The importance of motorcycle helmets

Quality helmets are expensive, so it's important to buy the right motorcycle helmet for your budget, head shape, riding style and preferences.

1、Understand the principle of motorcycle helmets

In general, motorcycle helmets consist of four main components:Hard outer casing - specifically designed to absorb and dissipate impact forces.Internal foam (typically polystyrene) – absorbs the impact of the inside of the helmet on the head while also reducing the impact on the brain.Chin safety harness - Make sure the helmet is on the head.Soft lining - Maximizes wearing comfort and fit.

2. Choose helmets that meet recognized safety standards and regulations
The helmet is the most important safety gear for motorcyclists, not for being cool. No matter how cow's stickers and patterns are not an important part of the helmet, it will not form even a little protection for your head. So when you choose a helmet, don't trust the sticker on it, and don't just look at how beautiful its pattern is, but whether it passes the safety certification.

There are many helmet testing organizations in the world, such as DOT and Snell in the United States, ECE in Europe, JIS in Japan, and China has its own set of safety standards called GB. The safety standards issued by these agencies have varying degrees of binding in the helmet industry. For example, DOT is the English abbreviation of the US Department of Transportation, which means that DOT is a safety standard established by the United States, and Snell is the SneII I MemoriaI Foundation. A non-profit organization that studies, educates, tests, and develops safety standards, but its influence and authority have been well-known throughout the United States, and even globally.

3. Try to choose the full face helmet

Common types are half helmets, 3/4 helmets, full helmets, open helmets, and combination helmets. Some riders prefer half-helmets or 3/4 helmets, and feel that they can eat, drink, and even smoke when waiting for a red light, and they like the feeling of the wind blowing on their faces. However, you must know that there is a feeling of wind blowing, there is a danger of injury when there is a collision, even if there is no collision, the stones flying on the road, the flying insects, or even the debris falling from the truck. Can easily hit you

Most helmets have been tested in wind tunnels. It guarantees that the wind will not break your neck when driving at extreme speeds above 180km/h, and it will greatly reduce your riding during daily driving. Shoulder and neck fatigue during the course of the trip.

4.Ensure that the lens is clear enough

Whether driving a car or driving a motorcycle, it is driving. Then your first priority is to be able to see the situation in the front area, so your helmet lens is equally important. Most of the outer lenses are injection molded, which basically ensures that the field of view is clear enough, but it does not rule out that some inferior helmets are artificially bent into the shape of a helmet, so be sure to open and close the mask repeatedly when purchasing. Ensure that the line of sight is not affected.

5.Make sure the helmet is well vented.

Allowing airflow through the helmet is not only for smooth breathing, but more importantly, it can discharge harmful gases accumulated in the helmet in a timely manner. The certified helmets are usually provided with ventilation holes on the chin and overhead, and can be adjusted. When buying a helmet, be sure to try to ventilate the ventilation holes in all parts of the helmet. The easiest way is to use your mouth to blow air from the outside. If your hand can feel the airflow in the helmet, then this ventilation is proved. The hole is working properly.

Model: RHPB8-3000-Specification of RMHP Hairpin Bender

Model: RHPB8-3000-Specification of RMHP Hairpin Bender
-Tube specification: 4 * 5mm & 4* 7mm
-Length of hairpin: 200-3000
-Material: Copper







Structure & operation:
RHPB8-3000 Model hairpin bender quoted here consist of:
-Powered uncoiler station
-A changeable rerounding & straightening system to allow for further diameter changes.
The rounding & straightening wheels are set on both the vertical and horizontal plane,which will straight the tubes from the 2 plates. Each tube has 2 rounding wheels and 12 straighten wheels.

The feeding system is a hydraulically driven friction feeding device, with air cylinders controlling the actual pressure applied to the individual feed belts. When feeding, individual air cylinders will apply proper pressure to each of the belts. The upper and bottom belts will clamp one copper tube and feed to proper length.when the proper length is almost achieved. The feeding speed will change from fast to slow, and the air cylinder pressure on the belt will change from high to low. Each air cylinder will lose almost all pressure when the tube it is feeding reaches the final proper position against a Hard Stop plate. It will hold that tube in place until all tubes have achieved the final proper position. Thus all hairpin ends are in the same final location assuring both the consistence of hairpin length and equality of leg lengths.

A fixed location cutting system
The copper tubing cutting system utilizes outer rotating cutter blades to cut the tube. Lubrication takes place.
The feed belts reverse and separate the tube ends after cutting.

Bending system
The bending system can move in the length direction to produce hairpin of different lengths. The leg length is set from the PLC and Programming is fully automatic
The bend system is servo driven.
This is allows for much better accuracy and less free play or back lash then the older type of hydraulically driven bending heads found in many competitor's units.

In addition:
"Quick Change" Tube support booms are provided to support the guide tubes and allow change from one length to another in less than 2 minutes
The Hairpin Bender will be capable of receiving such special sets of bend tooling as may be dictated by specific bend radius requirements and / or changes in tubing diameter up to16mm maximum.
A sensingdevice is provided in each lubrication tank to monitor the level of oil to prevent operating the equipment without proper lubrication. A corresponding diagnostic message will be displayed on the touch screen when the level is low

An tube pick off device is included which will support the tubes while stripping and lay them down in the tube collectors. This will produce straighter hairpins for longer lengths.

