ベローズ

ベローズとは

ベローズ

ベローズとは、金属製薄肉で蛇腹構造を持った、伸縮性と曲げ性を有する柔軟性のある部材のことです。

ベローズは、アコーディオンについている、伸縮変形して空気を送り出す波打ち型の部分を、円筒形にした形状をしています。

ベローズの最大の特徴は、2つの装置どうしや配管口どうしの間を接続する際に、両方の接続口の位置をある程度自由に変えられる柔軟性にあります。また、製造方法によって気密性を持たせたり振動吸収性を持たせるなど、様々な機械性能を付加することができます。これらの特性を活かして、ベローズは真空ポンプを始め様々な用途で使用されています。

ベローズの使用用途

ベローズは、高い気密性を持つチューブ、空気や液体を送る管、ケーブルや駆動部分などの保護カバー、装置間の振動や熱の伝道を遮断する接続部材、駆動部品、センサーなど多くの分野で使用されています。

ベローズは、基本的に伸縮や変形が可能な柔軟な構造を持っており、それに様々な機能を付加することで広い用途で使用されています。

1. 気密性を持ったベローズ

ベローズは高い気密性を持たせることが可能です。そのため、真空ポンプとチャンバーの間を繋ぐ配管として使用されています。また、振動を吸収する機能も持っているので、ポンプの振動をチャンバー側に伝えない役割も果たせます。

2. 耐高温性に優れたベローズ

耐高温性に優れたベローズは、工場の設備などで高温のガスや蒸気を送り込むための配管として使用されます。さらに、柔軟な引き回しが可能なことから熱風などの排気ダクトとしても使用されます。

3. 保護機能に優れたベローズ

ロボットの関節部分や、精密機械の可動部を外部からの衝撃や、空気中の塵から守るための保護カバーとしてベローズが使用されます。機械の動作に合わせて曲がる一方で、変形しても内径の大きさが変化しない特性が保護カバーの役目を果たしています。

4. バネ性能を活かしたベローズ

伸縮性と気密性能を持ったベローズは、内部を加圧すると伸びます。また、バネの特性を持ったベローズは上部から荷重がかかると縮み、なくなると元に戻ります。このような機能性能を持たせたベローズは、ピストンやセンサーなどに応用されています。

また、ベローズは昔のカメラでは遮光性と防塵性を活かして、カメラとレンズの間を繋ぐ部材として使用されていました。

このようにベローズは柔軟性を持った管というだけではなく、それにプラスの性能を持たせることで使用目的の異なる広い用途を持つ部材です。

ベローズの原理

ベローズは山と谷の部分が交互につながる形状を持つことによって、フレキシブルな管になっています。ベローズにどのような性能を持たせるかによって、ベローズの材料と製法が決まります。

一般的にベローズはステンレス合金、アルミニウム合金、チタン合金などの合金によって作られます。金属の違いによって伸縮性や耐圧性、曲げ耐性、耐久性に違いが出てきます。

代表的な金属ベローズの製法には成形と、溶接があります。

成形ベローズは、金属パイプを加圧成形して作られます。安価で大量生産が可能で、大きな伸縮性が必要でない部位に適しています。

一方、溶接ベローズは、金属製ワッシャーを積み重ね、上下のワッシャーの内縁と外縁を次々に溶接することで作られます。伸縮性が大きく、精密な加工が可能で耐圧力にも優れていますが、高価で大量生産には向きません。

また、ゴムのように合成樹脂でできたベローズもあります。

ベローズの選び方

ベローズは、使用用途の項目で記述したように、様々な用途で使用できます。装置の一部にベローズを採用する際には、どのような目的でベローズを組み込むのかを明確にする必要があります。それによって、ベローズに求められる性能が決まり、それに最適な材質と形状、製造方法が明確になります。

ベローズには広い使用用途があり、ベローズの製造メーカーにもそれぞれ特徴や強みがあるようです。自社の使用目的に合ったメーカーを探してみるのが良いでしょう。

また、ベローズは ”フレキシブル” が特徴の部材ですので、既存の使用用途には無くても、新しい用途でベローズが使えないかと検討中であれば、メーカーに積極的に相談することをお薦めします。

参考文献

http://www.ikc.co.jp/technical/bellows/whats_bellows.html

http://mitsumoto-bellows.co.jp/products/bellows-index.html

http://home.a00.itscom.net/shisan12/bellowsfun.htm

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Moisture-Proof Coating Agent

What Is a Moisture-Proof Coating Agent?

