Sand cup for spinning assembly, spinning assembly and assembling method

Abstract

The invention relates to a sand cup for a spinning assembly, the spinning assembly and an assembling method.The sand cup for the spinning assembly comprises a cup body, a fine sand filtering layer, a coarse sand filtering layer, a sand pressing net and a sand pressing block, and the mesh number of filtering sand in the coarse sand filtering layer is smaller than that of filtering sand in the fine sand filtering layer; the cup body is provided with a containing cavity with an opening in the top, the fine sand filtering layer, the coarse sand filtering layer and the sand pressing net are sequentially arranged in the containing cavity in a stacked mode from bottom to top, the sand pressing block is located above the sand pressing net, and filtering sand in the coarse sand filtering layer and filtering sand in the fine sand filtering layer are metal sand in an irregular three-dimensional shape. And after the pressure of the spinning assembly is increased in the later period, the metal sand is not prone to being broken, the retention time of the melt is shortened, cracking of the melt is reduced, and the spinnability is effectively improved. And two kinds of irregular three-dimensional metal sands with different thicknesses are adopted, so that the condition that the discharge hole of the sand cup is blocked by the metal sands is avoided.

Description

Technical Field

[0001] The present application relates to the field of spinning technology, and in particular to a sand cup for a spinning assembly, a spinning assembly and an assembly method. Background Art

[0002] In the spinning process of nylon 66 (PA66), a spinning assembly is required, which plays the role of pressurizing and filtering impurities. During the spinning process, the pressurization and filtration of the spinning assembly ensure that the spinning melt passes smoothly through the spinneret in the spinning assembly, ensuring the stability of spinning.

[0003] At present, some spinning components use sea sand for filtration, but there are the following defects: as the pressure of the spinning component increases, the sea sand is easily crushed, and the fine particles are easy to block the outlet holes of the spinneret, which is easy to cause floating and fuzzy fibers, and also leads to the problem of a short life of the spinning component. In addition, since sea sand has a poor filtering effect on gel, it is easy to cause gel particles to be generated, thus affecting the spinning condition.

[0004] Although some spinning components use metal sand for filtration, the metal sand has a poor shape, such as spherical or flat, so the specific surface area of ​​the metal sand is small, the porosity is small, and the bulk density is large, resulting in poor filtration effect. In addition, when only a single metal sand is used for filtration in the spinning component, in order to achieve the same filtration effect, the melt retention time will be long, causing degradation and having an adverse effect on the spinning condition. Some spinning components also have defects such as numerous filter screens, complex structures, troublesome assembly and disassembly, poor sealing effect, and easy leakage after being put into the machine. Summary of the invention

[0005] Based on this, it is necessary to provide a sand cup for a spinning assembly, which can improve the efficiency of melt filtration while avoiding clogging of subsequent spinnerets.

[0006] The present application provides a sand cup for a spinning component, comprising a cup body, a fine sand filter layer, a coarse sand filter layer, a sand pressing net and a sand pressing block, wherein the mesh number of the filter sand in the coarse sand filter layer is smaller than the mesh number of the filter sand in the fine sand filter layer, the cup body comprises a cavity with an open top, the fine sand filter layer, the coarse sand filter layer and the sand pressing net are sequentially stacked from bottom to top in the cavity, the sand pressing block is located above the sand pressing net, and the filter sand in the coarse sand filter layer and the fine sand filter layer are both metal sand in an irregular three-dimensional shape.

[0007] In one embodiment, a sintered felt is further included, and the sintered felt and the fine sand filter layer are stacked in sequence from bottom to top, and the mesh number of the sintered felt is greater than the mesh number of the metal sand in the fine sand filter layer.

[0008] In one embodiment, it further comprises a first metal mesh component for supporting at least the fine sand filter layer and the coarse sand filter layer, and the first metal mesh component and the sintered felt are sequentially stacked from bottom to top.

[0009] In one embodiment, the first metal mesh assembly includes a first metal mesh and a second metal mesh which are stacked in sequence from bottom to top, and the mesh number of the first metal mesh is smaller than the mesh number of the second metal mesh.

[0010] In one embodiment, the mesh number of the metal sand in the fine sand filter layer is 40-60 meshes, and the mesh number of the metal sand in the coarse sand filter layer is 20-40 meshes; or, the mesh number of the metal sand in the fine sand filter layer is 60-80 meshes, and the mesh number of the metal sand in the coarse sand filter layer is 40-60 meshes.

