Greenhouse Intelligent Equipment Series - 18 greenhouse greenhouse insulation is discussed by Liu Wang 1, Ma Wei 2, Wang Xiu 2, Sun Guiqin 1, Shen Yi 1, Zhang Jingkai 1, Qin Gui 1, Li Zhiqiang 1 (1. Beijing Agricultural Machinery Test identification and promotion station 100079; 2. Beijing Agricultural Intelligent Equipment Technology Research Center, 100097) lap joints should ensure no air leakage, strong and firm, the amount of lap joint is not less than 50mm. If lap joints are used, the grommets used for metal rivets should be made Anti-pound treatment, riveting should be firm, smooth and smooth. The grommets of the corresponding quilt should be less than 10mm. The quilting type insulation should be smashed and the page should be glued. It is required to have good adhesion performance and should effectively prevent water leakage. The running line should be neat, and there are no serious jumpers and twists and turns. The surface of the heat preservation is clean and smooth, and scratching and drawing are not allowed. The bonding and sewing are uniform, and there is no possibility of foaming with an area larger than 100 cm2.
The greenhouse insulation currently used is a waterproof insulation, heat preservation, heat insulation, etc., which is made by quilting or bonding, and is mainly used for agricultural thermal insulation of solar temperature outdoor cover insulation (see). Compared with the straw curtains (or grasshoppers) still in use today, the heat preservation is lighter than the straw curtains while ensuring the heat preservation effect, and is easy to be mechanically wound. The surface is smooth and does not puncture and contaminate the plastic film, and is waterproof and durable. Development of such insulation technical requirements, test methods and inspection rules are for the specification of insulation was used to ensure the safety of winter crops is important. This paper refers to the existing relevant standards, and proposes that the shed insulation is required by technical conditions for discussion.
Test Methods Breaking Strength and Elongation at Elongation Samples were prepared on a sample preparation. One group was a warp or longitudinal specimen and the other was a weft or transverse specimen. Each sample shall be protected by at least 3 specimens. The specimen shall be representative. The wrinkles and defects shall be avoided. The specimen shall be at least 150 mm away from the edge of the fabric to ensure that the specimen is evenly distributed on the specimen. Sample size: Each sample is required to have an effective width of 50 mm (excluding burrs) and its length should be no less than 260 mm. The sampling is as shown.
The sample shall be prepared with the same sample, and the sample size shall meet the test requirements. The sample shall be flat and free of wrinkles. Quilting insulation is required to pass the sample center. The technical standards mainly referred to in this paper are: GB/T3921 tensile properties of textile fabrics> (Part 1: Determination of breaking strength and elongation at break); GB/T4669 woven fabric per unit length mass and mass per unit area>; <GB/T 4744 textile fabric water resistance test hydrostatic test; <NY/T 1831-2009 greenhouse cover material insulation performance determination method.
The technical requirements mainly include two parts: performance indicators and general technical requirements: the performance indicators mainly have five standards, which relate to the physical performance parameters of the insulation. Heat transfer coefficient carry 1.70Wm2.K); 77.3 .; heat resistance to water saving 4H; quilted fabric hydrostatic type insulation is 10 kPa (adhesively foam insulation material is metal, the fabric does not involve water conditions); incubation is normal life: roll shop after 1200, there should be no damage, rolling carpets, cracks and other phenomena.
General technical requirements to prepare a sample of the insulation structure should meet the technical requirements of products, manufactured in accordance with prescribed procedures approved product design and technical documents.
Use fabric is heat resistant, good aging properties of the material. Insulation fabric breaking strength: warp direction 1000N, weft direction 600N; elongation at break: warp direction 矣 25., weft direction 矣 30 °%. Insulation fabric can be seen in the physical object shown.
2 crossing the suture, gumming treatment is carried out in accordance with regulations.
The main instruments and equipment used for the test equipment and equipment shall be qualified and affixed with the inspection certificate. The cotton felt used for the insulation material shall be needle felt. It is strictly forbidden to use acrylic fiber, space cotton and other materials; Closed-hole foam materials should be used for insulation materials.
