SU959095A2 - System for automatic control of hopper charging - Google Patents

Description

The invention relates to automatics and can be used to simultaneously load one bunker into bunkers of raw fuel in thermal power plants.

According to the main author. St. No. 389509 is a well-known automatic control system for the loading of bunkers, which contains a device for blocking the lifting of one-lobe plow jumpers, logic blocks, information processing devices and selection of bins for loading and a central computer 1.

The disadvantage of this system is the ability to control the plugs for dumpers and to perform the alternate loading of only one bunker from among the bins to be loaded.

The aim of the invention is to expand the functionality of the system.

The goal is achieved by introducing a capacity limiter, a subsystem switching unit, a section selection unit and n section control units, the first inputs of which are connected to the outputs of the switching blocks of the loaded hoppers of the corresponding subsystem, and the second inputs with the corresponding outputs of the unit. section selection, and exits. - with inputs of control units of loading devices, the first inputs of the switching unit of the Subsystems are connected to the outputs of the lower level sensors, the second inputs are connected to the outputs of the upper level sensors, the third inputs are from

10 inputs of blocks for determining the end of the cycle of filling of bunkers, and outputs with corresponding inputs of a capacity limiter and a block for selecting sections and with inputs of switching units for loading hoppers of the corresponding subsystems.

The proposed system consists of n independent subsystems. Each subsystem is assigned a specific

20 number of bins. The subsystems independently from each other select and load fixed bins.

Work subsystem with multi-boot devices. You complete the condition of simultaneous loading into p bins from one conveyor provided by the simultaneous operation of the subsystems, the condition for the independence of the loading process of each of the n simultaneously loaded bins, auto

the functionality of the subsystems, the use of p sectional boot devices.

FIG. 1 shows a functional system diagram.

The system contains blocks 1-switch-over of loadable bunkers, switches 2, blocks 3, storing the order of requests, blocks 4 times of backfilling, device 5 blocking backfill of bunkers, devices b blocking} 0 lifting, loading devices, blocks 7 reducing the time of landing , blocks 8 for determining the end of the cycle of filling of Onunkers, blocks 9 for automatic switching on the system of breakdown, blocks 10 jj for communication with the control library, blocks 11 for monitoring the operation of logic, blocks 12 for controlling the execution of commands, sensors for the lower level 13, sensors for the upper level 14 the fuel on the belt 15, the position sensors of the loading devices 16, the section control units 17, the subsystem power up unit 18, the capacity limiter 19 and the section selection unit 20. . . : .. :; . . ..

FIG. 2 graphically represents a flow diagram of a system with 3 subsystems, and FIG. 3 is a functional block diagram of the section control unit 17, which consists of elements 21-29, the reschizukai function and; in fig. 4 is a functional diagram of one of the n channels of the 6-1 18 switching-on subsystems. The circuit contains an element 30 that implements the I1Sh function, an RS flip-flop 31, a converter 32 of discrete 35 signals from high-level sensors. it into a proportional back-level signal and an analog signal comparison element 33.

FIG. 5 shows the functional 40 on the limiter circuit 19. The circuit contains a converter 34 of discrete signals, a proportional analog signal and two elements 35 and 36 of the comparison of analog signals.

FIG. b the functional diagram of the section selection block 20 is presented. The diagram contains elements 37 and 38 that implement the NOT functions, element 39, REA LIZING the OR function, and elements 40-43 f implement the functions I.

The system works as follows: "...

The total number of bins is distributed equally among the subsystems. 55

The subsystems are put into operation by the unit 18 on the state of signals from the high level sensors (blocks 14) and the low level sensors. (blocks 13). Permission to work is given from the subsystem under one of the following conditions: the presence of at least one empty bunker, or the presence of a specified number of bunkers with a fuel level below the top pins of the upper level sensor. 65

The signals to allow the subsystems to work go to the blocks of 1 subsystems, as well as to blocks 19 and 20.:

Depending on the number of included drive systems, limiter 19 generates commands to the performance controller to set the appropriate performance of the conveyor.

During operation of all n subsystems, Q / n of fuel is poured into each of the loaded bunkers, where Q is the full capacity of the conveyor. When each subsystem is turned off, the performance of the pipeline decreases by Qjh.

FIG. 2, for example, is a flow chart of loading b-unkers, where the automatic control system contains three subsystems. On each bunker there is one unloading device, which has three sections (a, b, c).

Example 1. During the operation of one subsystem from p (I), one bunker is loaded from m by lowering three sections (.3, c, c) of the discharge device, i.e. the entire conveyor belt overlaps.

