An injection molding machine is a device that uses a plastic molding die to make a thermosetting plastic or a thermoplastic into a finished product of various sizes, different forms, and different uses. In order to complete the main function of the plastic injection finished product, the injection molding machine must require the hydraulic control part of the injection molding machine to perform its normal function.

Based on the importance of the hydraulic control of the injection molding machine, the author analyzes the characteristics of the cylinder in the hydraulic system of the injection molding machine, aiming to find a way to effectively maintain the hydraulic system and cylinder of the injection molding machine, to achieve better play in the plastic processing industry. To promote the purpose of social construction and economic development.

First, the structural characteristics of the hydraulic system cylinder of injection molding 

machine

1. Overview of the injection molding machine hydraulic system

Injection machines and injection molding machines are other names of injection molding machines. They are equipments that use thermoplastic molding dies to make thermoset plastics or thermoplastics into finished products of various sizes, shapes and applications.

The general injection molding machine is composed of hydraulic transmission system, injection system, clamping system, heating and cooling system, lubrication system, safety monitoring system, electrical control system and so on.

The reason why the injection molding machine can produce a variety of different plastic products is that the plastic materials are melted by the cooperation between the various systems of the injection molding machine, and the hydraulic high-pressure system of the equipment will become molten. The plastic is sprayed into a previously prepared mold cavity.

2. Structural characteristics of the hydraulic system cylinder of injection molding machine

In order to complete the main function of the plastic injection finished product, the injection molding machine must require the hydraulic control part of the injection molding machine to perform its normal function. Based on the importance of the hydraulic control of the injection molding machine in the injection molding machine equipment, the author carried out the structural characteristics of the hydraulic system cylinder of the injection molding machine for the characteristics of the cylinder of the hydraulic control system of the injection molding machine.

2.1 piston cylinder

In order to explore the structural characteristics and maintenance of the hydraulic system cylinder of the injection molding machine, the author studied the piston cylinder structure of the injection molding machine. The author found that the main components of the piston cylinder are: piston, cylinder, end plate, seal ring and piston rod. Because the piston cylinder itself has certain advantages, the piston cylinder is mostly used in the hydraulic transmission system. In the process of researching piston-type cylinders, the author found that the working principle of piston-type cylinders is mainly: alternately transporting hydraulic oil to both sides of the piston in the cylinder, and using the pressure difference of hydraulic oil on both sides of the piston to realize the reciprocating motion of the piston.

2.2 plunger type cylinder

In order to explore the structural characteristics and maintenance of the hydraulic system cylinder of the injection molding machine, the author studied the piston cylinder structure of the injection molding machine. The author found that the main components of the plunger cylinder are: the plunger, the cylinder block, the guide sleeve, the end gland and the sealing rubber ring. When I studied the plunger type cylinder, I found that the difference between the piston type cylinder and the plunger type cylinder is mainly that the piston type of the piston type cylinder and the plunger type cylinder are different, and the piston type of the latter is a column type piston. It also determines that the plunger cylinder is intelligently used in transmissions with long mechanical strokes.

2.3 compound cylinder

When the compound cylinder is working, the hydraulic oil enters the cylinder from the plunger hole, so that the clamping device moves forward quickly; when the clamping is nearing the end, when the clamping cylinder (piston cylinder) enters the hydraulic cylinder, the stroke speed becomes slower, making the lock The mold force reaches the required tonnage. This type of piston and piston type working cylinder is called a composite cylinder.

Second, the maintenance of the hydraulic system and cylinder of the injection molding machine

After studying the structural characteristics of the hydraulic system cylinder of the injection molding machine, the author combines his own practical experience with a large number of theoretical analysis, and based on the structural characteristics of the hydraulic system cylinder of the injection molding machine, the maintenance and maintenance measures for the hydraulic system and the cylinder of the injection molding machine are formulated. In the process of analyzing the maintenance and repair plan of the hydraulic system cylinder of the injection molding machine, the maintenance and maintenance of the hydraulic system cylinder of the injection molding machine formulated by the author is mainly formulated for the common faults of the hydraulic system and the cylinder of the injection molding machine.

1. In order to ensure the leakage of the hydraulic cylinder piston rod and the hydraulic transmission joint during the daily use of the hydraulic system cylinder of the injection molding machine, we can pass the regular and regular time in the daily use of the hydraulic system cylinder of the injection molding machine. Check the joints of the various systems of the injection molding machine hydraulic system for leaks to avoid leakage accidents. Once the hydraulic system of the injection molding machine is inspected, it is found that the leakage of the hydraulic system of the injection molding machine must be repaired in time to repair the leaked parts, and the leaked oil should be cleaned in time.

2. When installing the pipeline, it is necessary to clean and flatten the flange end face and thread. When fixing the screws, 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 degrees Celsius. Once the system temperature rises, the system must be cooled by the cold water cooling method.

4. During the use of the injection molding machine, always check the oil level of the pressure oil, the pressure of the oil pump and the cleanliness of the pressure oil. In the case of wet weather, the concentration of the pressure oil must be checked daily, and the water pipe should be checked frequently to prevent the water from mixing into the pressure oil and causing the oil filter to clog. Always check the fuel tank and keep it clean to prevent debris from falling in. If the oil level is not high enough, the pressure oil should be replenished in time. For the lubrication of each moving part, each stroke switch 掣 and each hose and joint part are leaking oil, and should be checked once a week.

5. The hydraulic oil should be replaced in time according to the requirements of the operating procedures of the injection molding machine (usually one or two years to replace it depending on the working conditions), and the fuel tank and oil filter should be cleaned to prevent the oil passage blockage equipment from running poorly.

Third, summary

Reasonable, effective and scientific maintenance and maintenance of the hydraulic system cylinder of the injection molding machine is the prerequisite for ensuring efficient operation of the injection molding machine. Only the plastic manufacturer can achieve safe and stable production by properly and effectively completing the maintenance of the hydraulic system cylinder of the injection molding machine.