Water cooling station control system and method

Abstract

According to the water cooling station control system and method, the water inlet end of a main pump set is connected with a water tank, and the water outlet end of the main pump set is connected with a coil cabinet and a power cabinet; the water inlet end of the emergency pump is connected with the water tank; the water outlet end of the emergency pump is communicated with the main water pipe through an emergency water pipe; a first signal output end of the controller is electrically connected with a contactor of the main pump set, and a second signal output end of the controller is electrically connected with a contactor of the emergency pump through a hard wire interlocking circuit; when the controller breaks down, the hard wire interlocking circuit starts the emergency pump and is in linkage with the electric valve to be closed, the electric valve is installed on a first branch pipe of the main water pipe, and the first branch pipe is connected with the power cabinet. Thus, the hard wire interlocking circuit is connected with the emergency pump, a redundancy protection mechanism independent of the controller is constructed, and the emergency pump can be normally started even if control fails, so that sufficient water cooling is provided for the coil cabinet, the coil cabinet is prevented from being heated and burnt, and the production efficiency of the whole steel rolling production line is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water cooling of rolled steel, in particular to a water cooling station control system and method. BACKGROUND

[0002] The furnace zone induction heater is the core equipment of the rolled steel production line, mainly including a power cabinet, a coil cabinet and a water cooling station. The inductor coil in the coil cabinet is wound by a water-cooled copper pipe (the copper pipe is connected by tin soldering, and the soldering point is 183 DEG C), which needs to withstand an environmental temperature of about 460 DEG C during high-frequency heating, and must rely on the water cooling station to continuously supply water for cooling to avoid the melting failure of the weld. When the furnace zone induction heater is heated, the power cabinet also needs to rely on the water cooling station to supply water for cooling.

[0003] In the prior art, the main pump and the emergency pump are controlled by the output relay of the PLC controller. When the PLC controller has problems such as power failure, program crash, communication interruption or output module hardware damage, the main pump will stop running, and at the same time the emergency pump cannot be started, which will cause the furnace zone inductor system to lose water cooling, and further cause the coil cabinet to be burned due to insufficient cooling, thereby affecting the production efficiency of the entire rolled steel production line. SUMMARY

[0004] In view of the problems in the prior art, the embodiments of the present application provide a water cooling station control system and method to solve or partially solve the technical problems that when the PLC controller fails, the emergency pump of the water cooling station cannot be started, and further causes the coil cabinet to be burned due to insufficient cooling, thereby affecting the production efficiency of the entire rolled steel production line.

[0005] In a first aspect of the present application, a water cooling station control system is provided, which comprises a water tank, a controller, a main pump group, an emergency pump, a coil cabinet and a power cabinet. The water inlet end of the main pump group is connected to the water tank, and the water outlet end of the main pump group is connected to the coil cabinet and the power cabinet through a main water pipe. The water inlet end of the emergency pump is connected to the water tank, and the water outlet end of the emergency pump is communicated with the main water pipe through an emergency water pipe. The first signal output end of the controller is electrically connected to the contactor of the main pump group, and the second signal output end of the controller is electrically connected to the contactor of the emergency pump through a hard-wired interlocking circuit; wherein, When the controller fails, the hard-wired interlocking circuit starts the emergency pump, and the electric valve installed on the first branch pipe of the main water pipe is closed in linkage, and the first branch pipe is connected to the power cabinet.

[0006] In the scheme, the main pump group comprises a first main pump and a second main pump; the hard-wired interlocking circuit comprises a first contactor, a second contactor, a third contactor, a first relay, a second relay, a third relay, a first intermediate relay and a second intermediate relay; The main contact of the first contactor, the main contact of the second contactor and the main contact of the third contactor are connected to a power loop of the hard-wired interlocking circuit; The coil of the first contactor, the first relay, the coil of the second contactor, the second relay, the coil of the third contactor, the third relay, the first intermediate relay and the second intermediate relay are connected to a control loop of the hard-wired interlocking circuit; wherein, When the controller is in normal operation, the first contactor is used to control the start and stop of the first main pump; the second contactor is used to control the start and stop of the second main pump; the third contactor is used to control the start and stop of the emergency pump; the first intermediate relay is used to feed back the working state of the controller; and the second intermediate relay is used to control the opening and closing of the electromagnetic valve.

