Closed-loop control system and control method for differential pressure of box body of coating machine

Abstract

The invention relates to the technical field of coating machines, and discloses a closed-loop control system and method for the pressure difference of a box body of a coating machine, and the system comprises a pressure measurement module which comprises a pressure sensor, an analog quantity output assembly and a 458 communication assembly which are connected in sequence, and the pressure sensor is used for measuring the real-time data of pressure; the analog quantity output assembly is used for converting real-time pressure data into differential pressure analog quantity, and the 458 communication assembly is used for summarizing the differential pressure analog quantity; the PLC control module is connected with the 458 communication assembly and used for processing data summarization output by the 458 communication assembly; and the air volume adjusting module is connected with the PLC control module and is used for adjusting and controlling the air volume so as to stabilize the air pressure of the box body. The opening degree of the electric air valve of the box body is controlled by reading the numerical value of the differential pressure gauge of the box body, it is guaranteed that the air pressure value of the box body is stabilized within the set value range, the air valve does not need to be adjusted manually, and the adjusting efficiency and the adjusting accuracy are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of coating machines, and in particular relates to a box pressure difference closed-loop control system and a control method of a coating machine. Background Art

[0002] The coating machine is mainly used for the production of battery cell coating process with copper foil and aluminum foil as the substrate. This machine coats the rolled substrate with one or more layers of battery cell coating of a specific process, and forms the preliminary battery cell raw materials of power battery or energy storage battery after drying in an oven for subsequent production. Maintaining the pressure balance in the coating machine oven is a very important technology in the battery cell coating process, which involves the control of the flow direction and flow rate of the hot air inside the oven. The traditional debugging method is to manually adjust the opening of the box air valve according to the actual box pressure difference data to control the hot air flow inside the oven, and then adjust the box pressure. This way of controlling the air valve requires manual adjustment of each oven box air valve every time the product is changed, which leads to low efficiency, and because the air valve needs to be manually adjusted, the adjustment accuracy is also low. Summary of the invention

[0003] In order to address the deficiencies of the prior art, the present invention provides a closed-loop control system and control method for a coating machine's box pressure difference, which realizes automatic closed-loop adjustment of the oven box air pressure through a PLC control module, and uses a program to read the value of the box pressure difference gauge to control the opening of the box's electric air valve, thereby ensuring that the box air pressure value is stable within the set value range. There is no need to manually adjust the air valve, which effectively improves the degree of automation. Compared with manual operation, it effectively saves adjustment time, thereby improving the adjustment efficiency. Since it is controlled by an automatic system, there is no need to rely on manual experience, and the adjustment accuracy can be greatly improved.

[0004] The technical effects to be achieved by the present invention are achieved through the following aspects:

[0005] In a first aspect, the present invention provides a closed-loop pressure difference control system for a coating machine, comprising:

[0006] The pressure measurement module includes a pressure sensor, an analog output component and a 458 communication component connected in sequence, wherein the pressure sensor is used to measure real-time data of pressure, the analog output component is used to convert the real-time data of pressure into an analog quantity of a pressure difference value, and the 458 communication component is used to summarize the data of the analog quantity of the pressure difference value;

[0007] A PLC control module connected to the 458 communication component and processing the data output by the 458 communication component; and

[0008] The air volume regulating module is connected to the PLC control module, and is used to adjust the air volume to stabilize the air pressure in the box.

[0009] In some implementations, the air volume regulating module includes an air valve and a driving component, wherein the driving component is connected to the air valve to control the opening and closing degree of the air valve; and the PLC control module is connected to the driving component to control the operation mode of the driving component.

[0010] In a second aspect, the present invention provides a control method, using the above-mentioned box pressure difference closed-loop control system of the coating machine, the control method comprising the following steps:

[0011] S1, input set value;

[0012] S2, monitoring the pressure difference of the box air pressure; reading the actual value of the box air pressure through the pressure sensor, and comparing it with the set value to obtain the pressure difference;

[0013] S3, calculating the current air valve opening adjustment amount δOUT; inputting the pressure difference into the PLC control module to calculate the current air valve opening adjustment amount δOUT;

[0014] S4, calculate the planned adjustment amount OUT of the air valve;

[0015] S5, control the opening of the air valve; adjust the amount OUT according to the air valve plan, and control the air valve to open to a certain degree.

[0016] In some implementations, in S1, the set values ​​include the cabinet air pressure set value Sv, the start range e1 for opening the air volume adjustment, the adjustable range e2 of the air valve, the upper limit adjustment amount out1 of the air valve and the constant output amount out2 of the air valve.