[0011] The present application also provides a spinning assembly for producing nylon 66 industrial yarn, comprising a shell, a spinneret, a sand cup and a cover body, wherein the sand cup is the sand cup described in any one of the above embodiments, the shell has an assembly cavity with upper and lower ends open, the spinneret is arranged in the assembly cavity and covers the lower end opening of the shell, the spinneret is covered with a metal fiber felt at least for stabilizing the flow of the melt, the sand cup is located above the metal fiber felt, the cover body is arranged in the shell and can cover the upper end opening of the shell, a feed port connected to the cavity of the sand cup is provided on the cover body; the sand pressing block is a guide plate for dispersing and guiding the melt flowing out of the feed port into the cavity; or, a guide plate for dispersing and guiding the melt flowing out of the feed port into the cavity is provided in the cover body.

[0012] In one embodiment, the metal fiber felt is 20-60 μm.

[0013] In one embodiment, the initial pressure P of the spinning assembly when it is in operation satisfies: 120 bar<P≤140 bar.

[0014] In one embodiment, a second metal mesh component for supporting the metal fiber felt is further disposed above the spinneret, and the second metal mesh component and the metal fiber felt are stacked in sequence from bottom to top.

[0015] In one embodiment, a first groove for accommodating a sealing ring is provided on the top surface of the spinneret, and the first groove is located at the periphery of the metal fiber felt. A second groove for accommodating the upper part of the sealing ring is provided on the bottom surface of the sand cup at a position corresponding to the first groove.

[0016] The present application also provides an assembly method for a spinning assembly, wherein the spinning assembly is the spinning assembly described above, a first metal mesh assembly is arranged in the cup body of the sand cup, and the assembly method sequentially comprises the following steps:

[0017] S1, placing a first metal mesh component and a sintered felt in the cavity of the cup body in sequence, wherein the first metal mesh component and the sintered felt are stacked from bottom to top, and then a press is used to flatten the stacked first metal mesh component and the sintered felt; then fine metal sand is spread on the top of the sintered felt to form a fine sand filter layer after flattening, and then coarse metal sand is spread on the top of the fine sand filter layer to form a coarse sand filter layer after flattening; then a press is used to flatten and take out, and then a sand pressing net and a sand pressing block are stacked in sequence on the top of the coarse sand filter layer to form a sand cup;

[0018] Step S2, place the shell on the assembly table, place the spinneret in the assembly cavity of the shell, the spinneret blocks the lower end opening of the assembly cavity, then place the second metal mesh assembly and the metal fiber felt in the assembly cavity in turn, then put in the metal sealing ring, then place the sand cup on top of the metal fiber felt, then place the cover body on the shell and block the upper end opening of the shell, and then use fixings to fix the cover body and the shell to form a spinning assembly.

[0019] Compared with the prior art, in the sand cup provided by the present application, the metal sand is in an irregular three-dimensional shape, and the raised edge of the metal sand can easily capture foreign matter in the melt and shear the melt gel, which greatly improves the filtration efficiency of the melt. The metal sand is in a three-dimensional shape, has a high porosity, a large specific surface area, a small bulk density of the metal sand, and is resistant to high pressure. After the pressure of the spinning assembly increases in the later stage, it is not easy to break, which reduces the residence time of the melt, reduces the cracking of the melt, and effectively improves the spinnability. In addition, since the metal sand is not easy to break, it is avoided to break into fine particles and block the subsequent spinneret, and then avoid the situation of floating silk and hairy silk. The use of two kinds of metal sands with different irregular three-dimensional shapes of different thicknesses reduces the residence time of the melt, can better filter the melt, and the metal sand is not easy to break and then does not flow with the melt, avoiding the situation that the metal sand blocks the discharge hole of the sand cup, and achieves a better filtering effect, further improves the problems of floating silk and hairy silk in the subsequent spinning production process, and achieves the purpose of reliable spinning. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A cross-sectional view of a spinning assembly according to an embodiment of the present application;

[0022] Figure 2 A cross-sectional view of a spinning assembly according to an embodiment of the present application;

[0023] Figure 3 A cross-sectional view of a stacked arrangement of a first metal mesh component, a fine sand filter layer, a coarse sand filter layer, and a sand pressing mesh according to an embodiment of the present application;

[0024] Figure 4 A cross-sectional view of a stacked arrangement of a second metal mesh component and a metal fiber felt according to an embodiment of the present application;

[0025] Figure 5 This is a graph showing the change in pressure applied to the spinning assembly over time in Example 4 of the present application.

