CN111459195A - Liquid level measurement control device and method for waste incineration slag discharging machine - Google Patents
Liquid level measurement control device and method for waste incineration slag discharging machine Download PDFInfo
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Abstract
A liquid level measurement control device and method for a waste incineration slag discharging machine belong to the technical field of machinery. Comprises a liquid level measuring instrument and a liquid level control device; comprises the following steps; the liquid level measuring instrument adopts a non-contact radar liquid level meter, outputs a high alarm switch signal, a low alarm switch signal and a low alarm switch signal according to the measured liquid level, is connected to a liquid level control electric cabinet through hard wiring, and carries out delay 10 seconds processing through a delay relay, and the processed signals are used for indication and alarm of a panel of the electric cabinet and also used for automatic control of the liquid level; the manual control step and the automatic control step of the liquid level of the slag extractor are realized by the electric cabinet of the liquid level control device, the manual control step is operated by a button on a panel of the electric cabinet, and the automatic control step is to process signals according to the high and low liquid levels to realize the automatic water replenishing of low start and high stop.
Description
Technical Field
The invention relates to a liquid level measurement control device and method for a waste incineration slag discharging machine, and belongs to the technical field of machinery.
Background
The slag that the domestic waste burns and produces passes through the chute and gets into the mucking machine, and the mucking machine generally adopts the water seal form, guarantees the interior negative pressure of incinerator, makes the high temperature lime-ash that drops realize quick cooling simultaneously.
The water seal medium of most domestic waste incineration plant slag dischargers in China is plant tap water, and because the slag discharge amount is large and the temperature is high, the water consumption is also large, and a large amount of water resources can be wasted. The water seal liquid level measuring instrument of the slag extractor is in a form of a liquid level measuring instrument, wherein Japanese Perilla frutescens incinerator manufacturers adopt an electrode type liquid level switch, Belgium Westges manufacturers adopt a differential pressure type liquid level meter, but ash and water are mixed to form sludge which is easily attached to a measuring diaphragm of an electrode or a differential pressure transmitter to cause inaccurate liquid level measurement; and the frequent falling of ash and slag pushing by the slag extractor easily cause the large fluctuation of the liquid level, thereby causing the inaccuracy of measurement and liquid level control. The electric cabinet of the liquid level control device on the spot of the slag discharging machine generally has only a manual operation function, and cannot realize an independent liquid level automatic control function. Therefore, better optimization methods are needed for the selection of the form of the liquid level measuring instrument and the functions of automatic control and on-site indication of the liquid level control device.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a liquid level measurement control device and method of a waste incineration residue discharging machine.
A liquid level measurement control device of a waste incineration slag extractor comprises a slag extractor, a radar liquid level meter and a liquid level control device, wherein the slag extractor is connected with an electromagnetic valve and a slag extractor water tank, the slag extractor water tank is connected with the radar liquid level meter of a liquid level measurement instrument, and slag and fly ash generated after waste incineration of the slag extractor are pushed out to a slag pit through the slag extractor; the slag extractor water tank is communicated with a slag extractor and is used for installing and measuring a radar liquid level meter; the radar liquid level meter measures the liquid level of the slag discharging machine water tank; the electromagnetic valve is used for replenishing recycling concentrated water for the slag extractor, and the liquid level control device is connected with the electromagnetic valve and the liquid level measuring instrument.
A liquid level measurement control method of a waste incineration slag discharging machine comprises a liquid level measuring instrument and a liquid level control device; comprises the following steps; the liquid level measuring instrument adopts a non-contact radar liquid level meter, outputs a high alarm switch signal, a low alarm switch signal and a low alarm switch signal according to the measured liquid level, is connected to a liquid level control electric cabinet through hard wiring, and carries out delay 10 seconds processing through a delay relay, and the processed signals are used for indication and alarm of a panel of the electric cabinet and also used for automatic control of the liquid level; the electric cabinet of the liquid level control device realizes two control modes of manual and automatic control of the liquid level of the slag extractor, wherein the manual mode is operated by a button on the panel of the electric cabinet, and the automatic mode is to process signals according to the high and low liquid levels to realize low-start high-stop automatic water supplement.
