A roll stand speed following control method and system

Abstract

The application discloses a kind of roller table speed following control method and system, and roller table is connected with downstream equipment, and at least installation has centering mechanism and fan on roller table, wherein the method includes: PLC controller obtains the first speed after downstream equipment is adjusted according to kiln firing cycle adjustment operation, then the first target speed of roller table is generated in combination with first proportion formula, and the actual speed of roller table is adjusted again in closed loop;PLC controller generates the second target speed of the fan according to second proportion formula and first speed, and the actual speed of fan is adjusted again in closed loop;PLC controller generates the third target speed of centering mechanism according to third proportion formula and the actual speed of roller table, and the actual speed of centering mechanism is adjusted again in closed loop when it is put into use.The application can intelligently adjust the running speed of roller table by PLC controller to adapt to kiln transmission speed, and the running state of fan and centering mechanism is adjusted synchronously, and equipment utilization is improved.

Description

Technical Field

[0001] This invention relates to the field of kiln front roller table control technology, specifically to a roller table speed following control method and system. Background Technology

[0002] In the production process of ceramic tile products, adjustments such as changing production lines, increasing production, or decreasing production are frequently involved. This requires the kiln firing cycle to change irregularly, which in turn leads to constant changes in the kiln drive speed. As the docking device for the kiln drive, the roller table also needs to constantly adjust its operating speed to adapt to the kiln drive speed. Currently, whenever the kiln firing cycle changes, the operating speed of the roller table still needs to be manually adjusted on the PLC controller, which is time-consuming, labor-intensive, and lacks intelligent control. Summary of the Invention

[0003] This invention provides a roller table speed following control method and system to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0004] Firstly, a method for controlling the speed of a roller table is provided. The roller table is a loader installed at the front end of a kiln. The roller table is divided into five transmission sections according to the transmission sequence and is defined as D1, D2, D3, D4, and D5. Each of the five transmission sections is equipped with a first motor assembly. Transmission section D2 is equipped with a photoelectric switch. A centering mechanism and a second motor assembly connected to it are installed between transmission sections D3 and D4. Transmission section D5 is equipped with a fan and a third motor assembly connected to it. Transmission section D5 is connected to downstream equipment. The five first motor assemblies, the second motor assemblies, the third motor assembly, and the photoelectric switch are connected to a PLC controller. The method includes:

[0005] The PLC controller obtains the first speed of the downstream equipment after adjusting its operation according to the kiln firing cycle, generates the first target speed of the roller table by combining it with the first proportional formula, and then performs closed-loop adjustment on the actual speed of the roller table.

[0006] The PLC controller generates the second target speed of the fan according to the second proportional formula and the first speed, and then performs closed-loop adjustment of the actual speed of the fan;

[0007] The PLC controller generates the third target speed of the centering mechanism based on the third proportional formula and the actual speed of the roller table, and then performs closed-loop adjustment of its actual speed when the centering mechanism is put into use.

[0008] Furthermore, the expression for the first proportional formula is: First target speed = First speed × First proportional coefficient ± Actual speed of the roller table, wherein the first proportional coefficient is a set value.

[0009] Furthermore, closed-loop adjustment of the actual speed of the roller table includes:

[0010] The five first motor components are controlled to adjust the running state of the roller table according to the first target speed. The actual speed of the roller table is then acquired in real time and the difference between it and the first target speed is transmitted to the first PID controller for parsing to obtain the first drive signal. The five first motor components are then controlled to readjust the running state of the roller table according to the first drive signal.

[0011] Furthermore, the expression for the second proportional formula is: Second target speed = First speed × Second proportional coefficient ± Current speed of the fan, wherein the second proportional coefficient is a set value.

[0012] Furthermore, the closed-loop adjustment of the actual speed of the fan includes:

[0013] The third motor assembly is controlled to adjust the operating state of the fan according to the second target speed. The actual speed of the fan is then acquired in real time and the difference between the actual speed and the second target speed is transmitted to the second PID controller for analysis to obtain the second drive signal. The third motor assembly is then controlled to readjust the operating state of the fan according to the second drive signal.

