Detection equipment for detecting tensile force of plastic product

Abstract

The invention relates to the technical field of tension detection, and discloses a detection device for plastic product tension detection, which comprises a workbench, the top end of the workbench is fixedly connected with a tension adjusting mechanism, two sides of the top end of the tension adjusting mechanism are fixedly connected with tension sensors, and close side surfaces of the two tension sensors are fixedly connected with rotating mechanisms. The side faces, close to each other, of the two rotating mechanisms are fixedly connected with fixing mechanisms, and the interiors of the two fixing mechanisms are fixedly connected with a to-be-tested plastic rope. A gear disc rotates, the gear disc rotates to drive a rotating ring to rotate, and the rotating ring drives a third limiting block and a first limiting block to rotate when rotating, so that second connecting rods and first connecting rods rotate, the distance between the two second connecting rods and the distance between the two first connecting rods are changed, and a to-be-tested plastic rope is automatically fixed; and each to-be-tested plastic rope can be fixed through two groups of four to-be-tested plastic ropes, so that the fixing effect is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of tensile force detection, and more particularly to a detection device for tensile force detection of plastic products. Background Art

[0002] Plastic products are a general term for household and industrial products made from plastic as the main raw material. Plastic products include products made from injection molding, vacuum forming, and other processes using plastic as the raw material. Plastic is a type of synthetic polymer material with plasticity. Plastic products, along with synthetic rubber and synthetic fibers, form the three major synthetic materials that are indispensable in daily life. Specifically, plastic is a material that uses natural or synthetic resin as the main component and various additives. It can be molded into a certain shape under certain conditions of temperature and pressure and maintains its shape at room temperature. After plastic products are manufactured, they need to undergo tensile testing. This is an important test method for evaluating the mechanical properties of plastic materials. It primarily measures various mechanical properties of plastics during the stretching process, such as tensile strength, elongation at break, and elastic modulus, by applying tensile force to ensure that the plastics produced meet production requirements. Nowadays, when plastic products are subjected to tensile testing, such as rope-shaped plastic products, they need to be fixed. However, rope-shaped plastic products are difficult to fix. If they are not firmly fixed, the rope-shaped plastic products will break away from the fixing mechanism when stretched, and there is a possibility of causing harm to the workers. During tensile testing, the rope-shaped plastic products themselves are long strips, so after being fixed, they may rotate, which will give the rope-shaped plastic products a torque. Under the action of the torque, the plastic products will cause fluctuations in the test results, and thus the test results cannot be guaranteed to be sufficiently accurate. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a testing device for tensile testing of plastic products to solve the technical problems raised in the background art.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a testing device for tensile testing of plastic products, comprising a workbench, the top of the workbench is fixedly connected to a tension adjustment mechanism, both sides of the top of the tension adjustment mechanism are fixedly connected to tension sensors, the sides of the two tension sensors that are close to each other are fixedly connected to a rotating mechanism, the sides of the two rotating mechanisms that are close to each other are fixedly connected to a fixing mechanism, and the interiors of the two fixing mechanisms are fixedly connected to a plastic rope to be tested; the fixing mechanism comprises a servo motor that can provide power, the side of the servo motor is fixedly connected to an output gear, the side of the output gear is meshed with a connecting gear, the side of the connecting gear away from the output gear is fixedly connected to a synchronous gear, the side of the synchronous gear is meshed with a gear plate, both sides of the gear plate are fixedly connected to a rotating ring, the sides of the two rotating rings are movably connected to a low clamping assembly and a high clamping assembly, and the interior of the rotating ring is movably connected to a fixed ring.

[0005] In a preferred embodiment, the two fixing mechanisms fix a plastic rope to be tested, the tension sensor is connected to the rotation mechanism and the tension adjustment mechanism, and the tension sensor automatically performs tension detection, and the two tension sensors, the rotation mechanism and the rotation mechanism are mirror-symmetrical relative to the center of the workbench.

