Long-dragon dish-washing machine controlled by PLC (Programmable Logic Controller)

Abstract

The utility model provides a long dragon dish-washing machine controlled by a programmable logic controller (PLC), which belongs to the field of kitchen cleaning equipment and comprises a control system controlled by the PLC, and a pre-washing module, a main washing module, a spraying module and a drying module which are sequentially arranged along the conveying direction, the pre-washing module comprises a pre-washing pump M1, the main washing module comprises a main washing pump M2 and a water heater, and the spraying module comprises a spraying module and a drying module which are sequentially arranged along the conveying direction. The spraying module comprises a spraying pump M6 and an electric heater, the drying module comprises a drying fan M3 and an air heater, the control system controlled by the PLC comprises a PLC, a transformer BK, a relay K1, a relay K2, relays K4-K7 and a relay K11, and when the long dragon dish-washing machine works, dishes to be washed pass through the pre-washing module, the main washing module, the spraying module and the drying module in sequence in the conveying direction. The control system is controlled by a PLC, so that the control system is high in stability, reliability and flexibility and easy to maintain and expand.

Description

Technical Field

[0001] This utility model relates to the field of kitchen cleaning equipment technology, and in particular to a PLC-controlled long-line dishwasher. Background Technology

[0002] A dishwasher is a device that automatically cleans tableware such as bowls, chopsticks, plates, dishes, knives, and forks. Fully automatic dishwashers on the market can be divided into two categories: household and commercial. Household fully automatic dishwashers, as the name suggests, are only suitable for home use and mainly include cabinet-style, countertop-style, and sink-integrated models. Commercial dishwashers mainly include cabinet-style, lift-top (hood-style), basket-type, belt-type, and ultrasonic models, reducing the workload of kitchen staff in restaurants, hotels, and government canteens, improving work efficiency, and enhancing hygiene.

[0003] Long-line dishwashers are widely used in the catering industry. Their control system plays an important role in ensuring washing efficiency, reducing energy waste, and improving the stability of equipment operation. Existing long-line dishwashers are very inconvenient to operate, require more time to operate, and have lower work efficiency. Utility Model Content

[0004] The technical problem to be solved by this utility model is how to improve the reliability and flexibility of the long-range dishwasher.

[0005] This utility model solves the above-mentioned technical problems through the following technical solution: A PLC-controlled long-line dishwasher includes a PLC-controlled control system and a pre-wash module, a main wash module, a spray module, and a drying module arranged sequentially along the conveying direction. The pre-wash module includes a pre-wash pump M1, the main wash module includes a main wash pump M2 and a water heater, the spray module includes a spray pump M6 and an electric heater, and the drying module includes a drying fan M3 and an air heater. The PLC-controlled control system includes a PLC controller, a transformer BK, relays K1, K2, K4-K7, and K11. One end of relays K1, K2, and K4-K7 are respectively connected to three-phase AC power through a circuit breaker. The other end of the normally open contact of relay K1 is connected to multiple water heaters, and the normally open contact of relay K2... The other end is connected to multiple electric heaters. The other end of the normally open contact of relay K4 is connected to the air heater. The other end of the normally open contact of relay K5 is connected to the pre-wash pump M1. The other end of the normally open contact of relay K6 is connected to the main wash pump M2. The other end of the normally open contact of relay K7 is connected to the drying fan M3. The primary side of transformer BK is connected to three-phase AC power. The secondary side of transformer BK is connected to one end of the normally open contact of relay K11 through a circuit breaker. The other end of the normally open contact of relay K11 is connected to the spray pump M6. The other end of the secondary side of transformer BK is connected to one end of the coils of relay K1, relay K2, relay K4-K7, and relay K11. The other ends of the coils of relay K1, relay K2, relay K4-K7, and relay K11 are connected to the PLC controller.

[0006] Beneficial effects: When the long-line dishwasher of the present invention is working, the dishes to be washed pass through the pre-wash module, main wash module, spray module and drying module in sequence along the conveying direction. The control system adopts PLC control, which makes the control system highly stable, reliable, flexible and easy to maintain and expand. Through centralized control and monitoring, precise control of each functional module of the dishwasher can be achieved. According to different washing needs and equipment status, the consumption of water, electricity, detergent and other resources can be automatically adjusted, which can achieve efficient and energy-saving control of the dishwasher, ensuring the best washing effect while minimizing energy consumption.

