High-strength para-aramid fiber production device and production process

Abstract

The invention relates to the technical field of para-aramid fiber production, in particular to a high-strength para-aramid fiber production device and process. A high-strength para-aramid fiber production device comprises a rack, a U-shaped yarn guide frame with a forward opening is arranged at the front end of the rack, a sealing cover is arranged at the top end of the rack in an up-down rotating mode, the yarn guide frame and the sealing cover can define a closed drafting cavity, the yarn guide frame comprises a rear plate connected with the rack, and side plates are arranged on the left side and the right side of the rear plate respectively. A comb-shaped yarn guiding opening is formed in the upper end face of the side plate, a hot tension roller set is arranged in the drafting cavity, a second motor for driving the hot tension roller set to rotate is arranged at the rear end of the rack, and a heating plate is arranged on the sealing cover. The high-strength para-aramid fiber production device is convenient to operate, good in heating stability and good in drafting effect, and the high-strength para-aramid fiber is finally obtained in cooperation with the para-aramid fiber production technology of two times of drafting.

Description

Technical Field

[0001] This invention relates to the field of para-aramid production technology, and in particular to a high-strength para-aramid production apparatus and process. Background Technology

[0002] Para-aramid fiber (abbreviated as para-aramid) is an aromatic polyamide fiber prepared by low-temperature solution polycondensation of p-phenylenediamine and terephthaloyl chloride. Its chemical name is poly(p-phenylene terephthalamide) (PPTA). It possesses high strength (6 times that of steel wire in tensile strength), high modulus (2-3 times that of steel wire), and high temperature resistance (does not decompose at 560℃). The fiber's molecular chain has a rod-like crystalline structure and is manufactured using a dry-jet wet spinning process. It is widely used in bulletproof materials, aerospace structural components, and optical cable reinforcement.

[0003] In the existing technology, the general production process of para-aramid is: spinning - acid washing - alkali washing - water washing - drying - drawing - oiling - winding. Among them, drawing can improve the strength of para-aramid fibers. During the drawing process, the fiber is stretched step by step at high temperature, which promotes the molecular chains to be arranged in a highly ordered manner along the fiber axis, forming a straight-chain crystalline structure. This structure can significantly improve the fiber strength and modulus. A drafting machine is required for drafting. Patent application CN201811313573.4 discloses a drafting machine, including a frame with a drafting box fixedly mounted on it. A motor housing is located on one side of the upper end of the drafting roller, with an opening at the top. A lifting device is located inside the motor housing, comprising a servo motor, a lifting rod, a threaded rod, and a limiting block. The lifting rod is symmetrically arranged at the bottom of the motor housing. The output shaft of the servo motor is fixedly connected to one end of the threaded rod. The other end of the threaded rod is threaded through the bottom surface of the motor housing to the outside of the motor housing and rotatably connected to the outer ring of a bearing. The inner ring of the bearing is fixedly sleeved on the drafting roller. By setting up the lifting device, the straight rod slides on the inner wall of the sleeve via a piston, causing the servo motor to move upward, which in turn moves the threaded rod upward, lifting the connecting plate upward. This changes the gap between the first and second sets of drafting devices, allowing fibers to pass between the upper and lower rows of heating rollers. The above technical solution has the following problems: 1. Since the fiber is mainly heated by the upper and lower heating rollers during drafting, the gap between the upper and lower heating rollers should be as small as possible in order to reduce the heating blank area. Therefore, a complex lifting device is required to control the distance, which is inconvenient to operate. 2. During the drawing process, the fiber is in an open space. The fiber temperature between the two heating rollers will be lower than that of the fiber in contact with the heating rollers, resulting in uneven overall fiber temperature and affecting the final strength of the fiber. 3. Fiber strands are prone to become tangled during fiber drawing, affecting the drawing effect and fiber strength; 4. The heating rollers at the infeed and outfeed ends are not equipped with corresponding pressure rollers, which cannot ensure that the fiber has sufficient and regular contact with the heating rollers at the infeed and outfeed ends, affecting the heating and stretching quality.

[0004] In summary, there is an urgent need to provide a production device and process that is easy to operate, has good heating stability, good stretching effect, and can obtain high-strength para-aramid fibers. Summary of the Invention

[0005] To solve at least one of the above-mentioned technical problems, the present invention provides a high-strength para-aramid fiber production apparatus, including a frame, a U-shaped guide frame with an opening facing forward at the front end of the frame, and a sealing cover that rotates up and down at the top end. The guide frame and the sealing cover can form a closed drawing cavity. The guide frame includes a rear plate connected to the frame, and side plates are respectively provided on the left and right sides of the rear plate. The upper end face of the side plate is provided with a comb-shaped guide opening. A thermal tension roller assembly is provided in the drawing cavity. A second motor for driving the thermal tension roller assembly to rotate is provided at the rear end of the frame. A heating plate is provided on the sealing cover.