Moisture-proof coating agents are used to apply a protective film on surfaces, enhancing their resistance to moisture. They are commonly used on printed circuit boards to create a moisture-proof protective layer.

Uses of Moisture-Proof Coating Agents

Moisture-proof coating agents protect electrical and electronic equipment from moisture, corrosion, and oxidation. They are crucial in preventing malfunctions and failures caused by short circuits, wire breaks, and current leakage. Conformal coating, a method of applying these agents uniformly, shields substrates and components from airborne contaminants.

Fluorinated agents are often preferred for their high moisture resistance, ease of application, and room-temperature drying capabilities.

Principle of Moisture-Proof Coating Agents

These agents work by creating a surface with low tension and repelling water, which has higher surface tension. This causes water to form droplets on the coated surface, ensuring waterproofing. Fluorine-based agents, with their stable C-F bonds, further reduce surface tension, enhancing moisture repellence.

Types of Moisture-Proof Coating Agents

There are several types of moisture-proof coating agents, each with unique properties and applications.

Acrylic and Urethane Types

Used for circuit boards and automotive ECU substrates, acrylic and urethane agents provide effective protection but require thicker films and careful handling due to flammability.

Silicone-Based

Silicone-based agents form flexible, rubber-like films and are versatile, but they can diffuse low-molecular-weight compounds, potentially affecting contact integrity.

Olefin-Based

Olefin-based agents also create rubber-like films with high moisture resistance. Similar to silicone-based agents, they contain organic solvents and necessitate careful handling.

Fluorine-Based

Fluorine-based agents are notable for their thin-film application, high resistance to moisture and acids, and lightweight impact on substrates. They are effective against environmental factors like lithium battery electrolyte exposure and hydrogen sulfide.

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Water and Oil Resistant Coating Agent

What Is a Water- and Oil-Resistant Coating Agent?

Water- and oil-resistant coating agents, typically solutions of dissolved fluoropolymers, are applied to surfaces to impart water- and oil-repellent properties. Easily applied by brushing or dipping, these agents can dry at room temperature.

Uses of Water- and Oil-Resistant Coating Agents

These agents are widely used across various industries and in everyday items that require water and oil repellence. Common applications include enhancing touch panels with water and oil repellence, preventing fingerprints, serving as waterproofing sprays for textiles like silk and cotton, and providing protection for industrial components like bearings in mini motors and barriers in HDD fluid dynamic bearings.

Additionally, they are applied for waterproofing materials such as wood and leather.

Principle of Water and Oil Resistant Coating Agents

The primary component, fluorine, forms stable C-F bonds resulting in low surface tension, making these coatings repellent to water and oil, which have higher surface tensions. This property is quantified as the contact angle, reflecting the wettability of a surface. A larger contact angle indicates superior water and oil repellence.

What Is Super-hydrophobicity?

Super-hydrophobicity refers to an extreme level of water repellence, differentiated from standard water repellence by a higher contact angle.

Types of Water and Oil Resistant Coating Agents

Various types of water- and oil-resistant coating agents exist:

  • Non-flammable solvents: Safe and non-flammable.
  • Water-based coatings: Dilutable with water or alcohol, requiring no curing.
  • Petroleum-based solvents: Offers superior cost performance.

Recent developments include agents without C8 telomere or fluorine, responding to environmental and health concerns related to PFOA impurities in traditional fluorinated agents.

Examples of Water and Oil Resistant Coating Agents

These agents are commonly used in the inkjet printing industry. They prevent ink clogs when applied inside inkjet printer nozzles. Similarly, they are used inside ink cartridges to ensure efficient ink delivery without internal adhesion. Their suitability for plastic components like ink cartridges, without the need for heating or special treatment, makes them especially useful.

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Display Glare Measuring Device

What Is a Display Glare Measuring Device?

A display glare measuring device assesses the degree of glare on the screens of TVs, smartphones, and other devices. This glare, seen as fine bright spots flickering on a display, results from surface irregularities acting as lenses, causing variations in brightness and color. Factors like dirt, sebum, and fine pixel density can exacerbate glare, making accurate quantitative evaluation increasingly important.

Uses of Display Glare Measuring Devices

These devices evaluate glare and resolution characteristics of various displays, including 8K/4K TVs, monitors, projectors, smartphones, tablets, large displays, and in-vehicle systems. They are essential for assessing anti-glare films applied to PCs and smartphone screens, which can also contribute to glare due to surface irregularities affecting light emission.

