Fully-automatic molding machines for pulp molding and intermittent drainage vacuum devices thereof

Abstract

The invention discloses fully-automatic molding machines for pulp molding and intermittent drainage vacuum devices thereof and comprises a plurality of molding machines for pulp molding and a plurality of intermittent drainage vacuum devices. The molding machines for pulp molding are fully-automatic molding machines for pulp molding, and the intermittent drainage vacuum devices are middle gas-water separation double-tank intermittent drainage vacuum devices; the positive and negative pressure pipes of the plurality of fully-automatic molding machines for pulp molding are provided with vacuum pipes which are connected with large-diameter horizontal pipes, the outlets of the large-diameter horizontal pipes are connected with gas-water separation large-diameter pipes in the middle to allow the plain boiled water to return to the middle gas-water separation large-diameter pipes in the molding vacuum pipes, gas-water separation is performed in the pipes, and the plain boiled water flows into water drainage tanks directly to allow a negative pressure storage tank to keep maximum gas storage capacity all the time; and after water is drained completely, a single drainage tank, which has a small volume, enters a water storage state with small air volume for balancing pressure, so the balancing time is reduced, the pressure drop fluctuation quantity is reduced and the molding and absorbing of paper pulp fibers are performed under a stable negative pressure.

Description

technical field [0001] The invention relates to the technical field of pulp molding equipment, in particular to a fully automatic pulp molding machine and an intermittent drainage vacuum device. Background technique [0002] At present, the equipment engaged in the production of pulp molded products mainly involves the following three sets of important devices: molding machine for product molding, drying and shaping machine, and intermittent drainage vacuum device. The above-mentioned traditional devices have the following deficiencies: (1) in the existing traditional pulp molded product forming machine, the drying cost of its product is a link that accounts for the largest proportion of production cost; however, the production of existing pulp molded products In terms of equipment, the most economical use of mechanical energy dehydration technology has not been applied to molding equipment. Therefore, in the production cost comparison of product inner packaging, the product...

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Problems solved by technology

The above-mentioned traditional devices have the following deficiencies: (1) in the existing traditional pulp molded product forming machine, the drying cost of its product is a link that accounts for the largest proportion of production cost; however, the production of existing pulp molded products In terms of equipment, the most economical use of mechanical energy dehydration technology has not been applied to molding equipment. Therefore, in the production cost comparison of product inner packaging, the production cost of paper-plastic fiber products and EPS products is 1. still relatively high

The link of high cost reflected in pulp fiber packaging products is mainly in the link of product drying, so that such renewable and recycled environmentally friendly material products lose their price competitiveness and cannot replace EPS material (non-degradable) packaging products in large quantities. Therefore, make full use of the dehydration process of mechanical energy and negative pressure to remove a large amount of moisture in the pulp molded products, to overcome the technical problems of high energy consumption drying, low production efficiency, people's labor intensity and high production cost in the prior art, This technical problem has been eager to be solved by the industry; (2) The most economical way to solve the drying of pulp molding is to make full use of mechanical energy and remove more water. Therefore, in the mechanism and process technology application of pulp fiber plastic forming machine A large number of analysis and research have been carried out in terms of conditions. The industry has always hoped to use the most economical fully automatic pulp molding machine with the integrated functions of fully dehydrating mechanical energy and thermal energy drying; (3) The traditional pulp molding products production equipment, Both adopt a single (storage) drainage tank structure and a vacuum device for intermittent drainage. During slurry suction molding, white water is sucked into the upper negative pressure storage tank connected to the vacuum pump through the pipeline, and the gas and water are separated, and the lower (storage) After the drainage tank is filled with white water, the connecting pipe of the two tanks is closed by the valve, and the white water in the drainage tank is drained (stored); The (storage) drainage tank is closed by a valve, therefore, the white water in the negative pressure storage tank occupies a certain volume, so that the gas storage volume of the negative pressure storage tank is continuously reduced. When the drainage tank has drained the white water, the two tanks connected The valve is opened, and the drainage tank is transferred to the state of water storage. It is necessary to quickly balance the pressure, so that the white water temporarily stored in the upper negative pressure storage tank flows into the lower (storage) drainage tank. At this time, the vacuum degree drops sharply, and the pressure The up and down fluctuations are relatively large; this periodical pressure fluctuates greatly, so that the forming and absorbing pulp fibers are carried out under unstable negative pressure conditions, and the weight of the product changes, which directly affects the quality of the product, or prolongs the forming time and consumes energy. (4) The vacuum device of the single (storage) drainage tank structure is to inhale the white water first in the upper negative pressure storage tank and then carry out the gas-water separation. There are unequal amounts of white water in the negative pressure pipeline connected with the negative pressure storage tank, which needs to be sucked into the negative pressure storage tank with negative pressure, and the negative pressure of the plastic forming mold in the molding machine is caused by the white water in the negative pressure tube. In order to ensure the interval effect, the vacuum negative pressure of the system will produce a certain pressure drop when it is input to the slurry suction molding mold. Therefore, in terms of vacuum pump power configuration, the power of the vacuum pump can only be increased to meet the production process conditions, which will consume more energy. , which increases the production cost

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