Lossless tension testing device

Abstract

The utility model discloses a nondestructive tension testing device, and relates to the technical field of tension testing. The nondestructive tension testing device comprises a tension detection unit, wherein the tension detection unit comprises a bracket, and a mold assembly, a driving assembly and a detection assembly which are mounted on the bracket; the mold assembly comprises a stretching mold, and the stretching mold is suitable for bearing a to-be-detected object and allowing the to-be-detected object to be arranged on the outer side of the stretching mold in a sleeving mode; the driving assembly is used for driving the stretching die to move relative to the bracket, so that the to-be-detected object is subjected to equal-proportion stretching deformation; the detection assembly is used for collecting mechanical property parameters of the to-be-detected object in the tensile deformation process. The lossless tension testing device disclosed by the utility model can realize lossless tension testing of the to-be-detected object.

Description

Technical Field

[0001] This application relates to the field of tensile testing technology, specifically to a non-destructive tensile testing device. Background Technology

[0002] After plastic parts are manufactured, they typically undergo tensile testing to determine if their quality and performance meet standards. In related technologies, tensile testing machines are generally used to perform these tests. The clamps in the tensile testing machine hook onto both ends of the sample, apply tensile force, and then accurately measure the force and deformation of the sample.

[0003] However, the tensile testing method described above can cause excessive localized stress on the specimen, which usually results in partial damage or destruction of the specimen after the test. This can have a certain impact on the subsequent use of the sample, especially for some samples with high value or special significance, which may cause significant losses. Utility Model Content

[0004] In view of this, this application provides a non-destructive tensile testing device, which can realize non-destructive tensile testing of the object to be tested. The specific technical solution adopted in this application is as follows:

[0005] This application provides a non-destructive tensile testing device, the device including a tensile testing unit, the tensile testing unit including a bracket, and a mold assembly, a drive assembly and a testing assembly mounted on the bracket;

[0006] The mold assembly includes a stretching mold adapted to carry the object to be tested and allow the object to be tested to be fitted over the outside of the stretching mold;

[0007] The driving component is used to drive the stretching die to move relative to the support, so that the object to be tested is stretched and deformed proportionally.

[0008] The detection component is used to collect the mechanical property parameters of the object under test during the tensile deformation process.

[0009] Optionally, the stretching die includes at least three sub-dies distributed circumferentially along the virtual central axis, the at least three sub-dies being driven by the drive assembly to move simultaneously toward or away from the virtual central axis;

[0010] During the movement of the at least three sub-molds, the central angle between any two sub-molds remains unchanged.

[0011] Optionally, each of the sub-molds has a first position closest to the virtual central axis and a second position furthest from the virtual central axis on its motion trajectory;

[0012] As any of the sub-molds moves from the first position to the second position, the distance between the sub-mold and other sub-molds gradually increases.

[0013] Optionally, each of the sub-molds includes a sector-shaped column having a curved side surface, the sector-shaped column contacting the object to be tested through the curved side surface and stretching the object to be tested;

[0014] The curved sides of the fan-shaped pillars of the at least three sub-molds are all located on the same virtual cylindrical surface, and the axis of the virtual cylindrical surface coincides with the virtual central axis.

[0015] Optionally, the mold assembly includes a rotary disk, which is movably connected to the at least three sub-molds and is drive-connected to the drive assembly;

[0016] The drive assembly drives the rotary disk to rotate around the virtual central axis, thereby causing the at least three sub-molds to move simultaneously.

[0017] Optionally, at least three first sliding grooves are provided on one side of the rotating disk, and the at least three sub-molds are slidably disposed in the at least three first sliding grooves in a corresponding manner;

[0018] The circumferential side of the rotating disk has gear teeth, which mesh with the drive assembly for transmission; or a gear shaft is connected to another disk surface of the rotating disk, which meshes with the drive assembly for transmission.

[0019] Optionally, the centerline of the first groove is spiral-shaped.

[0020] Optionally, each of the sub-molds further includes a tray and a slide bar;

[0021] The tray is connected to the fan-shaped column near the rotating disk, and the area of ​​the tray is larger than the area of ​​the fan-shaped column.

[0022] The slide bar is connected to the side of the support plate away from the sector column and is slidably limited to the corresponding first slide groove.

[0023] Optionally, the mold assembly further includes at least one of a first annular limiting plate and a second annular limiting plate;

[0024] The first annular limiting plate is located between the rotating disk and the tray, and at least three first limiting grooves are provided on the disk surface of the first annular limiting plate away from the rotating disk. One side of the at least three first limiting grooves extends to the inner ring surface of the first annular limiting plate, and the trays of the at least three sub-molds are located in the at least three first limiting grooves in a corresponding manner.

[0025] The second annular limiting plate is placed on the tray, and at least three second limiting grooves are provided on the inner ring wall of the second annular limiting plate. The at least three second limiting grooves are respectively facing the fan-shaped column openings of the at least three sub-molds.

