Device for controlling overflow type pickling and rinsing conductivity

Abstract

The invention relates to a device for controlling overflow type pickling and rinsing conductivity, which comprises a conductivity automatic control system, a rinsing liquid control system and an HMI monitoring system, and solves the problems that the rinsing section process parameters of the original design often exceed the control range, the use amount of desalted water is large, and manual drainage is carried out. The utilization rate of desalted water is improved, and the cost of unit energy consumption, wastewater treatment, shutdown and the like is reduced.

Description

Technical Field

[0001] The invention relates to a device, in particular to a device for controlling the conductivity of overflow-type pickling and rinsing, and belongs to the technical field of mechanical equipment. Background Art

[0002] The thick plate pickling unit adopts a push-pull pickling process. The rinsing section is an important part of the pickling process. It adopts a five-level overflow cascade rinsing process. The rinsing water is used in each level of the rinsing tank to rinse the strip steel after pickling and squeezing, remove the acid and its mixture remaining on the surface of the strip steel, and avoid the yellow spot defects caused by the acid remaining on the surface of the strip steel. Limited by the original five-level overflow cascade structure, the process parameters of the rinsing section often exceed the control range, and the rinsing water needs to be replaced and continuously replenished, resulting in a large amount of desalted water used and a large amount of rinsing wastewater discharged, which increases the unit's energy consumption, wastewater treatment and shutdown costs.

[0003] After searching Chinese patents and related papers, no literature directly related to the control of overflow type pickling and rinsing conductivity device was found. In order to solve the problems of the original design of rinsing section process parameters often exceeding the control range, large amount of desalted water used and artificial drainage, it is necessary to develop a control overflow type pickling and rinsing conductivity device. Summary of the invention

[0004] The present invention aims at the problems existing in the prior art and provides a controlled overflow type pickling and rinsing conductivity device. This technical solution solves the problems of the original design of the rinsing section process parameters often exceeding the control range, large amount of desalted water used and manual drainage, etc., improves the utilization rate of desalted water, and reduces the unit's energy consumption, wastewater treatment and shutdown costs.

[0005] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: a device for controlling overflow type pickling and rinsing conductivity, the overflow type pickling and rinsing conductivity device comprising a conductivity automatic control system, a rinsing liquid control system and an HMI monitoring system, the conductivity automatic control system uses a basic automation program to control the conductivity and liquid level changes of the pickling and rinsing desalted water to stabilize them within the design requirements; the rinsing liquid control system uses a basic automation program to control the inlet and outlet volume of the pickling and rinsing desalted water, thereby improving the pre-rinsing capacity of the lower table; the HMI monitoring system detects the data such as the rinsing spray pressure, liquid level and conductivity, and tracks them online and gives real-time warnings, which facilitates the discovery and troubleshooting of abnormal device status.

[0006] As an improvement of the present invention, the conductivity automatic control system includes a wiring harness 1-19, a bus 1-21, a PLC 1-22, an acid tank entrance detection grating 1-11, an unwinder motor encoder 1-12, a pre-rinsing spray control valve 1-15, a rinsing water inlet control valve 1-16, a 1# tank emptying control valve 1-17, and a 2# tank emptying control valve 1-18; a 2# conductivity sensor 1-13, a 5# conductivity sensor 1-14, a 1# pressure sensor 1-1, a 2# pressure sensor 1-2, a 3# pressure sensor 1-3, a 4# pressure sensor 1-4, a 5# pressure sensor 1-5, a 1# liquid level meter 1-6, a 2# liquid level meter 1-7, a 3# liquid level meter 1-8, a 4# liquid level meter 1-9, and a 5# liquid level meter 1-10, wherein the acid tank entrance The detection grating 1-11, the uncoiler motor encoder 1-12, the pre-rinsing spray control valve 1-15, the rinsing water inlet control valve 1-16, the 1# tank emptying control valve 1-17, the 2# tank emptying control valve 1-18; the 2# conductivity sensor 1-13, the 5# conductivity sensor 1-14, the 1# pressure sensor 1-1, the 2# pressure sensor 1-2, the 3# pressure sensor 1-3, the 4# pressure sensor 1-4, the 5# pressure sensor 1-5, the 1# liquid level meter 1-6, the 2# liquid level meter 1-7, the 3# liquid level meter 1-8, the 4# liquid level meter 1-9, the 5# liquid level meter 1-10 are respectively connected to the PLC 1-22 terminal through the wiring harness 1-19, forming a conductivity automatic control system for controlling the overflow type pickling and rinsing conductivity device (see Figure 1 ).

[0007] As an improvement of the present invention, the HMI monitoring system includes HMI rinsing liquid level warning, HMI rinsing pressure warning and HMI rinsing water quality warning, and connects the PLC1-22 terminal with the HIM1-20 terminal through the bus 1-21 and transmits data to form a control overflow pickling rinsing conductivity device HMI monitoring system (see Figure 1 ); the HMI rinse water quality warning refers to the data monitoring of 2# conductivity sensor 1-13 and 5# conductivity sensor 1-14 on HIM1-20 respectively; the HMI rinse liquid level warning refers to the data monitoring of 1# liquid level gauge 1-6, 2# liquid level gauge 1-7, 3# liquid level gauge 1-8, 4# liquid level gauge 1-9, and 5# liquid level gauge 1-10 on HIM1-20 respectively; the HMI rinse spray pressure warning refers to the data monitoring of 1# pressure sensor 1-1, 2# pressure sensor 1-2, 3# pressure sensor 1-3, 4# pressure sensor 1-4, and 5# pressure sensor 1-5 on HIM1-20 respectively.

