A water bath drafting device for cigarette polylactic acid fibers

Abstract

The present application relates to a kind of water bath drafting device of polylactic acid fiber for cigarette, belong to fiber manufacturing technical field, solve the problem of poor drafting effect, equipment redundancy complex, high energy consumption.The water guide plate is arranged inside water bath, the water body discharged in heating box flows from high to low along the upper surface of water guide plate;Drafting roller assembly is used to draft polylactic acid fiber, while making the filament immersed in the water above water guide plate to carry out filament water bath;Water guide pipe is arranged in the bottom of water bath, and the water in water guide pipe is pumped into heating box by water pump to carry out water medium circulation;At least two filter boxes are arranged on water guide plate, filter box separates water guide plate into at least three sections;Filter box is used to filter impurities in water body, while cooling assembly is arranged below filter box, cooling assembly is used to cool the water flowing through filter box.The present application realizes the water bath drafting of filament in water body with gradually reducing temperature, guarantees drafting effect while avoiding filament breakage.

Description

Technical Field

[0001] This invention relates to the field of fiber manufacturing technology, and in particular to a water bath drawing device for polylactic acid fibers used in tobacco. Background Technology

[0002] Cigarette filters made of polylactic acid (PLA) fiber are not only low in cost but also biodegradable. Furthermore, their polar molecular structure determines their ability to adsorb and remove harmful components in cigarette smoke. Therefore, PLA fiber is gradually replacing cellulose diacetate and polypropylene as the material for cigarette filters. PLA fiber is produced using a melt spinning process, and after being filamentized, it needs to be stretched in a water bath.

[0003] Existing water bath drawing tanks, by incorporating auxiliary tanks and placing the replenishment tank externally, achieve the goal of reducing the volume of the main tank, making the main tank depth suitable, and not occupying space. However, since the main tank has a certain length, and the hot water in the replenishment tank is first injected into one end of the main tank, it leads to uneven temperature distribution at both ends of the main tank, which is not conducive to the water bath drawing effect when multiple fibers are drawn simultaneously. Alternatively, multiple water bath chambers with different water temperatures can be set up to progressively heat the fibers, but each water bath chamber needs to be equipped with a water pump and a heating unit. At the same time, in order to prevent broken wires from tangling, a wire breakage detection unit is required, which is completed by multiple optical detection units, increasing equipment costs and hindering widespread use.

[0004] Therefore, there is a need to provide a new polylactic acid fiber preparation device to improve the stretching effect and minimize costs. Summary of the Invention

[0005] Based on the above analysis, the present invention aims to provide a water bath drawing device for polylactic acid fibers used in tobacco, in order to solve the problems of poor water bath drawing effect and high cost of existing water bath drawing devices.

[0006] The objective of this invention is mainly achieved through the following technical solutions:

[0007] A water bath drawing device for polylactic acid fiber for tobacco use, characterized in that it comprises: a water bath, a water guide plate, a filter box, a guide roller assembly, a circulating heating assembly, and a cooling assembly;

[0008] The water guide plate is inclinedly arranged inside the water bath, and the internal space of the water bath is divided into an upper part and a lower part by the water guide plate. The upper part is used for fiber bundle water bath, and the lower part is used for water medium circulation.

[0009] The circulating heating assembly includes: a heating box, a water pipe, and a water pump;

[0010] The heating box is used to heat water; the water discharged from the heating box flows from high to low along the upper surface of the water guide plate; the lower end of the water guide plate is provided with a drain hole, which connects the upper half and the lower half of the water bath.

[0011] The water guide pipe is located at the bottom of the water bath and is used to recover the water after the fiber bundle water bath; the water pump can pump the water in the water guide pipe into the heating box for water medium circulation.

[0012] The guide roller assembly is used to draw polylactic acid fibers, and at the same time, the polylactic acid fibers are immersed in the water above the water guide plate for a fiber bundle water bath during the drawing process.

[0013] At least two filter boxes are provided on the water guide plate, and the filter boxes divide the water guide plate into at least three sections. The filter boxes are used to filter impurities in the water. At the same time, a cooling component is provided below the filter box to cool the water flowing through the filter box.

[0014] The cooling assembly includes: a fixed cover, a connecting pipe, and a mounting box; the fixed cover covers the outside of the filter box, and its side is connected to the mounting box through the connecting pipe; a rotatable axial fan blade is installed in the mounting box, and when the axial fan blade rotates, it can promote the flow of air from the connecting pipe into the fixed cover, thereby blowing air to cool the filter box.

[0015] Furthermore, a through groove is provided on the water guide plate, and the filter box is fixedly installed in the through groove and located below the water guide plate; a baffle plate and a filter screen are provided inside the filter box; the baffle plate is arranged perpendicular to the water guide plate, and its upper end protrudes from the upper surface of the water guide plate; the filter screen is installed between the baffle plate and the filter box, so that the baffle plate and the filter screen can divide the internal cavity of the filter box into left and right parts; when the water flows through the filter screen, it can filter impurities.

[0016] Furthermore, the two ends of the fixing cover are fixedly connected to the inner wall surfaces on both sides of the water bath, the side of the water bath is provided with ventilation holes, and one end of the fixing cover is connected to the ventilation holes.

[0017] Furthermore, a transmission box is installed on the water guide pipe; a vertical rod and blades are installed in the transmission box; the lower end of the vertical rod is rotatably connected to the transmission box, and the upper end is fixedly connected to the axial flow fan blades; the blades are fixedly installed on the outside of the vertical rod, and multiple blades are arranged along the circumference of the vertical rod; when the water in the water guide pipe flows through the transmission box, it can drive the blades to rotate; when the blades rotate, they can drive the vertical rod and the axial flow fan blades to rotate.

