Multi-position integrated coagulation stretcher

Abstract

The application discloses a multi-position integrated coagulation stenter, which comprises a mounting rack plate, a plurality of hydraulic jet stretching assemblies installed on the mounting rack plate and having a communication mixing channel and a high-pressure cavity, a high-pressure water pipe assembly comprising a high-pressure water main pipe and a plurality of high-pressure water branch pipes in communication, the high-pressure water branch pipes being in one-to-one correspondence with the high-pressure cavity, a low-pressure water distribution cavity arranged on the upper side of the mounting rack plate, the low-pressure water distribution cavity being an annular chamber surrounding the outer periphery of the mounting rack plate and having a plurality of liquid surface supplement water inlets distributed at intervals around the mounting rack plate, the inner peripheral side wall of the low-pressure water distribution cavity being a static pressure orifice plate with water outlet openings, and a low-pressure water pipe assembly comprising a low-pressure water main pipe and a plurality of low-pressure water branch pipes in communication, each low-pressure water branch pipe being in one-to-one correspondence with a liquid surface supplement water inlet. The application realizes more spinning positions arranged in a smaller space, guarantees the stability of a coagulation system and the uniform supply of multiple positions, and can reduce the equipment occupation area and the equipment investment cost.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of spinning equipment, and particularly relates to a multi-position integrated coagulation and drawing device. BACKGROUND

[0002] Drawing is an important process in the chemical fiber manufacturing process, and in the drawing process, molecular chains are arranged along the fiber axis to form a certain aggregate structure. In the existing fiber manufacturing technology, mechanical drawing is mainly used, supplemented by cooling medium setting, or occasionally bath liquid direct gravity drawing fiber forming technology. Cellulose fiber preparation mostly adopts dry jet wet spinning or wet spinning, and static immersion coagulation bath is the conventional choice for fiber double diffusion coagulation forming, but the relative motion friction between the fiber bundle and the coagulation bath is easy to cause damage to the nascent fiber, affecting the fiber quality, which also limits the improvement of the spinning speed and affects the industrialization efficiency. The waterfall type direct bath liquid gravity drawing cellulose fiber bundle forming technology uses the gravity of the coagulation bath liquid to flow down to form accelerated flow, and the fiber bundle flows out together under the traction of the coagulation bath liquid. The coagulation bath liquid flow speed is slow, the holding force on the fiber bundle is small, and a large height difference is needed to realize high speed, which is difficult to implement in industrialization. In addition, the stretching between the coagulation bath liquid flow and the fiber bundle is greatly affected by the water supply of the coagulation bath tank, and the water flow is difficult to stabilize and uniform. The cellulose fiber bundle is easy to be tangled together during the flow under gravity, so the technology cannot spin at high speed and is easy to form tangled fiber bundle, thereby affecting the fiber quality.

[0003] The Chinese patent with the application number 201610218051.0 discloses a coagulation bath acceleration device for high-speed spinning of para-aramid fiber and a matching high-speed spinning process, which is used to realize high-speed spinning of para-aramid fiber. However, the device has the problems of large occupied area and fewer spinning positions per unit space in the industrialization of high-speed continuous spinning of cellulose fiber. In addition, each spinning position needs to be controlled separately, which is easy to cause differences between positions, is cumbersome in industrial production management, has high cost, and is not suitable for the field of low-value civil textiles.

[0004] A cellulose spinning coagulation forming device is disclosed in Chinese Patent No. 201811628171.3, which is used to realize high-speed spinning of cellulose and reduce broken ends and uneven spinning during the spinning process. However, the diameter of the coagulation bath pan in the device is too large, which occupies a large area in the industrialization of high-speed continuous spinning of cellulose fibers, resulting in fewer spinning positions per unit space. In the process of simultaneous high-speed spinning of multiple spinning positions in industrialization, once the pressure of accelerated water fluctuates, it is easy to cause uneven and unstable stress of the yarn bundle and uneven fineness. Long-term use can cause partial hole blockage of the porous grid or unstable water supply, which can easily form vortexes in the high-speed mixing process, causing slight trembling of the yarn bundle and twisting of the yarn bundle together during water flow mixing, which affects the quality of fiber uniformity. The existence of the elbow of the water outlet pipe can cause friction of the cellulose yarn bundle on the inner cavity wall, which can aggravate the fibrillation phenomenon of the yarn bundle with fewer numbers and high linear speed, and can affect the quality of the fiber. In addition, no solution for stable spinning of multiple positions is provided.

[0005] Chinese Patent No. 202210092875.3 discloses a dry-jet wet spinning equipment, which can improve production capacity, but is only suitable for low-stretching-speed spinning processes with a small amount of yarn winding or unevenness during production, which does not affect the quality of short yarn after cutting.

[0006] Therefore, there is no effective solution for high-speed spinning of cellulose fibers in the prior art, how to arrange more spinning positions in a unit space and ensure uniform and stable preparation between each spinning position.

[0007] Therefore, the present application is proposed. SUMMARY

[0008] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a multi-position integrated coagulation and drawing device, which can arrange more spinning positions in a smaller space and ensure uniform and stable preparation process, thereby reducing equipment occupation and investment cost.

[0009] To solve the above technical problems, the basic idea of the technical solution of the present application is:

[0010] A multi-position integrated coagulation and drawing device, comprising:

[0011] a mounting rack plate;

[0012] a plurality of water jet stretching assemblies arranged on the mounting rack plate, having a mixing channel for the yarn bundle and coagulation bath liquid to pass through, and a high-pressure cavity communicating with the mixing channel;

[0013] The high-pressure water pipe assembly comprises a high-pressure water main pipe and a plurality of high-pressure water branch pipes in communication with the high-pressure water main pipe respectively, and each high-pressure water branch pipe is in one-to-one correspondence with the high-pressure cavity;

[0014] The low-pressure water distribution cavity is arranged on the upper side of the mounting rack plate and is an annular cavity surrounding the outer periphery of the mounting rack plate, and has a plurality of liquid surface supplement water inlets distributed at intervals along the direction of surrounding the mounting rack plate, and the inner peripheral side wall of the low-pressure water distribution cavity is a static pressure orifice plate with water outlet openings;

[0015] The low-pressure water pipe assembly comprises a low-pressure water main pipe and a plurality of low-pressure water branch pipes in communication with the low-pressure water main pipe respectively, and each low-pressure water branch pipe is in one-to-one correspondence with the liquid surface supplement water inlet on the low-pressure water distribution cavity.

[0016] In the above scheme, the plurality of high-pressure water branch pipes are in communication with the same high-pressure water main pipe, which can be directly communicated through a multi-way joint, or indirectly communicated by additionally arranging a pipe structure therebetween, but it is necessary to ensure that the distances passed by the high-pressure water from the inlet of the high-pressure water main pipe to the outlet of each high-pressure water branch pipe are consistent, and if there are elbow structures in the pipe, the number of the elbow structures passed is also consistent. In this way, it can be ensured that the high-pressure water supplied by the same high-pressure water main pipe has completely consistent pressure in each high-pressure cavity.

[0017] Similarly, the plurality of low-pressure water branch pipes are in communication with the same low-pressure water main pipe, which can be directly communicated through a multi-way joint, or indirectly communicated by additionally arranging a pipe structure therebetween, but it is necessary to ensure that the distances passed by the low-pressure water from the inlet of the low-pressure water main pipe to the outlet of each low-pressure water branch pipe are consistent, and if there are elbow structures in the pipe, the number of the elbow structures passed is also consistent. In this way, it can be ensured that the low-pressure water supplied by the same low-pressure water main pipe has completely consistent pressure in the low-pressure water distribution cavity through each liquid surface supplement water inlet, so as to form a stable flow in the low-pressure water distribution cavity, and then the water flow fills the spinning liquid surface cavity formed by the static pressure orifice plate and the mounting rack plate. Further, when the low-pressure water supplemented by each liquid surface supplement water inlet flows out above the mounting rack plate, the flow path length and the coverage area are basically consistent, so that a basically stable horizontal plane can be formed in the spinning liquid surface cavity, and the disturbance to the fiber bundle is reduced.

[0018] In the above scheme, the plurality of high-pressure water branch pipes are in communication with the same high-pressure water main pipe, which can be directly communicated through a multi-way joint, or indirectly communicated by additionally arranging a pipe structure therebetween, but it is necessary to ensure that the distances passed by the high-pressure water from the inlet of the high-pressure water main pipe to the outlet of each high-pressure water branch pipe are consistent, and if there are elbow structures in the pipe, the number of the elbow structures passed is also consistent. In this way, it can be ensured that the high-pressure water supplied by the same high-pressure water main pipe has completely consistent pressure in each high-pressure cavity.

[0019] In the present invention, high-pressure water and low-pressure water can each be supplied from a single water source. Combined with the structural design of the high-pressure water pipe assembly, low-pressure water pipe assembly, and low-pressure water distribution chamber, a substantially consistent water outlet velocity can be achieved at the mixing channel of each hydraulic jet stretching assembly, thereby achieving multi-position uniform drafting, consistent coagulation double diffusion process, and fiber formation. This ensures fiber uniformity and quality, reduces tow wear and fibrillation, and is particularly beneficial for the industrial production of high-speed continuous spinning of cellulose fibers. Furthermore, the use of a multi-position integrated structure can reduce the distance between spinning positions, reduce equipment footprint, and reduce factory investment.

[0020] In a further embodiment, the high-pressure water pipe assembly further comprises at least one high-pressure water tee joint; the high-pressure water tee joint has a water inlet and two water outlets, and the two water outlets are symmetrically arranged relative to the axis of the water inlet;

[0021] The high-pressure water main is connected to two high-pressure water manifolds simultaneously via a high-pressure water tee joint; or the high-pressure water pipe assembly includes a plurality of high-pressure water tees and at least two high-pressure water intermediate pipes, the high-pressure water main is connected to two high-pressure water intermediate pipes simultaneously via a high-pressure water tee joint, and each high-pressure water intermediate pipe is connected to the other two high-pressure water intermediate pipes or two high-pressure water manifolds simultaneously via a high-pressure water tee joint;

[0022] Preferably, the inner diameter d of the high-pressure water pipe is h,out The inner diameter d of the high-pressure water main h Satisfied: 0.707 n ×d h -1mm≤d h,out ≤0.707 n ×d h +1mm, where n is the number of high-pressure water tees between the high-pressure water main and the high-pressure water branch;

[0023] Alternatively, the inner diameter d of the high-pressure water intermediate pipe is h,mid The inner diameter d of the high-pressure water main h Satisfied: 0.707 m ×d h -1mm≤d h,mid ≤0.707 m ×d h +1mm, where m is the number of high-pressure water tee joints between the high-pressure water main pipe and the high-pressure water intermediate pipe.

