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Causes of oil leakage in hydraulic cylinders of excavators and precautions for use
Friends engaged in construction machinery must be often troubled by the oil leakage of the hydraulic cylinder. For excavators, once the hydraulic cylinder leaks, there will be slow lifting and insufficient digging force. So what are the causes of oil leakage in the hydraulic cylinder of the excavator? What should we pay attention to when using excavators to avoid oil leakage in hydraulic cylinders?
Friends engaged in construction machinery must be often troubled by the oil leakage of the hydraulic cylinder. For excavators, once the hydraulic cylinder leaks, there will be slow lifting and insufficient digging force. So what are the causes of oil leakage in the hydraulic cylinder of the excavator? What should we pay attention to when using excavators to avoid oil leakage in hydraulic cylinders?
Under normal circumstances, the leakage of hydraulic cylinders is divided into internal leakage and external leakage. As long as we observe carefully, we can determine the cause of external leakage. It is more difficult to determine the cause of the internal leakage of the hydraulic cylinder, because we cannot directly observe the internal leakage.
Then, let’s briefly talk about the internal leakage and external leakage of the hydraulic cylinder.
One, external leakage.
1, the sealing damage between the extension end of the piston rod and the piston rod is mostly caused by the roughening of the piston cylinder, and it is also caused by aging.
2. The seal between the extension end of the piston rod and the cylinder liner is damaged. This is mostly caused by the long-term use of the seal and the aging of the seal. Many of the seals are damaged by excessive force when the upper end cover is pressed. There are many domestic production hydraulic cylinders. The manufacturer's design is unreasonable. In most cases, the manufacturer is to save costs.
3, the crack of the oil cylinder inlet and outlet pipe joints will also cause the hydraulic oil cylinder to leak.
4, oil leakage caused by defects on the cylinder block or cylinder end cover.
5, the piston rod is strained and has grooves, pits, etc.
6, the deterioration of lubricating oil makes the temperature of the oil cylinder rise abnormally, which promotes the aging of the sealing ring.
7, oil leakage caused by often exceeding the pressure range of the cylinder.
Second, internal leakage.
1, the wear ring on the piston is severely worn, causing friction between the piston and the cylinder liner, and finally straining the cylinder liner, piston and seal.
2, the seal fails for a long time, and the piston seal (mostly U, V, Y ring, etc.) is aging.
3, the hydraulic oil is dirty, and a large amount of impurities enter the oil cylinder and wear the piston seal to the point, which is usually iron filings or other foreign matter.
Through the brief introduction above, we can find that, in addition to the aging caused by long-term use of the oil seal, as long as we pay attention to maintenance during normal work, the problem of oil leakage in the hydraulic cylinder can be avoided. So what do we need to pay attention to when working with excavators? Let's also briefly talk about it below.
Precautions for the use of hydraulic cylinders.
After knowing the cause of the oil leakage in the hydraulic cylinder, the problem arises. What problems should we pay attention to when using the hydraulic cylinder? Next, let's talk about the precautions for the use of hydraulic cylinders.
1. In normal use, we must pay attention to protecting the outer surface of the piston rod to prevent bumps and scratches from damaging the seals. Nowadays, some construction machinery cylinders will be designed with protective plates. Although there are, we still need to pay attention to prevent bumps and Scratched. In addition, I also need to clean up the mud and sand on the cylinder dynamic seal dust ring and the exposed piston rod frequently to prevent the difficult-to-clean dirt stuck on the surface of the piston rod from entering the cylinder, causing pistons, cylinders or seals damage.
2. In normal use, we should also pay attention to frequently check the connections of the threads, bolts, etc., and tighten them immediately if they are loose. Because these places are loose, it will also cause oil leakage in the hydraulic cylinder, which is well understood for those engaged in construction machinery.
3, we need to pay attention to the frequent lubrication of the joints to prevent rust or abnormal wear in the absence of oil. Especially for some parts with rust phenomenon, we should deal with it in time to avoid oil leakage of hydraulic cylinder due to rust.
4, during normal maintenance, we should pay attention to regular replacement of hydraulic oil, timely cleaning the system filter to ensure the cleanliness of the hydraulic oil, which is also very important for prolonging the service life of the hydraulic cylinder.
5, in normal work, we must pay attention to control the system temperature, because too high oil temperature will reduce the service life of the seals, and long-term high oil temperature will cause permanent deformation of the seals, and in severe cases, the seals will fail.
6, we usually have to perform a trial run of full extension and full contraction for 3-5 strokes before we start work every time we use it. The purpose of this is to exhaust the air in the system and preheat the systems, so as to effectively avoid the presence of air or water in the system, causing gas explosions in the cylinder body, which will damage the seals and cause leakage in the cylinder, etc. malfunction.
7, after each work is completed, we need to pay attention to keeping the arms and buckets in an optimal state, that is, to ensure that the hydraulic oil in the hydraulic cylinder is returned to the hydraulic tank to ensure that the hydraulic cylinder is not under pressure. Because the hydraulic cylinder bears pressure in one direction for a long time, it will also cause damage to the seal.
In fact, I believe that friends in the construction machinery industry still have many suggestions for the use of hydraulic cylinders. The author only lists a few of them. It may be a bit simple in the eyes of senior practitioners, and I hope that many friends Put forward your valuable opinions.
Summary: The hydraulic cylinder is a very important part of the hydraulic system. Once the hydraulic cylinder leaks, it will cause the machine to lift slowly and excavate weakly, which will seriously affect the work efficiency. In this society where time is money, I believe this is something that many friends do not want to see. Then please be kind to your hydraulic cylinder!