[0007] Preferably, the PLC-controlled control system further includes circuit breakers Q1-Q8, circuit breaker Q11, relays K3 and K8, a changeover switch XAQ, a phase loss and phase sequence protector BH, a switching power supply DY, and a touch screen. The U, V, and W phases of the three-phase AC power are respectively connected to the U, V, and W phases of circuit breakers Q1-Q9 and the input terminals of the phase loss and phase sequence protector BH. One end of relays K1-K8 is connected to the U, V, and W phases of circuit breakers Q1-Q8. The other end of the normally open contact of relay K3 is connected to the electric heater E7, and the other end of the normally open contact of relay K8 is connected to the exhaust fan M4. The V and W phases of the three-phase AC power are connected to one end of circuit breaker Q10, and the other end of circuit breaker Q10 is connected to one end of the changeover switch XAQ. One end of the changeover switch XAQ is connected to the primary side of transformer BK. The secondary side of transformer BK is connected in series with the phase loss and phase sequence protector BH and then connected to the input end of the switching power supply DY. The output end of the switching power supply DY is connected to the power port of the touch screen and the power port of the PLC controller, respectively. The secondary side of transformer BK is also connected to one end of circuit breaker Q11 and fan M7. One end of the secondary side of transformer BK is connected to the PLC controller. The other end of the secondary side of transformer BK is connected to one end of the coils of relay K3 and relay K8. The other ends of the coils of relay K3 and relay K8 are connected to the PLC controller. The other end of circuit breaker Q11 is connected in series with the normally open contact of relay K11 and then connected to sprinkler pump M6. The PLC controller is connected to the touch screen for communication.

[0008] Beneficial effects: The dishwasher's operating status is displayed in real time via a touchscreen, providing a user-friendly interface that is easy to operate. If the dishwasher malfunctions, it will display scrolling text and flashing icons to alert staff, making it easy for them to check the dishwasher's status and perform timely inspection and repair.

[0009] Preferably, the PLC-controlled system further includes an inlet solenoid valve Y1 and a spray solenoid valve Y2. The inlet solenoid valve Y1 is connected between port Y11 of the PLC controller and the other end of the secondary side of the transformer BK, and the spray solenoid valve Y2 is connected between port Y12 of the PLC controller and the other end of the secondary side of the transformer BK.

[0010] Preferably, the pre-wash module further includes a high water level switch S1, a low water level switch S2, and a temperature sensor T1. One end of the high water level switch S1 is connected to one end of the low water level switch S2 and then connected to the negative power port of the PLC controller. The other end of the high water level switch S1 is connected to port X4 of the PLC controller, and the other end of the low water level switch S2 is connected to port X5 of the PLC controller. The temperature sensor T1 is connected to port AD0 of the PLC controller through a temperature transmitter.

[0011] Preferably, the main washing module further includes a high water level switch S3, a low water level switch S4, a temperature sensor T2, and a first overheat protector. One end of the high water level switch S3 is connected to one end of the low water level switch S4 and then connected to the negative power port of the PLC controller. The other end of the high water level switch S3 is connected to port X6 of the PLC controller, and the other end of the low water level switch S4 is connected to port X7 of the PLC controller. The temperature sensor T2 is connected to port AD1 of the PLC controller through a temperature transmitter. One end of the first overheat protector is connected to one end of the coil of relay K1, and the other end of the first overheat protector is connected to the other end of the secondary side of transformer BK.

[0012] Preferably, the spray module further includes a regeneration solenoid valve Y3, a high water level switch S5, a low water level switch S6, a temperature sensor T3, and a second overheat protector. The regeneration solenoid valve Y3 is connected between port Y13 of the PLC controller and the other end of the secondary side of the transformer BK. One end of the high water level switch S5 is connected to one end of the low water level switch S6 and then connected to the negative power port of the PLC controller. The other end of the high water level switch S5 is connected to port X10 of the PLC controller, and the other end of the low water level switch S6 is connected to port X11 of the PLC controller. The temperature sensor T3 is connected to port AD2 of the PLC controller through a temperature transmitter. One end of the second overheat protector is connected to one end of the coil of relay K2 and one end of the coil of relay K3, respectively. The other end of the second overheat protector is connected to the other end of the secondary side of the transformer BK.

[0013] Beneficial effects: By setting high and low water level switches in the pre-wash module, main wash module and spray module respectively, heating starts when the water reaches the low water level and heats while adding water. When the water reaches the high water level, water addition stops, instead of starting to heat up as soon as water is added, which can greatly save energy.

[0014] Preferably, the drying module further includes a temperature sensor T4 and a third overheat protector. The temperature sensor T4 is connected to port AD3 of the PLC controller via a temperature transmitter. One end of the third overheat protector is connected to one end of the coil of relay K4, and the other end of the third overheat protector is connected to the other end of the secondary side of transformer BK.

[0015] Beneficial effects: By installing overheat protectors in the main washing module, spray module and drying module respectively, when the module overheats, the overheat protector disconnects, the relay coil connected in series with the overheat protector loses power, the normally open contact of the relay opens, the circuit where the heater is located is disconnected, the heater loses power and stops heating, thus achieving overheat protection.

