Lossless tension testing device

Abstract

The invention 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 invention can realize lossless tension testing of the to-be-detected object.

Description

Technical Field

[0001] The present application relates to the technical field of tensile testing, and in particular to a non-destructive tensile testing device. Background Art

[0002] After plastic parts are produced, they usually need to be tensile tested to determine whether their quality and performance meet the standards. In related technologies, a tensile testing machine is generally used to perform tensile tests on plastic parts. After the clamps in the tensile testing machine hook the two ends of the sample, a tensile force is applied to the sample, and then the force and deformation of the sample are accurately measured.

[0003] However, the above-mentioned stretching method of the tensile testing machine will cause excessive local force concentration on the sample, which usually causes partial destruction or damage to the sample after the test. Therefore, it will have a certain impact on the subsequent use of the sample, especially for some samples with high value or special significance, which may cause greater losses. Summary of the invention

[0004] In view of this, the present application provides a non-destructive tensile testing device, which can realize non-destructive tensile testing of the object to be tested. The present application specifically adopts the following technical solutions:

[0005] The present application provides a non-destructive tensile testing device, the device comprising a tensile testing unit, the tensile testing unit comprising a bracket, and a mold assembly, a driving assembly and a detection assembly mounted on the bracket;

[0006] The mold assembly includes a stretching mold, and the stretching mold is suitable for carrying the object to be detected and allowing the object to be detected to be sleeved on the outside of the stretching mold;

[0007] The driving assembly is used to drive the stretching die to move relative to the bracket, so that the object to be detected is stretched and deformed in equal proportion;

[0008] The detection component is used to collect mechanical performance parameters of the object to be detected during the stretching deformation process.

[0009] Optionally, the stretching die comprises at least three sub-dies distributed along the circumference of the virtual central axis, and the at least three sub-dies can be driven by the driving assembly to simultaneously move toward or away from the virtual central axis;

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

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

[0012] When 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 comprises a fan-shaped column, the fan-shaped column has a curved side surface, the fan-shaped column contacts the object to be detected through the curved side surface, and stretches the object to be detected;

[0014] The curved side surfaces of the sector-shaped columns of the at least three sub-moulds 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 rotating disk, which is movably connected to the at least three sub-molds and is transmission-connected to the driving assembly;

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

[0017] Optionally, at least three first slide grooves are arranged on a disk surface of the rotating disk, and the at least three sub-molds are slidably arranged in the at least three first slide grooves in a one-to-one correspondence;

[0018] The circumferential side surface of the rotating disk has gear teeth, and the gear teeth are meshed with the driving component for transmission; or a gear shaft is connected to the other disk surface of the rotating disk, and the gear shaft is meshed with the driving component for transmission.

[0019] Optionally, a center line of the first slide groove is in a spiral shape.

[0020] Optionally, each of the sub-molds further comprises a support plate and a slide bar;

[0021] The support plate is connected to the sector surface of the sector column close to the rotating disk, and the plate area of ​​the support plate is larger than the plate area of ​​the sector surface;

[0022] The sliding rod is connected to a side of the supporting plate away from the fan-shaped column, and is slidably limited to the corresponding first sliding groove.

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

[0024] The first annular limiting plate is located between the rotating plate and the supporting plate, and at least three first limiting grooves are arranged on the surface of the first annular limiting plate away from the rotating plate, one side of the at least three first limiting grooves extends to the inner annular surface of the first annular limiting plate, and the supporting plates of the at least three sub-molds are located in the at least three first limiting grooves one by one;

[0025] The second annular limiting plate is placed on the supporting plate, and at least three second limiting grooves are arranged on the inner ring wall of the second annular limiting plate, and the at least three second limiting grooves are opened toward the fan-shaped columns of the at least three sub-molds one by one;

[0026] Wherein, the first limiting groove and the second limiting groove both extend along the center line direction of the sector surface of the corresponding sector column of the sub-mold to limit the moving direction of the corresponding sub-mold.

[0027] Optionally, the at least three second limiting grooves are arranged at intervals 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, and the partition is used to carry the object to be detected.

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

[0029] Optionally, a mounting hole is provided on the bracket, a bearing is sleeved on the gear shaft, and the stretching die is installed 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 driving assembly includes a rotating motor, a second gear is fixed to an output shaft of the rotating motor, and the second gear is directly meshed with the first gear or meshed with the first gear through a meshing transmission member.

