Multilayer heat insulation plastic steel greenhouse

Abstract

The invention relates to a multilayer heat insulation plastic steel greenhouse, which is characterized in that a steel purlin is defined into an arch shape to form a single arch-shaped steel purlin, the two ends of the single arch-shaped steel purlin are connected onto a base, a plurality of single arch-shaped steel purlins are ranged in parallel at intervals and are respectively and fixedly arranged on transverse steel purlins, the single arch-shaped steel purlins are fixedly arranged on one or a plurality of transverse steel purlins to form an outer steel purlin framework, a plastic film or tarpaulin covers the outer steel purlin framework, a layer of arch-shaped steel purlin frame is at least arranged in the single arch-shaped steel purlin, a plastic sectional material is arranged on each layer of arch-shaped steel purlin frame to form a steel purlin slideway, and each single arch-shaped steel purlin is fixedly connected with the corresponding steel purlin slideway at intervals by a plurality of support frames. The multilayer heat insulation plastic steel greenhouse has the advantages that the structure is reasonable, the framework is firm, the layered covering closing is adopted, the film pulling and closing are convenient, films can be pulled out for sunlight transmission, the films are closed at night for heat insulation, light transmission, ventilation and heat insulation are integrated, the multilayer films are pulled for covering, each layer of film can be automatically opened or closed, the light-transmission and heat insulation planting or cultivation greenhouse is formed, the sunlight absorption and temperature maintaining effects and the harvesting of the greenhouse are improved, and the multilayer heat insulation plastic steel greenhouse is applicable to arch greenhouses, winter warm greenhouses and other greenhouses, and belongs to an ideal special device for a layered closing structure of the planting and cultivation greenhouses.

Description

technical field [0001] The invention relates to special-purpose greenhouse technology, more specifically, a multi-layer thermal insulation plastic-steel greenhouse with a layered plastic greenhouse membrane structure used in industries such as agricultural planting and fish farming. Background technique [0002] Existing breeding or planting greenhouses are basically divided into two types: one is an arched shed; the other is a winter warm shed. Most of the above-mentioned greenhouses have a one-layer membrane structure, and there are also two-layer membrane structures. The structure is fixed and single, and the thermal insulation performance is poor. [0003] The basic structure of the arch shed is an arched skeleton made of cement, iron pipes, bamboo stalks, bamboo poles and other materials covered with plastic film. This kind of greenhouse has simple structure, fast heat dissipation and poor heat preservation effect. Using this kind of shed to grow vegetables or breed s...

AI Technical Summary

Problems solved by technology

Once the temperature drops below zero in winter, this kind of shed cannot meet the growth requirements of vegetables, sambal fish and shrimp, and it will basically stop using if no other temperature-raising measures are added.

[0004] The basic structure of the winter warm shed is as follows: one side is a film covering surface, and the other side is an insulating wall. Usually, the insulating wall is north or north plus east and west; With straw curtains or insulation quilts on the outside, the insulation effect of this kind of vegetable greenhouse is better than that of arched sheds. In winter, when the outdoor ambient temperature reaches minus 4-8°C at night, the temperature inside the shed can only be kept at 3-5°C above zero. ℃, can only keep vegetables from being damaged by freezing; in cold winter, when the nighttime temperature is as low as minus 10 ℃, it cannot resist the invasion of cold air outside the shed

In order to increase the temperature in the shed at night, there are ways to increase the temperature of the shed, or use fire to heat it, or set up a small shed in the shed, etc., which not only wastes energy, but also increases unsafe hidden dangers, and all of them are inconvenient to operate. Due to problems such as increased cost and poor thermal insulation effect, the existing greenhouses cannot meet the production needs of crops and aquaculture, and the necessary conditions for promoting growth

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