Paper pulp molding microwave drying forming equipment

Abstract

The invention discloses paper pulp molding microwave drying forming equipment, which relates to the technical field of molding preparation and comprises a plurality of core parts such as a lower shell, a pulp tank, a pulp suction system, a microwave drying system, a heat dissipation system, a hydraulic system and a vacuum suction dehydration / degassing system. Paper pulp in the paper pulp mold and the paper pulp in the paper pulp tank is adsorbed through the pulp suction system, wet ground paper is dried through the synergistic effect of the vacuum rotating funnel-shaped support and the microwave drying system, and meanwhile the mold is accurately positioned and pressed through the hydraulic system. The microwave drying system can quickly and uniformly heat paper pulp, and the problems of heat loss and non-uniform heating in a traditional drying mode are avoided. By means of the efficient and automatic system, the production efficiency of paper pulp molded products is remarkably improved, energy consumption is reduced, and the stability and consistency of finished products are guaranteed. The equipment is widely applicable to production of paper pulp molded products in the industries of packaging, electronics and the like.

Description

Technical Field

[0001] The invention relates to the technical field of molding preparation, in particular to pulp molding microwave drying and forming equipment. Background Art

[0002] As a new type of packaging material, pulp molded products are recognized by the world as pollution-free, technological, green and environmentally friendly packaging products with advantages such as environmental protection, biodegradability, lightweight, protective performance and customizability, and are rapidly developing in Europe and the United States. my country's pulp molding industry started late, and problems such as low automation, low product qualification rate and high energy consumption per unit product have restricted the further development of my country's pulp molding industry. Among them, dry-pressed paper and plastic products occupy a certain proportion in the pulp molding industry with their relatively simple production process and relatively low cost. However, due to the need for additional moistening and dehydration steps (that is, the theoretical energy consumption required for the dry pressing process to produce products of the same gram weight is higher), low product density and poor product appearance, it can only be used as a buffer packaging material with low market value. Therefore, reducing the production energy consumption of the pulp molding dry pressing process industry and increasing the market value of dry-pressed paper and plastic products are of great significance to the future development of the pulp molding dry pressing process industry.

[0003] Microwave heating is a heating method that relies on the object to absorb microwave energy and convert it into heat energy, so that the object can heat up as a whole at the same time, which is completely different from other conventional heating methods. Compared with traditional heating methods, it generates "internal friction heat" through the high-frequency reciprocating motion of the dipole molecules inside the heated body, which increases the temperature of the heated material without any heat conduction process. Therefore, it has the advantages of fast heating, uniform heating, instant heating, and safe heating. The wet pressing process of pulp molding refers to placing a pulp blank containing a high amount of water in a mold, dehydrating it under appropriate pressure and temperature conditions in the mold and forming a product of the desired shape. Therefore, the surface accuracy and density of the wet pressing product are relatively good, and it has a high market value. Therefore, combining the microwave heating method with the wet pressing process and introducing the dry pressing paper and plastic product production process can perfectly solve the complement of dry pressing paper and plastic products, and can produce a product with mechanical properties and appearance quality between dry pressing paper and plastic products and wet pressing paper and plastic products.

[0004] At present, microwave drying technology has been applied in some fields, but there is still a lot of room for improvement in its application in the pulp molding industry. Existing microwave drying equipment usually operates independently, separated from the molding system and dehydration system, resulting in inaccurate moisture control during the drying process. At the same time, the structure and working mode of traditional microwave drying equipment are relatively complex, lacking reasonable synergy between hot pressing and molding systems, and cannot achieve efficient and accurate production.

[0005] Therefore, the present invention provides a pulp molding microwave drying and forming device to solve one or more of the above problems. Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] In view of the deficiencies in the prior art, the present invention provides a pulp molding microwave drying and forming device to solve the problems raised in the above background technology.

[0008] (II) Technical solution

[0009] To achieve the above objectives, the present invention is implemented through the following technical scheme, including the lower shell of the equipment, the slurry tank, the unloading plate, the slurry suction system, the microwave drying system, the heat dissipation system, the upper shell of the molding equipment, the hydraulic system and the vacuum suction dehydration / degassing system which are sequentially arranged along the pulp molding dry pressing process.

[0010] Preferably, the lower shell body is connected to the upper shell body by several groups of rectangular pillars, a slurry tank is installed in the lower shell body, a support frame is fixedly connected to the outer wall of the lower shell body, the unloading plate is installed on the support frame by fastening screws, a heat dissipation system and a hydraulic system are installed in the upper shell body, the slurry tank is divided into a slurry pool and a reflux tank by a partition, several groups of air pipes are installed on the bottom of the inner wall of the slurry tank by U-shaped screws, and several groups of air holes are opened on the air pipes.

[0011] Preferably, a plurality of groups of long guide pillars are fixedly provided on the top of the lower shell body, and the lifting plate is slidably connected to the long guide pillars up and down, and the lifting plate is fixed to the hydraulic rod extension arm at the front position between the bearing bracket and the circular hole of the long guide pillar through the hydraulic rod extension arm fixing flange and fastening screws. The slurry suction mold, the slurry suction mold fixing plate and the bracket sealing plate in the slurry suction system are connected from top to bottom in sequence through screws and sealing rings, and are fixed to the upper and lower sides of the vacuum rotating "funnel-shaped" bracket.

[0012] Preferably, the protective isolation cover of the microwave drying system is a cast iron frame, and the interior of the frame is divided into several microwave emission systems by isolation plates, and several groups of placement antennas are arranged on the top cover surface of the protective isolation cover.

