According to legend, China's New Year's Day originated from Zhuan Xu, one of the Three Sovereigns and Five Emperors, and has a history of more than 3,000 years. The word "New Year's Day" first appeared in the "Book of Jin": "Emperor Zhuan took the first month of Mengxia as the Yuan Dynasty, which is actually the spring of New Year's Day in Zhengshuo". During the Northern and Southern Dynasties, Xiao Ziyun's poem "Jie Ya" in the Southern Dynasties also recorded that "New Year's Day for all four seasons, early spring for longevity". China was the first to call the first day of the first lunar month "New Year's Day". Yuan means "beginning" and "beginning", and dan refers to "days". New Year's Day collectively refers to the "initial days", which is the first day of the year. The date on which the first day of the first lunar month was calculated was also very inconsistent before Emperor Wu of the Han Dynasty. Therefore, the month and day of New Year's Day in the past dynasties are not consistent. The lunar calendar of the Xia Dynasty took Meng Xi month (Yuan month) as the first month, the Yin calendar of the Shang dynasty took the twelfth month (December) as the first month, and the Zhou calendar of the Zhou dynasty took the winter month (November) as the first month. After Qin Shihuang unified China, he took Yangchun month (October) as the first month, that is, the first day of October as New Year's Day. Starting from Emperor Wu of the Han Dynasty, Meng Xiyue (January) was designated as the first month, and the first day of Meng Xiyue (the first day of the first lunar month in the lunar calendar) was called New Year's Day, which was still used until the end of the Qing Dynasty. But this is the lunar calendar, that is, the lunar calendar or the lunar calendar, and it is not what we call New Year's Day today. In 1911 AD, the Revolution of 1911 led by Sun Yat-sen overthrew the rule of the Qing Dynasty and established the Republic of China. In order to "make Xia Zhengzheng, so it follows the agricultural time, and it is based on the Western calendar, so it is convenient for statistics", it was decided to use the Gregorian calendar in the first year of the Republic of China (actually used in 1912), and stipulated that January 1 of the Gregorian calendar (Gregorian calendar) was the "New Year", but it was not It's called "New Year's Day". What we call "New Year's Day" today is September 27, 1949. The first plenary session of the Chinese People's Political Consultative Conference decided to establish the People's Republic of China. It also decided to adopt the world's common AD calendar and change the Gregorian calendar to January 1st is officially designated as "New Year's Day", and the first day of the first lunar month is changed to "Spring Festival".

The twenty-four solar terms are twenty-four solar terms that reflect the seasonal characteristics of natural phenomena and agricultural activities in a year. That is, Beginning of Spring, Rain, Jingzhe, Vernal Equinox, Qingming, Grain Rain, Beginning of Summer, Xiaoman, Ear Grain, Summer Solstice, Minor Heat, Major Heat, Beginning of Autumn, End of Heat, White Dew, Autumnal Equinox, Cold Dew, Frost Descent, Beginning of Winter, Light Snow, Heavy Snow, Winter Solstice, Minor Cold, and Major Cold. The twenty-four solar terms are based on the solar calendar. According to the position of the sun on the ecliptic, starting from 0° of the ecliptic longitude, every 15° is a section. There is one "middle energy" and one "solar term" every month, and the whole year is divided into ten. The two "Zhong Qi" and the twelve "solar terms" will be collectively referred to as solar terms from now on, with a total of twenty-four solar terms. Names with distinctive meanings are given based on astronomical, climatic and agricultural production seasons. The twenty-four solar terms are a unique creation of ancient China, originating from the middle and lower reaches of the Yellow River. It takes the climate of the Yellow River Basin as the background and combines natural seasonal phenomena with agricultural production activities as the content. The vernal and autumnal equinoxes represent the equinox of day and night and a moderate climate; The summer solstice and winter solstice signify the arrival of summer and cold winter respectively; The beginning of spring, the beginning of summer, the beginning of autumn and the beginning of winter respectively represent the beginning of the four seasons of spring, summer, autumn and winter; Rain indicates the beginning of the rainfall season; Jingzhe is when hibernating animals begin to revive and wait for emergence; Qingming means that the weather is getting warmer, the grass and trees are new and green, and the scenery is fresh; Grain Rain is when rainfall begins to increase, which is beneficial to grain growth; Xiaoman means that the grass and trees are beginning to flourish, and the grains of summer-ripened grains are beginning to be full; Eargrass is a busy time of year for farming, and summer harvesting, summer management, and summer planting need to be carried out in a timely manner; Minor Heat and Major Heat are the hottest seasons of the year; Sushu means the end of the hot season; White dew means that the temperature has dropped, the humidity is still high, and there is a lot of dew; Cold dew means that the ground radiation cools quickly and the condensed dew has a low temperature; Frostfall means that the weather is getting colder and frost begins to form; Light snow and heavy snow indicate the beginning of snowfall season; Xiaohan and Dahan are the coldest seasons of the year.

