A device and method for testing the annular fracture toughness of PTFE thin-walled pipe

Abstract

The present invention discloses a device and method for testing the annular fracture toughness of a PTFE thin-walled pipe, and relates to the technical field of annular fracture toughness testing of pipes. A device for testing the annular fracture toughness of a PTFE thin-walled pipe comprises a mounting frame, and also comprises: a conveyor belt rotatably arranged on the mounting frame; the present invention sets a conveyor belt and cooperates with a turntable, and then sets a light force applying station, a heavy force applying station, a first verification station, and a second verification station, so that the test pipe stuck on the turntable can be automatically tested for a light annular fracture toughness test and a heavy annular fracture toughness test respectively, and in the process of performing the light annular fracture toughness test and the heavy annular fracture toughness test, the tests of the light annular fracture toughness and the heavy annular fracture toughness are verified respectively to verify whether the annular fracture toughness meets the light and heavy requirements, so the present device does not need manual testing, and effectively improves the testing efficiency and the uniformity of the testing standards.

Description

Technical Field

[0001] The invention belongs to the technical field of testing the annular fracture toughness of pipes, and in particular relates to a device for testing the annular fracture toughness of PTFE thin-wall pipes. Background Art

[0002] PTFE ultra-thin tube is a special material pipe with the following remarkable characteristics: it can withstand extremely high temperatures without damage, has super resistance to various corrosive substances, and can remain stable under high pressure environments; in addition, it has a high shrinkage rate, which means that it can significantly reduce the volume;

[0003] PTFE ultra-thin tubes are widely used in many fields, such as aviation, instrument manufacturing, textile chemicals, and medical treatment. Due to its extremely thin wall thickness, ability to withstand high temperatures, non-toxic and environmentally friendly, biocompatibility certification, and high shrinkage, it is particularly suitable for medical product parts that have strict requirements on wall thickness, high temperature resistance, and compliance with environmental protection standards.

[0004] Due to the limitations of the use environment of PTFE thin-walled tubes, the performance requirements for the circumferential fracture toughness are relatively high. In the existing technology, the toughness performance is mostly observed through artificial bending. However, the artificial bending method greatly reduces the efficiency of the test, and the different forces during artificial bending lead to inconsistent testing standards. Therefore, we propose a device for testing the circumferential fracture toughness of PTFE thin-walled tubes. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a device for testing the annular fracture toughness of PTFE thin-walled pipes which can overcome the above problems or at least partially solve the above problems.

[0006] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a device for testing the annular fracture toughness of PTFE thin-walled pipes, including a mounting frame, and also including: a conveyor belt rotatably arranged on the mounting frame, a limiting frame fixedly connected to the outer side of the conveyor belt; a plurality of turntables, which are rotatably connected to the mounting frame respectively, a force-bearing area is formed between the plurality of turntables, and a plurality of snap-in grooves are opened on the circumference of the turntable; a light force applying station and a heavy force applying station, the light force applying station is horizontal to the conveyor belt, and the heavy force applying station is at an angle to the light force applying station; a first verification station, The second verification station, the first verification station is located between the light force applying station and the heavy force applying station, and the angle between the second verification station and the heavy force applying station is degrees; the test tube is placed on the limiting frame, and the conveyor belt conveys the test tube to the rotating turntable, and the test tube is inserted into the insertion groove on the turntable, so that when the test tube passes through the light force applying station and the heavy force applying station in sequence, a bending force is applied to the test tube at the stress-bearing area; and when the test tube passes through the first verification station and the second verification station in sequence, the test tube is verified for airtight fracture.

[0007] Preferably, a first fixed shaft is provided on the mounting frame located at the light force application station, and a plurality of first curved force application plates are fixedly connected to the first fixed shaft. The plurality of first curved force application plates are respectively located in the force-bearing areas, and the outer circle of the first curved force application plates extends into the outer circle of the turntable.

[0008] Preferably, a second fixed shaft is provided on the mounting frame located at the gravity force applying station, and a plurality of second curved force applying plates are fixedly connected to the second fixed shaft. The plurality of second curved force applying plates are respectively located in the force bearing area, and the outer circle of the second curved force applying plates extends into the outer circle of the turntable.

