1. The selection of digging machine should firstly specify the size and depth of the digging hole diameter, followed by the size of the power used. Usually small power tractors dig small pits, high-power tractors dig large pits. At present, China's tractors are mostly small and medium-sized, which makes it difficult for users to dig large tree pits with small power or small tractors. Because the size of the power required for digging machines is extremely related to the digging hole diameter and the nature of the soil, according to the production practice, digging pits with a diameter of about 50 ft., in general sandy loam soil (specific resistance of 20-30 kPa), 18.4 kW is needed. The digging machine for wheeled tractors and the heavy soil (specific resistance of 40 to 50 kPa) require the use of a digging machine equipped with a tractor of about 36.7 kW. Therefore, it is unrealistic for the user to use a small-powered tractor equipped with a digging machine for digging large diameters. For this reason, only from the construction work process to do more articles, that is, using multiple excavation methods, such as the excavation of a hole diameter of 50? When the power machine power is not enough, you can use a 30-diameter drill bit to excavate, The power consumption is reduced by half. When the first pass is completed, the 50-inch diameter drill bit is used again, so that the purpose of using a small-powered tractor to excavate a larger diameter hole can be achieved. The disadvantage is that it takes a long time and consumes large amounts of power. At the same time, it also brings a lot of trouble to the operator. At present, the main manufacturers of digging machines are Nanchang Rotary Cultivator Factory in Jiangxi Province, Aksu Xinnong General Machinery Factory in Xinjiang Uygur Autonomous Region, Agricultural Machinery Research Institute in Ningxia Hui Autonomous Region, Sanyuan Hydraulic and Environmental Protection Machinery Co., Ltd. in Shandong Province, and China Agricultural Mechanization Science. Research institutes, etc., whose products are mostly digging machines for 22.0 to 55.1 kW tractors, and models for small gasoline engines, walking tractors or small four-wheel tractors are rare. During the pit digging operation, the hydraulic suspension device of the tractor shall be in a floating state so that the drill bit will be centered on the marking center of the pit to be digged and fall by its own weight. The power output shaft of the tractor will drive the drill bit into the soil through the transmission shaft and the decelerator; the drill bit cuts off the center portion. The soil, and then the blade at the lower end of the bit blade, cuts the soil. The cut soil is thrown against the wall of the hole by the centrifugal force and rises along the spiral blade to the ground under the action of the friction force and is scattered around the hole; After the depth, the hydraulic drill is used to lift the drill bit to the transport state to complete the digging process. 2. Why it is difficult to use hand-held digging machines to promote the use of seedlings in mountainous or hilly areas and hope to use portable digging machines. The domestic portable digging machine had products a few years ago, but there are still deficiencies in performance. In addition, there are few repair points and it has not been widely promoted. However, the more important reason is the price issue. For example, if a domestic machine is purchased for 2,500 yuan, and the foreign digging machine price is as high as 6,000 to 7,000 yuan, the input-output ratio of mechanized operation is out of balance, and satisfactory economic benefits cannot be obtained. For example, with a hand-held pit digger, the cost of digging a pit is not much different from the cost of manual digging, and it does not show the superiority of mechanized operations. In addition, when the hand-held digging machine is operated, the labor intensity of the digging and digging machine is larger than the manual digging, and the daily efficiency is only one hundred or two pits, so it cannot be promoted. If large and medium-sized tractors are used for digging machines (such as the pit digging machine supported by the Tie-55 tractor), digging pits with a diameter of 50 cm can dig between 500 and 1000 a day, and artificially digging only 10 to 20 a day. 100 times that of manual operation, 5,000 yuan of equipment can be used to recover costs after 5 days, which not only reduces labor intensity, improves work efficiency, but also improves economic benefits and can be accepted by the majority of users.
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