[0024] In the above solution, the number of the hydraulic jet stretching components is an even number, more specifically, the number n=2 a, where a is a positive integer, i.e., a = 1, 2, 3, etc. In this way, the number of high-pressure water manifolds provided is the same as the number of hydraulic jet stretching assemblies. This allows the high-pressure water in the high-pressure water main to be evenly distributed to the high-pressure chambers of each hydraulic jet stretching assembly through a hydraulic pressure-equalizing distribution method of one-to-two, two-to-four, four-to-eight, etc., ensuring consistent pressure within the high-pressure chambers of each spinning station. Furthermore, consistent high-pressure jet velocity is achieved in each hydraulic jet stretching assembly, facilitating the application of consistent stretching force to the filaments formed at each spinning station.

[0025] Preferably, the high-pressure water main is provided with a first pressure sensor for obtaining the high-pressure water pressure. The high-pressure water pressure can be detected by the first pressure sensor, thereby facilitating adjustment of the high-pressure water pressure according to actual needs to change the water flow rate.

[0026] In a further embodiment, the low-pressure water pipe assembly further comprises a plurality of low-pressure water tee joints and a plurality of low-pressure water intermediate pipes;

[0027] The low-pressure water tee joint has a water inlet and two water outlets, and the two water outlets are symmetrically arranged relative to the axis of the water inlet;

[0028] The low-pressure water main pipe is connected to two low-pressure water intermediate pipes at the same time through a low-pressure water tee joint; each low-pressure water intermediate pipe is connected to the other two low-pressure water intermediate pipes at the same time through a low-pressure water tee joint, or is connected to two low-pressure water branch pipes at the same time;

[0029] Preferably, the inner diameter d of the low-pressure water pipe is l,out The inner diameter d of the low-pressure water main l Satisfied: 0.707 s ×d l -1mm≤d l,out ≤0.707 s ×d l +1mm, where s is the number of low-pressure water tees between the low-pressure water main and the low-pressure water branch;

[0030] Alternatively, the inner diameter d of the low-pressure water intermediate pipe is l,mid The inner diameter d of the low-pressure water main l Satisfied: 0.707 t ×d l -1mm≤d l,mid ≤0.707 t ×d l +1mm, where t is the number of low-pressure water tee joints between the low-pressure water main pipe and the low-pressure water intermediate pipe.

[0031] Further, the opening ratio η of the static pressure orifice plate is greater than or equal to 0.30, preferably greater than or equal to 0.52.

[0032] In the above scheme, similar to the distribution mode of high-pressure water, the low-pressure water is also distributed in a one-to-two, two-to-four, four-to-eight, and so on, distribution mode, so as to be evenly distributed into the low-pressure water distribution cavity. At the same time, with a reasonable opening ratio design of the static pressure orifice plate, the low-pressure water in the low-pressure water distribution cavity can flow through the static pressure orifice plate, and then evenly spread on the spinning solution surface cavity.

[0033] Further, a second pressure sensor for obtaining the pressure of the low-pressure water is arranged on the low-pressure water main pipe. The pressure of the low-pressure water can be detected by the second pressure sensor, so as to facilitate adjusting the pressure of the low-pressure water according to actual needs, and cooperating with the high-pressure water pressure to change the water flow speed.

[0034] Further, the water-jet stretching assembly comprises a stretching position panel arranged on the mounting rack plate, the mounting rack plate has a certain extension length in the horizontal direction, and a plurality of stretching position panels are uniformly distributed along the length direction of the mounting rack plate; the stretching position panel has a circular contour, and the center of the circular contour coincides with the central axis of the mounting rack plate.

[0035] The liquid surface supplement water inlet is arranged on the bottom wall of the low-pressure water distribution cavity, and the number of the liquid surface supplement water inlets is twice the number of the water-jet stretching assemblies; the liquid surface supplement water inlets are arranged on both sides of the length direction of the mounting rack plate in a spaced manner, and the center line of the two oppositely arranged liquid surface supplement water inlets passes through the center position of the stretching position panel between the two liquid surface supplement water inlets; the water area controlled by each liquid surface supplement water inlet on the upper side of the mounting rack plate is equal.

[0036] Preferably, the area surrounded by the downward projection line of the static pressure orifice plate constitutes the total water area on the upper side of the mounting rack plate, the total water area is divided by a plurality of division lines perpendicular to the length direction of the mounting rack plate, the division line passes through the midpoint of the center line of any two adjacent stretching position panels, and two end sub-areas at both ends and a plurality of intermediate sub-areas between the two end sub-areas can be obtained.

[0037] The static pressure orifice plate extends along an elliptical arc in the end region of the mounting rack plate to encircle the end of the mounting rack plate, so that the area of the end sub-area and the area of each intermediate sub-area are equal.

[0038] In the present application, low-pressure water is used as the water supply source for supplementing water into the spinning solution surface cavity, and the arrangement of the inlet position of the water supply source, i.e., the arrangement of the liquid surface water supplement inlet position, directly affects the stability of water supplement. The above scheme controls the water area controlled by each liquid surface water supplement inlet in the spinning solution surface cavity to be consistent by reasonable division, thereby controlling the liquid amount sucked by each hydraulic jet stretching assembly to be consistent with the water amount supplemented into the spinning solution surface cavity by the corresponding region of the low-pressure water distribution cavity, ensuring the formation of a stable low-pressure water laminar flow liquid surface in the spinning solution surface cavity, and reducing the disturbance to the nascent fiber tow.

[0039] Further, the present inventors have found through a large number of experiments that the arrangement of the static pressure orifice plate and the low-pressure water distribution cavity in the form of extending along an elliptical arc at the two end regions of the installation rack plate is optimal for ensuring the formation of a stable low-pressure water laminar flow liquid surface in the spinning solution surface cavity. If the two ends are arranged in the form of a square, even if the above area requirement is met, the low-pressure water in the spinning solution surface cavity may still flow upward. Since the spinning plate above the spinning solution surface cavity is used for spinning solution jetting and has a high temperature, the cold water may contact the high-temperature spinning plate and affect the upstream spinning equipment.

[0040] In the scheme of the present application, the low-pressure water pipe assembly uniformly distributes low-pressure water into the low-pressure water distribution cavity through a consistent water flow distribution mode, cooperates with a reasonable static pressure orifice plate opening rate design to make the low-pressure water laminar flow static pressure orifice plate, and then uniformly covers the spinning solution surface cavity. At the same time, the pipe diameter of the low-pressure water pipe assembly is designed to gradually decrease, and the water area corresponding to each liquid surface water supplement inlet is strictly calculated to ensure that the effective circumference of the liquid suction hole controlled by each liquid surface water supplement inlet is consistent, forming a stable low-pressure water laminar flow liquid surface and reducing the disturbance to the fiber tow.

[0041] In a further scheme, the hydraulic jet stretching assembly includes a stretching site panel arranged on the installation rack plate, an upper and lower through liquid suction hole is arranged at the center of the stretching site panel, and the liquid suction hole is in communication with the mixing channel; the lower side surface of the stretching site panel has a lower cone ring extending downward from the outer periphery of the liquid suction hole and gradually decreasing in outer diameter, the outer peripheral wall of the lower cone ring has a taper angle β, and the inner diameter of the lower end of the lower cone ring is d1.

[0042] The hydraulic jet stretching assembly further includes a mixing chamber vertically extending downward from the lower side of the stretching site panel, the high-pressure cavity is formed outside the mixing chamber, the mixing chamber is hollow inside to form the mixing channel, and the lower cone ring extends into the mixing channel from the upper end of the mixing chamber; the inner diameter of the mixing chamber gradually decreases within a certain height downward from the upper end of the mixing chamber to form a tapered inner wall surrounding the outer peripheral wall of the lower cone ring and arranged at a distance from the outer peripheral wall of the lower cone ring, and the tapered inner wall has a taper angle γ; the inner peripheral wall of the mixing chamber vertically extends downward from the lower end of the tapered inner wall and maintains an inner diameter of d2.

[0043] Wherein, β < γ, and d1≥d2.

[0044] Further, the liquid suction hole is a tapered hole with a taper angle α, and the hole diameter gradually decreases from top to bottom.

[0045] Wherein, 10° < α < 85°, and 3.5° < β < 52.5°.

[0046] Preferably, 32° < α < 55°, and 8.2° < β < 36.8°.

[0047] Further, the outer diameter of the mixing chamber gradually increases within a certain height from the upper end of the mixing chamber, forming an outer taper surface with a taper angle θ.

[0048] Wherein, 1.8° < γ < 67.2°, and 32° < θ < 86.3°.

[0049] Preferably, 7.6° < γ < 42.6°, and 45° < θ < 73.8°.

[0050] In the above scheme, the filament passes through the liquid suction hole into the mixing channel, and the high-pressure water entering the high-pressure chamber forms a high-pressure jet through the annular gap formed by the lower taper ring and the tapered inner wall at the upper end of the mixing chamber, thereby forming a hydraulic negative pressure at the lower end of the lower taper ring. The hydraulic negative pressure is transmitted to the liquid suction hole, which in turn can attract the low-pressure water on the stretching site panel to flow downward and mix with the high-pressure water. The filament is subjected to hydraulic stretching under the high-speed pulling of the mixed water, and at the same time, the spinning solution stream is subjected to coagulation and double-diffusion forming and water washing to form a cellulose fiber filament. By reasonably designing the sizes of the taper angles α, β, γ, and θ in the above structure, as well as the inner diameter d1 of the lower end of the lower taper ring and the inner diameter d2 of the mixing chamber, it can be ensured that the coagulation bath liquid composed of high and low pressure water maintains the same movement direction as the fiber filament, which can effectively ensure that the filament is fully coagulated, prevent single filament breakage, reduce lint and defects, and reduce cellulose filament fibrillation. In particular, the taper angle β < γ, and the width of the annular gap gradually decreases along the direction of the high-pressure jet, further ensuring the effect of stretching the filament by the hydraulic negative pressure formed thereby.

[0051] Further, the lower end of the mixing chamber is connected to a vertically extending diffusion pipe, and the inner diameter of the diffusion pipe gradually increases from the upper end to the lower end, forming a taper angle κ.

[0052] Wherein, 0° < κ < 45.6°, and preferably, 0° < κ < 17.3°.

[0053] Preferably, a guide ring is installed at the filament outlet of the diffusion pipe.

[0054] The material of the guide ring is a wear-resistant material, such as stainless steel, hastelloy, ceramic, or diamond, etc. Alternatively, the guide ring is made by a surface treatment process, and the surface treatment process includes chrome plating or nitriding, etc.

[0055] The surface roughness Ra of the guide wire ring is less than or equal to 0.8;

[0056] Preferably, the material of the guide wire ring is ceramic or diamond, and the surface roughness Ra of the guide wire ring is 0.1.

[0057] In the above scheme, the taper angle κ formed by the diffusion pipe is located at the outlet end of the mixing channel, so that the mixed water entraining the fiber bundle is released from the geomagnetic water flow rotation force of the annular gap at this position, and a high-speed horizontal current is formed at the fiber bundle outlet of the diffusion pipe and the hydraulic stretching of the cellulose fiber bundle is completed.