[0031] Optionally, the meshing transmission member comprises two racks arranged along the length direction, and the two racks are respectively meshed with the first gear and the second gear;

[0032] The detection assembly includes a force detection member located between the two racks, and the force detection member is pressure-matched with the two racks respectively, or the force detection member is fixed to one of the racks and pressure-matched with the other rack.

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

[0034] Optionally, the stretching detection unit further comprises two limit adjustment members mounted on the bracket, wherein the two limit adjustment members are respectively located on both sides of the meshing transmission member to limit the sliding distance of the meshing transmission member.

[0035] Optionally, the device further comprises a detection table, a material conveying unit, a fixture unit and a visual detection unit;

[0036] The stretch detection unit, the material conveying unit, the clamp unit and the visual detection unit are all installed on the detection table;

[0037] The material conveying unit is used to convey the object to be detected to the stretching detection unit, and / or to recover and convey the object to be detected after being detected by the stretching detection unit;

[0038] The clamp unit is used to clamp the object to be detected from the material conveying unit, and place the object to be detected so that it is sleeved on the outer side of the stretching die;

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

[0040] The nondestructive tensile testing device provided in the embodiment of the present application has a stretching detection unit, and the stretching detection unit mainly realizes the tensile test through a mold assembly, a driving assembly and a detection assembly installed on a bracket. When performing a tensile test, the object to be detected can be sleeved on the outer side of the stretching mold in the mold assembly, and then the stretching mold is driven to move by the driving assembly, so that the stretching mold applies a force to the object to be detected, thereby forcing the object to be detected to deform in proportion, and at the same time, the detection assembly collects the mechanical performance parameters of the object to be detected in this process. Among them, since the object to be detected in the embodiment of the present application is stretched in proportion, each part is relatively uniformly stressed, so compared with the stretching method of using a tensile testing machine to locally stress in the related art, the object to be detected is not easy to be destroyed or damaged, so the scheme of the embodiment of the present application can realize nondestructive tensile testing of the object to be detected. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0042] Figure 1 It is a structural schematic diagram of a non-destructive tensile testing device provided in an embodiment of the present application;

[0043] Figure 2 is a first structural schematic diagram of a stretching detection unit provided in an embodiment of the present application;

[0044] Figure 3 It is a structural schematic diagram of a mold assembly provided in an embodiment of the present application;

[0045] Figure 4is a second structural schematic diagram of a stretching detection unit provided in an embodiment of the present application;

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

[0047] Figure 6 is a schematic diagram of a partial cross-sectional structure of a stretching detection unit provided in an embodiment of the present application;

[0048] Figure 7 It is a schematic diagram of the transmission structure of the driving member and the mold assembly in the stretching detection unit provided in the embodiment of the present application;

[0049] Figure 8 It is a structural schematic diagram of a bracket provided in an embodiment of the present application;

[0050] Fig. 9 is a third structural schematic diagram of a stretching detection unit provided in an embodiment of the present application;

[0051] Fig.10 is a schematic cross-sectional structure diagram of a stretching detection unit provided in an embodiment of the present application;

[0052] Fig.11 It is a schematic diagram of the appearance of a nondestructive tensile testing device provided in an embodiment of the present application.

[0053] Reference numerals:

[0054] 0. Object to be detected;

[0055] 1. Tensile testing unit;

[0056] 11. bracket; 111. mounting hole; 112. second slide; 12. mold assembly; 121. stretching mold; 1211. sub-mold; 12111. fan-shaped column; 121111. curved side surface; 12112. support plate; 12113. slide bar; 12114. avoidance gap; 122. rotating disk; 1221. first slide; 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. partition; 126. bearing; 13. drive assembly; 131. rotating motor; 1311. second gear; 132. meshing transmission member; 1321. rack; 14. detection assembly; 141. force detection member; 15. limiting adjustment member;

[0057] 2. Testing table;

[0058] 3. Material conveying unit;

[0059] 4. Fixture unit;

[0060] 5. Visual inspection unit;