[0026] The first limiting groove and the second limiting groove both extend along the centerline of the fan-shaped column of the corresponding sub-mold to restrict the movement direction of the corresponding sub-mold.

[0027] Optionally, the at least three second limiting grooves are spaced apart on the inner ring wall of the second annular limiting disk, so that the disk body between two adjacent second limiting grooves forms a partition, the partition being used to carry the object to be tested.

[0028] Optionally, each of the sub-molds is provided with an avoidance notch, through which the sub-mold avoids the corresponding partition during movement.

[0029] Optionally, the bracket is provided with a mounting hole, the gear shaft is fitted with a bearing, and the stretching die is mounted in the mounting hole through the bearing, so that the rotating disk and the stretching die are located on one side of the mounting hole, and the first gear on the gear shaft is located on the other side of the mounting hole.

[0030] Optionally, the drive assembly includes a rotary motor, on the output shaft of which a second gear is fixed, the second gear meshing directly with the first gear, or meshing with the first gear through a meshing transmission component.

[0031] Optionally, the meshing transmission component includes two racks arranged along the length direction, the two racks meshing with the first gear and the second gear respectively;

[0032] The detection component includes a force detection element located between the two racks, the force detection element being pressure-fitted with each of the two racks, or the force detection element being fixed to one of the racks and pressure-fitted with the other rack.

[0033] Optionally, the bracket is provided with a second slide groove, and at least a portion of the meshing transmission member is slidably disposed in the second slide groove.

[0034] Optionally, the tensile testing unit further includes two limiting adjustment members mounted on the bracket, the two limiting adjustment members being located on both sides of the meshing transmission member to limit the sliding distance of the meshing transmission member.

[0035] Optionally, the device further includes a testing platform, a material conveying unit, a fixture unit, and a vision inspection unit;

[0036] The tensile testing unit, the material conveying unit, the fixture unit, and the vision inspection unit are all mounted on the testing platform;

[0037] The material conveying unit is used to convey the object to be tested to the tensile testing unit, and / or to recover the object to be tested after it has been tested by the tensile testing unit;

[0038] The clamping unit is used to clamp the object to be tested from the material conveying unit and place the object to be tested so that it is fitted onto the outside of the stretching die;

[0039] The visual inspection unit is used to collect the appearance performance parameters of the object under inspection during the stretching and deformation process.

[0040] The non-destructive tensile testing device provided in this application embodiment includes a tensile testing unit. The tensile testing unit mainly achieves tensile testing through a mold assembly, a drive assembly, and a detection assembly mounted on a bracket. During tensile testing, the object to be tested is placed on the outside of the tensile mold within the mold assembly. The drive assembly then drives the tensile mold to move, applying a force to the object, thereby forcing it to deform proportionally. Simultaneously, the detection assembly collects the mechanical performance parameters of the object during this process. Since the object to be tested in this embodiment is stretched proportionally, the stress on each part is relatively uniform. Therefore, compared to the localized tensile testing method using a tensile testing machine in related technologies, the object is less prone to damage. Thus, the solution in this application embodiment can achieve non-destructive tensile testing of the object. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of the structure of a non-destructive tensile testing device provided in an embodiment of this application;

[0043] Figure 2 This is a schematic diagram of the first structure of a tensile testing unit provided in an embodiment of this application;

[0044] Figure 3 This is a schematic diagram of the structure of a mold assembly provided in an embodiment of this application;

[0045] Figure 4This is a schematic diagram of the second structure of a tensile testing unit provided in an embodiment of this application;

[0046] Figure 5 This is a schematic diagram of the disk surface structure of a rotating disk provided in an embodiment of this application;

[0047] Figure 6 This is a partial cross-sectional structural diagram of a tensile testing unit provided in an embodiment of this application;

[0048] Figure 7 This is a schematic diagram of the transmission structure between the drive component and the mold assembly in the tensile testing unit provided in the embodiments of this application;

[0049] Figure 8 This is a schematic diagram of the structure of a bracket provided in an embodiment of this application;

[0050] Figure 9 This is a schematic diagram of the third structure of a tensile testing unit provided in an embodiment of this application;

[0051] Figure 10 This is a cross-sectional structural schematic diagram of a tensile testing unit provided in an embodiment of this application;

[0052] Figure 11 This is a schematic diagram of the appearance of a non-destructive tensile testing device provided in an embodiment of this application.