[0017] In some implementations, in S2, the actual value Pv of the box air pressure is read by the pressure sensor. If |Pv-Sv|>e1 does not exist, S2 is repeated; if |Pv-Sv|>e1 exists, S3 is executed.

[0018] In some implementations, in S3, the pressure difference |Pv-Sv| in S2 is input into the PLC control module to calculate the current air valve opening adjustment amount δOUT; and the current air valve opening adjustment amount δOUT is compared with the adjustable range e2 of the air valve. If δOUT<e2 does not exist, δOUT=out1, and then S4 is executed; if δOUT<e2 exists, S4 is executed.

[0019] In some implementations, in S4, the planned air valve adjustment amount OUT is calculated according to the current air valve opening adjustment amount δOUT, OUT=out2+δOUT is obtained, and S5 is executed.

[0020] In some implementations, the set value also includes a deviation e3 between the planned air valve adjustment amount OUT and the actual air valve opening value P1.

[0021] In some implementations, the control method further includes, after S5:

[0022] S6, compare and monitor the planned adjustment amount OUT of the air valve and the actual opening value P1 of the air valve;

[0023] S7, error message; the planned air valve adjustment amount OUT is significantly different from the actual air valve opening value P1.

[0024] In some implementations, in S6, when |OUT-P1|>e3 exists, S7 is executed; when |OUT-P1|>e3 does not exist, the step returns to S2.

[0025] In summary, the present invention has at least the following benefits:

[0026] 1. The box pressure difference closed-loop control system provided by the present invention realizes automatic closed-loop regulation of the oven box air pressure through a PLC control module, and uses a program to read the value of the box pressure difference meter to control the opening of the air volume adjustment module, thereby ensuring that the box air pressure value is stable within the set value range. There is no need to manually adjust the air valve, which effectively improves the degree of automation. Compared with manual operation, it effectively saves adjustment time and thus improves the adjustment efficiency. Since it is controlled by an automatic system, there is no need to rely on manual experience, which can greatly improve the adjustment accuracy.

[0027] 2. The box pressure difference closed-loop control system provided by the present invention controls the air valve opening of the air volume regulating module by reading the pressure difference value, thereby ensuring stable wind direction and pressure balance without generating air turbulence, thereby ensuring good drying effect.

[0028] 3. The box pressure difference closed-loop control system provided by the present invention can save and call data through the PLC control module, thereby realizing rapid switching of multiple models. This design not only reduces the error rate, but also improves production efficiency, realizes rapid product changeover, and prevents problems such as production delays. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the framework of Example 1 of the present invention.

[0030] Figure 2 This is a flow chart of the control method in Example 2 of the present invention.

[0031] Figure 3 This is a logic diagram of the control method in Example 3 of the present invention.

[0032] Markings in the figure:

[0033] 11. Pressure sensor, 12. Analog output component, 13. 458 communication component; 2. PLC control module; 3. Air volume adjustment module. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, not all of them.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Embodiment 1:

[0037] Please see attached Figure 1 The present invention provides a closed-loop control system for a box pressure difference of a coating machine, comprising a pressure measuring module, a PLC control module 2 and an air volume regulating module 3; the pressure measuring module comprises a pressure sensor 11, an analog output component 12 and a 458 communication component 13 which are connected in sequence, the pressure sensor 11 is used to measure the real-time data of the pressure, the analog output component 12 is used to convert the real-time data of the pressure into an analog quantity of a pressure difference value, and the 458 communication component 13 is used to summarize the analog quantity of the pressure difference value; the PLC control module 2 is connected to the 458 communication component 13, and processes the data summary output by the 458 communication component 13; the air volume regulating module 3 is connected to the PLC control module 2, and the air volume regulating module 3 is used to adjust the air volume to stabilize the box air pressure.

[0038] The box pressure difference closed-loop control system in this embodiment operates as follows: first, the actual value of the box air pressure is read by the pressure sensor 11 in the pressure measurement module, and the pressure difference is obtained by comparing it with the set value through the analog output component 12; the analog value is then summarized through the 458 communication component 13; secondly, the summarized data is processed by the PLC control module 2, and finally the air volume is adjusted by controlling the air volume adjustment module 3, thereby realizing real-time monitoring of the box air pressure and effectively ensuring the stability of the box air pressure.

[0039] By setting up the analog quantity to 458 communication component 13 for data aggregation, the method of using the differential pressure meter 485 communication to connect multiple meters in parallel can be replaced, thereby avoiding the phenomenon that the shielded line of the 485 communication does not pass through multiple transfers and causes frequent communication interference, which will affect the effectiveness of the PLC reading data, and can effectively ensure the timeliness of the PLC control module 2 reading the differential pressure meter data.

