Multi-channel switching plunger sealing type filter and working method thereof

Abstract

The invention discloses a multi-channel switching plunger sealing type filter and a working method thereof. The multi-channel switching plunger sealing type filter comprises a plunger filter cavity, a plunger sealing rod and a reciprocating actuator. The plunger sealing rod is arranged in a cavity of the plunger filter in a sliding mode, the plunger sealing rod is connected with the reciprocating actuator, and a first filter, a second filter and a third filter are arranged in the plunger sealing rod side by side. A front mixing porous plate and a rear mixing porous plate are arranged in each of the first filter, the second filter and the third filter, and a plurality of smooth circular holes are formed in each of the front mixing porous plates and the rear mixing porous plates in a circular array manner in the axis direction; and a filter screen is arranged between the front mixing porous plate and the rear mixing porous plate. The spinning assembly is small in space size and reasonable in structural layout, mixing, filtering and pressure equalizing functions of the spinning assembly are transferred to the spinning assembly, the single-time spinning time of a whole spinning line is prolonged, and the single-time spinning capacity is improved.

Description

Technical Field

[0001] The invention belongs to the field of filtering technology, in particular to a multi-channel switching plunger sealing filter and a working method thereof. Background Art

[0002] In the field of chemical engineering, especially in the fields of materials science and filtration technology, the preparation of mesophase pitch-based carbon fibers is an important process. The reason why carbon fibers have attracted much attention is due to their excellent physical and mechanical properties. Carbon fibers are a new type of fiber material with high strength, high modulus and low density. These characteristics make them an ideal choice for many high-tech fields and are widely used in aerospace, military industry, sports and leisure and other fields. Mesophase pitch-based carbon fibers have become one of the important types of carbon fibers due to their excellent performance. In the process of preparing mesophase pitch-based carbon fibers, ensuring the high purity of the molten material is crucial to the quality of the final carbon fiber product, and filtration of the molten material is a key step. The molten material contains impurities and gels. If they are not effectively filtered, the performance of the carbon fibers will be affected, and thus their application effects in various fields will be affected.

[0003] The traditional filtering method mainly uses the filtering module in the spinning assembly to achieve the mixing, filtering, and pressure equalization functions. This filtering module is usually composed of a mixing porous plate and a filter mesh. The molten material is passed through the mixing porous plate and the filter mesh to achieve the filtration of impurities and gels. However, the traditional filtering method can only be implemented in the spinning assembly, and the spatial size of the spinning assembly is limited, which limits the performance improvement of the filtering module. Secondly, the traditional filtering method cannot realize the online replacement of the filter. When the filter module is blocked, the production line needs to be stopped for cleaning, which affects the work efficiency. Finally, the traditional filtering method cannot ensure the uniformity of the physical and chemical properties of the molten material, which affects the performance of the carbon fiber. Summary of the invention

[0004] The object of the present invention is to provide a multi-channel switching plunger sealed filter and a working method thereof, so as to solve the problem that the existing filter module is prone to clogging and affects the working efficiency.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A multi-channel switching plunger sealed filter, comprising a plunger filter chamber, a plunger sealing rod and a reciprocating actuator;

[0007] The plunger sealing rod is slidably arranged in the plunger filter cavity, the plunger sealing rod is connected to the reciprocating actuator, the first filter, the second filter and the third filter are arranged in parallel in the plunger sealing rod, the first filter, the second filter and the third filter are all provided with a pre-mixing porous plate and a post-mixing porous plate, the pre-mixing porous plate and the post-mixing porous plate are both provided with a plurality of smooth circular holes in a circular array along the axial direction, and a filter screen is arranged between the pre-mixing porous plate and the post-mixing porous plate.

[0008] Furthermore, the plunger filter cavity is formed by connecting a plurality of sections, the outer side of the plunger filter cavity is a rectangular body structure, and the inner side of the plunger filter cavity is a cylindrical hole structure.

[0009] Furthermore, heating sources are installed on two opposite sides of the outside of the plunger filter cavity, and one side of the plunger filter cavity is connected to a support seat via a flange.

