Bolts specifically refer to screws with larger diameters, and can also have no heads, such as stud bolts. Generally, it is not called a “stud bolt” but a “double stud”.

The most commonly used form of double-ended studs has threads at both ends and a polished rod in the middle.

The most typical use: anchor bolts, or places similar to anchor bolts, thick connections, when ordinary bolts cannot be achieved.

Application of stud bolts: used in the main body of large-scale equipment, which needs to install accessories, such as sight glasses, mechanical seal seat, reduction frame, etc., the stud bolt used at this time, one end is screwed into the main body, and the other after the accessories are installed With a nut on one end.

Because the accessories are often disassembled, when the main body and the accessories are directly connected by bolts, the main body threads will wear out or damage over time, and it is very convenient to use stud bolts to replace them.

In addition, when the thickness of the connecting body is very large and the length of the bolt is very long, stud bolts will be used.

The purpose of anti-loosening of stud bolt connection: In actual work, external load vibration, change, material high temperature creep, etc. will cause friction reduction.

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The positive pressure in the thread pair disappears at a certain moment and the friction force is zero, thus making the thread connection Loose, if repeated action, the threaded connection will loosen and fail.

Therefore, it is necessary to prevent loosening, otherwise it will affect normal work and cause accidents.

Preventive measures:

1.Use impregnating varnish that does not contain oxidizing components, such as epoxy urethane or unmodified epoxy-based impregnating varnish, and apply it on the surface of the stud bolt. Use paint that does not contain volatile acids. Use solvent-free paint as much as possible for vibration machinery.

2.When using melamine dipping varnish, the curing temperature and curing time should be adjusted.

The curing temperature should be slightly higher than 130℃ (such as 135℃) and the curing time should be longer than 180min, and it is necessary to strictly implement the process.

Especially in the hot and humid season, the rotary vibrating screen is based on the concept of rust prevention.

The regular paint drying (curing) time in the paint factory’s samples is not necessarily sufficient. The motor has a specific internal shape.

3.The anti-corrosion treatment of stainless steel surface refers to the use of various methods to apply a maintenance layer on the metal surface.

Its function is to isolate the metal from the corrosive environment to prevent the occurrence of the corrosion process or reduce the contact of the corrosive medium with the metal surface, and achieve the purpose of preventing or reducing corrosion.