[0006] Preferably, the frame includes a base and a rectangular upright plate. The top of the upright plate is provided with a groove, and the front end is provided with a roller hole that rotates with the roller shaft of the thermal tension roller assembly. The sealing cover includes a top plate, a bottom plate, and a front plate. The rear end of the top plate is provided with a rotating shaft that extends into the groove and is pivotally connected to the groove. The joints of the bottom plate and the two side plates are arc-shaped surfaces centered on the axis of the rotating shaft.

[0007] Preferably, the thermal tension roller assembly includes at least two upper rollers equidistant from left to right and at least one lower roller located below the upper rollers. The upper and lower rollers are staggered, and the aligned aramid filament bundles travel vertically between the upper and lower rollers. The second motor is provided in multiple units, each connected to an upper roller and a lower roller individually.

[0008] Preferably, the frame is provided with a first motor to drive the sealing cover to rotate, and the heating plate is provided in multiple ways, including a mounting bracket provided on the lower end face of the top plate and an electric heating plate provided on the lower end face of the mounting bracket. The electric heating plate is vertically arranged directly above the lower roller and extends along the length direction of the upper roller and the lower roller.

[0009] Preferably, the inner end face of the top plate is provided with a pressure roller groove, and two pressure rollers are rotatably arranged in the pressure roller groove. The two pressure rollers cooperate with two upper rollers near the guide wire opening to press the wire. The rear end of the pressure roller groove is provided with a roller shaft hole corresponding to the roller shaft of the pressure roller. The frame is provided with a drive hole corresponding to the roller shaft hole. A drive shaft is rotatably arranged in the drive hole. The pressure roller is connected to the drive shaft through a plug-in connection mechanism. The drive shaft is connected to the upper roller shaft that cooperates with the pressure roller through a transmission mechanism.

[0010] Preferably, the connecting mechanism includes a conical connector coaxially disposed at the free end of the pressure roller shaft and a connector shaft rotatably disposed in the drive hole. The connector has a cross-section that can be circumferentially positioned. The connector shaft can move back and forth and has a connector groove at its front end that matches the shape of the connector. The rear end is coaxially provided with a spline shaft and a spline sleeve that mates with the spline shaft. The rear end of the spline sleeve is connected to the drive shaft and has a spring inside that is connected to the spline shaft.

[0011] Preferably, the transmission mechanism includes a transmission box located at the rear end of the frame, a second motor connected to the upper roller shaft is provided at the rear end of the transmission box, and a pressure roller gear connected to the drive shaft and an upper roller gear connected to the upper roller are provided inside the transmission box, wherein the pressure roller gear meshes with the upper roller gear.

[0012] Preferably, the rear end face of the top plate is provided with a sliding groove, and a locking mechanism is provided in the sliding groove. The locking mechanism includes two sliders that are symmetrically arranged on the left and right and can slide and abut against each other under control. A semi-circular hole is provided at the abutment of the two sliders, and a damping layer is provided on the inner wall of the semi-circular hole. When the two sliders abut against each other, the damping layer holds the pressure roller shaft tightly.

[0013] Preferably, the two sliders are provided with magnetic attraction at their contact points, the rear end face of the sliders is provided with an extrusion groove, the extrusion groove is provided with an inclined surface, the frame is provided with a spherical extrusion head, the extrusion head can slide along the inclined surface and insert into the extrusion groove, pushing the two sliders away from the pressure roller shaft; the sliders include a rectangular docking block, one side of the docking block is provided with a "T" shaped block, the groove includes a main groove that slides with the docking block, and the left and right sides of the rectangular groove are provided with side grooves that slide with the "T" shaped block.