[0018] Furthermore, the outer side of the filter box is provided with multiple heat-conducting fins for heat dissipation.

[0019] Furthermore, the side of the water bath is provided with an air inlet; the bottom of the mounting box has an opening, or the mounting box is connected to the air inlet through an air inlet pipe.

[0020] Furthermore, the guide roller assembly includes: a rotating roller, a guide roller, a traction roller, a first pressure roller, a second pressure roller, and a third pressure roller;

[0021] The guide roller and the traction roller are respectively located at both ends of the water bath, and the two rotate at different speeds, which are used to guide the polylactic acid fiber bundles and achieve stretching.

[0022] The first pressing roller and the second pressing roller are respectively disposed above the water guide plate, and are used to press the polylactic acid fiber bundles into the water above the water guide plate;

[0023] Each of the water baffles has a rotating roller rotatably mounted on its upper end; each of the rotating rollers has two third pressing rollers on both sides; the multiple third pressing rollers, the first pressing roller, and the second pressing roller are located on the same straight line; the rotating roller is positioned above the straight line formed by the connection of the first pressing roller and the second pressing roller.

[0024] Furthermore, it also includes: a broken fiber detection component; the broken fiber detection component includes: a fixing frame, a metal spring, a guide pulley, and a limiting rod; the fixing frame is in the shape of a "door" and is fixedly installed on the water bath; multiple metal springs are arranged side by side on the crossbeam of the fixing frame; the end of the metal spring is rotatably mounted with a guide pulley, one end of the limiting rod is fixedly connected to the crossbeam of the fixing frame, and the other end is located on one side of the metal spring; the polylactic acid fiber bundle passes around the guide pulley, and thus the pressure on the guide pulley during the drawing of the bundle can press the metal spring against the end of the limiting rod so that the two abut against each other.

[0025] Furthermore, a heat exchange box is slidably installed in the fixed cover; the heat exchange box is filled with a cooling medium capable of cooling the filter box.

[0026] Furthermore, the heat exchange box is U-shaped; the outer side of the heat exchange box is in contact with the inner wall of the fixed cover, and does not obstruct the air outlet of the connecting pipe; the inner side of the heat exchange box is in contact with the outer surface of the filter box.

[0027] The technical solution of this invention can achieve at least one of the following effects:

[0028] 1. The water bath drawing device for polylactic acid fibers for tobacco of the present invention, by setting an inclined water guide plate and setting a filter box on the water guide plate, heats the filter box to cool it down, so that the temperature of the water flowing through the filter box decreases, thereby achieving a stepped temperature distribution of the water flow on the water guide plate, with the temperature of the water flow above the water guide plate decreasing step by step from high to low; when performing water bath drawing of polylactic acid fiber bundles, the higher the water temperature of the bundle in the water bath, the easier it is to draw and deform; the lower the temperature of the bundle in the water bath, the higher the degree of solidification of the bundle, which is beneficial to improving the structural strength of the bundle after drawing and preventing the bundle from breaking.

[0029] 2. The polylactic acid fiber water bath stretching device for tobacco of the present invention drives water flow to circulate between the heating box, water bath and water pipe through a water pump, thereby realizing the recycling of water and saving energy.

[0030] 3. The polylactic acid fiber water bath stretching device for tobacco of the present invention drives the blades in the transmission box to rotate through the flow of water in the water guide pipe, and then drives the axial flow fan blades to rotate through the vertical rod, blowing low-temperature air into the fixed cover through the connecting pipe, thereby achieving heat dissipation of the filter box through the blowing, and thus reducing the temperature of the water flowing through the filter box. By cooling the water, water of different temperatures can be supplied. Compared with the existing multi-group water heating device, the energy consumption and product cost of the product are reduced.

[0031] 4. The polylactic acid fiber water bath stretching device for tobacco of the present invention is provided with a broken fiber detection component. The tension of the fiber bundle during stretching provides a clamping force on the guide pulley, which in turn presses down the metal spring. When a broken fiber occurs, the clamping force disappears, and the end of the metal spring bounces up to realize the broken fiber detection. At the same time, the guide pulley moves synchronously with the end of the metal spring, causing the broken fiber to pop out, preventing the broken fiber from entangled with other fiber bundles.

[0032] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0033] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0034] Figure 1 This is a schematic diagram of the internal structure of the water bath stretching device for polylactic acid fibers used in tobacco products according to the present invention.

[0035] Figure 2 This is a top view of the polylactic acid fiber water bath stretching device for tobacco products according to the present invention;

[0036] Figure 3 This is an exploded structural diagram of the filter box and water baffle of the polylactic acid fiber water bath stretching device for tobacco of the present invention;

[0037] Figure 4 for Figure 1 Enlarged view of point A in the middle;

[0038] Figure 5 This is a cross-sectional view of the first pressing roller and the rotating rod of the water bath drawing device for polylactic acid fibers for tobacco of the present invention;

[0039] Figure 6 This is a top cross-sectional view of the transmission box of the polylactic acid fiber water bath stretching device for tobacco products of the present invention.

[0040] Figure 7 This is a top cross-sectional view of the heating box of the polylactic acid fiber water bath stretching device for tobacco products of the present invention;

[0041] Figure 8 for Figure 1 Enlarged view of point B in the middle;

[0042] Figure 9 This is a side view of the fixing frame and metal spring sheet of the polylactic acid fiber water bath stretching device for tobacco of the present invention;

[0043] Figure 10 A side view of the water bath structure of the polylactic acid fiber water bath stretching device for tobacco of the present invention, showing the ventilation holes provided.