[0016] Preferably, the PLC-controlled long-line dishwasher further includes an inlet module and an outlet module. The inlet module is located at the front end of the pre-wash module, and the outlet module is located at the rear end of the drying module. The inlet module includes a relay ZJ1, a sensor switch, a start / stop switch AQ1, and a status indicator L1. The outlet module includes a relay ZJ2, a relay K9, outlet baffle limit switches JJ1-JJ2, a drive motor limit switch XK1, a geared motor M5, a frequency converter BP, a motor overload protection switch, a frequency converter overload protection switch, a start / stop switch AQ2, and a status indicator L2. The sensor switch includes a transmitting module HS1 and a receiving module HS2. One end of the coil of relay ZJ1 is connected to the switch. The negative terminal of the power supply DY output is connected to the other end of the relay ZJ1 coil, which is connected to ports BK and WH of the receiving module HS2. Ports BU of the receiving module HS2 and BU of the transmitting module HS1 are both connected to the negative terminal of the power supply DY output. Ports BN of the receiving module HS2 and BN of the transmitting module HS1 are both connected to the positive terminal of the power supply DY output. One end of the normally open contact of relay ZJ1 is connected to port X12 of the PLC controller, and one end of the normally open contact of relay ZJ2 is connected to port X13 of the PLC controller. The other ends of both normally open contacts of relay ZJ1 and relay ZJ2 are connected to the negative terminal of the power supply DY output. The start / stop switch AQ1 is normally open... The normally closed contact of the start / stop switch AQ2 is connected in series with the normally closed contact of the power supply between the negative power port and port X1 of the PLC controller. The normally open contacts of both the start / stop switch AQ1 and start / stop switch AQ2 are connected to the negative power supply between the negative power port and port X0 of the PLC controller. One end of the coil of relay ZJ2 is connected to the negative output terminal of the switching power supply DY, and the other end of the coil of relay ZJ2 is connected to one end of the outlet baffle limit switch JJ2. The other end of the outlet baffle limit switch JJ2 is connected to one end of the outlet baffle limit switch JJ1, and the other end of the outlet baffle limit switch JJ1 is connected to the positive output terminal of the switching power supply DY. One normally open contact of relay K9... One end is connected to the U, V, and W phases of the three-phase AC power supply. The other end of the normally open contact of relay K9 is connected to the geared motor M5 through the frequency converter BP. One end of the relay K9 coil is connected in series with the drive motor limit switch XK1 and then connected to the positive terminal of the switching power supply DY. One end of the relay K9 coil is connected to the negative terminal of the switching power supply DY. The motor overload protection switch and the frequency converter overload protection switch are connected in series between the negative terminal of the PLC controller power supply and port X14. One end of the status indicator L1 and one end of the status indicator L2 are connected to port Y14 of the PLC controller. The other ends of the status indicator L1 and the other ends of the status indicator L2 are respectively connected to the negative terminal of the switching power supply DY.

[0017] Preferably, the inlet module has a switch JJ3, the pre-wash module has a door magnetic switch JJ4, the main wash module has a door magnetic switch JJ5, and the spray module has a door magnetic switch JJ6. Switches JJ3, JJ4, JJ5, and JJ6 are connected in series and then connected between the negative power supply port of the PLC controller and port X3.

[0018] Preferably, the PLC-controlled control system further includes a power button AQ3, a status indicator light L3, a buzzer, a water supply detection switch P, a main wash drain valve detection switch JJ7, and a pre-wash drain valve detection switch JJ8. The power button AQ3 is connected in series between the negative power supply port and port X14 of the PLC controller. The status indicator light L3 is connected between port Y15 of the PLC controller and the negative output terminal of the switching power supply DY. The buzzer is connected between port Y16 of the PLC controller and the negative output terminal of the switching power supply DY. The water supply detection switch P is connected between the negative power supply port and port X16 of the PLC controller. The main wash drain valve detection switch JJ7 and the pre-wash drain valve detection switch JJ8 are connected in series and then connected between the negative power supply port and port X17 of the PLC controller. Attached Figure Description

[0019] Figure 1 A structural block diagram of a PLC-controlled long-line dishwasher provided for an embodiment of this utility model;

[0020] Figure 2 Electrical schematic diagram of a PLC-controlled long-line dishwasher provided for an embodiment of this utility model;

[0021] Figure 3 Electrical schematic diagram of a PLC-controlled long-line dishwasher provided for an embodiment of this utility model;

[0022] Figure 4 Electrical schematic diagram of a PLC-controlled long-line dishwasher provided for an embodiment of this utility model;

[0023] Figure 5 Electrical schematic diagram of a PLC-controlled long-line dishwasher provided for an embodiment of this utility model;

