The dryer scraper is a crucial component used in paper equipment and is typically made of phosphor bronze.

Why we use only phosphor bronze material for this scraper, here we have the answers:

We have the advantages on this specially designed alloy material like:

Corrosion resistance: Phosphor bronze exhibits excellent corrosion resistance, allowing it to be used in humid and chemical environments for extended periods without damage.

Outstanding wear performance: Phosphor bronze has good wear resistance, enabling it to endure high-speed scraping for extended periods, reducing blade wear and lifespan reduction.

Good conductivity: Phosphor bronze is a good conductor of electricity, providing excellent grounding conductivity in paper machine equipment.

Superior elasticity and hardness: Phosphor bronze possesses suitable elasticity and hardness, maintaining a stable shape and ensuring proper contact with the dryer surface.

In summary, phosphor bronze dryer scrapers possess excellent features such as corrosion resistance, good wear performance, conductivity, elasticity, and hardness. They are widely used in paper machine equipment for cleaning dryer surfaces, adjusting paper dryness, protecting the dryer surface, and enhancing production efficiency.

If you have any questions about this phosphor bronze dryer scraper, you're warmly welcome to contact Top We team.

Successful Injection Molding Service is an extremely complex undertaking, and the higher the complexity, the more expensive the mold becomes. Mainly include the following factors:

1. Material cost

Injection molds are subject to tremendous pressure and high temperatures. Therefore, the mold needs to be made of strong and durable materials so that it does not easily deform. These molds are typically made from different grades of steel or aluminum, raw materials that are inherently expensive.

2. Mold structure

Some complex parts need to be manufactured using molds. These parts are generally processed using imported professional machines to achieve strict tolerances, but the cost of imported machines is also very high.

3. Mold complexity and aesthetics

Some mold designs, strict tolerances, engravings, inserts, curves and other processes are relatively complex, making the finished product more refined and beautiful, but the production process is time-consuming and will also significantly increase the cost of the mold.

4. Labor costs

There are labor costs. Designing, manufacturing and assembling injection molds is a complex process that requires time and skill to be done correctly. Injection mold manufacturers and designers are experienced professionals, and their prices are also very high, which virtually increases the cost.

Recently, we received some inquiries from customers about dry-type transformers and oil-immersed transformers.

As you may know, dry-type transformers are generally more expensive compared to oil-immersed transformers. But why? What’s the difference between them?

Let Catherine explain it to you today!

Installation Location

Dry-type transformers are preferred for indoor locations such as basements, floors, and rooftops, especially in areas with high human population density oil-immersed transformers are typically used in substations.

Application

Box-type transformers are generally used for indoor applications, while oil-immersed transformers are commonly used for outdoor temporary power supply.

Space Considerations

The choice between dry-type and oil-immersed transformers depends on the available space. oil-immersed transformers are suitable for larger spaces, while dry-type transformers are preferred in compact spaces.

Climate: oil-immersed transformers are more suitable for humid and hot environments. If dry-type transformers are used in such conditions, they must be equipped with forced air-cooling systems.

Appearance

Dry-type transformers have visible cores and coils, while oil-immersed transformers are enclosed and only the outer shell is visible.

Connection

Dry-type transformers mostly use silicone rubber bushings, while oil-immersed transformers often use porcelain bushings.

Capacity and Voltage

Dry-type transformers are mainly used for distribution purposes, with capacities up to 1600 KVA and voltages below 10 KV. oil-immersed transformers can handle all capacities and voltage levels, including high voltage such as 1000 KV.

Insulation and Cooling

Dry-type transformers use resin insulation and rely on natural or forced-air cooling, while oil-immersed transformers use insulating oil for insulation and heat dissipation through radiators or cooling fins.

Suitable Locations

Dry-type transformers are commonly used in fireproof and explosion-proof environments, often in large and high-rise buildings. On the other hand, oil-immersed transformers are typically installed outdoors with provisions for an "incident oil pit" in case of leaks or spills.

Load-Bearing Capacity

Dry-type transformers should operate within their rated capacity, while oil-immersed transformers have better overload capacity.

Cost

Dry-type transformers are generally more costly compared to oil-immersed transformers of the same capacity.

If you want to know more about transformer cores, especially hope to purchase some good transformer cores in China. Contact SHUNGE! We will be very glad to help!