The invention has the advantages that the accurate measurement of the liquid level and the stable automatic control of the liquid level are realized by improving the form of a liquid level meter, filtering a liquid level switch signal and designing the electrical principle of an electric cabinet aiming at the inaccurate liquid level measurement of a waste incineration slag discharging machine and incapable of realizing the automatic water replenishing control on the spot, a set of independent, reliable and high-automation-degree device is formed, the workload of factory production personnel is greatly reduced, and the working efficiency is improved.
The measuring instrument adopts a radar liquid level meter, and has the advantages of non-contact type, high precision, small measuring dead zone, small transmitting angle, convenient maintenance and simple operation.
Drawings
A more complete appreciation of the invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein the accompanying drawings are included to provide a further understanding of the invention and form a part of this specification, and wherein the illustrated embodiments of the invention and the description thereof are intended to illustrate and not limit the invention, as illustrated in the accompanying drawings, in which:
FIG. 1 is a schematic view of a waste incineration mucking machine process system of the present invention;
FIG. 2 is a panel view of the fluid level control apparatus of the present invention;
FIG. 3 is a first electrical schematic of the fluid level control apparatus of the present invention;
FIG. 4 is a second electrical schematic of the fluid level control apparatus of the present invention.
The invention is further illustrated with reference to the following figures and examples.
Detailed Description
It will be apparent that those skilled in the art can make many modifications and variations based on the spirit of the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element, component or section is referred to as being "connected" to another element, component or section, it can be directly connected to the other element or section or intervening elements or sections may also be present. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art.
The following examples are further illustrative in order to facilitate the understanding of the embodiments, and the present invention is not limited to the examples.
Example 1: as shown in fig. 1, 2, 3 and 4, the liquid level measuring and controlling device of the waste incineration residue discharging machine comprises a liquid level measuring instrument and a liquid level controlling device. The liquid level measuring instrument adopts a non-contact radar liquid level meter, outputs a high alarm switch signal, a low alarm switch signal and a low alarm switch signal according to the measured liquid level, is connected to a liquid level control electric cabinet through a hard wire, and carries out delayed 10 seconds processing through a delay relay, and the processed signals are used for indication and alarm of a panel of the electric cabinet and are also used for automatic control of the liquid level. The liquid level control device and the electric cabinet of the device are installed on the spot of the slag discharging machine, so that two control modes, namely manual control mode and automatic control mode, of the liquid level of the slag discharging machine can be realized, the manual control mode is operated by buttons on a panel of the electric cabinet, and the automatic control mode is used for processing signals according to the high and low liquid levels and realizing automatic water replenishing of low start and high stop.
A liquid level measurement control method of a waste incineration slag discharging machine comprises a manual control step and an automatic control step,
manual control: the manual/automatic change-over switch is turned on manually, a manual solenoid valve button is turned on in a inching mode, the water replenishing solenoid valve is electrified to start water replenishing, the manual solenoid valve button is turned off in a inching mode to stop water replenishing manually, or a high liquid level alarm switch signal is delayed for 10 seconds, a delay relay acts, and the high liquid level protection stops water replenishing;
and (3) automatic control: the manual/automatic change-over switch is turned to be automatic, the low liquid level alarm switch signal is delayed for 10 seconds, the relay is powered on, the water replenishing electromagnetic valve is powered on and opened, water replenishing is started, the high liquid level alarm switch signal is delayed for 10 seconds, the relay is powered on, the electromagnetic valve is powered off, and automatic water replenishing is achieved by low start and high stop.
The manual control step can be used for field debugging and overhauling.
The automatic control step is generally put into use in normal operation of production, and the automatic control of the water seal liquid level of the slag discharging machine is realized through the measuring instrument and the control device, so that the personnel operation is reduced, the production efficiency is improved, and the fault tolerance rate is reduced.
The slag discharging machine is arranged on the spot, so that the operation is convenient; the device power supply is supplied by the UPS, so that the power supply stability is high; the switch signal output by the liquid level meter is subjected to delay judgment in the electric cabinet through a delay relay; the electric control box can realize a manual/automatic control mode, particularly an automatic control mode, of the slag discharging machine on site through an electric loop in the box, so that water supplement of the slag discharging machine can become a set of independent devices with high automation degree and non-manual intervention; the panel of the electric cabinet can realize the functions of manual/automatic switching, manual water replenishing and alarm indication, and the liquid level can output acousto-optic alarm when in abnormal states such as high or low.
