Vertical stirring electrical control system applied to platinum channel

Abstract

The invention discloses a vertical stirring electrical control system applied to a platinum channel, and relates to the technical field of glass production and processing control, the vertical stirring electrical control system comprises a DCS system, a PLC control system, a rotary stirring system and a vertical lifting system, and the rotary stirring system comprises a stirring assembly and a data processing module. The range value of the theoretical stirring speed omega0 of the stirring assembly and the safe torque Ts capable of being borne by the stirring assembly are set through the numerical value presetting module, the viscosity numerical value mu of the molten glass is collected, then the torque Tc is measured and calculated, the measured and calculated torque Tc is compared with the safe torque Ts, and the viscosity value mu of the molten glass is calculated. And outputting a specific numerical value of the determined theoretical stirring rate omega0 based on a comparison result, so that the actual stirring rate omegae of the stirring assembly is automatically and accurately regulated and controlled through PID based on the specific numerical value of the theoretical stirring rate omega0.

Description

Technical Field

[0001] The invention relates to the technical field of electrical control for glass production and processing, and in particular to an electrical control system for vertical stirring of a platinum channel. Background Art

[0002] With the rapid development of flat panel display technology in recent years, the demand for ultra-thin glass for information display is increasing day by day. Electronic glass substrates and cover plates are key materials in the optoelectronic display industry. The most common methods for producing TFT substrate glass are overflow down-pull method and float method. In both common methods, the molten glass liquid needs to be vertically stirred and clarified, and then overflowed through a platinum channel or float process to form the required substrate glass. Therefore, controlling the precise operation of the vertical stirring barrel is a key step that affects the quality of the glass liquid.

[0003] The vertical stirring equipment used in the existing glass liquid processing process generally includes a stirring element, a stirring motor, and a lifting drive element. During the control process, the torque sensor and the speed sensor are used to detect the speed of the stirring component and the torque it is subjected to during the stirring process. When the stirring component is subjected to excessive torque due to excessive viscosity of the glass liquid, an alarm is issued, and then the operator adjusts and controls the rotation speed of the stirring component through the PLC control system to reduce the influence of the torque on the stirring component.

[0004] The shortcomings of the electrical control system for controlling the glass liquid vertical stirring equipment in the prior art are: although the vertical stirring equipment in the prior art can monitor the torque and speed and other parameters of the stirring component through sensor elements such as torque sensors and speed sensors, and adjust the speed of the stirring component according to the monitored data, the prior art requires manual re-entry of a new speed value based on personal experience when making adjustments, and then observe whether the torque value collected by the sensor reaches a safe value. If not, it is necessary to continue to try to enter a new value, which requires multiple speed adjustments. It is difficult to maintain the accuracy of the adjusted input speed value, which may be too low to affect the glass liquid stirring effect, thereby affecting the product quality, and the operation control process is cumbersome and not convenient enough, that is, it is not convenient to automatically and accurately adjust the stirring speed of the stirring component according to the actual viscosity of the glass liquid during the control process of the existing glass liquid vertical stirring equipment, thereby affecting the glass production and processing quality. Summary of the invention

[0005] The purpose of the present invention is to provide an electrical control system for vertical stirring of a platinum channel, so as to solve the technical problem in the prior art that it is not convenient to automatically and accurately adjust the rotation speed of the stirring element according to the actual viscosity of the glass liquid during the control process of the glass liquid vertical stirring equipment, thereby affecting the quality of glass production and processing.

[0006] The technical problem to be solved by the present invention can be achieved by the following technical solutions:

[0007] A vertical stirring electrical control system for a platinum channel, comprising a DCS system and a PLC control system, wherein the PLC control system comprises a data acquisition module for collecting operating data of a vertical stirring device, and further comprises:

[0008] A rotary stirring system, the rotary stirring system comprising a stirring component and a data processing module, the data processing module being used to calculate a theoretical stirring rate ω0 of the stirring component; and controlling and adjusting an actual stirring rate ω0 of the stirring component based on the calculated theoretical stirring rate ω0. e ;

[0009] A vertical lifting system, the vertical lifting system includes a lifting motor for driving the stirring component to lift and lower, and a travel switch for locating the position of the stirring component. The data acquisition module collects the position information of the travel switch; and controls the forward and reverse switching of the lifting motor based on the position information.

