SU874670A1 - Device for control of charge loading in glass smelting furnace - Google Patents

Description

(54) DEVICE OF CONTROL OF LOADING OF THE DIRECTION IN A GLASS FURNACE

The invention relates to the glass industry and can be used in processes related to the charge loading in glass melting furnaces. A device is known for controlling the charge loading in glass melting furnaces containing a level sensor and a control circuit, the process control of which is carried out as follows. First, the depth of the web-clomas in the furnace is determined and a signal is generated that is proportional to the depth of the glass melt. Then a signal is generated that is proportional to the time of full charge loading with a single charge. After that, a signal is generated that is proportional to the time between two successive charges of the charge and is related to a signal proportional to the depth of the glass mass. Such a signal corresponds to the time required for the glass melt depth in the furnace core to remain constant. Then a control signal is generated that is proportional to both the signal corresponding to the full load time of the charge with a single charge, and the signal corresponding to the time between two consecutive charges of the charge glass surface. The charge is filled in equal portions at regular intervals, and the charge is not charged in the intervals between backfill. The frequency of charge charge is determined by a control signal that determines the depth of the glass melt layer, which should remain constant. In this case, the s-chargeable charge forms a layer of small thickness on the surface of the glass melt. This layer is formed in a time equal to 1% of the time between two loads. The device allows the charge to be loaded into the furnace 1.1 with a high degree of uniformity and accuracy. However, the loading is performed in a continuous layer, as a result of which the primary melt is formed prevents the deep layers of the charge from boiling, since it has a low heat transfer coefficient. This significantly reduces the rate of glass melting. Closest to the present invention, there is a charge control device for a glass melting furnace containing a charge loader with a drive

house and switch and level adjuster 2.

A disadvantage of the known device is that it does not ensure the uniformity of the supply of portions of the charge over time and, accordingly, causes the random nature of the gaps between the heights (portions) over the glass mass mirror. This is a violation of the thermal regime of the furnace and the overheating of the glass melt in individual parts. In addition, the device does not give a real idea of the heat absorption of glass melt. In view of this, the system for distributing the charge over the area of the cooking basin is at least inaccurate, if not accidental. The most significant drawback of the device is that it practically does not provide automatic adjustment to the required loading mode, although it provides for the loader to operate in conditions of varying thermal conditions of the furnace.

The purpose of the invention is. increase control accuracy.

This goal is achieved by the fact that a device containing a charge loader with a drive and a switch and a level adjuster is equipped with a MEMORY element, a counter with a setting device, a time relay, a setting device, a reverse unit, four logical elements AND, a logical element OR, a delay element, a trigger, two inverters , a drive with a control unit and a limit switch, and the level sensor is made in the form of a two-arm rotatable in the vertical plane, at one end of which an electrode is fixed, and on the other - an adjustment screw, with what is the limit switch connected to the input of the first inverter and one of the inputs of the first element And, the output of which is connected to one input of the second element And the first element OR, the output of which is connected to the inputs of the delay element and the trigger, the output of which is connected to another input of the second element And one of the inputs of the third element And, the output of the delay element is connected to the corresponding inputs of the second and third elements And, the outputs of kOTOpHx are connected to the corresponding inputs of the block of the reverse, the output of which is connected through the setting device with the input of the time relay, the output of which is connected to one of the elements of the memory and the counter, the other input of the counter is connected to the limit switch, the input of the control unit is connected to the time relay, the output of the counter and the other input of the memory element, the output of which is different the input of the first element is And, the input of the second inverter and the limit switch are connected to the level sensor, which is kinematically connected to the drive, and the outputs of the inverters are connected to the corresponding inputs of the fourth element And, output cat orogo is connected to the other inputs of the element OR and the third element I.

The drawing shows a functional diagram of the device.

