Design and development of intelligent disinfection shoe cabinet

The disinfection shoe cabinet is an upgrade from the traditional wooden shoe cabinet. At present, there are various names of this product on the market, such as electronic shoe cabinet, electronic disinfection shoe cabinet, smart electronic shoe cabinet, multi-functional smart shoe cabinet, etc. There is no standard name, but the main function Basically, it has the functions of deodorization, sterilization, disinfection, drying, warmth, and intelligent control. Therefore, it is referred to as the disinfection shoe cabinet for short, and all disinfection shoe cabinets in the market are classified into two types: wooden shoe cabinet and metal shoe cabinet.

1. The development background of intelligent disinfection shoe cabinet

Many families are accustomed to self-made shoe cabinets. Its inherent shortcomings are that the space is closed, airtight, and prone to bacterial parasitic. At the same time, harmful substances such as benzene and formaldehyde remain in the wood products, which are harmful to human health. Traditional wooden shoe cabinets have great hygiene problems, and they must be eliminated by people eventually.

With the development of the economy and the continuous improvement of people’s living standards, people are no longer satisfied with the single storage function of traditional shoe cabinets, and are developing towards a more diversified and intelligent direction, with deodorization, sterilization, disinfection, moisture removal, warmth, shoe polishing, Intelligent control and other multi-function disinfection shoe cabinets will surely become people's first choice, and traditional wooden shoe cabinets will be eliminated by the market. But at present, the product is accepted by the market. There is still a process for the product itself to be gradually improved.

Second, the main technical principles of the intelligent disinfection shoe cabinet

2.1 The principle of ozone deodorization

The main components that cause odor and spoilage in nature are ammonia, hydrogen sulfide, methyl mercaptan, dimethyl sulfide, dimethyl disulfide, etc. Ozone can react with them to oxidize and decompose into non-toxic and odorless Substances, so as to achieve the effect of deodorization and deodorization. The principle of ozone deodorization is the principle of oxidative decomposition. It does not use the unique smell of ozone itself to cover up the bad smell, but combines with the peculiar smell to decompose the smell and release oxygen (0). Therefore, in addition to removing odors, ozone can also improve the purity of oxygen molecules (0:) in the air.

2.2 The principle of ozone sterilization

Ozone is a strong oxidant, which can oxidize and decompose the enzymes necessary for the internal glucose of bacteria to inactivate and die. And it can directly interact with bacteria and viruses, destroy their organelles and DNA, RNA, destroy the metabolism of bacteria, and cause the death of bacteria. It can also penetrate through the cell membrane tissue and invade the cell, acting on the lipoprotein of the outer membrane and the lipopolysaccharide inside, causing the bacteria to undergo permeabilization and distortion and dissolve death. Ozone sterilization is a bacteriolytic-level method, complete sterilization, no residue, can kill bacterial propagules and spores, viruses, fungi, etc., can destroy botulinum toxin, and has a strong killing effect on molds. Due to its poor stability, ozone will quickly decompose into oxygen or a single oxygen atom by itself, and a single oxygen atom can combine into oxygen molecules by itself without any toxic residue. Therefore, ozone is a pollution-free disinfectant. Ozone is a gas, which can quickly diffuse into the entire sterilization space, without dead ends, and the sterilization effect is the most thorough and obvious.

2.3 Principle of low temperature drying

Using the perfect combination of PTC corrugated heater, blower and air duct, a hot circulating air system is formed inside the machine, coupled with the temperature controller's adjustment of temperature, so that the internal temperature of the machine can be relatively balanced and controlled under a certain temperature. The constant temperature circulating wind will remove dampness and dry the shoes, keep the shoes dry, and the shoes will not become moldy.

2.4 Overall foaming technology

The inner and outer boxes of the disinfection shoe cabinet adopt cyclopentane foaming technology to form an insulating layer between the inner and outer parts, and the door is equipped with a magnetic sealing strip, which is completely sealed when the door is closed, which makes the heat insulation and heat preservation effect better. This technology is suitable for large-scale production enterprises. The product has just started to be processed, basically all manually, the box is divided into multiple pieces of stamping and bending, and then combined welding, foaming is manually filling the granular material into the box and the shell. By 2012, some manufacturers have reformed the process of disinfecting shoe cabinets. The cabinet adopts double-layer special cold-rolled plates, which are stamped and formed at one time, so that the cabinet has a compact structure and no obvious interface. Then, it adopts the automotive industry paint technology and high-temperature spraying to make the cabinet. The appearance of the body is uniform in color, without color difference, and easy to clean. The cabinet door is made of stainless steel glass or high-grade acrylic material, one-time injection molding, industrial lamination process, no paint added.

