A testing device and testing process for the strength of synthetic fiber precursor yarns

Abstract

This invention discloses a chemical fiber filament strength testing device and its testing process, comprising a base, a winding unit disposed on one side of the base, and a stretching unit disposed on the other side of the base; the winding unit includes a motor, a winding frame, and a pusher slidably disposed on the winding frame; the stretching unit includes a positioning frame and a sliding frame, and the base is provided with a linear module for driving the sliding frame to move relative to the positioning frame; the motor includes an output shaft cooperating with the winding frame and a lead screw connected to the output shaft, a one-way bearing is provided between the winding frame and the output shaft, and a nut cooperating with the lead screw is provided on the pusher; the output shaft can switch between forward and reverse rotation to realize synchronous rotation of the winding frame and the pusher or to allow the pusher to move laterally relative to the winding frame to push the filament roll onto the stretching unit; this invention mainly solves the problems of dangerous manual operation, inaccurate winding coil count, and low efficiency caused by process separation in the prior art.

Description

Technical Field

[0001] This invention relates to the field of chemical fiber testing equipment technology, and in particular to a chemical fiber raw yarn strength testing equipment and its testing process. Background Technology

[0002] Synthetic fiber precursor is the basic raw material for the production of chemical fibers. Its mechanical properties, especially its extensibility (elongation at break), are key indicators for evaluating fiber quality and determining its subsequent processing and application range. Currently, the commonly used testing method in the industry is to stretch the fiber bundle to break through a tensile test to obtain its maximum elongation.

[0003] Existing testing procedures typically consist of two separate stages: manual wire drawing and bundling, and equipment tensile testing.

[0004] Firstly, in the wire drawing and bundling stage, operators must manually draw the raw materials while they are in a molten state at high temperatures, and then wind the drawn wires into small bundles with a specific number of turns. This method has significant drawbacks: Firstly, the molten raw materials pose a risk of burns to operators, making labor protection requirements extremely stringent; secondly, relying on manual control of the number of turns introduces significant measurement errors and subjectivity, resulting in inconsistencies in the length and number of turns of the final bundled wires, directly affecting the accuracy and repeatability of subsequent tensile test data.

[0005] Subsequently, during the tensile testing phase, the manually wound bundles of filaments need to be transferred from the drawing station to a dedicated tensile testing device. This transfer process not only adds extra steps and reduces overall testing efficiency, but also may cause the filaments to become disordered, accidentally stretched, or contaminated during transfer, further introducing testing errors and making it difficult to guarantee the objectivity and authenticity of the test results. Summary of the Invention

[0006] This invention addresses the shortcomings of existing technologies by providing a chemical fiber filament strength testing device and its testing process, mainly solving problems such as dangerous manual operation, inaccurate winding coil count, and low efficiency caused by process separation in existing technologies.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a chemical fiber filament strength testing device, comprising a base, a winding unit disposed on one side of the base, and a stretching unit disposed on the other side of the base;

[0008] The winding unit includes a motor, a winding frame, and a pusher that is slidably mounted on the winding frame;

[0009] The stretching unit includes a positioning frame and a second sliding frame, and the base is provided with a linear module for driving the second sliding frame to move relative to the positioning frame;

[0010] The motor includes an output shaft that cooperates with a winding frame and a lead screw connected to the output shaft. A one-way bearing is provided between the winding frame and the output shaft, and a nut that cooperates with the lead screw is provided on the push frame.

[0011] The output shaft can switch between forward and reverse rotation to achieve synchronous rotation of the winding frame and the pusher frame, or to allow the pusher frame to move laterally relative to the winding frame to push the wire roll onto the stretching unit.

[0012] In the above scheme, preferably, the winding frame includes a plurality of winding rods arranged around the circumference, and the push frame is provided with a guide plate that cooperates with the winding rods.

[0013] In the above scheme, preferably, the guide plate is provided with a guide groove that cooperates with the winding screw.

[0014] In the above scheme, preferably, any of the winding rods is rotatably mounted on a winding frame, which has a plurality of contact teeth that can contact the molten material. The other end of the winding rod is provided with a drive gear, which drives the winding rod to rotate so as to achieve contact or non-disengagement between the contact teeth and the molten material.

[0015] In the above scheme, preferably, the winding unit includes a first sliding frame for fixing the motor, the first sliding frame is provided with a drive rack that cooperates with the drive gear, and a return torsion spring is provided between the drive gear and the winding frame.

[0016] In the above scheme, preferably, the first sliding frame is provided with a drive push rod connected to the drive rack.