On October 1, 1949, the founding ceremony of the Central People's Government of the People's Republic of China, that is, the founding ceremony, was grandly held in Tiananmen Square in Beijing. "The first person to propose the 'National Day' was Mr. Ma Xulun, then a member of the CPPCC and chief representative of the Democratic Progress Party." On October 9, 1949, the first National Committee of the Chinese People's Political Consultative Conference held its first session. Member Xu Guangping spoke :" Ma Xulun can not come on leave, he asked me to say that the establishment of the People's Republic of China, there should be a National Day, so I hope this Council will decide to set October 1 as the National Day." Member LAM Pok Yuen also spoke and seconded the motion, requesting discussion on the decision. On the same day, the meeting passed the proposal of "asking the government to specify October 1 as the National Day of the People's Republic of China to replace the old National Day on October 10" and sent the Central People's Government to adopt and implement. On December 2, 1949, the resolution adopted at the fourth meeting of the Committee of the Central People's Government stated :" The Committee of the Central People's Government hereby declares that, since 1950, October 1 of each year, that is, the great day on which the People's Republic of China was proclaimed, shall be the National Day of the People's Republic of China." This is why "October 1" was identified as the "birthday" of the People's Republic of China, that is, the "National Day". Since 1950, October 1 every year has become a grand celebration of the Chinese people of all ethnic groups. In the early days of the founding of New China (1950-1959), large-scale celebrations and military parades were held every year on the National Day. In September 1960, the CPC Central Committee and The State Council decided to reform the National Day system in line with the principle of building a nation through diligence and thrift. Since then, from 1960 to 1970, grand rallies and mass parades have been held in front of Tiananmen Square every year on National Day, but no military parade has been held. From 1971 to 1983, every year on October 1, Beijing celebrated the National Day with large-scale garden party activities and other forms, without mass parades. In 1984, the 35th anniversary of the National Day, held a grand National Day parade and mass celebration parade. In the following ten years, the National Day was celebrated in other forms, and no National Day parade and mass celebration parade were held. On October 1, 1999, the 50th anniversary of the National Day, a grand National Day parade and mass celebration parade were held. This was the last grand National Day celebration held by the People's Republic of China in the 20th century. The National Day of the People's Republic of China is a symbol of the country, which appears with the emergence of the country and becomes particularly impor...

An excavator is a construction vehicle used to dig or move large objects.It is made up of two parts:a driving base and a powerful boom arm with an attachment desigined for digging.The operator sits inside a small cab attached to the base and controls the arm. The base has two sets of articulating tracks that are attached to the side of the excavator.The tracks oprater like wheel to move the unit,but provide a large surface area that creates in a more stable base for the machine.On top of the base is a plarform that rotates between 180° and 360°. The opetator sits inside the cab and has two sets and controls.One sets moves the actual unit forward and backward,and the other set moves the unit on the horizontal plan and controls the arm.These controls determine the angle and speed of the movements of the arm and bucket along the vertical axis. An excavator is designed foe use on construction sites and is quite expensive to purchase.Many smaller construction companies lease or rent these units to avoid the expensive overhead costs.The lease and rental rates vary,depending on the length of the contract,and the volume of the business with the leasing firm.The more equipment that a company leases or rents from the same firm,the better the pircing will be. All oprators are required to obtain a license for the safe operation of this machine.Failure to obtain this qualification can result in a construction site being closed by the workplace health and safety inspector until a valid certificate holder is available to operate the equipment.In addition,many insurance policies are void if the equioment is not operator. Excavators come in a wide range of sizes and capacities,and the heavier the unit,the greater the lift capacity will be.Some are small enough to fit through a standard doorway,while others are much larger.The most important factor for a person to consider when looking at smaller excavators is the amount of workgroup movement.The greater the degree of the move.

TRACK ROLLER The purpose of track roller is to transfer the weight of the chain to the ground and roll on the tracks.In order to prevent derailment,track roller  should also prevent the track from moving horizontally relative to it. Track roller often works in mud,water and sand,and bears strong impact,the working conditions are extremely bad,the rim is easy to wear. The requirements of the support wheel are:wear resistant rim,reliable bearing seal,small rolling resistance and so on. CARRIER ROLLER The functon of carrier roller is to keep the chain track in a straight line.If the carrier roller is damaged,the track chain track cannot keep the straight line. Carrier roller is a one-time injection of lubricating oil,if there is oil leakage can only be replaced,in the work should try to aviod supporting wheel long time immersion in muddy water. SPROCKET The sprocket is a transfer force,can change the speed of rotation,can change the direction of rotation. IDLER The excavator front idler is used to guide the track to turn correctly to prevent it of running of track and deviating.Most excavators also play the role of a heavy wheel. In this way,the contact area between track and ground can be increased and the specific grounding pressure can be reduced. The wheel surface of the guide wheel is made of smooth surface,and there is baffle ring in the middle as a guide,and the torus on both sides supports the rail chain. TRACK CHAIN The tightness of excavator track is is like the size of shoes worn by pepole,which must be adjuster to the best state to move forward.In the working operation of excavator. It often causes the change of crawler's tightness,and the tightness of crawler also determines the wear degree of the chain to its contact accessories. TRACK CHAIN ASSEMBLY The track chain assembly is composed of two parts:the track shoe and track chain,and the two parts are joined together by bolts and buts.