[0010] As a further solution of the present invention: the data processing module includes a numerical preset module and a torque calculation module, wherein the numerical preset module is used to preset the range value of the theoretical stirring rate ω0 of the stirring component and the safety torque T s The torque calculation module calculates the measured torque T that the stirring component must withstand when stirring the current glass liquid based on the collected glass liquid viscosity value μ and the range value of the theoretical stirring rate ω0 c , and the torque T c With safety torque T s The comparison is performed and the comparison result is output; the PLC control system adjusts and sets the actual stirring rate ω of the stirring component based on the output comparison result e ; Among them, the glass liquid viscosity value μ is detected by the data acquisition module.

[0011] As a further solution of the present invention: the calculated torque T that the stirring component must bear when stirring the current glass liquid c The calculation formula is:

[0012] T c = k·μ·ω·f(R,r,h)

[0013] Among them, k is the proportional coefficient, R is the radius of the stirring component; r is the axis radius of the stirring component; h is the depth of the glass liquid; μ is the viscosity value; ω is the stirring rate; f(R, r, h) is a function that depends on R, r, and h.

[0014] As a further solution of the present invention: the torque calculation module takes a continuous arithmetic progression of the range value of the theoretical stirring rate ω0 according to the arithmetic progression of 0.01, and substitutes each value in the arithmetic progression from large to small into the measured torque T c The calculation formula of T is used as the value of ω. c , the T calculated each time c With safety torque T s For comparison, if T c Greater than T s , then substitute the next value to continue the calculation; if T c Less than T s , then stop the calculation and output the ω0 used in the current calculation;

[0015] The PLC control system adjusts the output ω0 value to the actual stirring rate ω of the stirring component. e .

[0016] As a further solution of the present invention: the rotary stirring system further includes a rotary frequency converter, the stirring assembly includes a stirring motor, and the main shaft speed of the stirring motor is controlled by the rotary frequency converter.

[0017] As a further solution of the present invention: the rotary frequency converter includes a PID controller, the PLC control system sets the ω0 value output by the torque calculation module as the set value of the PID controller, and the PID controller adjusts the output of the rotary frequency converter according to the error between the actual speed value of the stirring component and the set value, and adjusts the actual stirring speed ω of the stirring component. e Adjustment control.

[0018] As a further solution of the present invention: the vertical lifting system includes a lifting rod for driving the stirring assembly to move up and down, and the travel switch is provided in two groups and is distributed on the upper and lower sides of the lifting rod.

[0019] As a further solution of the present invention: the electrical system also includes a touch control screen, which displays a virtual button for controlling the lifting and deceleration speed a of the vertical lifting system; the PLC control system also includes a touch recognition module and a timing module, and the touch recognition module determines whether the virtual button is touched based on the pressure sensing of the area where the virtual button is located; if so, the timing module is started to output the touch time t, and the lifting and deceleration speed a of the vertical lifting system is calculated based on the touch time t; if not, the original lifting speed of the vertical lifting system is maintained.

[0020] As a further solution of the present invention: the calculation formula for calculating the lifting acceleration and deceleration a of the vertical lifting system based on the touch time t is:

[0021] a=X·t

[0022] Among them, X is the positive proportionality coefficient.

[0023] As a further solution of the present invention: the touch control screen also displays an emergency stop virtual button for cutting off the power supply of the vertical stirring equipment.

