An anti-derailment control circuit for a sewage plant scraping and sucking sediment machine and its control method

Abstract

The invention discloses a derailment prevention control circuit for a sewage plant scraping and sucking sediment machine, belonging to the technical field of electrical protection design for derailment prevention of overhead traveling equipment in the sewage treatment industry, including a power supply port. The invention also discloses a control method for the derailment prevention control circuit of a sewage plant scraping and sucking sediment machine. The invention provides multiple relay protections such as one-way operation timeout, overload, slide rail, derailment, open phase, three-phase imbalance, and unilateral overload for the overhead traveling scraping and sucking sediment equipment. An adjustable high-precision motor protection controller is installed in the main circuit of the driving motor of the overhead traveling equipment. When the driving current is greater than the set threshold, the equipment parking protection is started. In the main control circuit of the invention, an emergency stop button is set. When the power is lost and disconnected, both manual and automatic operations are stopped, and it can be restarted only after pressing the button to reset.

Description

Technical Field

[0001] The present invention belongs to the technical field of the anti-derailment electrical protection design of traveling equipment in the sewage treatment industry, and particularly relates to an anti-derailment control circuit and a control method for a sludge suction and sand scraping machine in a sewage treatment plant. Background Art

[0002] In the production processes of various sewage treatment plants in our country, sludge (sand) suction and scraping equipment is widely used during traveling. The operation mode of this type of equipment is unattended automatic operation. Equipment failures, installation and maintenance errors, and track frosting can all cause derailment accidents of this type of equipment. Also, because this type of equipment is in an unattended automatic operation mode, faults are often not discovered and shut down in a timely manner at the initial stage of the fault, which then leads to the expansion of the fault and the expansion of equipment losses. Its electrical control design needs to be improved. Summary of the Invention

[0003] To solve the problems raised in the above background art, the present invention provides an anti-derailment control circuit for a sludge suction and sand scraping machine in a sewage treatment plant, which has the characteristics of effectively preventing derailment and effectively protecting the equipment.

[0004] Another object of the present invention is to provide a control method for an anti-derailment control circuit of a sludge suction and sand scraping machine in a sewage treatment plant.

[0005] To achieve the above object, the present invention provides the following technical solution: An anti-derailment control circuit for a sludge suction and sand scraping machine in a sewage treatment plant includes a power supply port, and the power supply port is respectively connected in parallel and electrically to a manual forward and reverse control circuit, a proximity sensor connection circuit, an overtime protection circuit, a main control circuit, a PLC remote automatic control circuit, and a manual-automatic conversion connection circuit. The power supply port is electrically connected to a motor protection circuit, and the motor protection circuit is electrically connected to a drive motor circuit. The manual forward and reverse control circuit, the proximity sensor connection circuit, the overtime protection circuit, the main control circuit, the PLC remote automatic control circuit, and the manual-automatic conversion connection circuit are all electrically connected to the input end of the drive motor circuit.

[0006] Preferably, the drive motor circuit includes drive motors M1 and M2. Thermal relays FR are connected to the connection terminals of drive motors M1 and M2. The input ends of thermal relays FR are connected in parallel with contactors KM1 and KM2. The input ends of contactors KM1 and KM2 are connected to a fuse FU1. The input end of fuse FU1 is connected to a knife switch QS, and the knife switch QS is connected to pins 1, 2, and 3 of the power supply port P.

[0007] Preferably, the manual forward and reverse control circuit includes a forward button SB1 and a reverse button SB2. The fuse FU1 terminal of the 1st pin of the power supply port P is connected to a fuse FU2. The fuse FU2 is respectively connected to two groups of intermediate relays KA4 in parallel. Both groups of intermediate relays KA4 are connected to an intermediate relay KA1. The intermediate relay KA1 is connected to a button SB3. One group of button SB3 is connected to the forward button SB1, and the other group of button SB3 is connected to the reverse button SB2. The forward button SB1 is connected to a contactor KM1. The contactor KM1 of the forward button SB1 is connected to a contactor KM2. The reverse button SB2 is connected to the contactor KM2. The contactor KM2 of the reverse button SB2 is connected to the contactor KM1. The contactor KM2 and the contactor KM1 are connected in parallel to the 4th pin of the power supply port P. There are an intermediate relay KA1 and an intermediate relay KA2 connected in series between the intermediate relay KA4 and the contactor KM1. There are an intermediate relay KA1 and an intermediate relay KA3 connected in series between the intermediate relay KA4 and the contactor KM2. A contactor KM1 is connected in parallel between the button SB3 and the output terminal of the forward button SB1. A contactor KM2 is connected in parallel between the button SB3 and the output terminal of the reverse button SB2.