[0058] Further, the hydraulic jet stretching assembly further comprises a high-pressure jet cavity installed on the lower side of the mounting rack plate, and the mixing chamber penetrates through the bottom wall of the high-pressure jet cavity and extends into the high-pressure jet cavity; the high-pressure cavity is formed between the outer wall of the mixing chamber and the inner wall of the high-pressure jet cavity.

[0059] The bottom wall of the high-pressure jet cavity is provided with a mounting portion for mounting the mixing chamber, and the mounting portion is threadedly connected with the side wall of the mixing chamber.

[0060] In the above scheme, the high-pressure jet cavity and the mixing chamber are connected through threads, and the gap δ between the outer peripheral wall of the lower taper ring and the tapered inner wall at the upper end of the mixing chamber can be adjusted by rotating the mixing chamber, so that a set of devices can be flexibly adjusted according to different spinning requirements, and the adjustment operation is simple and easy to realize. In the present application, the range of the gap δ can be set as 0mm≤δ≤20mm, preferably 0mm<δ≤10mm.

[0061] It should be noted that the gap δ in the present application specifically refers to the interval distance between the outer peripheral position of the lower end surface of the lower taper ring in the vertical direction and the corresponding position of the tapered inner wall at the upper end of the mixing chamber.

[0062] Further, the upper side of the static pressure orifice plate is connected with a static pressure orifice plate flange, the static pressure orifice plate flange covers the top wall of the low-pressure water distribution cavity on the outside, and the static pressure orifice plate flange and the top wall of the low-pressure water distribution cavity clasp the overflow gasket therebetween.

[0063] Preferably, the overflow gasket is a soft gasket with a certain compression amount, and the material of the overflow gasket is selected from aluminum, rubber, asbestos rubber plate, PTFE or EPDM, etc.

[0064] Preferably, the material of the overflow gasket is selected from PTFE or EPDM.

[0065] Further, the multi-functional coagulation stretcher further comprises an overflow water tank arranged around the low-pressure water distribution cavity, and the upper side of the overflow water tank is open.

[0066] Compared with the prior art, the application has the following beneficial effects.

[0067] 1. The multi-station integrated coagulation and drawing device uses water as the motive force for fiber drawing, simultaneously serving as a cooling medium and a washing medium, thereby synchronously completing the orientation drawing and coagulation forming of high molecular chains, and also considering the washing function, so that the device has multiple functions, reduces the configuration of single-line devices, and reduces the investment and operation energy consumption of the device.

[0068] 2. The water jet stretching and coagulation forming replaces the existing mechanical winding and water bath coagulation system, greatly reduces the size of the device, can arrange more spinning positions in a small space, reduces the land occupation of industrialization, and in addition, the multi-station integrated structure can reduce the distance between spinning positions, reduce the land occupation of the device, and reduce the investment of the factory building.

[0069] 3. Through structural design, the stability and uniformity of water flow are realized, the uniform drawing, consistent coagulation and double diffusion processes and the formation of fibers are ensured, the uniformity and quality of the fibers are ensured, the abrasion and fibrillation of the fiber bundle are reduced, and the high-speed continuous industrial production of cellulose fibers is especially beneficial.

[0070] 4. In the water distribution, through the water pressure distribution mode of one into two, two into four, four into eight, etc., the path length of each high-pressure water passage is controlled, the high-pressure water balance in the main high-pressure water pipeline is distributed to the high-pressure jet cavities of multiple water jet drawing devices, the pressure consistency in each high-pressure jet cavity of the spinning position is ensured, the stable coagulation bath flow field lays a foundation for obtaining consistent high-pressure jet water speed, the low-pressure water is uniformly distributed to the low-pressure water distribution cavity through a similar mode, and the low-pressure water laminar static pressure orifice plate is uniformly spread on the spinning liquid surface cavity through reasonable static pressure orifice plate opening rate design, through the design of gradually reducing the pipe diameter and the strict calculation of the water area corresponding to each liquid surface water inlet, the effective circumference of the liquid absorption hole controlled by each liquid surface water inlet is consistent, and the stable low-pressure water laminar flow surface reduces the disturbance of the fiber bundle.

[0071] 5. By rationally designing multiple structural parameters in the hydraulic jet stretching assembly and coordinating with appropriate high-pressure water pressure, it can be ensured that high-pressure water can obtain high-speed high-pressure jet water after passing through the annular gap and form a hydraulic negative pressure in the suction hole of the stretching panel to attract the liquid surface balance water on the stretching panel to move downward. The tow is hydraulically stretched to form a cellulose fiber tow under the high-speed pulling of the mixed water, and at the same time, the spinning solution stream is coagulated and double-diffused and washed to form a cellulose fiber tow. The coagulation bath composed of high and low pressure water maintains the same movement direction as the fiber tow, which effectively ensures that the tow is fully coagulated, prevents single filament breakage, reduces hair and defects, and reduces the fibrillation of cellulose tow. At the same time, the structural design of the diffusion tube can release the rotational force of the geomagnetic water flow in the annular gap, eliminate the vortex in the mixing channel, form a high-speed flat flow at the outlet of the diffusion tube, and complete the hydraulic stretching of the cellulose fiber tow.

[0072] 6. The multi-in-one coagulation stretcher of the present invention can achieve the selection of different water speeds, drawing tensions, and spinning speeds by adjusting the matching values ​​of high-pressure water and low-pressure water, so that it is suitable for different preparation conditions and can spin fibers of different specifications; it can be used for tow drawing in high-speed spinning processes, and can also be used in the drawing process of ordinary short fiber spinning.

[0073] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an undue limitation of the present invention. Obviously, the drawings described below are only some embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive effort. In the accompanying drawings:

[0075] Figure 1 This is a schematic structural diagram of a multi-in-one coagulation stretcher according to a specific embodiment of the present invention;

[0076] Figure 2 This is a schematic structural diagram of a multi-in-one coagulation stretcher in a specific embodiment of the present invention, cut along a direction perpendicular to the central axis;

[0077] Figure 3 It is a schematic structural diagram of a multi-in-one coagulation stretcher cut along the central axis in a specific embodiment of the present invention;

[0078] Figure 4 is a bottom view of the stretched panel in a specific embodiment of the present invention;

[0079] Figure 5 This is a schematic diagram of the cross-section structure of the stretched panel in a specific embodiment of the present invention;

[0080] Figure 6 is the structure diagram of the mixing chamber in the embodiment of the present application;

[0081] Figure 7 is the sectional structure diagram of the mixing chamber in the embodiment of the present application;

[0082] Figure 8 is the assembly diagram of the lower cone ring and the mixing chamber in the embodiment of the present application;

[0083] Figure 9 is the sectional structure diagram of the diffusion pipe in the embodiment of the present application;

[0084] Figure 10 is the structure diagram of the liquid surface static pressure orifice plate assembly in the embodiment of the present application;

[0085] Figure 11 is the structure diagram of the high-pressure water pipe assembly in the embodiment of the present application;

[0086] Figure 12 is the structure diagram of the low-pressure water pipe assembly in the embodiment of the present application;

[0087] Figure 13 is the diagram of the water area controlled by each liquid surface water supplement inlet in the embodiment of the present application;

[0088] Figure 14 is the structure diagram of the high-pressure water pipe assembly suitable for the eight-in-one coagulation and drawing device in the embodiment of the present application;

[0089] Figure 15 is the structure diagram of the low-pressure water pipe assembly suitable for the eight-in-one coagulation and drawing device in the embodiment of the present application.

[0090] In the figure: L, the division line; A1, the end sub-area; A2, the middle sub-area;

[0091] 110, the mounting rack plate; 120, the hydraulic jet drawing assembly; 121, the drawing position plate; 1211, the liquid suction hole; 1212, the lower cone ring; 122, the connecting plate; 123, the high-pressure jet flow cavity; 1230, the high-pressure cavity; 1231, the pressure equalizing orifice plate; 124, the mixing chamber; 1241, the mixing channel; 1242, the sealing fitting part; 1243, the groove; 125, the diffusion pipe; 1251, the diffusion pipe body; 1252, the guide wire ring;

[0092] 200, the liquid surface static pressure orifice plate assembly; 210, the static pressure orifice plate; 220, the static pressure orifice plate flange; 230, the low-pressure water distribution cavity; 231, the liquid surface water supplement inlet; 240, the spinning liquid surface cavity; 300, the overflow water tank; 600, the overflow gasket;

[0093] 400, high-pressure water pipe assembly; 410, high-pressure water main pipe; 410-1, first pressure sensor; 420, high-pressure water intermediate pipe; 430, high-pressure water branch pipe; 440, high-pressure water tee joint; 451, high-pressure water two-way branch pipe; 452, high-pressure water four-way branch pipe; 453, high-pressure water eight-way branch pipe; 461, high-pressure water one-to-two joint; 462, high-pressure water two-to-four joint; 463, high-pressure water four-to-eight joint;

[0094] 500, low-pressure water pipe assembly; 510, low-pressure water main pipe; 510-1, second pressure sensor; 520, low-pressure water intermediate pipe; 530, low-pressure water branch pipe; 540, low-pressure water tee joint; 551, low-pressure water two-way branch pipe; 552, low-pressure water four-way branch pipe; 553, low-pressure water eight-way branch pipe; 554, low-pressure water sixteen-way branch pipe; 561, low-pressure water one-to-two joint; 562, low-pressure water two-to-four joint; 563, low-pressure water four-to-eight joint; 564, low-pressure water eight-to-sixteen joint.

[0095] It should be noted that the drawings and the written description are not intended to limit the scope of the present application in any way, but are merely to illustrate the concept of the present application to those skilled in the art. DETAILED DESCRIPTION

[0096] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments will be described clearly and completely below with reference to the drawings of the embodiments of the present application. The following embodiments are used to illustrate the present application, but are not used to limit the scope of the present application.

[0097] In the description of the present application, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are merely for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0098] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0099] As Figures 1 to 13As shown, the embodiment of the present application provides a multi-station integrated coagulation and drawing device for realizing the coagulation and drawing process in the cellulose fiber spinning process. Specifically, the spinning solution is jetted by the jetting assembly to form a dope stream, which can be contacted with the coagulation bath to realize double diffusion and coagulation forming and exert a certain drawing force on the fiber bundle through the multi-station integrated coagulation and drawing device of the embodiment of the present application.

[0100] The multi-station integrated coagulation and drawing device provided by the embodiment of the present application specifically comprises a hydraulic jet drawing unit, a liquid surface static pressure orifice plate assembly 200, a high-pressure water pipe assembly 400 and a low-pressure water pipe assembly 500.

[0101] Specifically, the hydraulic jet drawing unit comprises a mounting rack plate 110 and a plurality of hydraulic jet drawing assemblies 120 mounted on the mounting rack plate 110. The multi-station integrated coagulation and drawing device is applied to a spinning device, and each hydraulic jet drawing assembly 120 corresponds to a spinning station, that is, the jetting plate of the jetting assembly is arranged directly above the hydraulic jet drawing assembly 120, and the dope stream can be introduced into the hydraulic jet drawing assembly 120 to realize coagulation and drawing and form the nascent fiber.

