Bending performance testing tool and bending performance testing system

Abstract

The utility model discloses a bending performance testing tool and a bending performance testing system. The bending performance testing tool comprises a measuring device, a pressing plate assembly and a dovetail groove sliding table. The pressing plate assembly is arranged between the measuring device and the dovetail groove sliding table; the horizontal axis of the pressing plate assembly is perpendicular to the vertical axis of the measuring device. The pressing plate assembly comprises a first pressing plate and a second pressing plate which are oppositely arranged; the first pressing plate is arranged between the measuring device and the second pressing plate; the first pressing plate is detachably connected with the measuring device; a dovetail groove sliding table is arranged on the side, away from the first pressing plate, of the second pressing plate. The second pressing plate is detachably connected with the dovetail groove sliding table; a first notch groove is formed in the side, close to the second pressing plate, of the first pressing plate. A second notch groove is formed in the side, close to the first pressing plate, of the second pressing plate. A to-be-tested piece is arranged between the first pressing plate and the second pressing plate; one end of the to-be-tested piece is embedded into the first notch groove; and the other end of the to-be-tested piece is embedded into the second notch groove. And the accuracy and the reliability of the bending performance test result of the to-be-tested piece are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical equipment technical field especially, it relates to a kind of bending performance test tool and bending performance test system. BACKGROUND

[0002] In intracranial vascular interventional therapy, human blood vessels are accessed from femoral artery or radial artery, and enter the intracranial vascular anterior and posterior circulation through aortic arch. Due to the differences in the inner diameter of the blood vessels and the tortuosity of the blood vessels, different bending forces and bending forces are required for the instruments. The instruments should not be bent due to the tortuosity when passing through the corresponding blood vessels. At the same time, the pressure on the blood vessels caused by the bending of the instruments should not cause damage to the blood vessels.

[0003] Interventional catheters and guide wires are usually designed in sections. The near section pursues pushability, the middle section requires supportability, and the far section requires flexibility to meet the requirements of the instruments passing through the tortuous blood vessels. Therefore, the bending force, bending force, bending force and bending distance of different sections have different requirements in the design stage.

[0004] However, in actual measurement, the head length of the guide wire catheter in the prior art may be extended, the guide wire catheter cannot meet the shape and size requirements of the sample block in the test standard, and the test process is not continuous, the bending force value under different bending conditions cannot be recorded, and the test result cannot effectively reflect the bending performance of the guide wire catheter. UTILITY MODEL CONTENT

[0005] To solve the technical problems in the background art, the utility model provides a bending performance test tool and a bending performance test system. The bending performance test tool comprises a measuring device, a pressing plate assembly and a dovetail groove sliding table.

[0006] The pressing plate assembly is arranged between the measuring device and the dovetail groove sliding table. The horizontal axis of the pressing plate assembly is perpendicular to the vertical axis of the measuring device. The pressing plate assembly comprises a first pressing plate and a second pressing plate arranged opposite to each other. The first pressing plate is parallel to the second pressing plate. The first pressing plate is arranged between the measuring device and the second pressing plate. The first pressing plate is detachably connected to the measuring device. The second pressing plate is provided with the dovetail groove sliding table on the side away from the first pressing plate. The second pressing plate is detachably connected to the dovetail groove sliding table.

[0007] The first pressing plate is provided with a first notch on the side close to the second pressing plate. The second pressing plate is provided with a second notch on the side close to the first pressing plate. A to-be-tested member is arranged between the first pressing plate and the second pressing plate. One end of the to-be-tested member is embedded in the first notch. The other end of the to-be-tested member is embedded in the second notch.

[0008] Further, the first and second grooves are V-shaped grooves; the first pressing plate is provided with a plurality of the first grooves; each of the first grooves has a different opening width; the second pressing plate is provided with a plurality of the second grooves; each of the second grooves has a different opening width.

[0009] Further, the measuring device comprises a force value sensor and a connecting assembly; the connecting assembly is arranged between the force value sensor and the first pressing plate; a side of the force value sensor close to the connecting assembly is detachably connected with the connecting assembly; a side of the connecting assembly close to the first pressing plate is detachably connected with the first pressing plate.

[0010] Further, the connecting assembly comprises a connecting vertical rod and a connecting horizontal rod.

[0011] The connecting vertical rod is arranged between the force value sensor and the connecting horizontal rod; a vertical axis of the connecting vertical rod is on the same straight line as a vertical axis of the force value sensor; the connecting horizontal rod is perpendicular to the connecting vertical rod; the connecting vertical rod is arranged at a central position of the connecting horizontal rod and is fixedly connected with the connecting horizontal rod.

[0012] Further, a side of the force value sensor close to the connecting vertical rod is provided with an internally threaded hole; a side of the connecting vertical rod close to the force value sensor is provided with an externally threaded hole; the externally threaded hole comprises a first connecting thread and a second connecting thread; the first connecting thread is fixedly connected with the second connecting thread; the first connecting thread is arranged between the force value sensor and the second connecting thread; a shape of the internally threaded hole matches a shape of the first connecting thread; the first connecting thread is threadedly connected with the internally threaded hole; an outer side of the second connecting thread is sleeved with a nut; the second connecting thread is threadedly connected with the nut.

[0013] Further, the connecting horizontal rod is arranged between the connecting vertical rod and the first pressing plate; a side of the connecting horizontal rod close to the first pressing plate is provided with a first threaded hole and a second threaded hole; the first threaded hole penetrates one end of the connecting horizontal rod; the second threaded hole penetrates the other end of the connecting horizontal rod.