The non-contact type slag-liquid separator has the advantages of being free of direct contact with sludge in a water seal, avoiding inaccurate liquid level caused by sludge hanging or sludge blocking, being high in precision, meeting the requirement of a slag extractor liquid level measurement area to be small, being small in measurement dead zone and emission angle, low in requirement on the size of a slag extractor water tank, convenient to maintain, simple to operate, and capable of setting the numerical values of a high-high alarm switch signal HH, a high alarm switch signal H, a low alarm switch signal L and a low alarm switch signal LL and outputting the alarm switch signals.
Liquid level switch signal carries out time delay 10 seconds through time delay relay and handles, and because of the water seal liquid level can be along with the lime-ash falls into or the machine of slagging tap pushes away the sediment and fluctuate by a wide margin, liquid level switch signal also can frequent change, through handling signal 10 seconds time delay, can filter the false signal that causes because of the liquid level is undulant to realize the stable control of liquid level.
Example 2: as shown in fig. 1, 2, 3 and 4, the liquid level measuring and controlling device of the refuse incineration slag tapping machine comprises a slag tapping machine 1, a liquid level measuring instrument and a liquid level controlling device 16. The slag extractor 1 is connected with the electromagnetic valve 4 and the slag extractor water tank 2, the slag extractor water tank 2 is connected with the radar liquid level meter 3 of the liquid level measuring instrument, and slag and fly ash generated by burning garbage in the slag extractor 1 are pushed out to a slag pit through the slag extractor; the slag extractor water tank 2 is communicated with the slag extractor 1, and the slag extractor water tank 2 is used for installing and measuring the radar liquid level meter 3; the radar liquid level meter 3 measures the liquid level of the slag extractor water tank 2; the electromagnetic valve 4 is used for replenishing the recycling concentrated water for the slag extractor 1, and the liquid level control device 16 is connected with the electromagnetic valve 4 and the radar liquid level meter 3.
A panel 15 of the liquid level control device 16 is distributed with a power indicator lamp 5, a manual/automatic change-over switch 6, a manual solenoid valve opening button 7, a manual solenoid valve closing button 8, a solenoid valve opening indication 9, a solenoid valve closing indication 10, a liquid level high and high audible and visual alarm 11, a liquid level high indication 12, a liquid level low indication 13 and a liquid level low and audible and visual alarm 14.
The liquid level control device 16 is provided with an electric cabinet, the power supply of the electric cabinet is supplied by a UPS (uninterrupted power supply), the electric cabinet is provided with a main breaker QF1, one end of the main breaker QF1 is connected with the UPS, the other end L of the main breaker QF1 is connected with a manual opening solenoid valve button 7, a manual closing solenoid valve button 8, a high-high alarm switch signal output endpoint HH, a high alarm switch signal output endpoint H, a low alarm switch signal L output endpoint, a low alarm switch signal LL output endpoint, one end of a first normally opening point KT1.3, one end of a second normally opening point KT2.3, one end of a third normally opening point KT3.3, one end of a fourth normally opening point KT4.2, one end of a first intermediate relay normally opening point KA1.4, one end of a first intermediate relay normally closing point KT 1.5, one end of a first intermediate relay normally opening point KT 1.6, one end of a white power supply indicator lamp H635, one end of the first intermediate relay KA1.4, one end of the first intermediate relay KT 1.4 is connected with a high alarm lamp, one end of a high relay normally opening point KT2.3 is connected with a high alarm relay normally opening point, one end of a high relay normally opening point KT2, one end of a low alarm relay normally opening point is connected with a high relay, one end of a high relay normally opening point of a low relay normally opening point of a high relay, one end of a low relay is connected with a high relay normally opening point of a low relay normally opening point of a high relay, one end of a high relay is connected with a high relay normally opening point of a high relay, one end of a high relay normally opening point of a low relay, one end of a low relay.
The other end N of the device main breaker QF1 is connected with the other end of the first intermediate relay coil KA1.1, the other end of the first delay relay coil KT1.1, the other end of the second delay relay coil KT2.1, the other end of the third delay relay coil KT3.1, the other end of the fourth delay relay coil KT4.1, the other end of the liquid level high audible and visual alarm A1, the other end of the first yellow liquid level high indicator lamp H L1, the other end of the second yellow liquid level high indicator lamp H L2, the other end of the liquid level low audible and visual alarm A2, the other end of the green electromagnetic valve opening indicator lamp H L3, the other end of the red electromagnetic valve opening indicator lamp H L4, the other end of the white power supply indicator lamp H L5 and the other end of the electromagnetic valve V1.
