JPS63109345A - Airtightness inspection apparatus - Google Patents

Abstract

PURPOSE:To suppress the generation of air bubbles at the time of inspection and to shorten an inspection time, by providing a liquid tank having an inspection liquid received therein and a support plate mounted to a support shaft on one end side in the longitudinal direction thereof and arranged on the upper part side of the liquid tank in a revolvable manner. CONSTITUTION:A plurality of punched holes are provided to both sides of a support plate 17 in the lateral direction thereof so as to form a row and an airtightness inspection object A is clamped to the support plate 17 through a clamp means 20 and, in this state, the whole is revolved by an actuator to be immersed in an inspection liquid 13. At the same time, compressed air is supplied into the object A from a compressed air source 33 through a hose 34. By this method, the object A can be sunk in the inspection liquid 13 at a constant speed along with the support plate 17 and the means 20 by the actuator and the generation of bubbles at the time of sinking can be suppressed by the punched holes of the support plate 17 and an inspection time can be shortened.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention inspects whether an object to be tested for airtightness (hereinafter referred to as a work), such as a pump casing or a filter casing, is formed air-liquidtight. The present invention relates to an airtightness testing device suitable for use in, and particularly relates to an airtightness testing device capable of testing airtightness in a short time.

[Prior art]

For example, in a fuel pump that supplies fuel in a fuel tank to an internal combustion engine for an automobile, fuel cannot be discharged at a desired discharge pressure unless the pump casing is formed to be air-liquid tight.

As shown in FIG. 5, this type of pump casing consists of a cylindrical body 1 formed to have a diameter of, for example, 50 mm and a length of about 100 mm, and covers 2 ( However, each cover 2 is fitted into the cylindrical body 1 via an O-ring 3, and then caulked 4.4. It is fixed to the cylindrical body 1 by... One cover 2 is provided with a fuel suction port 5, and the other cover (not shown) is provided with a fuel discharge port 6.

However, if a caulking failure occurs at each of the caulking points 4, fuel (pressurized by the pump) may leak to the outside from, for example, between the cylinder body 1 and the cover 2. It is necessary to check the air-liquid tightness of A in advance.

For this reason, in the prior art, for example, the discharge port 6 is closed with a plug or the like, the suction port 5 is connected to a pressure source via a hose, etc., and the entire pump casing A is immersed in the test liquid in the liquid tank. The inside of the pump casing A is pressurized by the pressurized air source, thereby inspecting the air-liquid tightness of the pump casing A as a workpiece.

That is, if there is a caulking defect in each of the caulking parts 4, air bubbles will be generated from the melting caulking parts 4, so that the operator can visually check the caulking defective part, and the workpiece such as the pump casing A can be easily inspected. can be inspected for airtightness.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional technology, when a workpiece such as the pump casing 8 is immersed in the test liquid, a large amount of bubbles is generated around the workpiece, resulting in poor caulking. It becomes impossible to distinguish between the bubbles generated from the point and the bubbles. For this reason, conventional technology takes measures such as waiting for the bubbles to disappear for about 30 to 60 seconds and pressurizing the inside of the workpiece with a pressure air source, but this significantly increases the inspection time per workpiece. It has the disadvantage of being stored away.

The present invention was made in view of the above-mentioned drawbacks of the prior art.1 The present invention is an airtight system that can reliably suppress the generation of bubbles when depositing a workpiece, and can significantly shorten the inspection time per workpiece. The present invention provides an inspection device.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention has been made.

A liquid tank having an open upper side and containing a test liquid therein; a thin plate-shaped support plate having one longitudinal end attached to a support shaft and rotatably arranged on the upper side of the liquid tank; and the support plate. A plurality of punched holes located on both sides in the width direction of the plate and arranged in a row in the longitudinal direction of the support plate, and a plurality of punched holes provided on the support plate located between the punched holes on both sides, and an airtight inspection hole. clamping means for clamping an object; a hose having one end connected to a pressure air source and the other end connected to the clamping means for supplying pressurized gas into the object; the support plate and the clamping means. In order to submerge the airtightness test object together with the test liquid in the liquid tank, an actuator that rotates the support plate is adopted.

