Month: June 2012

Mechanisms

Wheels odnorebordnye: Mechanisms of movement are called nodes, providing, as a rule, the horizontal movement of lifting machine (crane) or part (truck). The mechanisms of movement with the rails include bridge, gantry, cantilever, gantry, tower and railway cranes, bridge cranes. For track use the mechanisms of movement of crane wheels (drive, idle). All items mechanism of movement placed on the moving frame lifting machine (crane), or truck. Mechanisms of movement of crane wheels, in turn, move along double-girder paths. The mechanism of movement is composed of motor, gear drive transmission system and chassis (Crane wheels with bush and the shaft (drive, blank) Crane wheel undercarriage mechanism of movement of the crane is one of the main parts crane machines, in addition, has the property quickly deteriorate under heavy usage. There are different types of wheels such as wheel and dvuhrebordnoe odnorebordnoe.

Crane wheels are manufactured according to gost 28648-90 Billet crane wheels are manufactured so-called method of stamping or forging. In the manufacture of the mechanism of movement of steel is used categories 65G gost 14959-79. After machining Crane alloy heat-treated (sorbitizing). Crane wheel should have a hardness of track riding from 300 to 390NV. The depth of the hardened layer up to 30 mm depending on the diameter of the wheel. Sorbitizing necessary to achieve smooth transition from the hardened metal to non-hardened metal. Heat treatment process takes place in spreyernoy setup with constant control parameters (temperature and water pressure, cooling rate).

At the moment sorbitizing crane wheels is the best method of treatment has some significant advantages compared to bulk quenching and tempering T. C., such as high durability, cushioned hub, hardening depth of 30 mm. Wheels odnorebordnye: Mechanisms of movement are called nodes, providing, as a rule, the horizontal movement of lifting machine (crane) or part (truck). The mechanisms of movement having the track include bridge, gantry, cantilever, gantry, tower and rail cranes, overhead cranes. For track use the mechanisms of movement of crane wheels (drivers, idle). All elements of the mechanism of movement placed on the moving frame lifting machine (crane), or truck. Mechanisms of movement of crane wheels, in turn, move along double-girder paths. Mechanism movement consists of an electric motor, gear drive systems, transmissions and chassis (Crane wheels with bush and the shaft (drive, blank) Crane wheel undercarriage mechanism of movement of the crane is one of the main parts of crane machines, in addition, has the property deteriorate rapidly, with heavy usage. There are different types of wheels such as wheel and dvuhrebordnoe odnorebordnoe. Crane wheel manufactured according to gost 28648-90 Blanks crane wheels are manufactured so-called method of stamping or forging. In the manufacture of the mechanism of transport shall be steel categories 65G gost 14959-79. After mechanical handling crane wheels were heat-treated (sorbitizing). Crane wheel should have a hardness of track riding from 300 to 390NV. The depth of the hardened layer up to 30 mm depending on the diameter of the wheel. Sorbitizing needed for a smooth transition from the hardened metal to non-hardened. Heat treatment process takes place in spreyernoy setup with close control of parameters (temperature and water pressure, cooling rate). At the moment sorbitizing crane wheels is the most optimal method of treatment which has some great advantages in comparison with the bulk quenching and tempering T. C., such as high durability, cushioned hub, depth quenching to 30 mm.

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Number

Number – an abstract entity used to describe the amount. Sequence. There are different kinds of numbers. Natural numbers 1,2, used for counting objects. Set of natural numbers is denoted. If the natural numbers to add negative numbers and zero, we obtain integers.

Whole numbers in mathematics are studied within the framework of the theory of numbers. Relationships of integers are called rational numbers, or ordinary fractions. The set of all rational numbers is denoted. If by rational numbers add all the endless and non-recurring decimals are called irrational numbers, we get real numbers. Except unit on rational and irrational, real numbers are also classified into algebraic and transcendental. At the same time every transcendental number is irrational, every rational number – algebraic. Real numbers, in turn, can be extended to complex numbers. Complex numbers can be extended to quaternions, but multiplication of quaternions is noncommutative.

In turn, the octave are extensions of quaternions, are already losing the property of associativity. In mathematics, for the sets there is a set amount of power, a similar number of elements in it. The development of this submission for infinite sets led to a further generalization of the concept of number. Now talking about cardinal numbers, which describe the set of any number of elements – finite or infinite.

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Gift Choosing

In anticipation of any important dates, including International Women's Day, in the minds of people start flickering eternal question: 'what to give? " In our case, even this: 'what to give your favorite woman on March 8? " And once followed by a question in the mind emerges hackneyed phrase that is important is not a gift, and attention. Gross error of many is that they understand this phrase as follows: no matter what to give – if only to show attention. But in fact, a gift must have utility for the owner, even if the utility is simply the pleasure of seeing things. Besides being useful, the gift must have a few more properties. First, it must be socially approved, that a woman could, for example, boasts in front of them friends or colleagues. This property is inherent to any jewelry and expensive gifts, which are both or otherwise demonstrated to the public and highlight the status of the owner.

Second, the gift must show the woman that she is loved and desired. For this reason, best not to give a set of saucepans, a set of lacy bottom clothes or expensive perfume. Third, the gift should be expected. Yes, yes, women like 'predictable surprises' and before the holidays begin, as a rule, actively hint as to what gift they want – a man remains only to hear these insinuations. In addition, the gift should not be drastically different in price range from that which was presented last year. After all, if the past 8 March were given slippers, and this – necklace with diamonds, then a woman can smell a rat (even if there is no real reason). Finally it is worth adding that the gift should always be accompanied by a ceremonial greeting, because women love beautiful words in the address, and here is just better to show some originality and not repeat the same words every year. And do not forget the flowers! This article belongs to this site: beautiful declarations of love I love you SayMeLove

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Wood Content

One of the properties of wood is its ability to modify its own moisture. This property is called hygroscopicity. Humidity varies depending on the environment – if the wood is wet, then dry air, it emits moisture, if the air is humid and dry wood, it takes moisture. Thanks colloidal substances in the wood cells percentage of bound moisture in her could not be more specific maximum (30%), which depends on temperature and wood species. If the total moisture content greater than this maximum, then the timber is also free water, whose volume is calculated from the ratio between the walls cells and their cavities (from 50-60 to 200-250% depending on the breed). There are so-called stable moisture content.

Her material gets, if present in the air with a steady state (temperature, humidity, etc. characteristics) in two ways – sorption and desorption. If the air condition will change, the moisture content of wood will either increase or decrease. Sorption – the absorption of moisture from the air timber. Desorption – drying and, consequently, the release of moisture in the environment. When measuring the moisture content of wood is used as an indicator of sorption hysteresis. It is derived from the difference between a stable moisture content for desorption and sorption. The value of this index is largely dependent on the sample size – about 2.5% moisture content for samples more 15h100 (ShhD).

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