Fatigue durability testing equipment for bent pipe body

Abstract

The utility model discloses fatigue durability testing equipment for a bent pipe body, which is used for carrying out bending fatigue detection on the bent pipe body of an endoscope, the bent pipe body comprises a bent section and a straight section which are connected along the axial direction of the bent pipe body, and a traction rope is arranged on the bent section. The fatigue durability test equipment for the bent pipe body comprises a test board, a traction mechanism and a detection mechanism, the test bench is used for placing the bent pipe body, and a first limiting part is arranged on the test bench and used for limiting and fixing the straight section; the traction mechanism is arranged on the test board and comprises a traction part which is movably arranged, and the traction part is in driving connection with the traction rope so as to pull or release the traction rope in the moving process; the detection mechanism is arranged on the test table and comprises a first detection part, and the first detection part is arranged corresponding to the bent section so as to detect whether the bent section is bent in place or not when the traction rope pulls the bent section; therefore, the real-time performance of the test can be ensured, and the test is convenient, high in efficiency and high in accuracy.

Description

Fatigue durability testing equipment for bent tubes Technical Field

[0001] This utility model relates to the field of instrument testing technology, and in particular to a fatigue durability testing device for a bent tube. Background Technology

[0002] In recent years, with the development of medical technology, endoscopes have been widely used in hospitals of all sizes and have become an indispensable piece of equipment in the diagnosis and treatment of clinical diseases. In actual use, the curved section of the endoscope insertion part needs to be bent frequently; therefore, to ensure that the endoscope can withstand high-intensity operation, bending fatigue testing of the curved section of the insertion part is necessary during the research and development process. However, existing testing equipment is only compatible with finished endoscopes. Therefore, during the endoscope research and development process, bending fatigue testing of the curved section of the insertion part can only be performed after the complete endoscope (including the insertion part and the operating part) has been manufactured in the later stages of design. This results in a delay in the testing of the insertion part, preventing timely design adjustments and thus hindering the research and development progress. Summary of the Invention

[0003] The main purpose of this invention is to propose a fatigue durability testing device for bent tubes, which aims to solve the problem that existing testing devices are only compatible with finished endoscopes, resulting in a lag in the detection of bent tubes.

[0004] To achieve the above objectives, this utility model proposes a fatigue durability testing device for a bent tube, used for bending fatigue testing of the bent tube of an endoscope. The bent tube includes a bent section and a straight section connected along its axial direction, and a traction rope is provided on the bent section. The fatigue durability testing device for the bent tube includes:

[0005] A test stand is provided for placing the bent tube body. The test stand is provided with a first limiting part for limiting and fixing the straight section.

[0006] A traction mechanism, mounted on the test bench, includes a movably mounted traction part that drives a traction rope to pull or release the rope during its movement; and...

[0007] The testing mechanism is set on the test platform. The testing mechanism includes a first testing section, which is set to correspond to the bending section, so as to detect whether the bending section is bent in place when the traction rope pulls the bending section.

[0008] Preferably, the test platform includes a base plate, and a feeding platform and a mounting platform disposed on the base plate. The feeding platform is used to support the bent tube, and the mounting platform is located on the side of the feeding platform in the axial direction of the bent tube and is disposed away from the bent section.

[0009] The first limiting part is disposed on the feeding platform, the traction mechanism is disposed on the mounting platform, and the detection mechanism is disposed on the base plate.

[0010] Preferably, in the direction away from the base plate, the straight-line distance between the feeding platform and / or the mounting platform and the base plate is adjustable, so that the plane containing the central axis of the curved tube and the mid-plane of the traction part are in the same plane.

[0011] Preferably, the fatigue durability testing equipment for the bent tube further includes a height adjustment component disposed on the base plate. The height adjustment component includes a movable height adjustment part that can move closer to or further away from the base plate. The height adjustment part is supported and connected to the feeding platform to adjust the straight-line distance between the platform and the base plate during its movement.

[0012] Preferably, the feeding platform has a first surface facing away from the base plate, and a rib is protruding on the first surface. The rib extends along the axial direction of the curved tube, and the end face of the rib facing away from the first surface is used for supporting the curved section and the straight section.

[0013] Preferably, the test platform further includes a fixing platform, which is disposed on the base plate and located between the feeding platform and the mounting platform. The fixing platform is used to place the connector at the end of the straight section.

[0014] Preferably, the fatigue durability testing equipment for the bent tube further includes a second limiting part, which is disposed on the fixed platform and used to limit and fix the connecting parts.

[0015] Preferably, the position of the fixed platform relative to the feeding platform in the axial direction of the curved tube is adjustable.

[0016] Preferably, the test platform further includes a first guide platform, which is disposed on the base plate and located between the feeding platform and the mounting platform. The first guide platform is used to support the spring tube on the traction rope so that the traction rope is on a preset path.

[0017] Preferably, the position of the first guide table relative to the feeding table in the axial direction of the curved tube is adjustable.

[0018] Preferably, the test platform further includes a second guide platform, which is disposed on the base plate and located between the feeding platform and the mounting platform. The second guide platform is provided with a guide tube to provide a passage for the traction rope.

[0019] Preferably, the conduit includes a first section, a second section, and a third section, wherein the second section is configured as a bend and connects the first section and the third section, the first section is configured as a spring tube, and the third section is disposed near the traction mechanism.

[0020] Preferably, the first limiting part includes a plurality of clamping parts, which are arranged side by side at intervals in the axial direction of the curved tube. Each clamping part includes two clamping blocks, which are arranged side by side in the radial direction of the curved tube and jointly clamp and fix the straight section.

[0021] Preferably, the relative positions of the two clamping blocks in the radial direction of the curved tube are adjustable.

[0022] Preferably, the test stand includes a base plate and a mounting platform disposed on the base plate, the mounting platform including a mounting surface;

[0023] The traction unit includes a rotating component that is rotatably mounted on the mounting surface along the normal of the mounting surface. The rotating component is used for winding the traction rope so as to pull or loosen the traction rope accordingly when it rotates forward or backward.