[0026] Figure numerals: 1. sand cup; 10. metal sand filter layer; 11. cup body; 110. holding cavity; 12. fine sand filter layer; 13. coarse sand filter layer; 14. sand pressing net; 15. sand pressing block; 16. first metal mesh assembly; 161. first metal mesh; 162. second metal mesh; 17. sintered felt; 2. shell; 21. assembly cavity; 3. spinneret; 4. cover body; 41. feed port; 43. extension portion; 431. threaded hole; 5. metal fiber felt; 6. second metal mesh assembly; 61. third metal mesh; 62. fourth metal mesh; 7. sealing ring; 8. locking ring. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0028] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a centered component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a centered component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right", "side", "top", "bottom" and similar expressions used in the specification of this application are only used to describe the various example structural parts and elements of the present application, but these terms are used here only for the purpose of convenience of explanation, and are determined based on the example orientations shown in the accompanying drawings, and do not represent the only implementation method. Since the embodiments disclosed in the application can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0030] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0031] It should be noted that "axial arrangement" means that the overall arrangement direction is along the axial direction, including but not limited to axial extension, and may form an angle with the axial direction.

[0032] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0033] like Figure 1 to Figure 4The present application discloses a sand cup 1 for a spinning assembly. The sand cup 1 comprises a cup body 11, a fine sand filter layer 12, a coarse sand filter layer 13, a sand pressing net 14 and a sand pressing block 15. The fine sand filter layer 12 and the coarse sand filter layer 13 are defined as a metal sand filter layer 10. For details, see Figure 2 As shown. The mesh number of the filter sand in the coarse sand filter layer 13 is smaller than the mesh number of the filter sand in the fine sand filter layer 12. The cup body 11 has a cavity 110 with an open top, and the cup body 11 is usually provided with a discharge hole. The above-mentioned fine sand filter layer 12, coarse sand filter layer 13 and sand pressing net 14 are stacked in sequence from bottom to top in the cavity 110, and the sand pressing block 15 is located above the sand pressing net 14, that is, the sand pressing net 14 is located between the sand pressing block 15 and the coarse sand filter layer 13. The filter sand in the coarse sand filter layer 13 and the fine sand filter layer 12 are both metal sands with irregular three-dimensional shapes.

[0034] It is understandable that the above-mentioned metal sand adopts an irregular three-dimensional shape, and the raised edge of the metal sand can easily capture foreign matter in the melt and shear the melt gel, which greatly improves the filtration efficiency of the melt. The metal sand is three-dimensional, has a high porosity, a large specific surface area, a small bulk density of the metal sand, and is resistant to high pressure. After the pressure of the spinning assembly increases in the later stage, it is not easy to break, which reduces the residence time of the melt, reduces the cracking of the melt, and effectively improves the spinnability. Since the metal sand is not easy to break, it is avoided that it is broken into fine particles and blocks the subsequent spinneret 3, and then avoids the situation of floating silk and hairy silk. The use of two kinds of metal sands with different irregular three-dimensional shapes of different thicknesses reduces the residence time of the melt, can better filter the melt, and the metal sand is not easy to break and then does not flow with the melt, avoiding the situation that the metal sand blocks the discharge hole of the sand cup, and achieves a better filtering effect, so that the melt can pass through the subsequent spinneret smoothly, further improving the problems of floating silk and hairy silk in the subsequent spinning production process, and achieving the purpose of reliable spinning.

[0035] The above irregular three-dimensional shapes include pyramids, prisms, polyhedrons, etc. The above irregular three-dimensional shapes are non-flat, non-sheet, non-spherical or non-arc, etc.

[0036] like Figure 1 to Figure 3 As shown, the sand cup 1 further includes a sintered felt 17, and the sintered felt 17 and the fine sand filter layer 12 are stacked from bottom to top, that is, the metal sand filter layer 10 is located above the sintered felt 17. The mesh number of the sintered felt 17 is greater than the mesh number of the metal sand in the fine sand filter layer 12. It can be understood that the metal sand in the metal sand filter layer 10 initially filters the melt, and then the sintered felt 17 filters the melt again, which is conducive to improving the filtering effect of the melt.