[Effect]

A plurality of punched holes are arranged in the longitudinal direction on both sides of the thin support plate in the width direction, and the support plate is rotated by a seven-cut unit to place the object to be tested for airtightness into the test liquid together with the support plate and the clamping means. Since the actuator allows the workpiece to be immersed in the test liquid at a constant speed, the generation of bubbles is greatly suppressed by punching holes in the support plate. can do. Then, during inspection, it becomes possible to quickly visually confirm that air bubbles are generated from a location where caulking is defective or the like.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4. In the embodiment, the case where the pump casing A shown in FIG. 5 described above is used as a workpiece will be exemplified, and the explanation thereof will be omitted.

In the figure, reference numeral 11 indicates the housing of the airtightness inspection device. Inside the housing 1, a front chamber 11A with a low height and a rear chamber 11B with a high height are provided, and a partition plate 11 is provided between these.
C etc. are arranged. Reference numeral 12 denotes a liquid tank provided in the upper part of the front chamber 11A, and the liquid tank 12 is formed into a large box shape from transparent tempered glass or the like, and its upper side is open. In the liquid tank 12, a test liquid 13 such as water or oil is stored. In addition, the liquid tank 12
Explosion-proof fluorescent lamps 14, 14 and the like are provided below to illuminate the inside of the liquid tank 12.

Reference numeral 15 indicates a support shaft located above the liquid tank 12 and disposed at the front of the rear chamber 11B, and reference numeral 16 indicates a rotating arm rotatably supported by the support shaft 15. Boss portions 16A and 16B are provided at both ends of the support shaft 16, respectively. The front boss portion 16A is rotatably attached to the support shaft 15, and the rear boss portion 16B is rotatably attached to an air cylinder 35, which will be described later. The rotating arm 16 is connected to the air cylinder 3.
5, it can be rotated in the direction of arrow B about the support shaft 15. Further, a thin plate-like platen 16C is integrally provided on the boss portion 16A of the rotating arm 16 and projects forward, and a support plate 17, which will be described later, is fixedly provided on the bracket 16C. (See Figure 2).

Reference numeral 17 indicates a support plate formed into a substantially rectangular shape by a thin metal plate or the like, and as shown in FIGS. 2 and 3, the support plate 17 has a length of 370 mm and a width of 18 mm, for example.
0 am and a thickness of about 5 mm, and a short mounting plate 18 is integrally provided at one end in the longitudinal direction using means such as welding. The mounting plate 18 is fixed onto the platen 16C of the rotating arm 16 with butterfly bolts (not shown), and thereby the support plate 17
is rotatably attached to the support shaft 15 via the boss portion 16A of the rotary arm 16. Thus, the support plate 17
is arranged on the upper side of the liquid tank 12 as shown in Fig. f51, and when the rotating arm 16 is rotated in the direction of arrow B,
It is rotated in the direction of arrow C and immersed in the test liquid 13.

19.19. ... indicates punched holes located on both sides of the support plate 17 in the width direction and arranged in a row in the longitudinal direction of the support plate 17, and each of the punched holes 19 is, for example, as shown in the figure on page 53. A total of 8 holes are drilled at a distance of about 20 mm from both side edges of the support plate 17 and 4 holes at a distance of about 80 mm from each other in the longitudinal direction, and the diameter thereof is about 24 to 25 mm and is formed in a circular shape. There is. Each of the holes 19 is connected to the support plate 17.
When submerged in the test liquid 13 together with the pump casing A etc., the support plate 17 acts to release surrounding air from the lower surface side of the support plate 17, thereby suppressing the generation of bubbles in the test liquid 13. ing.