[0017] In the above scheme, preferably, the drive gear is provided with a limiting pin, and the winding frame is provided with a limiting plate that cooperates with the limiting pin.

[0018] In the above scheme, preferably, the first sliding frame is slidably mounted on the base via symmetrically arranged guide rails, the tensioning unit includes a fixed frame, and the lead screw guide passes through the fixed frame;

[0019] The fixed frame is provided with a meshing assembly that cooperates with the lead screw. The meshing assembly includes a meshing push rod and a meshing block. The meshing block is provided with a thread that cooperates with the lead screw.

[0020] The pusher is equipped with an inductive switch that works in conjunction with the fixed frame.

[0021] In the above scheme, preferably, both the positioning frame and the second sliding frame are provided with an extension plate placed within the circumference of the winding frame, and a pressure sensor is provided on any of the extension plates. The end of the extension plate is provided with a stop plate extending away from the center of the lead screw.

[0022] In the above scheme, a preferred method for testing the strength of chemical fiber precursor fibers is as follows:

[0023] S1: The motor rotates and drives the winding frame to rotate through the one-way bearing. The pusher and the winding frame rotate synchronously. The molten chemical fiber raw material is dipped into any winding rod and then drawn into fibers. As the number of turns of the winding frame increases, the chemical fiber is wound onto the winding frame.

[0024] S2: The motor records the number of rotations of the winding frame. When the number of rotations reaches the target, the motor stops rotating and the output shaft rotates in the opposite direction. At this time, the output shaft rotates relative to the winding frame through the one-way bearing, that is, the winding frame is in a stationary state. After the lead screw reverses with the output shaft, it drives the push frame to slide relative to the winding frame.

[0025] S3: The pusher pushes the chemical fiber raw filaments wound on the winding rod of the winding frame to the side closer to the stretching unit through the guide plate and guide groove;

[0026] S4: The pusher continues to drive the chemical fiber filaments to the positioning frame and the second sliding frame of the stretching unit. At this time, the chemical fiber filaments are bundled and sleeved on the positioning frame and the second sliding frame.

[0027] S5: The second sliding frame is driven to slide relative to the positioning frame by the linear module until the chemical fiber filament bundle breaks. The tensile strength of the chemical fiber filament is measured by the displacement distance of the linear module.

[0028] The beneficial effects of this invention are: by realizing full automation of the process from dipping molten raw materials and automatic wire winding to pushing to the stretching station, this invention completely avoids direct contact between operators and high-temperature molten materials, and significantly improves production safety.

[0029] Meanwhile, the use of a motor to precisely control the number of wire turns, combined with a linear module for precision stretching, ensures the consistency of each test sample, making the measurement results accurate, reliable, and highly repeatable.

[0030] In addition, the equipment integrates wire winding and tensile testing functions, eliminating intermediate transfer links and greatly improving testing efficiency. By using a combination of one-way bearings and lead screw and nut pairs, the wire winding and pushing modes can be switched easily and reliably by rotating the motor forward and reverse. The flip-out contact tooth design effectively takes into account the functional requirements of dipping raw materials and smooth wire winding. The overall structure is stable and the control logic is simple. Attached Figure Description

[0031] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0032] Figure 2 For the present invention Figure 1 A magnified schematic diagram of the structure at point A in the middle.

[0033] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0034] Figure 4 This is a schematic diagram of the working structure of the winding frame and pusher frame of the present invention.

[0035] Figure 5 This is a schematic diagram of the three-dimensional structure of the pusher frame of the present invention.

[0036] Figure 6 For the present invention Figure 3 A magnified schematic diagram of the structure at point B in the middle. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments: See below Figures 1-6 .

[0038] A chemical fiber filament strength testing device includes a base 1, a winding unit 2 disposed on one side of the base 1, and a tensioning unit 3 disposed on the other side of the base 1. The winding unit 2 includes a motor 201, a winding frame 202, and a pusher 203 slidably disposed on the winding frame 202.

[0039] The motor 201 is a servo geared motor, which is connected to a PLC controller. The speed and number of revolutions can be controlled by the PLC controller. The motor 201 is equipped with an output shaft 204. The winding frame 202 is connected to the output shaft 204 through a one-way bearing 206. That is, when the output shaft 204 moves along... Figure 1 Taking the right-hand view as an example, when the direction shown is rotated clockwise, the output shaft 204 drives the winding frame 202 to rotate synchronously through the limiting of the one-way bearing 206. When the output shaft 204 rotates in reverse, the output shaft 204 rotates relative to the center of the winding frame 202, that is, the winding frame 202 can be in a stationary state.

