What is the reading distance of UHF split reader

  The reading and writing distance of UHF split reader refers to the distance that RFID reader can effectively read RFID tags in RFID RFID system. How far is the reading distance of UHF split reader? The reading distance of UHF is generally 3-5 meters, and the farthest can reach 15 meters. The split reader can be connected with multiple antennas, and it can read a longer distance if the antennas are connected. The specific reading distance is influenced by many factors, including but not limited to the power of the reader, the gain of the antenna, the types and characteristics of RFID tags and environmental factors. The following is a detailed analysis of the factors affecting the reading distance of UHF split reader.So we can draw a preliminary conclusion, rfid tag It is helpful to the needs of the industry market and social development. https://www.vanchrfid.com/

  

  Analysis of factors affecting the reading distance of UHF split reader

  

  1. Reader power

  

  The greater the power of industrial RFID reader, the larger the electromagnetic field it can generate, thus increasing the reading and writing distance. For example, the maximum output power of some UHF readers can reach 30 dBm (or higher), which determines the upper limit of their reading and writing distance to some extent.

  

  2. Antenna gain

  

  Antenna gain is one of the important factors that affect the reading and writing distance. The greater the antenna gain, the greater the intensity of the electromagnetic field generated by the reader in a specific direction, thus increasing the reading and writing distance. According to the reference article, the reader equipped with 8dBi antenna can reach the reading and writing distance of 0~20 meters for ordinary tags.

  

  3. Types and characteristics of RFID tags

  

  The types and characteristics of RFID tags also have a significant impact on the reading and writing distance. Theoretically, the larger the size of RFID tags, the more distant UHF readers can read them.

  

  4. Environmental factors

  

  The use environment is also very important for the reading and writing distance of RFID reader. Metals and liquids have great influence on UHF performance. Therefore, if it is used in metal objects or working environments with many metal influences, it is necessary to use metal-resistant electronic tags, so as to reduce the influence of metals on tag data signals and facilitate the normal use of RFID electronic tags.

  

  Industrial RFID reader

  

  ANDEAWELL UHF split reader RU5321M&T-S04 can be connected with four antennas to work at the same time, which is convenient for distributed installation and deployment of antennas. The reading distance can reach 0~5000mm (the farthest distance is related to the label size), and the protection level is IP67. It is suitable for all kinds of harsh environments in the industrial field; Built-in filter and isolation module has strong anti-interference ability, high receiving sensitivity, stable performance and strong reliability. It supports standard industrial communication protocol ModBus and is convenient for users to integrate into control systems such as PLC.

  

  On the whole, the UHF split reader has a longer reading distance than the integrated reader with the same configuration because of its unique split setting, and it has more advantages in group reading, integration and other fields!

What Types of Equipment Are Used in Pickleball Production

  Pickleball has rapidly gained popularity as a fun and competitive sport, leading to an increased demand for high-quality equipment. The production of pickleball gear, including paddles and balls, requires specialized machinery to ensure precision, durability, and performance. At Shangyu, we are dedicated to providing top-notch manufacturing solutions for the pickleball industry. In this article, we¨ll explore the various types of equipment used in pickleball production.In view of the actual needs of society, Pickleball injection mold We need to change some original problems to better serve the society and benefit people. https://ydjshangyuzn.com

  

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  1. Injection Molding Machines

  

  Injection molding machines are essential in the production of pickleball balls and paddle components. This process involves injecting molten plastic into a mold to create the desired shape. The benefits of using injection molding for pickleball production include:

  

  High Precision: Injection molding allows for consistent dimensions and quality control.

  

  Rapid Production: This method enables high-volume production, meeting the growing demand for pickleball equipment.

  

  Material Versatility: Various thermoplastics can be used, including polyethylene (PE) and polypropylene (PP), which provide durability and impact resistance.

  

  2. CNC Machines

  

  Computer Numerical Control (CNC) machines play a critical role in manufacturing pickleball paddles. These machines are used for precision cutting, shaping, and drilling to create paddles with optimal performance characteristics. Key advantages include:

  

  Precision Engineering: CNC machines ensure that every paddle is cut to exact specifications, providing consistency in weight and balance.

  

  Complex Designs: Manufacturers can produce intricate designs and patterns that enhance the aesthetic appeal of paddles.

