1. The role and limitations of lightning rods

Intercepting direct lightning strikes: Lightning rods attract lightning through tip discharge and safely conduct lightning current into the earth through down conductors, protecting building structures from damage by direct lightning strikes.

Limited protection range: The protection range of a lightning rod depends on its height and rolling ball radius, and it cannot cover all possible lightning strike paths.

No protection against induced lightning and surges: When lightning strikes occur, even if the lightning rod successfully conducts the lightning current, the strong lightning current will still induce transient overvoltage (surge) in nearby wires (such as power lines and signal lines). These surges can enter the building through the lines, damage electronic equipment, and cause electrical fires.

2. The core role of SPD

Discharge surge energy: SPD limits transient overvoltage in the line to a safe level through rapid response (nanosecond level) and discharges excess energy to the ground.

Protect sensitive equipment: Prevent power surges from damaging computers, home appliances, communication equipment, etc. through power and communication lines (even if the building is not directly struck by lightning).

T1 SPD: Installed at the incoming line end of a building (such as the main distribution cabinet) to deal with high-energy surges introduced by direct lightning strikes.

T2 SPD: Installed in the distribution cabinet or at the front end of the equipment to further limit the residual pressure and protect the terminal equipment.

3. Collaborative protection of lightning rod and SPD

External lightning protection + internal lightning protection：

Lightning rod (external lightning protection): responsible for intercepting direct lightning strikes and protecting the building structure.

SPD (internal lightning protection): responsible for eliminating induced lightning and surges, protecting electrical systems and equipment.

Actual scenario example：

The lightning current enters the ground through the down conductor, but it will generate an induced surge in nearby conductors. Without SPD, power surges may enter the room along the power lines, burning out electrical appliances or causing fires. When lightning does not directly strike the target building: when lightning strikes the nearby ground, buildings, or discharges between clouds, the changing electromagnetic field induces overvoltage on the power grid conductor, and SPD can protect against such surges.

1. Required bythe standard

1）Required by the standard, the national standard is mandatory

GB 50057 Design code for protection of Structures against lightning：

Article 4.5.4 clearly requires that lightning protection devices should be inspected regularly, generally once a year;toflammable and explosive places, the inspection cycle needs to be shortened to once every six months.

Article 6.4.3 stipulates that the grounding resistance value must meet the design requirements (usually ≤10Ω, ≤4Ω in important places), otherwise rectification is required.

2）Industry norms and legal basis

"Work Safety Law": requires enterprises to fulfill their primary responsibility for lightning protection safety, and those who fail to conduct regular inspections and cause accidents must bear legal responsibility.

IEC 62305 series of standards: The International Electrotechnical Commission emphasizes that lightning protection systems must be periodically tested to ensure their effectiveness, especially in areas with high incidence of lightning.

2. Actual on-site requirements

1）Prevent direct damage from lightning strikes

Fire and explosion risks: Lightning strikes can directly ignite flammable materials in places such as gas stations and chemical plants. Testing ground resistance and equipotential bonding can eliminate potential spark discharges.

Structural safety: Corrosion or breakage of lightning arresters may result in the inability to safely discharge lightning current, causing damage to buildings.

2）Protect equipment and systems

Vulnerability of electronic equipment: Lightning strikes or power surges can damage precision equipment such as servers and medical devices. Testing SPD performance (such as residual voltage and leakage current) can ensure that it effectively limits voltage.

Power system stability: Detection of shielding and wiring compliance of distribution lines can reduce the impact of lightning-induced overvoltage on the power grid.

3）Adapt to environmental changes

Facility aging: Grounding corrosion and SPD component degradation are inevitable over time, and regular inspections can help replace failed components in a timely manner.

Site renovation: Building expansion or use change may damage the original lightning protection system, requiring reassessment of lightning protection level and adjustment of configuration.

4）Necessary needs for special places

Communication base stations and data centers: The high reliability of the lightning protection system must be ensured to avoid business interruption and data loss.

Hospitals and airports: Lightning protection failure may threaten life safety, and detection is a core measure to ensure the uninterrupted operation of critical facilities.

3. Undetected potential risks

1）Legal liability and economic compensation

If a lightning strike accident occurs due to failure to detectit, the company may face administrative penalties, civil compensation or even criminal liability (such as major safety accident crime).

