A melt filter

Abstract

The utility model relates to the technical field of plastic processing equipment, and specifically discloses a melt filter. The melt filter includes a movable plunger and a filter barrel; the filter barrel is a cylinder with openings at both ends; a discharge device is provided at the bottom of the filter barrel, and the discharge device is composed of a first filter screen and a second filter screen connected to the cylinder wall at both ends, and a top plate connecting the first filter screen and the second filter screen. The discharge device divides the bottom of the filter barrel into two parts, and the top plate of the discharge device is a sealing plate; two partition plates parallel and perpendicular to the outlet end are provided at the top of the filter barrel, and the two partition plates are respectively in the same plane with the first filter screen and the second filter screen; a feed port is formed between the two partition plates; and a discharge port is formed between the first filter screen and the second filter screen. The melt filter disclosed by the utility model can quickly clean impurities on the filter screen without replacing the filter screen, thereby reducing manpower and the impact on production.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic processing equipment, and specifically discloses a melt filter. Background Art

[0002] When plastic is extruded after being melted, impurities such as undissolved particles in the plastic, excessive polymers, foreign matter in the raw materials or brought in during the production process, and carbides dropped by the equipment during long-term operation will form crystal points in the finished product, seriously affecting the quality of the extruded product. At this time, it is often necessary to add a melt filter between the booster pump and the extruder to filter out various impurities.

[0003] During the filtration process, as the filtration time increases, impurities continue to accumulate on the filter screen, which will cause the pressure in front of the filter screen to increase and the filtration flow rate to decrease. The filtration has to be stopped and the melt filter must be isolated from the production line for manual screen replacement, which increases the instability of production and wastes manpower and material resources.

[0004] Therefore, it remains to be developed a melt filter to overcome the above problems. Utility Model Content

[0005] The technical solution adopted by the utility model is as follows:

[0006] A melt filter, comprising a movable plunger and a filter barrel; the filter barrel is a cylinder with openings at both ends; a discharge device is provided at the bottom of the filter barrel, the discharge device is composed of a first filter screen 5 and a second filter screen 11, both ends of which are connected to the barrel wall, and a top plate connecting the first filter screen 5 and the second filter screen 11, the discharge device divides the bottom of the filter barrel into two parts, and the top plate of the discharge device is a sealing plate; two partition plates are provided on the top of the filter barrel that are parallel and perpendicular to the outlet end, and the two partition plates are respectively in the same plane with the first filter screen 5 and the second filter screen 11; a feed port 9 is formed between the two partition plates; a discharge port 13 is formed between the first filter screen 5 and the second filter screen 11;

[0007] The cross-sectional shape of the movable plunger matches the shape formed by the outer sides of the feed port 9 and the discharge port 13 and the filter barrel wall, and the movable plunger is installed and moves in the space between the outer sides of the feed port 9 and the discharge port 13 and the filter barrel wall;

[0008] An inwardly curved, upwardly oblique planar structure limiter 14 is provided on the side wall at the bottom outlet of the filter barrel to limit the moving position of the movable plunger; a top pad 6 is provided on the side wall of the filter barrel to provide pressure to the filter screen for the movable plunger.

[0009] Preferably, the top pad 6 is in a trumpet shape that gradually decreases from the feed port 9 to the discharge port 13 .

[0010] Preferably, the front end of the movable plunger is a wedge-shaped raised surface structure, the side close to the feed port 9 and the discharge port 13 is a wedge-shaped long side 4, and the side close to the filter barrel wall is a wedge-shaped short side 3.

[0011] Preferably, there are two movable plungers, namely a first movable plunger 1 and a second movable plunger 10 , which are located in two independent spaces on both sides of the feed port 9 .

[0012] Furthermore, the bottom of the filter barrel is divided into a first filter end 7 and a second filter end 12 , which match the first movable plunger 1 and the second movable plunger 10 .

[0013] Preferably, the bottom of the filter barrel is sealed by a detachable bottom seal 8.

[0014] Preferably, the filter barrel, movable plunger and discharge device are all symmetrical structures.

[0015] Preferably, the filter barrel is cylindrical.

[0016] Preferably, the inclined surface of the movable plunger is provided with a plurality of heating points 2 to maintain the fluidity of the material.

[0017] Preferably, the melt filter further comprises a scraper for removing impurities remaining in the stopper 14 .

[0018] Beneficial effects achieved by the utility model:

[0019] The melt filter disclosed by the utility model can quickly clean the impurities on the filter screen without replacing the filter screen, thereby minimizing the manpower and the impact on production. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the cross-sectional structure of the melt filter of the utility model. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail in conjunction with the following embodiments. It should be noted that the utility model is not limited to the following embodiments.

[0022] Example 1

[0023] like Figure 1As shown, a melt filter comprises a movable plunger and a filter barrel; the filter barrel is a cylinder with openings at both ends; a discharge device is provided at the bottom of the filter barrel, the discharge device is composed of a first filter screen 5 and a second filter screen 11 both ends of which are connected to the barrel wall, and a top plate connecting the first filter screen 5 and the second filter screen 11, the discharge device divides the bottom of the filter barrel into two parts, and the top plate of the discharge device is a sealing plate; two partition plates parallel and perpendicular to the outlet end are provided at the top of the filter barrel, and the two partition plates are respectively in the same plane with the first filter screen 5 and the second filter screen 11; a feed port 9 is formed between the two partition plates; a discharge port 13 is formed between the first filter screen 5 and the second filter screen 11;

[0024] The cross-sectional shape of the movable plunger matches the shape formed by the outer sides of the feed inlet 9 and the discharge port 13 and the filter barrel wall, and the movable plunger is installed and moves in the space between the outer sides of the feed inlet 9 and the discharge port 13 and the filter barrel wall; the front end of the movable plunger is a wedge-shaped convex surface structure, the side close to the feed inlet 9 and the discharge port 13 is a wedge-shaped long side 4, and the side close to the filter barrel wall is a wedge-shaped short side 3

[0025] An inwardly curved, upwardly inclined planar structure limiter 14 is provided on the side wall at the bottom outlet of the filter barrel, which is used to limit the moving position of the movable plunger; a top pad 6 is provided on the side wall of the filter barrel, which is used to provide pressure to the filter screen for the movable plunger; the top pad 6 is in the shape of a trumpet that gradually narrows from the feed port 9 to the discharge port 13.