[0014] This invention provides a production process for high-strength para-aramid fibers, comprising the following steps: Step S1: Obtain nascent fibers by dry-jet wet spinning of para-aramid spinning solution; obtain para-aramid filament bundles by acid washing, alkali washing, water washing, and drying of nascent fibers. Step S2: Introduce the para-aramid filament bundle into the high-strength para-aramid production device for the first drawing; rotate the sealing cover of the high-strength para-aramid production device upward to open the drawing chamber, and split the para-aramid filament bundle at the guide port on the inlet side of the guide frame, then introduce it into the hot tension roller group for winding, and finally lead it out from the guide port on the outlet side of the guide frame; after the winding is completed, rotate the sealing cover downward to form a closed drawing chamber, turn on the heating, and make the hot tension roller group and heating plate reach the target temperature; finally, drive the hot tension roller group to rotate through the second motor to draw the para-aramid filament bundle. Step S3: Apply oil to the aligned aramid filament bundles after the first drawing is completed; Step S4: After the oiling is completed, the para-aramid filament bundle is introduced into the high-strength para-aramid production device for a second drawing. After the second drawing is completed, it is wound up to obtain high-strength para-aramid.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: 1. The present invention separates the para-aramid filament bundles by using the guide holes on the upper surface of the two side plates of the guide frame, which can avoid the filament tangling phenomenon during the drawing process and improve the drawing effect and the strength of the para-aramid. 2. The guide frame and sealing cover can form a closed drawing chamber, which can prevent heat loss and improve the drawing effect. At the same time, a heating plate is set on the sealing cover, which can increase the overall temperature in the drawing chamber and make the para-aramid filament bundle evenly heated. This can not only ensure the uniformity of the overall temperature of the para-aramid filament bundle, improve the thermal drawing effect and the strength of para-aramid, but also increase the spacing between the upper and lower tension rollers without affecting the heating effect, which facilitates the winding operation and improves the work efficiency. 3. The sealing cover can rotate up and down. When it is necessary to wrap around the roller, rotate the sealing cover upward and away from the guide frame. The "U"-shaped guide frame with the opening facing forward has a large operating space and less obstruction, which can further improve work efficiency. 4. The heating plate is vertically positioned directly above the lower roller and extends along the length of the upper and lower rollers. It can heat the aligned aramid filament bundle between the upper and lower rollers, quickly compensate for the heat loss of the aligned aramid filament bundle after it separates from the upper and lower rollers, and improve the heating efficiency. 5. By adjusting the distance between the upper and lower rollers, the para-aramid filament bundle can travel vertically between the upper and lower rollers, reducing the force generated during drawing and improving the drawing effect and the final strength of the para-aramid. 6. The pressure rollers ensure that the aligned aramid filament bundles do not detach from the upper roller near the feed end or the upper roller near the output end when entering or leaving the drawing chamber, thus ensuring the stability of the feed and output. 7. The pressure roller is connected to the drive shaft through a plug-in connection mechanism. The drive shaft is connected to the upper roller shaft that cooperates with the pressure roller through a transmission mechanism. This can reduce the number of motors used, while ensuring that the pressure roller and the upper roller that cooperates with it rotate synchronously at the same speed. 8. The connector, connector shaft, connector slot, spline shaft, spline sleeve and spring of the connecting mechanism cooperate with each other to achieve flexible connection and reduce connection wear; 9. The locking mechanism can hold the pressure roller shaft when the sealing cover rotates upward, preventing the pressure roller from rotating on its own and improving the insertion stability between the plug on the pressure roller and the plug groove on the plug shaft; the two sliders can slide relative to each other under control. When the two sliders abut, the two semi-circular holes form a circle that can hold the pressure roller shaft. The damping layer inside the semi-circular holes can increase the holding stability and prevent the pressure roller from slipping. 10. By cooperating with the extrusion head on the frame and the extrusion groove on the slider, the two sliders can be pushed to overcome the magnetic attraction and move away from each other, so that the pressure roller shaft can enter a free rotation state. 11. The present invention adopts a process of spinning-acid washing-alkali washing-water washing-drying-drawing-oiling-drawing-winding, which further improves the strength of para-aramid by two drawing processes, and finally obtains high-strength para-aramid fiber. In summary, the high-strength para-aramid production device of this invention is easy to operate, has good heating stability, and good stretching effect. In addition, the para-aramid production process with two stretching steps can ultimately produce high-strength para-aramid. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a top view of the present invention; Figure 3 for Figure 2 AA section view; Figure 4 This is a schematic diagram of the frame structure; Figure 5 This is a schematic diagram of the wire guide frame. Figure 6 This is a schematic diagram of the sealing cover. Figure 7 This is a schematic diagram of the structure of the thermal tension roller assembly; Figure 8 This is a schematic diagram of the heating plate structure; Figure 9 This is a schematic diagram of the connecting mechanism; Figure 10 This is a schematic diagram of the transmission mechanism; Figure 11 This is a schematic diagram of the locking mechanism; Figure 12 This is a schematic diagram of the locking mechanism in the unlocked state.

[0017] Explanation of reference numerals in the attached figures 1. Frame; 101. Base; 102. Vertical plate; 103. Groove; 104. First shaft hole; 105. Drive hole; 106. Extrusion head; 2. Wire guide frame; 201. Side plate; 202. Rear plate; 203. Wire guide opening; 3. Sealing cover; 301. Top plate; 302. Bottom plate; 303. Front plate; 304. Rotating shaft; 305. Pressure roller groove; 306. Second shaft hole; 307. Slide groove; 4. First motor; 5. Drawing chamber; 6. Thermal tension roller group; 601. Upper roller; 602. Lower roller; 7. Second motor; 8. Heating plate. 801. Mounting bracket; 802. Heating plate; 9. Pressure roller; 10. Connecting mechanism; 1001. Plug-in connector; 1002. Plug-in shaft; 1003. Plug-in groove; 1004. Splined shaft; 1005. Splined sleeve; 1006. Spring; 11. Drive shaft; 12. Transmission mechanism; 1201. Transmission box; 1202. Pressure roller gear; 1203. Upper roller gear; 13. Locking mechanism; 1301. Slider; 1302. Magnetic suction element; 1303. Semicircular hole; 1304. Damping layer; 1305. Extrusion groove; 1306. Inclined surface. Detailed Implementation

[0018] The specific embodiments of the present invention are described below with reference to the accompanying drawings and examples: It should be noted that the structures, proportions, sizes, etc. shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should fall within the scope of the technical content disclosed in the present invention.

