The purpose of classifying hydraulic press equipment is to help people clarify their differences, so as to distinguish between different situations in the process of fault analysis, and to adopt the most appropriate methods and methods to achieve more ideal work results. Here, hydraulic equipment is classified from different perspectives.
(1) According to the control method classification. According to the control method, hydraulic press equipment can be divided into three categories: electric control, machine control and manual control. Electronically controlled hydraulic press equipment uses electromagnets to manipulate the relevant reversing valve to achieve its control purpose. This is the main hydraulic press equipment. Electronically controlled hydraulic presses mostly use standard hydraulic components, which are more convenient for assembly and disassembly, and for storage of spare parts, which is more beneficial to failure analysis. The inconvenience is that the composition of the electronically controlled hydraulic equipment is relatively complicated, and the electro-hydraulic systems are intertwined and interact with each other, making it easier to malfunction. In this type of system, the transmission process of control information is relatively long, it has to go through multiple links, and there are more inspections during fault analysis.
The control information of the machine-controlled hydraulic equipment is taken from the movement of the mechanism. Machine-controlled hydraulic devices are mostly used on various machine tools. For example, the hydraulic systems of lathes and planers control the direction of movement through the stroke limit mechanism. The working pressure and transmission power of machine-controlled hydraulic equipment are relatively low, the operating environment is relatively good, and the wear rate is relatively slow. There are many non-standard parts on machine-controlled hydraulic equipment, and the mechanical structure of non-standard parts is more complicated. There are many holes and slots on the parts. The functions of these holes and slots are represented by mechanical drawings, which is very inconvenient to read. The piping system of the hydraulic system of this type of equipment is complicated and difficult to clean up in a short period of time. The above reasons make failure analysis more difficult.
The control information of manual hydraulic equipment comes from the operator. Most of the hydraulic systems of various construction machinery belong to this category. The operating environment of hand-controlled hydraulic equipment is relatively poor, and the wear rate of the components is fast. Construction machinery mostly works in the field, and the detection methods are not as good as indoors. The operating conditions of this type of equipment vary greatly, and it is difficult to compare each other.
(2) According to the scale of equipment. According to the scale of equipment, hydraulic equipment can be divided into large equipment, medium equipment and small equipment. Although it is difficult to define the boundaries of equipment models, the relative difference in equipment scale is obvious. Large-scale equipment is difficult to assemble and disassemble due to its complex structure, large weight and volume. It is the focus and difficulty of diagnosis and monitoring, and it is also the main focus of on-site engineering and technical personnel. The fault diagnosis and elimination of this kind of equipment often requires a certain amount of manpower to investigate clearly in advance, and draw up a reasonable work plan, so that the project can proceed smoothly and reduce the consumption of various resources as much as possible.
(3) Classification according to the degree of precision of the equipment According to the degree of precision, hydraulic equipment can be divided into precision equipment and ordinary equipment. Precision equipment undertakes more precise tasks. The hydraulic components that it constitutes are technologically advanced, and the accuracy is correspondingly high. Servo components are often used, and the testing and control technology of the hydraulic system is also more advanced. The performance parameter error range of precision equipment is smaller, and there are stricter requirements on the operating environment of the equipment. Similarly, higher requirements are put forward for the relevant engineering and technical personnel, and they are required to have a more in-depth and detailed grasp of the equipment status. At the same time, the precision equipment should be matched with more sophisticated testing instruments.
(4) According to the importance of equipment in the production system or application occasions According to the importance of equipment in the production system, hydraulic equipment can be divided into key equipment, key equipment and general equipment. The key equipment is the bottleneck of the production line, and unexpected shutdowns are not allowed. Once the key equipment is shut down, it will have a greater impact on production. Therefore, key equipment and key equipment are the key objects of monitoring.
According to the application of the equipment, hydraulic equipment can be divided into many types, such as hydraulic equipment for machine tools, hydraulic equipment for plastic molding processing, hydraulic equipment for engineering machinery, hydraulic equipment for steel and metallurgy, hydraulic equipment for building materials processing, etc. In different applications, the attributes of the equipment are also very different. The fault analyst should understand the application environment's requirements for the output force and speed of the hydraulic equipment and the error range, as well as the accuracy of the action. At the same time, it should also understand that the deviation of the performance parameters of the hydraulic equipment will affect the products produced. The impact of output and quality must also be clarified about the impact of environmental factors (such as temperature, humidity, and cleanliness) on the performance damage of hydraulic equipment.
