The best working temperature of hydraulic oil under the action of the transmission system is 35~60% ℃. In the process of using hydraulic equipment, once pressure loss, mechanical loss, etc. occur, it is very easy to cause the oil temperature of the hydraulic equipment to rise sharply in a short period of time, thereby affecting the stability of the mechanical movement of the hydraulic equipment. And even causing damage to the hydraulic components. Conducive to the safe operation of the hydraulic system.
This article will introduce the hazards, causes, and solutions of excessive oil temperature in hydraulic press machines. Hope it can help our hydraulic press customers.
1. The Danger of High Oil Temperature in Hydraulic Equipment
The hydraulic oil itself has good lubricity and wear resistance characteristics. When the hydraulic oil temperature environment is not lower than 35°C and not higher than 50°C, the hydraulic presses can maintain the best working condition. Once the oil temperature of the hydraulic equipment is too high or even exceeds the defined index, it will easily cause the internal disorder of the hydraulic system, accelerate the aging of the sealing parts of the hydraulic equipment, reduce the volume range of the pump body, and reduce the normal working capacity of the hydraulic system as a whole. Excessive oil temperature of hydraulic equipment can easily cause various equipment failures. If the overflow valve is damaged, the hydraulic equipment cannot be unloaded correctly, and the overflow valve needs to be replaced to solve the problem.
If the performance of the valve is reduced, it will easily lead to adverse phenomena in the hydraulic equipment, including equipment vibration, equipment heating, etc., which will seriously affect the performance of the hydraulic equipment. If the pumps, motors, cylinders, and other components of the hydraulic equipment are severely worn, if they are not replaced in time, the operation requirements of the hydraulic equipment cannot be met.
In addition, if the oil temperature of hydraulic equipment is too high, it will easily lead to problems such as the excessive load of hydraulic pump or insufficient oil supply, which will adversely affect the normal operation of the hydraulic system.
2. Analysis of the Reasons for the High Oil Temperature of Hydraulic Press
2.1 Insufficient rationality of hydraulic circuit structure and system architecture design
In the operation of the hydraulic system, unreasonable selection of internal components, insufficient tightness of pipeline arrangement design and lack of system unloading circuit are all important factors leading to excessive oil temperature.
When the hydraulic equipment is in operation, the flow rate of the oil in the valve is too high, resulting in high pressure during the operation of the equipment, and the flow of the hydraulic pump cannot be effectively controlled. In this case, it is very easy to cause the oil temperature of the hydraulic equipment to be too high. As far as the pipeline arrangement design is concerned, its complexity is relatively high. If the cross-section of the pipe material changes, it will inevitably affect the effect of the pipe diameter joint. When the oil flows through, the pressure loss under the action of the resistance effect is relatively large, which leads to a strong temperature rise reaction in the later stage of the hydraulic system.
2.2 Improper selection of oil products, insufficient equipment overhaul, and maintenance
First, the viscosity of the oil is not reasonable enough, and the internal wear and tear failure phenomenon is serious. Second, the system is extended, and the pipeline has not been cleaned and maintained for a long time. All kinds of pollution and impurities will increase the oil flow resistance, and the energy consumption in the later stage will be large. Third, the environmental conditions at the construction site are quite harsh. Especially on the basis of an extensive increase in mechanical operation time, various impurities will be mixed into the oil. The hydraulic oil subjected to pollution and erosion will directly enter the connecting position of the motor and valve structure, destroying the surface precision of the components and causing leakage.
During the operation of the system, if the internal oil volume is insufficient, the system cannot consume this part of heat. In addition, under the interweaving influence of various dry oils and dust, the carrying capacity of the filter element is insufficient. These are the reasons for exacerbating the rise in oil temperature.
3. Control Measures for Excessive Oil Temperature of Hydraulic Equipment
3.1 Improvement of the hydraulic circuit structure
In order to solve the problem of high oil temperature in hydraulic equipment, the hydraulic circuit structure improvement work should be fully done during the operation of the hydraulic system. Improve the structural accuracy of the system, ensure the rationality of the internal parameters of the hydraulic circuit, and promote the continuous optimization of structural performance to meet the operating needs of hydraulic equipment.