[0044] Figure 11 A side view of the water bath of the polylactic acid fiber water bath stretching device for tobacco of the present invention, showing the air inlet hole provided.

[0045] Figure 12 This is a schematic diagram of the heat exchange box of the polylactic acid fiber water bath stretching device for tobacco products of the present invention.

[0046] Figure label:

[0047] 1-Water bath; 2-Water guide plate; 3-Through groove; 4-Filter box; 5-Drain hole; 6-Water baffle; 7-Filter screen; 8-Vertical plate; 9-Rotating roller; 10-Clamping block; 11-Guide roller; 12-Traction roller; 13-First pressure roller; 14-Second pressure roller; 15-Third pressure roller; 16-Fixing plate; 17-Rotating rod; 18-Fixing frame; 19-Metal spring; 20-Side plate; 21-Guide pulley; 22-Limiting rod; 23-Partition plate ; 24-Water collection chamber; 25-First conduit; 26-Second conduit; 27-Third conduit; 28-Heating box; 29-Heating wire; 30-Water outlet; 31-Transmission box; 32-Vertical rod; 33-Blade; 34-Mounting box; 35-Fixing cover; 36-Heat-conducting fins; 37-Connecting pipe; 38-Ventilation hole; 39-Air inlet; 40-Heat exchange box; 41-Medium tank; 42-Handle; 43-Inner side of heat exchange box; 44-Outer side of heat exchange box. Detailed Implementation

[0048] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0049] Example 1

[0050] A specific embodiment of the present invention discloses a water bath drawing device for polylactic acid fibers used in tobacco processing, such as... Figure 1 As shown, the system includes: a water bath 1, a water guide plate 2, a filter box 4, a guide roller assembly, a circulating heating assembly, and a cooling assembly. The water guide plate 2 is inclinedly arranged inside the water bath 1, and the internal space of the water bath 1 is divided into an upper half and a lower half by the water guide plate 2. The upper half is used for the fiber bundle water bath, and the lower half is used for water medium circulation. The circulating heating assembly includes: a heating box 28, a water guide pipe, and a water pump. The heating box 28 is used to heat the water. The water discharged from the heating box 28 flows from high to low along the upper surface of the water guide plate 2. The lower end of the water guide plate 2 is provided with a drain hole 5, which connects the upper half of the water bath 1 and... The lower half; the guide roller assembly is used to draw polylactic acid fibers, and at the same time, the polylactic acid fibers are immersed in the water above the water guide plate 2 for fiber bundle water bath during drawing; the water guide pipe is set at the bottom of the water bath pool 1 for recycling the water after the fiber bundle water bath; the water pump can pump the water in the water guide pipe into the heating box 28 for water medium circulation; at least two filter boxes 4 are set on the water guide plate 2, and the filter boxes 4 divide the water guide plate 2 into at least three sections; the filter boxes 4 are used to filter impurities in the water, and a cooling component is set below the filter boxes 4 for cooling the water flowing through the filter boxes 4.

[0051] When preparing polylactic acid fibers using the water bath drawing device for tobacco of the present invention, firstly, the raw materials are mixed according to a specified ratio and then melt-extruded; the extruded fiber bundles are placed into the water bath drawing device of the present invention and drawn by the guide roller assembly; and the water-bath drawn fiber bundles are then curled and dried for shaping.

[0052] The various components of this invention will be described in detail below:

[0053] I: Water guide plate 2

[0054] Specifically, such as Figure 2 As shown, the bottom of the water guide plate 2 is provided with multiple drainage holes 5. The interior of the water bath 1 is divided into upper and lower parts by the water guide plate 2. The upper part is used for the filament water bath, and the lower part is used for water medium circulation. The hot water flowing out of the heating box 28 flows through the upper surface of the multiple water guide plates 2 and the filter box 4 in sequence, and then flows into the water collection cavity 24 below the water guide plate 2 through the multiple drainage holes 5.

[0055] Preferably, the inclination angle of the water guide plate 2 is less than 20°.

[0056] Preferably, the surface of the water guide plate 2 is provided with corrugations extending along the direction of the filament movement; the trough area of ​​the corrugations has a certain water storage function, which can reduce the flow speed of the water, and at the same time, the trough has the effect of promoting the water to extend perpendicular to the direction of the filament movement, so that the water is evenly distributed on the surface of the water guide plate 2, thereby enabling multiple rows of filaments to be immersed in the water and the water temperature to tend to be uniform.

[0057] Specifically, such as Figure 2 As shown, the two sides of the water guide plate 2 are sealed to the inner wall of the water bath 1.

[0058] Specifically, the side wall of the water guide plate 2 is welded to the inner wall of the water bath 1. When the water flows in the upper part, the wire bundle water bath can be carried out. After the water flows to the lower part through the drain hole 5, it can be heated and flow back to the upper part, thereby realizing the water circulation and continuous water bath operation.

[0059] II: Circulating heating component

[0060] like Figure 1 As shown, a partition 23 is welded to the inner wall of the water bath 1, and the partition 23 is vertically arranged between the water guide plate 2 and the bottom plate of the water bath 1.

[0061] Specifically, the drain hole 5 is located between the partition plate 23 and the wall of the water bath 1; the upper end of the partition plate 23 is welded and fixed to the water guide plate 2, the lower end of the partition plate 23 is welded and fixed to the bottom plate of the water bath 1, and the two sides of the partition plate 23 are in sealed contact or sealed connection with the two side walls of the water bath 1, thereby forming a water collection cavity 24 between the partition plate 23, the water guide plate 2 and the inner wall of the water bath 1.

