Analysis on the Causes and Preventive Measures of Vibration of Slewing Bearings in Operation

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Slewing bearing can also be called turntable bearing and rotating bearing. It is one of the important parts of modern construction machinery slewing devices, such as excavators, cranes, pile drivers, graders, road rollers, dynamic compactors, roadheaders, tower cranes, etc. Slewing bearings are always used. Due to the large load during operation and the harsh working environment, the operation is not smooth (jitter) and excessive noise (abnormal noise) failure occurs. So, what is the cause of jitter when the slewing ring is running? How to prevent it? Next, follow the editor to understand it.

Reasons for the vibration of the slewing bearing during work

1. The internal machining accuracy of the slewing ring

The machining accuracy of the steel balls inside the slewing ring and the machining accuracy of the internal raceway are not high, or there are quality defects and the lack of lubricating oil in the raceway. The roller collides with the spacer, which directly affects the smoothness of the slewing ring operation and the level of noise, so check When the slewing bearing is defective, sometimes the frequency of failure is reduced by replacing the steel ball.

2. The gear processing is not precise enough

The gear accuracy grade of the slewing ring should be between 7 and 11, which determines the stability of the slewing ring transmission, the uniformity of load distribution and the transmission accuracy. The higher the gear accuracy, the denser the contact spots on the meshing tooth surface, so that the noise value is reduced and the smooth operation is improved.

3. Welding defects of upper and lower supports

If the welding quality is not up to standard, the weld defects need to be repaired and repaired. During repair welding, not only new welding stress will be generated, but also the flatness of the machined mounting surface will be greatly affected. At the same time, the current generated by welding will also cause a certain amount of internal rolling elements and raceways when passing through the slewing ring. damage. In addition, if the assembly errors generated in the manufacturing and assembly, the pin and bolt pre-tightening in the on-site installation do not meet the specified requirements, abnormal noise or jitter will also occur.

4. Quality problems of gears and starting motors

Because the gear has been loaded for a long time, small pieces of metal or strip-shaped metal iron filings will fall off near the pitch line of the tooth surface, resulting in pitting or tooth gnawing. The pitting corrosion of the tooth surface continues to expand with the increase of working time, so that the meshed tooth profile is damaged, the noise and impact during rotation increase, and the metal particles that impact repeatedly accelerate the wear of the tooth surface, forming a vicious circle. In addition, the manufacturing and assembly of the starter motor in the slewing mechanism has its own defects, which produces shock jitter, and the meshing process between the drive wheel and the support is unstable, which also increases the jitter frequency and the decibel of abnormal noise.

Preventive measures against shaking of slewing ring

1. Installation and operation

High-strength bolts should be used for the installation of the slewing bearing. The bolts and nuts should meet the requirements of GB3098.1 and GB3098.2. Spring washers are prohibited. Before the installation bolts are tightened, the meshing adjustment of the large and small gears (backlash) must be carried out to ensure that the meshing of the slewing ring and the pinion meets the requirements. The mounting bolts should be tightened at 180°. The mounting plane must be clean and flat, free of burrs, iron filings and other debris. The plane must meet the following requirements: The slewing bearing often has broken teeth during operation, so it is also in operation. Consider the influence of wind on the slewing support. If the boom cannot rotate freely with the wind after the specified wind power is exceeded or the operation is stopped, the gear or slewing bearing meshing with the support may be damaged, and serious safety accidents may occur. Therefore, detailed inspections should be done during installation and operation.

2, tightening bolts

The connecting bolts of the slewing bearing and the upper and lower supports are subjected to axial pulsating load in addition to the pre-tightening force, which will cause the bolts to elongate or the connecting surface to deform, which makes the bolts loose. After the bolt connection is loosened and the pre-tightening force fails to meet the requirements, the axial clearance increases, the rolling elements are rotated by a large overturning moment, and the raceway edge is subjected to huge contact stress, causing damage to the raceway edge. Therefore, the tightening of the slewing bearing bolts must be checked regularly to make it reach the specified pre-tightening force, which is generally 400-500N.m.

3, internal lubrication of the slewing ring

In daily use, each part should be lubricated according to the lubricant, lubrication method, and lubrication cycle in accordance with the instructions in the operation manual in time and on time. Corresponding ball slewing bearings are generally filled once every 100 hours of operation, and roller slewing bearings are filled once every 50 hours. The lubrication cycle should be shortened for the special working environment with a lot of dust, high humidity and high temperature difference. Each lubrication must fill the raceway until the lubricating oil seeps out. While filling, the slewing ring needs to be slowly rotated to make the grease evenly filled. By adding lubricating oil for maintenance, the friction between the gear pairs can be reduced, and the wear rate of the gear ring can be slowed down. The oil film formed can also act as a shock absorbing ring, eliminating part of the vibration energy generated during operation. In addition, the lubricating oil film can also lubricate and clean the friction surfaces well, prevent rust, and eliminate the influence of iron filings on the friction surface. Thereby reducing the friction noise of operation and increasing the service life of the support.

