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Buyer’s Guide What to Look for in a Precast Concrete Magnet？
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concrete embedded magnets

 

Precast concrete magnets (also known as embedded magnets or concrete embedded magnets) are widely used in construction, industrial equipment, exhibitions and other fields to fix, hang or dock metal parts. Choosing the right precast concrete magnet requires comprehensive consideration of multiple technical indicators to ensure its performance, durability and safety. The following are some important influencing factors:

 

1. Magnet pulling force (adsorption force) The pulling force of the magnet is the core indicator, which directly determines its load-bearing capacity.

Things to note when purchasing:

Clear requirements: Determine the required pulling force according to the actual application scenario (such as hanging tools, fixed steel structures, exhibition props, etc.). Common specifications range from tens of kilograms to hundreds of kilograms.

Test standard: Magnet pulling force is usually marked as "vertical pulling force" or "shear force", and the test conditions (such as how thick the steel plate is in contact with) need to be confirmed.

Safety margin: It is recommended to choose a model with a pulling force 20%-30% higher than the actual demand to cope with dynamic loads or magnetic attenuation after long-term use.

 

2. Shell material

The magnet shell needs to have the dual functions of protecting the magnet and facilitating installation. Common materials include:

Stainless steel (such as 304/316): Strong corrosion resistance, suitable for humid or outdoor environments (such as swimming pools, coastal buildings).

Galvanized steel: High cost performance, but not as rust-proof as stainless steel, suitable for dry indoor environments.

Engineering plastics: Lightweight and insulating, but with low load-bearing capacity, mostly used for electronic equipment or temporary fixation.

Recommendation: Stainless steel shells are preferred, especially in humid, acidic and alkaline environments.

 

3. Rust prevention and sealing treatment

Prefabricated magnets are embedded in concrete for a long time, so rust prevention is crucial:

Surface treatment: Check whether it has been nickel-plated, epoxy-coated or passivated to resist alkaline corrosion of concrete.

Sealing design: High-quality magnets will use rubber rings or glue-filling technology to prevent moisture from penetrating into the magnet.

Weather resistance: For outdoor use, products with IP65 or above protection level must be selected.

 

4. Ease of installation and removal

Prefabricated magnets need to be embedded before concrete pouring, and the installation method affects the ease of construction:

Threaded hole design: allows the position to be adjusted with bolts later, suitable for scenarios that require flexibility.

Welded brackets or anchors: suitable for heavy-duty fixation to ensure that the magnets do not shift in the concrete.

Embedded vs. surface installation:

Embedded: The magnets are completely embedded in the concrete, with a flat surface, suitable for floor or wall applications.

Surface installation: The magnets are exposed, which is easy to replace, but may affect the appearance and safety.

Purchase advice: Confirm the thickness of the concrete pouring and ensure that the magnets are embedded deep enough (usually ≥50mm).

If later adjustment is required, choose models with threaded or removable designs.

 

5. Temperature and environmental adaptability

Different magnet materials have different temperature sensitivities:

NdFeB: The strongest magnetic force, but high temperature (>80°C) may cause demagnetization.

Ferrite: High temperature resistant (up to 250°C), but weak magnetic force.

AlNiCo: Good high temperature stability, but high cost.

Purchase suggestions:

Avoid using NdFeB in high temperature environments (such as workshops and boiler rooms), and use ferrite or AlNiCo magnets instead.

 

Other key considerations

Anti-vibration design: If used in vibrating equipment, the magnets need to have cushioning rubber or a locking mechanism.

Certifications and standards: Check for compliance with industry standards such as ISO 9001, CE or ASTM.

Supplier reputation: Choose a professional manufacturer like LSC to ensure material authenticity and after-sales service.

How Do Steel Explosion-Proof Rolling Shutter Doors Ensure Maximum Safety?
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In industrial environments where hazardous materials are handled,ensuring safety is of utmost importance.Steel explosion-proof rolling shutter doors are designed to provide unparalleled protection against explosions,fires,and structural collapses.But how exactly do they work?Let’s take a closer look.

 

These doors are made of reinforced steel,capable of withstanding extreme pressures and high temperatures.Their multi-layered structure combines fire-resistant materials with impact-absorbing mechanisms to form a barrier that prevents the spread of explosions.Stainless steel explosion-proof door doors also feature a sealed design that prevents toxic smoke and debris from escaping hazardous areas,protecting personnel and equipment.

