Tension detection device

Abstract

The utility model provides a tension detection device. The tension detection device comprises a bearing mechanism and a pulling mechanism. The bearing mechanism is configured to bear and position a workpiece and is installed on a base of a tension tester. The pulling mechanism comprises a pull rod and a pull head. And the pull rod is configured to be connected to a cross beam of the tension tester. The tension head is connected to the pull rod and extends towards one side of the pull rod, and the tension head is configured to extend into a hole of a nut riveted to the workpiece. And the pull rod is driven by the cross beam to move or has the moving trend direction which is perpendicular to the direction in which the tension head extends into the nut along the second direction. According to the tension detection device, the direction of the tension head extending into the hole of the nut is perpendicular to the direction of the pull rod which is pulled to move or generate the moving trend, so that the tension test can be performed on the nut which is riveted to the workpiece in the direction perpendicular to the hole axis.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of tension detection, and in particular to a tension detection device. Background Art

[0002] In terminal products such as mobile phones, nuts are often riveted. Traditional nuts generally use round nuts. The existing nut riveting strength is measured by tensile test. The round nut is riveted in the terminal product along the hole axis of the nut. The existing tensile test is performed after the pull rod is connected to the hole of the nut, that is, the tensile force applied to the pull rod is in the same direction as the riveting direction of the nut. However, a new type of nut has appeared. The hole axis of the new type of nut is perpendicular to the riveting direction, which makes it impossible to use the existing tensile test to measure the riveting strength of the new type of nut. Utility Model Content

[0003] In view of this, the present application provides a tension detection device to implement tension testing on a nut riveted to a workpiece in a direction perpendicular to the hole axis.

[0004] The present application proposes a tension detection device, which includes a bearing mechanism and a holding mechanism. The bearing mechanism is configured to bear and position a workpiece, and is installed on a base of a tension testing machine. The holding mechanism includes a pull rod and a tension head. The pull rod is configured to be connected to a crossbeam of the tension testing machine. The tension head is connected to the pull rod and extends to one side of the pull rod, and the tension head is configured to extend into a hole of a nut riveted to the workpiece. The direction in which the pull rod moves or has a tendency to move driven by the crossbeam is perpendicular to the direction in which the tension head extends into the nut along the second direction.

[0005] In the above-mentioned tension detection device, the tension detection device extends the tension head into the hole of the nut in a direction perpendicular to the direction in which the pull rod moves or generates a tendency to move under tension, so as to realize tension testing of the nut riveted to the workpiece in a direction perpendicular to the hole axis.

[0006] In some embodiments, the tension detection device further includes an overload protection mechanism, which includes a main body and a holding member. The holding member is configured to be connected between the crossbeam and the main body. The pull rod is connected to a side of the main body away from the holding member, and the holding member and the main body are disconnected when the tension borne by the pull rod reaches a set value.

[0007] In the above embodiment, the overload protection mechanism releases the connection between the holding member and the main body when the tension borne by the pull rod reaches a set value, so as to limit the ultimate pulling force applied by the pull rod to the nut, thereby reducing or avoiding the possibility of damage to the nut or damage to the riveting connection between the nut and the workpiece due to excessive force of the pull rod holding the nut.

[0008] In some embodiments, the main body includes a base, a supporting member and an elastic member. The base is provided with a first slide groove and a second slide groove that are connected. The holding member is configured to be able to enter and exit the first slide groove and slide along the first slide groove. A groove is provided on the side of the holding member facing the second slide groove, and the side wall of the groove is provided with a first guide surface inclined relative to the moving direction of the holding member. The supporting member and the elastic member are respectively accommodated in the second slide groove. The elastic member is located on the side of the supporting member away from the first slide groove, and is configured to drive the supporting member to move toward the first slide groove so that the supporting member is pushed into the groove. In the process of the holding member moving out of the first slide groove, the supporting member moves along the first guide surface to exit the groove.

[0009] In the above embodiment, the elastic member provides elastic force for the resisting member to resist the holding member. When the force exerted by the cross beam on the holding member is greater than the force exerted by the resisting member on the holding member, the resisting member moves along the first guide surface of the groove, causing the resisting member to move into the second sliding groove, thereby causing the holding member to separate from the resisting member. The holding member separates from the main body to prevent the pull rod from continuing to exert force on the nut to protect the nut.

[0010] In some embodiments, the main body further includes an adjusting member, an end of the second slide groove facing away from the first slide groove passes through the base, the adjusting member is threadedly connected to the groove wall of the second slide groove, and is located on the side of the elastic member facing away from the supporting member.

[0011] In the above embodiment, the adjusting member is rotated to adjust the connection length of the adjusting member threadedly connected to the groove wall of the second slide groove to adjust the force of the elastic member against the resisting member, and then adjust the force of the resisting member acting on the pulling member to adapt to the required pulling force setting value.

