JPH023143Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application) The invention involves masking (sealing) a hollow object to be inspected, such as an intake manifold, and immersing it in an immersion tank while supplying fluid such as air. The present invention relates to a leak tester for inspecting leakage points of the object to be inspected, and more particularly, to a dipping device for a masking part in a leak tester equipped with a plurality of masking parts of different types.

(Prior art) In the case of a leak tester designed to inspect a leakage point in a hollow part of an object to be inspected, the opening of the object to be inspected is masked and air is supplied to the hollow part of the object to be inspected. A dipping device is equipped for dipping the specimen into the dipping tank. Conventionally, in a type of leak tester immersion device equipped with multiple masking sections of different types, when the test object is masked and immersed, not only the masking section that masks the test object but also the masking section that does not mask the test object are used. Other types of masking parts are also immersed in the immersion tank together with the object to be inspected.
For this reason, the immersion tank becomes large and compact design is obstructed, and depending on the shape and size of the object to be inspected, it may be difficult to confirm the immersion location.

(Purpose of the invention) The present invention is intended to eliminate the above-mentioned drawbacks of the prior art, and its purpose is to immerse only the masking part that masks the object to be inspected when immersing the object to be inspected. To provide an immersion device for a leak tester in which the other masking parts are configured so that they are not immersed, thereby making it possible to downsize the immersion tank and making it easier to confirm the leakage location of the object to be tested. be.

(Structure of the invention) In other words, the structure of the masking unit of the leak tester of the invention is such that a rotary drum is rotatably provided on the outside of a fixed drum having a circumferential groove, and a rotary drum is provided integrally with the rotary drum in the circumferential groove. A plurality of masking parts of different types that rotate automatically are slidably fitted together, and a cutout part that connects to the circumferential groove and extends toward the immersion tank allows the masking part to be moved toward the object to be inspected. a masking cylinder device for moving the connecting block toward the object to be inspected, and a masking cylinder device for moving the connecting block toward the object to be inspected; The device is characterized by being equipped with an immersion cylinder device for moving both to the immersion tank side at the same time.

(Function) In such a configuration, when masking the object to be inspected with the masking part and immersing it in the immersion tank, first, by rotating the rotating drum,
A masking part of a type suitable for the object to be inspected is moved along the circumferential groove, and when the masking part reaches the notch, the rotary drum is stopped, thereby causing the masking part to stop rotating. It is integrally engaged and connected to the connecting block from the direction.

Next, a masking cylinder device connected to the connecting block moves the masking section toward the object to be inspected, thereby masking the opening of the object to be inspected. After masking the opening of the object to be inspected,
Both the masking cylinder device and the object to be inspected are moved together to the immersion tank side by the immersion cylinder device.

As a result, only the masking part that masks the inspected object moves away from the circumferential groove of the fixed drum and toward the immersion tank, and the other masking sections that do not mask the inspected object move into the circumferential groove of the fixed drum. It remains fitted and is not immersed in the immersion tank together with the object to be inspected.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, the leak tester according to the present invention includes an immersion tank 1 in which water is stored, The masking unit 2 is generally constructed of a masking unit 2 which is disposed above a tank 1 so as to be movable up and down, and an elevating cylinder device 3 for elevating and lowering the masking unit 2.

Next, the structure of the masking unit 2 will be explained in detail with reference to FIG. In the figure, reference numeral 4 denotes a fixed drum in which a circumferential groove 5 extending in the circumferential direction is formed on the outer circumferential surface, and the circumferential groove 5 has a plurality of masking parts 7 having masking holders 6 of different sizes, etc. Here, four pieces are provided at equal intervals and slidably fitted together.

Reference numeral 8 denotes a rotary drum that is rotatably inserted into the outside of the fixed drum 4, and is rotatably driven via a chain 11 by a hydraulic motor (rotational drive source) 10 installed in the masking unit main frame frame 9. It is becoming more and more common. As the rotating drum 8 rotates, the plurality of masking parts 7 are configured to integrally rotate the rotating drum 8 along the circumferential groove 5 of the fixed drum 4.

Reference numeral 12 indicates a positioning cylinder device installed on the masking unit main body frame 9 to face the center of the rotating drum 8, and 13 indicates a plurality of cylinder devices (four in this case) spaced at equal intervals in the circumferential direction on the outer surface of the rotating drum 8. With the provided positioning section, the positioning cylinder device 1
By abutting the tip of the second rod 12a against the positioning part 13, accurate positioning of the masking part 7 with respect to the object W to be inspected set outside the rotary drum 8 can be obtained.

A notch 14 is formed in the fixed drum 4 at a position corresponding to the object W to be inspected, which is connected to the circumferential groove 5 and extends toward the immersion tank 1 side. This notch 1
4, a connecting block 15 is movable toward the object W to be inspected and has a notch 14 toward the immersion tank 1.
It is mounted so that it can move in the direction in which it extends. The front surface of the connecting block 15 (the radially outward surface of the fixed drum 4) is formed flush with the outer peripheral surface of the fixed drum 4.

On the front side of the connecting block 15, arcuate grooves 17, 17 are formed which are engaged with the arcuate protrusions 16, 16 on the back side of the masking part 7 in a concave and convex manner.
That is, the masking part 7 rotates along the circumferential groove 5 and reaches the notch 14, and the arcuate protrusions 16, 16 of the masking part 7 rotate from the circumferential direction of the fixed drum 4 to the circle of the connecting block 15. Arc-shaped groove 17,1
7, so that both members 7 and 15 are integrally connected.