[0007] In the scheme, when the controller fails and the main pump group stops running, the normally closed contact of the first contactor, the normally closed contact of the second contactor and the normally open contact of the first relay are all disconnected; the second relay loses power; the normally closed contact of the second relay is closed; the third contactor and the electromagnetic valve are powered on; the emergency pump starts and the electromagnetic valve is closed.

[0008] In the scheme, the first intermediate relay is electrically connected to a second signal output end of the controller; and the second signal output end is a fault signal output end.

[0009] In the scheme, a first signal output end of the controller is also electrically connected to the emergency pump; and the first signal output end is a normal signal output end.

[0010] In the scheme, the system further comprises a plate heat exchanger; a backwater outlet of the plate heat exchanger is connected to a backwater pipeline; and the backwater pipeline is connected to the water outlet of the coil cabinet and the water outlet of the power cabinet respectively.

[0011] In the scheme, a float ball type liquid level switch is arranged in the water tank; the float ball type liquid level switch comprises a low liquid level normally closed contact and a high liquid level normally open contact; and the low liquid level normally closed contact and the high liquid level normally open contact are electrically connected to input ports of the controller respectively.

[0012] In the above scheme, when the controller is not malfunctioning and the water level in the water tank is below the lower limit, the controller controls the main pump group to stop working, controls the emergency pump to start working and controls the electromagnetic valve to close.

[0013] In a second aspect, the present application provides a water cooling station control method, which is applied in the water cooling station control system of any one of the first aspect; the method comprises: If the current working condition is controller malfunction, or the controller is malfunctioning and the water level in the water tank is below the lower limit, the main pump group stops working according to the fault signal, and the hard-wired interlocking circuit triggers the emergency pump to start working and triggers the electromagnetic valve to be in the closed state according to the fault signal; If the current working condition is that the controller is normal and the water level in the water tank is below the lower limit, the controller is used to control the main pump group to stop working, and the controller is used to control the emergency pump to start working and control the electromagnetic valve to close.

[0014] The present application provides a water cooling station control system and method, the system comprising: a water tank, a controller, a main pump group, an emergency pump, a coil cabinet and a power cabinet; the water inlet end of the main pump group is connected to the water tank, and the water outlet end of the main pump group is connected to the coil cabinet and the power cabinet through a main water pipe respectively; the water inlet end of the emergency pump is connected to the water tank, and the water outlet end of the emergency pump is communicated with the main water pipe through an emergency water pipe; the first signal output end of the controller is electrically connected with the contactor of the main pump group, and the second signal output end of the controller is electrically connected with the contactor of the emergency pump through a hard-wired interlocking circuit; wherein when the controller is malfunctioning, the hard-wired interlocking circuit starts the emergency pump and drives the electric valve to close, the electric valve is installed on a first branch pipe of the main water pipe, and the first branch pipe is connected to the power cabinet; in this way, the hard-wired interlocking circuit is connected with the emergency pump, a redundant protection mechanism independent of the controller is constructed, even if the control fails, the emergency pump can also start normally, so as to provide sufficient water cooling for the coil cabinet, avoid the coil cabinet from being burned due to heat, and further ensure the production efficiency of the entire rolling production line. BRIEF DESCRIPTION OF DRAWINGS

[0015] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are for purposes of illustration only and are not considered a limitation of the application. Moreover, like reference numerals are used to designate identical components throughout the specification and drawings. In the drawings: Figure 1 Fig. 1 shows a schematic diagram of the overall structure of a water cooling station control system according to an embodiment of the present application; Figure 2 Fig. 2 shows a schematic diagram of a power supply circuit of a hard-wired interlocking circuit according to an embodiment of the present application; Figure 3A control loop schematic diagram of a hard-wired interlocking circuit according to one embodiment of the present application is shown. Figure 4 A logic control schematic diagram of a first signal output port and a second signal output port of a controller according to one embodiment of the present application is shown. DETAILED DESCRIPTION

[0016] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood, and the scope of the present disclosure can be accurately conveyed to those skilled in the art.

