Marine mooring is a ship state, including the ties of docks, floating cylinders, or other mooring boats, mooring line required, relying on cable to fix the boat. The mooring bollard refers to the bollard fixed on the deck or the pier to tie the cable. It is generally made through metal casting or welding. Because it is very stressed when used, the base is very firm. In order to prevent the cable from slipping, the bollard is generally covered with a bollard cap which is slightly larger than the pile. The bollards are usually mounted on the front of the bow, the stern of the ship.
The mooring bollard has a specific shape. After thriving into the water, it can quickly engage the bottom to generate the grasping force. The vessel or other floating system is left to the special appliance of the designated water via anchor chain or anchor cable. A first anchor is installed on the outside of the ship's left and right bulldone, another anchor of the same specification is placed at the deck for spare use.
There are various types of marine bollards, including curved dock bollard, cruciform bollard, double cruciform bollard, double bitt mooring bollard, kidney-shaped bollard, staghorn bollard also known as twin horn dock bollard, T head bollard.
Arrangement Requirements Of Mooring Bollard
The piles which provide cable assistance for dragging, are arranged in the front and stern and the direction should be consistent with the cable dragging direction. The chock and the fairlead should be maintained at a certain distance, which should not be less than 6 times the diameter of the mooring bollard for a large vessel and not less than 10 times the diameter for a small ship, generally within the range of 1.5 ~ 2.5m, to provide enough deck for mooring assistance rope, no obstacle allowed within 1m around the bollard, and the distance between the outer edge of the bollard and the gunnel should not be less than 1.5 times the diameter of the mooring bollard.
Maintenance Requirements For Mooring Bollard
The carrying capacity of the mooring bollard is very huge and its working environment is above the sea with strong corrosion, which can greatly affect the service life of the marine bollard. In order to extend the service life and reduce the various damages, a variety of maintenance work should be done for daily use.
Cleaning work
As it is generally applied in the ship above the sea, some sea shellies and microorganisms are parasitic, so it needs to clean the mooring bollard and pay attention to regular cleaning of these microorganisms.
Reinforcement work
In daily use, the mooring bollard will be pulled by the cable, resulting in under the pulling force in a long time and the loose possibility is very large. It is necessary to pay attention to the reinforcement requirements and the regular inspection for the tightness, guaranteeing stability.
What Should Be Paid Attention To For The Daily Use Of Mooring Bollard Due to the important function, the following problems should be paid attention to, ensuring the stable and reliable performance of the mooring bollard.1.Operation correctly
The mooring bollard is easily damaged if there’s any problem exists during the operation, and the chance of failure will increase, so it is required to pay attention to the operation correctly, avoiding any error.
2. Do a good job for inspection
Even with superior quality, it is also possibly damaged during the use under the influence of external factors, which requires that during the application, pay attention to the inspection, avoiding the problems which will affect the normal use.
3.Solve the problem timely
In the daily use, it is necessary to inspect the mooring bollard regularly and solve the discovered problems timely.
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In the industries of paper, printing, textile, packaging, metal and wire & cable, in order to maintain high production efficiency, a basic tension controller is essential. It has wide applications, especially in the most related coiling and unwinding industries which need a perfect web tension controller to improve production efficiency and product quality.
What Is The Tension Controller?
Tension control refers to the ability to control the tension when the raw materials are transported on the device. In the coiling industry, the tension always needed to be controlled for production requirements, and the tension controller is a type of device for tension control. It has the advantages of small error, fast responding speed, high accuracy and simple adjustment. There’re three types of tension controllers including automatic tension controllers, semi-automatic tension controllers and manual tension controllers.
The basic composition of the tension control system
A typical tension control system is mainly composed of a tension controller, a tension reader, a tension detector, a magnetic powder brake, and a clutch. According to the loop, it can be divided into open loop, closed-loop, or free ring tension control system and it can be divided into types of ultrasonic, floating roll, track arm, according to the monitoring method of different coils.
Working principle of the tension controller
The tension controller can directly set the value of the tension control, and then input the signal of the tension sensor as a feedback value. Input the error to the PID or other manipulations for dealing with, and output to the actuator to control.
