An intelligent control system for sewage treatment

Abstract

The present invention provides an intelligent control system for sewage treatment, which relates to the technical field of sewage treatment. It includes a first circuit breaker, a second circuit breaker, a third circuit breaker, a fourth circuit breaker, a fifth circuit breaker, a soft starter, a first contactor, a second contactor, a third contactor, a fourth contactor, a fifth contactor, a sixth contactor, a seventh contactor, an eighth contactor, a first motor, a second motor, a third motor, a fourth motor, a PLC controller, a liquid crystal display, a liquid level transmitter, a temperature controller, a fan, a switch, and a host computer. The present invention takes the PLC controller as the core, detects the liquid level according to the liquid level transmitter, and intelligently controls the start or stop of the motor through the soft starter, realizing the automatic control of the sewage treatment system, effectively improving the sewage treatment quality and treatment speed, and realizing the intelligent control of sewage treatment.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and particularly relates to an intelligent control system for sewage treatment. Background Art

[0002] With the continuous development of urbanization and the continuous promotion of the goal of becoming a strong industrial country, the treatment of domestic sewage and industrial sewage has become increasingly prominent. In order to continuously improve the living environment, solve the current problems of water resource shortage and environmental pollution, and achieve sustainable economic development. Sewage lifting is an important link in sewage treatment. The capacity of sewage lifting should not only meet the demand of the sewage treatment plant for the total influent volume, but also be able to lift and treat urban sewage in a timely and reliable manner. The traditional sewage treatment control system uses relay control, which is difficult to achieve automatic control and can no longer meet the current sewage treatment requirements. Not only is the treatment efficiency low, but the treatment quality cannot be effectively guaranteed. Summary of the Invention

[0003] (1) Technical Problem to be Solved

[0004] Aiming at the defect that the above sewage treatment control system is difficult to achieve automatic control, the present invention provides an intelligent control system for sewage treatment, with a PLC controller as the core. It detects the liquid level according to the liquid level transmitter, and intelligently controls the start or stop of the motor through a soft starter to achieve the automatic control of the sewage treatment system, effectively improving the sewage treatment quality and treatment speed, and realizing the intelligent control of sewage treatment.

[0005] (2) Technical Solution

[0006] To achieve the above object, the present invention is realized through the following technical solutions:

[0007] An intelligent control system for sewage treatment includes a first circuit breaker, a second circuit breaker, a third circuit breaker, a fourth circuit breaker, a fifth circuit breaker, a soft starter, a first contactor, a second contactor, a third contactor, a fourth contactor, a fifth contactor, a sixth contactor, a seventh contactor, an eighth contactor, a first motor, a second motor, a third motor, a fourth motor, a PLC controller, a liquid crystal display, a liquid level transmitter, a temperature controller, a fan, a switch, and a host computer;

[0008] One end of the first circuit breaker, the second circuit breaker, the third circuit breaker, the fourth circuit breaker, and the fifth circuit breaker is connected to a three-phase power supply. The other end of the first circuit breaker is connected to a soft starter. One end of the soft starter is respectively connected to one end of the first contactor, the third contactor, and the fifth contactor. The other ends of the first contactor, the third contactor, and the fifth contactor are respectively connected to a first motor, a second motor, and a third motor. The other ends of the second circuit breaker, the third circuit breaker, and the fourth circuit breaker are respectively connected to one end of the second contactor, the fourth contactor, and the sixth contactor. The other ends of the second contactor, the fourth contactor, and the sixth contactor are respectively connected to the first motor, the second motor, and the third motor. The other end of the fifth circuit breaker is respectively connected to one end of the seventh contactor and the eighth contactor. The other ends of the seventh contactor and the eighth contactor are both connected to a fourth motor.

[0009] The switch is connected to the PLC controller. The PLC controller communicates with the upper computer through the switch in a wired or wireless manner. The liquid crystal display screen is connected to the PLC controller and is used for displaying the working state. The temperature controller is connected to the PLC controller. The PLC controller starts the fan through the temperature controller. The liquid level transmitter is connected to the PLC controller. The PLC controller is connected to the soft starter. The PLC controller controls the soft starter to start the corresponding motor according to the liquid level height.

[0010] According to an embodiment of the present invention, the main circuit of the intelligent control system includes three-phase power supply lines L1, L2, and L3, a first circuit breaker QF1, a second circuit breaker QF2, a third circuit breaker QF3, a fourth circuit breaker QF4, a fifth circuit breaker QF5, a soft starter RQ, a first contactor KM1, a second contactor KM2, a third contactor KM3, a fourth contactor KM4, a fifth contactor KM5, a sixth contactor KM6, a seventh contactor KM7, an eighth contactor KM8, a first motor M1, a second motor M2, a third motor M3, and a fourth motor M4; the three-phase power supply lines L1, L2, and L3 are respectively connected to the input ends of the first circuit breaker QF1, the second circuit breaker QF2, the third circuit breaker QF3, the fourth circuit breaker QF4, and the fifth circuit breaker QF5. The output end of the first circuit breaker QF1 is respectively connected to the three input ends R, S, and T of the soft starter RQ. The three output ends U, V, and W of the soft starter RQ are connected to the input ends of the first contactor KM1, the third contactor KM3, and the fifth contactor KM5. The output ends of the first contactor KM1, the third contactor KM3, and the fifth contactor KM5 are respectively connected to the first motor M1, the second motor M2, and the third motor M3; the first motor M1 is connected; the output ends of the second circuit breaker QF2, the third circuit breaker QF3, and the fourth circuit breaker QF4 are respectively connected to the input ends of the second contactor KM2, the fourth contactor KM4, and the sixth contactor KM6. The output ends of the second contactor KM2, the fourth contactor KM4, and the sixth contactor KM6 are respectively connected to the first motor M1, the second motor M2, and the third motor M3; the output end of the fifth circuit breaker QF5 is respectively connected to the input ends of the seventh contactor KM7 and the eighth contactor KM8. The output ends of the seventh contactor KM7 and the eighth contactor KM8 are both connected to the fourth motor M4.

[0011] According to an embodiment of the present invention, the control circuit of the intelligent control system includes a sixth circuit breaker QF101, a first intermediate relay KA1, a second intermediate relay KA2, a third intermediate relay KA3, a fourth intermediate relay KA4, a fifth intermediate relay KA5, a sixth intermediate relay KA6, a seventh intermediate relay KA7, an eighth intermediate relay KA8, a first change-over switch SA1, a second change-over switch SA2, a third change-over switch SA3, a first push button SB1, a second push button SB2, a third push button SB3, a fourth push button SB4, a fifth push button SB5, a sixth push button SB6, a first contactor KM1, a second contactor KM2, a third contactor KM3, a fourth contactor KM4, a fifth contactor KM5, a sixth contactor KM6, a first motor stop indicator HR1, a second motor stop indicator HR2, and a third motor stop indicator HR3.

[0012] One end of the sixth circuit breaker QF101 is connected to a phase power supply line L1, and the other terminal of the sixth circuit breaker QF101 is 101, which is respectively connected to one end of the normally closed contact KM1-1 of the first contactor, one end of the normally closed contact KM3-2 of the third contactor, one end of the normally closed contact KM5-3 of the fifth contactor, one end of the normally open contact of the third intermediate relay KA3, one end of the normally open contact of the fourth intermediate relay KA4, and one end of the normally open contact of the fifth intermediate relay KA5.

