| Home>Bearing knowledge>Analysis of the types of faults in the sliding (smooth) bearings |
/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131";
Analysis of the type of fault in the sliding (smooth) bearing of the initiator
Source: China Bearing Network Time: 2018-02-25
| /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089'; |
There are many types of sliding bearings on an initiator; both the bushings and the bearing bushes are attributed to the sliding bearings. In order to ensure the accuracy of the starting machine, the working clearance requirements of these sliding bearings are also high. The cause of the sliding bearings of the initiating machine is the cause of the problem. Can be attributed to: smooth critical conditions and any disturbances that cause damage to the working space and any material that damages the oil film. For example, inaccurate adjustment of the device, bumping of the parts and poor hygiene, improper use, harmful chemical reactions, etc.; Induced damage to the sliding bearing. According to the US Cummins Initiator's problem analysis, the main reasons for the damage of the sliding bearing are four aspects. The percentage of these four aspects is the following:
1. Because the damage caused by hygiene is 45%,
2, because the damage caused by smoothness is 25%,
3, because the damage in terms of application and equipment is 15%,
4, because the external reaction and other aspects of the damage is 15%.
From this accounting ratio, we can see that the damage caused by the degree of hygiene is the main reason. Avoiding the damage caused by the poor hygiene is multi-faceted: ensuring the sanitation of the parts is only one aspect when assembling the machine; On the other hand, the initiator is in the process of operation. Operators and repairers must correctly use the timely protection view according to the rules; especially the initiators who work in the dusty and chemical raw materials environment for a long time; must adopt the method Avoid dust and chemical gas corrosion; ensure the life of the launcher. The outer bearing alloy layer of the spindle and the connecting rod in the initiator is the softest; the load is the largest; the simplest damage; so the following is the main bearing and connecting rod The appearance of the tile is damaged; the reason for the analysis; to avoid the repeated {TodayHot} obstacle repeated after the correction.
First, the problem caused by the hygiene problem:
1. Wear of small particles and foreign objects on the bearing pads:
When the oil filter element is in the oil drain plug of the engine oil bottom; the first few oils flowing out of the oil; the naked eye can be directly seen and more alloy powder; the bearing bush is now worn. This is because of the small The impurities of the particles enter the movement surface of the bearing alloy layer; although the bearing bush does not pose severe damage; however, such an image continues to develop; not only the early damage of the bearing bush; the shaft is also severely damaged; therefore, it is necessary to rely on the disease The reason for the timely removal; avoid damage to the components. After the fault is removed, the service life of the starter bush can not be calculated according to the normal wear time; because the abnormal wear of the small particles is equivalent to the normal wear of the machine for 2500 hours. .
The reason for the entry of fine particles is as follows: First, the filter function of the air filter is poor or the sealing of the air intake system is not good; the pipelines and joints of the intake system should be checked; whether there is a break or looseness; whether the filter element is loose or not, Whether the paper core has a break. Whether it is repair or protection of the entire intake system is very important; it is necessary to ensure reliability. Second, after the smooth oil is contaminated, participate in the initiator or the oil and the filter element is used for a long time. Blocked; so that the oil of each smooth appearance will enter directly without filtering. Therefore, pay attention to the hygiene of the oil when adding smooth oil; equip the necessary filtering machine; replace the smooth oil and filter element in time according to the application rules. If the fuel supply is too large, the incineration will not end, and the nozzle will leak; the fuel will enter the crankcase; together with some impurities, the fuel will enter the crankcase and the oil will mix together to reduce the smoothing effect. Therefore, the initiator should pay attention to the investigation of the initiator. Exhaust smoke and operating conditions; if there is an abnormality, it is necessary to check the cause in time to correct or replace it. Fourth, when the engine is assembled; the internal parts are poorly sanitized. When starting the machine; must pay attention to the hygiene of the parts; {HotTag} device should pay attention to avoid re-contamination; ensure the internal sanitation after the device.
No matter what kind of reason; it is necessary to replace the engine oil and the filter element after the removal of the fault. The repaired starter initiates an empty operation for two hours to stop the operation for inspection; there is no alloy powder in the oil; However, it is necessary to pay attention to the investigation at the beginning of the application; after 60 to 120 hours of operation, it is confirmed that the abnormal wear is completely removed; and the oil is replaced; the initiator can be put into normal use. If abnormal wear is continued, it is necessary Aborting the application for crash viewing and correction.
