Tensile property testing device for bio-based material

Abstract

The invention relates to the technical field of bio-based detection, and discloses a bio-based material tensile property testing device which comprises a machine base, a protection mechanism is arranged at the top of the machine base, an L-shaped groove is formed in the top of the machine base, a sample cutting mechanism is arranged at the top of the machine base, and a two-way screw is rotationally connected to the bottom of the machine base; a detection mechanism is arranged on the outer circumferential surface of the two-way screw rod, a rotating handle is arranged on the left portion of the machine base, the sample cutting mechanism comprises a first screw rod, a second screw rod, an annular cutter, an inner annular cutter, a first spring, a cutter holder, a limiting rod, a dead knife and a lifting seat, the first screw rod is rotationally connected to the bottom of the machine base, and the second screw rod is rotationally connected to the inner surface of the bottom of the machine base. According to the invention, the loss of the sample piece is saved, the circular cutting shape can facilitate the fixation of the plastic piece in the subsequent stretching step, and the stretching form of the plastic piece can be seen more intuitively.

Description

Technical Field

[0001] This invention relates to the field of bio-based testing technology, specifically to a device for testing the tensile properties of bio-based materials. Background Technology

[0002] Bio-based certification is a certification of a product's bio-based content. It involves a third-party organization testing and evaluating the bio-based components in the product to ensure it meets specific bio-based standards. Bio-based certification helps consumers identify and choose environmentally friendly products, while also encouraging businesses to adopt more renewable resources and biotechnology to reduce negative environmental impacts.

[0003] The patent with announcement number CN115975359B specifically relates to a bio-based flame-retardant and biodegradable composition and its preparation method. The bio-based flame-retardant and biodegradable composition comprises the following raw materials: PCL resin, PLA resin, modified starch, bio-based flame retardant, compatibilizer, toughening agent, and antioxidant. Compared with the prior art, this invention utilizes the unique rod-shaped nanomaterials of bamboo cellulose microcrystals and prepares bamboo cellulose microcrystal-loaded phenyl phosphate-taurine (PHPA-PA) through a combination of surface modification and loading treatment, forming a highly efficient flame-retardant acid source. Simultaneously, by modifying the starch, the shortcomings of traditional starch, such as high viscosity, strong hydrophilicity, and easy gelatinization, are addressed. Using modified starch as a carbon source and bamboo cellulose microcrystal-loaded phenyl phosphate-taurine (PHPA-PA) as an acid source, combined with PCL, PLA resin, and other processing aids, a bio-based flame-retardant and biodegradable composition is developed. This solves the contradictory problem of poor flame-retardant performance of traditional bio-based materials and the non-renewable and non-degradable nature of flame retardants, thus broadening the application field of biodegradable materials. Although this patent solves the above problems, there is still the issue of excessive consumption and waste of test samples. Therefore, a bio-based material tensile property testing device is proposed to address the aforementioned problems. Summary of the Invention

