JPS625144A - Leak tester - Google Patents

Abstract

PURPOSE:To elevate the workability, by making pressure jigs for seal closing the opening of an object to be inspected automatically exchangeable to allow a seal closure of the opening quickly without requiring labor regardless even for a plurality of objects being inspected different in the shape of a seal surface. CONSTITUTION:A plurality of pressure jigs 23-28 for the seal closure of the opening of an object W to be inspected such as cylinder head are held with a second loading/unloading mechanism at dummy members 47 and 48 while not used and hence, located at the retreat position. When inspecting the object W being inspected different in the shape of a seal surface, a plurality of pressure jigs 23 (23')-28 (28') which has a pressure section for seal closure of the opening of each object W being inspected are given and taken with a first loading/ unloading mechanism and a second loading/unloading mechanism between the plurality of dummy members 47 set in the shape corresponding to the outline of each object W being inspected and pressure units 10-15. The exchange of the pressure jigs 23-28 is automated, thereby elevating the leak inspection workability.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a leak test device that can efficiently perform leak test work on a plurality of test objects having different seal surface shapes.

(Prior Art) Conventionally, for example, when performing a leak test on a cylinder head of an automobile engine, a jig is used to press each opening of a cavity formed in the cylinder head that opens to the outside, such as an oil way, a water jacket, or a locker room. Gas is sealed in the cavity and the leakage of the sealed gas is detected.

(Problems to be Solved by the Invention) By the way, in the above-mentioned conventional method, when a plurality of objects to be tested with different seal surface shapes are successively leak tested, the pressing jig must be replaced each time the seal surface shapes are different. There is a need. However, since this replacement work is usually performed manually each time, there is a problem that the replacement work takes a long time and is inefficient.

The present invention has been made in view of the above points, and its purpose is to automatically replace a pressing jig for sealing and closing an opening of an object to be inspected, thereby making it possible to automatically replace a plurality of pressing jigs with different sealing surface shapes. To improve leakage detection workability by quickly sealing and closing an opening of an object to be inspected without bothering human hands.

(Means for Solving the Problems) In order to achieve the above object, the solving means of the present invention seals each frontage of a plurality of test objects having a cavity opening to the outside and having different seal surface shapes. A leak test device for detecting leakage of gas sealed in a cavity includes a plurality of pressing parts/tools each having a pressing part that seals and closes the frontage of each of the objects to be tested, and a seal for each of the objects to be tested. a plurality of press units arranged corresponding to the surfaces and for pressing each of the pressing jigs against the sealing surface of the object to be inspected; and a first attachment/detachment unit for allowing each of the pressing units to removably hold each of the above-mentioned pressing jigs. a mechanism, further comprising a plurality of dummy members set in a shape corresponding to the road contour of each of the objects to be inspected, and a moving means for moving each of the dummy members between a measurement position and a retreat position; A second attachment/detachment mechanism is provided on each of the dummy members to detachably hold each pressing jig.

(Function) With the above configuration, in the present invention, the plurality of pressing jigs having pressing portions for sealing and closing the frontage of the object to be inspected are held by the dummy member by the 21st removal mechanism when not in use, and are in the retracted position. positioned. When in use, the dummy member is moved to the measurement position by the moving means, and each pressing jig held by the dummy member is held by the plurality of pressing units by the holding operation of the first attachment/detachment mechanism, and the twenty-first detachment mechanism is held by the plurality of pressing units. Each pressing jig is separated from the dummy member by the release operation, and each pressing jig is pressed against the sealing surface of the object to be inspected using each pressing unit to seal gas in the cavity of the object to be inspected and perform a leak test. .

On the other hand, after the leak test is completed, each of the pressing jigs held in the respective suppression units is held by the dummy member by the holding operation of the second attachment/detachment mechanism, and each pressing jig is held by the dummy member by the release operation of the first attachment/detachment mechanism. The dummy members (each pressing jig) are removed from the respective pressing units, and the dummy members (each pressing jig) are retracted from the measurement position to the retracted position by the moving means. This results in
Even for multiple test objects with different seal surface shapes, the first attachment/detachment mechanism and the 21182nd mechanism can be attached and detached without the need for manual labor (each pressing jig can be automatically replaced according to changes in the seal surface). This makes it possible to shorten the replacement work and improve leak detection work efficiency.