[0014] Furthermore, the expression for the third proportional formula is: Third target speed = Actual speed of the roller table × Third proportional coefficient × Pulse frequency, wherein the third proportional coefficient and the pulse frequency are both set values.

[0015] Furthermore, when the ceramic tile product just leaves the transmission section D2, the PLC controller controls the centering mechanism to start operation, and throughout the operation, it manages the operating status of the transmission sections D1 and D2 based on the current detection status of the photoelectric switch.

[0016] Furthermore, the closed-loop adjustment of the actual speed of the centering mechanism includes:

[0017] The second motor assembly is controlled to adjust the operating state of the centering mechanism according to the third target speed. The actual speed of the centering mechanism is then acquired in real time, and the difference between the actual speed and the third target speed is transmitted to the third PID controller for analysis to obtain the third drive signal. The second motor assembly is then controlled to readjust the operating state of the centering mechanism according to the third drive signal.

[0018] Furthermore, transmission sections D3, D4, and D5 are configured as an end-effector group. When the photoelectric switch does not detect any tile products within a specified time and the end-effector group is not transporting any tile products, the PLC controller controls the fan and the end-effector group to stop operating. Alternatively, when the photoelectric switch does not detect any tile products within a specified time and the end-effector group is transporting tile products, the PLC controller controls the fan and the end-effector group to stop operating at a specified time point, and at the specified time point, the end-effector group has already transported the tile products out.

[0019] Secondly, a roller table speed following control system is provided, including a PLC controller, a roller table, a centering mechanism, a fan, and a photoelectric switch. The roller table is a loader installed at the front end of the kiln. The roller table is divided into five transmission sections according to the transmission sequence and is defined as D1, D2, D3, D4, and D5 respectively. Transmission section D5 is connected to downstream equipment. The centering mechanism is installed between transmission sections D3 and D4. The fan is installed in transmission section D5. The photoelectric switch is installed in transmission section D2. Five first motor assemblies are installed in the five transmission sections respectively. The centering mechanism is equipped with a second motor assembly. The fan is equipped with a third motor assembly. The five first motor assemblies, the second motor assembly, the third motor assembly, and the photoelectric switch are connected to the PLC controller. The PLC controller is configured to execute the roller table speed following control method as described in the first aspect.

[0020] The present invention has at least the following beneficial effects: by referring to the downstream equipment to adjust the speed after operation according to the kiln firing cycle, the PLC controller is used to adjust the running speed of the roller table to adapt to the kiln transmission speed. At the same time, the operating status of the centering mechanism and the fan installed on the roller table is adjusted synchronously to improve the equipment utilization rate. Furthermore, when the photoelectric switch detects that there are no ceramic tile products being transported on the roller table, the fan and the transmission section of the roller table near the kiln are automatically controlled to stop operating to effectively reduce power consumption. The entire roller table operation process demonstrates intelligent control. Attached Figure Description

[0021] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.

[0022] Figure 1 This is a top view schematic diagram of a roller table speed following control system according to an embodiment of the present invention;

[0023] Figure 2 This is a flowchart illustrating a roller speed following control method according to an embodiment of the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0025] It should be noted that although functional modules are divided in the system diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the system or the order in the flowchart. The terms "first," "second," "third," "fourth," etc., used in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed and are inherent to these processes, methods, products, or apparatuses.

