What should we do if the slewing ring is rusted? Ways to prevent rust of slewing bearings

Turntable bearings are important parts in many modern machinery and equipment, because their performance is more unique than other mechanical parts, including significant advantages in anti-corrosion performance. However, if the slewing bearing is not produced strictly in accordance with the cleaning and anti-rust regulations and the requirements of oil seal anti-rust packaging, the bearing parts in the processing process and the finished bearing products after assembly shall be treated with rust; or the anti-rust used in production The quality of rust lubricating oil, cleaning kerosene and other products cannot meet the requirements of the process technology, and the use of inferior anti-rust lubricating oil will cause the bearing to rust. So what can be done to prevent it from rusting? Today, the editor will share with you several ways to prevent the rust of the slewing bearing.

One, surface cleaning method

Cleaning must be based on the nature of the surface of the rust-prevented material and the prevailing conditions, and an appropriate method must be selected. Generally, there are solvent cleaning method, chemical treatment cleaning method and mechanical cleaning method. When the surface is dry and clean, it can be dried with filtered dry compressed air, or dried with a dryer at 120~170℃, or dried with clean gauze.

2. Method of applying anti-rust oil

1, brushing method

This method is suitable for slewing bearings or special-shaped bearings that are not suitable for immersion or spraying. When brushing, it is necessary to pay attention not to accumulate rust-preventing oil, and of course to prevent leakage.
Slewing ring
2, spray method

Some large slewing bearings can not be oiled by immersion method, generally use about 0.7Mpa pressure filtered compressed air to spray in clean air. The spray method is suitable for solvent-diluted anti-rust oil or thin-layer anti-rust oil, but complete fire protection and labor protection measures must be adopted. This method is mostly used for rust prevention of some large slewing bearings.

3, soaking method

The slewing bearing is soaked in anti-rust grease, a thick layer of anti-rust grease can be adhered to its surface. The thickness of the oil film can be achieved by controlling the temperature or viscosity of the anti-rust grease, and this layer of grease can effectively isolate it from The contact of air achieves the effect of rust prevention.

The above are several ways to prevent rusty slewing bearings. I hope everyone can help after reading them. In addition, when we use the bearing, do not directly touch the bearing with your hands, because when sweat contacts the bearing, a layer of sweat film will be formed on the bearing surface. The sweat film will cause electrochemical effects on the bearing and corrode the bearing. Therefore, use special tools such as special gloves or finger cots to pick up the bearing, and do not touch it directly with your hands.

What should we do if the slewing ring is rusted? The ways to prevent rust of slewing bearings

Slewing bearings are important parts in many modern machinery and equipment, because their performance is more unique than other mechanical parts, including significant advantages in anti-corrosion performance. However, if the slewing bearing is not produced strictly in accordance with the cleaning and anti-rust regulations and the requirements of oil seal anti-rust packaging, the bearing parts in the processing process and the finished bearing products after assembly shall be treated with anti-rust; or the anti-rust used in production The quality of rust lubricating oil, cleaning kerosene and other products cannot meet the requirements of the process technology, and the use of inferior anti-rust lubricating oil will cause the bearing to rust. So what can be done to prevent it from rusting? Today, the editor will share with you several ways to prevent the rust of turntable bearings.

One. Surface cleaning method

Cleaning must be based on the nature of the surface of the anti-rust material and the prevailing conditions, and an appropriate method must be selected. Generally, there are solvent cleaning method, chemical treatment cleaning method and mechanical cleaning method. When the surface is dry and cleaned, it can be dried with filtered dry compressed air, or dried with a dryer at 120~170℃, or dried with clean gauze.

Second, the method of coating anti-rust oil

1. Brushing method

This method is suitable for slewing bearings or special-shaped bearings that are not suitable for immersion or spraying. When brushing, it is necessary to pay attention not to produce anti-rust oil accumulation, and of course to prevent leakage.
Slewing ring

2, spray method

Some large slewing bearings cannot be oiled by immersion method, generally use about 0.7Mpa pressure filtered compressed air to spray in clean air. The spray method is suitable for solvent-diluted anti-rust oil or thin-layer anti-rust oil, but complete fire protection and labor protection measures must be adopted. This method is mostly used for rust prevention of some large slewing bearings.