20 is located between each punched hole 19 on both sides of the support plate 17,
A clamp means provided on the support plate 17 is shown, and the clamp means 20 includes a rectangular fixing plate 21 fixed to the center of the support plate 17 using means such as screws, and Fixed side clamping plate 2 erected on the longitudinal direction-end side
2, a movable-side clamping plate 23 that clamps the pump casing A between the clamping plate 22, and the clamping plate 23.
．． A holding member 24 is provided on the fixed plate 21 between 22 and holds the outer peripheral surface side of the pump casing A, and a holding member 24 is provided on the other end of the fixed plate 21 in the longitudinal direction and supports the bracket 25. a lever 27 which is pivotally supported by the pedestal 26 and is rotatably operated to displace the movable side clamping plate 23 in the direction of arrow E; and the bracket 25.
It slides in the E direction as shown by the arrow in the guide 25A provided at
Rods 29 connected via shape links 28.28
and a clamping plate 22. made of an elastic material such as rubber.
23, and plug bodies 30 and 31 fixed to each other,
The plug body 31, for example, closes the discharge port 6 of the pump casing A in an air-liquid tight manner, and the plug body 30 closes the suction port 5 in the insertion hole 30A.
The suction port 5 is sealed against the outside in an air-liquid tight manner.

A communication hole 22A that communicates with the insertion hole 30A is bored in the clamping plate 22 on the fixed side, and a hose 34, which will be described later, is connected to the communication hole 22A. Pressurized air is supplied from the 6 side.

Here, the fixed plate 21 has a length of 1, for example, a length of 250+*
It is formed of a metal plate or the like with a width of 50 mm and a thickness of about 10 mm.
3. The holding member 24 and the pedestal 26 are connected to screws 32 and 26, respectively.
32. It is fixed by...

Next, 33 indicates a pressurized air source installed in the lower part of the rear chamber 11B of the housing 11 via a vibration-proof rubber etc. The pressurized air source 33 consists of an air compressor etc., and one end of a hose 34 is connected to the discharge side of the air compressor. It is connected. The other end of the hose 34 is connected to the communication hole 22A of the holding plate 22, and a bellows portion 34A is provided in the middle of the hose 34 to follow the rotation of the support plate 17 and the like. The pressurized air source 33 enters the suction port 5 into the pump casing A via the hose 34, the communication hole 22A, etc.
Pressurized air is supplied from the side.

Furthermore, 35 indicates an air cylinder as an actuator that rotates the support plate 17 in the direction of arrow C via the rotation arm 16, and the head side 35A of the air cylinder 35 can rotate toward the front side of the upper part of the rear chamber. The rod side 35B is rotatably connected to the boss portion 16B of the rotary arm 16. Further, the air cylinder 35 is connected to a pressurized air source 33 via a hose (not shown) or the like, and is expanded and contracted by pressurized air from the pressurized air source. When the air cylinder 35 is contracted, the rotating arm 16 rotates in the direction of arrow B, and in response, the support plate 17 and the pumping means 20 rotate together with the pump casing A in the direction of arrow C. The specimen is moved and immersed in the test liquid 13 in the liquid tank 12.

The airtightness inspection device according to this embodiment has the above-mentioned configuration, and its operation will be explained first.

First, the air cylinder 35 is extended and the support plate 17 is placed in an atmospheric position above the liquid tank 12 as shown by the solid line in FIG. 22.23 The pump casing A is held between The support plate 17 and the clamping means 20 are rotated in the direction shown C, and the support plate 17 and the clamping means 20 are moved together with the pump casing A into the liquid tank 12.
immersed in the test liquid 13. The time during this time may be about 3 to 5 seconds, and each punched hole 19 is provided on both sides of the support plate 17 in the width direction.
are arranged in a row, so the support plate 1 is
The surrounding air can be effectively released upward from the lower surface side of the test liquid 13, and the generation of bubbles and the like in the test liquid 13 can be reliably suppressed.

In addition, since the air cylinder 35 is contracted at a constant speed, when the support plate 17 and the like are immersed in the test liquid 13, there is no variation in the impact of S, and this also makes it possible to suppress the generation of bubbles and the like. can.