[0009] Furthermore, a slide groove is provided on the mounting frame corresponding to the first fixed axis and the second fixed axis, and a slider is fixedly connected to the first fixed axis and the second fixed axis, and the slider is slidably connected in the slide groove, and the slider is connected to the inner wall of the slide groove by a first spring, and a bolt is threadedly connected to the mounting frame, one end of the bolt passes through the slide groove, and one end of the bolt is against the slider.

[0010] Preferably, the first sealing block and the second sealing block are symmetrically arranged on the mounting frame located at the first verification station and the second verification station, and the first sealing block and the second sealing block are both provided with air pipes. When the test tube passes through the first sealing block and the second sealing block respectively, the first sealing block and the second sealing block are respectively tightly attached to the two ends of the test tube, and air is inflated into the test tube to perform airtight fracture verification.

[0011] Preferably, the air pipe is slidably connected to the mounting frame, the first sealing block, the second sealing block and the mounting frame are connected via a second spring, the turntable is fixedly connected with shift blocks on both sides of the snap-in groove, and the shift blocks are located on the outer side of the turntable near the mounting frame.

[0012] Preferably, a joint is installed on the air pipe.

[0013] Furthermore, a stripping plate is fixedly connected to the mounting frame via a connecting arm, the stripping plate is inclined, and one end of the stripping plate close to the turntable extends toward the inner circle of the turntable.

[0014] Preferably, the conveyor belt and the turntable are driven by a motor.

[0015] A test method for testing the annular fracture toughness of a PTFE thin-walled pipe mainly comprises the following steps:

[0016] S1. Place the test tube on a limit rack on a conveyor belt. The conveyor belt drives the test tube to approach a rotating turntable. Then, the test tube on the limit rack is clamped into a clamping groove under the rotation of the turntable.

[0017] S2. The turntable rotates to bring the test pipe to the first bending force plate for a mild circumferential fracture toughness test;

[0018] S3. Then, the test pipe is brought to the first verification station to conduct airtight fracture verification after the mild circumferential fracture toughness test;

[0019] S4. The turntable continues to bring the test pipe to the second bending force plate for heavy circumferential fracture toughness test;

[0020] S5. Then the test pipe is brought to the second verification station for airtight fracture verification after the severe circumferential fracture toughness test. After the test is completed, the material is removed through the stripping plate under the rotation of the turntable.

[0021] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art: the present invention sets a conveyor belt and cooperates with a turntable, and then sets a light force applying station, a heavy force applying station, a first verification station, and a second verification station, so as to automatically perform a light circumferential fracture toughness test and a heavy circumferential fracture toughness test on the test pipe stuck on the turntable, and in the process of performing the light circumferential fracture toughness test and the heavy circumferential fracture toughness test, the tests of the light circumferential fracture toughness and the heavy circumferential fracture toughness are verified respectively to verify whether the circumferential fracture toughness meets the light and heavy requirements. Therefore, the device does not require manual testing, which effectively improves the test efficiency and the uniformity of the test standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In the attached picture:

[0023] Figure 1 A schematic diagram of the three-dimensional structure of a device for testing the annular fracture toughness of PTFE thin-walled pipes proposed by the present invention Figure 1 ;

[0024] Figure 2 The present invention proposes a device for testing the annular fracture toughness of PTFE thin-walled pipes. Figure 1 The structural diagram at A in the middle;

[0025] Figure 3 A schematic diagram of the three-dimensional structure of a device for testing the annular fracture toughness of PTFE thin-walled pipes proposed by the present invention Figure 2 ;

[0026] Figure 4 The main view of the device for testing the annular fracture toughness of PTFE thin-walled pipes proposed by the present invention Figure 1 ;

[0027] Figure 5 The main view of the device for testing the annular fracture toughness of PTFE thin-walled pipes proposed by the present invention Figure 2 ;

[0028] Figure 6 A top view of a device for testing the circumferential fracture toughness of a PTFE thin-walled tube proposed by the present invention;

[0029] Figure 7 This is a right side view of a device for testing the annular fracture toughness of a PTFE thin-walled tube proposed by the present invention.