[0012] In some embodiments, the overload protection mechanism further comprises a connecting member, one end of which is configured to be detachably connected to the crossbeam, and the other end of which is provided with a first mounting groove. The holding member is provided with a first stopper. The first mounting groove passes through one side of the connecting member so that the first stopper enters the first mounting groove, and the groove wall of the first mounting groove stops the first stopper from moving along the direction of the connecting member toward the holding member.

[0013] In the above embodiment, the connection member and the holding member are connected by the first stopper cooperating with the first installation groove, and the first installation groove passes through one side of the connection member, so that the first stopper can enter the first installation groove to improve the installation convenience of the holding member and the connection member. The connection member can be installed on the tensile testing machine first, and then the remaining structure of the overload protection mechanism is connected to the connection member through the holding member, thereby improving the convenience of installing the overload protection mechanism on the tensile testing machine.

[0014] In some embodiments, the main body is provided with a second mounting groove, and the pull rod is provided with a second stopper. The second mounting groove passes through at least one side of the main body so that the second stopper enters the second mounting groove, and the groove wall of the second mounting groove stops the second stopper from moving along the holding member toward the pull rod.

[0015] In the above embodiment, the main body and the pull rod are detachably connected by cooperating with the second mounting groove and the second stopper, and the connection method is simple. The pull rod is a consumable part, which makes it convenient to replace the pull rod of the tension detection device.

[0016] In some embodiments, the tension detection device further includes a test block, which is configured such that when the pull rod is detached from the second installation slot, one end of the test block is installed in the second installation slot, and the other end of the test block is abutted against a structure fixed relative to the base.

[0017] In the above embodiment, the test block is installed in the second installation slot. By performing a tensile test on the test block first, the required tensile value can be obtained, thereby adapting to the test experiments of different nut riveted workpieces and being able to more effectively protect the nuts from being damaged, thereby improving the reliability of the tensile detection device.

[0018] In some embodiments, the pull rod is provided with a mounting hole, and the tension head is interference-fitted in the mounting hole. Or the pull rod is provided with a threaded hole, and one end of the tension head is provided with a thread and is threadedly connected to the threaded hole.

[0019] In the above embodiment, the pull rod and the tension head are connected by thread or interference fit, which makes the assembly simple and the tension head easy to replace.

[0020] In some embodiments, the tension detection device further includes a guide member, which is disposed on the bearing mechanism, and the guide member is provided with a second guide surface, and the second guide surface is configured to fit with one side of the pull rod.

[0021] In the above embodiment, the guide member provides guidance for the movement of the pull rod, thereby improving the stability of the direction of the force applied by the pull rod to the nut, thereby improving the accuracy of the tension test.

[0022] In some embodiments, the bearing mechanism includes a bearing member and a first guide rail, a first sliding member, a second guide rail, and a second sliding member. The first guide rail is configured to be mounted on a base, the first sliding member is slidably disposed on the first guide rail along a first direction, the second guide rail is disposed on the first sliding member, the second sliding member is slidably disposed on the second guide rail along a second direction, the bearing member is disposed on the second sliding member, the bearing member is configured to bear and position a workpiece, and the first direction and the second direction intersect.

[0023] In the above embodiment, the first guide rail and the first sliding member are slidably matched, and the second guide rail and the second sliding member are slidably matched, so that the supporting member can move along the first direction and the second direction, so that the nut on the supporting member corresponds to the position of the pull rod, so that multiple nuts can be easily switched when testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of a tensile detection device provided in an embodiment of the present application installed on a tensile testing machine.

[0025] Figure 2 for Figure 1 Schematic diagram of the tension detection device shown.

[0026] Figure 3 for Figure 2 Schematic diagram of the exploded view of the tension detection device shown.

[0027] Figure 4 for Figure 3 A partially exploded schematic diagram of the tension detection device shown.

[0028] Figure 5 for Figure 2 The schematic diagram of the exploded view of the overload protection mechanism and the holding mechanism in the tension detection device is shown.

[0029] Figure 6 for Figure 5 The diagram shown is a cross-sectional diagram of the overload protection mechanism and the holding mechanism after assembly.

[0030] Figure 7 for Figure 2 Schematic diagram of the holding mechanism in the tension detection device shown.

[0031] Figure 8 for Figure 7 A schematic diagram of a holding mechanism in another embodiment is shown.

[0032] Fig. 9 for Figure 2 The schematic diagram of the tension detection device shown is used to test the overload protection capability.

[0033] Fig.10 for Fig. 9 A schematic diagram of a partial cross-section of the tension detection device shown.

[0034] Fig.11 for Figure 1 A partial schematic diagram of a workpiece tested by the tensile testing device shown.