 

A key advantage of these doors is their automatic response system.Equipped with sensors,the doors can be activated immediately in an emergency,closing off the area within seconds.This rapid response helps to minimize damage and ensures compliance with strict safety regulations.Moreover,their durable steel construction is resistant to corrosion,making them ideal for industries such as oil and gas,chemical plants,and pharmaceuticals.

 

In summary,steel explosion-proof rolling shutter doors are specifically designed to withstand the extreme conditions that may arise from potential explosions.The robust steel structure provides a strong barrier to contain blasts and prevent the spread of dangerous gases or flames.The rolling shutter mechanism allows for quick and efficient operation,enabling the door to close rapidly in emergencies to seal off hazardous areas and protect people and property.

What is the difference between steel fire-resistant roller shutters and ordinary steel roller shutters?
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Steel fire-resistant roller shutters and standard steel roller shutters both fall under the category of roller shutters and share the same steel material. Despite their similar names, these two types of shutters serve distinct purposes. Below is an analysis of their key differences:

 

Different Usage Scenarios

Steel fire-resistant roller shutters are primarily installed in commercial spaces such as shopping malls, supermarkets, and underground parking garages. Underground environments are often damp, making inorganic fabric-based shutters unsuitable due to moisture absorption. These shutters are designed to prevent the spread of flames in large fire zones where traditional fire doors cannot be used. They are critical for protecting lives and property and are typically integrated into a building’s internal fire safety partitions.

Standard steel roller shutters, on the other hand, are far more common. They are widely used for storefronts and residential garages, primarily serving as security barriers against theft and external threats. They are generally installed on building exteriors.

 

Motor and Wiring Differences

Steel fire-resistant shutters use explosion-proof and fire-resistant motors with a minimum protection rating of IP55. In contrast,standard steel shutters rely on ordinary motors with lower protection ratings (e.g.,IP23 or IP44), which are inadequate for fire hazards.

The explosion-proof motor’s wiring system includes a sealed junction box with high-density gaskets, and internal motor windings are fully enclosed to prevent spark generation. Power supply connections feature extended, movable flame-retardant conduits with threaded interfaces, ensuring compatibility with fire-rated electrical conduits. This design achieves complete fire-resistant sealing.

 

Filler Material Variations

Fireproof explosion-proof shutter doors use hollow, bent steel slats without internal fillers.Fire-resistant steel shutters, however, incorporate asbestos—a flame-retardant and heat-insulating material—within their slats. Asbestos is chosen for its high tensile strength, flexibility, resistance to chemical and thermal erosion, and electrical insulation properties. Its presence directly determines the shutter’s fire resistance performance.

 

Control System Distinctions

Standard steel shutters may operate manually or via basic motorized controls, with independent physical or motorized switches. If the motor fails, manual operation remains an option.

Fire-resistant steel shutters, however, are integrated into a building’s central fire control system. During emergencies, these shutters automatically activate upon receiving signals from the fire control center, ensuring coordinated fire response.

The above points outline the critical differences between steel fire-resistant roller shutters and standard steel roller shutters. Understanding these distinctions helps clarify their respective roles in safety and functionality. Fire-resistant shutters prioritize life safety and regulatory compliance, while standard shutters focus on convenience and basic security.

Comprehensive analysis of precast concrete lifting anchors and their application guidelines
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Precast concrete is widely used in modern buildings due to its high efficiency, durability and economy. As a key component for the transportation and installation of precast components, lifting anchors directly affect construction safety and efficiency.

 

precast concrete lifting anchors

 

What are precast concrete lifting anchors?

Lifting anchors are pre-buried or post-installed load-bearing components used to lift and install precast concrete components (such as wall panels, beams, columns, composite slabs, etc.). It must have sufficient strength to withstand dynamic loads during lifting, transportation and installation.

 

Main types of lifting anchors

1. Pre-embedded anchors: embedded before concrete pouring

- Lifting Loops – suitable for vertical lifting (such as wall panels, stairs).

- Threaded Inserts – can be connected to the lifting anchor by bolts after the concrete hardens.

- Plate Anchors – used for heavy components (such as beams and columns).