[0026] There are two movable plungers, namely a first movable plunger 1 and a second movable plunger 10, which are located in two independent spaces on both sides of the feed port 9. The bottom of the filter barrel is divided into a first filter end 7 and a second filter end 12, which match the first movable plunger 1 and the second movable plunger 10.

[0027] The bottom of the filter barrel is sealed by a detachable bottom plug 8. The filter barrel is cylindrical, and the filter barrel, the movable plunger, and the discharge device are all symmetrical structures. The inclined surface of the movable plunger is provided with a plurality of heating points 2 to maintain the fluidity of the material. The melt filter also includes a scraper for removing impurities remaining in the stopper 14.

[0028] When in use, the material enters the filter from the feed port 9, and enters the first filter end 7 and the second filter end 12 from two paths respectively. It flows out from the discharge port 12 through the first filter screen 5 and the second filter screen 11 inside the filter barrel. The structures and operations inside the first filter end 7 and the second filter end 12 are exactly the same. Now, the cleaning of the first filter screen 5 of the first filter end 7 is taken as an example. When the pressure in front of the filter screen increases or the flow rate decreases, the cleaning process is started: the bottom plug 8 of the filter barrel 7 is opened. The first movable plunger 1 begins to move into the first filter end 7. When the wedge-shaped convex surface at the front end of the first movable plunger 1 contacts the first filter screen 5, the process of the material entering the first filter barrel 7 can be cut off. The first movable plunger 1 continues to move into the first filter end 7, and the wedge-shaped short side surface 3 of the first movable plunger 1 contacts the slope at the front end of the top pad 6. As the plunger 1 continues to move, the top pad 6 gradually applies a pressure to the first filter screen 5 to make the first movable plunger 1 fit closely with the first filter screen 5 to remove the impurities accumulated thereon. The first movable plunger 1 continues to move, and stops moving when the front end of the first movable plunger 1 reaches the bottom of the filter barrel. A stopper 14 is provided on the outside of the bottom outlet of the filter barrel. The material on the inclined surface of the plunger is removed by manual scraping or natural shedding. After the material on the inclined surface is cleaned, the first movable plunger 1 returns, and the bottom seal 8 of the filter barrel is automatically closed. After the first movable plunger 1 returns to the initial position, the material re-enters the filter barrel, completing a filter screen cleaning work.

Claims

1. A melt filter, characterized in that: The invention comprises a movable plunger and a filter barrel; the filter barrel is a cylinder with openings at both ends; a discharge device is arranged at the bottom of the filter barrel, the discharge device is composed of a first filter screen (5) and a second filter screen (11) both ends of which are connected to the cylinder wall, and a top plate connecting the first filter screen (5) and the second filter screen (11); the discharge device divides the bottom of the filter barrel into two parts, and the top plate of the discharge device is a sealing plate; two partition plates are arranged at the top of the filter barrel, which are parallel and perpendicular to the outlet end, and the two partition plates are respectively in the same plane as the first filter screen (5) and the second filter screen (11); a feed inlet (9) is formed between the two partition plates; and a discharge outlet (13) is formed between the first filter screen (5) and the second filter screen (11); The cross-sectional shape of the movable plunger matches the shape formed by the outside of the feed inlet (9), the discharge outlet (13) and the filter barrel wall, and the movable plunger is installed and moves in the space between the outside of the feed inlet (9), the discharge outlet (13) and the filter barrel wall; A plane structure limiter (14) that bends inward and faces upward is provided on the side wall at the bottom outlet of the filter barrel, and is used to limit the moving position of the movable plunger; a top pad (6) is provided on the side wall of the filter barrel, and is used to provide pressure for the movable plunger to the filter screen.

2. The melt filter according to claim 1, characterized in that The top pad (6) is in the shape of a trumpet mouth that gradually narrows in the direction from the feed port (9) to the discharge port (13).

3. The melt filter according to claim 1, characterized in that The front end of the movable plunger is a wedge-shaped raised surface structure, the side close to the feed port (9) and the discharge port (13) is a wedge-shaped long side surface (4), and the side close to the filter barrel wall is a wedge-shaped short side surface (3).

4. The melt filter according to claim 1, characterized in that There are two movable plungers, namely a first movable plunger (1) and a second movable plunger (10), which are located in two independent spaces on both sides of the feed port (9).

5. The melt filter according to claim 4, characterized in that The bottom of the filter barrel is divided into a first filter end (7) and a second filter end (12), which are matched with a first movable plunger (1) and a second movable plunger (10).

6. The melt filter according to claim 1, characterized in that The bottom of the filter barrel is sealed by a detachable bottom seal (8).

7. The melt filter according to claim 1, characterized in that The filter barrel, the movable plunger and the discharging device are all symmetrical structures.

8. The melt filter according to claim 1, characterized in that The filter barrel is in the shape of a cylinder.

9. The melt filter according to claim 1, characterized in that: The inclined surface of the movable plunger is provided with a plurality of heating points (2) to maintain the fluidity of the material.

10. The melt filter according to claim 1, characterized in that The melt filter also includes a scraper for removing impurities remaining in the stopper (14).

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