[0014] A side of the first pressing plate close to the connecting horizontal rod is provided with a first countersunk hole and a second countersunk hole; the first countersunk hole is boltedly connected with the first threaded hole through a first bolt; the second countersunk hole is boltedly connected with the second threaded hole through a second bolt.

[0015] Further, the side of the first pressing plate comprises a first side and a plurality of first remaining sides; the first side of the first pressing plate is provided with a first scale; a length value of the first side is greater than or equal to a length value of each of the first remaining sides.

[0016] The side of the second pressing plate comprises a second side and a plurality of second remaining sides; the second side of the second pressing plate is provided with a second scale; the length value of the second side is greater than or equal to the length value of each of the second remaining sides.

[0017] Further, the dovetail groove sliding table is bolted with the second pressing plate through at least one third bolt; the side of the second pressing plate close to the dovetail groove sliding table is provided with a third countersunk hole matched with the third bolt.

[0018] Further, the side of the second pressing plate close to the first pressing plate is provided with a limiting block; the shape of the limiting block is matched with the shape of the second pressing plate; the limiting block is slidingly connected with the second pressing plate.

[0019] The utility model also provides a bending performance test system, including a tension machine and the test tool as described above;

[0020] The tension machine comprises a base, a frame and a tension beam; the base is perpendicular to the frame; the top of the base is fixedly connected with the bottom of the frame; the side of the frame away from the base is slidingly connected with the tension beam; the tension beam is parallel to the base; the test tool is arranged on the side of the tension beam away from the frame; the test tool is detachably connected with the bottom of the tension beam; the test tool is parallel to the frame.

[0021] The utility model has the advantages of:

[0022] The utility model discloses a bending performance test tool and bending performance test system, including measuring device, pressing plate subassembly and dovetail groove sliding table, the pressing plate subassembly sets up between the measuring device with the dovetail groove sliding table, the horizontal axis of pressing plate subassembly with the vertical axis of measuring device is perpendicular, the pressing plate subassembly includes the first pressing plate and second pressing plate of opposite setting, the first pressing plate with the second pressing plate is parallel, the first pressing plate sets up between the measuring device with the second pressing plate, the first pressing plate with the measuring device is detachably connected, the second pressing plate is provided with the dovetail groove sliding table on the side away from the first pressing plate, the second pressing plate with the dovetail groove sliding table is detachably connected, the first pressing plate is provided with the first slot on the side close to the second pressing plate, the second pressing plate is provided with the second slot on the side close to the first pressing plate, and the first pressing plate is provided with the second pressing plate between the second pressing plate and the second pressing plate, and one end of the second pressing plate is embedded in the first slot, the other end of the second pressing plate is embedded in the second slot, through setting up the dovetail groove sliding table, the initial position of the second pressing plate is set up through the dovetail groove sliding table before testing, so that the second pressing plate can be installed in the correct position, the deviation of the result of measuring device test is reduced, and the accuracy of the bending performance test result of the second pressing plate is improved, through setting up the first slot on the first pressing plate and setting up the second slot on the second pressing plate, so that the two ends of the second pressing plate are embedded in the first slot and the second slot respectively, and the second pressing plate is not easy to bend, the second pressing plate is prevented from slipping in the horizontal direction, the accuracy and reliability of the bending performance test result of the second pressing plate measured by the measuring device are improved, and the test efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme of the utility model, the following will be to the embodiment or prior art description needed to use the drawing briefly introduced, obviously, the following description in the drawing is only some embodiments of the utility model, for those skilled in the art, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings.

[0024] Figure 1 It is a kind of bending performance test tool schematic diagram provided by the utility model;

[0025] Figure 2 It is a kind of second pressing plate schematic diagram provided by the utility model;

[0026] Figure 3 It is a kind of first pressing plate schematic diagram provided by the utility model in;

[0027] Figure 4 It is a kind of tension machine schematic diagram provided by the utility model in;

[0028] Figure 5 It is a kind of bending performance test system schematic diagram provided by the utility model;

[0029] Figure 6 Fig. 1 is a schematic view of the initial state of the measured member provided by the utility model;

[0030] Figure 6 Fig. 2 is a schematic view of the bending state of the measured member provided by the utility model;

[0031] Figure 6 Fig. 3 is a schematic view of the bending failure state of the measured member provided by the utility model;

[0032] Figure 7 Fig. 4 is a schematic view of the bending force change with displacement of the measured member provided by the utility model;

[0033] Figure 8 Fig. 5 is a partial cross-sectional schematic view of the bending performance test tool provided by the utility model;

[0034] In the figure, the reference signs correspond to: 1-measuring device, 2-pressing plate assembly, 3-dovetail groove sliding table, 4-first pressing plate, 5-second pressing plate, 6-first notch, 7-second notch, 8-measured member, 9-force value sensor, 10-connection assembly, 11-connection vertical rod, 12-connection horizontal rod, 13-first scale, 14-second scale, 15-limiting block, 16-tension machine, 17-base, 18-rack, 19-tension beam, 20-internal thread hole, 21-external thread, 22-first connection thread, 23-second connection thread, 24-nut, 25-first thread hole, 26-second thread hole, 27-first countersunk hole, 28-second countersunk hole, 29-first bolt, 30-second bolt. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0036] In the description of the utility model, need understanding is, the term "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" "internal", "external", "clockwise", "counterclockwise", "axial", "radial", "circumferential" orientation or positional relationship indicated in the drawing is based on the orientation or positional relationship shown in the drawing, just for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, since the disclosed embodiments of the utility model can be arranged in different directions, so these directional terms are only as an illustration and should not be regarded as a limitation, for example, "upper", "lower" are not necessarily limited to the direction opposite or consistent with the direction of gravity. In addition, the features defined as "first", "second" can explicitly or implicitly include one or more features.