(Example) Embodiments of the present invention will be described below based on the drawings.

Figures 1 to 3 show leak test results according to embodiments of the present invention. ~The device is shown, 1 is a base horizontally supported at a predetermined height position above the floor 3 by a plurality of supporting legs 2, 2°...
A plurality of rollers 5, 5 4 are disposed on the upper right side of the base 1, and carry an object W to be inspected (for example, a cylinder head of an automobile engine, etc.) having a cavity opening to the outside to the inspection position.
．． A plurality of rollers 7.7 for carrying out the inspected object W after the inspection is completed. The carry-in conveyor 4 and the carry-out conveyor 6 each have rollers 5 and 7 rotationally driven by a drive source 8.9 such as an electric motor.

Further, reference numerals 10 to 15 denote a plurality of (six) pressing units arranged corresponding to the sealing surface of the object W to be inspected, and the pressing units 10 to 15 press each sealing side surface of the object W to be inspected.
13 are disposed on the left and right and front and rear positions of the base 1, and a pressing unit 14 for pressing the upper surface of the seal of the object W to be inspected is disposed above the base 1. A pressing unit 15 for pressing the lower surface of the seal is disposed below the base 1. As shown in detail in FIGS. 4 and 5, each of these pressing units 10 to 15 includes a fluid pressure cylinder 17 having a suppression plate 16 connected to the tip of a piston rod 17a, and a fluid pressure cylinder 17 on both sides of the fluid pressure cylinder 17. Pressing units 10 to 10 are equipped with a guide cylinder 18 and press each seal side surface of the object W to be inspected.
13, the fluid cylinders 17 are horizontally supported by a mounting frame 19 fixed to the base 1 with the tips of the piston rods 17a facing inward. In addition, the object to be inspected W
In the pressing unit 14 that presses the upper surface of the seal, the fluid pressure cylinder 17 has a plurality of (four) pillars 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, etc. ...Thus, the piston rod 17a is supported by the horizontally supported top plate member 21 with its tip facing downward.

Further, in the pressing unit 15 that presses the lower surface of the seal of the object W to be inspected, the fluid pressure cylinder 17 is supported at a position below the base 1 via the mounting plate 22 with the tip of the piston rod 17a facing upward. .

Furthermore, 23 to 28 are each of the above-mentioned pressing units 10
- 15 are six pressing jigs detachably held by a first attachment/detachment mechanism 29, and each of the pressing jigs 23 to 28 has an opening of the object W carried into the inspection position. A suppressing portion 3o for sealing and closing is provided protruding from one side, and engaging protrusions 31 are provided opposingly protruding from both surfaces.

Specifically, as shown in FIG. 6 in detail, the first detachment mechanism 29 has its distal end fitted into the pressing plate 16 of each of the pressing units 10 to 15, and its inner peripheral surface on the distal end side is slightly enlarged. A cylinder 32 whose diameter is set to a certain diameter, a cylinder 33 that is attached to the rear end of the cylinder 32 and has a piston rod 33a located corresponding to the axis position within the cylinder 32, and a cylinder 33 that is fitted into the cylinder 32. equipped,
The bottom surface is connected to the tip of the piston rod 33a of the cylinder 33, and is moved in the axial direction within the cylinder 32 by the expansion and contraction operation of the cylinder 33. Sliding body 35 with blind hole 34
and a plurality of holes 36,36. A plurality of balls 37, 37. It consists of...

Then, the engaging protrusion 31 of each of the pressing jigs 23 to 28 is provided.
One of the balls 31 is fitted into the blind hole 34 of the sliding body 35 with the cylinder 33 being extended, and then the cylinder 33 is contracted to make each ball 37 protrude into the blind hole 34 and engage the engaging protrusion 31. The pressing jigs 23 to 28 are held by the respective pressing units 10 to 15 by engaging with the bulging portions 31'a.