Principle of Display Glare Measuring Devices

Display glare measuring devices use cameras to photograph the display surface. They measure luminance non-uniformity, calculating a glare rating value based on the glare pattern’s frequency distribution. A lower glare rating indicates less luminance variation and reduced glare. The process involves photographing the display with a CCD camera, then dividing the standard deviation of the luminance distribution by the mean value from the image, displayed as a percentage. The measurement accuracy is influenced by the position of the camera lens aperture and the measurement surface on the display.

Countermeasure Against Display Glare

To mitigate glare, anti-glare films are applied to display surfaces. These films reduce glare from lighting and enhance image contrast. Low glare AG films, suitable for high-definition displays like smartphones, offer smooth touch panel operation and fingerprint resistance, effectively reducing glare even on OLED displays.

Display Glare Measurement Standards

The International Organization for Standardization (ISO) has initiated standardization for display glare contrast measurement.

Manufacturers of Display Glare Measuring Devices

Few manufacturers specialize in display glare measuring devices.

DM&S, a German company, offers the SMS-1000 system, which measures glare and evaluates sharpness, anti-glare, and transmission characteristics, adhering to IEC and ASTM standards. The system is recognized globally for its accuracy and ease of use. Topcon Technohouse Corporation’s SR-5100 2D spectroradiometer spectrally analyzes images and quantitatively evaluates glare and glare contrast, expressing the glare contrast value as a coefficient of variation.

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Display MTF Measurement System

What Is a Display MTF Measurement System?

Display MTF Measurement Systems

A display modulation transfer function (MTF) measurement system is a device for assessing display resolution using MTF, a spatial frequency characteristic of optical systems, commonly found in displays.

Display resolution depends on factors beyond pixel count and scanning lines, such as pixel arrangement, luminance, contrast, gamma characteristics, color reproduction range, color temperature, and white balance. MTF is a theoretically solid method for evaluating overall system resolution, from TV camera lenses to transmission systems, display characteristics, and human visual perception.

Optical property evaluation of displays includes glare, sharpness, anti-glare, and transmission distribution. Sharpness, or the blurriness of an image, is assessed using point spread function (PSF), line spread function (LSF), and amplitude transfer function (MTF).

MTF is plotted against spatial frequency, with higher values indicating better transfer characteristics and less blur.

Uses of Display MTF Measurement Systems

Display MTF measurement systems evaluate the sharpness of displays and their components, serving as vital quality control tools.

They are particularly used for assessing LCD panels in devices like 4K/8K TVs, cell phones, PCs, in-vehicle systems, and measuring instruments. MTF measurement features high accuracy, cost-effectiveness, and ease of operation.

Principle of Display MTF Measurement Systems

In MTF measurement, the input signal from a camera maintains a constant amplitude at high frequencies, with the output amplitude decreasing with increasing frequency. This output is the MTF.

MTF can be measured using three methods: slit, edge, and chart methods.

1. Slit Method

This method involves capturing a metal slit image and performing a Fourier transform. It is primarily used in the United States and requires relatively expensive test devices.

2. Edge Method

The edge method, recommended by the International Electrotechnical Commission (IEC), calculates MTF by Fourier transforming an edge image to obtain the LSF.

3. Chart Method

The chart method captures a square wave test pattern, corrects it to obtain the input/output contrast ratio of a sine wave, and is commonly used in Japan and Europe due to lower test device costs.

Features of Display MTF Measurement Systems

Display MTF measurement systems, combined with a signal generator and a measurement camera, can evaluate display MTF effectively. They can also measure graininess, luminance uniformity, and gradation curve with high accuracy.

Display MTF Measurement Systems Manufacturers

Few manufacturers specialize in display MTF measurement systems.

DM&S, a German company, offers the SMS-1000, measuring glare and evaluating sharpness, anti-glare, and transmission characteristics. Astrodesign Inc. provides the DT series, developed in collaboration with NHK, for real-time MTF measurement of displays. S.S. Giken Co., Ltd. offers the NS-2002 system, evaluating resolution, graininess, and tonality of X-ray display images using MTF.

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Automated Quotation Creation

What Is Automated Quotation Creation?

The manufacturing industry, historically focused on efficiency improvements on the manufacturing floor, now recognizes the potential for significant productivity and workflow enhancements in the sales department. Automated quotation creation has emerged as a key driver for these improvements.