3, soaking method

The slewing bearing is soaked in anti-rust grease, and a thick layer of anti-rust grease can be adhered to its surface. The thickness of the oil film can be achieved by controlling the temperature or viscosity of the anti-rust grease, and this layer of grease can effectively isolate it from The contact of air achieves the effect of rust prevention.

The above are several ways to prevent rusty slewing bearings. I hope everyone can help after reading them. In addition, when we use the bearing, do not directly touch the bearing with your hands, because when sweat contacts the bearing, a layer of sweat film will be formed on the bearing surface. The sweat film will cause electrochemical effects on the bearing and corrode the bearing. Therefore, use special tools such as special gloves or finger cots to pick up the bearing, and do not touch it directly with your hands.

A few tips for the oil leakage of excavator slewing bearings

Slewing bearings are widely used in excavators. Recently, many friends have come to inquire about the oil leakage of excavator slewing bearings. Today, the editor will talk about how to deal with it, and share the experience of repairing and handling.

 

When the excavator is in use, lubricating oil often leaks out of the bearings, and the leaked oil and butter mix together and it is difficult to distinguish the type! How can I tell which oil is leaking out?

 

The first step is to check whether the gear oil level of the rotary gear box is lower limit or high tide. If the gear oil level drops or there is basically no oil level, it can be directly determined that the grinding disc oil seal under the rotary gear box is damaged.

 

Remedy: Check whether the reduction gear box gear is damaged. If the reduction gear is normal, check whether the clearance between the upper and lower bearings of the rotary vertical shaft or the bearing seat is too large. If there is any problem, replace the bearing or repair the bearing seat shell! Check whether the contact surface between the oil seal and the vertical shaft is severely worn. If necessary, cut the oil seal lip spring appropriately to increase the tightness of the oil seal or change the position of the oil seal lip!

 

If the oil level in the rotary tooth box increases significantly, it can basically be concluded that the oil seal of the rotary motor skeleton is damaged, because the hydraulic oil in the motor is connected to the tooth box through the pressure to the lower tooth box. The pressure in the tooth box is too high to damage the oil seal of the grinding disc, so the motor skeleton must be replaced at the same time And the grinding disc oil seal! When disassembling the motor, carefully check whether the bearing of the upper cover of the motor shaft is too large, which causes the centrifugal rotation of the motor shaft to rotate and damage the oil seal!

 

If the oil level in the rotary tooth box is normal, then the oil seal of the rotary center joint is damaged! The most obvious symptom is insufficient power to walk on one or both sides!

 

Remedy: Replace the oil seal inside, and check whether the contact surface of the first oil seal on the shaft is worn! If the abrasion is severe, it must be repaired. If it is not repaired, it will be futile even if the oil seal is replaced. Because the cost of replacing the shaft is too high, it is usually repaired, and it can be used normally after the sleeve or repair welding and then polishing.

 

If the above three causes are eliminated, there is another possibility that the sealing ring of the main support bearing of the slewing ring is damaged! The only thing that leaked out was the butter, because the viscosity of the butter was relatively high and it was easy to distinguish it.

 

Some friends think that you don’t like to miss some butter, so they don’t pay much attention to it! But here to tell everyone that this oil seal not only plays a role in sealing oil, but also plays a role in dust prevention! Because most of the working environment of the excavator is in the sand and rock field, it is inevitable that debris will be mixed into the bearing to cause early wear of the slewing bearing, which directly affects the service life of the turntable! Although it is troublesome to replace, it is recommended to replace it in time for your car.