[0013] Preferably, the microwave transmitting system consists of six parts: a heat exchanger cooling water outlet pipe, a hot water inlet pipe, a heat exchanger, a filter power supply, a magnetron and an antenna. The heat exchanger is used to absorb the heat generated during the operation of the magnetron. The heat exchanger cooling water outlet pipe and the hot water inlet pipe provided on the side of the heat exchanger are used to realize the circulation of the cooling medium in the heat exchanger.

[0014] Preferably, a waveguide plate is provided between the protective isolation cover and the microwave hot pressing upper mold, a plurality of groups of rectangular microwave receiving holes are provided on the contact surface between the waveguide plate and the protective isolation cover, and a plurality of groups of rectangular microwave releasing holes are provided on the contact surface between the waveguide plate and the microwave hot pressing upper mold.

[0015] Preferably, the microwave hot pressing upper mold is composed of four parts: a front supporting shell, a core supporting shell, a rear supporting shell and a core. The front supporting shell and the rear supporting shell have the same structure. A guide column groove is provided in the center of the microwave hot pressing upper mold for installing the guide column. Penetrating screw grooves are provided on both sides of the guide column groove. The microwave hot pressing upper mold can be fixed to the waveguide plate by long screws. Four groups of waveguide channels are evenly distributed on the sides of the front supporting shell and the rear supporting shell, and circular microwave release holes of the waveguide plate are connected to the waveguide tube. Guide column grooves are provided in the center of the left and right side walls of the core supporting shell for installing the guide column, and penetrating screw grooves are provided on both sides of the guide column groove.

[0016] Preferably, the cold water tank and hot water tank of the heat dissipation system are cylindrical stainless steel tanks, and the cold water tank and the hot water tank are fixedly connected to the outer wall of the upper shell body, the cold water inlet pipe is connected to the water inlet valve of the cold water tank, the hot water outlet pipe is connected to the water outlet valve of the hot water tank, the circulating water pump is installed between the hot water outlet pipe and the hot water tank, and the water inlet and outlet are respectively provided on the left and right sides of the top of the radiator, and the radiator is connected in parallel with the cold water tank and the hot water tank through water pipes.

[0017] Preferably, the hydraulic support system of the hydraulic system is composed of two table-shaped metal supports, wherein the bottom of the "big table" support is connected to the upper shell of the forming equipment, and the top of the "big table" is used to support the "small table" support. There are two hydraulic cylinders, which are respectively arranged at the top center position of the "small table" support and the center position of the shell on the equipment. The hydraulic rod of the hydraulic cylinder at the top center position of the "small table" support is connected to the top of the liftable fixed plate, and four hydraulic rod extension arms extend outward from the four sides of the liftable fixed plate and are fastened through the hydraulic rod extension arm fixing flange. The hydraulic rod extension arm extends to the lifting plate of the slurry suction system and is used to realize the lifting and lowering of the entire slurry suction system. The hydraulic rod of the hydraulic cylinder at the center position of the shell on the equipment is also connected to the top of the liftable fixed plate, and the bottom of the liftable fixed plate is used to connect to the microwave drying system and is used to realize the lifting and lowering of the entire microwave drying system.

[0018] Preferably, the vacuum suction dehydration / degassing system is connected to the slurry suction system through a double-headed rotary joint, the front end of the double-headed rotary joint is connected to the hollow shaft of the slurry suction system by a fastening screw, and the end thereof is linked to two vacuum suction pipes and is connected to the dehydration / gas conversion box under the protection of the vacuum suction pipe protective shell. The dehydration / gas conversion box is a rectangular box with a partition inside. The back of the two chambers separated by the dehydration / gas conversion box is used to connect two vacuum suction pipes respectively, and the front thereof is welded with a vacuum suction exhaust gas U-shaped pipe with two sets of electromagnetic valves and a vacuum suction wastewater U-shaped pipe with two sets of electromagnetic valves. The two ends of the vacuum suction exhaust gas U-shaped pipe and the vacuum suction wastewater U-shaped pipe respectively pass through the two chambers separated by the dehydration / gas conversion box, and the ends thereof are provided with connecting pipes for connecting to vacuum tanks respectively.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. Improve production efficiency

[0021] Double-mold alternating operation: The equipment design includes two sets of slurry suction molds and a vacuum rotating "funnel-shaped" bracket, which can realize alternating wet blank forming and drying processes, avoiding the single mold operation bottleneck in traditional processes and greatly improving production efficiency.

[0022] Rapid drying: The microwave drying system can quickly dry the wet paper blank to the required moisture content, and through the penetrating characteristics of microwaves, ensure that the drying process is uniform and rapid, significantly shortening the drying time.

[0023] 2. Energy saving and environmental protection

[0024] Microwave heating technology: Microwave heating has a higher energy conversion efficiency and is more energy-efficient than traditional hot air drying. In addition, the microwave heating energy directly acts on the moisture in the pulp, reducing energy waste.

[0025] Circulating water cooling system: The heat dissipation system adopts the circulation method of cold water and hot water to effectively recover and utilize heat, reduce energy consumption, and meet the requirements of energy conservation and environmental protection.

[0026] 3. Precisely control humidity and pressure

[0027] Vacuum dehydration / degassing system: Through the vacuum suction process, the moisture content of the wet paper blank can be accurately controlled to ensure appropriate humidity during the forming process, which helps to improve the uniformity of the pulp and the quality of the final product.