[0026] Please refer to Figure 1 , Figure 1 This is a top view schematic diagram of a roller table speed following control system provided in an embodiment of the present invention. The system includes a PLC controller 110 and a roller table 120 disposed in front of the kiln. The PLC controller 110 can be independently disposed inside a PLC control cabinet. The roller table 120 is actually an independently usable loader. The roller table 120 is divided into five transmission sections according to the conveying sequence of the ceramic tile products 170, namely transmission section D1, transmission section D2, transmission section D3, transmission section D4, and transmission section D5. Transmission section D1 is connected to the upstream equipment, and transmission section D5 is connected to the downstream equipment 160. In addition, five [unclear text - possibly a device or equipment] are configured corresponding to the five transmission sections. There are five first motor components, namely first motor component M1, first motor component M2, first motor component M3, first motor component M4 and first motor component M5. First motor component M1 is used to control the operation of transmission section D1, first motor component M2 is used to control the operation of transmission section D2, first motor component M3 is used to control the operation of transmission section D3, first motor component M4 is used to control the operation of transmission section D4, and first motor component M5 is used to control the operation of transmission section D5. The five first motor components are controlled by the PLC controller 110. Here, PLC stands for Programmable Logic Controller.

[0027] The system also includes a photoelectric switch 130, a centering mechanism 140, and a fan 150. The photoelectric switch 130 is disposed on the transmission section D2, the centering mechanism 140 is disposed between the transmission sections D3 and D4, and the fan 150 is disposed on the transmission section D5. Furthermore, the centering mechanism 140 is equipped with a second motor assembly SM for controlling its operation, and the fan 150 is equipped with a third motor assembly M7 for controlling its operation. The photoelectric switch 130, the second motor assembly SM, and the third motor assembly M7 are all controlled by the PLC controller 110. It should be noted that, in this embodiment of the invention, two fans 150 are provided, each disposed at one end of the transmission section D5, and two third motor assemblies M7 are also provided.

[0028] In the specific implementation of this invention, the photoelectric switch 130 is used to detect the entry of ceramic tile products into the roller table 120. The roller table 120 is used to transport the ceramic tile products provided by the upstream equipment to the downstream equipment under the driving action of the five first motor components. The centering mechanism 140 is used to center and push the ceramic tile products on the roller table 120 neatly under the driving action of the second motor component SM. The fan 150 is used to cool, heat, or blow dust off the ceramic tile products on the roller table 120 under the driving action of the third motor component M7. The PLC controller 110 is used to adjust the rotation speed of the five first motor components, the second motor component SM, and the third motor component M7 in real time based on the operating status of the downstream equipment and the detection status of the photoelectric switch 130, thereby realizing the real-time adjustment of the operating status of the roller table 120, the centering mechanism 140, and the fan 150. The downstream equipment is actually the downstream transmission roller table.

[0029] according to Figure 1 The roller speed following control system shown is... Figure 2 This is a flowchart illustrating a roller speed following control method provided in an embodiment of the present invention. The method includes the following:

[0030] Step S210: The PLC controller obtains the first speed of the downstream equipment after adjusting the operation according to the kiln firing cycle, generates the first target speed of the roller table by combining the first proportional formula, and then performs closed-loop adjustment on the actual speed of the roller table.

[0031] Step S220: The PLC controller generates a second target speed for the fan based on the second proportional formula and the first speed, and then performs closed-loop adjustment on the actual speed of the fan;

[0032] Step S230: The PLC controller generates the third target speed of the centering mechanism according to the third proportional formula and the actual speed of the roller table, and then performs closed-loop adjustment of its actual speed when the centering mechanism is put into use.

[0033] In step S210 above, since the production process of ceramic tile products often involves adjustments such as changing production, increasing production, or decreasing production, the kiln firing cycle needs to be changed irregularly. After the operator adjusts the operating status of the downstream equipment according to the current required kiln firing cycle, a first speed encoder is installed on the downstream equipment. The first speed encoder reads the current first speed information of the downstream equipment and feeds it back to the PLC controller. The PLC controller then converts the first speed information into a first speed. That is, the PLC controller recognizes that the first speed information is hexadecimal data, first performs floating-point arithmetic on the first speed information to obtain the first angular velocity, and then multiplies the first angular velocity by the radius of the speed measuring wheel of the first speed encoder to obtain the first speed.