[0037] In one embodiment, if Figure 1 to Figure 3As shown, the sand cup 1 further includes a first metal mesh component 16 for supporting at least the fine sand filter layer 12 and the coarse sand filter layer 13. The first metal mesh component 16 and the sintered felt 17 are stacked from bottom to top, that is, the sintered felt 17 is located above the first metal mesh component 16. It can be understood that the first metal mesh component 16 plays a good supporting role for the sintered felt 17, the coarse sand filter layer 13 and the fine sand filter layer 12, ensuring the flatness of the sintered felt 17, the coarse sand filter layer 13 and the fine sand filter layer 12, reducing the probability of deformation, which is conducive to ensuring the filtering effect of the melt, preventing melt residue to a certain extent, and playing a good effect on improving the spinning breakage rate.

[0038] In one embodiment, the first metal mesh assembly 16 includes a first metal mesh 161 and a second metal mesh 162 which are stacked from bottom to top, that is, the second metal mesh 162 is located above the first metal mesh 161. The mesh number of the first metal mesh 161 is smaller than the mesh number of the second metal mesh 162. The arrangement of the first metal mesh assembly can support the fine sand filter layer 12 and the coarse sand filter layer 13 while allowing the melt to pass through to prevent the melt from remaining.

[0039] In one embodiment, the mesh number of the metal sand in the fine sand filter layer 12 is 40-60 meshes, and the mesh number of the metal sand in the coarse sand filter layer 13 is 20-40 meshes; or, the mesh number of the metal sand in the fine sand filter layer 12 is 60-80 meshes, and the mesh number of the metal sand in the coarse sand filter layer 13 is 40-60 meshes. When the mesh number of the metal sand is too large, such as greater than 80 meshes, the spinning melt passes slowly, and the residence time in the spinning assembly is too long, which is easy to cause melt cracking, and the pressure of the spinning assembly is too high in the later stage, and spinning cannot be performed. When the mesh number of the metal sand is too small, such as less than 20 meshes, the filtering effect is poor, and the impurities in the spinning melt cannot be filtered out, which will block the outlet hole of the spinneret and cause broken wires. Therefore, the above two mesh matching methods are adopted to achieve spinning while avoiding broken wires, and obtain better spinning effects.

[0040] The present application also discloses a spinning assembly. The spinning assembly is used to produce nylon 66 industrial yarn. The aforementioned spinning assembly includes a shell 2, a spinneret 3, a sand cup 1 and a cover 4. The shell 2 has an assembly cavity 21 with both upper and lower ends open, the spinneret 3 is arranged in the assembly cavity 21, and covers the lower end opening of the shell 2, the spinneret 3 is covered with a metal fiber felt 5 at least for stabilizing the melt flow, the sand cup 1 is located above the metal fiber felt 5, the cover 4 is arranged on the shell 2, and can cover the upper end opening of the shell 2, and the cover 4 is provided with a feed port 41 connected to the cavity 110 of the sand cup 1.

[0041] In one embodiment, a guide plate is provided in the cover body 4 for dispersing and guiding the melt flowing out of the feed port 41 into the cavity 110. In this way, the guide plate can disperse and guide the melt, so that the melt quickly spreads to the surroundings and flows evenly into the sand cup 1. In this embodiment, the above-mentioned sand pressing block 15 is also a guide plate for dispersing and guiding the melt flowing out of the feed port 41 into the cavity 110. In other words, the sand pressing block 15 can not only press the sand pressing net and the metal sand filter layer below, but also disperse and guide the melt.

[0042] It is understandable that after the melt is filtered through the coarse sand filter layer and the fine sand filter layer of the sand cup 1, before entering the spinneret 3 for spinning, the sintered metal fiber felt 5 arranged above the spinneret 3 not only filters the melt again, but also plays the role of equalizing pressure and stabilizing flow, that is, if the melt directly enters the spinneret 3 after exiting the sand cup 1, the unstable fluidity of the melt will cause the spinneret 3 to produce unstable wires. The above-mentioned metal fiber felt 5 makes the melt fluidity more stable, thereby making the spinneret 3 produce wires more stable and avoiding wire breakage. In addition, since the metal sintered felt has a three-dimensional mesh porous structure, that is, it has the characteristics of high porosity, large surface area and high compressive resistance, it will make the melt pass quickly without dead corners, and will filter the melt better. Therefore, the above-mentioned spinning assembly can filter the melt better by matching the two kinds of metal sands of different coarseness and fineness with the metal fiber felt 5, etc., avoid the generation of dead corners, reduce the wire breakage rate, and achieve a better wire production effect.