[0061] 6. Box shell. DETAILED DESCRIPTION

[0062] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

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

[0064] The embodiment of the present application provides a non-destructive tensile testing device for performing a tensile test on an object to be tested 0. The object to be tested 0 applicable to the device is usually a material with a certain elasticity, such as a plastic part, a rubber part, etc. Figure 1 and Figure 2 As shown, the device includes a stretching detection unit 1, which includes a bracket 11, a mold assembly 12 installed on the bracket 11, a driving assembly 13 and Figure 7 The detection component 14 is shown; the mold component 12 includes a stretching mold 121, which is suitable for carrying the object to be detected 0 and allowing the object to be detected 0 to be mounted on the outside of the stretching mold 121; the driving component 13 is used to drive the stretching mold 121 to move relative to the bracket 11 so that the object to be detected 0 is stretched and deformed in proportion; the detection component 14 is used to collect the mechanical performance parameters of the object to be detected 0 during the stretching deformation process.

[0065] It should be understood that in the embodiment of the present application, "proportional stretching deformation" means that in the process of the object to be detected 0 being stretched and deformed, the various parts of the object to be detected 0 are elongated in the same proportion, that is, the proportion of increase in its length, width, height and other dimensional parameters is uniform.

[0066] When the nondestructive tensile testing device provided in the embodiment of the present application performs a tensile test, the object to be tested 0 can be sleeved on the outer side of the stretching die 121 in the die assembly 12, and then the stretching die 121 is driven to move by the driving assembly 13, so that the stretching die 121 applies a force to the object to be tested 0, thereby forcing the object to be tested 0 to deform in proportion, and at the same time, the detection assembly 14 collects the mechanical performance parameters of the object to be tested 0 in this process. Among them, since the object to be tested 0 in the embodiment of the present application is stretched in proportion, each part is relatively uniformly stressed, so compared with the stretching method of using a tensile testing machine in the related art, the object to be tested 0 is not easy to be destroyed or damaged, so the scheme of the embodiment of the present application can realize nondestructive tensile testing of the object to be tested.

[0067] In some embodiments of the present application, Figure 3 As shown, the stretching die 121 includes at least three sub-dies 1211 distributed along the circumference of the virtual central axis, and the at least three sub-dies 1211 can be driven by the driving assembly 13 to move toward or away from the virtual central axis at the same time. In the process of the movement of the at least three sub-dies 1211, the central angle between any two sub-dies 1211 remains unchanged.

[0068] The object 0 to be detected, to which the nondestructive tensile testing device provided in the embodiment of the present application is applicable, is in the shape of an annular shape, such as a circular annular shape, a square annular shape, a polygonal annular shape, etc. When performing a tensile test, the object 0 to be detected is sleeved on the outside of the stretching die 121, that is, the outside of at least three sub-dies 1211. Since the at least three sub-dies 1211 are distributed circumferentially along the virtual central axis, when the at least three sub-dies 1211 are driven to move, forces are applied to different parts of the circumference of the object 0 to be detected, respectively, so as to drive each part of the object 0 to be detected to undergo tensile deformation respectively; further, since at least three sub-dies 1211 move simultaneously, and the central angle between any two sub-dies 1211 remains unchanged during the movement, each part of the object 0 to be detected is stretched simultaneously and equally, so the object 0 to be detected can be stretched and deformed in equal proportions as a whole.

[0069] Generally speaking, during the stretching deformation of the object to be detected 0, it is necessary to ensure that the central axis of the object to be detected 0 and the virtual central axis are always coincident, so as to ensure that the object to be detected 0 can be deformed in proportion. Therefore, in this embodiment, the circumferential outer contour shape of the stretching die 121 should be compatible with the inner ring shape of the object to be detected 0 in the natural state. For example, when the inner ring shape of the object to be detected 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 detected 0 is square, the circumferential outer contour shape of the stretching die 121 should also be square. Among them, 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 along the circumference of the virtual center axis. For example, when the number of sub-molds 1211 is three, the center angle between two adjacent sub-molds 1211 is 120°; when the number of sub-molds 1211 is four, the center angle between two adjacent sub-molds 1211 is 90°.

