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Tuesday, June 22, 2021

HLAA News: “Overcoming Hearing Loss” – The Latest Podcast from The People’s Pharmacy

HLAA News: “Overcoming Hearing Loss” – The Latest Podcast from The People’s Pharmacy

Link to Hearing Loss Association of America

“Overcoming Hearing Loss” – The Latest Podcast from The People’s Pharmacy

Posted: 22 Jun 2021 10:13 AM PDT

Barbara Kelley is the executive director of the Hearing Loss Association of America. She can be reached at bkelley@hearingloss.org. Follow her on Twitter @Bkelley_HLAA. When the producer of NPR's...

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Tuesday, June 15, 2021

Imported CNC lathe processing machine tool equipment and debugging

After the CNC machine tool is produced by the manufacturer, the machine tool has been subjected to various requirements and inspections, and only after passing the inspection, can it leave the factory. Regarding medium and large CNC machine tools, because the machine tools are large in size and not convenient for transportation, they must be distinguished and transported to the user after they collapse before they can be used before they can be reassembled and debugged. As for small machine tools, the float level gauge does not need to crash the machine tool during transportation, so the installation, debugging and acceptance tasks of the machine tool are relatively simple.

 

After the machine is transported to the user, it can be put into operation formally after simple connection, adjustment of the machine level and trial cutting, and the things required are relatively simple. The following introduces the equipment, debugging and acceptance requirements of small CNC machine tools.

 

First, the initial installation content of imported CNC lathe processing machine tools includes: according to the requirements of the machine tool, select the appropriate position to place the machine tool; read the material of the machine tool to ensure the accurate use of the CNC machine tool.

  

2. Wire connection processed by imported CNC lathes: This part of the content is mainly the main power connection of the machine tool. Although the step of the magnetic cnc milling column level gauge is very simple, if this step is not done well, it will cause unnecessary troubles, or even Severe results will occur. Here are some considerations for power connection:

  

1. Confirm the input power voltage and frequency. The current voltage power supply in our country is: three-order AC 380V; single-phase 220V. Domestic machine tools generally use three-phase 380V, frequency 50Hz power supply, and some imported machine tools do not use three-order AC 380V, frequency 50Hz power supply, and these cnc bending machine tools are equipped with power transformers, and users can choose according to the requirements. The next step is to reflect on the up and down fluctuations of the power supply, whether the glass tube level gauge can meet the requirements of the machine tool, whether there is a large fluctuation in the vicinity of the machine tool that can affect the power supply, if the voltage fluctuation is too large or there is a large-scale equipment, a stabilizer should be installed , Because the power supply does not fluctuate and the electrical disturbance occurs, the machine tool will affect the invariance of the machine tool.

  

2. The phase sequence of the power supply processed by the imported CNC training is confirmed. When the phase sequence is wrong, there is a fuse that can blow the control unit. The method of reflecting the phase sequence is relatively simple. Use the phase sequence to connect to the following figure to measure, when the phase sequence table is in sequence When the hour hand is twisted, the phase sequence is accurate. Otherwise, the phase sequence is wrong. At this time, you only need to swap any two power cords in the UVW three-phase.


Dimensional control skills for stainless steel parts processing


Modify tool offset value to ensure dimensional accuracy

 

According to stainless steel parts machining manufacturers, when the workpiece error exceeds the workpiece tolerance due to the first tool setting error or other reasons, and the processing requirements cannot be met, the workpiece can be modified to achieve the required size by modifying the tool compensation. The method to ensure the radial size is as follows:

 

Absolute coordinate input method

 

According to the principle of "large reduction, small increase", modify the tool compensation at 001004. If the workpiece size is larger by 0.1mm when cutting the groove with the No. 2 cutting tool, and the tool compensation display at 002 is X3.8, you can enter X3.7 to reduce the No. 2 tool compensation.

 

Relative coordinate method

 

As in the above example, input U-0.1 at 002 cutter compensation, and the same effect can also be obtained.

The same is true for the cnc operating of the axial size. For example, if you use the No. 1 external tool to machine a certain shaft segment, and the size is longer than 0.1mm, you can enter W0.1 at the 001 tool offset.