[0053] Figure label:

[0054] 0. The object to be tested;

[0055] 1. Tensile testing unit;

[0056] 11. Bracket; 111. Mounting hole; 112. Second slide groove; 12. Mold assembly; 121. Stretching die; 1211. Sub-mold; 12111. Sector column; 121111. Curved side surface; 12112. Support plate; 12113. Slide rod; 12114. Clearance notch; 122. Rotary disk; 1221. First slide groove; 123. Gear shaft; 1231. First gear; 124. First annular limiting disk; 1241. First limiting groove; 125. Second annular limiting disk; 1251. Second limiting groove; 1252. Separator; 126. Bearing; 13. Drive assembly; 131. Rotary motor; 1311. Second gear; 132. Meshing transmission component; 1321. Rack; 14. Detection assembly; 141. Force detection component; 15. Limit adjustment component;

[0057] 2. Testing station;

[0058] 3. Material conveying unit;

[0059] 4. Fixture unit;

[0060] 5. Visual inspection unit;

[0061] 6. Box shell. Detailed Implementation

[0062] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0063] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0064] This application provides a non-destructive tensile testing device for performing tensile tests on an object 0 to be tested. The object 0 to be tested is typically a material with a certain degree of elasticity, such as a plastic part or a rubber part. Figure 1 and Figure 2 As shown, this device includes a tensile testing unit 1, which includes a support 11, and a mold assembly 12, a drive assembly 13, and a die assembly 12 mounted on the support 11. Figure 7 The detection component 14 is shown; the mold component 12 includes a stretching mold 121, which is adapted to carry the object to be tested 0 and allows the object to be tested 0 to be fitted on the outside of the stretching mold 121; the drive component 13 is used to drive the stretching mold 121 to move relative to the support 11 so that the object to be tested 0 is stretched and deformed proportionally; the detection component 14 is used to collect the mechanical performance parameters of the object to be tested 0 during the stretching deformation process.

[0065] It should be understood that, in the embodiments of this application, "proportional stretching deformation" means that during the process of the test object 0 being stretched and deformed, each part of the test object 0 is stretched in the same proportion, that is, the proportion of increase in its length, width, height and other dimensional parameters is uniform.

[0066] The non-destructive tensile testing device provided in this application embodiment allows the test object 0 to be placed on the outside of the stretching mold 121 in the mold assembly 12 during tensile testing. Then, the driving assembly 13 drives the stretching mold 121 to move, applying a force to the test object 0, thereby forcing it to deform proportionally. Simultaneously, the detection assembly 14 collects the mechanical performance parameters of the test object 0 during this process. Since the test object 0 in this embodiment is stretched proportionally, the stress on each part is relatively uniform. Therefore, compared to the localized tensile testing method using a tensile testing machine in related technologies, the test object 0 is less prone to damage. Thus, the solution in this application embodiment can achieve non-destructive tensile testing of the test object.

[0067] In some embodiments of this application, such as Figure 3 As shown, the stretching die 121 includes at least three sub-dies 1211 circumferentially distributed along a virtual central axis. The at least three sub-dies 1211 can be driven by the drive assembly 13 to move simultaneously toward or away from the virtual central axis. During the movement of the at least three sub-dies 1211, the central angle between any two sub-dies 1211 remains unchanged.

[0068] The non-destructive tensile testing device provided in this application is applicable to test objects 0 that are annular in shape, such as circular rings, square rings, polygonal rings, etc. During tensile testing, the test object 0 is placed on the outside of the tensile mold 121, that is, on the outside of at least three sub-molds 1211. Since the at least three sub-molds 1211 are distributed circumferentially along a virtual central axis, when the at least three sub-molds 1211 are driven to move, they will apply forces to different parts of the test object 0 in the circumferential direction, causing each part of the test object 0 to undergo tensile deformation. Furthermore, since the at least three sub-molds 1211 move simultaneously, and the central angle between any two sub-molds 1211 remains unchanged during the movement, each part of the test object 0 is stretched simultaneously and equally, so the test object 0 as a whole can exhibit proportional tensile deformation.

[0069] Generally, during the tensile deformation of the object to be tested (0), it is necessary to ensure that the central axis of the object to be tested (0) and the virtual central axis always coincide, so as to ensure that the object to be tested (0) can deform proportionally. Therefore, in this embodiment, the circumferential outer contour shape of the stretching die 121 should be adapted to the inner ring shape of the object to be tested (0) in its natural state. For example, when the inner ring shape of the object to be tested (0) is circular, the circumferential outer contour shape of the stretching die 121 should also be circular; when the inner ring shape of the object to be tested (0) is square, the circumferential outer contour shape of the stretching die 121 should also be square. Here, the natural state refers to the state without external force.

[0070] Furthermore, in this embodiment, the movement trajectories of at least three sub-molds 1211 have the same shape, so as to ensure that the central angle between any two sub-molds 1211 remains unchanged during their movement.

[0071] like Figure 4 As shown, optionally, at least three sub-molds 1211 are evenly distributed circumferentially along the virtual central axis. For example, when there are three sub-molds 1211, the central angle between two adjacent sub-molds 1211 is 120°; when there are four sub-molds 1211, the central angle between two adjacent sub-molds 1211 is 90°.

