slewing bearings price
1.Why do not use elastic washers for the mounting bolts of the slewing bearing?
The installation and operation manual of the slewing ring bearing tells you that elastic washers cannot be used when installing the connecting bolts of the slewing bearing, so what effect will the elastic washer have on the slewing ring bearing? Why can’t elastic washers, which are widely used on other mechanical equipment, be used on slewing ring bearings?
First, we must first understand the function of the elastic washer. The elastic washer has a certain elasticity, which can prevent the bolts and nuts from loosening and falling off during the use of the equipment. It is suitable for many mechanical equipment with vibration. However, the slewing ring bearing generally bears a large load, so the strength requirements of the bolts are relatively high.
Usually, grade 10.9 bolts and nuts are used. The high-strength bolt connection mainly relies on the frictional resistance between the bolt and the connected parts to achieve locking. Unlike ordinary bolts, which can be prevented from loosening by elastic washers, the use of thread tightening glue for the bolts of slewing bearings is the correct anti-loosening measure.
Second, the slewing ring bearing does not use elastic washers to prevent the deformation of the slewing ring bearing. The contact area of the elastic washer is not as large as that of the flat washer, and it is not reliable under the action of the large pre-tightening force. The large pre-tightening force of the bolt may It causes plastic deformation of the slewing ring bearing mounting surface in contact with the spring washer.
With the increase of use time, the deformation will become larger and larger, the pre-tightening force of the bolt will become smaller, and the bolt will loosen. The slewing ring bearing is usually subjected to overturning force. The overturning force during operation will aggravate the plastic deformation of the slewing ring bearing mounting surface, and may also cause the elastic washer to open, resulting in rapid damage to the bolt and the slewing ring bearing.
Third, a suitable flat washer can increase the contact area between the bolt and the slewing ring bearing, preventing the plastic deformation of the contact surface of the slewing ring bearing when the bolt is pre-tightened by the workpiece with insufficient hardness. Due to the increase in the contact area during the use of the slewing ring bearing Bolted connections maintain high reliability under overturning forces and shock loads.
When installing the slewing ring bearing, elastic washers cannot be used. You can choose a suitable flat washer. When installing the bolts, you need to tighten the bolts according to the pre-tightening torque specified in the manual. Use thread tightening glue to prevent the bolts from loosening.
2.What problems will affect the service life of the slewing bearing?
Slewing ring bearing is an important core component of equipment rotation. If the slewing bearing fails during the operation of the equipment and cannot rotate normally, it will cause equipment downtime and production paralysis.
It is generally very troublesome to replace the slewing bearing, so everyone generally chooses a slewing bearing with reliable quality. The bearing is installed on its own equipment. After the slewing bearing is installed, everyone hopes that the slewing bearing can work stably and reliably, and the longer the service life, the better. What are the factors that affect the life of the slewing bearing?
1. The problem of the equipment itself
1. The rigidity of the equipment installation foundation is insufficient. When the slewing ring bearing is running under heavy load, the rigidity of the equipment installation foundation cannot provide a good support for the slewing bearing, resulting in elastic deformation of the slewing ring bearing, uneven force when the slewing ring ring bearing rotates, and long-term use. It will cause damage to the slewing bearing and affect the service life.
2. The flatness of the installation foundation is not good. There will be a gap between the slewing ring bearing and the installation foundation during installation. The correct way is to use a gasket with a suitable height to level the gap, but the operator often ignores this during installation and use. ,
In this case, the slewing bearing will warp and deform after the bolt is pressed, causing the channel to be deformed. After the deformation, the channel and the steel ball are not in good contact, and the clearance value is not uniform and the rotation is inflexible, which affects the use of the slewing bearing. life.
2. Overload operation
When the slewing ring bearing is designed, the bearing capacity has been clarified, such as how much load and how much overturning moment it can bear. If the actual load exceeds the bearing capacity of the slewing bearing during use, it belongs to overload operation.
During overload operation, the load on the steel ball exceeds the limit load, and there will be collapse blocks, fatigue spalling, and craters in the raceway. The collapse will cause serious damage to the slewing bearing. It is possible that a short-term overload operation will cause devastating damage to the slewing ring bearing, which will seriously affect the service life of the slewing ring bearing, and overload operation may easily lead to safety accidents.
Pollution can also lead to premature damage of the slewing ring bearing. Pollution means that dust particles, water, etc. enter the bearing raceway, or foreign matter enters the tooth meshing of the slewing bearing. Damage to the slewing bearing, contaminants will also cause the slewing bearing to corrode, resulting in the deterioration of the grease, which will shorten the life of the slewing bearing.
The lubrication system can reduce the friction coefficient when the slewing ring bearing is running, achieve very small rolling friction or sliding friction, and also prevent the slewing bearing from rusting. Damaged teeth and lack of long-term lubrication are one of the main causes of premature failure of slewing ring bearings.