[0034] In step S210 above, the pre-constructed first proportional formula is used to characterize the speed relationship between the downstream equipment and the roller table, and the corresponding expression is: v 2o = v1×a±v2, where v 2o v1 is the first target speed of the roller table, v2 is the first speed of the downstream equipment, a is a pre-set first proportional coefficient, and v2 is the actual speed of the roller table.

[0035] It should be noted that by installing a second speed encoder on any transmission section of the roller table, the second speed encoder reads the current second speed information of the roller table and feeds it back to the PLC controller. The PLC controller then converts the second speed information into the actual speed of the roller table. In other words, the PLC controller recognizes that the second speed information is hexadecimal data, first performs floating-point arithmetic on the second speed information to obtain the second angular velocity, and then multiplies the second angular velocity by the radius of the speed measuring wheel of the second speed encoder to obtain the actual speed of the roller table.

[0036] In step S210 above, the PLC controller pre-constructs a first PID controller based on an existing PID control algorithm. PID stands for Proportion-Integral-Derivative. After obtaining the first target speed, the PLC controller can make closed-loop adjustments to the actual speed of the roller table. The corresponding implementation process includes the following:

[0037] Step S211: Each of the five first motor assemblies includes a first motor driver and a first motor connected thereto. The PLC controller synchronously transmits the first target speed to the five first motor drivers to convert it into five corresponding voltage control signals. After the five first motors synchronously receive the corresponding voltage control signals, the speed is adjusted to adjust the running state of the roller table.

[0038] Step S212: The PLC controller acquires the actual speed of the roller table in real time, and then performs a difference calculation between the first target speed and the actual speed of the roller table to obtain the deviation value: e1(t) = v 2o (t)-v2(t), where e1(t) is the speed deviation of the roller table at time t, v 2o v2(t) is the first target speed of the roller table at time t, and v2(t) is the actual speed of the roller table at time t.

[0039] Step S213: Analyze the deviation value e1(t) using the first PID controller to obtain the first drive signal as follows: Where Kp1 is the proportional coefficient of the first PID controller, Ti1 is the integral coefficient of the first PID controller, Td1 is the derivative coefficient of the first PID controller, and u1(t) is also called the first voltage control signal.

[0040] Step S214: The PLC controller synchronously transmits the first voltage control signal u1(t) to the five first motor drivers to perform power amplification processing, and after the five first motors synchronously receive the corresponding power amplified first voltage control signal u1(t), they adjust the speed to achieve the purpose of readjusting the running state of the roller table.

[0041] It should be noted that, if the first target speed does not change, the above steps S212 to S214 will be executed cyclically to form a local closed-loop control process; in addition, the actual speeds of the five transmission sections are the same, and the actual speed of each transmission section is the actual speed of the roller table.

[0042] In step S220 above, the pre-constructed second proportional formula is used to characterize the speed relationship between the downstream equipment and the wind turbine, and the corresponding expression is: v 3o = v1×b±v3, where v 3o denoted as the second target speed of the fan, b is a pre-set second proportional coefficient, and v3 is the actual speed of the fan.

[0043] It should be noted that the third motor assembly M7 includes a second motor driver and a second motor connected thereto. By installing a third speed encoder on the second motor, the third speed encoder reads the current third speed information of the fan and feeds it back to the PLC controller. The PLC controller then converts the third speed information into the actual speed of the fan. In other words, the PLC controller recognizes that the third speed information is hexadecimal data, first performs floating-point arithmetic on the third speed information to obtain the third angular velocity, and then multiplies the third angular velocity by the radius of the speed measuring wheel of the third speed encoder to obtain the actual speed of the fan.

[0044] In step S220 above, the PLC controller pre-constructs a second PID controller based on an existing PID control algorithm. After obtaining the second target speed, it can make closed-loop adjustments to the actual speed of the fan. The corresponding implementation process includes the following:

[0045] Step S221: The PLC controller transmits the second target speed to the second motor driver to convert it into a corresponding voltage control signal, and after the second motor receives the voltage control signal, it adjusts the speed to adjust the operating state of the fan.

