Nuts and screws are things we often use in our daily lives. There are many kinds of nuts. Ordinary nuts often loosen or fall off automatically due to some external forces during use. In order to prevent this phenomenon from happening, people used their ingenuity to invent the self-locking nut we are going to talk about today. In this way, the function of the lock nut is clear at a glance, that is, it can resist vibration, loosening and falling off. So what are the types of self-locking nuts? Next, the editor will take you to understand.
Types of self-locking nuts
High-strength self-locking nuts
It is a classification of self-locking nuts with high strength and reliability. Mainly based on the introduction of European technology, it is used in road construction machinery, mining machinery, vibration machinery and equipment, etc. Currently, there are very few domestic manufacturers of such products.
Nylon self-locking nut
Nylon self-locking nut is a new type of high vibration-resistant and anti-loosening fastening part, which can be used in various mechanical and electrical products with temperatures of -50 to 100°C. . At present, the demand for nylon self-locking nuts in aerospace, aviation, tanks, mining machinery, automobile transportation machinery, agricultural machinery, textile machinery, electrical products and various types of machinery has increased sharply. This is because its anti-vibration and anti-loosening properties are greatly increased. Compared with various other anti-loosening devices, the vibration life is several times or even dozens of times longer. More than 80% of current mechanical equipment accidents are caused by loose fasteners, especially in mining machinery. The use of nylon self-locking nuts can prevent major accidents caused by loose fasteners.
Swimming self-locking nut
The double-ear sealed swimming self-locking nut specified in GJB? 125.1~125.6-86 consists of a sealing cover, a self-locking nut, a pressure ring, and a sealing ring 4 Composed of parts. It has compact structure and reliable sealing. It is suitable for products with working pressure not greater than 2 atm, working medium of gasoline, kerosene, water or air, and operating temperature of -50~100℃. However, it has certain difficulties in manufacturing process and air tightness test.
Spring self-locking nut
Spring clip self-locking nut, which consists of an S-shaped spring clip and a self-locking nut. The S-shaped spring clip is provided with a clamping self-locking nut. The clamping hole (3), the transition hole for passing the bolt and the guide hole for the bolt guide, the self-locking nut is placed between the clamping hole and the transition hole (4), and is clamped in the clamping hole Inside. This utility model fixes the self-locking nut on the connecting plate or support through the elastic force of the spring clip. The spring clip is not only the assembly carrier of the self-locking nut, but also serves as an assembly tool for the self-locking nut during assembly. In this way The structure is not only convenient for installation, but also has good reliability after installation.
Self-locking nuts
Self-locking nuts. There is a 30-degree wedge-shaped slope at the bottom of the female thread. When the bolt and nut are tightened to each other, the tip of the bolt presses tightly against the wedge-shaped slope of the Spirer thread, thus generating a large locking force. . Due to the change in the angle of the tooth profile, the normal force generated by the contact between the threads is at a 60-degree angle with the bolt axis, instead of the 30-degree angle like ordinary threads. Obviously, the normal pressure of the Schirb thread is much greater than the fastening pressure. Therefore, the anti-loosening friction generated will inevitably increase greatly. At the same time, when the male thread crest engages with the Spiril female thread, the tooth tip at the crest is easily deformed, so that the load is evenly distributed over the entire length of the contact spiral, which avoids a total of more than 80% when ordinary standard threads engage. The load is concentrated on the thread surface of the first and second threads. Therefore, Spir?k threaded couplings not only overcome the shortcomings of ordinary standard couplings that are prone to self-loosening under vibration conditions, but also extend their service life.
Introduction
General nuts will loosen on their own due to other reasons such as vibration during use. To prevent this phenomenon, self-locking nuts were invented. The main functions of self-locking nuts are to prevent loosening and resist vibration. For special occasions. Its working principle is generally self-locking by friction. Self-locking nuts are classified according to their functions: those with nylon rings, those with neck closures, and those with metal anti-loosening devices. They are all effective torque type lock nuts.
Principle
Self-locking nuts generally rely on friction. The principle is to press into the preset holes in the sheet metal through embossed teeth. Generally, the aperture of the square preset holes is slightly smaller than Pressure rivet nuts. The nut is connected to the locking mechanism. When the nut is tightened, the locking mechanism locks the ruler body and the ruler frame cannot move freely to achieve the purpose of locking. When the nut is loosened, the locking mechanism disengages the ruler body and the ruler frame moves along the edge of the ruler. The ruler body moves.
The types of self-locking nuts have been introduced. Self-locking nuts are generally used in some special industries, such as construction machinery, mining machinery and other industries that do not allow nuts to loosen and fall off. If we use ordinary nuts, it is better to use them in mining machinery. Once they loosen and fall off, the accident will be an irreparable tragedy. Therefore, for the personal safety of yourself and others, technicians should consider choosing self-locking nuts when operating some machines that are prone to nut loosening.
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