[0072] In this embodiment, since each sub-mold 1211 moves along a direction close to or far from the virtual central axis, each sub-mold 1211 has a first position closest to the virtual central axis and a second position farthest from the virtual central axis on its movement trajectory. Figure 4 At least three sub-molds 1211 in the two mold assemblies 12 shown are in the first position and the second position, respectively. For example... Figure 4 As shown in the mold assembly 12 on the right, when at least three sub-molds 1211 are all in the first position, the radial dimension of the stretching mold 121 is minimal and is typically less than or equal to the inner diameter of the object to be tested 0 in its natural state, allowing the object to be tested 0 to be easily fitted onto the stretching mold 121. As the at least three sets of molds move from the first position to the second position, the radial dimension of the stretching mold 121 gradually increases, exceeding the inner diameter of the object to be tested 0 in its natural state, thus gradually stretching the object to be tested 0. Figure 4 As shown in the mold assembly 12 on the left, when at least three sub-molds 1211 are in the second position, the radial dimension of the stretching mold 121 reaches its maximum and is usually larger than the inner diameter of the object to be tested 0 in its natural state. At this time, there will be an interaction force between the object to be tested 0 (without breakage) and the stretching mold 121.

[0073] As each sub-mold 1211 moves between the first position and the second position, the distance between each sub-mold 1211 also changes. Specifically, when all sub-molds 1211 are in the first position, the distance between them is the smallest; for example, adjacent sub-molds 1211 can touch each other or there is only a small gap between them. As they move from the first position to the second position, the distance between any sub-mold 1211 and the other sub-molds 1211 gradually increases. When all sub-molds 1211 are in the second position, the distance between them is the largest, and there is a large gap between adjacent sub-molds 1211.

[0074] In some embodiments of this application, see also [link to previous document]. Figure 3 When the inner ring shape of the object to be tested 0 is circular, each sub-mold 1211 includes a sector-shaped column 12111. The sector-shaped column 12111 has two fan-shaped surfaces and three side surfaces connecting the two fan-shaped surfaces. These three side surfaces include one curved side surface 121111 and two flat side surfaces. The sector-shaped column 12111 contacts the object to be tested 0 through the curved side surface 121111 and applies force to the object to be tested 0 to cause it to stretch and deform; the sector-shaped column 12111 cooperates with the flat side surfaces of the sector-shaped columns 12111 of the two adjacent sub-molds 1211 through the two flat side surfaces.

[0075] The curved side surfaces 121111 of the fan-shaped pillars 12111 of at least three sub-molds 1211 are all located on the same virtual cylindrical surface, and the axis of the virtual cylindrical surface coincides with the virtual central axis. In this way, it can be ensured that the forces exerted by the curved side surfaces 121111 of at least three sub-molds 1211 on the object to be tested are radially along the object to be tested and are equal in magnitude. Therefore, it is ensured that all parts of the object to be tested are subjected to force simultaneously and uniformly, and the object to be tested can achieve proportional tensile deformation.

[0076] In some embodiments of this application, the number of drive components 13 can be at least three, which are connected to at least three sub-molds 1211 in a one-to-one transmission connection to achieve synchronous movement. However, in this scheme, the power sources of at least three sub-molds 1211 are independent of each other. If simultaneous driving and the same amount of movement are to be achieved, the control precision and drive reliability requirements of the drive components 13 are relatively high. Furthermore, increasing the number of drive components 13 will also lead to increased costs and larger space occupation.

[0077] Therefore, in other embodiments of this application, such as Figure 3 As shown, at least three sub-molds 1211 can be driven by the same drive assembly 13. Mold assembly 12 includes a rotary disk 122, which is movably connected to at least three sub-molds 1211 and is drive-connected to drive assembly 13; drive assembly 13 drives the rotary disk 122 to rotate around a virtual central axis, thereby actuating at least three sub-molds 1211 to move simultaneously.

[0078] The rotary disk 122 connects to at least three sub-molds 1211 at the same time, which means that at least three sub-molds 1211 share the same power source. This improves the reliability of simultaneous driving, reduces the requirements for the drive components 13, saves equipment costs, and reduces the space occupied.

[0079] Since the tensile deformation of the object 0 under test is usually small during tensile testing, but high precision is required, precise transmission is necessary between the drive assembly 13 and the rotating disk 122, for example, through gear meshing. In one example, the circumferential side of the rotating disk 122 may be provided with gear teeth (not shown in the figure), and the rotating disk 122 meshes with the drive assembly 13 through these gear teeth. In another example, a gear shaft 123 may be connected to the disk surface of the rotating disk 122 away from the tensile die 121, and the gear shaft 123 meshes with the drive assembly 13 for transmission.

[0080] Compared to other transmission methods, gear meshing transmission has advantages such as high transmission accuracy, good transmission reliability, and smooth transmission.