The device contains a glass melting furnace 1 with a cooking basin 2. A charge loader 3 is installed above the charging pocket of the cooking pool, consisting of a water-cooled shovel table 4, moved onto rollers1X 5 by means of a reciprocating movement actuator 6. The initial position of the shovel table 4 is controlled by the switch 7. A feed bin 8 of the charge 9 is placed above the shovel table 4 loaded onto the surface of the grounded glass mass 10 in the form 11, in the wall of the working part of the furnace 1 there is a niche 12 with a hole in the bottom. At the level of the middle height of the niche 12 on the support 13, the rod 14 is pivotally mounted isolated from the mass, made of heat-resistant material. The end of one arm of the rod 14 is passed into a niche and has a hole in which, using screw 15, a heat-resistant electrode 16, which is freely lowered into the hole of the bottom of the niche, is fixed and can be contacted with a grounded glass mass, in particular, with its surface. Above the end of the other arm of the rod 14 is fixedly mounted to interact with the rotation of the rod with an adjusting screw 17 screwed into the rod, a precision end switch 18 with a grounded input, which, in combination with the adjusting screw, forms the glass melter level adjuster. The rotation of the rod 14 is carried out using an eccentric 19, rotated by the drive 20. The device also contains inverters 21 and 22, elements AND 23 and 24, element OR 25, trigger 26, delay element 27, elements And 28 and 29, reverser block 30, unit 31, time relay 32, pulse counter 33 with unit 34, the MEMORY element 35 and the control unit 36 with the actuator 20 of the eccentric 19.

The device works as follows.

Claims (2)