Application of slewing bearing in CNC vertical lathe

In the vertical turning equipment, the rotary table is one of the core structures that reflects the overall performance of the machine tool and realizes the machining accuracy of the workpiece. We require it to operate at high speed and bear heavier workpieces, while possessing precise running accuracy and very high anti-overturning moment capability. The slewing bearing supporting the worktable is the key to accomplish this important mission. Previously, most of the domestic workbenches chose thrust bearings and radial bearings to cooperate. This arrangement has a complicated structure and uses more materials. Especially when large box parts are placed, the space of the entire machine tool is larger. It is also difficult to install and adjust the pre-tightening of the slewing bearing, the alignment is more difficult to guarantee, and the overall accuracy of the worktable is difficult to improve.

Therefore, more designs are now beginning to choose cross-roller bearings with a more compact structure, which not only saves material costs, but also simplifies the design, higher limit speed, better operating accuracy and stability, and stronger load-bearing capacity and rigidity. This article introduces how to apply cross roller bearings on vertical lathes to achieve their perfect engineering performance.

1. Runout accuracy

Bearing runout can be divided into synchronous runout and asynchronous runout. The impact of synchronous runout on the overall runout of the workbench can be minimized by grinding the work surface, but the impact of asynchronous runout cannot be eliminated in this link. It is mainly It is determined by the outer diameter tolerance and roundness of the roller. Therefore, the better the asynchronous runout control of the bearing, the smaller the final radial and axial runout of the worktable, that is, the higher the running accuracy. When selecting bearing brands and accuracy grades, it is recommended not to only focus on the bearing assembly runout, but to have a thorough understanding of the accuracy standards that affect the asynchronous runout of the bearing.

2. Bearing fit

When selecting the bearing, it is recommended that the inner ring and the shaft, and the outer ring and the gear ring are tightly fitted. Since the outer ring is a rotating part, the tight fitting amount should be slightly larger. The inner ring will be pressed down by the end cap and adjusted to a certain pre-tightening amount, so the tight fitting amount should be slightly smaller. However, if the inner ring is considered to be a static part, and the inner ring and the shaft are designed to be loosely fitted, there is a radial gap between the inner ring and the shaft, it is possible that the inner ring may be deflected when the inner ring is installed, locked or the bearing is loaded. Oblique, that is, eccentricity occurs. This eccentricity will cause stress concentration on the boundary of the contact area between the roller and the raceway, causing serious scratches, cratering and peeling, and ending the bearing life earlier.

Three, shape and position tolerance

The mounting surface of the shaft and the gear ring is required to have the same flatness, perpendicularity, roundness and cylindricity as the precision bearing. Controlling these shape and position tolerances can not only achieve better assembly accuracy, but also avoid excessive eccentricity of the inner and outer rings of the bearing to cause stress concentration, and extend the service life of the bearing. Regarding the processing standards of the form and position tolerances, it is recommended to consult the bearing supplier and match its bearing accuracy.

Fourth, the axial preload

In the cutting test of the vertical turning, the end face and the outer circle roughness of the workpiece are very concerned, and one of the keys to determine the advantages and disadvantages is the rigidity of the system. The system rigidity includes the rigidity of the frame structure, the rigidity of the supporting bearing, etc. The rigidity of the bearing often depends on its axial preload.

Therefore, it is particularly important to fully consider the effects of temperature and load and reasonably set the axial preload of the bearing.

Analysis on the Causes of the Failure of Bucket Wheel Machine slewing bearing

Slewing Bearing
Bucket wheel machine is an important production equipment that needs to be used during the transportation and loading and unloading of bulk cargo such as coal. The main purpose is to take materials from the storage yard. It is mainly composed of cantilever arm frame structure, mast structure, counterweight beam structure, cart structure, slewing mechanism, luffing mechanism, and walking mechanism. The slewing support is mainly used to support the upper structure of the bucket wheel reclaimer. The key component of bucket wheel reclaimer rotation work. In the internal structure of the bucket wheel reclaimer, the slewing bearing occupies a large part of the area. Because of its large volume and located at the upper and lower joints of the bucket wheel machine, the failure rate is high during the working process. Today, the editor will analyze the reasons for the failure of the bucket wheel slewing ring.