[0102] More specifically, in the embodiment of the present application, the liquid surface static pressure orifice plate assembly 200 is arranged on the upper side of the mounting rack plate 110 to form a low-pressure water distribution cavity 230 around the outer periphery of the mounting rack plate 110. The low-pressure water distribution cavity 230 is an annular chamber around the outer periphery of the mounting rack plate 110, which has a plurality of liquid surface water supplement inlets 231 on the upper side for supplementing water into the cavity, and the inner peripheral side wall of the low-pressure water distribution cavity 230 is a static pressure orifice plate 210 with water outlet openings.

[0103] The static pressure orifice plate 210 and the mounting rack plate 110 jointly form a spinning liquid surface cavity 240 on the upper side of the hydraulic jet drawing assembly 120. The hydraulic jet drawing assembly 120 has a mixing channel 1241 through which the fiber bundle and the coagulation bath pass, and a high-pressure cavity 1230 in communication with the mixing channel 1241. The mixing channel 1241 extends vertically downward on the lower side of the mounting rack plate 110 and is in communication with the spinning liquid surface cavity 240 through the liquid suction hole 1211 arranged on the hydraulic jet drawing assembly 120, and has a slit structure for communicating with the high-pressure cavity 1230 at a position close to the upper end of the mixing channel 1241.

[0104] In the spinning process, the dope stream or the stage primary fiber bundle passes through the mixing channel 1241 from top to bottom. The low pressure water is supplied into the low pressure water distribution cavity 230 through the low pressure water pipe assembly 500, and the low pressure water fills the spinning liquid surface cavity 240 through the static pressure orifice plate 210. The high pressure water is supplied into the high pressure cavity 1230 through the high pressure water pipe assembly 400, and the high pressure water enters the mixing channel 1241 through the slit structure described above, and forms a high speed jet at the slit structure, and further forms a vacuum below the suction hole 1211, so as to suck the low pressure water in the spinning liquid surface cavity 240 into the mixing channel 1241 to mix with the high pressure water, and at the same time, the high speed downward of the wrapped fiber bundle realizes the stretching of the fiber bundle.

[0105] As a specific embodiment, the water jet stretching assembly 120 includes a stretching position panel 121, a high pressure jet cavity 123 and a mixing chamber 124. The stretching position panel 121 is arranged on the installation rack plate 110, and the high pressure jet cavity 123 and the mixing chamber 124 are arranged on the lower side of the installation rack plate 110.

[0106] In a specific structure, the installation rack plate 110 is provided with an installation opening penetrating through the upper and lower sides, the stretching position panel 121 is installed in the installation opening, and the suction hole 1211 is arranged at the center of the stretching position panel 121. The high pressure jet cavity 123 is installed below the stretching position panel 121 and is hollow inside. The bottom wall of the high pressure jet cavity 123 is provided with a mounting part, and the mixing chamber 124 is vertically arranged and extends through the mounting part into the inside of the high pressure jet cavity 123. The side wall of the mixing chamber 124 is connected with the mounting part to fix the mixing chamber 124.

[0107] It can be understood that in another specific structure, the stretching position panel can also be integrally formed with the installation rack plate, and at this time, the suction hole penetrates through the stretching position panel from top to bottom, which is equivalent to penetrating through the installation rack plate from top to bottom.

[0108] In a further structure, the high pressure cavity 1230 is formed between the outer wall of the mixing chamber 124 and the inner wall of the high pressure jet cavity 123, and the mixing channel 1241 is formed in the hollow inside of the mixing chamber 124. The lower side surface of the stretching position panel 121 has a lower cone ring 1212 formed by extending downward from the outer periphery of the suction hole 1211, and the outer diameter of the lower cone ring 1212 gradually decreases. The lower cone ring 1212 extends into the mixing channel 1241 through the mixing chamber 124. The inner diameter of the mixing chamber 124 gradually decreases from the upper end line, and a tapered inner wall with a certain height is formed. The tapered inner wall surrounds the outer peripheral wall of the lower cone ring 1212 and is arranged in a spaced manner with the outer peripheral wall of the lower cone ring 1212. From the lower end of the tapered inner wall, the inner peripheral wall of the mixing chamber 124 extends vertically downward, so that the diameter of the mixing channel 1241 remains constant in height.

[0109] In the above structure, the outer peripheral wall of the lower conical ring 1212 and the conical inner wall of the mixing chamber 124 have an annular gap therebetween, which serves as a slit structure for connecting the high-pressure cavity 1230 and the mixing passage 1241, and high-pressure water forms a high-speed jet stream at this location to generate a hydraulic negative pressure at the lower end of the lower conical ring 1212, which is transmitted to the liquid suction hole 1211 to draw the low-pressure water on the stretch position panel 121 downward.

[0110] In a detailed structure, the upper end of the high-pressure jet stream cavity 123 is open and fixedly connected to a connecting plate 122. The connecting plate 122 is fixed to the upper end surface of the high-pressure jet stream cavity 123 and extends outward from the opening of the upper end of the high-pressure jet stream cavity 123 to form an annular structure. The connecting plate 122 is fixedly connected to the lower side surface of the stretch position panel 121, for example, by screws, to fix the high-pressure jet stream cavity 123 below the stretch position panel 121. A sealing member is arranged between the connecting plate 122 and the stretch position panel 121 to ensure the sealing performance of the high-pressure cavity 1230.

[0111] In a further scheme, the lower side surface of the stretch position panel 121 extends downward and outward from the outer periphery of the lower conical ring 1212 by a certain distance. The outer diameter of the mixing chamber 124 gradually increases from its upper end downward to form an outer conical surface with a certain height. The high-pressure cavity 1230 is further provided with an equalizing hole plate 1231, which is an annular plate sleeved on the mixing chamber 124 and has a plurality of equalizing holes formed therein. The equalizing hole plate 1231 is specifically installed at a position close to the upper end of the mixing chamber 124 and below the lowermost end of the outer conical surface.

[0112] In the spinning process, high-pressure water enters the high-pressure cavity 1230 through the opening structure on the side wall of the high-pressure jet stream cavity 123, passes through the equalizing holes of the equalizing hole plate 1231, and then enters the mixing passage 1241 through the slit structure between the outer peripheral wall of the lower conical ring 1212 and the conical inner wall at the upper end of the mixing chamber 124, and forms a high-speed jet stream to generate a vacuum at the liquid suction hole 1211 to draw the low-pressure water above into the mixing passage 1241 to mix with the high-pressure water, while the fiber bundle is entrained through the mixing passage 1241.

[0113] In a specific embodiment, the high-pressure jet stream cavity 123 is provided with a plurality of openings on the side wall thereof, and the high-pressure cavity 1230 is provided with a plurality of equalizing holes in the equalizing hole plate 1231. Figures 4 to 8 As shown, the outer peripheral wall of the lower conical ring 1212 has a conical angle β, and the conical inner wall of the upper end of the mixing chamber 124 has a conical angle γ, and β < γ. In this way, the width of the annular gap between the two gradually narrows along the flow direction of the high-pressure water, and the effect of the high-pressure jet stream is better.

[0114] The lower end of the lower conical ring 1212 has an inner diameter of d1, and the mixing chamber 124 has a constant inner diameter d2 in the area below the conical inner wall (i.e., the diameter of the mixing channel 1241 is d2), and d1≥d2. In a preferred structure, the lower end of the lower conical ring 1212 has an inner diameter d1 slightly larger than the diameter d2 of the mixing channel 1241, to ensure the hydraulic stretching effect on the filament bundle.

[0115] In a more specific structure, after the mixing chamber 124 is assembled with the high-pressure jet cavity 123, the lower end of the lower conical ring 1212 is higher than the lower end of the conical inner wall, i.e., the vertical downward projection of the outer periphery of the lower end face of the lower conical ring 1212 falls on the conical inner wall. In combination with the above-mentioned structure, the lower end of the lower conical ring 1212 is higher than the lower end of the conical inner wall, and the outer periphery of the lower end face of the lower conical ring 1212 is higher than the outer periphery of the lower end of the conical inner wall. Figure 8 The gap δ between the vertical direction of the outer periphery of the lower end face of the lower conical ring 1212 and the corresponding position of the conical inner wall can be set to 0mm≤δ≤20mm, and preferably 0mm<δ≤10mm.

[0116] As a specific embodiment, the assembly part on the bottom wall of the high-pressure jet cavity 123 is a threaded hole, and the outer thread is provided on the sidewall of the mixing chamber 124 within a certain height range and matches the threaded hole. The high-pressure jet cavity 123 and the mixing chamber 124 are connected by threads, and the assembly height of the mixing chamber 124 on the high-pressure jet cavity 123 can be adjusted by rotating the mixing chamber 124, thereby adjusting the size of the gap δ. In this way, the gap δ can be flexibly adjusted according to different spinning needs, and the adjustment operation is simple and easy to implement, so that a set of device can be applied to different spinning needs.

[0117] Further, the outer thread is provided in the middle region of the mixing chamber 124, and below the outer thread, the mixing chamber 124 has a sealing fitting part 1242 with an outer diameter larger than the upper region. The sealing fitting part 1242 is provided with a groove 1243 for sleeving a sealing ring. The bottom wall of the high-pressure jet cavity 123 has a through hole, the upper region of the through hole is a threaded hole, and the inner diameter of the lower region is larger than that of the threaded hole. After the mixing chamber 124 is assembled with the high-pressure jet cavity 123, the sealing fitting part 1242 is inserted into the lower region of the through hole, and the sealing of the through hole is realized by the sealing ring sleeved in the groove 1243, preventing the high-pressure cavity 1230 from leaking water.

[0118] As a specific scheme, the liquid suction hole 1211 on the stretching site panel 121 is a conical hole with a taper angle α, and the hole diameter gradually decreases from top to bottom. The inner diameter of the lower conical ring 1212 remains constant along the height direction, and the lower end inner diameter of the conical hole is the same as that of the lower conical ring 1212, both being d1.

[0119] The cone angle a and the cone angle b are in the range of 10° < a < 85° and 3.5° < b < 52.5°, preferably 32° < a < 55° and 8.2° < b < 36.8°.

[0120] As a specific solution, the outer conical surface of the upper end of the mixing chamber 124 has a cone angle θ. The cone angle γ and the cone angle θ are in the range of 1.8° < γ < 67.2° and 32° < θ < 86.3°, preferably 7.6° < γ < 42.6° and 45° < θ < 73.8°.

[0121] In a specific embodiment of the present application, the stretching position plate 121 has a circular outer contour, and the outer peripheral region of the upper side surface is flush with the upper surface of the mounting rack plate 110. At a certain interval from the outer periphery, the upper surface of the stretching position plate 121 has a circumferentially extending annular protruding structure.

