CN111253038A - Control system and control method for low-temperature sludge drying equipment - Google Patents

Control system and control method for low-temperature sludge drying equipment Download PDF

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Publication number
CN111253038A
CN111253038A CN202010110742.5A CN202010110742A CN111253038A CN 111253038 A CN111253038 A CN 111253038A CN 202010110742 A CN202010110742 A CN 202010110742A CN 111253038 A CN111253038 A CN 111253038A
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CN
China
Prior art keywords
control system
station control
temperature
mesh belt
machine
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Pending
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CN202010110742.5A
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Chinese (zh)
Inventor
房强
徐慎宝
董吉斌
李平
王东亮
李占军
谈景辉
牟维涛
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Dezhou Guangyuan Environmental Protection Technology Co ltd
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Dezhou Guangyuan Environmental Protection Technology Co ltd
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Priority to CN202010110742.5A priority Critical patent/CN111253038A/en
Publication of CN111253038A publication Critical patent/CN111253038A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/13Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating

Abstract

The invention discloses a control system and a control method of a low-temperature sludge drying device, and the control system comprises an electric control cabinet, wherein a PLC control system is arranged in the electric control cabinet, a touch screen is arranged on the surface of the electric control cabinet, and a manual/automatic change-over switch is arranged on the touch screen; the PLC control system comprises a main station control system and an auxiliary station control system, the main station control system is electrically connected with the main station, the main station control system controls the operation of a motor in the main station, the auxiliary station control system is electrically connected with the auxiliary station, and the auxiliary station control system controls the operation of the motor in the auxiliary station; the touch screen is also provided with an indicator light and an instrument for displaying the running state, the running parameters and the fault state of the motors in the main station and the secondary station; when motors in the main station and the secondary station are in a fault state or reach alarm parameter set values, the alarm gives a prompt, and the position where the fault occurs is displayed on the touch screen. The control system effectively solves the problem that the low-temperature sludge drying equipment is complex to maintain, can reduce the failure rate of the equipment and ensures the long-time operation of the equipment.

Description

Control system and control method for low-temperature sludge drying equipment
Technical Field
The invention relates to the technical field related to low-temperature sludge drying treatment, in particular to a control system and a control method for a low-temperature sludge drying device.
Background
The low-temperature sludge drying equipment is novel sludge treatment equipment, has many advantages, such as good energy-saving property, high safety, strong applicability, environmental protection and the like, and has wide application in many fields. The low-temperature sludge drying equipment mainly adopts low-temperature waste heat to carry out drying treatment on sludge and comprises a plurality of heat pump systems and a sludge conveying system. However, the low-temperature sludge drying equipment comprises a plurality of heat pump systems, the operation process is complex, and misoperation is easy to occur in the operation process of workers, so that the failure rate of the equipment is high, the running efficiency of the equipment is low, and meanwhile, the maintenance process of the equipment is also complex.
Disclosure of Invention
The invention provides a control system and a control method for a low-temperature sludge drying device, which are used for solving the problems of complex maintenance, high failure rate and the like of the conventional low-temperature sludge drying device.
In order to solve the problems, the invention adopts the following technical scheme: a control system of a low-temperature sludge drying device comprises an electric control cabinet, wherein a PLC control system is arranged in the electric control cabinet, a touch screen is arranged on the surface of the electric control cabinet, and a manual/automatic change-over switch is arranged on the touch screen and is used for changing over to enable the low-temperature sludge drying device to be in a manual or automatic control mode; the PLC control system comprises a main station control system and an auxiliary station control system, the main station control system is electrically connected with the main station, the main station control system controls the operation of a motor in the main station, the auxiliary station control system is electrically connected with the auxiliary station, and the auxiliary station control system controls the operation of the motor in the auxiliary station; the surface of the electric control cabinet is also provided with an alarm which is electrically connected with the PLC control system; the touch screen is also provided with an indicator light and an instrument for displaying the running state, the running parameters and the fault state of the motors in the main station and the secondary station; when motors in the main station and the secondary station are in a fault state or reach alarm parameter set values, the alarm gives a prompt, and the position where the fault occurs is displayed on the touch screen.
Optionally, an automatic start/stop switch is included on the touch screen for starting or stopping the automatic control mode when the manual/automatic changeover switch is switched to the automatic control mode.