[0019] Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention. Example 1

[0020] Combined with appendix Figure 1-12 This embodiment provides a high-strength para-aramid fiber production device, including a frame 1. The front end of the frame 1 is provided with a U-shaped guide frame 2 with an opening facing forward, and a sealing cover 3 is provided at the top end that rotates up and down. The guide frame 2 and the sealing cover 3 can form a closed drawing cavity 5. The guide frame 2 includes a rear plate 202 connected to the frame 1. The left and right sides of the rear plate 202 are respectively provided with side plates 201. The upper end surface of the side plate 201 is provided with a comb-shaped guide opening 203. The drawing cavity 5 is provided with a thermal tension roller group 6. The rear end of the frame 1 is provided with a second motor 7 that drives the thermal tension roller group 6 to rotate. The sealing cover 3 is provided with a heating plate 8.

[0021] In the above technical solution, the forward-opening "U"-shaped guide frame 2 refers to the "U"-shaped opening of the guide frame 2 being at the front end, that is, the front end corresponding to the rear plate 202 is in an open state; the sealing cover 3 can rotate under the drive of the first motor 4, sealing the openings at both ends and the front end of the guide frame 2, thereby forming a closed drawing cavity 5, which facilitates the heating of the aligned aramid filament bundles in the drawing cavity 5; the hot tension roller group 6 refers to multiple tension rollers with heating function, preferably electric heating rollers. The hot tension roller group 6 can adopt the conventional setting in the prior art, usually several hot tension rollers are arranged in two staggered rows; in use, towards The upper rotating sealing cover 3 opens the drawing chamber 5, and the aligned aramid fiber bundle is split into fibers at the guide port 203 on the inlet side of the guide frame 2. Then, it is introduced into the hot tension roller group 6 for winding. Finally, it is led out from the guide port 203 on the outlet side of the guide frame 2 to the next process. After the winding is completed, the sealing cover 3 is rotated downward to form a closed drawing chamber 5. Heating is turned on so that the hot tension roller group 6 and the heating plate 8 reach the target temperature. Finally, the hot tension roller group 6 is driven to rotate by the second motor 7. There is a speed difference between the tension rollers in the hot tension roller group 6, which forms a drawing force. Under the action of the drawing force, the aramid fiber bundle is oriented and elongated, and its strength is increased.

[0022] In this embodiment, the para-aramid filament bundles are separated by the guide ports 203 on the upper surfaces of the two side plates 201 of the guide frame 2, which can prevent the para-aramid filament bundles from becoming tangled during the drawing process, improve the drawing effect, and ultimately improve the strength of the para-aramid. The guide frame 2 and the sealing cover 3 can form a closed drawing cavity 5, which can prevent heat loss and improve the drawing effect. At the same time, a heating plate 8 is set on the sealing cover 3, which can increase the overall temperature in the drawing cavity 5, so that the para-aramid filament bundles between adjacent tension rollers are heated evenly. This can not only ensure the uniformity of the overall temperature of the para-aramid filament bundles, improve the thermal drawing effect and the strength of the para-aramid, but also increase the spacing between the upper and lower tension rollers without affecting the heating effect, which facilitates the winding operation and improves the working efficiency. The sealing cover 3 can rotate up and down. When it is necessary to wind the roller, the sealing cover 3 is rotated upward and away from the guide frame 2. The forward-facing "U"-shaped guide frame 2 has a large operating space and less obstruction, which can improve the winding efficiency.

[0023] In one specific technical solution, the frame 1 includes a base 101 and a rectangular upright plate 102. The top of the upright plate 102 is provided with a groove 103, and the front end is provided with a first shaft hole 104 that rotatably engages with the roller shaft of the thermal tension roller group 6. The sealing cover 3 includes a top plate 301, a bottom plate 302, and a front plate 303. The rear end of the top plate 301 is provided with a rotating shaft 304 that extends into the groove 103 and is pivotally connected to the groove 103. The joints of the bottom plate 302 and the two side plates 201 are all arc-shaped surfaces with the axis of the rotating shaft 304 as the center.

[0024] In the above technical solution, a groove 103 is provided on the top of the upright plate 102, which can increase the rotation angle of the sealing cover 3. The sealing cover 3 can rotate 180 degrees directly from the front end of the frame 1 with the rotation axis 304 as the axis, so that the sealing cover 3 completely leaves the front end of the frame 1, further increasing the operating space when winding the roller and improving the operating tolerance. The bottom plate 302 and the two side plates 201 are designed with an arc shape, which can reduce the overall volume of the equipment without interfering with the rotation of the sealing cover 3.

[0025] In one specific technical solution, the thermal tension roller group 6 includes at least two upper rollers 601 arranged equidistantly from left to right and at least one lower roller 602 located below the upper rollers 601. The upper rollers 601 and the lower rollers 602 are arranged alternately, and the aramid filament bundles travel vertically between the upper rollers 601 and the lower rollers 602. The second motor 7 is provided in multiple units, and is individually connected to the upper rollers 601 and the lower rollers 602 respectively.

