Bending fatigue testing machine

Abstract

The invention relates to a bending fatigue testing machine which comprises a testing system and a pressure and temperature control system, the testing system comprises two horizontally-placed and oppositely-arranged water channel blocks and a blood vessel bending mechanism located between the two water channel blocks, and a plurality of simulation blood vessels are connected between the two water channel blocks; the blood vessel bending mechanism comprises a plurality of groups of bending modules corresponding to the simulated blood vessels, each bending module comprises a male die and a female die which are oppositely arranged, and the simulated blood vessels penetrate through the corresponding male dies and female dies so as to be bent through the male dies and the female dies; a water outlet of the pressure and temperature control system is communicated with one water channel block through a water pump, and a water return port is communicated with the other water channel block to form a test circulation loop with the test system. The simulation blood vessel is bent in a horizontal pushing mode, the problem that a test sample slides in the simulation blood vessel can be effectively avoided, curvature reducing of the simulation blood vessel can be accurately controlled, and the accuracy and effectiveness of a test result are guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of fatigue testing equipment, and in particular relates to a bending fatigue testing machine. Background Art

[0002] At present, vascular stent intervention surgery is the main means of treating cardiovascular diseases, and the performance of vascular stents is an important factor in determining the effectiveness of surgery. Before vascular stents are put into use, their bending fatigue performance needs to be simulated in vitro, that is, the service life of vascular stents with different structures in the human body is predicted through simulation test results.

[0003] The existing bending fatigue testing machine has a large overall size and is inconvenient to install and use. There are two specific types:

[0004] The first method is to place the vascular stent to be tested (hereinafter referred to as the test sample) in a simulated blood vessel, and drive the simulated blood vessel to bend by rotating the swing arm. The center of gravity of the swing arm is constantly changing during the swinging process, which not only affects the stability of the entire device, but also the centrifugal force of the rotation easily causes the test sample to slide in the simulated blood vessel, directly affecting the test effect;

[0005] The second method: use a block to support the middle part of the simulated blood vessel, so that one end of the simulated blood vessel rotates around the block to achieve the bending of the simulated blood vessel and the test sample inside it. This test method cannot accurately control the test parameters (curvature change) of the test sample, which directly affects the accuracy of the test results. Summary of the invention

[0006] The purpose of the invention is to provide a bending fatigue testing machine to solve the problem of poor testing effect.

[0007] A bending fatigue testing machine of the present invention is implemented as follows:

[0008] A bending fatigue testing machine, comprising

[0009] The test system comprises two waterway blocks placed horizontally and arranged opposite to each other, and a blood vessel bending mechanism located between the two waterway blocks, a plurality of simulated blood vessels are connected between the two waterway blocks, the blood vessel bending mechanism comprises a plurality of bending modules arranged corresponding to the simulated blood vessels, the bending modules comprise a convex mold and a concave mold arranged opposite to each other, the simulated blood vessels pass between the corresponding convex mold and the concave mold, and are bent by the convex mold and the concave mold;

[0010] The pressure temperature control system has a water outlet connected to one of the water channel blocks through a water pump, and a water return port connected to another water channel block to form a test circulation loop with the test system.

[0011] Furthermore, the test system also includes a base plate, on which the water channel block and the blood vessel bending mechanism are arranged side by side.

[0012] Furthermore, the water channel block is provided with a main water channel running through the length direction thereof, and the side of the main water channel is provided with a blood vessel interface correspondingly connected to each simulated blood vessel.

[0013] Furthermore, a convex arc groove is provided on the side of the male mold facing the corresponding female mold, and a concave arc groove is provided on the side of the female mold facing the corresponding male mold. The convex arc groove and the concave arc groove match each other, and the curvature radius of the two are the same.

[0014] Furthermore, the male and female dies in the same group can be moved closer or farther away.

[0015] Furthermore, the female mold is mounted on a fixed bracket, a screw rod is arranged in the fixed bracket, a sliding bracket is arranged on the screw rod slider of the screw rod, the male mold is mounted on the sliding bracket, and the sliding bracket can synchronously drive each male mold to move toward or away from the corresponding female mold;

[0016] One end of the screw rod is connected with a motor.