2. Damage to the bearing bush by larger particle foreign matter and residual smooth oil:
When large particles of alloy blocks or flakes are found in the oil filter element and the initiating oil sump; the shaft and the bearing bush have been severely damaged; it is necessary to stop the inspection and correction immediately; if it is continuously applied, it will constitute more parts damage. .
The reason for the entry of larger particles is that the parts are not cleaned when the device is installed; for example, the metal chips that occur when processing the inner hole of the connecting rod bushing remain in the oil passage of the connecting rod, the cutting or sand is stuck in the parts and the oil passage, and the cutting is not completely eliminated before the device Or the machining burrs of the machined parts associated with the moving surface are not removed, the foreign objects with larger particles adhered to the bearing bush or the outer surface of the shaft are damaged. These images are very serious damage to the bearing bush. So repair Carefully clean up and view the device.
The smoothing effect and heat dissipation of the residual smooth oil can not meet the demand; the bearing and the shaft wear are aggravated; the excessive temperature of the moving surface constitutes the melting and damage of the bearing of the bearing; the residual oil of the smoothing oil is more blocked by the oil filter. The smooth oil rich in impurities directly enters the moving surface without filtering; further accelerates the damage of the shaft and the bearing bush. Therefore, when purchasing and replacing the smooth oil, the quality of the smooth oil must be strictly controlled according to the rules; the smooth oil is selected according to the rules.
3. Damage to the shaft and bearing bush by moving foreign objects:
There is a large foreign object between the bearing bush and the inner wall of the hole of the tile device; the movement of the bearing bush will have a convex appearance; when the shaft is in operation; the abnormal wear will start from the convex point; and expand to the periphery; Early damage of the bearing bush, if there is a large foreign object between the moving surface of the bearing bush and the shaft; the device will be embedded in the alloy layer of the bearing bush after the device; the bearing shaft will also damage the bearing bush, the shaft and the tile and the device hole, etc. If the associated part has bumps and bumps, it will damage or damage the shaft and the tile.
Causes and avoidance of seizures: shafts, bushings, bushing holes (body, connecting rod) rusting oxides or sticking to sediment; carefully check the removal before the device; especially the oil passage and tubing cavity, the device site must be away from In places where dust is flying and debris is splashed, the equipment used should be clean and hygienic; and the necessary protection measures should be adopted; avoid re-contamination; the smooth oil used in the installation should be hygienic; avoid dust mixing, shafts and bushings and bushing holes. The registration and installation; to ensure that it does not touch any metal objects and must not have any touch operations.
Second, the cause of the smooth system constitutes the damage and damage of the shaft and bearing bush:
1. Damage and damage appearance caused by poor smooth action:
When the smoothing effect of the shaft and the bearing bush does not meet the demand; there will be various fault characteristics. For example, the oil pressure is low; some of the shaft and the bearing bush will cause damage and damage to the sports appearance due to the conflict of the direct touch. At the moment, the outer surface of the shaft is blue. If the smooth oil fails or the pressure cannot be built up; the appearance of the movement completely loses the protection of the oil film; the direct touch touches the dry conflict. The temperature rises the alloy layer of the bearing shell to melt; The appearance of "wa"; not stopping in time will constitute more severe damage to the parts.
Causes of the attack: the oil level is too low or the smooth oil passage breaks, the oil suction filter, oil passage, oil hole is blocked, the oil pump wears or the oil suction line leaks, the pressure regulating valve and the pressure limiting valve are damaged, and the starter idles If the time is too long, the high-speed operation and full-load operation will be directly performed without the warming operation after the start-up of the start-up machine. After the full-load operation, if the temperature is high, the operation will stop without the empty load in the low-speed operation; Heat buildup; temperature rise, no standard oil is selected according to the rules and the oil is replaced regularly.
2. There is water in the smooth oil; damage and damage to the shaft and bearing bush are formed:
The damage of the water in the smooth oil to the shaft and the bearing bush is more serious; because the water will make the smooth oil damper damage the oil film. The outer surface of the alloy layer of the bearing bush has a hole-like gray material at the margin of the conflict surface; and the black corrosion occurs on the alloy surface. The outer surface of the bearing alloy conflicts with irregular pits and some flakes.
Reasons for the seizure: the seal of the cylinder liner is poorly sealed; the coolant enters the crankcase, and the engine oil radiator is damaged; the oil and water are mixed, and when the smooth oil is added, there is water entering or the fuel filler port and the oil dipper are poorly sealed; the washing machine and the water when it is raining Entering the crankcase, there is water in the fuel entering the crankcase. So before each launch of the launching machine; must check the oil level and oil quality of the smooth oil; this is necessary.