[0013] The other end of the normally closed contact KM1-1 of the first contactor is connected to one end of the normally closed contact KM2-1 of the second contactor. The other end of the normally closed contact KM2-1 of the second contactor is connected to one end of the stop indicator HR1 of the first motor. The other end of the stop indicator HR1 of the first motor is connected to the neutral line N. The other end of the normally closed contact KM3-2 of the third contactor is connected to one end of the normally closed contact KM4-1 of the fourth contactor. The other end of the normally closed contact KM4-1 of the fourth contactor is connected to one end of the stop indicator HR2 of the second motor. The other end of the stop indicator HR2 of the second motor is connected to the neutral line N. The other end of the normally closed contact KM5-3 of the fifth contactor is connected to one end of the normally closed contact KM6-1 of the sixth contactor. The other end of the normally closed contact KM6-1 of the sixth contactor is connected to one end of the stop indicator HR3 of the third motor. The other end of the stop indicator HR3 of the third motor is connected to the neutral line N.

[0014] The other end of the normally open contact of the third intermediate relay KA3 is connected to pin 3 of the first changeover switch SA1. Pin 4 of the first changeover switch SA1 is connected to one end of the first push button SB1. The other end of the first push button SB1 is connected to one end of the second push button SB2, one end of the normally open contact KM1-2 of the first contactor, and one end of the normally open contact KM2-3 of the second contactor. The other end of the second push button SB2 is connected to the other end of the normally open contact KM1-2 of the first contactor. The other end of the normally open contact KM2-3 of the second contactor is connected to one end of the coil of the second contactor KM2. The other end of the coil of the second contactor KM2 is connected to the neutral line N. There is a normally open contact KA1-1 of the first intermediate relay connected between the other end of the normally open contact KM1-2 of the first contactor and the other end of the normally open contact KM2-3 of the second contactor. There is a normally open contact KM2-4 of the second contactor connected in parallel across the two ends of the normally open contact KA1-1 of the first intermediate relay. Pin 2 of the first changeover switch SA1 is connected to one end of the normally open contact of the sixth intermediate relay KA6. The other end of the normally open contact of the sixth intermediate relay KA6 is connected to the other end of the second push button SB2 and one end of the normally closed contact KM2-2 of the second contactor. The other end of the normally closed contact KM2-2 of the second contactor is connected to one end of the normally closed contact KM3-1 of the third contactor. The other end of the normally closed contact KM3-1 of the third contactor is connected to one end of the normally closed contact KM5-1 of the fifth contactor. The other end of the normally closed contact KM5-1 of the fifth contactor is connected to one end of the coil of the first contactor KM1. The other end of the coil of the first contactor KM1 is connected to the neutral line N.

[0015] The other end of the normally open contact of the fourth intermediate relay KA4 is connected to pin 3 of the second changeover switch SA2. Pin 4 of the second changeover switch SA2 is connected to one end of the third push button SB3. The other end of the third push button SB3 is connected to one end of the fourth push button SB4, one end of the normally open contact KM3-3 of the third contactor, and one end of the normally open contact KM4-3 of the fourth contactor. The other end of the fourth push button SB4 is connected to the other end of the normally open contact KM3-3 of the third contactor. The other end of the normally open contact KM4-3 of the fourth contactor is connected to one end of the coil of the fourth contactor KM4. The other end of the coil of the fourth contactor KM4 is connected to the neutral line N. There is a normally open contact KA1-2 of the first intermediate relay connected to the other end of the normally open contact KM3-3 of the third contactor and the other end of the normally open contact KM4-3 of the fourth contactor. There is a normally open contact KM4-4 of the fourth contactor connected in parallel across both ends of the normally open contact KA1-2 of the first intermediate relay. Pin 2 of the second changeover switch SA2 is connected to one end of the normally open contact of the seventh intermediate relay KA7. The other end of the normally open contact of the seventh intermediate relay KA7 is connected to the other end of the fourth push button SB4 and one end of the normally closed contact KM4-2 of the fourth contactor. The other end of the normally closed contact KM4-2 of the fourth contactor is connected to one end of the normally closed contact KM1-3 of the first contactor. The other end of the normally closed contact KM1-3 of the first contactor is connected to one end of the normally closed contact KM5-2 of the fifth contactor. The other end of the normally closed contact KM5-2 of the fifth contactor is connected to one end of the coil of the third contactor KM3. The other end of the coil of the third contactor KM3 is connected to the neutral line N.

[0016] The other end of the normally open contact of the fifth intermediate relay KA5 is connected to pin 3 of the third changeover switch SA3. Pin 4 of the third changeover switch SA3 is connected to one end of the fifth push button SB5. The other end of the fifth push button SB5 is connected to one end of the sixth push button SB6, one end of the normally open contact KM5-4 of the fifth contactor, and one end of the normally open contact KM6-3 of the sixth contactor. The other end of the sixth push button SB6 is connected to the other end of the normally open contact KM5-4 of the fifth contactor. The other end of the normally open contact KM6-3 of the sixth contactor is connected to one end of the coil of the sixth contactor KM6. The other end of the coil of the sixth contactor KM6 is connected to the neutral line N. There is a normally open contact KA1-3 of the first intermediate relay connected to the other end of the normally open contact KM5-4 of the fifth contactor and the other end of the normally open contact KM6-3 of the sixth contactor. There is a normally open contact KM6-4 of the sixth contactor connected in parallel across both ends of the normally open contact KA1-3 of the first intermediate relay. Pin 2 of the third changeover switch SA3 is connected to one end of the normally open contact of the eighth intermediate relay KA8. The other end of the normally open contact of the eighth intermediate relay KA8 is connected to the other end of the sixth push button SB6 and one end of the normally closed contact KM6-2 of the sixth contactor. The other end of the normally closed contact KM6-2 of the sixth contactor is connected to one end of the normally closed contact KM1-4 of the first contactor. The other end of the normally closed contact KM1-4 of the first contactor is connected to one end of the normally closed contact KM3-4 of the third contactor. The other end of the normally closed contact KM3-4 of the third contactor is connected to one end of the coil of the fifth contactor KM5. The other end of the coil of the fifth contactor KM5 is connected to the neutral line N.

[0017] According to an embodiment of the present invention, the control circuit of the intelligent control system further includes a first motor fault relay FM1, a second motor fault relay FM2, a third motor fault relay FM3, a first motor fault indicator light HY1, a second motor fault indicator light HY2, a third motor fault indicator light HY3, and a fan relay FS. One end of the normally closed contact of the first motor fault relay FM1, one end of the normally closed contact of the second motor fault relay FM2, and one end of the normally closed contact of the third motor fault relay FM3 are respectively connected to the other end of the sixth circuit breaker QF101. One end of the normally closed contact of the first motor fault relay FM1 is connected to one end of the coil of the third intermediate relay KA3, and the other end of the coil of the third intermediate relay KA3 is connected to the neutral line N. The other end of the normally closed contact of the second motor fault relay FM2 is connected to one end of the coil of the fourth intermediate relay KA4, and the other end of the coil of the fourth intermediate relay KA4 is connected to the neutral line N. The other end of the normally closed contact of the third motor fault relay FM3 is connected to one end of the coil of the fifth intermediate relay KA5, and the other end of the coil of the fifth intermediate relay KA5 is connected to the neutral line N; One end of the normally closed contact of the third intermediate relay KA3, one end of the normally closed contact of the fourth intermediate relay KA4, and one end of the normally closed contact of the fifth intermediate relay KA5 are respectively connected to the other end of the sixth circuit breaker QF101. The other end of the normally closed contact of the third intermediate relay KA3 is connected to one end of the first motor fault indicator light HY1, and the other end of the first motor fault indicator light HY1 is connected to the neutral line N. The other end of the normally closed contact of the fourth intermediate relay KA4 is connected to one end of the second motor fault indicator light HY2, and the other end of the second motor fault indicator light HY2 is connected to the neutral line N. The other end of the normally closed contact of the fifth intermediate relay KA5 is connected to one end of the third motor fault indicator light HY3, and the other end of the third motor fault indicator light HY3 is connected to the neutral line N; The 1 and 2 terminals of the soft starter RQ are normally open contacts of the bypass relay. The 1 terminal of the soft starter RQ is connected to the other end of the sixth circuit breaker QF101, and the 2 terminal of the soft starter RQ is connected to one end of the coil of the first intermediate relay KA1, and the other end of the coil of the first intermediate relay KA1 is connected to the neutral line N; One end of the normally open contact KM1-5 of the first contactor, one end of the normally open contact KM3-5 of the third contactor, and one end of the normally open contact KM5-5 of the fifth contactor are respectively connected to the other end of the sixth circuit breaker QF101. The other end of the normally open contact KM1-5 of the first contactor, the other end of the normally open contact KM3-5 of the third contactor, and the other end of the normally open contact KM5-5 of the fifth contactor are respectively connected to one end of the coil of the second intermediate relay KA2, and the other end of the coil of the second intermediate relay KA2 is connected to the neutral line N;One end of the normally open contact KM2-5 of the second contactor, one end of the normally open contact KM4-5 of the fourth contactor, and one end of the normally open contact KM6-5 of the sixth contactor are respectively connected to the other end of the sixth circuit breaker QF101. The other end of the normally open contact KM2-5 of the second contactor, the other end of the normally open contact KM4-5 of the fourth contactor, and the other end of the normally open contact KM6-5 of the sixth contactor are respectively connected to one end of the coil of the fan relay FS. The other end of the coil of the fan relay FS is connected to the neutral line N.

