Original Title: [Experience Sharing] Picture and Text Explain 6-Step Tips, Teach You to Grind Drill Bit Easily, Practical Twist drill is a commonly used drilling tool with simple structure. It is very important to grind the drill bit well for the processing of workpieces, but it is not easy to really grind it well. The key is to master the methods and skills of sharpening. If you master the...

Original Title: New Progress in Key Technologies for Underground Metal Mining Underground metal mine mining is a systematic project, including development, development and mining (as shown in Figure 1, underground mine mining model), each link requires blasting. Therefore, how to blast safely and efficiently is a subject for every miner to study. Fig. 2 Underground mining mode At present, metal...

Original title: Drilling, reaming, reaming, boring, honing, broaching … Drill through the hole! ☞ This is Article 9972 posted by Metalworking (mw1950pub) Guided reading Hole is an important surface on box, bracket, sleeve, ring and disk parts, and it is also a surface often encountered in machining. In the case of the same requirements for machining accuracy and surface roughness, it is...

Original Title: Construction Method Sharing of Rotary Drilling Rig Roller Bit Drilling Rock-socketed Pile I. Characteristics of construction method 1. The machines and tools used in the construction method are compared with the original steel shot The machines and tools required for alloy drilling are basically the same, except that the rock breaking tool, the drill bit, is replaced and a...

Original Title: Carboxymethyl Chitosan, a film-forming, moisturizing and anti-pollution active ingredient CARBOXYMETHYL CHITOSAN is a polysaccharide derived from marine organisms. Its molecular structure is as follows: Beta-1-4-straight chain glucose derivatives Disordered geometric arrangement of diglucose molecular Effective hydrophilic groups: carboxyl, acetamido Effective anti-corrosion...

Originally published as Love 105 degrees of you ~ wait! Why 105 degrees? /Super Idol's smile is not as sweet as yours/ /The sun at noon in August is not as bright as you./ /You who love 105 ° C drop pure distilled water/ Have you heard the song "Love You at 105 ° C" recently? After listening to it, I found that its melody kept buzzing in my ears like a bee, lingering and playing in a...

Original Title: Nucleic Acid Extraction Grinder Easily Realizes Fine Grinding of Tissue Samples Nucleic acid extraction grinder is a powerful laboratory instrument and equipment, which is a common tool for laboratory sample preparation. Not only can be used for nucleic acid extraction and biological tissue cracking, but also can be used for RNA grinding extraction, protein grinding extraction,...

Original title: The knowledge of spray drying tower is here, working principle, operating procedures, fault repair! Source: Chemical 707 Main function: the material in solution state can be sprayed into the spray drying tower, and the material is discharged in solid powder state after drying. The pressure and flow of the feed liquid pump and the size of the spray hole can be adjusted according...