JPH0792053A - Pressure leak inspection device - Google Patents

Abstract

PURPOSE:To precisely and efficiently perform the pressure leak inspection work or various works having a number of complicated opening parts such as a cylinder head with a simple structure. CONSTITUTION:The pressure leak inspection device has a body part 14 rotatable within a prescribed angle range, and first and second masking jugs 16, 18 provided on the body part 14 with a space of a prescribed angle. The first masking jig 16 has first to third seal members 68a, 68b, and 70 for blocking the valve guide hole parts 64a, 64b of a cylinder head 20 and an ignition plug hole part 66, a first cylinder 72 for protruding and recessing each first seal member 68a, and a second cylinder 74 for integrally protruding and recessing each third seal member 70 and the two second seal members 68b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure leakage inspection device for detecting pressure leakage of a work having a plurality of openings such as a cylinder head.

[0002]

2. Description of the Related Art A pressure leak inspection device is used for inspecting a hollow work such as a cylinder block or a cylinder head constituting an engine for pressure leak. This pressure leakage inspection device is provided with a seal member according to the number and shape of the openings provided in the work, and the compressed fluid is supplied into the work while the desired openings are closed by the seal member. The pressure fluctuation of the compressed fluid is detected to automatically inspect the work for pressure leakage.

By the way, since the shape and the like of the seal member provided in the pressure leakage inspection apparatus are set in correspondence with one work, the seal member is used when another work having a different shape is used. It is necessary to replace with a seal member corresponding to the other work. For this reason, a plurality of masking plates for sealing one side surface opening of various works are attached to each surface of a rotatable rotating body, and by rotating the rotating body, a masking plate corresponding to the work type is attached to the workpiece. There is proposed a masking device configured to index to a position facing one side surface (see Japanese Patent Laid-Open No. 3-144334).

[0004]

However, in the above-mentioned conventional technique, one side surface of the work is masked by the masking plate provided on each surface of the rotating body, and it is applied to the pressure leak inspection of the cylinder block. However, in the case of a workpiece that has a large number of openings such as a cylinder head, it cannot be handled by the masking plate as described above, and as a result, it is a dedicated tool that supports various openings for different models. Must be replaced with the seal member of. The cylinder head has a water jacket, an oil hole, a cam chamber, and a plurality of valve guide holes and spark plug holes. The number and position of these holes vary depending on the model. At the same time, it is necessary to seal with high accuracy. Therefore, it is necessary to change the plurality of seal members for closing the plurality of valve guide holes and the plurality of spark plug holes for each cylinder head model, and an efficient pressure leak inspection work cannot be performed. A problem has been pointed out.

The present invention is intended to solve this kind of problem, and for example, pressure leak inspection work of various works such as a cylinder head having a large number of complicated openings can be performed with high accuracy and with a simple structure. An object of the present invention is to provide a pressure leakage inspection device that can be efficiently performed.

[0006]

In order to solve the above-mentioned problems, the present invention closes various openings provided in a work and supplies a compressed fluid to the inside of the work to press the work. A pressure leakage inspection device for detecting a leak, comprising: a main body capable of being swung within a predetermined angle range via a swivel mechanism; a first masking jig and a second masking jig which are provided on the main body and are separated from each other by a predetermined angle. A masking jig, wherein the first masking jig includes a plurality of first seal members for selectively closing a plurality of openings provided in one work, and the plurality of first seals. A second actuator for moving the member forward and backward with respect to a predetermined opening, and the second masking jig,
A plurality of second seal members for selectively closing a plurality of openings provided in another work, and a second actuator for moving the plurality of second seal members forward and backward with respect to the predetermined openings. , Are included.

Further, the work is a cylinder head, and the first and second sealing members move forward and backward corresponding to a plurality of valve guide holes and ignition plug holes provided in different cylinder heads. It is preferably arranged freely.