1. The main failure of bucket wheel reclaimer slewing bearing

Common failures of bucket wheel slewing ring can be summarized into two categories

1. The first category is caused by improper design, manufacturing and installation.

2. The other category is acquired problems caused by improper operation, use, and maintenance after production. The problems caused by acquired problems account for a larger proportion.

Bucket wheel slewing ring

2. The cause of the failure

1. In the manufacturing and processing of bucket wheel machines, in order to save processing and material costs, there is a problem that the main shaft is too thin, which causes the large shaft to easily break at the diameter of the driving wheel. In the processing of bucket teeth, manganese steel plates are used, which directly leads to the reduction of the service life of bucket teeth to one year.

2. If the installation is not in place, it will directly lead to the frequent tearing of the cantilever belt of the rotating mechanism, damage to the roller deflection of the walking device and other faults, which brings safety risks to the safe and stable operation of the equipment.

3. During the running-in period of the slewing ring, the lubrication status is poor, and frequent full-load work results in poor running-in of the raceway and rolling element pairs, which is manifested in the early excessive wear and fatigue pitting.

4. Fatigue type failure is a common failure of slewing bearing failure. When the rolling element and the raceway are under load and are in relative motion at the same time, under the action of this alternating load, the internal micro-cracks gradually expand to the surface and form flaking. Fatigue spalling will cause shocks during the operation of the slewing ring, aggravating vibration and noise.

5. The rolling elements are worn and broken, and the raceway is seriously deformed. Under the action of instantaneous large load, the raceway is locally deformed, which directly causes the wear, deformation and even rupture of the rolling elements, thereby causing the slewing ring to fail.

6. ​​The slewing bearing fixing bolts are installed too loosely, and they vibrate and disappear in the budding state during operation.

The above is a simple analysis of the cause of the failure of the bucket wheel slewing ring. For bucket turbines, once the slewing ring fails, the entire equipment can only be stopped, which affects the entire reclaiming process of the yard and causes greater economic losses. Therefore, we must analyze the common failure causes of the bucket wheel slewing ring operation, and study effective countermeasures to reduce the sudden failure of the slewing ring causing the bucket wheel to stop abnormally.

How to ensure the safe operation of single-row ball slewing ring? Four main points

Single-row ball slewing ring is one of the important parts of modern machinery and equipment, mainly composed of upper ring, lower ring and full ball. Its operating speed is very low, and it is usually used in many mechanical products, such as widely used in rotating equipment such as rotary conveyors, excavators, construction machinery, and small and medium-sized cranes. The safe operation of the single-row ball slewing bearing is very important, and it directly affects the working efficiency of the unloading equipment. So, how to ensure the safe operation of single-row ball slewing ring? Next, let’s follow the editor to understand it.

1. Choose a slewing bearing of good quality

Single-row ball slewing ring is an important part of the machine. And because the components are affected by factors such as the environment and the load during work, they can be regarded as consumables. We need to buy it frequently to maintain the normal operation of the machine. In this regard, we can start from the brand. If the machine itself is a well-known brand product, buy parts of the same brand. Because each brand uses different alloy formulations, there are subtle differences. When brands obsolete products, natural compatibility is yes. Next, buy a single-row ball slewing bearing, please pay attention to the toughness of the product. Because the parts are thin, many parts look good, but they are compensated after being placed on the machine for a long time. Actually choose, you can buy more brands in practice.

2. Timely lubrication work

is in daily operation. After working for a while, you should pay attention to its operating status. You can add some protective oil from time to time to effectively extend its service life.
Single volleyball slewing ring
Three, choose labyrinth ring seal

The sealing of the single-row ball slewing bearing is to prevent grease leakage and filling on the one hand, and on the other hand to prevent external dust, impurities and moisture from entering the bearing and affecting normal operation. Since single-row ball bearings mainly work in heavy load and low-speed work, the seal ring has two structures: rubber ring and labyrinth ring. The rubber seal itself has a simple structure. The advantages of small space and reliable sealing have been widely used, but its disadvantage is that the rubber sealing lip is prone to premature aging under high temperature conditions and loses sealing performance, so the working conditions under high temperature conditions are single. The volleyball slewing ring bearing should adopt labyrinth seal.

