Optiuni cautare

Bearing classification and routine inspections
First, the importance of bearing in machinery and equipment

miniature linear slide in "low-speed heavy-duty" during operation, by the rotation of the motor into mechanical energy and power WQZ self-lubricating bearings to change the direction of movement, its length of life of MPBZ Oil Free Bushing improve equipment operation rate, productivity play a key member effect, so in the production of which, usually to enhance regular tour inspection equipment bearings, fuel, oil changes, maintenance work is extremely important.

Second, the classification of bearing

SOB SOBU bronze straight tyoe guide bush can be divided into two categories, namely, plain bearings and rolling bearings. Bearing in two forms: first, fixed, and bearing bush integrally cast, the first oil-free bush LFB two kinds of split, bush and bearing split. This form of easy maintenance. Rolling is divided into four types:

①, thrust bearing, bearing axial load;

②, angular contact bearings, and bearing radial axial load;

③, radial bearings, bearing radial load;

④, general bearing. Bearing wide use different equipment performance, load, and other characteristics of the technical requirements, the use of different types of bearing arrangements.

In accordance with relevant specification bearings, sliding bearings in the operation of the maximum temperature of not more than 60 ℃, the highest temperature of the rolling bearing in operation no more than 70 ℃ principles. Maximum oil temperature does not exceed 60 ℃, otherwise easily lead to bearing damage and breakage.

Third, damage and failure of the bearing is formed

Damage and failure of the bearing is formed mainly severe oil loss, fatigue damage, dirt and protect the damaged aircraft caused permanent deformation.

Daily tour and inspection work:

① see - the height of the oil level, check the fuel records the amount of time, oil, grease and add the oil bearing each device model specification is correct.

② listen - listen using the needle tool in the operation of the equipment if there Jamming phenomenon, without noise, running smoothly.

③ touch - available thermometer temperature measurement can also touch the bearing housing temperature, whether in a controlled range of values ??within the required specification.

Fourth, the examination method for a bearing to prevent damage

Our daily inspection work, the use of hearing, touch, see screening method, bearing understand the principles used in the production and maintenance during operation of maintenance knowledge. Bearing is mainly applied on high speed, low speed heavy duty equipment, such as: turbine generator, rotary kiln roller set, coal mill, cement mill, large motors, it is the nature of sliding friction, so the lubrication of these devices way with thin oil station cooling water way, oil circulation between the sintered gear, powder sintered parts and the bearing to produce an isolation film that lubricates, while reducing the frictional heat generated by the pad.

What are sliding bearing classification!
1. The fluid lubricated bearing completely
Commonly used form of grease, oil line and metric bronze sleeve bearings, diameter of axle and bearing surface does not have enough lubricant, liquid film of discontinuity.Simple structure, friction factor is bigger, wear and tear.
(1) the radial sliding bearing
A. integral
Clearance between shaft and bush cannot adjust, simple structure, journal can only put down from the shaft end.Generally used in low speed, light load and allow the installation of the machine.
B. split
Between shaft and Conveyor Bearing with Punched bearing clearance can be adjusted, installation is simple.When the machine have some difficulties in installation, often in this way.
C. the motion of the bearings can be appropriate in the bearing seat, to adapt to the shaft when bending deflection.Used for the shaft deflection of occasions, including joint bearing is suitable for each other have a swing bar junction bear radial load.
(2) the thrust bearing
Commonly used plane thrust bearing, due to a lack of liquid friction conditions, and in the incomplete fluid lubrication state, should be used in conjunction with the centripetal bearing.For special occasions under axial force.
(3) powder metallurgy bearing (oil bearing)
With porosity, oil in the pore, in a long time can not add lubricating oil and automatic lubrication, guarantee the normal work, but because its material is soft, so the load bearing capacity is low.Used for light load, low speed and not easy to come on.
(4) plastic bearings
Compared with metal bearings, plastic bearings light weight, easy maintenance.Good chemical stability, high wear resistance and fatigue strength, and with damping, sound absorption, self-lubrication, insulation and self-extinguishing.But the thermal expansion coefficient, low thermal conductivity, hygroscopicity, strength and dimensional stability than metal.Used in the speed is not high and cooling place with good sex, working temperature should not exceed 65 ℃, the instantaneous working temperature does not exceed 80 ℃.
(5) rubber bearing
Can absorb vibration and impact, in a environment with impurity wear-resisting, good corrosion resistance, but its unit strength is relatively low metal heat resistance is poor, not suitable for high temperature and contact with oil or organic solvent phase environment.Used in bearing of ship shaft tube must be vibration and corrosive environment.
(6) wood bearing
Powder sintered parts-PM wrench light and cheap, can absorb shock, the shaft deflection sensitivity to small, but strength is low, heat conductivity and wet resistance, abrasion resistance is poor.Used for light load vibration conditions, such as agricultural machinery disc harrow bearings, large ore pump bearings, etc.