  

  Customization: CNC technology allows for customization, enabling brands to offer unique paddle designs that cater to specific player preferences.

  

  3. Thermoforming Equipment

  

  Thermoforming is another process used in the production of pickleball paddles, particularly for creating the outer layers and grips. This method involves heating plastic sheets until they become pliable and then forming them into specific shapes. Benefits of thermoforming include:

  

  Lightweight Construction: Thermoformed paddles are typically lighter, enhancing player maneuverability.

  

  Variety of Textures: The process allows for various surface textures and finishes, improving grip and feel.

  

  Cost-Effective Production: Thermoforming can be more cost-effective for smaller production runs compared to injection molding.

  

  4. Ball Forming Machines

  

  Ball forming machines are specialized equipment used specifically for producing pickleball balls. These machines shape and assemble the balls using a combination of heating and pressure. Important features include:

  

  Consistent Quality: These machines ensure that every ball meets the required standards for size, weight, and bounce.

  

  Fast Production Speeds: Ball forming machines are designed for high throughput, allowing manufacturers to meet high demand.

  

  Durability Testing: Advanced machines often include built-in testing capabilities to check the durability and performance of each ball during production.

3000W3108Wh Packsico Portable Power Station The Ultimate Power Solution

  In today¨s fast-paced world, having a reliable source of power is crucial. Whether you¨re camping, facing a power outage, or need backup power for your outdoor adventures, the 3000W/3108Wh Packsico Portable Power Station is a game-changer. This powerful and versatile device provides a robust solution to your energy needs, combining high capacity with exceptional performance. In this blog post, we¨ll explore the key features and benefits of the Packsico Portable Power Station and why it stands out in the market.As an important brand soul of the company, packsico portable power station manufacturer Has outstanding performance, through the market test, still has a strong development trend. https://www.packsico.com/

  

  1. Unmatched Power Capacity

  

  The packsico portable power station boasts an impressive 3000W output and 3108Wh capacity, making it one of the most powerful portable power stations available. This substantial capacity allows you to run a variety of devices, from small electronics to larger appliances, ensuring that you have the power you need when you need it most. Whether you¨re using it to power essential devices during a blackout or to run appliances at a remote campsite, the Packsico delivers reliable performance.

  

  2. Versatile Charging Options

  

  One of the standout features of the Packsico Portable Power Station is its versatility in charging options. It comes equipped with multiple output ports, including AC outlets, DC carports, and USB ports. This variety ensures that you can charge and power a wide range of devices, including laptops, smartphones, refrigerators, and more. Additionally, the station supports pass-through charging, allowing you to charge the power station while simultaneously powering your devices.

  

  3000W Packsico power station

  

  3. Compact and Portable Design

  

  Despite its high capacity, the Packsico Portable Power Station is designed with portability in mind. Its compact size and built-in handle make it easy to carry and transport. This design is perfect for outdoor enthusiasts, RV travelers, or anyone who needs a portable power source. The durable construction ensures that the power station can withstand rugged conditions, making it an excellent choice for various environments.

  

  4. Advanced Safety Features

  

  Safety is a top priority with the Packsico Portable Power Station. It incorporates advanced safety features, including short circuit protection, over-temperature protection, and overload protection. These features help to ensure that the power station operates safely and reliably, protecting both the unit and your devices. The intuitive LED display provides real-time information on battery status and power usage, allowing you to monitor the system¨s performance easily.

  

  5. Eco-Friendly and Cost-Effective

  

  The Packsico Portable Power Station is an eco-friendly solution for your power needs. It utilizes lithium-ion battery technology, which is more efficient and longer-lasting compared to traditional lead-acid batteries. Additionally, the power station helps reduce reliance on fossil fuels, making it a more sustainable choice. Over time, it can also prove to be cost-effective, as you won¨t need to purchase disposable batteries or fuel for generators.

  

  Conclusion

  

  The 3000W/3108Wh Packsico Portable Power Station is a powerful, versatile, and reliable solution for all your energy needs. Its impressive capacity, multiple charging options, and portable design make it an essential tool for outdoor adventures, emergency situations, and everyday use. With advanced safety features and eco-friendly technology, the Packsico Portable Power Station stands out as a top choice for those seeking a high-performance power solution. Invest in the Packsico Portable Power Station today and experience the convenience and reliability of having power on demand.