[0024] Preferably, the circumferential sidewall of the rotating component is provided with an annular groove for accommodating the traction rope, and the end face of the rotating component is provided with a through hole communicating with the annular groove for the end of the traction rope to pass through.

[0025] The rotating component has a pressure plate at the position corresponding to the through hole to press and fix the end of the traction rope.

[0026] Preferably, the first detection unit includes a laser sensor, which is disposed on the test bench and is used to detect the actual bending parameters of the bending segment.

[0027] Preferably, the testing mechanism further includes a base disposed on the test bench, the position of the base relative to the curved tube in the radial direction of the curved tube being adjustable;

[0028] The laser sensor is mounted on the base.

[0029] Preferably, the traction part includes a rotatable component, which is used for two traction ropes to be wound from different directions, so as to pull different traction ropes when their directions are different, so that the curved section has two curved states with different bending directions.

[0030] The detection unit includes two laser sensors arranged side by side in the radial direction of the curved tube to detect the curved section under different bending conditions.

[0031] The technical solution provided by this utility model has at least the following advantages:

[0032] The fatigue durability testing device for bent tubes provided by this utility model includes a test platform, a traction mechanism, and a detection mechanism. The bent tube to be tested is placed on the test platform, and a straight section is fixed by a first limiting part. One end of the traction rope is connected to the bent section, and the other end is connected to the traction part of the traction mechanism. The traction part can be equivalent to the operating part of an endoscope. When the traction part moves, it can pull or release the traction rope, allowing the bent section to bend or straighten. Through the reciprocating movement of the traction part, the bent section can be repeatedly bent. Simultaneously, a first detection part and a second detection part are provided. Based on the bending parameters of the bent section and the activity parameters of the traction part, the bending performance of the bent tube is determined, thereby realizing the bending fatigue test of the bent tube. Thus, only the bent tube component is needed to complete the bending fatigue test, ensuring real-time testing and facilitating smooth research and development. Furthermore, the automated testing equipment is easy to operate, has high testing efficiency, and high accuracy. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0034] Figure 1 is a schematic diagram of an embodiment of a fatigue durability testing device for a bent tube provided by the present invention.

[0035] Figure 2 is a schematic diagram of the fatigue durability test equipment for the bent tube described in Figure 1, with respect to the test bench.

[0036] Figure 3 is an enlarged schematic diagram of part A of the test bench described in Figure 2;

[0037] Figure 4 is an enlarged schematic diagram of part B of the test bench described in Figure 2;

[0038] Figure 5 is an enlarged schematic diagram of part C of the test bench described in Figure 2;

[0039] Figure 6 is an enlarged schematic diagram of part D of the test bench described in Figure 2;

[0040] Figure 7 is a structural schematic diagram of the fatigue durability test equipment for the bent tube described in Figure 1 with respect to the first limiting part.

[0041] Figure 8 is a schematic diagram of the fatigue durability test equipment for the bent tube described in Figure 1, with respect to the traction mechanism.

[0042] Figure 9 is a schematic diagram of the fatigue durability performance testing equipment for the bent tube described in Figure 1, with respect to the testing mechanism.

[0043] Figure 10 is a top view of the detection mechanism described in Figure 9;

[0044] Figure 11 is a schematic diagram of the detection mechanism for the laser sensor described in Figure 9;

[0045] Figure 12 is a flowchart of the first method for testing the fatigue durability of a bent tube provided by the present invention;

[0046] Figure 13 is a second flowchart of the test method for the fatigue durability performance of the bent tube provided by the present invention;

[0047] Figure 14 is a third flowchart of the test method for the fatigue durability performance of the bent tube provided by the present invention.

[0048] Explanation of icon numbers:

[0049] Fatigue durability testing equipment for 100-degree bending pipe; 1 Test stand; 11 Base plate; 12 Feeding platform; 121 First surface; 122 Rib; 13 Mounting platform; 131 Mounting surface; 14 First guide platform; 15 Second guide platform; 16 Guide tube; 161 First pipe section; 162 Second pipe section; 163 Third pipe section; 17 Fixing platform; 2 First limiting part; 21 Clamping part; 211 Clamping block; 3 Traction mechanism; 31 Traction part; 311 Rotating part; 3111 Annular groove; 3112 Through hole; 3113 Pressure plate; 32 Traction drive part; 4 Detection mechanism; 41 First detection part; 411 Laser sensor; 42 Base; 5 Second limiting part; 51 First limiting groove; 52 Limiting cover plate; 6 Height adjustment component; 61 Height adjustment part; 7 Operating platform; 71 Chassis; 72 Touch screen display;

[0050] 200 Bending pipe body; 201 Bending section; 202 Straight section; 203 Connecting parts;

[0051] 300 traction rope; 301 spring tube.

[0052] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0053] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0054] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0055] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0056] An endoscope is a medical device used to observe internal cavities and organs of the human body, and it has wide applications in medical diagnosis and treatment. An endoscope typically consists of an insertion section, an operating section, a connecting section, a light source system, an imaging system, and a display system. The insertion section is the part of the endoscope that extends into the body cavity; its main body is usually a slender, flexible tube. The operating section includes a drive mechanism and a traction rope. One end of the traction rope is connected to the curved section of the insertion section, and the other end is connected to the drive mechanism. When the drive mechanism moves, it pulls or releases the traction rope, causing the curved section to bend or straighten accordingly. In actual research and development, due to limitations in the manufacturing processes of each component, the insertion section is usually prototyped before the operating section.

[0057] To ensure timely testing of the insertion section and facilitate smooth research and development, this invention provides a fatigue durability testing device 100 for a bent tube. The device 100 is used to perform bending fatigue testing on a bent tube 200 of an endoscope. The bent tube 200 includes a bent section 201 and a straight section 202 connected along its axial direction F1. A traction rope 300 is provided on the bent section 201.