[0010] Furthermore, the plunger sealing rod is provided with a first filter mounting hole, a second filter mounting hole and a third filter mounting hole in parallel, and the first filter mounting hole, the second filter mounting hole and the third filter mounting hole are all multi-stage variable diameter cylindrical hole structures;

[0011] The first filter is fixedly installed in the first filter installation hole by a fastener, the second filter is fixedly installed in the second filter installation hole by a fastener, and the third filter is fixedly installed in the third filter installation hole by a fastener.

[0012] Furthermore, a first pre-mixing porous plate and a first post-mixing porous plate are arranged in the first filter, and a first filter screen is arranged between the first pre-mixing porous plate and the first post-mixing porous plate;

[0013] A second pre-mixing porous plate and a second post-mixing porous plate are arranged in the second filter, and a second filter screen is arranged between the second pre-mixing porous plate and the second post-mixing porous plate;

[0014] A third pre-mixing porous plate and a third post-mixing porous plate are arranged in the third filter, and a third filter screen is arranged between the third pre-mixing porous plate and the third post-mixing porous plate.

[0015] Furthermore, a material inlet, a material outlet, a first nitrogen inlet, a first nitrogen outlet, a second nitrogen inlet and a second nitrogen outlet are respectively provided on opposite sides of the plunger filter cavity; the material inlet and the material outlet are coaxially connected to the first filter mounting hole, the first nitrogen inlet and the first nitrogen outlet are coaxially connected to the second filter mounting hole, and the second nitrogen inlet and the second nitrogen outlet are coaxially connected to the third filter mounting hole.

[0016] Further, a first front sealing baffle is installed on the outer side of the first nitrogen inlet, a first rear sealing baffle is installed on the outer side of the first nitrogen outlet, a second front sealing baffle is installed on the outer side of the second nitrogen inlet, and a second rear sealing baffle is installed on the outer side of the second nitrogen outlet. Circular tube flow channels are opened in the first front sealing baffle, the first rear sealing baffle, the second front sealing baffle and the second rear sealing baffle, and the circular tube flow channels of the first front sealing baffle and the first rear sealing baffle are coaxial with the second filter mounting hole, and the circular tube flow channels of the second front sealing baffle and the second rear sealing baffle are coaxial with the third filter mounting hole.

[0017] Furthermore, a first sealing valve is arranged in the circular tube flow channel of the first front sealing baffle, a second sealing valve is arranged in the circular tube flow channel of the first rear sealing baffle, a third sealing valve is arranged in the circular tube flow channel of the second front sealing baffle, and a fourth sealing valve is arranged in the circular tube flow channel of the second rear sealing baffle.

[0018] Furthermore, a first pressure sensor and a first temperature sensor are installed on both sides of the material inlet, and a second pressure sensor and a second temperature sensor are installed on both sides of the material outlet.

[0019] A method for operating the multi-channel switching plunger sealed filter comprises:

[0020] The reciprocating actuator controls the plunger sealing rod to reciprocate, so that the first filter, the second filter and the third filter can be switched freely in the working state;

