SU1411595A1 - Trrnsducer for checking articles with elastic shell for leak-proofness - Google Patents

Abstract

The invention relates to devices for monitoring the tightness of products with an elastic sheath by measuring their deformation in vacuum. The aim of the invention is to increase the accuracy and informativeness of the control

Description

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 Tightness. Inside the housing 1, a pusher rod 2 is installed with a spring | blue 3; The working end of the pusher 2 is designed to contact elastic | (product bolt 4; Double-shouldered rod 9 is installed on the housing 1 by means of; a cross-shaped hinge 10. On the larger lever arm 9 a contact 11 is installed electrically isolated from the corporate unit 1; the smaller arm of the pinner 9 is made in the form of a sector 12 made of magnetically soft material. In the middle part of the push rod 2 there is a flat permanent magnet 13 in contact with the cylindrical surface

sector 12, the electrical circuit of the sensor contains a timer 15, a power source 16, a switch 17 of the power source 165, the first and second signal elements 18, 19, a signal processing unit 20 including the first and second relays 21, 22, the first and second relays 23, 24 time and the remote switch 25, Set the sensor to a predetermined amount of the lever 9 with contact 11, corresponding to the course of the rod pusher 2, Set the timer 15 to the specified amount of time and begin the test. 1 з „п, f-ly, 2 ill.

The invention relates to the measurement of non-electronic values, in particular small displacements, by an electromechanical method and can be used in devices for monitoring the tightness of products with elastic shells, for example, products of the electronics industry; in their manufacture.

The purpose of the invention is to improve the accuracy and informativeness of leak tightness by supplying the sensor with a fixed contact electrically isolated from the housing, a second signal element ;, a switch and a signal processing unit j noToi that the sensor readings do not depend on the speed of product evacuation and control is performed at a constant, previously known and the magnitude of the change in deformation of the shell of the product measured by the sensor,

- ..,. -. as well as increasing reliability; by supplying the sensor with a contact electrically connected to the housing, made in the form of a spring-loaded screw and a flat permanent magnet, and making the movable contact element in the form of a double arm.

Fig. 1 shows a sensor for monitoring the tightness of articles with an elastic sheath, the section in Fig. 2 shows the dependence of pressure P and deformation Y on time.

The sensor includes a housing 1, inside which a rod pusher 2 is installed, spring-loaded 3, the working end of the pusher 2 is designed to come into contact with the elastic shell of the test product 4, the product 4 is mounted on the table 5, which can move with the product 4 relative to the working end pushers - 2 with screw 6 screwed into housing 1 and in contact with table 5,

Clamp 7 is mounted on housing 1 ,. intended for mounting a dial indicator (not shown) with which the sensor is built.

The sensor also contains an electrically isolated from the housing 1 fixed contact 8, a movable contact element, made in the form of a double arm 9, mounted on the housing 1 by means of a spring cross joint 10 and kinematically connected with the rod pusher 2.

The larger arm of lever 9 is electrically isolated from body 1, contact 11, the smaller arm of lever 9 is made in the form of a sector 12 of magnetically soft material, for example low carbon steel. In the middle part of the pusher 2 there is a flat permanent magnet 13 in contact with the cylindrical surface sector 12 of the lever 9. Adjustable contact 14, electrically connected

with case 1, made in the form of a spring-loaded screw.

Since the sector 12 is made of a magnet of a soft material, it is attracted to the permanent magnet 13 of the pusher 2. When moving the pusher .2 upward, the magnet 13 rotates the sector 12 and the lever 9 clockwise until the contact 11 with contact 14, then the movement lever 9 stops.

The sensor circuit contains a timer 15 with a relay off and a start input for timer 15, a power source 16, a switch 17 of the power source 16, a first 18 and second 19 signal elements, a signal processing unit 20 including the first 21 and second 22 relays, the first 23 and second 24 time relays and a remote switch 25. The first output of the power supply 16 is connected to the switching contact of the switch 17 of the power supply 16, and the second is directly connected to the first terminals of the winding of the first time relay 23 and the first winding of the remote switch Atela 25, the first output winding of the second time relay 24 and through parallel connected closing contacts 26 and 27 of the first time step 23 and the first relay 21 - with the first output winding of the first relay 21.

The second winding pins of the first time relay 23, the first winding of the remote switch 25 and the windings of the first relay 21 are connected to the Kopirycy 1 of the sensor. The second output of the power supply 16 through the successively connected moving contact 28, the first contact 29 of the switching group of the remote switch 25 and the first normally closed contact 30 of the first relay

21 connected to the movable contact 31 of the switching group of the second relay 22

and the first output winding of the second relay 22.

The second output winding of the second relay

22 through the disconnecting contacts 32 of the timer disconnection relay 15 is connected to the fixed contact 8.