[0062] The water collection chamber 24 is connected to the drain hole 5, thus the water collection chamber 24 can collect the water flowing down from the drain hole 5. When the water flows through the drain hole 5 on the water guide plate 2 to the water collection chamber 24, it is guided through the water guide pipe. The water in the water guide pipe is pumped into the heating box 28 by the water pump. The heating box 28 is set at the upper end of the water bath 1, so that after the water is heated, it will flow into the top of the water guide plate 2 through the water outlet 30. In this way, the water can flow down the water guide plate 2 again, so that the water can continuously flow on the surface of the water guide plate 2 to ensure the circulation of the water bath operation.

[0063] III: Filter Box 4

[0064] like Figure 2 , Figure 3 As shown, the water guide plate 2 is provided with a through groove 3, and the filter box 4 is fixedly installed in the through groove 3 and located below the water guide plate 2; the filter box 4 is provided with a baffle plate 6 and a filter screen 7 inside; the baffle plate 6 is set perpendicular to the water guide plate 2, and its upper end protrudes from the upper surface of the water guide plate 2; the filter screen 7 is installed between the baffle plate 6 and the filter box 4, so that the baffle plate 6 and the filter screen 7 can divide the internal cavity of the filter box 4 into left and right parts; when the water flows through the filter screen 7, it can filter impurities.

[0065] like Figures 1-4 As shown, a set of through grooves 3 are provided on the water guide plate 2. A filter box 4 is inserted into the through groove 3 and welded to it. A water blocking component is inserted inside the filter box 4. The water blocking component includes a water blocking plate 6 and a filter screen 7. The filter screen 7 is welded to the water blocking plate 6.

[0066] Specifically, such as Figure 3 As shown, the filter screen 7 is inserted into the filter box 4 and fits against the inner wall of the filter box 4.

[0067] Specifically, two clamping blocks 10 are welded to the inner walls of both sides of the filter box 4, and the inner sides of the two clamping blocks 10 are in contact with the two end sides of the baffle plate 6.

[0068] Preferably, the baffle plate 6 and the retaining block 10 are connected by magnetic attraction. Specifically, a first magnet is embedded in the retaining block 10 at the position where it fits against the baffle plate 6, and the baffle plate 6 is made of metal or has a second magnet with opposite magnetic poles to the first magnet. When the baffle plate 6 is inserted between the two retaining blocks 10, the two are attracted by magnetic force. The baffle plate 6 of the present invention is inserted into the filter box 4 by magnetic attraction, which allows for quick insertion and removal, facilitates installation and disassembly, and cleaning of the filter screen 7, and prevents the baffle plate 6 from shaking.

[0069] Furthermore, the two baffles 6 in the filter box 4 can divide the water guide plate 2 into three sections, each of which can form a water bath area. Due to the setting of the baffles 6, the water must flow through the filter box 4 when it flows down the water guide plate 2. The water is filtered by the filter screen 7 in the filter box 4 and then flows out of the filter box 4 from the other side of the baffles 6 to ensure the cleanliness of the water. At the same time, the temperature of the water can be controlled by cooling the filter box 4.

[0070] Furthermore, such as Figure 3 , Figure 4 As shown, the outer side of the filter box 4 is provided with a plurality of heat-conducting fins 36 for heat dissipation.

[0071] like Figure 4 As shown, the heat-conducting fins 36 are rectangular plate structures; multiple heat-conducting fins 36 are integrally formed on both outer walls of the filter box 4. The filter box 4, together with the heat-conducting fins 36, can conduct heat and dissipate heat from the water flow, thereby reducing the water temperature and making the temperature of each water bath zone different. This is beneficial to the stretching effect of the filament bundle when it passes through three water bath zones with different temperatures, thus improving the strength of the filament bundle.

[0072] IV: Cooling Components

[0073] like Figure 3 , Figure 4 As shown, the cooling assembly includes: a fixed cover 35, a connecting pipe 37, and a mounting box 34. The number of fixed covers 35 is the same as that of the filter boxes 4; each filter box 4 is covered by a fixed cover 35, and the side of the fixed cover 35 is connected to the mounting box 34 through the connecting pipe 37; a rotatable axial fan blade is installed in the mounting box 34, and when the axial fan blade rotates, it can promote the flow of air from the connecting pipe 37 into the fixed cover 35, thereby blowing air to dissipate heat from the filter box 4.

[0074] Specifically, the side of the water bath 1 is provided with ventilation holes 38, and both ends of the fixing cover 35 are fixedly connected to the inner walls on both sides of the water bath 1, with one end communicating with the ventilation holes 38; for example Figure 10 As shown.

[0075] like Figure 1 and Figure 4 As shown, a fixing cover 35 is fitted around the filter box 4. The fixing cover 35 has a U-shaped cross-section. Both ends of the fixing cover 35 are welded to the inner wall of the water bath 1, and the top of the fixing cover 35 is welded to the bottom surface of the water guide plate 2. A ventilation hole 38 is provided on the wall of the water bath 1. One end of the fixing cover 35 is connected to the ventilation hole 38. A connecting pipe 37 is welded to the side wall of the fixing cover 35. The connecting pipes 37 on the two fixing covers 35 are connected by a T-junction.

[0076] As the water flows continuously on the surface of the water guide plate 2, in order to ensure the heat conduction effect of the heat conduction fins 36, the heat conduction fins 36 need to be cooled. Therefore, the airflow generated by the axial fan blades can enter the connecting pipe 37 through the tee, and finally the airflow enters the fixed cover 35, and finally exits from the ventilation holes on the wall of the water bath 1. The continuous flow of air accelerates the heat conduction efficiency of the heat conduction fins 36, so that the heat conduction fins 36 can always cool the water flow.