[0028] The hydraulic system is linked with the microwave drying system: the hydraulic system can accurately control the pressure between the upper mold and the slurry suction mold, and cooperate with the hot pressing molding of the microwave drying system to ensure that the shaping process of the wet paper blank is stable and efficient.

[0029] 4. Improve product quality

[0030] Uniform drying and shaping: The metal cavity formed by the microwave hot pressing upper and lower molds can evenly heat the wet paper blank, reducing the risk of local overheating or insufficient drying, thereby improving the size and quality stability of the final product.

[0031] Multi-level moisture control: The coordinated operation of the vacuum dehydration / degassing system, microwave drying system and heat dissipation system in the equipment design helps to ensure uniform distribution of moisture during the pulp molding process, and the final product has higher drying uniformity and molding quality.

[0032] 5.Automation and intelligent operation

[0033] Automatic control system: The design of the whole set of equipment adopts highly integrated and automatic control such as hydraulic system, microwave system, vacuum suction system, etc., which reduces manual intervention and improves the stability and consistency of the production process.

[0034] Accurate temperature and humidity control: Through the precise control of the microwave drying system, the drying temperature and humidity can be accurately adjusted to ensure the stable quality of each batch of products and meet production requirements.

[0035] 6. Reduce labor intensity and operational risks

[0036] Automatic mold movement: The equipment adopts a hydraulic and microwave system linkage design, which can automatically adjust and move the mold, reducing the labor intensity of manual operation and reducing safety risks in operation.

[0037] Closed system design: The closed design of the vacuum dehydration system can effectively isolate water vapor and microwave radiation, reducing the harm to operators.

[0038] 7.Easy equipment maintenance

[0039] Modular design: Each system of the equipment, such as the microwave transmission system, hydraulic system and vacuum suction system, adopts modular design to facilitate inspection and maintenance, reducing production downtime caused by failures.

[0040] High reliability: Each system component has been precisely designed and tested to ensure high reliability and long life of the equipment, reducing equipment failure rate and maintenance costs.

[0041] 8. Closed loop of production process

[0042] Integration of production process: The high integration of slurry suction system, microwave drying system, hydraulic system and vacuum suction dehydration / degassing system realizes the fully automatic closed-loop control of the production process, from the input of slurry pool to the unloading of final product, ensuring the efficiency and stability of the whole process. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is the main view of the pulp molding microwave drying and forming equipment;

[0044] Figure 2 It is a perspective view of a slurry tank;

[0045] Figure 3 This is the main view of the pulp suction system of the pulp molding microwave drying and forming equipment;

[0046] Figure 4 This is the left view of the pulp suction system of the pulp molding microwave drying and forming equipment;

[0047] Figure 5This is a cross-sectional view of the pulp suction system of the pulp molding microwave drying and forming equipment;

[0048] Figure 6 This is the main view of the microwave drying system of the pulp molding microwave drying equipment;

[0049] Figure 7 Assembly drawing of microwave emission system for pulp molding microwave drying and forming equipment;

[0050] Figure 8 Microwave emission system parts diagram for pulp molding microwave drying equipment

[0051] Fig. 9 Waveguide plate parts diagram for pulp molding microwave drying equipment;

[0052] Fig.10 Microwave heating upper mold part 1 for pulp molding microwave drying;

[0053] Fig.11 Microwave heating upper mold part 2 for pulp molding microwave drying;

[0054] Fig.12 Microwave heat upper mold part three for pulp molding microwave drying;

[0055] Fig.13 Microwave heat upper mold part 4 for pulp molding microwave drying;

[0056] Fig.14 Microwave heat upper mold part 5 for pulp molding microwave drying;

[0057] Fig.15 This is the left view of the pulp molding microwave drying hydraulic system;

[0058] Fig.16 A top view of the heat dissipation system for microwave drying of pulp molding;

[0059] Fig.17 Left view of the vacuum suction dehydration / degassing system for pulp molding microwave drying;

[0060] Fig.18 Front view of the vacuum suction dehydration / degassing system for pulp molding microwave drying.

[0061] Figure: 1, lower shell; 2, slurry tank; 3, unloading board; 4, slurry suction system; 5, microwave drying system; 6, heat dissipation system; 7, upper shell of molding equipment; 8, hydraulic system; 9, rectangular support; 10, double-head rotary joint; 11, vacuum suction dehydration / degassing system; 12, reflux tank; 13, slurry pool; 14, fastening screws; 15, support frame; 16, air pipe; 17, long guide column; 18, lifting plate; 19, hydraulic rod extension arm; 20, vacuum Empty rotating "funnel-shaped" bracket; 21, slurry suction mold; 22, slurry suction mold fixing plate; 23, bracket sealing plate; 24, motor; 25, hydraulic rod extension arm fixing flange; 26, sleeve; 27, coupling; 28, solid shaft; 29, bearing bracket; 30, bearing; 31, hollow shaft; 32, steel pipe; 33, cylindrical hollow cavity; 34, semi-cylindrical header; 35, microwave hot pressing upper mold; 36, waveguide plate; 37, liftable fixing plate; 38, short Guide column; 39, hydraulic cylinder; 40, cooling water outlet pipe; 41, hot water inlet pipe; 42, protective isolation cover; 43, microwave emission system; 44, waveguide; 45, isolation plate; 46, heat exchanger; 47, magnetron; 48, filter power supply; 49, antenna; 50, rectangular microwave receiving hole; 51, circular microwave release hole; 52, rectangular microwave release hole; 53, mold core; 54, guide column groove; 55, screw groove; 56, front support shell; 57, mold core support shell body; 58, rear support shell; 59, transmission window; 60, hydraulic support system; 61, radiator; 62, water inlet; 63, water outlet; 64, cold water inlet pipe; 65, cold water tank; 66, hot water tank; 67, circulating water pump; 68, hot water outlet pipe; 69, vacuum suction pipe; 70, vacuum suction pipe protection shell; 71, joint conversion box; 72, vacuum suction exhaust U-tube; 73, electromagnetic valve; 74, joint pipe; 75, vacuum suction wastewater U-tube. DETAILED DESCRIPTION