[0058] Please refer to Figure 1. The fatigue durability testing equipment 100 for the bent pipe body includes a test platform 1, a traction mechanism 3, and a detection mechanism 4. The test platform 1 is used to place the bent pipe body 200. A first limiting part 2 is provided on the test platform 1 to limit and fix the straight section 202. The traction mechanism 3 is provided on the test platform 1. The traction mechanism 3 includes a movable traction part 31. The traction part 31 drives and connects to a traction rope 300 to pull or release the traction rope 300 during its movement. The detection mechanism 4 is provided on the test platform 1. The detection mechanism 4 includes a first detection part 41. The first detection part 41 is provided corresponding to the bent section 201 to detect whether the bent section 201 is bent in place when the traction rope 300 pulls the bent section 201.

[0059] The fatigue durability testing equipment 100 for the bent tube also includes a controller (not shown in the figure), which is electrically connected to the traction mechanism 3 and the detection mechanism 4.

[0060] During the research and development process, after the curved tube body 200 sample is manufactured, the curved tube body 200 can be subjected to bending fatigue testing using the fatigue durability testing equipment 100. The curved tube body 200 is placed on the test table 1, and the first limiting part 2 on the test table 1 limits and fixes the straight section 202. A traction mechanism 3 is set on the test table 1. One end of the traction rope 300 is connected to the curved section 201, and the other end is connected to the traction part 31 of the traction mechanism 3. At this time, the traction part 31 is equivalent to the operating part of an endoscope. By moving the traction part 31, the traction rope 300 is pulled or released, so that the curved section 201 can bend or straighten. Thus, when the traction part 31 continuously performs reciprocating motion, it can drive the curved section 201 to bend repeatedly. Meanwhile, a testing mechanism 4 is provided on the test bench 1. The testing mechanism 4 includes a first testing part 41, which is provided corresponding to the bending section 201. When the traction rope 300 pulls the bending section 201, it detects whether the bending section 201 is bent in place, thereby completing the bending fatigue aging test of the bending tube 200.

[0061] Thus, the fatigue durability testing equipment 100 for the bent tube 200 can perform bending fatigue aging tests on the bent tube 200 immediately after the sample is fabricated, without waiting for the sample to be fabricated by the operating unit. This ensures real-time testing and facilitates smooth research and development. Furthermore, the test bench 1, the traction mechanism 3, the detection mechanism 4, and the controller integrate automated testing equipment. Utilizing this automated equipment to complete the bending fatigue aging test is convenient to operate, highly efficient, and accurate.

[0062] In one embodiment, referring to FIG2, the test platform 1 includes a base plate 11, a feeding platform 12 and a mounting platform 13 disposed on the base plate 11. The feeding platform 12 is used to support the bent tube 200. The mounting platform 13 is located on one side of the feeding platform 12 in the axial direction F1 of the bent tube 200 and is disposed away from the bent section 201. The first limiting part 2 is disposed on the feeding platform 12, the traction mechanism 3 is disposed on the mounting platform 13, and the detection mechanism 4 is disposed on the base plate 11.

[0063] It is known that in actual products, the operating part is usually set as a rotating wheel, and the outer wall of the rotating wheel is provided with an annular groove for the traction rope to be wound. The annular groove is generally located in the middle of the rotating wheel. Since the traction part 31 is equivalent to the operating part of the endoscope, in order to further simulate the positional relationship between the bent tube 200 and the operating part, and to ensure that the bending state of the bent tube 200 in the test is approximately the same as its bending state in the endoscope, thereby improving the test accuracy, it is necessary to further define the positional relationship between the bent tube 200 and the traction part 31. In one embodiment, in the direction away from the base plate 11, the straight-line distance between the feeding platform 12 and / or the mounting platform 13 and the base plate 11 is adjustable, so that the plane containing the central axis of the bent tube 200 and the mid-plane of the traction part 31 are in the same plane. In this way, the installation state of the bent tube 200 in the endoscope can be further simulated, and the accuracy of the test results can be further improved.

[0064] In other words, the straight-line distance between the feeding platform 12 and the base plate 11 can be adjusted, as can the straight-line distance between the mounting platform 13 and the base plate 11. Alternatively, the straight-line distances between the feeding platform 12 and the mounting platform 13 and the base plate 11 can be adjusted simultaneously. By adjusting the relative height of the feeding platform 12 and the mounting platform 13, the plane containing the central axis of the bent tube 200 and the mid-plane of the traction part 31 can be kept in the same plane.

[0065] Referring to Figure 2, the fatigue durability testing equipment 100 for the bent tube further includes a height adjustment component 6 and a distance detection component 7. The height adjustment component 6 is disposed on the base plate 11 and includes a movable height adjustment part 61, which can move closer to or further away from the base plate 11. The height adjustment part 61 is supported and connected to the feeding platform 12 to adjust the straight-line distance between the feeding platform 12 and the base plate 11 during its movement. The distance detection component 7 is respectively disposed corresponding to the feeding platform 12 and the mounting platform 13 to detect the height difference between the feeding platform 12 and the mounting platform 13. The controller is electrically connected to the height adjustment component 6 and the distance detection component 7 to control the movement of the height adjustment part 61 when the height difference exceeds a preset value.

[0066] In an exemplary embodiment, the side surface of the feeding platform 12 facing away from the base plate 11 is used to place the bent tube 200, and the side surface of the mounting platform 13 facing away from the base plate 11 is used to mount the traction part 31. In order to ensure that the plane containing the central axis of the bent tube 200 and the mid-plane of the traction part 31 are in the same plane, the standard height difference between the surface of the feeding platform 12 and the surface of the mounting platform 13 can be determined according to the actual product specifications.