[0024] Beneficial effects of the present invention:

[0025] 1. The present invention sets the range of the theoretical stirring rate ω0 of the stirring component and the safe torque T that the stirring component can withstand through the numerical preset module. s , and collect the viscosity value μ of the glass liquid, and then use the torque calculation module to calculate the calculated torque T that the stirring component must withstand when stirring the current glass liquid based on the collected viscosity value μ of the glass liquid and the range value of the theoretical stirring rate ω0. c , and the torque T c With safety torque T s By comparison, the measured torque T c Less than safety torque T s The specific value of the theoretical stirring rate ω0 is outputted as the result, so that the actual stirring rate ω0 of the stirring component is automatically and accurately controlled by PID based on the specific value of the theoretical stirring rate ω0. e , ensuring that the stirring component stirs at the maximum stirring rate as much as possible under safe torque conditions, thereby ensuring stirring efficiency while reducing the impact of torque on the service life of the stirring component.

[0026] 2. The PLC control system of the present invention collects and reads the data of the travel switch provided on the stirring component, determines the position information of the stirring component during the lifting and lowering movement, thereby controlling and adjusting the lifting and lowering movement, and when manual fine-tuning of the lifting speed is required, the lifting and lowering acceleration and deceleration speed of the vertical lifting system can be controlled by controlling the length of time of touching the virtual button on the touch control screen. The longer the touch time, the greater the acceleration and deceleration speed, and the shorter the touch time, the smaller the acceleration and deceleration speed. This can avoid sudden acceleration when fine-tuning the lifting speed during the glass liquid stirring work, resulting in too fast or too slow lifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] Figure 1 The present invention is a schematic diagram of the composition of an electrical control system for vertical stirring of a platinum channel. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0030] like Figure 1 As shown, a vertical stirring electrical control system applied to a platinum channel is used to control the vertical stirring equipment for stirring the glass liquid in the process of glass production and processing. The system includes a DCS system, a PLC control system, a rotary stirring system and a vertical lifting system. The DCS system is a distributed control system, which is a system used for industrial automation control. The PLC control system is a programmable logic controller control system; wherein, the PLC control system includes a data acquisition module, which is used to collect process data such as real-time voltage, current, stirring speed and vertical motion position information of the vertical stirring equipment and equipment fault alarm code. The PLC control system collects process data through the data acquisition module and transmits it to the DCS system in the central control room using industrial Ethernet profinet communication; it is convenient for real-time monitoring, and there is no need for on-site dedicated personnel to be on duty for monitoring, thereby improving safety, reliability and intelligence.

[0031] The rotary stirring system includes a stirring component and a data processing module. The stirring component is arranged in a stirring barrel for stirring the glass liquid, and the stirring barrel is made of platinum. The data processing module is used to calculate the theoretical stirring rate ω0 of the stirring component, and control and adjust the actual stirring rate ω0 of the stirring component based on the calculated theoretical stirring rate ω0 through a PLC control system. e ;

[0032] The data processing module includes a numerical preset module and a torque calculation module. The numerical preset module is used to preset the range value of the theoretical stirring rate ω0 of the stirring component and the safe torque T that the stirring component can withstand. s The range of the theoretical stirring rate ω0 is set to 5-20 revolutions per minute. Stirring the glass liquid within this range can ensure the stirring quality and avoid producing unqualified glass liquid products. The safety torque T s The value is the torque safety value that the stirring component in the vertical stirring device can withstand, and the specific value can be determined according to the model and specifications of the stirring component used; the rotary stirring system also includes a viscometer for detecting the viscosity value μ of the glass liquid. Here, the viscometer is a high-temperature resistant rotary viscometer. The PLC control system collects the viscosity value μ of the glass liquid detected by the viscometer through the data acquisition module. The torque calculation module calculates the calculated torque T that the stirring component has to withstand when stirring the current glass liquid based on the collected viscosity value μ of the glass liquid and the range value of the theoretical stirring rate ω0. c, and the torque T c With safety torque T s The comparison is performed and the comparison result is output; the PLC control system adjusts the actual stirring rate of the stirring component based on the output comparison result ω e , ensuring that the stirring component stirs at the maximum stirring rate as much as possible under safe torque conditions, thereby ensuring stirring efficiency while reducing the impact on the service life of the stirring component.