At present, in addition to the above methods, there are also the use of negative ion generators, LEDs, ultraviolet lamps (in fact, ultraviolet disinfection), and deodorizers, fragrances, and incense methods are added to deodorization. Negative ions play a role in air purification and can remove peculiar smells in the air. LED and ultraviolet lamps are not completely sterilized, and they cannot be sterilized in places where the light does not shine, and they are harmful to the human body. The deodorizing methods such as deodorizers, perfumers and incense can only cure the surface and not the root cause, and cannot solve the odor. The fundamental problem of taste.

It can be seen from the above that ozone should be the most effective and the best deodorization, sterilization, and disinfection method at present. It is also a method commonly used in the market. Its technology is also mature, but it is unprecedented in shoe cabinets. How to grasp it and make it achieve the best results is a subject that all production enterprises must study and overcome.

Third, the design ideas of the intelligent disinfection shoe cabinet

Intelligent furniture is the application of intelligent control technology to traditional furniture, so that the furniture has the characteristics of automation, humanization, and convenience, and can meet more functional needs of users. In the future development of furniture, smart furniture represents a new development direction and will also form a new economic growth point for the furniture industry. Although smart furniture is still in the conceptual design and experimental development stage, it has shown a strong momentum of development.

The most important part of smart furniture is the signal acquisition and control processing part, which is to collect and convert the analog signal output by the sensor into a digital signal. After the digital signal is calculated and processed, the result is displayed. The FPGA chips currently on the market have very powerful performance, with strong logic control and digital signal processing capabilities. At present, most of the smart furniture on the market are controlled by single-chip microcomputers or embedded electronic computers. Compared with mainstream products, the use of FPGA to design the control system of smart furniture has high integration, small size, large number of pins, and easy modification. , And the advantages of short design cycle, low development cost, low risk, low power consumption, high reliability and flexible design. And when the latest system appears, it is convenient for system upgrade and system expansion. At the same time, FPGA is good at processing parallel signals, and the real-time signal acquisition and processing is strong. Therefore, the design of smart furniture based on FPGA control is very promising and market-oriented. The following mainly discusses the intelligent shoe cabinet control system with you.

4. Architecture design of intelligent shoe cabinet control system

In the design, FPGA is the control and processing core of the entire system, and the relevant functional modules of the control system complete the task of signal acquisition and processing. Integrating the various functions of the shoe cabinet, the designed smart shoe cabinet must have basic functions such as sterilization and disinfection, dispelling dampness and mildew, and it must not damage the shoes in the shoe cabinet while having these functions. The block diagram of the designed intelligent shoe cabinet control system is shown in Figure 1. It mainly includes the main control center, humidity signal acquisition and processing, door opening signal acquisition and processing, disinfection, deodorization, clock, peripheral circuits and various sensors.

4.1 Dehumidifying the shoe cabinet

Most of the shoes placed in the shoe cabinet are leather products, and they are extremely susceptible to mildew in a warm and humid environment at a temperature of 25°C to 35°C and a relative humidity of 75% to 95%. Especially in southern China, the humidity and temperature of a large part of the weather are within this range every year. Because the power required for temperature control is too high, it is only necessary to ensure that the humidity in the shoe cabinet is not higher than 75%. The purpose of moisture-proof. After the humidity sensor detects the humidity, the humidity signal is processed after A/D conversion. Whenever the humidity exceeds 75%, the humidity signal wet is set from 0 to 1, and the main control center performs signal processing, and the dehumidification signal dry is set from 0 1. Turn on the peripheral dehumidification circuit to dehumidify the shoe cabinet. When the relative humidity is lower than 75%, the humidity signal is set from 1 to 0, and the shoe cabinet is closed for dehumidification.

4.2 Door opening alarm and lighting

Shoe cabinets are generally placed where they can be seen and used when they enter the door. Many people have the bad habit of forgetting to close the door of the shoe cabinet after opening the shoe cabinet and changing shoes, which not only affects the appearance, but also has an unpleasant smell. The pressure sensor detects whether the door is open or not. When the door is opened, the door open signal door is set to 1, and after sending it to the main control center for processing, the door open alarm and lighting are turned on. The alarm time lasts for 30 seconds, reminding to close the shoe cabinet door. When the open signal is set to 0, the lighting is turned off when the cabinet door is closed.