Transformers use various types of cores, with the most common ones being E-type and C-type cores. What are the differences between these two types of cores? And in which applications are they commonly used? Today, SHUNGE will tell you all about it.

E-type and EI-type cores are widely used in the industry. One of their main advantages is that the primary and secondary windings can share the same core, resulting in a higher window utilization factor. The core also provides protection for the windings, making them less susceptible to mechanical damage. Additionally, E-type cores have a larger heat dissipation area and reduce magnetic field dispersion.

However, E-type cores also have some drawbacks. They tend to have larger magnetic resistance due to the presence of larger air gaps in the magnetic path, which reduces the overall performance of the magnetic circuit. Furthermore, E-type cores are prone to issues such as higher copper wire usage, greater leakage inductance, and susceptibility to external magnetic field interference.

C-type cores are manufactured by winding cold-rolled silicon steel strips, which are then subjected to heat treatment and impregnation processes to form closed cores. These closed cores are then split to create two C-type cores. The windings are then encapsulated within the cores, and a pair of C-type cores are assembled and secured together to form the transformer.

C-type cores can have very small air gaps, and they offer advantages such as smaller size, lighter weight, and higher material utilization.

So, how can we identify the type of transformer core used in a power supply?

1. Identification based on appearance:

E-type cores have a shell-like structure, with a core that wraps around the coils. They are commonly made of high-quality silicon steel sheets such as D41 and D42. C-type cores, on the other hand, are made of cold-rolled silicon steel strips and have a core-type structure.

2. Identification based on the number of winding terminals:

Power transformers often have two windings, a primary and a secondary, resulting in four terminal connections. Some power transformers may have an additional shielding layer between the primary and secondary windings for AC noise and interference suppression. In such cases, the shielding layer is grounded. Therefore, power transformers typically have at least four terminal connections.

3. Identification based on the stacking method of silicon steel sheets:

In E-type power transformers, the silicon steel sheets are interleaved, with no air gaps between the E-shaped and I-shaped sheets. The entire core fits together tightly. In contrast, audio input/output transformers have certain gaps between their E-shaped sheets, which serves as a distinguishing feature from power transformers. C-type transformers are generally used as power transformers.

Shunge Steel, founded in 2008 and headquartered in Lecong, Foshan, produces cores with features such as low iron loss, high magnetic permeability, and high saturation induction. Our cores find applications in various fields, including signal communication, power drive, traction, renewable resources, charging station power control, high-precision measurement and control, new energy vehicle battery management, power control, welding, and new energy vehicle motor control.

If you have any core requirements, please feel free to contact us.

Tube sheet refers to the plate used for supporting and protecting pipelines. Pipelines are usually connected to the tubesheet through mechanical fixation or welding after drilling. In addition to serving as a fixing function, the pipe plate can also withstand the fluid and pressure inside the pipeline, reducing vibration and damage during operation. Carbon steel tube sheet, as a common tube sheet material, has a wide range of applications.

Carbon steel tube sheets are mainly composed of iron and carbon, which contain a high proportion of carbon elements, usually between 0.2% and 2.1%. In addition, it may also contain small amounts of elements such as manganese, silicon, and phosphorus, which can improve the strength and corrosion resistance of carbon steel plates. Here are some main advantages and disadvantages of carbon steel pipe sheets:

Advantages:

1. High cost-effectiveness: Carbon steel, as a common and economical material, is more affordable compared to other high alloy materials, making carbon steel pipe sheets the preferred choice in many applications.

2. High strength: Carbon steel is a type of steel with high strength, and its tensile strength is usually between 400-550MPa. This enables carbon steel plates to have high strength and rigidity under heavy loads and high pressures, enabling carbon steel pipe plates to maintain stability and reliability in high temperature and high pressure environments.

3. Good wear resistance: Carbon steel plates can achieve higher hardness and good wear resistance after heat treatment. Therefore, in some situations where wear resistance is required, carbon steel plate is the preferred material.

4. Easy to process and weld: Due to its low carbon content, carbon steel plates have good plasticity and weldability, and can be processed through various methods such as cold processing and hot processing. This makes the manufacturing and installation process of carbon steel pipe sheets relatively simple and efficient, reducing production costs and time.