The tension controller system is controlled between the units of the magnetic powder clutch and must maintain a consistent ratio at the speed, a constant tension among the materials, or controlling tension according to the specified regularity, to ensure high-efficiency productivity and superior product quality.
Why The Tension Controller Is Important In The Coiling and Unwinding Industries
In the production process of paper, textile, plastic film, wire, printing products, tape, metal strip, etc, the roll of the material or wire is crucial to the quality of the product, and constant tension control is required for this purpose, which can make the products withstand the best tension in the process of winding and remain unchanged from the beginning.
The tension controller can be widely used in various applications where tension is precisely measured, with flexible and extensive applicability. The controller compares the deviation of the tension setting value and tension measurement. The output is adjusted through the proportional integration algorithm calculation, so that the web tends to be the setting value, thereby achieving the purpose of constant tension control. Therefore, it is very important to set the appropriate value of proportional integral and stationary zone parameters for the stability of the tension system.
The stability of constant tension control is directly related to the quality of the products. If the tension is too large, the stretch deformation of the processing material will be caused. If the tension is too small, it will deform the stress between the layers of the material and the layers, resulting in the uniform unwinding, affecting the quality of processing.
The Debugging Method Of The Tension Controller
The rewinding & unwinding, or transfer of the tension controller is based on the balance of tension variation in different industries, for high-efficiency production, the debugging method of the tension controller is critical.
The debugging method of the tension controller can be done in the following steps.
1. Programming the related parameters of tension measurement.
2. Make sure the tension controller is installed and the wiring is turned on the power.
3. By manual adjustment, check the system to confirm that the tension is normal and the actuator is operating normally.
4. Ensure the installation of the tension sensor and the wiring is correct. Check whether the signal of the tension sensor is normal.
5. Adjust the PID parameters according to the operation situation for guaranteeing the balance operation of the tension control system.
6. Calibrate the 0 points and the full scale of the tension signal, and ensure the normal display of the tension.
When the tension controller is automatic and the tension is greater than the setting value, the output current value is reduced. When the tension is smaller than the setting value, the output current value increases and the current value is increased with the increased tension in the system, which is greater than the setting value, the output current decreases, and the value of the tension will be reduced, thereby recirculating, achieving automatic control.
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The tungsten carbide nozzle is processed with super hard carbide materials by high-precision machinery and has high anti-curvature and high hardness, widely used in the field of surface treatment, sandblasting, painting, electronics, chemical processes, etc.
Advantages Of Tungsten Carbide Nozzle
Among the many nozzles, the carbide nozzle is the most rugged and the most cost-effective. Its anti-curvature can reach 2300N/mm and hardness can reach HRA90, be suitable for many industries and fields which have high requirements for hardness performance.
The cemented carbide nozzle is sintered by the heat pressure of the heat holes and huckles. It is conducive to the implementation of small work, such as cleaning parts, welding, cleaning handrail, stairs, gauge, or stone carving. It forms a sufficient airflow mode, which increases the abrasive rate by 100% for a given pressure and it is the best choice for high airflow to improve productivity.
The tungsten carbide nozzle has the advantages of corrosion resistance, long service life, excellent performance, wear-resistance, low density, etc, suitable in many applications. For example, the carbide nozzle is widely used in sandblasting to ensure that the products are used for a long time for the best air and abrasives.
The Common Types Of Tungsten Carbide Nozzle
The shape of the hole in the cemented carbide nozzle determines its airflow mode. According to the application industries, there are three types of carbide nozzles that are commonly used, which include tungsten carbide water coal slurry nozzles, carbide atomization nozzles, and carbide oil nozzles.
Tungsten carbide water coal slurry nozzles
The carbide nozzle has a wide range of applications in the hydrocryrid burner, which makes the water coal paste fuel burn much more fully and efficiently by good fuel atomization. Depending on the nature of the fuel, the carbide nozzle can also be divided into pneumatic, mechanical, rotary cup and ultrasonic wave. The rationality of its structure determines the atomization effect of the water coal slurry. The wear resistance and hot-impact resistance of the material determine the service life of the nozzle and directly affect the economics and safety of water coal slurry applications.
