| |
| |
 |
News information center |
|
Large role of small objects damaged seals on the impact of hydraulic equipment
|
| 发布时间：2010.04.29 新闻来源：Zhejiang Province Taizhou Aite Sealing Element Manufacture Co.,Itd. 浏览次数： |
| |
Machining industry, a wide range of hydraulic applications, such as lathes and other types of automatic hydraulic transmission. The course of these machines in use, the frequent, such as impact, creep and other faults, diagnostic maintenance, often in the hydraulic control elements (such as various types of pumps, valves) can not find fault Yuan Yin, Zhi Shi maintenance work into Kunjing. The ultimate failure of such components is often found in the implementation of the reasons that the cylinder piston seals caused by severe wear. Such phenomena especially "O" ring see more.
Example 1: a CB3463-1 semi-automatic program-controlled hexagonal turret lathe, in the course of the emergence of turret to adjust the feed rate can not be the fault phenomena, valve 2 closed still crawling, pediment, and until tank bottom to stop the machine unusable.
Inspection and Maintenance: Check all hydraulic control elements, in particular, speed components are not found any problems. Replacement of some of the speed control valve malfunction not been eliminated. After dismantling the cylinder was found after the piston "O" ring serious wear and tear, so that the two chamber hydraulic oil tank caused by channeling each other. Analysis of its causes, because "O" ring wear, the cylinder rod cavity and the expanded space of exchange Rod, when the closing speed control valve 3 or cut-off valve 2, is equivalent to cutting off a cylinder rod chamber Back to the asphalt.
In theory, the pressure oil into the cylinder without rod chamber, the thrust F piston to form a free, produce the piston rod cavity to move the trend, because the oil cylinder rod chamber back off, oil cavity rapid formation of back pressure, so that the piston ends of the balance of power and stationary, then there is F = F No, no oil pressure due to piston chamber size varies by force, that P has more than P-free. In practice, due to the formation of two cavities gap cylinder exchange, the oil pressure cylinder chamber with high pressure areas to low pressure areas from the trend of flow, flow of a generation, a lower chamber pressure P, P no increased role of the two piston No side thrust F is equal to F are, loss of balance piston cavity to the movement of rod looking for a new balance. Such a reciprocating, piston has been moved to a external block to stop. The phenomenon is brought to the machine's maintenance work had a great influence, the replacement cylinder piston "O" ring, the machine failure to eliminate running back to normal.
Example 2: a CE7120 hydraulic copying lathes, in work cited by the sword-line profiling tool carrier turn red vertical feed cutting knife, resulting in knife fight, spent living phenomenon frequently, and machine tool does not work.
Inspection and Maintenance: Check the hydraulic valve was no failure, maintenance of 1:00 into the blind spot. Vertical cylinder dismantling the knife and found the piston seal "O" ring has been polished cylindrical, also found that the size of the piston cylindrical sub-requirements (machine tools is a reason), the direction of less than the standard size of diameter 0.8mm, piston and cylinder body clearance was very big, two-chamber vertical cylinder exchange channeling oil. Maintenance, replacement of the piston as well as qualified "O" ring impulse after the machine tool troubleshooting.
Analysis of the reasons cited by the sword in the profiling tool line in place of the moment, the whole knife by a momentum F ', after the decomposition of the force has a horizontal force acting on the vertical cylinder piston rod F'1, the same time, the electromagnetic Valve 34E1-25B work, vertical cylinder rod connected to the pressure oil chamber, no rod connected to control valve chamber back circuit, the piston rod chamber by the force F by the two completed, one for F'1, the other is F1 = A1P1, where A1 is the force-free rod cavity area, then F = F'1 + F1. Normally, the piston under the action of F in the force began to move with rod cavity, due to incompressibility of hydraulic oil, hydraulic oil pressure chamber rodless abrupt increase in the formation of back pressure to the piston, the piston valve by the force balance by Speed fixed adjust the cutting speed steady. The moment due to the role of% F'1, vertical cylinder cavity pressure P2 will be greater than P1. In practice, fuel tanks for space channeling through the two cavities, the moment in P2 than P1, hydraulic oil and high pressure areas have no shot from the area of low pressure chamber to the trend of the rod cavity flow, flow, once, P2 decreased, P1 increased F1 increases, loss of balance force the piston, piston driven turret quickly move to the non-rod cavity. The moment after the end down by profiling tool, role in the level of vertical cylinder piston thrust F'1 go away, quickly moving the piston end of the cutting tool holder has stabilized, ending the phenomenon of red knife.
The above two cases of troubleshooting method has been proved many times in practice, maintenance of good results.
|
| |
|
|
|
|
|