These systems employ AI and other tools to automatically calculate prices and format quotations, addressing inefficiencies in traditional, experience-based quotation processes often undertaken by various levels of staff, including executives.

Automated quotation systems have been developed to address issues such as high-cost quotes and administrative overload on senior staff, hindering future planning and execution.

Key types of automated quotation systems include:

  • Systems that generate quotes based on past machining results.
  • Systems that calculate quotes by inputting machining information into drawing feature elements.

Uses of Automated Quotation Creation

Automated quotation systems replace human experience with AI or logic-based algorithms for quoting manufacturing drawings. This standardizes drawing processes and expedites budgeting, benefiting various industry players, from parts suppliers to large clients and trading companies.

Primary applications span multiple sectors:

Industry

  • Major manufacturers, assembly manufacturers, and parts and material trading companies – Similar drawing searches.
  • Small and medium-sized parts manufacturers – Automatic quotations.

Main Machining Processes in Automatic Quotation

Main Target Fields

  • Industrial machinery.
  • Vehicles.
  • Semiconductor.
  • Home appliances, OA.
  • Medical.
  • Aerospace.

One type of automated quotation system specializes in quote generation with a user-friendly interface, enabling easy and accurate quotations by anyone. Cloud-based management enhances the flow from creation to confirmation.

The other, integrated with ERP, links quotation creation with production and business systems, facilitating communication across departments.

Some systems combine both functionalities, particularly benefiting the manufacturing sector by lowering costs and focusing on core tasks.

Automated systems reduce communication costs compared to traditional methods like fax, ensuring prompt, error-free price transmission via cloud-based management and electronic commerce.

Principles of Automated Quotation Creation

Automated quotation systems generally employ two calculation methods:

  • Calculation based on past machining results.
  • Calculation by inputting machining information into drawing feature elements.

Systems based on past results become increasingly accurate with AI learning, covering most estimates. They offer easy and quick estimation, but may initially lack precision until a sufficient database is built.

The second type, requiring more skill and time due to detailed process calculations, provides high accuracy from the onset.

Both systems should be chosen based on their alignment with a company’s fundamental sales challenges.

Key information for automated quotation includes quotation number, creation date, expiration date, customer name, product unit price, total amount, and past performance data. Additional data varies depending on the system type, with cloud-based systems offering mobile access and training opportunities.

Security considerations are crucial, especially for cloud-managed systems.

Advantages of Automated Quotation Creation

1. Focus on Human Resource Development

Automating quotations frees up time for staff training and knowledge sharing, eliminating reliance on specific individuals for quotation tasks.

2. Improvement of Quotation Accuracy

Systems using past data and AI learning provide more accurate estimates, enabling even novices to create precise quotations.

3. Strengthen Sales and Product Development

EDI-equipped systems help understand product and personnel performance, aiding in resource allocation and informing strategic decisions.

Benefits of Automated Quotation Creation

Automated quotation creation offers diverse benefits across various company roles:

Sales Employee Perspective

  • Reduction in manpower shortages.
  • Decrease in overtime.
  • Increased rate of productive work.

Sales Manager Perspective

  • Quicker quotation responses.
  • Consistency in quotations.
  • Enhanced sales analysis.

Management Perspective

  • Cost reduction.
  • Improved employee satisfaction, aiding recruitment.

Competitive Advantage

  1. Increasing order acceptance by providing faster quotations than competitors.
  2. Reducing labor and SG & A costs through efficient quotation processes.
  3. Accumulating data for accurate pricing, further enhanced by AI learning.
  4. Simplifying quotation creation and submission processes, allowing focus on primary tasks.
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Drawing Search System

What Is a Drawing Search System?

In the manufacturing industry, drawing search systems register and manage company drawings in a database, enabling quick retrieval based on past data.

These systems are predominantly used in sales, design, and procurement departments to streamline the extraction of past drawings.

Recent advancements incorporate AI technology, making these systems simpler, more accurate, and user-friendly for searching reference and similar drawings.

Typically, a drawing search system consists of a PC and a database (DB) server or cloud storage.

By entering master data such as customer, product, quotation information, and prices during the drawing import process, AI learns from past data, allowing multifaceted immediate searches and significant operational improvements.

Many companies still rely on paper-based drawing storage, leading to issues like lost or bulky drawings that are difficult to locate. Drawing search systems address these challenges.