[0040] In this control system, the PLC control module 2 is used to realize automatic closed-loop regulation of the oven box air pressure, and the program is used to read the value of the box pressure differential gauge to control the opening of the air volume adjustment module 3 to ensure that the box air pressure value is stable within the set value range. There is no need to manually adjust the air valve, which effectively improves the degree of automation. Compared with manual operation, it effectively saves adjustment time and thus improves the adjustment efficiency. Since it is controlled by an automatic system, there is no need to rely on manual experience, which can greatly improve the adjustment accuracy.

[0041] In addition, data can be saved and called through the PLC control module 2, so as to realize rapid switching of multiple models. This design not only reduces the error rate, but also improves production efficiency, realizes rapid product changeover, and can effectively prevent problems such as production delays.

[0042] Specifically, the air volume regulating module 3 includes an air valve and a driving component, the driving component is connected to the air valve to control the opening and closing degree of the air valve; the PLC control module 2 is connected to the driving component to control the operation mode of the driving component. Under this structure, by reading the pressure difference value, the PLC control module 2 controls the driving component to drive the air valve to open accordingly, thereby controlling the air valve opening of the air volume regulating module 3, and avoiding the air turbulence caused by manual fine-tuning, thereby ensuring the stability of wind direction and pressure balance, and preventing air turbulence, thereby ensuring a good drying effect.

[0043] Embodiment 2:

[0044] This embodiment is based on the above embodiment. Figure 2-Figure 3 , a control method is provided, using the above-mentioned box pressure difference closed-loop control system of the coating machine, the control method includes the following steps:

[0045] S1, input set value; specifically, the set value includes the box air pressure set value Sv, the start range of air volume adjustment e1, the adjustable range of the air valve e2, the upper limit adjustment of the air valve out1 and the constant output of the air valve out2. Among them, the adjustable range of the air valve e2 is an adjustable error value set according to the actual situation on site, which is used to prevent the equipment from outputting too large an offset, prevent the calculation data from abnormally obtaining a large air valve opening adjustment, and avoid the phenomenon of unstable control caused by a large change in the electric air valve.

[0046] S2, monitor the pressure difference of the box air pressure; read the actual value of the box air pressure through the pressure sensor 11, and compare it with the set value to obtain the pressure difference; read the actual value of the box air pressure Pv through the pressure sensor 11, if Pv-Sv|>e1 does not exist, repeat S2; if |Pv-Sv|>e1 exists, execute S3.

[0047] S3, calculate the current air valve opening adjustment amount δOUT; input the pressure difference into PLC control module 2 to calculate the current air valve opening adjustment amount δOUT; input the pressure difference |Pv-Sv| in S2 into PLC control module 2 to calculate the current air valve opening adjustment amount δOUT; and compare the current air valve opening adjustment amount δOUT with the adjustable range e2 of the air valve. If δOUT<e2 does not exist, set δOUT=out1 and execute S4; if δOUT<e2 exists, execute S4.

[0048] In this step, when the air valve opening adjustment amount δOUT is not less than the adjustable range e2 of the air valve, the air valve opening adjustment amount δOUT is directly set to the air valve upper limit adjustment amount out1, which can effectively avoid over-adjustment during the equipment adjustment process and ensure the stability of the air valve control.

[0049] S4, calculate the planned adjustment amount OUT of the air valve; calculate the planned adjustment amount OUT of the air valve according to the current air valve opening adjustment amount δOUT, obtain OUT=out2+δOUT, and execute S5. Specifically, the constant output amount out2 of the air valve needs to be continuously output for opening the electric air valve. If out2 is 0, the air valve is closed.

[0050] S5, control the opening of the air valve; adjust the amount OUT according to the air valve plan, and control the air valve to open to a certain degree.

[0051] The control method in this embodiment can realize automatic closed-loop regulation of the air pressure of the oven body, use the program to read the value of the pressure differential gauge of the box body, and control the opening of the electric air valve of the box body to ensure that the air pressure value of the box body is stable within the set value range, and achieve the effect of real-time monitoring. There is no need to manually adjust the air valve, which effectively improves the degree of automation. Compared with manual operation, it effectively saves adjustment time and improves the adjustment efficiency. Because it is controlled by the automatic system, it does not need to be based on manual experience, and the adjustment accuracy can be greatly improved. This method of controlling the air valve can automatically control the air valve opening of the air volume adjustment module 3, avoid air turbulence caused by manual fine-tuning, thereby ensuring stable wind direction, balanced pressure, and no air turbulence, thereby ensuring good drying effect.