[0043] When the melt enters from the feed port 41 of the cover body 4, it is dispersed by the guide plate, quickly diffuses to the surroundings and flows evenly into the sand cup 1. Figure 3 As shown, since the coarse sand filter layer 13, the fine sand filter layer 12, the sintered felt 17 and the first metal mesh assembly 16 are arranged in sequence from top to bottom, the melt in the sand cup 1 flows out through the coarse sand filter layer 13, the fine sand filter layer 12, the sintered felt 17 and the first metal mesh assembly 16 in sequence, and the melt flowing out of the sand cup 1 passes through the metal fiber felt 5 and finally passes through the spinneret 3 to produce wire.

[0044] In this embodiment, the metal fiber felt 5 has a thickness of 20 to 60 μm.

[0045] In one embodiment, a second metal mesh component 6 for supporting the metal fiber felt 5 is further provided above the spinneret 3, and the second metal mesh component 6 and the metal fiber felt 5 are stacked from bottom to top. It can be understood that the second metal mesh component 6 provides better support for the metal fiber felt 5, ensuring that the metal fiber felt 5 is flat and not easily deformed.

[0046] In one embodiment, the second metal mesh assembly 6 includes a third metal mesh 61 and a fourth metal mesh 62 which are stacked from bottom to top, that is, the fourth metal mesh 62 is located above the third metal mesh 61. The mesh number of the third metal mesh 61 is 10 meshes, and the mesh number of the fourth metal mesh 62 is 60 meshes. After flowing out of the sand cup 1, the melt passes through the metal fiber felt 5, the fourth metal mesh 62 and the third metal mesh 61 in sequence, and then passes through the spinneret 3 to produce filaments.

[0047] In one embodiment, a circle of first grooves for accommodating the sealing ring 7 is provided on the top surface of the spinneret 3, and the first grooves are located at the periphery of the metal fiber felt 5. A circle of second grooves for the upper part of the sealing ring 7 to be inserted is provided on the bottom surface of the sand cup 1 at a position corresponding to the first groove. The existence of the first groove and the second groove can better place the sealing ring 7, and the existence of the sealing ring 7 can avoid leakage of slurry in the spinning assembly during operation, improve the sealing effect, and help ensure production efficiency.

[0048] like Figure 1 and Figure 2 As shown, the top of the cover body 4 has an extension portion 43 extending upward, and a threaded hole 431 is formed on the extension portion 43. The feed port 41 is located below the threaded hole 431 and communicates with the threaded hole 431. A locking ring 8 threadedly connected to the inner circumferential wall of the shell 2 is sleeved between the shell 2 and the extension portion 43, and the locking ring 8 and the cover body 4 have corresponding connection holes threadedly connected to the bolts.

[0049] The present application also discloses an assembly method of the above spinning assembly. The assembly method comprises the following steps in sequence:

[0050] S1. Place the first metal mesh component 16 and the sintered felt 17 in the cavity 110 of the cup body 11 in sequence. The first metal mesh component 16 and the sintered felt 17 are stacked from bottom to top. At this time, the sintered felt 17 is located above the first metal mesh component 16. Then, a press is used to flatten the stacked first metal mesh component 16 and the sintered felt 17. Then, fine metal sand is spread on the top of the sintered felt 17 to form a fine sand filter layer 12 after flattening. Then, coarse metal sand is spread on the top of the fine sand filter layer 12 to form a coarse sand filter layer 13 after flattening. Then, a press is used to flatten and take out. Then, a sand pressing net 14 and a sand pressing block 15 are stacked in sequence on the top of the coarse sand filter layer 13 to form a sand cup 1.

[0051] Step S2, placing the housing 2 on the assembly table, placing the spinneret 3 in the assembly cavity 21 of the housing 2, the spinneret 3 blocking the lower end opening of the assembly cavity 21, then placing the second metal mesh assembly 6 and the metal fiber felt 5 in the assembly cavity 21 in sequence, at this time, the metal fiber felt 5 is located above the second metal mesh assembly 6, then placing the metal sealing ring 7, then placing the sand cup 1 above the metal fiber felt 5, then placing the cover 4 on the housing 2, and blocking the upper end opening of the housing 2, and then using a fixing member to fix the cover 4 and the housing 2 to form a spinning assembly. The aforementioned fixing member is a bolt.

[0052] Step S3, connect the threaded holes 431 with long bolts, lift them upward, separate the spinning assembly from the assembly table, move the spinning assembly under the press, replace the bolts, and then put the pressure block on to press the spinning assembly according to the set pressure.

[0053] Step S4, then tighten and loosen the press with a special tool, screw the bolts into the cover 4, and finally make a record on the spinning assembly and move it to the designated area.