[0024] Figure 6 The electrical schematic diagram of a PLC-controlled long-line dishwasher provided for an embodiment of this utility model. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model are described clearly and completely below with reference to specific embodiments and accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0026] like Figure 1 As shown, this embodiment provides a PLC-controlled long-line dishwasher, including a PLC-controlled control system and a pre-wash module, a main wash module, a spray module, and a drying module arranged sequentially along the conveying direction. The pre-wash module includes a pre-wash pump M1, the main wash module includes a main wash pump M2 and water heaters E1, E2, and E3, the spray module includes a spray pump M6 and electric heaters E4, E5, and E6, and the drying module includes a drying fan M3 and an air heater E8. (See reference...) Figure 2-6 The PLC-controlled system includes a PLC controller, transformer BK, relays K1, K2, K4-K7, and K11. One end of relays K1, K2, and K4-K7 are connected to three-phase AC power via circuit breakers. The other end of the normally open contact of relay K1 is connected to multiple water heaters (E1, E2, and E3) connected in parallel. The other end of the normally open contact of relay K2 is connected to multiple electric heaters (E4, E5, and E6) connected in parallel. The other end of the normally open contact of relay K4 is connected to air heater E8. The other end of the normally open contact of relay K5 is connected to the pre-wash... Pump M1, the other end of the normally open contact of relay K6 is connected to the main washing pump M2, the other end of the normally open contact of relay K7 is connected to the drying fan M3, the primary side of transformer BK is connected to three-phase AC power, the secondary side of transformer BK is connected to one end of the normally open contact of relay K11 through a circuit breaker, the other end of the normally open contact of relay K11 is connected to spray pump M6, the other end of the secondary side of transformer BK is connected to one end of the coils of relay K1, relay K2, relay K4-K7, and relay K11, and the other end of the coils of relay K1, relay K2, relay K4-K7, and relay K11 is connected to the PLC controller.

[0027] When relay K5 is energized, its normally open contact closes, energizing pre-wash pump M1 to add water to the pre-wash tank. The dishes and utensils to be washed then enter the pre-wash module for the first wash cycle along the dishwasher's conveyor direction. When relay K6 is energized, its normally open contact closes, energizing main wash pump M2 to add water to the main wash tank. When relay K1 is energized, its normally open contact closes, energizing the water heater in the main wash tank to heat the water. The pre-washed dishes and utensils then enter the main wash module along the dishwasher's conveyor direction for the second wash cycle. When relay K11 is energized... When the normally open contact of K11 closes, the spray pump M6 is energized and begins to spray and clean the dishes and plates that have undergone the main wash. During the spraying process, the spray water can also be heated, i.e., the coil of relay K2 is energized, the normally open contact of relay K2 closes, and the circuit for electric heating is activated to start heating the spray water. After being sprayed, the dishes and plates finally enter the drying module for drying. At this time, the coil of relay K7 is energized, the normally open contact of relay K7 closes, and the drying fan M3 starts to work to dry the dishes and plates. During the drying process, the air can also be heated. At this time, the coil of relay K4 is energized, the normally open contact of relay K4 closes, and the air heater starts to work.

[0028] When the dishwasher of this invention is in operation, the bowls to be washed pass sequentially along the conveying direction through the pre-wash module, main wash module, spray module, and drying module. The control system is controlled by a PLC, which makes the control system highly stable, reliable, flexible, easy to maintain and expand. Through centralized control and monitoring, precise control of each functional module of the dishwasher can be achieved. According to different washing needs and equipment status, the consumption of resources such as water, electricity, and detergent can be automatically adjusted, which can achieve efficient and energy-saving control of the dishwasher, ensuring the best washing effect while minimizing energy consumption.

[0029] Continue reading Figure 2-6The PLC-controlled system also includes circuit breakers Q1-Q8, circuit breaker Q11, relays K3 and K8, a changeover switch XAQ, a phase loss and phase sequence protector BH, a switching power supply DY, and a touch screen. The U, V, and W phases of the three-phase AC power are connected to the U, V, and W phases of circuit breakers Q1-Q9 and the input terminals of the phase loss and phase sequence protector BH, respectively. One end of relays K1-K8 is connected to the U, V, and W phases of circuit breakers Q1-Q8. The other end of the normally open contact of relay K3 is connected to the electric heater E7, and the other end of the normally open contact of relay K8 is connected to the exhaust fan M4. The V and W phases of the three-phase AC power are connected to one end of circuit breaker Q10, and the other end of circuit breaker Q10 is connected to one end of the changeover switch XAQ. The other end of the switch XAQ is connected to the primary side of transformer BK. The secondary side of transformer BK is connected in series with the phase loss and phase sequence protector BH and then connected to the input terminal of the switching power supply DY. The output terminal of the switching power supply DY is connected to the power port of the touch screen and the power port of the PLC controller, respectively. The secondary side of transformer BK is also connected to one end of circuit breaker Q11 and fan M7. One end of the secondary side of transformer BK is connected to the PLC controller, and the other end of the secondary side of transformer BK is connected to one end of the coils of relays K3 and K8. The other ends of the coils of relays K3 and K8 are connected to the PLC controller. The other end of circuit breaker Q11 is connected in series with the normally open contact of relay K11 and then connected to spray pump M6. The PLC controller is connected to the touch screen for communication. Exhaust fan M4 is located at the top of the spray module. The top of the spray module, the control module, and the drying module are connected. Exhaust fan M4 exhausts some hot air, accelerating the gas circulation in this connected space and enhancing the drying effect. Fan M7 is used to dissipate heat from the control module.