[0021] When there are too many impurities inside one of the filter channels of the first filter, the second filter and the third filter and it is blocked, the working flow channel of the molten material is switched to another normal filtering channel through the control of the reciprocating actuator, and the blocked filter is disassembled and cleaned while the production line is running, and then replaced with a new filter for standby use.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention provides a multi-channel switching plunger sealed filter, which adopts a plunger cylinder sealing structure, slides a plunger sealing rod in a plunger filter cavity, connects a reciprocating actuator to the plunger sealing rod, and arranges three identical filters in parallel in the plunger sealing rod, so as to realize the sealing function between the material and the environment under the premise of being able to move in the axial direction, and controls the left and right reciprocating motion of the plunger sealing rod by the reciprocating actuator, so as to realize the free switching of the three filters under high-temperature working conditions. The filter adopts a circular layer combination structure, integrates the functions of mixing, pressure equalization, filtering, and gel removal, and the filter makes the molten material before reaching the component repeatedly mixed in multiple mixing porous plates inside the filter, and the impurities and gel are filtered in the filter net, so as to ensure that the molten material reaching the inlet of the spinning component is uniformly mixed in components, and the impurities and gel are filtered and removed cleanly, so as to improve the quality of the spun fiber, and improve the consistency of the fiber performance and the stability of the spinning process. When there are too many impurities in a filter channel and blockage occurs, the working flow channel of the molten material is switched to another normal filter channel through the control of the reciprocating actuator, so that the production continues without being affected by the filter blockage. The filter adopts a docking assembly structure, and the clogged filter can be disassembled and cleaned while the production line is running, and then a new filter can be replaced for standby. Such repeated replacement can achieve uninterrupted spinning production and improve work efficiency. The present invention has a small spatial size, a reasonable structural layout, a simple structure, and is easy to process and form. The filter as a whole adopts a sliding sealing structure of a plunger cylinder and a modular symmetrical assembly structure. Each structural unit cooperates tightly and reliably, and the installation and disassembly are convenient and quick, and the parts have good interchangeability. The filter of the present invention transfers the mixing, filtering, and pressure equalization functions realized by the spinning assembly to itself. According to actual needs, the number of filtering layers can be increased and the filtering type can be changed to improve its ability to filter impurities and delay the time when the filter screen is blocked. Compared with using only the spinning assembly to realize the mixing and filtering functions, the filter prolongs the single spinning time of the entire spinning line and improves the single spinning capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 It is a top view of the multi-channel switching plunger sealed filter of the present invention.

[0026] Figure 2 It is a side view of the multi-channel switching plunger sealed filter of the present invention.

[0027] Figure 3 It is a cross-sectional view of the multi-channel switching plunger sealed filter of the present invention.

[0028] Wherein: 01-first filter, 02-second filter, 03-third filter, 1-plunger filter cavity, 11-plunger filter inlet flow channel, 12-plunger filter outlet flow channel, 2-plunger sealing rod, 3-first filter mounting hole, 4-second filter mounting hole, 5-third filter mounting hole, 31-first pre-mixing porous plate, 41-second pre-mixing porous plate, 51-third pre-mixing porous plate, 32-first post-mixing porous plate, 42-second post-mixing porous plate, 52-third Rear mixing porous plate, 33-first filter screen, 43-second filter screen, 53-third filter screen, 44-first front sealing baffle, 54-second front sealing baffle, 45-first rear sealing baffle, 55-second rear sealing baffle, 46-first sealing valve, 47-second sealing valve, 56-third sealing valve, 57-fourth sealing valve, 6-support seat, 7-reciprocating actuator, 81-first pressure sensor, 82-second pressure sensor, 91-first temperature sensor, 92-second temperature sensor. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0036] See also Figure 1 The present invention provides a multi-channel switching plunger sealed filter, including a plunger filter chamber 1, a plunger sealing rod 2, a support seat 6 and a reciprocating actuator 7.

[0037] The plunger filter cavity 1 is a cavity composed of a multi-section rectangular body structure on the outside and a cylindrical hole structure on the inside. The rectangular body structure on the outside is parallel to the top and bottom, which is used to install a heating source and a temperature control system, and is used to heat the plunger filter cavity 1 and all internal parts to ensure the normal flow of materials. The front and back are stepped multi-layer parallel surfaces, convex in the middle, concave on both sides, and flange edges on the left and right sides. The right flange is docked with the flange of the support seat 6, and the cylindrical hole structure inside is a circular hole cavity with a smooth inner wall. The plunger sealing rod 2 is a cylindrical structure with a smooth surface. The plunger sealing rod 2 is slidably arranged in the circular hole cavity of the plunger filter cavity 1, and can slide in the cylindrical hole and fit tightly to seal the material. On the right side of the support seat 6 is a reciprocating actuator 7, and the plunger sealing rod 2 is connected to the reciprocating actuator 7, and the reciprocating actuator 7 drives the plunger sealing rod 2 to reciprocate left and right.

