Speed regulation practical training device based on PLC

Abstract

The utility model discloses a speed regulation practical training device based on a PLC (Programmable Logic Controller). The speed regulation practical training device comprises the PLC, a tension controller, a magnetic powder brake, a precision speed reducer, a three-phase asynchronous motor and an encoder which are sequentially connected to form a loop, a switch and a frequency converter are sequentially connected between the PLC and the three-phase asynchronous motor, so that the PLC is connected with the switch, the frequency converter, the three-phase asynchronous motor and the encoder to form a loop, the encoder feeds back the rotating speed of the three-phase asynchronous motor to the PLC, and a frequency value given by the PLC again is transmitted to the frequency converter through the switch. Therefore, the rotating speed of the three-phase asynchronous motor is kept stable. According to the utility model, the PLC is adopted as a controller, and high-precision control of the three-phase asynchronous motor is realized by simulating the change of surrounding loads, so that the stability and controllability of the production process are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of speed regulation training in tobacco industry, in particular to a speed regulation training device based on PLC. Background Art

[0002] Traditional speed control devices have problems such as complex operation, inaccurate adjustment, and poor stability.

[0003] Programmable Logic Controller (PLC) is a digital electronic device with a microprocessor. It is a digital logic controller used for automated control. It can load control instructions into the memory at any time for storage and operation. The programmable controller is modularly composed of internal CPU, instruction and data memory, input and output unit, power module, digital simulation and other units. PLC can receive (input) and send (output) various types of electrical or electronic signals, and use them to control or supervise almost all kinds of mechanical and electrical systems.

[0004] The PLC-based speed control device can control the running speed of the equipment more accurately, and has the advantages of wide adjustment range, simple operation, and high stability. However, industry employees lack a set of PLC-based speed control training devices for training, resulting in an inability to accurately understand the PLC control system and the speed control operation in the real working environment in actual production. Therefore, tobacco industry enterprises need a PLC-based speed control training device to continuously improve the skills of employees and select better skilled talents for the industry. Utility Model Content

[0005] The purpose of the utility model is to provide a highly efficient, small, modular PLC-based speed regulation training device for tobacco industry enterprises, which is used to solve the technical problems of the speed regulation device in the prior art, such as complex operation, inaccurate regulation, poor stability, etc.

[0006] The utility model solves the above problems through the following technical solutions:

[0007] The PLC-based speed regulation training device includes a PLC controller, a tension controller, a magnetic powder brake, a precision reducer, a three-phase asynchronous motor and an encoder which are connected in sequence to form a loop; a switch and a frequency converter are also connected in sequence between the PLC controller and the three-phase asynchronous motor, so that the PLC controller is connected to the switch, the frequency converter, the three-phase asynchronous motor and the encoder to form a loop, the speed of the three-phase asynchronous motor is fed back to the PLC controller through the encoder, and the frequency value re-given by the PLC controller is transmitted to the frequency converter through the switch, so that the speed of the three-phase asynchronous motor remains stable.

[0008] As a further improvement of the present invention, the PLC controller includes a CPU, a digital input and output module and an analog input and output module. The CPU is the core component of the PLC controller and is responsible for processing input signals and controlling output signals to achieve automatic control. The digital input and output module and the analog input and output module are interfaces for the PLC controller to communicate with external devices and are responsible for receiving signals from external sensors and actuators, converting the signals into digital signals or analog signals and inputting them into the CPU, as well as converting the digital signals or analog signal outputs of the CPU into signals that can be accepted by external devices.

[0009] As a further improvement of the present invention, the digital input and output module and the analog input and output module both have an input module and an output module, wherein the input module and the CPU, and the input module and the output module are connected by a U-shaped connector.

[0010] As a further improvement of the present invention, the switch is connected to a display screen.

[0011] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0012] PLC is used as the controller, with S7-1200 PLC as the core, and PID speed control algorithm is adopted to achieve high-precision control of the three-phase asynchronous motor by simulating the changes in the surrounding load, thereby ensuring the stability and controllability of the production process.

[0013] This set of training devices can not only help cultivate employees' skills and improve their understanding and application of PLC control systems, but also simulate the real production environment of the factory through this training device to ensure the stability and controllability of the production process, thereby improving production efficiency and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a line diagram of the speed regulation training device based on PLC of the utility model. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] Example

[0017] Combined with Figure 1As shown in the figure, a PLC-based speed regulation training device can simulate the automated control and optimization in the tobacco production process, thereby improving production efficiency and product quality. The training device includes: a PLC controller, a switch, a frequency converter, a three-phase asynchronous motor, an encoder, a precision reducer, a magnetic powder brake, and a tension controller, etc., and each component is connected by cables.

[0018] Among them, the PLC controller, tension controller, magnetic powder brake, precision reducer, three-phase asynchronous motor, and encoder are connected in sequence to form a loop; the switch and frequency converter are also connected in sequence between the PLC controller and the three-phase asynchronous motor, so that the PLC controller is connected to the switch, frequency converter, three-phase asynchronous motor, and encoder to form a loop, and the speed of the three-phase asynchronous motor is fed back to the PLC controller through the encoder, and the frequency value re-given by the PLC controller is transmitted to the frequency converter through the switch, so that the speed of the three-phase asynchronous motor remains stable.