[0035] Main component symbols

[0036] Tension testing device 100

[0037] Carrying mechanism 10

[0038] Carrier 11

[0039] Substrate 111

[0040] The first positioning member 1111

[0041] Second positioning member 1113

[0042] Lock 113

[0043] Pressing piece 115

[0044] Through hole 1151

[0045] Lock slot 1153

[0046] First rail 12

[0047] First sliding member 13

[0048] Second guide rail 14

[0049] The second sliding member 15

[0050] The first stopper 16

[0051] The second stopper 17

[0052] Pulling mechanism 20

[0053] Tie rod 21

[0054] Mounting hole 2101

[0055] Threaded hole 2103

[0056] The second stopper 211

[0057] Tension head 23

[0058] Thread 231

[0059] Overload protection mechanism 30

[0060] Body 31

[0061] Base 311

[0062] First chute 3111

[0063] Second chute 3113

[0064] Second mounting slot 3115

[0065] Abutment 313

[0066] Elastic 315

[0067] Adjustment 317

[0068] Pulling piece 33

[0069] Groove 3301

[0070] The first guide surface 331

[0071] The first stopper 333

[0072] Part 13331

[0073] Part 2333

[0074] Connector 35

[0075] First installation slot 3501

[0076] First subslot 3502

[0077] Second subslot 3503

[0078] Blocking part 351

[0079] Test Block 40

[0080] The third stopper 41

[0081] Guide 50

[0082] The second guide surface 51

[0083] Contact part 53

[0084] Tensile testing machine 200

[0085] Base 201

[0086] Beam 203

[0087] Workpiece 300

[0088] Riveting hole 301

[0089] Reference surface 303

[0090] Nut 400

[0091] Riveting part 401

[0092] Hole 403

[0093] First direction X

[0094] Second direction Y

[0095] The third direction Z

[0096] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0097] In order to further illustrate the technical means and effects adopted by the present application to achieve the intended application purpose, the following is combined with the drawings and implementation methods. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0098] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0099] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0100] Please also see Figures 1 to 3 One embodiment of the present application provides a tension detection device 100. The tension detection device 100 is used to be installed in a tension testing machine 200. The tension testing machine 200 includes a base 201 and a beam 203 that can move relative to the base 201. The tension detection device 100 includes a bearing mechanism 10 and a holding mechanism 20. The bearing mechanism 10 is installed on the base 201, and the holding mechanism 20 is installed on the beam 203. A workpiece 300 riveted with a nut 400 is supported and positioned on the bearing mechanism 10.

[0101] In one embodiment, the pulling mechanism 20 is placed above the supporting mechanism 10 .

[0102] For the sake of clarity in the subsequent description, a first direction X, a second direction Y, and a third direction Z are defined as being perpendicular to each other, and the third direction Z is parallel to the direction from the supporting mechanism 10 to the holding mechanism 20. The supporting mechanism 10 is adjusted on the base 201 along the first direction X and the second direction Y so that the nut 400 of the workpiece 300 on the supporting mechanism 10 is opposite to the holding mechanism 20.

[0103] The pulling mechanism 20 acts on the nut 400 , and the crossbeam 203 drives the pulling mechanism 20 and the nut 400 to move along the third direction Z or have a tendency to move, so as to complete the tensile test of the nut 400 riveted to the workpiece 300 .

[0104] The holding mechanism 20 includes a pull rod 21 and a tension head 23. The pull rod 21 is configured to be connected to the cross beam 203. The tension head 23 is connected to the pull rod 21 and extends to one side of the pull rod 21, for example, the tension head 23 extends to one side of the pull rod 21 in a direction parallel to the second direction Y, so that the tension head 23 extends into the hole 403 of the nut 400. The pull rod 21 extends along the third direction Z, so that the extension direction of the tension head 23 (the axial direction of the hole 403 of the nut 400) is perpendicular to the extension direction of the pull rod 21 (the direction of movement or movement tendency of the pull rod 21).

[0105] In one embodiment, please refer to Figure 7The tension head 23 is a pin structure, and the pull rod 21 is provided with a mounting hole 2101. The mounting hole 2101 and one end of the tension head 23 are interference fit, so that the tension head 23 and the pull rod 21 are relatively fixed. It can be understood that the tension head 23 can also be other structures, as long as one end of the tension head 23 has an axis structure that matches the hole 403 of the nut 400. For example, in another embodiment, Figure 8 As shown, one end of the tension head 23 is provided with a thread 231, and the other end is configured to extend into the hole 403 of the nut 400. The pull rod 21 is provided with a threaded hole 2103, and one end of the tension head 23 provided with the thread 231 is connected to the threaded hole 2103, so that the tension head 23 is used to fix the pull rod 21 relatively. The pull rod 21 and the tension head 23 are threadedly connected or interference fit, which is simple to assemble and easy to replace the tension head 23.