[0062] In the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish the protective components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0063] like Figure 1-Figure 18As shown, a pulp molding microwave drying and forming equipment can be roughly divided into 9 parts according to the pulp molding dry pressing forming process: lower shell 1, slurry tank 2, unloading plate 3, slurry suction system 4, microwave drying system 5, heat dissipation system 6, forming equipment upper shell 7, hydraulic system 8 and vacuum suction dehydration / degassing system 11. Among them, the core structure is the slurry suction system 4, microwave drying system 5, heat dissipation system 6, hydraulic system 8 and vacuum suction dehydration / degassing system 11.

[0064] The slurry suction system 4 can mainly include a long guide column 17, a lifting plate 18, a hydraulic rod extension arm 19, a vacuum rotating "funnel-shaped" bracket 20, a slurry suction mold 21, a slurry suction mold fixing plate 22, a bracket sealing plate 23, a motor 24, a hydraulic rod extension arm fixing flange 25 and a sleeve 26 from bottom to top according to the installation method.

[0065] The microwave drying system 5 may mainly include a microwave hot pressing upper mold 35, a waveguide plate 36, a liftable fixing plate 37, a short guide column 38, a protective isolation cover 42 and a microwave emission system 43 in order from bottom to top according to the operation mode.

[0066] The heat dissipation system 6 mainly includes a cold water inlet pipe 64, a cooling water outlet pipe 40, a hot water outlet pipe 68, a hot water inlet pipe 41, a radiator 61, a cold water tank 65, a hot water tank 66 and a circulating water pump 67 in order from bottom to top according to the operation mode.

[0067] The hydraulic system 8 may mainly include a hydraulic cylinder 39 and a hydraulic support system 60 in order from bottom to top according to the operation mode.

[0068] The vacuum suction dehydration / degassing system 11 can mainly include a vacuum suction pipe 69, a vacuum suction pipe protection shell 70, a joint conversion box 71, a vacuum suction exhaust gas U-shaped pipe 72, an electromagnetic valve 73, a joint pipe 74, and a vacuum suction wastewater U-shaped pipe 75 from left to right according to the operating mode.

[0069] like Figure 2 As shown, the slurry tank 2 is provided with 4 partitions which are slightly narrower than the tank body and are connected to the tank bottom by welding, so that the entire slurry tank 2 is divided into two cavities, namely, the slurry tank 13 and the reflux tank 12. The reflux tank 12 in the slurry tank 2 is used for slurry recovery and circulation to ensure that the parameters such as slurry concentration and freeness are balanced. The side wall of the reflux tank 12 is provided with a reflux valve and an external reflux pipe leading to the slurry tank after the total knock. The slurry tank 13 in the slurry tank 2 is used to provide the raw material pulp required for the production of the pulp molding microwave drying molding equipment. The side wall of the slurry tank 13 is provided with a slurry inlet valve and a drain valve and connected to a pipeline for the supply and removal of slurry.

[0070] like Figure 3As shown, a large number of small holes with a diameter of 2 mm are opened on the horizontal surface of the air blast pipe 16 and are evenly distributed on the pipe surface. The size is slightly smaller than the bottom area of ​​the slurry pool and is fixed to the bottom of the pool by U-shaped screws. In the actual operation process, a large amount of air is instantly injected into the air blast pipe 16 and overflows from the small holes evenly distributed on the pipe surface into the slurry pool to cause the pulp to boil and promote the slurry to be evenly mixed, thereby ensuring the stability of the production of the pulp molding microwave drying and forming equipment.

[0071] like Figure 3-Figure 5 As shown, the slurry suction system 4 is provided with 4 long guide pillars 17 at the left and right edge positions between the lower shell 1 and the lower shell 7 and are respectively located at the 4 corners of the lower shell 1, the purpose of which is to limit the horizontal displacement of the lifting plate 18 under the action of the hydraulic system 8. The lifting plate 18 is a rectangular steel plate and there are two of them, which are respectively arranged on the left and right sides of the slurry suction system 4. A bearing bracket 29 is installed at the center of the lifting plate 18 through a fastening screw 14, and circular holes with a diameter close to that of the long guide pillar 17 are opened at the edges of both ends for accommodating the long guide pillar 17. Each lifting plate 18 is fixed with a hydraulic rod extension arm 19 at the front position between the bearing bracket 29 and the circular hole of the long guide pillar 17 through a hydraulic rod extension arm fixing flange 25 and a fastening screw 14, which can be used to realize the up and down movement of the lifting plate 18 in the height direction; a sleeve 26 is arranged at the bottom of the circular hole at the edge positions of the two ends through a fastening screw 14, which is used to ensure the stability of the lifting plate 18 during the up and down movement process on the long guide pillar 17.

