JPH0213253B2 - - Google Patents

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, when performing a leak test on a cylinder head of an automobile engine, for example, a jig is used to press each opening of a cavity that opens to the outside, such as an oil way, a water jacket, or a rocker room, formed in the cylinder head. 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 done manually each time,
There was a problem that the replacement work took a long time and was 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 problem) In order to achieve the above object, the solving means of the present invention seals and closes each opening of a plurality of objects to be inspected that have cavities that open to the outside and have different seal surface shapes. A plurality of pressing jigs each having a pressing part for sealing and closing an opening of each object to be inspected as a leak test device for detecting leakage of gas sealed in a cavity;
arranged corresponding to the sealing surface of each of the above-mentioned objects to be inspected,
A plurality of pressing units are provided for pressing each of the pressing jigs against the sealing surface of the object to be inspected, and a first attachment/detachment mechanism is provided for each of the pressing units to detachably hold each of the pressing jigs. A plurality of dummy members set in a shape corresponding to approximately the outer shape of the inspection object, a moving means for moving each of the dummy members between a measurement position and a retreat position, and a pressing jig attached to each of the dummy members. The mechanism is provided with a second attachment/detachment mechanism for detachably holding the device.

(Function) With the above configuration, in the present invention, the plurality of pressing jigs having pressing parts that seal and close the opening of the object to be inspected are held by the second attachment/detachment mechanism on the dummy member and retracted when not in use. Located in position. When in use, the dummy member is moved to the measurement position by the moving means, and each of the pressing jigs held by the dummy member is held by the plurality of pressing units by the holding operation of the first attachment/detachment mechanism. Each pressing jig is released from the dummy member by the release operation of the second attachment/detachment mechanism, and each pressing unit presses each of the pressing jigs against the sealing surface of the object to be inspected to inject gas into the cavity of the object to be inspected. Enclose it and perform a leak test. On the other hand, after the leak test is completed, the pressing jigs held in the pressing units are held on the dummy member by the holding operation of the second attaching/detaching mechanism, and each pressing jig is held by the dummy member by the releasing operation of the first attaching/detaching mechanism. The pressing jigs are separated from the respective pressing units, and the dummy members (each pressing jigs) are retracted from the measurement position to the retracted position by the moving means. This makes it possible to test multiple objects with different seal surface shapes.
By attaching and detaching the attachment/detachment mechanism and the second attachment/detachment mechanism, each pressing jig can be automatically replaced according to changes in the sealing surface without the need for human intervention, making it possible to shorten the replacement work and prevent leaks. The efficiency of inspection work will be improved.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

1 to 3 show a leak test device according to an embodiment of the present invention, in which 1 indicates a plurality of supporting legs 2,
A base 2, . A carry-in conveyor 6, which is equipped with a plurality of rollers 5, 5, etc., is arranged on the upper left side of the base 1, and carries the inspected object W after the inspection is completed. It is a carry-out conveyor equipped with a plurality of rollers 7, 7, ... carrying out the carry-out to the outside, and includes the carry-in conveyor 4 and the carry-out conveyor 6.
The rollers 5 and 7 are rotationally driven by drive sources 8 and 9 such as electric motors, respectively.

Further, reference numerals 10 to 15 denote a plurality of (six) pressing units arranged corresponding to the seal surface of the object W to be inspected, and the pressing units 10 to 13 that press each seal side surface of the object W to be inspected are They are arranged on the left and right and front and back positions of the base 1, and the object to be inspected W
A pressing unit 14 that presses the upper surface of the seal of the inspection object W 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 with a pressing plate 16 connected to the tip of a piston rod 17a,
In the pressing units 10 to 13, which are equipped with guide cylinders 18 installed on both sides of the fluid pressure cylinder 17 and press each seal side surface of the object W to be inspected, the fluid cylinder 17 is fixedly installed on the base 1. Each piston rod 17a is horizontally supported by the mounting frame 19 with the tip thereof facing inward. In addition, in the pressing unit 14 that presses the upper surface of the seal of the object to be inspected W, the fluid pressure cylinder 17 is mounted on a top plate that is horizontally supported above the base 1 by a plurality of (four) columns 20, 20, . The piston rod 17a is supported by the 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.

Further, 23 to 28 are six pressing jigs that are detachably held in the respective pressing units 10 to 15 by a first attachment/detachment mechanism 29, and each of the pressing jigs 23 to 28 has an inspection function. A pressing part 30 that seals and closes the opening of the object to be inspected W carried into the position is provided protruding from one side, and engaging protrusions 31 are provided opposingly protruding from both sides.

Specifically, as shown in FIG. 6 in detail, the first attachment/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 circumferential surface on the distal end side has a slightly larger diameter. The cylindrical body 32 is set to
A cylinder 33 is attached to the rear end and has a piston rod 33a arranged corresponding to the axial center position within the cylinder 32, and a cylinder 33 is fitted into the cylinder 32 and the bottom surface is connected to the tip of the piston rod 33a of the cylinder 33. Due to the expansion and contraction operation of the cylinder 33, the cylindrical body 3
A sliding body 35 having a blind hole 34 moves in the axial direction within the sliding body 35, and a plurality of holes 36, 36, . It consists of a plurality of balls 37, 37, . Then, one of the engagement protrusions 31, 31 of each of the pressing jigs 23 to 28 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. Each ball 37 is made to protrude into the blind hole 34 and the engaging protrusion 31
The pressing jigs 23 to 28 are held by the pressing units 10 to 15, respectively.