Optionally, the primary station comprises a mesh belt machine, a slitter, a stirrer, a double-screw machine, an arch breaking machine, a conveying motor, a discharging machine, a feeding bin and a discharging bin, and the secondary station comprises a blower, a circulating fan, an electric heater and a compressor.
Optionally, the secondary station further comprises a radiator fan.
When the control system of the low-temperature sludge drying equipment is switched into a manual control mode, a manual/automatic change-over switch is rotated to the manual control mode; when the control system of the sludge low-temperature drying equipment is switched into an automatic control mode, rotating a manual/automatic change-over switch to the automatic control mode; when the control system of the sludge low-temperature drying equipment is in an automatic control mode, an automatic start/stop switch is pressed, an automatic start system is started, and then the automatic start/stop switch is pressed, and the automatic stop system is started.
Optionally, the control method of the automatic start system includes:
s1, the master station control system controls the master station to start; meanwhile, the master station control system sends a starting command to the secondary station control system, the secondary station control system is started, and the secondary station control system controls the blower to be started;
s2, the secondary station control system judges whether the blower has a fault, and when the blower has no fault, the secondary station control system controls the circulating blower to start;
s3, the secondary station control system judges whether the circulating fan has a fault, when the circulating fan has no fault, the secondary station control system judges whether the temperature of the mesh belt is lower than the electric heating auxiliary heating starting temperature, and when the temperature of the mesh belt is lower than the electric heating auxiliary heating starting temperature, the secondary station control system controls the electric heating starting
S4, judging whether the mesh belt temperature is equal to the mesh belt set temperature or not by the auxiliary station control system, and controlling the compressor to start when the mesh belt temperature is equal to the mesh belt set temperature by the auxiliary station control system;
s5, the secondary station control system judges whether the compressor has a fault, and when the compressor has no fault, the secondary station control system sends a signal for finishing the starting of the secondary station to the primary station control system; the master station control system judges whether the mesh belt temperature is equal to the mesh belt set temperature or not, and when the mesh belt temperature is equal to the mesh belt set temperature, the master station control system controls the mesh belt machine to start;
s6, judging whether the mesh belt runs or not by the master station control system, and controlling the slitter and the stirrer to start when the mesh belt runs;
s7, the master station control system judges whether the slitter and the stirrer have faults or not, and when the slitter and the stirrer have no faults, the master station control system controls the double-screw machine, the arch breaking machine and the transmission motor to start, so that the feeding bin is automatically fed;
s8, the main station control system judges whether the double-screw machine, the arch breaking machine and the conveying motor have faults or not, and when the double-screw machine, the arch breaking machine and the conveying motor have no faults, the main station control system controls the discharging machine to start, and materials are automatically discharged to the discharging bin.
Optionally, the control method of the automatic stop system includes:
s1, the master station control system controls the double-screw machine, the arch breaking machine and the conveying motor to stop; meanwhile, the master station control system detects whether materials exist on the slitter, and controls the slitter and the stirrer to stop when no materials exist on the slitter; when materials exist in the slitting machine, the slitting machine and the stirrer normally operate, and the materials are conveyed to the mesh belt until no materials exist in the slitting machine;
s2, detecting whether a material exists on the mesh belt by the master station control system, and controlling the mesh belt machine and the discharging machine to stop by the master station control system when the material does not exist on the mesh belt; when the mesh belt is provided with materials, the mesh belt machine and the discharging machine normally operate, and the materials are conveyed into the discharging bin until no materials exist on the mesh belt; meanwhile, the master station control system sends a signal to the secondary station control system, the secondary station control system controls the compressor and the electric heating to stop, the compressor is stopped firstly, and then the electric heating is stopped;
and S3, when the electric heating is stopped for a set time, the secondary station control system controls the circulating fan and the blower to stop, and stops the circulating fan and then stops the blower.
Optionally, after the temperature of the mesh belt continuously exceeds the set temperature for a certain time, the radiator fan is started; stopping the compressor after the radiator fan is started for a set time; and when the temperature of the mesh belt returns to the normal set range, the radiator fan stops.
Optionally, the compressor is provided with a protection function, when the compressor is at a set low pressure, high pressure or high temperature, the protection function is started, and the alarm gives a prompt to turn off the compressor.