[0122] Further, the lower side surface of the stretching position plate 121 has a stepped surface gradually decreasing from the outer periphery to the center, which is specifically a three-level stepped surface, and the inner periphery of the three-level stepped surface extends upwardly to the upper end of the lower conical ring 1212. The mounting through hole on the mounting rack plate 110 has a stepped structure matching the lower side surface of the stretching position plate 121, so as to abut against the outermost circle of the three-level stepped surface. The upper side surface of the connecting plate 122 is also provided with a stepped structure, which abuts against the middle circle and the innermost circle of the three-level stepped surface, respectively. The sealing element provided between the stretching position plate 121 and the connecting plate 122 is specifically located between the innermost circle of the three-level stepped surface and the connecting plate 122.

[0123] In a further solution of the present application, a vertically extending diffusion pipe 125 is connected to the lower end of the mixing chamber 124. The inner diameter of the diffusion pipe 125 gradually increases from the upper end to the lower end, so that the inner wall has a certain cone angle. The fiber bundle in the mixing channel 1241 is finally discharged through the fiber bundle outlet at the lower end of the diffusion pipe 125.

[0124] In the embodiment of the present application, the high-pressure jet formed by the high-pressure water and the low-pressure water sucked through the suction hole 1211 form a rotational flow in the mixing channel 1241. By providing the diffusion pipe 125, the above-mentioned rotational flow can be eliminated, so that the mixed water entraining the fiber bundle is released from the rotational force of the annular gap magnetic water flow at this position, thereby forming a high-speed horizontal flow at the fiber bundle outlet at the lower end of the diffusion pipe 125, and completing the hydraulic stretching of the cellulose fiber bundle.

[0125] As a specific embodiment, the diffusion tube 125 comprises a diffusion tube body 1251 and a guide wire ring 1252 arranged at the lower end of the diffusion tube body 1251. In a specific structure, the inner circumferential wall of the diffusion tube body 1251 extends downwardly from the upper end to the direction close to the outer circumference, extends horizontally to the outer circumference for a distance and then extends vertically downwardly close to the lower end, thereby forming a mounting groove for accommodating the guide wire ring 1252.

[0126] In a specific scheme of the embodiment, the guide wire ring 1252 can be made of stainless steel, Hastelloy, ceramic or diamond, or the guide wire ring 1252 is made through surface treatment processes such as chrome plating or carburizing, thereby improving the surface hardness and wear resistance. The surface roughness Ra of the guide wire ring 1252 is controlled in the range of Ra≤0.8, thereby minimizing the wear between the filaments and the guide wire ring 1252.

[0127] In a preferred scheme, the guide wire ring 1252 is made of ceramic or diamond, and the surface roughness Ra of the guide wire ring 1252 is 0.1.

[0128] In a more specific structure, the lower end of the mixing chamber 124 is provided with a stepped hole for assembling the diffusion tube 125, the small-diameter section of the stepped hole is connected with the lower end of the mixing passage 1241 and is provided with an internal thread, and the large-diameter section below the small-diameter section is not provided with a threaded structure. Correspondingly, the diffusion tube body 1251 has a threaded section and a sealing section connected with the lower end of the threaded section, the outer diameter of the sealing section is larger than that of the threaded section, and an annular groove for mounting a sealing ring is arranged on the side wall of the sealing section.

[0129] The diffusion tube body 1251 is threadedly connected with the mixing chamber 124, the sealing section is inserted into the large-diameter section of the stepped hole, and the sealing is realized by the sealing ring sleeved on the sealing section.

[0130] In the embodiment, the multi-station integrated coagulation and drawing device has a plurality of water jet drawing assemblies 120, and the plurality of water jet drawing assemblies 120 are supplied with high-pressure water into the respective high-pressure cavities 1230 through the same set of high-pressure water pipe assemblies 400. In order to facilitate control, the high-pressure water pipe assemblies 400 comprise a high-pressure water main pipe 410 and a plurality of high-pressure water branch pipes 430, each of which is in communication with the high-pressure water main pipe 410 and is connected to each of the high-pressure cavities 1230 in one-to-one correspondence. In this way, only one high-pressure water supply source is needed.

[0131] In order to ensure the uniformity of the fiber filaments prepared at each spinning station, the water flow velocity in each mixing passage 1241 needs to be substantially consistent. Since the structures of the plurality of water jet drawing assemblies 120 can be designed to be completely consistent, the pressure of the high-pressure water supplied into each of the high-pressure cavities 1230 needs to be substantially consistent.

[0132] In one specific embodiment of the present application, the number of water jet stretching assemblies 120 is n = 2 a wherein a is a positive integer, i.e. a = 1 or 2 or 3 …, the high-pressure water branch pipe 430 is connected to the high-pressure cavity 1230 of each water jet stretching assembly 120 one by one, and the number of high-pressure water branch pipes 430 is the same as the number of water jet stretching assemblies 120, for example, two, four, eight or sixteen, etc.

[0133] The high-pressure water branch pipe 430 has the above-mentioned number, and the high-pressure water main pipe 410 can use a water pressure equalizing distribution mode of one into two, two into four, four into eight, etc. to evenly distribute the high-pressure water flow to each high-pressure water branch pipe 430 and ensure that the water outlet pressure of each high-pressure water branch pipe 430 is basically the same.

[0134] As one specific embodiment, the high-pressure water pipe assembly 400 further comprises a high-pressure water tee joint 440 having one water inlet and two water outlets, and the two water outlets are symmetrically arranged with respect to the axis of the water inlet. In one specific structure, the water outlet directions of the two water outlets are opposite and perpendicular to the water inlet direction of the water inlet.

[0135] When the high-pressure water branch pipe 430 is provided with two, the high-pressure water main pipe 410 is connected to the water inlet of the high-pressure water tee joint 440, and the two high-pressure water branch pipes 430 are respectively connected to the water outlets of the high-pressure water tee joint 440.

[0136] When the high-pressure water branch pipe 430 is provided with four, eight or more, the high-pressure water pipe assembly 400 further comprises a plurality of high-pressure water intermediate pipes 420.

[0137] When there are four high-pressure water branch pipes 430, the high-pressure water main pipe 410 is connected to two high-pressure water intermediate pipes 420 through one high-pressure water tee joint 440, and each high-pressure water intermediate pipe 420 is connected to two high-pressure water branch pipes 430 through one high-pressure water tee joint 440.

[0138] When there are eight or more high-pressure water branch pipes 430, the high-pressure water main pipe 410 is connected to two high-pressure water intermediate pipes 420 through one high-pressure water tee joint 440, and each high-pressure water intermediate pipe 420 is connected to another two high-pressure water intermediate pipes 420 through one high-pressure water tee joint 440, and so on, and the last high-pressure water intermediate pipe 420 in the high-pressure water flow direction is connected to two high-pressure water branch pipes 430 through one high-pressure water tee joint 440.

[0139] In the above scheme, each high-pressure water branch pipe 430 has the same structure, i.e., the same inner diameter and length, and if it has elbows, each has the same number of elbows. The high-pressure water intermediate pipes 420 belonging to the same level also have the same structure, where the same level refers to, for example, two high-pressure water intermediate pipes 420 split from the high-pressure water main pipe 410, or four high-pressure water intermediate pipes 420 split from the high-pressure water main pipe 410, and so on.

[0140] As a specific scheme, the high-pressure water pipe assembly 400 is arranged below the mounting rack plate 110, and the high-pressure water main pipe 410, the high-pressure water intermediate pipes 420, and the high-pressure water branch pipes 430 all extend in the same horizontal plane.

[0141] In a further scheme, the inner diameters of the pipes in the high-pressure water pipe assembly 400 are designed according to the pipe diameter calculation method for low-viscosity fluids, so that the water pressure in the high-pressure water main pipe 410 is consistent with the water pressure in the high-pressure water branch pipes 430. In this way, by controlling the water pressure of the high-pressure water entering the high-pressure water main pipe 410, the water pressure entering the high-pressure chamber 1230 is controlled, and the control is easier.

[0142] Specifically, the inner diameter of each high-pressure water branch pipe 430 is d h,out , which is consistent with the inner diameter d h of the high-pressure water main pipe 410, and satisfies: 0.707 n ×d h ≈d h,out , where n is the number of high-pressure water tee joints 440 between the high-pressure water main pipe 410 and the high-pressure water branch pipes 430.

[0143] In this way, the cross-sectional area of the high-pressure water main pipe 410 is basically consistent with the total cross-sectional area of the high-pressure water branch pipes 430, and the water pressure of the high-pressure water flowing out of the high-pressure water branch pipes 430 is basically consistent with the water pressure in the high-pressure water main pipe 410.

[0144] Further, the inner diameters of the high-pressure water intermediate pipes 420 belonging to the same level are the same, denoted as d h,mid , which is consistent with the inner diameter d h of the high-pressure water main pipe 410, and satisfies: 0.707 m ×d h -1mm≈d h,mid , where m is the number of high-pressure water tee joints 440 between the high-pressure water main pipe 410 and the high-pressure water intermediate pipes 420.

[0145] In this way, the total cross-sectional area of the high-pressure water intermediate pipes 420 belonging to the same level is consistent with the cross-sectional area of the high-pressure water main pipe 410, and the water pressure in the high-pressure water conveying structure is stable.

[0146] In practical applications, the above-mentioned approximate equal relationship can be set as: 0.707 n ×d h -1mm≤d h,out ≤0.707 n ×d h +1mm, and 0.707 m ×d h -1mm≤d h,mid ≤0.707 m ×d h +1mm.

[0147] In the preferred scheme of the embodiment, a first pressure sensor 410-1 is installed on the high-pressure water main pipe 410. The first pressure sensor 410-1 can be used to detect the pressure of the high-pressure water in the high-pressure water main pipe 410, which is the pressure of the water supplied to the high-pressure cavity 1230. In this way, the pressure of the high-pressure water can be adjusted according to actual needs to change the water flow rate.

[0148] In the embodiment, the low-pressure water surface in the spinning solution surface cavity 240 needs to be kept as stable as possible to reduce disturbance to the fiber bundle, which requires the low-pressure water in the low-pressure water distribution cavity 230 to pass through the static pressure orifice plate 210 into the spinning solution surface cavity 240 as evenly as possible.

[0149] In a further scheme, a plurality of liquid surface supplement water inlets 231 are distributed along the direction around the mounting machine frame plate 110, and the low-pressure water pipe assembly 500 includes a low-pressure water main pipe 510 and a plurality of low-pressure water branch pipes 530, which are connected to the liquid surface supplement water inlets 231 one by one. In this way, similar to the supply of high-pressure water, only a low-pressure water supply source needs to be set to supplement the low-pressure water through the plurality of liquid surface supplement water inlets 231 at the same time.

