A few days ago, Xiao Bian saw a piece of news: Dongfeng 5 tons of sprinklers suddenly spontaneously ignited, and another Dongfeng sprinkler that passed by was sent a “timely rainâ€. Fortunately, no major incident was caused. In general, the temperature in summer is increasing day by day, and the accident of spontaneous combustion of sprinklers is frequent. How can we avoid it? In fact, the self-ignition of the Dongfeng 5-ton watering vehicle requires "prevention" as the main factor, and the maintenance of the second one depends on support. Let's discuss in depth: How to prevent and avoid the spontaneous combustion of the Dongfeng 5-ton sprinkler.
Half of the auto-ignition of the Dongfeng 5-ton sprinkler is due to the aging of circuits and equipment, or the consequences of unauthorized conversion. Many sprinkler owners neglect to maintain the car because of the warranty period. In fact, on the contrary, vehicles that drive for four years should be more vigilant. Only by carrying out regular maintenance and maintenance can the hidden danger be killed in the cradle. This is where the essence of prevention lies.
Secondly, when the temperature is too high in the summer, the lighter is also a major hidden danger. Many male owners like to smoke in the car, of course, this will not cause a fire. But forgotten trains in the car will be detonated automatically after 2-3 hours exposure to poisonous hot sun. Smoking can, please use car cigarette lighter as much as possible to avoid leaving the train on the train. In addition, do not put any flammable or explosive materials on the vehicle, including the tailgate. For example: oil drums, fireworks, pressure vessels (air fresheners, mousses), perfumes, etc.
Again, you should pay more attention to road conditions and conditions when driving. Avoid getting items that are prone to spontaneous combustion into the car, such as paper, straw, etc. These objects are subject to high-speed friction in the car and can ignite causing the vehicle to self-ignite. When driving, you should pay more attention to whether there is odor in the car, such as: rubber burnt (tire and belt), plastic burning (circuit), smoke, etc., should stop immediately to find out the source of the odor. These abnormal smells are an early warning to us when the car is spontaneously burning. Don't ignore it.
Finally, if you notice smoke in the front cover, remember not to blindly open the hood. Because the front cover of the car is in an oxygen-deficient state in a confined state, the flame may not be able to burn. Once the front cover is opened swiftly, a large amount of oxygen inflow may cause the fire to suddenly increase. The correct approach is to call the police immediately after stopping in a safe location and prepare for fire extinguishing. Take the fire extinguisher in your hand and finally open the front cover.
Maybe some people would say, What are you afraid of? Anyway, I bought insurance, and I have an insurance company to claim compensation. This idea is wrong. Even if we exclude the possibility of personal injury, Dongfeng sprinkler spontaneous combustion is not included in the "all risks", the insurance company will reject the payment on the ground that "spontaneous combustion is a disclaimer clause." Therefore, for the Dongfeng Sprinkler, which has a long vehicle age or has been overhauled and greatly modified, it is advisable to insure the "additional auto-ignition damage insurance for vehicles" in addition to the full insurance coverage.
As the saying goes, you must be careful to drive for 10,000 years. Prevention is a necessary precondition for stopping the spontaneous combustion of Dongfeng 5-ton sprinklers. After all, no one wants to love the car and set aside the danger. The loss is definitely much more than other commodities.
Thrust roller bearings
Thrust roller bearings includes self-aligning thrust roller bearings, tapered roller thrust bearings, cylindrical roller thrust bearings and needle roller thrust bearings.
Structures:
1. 29000 type thrust self-aligning roller bearings, this type of bearings can carry both axial and radial load in which mainly is axial load. And it has low friction coefficient and fine self-aligning property. The roller of this bearing is unsymmetrical spherical roller, which can reduce relatively slip between roller and raceway in the operating. Also the long roller has big diameter and much quantity, so the load capacity is high. Generally it adopts oil lubrication, but under low speed circs will be grease lubrication.
NXZ mainly produce the following structures:
2.80000 type thrust cylindrical roller bearings and 90000 type thrust tapered roller bearings, this type can accommodate single-direction axial load, they have much higher axial carrying-capacity than thrust Ball Bearings; in additional, they have high rigidity and take up smaller space.. The thrust cylindrical roller bearings are applied in operation with low rotation speed; the rotation speed of thrust tapered roller bearings is a little higher than thrust cylindrical roller bearings.
3.350000 type double-directions thrust tapered roller bearings (SKF code), this type can accommodate larger double-direction axial load.
4. TTSV and TTSX type thrust full tapered roller bearings used on pressing-down device of mill, this type is full complement roller, can accommodate larger single-direction axial load.
Cage materials
Brass, brozen or steel solid cages are adopted.
Permissible tilt angle
The bearing axis of thrust tapered roller bearings and thrust cylindrical roller bearings are not permitted to be inclined. The bearing axis of thrust self-aligning Roller Bearing is permitted to be inclined, when the equivalent static load P0a≤0.05C0a, and when the shaft washer is slewing, the permissible tilt angle is:
Bearing series Permissible tilt angle
292 series 1.5°
293 series 2°
294 series 2.5°
The permissible tilt angle will decrease with the increase of the load.
Minimum axial load
When the bearings are slewing, as the rolling bodies are acted by centrifugal moment, the rolling bodies will slid with reference to the raceway, which will cause the shaft washer and housing washer to be separated. In order to ensure the normal operation of the bearings, certain axial load must be put on the bearing. The minimum axial load required is:
Thrust tapered roller bearings and thrust cylindrical roller bearings
C0a/1000≤Famin>A(n/1000)2
Thrust self-aligning roller bearings
C0a/1000≤Famin>1.8Fr+A(n/1000)2
In the equation: Famin Minimum axial load (kN)
Fr Radial load (kN)
C0a Basic static load rating (see bearing dimension table) (kN)
A Minimum load constant (see bearing dimension table)
n Rotational speed (r/min)
When the actual load acted on a bearing is less than the minimum axial load computed, a spring or other measures must be used to preload the bearing.
Dynamic equivalent axial load
Pa=Fa (Thrust tapered roller bearings and thrust cylindrical roller bearings)
When Fr≤0.55Fa Pa=Fa+1.2Fr (Thrust self-aligning roller bearings)
Static equivalent axial load
P0a=Fa (Thrust tapered roller bearings and thrust cylindrical roller bearings)
When Fr≤0.55Fa P0a=Fa+2.7Fr (Thrust self-aligning roller bearings)
Thrust Spherical Roller Bearing,Thrust Spherical Roller Bearing,Thrust Tapered Roller Bearing,Full-Type Tapered Roller Thrust Bearing
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