Main
Parameter:
(1)Lifetime:
Under certain loads, bearing in the number
or number of hours before pitting, known as bearing life. The life of rolling
bearings in revolutions (or speed of work under a certain number of hours)
definition: bearing within this life, in any of its bearing ring or a rolling
body occurred on the initial fatigue damage (peeling or defects). However,
whether in the laboratory or in actual use, can be clearly seen, the appearance
of the same bearing under the same working conditions, the actual life is not
the same. In addition to several different definitions of bearings
"life", one of the so-called "working life", it said the
actual life of a bearing can be reached in before damage is composed of wear,
damage is usually caused not by fatigue, but by abrasion, corrosion, damage and
other reasons. In order to determine the seal bearing life standard, the
bearing life and reliability Link. Because of differences in manufacturing precision,
uniformity of material, even the same material, the same batch of bearings of
the same size, under the same working conditions, the length of life is not the
same. If the statistical life of 1 units, is the longest life expectancy of 4
units, the shortest 0.1-0.2 units, the longest and the shortest life is 20-40
times of.90% bearing does not produce the number of revolutions of pitting, or
hour experience called rated life bearing.
(2)Dynamic load rating:
For the bearing capacity comparison of bearing
anti pitting, provisions of the rated life of a bearing one million , the
maximum load can withstand the basic dynamic load rating, C said. It is bearing
on the dynamic load rating of C under the action of the bearing one million
without the occurrence of pitting failure reliability for 90% C, the greater
the carrying capacity is higher. The basic rated dynamic load bearing 1. refers
to the pure radial load 2. thrust ball bearing is 3. pure axial load radial
thrust bearing is to produce pure radial displacement and radial component.
Category:
(1)Sleeve bearing:
Plain bearings, both inside and outside the
ring, there is no rolling body, usually made of wear-resistant materials, often
used in low speed, light load and filling lubricating oil and maintenance
difficult mechanical rotating parts.
(2) Spherical plain bearing
The sliding contact surface of the joint
bearing is spherical, which is mainly suitable for swinging motion, tilting
movement and rotary motion.
(3) Antifriction bearing
Rolling bearing according to different load
direction which can withstand or nominal contact angle for radial bearing and
thrust bearing. The radial contact bearing for the nominal contact angle of 0
radial bearings, angular contact radial bearing for the nominal contact angle
greater than 0 to 45. The radial bearing axial contact bearing for the nominal
contact angle for thrust bearing 90, angular contact thrust bearing for the
nominal contact angle is greater than 45 but less than 90 of the thrust
bearing.
(4) Deep groove ball bearing
Deep groove ball bearings are the most
representative. Compared to other types of bearings with the same size, this
kind of bearing friction coefficient is small, extreme high speed, simple
structure, low manufacturing cost, high precision, without frequent
maintenance, and large size range, form, bearing is a kind of the most widely
used. It mainly bear radial load, also can withstand the axial load. When the
only bear radial load, the contact angle is zero.
(5) Self-aligning ball bearing
Self-aligning ball bearing is two groove of
the inner ring and outer ring raceways between spherical and spherical ball
bearing assembly. Outer ring raceway curvature center and bearing center line,
so it has the same self-aligning ball bearing self-aligning function. In the
axial deflection shell, can be automatically adjusted that is not to increase
the burden bearing. The axial load of spherical roller bearings can bear radial
load and two directions. Self-aligning ball bearing radial load capacity, suitable
for heavy load, load impact. Inner diameter is tapered bore bearings can be
installed directly. Or use the sleeve, remove the tube installed in the
cylinder axis cage. Stamping steel cage, polyamide forming. Self-aligning ball
bearing is designed to withstand heavy load and impact load, precision
instruments, low noise motor, automobile, motorcycle, metallurgy, rolling mill,
mine, petroleum, paper, cement, sugar etc. Industry and general machinery, etc.
(6) Linear bearing
Linear bearing is divided into linear
bearing and linear bearing metal plastic. Metal linear bearing is a kind of
linear motion system with low cost of production, for unlimited travel and with
the use of cylindrical shaft. Because the ball bearing in point contact with
the shaft, so the load is small. The ball rotation to low friction resistance,
smooth movement so as to obtain high precision.
Bearing Parts,Spherical Bearing,Industrial Bearing,Stainless Steel Bearing Parts VESTA Motoring Ltd , https://www.vesta-industry.com
The contents of the questionnaire include: the number of households, the annual water consumption, the average monthly water consumption, and the first step water that the masses think is appropriate is equal to the survey questions related to the pricing content. At the same time, with the promotion of water price knowledge: why the implementation of the ladder water price, how to determine the level of water, the composition of the city's comprehensive water prices.
This activity adopts the method of household survey, 200 questionnaires are distributed and 200 valid questionnaires are withdrawn. The staff communicated with users face-to-face, filled out questionnaires and answered questions raised by the people.
By carrying out this activity, both the pricing procedures and the water consumption of most of the people have been improved, and primary data have been obtained for the rational development of step water volume. At the same time, the event publicized the related policies of the ladder water price, effectively solved the people's doubt that the price adjustment was a price increase, and resolved the contradictions in the early stage of price adjustment and received good social effects.
(Original title: Shandong Wucheng: ladder water price questionnaire households resolve the price increase in advance)
Wucheng, Shandong Province, take measures to do a good job of stepping water prices
[China Instrument Network Instrument Industry] In order to successfully complete the adjustment of the ladder water price in Wucheng County, Shandong Province, and formulate a reasonable amount of step water, the Wucheng County Price Bureau carried out a questionnaire survey on urban residents' water consumption.