Bending fatigue testing machine

Abstract

The utility model relates to a flexural fatigue testing machine which comprises a testing system and a pressure 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 solved, the curvature variable diameter 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 utility model belongs to the technical field of fatigue test equipment, and particularly relates to a bending fatigue testing machine. BACKGROUND

[0002] At present, vascular stent intervention surgery is a main means for treating cardiovascular diseases, and the performance of the vascular stent is an important factor determining the effect of the surgery. Before the vascular stent is put into use, the bending fatigue performance thereof needs to be simulated in vitro, that is, the service life of the vascular stent 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, and specifically has two forms.

[0004] The first form is that the vascular stent to be tested (hereinafter referred to as a test sample) is placed in a simulated blood vessel, the simulated blood vessel is bent by a swing arm, the center of gravity of the swing arm changes constantly in the swinging process, which not only affects the stability of the whole equipment, but also easily causes the test sample to slide in the simulated blood vessel due to centrifugal force, directly affecting the test effect.

[0005] The second form is that a stopper is used to push against the middle part of the simulated blood vessel, and one end of the simulated blood vessel is rotated around the stopper to realize the bending of the simulated blood vessel and the test sample in the simulated blood vessel. This test method cannot accurately control the test parameters (curvature change) of the test sample, directly affecting the accuracy of the test results. INVENTION CONTENTS

[0006] The utility model aims at providing a bending fatigue testing machine to solve the problem of poor test effect.

[0007] The bending fatigue testing machine of the utility model is implemented as follows:

[0008] A bending fatigue testing machine comprises

[0009] A test system comprises two water channel blocks arranged horizontally and oppositely, and a blood vessel bending mechanism between the two water channel blocks, a plurality of simulated blood vessels are connected between the two water channel blocks, the blood vessel bending mechanism comprises a plurality of bending modules corresponding to the simulated blood vessels, the bending module comprises a convex die and a concave die arranged oppositely, the simulated blood vessel passes between the corresponding convex die and concave die to be bent by the convex die and concave die;

[0010] A pressure and temperature control system, a water outlet of the pressure and temperature control system is communicated with one of the water channel blocks 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.

[0011] Further, the test system further comprises a base plate, and the water channel blocks and the blood vessel bending mechanism are arranged side by side on the base plate.

[0012] Further, a main water channel penetrating through the length direction of the water channel block is arranged in the water channel block, and a blood vessel interface corresponding to each simulated blood vessel is arranged on the side of the main water channel.

[0013] Further, a convex arc-shaped groove is arranged on the side of the male die facing the corresponding female die, and a concave arc-shaped groove is arranged on the side of the female die facing the corresponding male die, the convex arc-shaped groove and the concave arc-shaped groove are matched, and the curvature radii of the two arc-shaped grooves are the same.

[0014] Further, the male dies and the female dies in the same group can be close to or away from each other.

[0015] Further, the female die is mounted on a fixed support, a lead screw is arranged in the fixed support, a sliding support is arranged on the lead screw sliding block of the lead screw, and the male die is mounted on the sliding support, the sliding support can synchronously drive each male die to move towards or away from the corresponding female die;

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

[0017] Further, one of the water channel blocks can move towards or away from the other water channel block.

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

[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 is arranged on the bottom of the blood vessel bending mechanism and is slidably matched with the slide rail.

[0021] Further, a pressure sensor is mounted on one of the water channel blocks, and a temperature sensor is mounted on the other water channel block.

[0022] A luer joint is mounted on the water channel block.

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

[0024] After the above technical scheme is adopted, the present application has the following beneficial effects:

[0025] (1) The present application has small overall volume and simple structure, the test system is arranged in a horizontal manner, which is convenient for installation in the early stage and makes observation and measurement operation in the test process more convenient.

[0026] (2) The concave die and the convex die are matched to horizontally push the simulated blood vessel, so that the problem of sliding of the test sample in the simulated blood vessel can be effectively avoided, and the curvature of the simulated blood vessel can be accurately controlled, and the accuracy and effectiveness of the test result are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0027] The utility model is further described below in combination with the drawings and examples.