[0008] As an improvement of the present invention, the rinsing liquid control system includes a 5# pressure sensor 1-5, a 5# rinsing pump 2-1, a pipeline 2-2, a rinsing water inlet control valve 1-16, a 5# rinsing tank 2-3, a 5# liquid level gauge 1-10, a 4# rinsing tank 2-4, a 4# liquid level gauge 1-9, a 3# rinsing tank 2-5, a 3# liquid level gauge 1-8, a 3# liquid level gauge 1-8, a 2# rinsing tank 2-6, a 2# liquid level gauge 1-7, a 2# liquid level gauge 1-7, a 2# tank emptying control valve 1-18, a 1# rinsing tank 2-7, a 1# liquid level gauge 1-6, a rinsing wastewater tank 2-8, a wastewater pit 2-9, a 1# tank emptying control valve 1-17, and a 1# rinsing pump 2-10. , pre-rinsing spray control valve 1-15, pre-rinsing lower table spray beam 2-11, 1# rinsing tank 2-12, 1# pressure sensor 1-1, 2# rinsing tank 2-13, 2# conductivity sensor 1-13, 2# pressure sensor 1-2, 2# rinsing pump 2-14, 3# rinsing tank 2-15, 3# pressure sensor 1-3, 3# rinsing pump 2-16, 4# rinsing tank 2-17, 4# pressure sensor 1-4, 4# rinsing pump 2-18, 5# rinsing tank 2-19 and 5# conductivity sensor 1-14 are connected by welding and assembly as shown in a schematic diagram of a hydraulic control principle of a control overflow type pickling and rinsing conductivity device (see Figure 2); the 1# tank emptying control valve 1-17 and the 2# tank emptying control valve 1-18 are respectively installed on the bottom fixing holes of the 1# rinsing tank 2-7 and the 2# rinsing tank 2-6; the pressure sensor includes the 1# pressure sensor 1-1, the 2# pressure sensor 1-2, the 3# pressure sensor 1-3, the 4# pressure sensor 1-4 and the 5# pressure sensor 1-5, which are respectively installed on the 1# rinsing pump 2-10, the 2# rinsing pump 2-14, the 3# rinsing pump 2-16, the 4# rinsing pump 2-18, the 5# rinsing pump 2 -1 outlet pipe; the 2# conductivity sensor 1-13 and the 5# conductivity sensor 1-14 are respectively installed on the 2# rinsing pump 2-14 and the 5# rinsing pump 2-1 outlet pipe; the liquid level meter includes the 1# liquid level meter 1-6, the 2# liquid level meter 1-7, the 3# liquid level meter 1-8, the 4# liquid level meter 1-9 and the 5# liquid level meter 1-10, which are respectively installed on the bottom fixing holes of the 1# rinsing tank 2-7, the 2# rinsing tank 2-6, the 3# rinsing tank 2-5, the 4# rinsing tank 2-4 and the 5# rinsing tank 2-3. The overflow type pickling and rinsing conductivity device is provided with online tracking and real-time early warning of data such as rinsing spray pressure, liquid level and conductivity in the HIM monitoring system, which is convenient for discovering and troubleshooting abnormal device status; a large-flow pre-rinsing lower surface spray beam is provided in the liquid control system, which realizes a double-layer rinsing spray flushing water curtain for lower surface pre-rinsing, improves the lower surface pre-rinsing capacity, reduces the water quality conductivity value of 1-4# rinsing tanks, reduces the frequency of cascade flow of water replenishment in the rinsing tank, reduces the consumption of rinsing desalted water and the cost of rinsing wastewater; in the conductivity automatic control system, the pre-rinsing spray and conductivity are controlled more accurately, improves the stability and control level of the pickling and rinsing water quality, solves the problem that the overflow type rinsing tank is prone to backflow due to high liquid level, causing uncontrolled water quality deterioration, and avoids manual drainage, reducing the work intensity and risk of operators.

[0009] As an improvement of the present invention, the acid tank entrance detection grating 1-11 is a photoelectric position sensor. According to the sensing start time of the acid tank entrance detection grating 1-11, the position of the strip is simulated and calculated in combination with the uncoiler motor encoder 1-12 in the automation program, and the working time of the pre-rinsing spray control valve 1-15 of the pickling section is subtracted, thereby avoiding the rinsing spray amount that does not reach the rinsing section during low-speed operation, and preventing the 1-5# rinsing tank and tank from having too high a liquid level, resulting in the rinsing tank liquid level rising uncontrolled and reverse backflow, which pollutes the rinsing water quality.

[0010] The uncoiler motor encoder 1-12, combined with the induction start time of the entrance detection grating 1-11, simulates and calculates the travel distance of the strip in the automation program, subtracts the working time of the pre-rinsing spray control valve 1-15 in the pickling section, avoids the pre-rinsing spray that does not reach the rinsing section during low-speed operation, and prevents the 1-5# rinsing tank and tank from having too high a liquid level, resulting in uncontrolled reverse backflow due to the liquid level recovery in the rinsing tank, which pollutes the rinsing water quality.

[0011] As an improvement of the present invention, the pre-rinsing spray control valve 1-15 is an electrically controlled pneumatic butterfly valve, which is installed on the desalted water main pipeline. It is logically associated with the control (data setting is determined in combination with actual site conditions) when the strip approaches the rinsing section and starts working and stops working when it leaves the rinsing section. Its function is to control the pre-rinsing spray and the desalted water supply period of the pre-rinsing lower spray beam to ensure that the liquid levels of the 1# rinsing tank 2-7 and the 1# rinsing tank 2-12 are controlled to prevent backflow in the tank and overflow in the tank.

[0012] As an improvement of the present invention, the pre-rinsing lower surface spray beam 2-11 is an eight-hole spray pipe, each hole is equipped with a 0.2-0.4Mpa high-pressure nozzle, one end of the pipe 2-2 is connected to the pre-rinsing spray control valve 1-15 pipe 2-2, and the other end is connected to the middle of the eight-hole spray pipe. Its function is to form a double-layer rinse spray flushing water curtain on the lower surface of the 1# rinse tank 2-12, increase the pre-rinsing spray volume and spray effect, reduce the water quality conductivity value of the 1-4# rinse tank, and reduce the frequency of water replenishment cascade in the rinse tank.

[0013] As an improvement of the present invention, the 1# tank emptying control valve 1-17 is an electrically controlled pneumatic butterfly valve, which is installed on the emptying pipe 2-2 at the bottom of the 1# rinsing tank 2-7. It starts to work when the 2# conductivity sensor 1-13 shows that the conductivity of the 2# rinsing tank 2-6 exceeds 260μs / cm or the 1# liquid level meter 1-6 shows that the liquid level of the 1# rinsing tank 2-7 exceeds 1.7m, and stops working when the 1# liquid level meter 1-6 shows that the liquid level of the 1# rinsing tank 2-7 is lower than 1.3m, and performs logical association control (data setting is determined in combination with actual on-site conditions). Its function is to discharge the excessive and super-high desalted water in the 1# rinsing tank 2-7, ensure that the water quality of the 1# rinsing tank 2-7 meets the standard and the liquid level is controlled, and prevent the liquid level of the 1# rinsing tank 2-7 from continuously rising and causing reverse backflow, thereby polluting the rinsing water quality of the 2-5# rinsing tank.

