High-density polyethylene (HDPE) is a widely used and recyclable plastic. Nonetheless, the presence of polypropylene (PP) contamination poses a significant issue in recycled HDPE streams.

Plastic Mixture

Can PP and HDPE be recycled together?
PP and HDPE are distinct types of plastic with different chemical compositions and properties. When they are mixed together in the recycling stream, it can result in various issues:

Reduced quality: Mixing PP with HDPE can lead to lower-quality recycled HDPE material. The properties of the resulting plastic may not meet the required standards for certain applications.

Compatibility issues: PP and HDPE have different melting points and processing requirements. Combining them can make it difficult to maintain the consistency and quality of the recycled material during the melting and molding stages.

Material weakness: The combination of PP and HDPE can result in a recycled material that has reduced strength, durability, and performance. This can be problematic, especially in applications where HDPE's mechanical properties are critical.

Identification and Separation of polymers in the industry
One of the biggest challenges facing the plastics recycling industry today is separating all of the various polymers entering the recycling stream. Separating PP from HDPE during the recycling process can be challenging due to their similar appearance. This can result in contamination if they are not adequately separated at recycling facilities.

To mitigate contamination issues, recycling facilities often employ advanced sorting and separation technologies to ensure that PP and HDPE are properly separated. This involves using optical sorters, air classifiers, and other equipment to identify and separate different types of plastics.

Near Infrared (NIR) Sorting Technology

Among them, the NIR-based sorting machines are widely used in the recycling industry to identify and separate various types of plastics based on their unique spectral signatures in the near-infrared range. These machines can accurately differentiate between different polymer types, such as PET, HDPE, PP, PVC, and more, facilitating the efficient recycling of plastics and reducing contamination in the recycling stream.

AMD's plastic color sorting machines are known for the high accuracy and reliability. We contribute to efficient recycling operations by reducing contamination in the recycling stream and ensuring the production of clean, high-quality recycled materials.

What is high grade silica sand used for?

Silica sand is a new type of hard, wear-resistant and stable composite stone with silica as the main component, also called silica, mostly presented as transparent or translucent colourless, with a hardness level of 7 and a relative density of 2.65, with high refractory properties. Silica sand is formed after crushing and sand making, and is a very important industrial raw material.

Due to its chemical stability, good piezoelectricity, high melting point and hardness, High quality silica sand is widely used in glass, chemicals, casting, metallurgy and ceramics after processing.

How is silica sand processed? What kinds of equipment are needed?

METHOD 1: Dry Silica Sand Beneficiation Technology

Raw silica ore is coarsely crushed by jaw crusher → sorted by AMD large ore particle optical sorter → medium and fine crushing by cone crusher → screening by vibrating screen - sorted by AMD dry ore particle optical sorter → sand making by impact sand making machine → acid washing → drying → magnetic separation → sorted by AMD ore powder optical sorter → high purity silica sand is obtained.

METHOD 2: Wet Silica Sand Beneficiation Technology

The wet quartz powder manufacturing process is similar to the dry quartz powder manufacturing process, mainly with restrictions on water source and water quantity requirements, suitable for use in working conditions where environmental requirements are very strict and sufficient water sources are available. The processing flow is as follows.

Raw quartzite is coarsely crushed by jaw crusher → sorted by AMD large ore particle optical sorter → medium and fine crushing by cone crusher → screening-cleaning by vibrating screen → sorted by AMD wet ore particle sorter → sand making by impact sand making machine → acid washing → drying → magnetic separation → sorted by AMD ore powder sorter → get high purity quartz sand.

Optical Sorting Technology For Silica Sand Mining Process

Focusing on cutting-edge intelligent sorting technology, Zhongke Optic-electronic is the largest supplier of ore sorting equipment in China. With strong technical strength and professional service team, Zhongke provides one-stop sorting solutions for ore processing enterprises. The AMD® brand ore sorter under Zhongke widely covers the sorting scenes of large, medium and small particles of metallic and non-metallic minerals. Interested? Check out our ore sorting solutions.

A lithium-ion battery is primarily composed of a cathode, anode, electrolyte, and separator. During charging, lithium ions de-intercalate from the cathode material, migrate through the electrolyte, and intercalate into the anode material. During discharging, lithium ions move in the reverse direction, de-intercalating from the anode and returning to the cathode through the electrolyte. This repeated intercalation and de-intercalation of lithium ions between the cathode and anode enables the battery’s charge-discharge function, providing electrical energy to devices.