[0033] It should be noted that the torque calculation module calculates the calculated torque T that the stirring assembly has to bear when stirring the current glass liquid based on the collected glass liquid viscosity value μ and the range value of the theoretical stirring rate ω0. c The calculation formula is:

[0034] T c = k·μ·ω·f(R,r,h)

[0035] Among them, k is the proportional coefficient, R is the radius of the stirring component; r is the axis radius of the stirring component; h is the depth of the glass liquid; μ is the viscosity value; ω is the stirring rate; f(R, r, h) is a function that depends on R, r, and h. Of course, the function f here can also add other related factors.

[0036] The torque calculation module takes a continuous arithmetic sequence of the range value of the theoretical stirring rate ω0 according to the arithmetic difference of 0.01, and sorts them from large to small. For example, if the range value of the theoretical stirring rate ω0 is 5-20r / min, the arithmetic sequence is 20, 19.99, 19.98...5.01, 5, and each value in the arithmetic sequence is substituted from large to small into the measured torque T c The calculation formula of T is used as the value of ω. c It should be noted here that since k, μ, R, r, and h are all constants, T can be directly calculated. c , the T calculated each time c With safety torque T s For comparison, if T c Greater than T s , then substitute the next value to continue the calculation; if T c Less than T s , the calculation is stopped and the ω0 used in the current calculation is output.

[0037] The PLC control system sets the output ω0 value as the actual stirring rate ω of the stirring component. e This ensures stirring efficiency and reduces the impact of torque on the service life of the stirring component.

[0038] It should be noted that if all the ω0 values ​​are substituted into the calculation formula, the T cBoth are greater than T s , indicating that the current stirring component is not suitable for the glass liquid to be stirred, and can remind manual replacement of the stirring component specifications.

[0039] The vertical lifting system includes a lifting motor for driving the stirring component to lift and lower, and a travel switch for locating the stirring component. The data acquisition module collects the position information of the travel switch, and the PLC control system controls the forward and reverse switching of the lifting motor based on the position information.

[0040] In some specific embodiments, the rotary stirring system further comprises a rotary frequency converter, the stirring assembly comprises a stirring motor, and the rotary frequency converter controls the main shaft speed of the stirring motor, thereby achieving the actual stirring rate ω e control.

[0041] In other specific embodiments, the rotary frequency converter includes a PID controller, which is a feedback control algorithm that performs proportional, integral and differential operations according to an error signal to adjust the control amount so that the output of the system is as close to a set value as possible; the PLC control system sets the ω0 value output by the torque calculation module as the set value of the PID controller, and the PID controller adjusts the output of the rotary frequency converter according to the error between the actual speed value of the stirring component and the set value, and adjusts the actual stirring speed ω of the stirring component. e Precisely adjustable control.

[0042] In some specific embodiments, the vertical lifting system includes a lifting rod for driving the stirring component to lift and lower. There are two groups of travel switches, which are distributed on the upper and lower sides of the lifting rod. The specific connection relationship between the lifting motor and the lifting rod can be: a guide sleeve is set on the top of the stirring barrel, the lifting rod slides vertically through the guide sleeve, the top of the lifting rod is connected to the rack, the lifting motor can be fixed relative to the stirring barrel through the motor seat, the lifting motor includes a gear fixedly set at the end of the main shaft, the gear is meshed with the rack, the lifting motor relies on the driving gear to rotate, so that the gear drives the rack to move longitudinally, thereby realizing the up and down movement of the lifting rod, and the stirring component moves up and down accordingly. Of course, the lifting motor driving the lifting rod to move up and down in the present application is not limited to the above-mentioned technical means, and other technical means that can realize the lifting function can also be used.