[0081] In some embodiments of this application, such as Figure 3 As shown, at least three sub-molds 1211 and the rotating disk 122 can be slidably connected. For example, at least three first grooves 1221 can be provided on the surface of the rotating disk 122 near the stretching die 121, and the at least three sub-molds 1211 are slidably disposed in the at least three first grooves 1221 in a corresponding manner. When the rotating disk 122 rotates, the at least three sub-molds 1211 slide simultaneously in the corresponding first grooves 1221, thereby having the same amount of sliding relative to the rotating disk 122.

[0082] Compared to driving each sub-mold 1211 to move directly along the radial direction of the rotating disk 122, driving each sub-mold 1211 to tilt relative to the radial direction by rotating the rotating disk 122 can save space on the disk surface and make it easier to control the accuracy of the movement distance.

[0083] Optionally, such as Figure 5 As shown, the centerline of the first groove 1221 is spiral-shaped, meaning that the movement trajectory of each sub-mold 1211 is also spiral-shaped. This allows the sliding of each sub-mold 1211 relative to the rotating disk 122 to be smoother.

[0084] In some embodiments of this application, see Figure 3 Each sub-mold 1211 also includes a support plate 12112 and a slide bar 12113; the support plate 12112 is connected to the fan-shaped column 12111 near the rotating disk 122, and the plate area of ​​the support plate 12112 is larger than the plate area of ​​the fan-shaped column; the slide bar 12113 is connected to the side of the support plate 12112 away from the fan-shaped column 12111 and is slidably limited to the corresponding first slide groove 1221.

[0085] "Sliding limit" means that two relatively sliding parts can only slide along a set trajectory. For example, for slide bar 12113 and first slide groove 1221, slide bar 12113 can only slide along the extension direction of the center line of the slide groove. Therefore, it ensures that each sub-mold 1211 moves simultaneously and equally relative to the virtual central axis, thereby ensuring that the object to be tested 0 will be stretched proportionally.

[0086] like Figure 3 As shown, the mold assembly 12 may further include a first annular limiting disk 124 located between the rotating disk 122 and the support plate 12112. At least three first limiting grooves 1241 are provided on the surface of the first annular limiting disk 124 away from the rotating disk 122. One side of each of the at least three first limiting grooves 1241 extends to the inner annular surface of the first annular limiting disk 124. The support plates 12112 of at least three sub-molds 1211 are correspondingly located within the at least three first limiting grooves 1241. The length direction of the first limiting groove 1241 extends along the centerline direction of the fan-shaped column 12111 of the corresponding sub-mold 1211, thereby restricting the movement direction of the sub-mold 1211 to be parallel to the centerline direction of the fan-shaped column 12111.

[0087] See also Figure 3 The mold assembly 12 may further include a second annular limiting plate 125 placed on the pallet 12112. The inner annular wall of the second annular limiting plate 125 is provided with at least three second limiting grooves 1251, each opening one-to-one toward the fan-shaped pillars 12111 of at least three sub-molds 1211. The depth direction of each second limiting groove 1251 is parallel to the centerline direction of the fan-shaped pillar 12111 of the corresponding sub-mold 1211, thus restricting each sub-mold 1211 to reciprocate along the depth direction of the corresponding second limiting groove 1251.

[0088] By setting the first limiting groove 1241 and the second limiting groove 1251, at least three sub-molds 1211 can move in specified directions respectively, thus constraining the movement direction of at least three sub-molds 1211. Since the centerline direction of the fan-shaped column 12111 of each sub-mold 1211 is generally parallel to the radial direction of the object to be tested 0, the at least three sub-molds 1211, whose movement direction is constrained as above, also move simultaneously along the radial direction of the object to be tested 0. Therefore, it is possible to ensure uniform force applied to each part of the object to be tested 0, thereby ensuring proportional deformation of the object to be tested 0.

[0089] Optionally, such as Figure 3 As shown, at least three second limiting grooves 1251 are spaced apart on the inner ring wall, thereby forming a partition 1252 on the disc between two adjacent limiting grooves. The partition 1252 is used to carry the object to be tested 0.

[0090] At least three second limiting grooves 1251 can form at least three partitions 1252 in the circumferential direction. The at least three partitions 1252 are equally spaced, so that after the object to be tested 0 is fitted on the outside of the stretching die 121, the object to be tested 0 will contact the at least three partitions 1252 in the direction of gravity and be supported by the at least three partitions 1252.

[0091] If at least three sub-molds 1211 are in the first position, and two adjacent sub-molds 1211 are in contact with each other, then the presence of the partition 1252 may hinder the radial movement of the sub-molds 1211. Therefore, an avoidance notch 12114 can be provided on each sub-mold 1211, through which the sub-mold 1211 avoids the corresponding partition 1252 during movement.