[0018] According to an embodiment of the present invention, the forward and reverse control circuit of the fourth motor M4 includes the ninth intermediate relay KA9, the tenth intermediate relay KA10, the eleventh intermediate relay KA11, the fourth changeover switch SA4, the seventh push button SB7, the eighth push button SB8, the ninth push button SB9, the seventh contactor KM7, the eighth contactor KM8, the forward rotation indicator light HR4 of the fourth motor, the reverse rotation indicator light HR5 of the fourth motor, and the stop indicator light HR6 of the fourth motor. One end of the normally closed contact of the ninth intermediate relay KA9 is connected to the other end of the sixth circuit breaker QF101. The other end of the normally closed contact of the ninth intermediate relay KA9 is connected to the 3rd pin of the fourth changeover switch SA4. The 4th pin of the fourth changeover switch SA4 is connected to one end of the seventh push button SB7. The other end of the seventh push button SB7 is respectively connected to one end of the eighth push button SB8 and one end of the ninth push button SB9. The 2nd pin of the fourth changeover switch SA4 is connected to one end of the normally open contact of the tenth intermediate relay KA10 and one end of the normally open contact of the eleventh intermediate relay KA11. The other end of the normally open contact of the tenth intermediate relay KA10 is respectively connected to the other end of the eighth push button SB8 and one end of the normally closed contact KM8-1 of the eighth contactor. The other end of the normally closed contact KM8-1 of the eighth contactor is respectively connected to one end of the coil of the seventh contactor KM7 and one end of the forward rotation indicator light HR4 of the fourth motor. The other end of the coil of the seventh contactor KM7 and the other end of the forward rotation indicator light HR4 of the fourth motor are connected to the neutral line N. The other end of the normally open contact of the eleventh intermediate relay KA11 is respectively connected to the other end of the ninth push button SB9 and one end of the normally closed contact KM7-2 of the seventh contactor. The other end of the normally closed contact KM7-2 of the seventh contactor is respectively connected to one end of the coil of the eighth contactor KM8 and one end of the reverse rotation indicator light HR5 of the fourth motor. The other end of the coil of the eighth contactor KM8 and the other end of the reverse rotation indicator light HR5 of the fourth motor are connected to the neutral line N. The normally open contact KM7-1 of the seventh contactor is connected in parallel across the two ends of the eighth push button SB8. The normally open contact KM8-2 of the eighth contactor is connected in parallel across the two ends of the ninth push button SB9. One end of the normally closed contact KM7-3 of the seventh contactor is connected to the other end of the sixth circuit breaker QF101. The other end of the normally closed contact KM7-3 of the seventh contactor is connected to one end of the normally closed contact KM8-3 of the eighth contactor. The other end of the normally closed contact KM8-3 of the eighth contactor is connected to one end of the stop indicator light HR6 of the fourth motor. The other end of the stop indicator light HR6 of the fourth motor is connected to the neutral line N.

[0019] According to an embodiment of the present invention, the soft starter (RQ) is Delixi soft starter CDRA015T4.

[0020] According to an embodiment of the present invention, the PLC controller is Siemens S7-1500.

[0021] According to an embodiment of the present invention, the liquid crystal display screen is Siemens 6AV6.

[0022] (III) Beneficial effects

[0023] The beneficial effects of the present invention: An intelligent control system for sewage treatment includes a soft starter, four motors, a switch, and a changeover switch. Three motors are controlled by the soft starter to start, and different motors are controlled to start according to the liquid level transmitter; the grille motor can be controlled for forward and reverse rotation; the motors can be controlled manually and automatically by the PLC, and the manual and PLC automatic controls are switched through the changeover switch; the upper computer communicates remotely with the PLC controller through the switch, and the upper computer can monitor and remotely control the control system; realizing the automatic control of the sewage treatment system, effectively improving the sewage treatment quality and treatment speed, and realizing the intelligent control of sewage treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0025] Figure 1 It is the principle block diagram of the present invention;

[0026] Figure 2 It is the main circuit schematic diagram of the present invention;

[0027] Figure 3 It is the control circuit schematic diagram of motors M1, M2, and M3;

[0028] Figure 4 It is the fault indication schematic diagram of motors M1, M2, and M3;

[0029] Figure 5 It is the control circuit schematic diagram of motor M4.

[0030] Description of the reference numerals:

[0031] L1, L2, L3: Three-phase power lines; N: Neutral line;

[0032] QF1: First circuit breaker; QF2: Second circuit breaker; QF3: Third circuit breaker; QF4: Fourth circuit breaker; QF5: Fifth circuit breaker; QF101: Sixth circuit breaker; RQ: Soft starter; FS: Fan; M1: First motor; M2: Second motor; M3: Third motor; M4: Fourth motor;

[0033] SA1: First transfer switch; SA2: Second transfer switch; SA3: Third transfer switch; SA4: Fourth transfer switch; SB1: First button; SB2: Second button; SB3: Third button; SB4: Fourth button; SB5: Fifth button; SB6: Sixth button; SB7: Seventh button; SB8: Eighth button; SB9: Ninth button;

[0034] KM1: First contactor, KM1-1, KM1-2, KM1-3, KM1-4, KM1-5 are auxiliary contacts of the first contactor; KM2: Second contactor, KM2-1, KM2-2, KM2-3, KM2-4, KM3-5 are auxiliary contacts of the second contactor; KM3: Third contactor, KM3-1, KM3-2, KM3-3, KM3-4, KM3-5 are auxiliary contacts of the third contactor; KM4: Fourth contactor, KM4-1, KM4-2, KM4-3, KM4-4, KM4-5 are auxiliary contacts of the fourth contactor; KM5: Fifth contactor, KM5-1, KM5-2, KM5-3, KM5-4, KM5-5 are auxiliary contacts of the fifth contactor; KM6: Sixth contactor, KM6-1, KM6-2, KM6-3, KM6-4, KM6-5 are auxiliary contacts of the sixth contactor; KM7: Seventh contactor, KM7-1, KM7-2, KM7-3 are auxiliary contacts of the seventh contactor; KM8: Eighth contactor, KM8-1, KM8-2, KM8-3 are auxiliary contacts of the eighth contactor;

[0035] HR1: First motor stop indicator light; HR2: Second motor stop indicator light; HR3: Third motor stop indicator light; HR4: Fourth motor forward rotation indicator light; HR5: Fourth motor reverse rotation indicator light; HR6: Fourth motor stop indicator light; HY1: First motor fault indicator light; HY2: Second motor fault indicator light; HY3: Third motor fault indicator light;