[0072] In the embodiment of the present application, since each sub-mold 1211 moves in a direction close to or away 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 motion trajectory. Figure 4 At least three sub-molds 1211 in the two mold assemblies 12 are respectively in the first position and the second position. Figure 4 As shown in the mold assembly 12 on the right side of the middle, when at least three sub-molds 1211 are all located in the first position, the radial dimension of the stretching mold 121 is the smallest, and is usually less than or equal to the inner diameter dimension of the object to be detected 0 in its natural state, so that the object to be detected 0 can be easily mounted on the stretching mold 121. In the process of at least three group molds moving from the first position to the second position, the radial dimension of the stretching mold 121 gradually increases, exceeding the inner diameter dimension of the object to be detected 0 in its natural state, so that the object to be detected 0 is gradually stretched. Figure 4 As shown in the mold assembly 12 on the left side, when at least three sub-molds 1211 are located in the second position, the radial dimension of the stretching mold 121 reaches the maximum and is usually larger than the inner diameter dimension of the object to be detected 0 in the natural state. At this time, there will be an interaction force between the object to be detected 0 (without fracture) 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. When all of the sub-molds 1211 are located at the first position, the distance between the sub-molds 1211 is the smallest, for example, adjacent sub-molds 1211 may contact each other or only have a small gap; when moving from the first position to the second position, the distance between any sub-mold 1211 and other sub-molds 1211 gradually increases; when all of the sub-molds 1211 are located at the second position, the distance between the sub-molds 1211 is the largest, and there is a large gap between adjacent sub-molds 1211.

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

[0075] The curved side surfaces 121111 of the sector columns 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 detected 0 are along the radial direction of the object to be detected 0 and are equal in magnitude, thereby ensuring that all parts of the object to be detected 0 are subjected to force at the same time and evenly, and the object to be detected 0 can achieve proportional tensile deformation.

[0076] In some embodiments of the present application, the number of drive components 13 can be at least three, and they are connected to the at least three sub-molds 1211 in a one-to-one transmission manner, so as to achieve synchronous movement. However, in this solution, the power sources of the at least three sub-molds 1211 are independent of each other. If they are to be driven simultaneously and with the same amount of movement, the control accuracy and driving reliability requirements of the drive components 13 are relatively high, and the increase in the number of drive components 13 will also lead to increased costs and large layout space.

[0077] Therefore, in other embodiments of the present application, Figure 3 As shown, at least three sub-molds 1211 can be driven by the same driving assembly 13. The mold assembly 12 includes a rotating disk 122, which is movably connected to the at least three sub-molds 1211 and is in transmission connection with the driving assembly 13; the driving assembly 13 drives the rotating disk 122 to rotate around the virtual central axis, thereby actuating the at least three sub-molds 1211 to move simultaneously.

[0078] The rotating disk 122 is connected to at least three sub-molds 1211 at the same time, which is equivalent to at least three sub-molds 1211 sharing the same power source, thereby improving the reliability of ensuring simultaneous driving, reducing the requirements for the drive component 13, saving equipment costs, and reducing the occupation of layout space.

[0079] Since the tensile deformation of the object 0 to be tested is usually small during the tensile test, but the accuracy requirement is high, it is necessary to perform precise transmission between the drive assembly 13 and the rotating disk 122, for example, through gear meshing transmission. 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 is meshed with the drive assembly 13 through the gear teeth. In another example, a gear shaft 123 may be connected to the disk surface of the rotating disk 122 away from the stretching die 121, and the gear shaft 123 is meshed with the drive assembly 13 for transmission.

[0080] Compared with other transmission methods, the gear meshing transmission method has the advantages of high transmission accuracy, good transmission reliability and smooth transmission.

[0081] In some embodiments of the present application, Figure 3 As shown, at least three sub-molds 1211 and the rotating disk 122 may be connected in a sliding manner. For example, at least three first slide grooves 1221 may be provided on the disk surface of the rotating disk 122 close to the stretching mold 121, and at least three sub-molds 1211 are slidably provided in the at least three first slide grooves 1221 in a one-to-one correspondence. When the rotating disk 122 rotates, at least three sub-molds 1211 slide in the corresponding first slide grooves 1221 at the same time, so as to have the same sliding amount relative to the rotating disk 122.

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

[0083] Alternatively, if Figure 5 As shown, the center line of the first slide groove 1221 is in the shape of a spiral line, that is, the movement trajectory of each sub-mold 1211 is in the shape of a spiral line. In this way, each sub-mold 1211 can slide more smoothly relative to the rotating disk 122.