[0037] As Figures 1-7 The utility model provides a kind of bending performance test tool and bending performance test system, including measuring device 1, pressing plate component 2 and dovetail groove sliding table 3;

[0038] The above-mentioned pressing plate component 2 is arranged between the above-mentioned measuring device 1 and the above-mentioned dovetail groove sliding table 3;The horizontal axis of the above-mentioned pressing plate component 2 is perpendicular to the vertical axis of the above-mentioned measuring device 1;The above-mentioned pressing plate component 2 includes oppositely arranged first pressing plate 4 and second pressing plate 5;The above-mentioned first pressing plate 4 is parallel to the above-mentioned second pressing plate 5;The above-mentioned first pressing plate 4 is arranged between the above-mentioned measuring device 1 and the above-mentioned second pressing plate 5;The above-mentioned first pressing plate 4 is detachably connected with the above-mentioned measuring device 1;The side of the above-mentioned second pressing plate 5 away from the above-mentioned first pressing plate 4 is provided with the above-mentioned dovetail groove sliding table 3;The above-mentioned second pressing plate 5 is detachably connected with the above-mentioned dovetail groove sliding table 3;

[0039] The side of the above-mentioned first pressing plate 4 close to the above-mentioned second pressing plate 5 is provided with first notch 6;The side of the above-mentioned second pressing plate 5 close to the above-mentioned first pressing plate 4 is provided with second notch 7;The above-mentioned first pressing plate 4 and the above-mentioned second pressing plate 5 are provided with test piece 8;One end of the above-mentioned test piece 8 is embedded in the above-mentioned first notch 6;The other end of the above-mentioned test piece 8 is embedded in the above-mentioned second notch 7.

[0040] In some embodiments, the test piece 8 can be a guide wire or a conduit; the measuring device 1, the pressure plate assembly 2, and the dovetail slide 3 can be arranged vertically from top to bottom; the first pressure plate 4 can be an upper pressure plate made of polyoxymethylene (POM); the second pressure plate 5 can be a lower pressure plate made of polyoxymethylene; the first groove 6 is a groove provided on the inner surface of the first pressure plate 4, that is, a groove provided on the side of the first pressure plate 4 near the second pressure plate 5; the second groove 7 is a groove provided on the inner surface of the second pressure plate 5, that is, a groove provided on the side of the second pressure plate 5 near the first pressure plate 4; the surfaces of the first groove 6 and the second groove 7 can both be etched surfaces with large roughness or ordinary grooves with surface roughness that meet the anti-slip requirements, thereby increasing the surface friction coefficient and reducing the slippage phenomenon of the test piece 8 during the test; before the test, if the outer diameter of the test piece 8 is uniform, the second pressure plate 5 can be adjusted in the horizontal direction by adjusting the adjustment knob on the dovetail slide 3, such as Figure 1 As shown, with the direction of the slide groove above the dovetail slide table 3 as the Y-axis direction and the direction of the slide groove below the dovetail slide table 3 as the X-axis direction, the button above the dovetail slide table 3 is an adjustment button for adjusting the position of the second pressure plate 5 in the horizontal Y-axis direction, and the button below is an adjustment button for adjusting the position of the second pressure plate 5 in the horizontal X-axis direction. Adjusting these two buttons makes the edge of the first pressure plate 4 and the edge of the second pressure plate 5 horizontally aligned, so that the first groove 6 and the second groove 7 with the same opening width are vertically opposite each other, and the first groove 6 and the second groove 7 with the same opening width combine to form a rhombus shape; if to be If the outer diameter of the measuring piece 8 is uneven, the second pressure plate 5 can be adjusted horizontally by adjusting the adjustment knob on the dovetail slide 3, so that the first groove 6 accommodating one end of the measuring piece 8 and the second groove 7 accommodating the other end of the measuring piece 8 are aligned vertically. It is understood that regardless of whether the outer diameter of the measuring piece 8 is uniform, the horizontal axis of the portion of the measuring piece 8 embedded in the first groove 6 and the horizontal axis of the portion of the measuring piece 8 embedded in the second groove 7 are located in the same vertical plane. After the position of the second pressure plate 5 is adjusted, it can be locked in place by adjusting the locking screw on the dovetail slide 3. For example, as shown... Figure 6 As shown in Figure A, the test piece 8 is in its initial placement state. At this time, one end of the test piece 8 is horizontally placed in the first groove 6 on the first pressure plate 4, and the other end of the test piece 8 is horizontally placed in the second groove 7 on the second pressure plate 5. The test piece 8 is not under any force, and the middle part is vertically positioned. During the test, as... Figure 6 China B map and Figure 6 As shown in Figure C, it can be seen Figure 6 The test piece 8 in Figure B is already in a bent state. Figure 6In Figure C, the test piece 8 is already in a bending failure state. The bending force of the test piece 8 is detected by the measuring device 1 to obtain the bending performance test results of the test piece 8. It can be seen that by setting the dovetail groove slide, the conditions can be ensured to be consistent for each test, reducing the deviation caused by the installation and placement offset of the test piece in the bending performance test results, and ensuring the accuracy of the measurement results. In addition, the setting of the first groove and the second groove extends the service life of the etching groove, increases the roughness of the groove surface, ensures that the position of the test piece in the V-groove is more stable, avoids the horizontal slippage of the test piece due to the force, and meets the consistency requirements of the test conditions.

