In order to improve the stability of mechanical energy-saving control of heat shrinkage packaging machine, the controller was optimized. A mechanical energy-saving control method based on fuzzy Smith feedback regulation is proposed. Constrained parameter model of mechanical energy-saving control for heat shrinkable packaging machine is constructed to optimize the control law.
With the ultra-low power core control actuator of A RM Cortex? M0, the hardware of mechanical energy-saving controller is developed in embedded environment, including A/D module, electric actuator module, program loading module, etc. The experimental results show that the mechanical energy-saving control stability of the heat-shrinkable packaging machine is good, the energy cost of the heat-shrinkable packaging machine is reduced, and the energy-saving effect is optimized. Heat shrinkable packaging machine, also known as shrinkage machine, is widely used in the packaging of glass bottles, foam gum, cartons, pharmaceuticals, cosmetics and other items. It has the advantages of wide application range, good sealing, high transparency and is widely used. Heat shrinkable packaging machine uses shrinkable film to wrap the product or package outside, and then heat it to realize product packaging.
The heat shrinkable packaging machine consumes a lot of power and is easy to burn down circuit or electrical components. It needs to design mechanical energy-saving control of the packaging machine to reduce the output power consumption of the packaging machine and improve the stability of the mechanical control of the packaging machine [1]. The optimum design method of mechanical energy-saving controller for heat shrinkable packaging machine was studied to realize energy saving and emission reduction, reduce power consumption and improve packaging smoothness.
A mechanical energy-saving control method based on fuzzy Smith feedback regulation is proposed. The control algorithm and hardware design of the mechanical energy-saving controller for packaging machine are carried out. In order to realize the mechanical energy-saving control of heat shrinkage packaging machine, the control constraints parameter model is first constructed. A two-degree-of-freedom function with time delay is constructed to describe the power gain in the process of mechanical energy-saving control of heat-shrinkable packaging machine. After step training and learning, the constrained parameter analysis of mechanical energy-saving control of heat-shrinkable packaging machine is realized, which provides a parameter input basis for the optimal design of the controller. The self-stabilizing control parameters of mechanical energy-saving control are adjusted by the maximum sensitivity feedback method, and the closed-loop control law of mechanical energy-saving control is constructed. In the case of continuous disturbance, in order to reduce the energy cost of the mechanical energy-saving controller, thermostatic element a fuzzy Smith feedback regulation term is added to realize the mechanical energy-saving control. The input/output model of the control law is obtained as shown in Figure 1. Fig. 1: It is an adaptive correction parameter; it is a tracking error term; and it is an open-loop control function. In the model, the input vector of the mechanical energy-saving controller of the heat-shrinkable packaging machine can be adjusted adaptively to reduce the energy cost of the controller. The designed control algorithm is loaded by program to realize the hardware design of the controller. The core control actuator of A RM Cortex? M0 with ultra-low power consumption is used to develop the hardware of the mechanical energy-saving controller in embedded environment. The mechanical energy-saving control unit of the packaging machine includes information acquisition module, direct control module, A/D module and electricity module. Dynamic execution module, embedded control module and driver module etc. [5]. In the design of communication module of upper computer, several internal registers are used to buffer instructions, so as to reduce the energy attenuation of mechanical energy-saving control. Embedded DSP chip is used to integrate control information, so as to stabilize the speed of motor driver, improve the stability of controller, and obtain the functional structure of controller. The block diagram is shown in Figure 2. In the executive unit of the controller, the low-power D SP is used to control the A/D conversion frequency, and the control signal acquisition and bus control processing are carried out.
The output power gain of the mechanical energy-saving control of the packaging machine is improved by the power gain amplifier module. The controller is designed with three layers structure. The embedded integrated information processing of mechanical energy saving control of packaging machine is carried out by using TMS320VC5509A DSP chip. The control instructions are collected to make intelligent judgment of packaging process. The hardware of mechanical energy saving controller is developed in embedded environment. A/D module is the function of controlling information acquisition and digital/analog conversion for energy-saving control of packaging machine. The peripheral circuit of A/D module of 16-bit fixed-point DSP controller is designed, and the loading model of A/D program driven by multi-threads is established. On the platform of ARM? Linux, the control parameter setting and control arithmetic of the mechanical energy-saving controller of heat shrinkable packaging machine are written. The A/D module of the controller is composed of A/D, D/A and signal processor (DSP). Assuming that the input power range of the controlled D/A is 0-10 W, the frequency response characteristics of the output of the A/D module are shown in Fig. 3 through the adaptive adjustment of the controller.
The electric actuator module is the core control module of the controller.
ADSP21160 of ADI company is used as the main control chip. Through Low-Power Embedded control, dual-threaded program loading of floating-point DSP and fixed-point DSP is carried out, and 8-bit A/D chip is used for linkage control of the electric actuator. In the central unit of the whole heat shrinkable packaging machine control, the AC drive amplification mode is adopted to reduce energy loss, realize mechanical energy-saving control and electric execution [7]. The input control signal of heat shrinkage packaging machine is amplified and filtered. Logic control and program writing are carried out through program loading module. Visual DSP 4.5 compiler compiles the control algorithm by human-computer interaction, and designs the output interface and loads the program in the embedded environment. The internal system of 12-channel DMA bus was used for clock control [8], and the optimal design of mechanical energy-saving controller for heat-shrinkable packaging machine was realized. In the experimental analysis of the controller, the external interface chip chooses the multi-byte control command word and uses the hexadecimal serial bus to write the control command. Set the A/D sampling number of mechanical energy-saving control to 12 bits, control instruction switching mode to knowledge rule base guidance mode, set the sampling period of control instruction information to 0.02 seconds, and the instruction cycle of fuzzy Smith control to 0.25 seconds.
The output interface trigger truth table of the controller is shown in Table 1. According to the above experimental environment and parameter setting, the mechanical energy-saving control simulation of thermal shrinkage packaging machine is carried out, and the convergence curve of the control output is obtained as shown in Figure 4. The comparison results of power and energy expenditure after energy-saving control by different methods are shown in Fig. 5. The results in Fig. 5 show that the proposed controller has good convergence and improves the mechanical energy-saving performance. In this paper, the optimal design of the controller of heat shrinkage packaging machine is carried out, and a mechanical energy-saving control method based on fuzzy Smith feedback regulation is proposed, and the experimental comparison and analysis are carried out. The experimental results show that the mechanical energy-saving control and stability of the heat-shrinkable packaging machine are better, the energy cost of the heat-shrinkable packaging machine is reduced, the energy-saving effect is optimized and the control performance is superior.