[0014] As an improvement of the present invention, the 2# tank emptying control valve 1-18 is an electrically controlled pneumatic butterfly valve, which is installed on the emptying pipe 2-2 at the bottom of the 2# rinsing tank 2-6. It starts to work when the conductivity of the 5# rinsing tank 2-3 exceeds 30μs / cm or the liquid level of the 2# rinsing tank 2-6 exceeds 1.8m, and stops working when the liquid level of the 2# rinsing tank 2-6 is lower than 1.3m for associated control (data setting is determined in combination with actual site conditions). Its function is to discharge the excessive and super-high desalted water in the 2# rinsing tank 2-6, ensure that the water quality of the 2# rinsing tank 2-6 meets the standard and the liquid level is controlled, and prevent the 2# rinsing tank 2-6 liquid level from continuously rising and causing reverse backflow, thereby polluting the rinsing water quality of the 3-5# rinsing tank.

[0015] The rinse water inlet control valve 10 is an electrically controlled pneumatic butterfly valve, which is installed on the water inlet pipe 2-2 of the 5# rinse tank 2-3. It starts to work when the liquid level of any tank among the 1# rinse tank 2-7, the 2# rinse tank 2-6, the 3# rinse tank 2-5, the 4# rinse tank 2-4, and the 5# rinse tank 2-3 is lower than 1.3m, and stops working when the 2# conductivity sensor 1-13 shows that the conductivity of the 2# rinse tank 2-6 is lower than 20μs / cm or the 1# liquid level meter 1-6 shows that the liquid level of the 1# rinse tank 2-7 exceeds 1.65m. It is logically associated with the control (data setting is determined in combination with the actual situation on site). Its function is to provide new desalted water to ensure that the conductivity of the rinse desalted water is controlled.

[0016] As a further improvement, the HMI rinse spray pressure warning uses HMI software to monitor the data of 1# pressure sensor 1-1, 2# pressure sensor 1-2, 3# pressure sensor 1-3, 4# pressure sensor 1-4, and 5# pressure sensor 1-5 in segments (yellow warning for upper and lower lines, red warning for upper and lower lines, and blue normal). Its function is to monitor and warn the spray pressure of 1# rinse tank 2-12, 2# rinse tank 2-13, 3# rinse tank 2-15, 4# rinse tank 2-17, and 5# rinse tank 2-19 respectively, to prevent the problem of insufficient water pressure in a certain rinse tank spraying, resulting in abnormal or non-operating rinse pumps, and to provide a basis for judging whether pre-rinsing is not used or the pre-rinsing flow is low. It is prevented that the spray of a certain rinse tank has not worked for a long time, resulting in the uncontrolled rise of the liquid level in the rinse tank and reverse backflow, which pollutes the rinse water quality.

[0017] As a further improvement, the HMI rinse liquid level warning uses HMI software to monitor the data of 1# liquid level gauge 1-6, 2# liquid level gauge 1-7, 3# liquid level gauge 1-8, 4# liquid level gauge 1-9, and 5# liquid level gauge 1-10 in segments (yellow warning for upper and lower lines, red warning for upper and lower lines, and blue normal). Its function is to monitor and warn the liquid levels of 1# rinsing tank 2-7, 2# rinsing tank 2-6, 3# rinsing tank 2-5, 4# rinsing tank 2-4, and 5# rinsing tank 2-3 respectively to prevent the liquid level of a certain rinsing tank from rising uncontrollably and causing reverse backflow, which will pollute the rinsing water quality.

[0018] As a further improvement, the HMI rinse water quality warning uses HMI software to monitor the data of 2# conductivity sensor 1-13 and 5# conductivity sensor 1-14 in segments (yellow warning for upper and lower lines, red warning for upper and lower lines, and blue normal). Its function is to monitor and warn the conductivity of 2# rinse tank 2-13 and 5# rinse tank 2-19 respectively, and provide a judgment basis for the conductivity control of rinse water quality.

[0019] A control method for controlling an overflow type pickling and rinsing conductivity device, the control method is as follows:

[0020] S1 PLC follows the set spray control logic program: when PLC receives the acid tank entrance detection grating and strip threading signal, it starts to calculate the strip running distance into the rinsing section 0.4m, and the rinsing spray starts to work; when the strip completely passes through the rinsing section, the rinsing spray stops working.

[0021] S2 PLC follows the set rinse water inlet control logic program: when the liquid level of any of the 1-5# rinse tanks is lower than 1.3m, open the rinse water inlet control valve to replenish water to the 5# rinse tank; when the conductivity of the 2# rinse tank is lower than 20μs / cm or the liquid level of the 1# rinse tank exceeds 1.65m, close the rinse water inlet control valve to stop replenishing water to the 5# rinse tank.

[0022] S3 PLC follows the set 1# rinse tank conductivity control logic program: when the 2# rinse tank conductivity exceeds 260μs / cm or the 1# rinse tank liquid level exceeds 1.7m, the 1# tank emptying control valve opens and starts to drain the 1# rinse tank water; when the 1# rinse tank liquid level is lower than 1.3m, the 1# tank emptying control valve closes and stops draining the 1# rinse tank water.

[0023] S4 PLC follows the set conductivity control logic program of 2# rinsing tank: when the conductivity of 5# rinsing tank exceeds 30μs / cm or the liquid level of 2# rinsing tank exceeds 1.8m, the 2# tank emptying control valve opens and starts to drain the 2# rinsing tank water; when the liquid level of 2# rinsing tank is lower than 1.3m, the 2# tank emptying control valve closes and stops draining the 2# rinsing tank water.

[0024] S5 HIM rinse level warning: When the liquid level of a 1-5# rinse tank is lower than 1.3m or 1.65-1.9m, a yellow warning will be displayed; when it is 1.3-1.65m, a blue warning will be displayed; when it exceeds 1.9m or is lower than 0.9m, a red warning will be displayed.

[0025] S6 HMI rinse spray pressure warning: When the spray pressure of a 1-5# rinse tank is lower than 0.15-0.2Mpa, a yellow warning will be displayed; 0.2-0.35Mpa will be displayed in blue; and when it exceeds 0.35Mpa or is lower than 0.15Mpa, a red warning will be displayed.

[0026] S7 HIM rinse water quality warning: When the conductivity of a rinse in the 5# rinse tank is 1-160m, it will show blue, 160-260μs / cm will show yellow warning, and when it exceeds 260μs / cm or is lower than 1μs / cm, it will show red warning. When the conductivity of a rinse in the 2# rinse tank 2-6 is 1-20m, it will show blue, 20-30μs / cm will show yellow warning, and when it exceeds 30μs / cm or is lower than 1μs / cm, it will show red warning.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] 1) This technical solution is safe and reliable. The HIM monitoring system is equipped with online tracking and real-time early warning of data such as rinse spray pressure, liquid level and conductivity, which is convenient for discovering and troubleshooting abnormal device status.