The insulation width and unit area quality should meet the requirements of the product. Quilted insulation sign. The measurement range and accuracy can be guaranteed. There are no specific requirements for the measuring instrument, and the parameters can be satisfied in Table 1.
Table 1 Main measurement parameters Accuracy No. Measurement parameters Measurement range Accuracy Requirements Length Time Quality Temperature force measurement method Unit area quality: The quality of the insulation is measured by an electronic scale, and the actual area of ​​the insulation is measured, and the mass per unit area is calculated.
The insulation is measured by the mass, width and length of the structure, and the mass per unit area is calculated according to formula (1).
m insulation is the structural quality, unit: g; - insulation length, unit: m; insulation thickness: the insulation is placed on the plate, with a mass of 10kg ± 1kg, the bottom plane is (150 x 150) mm square box Placed on the heat preservation quilt, measure the thickness after the heat preservation is compacted, and measure the length direction evenly at 3 places, and take the average value.
Insulation fabric breaking strength and elongation at break: Two sets of samples were cut from the insulation fabric samples, one set was a warp or longitudinal specimen, and the other set was a weft or transverse specimen. Each group of samples shall include at least 3 samples. The sample shall be representative. The wrinkles and defects shall be avoided. The sample shall be at least 150 mm away from the edge of the cloth to ensure that the sample is evenly distributed on the sample. The effective width of each sample excluding the burrs shall be 50mm, and the length shall be not less than 260mm. The measurement method shall be carried out in accordance with the provisions of GB/T3923.1.
The 4744 standard is required.
Water resistance: The measurement method is that the four corners of the 1.0 mx1.0 m sample are clamped on the same horizontal surface, and the sample is formed into a dish shape, and 2000 mL of water is uniformly added. After 4 hours, the sample is observed for water seepage. If water seepage occurs, the water resistance is unqualified.
Heat transfer coefficient, heat saving rate: Make one piece of the same structure as the heat preservation structure. The sample size should meet the test requirements, and the sample is flat and has no wrinkles. Quilted insulation is required to have two intersecting seams through the center of the specimen and to be glued as specified. The measurement method was carried out in accordance with the NY/T1831-2009 standard.
The appearance of the sample to be tested is normal service life: according to the single width and the length of the insulation of not less than 6m, the total length of the insulation is rolled up 1200 times, and it is observed whether the insulation is damaged by the outer surface, whether the internal insulation material has a felt, crack, etc. A phenomenon that affects the thermal insulation performance. The appearance of the sample is as shown. In addition, the quality of the roller blind machine and the quality of the reel should be considered. The above factors will affect the actual use effect and life of the thermal insulation.
Inspection rules Unqualified items Classification test items are classified into Class A unqualified, Class B unqualified, and Class C unqualified according to their influence on product quality.
Table 2 Unqualified items Classification category Item name Anti-seepage water quilting insulation fabric Hydrostatic pressure heat transfer coefficient Thermal saving rate Service life Insulation Thickness Insulation Material Fabric Breaking Strength Lap and Riveting Quality Gluing Quality Unit The quality of the area is insulated by the width of the buttonhole. The quality of the insulation is determined by the principle of determining the elongation at break of the surface quality fabric. The quality of the product is related to the safe wintering of greenhouse cultivation in winter. The standard processes and procedures for inspection are subject to item-by-item assessment and class-by-category. The sampling plan and judgment are shown in Table 3. When the number of non-conformities in the sample is less than the number of unqualified judgments, it is rated as qualified, and if it is greater than or equal to the number of unqualified judgments, it is rated as unqualified. All types of qualified time are finally rated as qualified; if any category is unqualified, they are finally rated as unqualified.
Table 3 Sampling plan unqualified classification number of items number of items inspection level sample code qualified quality level (AQL) qualified judgment number Ac unqualified judgment number Re fruit vegetable industry technology system Beijing innovation team support
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