[0084] In some embodiments of the present application, see Figure 3 Each sub-mold 1211 also includes a support plate 12112 and a sliding rod 12113; the support plate 12112 is connected to the fan surface of the fan-shaped column 12111 close to the rotating disk 122, and the plate area of ​​the support plate 12112 is larger than the plate area of ​​the fan surface; the sliding rod 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 sliding groove 1221.

[0085] "Sliding limit" means that two parts that slide relative to each other can only slide along a set trajectory. For example, for the slide bar 12113 and the first slide groove 1221, the slide bar 12113 can only slide along the extension direction of the center line of the slide groove, thereby ensuring that each sub-mold 1211 moves simultaneously and equally relative to the virtual center axis, thereby ensuring that the object 0 to be detected 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 supporting plate 12112. The first annular limiting disk 124 is provided with at least three first limiting grooves 1241 on the disk surface away from the rotating disk 122. One side of at least three first limiting grooves 1241 extends to the inner annular surface of the first annular limiting disk 124. The supporting plates 12112 of at least three sub-molds 1211 are located in the at least three first limiting grooves 1241 in a one-to-one correspondence. The length direction of the first limiting groove 1241 extends along the centerline direction of the fan surface of the fan-shaped column 12111 of the corresponding sub-mold 1211, thereby limiting the moving direction of the sub-mold 1211 to be parallel to the centerline direction of the fan surface of the fan-shaped column 12111.

[0087] Continue to see Figure 3 The mold assembly 12 may further include a second annular limiting plate 125 placed on the support plate 12112, and at least three second limiting grooves 1251 are provided on the inner ring wall of the second annular limiting plate 125, and the at least three second limiting grooves 1251 are opened toward the fan-shaped columns 12111 of at least three sub-molds 1211 in a one-to-one correspondence. The depth direction of each second limiting groove 1251 is parallel to the center line direction of the fan surface of the fan-shaped column 12111 of the corresponding sub-mold 1211, so each sub-mold 1211 is limited to reciprocating 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 are respectively moved in the specified directions, so that the movement directions of at least three sub-molds 1211 can be constrained. Since the centerline direction of the fan surface of the fan-shaped column 12111 of each sub-mold 1211 is generally parallel to the radial direction of the object to be detected 0, the at least three sub-molds 1211 whose movement directions are restricted as above also move simultaneously along the radial direction of the object to be detected 0, so that it can ensure that the various parts of the object to be detected 0 are uniformly applied with force, thereby ensuring that the object to be detected 0 is deformed in proportion.

[0089] Alternatively, if Figure 3 As shown, at least three second limiting grooves 1251 are arranged at intervals on the inner ring wall, so that a partition 1252 is formed on the disk body between two adjacent limiting grooves, and the partition 1252 is used to carry the object 0 to be detected.

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

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

[0092] In the embodiment of the present application, since the rotating disk 122 is driven to rotate, it is necessary to enable the rotating disk 122 to rotate relative to the bracket 11. Figure 6 As shown, the bracket 11 is provided with a mounting hole 111, the gear shaft 123 is sleeved with a bearing 126, and the stretching die 121 is installed in the mounting hole 111 through 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 driving assembly 13 may include a rotating motor 131, and a second gear 1311 is fixed on the 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, so that the rotating motor 131 can drive the gear shaft 123 to drive the rotating disk 122 to rotate, so that at least three sub-molds 1211 move.

[0094] Optionally, the meshing transmission member 132 includes two racks 1321, which are arranged along the length direction thereof and respectively mesh with the first gear 1231 and the second gear 1311. The detection assembly 14 includes a force detection member 141 located between the two racks 1321, and 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 pressure-fitted with the other rack 1321.