 

Semi-finish machining eliminates the influence of screw gap to ensure dimensional accuracy

 

According to the analysis of stainless steel parts processing manufacturers, for most CNC machining, after a long period of use, due to the influence of the screw gap, the size of the processed workpiece often appears unstable. At this time, we can perform a semi-finishing process after roughing to eliminate the influence of screw clearance. For example, after rough machining the outer circle with No. 1 tool G71, you can input U0.3 at 001 tool compensation and call G70 fine turning once. After stopping the measurement, input U-0.3 at 001 tool compensation and call G70 fine turning again. . After this semi-finished turning, the influence of the screw gap is eliminated, and the stability of the dimensional accuracy is ensured.


What is the reason for the high temperature of the die-casting mold?

In the process of using the die-casting mold, we need to understand the reason why the temperature of the die-casting mold becomes higher, so what is the specific reason? Let's take a look together below.

Many accessories used by people in daily life are manufactured by die-casting molds, so this mold technology is in great demand in the market. In the shopping malls, due to the increase in demand, the development of Kaiping die-casting manufacturers has gradually expanded along with the economy. However, what is the result of the high surface temperature of the die-casting mold? Here is a brief introduction to the problem, hoping to bring help to those in need.
Casting standards will be affected: the surface temperature of the die-casting mold is closely related to the standard accuracy of the casting. If the surface temperature does not meet the requirements or the temperature spread is unreasonable, the casting will have poor standard accuracy due to uneven heating. The phenomenon appears. So from this perspective, the temperature issue must be paid attention to.
The appearance of the casting will be affected: the surface temperature of the die casting mold will definitely affect the appearance of the casting. If the temperature is unreasonable, it will simply cause severe deformation of the casting, such as unevenness and shrinkage. It is necessary to know that the impact of appearance will have a great impact on product sales, so the appearance quality of castings must be paid attention to.
Standard accuracy and appearance quality will be greatly affected, which is caused by the surface temperature of the die-casting mold, so people must control the surface temperature of the mold at any time during processing.

T Copyright notice: This article comes from https://diecastingmanufacturer.com/

Please keep the source and address of this article for reprinting: https://diecastingmanufacturer.com/what-is-the-reason-for-the-high-temperature-of-the-die-casting-mold/

 


Thursday, June 10, 2021

Knowledge of aluminum processing technology

Aluminum is the most widely used and widely used metal material among non-ferrous metals, and its application range is still expanding. There are many kinds of aluminum products produced using aluminum, and there are more than 700,000 types according to statistics. Various industries such as construction and decoration, transportation, and aerospace have different needs. Today I will introduce to you the processing technology of aluminum products and how to avoid processing deformation.

Wednesday, June 9, 2021

HLAA News: HLAA Joins Consumers Commenting on FCC Rules

HLAA News: HLAA Joins Consumers Commenting on FCC Rules

Link to Hearing Loss Association of America

HLAA Joins Consumers Commenting on FCC Rules

Posted: 08 Jun 2021 02:46 PM PDT

HLAA signed onto comments drafted in concert with TDI (Telecommunications for the Deaf and Hard of Hearing) and other Accessibility Advocacy Organizations and Research Organizations that were filed...

Blog content summary only, click the Blog Title to Read More...

Monday, June 7, 2021

What are the requirements for the runners of die-casting molds?

The runners of die-casting molds have corresponding requirements, so we need to understand these requirements as much as possible, which is of great help for us to use die-casting molds.

Sunday, June 6, 2021

Die casting mold stress

During the use of die-casting mold, the die-casting mold will have stress. So what is the reason for this situation? Let's take a look at the causes of stress in the lower die-casting mold.

CM200DU-24H

Mitsubishi CM200DU-24H

#CM200DU-24H Mitsubishi CM200DU-24H New IGBT: 200A1200V; POWEREX CM200DU-24H IGBT MODULE 1.2KV 200A MODULE , CM200DU-24H pictures, CM200DU-24H price, #CM200DU-24H supplier

 CM200DU-24H
Collector Emitter Saturation voltage Vce(on): 1.2kV
Collector Emitter Voltage V(br)ceo: 1.2kV
DC Collector Current: 200A
No. of Pins: 7
Operating Temperature Max: 150°C
Power Dissipation Pd: 1.13kW
SVHC: To Be Advised
Transistor Case Style: Module
Transistor Polarity: N Channel

IGBT: 200A1200V; POWEREX CM200DU-24H IGBT MODULE 1.2KV 200A MODULE

Wednesday, June 2, 2021

What should I pay attention to in the die casting of aluminum alloy?