The other end of high alarm switch signal output terminal HH is connected with one end of first time delay relay coil KT1.1, the other end of high alarm switch signal output terminal H is connected with one end of second time delay relay coil KT2.1, the other end of low alarm switch signal L output terminal is connected with one end of third time delay relay coil KT3.1, the other end of low alarm switch signal LL output terminal is connected with one end of fourth time delay relay coil KT4.1, the other end of manual transfer switch SA1 of manual opening solenoid valve button 7 and manual closing solenoid valve button 8 is connected with one end of manual opening solenoid valve button SB1 and one end of first intermediate relay normally open KA1.2, the other end of manual opening solenoid valve SB1 and the other end of first intermediate relay KA1.2 are connected with one end of manual closing solenoid switch SB2, the other end of manual closing solenoid switch SB KT 5 and the other end of second time delay relay KA 2.2 are connected with one end of first time delay relay normally closed relay, the other end of first time delay relay KT 2.KT 3.2 is connected with one end of first time delay relay normally closed relay normally open relay SA 1.2, the other end of first time delay relay normally open relay normally closed relay and the other end of first relay SA 2.2.2, the other end of the relay normally closed relay normally open relay.
The manual control step is operated by a start button and a stop button on a panel of the electric cabinet.
The automatic control step is to process signals according to the high and low liquid levels, realize the automatic water replenishing of low start and high stop, and simultaneously add the high and high liquid level protection stop function in the circuit.
FIG. 1 is a process system diagram of a waste incineration slag extractor, wherein the numbers in the diagram respectively correspond to the following: the slag extractor 1 is used for pushing slag and fly ash generated by burning garbage out to a slag pit through the slag extractor; the slag extractor water tank 2 is communicated with the slag extractor and is used for installing and measuring the liquid level meter; the radar liquid level meter 3 is used for measuring the liquid level of the water tank of the slag extractor; and the electromagnetic valve 4 is used for replenishing the recycling concentrated water for the slag extractor.
The slag extractor receives ash slag generated by burning the garbage and fly ash generated by blowing ash of the boiler, and pushes the ash slag and the fly ash out of the slag pit through hydraulic drive.
The slag extractor adopts a water seal mode:
firstly, the negative pressure in the incinerator is maintained.
Secondly, the ash slag is rapidly cooled.
The water seal generates steam along with the pushing out and cooling of ash slag, and a large amount of loss is generated, so that the liquid level in the slag extractor needs to reach a reasonable liquid level through water supplement, and the negative pressure in the incinerator is ensured.
The water seal medium of the slag extractor adopts concentrated water generated by reverse osmosis of leachate precipitated from garbage through sewage treatment for reutilization.
The radar liquid level meter 3 adopts a radar form and is of a non-contact type, the radar liquid level meter outputs four alarm switch signals, namely a high alarm switch signal HH, a high alarm switch signal H, a low alarm switch signal L and a low alarm switch signal LL, the high alarm switch signal HH is used for sound-light alarm and protection stop of a water replenishing electromagnetic valve, the high alarm switch signal H is used for alarm and automatic water replenishing closing, the low alarm switch signal L is used for alarm and automatic water replenishing starting, and the low alarm switch signal LL is used for sound-light alarm.
Fig. 2 is a panel diagram of the liquid level control device 16, which is operated and monitored by the panel 15, and the panel 15 is distributed with a power indicator lamp 5, a manual/automatic transfer switch 6, a manual solenoid-on button 7, a manual solenoid-off button 8, a solenoid-on indication 9, a solenoid-off indication 10, a liquid level high-high audible and visual alarm 11, a liquid level high indication 12, a liquid level low indication 13 and a liquid level low-audible and visual alarm 14.
