From the perspective of steel enterprises, rolling steel occupies a very important position. At present, the level of products is constantly improving and gradually tending towards automation, and the control accuracy has also been greatly improved, which further establishes the important position of technology in hydraulic equipment for steel rolling. Hydraulic systems are included in steel rolling equipment, which mainly have the following characteristics:
(1) The distribution of hydraulic pump stations is relatively concentrated, while the distribution of control valves is relatively scattered, operating through complex actuators.
(2) The pressure and flow rate within the system are high.
(3) High operating frequency and short response time.
(4) Many high-precision control valves have been used.
(5) Complex structure and numerous components.
(6) The working environment is greatly influenced by external factors and the conditions are very strict.
(7) The hydraulic system can operate for a long time.
Based on the above characteristics, we found that hydraulic system failures are common, and these failures are generally difficult to detect and eliminate. Although these faults are difficult to eliminate, their existence will inevitably hinder the normal operation of the hydraulic system and cause certain harm to the environment, resulting in an unjustified increase in rolling costs. It can be seen that for steel rolling equipment, certain measures must be taken to effectively prevent the occurrence of hydraulic leakage problems.
1. Analysis of the causes of leakage
Throughout the entire hydraulic system, hydraulic oil first comes out of the tank and then goes through various stages for use, so there is a possibility of system leakage at every stage. For a steel rolling equipment, there are many reasons that can cause hydraulic system leakage, which can be summarized as follows.
(1) Plate movement and impact. The transmission power of the hydraulic system is relatively large, and the response speed is relatively fast, which may bring about significant impact force, causing components to loosen, which can lead to leakage problems in the hydraulic system.
(2) The seal is damaged. The selection and assembly of seals are unreasonable, and the size of the grooves is inappropriate, which can cause certain damage to the seals and lead to leakage in the hydraulic system. In addition, if the sealing components age or wear out due to prolonged use, it may lead to system leakage.
(3) High temperature. During the operation of hot rolling equipment, it is difficult to avoid radiation, and a large amount of heat is generated during the operation, ultimately leading to a continuous rise in system temperature to high temperatures. The system leakage caused by high temperature is mainly manifested through the following ways: ① Due to the high temperature, the viscosity of hydraulic oil begins to decrease, which leads to the appearance of many gaps and causes leakage. ② Non metallic seals gradually age due to the influence of high temperatures, causing damage to the sealing structure and leading to leakage problems. ③ Hydraulic oil deteriorates due to high temperature, gradually losing its lubricating performance, which leads to the occurrence of wear and tear on the site, thereby causing leakage problems. ④ The hydraulic components expand excessively due to high temperature, which hinders the normal operation of the valve core and leads to leakage problems.
(4) The gap becomes larger. The joint surface is usually sealed, but if this gap is worn out, it will gradually become larger, ultimately leading to leakage problems.
(5) Impurity contamination. Impurities can also cause wear and tear problems, and may also affect the normal operation of the valve core, which are the main causes of leakage problems.
2. Main measures for controlling leaks
Overall, the effective prevention and control of hydraulic system leaks is a long and arduous task, and the system is highly systematic, requiring protection from various aspects such as design, structure, and commissioning. In terms of equipment usage and maintenance, the leakage problem can be solved by the following measures: (1) reducing the frequency of vibration and impact. Vibration and impact are not uncommon during equipment operation, and they pose significant hazards to the equipment. Therefore, it is necessary to take reasonable measures to reduce this damage. The main method is to install the hydraulic pump properly and minimize the impact force as much as possible. ② Install damping devices to minimize the destructive force of reversing impact as much as possible. ③ Install equipment to absorb impacts and reduce their damage. ④ Increase the utilization rate of pipe clamps to significantly enhance the anti vibration capability of hydraulic systems. ⑤ Minimize the occurrence of resonance phenomena as much as possible.
(2) Select appropriate sealing components and create a perfect sealing structure. Mainly selected from the following aspects: ① Equipped with interference tolerance and automatic compensation function. ② Wear resistant, corrosion-resistant, and able to withstand high temperatures, not easily aged. ③ The institution is easy to install and use, and strives to ensure its integrity as much as possible.
(3) Reasonably control the working oil temperature. For hydraulic systems, mineral oil is generally used as the working medium, so it is generally controlled between 35 ℃ and 45 ℃, at which point the working effect is optimal. In addition, it is not only necessary to control the oil temperature but also to control the oil rise, which can be achieved through the following methods: ① Control the heat source, coordinate the pressure between them, and reduce the probability of overflow and flow heat phenomenon. ② Use bypass circulation to reduce oil temperature.
(4) Select high-quality hydraulic oil. When choosing hydraulic oil, the following aspects should be considered: ① having good viscosity and viscosity temperature properties. ② Good lubrication performance and strong oil film strength. ③ Good chemical stability. ④ Outstanding rust resistance performance. ⑤ Does not affect the use of sealing materials. ⑥ The ignition point is relatively high.
(5) Ensure that the system is not contaminated and meets certain cleanliness requirements. ① When replacing components, be careful not to be contaminated by the external environment. ② Continuously expanding the filtration area and using a combination of multiple filtration methods to treat the filtrate. ③ Filter the new oil several times to meet certain standards before adding it to the fuel tank. ④ Timely and effectively handle worn components.
(6) Carry out maintenance work on the hydraulic system: ① Regularly check the connection of the firmware to avoid loosening problems. ② Replace the seals according to a certain cycle. ③ Replace the filter element at regular intervals and effectively inspect the quality of the oil to ensure its good quality.
(7) Comprehensively improve the comprehensive quality of management and maintenance personnel. Ensure that the quality of maintenance and repair meets the requirements: ① Cultivate specialized engineering and technical personnel and manage equipment through them. ② Strengthen the professional technical literacy of the staff and use them to maintain the hydraulic system. ③ Continuously strengthen training and education, comprehensively improve the ability of maintenance personnel to prevent and handle accidents. ④ Strengthen daily training work and enhance their business capabilities.
3. Conclusion
At present, leakage problems in hydraulic systems are a very common phenomenon and difficult to control. Especially for steel rolling enterprises, it is even more difficult because the hydraulic system is very complex, and the professional knowledge and skills of the technical personnel are insufficient, which cannot meet the needs of solving leakage problems. However, enterprises still need to give sufficient attention, develop reasonable and effective solutions, and control the development of leakage problems as much as possible, in order to provide the possibility of completely and effectively solving this problem.
2026 September 3rd Week VAFEM Product Recommendation
A linear-motion bearing or linear slide is a bearing designed to provide free motion in one direction. There are many different types of linear motion bearings. Motorized linear slides such as machine slides, X-Y tables, roller tables and some dovetail slides are bearings moved by drive mechanisms. Not all linear slides are motorized, and non-motorized dovetail slides, ball bearing slides and roller slides provide low-friction linear movement for equipment powered by inertia or by hand. All linear slides provide linear motion based on bearings, whether they are ball bearings, dovetail bearings, linear roller bearings, magnetic or fluid bearings. X-Y tables, linear stages, machine slides and other advanced slides use linear motion bearings to provide movement along both X and Y multiple axis.
2026-09-24