Among the large-scale hollow blow molding machines in use, the conventional vertical hollow blow molding machines are the vast majority. Although this type of equipment has many advantages, it also has some shortcomings. For example, as the size of the product increases and becomes longer, the equipment will be higher and larger, correspondingly increasing the cost of the equipment. At the same time, the requirements for the melt strength of the plastic raw materials used will also be higher, because the melt strength of plastic raw materials is related to the relative molecular mass, and the increase of the relative molecular mass of plastic raw materials will increase the difficulty of processing. Molecular weight polyethylene materials will be difficult to guarantee the normal blow molding of ultra-long blow-molded products (length; above 3000mm), which will increase the production cost of the product and make it difficult to achieve market recognition of product costs. The equipment is too large, and many functions cannot be achieved when molding the product. For example, some industrial blow-molded products require inserts and prefabricated parts during molding, but the installation of inserts and prefabricated parts is extremely inconvenient due to the equipment being too large, which may cause unsafe accidents. This also increases the difficulty of designing and manufacturing the mold, and also increases the cost of the mold. In addition, tall equipment requires tall factories, which increases the investment of product manufacturers in the factories. Because of the production requirements of some ultra-long blow molded products and some special-shaped blow molded products, this has led to the development of large-scale horizontal hollow blow molding machines.
Horizontal hollow blow molding machines can often be used to make some products with special requirements. For example, products such as various special-shaped elbows for automobiles can be formed by horizontal mold clamping mechanisms. The energy saving effect of the horizontal mold clamping mechanism shown in the figure is relatively obvious. The main reason is that a small hydraulic cylinder is used to push the mold to open and close the mold. The short-stroke clamping hydraulic cylinder achieves high-pressure mold clamping. Because the hydraulic cylinder of short row rice requires less hydraulic oil, it is more energy-saving. The horizontal mold clamping mechanism is similar to a vertical hydraulic press, and the molds are horizontally installed on the upper and lower mold plates, respectively. The lower mold can be moved horizontally, and the upper mold can be moved up and down to achieve mold clamping.
The horizontal hollow blow molding machine can be provided with a single set or multiple sets of molds, a horizontal mold clamping mechanism arranged horizontally, a single-layer or multi-layer plastic head matched with it, and more than one plastic extruder. The plastic extruder is installed on the equipment rack and connected to the storage head. A plastic parison clamping and cutting device is installed at the lower part of the stocker head. Below it is a horizontal connection plate extending from the lower mold plate of the horizontal mold clamping mechanism for placing the lower mold. A horizontal mold clamping mechanism is installed on both sides or around the horizontal connection plate. A main hydraulic system, an electric control system, and a pneumatic system are arranged at the lower part of the equipment rack. A hydraulic servo system is installed on the rack near the storage head. According to the needs of the equipment, the equipment foundation pit can be designed under the horizontal mold clamping mechanism to reduce the height of the equipment above the horizon, which is convenient for workers to operate.
The centerline of the mold clamping mechanism of the horizontal hollow blow molding machine and the centerline of the plastic head are arranged horizontally perpendicular to each other. The difference from the ordinary vertical hydraulic machine is that it uses four Each corner is equipped with an energy-saving double-rod type hydraulic cylinder structure. One end of the outer cylinder sleeve of the double-rod hydraulic cylinder is fixed below the middle template. The middle template is fixed on the frame beam and cannot be moved. The upper mold of the mold is fixed at the lower part of the upper mold plate, and the lower mold is provided with a rolling wheel, which can be relatively moved horizontally on the guide rail arranged above the plate surface of the middle mold plate in the direction of the horizontal connection plate below the storage head. The position of the scroll wheel can be adjusted up and down, and the scroll wheel can be driven by hydraulic, electric or pneumatic. The upper and lower templates can be moved up and down by the energy-saving double-rod hydraulic cylinder, so that the mold can be opened and closed.
When manufacturing blow molded products, the lower mold of station No. 1 is moved horizontally in the direction of the upper part of the mold plate in the clamping mechanism (the product that requires the installation of prefabricated inserts can be placed with inserts at this time), the extruder During operation, the plastic parison is extruded from the storage head. When the parison is extruded to a certain size, the parison clamping device clamps the parison. At this time, the compressed air duct is installed through the compressed air duct installed in the middle of the storage head. The center of the parison is inflated so that the plastic parison does not stick together. The plastic parison is guided to be placed on one end of the lower mold by manual or mechanical methods, and the lower mold of the mold is moved horizontally to the middle template of the clamping mechanism. The parison is continuously extruded, and the lower die of the mold is moving at the corresponding speed. When the parison has a sufficient length, the parison clamping device clamps the parison again and cuts off the closed parison filled with air, using manual or The mechanical method places this end of the parison on the other end of the lower mold. When the lower mold moves to a position opposite to the upper mold, the upper and lower molds of the clamping mechanism are stable on the four double-rod hydraulic cylinders. Drive down and move down to close the mold. An energy-saving hydraulic cylinder for high-pressure mold clamping is fixed below the mold platen in the mold clamping mechanism. The high-pressure clamping hydraulic cylinder moves downward and presses on the flat baffle just translated to lock the upper and lower molds. The blow pin placed in the mold is used to insert the plastic parison that has been placed in the mold, and the interior of the mold is continuously filled with high-pressure air to ensure the blow molding of the product.
Because the pressure of the compressed air charged into the plastic parison is generally above 0.1 MPa; as long as the seal of the plastic parison is tight and free of air leakage, the situation of the plastic parison falling and sticking will not occur.
After the mold of the No. 1 station is closed, the die of the No. 2 station or other more stations repeats the work of the No. 1 station, so the cycle is repeated to achieve the purpose of rapid prototyping.
The molds on the 1st and 2nd or more tasks of the horizontal blow molding machine can be the same size and the same size, or can be installed separately on the 1st, 2nd, or other stations. Different specifications of molds can achieve the purpose of one device to produce more than two different specifications of products at the same time.
Because the mold of the horizontal hollow blow molding machine is installed horizontally, it can easily install the prefabricated inserts of the product: so it can meet the needs of producing special products, and it can also pull the plastic parison by manual or mechanical methods. Conveniently realize the production of shaped plastic blow molding products. In addition, because the mold is installed horizontally and is close to the storage head, the requirements for the melt strength of plastic raw materials are not too strict, and plastic materials of ordinary strength can be used.
Horizontal hollow blow molding machine can be installed with more than one or more plastic extruder and multi-layer storage head, the same plastic raw materials can be used in production, or different plastic raw materials can be used separately, according to different products It is required to adjust the formula of different plastic raw materials.
The new horizontal hollow blow molding machine has the following characteristics: relatively low manufacturing cost of the equipment; the melt strength of plastic raw materials is not high; many products that are inconvenient to be formed on a vertical hollow blow molding machine can be conveniently formed; The operation can make the product quickly shape and achieve a multi-specification production. The product has low manufacturing cost and significant energy saving. It can be widely used for blow molding of industrial plastic parts, automotive plastic parts, and plastic trays. As well as blow molding of super-long plastic containers, it is used for blow molding of many plastic products such as large, super-large and ultra-long water plastic supplies (plastic boats, plastic floating bodies, plastic floating tanks). Large-scale horizontal blow molding machines, especially multi-station horizontal blow molding machines, deserve the attention and development of domestic large-scale hollow blow molding machine equipment manufacturers. At present, domestic patents in this area have come out.