[0026] In the above technical solution, by adjusting the distance between the upper roller 601 and the lower roller 602, the aramid filament bundle can travel vertically between the upper roller 601 and the lower roller 602, reducing the force component generated during drawing and improving the drawing effect and the strength of the aramid filament. The number of motors 7 is determined by the total number of upper rollers 601 and lower rollers 602, and each upper roller 601 and lower roller 602 is connected to a motor 7. In use, along the direction of travel of the aramid filament bundle, the rotational speed between adjacent upper rollers 601 and lower rollers 602 increases, generating a drawing force on the aramid filament bundle. The speed difference between adjacent upper rollers 601 and lower rollers 602 can be equal, at which time the aramid filament bundle in the drawing chamber 5 is drawn with a constant tension. The speed difference between adjacent upper rollers 601 and lower rollers 602 can also increase, at which time the aramid filament bundle in the drawing chamber 5 is drawn with an increasing tension. The drawing mode can be selected according to actual needs.

[0027] In one specific technical solution, the frame 1 is provided with a first motor 4 that drives the sealing cover 3 to rotate, and the heating plate 8 is provided with multiple heating plates, including a mounting bracket 801 located on the lower end face of the top plate 301 and an electric heating plate 802 located on the lower end face of the mounting bracket 801. The electric heating plate 802 is vertically located directly above the lower roller 602 and extends along the length direction of the upper roller 601 and the lower roller 602.

[0028] In the above technical solution, the heating plate 802 is vertically arranged directly above the lower roller 602 and extends along the length of the upper roller 601 and the lower roller 602. It can heat the aligned aramid filament bundle between the upper roller 601 and the lower roller 602, quickly make up for the heat loss of the aligned aramid filament bundle after it is separated from the upper roller 601 and the lower roller 602, and improve the heating efficiency.

[0029] In one specific technical solution, the inner end face of the top plate 301 is provided with a pressure roller groove 305, and two pressure rollers 9 are rotatably arranged in the pressure roller groove 305. The two pressure rollers 9 cooperate with two upper rollers 601 near the guide wire opening 203 to press the wire. The rear end of the pressure roller groove 305 is provided with a second shaft hole 306 corresponding to the roller shaft of the pressure roller 9. The frame 1 is provided with a drive hole 105 corresponding to the second shaft hole 306. A drive shaft 11 is rotatably arranged in the drive hole 105. The pressure roller 9 is connected to the drive shaft 11 through a plug-in connection mechanism 10. The drive shaft 11 is connected to the roller shaft of the upper roller 601 that cooperates with the pressure roller 9 through a transmission mechanism 12.

[0030] In the above technical solution, the pressure roller 9 ensures that when the aligned aramid filament bundle enters or leaves the drawing chamber 5, it does not detach from the upper roller 601 near the infeed end or the upper roller 601 near the outlet end, thus ensuring the stability of the infeed and outlet. The plug-in connection mechanism 10 refers to the connection mechanism 10 being divided into two pluggable parts, one part being connected to the roller shaft of the pressure roller 9 and the other part being connected to the drive shaft 11. When the pressure roller 9 rotates upward with the sealing cover 3, the part of the connection mechanism 10 connected to the pressure roller 9 and the part connected to the drive shaft 11 disengage. When the pressure roller 9 rotates downward with the sealing cover 3, the pressure roller 9 disengages from the other part of the connection mechanism 10. The part of the connecting mechanism 10 connected to the pressure roller 9 and the part connected to the drive shaft 11 are plugged together to achieve dynamic connection between the pressure roller 9 and the drive shaft 11. The plug-in connecting mechanism 10 can adopt any suitable plug-in structure in the prior art, as long as it can ensure that the pressure roller 9 rotates with the drive shaft 11. The drive shaft 11 is connected to the upper roller 601 that cooperates with the pressure roller 9 through the transmission mechanism 12, which can reduce the number of motors used, while ensuring that the pressure roller 9 and the upper roller 601 that cooperates with it rotate synchronously. The transmission mechanism 12 can adopt any suitable gear meshing structure or sprocket chain meshing structure.

[0031] In one specific technical solution, the connecting mechanism 10 includes a conical plug 1001 coaxially disposed at the free end of the roller shaft of the pressure roller 9 and a plug shaft 1002 rotatably disposed in the drive hole 105. The plug 1001 is provided with a cross-section that can be circumferentially positioned. The plug shaft 1002 can move back and forth, and its front end is provided with a plug groove 1003 that is consistent with the shape of the plug 1001. The rear end is coaxially provided with a spline shaft 1004 and a spline sleeve 1005 that cooperates with the spline shaft 1004. The rear end of the spline sleeve 1005 is connected to the drive shaft 11, and a spring 1006 connected to the spline shaft 1004 is provided inside.

[0032] In the above technical solution, the connector 1001, connector shaft 1002, connector groove 1003, spline shaft 1004, spline sleeve 1005, and spring 1006 of the connecting mechanism 10 cooperate with each other to achieve flexible insertion and reduce insertion wear. The conical connector 1001 of the connecting mechanism 10 can prevent scratching of the connector shaft 1002 and connector groove 1003 during insertion. The cut surface on the connector 1001 can achieve circumferential positioning, so that the connector 1001 is circumferentially locked when inserted into the connector groove 1003, ensuring that the connector 1001 is securely connected. 01 can rotate with the plug shaft 1002. The rear end of the plug shaft 1002 is provided with a spline shaft 1004 and a spline sleeve 1005 that mates with the spline shaft 1004. During the process of the plug 1001 being inserted into or removed from the plug groove 1003, the plug shaft 1002 and the spline shaft 1004 will be pushed to move backward. The spring 1006 inside the spline sleeve 1005 will be compressed. When the plug 1001 is fully inserted into or removed from the plug groove 1003, the plug shaft 1002 and the spline shaft 1004 will be reset under the push of the spring 1006.