[0077] like Figure 6 As shown, a transmission box 31 is installed on the water guide pipe; a vertical rod 32 and blades 33 are installed in the transmission box 31; the lower end of the vertical rod 32 is rotatably connected to the transmission box 31, and the upper end is fixedly connected to the axial flow fan blades; the blades 33 are fixedly installed on the outside of the vertical rod 32, and multiple blades are arranged circumferentially; when the water in the water guide pipe flows through the transmission box 31, it can drive the blades 33 to rotate; when the blades 33 rotate, they can drive the vertical rod 32 and the axial flow fan blades to rotate.

[0078] like Figure 1 As shown, one end of the water pipe is connected to the water collection chamber 24, and the other end is connected to the heating box 28; the water pump is installed on the water pipe.

[0079] Specifically, the water conduit includes: a first conduit 25, a second conduit 26, and a third conduit 27.

[0080] The first conduit 25 is connected to the water collection chamber 24 at one end and to the transmission box 31 at the other end; the second conduit 26 is connected to the transmission box 31 at one end and to the water pump at the other end; the third conduit 27 is connected to the water pump at one end and to the heating box 28 at the other end.

[0081] Specifically, such as Figure 1As shown, a water pump is bolted to the inner wall of the water bath 1. The inlet and outlet ends of the water pump are connected to a second conduit 26 and a third conduit 27 via flanges, respectively. The second conduit 26 is connected to the first conduit 25 via a transmission box 31. The first conduit 25 passes through the partition 23 and extends into the water collection chamber 24. One end of the third conduit 27 passes through the water bath 1 and is connected to the bottom of the heating box 28. Thus, the water pump can draw out the water accumulated in the water collection chamber 24 and pump it into the heating box 28. After being heated again by the heating box 28, the water flows out to the water guide plate 2 for water bath stretching operation, realizing the circulation and use of the water.

[0082] Specifically, such as Figure 6 As shown, the first conduit 25 and the second conduit 26 are offset in the radial direction of the transmission box 31, so that when the water flows between the first conduit 25, the transmission box 31 and the second conduit 26, it can drive the blades 33 inside the transmission box 31 to rotate.

[0083] like Figure 1 , Figure 7 As shown, the heating box 28 is located on one side of the water bath 1. A set of heating wires 29 are installed on the inner wall of the heating box 28, and multiple water outlet holes 30 are opened on the side of the heating box 28 facing the water guide plate 2. After the water is heated in the heating box 28 by the heating wires 29, it flows out through the water outlet holes 30 and then flows to the water guide plate 2 to perform water bath stretching of polylactic acid fibers.

[0084] Specifically, such as Figure 1 , Figure 6 As shown, the transmission box 31 is a hollow cylinder. A vertical rod 32 is connected to the center of the top wall of the transmission box 31 via a bearing. The vertical rod 32 penetrates the top wall of the transmission box 31, with its bottom end extending into the transmission box 31 and its top end extending into the mounting box 34. A blade 33 is fixed to the outer cylindrical surface of the end of the vertical rod 32 inside the transmission box 31 by a locking pin, and an axial flow fan blade is fixed to the end of the vertical rod 32 extending into the mounting box 34 by a locking pin. When the water flow in the water pipe drives the blade 33 to rotate, the blade 33 drives the axial flow fan blade to rotate synchronously via the vertical rod 32.

[0085] Furthermore, such as Figure 11 As shown, the side of the water bath 1 is also provided with an air inlet 39; used to introduce ambient air into the interior of the water bath 1. Specifically, the air inlet 39 connects to the space in the water bath 1 located below the water guide plate 2 and is located outside the water collection cavity 24.

[0086] Furthermore, the mounting box 34 has multiple openings at its bottom, which are connected to the air inlet 39 of the water bath 1, thereby providing air to blow onto the fixing cover 35. The air flows sequentially through the air inlet 39, the openings at the bottom of the mounting box 34, and the connecting pipe 37 into the fixing cover 35, achieving heat dissipation from the airflow onto the filter box 4. Alternatively, the mounting box 34 is connected to the air inlet 39 via an air inlet pipe; air enters the interior of the mounting box 34 through the air inlet pipe, then passes through the axial fan blades into the connecting pipe 37 and the fixing cover 35, and flows out from the side of the fixing cover 35, achieving heat dissipation from the airflow onto the filter box 4.

[0087] Furthermore, the number of connecting pipes 37 is the same as the number of fixing covers 35, and each fixing cover 35 has a connecting pipe 37 connected to its side. Multiple connecting pipes 37 are directly connected to the mounting box 34; or multiple connecting pipes 37 are connected to the mounting box 34 through a multi-port structure.

[0088] For example, such as Figure 1 As shown, there are two connecting pipes 37 and two fixing covers 35. The two connecting pipes 37 are respectively connected to the two ports of the three-way pipe. The top of the mounting box 34 is connected to the remaining port of the three-way pipe through a flexible tube. When the axial fan blades in the mounting box 34 rotate, they can blow air into the three-way pipe, which then splits the air into the two connecting pipes 37, and finally blows the air into the fixing cover 35 through the two connecting pipes 37.

[0089] Furthermore, the mounting box 34 is fixedly installed above the transmission box 31. When water flows into the transmission box 31, the power of the water flow will drive the vertical rod 32 to rotate. In turn, the vertical rod 32 can drive the axial fan blades to rotate inside the mounting box 34. The rotating axial fan blades can generate airflow. The airflow flows into the fixed cover 35 through the connecting pipe 37. After exchanging heat with the filter box 4 and the heat-conducting fins 36, it is discharged through the ventilation hole 38 on the side of the water bath 1.