[0072] like Figure 3-Figure 5 As shown, the slurry suction mold 21, the slurry suction mold fixing plate 22 and the bracket sealing plate 23 in the slurry suction system 4 are connected from top to bottom in sequence by screws and sealing rings, and are fixed to the upper and lower sides of the vacuum rotating "funnel-shaped" bracket 20. The vacuum rotating "funnel-shaped" bracket 20 can be regarded as composed of two identical regular triangular prism structure bottom combinations, one side of the regular triangular prism structure is connected to the bracket sealing plate 23, and the other two sides can be regarded as the support surface of the bracket sealing plate 23. The front center of the bracket sealing plate 23 is sunken inward by 10mm in a positive drafting manner, and is connected to a semi-cylindrical hollow cavity 33 provided on the back of the working surface. A semi-cylindrical header 34 is provided at the top of each regular triangular prism structure in the vacuum rotating "funnel-shaped" bracket 20, which is perpendicular to the bracket sealing plate 23. The side of the semi-cylindrical header 34 is tangent to the two supporting surfaces, and the semi-cylindrical header 34 of each regular triangular prism structure in the vacuum rotating "funnel-shaped" bracket 20 is welded on the flat side to form a whole cylinder. A semi-cylindrical hollow cavity 33 is provided on the back of the bracket sealing plate 23, and the semi-cylindrical header 34 tangent to the supporting surface is connected by steel pipes 32 distributed at equal intervals to form a vacuum channel, and supports the bracket sealing plate 23.

[0073] like Figure 3-Figure 5 As shown, the axis of the cylindrical manifold on both sides of the vacuum rotating "funnel-shaped" bracket 20 extends outwards to form a solid shaft 28 and a hollow shaft 31 for a certain distance, and is respectively connected to the bearings 30 in the bearing brackets 29 in the lifting plates 18 on the left and right sides of the lower shell 1. The hollow shaft 31 is connected to the vacuum suction dehydration / degassing system 11 to achieve the dehydration / degassing process of the entire pulp molding microwave drying and forming equipment. The solid shaft 28 is connected to the motor 24 through the coupling 27, which can be used to realize the flipping of the vacuum rotating "funnel-shaped" bracket 20, and the motor 24 is fixed to the extension plate of the lifting plate 18 by the fastening screws 14.

[0074] like Figure 6-Figure 8 As shown, the protective isolation cover 42 of the microwave drying system 5 is a cast iron frame, and a horizontally and vertically welded isolation plate 45 is arranged inside the frame to evenly divide the entire protective isolation cover 42 into 28 areas for independent and distributed installation of the microwave emission system 43. The isolation plate 45 can provide protective support when the protective isolation cover 42 is under pressure. The isolation plate 45 is evenly distributed with rectangular holes of the same size and specification to achieve interconnection between various areas, providing a channel for the later connection of circuits and pipelines in the microwave emission system 43. The top cover surface of the protective isolation cover 42 is evenly distributed with 28 circular microwave emission ports for accommodating antennas 49.

[0075] like Figure 7 and Figure 8 As shown, the microwave transmitting system 43 is mainly composed of six parts: a heat exchanger cooling water outlet pipe 40, a hot water inlet pipe 41, a heat exchanger 46, a filter power supply 48, a magnetron 47 and an antenna 49. The magnetron 47 is an electric vacuum device for generating microwave energy. Under the control of mutually perpendicular constant magnetic fields and constant electric fields, the electrons in the tube interact with the high-frequency electromagnetic field, and the energy in the constant electric field provided by the filter power supply 48 is converted into microwave energy, thereby achieving the purpose of generating microwave energy. The antenna 49 is a round tube, and its purpose is to prevent the magnetron 47 from being directly burned and causing equipment damage during high-energy microwave emission. The heat exchanger 46 is used to absorb the heat generated when the magnetron 47 is in operation, and the heat exchanger cooling water outlet pipe 40 and the hot water inlet pipe 41 provided on the side of the heat exchanger 46 are used to realize the circulation of the cooling medium in the heat exchanger.

[0076] like Fig. 9 and Fig.10As shown, the waveguide plate 36 is a rectangular aluminum plate, the front side of which contacts the cover surface of the protective isolation cover 42, and the back side contacts the bottom surface of the microwave hot pressing upper mold 35. The waveguide plate 36 is provided with 28 groups of waveguide channels for conducting microwaves, that is, the microwaves generated by the microwave transmitting system 43 are introduced into the microwave hot pressing upper mold 35 according to a certain route. 28 rectangular microwave receiving holes 50 are evenly distributed on the contact surface between the waveguide plate 36 and the protective isolation cover 42. 20 rectangular microwave release holes 52 are concentratedly provided at the corresponding positions of the contact surface between the waveguide plate 36 and the microwave hot pressing upper mold 35, and 4 circular microwave release holes 51 are respectively provided at the non-contact positions on both sides of the corresponding positions of the contact surface, a total of 28 holes for docking the microwave hot pressing upper mold 35. The microwave receiving holes and the microwave release holes in the waveguide plate 36 correspond to each other through the waveguide channels, thereby achieving the function of uniform and directional wave guiding.