[0033] In one specific technical solution, the transmission mechanism 12 includes a transmission box 1201 located at the rear end of the frame 1. The rear end of the transmission box 1201 is provided with a second motor 7 connected to the roller shaft of the upper roller 601. Inside the transmission box 1201 are a pressure roller gear 1202 connected to the drive shaft 11 and an upper roller gear 1203 connected to the upper roller 601. The pressure roller gear 1202 meshes with the upper roller gear 1203.

[0034] In the above technical solution, as mentioned above, the upper roller 601 connected to the second motor 7 is the upper roller 601 that cooperates with the pressure roller 9. In order to ensure that the speed of the pressure roller 9 and the upper roller 601 that cooperates with it is the same, the number of teeth of the pressure roller gear 1202 and the upper roller gear 1203 must be the same. This is common knowledge and will not be elaborated further.

[0035] In one specific technical solution, the rear end face of the top plate 301 is provided with a sliding groove 307, and a locking mechanism 13 is provided in the sliding groove 307. The locking mechanism 13 includes two sliders 1301 that are symmetrically arranged on the left and right and can slide and abut against each other under control. A semi-circular hole 1303 is provided at the abutment of the two sliders 1301. A damping layer 1304 is provided on the inner wall of the semi-circular hole 1303. When the two sliders 1301 abut against each other, the damping layer 1304 holds the roller shaft of the pressure roller 9 tightly.

[0036] In the above technical solution, the locking mechanism 13 can hold the roller shaft of the pressure roller 9 when the sealing cover 3 rotates upward, preventing the pressure roller 9 from rotating and improving the insertion stability between the plug 1001 on the pressure roller 9 and the plug groove 1003 on the plug shaft 1002; the two sliders 1301 can slide and abut against each other under control. Conventional displacement driving components such as cylinders and hydraulic cylinders can be used to control the sliding of the sliders 1301. When the two sliders 1301 abut against each other, the two semi-circular holes 1303 form a circle that can hold the roller shaft of the pressure roller 9. The damping layer 1304 in the semi-circular hole 1303 can increase the holding stability and prevent the pressure roller 9 from slipping.

[0037] In one specific technical solution, the abutment of the two sliders 1301 is provided with magnetic suction element 1302, the rear end face of the slider 1301 is provided with extrusion groove 1305, the extrusion groove 1305 is provided with inclined surface 1306, the frame 1 is provided with spherical extrusion head 106, the extrusion head 106 can slide along the inclined surface 1306 and insert into the extrusion groove 1305, pushing the two sliders 1301 away from the roller shaft of pressure roller 9; the slider 1301 includes a rectangular docking block, one side of the docking block is provided with a "T" shaped block, the slide groove 307 includes a main slide groove that slides with the docking block, and the left and right sides of the rectangular groove are provided with side slide grooves that slide with the "T" shaped block.

[0038] In the above technical solution, the size of the extrusion groove 1305 is determined by the size of the extrusion head 106. It is necessary to ensure that the extrusion head 106 can be inserted into the extrusion groove 1305 when the extrusion groove 1305 rotates downward with the sealing cover 3 to the closed state. The extrusion head 106 can be a complete spherical head or a hemispherical head, as long as the insertion surface of the extrusion head 106 is spherical. When the extrusion groove 1305 rotates downward with the sealing cover 3, the extrusion head 106 abuts against the inclined surface 1306 in the extrusion groove 1305. As the sealing cover 3 moves closer, the extrusion head 106 slides along the inclined surface 1306 and inserts into the depth of the extrusion groove 1305, pushing the two sliders 1301 to overcome the magnetic attraction and move away from each other. During this process, the plug 1001 on the roller shaft of the pressure roller 9 is inserted into the plug groove 1003. When the plug 1001 is fully inserted into the plug groove 1003, the roller shaft of the pressure roller 9 also enters a free rotation state.

