How to solve abnormal motor start

How to solve abnormal motor start

When an HBT60A concrete pump stops and starts again after pumping, the motor cannot start. It sounds as if the power is insufficient. At the same time, the AC relay of the star-connected motor power supply "snaps" and snaps. At first, it is suspected that the power supply voltage is insufficient or the phase is small. After inspection, the three-phase voltages are very stable. When we replace the AC relay, the relay no longer beats, but the motor starting sound is still abnormal. After the motor power supply is converted into triangular connection, the motor starting sound returns to normal, but the pressure in the main oil circuit of the machine remains high, while the pumping operation is normal. After stopping pumping, the pressure in the main oil circuit is still

09

2019

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10

Level of motor protection

Level of motor protection

The motor protection level is expressed by IPXX. The first number after IPXX indicates dustproof, and the numbers are 0, 1, 2, 3, 4, and 5. The larger the number, the higher the dustproof level. The second number indicates waterproof, the numbers are 0, 1, 2, 3, 4, 5, 6, 7, 8, the larger the number, the higher the waterproof level.

09

2019

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10

Five cases of electric hoist need to stop operation

Five cases of electric hoist need to stop operation

1. Overload or unclear weight of objects, such as lifting and pulling up buried straight objects with unclear weight or tension, and oblique pull and oblique crane, etc.; 2. Defects or damages of structures or parts that affect safe work, such as brake safety device failure, hook and nut anti-loosening device damage, wire rope damage reaching scrap standard, etc.; 3. The binding and hanging are not firm or unbalanced and may slide, and the corners of heavy objects are not padded with wire rope; 4. There are people or floating objects on the suspended object; 5. The work site is dark, and it is impossible to see the site, the situation of the suspended object and the command signal.

09

2019

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10

Causes of electrical system failure

Causes of electrical system failure

Because the crane in the normal operation, the resistance group in the resistance box is put into operation most of the time, which generates a lot of heat, so that the temperature of the resistance group is higher. In a high temperature environment, both the resistor itself and the resistor connection terminal are susceptible to deterioration. At the same time, the switching frequency of various AC contactors in the working process of bridge cranes is particularly high,

08

2019

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10

Western Development "the belt and road initiative" Strongly Implement Unlimited Business Opportunities in Construction Machinery Industry

Western Development "the belt and road initiative" Strongly Implement Unlimited Business Opportunities in Construction Machinery Industry

With the in-depth promotion of the "Western Development" and the strong implementation of the "Belt and Road", many benefits such as infrastructure construction, energy and resource development, and logistics channels are coming, and the construction machinery industry in western my country is about to enter the "fast lane" of development ". As an important gateway city to enter the west, Chongqing is also a bridgehead for construction machinery companies to advance westward. It is working hard to build a Hailing International Construction Machinery Trading Center to fill the gap that there is no large-scale construction machinery professional trading center in the western region. Railway infrastructure power full economic development, transportation must go first, "western development" strategy continues to bring to the railway infrastructure industry.

11

2018

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11

The Development and Reform Commission approved 8 new infrastructure projects with a total investment of more than 90 billion.

The Development and Reform Commission approved 8 new infrastructure projects with a total investment of more than 90 billion.

On October 15, the national development and Reform Commission announced eight newly approved infrastructure projects, including five highway projects, two railway projects and one waterway improvement project, with a total investment of 95.316 billion billion yuan. Since October, the National Development and Reform Commission has approved a total investment of more than 365.3 billion yuan in infrastructure projects.

06

2015

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10

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