SU1471940A3 - Routine of controlling and monitoring the operation of one or several worm-screw presses in processing of plastics - Google Patents

Abstract

The invention relates to an apparatus for monitoring the work and control of extruders and series of extruders in the processing of plastics, which includes a controlled display unit (1), a control unit provided with push buttons (2, 3, 4), and a selector (5), which is connected by coupling units (6, 7, 8) to sensors connected to an extruder (12) and/or an associated machine and is equipped with a central computer (104, 501). The essence of the invention is that three selector units, designed as push buttons (2, 3, 4), for determining a group of parameters of a parameter belonging to the group and the value of the parameter are provided, which is connected on the one hand to the central computer (104) of the display unit (1) and on the other hand to the central computer (105) of the selector (5). The invention can achieve the effect of simplifying operator control and reducing the number of intervening units. <IMAGE>

Description

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meter (using selector .2). The selector 2 is connected to the elements 6-8 connection, and through them - with matching blocks 9-11, with a chain of blocks. current, the latter can be used to emit error signals and are connected to the operating condition sensors (not shown in Fig. 1). The sensors are connected to a screw press 12 or a number of screw presses. The controlled indicator unit 1 (Fig. 2) is connected via a central computing device 13 with buttons 3-5, as well as matching units 9-11, which have a blocking current circuit, or, respectively, with error generators of the latter. In addition, indicator unit 1 has at its input a storage device 14, a central computing device 15, as well as an operating current circuit 16 and a display 17 placed at the output of the operating current circuit 16 for rewriting the information displayed on it. Thus, the central computing device 13 has an input for transmitting error signals and an output for transmitting the operational current to the circuit 16 of the information corresponding to the error signals. A coupling element 18 is provided at the input of the selector 2, and a central computing device 19 is provided at the output, and a storage device 20 is located between them. The central computing device 19 of the selector 2 is connected to buttons 3-5. The selector 2 current circuits are designed to group information transmitted via communication elements 18. Memorizing device 20 provides temporary accumulation of information or the transfer of grouped information 1 SCH in a predetermined sequence into the control current circuit 16 of the controlled indicator block with an output to display 17. Moreover the central computing device 19 of the selector 2 is equipped with a current circuit for cyclically selecting the information accumulated in the storage device 20 of the selector 2 which is used to determine parameter groups selected parametg moat and parameter values by pressing the respective keys 3 - 5. An error generator, 940, can be built into matching .9 – П matching blocks with a blocking current circuit.

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ki (Fig. 3), which takes the corresponding reference and actual values of the adjustable parameter reference signal A and output signal B in the adder S, the output of which is connected to the electronic control unit S1 control for the signal necessary to change the actual value. Using said electronic control unit S1, control signal C is transmitted to power switch S2, as well as the first comparator. The signal corresponding to the actual value of the parameter, leaving the measuring unit S4, is sent to the sampling unit Ml, as well as the second comparator M4. The output of the power switch S2 is connected to the regulator S3, as a result of which the value of the controlled parameter is set by the regulator N.

The signal corresponding to the actual value at the output of the sampling unit Ml is summed up in the adder M7 and fed to the third comparator, the MV. The first and third comparators are connected via a controllable switch MB k of the circuit OR M5, the output of which affects the source D of the error signals. The error signal source D may be connected to other OR M5 circuits in accordance with other adjustable parameters. The control switch may, for example, consist of two AND circuits connected to each other, as well as an OR circuit receiving the output signals of the I circuits. The error signal generator operates in such a way that the error signal occurs when the actual value deviates from the set value exceeds a certain limit value.

The scheme works as follows.

The sensors included in the worm press 1 2 and devices attached to it form the corresponding signals and send them to matching units 9-11, which have a blocking current circuit and are connected to the selector 2 by means of communication elements 6-8. Compatible blocks 9 - П with a blocking current circuit (their number corresponds to the number of sensors and co-fits mostly more than three) have error signal generators which, in the event of undesirable

The states of operation of the press 12 give an error signal to the controllable indicator unit 1. The error signals are received by the central computing device 13 and are processed by it. As a result, a command is given, and the corresponding information is called up on the display 17 of the indicator unit 1. When the error signals are displayed, the image on the display 17 should be changed completely, and the indicated error signals can be displayed intermittently. At the same time, if necessary, a controlled indicator unit can give an alarm in the form of a light or an acoustic signal.

The information collected by the sensors is shown when there is no error signal in the specified manner in the specified sequence on the display 17.

The operator has the option, if necessary, to change the parameter values to select a group of parameters by pressing button 3. A similar group of parameters may, for example, include temperature readings in individual sectors of the press 12. The next step is to select the parameter that needs to be changed. This parameter may be, for example, the temperature in one of the sectors. This selection is made using button 4, and using button 5 you can set the temperature in the selected sector within the specified range of values. It is preferable to program the central computing device in such a way that it continuously displays the cycle of the required groups, parameters and adjustable values. Indications should be made periodically in order to be able to determine the necessary values, parameters. Thus, it is possible to very efficiently adjust the processing parameters of plastics. Scheme maintenance does not require special knowledge.

The proposed scheme can be connected in a known manner with blocks to set the desired values of the controlled parameters, which contributes to the organization of effective control. It has a small number of regulatory bodies, as a result of which it is possible to carry out effective control with a high degree of reliability while limiting the possibility of generating payloads and immediately issuing error signals that can be made by service personnel.

Claims (5)

1. Scheme for controlling the operation and control of the screw press and a series of screw presses during plastics processing, comprising a controllable indicator unit, equipped with buttons, a regulating unit, a selector, connected through working elements to working condition sensors connected to a series of worms presses, and equipped with a central computing device, characterized in that, in order to simplify maintenance by reducing the number of regulatory bodies, the controllable indicator unit is equipped with a central computing device, and the buttons are made in the form of three selective blocks for defining a group of parameters, a parameter included in this group and a parameter value of the selected parameter, the selective blocks being connected on the one hand to the central computing device of the controlled display unit, and on the other hand central computing device selector. 2. The circuit according to claim 1, wherein the controllable indicator unit is provided with an operating current circuit and a display unit controlled by a central computing device, the central computing device having an input for transmitting error signals and an output for transmitting the operating current to the circuit error signals of information, where the operating current circuit is connected to the input of the display for overwriting the information shown on it. 3. Scheme popp. 1 and 2, characterized in that the central computing device of the selector is provided with current circuits for grouping information transmitted through communication elements and a memory device for temporarily accumulating information or transmitting grouped information in a predetermined sequence into the operational current circuit of a controlled indicator unit with an output on display. 4. Scheme on PP. 2 and 3, characterized in that the operating current circuit through the central computing device of the controlled indicator unit is connected to the outputs of matching blocks, which are equipped with a circuit, for transmitting error signals, with matching blocks equipped with a blocking current circuit and connected to sensors of a number of presses. 5. Scheme on PP. 1-4, characterized in that the central computing device of the selector is equipped with an electrical circuit for cyclically selecting information accumulated in the memory of the selector for defining groups of parameters, individual parameters and parameter values by means of the corresponding buttons of the regulating unit. 12 at - P