[0008]

In the pressure leakage inspection apparatus according to the present invention, when the main body is turned by a predetermined angle under the action of the turning mechanism and the first masking jig is arranged corresponding to one work, the first actuator is operated. Is selectively driven to advance the desired first seal member to the side of the one work, and the desired opening of the work is closed by the first seal member. In this state,
A pressure leak inspection of a predetermined opening of the work is performed. At this time, by selectively advancing and retracting each of the first sealing members, it is possible to efficiently perform the pressure leak inspection work on various openings provided on the work.

Further, when performing a pressure leak inspection of another work different from the above-mentioned one work, the main body is turned through the turning mechanism, and the second masking jig corresponds to the other work. Will be placed. Then, similarly to the first masking jig, the second actuator is selectively driven to close a desired opening of another work by the second seal member,
The pressure leak inspection work of the other work is performed. Therefore,
With a simple structure in which the main body is rotated, various pressure leak inspection operations can be performed quickly and accurately for two different types of workpieces.

Further, a cylinder head is used as a work, and a plurality of valve guide holes and ignition plug holes provided in different cylinder heads are selectively closed by the first and second sealing members. Thus, various pressure leak inspection work of the cylinder head can be performed with high accuracy and efficiency.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pressure leakage inspection apparatus according to the present invention will be described in detail below with reference to the accompanying drawings.

1 and 2, reference numeral 10
Shows a pressure leakage inspection apparatus according to the present embodiment. The pressure leak inspection apparatus 10 includes a main body 14 that can be swung through a swivel mechanism 12 in a predetermined angular range (for example, 90 ° angular range).
And a first masking jig 16 and a second masking jig 18 which are provided on the main body 14 so as to be separated from each other by a predetermined angle, and the first or second masking jig 1
A lower masking jig 24 for closing the lower opening of the cylinder head 20 which is a work pressed and held by 6, 18 and a side masking jig 26 for closing the side opening of the cylinder head 20. With.

A bed 30 is provided on a base 28 which constitutes the pressure leakage inspection apparatus 10, and the lower masking jig 24 is
First masking jig 16 or second masking jig 18
The lower opening of the cylinder head 20, which is pressed and held by the combustion chamber EGR and the water jacket WJ.
(See FIG. 4) and the like are enclosed to seal the entire lower surface of the cylinder head 20.

As shown in FIG. 3, the side masking jig 26 includes side seal members 34a and 34b corresponding to one side of the two types of cylinder heads 20. The side seal members 34a, 34b are held by the slide base 36 via springs 38a, 38b so as to be movable back and forth with respect to one side of the cylinder head 20, and the slide base 36 is operated by the cylinder 40. The cylinder head 20 is configured to be movable back and forth along one side. A sealing cylinder 42 is arranged corresponding to a side opening of the cylinder head 20, that is, a position of a combustion chamber, a water jacket or the like (not shown), and a pressing member 44 is connected to a piston rod 42a of the sealing cylinder 42. It The side masking jig 26 is further provided with a seal member (not shown) capable of advancing and retracting corresponding to the other side parts of the two types of cylinder heads 20. The position of 20 is adjustable.

As shown in FIGS. 1 and 2, on the four columns 46 fixed to the base 28 in the vertical direction,
The lifting cylinder 48 is fixed, and the lifting cylinder 4
An elevating frame body 52 is held by a rod 50 extending downward from 8. Shafts 54a and 54b extending horizontally from both ends of the main body 14 are rotatably held on the elevating frame body 52, and a cylinder 56 constituting the turning mechanism 12 swings on the elevating frame body 52. Freely supported. A rod 58 extending downward from the cylinder 56 is engaged with the main body 14 via a mounting plate 60.

The cylinder head 20 constitutes a 4-cylinder 16-valve engine, and as shown in FIG. 4, two valve guide holes 64a and 64b are formed toward the respective combustion chambers EGR side. With this combustion chamber E
The spark plug hole 66 communicates with the GR. The first masking jig 16 is used for the pressure leak inspection of the cylinder head 20, and the valve guide hole 6 is provided.
8 first seal members 68a for closing 4a,
Eight second seal members 68b for closing the valve guide hole portion 64b, four third seal members 70 for closing the spark plug hole portion 66, and each first seal member 68a are moved forward and backward. Eight first cylinders (actuators) 72 for causing the respective third seal members 70 and 2
It is provided with four second cylinders (actuators) 74 for integrally advancing and retracting one second seal member 68b (see FIGS. 4 and 5).