[0090] V: Guide roller assembly

[0091] like Figure 1 As shown, the guide roller assembly includes: a rotating roller 9, a guide roller 11, a traction roller 12, a first pressure roller 13, a second pressure roller 14, and a third pressure roller 15;

[0092] The guide roller 11 and the traction roller 12 are respectively disposed at both ends of the water bath 1, and the two rotate at different speeds, which are used to guide the polylactic acid fiber bundles and achieve stretching.

[0093] The first pressing roller 13 and the second pressing roller 14 are respectively disposed at both ends of the water guide plate 2, and are used to press the polylactic acid fiber bundles into the water above the water guide plate 2;

[0094] Each of the water baffles 6 has a rotating roller 9 rotatably mounted on its upper end; each of the rotating rollers 9 has two third pressing rollers 15 on each side; the multiple third pressing rollers 15, the first pressing roller 13 and the second pressing roller 14 are located on the same straight line; the rotating roller 9 is located above the straight line formed by the connection of the first pressing roller 13 and the second pressing roller 14.

[0095] Specifically, such as Figure 3 , Figure 4 As shown, two vertical plates 8 are welded to the top of the baffle plate 6. The two vertical plates 8 are set perpendicular to the baffle plate 6 and are located at the left and right ends of the baffle plate 6. A rotating roller 9 is rotatably connected between the two vertical plates 8 through a rotating shaft.

[0096] like Figure 1 , Figure 2 and Figure 5 As shown, the guide roller assembly includes a guide roller 11 and a traction roller 12 located at both ends of the water bath 1, and a first pressure roller 13, a second pressure roller 14 and a third pressure roller 15 located between the guide roller 11 and the traction roller 12; the third pressure roller 15 is arranged in pairs, and at least two pairs are provided.

[0097] like Figure 2 As shown, both ends of the multiple third pressure rollers 15 and the second pressure roller 14 are rotatably connected to the two fixed plates 16 via bearings; therefore, the second pressure roller 14 and the third pressure roller 15 can rotate relative to the fixed plate 16, and when the fixed plate 16 is displaced, the second pressure roller 14 and the third pressure roller 15 are also displaced synchronously.

[0098] Specifically, such as Figure 2 , Figure 5 As shown, one end of each of the two fixed plates 16 is provided with a rotating rod 17 welded to it, and both ends of the rotating rod 17 pass through the two fixed plates 16; both ends of the rotating rod 17 are movably connected to the bearings on the side wall of the water bath 1, and are driven to rotate by a motor; when the rotating rod 17 rotates, the fixed plates 16 also rotate synchronously.

[0099] like Figure 1 , Figure 2 As shown, when the rotating rod 17 rotates, the fixed plate 16 also rotates around the rotating rod 17 as an axis, causing multiple third pressing rollers 15 and second pressing rollers 14 to move relative to the water bath 1; then multiple third pressing rollers 15 and second pressing rollers 14 are pressed down into the water above the water guide plate 2.

[0100] Furthermore, the first pressing roller 13 is a hollow cylindrical tube and is sleeved on the rotating rod 17 through a bearing, so that the first pressing roller 13 can rotate relative to the rotating rod 17.

[0101] Specifically, such as Figure 2As shown, the portions of the baffle plate 6 that protrude from the filter box 4 are sealed and fitted with the fixing plate 16. In this way, the water flow will only flow on the surface of the guide plate 2, and when it flows, it will flow into the filter box 4 under the obstruction of the baffle plate 6. Then, after passing through the filter screen 7, it will flow out from the other side of the filter box 4 to the next section of the guide plate 2.

[0102] Before the water bath operation, the filament bundle on the guide roller 11 is passed through the bottom of the first pressure roller 13, the second pressure roller 14 and the third pressure roller 15 in sequence, and wound and fixed on the traction roller 12. Then, the rotating rod 17 is driven to rotate by the motor, and the rotating rod 17 drives the fixed plate 16 to rotate. The fixed plate 16 screws the second pressure roller 14 and the third pressure roller 15 into the water bath 1. In this way, the filament bundle can be pressed into the water above the water guide plate 2. In addition, the rotating roller 9 lifts the middle part of the filament bundle upward, so that the filament bundle is in a taut state and the filament bundle is prevented from scratching the water baffle plate 6.

[0103] Furthermore, by changing the linear speed ratio of the traction roller 12 and the guide roller 11, after adjusting to a suitable draw ratio, the filament bundle can be continuously moved to undergo a water bath, while simultaneously stretching the filament bundle.

[0104] VI: Broken Wire Detection Component

[0105] In one specific embodiment of the present invention, such as Figure 8 , Figure 9 As shown, it also includes: a broken fiber detection component; the broken fiber detection component includes: a fixing frame 18, a metal spring 19, a guide pulley 21, and a limiting rod 22; the fixing frame 18 is in the shape of a "door" and is fixedly installed on the water bath 1; multiple metal springs 19 are arranged side by side on the crossbeam of the fixing frame 18; the end of the metal spring 19 is rotatably mounted with the guide pulley 21, one end of the limiting rod 22 is fixedly connected to the crossbeam of the fixing frame 18, and the other end is located on one side of the metal spring 19; the polylactic acid fiber bundle passes around the guide pulley 21, and then when the bundle is stretched, the pressure on the guide pulley 21 can press the metal spring 19 tightly against the end of the limiting rod 22 so that the two abut against each other.

[0106] like Figure 1 , Figure 8 and Figure 9 As shown, a wire breakage detection assembly is installed directly below the traction roller 12. The fixing frame 18 of the wire breakage detection assembly is fixedly installed by welding at the end of the water bath 1 where the heating box 28 is not installed. Furthermore, multiple metal springs 19 are welded at equal intervals on the fixing frame 18.

