Structure design, installation and status of roof tarpaulin

With the rapid development of my country's logistics industry, wing-opening vans are more and more favored by users because of their convenient and fast loading and unloading methods. At present, domestic wing-opening vans have adopted new materials and new processes in the shape and structure of the box, but the waterproofing of the top has always been a major problem for designers. Because the body of the van is movable, and its two wings are often opened, the waterproofness of the top of the van is required to be high. If it is not handled properly, rain leakage will occur at the hinged parts of the wing tops on both sides and at the junction of the side wings and the front and rear panels. According to the characteristics and requirements here, a new type of tarpaulin sealing structure is designed, which can effectively prevent water leakage at the top, and has a beautiful appearance and durability. The structural design of the tarpaulin is because the top tarpaulin is always in motion with the opening and closing of the side wings, and it is exposed to the wind and the sun for a long time, so the tarpaulin is required to have the corresponding tensile strength in addition to waterproof performance. and anti-aging ability. Therefore, a wear-resistant, waterproof and anti-aging high-strength fiber interlayer PVC coated cloth is designed. The main performance indicators of this cloth are: the tensile strength is 2500N/5cm in the warp direction and 2200N/5cm in the weft direction; Weft 373N; cold resistance is -30°, heat resistance is +70°, Light resistance of 7 to 8, peel strength of 90N/5cm, all of these performance indicators can meet the requirements of the top. The overall shape of the tarpaulin is“work”Font type, double layers are pasted together, and the sides are flanged and glued together to form a whole, which can increase the strength; the two ends are designed to be slightly wider than the middle, mainly to make the tarpaulin hang down to cover the joint parts of the side wings and the front and rear panels; the front and rear ends Head design with two triangular folded corners that stretch to 90°, distributed symmetrically from left to right. The purpose of this folding angle is to enable the hanging parts of the front and rear ends of the tarpaulin to unfold naturally during the lift of the wing top, and the ends of the tarpaulin will not be rolled up with the movement of the flanks. The color can be selected according to the color of the car body. Installation method The installation method of the tarpaulin is very important. Improper method will cause rain leakage and damage. Before installation, place a sponge block on the top frame, and paste the sponge block on the top frame with glue. The thickness of the sponge is about 5cm. The purpose of filling with sponge blocks is to prevent the tarpaulin from contacting the top frame and play a protective role. It can also make the top bulge to prevent water accumulation, so the role of the sponge is very important. Then cover the tarpaulin on the sponge block, glue the two sides to the wing tops on both sides, leave 50-80mm on both sides of the tarpaulin and the wing tops, and hang down by 150-200mm at the front and rear ends. The drooping part is at both ends of the tarpaulin.“work”The font part should be about 100mm wider than the top. After the tarpaulin is laid flat, press aluminum pressure strips on both sides of the tarpaulin, and use blind rivets to riveted the tarpaulin to the tops of the wings on both sides, and the front and rear ends hang down naturally; Sealant is applied to the riveted edge of the tarpaulin to prevent rainwater from infiltrating the joint. In the motion state, when the two wings are closed, the front and rear ends of the tarpaulin hang naturally as shown in Figure 2. At this time, the rainwater cannot enter the box from the front and rear ends; when the two wings are lifted, the front and rear ends of the tarpaulin follow. The side wings are lifted, the folds are unfolded naturally, the hinged part on the top can be folded naturally, and the middle part of the cloth is always kept hanging down when unfolded. When the wings on both sides land, the folds at the front and rear ends of the tarpaulin are naturally folded along with the landing of the side wings, and the hinged parts on the top are naturally unfolded. displayed status. During the entire movement of the tarpaulin as the wings are raised and lowered, the front and rear ends are not rolled up, and the top is not squeezed. External decoration After the tarpaulin is installed, the front and rear ends hang down and are exposed to the outside to affect the appearance, so a decorative cover is installed on the hanging parts of the front and rear ends. The decorative cover is made of stainless steel or aluminum alloy and is designed to“U”The belt is folded and bolted to the front and rear panels. Its purpose is to cover the tarpaulin, so that the hanging tarpaulin can hardly be seen when the side wings are closed, so that the appearance of the box body is more beautiful; it can also shield the wind during the driving process of the vehicle and prevent the wind from blowing the tarpaulin from the lower mouth. , to avoid the infiltration of rainwater from the lower part, and improve the rainproof performance. The tarpaulin and installation process designed and manufactured with this structure and material basically solves the technical problem of water leakage on the top of the wing-opening van. This installation process is stable and reliable, with a long service life, and can meet customer requirements. At present, the tarpaulin structures and materials used for the wing tops of various wing-opening van manufacturers are different, and there is no unified standard. The level of design and production has been further improved.

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