As shown in FIG. 4, the first cylinder 72 is
A cylinder 78 is connected to a rod 76 extending from the first cylinder 72 while being fixed to the body portion 14 while being inclined in the vertical direction. A first seal member 68a is engaged with the cylindrical body 78 via a floating spring 80, and an O-ring 82 is attached to the tip of the first seal member 68a.

The second cylinder 74 is fixed to the main body portion 14 while being inclined in the opposite direction to the first cylinder 72,
The connecting plate 8 is connected to the rod 84 extending from the second cylinder 74.
6 is fixed. The connecting plate 86 has two cylindrical bodies 88 and 1
The tubular body 90 of the book is integrally determined, and the second sealing member 6 is provided to each tubular body 88 via a floating spring (not shown).
8b is engaged, and the third seal member 70 is engaged with the tubular body 90 via the floating spring 94.

As shown in FIGS. 2 and 5, the main body 14
Cylinders 96a, 96b on the shafts 54a, 54b side of
The side seal members 98a and 98b that can move back and forth are disposed through the cylinders. The side seal members 98a and 98b close the openings provided on both upper side portions of the cylinder head 20.

The second masking jig 18 has the same structure as the first masking jig 16 and closes another cylinder head 20 different from the cylinder head 20. And a cylinder (actuator) for advancing and retracting the seal member. Illustration of the seal member and the cylinder is omitted.

The pressure leak inspection device 10 having the above-mentioned structure
The operation of will be described.

When performing the pressure leakage inspection of the cylinder head 20, first, the first masking jig 16 is arranged downward (see FIGS. 1 and 2). Then, the lower opening of the cylinder head 20 is entirely closed by the lower masking jig 24.

On the other hand, the side portion of the cylinder head 20 is closed by the side portion masking jig 26. In the side masking jig 26, as shown in FIG. 3, the cylinder 40 is driven to move the slide base 36 forward and backward, and the side seal member 34 a is positioned corresponding to the pressing member 44, for example. Then, the sealing cylinder 42 is driven and the pressing member 44 advances, so that the side sealing member 34a
Closes the opening provided on one side of the cylinder head 20 against the spring 38a. The other side of the cylinder head 20 is closed by another seal member (not shown).

Then, the lifting cylinder 48 is driven,
After the elevating frame body 52 descends and the main body portion 14 is placed at a predetermined height position, the cylinder 9 provided in the main body portion 14 is moved.
6a, 96b are driven, and side seal members 98a, 98
The openings on both upper sides of the cylinder head 20 are closed by b. Further, as shown in FIG.
When 2 is driven, the cylindrical body 78 advances to the cylinder head 20 side integrally with the rod 76, and the first sealing member 68a supported by the cylindrical body 78 is the valve guide hole portion of the cylinder head 20. 64a is closed. On the other hand, under the action of the second cylinder 74, the two tubular bodies 88 are connected via the connecting plate 86.
And one tubular body 90 integrally advance to the cylinder head 20 side, and two second seal members 68b and one third seal member 70 form two valve guide holes 64b and one spark plug. The hole 66 and the hole 66 are closed at the same time.

Therefore, in this embodiment, each first cylinder 7
By selectively driving the second cylinder 74 and the second cylinder 74, the valve guide holes 64a and 64b and the spark plug hole 66 located at desired positions of the cylinder head 20 can be selectively closed. it can. Therefore, it is possible to obtain the effect that the desired pressure leak inspection work can be reliably and promptly performed on various openings of the cylinder head 20.