[0017] Further, one of the waterway blocks can be moved toward or away from the other waterway block;

[0018] A slide rail is arranged below one of the water channel blocks, and a first sliding block slidably matched on the slide rail is arranged at the bottom of the water channel block.

[0019] Further, the blood vessel bending mechanism can translate between the two water channel blocks;

[0020] A slide rail is arranged below the blood vessel bending mechanism, and a second sliding block slidably matched on the slide rail is arranged at the bottom of the blood vessel bending mechanism.

[0021] Further, a pressure sensor is installed on one of the waterway blocks, and a temperature sensor is installed on the other waterway block;

[0022] A Luer connector is installed on the waterway block.

[0023] Furthermore, the pressure and temperature control system comprises a tank body, and a pressure relief valve, a liquid filling port and a liquid filling port are arranged on the top of the tank body.

[0024] After adopting the above technical solution, the present invention has the following beneficial effects:

[0025] (1) The present invention has a small overall volume and a simple structure. Its test system is arranged in a horizontal manner, which is not only convenient for early installation, but also makes observation and measurement operations during the test more convenient;

[0026] (2) In the present invention, the simulated blood vessel is bent by horizontally pushing the simulated blood vessel in cooperation with the concave mold and the convex mold, which can not only effectively avoid the problem of sliding of the test sample in the simulated blood vessel, but also accurately control the curvature change of the simulated blood vessel, thereby ensuring the accuracy and effectiveness of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0028] Figure 1 is a structural diagram of a bending fatigue testing machine according to a preferred embodiment of the present invention;

[0029] Figure 2 is a front view of a bending fatigue testing machine according to a preferred embodiment of the present invention;

[0030] Figure 3 is a top view of a bending fatigue testing machine according to a preferred embodiment of the present invention;

[0031] Figure 4 is a structural diagram of a first water channel block portion of a bending fatigue testing machine according to a preferred embodiment of the present invention;

[0032] Figure 5 It is a left view of the first water channel block of the bending fatigue testing machine according to the preferred embodiment of the present invention;

[0033] Figure 6 yes Figure 5 Sectional view of the AA section;

[0034] Figure 7 is a structural diagram of a blood vessel bending mechanism of a bending fatigue testing machine according to a preferred embodiment of the present invention;

[0035] Figure 8 It is a structural diagram of a blood vessel bending mechanism (without a concave die, a convex die and a hidden U-shaped plate in the middle) of a bending fatigue testing machine according to a preferred embodiment of the present invention;

[0036] Fig. 9 It is a structural diagram of a pressure and temperature control system of a bending fatigue testing machine according to a preferred embodiment of the present invention;

[0037] In the figure:

[0038] Simulated blood vessel 1, punch 2, die 3, water pump 4, first water channel block 5, second water channel block 6, first water pipe 7, second water pipe 8, bottom plate 9, support 10, foot 11, handle 12, main water channel 13, blood vessel interface 14, water outlet 15, water return port 16, blood vessel joint 17, adapter 18, convex arc groove 19, concave arc groove 20, fixed bracket 21, lower plate 21-1, U-shaped plate 21-2, avoidance window 21-3, screw 2 2, screw slider 23, sliding bracket 24, linear guide 25, slide seat 26, motor 27, slide rail 28, first slider 29, guide groove 30, first locking block 31, first locking plate 32, first locking bolt 33, second slider 34, second locking block 35, second locking plate 36, second locking bolt 37, pressure sensor 38, temperature sensor 39, Luer connector 40, tank body 41, pressure relief valve 42, pressurization port 43, cover 44. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] like Figure 1-9 As shown, a bending fatigue testing machine includes a testing system and a pressure-temperature control system. The testing system includes two waterway blocks placed horizontally and arranged opposite to each other, and a blood vessel bending mechanism located between the two waterway blocks. A plurality of simulated blood vessels 1 are connected between the two waterway blocks. The blood vessel bending mechanism includes a plurality of bending modules arranged corresponding to the simulated blood vessels 1. The bending modules include relatively arranged convex dies 2 and concave dies 3. The simulated blood vessels 1 pass between the corresponding convex dies 2 and concave dies 3 so as to be bent by the convex dies 2 and concave dies 3. The water outlet 15 of the pressure-temperature control system is connected to one of the waterway blocks through a water pump 4, and the water return port 16 is connected to the other waterway block so as to form a testing circulation loop with the testing system.