After pre-welding of the glass melt 10 in the cooking pool 2 of the furnace 1 to a level close to the required one, the puller 34 sets the size of the pile 11 loaded onto the surface of the glass melt of the charge 9. The amount of the charge in the bar is determined by the number of filling the charge with a shovel table 4 of the loader 3 for the cycle of the device. Approximately, using the time setter 31, set the distance between the charge chambers 11, which is proportional to the pause in the operation of the loader 3 per cycle of the device operation by means of the adjusting screw 17 This sets the level of the glass melt 10 in the cooking pool, which must be maintained during the production of the glass melt. After that, the load control device is switched on to the first input of the MEMORY 35 element, a starting signal is given, which includes this element and simultaneously resets the 33 pulse count to zero. Turning on, the element MEMORY 35 output signal includes a drive 6 of the reciprocating moved table-shovel 4, moved on rollers 5 from the initial position to the loading pocket of the pool 2 of the furnace 1. In this case, the charge 9 from the feed bin 8 fills the surface of the table-shovel with an even layer four . When the shovel table 4 is moved back, the charge from the e, th surface is poured out onto the glass melt 10, forming a group of 11 Having reached the initial position,. The table shovel 4 acts on the limit switch 7 and turns it on, and a signal appears at its output, which is fed to the counting input of the pulse counter 33 and is taken into account. This completes the cycle of the loader 3 to perform one charge charge in block 11, The grid may consist of one, two or more charge charges, the amount of which in each particular case is determined experimentally, based on the highest cooking rate of the glass melt. For example, it has been established that the highest rate of melting of the glass melt is achieved, ceteris paribus, with the size of the pile, consisting of three charge charges. With this in mind, the setting device 34 of the pulses sets the pulse counter for the accumulation of three pulses to the pulse counter 33. As a result, the loader 3 of the charge1z1 conducts without stopping three chargeings of the charge onto the glass mass in one pile, and the limit switch 7 controlling the initial position of the shovel table 4 gives the counting input of the counter 33 pulses three signal pulses. Once the counter 33 pulses are locked : T specified amount of charge charge in the group, on. its output by Wits is a signal arriving at the inputs of the MEMORY 35 element and time relay 32. This signal turns off the element MEMORY 35 and turns on the relay 32 time. Accordingly, the element MEMORY 35 switches off the drive 6 of the reciprocating movement of the loader 3 and the charge loading is stopped for a time equal to the time delay of the on-time relay 32. the time delay of the relay; 32 times corresponds to a pause in the work of the loader 3 of the charge. In proportion to this time, the pile 11 of the specified number of charge bedding, under the influence of the glass mass flows 10, moves towards the cooking zone for a certain distance, freeing up space for the subsequent pile. This distance in the process of continuous operation is established automatically by monitoring the level of the glass mass in the extracted part of the furnace 1 during the pause in the operation of the charge loader and according to the results of monitoring and the corresponding adjustment of the time delay of the time relay 32. This is done as follows. Simultaneously with the switching off of the element MEMORY 35 and the activation of the time relay 32, the signal from the output of the pulse counter 33 turns on the control unit 36 for the drive 20 of the eccentric 19, and it, in turn, turns the output signal on the drive 20, through which the eccentric 19 rotates and makes one turnover. After that, the control unit 36 and the actuator 20 are automatically turned off, as a result of which the rod 14 is isolated from the mass and performs a full cycle of oscillatory motion, turning from the initial extreme position (shown by dotted lines) to the second extreme position and back. When moving to the second extreme position, the electrode 16, passed into the hole in the bottom of the niche 12, reaches the working (measuring end of the glass melt surface, goes deeper into it, forming an electrical contact between the rod isolated from the mass and grounded glass melt 10. Electrical contact In order to control the operation of the charge loader 3, signals obtained only during the forward stroke of the rod 14, i.e. the moment of contact of the contact created by the electrode and the grounded glass mass, as well as the moment of opening, are used. contact of the precision limit switch 18 under the action of the adjusting screw 17 screwed into the opposite end of the rod 14. During the forward stroke of the rod, a comparison is made in time to the contact of the surface of the molten glass 10 by the electrode 16 with a constant opening torque of the precision limit switch 18 previously specified by the adjusting screw. volume 17, i.e., the initial level here is the glass mass level 10. Suppose that the glass mass level is lower than the specified one. In this case, the adjusting screw 17 reaches the precision limit switch 18 earlier and opens its contact than the electrode 16 reaches the surface of the grounded glass mass. As soon as the contact of the precision limit switch 18 opens, the single signals connected to its output, the first element I 23, and the input of the inverter 21 are formed (until the contact opened, they were connected to the grounded input of this switch). At that time, there are also single signals on the connected to the bar, the second input of the element I 23 and the inverter 22, since the bar 14 is isolated from the mass, and the electrode 1-6 has not yet touched the glass melt. Thus, at the output of the element 23, a signal appears that is equal in duration to the time of rotation of the rod 14 from the precision limit switch at one end to the surface of the glass melt at the other. At this time, the output of the element 24 for shaping the signal does not occur, since its inputs are fed with zero signals from the outputs 21 and 22 of the inverters, to the inputs of which single signals are supplied. The signal from the output of the element AND 23 is fed to the input of the element AND 28, and through the element OR 25 to the input of the trigger 26 and the input of the element 27 with an adjustable delay time. The trigger 26 switches to another steady state, in which, at its output connected to the inputs of the elements 28 and 29, a single signal takes place. After a predetermined delay, which determines the insensitivity of the device, a single signal also appears at the output of element 27 connected to the inputs of elements 28 and 29. Thus, with a full set of input single signals at the output of the element 28, a signal appears which, at the input to the reverser unit 30, turns it on, and it, in turn, turns on the reversing drive of the time setting 31 time relay 32 time. The amount of time by which the time delay setting is changed depends on the difference in the glass mass level between the set value and the actual value. The greater this difference, the longer the time at a constant rotational speed of the eccentric 19 rotates the rods 14 from the moment of opening the contact of the