1. " There you are — like a knife through butter,'said the demonstrator as the powered shovel swung back with its load.

2. Therefore, the investigation and discussion on power shovel main malfunction cause, diagnose method, maintainance operation is of great significance to improving power shovel efficiency.

3. In practice use W-4 power shovel often appears troubles, because walking system is frequently used.

4. Eventually a crawler was designed and constructed by the Marion Power Shovel Company.

5. A setting an amplitude-limiting circuit in SCR-D. G. drive system for bucket hoisting and lowering in power shovel has been designed.

6. I love working the soil , and got myself a power shovel, a truck, and a bobcat.

7. This article introduces the pollution effect factors of WJD-0.75 power shovel vehicle, and describes the pollution control and precaution measures.

8. A mathematic model has been derived according to the features of electric drive system of a power shovel.

9. This article analyses existing problem of electric power system of the movement transformer substation - power shovel of Huo coal group open coal mine and the theory of this system.

10. It is proposed in this paper that a relay regulating loop be added in the hoist current signal of large power shovel so that rational coordination between hoist and crowd capacities can be obtained.

11. The method of producing the teeth of bin in power shovel by vanishing mould casting and the method of operation of water toughening were presented.

12. A control circuit for transition control in DC motor field excitation on large power shovel has been designed.

13. An excitation control circuit tor direct current drive system of large power shovel has been designed.