Four, working clearance

One of the key factors affecting the operation of the bearing is the working clearance of the bearing. The main factors affecting the working clearance of the bearing include the fit between the inner ring of the shaft and the shaft, the fit between the outer ring of the bearing and the bearing chamber, and the bearing’s own play under non-assembly conditions. Various objective factors such as gaps, equipment operating status and turnover environment. The same mechanical equipment may have different clearances under different operating conditions. To ensure the guarantee effect of the bearing during the operation of the equipment, the selection of the bearing, the determination of the matching relationship, the understanding of the working conditions, the lubrication and maintenance, etc. Comprehensive consideration in many aspects.

The above is the answer to how to ensure the safe operation of the single-row ball slewing ring. Since it is mainly used for large machines, it should be checked and maintained regularly during use to avoid affecting the use of the entire machine.

What if the slewing bearing rusts?Method to prevent rust of rotary bearing

Slewing bearings are important parts in many modern machinery and equipment, because their performance is more unique than other mechanical parts, including significant advantages in anti-corrosion performance. However, if the slewing bearing is not produced in strict accordance with the cleaning and anti-rust regulations and the requirements of the oil seal and anti-rust packaging, the bearing parts in the processing process and the finished bearing products after assembly shall be treated with rust; or the anti-rust used in production The quality of rust lubricating oil, cleaning kerosene and other products cannot meet the requirements of the process technology, and the use of inferior anti-rust lubricating oil will cause the bearing to rust. So what can be done to prevent it from rusting? Today, the editor will share with you several ways to prevent the rust of turntable bearings.

1. Surface cleaning method

Cleaning must be based on the nature of the surface of the rust-prevented material and the prevailing conditions, and an appropriate method must be selected. Generally, there are solvent cleaning method, chemical treatment cleaning method and mechanical cleaning method. When the surface is dry and cleaned, it can be dried with filtered dry compressed air, or dried with a dryer at 120~170℃, or dried with clean gauze.

2. Method of applying anti-rust oil

1. Brushing method

This method is suitable for slewing bearings or special-shaped bearings that are not suitable for immersion or spraying. When brushing, it is necessary to pay attention not to produce anti-rust oil accumulation, and of course to prevent leakage.
Slewing ring
2, spray method

Some large slewing bearings cannot be oiled by immersion method, generally use about 0.7Mpa pressure filtered compressed air to spray in clean air. The spray method is suitable for solvent-diluted anti-rust oil or thin-layer anti-rust oil, but complete fire protection and labor protection measures must be adopted. This method is mostly used for rust prevention of some large slewing bearings.

3, soaking method

The slewing bearing is soaked in anti-rust grease, and a thick layer of anti-rust grease can be adhered to its surface. The thickness of the oil film can be achieved by controlling the temperature or viscosity of the anti-rust grease, and this layer of grease can effectively isolate it from The contact of air achieves the effect of rust prevention.

The above are several ways to prevent rusty slewing bearings. I hope everyone can help after reading them. In addition, when we use the bearing, do not directly touch the bearing with your hands, because when sweat contacts the bearing, a layer of sweat film will be formed on the bearing surface. The sweat film will cause electrochemical effects on the bearing and corrode the bearing. Therefore, use special tools such as special gloves or finger cots to pick up the bearing, and do not touch it directly with your hands.

Discussion on the stability of slewing bearings

For equipment installed with slewing bearings, corresponding performance is the focus of users’ attention, and often requires high accuracy. In the application of equipment, the stability of the slewing bearing can meet the requirements of the special work nature of construction equipment, including bearing large axial load, radial load and overturning moment and other comprehensive loads. The following editor will discuss the stability of the slewing bearing with everyone:

In the design of accessories, the rolling elements are usually separated by separate blocks. This structure can maintain the smoothness of movement, so it is widely used. Special applications require special ball or roller spacers. Bearings installed on horizontal shafts or continuously rotating generators and bearings used in occasions with high requirements for positioning and reliability can use strip combined cages to keep the rolling elements in the correct circumferential position .

