What are the types of fasteners for explosion-proof lights and explosion-proof boxes?

Speaking of explosion-proof in recent years, everyone knows that explosion-proof lamps, explosion-proof distribution boxes and other explosion-proof electrical appliances are really developing rapidly, using various flammable, explosive, chemical and other hazardous locations!

So what do you know about the fasteners of explosion-proof lamps and explosion-proof distribution boxes? How many categories are they divided into? The following editor will give you a brief introduction! ,

Fasteners usually include the following 12 types of parts

Bolt: A type of fastener consisting of a head and a screw (cylinder with external thread). It needs to be matched with a nut to fasten and connect two parts with through holes. This type of connection is called bolt connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection is a detachable connection.

Stud: There is no head, only a type of fastener with threads on both ends. When connecting, one end of it must be screwed into the part with internal threaded hole, the other end must pass through the part with through hole, and then the nut is screwed on, even if the two parts are tightly connected as a whole. This type of connection is called a stud connection, which is also a detachable connection. It is mainly used where one of the connected parts has a large thickness, requires a compact structure, or is not suitable for bolt connection due to frequent disassembly.

Screws: It is also a type of fasteners composed of two parts, a head and a screw, which can be divided into three categories according to their use: machine screws, set screws and special purpose screws. Machine screws are mainly used for a tightening connection between a part with a threaded hole and a part with a through hole, without the need for nut cooperation (this type of connection is called a screw connection, which is also a detachable connection; it can also be It is matched with a nut and is used for the fastening connection between two parts with through holes.) The set screw is mainly used to fix the relative position between the two parts. Special purpose screws such as eyebolts are used for lifting parts.

Nut: with internal threaded hole, the shape is generally flat hexagonal column, there are also flat square column or flat cylinder, with bolts, studs or machine screws, used to fasten the connection of two parts, making it into One piece whole.

Self-tapping screws: similar to machine screws, but the thread on the screw is a special self-tapping screw thread. It is used to fasten and connect two thin metal components into one piece. Small holes need to be made in the component in advance. Because this kind of screw has high hardness, it can be directly screwed into the hole of the component. Form a responsive internal thread

Wood screw: It is also similar to machine screws, but the thread on the screw is a special wood screw thread, which can be directly screwed into the wooden component (or part) to connect a metal (or non-metal) part with a through hole with A wooden component is firmly connected together. This connection is also a detachable connection.

Washer: A type of fastener with an oblate ring shape. It is placed between the supporting surface of bolts, screws or nuts and the surface of the connected parts, which increases the contact surface area of the connected parts, reduces the pressure per unit area and protects the surface of the connected parts from damage; another type of elastic washer, It can also play a role in preventing the nut from loosening.

Retaining ring: It is installed in the shaft groove or shaft hole groove of the machine and equipment, and plays the role of preventing the parts on the shaft or hole from moving left and right.

Pins: Mainly used for positioning the left and right parts, and some can also be used for connecting parts, fixing parts, transmitting power, or f

Rivet: A type of fastener composed of two parts, a head and a nail shaft, used to fasten and connect two parts (or components) with holes to make them into a whole. This type of connection is called rivet connection, or riveting for short. It is a non-detachable link. Because if the two parts connected together are separated, the rivets on the parts must be broken.

Assembly and connection pair: Assemblies are a kind of fasteners supplied in combination, such as a combination of machine screws (or bolts, self-supplied screws) and flat washers (or spring washers, lock washers); A type of fasteners supplied by a combination of special bolts, nuts and washers, such as high-strength large hexagon head bolt connections for steel structures.

Welding nails: heterogeneous fasteners composed of nail rods and nail heads (or no nail heads), which are fixedly connected to a part (or component) by welding so as to be connected with other parts.