In addition, among the above-mentioned respective suppression units 10 to 15, the press plates 16 of some press units corresponding to mutually independent air conditioning of the inspected object W are supplied with nozzles 38 from a gas supply source (not shown).
A supply port 39 is opened for supplying the gas supplied through the test object W to the cavity of the object W to be inspected. The supply port 39 is connected to the pressing part 30 of each pressing jig 23 to 28.
It communicates with a supply passage 40 provided through the. Further, a nozzle 41 is attached to the circumferential surface of the cylindrical body 32 of the first attachment/detachment mechanism 29 to eject air into the sliding body 35 through the small holes 42J. A linear force is ejected from the portion 44 toward the pressing jigs 23 to 28, thereby removing dust and the like that may impede attachment/detachment operations. Further, each of the pressing jigs 23 to 28 has a positioning rod 45 protrudingly provided, the tip of which abuts and engages with a protrusion 68 of a dummy member 47, which will be described later, to maintain a normal posture. There is. Further, 46 is an O-ring provided around the supply port 39 of the press plate 16.

Further, 47 is a dummy member set in a shape corresponding to the outer shape of the object W to be inspected, and 48 is a dummy member set in a shape corresponding to the outer shape of the object to be inspected, which has a seal surface shape different from that of the object W to be inspected. These dummy members 47.
48 is moved between the above-mentioned inspection position and the retreat position by four moving means. Specifically, the moving means 49 includes a cylindrical member 50 erected on the right side of the base 1, and a rotating shaft 51 is fitted into the cylindrical member 50 so as to be rotatable around the axis. The lower ends of the pair of guide column members 52, 52 are connected to the upper end of the rotation shaft 51 via a support plate 53. Each guide column member 52 is fitted into a hole 56 penetrating in the vertical direction of a pair of sliding cylinders 55 provided in the frame member 54, and the frame member 54 is raised and lowered by the operation of an unillustrated lifting drive source. It is designed to move. Furthermore, the frame member 54 includes a fluid pressure cylinder 57 having a piston rod 57a that extends and retractably extends in the horizontal direction, and guides that are provided on both sides of the fluid pressure cylinder 57 and extend and retract in the same direction as the piston rod 57a. Two guide cylinders 11 each having a pair of guide cylinders 58 and 58 each having a rod 58a are arranged so as to extend and contract in the right angle direction. The dummy members 47 and 48 are fixed to the front end of each of the rods 57a and 58a.

On the other hand, one end of an operating rod 59 is connected to the lower end of the rotation shaft 51, and the other end of the operating rod 59 is a horizontally extending piston rod of a swing cylinder 60 disposed below the base 1. The frame member 54 is pivotally attached to the tip of the frame member 60a.
is rotated by the expansion and contraction operation of the swing cylinder 60.

That is, each of the dummy members 47 and 48 is moved up and down and rotated by the operation of the lift drive source and the swing cylinder 60, and is also moved forward and backward by the operation of the fluid pressure cylinder 57. .

In addition, each of the pressing jigs 23 to 23 is attached to the one dummy member 47.
A second attachment/detachment mechanism 61 is provided to detachably hold 28. This second attachment/detachment mechanism 61 is the first attachment/detachment mechanism 29
(In the drawings, the same constituent parts are given the same reference numerals and their explanations are omitted.), and each of the pressing jigs 23-
The bulging part 31 of the engagement protrusion 31 protruding from the other side of 28
The ball 37 is engaged with the dummy member 47 to hold each pressing jig. On the other hand, the other dummy member 48 is also provided with a second attachment/detachment mechanism 61,
Each of the pressing jigs 23' to 2 seals and closes the openings of the test object with different seal surface shapes using the second attachment/detachment mechanism 61.
8' is retained. Then, each of the above-mentioned pressing jigs 23
(23') to 28 (28') are respectively moving means 49
The receiver is moved from the retreat position to the inspection position by the operation of , and the receiver is passed to each of the suppression units 10 to 15 to perform a leak test on the object W to be inspected. In addition, after the leak test is completed, the receiver is passed to each dummy member 47, 48.