[0030] In the figure: 1. mounting frame; 11. conveyor belt; 12. limit frame; 13. test pipe; 14. turntable; 140. force area; 141. snap-in groove; 142. shift block; 15. first bending force plate; 151. first fixed axis; 152. slide groove; 153. slider; 154. first spring; 155. bolt; 16. second bending force plate; 161. second fixed axis; 21. light force application station; 22. heavy force application station; 31. first verification station; 311. first sealing block; 32. second verification station; 321. second sealing block; 33. air pipe; 34. second spring; 35. joint; 4. stripping plate; 41. connecting arm. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0032] Example 1: Reference Figure 1-Figure 7 A device for testing the annular fracture toughness of a PTFE thin-walled pipe comprises a mounting frame 1, and further comprises: a conveyor belt 11 rotatably arranged on the mounting frame 1, a limiting frame 12 is fixedly connected to the outer side of the conveyor belt 11, and the conveyor belt 11 is provided with three to effectively support the length direction of the test pipe 13; three turntables 14 are respectively rotatably connected to the mounting frame 1, two force-bearing areas 140 are formed between the multiple turntables 14, and eight snap-in grooves 141 are opened on the circumference of the turntable 14; a light force applying station 21 and a heavy force applying station 22, the light force applying station 21 is horizontal with the conveyor belt 11, and the heavy force applying station 22 is 90 degrees with the light force applying station 21; a first verification station 31, The second verification station 32 and the first verification station 31 are located between the light force application station 21 and the heavy force application station 22, and the angle between the second verification station 32 and the heavy force application station 22 is 45 degrees; the test pipe 13 is placed on the limit frame 12, and the conveyor belt 11 conveys the test pipe 13 to the rotating turntable 14, and the test pipe 13 is inserted into the insertion groove 141 on the turntable 14, so that when the test pipe 13 passes through the light force application station 21 and the heavy force application station 22 in sequence, a bending force is applied to the test pipe 13 at the force-bearing area 140; and when the test pipe 13 passes through the first verification station 31 and the second verification station 32 in sequence, the test pipe 13 is subjected to airtight fracture verification;

[0033] A first fixed shaft 151 is provided on the mounting frame 1 at the light force application station 21, and a plurality of first bending force application plates 15 are fixedly connected to the first fixed shaft 151. The plurality of first bending force application plates 15 are respectively located in the force-bearing area 140, and the outer circle of the first bending force application plates 15 extends into the outer circle of the rotating disk 14;

[0034] A second fixed shaft 161 is provided on the mounting frame 1 located at the gravity force applying station 22, and a plurality of second curved force applying plates 16 are fixedly connected to the second fixed shaft 161. The plurality of second curved force applying plates 16 are respectively located in the force bearing area 140, and the outer circle of the second curved force applying plates 16 extends into the outer circle of the rotating disk 14;

[0035] The conveyor belt 11 and the turntable 14 are driven by a motor;

[0036] When the device is in use, the test tubes 13 are placed one by one in the limiting frame 12 on the conveyor belt 11 manually or by a robot, and the limiting frame 12 limits the test tubes 13 so that the distances between the test tubes 13 on the conveyor belt 11 are the same;

[0037] Driven by the motor, the conveyor belt 11 and the turntable 14 rotate, and the turntable 14 rotates intermittently through the motor. When the conveyor belt 11 moves toward the turntable 14 with the test tube 13, the insertion groove 141 on the turntable 14 corresponds to the test tube 13, so that the test tube 13 is inserted into the insertion groove 141 and then connected to the turntable 14.

[0038] Then, as the turntable 14 rotates, the test pipe 13 inserted into the groove 141 will first reach the first bending force application plate 15 located at the light force application station 21, and the turntable 14 stops rotating at this time; and the outer circle of the first bending force application plate 15 extends less into the outer circle of the turntable 14, so when the test pipe 13 passes through the first bending force application plate 15, the test pipe 13 will be slightly bent, and then a light circumferential fracture toughness test will be performed;

[0039] The stop time of the turntable 14 can be set. When the set time is reached, the turntable 14 starts to continue rotating, so that the test pipe 13 for the mild circumferential fracture toughness test reaches the first verification station 31, and stops rotating again. When the test pipe 13 reaches the first verification station 31, both ends of the test pipe 13 are blocked, and air is inflated into the test pipe 13, and the value of the pressure gauge or air pressure sensor is observed to verify whether there are cracks in the test pipe 13 after the mild circumferential fracture toughness test;

