Control and use of hydraulic system of injection molding machine


Hydraulic transmission of injection molding machine hyd […]

Hydraulic transmission of injection molding machine hydraulic system: The hydraulic oil is used as the working medium, and the mechanical energy of the prime mover is converted into the pressure energy of the hydraulic oil by the power element (oil pump), and then passed through the control element, and then by the actuator (cylinder or oil motor) The pressure energy is converted into mechanical energy. The Shandong injection molding machine drives the load to achieve linear or rotary motion, and through remote control of the control element and adjustment of the flow rate, the force and speed of the actuator are set. When the outside world disturbs the above system, the output of the actuator will generally deviate from the original setting value, resulting in a certain error.

Hydraulic control of hydraulic system of injection molding machine:

1. The hydraulic control of the hydraulic system of the injection molding machine is the same as the hydraulic transmission. The system also includes power components, control components and actuators, which also transmit power through oil. The difference between the two is that the hydraulic control has a feedback device. The role of the feedback device is to feedback the output of the actuator (mechanical quantities such as displacement, speed, force, etc.) and the output (which can be variable or constant). For comparison, use the deviation after comparison to control the system, so that the output of the actuator changes or remains constant with the change in the input amount. It is a hydraulic transmission system that forms a closed loop circuit, also called a hydraulic follow-up system or a hydraulic servo system.

2. On-off or logic control elements are used in the hydraulic transmission system. For its control purpose, it is to maintain the stability of the set value or simply change the direction. It is also called fixed value and sequence control element.

3. Servo control components are used in the hydraulic control system, which has a feedback structure and is controlled by electrical devices. It has high control accuracy and response speed, and the pressure and flow rate under control are often continuously changed. The output power can be amplified.

4. Proportional control is a kind of control between the above two. The proportional control valve used is an electric-hydraulic control element developed on the basis of on-off control element and servo control element. Some features of the above two types of components are used in situations where the on-off control manually adjusted cannot meet the requirements, but also does not require the strict pollution control requirements of the hydraulic system by the servo valve.