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We know that the quality of the slewing bearing itself is the main factor affecting the service life of the bearing, but no, because in addition to the quality of the bearing, there is also a very important issue, that is, the maintenance and maintenance of the bearing during its use, but, How to maintain the slewing bearing during use?

Lubrication of slewing bearing

1. Lubrication

(1) Reduce friction and wear. In the mutual contact parts of the rings, rolling elements and cages that constitute the bearing, metal contact is prevented, and friction and wear are reduced.

(2) Extend the fatigue life. The rolling fatigue life of the bearing is extended when the rolling contact surface is well lubricated during rotation. Conversely, if the oil viscosity is low and the lubricating oil film thickness is not good, it will be shortened.

(3) Discharge frictional heat and cooling. The oil circulation method, etc., can use oil to discharge heat generated by friction or heat from the outside, and cool it. Prevent the bearing from overheating and prevent the aging of the lubricating oil itself.

(4) Others. It also has the effect of preventing foreign matter from entering the inside of the bearing, or preventing rust and corrosion.

2. Lubrication method

Bearing lubrication methods are divided into grease lubrication and oil lubrication. In order to make the bearing function well, first of all, it is necessary to select a lubrication method suitable for the conditions of use and the purpose of use. If only lubrication is considered, the lubricity of oil lubrication is dominant. However, grease lubrication has the advantage of simplifying the structure around the bearing. Compare the advantages and disadvantages of grease lubrication and oil lubrication.

Cleaning of slewing bearing

1. Selection of cleaning materials

As the cleaning agent, cleaning agent and kerosene are generally used. In addition, pay attention to sealing the cleaning agent when not in use to avoid the entry of external magazines and contaminating the cleaning agent. In the case of inattentiveness, cleaning the bearing with the contaminated cleaning agent will not only not have a cleaning effect, but will contaminate the bearing and cause the bearing to be polluted. Running brings stress.

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Details can be accessed by clicking here:https://www.ldb-bearing.com/ldb-bearing-knowledge/how-to-maintain-the-slewing-bearing-during-use.html

The conveyor is mainly used for the transportation of materials. It has the point that the direction is changeable and the conveying direction can be flexibly changed. We commonly have screw conveyors and belt conveyors, etc. Among them, belt conveyors are the main way of conveying bulk materials. When we use or maintain the machine improperly, the conveyor may fail and cause downtime. Do you know the reason for the downtime of the conveyor?

Reasons for screw conveyor downtime

The screw conveyor has the advantages of small cross-sectional size of the whole machine, good sealing performance, multi-point loading and unloading in the middle, and easy operation and maintenance. It is suitable for conveying powdery, granular and small block materials. It is widely used in building materials, metallurgy, Chemical, electric power, coal, machinery, grain, food and other industries; it is not suitable to transport materials that are perishable, viscous, and easy to agglomerate.

The reasons for the stoppage of the screw conveyor are:

1. The material is too large

Problem: The material to be conveyed is too large, the material cannot pass through the middle hanging bearing smoothly, and the material resistance at the middle bearing is too large, causing the screw conveyor to stop suddenly.

Solution: judge the size of the material before conveying to avoid the material being too large and stuck in the middle of the hanging bearing, resulting in downtime.

2. Material blockage

Problem: Blockage of material in the screw conveyor can also cause the motor to be overloaded and shut down.
Solution: We must clean up the material in the screw conveyor, keep the conveyor unobstructed, and install a belt cleaner to avoid blockage due to excessive viscosity of the material.

3. Seal damage

Problem: The resistance at the intermediate bearing is too large and the seal is damaged. Material entering the bearing causes the bearing not to rotate or the bearing is damaged.

Solution: The seal needs to be replaced, and the abnormality at the intermediate bearing should be checked for repair.

4. Bearing burnt

Problem: The reducer bearing is burnt, resulting in downtime.

Solution: Replace the new parts to ensure the normal operation of the machine.

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Details can be accessed by clicking here:https://www.zymining.com/blog/reasons-for-conveyor-downtime.html

Forging is a processing method that uses a forging machine to apply pressure to a metal blank to plastically deform it to obtain a forging with certain mechanical properties, certain shape and size. Forging (forging and stamping) is one of the two major components. Through forging, defects such as as-cast looseness generated in the metal smelting process can be eliminated, and the microstructure can be optimized. At the same time, due to the preservation of the complete metal streamline, the mechanical properties of forgings are generally better than those of castings of the same material. For important parts with high load and severe working conditions in related machinery, forgings are mostly used in addition to rolling plates, profiles or welded parts with simple shapes.

The initial recrystallization temperature of steel is about 727 °C, but 800 °C is generally used as the dividing line, and hot forging is higher than 800 °C; between 300 and 800 °C, it is called warm forging or semi-hot forging. called cold forging.

Forgings used in most industries are hot forging. Warm and cold forging are mainly used for forging parts such as automobiles and general machinery. Warm and cold forging can effectively save materials.

PROCESS CLASSIFICATION

According to the forging temperature, it can be divided into hot forging, warm forging and cold forging.

According to the forming mechanism, forging can be divided into free forging, die forging, ring rolling and special forging.