The first, contact 33 of the switching group of the second relay 22 is directly connected to the first output of the second signal element 19, and the second contact 31 of the switching group of the second relay 22 is connected via the closing contacts 34 of the timer 15 relay to the first output of the first signal element 18.

The first output of the second signal element 19 and the second output of the first signal element 18, as well as the isolated contact 11 of the movable contact element 9 and the second output of the second time relay 24 are connected to the first contact of the switch 17 of the power supply 16.

The isolated contact 11 is connected via the closing contacts 33 of the second relay 22 to the second end of its winding. The second output of the second signal element 19 through the closing contacts 35 of the second time relay 24 is connected to the second contact 28 of the switching group of the remote switch 25, and serially connected to the switching terminal 29 and the opening 36 contacts of the remote switch l 25 and the first relay 21 are connected to the start input of the timer 15, respectively.

The characteristics P f (t) and Y f (t) of the variations of the time variation of the pressure P in the vacuum chamber with the sensor and the product 4 and the deformation Y of the elastic shell of the product 4. are shown in FIG. 2.

When evacuating the chamber, depending on the speed of evacuation, the pressure P in the chamber decreases during time t or tj from 1 kgf / cm to, (—constant strain pressure, a further decrease of which does not cause an increase in the deformation achieved in an elastic shell of a product having high tightness Q) and the final pressure in the chamber is set approximately equal to P (RVI is the limiting pressure that the pump gives).

The tightness of the elastic shell article 4 can be accurately measured by determining the rate of change of the amplitude value of the shell deformation when a vacuum is applied to the product 4, the value of which is less than the pressure.

where ftY is the change in the amplitude value Y of the deformation of the elastic shell, min,

tg - time s

during which

The 24 time relay is also powered by

the amplitude value changes the time t (FIG. 2), with

elk, by jY, p. At this cathode, the pumping rate 1} does not affect the results of the tightness measurement.

If the speed Vjj of the deformation Y of the product f with the elastic shell t ((, time, but after the end of the 5th contact is closed contact 11 and the adjustable contact 14Jt is the time from the read time relay 24 from the start of the leak test, when vacuum starts at the same time

1 |: OY5 having a tightness Q, 10 cameras with product 4 is equal and the switch 17 of the power supply 16 is turned to position I). .

If the product 4 has a large leak, its shell does not increase in size and the rod pusher 2 over the lever arm 9 does not affect the contacts 8, 11 and 14 of the sensor. The elements of the signal processing unit 20 do not change their initial state - 20 neither. After counting down time t relays

24 time closes its contacts 35

Tiki Y (} product 4 has hermes and includes the second signal element, Qg is worse than Qo

Determination of product tightness

4 is made by comparing the actual size and opens the conical speed Vji or Vjj of steps 11 and 8, but does not close the contact 4-degree deformation value with 11 and 14 After the time t

coupon speed, product 4,., time relay 24 closes its contacting tightness Q Comparison of the 35 k includes the signal element of the speeds V-g and V-p with the speed Vg Scrap, is produced by the rdtchnka signal processing unit 20.

4y

1 section 1 characteristic Y

f (t) ,, then at the speed Vj, the change

uY Reformation Y equal to - (section 2

 -F

characteristics Y fCt), product 4 has a leak tightness better than Qo

fr speed v of change in deformation -1: 0-3.

 fj 5 equal to - (section 3, characteristics 9 Scrap, if product 4 has a large leak, its shell slightly increases when product 4 does not have a large leak. Its shell under the influence of excessive pressure inside the gas increases its disperser works as follows: The tightness of the product 4 is measured with an elastic sheath of measure, and, after a distance of G, it is known that, as the amp amp value changes, Y deformation of this

 Products 4 on the value of d Y 2 microns in 11 for t 60 s, product 4 has 1 | Q tightness

: Adjust the sensor in such a way, 4 so that the stroke S of the movable contact Element with contact 11 corresponds; uY rod pusher move 2, 1 avny 2 microns. The stroke aY of the pusher 2 ilpH is controlled by setting by the display of a dial-type indicator (not “rendered) j measuring rod

 foporo rests on the butt of the rod pusher 2.

Set timer 15 to count

“Remeni to, 60 p. Set on p

From the working end of the rod pusher 2 Id, overcoming the force of the spring 3s raises it up. Sector 12 turns the market 4Q chag 9 clockwise, opening contact 11 and contact 8,

After the pusher 2 rises by the value of Y, contacts 11 and 14 are closed. The remote switch 25 is turned on and its contacts 29 are closed, and contacts 28 are switched, therefore, after timing t, the closure of contacts 35 of the relay 24 does not activate the signal element 19 Marriage.