[0092] In this embodiment, since the rotating disk 122 is driven by rotation, it is necessary for the rotating disk 122 to rotate relative to the support 11. For example... Figure 6 As shown, the bracket 11 has a mounting hole 111, and a bearing 126 is fitted onto the gear shaft 123. The stretching die 121 is mounted in the mounting hole 111 via the bearing 126, so that the gear shaft 123 can drive the rotating disk 122 to rotate relative to the bracket 11. The rotating disk 122 and the stretching die 121 are located on one side of the mounting hole 111, and the first gear 1231 on the gear shaft 123 is located on the other side of the mounting hole 111.

[0093] In some embodiments, the drive assembly 13 may include a rotary motor 131, on the output shaft of which a second gear 1311 is fixed. The second gear 1311 directly meshes with the first gear 1231, or meshes with the first gear 1231 through a meshing transmission member 132. Thus, the rotary motor 131 can drive the gear shaft 123 to rotate the rotary disk 122, thereby causing at least three sub-molds 1211 to move.

[0094] Optionally, the meshing transmission component 132 includes two racks 1321 arranged along their length and meshing with a first gear 1231 and a second gear 1311, respectively. The detection component 14 includes a force detection component 141 located between the two racks 1321. The force detection component 141 is in pressure engagement with both racks 1321, or the force detection component 141 is fixed to one of the racks 1321 and in pressure engagement with the other rack 1321.

[0095] When the output shaft of the rotary motor 131 rotates, the second gear 1311 rotates and transmits the driving force to the rack 1321 meshing with it. Then, the transmission force on the rack 1321 is transmitted to another rack 1321 via the force detection element 141. Thus, the two racks 1321 and the force detection element 141 move together along the length of the rack 1321. While the other rack 1321 moves, it drives the first gear 1231 to rotate, and the rotating disk 122 connected to the gear shaft 123 of the first gear 1231 also rotates synchronously, so that each first slide groove 1221 and the slide rod 12113 of the corresponding sub-mold 1211 produce relative sliding. Since the first chute 1221 is spiral-shaped, with one end close to the center of the rotating disk 122 and the other end far away from the center of the rotating disk 122, each sub-mold 1211 with slide bar 12113 will move towards or away from the virtual central axis, thereby proportionally stretching the object to be tested 0, or proportionally shrinking the deformed object to be tested 0.

[0096] During this process, the force detection element 141 can collect the pressure transmitted by the rack 1321 that is in contact with it in real time. In this embodiment, the working process of the device is as follows: the rotary motor 131 drives the rack 1321 to move, thereby driving the first gear 1231 to rotate, which in turn drives at least three sub-molds 1211 to move, causing the test object 0, which is sleeved on the outside of the at least three sub-molds 1211, to undergo tensile deformation. Therefore, when performing a tensile test, the amount of deformation (diameter change) of the test object 0 under the required tensile force value can be determined according to the material of the test object 0 and the required tensile force value. This amount of deformation is the distance that the at least three sub-molds 1211 need to move. Then, based on the distance that at least three sub-molds 1211 need to move, the angle that the rotary disk 122 needs to rotate is determined. Then, based on the transmission ratio of the first gear 1231 to the rack 1321 and the transmission ratio of the second gear 1311 to the rack 1321, the angle that the second gear 1311 of the rotary motor 131 needs to rotate is calculated. Finally, the driving force that the rotary motor 131 needs to output is calculated accordingly.

[0097] Generally, the pressure collected by the force detection element 141 should correspond to the driving force output by the rotary motor 131. If the force detection element 141 detects an abnormal pressure at a certain moment during the tensile test, such as being less than the driving force output by the rotary motor 131, it may be because the object under test 0 has been damaged or broken, thus determining that the tensile test of the object under test 0 is unqualified. If the pressure detected by the force detection element 141 remains normal throughout the tensile test and corresponds to the driving force output by the rotary motor 131, then it can be determined that the tensile test of the object under test 0 is qualified.

[0098] Optionally, the force detection element 141 is a force sensor. For example, it can be an S-type sensor.

[0099] In some embodiments of this application, such as Figure 8 As shown, a second slide groove 112 may be provided on the bracket 11, and at least a portion of the meshing transmission member 132 is slidably disposed in the second slide groove 112. The meshing transmission member 132 is slidably mounted on the bracket 11 to ensure smooth movement between the first gear 1231 and the second gear 1311, thereby ensuring the detection accuracy of the force detection member 141.

[0100] In some embodiments of this application, such as Figure 9 and Figure 10 As shown, the tensile testing unit 1 also includes two limiting adjustment members 15 mounted on the bracket 11. The two limiting adjustment members 15 are located on both sides of the meshing transmission member 132 to limit the sliding distance of the meshing transmission member 132.

