Filter device of fiber melt spinning machine

Abstract

The utility model discloses a filter device of a fiber melt spinning machine, which is characterized by comprising a metal sintering net filter element, a metal wire net fixedly arranged at the top of the metal sintering net filter element and metal sand filled in the metal sintering net filter element, a fixing ring is clamped at the top of the metal sintering net filter element, and the metal sintering net filter element is fixed on the fixing ring. The fixing ring is hollow, the metal wire mesh is clamped on the fixing ring, and the bottom of the fixing ring is clamped at the top of the metal sintered mesh filter element; according to the filtering device, a triple filtering mode is adopted, before polycarbosilane enters the spinneret plate, layered filtering is formed, large-particle impurities are effectively removed, the filtering effect is ensured, the metal sand plays a role in defoaming while filtering is conducted, the problem that the spinneret plate is blocked by a polycarbosilane macromolecular structure is effectively solved, and the filtering effect is improved. The continuity of the spinning length and the quality of produced fibers can be guaranteed, and stable proceeding of subsequent procedures is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of melt spinning filters, in particular to a filter device for a fiber melt spinning machine. Background Art

[0002] The current preparation method of silicon carbide (SiC) fiber is mainly an organic precursor conversion method: the precursor polycarbosilane (PCS) is loaded into a heating axe (or heating chamber) for stirring and preheating to become a molten state, and the polycarbosilane is heated and stirred in the heating kettle to remove the corresponding small molecules and a part of the waste gas, and heated and stirred to the specified degassing temperature under vacuum conditions, and then reaches the spinneret through a transmission pipeline and a metering pump, and is extruded from the holes of the spinneret.

[0003] However, in the process of volatilization and removal of small molecular weight polycarbosilane, the non-volatile polycarbosilane molecules remove H2 and CH4 to produce condensation cross-linking to form large molecular weight polycarbosilane. After further reaction, large particles will be precipitated. In other words, large particles will be produced after further reaction. During the spinning process, some of the larger particles will block the holes of the spinneret, resulting in the inability of the corresponding holes to continue to produce silk; another part of the large particles will make the spun silk easy to break, limiting the length of spinning. Finally, some large particles are successfully melt-spun, but in the subsequent pyrolysis process, due to the uneven molecular weight distribution and large volatile content, the formed fibers have many defects, affecting the performance of the final fibers. In addition, another major reason for the interruption of spinning is the bubbles in the polymer solution, which are mainly generated during the preparation and melt stirring of the polymer solution.

[0004] In view of this, the applicant has conducted in-depth research on the above-mentioned problem and proposed a fiber melt spinning machine filtering device to solve the problem that the macromolecular structure generated in the polycarbosilane spinning process in the prior art affects its own performance and blocks the spinneret holes. Utility Model Content

[0005] The utility model aims to provide a fiber melt spinning machine filtering device which has a simple structure, can effectively prevent the polycarbosilane macromolecular structure from clogging the spinneret hole, and has a long service life.

[0006] In order to achieve the above object, the utility model adopts the following technical solution:

[0007] A fiber melt spinning machine filter device comprises a metal sintered mesh filter element, a metal wire mesh fixedly arranged on the top of the metal sintered mesh filter element, and metal sand filled in the metal sintered mesh filter element, wherein a fixing ring is clamped on the top of the metal sintered mesh filter element, the fixing ring is hollow, the metal wire mesh is clamped on the fixing ring, and the bottom of the fixing ring is clamped on the top of the metal sintered mesh filter element.

[0008] Further, the fixing ring includes a clamping portion at the bottom and a placement portion fixedly arranged on the top of the clamping portion, the outer diameter of the placement portion is larger than the outer diameter of the clamping portion, the inner diameter of the placement portion is larger than the inner diameter of the clamping portion, the outer wall protrusion of the clamping portion is provided with a clamping ring, and the top of the metal sintered mesh filter element is provided with a clamping groove for the clamping ring to be inserted.

[0009] Furthermore, a fixing ring for fixing the metal mesh is protruded from the inner wall of the placement portion, and the inner diameter of the fixing ring is smaller than the diameter of the metal mesh.

[0010] Furthermore, the metal wire mesh is a stainless steel wire mesh.

[0011] Furthermore, the metal sand is stainless steel sand.

[0012] Furthermore, the metal sintered mesh filter element includes two or more filter element layers.