5. Good environmental performance: Compared to other materials, carbon steel plates have better environmental performance. It can be recycled and reused to reduce resource waste and also reduce environmental pollution.

Disadvantages:

1. Easy to corrode: Carbon steel plates are prone to rusting, which is one of their biggest drawbacks. Due to the high content of iron in carbon steel plates, rust will occur when they react with oxygen in the air. This not only affects the appearance, but also leads to corrosion and damage to the surface of the board. Compared to stainless steel and other high alloy materials, carbon steel is more prone to corrosion in corrosive environments such as humidity, acidity, and alkalinity, which may lead to damage and shortened lifespan of the tube plate. To address corrosion issues, surface coatings or the use of anti-corrosion coatings can be used to enhance the corrosion resistance of carbon steel pipe sheets.

2. Not suitable for high temperature and strong acid environments: Carbon steel has lower temperature and acid resistance than high alloy materials, so in some applications that require high temperature or acidic media, carbon steel pipe sheets may not be suitable. This drawback can be avoided by welding other alloy materials to alter the performance of the contact surface.

3. Heavy weight: Compared to some lightweight alloy materials, carbon steel pipe sheets are relatively heavy, which may increase installation and maintenance difficulties.

In summary, carbon steel pipe sheets have advantages such as high cost-effectiveness, high strength, and ease of processing. However, their corrosion resistance, temperature resistance, and weight need to be evaluated based on specific application environments, and suitable materials should be selected to meet the requirements.

Atomic emission spectrum analysis has its unique advantages, especially suitable for pre-furnace analysis, so that it has become an essential analytical means for metal smelting and casting industry, and its characteristics are as follows:

(1) Multi-element simultaneous detection capability. Simultaneous determination of multiple elements in a sample. After each sample is excited, the different elements emit characteristic spectra, so that multiple elements can be determined simultaneously. For complex products, the more analytical elements are required to heal, and the economic benefits are good.

(2) Fast analysis speed. If the photoelectric direct reading spectrometer is used to analyze the sample without chemical treatment, the sample taken in the furnace can be excited on the sample table as long as the surface oxide is polished off, eliminating the trouble of drilling the sample for chemical analysis. For aluminum and copper, zinc and other non-ferrous metal samples, you can use a small lathe to remove the surface oxide can be directly measured. From sample excitation to the computer to report the element analysis content only 20-30 seconds, the speed is very fast, which is conducive to shortening the smelting time and reducing the cost. Especially for those elements that are easy to burn, it is easier to control their final composition.

(3) High accuracy. The analysis accuracy is very high, can effectively control the chemical composition of the product, ensure that it can meet the national standard specifications, and even the alloy composition can be controlled to the lower limit of the specification to save the consumption of intermediate alloys or ferroalloys.

(4) Less sample consumption.

(5) The analytical data can be printed out from the computer or stored on a floppy disk as a permanent record.

In short, from a technical point of view, photoelectric spectral analysis, it can be said that there is no more effective instrument than it can be used for rapid analysis in front of the furnace, with so many characteristics and can replace it. Therefore, the world's smelting, casting and other metal processing enterprises are competing to use this kind of instrument to become a conventional means of analysis, from the guarantee of product quality, from the economic benefits and other aspects, it is a very favorable analysis tool.

     Demagnetization is the loss of magnetic field strength in magnets. Every magnet has a specific temperature, which is called the Curie temperature, at which it loses its magnetism. If magnets cool to room temperature, they may not regain previous super strong magnetic strength.

What causes strong neodymium magnets to demagnetize?

1. Influence of external magnetic field

     External magnetic fields, especially strong magnetic fields, can cause magnets to lose strength. The alignment of the magnetic domains can be disrupted when exposed to the north and south poles of another magnet.

2. Effects of heat exposure

     Heating permanent rare earth neodymium magnets to the Curie temperature causes its magnetic domains to randomize. Even if the magnet cools down, its original magnetic force may be reduced.

3. The role of working temperature

     Magnets' operating temperature is the highest temperature the magnets can withstand without significant loss of magnetic force. Neodymium magnets have a maximum operating temperature above which they may become demagnetized.

How to determine if neodymium magnets have been demagnetized?