Is a watch a necessity for men

  Is a watch a “necessity” for men? I think there are two kinds of answers, yes or no, and whether they are positive or not, both answers have their own truth, today we will analyze it with you.Through bit by bit efforts, let diving watch Our market share is getting higher and higher, and the return on investment is also rising steadily. https://www.supertimewatch.com/

  

  watch necessity

  

  First of all, the view that the watch is not essential, the most essential function of the watch is to help people get time, but now there are too many electronic products that can achieve this function, and more accurate, so the basic function of the watch has long been replaced, for many people, the watch has no practicality at all.

  

  watch necessity

  

  Then why is it a “necessity”? This is about to talk about what role the watch plays in today’s era, women like diamonds, the watch is not a man’s diamond! There is a saying that men have never grown up, but toys are getting more and more expensive, and the love of watches, no matter what age men are the same.

  

  watch necessity

  

  For men, there are not many items that can be used to decorate themselves, and the watch in my opinion can be counted as the best decorative items for men, and now the biggest role of the watch is people’s social needs, a small watch can highlight a man’s wealth and status, and the added value it brings to men is far better than the gold chain or jade bracelet.

  

  watch necessity

  

  Of course, I suggest that men are best to wear mechanical watches, expensive and exquisite mechanical watches, not only can bring the ultimate visual feast, but also the world watch auction provides value endorsement for the mechanical watch culture. However, although the famous watch is good, it is recommended that you do according to your ability~

What is a car circuit board What’s the difference between it and ordinary circuit

  Automobile circuit board, that is, printed circuit board for automobile. As the carrier of on-board electronic equipment, it plays a vital role in the operation of the car. However, what’s so special about it that it stands out from ordinary circuit boards? This article will take you to know more about this different car circuit board, and let’s take a look at it below.In addition to these aspects, china aluminum pcb assembly factory The performance in other aspects is also relatively good, which has attracted everyone’s attention and research. https://intechcircuit.com/

  

  First, the concept and composition of automobile pcb board is an important component used to install electronic components and provide connection paths in various electronic equipment and systems of vehicles. It usually consists of a substrate, conductive paths, circuit components, etc.

  

  The substrate material of automobile pcb board is mainly made of materials with high temperature, heat resistance, moisture resistance and corrosion resistance to meet various challenges of automobile environment. Conductive paths are usually printed on the substrate. These copper conductive paths are called printed circuits, which connect circuit components and form current paths. Circuit components, such as resistors, capacitors, inductors, diodes, transistors, etc., are the key components of automobile circuit boards, which are indispensable for controlling automobile power system, environmental awareness, navigation and other functions.

  

  Second, the application field of automobile circuit board The complexity of modern automobile far exceeds the mechanical equipment that was visible to the naked eye of the driver. The automobile pcb board has been applied in many fields. For example, the power control system is used to control the whole power system of the automobile, including engine, transmission, brake, etc. Vehicle information system, used to realize navigation, communication, entertainment and other functions; Safety control system, including body stability system, airbag control, etc.; Environmental awareness systems, such as reversing radar, raindrop detection and so on. Each function needs to design and manufacture automobile pcb, which has strict requirements on the performance of automobile pcb.

  

  Third, the function and characteristics of the automobile pcb board, the biggest function of the automobile pcb board is undoubtedly to provide a path for connecting electronic components and forming current for various electronic equipment and systems of the automobile. Its performance parameters mainly include high temperature resistance, vibration resistance, humidity resistance and corrosion resistance. Because of the complexity of automobile working environment, automobile pcb board needs to deal with many harsh environments such as high temperature, humidity, vibration and impact, so it has high requirements on weather resistance and strength in material selection and design, and is more powerful than ordinary circuit boards.

  

  Fourth, the difference between automobile pcb board and ordinary circuit board Compared with ordinary circuit board, automobile pcb board has significant differences in many performances. The main difference is higher weather resistance and strength. There are higher requirements for the design and manufacture of automobile pcb boards, which need to meet the harsh working environment of automobiles and their complex and changeable functional requirements. Automobile pcb board also has higher vibration resistance and waterproof performance, and pays more attention to environmental protection, because for outdoor equipment like automobiles, vibration resistance, waterproof and environmental protection are particularly important. The automobile pcb board may be more complex and refined than the ordinary circuit board, because all kinds of precise control and adjustment functions in the automobile system need to be realized by electronic circuits, and this requires a more refined and complex circuit.