Example 2. During the operation of two subsystems of n (| and I1), two bunkers from m are loaded by lowering five sections (a, b and a, b, c) of one unloading device partially, and the second one completely.

Example 3. When three subsystems from n (I, I I and ill) are operating, three bunkers from m are simultaneously loaded by lowering six sections. The conveyor belt in this case is overlapped with sections a, a, b and a, b-, c-two discharge devices, partially and third completely.

Depending on which subsystems are turned on, block 20 selects certain numbers of boot device sections to control each subsystem. The signals permitting the work of the sections are sent to the block. And the blocks 17 allow the passage of commands to lower only those sections of the boot devices that are selected by the block 20.

Commands for lifting sections are formed by blocks b using a signal common to all sections.

At the end of the loading of the bunkers, a subsystem from block 8 of this subsystem sends a signal to block 18, which prohibits the operation of this subsystem and changes the control signals to blocks 19 and 20.

In blocks 17 (Fig. 3) on. each boot device includes three elements 21-23, 24-26, etc. (according to the number of sections) implementing functions I.

Claims (2)

In case of choosing any bunker for loading from block 1, signal 1 is sent to the first inputs of the corresponding elements AND of the corresponding bunker. The second inputs of the elements And from block 20 receives signals 1, allowing lowering of the selected secDdy of the same bunker. Coincidentally, on the element AND of these two signals, a command to lower the sections is formed. In block 18 {FIG. 4) signals from sensors 13 of the lower level, after being processed by element 30, arrive at the first S input of trigger 31. When an empty bin appears at one of the inputs of the OR element and, accordingly, an output 1 appears at the output. On this signal, a trigger is thrown and Signal 1 appears at its output, which enables the subsystem to operate with an empty bin. Signal 1 at the output of the trigger holds off until a signal 1 arrives at L from block 8.,. The input of the converter of discrete signals (DAC) 32 receives information from the upper level sensors 14. The converter outputs to the input of the reference element (comparator) 33 an analog signal proportional to the number of bins, the fuel level in which is below both pins of the upper level sensors. To the second input of the element 33 an analogue signal rt of the unit of the number of such bunkers is received. If both signals are equal or greater than the signal from element 32 of element 33, signal 1 is formed, the input of the trigger to the second S which flips it, and the subsystem is allowed to work. Thus, the subsystem is involved in the operation when at least one empty bunker or a predetermined number of non-filled bunkers appears. / In limiter 19 (Fig. 5), the element 34 converts discrete signals permitting the operation of subsystems to a proportional analog signal. This signal is fed to the first and second inputs of elements 35 and 36, respectively. The second and first inputs of these elements, respectively, receive a tax signal from the material feed capacity sensor. If the performance of MeHbtde is what is required; then element 35 forms the controller command to increase the performance of the pipeline. If the capacity is greater, element 36 is put into operation and generates a signal to reduce the capacity. In block 20 (FIG. 6), the elements that implement the AND, OR, and NOT functions determine the choice of the number of sections controlled by each subsystem in accordance with the technological scheme of operation shown in FIG. 2.. The use of the invention for loading bunkers of a thermal power plant increases the loading efficiency and reliability of operation of the boiler units. The invention The system of automatic control of the loading of bunkers according to auth.St. 389509, characterized in that, in order to expand the functionality of the system, a performance limiter, a subsystem switching unit, a section selection unit and n section control units, the first inputs of which are connected to the outputs of the switching units of the loaded bins of the corresponding subsystem, are introduced into it , the second inputs - with the corresponding outputs of the section selection unit, and the outputs - with the inputs of the control unit of the loading devices, the first inputs of the powering unit of the subsystems are connected to the outputs of the lower level sensors, the second inputs to the outputs of the sensors of the upper layer, the third input - to determine the output end of the filling cycle blocks bins and the outputs - to the corresponding inputs and performance restrictor sections selecting unit and the inputs of the switching units loaded bins corresponding subsystems. Sources of information taken into account in the examination 1. USSR author's certificate 389509, cl. G About F, 15/46 (proto, type). Bflot lf tff 1 - kdnandy t seksii I «V zshdzony) yy | yc / ffffffucfff / j, l.il-ll -I one H 5s - :: y eleven g 3 sk it eleven i blog (18 Dm 5/10 K a 18 1-signal, resolving paSomomb under O from 5ta18 -signal, teit (dot subsystem J 1/11 Sekii and c V Section b III “Paragraph 1 V t and II til QQ cb b d. mi-fc l with Sec14i C 1 II. §