There is a tube end Sizer attachment to re-open the ends of the hairpins that do not passover the mandrels;
Automatic set-up of the hairpin bender and leg length adjustments can be accomplished through the use of a standard programmable controller interfaced with a touch screen. This also provides diagnostic information for trouble shooting, Semi-automatic control and manual actuation of all machine functions. Additionally, The machine is capable of automatically positioning to specific hairpin length. Both legs of hairpin are adjustable through the touch screen and can be moved either independently or together by dedicated servo motors. The motors are capable of running at both fast and slow speeds to decrease setup time and facilitate precision adjustments. Over-travel switches on each axis help protect the machine with digital readouts on the touch screen display the current and target location in increments of 0.1mm. After the target location on each axis has been reached, hydraulic clamps lock in place to prohibit drifting.Cable/hose carriers are provided to the back of the machine and the switch tower area to prevent hose and cable damage and imprve the general esthetic of the equipment


（*Please adjust the Video to be HD quality Playing if it is not clear)


（*Please adjust the Video to be HD quality Playing if it is not clear)


Thank you take time to check all detail.

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RETA MACHINE CO.,LTD

Add: Yunshan Industry Zone, Shanqi Town, Yuyao,
315000, Ningbo,China
Tel: +0086-574-81106661
Email: info@retamachine.com
Web:www.retamachine.com

What is the mixing diode

The mixing diode is a Schottky barrier diode. Compared with the general diode, it has the characteristics of high frequency, low noise and small reverse current due to the use of majority carriers and no minority carrier storage effect. Mainly used for mixers.

The mixing diode is made by using a metal formed by contact between a metal and an n-type semiconductor. When the metal is in contact with the semiconductor, a Schottky barrier that blocks the passage of electrons, that is, a surface barrier, is formed at their interface. In order for a carrier in a semiconductor to easily cross the barrier into the metal, it must employ an n-type semiconductor that has a much larger electron work function (the energy required to run out of the semiconductor or metal surface) than the metal. When the diode is forward biased, the barrier drops and most of the carriers (electrons) enter the metal from the semiconductor.

Difference between ink roller and water roller of printing press machine and cause of wear

The rubber rollers of printing press machine play an important role in the printing process, but in actual production, many printing companies will soon need to replace the original rubber rollers. Due to insufficient cleaning and maintenance of the rubber rollers by most manufacturers, the original rubber rollers are prematurely aged, causing printing failures and cost loss.

Ink roller
Ink roller refers to the rubber roller in all ink supply systems. The role of the ink roller is to quantify and uniformly transfer the printing ink to the printing plate, which can be divided into three types: ink, ink transfer, and printing plate.
The ink is used to extract a fixed amount of ink from the ink fountain and then transfer it to the transfer roller. The ink transfer roller receives these inks and distributes them evenly to form a uniform ink film. It is then passed to the platen roller, which is responsible for distributing the incoming ink on the printing plate. At this point, the task of the ink roller is completed.

In offset presses, rubber rollers and hard rollers are always spaced apart to form a soft-hard alternate arrangement. This arrangement is more conducive to ink transfer and uniform distribution. The function of the ink roller can further strengthen the axial distribution of the ink. When it is working, it also rotates in the axial direction and performs a series of axial translation. Therefore, it is called an ink roller.

The ink roller is used to transfer ink, so the rubber must be ink-friendly. Due to the long-term contact between the adhesive layer and the ink, it must have certain resistance to ink corrosion. At the same time, the speed of the offset press is very high, and the speed of the ink roller is also very high, which causes serious heat generation of the adhesive layer, thereby accelerating the aging of the rubber. Therefore, to make the rubber roller durable, the requirements on the rubber material are also very high.

Water roller
The water roller is a rubber roller in the water supply system, similar to the ink roller, and its function is to uniformly transport water to the printing plate. Water rollers also have water, water, and plate. At present, there are two types of water supply methods for water rollers. One is the continuous water supply method. The water supply amount is achieved by adjusting the speed of the bucket roller, which is suitable for high-speed printing. The other is intermittent. The platen roller is covered with a fleece cover, and the water roller swings back and forth to supply water.

The water roller is used to transfer water, so it must be hydrophilic and resistant to water corrosion, and its hardness is usually lower than that of the ink roller.Ink rollers and water rollers of offset printing presses traditionally use nitrile rubber, but they have their own emphasis on the formula of rubber compounds. Of course, other materials can also be used as long as they meet the requirements for use.