The purpose of using cages for slewing bearings is very clear: improve bearing rotation performance and efficiency, consolidate bearing stability and reliability, improve bearing design life and service life, and solve the problems of uniform force and bearing structure under complex working conditions . Integral cage-segment cage-copper cage-steel cage-polyurethane cage-nylon cage-polytetrafluoroethylene cage-PA cage, and composite material cage.

Slewing bearing

In addition, for slewing bearings, stability and reliability are the two core indicators considered in the selection and design of slewing bearings. The main process design considerations are: structure; material; modulation hardness and quenching hardness; bearing rolling elements and The height and wall thickness ratio of the ferrule; machining accuracy; the material, structure and type of the cage, such as the integral cage, can obviously improve the rotation performance and life of the bearing; the lubrication system and the sealing system; the level of installation and debugging; the daily maintenance Frequency; application of mature design.

In order to ensure the stability of construction equipment, the design of slewing bearings pays more attention to the rationality of the structural configuration, but in many cases, gear teeth can be machined on the inner or outer ring of the bearing to simplify the structure of the drive system. In order to avoid problems, when determining the structure of the drive system, you should seek help from related personnel in the gear.

The above is the discussion on the stability of the slewing bearing. The design of pipe fittings pursues higher performance. However, in actual applications, once installation, use or maintenance is improper, various problems may arise, such as in the slewing bearing. There was a problem of excessive shaking during use. Common causes for this are loose mounting bolts, causing shaking during work; insufficient rigidity of the steel structure supporting the slewing bearing, elastic deformation during loading, resulting in overall swaying of the slewing bearing, etc., in order to ensure the normal use of the slewing bearing, if you If there is shaking in the machine, you must stop the machine for inspection in time to prevent long-term shaking from causing greater damage to the slewing bearing.

What should I do if the slewing ring is rusted? Ways to prevent rust of slewing bearings?

Slewing bearings are important parts in many modern machinery and equipment, because their performance is more unique than other mechanical parts, including significant advantages in anti-corrosion performance. However, if the slewing bearing is not produced in strict accordance with the cleaning and anti-rust regulations and the requirements of the oil seal and anti-rust packaging, the bearing parts in the processing process and the finished bearing products after assembly shall be treated with rust; or the anti-rust used in production. The quality of products such as rust lubricating oil and cleaning kerosene does not meet the requirements of the technical regulations, and the use of inferior anti-rust lubricating oil will cause the bearing to rust. So what can be done to prevent it from rusting? Today, the editor will share with you several ways to prevent the rust of turntable bearings.

  

   1. Surface cleaning method

  

  Cleaning must be based on the nature of the surface of the rust-prevented material and the prevailing conditions, and an appropriate method must be selected. Commonly used are solvent cleaning method, chemical treatment cleaning method and mechanical cleaning method. When the surface is dry and clean, it can be dried with filtered dry compressed air, or dried with a dryer at 120~170, or dried with clean gauze.

  

   2. Method of applying anti-rust oil

  

   1. Brushing method

  

  This method is suitable for slewing bearings or special-shaped bearings that are not suitable for immersion or spraying. When brushing, it is necessary to pay attention not to accumulate rust prevention oil, and of course to prevent leakage.

Slewing ring 

  2, spray method

  

  Some large slewing bearings cannot be oiled by the immersion method, and generally use filtered compressed air with a pressure of about 0.7Mpa to spray in a clean air place. The spray method is suitable for solvent-diluted anti-rust oil or thin-layer anti-rust oil, but complete fire protection and labor protection measures must be adopted. This method is mostly used for rust prevention of some large slewing bearings.

  

  3, soaking method

  

The slewing bearing is soaked in anti-rust grease, and a thick layer of anti-rust grease can be adhered to its surface. The thickness of the oil film can be achieved by controlling the temperature or viscosity of the anti-rust grease, and this layer of grease can effectively isolate it from The contact of air achieves the effect of rust prevention.