The invention provides a control system and a control method of a low-temperature sludge drying device, wherein the low-temperature sludge drying device is controlled to be in a manual or automatic control mode through a manual/automatic change-over switch on a touch screen; and when the motors in the main station and the auxiliary station are in a fault state or reach alarm parameter set values, the alarm gives out a prompt, and the position where the fault occurs is displayed on the touch screen. The control system and the control method effectively solve the problem that the low-temperature sludge drying equipment is complex to overhaul, can reduce the failure rate of the equipment and ensure long-time operation of the equipment.
Drawings
FIG. 1 is a schematic structural diagram of an electric control cabinet in this embodiment;
FIG. 2 is a control schematic diagram of automatic start-up of a control system of the low-temperature sludge drying equipment in the embodiment;
FIG. 3 is a control schematic diagram of automatic stop of a control system of the low-temperature sludge drying equipment in the embodiment;
fig. 4 is a flowchart illustrating the operation of the touch screen automatic control interface according to the present embodiment.
Illustration of the drawings:
1. electric control cabinet 2 and touch screen
3. Alarm 4, manual/automatic change-over switch
5. Automatic start/stop switch 6, guipure
7. Mesh belt machine 8, slitter
9. Mixer 10, double helix machine
11. Arch breaking machine 12 and transmission motor
13. Feeding bin 14 and discharging bin
15. Discharging machine 16, blower
17. Circulating fan 18, electric heating
19. Compressor with a compressor housing having a plurality of compressor blades
Detailed Description
The technical solutions of the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and these embodiments are only used for illustrating the present invention, but not for limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the term "connected" is to be interpreted broadly, e.g. as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1 and 4, an embodiment of the invention provides a control system of a low-temperature sludge drying device, which comprises an electric control cabinet 1, wherein a PLC control system is arranged inside the electric control cabinet 1, the PLC control system controls the running state of the whole low-temperature sludge drying device, a touch screen 2 is arranged on the surface of the electric control cabinet 1, and a manual/automatic change-over switch 4 is arranged on the touch screen 2, and the manual/automatic change-over switch 4 is used for switching to enable the low-temperature sludge drying device to be in a manual control mode or an automatic control mode; the PLC control system comprises a main station control system and an auxiliary station control system, wherein the main station comprises a mesh belt machine 7, a slitter 8, a stirrer 9, a double-screw machine 10, an arch breaking machine 11, a conveying motor 12, a discharging machine 15, an upper material bin 13 and a discharging bin 14, the auxiliary station comprises a blower 16, a circulating fan 17, an electric heater 18 and a compressor 19, and the compressor 19 is used for controlling a heat pump system of the sludge low-temperature drying equipment; the master station control system is electrically connected with the master station and controls the operation of the motors of the devices in the master station, the secondary station control system is electrically connected with the secondary station and controls the operation of the motors of the devices in the secondary station; the surface of the electric control cabinet 1 is also provided with an alarm 3, and the alarm 3 is electrically connected with the PLC control system; the touch screen 2 is also provided with an indicator light and an instrument for displaying the running state, the running parameters and the fault state of the motors in the main station and the auxiliary station; when motors in the main station and the secondary station are in a fault state or reach alarm parameter set values, the alarm 3 gives out a prompt, and the position where the fault occurs is displayed on the touch screen 2.
Further, when the manual/automatic change-over switch 4 is switched to the manual control mode, each device of the sludge low-temperature drying device is controlled to be independently started or stopped by hand; when the automatic control mode is switched, the low-temperature sludge drying equipment is controlled to start and stop by a PLC control system in the electric control cabinet 1. The touch screen 2 includes an automatic start/stop switch 5, and when the automatic control mode is switched, the automatic control mode can be started or stopped only by pressing the automatic start/stop switch 5. The control system further comprises a power distribution cabinet, the power distribution cabinet is electrically connected with the electric control cabinet 1, and the power distribution cabinet supplies power to the electric control cabinet 1 and also supplies power to a motor in the main station and a motor in the auxiliary station.
The electrical connections described above are all made using known techniques.