Capacity degradation in lithium-ion batteries is categorized into reversible capacity loss and irreversible capacity loss. Reversible capacity loss is relatively "mild" and can be partially recovered by adjusting charge-discharge protocols (e.g., optimizing charging current, voltage limits) and improving usage conditions (e.g., temperature/humidity control). In contrast, irreversible capacity loss arises from irreversible changes within the battery, leading to permanent capacity reduction. According to GB/T 31484-2015 standards for cycle life testing: "During standard cycle life testing, the discharge capacity shall not fall below 90% of the initial capacity after 500 cycles, or 80% after 1,000 cycles." If the battery exhibits rapid capacity decline within these standard cycle ranges, it is classified as capacity fade failure, typically involving irreversible degradation mechanisms.

I. Material-Related Factors

1. Cathode Material Structural Degradation

Cathode materials undergo complex physical and chemical changes during charge-discharge cycles. Taking spinel-structured LiMn₂O₄ as an example, its structure distorts due to the Jahn-Teller effect during cycling. This distortion accumulates with repeated cycles and may eventually cause cathode particle fracture. Fractured particles degrade electrical contact between particles, hindering electron transport and reducing capacity. Additionally, irreversible phase transitions and structural disordering occur in some cathode materials. For instance, under high voltage, certain cathode materials transition from stable crystal structures to phases unfavorable for lithium-ion intercalation/de-intercalation, impeding lithium-ion mobility and accelerating capacity loss.

2. Excessive SEI Growth on Anode Surfaces

For graphite anodes, interactions between the surface and electrolyte are critical. During the initial charging process, components in the electrolyte undergo reduction reactions on the graphite surface, forming a solid electrolyte interphase (SEI) layer. Normally, the SEI layer is ionically conductive but electronically insulating, protecting the anode from continuous electrolyte corrosion. However, excessive SEI growth poses significant issues. First, SEI formation consumes lithium ions, reducing the available Li⁺ for normal charge-discharge processes and causing capacity loss. Second, transition metal impurities (e.g., from cathode dissolution) deposited on the anode surface can catalyze further SEI growth, accelerating lithium depletion.
Silicon-based anodes, despite their high theoretical capacity, face severe volume expansion (>300%) during lithiation/delithiation. Repeated expansion/contraction causes structural damage, electrode pulverization, and loss of electrical contact, leading to irreversible capacity loss. Although technologies such as nanostructured silicon anodes and silicon-carbon composites mitigate volume effects, this remains a critical challenge for silicon anode commercialization.

3. Electrolyte Decomposition and Degradation

The electrolyte plays a vital role in ion transport. Common lithium salts like LiPF₆ exhibit poor chemical stability and decompose under high temperatures or voltages, reducing available Li⁺ and generating harmful byproducts (e.g., PF₅, which reacts with solvents). Trace moisture in the electrolyte reacts with LiPF₆ to produce hydrofluoric acid (HF), a corrosive agent that attacks cathode/anode materials and current collectors. Poor battery sealing allows external moisture/oxygen ingress, accelerating electrolyte oxidation. Degraded electrolytes exhibit increased viscosity, discoloration, and drastically reduced ionic conductivity, severely impairing battery performance.

4. Current Collector Corrosion

Current collectors (e.g., aluminum foil for cathodes, copper foil for anodes) collect and conduct current. Failures include corrosion and weakened adhesion. Corrosion mechanisms include:
• Chemical corrosion: HF from electrolyte side reactions reacts with collectors, forming poorly conductive compounds that increase interfacial resistance.
• Electrochemical corrosion: For copper foil anodes, dissolution occurs at low potentials. Dissolved copper ions migrate and deposit on cathodes ("copper plating"), reducing collector cross-sectional area and inducing side reactions.
• Adhesion failure: Volume changes during cycling can detach active materials from collectors if adhesion is insufficient, rendering them electrochemically inactive.

5. Trace Impurities in the Battery System

Transition metal impurities (Fe, Ni, Co) introduced via raw materials may participate in redox reactions, catalyze electrolyte decomposition, or compete with Li⁺ intercalation. These impurities also destabilize SEI layers, exacerbating anode side reactions.