[0036] KA1: First intermediate relay, KA1-1, KA1-2, and KA1-3 are normally open contacts of the first intermediate relay; KA2: Second intermediate relay; KA3: Third intermediate relay; KA4: Fourth intermediate relay; KA5: Fifth intermediate relay; KA6: Sixth intermediate relay; KA7: Seventh intermediate relay; KA8: Eighth intermediate relay; KA9: Ninth intermediate relay; KA10: Tenth intermediate relay; KA11: Eleventh intermediate relay; FM1: First motor fault relay; FM2: Second motor fault relay; FM3: Third motor fault relay. Detailed implementation manners

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] Combined with Figure 1 , an intelligent control system for sewage treatment includes a first circuit breaker, a second circuit breaker, a third circuit breaker, a fourth circuit breaker, a fifth circuit breaker, a soft starter, a first contactor, a second contactor, a third contactor, a fourth contactor, a fifth contactor, a sixth contactor, a seventh contactor, an eighth contactor, a first motor, a second motor, a third motor, a fourth motor, a PLC controller, a liquid crystal display, a liquid level transmitter, a temperature controller, a fan, a switch, and a host computer.

[0039] One end of the first circuit breaker, the second circuit breaker, the third circuit breaker, the fourth circuit breaker, and the fifth circuit breaker is connected to the power supply. The other end of the first circuit breaker is connected to the soft starter. One end of the soft starter is respectively connected to one end of the first contactor, the third contactor, and the fifth contactor. The other ends of the first contactor, the third contactor, and the fifth contactor are respectively connected to the first motor, the second motor, and the third motor. The other ends of the second circuit breaker, the third circuit breaker, and the fourth circuit breaker are respectively connected to one end of the second contactor, the fourth contactor, and the sixth contactor. The other ends of the second contactor, the fourth contactor, and the sixth contactor are respectively connected to the first motor, the second motor, and the third motor. The other end of the fifth circuit breaker is respectively connected to one end of the seventh contactor and the eighth contactor. The other ends of the seventh contactor and the eighth contactor are both connected to the fourth motor. The switch is connected to the PLC controller. The PLC controller communicates with the upper computer through the switch in a wired or wireless manner. The liquid crystal display screen is connected to the PLC controller and is used for displaying the working state. The temperature controller is connected to the PLC controller. The PLC controller starts the fan FS through the temperature controller. The liquid level transmitter is connected to the PLC controller. The PLC controller is connected to the soft starter RQ. The PLC controller controls the soft starter to start the corresponding motor according to the liquid level height.

[0040] The intelligent control system for sewage treatment includes a main circuit and a control circuit.

[0041] Combined with Figure 2The main circuit of the intelligent control system for sewage treatment includes three-phase power lines L1, L2, and L3, the first circuit breaker QF1, the second circuit breaker QF2, the third circuit breaker QF3, the fourth circuit breaker QF4, the fifth circuit breaker QF5, the soft starter RQ, the first contactor KM1, the second contactor KM2, the third contactor KM3, the fourth contactor KM4, the fifth contactor KM5, the sixth contactor KM6, the seventh contactor KM7, the eighth contactor KM8, the first motor M1, the second motor M2, the third motor M3, and the fourth motor M4. The three-phase power lines L1, L2, and L3 are respectively connected to the input ends of the first circuit breaker QF1, the second circuit breaker QF2, the third circuit breaker QF3, the fourth circuit breaker QF4, and the fifth circuit breaker QF5. The output end of the first circuit breaker QF1 is respectively connected to the three input ends R, S, and T of the soft starter RQ. The three output ends U, V, and W of the soft starter RQ are connected to the input ends of the first contactor KM1, the third contactor KM3, and the fifth contactor KM5. The output ends of the first contactor KM1, the third contactor KM3, and the fifth contactor KM5 are respectively connected to the first motor M1, the second motor M2, and the third motor M3. The first motor M1 is connected. The output ends of the second circuit breaker QF2, the third circuit breaker QF3, and the fourth circuit breaker QF4 are respectively connected to the input ends of the second contactor KM2, the fourth contactor KM4, and the sixth contactor KM6. The output ends of the second contactor KM2, the fourth contactor KM4, and the sixth contactor KM6 are respectively connected to the first motor M1, the second motor M2, and the third motor M3. The output end of the fifth circuit breaker QF5 is respectively connected to the input ends of the seventh contactor KM7 and the eighth contactor KM8. The output ends of the seventh contactor KM7 and the eighth contactor KM8 are both connected to the fourth motor M4.

[0042] Combined with Figure 3 The control circuit of the intelligent control system for sewage treatment includes the sixth circuit breaker QF101, the first intermediate relay KA1, the second intermediate relay KA2, the third intermediate relay KA3, the fourth intermediate relay KA4, the fifth intermediate relay KA5, the sixth intermediate relay KA6, the seventh intermediate relay KA7, the eighth intermediate relay KA8, the first change-over switch SA1, the second change-over switch SA2, the third change-over switch SA3, the first push button SB1, the second push button SB2, the third push button SB3, the fourth push button SB4, the fifth push button SB5, the sixth push button SB6, the first contactor KM1, the second contactor KM2, the third contactor KM3, the fourth contactor KM4, the fifth contactor KM5, the sixth contactor KM6, the stop indicator HR1 of the first motor, the stop indicator HR2 of the second motor, and the stop indicator HR3 of the third motor.

[0043] One end of the sixth circuit breaker QF101 is connected to a phase power line L1, and the other terminal of the sixth circuit breaker QF101 is 101, which is respectively connected to one end of the normally closed contact KM1-1 of the first contactor, one end of the normally closed contact KM3-2 of the third contactor, one end of the normally closed contact KM5-3 of the fifth contactor, one end of the normally open contact of the third intermediate relay KA3, one end of the normally open contact of the fourth intermediate relay KA4, and one end of the normally open contact of the fifth intermediate relay KA5.

[0044] The other end of the normally closed contact KM1-1 of the first contactor is connected to one end of the normally closed contact KM2-1 of the second contactor. The other end of the normally closed contact KM2-1 of the second contactor is connected to one end of the stop indicator HR1 of the first motor. The other end of the stop indicator HR1 of the first motor is connected to the neutral line N. The other end of the normally closed contact KM3-2 of the third contactor is connected to one end of the normally closed contact KM4-1 of the fourth contactor. The other end of the normally closed contact KM4-1 of the fourth contactor is connected to one end of the stop indicator HR2 of the second motor. The other end of the stop indicator HR2 of the second motor is connected to the neutral line N. The other end of the normally closed contact KM5-3 of the fifth contactor is connected to one end of the normally closed contact KM6-1 of the sixth contactor. The other end of the normally closed contact KM6-1 of the sixth contactor is connected to one end of the stop indicator HR3 of the third motor. The other end of the stop indicator HR3 of the third motor is connected to the neutral line N.