Aluminum alloy die-casting products are mainly used in electronics, cars, motors, and some communication industries. Of course, the primary use is still in the parts of some equipment. So what should we pay attention to in the die-casting of aluminum alloy?

 

1. Consider the issue of demolding,

 

2. Considering the wall thickness of aluminum alloy die-casting, too much thickness will affect the filling

 

3. In the structure, try to avoid the appearance of the structure that causes the mold structure to be messy, and have to use multiple core pulling or spiral core pulling

 

4. The appearance of some die castings may have special requirements, such as oil injection

 

5. Consider the mold problem when designing. Assuming there are multiple orientations of core-pulling positions, try to put both ends, preferably not in the lower position of the core-pulling, so that the aluminum alloy die-casting will cause problems with the core-pulling.

 

Pay special attention to the following points in the use of aluminum alloy die-casting molds:

 

1. It is very troublesome to organize the parting surface of the mold, and it is also very simple to ignore. Assuming that the boss has a high starting point and buys a good mold, then the job is much easier. If the quality of the mold is not good, it is produced. It is inevitable that there will be flashes or dirt on the parting surface of the mold. The operator should always tidy up these parts and equip a small spatula at any time.

 

Assuming that the flash is not removed in time, the parting surface of the mold is simply collapsed, and the aluminum is formed in the production process. Once this result is formed, no matter how good a mold repair expert you are, the possibility of complete repair is very small. Yes, it's not that they don't have the skills.

 

 

 

The emergence of the achievements made by running aluminum not only increases the cost of die-casting, wastes the aluminum in vain, and the product quality is also unstable, especially the internal quality. It also increases the difficulty of confirming the process parameters, and the pass rate will drop a lot. From safety considerations, Increased the chance of work-related injuries.

 

During the shift, the operator thoroughly cleans the parting surface of the mold with kerosene, which not only prevents the mold from being crushed, but also after cleaning, the mold can be blocked by the residue of the release agent or other dirt. The exhaust groove is opened, which is conducive to the discharge of the gas in the cavity during the injection process to advance the product quality. It is advisable for a team to clean the parting surface twice. Let employees develop an outstanding habit.

 

2. When each team takes over, check carefully according to the "Mold Check List" of our company, and solve the problems in time to avoid unnecessary troubles for themselves.

 

3. Application of mold cooling system. When the mold cooling water is used correctly, it not only extends the service life of the mold, but also improves the metal machining efficiency. In actual production, we often neglect its importance. The operators also try to save energy. If it is too troublesome to connect and connect, they will not connect the cooling water pipe. Some companies even save the cost when customizing the mold. Cooling water then constitutes a very serious result.

 

The material of the mold is generally made of special mold steel through various treatments, and even the best mold steel has its limits of use, such as temperature. When the mold is in use, assuming that the mold temperature is too high, it is very simple that tortoise cracks appear on the surface of the mold core early, and some molds even have large areas of tortoise cracks before they exceed 2000 times.

 

Even during the production of the mold, the color of the mold core changed because the mold temperature was too high. After measurement, it even reached more than 400 degrees. When this temperature is quenched by the release agent, it is very easy to crack, and the product is produced. It is also briefly deformed, strained, sticky and other conditions appear.

 

Under the condition of using mold cooling water, the use of mold release agent can be greatly reduced, so that the operator will not use mold release agent to lower the temperature of the mold. The advantage is that it can effectively extend the life of the mold, save the die-casting cycle, improve the quality of the product, reduce the occurrence of mold sticking, strain and aluminum sticking, and reduce the use of mold release agents. It can also reduce the loss of ejector pins and cores due to overheating of the mold.

