A method for collecting polyacrylonitrile-based carbon fiber precursor

Abstract

The present invention relates to a method for collecting polyacrylonitrile-based carbon fiber precursor, comprising the following steps: passing the running tows from N spinning positions through a guide groove roller before being loaded onto a collection machine. The number of collection machines corresponds to the number of spinning positions and is one-to-one corresponding to each other. The N collection machines are arranged as follows: the N collection machines are arranged on the same horizontal plane; the collection machines are located downstream of the guide groove roller along the running direction of the tows; each collection machine is located in the running direction of the tows at its corresponding spinning position; and each collection machine is at a different distance from the guide groove roller. Multiple spinning positions are arranged in parallel. If the first spinning position on one side is farthest from the operating side and the Nth spinning position on the other side is closest to the operating side, then the distance between the collection machine and the guide groove roller decreases from the collection machine at the first spinning position to the collection machine at the Nth spinning position. The present invention ensures that the polyacrylonitrile-based carbon fiber precursor from multiple spinning positions can be smoothly loaded onto the collection machine, reducing the probability of roller entanglement.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon fibers, in particular to a method for collecting polyacrylonitrile-based carbon fiber precursors. Background Art

[0002] Carbon fiber, a material with excellent properties such as high strength, high modulus, low density, fatigue resistance, and high temperature resistance, is widely used in both military and civilian applications. Many domestic polyacrylonitrile carbon fiber companies have begun independent research and development, entering a challenging era of fierce market competition.

[0003] Polyacrylonitrile-based carbon fiber precursor, also known as polyacrylonitrile-based carbon fiber precursor fiber, is the raw material fiber for manufacturing polyacrylonitrile-based carbon fiber. Carbon fiber is produced by pre-oxidizing the polyacrylonitrile-based carbon fiber precursor, then carbonizing it at low temperature and high temperature.

[0004] During production, the resulting polyacrylonitrile-based carbon fiber precursor is collected (wound into shape) according to required lengths. Existing research on the winding problem focuses on improving the collection equipment. However, with multiple spinning positions, the filaments are prone to interference with each other, leading to limited research in this area. Summary of the Invention

[0005] In view of this, the present invention provides a method for collecting polyacrylonitrile-based carbon fiber precursor, the main purpose of which is to ensure that the polyacrylonitrile-based carbon fiber precursor from multiple spinning positions can be smoothly loaded onto the winding machine for winding, and to achieve fast and efficient roll changing, thereby reducing the probability of roller entanglement.

[0006] To achieve the above objectives, the present invention mainly provides the following technical solutions:

[0007] On the one hand, an embodiment of the present invention provides a method for collecting polyacrylonitrile-based carbon fiber precursor, comprising the following steps: passing the running tows of N spinning positions through a guide groove roller and then being mounted on a collection machine; wherein the number of collection machines is consistent with the number of spinning positions and corresponds one to one; wherein N is a positive integer greater than 1; wherein the N collection machines are arranged as follows:

[0008] N wire collecting machines are all arranged on the same horizontal plane; wherein, along the running direction of the yarn bundle, the wire collecting machine is located downstream of the wire guide groove roller; wherein, each wire collecting machine is located in the running direction of the yarn bundle at its corresponding spinning position; and, each wire collecting machine is at a different distance from the wire guide groove roller, and multiple spinning positions are arranged in parallel. If the first spinning position on one side is farthest from the operating side, and the Nth spinning position on the other side is closest to the operating side, then: starting from the wire collecting machine with the first spinning position to the wire collecting machine with the Nth spinning position, the distance between the wire collecting machine and the wire guide groove roller shows a decreasing trend (the term "operating side" refers to the side where the staff performs the winding and unwinding operations).

[0009] Preferably, a plurality of parallel wire paths are provided on the guide groove roller; wherein, when the running wire bundles of N spinning positions pass through the guide groove roller: the wire bundles of the same spinning position pass through the same wire path on the guide groove roller; and the wire bundles of different spinning positions pass through different wire paths on the guide groove roller.

[0010] Preferably, the position of the wire guide groove roller is 20-80 cm higher than the guide wheel on the wire collecting machine to prevent the running wire bundle from falling and getting mixed into the transmission part.

[0011] Preferably, the angle between the line connecting any two adjacent wire collecting machines and the running direction of the running wire bundle is θ; wherein θ is 2-5°; preferably, the diameter distance L between the two adjacent wire collecting machines is related to the distance d between the adjacent wire paths on the wire guide groove roller, specifically L=d / sinθ; further preferably, d is 3-8cm.

[0012] Preferably, if the distance between the Mth wire collector and the wire guide groove roller is greater than 2m and less than or equal to 5m: the running wire bundle corresponding to the spinning position of the Mth wire collector needs to pass through at least one support roller after passing through the wire guide groove roller, and then be put on the Mth wire collector; if the distance between the Mth wire collector and the wire guide groove roller is greater than 5m and less than 9m: the running wire bundle corresponding to the spinning position of the Mth wire collector needs to pass through at least two support rollers after passing through the wire guide groove roller, and then be put on the Mth wire collector.

[0013] Preferably, the support roller is 20-80 cm higher than the guide wheel on the wire collecting machine; preferably, the diameter of the support roller is 3-8 cm; preferably, the length of the support roller is set according to the following: the length of the support roller = the number of wire spinning positions × the distance between adjacent spinning positions + the coefficient x; wherein the coefficient x is 5-15 cm (the length of the support roller is related to the number of supported spinning positions, and the coefficient is to leave a certain margin); preferably, the material of the support roller is any one of stainless steel, ceramic-plated stainless steel, and chrome-plated stainless steel.

