A fiber preparation device for polytetrafluoroethylene oriented rod

Abstract

This invention belongs to the field of polytetrafluoroethylene (PTFE) special fiber preparation technology, specifically disclosing a fiber preparation device for PTFE oriented rods. The device includes a base, with a fixing mechanism at the first end of the base. The fixing mechanism cooperates with a filament-raising mechanism mounted on the base. A filament-receiving mechanism, movably connected to the base, is located on the side of the filament-raising mechanism away from the fixing mechanism. The fixing mechanism includes a fixing plate at the first end of the base, with a radial top cone at the end of the fixing plate near the base. This invention fixes one end of the PTFE oriented rod, and, in conjunction with the filament-raising mechanism, performs continuous layer-by-layer tearing and peeling of the rod. Simultaneously, the filament-receiving mechanism completes fiber winding. This allows for control of the tearing force, feed speed, and winding tension, effectively avoiding problems such as uneven filament linear density, filament breakage, and excessive fibrillation during processing. It can produce continuous PTFE filaments with stable performance and uniform specifications.

Description

Technical Field

[0001] This invention belongs to the field of polytetrafluoroethylene (PTFE) special fiber preparation technology, specifically relating to a fiber preparation device for PTFE oriented rods. Background Technology

[0002] Polytetrafluoroethylene (PTFE) possesses excellent chemical corrosion resistance, high and low temperature resistance, low friction, high insulation and biocompatibility. Its continuous filament fiber is an irreplaceable special core material in key fields such as chemical environmental protection, high-end medical, aerospace and new energy, and has extremely high industrial value and market demand.

[0003] Due to the inherent structural characteristics of polytetrafluoroethylene (PTFE), its melt viscosity is extremely high, its decomposition temperature is lower than its viscous flow temperature, and it cannot be dissolved by conventional industrial solvents. Therefore, it is impossible to use the melt spinning and solution spinning processes commonly used in the chemical fiber industry to prepare continuous filaments. Currently, the three mainstream preparation technologies in the industry—emulsion spinning, paste extrusion, and membrane splitting—all have inherent defects that make it difficult to balance production costs, product performance, environmental protection, and production stability. They are either lengthy processes with excessive energy consumption and equipment investment, or have insufficient product performance and limited applicability. The industry urgently needs a solution for preparing continuous PTFE filaments that has a shorter process, lower cost, and wider applicability.

[0004] Existing research and experimental results on polymer material structures show that oriented rods of PTFE or expanded PTFE, obtained by extruding PTFE paste and stretching it at a high ratio, exhibit a significant axially highly oriented structure within the PTFE molecular chains. They also possess a unique aggregated structure where fibrils and nodes are interconnected, providing a sufficient structural basis for separating continuous filament fibers along the orientation direction. By applying a controllable axial tearing force to these PTFE rods, continuous PTFE filament fibers with high orientation and excellent mechanical properties can be obtained by peeling them along the molecular chain orientation direction.

[0005] This preparation process does not require complex high-temperature sintering or high-pressure extrusion equipment, significantly shortening the process flow. It can directly use commercially available mature polytetrafluoroethylene rods as raw materials, significantly reducing the preparation cost. Furthermore, the filament linear density can be flexibly adjusted by controlling the tearing parameters. At the same time, it can avoid the pollution problems of waste gas, wastewater, and solid waste from traditional spinning processes. It has significant technical, economic, and environmental advantages and broad prospects for industrial application.

[0006] However, the industry currently lacks specialized equipment capable of achieving stable, continuous, and large-scale production of the aforementioned processes. Existing conventional fiber slitting and peeling equipment cannot adapt to the structural characteristics of high-strength PTFE and expanded PTFE rod materials, and cannot precisely control tearing force, linear speed, and feeding and winding tension in a closed-loop manner. This easily leads to problems such as uneven filament linear density, filament breakage, and excessive fibrillation during processing, making it impossible to produce continuous PTFE filaments with stable performance and uniform specifications. Furthermore, manual tearing operations in the laboratory present the following problems: 1. Fiber scattering and entanglement: The peeled fibers fall freely as the operator moves their hands, which can easily cause entanglement and knots, affecting the subsequent use of the fibers.