[0040] After the test pipe 13 completes the circumferential fracture toughness verification test at the first verification station 31, the turntable 14 continues to drive the test pipe 13 to rotate counterclockwise, and then reaches the gravity force application station 22. The outer circle of the second bending force application plate 16 at the gravity force application station 22 extends more toward the inner circle of the outer circle of the turntable 14. Therefore, when the test pipe 13 contacts the second bending force application plate 16, the bending degree of the test pipe 13 increases, so that the test pipe 13 can be subjected to a heavy circumferential fracture toughness test;

[0041] When the stop time of the turntable 14 reaches the set time, the turntable 14 continues to rotate counterclockwise, so that the test pipe 13 after the severe circumferential fracture toughness test reaches the second verification station 32, and stops rotating again. When the test pipe 13 reaches the second verification station 32, both ends of the test pipe 13 will be blocked. In the same way as the test at the first verification station 31, air is inflated into the test pipe 13, and the value of the pressure gauge or pressure sensor is observed to verify whether there are cracks in the test pipe 13 after the severe circumferential fracture toughness test, so as to verify whether the test pipe 13 meets the test requirements of severe circumferential fracture toughness.

[0042] Therefore, the device is equipped with a conveyor belt 11 and cooperates with the turntable 14, and then through the light force applying station 21, the heavy force applying station 22 and the first verification station 31 and the second verification station 32, it can automatically perform a light circumferential fracture toughness test and a heavy circumferential fracture toughness test on the test pipe 13 stuck on the turntable 14, and in the process of performing the light circumferential fracture toughness test and the heavy circumferential fracture toughness test, the tests of the light circumferential fracture toughness and the heavy circumferential fracture toughness are verified respectively to verify whether the circumferential fracture toughness meets the light and heavy requirements. Therefore, the device does not require manual testing, which effectively improves the test efficiency and the uniformity of the test standards.

[0043] Example 2: Reference Figure 1-Figure 7 , a device for testing the circumferential fracture toughness of a PTFE thin-walled tube, which is basically the same as that of Example 1, and further, a slide groove 152 is provided on the mounting frame 1 at a position corresponding to the first fixed shaft 151 and the second fixed shaft 161, and a slider 153 is fixedly connected to the first fixed shaft 151 and the second fixed shaft 161, and the slider 153 is slidably connected in the slide groove 152, and the slider 153 is connected to the inner wall of the slide groove 152 through a first spring 154, and a bolt 155 is threadedly connected to the mounting frame 1, and one end of the bolt 155 penetrates into the slide groove 152, and one end of the bolt 155 abuts against the slider 153;

[0044] By rotating the bolt 155, the distance between the first fixed axis 151, the second fixed axis 161 and the central axis of the turntable 14 can be adjusted, and then the distance between the outer circle of the first bending force plate 15, the second bending force plate 16 and the outer circle of the turntable 14 can be adjusted, thereby facilitating the adjustment of the bending force applied by the first bending force plate 15, the second bending force plate 16 to the test pipe 13.

[0045] Example 3: Reference Figure 1-Figure 7 , a device for testing the circumferential fracture toughness of a PTFE thin-walled tube, which is basically the same as that of Example 2, and furthermore: a first sealing block 311 and a second sealing block 321 are symmetrically arranged on the mounting frame 1 located at the first verification station 31 and the second verification station 32, respectively, and an air pipe 33 is arranged on the first sealing block 311 and the second sealing block 321. When the test tube 13 passes through the first sealing block 311 and the second sealing block 321, respectively, the first sealing block 311 and the second sealing block 321 are respectively in close contact with the two ends of the test tube 13, and air is inflated into the test tube 13 to perform airtight fracture verification;

[0046] The air pipe 33 is slidably connected to the mounting frame 1, the first sealing block 311, the second sealing block 321 and the mounting frame 1 are connected via a second spring 34, the rotating disk 14 is located at both sides of the snap-in groove 141 and is fixedly connected with a shifting block 142, and the shifting block 142 is located on the outer side of the rotating disk 14 near the mounting frame 1;

[0047] When the turntable 14 rotates, the shifting block 142 at the location of the card slot 141 near the first sealing block 311 and the second sealing block 321 will enter between the first sealing block 311 and the second sealing block 321 and the outer side of the turntable 14, so that the first sealing block 311 and the second sealing block 321 are pushed away from the outer side of the turntable 14, and when the card slot 141 is coaxial with the first sealing block 311 or the second sealing block 321, the shifting blocks 142 on both sides of the card slot 141 do not contact the first sealing block 311 or the second sealing block 321, so that the first sealing block 311 or the second sealing block 321 is in close contact with the end surface of the test pipe 13, thereby achieving the blocking of both ends of the test pipe 13, and then inflating the test pipe 13 through the air pipe 33 to test the air tightness of the test pipe 13 after the light and heavy annular fracture toughness tests;

[0048] A joint 35 is installed on the air pipe 33 to facilitate connection with an external pipeline, and a pressure gauge and a pressure sensor are installed on the external pipeline.