[0040] The winding frame 202 includes a frame body and a plurality of winding rods 208 arranged perpendicularly to the frame body and evenly distributed around the circumference of the frame body, such as Figure 1 and Figure 4 As shown, in this embodiment, taking the setting of 4 sets of winding rods 208 as an example, a hot melt groove can be set on the base 1, which can place the chemical fiber raw material in the hot melt groove for hot melting. After the outer wall of any winding rod 208 dips into the chemical fiber raw material in the hot melt groove, the chemical fiber filament can be pulled out. Then, by rotating the winding frame 202, the chemical fiber filament is wound on the winding frame 202. Preferably, the hot melt groove is set at the bottom of the winding rod 208 along the length direction, and a lifting mechanism can be configured to achieve contact between the outer wall of the winding rod 208 and the chemical fiber raw material in the hot melt groove.

[0041] To achieve better material pick-up by the winding rod 208, in this embodiment, any winding rod 208 is rotatably mounted on the winding frame 202. A plurality of contact teeth 211 are equidistantly arranged on the outer wall of the end away from the motor 201. A guide plate 209 on the push frame 203, corresponding to the winding rod 208, has a through slot for the contact teeth 211 to pass through. The end closer to the motor 201 is rotatably mounted on the winding frame 202 and then fixed with a drive gear 212. The drive gear 212, by reciprocating 180 degrees, can position the contact teeth 211 at either the end away from or close to the center of the output shaft 204; thereby achieving contact or non-disengagement between the contact teeth 211 and the molten material.

[0042] The drive gear 212 is provided with a limiting pin 213, such as Figure 2 and Figure 6 As shown, the limiting pin 213 is fixed on the end face of the drive gear 212 facing the winding frame 202. A limiting plate 214 that cooperates with the limiting pin 213 is fixed on the winding frame 202. A return torsion spring is provided between the drive gear 212 and the winding frame 202. Initially, the contact tooth 211 is on the side facing the center of the output shaft 204, and the limiting pin 213 abuts against the limiting plate 214, maintaining this state under the elastic force of the return torsion spring. When the drive gear 212 rotates 180°, the limiting pin 213 moves away from the limiting plate 214, forming... Figure 2 In the state shown, the elastic force of the return torsion spring is overcome by the external force of the rotation of the drive gear 212, causing the contact teeth 211 to rotate 180° around the lead screw 208 and form a... Figure 3 The state shown is towards the end away from the output shaft 204. After the external force on the drive gear 212 disappears, it is reset by the reset torsion spring to the state where the contact teeth 211 face the end of the output shaft 204.

[0043] The first sliding frame 4 is provided with a drive rack 401 that cooperates with the drive gear 212. The drive rack 401 is an arc-shaped rack that is concentrically arranged around the circumference of the wire frame 202. The first sliding frame 4 is provided with a drive push rod 402 connected to the drive rack 401. When the drive push rod 402 pushes the drive rack 401 into the push-out state, the drive gear 212 rotates after the wire frame 202 rotates. After it contacts and meshes with the drive rack 401, the drive gear 212 rolls relative to the drive rack 401, thereby realizing the rotation of the drive gear 212. Preferably, the meshing length between the drive rack 401 and the drive gear 212 is half the circumference of the pitch circle diameter of the drive gear 212. That is, after the drive gear 212 rolls relative to the drive rack 401, the drive gear 212 can drive the wire rod 208 connected to it to rotate 180°.

[0044] Furthermore, let the winding frame 202 along... Figure 2When the motor 201 rotates clockwise from the right side view, the drive rack 401 is pushed out by the drive push rod 402. At this time, when the drive gear 212 passes the drive rack 401, the drive gear 212 can rotate 180°, and the meshing end point of the drive rack 402 is at the lowest point of the circumference of the winding frame 202. That is, at this time, the contact teeth 211 that cooperate with the drive gear 212 are in a vertically downward state, and can contact the chemical fiber raw material in the hot melt tank below. When the winding frame 202 rotates counterclockwise, after the drive gear 212 and the drive rack 402 make reverse contact, the limit pin 213 and the limit plate 214 limit the drive gear 212 to be relatively fixed in this position, while the output shaft 204 can rotate relative to the center of the winding frame 202 through the one-way bearing 206.

