and back side surfaces 1b (not shown).
The side masking unit 103 is configured by attaching a masking member 131 for closing the opening 11 to the inner side surface (surface on the inspection object 1 side) of the support plate 132. The masking member 131 is made of an elastic member such as rubber.
A guide pin 132a protrudes from the side of the support plate 132, and the guide pin 132a is inserted into the guide rail 108 supported by the support base 108a. The guide rails 108 are arranged at an inner height, an outer height, and a lower height so that the side masking unit 103 is guided inward when the side masking unit 103 is raised, and is guided outside when the side masking unit 103 is lowered.

Above each side masking unit 103, cams 171 that are rotatable around a fulcrum 172 are provided. The cam 171 is arranged in such a posture that its one end 171a faces outward and upward and the other end 171b faces inward and downward, and the other end 171b is rotatably connected to the upper end of the support plate 132. ing.
Further, a lower end of a push rod 143 extending downward from an upper surface masking unit 104 described later is located in the vicinity of the upper portion of the one end portion 171a of the cam 171.
The push rod 143 and the cam 171 constitute a link mechanism 107 as a driving force transmission unit that changes a driving direction of the upper cylinder 106 that is a driving unit of the upper surface masking unit 104.

In the vicinity of the upper surface 1c of the inspection object 1, an upper surface masking unit 104 is disposed at a predetermined interval. The upper surface masking unit 104 is configured by attaching a masking member 141 for closing the opening 11 to the lower surface of the support plate 142. The masking member 141 is made of an elastic member such as rubber.
Above the upper surface masking unit 104, an upper cylinder 106 as a driving means for the upper surface masking unit 104 is disposed. The upper cylinder 106 includes a cylinder portion 161 and a piston 162 that can be expanded and contracted with respect to the cylinder portion 161.
The piston 162 of the upper cylinder 106 is connected to the support plate 142 of the upper surface masking unit 104, and the upper surface masking unit 104 is supported by the upper cylinder 106 so as to be movable up and down. That is, the upper cylinder 106 is a driving means for the upper surface masking unit 104. The upper cylinder 106 is configured as an air cylinder in this example, but a hydraulic cylinder or the like may be used.

  The leak test apparatus 100 in the state shown in FIG. 3 described above is in a state where the side surfaces 1b and the openings 11, 11... Of the upper surface 1c are not closed. It is possible to close the openings 11, 11... On each surface of the inspection object 1 by operating 100 as follows.

That is, by discharging air from the first cylinder chamber 161a in the upper cylinder 106 and press-fitting air into the second cylinder chamber 161b from the state in which the piston 162 of the upper cylinder 106 shown in FIG. On the other hand, the piston 162 is reduced and the upper surface masking unit 104 is lowered.
Then, the lower end of the push rod 143 comes into contact with the one end 171a of the cam 171, and the one end 171a is pushed downward, and the other end 171b rotates upward.

When the other end 171b of the cam 171 rotates upward, the side masking unit 103 connected to the other end 171b is pushed upward. As the side masking unit 103 moves up, the side masking unit 103 moves along the guide rail 108. Move inward.
The side masking unit 103 that moves inward contacts the side surface 1b of the inspection object 1, and the opening 11 on the side surface 1b is closed by the masking member 131 of the side masking unit 103.

In this case, even after the side surface masking unit 103 abuts on the side surface 1b, the upper surface masking unit 104 is lowered to such an extent that the side surface masking unit 103 is further pushed inward. Can be sealed.
Further, since the push rod 143 is provided corresponding to each cam 171, the side masking units 103 arranged at the four positions move simultaneously to close the openings 11 of the side surfaces 1 b. .

In this way, when the upper surface masking unit 104 is lowered by the upper cylinder 106 to close the opening 11 of the upper surface 1c that is the first surface of the object 1 to be inspected, a plurality of side surfaces 1b that are the second surface are provided. The opening 11 can be simultaneously closed by the side masking unit 103.
That is, just by operating one upper cylinder 106, the upper surface masking unit 104 is moved back and forth in the vertical direction that is the driving direction of the upper cylinder 106, and the driving direction of the upper cylinder 106 is changed by the cam mechanism 107. Since the side masking unit 103 can be advanced and retracted in a direction different from the advancing / retreating direction of the masking unit 104, the opening 11 on the upper surface 1c and the opening 11 on the side 1b can be closed simultaneously.
In particular, since the side masking unit 103 and the link mechanism 107 are provided corresponding to each side 1b, the opening 11 of the upper surface 1c and all four sides 1b can be simply operated by operating one lower cylinder 105. The opening 11 can be closed simultaneously.
As a result, the number of cylinders for advancing and retracting each masking unit can be reduced, and the leak test apparatus 100 can be reduced in size and cost.