[0095] When the output shaft of the rotating motor 131 rotates, the second gear 1311 rotates and transmits the driving force to the rack 1321 meshing with it, and then the transmission force on the rack 1321 is transmitted to the other rack 1321 via the force detection part 141, so that the two racks 1321 and the force detection part 141 move together along the length direction of the rack 1321; while the other rack 1321 moves, it will drive the expected meshing first gear 1231 to rotate, and then the rotating disk 122 connected to the gear shaft 123 where the first gear 1231 is located also rotates synchronously, so that relative sliding occurs between each first slide groove 1221 and the corresponding slide rod 12113 of the sub-mold 1211. Since the first slide groove 1221 is spiral-shaped, with one end close to the center of the rotating disk 122 and the other end away from the center of the rotating disk 122, each sub-mold 1211 with a slide rod 12113 will move in a direction gradually approaching or away from the virtual center axis, thereby proportionally stretching the object to be detected 0, or proportionally shrinking the deformed object to be detected 0.

[0096] During this process, the force detection member 141 can collect the pressure transmitted by the rack 1321 that is pressure-matched with it in real time. In the embodiment of the present application, the working process of the device is: the rotating motor 131 drives the rack 1321 to move, thereby driving the first gear 1231 to rotate, and then driving at least three sub-molds 1211 to move, causing the object to be detected 0 sleeved on the outside of the at least three sub-molds 1211 to stretch and deform. Therefore, when performing a tensile test, the deformation (diameter change) of the object to be detected 0 under the required tensile value can be determined based on the material of the object to be detected 0 and the required tensile value to be tested. The 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 rotating disk 122 needs to rotate is determined, and then based on the transmission ratio of the first gear 1231 and the rack 1321, and the transmission ratio of the second gear 1311 and the rack 1321, the angle that the second gear 1311 of the rotating motor 131 needs to rotate is reversed, and finally the driving force that the rotating motor 131 needs to output is calculated based on this.

[0097] Generally speaking, the pressure collected by the force detection member 141 should correspond to the driving force output by the rotating motor 131. If the force detection member 141 detects an abnormal pressure at a certain moment during the tensile test, for example, it is less than the driving force output by the rotating motor 131, then it may be because the object to be detected 0 is damaged, broken, etc., so it can be determined that the tensile test of the object to be detected 0 is unqualified. If the pressure detected by the force detection member 141 during the tensile test is always normal and corresponds to the driving force output by the rotating motor 131, then it can be determined that the tensile test of the object to be detected 0 is qualified.

[0098] Optionally, the force detection member 141 is a force sensor, for example, an S-type sensor.

[0099] In some embodiments of the present application, Figure 8 As shown, the bracket 11 may be provided with a second slide groove 112, 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 the present application, Fig. 9 and Fig.10 As shown, the stretching detection unit 1 further includes two limit adjustment members 15 installed on the bracket 11 . The two limit adjustment members 15 are respectively located on both sides of the meshing transmission member 132 to limit the sliding distance of the meshing transmission member 132 .

[0101] Exemplarily, the limit adjustment member 15 may include a screw and a nut, and the screw passes through a through hole on the bracket 11 and is threadedly engaged with the nut to achieve fixation. The rack 1321 moves to a position against the screw during the transmission process, thereby being restricted from moving, thereby preventing the rack 1321 from being disengaged from the first gear 1231 or the second gear 1311.

[0102] In some embodiments of the present application, Figure 1 As shown, the device may also include a testing platform 2, a material conveying unit 3, a clamp unit 4 and a visual inspection unit 5; the stretching testing unit 1, the material conveying unit 3, the clamp unit 4 and the visual inspection unit 5 are all installed on the testing platform 2; the material conveying unit 3 is used to convey the object to be detected 0 to the stretching testing unit 1, and / or to recover and convey the object to be detected 0 that has been inspected by the stretching testing unit 1; the clamp unit 4 is used to clamp the object to be detected 0 from the material conveying unit 3, and place the object to be detected 0 so that it is sleeved on the outside of the stretching mold 121; the visual inspection unit 5 is used to collect the appearance performance parameters of the object to be detected 0 during the stretching deformation process.

[0103] like Figure 1As shown, the material conveying unit 3 includes a vibration plate and a conveying channel. Several objects 0 to be inspected are placed on the vibration plate and can be conveyed through the conveying channel to ensure automatic feeding and neat conveying. The clamp unit 4 includes a robotic arm, which can clamp the object 0 to be inspected that is conveyed to the specified position through the conveying channel, and place it on the stretching mold 121, so that the object 0 to be inspected is sleeved on the outside of the stretching mold 121 for tensile testing. The visual inspection unit 5 includes a CCD (charge coupled device) camera, which is arranged above the stretching mold 121. During the tensile test of the object 0 to be inspected, it can detect the appearance deformation of the object 0 to be inspected, so as to determine whether it has quality defects.