[0150] The number of liquid surface supplement water inlets 231, which is also the number of low-pressure water branch pipes 530, is an even number, preferably twice the number of hydraulic jet stretching assemblies 120. The low-pressure water pipe assembly 500 can also use a hydraulic pressure equalization distribution method of dividing by two, four, eight, and so on from the low-pressure water main pipe 510 to evenly distribute the low-pressure water flow to each low-pressure water branch pipe 530, ensuring that the water outlet pressures of each low-pressure water branch pipe 530 are substantially consistent, thereby uniformly supplementing water to the low-pressure water distribution cavity 230.

[0151] As a specific implementation, the low-pressure water pipe assembly 500 further includes a low-pressure water tee joint 540 and a low-pressure water intermediate pipe 520. The low-pressure water tee joint 540 has one water inlet and two water outlets, and the two water outlets are symmetrically arranged relative to the axis of the water inlet. In a specific structure, the water outlet directions of the two water outlets are opposite and perpendicular to the water inlet direction of the water inlet.

[0152] When two hydraulic jet stretching assemblies 120 are arranged, and four low-pressure water branch pipes 530 are arranged, the low-pressure water main pipe 510 is connected to two low-pressure water intermediate pipes 520 through a low-pressure water tee joint 540, and each low-pressure water intermediate pipe 520 is connected to two low-pressure water branch pipes 530 through a low-pressure water tee joint 540.

[0153] When four or more hydraulic jet stretching assemblies 120 are arranged, and eight or more low-pressure water branch pipes 530 are arranged, the low-pressure water main pipe 510 is connected to two low-pressure water intermediate pipes 520 through a low-pressure water tee joint 540, each low-pressure water intermediate pipe 520 is connected to another two low-pressure water intermediate pipes 520 through a low-pressure water tee joint 540, and so on, and the last low-pressure water intermediate pipe 520 in the low-pressure water flow direction is connected to two low-pressure water branch pipes 530 through a low-pressure water tee joint 540.

[0154] In the above scheme, each low-pressure water branch pipe 530 has the same structure, i.e., the same inner diameter and length, and if it has a bend, each has the same number of bends. The low-pressure water intermediate pipes 520 belonging to the same level also have the same structure.

[0155] As a specific scheme, the low-pressure water pipe assembly 500 is arranged below the mounting rack plate 110, and the liquid surface supplement water inlet 231 is arranged on the bottom wall of the low-pressure water distribution cavity 230. The low-pressure water main pipe 510 and the low-pressure water intermediate pipe 520 extend in the same horizontal plane, the low-pressure water branch pipe 530 extends a certain length in the horizontal direction from the water outlet of the low-pressure water tee joint 540, is bent once in the same horizontal plane, and is then bent upward, and finally extends upward to be connected to the liquid surface supplement water inlet 231.

[0156] In a further scheme, the inner diameters of the pipes in the low-pressure water pipe assembly 500 can be designed in the same way as the high-pressure water pipe assembly 400.

[0157] Specifically, the inner diameter d l,out of the low-pressure water branch pipe 530 satisfies: l 0.707 s ×d l ≈d l,out where s is the number of low-pressure water tee joints 540 between the low-pressure water main pipe 510 and the low-pressure water branch pipe 530.

[0158] The inner diameter d l,mid of the low-pressure water intermediate pipe 520 satisfies: l 0.707 t ×d l ≈d l,midWherein, t is the number of low-pressure water tee joints 540 between the low-pressure water main pipe 510 and the low-pressure water intermediate pipe 520.

[0159] Similarly to the high-pressure water pipe assembly 400, in actual applications, the above-mentioned approximate equality relationship can be set as: 0.707 s × d l -1mm≤d l,out ≤0.707 s × d l +1mm, and 0.707 t × d l -1mm≤d l,mid ≤0.707 t × d l +1mm.

[0160] In the preferred scheme of the embodiment of the present application, a second pressure sensor 510-1 is installed on the low-pressure water main pipe 510. The water pressure in the low-pressure water main pipe 510, i.e. the water pressure of the water supplementing the low-pressure water distribution cavity 230, can be detected by using the second pressure sensor 510-1. In this way, the water supply pressure of the low-pressure water can be adjusted according to actual requirements.

[0161] In the further scheme of the embodiment of the present application, the opening rate η of the static pressure orifice plate 210 is ≥0.30, and preferably, the opening rate η is ≥0.52. The above-mentioned low-pressure water distribution mode, in combination with the reasonable opening rate design of the static pressure orifice plate 210, can make the low-pressure water in the low-pressure water distribution cavity 230 flow in a laminar flow manner through the static pressure orifice plate 210, and then uniformly spread over the spinning solution surface cavity 240.

[0162] As a further scheme, the installation rack plate 110 has a certain extension length in the horizontal direction, and the plurality of hydraulic jet stretching assemblies 120 are arranged at intervals along the length direction of the installation rack plate 110, so that the plurality of stretching site plates 121 are uniformly distributed at intervals in the length direction of the installation rack plate. The circle of the circular outer contour of the stretching site plate 121 coincides with the central axis of the installation rack plate 110.

[0163] As the water supply source for supplementing water into the spinning solution surface cavity 240, the position arrangement of the liquid surface supplement water inlets 231 directly affects the stability of the water supplement. Specifically, in the embodiment of the present application, the water supplement amount and the water supplement pressure of each liquid surface supplement water inlet 231 are kept consistent by the structural design of the low-pressure water pipe assembly 500, and then the position of each liquid surface supplement water inlet 231 is reasonably arranged so that the water area controlled by each liquid surface supplement water inlet 231 in the spinning solution surface cavity 240 on the upper side of the installation rack plate 110 is equal, which can ensure the stability of the liquid surface in the spinning solution surface cavity 240.

[0164] As a specific embodiment, refer to Figure 13, the long bar-shaped outer contour in the figure corresponds to the downward projection line of the static pressure orifice plate 210, and the area surrounded by the projection line constitutes the total water area of the spinning solution surface cavity 240. The circular N1, N2, N3, …, Nn in the figure respectively correspond to the coverage area of each stretching position plate 121 on the mounting rack plate 110, and the shaded area in the figure is the water area controlled by each liquid surface replenishment water inlet 231.

[0165] Specifically, the liquid surface replenishment water inlets 231 are divided into two groups and are arranged on both sides of the length direction of the mounting rack plate 110, that is, on the outer periphery of the above-mentioned projection line. The line connecting the centers of the two liquid surface replenishment water inlets 231 arranged opposite to each other along the width direction of the mounting rack plate 110 passes through the center position of the stretching position plate 121 between them.

[0166] In Figure 13 , the water area controlled by each liquid surface replenishment water inlet 231 is specifically:

[0167] The liquid surface replenishment water inlet 231 at the leftmost rear side controls a water area of S1.1, and the liquid surface replenishment water inlet 231 at the leftmost front side controls a water area of S1.2.

[0168] The second liquid surface replenishment water inlet 231 from the left at the rear side controls a water area of S2.1, and the second liquid surface replenishment water inlet 231 from the left at the front side controls a water area of S2.2.

[0169] The third liquid surface replenishment water inlet 231 from the left at the rear side controls a water area of S3.1, and the third liquid surface replenishment water inlet 231 from the left at the front side controls a water area of S3.2.

[0170] …

[0171] The liquid surface replenishment water inlet 231 at the rightmost rear side controls a water area of Sn.1, and the liquid surface replenishment water inlet 231 at the rightmost front side controls a water area of Sn.2.

[0172] According to the calculation:

[0173] S1.1+S1.2=S2.1+S2.2=S3.1+S3.2=…=Sn.1+Sn.2 (Formula I).

[0174] Through the above design method, it can be ensured that the low-pressure water in the spinning solution surface cavity 240 remains stable when the low-pressure water is continuously replenished.

[0175] Further, Figure 13In the middle, the midpoint of the line connecting the centers of any two adjacent stretch panels 121 is taken as a division line L perpendicular to the length direction of the mounting rack plate 110, the total area of the water area is divided, and two end sub-areas A1 at both ends and a plurality of intermediate sub-areas A2 between the two end sub-areas A1 can be obtained.

[0176] It can be understood that the area of the end sub-area A1 at the left end is the sum of S1.1 and S1.2 plus the area of the circle N1. Similarly, the area of the intermediate sub-area A2 adjacent to the right side of the above-mentioned end sub-area A1 is the sum of S2.1 and S2.2 plus the area of the circle N2.

[0177] Since the areas of the circles N1, N2, N3, …, Nn are equal, by designing the area of the end sub-area A1 to be equal to the area of each intermediate sub-area A2, formula I can be satisfied.

[0178] As a specific embodiment, at the two end regions of the mounting rack plate 110, the static pressure hole plate 210 and the low-pressure water distribution cavity 230 are arranged to extend along an elliptical arc around the end of the mounting rack plate 110, and the specific values of the major axis and the minor axis of the elliptical arc can satisfy that the area of the end sub-area A1 is equal to the area of the intermediate sub-area A2.

[0179] Further, according to the principle that the effective circumferences of the liquid suction holes 1211 controlled by each liquid surface supplement water inlet 231 are consistent, it can be found that the interference areas of all the liquid suction holes 1211 in the spinning liquid surface cavity 240 are consistent, and then by arranging the low-pressure water distribution cavity 230 as an elliptical arc at the two ends of the mounting rack plate 110, the water distribution coefficient is artificially increased, and it can also be ensured that the liquid amount sucked by each liquid suction hole 1211 is consistent with the water amount supplemented through the corresponding liquid surface supplement water inlet 231.

[0180] In a further scheme of the embodiment of the application, the liquid surface static pressure hole plate assembly 200 further comprises a static pressure hole plate flange 220. Specifically, the static pressure hole plate flange 220 is connected to the upper side of the static pressure hole plate 210 and extends outward from the upper edge of the static pressure hole plate 210, thereby covering the top wall of the low-pressure water distribution cavity 230 on the outside. The static pressure hole plate flange 220 and the top wall of the low-pressure water distribution cavity 230 are fixed by screws, and a spillway gasket 600 is clamped therebetween for preventing water leakage through the gap between the top wall of the low-pressure water distribution cavity 230 and the static pressure hole plate 210.

[0181] As a specific embodiment, the spillway gasket 600 is a soft gasket with a certain compression amount, and the material of the spillway gasket 600 is selected from aluminum, rubber, asbestos rubber plate, PTFE or EPDM, etc. Preferably, the material of the spillway gasket 600 is selected from PTFE or EPDM.

[0182] In a further aspect, the multi-station coagulation and drawing device of the embodiment of the present application is provided with an overflow tank 300 outside the low-pressure water distribution chamber 230, which surrounds the low-pressure water distribution chamber 230, and the upper side of the overflow tank 300 is open. It should be noted that the low-pressure water in the spinning solution surface chamber 240 will not overflow in general when the multi-station coagulation and drawing device is stably working, but the provision of the overflow tank 300 can ensure that even if the low-pressure water overflows through the liquid surface static pressure hole plate assembly 200, it can also be collected in the overflow tank 300, so as to avoid the overflow water from falling on the ground of the production workshop or other production devices.