2. Post-installed anchors: installed after the concrete hardens

- Bolt-on Anchors – fixed by high-strength bolts.

- Undercut Anchors – provide high pull-out resistance.

3. Special anchors

- Swivel Anchors – allow angle adjustment during lifting.

- Lifting Clutches – suitable for double T-slabs and hollow slabs.

 

Key design points

1. Load calculation

- To consider:

- Static load (self-weight of component)

- Dynamic load (hoisting impact, usually calculated as 2 times of static load)

- Safety factor (generally ≥3, in accordance with EN 1992-4 or ACI 318)

2. Anchor arrangement

- Should be located at the center of gravity of the component to avoid tilting.

- Multiple anchors need to be evenly stressed to prevent local overload.

3. Concrete strength - The anchor depth must meet the pull-out requirements.

- The concrete strength during hoisting must reach the design value (usually ≥20MPa).

4. Anti-corrosion treatment

- For outdoor or corrosive environments, hot-dip galvanized or stainless steel anchors should be used.

 

precast concrete lifting anchorsprecast concrete lifting anchors

 

Installation specifications and precautions

1. Construction according to specifications - strictly follow the burial depth and spacing requirements provided by the manufacturer.

2. Inspection before lifting - confirm that the anchor is free of cracks, deformation or rust.

3. Matching lifting equipment - the rated load of the sling and shackle must be greater than the weight of the component.

4. Smooth lifting - avoid sudden acceleration or sudden stop to reduce impact force.

5. Post-processing - exposed anchors need to be removed or protected from rust.

 

 

What are the 3 types of magnets?
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Magnets are an integral part of our daily lives, found in everything from refrigerator magnets to high-tech medical devices. But did you know that there are three main types of magnets? Understanding these three main types of magnets and their properties can help us make smarter choices in our daily lives and work. Whether it's the long-lasting stability of permanent magnets, the flexible controllability of electromagnets, or the instant response of temporary magnets, each type has its own unique advantages and application scenarios. With the development of materials science, magnets in the future will become more powerful, efficient, and environmentally friendly.

 

magnets

 

1. Permanent magnets (permanent magnets)

Permanent magnets are the most common type of magnets. They can maintain magnetism for a long time without the help of external power.

The main characteristics are: Once magnetized, they can maintain magnetism for a long time, do not require external energy to maintain the magnetic field,

Have fixed north and south poles

Common types:

- Neodymium magnets (rare earth magnets): the strongest permanent magnets currently, composed of neodymium, iron and boron

- Ferrite magnets (ceramic magnets): low cost, corrosion resistance, but weak magnetism

- Alnico magnets: high temperature resistance, but easy to demagnetize

Application areas:

- Speakers and headphones

- Motors and generators

- Magnetic therapy products

- Fridge magnets and toys

Advantages and disadvantages:

- Advantages: easy to use, no energy required, good stability

- Disadvantages: fixed magnetic strength, may demagnetize at high temperatures

 

2. Electromagnet

An electromagnet is a temporary magnet that generates a magnetic field through an electric current. When the current is interrupted, the magnetic field disappears.

Its working principle is as follows: an electromagnet consists of a coil of wire wrapped around an iron core. When current passes through the coil, a magnetic field is generated, and the iron core strengthens this magnetic field.

Features: The magnetic field strength can be adjusted by the current size, the direction of the magnetic pole can be changed by the current direction, and it only exhibits magnetism when power is applied

Application areas:

- Cranes (for handling scrap metal)

- Magnetic resonance imaging (MRI) equipment

- Relays and contactors

- Particle accelerators

Advantages and disadvantages:

- Advantages: The magnetic field strength is adjustable and can be turned on/off at any time

- Disadvantages: Requires continuous power supply and may generate heat

 

3. Temporary magnets

Temporary magnets are materials that exhibit magnetism under certain conditions. When the conditions disappear, the magnetism will also weaken or disappear.