【Statement】
Disclaimer: The above article is partly reprinted from the web editor. The purpose of reprinting is to convey more information. If it involves the content of the work, copyright and other issues, please contact us in time. We will take appropriate measures as soon as possible to avoid causing both parties Unnecessary economic losses.
Under normal circumstances, the leakage of hydraulic cylinders is divided into internal leakage and external leakage. As long as we observe carefully, we can determine the cause of external leakage. It is more difficult to determine the cause of the internal leakage of the hydraulic cylinder, because we cannot directly observe the internal leakage.
Then, let’s briefly talk about the internal leakage and external leakage of the hydraulic cylinder.
One, external leakage.
1, the sealing damage between the extension end of the piston rod and the piston rod is mostly caused by the roughening of the piston cylinder, and it is also caused by aging.
2. The seal between the extension end of the piston rod and the cylinder liner is damaged. This is mostly caused by the long-term use of the seal and the aging of the seal. Many of the seals are damaged by excessive force when the upper end cover is pressed. There are many domestic production hydraulic cylinders. The manufacturer's design is unreasonable. In most cases, the manufacturer is to save costs.
3, the crack of the oil cylinder inlet and outlet pipe joints will also cause the hydraulic oil cylinder to leak.
4, oil leakage caused by defects on the cylinder block or cylinder end cover.
5, the piston rod is strained and has grooves, pits, etc.
6, the deterioration of lubricating oil makes the temperature of the oil cylinder rise abnormally, which promotes the aging of the sealing ring.
7, oil leakage caused by often exceeding the pressure range of the cylinder.
Second, internal leakage.
1, the wear ring on the piston is severely worn, causing friction between the piston and the cylinder liner, and finally straining the cylinder liner, piston and seal.
2, the seal fails for a long time, and the piston seal (mostly U, V, Y ring, etc.) is aging.
3, the hydraulic oil is dirty, and a large amount of impurities enter the oil cylinder and wear the piston seal to the point, which is usually iron filings or other foreign matter.
Through the brief introduction above, we can find that, in addition to the aging caused by long-term use of the oil seal, as long as we pay attention to maintenance during normal work, the problem of oil leakage in the hydraulic cylinder can be avoided. So what do we need to pay attention to when working with excavators? Let's also briefly talk about it below.
Precautions for the use of hydraulic cylinders.
After knowing the cause of the oil leakage in the hydraulic cylinder, the problem arises. What problems should we pay attention to when using the hydraulic cylinder? Next, let's talk about the precautions for the use of hydraulic cylinders.
1. In normal use, we must pay attention to protecting the outer surface of the piston rod to prevent bumps and scratches from damaging the seals. Nowadays, some construction machinery cylinders will be designed with protective plates. Although there are, we still need to pay attention to prevent bumps and Scratched. In addition, I also need to clean up the mud and sand on the cylinder dynamic seal dust ring and the exposed piston rod frequently to prevent the difficult-to-clean dirt stuck on the surface of the piston rod from entering the cylinder, causing pistons, cylinders or seals damage.
2. In normal use, we should also pay attention to frequently check the connections of the threads, bolts, etc., and tighten them immediately if they are loose. Because these places are loose, it will also cause oil leakage in the hydraulic cylinder, which is well understood for those engaged in construction machinery.
3, we need to pay attention to the frequent lubrication of the joints to prevent rust or abnormal wear in the absence of oil. Especially for some parts with rust phenomenon, we should deal with it in time to avoid oil leakage of hydraulic cylinder due to rust.
4, during normal maintenance, we should pay attention to regular replacement of hydraulic oil, timely cleaning the system filter to ensure the cleanliness of the hydraulic oil, which is also very important for prolonging the service life of the hydraulic cylinder.
5, in normal work, we must pay attention to control the system temperature, because too high oil temperature will reduce the service life of the seals, and long-term high oil temperature will cause permanent deformation of the seals, and in severe cases, the seals will fail.
6, we usually have to perform a trial run of full extension and full contraction for 3-5 strokes before we start work every time we use it. The purpose of this is to exhaust the air in the system and preheat the systems, so as to effectively avoid the presence of air or water in the system, causing gas explosions in the cylinder body, which will damage the seals and cause leakage in the cylinder, etc. malfunction.
7, after each work is completed, we need to pay attention to keeping the arms and buckets in an optimal state, that is, to ensure that the hydraulic oil in the hydraulic cylinder is returned to the hydraulic tank to ensure that the hydraulic cylinder is not under pressure. Because the hydraulic cylinder bears pressure in one direction for a long time, it will also cause damage to the seal.
In fact, I believe that friends in the construction machinery industry still have many suggestions for the use of hydraulic cylinders. The author only lists a few of them. It may be a bit simple in the eyes of senior practitioners, and I hope that many friends Put forward your valuable opinions.
Summary: The hydraulic cylinder is a very important part of the hydraulic system. Once the hydraulic cylinder leaks, it will cause the machine to lift slowly and excavate weakly, which will seriously affect the work efficiency. In this society where time is money, I believe this is something that many friends do not want to see. Then please be kind to your hydraulic cylinder!
【Statement】
Disclaimer: The above article is partly reprinted from the web editor. The purpose of reprinting is to convey more information. If it involves the content of the work, copyright and other issues, please contact us in time. We will take appropriate measures as soon as possible to avoid causing both parties Unnecessary economic losses.
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