II. Operational Environmental Factors

1. Temperature Effects

• High temperatures accelerate electrolyte decomposition and SEI restructuring. LiPF₆ degradation generates PF₅, which reacts with solvents, while SEI layers thicken into inorganic-dominated films with higher ionic resistance. For example, EVs operating in hot climates exhibit accelerated capacity fade.
• Low temperatures increase electrolyte viscosity and polarization, promoting lithium plating on anodes. Lithium dendrites may pierce separators, causing internal shorts.

2. Charge-Discharge Rates (C-Rates)

High C-rates during charging cause uneven lithium deposition, forming dendrites that consume Li⁺ and risk internal shorts. High-rate discharging exacerbates polarization, reducing usable energy and accelerating capacity loss. Power tools requiring frequent high-current discharge demonstrate shortened battery lifespans.

3. Overcharge/Over-Discharge

• Overcharge forces excessive delithiation of cathodes, causing structural collapse and violent electrolyte oxidation (gas generation, swelling, or thermal runaway).

• Over-discharge over-lithiates anodes, destabilizing their structure and inducing electrolyte reduction. Early smartphones without protection circuits showed rapid capacity loss under such abuse.

Consequences of Battery Failure

Severe capacity degradation manifests as insufficient runtime (e.g., short device operation after charging) or abnormal charging behavior (e.g., slow charging). In critical applications:

• Electric vehicles: Battery failure reduces driving range and may strand vehicles.

• Grid-scale energy storage: Failed batteries destabilize power supply reliability, threatening grid security.

At TOB NEW ENERGY, we are committed to being your strategic partner in advancing energy storage technologies. From high-performance battery cathode materials / battery anode materials and specialized binders to precision-engineered separators and tailored electrolytes, we provide a comprehensive suite of battery components designed to elevate your product’s reliability and efficiency. Our offerings extend to cutting-edge battery manufacturing equipment and battery tester, ensuring seamless integration across every stage of battery production. With a focus on quality, sustainability, and collaborative innovation, we deliver solutions that adapt to evolving industry demands. Whether you’re optimizing existing designs or pioneering next-generation batteries, our team is here to support your goals with technical expertise and responsive service. Let’s build the future of energy storage together. Contact us today to explore how our integrated solutions can accelerate your success.

Lithium plating refers to the detrimental phenomenon where lithium ions fail to intercalate into the graphite anode during charging processes, instead undergoing electrochemical reduction to form metallic lithium deposits. This results in the formation of characteristic silver-gray lithium metal layers or dendritic lithium crystals on the anode surface.

Conventionally, battery disassembly has been the primary method for confirming suspected lithium plating incidents, particularly when observable capacity anomalies or visible dendritic growth are present. However, advanced non-destructive diagnostic techniques now enable accurate detection through sophisticated electrochemical analysis.

Ⅰ. Advanced Non-Destructive Detection Methodologies:

1. Voltage Profile Deconvolution Analysis

During constant-current (CC) charging cycles, lithium-ion batteries typically exhibit a monotonically increasing voltage curve proportional to state-of-charge (SOC). The emergence of premature voltage plateau depression during the constant-voltage (CV) charging phase serves as a critical indicator of lithium plating. This phenomenon occurs due to the irreversible consumption of active lithium inventory through plating reactions, resulting in diminished reversible capacity and accelerated voltage decline.

2. Differential Capacity Analysis (dV/dQ)

This analytical technique involves calculating the first derivative of voltage with respect to capacity (dV/dQ) to identify characteristic phase transition peaks in graphite anodes. Lithium plating manifests through distinct alterations in these phase transition signatures, including:

• Peak position displacement (>20mV shift indicates severe intercalation obstruction)

• Peak intensity attenuation (reduced magnitude suggests compromised lithium insertion kinetics)

• Peak shape distortion (asymmetric broadening reflects heterogeneous reaction distribution)

3. Electrochemical Impedance Spectroscopy (EIS) Diagnostics

Lithium plating induces significant changes in interfacial charge transfer dynamics:

• Formation of electrically isolated "dead lithium" deposits increases ionic transport resistance

• SEI (Solid Electrolyte Interphase) layer reconstruction alters charge transfer impedance (Rct)

• High-frequency semicircle expansion in Nyquist plots (typically 100Hz-10kHz range) correlates with interfacial impedance growth