[0014] Preferably, a movable roller assembly is provided near each wire collecting machine; the movable roller assembly includes a movable roller; wherein the movable roller is used to lift the wire bundle during the operation of putting the wire on a shelf or replacing the wire winding roller to prevent the wire bundle from being entangled; preferably, the movable roller in the movable roller assembly can be moved, and during the operation of putting the wire on a shelf or replacing the wire winding roller, the movable roller is controlled to move to a set position to lift the running wire bundle, and after the operation of putting the wire on a shelf or replacing the roller is completed, the movable roller is retracted by moving.

[0015] Preferably, the moving roller assembly comprises:

[0016] longitudinal slide rails;

[0017] a transverse slide bar, one end of which is connected to the upper end of the longitudinal slide rail;

[0018] A movable roller structure, comprising a movable roller and a connecting rod; the upper end of the connecting rod is connected to the movable roller; the connecting rod is slidably connected to the transverse sliding rod;

[0019] a first driving mechanism connected to the longitudinal slide rail;

[0020] a second driving mechanism, the second driving mechanism being connected to the first driving mechanism and being used to drive the first driving mechanism to move up and down on the longitudinal slide rail;

[0021] The lower end of the connecting rod is sleeved on the driving shaft of the first driving mechanism, and the lower end of the connecting rod is engaged with the driving shaft through a thread; the driving shaft is arranged horizontally;

[0022] The movable roller is controlled to move longitudinally and transversely by controlling the first driving mechanism and the second driving mechanism;

[0023] Preferably, the first driving mechanism is a motor; the second driving mechanism is a driving cylinder.

[0024] Preferably, when collecting the polyacrylonitrile-based carbon fiber precursor, a wire suction gun device is used to suck the tow and pull it forward so that the running tow crosses the wire guide groove roller; wherein the wire suction gun device includes:

[0025] A support rod, wherein the upper end of the support rod is provided with a guide wire ring;

[0026] A wire suction gun, wherein the upper end of the wire suction gun is provided with a wire suction port, wherein the wire suction port is trumpet-shaped; wherein the wire suction gun is used to connect to an air source;

[0027] The running silk bundle is firstly passed through the wire guide ring of the support rod, and then sucked into the silk suction gun through the silk suction port;

[0028] Preferably, the height of the support rod is 800-1300 mm, and the diameter of the guide wire ring is 5-10 cm.

[0029] Preferably, when collecting the polyacrylonitrile-based carbon fiber precursor: use a wire suction gun device to suck the filament bundle and run it toward the wire collecting machine, the staff uses a wire guide rod to support the filament bundle behind it, bring the filament bundle above the wire guide groove roller, put the filament bundle into the wire path of the wire guide groove roller, and ensure that the filament bundles at the same spinning position are placed in the same wire path on the wire guide groove roller; the filament bundles at different spinning positions are placed in different wire paths on the wire guide groove roller, and observe at any time whether there is any possibility of backtangling, and continue to bring the filament until the loading is completed.

[0030] Preferably, the step of continuing to carry the wire until the wire is put on the shelf is completed includes:

[0031] For the spinning position where the distance between the wire collecting machine and the wire guide groove roller is less than or equal to 2m, the tow corresponding to the spinning position of the wire collecting machine is directly brought to the wire collecting machine for the racking operation; during the racking operation, the moving roller can be extended to allow the tow to pass through the moving roller to avoid falling or drooping during the racking operation; after the racking operation, the moving roller is retracted;

[0032] For the spinning position where the distance between the wire collecting machine and the wire guide groove roller is greater than 2m, the yarn bundle corresponding to the spinning position of the wire collecting machine shall be brought to the wire collecting machine for the shelving operation after passing through at least one supporting roller during the wire-carrying process; during the shelving operation, the movable roller may be extended to allow the yarn bundle to pass through the movable roller to avoid falling or drooping during the shelving operation; after the shelving operation, the movable roller shall be retracted.

[0033] Preferably, when replacing the winding roller, extend the movable roller, turn on the suction switch of the wire collecting machine, cut the wire bundle and put it into the suction switch for suction, then cut the running wire bundle from the suction switch of the wire collecting machine, suck it with a wire suction gun device, and then pull the running wire bundle onto the movable roller, raise the movable roller to support the wire bundle and prevent the wire bundle from being entangled; after replacing the new winding roller, lower the movable roller and use the wire suction gun device to bring the running wire bundle back into the upper shelf.

[0034] Compared with the prior art, the polyacrylonitrile-based carbon fiber precursor collection method of the present invention has at least the following beneficial effects:

[0035] An embodiment of the present invention provides a method for collecting polyacrylonitrile-based carbon fiber precursor. When collecting, the running yarn bundles of N spinning positions are first passed through the wire guide groove roller and then mounted on the wire collecting machine; the arrangement of the wire collecting machines is designed as follows: the N wire collecting machines are all arranged on the same horizontal plane; along the running direction of the yarn bundle, the wire collecting machine is located downstream of the wire guide groove roller; wherein, each wire collecting machine is located in the running direction of the yarn bundle corresponding to its spinning position; and, the distance between each wire collecting machine and the wire guide groove roller is different, and multiple spinning positions are arranged in parallel. If the first spinning position on one side is farthest from the operating side and the Nth spinning position on the other side is closest to the operating side, then: starting from the wire collecting machine with the first spinning position to the wire collecting machine with the Nth spinning position, the distance between the wire collecting machine and the wire guide groove roller shows a decreasing trend. The arrangement of the winders in this embodiment of the present invention prevents interference and entanglement between tows at different spinning positions during operation and loading, thereby ensuring smooth loading of polyacrylonitrile-based carbon fiber precursor from multiple spinning positions onto the winders and reducing the probability of roller entanglement and labor intensity. Furthermore, arranging all N winders on the same level facilitates tow stability.

[0036] Furthermore, an embodiment of the present invention provides a method for collecting polyacrylonitrile-based carbon fiber precursor, wherein multiple parallel yarn paths are provided on a godet roller. When the running yarn tows of N spinning positions pass through the godet roller, the yarn tows at the same spinning position pass through the same yarn path on the godet roller, while the yarn tows at different spinning positions pass through different yarn paths on the godet roller. By providing multiple parallel yarn paths on the godet roller, the running yarn tows at different spinning positions can be evenly separated, thereby preventing interference and entanglement of the yarn tows at different spinning positions during operation and loading.