[0077] like Figure 12-14 As shown, the microwave hot pressing upper mold 35 is mainly composed of four parts: a front support shell 56, a core support shell 57, a rear support shell 58 and a core 53. Among them, the materials of the front support shell 56, the core support shell 57 and the rear support shell 58 are aluminum 6061, and the main material of the core 53 is polytetrafluoroethylene. The front support shell 56 and the rear support shell 58 have the same structure and are similar to the traditional hot pressing upper mold structure. A guide column groove 54 is provided in the center of the support shell for installing the guide column, and screw grooves 55 are provided on both sides of the guide column groove 54. The microwave hot pressing upper mold 35 can be fixed to the waveguide plate 36 by long screws. There are 4 groups of waveguide channels equidistantly distributed on the sides of the front support shell 56 and the rear support shell 58, and the circular microwave release holes 51 connected to the waveguide plate 36 through the waveguide tube 44. This design can improve the uniformity of microwave distribution in the mold during drying. The sides of the front support shell 56 and the rear support shell 58 are each provided with 6 groups of threaded holes, and the side wall fastening screws 14 are installed to achieve the connection between the front support shell 56, the rear support shell 58 and the core support shell 57.

[0078] like Figure 12-14 As shown, the core support shell 56 is a rectangular trough structure, that is, it is composed of 4 side walls and 1 bottom plate. The left and right side walls of the core support shell 57 are similar to the front support shell 56 and the rear support shell 58, and are mainly used to position and fix the mold. That is, a guide column groove 54 is provided in the center of the left and right side walls for installing the guide column, and a through screw groove 55 is provided on both sides of the guide column groove 54, and the microwave hot pressing upper mold 35 can be fixed to the waveguide plate 36 by long screws. The front and rear side walls of the core support shell 57 are provided with a waveguide groove, and 4 transmission windows 59 are evenly distributed at the bottom of the waveguide groove, and the positions correspond to the 4 groups of waveguide channels in the front support shell 56 and the rear support shell 58. The bottom plate of the core support shell 57 is provided with 20 transmission windows 59, and the positions correspond to the 20 rectangular microwave release holes 52 provided in the middle of the waveguide plate 36.

[0079] like Figure 8 and Figure 8 As shown, the liftable fixing plate 37 is connected to the piston rod of the hydraulic cylinder 39 and four short guide pillars 38 of the hydraulic system 8 through a threaded flange and fastening screws. The microwave hot pressing upper mold 35, the waveguide plate 36, the protective isolation cover 42 and the microwave transmitting system 43 are sequentially installed on the liftable fixing plate 37 through screws. The piston rod of the hydraulic cylinder 39 is mainly used to realize the vertical movement of the components such as the microwave hot pressing upper mold 35, the waveguide plate 36, the protective isolation cover 42 and the microwave transmitting system 43, and the short guide pillars 38 are used to limit the horizontal displacement of the components such as the microwave hot pressing upper mold 35, the waveguide plate 36, the protective isolation cover 42 and the microwave transmitting system 43.

[0080] like Fig.16 As shown, the cold water tank 65 and the hot water tank 66 of the heat dissipation system 6 are cylindrical stainless steel tanks, and the bottom of the tank is provided with three feet for support and can be fixed by screws. A water inlet valve is provided at the top of the stainless steel tank, and a water outlet valve is provided at the bottom. The cold water tank 65 is fixed to the right rear side of the shell 7 on the molding equipment, and the hot water tank 66 is fixed to the front side of the shell 7 on the molding equipment. The cold water inlet pipe 64 is externally connected to the water inlet valve of the cold water tank 65. The hot water outlet pipe 68 is externally connected to the water outlet valve of the hot water tank 66, and the circulating water pump 67 is connected in series between the two. The radiator 61 is a water-cooled radiator, and there are a water inlet 62 and a water outlet 63 on the left and right sides of the top of the radiator respectively. The radiator 61 is connected in parallel with the cold water tank 65 and the hot water tank 66 through a water pipe.

[0081] like Fig.15 As shown, the hydraulic support system 60 of the hydraulic system 8 is mainly composed of two table-shaped metal supports, wherein the bottom of the "big table" support is connected to the upper shell 7 of the molding equipment, and the top of the "big table" is used to carry the "small table" support. There are two hydraulic cylinders 39, which are respectively placed at the center position of the top of the "small table" support and the center position of the upper shell 7 of the equipment. The hydraulic rod of the hydraulic cylinder 39 at the center position of the top of the "small table" support is connected to the top of the liftable fixed plate 37, and four hydraulic rod extension arms 19 extend outward from the four sides of the liftable fixed plate 37, and are fastened by the hydraulic rod extension arm fixing flange 25. The hydraulic rod extension arm 19 extends to the lifting plate 18 of the slurry suction system 4 and is used to realize the lifting and lowering of the entire slurry suction system 4. The hydraulic rod of the hydraulic cylinder 39 at the center position of the upper shell 7 of the equipment is also connected to the top of the liftable fixed plate 37, but the bottom of the liftable fixed plate 37 is used to connect the microwave drying system 5 and is used to realize the lifting and lowering of the entire microwave drying system 5.

[0082] like Fig.17 and Fig.18As shown, the vacuum suction dehydration / degassing system 11 is connected to the slurry suction system 4 through a double-headed rotary joint 10. The front end of the double-headed rotary joint 10 is connected to the hollow shaft 31 of the slurry suction system 4 through a fastening screw 14, and its end is connected to two vacuum suction pipes 69 and is connected to the dehydration / gas conversion box 71 under the protection of the vacuum suction pipe protection shell 70. The dehydration / gas conversion box 71 is a rectangular box with a partition inside. The back of the two chambers separated by the dehydration / gas conversion box 71 is used to connect two vacuum suction pipes 69 respectively, and the front is welded with a vacuum suction exhaust gas U-shaped pipe 72 with two sets of electromagnetic valves 73 and a vacuum suction waste water U-shaped pipe 75 with two sets of electromagnetic valves 73. The two ends of the vacuum suction exhaust gas U-shaped pipe 72 and the vacuum suction waste water U-shaped pipe 75 respectively penetrate the two chambers separated by the dehydration / gas conversion box 71, and the ends are provided with joint pipes 74 for connecting vacuum tanks respectively.