[0028] Figure 1 is the structure diagram of the bending fatigue testing machine of the preferred embodiment of the utility model;

[0029] Figure 2 is the front view of the bending fatigue testing machine of the preferred embodiment of the utility model;

[0030] Figure 3 is the top view of the bending fatigue testing machine of the preferred embodiment of the utility model;

[0031] Figure 4 is the structure diagram of the first water channel block part of the bending fatigue testing machine of the preferred embodiment of the utility model;

[0032] Figure 5 is the left view of the first water channel block of the bending fatigue testing machine of the preferred embodiment of the utility model;

[0033] Figure 6 is the structure diagram of the blood vessel bending mechanism of the bending fatigue testing machine of the preferred embodiment of the utility model; Figure 5 is the sectional view of A-A part in the structure diagram of the blood vessel bending mechanism of the bending fatigue testing machine of the preferred embodiment of the utility model;

[0034] Figure 7 is the structure diagram of the blood vessel bending mechanism of the bending fatigue testing machine of the preferred embodiment of the utility model;

[0035] Figure 8 is the structure diagram of the blood vessel bending mechanism (without concave die, convex die and hidden middle U-shaped plate) of the bending fatigue testing machine of the preferred embodiment of the utility model;

[0036] Figure 9 is the structure diagram of the pressure temperature control system of the bending fatigue testing machine of the preferred embodiment of the utility model;

[0037] In the drawings:

[0038] Simulated blood vessel 1, punch 2, concave mold 3, water pump 4, first water channel block 5, second water channel block 6, first water pipe 7, second water pipe 8, base plate 9, support 10, pad 11, handle 12, main water channel 13, blood vessel interface 14, water outlet 15, water return 16, blood vessel connector 17, adapter 18, convex arc groove 19, concave arc groove 20, fixed bracket 21, lower plate 21-1, U-shaped plate 21-2, clearance window 21-3, lead screw 2 2. Screw slider 23, sliding bracket 24, linear guide rail 25, slide block 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, pressure port 43, cover 44. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[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 claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0041] like Figures 1-9 As shown, a bending fatigue testing machine includes a testing system and a pressure and temperature control system. The testing system includes two horizontally placed and oppositely arranged water channel blocks, and a blood vessel bending mechanism located between the two water channel blocks. Multiple simulated blood vessels 1 are connected between the two water channel blocks. The blood vessel bending mechanism includes multiple sets of bending modules corresponding to the simulated blood vessels 1. Each bending module includes a punch 2 and a die 3 arranged opposite to each other. The simulated blood vessel 1 passes through the corresponding punch 2 and die 3 to bend it using the punch 2 and die 3. The outlet 15 of the pressure and temperature control system is connected to one of the water channel blocks through a water pump 4, and the return outlet 16 is connected to the other water channel block to form a test loop with the testing system.

[0042] The outlet 15 of the pressure temperature control system is connected with the first water channel block 5 through the first water pipe 7, the water pump 4 is arranged on the first water pipe 7, and the second water channel block 6 is connected with the water return port 16 of the pressure temperature control system through the second water pipe 8, so that the test liquid flows out from the pressure temperature control system, sequentially 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 and then flows back to the pressure temperature control system again, so as to form a test circulation loop.

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

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

[0045] Preferably, the two water channel blocks are arranged transversely and side by side (in the left-right direction), the blood vessel bending mechanism is located between the two water channel blocks, and each bending module is arranged longitudinally and side by side (in the front-rear direction), and the pressure temperature control system and the water pump 4 are located at the rear side of the test system.

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

[0047] Preferably, the upper surface of the bottom plate 9 is provided with a handle 12 at each end, so as to facilitate the movement of the entire test system.

[0048] Preferably, the bottom of the bottom plate 9 is provided with a foot pad 11, which not only can reduce vibration, but also has a certain friction force, so as to ensure the stability of the test system during the test and avoid the test system from moving randomly.

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

[0050] Specifically, the water channel block is arranged longitudinally (in the front-rear direction), the rear end of the main water channel 13 of the first water channel block 5 is connected with the water outlet 15 of the pressure 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 with the water return port 16 of the pressure temperature control system through the second water pipe 8.

[0051] The blood vessel interface 14 is located on the opposite side surface of the two water channel blocks, and the two blood vessel interfaces 14 on the two water channel blocks are used to connect two ends of the same simulated blood vessel 1. Specifically, the end of the simulated blood vessel 1 is provided with a blood vessel connector 17, the blood vessel interface 14 is provided with an adapter 18, and the blood vessel connector 17 is assembled on the adapter 18.

[0052] In order to enable the simulation blood vessel 1 to be bent to the required curvature diameter by the cooperation of the punch 2 and the die 3 in the same group, the punch 2 is provided with a convex arc-shaped groove 19 on the side facing the corresponding die 3, the die 3 is provided with a concave arc-shaped groove 20 on the side facing the corresponding punch 2, the convex arc-shaped groove 19 and the concave arc-shaped groove 20 cooperate and have the same curvature radius.