[0106] The tension detection device 100 extends into the hole 403 of the nut 400 through the tension head 23 in a direction perpendicular to the direction in which the pull rod 21 moves or tends to move under tension, so as to be able to perform a tension test on the nut 400 riveted to the workpiece 300 in a direction perpendicular to the axis of the hole 403.

[0107] See also Figures 2 to 4 In one embodiment, the bearing mechanism 10 includes a bearing member 11 and a first guide rail 12, a first sliding member 13, a second guide rail 14 and a second sliding member 15. The first guide rail 12 is configured to be installed on the base 201. The first sliding member 13 is slidably disposed on the first guide rail 12 along a first direction X. The second guide rail 14 is disposed on the first sliding member 13. The second sliding member 15 is slidably disposed on the second guide rail 14 along a second direction Y. The bearing member 11 is disposed on the second sliding member 15. The bearing member 11 is configured to bear and position the workpiece 300.

[0108] The first guide rail 12 of the supporting mechanism 10 is first connected to the base 201, and then the user pushes the supporting member 11 to make the first sliding member 13 slide along the first guide rail 12 and the second sliding member 15 slide along the second guide rail 14 to change the position of the supporting member 11 until the nut 400 riveted to the workpiece 300 on the supporting member 11 corresponds to the pull rod 21, so that the pull rod 21 can extend into the hole 403 of the nut 400.

[0109] In one embodiment, the workpiece 300 is riveted with two nuts 400 , but the invention is not limited thereto.

[0110] The first guide rail 12 and the first sliding member 13 are slidably matched, and the second guide rail 14 and the second sliding member 15 are slidably matched, so that the supporting member 11 can move along the first direction X and the second direction Y, so that the nut 400 on the supporting member 11 corresponds to the position of the pull rod 21, so that multiple nuts 400 are easy to switch when testing.

[0111] It is understandable that in other embodiments, the carrier 11 may also be moved by a robot.

[0112] In one embodiment, when the cross beam 203 drives the pull rod 21 to move or have a tendency to move along the third direction Z, the user manually presses the support member 11 to stabilize the support member 11, but the present invention is not limited thereto. For example, in other embodiments, a pressing structure (not shown) may also be provided, and when the position adjustment of the support member 11 along the first direction X and the second direction Y is completed, the pressing structure presses the support member 11 to stabilize the position of the support member 11 relative to the tensile testing machine.

[0113] It is understandable that in other embodiments, when the workpiece 300 is riveted with a nut 400 , the first guide rail 12 , the first sliding member 13 , the second guide rail 14 and the second sliding member 15 may also be omitted, and the supporting member 11 is directly connected to the base 201 .

[0114] It can be understood that in other embodiments, the first guide rail 12 and the second guide rail 14 can also extend in two directions that intersect at an acute angle, such as 60°, 30° or other angles, and the supporting member 11 can slide along the two directions that intersect at an acute angle through the first sliding member 13 and the second sliding member 15, and the nut 400 on the supporting member 11 can also be moved to correspond to the pull rod 21.

[0115] In one embodiment, the carrier 11 includes a base plate 111, a lock 113 and a holding member 115. The base plate 111 is provided with a first positioning member 1111 and a second positioning member 1113. In one embodiment, the number of the first positioning member 1111 is one, and the number of the second positioning members 1113 is two, but not limited thereto. The first positioning member 1111 stops the workpiece 300 from moving along the first direction X, and the second positioning member 1113 stops the workpiece 300 from moving along the second direction Y. The first positioning member 1111 and the two second positioning members 1113 can respectively abut against two adjacent side walls of the workpiece 300, thereby realizing the positioning of the workpiece 300 along the first direction X and the second direction Y.

[0116] It is understandable that in other embodiments, the carrier 11 may also use other methods to position the workpiece 300. For example, the carrier 11 is provided with a groove that is shaped like the workpiece 300, and the workpiece 300 is positioned on the carrier 11 by being accommodated in the groove.

[0117] In one embodiment, the number of the lock buckles 113 is two. The two lock buckles 113 are rotatably disposed on the base plate 111. The holding member 115 is provided with a through hole 1151, and the through hole 1151 can expose the nut 400. The holding member 115 is also provided with a locking groove 1153. The number of the locking grooves 1153 is the same as the number of the lock buckles 113. After the workpiece 300 is positioned on the base plate 111, the holding member 115 is placed on the workpiece 300, and the two lock buckles 113 are rotated and pressed on the side of the holding member 115 away from the workpiece 300, and locked in the locking groove 1153.

[0118] The lock buckle 113 is rotatably connected to the base plate 111 . The lock buckle 113 is rotated to lock into the locking groove 1153 , so that the pressing member 115 can press and fix the workpiece 300 on the base plate 111 , which is simple and convenient.