3. Damage to the shaft and bearing bush caused by fuel in the smooth oil:
After the fuel enters the crankcase, it will make the smooth oil change. æ¹ã‘浔〗 The legs are å€ å€ å€ å²· å²· å²· 嵬咴 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The by-product of the incineration after fuel incineration; after being brought into the poorly ventilated crankcase by the fuel; the sulfuric acid produced will form a severe cavitation on the outer surface of the shaft.
The cause of the attack: the fuel supply of the fuel system is too large; the fuel injected into the incineration chamber cannot be completely incinerated, the intake air is blocked from the intake air amount; the fuel cannot be incinerated, the nozzle seal fails, the fuel enters the crankcase, and the fuel passage in the cylinder head There are blowholes or cracks in the pores, and the idling speed is too long; the temperature of the initiator is low and the fuel cannot be completely burned.
It is necessary to avoid damage and damage to the shaft and bearing bush caused by the smooth system:
A. In the absence of manual smoothing equipment; when the device is started, the movement of each shaft and bearing bush should be coated with the same sanitary smoothing oil as the operating label; after the machine is started; the fuel switch is closed before the initial launch; The starter of the movement starts to idle several times; when the engine oil pressure gauge is activated; the fuel switch is turned on again; the throttle is set at medium and low speed; the initiator is initiated to conduct the operation investigation.
B. After the start of the captain's temporary deposit; the initial launch will also be initiated after the launch of the machine shares;
C. It is necessary to protect, view, and replace the smoothing oil and filter element at the time of the rule.
D. Initiating the smooth oily surface of the machine; it is necessary to be within the specification scale; it is necessary to sanitize the smooth oil and refueling; avoid the entry of any dirt and water; together ensure the sealing effect of the various parts of the machine.
E. Avoid starting the machine idling work too long; idle work can not exceed 5 minutes.
F. It is necessary to pass the medium-speed heating operation after the initiation of the machine; when the water temperature rises above 70 °C, it is put into operation.
G. After the start of the full-load operation, the initiator can't stop immediately; it is necessary to let the initiator idle for 15 minutes after the idle speed is turned on; otherwise the internal heat will not be released.
Third, improper use of the damage and damage:
1. Damage and damage appearance caused by long idling operation time: the outer alloy layer of the bearing bush; being kneaded and displaced, flanging and flake off.
The reason is: the initiator idling is too long; the initiator is operating below the normal operating temperature; the fuel injected into the incineration chamber cannot be completely incinerated; some fuel that has not been incinerated flows into the crankcase along the cylinder wall; The smooth oil oil film drops smooth. The idling speed is low; the oil pump oil supply. The é©® é©® èŠåµ¬å‘¤èŠ°Î¡ç »å¬—胫岬 èŠåµ¬å‘¤èŠ°Î¡ç »å¬—胫岬 åµ› åµ› 赡Σ 赡Σ 赡Σ 赡Σ 皇 皇 皇 皇 皇 皇 皇 皇 皇 皇 皇 皇 皇 皇鹕 鹕 谒鹕 谒鹕 谒鹕 谒鹕 谒鹕 谒鹕 谒鹕 谒鹕 谒鹕 谒鹕 谒鹕 谒鹕 谒鹕 谒鹕 鸹 鸹 鸹 鸹 鸹 鸹 鸹 鸹 鸹 鸹 鸹 鸹 鸹 鸹 鸹 鸹 鸹 鸹 鸹 鸹 鸹 鸹 鸹 鸹 鸹 鸹 鸹 鸹 鸹No-load operation can not be less than 850 rpm.
2. Initiate the captain's damage and damage after stopping (shutdown) at the moment: the outer surface of the bearing alloy is worn; the uneven alloy is displaced from the center to both sides.
The reason is: the initiator is in a long time after heavy load operation; the internal parts are at the highest working temperature; in particular, some of the incinerators are at high temperature; after the start of the machine is suspended; the cooling system and the smooth system both stop the operation; Go out and raise the temperature of the associated parts; damage the oil film on each smooth surface; when re-initiating; when the oily surface of each smooth appearance is not yet formed; the abnormal wear of the bearing bush has already occurred. Especially for the supercharger The damage of the sliding bearing is more severe; the excessively high temperature will constitute the deformation of the shaft hole; the accuracy of the damage will accelerate the damage of the initiator. The appearance of this phenomenon will cause severe damage to the piston, cylinder liner and cylinder seal. After the starter has a large load operation for a long time; the initiator should be idle for more than 10 minutes at low speed; the internal temperature will drop again in the future.