2) Hidden safety risks

For example, if the grounding resistance exceeds the standard but is not discovered, the current cannot be effectively discharged when lightning strikes, which may cause step voltage electric shock or equipment damage.

3) Shortened equipment life

The leakage current of an SPD that has not been detected for a long time will increase, which may accelerate aging and eventually lose its protective function, causing frequent equipment failures.

Multi-function stone cutting machine is an efficient processing machine integrating cutting, chamfering and grooving, designed for tiles, slate, stone and other materials. Its intelligent operation and precise cutting ability make it an ideal choice for the building and decoration and stone processing industries. The Portable Stone Cutting Machine adopts a folding design and is equipped with rollers at the bottom, making it easy to move and store, which greatly enhances the flexibility of the workplace. Widely used in: construction and decoration projects, tile and stone processing plants.

Core Features

Intelligent full-automatic one-button control: simplifies the operation process and lowers the threshold of use, so even novices can get started quickly.

Water jet dust-free cutting recirculating water replenishment system: effectively reduce dust pollution and create a healthier working environment, while the recirculating water design saves water resources.

0-11cm adjustable cutting thickness: adapting to the needs of different thicknesses of materials, from thin tiles to thick slabs can be easily dealt with.

Infrared laser positioning system: Ensure cutting precision with minimal error to meet high standard processing requirements.

45-degree chamfer: realize multi-angle cutting, quickly clamp the stone and improve work efficiency.

Advantages of multifunctional portable stone cutting machine
High efficiency: compared with the traditional cutting method, the working efficiency is increased by more than 50%.

High accuracy: laser positioning system ensures accurate cutting every time.

Multi-functionality: one machine meets the needs of cutting, chamfering, grooving and so on.

Environmentally friendly design: water circulation system reduces dust pollution and meets modern environmental requirements.

Strong durability: High-strength steel plate structure ensures long-term stable operation of the equipment.

Whether you are a professional stone processor or a DIY enthusiast doing home renovation, this multifunctional marble cutting machine can provide you with efficient and accurate processing solutions. Its intelligent operation and diversified function design will greatly improve your work efficiency and ensure the processing quality.

The multifunctional 45-degree stone chamfering machine is very noteworthy. The advanced technology and innovative design of this machine can chamfer the edges of stones at an angle of 45 degrees. It can be applied to various stone materials, such as marble, granite and quartz. The emergence of this machine makes stone chamfering simpler and more efficient.



The advantages of the multifunctional stone chamfering machine are not only reflected in the flexibility of its chamfering angle. It also has multiple functions, such as chamfering, polishing and repairing. Through the stone chamfering machine, multiple stone processing steps can be completed at one time, reducing the time and labor costs of traditional processing methods. This enables stone processing plants to produce more efficiently and provide better quality and more beautiful stone products.



In addition, the stone slab chamfering machine is also an important tool for modern stone processing. It is specially used for chamfering large stone slabs. This machine usually has automation functions, which can accurately control the movement and angle of the tool to ensure the consistency and accuracy of the chamfer. The emergence of stone slab chamfering machines has greatly improved the efficiency and quality of stone slab production.

SMT provides you with the latest technology multifunctional stone chamfering machine, which is suitable for building panels such as rock slabs, tiles, marble, artificial stone, granite, cement products, etc. It is an ideal equipment for small and medium-sized home improvement factories and processing stores. Welcome to contact us.

A CNC Stone Router is a computer-controlled cutting machine related to stone engraving machines used to cut a variety of hard materials. They are essential machines for many stone engraving applications.

The main components of a CNC engraving machine include a dedicated software system, a controller (and its drivers), a cutting table and engraver spindle, and coolant to ensure the longevity of the tool.

The software is the brains of the operation, responsible for translating the digital design into physical coordinates for the machine to follow. The most common types are CAD (Computer Aided Design) and CAM (Computer Aided Manufacturing) software. The spindle of a stone carving machine is the heart of the machine. It is the part that does the actual cutting, rotating the cutting tool at high speeds to cut the material.

While CNC Stone Routers are known for cutting wood and metal, they can also effectively cut stone, which we'll explore below. Our CNC stone carving machines are specifically designed to work with stone rather than wood, especially by adding a constant stream of water to cool the tool and then circulating it back to the machine.

Various types of stone can be cut using the CNC Stone Engraver. These include but are not limited to marble, granite, limestone, sandstone, and slate. Let's take a closer look.