[0045] The other end of the normally open contact of the third intermediate relay KA3 is connected to pin 3 of the first changeover switch SA1. Pin 4 of the first changeover switch SA1 is connected to one end of the first button SB1. The other end of the first button SB1 is connected to one end of the second button SB2, one end of the normally open contact KM1-2 of the first contactor, and one end of the normally open contact KM2-3 of the second contactor. The other end of the second button SB2 is connected to the other end of the normally open contact KM1-2 of the first contactor. The other end of the normally open contact KM2-3 of the second contactor is connected to one end of the coil of the second contactor KM2. The other end of the coil of the second contactor KM2 is connected to the neutral line N. There is a normally open contact KA1-1 of the first intermediate relay connected between the other end of the normally open contact KM1-2 of the first contactor and the other end of the normally open contact KM2-3 of the second contactor. There is a normally open contact KM2-4 of the second contactor connected in parallel across both ends of the normally open contact KA1-1 of the first intermediate relay. Pin 2 of the first changeover switch SA1 is connected to one end of the normally open contact of the sixth intermediate relay KA6. The other end of the normally open contact of the sixth intermediate relay KA6 is connected to the other end of the second button SB2 and one end of the normally closed contact KM2-2 of the second contactor. The other end of the normally closed contact KM2-2 of the second contactor is connected to one end of the normally closed contact KM3-1 of the third contactor. The other end of the normally closed contact KM3-1 of the third contactor is connected to one end of the normally closed contact KM5-1 of the fifth contactor. The other end of the normally closed contact KM5-1 of the fifth contactor is connected to one end of the coil of the first contactor KM1. The other end of the coil of the first contactor KM1 is connected to the neutral line N.

[0046] The other end of the normally open contact of the fourth intermediate relay KA4 is connected to the 3rd pin of the second changeover switch SA2. The 4th pin of the second changeover switch SA2 is connected to one end of the third push button SB3. The other end of the third push button SB3 is connected to one end of the fourth push button SB4, one end of the normally open contact KM3-3 of the third contactor, and one end of the normally open contact KM4-3 of the fourth contactor. The other end of the fourth push button SB4 is connected to the other end of the normally open contact KM3-3 of the third contactor. The other end of the normally open contact KM4-3 of the fourth contactor is connected to one end of the coil of the fourth contactor KM4. The other end of the coil of the fourth contactor KM4 is connected to the neutral line N. There is a normally open contact KA1-2 of the first intermediate relay connected to the other end of the normally open contact KM3-3 of the third contactor and the other end of the normally open contact KM4-3 of the fourth contactor. There is a normally open contact KM4-4 of the fourth contactor connected in parallel across both ends of the normally open contact KA1-2 of the first intermediate relay. The 2nd pin of the second changeover switch SA2 is connected to one end of the normally open contact of the seventh intermediate relay KA7. The other end of the normally open contact of the seventh intermediate relay KA7 is connected to the other end of the fourth push button SB4 and one end of the normally closed contact KM4-2 of the fourth contactor. The other end of the normally closed contact KM4-2 of the fourth contactor is connected to one end of the normally closed contact KM1-3 of the first contactor. The other end of the normally closed contact KM1-3 of the first contactor is connected to one end of the normally closed contact KM5-2 of the fifth contactor. The other end of the normally closed contact KM5-2 of the fifth contactor is connected to one end of the coil of the third contactor KM3. The other end of the coil of the third contactor KM3 is connected to the neutral line N.

[0047] The other end of the normally open contact of the fifth intermediate relay KA5 is connected to pin 3 of the third changeover switch SA3. Pin 4 of the third changeover switch SA3 is connected to one end of the fifth push button SB5. The other end of the fifth push button SB5 is connected to one end of the sixth push button SB6, one end of the normally open contact KM5-4 of the fifth contactor, and one end of the normally open contact KM6-3 of the sixth contactor. The other end of the sixth push button SB6 is connected to the other end of the normally open contact KM5-4 of the fifth contactor. The other end of the normally open contact KM6-3 of the sixth contactor is connected to one end of the coil of the sixth contactor KM6. The other end of the coil of the sixth contactor KM6 is connected to the neutral line N. The normally open contact KA1-3 of the first intermediate relay is connected to the other end of the normally open contact KM5-4 of the fifth contactor and the other end of the normally open contact KM6-3 of the sixth contactor. The normally open contact KM6-4 of the sixth contactor is connected in parallel across both ends of the normally open contact KA1-3 of the first intermediate relay. Pin 2 of the third changeover switch SA3 is connected to one end of the normally open contact of the eighth intermediate relay KA8. The other end of the normally open contact of the eighth intermediate relay KA8 is connected to the other end of the sixth push button SB6 and one end of the normally closed contact KM6-2 of the sixth contactor. The other end of the normally closed contact KM6-2 of the sixth contactor is connected to one end of the normally closed contact KM1-4 of the first contactor. The other end of the normally closed contact KM1-4 of the first contactor is connected to one end of the normally closed contact KM3-4 of the third contactor. The other end of the normally closed contact KM3-4 of the third contactor is connected to one end of the coil of the fifth contactor KM5. The other end of the coil of the fifth contactor KM5 is connected to the neutral line N.

[0048] Combined with Figure 4, the control circuit of the intelligent control system for sewage treatment further includes a first motor fault relay FM1, a second motor fault relay FM2, a third motor fault relay FM3, a first motor fault indicator light HY1, a second motor fault indicator light HY2, a third motor fault indicator light HY3, and a fan relay FS. One end of the normally closed contact of the first motor fault relay FM1, one end of the normally closed contact of the second motor fault relay FM2, and one end of the normally closed contact of the third motor fault relay FM3 are respectively connected to the other end of the sixth circuit breaker QF101. One end of the normally closed contact of the first motor fault relay FM1 is connected to one end of the coil of the third intermediate relay KA3, and the other end of the coil of the third intermediate relay KA3 is connected to the neutral line N. The other end of the normally closed contact of the second motor fault relay FM2 is connected to one end of the coil of the fourth intermediate relay KA4, and the other end of the coil of the fourth intermediate relay KA4 is connected to the neutral line N. The other end of the normally closed contact of the third motor fault relay FM3 is connected to one end of the coil of the fifth intermediate relay KA5, and the other end of the coil of the fifth intermediate relay KA5 is connected to the neutral line N; One end of the normally closed contact of the third intermediate relay KA3, one end of the normally closed contact of the fourth intermediate relay KA4, and one end of the normally closed contact of the fifth intermediate relay KA5 are respectively connected to the other end of the sixth circuit breaker QF101. The other end of the normally closed contact of the third intermediate relay KA3 is connected to one end of the first motor fault indicator light HY1, and the other end of the first motor fault indicator light HY1 is connected to the neutral line N. The other end of the normally closed contact of the fourth intermediate relay KA4 is connected to one end of the second motor fault indicator light HY2, and the other end of the second motor fault indicator light HY2 is connected to the neutral line N. The other end of the normally closed contact of the fifth intermediate relay KA5 is connected to one end of the third motor fault indicator light HY3, and the other end of the third motor fault indicator light HY3 is connected to the neutral line N; The 1 and 2 terminals of the soft starter RQ are the normally open contacts of the bypass relay. The 1 terminal of the soft starter RQ is connected to the other end of the sixth circuit breaker QF101, and the 2 terminal of the soft starter RQ is connected to one end of the coil of the first intermediate relay KA1, and the other end of the coil of the first intermediate relay KA1 is connected to the neutral line N; One end of the normally open contact KM1-5 of the first contactor, one end of the normally open contact KM3-5 of the third contactor, and one end of the normally open contact KM5-5 of the fifth contactor are respectively connected to the other end of the sixth circuit breaker QF101. The other ends of the normally open contact KM1-5 of the first contactor, the normally open contact KM3-5 of the third contactor, and the normally open contact KM5-5 of the fifth contactor are respectively connected to one end of the coil of the second intermediate relay KA2, and the other end of the coil of the second intermediate relay KA2 is connected to the neutral line N;One end of the normally open contact KM2-5 of the second contactor, one end of the normally open contact KM4-5 of the fourth contactor, and one end of the normally open contact KM6-5 of the sixth contactor are respectively connected to the other end of the sixth circuit breaker QF101. The other ends of the normally open contact KM2-5 of the second contactor, the normally open contact KM4-5 of the fourth contactor, and the normally open contact KM6-5 of the sixth contactor are respectively connected to one end of the coil of the fan relay FS. The other end of the coil of the fan relay FS is connected to the neutral line N.