[0041] The first groove 6 and the second groove 7 are both V-shaped grooves; the first pressure plate 4 is provided with a plurality of the first grooves 6; the opening width of each of the first grooves 6 is different; the second pressure plate 5 is provided with a plurality of the second grooves 7; the opening width of each of the second grooves 7 is different.

[0042] In some embodiments, such as Figures 1-3 As shown, both the first groove 6 and the second groove 7 are V-shaped grooves. Furthermore, there can be multiple first grooves 6 and multiple second grooves 7, and the number of first grooves 6 and second grooves 7 can be the same. The opening widths of different first grooves 6 are different to accommodate guidewires or catheters of different outer diameters. Specifically, these can be 10-series guidewires to 9F-series catheters. The 10-series guidewires refer to guidewires with an outer diameter of 0.010 inches, approximately 0.254 millimeters. These guidewires are widely used in the medical field, especially in cardiovascular interventional surgery. Because the outer diameter of the 10-series guidewires is very small, a narrower V-shaped groove is needed to ensure stable placement during testing. The 9F-series catheters refer to catheters with an outer diameter of 9 French units (F), where 1 French unit equals 0.33 millimeters. The outer diameter of the 9F catheter is approximately 3.0 mm. As a relatively large diameter catheter, the 9F catheter is commonly used in interventional radiology and cardiovascular surgery. Compared to the 10-series guidewires, the 9F catheter has a much larger outer diameter, thus requiring a wider V-groove to ensure stability and accuracy during testing. Similarly, the opening widths of different second grooves 7 vary to accommodate guidewires or catheters of different outer diameters, specifically, from 10-series guidewires to 9F-series catheters. Before actual testing, if the outer diameter of the test piece 8 is uniform, the first groove 6 and second groove 7 with the same opening width correspond vertically, allowing them to combine to form a rhombus shape. If the outer diameter of the test piece 8 is not uniform, the first groove 6 and second groove 7 with different opening widths can correspond vertically. By setting multiple first grooves with different opening widths on the first pressure plate and multiple second grooves with different opening widths on the second pressure plate, the testing requirements for test pieces with different outer diameters are met.

[0043] The utility model discloses a measuring device 1 includes force value sensor 9 and connecting assembly 10, connecting assembly 10 is set between force value sensor 9 and first pressing plate 4, and the side of force value sensor 9 close to connecting assembly 10 is detachably connected with connecting assembly 10, and the side of connecting assembly 10 close to first pressing plate 4 is detachably connected with first pressing plate 4.

[0044] In some embodiments, as shown in Figure 1 、 Figure 5 Connecting assembly 10 can be made of 7075 aluminum alloy, and force value sensor 9, connecting assembly 10 and first pressing plate 4 can be arranged vertically from top to bottom. Force value sensor 9 and first pressing plate 4 are connected through connecting assembly 10, so that force value sensor 9 can detect the force value of the test piece 8 in each stage. By setting the connecting assembly to connect the force value sensor and the first pressing plate, the installation and disassembly process is simplified, the stability of the test tool is enhanced, the service life of the test tool is prolonged, the force applied to the test piece can be accurately transmitted to the force value sensor, and the accuracy and reliability of the test result of the bending performance of the test piece are improved.

[0045] In other embodiments, the material of connecting assembly 10 can be set according to actual conditions.

[0046] The utility model discloses a connecting assembly 10 includes connecting vertical rod 11 and connecting cross rod 12.

[0047] Connecting vertical rod 11 is set between force value sensor 9 and connecting cross rod 12, the vertical axis of connecting vertical rod 11 and the vertical axis of force value sensor 9 are on the same straight line, connecting cross rod 12 is perpendicular to connecting vertical rod 11, connecting vertical rod 11 is set at the center position of connecting cross rod 12, and connecting vertical rod 11 is fixedly connected with connecting cross rod 12.

[0048] In some embodiments, as shown in Figure 1 、 Figure 5As shown, the connecting assembly 10 can be in an inverted "T" shape structure in vertical and horizontal directions, specifically, the connecting vertical rod 11 is arranged in a vertical direction, the connecting horizontal rod 12 is arranged in a horizontal direction, and one end of the connecting vertical rod 11 is arranged adjacent to the force value sensor 9, and the other end of the connecting vertical rod 11 is arranged adjacent to the connecting horizontal rod 12; the vertical axis of the connecting vertical rod 11 and the vertical axis of the force value sensor 9 are located on the same straight line, so that the force applied to the measured piece 8 can be directly transmitted to the force value sensor 9, without causing force dispersion or loss due to deviation or angle deviation, and avoiding introducing additional friction or bending stress; at the same time, the connecting vertical rod 11 is arranged at the central position of the connecting horizontal rod 12, that is, the middle part of the connecting horizontal rod 12, so that the connecting vertical rod 11 and the connecting horizontal rod 12 are fixedly connected to form an inverted "T" shape structure, and the connecting vertical rod 11 arranged at the central position of the connecting horizontal rod 12 can reduce the influence of the gravity center deviation of the connecting assembly 10 on the detection result of the force value sensor 9 during the test. By arranging the inverted "T" shaped connecting assembly, the measurement axis of the force value sensor and the stress point of the upper pressing plate are always kept vertical and centered, the loss in the bending force transmission process of the measured piece is reduced, and the accuracy of the bending performance test result of the measured piece is improved; at the same time, the modular design of the connecting assembly makes it easy to maintain and replace, and improves the work efficiency.