In the process of improving the hydraulic circuit structure, the accuracy of the system structure improvement should be ensured. Lubricate the clearance parts of the thinning parts to comprehensively improve the integrity of the thinning parts to ensure the reliability of the system structure. It should be noted that in the process of structural improvement of hydraulic circuits, relevant technical personnel should have applicability in the selection of structural improvement materials. It is best to use materials with a relatively small friction coefficient and adjust the thermal energy conditions of the oil cylinder in time to avoid affecting the contact accuracy of the system guide rail.
Technicians should use the balance force support effect to improve the heat accumulation reaction in the improvement of the hydraulic circuit structure. Under long-term operating conditions of machinery, contact and wear will cause heat accumulation. With the improvement of the supporting effect of the balance force, this kind of accumulation can be effectively reduced and the operating efficiency of the system can be improved. Scientifically control the problem of excessive oil temperature of hydraulic equipment fundamentally.
3.2 Scientifically set the internal pipeline structure of the system
In the operation of the hydraulic system, the setting of the internal pipeline structure is an effective strategy to control the problem of excessive oil temperature in hydraulic equipment. It can reduce the probability of deviation and enhance the overall coordination performance of the hydraulic system. Therefore, relevant technical personnel should do a good job in the internal pipeline structure of the system and control the overall pipeline length. Make sure that the angle of the pipe elbow is appropriate to ensure the rationality of the system management design.
On the basis of accurately grasping the characteristics of the established pipelines in the system, an integrated management system is established. Standardize the connection of the details, and then scientifically limit the flow rate inside the system. Avoid excessive oil temperature of hydraulic equipment to the greatest extent.
3.3 Scientific selection of oil materials
During the operation of hydraulic equipment, once the properties of the oil material are not suitable, it is easy to cause the problem of excessive oil temperature, which will adversely affect the normal use of hydraulic equipment. Therefore, if you want to scientifically control the problem of high oil temperature in hydraulic equipment, you should choose oil materials scientifically.
In addition, oil changes should be done regularly during the operation of the hydraulic system. Generally, the operating cycle is 1000 hours. After the system runs for a week, the oil should be changed in time. Technicians should pay attention to draining the old oil in the oil tank when changing the oil. And do a good job of adjusting the oil volume to ensure that the oil inside the hydraulic system is cooled in a standardized cycle. Then scientifically control the problem of excessive oil temperature of hydraulic equipment.
3.4 Carry out equipment overhaul and maintenance on time
During the operation of hydraulic equipment, in order to effectively control the excessive oil temperature, equipment repair, and maintenance should be carried out in time. Strictly and carefully check the sealing conditions of the oil inlet pipe of the system, and do maintenance work on time. Resolutely do not allow outside air to pour into the sleeve position.
At the same time, after changing the oil in the hydraulic system, the air inside the system should be exhausted in time to avoid affecting the performance of the hydraulic equipment. If the long-term worn parts are not repaired and maintained in time, it is easy to cause the oil temperature of the hydraulic equipment to be too high. Therefore, in the equipment maintenance and maintenance work, relevant technical personnel should start with the system operating standards and working conditions. Carry out comprehensive overhaul and maintenance for hydraulic pumps that have been in continuous operation for about 2 years. If necessary, replace the parts in time to avoid excessive wear of the hydraulic pump equipment and cause the oil temperature of the hydraulic equipment to be too high.
To sum up, the high oil temperature of hydraulic equipment is an important factor affecting the performance of hydraulic equipment. Once the control is not in place, it will affect the service life of the hydraulic press machines and even pose a great safety hazard. Therefore, in the use of hydraulic presses, the problem of excessive oil temperature should be strictly controlled. Ensure that the performance of each process, equipment, and component meets the relevant standards for hydraulic equipment operation. And do a good job in the inspection and maintenance of hydraulic system equipment in a timely manner. Deal with the problem as soon as it is found, so as to effectively control the oil temperature of the hydraulic equipment and ensure the safe and stable operation of the hydraulic system.
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Post time: Aug-17-2023