[0052] In addition, data can be saved and called through the PLC control module 2, so as to realize rapid switching of multiple models. This design not only reduces the error rate, but also improves production efficiency, realizes rapid product changeover, and prevents problems such as production delays.

[0053] Embodiment 3:

[0054] The difference between this embodiment and embodiment 2 is that, see Figure 3 The set value in this embodiment also includes the deviation e3 between the planned air valve adjustment amount OUT and the actual air valve opening value P1.

[0055] In some embodiments, the control method further includes after S5:

[0056] S6, compare and monitor the planned adjustment amount OUT of the air valve with the actual opening value P1 of the air valve; when |OUT-P1|>e3 exists, execute S7; when |OUT-P1|>e3 does not exist, the step returns to S2.

[0057] S7, error message; the planned air valve adjustment amount OUT is significantly different from the actual air valve opening value P1.

[0058] The control method in this embodiment is configured to compare and monitor the planned adjustment amount OUT of the air valve and the actual opening value P1 of the air valve. When the deviation between the two is too large, an alarm will be issued to remind the operator to check the air valve, thereby effectively ensuring the stability of the air pressure and making maintenance clear and simple.

[0059] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0061] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0062] In the present invention, unless otherwise clearly specified and limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being above, above, and above a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below a second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0063] Although the present invention is described in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes according to the above content. Therefore, all such substitutions, improvements and changes are included in the spirit and scope of the appended claims.

Claims

1. A closed-loop pressure difference control system for a coating machine, characterized in that: include The pressure measurement module includes a pressure sensor, an analog output component and a 458 communication component connected in sequence, wherein the pressure sensor is used to measure the real-time data of the pressure, the analog output component is used to convert the real-time data of the pressure into an analog quantity of a pressure difference value, and the 458 communication component is used to summarize the data of the analog quantity of the pressure difference value; A PLC control module is connected to the 458 communication component and processes the data output by the 458 communication component; as well as The air volume regulating module is connected to the PLC control module, and is used to adjust the air volume to stabilize the air pressure in the box.

2. The chamber pressure difference closed-loop control system of the coating machine according to claim 1, characterized in that: The air volume regulating module includes an air valve and a driving component, wherein the driving component is connected to the air valve to control the opening and closing degree of the air valve; the PLC control module is connected to the driving component to control the operation mode of the driving component.

3. A control method, characterized in that: The box pressure difference closed-loop control system of the coating machine according to any one of claims 1 to 2 is adopted, and the control method The following steps are involved: S1, input set value; S2, monitoring the pressure difference of the box air pressure; reading the actual value of the box air pressure through the pressure sensor, and comparing it with the set value to obtain the pressure difference; S3, calculating the current air valve opening adjustment amount δOUT; inputting the pressure difference into the PLC control module to calculate the current air valve opening adjustment amount δOUT; S4, calculate the planned adjustment amount OUT of the air valve; S5, control the opening of the air valve; adjust the amount OUT according to the air valve plan, and control the air valve to open to a certain degree.

4. The control method according to claim 3, characterized in that: In S1, the set values ​​include the box air pressure set value Sv, the start range e1 of the air volume adjustment, the adjustable range e2 of the air valve, the upper limit adjustment amount out1 of the air valve and the constant output amount out2 of the air valve.

5. The control method according to claim 4, characterized in that: In S2, the actual value Pv of the box air pressure is read by the pressure sensor. If |Pv-Sv|>e1 does not exist, S2 is repeated; if Pv-Sv|>e1 exists, S3 is executed.

6. The control method according to claim 5, characterized in that: In S3, the pressure difference |Pv-Sv| in S2 is input into the PLC control module to calculate the current air valve opening adjustment amount δOUT; and the current air valve opening adjustment amount δOUT is compared with the adjustable range e2 of the air valve. If δOUT<e2 does not exist, δOUT=out1 and then execute S4; if δOUT<e2 exists, execute S4.

7. The control method according to claim 6, characterized in that: In S4, the planned air valve adjustment amount OUT is calculated according to the current air valve opening adjustment amount δOUT, and OUT=out2+δOUT is obtained, and S5 is executed.

8. The control method according to claim 4, characterized in that: The set value also includes a deviation e3 between the planned air valve adjustment amount OUT and the actual air valve opening value P1.

9. The control method according to claim 8, characterized in that: The control method further comprises after S5: S6, compare and monitor the planned adjustment amount OUT of the air valve and the actual opening value P1 of the air valve; S7, error message; the planned air valve adjustment amount OUT is significantly different from the actual air valve opening value P1.

10. The control method according to claim 9, characterized in that: In S6, when |OUT-P1|>e3 exists, S7 is executed; when |OUT-P1|>e3 does not exist, the step returns to S2.

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