  

   The above are a few ways to prevent rusting of slewing bearings. I hope everyone can help after reading them. In addition, when we use the bearing, do not directly touch the bearing with your hands, because when sweat contacts the bearing, a layer of sweat film will be formed on the bearing surface, which will cause electrochemical effects on the bearing and corrode the bearing. Therefore, use special tools such as special gloves or finger cots to pick up the bearing, and do not touch it directly with your hands.

What requirements should the selection of bearing grease meet to choose the right one?

For bearings, lubrication is very important. The use of grease can reduce friction. Excellent high-temperature oxidation stability can ensure the long-term normal operation of the lubricated parts at high temperatures, provide comprehensive protection to the bearing, and greatly extend the service life of the bearing. However, during mechanical operation, due to the working conditions (load, speed, temperature), working conditions (continuous operation, intermittent operation, vibration and shock, etc.) and working environment (humidity, temperature, pollution degree, etc.) during bearing rotation and friction The choice of grease will also be different. So, what requirements should the selection of bearing grease meet?

1. The use temperature of the grease should be at least 20-30 degrees lower than its dropping point

When the use temperature is high, the grease with good oxidation resistance, low evaporation loss and high dropping point should be selected. When the operating temperature is low, low starting torque and relatively low viscosity grease should be selected. For example, grease based on synthetic oil.
2. The selected grease should be compatible with the use speed of the lubricated friction pair

At high speeds, use low-viscosity base oils with greater penetration. For low-speed grease, you should choose a grease with a high penetration grade made of a high-viscosity base oil.

3. The selected grease should be suitable for the load

For heavy loads, a grease with high base oil viscosity and high thickener content should be selected. When the load is particularly heavy, care should be taken to select grease with extreme pressure additives or fillers (molybdenum disulfide, graphite). For medium and low loads, grease with a short, medium viscosity base oil of No. 2 consistency soap fiber structure is generally used

4. The selected grease should be compatible with the environmental conditions used
In an environment where the air is humid or in contact with water, greases with good water resistance such as calcium-based, lithium-based, and lithium complex-based should be used. When there is a lot of dust, you should choose a thicker and harder (that is, a higher grade) grease, which has better sealing performance and can prevent impurities from mixing into the friction pair. In a strong chemical environment, synthetic oil greases that resist chemical media such as fluorocarbon grease should be used.

slewing bearing

5. The selected grease should be compatible with the grease supply mode of the friction pair

When it is a centralized grease supply, you should choose 00~1 grease. For parts where grease is regularly filled with grease guns, grease cups, etc., grease No. 1 to No. 3 should be selected. For long-term use without changing the grease, you should choose No. 2 or No. 3 grease.

6. The selected grease should be compatible with the working state of the friction pair

For example, when the vibration is large, use high-viscosity, adhesive and vibration-damping grease, such as high-viscosity cycloalkyl or compound soap-based grease thickened with mixed base lubricating oil.

7. The selected grease should be suitable for its purpose of use

The grease used for lubrication must be specifically selected according to the type of friction pair, working conditions, working conditions, environmental conditions and grease supply methods. For protective grease, it should be able to effectively protect metals from corrosion. For example, to protect parts in contact with seawater, aluminum-based grease with strong adhesion and water resistance should be selected. General protection grease can be made of solid hydrocarbon thickened high-viscosity base oil. For the sealing grease, attention should be paid to its resistance to the solvent of the sealed medium.

8. The selected grease should be as good as possible to reduce the variety of grease

In the case of meeting the requirements, try to use lithium-based grease, complex soap-based grease, polyurea grease and other multi-purpose general-purpose greases. In this way, the variety of grease is reduced, the management of grease is simplified, and the long service life of pleiotropic grease can reduce the cost of grease, reduce maintenance costs, and improve economic benefits.

The above is the answer to what requirements should be met for the selection of bearing grease. In daily bearing maintenance and repair, various types of grease are used, including sodium-based, calcium-based, lithium-based, barium-based, aluminum-based grease, etc. Etc. to ensure the normal operation of bearings and other components