[0017] The present application provides a water cooling station control system, such as Figure 1 As shown, the system comprises a water tank 1, a controller 2, a main pump set, an emergency pump 3, a coil cabinet 4 and a power cabinet 5; The water inlet end of the main pump set is connected to the water tank 1, and the water outlet end of the main pump set is connected to the coil cabinet 4 and the power cabinet 5 through a main water pipe 11 respectively; The water inlet end of the emergency pump 3 is connected to the water tank 1, and the water outlet end of the emergency pump 3 is communicated with the main water pipe through an emergency water pipe 12; The first signal output end of the controller 2 is electrically connected to the contactor of the main pump set, and the second signal output end of the controller 2 is electrically connected to the contactor of the emergency pump 3 through a hard-wired interlocking circuit 6; wherein, The first signal output end 20 is a normal signal output end, and the second signal output end 21 is a fault signal output end; when the controller 2 fails, the hard-wired interlocking circuit 6 starts the emergency pump 3, and the electric valve YV1 installed on the first branch pipe 71 of the main water pipe 11 is closed in linkage.

[0018] The main water pipe 11 further comprises a second branch pipe 72; the second branch pipe 72 is communicated with the water inlet of the coil cabinet 4.

[0019] In order to normally control the emergency pump 3 under normal working conditions, the first signal output end of the controller 2 is also electrically connected to the emergency pump 3.

[0020] Referring to Figure 1 , the main pump set comprises a first main pump 81 and a second main pump 82; The first branch pipe 71 is communicated with the water inlet of the coil cabinet 4, and the second water pipe 72 is communicated with the water inlet of the power cabinet 5; An electromagnetic valve YV1 is arranged on the second branch pipe 72; when the emergency pump 3 is started, the electromagnetic valve YV1 is triggered to be in a closed state.

[0021] A float ball type liquid level switch 9 is arranged in the water tank 1, and the float ball type liquid level switch 9 comprises a low liquid level normally closed contact 91 and a high liquid level normally open contact 92, which are electrically connected with the input port of the controller 2 respectively.

[0022] With reference to the foregoing Figure 1 , the system further comprises a plate heat exchanger 10; a backwater outlet of the plate heat exchanger 10 is connected with a backwater pipeline, and the backwater pipeline is connected with the water outlet of the coil cabinet 4 and the water outlet of the power supply cabinet 5 respectively. The outer circulating water enters the plate heat exchanger 10, and the circulating water is used for cooling the coil cabinet 4 and the power supply cabinet 5. After absorbing the heat generated by the operation of the coil cabinet 4 and the power supply cabinet 5, the temperature of the circulating water is increased, and the heat is transferred to the cooling medium on the other side through the plate heat exchanger, so that the temperature of the circulating water is reduced, and the circulating water can be returned to the equipment again for cooling, thereby ensuring that the coil cabinet 4 and the power supply cabinet 5 can be stably operated in a suitable temperature range.

[0023] In order to avoid the phenomenon that the whole system loses water cooling when the PLC controller fails in power supply, program crashes, communication interruption or output module hardware damage, etc., the main pump group stops running, and the emergency pump cannot be started, the application adds a hard-wired interlocking circuit 4 to the emergency pump 3. When the PLC controller fails, the main pump group cannot work due to the disconnection of the PLC controller signal. At this time, the hard-wired interlocking circuit can trigger the emergency pump 3 to start to provide cooling water.