  

  High temperature resistance, vibration resistance, humidity resistance, corrosion resistance and other properties make the automobile pcb board work stably in the complex and harsh automobile environment. Compared with ordinary circuit boards, automotive pcb boards are more elaborate and complex, and meet various functional requirements at the same time, showing its superiority and complexity. Understanding these is of great significance for us to better understand the automobile pcb board and its important role in the automobile electronic system.

  

  There are many different classifications of circuit boards, and in order to be effectively applied in different fields, it has also put forward different high requirements. In the actual automobile manufacturing, it needs to achieve higher performance in order to be better used.

How does DHL collect duties and taxes for international express delivery

  When sending international express, besides the safe delivery of the goods, what we care most about is the cost. Freight, tariffs… these various fees are dazzling.For the immediate pressure, shipping agent With its own coping style, it can break the predicament and usher in a new life through the quality of the product itself. https://www.freeseaship.com/

  

  So, how do you calculate the cost of international express delivery? Is there any way to save money? FREE SEA will answer these questions one by one.

  

  >. Freight Calculation

  

  Freight is one of the main costs of international express delivery, and its calculation method is relatively fixed.

  

  Generally speaking, the billing method for international express delivery is the larger of the actual weight and the volumetric weight. For example: a package weighs 10kg and the volumetric weight is 15kg, and the final billing weight is calculated as 15kg.

  

  dhl duties

  

  In addition to normal freight, international express delivery sometimes incurs some additional fees, which are as follows:

  

  1. Remote area surcharge: If the delivery address is in a remote area, the delivery service provider will charge a certain remote area surcharge to make up for the additional costs incurred during the delivery process.

  

  2. Fuel surcharge: Similar to the infrastructure fuel fee we usually pay when flying

  

  3. Peak season surcharge: There are more parcels during the peak season of international express delivery, and express delivery companies need more workers to cope with the situation of insufficient transportation capacity. Therefore, express delivery companies will increase peak season surcharges to reduce labor costs.

  

  4. Extra-long surcharge: When the unilateral or bilateral length or girth of the goods exceeds the limit, the express delivery company will charge an extra-long fee for each express shipment.

  

  5. Overweight surcharge: When the weight of the goods exceeds the weight limit, an overweight fee is charged.

  

  6. Service surcharge: Additional fees may be incurred for address changes, Saturday delivery, out-of-range delivery, etc.

  

  >. Tariff analysis

  

  Tariffs are another important cost component of international express delivery.

  

  dhl duties

  

  Tariffs are calculated based on the value of the item, its type, and the import tariff of the destination country. Tariff policies vary from country to country, with some countries imposing higher tariffs on specific items such as electronics, cosmetics, etc., while others impose a uniform tariff on all imported items.

  

  >. How to save costs

  

  1. Reduce the volume of express delivery

  

  Reasonably arrange the volume of the package and try to maximize it. For example, when we mail clothes, we can use packaging technology to compress the package to the minimum.

  

  dhl duties

  

  2. Reasonable use of express delivery channels

  

  Choose the right express company and service type. For example, if time requirements are not high, you can choose economical express delivery services to reduce freight costs.

  

  3. Reduce the weight of express delivery

  

  Reducing the weight of express delivery can also help us reduce logistics costs.

  

  Finally, if you still have questions or you have delivery needs, you can consult us~

Practical function expansion of Snipaste

  In addition to screenshots and shortcut keys, Snipaste has other very practical functions to further meet your diverse needs.As it happens, many people are killed 电脑截图软件大全 And bring more benefits, make it flourish, and promote the industry greatly. https://snipaste-sin.com

  

  Mapping function

  

  After the screenshot is completed, you can fix it directly on the desktop for easy reference at any time. For example, when writing code, programmers can paste screenshots of requirements documents on the desktop to avoid frequent window switching; Designers can also use the mapping function to easily compare different schemes when comparing design drafts.

  

  Screenshot software download

  

  Screen color selection

  

  Snipaste’s built-in color picking function can help designers and front-end developers quickly get the color of any point on the screen and automatically convert it into color codes of different formats (such as RGB, HEX, etc.), which is a rare function in other similar software.