[0054] The initial pressure P of the spinning assembly when it is put into operation satisfies: 120 bar < P ≤ 140 bar. Within this initial pressure range, the spinning assembly can maintain a good filtering effect.

[0055] The following specific examples will further illustrate the mesh size of the coarse sand filter layer 13 and the metal sand in the fine sand filter layer 12 in step S1, the metal fiber felt 5, and the initial pressure of the spinning assembly in step S3. However, those skilled in the art will understand that the following examples are only used to illustrate the present invention and should not be considered to limit the scope of the present invention.

[0056] In the present application, the metal sand in the coarse sand filter layer 13 is defined as coarse metal sand, and the metal sand in the fine sand filter layer 12 is defined as fine metal sand.

[0057] Embodiment 1:

[0058] In the above-mentioned spinning assembly assembly method, step S1 is to sequentially place a 10-mesh first metal mesh 161, a 60-mesh second metal mesh 162, and a 400-mesh sintered felt 17 in the cavity 110 of the cup body 11. At this time, the 10-mesh first metal mesh 161, the 60-mesh second metal mesh 162, and the 400-mesh sintered felt 17 are sequentially stacked from bottom to top; then, a press machine is used to press the stacked 10-mesh first metal mesh 161, the 60-mesh second metal mesh 162, and the 400-mesh sintered felt 17 at a pressure of 20 MPa. 00 mesh sintered felt 17 is flattened; then 800g of 40-60 mesh fine metal sand is spread on the top of 400 mesh sintered felt 17 to form a fine sand filter layer 12 after flattening, and then 800g of 20-40 mesh coarse metal sand is spread on the top of the fine sand filter layer 12 to form a coarse sand filter layer 13 after flattening; then a press is used to flatten it at a pressure of 25MPa and then taken out, and then a 60-mesh sand pressing net 14 is stacked in sequence on the top of the coarse sand filter layer 13, and then a sand pressing block 15 is placed, so as to form a sand cup 1;

[0059] Step S2, place the shell 2 on the assembly table, place the spinneret 3 in the assembly cavity 21 of the shell 2, the spinneret 3 blocks the lower end opening of the assembly cavity 21, and then place the 10-mesh third metal mesh 61 and the 60-mesh fourth metal mesh 62 in the assembly cavity 21 in sequence, and then put in the 20μm metal fiber felt 5. At this time, the 10-mesh third metal mesh 61, the 60-mesh fourth metal mesh 62 and the 20μm metal fiber felt 5 are stacked in sequence from bottom to top, and then the sealing ring 7 is placed, and then the sand cup 1 is placed above the metal fiber felt 5, and then the cover body 4 is placed on the shell 2 and blocks the upper end opening of the shell 2, and then the cover body 4 and the shell 2 are fixed with bolts to form a spinning assembly.

[0060] When the spinning assembly is put into use, the starting pressure of the spinning assembly is 100 bar.

[0061] Embodiment 2:

[0062] Compared with the above-mentioned embodiment 1, the difference of this embodiment is that: in step S2, the metal fiber felt 5 put in is 60 μm; when the spinning assembly is put into use, the initial pressure of the spinning assembly is 90 bar.

[0063] Embodiment 3:

[0064] Compared with the above-mentioned embodiment 1, the difference of this embodiment is that in step S2, the fine metal sand is 60-80 meshes spread on the 400-mesh sintered felt 17; the coarse metal sand is 40-60 meshes spread on the fine sand filter layer 12. When the spinning assembly is put into use, the initial pressure of the spinning assembly is 140 bar.

[0065] Embodiment 4:

[0066] Compared with the above-mentioned embodiment 1, the difference of this embodiment is that in step S2, the fine metal sand is 60-80 mesh on the top of the 400-mesh sintered felt 17; the coarse metal sand is 40-60 mesh on the top of the fine sand filter layer 12; the metal fiber felt 5 is 60 μm. When the spinning assembly is put into use, the initial pressure of the spinning assembly is 131 bar.

[0067] Embodiment 5:

[0068] Compared with the above-mentioned embodiment 1, the difference of this embodiment is that: in step S2, 1000g of fine metal sand with a mesh size of 60-80 is spread on the top of the 400-mesh sintered felt 17; 600g of coarse metal sand with a mesh size of 40-60 is spread on the top of the fine sand filter layer 12, and the metal fiber felt 5 with a mesh size of 30μm is placed. When the spinning assembly is put into use, the initial pressure of the spinning assembly is 152bar.