As shown in fig. 2, the automatic starting system of the sludge low-temperature drying equipment has the following working process:
(1) the manual/automatic change-over switch 4 on the touch screen 2 is switched to an automatic control mode, the automatic start/stop switch 5 is clicked, and the master station control system controls the master station to start; meanwhile, the master station control system sends a starting command to the secondary station control system, the secondary station control system is started, and the secondary station control system controls the blower 16 to be started;
(2) the secondary station control system judges whether the blower 16 has a fault, and if the blower 16 has no fault, the secondary station control system controls the circulating fan 17 to start;
(3) the auxiliary station control system judges whether the circulating fan 17 has a fault, if the circulating fan 17 has no fault, the auxiliary station control system judges whether the temperature of the mesh belt is lower than the electric heating auxiliary heat starting temperature, and when the temperature of the mesh belt is lower than the electric heating auxiliary heat starting temperature, the auxiliary station control system controls the electric heating 18 to start; if a plurality of electric heaters 18 exist, the electric heaters 18 are sequentially started at intervals of 5 seconds;
(4) the auxiliary station control system judges whether the mesh belt temperature is equal to the mesh belt set temperature or not, and if the mesh belt temperature is equal to the mesh belt set temperature, the auxiliary station control system controls the compressor 19 to start; if a plurality of compressors 19 exist, the compressors 19 are started in sequence at intervals of 5 seconds;
(5) the secondary station control system judges whether the compressor 19 has a fault, and if the compressor has no fault, the secondary station control system sends a signal for finishing the starting of the secondary station to the primary station control system; the master station control system judges whether the mesh belt temperature is equal to the mesh belt set temperature or not, and if the mesh belt temperature is equal to the mesh belt set temperature, the master station control system controls the mesh belt machine 7 to start; if a plurality of net belt machines 7 exist, the plurality of net belt machines 7 are started simultaneously;
(6) the master station control system judges whether the mesh belt 6 runs, and if the mesh belt 6 runs, the master station control system controls the slitter 8 and the stirrer 9 to start;
(7) the master station control system judges whether the slitter 8 and the stirrer 9 have faults or not, and if the slitter 8 and the stirrer 9 have no faults, the master station control system controls the double-screw machine 10, the arch breaking machine 11 and the transmission motor 12 to be started to automatically feed the feeding bin 13;
(8) the master station control system judges whether the double-screw machine 10, the arch breaking machine 11 and the conveying motor 12 have faults or not, if no faults exist, the master station control system controls the discharging machine 15 to start, and materials are automatically discharged to the discharging bin 14; so far, the automatic start is completed.
As shown in fig. 3, the automatic stopping system of the low-temperature sludge drying equipment has the following working process:
(1) clicking an automatic start/stop switch 5 on the touch screen 2, and controlling the double-helix machine 10, the arch breaking machine 11 and the transmission motor 12 to stop by the master station control system; meanwhile, the master station control system detects whether the material exists on the slitter 8, and if the material does not exist on the slitter 8, the master station control system controls the slitter 8 and the stirrer 9 to stop;
(2) the master station control system detects whether the mesh belt 6 has materials, and if the mesh belt 6 has no materials, the master station control system controls the mesh belt machine 7 and the discharging machine 15 to stop; meanwhile, the master station control system sends a signal to the secondary station control system, the secondary station control system controls the compressor 19 and the electric heating 18 to stop, the compressor 19 is stopped first, and then the electric heating 18 is stopped;
(3) after the electric heating 18 is stopped for a set time, the secondary station control system controls the circulating fan 17 and the blower 16 to stop, firstly stops the circulating fan 17, and then stops the blower 16; then the secondary station control system sends a signal for finishing the stop of the secondary station to the master station control system; and then automatically stopping the completion.
Further, the secondary station also comprises a radiator fan which is electrically connected with the secondary station control system. The mesh belt 6 is provided with a first temperature sensor and a humidity sensor, the humidity sensor is electrically connected with the master station control system, and the humidity sensor is used for detecting the humidity of the mesh belt 6; the first temperature sensor is respectively connected with the master station control system and the secondary station control system; the first temperature sensor detects the temperature of the mesh belt 6, detected temperature signals are transmitted to the PLC control system, and the PLC control system controls the heat dissipation of the radiator fan to the whole operation system according to the obtained temperature signals. When the temperature of the mesh belt is larger than or equal to the set limit starting temperature of the mesh belt, the PLC control system controls the radiator fan to be started to radiate the whole operation system; and when the temperature of the mesh belt is lower than the mesh belt set limit starting temperature, the PLC control system controls the fan of the radiator to be turned off, and the whole operation system is stopped from radiating. For example, when the temperature of the mesh belt is more than or equal to the set temperature of the mesh belt and is +5 ℃, the PLC control system controls the radiator fan to be started to radiate the whole operation system; and when the temperature of the mesh belt is less than the mesh belt set temperature and 5 ℃, the PLC control system controls the fan of the radiator to be closed, and the whole operation system is stopped radiating.