Further, when the upper surface masking unit 104 is lowered by operating the upper cylinder 106, the weight of the upper surface masking unit 104 is applied to the piston 162 of the upper cylinder 106, so that only the air in the first cylinder chamber 161a is removed. It is possible to close the opening 11 of the upper surface 1c by lowering the upper surface masking unit 104 (even if air is not press-fitted into the second cylinder chamber 161b).
In this case, when the pressing force for closing the opening 11 of the side surface 1b is insufficient only by the weight of the upper surface masking unit 104, the second cylinder chamber 161b of the upper cylinder 106 is compensated for the insufficient pressing force. Just pressurize the air.

  When the upper surface masking unit 104 is lowered to close the opening 11 of the upper surface 1c, the downward force applied to the inspection object 1 from the upper surface masking unit 104 causes the bottom surface 1a of the inspection object 1 and the bottom surface masking unit 102 to The degree of close contact with the masking member 121 is increased, and the opening 11 of the bottom surface 1a can be more reliably closed.

The side masking unit 103 is cantilevered at its upper end by a cam 171, but a guide pin 132 a guided by the guide rail 108 is formed below the support plate 132.
When the side masking unit 103 moves upward as the top masking unit 104 is lowered, the upper portion thereof is guided inward by the cam 171. Further, the lower portion of the side masking unit 103 is also guided inward by the guide rail 108 and the guide pin 132a.
Accordingly, the upper and lower portions of the side masking unit 103 are both pressed toward the side surface 1b, and the masking member 131 of the side masking unit 103 can be brought into close contact with the side surface 1b with a uniform pressing force. .

[Third embodiment]
Next, a third embodiment of the leak test apparatus will be described.
The leak test apparatus 200 shown in FIG.
A bottom masking unit 202 which is a first masking unit for closing the opening 11 formed on the bottom surface 1a of the inspection object 1, and a second masking unit for closing the opening 11 of each side surface 1b. A side masking unit 203 and a top masking unit 204 which is a third masking unit for closing the opening 11 on the top surface 1c are provided. The side masking units 203 are provided in a number corresponding to the number of the side surfaces 1b on which the openings 11 are formed.
In the case of this example, the bottom surface 1a of the inspection object 1 is the first surface, the side surface 1b is the second surface, and the top surface is the third surface.

The bottom surface masking unit 202 is configured by attaching a masking member 221 for closing the opening 11 to the upper surface of the support plate 222. On the bottom face masking unit 202, the inspection object 1 is placed in a posture in which the bottom face 1 a faces the masking member 221.
In a state where the inspection object 1 is placed on the bottom surface masking unit 202, the opening 11 formed on the bottom surface 1 a is in close contact with the masking member 221 due to the weight of the inspection object 1 and is blocked by the masking member 221. ing.
The masking member 221 is disposed at the position, size, and number corresponding to the position, size, and number of the openings 11 formed in the bottom surface 1a, but may be provided over the entire surface of the bottom surface 1a. The masking member 221 is made of an elastic member such as rubber.
The bottom masking unit 202 is installed on the installation surface 209 by the support base 223.

In the vicinity of each side surface 1b of the object 1 to be inspected, side surface masking units 203 are arranged at predetermined intervals. In the case of this example, side masking units 203 are arranged at four locations corresponding to the left and right side surfaces 1b in FIG. 4 and the front and back side surfaces 1b (not shown).
The side masking unit 203 is configured by attaching a masking member 231 for closing the opening 11 to the inner side surface (surface on the inspection object 1 side) of the support plate 232. The masking member 231 is made of an elastic member such as rubber.
A guide pin 232a protrudes from the side of the support plate 232, and the guide pin 232a is inserted into a guide rail 208 supported by a support base 208a. The guide rails 208 are arranged at the inner height and the outer height. When the side masking unit 203 is raised, the side masking unit 203 is guided inward, and when it is lowered, it is guided outside.

