Overview of the structure of the hydraulic non-stop screen changer

The hydraulic non-stop screen changer is mainly composed of the following structural parts:

The main body part:

Runner: It is the channel through which the plastic melt passes, and its design directly affects the flow performance and filtration effect of the melt. The flow channel is generally optimized with no dead angle and no stagnant flow, which enables the melt to pass through the screen changer smoothly, reduces the residence time of the melt in the flow channel, and lowers the risk of degradation of the melt.

Filtration components:

Porous plate: located at the front end of the filter screen, it plays the role of supporting and fixing the filter screen. The porous plate is distributed with a number of small holes, the size and density of these holes will be designed according to the specific filtration requirements, allowing the melt to pass through while blocking larger impurities and unplasticized particles.

Strainer: This is the core component of the screen changer and is used to filter impurities from the plastic melt. Filter mesh is usually made of stainless steel or other high-strength, high-temperature-resistant metal materials with high filtration accuracy and good corrosion resistance. The shape and size of the filter mesh will vary according to the type and specification of the screen changer, and the common ones are round, oval, cylinder and so on.

Switching device:

Slide plate or mesh column (plunger): in the double-column double-station hydraulic non-stop screen changer, the mesh column is the key component to realize the switching of filter mesh. During normal operation, the two stations work at the same time; when changing nets, one net works and one net is replaced, which can realize non-stop production.

Guide rail or guiding mechanism: Provide guidance and support for the movement of the slide plate or net column to ensure that it can accurately switch between the working position and the replacement position. The guide rail or guide mechanism needs to have good wear resistance and precision to ensure the long-term stable operation of the switching device.

Sealing components:

Sealing components: are used to prevent the plastic melt from leaking out of the gap in the screen changer during the screen changing process. The seals are usually made of high-temperature- and high-pressure-resistant rubber materials or other special sealing materials with good elasticity and sealing performance. Seals will be set up between the body of the screen changer and the slide plate or net post, between the porous plate and the shell, etc. to ensure the sealing of the screen changer.

Sealing structure: According to different types of screen changers and design requirements, the sealing structure can adopt rigid sealing, flexible sealing or other special sealing methods. Rigid sealing structure has high sealing strength and reliability, and can maintain good sealing performance at high temperature and high pressure; flexible sealing structure has better adaptability and self-compensation ability, and can make up for the machining error and assembly error of parts to a certain extent.

Hydraulic drive system:

Hydraulic cylinder: it is the core component of the hydraulic drive system, which pushes the slide plate or net column to move through the pressure effect of hydraulic oil to realize the switching of the filter. The design of the hydraulic cylinder needs to take into account the working pressure, stroke, speed and other factors to ensure that it can meet the working requirements of the screen changer.

Hydraulic pump station: provide hydraulic power for the hydraulic cylinder, including oil pump, motor, oil tank, control valve and other components. The oil pump pumps out and pressurizes the hydraulic oil in the tank, and delivers the hydraulic oil to the hydraulic cylinder through the control valve to realize the outstretching and retracting action of the hydraulic cylinder. The performance and reliability of the hydraulic pump station directly affects the speed and stability of the screen changer.

Hydraulic pipeline: used to connect the hydraulic pump station and hydraulic cylinder, the hydraulic oil will be delivered to the hydraulic cylinder. Hydraulic piping needs to have sufficient pressure resistance and sealing to ensure the normal delivery of hydraulic oil.

Control system:

Sensor: It is used to monitor the working status of the screen changer, such as temperature, pressure, position and other parameters, and feedback these parameters to the control system. The precision and reliability of the sensor is very important to the normal operation and automatic control of the screen changer.

Controller: According to the information fed back from the sensor, the hydraulic drive system is controlled to realize the automatic switching of the filter and other operations of the screen changer. The controller can adopt PLC, microcontroller and other control chips, which have the advantages of simple programming, high control precision and high reliability.

Operation interface: provide a convenient operation platform for the operator to set the working parameters of the screen changer, monitor the running status of the screen changer, and carry out manual operation. The operation interface can be in the form of touch screen, buttons, indicator lights, etc., which is characterized by simple operation and intuitive and easy to understand.

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