[0037] Furthermore, an embodiment of the present invention provides a method for collecting polyacrylonitrile-based carbon fiber precursor. Since the distances between multiple collecting machines and the wire guide groove roller are different, the running yarn bundle corresponding to the spinning position of the collecting machine that is farther away from the wire guide groove roller may fall and be entangled in the transmission part during the process of running from the wire guide groove roller to the collecting machine due to the long running distance. At least one support roller is designed to support the yarn bundle to avoid the yarn bundle passing through the wire guide groove roller from falling during the process of running to the farther collecting machine (if it falls, it is easy to be entangled on other collecting machines), further ensuring that the polyacrylonitrile-based carbon fiber precursors of multiple spinning positions can be smoothly put on the collecting machine, and reducing the probability of roller entanglement and manual labor intensity.

[0038] Furthermore, the inventors of the present invention have also innovatively discovered that during the actual wire collection operation (bringing the tow to the guide roller of the wire collection machine, just when it is put on the rack) and the replacement of the wire winding roller (replacing the wire winding roller on the wire collection machine), due to the relaxation of the drafting force, the tow may fall and droop, and then become entangled with the roller; based on this problem, the inventors of the present invention have innovatively designed the following for the first time: a moving roller assembly is provided near each wire collection machine; the moving roller assembly includes a moving roller; wherein the moving roller is used to lift the tow during the operation of putting the tow on the rack or replacing the wire winding roller to prevent the tow from being entangled. The design of the moving roller can further reduce the probability of roller entanglement.

[0039] In summary, the present invention provides a method for collecting polyacrylonitrile-based carbon fiber precursor, suitable for collecting and loading carbon fiber precursors during the production of multi-spinning positions. This method ensures that the bundled fiber bundles are intact and smoothly transported without causing bifurcations or hairiness, significantly reducing the probability of roller entanglement due to operational errors. While existing techniques require the coordinated efforts of four or more people to complete this task, the method of the present invention requires only two people. Crucially, this method also reduces roller entanglement, increases production output, and ensures production stability.

[0040] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a schematic diagram of the arrangement of a wire collecting machine, a wire guide groove roller, a support roller, and a moving roller during the wire collecting method of a polyacrylonitrile carbon fiber precursor provided by an embodiment of the present invention; wherein, Figure 1 Figure A is a front view; Figure B is a top view of a portion of the device in Figure A;

[0042] Figure 2 1 is a structural schematic diagram of a wire guide groove roller provided by an embodiment of the present invention;

[0043] Figure 3 is a structural schematic diagram of a moving roller assembly provided by an embodiment of the present invention;

[0044] Figure 4 is a schematic diagram of fixing multiple support rollers provided by an embodiment of the present invention;

[0045] Figure 5 1 is a schematic structural diagram of a wire suction gun device used in an embodiment of the present invention;

[0046] Figure 6 The polyacrylonitrile-based carbon fiber precursor roll was obtained by the method of Experimental Example 1;

[0047] Figure 7 The polyacrylonitrile-based carbon fiber precursor roll was obtained by the method of Experimental Example 2;

[0048] Figure 8 This is a picture of the reverse entanglement and roller entanglement phenomenon;

[0049] Figure 9 The polyacrylonitrile-based carbon fiber precursor roll is obtained by the method of Comparative Example 1. DETAILED DESCRIPTION

[0050] To further illustrate the technical means and effects employed by the present invention to achieve its intended objectives, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention is provided in conjunction with the accompanying drawings and preferred embodiments. In the following description, different references to "one embodiment" or "embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.

[0051] Example 1

[0052] This embodiment provides a method for collecting polyacrylonitrile-based carbon fiber precursor, such as Figure 1As shown, it includes the following steps: the running tows of N spinning positions first pass through the wire guide roller 1 and then are placed on the wire collecting machine 2; wherein the number of wire collecting machines 2 is consistent with the number of spinning positions and corresponds one to one; wherein N is a positive integer greater than 1; wherein the N wire collecting machines 2 are arranged as follows:

[0053] N wire collecting machines 2 are arranged on the same horizontal plane; wherein, along the running direction of the yarn bundle, the wire collecting machine 2 is located downstream of the wire guide groove roller 1; wherein, each wire collecting machine 2 is located in the running direction of the yarn bundle at its corresponding spinning position; and, each wire collecting machine 2 is at a different distance from the wire guide groove roller 1, and multiple spinning positions are arranged in parallel. If the first spinning position on one side is farthest from the operating side, and the Nth spinning position on the other side is closest to the operating side, then: starting from the wire collecting machine 2 at the first spinning position to the wire collecting machine 2 at the Nth spinning position, the distance between the wire collecting machine 2 and the wire guide groove roller 1 is decreasing. (From Figure 1 It can be seen that, from the direction perpendicular to the paper surface, the distance between the wire collecting machine 2 and the wire guide groove roller 1 is decreasing).

[0054] This embodiment provides a method for collecting polyacrylonitrile-based carbon fiber precursor. During collection, the arrangement of the collection machines 2 described above can prevent interference and entanglement between tows at different spinning positions during operation and loading. This ensures that polyacrylonitrile-based carbon fiber precursor from multiple spinning positions can be smoothly loaded onto the collection machines 2, reducing the probability of roller entanglement and labor intensity. Furthermore, arranging N collection machines 2 on the same level facilitates tow stability.

[0055] Example 2

[0056] Preferably, this embodiment provides a method for collecting polyacrylonitrile-based carbon fiber precursor, compared with Example 1, as shown in FIG. Figure 1 and Figure 2 As shown, this embodiment further performs the following design:

[0057] The position of the wire guide groove roller 1 is 20-80 cm higher than the guide wheel on the wire collecting machine 2 to prevent the running wire bundle from falling and getting mixed into the transmission part.