Uses of Drawing Search Systems

Drawing search systems serve two primary purposes:

  • Preventing redundant design and manufacture of similar products.
  • Facilitating rapid budgeting.

Key application areas include:

Industry

  • Large manufacturers.
  • Assembly manufacturers.
  • Parts and materials trading companies.
  • Small and medium-sized parts manufacturers.

Major Machining in Similar Drawing Searches

Main Fields

  • Industrial machinery.
  • Vehicles.
  • Semiconductor.
  • Home appliances, office automation.
  • Medical.
  • Aerospace.

Principles of Drawing Search Systems

Modern systems for similar drawing searches, primarily for PDF 2D drawings, use three major calculation methods.

1. AI-Based Shape Recognition and Calculation

Pros: No human effort; accuracy increases with data volume.
Cons: Requires substantial data.

2. Manual Recognition and Calculation

Pros: Quick calculation of similar products.
Cons: Time and effort-intensive.

3. Model-Based Calculation

Pros: Generally more accurate.
Cons: Cost-benefit analysis required.

Drawings and results are stored on DB servers or, increasingly, cloud services, given server storage limits.

PDF is the prevalent format for importing drawings. Converting paper drawings to PDF for system import streamlines similar drawing searches.

General Procedure for Searching Similar Drawings

  1. Import PDF drawings and enter relevant data.
  2. Drawing search and retrieval – AI displays drawings with similar features or attributes from newly imported drawings.
  3. Utilization of past drawings and data – Visualize past quotes and processes for retrieved drawings. AI feedback improves search accuracy. The system also aggregates data on customer, machine, product, and personnel performance, aiding in loss analysis and resource optimization.
  4. Linking to ordering and production management systems – Extract project data as CSV files for integration with order management systems.

Benefits of Drawing Search Systems

Key benefits of implementing a drawing search system include:

1. Streamlining and Standardizing Design Work

Reusing similar past drawings accelerates design work and reduces the need for scratch designing. The system also facilitates error prevention and supports paperless operations.

2. Expedited Budgeting and Price Quotations

Quick retrieval of drawing and supplier data speeds up budgeting and price adjustments, streamlining the quotation process.

3. Enhancing Production and Sales Efficiency

Data analysis capabilities integrated into production management systems improve productivity, allowing departments to focus on their core functions.

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Factory Digitalization

What Is Factory Digitalization?

Factory digitalization (DX) refers to the use of digital technology to break away from the analog aspects of the manufacturing industry and increase corporate advantage. It is also known as Manufacturing DX.

The term “DX” was coined by a Swedish university professor in 2004.

In Japan, the Ministry of Economy, Trade and Industry (METI) created “Guidelines for Promoting DX” in 2018, and it is spreading throughout the country, but some companies are not familiar with it due to the nature of the manufacturing industry.

In fact, as of 2022, 65% of the manufacturing industry in the U.S. and Germany will have adopted DX, while only 13% of the manufacturing industry in Japan will have done so.

Therefore, the business environment is changing dramatically in Japan’s manufacturing industry today, and the ability to respond flexibly using digital technology is required.

Factory digitalization can sometimes bring about more than improvements in the manufacturing sector by DXing not only the manufacturing sector, but also upstream areas such as development, design, and sales from a strategic point of view.

For example, automation of quotation and extraction of drawings from past results can significantly improve efficiency, reduce SG&A expenses, increase order rates, and build competitive advantage.

Furthermore, feedback from the shop floor (factory) to sales, and from sales to the shop floor, can be used to improve productivity, reduce SG&A and labor costs, and get on with the work that needs to be done.

Uses of Factory Digitalization

There are many examples of factory digitalization, which can be divided into three main categories.

Example 1: Machinery and Equipment Manufacturers, Machine Tool Manufacturers

This is a case in which a single production management system is used to integrate the engineering of machines and automated processes from design to manufacturing, a supply chain that can flexibly respond to production in the face of recent material shortages and rising prices for single parts, and a management system for reusing performance data from human operators for similar products. This is a case of integrating a supply chain that can flexibly handle production in the face of rising prices for parts and materials.

In this case, the system can be more effective in improving and stabilizing quality and preventing accidents due to mistakes.

