Service HotlineThe existing open-type blind rivets are widely used, usually composed of an iron rivet shell and an iron or stainless steel mandrel. During the riveting process, the open-type rivets are often unstable and biased due to the unsteady breaking force of the mandrel. When the foam is riveted, the nail head is directly pulled into the foam layer to damage the product structure. And there may be safety hazards such as scratching the operator during the installation process due to the exposed nail core. At the same time, due to the expansion of the rivet shell hole, the nail head will be loose inside.
In machine tool processing, it is often necessary to calibrate and debug the probe. The method of manually correcting the detection is inefficient and the accuracy is unstable. In addition, accidents such as collisions will occur. However, calibration tools such as ring gauges are expensive, have large working strokes and poor versatility. Technical realization elements: In view of the above content, it is necessary to provide a positioning pin for probe calibration to solve the above problems. A positioning pin is used for calibrating a probe, the positioning pin includes a connected cylinder and a cylinder, the cylinder is used to be installed on a jig in a machine tool, and the end of the cylinder away from the cylinder is provided with a measuring hole to calibrate the probe. Further, the positioning pin is also provided with a chip removal hole, one end of the chip removal hole is connected to the measuring hole, the other end of the chip removal hole penetrates the end of the cylinder away from the cylinder, and the chip removal hole is used for discharging machining chips and cutting fluid. Further, the diameter of the chip removal hole is smaller than the diameter of the measuring hole. Further, the positioning pin further includes a positioning piece, the positioning piece includes a base and a magnetic piece, one end of the base is provided with a mounting hole for installing the magnetic piece, and the other end of the base is provided with a limiting hole for mounting the column. Further, the limiting hole communicates with the mounting hole. Further, the limiting hole is a blind hole. Further, the diameter of the cylinder is larger than the diameter of the cylinder. Further, the measuring hole is a cylindrical hole. Further, the diameter of the cylindrical hole is 4 mm. Further, the end face of one end of the cylinder provided with the measuring hole is a curved surface, and the end faces the peripheral wall of the cylinder to bend and transition to connect the peripheral wall. The positioning pin of Guangdong Yueluo Hardware Industry Co., Ltd. uses the measuring hole to carry out the probe. It is easy to operate, simple in structure and highly versatile. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a positioning pin of an embodiment of Guangdong Yueluo Hardware Industry Co., Ltd. FIG. 2 is a three-dimensional schematic view of the positioning pin shown in FIG. 1 without a positioning member. FIG. 3 is an exploded schematic view of the positioning pin shown in FIG. 1 . FIG. 4 is a cross-sectional view of the positioning pin shown in FIG. 1 along the line IV-IV. Description of main components and symbols Locating pin 100 Cylinder 10 Measuring hole 11 Chip removal hole 12 Cylinder 20 Positioning piece 30 Base 32 Mounting hole 321 Limiting hole 323 Magnetic piece 34 The following specific embodiments will be further described in conjunction with the above drawings Guangdong Yueluo Hardware Industrial Co., Ltd. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The technical solutions in the embodiments of Guangdong Yueluo Hardware Industry Co., Ltd. will be clearly and completely described below with reference to the accompanying drawings in the embodiments of Guangdong Yueluo Hardware Industry Co., Ltd. Obviously, the described embodiments are only Some examples of Guangdong Yueluo Hardware Industry Co., Ltd. are not all examples. Based on the embodiments in Guangdong Yueluo Hardware Industry Co., Ltd., all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection scope of Guangdong Yueluo Hardware Industry Co., Ltd. It should be noted that when an element is referred to as being connected to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being disposed on another element, it can be directly disposed on the other element or intervening elements may also be present. Unless otherwise defined, all technical and scientific terms used herein are related to those of Guangdong Yueluo Hardware Industry Co., Ltd.
As one of the screws, self-tapping screws can directly drill holes on the plate to be fixed by themselves and lock them together with the plate to be fixed. They are easy to use and have a good fixing effect, so they are widely used. However, in the prior art, when the screw is perforated on the plate to be fixed, it is prone to skew, which affects the fixing effect and also reduces the aesthetics. To sum up, how to overcome the above-mentioned defects of the screw fixing method in the prior art is a technical problem to be solved urgently by those skilled in the art.
The contact surface between the existing chassis and the main board is generally not a horizontal plane due to processing reasons, especially the main board is prone to warping deformation. It will increase, resulting in deformation of the motherboard and poor memory contact, affecting normal use.
The anti-rotation T-bolt includes a screw rod and a head. An anti-rotation protrusion is designed at the connection between the head and the screw. The cross-section of the anti-rotation protrusion is a square corner with the screw radius as the side length. One anti-rotation protruding shoot can be designed, or two can be designed. In order to ensure the uniform force of the bolt, two are designed.
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