[0039] The working principle and process of this embodiment are as follows: The first motor 4 drives the rotating shaft 304 of the sealing cover 3 to rotate, causing the sealing cover 3 to rotate upward and open the drawing cavity 5 formed by the sealing cover 3 and the guide wire frame 2. During the upward rotation of the sealing cover 3, the plug 1001 of the connecting mechanism 10 on the roller shaft of the pressure roller 9 disengages from the plug shaft 1002 of the connecting mechanism 10 on the drive shaft 11. At the same time, the two sliders 1301 on the locking mechanism 13 disengage from the extrusion head 106 on the frame 1, and the locking mechanism... The two sliders 1301 of structure 13 approach each other under the action of magnetic attraction and hug the roller shaft of pressure roller 9, locking pressure roller 9; the aligned aramid filament bundle is split at the guide port 203 on the inlet side of the guide frame 2, and then introduced into the thermal tension roller group 6 for winding. The aramid filament bundle travels vertically between the upper roller 601 and the lower roller 602, and finally is led out from the guide port 203 on the outlet side of the guide frame 2 to the next process; after the winding is completed, the sealing cover 3 is rotated downward so that the sealing cover 3 and the guide frame 2 form a closed drawing cavity 5. During the downward rotation of roller 9, the connector 1001 of the connecting mechanism 10 on the roller shaft of roller 9 is inserted into the connector shaft 1002 of the connecting mechanism 10 on the drive shaft 11. At the same time, the two sliders 1301 on the locking mechanism 13 approach the two extrusion heads 106 on the frame 1. The two extrusion heads 106 are inserted into the extrusion grooves 1305 of the two sliders 1301, pushing the two sliders to overcome the magnetic attraction and move away from each other, thus unlocking roller 9; heating is turned on, so that the thermal tension roller group 6 and the heating plate 8 reach the target temperature. Roller 601 and lower roller 602 heat the aramid filament bundle wound on them, and heating plate 802 heats the aramid filament bundle between upper roller 601 and lower roller 602. After reaching the target temperature, the second motor 7 is started to increase the rotational speed between adjacent upper roller 601 and lower roller 602 to stretch the aramid filament bundle. The two upper rollers 601 near the infeed end and the filament outlet end drive the two corresponding pressure rollers 9 to rotate synchronously and at the same speed through the transmission mechanism 12 to press the aramid filament bundle at the infeed end and the filament outlet end. Example 2

[0040] Combined with appendix Figure 1-12 This embodiment provides a production process for high-strength para-aramid using the high-strength para-aramid production apparatus described in Embodiment 1, including the following steps: Step S1: Obtain nascent fibers by dry-jet wet spinning of para-aramid spinning solution; obtain para-aramid filament bundles by acid washing, alkali washing, water washing, and drying of nascent fibers. Step S2: Introduce the para-aramid filament bundle into the high-strength para-aramid production device for the first drawing; rotate the sealing cover 3 of the high-strength para-aramid production device upward to open the drawing chamber 5, and split the para-aramid filament bundle at the guide port 203 on the inlet side of the guide frame 2, then introduce it into the hot tension roller group 6 for winding, and finally lead it out from the guide port 203 on the outlet side of the guide frame 2; after the winding is completed, rotate the sealing cover 3 downward to form a closed drawing chamber 5, turn on the heating, and make the hot tension roller group 6 and the heating plate 8 reach the target temperature; finally, drive the hot tension roller group 6 to rotate through the second motor 7 to draw the para-aramid filament bundle. Step S3: Apply oil to the aligned aramid filament bundles after the first drawing is completed; Step S4: After the oiling is completed, the para-aramid filament bundle is introduced into the high-strength para-aramid production device for a second drawing. After the second drawing is completed, it is wound up to obtain high-strength para-aramid.

[0041] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A high-strength para-aramid fiber production apparatus, comprising a frame (1), characterized in that, The front end of the frame (1) is provided with a U-shaped wire guide frame (2) with an opening facing forward, and a sealing cover (3) is provided at the top end that rotates up and down. The wire guide frame (2) and the sealing cover (3) can form a closed drawing cavity (5). The wire guide frame (2) includes a back plate (202) connected to the frame (1). The back plate (202) is provided with side plates (201) on the left and right sides respectively. The upper end face of the side plate (201) is provided with a comb-shaped wire guide mouth (203). The drawing cavity (5) is provided with a thermal tension roller group (6). The rear end of the frame (1) is provided with a second motor (7) that drives the thermal tension roller group (6) to rotate. The sealing cover (3) is provided with a heating plate (8).

2. The high-strength para-aramid fiber production apparatus according to claim 1, characterized in that, The frame (1) includes a base (101) and a rectangular upright plate (102). The top of the upright plate (102) is provided with a groove (103), and the front end is provided with a first shaft hole (104) that rotates with the roller shaft of the thermal tension roller group (6). The sealing cover (3) includes a top plate (301), a bottom plate (302) and a front plate (303). The rear end of the top plate (301) is provided with a rotating shaft (304) that extends into the groove (103) and is pivotally connected to the groove (103). The joints of the bottom plate (302) and the two side plates (201) are all arc-shaped surfaces with the axis of the rotating shaft (304) as the center.

3. The high-strength para-aramid fiber production apparatus according to claim 2, characterized in that, The thermal tension roller group (6) includes at least two upper rollers (601) arranged equidistantly on the left and right and at least one lower roller (602) located below the upper rollers (601). The upper rollers (601) and the lower rollers (602) are arranged alternately. The aramid filament bundle moves vertically between the upper rollers (601) and the lower rollers (602). The second motor (7) is provided in multiple units and is connected to the upper rollers (601) and the lower rollers (602) separately.

