Осуществляющий индивидуальный привод к гусеницам

Дугообразное

Ex. 3.4. Look at the pictures at page 19 and tick (P) the characteristics of the excavators:

!	cable-operated	hydraulic	backhoe	front shovel	tracked	wheeled	blade-fitted
Model A
Model B
Model C
Model D
Model E

Ex. 3.5. Put each word in the correct blank to make sure you understand excavator mechanisms.

1) power shovels / steel ropes

________ make use of winches and ________ to perform digging of trenches, holes, and material handling.

2) undercarriage / house

The ________ is placed on top of a tracked or wheeled ________ .

3) slewing / central pin

The ________ allows ________ the house 360 degrees.

4) rotating platform / counterweight

The ________ has the operator cab, ________, engine, fuel and hydraulic oil tanks.

5) gearing / final drives

________ in the undercarriage have a ________ providing the drive to the individual tracks

6) boom / stick

Attached to the house is the ________ that is connected to the ________ with a bucket on its end.

Ex. 3.6. Describe excavator parts and their purposes using the table.

		a straight cutting edge
The mono boom		up to 180° independent to the house.
The knuckle boom	pivots	hardened side cutters and teeth.
The hinge boom	moves	used to break through hard ground.
The general purpose bucket	has	left and right in line with the excavator.
The large capacity bucket	is used	straight up and down.
		for cleanup or leveling where the material is soft.

Ex. 3.7. Choose the best ending for each sentence. Refer to the text if necessary.

1. The two main sections of an excavator are

a) the blade and the ripper.

b) the undercarriage and the house.

c) the hopper and the blade.

2. The operator’s cab is situated

a) on the undercarriage.

b) in the bucket.

c) on the house.

3. Winches and steel ropes are typical of

a) cable-operated excavators.

b) hydraulic excavators.

c) both cable-operated and hydraulic excavators.

4. Compact excavators are generally equipped with

a) triple-articulated booms.

b) hinge booms.

c) mono booms.

5. Excavators are classified into front shovels and backhoes according to

a) their bucket motion.

b) their bucket size.

c) the size of their hydraulic oil tanks.

6. The excavator can slew 360° due to

a) the counterweight.

b) the side cutters.

c) the center pin.

7. The digging force needed to pull the bucket through the ground is provided

a) by the stick.

b) by the boom.

c) by the track frame.

8. A bucket used to dig soft material

a) has no cutting edge.

b) has no teeth.

c) has hardened side cutters and teeth.

Date: 2016-03-03; view: 1255

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