[0067] The distance detection component 7 includes a first distance detection unit 71 and a second distance detection unit 72. The first distance detection unit 71 is disposed corresponding to the feeding platform 12 and is used to detect a first straight-line distance between the surface of the feeding platform 12 and the base plate 11. The second distance detection unit 72 is disposed corresponding to the mounting platform 13 and is used to detect a second straight-line distance between the surface of the mounting platform 13 and the base plate 11. Based on the first straight-line distance and the second straight-line distance, the actual height difference between the feeding platform 12 and the mounting platform 13 is determined. Based on the actual height difference and the standard height difference, an adjustment height parameter is determined. The height adjustment unit 61 adjusts the height of the feeding platform 12 according to the adjustment height parameter.

[0068] It is understood that the feeding platform 12 is used to support the bent section 201 and the straight section 202. In order to reduce the friction between the bent section 201 and the feeding platform 12 during the bending process, in one embodiment, as shown in Figure 4, the feeding platform 12 has a first surface 121 facing away from the base plate 11. A rib 122 protrudes from the first surface 121. The rib 122 extends along the axial direction F1 of the bent tube body 200. The end face of the rib 122 facing away from the first surface 121 is used to support the bent section 201 and the straight section 202. By setting the rib 122 to raise the ground of the bent section 201, the bent section 201 is suspended when bending, thereby avoiding large friction with the feeding platform 12, thereby further eliminating other interference factors and ensuring the accuracy of the test results.

[0069] In the actual product, the bent tube body 200 includes a bent section 201, a straight section 202, and a connector 203 connected sequentially along its axial direction F1. The radial dimension F2 of the connector 203 is usually much larger than that of the straight section 202. In order to ensure that the central axes of the bent section 201, the straight section 202, and the connector 203 are on the same horizontal plane, thereby optimizing the test results, it is necessary to fix the straight section 202 and the connector 203 separately. In one embodiment, please refer to Figure 2. The test table 1 also includes a fixing table 17. The fixing table 17 is disposed on the base plate 11 and is located between the feeding table 12 and the mounting table 13. The fixing table 17 is used to place the connector 203 at the end of the straight section 202.

[0070] Following the above, the first limiting part 2 is provided on the feeding platform 12 to limit and fix the straight section 202. In order to further improve the placement stability of the bent tube 200, in one embodiment, please refer to Figure 3, the fatigue durability performance testing equipment 100 of the bent tube also includes a second limiting part 5. The second limiting part 5 is provided on the fixing platform 17 and is used to limit and fix the connecting piece 203. By using the first limiting part 2 and the second limiting part 5 to jointly limit and fix the straight section 202 and the connecting piece 203, the stability of the bent tube 200 can be guaranteed, and the test results can be avoided due to the displacement of the bent tube 200 during the test.

[0071] Specifically, the fixing platform 17 is provided with a first limiting groove 51, and the connector 203 is clamped and fixed in the first limiting groove 51. The fixing platform 17 is provided with a limiting cover plate 52, which is detachably installed at the opening of the first limiting groove 51 to limit and fix the connector 203, so as to prevent the connector 203 from detaching from the opening of the first limiting groove 51, and further ensure the installation stability of the bent tube 200; wherein, the second limiting part 5 includes the first limiting groove 51 and the limiting cover plate 52.

[0072] It is known that the lengths of the straight section 202 and the connector 203 are different for different specifications of bent tubes 200. The position of the fixed platform 17 relative to the feeding platform 12 on the axial direction F1 of the bent tube 200 is adjustable to adjust the relative position between the fixed platform 17 and the feeding platform 12, thereby adapting to different specifications of bent tubes 200.

[0073] This utility model does not impose specific limitations on the installation method of the fixed platform 17. In one embodiment, the fixed platform 17 is installed on the base plate 11 via a threaded connection structure. The threaded connection structure includes an elongated hole on the base plate 11, a threaded hole on the fixed platform 17, and a stud that passes through the elongated hole and is threaded to the threaded hole. The long axis of the elongated hole is arranged along the axial direction F1 of the curved tube 200. In another embodiment, a sliding connection structure is provided between the fixed platform 17 and the base plate 11. The sliding connection structure includes a sliding groove and a slider, one of which is provided on the base plate 11 and the other is provided on the fixed platform 17.

[0074] As described above, the feeding platform 12 and the mounting platform 13 respectively place the bent tube 200 and the traction part 31. In order to simulate the environment of the endoscope product and meet the bending angle requirements of the bent section 201, there is a large gap between the feeding platform 12 and the mounting platform 13. One end of the traction rope 300 is connected to the bent section 201, and the other end passes through the bent tube 200 and is connected to the traction part 31. The part of the traction rope 300 between the feeding platform 12 and the mounting platform 13 is in a suspended state. In order to ensure the stability of the traction rope 300 when pulling the bent section 201, in one embodiment, referring to Figure 5, the test platform 1 also includes a first guide platform 14. The first guide platform 14 is disposed on the base plate 11 and is located between the feeding platform 12 and the mounting platform 13. The first guide platform 14 is used to support the spring tube 301 on the traction rope 300 so that the traction rope 300 is on a preset path.

[0075] It is known that the lengths of the curved tubes 200 of different specifications are different, and the positions of the spring tubes on the traction ropes 300 are also different. In one embodiment, the position of the first guide table 14 relative to the feeding table 12 on the axial direction F1 of the curved tube 200 is adjustable. By adjusting the position of the first guide table 14, it can adapt to the curved tubes 200 of different specifications.

[0076] Furthermore, in order to further correct the posture of the traction rope 300 and ensure that the traction rope 300 does not deviate from the preset path, in one embodiment, please refer to Figure 6, the test platform 1 further includes a second guide platform 15. The second guide platform 15 is disposed on the base plate 11 and is located between the feeding platform 12 and the mounting platform 13. The second guide platform 15 is provided with a guide tube 16 to provide a passage for the traction rope 300.

[0077] Similarly, the position of the second guide table 15 relative to the feeding table 12 in the axial direction F1 of the curved tube 200 is adjustable; by adjusting the position of the second guide table 15, it can accommodate curved tubes 200 of different specifications.