 

4. It is necessary to preheat the mold during the initial production machining to avoid the occurrence of turtle cracks when the cold mold suddenly encounters hot molten metal. The messy mold can use blowtorch and liquefied gas, and the conditions are good. For the mold temperature machine, the simpler mold can be preheated by slow injection.

 

5. Assuming that the mold is equipped with neutron control, be careful to prevent the signal line between the die casting machine and the mold from being connected. The reason is very clear. In daily production, it is difficult to avoid water on the signal line, which may be caused by the joints. The local is simply broken.

 

Then the composition is short-circuited with the machine tool. If a signal error is formed, it will alarm and proactively stop and delay the time, or the signal will be disordered and the mold will be broken. Constitute unnecessary discards. Pay attention to the waterproof of the travel switch.


Tuesday, June 1, 2021

CNC turning and milling composite processing manufacturers explain the selection of lathes


1. Preparation

 

The CNC turning and milling composite processing manufacturer introduced the process requirements of typical parts and the batch of processed workpieces. The function that the CNC lathe should have is to make preparations and the prerequisites for the reasonable selection of CNC lathes. Meet the process requirements of typical parts

 

The process requirements of typical parts are mainly the structural size, processing range and accuracy requirements of the parts. According to the accuracy requirements, that is, the dimensional accuracy, positioning accuracy and surface roughness of the workpiece, the control accuracy of the CNC lathe is selected.

 

Choose based on reliability. Reliability is a guarantee for improving product quality and production efficiency. The reliability of a CNC machine tool means that the machine tool runs stably for a long time without failure when it performs its functions under specified conditions. That is, the mean time between failures is long, even if there is a failure, it can be restored in a short time and put into use again. Choose machine tools with reasonable structure, well-manufactured, and mass-produced machines. Generally, the more users, the higher the reliability of the CNC system.

 

2. Purchase of machine tool accessories and tools

 

According to the analysis of CNC turning-milling composite processing manufacturers, the machine tool accessories, spare parts and their supply capacity, and cutting tools are very important to the CNC machining and turning centers that have been put into production. When choosing a machine tool, carefully consider the compatibility of tools and accessories.

 

3. Focus on the identity of the control system

 Manufacturers generally choose products from the same manufacturer, and should at least purchase control systems from the same manufacturer, which brings great convenience to the maintenance work. Teaching units require students to be knowledgeable and knowledgeable, so it is a wise choice to choose different systems and equip them with various simulation software.

 

4. Choose according to the performance-price ratio

 Introduced by CNC turning-milling composite machining manufacturers, to ensure that the functions and accuracy are not idle, not wasted, and do not choose functions that are not related to your needs.


Introduction to the method of aluminum alloy die casting to solve casting porosity

Method to solve casting porosity

 

First analyze the reasons for the formation of stomata, and then take corresponding measures.

 

(1) Choose dry and clean alloy materials.

 

(2) Do not overheat or degas the melt under control.

 

(3) Reasonably choose the casting process parameters, especially the injection speed. The starting point for speed-regulating high-speed machining.

 

(4) Sequential filling helps to discharge the cavity gas. Pouring I: 1, and the runner has sufficient length. It should be 50 ram, which is conducive to the smooth flow of alloy liquid and gas discharge.

 

The thickness and direction of I:1 can be changed, and overflow grooves and exhaust grooves are set at the holes. The sum of the cross-sectional area of ​​the overflow product is not less than 60% of the sum of the cross-sectional area of ​​the gate part, otherwise the slag discharge effect will be poor.

 

(5) Choose good performance paint and spray volume control.

 

Choose the right die casting machine

 

 

 

Die-casting machine is the key equipment for die-casting production, and its performance objectively determines the quality of die-casting parts. The correct choice of die-casting machine is essential to ensure product quality, improve production efficiency and reduce production costs. The performance of the die casting machine depends on two aspects.

 

Sufficient clamping force: to prevent the flow pressure of the molten metal from reaching high peaks, and to prevent flashing and flying materials.

 

Sufficient injection capacity: to ensure that the stand casting process will not cause overheating or a large amount of overflow of the mold, and at the same time ensure that the machine has enough capacity to transport enough molten metal and fill the cavity as required to accelerate the speed in a short time.

