JPS6255538A - Submerging type pressure leakage inspecting device - Google Patents

Abstract

PURPOSE:To enable highly accurate measurement for checking the presence of pressure leakage of a work, by arranging the work to be rotatable in water tank. CONSTITUTION:A work W is arranged on a lower jig 62 while a press cylinder 94 is driven to lower an air supply member 98 and presses an upper jig 108 mounted on the member 98 sealed on the top of the work W. When air is fed to cylinders 72a and 72b from sealing air supply tubes 102a and 102b, the work W is pressed securely with sealing members 76a and 76b. Then, a lift mechanism 22 is driven to move piston rods 24a-24d upwards until the work W submerges into a water tank 26. Here, when there is a pinhole or the like in the work W, air sealed into the work W leaks and can be observed from windows 44a-44c for observing work. Moreover, the work W can be turned integral with the jigs 62 and 108 through a rotation mechanism to inspect the entire surface of the work W.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a submerged pressure leak testing device7, and more specifically, for example, a cylinder block, a water jacket such as a cylinder head, a water jacket such as a cylinder head, a water jacket such as a cylinder head, a water jacket such as a cylinder head, a water jacket such as a cylinder head, etc., and a predetermined pressure A submersion method that makes it possible to determine the quality of a molded product by enclosing air in it, submerging it in water, and freely rotating the molded product in water to observe the presence or absence of air bubbles generated from the molded product. This invention relates to a pressure leak inspection device.

Generally, in a cast molded product, cracks or pinholes may occur on the wall surface of the hole due to casting defects, which may cause air leakage from the hole.

However, in parts that require complete sealing, such as the water jacket of the cylinder block, cylinder head, etc. that make up the engine, and the oil hole, such air leakage can be a fatal defect in the parts. Therefore, it is necessary to inspect whether or not there are pinholes, cracks, etc. in the hole.

Conventionally, such inspections involve supplying air at a predetermined pressure to the workpiece in a sealed manner, introducing the workpiece into a water tank, and observing the generation of air bubbles caused by air leaking from pinholes and cracks in the workpiece body. However, if the presence of the bubbles is confirmed, a method is generally used in which the workpiece is determined to be defective.

However, in the conventional technique described above, the inspector must look into the water tank from the front of the water tank in order to confirm the generation of bubbles in the workpiece. Therefore, although it is relatively easy to visually check the front part of the workpiece, for example, if there is another attached device in the vicinity of the water tank, it becomes difficult to visually check the presence or absence of air bubbles in the part corresponding to that position. , there is the disadvantage that sufficient testing is not carried out. That is, if there are minute pinholes or cracks in the workpiece and the bubbles generated therefrom remain attached to the workpiece surface and do not appear on the water surface, it will be impossible to confirm the bubbles. After all, in the above-mentioned state, a substantially defective workpiece may be mistaken as a good product, and it is pointed out that the molded product cannot be completely and reliably inspected.

The present invention has been made to overcome the above-mentioned disadvantages, and by submerging a workpiece as an object to be inspected in a water tank and configuring the workpiece to be rotatable,
This submerged pressure leak test allows the entire workpiece to be observed easily and accurately, making it possible to inspect the workpiece for the presence or absence of cracks, pinholes, etc. with extremely high accuracy. The purpose is to provide equipment.

In order to achieve the above object, the present invention fills a workpiece to be inspected with fluid at a predetermined pressure, submerges the workpiece in a water tank, and observes whether or not air bubbles are generated, thereby detecting pressure leaks in the workpiece. In the pressure leakage inspection device configured to perform inspection, the workpiece is configured to be rotatable within the water tank.

Next, preferred embodiments of the submerged pressure leak testing device according to the present invention will be described in detail with reference to the accompanying drawings.

In FIGS. 1 to 3, reference numeral 10 indicates a base that constitutes a pressure leak testing device according to the present invention. Said base 1
An arm rotation shaft 12 is erected in the center of the base 10 (see FIG. 3), and the arm rotation shaft 12 engages with a drive mechanism (not shown) disposed within the base 10, and its An arm 14 is attached to one end. The arm 14
each includes jig stands 16a to 16d that extend vertically downward and are bent midway to extend horizontally outward.

Engagement pins 17a and 17b are fixed to each of the jig stands 16a to 16d at a predetermined distance. Further, pillars 18a to 18c are erected on the base 10 at predetermined distances apart from each other about the arm rotation shaft 12. In this case, the arm rotation shaft 1 is attached to the pillars 18a to 18c.
A pair of arc-shaped slide bases 20a to 20c and 21a to 21c having different radii with reference to 2 as the center are mounted.