[0078] It is understandable that the conduit 16 provides a passage for the traction rope 300 to guide it in changing its direction. If a common round tube is used, although it can provide guidance, the contact area between the traction rope 300 and the inside of the tube is large, resulting in significant friction between them. To reduce friction, in one embodiment, as shown in Figure 6, the conduit 16 includes a first section 161, a second section 162, and a third section 163. The second section 162 is a bend and connects the first section 161 and the third section 163. The second section 162 is a spring tube, and the third section 163 is located close to the traction mechanism 3.

[0079] The second tube segment 162 is designed as a spring tube, which serves two purposes: firstly, it guides the traction rope 300; secondly, the traction rope 300 only contacts the apex of the arc of the spring tube, rather than the entire inner wall, thus significantly reducing the contact area between the traction rope 300 and the inner wall of the spring tube, thereby reducing the friction between them; furthermore, since the second tube segment 162 is the middle part of the conduit 16, it is usually in a bent state during testing and normal use. Designing the second tube segment 162 as a spring tube allows it to adaptively adjust its shape according to the axial path of the traction rope 300, thereby effectively reducing the risk of breakage of the conduit 16 during repeated movements of the traction rope 300.

[0080] Specifically, the first pipe segment 161, the second pipe segment 162, and the third pipe segment 163 are all configured as spring tubes, that is, the entire conduit 16 is configured as a spring tube. In this way, during the reciprocating motion of the traction rope 300, the entire conduit 16 can adaptively adjust its shape according to the axial path of the traction rope 300.

[0081] In one embodiment, referring to FIG7, the first limiting part 2 includes a plurality of clamping parts 21, which are arranged side by side at intervals on the axial direction F1 of the curved tube body 200. Each clamping part 21 includes two clamping blocks 211, which are arranged side by side on the radial direction F2 of the curved tube body 200 and jointly clamp and fix the straight section 202.

[0082] In other words, the straight section 202 is fixed by two clamping blocks 211; the relative positions of the two clamping blocks 211 on the radial F2 of the curved tube 200 are adjustable, so that the gap between the two clamping blocks 211 is adjustable, thereby adapting to curved tubes 200 with different outer diameter specifications.

[0083] As described above, the bent section 201 and the straight section 202 are disposed on the feeding platform 12 and clamped and fixed by the clamping block 211 on the feeding platform 12. That is, the feeding platform 12 and the clamping block 211 are in direct contact with the bent tube body 200, and when the bent section 201 bends, the bent tube body 200 will rub against the feeding platform 12 and the clamping block 211. In order to reduce friction, in one embodiment, the feeding platform 12, the fixing platform 17 and the clamping block 211 are made of PTFE (Polyte trafluoroethylene). It is known that PTFE material has a smooth surface, high temperature resistance, extremely low coefficient of friction, does not easily adhere to impurities and is non-toxic. Therefore, the friction between the bent section 201 and the feeding platform 12 and the clamping block 211 is small, the bending resistance of the bent section 201 is small, and the surface of the bent section 201 will not be damaged.

[0084] Meanwhile, the height adjustment section 61 supports the feeding platform 12, and the connecting member 203 is disposed on the fixed platform 17. Therefore, the height adjustment section 61 and the fixed platform 17 only serve a supporting function and will not directly contact the curved section 201 and the straight section 202. In order to facilitate processing, reduce costs and reduce weight, both the height adjustment section 61 and the fixed platform 17 are made of aluminum alloy.

[0085] Typically, the operating part of an endoscope is configured as a rotating wheel. To further simulate the operating part of an endoscope, in one embodiment, referring to Figure 8, the traction part 31 includes a rotating member 311, which is rotatably mounted on the test platform 1. The rotating member 311 is used for winding the traction rope 300, so as to pull or loosen the traction rope 300 when it rotates. The traction mechanism 3 also includes a traction drive assembly electrically connected to the controller. The traction drive assembly includes a movably disposed traction drive part 32, which drives the rotating member 311 to drive the rotating member 311 to rotate in both directions. Specifically, the mounting platform 13 includes a mounting surface 131 facing away from the base plate 11; the rotating member 311 is rotatably mounted on the mounting surface 131 along the normal of the mounting surface 131.

[0086] It is understood that the traction rope 300 is a component connected to the bent tube 200, while the rotating component 311 is a component of the fatigue durability testing equipment 100 for the bent tube. During the bending fatigue aging test, the traction rope 300 and the rotating component 311 need to be frequently disassembled and reassembled. In order to ensure the strength of the rotating component 311 and prevent damage to the component due to frequent disassembly and reassembly, in one embodiment, the peripheral sidewall of the rotating component 311 is provided with an annular groove 3111 for accommodating the traction rope 300, and the end face of the rotating component 311 is provided with a through hole 3112 communicating with the annular groove 3111 for the end of the traction rope 300 to pass through. The rotating component 311 is provided with a pressure plate 3113 at the position corresponding to the through hole 3112 for pressing and fixing the end of the traction rope 300. That is, the end of the traction rope 300 is fixed by clamping and fastening, which satisfies the fixing force while facilitating the fixing and disassembly of the traction rope 300.

[0087] As described above, by setting the first detection unit 41 and the second detection unit, it is determined whether the bending segment 201 has bent to the correct position during the bending fatigue aging test. It can be understood that when the traction rope 300 pulls the bending segment 201, it will cause the bending segment 201 to bend. By selecting a detection point on the bending segment 201, such as the end of the bending segment 201, a fixed movement trajectory will exist at its end when the bending segment 201 bends.

[0088] In one embodiment, referring to Figures 9 to 11, the first detection unit 41 includes a laser sensor 411, which is disposed on the test bench 1 and is used to detect the actual bending parameters of the bending segment 201; wherein, the controller is electrically connected to the laser sensor 411.

[0089] The following describes the placement and specific detection method of the laser sensor 411. The laser sensor 411 can be placed on one side of the feeding platform 12 along the axial direction F1 of the curved tube 200, or it can be placed above the feeding platform 12. Referring to Figures 9 to 11, the laser sensor 411 is spaced apart from the curved tube 200 along the radial direction F2, and a preset distance is maintained between the laser sensor 411 and the curved tube 200.