[0006] In a preferred embodiment, two low clamping assemblies and a high clamping assemblies are provided on the side of each rotating ring, the two low clamping assemblies and the two high clamping assemblies are set as a group, and the two low clamping assemblies and the two high clamping assemblies are mirror-symmetrical relative to the center of the fixed ring, and the low clamping assemblies and the high clamping assemblies are perpendicular to each other.

[0007] In a preferred embodiment, the low clamping assembly includes a first rotating block movably connected to a fixed ring, a first connecting rod is fixedly connected to the side of the first rotating block, a first limiting block is movably connected to the side of the first connecting rod away from the first rotating block, the side of the first limiting block is movably connected to the side of the rotating ring, and a avoidance groove adapted to the first connecting rod is provided inside the first limiting block.

[0008] In a preferred embodiment, the high clamping assembly includes a second rotating block movably connected to a fixed ring, the side of the second rotating block is fixedly connected to a second connecting rod, the second connecting rod is movably connected to a third limit block away from the side of the second rotating block, and the side of the first limit block is movably connected to the side of the rotating ring.

[0009] In a preferred embodiment, the side of the fixed ring is fixedly connected to two support frames, the inner sides of the two rotating rings are fixedly connected to two limit rods, the two limit rods are located on both sides of the gear plate, the two support frames are located on both sides of the two limit rods, and the side of the support frame is provided with a avoidance groove adapted to the limit rod, and the side of the support frame is fixedly connected to the side of the rotating disk in the rotating mechanism.

[0010] In a preferred embodiment, the rotating mechanism includes a fixed disk fixedly connected to the tension sensor, a limiting groove is provided on the side of the fixed disk away from the tension sensor, the limiting disk is fixedly connected in the limiting groove of the tension sensor, the side of the limiting disk away from the fixed disk is fixedly connected with a connecting column, and the side of the connecting column away from the fixed disk is fixedly connected with a rotating disk.

[0011] In a preferred embodiment, anti-slip ribs are provided in the avoidance hole of the fixed disc, and anti-slip ribs are provided on the side of the connecting column. The anti-slip ribs of the fixed disc and the anti-slip ribs of the connecting column are in contact with each other, and a distance of one millimeter is left between the anti-slip ribs on the side of the connecting column and the limiting disc, and a distance of one millimeter is left between the anti-slip ribs in the fixed disc and the side of the limiting disc.

[0012] In a preferred embodiment, the tension adjustment mechanism includes a support platform fixedly connected to the workbench, the support platform is internally movably connected with a bidirectional threaded rod, the side of the bidirectional threaded rod is fixedly connected to an adjustment motor, and mirrored thread grooves are provided on both sides of the bidirectional threaded rod. The sides of the two thread grooves of the bidirectional threaded rod are threadedly connected to a movable plate, the tops of the two movable plates are fixedly connected to a connecting plate, and the sides of the two connecting plates close to each other are fixedly connected to a tension sensor, the center of the bidirectional threaded rod is movably connected to a central stopper, the side of the central stopper is fixedly connected to the interior of the support platform, and the interior of the support platform is provided with a avoidance groove for the movable plate to move.

[0013] The technical effects and advantages of the present invention are as follows: When the servo motor of the present invention drives the connecting gear to rotate through the output gear, the gear plate is eventually rotated, and the rotation of the gear plate drives the rotating ring to rotate. When the rotating ring rotates, the third limit block and the first limit block are driven to rotate, thereby causing the second connecting rod and the first connecting rod to rotate. The distance between the two second connecting rods and the two first connecting rods changes, and the plastic rope to be tested is automatically fixed. Each plastic rope to be tested can be fixed by two groups of four and, thereby ensuring a fixing effect. After the plastic rope to be tested is fixed, the plastic rope to be tested may have a certain torsion angle and be subjected to a certain torque. At this time, the rotating disc is rotated, and the rotating disc drives the connecting column to rotate inside the fixed disc. The rotating disc drives the rotating mechanism and the plastic rope to be tested to rotate as a whole, so that the plastic rope to be tested is released from the torsion state, thereby ensuring that the plastic rope to be tested can be accurately tested. The present invention fixes the plastic rope to be tested by two fixing mechanisms. At this time, the adjusting motor is started, and the adjusting motor drives the bidirectional threaded rod to rotate. When the bidirectional threaded rod rotates, the thread grooves on both sides drive the movable plates on both sides to move closer to or away from each other. When the movable plate moves, it drives the tension sensor, the rotating mechanism and the fixing mechanism to move through the connecting plate, thereby accurately applying tension, so that the detection process is carried out automatically and efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0015] Figure 2 It is a schematic diagram of the connection structure between the tension sensor and the rotation mechanism of the present invention.