[0058] In addition, multiple parallel yarn paths are provided on the godet roller 1. When the yarn tows from N spinning positions pass through the godet roller 1, the yarn tows from the same spinning position pass through the same yarn path on the godet roller 1, while the yarn tows from different spinning positions pass through different yarn paths on the godet roller 1. By providing multiple parallel yarn paths on the godet roller 1, the yarn tows from different spinning positions can be evenly separated, thus preventing interference and entanglement of the yarn tows from different spinning positions during operation and loading.

[0059] Preferably, the angle between the line connecting any two adjacent wire collectors and the running direction of the running yarn is θ; wherein θ is 2-5°. Preferably, the diameter distance L between the two adjacent wire collectors is related to the distance d between adjacent yarn paths on the wire godet roller, specifically L = d / sinθ; further preferably, d is 3-8 cm.

[0060] In addition, the roller surface of the wire guide groove is made of stainless steel or ceramic-plated or chrome-plated material, and its length is equivalent to the length of the front drive roller (to avoid the tow becoming fuzzy due to the contraction / expansion of the tow and the wear of the tow and the wire path).

[0061] Example 3

[0062] Preferably, this embodiment provides a method for collecting polyacrylonitrile-based carbon fiber precursor, compared with Example 2, as shown in FIG. Figure 1 and Figure 4 As shown, this embodiment further performs the following design:

[0063] If the distance between the Mth wire collector and the guide groove roller is greater than 2m and less than or equal to 5m, the running yarn bundle corresponding to the spinning position of the Mth wire collector needs to pass through at least one support roller 3 after passing through the guide groove roller 1, and then be put on the Mth wire collector; if the distance between the Mth wire collector and the guide groove roller 1 is greater than 5m and less than 9m, the running yarn bundle corresponding to the spinning position of the Mth wire collector needs to pass through at least 2 support rollers 2 after passing through the guide groove roller 1, and then be put on the Mth wire collector; preferably, the support roller is 20-80cm higher than the guide wheel on the wire collector; preferably, the diameter of the support roller is 3-8cm.

[0064] The support roller is made of any one of stainless steel, ceramic-plated stainless steel, and chrome-plated stainless steel.

[0065] It should be noted here that, according to the above embodiment, the distances between multiple wire collecting machines 2 and the wire guide groove roller 1 are different, and the running yarn bundles corresponding to the spinning positions of the wire collecting machines 2 that are farther away from the wire guide groove roller 1 may fall and be mixed into the transmission parts during the process of running from the wire guide groove roller 1 to the wire collecting machine 2 due to the long running distance; and this embodiment designs at least one support roller 3 to support the yarn bundles to prevent the yarn bundles from falling during operation (if they fall, they can easily be entangled on other wire collecting machines), further ensuring that the polyacrylonitrile-based carbon fiber precursors of multiple spinning positions can be smoothly put on the wire collecting machines, and reducing the probability of roller entanglement and manual labor intensity.

[0066] In addition, there are multiple support rollers 3, and the multiple support rollers 3 are arranged in sequence along the running direction of the filament bundle; and along the running direction of the filament bundle, the roller lengths of the support rollers 3 decrease.

[0067] Specifically, the length of the support roller is set as follows: the length of the support roller a=the number of spinning positions b×the distance between adjacent spinning positions c+the coefficient x; further preferably, the coefficient x is 5-15 cm.

[0068] Example 4

[0069] Preferably, this embodiment provides a method for collecting polyacrylonitrile-based carbon fiber precursor. Compared with the above embodiment, Figure 1 and Figure 3 As shown, this embodiment further performs the following design:

[0070] During the actual wire-collecting operation (bringing the tow to the godet of the wire-collecting machine and just putting it on the rack) and the winding roller replacement operation (replacing the winding roller on the wire-collecting machine), the drafting force is temporarily relaxed. The inventors have found that the tow may fall and droop, and then become entangled with the roller. Based on this problem, the present embodiment is further designed as follows:

[0071] A movable roller assembly is located near each wire collection unit 2. The movable roller assembly includes a movable roller 4. The movable roller 4 is used to lift the wire bundle during the loading operation or the replacement of the winding roller to prevent the wire bundle from being entangled. The movable roller 4 is only used during the loading and replacement of the winding roller and is not used during normal wire collection.

[0072] The movable roller 4 in the movable roller assembly can move. During the operation of putting on the shelf or replacing the winding roller, the movable roller 4 is controlled to move to the set position to lift the running wire bundle. After the operation of putting on the shelf or replacing the roller is completed, the movable roller 4 is retracted by moving.

[0073] Preferably, in order to facilitate the moving roller 4 to be moved out when in use (the maximum height to which the moving roller can be moved out is 100 cm), and to retract the moving roller 4 after use (the moving roller 4 is retracted immediately after use to avoid misoperation or the tow being entangled on the moving roller 4), the moving roller assembly of this embodiment is designed as follows:

[0074] The movable roller assembly includes: a longitudinal slide rail 41, a transverse slide bar 42, a movable roller structure, a first drive mechanism 43, and a second drive mechanism 46. Among them, one end of the transverse slide bar 42 is connected to the upper end of the longitudinal slide rail 41; the movable roller structure includes a movable roller 4 and a connecting rod; the upper end of the connecting rod is connected to the movable roller 4; the connecting rod is slidably connected to the transverse slide bar 42 (preferably connected through a slider 44). The first drive mechanism 43 is slidably connected to the longitudinal slide rail 41. The second drive mechanism 46 is drive-connected to the first drive mechanism 43 and is used to drive the first drive mechanism 43 to move up and down on the longitudinal slide rail 41. Among them, the lower end of the connecting rod is sleeved on the drive shaft of the first drive mechanism 43, and the drive shaft is arranged horizontally; and the lower end of the connecting rod is engaged with the drive shaft through a thread; among them, by controlling the first drive mechanism 43 and the second drive mechanism 46, the movable roller 4 is controlled to move longitudinally and transversely; preferably, the first drive mechanism 43 uses a motor; the second drive mechanism 46 is a drive cylinder. Preferably, a screw 45 is provided at the lower end of the connecting rod, and the screw 45 is sleeved on the driving shaft of the first driving mechanism 43, and the two are threadedly matched. By controlling the rotation of the driving shaft, the screw 45 is moved horizontally on the driving shaft, thereby driving the movable roller to move horizontally.