[0024] And when the PLC controller fails, the main pump group will stop working due to the disconnection of the PLC controller signal. At this time, the power supply cabinet 5 does not need to be water-cooled. In this case, the emergency pump 3 is started, and the electromagnetic valve is closed to avoid the power supply cabinet 5 from shunting the emergency cooling water, so as to ensure that the limited emergency cooling water can cool down the coil cabinet 4, which is a key equipment.

[0025] Specifically, with reference to Figures 2 to 4 , the hard-wired interlocking circuit comprises: a first contactor KM1, a second contactor KM2, a third contactor KM3, a first relay K13, a second relay K14, a third relay K15, a first intermediate relay KA1 and a second intermediate relay KA2; The main contact of the first contactor KM1, the main contact of the second contactor KM2 and the main contact of the third contactor KM3 are connected into the power supply loop of the hard-wired interlocking circuit; The coil of the first contactor KM1, the first relay K13, the coil of the second contactor KM2, the second relay K14, the coil of the third contactor KM3, the third relay K15, the first intermediate relay KA1 and the second intermediate relay KA2 are connected into the control loop of the hard-wired interlocking circuit; wherein, When the controller is in normal operation, the first contactor KM1 is used to control the start and stop of the first main pump 81; the second contactor KM2 is used to control the start and stop of the second main pump 82; the third contactor KM3 is used to control the start and stop of the emergency pump 3, the first intermediate relay KA1 is used to feedback the working state of the controller 2, and the second intermediate relay KA2 is used to control the opening and closing of the electromagnetic valve YV1. Among them, the first intermediate relay KA1 is electrically connected with the second signal output end of the controller 2; the second signal output end is a fault signal output end.

[0026] Reference Figure 2 The power supply circuit of the hard-wired interlocking circuit further comprises: a first circuit breaker Q1, a second circuit breaker Q2, a third circuit breaker Q3, a first thermal relay FR1, a second thermal relay FR2, and a third thermal relay FR3; the first circuit breaker Q1, the second circuit breaker Q2, and the third circuit breaker Q3 have the functions of short-circuit protection, overload protection, and on-off circuit, and are used to turn on or turn off the three-phase alternating current power supply (L1, L2, and L3 are the incoming lines of the three-phase alternating current power supply). The first thermal relay FR1, the second thermal relay FR2, and the third thermal relay FR3 are overload protection elements, and when the pump is in normal operation, the contacts remain closed; if overload occurs, the current increases, the thermal element acts, the contacts are disconnected, the power supply is cut off, and the corresponding pump (main pump group or emergency pump) is protected.

[0027] The main contact of the first circuit breaker Q1, the main contact of the first contactor KM1, and the first thermal relay FR1 are connected in series, and then connected to the alternating current power supply; the first thermal relay FR1 is connected to the first main pump; The main contact of the second circuit breaker Q2, the main contact of the second contactor KM2, and the second thermal relay FR2 are connected in series, and then connected to the alternating current power supply; the second thermal relay FR1 is connected to the second main pump; The main contact of the third circuit breaker Q3, the main contact of the third contactor KM3, and the third thermal relay FR3 are connected in series, and then connected to the alternating current power supply; the third thermal relay FR3 is connected to the emergency pump.

[0028] As can be seen, in the power supply circuit, the three-phase power supply is connected to the corresponding pump through the circuit breaker, the contactor, and the thermal relay, and the start and stop of the pump and the overload protection are realized by controlling the on-off of the circuit breaker and the contactor.

[0029] Reference Figure 3 and Figure 4 In the control circuit of the hard-wired interlocking circuit, the DC 24V power supply provides direct current power for the entire control circuit, and is the energy source for the control signal and the action of the relay.

[0030] The fourth circuit breaker Q4 is the main switch of the control circuit, and after being turned on, the DC 24V is connected to the subsequent branch, realizing the on-off of the circuit and the basic protection.