[0049] Example 4: Reference Figure 1-Figure 7 , a device for testing the annular fracture toughness of a PTFE thin-walled pipe, which is basically the same as that of Example 3, and furthermore: a stripping plate 4 is fixedly connected to the mounting frame 1 through a connecting arm 41, the stripping plate 4 is inclined, and one end of the stripping plate 4 close to the turntable 14 extends toward the inner circle of the turntable 14;

[0050] After the test tube 13 passes through the second verification station 32, the test tube 13 contacts the upper surface of the stripping plate 4, so that the test tube 13 in the slot 141 is disengaged from the slot 141 and completes the automatic material removal function along the stripping plate 4, and then the tested test tube 13 needs to be removed from the turntable 14 manually or by a robot.

[0051] Example 5: Reference Figure 1-Figure 7 A test method for testing the annular fracture toughness of PTFE thin-walled pipes mainly includes the following steps:

[0052] S1, placing the test tube 13 on the limiting frame 12 on the conveyor belt 11, the conveyor belt 11 drives the test tube 13 to approach the rotating turntable 14, and then the test tube 13 on the limiting frame 12 is clamped into the clamping groove 141 under the rotation of the turntable 14;

[0053] S2, the turntable 14 rotates to bring the test pipe 13 to the first bending force application plate 15 to perform a mild circumferential fracture toughness test;

[0054] S3, then taking the test pipe 13 to the first verification station 31 to perform airtight fracture verification after the mild circumferential fracture toughness test;

[0055] S4, the turntable 14 continues to bring the test pipe 13 to the second bending force application plate 16 for a heavy circumferential fracture toughness test;

[0056] S5. Then, the test pipe 13 is brought to the second verification station 32 to perform airtight fracture verification after the severe circumferential fracture toughness test. After the test is completed, the material is removed through the stripping plate 4 under the rotation of the turntable 14.

[0057] The present invention sets a conveyor belt 11 and cooperates with a turntable 14, and then sets a light force applying station 21, a heavy force applying station 22, a first verification station 31, and a second verification station 32, so that the test pipe 13 stuck on the turntable 14 can be automatically tested for a light circumferential fracture toughness test and a heavy circumferential fracture toughness test, and in the process of performing the light circumferential fracture toughness test and the heavy circumferential fracture toughness test, the tests of the light circumferential fracture toughness and the heavy circumferential fracture toughness are verified respectively to verify whether the circumferential fracture toughness meets the light and heavy requirements. Therefore, the device does not require manual testing, and effectively improves the test efficiency and the uniformity of the test standards.

[0058] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the present invention can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A device for testing the annular fracture toughness of a PTFE thin-walled tube, comprising a mounting frame (1), characterized in that: Also includes: A conveyor belt (11) is rotatably mounted on the mounting frame (1), wherein a limiting frame (12) is fixedly connected to the outer side of the conveyor belt (11); A plurality of rotating disks (14) are rotatably connected to the mounting frame (1), a force-bearing area (140) is formed between the plurality of rotating disks (14), and a plurality of snap-in grooves (141) are provided on the circumference of the rotating disks (14); A light force applying station (21) and a heavy force applying station (22), wherein the light force applying station (21) and the conveyor belt (11) are in a horizontal state, and the heavy force applying station (22) and the light force applying station (21) are at 90 degrees; A first fixed shaft (151) is provided on the mounting frame (1) located at the light force application station (21), and a plurality of first curved force application plates (15) are fixedly connected to the first fixed shaft (151). The plurality of first curved force application plates (15) are respectively located in the force-bearing area (140), and the outer circle of the first curved force application plates (15) extends into the outer circle of the rotating disk (14); A second fixed shaft (161) is provided on the mounting frame (1) located at the gravity force applying station (22), and a plurality of second curved force applying plates (16) are fixedly connected to the second fixed shaft (161). The plurality of second curved force applying plates (16) are respectively located in the force bearing area (140), and the outer circle of the second curved force applying plates (16) extends into the outer circle of the rotating disk (14); a first verification station (31) and a second verification station (32), wherein the first verification station (31) is located between the light force applying station (21) and the heavy force applying station (22), and the angle between the second verification station (32) and the heavy force applying station (22) is 45 degrees; The test pipe (13) is placed on the limiting frame (12), and the conveyor belt (11) conveys the test pipe (13) to the rotating turntable (14), and the test pipe (13) is inserted into the insertion groove (141) on the turntable (14), so that when the test pipe (13) passes through the light force applying station (21) and the heavy force applying station (22) in sequence, a bending force is applied to the test pipe (13) at the force-bearing area (140); When the test pipe (13) passes through the first verification station (31) and the second verification station (32) in sequence, an airtight fracture verification is performed on the test pipe (13).