18 is a masking cylinder device arranged inside the fixed drum 4, and the masking cylinder device 1
The tips of the eight rods 18a are integrally connected to the back side of the connecting block 15. This masking cylinder device 18 is provided to move the connecting block 15 attached to the notch 14 toward the object W to be inspected.

19 is a support base for supporting the masking cylinder device 18 via the frame 20; 21 is a work setting base connected to the support base 19 at a location not shown, and on which the object to be inspected W is set; 22 is an immersion cylinder device that is connected to the support base 19 and is used to lower both the support base 19 and the workpiece set base 21 toward the immersion tank 1 in the same direction as the direction in which the notch 14 extends. be.

In this embodiment, the support base 19 and the workpiece set base 21 are integrally connected.
It is also possible to provide a configuration in which both 19 and 21 are provided separately. However, even if the support base 19 and workpiece set base 21 are provided separately, both bases 19 and 21 are moved together toward the immersion tank 1 by the immersion cylinder device 22. Of course, it must be configured in such a way that it can be done.

Next, a case will be described in which an object to be inspected is immersed using the immersion apparatus having the above configuration. Here, the following description will be made assuming that the masking unit 2 has already been lowered by the lifting cylinder device 3 to a required height position near the liquid level of the water stored in the immersion tank 1 at which it can be immersed. shall be taken as a thing.

When immersing the inspected object W set on the workpiece set base 21, first, the rotary drum 8 is rotated via the hydraulic motor 10, and the masking part 7 of the type suitable for the inspected object W is cut off. When the notch 14 is reached, the rotation of the rotary drum 8 is stopped, and the positioning cylinder device 12 accurately positions the masking part 7 with respect to the object W to be inspected.

Here, the masking part 7 that is suitable for the object W to be inspected is completely separated from the circumferential groove 5 of the fixed drum 4, and the protrusions 16, 16 of the masking part 7 are connected to the connecting block 15 in the rotating direction. Concave groove 17,
17, and the masking part 7 and the connecting block 15 are automatically docked (connected).
do.

After the masking part 7 is integrally connected to the connecting block 15 installed in the notch 14, the connecting block 15 is connected to the outside of the fixed drum 4 by the masking cylinder device 18 connected to the connecting block 15. It is advanced toward the object W to be inspected, and the opening of the object W to be inspected is masked by the masking holder 6 of the masking section 7.

Thereafter, while the inspected object W is masked with the masking holder 6, air is supplied to the hollow part of the inspected object W by an appropriate means from an air source (not shown), and the support base 19 and the workpiece are The set base 21 is lowered toward the immersion tank 1 by the immersion cylinder device 22 until the masked part of the object W to be inspected is completely submerged under the water surface in the immersion tank 1. let Then, bubbles are generated from the leakage location of the object W to be inspected, so that the leakage location can be detected.

In this case, the other masking part 7 that does not mask the object to be inspected W is fitted into the circumferential groove 5 of the fixed drum 4, and the other masking part 7 is on the side of the immersion tank 1 together with the immersion cylinder device 22. There is no need to move or immerse yourself in the water. Therefore, the visibility of bubbles generated from the leakage location of the object W to be inspected is improved compared to the past.

After the immersion is completed, the support base 19 and the workpiece set base 2 are removed by the immersion cylinder device 22.
1 is raised to the original position, air supply to the hollow part of the object W to be inspected is stopped, and then the connecting block 15 is retreated to the original position of the notch 14 by the masking cylinder device 18.

Note that the above series of operations can be more completely automated by linking with a device that automatically detects air bubbles generated from a leakage location of the object W to be inspected and issues a signal.

(Effect of the invention) As explained above, according to the invention, when masking and immersing an object to be inspected, the other masking parts that do not mask the object to be inspected are not immersed in the immersion tank. It is possible to perform leakage inspections, reduce the size of the immersion tank, and
Even if the object to be inspected is complex and large in size, it is possible to confirm the leakage location of the object to be inspected more easily than before.

[Brief explanation of the drawing]

FIG. 1 is an overall front view showing an embodiment of the present invention;
2 is an overall side view of FIG. 1, and FIG. 3 is a sectional view of a main part of the masking unit of FIG. 1. DESCRIPTION OF SYMBOLS 1... Immersion tank, 2... Masking unit, 4... Fixed drum, 5... Circumferential groove, 6... Masking holder, 7... Masking part, 8... Rotating drum, 14... Notch part , 18... masking cylinder device, 19... support base, 21...
Work set base, 22... Immersion cylinder device.

Claims (1)

[Claims for Utility Model Registration] Masking the opening of a hollow object to be inspected with a masking unit, and placing the object to be inspected below the masking unit while supplying fluid to the hollow part of the object to be inspected. In the leak tester, the masking unit is installed in a rotary drum rotatably provided on the outside of a fixed drum, and in the fixed drum. a plurality of masking portions of different types that are slidably fitted into the formed circumferential groove and rotate integrally with the rotary drum; and a plurality of masking portions of different types that are formed on the fixed drum and are connected to the circumferential groove. a notch portion extending toward the immersion tank; and a notch portion that is mounted so as to be able to engage with the masking portion from the direction of rotation of the masking portion, and that is attached to an object to be inspected that is set on the outside of the fixed drum. a connecting block that is movable toward the object; a masking cylinder device that is connected to the connecting block and moves the connecting block toward the object to be inspected; and a masking cylinder device that is connected to the object to be inspected together with the masking cylinder device. and an immersion cylinder device for moving the leak tester to the immersion tank side.