[0045] A lead screw 205 is fixedly mounted on the end of the output shaft 204 away from the motor 201. A nut 207 that mates with the lead screw 205 is provided on the push frame 203. A guide plate 209 that mates with the winding lead screw 208 is also provided on the push frame 203. The guide plate 209 has a guide groove 210 that mates with the winding lead screw 208. When the output shaft 204 rotates relative to the center of the winding frame 202 via the one-way bearing 206, the lead screw 205 rotates synchronously. Through its interaction with the nut 207, the push frame 203 moves along... Figure 1 Slide to the left in the indicated direction to push the chemical fiber bundle wound on the winding rod 208 to the left, and push all the raw filaments on the winding rod 208 to the left side through the locking and limiting of the guide groove 210; that is, the output shaft 204 switches between forward and reverse to realize the synchronous rotation of the winding frame 202 and the push frame 203 or the push frame 203 moves laterally relative to the winding frame 202 to push the filament roll onto the stretching unit 3.

[0046] In this embodiment, in order to push the wound chemical fiber bundle onto the stretching unit 3 for a tensile test, the stretching unit 3 includes a positioning frame 301 and a second sliding frame 302. A fixing frame 304 is vertically arranged on the base 1. A linear module 303 for driving the second sliding frame 302 to move relative to the positioning frame 301 is vertically arranged on the fixing frame 304. That is, the second sliding frame 302 is fixed on the slider of the linear module 303.

[0047] The first sliding frame 4 is slidably mounted on the base 1 via symmetrically arranged guide rails 5. The lead screw 205 is guided through the fixing frame 304. The fixing frame 304 is provided with a meshing assembly 6 that cooperates with the lead screw 205. The meshing assembly 6 includes a meshing push rod 601 and a meshing block 602. The meshing block 602 is provided with a thread that cooperates with the lead screw 205. The push frame 203 is provided with a sensor switch 215 that cooperates with the fixing frame 304. 5. The PLC controller is connected to the meshing push rod 601. When the push frame 203 is driven to slide to the left by the lead screw 205, the chemical fiber filament is pushed to the left into a bundle shape. When the induction switch 215 senses that it is close to the fixed frame 304, it drives the meshing push rod 601 to start, so that the meshing block 602 meshes with the lead screw 205. At this time, the lead screw 205 rotates, causing the first sliding frame 4 to move away from the fixed frame 304 as a whole. At the same time, the push frame 203 continues to slide to the left, pushing the chemical fiber filament bundle onto the stretching unit 3.

[0048] Both the positioning frame 301 and the second sliding frame 302 are provided with an extension plate 305 placed within the circumference of the winding frame 202, such as Figure 3 As shown, a pressure sensor 306 is provided on any of the extension plates 305. A stop plate 307 extending away from the center of the lead screw 205 is provided at the end of the extension plate 305. The chemical fiber bundle pushed out by the pusher 203 is pushed onto the extension plate 305 of the second sliding frame 302, and the lower end is fitted with the extension plate 305 of the positioning frame 301. Then, the linear module 303 is started, and the second sliding frame 302 is moved upward to the positioning frame 301. The pressure sensor 306 senses the pressure when the chemical fiber bundle is stretched. When the pressure sensor 306 disappears or drops rapidly after being stretched to a certain extent, it indicates that the bundle has completed the stretching test. At this time, the displacement distance of the linear module 303 is measured by the PLC controller, and the data of each group is further analyzed.

[0049] In this embodiment, the motor 201, linear module 303, drive push rod 402, pressure sensor 306, inductive switch 215, and engagement push rod 601 are all connected to the PLC controller, thereby realizing the automated control of the entire testing equipment and improving testing efficiency.

[0050] The workflow of using a chemical fiber raw material strength testing device as described above:

[0051] Initial preparation and raw material dipping: The equipment starts, and the drive push rod 402 actuates, pushing out the drive rack 401. The motor 201 rotates clockwise, driving the winding frame 202 to rotate via the one-way bearing 206. When the winding rod 208 equipped with contact teeth 211 rotates to mesh with the drive rack 401, the drive gear 212 is driven to rotate 180°, causing the contact teeth 211 to flip to a vertically downward position. When the winding rod 208 rotates to the downward position, its contact teeth 211 are immersed in the hot melt bath to dip into the molten chemical fiber raw material, and are drawn into fibers as the winding frame 202 continues to rotate; subsequently, the drive push rod 402 resets, causing the contact teeth 211 to return to the end facing the center of the output shaft 204;

[0052] Automatic winding: The motor 201 rotates continuously in the forward direction, driving the winding frame 202 and the pusher 203, which is connected to the nut 207 via the lead screw 205, to rotate synchronously. The pulled-out chemical fiber filaments are continuously and neatly wound onto multiple winding screws 208. The encoder built into the motor 201 or the connected PLC controller accurately counts the number of winding turns.