• Mid-frequency semicircle deformation reflects lithium deposition-induced charge transfer limitations

4. Ultrasonic Time-of-Flight (TOF) Characterization

This spatially resolved acoustic technique capitalizes on lithium-ion batteries' stratified architecture:

• Baseline TOF calibration establishes reference acoustic signatures

• Lithium deposition creates acoustic impedance discontinuities (ΔZ > 15% indicates significant plating)

• Echo waveform analysis detects:

- Signal amplitude attenuation (5-15dB variation)

- Phase shift anomalies (>5° deviation)

- Time-domain reflection coefficient changes (>8% threshold)

Current technical limitations:

• Primarily applicable to pouch cell configurations (aluminum casing in prismatic cells causes 90%+ ultrasonic attenuation)

• Detection threshold requires minimum 2.8% volume fraction of metallic lithium

• Requires sophisticated signal processing algorithms (e.g., wavelet transform denoising)

Ⅱ. Supplementary Detection Indicators:

• Coulombic efficiency depression (ΔCE > 0.5% per cycle)

• Open-circuit voltage (OCV) relaxation abnormalities

• Differential voltage analysis (dQ/dV) hysteresis expansion

• Thermal signature anomalies during relaxation phases

Ⅲ. Implementation Protocols:

• Establish baseline parameters through initial formation cycles

• Implement multi-modal detection protocol integration

• Apply machine learning algorithms for pattern recognition

• Perform cross-validation with reference electrode measurements

This comprehensive approach enables early-stage lithium plating detection with >92% accuracy while maintaining battery integrity, significantly enhancing safety protocols in battery management systems (BMS).

Ⅳ. Elevate Your Battery Safety Standards with TOB NEW ENERGY

At TOB NEW ENERGY, we are committed to being your strategic partner in advancing energy storage technologies. From high-performance cathode materials / anode materials and specialized battery binders to precision-engineered battery separators and tailored battery electrolytes, we provide a comprehensive suite of battery components designed to elevate your product’s reliability and efficiency. Our offerings extend to cutting-edge battery manufacturing equipment and battery tester, ensuring seamless integration across every stage of battery production. With a focus on quality, sustainability, and collaborative innovation, we deliver solutions that adapt to evolving industry demands. Whether you’re optimizing existing designs or pioneering next-generation batteries, our team is here to support your goals with technical expertise and responsive service.

Let’s build the future of energy storage together. Contact us today to explore how our integrated solutions can accelerate your success.

Color sorting technology has come a long way since its inception, transforming industries by enhancing efficiency, accuracy, and sustainability. From humble beginnings to cutting-edge innovations, the journey of sorting and grading machines reflects humanity’s quest for precision and quality control.  

 

In the early days, color sorting relied on manual labor and basic optical systems. However, the advent of high-resolution CCD cameras and advanced software revolutionized the field. Modern machines, like those used in food processing, scan materials at high speeds, identifying imperfections or discoloration with remarkable accuracy. For instance, in rice and coffee production, these systems eject defective grains using air jets, ensuring only premium products reach consumers. This technology soon expanded to other sectors, including recycling, where plastic colour sorting machines became indispensable. By distinguishing between polymer types and colors, these systems enable efficient recycling of materials like PET, ABS, and PVC, reducing waste and supporting circular economies.  

 

The rise of AI and machine learning has further elevated color sorting capabilities. Today’s color sorter machine price reflects not just hardware but also intelligent algorithms that adapt to varying material conditions. For example, 3D-nanoprinting and dynamic color modulation—inspired by natural phenomena like butterfly wings—allow for real-time adjustments, enhancing sorting precision. Meanwhile, innovations like hyperspectral imaging and IoT integration enable remote monitoring and predictive maintenance, minimizing downtime.  

 

At HTsorter, we embrace these advancements to deliver state-of-the-art solutions. Our sorting and grading machines combine robust hardware with AI-driven software, catering to diverse needs—from agricultural products to industrial plastics. Whether you require a compact system for small-scale operations or a high-throughput setup for large facilities, HTsorter balances performance and affordability.  

 

Looking ahead, the future of color sorting lies in sustainability and customization. Emerging trends include energy-efficient designs and machines capable of handling novel materials, such as biodegradable plastics. As industries prioritize eco-friendly practices, HTsorter remains committed to innovating solutions that align with global environmental goals.  