Causes of Rubber Roller Wear
1. Improper pressure adjustment of the ink roller will cause wear of the ink roller, especially if the pressure is heavy on one side and light on the other, it will easily cause damage to the rubber roller.
2. Forgetting to close the handles on both ends of the water bucket roller will cause the colloid of the metering roller to tear and damage. If one end is not closed or the other end is not in place, the metering roller and the plate-type water roller will be worn.
3. During the plate loading process, the PS plate is not installed properly, the bite of the PS plate and the tension screw at the end of the plate are not tightened. The PS plate will wear out the rubber roller due to the untensioned part and the protruding protrusions; The plate is too tight or the top plate is too powerful, which causes the plate to deform or rupture and damage the ink roller, especially because the plate water roller has low rubber hardness and its damage is also * obvious.
4. In the printing process, when printing a long order, the running conditions of the two ends and the middle are different, which will cause the two ends of the ink roller to wear.
5. Poorly printed film. The powder and sand particles falling off the film will cause the ink roller and copper roller to wear.
6. Use a sharp tool to draw a gauge line or make other marks on the printing plate, resulting in damage to the ink roller.
7. During the printing process, due to the poor local water quality and high hardness, and the printing plant did not install a proper water treatment device, the surface of the ink roller accumulated calcium compounds, which increased the rubber hardness and increased friction. This problem not only causes wear of the ink roller, but also causes serious print quality problems.
8. The ink roller is not regularly maintained and recycled.
9. The ink on the surface of the metering roller will not cause abrasion if it is not washed for a long time.
10. Special processes, such as printing gold and silver cardboard, stickers or films, require special inks and special additives, which will accelerate the cracking and aging of rubber rollers.
11. The roughness of ink particles, especially the roughness of UV ink, has a direct impact on the wear of rubber rollers.
12. The speed of wear of rubber rollers in different parts is different. Such as the ink transfer roller, because its action is stationary → high speed → stationary continuously reciprocating, its wear degree is faster than ordinary.
13. When the rubber roller is stationary for a long time when it is stopped for a long time, the rubber diameter of the rubber roller is uneven, and the rotation and deformation of the rubber roller are different, which exacerbates the wear of the rubber roller.
14. The temperature control of the working environment is not good. It exceeds the physical properties of the rubber roller and increases the wear of the rubber roller.

How To Design Cleverly LED Waterproof Power Supply?

In a wide range of applications of power supplies, as a professional power supply for LEDs, most of them require a certain waterproof function, and have high requirements for the level of waterproofing. Regardless of whether the requirements are waterproof, but also the ability to adapt to the ambient temperature and the operating conditions of equipment in severe weather have high requirements.
Waterproof power supply must have certain requirements for its insulation and working temperature. The working temperature of the led waterproof switching power supply is generally -40 -80 ° C (outer surface temperature of the case), the storage temperature is -40 -85 ° C, and the working humidity is 10-90% relative humidity.
LED waterproof switching power supply has great requirements for the working environment and has been widely used in daily life. So, what characteristics does it have?
1. High reliability: Especially the driving power sources like LED street lights are at high altitude, so it leads to inconvenience of maintenance, and the cost is even greater.
2. High efficiency: LED is an energy-saving product, and the efficiency of the driving power supply must be high. For the power supply, the structure placed in the led lamp is very important.
The luminous efficiency of LED will decrease with the increase of LED temperature, so the heat dissipation of LED is especially important. When the efficiency of the power supply is high, the power loss of the power supply becomes smaller, the heat generation in the LED lamp will also be reduced, and the temperature of the lamp will be reduced accordingly, which is beneficial to delaying the light decay of the LED.
3. High power: The power factor is the load requirement of the grid. Generally, there are no mandatory indicators for electrical appliances below 70 watts.
4. Driving mode: one constant voltage source provides multiple constant current sources, and each constant current source supplies power to each LED individually. Its advantage is that the combination is flexible, and the failure of all the LEDs will not affect the normal operation of other LEDs, which will be higher for cost.
The second type is direct constant current power supply, and the LEDs are operated in series or in parallel, but there is a obvious disadvantage that it is poor flexibility.
These two forms coexist for a period of time, and multiple constant current output power supply methods will be better in terms of cost and performance.
5. Surge protection function: LED's ability to resist surge is relatively poor, especially its ability to resist reverse voltage. For example, led lamps installed outdoors, due to the start-up of the grid load and the induction of lightning strikes, various surges can be invaded from the grid system, and some surges can cause damage to LEDs. Therefore, the LED drive power must have the ability to suppress the intrusion of the surge and protect the LED from damage.
6. Protection function: In addition to the normal protection function of the power supply, it is best to add negative feedback of LED temperature to the constant current output to prevent the LED temperature from becoming too high.
7. Protection: The type of the lamp is externally installed, the power supply structure should be waterproof and moisture-proof, and the shell should be resistant to sunlight.
8. The life of the drive power must be adapted to the life of the LED.
9. To meet the requirements of safety regulations and electromagnetic compatibility.
LED waterproof power supply supplies are mostly used to provide driving capabilities for various LED lamps, such as LED spotlights, LED street lights, LED underground lights, LED ceiling lights, and LED panel lights. The biggest feature of the led power supply is that it is waterproof and can be used outdoors. At the same time, it is not afraid of bad weather such as rain, fog and direct sunlight.