2. A device for testing the annular fracture toughness of PTFE thin-walled pipe according to claim 1, characterized in that: A slide groove (152) is provided on the mounting frame (1) at a position corresponding to the first fixed shaft (151) and the second fixed shaft (161); a slider (153) is fixedly connected to the first fixed shaft (151) and the second fixed shaft (161); the slider (153) is slidably connected in the slide groove (152); the slider (153) is connected to the inner wall of the slide groove (152) via a first spring (154); a bolt (155) is threadedly connected to the mounting frame (1); one end of the bolt (155) passes through the slide groove (152), and one end of the bolt (155) abuts against the slider (153).

3. A device for testing the annular fracture toughness of PTFE thin-walled pipe according to claim 1, characterized in that: A first sealing block (311) and a second sealing block (321) are symmetrically arranged on the mounting frame (1) located at the first verification station (31) and the second verification station (32), respectively. An air pipe (33) is arranged on each of the first sealing block (311) and the second sealing block (321). When the test tube (13) passes through the first sealing block (311) and the second sealing block (321) respectively, the first sealing block (311) and the second sealing block (321) are respectively tightly attached to the two ends of the test tube (13), and air is inflated into the test tube (13) to perform airtight fracture verification.

4. A device for testing the annular fracture toughness of PTFE thin-walled pipe according to claim 3, characterized in that: The air pipe (33) is slidably connected to the mounting frame (1); the first sealing block (311), the second sealing block (321) and the mounting frame (1) are connected via a second spring (34); the rotating disk (14) is fixedly connected with shifting blocks (142) on both sides of the snap-in groove (141); the shifting blocks (142) are located on the outer side of the rotating disk (14) near the mounting frame (1).

5. The device for testing the annular fracture toughness of PTFE thin-walled pipe according to claim 3, characterized in that: A joint (35) is installed on the air pipe (33).

6. A device for testing the annular fracture toughness of PTFE thin-walled pipe according to claim 5, characterized in that: A stripping plate (4) is fixedly connected to the mounting frame (1) via a connecting arm (41); the stripping plate (4) is inclined, and one end of the stripping plate (4) close to the rotating disk (14) extends toward the inner circle of the rotating disk (14).

7. The device for testing the annular fracture toughness of PTFE thin-walled pipe according to claim 1, characterized in that: The conveyor belt (11) and the turntable (14) are both driven by a motor.

8. A method for testing the annular fracture toughness of a PTFE thin-walled tube, comprising the device for testing the annular fracture toughness of a PTFE thin-walled tube according to claim 6, characterized in that: The main steps include: S1, placing the test tube (13) on a limiting frame (12) on a conveyor belt (11), the conveyor belt (11) drives the test tube (13) to approach a rotating turntable (14), and then the test tube (13) on the limiting frame (12) is clamped into the clamping groove (141) under the rotation of the turntable (14); S2, the turntable (14) rotates to bring the test pipe (13) to the first bending force application plate (15) to perform a light circumferential fracture toughness test; S3, then bringing the test pipe (13) to the first verification station (31) to perform airtight fracture verification after a mild circumferential fracture toughness test; S4, the turntable (14) continues to bring the test pipe (13) to the second bending force application plate (16) to perform a heavy circumferential fracture toughness test; S5. The test pipe (13) is then brought to the second verification station (32) to perform airtight fracture verification after the heavy circumferential fracture toughness test. After the test is completed, the pipe is removed through the stripping plate (4) under the rotation of the turntable (14).

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