[0053] The convex arc-shaped groove 19 is convex in the direction facing the die 3, the concave arc-shaped groove 20 is concave in the direction away from the punch 2, the convex arc-shaped groove 19 and the concave arc-shaped groove 20 cooperate to form an arc-shaped channel with a fixed curvature diameter, the simulation blood vessel 1 passes through the arc-shaped channel, that is, is bent to the fixed curvature diameter, and then the bending fatigue test is performed on the curvature radius.

[0054] In order to facilitate the cooperation of the simulation blood vessel 1 and the corresponding bending module, the punch 2 and the die 3 in the same group can be close to or away from each other.

[0055] Before the test, the punch 2 and the die 3 in the same group can be separated by a certain distance, so that the simulation blood vessel 1 can pass between them, after the simulation blood vessel 1 is installed, the punch 2 and the corresponding die 3 can be close to each other and cooperate to realize the bending of the simulation blood vessel 1.

[0056] In this embodiment, the punch 2 is moved to realize the close or away of the punch 2 and the die 3, specifically, the die 3 is installed on a fixed support 21, a lead screw 22 is arranged in the fixed support 21, a sliding support 24 is arranged on the lead screw sliding block 23 of the lead screw 22, and the punch 2 is installed on the sliding support 24. The sliding support 24 can simultaneously drive each punch 2 to move towards or away from the corresponding die 3.

[0057] The fixed support 21 includes a lower plate 21-1 and a plurality of U-shaped plates 21-2 with openings downwardly fixed on the lower plate 21-1, the top plate of the U-shaped plate 21-2 is provided with an avoiding window 21-3, the die 3 is fixed on both sides of the avoiding window 21-3 of the top plate of the U-shaped plate 21-2, the lead screw 22 is arranged longitudinally in the fixed support 21 (fixed on the lower plate 21-1), the sliding support 24 is a T-shaped bracket and is also arranged in the fixed support 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 support 24 and is located between adjacent two U-shaped plates 21-2 or in the avoiding 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 arranged, and the combination of the punch 2 and the die 3 is provided with six groups.

[0059] Rotating the screw rod 22, the screw rod slider 23 can drive each male die 2 to move towards or away from the corresponding female die 3.

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

[0061] In order to provide driving for the rotation of the screw rod 22, a motor 27 is connected to one end of the screw rod 22.

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

[0063] In order to adapt to different lengths of the simulated blood vessels 1, one water channel block can move towards or away from another water channel block.

[0064] In the 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 towards or away from the second water channel block 6 according to the length of the simulated blood vessel 1 required by the test.

[0065] In addition to the above mode, the second water channel block 6 can also be set as movable and the first water channel block 5 can be set as fixed according to the needs.

[0066] In order to guide the movement of the first water channel block 5, a slide rail 28 is arranged below one water channel block, and a first sliding block 29 slidingly fitted on the slide rail 28 is arranged on the bottom of the water channel block.

[0067] In the embodiment, the slide rail 28 is a transverse slide rail 28 and two slide rails 28 are arranged. The first sliding block 29 is installed on the bottom of the support 10 below the first water channel block 5. The first water channel block 5 is driven to move transversely by the movement of the first sliding block 29 on the slide rail 28.

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

[0069] If it is needed to move the position of the first water channel block 5, the first locking bolt 33 is loosened.

[0070] The first locking block 31 is T-shaped in section, comprising a block above the bottom plate 9 and a sliding strip slidingly fitted in the guide groove 30. The first locking plate 32 is provided with a threaded hole for mounting the first locking bolt 33, and the block 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 be pulled out of the guide groove 30 upwardly. When the first locking bolt 33 is tightened downwardly, the first locking bolt 33 moves downwardly and extends into the blind hole, and the lower end of the first locking bolt 33 abuts against the bottom of the blind hole and gradually presses the first locking block 31 downwardly, so that the first locking block 31 is pressed against the bottom plate 9, and the first locking plate 32 is pressed against the first locking block 31, thereby fixing the position of the first water block 5.

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

[0072] The blood vessel bending mechanism can move laterally between the two water blocks.

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

[0074] In the embodiment, the slide rail 28 is the slide rail 28 cooperating with the movement of the first water block 5, and the second sliding block 34 is mounted at the bottom of the fixed support 21. Through the movement of the first sliding block 29 on the slide rail 28, the lateral movement of the entire blood vessel bending mechanism is driven.

[0075] The guide groove 30 is provided with a second locking block 35, and the fixed support 21 is provided with a second locking plate 36 above the second locking block 35. 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 to the position, 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 mounted on one of the water blocks, and a temperature sensor 39 is mounted on the other water block.