In addition, among the above-mentioned pressing units 10 to 15,
The press plates 16 of several press units corresponding to mutually independent air conditioning of the test object W are provided with gas supplied from a gas supply source (not shown) through nozzles 38 to the cavity of the test object W. A supply port 39 is opened for each of the above-mentioned pressing units 10 to 15.
When the press jigs 23 to 28 are held in the supply port 39, the press parts 30 of each of the press jigs 23 to 28 are held.
It communicates with a supply passage 40 provided through the. Further, the cylindrical body 32 of the first attachment/detachment mechanism 29 is
A nozzle 41 is attached to the circumferential surface, and blows air into the sliding body 35 from the pores 42, and at the same time, the pressure plate 1
6 is also fitted with a nozzle 43 so as to eject air from a hole 44 toward the pressing jigs 23 to 28, thereby removing dust and the like that would be an obstacle to the attachment/detachment operation. Furthermore, each of the pressing jigs 23 to 28 is provided with 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 and 48 are the moving means 49.
is moved between the above-mentioned inspection position and the retreat position. 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 rotating shaft 51 via a support plate 53. Further, each guide column member 52 is connected to a frame member 54.
The frame member 54 is fitted into holes 56 passing through in the vertical direction of a pair of sliding cylinders 55 provided in the frame member 54, and the frame member 54 is moved up and down by the operation of a lift drive source (not shown). Further, the frame member 54 includes a fluid pressure cylinder 57 having a piston rod 57a extending horizontally so as to be extendable and retractable;
A guide rod 5 telescopically extending in the same direction as 7a.
A pair of guide cylinders 58, 58 each having a diameter of 8a are arranged as one set so as to extend and contract in the perpendicular direction. The dummy members 47 and 48 are fixed to the tips of the rods 57a and 58a, respectively.

On the other hand, an operating rod 5 is attached to the lower end of the rotation shaft 51.
One end of the operating rod 59 is connected to a swing cylinder 60 disposed below the base 1, and the other end of the operating rod 59 is connected to a swing cylinder 60 disposed below the base 1.
The frame member 54 is pivoted to the tip of a horizontally extending piston rod 60a, and the frame member 54 is attached to the swing cylinder 60.
It is designed to rotate by the expansion and contraction action of.
That is, the dummy members 47 and 48 are moved up and down and rotated by the operation of the lifting drive source and the swing cylinder 60, and are moved forward and backward by the operation of the fluid pressure cylinder 57. It's getting old.

Further, the one dummy member 47 is provided with a second attachment/detachment mechanism 61 that detachably holds each of the pressing jigs 23 to 28. This second attachment/detachment mechanism 61 is configured in the same manner as the first attachment/detachment mechanism 29 (in the drawings, the same components are given the same reference numerals and their explanations are omitted). The ball 37 is engaged with the bulge 31a of the engagement protrusion 31 provided on the other side, so that the dummy member 47 holds each pressing jig. On the other hand, the other dummy member 48 is also provided with a second attachment/detachment mechanism 61, and the second attachment/detachment mechanism 61 seals and closes the openings of the test objects with different seal surface shapes. ' to 28' are retained.
Then, each of the above-mentioned pressing jigs 23, 23' to 28, 2
8' are each moved from the retracted position to the inspection position by the operation of the moving means 49, and delivered to each of the pressing units 10 to 15 to perform a leak test on the object W to be inspected. Moreover, after the leak test is completed, it will be transferred to each dummy member 47, 48.

The pressing jigs 28, 28' for pressing the lower surface of the seal of the object W to be inspected include a support frame 63 with a plurality of rollers 62, 62, . They are provided on both sides in the conveyance direction in a state where they are urged upward by. That is, the pressing jigs 28, 28' are used to hold the inspection object W transported by the carry-in conveyor 4.
It also has a conveyance function for transporting the inspected object W to the inspection position and for carrying out the inspected object W after the inspection to the carry-out conveyor 6.

Further, on one side of the carry-out conveyor 6, a carry-out cylinder 65 is disposed for carrying out the defective inspection object W in which gas leakage has occurred during inspection from the regular carry-out route to another route. By the extension of the carry-out cylinder 65, the defective inspection object W is carried out to a carry-out chute 66 provided on the other side of the carry-out conveyor 6. In addition, the unloading conveyor 6
A marking cylinder (not shown) is provided on the side of the delivery chute 66 to mark a defective object to be inspected that has gas leakage. Furthermore, the carry-in conveyor 4 has a carry-out chute 66.
A carry-in chute 67 is provided for carrying the inspected object W that has been carried out and repaired to the inspection position in order to be inspected again.