Case 2: Electrical Equipment Manufacturer

By introducing a system that simplifies and visualizes the business process from the receipt of an order to design, manufacturing, shipping, and delivery of a product at the company’s factory, it is possible to review the flow of order and supply management by paper or e-mail and process management at the factory’s manufacturing site, and to improve the company’s ability to secure human resources and reduce long overtime work. This will also clarify areas for corporate improvement, such as securing human resources and reducing long overtime work.

In other cases, the introduction of a delivery date management system, in which production plans are made in advance in anticipation of the quantities that customers will need in the future and products are not made in excess of what is required, in an environment of material shortages, component prices, and fluctuating prices, has had a significant effect, increasing sales by strengthening internal cooperation systems.

Case 3: Parts Manufacturer and Parts Processor

This is a case study of the most downstream part of the commercial flow.

By creating clear sales figures and data by customer, machine, product, and person in charge, it becomes possible to clearly identify the strengths and weaknesses of the company.

For example, if the order rate for Company A is good, but the order rate for Company B is declining, the company can immediately identify key areas for improvement and take measures for the next time.

In addition, as a common point between 1 and 2, it can improve quality and speed, simplify paper-based communication such as fax, secure human resources, and reduce long hours of overtime work.

Principle of Factory Digitalization

Factory digitalization are about creating new added value by making full use of AI and digitalization, and revolutionizing existing businesses through overwhelming efficiency gains through visualization and automation. It is also about changing the value of the customer experience and transforming it into a better business model.

There is one key point in the process of transformation. This is because it is necessary to proceed with reform gradually, in stages, rather than converting from analog to digital operations all at once.

There are three basic steps.

1. Use of In-House Data

The first step is to collect and analyze data within the company. By attaching sensors or barcodes to each manufacturing facility, machine, order form, etc., or by incorporating process management software, data must be collected to determine the amount of orders received by sales, the time from sales to the manufacturing site, the process at the manufacturing site, and shipping after production, etc.

By analyzing the data, it is possible to reduce unnecessary costs incurred within the company and find factors that may have contributed to quality problems, thereby facilitating improvements.

2. Automatic Improvement for the Next Time

Second, after analyzing data on the factors that caused the problem, digital technology can be used to automatically devise a remedy.

The system automatically derives the precursors to breakdowns and factors that cause quality degradation of machines installed at manufacturing sites using light sensors, temperature sensors, and other devices. As a result, machines can be replaced before they break down and quality can be assured.

3. AI and the Work That Should Be Done by Humans

Third, by delegating to machines and AI all tasks that can be replaced by people, the work that must be done by people can be done by human eyes and hands, and the production site can be reborn as a production site that can efficiently produce new products with stable high quality and create new value.

The Benefits of Factory Digitalization

1. Create New Customer Experiences and Generate Revenue From the Added Value

Factory digitalization makes it easier for executives and managers to conduct analysis that will be useful in the future. The strategies and tactics generated from this analysis can create new value that can expand the scope of differentiation from other companies and emphasize their strengths.

For example, by introducing factory digitalization, salespeople can leave the quotation work to AI and spend their time visiting customers. This allows them to listen to the needs and opinions of their customers.

For design and manufacturing departments, AI can be entrusted with the same tasks as in the sales department, such as estimating, and delivery date management and inventory control can be managed by the system, making it easier to concentrate on the design and development of new products.

2. Focus on Human Resource Development

By delegating tasks that do not necessarily need to be done by humans to machines or AI, more time can be freed up. This time can be used to train new employees.

3. Increase Profits

By analyzing data, it becomes possible to determine the strengths and weaknesses of the company, and to know which products to propose to which customers at which time, making it easier to create an environment that generates profits while increasing productivity.

The above three points are expected to be effective in the implementation of factory digitalization.

This article was supervised by REVOX Corporation, which manufactures and sells Factory DX.

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Hydrogen Inhalation Device

What Is a Hydrogen Inhalation Device?

Hydrogen Inhalation Devices

Hydrogen inhalation devices enable users to inhale hydrogen gas through the nose, increasing hydrogen intake into the body.

These devices come in two varieties: ones that emit only hydrogen gas and others that emit both hydrogen and oxygen gas. They are available for both home and commercial use.

While devices emitting oxygen gas can benefit individuals with severe pneumonia, there’s a concern about lung damage risk in healthy people. Higher flow rates, although not necessarily better for the body, may cause nasal discomfort.

Uses of Hydrogen Inhalation Devices

Hydrogen inhalation devices are utilized in hydrogen inhalation therapy, an advanced medical technology. This therapy aims to improve the neurological condition of patients with post-cardiac arrest syndrome.