[0107] Specifically, such as Figure 8As shown, two side plates 20 are welded to the bottom front of the metal spring 19, and a guide wire pulley 21 is rotatably installed between the two side plates 20 through a bearing and a rotating shaft.

[0108] Specifically, such as Figure 8 As shown, the bottom back of the metal spring 19 abuts against the end of the limiting rod 22, and the other end of the limiting rod 22 is welded and fixed to the fixing frame 18.

[0109] Specifically, such as Figure 9 As shown, multiple metal springs 19 and multiple guide pulleys 21 are arrayed, which enables simultaneous detection of broken fibers in multiple groups of polylactic acid fiber bundles.

[0110] When the traction roller 12 begins to stretch the filament bundle, the filament bundle receives tension, and the tension also acts on the metal spring 19, causing the metal spring 19 to deform to a certain extent until the bottom end of the metal spring 19 abuts against the end of the limit rod 22. When the filament bundle breaks, the force on the metal spring 19 disappears, and the metal spring 19 will deform and reset, thus reminding the staff that the filament bundle has broken. At the same time, when the metal spring 19 resets, it will pull the broken filament bundle in the opposite direction to prevent entanglement when it breaks.

[0111] VII: Heat exchanger 40

[0112] In this embodiment, in order to further improve the cooling effect on the high-temperature water flowing out of the heating box 28, the cooling component also includes a heat exchange box 40.

[0113] like Figure 10 As shown, a heat exchange box 40 is slidably installed in the fixed cover 35; the heat exchange box 40 is filled with a cooling medium that can cool the filter box 4.

[0114] like Figure 10 , Figure 12 As shown, the heat exchange box 40 is U-shaped; the outer side 44 of the heat exchange box 40 is fitted with the inner wall of the fixing cover 35, and does not obstruct the air outlet of the connecting pipe 37; the inner side 43 of the heat exchange box 40 is fitted with the outer surface of the filter box 4. During installation, the heat exchange box 40 slides into the fixing cover 35 through the vent 38, and is supported and fixed by the fixing cover 35, achieving a pull-out installation.

[0115] For example, the cooling medium is ice, thermally conductive silicone at low temperature, or other phase change material at low temperature.

[0116] Specifically, the heat exchange box 40 is provided with a medium tank 41 for filling the heat exchange medium; the outer end face of the heat exchange box 40 is provided with a handle 42, which is used to slide the heat exchange box 40 in the fixed cover 35 for installation or removal.

[0117] Specifically, such as Figure 10 , Figure 12 As shown, the upper surface of the heat exchange box 40 is lower than the heat-conducting fins 36 to avoid them blocking the air outlet of the connecting pipe 37.

[0118] The present invention cools the filter box 4 by means of the cooling medium in the heat exchange box 40, which can cool the high temperature water in a short time and make the water temperature in different areas above the water guide plate 2 have a large temperature difference, which is conducive to the reliable realization of the three-stage water bath of polylactic acid fiber.

[0119] Furthermore, an inspection port is provided on the side wall of the water bath 1 where the water pump is installed, which facilitates the maintenance and repair of the internal components.

[0120] Compared with the prior art, the technical solution provided in this embodiment has at least one of the following beneficial effects:

[0121] 1. The present invention is provided with an inclined water guide plate 2, so that the water flow can flow continuously downward along the water guide plate 2. The water guide plate 2 can be divided into three sections by two baffle plates 6. When the water flows downward through one baffle plate 6, it will be filtered through the filter box 4, which can separate the impurities in the water flow and prevent them from adhering to the filament bundle, thus ensuring the quality of the filament bundle.

[0122] 2. The present invention uses the heat-conducting fins 36 on the filter box 4 to cool the water flow. The water temperature decreases slightly each time it passes through a baffle plate 6. After entering the filter box 4, the water temperature is conducted to the filter box 4, and then the temperature of the filter box 4 is conducted to the air through the heat-conducting fins 36, thus cooling the water flow. This ensures that the temperature of the three water bath zones on the guide plate gradually decreases from top to bottom. Consequently, the water temperature is highest in the upper section of the guide plate 2, moderate in the middle section, and lowest in the bottom section, achieving a three-stage water bath and improving the water bath effect.

[0123] 3. The present invention is equipped with a broken wire detection component. When the wire bundle is stretched, it will compress the metal spring 19. When the wire bundle breaks, the metal spring 19 will reset to provide a reminder. At the same time, after resetting, the broken wire bundle can be pulled back to avoid the broken wire bundle from getting tangled with other normal wire bundles.

[0124] 4. The three-stage water bath in this invention can heat water using only one set of water pumps and heating wires, and the wire breakage detection is achieved through a physical structure, which greatly reduces equipment costs and operational difficulty, and is conducive to widespread use.