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

[0079] The positions of the pressure sensor 38 and the temperature sensor 39 can 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 joint 40 is installed on the water channel block.

[0081] Preferably, a luer joint 40 is arranged at a position corresponding to each blood vessel interface 14, which facilitates the discharge of air in the simulated blood vessel 1.

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

[0083] Specifically, the tank body 41 includes an upper cover, a lower cover and a tank body 41 body 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, and when the pressure in the entire test machine is too high, the pressure relief valve 42 can be used for pressure relief.

[0085] The pressurizing port 43 is arranged on the upper cover, and when the pressure in the entire test machine is too low, the pressurizing port 43 can be used for pressurization.

[0086] The liquid adding port is arranged on the upper cover and is used for adding test liquid into the tank body 41; the liquid adding port is provided with a cover 44, which can close the liquid adding port when no liquid is needed.

[0087] Preferably, a heater (not shown in the figure) is further arranged in the tank body 41, so as to heat the test liquid to meet the test requirements.

[0088] In addition, a liquid level sensor (not shown in the figure) can also be arranged in the tank body 41, so as to detect the change of the liquid level in the tank body 41 in real time, and facilitate the timely supplement 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, and then the simulated blood vessel 1 at the position of the test sample is bent by 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, and then the test liquid is injected into the test system by using the pressure and temperature control system, so as to perform the bending test on the test sample.

[0090] The utility model discloses small volume, light in weight, convenient to install and arrange, and the whole adopts horizontal arrangement, and the mode of horizontal movement (namely convex die 2 translation towards female die 3) is used to carry out bending to simulation blood vessel 1, and gravity center is stable, not only can avoid the problem that test sample slides in simulation blood vessel 1, and can accurate control test sample bending curvature variable diameter, effectively guarantee the accuracy and effectiveness of test result.

[0091] The above ideal embodiments according to the utility model are used as inspiration, and through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of the utility model. The technical scope of the utility model is not limited to the content in the specification, and must be determined according to the scope of claims.

Claims

1. A bending fatigue testing machine, characterized in that, include The testing system includes two horizontally placed and oppositely arranged waterway blocks, and a blood vessel bending mechanism located between the two waterway blocks. Multiple simulated blood vessels (1) are connected between the two waterway blocks. The blood vessel bending mechanism includes multiple sets of bending modules corresponding to the simulated blood vessels (1). Each bending module includes a convex mold (2) and a concave mold (3) arranged opposite to each other. The simulated blood vessel (1) passes between the corresponding convex mold (2) and concave mold (3) to bend it using the convex mold (2) and concave mold (3). The pressure and temperature control system has its outlet (15) connected to one of the water channels via a water pump (4), and its return outlet (16) connected to another water channel to form a test loop with the test system.

2. The bending fatigue testing machine according to claim 1, characterized in that, The testing system also includes a base plate (9), on which the waterway 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 waterway block is provided with a main waterway (13) that runs through its length, and the side of the main waterway (13) is provided with a blood vessel interface (14) that is connected to each simulated blood vessel (1).

4. The bending fatigue testing machine according to claim 1, characterized in that, The punch (2) has a convex arc groove (19) on the side facing the corresponding die (3), and the die (3) has a concave arc groove (20) on the side facing the corresponding punch (2). The convex arc groove (19) and the concave arc groove (20) are matched and have the same radius of curvature.

5. The bending fatigue testing machine according to claim 1, characterized in that, The punches (2) and dies (3) in the same group can be close to or far apart.

6. The bending fatigue testing machine according to claim 5, characterized in that, The die (3) is mounted on a fixed bracket (21). A lead screw (22) is provided inside the fixed bracket (21). A sliding bracket (24) is provided on the lead screw slider (23) of the lead screw (22). 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 its corresponding die (3). One end of the lead screw (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 move toward or away from another waterway block; A slide rail (28) is provided below one of the waterway blocks, and a first slider (29) is provided at the bottom of the waterway block in sliding engagement with the slide rail (28).

8. The bending fatigue testing machine according to claim 1, characterized in that, The blood vessel bending mechanism is capable of translating between two waterway blocks; A slide rail (28) is provided below the blood vessel bending mechanism, and a second slider (34) is provided at the bottom of the blood vessel bending mechanism and slides on the slide rail (28).

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; The waterway block is equipped with a Luer connector (40).

10. The bending fatigue testing machine according to claim 1, characterized in that, The pressure and temperature control system includes a tank (41), and the top of the tank (41) is provided with a pressure relief valve (42), a pressure inlet (43) and a liquid inlet.

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