[0029] 2) Reduce costs. A large-flow pre-rinsing lower surface spray beam is installed in the rinse liquid control system, realizing a double-layer rinsing spray flushing water curtain for lower surface pre-rinsing, improving the control level of yellow spot defects on the lower surface of special and irregular plates, improving the lower surface pre-rinsing capacity, reducing the water conductivity value of 1-4# rinsing tanks, reducing the frequency of water replenishment cascade in the rinsing tanks, reducing the consumption of rinsing desalted water and the cost of rinsing wastewater treatment.

[0030] 3) The conductivity automatic control system can control the pre-rinsing spray and conductivity more accurately, which improves the stability and control level of the pickling and rinsing water quality. It solves the problem that the overflow type rinsing tank is prone to backflow due to high liquid level, causing the rinsing process parameters to often exceed the control range and the water quality to deteriorate uncontrollably. At the same time, it avoids manual drainage and reduces the work intensity and risk of operators.

[0031] 4) The design and application design of the overflow type pickling and rinsing conductivity control device of the present invention can be widely used in similar overflow type water quality control problems and will achieve the same effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the electrical control principle of an overflow type pickling and rinsing conductivity control device;

[0033] Figure 2 A schematic diagram of the hydraulic control principle of an overflow type pickling and rinsing conductivity device.

[0034] In the figure: 1-1, 1# pressure sensor; 1-2, 2# pressure sensor; 1-3, 3# pressure sensor; 1-4, 4# pressure sensor; 1-5, 5# pressure sensor; 1-6, 1# liquid level gauge; 1-7, 2# liquid level gauge; 1-8, 3# liquid level gauge; 1-9, 4# liquid level gauge, 1-10, 5# liquid level gauge; 1-11, acid tank entrance detection grating; 1-12, unwinder motor encoder; 1-13, 2# conductivity sensor; 1-14, 5# conductivity sensor; 1-15, pre-rinse spray control valve; 1-16, rinse water inlet control valve; 1-17, 1# tank emptying control valve; 1-18, 2# tank emptying control valve; 1-19, wiring harness; 1-20, HIM; 1-21, bus; 1-22, PLC.

[0035] 2-1, 5# rinsing pump; 2-2, pipeline; 2-3, 5# rinsing tank; 2-4, 4# rinsing tank; 2-5, 3# rinsing tank; 2-6, 2# rinsing tank; 2-7, 1# rinsing tank; 2-8, rinsing wastewater tank; 2-9, wastewater pit; 2-10, 1# rinsing pump; 2-11, pre-rinsing lower surface spray beam; 2-12, 1# rinsing tank; 2-13, 2# rinsing tank; 2-14, 2# rinsing pump; 2-15, 3# rinsing tank; 2-16, 3# rinsing pump; 2-17, 4# rinsing tank; 2-18, 4# rinsing pump; 2-19, 5# rinsing tank. DETAILED DESCRIPTION

[0036] In order to deepen the understanding of the present invention, the present embodiment is described in detail below with reference to the accompanying drawings.

[0037] Example 1: Please refer to Figure 1 , 2 As shown, a control overflow type pickling and rinsing conductivity device of the present invention comprises a conductivity automatic control system, a rinsing liquid control system and an HMI monitoring system, wherein the conductivity automatic control system, the rinsing liquid control system and the HMI monitoring system are linked together through a wiring harness, a bus, a PLC, an HMI, a rinsing water inlet control valve, a tank emptying control valve, a pressure sensor, a conductivity sensor, a liquid level meter, a rinsing pump, etc.; the pressure sensor, the conductivity sensor, the liquid level meter, the rinsing tank, the rinsing tank, the rinsing pump, the rinsing nozzle, the wastewater tank, the wastewater pit, the pipeline, the bus, the PLC, the HMI and the wiring harness, the original system has been described no longer (the same below). The conductivity automatic control system comprises a wiring harness 1-19, a bus 1-21, a PLC 1-22, an acid tank entrance detection grating 1-11, an uncoiler motor encoder 1-12, a pre-rinsing spray control valve 1-15, a rinsing water inlet control valve 1-16, a 1# tank emptying control valve 1-17, and a 2# tank emptying control valve 1-18; a 2# conductivity sensor 1-13, a 5# conductivity sensor 1-14, a 1# pressure sensor 1-1, a 2# pressure sensor 1-2, a 3# pressure sensor 1-3, a 4# pressure sensor 1-4, a 5# pressure sensor 1-5, a 1# liquid level gauge 1-6, a 2# liquid level gauge 1-7, a 3# liquid level gauge 1-8, a 4# liquid level gauge 1-9, and a 5# liquid level gauge 1-10, and is constructed by connecting the wiring harnesses in series and parallel as shown in a schematic diagram of an electrical control principle of a control overflow type pickling and rinsing conductivity device (see Figure 1 ); The HMI monitoring system includes HMI rinsing liquid level warning, HMI rinsing pressure warning and HMI rinsing water quality warning, and is composed of bus 1-21, PLC1-22, HIM1-20 in series and parallel according to a schematic diagram of the electrical control principle of a control overflow pickling and rinsing conductivity device (see Figure 1); the rinsing liquid control system includes a 5# pressure sensor 1-5, a 5# rinsing pump 2-1, a pipeline 2-2, a rinsing water inlet control valve 1-16, a 5# rinsing tank 2-3, a 5# level gauge 1-10, a 4# rinsing tank 2-4, a 4# level gauge 1-9, a 3# rinsing tank 2-5, a 3# level gauge 1-8, a 3# level gauge 1-8, a 2# rinsing tank 2-6, a 2# level gauge 1-7, a 2# tank emptying control valve 1-18, a 1# rinsing tank 2-7, a 1# level gauge 1-6, a rinsing wastewater tank 2-8, a wastewater pit 2-9, a 1# tank emptying control valve 1-17, a 1# rinsing pump 2-10, a pre-rinsing spray The shower control valve 1-15, the pre-rinsing lower surface spray beam 2-11, the 1# rinsing tank 2-12, the 1# pressure sensor 1-1, the 2# rinsing tank 2-13, the 2# conductivity sensor 1-13, the 2# pressure sensor 1-2, the 2# rinsing pump 2-14, the 3# rinsing tank 2-15, the 3# pressure sensor 1-3, the 3# rinsing pump 2-16, the 4# rinsing tank 2-17, the 4# pressure sensor 1-4, the 4# rinsing pump 2-18, the 5# rinsing tank 2-19, the 5# conductivity sensor 1-14 are connected by welding and assembly as shown in a schematic diagram of a hydraulic control principle of a control overflow type pickling rinsing conductivity device (see Figure 2); the 1# tank emptying control valve 1-17 and the 2# tank emptying control valve 1-18 are respectively installed on the bottom fixing holes of the 1# rinsing tank 2-7 and the 2# rinsing tank 2-6; the pressure sensor includes the 1# pressure sensor 1-1; the 2# pressure sensor 1-2; the 3# pressure sensor 1-3; the 4# pressure sensor 1-4; the 5# pressure sensor 1-5, which are respectively installed on the 1# rinsing pump 2-10, the 2# rinsing pump 2-14, the 3# rinsing pump The washing pump 2-16, the 4# rinsing pump 2-18, and the 5# rinsing pump 2-1 outlet pipe; the 2# conductivity sensor 1-13 and the 5# conductivity sensor 1-14 are respectively installed on the 2# rinsing pump 2-14 and the 5# rinsing pump 2-1 outlet pipe; the level meter includes the 1# level meter 1-6, the 2# level meter 1-7, the 3# level meter 1-8, the 4# level meter 1-9, and the 5# level meter 1-10, which are respectively installed on the 1# rinsing tank 2 -7, 2# rinsing tank 2-6, 3# rinsing tank 2-5, 4# rinsing tank 2-4, 5# rinsing tank 2-3 bottom fixing holes; the overflow type pickling rinsing conductivity device is provided with online tracking and real-time early warning of rinsing spray pressure, liquid level and conductivity and other data in the HIM monitoring system, which is convenient for abnormal detection and troubleshooting of the device status; a large-flow pre-rinsing lower surface spray beam is provided in the liquid control system, which realizes the lower surface pre-rinsing double-layer rinsing spray flushing water curtain, improves the lower surface pre-rinsing capacity, reduces the water quality conductivity value of 1-4# rinsing tanks, reduces the frequency of water replenishment cascade in the rinsing tank, reduces the consumption of rinsing desalted water and the cost of rinsing wastewater; in the conductivity automatic control system, the pre-rinsing spray and conductivity are controlled more accurately, improves the stability and control level of the pickling rinsing water quality, solves the problem that the overflow type rinsing tank is prone to backflow due to high liquid level, causing uncontrolled water quality deterioration, and avoids manual drainage, reducing the work intensity and risk of operators.