[0119] It is understandable that in other embodiments, other methods may be used to press and fix the workpiece 300 . For example, the pressing member 115 is connected to the base plate 111 by bolts.

[0120] Please continue reading Figure 2 , Figure 5 and Figure 6 The tension detection shaft further includes an overload protection mechanism 30. The overload protection mechanism 30 is connected to the pull rod 21 and is configured to be connected to the cross beam 203. The overload protection mechanism 30 is connected between the cross beam 203 and the pull rod 21. When the set value is reached, the overload protection mechanism 30 cuts off the connection between the cross beam 203 and the pull rod 21 to control the ultimate tension value of the pull rod 21 holding the nut 400.

[0121] The overload protection mechanism 30 includes a main body 31 and a holding member 33. The holding member 33 is configured to be connected between the crossbeam 203 and the main body 31. The pull rod 21 is connected to the main body 31. The holding member 33 is connected to the main body 31 and is disconnected when the tension borne by the pull rod 21 reaches a set value. The overload protection mechanism 30 is disconnected from the main body 31 by the holding member 33 when the tension borne by the pull rod 21 reaches a set value, so as to limit the ultimate pulling force applied by the pull rod 21 to the nut 400, so as to reduce or avoid the possibility that the pull rod 21 pulls the nut 400 with excessive force, thereby damaging the nut 400 or destroying the riveting between the nut 400 and the workpiece 300.

[0122] It can be understood that in other embodiments, the overload protection mechanism 30 can also be omitted.

[0123] In one embodiment, the main body 31 includes a base 311, a holding member 313 and an elastic member 315. The base 311 is provided with a first slide groove 3111 and a second slide groove 3113 that are connected. The holding member 33 is configured to be able to enter and exit the first slide groove 3111 and slide along the first slide groove 3111. The pull rod 21 is connected to a side of the base 311 that is away from the holding member 33.

[0124] In one embodiment, the overload protection further includes a connecting member 35. The holding member 33 is connected to the crossbeam 203 via the connecting member 35.

[0125] In one embodiment, the number of the second slide groove 3113, the abutting member 313 and the elastic member 315 is two respectively. The two second slide grooves 3113 are located on both sides of the first slide groove 3111 and are respectively connected to the first slide groove 3111. Each abutting member 313 and each elastic member 315 are respectively installed in a corresponding second slide groove 3113. The elastic member 315 abuts against the side of the abutting member 313 away from the first slide groove 3111, and is configured to apply a force to the abutting member 313 to move toward the first slide groove 3111. The abutting members 313 in the two second slide grooves 3113 are clamped on the opposite sides of the holding member 33 under the action of the elastic member 315, so that the holding member 33 is connected to the main body 31.

[0126] A groove 3301 is provided on one side of the holding member 33 facing the second slide groove 3113. A first guide surface 331 inclined relative to the moving direction of the holding member 33 is provided on the side wall of the groove 3301. In one embodiment, the groove 3301 has two opposite side walls spaced apart along the third direction Z, and each side wall has a first guide surface 331. The first guide surfaces 331 of the two side walls are arranged at an angle facing the second slide groove 3113. When the holding member 33 enters the first slide groove 3111 from outside the main body 31 and enters between the two resisting members 313, the resisting member 313 slides along one of the two first guide surfaces 331 away from the pull rod 21 to gradually transition and push into the groove 3301, so that the holding member 33 is connected to the main body 31; when the holding member 33 moves from between the two resisting members 313 to the outside of the main body 31, the resisting member 313 slides along one of the two first guide surfaces 331 close to the pull rod 21 to gradually transition and exit the groove 3301, so that the holding member 33 is in contact and connected to the main body 31, thereby eliminating the force between the pull rod 21 and the holding member 33.

[0127] It is understandable that in other embodiments, the first guide surface 331 may be provided on only one side wall of the groove 3301 . For example, the first guide surface 331 provides a transition guide for the supporting member 313 to exit the groove 3301 .

[0128] The elastic member 315 provides elastic force for the supporting member 313 to support the holding member 33. When the force exerted by the beam 203 on the holding member 33 is greater than the force exerted by the supporting member 313 on the holding member 33, the supporting member 313 moves along the first guide surface 331 of the groove 3301, so that the supporting member 313 moves into the second slide groove 3113 and disengages from the holding member 33. The holding member 33 cannot exert force on the pull rod 21, thereby preventing the pull rod 21 from continuing to exert force on the nut 400, thereby reducing the risk of damage to the nut 400 or riveting damage caused by excessive force.

[0129] In one embodiment, the main body 31 further includes an adjusting member 317. One end of the second slide slot 3113 away from the first slide slot 3111 passes through the base 311. The adjusting member 317 is threadedly connected to the slot wall of the second slide slot 3113 and is located on the side of the elastic member 315 away from the abutting member 313.