4.3 Disinfection and deodorization

The shoes cannot be placed in a relatively high temperature environment for a long time. In order to protect the shoes from damage, a low-energy electromagnetic radiation-ultraviolet light is used to disinfect and deodorize the shoe cabinet. When the disinfection button is pressed manually, the signal s is set to 1, the UV is turned on after the control center, after a duration of 30 minutes, the UV is turned off, and s and c are set to 0.

4.4 Clock division

Divide the input high_clk of 20MHz to obtain a clk_1Hz clock with a frequency of 1Hz. This clock cycle is 1s. After passing the timer counter30, a 30s timing pulse is obtained, which is the alarm timing clock. At the same time, the clock obtained by counter30 is input to counter10 for counting, and a timing pulse of 5 minutes is obtained, which is the timing clock for door opening. And at the same time, the 5min timing pulse output by this counter10 is output to counter6 for counting, and the 30min timing pulse is obtained, which is the timing of the UV time and dehumidification time, as shown in Figure 2.

4.5 Main control part

The working state of the smart shoe cabinet is divided into four states: disinfection, dehumidification, lighting alarm and standby, corresponding to state1, state2, state3, and state0, respectively. The state transition diagram is shown in Figure 3. When the disinfection signal s inputs a pulse set from 0 to 1, the operating state of the shoe cabinet control system is transferred from standby to disinfection, and after 30 minutes of timing, s is set to 0 and returns to the standby state. When the humidity signal wet is 1, the working state of the shoe cabinet changes from standby to dehumidification state2, and when wet becomes 0, the working state of the shoe cabinet changes from dehumidification to standby state0. When the door open signal door is set from 0 to 1, enter state3 to turn on the lighting, and after 5 minutes of timing, the working state of the shoe cabinet changes from standby to door open alarm. When door becomes 0, the shoe cabinet working state returns from door open alarm back To the standby state0 state. In the state of disinfection state1 and dehumidification state2, when the door signal is set from 0 to 1, the original state will be suspended, and the state will be entered first. After the state is completed, it will return to the original state to continue. Through the conversion of these three states, the conversion control of the working state of the shoe cabinet is achieved.

5. Application of smart shoe cabinet technology

A new technology must be recognized by the market. If it is not accepted by the market, it will be eliminated by the society. The same goes for disinfecting shoe cabinets. So, how to make the disinfection shoe cabinet be accepted by the market, especially by ordinary people. In fact, it can be summed up in 8 words: practical, economic, safe and convenient.

(1) Practical: Practical means that the purchased product is useful to the buyer. Because of the characteristics of the disinfection shoe cabinet, it is impossible for consumers to have the impulse to buy, such as buying high-end watches, Apple mobile phones, etc., which can show their identity, and it has not become a necessity like refrigerators and air conditioners, which every household must buy. According to the principle of practicality, then, how to make consumers feel practical? At present, the function of disinfecting shoe cabinets on the market is trivial and has everything, so that consumers don’t know why. In fact, it is nothing more than deodorization, 4 main functions of sterilization, disinfection and drying. If there is no drying function, how can it be possible to remove damp, dehumidify, mold, and keep warm? If there is no sterilization and disinfection, what else can we talk about eradicating beriberi and protecting shoes? As for the air purification function, I think it should not be needed as a shoe cabinet. The function of the shoe cabinet is for storage. In order to make the shoes better visible, we have added deodorization, sterilization, disinfection, and drying functions, so that the storage quality of the shoes has been greatly improved, and the smell on the shoes is gone. All kinds of bacteria are gone, and damp shoes have dried out. This will meet the needs of consumers.

(2) Economy: Economy means economical benefits. In layman's terms, it is cheap, but it is not all cheap. It is based on practicality, and the price is cheaper. If you buy a useless product, no matter how cheap it is, it will not reflect the value. As a manufacturer, when producing products, on the basis of ensuring practicality, try to reduce costs.

(3) Safety: Safety as an electrical product is a national mandatory requirement. If the product is unsafe and causes personal injury, who dares to buy your product and who dare to use your product.

(4) Convenience: The product should be simple and convenient to use, and should not be too complicated. It is best to be a fool, and anyone can operate it at a glance. Or it can help consumers design it and use it when they buy it home. As a manufacturer of disinfecting shoe cabinets, it should closely focus on its Bazi policy and four major functions, and make a full contribution to these aspects. At the same time, the technology can also be applied to wardrobes and file cabinets.

to sum up

When the power is on, the shoe cabinet is in standby mode, and the signal control processing is performed according to different sensor signals to make the shoe cabinet work in dehumidification, anti-mold, door open alarm and other working states, and the working state is carried out by clock division. In order to achieve the purpose of control, the designed intelligent shoe cabinet control system basically meets the needs of the shoe cabinet.