The wear of carbide water coal slurry nozzles mainly includes crystal grains, brittle fracture and grinding damage. The higher the CO content in the cemented carbide, the greater the erosion wear is, so it should be selected, which has less CO content. The water coal slurry nozzle made by tungsten carbide, compared to other metal materials, has better wear resistance and longer service life. However, the tungsten carbide itself has a large brittleness and high hardness and the toughness and the thermal impact properties are lower than other metal materials. It is not easy to process. The carbide tungsten can greatly improve the wear resistance of a nozzle.
Tungsten carbide atomization nozzle
The aerosolic form of the carbide atomization nozzle can be divided into types of pressure, rotary, electrostatic, ultrasonic and bubble. Because of its good atomization performance and wide coverage, the carbide nozzle is suitable for spraying, dust removal, and humidification, etc in industrial manufacturing and agricultural production spray.
Compared to other types of nozzles, the tungsten carbide nozzle can achieve a spray effect without an air compressor and the shape of the atomization is generally circular or fanned. In addition, the carbide atomization nozzle is also a very important role in the air conditioner. It is configured on the line of air-conditioning, which effectively reduces the heat generation during the air condition work by atomized water mist.
Tungsten carbide oil nozzle
With the development of the petroleum industry and the increasing energy demand, the carbide oil nozzles can be used with carbide tips to achieve improved drilling efficiency, and extend the service life of the drill bits.
Wide Applications Of Tungsten Carbide Nozzle
The applications of carbide nozzle are very wide, commonly used in automotive, electroplating, surface treatment, high-pressure cleaning, dust removal, cooling, desulfurization, humidification, stirring, etc.
Tungsten carbide nozzles are suitable for sandblasting, painting, electronics, chemical processes, etc. At the same time, it is also the active element for the coal chemical industry slurry output.
Cemented carbide nozzles are also used in different applications, such as wire drawing, line guides and many more other aspects.
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Tungsten carbide products used as wear-resistant parts include nozzle, guide rail, plunger, tire anti-slip nail, shovel snowboard, sweeping shovel, rotary seal ring, grinding mandrel, various pump parts, valve parts, seals, etc.
Carbide wear parts can be widely used as the carbide roller, precision molding & optical molds, stamping molds, drawings, seal ring, piston, bearing journal, and surface hardening welding, spray materials, etc.
How To Improve The Wear Resistance Of Carbide Wear Parts
The wear performance of the tungsten carbide is affected by the use of the environment and alloy performance. The wear resistance is mainly determined by the microstructure and chemical composition. The main structural parameters of the cemented carbide are that grain size and bonding phase content. The wear resistance is also affected by the added elements such as barium.
In industrial production, much important mechanical equipment and their mechanical parts are in harsh conditions, such as high speed, high temperature, high pressure, over-serving, etc., therefore, the damages of mechanical components occur frequently due to wear, corrosion, oxidation, which mostly are caused from the surface. The surface protective measures are used to delay and control the damage, which has become an effective method for solving the wear of mechanical parts. Therefore, various surface abrasion techniques for mechanical parts are adopted, such as plating, thermos, carburizing, nitriding, permeable metals, thermal spraying, surfacing, coating, pasting the hardening layer, high energy beam, etc. The rare earth has been successfully applied in the carbide wear part. When the strength and the impact toughness increase by more than 10%, the wear resistance of the carbide wear parts also has been improved.
Manufacturer Of High Precision Carbide Wear Parts - XYMJ
XYMJ has been committed to providing high-performance carbide products for mechanical industrial production. XYMJ relies on high production technology, professional production equipment, more than 20 years of experience, providing customer high-precision custom carbide wear parts on the basis of the drawings selecting superior materials to maximize the use requirements of customers for carbide wear parts.
XYMJ offers custom parts based on customer’s drawings, producing precision cemented carbide wear parts, using integral carbide materials, half-machined blank, internal threads, direct molding during the blank semi-processing. Surface fine milling can effectively control the dimensional precision machining into finished products.