[0038] The unit is started, the rinse pump is started, and the HIM monitoring system automatically detects the rinse spray pressure, liquid level, conductivity and other data. If the liquid level of the 1-5# rinse tank is lower than 1.3m or 1.65-1.9m, a yellow warning will be displayed, 1.3-1.65m will be displayed blue, and over 1.9m or lower than 0.9m will be displayed red. If the spray pressure of the 1-5# rinse tank is lower than 0.15-0.2Mpa, a yellow warning will be displayed, 0.2-0.35Mpa will be displayed blue, If the conductivity of a rinse in the 5# rinse tank is 1-160m, it will be blue, 160-260μs / cm will be yellow, and if it is over 260μs / cm or under 1μs / cm, it will be red. If the conductivity of a rinse in the 2# rinse tank is 1-20m, it will be blue, 20-30μs / cm will be yellow, and if it is over 30μs / cm or under 1μs / cm, it will be red. When PLC1-22 receives the acid tank entrance detection grating 1-11 and the strip threading signal, the unwinder motor encoder 1-12 starts to calculate the strip running distance. When it enters the rinse section 0.4m, the pre-rinse spray control valve 1-15 opens, and the rinse spray starts to work. When the strip passes through the rinse section completely, the pre-rinse spray control valve 1-15 closes, and the rinse spray stops working. When the liquid level of a certain rinsing tank of 1-5# is lower than 1.3m, open the rinse water inlet control valve 1-16 to add water to the 5# rinsing tank 2-3, until the 2# conductivity sensor 1-13 shows that the conductivity of the 2# rinsing tank 2-6 is lower than 20μs / cm or the 1# level meter 1-6 shows that the liquid level of the 1# rinsing tank 2-7 exceeds 1.65m, close the rinse water inlet control valve 1-16 to stop adding water to the 5# rinsing tank 2-3; when the 2# conductivity sensor 1-13 shows that the conductivity of the 2# rinsing tank 2-6 exceeds 260μs / cm or the 1# level meter 1-6 shows that the liquid level of the 1# rinsing tank 2-7 exceeds 1.7m, the 1# tank emptying control valve 1-17 is opened and opened. Start draining the water from 1# rinsing tank 2-7 until 1# liquid level gauge 1-6 shows that the liquid level of 1# rinsing tank 2-7 is lower than 1.3m, then 1# tank emptying control valve 1-17 is closed, and the water from 1# rinsing tank 2-7 is stopped; when 5# conductivity sensor 1-14 shows that the conductivity of 5# rinsing tank 2-3 exceeds 30μs / cm or 2# liquid level gauge 1-7 shows that the liquid level of 2# rinsing tank 2-6 exceeds 1.8m, 2# tank emptying control valve 1-18 is opened, and the water from 2# rinsing tank 2-6 is started to be drained until 2# liquid level gauge 1-7 shows that the liquid level of 2# rinsing tank 2-6 is lower than 1.3m, then 2# tank emptying control valve 1-18 is closed, and the water from 2# rinsing tank 2-6 is stopped.If the following two situations occur during use: 1. The pre-rinse lower surface spray beam 2-11, 1# tank emptying control valve 1-17, 2# tank emptying control valve 1-18, rinse water inlet control valve 1-16, pre-rinse spray control valve 1-15 and other electrical components are deformed and cannot be used normally; 2. The 1# tank emptying control valve 1-17, 2# tank emptying control valve 1-18, rinse water inlet control valve 1-16, pre-rinse spray control valve 1-15, acid tank entrance detection grating 1-11, unwinder motor encoder 1-12 and other electrical components are working abnormally; they should be used only after the fault is eliminated.

[0039] In this scheme, the acid tank entrance detection grating 1-11 is a photoelectric position sensor. According to the sensing start time of the acid tank entrance detection grating 1-11, the position of the strip is simulated and calculated in combination with the uncoiler motor encoder 1-12 in the automation program, and the working time of the pre-rinsing spray control valve 1-15 of the pickling section is subtracted, thereby avoiding the rinsing spray amount that does not reach the rinsing section during low-speed operation, and preventing the 1-5# rinsing tank and tank from having too high a liquid level, resulting in the rinsing tank liquid level rising uncontrolled and reverse backflow, which pollutes the rinsing water quality.

[0040] The uncoiler motor encoder 1-12, combined with the induction start time of the entrance detection grating 1-11, simulates and calculates the travel distance of the strip in the automation program, subtracts the working time of the pre-rinsing spray control valve 1-15 in the pickling section, avoids the pre-rinsing spray that does not reach the rinsing section during low-speed operation, and prevents the 1-5# rinsing tank and tank from having too high a liquid level, resulting in uncontrolled reverse backflow due to the liquid level recovery in the rinsing tank, which pollutes the rinsing water quality.