[0013] By adopting the above-mentioned design scheme, the beneficial effects of the utility model are:

[0014] Small molecules have been effectively removed from polycarbosilane during the heating and stirring process of the heating axe. After coming out of the discharge port of the heating axe and passing through the filtering device of the utility model, it first passes through the metal wire mesh for the first filtration, then passes through the internal metal sand for the second filtration, and finally flows out from the four sides of the metal sintered mesh filter element to achieve the third filtration, and is transported to the spinneret via a transmission pipeline; the filtering device of the utility model uses a triple filtration method, and before the polycarbosilane enters the spinneret, a layered filtration is formed, which effectively removes large particle impurities and ensures the filtration effect. The metal sand also plays a defoaming role while filtering, which effectively avoids the problem of polycarbosilane macromolecular structure clogging the spinneret, can ensure the continuity of the spinning length and the quality of the produced fiber, and is conducive to the stable progress of subsequent processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the decomposition of the filter device of the present invention.

[0016] Figure 2 It is a schematic diagram of the combination of the filtering device of the utility model.

[0017] Figure 3 It is a cross-sectional schematic diagram of the combination of the filter device of the utility model.

[0018] Figure 4 This is a schematic diagram of the utility model in which the filtering device is installed at the discharge port of the heating axe.

[0019] In the figure:

[0020] 1-Metal sintered mesh filter element; 10-Heating axe;

[0021] 11- card groove;

[0022] 2-wire mesh; 20-transmission pipeline;

[0023] 3-metal sand; 30-spinneret;

[0024] 4-fixing ring; 41-clamping part;

[0025] 42-placing portion; 411-locking ring;

[0026] 421-Retaining ring. DETAILED DESCRIPTION

[0027] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0028] like Figures 1 to 4 As shown, a fiber melt spinning machine filtering device comprises a metal sintered mesh filter element 1, a metal wire mesh 2 fixedly arranged on the top of the metal sintered mesh filter element 1, and metal sand 3 filled in the metal sintered mesh filter element 1, a fixing ring 4 is clamped on the top of the metal sintered mesh filter element 1, the fixing ring 4 is hollow, the metal wire mesh 4 is clamped on the fixing ring 4, and the bottom of the fixing ring 4 is clamped on the top of the metal sintered mesh filter element 1;

[0029] Specifically, the fixing ring 4 includes a clamping portion 41 at the bottom and a placement portion 42 integrally formed at the top of the clamping portion 41. The outer diameter of the placement portion 42 is larger than the outer diameter of the clamping portion 41, and the inner diameter of the placement portion 42 is larger than the inner diameter of the clamping portion 41, so that a space for placing the metal wire mesh 4 is formed between the top of the clamping portion 41 and the placement portion 42. A fixing ring 421 for fixing the metal wire mesh 2 is convexly provided on the inner wall of the placement portion 42. The inner diameter of the fixing ring 421 is smaller than the diameter of the metal wire mesh 2. When in use, the metal wire mesh 2 can be pressed into the placement portion 42 from the top of the fixing ring 4, so that the bottom of the metal wire mesh 2 is placed on the top of the clamping portion 41. The metal wire mesh 2 2 is pressed against the bottom of the fixing ring 421. Accordingly, in actual use, the position of the fixing ring 421 needs to match the thickness of the metal wire mesh 2, so that the metal wire mesh 2 can be pressed into the placement portion 42 and clamped at the bottom of the fixing ring 421; the outer wall protrusion of the clamping portion 41 is provided with a clamping ring 411, and the top of the metal sintered mesh filter element 1 is provided with a clamping groove 11 for inserting the clamping ring 411. Accordingly, the outer diameter of the clamping portion 41 is smaller than the inner diameter of the top of the metal sintered mesh filter element 1. The clamping portion 41 can be inserted from the top of the metal sintered mesh filter element 1 and is clamped and fixed by the cooperation of the clamping ring 411 and the clamping groove 11.