[0046] Step S222: The PLC controller acquires the actual speed of the fan in real time, and then calculates the difference between the second target speed and the actual speed of the fan to obtain the deviation value: e2(t) = v 3o (t)-v3(t), where e2(t) is the speed deviation of the fan at time t, v 3o v3(t) is the second target speed of the wind turbine at time t, and v3(t) is the actual speed of the wind turbine at time t.

[0047] Step S223: Analyze the deviation value e2(t) using the second PID controller to obtain the second drive signal as follows: Where Kp2 is the proportional coefficient of the second PID controller, Ti2 is the integral coefficient of the second PID controller, Td2 is the derivative coefficient of the second PID controller, and u2(t) is also called the second voltage control signal.

[0048] Step S224: The PLC controller transmits the second voltage control signal u2(t) to the second motor driver to perform power amplification processing, and after the second motor receives the second voltage control signal u2(t) after power amplification processing, it adjusts the speed to achieve the purpose of readjusting the operating state of the fan.

[0049] It should be noted that, if the second target speed does not change, the above steps S222 to S224 will be executed cyclically to form a local closed-loop control process.

[0050] In step S230 above, the pre-constructed third proportional formula is used to characterize the speed relationship between the roller table and the centering mechanism, and the corresponding expression is: v 4o = v² × c × F, where v 4o The third target speed of the centering mechanism is denoted by c, which is a pre-set third proportional coefficient. The second motor assembly SM includes a third motor driver and a third motor connected thereto, and F is the pulse frequency defined by the third motor.

[0051] It should be noted that by installing a fourth speed encoder on the third motor, the fourth speed encoder reads the current fourth speed information of the centering mechanism and feeds it back to the PLC controller. The PLC controller then converts the fourth speed information into the actual speed of the centering mechanism. In other words, the PLC controller recognizes that the fourth speed information is hexadecimal data, first performs floating-point arithmetic on the fourth speed information to obtain the fourth angular velocity, and then multiplies the fourth angular velocity by the radius of the speed measuring wheel of the fourth speed encoder to obtain the actual speed of the centering mechanism.

[0052] In step S230 above, the PLC controller pre-constructs a third PID controller based on the existing PID control algorithm. After obtaining the third target speed, it can make closed-loop adjustments to the actual speed of the centering mechanism currently in use. The corresponding implementation process includes the following:

[0053] Step S231: The PLC controller transmits the third target speed to the third motor driver to convert it into a corresponding voltage control signal, and after the third motor receives the voltage control signal, it adjusts the speed to adjust the operating state of the centering mechanism.

[0054] Step S232: The PLC controller acquires the actual speed of the centering mechanism in real time, and then calculates the difference between the third target speed and the actual speed of the centering mechanism to obtain the deviation value: e3(t) = v 4o (t)-v4(t), where e3(t) is the velocity deviation value of the centering mechanism at time t, v 4o v4(t) represents the third target velocity of the centering mechanism at time t, and v4(t) represents the actual velocity of the centering mechanism at time t.

[0055] Step S233: Analyze the deviation value e3(t) using the third PID controller to obtain the third drive signal as follows: Where Kp3 is the proportional coefficient of the third PID controller, Ti3 is the integral coefficient of the third PID controller, Td3 is the derivative coefficient of the third PID controller, and u3(t) is also called the third voltage control signal.

[0056] Step S234: The PLC controller transmits the third voltage control signal u3(t) to the third motor driver to perform power amplification processing, and after the third motor receives the third voltage control signal u3(t) after power amplification processing, it adjusts the speed to achieve the purpose of readjusting the operating state of the centering mechanism.

[0057] It should be noted that, if the third target speed does not change, steps S232 to S234 will be executed cyclically to form a local closed-loop control process.

[0058] In this embodiment of the invention, when the PLC controller recognizes that the ceramic tile currently being transported on the roller table has just left the transmission section D2 based on the current detection status of the photoelectric switch, it will control the centering mechanism to start using by sending a drive control command to the second motor assembly SM to center and push the ceramic tile neatly.