[0030] Electric heaters E4, E5, E6, and E7 are all heaters inside the spray module heating box. They are all electrically heated water and are divided into two groups: electric heaters E4, E5, and E6 form one group, and electric heater E7 forms another group. The two groups of electric heaters operate at different times. When rapid heating is required, both groups of electric heaters work simultaneously. When rapid heating is not required, only one group of electric heaters needs to work to save energy.

[0031] The dishwasher's operating status is displayed in real time via a touchscreen, providing a user-friendly interface that is easy to operate. If the dishwasher malfunctions, it will display scrolling text and flashing icons to alert staff, making it easy for them to check the dishwasher's status and perform timely repairs.

[0032] The PLC controller is model LK2N-32, the changeover switch XAQ is model LW39-16B-9AC-02 / 1GR, the phase loss and phase sequence protector BH is model JVR380A, the switching power supply DY is model MDR-60-24, and the transformer BK is model JBK3-200VA.

[0033] See Figure 6 The PLC-controlled system also includes an inlet solenoid valve Y1 and a spray solenoid valve Y2. The inlet solenoid valve Y1 is connected between port Y11 of the PLC controller and the other end of the secondary side of the transformer BK, and the spray solenoid valve Y2 is connected between port Y12 of the PLC controller and the other end of the secondary side of the transformer BK.

[0034] See Figure 5-6 The pre-wash module also includes a high water level switch S1, a low water level switch S2, a temperature sensor T1, and a door magnetic control switch JJ4. One end of the high water level switch S1 is connected to one end of the low water level switch S2 and then connected to the negative power supply port of the PLC controller. The other end of the high water level switch S1 is connected to port X4 of the PLC controller, and the other end of the low water level switch S2 is connected to port X5 of the PLC controller. The temperature sensor T1 is connected to port AD0 of the PLC controller through a temperature transmitter.

[0035] The main washing module also includes a high water level switch S3, a low water level switch S4, a temperature sensor T2, a first overheat protector, and a door magnetic control switch JJ5. One end of the high water level switch S3 is connected to one end of the low water level switch S4 and then connected to the negative power supply port of the PLC controller. The other end of the high water level switch S3 is connected to port X6 of the PLC controller, and the other end of the low water level switch S4 is connected to port X7 of the PLC controller. The temperature sensor T2 is connected to port AD1 of the PLC controller through a temperature transmitter. One end of the first overheat protector is connected to one end of the coil of relay K1, and the other end of the first overheat protector is connected to the other end of the secondary side of transformer BK.

[0036] The spray module also includes a regeneration solenoid valve Y3, a high water level switch S5, a low water level switch S6, a temperature sensor T3, a second overheat protector, and a door magnetic control switch JJ6. The regeneration solenoid valve Y3 is connected between port Y13 of the PLC controller and the other end of the secondary side of the transformer BK. One end of the high water level switch S5 is connected to one end of the low water level switch S6 and then connected to the negative power port of the PLC controller. The other end of the high water level switch S5 is connected to port X10 of the PLC controller, and the other end of the low water level switch S6 is connected to port X11 of the PLC controller. The temperature sensor T3 is connected to port AD2 of the PLC controller through a temperature transmitter. One end of the second overheat protector is connected to one end of the coil of relay K2 and one end of the coil of relay K3, and the other end of the second overheat protector is connected to the other end of the secondary side of the transformer BK.

[0037] By setting high and low water level switches in the pre-wash module, main wash module, and spray module respectively, heating starts when the water reaches the low water level, and heating continues while water is added. When the water reaches the high water level, water addition stops, instead of starting heating as soon as water is added, which can greatly save energy.

[0038] The drying module also includes a temperature sensor T4 and a third overheat protector. The temperature sensor T4 is connected to port AD3 of the PLC controller via a temperature transmitter. One end of the third overheat protector is connected to one end of the coil of relay K4, and the other end of the third overheat protector is connected to the other end of the secondary side of transformer BK.

[0039] Overheat protection is achieved by installing overheat protectors in the main wash module, spray module, and drying module. For example, when overheating occurs in the main wash water tank, the overheat protector disconnects, the coil of relay K1 connected in series with the overheat protector is de-energized, the normally open contact of relay K1 opens, the circuit of the water heater is disconnected, and the water heater stops heating due to de-energization.