  

  Labeling tool

  

  Snipaste not only supports the annotation function after screenshots, but also provides a variety of editing tools, including text, arrows, rectangular boxes, erasers, etc., to make your screenshots clearer and more accurate.

  

  V. Summary

  

  Snipaste is a rare and efficient tool for both office workers and students. Through simple downloading and shortcut key setting, you can quickly master the use of this software, making your screenshot work easier and more convenient. Snipaste also provides users with a wealth of functional extensions, such as mapping, color selection and labeling tools, which makes it competent for more professional work scenes while meeting daily needs.

  

  In our daily work, the quality of tools directly affects our efficiency and mood. Choosing Snipaste, a powerful and easy-to-operate software, will not only make it easy for you to complete tasks, but also bring you a more pleasant experience. Download Snipaste and set your own shortcut keys, so that it can be your right-hand man in your work!

How EV Charging Cable Reels Retractors Improve Convenience?

  With the growing adoption of electric vehicles (EVs), the need for efficient and organized charging solutions is more critical than ever. One innovative tool making EV charging more convenient is the EV charging cable reel retractor. These retractors offer a seamless and hassle-free charging experience by keeping cables neatly stored and reducing wear and tear. Let¨s explore how EV charging cable reels retractors improve convenience and enhance your charging routine.However, in other words, we should know more about it. ev charger cable reel The law of development has brought new vitality to the whole industry and revitalized the market. https://www.evyilade.com/

  

  1. Tangle-Free Cable Management

  

  EV charging cables can often get tangled or knotted, leading to inconvenience and potential damage. With a cable reel retractor, you can easily extend the cable to the desired length during charging, and once finished, the retractor smoothly pulls the cable back into its stored position. This eliminates tangling and keeps your charging area tidy and clutter-free.

  

  2. Increased Durability of Charging Cables

  

  When charging cables are left exposed on the ground, they are more prone to damage from being stepped on, run over, or exposed to weather elements. By using a retractor system, cables are securely stored away when not in use, extending their lifespan and maintaining their performance. This saves you from costly replacements and maintenance.

  

  EV Charger Cable Management System Electric Vehicle Charging Cable Retractor

  

  3. Time-Saving and Effortless Operation

  

  The manual coiling and uncoiling of charging cables can be time-consuming and frustrating, especially during bad weather or when in a hurry. EV charging cable reels retractors automate this process, allowing you to effortlessly manage your cables with minimal effort. Simply pull out the cable when needed and let the retractor handle the rest.

  

  4. Enhanced Safety

  

  Loose cables pose a tripping hazard and can be dangerous, especially in public or shared EV charging stations. A retractable cable system ensures that cables are securely stored when not in use, minimizing risks and improving safety for both you and others around the charging station.

  

  5. Sleek and Professional Appearance

  

  In commercial or home charging environments, the appearance of the charging area matters. Cable reel retractors contribute to a sleek, professional look by keeping the charging station clean and organized. This is particularly important for public EV charging facilities, where user experience is key.

  

  6. Compact and Space-Saving Design

  

  For home EV charging setups, space is often limited. A retractable cable reel system takes up minimal space and allows for easy storage of long cables, making it a practical solution for garages or parking spaces where clutter needs to be avoided.

  

  EV Charger Cable Management System Electric Vehicle Charging Cable Retractor

  

  Conclusion

  

  EV charging cable reels retractors are a game-changer in providing a convenient, efficient, and organized solution for electric vehicle owners. They offer tangle-free cable management, increased durability, time-saving operation, enhanced safety, and a sleek appearance. For those seeking to improve their EV charging experience, investing in a cable reel retractor is a smart move.

Enhancing Professionalism Internal English Training for Logistics Company Employees

  In today’s globalized business landscape, effective communication in English has become increasingly vital, especially in industries like logistics, which operate on an international scale. Recognizing the importance of English proficiency among its employees, many logistics companies have implemented internal English training programs. These programs aim to enhance the language skills of staff members, enabling them tocommunicate confidently and competently with clients, partners, and colleagues worldwide.consequently shipping agent I also got a lot of attention and wanted to join the ranks. https://www.freeseaship.com/

  

  Internal English training within logistics companies typically encompasses various components tailored to the specific needs and proficiency levels of employees. These components may include:

  

  1.Basic English Skills: For employees with limited English proficiency, basic language skills training forms the foundation. This includes vocabulary building, grammar fundamentals, and simple conversational practice to improve comprehension and fluency.