[0042] Among them, the water outlet 15 of the pressure and temperature control system is connected to the first water channel block 5 through the first water pipe 7, and a water pump 4 is arranged on the first water pipe 7. The second water channel block 6 is connected to the return water port 16 of the pressure and temperature control system through the second water pipe 8, so that the test liquid flows out of the pressure and temperature control system, passes through the first water pipe 7, the first water channel block 5, the simulated blood vessel 1, the second water channel block 6 and the second water pipe 8 in sequence, and then flows back to the pressure and temperature control system to form a test circulation loop.

[0043] Preferably, the water pump 4 is a peristaltic pump, which does not need to contact the test liquid to ensure the accuracy of the test result.

[0044] In order to realize the installation of components such as the test water channel block, the test system further comprises a bottom plate 9, on which the water channel block and the blood vessel bending mechanism are arranged side by side.

[0045] Among them, the two water channel blocks are arranged side by side horizontally (left and right), the blood vessel bending mechanism is located between the two water channel blocks, and each bending module is arranged side by side longitudinally (front and back), and the pressure and temperature control system and the water pump 4 are located on the rear side of the test system.

[0046] Preferably, in order to keep the water channel block and the bending module level, a support 10 is provided at the bottom of the water channel block.

[0047] Preferably, handles 12 are provided at both ends of the upper surface of the bottom plate 9 to facilitate the movement of the entire test system.

[0048] Preferably, a foot 11 is provided at the bottom of the base plate 9, which can not only reduce shock but also have a certain friction force, so as to ensure the stability of the test system during the test and prevent it from moving randomly.

[0049] In order to form a passage between the water channel block and the simulated blood vessel 1 , a main water channel 13 running through the length direction of the water channel block is provided in the water channel block, and a blood vessel interface 14 corresponding to each simulated blood vessel 1 is provided on the side of the main water channel 13 .

[0050] Specifically, the water channel blocks are placed longitudinally (front and back direction), the rear end of the main water channel 13 of the first water channel block 5 is connected to the water outlet 15 of the pressure and temperature control system through the first water pipe 7, and the rear end of the main water channel 13 of the second water channel block 6 is connected to the return water port 16 of the pressure and temperature control system through the second water pipe 8.

[0051] The blood vessel interface 14 is located on opposite sides of the two waterway blocks, and the two opposite blood vessel interfaces 14 on the two waterway blocks are used to connect the two ends of the same simulated blood vessel 1. Specifically, a blood vessel connector 17 is installed at the end of the simulated blood vessel 1, and an adapter 18 is installed on the blood vessel interface 14, and the blood vessel connector 17 is assembled on the adapter 18.

[0052] In order to be able to bend the simulated blood vessel 1 to a desired curvature change through the cooperation of the same group of the punch 2 and the die 3, a convex arc groove 19 is provided on the side of the punch 2 facing the corresponding die 3, and a concave arc groove 20 is provided on the side of the die 3 facing the corresponding punch 2. The convex arc groove 19 and the concave arc groove 20 cooperate with each other, and the curvature radius of the two are the same.

[0053] Among them, the convex arc groove 19, that is, the overall shape of the arc groove is convex toward the direction of the die 3, and the concave arc groove 20, that is, the shape of the arc groove is concave toward the direction away from the punch 2. The convex arc groove 19 and the concave arc groove 20 cooperate to form an arc channel with a fixed curvature diameter change, simulating the blood vessel 1 passing through the arc channel, that is, bending into a fixed curvature diameter change, and then the bending fatigue test can be carried out on the curvature radius.

[0054] In order to facilitate the coordination between the simulated blood vessel 1 and the corresponding bending module, the male mold 2 and the female mold 3 in the same group can be close to or far away from each other.

[0055] Before the test, the convex mold 2 and the concave mold 3 of the same group can be separated by a certain distance to facilitate the passage of the simulated blood vessel 1 between the two. After the simulated blood vessel 1 is installed, the convex mold 2 and the corresponding concave mold 3 can be brought close to each other and matched to achieve the bending of the simulated blood vessel 1.