[0041] The pre-rinsing spray control valve 1-15 is an electrically controlled pneumatic butterfly valve installed on the desalted water main pipeline. It controls the logic association when the strip approaches the rinsing section and starts working, and stops working when it leaves the rinsing section (the data setting is determined in combination with the actual situation on site). Its function is to control the pre-rinsing spray and the desalted water supply period of the pre-rinsing lower spray beam to ensure that the liquid levels of 1# rinsing tank 2-7 and 1# rinsing tank 2-12 are controlled to prevent backflow in the tank and overflow in the tank.

[0042] The pre-rinsing lower surface spray beam 2-11 is an eight-hole spray pipe, each hole is equipped with a 0.2-0.4Mpa high-pressure nozzle, one end of the pipe 2-2 is connected to the pre-rinsing spray control valve 1-15 pipe 2-2, and the other end is connected to the middle of the eight-hole spray pipe. Its function is to form a double-layer rinse spray flushing water curtain on the lower surface of the 1# rinse tank 2-12, increase the pre-rinsing spray volume and spray effect, reduce the water quality conductivity value of the 1-4# rinse tank, and reduce the frequency of water replenishment cascade in the rinse tank.

[0043] 1# tank emptying control valve 1-17 is an electrically controlled pneumatic butterfly valve, installed on the bottom emptying pipe 2-2 of 1# rinsing tank 2-7. It starts to work when 2# conductivity sensor 1-13 shows that the conductivity of 2# rinsing tank 2-6 exceeds 260μs / cm or 1# liquid level meter 1-6 shows that the liquid level of 1# rinsing tank 2-7 exceeds 1.7m. It stops working when 1# liquid level meter 1-6 shows that the liquid level of 1# rinsing tank 2-7 is lower than 1.3m, and performs logical association control (data setting is determined in combination with actual site conditions). Its function is to discharge the excessive and high desalted water in 1# rinsing tank 2-7, ensure that the water quality of 1# rinsing tank 2-7 meets the standard and the liquid level is controlled, and prevent the liquid level of 1# rinsing tank 2-7 from continuously rising and causing reverse backflow, which pollutes the rinsing water quality of 2-5# rinsing tank.

[0044] 2# tank emptying control valve 1-18 is an electrically controlled pneumatic butterfly valve, installed on the bottom emptying pipe 2-2 of 2# rinsing tank 2-6. It starts to work when the conductivity of 5# rinsing tank 2-3 exceeds 30μs / cm or the liquid level of 2# rinsing tank 2-6 exceeds 1.8m. It stops working and performs associated control when the liquid level of 2# rinsing tank 2-6 is lower than 1.3m (data setting is determined in combination with actual site conditions). Its function is to discharge the excessive and high desalted water in 2# rinsing tank 2-6, ensure that the water quality of 2# rinsing tank 2-6 meets the standard and the liquid level is controlled, and prevent the liquid level of 2# rinsing tank 2-6 from continuously rising and causing reverse backflow, which pollutes the rinsing water quality of 3-5# rinsing tank.

[0045] The rinse water inlet control valve 10 is an electrically controlled pneumatic butterfly valve, which is installed on the water inlet pipe 2-2 of the 5# rinse tank 2-3. It starts to work when the liquid level of any tank among the 1# rinse tank 2-7, the 2# rinse tank 2-6, the 3# rinse tank 2-5, the 4# rinse tank 2-4, and the 5# rinse tank 2-3 is lower than 1.3m, and stops working when the 2# conductivity sensor 1-13 shows that the conductivity of the 2# rinse tank 2-6 is lower than 20μs / cm or the 1# liquid level meter 1-6 shows that the liquid level of the 1# rinse tank 2-7 exceeds 1.65m. It is logically associated with the control (data setting is determined in combination with the actual situation on site). Its function is to provide new desalted water to ensure that the conductivity of the rinse desalted water is controlled.

[0046] The HMI rinse spray pressure warning uses HMI software to monitor the data of 1# pressure sensor 1-1, 2# pressure sensor 1-2, 3# pressure sensor 1-3, 4# pressure sensor 1-4, and 5# pressure sensor 1-5 in segments (yellow warning for upper and lower lines, red warning for upper and lower lines, and blue normal). Its function is to monitor and warn the spray pressure of 1# rinse tank 2-12, 2# rinse tank 2-13, 3# rinse tank 2-15, 4# rinse tank 2-17, and 5# rinse tank 2-19 respectively, to prevent the problem of insufficient water pressure in a certain rinse tank spraying, resulting in abnormal or non-operating rinse pumps, and to provide a basis for judging whether pre-rinsing is not used or the pre-rinsing flow is low. It prevents a certain rinse tank from spraying for a long time, resulting in the problem of uncontrolled reverse backflow of the rinse tank liquid level, which pollutes the rinse water quality.

[0047] The HMI rinse liquid level warning uses HMI software to monitor the data of 1# liquid level gauge 1-6, 2# liquid level gauge 1-7, 3# liquid level gauge 1-8, 4# liquid level gauge 1-9, and 5# liquid level gauge 1-10 in segments (yellow warning for upper and lower lines, red warning for upper and lower lines, and blue normal). Its function is to monitor and warn the liquid levels of 1# rinsing tank 2-7, 2# rinsing tank 2-6, 3# rinsing tank 2-5, 4# rinsing tank 2-4, and 5# rinsing tank 2-3 respectively, to prevent the liquid level of a certain rinsing tank from rising uncontrollably and causing reverse backflow, thereby polluting the rinsing water quality.

[0048] The HMI rinse water quality warning uses HMI software to monitor the data of 2# conductivity sensor 1-13 and 5# conductivity sensor 1-14 in segments (yellow warning for upper and lower lines, red warning for upper and lower lines, and blue normal). Its function is to monitor and warn the conductivity of 2# rinse tank 2-13 and 5# rinse tank 2-19, and provide a judgment basis for the conductivity control of rinse water quality.

[0049] The control method is as follows: A control method for controlling an overflow type pickling and rinsing conductivity device of the present invention comprises the following steps:

[0050] S1 PLC follows the set spray control logic program: when PLC receives the acid tank entrance detection grating and strip threading signal, it starts to calculate the strip running distance into the rinsing section 0.4m, and the rinsing spray starts working; when the strip completely passes through the rinsing section, the rinsing spray stops working.