  Below each side masking unit 203, cams 271 that can rotate around a fulcrum 272 are provided. The cam 271 is disposed in such a posture that its one end 271 a faces inward and downward and the other end 271 b faces outward and upward, and the other end 271 b is rotatably connected to the lower end of the support plate 232. ing.

A lower cylinder 205 is installed below the support base 223. The lower cylinder 205 includes a cylinder part 251 and a piston 252 that protrudes upward from the cylinder part 251 and can be expanded and contracted with respect to the cylinder part 251.
Further, the upper end of the push rod 253 fixed to the piston 252 of the lower cylinder 205 is located near the lower portion of the other end 271a of each cam 271.
The push rod 253 and the cam 271 constitute a link mechanism 207 as a driving force transmission unit that changes the driving direction of the lower cylinder 205 that is a driving unit of the side masking unit 203.
The lower cylinder 205 is a driving means for each side masking unit 203.

In the vicinity of the upper surface 1c of the inspection object 1, an upper surface masking unit 204 is disposed at a predetermined interval. The upper surface masking unit 204 is configured by attaching a masking member 241 for closing the opening 11 to the lower surface of the support plate 242. The masking member 241 is made of an elastic member such as rubber.
Above the upper surface masking unit 204, an upper cylinder 206 as a driving means for the upper surface masking unit 204 is disposed. The upper cylinder 206 includes a cylinder part 261 and a piston 262 that can expand and contract with respect to the cylinder part 261.
The piston 262 of the upper cylinder 206 is connected to the support plate 242 of the upper surface masking unit 204, and the upper surface masking unit 204 is supported by the upper cylinder 206 so as to be movable up and down. That is, the upper cylinder 206 is a driving means for the upper surface masking unit 204. The upper cylinder 206 is an air cylinder in this example, but a hydraulic cylinder or the like can also be used.

  In the leak test apparatus 200 shown in FIG. 1 described above, the side surface 1b of the inspection object 1 and the openings 11, 11,... .. Can be closed by operating 200 as follows.

That is, from the state where the piston 252 of the lower cylinder 205 shown in FIG. 4 is contracted, air is discharged from the first cylinder chamber 251a in the lower cylinder 205 and air is press-fitted into the second cylinder chamber 251b. In contrast, the piston 252 is extended to raise the push rod 253.
Then, the upper end of the push rod 253 comes into contact with the other end portion 271B of the cam 271 and the other end portion 271b is pushed upward to rotate.

When the other end 271b of the cam 271 rotates upward, the side masking unit 203 connected to the other end 271b is pushed upward. As the side masking unit 203 rises, the side masking unit 203 moves along the guide rail 208. Move inward.
The side masking unit 203 that moves inward contacts the side surface 1 b of the inspection object 1, and the opening 11 on the side surface 1 b is closed by the masking member 231 of the side masking unit 203.

In this case, even after the side surface masking unit 203 abuts on the side surface 1b, the piston 252 is raised to such an extent that the side surface masking unit 203 is further pushed inward, whereby the opening 11 is sealed by the masking member 231 formed of an elastic member. can do.
Further, since the push rods 253 are provided corresponding to the cams 271, the side masking units 203 arranged at the four locations move simultaneously to close the openings 11 of the side surfaces 1b. .

In this way, the push rod 253 is raised by the lower cylinder 205, and the openings 11 of the plurality of side surfaces 1b, which are the second surfaces of the inspection object 1, can be simultaneously closed by the side masking unit 203. ing.
That is, by operating the lower cylinder 205, the driving direction of the lower cylinder 205 can be changed by each cam mechanism 207, and the side masking unit 203 can be advanced and retracted in a direction different from the driving direction of the lower cylinder 205. Therefore, the opening 11 of the side surface 1b arranged in a direction different from the driving direction of the lower cylinder 205 can be closed.
In particular, since the side masking unit 203 and the link mechanism 207 are provided corresponding to each side surface 1b, all the openings 11 on the four side surfaces 1b are simultaneously closed by operating only one lower cylinder 205. can do.
As a result, the number of cylinders for advancing and retracting each masking unit can be reduced, and the leak test apparatus 200 can be reduced in size and cost.