[0004] The technical problem to be solved by this invention is to address the shortcomings of the prior art by providing a device for testing the tensile properties of bio-based materials. To solve the above technical problem, the technical solution adopted by this invention is as follows: A device for testing the tensile properties of bio-based materials includes a base, a protective mechanism on the top of the base, an L-shaped groove on the top of the base, a sample cutting mechanism on the top of the base, a bidirectional screw rotatably connected to the bottom of the base, a detection mechanism on the outer circumference of the bidirectional screw, a handle on the left side of the base, and the sample cutting mechanism includes a first screw, a second screw, a ring cutter, an inner ring cutter, a first spring, a cutter holder, a limiting rod, a bottom cutter, and a lifting seat. The first screw is rotatably connected to... At the bottom of the machine base, the second screw is rotatably connected to the inner surface of the bottom of the machine base, the blade holder is slidably connected to the outer circumferential surface of the second screw, the ring cutter is fixedly connected to the bottom of the blade holder, the inner ring cutter is slidably connected to the inside of the blade holder, one end of the first spring is fixedly connected to the bottom of the blade holder, the other end of the first spring is fixedly connected to the top of the inner ring cutter, the limiting rod is fixedly connected to the inner surface of the bottom of the machine base, the bottom blade is slidably connected to the top of the machine base, and the lifting seat is slidably connected to the inner wall of the bottom blade. The cutting mechanism also includes a slidable plate, a second spring, a sliding plate, and a lifting wheel. The slidable plate is slidably connected to the inner wall of the inner ring cutter, one end of the second spring is fixedly connected to the bottom of the inner ring cutter, and the other end of the second spring is fixedly connected to the inner surface of the machine base. The slide plate is fixedly connected to the bottom of the bottom blade, the lifting wheel is fixedly connected to the bottom of the lifting seat, the blade holder is slidably connected to the outer circumferential surface of the limiting rod, the slide plate is slidably connected to the inner wall of the L-shaped groove, the bidirectional screw is located on the movement trajectory of the lifting wheel, the top of the second screw is equipped with a motor, and the throttle is fixedly connected to the left side of the first screw. The plastic material to be tested is manually placed on the cutting mechanism. The cutting mechanism is started, causing the second screw to rotate and drive the blade holder downwards. The downward movement of the blade holder drives the ring cutter downwards, and the downward movement of the ring cutter drives the inner ring cutter downwards, simultaneously bringing the slide plate into contact with the plastic material to be tested. The blade holder continues to move downwards to process the plastic material. The cutting process cuts the plastic material into a hollow ring shape. After cutting, the motor reverses to drive the cutter head to rise, which in turn lifts the adhesive plate. As the adhesive plate rises, the internal waste material of the cut ring adheres to it and moves upward. The remaining outer waste material is then manually removed. At this point, only the ring-shaped part remains at the top of the lifting seat. Rotating the throttle then rotates the screw, which in turn moves the slide plate along the L-shaped groove, moving the lifting seat to the bottom of the stretching table. At this point, the lifting wheel contacts the bidirectional screw, causing the lifting seat to rise to the top of the feeding port. This eliminates the cost of manual cutting and greatly reduces sample loss. The ring-shaped cut facilitates the fixing of the plastic part in the subsequent stretching steps and allows for a more intuitive view of the stretched shape of the plastic part.

[0005] Preferably, the detection mechanism includes a pull base, a pull rod, a limiting hole, a limiting post, a pull table, a spring, a limiting groove, and a convex block. The pull base is slidably connected to the outer circumferential surface of the bidirectional screw. The pull rod is fixedly connected to the bottom of the pull base. The limiting hole is formed on the outer circumferential surface of the pull rod. The pull table is fixedly connected to the top of the base. The limiting groove is formed on the top of the pull table. The convex block is slidably connected to the inner wall of the limiting groove. One end of the spring is fixedly connected to the inner wall of the pull table, and the other end of the spring is fixedly connected to the front of the convex block. The limiting post is fixedly connected to the outer surface of the convex block. The detection mechanism also includes a gear, a screw, a rack, a feed port, and a reset block. The screw is rotatably connected to the top of the convex block. The gear is fixedly connected to the outer circumferential surface of the screw. The reset block is slidably connected to the outer circumferential surface of the screw. The rack is fixedly connected to the inner wall of the pull table. The feeding port is located on the outer circumference of the stretching table. The limiting post is located on the movement trajectory of the limiting hole, and the reset block is located on the movement trajectory of the pull rod. The gear meshes with the rack. When the cut plastic part moves to the bottom of the feeding port, the drive motor causes the bidirectional screw to rotate, driving the two pull seats to unfold outward along the limiting groove, pulling the plastic part outward. At the same time, the inner wall of the limiting hole is driven to contact the limiting post to limit the workpiece being tested, preventing the workpiece from detaching during the stretching process and affecting the testing efficiency. Subsequently, the bidirectional screw continues to drive the pull rod to move to both ends, driving the convex block to move. The movement of the convex block drives the top gear to mesh with the rack, causing the gear to rotate and thus driving the top screw to rotate. Under the limitation of the pull rod, the reset block moves downward to straighten the plastic part being stretched, preventing the guide lifting part from tilting horizontally during the stretching process and ensuring the standardization of the test data.

