low price robotics slewing bearings

1.Why do not use elastic washers for the mounting bolts of the slewing bearings?

The installation and operation manual of the slewing bearing tells you that elastic washers cannot be used when installing the connecting bolts of the slewing bearings, so what effect will the elastic washer have on the slewing bearing?

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 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 bearings does not use elastic washers to prevent the deformation of the slewing bearing. The contact area of ​​the elastic washer is not as large as that of the flat washer. Under the action of the large pre-tightening force, the flat washer is not reliable, and the larger pre-tightening force of the bolt may be It causes plastic deformation of the slewing 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 bearing is usually subjected to overturning force.

The overturning force during operation will aggravate the plastic deformation of the slewing bearings mounting surface, and may also cause the elastic washer to open, resulting in rapid damage to the bolt and the slewing bearing.

Third, a suitable flat washer can increase the contact area between the bolt and the slewing bearing, preventing the plastic deformation of the contact surface of the slewing 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 bearing Bolted connections maintain high reliability under overturning forces and shock loads.

2.What material is the seal on the slewing ring made of?

Sealing is a component that prevents fluid or solid particles from leaking between adjacent joint surfaces and prevents external impurities such as dust and moisture from invading the interior of the machine.

Most rubber seals are made by molding, such as various extrusion seals, rotary shaft lip seals, reciprocating lip seals, composite seals, film seals, bellows seals, etc. Seals, piston ring seals, coaxial seals (or slip ring combination seals), etc.

There are many kinds of rubber seals, such as: nitrile rubber seals, fluorine rubber seals, silicone rubber seals, etc. The most commonly used seals for slewing bearings are nitrile rubber seals, fluororubber seals can be used at high temperatures, and silicone rubber seals can be used at low temperatures.

Nitrile rubber seal is a copolymer of acrylonitrile and butadiene monomers. It is mainly produced by low temperature emulsion polymerization. It has excellent oil resistance, high wear resistance, good heat resistance and strong adhesion. , so it is especially suitable for slewing bearings.

The normal operating temperature of nitrile rubber seals is -50℃~100℃, which can meet most working conditions and environments. Nitrile rubber is one of the most representative rubbers with comprehensive properties such as oil resistance, physical and mechanical properties and chemical resistance. First, the effective use of these characteristics can meet the use of various occasions.

The high temperature resistance of fluororubber seals is very good, which can be said to be the best among the current elastomers. 26-41 fluororubber can be used for a long time at 250℃. Fluoroelastomer has excellent heat resistance, oxidation resistance, oil resistance, corrosion resistance and atmospheric aging resistance.

It has been widely used in aerospace, aviation, automobile, petroleum and household appliances and other fields, and is an irreplaceable key material in the advanced defense industry.

Silicone rubber seals can generally be used at low temperatures from -70°C to -50°C, and special formulations can be used at -100°C. They have the characteristics of anti-oxidation, shock-proof, moisture-proof, low-temperature resistance, ablation resistance, and radiation resistance.

It is one of the important materials for aerospace and cutting-edge technology. It can be used for cold-resistant rubber and sealing parts of ablation-resistant and heat-resistant aging parts in the aviation industry.