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.

Tips to install slewing bearing

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Those engaged in the machinery industry should be familiar with slewing bearings, and they should have some understanding. You must have learned some related knowledge. Today we will lead you to a better understanding of slewing bearings. I think everyone is also interested in how to install the slewing bearing. Next, let’s learn about the main points of the slewing bearing installation guide, so that it can be applied in the future.

1. Before installing the slewing bearing, check the installation surface of the main engine. The support should have sufficient strength, the connecting surface should be machined, and the surface should be smooth and free of debris and burrs. For those that cannot be machined to achieve the required flatness, special plastics with high injection strength can be used as fillers to ensure the accuracy of the installation plane and to reduce vibration. The ring of the slewing bearing has a quenched soft zone, which has a mark S on the end face of the ring. When installing, the position of the soft zone should be placed in the non-load area or the non-recurrent load zone (the plug hole is always at the soft zone ).

The installation of the slewing ring needs to master six magic weapons. Second, when installing the slewing ring, you should first perform radial positioning, tighten the mounting bolts crosswise, and check the rotation of the bearing. In order to ensure the smooth transmission of the bearing, the gear mesh should be checked before the mounting bolts are not tightened. There should be sufficient pre-tightening force when tightening the bolts, and the pre-tightening force should be 70% of the yield limit of the bolt material. The mounting bolts should be equipped with quenched and tempered flat washers, and spring washers are strictly prohibited. After the slewing bearing is installed, put it into operation. After 100 hours of continuous operation, check whether the pre-tightening torque of the mounting bolt meets the requirements. Repeat the above inspection every 500 hours of continuous operation.

3. After the slewing bearing is installed, an appropriate amount of grease should be filled, and the slewing bearing should be filled while filling to make the grease evenly distributed. The slewing bearing will inevitably lose part of the grease after working for a period of time. Therefore, the slewing bearing in normal operation should be refilled every 50 to 100 hours. For slewing bearings that work in high temperature environments or dusty conditions, the period of adding lubricating grease should be appropriately shorter. When the machine is to be shut down for storage, it must also be filled with sufficient grease.

4. Packaging, transportation and storage of the slewing ring: Before packaging the slewing bearing, the inner and outer raceways need to be coated with anti-rust lubricating grease, then wrapped with plastic film, compound kraft paper, and then wrapped with industrial wrapping tape for inner packaging. The outer packaging adopts special wooden box or iron box.

5. The bearing should be placed horizontally on the vehicle during transportation, and measures to prevent sliding and vibration should be taken, and auxiliary support should be added when necessary.

6. The bearing should be placed horizontally on a dry, ventilated and flat place, and should be kept away from chemicals and other corrosive items during storage. If multiple sets of bearings are stacked, three or more wooden spacers of equal height should be evenly placed along the circumference between each set, and the upper and lower spacers should be placed in the same position. Bearings that need to be stored after the anti-rust period should be cleaned and anti-rust treated again.

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

/分类： /作者：

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.