An on-line self-cleaning melt filter

Abstract

The utility model relates to the technical field of filter equipment, and specifically discloses a melt filter with online automatic cleaning function. The melt filter comprises a filter screen, a cleaning shaft, a cleaning scraper, a channel inlet door, an impurity outlet door, a feeding pipeline and a discharging pipeline. The utility model can increase the filtering speed, prolong the filtering period, and automatically clean the impurities on the filter screen online. The filter screen does not need to be frequently replaced, and the manpower, material resources and the influence on production are minimized.

Description

Technical Field

[0001] This utility model relates to the field of filtration equipment technology, specifically disclosing an online automatic cleaning melt filter. Background Technology

[0002] When plastic is molten and extruded, impurities such as undissolved rubber particles, excess polymers, foreign matter present in the raw materials or introduced during production, and carbides that have fallen from the equipment over long-term operation can form crystal points in the finished product, severely affecting the quality of the extruded product. In such cases, a melt filter is often added between the booster pump and the extruder to remove these impurities.

[0003] During the filtration process, as the filtration time increases, impurities accumulate on the filter screen, leading to increased pressure in front of the filter screen and reduced filtration flow. This necessitates stopping the filtration process, isolating the melt filter from the production line, and manually changing the screen. Furthermore, traditional melt filters have small screen areas, which clog quickly, resulting in frequent screen replacements, increasing production instability, and wasting manpower and resources.

[0004] Therefore, there is a need to develop an online automatic cleaning melt filter to overcome the above problems. Utility Model Content

[0005] The technical solution adopted in this utility model is as follows:

[0006] An online automatic cleaning melt filter includes a filter screen 2, a cleaning shaft 3, a cleaning scraper, a channel inlet gate, an impurity outlet gate, a feed line 7, and a discharge line 8;

[0007] The molten material enters through the feed line 7. The main body of the feed line 7 is a parallel channel with a flared end. Symmetrically arranged at the junction of the parallel channel and the flared end are the first channel inlet gate 501 and the second channel inlet gate 502, which are perpendicular to the inner wall of the flared end and move into or out of the feed line 7. The first channel cleaning scraper 401 and the second channel cleaning scraper 402 are respectively located on the inner wall of the flared end and move along the inner wall. The diameter of the end of the flared end of the feed line 7 is larger than that of the filter screen 2. The gap between the filter screen 2 and the end of the flared end is the first channel impurity outlet and the second channel impurity outlet, which are closed by the first channel impurity outlet gate 601 and the second channel impurity outlet gate 602, respectively.

[0008] The feed line 7 is equipped with a rotatable cleaning shaft 3, the end of which is attached to the filter screen 2; the rear end of the filter screen 2 is connected to the discharge line 8.

[0009] Preferably, the filter screen 2 has an arc-shaped cross-section, and the cleaning shaft 3 rotates around a fixed point.

[0010] Preferably, the filter screen 2 is supported by a grid 1 at the contact surface with the discharge pipeline 8.

[0011] Furthermore, the grille 1 is made of iron.

[0012] Preferably, the first channel impurity outlet door 601 and the second channel impurity outlet door 602 are rotary opening and closing doors.

[0013] Preferably, the discharge pipeline 8 has a funnel-shaped cross-section, and the end where the filter screen 2 is located is the large-diameter end.

[0014] Preferably, the melt material is a plastic melt.

[0015] Preferably, the filter screen 2 is equipped with a pressure sensor for monitoring the melt filtration pressure.

[0016] Preferably, the melt filter operates the cleaning shaft 3, cleaning scraper, channel inlet gate, and impurity outlet gate via a remote control system.

[0017] The beneficial effects achieved by this utility model are:

[0018] This invention increases filtration speed and extends filtration cycle, while simultaneously providing rapid, online automatic cleaning of impurities on the filter screen. It eliminates the need for frequent filter replacements, minimizing manpower, material resources, and disruption to production. Attached Figure Description

[0019] Figure 1 This is a schematic cross-sectional view of the melt filter in the first state of Embodiment 1 of this utility model.

[0020] Figure 2 This is a schematic diagram of the second state cross-sectional structure of the melt filter in Embodiment 1 of this utility model. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail with reference to the following embodiments. It should be noted that this utility model is not limited to the following embodiments.

[0022] Example 1

[0023] An online automatic cleaning melt filter includes a filter screen 2, a cleaning shaft 3, a cleaning scraper, a channel inlet gate, an impurity outlet gate, a feed line 7, and a discharge line 8;

[0024] The molten material enters through the feed line 7. The main body of the feed line 7 is a parallel channel with a flared end. Symmetrically arranged at the junction of the parallel channel and the flared end are the first channel inlet gate 501 and the second channel inlet gate 502, which are perpendicular to the inner wall of the flared end and move into or out of the feed line 7. The first channel cleaning scraper 401 and the second channel cleaning scraper 402 are respectively located on the inner wall of the flared end and move along the inner wall. The diameter of the end of the flared end of the feed line 7 is larger than that of the filter screen 2. The gap between the filter screen 2 and the end of the flared end is the first channel impurity outlet and the second channel impurity outlet, which are closed by the first channel impurity outlet gate 601 and the second channel impurity outlet gate 602, respectively.