     One must observe its magnetism and properties to determine whether strong power neodymium magnets have been demagnetized. Loss of strength or weakening of the magnetic field may be indicative signs. However, to understand the complete guide to demagnetization, one should understand the inherent properties of magnets such as permeability and temperature tolerance. Using tools or exposing a magnet to another magnet (such as an old magnet from the North) can provide further insight into its current state.

How to remagnetize a demagnetized neodymium magnet?

1.Make sure the demagnetized magnets are at room temperature.

2.Use stronger magnets or current to expose the demagnetized magnet to a strong magnetic field.

3.Make sure the magnets are aligned with the magnetization direction.

     PS：Make sure the magnets are only heated to its Curie point. Additionally, instruments are used to measure the strength that the magnet regains after remagnetization.

     Ndfeb magnets can be divided into bonded NdFeb and sintered NdFeb. The difference between the two magnets is mainly in the production process: bonded neodymium magnet is injection molding by adding NdFeb magnetic powder to the adhesive; sintered neodymium magnet is vacuumed and molded by high temperature heating.

     1. Custom sintered neodymium magnet

     In the process of sintering magnet manufacturing, neodymium magnet powder is mixed with appropriate additives and heated by high temperature sintering process. In the sintering process, the neodymium magnet powder particles will be combined to form a stable magnetic structure, thus forming a magnet with strong magnetism. Generally, through sintering, only blank can be produced, and then through mechanical processing (such as wire cutting, slicing, grinding, etc.) to become a magnet of various shapes. Sintered NdFeb is a hard and brittle material that is difficult to process, with large loss during processing. But the advantage is that sintered magnets usually have a high magnetic force and magnetic energy product, and have good temperature stability.

     Sintered Ndfeb is generally divided into axial magnetization and radial magnetization, and the magnetization direction can be customized according to the required work needs, while sintered Ndfeb has poor corrosion resistance and is easy to oxidize, so it is necessary to deposit on its surface, common nickel plating, galvanized, epoxy plating and so on.

     2. Custom bonded neodymium magnet

     The bonded neodymium magnet is used adhesive to bond the neodymium magnet powder with other metal elements, so it is magnetic in all directions and resistant to corrosion. In the manufacturing process, neodymium magnet powder and adhesive are mixed to form a magnet by pressure or injection molding. Because it is molded by injection molding, the density is generally only 80% of the theoretical, and the magnetism is weaker than the sintered neodymium magnet. But the manufacturing method of bonded neodymium magnets allows for more complex shapes and structures, and can be used in combination with other materials.

     The above is the introduction of the difference between the production processing technology of bonded NdFeb and sintered NdFeb. Both types of custom neodynium permanent magnets have their advantages and application scenarios. Sintered magnet is commonly used in applications that require high magnetic force and temperature stability, such as engines, sensors, and nuclear magnetic resonance equipment. Bonded magnet is suitable for applications that require custom shapes and structures, such as magnetic pusher pins, magnetic labels, etc.

     In short, the manufacturing process of sintered magnet and bonding magnet is different, and the choice of the appropriate process depends on the specific application needs.

Nowadays, most industries are using high-tech and modern types of valves to enhance production and operation.

Out of all the other types of industrial valves, globe valves are widely used in the oil, gas and fuel industries.

There are many uses of this type of valve as it works to stop as well as regulate the flow of liquids. If you want to know more about globe valves and their uses, follow this article.

What Are Globe Valves?

It is a type of linear motion valve which is used in different types of industries. It is designed in a way that you can use it for throttling as well. 

It has a spherical shape like a globe and comes with a disc. The disc moves in order to block as well as allow the flow of substances. When you close the valve, the disc entirely covers the pathway to stop the flow of fluids.

However, when you open the valve, the disc moves upwards in order to clear the pathway and allows substances to flow freely. It is mostly used for isolation and throttling purposes.

This type of industrial valves has good shutoff capability. You can use it to prevent leakages. Apart from that, it also offers good throttling capacity.

The stroke is shorter, which makes it easy to use and maintain. It is available in different types and designs. 

Applications and Uses of Globe Valves:

Globe valves have many applications. It is used for industrial as well as domestic purposes. The majority of the industries with plumbing needs use this type of valve. Here are some applications and uses of globe valves. 