Therefore, as shown in FIG. 3, an aquarium lifting mechanism 22 is provided on the left end side of the base 10. One end of piston rods 24a to 24d extending vertically from a cylinder (not shown) constituting the lifting mechanism 22 is engaged with the lower end of the water tank 26. In this case, support columns 28a to 28d are inserted into the respective piston rods 24a to 24d, and the support columns 28a to 28d are inserted into the slide bases 30a and 30b.
is supported.

That is, the water tank 26 has a bottom portion 32a and a bottom portion 32a.
and a side wall portion 32b standing vertically upward from the bottom portion 32a, and the piston rods 24a to 24
d, and the cylindrical portions 34a to 34d, into which the support columns 28a to 28d are displaceably fitted, are engaged. Note that when introducing a predetermined amount of water into the water tank 26, the cylindrical portion 34
In order to prevent water leakage from a to 34d, the support columns 28a to 28d and the cylindrical portions 34a to 34d should be liquid-tightly fitted, or if necessary, a sealing ring should be attached to the cylindrical portions 34a to 34d. It is preferable to attach it to the

On the other hand, in the center of the bottom portion 32a, there is a bulge portion 3 directed downward.
6, and an irradiation window 38 is formed on one end side of the bottom portion 32a, to which a glass plate 40 is liquid-tightly fixed using an adhesive or the like. Further, the side wall portion 32b is
In this case, eight mutually connected surfaces 42a to 42h
(see Fig. 1), the surface 42a is located at the front of the water tank 26, and forms a workpiece observation window 44a there, as well as workpiece observation windows 42b and 42h sandwiching the surface 42a. Sections 44b and 44C are formed. Here, glass plates 46a to 46C corresponding to the shapes of the workpiece observation windows 44a to 44C are arranged on the glass plates 40.
It is fixed in the same way. Further, an L-shaped mounting base 48 is fixed to the lower end of the surface 42e, and this mounting base 48
(See Figure 3)
.

By the way, the respective slide bases 3Qa and 30b that are attached to the support columns 28a to 28d are the same as the slide base 20a.
20c to 21a to 21c, and a push-up mechanism 52 is attached to the slide bases 3Qa and 30b. A piston rod 56 extends vertically upward from a cylinder portion 54 constituting the push-up mechanism 52, and a hole 57 is bored in the cylinder portion 54 in parallel to the piston rod 56. Then, the push-up plate 58 engages with the piston rod 56, and the push-up machine 5
One end of a guide bar 60 is fixed to 8, and the guide bar 60 is fitted into the hole 57 to hold the push-up plate 58.

Further, a lower jig 62 is placed on each of the slide bases 30a and 30b. In this case, the engagement pins 17a, 1
7b, and place this lower jig 6 on the jig table 16a, for example.
Attach 2. A hole 66 into which the piston rod 56 of the push-up mechanism 52 is loosely fitted is provided approximately at the center of the bottom surface of the lower jig 62.
A work W is provided on the upper surface of the lower jig 62.
A sealing member 68 is attached to fix and seal. Fixing bases 70a and 70b are provided on both sides of the seal member 68, respectively.
(see Figures 1 and 2), and each fixed stand 70
a, 70b are cylinder toughs 2a, 7 for sealing the side of the workpiece.
Attach 2b. Seal members 76a and 76b are engaged with the respective piston rods 74a and 74b extending from the cylinders 72a and 72t. Fixing mechanisms 73a and 78b are provided on the respective fixing bases 70a and 70b.

A piston rod 82a extending from a cylinder portion 80a constituting the fixing mechanism 78a engages with a substantially central portion of a link member 84a. One end of this link member 84a is supported by the fixed base 70a, and the other end is supported by the locking member 8.
6a. In this case, an inclined surface 88a is provided at the tip of the locking member 86a over a predetermined length.
(See Figure 2).

Note that the fixing mechanism 78b is constructed in the same manner as the fixing mechanism 78a described above, and the same constituent elements are designated with b in the reference numeral and their description will be omitted.

On the other hand, in the base 10, support arms 90a and 90b are erected on both sides of the elevating mechanism 22 (see FIGS. 1 and 2), and support arm members 9 are provided on the support supports 90a and 90b.
Attach 2. A pressure cylinder 94 is fixed to the support arm member 92, and a supply member 98 for supplying fluid such as air is connected to one end of a rond member 96 extending from the pressure cylinder 94. The air supply member 98
The inspection air supply pipes 100a to 100C and the sealing air supply pipes 102a and 102b are connected to the cylinder 72, respectively.
a, communicates with 72b. Further, guide bars 104a and 104b erected on both sides of the air supply member 98 are fitted into holes 106a and 106b of the support arm member 92, so that when the air supply member 98 reaches the lowest position, At this time, the guide bars 104a and 104b are arranged such that their respective ends are spaced apart from the support arm member 92 by a predetermined distance.
(7) Select the length.