[0049] Combined with Figure 5 , the forward and reverse control circuit of the fourth motor M4 includes the ninth intermediate relay KA9, the tenth intermediate relay KA10, the eleventh intermediate relay KA11, the fourth changeover switch SA4, the seventh push button SB7, the eighth push button SB8, the ninth push button SB9, the seventh contactor KM7, the eighth contactor KM8, the forward rotation indicator HR4 of the fourth motor, the reverse rotation indicator HR5 of the fourth motor, and the stop indicator HR6 of the fourth motor. One end of the normally closed contact of the ninth intermediate relay KA9 is connected to the other end of the sixth circuit breaker QF101. The other end of the normally closed contact of the ninth intermediate relay KA9 is connected to the 3rd pin of the fourth changeover switch SA4. The 4th pin of the fourth changeover switch SA4 is connected to one end of the seventh push button SB7. The other end of the seventh push button SB7 is respectively connected to one end of the eighth push button SB8 and one end of the ninth push button SB9. The 2nd pin of the fourth changeover switch SA4 is connected to one end of the normally open contact of the tenth intermediate relay KA10 and one end of the normally open contact of the eleventh intermediate relay KA11. The other end of the normally open contact of the tenth intermediate relay KA10 is respectively connected to the other end of the eighth push button SB8 and one end of the normally closed contact KM8-1 of the eighth contactor. The other end of the normally closed contact KM8-1 of the eighth contactor is respectively connected to one end of the coil of the seventh contactor KM7 and one end of the forward rotation indicator HR4 of the fourth motor. The other end of the coil of the seventh contactor KM7 and the other end of the forward rotation indicator HR4 of the fourth motor are connected to the neutral line N. The other end of the normally open contact of the eleventh intermediate relay KA11 is respectively connected to the other end of the ninth push button SB9 and one end of the normally closed contact KM7-2 of the seventh contactor. The other end of the normally closed contact KM7-2 of the seventh contactor is respectively connected to one end of the coil of the eighth contactor KM8 and one end of the reverse rotation indicator HR5 of the fourth motor. The other end of the coil of the eighth contactor KM8 and the other end of the reverse rotation indicator HR5 of the fourth motor are connected to the neutral line N. There is a normally open contact KM7-1 of the seventh contactor connected in parallel across the two ends of the eighth push button SB8. There is a normally open contact KM8-2 of the eighth contactor connected in parallel across the two ends of the ninth push button SB9. One end of a normally closed contact KM7-3 of the seventh contactor is connected to the other end of the sixth circuit breaker QF101. The other end of the normally closed contact KM7-3 of the seventh contactor is connected to one end of the normally closed contact KM8-3 of the eighth contactor. The other end of the normally closed contact KM8-3 of the eighth contactor is connected to one end of the stop indicator HR6 of the fourth motor. The other end of the stop indicator HR6 of the fourth motor is connected to the neutral line N.

[0050] During specific operation, the PLC controller uses Siemens S7-1500; the soft starter uses Delixi soft starter CDRA015T4; the liquid crystal display is Siemens 6AV6. The first circuit breaker controls the power on or off of the soft starter. The first contactor, the third contactor, and the fifth contactor are respectively used for the soft start control of the first motor, the second motor, and the third motor. After the soft start of the first motor, the second motor, and the third motor, the corresponding second contactor, the fourth contactor, and the sixth contactor are turned on, the motors run normally, and the soft starter exits the soft start. The first motor, the second motor, and the third motor are controlled by a liquid level transmitter. According to the sewage liquid level height detected by the liquid level transmitter, the corresponding motors are started through PLC control or manual control. The manual control and the PLC automatic control are switched through the first changeover switch, the second changeover switch, and the third changeover switch. The fourth motor is a grille motor, and the grille motor can rotate forward and backward. The grille motor is controlled by PLC or manually, and the PLC automatic control and the manual control are switched through the fourth changeover switch. The liquid crystal display and the indicator lights are used to display the operating status of the motors. The PLC controller communicates remotely with the upper computer through a switch, and the upper computer can monitor and remotely control the sewage treatment system.

[0051] In summary, the embodiment of the present invention, an intelligent control system for sewage treatment, includes a soft starter, four motors, a switch, and changeover switches. The soft starter is used to control the start of three motors, and different motors are started according to the liquid level transmitter; the grille motor can be controlled to rotate forward and backward; the motors can be controlled manually and automatically by PLC, and the manual control and the PLC automatic control are switched through the changeover switches; the upper computer communicates remotely with the PLC controller through a switch, and the upper computer can monitor and remotely control the control system; realizing the automatic control of the sewage treatment system, effectively improving the sewage treatment quality and treatment speed, and realizing the intelligent control of sewage treatment.

[0052] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An intelligent control system for sewage treatment, characterized in that: Including a first circuit breaker, a second circuit breaker, a third circuit breaker, a fourth circuit breaker, a fifth circuit breaker, a soft starter, a first contactor, a second contactor, a third contactor, a fourth contactor, a fifth contactor, a sixth contactor, a seventh contactor, an eighth contactor, a first motor, a second motor, a third motor, a fourth motor, a PLC controller, a liquid crystal display, a liquid level transmitter, a temperature controller, a fan, a switch, and a host computer; One end of the first circuit breaker, the second circuit breaker, the third circuit breaker, the fourth circuit breaker, and the fifth circuit breaker is connected to a three-phase power supply. The other end of the first circuit breaker is connected to the soft starter. One end of the soft starter is respectively connected to one end of the first contactor, the third contactor, and the fifth contactor. The other ends of the first contactor, the third contactor, and the fifth contactor are respectively connected to the first motor, the second motor, and the third motor. The other ends of the second circuit breaker, the third circuit breaker, and the fourth circuit breaker are respectively connected to one end of the second contactor, the fourth contactor, and the sixth contactor. The other ends of the second contactor, the fourth contactor, and the sixth contactor are respectively connected to the first motor, the second motor, and the third motor. The other end of the fifth circuit breaker is respectively connected to one end of the seventh contactor and the eighth contactor. The other ends of the seventh contactor and the eighth contactor are both connected to the fourth motor; The first contactor, the third contactor, and the fifth contactor are respectively used for the soft start control of the first motor, the second motor, and the third motor. After the soft start of the first motor, the second motor, and the third motor, the corresponding second contactor, fourth contactor, and sixth contactor are turned on, the motors operate normally, and the soft starter exits the soft start; The switch is connected to the PLC controller. The PLC controller communicates with the host computer through the switch, either wired or wirelessly. The liquid crystal display is connected to the PLC controller and is used for displaying the working status. The temperature controller is connected to the PLC controller. The PLC controller starts the fan through the temperature controller. The liquid level transmitter is connected to the PLC controller. The PLC controller is connected to the soft starter. The PLC controller controls the soft starter to start the corresponding motor according to the liquid level height; The control circuit of the intelligent control system includes a sixth circuit breaker QF101, a first intermediate relay KA1, a second intermediate relay KA2, a third intermediate relay KA3, a fourth intermediate relay KA4, a fifth intermediate relay KA5, a sixth intermediate relay KA6, a seventh intermediate relay KA7, an eighth intermediate relay KA8, a first changeover switch SA1, a second changeover switch SA2, a third changeover switch SA3, a first push button SB1, a second push button SB2, a third push button SB3, a fourth push button SB4, a fifth push button SB5, a sixth push button SB6, a first contactor KM1, a second contactor KM2, a third contactor KM3, a fourth contactor KM4, a fifth contactor KM5, a sixth contactor KM6, a first motor stop indicator HR1, a second motor stop indicator HR2, and a third motor stop indicator HR3; One end of the sixth circuit breaker QF101 is connected to a phase power supply line, and the other end terminals of the sixth circuit breaker QF101 are 101 and are respectively connected to one end of the normally closed contact KM1-1 of the first contactor, one end of the normally closed contact KM3-2 of the third contactor, one end of the normally closed contact KM5-3 of the fifth contactor, one end of the normally open contact of the third intermediate relay KA3, one end of the normally open contact of the fourth intermediate relay KA4, and one end of the normally open contact of the fifth intermediate relay KA5; Terminals 1 and 2 of the soft starter RQ are normally open contacts of the bypass relay. Terminal 1 of the soft starter RQ is connected to the other end of the sixth circuit breaker QF101. Terminal 2 of the soft starter RQ is connected to one end of the coil of the first intermediate relay KA1, and the other end of the coil of the first intermediate relay KA1 is connected to the neutral line; One end of the normally open contact KM2-5 of the second contactor, one end of the normally open contact KM4-5 of the fourth contactor, and one end of the normally open contact KM6-5 of the sixth contactor are respectively connected to the other end of the sixth circuit breaker QF101. The other ends of the normally open contact KM2-5 of the second contactor, the other end of the normally open contact KM4-5 of the fourth contactor, and the other end of the normally open contact KM6-5 of the sixth contactor are respectively connected to one end of the coil of the fan relay FS, and the other end of the coil of the fan relay FS is connected to the neutral line; Pin 2 of the first changeover switch SA1 is connected to one end of the normally open contact of the sixth intermediate relay KA6. The other end of KA6 is connected to one end of KM2-4, and the other end of KM2-4 is connected to KM2; Pin 2 of the second changeover switch SA2 is connected to one end of the normally open contact of the seventh intermediate relay KA7. The other end of KA7 is connected to one end of KM4-4, and the other end of KM4-4 is connected to KM4; Pin 2 of the third changeover switch SA3 is connected to one end of the normally open contact of the eighth intermediate relay KA8. The other end of KA8 is connected to one end of KM6-4, and the other end of KM6-4 is connected to KM6.

