Service HotlineAll kinds of industrial equipment need to be installed on the equipment foundation for work and operation. The equipment foundation includes concrete foundation, steel base, steel platform, steel frame and other forms.
In order to achieve this technical purpose, the plan of Guangdong Yueluo Hardware Industry Co., Ltd. is: a new type of open rivet, including a rivet body and a mandrel, the rivet body and one end of the mandrel are fixedly connected, and the lower end of the rivet body is provided with There is a round table, the top of the mandrel is provided with a nail head pit, the mandrel is provided with a stop groove, the lower side of the stop groove is provided with a mandrel breakpoint, and the mandrel is set on the mandrel. There is a stop ring, the stop ring is located on the lower side of the round table, and the lower side of the stop ring is provided with an assembly warp.
In addition, the angle aluminum connection structure itself has structural defects of poor torsional and shear resistance, and many projects use larger insulating glass to meet the requirements of architects, resulting in a larger self-weight. In the event of a natural disaster such as an earthquake that will cause the curtain wall to shake violently, the bolts on the angle aluminum are prone to breakage, and the seismic performance is not good. Especially for the beam with the open structure, since the angle aluminum is installed in the opening cavity of the beam, the inertia moment of the beam is small, and the torsion resistance and shear resistance performance of the force are worse.
A kind of screw provided by Yueluo, the rod body of the screw rod has a thread segment, and the two ends of the thread segment are respectively provided with annular and two convex rings. The nominal size of the thread segment, and the distance from the convex ring at the rear end of the screw in the screwing direction to the rod core is greater than the nominal size of the thread segment.
Countersunk head screws are mostly used after installation, and the surface of the parts cannot be raised, and the parts to be fastened have two thicknesses. Thickness, after the screw is tightened, there is still a part of the screw thread that does not enter the threaded hole. In this case, the countersunk head screw can definitely be tightened. There is usually a situation where the thickness of the fastened part is less than the height of the head of the countersunk head screw, which is commonly seen in sheet metal parts in mechanical equipment, such as the connection between the hinge of the chassis and the door and the box; the sheet metal of the equipment The connection of the cover to the equipment, etc. Due to the small thickness of the part, the tightened sheet metal part, the screw through hole completely becomes a conical hole, in this case, when the countersunk head screw is tightened, the screw head is not a tapered surface to press the sheet metal part , but the bottom of the screw head and the top of the threaded hole are squeezed. Although it feels that the screw is tightened, the sheet metal part is stuck instead of being pressed. In this case, although it feels that the screw is tightened, the sheet metal The gold pieces were indeed not tightened. This is a very common situation. Let’s talk about the reasons for the processing: the head cone of the countersunk screw has a 90° conical angle, and the apex angle of the newly bought drill is usually 118°-120°. Some workers who lack training do not know this angle is poor. It is often used to ream the hole with a 120° drill bit, which results in that when the countersunk head screw is tightened, it is not the conical surface of the head, but a line at the bottom of the screw head, which is one of the reasons why the so-called countersunk head screw cannot be tightened. , it's not the screw's fault.
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