WK-4型正鏟挖掘機 Forward Excavator

單斗正鏟機械式履帶行走電動挖掘機（簡稱電鏟）優點很多，適于高強度作業，廣泛應用于金屬、非金屬礦及煤炭露天礦的各種土質和軟硬礦巖的鏟裝作業，也可用于水利、建筑和修路等工程的鏟裝、排土和倒堆作業。具有以下特點：

Single-bucket forward mechanical crawler electro-excavators (“electro-excavator” for short) enjoy many advantages. They apply to high-intensity operation and are widely used in the scooping of various soil texture and soft and hard ore rocks of metal and nonmetallic ores as well as coal open-pit ores. They can also be used for the scooping and casting in water conservancy, construction and road building projects. They have the following characteristics:

1、正鏟挖掘時，動臂傾斜角度不變，斗柄和鏟斗作轉動和推壓運動，形成復雜的運動軌跡，滿足工作要求；

1. During forward excavation, the inclination angle of swing arm does not change. The bucket arm and bucket rotate and pushes the excavating objects. Complicated movement tracks are left to meet the requirements of work.

2、由于動臂和斗柄的布置和聯接的結構特點，決定了這種正鏟挖掘機不宜挖掘低于停機面以下的工作面，而適用于挖掘高出停機平面的工作面；

2. Due to the arrangement of swing arm and bucket arm as well as their linkage, such forward excavators are not suitable to excavate the working face under the level floor, but suitable to excavate working face above the level floor.

3、因其有足夠大的提升力和推壓力，并且是推壓強制運動，因此，它可用于各級土壤；特別適宜鏟裝爆后巖堆的散料。

3. Since such forward excavators have enough lifting power and pushing force and make forced pushing movement, they can be used for different levels of oil, and especially for the bulk materials of rock after scooping.

一、主要結構特點：

I. Main Structural Feature

1、采用單梁動臂雙斗柄齒條推壓式工作裝置，其主要組成部分有動臂、斗柄、鏟斗、提升機構和推壓機構；

1. They adopt single swing arm and double bucket arm device of gear pushing type. Their main parts are swing arm, bucket arm, bucket, lifting mechanism, and crowding mechanism.

2、回轉機構由兩臺立式電動機分別驅動，由于大齒輪固定在下機架上，小齒輪可以沿大齒輪周邊滾動，帶動整個回轉平臺作旋轉運動；

2. The slewing mechanism are respectively driven by two vertical motors. As the big gear wheel is fixed on the lower bearing bracket, the small gear wheel can roll around the big gear wheel to drive the rotation of the whole slewing platform.

3、采用履帶運行裝置，優點是接地比壓力小，附著力大，可適用于道路凹凸不平的場地，如淺灘、溝或有其他障礙物，具有一定的機動性，能通過陡坡和急轉彎而不需要太多時間。

3. They use crawler belt devices. Their advantages are small unit pressure of ground and large adhesive force. They can be used in rugged places such as shoal, ditch or other hurdles. They have certain motility. They can cross steep hill and sudden turns with much time spent on it.

4、操縱部分除電氣操縱外，還有壓氣操縱，即氣力操縱裝置。它是由專用的空壓機供給壓縮空氣，通過控制閥，使壓氣進入氣缸，驅動氣缸中的活塞，再由活塞桿通過杠桿機構來操縱各機構的離合器或制動器動作。

4. The control part includes not only electric control device, but also compressed air control device and pneumatic control device. They supply compressed air through special air compressor. They get the compressed air into the air cylinder through control valve, drive the piston in the air cylinder, and then the piston rod controls the operation of clutch or brake of each mechanism through lever mechanism

二、主要尺寸參數

II. Main Dimension Parameters