[0051] S2 PLC follows the set rinse water inlet control logic program: when the liquid level of any of the 1-5# rinse tanks is lower than 1.3m, open the rinse water inlet control valve to replenish water to the 5# rinse tank; when the conductivity of the 2# rinse tank is lower than 20μs / cm or the liquid level of the 1# rinse tank exceeds 1.65m, close the rinse water inlet control valve to stop replenishing water to the 5# rinse tank.

[0052] S3 PLC follows the set conductivity control logic program of 1# rinsing tank: when the conductivity of 2# rinsing tank exceeds 260μs / cm or the liquid level of 1# rinsing tank exceeds 1.7m, the 1# tank emptying control valve opens and starts to drain the water from 1# rinsing tank; when the liquid level of 1# rinsing tank is lower than 1.3m, the 1# tank emptying control valve closes and stops draining the water from 1# rinsing tank.

[0053] S4 PLC follows the set conductivity control logic program of 2# rinsing tank: when the conductivity of 5# rinsing tank exceeds 30μs / cm or the liquid level of 2# rinsing tank exceeds 1.8m, the 2# tank emptying control valve opens and starts to drain the water from 2# rinsing tank; when the liquid level of 2# rinsing tank is lower than 1.3m, the 2# tank emptying control valve closes and stops draining the water from 2# rinsing tank.

[0054] S5 HIM rinse level warning: When the liquid level of a certain 1-5# rinse tank is lower than 1.3m or 1.65-1.9m, a yellow warning will be displayed; 1.3-1.65m will display a blue warning; and more than 1.9m or lower than 0.9m will display a red warning.

[0055] S6 HMI rinse spray pressure warning: When the spray pressure of a 1-5# rinse tank is lower than 0.15-0.2Mpa, a yellow warning will be displayed; 0.2-0.35Mpa will be displayed in blue; and when it exceeds 0.35Mpa or is lower than 0.15Mpa, a red warning will be displayed.

[0056] S7 HIM rinse water quality warning: When the conductivity of a rinse in the 5# rinse tank is 1-160m, it will show blue, 160-260μs / cm will show yellow warning, and when it exceeds 260μs / cm or is lower than 1μs / cm, it will show red warning. When the conductivity of a rinse in the 2# rinse tank 2-6 is 1-20m, it will show blue, 20-30μs / cm will show yellow warning, and when it exceeds 30μs / cm or is lower than 1μs / cm, it will show red warning.

[0057] It should be noted that the above embodiments are not intended to limit the protection scope of the present invention, and equivalent changes or substitutions made on the basis of the above technical solutions all fall within the protection scope of the claims of the present invention.

Claims

1. A device for controlling the conductivity of overflow pickling and rinsing, characterized in that: The overflow type pickling and rinsing conductivity device includes a conductivity automatic control system, a rinsing liquid control system and an HMI monitoring system. The conductivity automatic control system uses a basic automation program to control the conductivity and liquid level changes of the pickling and rinsing desalted water to stabilize them within the design requirements; the rinsing liquid control system uses a basic automation program to control the inlet and outlet volume of the pickling and rinsing desalted water, thereby improving the pre-rinsing capacity of the lower table; the HMI monitoring system detects the rinse spray pressure, liquid level, conductivity and other data for online tracking and real-time warning, which is convenient for discovering and troubleshooting abnormal device status.

2. The overflow type pickling and rinsing conductivity control device according to claim 1 is characterized in that: The conductivity automatic control system includes a wiring harness (1-19), a bus (1-21), a PLC (1-22), an acid tank entrance detection grating (1-11), an unwinder motor encoder (1-12), a pre-rinsing spray control valve (1-15), a rinsing water inlet control valve (1-16), a 1# tank emptying control valve (1-17), a 2# tank emptying control valve (1-18); a 2# conductivity sensor (1-13), a 5# conductivity sensor (1-14), a 1# pressure sensor (1-1), a 2# pressure sensor (1-2), a 3# pressure sensor (1-3), a 4# pressure sensor (1-4), a 5# pressure sensor (1-5), a 1# liquid level meter (1-6 ), 2# liquid level meter (1-7), 3# liquid level meter (1-8), 4# liquid level meter (1-9), 5# liquid level meter (1-10), the acid tank inlet detection grating, unwinder motor encoder, pre-rinsing spray control valve, rinsing water inlet control valve, 1# tank emptying control valve, 2# tank emptying control valve; 2# conductivity sensor, 5# conductivity sensor, 1# pressure sensor, 2# pressure sensor, 3# pressure sensor, 4# pressure sensor, 5# pressure sensor, 1# liquid level meter, 2# liquid level meter, 3# liquid level meter, 4# liquid level meter, 5# liquid level meter are respectively connected to the PLC terminal through a wiring harness to form a conductivity automatic control system for controlling an overflow type pickling and rinsing conductivity device.

3. The overflow type pickling and rinsing conductivity control device according to claim 2, characterized in that: The HMI monitoring system includes HMI rinsing liquid level warning, HMI rinsing pressure warning and HMI rinsing water quality warning. The PLC terminal is connected to the HIM terminal through a bus and data is transmitted to form an HMI monitoring system for controlling the overflow type pickling and rinsing conductivity device.

4. The overflow type pickling and rinsing conductivity control device according to claim 3 is characterized in that: The rinsing liquid control system comprises a 5# pressure sensor (1-5), a 5# rinsing pump (2-1), a pipeline (2-2), a rinsing water inlet control valve (1-16), a 5# rinsing tank (2-3), a 5# liquid level gauge (1-10), a 4# rinsing tank (2-4), a 4# liquid level gauge (1-9), a 3# rinsing tank (2-5), a 3# liquid level gauge (1-8), a 3# liquid level gauge (1-8), a 2# rinsing tank (2-6), a 2# liquid level gauge (1-7), a 2# liquid level gauge (1-7), and a 2# tank emptying control valve (1-18). , 1# rinsing tank (2-7), 1# liquid level meter (1-6), rinsing wastewater tank (2-8), wastewater pit (2-9), 1# tank emptying control valve (1-17), 1# rinsing pump (2-10), pre-rinsing spray control valve (1-15), pre-rinsing lower surface spray beam (2-11), 1# rinsing tank (2-12), 1# pressure sensor (1-1), 2# rinsing tank (2-13), 2# conductivity sensor (1-13), 2# pressure sensor (1-2), 2# rinsing pump (2-14), 3# rinsing tank (2-15), 3# pressure sensor (1-3), 3# rinsing pump (2-16), 4# rinsing tank (2-17), 4# pressure sensor (1-4), 4# rinsing pump (2-18), 5# rinsing tank (2-19) and 5# conductivity sensor (1-14), the 1# tank emptying control valve (1-17) and the 2# tank emptying control valve (1-18) are respectively installed on the fixing holes at the bottom of the 1# rinsing tank and the 2# rinsing tank; the pressure sensor includes the 1# pressure sensor, the 2# pressure sensor, the 3# pressure sensor The sensor, 4# pressure sensor and 5# pressure sensor are respectively installed on the outlet pipes of 1# rinsing pump, 2# rinsing pump, 3# rinsing pump, 4# rinsing pump and 5# rinsing pump; the 2# conductivity sensor and 5# conductivity sensor are respectively installed on the outlet pipes of 2# rinsing pump and 5# rinsing pump; the liquid level meter includes 1# liquid level meter, 2# liquid level meter, 3# liquid level meter, 4# liquid level meter and 5# liquid level meter, which are respectively installed on the fixing holes at the bottom of 1# rinsing tank, 2# rinsing tank, 3# rinsing tank, 4# rinsing tank and 5# rinsing tank.

