What about Liangli
Calculation of spring weight (kg):
wire diameter × Wire diameter × Total number of spring turns × Pitch diameter of spring × one point nine three seven ÷ 100000
elastic formula
F = KX, f is elastic force, K is stiffness coefficient (or obstinacy coefficient), and X is the length of spring lengthening (or shortening). Example 1: when a spring with a stiffness coefficient of 100N / M is pulled by 5N force, the spring will be lengthened by 5cm. Example 2: when a spring is pulled by 10N force, the total length is 7cm, and when it is pulled by 20n force, the total length is 9cm
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extended data:
structure classification
< P > according to the mechanical properties, springs can be divided into tension spring, compression spring, torsion spring and bending spring, according to the shape, they can be divided into disc spring, ring spring, plate spring, spiral spring, truncated cone scroll spring and torsion bar spring, According to the manufacturing process can be divided into cold coil spring and hot coil spring. Ordinary cylindrical spring is widely used because of its simple manufacture, various types and simple structure Generally speaking, the manufacturing materials of spring should have high elastic limit, fatigue limit, impact toughness and good heat treatment performance, and the commonly used ones are carbon spring steel, alloy spring steel, stainless spring steel, copper alloy, nickel alloy and rubber. The manufacturing methods of spring include cold rolling and hot rolling. The diameter of spring wire less than 8 mm is generally cold rolled, and the diameter greater than 8 mm is hot rolled. Some springs need to be pressed or shot peened after being made, which can improve the bearing capacity of the springYield is also known as the qualified rate, the qualified rate formula: the number of qualified procts ÷ Total number of procts × 100%
because every process in the proction line may proce defects, some defects can be repaired by rework to become qualified, so the final pass rate can not reflect the loss caused by the rework of the intermediate process. Therefore, the concept of circulation qualified rate is put forward
after a batch of procts are proced, after standard testing, the percentage of qualified procts detected in the total number of procts is called the proct qualification rate
extended data:
in 2007, nearly 200 kinds of procts in 12 categories, including food, consumer goods, building materials, mechanical and electrical procts, instrial and agricultural means of proction, were selected in our city. After authoritative testing, 9222 batches were qualified, with an average qualified rate of 87.3%, 3.4 percentage points higher than the average qualified rate of national supervision and random inspection
compared with the supervision and spot check of energy-saving and resource-saving procts in 2006, a total of 1218 batches of automotive ethanol gasoline, light diesel, liquefied petroleum gas, plumbing accessories, new building materials, energy-saving electrical appliances and other procts were spot checked, with a qualified rate of 1097 batches and a sampling qualified rate of 90.1%. The spot check results show that all kinds of energy-saving, water-saving, environmental protection and consumption recing procts in our city have developed rapidly and the quality is relatively stable, which has effectively promoted the construction of two oriented society in our city
source of reference: Network - proct qualification rate
Hello, {Liangli} is a rare word. It can't be displayed on the web page. It can only be displayed in the form of pictures. See below:
Pressure = pressure * force area (F = PS)
The international unit of pressure is "Newton", abbreviated as "cow", and the symbol "n"; Traditionally, in mechanics and most engineering disciplines, the word "pressure" is synonymous with pressure in physics The pressure on the solid surface is usually the result of elastic deformation and belongs to contact force. The pressure on the surface of liquids and gases is usually the result of gravity and molecular motion. The direction of pressure is usually perpendicular to the contact surface of the object. If the direction of action of pressure is not perpendicular to the contact surface, it is usually e to the interaction of pressure and friction
extended data
the difference between pressure and pressure:
I. different definitions:
1. Pressure refers to the force acting vertically on the surface of an object
Pressure refers to the pressure on the unit area of the object Second, the cause of formation is different:1. Pressure is formed by mutual extrusion between objects
The pressure is not only related to the pressure, but also related to the stress area. The larger the pressure is, the smaller the stress area is and the greater the pressure istake the second decimal place of the percentage and the result is 70%. I round it up. You can see the specific requirements when you want it
1. F = g (pressure and gravity balance)
2, f = f '(pressure and external force balance)
3, f = P * s (pressure = pressure * force area)
4, f = P * g * h * s (this is the pressure of liquid on the bottom of the container, Pressure = liquid density * g * liquid depth * stressed area)
extended data:
features:
1. The action direction is perpendicular to the action area and opposite to the outer normal direction of the action area
When the pressure is constant, the smaller the stress area is, the more significant the effect of pressure is When the stress area is fixed, the greater the pressure is, the more significant the effect of pressure is pressure and gravity:
(1) pressure is caused by the mutual extrusion and deformation of two objects in contact with each other; Gravity is proced by the attraction of the earth to objects near the ground