Marble is a soft stone that can be easily carved and sculpted using a CNC Stone Router. It is an excellent choice for intricate designs.

Granite is a harder stone and requires more power to cut. However, even complex designs are possible with the right CNC Stone Router and cutting tools.

Limestone, like marble, is relatively soft and can be cut using a CNC Stone Router. It is commonly used for decorative features and wall cladding.

Sandstone is another stone that can be easily cut with a CNC stone carver, making it ideal for a variety of decorative uses.

Slate is known for its fine grain and hardness and is commonly used for flooring, roofing and paving slabs. CNC milling machines can cut and carve slate with precision, making it an invaluable tool for craftsmen and builders.

Welcome to contact SMT to get free inquiries.

When it comes to achieving flawlessly polished granite surfaces, an automatic granite polishing machine takes the lead. This innovative machine employs specialized tools and techniques to effortlessly eliminate imperfections and scratches, restoring the natural beauty of granite.



Equipped with cutting-edge sensors and advanced technology, the automatic granite polishing machine delivers unparalleled precision and efficiency in the art of granite surface polishing. Its remarkable capabilities have made it a sought-after solution for both commercial and residential applications. From stunning granite countertops to elegantly finished floors and walls, this machine transforms surfaces with ease.



The core of this machine lies in its powerful motor, which drives the grinding wheel or polishing pad across the granite surface. By utilizing varying grit sizes of polishing pads, the polishing process can be tailored to achieve the desired finished look. This versatile approach ensures consistent and remarkable results, whether it be a high-gloss, mirror-like finish or a honed, matte appearance.



In addition to its exceptional performance, the automatic granite polishing machine also offers user-friendly features for enhanced convenience. With its intuitive interface and automated functions, operators can effortlessly program and control the machine, allowing for efficient operation and reduced downtime.



Furthermore, this machine’s durability and reliability are backed by its robust construction and quality craftsmanship. Designed to withstand heavy-duty usage, it delivers consistent performance even in demanding environments, making it an invaluable asset for granite fabrication businesses and homeowners alike.



When it comes to achieving impeccable granite surface finishes, the automatic granite polishing machine stands as the ultimate solution. Its specialized tools, advanced technology, and user-friendly features make it the go-to choice for professionals and enthusiasts seeking unmatched precision, efficiency, and stunning results.



Experience the future of granite surface polishing with the automatic granite polishing machine, and unlock a world of possibilities for your residential and commercial spaces.

Posted by Rick Lee

Date: November 12,2021

In November, because one of our Russian customers could not book shipping space, they switched to export by railway. Before the container was directly exported from Xiamen Port, now it has to drive more than 800 kilometers to Hunan Hengyang Station and take the railway. A 40-foot container is just fine. Install two sets of Transportable Bridge Cutter (Integral type Bridge Cutting Machine).

Therefore, if there is a demand, it is worth it no matter how expensive it is. It mainly depends on what value it can bring to you

XIAMEN SMT IMP.&EXP CO.,LTD. provides sturdy, precise and long-lasting bridge cutting machine, suitable for the needs of large and small-scale production.

Our product range includes numerous milling machines for the processing of solid blocks, CNC working centers, water jet cutting machines, combined cutting machines with disk and waterjet, polishing machines for slabs, lathes and wire shaping machines.

Our CNC Bridge Saws are designed to be the finest precision marble, granite, quartz, and stone cutting machines available. They provide you with speed, accuracy, safety, automation, and ease of use that no other product on the market can give.

XIAMEN SMT IMP.&EXP CO.,LTD. has a worldwide technical-commercial network to guarantee qualified support before and after purchase, with the speed, professional skills, and courtesy that distinguishes it.

XIAMEN SMT IMP.&EXP CO.,LTD. has progressed over the years keeping pace with market requirements, confirming its presence at a worldwide level. It has expanded its line of products by promoting ongoing research to achieve technological innovation and improvement and it is able to offer its Customers increasingly efficient and high technology machines carrying up to 5-year warranty.

The company now has an optimistic view of the future, aware that the quality of its machines and patents, the ongoing research focused on technological innovation and development will guarantee even further growth. The great project of a chinese company capable of combining imagination and beauty when designing its machines and the endless expressive options that these machines can guarantee to customers is a reality and has a name.

