Anti-reflux device of double-column double-station screen changer

Abstract

The utility model relates to an anti-reflux device of a double-column double-station screen changer, which comprises a double-station screen changer body, two columnar die heads are arranged in the double-station screen changer body, one end of each die head is fixedly communicated with a columnar filter screen, and the outer diameter of each filter screen is smaller than that of each die head. A gap is formed between the filter screen and the inner wall of the double-station screen exchanger body, and an inlet runner communicated with the interior of the filter screen is arranged on one side of the double-station screen exchanger body. Fluid plastic in a molten state enters the gap between the double-station screen changer body and the filter screen through the inlet runner and then enters the outlet runner after passing through the filter screen, the valve element and the valve body are separated through impact of the fluid plastic, and therefore the fluid plastic can be discharged from the gap between the two arc-shaped plates, and the sealing performance of the double-station screen changer is improved. And when no fluid plastic impact exists, the valve element is reset, the valve element abuts against one end of the valve body, and therefore the anti-backflow effect is achieved.

Description

Technical Field

[0001] This utility model relates to anti-backflow technology for screen changers, and in particular to an anti-backflow device for a dual-column dual-station screen changer. Background Technology

[0002] A screen changer is a manual or automatic switching device comprising one or more screens used to filter out foreign particles and impurities as plasticized materials flow through the screen. The screen is supported by an alloy perforated plate mounted on a plate or column carrier that can be moved to switch between a system’s operating position and an offline non-operating position.

[0003] In existing dual-column dual-station screen changers, molten plastic enters through the feed inlet, passes through the filter screen, and flows into the die cavity and then through the discharge outlet. The molten plastic is prone to backflow. Therefore, this invention proposes an anti-backflow device for dual-column dual-station screen changers to meet the current needs. Utility Model Content

[0004] The purpose of this invention is to provide a backflow prevention device for a dual-column dual-station screen changer, which solves the problem that molten fluid plastic is prone to backflow when flowing through the outlet of the dual-column dual-station screen changer.

[0005] To address the aforementioned problems, this utility model provides a backflow prevention device for a dual-column dual-station screen changer, comprising a dual-station screen changer body. The body contains two columnar dies, one end of which is fixedly connected to a columnar filter screen. The outer diameter of the filter screen is smaller than the outer diameter of the dies, ensuring the filter screen is located within the body and has a gap with the inner wall. One side of the body has an inlet channel communicating with the filter screen, and the other side has two outlet channels. The dies have openings communicating with the outlet channels. The two outlet channels are arranged in a V-shape, and each channel contains a valve body. One end of each valve body has two integrally formed arc-shaped plates, with a columnar valve core slidably connected between corresponding arc-shaped plates. The outer diameter of the valve core is larger than the inner diameter of the valve body, allowing the valve core to contact one end of the valve body.

[0006] The anti-backflow device for the dual-column, dual-station screen changer provided by this utility model also has the following technical features:

[0007] Furthermore, L-shaped connecting plates are bolted to the two corresponding arc-shaped plates, and the other side of the connecting plate is bolted to two other arc-shaped plates, with a gap between the two corresponding arc-shaped plates.

[0008] Furthermore, one side of the valve core is connected to the corresponding side of the connecting plate via a spring.

[0009] Furthermore, a positioning post is fixedly connected to one side of the valve core, and a spring can be fitted onto the outside of the corresponding positioning post.

[0010] Furthermore, there are two inlet channels, which are arranged in a figure-eight shape, and each inlet channel has a horn-shaped inlet hole at its inlet end.

[0011] Furthermore, the outlet ends of the two outlet channels are connected to a funnel-shaped outlet hole.

[0012] This invention has the following beneficial effects: molten fluid plastic enters the gap between the dual-station screen changer body and the filter screen through the inlet channel, and then enters the outlet channel after passing through the filter screen. The fluid plastic impacts the valve core and valve body, allowing the fluid plastic to be discharged from the gap between the two arc-shaped plates. When there is no fluid plastic impact, the valve core resets, causing one end of the valve core to contact the valve body, thus preventing backflow. Attached Figure Description

[0013] Figure 1 This is a perspective view of an embodiment of the present utility model;

[0014] Figure 2 This is a schematic diagram of the inlet flow channel according to an embodiment of the present utility model;

[0015] Figure 3 This is a cross-sectional structural diagram of the dual-station screen changer body according to an embodiment of the present utility model;

[0016] Figure 4 This is a schematic diagram of the valve body installation position in an embodiment of this utility model;

[0017] Figure 5 This is a schematic diagram of the structure of the mold head and filter screen in the embodiment of this utility model;

[0018] Figure 6 This is a schematic diagram of the structure of the valve body, the arc plate, and the connecting plate in an embodiment of this utility model. Detailed Implementation