It targets patients who have regained their own heartbeat after an out-of-hospital cardiac arrest, specifically those presumed to have experienced a cardiogenic cardiac arrest.

In the intensive care unit, eligible comatose patients, post-resumption of heartbeat, inhale 2% hydrogenated oxygen for 18 hours using a ventilator. This treatment follows intensive care guidelines. The inhalation of hydrogen gas is anticipated to protect brain cells and life, aiding patients’ return to society, a significant medical goal.

Principle of Hydrogen Inhalation Devices

Hydrogen inhalation devices operate based on the following principles:

1. Hydrogen Gas Generation Method

The predominant method for producing high-purity hydrogen is water electrolysis.

An electrolytic tank, containing an anode and cathode separated by an ion-exchange membrane, facilitates this reaction.

For the highest purity hydrogen, platinum catalyst electrodes are used. Continuous voltage application to these electrodes triggers water electrolysis.

At the anode, water molecules lose electrons, producing oxygen molecules and hydrogen ions. The generated oxygen is safely released into the atmosphere from the generator‘s rear.

Hydrogen ions, passing through the ion-exchange membrane to the cathode, combine with electrons to form hydrogen molecules. The membrane separates hydrogen from oxygen, allowing only hydrogen molecules to pass through.

2. Inhalation Method

The advanced medical technology-certified method uses a nasal cannula. This cannula, typically 3 to 5 mm in diameter, is the thinnest type and is inserted into the trachea through the nasal cavity.

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Vacuum Circuit Breakers

What Is a Vacuum Circuit Breaker?

Vacuum circuit breakers (VCBs) are devices used to interrupt circuits during malfunctions in equipment or power systems.

Capable of interrupting all current types, including short-circuit, load, and overcurrent, VCBs excel in performance among circuit breakers. In the event of current surges reaching several thousand to tens of thousands of amperes, VCBs can extinguish the arc discharge and break the circuit. They are commonly used in large-scale, high-voltage power receiving and transforming facilities.

Uses of Vacuum Circuit Breakers

VCBs protect circuits from accidental currents and break circuits during abnormal currents. Preferred in high current scenarios, they are a cost-effective choice for high-voltage substations’ switchboards. Typical installations include substations, large factories, and commercial facilities.

As VCBs alone cannot detect abnormal currents, they are typically paired with an overcurrent relay for signal reception and automatic current interruption.

Principle of Vacuum Circuit Breakers

VCBs contain a vacuum valve with high vacuum levels, ranging from 10-3Pa to 10-5Pa. The valve includes two fixed and two movable electrodes forming a contact point, separating upon detection of abnormalities.

Interrupting the current requires separating the circuit contacts, generating an arc flash. To prevent potential fires or damage from arc discharge at high temperatures, VCBs use a vacuum environment to diffuse and extinguish arcs. When the electrodes in the vacuum valve separate, the arc dissipates spontaneously.

Regular maintenance of the vacuum valve mechanism in VCBs is essential to ensure reliability during emergencies. Unlike fuses that require replacement after each use, VCBs are reusable and notably quiet during operation.

Types of Vacuum Circuit Breakers

VCBs come in two types: fixed and pull-out, with variations including manual and electric spring types.

Differences in Mounting Method

Fixed VCBs are mounted directly onto the panel with N, R, and P installation directions. Compact yet requiring primary and secondary power shutdown for maintenance or breakdowns, they differ from pull-out VCBs, which are mounted on wheels for easy main circuit connection and disconnection. Pull-out VCBs simplify maintenance by only needing secondary side disconnection and are generally more expensive.

Differences Between Spring Types

VCBs use springs to physically break contacts. Manual spring VCBs involves energizing a mainspring by turning a handle, while the electric spring type employs a motor for spring loading. The electric variant is typically more costly. In both, the contacts remain open post-activation, requiring spring re-loading for restoration.

Other Variants

There are also tank VCBs, which are partially vacuumed gas circuit breakers used in larger substations.

How to Select Vacuum Circuit Breakers

When selecting VCBs, consider the rated interrupting current and capacity, ensuring they match the equipment’s requirements without exceeding the circuit’s short-circuit interrupting current. Overestimating this current can lead to accidents. This current can be provided by the power company or calculated considering wiring impedance.

Also, ensure the selected model fits the distribution panel’s shape.