[0083] The working principle and beneficial effects of the above scheme are as follows: The working principle and beneficial effects of the above scheme are as follows: During actual operation, the slurry suction system consisting of a vacuum rotating "funnel-shaped" bracket, 2 sets of slurry suction molds, 2 sets of slurry suction mold fixing plates and 2 sets of bracket sealing plate assemblies is moved to the slurry tank, and the wet blank forming process is realized under the vacuum suction dehydration system.

[0084] The formed wet blank is reversed in direction by the motor reversal, and then the microwave drying system causes the hot upper mold to close the slurry absorption mold under the action of the hydraulic system, and the hot pressing forming process is realized under the vacuum suction degassing system. At this time, the other slurry absorption mold on the vacuum rotating "funnel-shaped" bracket is facing the slurry tank. Under the action of the hydraulic system, the slurry absorption system, the microwave drying system, and the vacuum suction dehydration / degassing system move to the slurry tank together, and the wet blank forming process of the slurry absorption mold is realized under the vacuum suction dehydration system, and it moves up to the initial position to maintain the vacuum suction dehydration process all the time, so as to reduce the drying process of the wet paper blank before closing the mold until the microwave drying is completed.

[0085] After the microwave drying system is finished, the vacuum rotating "funnel-shaped" support rotates 90 degrees clockwise, so that the dried paper blank product and the unloading plate are finally separated from the slurry absorption mold under the blowing force in the slurry absorption mold film and arrive at the unloading plate for collection. After the slurry absorption mold on the vacuum rotating "funnel-shaped" support is unloaded, the vacuum rotating "funnel-shaped" support rotates 90 degrees clockwise again for the next slurry absorption and microwave drying process to form a closed production loop.

[0086] During the actual operation of the microwave drying system, the microwave heating system is turned on during drying, and the microwaves generated by the microwave heating system enter the microwave metal cavity formed by the microwave hot pressing lower mold and the microwave hot pressing upper mold through the waveguide plate, waveguide channel, waveguide tube and transmission window, and dry and re-shape the initially shaped wet paper blank.

[0087] The water vapor generated during the molding process is discharged through the slurry suction mold, the slurry suction mold fixing plate, the bracket sealing plate, the vacuum rotating "funnel-shaped" bracket, and the double-head rotary joint under the action of vacuum suction force. At this time, the filter on the slurry suction mold is used as a microwave isolation to prevent microwave leakage.

[0088] During the actual operation of the heat dissipation system, the heat generated by the transformer and magnetron in the microwave heating system is absorbed by the cooling water in the heat exchanger. Subsequently, under the action of the circulating water pump, the cooling water in the heat exchanger passes through the hot water outlet pipe, hot water inlet pipe and hot water tank of the heat exchanger to reach the radiator for cooling. Then, under the action of the circulating water pump, the cooling water passes through the cold water tank, hot water outlet pipe and cold water inlet pipe to reach the heat exchanger to complete the heat dissipation cycle.

[0089] Among them, during the actual operation of the vacuum suction dehydration / degassing system, it mainly switches the two chambers of the dehydration / degassing conversion box between dehydration and degassing states through the switching of four electromagnetic valves, thereby ensuring that during the operation of the equipment, one slurry suction mold is dehydrating and slurry suction, and the other slurry suction mold is in the degassing and drying process.

[0090] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A pulp molding microwave drying and forming equipment, characterized in that: The invention comprises a lower shell (1) of the equipment, a slurry tank (2), a discharge plate (3), a slurry suction system (4), a microwave drying system (5), a heat dissipation system (6), an upper shell (7) of the molding equipment, a hydraulic system (8) and a vacuum suction dehydration / degassing system (11) which are arranged in sequence along the pulp molding dry pressing process.

2. The pulp molding microwave drying and forming equipment according to claim 1, characterized in that: The lower shell (1) and the upper shell (7) are connected by a plurality of groups of rectangular pillars (9); a slurry tank (2) is installed in the lower shell (1); a support frame (15) is fixedly connected to the outer wall of the lower shell (1); a discharge plate (3) is installed on the support frame (15) by means of fastening screws (14); a heat dissipation system (6) and a hydraulic system (8) are installed in the upper shell (7); a partition is used in the slurry tank (2) to divide the entire slurry tank (2) into a slurry pool (13) and a reflux tank (12); a plurality of groups of air blast pipes (16) are installed on the bottom of the inner wall of the slurry tank (2) by means of U-shaped screws; and a plurality of groups of air holes are provided on the air blast pipes (16).

3. The pulp molding microwave drying and forming equipment according to claim 1, characterized in that: A plurality of groups of long guide pillars (17) are fixedly provided on the top of the lower shell (1), and a lifting plate (18) is slidably connected to the long guide pillars (17) up and down, and the lifting plate (18) is fixed with a hydraulic rod extension arm (19) at a front position between a bearing bracket (29) and a circular hole of the long guide pillar (17) through a hydraulic rod extension arm fixing flange (25) and a fastening screw (14). A slurry suction mold (21), a slurry suction mold fixing plate (22) and a bracket sealing plate (23) in the slurry suction system (4) are connected in sequence from top to bottom through screws and sealing rings, and are fixed to the upper and lower sides of a vacuum rotating "funnel-shaped" bracket (20).