1. FREE FORGING

It refers to the processing method of forgings that use simple universal tools or directly apply external force to the blank between the upper and lower anvils of the forging equipment to deform the blank to obtain the required geometric shape and internal quality. Forgings produced by the free forging method are called free forgings. Free forging is mainly based on the production of small batches of forgings. Forging equipment such as forging hammers and hydraulic presses are used to form and process the blanks to obtain qualified forgings. The basic processes of free forging include upsetting, drawing, punching, cutting, bending, torsion, offset and forging. Free forging is all hot forging.

Advantages: Free forging has the characteristics of flexible process, high versatility of equipment and tools, and low cost. Since free forging is formed gradually, the required deformation force is small, so it is the only way to produce large forgings (above 300T).

Disadvantages: low productivity, low precision forgings, high labor intensity, mostly used for single-piece and small batch production of forgings with simple shapes and low precision requirements.

2. DIE FORGING

Die forging is divided into open die forging and closed die forging. The metal blank is compressed and deformed in a forging die cavity with a certain shape to obtain a forging. Die forging is generally used to produce parts with small weight and large batches. Die forging can be divided into hot forging, warm forging and cold forging. Warm forging and cold forging are the future development direction of die forging, and also represent the level of forging technology.

According to the material, die forging can also be divided into ferrous metal die forging, non-ferrous metal die forging and powder product forming. As the name implies, the materials are ferrous metals such as carbon steel, non-ferrous metals such as copper and aluminum, and powder metallurgy materials. Extrusion should belong to die forging, which can be divided into heavy metal extrusion and light metal extrusion.

Closed die forging and closed upsetting are two advanced processes of die forging. Since there is no flash, the utilization rate of materials is high. It is possible to complete the finishing of complex forgings in one or several operations. Since there is no flash, the stressed area of ​​the forging is reduced and the required load is also reduced. However, it should be noted that the blank cannot be completely restricted. For this reason, the volume of the blank should be strictly controlled, the relative position of the forging die should be controlled and the forging should be measured, and efforts should be made to reduce the wear of the forging die.

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Details can be accessed by clicking here：https://www.gold-emperor.com/types-of-forging-processes/

The use of crossed roller bearings is also relatively common now. Generally, it is mostly used on mechanical equipment, and is mostly used at joints. The main reason is that crossed roller bearings can operate quickly and with high precision, which can meet the use of mechanical equipment. , so it is used more now, these are all because of the advantages of crossed roller bearings, so what are the advantages of using crossed roller bearings? In response to this problem, the manufacturer of crossed roller bearings gave us the following detailed introduction.

Specific advantages of using crossed roller bearings

1. The characteristic of the crossed roller bearing is that there are two raceways in the bearing and two rows of rollers arranged in a cross. Compared with the traditional thrust bearing + radial centering bearing combination, the crossed roller bearing is compact in structure, small in size, and simplifies the table design, thereby reducing the cost of the turntable.

2. In addition, due to the use of optimized preload, this type of bearing has high rigidity, so the rigidity and precision of the turntable are also guaranteed. Thanks to the design of two rows of crossed rollers, the effective span of the bearing can be significantly increased, so this type of bearing has a high anti-overturning moment.

In the crossed roller bearing, it is divided into two types: one is a cylindrical crossed roller bearing, and the other is a tapered crossed roller bearing.

3. In addition, crossed roller bearings are not only suitable for turntable applications with relatively low speed, but also have the advantages of high running accuracy, strong speed capability, and reduced shaft length and processing costs. Crossed roller bearings are suitable for all types of vertical or horizontal boring machines, as well as applications such as vertical grinding, vertical turning and large gear milling machines.

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For more details click to visit:https://www.prsbearings.com/a/news/advantages-of-crossed-roller-bearings.html

In the design of modern friction clutches, the structure of the tractor clutch assembly and the structure of related components should be reasonably selected according to the category of the tractor model, the use requirements, the matching requirements with the engine, the manufacturing conditions, and the standardization, generalization, and serialization requirements. It is described as follows:

The number of driven discs and the choice of dry and wet

(1)Single-plate dry friction clutch

The single-plate dry friction clutch has a simple structure, easy adjustment, compact axial size, complete separation, small rotational inertia of the follower, good heat dissipation, and smooth engagement even when an axially elastic follower disk is used. Therefore, it is widely used in micro, light and medium tractors and trucks at all levels, and is also popularized in large tractors and heavy trucks with engine torque not greater than 1000N.m. When the torque is higher, a double-plate clutch can be used.

(2) Double-plate dry friction clutch

Compared with the single-plate clutch, due to the increased friction surface, the ability to transmit torque is increased, and the engagement is also smoother and softer; in the case of transmitting the same torque, its radial size is smaller and the pedal force is smaller. However, the axial size is increased and the structure is complicated; the poor ventilation and heat dissipation of the intermediate pressure plate can easily cause overheating and accelerate the wear and tear of the friction plate, and even burn and break; the separation stroke is large, and the separation is not easy to be completely separated if it is improperly adjusted; the rotational inertia of the follower is large and easy to use Difficulty shifting gears etc. It is only used when the transmitted torque is large and the radial dimension is limited.

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For more details click to visit:https://www.syclutch.com/news/structural-type-selection-of-friction-clutch.html