[0019] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0020] like Figures 1 to 6In the embodiment of the anti-backflow device for the dual-column dual-station screen changer of this utility model shown, the anti-backflow device includes a dual-station screen changer body 1. Two columnar molds 2 are provided inside the dual-station screen changer body 1. One end of each mold 2 is fixedly connected to a columnar filter screen 3. The filter screen 3 has filter holes around its periphery, one end of which is connected to the mold 2, and the other end is sealed. The internal cavity of the mold 2 is connected to the interior of the filter screen 3. The outer diameter of the filter screen 3 is smaller than the outer diameter of the mold 2, so that the filter screen 3 is located inside the dual-station screen changer body 1 and has a gap between it and the inner wall of the dual-station screen changer body 1. One side of the dual-station screen changer body 1 has an inlet channel 4 communicating with the interior of the filter screen 3, and the other side of the dual-station screen changer body 1 has two outlet channels 5. The mold 2 has openings for the outlet channels... The opening 5 connects to the two outlet channels 5, which are arranged in a figure-eight shape. Each outlet channel 5 is equipped with a valve body 6. One end of the valve body 6 has two integrally formed arc-shaped plates 7. A columnar valve core 8 is slidably connected between the two corresponding arc-shaped plates 7. The outer diameter of the valve core 8 is larger than the inner diameter of the valve body 6, so that the valve core 8 can abut against one end of the valve body 6. The molten fluid plastic enters the gap between the dual-station screen changer body 1 and the filter screen 3 through the inlet channel 4, and enters the outlet channel 5 after passing through the filter screen 3. The impact of the fluid plastic separates the valve core 8 from the valve body 6, so that the fluid plastic can be discharged from the gap between the two arc-shaped plates 7. When there is no fluid plastic impact, the valve core 8 resets, so that the valve core 8 abuts against one end of the valve body 6, thereby playing a role in preventing backflow.

[0021] In one embodiment of this application, preferably, two corresponding arc plates 7 are connected by bolts to an L-shaped connecting plate 9, and the other side of the connecting plate 9 is connected to two other arc plates 7 by bolts. A gap is left between the two corresponding arc plates 7. The connecting plate 9 fixes the relative position of the two valve bodies 6, so that the two valve bodies 6 are arranged in a figure-eight shape, which facilitates the two outlet channels 5 to converge and discharge at one place.

[0022] In one embodiment of this application, preferably, one side of the valve core 8 is connected to the corresponding side of the connecting plate 9 via a spring 10, so that the valve core 8 can be easily reset under the action of the spring 10.

[0023] In one embodiment of this application, preferably, a positioning post 11 is fixedly connected to one side of the valve core 8, and the spring 10 can be fitted on the outside of the corresponding positioning post 11, so that the positioning post 11 can limit the spring 10.

[0024] In one embodiment of this application, preferably, there are two inlet channels 4, which are arranged in a figure-eight shape. The inlet ends of the two inlet channels 4 are provided with a funnel-shaped inlet hole, which facilitates more uniform feeding of the fluid plastic.

[0025] In one embodiment of this application, preferably, the outlet ends of the two outlet channels 5 are connected to a funnel-shaped outlet hole, thereby facilitating the discharge of fluid plastic.

[0026] In use, the molten plastic enters the gap between the dual-station screen changer body 1 and the filter screen 3 through the inlet channel 4, passes through the filter screen 3 into the cavity of the die head 2, and then enters the outlet channel 5. The impact of the molten plastic causes the valve core 8 to separate from the valve body 6, and the spring 10 is compressed, so that the molten plastic can be discharged from the gap between the two arc plates 7. When there is no impact of molten plastic, the valve core 8 is reset under the action of the spring, so that the valve core 8 and one end of the valve body 6 are in contact, thereby playing a role in preventing backflow. The relative position of the two valve bodies 6 is fixed by the connecting plate 9, so that the two valve bodies 6 are arranged in a V-shape, which facilitates the convergence of the two outlet channels 5 for discharge.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A double-column double-station screen changer backflow prevention device, comprising a double-station screen changer body (1), characterized in that, The double-station screen changer body (1) is provided with two cylindrical die heads (2), one end of the die head (2) is fixedly connected with a cylindrical filter screen (3), the outer diameter of the filter screen (3) is smaller than that of the die head (2), so that the filter screen (3) is located in the double-station screen changer body (1) and has a gap between the filter screen (3) and the inner wall of the double-station screen changer body (1), one side of the double-station screen changer body (1) is provided with an inlet flow channel (4) in communication with the inside of the filter screen (3), the other side of the double-station screen changer body (1) is provided with two outlet flow channels (5), the die head (2) is provided with an opening in communication with the outlet flow channel (5), the two outlet flow channels (5) are arranged in a spread shape, and the two outlet flow channels (5) are each provided with a valve body (6), one end of the valve body (6) is integrally formed with two arc-shaped plates (7), a cylindrical valve core (8) is slidingly connected between the two corresponding arc-shaped plates (7), and the outer diameter of the valve core (8) is larger than the inner diameter of the valve body (6), so that the valve core (8) can abut against one end of the valve body (6).

2. The anti-backflow device of the double-column double-station web changer according to claim 1, characterized in that: Corresponding two arc-shaped plates (7) are connected with an L-shaped connecting plate (9) through bolts, the other side of the connecting plate (9) is connected with the other two arc-shaped plates (7) through bolts, and a gap is left between the two corresponding arc-shaped plates (7).

3. The anti-backflow device of the double-column double-station web changer according to claim 1, characterized in that: One side of the valve core (8) is connected with the corresponding side of the connecting plate (9) through a spring (10).

4. The anti-backflow device of the double-column double-station web changer according to claim 3, characterized in that: One side of the valve core (8) is fixedly connected with a positioning column (11), and the spring (10) can be sleeved outside the corresponding positioning column (11).

5. The anti-backflow device of the double-column double-station web changer according to claim 1, characterized in that: The number of the inlet flow channels (4) is two, the two inlet flow channels (4) are arranged in a spread shape, and the inlet end of the two inlet flow channels (4) is provided with a horn-shaped inlet hole.

6. The anti-backflow device of the double-column double-station web changer according to claim 1, characterized in that: The outlet end of the two outlet flow channels (5) is communicated with a horn-shaped outlet hole.

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