3. After the initiator is initiated, it directly enters the high-speed operation and full-load operation to damage or damage the bearing bush: the seventh and sixth spindles of the initiator are severely worn; other bearing bushes are damaged.
The reason is: the no-load heating operation is not carried out after the initiator is initiated; the high-speed operation and the full-load operation are input. Because the initiator does not reach the working temperature requirement; the force touch surface and the working gap of each part do not enter the optimal condition; The low smooth oil has poor fluidity; the heat of each movement can not be agile by the smooth oil; it will constitute damage or damage to the bearing. The lower the outside temperature, the more severe the damage to the bearing. It is necessary to avoid the onset of such problems. The temperature rise operation is carried out according to the rules; the medium and low speed empty work is carried out after the initiation of the machine; when the water temperature of the starter rises above 70 °C, the operation is started.
4. The appearance of damage or damage to the bearing bush due to adjustment and operation errors: the crankshaft thrust bearing (thrust ring) is severely worn or damaged; the seventh spindle shoe is damaged.
The reason is: the axial clearance of the crankshaft is too large or too. The 蓟嵩 汕嶂 汕嶂 汕嶂 汕嶂 汕嶂 汕嶂 汕嶂 汕嶂 汕嶂 在 在 在 在 在 è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘Damage to the seven spindles. Avoid the onset of such problems; it is necessary to ensure that the axial clearance of the crankshaft is at a scale of 0.18 to 0.35 mm when the machine is started.
4. The appearance of improper damage to the bearing bush or damage caused by the device:
1. The single shaft wear on one side is severe; the wear of the tile alloy is external.
The reason is: the deformation of the connecting rod exceeds the specification to ensure the scale, the bushing cover bolt consolidation torque is not uniform, the single side of the bearing bush is damaged when the device is installed, the bearing position of the bearing bush is inaccurate and the upper and lower sides are not centered.
2. The seven-sided bearing bush wears severely on one side; the central bearing bush wears more severely than the two bearing bushes.
The reason is: the deformation of the bushing hole is tapered, and the crankshaft is bent. The reason for the crankshaft bending is that the working gap is uneven, the associated parts are severely worn or the oscillation of the damage occurs, and the balance damper fails. The balance damper failure can also constitute the crankshaft cracking. ), when the bearing device is positioned, some orientations are not aligned or reversed: the upper and lower tiles are not aligned with the oil hole.
3, the back of the bearing bush is corroded or has a slight moving wear scar, the bearing pad positioning table damages the bearing bush and walks irregularly.
The reason is: in order to correct the working space in the device; the double-sided side plane of the bearing bush is cut; the elastic touch force of the bearing bush and the shaft hole is damaged, the bearing cover is reversed; the touch area and the moving gap of the bearing bush and the shaft are changed, and the bearing cover is changed. When the bolts are tightened; they are not tightened according to the rules and torque. If the torque is too large or too small and the bolt tightening torque on the same tile cover is uneven, the bearing bush will be damaged.
Recommend to friends comments close window
| Bearing related knowledge |
How does the depiction of stainless steel deep groove ball bearings extend the life of industrial bearings?
Several kinds of things necessary for the bearing in operation. Bearing ferrule grinding super-processing new skills and development situation Analysis of common faults of sliding bearings
|
This article links to http://
Please indicate the bearing network http://
Previous:The bearing bush can work normally; it is closely related to the bearing alloy casting quality. Next: How to choose the bearing smooth oil
Mono Calcium Phosphate ,the chemical formula is Ca (H2PO4)2.H2O, molecular weight of the body is 252.06, after dryed the product is white or slightly yellow micro powder or granules, the relative density of 2.22 (16 °C). Slightly hygroscopic, soluble in hydrochloric acid, nitric acid, slightly soluble in cold water, almost insoluble in ethanol. At 30 °C, 100 ml of water soluble MCP 1.8g. The aqueous solution was acidic, heating the aqueous solution can get calcium hydrogen phosphate. Lose crystal water at 109 °C and decomposed into calcium metaphosphate at 203°C. Applications:Monocalcium Phosphate is used to supply mineral nutrition such as phosphorus (P) and calcium (Ca) for animal, which can be easily digested and absorbed. Extensively applied as additives of Phosphorous and Calcium in aquatic animals feed.Higher water solubility of MCP is required in aquatic animals feed.
Calcium Phosphate
Calcium Phosphate Supplement,Calcium Phosphate,Calcium Phosphate Powder,Dcp Chicken Feed
MIDI FEED BIOTECH LIMITED , https://www.chinabromine.com