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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>Revision of hydraulic excavator reverse bearing Correction of reverse rotation support of hydraulic excavator
1 Fault image and cause analysis A Sumitomo S2800FJ hydraulic excavator has been operating 8664h. In a construction site; the dump truck crashed into the counterweight of the excavator. Later it was found that many of the sealing equipment from the reverse support Butter; there is an abnormal movement inside the reversing support; when reversing; every turn to the front and left side of the machine; the reversing support announces the creaking sound. Use the bucket to support the ground; make the crawler off the ground; Put down; find that the axial clearance of the reverse bearing is larger. Then use the bottom of the bucket to land; make the stick extend; find that the reverse bearing has the same large radial gap. Reverse motor and reverse speed reducer Normal. Therefore, the preliminary judgment is that the steel ball and the barrier sleeve inside the reverse support are damaged; the axial and radial clearance of the reverse support are increased; the sealing device can be damaged. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
The reverse bearing is collapsed. The outer race of the reverse bearing is connected with the upper car. The inner race is connected with the lower car. All the oil pipes on the reverse motor are removed; and the head of the oil pipe is made of clean plastic. The film is sealed. Use the crane to lift the car quietly; then loosen the outer ring bolts of the reverse support; and remove them all; separate the upper and lower cars. ã„— (14) é¦ ç¯ ç¯ ç¯ åˆˆ è…¥ è…¥ è…¥ è…¥Rudi å—”. As shown in Figure 1; the taper pin 2 is driven out; then the plug 3 is taken out with a screw; then the steel ball and the barrier sleeve are taken out by the wire. The steel ball and the barrier sleeve are all taken out; only two of the barrier sleeves are found. It can be seen that the original shape; the other is squeezed into pieces. The steel ball is cleaned with diesel; more than 30 steel balls have severe pits and significant deformation; others have different degrees of pitting. After the ring is removed; the butter on the inner and outer raceways is cleaned; the inner and outer raceways are front and left (the machine is moving forward). The pitting can be clearly seen in daylight.
When the excavator is hit; it is equivalent to applying a very large impact force in the radial direction of the reverse bearing; causing some of the barrier sleeves in the reverse bearing to be damaged (the barrier sleeve is as shown in Figure 2; the material is nylon; soft) If the operation continues, the damage of the barrier sleeve will be more and more; the gap between the inner and outer races will be increased; the butter will be pulled out from the gap between the inner and outer races; the raceway, the barrier sleeve and the steel ball will not be obtained. Smooth; then accentuate the damage of the raceway, the barrier sleeve and the steel ball; form an abnormal sound and a stuck appearance when the excavator reverses. 2 Correction of the reverse support and equipment 2. 1 Correction of the reverse support if replaced with a new one Reverse bearing demand import; and expensive; about 100,000 yuan; delivery cycle is also longer. The excavator itself is an old machine; there is no need to replace the new reversing bearing; so the resolution corrects the original reversing support. The problem is found to be timely; the damage of the inner and outer raceways of the reverse bearing is not very serious. After investigation and measurement; the inner and outer raceways of the reverse support are deformed; only the raceway has pitting; it is still sustainable. Adopt replacement barrier The method of steel ball and sealing equipment is corrected. The original inverted bearing steel ball has a diameter of 28.48 mm; while the domestic product can only buy a steel ball with a diameter of 28.60 mm; it is larger than the diameter of the original steel ball. 0. 12mm. There are a total of 136 barrier sleeves and steel balls in the original reverse bearing. The length of the steel ball and the barrier sleeve in the raceway is 16.32 (136×0. 12) longer than the original; the scale of each barrier sleeve should be corresponding. Reduce the thickness of 0. 12mm; to ensure that the inner sleeve and the steel ball of the reverse support are just filled with the raceway. The optional method is adopted when purchasing the steel ball; it is necessary to ensure that the diameter of the steel ball is less than 0. 002mm. These are used for equipment. If they are installed, they will not be guaranteed to be the same as the original ones; the dimensions of some barrier sleeves should be reduced; until the number of the original reverse-reverse support sleeves and steel balls is the same and the entire raceway stops.
2.2 The equipment of the reverse support is the first; the inner and outer races (including the raceway); the steel ball; the barrier sleeve; the sealing equipment and the bolt holes are cleaned and cleaned; and the outer race is placed on the inner race. Basically; basically ensure that the raceways of the inner and outer races are on the same plane; then put the steel ball and the barrier sleeve into the raceway through the radial holes (as shown in Figure 1); the order is a steel ball and a barrier sleeve Until it is full; then block 3; tighten the cone pin 2. When the equipment is sealed; apply some sealant to the sealing device and the sealing groove; to ensure the sealing effect. Change the reverse bearing; see if there is Clamp the appearance; if there is a clamping image, it should be repaired; make it sensitive to change. Finally, refill the butter ring of the outer race to fill the butter; fill the raceway with butter; and reverse the pinion and reverse The large oil tank is filled with butter.
Lift the upper part of the excavator with a crane; align the lower end of the reverse channel with the outer seat of the reverse support; after alignment; use the round steel near the diameter of the bolt to get on and off the bolt hole Correct positioning; then equipment bolts; bolts should be coated with Loctite anti-slipping rubber. The bolts are triangular symmetrical equipment as shown in Figure 3. First equipment first group 3 bolts. Then equipment second group 3 bolts. The bolts cannot be tightened; after all the bolts are finished, the bolts are tightened one by one with a torque wrench; the tightening torque is 650 N?m. The equipment is over; the engine is replaced by various measures; until the recovery stops normally.
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Source: China Bearing Network Time: 2014-03-29