[0069] Embodiment 6:

[0070] Compared with the above-mentioned embodiment 1, the difference of this embodiment is that: in step S2, 1000g of fine metal sand is spread on the top of the 400-mesh sintered felt 17, and the fine metal sand is 60-80 mesh; 600g of coarse metal sand is spread on the top of the fine sand filter layer 12, and the coarse metal sand is 40-60 mesh, and the metal fiber felt 5 placed therein is 40μm. When the spinning assembly is put into use, the starting pressure of the spinning assembly is 148bar.

[0071] Comparative Example 1:

[0072] The only difference from the above-mentioned embodiment 1 is that it only includes a fine sand filter layer, that is, it only contains a single metal sand. Specifically, only 1600g of spherical or flat fine metal sand of 40 to 60 meshes is spread on the top of the 400-mesh sintered felt 17.

[0073] Comparative Example 2:

[0074] The only difference from the above-mentioned embodiment 4 is that it only includes a fine sand filter layer, that is, it only contains a single metal sand, specifically, only 1600g of 60-80 mesh fine metal sand is spread on the top of the 400 mesh sintered felt 17. When the spinning assembly is put into use, the initial pressure of the spinning assembly is 180 bar.

[0075] The parameters of the mesh size of the metal sand, the metal fiber felt 5 and the initial pressure of the spinning assembly selected in the above-mentioned embodiments and comparative examples are specifically shown in the table below.

[0076]

[0077] It can be seen from the above table that: from the above Example 1 and Comparative Example 1, when a combination of two metal sands of 20-40 mesh and 40-60 mesh is used, or when only a single specification of metal sand of 40-60 mesh is used, the initial pressure of the spinning assembly when it is put on the machine is low, and the filtering effect is not good, such as an increase in broken wires.

[0078] From the above Example 4 and Comparative Example 2, it can be seen that after using two types of metal sand in combination, the filtration capacity of the sand cup is better. When using a sand cup with a single specification of 60-80 mesh metal sand, the initial pressure of the spinning assembly on the machine will be too high, affecting the filtration effect. It can be seen that when two types of metal sand with appropriate specifications are used and the initial pressure when being put on the machine is good (i.e., neither too high nor too low), the spinning assembly can achieve a better spinning effect.

[0079] It can be seen from Example 1, Example 2 and Example 4 that when the spinning assembly is used on the machine, the initial pressure of Example 1 and Example 2 is low, and the filtration effect of the melt passing through the sand cup is poor, which is not conducive to spinning. When Example 4 is used on the machine, the initial pressure is appropriate, the use effect is better, and the spinning effect is better. It can be seen from Example 4 and Comparative Example 2 that when a sand cup with a single specification of 60-80 mesh metal sand is used, the initial pressure of the spinning assembly on the machine will be high, affecting the filtration effect.

[0080] In addition, in order to improve the strength of the metal sand and ensure that it does not deform under high pressure, nickel, chromium, manganese and other components are usually added to the metal sand. As the pressure of the spinning assembly increases, it will not be broken or fine powder will be generated to block the spinneret. The melt is more stable, the life of the spinning assembly is extended, and the production cost is reduced. The above-mentioned metal sand uses any metal sand suitable for nylon 66 melt filtration, such as SP800.

[0081] like Figure 5 It can be seen that in the first three weeks, the pressure of the spinning assembly of Example 4 only rose by 17.8 bar. The metal sand is not easy to break and has high compressive strength. As the use time increases, the impurities filtered by the sand cup accumulate continuously, and the pressure rise of the spinning assembly gradually accelerates. On the 45th day, the pressure of the spinning assembly was 245.8 bar. On the 46th day, the pressure of the spinning assembly was 255.4 bar. The pressure rise was slow in the later period, and the number of broken wires also began to increase. It can be judged that the impurities filtered by the spinning assembly accumulated too much, affecting the filtering effect, and the machine was arranged to be taken off the machine. In other words, when the filtering effect is not good, the broken wires will increase and the spinning effect is not good.

[0082] Therefore, the above spinning assembly selects a suitable initial pressure when it is used on the machine, the pressure rise of the spinning assembly is stable and slow, and the service life of the spinning assembly can reach 45 days, which greatly prolongs the life of the spinning assembly, reduces the production cost of nylon 66 industrial yarn, and improves production efficiency. That is to say, when the spinning assembly of the present application is used on the machine, when the initial pressure is appropriate, the spinning effect is good and the service life is long.