  Further, the opening 11 on the upper surface 1c of the inspection object 1 discharges air from the first cylinder chamber 261a in the upper cylinder 206 from the state in which the piston 262 of the upper cylinder 206 shown in FIG. By press-fitting air into the chamber 261b, the piston 262 is extended with respect to the cylinder portion 261 to lower the upper surface masking unit 204, and the masking member 241 of the upper surface masking unit 204 is brought into close contact with the upper surface 1c to be closed.

As described above, when the upper masking unit 204 is lowered by operating the upper cylinder 206, the weight of the upper masking unit 204 is applied to the piston 262 of the upper cylinder 206, so that the air in the first cylinder chamber 261a is removed. The upper surface masking unit 204 can be lowered to close the opening 11 of the upper surface 1c only (without air being injected into the second cylinder chamber 261a).
In this case, when the pressing force for closing the opening 11 of the upper surface 1c is insufficient only by the weight of the upper surface masking unit 204, the second cylinder chamber 261b of the upper cylinder 206 is compensated for the insufficient pressing force. Just pressurize the air.

  Further, when the upper surface masking unit 204 is lowered to close the opening 11 on the upper surface 1c, the downward force applied to the inspection object 1 from the upper surface masking unit 204 causes the bottom surface 1a of the inspection object 1 and the bottom surface masking unit 202 to The degree of close contact with the masking member 221 is increased, and the opening 11 of the bottom surface 1a can be more reliably closed.

  As in the case of the first embodiment, the upper surface masking unit 204 is provided with a pressing guide 243. By the pressing guide 243, the upper end portion of the side masking unit 203 is moved to the side surface 1b side in the same manner as the lower end portion. It is possible to press.

It is a figure which shows 1st embodiment of a leak test apparatus, Comprising: It is side surface sectional drawing which shows the leak test apparatus of the state by which the opening part of each surface of a to-be-inspected object is not obstruct | occluded. It is a figure which shows 1st embodiment of a leak test apparatus, Comprising: It is side surface sectional drawing which shows the leak test apparatus of the state by which the opening part of each surface of a to-be-inspected object is obstruct | occluded. It is side surface sectional drawing which shows 2nd embodiment of a leak test apparatus. It is side surface sectional drawing which shows 3rd embodiment of a leak test apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inspected object 1a Bottom face 1b Side face 2 Bottom face masking unit 3 Side face masking unit 5 Lower cylinder 7 Link mechanism 10 Leak test apparatus 11 Opening

Claims (6)

A plurality of masking units for closing the openings on each surface in the inspection object having openings on a plurality of surfaces,
Drive means for advancing and retracting the masking unit;
A leakage test apparatus comprising a driving force transmitting means for transmitting the driving force of the driving means to a masking unit,
The leakage test apparatus according to claim 1, wherein the driving force transmission means is a link mechanism that changes the driving direction of the driving means and transmits the change to the masking unit.   The leak test according to claim 1, wherein a plurality of the driving force transmission means are provided, and a plurality of masking units are advanced and retracted in different directions via the driving force transmission means by operation of one driving device. apparatus. The masking unit has a first masking unit that closes the opening with respect to the first surface having at least one opening;
A second masking unit having at least one opening and closing the opening for a second surface arranged in a direction different from the first surface;
The first masking unit is driven back and forth in the direction to open and close the opening of the first surface by the driving means,
The second masking unit has an opening on the second surface different from the advancing / retreating direction of the first masking unit in conjunction with the advancing / retreating operation of the first masking unit by the driving means via the driving force transmitting means. The leak test apparatus according to claim 1, wherein the leak test apparatus is driven forward and backward in a direction to open and close the part. The inspection object is provided with a plurality of second surfaces arranged in different directions,
The leak test apparatus includes a second masking unit and a driving force transmission unit corresponding to each second surface,
The plurality of second masking units are driven to advance and retract in the direction of opening and closing the corresponding second surface opening via the driving force transmitting means in conjunction with the movement of the first masking unit by the driving means. The leak inspection apparatus according to claim 3, wherein:   The first surface is a bottom surface of the inspection object, and the inspection object is placed on the first masking unit with the first surface facing the first masking unit. The leak inspection apparatus according to claim 3 or 4, wherein the apparatus is movable in a vertical direction. The driving force transmitting means is connected to one end of the second masking unit, and in the vicinity of the other end of the second masking unit, the second masking unit is arranged in a direction to close the opening of the second surface. 6. A leak inspection apparatus according to claim 3, further comprising a guide member that presses the guide.

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