[0031] The coil of the first contactor KM1 and the contact of the first relay K13 are connected in series and then connected to the 24V power supply, the coil of the second contactor KM2 and the contact of the second relay K14 are connected in series and then connected to the 24V power supply, and the coil of the third contactor KM3 and the contact of the third relay K15 are connected in series and then connected to the 24V power supply.

[0032] The first intermediate relay KA1 is connected to the second signal output end of the controller 2 and is used for feeding back the fault state of the controller 2; when the controller 2 is faulty, the second signal output end outputs a control signal (for example, outputs 0), the normally open contact of the KA1 is disconnected, the coil of the KA2 is de-energized, and the fault alarm function is triggered.

[0033] The second intermediate relay KA2 is mainly used for linkage control of the electromagnetic valve YV1 and is related to the operation state of the main pump group.

[0034] In actual application, when the controller 2 is faulty, the contacts of the first contactor KM1 and the second contactor KM2 are disconnected, the controller 2 outputs a fault signal, the normally open contact of the KA1 is disconnected, the KA2 is de-energized, the normally closed contact of the KA2 is closed, the third contactor KM3 and the electromagnetic valve YV1 are energized, the KM3 is closed after being energized, the emergency pump 3 is started, and the electromagnetic valve is closed after being energized.

[0035] When the first main pump or the second main pump is normally operated, the contact of the first contactor KM1 or the second contactor KM2 is closed, the coil of the second intermediate relay KA2 is energized, the normally closed contact of the KA2 is disconnected, the electromagnetic valve YV1 is de-energized and opened, and the first main pump or the second main pump supplies the cooling water to the power cabinet 5. The power cabinet 5 is also provided with a water distributor 51, which distributes the cooling water to various devices that need to be cooled.

[0036] In this way, when the controller 2 is faulty, the emergency pump 3 can be normally started, and at the same time, the electromagnetic valve YV1 is closed, so that the limited amount of cooling water is supplied to the coil cabinet 4, avoiding the shunting of the cooling water by non-critical devices.

[0037] It should be noted that when the controller 2 is normally operated, the emergency pump 3 is still controlled by the controller 2, so with reference to Figure 4 , the first signal output end of the controller 2 is also electrically connected to the emergency pump 3 through the third relay K15; the first signal output end is a normal signal output end. Similarly, the controller 2 also needs to control the start and stop of the first main pump and the second main pump, so the first signal output end also needs to be electrically connected to the first relay K13 and the second relay K14, respectively.

[0038] In practical applications, the first main pump, the second main pump and the emergency pump can be controlled according to different working conditions. In a normal working condition, the controller 2 controls the first main pump to operate according to a preset control logic, when the first main pump fails, the first main pump is closed and the second main pump is started to operate, the emergency pump is not started, and the electromagnetic valve YV1 is in an open state to normally supply water to the power cabinet 5 and the coil cabinet 4.

[0039] In an abnormal working condition, the following conditions are included: First, controller failure: If the controller fails in power supply, program crashes, communication terminal or output module hardware damage and the like, the first main pump and the second main pump stop operating, the second signal output end of the controller is disconnected, the hard-wired interlocking circuit triggers the emergency pump 3 to start within 50 ms, the electromagnetic valve YV1 is closed, and the water cooling station only supplies water to the coil cabinet 4.

[0040] Second, low water level in the water tank + normal controller: When the water level in the water tank 1 is too low, the low water level normally closed contact 91 is disconnected, the controller 1 controls the main pump group to stop operating through the normal control logic, the controller 2 starts the emergency pump 3, and the electromagnetic valve YV1 is closed in linkage, thereby closing the water supply branch of the power cabinet 5.

[0041] Third, low water level in the water tank + controller failure: This working condition is equivalent to the controller failure, and the control logic of the first abnormal working condition can be referred to below, which will not be described here.