[0083] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0084] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A sand cup for a spinning assembly, characterized in that: It includes a cup body, a fine sand filter layer, a coarse sand filter layer, a sand pressing net and a sand pressing block. The mesh number of the filter sand in the coarse sand filter layer is smaller than the mesh number of the filter sand in the fine sand filter layer. The cup body has a cavity with an open top. The fine sand filter layer, the coarse sand filter layer and the sand pressing net are stacked in sequence from bottom to top in the cavity. The sand pressing block is located above the sand pressing net. The filter sand in the coarse sand filter layer and the fine sand filter layer are both metal sand in irregular three-dimensional shape.

2. The sand cup according to claim 1, characterized in that: It also includes sintered felt, which is stacked with the fine sand filter layer in sequence from bottom to top, and the mesh number of the sintered felt is greater than the mesh number of the metal sand in the fine sand filter layer.

3. The sand cup according to claim 2, characterized in that: It also includes a first metal mesh component at least for supporting the fine sand filter layer and the coarse sand filter layer. The first metal mesh component and the sintered felt are stacked in sequence from bottom to top.

4. The sand cup according to claim 3, characterized in that: The first metal mesh assembly includes a first metal mesh and a second metal mesh which are stacked in sequence from bottom to top, and the mesh number of the first metal mesh is smaller than the mesh number of the second metal mesh.

5. The sand cup according to any one of claims 1 to 4, characterized in that: The mesh number of the metal sand in the fine sand filter layer is 40-60 meshes, and the mesh number of the metal sand in the coarse sand filter layer is 20-40 meshes; or, the mesh number of the metal sand in the fine sand filter layer is 60-80 meshes, and the mesh number of the metal sand in the coarse sand filter layer is 40-60 meshes.

6. A spinning assembly for producing nylon 66 industrial yarn, comprising a housing, a spinneret, a sand cup and a cover, characterized in that: The sand cup is the sand cup as described in any one of claims 1 to 5, the shell has an assembly cavity which is open at both upper and lower ends, the spinneret is arranged in the assembly cavity and covers the lower end opening of the shell, the spinneret is covered with a metal fiber felt which is at least used for stabilizing the flow of the melt, the sand cup is located above the metal fiber felt, the cover body is arranged on the shell and can cover the upper end opening of the shell, a feed port connected to the cavity of the sand cup is provided on the cover body; the sand pressing block is a guide plate used to disperse and guide the melt flowing out of the feed port into the cavity; or, a guide plate is provided in the cover body to disperse and guide the melt flowing out of the feed port into the cavity.

7. The spinning assembly according to claim 6, characterized in that The metal fiber felt is 20 to 60 μm.

8. The spinning assembly according to claim 6, characterized in that A second metal mesh component for supporting the metal fiber felt is also arranged above the spinneret, and the second metal mesh component and the metal fiber felt are stacked in sequence from bottom to top.

9. The spinning assembly according to claim 6, characterized in that: The top surface of the spinneret is provided with a first groove for accommodating a sealing ring, the first groove is located at the periphery of the metal fiber felt, and the bottom surface of the sand cup is provided with a second groove for the upper part of the sealing ring to be inserted into at a position corresponding to the first groove.

10. The spinning assembly according to claim 6, characterized in that The initial pressure P of the spinning assembly when it is put into operation satisfies: 120 bar<P≤140 bar.

11. A method for assembling a spinning assembly, characterized in that: The spinning assembly is the spinning assembly according to claim 6, a first metal mesh assembly is arranged in the cup body of the sand cup, and the assembly method comprises the following steps in sequence: S1, placing a first metal mesh component and a sintered felt in the cavity of the cup body in sequence, wherein the first metal mesh component and the sintered felt are stacked from bottom to top, and then a press is used to flatten the stacked first metal mesh component and the sintered felt; then fine metal sand is spread on the top of the sintered felt to form a fine sand filter layer after flattening, and then coarse metal sand is spread on the top of the fine sand filter layer to form a coarse sand filter layer after flattening; then a press is used to flatten and take out, and then a sand pressing net and a sand pressing block are stacked in sequence on the top of the coarse sand filter layer to form a sand cup; Step S2, place the shell on the assembly table, place the spinneret in the assembly cavity of the shell, the spinneret blocks the lower end opening of the assembly cavity, then place the second metal mesh assembly and the metal fiber felt in the assembly cavity in turn, then put in the metal sealing ring, then place the sand cup on top of the metal fiber felt, then place the cover body on the shell and block the upper end opening of the shell, and then use fixings to fix the cover body and the shell to form a spinning assembly.

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