[0059] Since the photoelectric switch outputs a high-level signal when it detects a tile product and a low-level signal when it does not detect a tile product, the PLC controller determines that the tile product has just left the transmission section D2. The corresponding implementation process is explained below with an example: Assume that the number of tile products is four and roughly arranged as follows... Figure 1 When the photoelectric switch is positioned as shown, and it is located precisely at the boundary between transmission section D2 and transmission section D3, the PLC controller will receive four transition signals generated by the photoelectric switch when it detects four ceramic tile products. These signals are, in sequence, rising edge transition signal, falling edge transition signal, rising edge transition signal, and falling edge transition signal. When the PLC controller detects the second falling edge transition signal, it will directly determine that the four ceramic tile products have just left the transmission section D2.

[0060] When the photoelectric switch is only installed on the transmission section D2, and the fixed distance between the photoelectric switch and the boundary line of the transmission section D2 and the transmission section D3 is L, the PLC controller first calculates the time T by dividing the fixed distance L by the actual speed of the roller table, and then continues to delay the time T after detecting the second falling edge jump signal before it can be determined that the four ceramic tile products have just left the transmission section D2.

[0061] It should be noted that during the entire process of the centering mechanism being put into use, that is, when the centering mechanism is centering and pushing the ceramic tile products transported on the conveyor section D3 and the conveyor section D4, in order to ensure the normal implementation effect of the centering mechanism, the PLC controller will monitor the level signal fed back by the photoelectric switch in real time, and when it detects that the level signal is a high level signal, it will control the first motor assembly M1 and the first motor assembly M2 to temporarily stop operating, thereby controlling the transmission section D1 and the transmission section D2 to temporarily stop operating.

[0062] In this embodiment of the invention, the transmission sections D3, D4, and D5 are redefined as a single end-effector. When the PLC controller does not receive a high-level signal from the photoelectric switch within a preset time interval (i.e., no new ceramic tile is about to enter the transmission section D3), and also recognizes that the end-effector is not currently transmitting ceramic tile, the PLC controller will control the third motor assembly M7, the first motor assembly M3, the first motor assembly M4, and the first motor assembly M5 to stop operating, thereby controlling the end-effector and the fan to stop running, in order to reduce unnecessary motor idling power consumption in the case of an empty kiln.

[0063] Alternatively, if the PLC controller does not receive a high-level signal from the photoelectric switch within a preset time interval (i.e., no new ceramic tile product is about to enter the transmission section D3), and also recognizes that the end drive group is currently transmitting ceramic tile products, the PLC controller will control the third motor assembly M7, the first motor assembly M3, the first motor assembly M4, and the first motor assembly M5 to stop operating at a specified time point, thereby controlling the end drive group and the fan to stop running, so as to reduce unnecessary motor idling power consumption in the case of an empty kiln.

[0064] Regarding the scenario where the PLC controller detects whether the end-effector is currently transmitting ceramic tile products, the relevant implementation process is explained in detail below using an example: Assume that the quantity of ceramic tile products is four and roughly arranged as follows... Figure 1The photoelectric switch is positioned as shown. When it is positioned exactly on the boundary line between transmission section D2 and transmission section D3, the PLC controller will acquire the four transition signals generated by the photoelectric switch when it detects four ceramic tile products. These signals are, in sequence, rising edge transition signal, falling edge transition signal, rising edge transition signal, and falling edge transition signal. When the PLC controller detects the second falling edge transition signal, it records the current timestamp as Time1. Then, it calculates the time T1 by dividing the total length of the end-drive group by the actual speed of the roller table. Since the timing time is also calculated from the timestamp Time1 when the second falling edge transition signal is detected, the PLC controller only needs to determine whether the timing time is less than the time T1. If yes, it is determined that the end-drive group is currently transmitting ceramic tile products. In this case, the specified time point can be defined as the timestamp after the time T1 delay from the timestamp Time1, that is, the ceramic tile products have left the end-drive group at the specified time point. If no, it is determined that the end-drive group is not currently transmitting ceramic tile products.