 

Design of Die Casting Mould Runner

 

Because the zinc alloy must fill the cavity in a short time, the design and manufacturing of the die-casting mold and its runner system are much higher than that of the plastic mold.

 

The runner system guides the metal solution to fill the cavity in some way. It plays an important role in the flow direction of the metal liquid, pressure transmission, filling time, exhaust conditions and mold temperature distribution.

 

It is also an important factor that determines the quality of die castings.

 

The design principle of the die-casting mold runner system should be summarized from the gooseneck to the gate to avoid sharp corners, and the runner surface should be smooth to reduce resistance and maintain the flow rate of the liquid zinc alloy.


Sunday, May 30, 2021

CM150DU-24F

Mitsubishi CM150DU-24F

#CM150DU-24F Mitsubishi CM150DU-24F New 150A/1200V/IGBT/2U;IGBT MOD DUAL 1200V 150A F SER , CM150DU-24F pictures, CM150DU-24F price, #CM150DU-24F supplier
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Email: sales@shunlongwei.com 

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CM150DU-24F
Category Discrete Semiconductor Products
Family IGBTs – Modules
Manufacturer : Powerex Inc.
Series IGBT MOD™
IGBT Type Trench
Configuration Half Bridge
voltage – Collector Emitter Breakdown (Max) 1200V
Current – Collector (IC) (Max) 150A
Power – Max 600W
Vce(on) (Max) @ Vge, IC 2.4V @ 15V, 150A
Current – Collector Cutoff (Max) 1mA
Input Capacitance (Cies) @ Vce 59nF @ 10V
Input Standard
NTC Thermistor No
Mounting Type Chassis Mount
Package / Case Module
Supplier Device Package Module
 

150A/1200V/IGBT/2U;IGBT MOD DUAL 1200V 150A F SER

Saturday, May 29, 2021

G084SN05 V3

AUO G084SN05 V3

#G084SN05 V3 AUO G084SN05 V3 New AUO 8.4inch Panel 800×600 500:1 262K CCFL LVDS , G084SN05 V3 pictures, G084SN05 V3 price, #G084SN05 V3 supplier
——————————————————————-
Email: sales@shunlongwei.com sales[email protected]

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Panel Brand : AUO
Panel Model : G084SN05 V3
Panel Type : a-Si TFT- LCD , Panel 
Panel Size : 8.4 inch
Resolution : 800(RGB)×600 , SVGA 
Display Mode : TN, Normally White, Transmissive 
Active Area : 170.4×127.8 mm
Outline : 203×142.5 mm
Brightness : 450 cd/m² (Typ.) 
Contrast Ratio : 500:1 (Typ.)  
Display Colors : 262K   (6-bit)
Response Time : 10/25 (Typ.)(Tr/Td) 
Viewing Angle : 60/60/60/40 (Typ.)(CR≥10) (L/R/U/D) 
Frequency : 60Hz  
Lamp Type : 2 pcs CCFL   
Signal Interface : LVDS (1 ch, 6-bit)  
Input voltage : 3.3V (Typ.) 

FP40R12KT3

Eupec FP40R12KT3

#FP40R12KT3 Eupec FP40R12KT3 New IGBT Modules N-CH 1.2KV 55A, FP40R12KT3 pictures, FP40R12KT3 price, #FP40R12KT3 supplier
——————————————————————-
Email: sales@shunlongwei.com [email protected]

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FP40R12KT3 FP40R12KT3
Manufacturer: Infineon
Product Category: IGBT Modules
RoHS: YES
Product: IGBT Silicon Modules
Configuration: Hex
Collector- Emitter voltage VCEO Max: 1200 V
Continuous Collector Current at 25 C: 55 A
Maximum Operating Temperature: + 125 C
Package / Case: Econo 2
Packaging: Tray
Brand: Infineon Technologies
Maximum Gate Emitter Voltage: +/- 20 V
Minimum Operating Temperature: – 40 C
Mounting Style: Screw
Factory Pack Quantity: 10
 