The pressing jig 28 (28') that presses the lower surface of the seal of the object W to be inspected includes a support frame 63 on which a plurality of rollers 62, 62, etc. are rotatably attached along the transport direction.
are provided on both sides in the conveyance direction in a state where they are urged upward by coil springs 64. That is, this pressing jig 28 (28') carries in the inspected object W transported by the carry-in conveyor 4 to the inspection position, and carries out the inspected object W, which has not been inspected, to the carry-out conveyor 6. It also has functions.

Further, on one side of the above-mentioned carry-out conveyor 6, there is disposed a carry-out cylinder 65 for carrying out the defective inspected object W in which gas leakage has occurred during inspection from the regular carry-out route to another route. By extending the carrying-out cylinder 65, the defective inspection object W is carried out to a carrying-out chute 66 provided on the other side of the carrying-out conveyor 6. Furthermore, a marking cylinder (not shown) is provided on the carrying-out shoe 1-66 side of the carrying-out conveyor A76 to mark a defective object to be inspected that has gas leakage. Further, the carry-in conveyor 4 is provided with a carry-in chute 67 for carrying the inspected object W carried out from the carry-out chute 66 and repaired to an inspection position for re-inspection.

Next, an example of how the leak test device of the above embodiment is used will be explained.

(1) First, each of the pressing units 10 to 14 except the pressing unit 15 that presses the lower surface of the seal of the object to be inspected (cylinder head) W is moved to the position shown in FIGS. 4 and 5 by the contraction operation of each fluid pressure cylinder 17. Regress as shown by the solid line. In this state, the swing cylinder 60 of the moving means 49 is contracted to move the dummy member 47, which has a shape corresponding to the outer shape of the object W to be inspected, from the retracted position to the inspection position. Thereafter, the fluid pressure cylinder 57 is expanded to move the dummy member 47 above the measurement position.

At this time, the dummy member 47 has six pressing jigs 23 each having a suppressing part 30 for sealing and closing the opening of the object W to be inspected.
- 28 are each detachably held by a second attachment/detachment mechanism 61.

(2) Thereafter, the four lifting drive sources of the moving means are operated downward to move the engagement protrusion 31 of the pressing jig 28 into the sliding hole 34 provided in the pressing plate 16 of the pressing unit 15 (635).
When the cylinder 33 is contracted, the ball 37 is engaged with the bulge 31a of the engagement protrusion 31. That is, the pressing jig 28 is held on the suppression unit 15 by the first attachment/detachment mechanism 29.

(3) Next, the fluid pressure cylinder 17 of the pressing unit 1-15 is contracted to place the gummy member 47 at the measurement position, and then each of the other pressing units 10-1
The fluid pressure cylinders 17 of No. 4 are extended and the respective pressing jigs 23 are removed by the first attachment/detachment mechanism 29 in the same manner as described above (25).
-27 are held in the pressing units 10-14.

(4) Thereafter, the cylinder 33 of each second @removal mechanism 61 is operated to extend to release the engagement state of the engagement protrusion 31 by the ball 37, and each of the other pressing units 10 except the lower pressing unit 15 -14 pressure plates 16 are again retracted to the 1 position indicated by the solid line. Then, the elevating drive source of the moving means 49 is raised and the fluid pressure cylinder 57 is contracted to retract the dummy member 47 as shown by the solid line in FIG.

(S Next, after the fluid pressure cylinder 17 of the lower pressing unit 15 is extended and the pressing plate 16 is raised, the object W to be inspected is carried onto the pressing plate 16 from the carrying-in conveyor 4.