[0104] In some embodiments of the present application, Fig.11 As shown, the device further includes a box shell 6, which is mounted on the test bench 2 and cooperates with the table top of the test bench 2 to form a closed accommodating cavity, in which the tensile testing unit 1, the material conveying unit 3, the fixture unit 4 and the visual inspection unit 5 are all accommodated. In this way, the influence of external environmental factors such as strong airflow (such as wind), precipitation, dust and the like on the tensile test can be avoided, the detection accuracy can be improved, and the service life of the non-destructive tensile testing device can be increased.

[0105] The box shell 6 may be an integrally formed structure, which is detachably connected to the testing platform 2; or, the box shell 6 may be provided with an operating door that can be opened or closed.

[0106] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0107] The above description is only for the purpose of facilitating those skilled in the art to understand the technical solution of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A non-destructive tensile testing device, characterized in that: The device comprises a stretching detection unit (1), wherein the stretching detection unit (1) comprises a bracket (11), and a mold assembly (12), a driving assembly (13) and a detection assembly (14) mounted on the bracket (11); The mold assembly (12) comprises a stretching mold (121), wherein the stretching mold (121) is suitable for carrying the object to be detected (0) and allowing the object to be detected (0) to be sleeved on the outside of the stretching mold (121); The driving assembly (13) is used to drive the stretching die (121) to move relative to the bracket (11), so that the object to be detected (0) is stretched and deformed in equal proportion; The detection component (14) is used to collect mechanical performance parameters of the object to be detected (0) during the stretching deformation process.

2. The nondestructive tensile testing device according to claim 1, characterized in that: The stretching die (121) comprises at least three sub-dies (1211) distributed along the circumference of the virtual central axis, and the at least three sub-dies (1211) can be driven by the driving assembly (13) to move simultaneously in a direction close to or away from the virtual central axis; Wherein, during the movement of the at least three sub-moulds (1211), the central angle between any two of the sub-moulds (1211) remains unchanged.

3. The nondestructive tensile testing device according to claim 2, characterized in that: The motion trajectory of each of the sub-molds (1211) has a first position closest to the virtual central axis and a second position farthest from the virtual central axis; When any of the sub-molds (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 nondestructive tensile testing device according to claim 2 or 3, characterized in that: Each of the sub-molds (1211) comprises a fan-shaped column (12111), wherein the fan-shaped column (12111) has a curved side surface (121111), and the fan-shaped column (12111) contacts the object to be detected (0) through the curved side surface (121111) and stretches the object to be detected (0); Wherein, the curved side surfaces (121111) of the sector-shaped columns (12111) of the 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.

5. The nondestructive tensile testing device according to claim 4, characterized in that: The mold assembly (12) comprises a rotating disk (122), wherein the rotating disk (122) is movably connected to the at least three sub-molds (1211) and is transmission-connected to the driving assembly (13); The driving component (13) drives the rotating disk (122) to rotate around the virtual central axis, thereby actuating the at least three sub-molds (1211) to move simultaneously.

6. The nondestructive tensile testing device according to claim 5, characterized in that: At least three first slide grooves (1221) are arranged on a disk surface of the rotating disk (122), and the at least three sub-molds (1211) are slidably arranged in the at least three first slide grooves (1221) in a one-to-one correspondence; The circumferential side surface of the rotating disk (122) has gear teeth, and the gear teeth mesh with the driving component (13) for transmission; or the other disk surface of the rotating disk (122) is connected to a gear shaft (123), and the gear shaft (123) meshes with the driving component (13) for transmission.

7. The nondestructive tensile testing device according to claim 6, characterized in that: The center line of the first sliding groove (1221) is in the shape of a spiral line.

8. The non-destructive tensile testing device according to claim 6 or 7, characterized in that: Each of the sub-molds (1211) further includes a support plate (12112) and a slide bar (12113); The support plate (12112) is connected to the sector surface of the sector-shaped column (12111) close to the rotating disk (122), and the plate area of ​​the support plate (12112) is larger than the plate area of ​​the sector surface; The sliding rod (12113) is connected to a side of the support plate (12112) away from the fan-shaped column (12111), and is slidably limited to the corresponding first sliding groove (1221).