[0183] When the multi-station coagulation and drawing device of the embodiment of the present application is used for the preparation of cellulose fibers, the water flow speed in the mixing channel 1241 required is calculated according to the draft ratio of the fiber bundle of each spinning station and the traction coefficient of the water flow on the fiber bundle, and then the water pressure required by the high-pressure water and the low-pressure water required by the hydraulic drawing of each spinning station is calculated according to the design principle of the water flow injector. Then, the inner diameter of the high-pressure water branch pipe 430 and the low-pressure water branch pipe 530 corresponding to each spinning station is inversely calculated according to the flow speed, and then the inner diameter of each section of pipe, the number of elbows, and the inlet diameter of the high-pressure water main pipe 410 and the low-pressure water main pipe 510 are calculated according to the number of stations. This design and calculation method can ensure that the distance from the inlet to each hydraulic jet drawing assembly 120 is consistent, and the number of elbows is consistent, so as to ensure that the high-pressure water and the low-pressure water supplied at all the hydraulic jet drawing assemblies 120 are completely consistent in pressure.

[0184] The pressure jet equation is: v=C0×(2×△p / ρ) 0.5 ,

[0185] Wherein: v—flow speed of high-pressure water / low-pressure water;

[0186] C0—correction coefficient;

[0187] △p—pressure;

[0188] ρ—density of liquid;

[0189] The multi-station coagulation and drawing device provided by the embodiment of the present application has the following advantages:

[0190] 1. Through the equipment structure design, the stable and uniform supply of coagulation water flow of multiple stations is truly realized, and the stability of the coagulation circulation system is ensured;

[0191] 2. The coagulation bath liquid mixed by high-pressure water and low-pressure water maintains the same movement direction as the fiber bundle, the force of the coagulation bath liquid on the fiber bundle is a stretching force, and the coagulation of the fiber bundle is ensured to be sufficient and the multi-station draft tension is stable, so as to achieve the purpose of smooth and high-speed stretching, prevent single fiber breakage, and reduce lint and defects;

[0192] 3. The stretching speed and spinning speed can be adjusted by adjusting the matching of high-pressure water and low-pressure water and the size of the annular gap, which is conducive to spinning fiber tows of different deniers according to process requirements;

[0193] 4. The multi-in-one structure can arrange more spinning positions in a smaller space, which is more conducive to uniform and stable preparation, reducing equipment footprint and lowering equipment investment costs.

[0194] Examples 1-6

[0195] like Figures 1 to 15 As shown, in Examples 1-6, an octet-in-one coagulation and stretching device is designed, that is, it has eight water jet stretching components 120, which can simultaneously process the filament bundles formed by eight spinning positions.

[0196] Specifically, in the above embodiment, eight hydraulic jet stretching assemblies 120 are installed on the mounting frame plate 110, numbered from I to VIII, and the distance between the centers of the stretching panels 121 of any two adjacent hydraulic jet stretching assemblies 120 is 220 mm.

[0197] High pressure water is distributed in a way of one to two, two to four, and four to eight. Figure 14 The high-pressure water pipe assembly 400 is provided with seven high-pressure water three-way joints 440, namely one high-pressure water one-way two-way joint 461, two high-pressure water two-way four-way joints 462, and four high-pressure water four-way eight-way joints 463. Six high-pressure water intermediate pipes 420 are provided, namely two high-pressure water two-way pipes 451 and four high-pressure water four-way pipes 452. There are eight high-pressure water manifolds 430 in total, also called high-pressure water eight-way pipes 453. High-pressure water flows through the high-pressure water main pipe 410, the high-pressure water one-way two-way joint 461, the high-pressure water two-way pipe 451, the high-pressure water two-way four-way joint 462, the high-pressure water four-way pipe 452, the high-pressure water four-way eight-way joint 463 and the high-pressure water eight-way pipe 453 in sequence and enters the high-pressure chamber 1230. The diameter of each pipeline is: d h,主管 =56mm,d h,二分管 =40mm,d h,四分管 =28mm, d h,八分管 =20mm.

[0198] Low pressure water is distributed in the following ways: one part to two, two parts to four, four parts to eight, eight parts to sixteen. Figure 15The low-pressure water pipe assembly 500 is provided with fifteen low-pressure water tee joints 540, one low-pressure water one-to-two joint 561, two low-pressure water two-to-four joints 562, four low-pressure water four-to-eight joints 563, and eight low-pressure water eight-to-sixteen joints 564. The low-pressure water middle pipe 520 is provided with fourteen low-pressure water two-to-pipes 551, four low-pressure water four-to-pipes 552, and eight low-pressure water eight-to-pipes 553. The low-pressure water branch pipe 530 is provided with sixteen low-pressure water sixteen-to-pipes 554. The low-pressure water flows through the low-pressure water main pipe 510, the low-pressure water one-to-two joint 561, the low-pressure water two-to-pipe 551, the low-pressure water two-to-four joint 562, the low-pressure water four-to-pipe 552, the low-pressure water four-to-eight joint 563, the low-pressure water eight-to-pipe 553, the low-pressure water eight-to-sixteen joint 564, and the low-pressure water sixteen-to-pipe 554 in sequence, and enters the low-pressure water distribution chamber 230. The diameters of the pipes are as follows: d l,主管 = 80 mm, d l,二分管 = 56 mm, d l,四分管 = 40 mm, d l,八分管 = 28 mm, d l,十六分管 = 20 mm.

[0199] The structural parameters of the hydraulic jet stretching assembly 120 include: the taper angle of the liquid suction hole 1211 is 53.2°, the outer peripheral wall taper angle of the lower taper ring 1212 is 24.2°, the inner diameter of the lower end of the lower taper ring 1212 is d1 = 9.5 mm, the taper angle of the tapered inner wall at the upper end of the mixing chamber 124 is 25°, the taper angle of the outer taper surface is 66.7°, the taper angle formed by the inner wall of the diffusion pipe 125 is 4.2°, and the diameter of the mixing passage 1241 is d2 = 9 mm.

[0200] The opening rate of the static pressure orifice plate 210 is 0.62.

[0201] In Examples 1-6, by adjusting the high-pressure water pressure, the low-pressure water pressure, and the size of the gap δ, the hydraulic jet stretching assembly 120 obtains different water outlet speeds. The water outlet speeds of the eight hydraulic jet stretching assemblies 120 are tested, and the results are shown in Table 1.

[0202] It should be noted that in the above examples, the measurement method of the gap δ is as follows: after the mixing chamber 124 and the high-pressure jet cavity 123 are assembled, the position where the lower taper ring 1212 on the lower side of the stretching site panel 121 just contacts the tapered inner wall at the upper end of the mixing chamber 124 is taken as the reference position, and the height by which the mixing chamber 124 falls relative to the reference position is measured, which is the size of the gap δ.

[0203] Table 1: Water speed test results

[0204]

[0205] From the above test results, it can be seen that the eight-in-one coagulation and drawing device in the above embodiments can realize the adjustment of different water speeds by adjusting the high-pressure water pressure, the low-pressure water pressure, and the size of the gap δ, so as to adapt to different working condition requirements. The water outlet speeds of the eight hydraulic jet stretching assemblies 120 are basically consistent, indicating that the water distribution of the eight positions is uniform and consistent, meeting the use requirements of multiple positions in one.

[0206] Examples 7-12

[0207] A spinning solution with a cellulose concentration of 10% was prepared after mixing and dissolving the dissolving pulp with a polymerization degree of 520 and NMMO solvent. The temperature of the spinning solution during extrusion was 97°C, the spinneret hole diameter was Φ0.1 mm, the cooling side air gap was 30 mm, and the air blowing condition was constant. Then, the eight-in-one coagulation and drawing device mentioned in the above examples 1-6 was used for spinning test, and the test results of the prepared fiber bundle are shown in Table 2 below.

[0208] Table 2 Spinning test results

[0209]

[0210] From the above test data combined with the data in Table 1, it can be seen that at the same spinneret extrusion speed, with the change of water speed, the fiber receives different drawing tension, thereby having different draw ratio, and the fineness of the prepared fiber is different. Under the same working condition, the fineness of the fiber prepared by eight positions is basically consistent, the coefficient of variation is low, and the uniformity is good, indicating that the device of the application meets the use requirements of multiple positions in one, and different fineness of fiber products can be prepared according to technical requirements.

[0211] Comparative Example 1

[0212] This comparative example investigates the coagulation bath accelerating device for high-speed spinning of para-aramid fiber and the high-speed spinning process disclosed in Chinese Patent No. 201610218051.0. The device is composed of a funnel structure with adjustable height, a water tank, and a ring-shaped jet system.

[0213] However, it is found in actual application that the above device has a large floor area in the industrialization of cellulose fiber high-speed continuous spinning, and the number of spinning positions arranged in a unit space is small. Each position is controlled separately, which is easy to cause differences between positions, and is also relatively cumbersome in industrial production management, with high cost, and is not suitable for the field of low-value civilian textiles.

[0214] Comparative Example 2

[0215] The comparative example investigates the coagulation forming device for cellulose spinning disclosed in Chinese Patent No. 201811628171.3, which includes a coagulation bath tray, a supplementary water inlet pipe, a first multi-stage multi-hole grid, an acceleration water pipe, an acceleration water inlet pipe, a bath tray rack, a water outlet pipe, and a flow guide cone ring. The coagulation bath tray is arranged in the inner cavity of the tray rack, the center of the coagulation bath tray is provided with a first through hole, and the center of the tray rack is provided with a second through hole, wherein the first through hole is centered with the second through hole. The supplementary water inlet pipe passes through the side wall of the tray rack and is connected with the inner cavity of the coagulation bath tray. The first multi-stage multi-hole grid is arranged radially to the supplementary water inlet, the edge of the flow guide cone ring is fixedly connected to the inner side of the first through hole, so that the core hole of the flow guide cone ring is centered with the top end of the core hole of the acceleration water pipe. The acceleration water inlet pipe communicates with the acceleration water pipe. The bottom end of the acceleration water pipe communicates with and is centered with the water outlet pipe.

[0216] However, it is found in actual application that the coagulation bath tray in the above device has a too large diameter, occupies a large area in the industrialization of high-speed continuous spinning of cellulose fibers, and has fewer spinning positions per unit space; in the process of simultaneous spinning of multiple spinning positions in industrialization, once the pressure of the accelerated water fluctuates, it is easy to cause uneven and unstable stress of the yarn, uneven fineness, and easy to cause vortex in the high-speed mixing process, causing slight trembling of the yarn and twisting of the yarn together in the water flow mixing process, affecting the quality of fiber uniformity; the existence of the elbow of the water outlet pipe causes friction of the cellulose yarn on the inner cavity wall, the fibrillation phenomenon is aggravated for the yarn with fewer numbers and high linear velocity, and the fiber quality will be affected.

