A V-shaped tree pit digging machine drill bit

Abstract

The invention discloses a drill of a V-shaped tree pit digging machine. The drill consists of a power transmission and digging device, a hydraulic gradual expanding support device and a spiral earth guide device. Compared with the prior art, the drill provided by the invention has the advantages that (1) V-shaped tree pits can be dug by the drill of the V-shaped tree pit digging machine, designed in the invention, energy resource is saved, and the use range of a traditional drill with a fixed diameter is enlarged; (2) the hydraulic gradual expanding support device comprising a hydraulic cylinder barrel, a piston rod, a fixing shaft sleeve and the like is adopted in the invention to realize the real-time and flexible variable diameter operation of the drill of the digging machine, the diameter variation mode is accurate and reliable, and the variation range of an opening angle is large; (3) the V-shaped tree pits dug by the drill of the V-shaped tree pit digging machine cannot easily collapse under the action of external disturbance, and the shapes of the pits can be well kept; and (4) trees with inverted conic native earth are more conveniently transplanted in the V-shaped planting tree pits dug by the drill than in U-shaped tree pits and more easily survive in the V-shaped tree pits after transplanting.

Description

technical field [0001] The invention relates to a tree planting hole digging machine drill bit, in particular to a V-shaped tree pit digging machine drill bit, which belongs to the field of garden planting machinery. Background technique [0002] The pit digger is a pit digging and drilling machine widely used in gardening, planting, piling and other fields. Its general working method is: the power output interface drives the transmission shaft to rotate, the gearbox turns to drive the drill bit to rotate, and the helical blade of the drill bit drives the sand Flip out upwards to complete the digging operation process. [0003] The drilling tool is the key and basic working part of the excavator. Common small or medium and large digging machines use fixed-diameter drills with helical blades, which can dig U-shaped tree pits. They have the advantages of simple structure, low cost, easy operation, and long life. [0004] However, the fixed-diameter drill bit also has the fol...

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Problems solved by technology

[0004] However, the fixed-diameter drill bit also has the following disadvantages: (1) When it is used for transplanting medium and large trees, since the root system of this kind of transplanted wood has an inverted cone-shaped "grandmother soil", in order to facilitate planting, it must be maximized. The drill bit is selected to make the diameter of the tree pit dug meet the maximum diameter of its "grandmother's soil", which increases the amount of earthwork virtually and wastes resources; (2) the U-shaped tree pit dug by a fixed-diameter drill bit has a vertical The inner facade is more likely to collapse due to external disturbances, and the result will inevitably shrink the size of the tree pit dug and affect the quality of the pit; (3) The diameter of the tree pit often determines the air permeability of the loose soil above the roots of the trees planted after backfilling. For the U-shaped tree pit dug out by a fixed-diameter drill bit, the diameter of the loose soil above the root system of the planted tree is fixed. In order to make it easier for the tree to survive, only a larger diameter can be selected, which will increase the size of the tree invisibly. Quantity

[0005] The problems of the above-mentioned fixed-diameter drill bit limit the scope of use of this type of garden machine to a certain extent, so it is urgent to design a digging machine drill bit that can change the diameter of the digging hole flexibly in real time and can dig out a V-shaped tree pit.

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