[0075] In addition, the vertical movement distance of the moving roller is less than or equal to 100 cm.

[0076] Example 5

[0077] Preferably, this embodiment provides a method for collecting polyacrylonitrile-based carbon fiber precursor. Compared with the above embodiment, Figure 1 and Figure 5 As shown, this embodiment further performs the following design:

[0078] When collecting the polyacrylonitrile-based carbon fiber precursor, a wire suction gun device is used to suck the filament bundle and pull it forward so that the running filament bundle crosses the wire guide groove roller; wherein, the wire suction gun device includes a support rod 51 and a wire suction gun 52. wherein, a wire guide ring 511 is provided at the upper end of the support rod 51. a wire suction port 521 is provided at the upper end of the wire suction gun 52, wherein the wire suction port 521 is trumpet-shaped; wherein, the wire suction gun 52 is used to connect to the air source. wherein, the running filament bundle is first passed through the wire guide ring 511 of the support rod 51, and then sucked into the wire suction gun 52 through the wire suction port 521. here, by making the wire suction port 521 on the wire suction gun 52 into a trumpet shape, the mouth area of ​​the wire suction port is increased, which is more convenient for wire suction. the wire suction gun 52 is supplied with compressed air through the suction pipe 522.

[0079] Preferably, the height of the support rod is 800-1300 mm, and the diameter of the guide wire ring is 5-10 cm.

[0080] Example 6

[0081] like Figures 1 to 5As shown, when the polyacrylonitrile-based carbon fiber precursor yarn collection method described in Examples 1-5 is used to carry out the yarn drawing and racking operation (filament collection function):

[0082] Use the wire suction gun device to suck the wire bundle and run it towards the wire collecting machine. The staff uses the wire guide rod to support the wire bundle behind it, bring the wire bundle above the wire guide groove roller 1, and place the wire bundle into the wire path of the wire guide groove roller 1. Make sure that the wire bundles at the same spinning position are placed in the same wire path on the wire guide groove roller 1; the wire bundles at different spinning positions are placed in different wire paths on the wire guide groove roller 1, and observe whether there is any possibility of back entanglement at any time to remind the wire-carrying person in front to continue belting.

[0083] For a wire collecting machine that is close to the godet roller 1, the tow at the spinning position corresponding to the wire collecting machine 2 can be directly brought to the wire collecting machine for the racking operation. During the racking operation, the movable roller 4 can be extended to allow the tow to pass through the movable roller 4 to prevent it from falling or drooping during the racking operation. After the racking operation, the movable roller 4 is retracted.

[0084] For a wire collection machine that is far away from the godet roller 1, the tow at the spinning position corresponding to the wire collection machine 2 is brought to the wire collection machine for a racking operation after passing through at least one support roller during the yarn-carrying process. During the racking operation, the movable roller 4 can be extended to allow the tow to pass through the movable roller 4 to prevent it from falling or drooping during the racking operation. After the racking operation, the movable roller 4 is retracted.

[0085] In addition, when the winding roller on the wire collecting machine has wound the wire bundle to the target length, the operator first extends the movable roller 4 and places it above the wire collecting machine, turns on the suction switch of the wire collecting machine, cuts the wire bundle, puts it into the suction switch for suction, pulls the wire bundle onto the movable roller, raises the movable roller 4 to prevent the wire bundle from being entangled, and then replaces the wire bundle with a new winding roller. Then, the running wire bundle is cut from the suction switch of the wire collecting machine, sucked with a wire suction gun, lowers the movable roller 4, and uses the wire suction gun device to rewind it onto the rack. After completing the replacement of the upper and lower racks, the movable roller is retracted.

[0086] Experimental Example 1

[0087] This experimental example 1 mainly adopts the above-mentioned scheme of the embodiment of the present invention to collect T800S-12k polyacrylonitrile-based carbon fiber precursor. Figure 1 As shown:

[0088] The running yarn bundles of the six spinning positions first pass through the guide groove roller 1 and then are placed on the wire collecting machine. The number of wire collecting machines 2 is the same as the number of spinning positions and corresponds one to one. The six wire collecting machines 2 are arranged as follows:

[0089] The six wire collectors are arranged on the same horizontal plane; the wire collectors 6 are located downstream of the godet roller 1 along the direction of travel of the yarn tow; each wire collector is located in the direction of travel of the yarn tow at its corresponding spinning position; and each wire collector 6 is at a different distance from the godet roller 1. The six spinning positions are arranged in parallel. If the first spinning position on one side is farthest from the operating side and the sixth spinning position on the other side is closest to the operating side, then: starting from the wire collector at the first spinning position to the wire collector at the sixth spinning position, the distance between the wire collectors and the godet roller decreases. Furthermore, the angle between the line connecting any two adjacent wire collectors 2 and the direction of travel of the running yarn tow is θ, where θ is 2-5°. The diameter distance L between the two adjacent wire collectors is related to the distance d between adjacent yarn paths on the godet roller, specifically L = d / sinθ, where d is 3-8 cm.

[0090] Among them, the specific wire collection operation is as follows:

[0091] Use the wire suction gun device to suck the wire bundle and run it towards the wire collecting machine. The staff uses the wire guide rod to support the wire bundle behind it, bring the wire bundle above the wire guide groove roller 1, and place the wire bundle into the wire path of the wire guide groove roller 1. Make sure that the wire bundles at the same spinning position are placed in the same wire path on the wire guide groove roller 1; the wire bundles at different spinning positions are placed in different wire paths on the wire guide groove roller 1, and observe whether there is any possibility of back entanglement at any time to remind the wire-carrying person in front to continue belting.

