SU550571A1 - Device for quality control of products - Google Patents

Description

delays, a prohibition circuit connected between the output of the signal processing unit and the amplitude discriminator input, a time relay and a memory unit connected to the amplitude discriminator outputs, the time relay output is connected to a memory unit, one of the outputs of which is connected to the circuit, and the others through the first and second delay circuits, respectively, are connected with the phase shifter and the indicator.

The drawing shows a block diagram of the device.

The device contains a generator 1 with a reference and a working converter 2, a signal processing unit 3 connected by signal inputs to the converters 2, an indicator i and an amplitude discriminator 5 connected to the output of the signal processing unit 3, and the discriminator 5 has several channels with adjustable thresholds actuation, and phase shifter 6 connected between generator i and the control input of signal processing unit 3 and having at least two phase-shifting circuits. In the initial state, one of these chains is connected to the phase shifter 6. The device includes the first and second delay circuits 7 and 8, the prohibition circuit 9, turned on by the output of the signal processing unit 3 and the amplitude discriminator input 5, the time relay 10 and the memory unit 11, one of the outputs of which is connected to the prohibition circuit 9, and the others and the second delay circuits 7 and 8 are connected respectively to the phase shifter 6 and the indicator 4.

The device is configured and operated on it as follows.

On the dependences between the controlled properties of the products and the components of the signal (harmonics) selected for control on the complex plane, an area for which the control ensures unambiguity and optimum sensitivity between the controlled properties and the projections of the signals on the selected axis of control is determined. The control axis is set by selecting the phase of the reference voltage using one of the phase-regulating chains, which is initially connected to the phase rotator 6. Using the controls, set the thresholds for one of the discriminator channels 5 corresponding to two limit values of the projected signals for the selected (original) areas of addiction. The response thresholds of other channels of the discriminator 5 are set in accordance with the values of the projections of signals for other dependency areas. For the same areas, using the appropriate phase-regulating circuits of the phase shifter 6, the phases of the reference voltage are set to provide optimum sensitivity to changes in the monitored characteristics.

The signal from the transducers 2, fed from the generator 1, is fed to the input of the signal processing unit 3, which provides 1 ohm epats ;; th and amplitude-phase-frequency frequency; transducers signals when placed in them, respectively, of reference and controlled products. The reference, for example, of the corresponding frequency, which is fed to the control input of the signal processing unit 3, forms the voltage of the phase shifter 6 of the gooperatur 1. The output output of the processing unit 3

The signal characterizing the quality of the product being monitored enters through the circuit 9 and the input of the amplitude discriminator, O, whose number of channels is equal to the number of interchangeable phase-controlled chains. In the initial state, the prohibition circuit 9 skips the voltage of the signal processing unit 3, since its control input has a loop signal. The discriminator 5, in accordance with the setting of the trigger thresholds, determines whether the products belong to this or that group and transmits this information to the memory block 11, which stores it for the time required to display the control results and is set using the time relay 10,

the input of which is the timepio with the memory block 11 receives a signal from the discriminator 5. And the “ILR1” cell (not shown in the diagram) can be turned on at the input of the time relay 10, allowing it to start from any drops

discriminator 5.

If the output signaling of the signal processing unit 3 does not exceed the trigger pressure drop of the discriminator 5 corresponding to the selected source area of dependence, the memory unit 11, through the delay circuit 8, gives a command to connect to the output of the signal processing unit 3 of the indicator 4, which can also be input The “ILR” cell is enabled (its diagram is not shown).

After the expiry of the control results indication time, “information is reset. If the output voltage of the unit 3 goes beyond the threshold of triggering, the discriminator 5 corresponding to the initial

the dependency region, then another discriminator dripped. In this case, the memory block 11 gives the command a unrav yuy input to the prohibition circuit 9 and the discriminator is disconnected from the output of the block 3. From the others

The outputs of block I of memory, through delay circuits 7 and 8, receive commands corresponding to the connection of a new phase-regulating chain and indicator 4, whose readings are proportional to the signal projection and new

control axis

Delay circuits 7 and 8 provide sequential (time-coordinated) switching of phase-regulating chains and connecting indicator 4. These commands are executed later than the command to the control input of the inhibit circuit 9 occurs, which prevents the discriminator 5 from firing during phase-shifting chains and multi-valued indications

1P1Dicator 4. After the expiration time expires, time relay 10 gives “a reset of information and the phase-shifting circuit is connected, which provides the initial value of the voltage phase. The use of the proposed device makes it possible to increase the accuracy of control in wide areas of variation of the controlled characteristics of the product.

Claims (3)

1. USSR author's certificate No. 384064, M. Kl.2 G 01Х 27/86, 1971. 2. Authors certificate USSR 203928, M. Kl.2 G 01B 7/06, 1966. 3.I. A. Solomatin, “Methods and means for non-destructive quality control in the podshchitnikovoy industry, M., 1969, p. 61-62 (Prototin).