[0056] In this embodiment, the approach or distance between the two is achieved by fixing the die 3 and moving the punch 2. Specifically, the die 3 is mounted on a fixed bracket 21, a screw rod 22 is provided in the fixed bracket 21, a sliding bracket 24 is provided on the screw slider 23 of the screw rod 22, and the punch 2 is mounted on the sliding bracket 24. The sliding bracket 24 can synchronously drive each punch 2 to move toward or away from the corresponding die 3.

[0057] Among them, the fixed bracket 21 includes a lower plate 21-1, and a plurality of U-shaped plates 21-2 with openings facing downward fixed on the lower plate 21-1, an avoidance window 21-3 is provided on the top plate of the U-shaped plate 21-2, the die 3 is fixed on both sides of the avoidance window 21-3 on the top plate of the U-shaped plate 21-2, the screw rod 22 is arranged longitudinally and is located in the fixed bracket 21 (fixed on the lower plate 21-1), the sliding bracket 24 is a T-shaped frame and is also located in the fixed bracket 21 (in the cavity formed by the lower plate 21-1 and the U-shaped plate 21-2), each punch 2 is fixed on the top plate of the sliding bracket 24, and is located between two adjacent U-shaped plates 21-2 or in the avoidance window 21-3 on the top of the U-shaped plate 21-2 to cooperate with the corresponding die 3.

[0058] In this embodiment, three U-shaped plates 21 - 2 are provided, and six groups of combinations of the male mold 2 and the female mold 3 are provided.

[0059] By rotating the screw 22 , the screw slider 23 can drive each punch 2 to move toward or away from the corresponding die 3 .

[0060] Preferably, a linear guide rail 25 parallel to the screw rod 22 is provided below the screw rod 22, and a slide seat 26 slidably fitted on the linear guide rail 25 is provided at the bottom of the screw rod slider 23. The cooperation between the linear guide rail 25 and the slide seat 26 can guide the movement of the screw rod slider 23 and the sliding bracket 24 to ensure their stability during movement.

[0061] In order to drive the screw rod 22 to rotate, a motor 27 is connected to one end of the screw rod 22 .

[0062] In this embodiment, the motor 27 is installed in the fixing bracket 21 and connected to the rear end of the screw rod 22 .

[0063] In order to accommodate simulated blood vessels 1 of different lengths, one of the waterway blocks can be moved toward or away from another waterway block.

[0064] In this embodiment, the second water channel block 6 is fixed and the first water channel block 5 is movable, that is, the first water channel block 5 can move toward or away from the second water channel block 6 according to the length of the simulated blood vessel 1 required for the test.

[0065] In addition to the above-mentioned manner, the second water channel block 6 can also be configured to be movable and the first water channel block 5 can be configured to be fixed as required.

[0066] In order to guide the movement of the first water channel block 5 , a slide rail 28 is provided below one of the water channel blocks, and a first slider 29 slidably fitted on the slide rail 28 is provided at the bottom of the water channel block.

[0067] In this embodiment, the slide rail 28 is a transverse slide rail 28 and two are provided. The first slider 29 is installed at the bottom of the support 10 below the first water channel block 5. The first slider 29 moves on the slide rail 28 to drive the first water channel block 5 to move transversely.

[0068] A guide groove 30 is provided between the two slide rails 28 and is located on the bottom plate 9 and parallel to the slide rail 28. A first locking block 31 that can move in the guide groove 30 is installed on the guide groove 30. A first locking plate 32 located above the first locking block 31 is provided on the inner side of the support 10 below the first water channel block 5. A first locking bolt 33 is provided on the first locking plate 32. When the first water channel block 5 is moved into place, the first locking bolt 33 can be tightened downward to fix the position of the first water channel block 5.

[0069] If the position of the first water channel block 5 needs to be moved, the first locking bolt 33 can be loosened.