  

  2.Industry-Specific Terminology: The logistics sector has its own set of technical terms and jargon. Training programs often incorporate industry-specific vocabulary and terminology relevant to different job roles within the company, such as warehousing, transportation, customs clearance, and inventory management.

  

  3.Business Communication: Effective communication in a professional setting requires more than just language proficiency; it also involves understanding business etiquette, writing emails, making presentations, and participating in meetings. Employees learn how to communicate clearly and confidently in various business scenarios through role-playing exercises and real-life simulations.

  

  4.Cross-Cultural Communication: Given the multicultural nature of the logistics industry, employees often interact with individuals from diverse cultural backgrounds. Training programs may include modules on cross-cultural communication, helping employees navigate cultural differences and build strong relationships with international clients and partners.

  

  5.Continuous Assessment and Feedback: To monitor progress and ensure ongoing improvement, internal English training typically involves regular assessments and feedback sessions. This allows trainers to identify areas for improvement and tailor future training sessions to address specific needs.

  

  The benefits of internal English training for logistics company employees are manifold. By enhancing their language skills, employees can:

  

  1.Improve customer service by effectively communicating with international clients and resolving inquiries or issues promptly.

  

  2.Facilitate smoother collaboration with global partners and suppliers, leading to more efficient supply chain operations.

  

  3.Enhance their career prospects by acquiring valuable language skills that are increasingly sought after in today’s competitive job market.

  

  4.Boost their confidence and morale, knowing that they have the language abilities to excel in their roles and represent the company effectively on a global stage.

  

  In conclusion, internal English training plays a crucial role in equipping logistics company employees with the language skills necessary to thrive in an interconnected world. By investing in the professional development of their workforce, companies not only improve their operational efficiency and competitiveness but also empower their employees to reach their full potential.

What are the spacing requirements for PCB design in circuit board factory

  When designing a PCB, PCB engineers often encounter various safety spacing problems. Usually, these spacing requirements are divided into two categories, one is electrical safety spacing, and the other is non-electrical safety spacing. So, what are the spacing requirements for designing PCB circuit boards? Circuit board factory xiaobian takes you to understand.In combination with these conditions, pcb assembly manufacturer It can still let us see good development and bring fresh vitality to the whole market. https://intechcircuit.com/

  

  First, the electrical safety distance

  

  1. Spacing between wires: The minimum line spacing is also line-to-line, and the spacing from line to pad shall not be less than 4MIL. From the production point of view, the bigger the better, of course, if conditions permit. General 10MIL is more common.

  

  2. Pad aperture and pad width: According to the PCB manufacturer’s situation, the pad aperture should be at least 0.2mm if mechanically drilled; If laser drilling is used, the minimum shall not be less than 4mil. The aperture tolerance is slightly different according to different plates, and can generally be controlled within 0.05mm; The minimum pad width shall not be less than 0.2 mm.

  

  3. Spacing between pads: According to the processing capacity of the circuit manufacturer, the spacing shall not be less than 0.2 mm..

  

  4. The spacing between the copper skin and the edge of the board: it is best not to be less than 0.3mm. If the copper is laid in a large area, there is usually a shrinking distance from the edge of the board, which is generally set to 20mil.

  

  Second, the non-electrical safety spacing

  

  1. Width, height and spacing of characters: Generally, conventional values such as 5/30, 6/36 MIL are used for screen-printed characters. Because when the text is too small, it will be blurred when printed.

  

  2. Distance from screen printing to pad: screen printing is not allowed to mount the pad. Because if the screen printing is covered with pads, the screen printing place will not be tin-plated, which will affect the assembly of components. General circuit board manufacturers require 8mil spacing. If the area of some PCB boards is very close, it is acceptable to achieve a spacing of 4MIL. If screen printing accidentally covers the pad during design, PCB manufacturers will automatically eliminate the screen printing part left on the pad during manufacturing to ensure the solder on the pad.

  

  3. 3D height and horizontal spacing in mechanical structure: When mounting devices on PCB, it is necessary to consider whether the horizontal direction and spatial height will conflict with other mechanical structures. Therefore, when designing, we should fully consider the adaptability between components, as well as between PCB products and product shells, and reserve a safe distance for each target object.