[0016] Figure 3 It is a schematic diagram of the overall structure of the fixing mechanism of the present invention.

[0017] Figure 4 It is a structural schematic diagram of the fixing mechanism and the rotating mechanism of the present invention.

[0018] Figure 5 It is a schematic diagram of the exploded structure of the fixing mechanism of the present invention.

[0019] Figure 6 It is a schematic diagram of the exploded structure of the rotating mechanism of the present invention.

[0020] Figure 7 It is a schematic diagram of the internal structure of the fixed disc of the present invention.

[0021] Figure 8 It is a structural schematic diagram of the tension adjustment mechanism of the present invention.

[0022] The accompanying drawings are marked as follows: 1. workbench; 2. tension adjustment mechanism; 201. support platform; 202. adjustment motor; 203. bidirectional threaded rod; 204. center stopper; 205. movable plate; 206. connecting plate; 3. tension sensor; 4. rotating mechanism; 401. fixed disc; 402. limit disc; 403. connecting column; 404. rotating disc; 5. fixing mechanism; 501. servo motor; 502. output gear; 50 3. Connecting gear; 504. Synchronous gear; 505. Gear plate; 506. Rotating ring; 507. Fixed ring; 508. Low clamping assembly; 509. High clamping assembly; 510. Support frame; 511. Limit rod; 5081. First rotating block; 5082. First connecting rod; 5083. First limit block; 5091. Second rotating block; 5092. Second connecting rod; 5093. Third limit block; 6. Plastic rope to be tested. DETAILED DESCRIPTION

[0023] The technical solutions of the present invention will be described clearly and completely below in conjunction with the drawings in the present invention. In addition, the forms of the various structures described in the following embodiments are merely examples. The present invention relates to a testing device for tensile testing of plastic products and is not limited to the various structures described in the following embodiments. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0024] Reference Figure 1 and Figure 2 The present invention provides a testing device for tensile testing of plastic products, comprising a workbench 1, a tension adjustment mechanism 2 being fixedly connected to the top of the workbench 1, tension sensors 3 being fixedly connected to both sides of the top of the tension adjustment mechanism 2, the sides of the two tension sensors 3 being fixedly connected to a rotating mechanism 4, the sides of the two rotating mechanisms 4 being fixedly connected to each other are fixedly connected to a fixing mechanism 5, the interiors of the two fixing mechanisms 5 are fixedly connected to a plastic rope 6 to be tested, the two fixing mechanisms 5 fix one plastic rope 6 to be tested, the tension sensor 3 is connected to the rotating mechanism 4 and the tension adjustment mechanism 2, and the tension sensor 3 automatically performs tension detection, the two tension sensors 3, the rotating mechanism 4 and the rotating mechanism 4 are mirror-symmetrical relative to the center of the workbench 1.

[0025] In an embodiment of the present application, when the present application performs a tensile force test on the plastic rope 6 to be tested, the plastic rope 6 to be tested is placed in two fixing mechanisms 5, at which time it can be automatically fixed. After fixation, when the plastic rope 6 to be tested is stretched, the tensile force sensor 3 is connected to the rotating mechanism 4 and the fixing mechanism 5, and can automatically perform detection. Therefore, the present application can automatically perform tensile force detection, and the operation is more convenient.