[0070] The first locking block 31 has a T-shaped cross section, including a block body located above the bottom plate 9, and a slide bar slidably fitted in the guide groove 30. The first locking plate 32 is provided with a threaded hole for installing the first locking bolt 33, and the block body of the first locking block 31 is provided with a blind hole opposite to the threaded hole. The first locking plate 32 can limit the first locking block 31 so that it cannot escape upward from the guide groove 30. When the first locking bolt 33 is tightened downward, the first locking bolt 33 moves downward and extends into the blind hole, and its lower end abuts against the bottom of the blind hole and gradually presses down the first locking block 31, thereby pressing the first locking block 31 against the bottom plate 9, and pressing the first locking plate 32 against the first locking block 31, thereby fixing the position of the first water channel block 5.

[0071] The simulated blood vessels 1 of different lengths have different placement positions of the test samples during the test. Therefore, in order to adapt to this change, the blood vessel bending mechanism can be translated between the two water channel blocks.

[0072] The vessel bending mechanism is capable of lateral movement between the two waterway blocks.

[0073] In order to guide the movement of the blood vessel bending mechanism, a slide rail 28 is provided below the blood vessel bending mechanism, and a second slider 34 slidably fitted on the slide rail 28 is provided at the bottom of the blood vessel bending mechanism.

[0074] In this embodiment, the slide rail 28 is the slide rail 28 that the first water channel block 5 moves with, and the second slider 34 is installed at the bottom of the fixed bracket 21. The movement of the first slider 29 on the slide rail 28 drives the lateral movement of the entire blood vessel bending mechanism.

[0075] A second locking block 35 is provided on the guide groove 30, and a second locking plate 36 located above the second locking block 35 is provided on one side of the fixed bracket 21. The second locking plate 36 is provided with a second locking bolt 37 connecting the second locking plate 36 and the second locking block 35. When the blood vessel bending mechanism is moved into place, the second locking bolt 37 is tightened to fix the position of the blood vessel bending mechanism.

[0076] The shape and locking principle of the second locking block 35 are the same as those of the first locking block 31 .

[0077] In order to monitor the temperature and pressure of the test liquid in the test system in real time during the test, a pressure sensor 38 is installed on one of the waterway blocks, and a temperature sensor 39 is installed on the other waterway block.

[0078] In this embodiment, the pressure sensor 38 is installed at the end of the main water channel 13 at the front end of the first water channel block 5, and the temperature sensor 39 is installed at the end of the main water channel 13 at the front end of the second water channel block 6.

[0079] The positions of the pressure sensor 38 and the temperature sensor 39 may be interchanged as required.

[0080] In order to quickly discharge the air in the main water channel 13 when injecting the test liquid into the test system, a Luer connector 40 is installed on the water channel block.

[0081] Preferably, a Luer connector 40 is provided at a position corresponding to each blood vessel interface 14 , so as to facilitate exhausting the air in the simulated blood vessel 1 .

[0082] The pressure and temperature control system is used to provide the test system with the test liquid of the required temperature and pressure, so the pressure and temperature control system includes a tank body 41, and the top of the tank body 41 is provided with a pressure relief valve 42, a pressurizing port 43 and a liquid filling port.

[0083] Specifically, the tank body 41 includes an upper cover, a lower cover and a tank body 41 main body located between the upper cover and the lower cover. The water outlet 15 is located on the side of the lower cover, and the water return port 16 is located on the side of the upper cover.

[0084] The pressure relief valve 42 is arranged on the upper cover. When the pressure in the entire testing machine is too high, the pressure can be relieved through the pressure relief valve 42.

[0085] The pressurizing port 43 is provided on the upper cover. When the pressure in the testing machine is too low, pressurization can be performed through the pressurizing port 43 .

[0086] The liquid adding port is arranged on the upper cover, and is used for adding the test liquid into the tank body 41 ; the liquid adding port is provided with a sealing cover 44 , and the liquid adding port can be closed when no liquid needs to be added.

[0087] Preferably, a heater (not shown) is also provided in the tank body 41 to heat the test liquid to meet the test requirements.

[0088] In addition, a liquid level sensor (not shown) may be provided in the tank body 41 to detect changes in the liquid level in the tank body 41 in real time, so as to facilitate timely replenishment of the test liquid.