2. The intelligent control system for sewage treatment according to claim 1, characterized in that, The intelligent control system includes a main circuit. The main circuit includes three-phase power supply lines L1, L2, L3, the first circuit breaker QF1, the second circuit breaker QF2, the third circuit breaker QF3, the fourth circuit breaker QF4, the fifth circuit breaker QF5, the soft starter RQ, the first contactor KM1, the second contactor KM2, the third contactor KM3, the fourth contactor KM4, the fifth contactor KM5, the sixth contactor KM6, the seventh contactor KM7, the eighth contactor KM8, the first motor M1, the second motor M2, the third motor M3, and the fourth motor M4; The three-phase power lines L1, L2, and L3 are respectively connected to the input ends of the first circuit breaker QF1, the second circuit breaker QF2, the third circuit breaker QF3, the fourth circuit breaker QF4, and the fifth circuit breaker QF5. The output end of the first circuit breaker QF1 is connected to the three input ends of the soft starter RQR, S, and T. The three output ends U, V, and W of the soft starter are respectively connected to the input ends of the first contactor KM1, the third contactor KM3, and the fifth contactor KM5. The output ends of the first contactor KM1, the third contactor KM3, and the fifth contactor KM5 are respectively connected to the first motor M1, the second motor M2, and the third motor M3. The output ends of the second circuit breaker QF2, the third circuit breaker QF3, and the fourth circuit breaker QF4 are respectively connected to the input ends of the second contactor KM2, the fourth contactor KM4, and the sixth contactor KM6. The output ends of the second contactor KM2, the fourth contactor KM4, and the sixth contactor KM6 are respectively connected to the first motor M1, the second motor M2, and the third motor M3. The output end of the fifth circuit breaker QF5 is respectively connected to the input ends of the seventh contactor KM7 and the eighth contactor KM8. The output ends of the seventh contactor KM7 and the eighth contactor KM8 are both connected to the fourth motor M4.

3. The intelligent control system for sewage treatment according to claim 1, characterized in that, The control circuit of the intelligent control system further includes: The other end of the normally closed contact KM1-1 of the first contactor is connected to one end of the normally closed contact KM2-1 of the second contactor. The other end of the normally closed contact KM2-1 of the second contactor is connected to one end of the stop indicator HR1 of the first motor. The other end of the stop indicator HR1 of the first motor is connected to the neutral line. The other end of the normally closed contact KM3-2 of the third contactor is connected to one end of the normally closed contact KM4-1 of the fourth contactor. The other end of the normally closed contact KM4-1 of the fourth contactor is connected to one end of the stop indicator HR2 of the second motor. The other end of the stop indicator HR2 of the second motor is connected to the neutral line. The other end of the normally closed contact KM5-3 of the fifth contactor is connected to one end of the normally closed contact KM6-1 of the sixth contactor. The other end of the normally closed contact KM6-1 of the sixth contactor is connected to one end of the stop indicator HR3 of the third motor. The other end of the stop indicator HR3 of the third motor is connected to the neutral line. The other end of the normally open contact of the third intermediate relay KA3 is connected to the 3rd pin of the first changeover switch SA1. The 4th pin of the first changeover switch SA1 is connected to one end of the first push button SB1. The other end of the first push button SB1 is connected to one end of the second push button SB2, one end of the normally open contact KM1-2 of the first contactor, and one end of the normally open contact KM2-3 of the second contactor. The other end of the second push button SB2 is connected to the other end of the normally open contact KM1-2 of the first contactor. The other end of the normally open contact KM2-3 of the second contactor is connected to one end of the coil of the second contactor KM2. The other end of the coil of the second contactor KM2 is connected to the neutral line. There is a normally open contact KA1-1 of the first intermediate relay connected to the other end of the normally open contact KM1-2 of the first contactor and the other end of the normally open contact KM2-3 of the second contactor. There is a normally open contact KM2-4 of the second contactor connected in parallel across both ends of the normally open contact KA1-1 of the first intermediate relay; The other end of the normally open contact of the sixth intermediate relay KA6 is connected to the other end of the second push button SB2 and one end of the normally closed contact KM2-2 of the second contactor. The other end of the normally closed contact KM2-2 of the second contactor is connected to one end of the normally closed contact KM3-1 of the third contactor. The other end of the normally closed contact KM3-1 of the third contactor is connected to one end of the normally closed contact KM5-1 of the fifth contactor. The other end of the normally closed contact KM5-1 of the fifth contactor is connected to one end of the coil of the first contactor KM1. The other end of the coil of the first contactor KM1 is connected to the neutral line; The other end of the normally open contact of the fourth intermediate relay KA4 is connected to the 3rd pin of the second changeover switch SA2. The 4th pin of the second changeover switch SA2 is connected to one end of the third push button SB3. The other end of the third push button SB3 is connected to one end of the fourth push button SB4, one end of the normally open contact KM3-3 of the third contactor, and one end of the normally open contact KM4-3 of the fourth contactor. The other end of the fourth push button SB4 is connected to the other end of the normally open contact KM3-3 of the third contactor. The other end of the normally open contact KM4-3 of the fourth contactor is connected to one end of the coil of the fourth contactor KM4. The other end of the coil of the fourth contactor KM4 is connected to the neutral line. There is a normally open contact KA1-2 of the first intermediate relay connected to the other end of the normally open contact KM3-3 of the third contactor and the other end of the normally open contact KM4-3 of the fourth contactor. There is a normally open contact KM4-4 of the fourth contactor connected in parallel across both ends of the normally open contact KA1-2 of the first intermediate relay; The other end of the normally open contact of the seventh intermediate relay KA7 is connected to the other end of the fourth push button SB4 and one end of the normally closed contact KM4-2 of the fourth contactor. The other end of the normally closed contact KM4-2 of the fourth contactor is connected to one end of the normally closed contact KM1-3 of the first contactor. The other end of the normally closed contact KM1-3 of the first contactor is connected to one end of the normally closed contact KM5-2 of the fifth contactor. The other end of the normally closed contact KM5-2 of the fifth contactor is connected to one end of the coil of the third contactor KM3. The other end of the coil of the third contactor KM3 is connected to the neutral line; The other end of the normally open contact of the fifth intermediate relay KA5 is connected to the 3rd pin of the third changeover switch SA3. The 4th pin of the third changeover switch SA3 is connected to one end of the fifth push button SB5. The other end of the fifth push button SB5 is connected to one end of the sixth push button SB6, one end of the normally open contact KM5-4 of the fifth contactor, and one end of the normally open contact KM6-3 of the sixth contactor. The other end of the sixth push button SB6 is connected to the other end of the normally open contact KM5-4 of the fifth contactor. The other end of the normally open contact KM6-3 of the sixth contactor is connected to one end of the coil of the sixth contactor KM6. The other end of the coil of the sixth contactor KM6 is connected to the neutral line. There is a normally open contact KA1-3 of the first intermediate relay connected to the other end of the normally open contact KM5-4 of the fifth contactor and the other end of the normally open contact KM6-3 of the sixth contactor. There is a normally open contact KM6-4 of the sixth contactor connected in parallel across both ends of the normally open contact KA1-3 of the first intermediate relay. The other end of the normally open contact of the eighth intermediate relay KA8 is connected to the other end of the sixth push button SB6 and one end of the normally closed contact KM6-2 of the sixth contactor. The other end of the normally closed contact KM6-2 of the sixth contactor is connected to one end of the normally closed contact KM1-4 of the first contactor. The other end of the normally closed contact KM1-4 of the first contactor is connected to one end of the normally closed contact KM3-4 of the third contactor. The other end of the normally closed contact KM3-4 of the third contactor is connected to one end of the coil of the fifth contactor KM5. The other end of the coil of the fifth contactor KM5 is connected to the neutral line.