[0043] In some specific implementation schemes, in order to facilitate manual fine-tuning of the lifting speed, the electrical system also includes a touch control screen, which displays a virtual button for controlling the lifting acceleration and deceleration a of the vertical lifting system; it should be noted that the lifting acceleration and deceleration a includes acceleration and deceleration, and the virtual button is divided into two buttons, which control acceleration and deceleration respectively; the PLC control system also includes a touch recognition module and a timing module, and the touch recognition module determines whether the virtual button is touched based on the pressure sensing of the area where the virtual button is located. If so, the timing module is started to output the touch time t, and the lifting acceleration and deceleration a of the vertical lifting system is calculated based on the touch time t, and the longer the touch time, the greater the lifting acceleration and deceleration a, and the shorter the touch time, the smaller the lifting acceleration and deceleration a, thereby facilitating precise fine-tuning of the lifting speed; otherwise, the original lifting speed of the vertical lifting system is maintained.

[0044] The calculation formula for calculating the lifting acceleration and deceleration a of the vertical lifting system based on the touch time t is:

[0045] a=X·t

[0046] Among them, X is the positive proportionality coefficient.

[0047] In other specific embodiments, an emergency stop virtual button is also displayed on the touch control screen, and the emergency stop virtual button is used to cut off the power supply of the vertical stirring equipment to prevent accidents.

[0048] In order to facilitate the understanding of the embodiments of this solution by those skilled in the art, the working principle of this solution is briefly described in combination with specific application scenarios:

[0049] When the vertical stirring device starts to vertically stir the glass liquid, the range of the stirring rate ω of the stirring component and the safe torque T that the stirring component can withstand are preset in advance. s .

[0050] Then, the PLC control system collects the real-time voltage, current, stirring speed, vertical movement position information, equipment fault alarm code and other process data of the vertical stirring equipment through the data acquisition module, and transmits them to the DCS system in the central control room using industrial Ethernet profinet communication to facilitate real-time monitoring.

[0051] The PLC control system also collects the glass liquid viscosity value μ detected by the viscometer through the data acquisition module, and then calculates the calculated torque T that the stirring component has to withstand when stirring the current glass liquid based on the collected glass liquid viscosity value μ and the range value of the theoretical stirring rate ω0 through the torque calculation module. c , and the torque T c With safety torque T s Perform comparison and output the comparison result;

[0052] During the calculation process, the torque calculation module continuously takes multiple values ​​of the range of the theoretical stirring rate ω0 as integers, sorts them from large to small, and substitutes them into the measured torque T one by one. c The calculation formula of T is used as the value of ω. c , the T calculated each time c With safety torque T s For comparison, if T c Greater than T s , then substitute the next value to continue the calculation; if T c Less than T s , the calculation stops and the value of ω0 currently substituted into the calculation is output.

[0053] Then the PLC control system adjusts the actual stirring rate ω of the stirring component based on the output ω0 value e , which can ensure the stirring efficiency and reduce the influence of torque on the service life of the stirring component;

[0054] The PLC control system sets the ω0 value output by the torque calculation module as the set value of the PID controller. The PID controller adjusts the output of the rotary frequency converter according to the error between the actual speed value of the stirring component and the set value, and adjusts the actual stirring speed ω of the stirring component. e Precisely adjustable control.

[0055] The PLC control system also collects the position information of the travel switch used to locate the vertical position of the stirring component through the data acquisition module, and controls the forward and reverse switching of the lifting motor based on the position information, thereby realizing vertical lifting control.

[0056] Several embodiments of the present invention are described in detail above, but the embodiments of the present invention are not limited thereto and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A vertical stirring electrical control system for a platinum channel, comprising a DCS system and a PLC control system, wherein the PLC control system comprises a data acquisition module for collecting operating data of a vertical stirring device; characterized in that: Also includes: A rotary stirring system, the rotary stirring system comprising a stirring component and a data processing module, the data processing module being used to calculate a theoretical stirring rate ω0 of the stirring component; and controlling and adjusting an actual stirring rate ω0 of the stirring component based on the calculated theoretical stirring rate ω0. e ; A vertical lifting system, wherein the vertical lifting system comprises a lifting motor for driving the stirring component to lift and lower, and a travel switch for locating the position of the stirring component, and the data acquisition module acquires position information of the travel switch; The forward and reverse switching of the lifting motor is controlled based on the position information.