[0006] Preferably, the protection mechanism includes a glass cover, a hollow rod, a drive wheel, a screw rod, a connecting rod, and an elastic rod. The glass cover is fixedly connected to the top of the pull table, the connecting rod is fixedly connected to the outer wall of the pull table, the hollow rod is fixedly connected to the front part of the connecting rod, the screw rod is rotatably connected to the inner wall of the hollow rod, the drive wheel is fixedly connected to the right side of the screw rod, and the elastic rod is slidably connected to the outer circumferential surface of the screw rod. The protection mechanism also includes a transverse rod and a roller brush. The transverse rod is fixedly connected to the right side of the pull table, the roller brush is rotatably connected to the bottom of the transverse rod, the hollow rod is in contact with the pull table, the elastic rod is in contact with the pull table, and the roller brush is in contact with the glass cover. When the test is finished, the bidirectional screw rotates. The pull seat is pulled towards the center, causing the connecting rod to slide on the inner wall of the glass cover, which in turn moves the hollow rod. The movement of the hollow rod causes the drive wheel to contact the glass cover and rotate. The rotation of the drive wheel causes the screw three to rotate. At this time, the elastic rod on the outer circumference of the screw three is driven by the screw three to pull towards the center. Products that break due to non-compliance during the inspection process are gathered to the lifting seat in the middle. Finally, the handle is turned to drive the screw one to recover the non-compliance material. When there is a lot of dust on the upper surface of the glass cover of the device, which affects the observation, the device is started without load. The motor drives the bidirectional screw to rotate, which causes the pull seat to pull towards the center and moves the transverse rod towards the center. The transverse rod drives the roller brush to move on the surface of the glass cover to achieve the effect of cleaning the glass cover.

[0007] The present invention, by adopting the above technical solution, can bring the following beneficial effects: 1. This bio-based material tensile property testing device, with the cooperation of lifting wheel, bidirectional screw, and lifting seat, allows the lifting wheel to contact the bidirectional screw, raising the lifting seat to eliminate the cost of manual cutting and greatly save on sample loss. The circular cutting shape facilitates the fixation of the plastic part in the subsequent stretching step and allows for a more intuitive view of the stretching morphology of the plastic part.

[0008] 2. The tensile property testing device for bio-based materials, with the cooperation of the pull rod, reset block, and pull base, moves the reset block downward under the limit of the pull rod, aligning the plastic part to be tested for tensile strength, preventing the guide lifting part from tilting horizontally during the tensile process, and ensuring the standardization of the test data.

[0009] 3. The tensile property testing device for bio-based materials, with the cooperation of the pull base, bidirectional screw, transverse rod, and roller brush, starts the device during no-load operation. The motor drives the bidirectional screw to rotate, which in turn drives the pull base to converge towards the center and the transverse rod to move towards the center. The transverse rod drives the roller brush to move on the surface of the glass cover to achieve the effect of cleaning the glass cover. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the throttle structure of the present invention; Figure 3 For the present invention Figure 2 Enlarged schematic diagram of the structure at point B; Figure 4 For the present invention Figure 1 Enlarged schematic diagram of the structure at point A in the middle; Figure 5 This is a schematic diagram of the screw structure of the present invention; Figure 6 This is a schematic diagram of the pull-table structure of the present invention; Figure 7 For the present invention Figure 6 Enlarged schematic diagram of the structure at point C; Figure 8 This is a schematic diagram of the glass cover structure of the present invention; Figure 9 This is a schematic diagram of the roller brush structure of the present invention.

[0011] In the diagram: 1. Base; 2. Rotary handle; 3. Cutting mechanism; 301. Screw 1; 302. Screw 2; 303. Ring cutter; 304. Inner ring cutter; 305. Spring 1; 306. Knife holder; 307. Limiting rod; 308. Bottom knife; 309. Lifting seat; 310. Dip plate; 311. Spring 2; 312. Slide plate; 313. Lifting wheel; 4. Detection mechanism; 401. Pulling seat; 402. Pulling rod; 403. Limiting hole; 404. Limiting... Positioning post; 405, Gear; 406, Screw; 407, Rack; 408, Pulling table; 409, Feed port; 410, Reset block; 411, Spring four; 412, Limiting groove; 413, Convex block; 5, Protection mechanism; 501, Glass cover; 502, Hollow rod; 503, Drive wheel; 504, Screw three; 505, Connecting rod; 506, Elastic rod; 507, Horizontal movement rod; 508, Roller brush; 6, L-shaped groove; 7, Bidirectional screw. Detailed Implementation