[0049] In the utility model, the force value sensor 9 is provided with an internal thread hole 20 on one side close to the connecting vertical rod 11; the connecting vertical rod 11 is provided with an external thread 21 on one side close to the force value sensor 9; the external thread 21 comprises a first connecting thread 22 and a second connecting thread 23; the first connecting thread 22 is fixedly connected with the second connecting thread 23; the first connecting thread 22 is arranged between the force value sensor 9 and the second connecting thread 23; the shape of the internal thread hole 20 matches the shape of the first connecting thread 22; the first connecting thread 22 is in threaded connection with the internal thread hole; the second connecting thread 23 is provided with a nut 24 on the outside; the second connecting thread 23 is in threaded connection with the nut 24.

[0050] In some embodiments, as Figure 8As shown, the force value sensor 9 is arranged close to the side of the connecting vertical rod 11, i.e. the lower side of the force value sensor 9 is provided with an internal threaded hole 20; the side of the connecting vertical rod 11 close to the force value sensor 9, i.e. the upper side of the connecting vertical rod 11 is provided with an external thread 21, the external thread 21 is fixedly connected by a first connecting thread 22 and a second connecting thread 23, the first connecting thread 22 is arranged between the force value sensor 9 and the second connecting thread 23; the outer side of the second connecting thread 23 is sleeved with a nut 24, and the effective thread length of the external thread 21 is greater than 1.5 times the thread diameter except for the length occupied by the nut 24; in fact, the shape of the entire external thread 21 matches the shape of the internal threaded hole 20, however, in order to prevent the external thread 21 of the connecting vertical rod 11 from being excessively tightened to damage the force value sensor 9, only the first connecting thread 22 is threadedly connected with the internal threaded hole 20, and the first connecting thread 22 is stopped from being screwed in after being threadedly connected with the internal threaded hole 20, and then the nut 24 is tightened to realize the thread connection between the nut 24 and the second connecting thread 23, so as to realize the connection between the force value sensor 9 and the connecting vertical rod 11. By arranging the internal threaded hole on the force value sensor and the external thread on the connecting vertical rod, the force value sensor and the connecting vertical rod are tightly connected; by arranging the reasonable screwing depth of the external thread and cooperating with the nut to realize the final fixation, the relative position between the connecting vertical rod and the force value sensor is kept consistent during each installation, the maintenance operation is simplified, the connecting vertical rod is prevented from being excessively tightened, mechanical damage to the force value sensor is avoided, and the service life of the test tool is prolonged.

[0051] In the utility model, the connecting horizontal rod 12 is arranged between the connecting vertical rod 11 and the first pressing plate 4; the side of the connecting horizontal rod 12 close to the first pressing plate 4 is provided with a first threaded hole 25 and a second threaded hole 26; the first threaded hole 25 penetrates one end of the connecting horizontal rod 12; the second threaded hole 26 penetrates the other end of the connecting horizontal rod 12;

[0052] The side of the first pressing plate 4 close to the connecting horizontal rod 12 is provided with a first countersunk hole 27 and a second countersunk hole 28; the first countersunk hole 27 is boltedly connected with the first threaded hole 25 through a first bolt 29; the second countersunk hole 28 is boltedly connected with the second threaded hole 26 through a second bolt 30.

[0053] In some embodiments, as Figure 8As shown, the two ends of the connecting cross bar 12 are respectively provided with a first threaded hole 25 and a second threaded hole 26, the first threaded hole 25 is used for connecting with one side of the first pressing plate 4, the second threaded hole 26 is used for connecting with the other side of the first pressing plate 4, and the first threaded hole 25 penetrates one end of the first pressing plate 4, and the second threaded hole 26 penetrates the other end of the first pressing plate 4. The two ends of the first pressing plate 4 are respectively provided with a first countersunk hole 27 and a second countersunk hole 28, the first threaded hole 25 corresponds to the first countersunk hole 27, the center axis of the first threaded hole 25 and the center axis of the first countersunk hole 27 are located on the same straight line, the second threaded hole 26 corresponds to the second countersunk hole 28, the center axis of the second threaded hole 26 and the center axis of the second countersunk hole 28 are located on the same straight line, a first bolt 29 is arranged at the position of the first countersunk hole 27, the first bolt 29 penetrates the first countersunk hole 27 on the first pressing plate 4 and is screwed into the first threaded hole 25 on the connecting cross bar 12, a second bolt 30 is arranged at the position of the second countersunk hole 28, the second bolt 30 penetrates the second countersunk hole 28 on the first pressing plate 4 and is screwed into the second threaded hole 26 on the connecting cross bar 12, so that the connection between the connecting cross bar 12 and the first pressing plate 4 is realized. By arranging a threaded hole at each end of the connecting cross bar, the connecting cross bar and the first pressing plate are connected, the reliability and stability of the connection between the connecting cross bar and the first pressing plate are enhanced, the structure of multi-point fixation can effectively disperse the pressure borne by the connecting cross bar, and the service life of the connecting assembly and the test tool is prolonged. By arranging a countersunk hole at each end of the first pressing plate, the head of the bolt can be completely embedded in the first pressing plate, so that the bolt head is prevented from protruding and affecting the flatness and stress uniformity of the first pressing plate. Meanwhile, the design of multiple bolts significantly enhances the connection rigidity between the first pressing plate and the connecting cross bar, prevents loosening or displacement during the test, and ensures the stability and reliability of the test result of the bending performance of the to-be-tested member.