Main characteristics: only exhibit magnetism when an external magnetic field exists, usually made of soft magnetic materials, easy to magnetize and demagnetize

Common materials:

- Soft iron

- Certain stainless steels

- Nickel and its alloys

Application areas:

- Core materials for electromagnets

- Transformer cores

- Temporary magnetic tools

- Magnetic shielding materials

Advantages and disadvantages:

- Advantages: easy to control, low energy loss

- Disadvantages: cannot maintain magnetism for a long time

 

How to choose the right magnet? When choosing a magnet type, the following factors need to be considered:

1. Required magnetic field strength: strong magnetic field applications may require neodymium magnets or electromagnets

2. Use environment: high temperature environments may require AlNiCo magnets

3. Cost considerations: ferrite magnets have the lowest cost

4. Whether adjustment is required: electromagnets should be selected for applications that require magnetic adjustment

 

Do fireproof rolling shutter doors need to be integrity and insulation?
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Fire incidents can cause significant damage to properties and pose a risk to lives. To enhance fire safety, the installation of fire protection and insulation shutter doors is crucial.

Fireproof rolling shutter doors require two key characteristics: integrity and insulation.

1. Integrity: Integrity refers to the ability of a fire door to maintain its structural stability during a fire. Fire Protection and Insulation Shutter Doors are designed with materials that can withstand high temperatures and prevent the spread of flames, gases, and smoke to adjacent areas. The integrity of these doors acts as a barrier, limiting the fire's impact and providing valuable time for evacuation.

2. Insulation: Insulation plays a crucial role in minimizing heat transfer during a fire. Fire Protection and Insulation Shutter Doors are constructed with insulating materials that can resist heat transmission. This insulation property helps to control the temperature on the non-fire side of the door, protecting people and property from the intense heat generated by the fire.

The integration of integrity and insulation in fireproof rolling shutter doors offers several important benefits:

1. Controlling Fire Spread: Fire Protection and Insulation Shutter Doors with high integrity and insulation significantly reduce the spread of fire, smoke, and heat. This containment limits damage to adjacent areas and allows occupants more time to evacuate safely.

2. Enhancing Evacuation Safety: Fireproof rolling shutter doors with integrity and insulation provide vital escape routes during a fire emergency. They promote safe and efficient evacuation by preventing the rapid spread of flames and reducing the risk of exposure to toxic gases and excessive heat.

3. Protecting Property: The combination of integrity and insulation in Fire Protection and Insulation Shutter Doors helps safeguard property and minimize fire damage. By preventing the fire from spreading rapidly, valuable assets and infrastructure within the building can be preserved to a greater extent.

Are roller shutters fire proof?
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Fire incidents pose a significant threat to human lives and property safety. In the quest for effective fire safety measures, fireproof roller shutters have emerged as a reliable security solution. This article aims to explore the features and significance of fireproof roller shutters in ensuring the safety and protection of buildings.

Features of Fireproof Rolling Shutter Doors:

Fireproof roller shutters are specifically designed to prevent the spread of fire in case of an emergency. Compared to regular roller shutters, fireproof roller shutters possess the following features:

1. Fire and Smoke Barrier: Fireproof roller shutters effectively block the spread of fire and toxic smoke, thereby isolating the fire incident and providing a crucial window of time for safe evacuation.

2. High-Temperature Resistance: Constructed with fire-resistant materials, fireproof roller shutters can withstand high temperatures for extended periods, ensuring the structural integrity of buildings.

3. Automatic Control System: Many fireproof roller shutters are equipped with an automatic control system. They can be triggered by fire alarms or manually operated to swiftly close the shutter, preventing the fire from spreading further.

Importance and Applications:

Fireproof roller shutters play a vital role in numerous types of buildings. They find widespread application in the following contexts:

1. Commercial Buildings: Buildings with high foot traffic such as shopping malls, hotels, and office complexes require fireproof roller shutters to facilitate safe evacuation of employees and customers during fire emergencies.

2. Industrial Facilities: Factories, warehouses, and similar facilities often store flammable materials. Fireproof roller shutters effectively restrict the spread of fire, safeguarding both property and employees.

3. Public Facilities: Safety in public facilities like hospitals, schools, and airports is of paramount importance for protecting lives. Fireproof roller shutters provide emergency evacuation routes, minimizing harm to individuals during fire incidents.

What are the types of industrial high-speed doors?
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  Industrial high-speed doors are also known as high-speed rolling shutter doors. They are favored for their high opening speed, excellent sealing performance and diverse application fields. Currently, the commonly used high-speed doors mainly include PVC high-speed doors, rigid high-speed doors, cold storage high-speed doors, stacking high-speed doors and anti-collision high-speed doors.