When the temperature of the mesh belt 6 continuously exceeds the set temperature for a certain time, the radiator fan is started, and when the radiator fan is started for the set time, the compressor 19 is stopped; if there are a plurality of compressors 19, stopping the compressors 19 in sequence at 20-minute intervals; when the temperature of the mesh belt 6 returns to the normal set range, the radiator fan stops, and the compressor 19 starts; if there are a plurality of compressors 19, the compressors 19 are sequentially started at intervals of 5 seconds. When the sludge low-temperature drying equipment is in an automatic starting or stopping state and the compressor 19 is in failure or normally stopped, 180 seconds are required to delay the time to start the compressor 19 again.
Further, the compressor 19 is provided with a protection function, and the compressor 19 is provided with a second temperature sensor and an air pressure sensor, which are electrically connected to the sub-station control system, respectively. The second temperature sensor and the air pressure sensor transmit the detected temperature signal and air pressure signal to the secondary station control system, when the compressor 19 is at a set low pressure, high pressure or high temperature, the protection function can be started, and the alarm 3 gives out a prompt to close the compressor 19. For example, when the suction low pressure of the compressor 19 is less than 0.05Mpa, the secondary station control system controls the compressor 19 to stop; when the suction low pressure is more than 0.15Mpa, the secondary station control system controls the compressor 19 to start. When the exhaust high pressure of the compressor 19 is more than 2.8Mpa, the secondary station control system controls the compressor 19 to stop; when the high pressure of the exhaust gas is less than 2.2Mpa, the secondary station control system controls the compressor 19 to start. When the exhaust temperature of the compressor 19 is more than 125 ℃, the secondary station control system controls the compressor 19 to stop; when the exhaust temperature is less than 90 ℃, the secondary station control system controls the compressor 19 to start. The low suction pressure, high discharge pressure and temperature of the compressor 19 are determined mainly by the manufacturer and may vary according to the equipment conditions.
Further, a first ultrasonic sensor is further arranged on the slitter 8 and electrically connected with the master station control system, and when the slitter is in an automatic stop state, the first ultrasonic sensor is used for detecting whether materials exist in the net slitter 8 and transmitting detected signals to the master station control system, so that the master station control system controls the operation states of the slitter 8 and the stirrer 9. When the first ultrasonic sensor detects that no material exists in the slitter 8, the master station control system controls the slitter 8 and the stirrer 9 to stop; when a first ultrasonic sensor detects that materials exist in the slitter 8, the slitter 8 and the stirrer 9 run normally to convey the materials to the mesh belt 6 until no materials exist in the slitter 8.
Further, a second ultrasonic sensor is further arranged on the mesh belt 6 and electrically connected with the master station control system, and when the mesh belt is in an automatic stop state, the second ultrasonic sensor is used for detecting whether materials exist on the mesh belt 6 and transmitting detected signals to the master station control system, so that the master station control system controls the running states of the mesh belt machine 7 and the discharging machine 15. When the second ultrasonic sensor detects that no material exists on the mesh belt 6, the master station control system controls the mesh belt machine 7 and the discharging machine 15 to stop; when the second ultrasonic sensor detects that the material exists on the mesh belt 6, the mesh belt machine 7 and the discharging machine 15 normally operate, and the material is conveyed into the discharging bin 14 until no material exists on the mesh belt 6.
Further, a third ultrasonic sensor is arranged in the feeding bin 13 and electrically connected with the master station control system, and the third ultrasonic sensor is used for detecting the material level condition in the feeding bin 13 and transmitting a detected signal to the master station control system, so that the feeding bin 13 is controlled to automatically feed. When the material level in the feeding bin 13 is lower than the lower limit of the material level, the main station control system controls the double-screw machine 10, the arch breaking machine 11 and the conveying motor 12 to be started, and materials are conveyed into the feeding bin 13; when the material level in the feeding bin 13 is equal to or higher than the upper limit of the material level, the main station control system controls the double-screw machine 10, the arch breaking machine 11 and the conveying motor 12 to stop, and the feeding bin 13 stops automatic feeding.