[0042] Based on the same inventive concept as the foregoing embodiments, the application also provides a water cooling station control method applied in the water cooling station control system mentioned above, and the method comprises the following steps: If the current working condition is controller failure, or the controller failure and the water tank level is lower than the lower limit, the main pump group stops working according to the fault signal, the hard-wired interlocking circuit triggers the emergency pump to start according to the fault signal, and the electromagnetic valve is in a closed state; If the current working condition is that the controller is normal and the water tank level is lower than the lower limit, the main pump group is controlled to stop working by using the controller, and the emergency pump is controlled to start and the electromagnetic valve is controlled to close by using the controller.

[0043] Wherein, the control logic of the hard-wired interlocking circuit when the controller fails can be referred to the corresponding description above, and will not be described here.

[0044] As can be seen, the application designs the hard-wired interlocking circuit and the priority water supply strategy, and builds a redundant protection mechanism independent of the PLC controller, fundamentally solves the problems of unreliable emergency response and unreasonable water distribution of the existing water cooling station, and has the following beneficial effects: (1) Millisecond-level emergency response and high reliability start Hardware trigger independent of PLC controller: When the controller fails, the hard-wired interlocking circuit control loop directly acquires the "controller failure signal" through a hard-wire, without the need for PLC program operation, and forcibly starts the emergency pump within 50ms, which is 4-10 times faster than traditional PLC control (response time 200-500ms), ensuring that the coil weld is cooled within the critical water stop time (100ms).

[0045] (2) Core load water volume guarantee Hard-wired cut-off of non-critical load equipment: When the water tank is at a low liquid level, the liquid level switch synchronously disconnects the power cabinet electric valve YV1 control loop through a hard-wire, cutting off the power cabinet water supply and directing all the cooling water (100% of the designed flow rate) output by the emergency pump to the coil cabinet. Compared with the existing technology, which splits 30%-50% of the emergency water flow to the power cabinet, this scheme stabilizes the water inflow to the coil cabinet above the safety threshold, and the weld temperature can be controlled below 180℃ (lower than the tin solder melting point of 183℃), completely eliminating the risk of burning.

[0046] (3) Directional protection in water leakage scenarios In view of the characteristics of the power cabinet water connection joint, hard-wired cut-off of its water supply can prevent the water tank liquid level from continuously decreasing, and extend the emergency water supply time by more than 3 times, providing sufficient time for manual intervention.

[0047] Through one or more embodiments of the present application, the present application has the following beneficial effects or advantages: The present application provides a water cooling station control system and method, the system comprising: the water inlet end of the main pump group is connected to the water tank, and the water outlet end of the main pump group is connected to the coil cabinet and the power cabinet through a main water pipe; the water inlet end of the emergency pump is connected to the water tank, and the water outlet end of the emergency pump is communicated with the main water pipe through an emergency water pipe; the first signal output end of the controller is electrically connected with the contactor of the main pump group, and the second signal output end of the controller is electrically connected with the contactor of the emergency pump through a hard-wired interlocking circuit; wherein when the controller fails, the hard-wired interlocking circuit starts the emergency pump and drives the electric valve to close, the electric valve is installed on a first branch pipe of the main water pipe, and the first branch pipe is connected to the power cabinet; in this way, the hard-wired interlocking circuit is connected with the emergency pump, a redundant protection mechanism independent of the controller is constructed, even if the control fails, the emergency pump can be normally started, thereby providing sufficient water cooling for the coil cabinet, avoiding the coil cabinet from being heated and burned, and further ensuring the production efficiency of the entire rolling production line.

[0048] While the preferred embodiments of the application have been described, additional variations and modifications can be made to these embodiments by those skilled in the art once they have the benefit of the present disclosure. Therefore, the appended claims are intended to encompass all such variations and modifications as falling within the scope of the application.