[0025] The feed line 7 is equipped with a rotatable cleaning shaft 3, the end of which is attached to the filter screen 2; the rear end of the filter screen 2 is connected to the discharge line 8.

[0026] The filter screen 2 has an arc-shaped cross-section, and the cleaning shaft 3 rotates around a fixed point. A grid 1 supports the filter screen 2 after it contacts the discharge pipeline 8. A pressure sensor is installed on the filter screen 2 to monitor the melt filtration pressure. The melt filter is operated via a remote control system, which controls the cleaning shaft 3, cleaning scraper, channel inlet gate, and impurity outlet gate.

[0027] The usage status is as follows:

[0028] The material enters the filter through the feed line 7. At this time, the cleaning shaft 3 is at point a, and the filter... Figure 1 The cleaning shaft 3, the arc-shaped filter screen 2, and the impurity outlet gate 601 form the first channel. The cleaning shaft 3, the arc-shaped filter screen 2, the impurity outlet gate 602, and the inlet gate 502 form the second channel. The material enters the melt filter through the first channel, is filtered by the arc-shaped filter screen 2, and then enters the discharge pipeline 8. The grid 1 is a supporting structure, which supports the arc-shaped filter screen 2. When the pressure in front of the filter screen increases or the flow rate decreases to the set value, the cleaning process is automatically started. The inlet gate 502 of the second channel opens, at which time the second channel cleaning scraper 402 is in the retracted state, and the second channel impurity outlet gate 602 is in the closed state. At the same time, the cleaning shaft 3 moves from point a to point b along the filter screen position axis, with the bottom of the cleaning shaft 3 in close contact with the arc-shaped filter screen 2, bringing the impurities on the arc-shaped filter screen 2 into the first channel, such as... Figure 2The material enters the melt filter through the second channel, is filtered by the arc-shaped filter screen 2, and then enters the discharge pipeline 8. The first channel cleaning scraper 401 rotates axially until it is perpendicular to the cleaning shaft 3, then closes the first channel inlet gate 501, opens the first channel impurity outlet gate 601, and moves the bottom of the first channel cleaning scraper 401 close to the cleaning shaft 3 and downwards along the cleaning shaft 3, pushing the impurities brought by the cleaning shaft 3 out of the melt filter. The first channel impurity outlet gate 601 is then closed. After the first channel cleaning scraper 401 retracts and returns to its original position, one filter cleaning cycle is completed. The first channel is then in standby mode, ready to be opened when the filter is overpressured again, and this cycle repeats.

Claims

1. An online automatically cleaning melt filter, characterized in that, Includes filter screen (2), cleaning shaft (3), cleaning scraper, channel inlet gate, impurity outlet gate, feed line (7) and discharge line (8); The molten material enters through the feed line (7). The main body of the feed line (7) is a parallel channel with a flared end. Symmetrically arranged at the junction of the parallel channel and the flared end are the first channel inlet gate (501) and the second channel inlet gate (502), which are perpendicular to the inner wall of the flared end and move into the inside or outside of the feed line (7). The first channel cleaning scraper (401) and the second channel cleaning scraper (402) are respectively located on the inner wall of the flared end and move along the inner wall. The diameter of the end of the flared end of the feed line (7) is larger than that of the filter screen (2). The gap between the filter screen (2) and the end of the flared end is the first channel impurity outlet and the second channel impurity outlet, which are closed by the first channel impurity outlet gate (601) and the second channel impurity outlet gate (602), respectively. The feed line (7) is equipped with a rotatable cleaning shaft (3), and the end of the cleaning shaft (3) is attached to the filter screen (2); the rear end of the filter screen (2) is connected to the discharge line (8).

2. The online automatic cleaning melt filter according to claim 1, characterized in that, The filter screen (2) has an arc-shaped cross section, and the cleaning shaft (3) rotates along a fixed point.

3. The online automatic cleaning melt filter according to claim 1, characterized in that, The filter screen (2) is supported by a grid (1) at the contact surface with the discharge pipeline (8).

4. The online automatic cleaning melt filter according to claim 3, characterized in that, The grille (1) is made of iron.

5. The online automatic cleaning melt filter according to claim 1, characterized in that, The first channel impurity outlet door (601) and the second channel impurity outlet door (602) are rotary opening and closing doors.

6. The online automatic cleaning melt filter according to claim 1, characterized in that, The discharge pipeline (8) has a funnel-shaped cross-section, and the end where the filter screen (2) is located is the large-diameter end.

7. The online automatic cleaning melt filter according to claim 1, characterized in that, The melt material is a plastic melt.

8. The online automatic cleaning melt filter according to claim 1, characterized in that, The filter screen (2) is equipped with a pressure sensor for monitoring the melt filtration pressure.

9. The online automatic cleaning melt filter according to claim 1, characterized in that, The melt filter operates the cleaning shaft (3), cleaning blades, channel inlet gate, and impurity outlet gate via a remote control system.

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