Further, a fourth ultrasonic sensor is arranged in the discharge bin 14 and electrically connected with the master station control system, and the fourth ultrasonic sensor is used for detecting the material level condition in the discharge bin 14 and transmitting a detected signal to the master station control system, so that the discharge bin 14 is controlled to discharge materials automatically. When the material level in the discharging bin is equal to or higher than the upper limit of the material level, the discharging is automatically started, and the discharging is automatically stopped when the discharging bin runs to the set discharging time.
After the electric control cabinet 1 is started, the operation flow of the PLC control system is displayed on the touch screen 2, and the interface of the touch screen 2 comprises a trend chart, parameter display, a manual page, user parameters, administrator parameters and an alarm page. The initial interface of the touch screen 2 is an interface of an automatic control mode, the parameter display interface displays the states of the sensors in real time, and displays the temperature and humidity of the mesh belt 6, the exhaust temperature of the compressor 19 and the like in real time; the user parameters comprise frequency setting of the mesh belt machine 7, frequency setting of the slitter 8 and mesh belt setting temperature, and the parameters are set according to materials to be processed; the trend graph shows the trend of the temperature and humidity of the mesh belt 6; the alarm page displays the alarm information of a period of time.
Example two
The embodiment of the invention provides a control method of a low-temperature sludge drying device by using the control system of the low-temperature sludge drying device, when the control system needs to be switched into a manual control mode, a manual/automatic change-over switch is rotated to the manual control mode; when the automatic control mode needs to be switched, rotating the manual/automatic change-over switch to the automatic control mode; when the control system of the sludge low-temperature drying equipment is in an automatic control mode, an automatic start/stop switch is pressed, an automatic start system is started, and then the automatic start/stop switch is pressed, and the automatic stop system is started;
when the automatic starting system is started by the control system of the low-temperature sludge drying equipment, the control method of the automatic starting system comprises the following steps:
s1, the master station control system controls the master station to start; meanwhile, the master station control system sends a starting command to the secondary station control system, the secondary station control system is started, and the secondary station control system controls the blower 16 to be started;
s2, the secondary station control system judges whether the blower 16 has a fault, and when the blower 16 has no fault, the secondary station control system controls the circulating fan 17 to start;
s3, the secondary station control system judges whether the circulating fan 17 has a fault, when the circulating fan 17 has no fault, the secondary station control system judges whether the mesh belt temperature is lower than the electric heating auxiliary heat starting temperature through the first temperature sensor, and when the mesh belt temperature is lower than the electric heating auxiliary heat starting temperature, the secondary station control system controls the electric heating 18 to start; if a plurality of electric heaters 18 exist, the electric heaters 18 are sequentially started at intervals of 5 seconds;
s4, the secondary station control system judges whether the mesh belt temperature is equal to the mesh belt set temperature through the first temperature sensor, and when the mesh belt temperature is equal to the mesh belt set temperature, the secondary station control system controls the compressor 19 to start; if a plurality of compressors 19 exist, the compressors 19 are started in sequence at intervals of 5 seconds;
s5, the secondary station control system judges whether the compressor 19 has a fault, and when the compressor 19 has no fault, the secondary station control system sends a signal for finishing the starting of the secondary station to the primary station control system; the master station control system judges whether the mesh belt temperature is equal to the mesh belt set temperature or not through the first temperature sensor, and when the mesh belt temperature is equal to the mesh belt set temperature, the master station control system controls the mesh belt machine 7 to start; if a plurality of net belt machines 7 exist, the plurality of net belt machines 7 are started simultaneously;
s6, the master station control system judges whether the mesh belt 6 runs, and when the mesh belt 6 runs, the master station control system controls the slitter 8 and the stirrer 9 to start;
s7, the master station control system judges whether the slitter 8 and the stirrer 9 have faults or not, and when the slitter 8 and the stirrer 9 have no faults, the master station control system controls the double-screw machine 10, the arch breaking machine 11 and the transmission motor 12 to start and automatically feed the feeding bin 13;
s8, the master station control system judges whether the double-screw machine 10, the arch breaking machine 11 and the conveying motor 12 have faults or not, and when the double-screw machine 10, the arch breaking machine 11 and the conveying motor 12 have no faults, the master station control system controls the discharging machine 15 to start, and materials are automatically discharged to the discharging bin 14.