[0007] 2. Inability to continuously rewind: Stripping and rewinding cannot be carried out simultaneously. The operator needs to manually wind a section of fiber onto the take-up machine after stripping it, interrupting the stripping process and resulting in low efficiency.

[0008] 3. Uncontrollable peeling depth: The depth of manual insertion depends entirely on the operator's feel, making it difficult to guarantee that the fiber thickness is consistent each time it is peeled, and the fiber size uniformity is poor.

[0009] 4. Low success rate of fiber lifting: The surface of polytetrafluoroethylene is smooth and the coefficient of friction is extremely low. When the needle tip is pulled axially, it is very easy to slip off from the fiber head, and multiple attempts are required to successfully lift the fibers. Summary of the Invention

[0010] To address the aforementioned issues, a fiber preparation apparatus for polytetrafluoroethylene oriented rods is provided, which can improve the safety of trench testing.

[0011] To achieve the above objectives, the present invention is implemented through the following technical solution: The present invention provides a fiber preparation device for polytetrafluoroethylene oriented rods, including a base, a fixing mechanism at the first end of the base, the fixing mechanism cooperating with a fiber raising mechanism disposed on the base, and a fiber taking mechanism movably connected to the base on the side of the fiber raising mechanism away from the fixing mechanism; the fixing mechanism includes a fixing plate disposed at the first end of the base, and a radial top cone disposed at the end of the fixing plate near the base.

[0012] Preferably, the wire raising mechanism includes a wire raising gantry frame, on which a detachable wire raising structure is provided. The wire raising structure includes a wire raising cylinder detachably connected to the wire raising gantry frame. A pressing column is provided inside the wire raising cylinder, and the pressing column is connected to a wire raiser located at the bottom end of the wire raising cylinder through a crank connecting rod.

[0013] Preferably, the wire raiser includes a wire raising drive shaft sleeved inside the bottom end of the wire raising cylinder, and the top end of the wire raising drive shaft is connected to the inner cavity of the wire raising cylinder through a wire raising spring; the crank connecting rod includes a pressing connecting rod rotatably connected to the pressing column, and the movable end of the pressing connecting rod is rotatably connected to the wire raising component disposed on the wire raising drive shaft through a connecting rod shaft.

[0014] Preferably, the wire raising component includes a wire raising connecting rod rotatably connected to the pressing connecting rod, a wire raising movable rod connected to the end of the wire raising connecting rod away from the pressing connecting rod, and a wire raising needle connected to the end of the wire raising movable rod, the wire raising needle being provided with wire hooks and barbs.

[0015] Preferably, the starting drive shaft includes a pair of semi-circular drive plates connected by a starting shaft, with a starting gap between the semi-circular drive plates and a fiber groove at the bottom of the semi-circular drive plates; the starting shaft is rotatably connected to a crank starting hole located at the connection between the starting connecting rod and the starting movable rod.

[0016] Preferably, a pressing spring connected to the wire-raising cylinder is sleeved on the pressing column, and the top end of the pressing spring is connected to the pressing plate set at the top end of the pressing column; a pressing through hole is provided on the side of the pressing column, and a pressing shaft connected to the pressing connecting rod is provided in the pressing through hole.

[0017] Preferably, the pressing through hole corresponds to the wire raising through hole penetrating the side of the wire raising cylinder, and the wire raising through hole corresponds to the wire raising gap; the wire raising drive shaft is an inverted frustum type.

[0018] Preferably, the wire-starting spool engages with the wire-starting hole of the gantry frame, and the top of the wire-starting spool is provided with detachable wire-starting baffles on both sides, which engage with the baffle slots on both sides of the wire-starting hole of the gantry frame.

[0019] Preferably, the base has a V-shaped groove on its axis of symmetry that is parallel to the direction of the long side of the base, and T-shaped guide grooves are symmetrically arranged on both sides of the V-shaped groove; the radial top cone extends into the V-shaped groove.