4. The pulp molding microwave drying and forming equipment according to claim 1, characterized in that: The protective isolation cover (42) of the microwave drying system (5) is a cast iron frame, and the interior of the frame is divided into a plurality of microwave emission systems (43) by an isolation plate (45). A plurality of groups of placement antennas (49) are arranged on the top cover surface of the protective isolation cover (42).

5. The pulp molding microwave drying and forming equipment according to claim 4, characterized in that: The microwave transmitting system (43) is composed of six parts: a heat exchanger cooling water outlet pipe (40), a hot water inlet pipe (41), a heat exchanger (46), a filter power supply (48), a magnetron (47) and an antenna (49). The heat exchanger (46) is used to absorb the heat generated when the magnetron (47) is in operation. The heat exchanger cooling water outlet pipe (40) and the hot water inlet pipe (41) provided on the side of the heat exchanger (46) are used to realize the circulation of the cooling medium in the heat exchanger.

6. The pulp molding microwave drying and forming equipment according to claim 5, characterized in that: A waveguide plate (36) is provided between the protective isolation cover (42) and the microwave hot pressing upper mold (35); a plurality of groups of rectangular microwave receiving holes (50) are provided on the contact surface between the waveguide plate (36) and the protective isolation cover (42); and a plurality of groups of rectangular microwave releasing holes (52) are provided on the contact surface between the waveguide plate (36) and the microwave hot pressing upper mold (35).

7. The pulp molding microwave drying and forming equipment according to claim 6, characterized in that: The microwave hot pressing upper mold (35) is composed of four parts, namely a front supporting shell (56), a core supporting shell (57), a rear supporting shell (58) and a core (53). The front supporting shell (56) and the rear supporting shell (58) have the same structure. A guide column groove (54) is provided at the center of the microwave hot pressing upper mold (35) for installing a guide column. Screw grooves (55) are provided on both sides of the guide column groove (54). The microwave hot pressing upper mold (35) can be fixed to the waveguide plate (36) by long screws. Four groups of waveguide channels are evenly distributed on the sides of the front supporting shell (56) and the rear supporting shell (58) and are connected to the circular microwave release hole (51) of the waveguide plate (36) through a waveguide tube (44). Guide column grooves (54) are provided at the center of the left and right side walls of the core supporting shell (56) for installing a guide column. Screw grooves (55) are provided on both sides of the guide column groove (54).

8. The pulp molding microwave drying and forming equipment according to claim 1, characterized in that: The cold water tank (65) and the hot water tank (66) of the heat dissipation system (6) are cylindrical stainless steel tanks, and the cold water tank (65) and the hot water tank (66) are fixedly connected to the outer wall of the upper shell (7), the cold water inlet pipe (64) is connected to the water inlet valve of the cold water tank (65), the hot water outlet pipe (68) is connected to the water outlet valve of the hot water tank (66), the circulating water pump (67) is installed between the hot water outlet pipe (68) and the hot water tank (66), the left and right sides of the top of the radiator (61) are respectively provided with a water inlet (62) and a water outlet (63), and the radiator (61) is connected in parallel with the cold water tank (65) and the hot water tank (66) through water pipes.

9. The pulp molding microwave drying and forming equipment according to claim 1, characterized in that: The hydraulic support system (60) of the hydraulic system (8) is composed of two table-shaped metal supports, wherein the bottom of the "large table" support is connected to the upper shell (7) of the molding device, and the top of the "large table" is used to support the "small table" support. There are two hydraulic cylinders (39), which are respectively arranged at the center position of the top of the "small table" support and the center position of the upper shell (7) of the device. The hydraulic rod of the hydraulic cylinder (39) at the center position of the top of the "small table" support is connected to the top of the liftable fixed plate (37), and the four sides of the liftable fixed plate (37) extend outward. Four hydraulic rod extension arms (19) are fastened and connected via hydraulic rod extension arm fixing flanges (25). The hydraulic rod extension arms (19) extend to the lifting plate (18) of the slurry suction system (4) and are used to realize the lifting and lowering of the entire slurry suction system (4). The hydraulic rod of the hydraulic cylinder (39) at the center position of the equipment upper shell (7) is also connected to the top of the liftable fixing plate (37). The bottom of the liftable fixing plate (37) is used to connect to the microwave drying system (5) and is used to realize the lifting and lowering of the entire microwave drying system (5).

10. The pulp molding microwave drying and forming equipment according to claim 1, characterized in that: The vacuum suction dehydration / degassing system (11) is connected to the slurry suction system (4) via a double-headed rotary joint (10). The front end of the double-headed rotary joint (10) is connected to the hollow shaft (31) of the slurry suction system (4) via a fastening screw (14). The end of the double-headed rotary joint (10) is connected to two vacuum suction pipes (69) and is connected to a dehydration / gas conversion box (71) under the protection of a vacuum suction pipe protection shell (70). The dehydration / gas conversion box (71) is a rectangular box with a partition inside. The back of the two chambers separated by the dehydration / gas conversion box (71) is used to connect two vacuum suction pipes (69) respectively, and the front is welded with a vacuum suction exhaust gas U-shaped pipe (72) with two sets of electromagnetic valves (73) and a vacuum suction waste water U-shaped pipe (75) with two sets of electromagnetic valves (73). The two ends of the vacuum suction exhaust gas U-shaped pipe (72) and the vacuum suction waste water U-shaped pipe (75) respectively penetrate the two chambers separated by the dehydration / gas conversion box (71), and the ends are provided with joint pipes (74) for connecting to vacuum tanks respectively.

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