4. The high-strength para-aramid fiber production apparatus according to claim 3, characterized in that, The frame (1) is provided with a first motor (4) that drives the sealing cover (3) to rotate. The heating plate (8) is provided with multiple heating plates, including a mounting bracket (801) located on the lower end face of the top plate (301) and an electric heating plate (802) located on the lower end face of the mounting bracket (801). The electric heating plate (802) is vertically located directly above the lower roller (602) and extends along the length direction of the upper roller (601) and the lower roller (602).

5. The high-strength para-aramid fiber production apparatus according to claim 4, characterized in that, The inner end face of the top plate (301) is provided with a pressure roller groove (305). Two pressure rollers (9) are rotatably arranged in the pressure roller groove (305). The two pressure rollers (9) cooperate with two upper rollers (601) near the guide wire opening (203) to press the wire. The rear end of the pressure roller groove (305) is provided with a second shaft hole (306) corresponding to the roller shaft of the pressure roller (9). The frame (1) is provided with a drive hole (105) corresponding to the second shaft hole (306). A drive shaft (11) is rotatably arranged in the drive hole (105). The pressure roller (9) is connected to the drive shaft (11) through a plug-in connection mechanism (10). The drive shaft (11) is connected to the roller shaft of the upper roller (601) that cooperates with the pressure roller (9) through a transmission mechanism (12).

6. The high-strength para-aramid fiber production apparatus according to claim 5, characterized in that, The connecting mechanism (10) includes a conical plug (1001) coaxially disposed at the free end of the roller shaft of the pressure roller (9) and a plug shaft (1002) rotatably disposed in the drive hole (105). The plug (1001) has a cross-section that can be circumferentially positioned. The plug shaft (1002) can move back and forth, and the front end has a plug groove (1003) that is consistent with the shape of the plug (1001). The rear end is coaxially provided with a spline shaft (1004) and a spline sleeve (1005) that cooperates with the spline shaft (1004). The rear end of the spline sleeve (1005) is connected to the drive shaft (11), and a spring (1006) connected to the spline shaft (1004) is provided inside.

7. A high-strength para-aramid fiber production apparatus according to claim 6, characterized in that, The transmission mechanism (12) includes a transmission box (1201) located at the rear end of the frame (1). The rear end of the transmission box (1201) is provided with a second motor (7) connected to the roller shaft of the upper roller (601). Inside the transmission box (1201) are a pressure roller gear (1202) connected to the drive shaft (11) and an upper roller gear (1203) connected to the upper roller (601). The pressure roller gear (1202) meshes with the upper roller gear (1203).

8. The high-strength para-aramid fiber production apparatus according to claim 7, characterized in that, The rear end face of the top plate (301) is provided with a sliding groove (307), and a locking mechanism (13) is provided in the sliding groove (307). The locking mechanism (13) includes two sliders (1301) arranged symmetrically on the left and right and able to slide and abut against each other under control. A semi-circular hole (1303) is provided at the abutment of the two sliders (1301). A damping layer (1304) is provided on the inner wall of the semi-circular hole (1303). When the two sliders (1301) abut against each other, the damping layer (1304) holds the roller shaft of the pressure roller (9).

9. A high-strength para-aramid fiber production apparatus according to claim 8, characterized in that, The two sliders (1301) are provided with magnetic suction (1302) at their contact points. The rear end face of the slider (1301) is provided with an extrusion groove (1305). The extrusion groove (1305) is provided with an inclined surface (1306). The frame (1) is provided with a spherical extrusion head (106). The extrusion head (106) can slide along the inclined surface (1306) into the extrusion groove (1305) to push the two sliders (1301) away from the roller shaft of the pressure roller (9). The slider (1301) includes a rectangular docking block. A "T"-shaped block is provided on one side of the docking block. The groove (307) includes a main groove that slides with the docking block. Side grooves that slide with the "T"-shaped block are provided on the left and right sides of the rectangular groove.

10. A production process for high-strength para-aramid fibers, characterized in that, Using the high-strength para-aramid production apparatus according to any one of claims 1-9, the process includes the following steps: Step S1: Obtain nascent fibers by dry-jet wet spinning of para-aramid spinning solution; obtain para-aramid filament bundles by acid washing, alkali washing, water washing, and drying of nascent fibers. Step S2: Introduce the para-aramid filament bundle into the high-strength para-aramid production device for the first drawing; rotate the sealing cover (3) of the high-strength para-aramid production device upward to open the drawing chamber (5), and split the para-aramid filament bundle at the guide port (203) on the inlet side of the guide frame (2), then introduce it into the hot tension roller group (6) for winding, and finally lead it out from the guide port (203) on the outlet side of the guide frame (2); after the winding is completed, rotate the sealing cover (3) downward to form a closed drawing chamber (5), turn on the heating, and make the hot tension roller group (6) and the heating plate (8) reach the target temperature; finally, drive the hot tension roller group (6) to rotate through the second motor (7) to draw the para-aramid filament bundle; Step S3: Apply oil to the aligned aramid filament bundles after the first drawing is completed; Step S4: After the oiling is completed, the para-aramid filament bundle is introduced into the high-strength para-aramid production device for a second drawing. After the second drawing is completed, it is wound up to obtain high-strength para-aramid.

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