Then, after the fluid pressure cylinder 17 of the lower pressing unit 15 is expanded and contracted again to place the inspected object W at the measurement position, the fluid pressure cylinder 17 of the other pressing units 10 to 14 is
is extended and the openings of the cavities (oil way, water jacket, locker room, etc.) of the object W to be inspected are sealed and closed using the respective pressing jigs 23 to 28 (see FIGS. 1 to 3). In this state, the supply port 39 of each press plate 16 and the supply passage 40 of each press jig 23 to 28 are in communication, and the gas supplied from each press unit 10 to 15 is in the cavity of the object W to be inspected. is sealed and a leak test is performed.

(6) As a result of the leak test, non-defective products with no gas leak detected are guided to the carry-out conveyor 6 and carried out to the outside, but defective test items W with gas leak detected are stamped by the operation of the stamp cylinder. , and is carried out to the carry-out chute 66 by the extension operation of the carry-out cylinder 65, and after repairing defective parts, is carried into the carry-in conveyor 4 through the carry-in shoe 1-67, and is again inspected.

(7) By repeating the above-mentioned operations, the leak test of the inspected object W is performed continuously. However, when inspecting an inspected object with a different seal surface shape, the above-mentioned operation is reversed. The press jigs 23 to 28 are transferred between the dummy member 47 and each of the press units 10 to 15 by the first attachment/detachment mechanism 29 and the second attachment/detachment mechanism 61, and then the external shape of the object to be inspected is adjusted. Dummy member 48 set to a corresponding shape
is moved from the retracted position to the measurement position by the same operation as in (1) above, and thereafter, by the same operation, each of the pressing jigs 23' to 28' held by the dummy member 48 is moved to the first position. Mechanism 29
The second attachment/detachment mechanism 61 transfers the dummy member 48 and each of the suppression units 10 to 15 to perform a leak test on the object to be inspected.

Therefore, in the leak test device of the above embodiment, when performing a leak test on a plurality of test objects W having different seal surface shapes, a plurality of Pressing jig 23 (23') ~
28 (28'), a plurality of dummy members 47, 48 set in a shape corresponding to the outer shape of each object W to be inspected, and a plurality of pressing units 10 to 10 for supplying gas to the cavity of the object W to be inspected.
15 and the first attachment/detachment mechanism 29 and the second attachment/detachment mechanism 61, each of the above-mentioned pressing jigs 23
The replacement of (23') to 28 (28') is automated, and the opening of each inspected object W can be quickly sealed and closed without bothering human hands, thereby improving the workability of leak detection. I can do it.

(Effects of the Invention) As explained above, according to the leakage device 1 of the present invention, the first and second detachment mechanisms and the second attachment and detachment mechanism allow the plurality of pressing jigs to be detachably held on the dummy member and the pressing unit. This allows for quick and automatic replacement of a pressing jig suitable for closing the openings of multiple objects to be inspected with different seal surface shapes to the pressing unit, thereby preventing leaks. It is possible to improve the inspection work efficiency.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIGS. 1 to 3 are a front view, a top view, and a side view showing leak test conditions, and FIGS. 4 to 6 show a pressing jig held on a dummy member, respectively. FIG. 2 is an enlarged plan view, an enlarged side view, and an enlarged plan view of main parts, showing a state in which the device is in a closed state. 10-15...Press unit, 23 (23')
~28 (28”)...Press jig, 29...1st M
Detachment mechanism, 30...Press portion, 47.48...Dummy member, four...Movement means, 61...Second attachment/detachment mechanism, W
...Object to be inspected.

Claims (1)

[Claims] (1) A leak test device that has a cavity that opens to the outside and that seals and closes each opening of a plurality of test objects with different seal surface shapes to measure the leakage of gas sealed in the cavity, A plurality of pressing jigs each having a pressing part for sealing and closing the opening of each of the objects to be inspected; a first attachment/detachment mechanism that allows each of the pressing units to detachably hold each of the pressing jigs, and a plurality of dummies set in a shape corresponding to the road contour of each of the objects to be inspected. A member, a moving means for moving each of the dummy members between a measurement position and a retreat position, and a second attachment/detachment mechanism for detachably holding each pressing jig on each of the dummy members. Leak test equipment.