SU1485214A2 - Multipoint temperature controller - Google Patents

Description

The invention relates to automatic temperature controllers and is an improvement to auth.St.

No. 1141386. It allows you to improve the accuracy of temperature control and creates ease of operation by providing the possibility of visual temperature control by points,

channel adjustments in the process of work and operational troubleshooting. The multipoint device for temperature control contains temperature sensors 1, multi-input · analog key 2, measuring unit 3, generator 4 pulses, pulse distributor 5, register 6, keys 7 "triacs 9 with blocks 8 of phase setting and selective control unit consisting of

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a frequency divider 10, two triggers 11 and 12, a multi-position switch 13 and a start switch 15. Block 5 contains a pulse multiplexer with an additional group of information inputs by the number of points. BF 8 includes a control circuit consisting of a capacitor, two variable resistors with different resistances and a flip contact.

1 hp ff, 3 ill.

The invention relates to automatic temperature controllers, can be used in control systems' temperature regime of injection molding machines for processing plastics into products and is an improvement of the invention according to ed. St.

No. 1141386.

The purpose of the invention is to improve the accuracy of regulation and ease of operation.

FIG. 1 shows the functional scheme of the device; on Fig.2distributor pulses; on fig.Z phase setting block.

The multipoint device for temperature control contains (Fig. 1) thermal sensor 1, multi-input analog switch 2, measuring 20 block'Z, generator 4 pulses, distributor 5 pulses, register 6, keys 7, blocks 8 of phase setting, triac actuators 9, divider 10 frequencies, the first 11 and 25 second 12 triggers, the myo-position switch 13, the indicator 14, and the start switch 15. The pulse distributor (Fig. 2) is implemented on the counter 16 pulses, multiplexer 17, the decoder- 18. Phase adjustment blocks 8 include an adjustable resistive circuit 19 and 20, a switch 21. In addition, this block includes Shockley diode 22, a capacitor 23 and a thyristor 24. Nia nutrition source 35 is configured, for example as a transformer. 25, the rectifier 26 and the stabilizer 27. In addition, the device includes heaters 28.

The device works as follows.

The blocks 8 of the phase setting are pre-tuned to the switching angles corresponding to the minimum and maximum heating steps, based on the time of the temperature sensor polling cycle and the permissible temperature variation. The pulses of the generator 4 through the block 5 of the pulse distributor sequentially switch the inputs of the multi-input analog switch 2 and synchronize the bits of the register 6. At the same time, the signals of the thermal sensors 1, proportional to the temperatures of the object points, alternately enter the measuring unit, which generates the corresponding signal (0 or 1) coming for storage in the bits of the register 6. Signals from the output of the register 6 are fed to the keys 7, which, step by step through the phase adjustment blocks 8, provide the necessary switching angle of the triacs 9. P When heating is necessary, the voltage from the stabilizer 27 is supplied through the switch 21 to the block 8 through the variable resistor 19, and if necessary, through the variable resistor 20.

Visual sampling of the temperature by the points, as well as checking the correct functioning of each of the channels is carried out as needed. Myogopotation switch 13 is set to the position corresponding to a specific point. By pushing the start button

five

6

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switch 15 install the trigger 12, the signal from the output of which allows the installation of the trigger 11 on the signal from the output of the frequency divider. In this case, the pulses from the generator 4 reach the frequency divider 10, where they divide their repetition frequency by η by the number of heating points, and then arrive at the counting input ιθ of the trigger 11, the signal from the output of which goes to the multi-position switch 13 preset in the desired position , and to the control input of the multiplexer 17. At 15, the decoder 18 receives signals only from the second group of inputs coming from the multi-position switch 13, and the signals from the output of counter 16 do not arrive. The enabling signal — 20 will be sent only to the output of the decoder 18, which is set by switch 13. When there is an enable signal from trigger 12, the first pulse from the output of divider 10 of frequency 25, trigger 11 is set to turn on indicator 14. Block 5 is controlled in such a way that it issues - signal ^r 'multi-input analog switch 2 to the connection 39 of the measuring unit 3 to a corresponding temperature sensor 1 and the recording issued by the measurement unit 3 commands to the appropriate bit in the register 6 while nZ - polling cycle. This is quite enough for a visual assessment of the true temperature at a given point by the indicator of the measuring unit 3 and the correct functioning of this channel of the device. The temperature deviation above the permissible value indicates the need for adjustment of this channel or its failure. Adjustment can be made during the device’s operation by adjusting the block 8. After the second pulse arrives from the divider Yu, the frequency triggers 11 and 12 are reset and the device automatically returns to the operation mode with sequential polling of thermal sensors 1. Thus, the measuring unit 3

35

40

45

50

14

for the time of control it is connected to one particular point.

The ability to visually control the temperature at any point of the object, the correct functioning of the channels, the rapid detection and elimination of faults improves the control accuracy and ease of operation.

Claims (2)

Claim 1. Multipoint device for temperature control according to auth.St. No. 1141386, characterized in that, in order to improve the control accuracy and ease of operation, the device further comprises a serially connected frequency divider, first and second triggers with a start switch at the installed input, as well as a multiple switch with an indicator at the input, while the pulse distributor made in the form of a series-connected pulse counter, a counting input connected to the input of a pulse distributor, a multiplexer and a decoder, the output of which is distributor, first latch output is connected to the input of the selector switch, the output connected to the control inputs of the multiplexer, the frequency divider input is connected to the pulse generator and the second input of the first trigger - with output of the second flip-flop. 2. The device according to claim 1, which is based on the fact that the outputs of the keys are connected to the inputs of the heaters through the respective series-connected phase setting blocks and triac actuators, each phase setting block made in the form of two adjustable resistive circuits, the outputs of which are combined and connected to the output of the block, and their inputs through the switch connected to the power source, while the control input of the switch is the input of the phase setting block. 1485214 n outs fig.Z