The above is the analysis and explanation of the reasons and preventive measures for the shaking of the slewing ring during operation. I hope it will be helpful after reading it. Luoyang Hengguan Bearing is a slewing ring/slewing bearing comprehensive entity enterprise integrating design, research and development, production, sales and service. Mainly engaged in a variety of high-precision slewing bearings, large thrust ball bearings, non-standard special-shaped bearings and other products, and also provide customers with customized exclusive bearing products. Everyone is welcome to call for detailed consultation.

What does the tolerance of the slewing ring mean?

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There are many technical indicators that reflect the accuracy of slewing bearings and slewing bearings, such as axial clearance and radial clearance, end jump and radial jump, parallel difference and inside and outside difference, roughness, dimensional tolerance, position tolerance, etc. So, do you know what the tolerance of slewing ring refers to?

The dimensional accuracy and rotation accuracy of the slewing bearing are based on ISO and JIS standards. For machinery that requires high precision and high-speed operation, it is recommended to use bearings with accuracy grade 5 or above. Deep groove ball bearings, radial thrust ball bearings or cylindrical roller slewing bearings are suitable for machinery with high operating accuracy.

Slewing ring

The inner diameter and outer diameter of the rolling slewing ring are manufactured according to standard tolerances. The tightness of the slewing ring inner ring and shaft, outer ring and seat hole can only be achieved by controlling the tolerance of the journal and the tolerance of the seat hole. Tolerance includes shape tolerance and position tolerance.

When the dimensional tolerance accuracy is determined, the shape tolerance has an appropriate value, that is, generally about 50% of the dimensional tolerance value is used as the shape tolerance value; about 20% of the dimensional tolerance value in the instrument industry is used as the shape tolerance value; heavy industry Approximately 70% of the dimensional tolerance value is used as the shape tolerance value. This shows that. The higher the dimensional tolerance accuracy, the smaller the proportion of the shape tolerance to the dimensional tolerance. Therefore, when designing the size and shape tolerance requirements, except for special circumstances, when the dimensional accuracy is determined, the 50% dimensional tolerance value is generally used as the shape tolerance value , Which is not only good for manufacturing but also good for ensuring quality.

There is also a certain relationship between shape tolerance and position tolerance. From the perspective of the cause of the error, the shape error is caused by machine tool vibration, tool vibration, spindle runout, etc.; while the position error is caused by the non-parallelism of the machine tool rails, the non-parallel or non-perpendicular tool clamping, and the effect of clamping force. As a result, from the definition of tolerance zone, the position error includes the shape error of the measured surface. For example, the parallelism error contains the flatness error, so the position error is much larger than the shape error. Therefore, under normal circumstances, when there is no further requirement, the position tolerance is given, and the shape tolerance is no longer given. When there are special requirements, the shape and position tolerance requirements can be marked at the same time, but the marked shape tolerance value should be less than the marked position tolerance value, otherwise, the parts cannot be manufactured according to the design requirements during production.

Slewing bearing

The slewing bearing and slewing ring have high precision, which represents the level of precision and processing technology, which means higher value. They are generally used for precision machine tools, precision equipment and high-precision instruments to achieve measurement and control, positioning and pointing. The runout is controlled at 0.02, ~ 0.05, the clearance value is controlled at 0.01-0.06, the roughness is controlled at Ra1.6/0.8, the hardness is uniformly distributed, the parallel difference is controlled at 0.015, and the dimensional tolerance must be in accordance with the requirements of the drawing.

Inspection before operation of mining machinery bearings

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After the bearing is installed, in order to ensure the smooth operation of the bearing, the inspection work before the bearing operation should be paid attention to.

For small machines, you can directly rotate the bearing by hand to see if it can run smoothly. In daily inspection operations, common poor operation phenomena mainly include: poor operation due to foreign objects, scars and indentations; poor operation due to improper installation; large installation errors due to too small clearance, etc. The reason is that the torque is too large, resulting in poor operation of the bearing, etc. If no abnormality is found after careful inspection, the bearing can be used for the next step of power operation.

For large machinery, manual rotation is not possible, but inertial operation can be carried out by stopping the power in time after starting without load, and then carefully observing the vibration and noise of the bearing and the actual contact of each rotating part to confirm that there is no After the abnormality, the next power rotation stage can be carried out.

Power rotation, this stage generally starts from the no-load low-speed stage and gradually increases to the rated operating speed. During the trial operation stage, the focus should be on checking: whether there is abnormal sound in the bearing, whether there is lubricant leakage, and whether the bearing has a large temperature rise change, etc. If an abnormality occurs during the trial operation of the bearing, the bearing should be carefully inspected even if the operation is stopped, and the bearing should be disassembled and inspected if necessary.

The temperature rise of the bearing can usually be known by inspecting the bearing housing, but it is also possible to directly inspect the temperature of the outer ring of the bearing with the aid of the oil filling hole, so that the inspection result obtained will be more accurate. The bearing temperature of mining machinery generally rises gradually from the beginning of the bearing operation, and the bearing temperature usually tends to stabilize after rising to a certain temperature. If the bearing is installed improperly, it may cause the bearing temperature to rise sharply and produce abnormal temperature rise. In addition, excessive bearing lubricant, too small internal free gap, severe wear of the ball, high-speed rotation, etc., may also cause a transitional temperature rise of the bearing.

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

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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

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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

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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

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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

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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

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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

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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.