[0089] When testing the test sample, the test sample is loaded into the corresponding simulated blood vessel 1, and the simulated blood vessel 1 is connected between two water channel blocks. The simulated blood vessel 1 at the position of the test sample is then bent using the blood vessel bending mechanism. At this time, the test sample in the simulated blood vessel 1 follows the bending of the simulated blood vessel 1 to reach a predetermined curvature. The test liquid is then injected into the test system using a pressure and temperature control system, and the test sample can be subjected to a bending test.

[0090] The present invention is small in size, light in weight, and easy to install and arrange. It is arranged flat as a whole, and bends the simulated blood vessel 1 by horizontal movement (i.e., the punch 2 moves toward the die 3). The center of gravity is stable, which can not only avoid the problem of the test sample sliding in the simulated blood vessel 1, but also accurately control the curvature change of the test sample, effectively ensuring the accuracy and effectiveness of the test results.

[0091] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A bending fatigue testing machine, characterized in that: include The test system comprises two waterway blocks placed horizontally and arranged opposite to each other, and a blood vessel bending mechanism located between the two waterway blocks, a plurality of simulated blood vessels (1) being connected between the two waterway blocks, the blood vessel bending mechanism comprising a plurality of bending modules arranged corresponding to the simulated blood vessels (1), the bending modules comprising a convex mold (2) and a concave mold (3) arranged opposite to each other, the simulated blood vessel (1) passing between the corresponding convex mold (2) and concave mold (3) so as to be bent by the convex mold (2) and the concave mold (3); The pressure temperature control system has a water outlet (15) connected to one of the water channel blocks through a water pump (4), and a water return port (16) connected to another water channel block to form a test circulation loop with the test system.

2. The bending fatigue testing machine according to claim 1, characterized in that: The test system further comprises a bottom plate (9), on which the water channel block and the blood vessel bending mechanism are arranged side by side.

3. The bending fatigue testing machine according to claim 1, characterized in that: The water channel block is provided with a main water channel (13) running through the water channel block in its length direction, and a blood vessel interface (14) correspondingly connected to each simulated blood vessel (1) is provided on the side of the main water channel (13).

4. The bending fatigue testing machine according to claim 1, characterized in that: The side of the male mold (2) facing the corresponding female mold (3) is provided with a convex arc groove (19), and the side of the female mold (3) facing the corresponding male mold (2) is provided with a concave arc groove (20). The convex arc groove (19) and the concave arc groove (20) match each other, and the curvature radius of the two is the same.

5. The bending fatigue testing machine according to claim 1, characterized in that: The male mold (2) and female mold (3) of the same group can be moved closer to or farther away from each other.

6. The bending fatigue testing machine according to claim 5, characterized in that: The female mold (3) is mounted on a fixed bracket (21), a screw rod (22) is arranged inside the fixed bracket (21), a sliding bracket (24) is arranged on a screw rod slider (23) of the screw rod (22), the male mold (2) is mounted on the sliding bracket (24), and the sliding bracket (24) can synchronously drive each male mold (2) to move toward or away from the corresponding female mold (3); One end of the screw rod (22) is connected to a motor (27).

7. The bending fatigue testing machine according to claim 1, characterized in that: One of the waterway blocks can be moved towards or away from the other waterway block; A slide rail (28) is arranged below one of the water channel blocks, and a first sliding block (29) which is slidably matched on the slide rail (28) is arranged at the bottom of the water channel block.

8. The bending fatigue testing machine according to claim 1, characterized in that: The blood vessel bending mechanism can translate between two water channel blocks; A slide rail (28) is arranged below the blood vessel bending mechanism, and a second sliding block (34) slidably matched on the slide rail (28) is arranged at the bottom of the blood vessel bending mechanism.

9. The bending fatigue testing machine according to claim 1, characterized in that: A pressure sensor (38) is installed on one of the waterway blocks, and a temperature sensor (39) is installed on the other waterway block; A Luer connector (40) is installed on the waterway block.

10. The bending fatigue testing machine according to claim 1, characterized in that: The pressure and temperature control system comprises a tank body (41), and a pressure relief valve (42), a pressurizing port (43) and a liquid filling port are arranged on the top of the tank body (41).

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