Then, the lower jig 108 is engaged with the air supply member 98.

As shown in FIG. 1, inclined surfaces 110a and 110b that engage with fixing mechanisms 73a and 78b are formed on both longitudinal end surfaces of the upper jig 108, respectively, and a seal member 112 is provided on the F end surface. In this case, the upper jig 10 is in communication with the inspection air supply pipes IJ)Oa to 100C. Further, a stopper 114 having a predetermined length is fixed to one end of the lower part of the upper jig 108. On the other hand, a handle 116 is fixed to the upper jig 108 at a predetermined position. It has an L-shape, and its end extends above the water tank 26. Therefore, the push-up mechanism 52
After the lower jig 62 is raised a predetermined distance under the driving action of the handle 116, the inspector can freely rotate the workpiece W by operating the handle 116. For this reason, the handle 116 is provided at a position where the inspector can easily operate it, and for example, it may be provided on the lower jig 62.

In FIG. 2, reference numeral 118 indicates a position detection sensor, which can detect the operating state of the fixing mechanism 78a.

The submerged pressure leak testing device according to the present invention is basically constructed as described above, and its operation and effects will be explained next.

First, the workpiece W is placed on the lower jig 62, and the press cylinder 94 is driven to lower the air supply member 98, which is attached to the tip of the mouth/throat member 96. As a result, the upper jig 108 attached to the air supply member 98 presses and seals the upper surface of the workpiece W. In this case, upper jig 1
A stopper 114 fixed to the seal member 68, 114 contacts the work W to adjust the pressing state between the seal members 68, 112 and the work W. Therefore, the sealing air supply pipes 102a, 1
If air is supplied from 02b to the cylinders 72a, 72b, the workpiece W will be delivered to the cylinders 72a, 72b for 4'h.
It is pressed and fixed from both sides by seal members 76a and 76b which are fF.

In this way, the inspection air supply pipe 100a is attached to the work W which is completely hermetically fixed by the lower jig 62 and the upper jig 108.
Air at a predetermined pressure is supplied from ports 100c to 100c. on the other hand,
A predetermined amount of water is stored in the water tank 26 in advance, and
A light 50 attached to this water tank 26 is turned on. Next, the lifting mechanism 22 is driven to move the piston rod 24a.
24d to 24d are moved upward to submerge the work W in the water tank 26.

As described above, when the workpiece W is submerged in the water tank 26, the air sealed in the workpiece W, if there is a pinhole, crack, etc. in the workpiece W, passes through it and leaks into the water. It comes to that. Therefore, workpiece observation windows 44a to 44c are provided on the front surface 42a and side surfaces 42b and 42h of the water tank 26, and the light 50 is illuminated from the irradiation window 38 into the water tank 26. Since light is introduced, the inspector can easily see the front and some side surfaces of the workpiece W from the front of the water tank 26.

Further, the lower jig 62) workpiece W and the upper jig 108 are rotated together to inspect the entire surface of the workpiece W. That is, first, when the cylinder parts 80a and 80b constituting the respective fixing mechanisms 78a and 78b are driven to displace the piston rods 82a and 82b toward the work part, respectively, the locking member 86a is moved through the link members 34a and 84b. ,86b
is displaced toward the workpiece section. Therefore, the inclined surfaces 88a and 88b formed on the locking members 86a and 86b engage with the inclined surfaces 110a and 110b of the upper jig 108, and as a result, the main jig 108 is integrated with the lower jig 62. Fixed. In this case, the state of engagement between the upper jig 108 and the lower jig 62 can be easily grasped via the sensor 118.

Next, after stopping the driving of the pressing cylinder 94, the cylinder portion 54 constituting the pushing up mechanism 52 is driven to displace the piston rod 56 extending vertically upward.

With this upward displacement of the piston rod 56, the push-up plate 58
is raised, the piston 1 tip 56 is loosely fitted into the hole 66, and the push-up plate 58 comes into contact with the lower jig 62 and presses it upward. Therefore, the lower jig 62 rises and the engaging pins 17a, 17 are removed from the holes 54a, 64b.
b is separated, and the lower jig 62 becomes rotatable around the piston rod 56.

Therefore, when the inspector grasps the handle 116 and rotates it in a predetermined direction, the lower jig 62) workpiece W and the upper jig 108 rotate integrally. In other words, the inspector can place and visually check all sides of the workpiece W in desired positions simply by standing in front of the water tank 26, and as a result, the presence of air leaking from pinholes, etc. of the workpiece W can be accurately detected. It is possible to check. In this case, the respective guide bars 104a and 104b erected on the air supply member 98
Since the guide bars 104a and 104b are spaced apart from the holes 106a and 106b of the support arm member 92, the guide bars 104a and 104b do not interfere with the rotation of the workpiece W.