Simultaneously with the closure of contact 1 1 with contact 14 time relay 23

45

50

Table-5 with a gap between the working terminal time tg (tg is the time counted 1 |; ohm pusher 2 and the shell; the time relay 23 is from the moment it is connected to the sensor with the product 4 number of contact 11 with contact 14 datijtaK of the vacuum chamber ). - chika) 3afMKaeT your contacts 26,

(At the same time, they begin to evacuate. Relay 21 is turned on and self-blocked

The camera and switch switch 17 contacts 27. Relay 21 opens its

power supply 16 is in position I, contacts 36 and 30. Time relay 23.

The 24 time relay is also powered by

t t ((, time, but the expiration of which closes the contact 11 and the adjustable contact 14J t is the time counted by the time relay 24 from the start of the leak test, when the evacuation starts simultaneously and turns on the second signal element

detects its dimensions and opens contacts 11 and 8, but does not close contacts 11 and 14. After the time t

 Marriage, If item 4 has a large leak, its shell slightly closes its contact time a little 24 hours before the signal element turns on.

If item 4 does not have a large tech. its shell under the influence of the overpressure of the gas inside it increases its working end of the rod pusher 2 Id overcoming the force of the spring 3s raises it up. Sector 12 turns clockwise lever 9, opening contact 11 and contact 8,

After the pusher 2 rises by the value of Y, contacts 11 and 14 are closed. The remote switch 25 is turned on and its contacts 29 are closed, and contacts 28 are switched, therefore, after timing t, the closure of contacts 35 of the relay 24 does not activate the signal element 19 Marriage.

Simultaneously with the closure of contact 1 1 with contact 14 time relay 23

counting the time tg, opens its contacts 26. After closing the contact 1 1 and contact 14, the lever 9 and the sector

12 remains stationary, but the shell of the product 4 continues to increase to the largest (amplitude) size Y. The plunger 2, together with the magnet 13, continues to move upwards, and this movement stops when the size Y is the largest.

Over time, the hermetic shell of the product 4 decreases in size and, following the shell of the product 4, the rod pusher 2 with a magnet

13 goes down. Sector 12 rotates counterclockwise the lever 9, opening contacts 11 and 14. Relay 21 de-energizes upon the first opening of these contacts. The contacts 27 of the relay 21 are opened and the circuit is protected from further false sanycKOB caused by the bounce of the contacts 11 and 14. Contracts 36 and 30 of the relay 21 are closed. Timer 15 starts counting time t

than closes the counter 15 counts

 tL

&about

If earlier, bars 11

and

25 tapping contacts of the first time relay and the first relay - with the first output of the coils of the first relay, the second outputs of the coils of the first time relay, the first winding of the remote switch

time t, its contacts 34 are closed,

and pins 32 are smoldered that the windings of the first relay are connected to

The idea is that the tightness of the product 4 is better than Q (section 2 of the characteristic Y f (t) in figure 2). Signal element 18 Norm /

If earlier than timer 15 counts down time tg, contact 11 is closed with contract 8 — relay 22 is turned on and self-blocked by contacts 33. Contacts 31 of relay 22 are switched. This state of the circuit elements indicates that the tightness of the product 4 is worse than Q. Signal element 19 Reject is turned on.

After the end of the measurement cycle, the switch 17 of the power supply 16 is switched to position II. In this case, the second winding of the remote switch 25 is turned on and it returns to its original state.

Claims (1)

1. A sensor for monitoring the tightness of products with an elastic sheath, comprising a housing, a spring-loaded pusher mounted therein, the working end of which is intended for contact with the surface product, a movable contact element with an electrically isolated contact from the case, a timer with a switch-off relay and a timer start input, a power source and a signal element, characterized in that, in order to improve the accuracy and informativity, it is electrically isolated from the case by a fixed contact, a second signal element, a signal processing unit, an on-switch, a first and second relay and a first and second time relay, a switch A power supply source and a remote switch, the first power supply output is connected to the switching contact of the power supply switch, and the second is directly with the first terminals of the winding of the first time relay and the first winding of the remote switch and the first of the windings of the second time relay and through parallel connected closing contacts of the first time relay and the first relay - with the first terminal of the winding of the first relay, the second terminals of the winding of the first time relay, the first winding remote switch five 0 five 0 five the sensor body, the second power supply output through a series-connected power contact and the first contact of the switching group of the remote switch and the first disconnecting contact of the first relay are connected to the moving contact of the switching group of the second relay and the first output winding of the second relay, and the second winding of the second relay the timer is connected to a fixed contact, the first contact of the switching group of the second relay is connected directly to the first pin of the second signaling element, and the second contact of the switching group of the second relay is connected via the closing contacts of the timer off relay to the first output of the first signal element, the first output of the second signal element and the second output of the first signal element, as well as the isolated contact of the moving contact element and the second output of the second relay time connected to the first contact of the power source switch, the first output of the second winding of the remote switch is connected to the first PTH / f (i) i.e