JP3036203B2 - Work leak inspection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leak inspection apparatus for inspecting sheet surfaces formed at both ends of a cylindrical work for leaks.

[0002]

2. Description of the Related Art In general, for example, when a piston for a shock absorber is formed by sintering, it is inspected whether or not a defect such as a dent or a chip is formed on a sheet surface formed at both ends of the piston. doing. In this case, the airtightness is provided between the two seat surfaces of the piston, pressurized air is supplied into the sealed space, and the quality of the product is determined based on whether or not the air leaks out.

[0003]

In the above-described conventional apparatus for inspecting both sheet surfaces of a work, dedicated inspection apparatuses are individually prepared according to the shape and size of the work. When the inspection device is exchanged according to various works, there is a problem that the exchange operation requires time.

The present invention has been made in view of the above circumstances, and an object of the present invention is to perform a smooth and reliable inspection of sheet surfaces formed on both ends of a work having various shapes and dimensions. Leak inspection of workpieces that can reliably sort out products of good quality, simplify equipment replacement work for various workpieces, and reduce setup time It is to provide a device.

[0005]

In order to achieve the above object, the present invention relates to a leak inspection apparatus for inspecting sheet surfaces formed at both ends of a cylindrical work, in a leak inspection device, which is provided at an intermediate portion of a support member. A housing portion for housing the work is provided, and a first valve body is provided at one end of the housing portion.
The second valve body is provided in a state of being urged toward the housing portion by the first spring, and is urged toward the other end of the housing portion in a direction away from the housing portion by the second spring. And a fluid passage for supplying a pressurized fluid into the work is provided in the valve body, and the support member moves the second valve body toward and away from the housing. The moving mechanism is detachably provided.

[0006]

According to the work leak inspection apparatus of the present invention,
After the supporting member corresponding to one work is detachably connected to the moving mechanism, the work is housed in the housing of the supporting member, and the moving mechanism causes the second valve body to oppose the second spring. A pressurized fluid is supplied into the work via the fluid passage of the valve body while the work is pressed between the first and second valve bodies while being pressed against the work in the storage section. The presence or absence of leakage is detected.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, reference numeral 1 denotes a cylindrical support cylinder, and an accommodation portion 2 for accommodating a work W is formed in an intermediate portion of the support cylinder 1. And this work W
Is formed in a cylindrical shape with a bottom, a central hole WA is formed in a bottom portion, and an annular projection WB is formed in a bottom surface, while an upper surface WC and a lower surface WD of the projection WB are sheet surfaces, respectively. Things. Inside the lower part of the support cylinder 1, a hollow first valve body 3 has an upper surface 3a.
Is provided so as to be movable within a range that does not protrude toward the accommodation unit 2 side,
A first spring 5 for urging the first valve body 3 toward the housing 2 is mounted between the lid 4 for closing the lower end of the support cylinder 1 and the first valve body 3. Have been.
The lower portion of the first valve body 3 has the lid 4.
And a fluid passage 6 for pressurized air is formed inside the first valve body 3. Further, a hollow second valve body 7 is provided inside the upper part of the support cylinder 1 so that its lower surface 7a can be protruded and retracted toward the housing portion 2 side, and a flange portion of the second valve body 7 7
Below b, a second spring 8 for urging the second valve body 7 upward is mounted. A guide ring 10 for restricting upward movement of the second valve body 7 is provided between the flange 7b of the second valve body 7 and the lid 9 for closing the upper end of the support cylinder 1. Is installed. Furthermore, a guide rod 11 formed by reducing the diameter in two stages is provided movably up and down through the inside of the lid 9, the guide ring 10, and each of the second valve bodies 7. The upper part of the fluid passage 6 in the first valve body 3
The diameter of the guide rod 11 is enlarged so as to be able to accommodate the distal end. An O-ring 12 is mounted between the upper surface of the second valve body 7 and the first step of the guide rod 11. The guide rod 11
A piston rod of an air cylinder 13 for crimping is provided on the upper surface of the air cylinder 13 so as to be able to freely contact and separate therefrom. An engagement pin 15 connected to the tip of the rod is provided detachably. Each of the air cylinders 13 and 14 is fixed at a predetermined position, and the unitized support cylinder 1 and guide rod 11 (unit unit U) are exchanged according to the shape and size of the work W. It has become so. In addition, a proximity sensor 16 that detects the presence or absence of the work W is mounted on the support cylinder 1 so as to face the storage unit 2.