[0053] Switching to wire push mode: When the number of coils reached the preset value, motor 201 stops and then reverses (counter-clockwise). At this time, drive push rod 402 pushes drive rack 401 out again, one-way bearing 206 disengages, output shaft 204 spins freely, and wire winding frame 202 can be kept stationary by the reverse limit of drive rack 401. The reverse-rotating output shaft 204 drives lead screw 205 to rotate.

[0054] Unwinding the coil: The rotating lead screw 205, in conjunction with the nut 207, drives the pusher 203 to move axially to the left. The guide plate 209 and guide groove 210 on the pusher 203 slide along the lead screw 208, smoothly unwinding the coiled wire from the lead screw 208.

[0055] Silk roll transfer and positioning: The pusher 203 continuously moves to the left, pushing the silk roll toward the stretching unit 3. When the inductive switch 215 on the pusher 203 detects proximity to the fixed frame 304, the PLC controller triggers the engagement push rod 601 to engage the engagement block 602 with the lead screw 205. This engagement force pushes the entire first sliding frame 4 to the right along the guide rail 5, causing the end of the winding lead screw 208 to move slightly away from the extension plate 305 of the positioning frame 301, ensuring that the silk roll is accurately pushed and fitted onto the extension plate 305 of the positioning frame 301 and the second sliding frame 302, and is prevented from falling off by the stop plate 307.

[0056] Tensile strength test: The linear module 303 is activated, driving the second sliding frame 302 to move upward, stretching the chemical fiber filament bundle fitted on the two extension plates 305. The pressure sensor 306 monitors the tensile force in real time, and the displacement sensor of the linear module 303 records the stretched length. When the filament bundle breaks, the reading of the pressure sensor 306 drops sharply. The PLC controller records the maximum tensile force and displacement data at the time of breakage and calculates the tensile strength of the chemical fiber filament accordingly.

[0057] Equipment Reset: After the test is completed, all moving parts such as linear module 303, motor 201, and drive push rod 402 are reset to prepare for the next test cycle.

[0058] A testing process for testing the strength of synthetic fiber precursor fibers is described below:

[0059] S1: The rotation of motor 201 drives the winding frame 202 to rotate through one-way bearing 206, and push frame 203 rotates synchronously with winding frame 202. The molten chemical fiber raw material is dipped into any winding rod 208 and then drawn into fibers. As the number of turns of winding frame 202 increases, the chemical fiber raw material is wound on winding frame 202.

[0060] S2: Motor 201 records the number of rotations of winding frame 202. When the number of rotations reaches the target, motor 201 stops rotating and causes output shaft 204 to rotate in the opposite direction. At this time, output shaft 204 rotates relative to winding frame 202 through one-way bearing 206, that is, winding frame 202 is in a stationary state. After the lead screw 205 rotates in the opposite direction with output shaft 204, it drives push frame 203 to slide relative to winding frame 202.

[0061] S3: The pusher 203 pushes the chemical fiber raw filaments wound on the winding rod 208 of the winding frame 202 to the side closer to the stretching unit 3 through the guide plate 209 and the guide groove 210;

[0062] S4: The pusher 203 continues to drive and pushes the chemical fiber filaments onto the positioning frame 301 and the second sliding frame 302 of the stretching unit 3. At this time, the chemical fiber filaments form a bundle and are sleeved on the positioning frame 301 and the second sliding frame 302.

[0063] S5: The second sliding frame 302 is driven to slide relative to the positioning frame 301 by the linear module 303 until the chemical fiber filament bundle breaks. The tensile strength of the chemical fiber filament is measured by the displacement distance of the linear module 303.