[0008] Preferably, the proximity sensor connection circuit includes a proximity sensor SQ1 and a proximity sensor SQ2. The fuse FU2 is respectively connected to the proximity sensor SQ1 and the proximity sensor SQ2 in parallel. The proximity sensor SQ1 is connected to an intermediate relay KA5. The proximity sensor SQ2 is connected to an intermediate relay KA6. The intermediate relay KA5 and the intermediate relay KA6 are connected in parallel to the 4th pin of the power supply port P.

[0009] Preferably, the motor protection circuit includes a motor protector FM1 and a motor protector FM2. The fuse FU2 is respectively connected to the motor protector FM1 and the motor protector FM2 in parallel. One end of both the motor protector FM1 and the motor protector FM2 is connected in parallel to the 4th pin of the power supply port P. The motor protector FM1 is connected to a drive motor M1. The motor protector FM2 is connected to a drive motor M2.

[0010] Preferably, the timeout protection circuit includes a time-delay relay KT. The 4th pin of the power supply port P is connected to the time-delay relay KT. The time-delay relay KT is connected in parallel to a contactor KM1 and a contactor KM2. Both the contactor KM1 and the contactor KM2 are connected to the fuse FU2.

[0011] Preferably, the main control circuit includes an emergency stop button SBE, which is connected to a fuse FU2, the emergency stop button SBE is connected to an intermediate relay KA6, the intermediate relay KA6 is connected to an intermediate relay KA5, the intermediate relay KA5 is connected to a protector F1, the protector F1 is connected to a protector F2, the protector F2 is connected to a thermal relay FR, the thermal relay FR is connected to a time-delay relay KT, the time-delay relay KT is connected in parallel with an intermediate relay KA4 and a button SB4, both the intermediate relay KA4 and the button SB4 are connected to another group of intermediate relay KA4, and the intermediate relay KA4 is connected to the 4th pin of the power supply port P.

[0012] Preferably, the PLC remote automatic control circuit includes a programmable logic controller PLC, the programmable logic controller PLC is connected to a fuse FU2, the forward control end of the programmable logic controller PLC is connected to an intermediate relay KA2, the reverse control end of the programmable logic controller PLC is connected to an intermediate relay KA3, and the intermediate relay KA2 and the intermediate relay KA3 are connected in parallel to the 4th pin of the power supply port P.

[0013] Preferably, the manual-automatic conversion switching-on circuit includes a changeover switch SA, the changeover switch SA is connected to a fuse FU2, the changeover switch SA is connected to an intermediate relay KA1, and the intermediate relay KA1 is connected to the 4th pin of the power supply port P.

[0014] Preferably, the control method of the anti-derailment control circuit of the traveling scraping and sucking sediment machine in the horizontal secondary sedimentation tank of the sewage treatment plant is as follows:

[0015] ① The time-delay relay KT is powered by the control power supply. When the contactor KM1 or the contactor KM2 is switched on, the equipment operation timing starts. When the time limit reaches, the time-delay relay KT acts, the intermediate relay KA4 in the main control circuit loses power, and the equipment is stopped.

[0016] ② The motor protector FM is powered by the control power supply, and the signal is collected from the induction coil under the main contactor of the equipment drive motor. When situations such as the drive motor M being blocked, overloaded, single-phased, leaking electricity, heat accumulating, or unilaterally jammed occur, the protection reports a fault, the intermediate relay KA4 in the protection loses power, and the equipment is stopped.

[0017] ③ The proximity sensor SQ is installed on the extension line of the unilateral vehicle traveling wheel, as close as possible to the outer edge of the equipment structure to obtain the maximum deflection angle amplification factor. The sensing part of the sensor is close to the track surface, and the two sensors need to be close to the same side of the track to obtain two-way deviation protection.

[0018] When any kind of protection action occurs, the equipment cannot be started before the button SB4 is pressed to reset. After rectification, repair or confirmation is correct, pressing the button SB4 to reset allows the equipment to start and run normally.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. The present invention provides multiple relay protections for the traveling scraping and suction sludge equipment, such as one-way operation overtime, overload, slide rail, derailment, open phase, three-phase imbalance, and unilateral overload. An adjustable high-precision motor protection controller is installed in the main circuit of the traveling driving motor. When the driving current is greater than the set threshold, the equipment stops for protection.