In this way, as a result of observing the presence or absence of air bubbles over the entire surface of the workpiece W, if the generation of air bubbles or the adhesion of microbubbles from the workpiece W is confirmed, this workpiece W is selected as a defective product, On the other hand, if the generation of bubbles is not confirmed in the workpiece W, the workpiece W is determined to be a good product.

After inspecting the quality of the work W as described above, the handle 116 is rotated to place the work W at a predetermined angular position. Therefore, under the driving action of the push-up mechanism 52, the lower jig 62
is lowered and the engaging bins 17a, 17b are inserted into the holes 64a, 64.
b, and place the lower jig 62 on the jig stand 16a. Next, when the respective locking members 86a and 86b are separated from the upper jig 108 under the driving action of the fixing mechanisms 78a and 78b, the upper jig 108 is released from the engagement relationship with the lower jig 62.

Furthermore, the lifting mechanism 22 is driven to lift the piston rod 24a.
By lowering 24d to 24d, the water tank 26 is returned to the predetermined position, and the supply of inspection and sealing air to the workpiece W is stopped. Then, after driving the press cylinder 94 to separate the upper jig 108 from the workpiece W, this workpiece W is removed from the lower jig 62, and a new workpiece W is attached to the lower jig 62 and the lower jig according to the above-mentioned installation procedure. 108, and the submersion test is repeated again.

By the way, for example, if the lower jig 62 is similarly provided on the jig stands 16b to 16d and the workpiece W is fixed on each of them, the arm rotating shaft 12 can be rotated after the pressure leakage test on the jig stand 16a is completed. By driving, the next jig stand 16b can be placed on the water tank 26 to inspect a new workpiece W.

Furthermore, if the arm rotation shaft 12 is rotated and the jig tables 16c and 16d are similarly placed at the inspection position to inspect each workpiece W, the pressure leakage inspection of the workpiece W can be made even more efficient. This has the advantage of being a suitable means especially when forming a large number of workpieces by line production or the like.

As described above, according to the present invention, after submerging the work,
This workpiece can be freely rotated within the water tank. Therefore, the inspector can place a desired surface of the workpiece in front of the inspector simply by operating the handle from the front of the tank. It also becomes possible to accurately inspect the entire workpiece. Moreover, by providing a workpiece observation window in the water tank and illuminating the inside of this water tank through the irradiation window, even if a small amount of air leaks into the workpiece through a pinhole, etc., it can be prevented. This can be easily confirmed, and the effect of highly accurate inspection for the presence or absence of pressure leaks in the workpiece can be achieved.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments. For example, the mounting position of the handle, the shape of the water tank, etc. may be selected in various ways as necessary. Of course, various improvements and changes in design are possible without departing from the gist of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a submerged pressure leak testing device according to the present invention, FIG. 2 is a partially omitted front view of the inventive device, and FIG. 3 is a partially omitted side view of the present invention device. 10... Base 12... Rotating shaft 14
...Arm 16a-16d...Jig stand 22...Elevating mechanism 26...Water tank 38
...Irradiation window

Claims (5)

[Claims] (1) A pressure leak inspection device configured to inspect the work for pressure leaks by filling the work to be inspected with fluid at a predetermined pressure, submerging the work in a water tank, and observing the presence or absence of bubbles. 2. A submerged pressure leakage testing device, wherein the workpiece is configured to be rotatable within the water tank. (2) The apparatus according to claim 1, further comprising a fixing means for integrally coupling a lower jig for placing a workpiece and an upper jig for pressing the workpiece under the action of a drive source; A submerged pressure leak testing device comprising a lower jig, a rotating means for integrally rotating a workpiece and an upper jig. (3) In the device according to claim 2, the fixing means includes a cylinder provided on the lower jig, and a locking member that engages with the cylinder and has an inclined surface at one end,
A slope is formed on the upper jig, and the locking member is displaced in a predetermined direction under the action of the cylinder to engage the slope of the locking member with the slope of the upper jig. A submerged pressure leak inspection device configured to be connected to a jig. (4) In the device according to claim 2, the rotating means includes a push-up mechanism provided on a slide base on which the lower jig is placed and a handle fixed to the lower jig or the upper jig. , the lower jig is displaced vertically upward under the action of the push-up mechanism, the lower jig is engaged with the push-up plate that constitutes the push-up mechanism, and the lower jig, the workpiece, and the upper jig are moved through the handle. A submerged pressure leak testing device configured to rotate the tool integrally. (5) The apparatus according to claim 1, wherein the water tank is provided with a work observation window and an irradiation window, and the inside of the water tank is illuminated from the irradiation window via a light source. Type pressure leak inspection device.