[0020] Preferably, the take-up mechanism includes a take-up gantry frame, inside which a take-up roller is installed. A take-up roller shaft is located at the center of the take-up roller, and spring plates are connected to both ends of the take-up roller shaft. A pre-tensioned compression spring, connected to the top plate of the spring plate, is provided on the top surface of the spring plate. Vertical guide grooves, engaging with the ends of the spring plates, are provided on the inner walls of both side plates of the take-up gantry frame. These vertical guide grooves engage with T-shaped guide plates located at the ends of the spring plates. Inverted T-shaped sliding plates, engaging with the T-shaped guide grooves, are provided at both bottom ends of the take-up gantry frame. An adhesive layer is applied to the surface of the take-up roller. The surface of the take-up roller is knurled. Miniature rollers, cooperating with the T-shaped guide grooves, are provided at both bottom ends of the take-up gantry frame to achieve rolling guidance. The pre-tensioned compression spring is an adjustable rubber torsion spring.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) This invention fixes one end of the polytetrafluoroethylene oriented rod and uses a filament-raising mechanism to continuously tear and peel the rod layer by layer. It also uses a filament-winding mechanism to simultaneously wind the fibers. This invention can solve the problem of the lack of special production equipment suitable for this process in the prior art. It can control the tearing force, feed speed and winding tension, and effectively avoid problems such as uneven filament linear density, filament breakage and excessive fibrillation during the processing. It can prepare continuous polytetrafluoroethylene filaments with stable performance and uniform specifications. It can reliably, stably and dimensionally controllablely peel continuous filament fibers layer by layer from the polytetrafluoroethylene oriented rod.

[0022] (2) The present invention can convert the vertical pressing pressure into the oblique feeding action of the filament raising mechanism through the filament raising structure. When the pressing column moves downward, it can drive the filament raising needle to extend obliquely and pierce the surface of the polytetrafluoroethylene oriented rod. With the barbs set on the filament raising needle, the fiber head can be effectively hooked to avoid the filament raising needle from slipping, thus improving the success rate of filament raising. At the same time, the piercing depth can be stably controlled to ensure that the fiber thickness is consistent each time it is peeled off, thereby improving the fiber size uniformity.

[0023] (3) The present invention uses a fiber winding mechanism that can move along the base guide groove to simultaneously complete fiber winding during the fiber stripping process, without interrupting the stripping process for manual winding, which can greatly improve processing efficiency and at the same time avoid the stripped fibers from falling freely and getting tangled, ensuring that the fibers are neatly wound.

[0024] (4) The filament raising structure of the present invention is detachable, and the filament raising mechanism with corresponding parameters can be replaced according to the specifications of the target fiber. The linear density of the prepared polytetrafluoroethylene filament can be flexibly adjusted to meet different production needs, and the device has strong adaptability. The present invention is a simple mechanical device that does not require electric drive and can peel off micron-level fibers layer by layer from the surface of polytetrafluoroethylene oriented rods and realize fiber winding through manual operation. (5) The present invention provides a fixed unidirectional barb at a certain distance from the tip of the starting needle, which forms a set acute angle with the starting needle; when the starting needle is inserted into the polytetrafluoroethylene oriented rod in the tangential direction, the inclined surface of the barb is inserted in the same direction, which generates only a small puncture resistance and will not cut the fiber in advance; when the starting needle is reset upward, the barb will directly clamp the target fiber bundle, forming a stable bite on the fiber; the structure of the starting needle can solve the technical problem that the traditional hook needle is difficult to effectively hook the fiber and is easy to slip due to the smooth surface of the polytetrafluoroethylene material and the extremely low coefficient of friction.

[0025] (6) The present invention adds a fiber groove at the bottom of the fiber-raising drive shaft. The fiber groove can change the determination of the peeling depth from relying on manual experience to relying on mechanical structure limit, which can achieve precise control of fiber thickness and maintain batch consistency of peeled fibers. Compared with ordinary unrestrained fiber raising, it can effectively reduce the fiber thickness error of each peeling.

[0026] (7) The present invention can achieve radial and axial constraints on the polytetrafluoroethylene oriented rod through the V-groove on the base and the fixing mechanism, thereby ensuring that the winding movement direction is strictly parallel to the rod axis (fiber orientation direction); at the same time, the pre-tight compression springs on both sides of the winding roller can firmly press the polytetrafluoroethylene oriented rod into the V-groove by applying stable pressure to the spring plate, further suppressing its up and down swing; the present invention can ensure that the winding movement direction is strictly parallel to the rod axis, providing a guarantee for obtaining continuous and unbroken filament fibers.