[0090] The determination of the preset distance is related to the bending angle of the bending segment 201. For example, when the rotating component 311 rotates by a preset angle X (e.g., 50°), the bending segment 201 initially has a standard bending angle Y (e.g., 180°). As the number of bends of the bending segment 201 increases, the traction rope 300 is repeatedly stretched, which can lead to adverse factors such as plastic deformation and elongation of the traction rope 300. Therefore, when the rotating component 311 rotates by a preset angle X (e.g., 50°), the bending angle of the bending segment 201 may gradually decrease. At this time, a target bending angle Z (e.g., 150°) can be set. When the actual bending angle of the bending segment 201 is less than the target bending angle Z, it indicates that the bending segment 201 has failed, and the test can be stopped. According to the target bending angle Z (e.g., 150°), the detection point on the bending segment 201 can be found at a target position on the feeding table 12. The distance from this target position to the bending tube 200 in the radial direction F2 of the bending tube body 200 is the preset distance.

[0091] It is understood that the laser sensor 411 typically determines distance or other parameters by emitting a laser beam onto a target object and measuring the reflected light. During the test, the bending segment 201 repeatedly bends. When the laser sensor 411 receives the reflected light, it means that the light emitted by the laser sensor 411 hits the bending segment 201. The distance can be determined based on the reflected light, thereby determining the actual bending angle of the bending segment 201. At this time, the detection point is at or beyond the target position, and the actual bending angle of the bending segment 201 is between the standard bending angle Y and the target bending angle Z (between 180° and 150°), and the bending segment 201 has not failed. When the laser sensor 411 does not receive the reflected light, it means that the light emitted by the laser sensor 411 has not hit the bending segment 201. At this time, the detection point does not reach the target position, and the actual bending angle of the bending segment 201 is less than the target bending angle Z (150°), and the bending segment 201 has failed.

[0092] As described above, using the end of the bent section 201 as the detection point, since the bending radius of the bent section 201 is different for different specifications of the bent tube 200, the movement trajectory of the end of the bent section 201 is also different when bending. At the target bending angle Z, the target position of the detection point on the bent section 201 of different specifications of the bent tube 200 on the feeding table 12 is also different, thus making the preset distance different. In order to accommodate bent tubes 200 of different specifications, in one embodiment, the detection mechanism 4 further includes a base 42 disposed on the test table 1. The position of the base 42 relative to the bent tube 200 in the radial direction F2 is adjustable; wherein, the laser sensor 411 is disposed on the base 42.

[0093] In actual products, endoscopes typically have two traction ropes 300, which pull and bend the curved section 201 in different directions. To simulate the actual operation of an endoscope, the rotating member 311 is used to allow the two traction ropes 300 to wind in different directions, so that different traction ropes 300 are pulled when their directions are opposite, resulting in two bending states of the curved section 201 with opposite bending directions. In one embodiment, referring to Figures 9 to 11, the detection unit includes two laser sensors 411, which are arranged side by side on the radial direction F2 of the curved tube 200 to detect the curved section 201 in different bending states.

[0094] Following the aforementioned embodiment where "the two clamping blocks 211 are arranged side by side on the radial F2 of the curved tube 200 and jointly clamp and fix the straight section 202", when the laser sensor 411 is located on one side of the feeding table 12 on the axial F1 of the curved tube 200, in order to avoid the clamping blocks 211 blocking the laser emitted by the laser sensor 411, the clamping blocks 211 are partially hollowed out to avoid the laser emitted by the laser sensor 411.

[0095] In this utility model, the fatigue durability testing equipment 100 for the bent tube further includes an operating table 7, which is disposed on the testing table 1. The operating table 7 includes a chassis 71 and a touch screen display 72. The chassis 71 has an installation cavity for accommodating wiring and related components. The controller is disposed within the chassis 71. The chassis 71 has an opening communicating with the installation cavity. The touch screen display 72 is disposed within the chassis 71, and its display panel is exposed from the opening for user operation.

[0096] Based on the aforementioned fatigue durability testing equipment 100 for bent pipes, a method for testing the fatigue durability of bent pipes 200 is also provided. The method for testing the fatigue durability of bent pipes 200 includes:

[0097] S10: Receive test start command;

[0098] S30: According to the test start command, control the insertion part testing device to enter the test mode, wherein the test mode includes controlling the traction mechanism to work according to a preset control program.

[0099] Specifically, step S30, which controls the traction mechanism to operate according to a preset control program, includes:

[0100] S310: Control the traction drive assembly to start and drive the rotating component to rotate with preset parameters;

[0101] S320: Obtain the actual bending parameters of the curved section and the actual rotation parameters of the rotating component;

[0102] S330: Adjust the control strategy of the traction mechanism according to the target parameters, the actual bending parameters, and the actual rotation parameters.

[0103] Please refer to Figure 12, which is a first embodiment of the test method for the fatigue durability performance of the bent tube 200.

[0104] In the first embodiment, the preset parameters include a preset rotation angle.

[0105] Step S310, which controls the traction drive assembly to start and drives the rotating component to rotate at preset parameters, includes:

[0106] S3110: Control the traction drive assembly to drive the rotating component to rotate by the preset rotation angle.

[0107] Meanwhile, the preset parameters also include a preset rotation direction, which is configured as a first direction and a second direction that are intersected.

[0108] Step S3110, which controls the traction drive assembly to drive the rotating component to rotate by the preset rotation angle, includes:

[0109] S3111: Control the traction drive assembly to drive the rotating component to rotate in the first direction by the preset rotation angle;

[0110] S3112: Control the traction drive assembly to drive the rotating component to rotate in the second direction by the preset rotation angle;

[0111] S3113: Repeat the steps of rotating in the first direction and rotating in the second direction alternately in sequence.