The high hardness and excellent wear resistance are the basic requirements. According to the special production process of carbide parts, XYMJ adopts the professional vacuum low-pressure sintering process. When the blank is sintered into shape, the internal thread is semi-precision molding, which is convenient for subsequent finishing threaded dimensional accuracy. This is very powerful for tungsten carbide blank sintering and precisely controls the dimensional accuracy of the carbide wear parts.
The requirements for the production and processing of high-precision wear parts are strict and high, which need strong technical support and rich practical experiences with advanced equipment. XYMJ focuses on every detail of production and process, providing customized carbide wear parts, manufacturing according to high-precision applications of customers.
The superior performance of wear-resistant and corrosion make the carbide wear parts are popular in a wide range of industries. XYMJ, specializes in high precision processing and production for carbide wear parts, customized service available.
Wear-resistant components made by tungsten carbide as raw materials can be referred to as carbide wear parts, which have high hardness, strong wear resistance, wide industrial applications. Excellent wear resistance and high hardness make tungsten carbide wear parts suitable for manufacturing mechanical parts and drawing die featuring high-temperature resistance, friction resistance, corrosion-resistant.
What Is The Relationship Between The Hardness And Wear Resistance For Tungsten Carbide
Wear resistance refers to the ability to resist friction, and the tungsten carbide, which is a very widely used material, has high wear resistance. What is the relationship between the hardness and wear resistance for tungsten carbide?
In general, the higher the hardness is, the better the wear resistance. The smaller the particles of the tungsten steel has, the higher the hardness, the better wear resistance. The wear resistance of the cemented carbide is related to the contained proportion of titanium carbide, cobalt carbide. It will be higher hardness and better wear resistance, with more titanium carbide and less cobalt.
The tungsten carbide can reach 86 ~ 93hra at normal temperature, which is equivalent to 69 to 81HRC. High hardness can be maintained at 900 to 1000 ° C with excellent wear resistance. The cemented carbide has been made by a series of refractory metal carbides such as WC, TiC, NBC, and Vc with a powder metallurgical method as a binder. Compared with the superhard material, it has high toughness. Compared to high-speed steel, it has high hardness and wears resistance.
Hardness is an important performance indicator for measuring metal materials, which is the ability of a material to resist elastic deformation, plastic deformation and damage. If other factors have not been considered, the relationship between hardness and wear resistance is that the higher the hardness, the better the wear resistance. Relatively, the same material has different surface treatments, and the hardness is proportional to wear resistance.
However, the material with the best wear resistance doesn’t surely have a high hardness. For example, the hardness of cast iron which is the common wear-resistant material is not high.
Production Process Of Carbide Wear Parts
When the carbide wear parts are made, the particle size of the selected raw material powder is between 1 and 2 microns with high purity. The raw material is an ingredient according to the specified composition, and the alcohol or other medium is added to the wet ball mill for wet grinding, so that they are mixed, pulverized, dried, and sieved to add a type of molding agents such as wax or glue. Then they are dried for the mixture. The mixture granulates, the mold is heated to approaching the bonding metal melting point (1300 to 1500 ° C), and the hardened phase forms a eutectic alloy with the bonded metal.
After cooling, the hardening phase is distributed in the grid composed of bonded metal, close to each other, forming a strong whole. The hardness of the carbide wear parts depends on the content of the hardening phase and the particle size of the grain, that is, the higher the hardening phase content, the finer the grains, the higher the hardness. The toughness of the wear parts is determined by the bond metal, the higher the bond metal content, the greater the bending strength.
Applications Of Carbide Wear Parts
The tungsten carbide wear parts have a series of excellent performance, good wear resistance, high strength and toughness, heat resistance, corrosion resistance, etc., especially their high hardness and excellent wear resistance, providing powerful product support and excellent performance for industrial production, helping improve production efficiency and extend the service life of the equipment.
Applications
1.Suitable for making cast iron rolls and high-nickel-chromium rolls to repair molded knives.
2. Used for making unloading plates, stamping die, convex mold, electronic level molding, and other stamping dies.
3. In the pump, compressor and mixer, the tungsten carbide seal is applied as a mechanical sealing surface.
4. Carbide wear parts can be used on the metal ring in the spinning and weaving industry, which is to prevent rumors and displacement of phenantomers from rotating at high speeds and allows the machine to operate smoothly.
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