[0021] 2. The present invention sets an emergency stop button in the main control circuit. When power is lost and disconnected, both manual and automatic operations are stopped, and it can only be restarted after pressing the button to reset.

[0022] 3. The present invention is provided with an overtime protection relay. When the equipment starts and runs forward or backward, the timing starts. When the cumulative timing reaches the set time limit, the time relay acts to avoid the driving motor working under load and extend the service life of the motor.

[0023] 4. The present invention is provided with a motor protector, which can provide multiple motor protections such as overload, open phase, imbalance, and heat accumulation. When it acts, KA4 loses power and disconnects; one is installed for each driving motor, and the wires are staggered for unilateral jamming protection. When unilateral jamming occurs, the driving currents on both sides are bound to be unequal, and the protector acts due to imbalance.

[0024] 5. The present invention is provided with proximity sensors. Through distance sensing, when the sensors are separated from the track, the intermediate relay loses power and disconnects, cutting off the power supply to the driving motor to achieve the purpose of parking protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of the present invention;

[0026] Figure 2 is a schematic structural diagram of the driving motor circuit of the present invention;

[0027] Figure 3 is a schematic structural diagram of the manual forward and reverse control circuit of the present invention;

[0028] Figure 4 is a schematic structural diagram of the proximity sensor connection circuit of the present invention;

[0029] Figure 5 is a schematic structural diagram of the motor protection circuit of the present invention;

[0030] Figure 6 is a schematic structural diagram of the overtime protection circuit of the present invention;

[0031] Figure 7 is a schematic structural diagram of the main control circuit of the present invention;

[0032] Figure 8It is a schematic structural diagram of the PLC remote automatic control circuit of the present invention;

[0033] Figure 9 It is a schematic structural diagram of the manual-automatic conversion and connection circuit of the present invention;

[0034] Figure 10 It is a schematic structural diagram of the overall connection circuit of the present invention;

[0035] In the figure: 1. Power supply port; 2. Driving motor circuit; 3. Manual forward and reverse control circuit; 4. Proximity sensor connection circuit; 5. Motor protection circuit; 6. Over-time protection circuit; 7. Main control circuit; 8. PLC remote automatic control circuit; 9. Manual-automatic conversion and connection circuit. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] Please refer to Figure 1-10 , the present invention provides the following technical solutions: A derailment prevention control circuit for a sludge scraping and sucking machine in a sewage treatment plant, including a power supply port 1, and the power supply port 1 is respectively connected in parallel and electrically connected to a manual forward and reverse control circuit 3, a proximity sensor connection circuit 4, an over-time protection circuit 6, a main control circuit 7, a PLC remote automatic control circuit 8, and a manual-automatic conversion and connection circuit 9. The power supply port 1 is electrically connected to a motor protection circuit 5, and the motor protection circuit 5 is electrically connected to a driving motor circuit 2. The manual forward and reverse control circuit 3, the proximity sensor connection circuit 4, the over-time protection circuit 6, the main control circuit 7, the PLC remote automatic control circuit 8, and the manual-automatic conversion and connection circuit 9 are all electrically connected to the input end of the driving motor circuit 2.

[0038] Specifically, the driving motor circuit 2 includes a driving motor M1 and a driving motor M2. The connection terminals of the driving motor M1 and the driving motor M2 are both connected with a thermal relay FR. The input end of the thermal relay FR is connected with a parallel connection of a contactor KM1 and a contactor KM2. The input ends of the contactor KM1 and the contactor KM2 are connected to a fuse FU1. The input end of the fuse FU1 is connected to a knife switch QS, and the knife switch QS is connected to the 1st, 2nd, and 3rd pins of the power supply port P.

[0039] By adopting the above technical solution, the driving motor is controlled and connected to power supply, which is convenient for operation.

[0040] Specifically, the manual forward and reverse control circuit 3 includes a forward button SB1 and a reverse button SB2. The fuse FU1 terminal of the 1st pin of the power supply port P is connected with a fuse FU2. The fuse FU2 is respectively connected with two groups of intermediate relays KA4 in parallel. Both groups of intermediate relays KA4 are connected to the intermediate relay KA1. The intermediate relay KA1 is connected to the button SB3. One group of button SB3 is connected to the forward button SB1, and the other group of button SB3 is connected to the reverse button SB2. The forward button SB1 is connected to the contactor KM1. The contactor KM1 of the forward button SB1 is connected to the contactor KM2. The reverse button SB2 is connected to the contactor KM2. The contactor KM2 of the reverse button SB2 is connected to the contactor KM1. The contactors KM2 and KM1 are connected in parallel to the 4th pin of the power supply port P. A series connection of the intermediate relay KA1 and the intermediate relay KA2 is arranged between the intermediate relay KA4 and the contactor KM1. A series connection of the intermediate relay KA1 and the intermediate relay KA3 is arranged between the intermediate relay KA4 and the contactor KM2. The contactor KM1 is connected in parallel between the button SB3 and the output terminal of the forward button SB1. The contactor KM2 is connected in parallel between the button SB3 and the output terminal of the reverse button SB2.

