What are the methods of mechanical anti loosening, and what are the methods of thread anti loosening

Mechanical anti-loosening method.

1. Groove nut and cotter pin.

Anti-loosening: After the groove nut is tightened, use the cotter pin to pass through the small hole of the bolt tail and the groove of the nut, or use the ordinary nut to tighten it and drill the pin hole.

2. Round nut and stop moving gasket.

The inner tongue of the washer is embedded in the groove of the bolt (shaft), and one of the folds of the outer tongue of the washer is embedded in one of the grooves of the nut after tightening the nut.

3. Stop gasket: After the nut is tightened, bend the single or double ear stop washer to the side of the nut and the connected part respectively to achieve anti-loosening. If two bolts need to be double-interlocked, a double-lock spacer can be used.

4. Tandem steel wire anti-loosening: use low carbon steel.

The steel wire is threaded into the hole of each screw head, and the screws are connected in series so that they brake each other. This structure requires attention to the direction in which the wire is threaded.

cotter pins, check washers, stop washers, tandem steel wires.

1. The double nuts are tightened against loosening. Tighten two nuts in succession on the screw. The constant pressure between the contact surfaces of the nut is generated, and the screw screw part inside the nut is pulled and the nut is compressed, and this group of closing forces in turn forms a frictional force that is not affected by changes in the external load.

The structure is simple and easy to use, but the structure size is large.

Ideal for loosening connections on smooth, low-speed, heavy-duty fixtures. The spring washer is anti-loosening, and a spring washer is added between the mating plane of the nut and the original nut.

The spring washer is prevented from loosening by the elastic force generated by the flattening of the tightened nut and the pressure between the thread pairs. The tip of the washer bevel cut should be unscrewed against the nut to prevent the nut from reversing. Planes (nuts and connectors) that are in contact with the spring washer are easily damaged and used for general connections.

2. The lock nut is anti-loose. Use a lock nut instead of a nut for anti-loosening (such as a nylon ring lock nut with a nylon ring at its end to tighten the bolt and make the thread pair compressed), the structure is simple, and it can be used for multiple assembly and disassembly connections.

Mechanical anti-loosening method.

1. Anti-loosening of groove nut and cotter pin: After the groove nut is tightened, use the cotter pin to pass through the small hole of the bolt tail and the groove of the code fiber hand nut, or it can be tightened with an ordinary nut and drilled with a pin hole;

2. Round nut and stop motion gasket: make the inner tongue of the washer embedded in the groove of the bolt (shaft), and one of the folds of the outer tongue of the washer is embedded in a groove of the nut after tightening the nut;

3. Stop gasket: After the nut is tightened, the single or double ear stop washer is bent and tightened to the side of the nut and the connected piece respectively to achieve anti-loosening. If two bolts need to be double-interlocked, a double-lock spacer can be used.

4. Vertical Hui tandem steel wire anti-loosening: use low carbon steel wire to penetrate into the hole of each screw head, and connect each screw in series to make it brake each other. This structure requires attention to the direction in which the wire is threaded.

<> "As we all know, screws are an indispensable industrial item in our daily lives. So the question is, what are the methods of anti-loosening of screws? What are the precautions when using it?

What are the methods of anti-loosening of screws.

The gasket can be flattened for anti-loosening, which has the advantage of low cost, easy installation, and suitable for frequent assembly and disassembly. Of course, you can also use screw anti-loosening liquid, we only need to drop it on the screw tightening, so as to achieve the anti-loosening effect. In addition, a layer of sealant is applied to the thread before the screw is used to prevent the screw from loosening.

What are the precautions for using stainless steel screws.

1. First of all, when we store stainless steel screws, we must strengthen protection.

2. Secondly, when transporting stainless steel screws, we must pay attention to handling them gently to avoid damaging the product by shaking the screw fasteners significantly.

3. Next, when using stainless steel screws, if you encounter the nuts, pads and other connectors that need to be used together, you should fully grasp the product performance that matches the screws and fully cooperate.

4. When using stainless steel screws, we must fully understand the correct operation method of the product, so as to avoid different degrees of damage to stainless steel screws due to improper use.

5. In addition, in the process of purchasing stainless steel open cavity screws, we should take the products produced by regular manufacturers as the main purchase object, rather than buying inferior screws for the sake of cheapness.

Screw moisture-proof and moisture-proof method.

1. Vibrate machinery, use solvent-free paint as much as possible.

2. It is best to use impregnating paint without oxidizing components, such as: epoxy urethanyl, undenatured epoxy (epoxy-) based impregnating paint.

3. Buy paint with good hydrolysis resistance.

Commonly used friction anti-loosening methods are: double nut, spring washer.

Fasten the elastic nut, self-locking nut, self-locking nut with nylon, set screw fixing, interference fit thread.

The commonly used mechanical methods of anti-loosening mainly include: cotter pin anti-loosening, stop washer anti-loosening, and duplex stop gasket.

Anti-loosening. Commonly used permanent stop and anti-loosening methods are: welding, punching point, flanging, extrusion, bonding, etc.

There are four methods of thread anti-loosening.

The first is friction and anti-loosening, which mainly relies on increasing friction; The second is mechanical anti-loosening, which mainly uses pins, gaskets, and steel wires to jam the nut; The third is riveting and anti-loosening, which is mainly to rivet and weld the thread pair. The fourth is structural anti-loosening, that is, Down's thread anti-loosening.

The first three methods are traditional anti-loosening methods, and the fourth is a new type of anti-loosening method, which is not yet known to most people.

The third method is very limited in scope and cannot be used in many situations.

The main problem of the second method is that its anti-loosening method has no preload, that is, when the bolt is loosened to the anti-loosening position, the anti-loosening method can only be effective. Therefore, this way is not actually anti-loosening, but anti-shedding.

It shows that the bolt is looser than tight.

The above three anti-loosening methods, the fundamental point is to rely on the third party force to prevent loosening, how big the third party force, how good the anti-loosening effect is. The effect is nothing more than by increasing the friction until it is welded to death.

Is it possible to break through the traditional thread anti-loosening method without relying on a third party? The Down's thread anti-loosening method gives the answer, which is the fourth anti-loosening method, that is, the structural anti-loosening method.

The Tang thread is a major invention of the Chinese in mechanical basic parts, and it is the most significant invention in the field of thread since the invention of thread.

The Down thread has both left-handed and right-handed threads. It can be mated with both left-hand and right-hand threads. Two different types of nuts are used for the joint.

The nut on the working bearing surface is called the fastening nut, and the nut on the non-supporting surface is called the lock nut. When using, pre-tighten the fastening nut first, and then pre-tighten the lock nut.

In the case of vibration and impact, the fastening nut will loosen, but because the loosening direction of the fastening nut is the tightening direction of the locking nut, the tightening of the locking nut just prevents the loosening of the fastening nut, resulting in the fastening nut can not be loosened. Down's threaded fasteners use the contradiction of the thread itself to loosen and restrict loosening, so as to have the effect of fighting poison with poison. Its invention marks a breakthrough in the field of fasteners.

This method has been compiled into the chemical edition of the "Mechanical Design Manual", edited by Chen Daxian.