[0026] Reference Figure 3 、 Figure 4as well as Figure 5 , the fixing mechanism 5 includes a servo motor 501 that can provide power, and the side of the servo motor 501 is fixedly connected to the output gear 502, and the side of the output gear 502 is meshed with a connecting gear 503, and the side of the connecting gear 503 away from the output gear 502 is fixedly connected to the synchronous gear 504, and the side of the synchronous gear 504 is meshed with a gear plate 505, and both sides of the gear plate 505 are fixedly connected to a rotating ring 506, and the sides of the two rotating rings 506 are movably connected to a low clamping component 508 and a high clamping component 509, and the interior of the rotating ring 506 is movably connected to a fixed ring 507, and each side of the rotating ring 506 is provided with two low clamping components 508 and a high clamping component 509, and the two low clamping components 508 and the two high clamping components 509 are set as a group, and the two low clamping components 508 and the two high clamping components 509 are mirror-symmetrical with respect to the center of the fixed ring 507, and the low clamping component 508 and the high clamping component 509 are perpendicular to each other; The low clamping assembly 508 includes a first rotating block 5081 movably connected to the fixed ring 507, a first connecting rod 5082 is fixedly connected to the side of the first rotating block 5081, and a first limiting block 5083 is movably connected to the side of the first connecting rod 5082 away from the first rotating block 5081. The side of the first limiting block 5083 is movably connected to the side of the rotating ring 506, and the interior of the first limiting block 5083 is provided with a avoiding groove adapted to the first connecting rod 5082. The high clamping assembly 509 includes a second rotating block 5091 movably connected to the fixed ring 507, and a second connecting rod 5082 is fixedly connected to the side of the second rotating block 5091. 092, the second connecting rod 5092 is movably connected to the side of the second rotating block 5091 with the third limit block 5093, the side of the first limit block 5083 is movably connected to the side of the rotating ring 506, the side of the fixed ring 507 is fixedly connected to two support frames 510, the inner sides of the two rotating rings 506 are fixedly connected to two limit rods 511, the two limit rods 511 are located on both sides of the gear plate 505, the two support frames 510 are located on both sides of the two limit rods 511, and the side of the support frame 510 is provided with a avoidance groove adapted to the limit rod 511, and the side of the support frame 510 is fixedly connected to the side of the rotating disk 404 in the rotating mechanism 4.

[0027] In the embodiment of the present application, when the plastic rope 6 to be tested is fixed, the two first limit blocks 5083 in a set of low clamping components 508 are connected to the rotating ring 506. Therefore, when the rotating ring 506 rotates, the two first limit blocks 5083 move synchronously with the rotating ring 506, and the two first limit blocks 5083 are located on both sides of the rotating ring 506. At this time, the two first limit blocks 5083 drive the two first connecting rods 5082 to rotate, and the two first connecting rods 5082 are far away from each other. When the two first connecting rods 5082 are away from each other, the plastic rope 6 to be tested is put in. After the plastic rope 6 to be tested is put in, the two first connecting rods 5082 are close to each other, thereby clamping the plastic rope 6 to be tested. The high clamping component 509 has the same structure as the low clamping component 508, so the two second connecting rods 5092 will also clamp the plastic rope 6 to be tested. The two rotating rings 506 are away from the fixed ring 507 on both sides and are provided with low clamping components 508 and high clamping components 509. The two first connecting rods 5082 and the two second connecting rods 5092 are used to clamp the plastic rope 6 to be tested. There are four clamping positions in total to prevent the plastic rope 6 to be tested from slipping. The servo motor 501 applies power to automatically complete the clamping and loosening work. The operation process is more intelligent. When the servo motor 501 outputs power, the output gear 502 and the connecting gear 503 are meshed with each other, and the root circle diameter of the output gear 502 is one-fourth of the root circle diameter of the connecting gear 503. When the gear plate 505 is in a state of rotation, the connecting gear 503 is rotated slowly, and the gear plate 505 is rotated slowly, thereby improving the adjustment accuracy. The gear plate 505 connects the two rotating rings 506, and limit rods 511 are provided on both sides of the gear plate 505. Support frames 510 are provided on both sides of the two limit rods 511 away from the gear plate 505. Therefore, when the gear plate 505 rotates too much, the limit rods 511 will contact the support frames 510, which plays a limiting role and prevents the gear plate 505 from disengaging from the synchronous gear 504.