 

In conclusion, color sorting technology continues to evolve, driven by the demands for quality, efficiency, and sustainability. With HTsorter, you gain access to cutting-edge tools that redefine precision—proving that the right technology not only keeps pace with progress but leads it. Explore our range and discover how we can elevate your sorting processes today.  

A color sorter machine is a high-tech device that automates the separation of materials based on color, shape, or composition using advanced optical and AI-driven systems. These machines are vital in industries like food processing, recycling, and mining, where precision and efficiency are critical. At HTsorter, our innovations include the Best plastic pellet color sorter machine, High-precision plastic optical sorting equipment, and Plastic color sorting machine for recycling, designed to meet diverse industrial needs.  

 

How Does a Color Sorter Machine Work?  

The process involves three core stages:  

1. Material Feeding: Raw materials (e.g., plastic pellets, grains, or recycled plastics) are fed into the machine via a vibrating chute or conveyor belt.  

2. Optical Scanning: High-resolution CCD cameras or RGB sensors scan each item under controlled LED lighting. For example, Toshiba cameras with 360° scanning capabilities detect even subtle color differences or defects.  

3. Defect Removal: AI algorithms analyze the data and trigger high-speed air jets to eject impurities. This ensures only high-quality materials proceed, achieving over 99% accuracy in applications like separating PET from PVC.  

 

 

 

Key Applications of HTsorter’s Machines  

1. Plastic Recycling:  

 - The Plastic color sorting machine for recycling uses near-infrared (NIR) spectroscopy to identify and separate mixed plastics like PET and PVC based on their chemical fingerprints. This is crucial for producing food-grade recycled materials.  

 - The Best plastic pellet color sorter machine ensures uniformity in manufacturing by sorting pellets by color or polymer type, ideal for automotive and electronics industries.  

 

2. Food and Agriculture:  

 - HTsorter’s systems process coffee beans, grains, and nuts, removing discolored or contaminated items. For instance, coffee bean cleaning lines integrate vibration separators and color sorters to meet export standards.  

 

3. Mining and Pharmaceuticals:  

 - High-precision optical sorting separates ores, gemstones, or minerals by color and composition.  

 - In pharmaceuticals, color sorters ensure pill consistency by rejecting defective tablets.  

HTsorter’s Technological Edge  

 - Smart Connectivity: Cloud-based monitoring and adaptive AI optimize performance, reducing downtime.  

 - Energy Efficiency: Low-power LED lighting and modular designs cut operational costs.  

 - Customization: Machines adapt to niche needs, such as sorting black plastics or handling high-throughput recycling.  

 

Why Industries Choose HTsorter

 

 

- Proven Performance: Our High-precision plastic optical sorting equipment processes up to 1.6T/H with minimal maintenance, ideal for large-scale recycling plants.  

- Global Support: 24/7 technical assistance ensures seamless integration and upgrades.  

 

Color sorting machines are indispensable for modern industries aiming to enhance quality and sustainability. With HTsorter’s cutting-edge solutions, businesses achieve unmatched precision, efficiency, and eco-friendly outcomes.  

Tuck point saw blades must be used in strict accordance with the specifications in order to make the saw blades play their best performance:

1. Tuck point saw blades of different specifications and uses have different design cutter head angles and base forms, and try to use them according to their corresponding occasions;

2. The size and shape and position accuracy of the main shaft and the splint of the equipment have a great influence on the use effect, and should be checked and adjusted before installing the tuck point saw blades. In particular, the factors that affect the clamping force and cause displacement and slippage on the contact surface of the splint and the saw blade must be excluded;

3. Pay attention to the working condition of the tuck point saw blades at any time. If there is any abnormality, such as vibration, noise, and material feeding on the processing surface, it must be stopped and adjusted in time, and repaired in time to maintain peak profits;

4. The tuck point saw blades must not change its original angle to avoid local sudden heating and cooling of the blade head, it is best to ask professional grinding;

5. The tuck point saw blades that is not used temporarily should be hung vertically to avoid laying flat for a long time, and should not be piled on it, and the cutter head should be protected and not allowed to collide.

The material of the substrate of the concrete cutting saw blade must have a certain strength, and at the same time not be too soft. In the cutting work, the diamond saw blade will be strongly vibrated in use, because the cutter head is thicker than the base body, and there is a certain gap between the base body and the material to be cut during use. Fatigue fracture, the matrix must have a certain plastic toughness and higher fatigue limit and elastic limit, in order to play a role in mitigating impact and absorbing vibration, thereby improving the working efficiency of concrete cutting saw blades.