When inspecting the seat surfaces WC and WD of the work W using the leak inspection apparatus configured as described above, the work W is placed on the upper surface 3a of the first valve body 3 in the housing portion 2. The first valve body 3 has its center hole WA aligned with the center thereof. In this state, the guide rod 11 is lowered by lowering the piston rod of the air cylinder 13 and pressing the upper surface of the guide rod 11. At this time, the return air cylinder 14 is kept free. Thereby, the tip of the guide rod 11 reaches the inside of the fluid passage 6 of the first valve body 3 through the center hole WA of the work W, and the guide rod 11 is The second valve body 7 is pressed to lower the second valve body 7 against the second spring 8. As a result, the upper surface WC of the work W in the storage section 2 is pressed downward by the lower surface 7a of the second valve body 7, and therefore, the lower surface WD of the work W pushes the first valve body 3 to the first valve body 3. By pressing slightly downward against the spring 5, the work W
Is firmly sandwiched between the valve bodies 3 and 7. At this time, the O-ring 1 attached between the upper surface of the second valve body 7 and the first step portion of the guide rod 11
2 is deformed by being pressed between the two. Thus, when air is supplied to the fluid passage 6, the O-ring 1 is provided between the upper surface of the second valve body 7 and the first step portion of the guide rod 11.
2, the air does not leak.

In this state, air is supplied to the fluid passage 6 to apply a predetermined pressure to the inside of the work W. in this case,
If both sheet surfaces WC and WD of the work W are in a favorable state, air does not leak out. On the other hand, if any of the sheet surfaces WC, WD of the work W has an abnormality, air leaks from the sheet surface WC, WD having the abnormality to the outside, so that a pressure drop due to the air leakage is detected. By doing, the sheet surface W of the work W
Good and bad C and WD can be determined. When the inspection of one work W is completed in this way, the piston rod of the air cylinder 13 is raised, and the piston rod of the return air cylinder 14 is operated to lift the guide rod 11 and the second rod is moved. The valve body 7 is raised by the second spring 8. As a result, the work W firmly sandwiched between the two valve bodies 3 and 7 is released. The work W is taken out of the storage section 2 and the next work W is placed in the storage section 2. When inspecting a workpiece W having a different shape and size from the workpiece W which has been inspected up to now, the engaging pin 15 is
1 from the locking holes 11a.
After releasing the engagement state between the support tube 1 and the guide rod 11 and the like unitized, the unit portion U
Can be replaced.

[0011]

As described above, the present invention relates to a leak inspection device for inspecting a sheet surface formed at both ends of a cylindrical work for leaks. A first valve body is provided on one end side of the housing portion in a state where the first valve body is biased toward the housing portion side by a first spring, and a second valve body is provided on the other end side of the housing portion. The valve body is provided in a state of being urged away from the housing portion by a second spring, and the valve body is provided with a fluid passage for supplying a pressurized fluid into the work. For the support member,
Since the moving mechanism for moving the second valve body toward and away from the housing portion is provided detachably, 1
After the support member corresponding to the two works is detachably connected to the moving mechanism, the work is stored in the storage section of the support member,
With the moving mechanism, the second valve body is pressed against the work of the storage part against the second spring, and the work is pressed between the first and second valve bodies. Supply pressurized fluid into the work through
In addition to detecting the presence or absence of leakage of the pressurized fluid, for works of different shapes and dimensions, by removing the unit part for each support member from the moving mechanism and replacing it, both ends of the works of various shapes and dimensions are respectively Inspection of the formed sheet surface can be performed smoothly and reliably, products of good quality can be reliably selected, and replacement work of the apparatus performed for various works can be simplified. As a result, the setup time can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention.

[Explanation of symbols]

 W Workpiece (piston) WC Upper surface (seat surface) WD Lower surface (seat surface) U Unit 1 Supporting cylinder (supporting member) 2 Housing 3 First valve body 5 First spring 6 Fluid passage 7 Second valve body 8 Second spring 13 Air cylinder for crimping (moving mechanism) 14 Air cylinder for returning (moving mechanism)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-105203 (JP, A) JP-A 64-83131 (JP, A) JP-A 62-5144 (JP, A) 130209 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01B 13/00-13/24 G01M 3/00-3/40

Claims (1)

(57) [Claims] In a leak inspection apparatus for inspecting a sheet surface formed at both ends of a cylindrical work, a housing for housing the work is provided at an intermediate portion of a support member, and one end of the housing is provided. On the side, the first valve body,
The second valve body is provided in a state of being urged toward the housing portion by the first spring, and is urged toward the other end of the housing portion in a direction away from the housing portion by the second spring. And a fluid passage for supplying a pressurized fluid into the work is provided in the valve body, and the support member moves the second valve body toward and away from the housing. A leak inspection device for a work, wherein a moving mechanism is detachably provided.