[0041] By adopting the above technical solution, manual forward and reverse start control is performed.

[0042] Specifically, the proximity sensor connection circuit 4 includes a proximity sensor SQ1 and a proximity sensor SQ2. The fuse FU2 is respectively connected with the proximity sensor SQ1 and the proximity sensor SQ2 in parallel. The proximity sensor SQ1 is connected to the intermediate relay KA5. The proximity sensor SQ2 is connected to the intermediate relay KA6. The intermediate relays KA5 and KA6 are connected in parallel to the 4th pin of the power supply port P.

[0043] By adopting the above technical solution, when approaching derailment through distance sensing, the driving motor is powered off.

[0044] Specifically, the motor protection circuit 5 includes a motor protector FM1 and a motor protector FM2. The fuse FU2 is respectively connected with the motor protector FM1 and the motor protector FM2 in parallel. One end of both the motor protector FM1 and the motor protector FM2 is connected in parallel to the 4th pin of the power supply port P. The motor protector FM1 is connected to the driving motor M1. The motor protector FM2 is connected to the driving motor M2.

[0045] By adopting the above technical solution, the motor protector FM provides multiple motor protections such as overload, phase loss, imbalance, and heat accumulation, improving the service life of the motor.

[0046] Specifically, the overtime protection circuit 6 includes a time-delay relay KT. The 4th pin of the power supply port P is connected to the time-delay relay KT. The time-delay relay KT is connected in parallel with a contactor KM1 and a contactor KM2. Both the contactor KM1 and the contactor KM2 are connected to a fuse FU2.

[0047] By adopting the above technical solution, the load operation of the drive motor is avoided, providing protection for the motor.

[0048] Specifically, the main control circuit 7 includes an emergency stop button SBE. The emergency stop button SBE is connected to the fuse FU2. The emergency stop button SBE is connected to an intermediate relay KA6. The intermediate relay KA6 is connected to an intermediate relay KA5. The intermediate relay KA5 is connected to a protector F1. The protector F1 is connected to a protector F2. The protector F2 is connected to a thermal relay FR. The thermal relay FR is connected to the time-delay relay KT. The time-delay relay KT is connected in parallel with an intermediate relay KA4 and a button SB4. Both the intermediate relay KA4 and the button SB4 are connected to another group of intermediate relay KA4. The intermediate relay KA4 is connected to the 4th pin of the power supply port P.

[0049] By adopting the above technical solution, when power is lost and disconnected, the button SB4 is reset, facilitating the restart of the drive motor.

[0050] Specifically, the PLC remote automatic control circuit 8 includes a programmable logic controller PLC. The programmable logic controller PLC is connected to the fuse FU2. The forward control end of the programmable logic controller PLC is connected to an intermediate relay KA2. The reverse control end of the programmable logic controller PLC is connected to an intermediate relay KA3. The intermediate relay KA2 and the intermediate relay KA3 are connected in parallel to the 4th pin of the power supply port P.

[0051] By adopting the above technical solution, it is convenient to remotely and automatically control the forward and reverse directions.

[0052] Specifically, the manual-automatic conversion connection circuit 9 includes a changeover switch SA. The changeover switch SA is connected to the fuse FU2. The changeover switch SA is connected to an intermediate relay KA1. The intermediate relay KA1 is connected to the 4th pin of the power supply port P.

[0053] By adopting the above technical solution, it is convenient to switch between automatic and manual modes, facilitating the control operation of the control personnel.

[0054] Specifically, the control method of the anti-derailment control circuit of the traveling scraping and sucking sediment machine in the horizontal secondary sedimentation tank of the sewage treatment plant is as follows:

[0055] ① The delay relay KT is powered by the control power supply. When the contactor KM1 or the contactor KM2 is turned on, the equipment operation timing starts. When the time limit reaches, the delay relay KT operates, the intermediate relay KA4 in the main control circuit loses power, and the equipment is stopped.