There are many forms of industrial equipment used in the workplace. Industrial equipment is usually large and made of materials such as steel and titanium for optimal strength. These machines are often needed to lift and move materials which may possibly weigh thousands of pounds. A piece of industrial equipment which is not in working order should never be used for any reason. All equipment is inspected at the beginning of everyday to ensure they are in the best condition for workers. By now, there are a million pieces of industrial equipment racing through your head but the question is, which ones are the most popular and most crucial to the industrial field? Below you will find five types of industrial equipment which are known to be the masters of all machines in the industrial workplace: Bulldozers - Bulldozers are massive machines which are used mostly in the construction and mining industries. Bulldozers have the ability to lift and move vast amounts of dirt and other debris from one place to another. Bulldozers can operate in many conditions including snow, hail and rain. These pieces of equipment are generally used to dig up the ground and provide room for building houses or other types of buildings. Cranes - Cranes are generally used to transport hard, heavy items from one place to another. The arm of the crane is used to swing the object from one place to another and the arm can be adjusted according to how far the materials need to go. Unlike bulldozers, cranes have the ability to transport objects over uneven levels of ground. Excavators - Excavators are engineering vehicles which consist of backhoes and cabs. They are mainly used in the digging of trenches, foundations and holes. They can also be used to destroy objects which are no longer needed for any reason and in which case need to be compressed and condensed. Fork Lifts - Forklifts are warehouse vehicles which are used to lift, hoist and transport extremely heavy items from one place to another. Forklifts are known to be indispensable pieces of equipment in many industrial workplaces. Compressors - Most of the pieces of equipment listed above are used for construction purposes, however compressors are generally used in more of a factory-type setting. Compressors are used to provide high pressures of air or other forms of gases. These devices can be regulated in order to maintain the desired amount of pressure in the tank. There are many other forms of industrial equipment. Each piece of equipment is designed to perform a specific task which contributes to the overall success in this field of work. Without these forms of equipment many industrial areas would not exist.

1. When the excavator goes up, the driving wheel should be in the back and the arm bar should be in the top. When the excavator goes down, the driving wheel should be in the front and the arm bar should be in the back. Slow down when downhill, no speed change on the way. 2. the excavator should not be in a hurry to turn around. If the curve is too big, it should be taken a turn. 3. When the excavator rotates, the rotary clutch is used to cooperate with the brake of the rotary mechanism to rotate smoothly, and the sharp rotation and emergency braking are forbidden. 4. excavators are strictly prohibited from carrying out maintenance, maintenance and fastening work. In case of abnormal sound, peculiar smell and excessive temperature rise, check and stop immediately. 5. the bucket must not turn or walk before leaving the ground. 6. When the crawler excavator moves, the boom should be placed in the forward direction of walking, and the bucket should not exceed 1 meter from the ground. 7.when the arm top pulley is maintained, overhauled, lubricated and replaced, the boom should fall to the ground. 8. When digging, it is not advisable to eat too deep every time, and the bucket should not be too strong, so as to avoid damage to machinery or cause overturning accidents. When the bucket falls, pay attention not to be too fast, so as not to cause the lower frame to be unstable. 9. Personnel who cooperate with excavators in bottom cleaning, leveling and slope repairing must work outside the revolving radius of excavators. If the excavator must work within the revolving radius, the excavator must stop turning and turn off the pilot switch before it can work. At the same time, the crew on board should cooperate closely to ensure safety. 10. no vehicle or pedestrians should be allowed in the range of excavator loading. If unloading to the car, should wait for the car to stop, after the driver leaves the cab, can turn the bucket, unloading to the car. When excavators are turning, they should avoid crossing the top of the cab as far as possible. When discharging, the bucket should be lowered as far as possible, but it is also important to avoid collision with any part of the vehicle.

