Heavy duty precision custom bearing housing
The slewing bearing housing is a large and extra large bearing housing that can accept comprehensive load and special structure. It has the characteristics of compact structure, sensitive rotation and convenient maintenance. Where there is a bearing, there must be a support point. The inner support point of the bearing is the shaft, and the outer support is a commonly known bearing seat
Since one bearing can use different bearing seats, and one bearing seat can also use different types of bearings at the same time, there are many varieties of bearing housings. The bearing housing is easy to be included, and many large foreign bearing companies also have their own bearing housing catalogue. However, the same bearing housing models are not exactly the same in different company samples. For different applications of standard bearing housings, housings with different materials such as grey cast iron, ductile iron and cast steel, stainless steel, plastic special housings are available.
According to the different requirements of the bearing and the bearing housing, the classification of the bearing housing is not completely the same. When using it, it should be carefully checked according to the design
Classified according to the shape of the bearing housing:
The outer spherical bearing is also called the bearing unit (SKF's statement). When there is no bearing, it is called an outer spherical bearing. The outer spherical bearing housing is divided into 200 series according to the bearing series. 500 series. 300 series. 600 series. XOO series.
The outer spherical bearing housing is divided into a vertical seat (P seat), a square seat (F seat), a diamond seat (FL seat), a circular seat (C seat), a boss circular seat (FC seat), and a boss Square seat (FS seat), dark hole seat (PA seat), hanging seat (FA seat).
Integral (ie non-separable) vertical housing base, bearing housing with screw fastening. These vertical housing blocks were originally developed as axle boxes for light rail trucks, but can also be used with conventional vertical housing sets. Non-separate vertical housing blocks are more rigid than split housings and some can withstand heavier loads. The outer spherical bearing housing also belongs to the integral seat.
The split bearing seat can be divided into SN2, 5, 3, 6 series, SNL2, SNL5 and SD with 2, 5, 3, 6, 3100, 3000 and 3200 [1] according to the different bearings selected and the requirements of the shaft.
The bearing housing is divided into: split bearing housing, sliding bearing housing, rolling bearing housing, flanged bearing housing, and outer spherical bearing housing.
The slewing bearing housing is a large and extra large bearing housing that can accept comprehensive load and special structure. It has the characteristics of compact structure, sensitive rotation and convenient maintenance. Compared with ordinary bearing housings, turret housings have the following distinct features:
1. Dimensions
The diameter is usually 0.4cm~10m and the maximum is 40m.
2. High carrying capacity
Normally, axial loads, radial loads, and overturning moment loads can be accepted.
3. Low speed
The task speed is lower than 10r/min, and in a few cases, it does not make a continuous rotation, and only rotates within a certain angle to make a swing motion.
4. With housing for housing
It can be fastened to the upper and lower supports with screws.
5. No central axis
A rotating drive gear is provided on the inner or outer ring.
6. With smooth oil hole and sealed installation.
The important construction methods of the slewing bearing housing are: four-point contact ball turret bearing seat, double row angular contact thrust ball slewing bearing seat, interspersed cylindrical roller slewing bearing seat, inserted tapered roller slewing bearing seat, three rows of cylindrical roller Turntable bearing housing.
According to whether the tooth can be scattered and the gear is scattered, it is divided into different structures such as gearless, external gear or internal gear.
Among them, the four-point contact ball slewing bearing housing has high static bearing capacity, and the inserted cylindrical roller turret bearing seat has high dynamic bearing capacity. The inserted tapered roller turret bearing seat can improve the supporting rigidity and the rotation precision through the application of the preload. The three rows of cylindrical rollers cooperate with the slewing bearing seat to increase the height of the bearing seat to improve the bearing capacity, and the load identification has different raceway acceptance, so under the same force condition, the diameter of the bearing seat can be greatly reduced, thus making the host More compact, it is a turret bearing with high bearing capacity.
The slewing bearing housing is commonly used in large-scale slewing installations such as lifting and transporting machinery, mining machinery, construction machinery, port machinery, ship machinery, and high-precision radar.
Wear problem
Wear is the most common problem with housings, and bearing block wear often occurs.
Repair method
The conventional method generally uses post-weld machining to repair, and the surfacing causes the surface of the component to reach a very high temperature, causing deformation or cracking of the component, and the downtime is greatly prolonged by machining to obtain the size. The use of polymer composite materials for on-site repair has no thermal influence, and the thickness of repair is not limited. The wear resistance of the product and the concession of metal materials are not guaranteed, ensuring 100% contact and repair of the repaired parts, reducing equipment. Shock shocks to avoid the possibility of wear. On-site repair to avoid machining methods.
Repair process
Generally only four steps are required:
1. Surface treatment, it will be necessary to repair the surface of the bearing seat to remove oil and moisture;
2. Reconcile the repair material;
3. Apply the material and evenly spread the material on the bearing seat repairing part, filling and firming;
4. Wait for the material to solidify, and heat the surface of the material to accelerate the curing of the material.
The general bearing chamber wear can be repaired in 3-6 hours. The operation is simple and easy to learn. No special equipment and special training are required. Compared with laser welding and cold welding, it saves time and effort. The cost is only 1/5 of the general repair cost. 1/10, on-site repair is to reduce equipment repair time and transportation costs.
Special attention should be paid to the following points during the use of the bearing housing:
(1) Use of the housing cooling system. The housing cooling water not only prolongs the service life of the housing but also improves production efficiency when used correctly. The material of the bearing housing is generally made of special bearing steel through various treatments. Even the best bearing steel has the limit of their use, such as temperature. When the bearing seat is in use, if the mold temperature is too high, it will easily cause the crack on the surface of the core early, and some bearing blocks will not appear more than 2000 cracks in the mold. Even if the bearing housing is in production because the bearing housing temperature is too high, the core has changed color, and even after measuring more than 400 degrees, such temperature is prone to cracking of the turtle when the mold release agent is chilled. The products are also prone to deformation, strain, and sticking. In the case of using the housing cooling water, the use of the release agent can be greatly reduced, so that the operator does not use the release agent to lower the temperature of the housing. The utility model has the advantages of effectively extending the life of the bearing housing, saving the die casting cycle, improving the product quality, reducing the occurrence of sticking and straining and sticking aluminum, and reducing the use of the releasing agent. It also reduces the loss of the ram and core due to overheating of the housing.
(2) The bearing housing must be preheated during the production process to prevent the sudden occurrence of hot metal liquid in the cold bearing housing and the occurrence of cracks in the turtle. The more complicated bearing housing can be liquefied with a blowtorch. Gas, good condition with mold temperature machine, relatively simple bearing seat can use slow injection preheating.
(3) It is very troublesome to clean the parting surface of the bearing seat. It is also easy to ignore. The operator uses kerosene to completely clean the bearing part parting surface, which not only prevents the bearing seat from being crushed. Moreover, after cleaning, the exhaust groove of the bearing seat which is blocked by the residue of the release agent or other dirt can be opened, which is favorable for the gas discharge in the cavity during the injection process to improve the product quality.
(4) If the bearing housing is equipped with neutron control, it is absolutely forbidden to have the signal line between the die casting machine and the bearing housing. The reason is very clear. In daily production, it is difficult to avoid water on the signal line, or The place where the joint is wrapped is easy to break, which causes short circuit with the machine. If the signal is wrong, the alarm will automatically stop and delay the time, and the signal will be disordered and the bearing seat will be broken. Cause unnecessary losses. Travel switch attention waterproof