[0012] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0013] Please see Figures 1-9One embodiment of the present invention is: a device for testing the tensile properties of bio-based materials, comprising a base 1, a protective mechanism 5 on the top of the base 1, an L-shaped groove 6 on the top of the base 1, a sample cutting mechanism 3 on the top of the base 1, a bidirectional screw 7 rotatably connected to the bottom of the base 1, a detection mechanism 4 on the outer circumference of the bidirectional screw 7, and a handle 2 on the left side of the base 1. The sample cutting mechanism 3 includes a first screw 301, a second screw 302, a ring cutter 303, and an inner ring cutter. The machine consists of a cutter 304, a spring 305, a cutter holder 306, a limit rod 307, a bottom cutter 308, and a lifting seat 309. A screw 301 is rotatably connected to the bottom of the machine base 1. A screw 302 is rotatably connected to the inner surface of the bottom of the machine base 1. The cutter holder 306 is slidably connected to the outer circumferential surface of the screw 302. A ring cutter 303 is fixedly connected to the bottom of the cutter holder 306. An inner ring cutter 304 is slidably connected inside the cutter holder 306. One end of the spring 305 is fixedly connected to the bottom of the cutter holder 306. The cutting mechanism 3 includes a spring 305, with one end fixedly connected to the top of the inner ring cutter 304. A limiting rod 307 is fixedly connected to the inner surface of the bottom of the base 1. A bottom cutter 308 is slidably connected to the top of the base 1. A lifting seat 309 is slidably connected to the inner wall of the bottom cutter 308. The cutting mechanism 3 also includes a slidable plate 310, a second spring 311, a sliding plate 312, and a lifting wheel 313. The slidable plate 310 is slidably connected to the inner wall of the inner ring cutter 304. One end of the second spring 311 is fixedly connected to the inner ring cutter 304. 4. At the bottom, the other end of spring 2 311 is fixedly connected to the top of the dip plate 310, the slide plate 312 is fixedly connected to the bottom of the bottom knife 308, the lifting wheel 313 is fixedly connected to the bottom of the lifting seat 309, the knife holder 306 is slidably connected to the outer circumferential surface of the limiting rod 307, the slide plate 312 is slidably connected to the inner wall of the L-shaped groove 6, the bidirectional screw 7 is located on the movement trajectory of the lifting wheel 313, the top of the screw 2 302 is equipped with a motor, and the throttle 2 is fixedly connected to the left side of the screw 1 301; The testing mechanism 4 includes a pull base 401, a pull rod 402, a limiting hole 403, a limiting post 404, a pull table 408, a spring 411, a limiting groove 412, and a convex block 413. The pull base 401 is slidably connected to the outer circumferential surface of the bidirectional screw 7. The pull rod 402 is fixedly connected to the bottom of the pull base 401. The limiting hole 403 is formed on the outer circumferential surface of the pull rod 402. The pull table 408 is fixedly connected to the top of the base 1. The limiting groove 412 is formed on the top of the pull table 408. The convex block 413 is slidably connected to the inner wall of the limiting groove 412. One end of the spring 411 is fixedly connected to the inner wall of the pull table 408, and the other end of the spring 411 is fixedly connected to the front of the convex block 413. The limiting post 404 is fixedly connected to the outer surface of the convex block 413. The detection mechanism 4 also includes a gear 405, a screw 406, a rack 407, a feeding port 409, and a reset block 410. The screw 406 is rotatably connected to the top of the convex block 413. The gear 405 is fixedly connected to the outer circumferential surface of the screw 406. The reset block 410 is slidably connected to the outer circumferential surface of the screw 406. The rack 407 is fixedly connected to the inner wall of the pull table 408. The feeding port 409 is opened on the outer circumferential surface of the pull table 408. The limiting post 404 is located on the movement trajectory of the limiting hole 403. The reset block 410 is located on the movement trajectory of the pull rod 402. The gear 405 meshes with the rack 407.

[0014] Working principle: The plastic material to be tested is placed manually on the cutting mechanism 3. The cutting mechanism 3 is started, causing the screw 302 to rotate and drive the cutter holder 306 downwards. The downward movement of the cutter holder 306 drives the ring cutter 303 downwards, which in turn drives the inner ring cutter 304 downwards, simultaneously bringing the adhesive plate 310 into contact with the plastic material to be tested. The cutter holder 306 continues to move downwards, cutting the plastic material into a hollow ring shape. After cutting, the motor reverses, driving the cutter holder 306 to rise and lifting the adhesive plate 310. As the adhesive plate 310 rises, it adheres to the plastic material. The waste material inside the cut ring moves upward, and the remaining waste material on the outside is removed manually. At this time, only the ring-shaped part remains on the top of the lifting seat 309. Then, rotating the handle 2 drives the screw 301 to rotate. The rotation of the screw 301 drives the slide plate 312 to move along the L-shaped groove 6, which in turn moves the lifting seat 309 to the bottom of the pulling table 408. At this time, the lifting wheel 313 contacts the bidirectional screw 7, causing the lifting seat 309 to rise to the top of the feeding port 409. This eliminates the cost of manual cutting and greatly saves the loss of the sample. The ring-shaped cutting shape can facilitate the fixing of the plastic part in the subsequent stretching steps and make the stretching shape of the plastic part more intuitive. When the cut plastic part moves to the bottom of the feed port 409, the drive motor causes the bidirectional screw 7 to rotate, driving the two pull seats 401 to unfold outward along the limiting groove 412, pulling the plastic part outward. At the same time, the inner wall of the driving limiting hole 403 contacts the limiting post 404 to limit the workpiece being tested, preventing the workpiece from detaching during the stretching process and affecting the testing efficiency. Subsequently, the bidirectional screw 7 continues to drive the pull rod 402 to move to both ends, driving the convex block 413 to move. The movement of the convex block 413 drives the top gear 405 to mesh along the rack 407, causing the gear 405 to rotate, thereby driving the top screw 406 to rotate. Under the limitation of the pull rod 402, the reset block 410 moves downward to straighten the plastic part being stretched, preventing the guide lifting part from tilting horizontally during the stretching process and ensuring the standardization of the test data.