[0130] By rotating the adjusting member 317, the connection length of the adjusting member 317 threadedly connected to the groove wall of the second sliding groove 3113 is adjusted to adjust the force of the elastic member 315 against the resisting member 313, and then adjust the force of the resisting member 313 acting on the pulling member 33 to adapt to the required pulling force setting value.

[0131] It can be understood that in other embodiments, when the tension setting value is a fixed value, the adjustment member 317 can be omitted.

[0132] See also Figure 2 and Figure 4 In one embodiment, the tension detection device 100 further includes a guide member 50. The guide member 50 is disposed on the bearing member 11 of the bearing mechanism 10. The guide member 50 is provided with a second guide surface 51. The second guide surface 51 is configured to fit with one side of the pull rod 21 to guide the pull rod 21 to move along the third direction Z.

[0133] In one embodiment, the number of the second guide surfaces 51 is two, but the present invention is not limited thereto. The two second guide surfaces 51 guide the pull rod 21 to move along the third direction Z when the pull rod 21 tests the two nuts 400 of the riveted workpiece 300 .

[0134] The guide member 50 provides guidance for the movement of the pull rod 21 , thereby improving the stability of the direction of the force applied by the pull rod 21 to the nut 400 , thereby improving the accuracy of the tension test.

[0135] It can be understood that in other embodiments, the guide member 50 can also be omitted.

[0136] See also Fig. 9 and Fig.10 In one embodiment, the tension detection device 100 further includes a test block 40. The position of the adjustment member 317 can be determined by testing with the aid of the test block 40. The tension detection device 100 further includes a guide member 50. The guide member 50 is disposed on the support member 11 of the support mechanism 10. The guide member 50 is provided with a third stopper 41. The number of the third stoppers 41 is two. The two third stoppers 41 are arranged at intervals. The test block 40 is generally a T-shaped block structure. The test block 40 is configured such that when the pull rod 21 is detached from the second mounting groove 3115, one end of the test block 40 is mounted in the second mounting groove 3115, and the other end abuts against a structure fixed relative to the base 201, for example, the guide member 50 of the tension detection device 100.

[0137] The test block 40 is installed in the second installation slot 3115 and is located between the two third stoppers 41. The holding member 33 drives the main body 31 and the test block 40 to move along the third direction Z, so that the test block 40 is stopped by the two third stoppers 41 along the third direction Z. The crossbeam 203 applies a pulling force along the third direction Z to the overload protection mechanism 30 and the test block 40. When the tension of the beam 203 is greater than the set value, the pull rod 21 and the main body 31 are not disconnected. At this time, it is necessary to rotate the adjusting piece 317 to make the adjusting piece 317 move along the second slide slot 3113 away from the first slide slot 3111, so that the elastic force applied by the elastic piece 315 to the supporting piece 313 is reduced, thereby reducing the connection force between the pull rod 21 and the main body 31, so as to facilitate the tension of the beam 203 to reach the set value; when the tension of the beam 203 is less than the set value, the main body 31 is separated from the pull rod 21. At this time, it is necessary to rotate the adjusting piece 317 to make the adjusting piece 317 move along the second slide slot 3113 toward the first slide slot 3111, so that the elastic force applied by the elastic piece 315 to the supporting piece 313 is increased, thereby increasing the connection force between the pull rod 21 and the main body 31, so as to facilitate the tension of the beam 203 to reach the set value; when the tension is equal to the set value, the holding piece 33 is separated from the main body 31, the test is ended, and the position of the adjusting piece 317 is determined.

[0138] By performing a tension test on the test block 40 in advance, the required tension setting value can be obtained, thereby adapting to the test experiment of riveting workpieces 300 with different nuts 400, and more effectively protecting the nuts 400 from damage, thereby improving the reliability of the tension detection device 100.

[0139] The guide member 50 provides guidance for the movement of the pull rod 21 , thereby improving the stability of the direction of the force applied by the pull rod 21 to the nut 400 , thereby improving the accuracy of the tension test.

[0140] It is understandable that in other embodiments, the guide member 50 may also be omitted. The number of the abutment portions 53 is set according to the number of the nuts 400 to be tested.

[0141] In one embodiment, one end of the connecting member 35 is detachably connected to the cross beam 203. For example, one end of the connecting member 35 is threadedly connected to the threaded hole of the cross beam 203. The other end of the connecting member 35 is detachably connected to the holding member 33. A first mounting groove 3501 is provided at one end of the connecting member 35 away from the cross beam 203. The holding member 33 is provided with a first stopper 333. The first mounting groove 3501 penetrates the connecting member 35 in a direction perpendicular to the third direction Z, so that the holding member 33 can enter the first mounting groove 3501 from the side of the connecting member 35. The groove wall of the first mounting groove 3501 stops the first stopper 333 along the third direction Z to prevent the holding member 33 from falling from the connecting member 35 to the supporting mechanism 10 along the third direction Z.

