Design solutions for fastening bolts of explosion-proof cabinet housings

Design solutions for fastening bolts of explosion-proof cabinet housings

Explosion-proof cabinet shell from the bolt strength cast aluminum shell threaded tooth strength, bolt preload torque calculation, bolt loosening, and precision design.

1. Strength: the selection of appropriate strength fasteners to ensure that the shell to withstand the explosion pressure so that it does not fall off;.

2. Blind holes: bolts without washers screwed into the shell wall blind holes, the bottom of the hole should be retained at least one buckle of margin;.

3. Protection: with spring washers, flat washers, countersunk holes, and other ways to protect the fasteners;

4. Torquerque: tightenTorquerque should be specified in the document, and the installation is by the specified value;

5. Explosion-proof appliances in the selection of bolt precautions

(1) Material: Explosion-proof electrical bolts should usually be made of stainless steel or nickel-based alloys with high strength and corrosion resistance.

(2)Thread: Explosion-proof electrical bolts should be threaded to match the design requirements of the explosion-proof electrical appliances to facilitate the correct installation and disassembly.

(3) Strength grade: the strength grade of the explosion-proof electrical bolts should meet the requirements of the design specifications.

(4) Anti-loosening design: explosion-proof electrical bolts in the installation need to pay attention to whether need to be equipped with anti-loosening pads, shims, and other accessories to ensure that the bolts will not loosen in the process of use.

(5) Installation torque: Explosion-proof electrical bolts must be installed according to tightening requirements, not over-tightening or loosening requirements.

6. Material requirements: Plastic and light alloy materials are not allowed.

7. Other requirements:

(1) Doors or covers fixed with threads shall be additionally fixed with the help of hexagon socket set screws or equivalent; (2) Double-head screws shall be fixed securely, with fusion welding or riveting or other equivalent methods.

(2) Double-head screws shall be securely fastened, permanently fastened to the enclosure by fusion welding or riveting or other equivalent means;

(3) Fasteners should not penetrate the wall of the explosion-proof shell unless the wall of the shell constitutes a combination of explosion-proof surfaces and the shell can not be separated

(4) When bolts without washers are fully screwed into blind holes in the wall of the explosion-proof enclosure, the bottom of the holes shall maintain at least one total thread allowance;

(5) For screw holes or double-headed bolts that do not penetrate the wall of the explosion-protected enclosure, the remaining thickness of the wall of the explosion-protected enclosure shall be at least 1/3 of the diameter of the bolt or double-headed bolt, with a minimum of 3 mm.

There are generally two types of explosion-proof enclosures: flat and stop. For the plane structure, the bolt plays a fastening role and ensures plane clearance. For stop structure, when the explosion-proof surface only considers the cylinder part, the bolt only plays a fastening role while ensuring that the plane part is of the gap. When tapping threads directly on the shell should be noted that the fastener screw holes try not to pass through the shell of the explosion-proof, through the shell when the bottom of the screw holes should be left more than a 3mm margin, in the use of aluminum alloys and other light alloy materials to do the shell of the explosion-proof, due to the aluminum alloy strength is low, so it is necessary to often open (such as the replacement of the light source needs to be opened) of the shell of the explosion-proof fastening screws should not be used in the aluminum alloy shell of the direct tapping threads with the By pre-buried anti-loosening internal and external threaded steel sleeve to increase the strength of the screw hole and prevent failure due to thread rot. Do not re-user replacement of light or maintenance when open and factory has been installed on the bolt, can be tapped directly on the shell fastening screw holes, but can not use fine threads, try to use coarse threads, and there are enough engagement buttons to meet the fastening requirements. For high-quality screws fasteners and professional technical support, don't hesitate to contact us at adelajonly@gmail.com or visit our website at [Juxin Fasteners]: https://www.juxinfasteners.com.

In short, in the design of the shell fasteners, the first choice is to distinguish the role of the explosion-proof shell. Does it only play a role in fastening, or does it both play a role in fastening and also play a role in ensuring the plane clearance? Then, confirm the maximum axial load of the bolt to select the appropriate bolt.