Industrial washing machine frequency conversion program

Abstract: With the continuous improvement of process requirements, the requirements of industrial washing machines for inverters are getting higher and higher. It is required to meet the requirements of industrial washing machines with high starting torque, multi-speed, wide voltage range, automatic slip compensation and fast and powerful communication methods. Other technical difficulties. And the performance is stable, can adapt to a variety of complex high temperature, high humidity environment.

Keywords: industrial washing machine, high starting torque, multi-speed, inverter

Industrial washing machine refers to the washing machine used for cleaning large quantities of clothes in hotels, rice, shops, laundries or factories. It has the characteristics of large washing capacity, good effect, low cost, high efficiency and low pollution. In recent years, industrial washing equipment is mainly based on washing equipment, and the application of frequency converters has become more and more popular. The frequency converter has brought a new technological revolution for industrial washing equipment, from the earliest non-regulated semi-automatic washing machine to Two two-speed motors are used to achieve a four-speed fully automatic washing machine, and finally a modern washing machine that can achieve multi-stage speed with only one motor. The key to the overall washing control of industrial washing machines is the smooth torque at low speed washing and the high rotational speed during dewatering. Due to the large load, a large resistance motor is used in order to obtain a large starting torque, and a braking device is additionally required for deceleration. With the development of high-power switching device manufacturing technology and computer control technology, the use of variable frequency speed control motor has penetrated into various electric drive systems.

How an industrial washing machine works

A washing machine is a cleaning appliance that uses electrical energy to produce a mechanical action to wash laundry. It has become very popular in our daily life. It saves time and effort and saves water, especially when it is cold and cold, it will really experience its beauty. We are divided into two categories, household and collective, according to their rated washing capacity. Industrial washing machines are a collective use.

The washing machine is divided according to the washing method, and can be divided into a pulsator type washing machine and a drum type washing machine. Let me first talk about the working principle of the pulsator washing machine circuit: after putting the clothes, open the valve of the faucet, select the correct water level and working procedure, turn on the power, close the door, the door safety switch is closed, and the water level switch at this time The internal common contact is connected to the dehydration contact, and the inlet valve is energized into the water. When the water level in the barrel reaches the specified height, the internal contact of the water level switch is disconnected from the dehydration contact and the washing contact is turned on under the action of the air pressure. When the water inlet valve is powered off, the water supply is stopped, the motor power is turned on, the motor starts to run, periodically rotates periodically, and then reverses, alternating with each other, and the pulsator is driven forward and reverse by the clutch. The pulsator rotating at a certain speed will drive the water and clothes in the bucket to form a rotating water flow, and the clothes rub against each other in the water flow to achieve the purpose of washing.

The industrial washing machine structure adopts a horizontal drum type. The drum washing machine is also a washing tub with a dewatering bucket, and the dewatering bucket is installed coaxially with the washing tub. The two buckets are flat and have a relatively large diameter, like a side-mounted basin, the basin mouth is facing the door, and the bottom of the dewatering bucket has an axis. The bottom shaft of the washing tub is traversed, and a pulley is installed, and the motor mounted on the outside of the washing tub is connected by a belt, and both barrels are made of stainless steel. The door of the drum washing machine faces directly in front. On the upper part of the washing machine and on the panel, there are inlet valve, drain valve, water level switch, program controller and other components. The working principle of the circuit is basically the same as that of the pulsator washing machine. The washing program is controlled by the program controller. Because the washing machine works in the washing state, the dewatering bucket rotates at a slower speed, while when working in the dehydrating state, the dewatering bucket should rotate at a high speed, the pulsator The washing machine realizes shifting by gear shifting inside the clutch, and the rotational speed of the motor is constant. The drum washing machine has no clutch shifting, but its motor is a two-speed motor, so when the washing machine is working in the washing state, the programmable controller turns on the washing low-speed winding of the motor, and the motor rotates slowly.

When it is in the dehydration state, the dehydration high-speed winding is turned on, and the motor runs at a high speed. This process is completed by the cooperation of the process controller and the motor.

2. Working process of industrial washing machine Fully automatic industrial washing machine refers to a large-capacity washing machine with functions of initial washing, washing, rinsing, bleaching and dehydration, and automatic conversion between functions without manual operation. According to different ways of vibration reduction and vibration isolation, industrial washing machines can be divided into suspension vibration isolation type and water injection balance vibration isolation type, and gravity fixed type. Currently, the mainstream products on the market are suspension type vibration-proof automatic industrial washing machines. It mainly consists of a casing, a frame panel, a spindle inner drum, a transmission system, a vibration isolation system, a front door component, a feeding component, a brake component, a drain valve component, an ultrasonic component, a control component, a pipe component, and a pneumatic system.

The working principle of the fully automatic industrial washing machine is that under the unified scheduling management of the timing controller, the asynchronous motor is controlled by the inverter to continuously perform the forward and reverse rotation to realize the asynchronous movement of the water and the laundry, thereby rubbing the water and the clothes. , 揉搓, to achieve the purpose of washing.

First, add water, reverse washing for 25 minutes, after washing, drain, enter the dehydration stage, the dehydration stage includes three processes: uniform, medium and high, and the uniform distribution is in the presence of water and water. Rotating forward at a higher speed than the washing process for 1.5 minutes, the clothes are evenly attached to the inside of the drum of the washing machine to make the subsequent dehydration process smooth; after draining, increase the rotation speed into the medium-speed dehydration process (2 minutes), and then enter The high-speed dehydration process (5 minutes) reduces the moisture content of the laundry to the required level. The speed of each stage is:

Washing: about 30rpm, uniform: about 60rpm

Middle off: 400rpm or so High off: 700~800rpm

Third, the automatic industrial washing machine transmission system

The transmission system is an extremely important part of the industrial washing machine, and it participates in all washing processes mainly because it provides power support for the washing machine. The transmission system consists of an electric motor and various shifting mechanisms. Now the inverter is mainly used, which significantly simplifies the components. It is usually composed of a frequency converter, a variable frequency motor, a pulley and a transmission belt. And the entire washing stage, with the frequency of the frequency converter automatically adjusted to achieve constant torque shifting (stepless speed regulation) without impact, no intermediate transition (transmission, transmission or coupling, clutch, etc.) The energy consumption of the washing process is significantly reduced.

Note: The customization of the V/F curve is the most critical step in the application and commissioning of industrial washing machines. During the commissioning process, continuous optimization must be carried out according to the on-site conditions. The main principles are as follows:

(1) The start of the industrial washing machine should be slow and stable, and the low-frequency starting torque of the inverter should be large.

(2) Pay attention to the slope of the V/F curve. If the slope of each set point of the V/F curve is too large, the running current will be too large, and the slope will be too small to start the operation. Therefore, it is necessary to comprehensively grasp the motor and its on-site conditions.

In summary, the normal operation of the industrial washing machine needs to make the washing machine motor high torque, multi-speed, wide voltage range, automatic slip compensation and convenient communication mode; and the performance is stable, can adapt to the high temperature of various hotels, hotel laundry rooms, High humidity environment, etc. Therefore, the frequency converter plays an irreplaceable role in it! This requires the inverter supplier to provide timely and complete services. In short, the inverter is required to adapt to the specific washing process requirements of the industrial washing machine and the service requirements of specific customer groups.