[0028] Reference Figure 3 、 Figure 4 、 Figure 6 as well as Figure 7The rotating mechanism 4 includes a fixed disc 401 fixedly connected to the tension sensor 3, and a limiting groove is provided on the side of the fixed disc 401 away from the tension sensor 3, and a limiting disc 402 is fixedly connected in the limiting groove of the tension sensor 3, and a connecting column 403 is fixedly connected to the side of the limiting disc 402 away from the fixed disc 401, and a rotating disc 404 is fixedly connected to the side of the connecting column 403 away from the fixed disc 401, and an anti-slip rib is provided in the avoidance hole of the fixed disc 401, and an anti-slip rib is provided on the side of the connecting column 403, and the anti-slip ribs of the fixed disc 401 and the anti-slip ribs of the connecting column 403 are in contact with each other, and a distance of one millimeter is left between the anti-slip ribs on the side of the connecting column 403 and the limiting disc 402, and a distance of one millimeter is left between the anti-slip ribs in the fixed disc 401 and the side of the limiting disc 402.

[0029] In the embodiment of the present application, the fixing ring 507 is fixedly connected to the rotating disk 404 through 410, and the servo motor 501 is located inside the rotating disk 404. Therefore, when the rotating disk 404 rotates, it will drive the fixing mechanism 5 to rotate as a whole. Therefore, after the fixing mechanism 5 fixes the plastic rope 6 to be tested, as the fixing mechanism 5 rotates, the plastic rope 6 to be tested will twist itself. At this time, the plastic rope 6 to be tested, which was originally in a twisted state, can be restored to avoid applying torque when performing tension testing on the plastic rope 6 to be tested, thereby ensuring measurement accuracy. Anti-slip ribs are provided on the inside of the fixing disk 401 and the side of the connecting column 403, so that the fixing disk 401 will not rotate easily when in contact with the connecting column 403. Therefore, after the connecting column 403 is rotated relative to the fixing disk 401, the connecting column 403 will not automatically return to its position.

[0030] Reference Figure 2 and Figure 8 The tension adjustment mechanism 2 includes a support platform 201 fixedly connected to the workbench 1, and the support platform 201 is internally movably connected with a bidirectional threaded rod 203, and the side of the bidirectional threaded rod 203 is fixedly connected with an adjustment motor 202, and mirrored thread grooves are provided on both sides of the bidirectional threaded rod 203. The sides of the two thread grooves of the bidirectional threaded rod 203 are threadedly connected with a movable plate 205, and the tops of the two movable plates 205 are fixedly connected with a connecting plate 206, and the sides of the two connecting plates 206 close to each other are fixedly connected with a tension sensor 3, and the center of the bidirectional threaded rod 203 is movably connected with a central stopper 204, and the side of the central stopper 204 is fixedly connected to the inside of the support platform 201, and the inside of the support platform 201 is provided with a avoidance groove for the movable plate 205 to move.

[0031] In the embodiment of the present application, the connecting plate 206 is fixedly connected to the tension sensor 3, and the tension sensor 3 is fixedly connected to the rotating mechanism 4 on the side away from the movable plate 205, and the rotating mechanism 4 is fixedly connected to the fixing mechanism 5. Therefore, when the two fixing mechanisms 5 fix the plastic rope 6 to be tested, the two movable plates 205 will move closer to or away from each other when the two movable plates 205 rotate. When the two movable plates 205 move away from each other, the connecting plate 206 will be driven away from each other. At this time, the plastic rope 6 to be tested will be stretched, and the force during stretching can be measured by the tension sensor 3, and the two tension sensors 3 measure synchronously. When there is a large error in the data detected by the two tension sensors 3, it indicates that there is a problem with the detection. To improve the accuracy of the detection, the movable plate 205 is located in the middle of the two-way threaded rod 203 to prevent the two movable plates 205 from leaving the thread groove on the side of the two-way threaded rod 203 when moving.