5. The overflow type pickling and rinsing conductivity control device according to claim 3 or 4, characterized in that: The acid tank entrance detection grating (1-11) is a photoelectric position sensor. According to the induction start time of the acid tank entrance detection grating, the position of the strip is simulated and calculated in combination with the uncoiler motor encoder (1-12) in the automation program, and the working time of the pre-rinsing spray control valve in the pickling section is subtracted. The uncoiler motor encoder (1-12) is combined with the induction start time of the entrance detection grating to simulate and calculate the travel distance of the strip in the automation program, and the working time of the pre-rinsing spray control valve in the pickling section is subtracted, thereby avoiding the problem that the pre-rinsing spray in the rinsing section is not reached due to low-speed operation, and preventing the liquid level of the 5# rinsing tank from being too high, resulting in the problem that the liquid level of the rinsing tank rises uncontrollably and reverse flow occurs, thereby polluting the rinsing water quality.

6. The overflow type pickling and rinsing conductivity control device according to claim 6, characterized in that: The pre-rinsing spray control valve is an electrically controlled pneumatic butterfly valve installed on the desalted water main pipeline.

7. The overflow type pickling and rinsing conductivity control device according to claim 6, characterized in that: The pre-rinsing lower surface spray beam is an eight-hole spray pipe, each hole is equipped with a 0.2-0.4Mpa high-pressure nozzle, one end of the pipeline is connected to the pre-rinsing spray control valve pipeline, and the other end is connected to the middle of the eight-hole spray pipe.

8. The overflow type pickling and rinsing conductivity control device according to claim 6, characterized in that: The 1# tank emptying control valve is an electrically controlled pneumatic butterfly valve, which is installed on the bottom emptying pipe of the 1# rinsing tank. It starts working when the 2# conductivity sensor shows that the conductivity of the 2# rinsing tank exceeds 260μs / cm or the 1# liquid level meter shows that the liquid level of the 1# rinsing tank exceeds 1.7m, and stops working when the 1# liquid level meter shows that the liquid level of the 1# rinsing tank is lower than 1.3m, and performs logical association control.

9. The overflow type pickling and rinsing conductivity control device according to claim 6, characterized in that: The 2# tank emptying control valve is an electrically controlled pneumatic butterfly valve installed on the bottom emptying pipe of the 2# rinsing tank. It starts to work when the conductivity of the 5# rinsing tank exceeds 30μs / cm or the liquid level of the 2# rinsing tank exceeds 1.8m. It stops working and performs associated control when the liquid level of the 2# rinsing tank is lower than 1.3m. The rinse water inlet control valve is an electrically controlled pneumatic butterfly valve, which is installed on the water inlet pipe of the 5# rinse tank. It starts working when the liquid level of any of the 1# rinse tank, 2# rinse tank, 3# rinse tank, 4# rinse tank, and 5# rinse tank is lower than 1.3m, and stops working when the 2# conductivity sensor shows that the conductivity of the 2# rinse tank is lower than 20μs / cm or the 1# liquid level meter shows that the liquid level of the 1# rinse tank 2-7 exceeds 1.65m, and is controlled by logic association.

10. A method for controlling the conductivity of an overflow pickling and rinsing device, characterized in that: Using the device described in any one of claims 1 to 9, the control method is as follows: S1 PLC follows the set spray control logic program: when PLC receives the acid tank entrance detection grating and strip threading signal, it starts to calculate the strip running distance into the rinsing section 0.4m, and the rinsing spray starts to work; when the strip completely passes through the rinsing section, the rinsing spray stops working. S2 PLC follows the set rinse water inlet control logic program: when the liquid level of any of the 1-5# rinse tanks is lower than 1.3m, open the rinse water inlet control valve to replenish water to the 5# rinse tank; when the conductivity of the 2# rinse tank is lower than 20μs / cm or the liquid level of the 1# rinse tank exceeds 1.65m, close the rinse water inlet control valve to stop replenishing water to the 5# rinse tank. S3 PLC follows the set 1# rinse tank conductivity control logic program: when the 2# rinse tank conductivity exceeds 260μs / cm or the 1# rinse tank liquid level exceeds 1.7m, the 1# tank emptying control valve opens and starts to drain the 1# rinse tank water; when the 1# rinse tank liquid level is lower than 1.3m, the 1# tank emptying control valve closes and stops draining the 1# rinse tank water. S4 PLC follows the set conductivity control logic program of 2# rinsing tank: when the conductivity of 5# rinsing tank exceeds 30μs / cm or the liquid level of 2# rinsing tank exceeds 1.8m, the 2# tank emptying control valve opens and starts to drain the 2# rinsing tank water; when the liquid level of 2# rinsing tank is lower than 1.3m, the 2# tank emptying control valve closes and stops draining the 2# rinsing tank water. S5 HIM rinse level warning: When the liquid level of a 1-5# rinse tank is lower than 1.3m or 1.65-1.9m, a yellow warning will be displayed; when it is 1.3-1.65m, a blue warning will be displayed; when it exceeds 1.9m or is lower than 0.9m, a red warning will be displayed. S6 HMI rinse spray pressure warning: When the spray pressure of a 1-5# rinse tank is lower than 0.15-0.2Mpa, a yellow warning will be displayed; 0.2-0.35Mpa will be displayed in blue; and when it exceeds 0.35Mpa or is lower than 0.15Mpa, a red warning will be displayed. S7 HIM rinse water quality warning: When the conductivity of a rinse in the 5# rinse tank is 1-160m, it will show blue, 160-260μs / cm will show yellow warning, and when it exceeds 260μs / cm or is lower than 1μs / cm, it will show red warning. When the conductivity of a rinse in the 2# rinse tank 2-6 is 1-20m, it will show blue, 20-30μs / cm will show yellow warning, and when it exceeds 30μs / cm or is lower than 1μs / cm, it will show red warning.

Images