[0112] Furthermore, the target parameter is configured as the alarm bending angle of the bending segment, and the actual bending parameter is configured as the actual bending angle of the bending segment.

[0113] Step S330, which adjusts the control strategy of the traction mechanism based on the target parameters, the actual bending parameters, and the actual rotation parameters, includes:

[0114] S3310: When the actual bending angle does not reach the alarm bending angle, control the traction drive assembly to drive the rotating component to continue rotating at the preset rotation angle;

[0115] S3320: When the actual bending angle reaches the alarm bending angle, control the traction drive assembly to stop.

[0116] The insertion part testing device also includes a counter electrically connected to the controller, the counter being used to record the actual number of rotations of the rotating component.

[0117] After step S3310, which controls the traction drive assembly to drive the rotating member to continue rotating, the method further includes:

[0118] S3311: Obtain the actual number of rotations of the rotating component;

[0119] S3312: When the actual number of rotations reaches the target number of rotations, control the traction drive component to stop.

[0120] Please refer to Figure 13, which is a second embodiment of the test method for the fatigue durability performance of the bent tube 200.

[0121] In the second embodiment, the preset parameters include a preset bending angle, which is configured such that the rotating component drives the bending segment to bend to a constant bending angle.

[0122] Step S310, which controls the traction drive assembly to start and drives the rotating component to rotate at preset parameters, includes:

[0123] S3110': Control the traction drive assembly to drive the rotating member to rotate, so that the curved section bends to the preset bending angle.

[0124] Meanwhile, the preset parameters also include a preset rotation direction, which is configured as a first direction and a second direction that are intersected.

[0125] Step S3110', which controls the traction drive assembly to drive the rotating member to rotate, includes:

[0126] S3111': Control the traction drive assembly to drive the rotating member to rotate in the first direction, so that the bending segment bends in the first direction to the preset bending angle;

[0127] S3112': Control the traction drive assembly to drive the rotating member to rotate in the second direction, so that the bending segment bends in the second direction to the preset bending angle;

[0128] S3113': Repeat the steps of rotating in the first direction and rotating in the second direction alternately.

[0129] Furthermore, the target parameter is configured as the alarm rotation angle of the rotating component, and the actual rotation parameter is configured as the actual rotation angle of the rotating component.

[0130] Step S330, which adjusts the control strategy of the traction mechanism based on the target parameters, the actual bending parameters, and the actual rotation parameters, includes:

[0131] S3310': When the actual rotation angle does not reach the alarm rotation angle, control the traction drive assembly to drive the rotating part to continue rotating, so as to drive the bending section to bend to the preset bending angle;

[0132] S3320': When the actual rotation angle reaches the alarm rotation angle, control the traction drive assembly to stop.

[0133] The insertion part testing device also includes a counter electrically connected to the controller, the counter being used to record the actual number of rotations of the rotating component.

[0134] After step S3310' of controlling the traction drive assembly to drive the rotating member to continue rotating, the method further includes:

[0135] S3311': Obtain the actual number of rotations of the rotating component;

[0136] S3312': When the actual number of rotations reaches the target number of rotations, control the traction drive component to stop.

[0137] Please refer to Figure 14, which is the third embodiment of the test method for the fatigue durability of the bent tube 200.

[0138] The insertion part testing device 100 also includes a counter electrically connected to the controller, which is used to record the number of rotations of the rotating member 311; the preset parameters include a preset rotation angle, a preset bending angle, a first preset number of rotations and a second preset number of rotations, and the preset bending angle is configured such that the rotating member drives the bending segment to bend to a constant bending angle.

[0139] Step S310, which controls the traction drive assembly to start and drives the rotating component to rotate at preset parameters, includes:

[0140] S3110”: Control the traction drive assembly to drive the rotating component to rotate the first preset number of times, wherein the rotating component rotates to the preset rotation angle each time;

[0141] S3120”: Control the traction drive assembly to drive the rotating member to rotate the second preset number of times, wherein each rotation of the rotating member causes the curved segment to bend to the preset bending angle.

[0142] Meanwhile, the preset parameters also include a preset rotation direction, which is configured as a first direction and a second direction that are intersected.

[0143] Step S3110, which controls the traction drive assembly to drive the rotating component to rotate the first preset number of times, includes:

[0144] S3111”: Control the traction drive assembly to drive the rotating component to rotate in the first direction by the preset rotation angle;

[0145] S3112”: Control the traction drive assembly to drive the rotating component to rotate in the second direction by the preset rotation angle;

[0146] S3113”: Repeat the steps of rotating in the first direction and rotating in the second direction alternately.

[0147] Step S3120, which controls the traction drive assembly to drive the rotating component to rotate the second preset number of times, includes:

[0148] S3121”: Control the traction drive assembly to drive the rotating member to rotate in the first direction, so that the bending segment bends in the first direction to the constant bending angle;

[0149] S3122”: Control the traction drive assembly to drive the rotating member to rotate in the second direction, so that the bending segment bends in the second direction to the constant bending angle;

[0150] S3123”: Repeat the steps of rotating in the first direction and rotating in the second direction alternately.

[0151] Furthermore, the target parameters are configured as the alarm bending angle of the bending segment and the alarm rotation angle of the rotating component, the actual bending parameters are configured as the actual bending angle of the bending segment, and the actual rotation parameters are configured as the actual rotation angle of the rotating component.

[0152] Step S330, which adjusts the control strategy of the traction mechanism based on the target parameters, the actual bending parameters, and the actual rotation parameters, includes:

[0153] S3310”: Within the range of the first preset number of rotations, when the actual bending angle does not reach the alarm bending angle, the traction drive assembly is controlled to drive the rotating component to continue rotating at the preset rotation angle; when the actual bending angle reaches the alarm bending angle, the traction drive assembly is controlled to stop.

[0154] S3320”: Within the range of the second preset number of rotations, when the actual rotation angle does not reach the alarm rotation angle, the traction drive assembly is controlled to drive the rotating component to continue rotating, so as to drive the bending segment to bend to the preset bending angle. When the actual rotation angle reaches the alarm rotation angle, the traction drive assembly is controlled to stop.