[0049] The above descriptions are only the preferred embodiments of the application, not intended to limit the protection scope of the application. Any modification, equivalent replacement and improvement made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A water cooling station control system, characterized by, The system comprises a water tank, a controller, a main pump group, an emergency pump, a coil cabinet and a power cabinet; The water inlet end of the main pump group is connected to the water tank, and the water outlet end of the main pump group is connected to the coil cabinet and the power cabinet through a main water pipe respectively; The water inlet end of the emergency pump is connected to the water tank, and the water outlet end of the emergency pump is communicated with the main water pipe through an emergency water pipe; The first signal output end of the controller is electrically connected with the contactor of the main pump group, and the second signal output end of the controller is electrically connected with the contactor of the emergency pump through a hard-wired interlocking circuit; wherein, When the controller fails, the hard-wired interlocking circuit starts the emergency pump, and the electric valve installed on the first branch pipe of the main water pipe is closed in linkage.

2. The system of claim 1, wherein, The main pump group comprises a first main pump and a second main pump; the hard-wired interlocking circuit comprises a first contactor, a second contactor, a third contactor, a first relay, a second relay, a third relay, a first intermediate relay and a second intermediate relay; The main contact of the first contactor, the main contact of the second contactor and the main contact of the third contactor are connected to the power loop of the hard-wired interlocking circuit; The coil of the first contactor, the first relay, the coil of the second contactor, the second relay, the coil of the third contactor, the third relay, the first intermediate relay and the second intermediate relay are connected to the control loop of the hard-wired interlocking circuit; wherein, When the controller operates normally, the first contactor is used to control the start and stop of the first main pump; the second contactor is used to control the start and stop of the second main pump; the third contactor is used to control the start and stop of the emergency pump; the first intermediate relay is used to feed back the working state of the controller; and the second intermediate relay is used to control the opening and closing of the electromagnetic valve.

3. The system of claim 2, wherein; When the controller fails and the main pump group stops operating, the contact of the first contactor, the contact of the second contactor and the normally open contact of the first relay are all disconnected; the second relay loses power; the normally closed contact of the second relay is closed; the third contactor and the electromagnetic valve are powered on; the emergency pump is started, and the electromagnetic valve is closed.

4. The system of claim 2, wherein, The first intermediate relay is electrically connected with the second signal output end of the controller; and the second signal output end is a fault signal output end.

5. The system of claim 1, wherein, The first signal output end of the controller is also electrically connected with the emergency pump; and the first signal output end is a normal signal output end.

6. The system of claim 1, wherein, The system further comprises a plate heat exchanger; the backwater outlet of the plate heat exchanger is connected to a backwater pipeline, and the backwater pipeline is connected to the water outlet of the coil cabinet and the water outlet of the power cabinet respectively.

7. The system of claim 1, wherein, A float ball type liquid level switch is arranged in the water tank, and the float ball type liquid level switch comprises a low liquid level normally closed contact and a high liquid level normally open contact; the low liquid level normally closed contact and the high liquid level normally open contact are electrically connected with the input port of the controller respectively.

8. The system of claim 1, wherein, When the controller is not malfunctioning and the water tank liquid level is below the lower limit, the controller controls the main pump group to stop working, controls the emergency pump to start working and controls the electromagnetic valve to close.

9. A water cooling station control method characterized by, The method is applied to the water cooling station control system in any one of claims 1 to 8, and the method comprises: If the current working condition is that the controller is malfunctioning or the controller is malfunctioning and the water tank liquid level is below the lower limit, the main pump group stops working according to a malfunction signal, and the hard-wired interlocking circuit triggers the emergency pump to start working and triggers the electromagnetic valve to be in a closed state according to the malfunction signal; If the current working condition is that the controller is normal and the water tank liquid level is below the lower limit, the controller is used to control the main pump group to stop working, the controller is used to control the emergency pump to start working and the controller is used to control the electromagnetic valve to close.

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