As shown in fig. 3 and 4, a device power supply is supplied by a UPS uninterruptible power supply, a device main breaker QF1 is connected, a device main breaker QF1 is connected, the device is powered on, a high alarm switch signal HH, a high alarm switch signal H, a low alarm switch signal L and a low alarm switch signal LL output by a radar level gauge are led into a liquid level control device 16 through connecting terminals, and are respectively delayed for 10 seconds through a first delay relay KT1, a second delay relay KT2, a third delay relay KT3 and a fourth delay relay KT4, and if a signal lasting for 10 seconds still exists, a corresponding delay relay coil can be attracted and contacts can act.
Example 4: as shown in fig. 1, 2, 3 and 4, the liquid level measuring and controlling method of the waste incineration slag tapping machine comprises a manual control step and an automatic control step,
manual control: an operator manually switches an electromagnetic valve to replenish water, a manual/automatic change-over switch SA1 is switched to be manual, a manual opening electromagnetic valve button SB1 is clicked, a first intermediate relay coil KA1.1 is electrified, and water replenishing is started; the solenoid valve V1 gets the electricity and opens, and the high liquid level signal time delay of the manual shut solenoid valve button SB2 of inching is 10 seconds, and first time delay relay coil KT1.1 gets the electricity, and first time delay relay normally closed point KT1.2 disconnection, first auxiliary relay coil KA1.1 lose the electricity, and solenoid valve V1 loses the electricity and closes, stops the moisturizing.
The automatic control step is that the automatic control of the solenoid valve switch for water supplement is realized according to the liquid level, the manual/automatic change-over switch SA1 is automatically switched, the L low liquid level signal is delayed for 10 seconds, the third time delay relay coil KT3.1 is electrified, the normally open point KT3.2 of the third time delay relay is closed, the first intermediate relay coil KA1.1 is electrified, the solenoid valve V1 is electrified and opened, the H high liquid level signal is delayed for 10 seconds, the second time delay relay coil KT2.1 is electrified, the normally closed point KT2.2 of the second time delay relay coil is disconnected, the first intermediate relay coil KA1.1 is electrified, and the solenoid valve V1 is electrified and closed.
The liquid level control device 16 is powered on, a white power supply indicator lamp H L5 is on, a solenoid valve V1 is powered on and opened, a first intermediate relay normally open point KA1.4 is closed, a green solenoid valve open indicator lamp H L3 is bright, a solenoid valve V1 is powered off and closed, a first intermediate relay normally closed point KA1.5 is closed, a red solenoid valve open indicator lamp H L4 is bright, an HH high liquid level signal is delayed for 10 seconds, a first delay relay normally open point KT1.3 is closed, a first intermediate relay normally open point KA1.6 acts, an H high liquid level signal is delayed for 10 seconds, a second delay relay normally open point KT2.3 acts, a first yellow liquid level high indicator lamp H L1 acts, a L low liquid level signal is delayed for 10 seconds, a third delay relay normally open point KT3.3 acts, a second yellow liquid level high indicator lamp H L2 acts, a LL low liquid level signal is delayed for 10 seconds, a fourth delay relay normally open point KT3.2 acts, and a warning light A2 acts.
As described above, although the embodiments of the present invention have been described in detail, it will be apparent to those skilled in the art that many modifications are possible without substantially departing from the spirit and scope of the present invention. Therefore, such modifications are also all included in the scope of protection of the present invention.
Claims (6)
1. A liquid level measurement control method of a waste incineration slag discharging machine is characterized by comprising a liquid level measuring instrument and a liquid level control device; comprises the following steps; the liquid level measuring instrument adopts a non-contact radar liquid level meter, outputs a high alarm switch signal, a low alarm switch signal and a low alarm switch signal according to the measured liquid level, is connected to a liquid level control electric cabinet through hard wiring, and carries out delay 10 seconds processing through a delay relay, and the processed signals are used for indication and alarm of a panel of the electric cabinet and also used for automatic control of the liquid level; the manual control step and the automatic control step of the liquid level of the slag extractor are realized by the electric cabinet of the liquid level control device, the manual control step is operated by a button on a panel of the electric cabinet, and the automatic control step is to process signals according to the high and low liquid levels to realize the automatic water replenishing of low start and high stop.