The oil sump of the rack support at both ends of the bridge-type stone cutting machine body should maintain the seal and the height of the oil level. The V-shaped guide rail and the knife rack in the oil tank of the bed should also maintain the oil level. If the oil deteriorates or water enters, the oil should be changed in time. The manual pump of the lifting round guide lubrication system should be filled with 30# mechanical oil and be oiled at least once per shift. Always observe the oil level of the machine bed moving the speed reducer back and forth, the tool speed reducer and the oil window of the spindle, and change the oil at least once a year.

Lubricating oil or grease must be added to each lubrication point of the turning shaft of the turning table, the turning cylinder support, the piston rod support shaft, and the rotary gear transmission mechanism of the working table. At the end of the work, the workbench must be raised so that the turning mechanism can be moved once to avoid rusting, and it is helpful for the water on the workbench to dry and prevent the wooden boards on it from decay.

Button box and electrical appliances

The button box that controls the turning and rotation of the workbench will inevitably be splashed with water when cutting the sheet. Over time, it will cause the button contacts to rust. Frequent inspections should be performed to remove the rusty spots. This equipment uses 18 miniature relays in the PLC control system. The contact capacity is small and the action is frequent, which causes the relay to often have poor contact, so it must be inspected or replaced in time. As long as the replaced relays are disassembled and lightly polished the contacts, they can generally be restored to use. The plug of each solenoid valve will also have loose contact and poor contact failure, which must also be reproduced.

Nowadays, the commonly used processing methods include manual cutting, semi-automatic cutting machine cutting,infrared bridge cutting machine and CNC cutting machine cutting. Although manual cutting is flexible and convenient, the subsequent processing workload is large, the size error is large, the material waste is large, and the working conditions are harsh. , Low production efficiency. The quality of the parts processed by infrared cutting and bridge cutting is better, which reduces the labor intensity of workers.

Compared with manual cutting, infrared cutting can effectively improve the efficiency and cutting quality of plate cutting, and reduce the labor intensity of the operator. With the development of modern machinery industry, the requirements for work efficiency and product quality of sheet metal cutting processing have also increased at the same time. Therefore, the market potential ofinfrared cutting machine is still very large, and the market prospect is relatively optimistic.

Infrared bridge cutting machine uses the high-speed rotary cutting technology of diamond cutters to be flexibly applied to field stone mining. The whole machine uses a combination of electromechanical integration, high performance ratio, scientific and reasonable structure, and has the advantages of high efficiency, low consumption, safety, environmental protection, and energy saving. Fundamentally solve the problems of unsafe mining of traditional stones, damage to resources, and environmental pollution.

Today we will introduce aconventional type of stone cutter machine-----Infrared bridge cutting machine.

Infrared bridge cutting machine produced by QUANZHOU NEW HAINENG MACHINERY CO. LTD. It adopts computer control, touch operation interface and wireless remote control, and the man-machine dialogue is flexible.This stone cutter machine has two options: separate type and integral type(With conjoined steel frame).

Introduction to main features:

1. The machine head rotates around the beam with a 0-45° chamfer.

2. Worktable 0-45-360 degrees with any angle positioning and cutting rectangle, standard octagon and any angle polygon.

3. The 0-85 degree turning plate of the worktable is used for fast boarding and table cleaning.

4. Side beams are equipped with linear guides.

FMain configuration description:

1.Mitsubishi inverter

2.Inovance PLC, touch screen

3.German Simon button

4.German original 2500 high pulse encoder

5.Germany Omron Relay

6.Taiwan Youshun Solenoid Valve

7.Spindle box Japan NSK bearing 4

8.National standard channel steel for workbench, thick wood.

FOther specification:

1.Delivery Time: Within 25 days after receipt of advanced payment.

2.Container need: 40Ft High Container

3.Guarantee Period: One year for spare parts ,and take effect after the machine put into production.

4.Available Power Supply: AS REQUESTED

5.Shipping Freight: should be check according the Port name provided by customer.

The main control components of stone cutter machine(Infrared bridge cutting machine)are all international famous brand components, The beam adopts oil-immersed double V-shaped track, the transverse cutting adopts stepless speed regulation, and the longitudinal segmentation mechanism adopts high-precision magnetic mountain counting to ensure the machine working precision.

For more details, please contact:RickLee.

Phone number:+86 18106087591

E-mail: leeyitian@vip.163.com