[0142] In one embodiment, the first stopper 333 includes a first portion 3331 and a second portion 3333 connected in sequence along the third direction Z. The second portion 3333 extends to the outer side of the first portion 3331 in a direction perpendicular to the third direction Z, so that the first stopper 333 is roughly T-shaped. The first installation groove 3501 includes a first sub-groove 3502 and a second sub-groove 3503 connected in sequence along the third direction Z. The projection of the second sub-groove 3503 along the third direction Z is located in the first sub-groove 3502, so that the first installation groove 3501 is roughly T-shaped. The first portion 3331 is accommodated in the first sub-groove 3502, and the second portion 3333 is accommodated in the second sub-groove 3503. The first portion 3331 is stopped by the groove wall of the first sub-groove 3502 facing the second sub-groove 3503, so as to prevent the first portion 3331 from passing through the first sub-groove 3502 along the third direction Z, causing the holding member 33 to be separated from the connecting member 35.

[0143] The connection member 35 and the holding member 33 are connected by the first stopper 333 and the first installation groove 3501. The first installation groove 3501 passes through one side of the connection member 35, so that the first stopper 333 can enter the first installation groove 3501 to improve the installation convenience of the holding member 33 and the connection member 35. The connection member 35 can be installed on the tensile testing machine 200 first, and then the remaining structure of the overload protection mechanism 30 is connected to the connection member 35 through the holding member 33, thereby improving the convenience of installing the overload protection mechanism 30 on the tensile testing machine 200.

[0144] The connecting member 35 is further provided with a blocking portion 351. The blocking portion 351 is located at one side of the first installation groove 3501 that passes through the connecting member 35. When the first stopper 333 passes over the blocking portion 351 and enters the first installation groove 3501, and moves toward the pull rod 21 along the third direction Z until it is in contact with the bottom wall of the first installation groove 3501, the blocking portion 351 prevents the first stopper 333 from moving out of the first installation groove 3501.

[0145] It can be understood that in other embodiments, the blocking portion 351 can be omitted.

[0146] It is understandable that in other embodiments, the connecting member 35 may also be omitted. The holding member 33 is directly connected to the crossbeam 203 .

[0147] In one embodiment, the main body 31 is provided with a second mounting groove 3115, and the second mounting groove 3115 is located on a side of the base 311 away from the holding member 33. The pull rod 21 is provided with a second stopper 211. The second mounting groove 3115 is substantially a T-shaped groove, and the second stopper 211 is substantially T-shaped. The second mounting groove 3115 passes through at least one side of the main body 31, so that the second stopper 211 enters the second mounting groove 3115. The groove wall of the second mounting groove 3115 stops the second stopper 211 from moving along the holding member 33 toward the pull rod 21, so that the pull rod 21 is detachably connected to the main body 31.

[0148] In the above embodiment, the main body 31 and the pull rod 21 are detachably connected through the second installation groove 3115 and the second stopper 211, and the connection method is simple. The pull rod 21 is a consumable part, which makes it convenient to replace the pull rod 21 of the tension detection device 100.

[0149] It can be understood that in other embodiments, the first mounting groove 3501 and the second mounting groove 3115 can also be other shapes, for example, an L-shaped groove, a V-shaped groove, a W-shaped groove, etc. The first stop portion 333 imitates the shape of the first mounting groove 3501, and the second stop portion 211 imitates the shape of the second mounting groove 3115, so as to realize that the groove wall of the first mounting groove 3501 stops the first stop portion 333 from moving in the opposite direction of the first direction X, and the groove wall of the second mounting groove 3115 stops the second stop portion 211 from moving in the opposite direction Y.

[0150] At the end of the test of the tensile testing device, whether the riveting of the nut 400 is qualified can be determined based on the change in the relative position accuracy between the workpiece 300 and the nut 400. Fig.11 As shown, the workpiece 300 is provided with a riveting hole 301 and a reference surface 303 located around the riveting hole 301. The nut 400 is provided with a riveting portion 401. The riveting portion 401 is riveted in the riveting hole 301 and is flush with the reference surface 303.

[0151] In one embodiment, after the nut 400 completes the tensile test, three measuring points A1, A2, and A3 are selected on the riveted portion 401 of the nut 400, and on the reference surface 303, a measuring point B1 is selected in an area close to the measuring point A1, a measuring point B2 is selected in an area close to the measuring point A2, and a measuring point B3 is selected in an area close to the measuring point A3. The step difference T1 between the measuring point A1 and the measuring point B1 is measured, the step difference T2 between the measuring point A2 and the measuring point B2 is measured, and the step difference T3 between the measuring point A3 and the measuring point B3 is measured. When the step difference T1, the step difference T2, and the step difference T3 are respectively within ±0.03 mm, the nut 400 is qualified for riveting, otherwise it is unqualified.