[0027] (8) This invention provides a novel process for preparing polytetrafluoroethylene filament fibers—using polytetrafluoroethylene oriented rods as a whole as “fiber blanks” and transforming them into a batch of filament fibers of the same size and specifications through a subtractive process of peeling off layer by layer; this invention differs from the additive process of “building fibers from resin monomers” in traditional paste extrusion spinning, and can greatly simplify the intermediate steps from raw materials to finished fiber products.

[0028] (9) The preparation process of the present invention is extremely simple: The present invention can directly convert polytetrafluoroethylene oriented rods into filament fibers, which can eliminate the mixing, spinning, sintering and carrier removal processes in the emulsion spinning method, as well as the film making, cutting and fiber opening processes in the film splitting method; the preparation process can be simplified from multiple processes to a single step.

[0029] (10) The fiber size stripped by the present invention is precisely controllable: the fiber diameter is determined by the depth of the fiber groove and can be stably controlled within the range of 20μm~200μm; by replacing the fiber-raising drive shaft with fiber grooves of different limiting depths, the present invention can flexibly adjust the fiber stripping specifications to meet different application requirements.

[0030] (11) The present invention has good continuity and high orientation of the peeled fibers: The present invention strictly follows the fiber axis during the peeling process, and the internal structure of the resulting fiber maintains the original high orientation of the rod, with excellent mechanical properties. A long filament fiber with a length equivalent to that of the rod can be obtained in one peeling stroke.

[0031] (12) The present invention has a high material utilization rate: The present invention consumes the entire rod layer by layer from the surface to the core. Except for the last possible extremely fine mandrel, the entire rod can be almost completely converted into fiber products, and the material utilization rate is extremely high.

[0032] (13) The equipment cost of the present invention is extremely low: the present invention does not require a heating system, motor drive or complex control, and the manufacturing cost is far lower than that of existing spinning or film splitting equipment.

[0033] (14) The present invention has good potential for automation upgrade: The present invention can be operated manually, and in the future, it can be upgraded with kits to achieve large-scale and automated production. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram showing the connection between the base and the fixing mechanism in this invention; Figure 3 This is a schematic diagram of the base and fixing mechanism in this invention; Figure 4 This is a schematic diagram of the wire-forming mechanism in this invention; Figure 5 This is a schematic diagram of the wire-reinforcing gantry frame in this invention; Figure 6 This is a schematic diagram of the fiber-forming structure in this invention; Figure 7 This is an exploded schematic diagram of the fiber-forming structure in this invention; Figure 8 This is a schematic diagram of the pressing column in this invention; Figure 9 This is a schematic diagram of the structure of the wire-generating device in this invention; Figure 10 This is a schematic diagram of the structure of the wire-generating cylinder in this invention; Figure 11 This is a schematic diagram of the winding mechanism in this invention; Figure 12 This is a schematic diagram of the wire-retracting gantry frame in this invention; Figure 13 This is a schematic diagram of the connection between the take-up roller shaft and the spring plate in this invention; Figure 14 This is a schematic diagram of the winding roller in this invention.

[0035] In the diagram, 1 is the base; 2 is the take-up mechanism; 3 is the take-up mechanism; 4 is the fixing mechanism; 5 is the T-shaped guide groove; 6 is the V-shaped groove; 7 is the PTFE oriented rod; 201 is the take-up gantry; 202 is the spring plate; 203 is the pre-tensioned compression spring; 204 is the take-up roller; 205 is the inverted T-shaped slide plate; 206 is the vertical guide groove; 207 is the take-up roller shaft; 208 is the T-shaped guide plate; 301 is the take-up gantry; 302 is the pressing column; 303 is the pressing plate; 304 is the pressing spring; 305 is the take-up cylinder; 306 is the crank connecting rod; and 307 is the take-up device. 307; Gantry frame starting hole; 308; Starting baffle; 309; Starting through hole; 310; Starting gap; 311; Starting shaft; 312; Starting drive shaft; 313; Fiber groove; 314; Starting needle; 315; Starting movable rod; 316; Starting connecting rod; 317; Connecting rod shaft; 318; Pressing connecting rod; 319; Pressing shaft; 320; Connecting rod rotating hole; 321; Pressing through hole; 322; Starting spring; 323; Semi-circular transmission plate; 324; Wire hook barb; 325; Fixing plate; 401; Radial top cone; 402. Detailed Implementation