[0032] The working principle of the present invention is as follows: the servo motor 501 controls the output gear 502 to rotate in the opposite direction. When the output gear 502 rotates in the opposite direction, it drives the gear plate 505 to rotate in the opposite direction through the connecting gear 503 and the synchronous gear 504. The gear plate 505 rotates in the opposite direction and drives the two rotating rings 506 to rotate in the opposite direction. When the rotating ring 506 rotates in the opposite direction, it drives the third limit block 5093 and the first limit block 5083 to move away from the second rotating block 5091 and the first rotating block 5081 in the same group. At this time, the distance between the two first connecting rods 5082 and the two second connecting rods 5092 becomes smaller. At this time, the two sides of the plastic rope 6 to be tested can be placed between the two first connecting rods 5082 and the two second connecting rods 5092 respectively. After the plastic rope 6 to be tested is put in, the servo motor 501 controls the output gear 502 to rotate forward. When the output gear 502 rotates forward, the gear plate 505 rotates forward, and then the two rotating rings 506 rotate forward. When the rotating ring 506 rotates forward, it drives the first limit block 5083 and the third limit block 5093 to rotate close to the first rotating block 5081 and the second rotating block 5091. At this time, the distance between the two first connecting rods 5082 and the second connecting rod 5092 is reduced, thereby automatically clamping and fixing the plastic rope 6 to be tested. The sides of the two rotating rings 506 away from the fixed ring 507 are provided with a low clamping component 508 and a high clamping component 509. Therefore, each side of the plastic rope 6 to be tested is provided with four points for fixing the plastic rope 6 to be tested, that is, four first connecting rods 5082 and four second connecting rods 5092 are clamped and fixed in pairs; After the fixing mechanism 5 fixes the plastic rope 6 to be tested as a whole, the adjusting motor 202 is started. The adjusting motor 202 starts to drive the bidirectional threaded rod 203 to rotate. When the bidirectional threaded rod 203 rotates, the two threaded grooves on its side rotate, thereby causing the two connecting plates 206 to move away from each other or closer to each other. When the two connecting plates 206 move away from each other, the tension sensor 3, the rotating mechanism 4 and the fixing mechanism 5 move away from each other, and the two fixing mechanisms 5 fix the two sides of the plastic rope 6 to be tested. Therefore, when the connecting plate 206 drives the two fixing mechanisms 5 to move, the plastic rope 6 to be tested will be stretched. At this time, the tension of the plastic rope 6 to be tested can be automatically detected by the tension sensor 3.

[0033] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A testing device for tensile testing of plastic products, comprising a workbench (1), characterized in that: The top of the workbench (1) is fixedly connected to a tension adjustment mechanism (2), and tension sensors (3) are fixedly connected to both sides of the top of the tension adjustment mechanism (2), and the sides of the two tension sensors (3) that are close to each other are fixedly connected to a rotation mechanism (4), and the sides of the two rotation mechanisms (4) that are close to each other are fixedly connected to a fixing mechanism (5), and the interiors of the two fixing mechanisms (5) are fixedly connected to the plastic rope (6) to be tested; the fixing mechanism (5) includes a servo motor (501) that can provide power, and the sides of the servo motor (501) are fixedly connected to output gears. The output gear (502) is meshed with a connecting gear (503) on its side, and a synchronous gear (504) is fixedly connected to the side of the connecting gear (503) away from the output gear (502). The synchronous gear (504) is meshed with a gear plate (505) on its side, and both sides of the gear plate (505) are fixedly connected to rotating rings (506). The sides of the two rotating rings (506) are movably connected to a low clamping assembly (508) and a high clamping assembly (509), and the interior of the rotating ring (506) is movably connected to a fixed ring (507).

2. A plastic product tensile testing device according to claim 1, characterized in that: The two fixing mechanisms (5) fix a plastic rope (6) to be tested, the tension sensor (3) is connected to the rotation mechanism (4) and the tension adjustment mechanism (2), and the tension sensor (3) automatically performs tension detection. The two tension sensors (3), the rotation mechanism (4), and the rotation mechanism (4) are mirror-symmetrical relative to the center of the workbench (1).