[0152] It is understood that in other embodiments, the method for measuring the pass may also be other ways, such as by measuring the step difference between the edge of the riveted portion 401 and the reference surface 303. The pass criteria may also be other, for example, when the step difference T1, the step difference T2, and the step difference T3 are respectively ±0.05 mm, the nut 400 is riveted pass.

[0153] In the above-mentioned tension detection device 100, the tension detection device 100 extends into the hole 403 of the nut 400 through the tension head 23 in a direction perpendicular to the direction in which the pull rod 21 moves or generates a tendency to move under tension, so as to be able to perform a tension test on the nut 400 riveted to the workpiece 300 in a direction perpendicular to the axis of the hole 403.

[0154] In addition, those skilled in the art should recognize that the above embodiments are only used to illustrate the present application and are not intended to be limiting of the present application. As long as they are within the spirit and scope of the present application, appropriate changes and modifications to the above embodiments are within the scope of the present application.

Claims

1. A tension detection device, comprising: The bearing mechanism is configured to bear and position the workpiece and is installed on a base of a tensile testing machine; characterized in that the tensile testing device further comprises: The holding mechanism comprises: a tension rod configured to be connected to a crossbeam of the tensile testing machine; and A tension head connected to the pull rod and extending toward one side of the pull rod, wherein the tension head is configured to extend into a hole of a nut riveted to the workpiece; The direction in which the pull rod moves or has a tendency to move driven by the crossbeam is perpendicular to the direction in which the tension head extends into the nut.

2. The tension detection device according to claim 1, characterized in that: The tension detection device also includes an overload protection mechanism, which includes: the subject; and A holding member, configured to be connected between the crossbeam and the main body; The pull rod is connected to a side of the main body away from the holding member, and the holding member and the main body are disconnected when the pulling force borne by the pull rod reaches a set value.

3. The tension detection device according to claim 2, characterized in that: The subject includes: A base is provided with a first slide groove and a second slide groove in communication; the holding member is configured to be able to enter and exit the first slide groove and slide along the first slide groove; the holding member is provided with a groove on one side facing the second slide groove, and the side wall of the groove is provided with a first guide surface inclined relative to the moving direction of the holding member; and The supporting member and the elastic member are respectively accommodated in the second slide groove; the elastic member is located on the side of the supporting member away from the first slide groove, and is configured to drive the supporting member to move toward the first slide groove so that the supporting member is pushed into the groove; during the process of the pulling member moving out of the first slide groove, the supporting member moves along the first guide surface to exit the groove.

4. The tension detection device according to claim 3, characterized in that: The main body also includes an adjusting member, and one end of the second slide groove away from the first slide groove passes through the base. The adjusting member is threadedly connected to the groove wall of the second slide groove and is located on a side of the elastic member away from the supporting member.

5. The tension detection device according to claim 2, characterized in that: The overload protection mechanism further includes a connecting member, one end of which is configured to be detachably connected to the crossbeam, and the other end of which is provided with a first mounting groove; the holding member is provided with a first stopper; The first installation groove passes through one side of the connecting member, so that the first stop portion enters the first installation groove, and the groove wall of the first installation groove stops the first stop portion from moving along the connecting member toward the holding member.

6. The tension detection device according to claim 2, characterized in that: The main body is provided with a second mounting groove, and the pull rod is provided with a second stopper; The second installation groove passes through at least one side of the main body, so that the second stop portion enters the second installation groove, and the groove wall of the second installation groove stops the second stop portion from moving along the holding member toward the pull rod.

7. The tension detection device according to claim 6, characterized in that: The tension detection device further comprises a test block, wherein when the pull rod is detached from the second installation slot, one end of the test block is installed in the second installation slot, and the other end is abutted against a structure fixed relative to the base.

8. The tension detection device according to claim 1, characterized in that: The pull rod is provided with a mounting hole, and the tension head is interference-fitted in the mounting hole; or The pull rod is provided with a threaded hole, and one end of the tension head is provided with a thread and is threadedly connected to the threaded hole.

9. The tension detection device according to claim 1, characterized in that: The tension detection device further comprises a guide member, which is arranged on the bearing mechanism and has a second guide surface, and the second guide surface is configured to fit with one side of the pull rod.

10. The tension detection device according to claim 1, characterized in that: The bearing mechanism comprises a bearing member and a first guide rail, a first sliding member, a second guide rail and a second sliding member; The first guide rail is configured to be installed on the base, the first sliding member is slidably disposed on the first guide rail along a first direction, the second guide rail is disposed on the first sliding member, the second sliding member is slidably disposed on the second guide rail along a second direction, the supporting member is disposed on the second sliding member, the supporting member is configured to carry and position the workpiece, and the first direction and the second direction intersect.

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