[0056] ② The motor protector FM is powered by the control power supply, and the signal is collected from the induction coil under the main contactor of the equipment drive motor. When the drive motor M has situations such as blocked rotation, overload, open phase, leakage, heat accumulation, or unilateral jamming, the protection reports a fault, the intermediate relay KA4 in the protection loses power, and the equipment is stopped.

[0057] ③ The proximity sensor SQ is installed on the extension line of the unilateral vehicle walking wheel, as close as possible to the outer edge of the equipment structure to obtain the maximum deflection angle amplification factor. The sensing part of the sensor is close to the track surface, and the two sensors need to be close to the same side of the track to obtain two-way deviation protection.

[0058] When any kind of protection action occurs, the equipment cannot be started before the button SB4 is pressed for reset. After correction, repair or confirmation, pressing the button SB4 to reset, the equipment can start and run normally.

[0059] The working principle and usage process of the present invention: When the present invention is used,

[0060] The delay relay KT is powered by the control power supply. When the contactor KM1 or the contactor KM2 is turned on, the equipment operation timing starts. When the time limit reaches, the delay relay KT operates, the intermediate relay KA4 in the main control circuit loses power, and the equipment is stopped.

[0061] The motor protector FM is powered by the control power supply, and the signal is collected from the induction coil under the main contactor of the equipment drive motor. When the drive motor M has situations such as blocked rotation, overload, open phase, leakage, heat accumulation, or unilateral jamming, the protection reports a fault, the intermediate relay KA4 in the protection loses power, and the equipment is stopped.

[0062] The proximity sensor SQ is installed on the extension line of the unilateral vehicle walking wheel, as close as possible to the outer edge of the equipment structure to obtain the maximum deflection angle amplification factor. The sensing part of the sensor is close to the track surface, and the two sensors need to be close to the same side of the track to obtain two-way deviation protection.

[0063] When any kind of protection action occurs, the equipment cannot be started before the button SB4 is pressed for reset. After correction, repair or confirmation, pressing the button SB4 to reset, the equipment can start and run normally.

[0064] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A derailment prevention control circuit for a sewage plant scraping and sucking sediment machine, including a power supply port (1), Characterized in that: The power supply port (1) is respectively connected in parallel and electrically connected to a manual forward and reverse control circuit (3), a proximity sensor connection circuit (4), a timeout protection circuit (6), a main control circuit (7), a PLC remote automatic control circuit (8) and a manual-automatic conversion connection circuit (9). The power supply port (1) is electrically connected to a motor protection circuit (5), and the motor protection circuit (5) is electrically connected to a drive motor circuit (2). The manual forward and reverse control circuit (3), the proximity sensor connection circuit (4), the timeout protection circuit (6), the main control circuit (7), the PLC remote automatic control circuit (8) and the manual-automatic conversion connection circuit (9) are all electrically connected to the input end of the drive motor circuit (2); The drive motor circuit (2) includes a drive motor M1 and a drive motor M2. The connection terminals of the drive motor M1 and the drive motor M2 are both connected with a thermal relay FR. The input end of the thermal relay FR is connected with a contactor KM1 and a contactor KM2 connected in parallel. The input ends of the contactor KM1 and the contactor KM2 are connected to a fuse FU1. The input end of the fuse FU1 is connected to a knife switch QS. The knife switch QS is connected to the 1st, 2nd and 3rd pins of the power supply port P; The manual forward and reverse control circuit (3) includes a forward button SB1 and a reverse button SB2. The fuse FU1 end of the 1st pin of the power supply port P is connected with a fuse FU2. The fuse FU2 is respectively connected with two groups of intermediate relays KA4 connected in parallel. Both groups of intermediate relays KA4 are connected to an intermediate relay KA1. The intermediate relay KA1 is connected to a button SB3. One group of button SB3 is connected to the forward button SB1, and the other group of button SB3 is connected to the reverse button SB2. The forward button SB1 is connected to the contactor KM1. The contactor KM1 of the forward button SB1 is connected to the contactor KM2. The reverse button SB2 is connected to the contactor KM2. The contactor KM2 of the reverse button SB2 is connected to the contactor KM1. The contactor KM2 and the contactor KM1 are connected in parallel to the 4th pin of the power supply port P. An intermediate relay KA1 and an intermediate relay KA2 are connected in series between the intermediate relay KA4 and the contactor KM1. An intermediate relay KA1 and an intermediate relay KA3 are connected in series between the intermediate relay KA4 and the contactor KM2. A contactor KM1 is connected in parallel between the button SB3 and the output end of the forward button SB1. A contactor KM2 is connected in parallel between the button SB3 and the output end of the reverse button SB2.