IGBT Modules N-CH 1.2KV 55A

BSM15GD120DN2E3224

Eupec BSM15GD120DN2E3224

#BSM15GD120DN2E3224 Eupec BSM15GD120DN2E3224 New IGBT Modules N-CH 1.2KV 25A , BSM15GD120DN2E3224 pictures, BSM15GD120DN2E3224 price, #BSM15GD120DN2E3224 supplier
——————————————————————-
Email: sales@shunlongwei.com

——————————————————————-

BSM15GD120DN2E3224
Manufacturer: Infineon
Product Category: IGBT Modules
RoHS: YES
Product: IGBT Silicon Modules
Configuration: Hex
Collector- Emitter voltage VCEO Max: 1200 V
Collector-Emitter Saturation Voltage: 2.5 V
Continuous Collector Current at 25 C: 25 A
Gate-Emitter Leakage Current: 150 nA
Maximum Operating Temperature: + 150 C
Package / Case: EconoPACK 2
Brand: Infineon Technologies
Maximum Gate Emitter Voltage: 20 V
Minimum Operating Temperature: – 40 C
Mounting Style: Screw
Pd – Power Dissipation: 145 W
Factory Pack Quantity: 10

IGBT Modules N-CH 1.2KV 25A

Mitsubishi CM50MD-12H

Mitsubishi CM50MD-12H Technical Infomation

#CM50MD-12H Mitsubishi CM50MD-12H New PIM: 50A600V, CM50MD-12H pictures, CM50MD-12H price, #CM50MD-12H supplier

CM50MD-12H Description

IGBT Power Module, CIB Module Three Phase Converter Three Phase Inverter Brake 50 Amperes/600 Volts, IGBT POWER TRANSISTOR MODULES MEDIUM POWER SWITCHING USE INSULATED TYPE

CM50MD-12H  0.22 lbs

Target_Applications

CM50MD-12H could be used in AC & DC motor controls, General purpose inverters, Servo drives, NC, Robotics

Features

IGBT POWER TRANSISTOR MODULE
PIM: 50A600V

AUO G121XN01 V1

AUO G121XN01 V1

#G121XN01 V1 AUO G121XN01 V1 New G121XN01 V1 AUO 12.1″ LCM 1024×768 500 700:1 80/80/80/80 16.7M WLED eDP, G121XN01 V1 pictures, G121XN01 V1 price, #G121XN01 V1 supplier

Brand AUO
Model G121XN01 V1
Diagonal Size 12.1 inch
Type a-Si TFT-LCD, LCM
Pixel Format 1024(2)×768(2)  [XGA]  105PPI
Configuration RGBW Rectangle
Active Area 245.76(H)×184.32(V) mm
Luminance 500 cd/m² (Typ.)
Contrast Ratio 700:1 (Typ.) (TM)    
Response Time 25/10 (Typ.)(Tr/Td)
Viewing Angle 80/80/80/80 (Typ.)(CR≥10) Left / Right / Up / Down
Operating Mode TN, Normally White, Transmissive
Support Color 16.7M   72% NTSC
Light Source WLED , 50K hours
Designed For Industrial
Frame Rate 60Hz 
120Hz (60HZ Input) : Embedded MEMC Circuit
120Hz+120Hz : 120Hz Panel+120Hz Backlight
240Hz (60HZ Input) : Embedded MEMC Circuit
Touch Panel Without
Interface Type eDP
Environment Operating Temperature: -30 ~ 85 °C ; Storage Temperature: -30 ~ 85 °C

Thursday, May 27, 2021

Semikron SKM300GB12T4

Semikron SKM300GB12T4

 Semikron SKM300GB12T4

#SKM300GB12T4 Semikron SKM300GB12T4 New IGBT4 = 4. Generation (Trench)IGBT 1200V/300A, SKM300GB12T4 pictures, SKM300GB12T4 price, #SKM300GB12T4 supplier
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Email: sales@shunlongwei.com https://www.slw-ele.com/skm300gb12t4.html