Cooling Water Systems:

A globe valve helps maintain the heat and cooling of the system by regulating the flow. It helps in the adjustment of the temperature of the system in relation to the demand of heat or cool by taking the measurement of the changes in pressure. As a result, a valve regulates the amount of heat produced by the boiler. 

Fuel Oil Systems: 

A Globe Valve is a very important component of fuel oil systems. It helps to prevent and control the rate at which gasoline is burnt in an engine, thus enabling the engine to maintain a constant pressure of fuel at all times. It is usually found on the side of the engine near the firewall. It has a round-shaped body and has two cones on its side. 

Chemical Feed Systems:

A Globe valve is one of the important parts of chemical feed systems. It helps in the complete process of converting the feed mixture into a liquid, and it also helps in the separation of solids from the liquid mixture. A Globe valve has a piston, and it is rotatable. In this, the piston moves up and down due to the increase and decrease in pressure. 

Boiler, Main Stem Vents and Drains:

The globe valve is used in main steam and boiler rooms and drains as well. They can be used for controlling the amount of steam that enters a room from outside, regulate the water temperature in the boiler or condensate drain, or act as a thermostatic valve. It is commonly used in the hot water tank to prevent the loss of hot water from the tank through the pipes.

Turbine Lube Oil System:

A globe valve is used in a turbine lube oil system as it allows the flow of turbine oil to be limited to a single point. The oil is pumped by means of a turbine into a sump tank that is located above the turbine.

This technical specification is suitable for the bidding for the procurement of steel pipe projects.

Executive standards

The steel pipe shall meet the following standards:

Quality standard like Spiral Welded Submerged Arc Welded Steel Pipes for Urban Heating CJ/T3022-1993 or Technical Delivery Conditions of Oil and Gas Industry Transportation Steel Pipes GB/T9711.1-2017 should be implemented for spiral welded pipes.

Seamless Steel Pipe for Fluid Transportation GB/T8163-2008 should be carried out as quality standards for seamless steel pipes.

Technical requirements for steel pipes

Materials

The steel pipe should be made of spiral seam welded steel pipes with Q235B.  The seamless steel pipe should adopt 20# steel.

Technical specifications

The quality and size of spiral seam welded steel pipes should conform to IS09330-1 or GB9711.1～2017 standards.

Spiral seam welded steel pipes should ensure that the minimum yield strength is greater than 235N/mm2.

Weld joints of steel pipes must meet the technical requirements of DIN1626 or GB3323-87.

Specifications, weights and errors of steel pipes

The supply of steel pipes shall comply with the relevant regulations in the latest GB9711.1-2017 or GB8163-2008.

The normal supply length of the steel pipe should be 12m with a length deviation of 0/+25mm.  When the length of the steel pipe is less than 12m due to the valve, compensator or pipeline turning, it should be supplied according to the actual length on site.

The thickness deviation requirements of the raw material steel plate of the steel pipe: when DN is 800mm, the negative thickness deviation should be smaller than or equal to 0mm.  When DN is greater than 800 and smaller than or equal to 1100mm, the thickness negative deviation should be less than or equal to 0mm.  When DN is greater than 1100 and smaller than or equal to 1200mm, the thickness negative deviation should be less than or equal to 3%.

The end of the steel pipe should be grooved.  The groove angle should be 30° and the deviation 0°/5°.  The size of the blunt edge should be 1.6±0.8mm.

The end surface of the steel pipe shall be perpendicular to the axis of the steel pipe.  When the nominal outer diameter is less than 508mm, the limit deviation shall not be greater than 1.5mm.  When the nominal outer diameter is greater than or equal to 508, the limit deviation shall not be greater than 2.0mm.

The ovality of the steel pipe end within 100mm shall not exceed ±1%D.

Requirements for manufacturers

In order to ensure the quality of the project, the following requirements are put forward for the materials and manufacturers of steel pipes and fittings:

The steel quality standards of steel pipes are equal to or higher than those of famous steel pipe manufacturers in China.

The quality standard of the steel pipe is equal to or higher than the product standard produced by the bidder, and the selected manufacturer must be approved by the tenderer and indicate in the bidding document.

At the same time, photocopies of the delivery quality certificate of the steel pipe raw materials, the quality certificate of the steel pipe, the special equipment manufacturing license (pressure pipe) that the manufacturer should have, and the inspection report issued by the local quality inspection department must be attached to the bidding documents.