2. A derailment prevention control circuit for a sewage plant scraping and sucking sediment machine according to claim 1, Characterized in that: The proximity sensor connection circuit (4) includes proximity sensors SQ1 and SQ2. The fuse FU2 is respectively connected to the parallel-connected proximity sensors SQ1 and SQ2. The proximity sensor SQ1 is connected to the intermediate relay KA5, and the proximity sensor SQ2 is connected to the intermediate relay KA6. The intermediate relays KA5 and KA6 are connected in parallel to the 4th pin of the power supply port P.

3. The anti-derailment control circuit of a sewage plant scraping and sucking sediment machine according to claim 1, characterized in that: The motor protection circuit (5) includes motor protectors FM1 and FM2. The fuse FU2 is respectively connected to the parallel-connected motor protectors FM1 and FM2. One ends of the motor protectors FM1 and FM2 are both connected in parallel to the 4th pin of the power supply port P. The motor protector FM1 is connected to the drive motor M1, and the motor protector FM2 is connected to the drive motor M2.

4. The anti-derailment control circuit of a sewage plant scraping and sucking sediment machine according to claim 1, characterized in that: The timeout protection circuit (6) includes a time-delay relay KT. The 4th pin of the power supply port P is connected to the time-delay relay KT. The time-delay relay KT is connected in parallel with contactors KM1 and KM2. Both the contactors KM1 and KM2 are connected to the fuse FU2.

5. The anti-derailment control circuit of a sewage plant scraping and sucking sediment machine according to claim 1, characterized in that: The main control circuit (7) includes an emergency stop button SBE. The emergency stop button SBE is connected to the fuse FU2, the emergency stop button SBE is connected to the intermediate relay KA6, the intermediate relay KA6 is connected to the intermediate relay KA5, the intermediate relay KA5 is connected to the protector F1, the protector F1 is connected to the protector F2, the protector F2 is connected to the thermal relay FR, the thermal relay FR is connected to the time-delay relay KT, the time-delay relay KT is connected in parallel with an intermediate relay KA4 and a button SB4, the intermediate relay KA4 and the button SB4 are both connected to another group of intermediate relay KA4, and the intermediate relay KA4 is connected to the 4th pin of the power supply port P.

6. The anti-derailment control circuit of a sewage plant scraping and sucking sediment machine according to claim 1, characterized in that: The PLC remote automatic control circuit (8) includes a programmable logic controller PLC. The programmable logic controller PLC is connected to the fuse FU2. The forward control end of the programmable logic controller PLC is connected to the intermediate relay KA2, the reverse control end of the programmable logic controller PLC is connected to the intermediate relay KA3, and the intermediate relays KA2 and KA3 are connected in parallel to the 4th pin of the power supply port P.

7. The anti-derailment control circuit of a sewage plant scraping and sucking sediment machine according to claim 1, characterized in that: The manual-automatic conversion connection circuit (9) includes a changeover switch SA. The changeover switch SA is connected to the fuse FU2, the changeover switch SA is connected to the intermediate relay KA1, and the intermediate relay KA1 is connected to the 4th pin of the power supply port P.

8. A derailment prevention control circuit for a sewage plant scraping and sucking sediment machine according to any one of claims 1-7, characterized in that: The control method is as follows: ① The time-delay relay KT is powered by the control power supply. When the contactor KM1 or the contactor KM2 is turned on, the equipment operation timing starts. When the time limit reaches, the time-delay relay KT operates and the intermediate relay KA4 in the main control circuit loses power and the equipment is stopped; ② The motor protector FM is powered by the control power supply, and the signal is collected from the induction coil under the main contactor of the equipment drive motor. When situations such as the drive motor M being blocked, overloaded, single-phased, leaking electricity, heat accumulating, or unilaterally jammed occur, the protection reports a fault and the intermediate relay KA4 in the protection loses power and the equipment is stopped; ③ The proximity sensor SQ is installed on the extension line of the unilateral vehicle traveling wheel, as close as possible to the outer edge of the equipment structure, to obtain the maximum deflection angle amplification factor. The sensing part of the sensor is close to the track surface, and the two sensors need to be close to the same side of the track to obtain two-way deviation protection; When any kind of protection action occurs, the equipment cannot be started until the button SB4 is pressed to reset. After correction, repair or confirmation is correct, the equipment can be normally started and operated by pressing the button SB4 to reset.

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