2. The electrical control system for vertical stirring of a platinum channel according to claim 1, characterized in that: The data processing module includes a numerical value preset module and a torque calculation module; The numerical preset module is used to preset the range value of the theoretical stirring rate ω0 of the stirring component and the safety torque T s ; The torque calculation module calculates the calculated torque T that the stirring component must bear when stirring the current glass liquid based on the collected glass liquid viscosity value μ and the range value of the theoretical stirring rate ω0. c , and the torque T c With safety torque T s Perform comparison and output the comparison result; The PLC control system adjusts and sets the actual stirring rate ω of the stirring component based on the output comparison result e ; Among them, the glass liquid viscosity value μ is detected by the data acquisition module.

3. The electrical control system for vertical stirring of a platinum channel according to claim 2, characterized in that: The calculated torque T that the stirring component must withstand when stirring the current glass liquid c The calculation formula is: T c =k·μ·ω·f(R,r,h) Among them, k is the proportional coefficient; μ is the viscosity value; ω is the stirring rate; R is the radius of the stirring component; r is the axis radius of the stirring component; h is the depth of the glass liquid; f(R, r, h) is a function that depends on R, r, and h.

4. The electrical control system for vertical stirring of a platinum channel according to claim 2, characterized in that: The torque calculation module takes an arithmetic sequence of the range value of the theoretical stirring rate ω0 according to the arithmetic difference of 0.01, and substitutes each value in the arithmetic sequence from large to small into the measured torque T c The calculation formula of T is used as the value of ω. c ; Each time the calculated T c With safety torque T s Compare; if T c Greater than T s , then substitute the next value to continue the calculation; if T c Less than T s , then stop the calculation and output the ω0 used in the current calculation; The PLC control system adjusts the output ω0 value to the actual stirring rate ω of the stirring component. e .

5. The electrical control system for vertical stirring of a platinum channel according to claim 1, characterized in that: The rotary stirring system further comprises a rotary frequency converter, the stirring assembly comprises a stirring motor, and the main shaft speed of the stirring motor is controlled by the rotary frequency converter.

6. The electrical control system for vertical stirring of a platinum channel according to claim 5, characterized in that: The rotary frequency converter includes a PID controller. The PLC control system sets the ω0 value output by the torque calculation module as the set value of the PID controller. The PID controller adjusts the output of the rotary frequency converter according to the error between the actual rotation speed value of the stirring component and the set value, and adjusts the actual stirring speed ω of the stirring component. e Adjustment control.

7. The electrical control system for vertical stirring of a platinum channel according to claim 1, characterized in that: The vertical lifting system includes a lifting rod for driving the stirring assembly to move up and down. The travel switches are provided in two groups and are distributed on the upper and lower sides of the lifting rod.

8. The electrical control system for vertical stirring of a platinum channel according to claim 1, characterized in that: It also includes a touch control screen, which displays virtual buttons for controlling the lifting acceleration and deceleration speed a of the vertical lifting system; the PLC control system also includes a touch recognition module and a timing module; The touch recognition module determines whether the virtual button is touched based on the pressure sensing of the area where the virtual button is located; if yes, the timing module is started to output the touch time t, and the lifting acceleration a of the vertical lifting system is calculated based on the touch time t; if no, the original lifting speed of the vertical lifting system is maintained.

9. The electrical control system for vertical stirring of a platinum channel according to claim 8, characterized in that: The calculation formula for calculating the lifting acceleration and deceleration a of the vertical lifting system based on the touch time t is: a=X·t Among them, X is the positive proportionality coefficient.

10. The electrical control system for vertical stirring of a platinum channel according to claim 8, characterized in that: The touch control screen also displays an emergency stop virtual button for cutting off the power supply of the vertical stirring device.

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