Pulling nail locking torque measuring device

Abstract

The invention belongs to the standard component detecting technology and especially relates to a device for measuring locking torque of a screw thread self-plugging rivet. The device for measuring locking torque of a screw thread self-plugging rivet comprises a fixing end (21), a supporting frame (22), a bearing (23), a back-up ring (24), a supporting nut (25), a screw thread self-plugging rivet installation interlayer (26). The bearing (23) is assembled on the supporting nut (25) and then the two are both put into the supporting frame (22) which has a frame structure. The back-up ring (24) is stuck in a neck of the supporting nut (25) and the size of the supporting nut (25) bottom is larger than the diameter of a top opening hole of the supporting frame (22). The fixing end (21) passes through the top opening hole of the supporting frame (22) and then is screwed in the threaded hole of the supporting nut (25), wherein the end face of the fixing end (21) is provided with a groove which matches with a screw thread self-plugging rivet head. The screw thread self-plugging rivet installation interlayer (26) is stuck at the bottom of the supporting frame (22). By use of the device for measuring locking torque of a screw thread self-plugging rivet, locking torque of a screw thread self-plugging rivet under installation state can be measured, which is more suitable for working condition of screw thread self-plugging rivets, mechanical damage can be avoided, and the operation is simple.

Description

technical field [0001] The invention belongs to the detection technology of standard parts, and in particular relates to a measuring device for locking torque of pulling nails. Background technique [0002] Thread blind rivets (hereinafter referred to as rivets) are a new type of single-sided connector widely used in equipment, mainly composed of the following parts, drive nut 01, nail body 02, insert 03, ring 04, core rod 05, See figure 1 , see the assembled nail figure 2 . [0003] The installation of the nail pulling is to lock the drive nut 01, rotate the core rod 05, and drive the core rod forward through the thread. When the ring 04 touches the interlayer, it begins to deform. When the ring 04 deforms to a certain extent, the broken diameter of the core rod 05 The slot will break to complete the installation, see image 3 . [0004] Locking torque is one of the main performance indicators of the nail, and its test requirements are: the nail installed on the inter...

AI Technical Summary

Problems solved by technology

[0008] The above two methods all have different degrees of deficiencies. Method 1 does not completely install the nail, and the cut-diameter groove is not broken, which cannot truly reflect the actual installation state of the nail.

Method 2: Before the test, the nail was machined, which may affect its physical properties. At the same time, the installation interlayer should be slightly smaller than the actual interlayer, which cannot reflect its real state

Images