[0054] In the utility model, the side of the first pressing plate 4 includes a first side and a plurality of first remaining sides, the first side of the first pressing plate 4 is provided with a first scale 13, and the length of the first side is greater than or equal to the length of each first remaining side.

[0055] The side of the second pressing plate 5 includes a second side and a plurality of second remaining sides, the second side of the second pressing plate 5 is provided with a second scale 14, and the length of the second side is greater than or equal to the length of each second remaining side.

[0056] In some embodiments, as Figures 1-2As shown, the first side can be the front of the first pressing plate 4, the first remaining side can be all the remaining sides of the first pressing plate 4, and the length value of the first side is greater than or equal to the length value of each of the first remaining sides of the first pressing plate 4; the second side can be the front of the second pressing plate 5, the second remaining side can be all the remaining sides of the second pressing plate 5, and the length value of the second side is greater than or equal to the length value of each of the second remaining sides of the second pressing plate 5; when the outer diameter of the to-be-tested member 8 is uniform, the first scale 13 and the second scale 14 are aligned in the vertical direction, and the scale range of the first scale 13 can be the same as the scale range of the second scale 14, and the user can set the specific scale range according to the actual situation. Before testing, when the outer diameter of the to-be-tested member 8 is uniform, the user can adjust the position of the second pressing plate 5 in the horizontal direction by adjusting the adjusting knob on the dovetail groove sliding table 3, so that the first pressing plate 4 and the second pressing plate 5 are aligned, and then the scale line of the first scale 13 and the scale line of the second scale 14 are aligned, at this time the user can place the two ends of the to-be-tested member 8 to be tested at different scales of the first pressing plate 4 and the second pressing plate 5 according to the demand, and the user can obtain the placement position of the to-be-tested member 8 to be tested in time. By setting the first scale on the first pressing plate and the second scale on the second pressing plate, the user can select the appropriate scale position according to the actual length of the measured product section, reducing the error caused by inaccurate human judgment, simplifying the operation process, improving the work efficiency, improving the repeatability of the test and the accuracy of the test result of the to-be-tested member bending performance.

[0057] In the utility model, the dovetail groove sliding table 3 is bolted to the second pressing plate 5 through at least one third bolt; the second pressing plate 5 is provided with a third countersunk hole matched with the third bolt on the side close to the dovetail groove sliding table 3.

[0058] In some embodiments, the third countersunk hole can be multiple, for example, four, and the third countersunk hole can be arranged at the middle position of the side of the second pressing plate 5 close to the dovetail slot sliding table 3, so as to ensure that the force applied by the first pressing plate 4 is evenly distributed on the entire second pressing plate 5, which helps to avoid local stress concentration caused by uneven distribution of force, thereby reducing the deformation or damage of the second pressing plate 5; similarly, the third bolt can be multiple, and the number of the third countersunk hole is also four; the side of the dovetail slot sliding table 3 close to the second pressing plate 5 can be provided with four threaded holes, each third countersunk hole and each threaded hole on the dovetail slot sliding table 3 correspond one by one, and are fixed by the third bolt, finally realizing the connection between the second pressing plate 5 and the dovetail slot sliding table 3. By arranging the third countersunk hole on the second pressing plate, the head of the third bolt is completely embedded in the second pressing plate, avoiding the head of the third bolt protruding and affecting the flatness and stress uniformity of the second pressing plate; at the same time, multiple third bolts are arranged to realize the fixation of the second pressing plate and the dovetail slot sliding table, effectively dispersing the stress borne by the second pressing plate, prolonging the service life of the test tool, significantly enhancing the connection rigidity between the second pressing plate and the dovetail slot sliding table, preventing loosening or displacement during testing, and ensuring the stability and reliability of the test results of the bending performance of the test piece.

[0059] In the utility model, the side of the second pressing plate 5 close to the first pressing plate 4 is provided with a limiting block 15; the shape of the limiting block 15 matches the shape of the second pressing plate 5; the limiting block 15 is in sliding connection with the second pressing plate 5.

[0060] In some embodiments, as shown in Figures 1-2 The limiting block 15 is a movable limiting sliding block, and is installed on the side of the second pressing plate 5 close to the first pressing plate 4; the shape of the limiting block 15 matches the shape of the second pressing plate 5; the limiting block 15 is in sliding connection with the second pressing plate 5; when one end of the test piece 8 to be tested is placed on the second pressing plate 5, the end placed in the second groove 7 abuts against the limiting block 15; at this time, the set screws at both ends of the limiting block 15 are tightened, so that the limiting block 15 and the end of the test piece 8 placed in the second groove 7 are firmly fixed on the second pressing plate 5, preventing movement during testing, so as to realize the cooperation between the limiting block 15 and the second groove 7, so that the limiting block 15 and the end of the test piece 8 placed in the second groove 7 are fixed during testing, effectively limiting the movement of the test piece to be tested in the horizontal direction, simplifying the operation process, reducing the measurement error caused by position deviation, ensuring the stability of the test tool, and improving the accuracy and repeatability of the test results of the bending performance of the test piece.

[0061] In other embodiments, the shape of the limiting block 15 can be set according to actual conditions, but needs to be able to match the shape of the second pressing plate 5 and be able to cooperate with the second slot 7 to slide.