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 compressed by the contraction operation of each fluid pressure cylinder 17 as shown in FIGS. 4 and 5. It is regressed as shown by the solid line in the figure. 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 to 28 each having a pressing part 30 for sealing and closing the opening of the object W to be inspected.
are each detachably held by a second attachment/detachment mechanism 61.

(2) After that, the lifting drive source of the moving means 49 is operated to lower the engaging protrusion 3 of the pressing jig 28.
1 is fitted into the blind hole 34 of the sliding body 35 provided on the pressing plate 16 of the pressing unit 15, and the ball 37 is engaged with the bulge 31a of the engagement protrusion 31 by the contraction operation of the cylinder 33. That is,
The pressing jig 28 is held on the pressing unit 15 by the first attachment/detachment mechanism 29.

(3) Next, the fluid pressure cylinder 17 of the pressing unit 15 is contracted to release the dummy member 47.
is placed at the measurement position, and then the fluid pressure cylinders 17 of the other pressing units 10 to 14 are extended and operated in the same manner as in (2) above to remove each pressing jig 23 by the first attachment/detachment mechanism 29. -27 are held in the pressing units 10-14.

(4) After that, the cylinder 33 of each second attachment/detachment mechanism 61
is extended to release the engaged state of the engagement protrusion 31 by the ball 37, and the press plates 16 of each of the other press units 10 to 14 except the lower press unit 15 are retracted to the position shown 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.

(5) Next, the fluid pressure cylinder 17 of the lower pressing unit 15 is operated to extend to raise the pressing plate 16, and then 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 telescopically operated and the object W to be inspected is placed at the measurement position, the fluid pressure cylinder 17 of the other pressing units 10 to 14 is moved.
7 is extended and the pressing jigs 23 to 28 are used to seal and close the opening of the cavity (oil way, water jacket, locker room, etc.) of the object W to be inspected (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 inside 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. By the extension operation of the carry-out cylinder 65, the sheet is carried out to the carry-out chute 66, and after repairing the defective parts, it is carried into the carry-in conveyor 4 through the carry-in chute 67, and the inspection is performed again.

(7) By repeating the above-mentioned operations, the leak test of the inspected object W is performed continuously.
When inspecting an object to be inspected with a different seal surface shape, the first attachment/detachment mechanism 2 is removed by reversing the above operation.
9 and the second attachment/detachment mechanism 61, the dummy member 4
7 and each of the pressing units 10 to 15, and then a dummy member 48 set in a shape corresponding to the external shape of the object to be inspected is transferred in the same manner as in (1) above. Each pressing jig 2 held by the dummy member 48 is moved from the retracted position to the measurement position by the operation, and then by the same operation.
3' to 28' are transferred between the dummy member 48 and each of the pressing units 10 to 15 by the first attachment/detachment mechanism 29 and the second attachment/detachment mechanism 61 to perform a leak test on the object to be inspected.

Therefore, in the leak test apparatus of the above embodiment, when performing a leak test on a plurality of test objects W having different seal surface shapes, a plurality of The pressing jigs 23, 23' to 28, 28' are connected to 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 dummy members 47, 48 that supply gas to the cavity of the object W to be inspected. Since the first attachment/detachment mechanism 29 and the second attachment/detachment mechanism 61 are configured to transfer the press units 10 to 15, each of the press jigs 23, 2
3' to 28, 28' are automated, and the opening of each test object W can be quickly sealed and closed without any manual effort, thereby improving leak detection workability. .

(Effects of the Invention) As explained above, according to the leak test device of the present invention, the first attachment/detachment mechanism and the second attachment/detachment mechanism for detachably holding the plurality of pressing jigs on the dummy member and the pressing unit are provided. This makes it possible to quickly and automatically replace the press jig suitable for closing the openings of multiple objects to be inspected with different seal surface shapes, making it possible to quickly and automatically replace the press jig with the press unit. Workability can be improved.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIGS. 1 to 3 are front views showing a leak test state, respectively.
A plan view and a side view, and FIGS. 4 to 6 are an enlarged plan view, an enlarged side view, and an enlarged plan view of essential parts, respectively, showing a state in which the pressing jig is held by a dummy member. 10-15...pressing unit, 23, 23'-2
8, 28'...pressing jig, 29...first attachment/detachment mechanism, 3
0...Press portion, 47, 48...Dummy member, 49...Movement means, 61...Second attachment/detachment mechanism, W...Object to be inspected.

Claims (1)

[Claims] 1. A leak test device that measures the leakage of gas sealed in the cavities by sealing and closing the openings of a plurality of test objects having cavities that open to the outside and having different seal surface shapes, which A plurality of pressing jigs each having a pressing part for sealing and closing an opening of the object to be inspected, and a plurality of pressing jigs arranged corresponding to the sealing surface of each of the objects to be inspected, and pressing each of the pressing jigs against the sealing surface of the object to be inspected. a plurality of pressing units, a first attachment/detachment mechanism that allows each of the pressing units to detachably hold each of the pressing jigs, and a plurality of dummy members set in a shape corresponding to approximately the external shape of each of the objects to be inspected. , comprising 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.