[0040] See Figure 5-6The PLC-controlled long-line dishwasher also includes an inlet module and an outlet module. The inlet module is located in front of the pre-wash module, and the outlet module is located behind the drying module. The inlet module includes relay ZJ1, switch JJ3, inductive switch, start / stop switch AQ1, and status indicator L1. The outlet module includes relay ZJ2, relay K9, outlet baffle limit switches JJ1-JJ2, drive motor limit switch XK1, geared motor M5, frequency converter BP, motor overload protection switch, frequency converter overload protection switch, start / stop switch AQ2, and status indicator L2. The inductive switch is an infrared through-beam inductive switch, including a transmitting module HS1 and a receiving module HS2. Relay ZJ1 has a coil. One end of the relay ZJ1 coil is connected to the negative terminal of the DY output of the switching power supply. The other end of the relay ZJ1 coil is connected to ports BK and WH of the receiving module HS2. Ports BU of the receiving module HS2 and BU of the transmitting module HS1 are both connected to the negative terminal of the DY output of the switching power supply. Ports BN of the receiving module HS2 and BN of the transmitting module HS1 are both connected to the positive terminal of the DY output of the switching power supply. One end of the normally open contact of relay ZJ1 is connected to port X12 of the PLC controller. One end of the normally open contact of relay ZJ2 is connected to port X13 of the PLC controller. The other ends of the normally open contacts of relays ZJ1 and ZJ2 are both connected to the negative terminal of the DY output of the switching power supply. (Start / Stop switch) The normally closed contact of AQ1 and the normally closed contact of start / stop switch AQ2 are connected in series between the negative power supply port and port X1 of the PLC controller. The normally open contacts of both start / stop switches AQ1 and AQ2 are connected between the negative power supply port and port X0 of the PLC controller. One end of the coil of relay ZJ2 is connected to the negative output terminal of the switching power supply DY, and the other end is connected to one end of the outlet baffle limit switch JJ2. The other end of outlet baffle limit switch JJ2 is connected to one end of outlet baffle limit switch JJ1, and the other end of outlet baffle limit switch JJ1 is connected to the positive output terminal of the switching power supply DY. The normally open contact of relay K9... One end of the relay is connected to the U, V, and W phases of the three-phase AC power supply. The other end of the normally open contact of the relay K9 is connected to the geared motor M5 through the frequency converter BP. One end of the relay K9 coil is connected in series with the drive motor limit switch XK1 and then connected to the positive terminal of the switching power supply DY. One end of the relay K9 coil is connected to the negative terminal of the switching power supply DY. The motor overload protection switch and the frequency converter overload protection switch are connected in series between the negative terminal of the PLC controller power supply and port X14. One end of the status indicator L1 is connected to one end of the status indicator L2 and then connected to port Y14 of the PLC controller. The other ends of the status indicator L1 and the other ends of the status indicator L2 are respectively connected to the negative terminal of the switching power supply DY.

[0041] The outlet baffle is a spring-loaded movable component. When dishes are not removed from the outlet module in time, the outlet baffle slides forward, the limit switch moves, the circuit is broken, the reducer stops rotating, and the equipment stops. When dishes need to be removed promptly, the outlet baffle automatically returns to its original position, the equipment resumes its ready-to-work state, and washing can continue only after the start button is pressed again. By setting inlet and outlet modules, it is possible to monitor whether dishes have entered the dishwasher. When a dish passes through the sensor switch of the inlet module, the normally open contact in the receiving module closes, the coil of relay ZJ1 is energized, and the normally open contact of relay ZJ1 closes, indicating that dishes have entered the dishwasher. When the outlet baffle limit switches JJ1 and JJ2 are closed, the coil of relay ZJ2 is energized, and the equipment operates normally. When the outlet baffle limit switches JJ1 or JJ2 are open, the coil of relay ZJ2 is de-energized, the normally open contact of relay ZJ2 opens, and the equipment stops operating.

[0042] Switches JJ3, JJ4, JJ5, and JJ6 are connected in series between the negative power supply port and port X3 of the PLC controller.

[0043] The PLC-controlled system also includes a power button AQ3 and a status indicator L3. The power button AQ3 is connected in series between the negative power supply port of the PLC controller and port X14, and the status indicator L3 is connected between port Y15 of the PLC controller and the negative output terminal of the switching power supply DY.

[0044] The PLC-controlled system also includes a buzzer, which is connected between port Y16 of the PLC controller and the negative terminal of the DY output of the switching power supply. The buzzer has fault diagnosis and early warning functions, enabling it to monitor the equipment's operating status in real time, detect potential problems, and promptly alert maintenance personnel to handle them, thus avoiding energy waste and efficiency reduction caused by equipment failure.

[0045] The PLC-controlled system also includes a water supply detection switch P, a main wash drain valve detection switch JJ7, and a pre-wash drain valve detection switch JJ8. The water supply detection switch P is connected between the negative power supply port and port X16 of the PLC controller. The main wash drain valve detection switch JJ7 and the pre-wash drain valve detection switch JJ8 are connected in series between the negative power supply port and port X17 of the PLC controller.

