Lifting column for sand irrigation

Abstract

According to the technical scheme, sand discharging and water draining holes are formed in circular hollow pipes between an upper sliding sealing ring and a lower sliding sealing ring, so that water enters a water draining cavity from the sand discharging and water draining holes in the circular hollow pipes in the process that the circular hollow pipes in all stages extend out under the action of water pressure; then the sand enters the sliding stroke cavities through a gap between the upper sliding sealing ring and the inner wall of the circular hollow pipe located on the outer side, under the action of water pressure, the sand deposited in the sliding stroke cavities at all levels is discharged out of the pressure adjusting holes, and a water draining and sand discharging channel which only goes out but does not go in is formed in the extending-out process of the circular hollow pipe, namely the sand discharging process of the pressure adjusting holes; and synchronous water pressure sand discharge is carried out in each stretching and retracting process of the telescopic column main body, so that deposition of sand grains in the sliding stroke cavity is effectively avoided, normal irrigation of the lifting column in a sand land is ensured, sand grains are prevented from entering, and meanwhile, the problems of air exchange and pressure regulation in the stretching and retracting process are solved.

Description

technical field [0001] The invention relates to a lifting column used in conjunction with a multifunctional irrigation and fertilization system for sandy soil irrigation. Background technique [0002] Agriculture is an important basic industry in China. When irrigating and fertilizing farmland, the traditional method is manual, which is time-consuming and labor-intensive, and has low efficiency. Using advanced facilities and technologies, it is China’s In the direction of agricultural development, there are also many irrigation and fertilization equipment on the market. However, due to structural problems, the equipment is expensive and has few functions. It is very inconvenient and the effect is unsatisfactory. Therefore, the applicant recently applied for a "multi-functional irrigation and fertilization system" with the application number "201320400678.X". It is composed of a rotating nozzle. The telescopic tube is a multi-section circular hollow tube with different diame...

AI Technical Summary

Problems solved by technology

[0002]Agriculture is an important basic industry in our country. The traditional method is to irrigate and fertilize the farmland manually, which is time-consuming and labor-intensive, and the efficiency is low; using advanced facilities and technologies, It is the direction of China's agricultural development to shift from the "depending on the sky" field production to large-scale automated production. There are also many irrigation and fertilization equipment on the market, but due to their structural problems, the cost of the equipment is high and the functions are few. It can freely go in and out of the ground and underground. After the equipment is arranged, it will affect other process operations. It is very inconvenient to use and the effect is not satisfactory. Therefore, the applicant has applied for a "multifunctional irrigation and fertilization system" with the application number "201320400678.X". The structure of the spraying mechanism is composed of a telescopic tube and a rotating nozzle mounted on the upper end of the telescopic tube. The telescopic tube is a circular hollow tube with multiple sections of different diameters. The previous section is compressed in the next section, and a seal is installed between each two sections. A telescopic sealing structure composed of rings; when in use, the telescopic pipe protrudes from the ground, and the water is transported from the telescopic pipe to the rotary nozzle, and then sprayed out from the rotary nozzle to achieve the purpose of irrigation. The applicant's online application number is: 201520209803.8" A kind of lifting column for multifunctional irrigation and fertilization system", and later applied for the "sealed lifting column" with the authorization announcement number CN 106068868 B, but in the process of use, especially when used in sandy land, For example, in Daxing County, Beijing, the land is mostly pure sand. After the lifting column is stretched out, the sand will adhere to the surface of each circular hollow tube. At the same time, sand and stones with smaller particle size will also enter the sliding stroke chambers at all levels from the surge tank, and cannot be discharged from the surge tank after sedimentation. Excluded, resulting in jamming during the lifting process of the lifting column, resulting in the failure of normal lifting. In the sandy environment, after lifting more than 3 times, more than 80% of the lifting columns cannot be fully retracted, and they cannot be fully extended. The lifting exceeds 10 After the second time, almost all lifting columns can't even reach 50% of the maximum extension height after they are fully extended, and they can't be fully retracted, which seriously affects the normal work

[0003] The applicant applied for a sand filter for lifting columns with application number 2020100161348 and a lifting column with sand filtering and sand scraping functions with application number 2020200296478 in 2019-2020. The top of the shaped hollow tube adds a sealing cap or filter cartridge, filter screen, etc. to filter sand to prevent sand particles from entering the sliding stroke cavity. After practical application, good technical results have indeed been achieved in the initial stage of use. Basically, each lifting column It can be fully retracted and there is no sand deposit, but due to the aging of the rubber, after about one year of use, the sand filtering or sand scraping effect will be significantly reduced, and the sealing cap or filter cartridge needs to be replaced. There are many lifting columns on site, and each lifting column All round hollow tubes without joints need to be replaced, which is difficult to replace, high in cost, time-consuming and labor-intensive, which greatly increases the use cost of this sealing cap. Lifting columns for irrigation looming

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