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SKM300GB12T4

Features
• IGBT4 = 4. Generation (Trench)IGBT
• VCEsat with positive temperature coefficient
• High short circuit capability, self limiting to 6 x ICNOM
• Soft switching 4. Generation CAL diode (CAL4)
Typical Applications
• AC inverter drives
• UPS
• electronic welders at fsw up to 20 kHz Remarks
• Case temperature limited to  Tc = 125°C max, recomm.
 Top = -40 … +150°C, product rel. results valid for Tj = 150°C

Maximum ratings and characteristics 
.Absolute maximum ratings (Tc=25°C unless without specified)
Collector-Emitter voltage Vces:1200V
Gate-Emitter voltage VGES:±20V
Collector current IC:300A
Collector current Icp:900A
Collector power dissipation Pc:1800W
Collector-Emitter voltage VCES:4000V
Operating junction temperature Tj:+150°C
Storage temperature Tstg :-40 to +125°C
Mounting screw torque 3.5 *1 N·m

IGBT4 = 4. Generation (Trench)IGBT 1200V/300A

Tuesday, May 25, 2021

Helmet

Helmet  (Device To Protect The Head)

Helmet is a device to protect the head, a hat worn by soldiers during training and combat, and an indispensable tool in people's traffic. Divided into military helmets, police helmets and civilian helmets. It is mostly semi-circular, mainly composed of three parts: shell, lining and suspension device. The shells are made of special steel, glass fiber reinforced plastic, reinforced plastic, leather, nylon and other materials to resist head damage from warheads, shrapnel and other striking objects.

Constitute
Modern helmets are mainly composed of helmet shell, lining and suspension system. Due to the different requirements for various activities, there are many helmet structures and styles.

Generally, the shell of the helmet is made of high-strength materials, such as metal, engineering plastics, Kevlar FABRIC, etc., through its deformation to absorb most of the impact; the lining material is sweat-absorbing, warm-keeping, and shock-absorbing Functional, military helmets often have the function of further reducing the impact and preventing shell fragments from hurting the head; the suspension system is the part between the shell and the inner lining, which can usually be adjusted to suit different wearers. The difference in head shape.

Some special-purpose helmets are also equipped with earphones, microphones, and sockets for additional equipment such as cameras and lighting flashlights.

Application
Helmets are used in military, construction, mining and some sports, such as American football, cycling, baseball, skiing, ice hockey, horse racing, equestrianism, sports, racing, locomotives, etc.

How to wear a helmet

The helmet should be worn horizontally, not tilting forward or backward. Some riders think that the front brim of the helmet is a bit blocking the line of sight, so they raise the helmet a lot to get a good line of sight. In fact, the brim can be removed to achieve the effect.

  

The correct helmet to wear is as follows:
Pay attention to the red and green dots on the picture. This is very important. The correct wearing of the helmet is the thickness of one finger of the helmet adjustment strap that crosses the ear (red dot), about 1.5 cm.
The entire strap is fixed on the lower jaw (green dot) instead of the throat, and the thickness of a finger is also left, about 1.5 cm.

 

Tips

1. The lighter the helmet, the better
Relatively speaking, the lighter the helmet, the better. But the lighter the riding helmet, the smaller the chance that it will pass the national safety certification test standards, and the higher the relative price. Therefore, the prerequisite for choosing a helmet is to pass the national safety certification test standard. Most helmets above 200 yuan can achieve about 260G. This weight will not make you tired even for a long distance, so don't care too much about the weight index of the helmet. Unless you are for a bicycle race. Try to reduce your own weight, otherwise, it is not worth the extra silver to buy an ultra-lightweight helmet.

2. The bigger or more holes in the helmet, the more windy the helmet
Breathability is the key to the helmet, which can keep your head dry during long-distance riding. The more or larger the ventilation holes on the helmet, the greater the airflow around your head, and the cooler you will feel. However, please keep in mind that the more or larger the ventilation holes on the helmet, the more exposed your head will be, so the degree of protection will be reduced accordingly. Compared with mountain bike helmets, road bike helmets have more or larger ventilation holes. Similarly, road bikers have to consider the weight of their helmets more than mountain bikers. Generally speaking, the lighter the helmet, the more expensive it is. Therefore, unless you are doing a bicycle race, you should reduce your own weight as much as possible, otherwise, it is not worth the extra money to buy an ultra-lightweight bicycle helmet.