[0038] The plunger sealing rod 2 is provided with a first filter mounting hole 3, a second filter mounting hole 4 and a third filter mounting hole 5 in parallel. The first filter mounting hole 3, the second filter mounting hole 4 and the third filter mounting hole 5 are all multi-stage variable diameter cylindrical hole structures.

[0039] The first filter 01 is installed in the first filter mounting hole 3 by fasteners, and the first filter 01 includes a first pre-mixing porous plate 31, a first post-mixing porous plate 32, and a second filter screen 33. The first pre-mixing porous plate 31 and the first post-mixing porous plate 32 are both annular porous structures, and a plurality of smooth circular holes are arranged in a circular array along the axial direction, and the outer diameter of the circular ring is consistent with the inner diameter of the first filter mounting hole 3, and the first filter screen 33 is sandwiched between the first pre-mixing porous plate 31 and the first post-mixing porous plate 32. The second filter 02 is installed in the second filter mounting hole 4 by fasteners, and the second filter 02 includes a second pre-mixing porous plate 41, a second post-mixing porous plate 42, and a second filter screen 43. The second pre-mixing porous plate 41 and the second post-mixing porous plate 42 are both annular porous structures, with a plurality of smooth circular holes arranged in a circular array along the axial direction, the outer diameter of the circular ring is consistent with the inner diameter of the second filter mounting hole 4, and the second filter screen 43 is sandwiched between the second pre-mixing porous plate 41 and the second post-mixing porous plate 42. A third filter 03 is installed in the third filter mounting hole 5 by fasteners, and the third filter 03 includes a third pre-mixing porous plate 51, a third post-mixing porous plate 52 and a third filter screen 53. The third pre-mixing porous plate 51 and the third post-mixing porous plate 52 are both annular porous structures, with a plurality of smooth circular holes arranged in a circular array along the axial direction, the outer diameter of the circular ring is consistent with the inner diameter of the third filter mounting hole 5, and the third filter screen 53 is sandwiched between the third pre-mixing porous plate 51 and the third post-mixing porous plate 52. The first filter 01, the second filter 02 and the third filter 03 are filters with a circular layer combination structure, integrating the functions of mixing, pressure equalization, filtration, and gel removal. The number and structure of the mixing porous plates and filter screens can be increased, deleted, improved, and optimized according to actual process needs, making their use process range more flexible and varied.

[0040] like Figure 2As shown, a material inlet, a material outlet, a first nitrogen inlet, a first nitrogen outlet, a second nitrogen inlet and a second nitrogen outlet are respectively provided on the front and rear sides of the plunger filter cavity 1. The material inlet and the material outlet are coaxially connected to the first filter mounting hole 3, the first nitrogen inlet and the first nitrogen outlet are coaxially connected to the second filter mounting hole 4, and the second nitrogen inlet and the second nitrogen outlet are coaxially connected to the third filter mounting hole 5. A disc-shaped first front sealing baffle 44 is installed outside the first nitrogen inlet, a disc-shaped first rear sealing baffle 45 is installed outside the first nitrogen outlet, a disc-shaped second front sealing baffle 54 is installed outside the second nitrogen inlet, and a disc-shaped second rear sealing baffle 55 is installed outside the second nitrogen outlet. Circular pipe flow channels are provided in the first front sealing baffle 44, the first rear sealing baffle 45, the second front sealing baffle 54, and the second rear sealing baffle 55. The circular pipe flow channels of the first front sealing baffle 44 and the first rear sealing baffle 45 are coaxial with the second filter installation hole 4. A first sealing valve 46 is provided in the circular pipe flow channel of the first front sealing baffle 44, and a second sealing valve 47 is provided in the circular pipe flow channel of the first rear sealing baffle 45. The second filter installation hole 4 and the first front sealing baffle 44, the first rear sealing baffle 45, the first sealing valve 46, and the second sealing valve 47 together form a closed cavity. The circular pipe flow passage of the second front sealing baffle 54 and the second rear sealing baffle 55 is coaxial with the third filter installation hole 5, a third sealing valve 56 is arranged in the circular pipe flow passage of the second front sealing baffle 54, and a fourth sealing valve 57 is arranged in the circular pipe flow passage of the second rear sealing baffle 55. The third filter installation hole 5, the second front sealing baffle 54, the second rear sealing baffle 55, the third sealing valve 56 and the fourth sealing valve 57 together form a closed cavity.