PVC High-Speed Doors

  The operating speed of PVC high-speed doors can reach 1.2 m/s, and they can be opened 500 - 800 times a day with a long service life. The door curtain is made of single-layer industrial fabric, mainly composed of polyvinyl chloride (PVC). It has the characteristics of high strength, wear resistance, corrosion resistance and good insulation. The door curtain can also be customized in different colors such as blue, white, red, gray and fully transparent. Due to the influence of the door curtain material, it is not used alone as an exterior door. It is suitable for places such as the food, pharmaceutical, precision metal, textile, warehousing and logistics industries to play a role in sealing and partitioning. Various intelligent sensing devices such as radar, remote control, geomagnetic, pull rope, Bluetooth opening, face recognition, card swiping access control and AGV linkage can be optionally installed to meet the needs of various different scenarios.

Rigid High-Speed Doors

  Rigid high-speed doors are also called turbo rigid shutter doors. The opening speed can reach 1.0 to 1.2 m/s, and the closing speed is 0.6 m/s. The structure of the turbo rigid shutter door mainly consists of the door body, driving device, sealing system, control system and safety protection system. The door panel is made of 0.7 mm thick double-layer high-strength aluminum alloy material. The surface has pressed stripes, and the middle is filled with high-density polyurethane foam. The total thickness of the door panel is 43 mm. The track adopts a galvanized plate double-helix guide rail. The door body has a non-contact rolling-up technology and is safely rolled into the spiral track. There is no friction, the door body runs fast, smoothly and quietly, and there is no wear, which greatly extends the service life of the door body. Multiple opening methods such as radar, geomagnetic, pull rope, remote control, Bluetooth opening and face recognition, card swiping access control can be selected.

Cold Storage High-Speed Doors

  Cold storage high-speed doors are usually installed in warehouses below zero degrees Celsius. For a normal doorway of 2 - 3 meters, it takes 2 seconds to complete the opening and 3 seconds to complete the closing. Cold storage high-speed doors use multi-layer double-sided high-strength polyester fiber with a thickness of more than 30 mm, which can perform good internal and external heat insulation and heat preservation. Heating wires are installed at the guide rails to effectively prevent water vapor from freezing and affecting the operation of the high-speed rolling shutter door. When the cold storage high-speed rolling shutter door is opened, it is linked with the air curtain machine, which can effectively remove water droplets on the surface of the door curtain and prevent the door curtain from freezing. It can be connected to multiple opening methods such as geomagnetic, radar and pull rope. It is also equipped with various safety devices, such as safety light curtains, airbags, anti-collision columns and door-shaped anti-collision columns, to ensure the safe operation of the door body.

Anti-Collision High-Speed Doors

  Anti-collision high-speed doors are also called zipper-type high-speed doors. Their opening and closing speeds can reach 1.2 m/s. The appearance of anti-collision high-speed doors is almost the same as that of PVC high-speed doors. The zipper high-speed rolling shutter door adopts a side zipper structure with a reset mechanism. If the door curtain of this structure falls off the track, for example, due to human impact or accidental collision resulting in the derailment of some connections of the door curtain, its self-repairing system will automatically guide the door curtain back onto the track in the next operation cycle. After the track restoration is completed, the door can still operate normally without manual repair. It has high durability and saves maintenance costs.

Stacking High-Speed Doors

  Stacking high-speed doors are also called wind-resistant stacking doors. The opening speed is generally 0.6 - 0.8 m/s. They adopt a folding lifting method, and the door curtain can be stacked together when opened, reducing the occupied space. Stacking high-speed doors use multiple built-in horizontal wind-resistant levers, and the wind pressure can be evenly distributed across the entire door curtain. This design enables them to resist high wind speeds, and their wind resistance is stronger than that of other high-speed doors. They are especially suitable for logistics passages and large factory openings.

  Industrial high-speed doors are a type of doors with diverse functions. According to different application scenarios and requirements, different types of industrial high-speed doors can be selected. The characteristics of these types of industrial high-speed doors are different, but they can all provide users with functions such as fast opening and closing, energy saving and high efficiency, wind protection, dust prevention, insect prevention and heat preservation, providing important guarantees for the industrial and commercial fields.

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