When determing what bulldozer to buy you must first ask what you will need the machine for.Knowing the requirements for the job you will performing will be essential for determing what dozer you will need.You have three main sizes of dozers: Mini/Compact dozers-These dozers are great for residential and light construction jobs.Mini dozers are easier to transport than larger dozers,and they are made to be more functional on different terrain.Mini dozers normally weight around 20000 pounds or less.They are also really handy to use in smaller areas because machine is not very wide and can fit in tight spaces. Medium dozers-Medium dozers are best suited for jobs where the dozer is needed to be used constantly on the size because they can be used for many jobs you may have.This machine has has operating weight of about 20000-60000 pounds.You can also use this dozer on smaller job sites if it is not hard to navigate around. Large dozers-Larges dozers are needed for big and heavy use jobs.These dozers are used in landfills,quarries,or other forms of terrain that may be rough.If you site is going to be damanding and challenging then this is the best dozer for you. Hydraulics&Attachments The hydraulic system drives the machine's overall strength and responsiveness,enabling the machine to work faster throughout the work cycle.Conside the attachements you plan on working with and understand hydraulic flows required for each.Equipping your dozer with the right attachements will give you the versatility to get the most out of your investment. Transportation&Access When purchasing a new machine,transportation is always an important consideration.Depending on your dozer,a larger tralier may be needed to haul your new bulldozer. You also need to consider what trailer size is needed for transport and if you will need any additional attachements to complete the job.If you do not plan to purchase your own trailer.Can cannect you with the best carriers with the right equipment to transport your new dozer to the job size. Controls The control types of your bulldozer depend on the manufactures,but the controls are overall very similar.Each bulldozer has two joysticks,one on the right and left sides.The left stick is always for driving and the right stick is for blade control.Dozers can also have accessories with them such as a joystick to control the ripper. Tracks/Wheels and undercarriage Crawler dozer have steel tracks,but they can slao be rubber.The tracks distribute the machine's wweight on a wider range than the wheel dozers.This helps keep the machine above ground and keeps it from sinking in mud,rocks,clay or sand.The tracks will also not be damaged when they go over pieces of rubble which is something that can happen when you are using a wheeled bulldozer in tough terrain. Wheel dozers have four tires that help disperse the machine's weight to each corner where the wheels and located.These dozers offer more mobility,faster speeds and versatility becaus...

There are many reasons for the drop Chain of the excavator. n addition to the dirt or stones and other impurities in the track of ttexcavator, which will cause the excavator to go of the chain, there are also failures in the Carrier roller, sprocket, chain guard aither places that wil cause the excavator Off-chain. in addition.improper operation can also cause the excavator to disconnect. 1. The Idler roller is damaged When checking the idler, check whether the screws on the ldler of the excavator acessories are missing or broken. Is there any modifhcation to the groove of the card idler? 2. Carrier roller damage Under normal circumstances, the leakage of oil seal of the Carrier roller of the excavator will cause serious wear of the carrier roller, which will cause the track to fall off the chain. 3.Wear of sprocket For sprocket, if it is severely worn, we need to replace it. This is also an important reason for the excavator to go of the chain. 4. Wear of chain guard At present, almost all excavator parts have chain quards on the crawler tracks, and the chain quards can play a vervimportant role in preventing chain disconnection, so it is also very important to check whether the chain guards are worn. 5. Track wear If it is used for a long time, the track must be worn, and the wear of the chain ribs on the track and the chain barrel of theexcavator will also cause the track to fall off the chain. 6. Failure of the track adiuster cylinder At this time, you should check whether the track adjuster cylinder of the excavator parts has forgotten to fill with butter,and check whether the track adjuster cylinder has oil leakagase.

The first hydraulic excavator was produced way back in 1951 by a great French man called Poclain and therefore they were called by his name. The latest models include Hitachi, Caterpillar, the Komatsu and the most advanced model Leibherr. They constitute of an Arm, Engine, Swing, Cab, and the Feet. The different models of excavators which are most commonly found in the market are midi or the mini excavator, which is the most compact one, the bucket wheel model, and the loader backhoe. The construction companies use the heavy hydraulic excavators for their projects as to dig heavy rocks, to smash concrete, to cut steel, to drill holes in very hard rocky areas, etc. This machine is also used in laying roads as they are a great help to set gravel on the roads before the actual work of paving starts. The landscaping industry also makes use of this wonderful machine to mow huge areas of landscape which would take a lot of time and expense when done manually. However, for small areas people make use of the mini excavators as they are a great benefit for landscaping small areas for example, a patio or a garden at a home. When people want to build small ponds or swimming pools in the premises of their own home they make use of the mini versions. The size of the mini excavators also has made its popularity increase as they do not take much space in the traffic. They are comparatively cost effective and very flexible because of their various attachments and features. The bucket attached to it helps in both digging purpose as well as for loading things. When a grappler is attached to it, it helps to collect wood. The attachment of a mallet helps to break down objects in to very fine pieces. In conclusion, there are many benefits in using hydraulic excavators and their popularity is increasing day by day.