[0046] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A PLC-controlled long-line dishwasher, characterized in that: The system includes a PLC-controlled control system and pre-wash, main wash, spray, and drying modules arranged sequentially along the conveying direction. The pre-wash module includes a pre-wash pump M1; the main wash module includes a main wash pump M2 and a water heater; the spray module includes a spray pump M6 and an electric heater; and the drying module includes a drying fan M3 and an air heater. The PLC-controlled control system includes a PLC controller, a transformer BK, and relays K1, K2, K4-K7, and K11. One end of relays K1, K2, and K4-K7 are connected to three-phase AC power via circuit breakers. The other end of the normally open contact of relay K1 is connected to multiple water heaters, and the other end of the normally open contact of relay K2 is connected to multiple electric heaters. Relay K4... The other end of the normally open contact is connected to the air heater. The other end of the normally open contact of relay K5 is connected to the pre-wash pump M1. The other end of the normally open contact of relay K6 is connected to the main wash pump M2. The other end of the normally open contact of relay K7 is connected to the drying fan M3. The primary side of transformer BK is connected to three-phase AC power. The secondary side of transformer BK is connected to one end of the normally open contact of relay K11 through a circuit breaker. The other end of the normally open contact of relay K11 is connected to the spray pump M6. The other end of the secondary side of transformer BK is connected to one end of the coils of relay K1, relay K2, relay K4-K7, and relay K11. The other ends of the coils of relay K1, relay K2, relay K4-K7, and relay K11 are connected to the PLC controller.

2. The PLC-controlled long-line dishwasher according to claim 1, characterized in that: The PLC-controlled control system also includes circuit breakers Q1-Q8, circuit breaker Q11, relays K3 and K8, a changeover switch XAQ, a phase loss and phase sequence protector BH, a switching power supply DY, and a touch screen. The U, V, and W phases of the three-phase AC power are connected to the U, V, and W phases of circuit breakers Q1-Q9 and the input terminals of the phase loss and phase sequence protector BH, respectively. One end of relays K1-K8 is connected to the U, V, and W phases of circuit breakers Q1-Q8. The other end of the normally open contact of relay K3 is connected to the electric heater E7, and the other end of the normally open contact of relay K8 is connected to the exhaust fan M4. The V and W phases of the three-phase AC power are connected to one end of circuit breaker Q10, and the other end of circuit breaker Q10 is connected to one end of the changeover switch XAQ. The other end of the changeover switch XAQ is connected to the primary side of transformer BK. The secondary side of transformer BK is connected in series with the phase loss and phase sequence protector BH and then connected to the input terminal of the switching power supply DY. The output terminal of the switching power supply DY is connected to the power port of the touch screen and the power port of the PLC controller, respectively. The secondary side of transformer BK is also connected to one end of circuit breaker Q11 and fan M7. One end of the secondary side of transformer BK is connected to the PLC controller. The other end of the secondary side of transformer BK is connected to one end of the coils of relay K3 and relay K8. The other ends of the coils of relay K3 and relay K8 are connected to the PLC controller. The other end of circuit breaker Q11 is connected in series with the normally open contact of relay K11 and then connected to sprinkler pump M6. The PLC controller is connected to the touch screen for communication.

3. The PLC-controlled long-line dishwasher according to claim 1, characterized in that: The PLC-controlled system also includes an inlet solenoid valve Y1 and a spray solenoid valve Y2. The inlet solenoid valve Y1 is connected between port Y11 of the PLC controller and the other end of the secondary side of the transformer BK, and the spray solenoid valve Y2 is connected between port Y12 of the PLC controller and the other end of the secondary side of the transformer BK.

4. The PLC-controlled long-line dishwasher according to claim 1, characterized in that: The pre-wash module also includes a high water level switch S1, a low water level switch S2, and a temperature sensor T1. One end of the high water level switch S1 is connected to one end of the low water level switch S2 and then connected to the negative power port of the PLC controller. The other end of the high water level switch S1 is connected to port X4 of the PLC controller, and the other end of the low water level switch S2 is connected to port X5 of the PLC controller. The temperature sensor T1 is connected to port AD0 of the PLC controller through a temperature transmitter.

5. The PLC-controlled long-line dishwasher according to claim 1, characterized in that: The main washing module also includes a high water level switch S3, a low water level switch S4, a temperature sensor T2, and a first overheat protector. One end of the high water level switch S3 is connected to one end of the low water level switch S4 and then connected to the negative power port of the PLC controller. The other end of the high water level switch S3 is connected to port X6 of the PLC controller, and the other end of the low water level switch S4 is connected to port X7 of the PLC controller. The temperature sensor T2 is connected to port AD1 of the PLC controller through a temperature transmitter. One end of the first overheat protector is connected to one end of the coil of relay K1, and the other end of the first overheat protector is connected to the other end of the secondary side of transformer BK.