[0125] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A water bath drawing device for polylactic acid fibers used in tobacco processing, characterized in that, include: Water bath (1), water guide plate (2), filter box (4), guide roller assembly, circulating heating assembly, cooling assembly; The water bath (1) is inclined inside the water guide plate (2), and the internal space of the water bath (1) is divided into an upper part and a lower part by the water guide plate (2). The upper part is used for the silk bundle water bath, and the lower part is used for water medium circulation. The circulating heating assembly includes: a heating box (28), a water pipe, and a water pump; The heating box (28) is used to heat water; the water discharged from the heating box (28) flows from high to low along the upper surface of the water guide plate (2); the lower end of the water guide plate (2) is provided with a drain hole (5), which connects the upper half and the lower half of the water bath (1); The water guide pipe is located at the bottom of the water bath (1) and is used to recover the water after the fiber bundle water bath; the water pump can pump the water in the water guide pipe into the heating box (28) for water medium circulation. The guide roller assembly is used to draw polylactic acid fibers, and at the same time, the polylactic acid fibers are immersed in the water above the water guide plate (2) during the drawing process for a fiber bundle water bath. At least two filter boxes (4) are provided on the water guide plate (2), and the filter boxes (4) divide the water guide plate (2) into at least three sections; the filter boxes (4) are used to filter impurities in the water, and a cooling component is provided below the filter boxes (4) to cool the water flowing through the filter boxes (4). The cooling assembly includes: a fixed cover (35), a connecting pipe (37), and a mounting box (34); the fixed cover (35) covers the outside of the filter box (4), and its side is connected to the mounting box (34) through the connecting pipe (37); a rotatable axial fan blade is installed in the mounting box (34), and when the axial fan blade rotates, it can promote air to flow from the connecting pipe (37) into the fixed cover (35), thereby blowing air to cool the filter box (4).

2. The water bath drawing device for polylactic acid fibers used in tobacco as described in claim 1, characterized in that, The water guide plate (2) is provided with a through groove (3), and the filter box (4) is fixedly installed in the through groove (3) and located below the water guide plate (2); the filter box (4) is provided with a baffle plate (6) and a filter screen (7) inside; the baffle plate (6) is set perpendicular to the water guide plate (2), and its upper end protrudes from the upper surface of the water guide plate (2); the filter screen (7) is installed between the baffle plate (6) and the filter box (4), so that the baffle plate (6) and the filter screen (7) can divide the internal cavity of the filter box (4) into two parts, left and right; when the water flows through the filter screen (7), it can filter impurities.

3. The water bath drawing device for polylactic acid fibers for tobacco as described in claim 1 or 2, characterized in that, The two ends of the fixed cover (35) are fixedly connected to the inner wall surfaces on both sides of the water bath (1). The side of the water bath (1) is provided with ventilation holes (38), and one end of the fixed cover (35) is connected to the ventilation holes (38).

4. The water bath drawing device for polylactic acid fibers for tobacco as described in claim 3, characterized in that, A transmission box (31) is installed on the water guide pipe; a vertical rod (32) and blades (33) are installed in the transmission box (31); the lower end of the vertical rod (32) is rotatably connected to the transmission box (31), and the upper end is fixedly connected to the axial flow fan blades; the blades (33) are fixedly installed on the outside of the vertical rod (32), and multiple blades are arranged along the circumference of the vertical rod (32); when the water in the water guide pipe flows through the transmission box (31), it can drive the blades (33) to rotate; when the blades (33) rotate, they can drive the vertical rod (32) and the axial flow fan blades to rotate.

5. The water bath drawing device for polylactic acid fibers used in tobacco as described in claim 4, characterized in that, The filter box (4) is provided with multiple heat-conducting fins (36) for heat dissipation on its outer side.

6. The water bath drawing device for polylactic acid fibers used in tobacco as described in claim 4 or 5, characterized in that, The side of the water bath (1) is also provided with an air inlet (39); the bottom of the mounting box (34) is opened, or the mounting box (34) is connected to the air inlet (39) through an air inlet pipe.

7. The water bath drawing device for polylactic acid fibers for tobacco as described in any one of claims 2, 4-5, is characterized in that, The guide roller assembly includes: a rotating roller (9), a guide roller (11), a traction roller (12), a first pressure roller (13), a second pressure roller (14), and a third pressure roller (15); The guide roller (11) and the traction roller (12) are respectively disposed at both ends of the water bath (1), and the two have different rotation speeds, which are used to guide the polylactic acid fiber bundles and achieve stretching; The first pressing roller (13) and the second pressing roller (14) are respectively arranged above the water guide plate (2) to press the polylactic acid fiber bundle into the water above the water guide plate (2); Each of the water baffles (6) is rotatably mounted with a rotating roller (9) at its upper end; each of the rotating rollers (9) has two third pressing rollers (15) on both sides; the multiple third pressing rollers (15), the first pressing roller (13), and the second pressing roller (14) are located on the same straight line; the rotating roller (9) is positioned above the straight line formed by the connection of the first pressing roller (13) and the second pressing roller (14).

8. The water bath drawing device for polylactic acid fibers for tobacco as described in any one of claims 1-2 and 4-5, characterized in that, It also includes: a broken fiber detection component; the broken fiber detection component includes: a fixed frame (18), a metal spring (19), a guide pulley (21) and a limiting rod (22); the fixed frame (18) is in the shape of a "door" and is fixedly installed on the water bath (1); multiple metal springs (19) are arranged side by side on the crossbeam of the fixed frame (18); the end of the metal spring (19) is rotatably mounted with a guide pulley (21), one end of the limiting rod (22) is fixedly connected to the crossbeam of the fixed frame (18), and the other end is located on one side of the metal spring (19); the polylactic acid fiber bundle passes around the guide pulley (21), and the pressure on the guide pulley (21) when the bundle is stretched can press the metal spring (19) against the end of the limiting rod (22) so that the two abut against each other.

9. The water bath drawing device for polylactic acid fibers for tobacco as described in claim 3, characterized in that, A heat exchange box (40) is slidably installed in the fixed cover (35); the heat exchange box (40) is filled with a cooling medium that can cool the filter box (4).

10. The water bath drawing device for polylactic acid fibers for tobacco as described in claim 9, characterized in that, The heat exchange box (40) is U-shaped; the outer side (44) of the heat exchange box (40) is in contact with the inner wall of the fixed cover (35) and does not block the air outlet of the connecting pipe (37); the inner side (43) of the heat exchange box (40) is in contact with the outer surface of the filter box (4).

Images