[0036] The present invention will be further illustrated by specific embodiments below, but this does not limit the scope of the invention. Example 1

[0037] A fiber preparation apparatus for polytetrafluoroethylene oriented rods, the structure of which is as follows: Figure 1-14 As shown, it includes a base 1, and a fixing mechanism 4 is provided at the first end of the base 1. The fixing mechanism 4 cooperates with the starting mechanism 3 provided on the base 1. The starting mechanism 3 is provided with a winding mechanism 2 that is movably connected to the base 1 on the side away from the fixing mechanism 4. The fixing mechanism 4 includes a fixing plate 401 provided at the first end of the base 1. The fixing plate 401 is provided with a radial top cone 402 at the end near the base 1.

[0038] The wire raising mechanism 3 includes a wire raising gantry 301, on which a detachable wire raising structure is provided. The wire raising structure includes a wire raising cylinder 305 detachably connected to the wire raising gantry 301. A pressing column 302 is provided inside the wire raising cylinder 305. The pressing column 302 is connected to the wire raising device 307 located at the bottom end of the wire raising cylinder 305 through a crank connecting rod 306.

[0039] The wire starter 307 includes a wire starter drive shaft 313 sleeved in the bottom end of the wire starter 305. The top end of the wire starter drive shaft 313 is connected to the inner cavity of the wire starter 305 through a wire starter spring 323. The crank connecting rod 306 includes a pressing connecting rod 319 rotatably connected to the pressing column 302. The movable end of the pressing connecting rod 319 is rotatably connected to the wire starter component provided on the wire starter drive shaft 313 through a connecting rod shaft 318.

[0040] The starting component includes a starting rod 317 rotatably connected to a pressing rod 319. A starting movable rod 316 is connected to one end of the starting rod 317 away from the pressing rod 319. A starting needle 315 is connected to the end of the starting movable rod 316, and the starting needle 315 is provided with barbs 325. The starting drive shaft 313 includes a pair of semi-circular drive plates 324 connected by a starting shaft 312. A starting gap 311 is provided between the semi-circular drive plates 324, and a fiber groove 314 is provided at the bottom end of each semi-circular drive plate 324. The starting shaft 312 is rotatably connected to a crank starting hole located at the connection between the starting rod 317 and the starting movable rod 316.

[0041] A pressing spring 304, connected to the wire-raising cylinder 305, is fitted onto the pressing column 302. The top end of the pressing spring 304 is connected to the pressing plate 303 located at the top of the pressing column 302. A pressing through hole 322 is provided on the side of the pressing column 302, and a pressing shaft 320, rotatably connected to the pressing connecting rod 319, is provided inside the pressing through hole 322. The pressing through hole 322 corresponds to the wire-raising through hole 310 penetrating the side of the wire-raising cylinder 305, and the wire-raising through hole 310 corresponds to the wire-raising gap 311. The wire-raising drive shaft 313 is an inverted frustum type.

[0042] The wire-starting spool 305 engages with the wire-starting hole 308 of the gantry frame 301. The top of the wire-starting spool 305 is provided with detachable wire-starting baffles 309 on both sides. The wire-starting baffles 309 engage with the baffle slots on both sides of the wire-starting hole 308 of the gantry frame.

[0043] A V-shaped groove 6 parallel to the long side of the base 1 is provided on the axis of symmetry of the base 1, and T-shaped guide grooves 5 are symmetrically arranged on both sides of the V-shaped groove 6; the radial top cone 402 extends into the V-shaped groove 6.