6. The PLC-controlled long-line dishwasher according to claim 1, characterized in that: The spray module also includes a regeneration solenoid valve Y3, a high water level switch S5, a low water level switch S6, a temperature sensor T3, and a second overheat protector. The regeneration solenoid valve Y3 is connected between port Y13 of the PLC controller and the other end of the secondary side of the transformer BK. One end of the high water level switch S5 is connected to one end of the low water level switch S6 and then connected to the negative power port of the PLC controller. The other end of the high water level switch S5 is connected to port X10 of the PLC controller, and the other end of the low water level switch S6 is connected to port X11 of the PLC controller. The temperature sensor T3 is connected to port AD2 of the PLC controller through a temperature transmitter. One end of the second overheat protector is connected to one end of the coil of relay K2 and one end of the coil of relay K3, and the other end of the second overheat protector is connected to the other end of the secondary side of the transformer BK.

7. The PLC-controlled long-line dishwasher according to claim 1, characterized in that: The drying module also includes a temperature sensor T4 and a third overheat protector. The temperature sensor T4 is connected to port AD3 of the PLC controller via a temperature transmitter. One end of the third overheat protector is connected to one end of the coil of relay K4, and the other end of the third overheat protector is connected to the other end of the secondary side of transformer BK.

8. The PLC-controlled long-line dishwasher according to claim 1, characterized in that: The PLC-controlled long-line dishwasher also includes an inlet module and an outlet module. The inlet module is located at the front end of the pre-wash module, and the outlet module is located at the rear end of the drying module. The inlet module includes a relay ZJ1, a sensor switch, a start / stop switch AQ1, and a status indicator L1. The outlet module includes a relay ZJ2, a relay K9, outlet baffle limit switches JJ1-JJ2, a drive motor limit switch XK1, a geared motor M5, a frequency converter BP, a motor overload protection switch, a frequency converter overload protection switch, a start / stop switch AQ2, and a status indicator L2. The sensor switch includes a transmitting module HS1 and a receiving module HS2. One end of the coil of relay ZJ1 is connected to the switching power supply D. The negative terminal of the Y output is connected to the other end of the relay ZJ1 coil, which is connected to ports BK and WH of the receiving module HS2. Ports BU of the receiving module HS2 and BU of the transmitting module HS1 are both connected to the negative terminal of the switching power supply DY. Ports BN of the receiving module HS2 and BN of the transmitting module HS1 are both connected to the positive terminal of the switching power supply DY. One end of the normally open contact of relay ZJ1 is connected to port X12 of the PLC controller, and one end of the normally open contact of relay ZJ2 is connected to port X13 of the PLC controller. The other ends of the normally open contacts of both relay ZJ1 and relay ZJ2 are connected to the negative terminal of the switching power supply DY. The normally closed contact of the start / stop switch AQ1... The normally closed contact of start / stop switch AQ2 is connected in series with the negative power supply port of the PLC controller and port X1. The normally open contacts of start / stop switches AQ1 and AQ2 are respectively connected to the negative power supply port of the PLC controller and port X0. One end of the coil of relay ZJ2 is connected to the negative output terminal of the switching power supply DY, and the other end is connected to one end of the outlet baffle limit switch JJ2. The other end of outlet baffle limit switch JJ2 is connected to one end of outlet baffle limit switch JJ1, and the other end of outlet baffle limit switch JJ1 is connected to the positive output terminal of the switching power supply DY. One end of the normally open contact of relay K9... The U, V, and W phases of the three-phase AC power supply are connected. The other end of the normally open contact of relay K9 is connected to the geared motor M5 through the frequency converter BP. One end of the relay K9 coil is connected in series with the drive motor limit switch XK1 and then connected to the positive terminal of the switching power supply DY. The other end of the relay K9 coil is connected to the negative terminal of the switching power supply DY. The motor overload protection switch and the frequency converter overload protection switch are connected in series between the negative terminal of the PLC controller power supply and port X14. One end of status indicator L1 and one end of status indicator L2 are connected to port Y14 of the PLC controller. The other ends of status indicator L1 and status indicator L2 are respectively connected to the negative terminal of the switching power supply DY.

9. The PLC-controlled long-line dishwasher according to claim 8, characterized in that: The inlet module has a switch JJ3, the pre-wash module has a door magnetic switch JJ4, the main wash module has a door magnetic switch JJ5, and the spray module has a door magnetic switch JJ6. Switches JJ3, JJ4, JJ5, and JJ6 are connected in series and then connected between the negative power supply port and port X3 of the PLC controller.

10. The PLC-controlled long-line dishwasher according to claim 1, characterized in that: The PLC-controlled system also includes a power button AQ3, a status indicator light L3, a buzzer, a water supply detection switch P, a main wash drain valve detection switch JJ7, and a pre-wash drain valve detection switch JJ8. The power button AQ3 is connected in series between the negative power supply port and port X14 of the PLC controller. The status indicator light L3 is connected between port Y15 of the PLC controller and the negative output terminal of the switching power supply DY. The buzzer is connected between port Y16 of the PLC controller and the negative output terminal of the switching power supply DY. The water supply detection switch P is connected between the negative power supply port and port X16 of the PLC controller. The main wash drain valve detection switch JJ7 and the pre-wash drain valve detection switch JJ8 are connected in series between the negative power supply port and port X17 of the PLC controller.

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