[0092] For a wire collector that is less than or equal to 2 meters away from the godet roller 1 (e.g., the wire collector corresponding to the sixth spinning position), the tow corresponding to the spinning position of the wire collector can be directly brought to the wire collector for the racking operation. During the racking operation, the movable roller 4 can be extended to allow the tow to pass through the movable roller 4 to prevent it from falling or drooping during the racking operation. After the racking operation, the movable roller 4 is retracted.

[0093] For a wire collecting machine that is more than 2m away from the guide groove roller 1 (e.g., a wire collecting machine corresponding to the 1st to 5th spinning positions), the yarn bundles corresponding to the spinning positions of the wire collecting machine 2 are brought to the wire collecting machine for the shelving operation after passing through at least one support roller during the wire-carrying process (the yarns of the 5th and 4th spinning positions need to pass through one support roller; the yarns of the 3rd and 2nd spinning positions need to pass through two support rollers; the yarns of the 1st spinning position need to pass through three support rollers); during the shelving operation, the movable roller 4 can be extended to allow the yarn bundles to pass through the movable roller 4 to prevent them from falling or drooping during the shelving operation. After the shelving operation, the movable roller 4 is retracted.

[0094] In addition, when the winding roller on the wire collecting machine has wound the wire bundle to the target length, the operator first extends the movable roller 4 and places it above the wire collecting machine, turns on the suction switch of the wire collecting machine, cuts the wire bundle, puts it into the suction switch for suction, pulls the wire bundle onto the movable roller, raises the movable roller 4 to prevent the wire bundle from being entangled, and then replaces the wire bundle with a new winding roller. Then, the running wire bundle is cut from the suction switch of the wire collecting machine, sucked with a wire suction gun, lowers the movable roller 4, and uses the wire suction gun device to rewind it onto the rack. After completing the replacement of the upper and lower racks, the movable roller is retracted.

[0095] By adopting the yarn collection method of this experimental embodiment, the fiber bundle runs smoothly and intact without causing bifurcation or fuzz, greatly reducing the probability of roller entanglement due to operational errors. Only two people are required to complete the yarn collection and racking operation.

[0096] Among them, the polyacrylonitrile-based carbon fiber precursor roll obtained in Experimental Example 1 is used. Figure 6 As shown, it can be clearly seen that the polyacrylonitrile-based carbon fiber precursor roll obtained by adopting the winding method of Experimental Example 1 has basically no lint phenomenon.

[0097] Experimental Example 2

[0098] Experimental Example 2 primarily employed the aforementioned scheme of the present invention to collect T800S-12k polyacrylonitrile-based carbon fiber precursor. The difference between Experimental Example 2 and Experimental Example 1 was that the angle θ between the line connecting any two adjacent collection machines 2 and the running direction of the running tow was 10°.

[0099] Others are consistent.

[0100] Here, compared with Experimental Example 1, since the angle θ of Experimental Example 2 is increased, the angle of the yarn bundle deviating from the wire guide roller to the corresponding wire collecting machine (especially the spinning positions on both sides) is large, the yarn is easily worn, there is resistance in the yarn winding process, the yarn bundle is easily worn, and even the yarn is broken, resulting in damaged appearance and decreased performance.

[0101] Among them, the polyacrylonitrile-based carbon fiber precursor roll obtained in Experimental Example 2 is used. Figure 7 As shown, it can be clearly seen that the polyacrylonitrile-based carbon fiber precursor coil obtained by the winding method of Experimental Example 2 has a little grinding, and the overall effect is good, but not as good as that of Experimental Example 1.

[0102] Experimental Example 3

[0103] This Experimental Example 3 mainly adopts the above-mentioned solution of the embodiment of the present invention to collect T800S-12k polyacrylonitrile-based carbon fiber precursor. The difference between this Experimental Example 3 and Experimental Example 1 is that no moving roller is provided in front of each collection machine.

[0104] Others are consistent.

[0105] Here, compared with Experimental Example 1, Experimental Example 3 does not have a moving roller, so the loading and unloading process requires multiple people to work, such as Comparative Example 1. In addition, Experimental Example 3 is prone to back-entanglement (see the phenomenon of back-entanglement and roller entanglement for details). Figure 8 As shown in the figure, the wire may break when winding the roller, and the operator's tools or hands or other limbs may be easily caught in the wire, causing an accident.

[0106] Experimental Example 4

[0107] This Experimental Example 4 mainly adopts the above-mentioned solution of the embodiment of the present invention to collect T800S-12k polyacrylonitrile-based carbon fiber precursor. The difference between this Experimental Example 4 and Experimental Example 1 is that the movable roller is not retracted after use.

[0108] Others are consistent.

[0109] Here, compared with the experimental example, the movable roller in experimental example 4 is not retracted, so that the broken silk at a certain spinning position is easily hooked on the movable roller, affecting the operation of the spinning position next to it where the silk is not broken, resulting in entanglement with the roller, causing an increase in the number of broken silk spinning positions. More seriously, too much entanglement with the roller can easily damage related parts of the wire collecting machine and other equipment, or too much entanglement can cause the wire collecting machine and other equipment to be moved.

[0110] Comparative Example 1

[0111] Comparative Example 1 is to use the existing technology to collect T800S-12k polyacrylonitrile-based carbon fiber precursor, wherein:

[0112] The running yarns from the six spinning positions are first passed through the guide groove rollers 1 and then placed on the wire collecting machine. The number of wire collecting machines 2 is the same as the number of spinning positions, and they correspond one to one. The six wire collecting machines 2 are arranged as follows: the six wire collecting machines are distributed in two layers.