[0041] like Figure 3 As shown, a first pressure sensor 81 and a first temperature sensor 91 are respectively installed on both sides of the material inlet, and a second pressure sensor 82 and a second temperature sensor 92 are respectively installed on both sides of the material outlet.

[0042] Installation and working method of the multi-channel switching plunger sealed filter of the present invention:

[0043] Step 1: Prepare a filter with a circular layer combination structure, integrating functions such as mixing, pressure equalization, filtration, and gel removal. The number and structure of the mixing porous plates can be increased or decreased according to actual process needs, and the number and structure of the filter mesh can be improved and optimized according to actual process needs.

[0044] Step 2: Prepare the sliding sealing structure and modular symmetrical assembly structure of the plunger cylinder. Each structural unit cooperates tightly and reliably, the installation and disassembly are convenient and quick, and the parts have good interchangeability.

[0045] Step 3: Prepare the plunger cylinder sealing structure, which realizes the sealing function between the material and the environment under the premise of being able to move axially. Three identical filters are arranged in parallel, and the reciprocating actuator 7 controls the left and right reciprocating motion of the plunger sealing rod 2, so that the three filters can be freely switched under high-temperature working conditions.

[0046] Step 4: The filter adopts a docking assembly structure, and the clogged filter can be disassembled and cleaned while the production line is running, and then replaced with a new filter for standby. Repeated replacement can achieve uninterrupted spinning production and improve work efficiency.

[0047] Step 5: Transfer the mixing, filtering and pressure equalization functions realized by the spinning assembly to the filter. According to actual needs, increase the number of filtering layers and change the filtering type to improve its ability to filter impurities and delay the time of filter clogging.

[0048] Step 6: Start spinning production. The molten material before reaching the component has been repeatedly mixed in multiple mixing porous plates inside the filter, and impurities and gels have been filtered in the filter net, ensuring that the molten material reaching the entrance of the spinning component is evenly mixed and impurities and gels are filtered out cleanly, thereby improving the quality of the spun fiber, the consistency of fiber performance and the stability of the spinning process.

[0049] Step 7: When there are too many impurities in one of the filter channels and it is blocked, the reciprocating actuator 7 is used to control the working flow path of the molten material to switch to another normal filter channel, so that the production can continue without being affected by the filter blockage.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-channel switching plunger sealed filter, characterized in that: It comprises a plunger filter chamber (1), a plunger sealing rod (2) and a reciprocating actuator (7); The plunger sealing rod (2) is slidably arranged in the plunger filter cavity (1), the plunger sealing rod (2) is connected to the reciprocating actuator (7), a first filter (01), a second filter (02) and a third filter (03) are arranged in parallel in the plunger sealing rod (2), a pre-mixing porous plate and a post-mixing porous plate are arranged in the first filter (01), the second filter (02) and the third filter (03), a plurality of smooth circular holes are arranged in a circular array along the axial direction on the pre-mixing porous plate and the post-mixing porous plate, and a filter screen is arranged between the pre-mixing porous plate and the post-mixing porous plate.

2. A multi-channel switching plunger sealed filter according to claim 1, characterized in that: The plunger filter cavity (1) is formed by connecting a plurality of sections; the outer side of the plunger filter cavity (1) is a rectangular body structure, and the inner side of the plunger filter cavity (1) is a cylindrical hole structure.

3. A multi-channel switching plunger sealed filter according to claim 2, characterized in that: Heating sources are installed on two opposite sides of the outside of the plunger filter cavity (1), and one side of the plunger filter cavity (1) is connected to a support seat (6) via a flange.