[0062] In an exemplary embodiment, as shown in Figures 4-5 the utility model also provides a bending performance test system, including tension machine 16 and above -mentioned test tooling,

[0063] The tension machine 16 includes a base 17, a frame 18 and a tension beam 19, the base 17 is perpendicular to the frame 18, the top of the base 17 is fixedly connected to the bottom of the frame 18, the side of the frame 18 away from the base 17 is slidably connected to the tension beam 19, the tension beam 19 is parallel to the base 17, the test tooling is arranged on the side of the tension beam 19 away from the frame 18, the test tooling is detachably connected to the bottom of the tension beam 19, and the test tooling is parallel to the frame 18.

[0064] In some embodiments, the base 17 is arranged along the horizontal direction, the frame 18 is arranged along the vertical direction, the bottom of the frame 18 is fixedly connected to the top of the base 17, the tension beam 19 is arranged on the side of the frame 18 away from the base 17, and the tension beam 19 is parallel to the base 17 and arranged along the horizontal direction, the test tooling is arranged on the bottom of the tension beam 19, and the top of the force value sensor 9 in the test tooling is detachably connected to the bottom of the tension beam 19. During testing, the tension machine 16 sets the pressing speed and pressing distance of the first pressing plate 4, wherein, before testing, the initial distance between the dovetail slot sliding table 3 and the first pressing plate 4 and the second pressing plate 5 is set, and the time interval is defined as zero position after the to-be-tested workpiece 8 is placed, the first pressing plate 4 is pressed based on the pressing speed and pressing distance set by the tension machine 16, so as to apply pressure to the to-be-tested workpiece 8 to be tested and make it bend, as shown in Figure 6 , the to-be-tested workpiece 8 first changes from the initial state, i.e. the state of Fig. A in Figure 6 , to the bending state, i.e. the state of Fig. B in Figure 6 , and then to the bending failure state, i.e. the state of Fig. C in Figure 6 , and the force value sensor 9 continuously detects the bending force of the to-be-tested workpiece 8 during the process, and the feedback of the force value detected by the force value sensor 9 can be described by a force value curve as shown in Figure 7 , Fig. Figure 7 , wherein, the abscissa represents the pressing displacement of the first pressing plate 4, Figure 7 , and the ordinate represents the pressure value of the to-be-tested workpiece 8. Figure 7 , and the ordinate represents the pressure value of the to-be-tested workpiece 8. Figure 7Point A in the middle represents the buckling point of the test piece 8, that is, the position where the test piece 8 begins to buckle; Figure 7 Point B in the middle represents the bending section of the test piece 8, showing the bending process and stress of the test piece 8 under different displacements; Figure 7 Point C in the diagram represents the bending point of the test piece 8, i.e., the location where the test piece 8 undergoes significant bending. Simultaneously, the force value feedback of the test piece 8 detected by the force sensor 9 is combined with the recording of the vertical displacement of the first pressure plate 4 set in the tensile testing machine 16 to obtain the bending performance test result of the test piece 8.

[0065] The working principle of the bending performance testing fixture and bending performance testing system of this utility model is as follows:

[0066] Before testing, the position of the second pressure plate 5 is adjusted by adjusting the adjustment knob on the dovetail slide 3, so that the first groove 6 matching one end of the test piece 8 and the second groove 7 matching the other end of the test piece 8 are vertically aligned. The tensile testing machine 16 is used to adjust the initial distance between the first pressure plate 4 and the second pressure plate 5 according to the test requirements. One end of the test piece 8 is placed horizontally on the first groove 6 of the first pressure plate 4, which is adapted to its size. The other end of the test piece 8 is placed horizontally on the second groove 7 of the second pressure plate 5, which is adapted to its size. The rest is placed vertically between the first pressure plate 4 and the second pressure plate 5.

[0067] During testing, the pressing speed and distance of the first pressure plate 4 are set by the tensile testing machine 16 to control the pressing of the first pressure plate 4. When initially subjected to force, the test piece 8 transitions from the initial state to the buckling state, and then enters the bending state until the first pressure plate 4 is pressed down to the pressing distance set by the tensile testing machine 16. At this point, the test piece 8 exhibits a bending failure state. Throughout the pressing process, the force sensor 9 continuously records the force feedback of the test piece 8 in real time. In conjunction with the vertical displacement recording of the tensile testing machine 16, the bending force value of the test piece 8 at different bending intervals is obtained to determine the bending performance of the test piece 8.

[0068] The beneficial effects of this utility model are:

[0069] The utility model discloses a bending performance test frock and bending performance test system, including measuring device, pressing plate subassembly and dovetail groove sliding table, pressing plate subassembly sets up between measuring device and dovetail groove sliding table, the horizontal axis of pressing plate subassembly is perpendicular with the vertical axis of measuring device, and pressing plate subassembly includes first pressing plate and second pressing plate of relative arrangement, and first pressing plate and second pressing plate are parallel, and first pressing plate sets up between measuring device and second pressing plate, and first pressing plate and measuring device are detachably connected, and the side of second pressing plate away from first pressing plate is provided with dovetail groove sliding table, and second pressing plate and dovetail groove sliding table are detachably connected, and the side of first pressing plate close to second pressing plate is provided with first slot, and the side of second pressing plate close to first pressing plate is provided with second slot, and the first pressing plate and second pressing plate are provided with the piece to be measured between, and one end of piece to be measured is embedded in first slot, and the other end of piece to be measured is embedded in second slot. Through setting up dovetail groove sliding table makes the first slot matched with one end of piece to be measured and the second slot matched with the other end of piece to be measured align in vertical direction, and utilizes the initial spacing between first pressing plate and second pressing plate according to test demand to adjust tensile machine, can test the bending performance of different length piece to be measured, improves the accuracy and repeatability of piece to be measured bending performance measurement result, through setting up first slot of the surface roughness greater on first pressing plate and setting up second slot of the surface roughness greater on second pressing plate, avoid piece to be measured to slip in horizontal direction, through setting up tensile machine and force value sensor cooperation, it is helpful to obtain the bending performance of piece to be measured test whole process, satisfies continuity test demand.