[0019] Frequency converter: It is used to adjust the speed of three-phase asynchronous motor by changing the frequency of the frequency converter.

[0020] Tension controller: Set a tension value manually or automatically to simulate load changes.

[0021] Magnetic powder brake: used to transmit torque.

[0022] PLC controller: used for input and output signal control, and uses PID speed control algorithm to set the frequency value of the inverter.

[0023] Switch means "switch" and is a network device used for forwarding electrical (optical) signals. It can provide an exclusive electrical signal path for any two network nodes connected to the switch.

[0024] Encoder: The measured angular displacement is directly converted into a digital signal (high-speed pulse signal), and then the high-speed pulse signal is directly input to the PLC controller. The high-speed counter of the PLC controller is used to count the high-speed pulse signal to obtain the measurement result.

[0025] The precision reducer is a power transmission mechanism that uses a gear speed converter to reduce the motor's rotation speed to the required number of rotations and obtain a larger torque.

[0026] Three-phase asynchronous motor: converts electrical energy into mechanical energy and is used to drive various mechanical equipment.

[0027] Working principle: By manually or automatically operating the tension controller and changing the braking torque of the magnetic powder brake to simulate load changes, as the load changes, the speed of the three-phase asynchronous motor and precision reducer will change while the frequency of the inverter remains unchanged. After the rotary encoder detects the actual speed, it will be fed back to the PLC controller. The PLC controller compares the actual speed feedback with the set speed, and re-assigns the frequency value of the inverter through the switch to keep the speed of the three-phase asynchronous motor stable.

[0028] Preferably, in this embodiment, the switch is also connected to the display screen.

[0029] The utility model adopts a PLC controller and a PID speed regulation algorithm to realize accurate control of a three-phase asynchronous motor, thereby accurately regulating the speed of the three-phase asynchronous motor.

[0030] In a specific embodiment, a speed regulation training device based on PLC, the PLC controller includes a CPU, a digital input and output module and an analog input and output module. The CPU is the core component of the PLC, which includes a PID speed regulation algorithm, which is responsible for processing input signals, controlling output signals, and realizing automatic control functions. The input and output module is the interface for PLC to communicate with external devices. It is responsible for receiving signals from external sensors and actuators, converting the signals into digital signals or analog signals and inputting them into the CPU, or converting the digital signals or analog signals of the CPU into signals that can be accepted by external devices. The CPU and the input module, and the input module and the output module are connected by U-shaped connectors.

[0031] Optionally, the PLC controller model is S7-1200 PLC, in which the CPU model is 1214C DC / DC / DC6ES7214-1AG40-0XB0, the digital input and output module model is SM1223DC / RlySM1223, the analog input and output module model is SM 1234AI / AOSM1234, the switch model is EDS-108, the inverter model is FC-302PK37T5E20H2XGCXXXSXXXXALBXCXXXXDX, the three-phase asynchronous motor model is YS6314GA, the encoder model is K58-J3PH1024B20, the magnetic powder brake model is FZ-D-2.5Kg, and the tension controller model is KTC800A. The above-mentioned components are integrated into one to form a training device.

[0032] Although the present invention is described herein with reference to the illustrative embodiments of the present invention, the above embodiments are merely preferred embodiments of the present invention, and the embodiments of the present invention are not limited to the above embodiments. It should be understood that those skilled in the art can design many other modifications and implementations, which will fall within the scope and spirit of the principles disclosed in this application.

Claims

1. The speed regulation training device based on PLC is characterized by: It includes a PLC controller, a tension controller, a magnetic powder brake, a precision reducer, a three-phase asynchronous motor and an encoder which are connected in sequence to form a loop; a switch and a frequency converter are also connected in sequence between the PLC controller and the three-phase asynchronous motor, so that the PLC controller is connected with the switch, the frequency converter, the three-phase asynchronous motor and the encoder to form a loop, the rotation speed of the three-phase asynchronous motor is fed back to the PLC controller through the encoder, and the frequency value re-given by the PLC controller is transmitted to the frequency converter through the switch, so that the rotation speed of the three-phase asynchronous motor remains stable.

2. According to the PLC-based speed regulation training device of claim 1, it is characterized in that: The PLC controller includes a CPU, a digital input and output module, and an analog input and output module. The CPU is the core component of the PLC controller and is responsible for processing input signals and controlling output signals to achieve automatic control. The digital input and output module and the analog input and output module are interfaces for the PLC controller to communicate with external devices and are responsible for receiving signals from external sensors and actuators, converting the signals into digital signals or analog signals and inputting them into the CPU, as well as converting the digital signals or analog signal outputs of the CPU into signals that can be accepted by external devices.

3. The PLC-based speed regulation training device according to claim 2 is characterized in that: The digital input and output module and the analog input and output module both have an input module and an output module, wherein the input module and the CPU, and the input module and the output module are connected by a U-shaped connector.

4. The PLC-based speed regulation training device according to claim 1 is characterized in that: The switch is connected with a display screen.

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