Excavator development history

The original excavator was manual. It has been in existence for more than 130 years since its invention. During the period, it has been fully automated from steam driven bucket rotary excavator to electric drive and internal combustion engine driven rotary excavator. The progressive developmen ---MORE---

This entry was posted in 201903 on

Electric water heater plugs should not be plugged in fr…

The electric water heater is a high-power electric appliance, the power is about 1500W, and the normal working current can reach 7.5A. Therefore, the installation of the electric water heater must use the socket that meets the requirements. The working current allowed by the socket must be gre ---MORE---

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Beijing **** good order of discharge can not be denied

It is a joy to set off fireworks and firecrackers during the Spring Festival. However, there are also many hidden safety hazards. In recent years, due to the frequent occurrence of safety accidents caused by fireworks and firecrackers, it is essential to take effective safety and protectio ---MORE---

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Rolling bearing code layout

Home>Bearing knowledge>Layout of rolling bearing code /*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Rolling bearing code layout Source: Bearing network time: 2013-02-27 /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089'; 1. The underlying code ---MORE---

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Instructions for using amine esters

Amine fresh ester (DA-6) is a high-energy plant growth regulator with broad-spectrum and breakthrough effects. It can increase the activity of plant peroxidase and nitrate reductase, increase the content of chlorophyll to accelerate the photosynthetic rate, promote the divisio ---MORE---

This entry was posted in 201903 on

Three stages of curing epoxy resin

1, liquid - operating time The operating time (also the working time or period of use) is part of the curing time. After mixing, the resin/curing agent mixture is still liquid and can work and fit the application. In order to ensure reliable bonding, all construction and positioning work shou ---MORE---

This entry was posted in 201903 on

Process technology for grinding the hole seat surface o…

Grinding technical requirements for the hole seat surface of the needle valve body The needle valve body is shown in Figure 1. Figure 1 needle valve body Among them, the main dimensional accuracy of the hole and seat surface is shown in Table 2. Table 2 Tolerance requirements for the hole and s ---MORE---

This entry was posted in 201903 on