[0044] The take-up mechanism 2 includes a take-up gantry 201, a take-up roller 204 inside the take-up gantry 201, a take-up roller shaft 207 on the axis of the take-up roller 204, and spring plates 202 connected to both ends of the take-up roller shaft 207. A pre-tightening compression spring 203 connected to the top plate of the take-up gantry 201 is provided on the top surface of the spring plate 202. Vertical guide grooves 206 that engage with the ends of the spring plates 202 are provided on the inner walls of both side plates of the take-up gantry 201. Inverted T-shaped sliding plates 205 that engage with T-shaped guide grooves 5 are provided at both bottom ends of the take-up gantry 201. An adhesive layer is applied to the surface of the take-up roller 204.

[0045] Working principle of the invention: The core working principle of the invention is to utilize the axial arrangement of the molecular chains of polytetrafluoroethylene oriented rods 7, and to achieve reliable fiber preparation through the method of "limited fiber raising + axial collection".

[0046] The operation steps of this invention are as follows: Step 1: Clamping the materials; First, the inverted T-shaped slide plate 205 of the take-up gantry 201 is removed from the T-shaped guide groove 5, thereby removing the take-up mechanism 2 as a whole. The polytetrafluoroethylene oriented rod 7 is placed along the V-shaped groove 6, with one end fixed by the fixing mechanism 4 at the head end of the base 1. The first end of the rod abuts against the radial top cone 402 on the side of the fixing plate 401 of the fixing mechanism 4 to complete axial positioning. Then, the take-up mechanism 2 is reinstalled into the T-shaped guide groove 5. The pre-tight compression springs 203 on both sides of the take-up mechanism 2 automatically apply normal pressure to the spring plate 202, so that the surface of the take-up roller 204 is in close contact with the outer cylindrical surface of the polytetrafluoroethylene oriented rod 7. The take-up mechanism 2 is pushed to the deepest part of the T-shaped guide groove 5 to complete the material clamping.

[0047] Step 2: Pressing and stringing; The pressing plate 303 presses the pressing column 302 on the starting gantry 301 of the starting mechanism 3. The pressing column 302 moves downward along the inner cavity of the starting cylinder 305 in the starting hole 308 of the gantry. The pressing column 302 drives the starting device 307 through the crank connecting rod 306. The starting device 307 will gradually descend until it is attached to the surface of the rod-shaped material. Some material will be squeezed into the fiber groove 314 at the bottom of the starting device 307. The starting baffle 309 prevents the starting cylinder 305 from shaking. As the pressing column 302 continues to press down, the pressing column 302 pushes one end of the pressing connecting rod 319 through the pressing shaft 320 in the pressing through hole 322 to move downward synchronously in the starting through hole 310. The other end of the pressing connecting rod 319 pushes the starting connecting rod 317 to extend in an oblique downward direction through the connecting rod rotating hole 321 and the connecting rod rotating shaft 318. Under the action of 312, the starting spring 323 in the starting device 307 stores energy. The starting rod 316 and the starting needle 315 at the end extend obliquely through the starting gap 311 along with the starting connecting rod 317. The crank connecting rod 306 converts the linear motion of the pressing column 302 into the rotational potential energy of the starting needle 315, driving the starting needle 315 to accurately pierce the surface of the polytetrafluoroethylene oriented rod 7 in the fiber groove 314 along the tangential direction. The barb 325 hooks into the target fiber bundle to complete the hooking. The pressing column 302 is released, and the starting spring 323 releases potential energy to drive the pressing column 302 to move upward and the starting drive shaft 313 to reset. At the same time, the pressing spring 304 pushes the pressing column 302 to reset. The barb on the starting needle 315 hooks the fiber bundle above the piercing point and hooks it away from the polytetrafluoroethylene oriented rod 7. This process is called starting.

[0048] Step 3: Gather the yarn; During the upward reset process, the PTFE monofilament hooked by the take-up mechanism 3 comes into contact with the adhesive layer on the surface of the take-up roller 204 and is instantly adhered, completing the initial fixation of the fiber. Subsequently, the take-up structure is manually driven to make axial translational movement along the T-shaped guide groove 5 of the base 1. Utilizing the static friction generated by the positive pressure between the take-up roller and the PTFE oriented rod 7, the take-up roller 204 rolls along the take-up roller shaft 207 on the surface of the PTFE oriented rod 7. The rotational movement of the take-up roller 204 continuously winds the fixed monofilament around the roller. On the surface of the body, the PTFE monofilament fibers are continuously peeled from the surface of the PTFE oriented rod 7 with the help of stable winding tension, and finally the automated continuous collection of monofilament fibers is completed. During the winding process, the pre-tight compression spring 203 drives the winding roller 204 to continuously adhere to the surface of the PTFE oriented rod 7 along the vertical guide groove 206 through the T-shaped guide plates 208 at both ends of the spring plate 202. This can prevent the PTFE oriented rod 7 from rotating while maintaining the automatic winding of the winding roller 204.