Then, pressurized air from the pressurized air source 33 is supplied into the pump casing A through the hose 34, etc., and the inside of the pump casing A is pressurized, so that the test liquid 13 is
Inspect the airtightness of the pump casing by visually checking whether air bubbles are generated inside. At this time, the liquid tank 12 is made of transparent tempered glass, and each fluorescent lamp 14 is visible from below.
Since the test liquid 13 is illuminated by a light source, the presence or absence of bubbles in the test liquid 13 can be easily visually confirmed, and the airtightness test can be continued satisfactorily. Thus, after the test, the air cylinder 35 can be extended again and the next test can be continued one after another.

Therefore, according to this embodiment, the air cylinder 35 is expanded and contracted at a constant speed to immerse the support plate 17, pump casing A, etc. in the test liquid, and the support plate 17 is positioned on both sides. Since each punched hole 19 is arranged in a row, the generation of bubbles etc. during immersion can be greatly suppressed, and unlike conventional technology, there is no need to wait for inspection for 30 to 60 seconds for bubbles to disappear. As a result, inspection time can be significantly shortened. In addition, since the generation of bubbles etc. during immersion can be greatly suppressed, pressurized air can be supplied into the pump casing A before submerging the pump casing A etc. in the test liquid 13. Furthermore, the inspection time can be shortened.

In the above embodiments, the case where the pump casing A was used as the workpiece was explained as an example, but the present invention is not limited to this, and can be applied to various parts that require air-liquid tightness, such as filter casings. etc. can be used as a workpiece for inspection.

Further, as the actuator, a hydraulic cylinder, a rotary type actuator, or the like may be used in addition to the air cylinder 35.

〔Effect of the invention〕

As detailed above, according to the present invention, a plurality of punched holes are arranged in a row on both sides in the width direction of a support plate, and an object to be tested for airtightness is clamped on the support plate via a clamping means. These are rotated by an actuator and immersed in the test liquid, and pressurized gas is supplied from a pressurized air source through a hose into the object to be tested for airtightness. In addition to being able to be immersed in the test liquid together with the clamping means at a constant speed using an actuator, the punched holes in the support plate can reliably suppress the generation of bubbles during submersion, reducing the test time. It can be significantly shortened.

[Brief explanation of the drawing]

Figures 1 to 4 show embodiments of the present invention, Figure 1 is a partially cutaway overall view of the airtightness inspection device, and Figure 2 is an enlarged view of the support plate, clamping means, etc. in Figure 1. 3 is a plan view of FIG. 2, FIG. 4 is a sectional view taken along arrow IV-IV in FIG. 2, and FIG. It is a front view. 11...Housing, IIA...Front room, IIB...
・Rear chamber, 12...Liquid tank, 13...Test liquid, 15.
... Support shaft, 16... Rotating arm, 17... Support plate, 19... Punching hole, 20... Clamping means, 21...
...Fixing plate, 22.23... Holding plate, 24... Holding member, 25... Bracket, 26... Pedestal, 27.
... Lever, 30° 31 ... Plug body, 30A ... Insertion hole, 33 ... Pressure source, 34 ... Hose, 35 ...
Air cylinder, A...Pump casing (object to be tested for airtightness). Patent Applicant Japan Electronics Co., Ltd. Agent Patent Attorney Kazuhiko Hirose
Naoki MuraFigure 1Figure 4Figure 5

Claims (1)

[Claims] A liquid tank having an open upper side and containing a test liquid therein; a thin plate-shaped support plate having one longitudinal end attached to a support shaft and rotatably arranged on the upper side of the liquid tank; and the support plate. A plurality of punched holes located on both sides in the width direction of the plate and arranged in a row in the longitudinal direction of the support plate, and a plurality of punched holes provided on the support plate located between the punched holes on both sides, and an airtight inspection hole. clamping means for clamping the object; a hose having one end connected to a pressure air source and the other end connected to the clamping means for supplying pressurized gas into the object; and the support plate and the clamping means. An airtightness testing device comprising an actuator that rotates the support plate so as to immerse the object to be tested together with the test liquid in the liquid tank.