When the automatic stopping system is started by the control system of the low-temperature sludge drying equipment, the control method of the automatic stopping system comprises the following steps:
s1, the master station control system controls the double-helix machine 10, the arch breaking machine 11 and the transmission motor 12 to stop; meanwhile, the main station control system detects whether materials exist on the slitter 8 through the first ultrasonic sensor, and the first ultrasonic sensor transmits detected signals to the main station control system, so that the main station control system controls the running states of the slitter 8 and the stirrer 9; when no material exists on the slitter 8, the master station control system controls the slitter 8 and the stirrer 9 to stop; when the first ultrasonic sensor detects that materials exist in the slitter 8, the slitter 8 and the stirrer 9 normally operate to convey the materials to the mesh belt 6 until no materials exist in the slitter 8;
s2, the master station control system detects whether the material exists on the mesh belt 6 through the second ultrasonic sensor, and the second ultrasonic sensor transmits the detected signal to the master station control system, so that the master station control system controls the running states of the mesh belt machine 7 and the discharging machine 15; when no material exists on the mesh belt 6, the master station control system controls the mesh belt machine 7 and the discharging machine 15 to stop; when the second ultrasonic sensor detects that the mesh belt 6 has materials, the mesh belt machine 7 and the discharging machine 15 normally operate, and the materials are conveyed into the discharging bin 14 until no materials exist on the mesh belt 6; meanwhile, the master station control system sends a signal to the secondary station control system, the secondary station control system controls the compressor 19 and the electric heating 18 to stop, the compressor 19 is stopped first, and then the electric heating 18 is stopped;
and S3, when the electric heating 18 is stopped for a set time, the secondary station control system controls the circulating fan 17 and the blower 16 to stop, and stops the circulating fan 17 and then stops the blower 16.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims (9)

1. The utility model provides a mud low temperature mummification equipment control system, includes automatically controlled cabinet, its characterized in that: the automatic sludge drying equipment is characterized in that a PLC control system is arranged in the electric control cabinet, a touch screen is arranged on the surface of the electric control cabinet, and a manual/automatic change-over switch is arranged on the touch screen and used for changing over to enable the sludge low-temperature drying equipment to be in a manual or automatic control mode; the PLC control system comprises a main station control system and an auxiliary station control system, the main station control system is electrically connected with the main station, the main station control system controls the operation of a motor in the main station, the auxiliary station control system is electrically connected with the auxiliary station, and the auxiliary station control system controls the operation of the motor in the auxiliary station; the surface of the electric control cabinet is also provided with an alarm which is electrically connected with the PLC control system; the touch screen is also provided with an indicator light and an instrument for displaying the running state, the running parameters and the fault state of the motors in the main station and the secondary station; when the motors in the main station and the secondary station are in a fault state or reach alarm parameter set values, the alarm gives a prompt, and the position where the fault occurs is displayed on the touch screen.
2. The control system of the low-temperature sludge drying equipment according to claim 1, characterized in that: the touch screen comprises an automatic start/stop switch which is used for starting or stopping the automatic control mode when the manual/automatic change-over switch is switched to the automatic control mode.
3. The control system of the low-temperature sludge drying equipment according to claim 2, characterized in that: the main station comprises a mesh belt machine, a strip cutting machine, a stirrer, a double-screw machine, an arch breaking machine, a conveying motor, a discharging machine, a feeding bin and a discharging bin, and the auxiliary station comprises a blower, a circulating fan, an electric heater and a compressor.
4. The control system of the low-temperature sludge drying equipment according to claim 3, characterized in that: the secondary station further comprises a radiator fan.
5. A control method of a low-temperature sludge drying device by using the control system of the low-temperature sludge drying device according to claim 3, which is characterized by comprising the following steps: when the control system of the sludge low-temperature drying equipment is switched into a manual control mode, rotating the manual/automatic change-over switch to the manual control mode; when the control system of the sludge low-temperature drying equipment is switched into an automatic control mode, rotating the manual/automatic change-over switch to the automatic control mode; and when the control system of the low-temperature sludge drying equipment is in an automatic control mode, pressing the automatic start/stop switch to start the automatic start system, and then pressing the automatic start/stop switch to start the automatic stop system.