[0070] The above is the preferred embodiment of the utility model, it should be pointed out, for ordinary technical personnel in the prior art, on the premise of not departing from the principles of the utility model, can also make a number of improvements and refinements, these improvements and refinements also be considered as the protection scope of the utility model.

Claims

1. A bend performance test fixture characterized by, The measurement device, the pressing plate assembly and the dovetail groove sliding table are included. The pressing plate assembly is arranged between the measurement device and the dovetail groove sliding table; the horizontal axis of the pressing plate assembly is perpendicular to the vertical axis of the measurement device; the pressing plate assembly includes oppositely arranged first and second pressing plates; the first and second pressing plates are parallel; the first pressing plate is arranged between the measurement device and the second pressing plate; the first pressing plate is detachably connected with the measurement device; the second pressing plate is arranged with the dovetail groove sliding table on the side away from the first pressing plate; the second pressing plate is detachably connected with the dovetail groove sliding table. The first pressing plate is arranged with a first notch on the side close to the second pressing plate; the second pressing plate is arranged with a second notch on the side close to the first pressing plate; a to-be-measured member is arranged between the first and second pressing plates; one end of the to-be-measured member is embedded in the first notch; the other end of the to-be-measured member is embedded in the second notch.

2. The test fixture of claim 1, wherein, The first and second notches are both V-shaped notches; the first pressing plate is arranged with a plurality of first notches; the opening width of each first notch is different; the second pressing plate is arranged with a plurality of second notches; the opening width of each second notch is different.

3. The test fixture of claim 1, wherein, The measurement device includes a force value sensor and a connecting assembly; the connecting assembly is arranged between the force value sensor and the first pressing plate; the force value sensor is detachably connected with the connecting assembly on the side close to the connecting assembly; the connecting assembly is detachably connected with the first pressing plate on the side close to the first pressing plate.

4. The test fixture of claim 3, wherein, The connecting assembly includes a connecting vertical rod and a connecting horizontal rod; The connecting vertical rod is arranged between the force value sensor and the connecting horizontal rod; the vertical axis of the connecting vertical rod is on the same line as the vertical axis of the force value sensor; the connecting horizontal rod is perpendicular to the connecting vertical rod; the connecting vertical rod is arranged at the center position of the connecting horizontal rod, and the connecting vertical rod is fixedly connected with the connecting horizontal rod.

5. The test fixture of claim 4, wherein, The force value sensor is arranged with an internally threaded hole on the side close to the connecting vertical rod; the connecting vertical rod is arranged with an externally threaded hole on the side close to the force value sensor; the externally threaded hole includes a first connecting thread and a second connecting thread; the first connecting thread is fixedly connected with the second connecting thread; the first connecting thread is arranged between the force value sensor and the second connecting thread; the shape of the internally threaded hole matches the shape of the first connecting thread; the first connecting thread is threadedly connected with the internally threaded hole; the second connecting thread is sleeved with a nut on the outside; the second connecting thread is threadedly connected with the nut.

6. The test fixture of claim 4, wherein, The connecting horizontal rod is arranged between the connecting vertical rod and the first pressing plate; the connecting horizontal rod is arranged with a first threaded hole and a second threaded hole on the side close to the first pressing plate; one end of the first threaded hole penetrates through the connecting horizontal rod; the other end of the second threaded hole penetrates through the connecting horizontal rod; The first pressing plate is provided with a first countersunk hole and a second countersunk hole on one side close to the connecting cross bar; the first countersunk hole is bolted with the first threaded hole through a first bolt; the second countersunk hole is bolted with the second threaded hole through a second bolt.

7. The test fixture of claim 1, wherein, The side of the first pressing plate comprises a first side and a plurality of first remaining sides; the first side of the first pressing plate is provided with a first scale; the length value of the first side is greater than or equal to the length value of each of the first remaining sides; The side of the second pressing plate comprises a second side and a plurality of second remaining sides; the second side of the second pressing plate is provided with a second scale; the length value of the second side is greater than or equal to the length value of each of the second remaining sides.

8. The test fixture of claim 6, wherein, The dovetail slot sliding table is bolted with the second pressing plate through at least one third bolt; the second pressing plate is provided with a third countersunk hole matching the third bolt on one side close to the dovetail slot sliding table.

9. The test fixture of claim 7, wherein, The second pressing plate is provided with a limiting block on one side close to the first pressing plate; the shape of the limiting block matches the shape of the second pressing plate; the limiting block is slidingly connected with the second pressing plate.

10. A bend performance testing system characterized by, The test tool comprises a tensile testing machine and any one of claims 1-9; The tensile testing machine comprises a base, a frame and a tensile beam; the base is perpendicular to the frame; the top of the base is fixedly connected with the bottom of the frame; the side of the frame away from the base is slidingly connected with the tensile beam; the tensile beam is parallel to the base; the test tool is arranged on the side of the tensile beam away from the frame; the test tool is detachably connected with the bottom of the tensile beam; the test tool is parallel to the frame.

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