[0064] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for testing the strength of synthetic fiber precursor yarns, characterized in that: It includes a base (1), a winding unit (2) located on one side of the base (1), and a stretching unit (3) located on the other side of the base (1). The winding unit (2) includes a motor (201), a winding frame (202), and a pusher (203) that is slidably mounted on the winding frame (202). The stretching unit (3) includes a positioning frame (301) and a second sliding frame (302). The base (1) is provided with a linear module (303) for driving the second sliding frame (302) to move relative to the positioning frame (301). The motor (201) includes an output shaft (204) that cooperates with the winding frame (202) and a lead screw (205) connected to the output shaft (204). A one-way bearing (206) is provided between the winding frame (202) and the output shaft (204). A nut (207) that cooperates with the lead screw (205) is provided on the push frame (203). The output shaft (204) can switch between forward and reverse rotation to achieve synchronous rotation of the winding frame (202) and the push frame (203) or to allow the push frame (203) to move laterally relative to the winding frame (202) to push the wire roll onto the stretching unit (3); The first sliding frame (4) is slidably mounted on the base (1) via symmetrically arranged guide rails (5). The tensioning unit (3) includes a fixed frame (304), and the lead screw (205) is guided through the fixed frame (304). The fixing frame (304) is provided with a meshing assembly that cooperates with the lead screw (205). The meshing assembly (6) includes a meshing push rod (601) and a meshing block (602). The meshing block (602) is provided with a thread that cooperates with the lead screw (205). The pusher (203) is equipped with an induction switch (215) that cooperates with the fixed frame (304).

2. The chemical fiber filament strength testing device according to claim 1, characterized in that: The winding frame (202) includes a plurality of winding rods (208) arranged around the circumference, and the push frame (203) is provided with a guide plate (209) that cooperates with the winding rods (208).

3. The chemical fiber filament strength testing device according to claim 2, characterized in that: The guide plate (209) is provided with a guide groove (210) that cooperates with the winding screw (208).

4. The chemical fiber filament strength testing device according to claim 2, characterized in that: Any of the aforementioned winding rods (208) is rotatably mounted on the winding frame (202), and is provided with a plurality of contact teeth (211) that can contact the molten raw material. The other end of the winding rod (208) is provided with a drive gear (212), which drives the winding rod (208) to rotate so as to achieve contact or non-disengagement between the contact teeth (211) and the molten raw material.

5. The chemical fiber filament strength testing device according to claim 4, characterized in that: The winding unit (2) includes a first sliding frame (4) for fixing the motor (201), and the first sliding frame (4) is provided with a driving rack (401) that cooperates with the driving gear (212). A reset torsion spring is provided between the driving gear (212) and the winding frame (202).

6. The chemical fiber filament strength testing device according to claim 5, characterized in that: The first sliding frame (4) is provided with a drive push rod (402) connected to the drive rack (401).

7. The chemical fiber filament strength testing device according to claim 5, characterized in that: The drive gear (212) is provided with a limiting pin (213), and the winding frame (202) is provided with a limiting plate (214) that cooperates with the limiting pin (213).

8. The chemical fiber filament strength testing device according to claim 1, characterized in that: Both the positioning frame (301) and the second sliding frame (302) are provided with an extension plate (305) placed within the circumference of the winding frame (202). A pressure sensor (306) is provided on any of the extension plates (305). A stop plate (307) extending away from the center of the lead screw (205) is provided at the end of the extension plate (305).

9. The testing process for testing chemical fiber raw materials using the chemical fiber raw material strength testing equipment as described in claim 3, characterized in that: The process is as follows: S1: The motor (201) rotates and drives the winding frame (202) to rotate through the one-way bearing (206). The push frame (203) rotates synchronously with the winding frame (202). The molten chemical fiber raw material is dipped into any winding rod (208) and then drawn into fibers. As the number of turns of the winding frame (202) increases, the chemical fiber is wound on the winding frame (202). S2: The motor (201) records the number of rotations of the winding frame (202). When the number of rotations reaches the target, the motor (201) stops rotating and causes the output shaft (204) to rotate in the opposite direction. At this time, the output shaft (204) rotates relative to the winding frame (202) through the one-way bearing (206), that is, the winding frame (202) is in a stationary state. The lead screw (205) drives the push frame (203) to slide relative to the winding frame (202) after the output shaft (204) reverses. S3: The pusher (203) pushes the chemical fiber raw filaments wound on the winding rod (208) of the winding frame (202) to the side close to the stretching unit (3) through the guide plate (209) and guide groove (210); S4: The pusher (203) continues to drive and pushes the chemical fiber filaments onto the positioning frame (301) and the second sliding frame (302) of the stretching unit (3). At this time, the chemical fiber filaments form a bundle and are sleeved on the positioning frame (301) and the second sliding frame (302). S5: Drive the second sliding frame (302) to slide relative to the positioning frame (301) through the linear module (303) until the chemical fiber filament bundle breaks. The tensile strength of the chemical fiber filament is determined by the displacement distance of the linear module (303).

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