[0065] When the photoelectric switch is only installed on the transmission section D2, and the fixed distance between the photoelectric switch and the boundary line of the transmission section D2 and the transmission section D3 is L, the PLC controller records the current timestamp as Time2 when it detects the second falling edge transition signal. Then, it calculates the time T2 by dividing the sum of the total length of the end transmission group and the fixed distance L by the actual speed of the roller table. Since the timing time is also calculated from the timestamp Time2 when the second falling edge transition signal is detected, the PLC controller only needs to determine whether the timing time is less than the time T2. If yes, it is determined that the end transmission group is currently transmitting ceramic tile products. At this time, the specified time point can be defined as the timestamp after the delay of time T2 from the timestamp Time2, that is, the ceramic tile products have left the end transmission group at the specified time point. If no, it is determined that the end transmission group is not currently transmitting ceramic tile products.

[0066] It should be noted that the five first motors, the second motor, and the third motor are all of the same model. The values ​​of the first proportional coefficient a, the second proportional coefficient b, and the third proportional coefficient c are related to the specifications of the motors used in this invention. For example, when the speed ratio of the motor is 17.1:1, the outer diameter of the rod is 55mm, the outer diameter of the sprocket is 55mm, and the diameter of the driven wheel is 260mm, the value of the first proportional coefficient a is set to 5.2, the value of the second proportional coefficient b is set to 18.5, and the value of the third proportional coefficient c is set to 2.52.

[0067] In this embodiment of the invention, the PLC controller can also autonomously draw a ceramic tile product when it receives the rising edge transition signal fed back by the photoelectric switch, and update the position of the drawn ceramic tile product on the roller table in real time according to the actual speed of the roller table, thereby simulating the running trajectory of the drawn ceramic tile product on the roller table and intuitively reflecting it on the external human-machine interface that is connected to the PLC controller.

[0068] In this embodiment of the invention, the PLC controller can also upload the operating status data, production data information, alarm record information, etc. associated with the roller table, the photoelectric switch, the centering mechanism, and the fan to an external intelligent terminal system via a network connection to achieve open information visualization.

[0069] In this embodiment of the invention, by referring to the downstream equipment and adjusting the speed after operation according to the kiln firing cycle, the PLC controller is used to adjust the running speed of the roller table to adapt to the kiln transmission speed. At the same time, the operating status of the centering mechanism and the fan installed on the roller table is adjusted synchronously to improve the equipment utilization rate. When the photoelectric switch detects that there are no ceramic tile products being transported on the roller table, the fan and the transmission section on the roller table near the kiln are automatically controlled to stop operating to effectively reduce power consumption. Intelligent control is demonstrated throughout the entire roller table operation process.

[0070] Although the description of this application has been quite detailed and particularly focused on several of the described embodiments, it is not intended to limit itself to any of these details or embodiments or any particular embodiment. Rather, it should be considered as effectively covering the intended scope of this application by referring to the appended claims and taking into account the prior art, which provides for a broad possible interpretation of these claims. Furthermore, the foregoing description of this application with respect to embodiments foreseeable by the inventors is intended to provide a useful description, and non-substantial modifications to this application that have not yet been foreseen may still represent equivalent modifications.