9. The nondestructive tensile testing device according to claim 8, characterized in that: The mold assembly (12) further comprises at least one of a first annular limiting plate (124) and a second annular limiting plate (125); The first annular limiting disk (124) is located between the rotating disk (122) and the supporting plate (12112), and at least three first limiting grooves (1241) are arranged on the disk surface of the first annular limiting disk (124) away from the rotating disk (122), one side of the at least three first limiting grooves (1241) extends to the inner ring surface of the first annular limiting disk (124), and the supporting plates (12112) of the at least three sub-molds (1211) are located in the at least three first limiting grooves (1241) in a one-to-one correspondence; The second annular limiting plate (125) is placed on the supporting plate (12112), and at least three second limiting grooves (1251) are arranged on the inner ring wall of the second annular limiting plate (125), and the at least three second limiting grooves (1251) open toward the fan-shaped columns (12111) of the at least three sub-molds (1211) in a one-to-one correspondence; Wherein, the first limiting groove (1241) and the second limiting groove (1251) both extend along the center line direction of the fan surface of the fan-shaped column (12111) of the corresponding sub-mold (1211) to limit the moving direction of the corresponding sub-mold (1211).

10. The non-destructive tensile testing device according to claim 9, characterized in that: The at least three second limiting grooves (1251) are arranged at intervals on the inner ring wall of the second annular limiting disk (125), so that the disk body between two adjacent second limiting grooves (1251) forms a partition (1252), and the partition (1252) is used to carry the object to be detected (0).

11. The nondestructive tensile testing device according to claim 10, characterized in that: Each of the sub-molds (1211) is provided with an avoidance notch (12114), and the sub-mold (1211) avoids the corresponding partition (1252) through the avoidance notch (12114) during movement.

12. The nondestructive tensile testing device according to claim 6, characterized in that: The bracket (11) is provided with a mounting hole (111), the gear shaft (123) is sleeved with a bearing (126), and the stretching die (121) is mounted in the mounting hole (111) via the bearing (126), so that 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).

13. The non-destructive tensile testing device according to claim 12, characterized in that: The driving assembly (13) comprises a rotating motor (131), a second gear (1311) being fixed on an output shaft of the rotating motor (131), and the second gear (1311) being directly meshed with the first gear (1231) or meshed with the first gear (1231) via a meshing transmission member (132).

14. The non-destructive tensile testing device according to claim 13, characterized in that: The meshing transmission member (132) comprises two racks (1321) arranged along the length direction, and the two racks (1321) are respectively meshed with the first gear (1231) and the second gear (1311); The detection component (14) comprises a force detection component (141) located between the two racks (1321), and the force detection component (141) is pressure-fitted with the two racks (1321) respectively, or the force detection component (141) is fixed to one of the racks (1321) and pressure-fitted with the other rack (1321).

15. The non-destructive tensile testing device according to claim 13 or 14, characterized in that: The bracket (11) is provided with a second sliding groove (112), and at least a part of the meshing transmission member (132) is slidably disposed in the second sliding groove (112).

16. The non-destructive tensile testing device according to claim 15, characterized in that: The stretch detection unit (1) further comprises two limit adjustment members (15) mounted on the bracket (11), wherein the two limit adjustment members (15) are respectively located on both sides of the meshing transmission member (132) to limit the sliding distance of the meshing transmission member (132).

17. The nondestructive tensile testing device according to claim 1, characterized in that: The device also includes a detection platform (2), a material conveying unit (3), a clamp unit (4) and a visual detection unit (5); The stretch detection unit (1), the material conveying unit (3), the clamp unit (4) and the visual detection unit (5) are all installed on the detection platform (2); The material conveying unit (3) is used to convey the object to be detected (0) to the stretching detection unit (1), and / or to recover and convey the object to be detected (0) after being detected by the stretching detection unit (1); The clamp unit (4) is used to clamp the object to be detected (0) from the material conveying unit (3), and place the object to be detected (0) so that it is sleeved on the outside of the stretching die (121); The visual inspection unit (5) is used to collect appearance performance parameters of the object to be inspected during the stretching deformation process.

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