Introduction Principles and use copper worm Features
metal bush is the angle between the tangent and the end face of the worm Worm Indexing circular helix, the relationship between the screw and the helix angle, helix angle worm then transfer large high-efficiency copper nut move. The following describes the principle and the use of copper worm characteristics:

SOBBD bronze split type bush principle and use: copper worm drive principle: copper copper turbine worm drive for two axes intersecting at 90 degrees, but when neither parallel nor intersecting each other, usually in the worm gear, the worm is an active member while the worm wheel is driven member.

Copper worm reducer is a compact structure, transmission ratio, under certain conditions, wear self-locking blocks transmission machinery. Wherein the hollow shaft worm gear reducer not only with the above characteristics, and ease of installation, reasonable structure, more and more widely used. It is the worm reducer input to install a helical gear reducer, consisting of multi-stage gear available to very low output speeds than single-stage worm reducer has a higher efficiency and little vibration, noise and energy consumption is low. Elevator gearbox host matches for the steel copper copper worm reducer, it is not an ordinary gear oils can not be used, but only with a worm for oil, copper turbine does not corrode.

Many gear oil containing a sulfur additive, under boundary lubrication conditions, this can happen with the additive metal element of the gear surface to prevent serious chemical reaction sintering two friction surfaces. But under boundary lubrication to prevent metal to metal contact at the same time, sulfur additive corrosive under certain conditions, especially for the yellow metal, such as copper, brass, bronze, etc. These commonly used in industrial worm and other components metallic material terms. The best way to choose the right product is to type, material and operating conditions, the gear has a comprehensive understanding. According to the load device, running speed, operating temperature and other requirements to select the correct lubricant.

JDB solid bronze bushing gear has the following characteristics:

1. 2. The transmission power range work smoothly without noise 3. Compact and get great transmission ratio, the transmission ratio is generally 7-80.4 low transmission efficiency, worm often need non-ferrous metal manufacturing. A single worm screw head and long points. Calculate the transmission ratio is as follows: I = n1 / n2 = z / K n1- speed n2- worm worm worm speed K- first few Z- worm of teeth.

When using the composite bearing should pay attention to what place
manufacturing in china are precision parts, so it was use for quite cautious.Even the use of high performance bearing, if use undeserved, can't reach the expected effect of performance, and easy to make the bearing damage.So, when using the bearing should be paid attention to, the following:

adhere to the bronze wear oval washer and its surroundings clean, even invisible to the naked eye of dust into the bearing, also will increase the wear of bearings, vibration and noise.
2, should be careful when using the device, are not allowed to powerful punch, are not allowed to use hammer percussion bearing directly, not allow through transfer roller pressure.
Third, using appropriate, accurate installation tools, as far as possible use of special tools, trying to prevent the use of cloth and short fiber, things like that.
Four, avoid bearing corrosion, directly with the hand take bearing, plenty to wash hands sweat and coated with high quality mineral oils suspended again after the operation, especially in the rainy season and summer to pay more attention to rust.However, in some special operating conditions, can make more good at traditional computing bearing life, especially under the condition of light load.The operating conditions of these special is, when the rolling surface (orbit and rolling piece) can be separated by a smooth film effectively and limiting pollutants can cause the appearance of damaged.In fact, under ideal conditions, the so-called for bearing life is possible.
Five, the service life of bearing, the life of rolling bearing with revolution (or in the hours of work under a certain speed), the definition: within the life of the bearing, should be in any of its bearing ring or rolling body attack on initial fatigue damage (spalling or defect).But in theory or in the laboratory experiment, can be clearly seen, under the same working conditions, the appearance of the same bearing theory is very different life.In addition there are several different definitions of bearing "life", one of which is known as the "service life", it represents a certain bearing before damage can arrived in the theory of life is made up of DX-H sleeve bushing and tear, damage caused by usually is not tired, but by abrasion, corrosion, the reason such as sealing damage forms.