Design of bolt pre-twisting mold

1 Qinghai Institute of Engineering Machinery Xining 810017 Wang Pengkui prepared for the situation, to be hot on the 60014 up-type friction press. Because the part is a high-strength material, the number of each piece is large, and the die structure should be designed as a pre-stressed die. Aft

Agricultural fertilizers to remove pests

There are many pests in farmyard manure, such as cockroaches and worms. If they are not treated or handled improperly, the pests will multiply and will harm the crops after application.

The chicken and duck manure are flattened, dried and simmered, and 1 kg of octyl su

How to deal with black spots in the viewfinder

[ Huaqiang Security Network News ]

There are black spots in the viewfinder. I believe that many photographers will encounter it. Even if it does not affect the shooting effect, it still affects the shooting mood. How do the v

What features do you know about Gigabit PoE switches?

With the continuous expansion of the application of network cameras, the application of intelligent data communications equipment such as POE switches is also growing. A Gigabit PoE switch is a switch that can provide the PD device with a network or can provide power to the PD device through a