[0030] When in use, the filter device of the utility model can be installed at the bottom of the discharge port of the heating axe 10 in the conventional spinning machine in the art. The installation method can adopt the conventional method available in the art. In the utility model, the filter device is preferably mounted at the discharge port of the heating axe 10 and located in the transmission pipeline 20. Specifically, Figure 4 As shown, the top of the metal sintered mesh filter element 1 is clamped on the discharge port of the heating axe 10 (the filter device and the heating axe 10 can be fixed by setting conventional fasteners), and other conventional installation methods can also be used according to the actual needs of the operator, which will not be described in detail in this utility model;

[0031] The small molecules of polycarbosilane have been effectively removed during the heating and stirring process of the heating axe 10. After coming out of the discharge port of the heating axe 10 and passing through the filtering device of the utility model, it first passes through the metal mesh 2 for the first filtration, then passes through the internal metal sand 3 for the second filtration, and finally flows out from the surroundings of the metal sintered mesh filter element 1 to achieve the third filtration, and is transported to the spinneret 30 through the transmission pipeline 20; the filtering device of the utility model uses a triple filtration method, and before the polycarbosilane enters the spinneret 30, a hierarchical filtration is formed, which effectively removes large particle impurities, ensures the filtering effect, and effectively avoids the problem of polycarbosilane macromolecular structure clogging the spinneret;

[0032] The metal wire mesh 2 and the metal sintered mesh filter element 1 in the utility model mainly play a filtering role. In the process of volatilization and removal of the small molecular structure polycarbosilane in the heating axe, the small molecule removal and stirring will produce corresponding bubbles, which need to be vacuum degassing treatment. However, if the bubbles cannot be completely removed, it will have an adverse effect on the subsequent fiber spinning length or fiber performance. The metal sand 3 of the utility model can also play a defoaming role while filtering, which can ensure the continuity of the spinning length and the quality of the produced fiber, and is conducive to the stable progress of the subsequent processes.

[0033] In the present utility model, the metal sand 3 is preferably made of 316 stainless steel sand, and the metal wire mesh 2 is preferably made of 316 stainless steel wire mesh. The use of 316 stainless steel material can resist corrosion and oxidation, can be cleaned, can be used multiple times, and has a long service life; the number of filter core layers of the metal sintered mesh filter element 1 is preferably two or more layers, and the metal sintered mesh filter element 1 is preferably made of 316 stainless steel sintered mesh. The multi-layer 316 stainless steel mesh is subjected to special lamination pressing and vacuum sintering to form a new type of filter material with high strength and overall rigidity. The mesh holes of each layer of the wire mesh are staggered with each other. After sintering, the 316 stainless steel wire mesh has extremely high mechanical strength and compressive strength, heat resistance and corrosion resistance, can be cleaned, can be used multiple times, has a long service life, and can achieve better filtering effect. At the same time, the filtering device of the present utility model is simple to assemble and has a long service life.

[0034] Polycarbosilane successfully removes small molecules and performs degassing treatment during the melting process. When passing through the filter device of the utility model, it can effectively filter and degas large molecular particles, effectively avoiding the problem of polycarbosilane macromolecular structure blocking the spinneret. Therefore, in the subsequent spinning process, the molecular weight distribution is uniform, the volatile matter is small, and the defects formed are small, which ultimately makes the fiber have excellent performance.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fiber melt spinning machine filter device, characterized in that: It includes a metal sintered mesh filter element, a metal wire mesh fixedly arranged on the top of the metal sintered mesh filter element, and metal sand filled in the metal sintered mesh filter element. The top of the metal sintered mesh filter element is clamped with a fixing ring, the fixing ring is hollow, the metal wire mesh is clamped on the fixing ring, and the bottom of the fixing ring is clamped on the top of the metal sintered mesh filter element.

2. A fiber melt spinning machine filter device according to claim 1, characterized in that: The fixing ring includes a clamping portion at the bottom and a placing portion fixed on the top of the clamping portion, the outer diameter of the placing portion is larger than the outer diameter of the clamping portion, the inner diameter of the placing portion is larger than the inner diameter of the clamping portion, a clamping ring is provided on the outer wall protrusion of the clamping portion, and a clamping groove for inserting the clamping ring is provided on the top of the metal sintered mesh filter element.

3. A fiber melt spinning machine filter device according to claim 2, characterized in that: A fixing ring for fixing the metal mesh is convexly provided on the inner wall of the placement portion, and the inner diameter of the fixing ring is smaller than the diameter of the metal mesh.

4. A fiber melt spinning machine filter device according to claim 1, characterized in that: The metal wire mesh is a stainless steel wire mesh.

5. A fiber melt spinning machine filter device according to claim 1, characterized in that: The metal sand is stainless steel sand.

6. A fiber melt spinning machine filter device according to claim 1, characterized in that: The metal sintered mesh filter element comprises two or more filter element layers.

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