Claims

1. A roller table speed following control method, characterized in that, The roller table is a loader installed at the front end of the kiln. The roller table is divided into five transmission sections according to the transmission sequence, defined as D1, D2, D3, D4, and D5. Each of the five transmission sections is equipped with a first motor assembly. Transmission section D2 is equipped with a photoelectric switch. A centering mechanism and a second motor assembly connected to it are installed between transmission sections D3 and D4. Transmission section D5 is equipped with a fan and a third motor assembly connected to it. Transmission section D5 is connected to downstream equipment. The five first motor assemblies, the second motor assemblies, the third motor assemblies, and the photoelectric switch are connected to a PLC controller. The method includes: The PLC controller obtains the first speed of the downstream equipment after adjusting its operation according to the kiln firing cycle, generates the first target speed of the roller table by combining it with the first proportional formula, and then performs closed-loop adjustment on the actual speed of the roller table; wherein, the expression of the first proportional formula is: first target speed = first speed × first proportional coefficient ± actual speed of the roller table, and the first proportional coefficient is a set value; The PLC controller generates a second target speed for the fan based on the second proportional formula and the first speed, and then performs closed-loop adjustment on the actual speed of the fan; wherein, the expression of the second proportional formula is: second target speed = first speed × second proportional coefficient ± current speed of the fan, and the second proportional coefficient is a set value; The PLC controller generates the third target speed of the centering mechanism based on the third proportional formula and the actual speed of the roller table, and then performs closed-loop adjustment of the actual speed of the centering mechanism when it is put into use; wherein, the expression of the third proportional formula is: third target speed = actual speed of the roller table × third proportional coefficient × pulse frequency, and the third proportional coefficient and the pulse frequency are both set values.

2. The roller speed following control method according to claim 1, characterized in that, Closed-loop adjustment of the actual speed of the roller table includes: The five first motor components are controlled to adjust the running state of the roller table according to the first target speed. The actual speed of the roller table is then acquired in real time and the difference between it and the first target speed is transmitted to the first PID controller for parsing to obtain the first drive signal. The five first motor components are then controlled to readjust the running state of the roller table according to the first drive signal.

3. The roller speed following control method according to claim 1, characterized in that, Closed-loop adjustment of the actual speed of the fan includes: The third motor assembly is controlled to adjust the operating state of the fan according to the second target speed. The actual speed of the fan is then acquired in real time and the difference between the actual speed and the second target speed is transmitted to the second PID controller for analysis to obtain the second drive signal. The third motor assembly is then controlled to readjust the operating state of the fan according to the second drive signal.

4. The roller speed following control method according to claim 1, characterized in that, When the ceramic tile product just leaves the transmission section D2, the PLC controller controls the centering mechanism to start operation, and throughout the operation, it manages the operating status of transmission sections D1 and D2 based on the current detection status of the photoelectric switch.

5. The roller speed following control method according to claim 1, characterized in that, Closed-loop adjustment of the actual speed of the centering mechanism includes: The second motor assembly is controlled to adjust the operating state of the centering mechanism according to the third target speed. The actual speed of the centering mechanism is then acquired in real time, and the difference between the actual speed and the third target speed is transmitted to the third PID controller for analysis to obtain the third drive signal. The second motor assembly is then controlled to readjust the operating state of the centering mechanism according to the third drive signal.

6. The roller speed following control method according to claim 1, characterized in that, Transmission sections D3, D4, and D5 are configured as an end-effector group. When the photoelectric switch does not detect any tile products within a specified time and the end-effector group is not transporting any tile products, the PLC controller controls the fan and the end-effector group to stop operating. Alternatively, when the photoelectric switch does not detect any tile products within a specified time and the end-effector group is transporting tile products, the PLC controller controls the fan and the end-effector group to stop operating at a specified time point, and at the specified time point, the end-effector group has already transported the tile products out.

7. A roller table speed following control system, characterized in that, The system includes a PLC controller, a roller table, a centering mechanism, a fan, and a photoelectric switch. The roller table is a loader installed at the front end of the kiln. The roller table is divided into five transmission sections according to the transmission sequence and is defined as D1, D2, D3, D4, and D5. Transmission section D5 is connected to downstream equipment. The centering mechanism is installed between transmission sections D3 and D4. The fan is installed in transmission section D5. The photoelectric switch is installed in transmission section D2. Five first motor assemblies are installed in the five transmission sections. The centering mechanism is equipped with a second motor assembly. The fan is equipped with a third motor assembly. The five first motor assemblies, the second motor assembly, the third motor assembly, and the photoelectric switch are connected to the PLC controller. The PLC controller is configured to execute the roller table speed following control method as described in any one of claims 1-6.

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