[0049] Step 4: Process layer by layer in a cyclical manner; When the take-up mechanism 2 completes one stroke, for example, from one end of the PTFE oriented rod 7 to the other, the complete peeling process of a single continuous filament is completed. At this time, a layer of material is removed from the surface of the PTFE oriented rod 7, and the diameter of the rod is reduced accordingly. The operator pulls the take-up mechanism 2 back to the starting end. Due to the effect of the fiber groove 314, when the filament is taken up again, the end face of the take-up drive shaft 313 will once again precisely fit the PTFE oriented rod 7, ensuring that the piercing depth of the piercing hook remains constant. Therefore, the diameter of the hooked filament is consistent with the previous one, and the continuous peeling of the next layer of fiber can be started directly without additional adjustment of the device parameters, so as to achieve uniform filament taking layer by layer.

[0050] This process is repeated, and the polytetrafluoroethylene oriented rod 7 is peeled off layer by layer from the surface to the core; each peeling yields a continuous long filament fiber; the above pressing and winding steps are repeated, and the process is repeated layer by layer until the entire polytetrafluoroethylene oriented rod 7 is finally processed into several long filament fibers, leaving only a very fine core or completely consumed, resulting in extremely high material utilization; in this embodiment, the barb 325 can be a unidirectional bending needle similar to a fishhook. Example 2

[0051] A fiber preparation apparatus for polytetrafluoroethylene oriented rods differs from Example 1 in that: the surface of the take-up roller 204 is coated with a 0.5 mm thick silicone adhesive layer for initial adsorption of fiber ends. Example 3

[0052] A fiber preparation apparatus for polytetrafluoroethylene oriented rods differs from that in Example 1 in that: the fiber-raising drive shaft 313 has a detachable structure, and the fiber grooves 314 on the semi-circular drive plate 324 in different fiber-raising drive shafts 313 have different opening widths; the fiber-raising needles 315 have a detachable structure via a threaded connecting rod and a fiber-raising movable rod 316, and different fiber-raising needles 315 are provided with barbs 325 of different heights; and a fiber-raising limit block is provided inside the fiber-raising cylinder 305 to adjust the range of motion of the fiber-raising drive shaft 313. Example 4

[0053] A fiber preparation apparatus for polytetrafluoroethylene oriented rods differs from that in Example 1 in that: a scale is provided on the fiber groove 314, and limiting grooves are provided on both sides of the fiber groove 314, with replaceable groove limiting plates provided in the limiting grooves. Example 5

[0054] A fiber preparation apparatus for polytetrafluoroethylene oriented rods, which differs from Example 1 in that: the base 1 includes at least one detachable base plate. Example 6

[0055] A fiber preparation apparatus for polytetrafluoroethylene oriented rods differs from that in Example 1 in that the included angle between the filament-raising movable rod 316 and the filament-raising connecting rod 317 is 30-180°; and the included angle between the filament-raising needle 315 and the filament-raising movable rod 316 is 30-180°. Example 7

[0056] A fiber preparation apparatus for polytetrafluoroethylene oriented rods differs from that in Example 1 in that: the starting rod 316 is perpendicular to the starting connecting rod 317; and the starting needle 315 is perpendicular to the starting rod 316.

[0057] The above description is only a preferred embodiment of the present invention, but is not limited to the above examples. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fiber preparation apparatus for polytetrafluoroethylene oriented rods, characterized in that, The device includes a base, and a fixing mechanism is provided at the first end of the base. The fixing mechanism cooperates with a wire-raising mechanism provided on the base. A wire-raising mechanism is provided on the side of the wire-raising mechanism away from the fixing mechanism and is movably connected to the base. The fixing mechanism includes a fixing plate provided at the first end of the base, and a radial top cone is provided at the end of the fixing plate near the base.