[0015] Please see Figures 1-9 Based on the above embodiments, in another embodiment of the present invention, the protective mechanism 5 includes a glass cover 501, a hollow rod 502, a drive wheel 503, a screw 504, a connecting rod 505, and an elastic rod 506. The glass cover 501 is fixedly connected to the top of the pull table 408, the connecting rod 505 is fixedly connected to the outer wall of the pull table 401, the hollow rod 502 is fixedly connected to the front part of the connecting rod 505, and the screw 504 is rotatably connected inside the hollow rod 502. The drive wheel 503 is fixedly connected to the right side of the screw 3 504, and the elastic rod 506 is slidably connected to the outer circumferential surface of the screw 3 504. The protection mechanism 5 also includes a transverse rod 507 and a roller brush 508. The transverse rod 507 is fixedly connected to the right side of the pull base 401, and the roller brush 508 is rotatably connected to the bottom of the transverse rod 507. The hollow rod 502 is in contact with the pull base 408, the elastic rod 506 is in contact with the pull base 408, and the roller brush 508 is in contact with the glass cover 501.

[0016] Working principle: When the test is finished, the bidirectional screw 7 rotates, causing the pull seat 401 to converge towards the center, which in turn causes the connecting rod 505 to slide on the inner wall of the glass cover 501, thereby moving the hollow rod 502. The movement of the hollow rod 502 causes the drive wheel 503 to contact the glass cover 501, causing the drive wheel 503 to rotate. The rotation of the drive wheel 503 causes the screw three 504 to rotate. At this time, the elastic rod 506 on the outer circumference of the screw three 504 converges towards the center under the drive of the screw three 504. Products that break due to non-compliance during the test are gathered to the lifting seat 309 in the middle. Finally, the handle 2 is rotated to drive the screw one 301 to recover the non-compliance. When there is a lot of dust on the upper surface of the glass cover 501 of the device, which affects the observation, the device is started up with no load. The motor drives the bidirectional screw 7 to rotate, causing the pull seat 401 to converge towards the center, which in turn causes the transverse rod 507 to move towards the center. The transverse rod 507 drives the roller brush 508 to move on the surface of the glass cover 501 to achieve the effect of cleaning the glass cover 501.

[0017] This invention provides a device for testing the tensile properties of bio-based materials. Many methods and approaches exist for implementing this technical solution; the above description is merely a preferred embodiment of the invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications should also be considered within the scope of protection of this invention. All components not explicitly stated in this embodiment can be implemented using existing technologies.

Claims

1. A device for testing the tensile properties of bio-based materials, comprising a base (1), characterized in that: The base (1) is provided with a protective mechanism (5) at the top, an L-shaped groove (6) is provided at the top of the base (1), a cutting mechanism (3) is provided at the top of the base (1), a bidirectional screw (7) is rotatably connected to the bottom of the base (1), a detection mechanism (4) is provided on the outer circumference of the bidirectional screw (7), and a throttle (2) is provided on the left side of the base (1). The cutting mechanism (3) includes a screw one (301), a screw two (302), a ring cutter (303), an inner ring cutter (304), a spring one (305), a cutter holder (306), a limiting rod (307), a bottom cutter (308), and a lifting seat (309). The screw one (301) is rotatably connected to the bottom of the machine base (1), the screw two (302) is rotatably connected to the inner surface of the bottom of the machine base (1), and the cutter holder (306) is slidably connected to the outer circumferential surface of the screw two (302). The ring cutter (305) 303) is fixedly connected to the bottom of the knife holder (306), the inner ring cutter (304) is slidably connected to the inside of the knife holder (306), one end of the spring (305) is fixedly connected to the bottom of the knife holder (306), the other end of the spring (305) is fixedly connected to the top of the inner ring cutter (304), the limiting rod (307) is fixedly connected to the inner surface of the bottom of the machine base (1), the bottom cutter (308) is slidably connected to the top of the machine base (1), and the lifting seat (309) is slidably connected to the inner wall of the bottom cutter (308).