[0113] Among them, the specific wire collection operation is as follows:

[0114] The wire bundle is sucked by the wire suction gun device and moved toward the wire collecting machine. The staff uses the wire guide rod to support the wire bundle behind it, brings the wire bundle above the wire guide groove roller, and places the wire bundle into the wire path of the wire guide groove roller. It is ensured that the wire bundles at the same spinning position are placed in the same wire path on the wire guide groove roller; the wire bundles at different spinning positions are placed in different wire paths on the wire guide groove roller, and observes whether there is any possibility of back-entanglement at any time, reminds the wire-carrying personnel in front, and continues to bring the wire to the wire collecting machine for the racking operation. During the racking operation, staff member 1 uses the wire suction gun to wrap the wire on the rack, staff member 2 uses the wire guide rod to support the wire behind it, and staff member 3 presses the wire down at the drafting roller. The wire is easy to be entangled on the drafting roller or hung on the wire collecting machine of the adjacent spinning position.

[0115] When the winding roller on the wire collecting machine winds the wire bundle to the target length, worker 1 turns on the suction switch of the wire collecting machine, cuts the wire bundle, and puts it into the suction switch for suction. After worker 1 replaces the wire bundle with a new winding roller, he cuts the running wire bundle from the suction switch of the wire collecting machine, sucks it with a wire suction gun, and uses the wire suction gun device to rewind it onto the rack to complete the upper and lower rack replacement. During the whole process, worker 2 holds the wire guide rod to support the wire behind worker 1, and workers 3 and 4 are about 2m behind worker 2, holding up the wire with the wire guide rod. The wire is easy to be entangled or hung on the wire collecting machine at the adjacent spinning position.

[0116] Compared with the solution of the present invention, the wire collecting machine of comparative example 1 is arranged on two layers, which is time-consuming to operate and has great safety hazards. In particular, the two-layer wire collecting machine is placed on and off the shelves. During the wire loading process, the personnel need to go from the first layer to the second layer. During the process, the suction force of the wire suction gun is insufficient, resulting in reverse entanglement or causing personnel to trip and become entangled in the wire bundle, leading to accidents.

[0117] Moreover, in Example 1, no support roller is provided. For the spinning position where the wire collecting machine is far away from the wire guide groove roller, the yarn bundle is easy to fall during operation, and the staff need to pay more attention. Sometimes the staff need to use the wire guide rod to support it, which increases the labor intensity of the staff and easily causes the yarn bundle to be entangled.

[0118] In addition, in Example 1, no movable roller is provided, so the process of loading and unloading the wires requires multiple people to operate, which is prone to back-entanglement, causing wire breakage on the winding roller, and easily involving tools or hands and other limbs in the hands of the operators, causing accidents.

[0119] The polyacrylonitrile-based carbon fiber precursor roll obtained in Comparative Example 1 is shown in FIG. Figure 9 As shown, it can be clearly seen that the appearance of the polyacrylonitrile-based carbon fiber precursor roll obtained by adopting the winding method of Comparative Example 1 is obviously poor (there are broken strands in the middle, and the hairs and yarns are seriously worn).

[0120] In summary, the present invention provides a method for collecting polyacrylonitrile carbon fiber precursor, ensuring smooth and complete fiber bundle operation without causing bifurcation or fuzz, significantly reducing the probability of roller entanglement due to operational errors. Only two people are required to complete the collection and racking operation.

[0121] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiment based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for collecting polyacrylonitrile-based carbon fiber precursor, characterized in that: The method comprises the following steps: firstly passing the running yarn tows of N spinning positions through the guide groove rollers and then being mounted on the wire collecting machine; wherein the number of the wire collecting machines is the same as the number of the spinning positions and corresponds to each other; wherein N is a positive integer greater than 1; wherein the N wire collecting machines are arranged as follows: N wire collecting machines are arranged on the same horizontal plane; wherein, along the running direction of the tow, the wire collecting machine is located downstream of the wire guide groove roller; wherein, each wire collecting machine is located in the running direction of the tow at its corresponding spinning position; and, each wire collecting machine is at a different distance from the wire guide groove roller, and multiple spinning positions are arranged in parallel. If the first spinning position on one side is farthest from the operating side and the Nth spinning position on the other side is closest to the operating side, then: starting from the wire collecting machine at the first spinning position to the wire collecting machine at the Nth spinning position, the distance between the wire collecting machine and the wire guide groove roller shows a decreasing trend; Among them, if the distance between the Mth wire collector and the wire guide groove roller is greater than 2m and less than or equal to 5m: the running wire tow corresponding to the spinning position of the Mth wire collector needs to pass through at least one support roller after passing through the wire guide groove roller, and then be placed on the Mth wire collector; If the distance between the Mth wire collector and the guide groove roller is greater than 5m and less than 9m: the running yarn bundle corresponding to the spinning position of the Mth wire collector needs to pass through at least 2 support rollers after passing through the guide groove roller, and then be mounted on the Mth wire collector.

2. The method for collecting polyacrylonitrile-based carbon fiber precursor according to claim 1, characterized in that: The godet roller is provided with a plurality of parallel wire paths; wherein, when the running yarn bundles of N spinning positions pass through the godet roller: the yarn bundles of the same spinning position pass through the same wire path on the godet roller; the yarn bundles of different spinning positions pass through different wire paths on the godet roller; and / or The position of the wire guide groove roller is 20-80 cm higher than the guide wheel on the wire collecting machine to prevent the running wire bundle from falling and being mixed into the transmission part.

3. The method for collecting polyacrylonitrile-based carbon fiber precursor according to claim 1, characterized in that: The angle between the line connecting any two adjacent wire collecting machines and the running direction of the running wire bundle is θ; wherein θ is 2-5°.

4. The method for collecting polyacrylonitrile-based carbon fiber precursor according to claim 3, characterized in that: The diameter distance L between two adjacent wire collecting machines is related to the distance d between adjacent wire paths on the wire guide groove roller, specifically L=d / sinθ.