[0101] For example, the limiting adjustment member 15 may include a screw and a nut, with the screw passing through a through hole on the bracket 11 and threadedly engaging with the nut for fixation. During transmission, the rack 1321 moves to a position abutting against the screw, thereby restricting its movement and preventing the rack 1321 from disengaging from the first gear 1231 or the second gear 1311.

[0102] In some embodiments of this application, such as Figure 1 As shown, the device may also include a testing platform 2, a material conveying unit 3, a clamping unit 4, and a vision inspection unit 5; the tensile testing unit 1, the material conveying unit 3, the clamping unit 4, and the vision inspection unit 5 are all mounted on the testing platform 2; the material conveying unit 3 is used to convey the object to be tested 0 to the tensile testing unit 1, and / or to retrieve the object to be tested 0 that has been tested by the tensile testing unit 1; the clamping unit 4 is used to clamp the object to be tested 0 from the material conveying unit 3 and place the object to be tested 0 so that it is fitted onto the outside of the tensile mold 121; the vision inspection unit 5 is used to collect the appearance performance parameters of the object to be tested 0 during the tensile deformation process.

[0103] like Figure 1As shown, the material conveying unit 3 includes a vibratory feeder and a conveying channel. Several objects to be tested 0 are placed on the vibratory feeder and conveyed through the conveying channel to ensure automatic feeding and neat conveying. The clamping unit 4 includes a robotic arm that can clamp the objects to be tested 0 conveyed to a designated position through the conveying channel and place them onto the tensile mold 121, so that the objects to be tested 0 are fitted onto the outside of the tensile mold 121 for tensile testing. The visual inspection unit 5 includes a CCD (charge coupled device) camera, which is arranged above the tensile mold 121. During the tensile test of the objects to be tested 0, it can detect the appearance deformation of the objects to be tested 0, thereby determining whether there are quality defects.

[0104] In some embodiments of this application, such as Figure 11 As shown, the device also includes a housing 6, which is mounted on the testing platform 2 and forms a closed cavity with the platform surface of the testing platform 2. The tensile testing unit 1, the material conveying unit 3, the clamping unit 4, and the vision inspection unit 5 are all housed within this cavity. This design effectively avoids the influence of external environmental factors such as strong airflow (e.g., wind), precipitation, and dust on the tensile test, improving testing accuracy and extending the service life of the non-destructive tensile testing device.

[0105] The housing 6 can be a one-piece molded structure that is detachably connected to the testing table 2; or, the housing 6 can be equipped with an operating door that can be opened or closed.

[0106] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0107] The above description is only for the purpose of enabling those skilled in the art to understand the technical solution of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A non-destructive tension testing device, characterized by, The device comprises a stretch detection unit (1), which comprises a support (11), a mold assembly (12), a driving assembly (13) and a detection assembly (14) mounted on the support (11); The mold assembly (12) comprises a stretch mold (121), which is adapted to carry an object to be detected (0) and allows the object to be detected (0) to be sleeved on the outside of the stretch mold (121); The driving assembly (13) is used to drive the stretch mold (121) to move relative to the support (11), so that the object to be detected (0) is stretched and deformed at a constant ratio; The detection assembly (14) is used to collect the mechanical property parameters of the object to be detected (0) during the stretching and deformation process.

2. The proof stress testing apparatus of claim 1, wherein, The stretch mold (121) comprises at least three sub-molds (1211) distributed circumferentially along a virtual central axis, which can be driven by the driving assembly (13) to move simultaneously towards or away from the virtual central axis; Wherein, the central angle between any two sub-molds (1211) remains unchanged during the movement of the at least three sub-molds (1211).

3. The device of claim 2, wherein, Each sub-mold (1211) has a first position closest to the virtual central axis and a second position farthest from the virtual central axis on its movement trajectory; When any sub-mold (1211) moves from the first position to the second position, the distance between the sub-mold (1211) and other sub-molds (1211) gradually increases.

4. The non-destructive proof stress testing device of claim 2 or 3, wherein, Each sub-mold (1211) comprises a sector column (12111) having a curved side surface (121111), which contacts the object to be detected (0) and stretches the object to be detected (0) through the curved side surface (121111); Wherein, the curved side surfaces (121111) of the sector columns (12111) of the at least three sub-molds (1211) are located on the same virtual cylindrical surface, and the axis of the virtual cylindrical surface coincides with the virtual central axis.

5. The device of claim 4, wherein, The mold assembly (12) comprises a rotating disc (122), which is movably connected with the at least three sub-molds (1211) and drivingly connected with the driving assembly (13); The driving assembly (13) drives the rotating disc (122) to rotate around the virtual central axis, thereby actuating the at least three sub-molds (1211) to move simultaneously.

