Snow-proof external sun-shading system applied to Venlo type multi-span glass greenhouse

Abstract

The invention discloses a snow-proof external sun-shading system applied to a Venlo type multi-span glass greenhouse. An aluminum foil bubble curtain with a sun-shading rate of 70 percent is adopted, and moves along the direction of a ridge. Double-layer plastic-coated [PE / PET / PA (polyethylene / polyethylene terephthalate / polyamide)] steel wire ropes with supporting and windproof functions are adopted, and are fixedly arranged on a metal structural net rack on the roof of the greenhouse at transverse intervals of 30 to 100cm which are determined by the material of the curtain. The metal structural net rack is fixedly arranged on roof gutters, and is higher than roof glass. The aluminum foil bubble curtain for sun shading is driven to move by a pulling roller. The aluminum foil bubble curtain can be reeled under the transmission of the pulling roller according to the magnitude of snowfall on snowy days, snow on the curtain can be transmitted to the ground on the outer side of the greenhouse at a certain time interval, the snow bearing time of the curtain can be set in advance, and the curtain returns to the roof to continue bearing the snow, so that pressure of snow loads on the roof of the greenhouse is greatly reduced (by over 80 percent). The external sun-shading system has the functions of regulating the illuminance, reducing the temperature, preserving heat and reducing the influence of natural disasters such as hailstones and blizzards; the accumulated snow on the roof can be removed in a timing way, so that a lightweight material can be selected for the steel structural design of the greenhouse, and the construction cost is lowered.

Description

technical field [0001] The invention relates to an external shading system for a greenhouse, in particular to an external shading system with snow-proof function applied in a Venlo-type multi-span glass greenhouse Background technique [0002] The definition of a multi-span greenhouse is to connect two or more single-span greenhouses at the ridge, remove the side walls at the connection, and add gutters to form a multi-span greenhouse. The multi-span greenhouse has the advantages of saving land and building materials, high land utilization rate, large internal space, convenient mechanical operation and multi-layer three-dimensional cultivation, etc., and is being used more and more. [0003] The concept of Venlo-type greenhouse comes from the Netherlands. Its basic features are small surface, multi-span, top and surrounding covered with high light-transmitting thermal insulation materials. [0004] The greenhouse consists of the following main parts: greenhouse foundation, ...

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Problems solved by technology

[0006] In the past ten years, my country has introduced some Venlo greenhouses, but due to strong winds and heavy snow, some greenhouses have also suffered damage

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