SU1427193A1 - Device for checking leak-proofness of elastic articles - Google Patents

Abstract

The invention relates to the control of the tightness of elastic products and makes it possible to increase the reliability by eliminating the influence of transients at the start of control. A rod 10 is placed in the vacuum chamber 1. Membrane unit 4 is installed coaxially with the shroud 10. The first and second cavities 5.6 of the unit 4 are connected to the chamber 1, a third to the atmosphere, the fourth cavity 12 to the source of compressed gas, and the fifth to a nozzle 16 interacting with the valve 15. The rod 10 interacts with the membrane 11. The pressure source is connected via the valve 24 to the nozzle 16, the latter is connected to the direct input of the trigger 19, the inverse input of which is connected through 23 to the pressure source. Chamber 1 through valve 8 is connected to source 7 of vacuum. Time relay 22 has three cells that are connected in series and connected to valves 8, 24, and 23. When the first cell starts up in chamber 1 and in cavity 3,6 of block 4, a vacuum is created, when the second cell triggers, trigger 19 is reset to 1, and when matched The third cell starts the process of controlling the product 2. If the product 2 is sealed, then its force on the rod 10 is compensated for by pressure in the fourth cavity 12 of unit 4, the trigger 19 is reset to zero, which means the product is. 1 il. c & (L 4 1h5 CO with

Description

The invention relates to a testing technique and allows monitoring the tightness of elastic products by changing their geometric dimensions.

The purpose of the invention is to determine the reliability by eliminating the influence of transients at the beginning of the control,

The drawing shows a diagram of the device.

A device for monitoring the leaktightness of elastic products contains (a vacuum chamber 1 in which a controlled article 2 is placed. The cavity of chamber 1 communicates with the entrance; the first cavity 3 n of the cap-shaped membrane unit 4 through channel 5, as well as with the second cavity - test 6 compensation test; vacuum and with vacuum source 7: through valve 8. Third cavity block 4 is communicated with the atmosphere, - Product 2 is in contact with disc 9 of stem 10 with first sensitive membrane 11 block 4, fourth cavity 12 task force block 4 oedinena pressure setter 13. The block 4 is connected to the pressure 13 eadatchikom.

The movements of the membranes II and 15 of block 4 are fixed by a measuring unit formed by the membrane 15, which is a damper, and the nozzle 16, the latter through throttle 17 and the inter-throttle chamber 18 is connected to trigger 19, having a direct input 20 and an inverse input 21, time relay 22, state The main one of three series-connected cells provides signals for t,, tj and t mode changes. the cells are connected to valves 23 and 24, which connect power to the corresponding nodes of the device,.,

The pressure source (not shown) is connected via valve 24 to throttle 17, direct input 20 of trigger 19 is connected to nozzle 16, and inverse input 21 via valve 23 to pressure source. The third cavity of the block 4 is connected to the atmosphere, and the block 4 is installed with the rod 10,

The device works as follows.

When the t command is given, the trigger 19 detects a defect signal corresponding to the detection of the untight product 2.

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chamber 1 is connected to vacuum source 7 by switching valve 8, with hermetic product 2, the elastic shell expands, exerting a force on disk area 9 and through rod 10 on sensing membrane 11, if threshold force is terminated by pressure setting device 13 and the cavities 12 of the blocks 4, the membranes 11 and 15 are moved, pinned by the membrane 15, the nozzle 14, the signal t is energized, to the measuring node through the valve 24, when the hermetic product 2 produces a signal in the inter-throttling chamber 18, Converting rejects from trigger 19. With a leaky product, the indications on trigger 19 do not change.

The device makes it possible to increase the accuracy of leak tightness control and to ensure the possibility of automation by eliminating the influence of noise when switching operating modes and changing the test vacuum.

Claims (1)

The design of the rod with a low-mass disc allows to increase the sensitivity of the control, the claims of the invention A device for monitoring the tightness of elastic products, comprising a vacuum chamber, a rod mounted therein, intended to contact its working end with a product, a sensor for moving the free end of the rod, a leak indicator associated with it, and a vacuum source connected via a first valve to the chamber, characterized by that, in order to increase the reliability by eliminating the effect of transients at the beginning of control, the displacement sensor is made in the form of a standard plate diaphragm unit with a nozzle mounted coaxially with the stem, the free end of which is located in the first cavity of the membrane unit and contacts the first membrane, the first and second cavities of the membrane unit communicate with the cavity of the vacuum chamber, the third cavity - with the atmosphere, the BbinWJiHeH leak indicator in the form of a trigger with direct and inverse inputs, and - The device is equipped with a pressure source, second and third valves, and a time switch that includes 3 1427193 the first, second and third cells and you — the source of pressure is connected through complete with the possibility of a sequential second valve with a balanced inlet their srabatagani, starting the strigger, through the third valve - with first, the pressure source is connected to the nozzle, the latter is connected to the direct the fourth cavity of the membrane block input trigger, the first cell relay ka, the nozzle is located in the fifth band-time connected to the second valve, These membrane blocks with the possibility of a second with the first, and a third with anxiety interaction with the fourth membrane, dark valve.