precision limit switch 18 until the moment of the electrode 1 on the glass mass 10, the reversing drive is turned on for time sensor 31 and the longer the time delay of the time relay 32 varies. At the time of the transfer of the electrode of the electrode 16 to the glass melt 10, the signals at the input of the inverters 21 and 22 connected to the rod 14 are reduced to zero. For this reason, the signals at the outputs of the And 23 and 28 elements disappear, the reversing unit 30 is turned off and the time actuator reversing drive 31 stops. This completes the correction of the pause time in the operation of the charge loader 3 per device operation cycle. When the eccentric 19 is rotated 180, the rod 14 reaches the second extreme position and the electrode 16 deepens to the maximum depth. The forward stroke of the rod 14 ends with this. When the eccentric 19 turns from .180, the rod 14 returns to its original position. In this case, the contact between the electrode 16 and the surface of the grounded glass melt 10 is first opened, and then the contact of the precision end switch 18 is closed. During this time interval, as in the forward stroke of the rod 14, at the output of the first element 23 there is a single signal that through the element OR 25 switches trigger 26 to an initial steady state, in which the signal at its output is zero. Therefore, at the output of the element And 28 there is no signal and. Timed correction of the time delay of the time relay 32 does not occur. When the rod 14 returns to its original position, the actuator 20 is turned off and the eccentric 19 stops. In the event that the glass mass level 10 in the cooking pool 2 is greater than the set point, then during the forward stroke of the rod 14, the electrode 16 reaches the surface of the grounded glass mass earlier than the contact of the precision limit switch 18 is opened. and the input of the inverter 22 connected to the rod 14 is reduced to zero. At this time, the signals at the input of the element And 23 and the input of the inverter 21 are also zero, since these inputs are connected via a closed contact of the precision limit switch 18 to ground, in this case a single signal takes place already at the output of the element 24, since the inputs This element receives individual signals from inverters 21 and 22, the inputs of which are grounded. The signal from the output of the second element And 24 is fed to the input of the element And 29, and through the element OR 25 to the counting input of the trigger 26 and the input of the element 27 with adjustable time Zszherzhka. The trigger 26 switches to a second stable state in which at its output, connected to the inputs of the elements 28 and 29, there is a single signal. After a predetermined delay at the output of the element 27, connected to the inputs of the elements 28 and 29, a single signal also appears. Thus, on all the inputs of the And 29 element there are single signals that cause the appearance of a signal at its output. This signal, being fed to the input of block 30 of the reverse, turns it on, and it, in turn, turns on its reverse signal drive of the time sensor 31 by its output signal, but already in the direction of increasing the time delay of the time relay 32. Here, as in the first case, the magnitude of the time delay correction time relay depends on the magnitude above the level of the glass mass in the cooking basin 2 with respect to the specified value. Further, the processes for generating a correction signal are similar to the first case. If the level of the glass melt 10 is equal to the set point, the instant of opening the contact of the precision limit switch 18 coincides with the instant of closing the electrode 16 onto the glass melt. In this case, at any moment in time one of the inputs of the And 23 and 24 elements has zero signals and, accordingly, the formation of single correction signals does not occur at the outputs of these elements. With small deviations of the glass mass level from the specified formation of correcting pulses for changing the time delay, the relay 32 times occurs only when the duration of the signals at the outputs of the And 23 and 24 elements is longer than the delay time of the element 27 with an adjustable delay time. By changing the time delay of this element, the dead zone of the device is regulated when a correction impulse is generated to wear out the time delay of the time relay 32. As soon as the time relay 32 counts the preset time delay (taking into account the adjustment time of the job by measuring the level of the glass melt), a signal appears at its output, which includes the element MEMORY 35 and resets the pulse counter 33 to zero. As a result, the signal at the output of pulse counter 33 disappears and time relay 32 is turned off. The MEMORY element 35 by the output signal turns on the drive 6 for the reciprocating movement of the loader 3 of the charge and starts loading the charge on the surface of the glass melt 10 with the formation of a new group with a predetermined number of backfill. Thus, the proposed device automatically adjusts to the desired charge loading mode. This speeds up the process of boiling the steel, since the device ensures an accurate and uniform supply of the charge to the glass melting furnace. Claims of the Invention Control device for loading the charge into a glass melting furnace containing a charge loader With a drive and a switch, and a level adjuster, characterized in that, in order to improve the control accuracy, it is equipped with the element MEMORY, counting with setting unit, time relay, sensor, reverser , the four AND logic elements, the OR logic element, the delay element, the trigger, two inverters, the drive with the control unit and the limit switch, and the level sensor is; not in the form of a two-armed lever rotatable in a vertical plane. At one end of which an electrode is fixed, and on the other - an adjusting screw, with the limit switch connected to the input of the first inverter and one of the inputs of the first element And, the output of which is connected to one input of the second element And and the first OR element, the output of which is connected to the inputs of the delay element and the trigger, the output of which is connected to another input of the second AND element and one of the inputs of the third AND element, the output of the delay element is connected to the corresponding The main inputs of the second and third elements are And, the outputs of which are connected to the corresponding inputs of the reverse unit, the output of which is connected to the input of a time relay through the setting device, the output of which is connected to one of the inputs of the MEMORY element and the counter, the other input of the counter is connected to the final switch connected to a time relay, a meter output and another input of the MEMORY element, the output of which is connected to the charge loader drive, another input of the first element AND, the input of the second inverter and the limit switch are connected with a sensor that is kinematically connected to the drive, and the outputs of the inverters are connected to the corresponding inputs of the fourth AND element, the output of which is connected to the other inputs of the OR element and the third element I. Sources of information taken into account in the examination 1.US. Patent No. 3897232 , cl. 65-29, 1975. 2. USSR author's certificate number 430073, cl. From 03 to 3/00, 1972 (prototype). five " "S1 N1 g S "M