3. The tensile testing device for plastic products according to claim 1, characterized in that: Two low clamping assemblies (508) and a high clamping assemblies (509) are provided on the side of each rotating ring (506), and the two low clamping assemblies (508) and the two high clamping assemblies (509) are set as a group, and the two low clamping assemblies (508) and the two high clamping assemblies (509) are mirror-symmetrical relative to the center of the fixed ring (507), and the low clamping assemblies (508) and the high clamping assemblies (509) are perpendicular to each other.

4. The tensile testing device for plastic products according to claim 3, characterized in that: The low clamping assembly (508) includes a first rotating block (5081) movably connected to the fixed ring (507), a first connecting rod (5082) is fixedly connected to the side of the first rotating block (5081), a first limiting block (5083) is movably connected to the side of the first connecting rod (5082) away from the first rotating block (5081), a side of the first limiting block (5083) is movably connected to the side of the rotating ring (506), and a avoiding groove adapted to the first connecting rod (5082) is provided inside the first limiting block (5083).

5. The tensile testing device for plastic products according to claim 4, characterized in that: The high clamping assembly (509) includes a second rotating block (5091) movably connected to the fixed ring (507), a second connecting rod (5092) is fixedly connected to the side of the second rotating block (5091), and the second connecting rod (5092) is movably connected to the side of the second rotating block (5091) away from the third limiting block (5093), and the side of the first limiting block (5083) is movably connected to the side of the rotating ring (506).

6. The tensile testing device for plastic products according to claim 5, characterized in that: The side of the fixed ring (507) is fixedly connected to two support frames (510), and the inner sides of the two rotating rings (506) are fixedly connected to two limit rods (511). The two limit rods (511) are located on both sides of the gear plate (505). The two support frames (510) are located on both sides of the two limit rods (511), and the side of the support frame (510) is provided with a avoidance groove adapted to the limit rod (511). The side of the support frame (510) is fixedly connected to the side of the rotating disk (404) in the rotating mechanism (4).

7. The tensile testing device for plastic products according to claim 1, characterized in that: The rotating mechanism (4) comprises a fixed disc (401) fixedly connected to the tension sensor (3); a limiting groove is provided on a side of the fixed disc (401) away from the tension sensor (3); a limiting disc (402) is fixedly connected in the limiting groove of the tension sensor (3); a connecting column (403) is fixedly connected to the side of the limiting disc (402) away from the fixed disc (401); and a rotating disc (404) is fixedly connected to the side of the connecting column (403) away from the fixed disc (401).

8. The tensile testing device for plastic products according to claim 7, characterized in that: An anti-skid rib is provided in the avoidance hole of the fixed disc (401), and an anti-skid rib is provided on the side of the connecting column (403). The anti-skid rib of the fixed disc (401) and the anti-skid rib of the connecting column (403) are in contact with each other, and a distance of one millimeter is left between the anti-skid rib on the side of the connecting column (403) and the limiting disc (402), and a distance of one millimeter is left between the anti-skid rib in the fixed disc (401) and the side of the limiting disc (402).

9. The tensile testing device for plastic products according to claim 1, characterized in that: The tension adjustment mechanism (2) comprises a support platform (201) fixedly connected to the workbench (1); the support platform (201) is internally movably connected to a bidirectional threaded rod (203); the side of the bidirectional threaded rod (203) is fixedly connected to an adjustment motor (202); mirror-image thread grooves are provided on both sides of the bidirectional threaded rod (203); the sides of the two thread grooves of the bidirectional threaded rod (203) are both threadedly connected to a movable plate (205); the tops of the two movable plates (205) are both fixedly connected to a connecting plate (206); the sides of the two connecting plates (206) close to each other are both fixedly connected to a tension sensor (3); the center of the bidirectional threaded rod (203) is movably connected to a central stopper (204); the side of the central stopper (204) is fixedly connected to the inside of the support platform (201); and the inside of the support platform (201) is provided with a avoidance groove for the movable plate (205) to move.

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