4. A multi-channel switching plunger sealed filter according to claim 1, characterized in that: The plunger sealing rod (2) is provided with a first filter mounting hole (3), a second filter mounting hole (4) and a third filter mounting hole (5) in parallel, and the first filter mounting hole (3), the second filter mounting hole (4) and the third filter mounting hole (5) are all multi-stage variable diameter cylindrical hole structures; The first filter (01) is fixedly mounted in a first filter mounting hole (3) by means of fasteners, the second filter (02) is fixedly mounted in a second filter mounting hole (4) by means of fasteners, and the third filter (03) is fixedly mounted in a third filter mounting hole (5) by means of fasteners.

5. The multi-channel switching plunger sealed filter according to claim 1, characterized in that: A first pre-mixing porous plate (31) and a first post-mixing porous plate (32) are arranged in the first filter (01), and a first filter screen (33) is arranged between the first pre-mixing porous plate (31) and the first post-mixing porous plate (32); A second pre-mixing porous plate (41) and a second post-mixing porous plate (42) are arranged in the second filter (02), and a second filter screen (43) is arranged between the second pre-mixing porous plate (41) and the second post-mixing porous plate (42); A third pre-mixing porous plate (51) and a third post-mixing porous plate (52) are arranged in the third filter (03), and a third filter screen (53) is arranged between the third pre-mixing porous plate (51) and the third post-mixing porous plate (52).

6. A multi-channel switching plunger sealed filter according to claim 1, characterized in that: A material inlet, a material outlet, a first nitrogen inlet, a first nitrogen outlet, a second nitrogen inlet and a second nitrogen outlet are respectively provided on opposite sides of the plunger filter cavity (1); the material inlet and the material outlet are coaxially connected to the first filter mounting hole (3); the first nitrogen inlet and the first nitrogen outlet are coaxially connected to the second filter mounting hole (4); and the second nitrogen inlet and the second nitrogen outlet are coaxially connected to the third filter mounting hole (5).

7. A multi-channel switching plunger sealed filter according to claim 6, characterized in that: A first front sealing baffle (44) is installed on the outer side of the first nitrogen inlet, a first rear sealing baffle (45) is installed on the outer side of the first nitrogen outlet, a second front sealing baffle (54) is installed on the outer side of the second nitrogen inlet, and a second rear sealing baffle (55) is installed on the outer side of the second nitrogen outlet. Circular tube flow channels are provided in the first front sealing baffle (44), the first rear sealing baffle (45), the second front sealing baffle (54) and the second rear sealing baffle (55). The circular tube flow channels of the first front sealing baffle (44) and the first rear sealing baffle (45) are coaxial with the second filter installation hole (4), and the circular tube flow channels of the second front sealing baffle (54) and the second rear sealing baffle (55) are coaxial with the third filter installation hole (5).

8. A multi-channel switching plunger sealed filter according to claim 7, characterized in that: A first sealing valve (46) is arranged in the circular tube flow channel of the first front sealing baffle (44), a second sealing valve (47) is arranged in the circular tube flow channel of the first rear sealing baffle (45), a third sealing valve (56) is arranged in the circular tube flow channel of the second front sealing baffle (54), and a fourth sealing valve (57) is arranged in the circular tube flow channel of the second rear sealing baffle (55).

9. The multi-channel switching plunger sealed filter according to claim 6, characterized in that: A first pressure sensor (81) and a first temperature sensor (91) are respectively installed on both sides of the material inlet, and a second pressure sensor (82) and a second temperature sensor (92) are respectively installed on both sides of the material outlet.

10. A method for operating the multi-channel switchable plunger sealed filter according to any one of claims 1 to 9, characterized in that: include: The reciprocating actuator (7) controls the plunger sealing rod (2) to perform reciprocating motion, thereby realizing free switching of the first filter (01), the second filter (02) and the third filter (03) in a working state; When there are too many impurities inside a filter channel of the first filter (01), the second filter (02) and the third filter (03) and it is clogged, the working flow channel of the molten material is switched to another normal filtering channel through the control of the reciprocating actuator (7), and the clogged filter is disassembled and cleaned while the production line is running, and then a new filter is replaced for standby use.

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