Structural characteristics and maintenance analysis of hydraulic system and oil cylinder of injection molding machine

Based on the importance of injection molding machine hydraulic control in injection molding machine equipment, the author analyzed the characteristics of the hydraulic cylinder in the injection molding machine hydraulic system in order to find an effective way to maintain the injection molding machine hydraulic system and oil cylinder, achieve the purpose of better play of the plastic processing industry, and promote social construction and economic development and construction.
1、 Structural characteristics of hydraulic system cylinder of injection molding machine
1. Overview of hydraulic system of injection molding machine
Both injection molding machine and injection molding machine are other names of injection molding machine. They are devices that use plastic molding molds to make thermosetting plastics or thermoplastics into different sizes, forms and uses of plastic products.
In our daily life, common injection molding machines are mainly divided into three categories: all-electric injection molding machines, vertical injection molding machines, and horizontal injection molding machines. Although these three types of injection molding machines have slight differences in use, their composition is generally composed of hydraulic transmission system, injection system, mold closing system, heating and cooling system, lubrication system, safety monitoring system, and electrical control system.
The reason why the injection molding machine can produce various plastic finished products is that the various systems of the injection molding machine itself change the plastic raw materials into the molten state through cooperation, and then use the hydraulic high-pressure system of the equipment to spray the plastic that has changed into the molten state into the prepared mold cavity.
2. Statistics of structural characteristics of hydraulic system cylinder of injection molding machine
In order to complete the main function of making plastic products, the hydraulic control part of the injection molding machine must play its normal function. Based on the importance of hydraulic control of injection molding machine in the equipment of injection molding machine, the author makes statistics on the structural characteristics of the hydraulic control system of injection molding machine.
2.1 Piston oil cylinder
In order to explore the structural characteristics of the hydraulic system oil cylinder of the injection molding machine and the way of maintenance, the author studied the piston type oil cylinder structure of the injection molding machine. The author found that the main components of piston cylinder are: piston, cylinder block, end plate, sealing ring and piston rod. Because piston type oil cylinder has certain advantages, piston type oil cylinder is mostly used in hydraulic transmission system. In the process of studying the piston oil cylinder, the author found that the working principle of the piston oil cylinder is mainly to transfer hydraulic oil alternately to both sides of the piston in the oil cylinder, and realize the reciprocating movement of the piston by using the pressure difference of the hydraulic oil on both sides of the piston.
2.2 Plunger type oil cylinder
In order to explore the structural characteristics of the hydraulic system oil cylinder of the injection molding machine and the way of maintenance, the author studied the piston type oil cylinder structure of the injection molding machine. The author found that the main components of the plunger cylinder are: plunger, cylinder block, guide sleeve, end gland and sealing rubber ring. When studying the plunger cylinder, the author found that the main difference between the piston cylinder and the plunger cylinder is that the piston form of the piston cylinder is different from that of the plunger cylinder. The piston form of the latter is the cylindrical piston, which also determines that the plunger cylinder is used intelligently in the transmission with long mechanical stroke.
2.3 Composite oil cylinder
When the compound oil cylinder works, the hydraulic oil enters the oil cylinder from the plunger hole, making the clamping device move forward quickly; When the mold closing is close to the end, when the mold locking cylinder (piston type cylinder) enters the hydraulic cylinder, the stroke speed slows down, so that the mold locking force reaches the required tonnage. This kind of plunger type and piston type oil cylinder that work together is called compound oil cylinder.
2、 Maintenance of hydraulic system and oil cylinder of injection molding machine
After studying the structural characteristics of the hydraulic system cylinder of the injection molding machine, the author combined his own practical experience with a lot of theoretical analysis, and formulated the maintenance countermeasures of the hydraulic system and cylinder of the injection molding machine according to the structural characteristics of the hydraulic system cylinder of the injection molding machine. In the process of analyzing the maintenance plan of the hydraulic system oil cylinder of the injection molding machine, the maintenance plan of the hydraulic system oil cylinder of the injection molding machine formulated by the author is mainly aimed at the common faults of the hydraulic system and oil cylinder of the injection molding machine.
1. In order to ensure that there is no leakage at the piston rod and hydraulic transmission joint of the hydraulic cylinder of the injection molding machine during the daily use of the hydraulic system oil cylinder, we can avoid leakage accidents by regularly and regularly checking whether there is leakage at each system joint of the injection molding machine hydraulic system. Once leakage is found in the hydraulic system of the injection molding machine during the inspection, the leaking part must be repaired in time and the leaking oil should be cleaned in time.
2. When installing the pipeline, clean and level the flange end face and thread. When fixing the screw, pay attention to even force.
3. Control the working temperature of the hydraulic system of the injection molding machine to ensure that the working temperature does not exceed 55 ℃. Once the system temperature rises, the system must be cooled by cold water cooling method.
4. During the use of the injection molding machine, the oil level of the pressure oil, the pressure of the oil pump and the cleanliness of the pressure oil should be checked frequently. In case of wet weather, the concentration of pressure oil must be checked every day, and the water pipe must be checked frequently to prevent water from mixing into the pressure oil and causing the oil filter to block. Check the oil tank regularly and keep it clean to prevent sundries from falling in. When the oil level is not high enough, add pressure oil in time. For lubricating each moving part, each travel switch and each oil pipe and joint part, check regularly once a week.
5. The hydraulic oil shall be replaced in a timely manner in strict accordance with the requirements of the operating procedures of the injection molding machine (usually once a year or two depending on the working conditions), and the oil tank and oil filter shall be cleaned to prevent the oil circuit from blocking and the equipment from running smoothly.
3、 Summary
Reasonable, effective and scientific maintenance of the hydraulic system cylinder of the injection molding machine is the premise to ensure the efficient work of the injection molding machine. Only the plastic manufacturer can achieve the purpose of safe and stable production by reasonably and effectively completing the maintenance of the hydraulic system cylinder of the injection molding machine.