By the way, when the pressure leakage inspection of the cylinder head 20 different from the cylinder head 20 is performed, first, the main body portion 14 is lifted via the lifting cylinder 48, and then the cylinder forming the turning mechanism 12 is moved. Under the action of 56, the rod 58 is raised. As a result, the main body 14 turns 90 ° in the direction of arrow A in FIG. 1 via the mounting plate 60, and the second masking jig 18 is arranged below in correspondence with the new cylinder head 20. Then, similar to the first masking jig 16, a new masking operation for the cylinder head 20 is performed via the second masking jig 18.

As described above, in the present embodiment, the valve guide holes 64a and 6 which are particularly large in number and need to be closed with high precision among the openings provided in the cylinder head 20.
4b and the first masking jig 16 and the second masking jig 18, which are used to close the spark plug hole 66,
It is configured to be turnable via a turning mechanism 12. Therefore, when performing a pressure leak test on two different types of cylinder heads 20, it is possible to simply and swiftly respond by simply rotating the main body 14 by 90 °. Moreover, there is an effect that the entire structure of the pressure leakage inspection device 10 is simplified and space can be easily saved.

By mounting three or more masking jigs on the main body 14, pressure leak inspection of various types of cylinder heads can be performed.

[0029]

According to the pressure leakage inspection apparatus of the present invention,
The first actuator constituting the first masking jig is selectively driven to close the desired hole of the one work by the desired first seal member, and the pressure leak inspection of the one work is performed. At this time, by selectively advancing and retracting the first seal member, it is possible to efficiently perform the pressure leak inspection work on various openings provided in one work.

Further, when performing pressure leak inspection of another work different from the above-mentioned one work, the main body is turned through the turning mechanism, and the second masking jig corresponds to the other work. After the arrangement, the second actuator is selectively driven to close the desired hole of the other work by the second seal member, and the pressure leak inspection work of the other work is performed. Therefore, it is possible to quickly and surely perform various pressure leak inspection operations on two or more different works with a simple configuration in which the main body is turned.

Further, a cylinder head is used as a work, and a plurality of valve guide holes and spark plug holes provided in different cylinder heads are selectively closed by the first and second sealing members. Thus, various pressure leak inspection work of the cylinder head can be performed with high accuracy and efficiency.

[Brief description of drawings]

FIG. 1 is a front view of a pressure leakage inspection device according to an embodiment of the present invention.

FIG. 2 is a side view of the pressure leakage inspection device.

FIG. 3 is an explanatory diagram of a side masking jig that constitutes the pressure leakage inspection device.

FIG. 4 is a partially sectional enlarged front view of a first masking jig which constitutes the pressure leakage inspection apparatus.

FIG. 5 is a bottom view of the first masking jig.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Pressure leak inspection device 12 ... Swivel mechanism 14 ... Main body part 16, 18 ... Masking jig 20 ... Cylinder head 24 ... Lower masking jig 26 ... Side masking jig 34a, 34b ... Side seal member 48 ... Elevating Cylinder 52 ... Elevating frame 56 ... Cylinders 64a, 64b ... Valve guide hole 66 ... Spark plug hole 68a, 68b, 7
0 ... Seal member 72, 74 ... Cylinder

Claims (2)

[Claims] 1. A pressure leakage inspection apparatus for closing various openings provided in a work and supplying a compressed fluid to the inside of the work to detect a pressure leak of the work, comprising: And a first masking jig and a second masking jig, which are provided on the main body so as to be separated from each other by a predetermined angle, respectively, and the first masking jig includes: A plurality of first seal members for selectively closing a plurality of openings provided in one work; and a first actuator for moving the plurality of first seal members forward and backward with respect to predetermined openings, respectively. And a plurality of second seal members for selectively closing a plurality of openings provided in another work, and the plurality of second seal members. Each pressure leakage inspection apparatus characterized by having, a second actuator for advancing and retracting with respect to a predetermined opening. 2. The pressure leakage inspection apparatus according to claim 1,
The work is a cylinder head, and the first and second sealing members are arranged so as to be movable back and forth corresponding to a plurality of valve guide holes and ignition plug holes provided in different cylinder heads. A pressure leakage inspection device characterized in that