(2) the direction of pressure has no fixed direction, but it is always perpendicular to the contact surface of the stressed object Because the contact surface may be horizontal, or vertical or inclined) gravity has a fixed direction, always vertically downward (3) pressure can be generated by gravity or independent of gravity. When the object is placed on a horizontal plane and there is no other external force, the pressure is equal to the gravity. When an object is placed on an inclined plane, the pressure is less than gravity. When an object is pressed on a vertical plane, the pressure has nothing to do with gravity. When an object is lifted and pressed against the ceiling, gravity weakens the effect of pressure (4) the action point of pressure is on the surface of the body, the action point of gravity is on the center of gravity, and the center of gravity of regular uniform geometry is on the geometric center of the body There is a close relationship between the strength of the external force and the climatic factors, because the hydrological, vegetation and other factors that affect the development of the terrain are controlled by the climatic conditions. For example, in cold glacier covered areas, freezing thawing disintegration and glaciation are dominant; in arid areas, water flow is not significant, while wind sand is dominant; in warm and humid areas, water flow is the most active In this sense, not only the weathering crust and resial materials have obvious zonal characteristics, but also the development of topography, which has always been considered as a non zonal factor, reflects the brand of climate to a certain extent In particular, climate can affect the terrain through vegetation and Hydrology: in areas with dense vegetation and good soil and water conservation, vegetation can inhibit the development of external erosion, so as to protect the ground; However, in areas with sparse vegetation and even bare ground, the erosion intensity of water, wind and other external forces is strengthenedthe ratio of the pressure on an object to the area under force is called pressure. Pressure is used to compare the effect of pressure. The greater the pressure is, the more obvious the effect of pressure is. The calculation formula of pressure is: P = f / s, the unit of pressure is Pascal, and the symbol is PA
There are two ways to increase the pressure: increasing the pressure when the stress area is constant or decreasing the stress area when the pressure is constant. The methods to rece the pressure are as follows: to rece the pressure when the stress area is constant or to increase the stress area when the pressure is constantthe liquid has pressure on the side wall and bottom of the container, and the pressure increases with the increase of liquid depth
The characteristics of the internal pressure of liquid are as follows: the liquid has pressure from the inside to all directions; The pressure increases with the depth; At the same depth, the pressure of liquid in all directions is equal; The pressure of liquid is also related to the density of liquid. The higher the density of liquid is, the higher the pressure is. The internal pressure of liquid can be measured by manometerwhen an object is deformed e to external or internal factors, there is an interaction force between the two sides of any section in it, which is called stress
Generally speaking, compressive (or tensile) deformation and shear deformation will occur in solids under the action of external forces. Therefore, to describe these deformations of a solid exactly, we must know the effect of the three components of the force acting on its three mutually perpendicular planes In this way, the stress f / A has nine different components corresponding to each component force FX, FY and FZ acting on three mutually perpendicular planes ax, ay and AZ, so strictly speaking, the stress is a tensorThe sampling system uses instruments to analyze the data, and then transmits the data to the central station of the monitoring center in the form of electrical signals, and the data is transmitted to the public through the central station
air index, according to the proportion of various components in the air, simplifies the monitored air concentration into a single conceptual index value form, which classifies the air pollution degree and air quality status, and is suitable for representing the short-term air quality status and change trend of the city
the value range of air pollution index is set as 0-500, among which 0-50, 51-100, 101-200, 201-300 and more than 300 correspond to the limit values of pollutant concentration of class I, class II, class III, class IV and class V of national air quality standard
In practical application, grade III and IV are divided into grade III (1), grade III (2), grade IV (1) and grade IV (2)I, the air quality assessment was excellent, and had no impact on human health; Grade II, air quality assessment is good, no significant impact on human health; Grade III, mild pollution, irritation symptoms in healthy people; Grade IV, moderate pollution, irritation symptoms were common in healthy people; Grade V, serious pollution, severe irritation symptoms in healthy people
when the air pollution index reaches light pollution (i.e. between 100 and 200), healthy people may have irritation symptoms. Patients with heart and respiratory diseases should rece physical consumption and outdoor activities; When the air pollution index reaches 200-300, symptoms are common in healthy people. The elderly and patients with heart and lung diseases should stay indoors and rece physical activity
When the air pollution index is above 300, healthy people should avoid outdoor activitiesit classifies the degree of air pollution and air quality status, and is suitable for expressing the short-term air quality status and change trend of cities
the air quality sub index is also specified for indivial pollutants. The main pollutants involved in air quality assessment are fine particulate matter, inhalable particulate matter, sulfur dioxide, nitrogen dioxide, ozone and carbon monoxide
the number of eight character five elements (including resial Qi): 3 gold, 2 wood, 5 water and 1 fire, Four soil
eight character five elements score:
water: 50 gold: 20 similar score: 70
wood: 8 fire: 4 soil: 27 different score: 39
difference: 31 comprehensive prosperity and decline score: 31 eight character excessive prosperity
Renshui born in the month of Hai (ep-g): if a comes out to make e, it must be saved by Gengxin
if you have e but not C, you can gather wealth. When you hit Wugeng, you can reach a high position, that is to say, you will be able to kill the seal and change the grid. You can see Rongda in Fengjia wood
the four pillars need to be filled with "fire" and "Earth" the day after tomorrow