SU1629769A1 - Apparatus for testing tightness of closed hollow products - Google Patents

Abstract

The invention relates to the monitoring of the tightness of compact hollow products and allows for greater reliability while simultaneously determining the leakage of the chamber. The device contains a test chamber 1 with a cover 6. The drive for opening the cover 6 is made in the form of a ram 4, on the rod 5 of which the cover 6 is fixed, and on the additional rod 7 - stop 8. Two pressure gauges are made identically in the form of tanks 13, 14, respectively, closed elastic members 16, 18 placed in the cavities of these containers; the cavities of the elements 16, 18 communicate with the cavity of the chamber 1 and the cavity between the o-rings 10, 11 of the cover 6, respectively. The test pressure source 19 is reported through valves (L o to co with f 18

Description

23, 24 with cavities of chambers 13 and 1, respectively. Valves 23, 24 are made in the form of plugs installed on the actuator stem 25 to close them. The seats of the valves 23, 24 are located in the body of the chamber (1, respectively, of the plugs. The product 2 is installed in the chamber f, sealed with a cover 6, which is moved by the piston Yu

power cylinder 4. The stop 8 provides a constant initial pressure in the cavity of the elastic element 18. From the source 19 of the test pressure, the cavity of the chamber 1 and the tank 13C are filled. Then the valves 23 and 24 simultaneously close, providing equal pressure in the chamber 1 and the tank 13. „About f-ly, 1 ill.

The invention relates to a testing technique and can be applied to control the tightness of small-sized products, such as watch movements.

The purpose of the invention is to increase the reliability while simultaneously determining the leakage of the chamber by an identical second pressure recorder by providing identical conditions for the preparation of meters during various tests.

The drawing shows a diagram of the device for monitoring the tightness of closed hollow articles.

The device contains a test chamber 1 for accommodating a test article 2 - a watch case. On case 3 of the test chamber 1 there is a pneumatic cylinder 4, on the piston rod 5 of which a cover 6 is fixed at one end, closing the test chamber 1, and an additional rod is mounted on the other 7 with a rigid adjustable stop 8 interacting with the body of the pneumatic cylinder 4 o By means of the stop 8 the position of the lid 6 relative to the body 3 of the test chamber is adjusted ,, Pneumatic cylinder 4, the pistons 5 and 7 and the stop 8 form the Open the covers 6 "

In the case of the pneumatic cylinder 4, a window 9 is made for the installation of the test item 2 in the test chamber 1.

On the upper surface of the casing 3 of the test chamber 1, in the zone of contact with the lid 6, elastic sealing rings 10 and 11 are installed, the space between them and the casing 3 when the lid 6 is closed forms a buffer chamber 12 “Volumes of the test t and buffer 12 chambers in the process

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leak tightness control remains unchanged due to the possibility of adjustment by means of the stop 8 of the position of the cover 6 depending on the elastic properties of the sealing rings 10 and 11,

The device is equipped with two additional chambers: a reference tank 13 and a test tank 14. The tank 13 communicates with the test chamber 1 through the channel 15 by means of the closed elastic element 16, and the container 14 communicates with the buffer chamber through the channel 17 by means of the closed elastic element 18 ,. The closed elastic members 16 and 18 are each pneumatic bellows with an inductive sensor associated with a microprocessor device (not shown). Chamber 1 and container 13 are connected to test pressure source 19 via channels 20-22. The channels 20 and 21 are closed, respectively, by valves 23 and 24 and are in the form of plugs attached to a single rod 25 of a pneumatic actuator for their movement (not shown). The seats of the valves 23 and 24 are made in the body of the chamber 1. The entire leak test system is disconnected from the source 19 of the test pressure by the valve 26,

The device works as follows,

The product 2 is installed in the test chamber 1o through the window 9 of the housing of the pneumatic cylinder 4. After that, compressed air is supplied to the upper cavity of the pneumatic cylinder 4, with the result that the piston rod 5 carrying the cover 6 is lowered. The lid 6 closes the test chamber 1 and presses against the elastic sealing rings 10 and 11, in which case a hermetic 5

The test chamber t and the buffer chamber 12 are in operation. In the process of pressing the cover b to the sealing rings 10 and 1t, the volume of the buffer chamber | 2 decreases and the pressure in it increases. Moving the cover 6 until the adjustable stop 8 stops touches the pneumatic cap 4, and the pressure in the buffer chamber 12, which communicates via channel 17 with element 18, is stabilized;

Further from the pressure source 19 via channels 22, 20 and 21 and valves

26, 23 and 24 supply compressed air to the test chamber 1 and the reference tank 13. After the pressure in the chamber 1 and the tank 13 has stabilized, they are closed and uncoupled by means of the valves 23 and 24. By placing the valves 23 and 2 on the same rod 25 of the pneumatic actuator (not shown) their movement excludes the accidental sacrifice of the davtenits in chamber 1 and container 13, due to the simultaneous start of movement of the valves 23 and 24.

After separation of the chamber 1 and the tank 13, the microprocessor device associated with the elements 16 and 18, which react to the change in pressure difference between them, records the initial pressure drops, respectively, AP {between chamber 1 and capacity 13, as well as DL interlayer 12 and capacity 14 “Next, product 2 is tested for a predetermined period of time - one minute.

After the specified time has elapsed, the final pressure drops are again measured, respectively. between camera 1 and capacity 13 and between camera 12 and capacity 14. Then, the RR to and & P compare; ayut the original & P and APg

However, if the pressure differential between the buffer chamber 12 and the test tank 14 remained unchanged (AP), it is concluded that test chamber 1 maintained its tightness through the O-ring seal 10 and 11 during the test period. In this case, by changing the differential the pressure between the chamber 1 and the reference tank 13 (UP "i UPi determine the degree of leakage of the product 2.

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Thus, the introduction into the device of additional interconnected chambers 12 and the container 13, Ј also the placement of the sealing zone | The test chamber 1 in the buffer chamber 12 makes it possible to combine the time for monitoring the tightness of the test chamber 1 and monitoring the leaktightness of the product 20 itself. This made it possible to differentiate the leaks of chamber 1 and product 2 in the case of commensurability of their leakage values, and Due to the elimination of the leakage effect of chamber 1 on the measurement of leakage of product 2, the accuracy of the control is improved.

Claims (2)

In addition, the arrangement of the isolation valves 23 and 24 on one actuator drive 25 allows one to eliminate the possibility of accidental errors in the initial pressure drop and thereby also increase the reliability and accuracy of the control. Invention Formula 1 o A device for monitoring the tightness of closed hollow articles, containing a chamber with a lid, a first annular sealing element installed in the zone of contact of the lid with a chamber, the first pressure recorder in the chamber, made in the form of a reference container, whose closed elastic element e has an internal cavity communicated with the cavity of the chamber, a source of test pressure, connected through valves to the cavities of the chamber and a reference capacitance, characterized in that, in order to increase the reliability with one Belt determination of chamber leakage by an identical second pressure recorder, it is equipped with a second annular sealing element installed end of the first so that the cavity between them is connected to the second pressure recorder, the lid opening actuator, made in the form of a power cylinder, the rod of which is rigidly connected to the center of the lid, an additional rod mounted on the piston coaxially with the main rod on the opposite side 716297698 piston and passing through the valve cover is designed as a plug cylinder, and the stop element, the mouth of the saddle, and the actuator valves - in the form a supplementary power cylinder, which was added at the free end, body stem outside the cylinder body 1 at the end of the piston which is installed 2. The device according to 1, o, tl and -plugs coaxially with valve seats, It is obvious that they were made in the body of the chamber.