2. The device for testing the tensile properties of bio-based materials according to claim 1, characterized in that: The cutting mechanism (3) also includes a dip plate (310), a second spring (311), a sliding plate (312), and a lifting wheel (313). The dip plate (310) is slidably connected to the inner wall of the inner ring cutter (304). One end of the second spring (311) is fixedly connected to the bottom of the inner ring cutter (304), and the other end of the second spring (311) is fixedly connected to the top of the dip plate (310). The sliding plate (312) is fixedly connected to the bottom of the bottom cutter (308), and the lifting wheel (313) is fixedly connected to the bottom of the lifting seat (309).

3. The device for testing the tensile properties of bio-based materials according to claim 2, characterized in that: The tool holder (306) is slidably connected to the outer circumferential surface of the limiting rod (307), the slide plate (312) is slidably connected to the inner wall of the L-shaped groove (6), the bidirectional screw (7) is located on the movement trajectory of the lifting wheel (313), the top of the screw two (302) is equipped with a motor, and the throttle (2) is fixedly connected to the left side of the screw one (301).

4. The tensile property testing device for bio-based materials according to claim 3, characterized in that: The detection mechanism (4) includes a pull base (401), a pull rod (402), a limiting hole (403), a limiting post (404), a pull table (408), a spring (411), a limiting groove (412), and a convex block (413). The pull base (401) is slidably connected to the outer circumferential surface of the bidirectional screw (7), and the pull rod (402) is fixedly connected to the bottom of the pull base (401). The limiting hole (403) is opened on the outer circumference of the pull rod (402). On the other hand, the pull table (408) is fixedly connected to the top of the base (1), the limiting groove (412) is opened on the top of the pull table (408), the convex block (413) is slidably connected to the inner wall of the limiting groove (412), one end of the spring four (411) is fixedly connected to the inner wall of the pull table (408), the other end of the spring four (411) is fixedly connected to the front of the convex block (413), and the limiting post (404) is fixedly connected to the outer surface of the convex block (413).

5. The tensile property testing device for bio-based materials according to claim 4, characterized in that: The detection mechanism (4) also includes a gear (405), a screw (406), a rack (407), a feed port (409), and a reset block (410). The screw (406) is rotatably connected to the top of the convex block (413). The gear (405) is fixedly connected to the outer circumferential surface of the screw (406). The reset block (410) is slidably connected to the outer circumferential surface of the screw (406). The rack (407) is fixedly connected to the inner wall of the pull table (408). The feed port (409) is opened on the outer circumferential surface of the pull table (408).

6. The tensile property testing device for bio-based materials according to claim 5, characterized in that: The limiting post (404) is located on the movement trajectory of the limiting hole (403), the reset block (410) is located on the movement trajectory of the pull rod (402), and the gear (405) meshes with the rack (407).

7. The tensile property testing device for bio-based materials according to claim 6, characterized in that: The protective mechanism (5) includes a glass cover (501), a hollow rod (502), a drive wheel (503), a screw rod (504), a connecting rod (505), and an elastic rod (506). The glass cover (501) is fixedly connected to the top of the pull table (408). The connecting rod (505) is fixedly connected to the outer wall of the pull table (401). The hollow rod (502) is fixedly connected to the front of the connecting rod (505). The screw rod (504) is rotatably connected to the inner wall of the hollow rod (502). The drive wheel (503) is fixedly connected to the right side of the screw rod (504). The elastic rod (506) is slidably connected to the outer circumferential surface of the screw rod (504).

8. The tensile property testing device for bio-based materials according to claim 7, characterized in that: The protection mechanism (5) also includes a horizontal moving rod (507) and a roller brush (508). The horizontal moving rod (507) is fixedly connected to the right side of the pull seat (401), and the roller brush (508) is rotatably connected to the bottom of the horizontal moving rod (507).

9. The tensile property testing device for bio-based materials according to claim 8, characterized in that: The hollow rod (502) contacts the pull table (408), the elastic rod (506) contacts the pull table (408), and the roller brush (508) contacts the glass cover (501).

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