6. The device of claim 5, wherein, At least three first sliding grooves (1221) are provided on one disc surface of the rotating disc (122), and the at least three sub-molds (1211) are correspondingly and slidably arranged in the at least three first sliding grooves (1221). The circumferential side of the rotating disc (122) has gear teeth which are in meshing transmission with the driving assembly (13); or a gear shaft (123) is connected to the other disc surface of the rotating disc (122), and the gear shaft (123) is in meshing transmission with the driving assembly (13).

7. The device of claim 6, wherein, The center line of the first sliding groove (1221) is in the shape of a spiral line.

8. The non-destructive proof stress testing device of claim 6 or 7, wherein, Each of the sub-molds (1211) further comprises a supporting plate (12112) and a sliding rod (12113); The supporting plate (12112) is connected to the sector surface of the sector column (12111) close to the rotating disc (122), and the plate area of the supporting plate (12112) is greater than that of the sector surface; The sliding rod (12113) is connected to the side of the supporting plate (12112) away from the sector column (12111) and is slidingly limited in the corresponding first sliding groove (1221).

9. The device of claim 8, wherein, The mold assembly (12) further comprises at least one of a first annular limiting disc (124) and a second annular limiting disc (125); The first annular limiting disc (124) is located between the rotating disc (122) and the supporting plate (12112), and at least three first limiting grooves (1241) are arranged on the disc surface of the first annular limiting disc (124) away from the rotating disc (122), one side of the at least three first limiting grooves (1241) extending to the inner annular surface of the first annular limiting disc (124), and the supporting plates (12112) of the at least three sub-molds (1211) are correspondingly located in the at least three first limiting grooves (1241); The second annular limiting disc (125) is placed on the supporting plate (12112), and at least three second limiting grooves (1251) are arranged on the inner annular wall of the second annular limiting disc (125), and the at least three second limiting grooves (1251) are correspondingly opened towards the sector columns (12111) of the at least three sub-molds (1211); The first limiting grooves (1241) and the second limiting grooves (1251) both extend along the center line direction of the sector surface of the sector column (12111) of the corresponding sub-mold (1211) to limit the moving direction of the corresponding sub-mold (1211).

10. The device of claim 9, wherein, The at least three second limiting grooves (1251) are arranged at intervals on the inner annular wall of the second annular limiting disc (125), so that the disc body between the adjacent two second limiting grooves (1251) forms a separation part (1252) for carrying the object to be detected (0).

11. The device of claim 10, wherein, Each of the sub-molds (1211) is provided with a avoiding gap (12114), and the sub-mold (1211) avoids the corresponding separation part (1252) through the avoiding gap (12114) in the movement process.

12. The device of claim 6, wherein, The support (11) is provided with a mounting hole (111), the gear shaft (123) is sleeved with a bearing (126), the stretching die (121) is installed in the mounting hole (111) through the bearing (126), so that the rotating disc (122) and the stretching die (121) are located on one side of the mounting hole (111), and the first gear (1231) on the gear shaft (123) is located on the other side of the mounting hole (111).

13. The device of claim 12, wherein, The driving assembly (13) comprises a rotating motor (131), and a second gear (1311) is fixed on an output shaft of the rotating motor (131); the second gear (1311) is directly engaged with the first gear (1231), or is engaged with the first gear (1231) through an engaging transmission member (132).

14. The device of claim 13, wherein, The engaging transmission member (132) comprises two racks (1321) arranged in the length direction, and the two racks (1321) are respectively engaged with the first gear (1231) and the second gear (1311). The detection assembly (14) comprises a force detection member (141) located between the two racks (1321); the force detection member (141) is respectively pressure-fitted with the two racks (1321), or the force detection member (141) is fixed to one of the racks (1321) and is pressure-fitted with the other rack (1321).

15. The non-destructive proof stress testing device of claim 13 or 14, wherein, The support (11) is provided with a second sliding groove (112), and at least a part of the engaging transmission member (132) is slidingly arranged in the second sliding groove (112).

16. The device of claim 15, wherein, The stretching detection unit (1) further comprises two limiting adjustment members (15) installed on the support (11); the two limiting adjustment members (15) are respectively located on the two sides of the engaging transmission member (132) to limit the sliding distance of the engaging transmission member (132).

17. The proof stress testing apparatus of claim 1, wherein, The device further comprises a detection table (2), a material conveying unit (3), a clamp unit (4) and a visual detection unit (5). The stretching detection unit (1), the material conveying unit (3), the clamp unit (4) and the visual detection unit (5) are all installed on the detection table (2). The material conveying unit (3) is used for conveying the to-be-detected object (0) to the stretching detection unit (1), and / or recycling the to-be-detected object (0) after detection by the stretching detection unit (1). The clamp unit (4) is used for clamping the to-be-detected object (0) from the material conveying unit (3) and placing the to-be-detected object (0) to make it sleeved outside the stretching die (121). The visual detection unit (5) is used for collecting appearance performance parameters in the process of stretching deformation of the to-be-detected object.

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