2. The fiber preparation apparatus for polytetrafluoroethylene oriented rods according to claim 1, characterized in that, The wire raising mechanism includes a wire raising gantry frame, on which a detachable wire raising structure is provided. The wire raising structure includes a wire raising cylinder detachably connected to the wire raising gantry frame. A pressing column is provided inside the wire raising cylinder, and the pressing column is connected to a wire raiser located at the bottom end of the wire raising cylinder through a crank connecting rod.

3. The fiber preparation apparatus for polytetrafluoroethylene oriented rods according to claim 2, characterized in that, The wire feeder includes a wire feed drive shaft sleeved inside the bottom end of the wire feed cylinder, and the top end of the wire feed drive shaft is connected to the inner cavity of the wire feed cylinder through a wire feed spring; the crank connecting rod includes a pressing connecting rod rotatably connected to the pressing column, and the movable end of the pressing connecting rod is rotatably connected to the wire feed component disposed on the wire feed drive shaft.

4. The fiber preparation apparatus for polytetrafluoroethylene oriented rods according to claim 3, characterized in that, The wire-raising component includes a wire-raising connecting rod rotatably connected to the pressing connecting rod. A wire-raising movable rod is connected to one end of the wire-raising connecting rod away from the pressing connecting rod. A wire-raising needle is connected to the end of the wire-raising movable rod, and the wire-raising needle is provided with barbs.

5. The fiber preparation apparatus for polytetrafluoroethylene oriented rods according to claim 4, characterized in that, The fiber-starting drive shaft includes a pair of semi-circular drive plates connected by a fiber-starting rotating shaft. A fiber-starting gap is provided between the semi-circular drive plates, and a fiber groove is provided at the bottom end of the semi-circular drive plates. The fiber-starting rotating shaft is rotatably connected to a crank fiber-starting hole located at the connection between the fiber-starting connecting rod and the fiber-starting movable rod.

6. The fiber preparation apparatus for polytetrafluoroethylene oriented rods according to claim 5, characterized in that, The pressing column is fitted with a pressing spring that is connected to the wire-raising cylinder. The top end of the pressing spring is connected to the pressing plate set at the top of the pressing column. The side of the pressing column is provided with a pressing through hole, and a pressing shaft that is rotatably connected to the pressing connecting rod is provided in the pressing through hole.

7. The fiber preparation apparatus for polytetrafluoroethylene oriented rods according to claim 6, characterized in that, The pressing through hole corresponds to the wire raising through hole penetrating the side of the wire raising cylinder, and the wire raising through hole corresponds to the wire raising gap; the wire raising drive shaft is an inverted frustum type.

8. The fiber preparation apparatus for polytetrafluoroethylene oriented rods according to claim 2, characterized in that, The wire-starting spool engages with the wire-starting hole of the gantry frame. The top of the wire-starting spool is provided with detachable wire-starting baffles on both sides, which engage with the baffle slots on both sides of the wire-starting hole of the gantry frame.

9. The fiber preparation apparatus for polytetrafluoroethylene oriented rods according to claim 1, characterized in that, The base has a V-shaped groove on its axis of symmetry, which is parallel to the direction of the long side of the base. T-shaped guide grooves are symmetrically arranged on both sides of the V-shaped groove. The radial top cone extends into the V-shaped groove.

10. The fiber preparation apparatus for polytetrafluoroethylene oriented rods according to claim 9, characterized in that, The take-up mechanism includes a take-up gantry frame, inside which is a take-up roller. A take-up roller shaft is located at the center of the take-up roller shaft, and spring plates are connected to both ends of the take-up roller shaft. A pre-tightening compression spring is provided on the top surface of the spring plate and connected to the top plate of the take-up gantry frame. Vertical guide grooves that engage with the ends of the spring plates are provided on the inner walls of both side plates of the take-up gantry frame. Inverted T-shaped sliding plates that engage with the T-shaped guide grooves are provided at both bottom ends of the take-up gantry frame. An adhesive layer is applied to the surface of the take-up roller.

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