4. The intelligent control system for sewage treatment according to claim 3, characterized in that, The control circuit further includes a first motor fault relay FM1, a second motor fault relay FM2, a third motor fault relay FM3, a first motor fault indicator light HY1, a second motor fault indicator light HY2, a third motor fault indicator light HY3, and a fan relay FS. One end of the normally closed contact of the first motor fault relay FM1, one end of the normally closed contact of the second motor fault relay FM2, and one end of the normally closed contact of the third motor fault relay FM3 are respectively connected to the other end of the sixth circuit breaker QF101. One end of the normally closed contact of the first motor fault relay FM1 is connected to one end of the coil of the third intermediate relay KA3, and the other end of the coil of the third intermediate relay KA3 is connected to the neutral line. The other end of the normally closed contact of the second motor fault relay FM2 is connected to one end of the coil of the fourth intermediate relay KA4, and the other end of the coil of the fourth intermediate relay KA4 is connected to the neutral line. The other end of the normally closed contact of the third motor fault relay FM3 is connected to one end of the coil of the fifth intermediate relay KA5, and the other end of the coil of the fifth intermediate relay KA5 is connected to the neutral line. One end of the normally closed contact of the third intermediate relay KA3, one end of the normally closed contact of the fourth intermediate relay KA4, and one end of the normally closed contact of the fifth intermediate relay KA5 are respectively connected to the other end of the sixth circuit breaker QF101. The other end of the normally closed contact of the third intermediate relay KA3 is connected to one end of the first motor fault indicator light HY1, and the other end of the first motor fault indicator light HY1 is connected to the neutral line. The other end of the normally closed contact of the fourth intermediate relay KA4 is connected to one end of the second motor fault indicator light HY2, and the other end of the second motor fault indicator light HY2 is connected to the neutral line. The other end of the normally closed contact of the fifth intermediate relay KA5 is connected to one end of the third motor fault indicator light HY3, and the other end of the third motor fault indicator light HY3 is connected to the neutral line. One end of the normally open contact of the first contactor KM1-5, one end of the normally open contact of the third contactor KM3-5, and one end of the normally open contact of the fifth contactor KM5-5 are respectively connected to the other end of the sixth circuit breaker QF101. The other end of the normally open contact of the first contactor KM1-5, the other end of the normally open contact of the third contactor KM3-5, and the other end of the normally open contact of the fifth contactor KM5-5 are respectively connected to one end of the coil of the second intermediate relay KA2, and the other end of the coil of the second intermediate relay KA2 is connected to the neutral line.

5. The intelligent control system for sewage treatment according to claim 3, characterized in that, The control circuit includes a forward and reverse control circuit for the fourth motor M4. The forward and reverse control circuit includes the ninth intermediate relay KA9, the tenth intermediate relay KA10, the eleventh intermediate relay KA11, the fourth change-over switch SA4, the seventh push button SB7, the eighth push button SB8, the ninth push button SB9, the seventh contactor KM7, the eighth contactor KM8, the forward rotation indicator HR4 of the fourth motor, the reverse rotation indicator HR5 of the fourth motor, and the stop indicator HR6 of the fourth motor; One end of the normally closed contact of the ninth intermediate relay KA9 is connected to the other end of the sixth circuit breaker QF101, and the other end of the normally closed contact of the ninth intermediate relay KA9 is connected to the 3rd pin of the fourth change-over switch SA4. The 4th pin of the fourth change-over switch SA4 is connected to one end of the seventh push button SB7, and the other end of the seventh push button SB7 is respectively connected to one end of the eighth push button SB8 and one end of the ninth push button SB9. The 2nd pin of the fourth change-over switch SA4 is connected to one end of the normally open contact of the tenth intermediate relay KA10 and one end of the normally open contact of the eleventh intermediate relay KA11. The other end of the normally open contact of the tenth intermediate relay KA10 is respectively connected to the other end of the eighth push button SB8 and one end of the normally closed contact KM8-1 of the eighth contactor. The other end of the normally closed contact KM8-1 of the eighth contactor is respectively connected to one end of the coil of the seventh contactor KM7 and one end of the forward rotation indicator HR4 of the fourth motor. The other end of the coil of the seventh contactor KM7 and the other end of the forward rotation indicator HR4 of the fourth motor are connected to the neutral line. The other end of the normally open contact of the eleventh intermediate relay KA11 is respectively connected to the other end of the ninth push button B9S and one end of the normally closed contact KM7-2 of the seventh contactor. The other end of the normally closed contact KM7-2 of the seventh contactor is respectively connected to one end of the coil of the eighth contactor KM8 and one end of the reverse rotation indicator HR5 of the fourth motor. The other end of the coil of the eighth contactor KM8 and the other end of the reverse rotation indicator HR5 of the fourth motor are connected to the neutral line. The normally open contact KM7-1 of the seventh contactor is connected in parallel across the two ends of the eighth push button SB8, and the normally open contact KM8-2 of the eighth contactor is connected in parallel across the two ends of the ninth push button SB9; One end of the normally closed contact KM7-3 of the seventh contactor is connected to the other end of the sixth circuit breaker QF101, and the other end of the normally closed contact KM7-3 of the seventh contactor is connected to one end of the normally closed contact KM8-3 of the eighth contactor. The other end of the normally closed contact KM8-3 of the eighth contactor is connected to one end of the stop indicator HR6 of the fourth motor, and the other end of the stop indicator HR6 of the fourth motor is connected to the neutral line.

6. The intelligent control system for sewage treatment according to claim 2, characterized in that, The soft starter RQ is the Delixi soft starter CDRA015T4.

7. The intelligent control system for sewage treatment according to claim 1, characterized in that, The PLC controller is the Siemens S7-1500.

8. The intelligent control system for sewage treatment according to claim 1, characterized in that, The liquid crystal display screen is the Siemens 6AV6.

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