6. The method for controlling the low-temperature sludge drying equipment according to claim 5, characterized in that: the control method of the automatic starting system comprises the following steps:
s1, the master station control system controls the master station to start; meanwhile, the master station control system sends a starting command to the secondary station control system, the secondary station control system is started, and the secondary station control system controls the blower to be started;
s2, the secondary station control system judges whether the blower has a fault or not, and when the blower has no fault, the secondary station control system controls the circulating fan to start;
s3, the secondary station control system judges whether the circulating fan has a fault, when the circulating fan has no fault, the secondary station control system judges whether the temperature of the mesh belt is lower than the electric heating auxiliary heating starting temperature, and when the temperature of the mesh belt is lower than the electric heating auxiliary heating starting temperature, the secondary station control system controls the electric heating starting;
s4, judging whether the mesh belt temperature is equal to the mesh belt set temperature or not by the auxiliary station control system, and controlling the compressor to start when the mesh belt temperature is equal to the mesh belt set temperature by the auxiliary station control system;
s5, the secondary station control system judges whether the compressor has a fault, and when the compressor has no fault, the secondary station control system sends a signal for finishing the starting of the secondary station to the primary station control system; the master station control system judges whether the mesh belt temperature is equal to the mesh belt set temperature or not, and controls the mesh belt machine to start when the mesh belt temperature is equal to the mesh belt set temperature;
s6, judging whether the mesh belt runs or not by the master station control system, and controlling the slitter and the stirrer to start when the mesh belt runs;
s7, the master station control system judges whether the slitter and the stirrer have faults or not, and when the slitter and the stirrer have no faults, the master station control system controls the double-screw machine, the arch breaking machine and the transmission motor to start and automatically feed the feeding bin;
s8, the main station control system judges whether the double-screw machine, the arch breaking machine and the conveying motor have faults or not, and when the double-screw machine, the arch breaking machine and the conveying motor have no faults, the main station control system controls the discharging machine to start, and materials are automatically discharged to the discharging bin.
7. The method for controlling the low-temperature sludge drying equipment according to claim 5, characterized in that: the control method of the automatic stop system comprises the following steps:
s1, the main station control system controls the double-screw machine, the arch breaking machine and the conveying motor to stop; meanwhile, the master station control system detects whether materials exist on the slitter, and when no materials exist on the slitter, the master station control system controls the slitter and the stirrer to stop; when materials exist in the slitting machine, the slitting machine and the stirrer normally operate, and the materials are conveyed to the mesh belt until no materials exist in the slitting machine;
s2, detecting whether a material exists on the mesh belt or not by the master station control system, and controlling the mesh belt machine and the discharging machine to stop when no material exists on the mesh belt by the master station control system; when the mesh belt is filled with materials, the mesh belt machine and the discharging machine normally operate, and the materials are conveyed into the discharging bin until no materials exist on the mesh belt; meanwhile, the master station control system sends a signal to the secondary station control system, the secondary station control system controls the compressor and the electric heating to stop, the compressor is stopped firstly, and then the electric heating is stopped;
and S3, after the electric heating is stopped for a set time, the secondary station control system controls the circulating fan and the blower to stop, the circulating fan is stopped firstly, and then the blower is stopped.
8. The method for controlling the low-temperature sludge drying equipment according to claim 5, characterized in that: the auxiliary station also comprises a radiator fan, and when the temperature of the mesh belt continuously exceeds the set temperature for a certain time, the radiator fan is started; stopping the compressor after the radiator fan is started for a set time; and when the temperature of the mesh belt returns to the normal set range, the radiator fan stops.
9. The method for controlling the low-temperature sludge drying equipment according to claim 5, characterized in that: the compressor is provided with protect function, works as the compressor is in under the low pressure of settlement, high pressure or high temperature, can start protect function, the alarm sends the suggestion, closes the compressor.
CN202010110742.5A 2020-02-24 2020-02-24 Control system and control method for low-temperature sludge drying equipment Pending CN111253038A (en)

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