2. The liquid level measurement control method of the waste incineration slag tapping machine according to claim 1, characterized by the manual control step of: the manual/automatic change-over switch is turned on manually, a manual opening solenoid valve button is inching, a water replenishing solenoid valve is electrified to start water replenishing, the manual closing solenoid valve button is inching to stop water replenishing manually, or a high liquid level alarm switch signal is delayed for 10 seconds, a delay relay acts, and water replenishing is stopped;
and (3) automatic control: the manual/automatic change-over switch is turned to be automatic, the low liquid level alarm switch signal is delayed for 10 seconds, the relay is powered on, the water replenishing electromagnetic valve is powered on and opened, water replenishing is started, the high liquid level alarm switch signal is delayed for 10 seconds, the relay is powered on, the electromagnetic valve is powered off, and automatic water replenishing is achieved by low start and high stop.
3. The liquid level measurement control method of the waste incineration slag tapping machine according to claim 1, characterized by the manual control step of: an operator manually switches on and off the electromagnetic valve to replenish water, the manual/automatic change-over switch is turned on manually, a button of the manual switch-on electromagnetic valve is turned on in a inching mode, the first intermediate relay coil is electrified, and water replenishing is started; the solenoid valve is electrified and opened, the manual closing of the solenoid valve button is inching or the high liquid level signal is delayed for 10 seconds, the first delay relay coil is electrified, the normally closed point of the first delay relay is disconnected, the first intermediate relay coil is electrified, the solenoid valve is electrified and closed, and water replenishing is stopped.
And (3) automatic control: the automatic control of the solenoid valve switch for water supplement is realized according to the liquid level, the manual/automatic change-over switch is automatically switched, the low liquid level signal delays for 10 seconds, the third delay relay coil is electrified, the normally open point of the third delay relay is closed, the first intermediate relay coil is electrified, the solenoid valve is electrified and opened, the high liquid level signal delays for 10 seconds, the second delay relay coil is electrified, the normally closed point of the second delay relay coil is disconnected, the first intermediate relay coil is electrified, and the solenoid valve is electrified and closed;
the liquid level control device is powered on, and the white power indicator lamp is on; the electromagnetic valve is powered on and opened, the normally open point of the first intermediate relay is closed, and the green electromagnetic valve opening indicator lamp is on; when the electromagnetic valve is switched off in a power-off mode, the normally closed point of the first intermediate relay is closed, and the red electromagnetic valve opening indicator lamp is on; the high liquid level signal is delayed for 10 seconds, the normally open point of the first delay relay is closed, and the acousto-optic alarm lamp for high liquid level acts; the high liquid level signal is delayed for 10 seconds, the second delay relay is normally opened to act, and the first yellow liquid level high indicator lamp acts; the low liquid level signal is delayed for 10 seconds, a third delay relay normally opens and acts, and a second yellow liquid level high indicator lamp acts; the low liquid level signal is delayed for 10 seconds, the fourth time delay relay is normally opened to act, and the low liquid level acousto-optic alarm lamp acts.
4. A liquid level measurement control device of a waste incineration mucking machine is characterized by comprising a mucking machine, a radar liquid level meter and a liquid level control device, wherein the mucking machine is connected with an electromagnetic valve and a mucking machine water tank; the slag extractor water tank is communicated with a slag extractor and is used for installing and measuring a radar liquid level meter; the radar liquid level meter measures the liquid level of the slag discharging machine water tank; the electromagnetic valve is used for replenishing recycling concentrated water for the slag extractor, and the liquid level control device is connected with the electromagnetic valve and the liquid level measuring instrument.
5. The liquid level measurement control device of the refuse incineration slag extractor as claimed in claim 4, wherein the panel of the liquid level control device is distributed with a power indicator, a manual/automatic switch, a manual solenoid valve button, a solenoid valve on indicator, a solenoid valve off indicator, a liquid level high audible and visual alarm, a liquid level high indicator, a liquid level low indicator and a liquid level low audible and visual alarm.
6. The liquid level measurement control device of the waste incineration slag discharging machine according to claim 4, characterized in that a high alarm switch signal, a low alarm switch signal and a low alarm switch signal output by the radar liquid level meter are introduced into the liquid level control device through the wiring terminals, and are respectively delayed for 10 seconds through the first delay relay, the second delay relay, the third delay relay and the fourth delay relay, if the signals last for 10 seconds still exist, the corresponding delay relay coil can be attracted and the contact can act.
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| CN112577572A (en) * | 2020-12-16 | 2021-03-30 | 福建福清核电有限公司 | Debugging and diagnosing system and method for radar liquid level meter |
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Application publication date: 20200728 |