5. The method for collecting polyacrylonitrile-based carbon fiber precursor according to claim 4, characterized in that: d is 3-8cm.

6. The method for collecting polyacrylonitrile-based carbon fiber precursor according to claim 1, characterized in that: The support roller is 20-80 cm higher than the guide wheel on the wire collecting machine.

7. The method for collecting polyacrylonitrile-based carbon fiber precursor according to claim 1, characterized in that: The diameter of the support roller is 3-8 cm.

8. The method for collecting polyacrylonitrile-based carbon fiber precursor according to claim 1, characterized in that: The length of the support roller is set as follows: length of the support roller = number of spinning positions × distance between adjacent spinning positions + coefficient x; wherein the coefficient x is 5-15 cm.

9. The method for collecting polyacrylonitrile-based carbon fiber precursor according to claim 1, characterized in that: The support roller is made of any one of stainless steel, ceramic-plated stainless steel, and chrome-plated stainless steel.

10. The method for collecting polyacrylonitrile-based carbon fiber precursor according to claim 1, characterized in that: A moving roller assembly is provided near each wire collecting machine; the moving roller assembly includes a moving roller; wherein the moving roller is used to lift the wire bundle during the operation of placing the wire bundle on a shelf or replacing the winding roller to prevent the wire bundle from being entangled.

11. The method for collecting polyacrylonitrile-based carbon fiber precursor according to claim 10, characterized in that: The movable roller in the movable roller assembly can move. During the operation of putting on the rack or replacing the winding roller, the movable roller is controlled to move to a set position to lift the running wire bundle. After the operation of putting on the rack or replacing the roller is completed, the movable roller is retracted by moving.

12. The method for collecting polyacrylonitrile-based carbon fiber precursor according to claim 10, characterized in that: The moving roller assembly comprises: longitudinal slide rails; a transverse slide bar, one end of which is connected to the upper end of the longitudinal slide rail; A movable roller structure, comprising a movable roller and a connecting rod; the upper end of the connecting rod is connected to the movable roller; the connecting rod is slidably connected to the transverse sliding rod; a first driving mechanism connected to the longitudinal slide rail; a second driving mechanism, the second driving mechanism being connected to the first driving mechanism and being used to drive the first driving mechanism to move up and down on the longitudinal slide rail; The lower end of the connecting rod is sleeved on the driving shaft of the first driving mechanism, and the lower end of the connecting rod is engaged with the driving shaft through a thread; the driving shaft is arranged horizontally; The movable roller is controlled to move longitudinally and transversely by controlling the first driving mechanism and the second driving mechanism.

13. The method for collecting polyacrylonitrile-based carbon fiber precursor according to claim 12, characterized in that: The first driving mechanism is a motor; the second driving mechanism is a driving cylinder.

14. The method for collecting polyacrylonitrile-based carbon fiber precursor according to claim 1, characterized in that: When collecting polyacrylonitrile-based carbon fiber precursor, a wire suction gun device is used to suck the tow and pull it forward so that the running tow crosses the wire guide groove roller; wherein the wire suction gun device includes: A support rod, wherein the upper end of the support rod is provided with a guide wire ring; A wire suction gun, wherein the upper end of the wire suction gun is provided with a wire suction port, wherein the wire suction port is trumpet-shaped; wherein the wire suction gun is used to connect to an air source; The running silk bundle is firstly passed through the wire guide ring of the support rod and then sucked into the silk suction gun through the silk suction port.

15. The method for collecting acrylonitrile-based carbon fiber precursor according to claim 14, characterized in that: The height of the support rod is 800-1300 mm, and the diameter of the guide wire ring is 5-10 cm.

16. The method for collecting polyacrylonitrile-based carbon fiber precursor according to claim 1, characterized in that: When collecting polyacrylonitrile-based carbon fiber precursor: use the wire suction gun device to suck the yarn bundle and run it towards the wire collecting machine. The staff uses the wire guide rod to support the yarn bundle behind it, bring the yarn bundle above the wire guide groove roller, and put the yarn bundle into the wire path of the wire guide groove roller. Make sure that the yarn bundles at the same spinning position are placed in the same wire path on the wire guide groove roller; the yarn bundles at different spinning positions are placed in different wire paths on the wire guide groove roller, and observe at any time whether there is any possibility of back entanglement, and continue to bring the yarn until the rack is completed.

17. The method for collecting polyacrylonitrile-based carbon fiber precursor according to claim 16, characterized in that: The step of continuing to carry the wire until the wire is put on the rack comprises: For the spinning position where the distance between the wire collecting machine and the wire guide roller is less than or equal to 2m, the tow corresponding to the spinning position of the wire collecting machine is directly brought to the wire collecting machine for the racking operation; during the racking operation, the moving roller is extended to allow the tow to pass through the moving roller to prevent it from falling or drooping during the racking operation; after the racking operation, the moving roller is retracted; For the spinning position where the distance between the wire collecting machine and the wire guide groove roller is greater than 2m, the yarn bundle corresponding to the spinning position of the wire collecting machine is brought to the wire collecting machine for the shelving operation after passing through at least one supporting roller during the wire-carrying process; during the shelving operation, the moving roller is extended to allow the yarn bundle to pass through the moving roller to avoid falling and drooping during the shelving operation; after the shelving operation, the moving roller is retracted.

18. The method for collecting polyacrylonitrile-based carbon fiber precursor according to claim 1, characterized in that: When replacing the winding roller, extend the moving roller, turn on the suction switch of the wire collecting machine, cut the wire bundle and put it into the suction switch for suction, then cut the running wire bundle from the suction switch of the wire collecting machine, suck it with the wire suction gun device, and then pull the running wire bundle onto the moving roller, raise the moving roller to support the wire bundle and prevent the wire bundle from being entangled; After replacing the new winding roller, lower the moving roller and use the wire suction gun device to bring the running wire bundle back into the upper rack.

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