The structure of the core barrel is generally divided into single - acting double core tube and most of the fishing apparatus. The double tube section consists of an outer tube assembly and an inner tube assembly. The outer pipe assembly includes; The main structure and working principle of the cartridge stopper, cartridge chamber, stable joint outer pipe, diamond reamer and diamond bit are as follows:
(1) Spear structure is composed of spear head and recovery spring. When coring, the fishing device is lowered to the upper part of the inner tube assembly in the drill pipe, and the fishing hook grasps the fishing spear, lifts the fishing device up, picks up the recycling card barrel, and inwardly compressing the cartridge card, so that the inner tube assembly and the outer tube are separated, so that the inner tube assembly is lifted up.
(2) The clip structure is mainly composed of the clip frame, clip, spring and other components. Its function is that when the inner tube sits on the outer tube, the clip expands with the help of the elastic force of the expansion spring and sticks to the inner wall of the clip chamber, so that the drilling tool can achieve positioning.
(3) Buffer structure by spring, locking mother, split pin composition. Protecting the inner tube when pulling the core.
(4) Single action structure is realized by two pairs of thrust bearings.
(5) Adjust the length of the inner pipe assembly and the outer pipe assembly of the structure, and fine-tune the lower shaft and the locking mother to achieve the gap required by the end of the spring seat and the step inside the drill bit.
(6) The fishing structure, also known as the fishing device, is mainly composed of fishing hook, hammer and safety rope. The fishing hook is used to hold the spearhead while fishing the inner pipe, and the weight is used to speed up the fishing device's descent to save fishing time. The safety rope is a thin rope. When the inner pipe is stuck for some reason and cannot be lifted, the safety rope can be forcefully lifted and then the drill can be lifted.
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In order to protect the high quality and high yield of radish, according to the technical requirements of pollution-free vegetable production, the following fertilization techniques are proposed for the growth characteristics of radish and its fertilizer requirements:
1, the principle of fertilization: based on organic fertilizer, apply radish special fertilizer; based on the base fertilizer, skillfully applied top dressing.
2. Applying the base fertilizer is the main link of high quality and high yield of radish. The base fertilizer should be applied on the basis of 2500-3000kg of decomposed organic fertilizer per mu, and 40-55kg of special fertilizer for radish. It is required to spread the whole layer, and after the application, it will be turned into the soil and smashed into the ground. This will make the seedlings grow strong and the fleshy roots develop well. When applying the base fertilizer, it is not possible to use the unfertilized organic fertilizer to avoid damage to the root system of the seedling and affect the yield.
3, in the application of topdressing, should master the principle of light before weight. The first top dressing is to apply thin human excrement between the lines when the seedlings grow two true leaves. The second top dressing in the second time after the seedlings, when the radish roots "break the belly", apply 15-20kg of radish special fertilizer per acre. For small and medium-sized radishes with an annual growth period and short growth period, after 2 times of topdressing, the radish roots of the radish will rapidly expand and can no longer be topdressed. For large autumn and winter radishes, the growth period is long. When the radish is exposed or the shoulders are exposed, it is also necessary to apply a fertilizer, 10 kg of radish special fertilizer, which will have a significant increase in production.
Radish is a one-and two-year-old herb of the genus Brassica, one of the main vegetables of root vegetables. Radish has a large absorption of nitrogen, phosphorus and potassium. It is a high-yield crop with high fertilizer content. For every 4000kg of radish, about 8.5kg of nitrogen, 3.3kg of phosphorus pentoxide and 11.3 of potassium oxide should be absorbed from the soil. Kg, 3.84 kg of calcium oxide, the ratio is roughly 2.5:1:3.4:1.2.
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