[0155] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. A fatigue durability testing device for a bent tube body, used for performing bending fatigue testing on the bent tube body of an endoscope, the bent tube body comprising a bent section and a straight section connected along its axial direction, the bent section being provided with a traction rope, characterized in that, The fatigue durability testing equipment for the bent pipe includes: a test platform for placing the bent pipe, wherein a first limiting part is provided on the test platform for limiting and fixing the straight section; a traction mechanism disposed on the test platform, wherein the traction mechanism includes a movably disposed traction part, the traction part driving a traction rope to pull or release the traction rope during its movement; and a detection mechanism disposed on the test platform, wherein the detection mechanism includes a first detection part, the first detection part being disposed corresponding to the bent section, to detect whether the bent section is bent in place when the traction rope pulls the bent section.

2. The fatigue durability testing equipment for bent pipes according to claim 1, characterized in that, The test platform includes a base plate, a feeding platform and a mounting platform disposed on the base plate. The feeding platform is used to support the bent tube body, and the mounting platform is located on one side of the feeding platform along the axial direction of the bent tube body and is disposed away from the bent section. The first limiting part is disposed on the feeding platform, the traction mechanism is disposed on the mounting platform, and the detection mechanism is disposed on the base plate.

3. The fatigue durability testing equipment for bent pipes according to claim 2, characterized in that, In the direction away from the base plate, the straight-line distance between the feeding platform and / or the mounting platform and the base plate is adjustable so that the plane containing the central axis of the curved tube and the mid-plane of the traction part are in the same plane.

4. The fatigue durability testing equipment for bent pipes according to claim 3, characterized in that, The fatigue durability testing equipment for the bent tube also includes a height adjustment component disposed on the base plate. The height adjustment component includes a movable height adjustment part that can move closer to or further away from the base plate. The height adjustment part is supported and connected to the feeding platform to adjust the straight-line distance between the feeding platform and the base plate during its movement.

5. The fatigue durability testing equipment for bent pipes according to claim 2, characterized in that, The feeding platform has a first surface facing away from the base plate. A rib protrudes from the first surface and extends along the axial direction of the curved tube. The end face of the rib facing away from the first surface is used to support the curved section and the straight section.

6. The fatigue durability testing equipment for bent pipes according to claim 2, characterized in that, The test platform also includes a fixed platform, which is disposed on the base plate and located between the feeding platform and the mounting platform. The fixed platform is used to place the connector at the end of the straight section.

7. The fatigue durability testing equipment for bent pipes according to claim 6, characterized in that, The fatigue durability testing equipment for the bent tube also includes a second limiting part, which is disposed on the fixed platform and is used to limit and fix the connecting parts.

8. The fatigue durability testing equipment for bent pipes according to claim 6, characterized in that, The position of the fixed platform relative to the feeding platform in the axial direction of the curved tube is adjustable.

9. The fatigue durability testing equipment for bent pipes according to claim 2, characterized in that, The test platform also includes a first guide platform, which is disposed on the base plate and located between the feeding platform and the mounting platform. The first guide platform is used to support the spring tube on the traction rope so that the traction rope is on a preset path.

10. The fatigue durability testing equipment for bent pipes according to claim 9, characterized in that, The position of the first guide table relative to the feeding table in the axial direction of the curved tube is adjustable.

11. The fatigue durability testing equipment for bent pipes according to claim 2, characterized in that, The test platform also includes a second guide platform, which is disposed on the base plate and located between the feeding platform and the mounting platform. The second guide platform is provided with a guide tube to provide a passage for the traction rope.

12. The fatigue durability testing equipment for bent pipes according to claim 11, characterized in that, The conduit includes a first section, a second section, and a third section. The second section is configured as a bend and connects the first section and the third section. The second section is configured as a spring tube. The third section is located near the traction mechanism.

13. The fatigue durability testing equipment for bent pipes according to claim 1, characterized in that, The first limiting part includes multiple clamping parts, which are arranged side by side at intervals in the axial direction of the curved tube. Each clamping part includes two clamping blocks, which are arranged side by side in the radial direction of the curved tube and jointly clamp and fix the straight section.

14. The fatigue durability testing equipment for bent pipes according to claim 13, characterized in that, The relative positions of the two clamping blocks in the radial direction of the curved tube are adjustable.

15. The fatigue durability testing equipment for bent pipes according to claim 1, characterized in that, The test stand includes a base plate and a mounting platform disposed on the base plate. The mounting platform includes a mounting surface. The traction unit includes a rotating component that is rotatably mounted on the mounting surface along the normal of the mounting surface. The rotating component is used for winding the traction rope so as to pull or loosen the traction rope accordingly when it rotates forward or backward.

16. The fatigue durability testing equipment for bent pipes according to claim 15, characterized in that, The rotating component has an annular groove on its peripheral sidewall for accommodating the traction rope, and a through hole on its end face for the end of the traction rope to pass through. The rotating component has a pressure plate at the position corresponding to the through hole for pressing and fixing the end of the traction rope.

17. The fatigue durability testing equipment for bent pipes according to claim 1, characterized in that, The first detection unit includes a laser sensor, which is disposed on the test bench and is used to detect the actual bending parameters of the bending segment.

18. The fatigue durability testing equipment for bent pipes according to claim 17, characterized in that, The testing mechanism also includes a base disposed on the test bench, the position of which relative to the curved tube in the radial direction is adjustable; wherein the laser sensor is disposed on the base.

19. The fatigue durability testing equipment for bent pipes according to claim 17, characterized in that, The traction unit includes a rotatable component for two traction ropes to be wound from different directions, so that when their directions are opposite, different traction ropes are pulled, so that the curved section has two bending states with different bending directions; the detection unit includes two laser sensors, which are arranged side by side in the radial direction of the curved tube, for detecting the curved section in different bending states respectively.

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