Due to the characteristics of the concrete cutting saw blade, the selection of the base of the concrete cutting saw blade is more stringent. The selection skills of the diamond saw blade base are nothing more than these two: First, select the grinding wheel with the larger particle size. , softer teeth can be selected. After cooling with cold water, grind again, dry grinding for 1-2 hours; second, the fine grinding degree of diamond should be calculated well and kept well under the progress of shape. Using these two skills, it is much easier to choose a diamond saw blade substrate with plastic toughness, fatigue limit, and elastic limit.



The matrix of the concrete cutting saw blade should have a certain plastic toughness and high fatigue limit and elastic limit. From the technical standard requirements, for the elastic limit, take the diamond saw blade with 65Mn as the matrix material as an example, its heat treatment There are two ways: quenching and tempering at medium temperature, but quenching is easy to deform and crack for the matrix of the diamond saw blade. Therefore, in the heat treatment process of the diamond saw blade substrate, the understanding and mastery of these two methods should be strengthened to reduce the impact on the mechanical properties of the diamond saw blade substrate.

The matrix of the concrete cutting saw blade plays the main role of bonding the cutter head, and the mechanical properties of the matrix also have a great influence on its quality and performance. Therefore, whether it is the choice of the substrate of the concrete cutting saw blade or the heat treatment process, the role of the substrate cannot be ignored.

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1. Please check carefully before installing the diamond grinding cup wheel to confirm whether the cutting wheel is deformed, cracked, chipped, etc.

2. When the flange is too small or the precision is poor, it is easy to damage the diamond grinding cup wheel, and it should be used after improvement.

3. When the diamond grinding cup wheel is marked with the rotation direction, it should be consistent with the mechanical rotation direction. On the contrary, the cutting is not sharp, and it is difficult to exert the performance of the diamond grinding cup wheel.

4. If a diamond grinding cup wheel that does not match the workpiece to be cut is used, abnormal wear, poor sharpness, and abnormal heat are likely to occur.

5. If any abnormality is found during the processing, it should be stopped immediately.

6. During the rotation of the diamond grinding cup wheel, it is strictly forbidden to use manual operation for processing, and it is not allowed to touch the grinding wheel with hands and body.

Paying more attention to the above points in processing can effectively improve the processing efficiency and quality of diamond grinding cup wheels, do you remember?

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When the traditional demolition construction is powerless, the advanced reinforced concrete cutting method is safe, efficient and environmentally friendly. Concrete cutting refers to the use of hydraulic wall saws to cut and separate buildings, cement, ground and walls, so as to achieve the cutting effect. Concrete cutting includes: manual cutting, diamond saw blade cutting, and diamond wire saw cutting.

First, the characteristics of concrete mechanical cutting:

1. The capacity is reasonable, the construction efficiency is low, and the pollution is small.
2. The demolition and construction efficiency is high and will not affect the surrounding
3. The cutting effect is remarkable and will not cause any impact on the building structure.

Second, the preparation before the concrete cutting
1. The conventional rated voltage of concrete cutting power tools is 220V. Before operation, you must check whether the power supply is 220V. If wrongly connected to a 380VA power supply, it will be very
Oops.
2. Before starting work, be sure to carefully check the performance of the cutting equipment to ensure the integrity of the mechanical parts.
3. Electric knife switch, saw blade tightness, saw blade cover, safety baffle, etc. need to be carefully checked by construction personnel, the console needs to be stable, and there must be enough lighting at night, remember
Concrete cutting construction should not be carried out in a dark environment.
4. Before the construction starts, the construction personnel first turn on the main switch, test the flywheel in the air for a few laps, and then start the work after confirming the safety.

Three, construction requirements:
1. Professional personnel must operate the cutting equipment.
2. The power supply must be placed in a safe location to prevent electric shock.
3. After starting the concrete cutting machine, the operator should first run it with no load to ensure that the saw blade is running in the correct direction.
4. The cutting thickness cannot exceed the specified limit. If abnormal noise occurs when the concrete cutting machine is working, the operator should stop the machine immediately to check, and then continue the operation after the fault is eliminated.

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