[0217] Comparative Example 3

[0218] The comparative example investigates the dry-jet wet spinning equipment provided by Chinese Patent No. 202210092875.3, which includes a melt pipeline, multiple jetting assemblies, a cooling air pipeline, a coagulation bath tank, and a bundle guide rod. The melt pipeline includes a first main pipeline and multiple first branch pipelines, and the first main pipeline and the first branch pipelines respectively communicate. The first branch pipeline corresponds to the jetting assembly one by one, and the first branch pipeline communicates with the corresponding jetting assembly, so that after passing through the multiple jetting assemblies, the spinning solution forms multiple groups of spinning streams. The cooling air pipeline is used to blow air to the multiple groups of spinning streams through a multi-directional air outlet. The bundle guide rod is arranged in the coagulation bath tank, so that the multiple groups of spinning streams complete the bundle guiding after passing through the bundle guide rod.

[0219] However, it is found in actual application that the above spinning equipment is only suitable for spinning processes with low stretching speed and a small amount of yarn winding or unevenness in the production process, which does not affect the quality of short yarn after cutting, and is not suitable for the high spinning speed condition mentioned in the present application.

[0220] It can be found by comparing the above examples and Comparative Examples 1-3 that the multi-position integrated coagulating bath accelerating device provided by the present application has wide industrial applicability for multi-position cellulose fiber production, can arrange more spinning positions in limited space, and can adapt to different spinning process requirements by adjusting the high-pressure water pressure, the low-pressure water pressure, and the gap width for forming the high-pressure jet, especially to meet the preparation requirements of high spinning speed, and is beneficial to reduce the doubling, lint, and fibrillation.

[0221] The above merely describes preferred embodiments of the present application and is not intended to limit the present application in any form. Although the present application has been disclosed above with preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above-mentioned technical content with equivalent embodiments of equivalent changes without departing from the technical solution range of the present application. Any simple modification, equivalent change, and modification of the above examples according to the technical essence of the present application still belong to the scope of the present application.

Claims

1. A multi-station coagulation stretcher characterized by, The utility model relates to a kind of high-pressure water jet spinning machine, including: Mounting rack plate; Several hydraulic jet stretching components are arranged on the mounting rack plate, with mixed channel for passing through filament bundle and coagulation bath liquid, and high-pressure cavity communicated with the mixed channel; High-pressure water pipe assembly includes a high-pressure water main pipe, and several high-pressure water branch pipes communicated with the high-pressure water main pipe respectively, and several high-pressure water branch pipes are communicated with the high-pressure cavity one by one; Low-pressure water distribution cavity is arranged on the upper side of the mounting rack plate, and is annular chamber around the outer periphery of the mounting rack plate, with several liquid level supplement water inlets distributed along the direction around the mounting rack plate, and the inner peripheral side wall of the low-pressure water distribution cavity is static pressure orifice plate with water outlet opening; Low-pressure water pipe assembly includes a low-pressure water main pipe, and several low-pressure water branch pipes communicated with the low-pressure water main pipe respectively, and each low-pressure water branch pipe is connected with the liquid level supplement water inlet on the low-pressure water distribution cavity one by one; The hydraulic jet stretching component includes stretching position panel arranged on the mounting rack plate, the center of the stretching position panel is provided with suction hole penetrating up and down, and the suction hole is communicated with the mixed channel;The lower surface of the stretching position panel has lower cone ring extending downward from the outer periphery of the suction hole, and the outer diameter gradually decreases, and the outer peripheral wall of the lower cone ring has taper angle β, and the inner diameter of the lower end of the lower cone ring is d1; The hydraulic jet stretching component further includes mixing chamber vertically extending downward from the lower side of the stretching position panel, and the high-pressure cavity is formed outside the mixing chamber, and the mixing chamber is hollow inside to form the mixed channel, and the lower cone ring is inserted into the mixed channel from the upper end of the mixing chamber;The inner diameter of the mixing chamber gradually decreases within a certain height downward from the upper end of the mixing chamber, to form tapered inner wall around the outer peripheral wall of the lower cone ring and spaced apart from the outer peripheral wall of the lower cone ring, and the tapered inner wall has taper angle γ;The inner peripheral wall of the mixing chamber vertically extends downward from the lower end of the tapered inner wall, and the inner diameter is d2; Wherein, β<γ, and d1≥d2; The interval distance between the outer periphery of the lower end surface of the lower cone ring and the corresponding position of the tapered inner wall at the upper end of the mixing chamber in the vertical direction is 0-20mm; The lower end of the mixing chamber is connected with vertically extending diffusion pipe, and the inner diameter of the diffusion pipe gradually increases from the upper end downward, to form taper angle κ;Wherein, 0°<κ<45.6°.

2. The multi-purpose coagulation stretcher of claim 1, wherein, The high-pressure water pipe assembly further includes at least one high-pressure water tee joint;The high-pressure water tee joint has one water inlet and two water outlets, and the two water outlets are symmetrically arranged relative to the axis of the water inlet; The high-pressure water main pipe is connected with two high-pressure water branch pipes through the high-pressure water tee joint;Or, the high-pressure water pipe assembly includes several high-pressure water tee joints, and further includes at least two high-pressure water intermediate pipes, and the high-pressure water main pipe is connected with two high-pressure water intermediate pipes through a high-pressure water tee joint, and each high-pressure water intermediate pipe is connected with another two high-pressure water intermediate pipes or two high-pressure water branch pipes through a high-pressure water tee joint.

3. The multi-purpose coagulation stretcher of claim 2, wherein, The inner diameter d of the high-pressure water pipe h,out The inner diameter d of the high-pressure water main h Satisfied: 0.707 n ×d h −1mm≤d h,out ≤0.707 n ×d h +1mm, where n is the number of high-pressure water tees between the high-pressure water main and the high-pressure water branch; or, the inner diameter d of the high-pressure water intermediate pipe h,mid and the inner diameter d of the high-pressure water main pipe h satisfies: 0.707 m × d h − 1 mm ≤ d h,mid ≤ 0.707 m × d h + 1 mm, where m is the number of high-pressure water tee joints between the high-pressure water main pipe and the high-pressure water intermediate pipe.

4. The multi-purpose coagulation stretcher of claim 2, wherein, First pressure sensor is arranged on the high-pressure water main pipe for obtaining high-pressure water pressure.

5. The multi-purpose coagulation stretcher of claim 1, wherein, The low-pressure water pipe assembly further comprises a plurality of low-pressure water tee joints and a plurality of low-pressure water intermediate pipes. The low-pressure water tee joint has one water inlet and two water outlets, and the two water outlets are symmetrically arranged relative to the axis of the water inlet. The low-pressure water main pipe is connected to two low-pressure water intermediate pipes through one low-pressure water tee joint; each low-pressure water intermediate pipe is connected to two other low-pressure water intermediate pipes or two low-pressure water branch pipes through one low-pressure water tee joint.

6. The multi-purpose coagulation stretcher of claim 5, wherein, The inner diameter d of the low-pressure water branch pipe l,out The inner diameter d of the low-pressure water main pipe l 0.707 s × d l −1 mm l,out ≤ 0.707 s × d l + 1 mm, wherein s is the number of low-pressure water tee joints between the low-pressure water main pipe and the low-pressure water branch pipe. Alternatively, the inner diameter d of the low-pressure water intermediate pipe is l,mid The inner diameter d of the low-pressure water main l Satisfied: 0.707 t ×d l −1mm≤d l,mid ≤0.707 t ×d l +1mm, where t is the number of low-pressure water tee joints between the low-pressure water main pipe and the low-pressure water intermediate pipe.

7. The multi-purpose coagulation stretcher of claim 6, wherein, A second pressure sensor for obtaining low-pressure water pressure is arranged on the low-pressure water main pipe.

8. The multi-purpose coagulation stretcher of claim 1, wherein, The opening rate η of the static pressure orifice plate is greater than or equal to 0.

30.

9. The multi-purpose coagulation stretcher of claim 8, wherein, The opening rate η is greater than or equal to 0.

52.

10. The multi-purpose coagulation stretcher of claim 1, wherein, The mounting rack plate has a certain extension length in the horizontal direction, and a plurality of stretching position panels are uniformly distributed along the length direction of the mounting rack plate; the stretching position panel has a circular contour, and the center of the circular contour coincides with the central axis of the mounting rack plate. The liquid surface supplement water inlets are arranged on the bottom wall of the low-pressure water distribution cavity, and the number of the liquid surface supplement water inlets is twice the number of the hydraulic jet stretching assemblies; the liquid surface supplement water inlets are arranged on both sides of the length direction of the mounting rack plate, and the center lines of the oppositely arranged liquid surface supplement water inlets pass through the center positions of the stretching position panels between them; the water area controlled by each liquid surface supplement water inlet on the upper side of the mounting rack plate is equal.

11. The multi-purpose coagulation stretcher of claim 10, wherein, The area surrounded by the downward projection line of the static pressure orifice plate constitutes the total water area on the upper side of the mounting rack plate; the total water area is divided by a plurality of division lines perpendicular to the length direction of the mounting rack plate, and the division lines pass through the midpoints of the center lines of any two adjacent stretching position panels, thereby obtaining two end sub-areas located at both ends and a plurality of intermediate sub-areas located between the two end sub-areas; The static pressure orifice plate extends along an elliptical arc in the end region of the mounting rack plate to encircle the end of the mounting rack plate, so that the area of the end sub-area and the area of each intermediate sub-area are equal.

12. The multi-purpose coagulation stretcher of any one of claims 1-11, wherein, The spacing distance between the lower end surface of the lower cone ring and the corresponding position of the conical inner wall at the upper end of the mixing chamber in the vertical direction is 0-10 mm.

13. The multi-purpose coagulation stretcher of any of claims 1-11, wherein, The liquid suction hole is a conical hole with a taper angle α, and the hole diameter gradually decreases from top to bottom. Wherein, 10°<α<85°, 3.5°<β<52.5°.

14. The multi-purpose coagulation stretcher of claim 13, wherein, 32°＜α＜55°，8.2°＜β＜36.8°。 15. The multi-purpose coagulation stretcher of any of claims 1-11, wherein, From the upper end of the mixing chamber to a certain height downward, the outer diameter of the mixing chamber gradually increases to form an outer taper surface with a taper angle θ. Wherein, 1.8°<γ<67.2°, 32°<θ<86.3°.

16. The multi-purpose coagulation stretcher of claim 15, wherein, 7.6°<γ<42.6°, 45°<θ<73.8°.

17. The multi-purpose coagulation stretcher of any of claims 1-11, wherein, The taper angle κ satisfies: 0°<κ<17.3°.

18. The multi-purpose coagulation stretcher of any one of claims 1-11, wherein, The hydraulic jet stretching assembly further comprises a high-pressure jet cavity mounted on the lower side of the mounting rack plate, the mixing chamber penetrates through the bottom wall of the high-pressure jet cavity and extends into the high-pressure jet cavity; the outer wall of the mixing chamber and the inner wall of the high-pressure jet cavity form the high-pressure cavity; The bottom wall of the high-pressure jet cavity is provided with a mounting portion for mounting the mixing chamber, and the mounting portion is threadedly connected with the side wall of the mixing chamber.

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