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耙齿式破冻土机以耙齿为工作部件,它是一个耙齿形的曲面楔子。当破冻土机被拖拉机牵引前进时,耙齿以一定的入土角楔入冻土层,先挤压冻土,至一定限度时,冻土即开裂破碎,呈碎块松散拱起。冻土层是有层次的,耙齿式破冻土机就是沿着冻层厚度分层向前连续凿切,这样冻土易于破裂撬碎。它一般配合推土机、铲运机或人工推集清理,实行联合作业。耙齿式破冻土机结构简单,制造容易;同东方红—75拖拉机配套,一次破冻土厚度可达一尺左右,每小时可破冻土150～200米~3,可代替近二百个人工;使用成本比爆破破冻可降低30～50%。耙齿式破冻土机有牵引式和悬挂式两种基本型式。牵引式结构较复杂,要有沉重的机架和行走装置,耗用金属量较多,机组机动性和通过性较差。悬挂式结构简单,机身轻而短,机组机动性和通过性较好,可改善拖拉机的附着性能。因此,目前悬挂式的耙齿破冻土机居多。为了提高机组作业的稳定性,在一些大型拖拉机上也有采用半悬挂式结构的。悬挂式耙齿破冻土机,根据悬挂杆件同拖拉机的连接型式可分为二点、三点和四点三种悬挂结构。二、三点悬挂结构,是指破冻土机
Rake tooth freezing machine with rake tooth as working parts, it is a rake tooth-shaped surface wedges. When the frost heave machine is towed by the tractor, the rake teeth are wedged into the permafrost layer with a certain angle of penetration, and the permafrost is squeezed first. When reaching a certain limit, the permafrost cracks and is crushed, and pieces are loosely arched. Frozen soil layer is a level, rake tangential freezing machine is along the frozen layer thickness continuous cutting forward chipping, so that the frozen soil is easy to crack broken. It generally with bulldozers, scrapers or artificial push-to-clean, the implementation of joint operations. Rake tooth freezing machine is simple in structure and easy in manufacture. It is matched with Dongfanghong-75 tractor. The thickness of once frozen soil can reach about one foot and the permafrost can be 150-200 meters per hour. It can replace nearly 200 A labor; the cost of blasting can reduce blasting than 30 to 50%. Rake tooth freezing machine has two basic types of traction and hanging. Traction structure is more complex, there must be heavy rack and walking devices, consume more metal, the unit mobility and poor passability. Suspension structure is simple, light and short fuselage, the maneuverability of the unit and through the better, can improve tractor attachment performance. Therefore, the current hanging rake freezing machine is mostly. In order to improve the stability of the unit operation, in some large tractors are also used semi-suspended structure. Hanging rake teeth frozen soil machine, according to the type of suspension rod with tractor connection can be divided into two, three and four three kinds of suspension structure. Second, three-point suspension structure, refers to the frozen earth machine